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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1709.01266 | Thomas Hahn | C. Bogner, S. Borowka, T. Hahn, G. Heinrich, S.P. Jones, M. Kerner, A.
von Manteuffel, M. Michel, E. Panzer, V. Papara | Loopedia, a Database for Loop Integrals | 16 pages, lots of screenshots | null | 10.1016/j.cpc.2017.12.017 | CERN-TH-2017-175, CP3-17-26, MaPhy-AvH/2017-07, MSUHEP-17-013,
MPP-2017-173 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loopedia is a new database at loopedia.org for information on Feynman
integrals, intended to provide both bibliographic information as well as
results made available by the community. Its bibliometry is complementary to
that of SPIRES or arXiv in the sense that it admits searching for integrals by
graph-theoretical objects, e.g. its topology.
| [
{
"created": "Tue, 5 Sep 2017 07:33:08 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Bogner",
"C.",
""
],
[
"Borowka",
"S.",
""
],
[
"Hahn",
"T.",
""
],
[
"Heinrich",
"G.",
""
],
[
"Jones",
"S. P.",
""
],
[
"Kerner",
"M.",
""
],
[
"von Manteuffel",
"A.",
""
],
[
"Michel",
"M.",... | Loopedia is a new database at loopedia.org for information on Feynman integrals, intended to provide both bibliographic information as well as results made available by the community. Its bibliometry is complementary to that of SPIRES or arXiv in the sense that it admits searching for integrals by graph-theoretical objects, e.g. its topology. |
1403.6118 | Matthew Baumgart | Matthew Baumgart, Daniel Stolarski and Thomas Zorawski | Split SUSY Radiates Flavor | 55 pages, 14 figures. v2: Typos fixed and references added. v3: More
typos fixed and figure corrected | Phys. Rev. D 90, 055001 (2014) | 10.1103/PhysRevD.90.055001 | CERN-PH-TH/2014-047 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative flavor models where the hierarchies of Standard Model (SM) fermion
masses and mixings are explained via loop corrections are elegant ways to solve
the SM flavor puzzle. Here we build such a model in the context of Mini-Split
Supersymmetry (SUSY) where both flavor and SUSY breaking occur at a scale of
1000 TeV. This model is consistent with the observed Higgs mass, unification,
and WIMP dark matter. The high scale allows large flavor mixing among the
sfermions, which provides part of the mechanism for radiative flavor
generation. In the deep UV, all flavors are treated democratically, but at the
SUSY breaking scale, the third, second, and first generation Yukawa couplings
are generated at tree level, one loop, and two loops, respectively. Save for
one, all the dimensionless parameters in the theory are O(1), with the
exception being a modest and technically natural tuning that explains both the
smallness of the bottom Yukawa coupling and the largeness of the Cabibbo angle.
| [
{
"created": "Mon, 24 Mar 2014 20:00:04 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2014 04:06:31 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Sep 2014 18:42:36 GMT",
"version": "v3"
}
] | 2014-09-22 | [
[
"Baumgart",
"Matthew",
""
],
[
"Stolarski",
"Daniel",
""
],
[
"Zorawski",
"Thomas",
""
]
] | Radiative flavor models where the hierarchies of Standard Model (SM) fermion masses and mixings are explained via loop corrections are elegant ways to solve the SM flavor puzzle. Here we build such a model in the context of Mini-Split Supersymmetry (SUSY) where both flavor and SUSY breaking occur at a scale of 1000 TeV. This model is consistent with the observed Higgs mass, unification, and WIMP dark matter. The high scale allows large flavor mixing among the sfermions, which provides part of the mechanism for radiative flavor generation. In the deep UV, all flavors are treated democratically, but at the SUSY breaking scale, the third, second, and first generation Yukawa couplings are generated at tree level, one loop, and two loops, respectively. Save for one, all the dimensionless parameters in the theory are O(1), with the exception being a modest and technically natural tuning that explains both the smallness of the bottom Yukawa coupling and the largeness of the Cabibbo angle. |
hep-ph/9702436 | Eugenii Akhmedov | E. Kh. Akhmedov, A. Lanza and D. W. Sciama | Resonant spin-flavour precession of neutrinos and pulsar velocities | 16 pages, LaTex. Corrected calculation of the geometrical factor and
temperature derivatives of densities. Final results slightly changed.
Replaced to match the published version | Phys.Rev.D56:6117-6124,1997 | 10.1103/PhysRevD.56.6117 | SISSA 27/97/A-EP | hep-ph astro-ph | null | Young pulsars are known to exhibit large space velocities, up to $10^3$ km/s.
We propose a new mechanism for the generation of these large velocities based
on an asymmetric emission of neutrinos during the supernova explosion. The
mechanism involves the resonant spin-flavour precession of neutrinos with a
transition magnetic moment in the magnetic field of the supernova. The
asymmetric emission of neutrinos is due to the distortion of the resonance
surface by matter polarisation effects in the supernova magnetic field. The
requisite values of the field strengths and neutrino parameters are estimated
for various neutrino conversions caused by their Dirac or Majorana-type
transition magnetic moments.
| [
{
"created": "Thu, 27 Feb 1997 16:58:23 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Mar 1998 18:44:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Akhmedov",
"E. Kh.",
""
],
[
"Lanza",
"A.",
""
],
[
"Sciama",
"D. W.",
""
]
] | Young pulsars are known to exhibit large space velocities, up to $10^3$ km/s. We propose a new mechanism for the generation of these large velocities based on an asymmetric emission of neutrinos during the supernova explosion. The mechanism involves the resonant spin-flavour precession of neutrinos with a transition magnetic moment in the magnetic field of the supernova. The asymmetric emission of neutrinos is due to the distortion of the resonance surface by matter polarisation effects in the supernova magnetic field. The requisite values of the field strengths and neutrino parameters are estimated for various neutrino conversions caused by their Dirac or Majorana-type transition magnetic moments. |
1308.1825 | Alfonso Zerwekh | Oscar Castillo-Felisola, Cristobal Corral, Marcela Gonzalez, Gaston
Moreno, Nicolas A. Neill, Felipe Rojas, Jilberto Zamora and Alfonso R.
Zerwekh | Higgs Boson Phenomenology in a Simple Model with Vector Resonances | null | Eur. Phys. J. C (2013) 73:2669 | 10.1140/epjc/s10052-013-2669-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider a simple scenario where the Higgs boson and two
vector resonances are supposed to arise from a new strong interacting sector.
We use the ATLAS measurements of the dijet spectrum to set limits on the masses
of the resonances. Additionally we compute the Higgs boson decay to two photons
and found, when compare to the Standard Model prediction, a small excess which
is compatible with ATLAS measurements. Finally we make prediction for
Higgs-strahlung processes for the LHC running at 14 TeV.
| [
{
"created": "Thu, 8 Aug 2013 12:24:31 GMT",
"version": "v1"
}
] | 2014-06-23 | [
[
"Castillo-Felisola",
"Oscar",
""
],
[
"Corral",
"Cristobal",
""
],
[
"Gonzalez",
"Marcela",
""
],
[
"Moreno",
"Gaston",
""
],
[
"Neill",
"Nicolas A.",
""
],
[
"Rojas",
"Felipe",
""
],
[
"Zamora",
"Jilberto",
... | In this paper we consider a simple scenario where the Higgs boson and two vector resonances are supposed to arise from a new strong interacting sector. We use the ATLAS measurements of the dijet spectrum to set limits on the masses of the resonances. Additionally we compute the Higgs boson decay to two photons and found, when compare to the Standard Model prediction, a small excess which is compatible with ATLAS measurements. Finally we make prediction for Higgs-strahlung processes for the LHC running at 14 TeV. |
hep-ph/0605217 | Andreas Hocker | Andreas Hocker (CERN) and Zoltan Ligeti (LBNL & MIT) | CP violation and the CKM matrix | 61 pages, 11 figures; review article to be published in Ann. Rev. of
Nucl. and Part. Science | Ann.Rev.Nucl.Part.Sci.56:501-567,2006 | 10.1146/annurev.nucl.56.080805.140456 | CERN-PH-EP/2006-007, LBNL-59882, MIT-CTP 3729 | hep-ph | null | Our knowledge of quark-flavor physics and CP violation increased tremendously
over the past five years. It is confirmed that the Standard Model correctly
describes the dominant parts of the observed CP-violating and flavor-changing
phenomena. Not only does CP violation provide some of the most precise
constraints on the flavor sector, but several measurements performed at the
B-factories achieved much better precision than had been expected. We review
the present status of the Cabibbo-Kobayashi-Maskawa matrix and CP violation,
recollect the relevant experimental and theoretical inputs, display the results
from the global CKM fit, and discuss their implications for the Standard Model
and some of its extensions.
| [
{
"created": "Mon, 22 May 2006 11:10:11 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jun 2006 22:11:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hocker",
"Andreas",
"",
"CERN"
],
[
"Ligeti",
"Zoltan",
"",
"LBNL & MIT"
]
] | Our knowledge of quark-flavor physics and CP violation increased tremendously over the past five years. It is confirmed that the Standard Model correctly describes the dominant parts of the observed CP-violating and flavor-changing phenomena. Not only does CP violation provide some of the most precise constraints on the flavor sector, but several measurements performed at the B-factories achieved much better precision than had been expected. We review the present status of the Cabibbo-Kobayashi-Maskawa matrix and CP violation, recollect the relevant experimental and theoretical inputs, display the results from the global CKM fit, and discuss their implications for the Standard Model and some of its extensions. |
1109.3127 | Xing-Gang Wu | Tao Zhong, Xing-Gang Wu, Hua-Yong Han, Qi-Li Liao, Hai-Bing Fu and
Zhen-Yun Fang | Revisiting the Twist-3 Distribution Amplitudes of $K$ Meson within the
QCD Background Field Approach | 11 pages, 3 figures. To match the printed version. To be published in
Communications in Theoretical Physics | Commun. Theor. Phys. 58, 261-270 (2012) | 10.1088/0253-6102/58/2/16 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper, we investigate the kaon twist-3 distribution amplitudes
(DAs) $\phi_{p,\sigma}^K$ within the QCD background field approach. The
$SU_f(3)$-breaking effects are studied in detail under a systematical way,
especially the sum rules for the moments of $\phi_{p,\sigma}^K$ are obtained by
keeping all the mass terms in the $s$-quark propagator consistently. After
adding all the uncertainties in quadrature, the first two Gegenbauler moments
of $\phi_{p,\sigma}^K$ are $a^1_{K,p}(1 {\rm GeV}) = -0.376^{+0.103}_{-0.148}$,
$a^2_{K,p}(1 {\rm GeV}) = 0.701^{+0.481}_{-0.491}$, $a^1_{K,\sigma}(1 {\rm
GeV}) = -0.160^{+0.051}_{-0.074}$ and $a^2_{K,\sigma}(1 {\rm GeV}) =
0.369^{+0.163}_{-0.149}$, respectively. Their normalization parameters $\mu_K^p
|_{1\rm GeV} = 1.188^{+0.039}_{-0.043}$ GeV and $\mu_K^\sigma |_{1\rm GeV} =
1.021^{+0.036}_{-0.055}$ GeV. A detailed discussion on the properties of
$\phi^K_{p,\sigma}$ moments shows that the higher-order $s$-quark mass terms
can indeed provide sizable contributions. Furthermore, based on the newly
obtained moments, a model for the kaon twist-3 wavefunction
$\Psi_{p,\sigma}^K(x,\mathbf{k}_\perp)$ with a better end-point behavior is
constructed, which shall be useful for perturbative QCD calculations. As a
byproduct, we make a discussion on the properties of the pion twist-3 DAs.
| [
{
"created": "Wed, 14 Sep 2011 16:28:21 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2011 18:09:14 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Jun 2012 18:28:55 GMT",
"version": "v3"
}
] | 2015-05-30 | [
[
"Zhong",
"Tao",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Han",
"Hua-Yong",
""
],
[
"Liao",
"Qi-Li",
""
],
[
"Fu",
"Hai-Bing",
""
],
[
"Fang",
"Zhen-Yun",
""
]
] | In the present paper, we investigate the kaon twist-3 distribution amplitudes (DAs) $\phi_{p,\sigma}^K$ within the QCD background field approach. The $SU_f(3)$-breaking effects are studied in detail under a systematical way, especially the sum rules for the moments of $\phi_{p,\sigma}^K$ are obtained by keeping all the mass terms in the $s$-quark propagator consistently. After adding all the uncertainties in quadrature, the first two Gegenbauler moments of $\phi_{p,\sigma}^K$ are $a^1_{K,p}(1 {\rm GeV}) = -0.376^{+0.103}_{-0.148}$, $a^2_{K,p}(1 {\rm GeV}) = 0.701^{+0.481}_{-0.491}$, $a^1_{K,\sigma}(1 {\rm GeV}) = -0.160^{+0.051}_{-0.074}$ and $a^2_{K,\sigma}(1 {\rm GeV}) = 0.369^{+0.163}_{-0.149}$, respectively. Their normalization parameters $\mu_K^p |_{1\rm GeV} = 1.188^{+0.039}_{-0.043}$ GeV and $\mu_K^\sigma |_{1\rm GeV} = 1.021^{+0.036}_{-0.055}$ GeV. A detailed discussion on the properties of $\phi^K_{p,\sigma}$ moments shows that the higher-order $s$-quark mass terms can indeed provide sizable contributions. Furthermore, based on the newly obtained moments, a model for the kaon twist-3 wavefunction $\Psi_{p,\sigma}^K(x,\mathbf{k}_\perp)$ with a better end-point behavior is constructed, which shall be useful for perturbative QCD calculations. As a byproduct, we make a discussion on the properties of the pion twist-3 DAs. |
1312.4759 | Lei Wang | Lei Wang, Xiao-Fang Han | Status of the aligned two-Higgs-doublet model confronted with the Higgs
data | 21 pages, 9 figures and 3 tables. Final version appeared in JHEP | JHEP04, 128 (2014) | 10.1007/JHEP04(2014)128 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Imposing the theoretical constraints from vacuum stability, unitarity and
perturbativity as well as the experimental constraints from the electroweak
precision data, flavor observables and the non-observation of additional Higgs
at collider, we study the implications of available Higgs signals on a
two-Higgs-doublet model with the alignment of the down-type quarks and charged
lepton Yukawa coupling matrices. Compared to the four traditional types of
two-Higgs-doublet models, the model has two additional mixing angles $\theta_d$
and $\theta_l$ in the down-type quark and charged lepton Yukawa interactions.
We find that the mixing angle $\theta_d$ can loose the constraints on
$sin(\beta-\alpha)$, $tan\beta$ and $m_{H^{\pm}}$ sizably. The model can
provide the marginally better fit to available Higgs signals data than SM,
which requires the Higgs couplings with gauge bosons, $u\bar{u}$ and $d\bar{d}$
to be properly suppressed, and favors (1 <\theta_d< 2, 0.5 <\theta_l< 2.2) for
$m_h=$ 125.5 GeV and (0.5 <\theta_d< 2, 0.5 <\theta_l< 2.2) for $m_H=$ 125.5
GeV. However, these Higgs couplings are allowed to have sizable deviations from
SM for ($m_h=$ 125.5 GeV, 125.5 $\leq m_H\leq$ 128 GeV) and (125 GeV $\leq
m_h\leq$ 125.5 GeV, $m_H=$ 125.5 GeV).
| [
{
"created": "Tue, 17 Dec 2013 13:01:43 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Apr 2014 16:17:52 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Apr 2014 15:15:44 GMT",
"version": "v3"
}
] | 2015-06-18 | [
[
"Wang",
"Lei",
""
],
[
"Han",
"Xiao-Fang",
""
]
] | Imposing the theoretical constraints from vacuum stability, unitarity and perturbativity as well as the experimental constraints from the electroweak precision data, flavor observables and the non-observation of additional Higgs at collider, we study the implications of available Higgs signals on a two-Higgs-doublet model with the alignment of the down-type quarks and charged lepton Yukawa coupling matrices. Compared to the four traditional types of two-Higgs-doublet models, the model has two additional mixing angles $\theta_d$ and $\theta_l$ in the down-type quark and charged lepton Yukawa interactions. We find that the mixing angle $\theta_d$ can loose the constraints on $sin(\beta-\alpha)$, $tan\beta$ and $m_{H^{\pm}}$ sizably. The model can provide the marginally better fit to available Higgs signals data than SM, which requires the Higgs couplings with gauge bosons, $u\bar{u}$ and $d\bar{d}$ to be properly suppressed, and favors (1 <\theta_d< 2, 0.5 <\theta_l< 2.2) for $m_h=$ 125.5 GeV and (0.5 <\theta_d< 2, 0.5 <\theta_l< 2.2) for $m_H=$ 125.5 GeV. However, these Higgs couplings are allowed to have sizable deviations from SM for ($m_h=$ 125.5 GeV, 125.5 $\leq m_H\leq$ 128 GeV) and (125 GeV $\leq m_h\leq$ 125.5 GeV, $m_H=$ 125.5 GeV). |
2105.02505 | Guy Chanfray | Guy Chanfray and Magda Ericson | Gamma production in neutrino interaction with nuclei | 9 pages, 4 figures | Phys. Rev. C 104, 015203 (2021) | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We evaluate the cross-section for gamma production by neutrinos through a
meson exchange effect which derives from the concept of axial-vector mixing.
The resulting cross-section leads to some increase of the gamma production
cross-section by neutrinos, especially at low neutrino energies, which may
influence the understanding of the low energy excess of electron-like events
seen in the MiniBooNE experiment.
| [
{
"created": "Thu, 6 May 2021 08:09:14 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Aug 2021 16:19:50 GMT",
"version": "v2"
}
] | 2021-08-11 | [
[
"Chanfray",
"Guy",
""
],
[
"Ericson",
"Magda",
""
]
] | We evaluate the cross-section for gamma production by neutrinos through a meson exchange effect which derives from the concept of axial-vector mixing. The resulting cross-section leads to some increase of the gamma production cross-section by neutrinos, especially at low neutrino energies, which may influence the understanding of the low energy excess of electron-like events seen in the MiniBooNE experiment. |
0910.4239 | Altug Ozpineci | T. M. Aliev, A. Ozpineci, V. S. Zamiralov | On Mass Formulas for Charm and Beauty Baryons | 10 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Possible mixing and its consequences of heavy cascade baryons \Xi-\Xi^\prime
is analyzed and its importance in the analysis of their characteristics is
shown within the non-relativistic quark model and QCD sum rules.
| [
{
"created": "Thu, 22 Oct 2009 07:06:56 GMT",
"version": "v1"
}
] | 2009-10-23 | [
[
"Aliev",
"T. M.",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Zamiralov",
"V. S.",
""
]
] | Possible mixing and its consequences of heavy cascade baryons \Xi-\Xi^\prime is analyzed and its importance in the analysis of their characteristics is shown within the non-relativistic quark model and QCD sum rules. |
2404.06577 | Vishnudath K. N. | Carolina Arbel\'aez, A.E. C\'arcamo Hern\'andez, Claudio Dib, Patricio
Escalona Contreras, Vishnudath K. N., and Alfonso Zerwekh | A common framework for fermion mass hierarchy, leptogenesis and dark
matter | 22 pages, 11 captioned figures, corrected typos | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we explore an extension of the Standard Model designed to
elucidate the fermion mass hierarchy, account for the dark matter relic
abundance, and explain the observed matter-antimatter asymmetry in the
universe. Beyond the Standard Model particle content, our model introduces
additional scalars and fermions. Notably, the light active neutrinos and the
first two generations of charged fermions acquire masses at the one-loop level.
The model accommodates successful low-scale leptogenesis, permitting the mass
of the decaying heavy right-handed neutrino to be as low as 10 TeV. We conduct
a detailed analysis of the dark matter phenomenology and explore various
interesting phenomenological implications. These include charged lepton flavor
violation, muon and electron anomalous magnetic moments, constraints arising
from electroweak precision observables, and implications for collider
experiments.
| [
{
"created": "Tue, 9 Apr 2024 18:55:35 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Apr 2024 19:03:01 GMT",
"version": "v2"
}
] | 2024-04-17 | [
[
"Arbeláez",
"Carolina",
""
],
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Dib",
"Claudio",
""
],
[
"Contreras",
"Patricio Escalona",
""
],
[
"N.",
"Vishnudath K.",
""
],
[
"Zerwekh",
"Alfonso",
""
]
] | In this work, we explore an extension of the Standard Model designed to elucidate the fermion mass hierarchy, account for the dark matter relic abundance, and explain the observed matter-antimatter asymmetry in the universe. Beyond the Standard Model particle content, our model introduces additional scalars and fermions. Notably, the light active neutrinos and the first two generations of charged fermions acquire masses at the one-loop level. The model accommodates successful low-scale leptogenesis, permitting the mass of the decaying heavy right-handed neutrino to be as low as 10 TeV. We conduct a detailed analysis of the dark matter phenomenology and explore various interesting phenomenological implications. These include charged lepton flavor violation, muon and electron anomalous magnetic moments, constraints arising from electroweak precision observables, and implications for collider experiments. |
hep-ph/0104230 | Joanne Gillett | V.A. Khoze (Durham), A.D. Martin (Durham), M.G. Ryskin (St.
Petersburg) | High p_T Higgs signal for the LHC | 9 pages, 3 figures, Latex | Eur.Phys.J.C21:99-103,2001 | 10.1007/s100520100719 | IPPP/01/16, DCPT/01/32 | hep-ph | null | We show that the broad transverse momentum distribution of the Higgs boson
produced by WW fusion can provide a viable way to identify H --> b anti-b
decays at the LHC, if particular kinematical configurations with large rapidity
gaps are selected. We estimate the event rate of the signal and of the QCD b
anti-b background. We also discuss Higgs boson detection via the H --> tau tau
and H --> WW* decay modes.
| [
{
"created": "Mon, 23 Apr 2001 13:39:03 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Khoze",
"V. A.",
"",
"Durham"
],
[
"Martin",
"A. D.",
"",
"Durham"
],
[
"Ryskin",
"M. G.",
"",
"St.\n Petersburg"
]
] | We show that the broad transverse momentum distribution of the Higgs boson produced by WW fusion can provide a viable way to identify H --> b anti-b decays at the LHC, if particular kinematical configurations with large rapidity gaps are selected. We estimate the event rate of the signal and of the QCD b anti-b background. We also discuss Higgs boson detection via the H --> tau tau and H --> WW* decay modes. |
1909.04229 | Ayuki Kamada | Ayuki Kamada, Takumi Kuwahara | Lessons from $T^{\mu}_{~ \mu}$ on inflation models: two-loop
renormalization of $\eta$ in the scalar QED | 11+28 pages, 10 figures; massive revision, calculation corrected,
conclusion changed | Phys. Rev. D 103, 116001 (2021) | 10.1103/PhysRevD.103.116001 | CTPU-PTC-19-25 | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A non-minimal coupling $\eta$ has been attracting growing interest
particularly in the context of inflation models, though its quantum nature is
not clear yet. We study the renormalization of a non-minimal coupling in the
scalar quantum electrodynamics (QED). We find ${\it no}$ inhomogeneous term of
the renormalization group equation (RGE) at the two-loop level. This is similar
to other theories, where an inhomogeneous term of the RGE appears only at a
higher-loop order: e.g., four-loop order in $\lambda \phi^{4}$ theory.
| [
{
"created": "Tue, 10 Sep 2019 01:37:25 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2020 04:08:14 GMT",
"version": "v2"
}
] | 2021-06-09 | [
[
"Kamada",
"Ayuki",
""
],
[
"Kuwahara",
"Takumi",
""
]
] | A non-minimal coupling $\eta$ has been attracting growing interest particularly in the context of inflation models, though its quantum nature is not clear yet. We study the renormalization of a non-minimal coupling in the scalar quantum electrodynamics (QED). We find ${\it no}$ inhomogeneous term of the renormalization group equation (RGE) at the two-loop level. This is similar to other theories, where an inhomogeneous term of the RGE appears only at a higher-loop order: e.g., four-loop order in $\lambda \phi^{4}$ theory. |
2101.06785 | Carlo Giunti Dr. | C. Giunti, Y.F. Li, C.A. Ternes, Y.Y. Zhang | Neutrino-4 anomaly: oscillations or fluctuations? | 12 pages. Final version to be published in Physics Letters B | null | 10.1016/j.physletb.2021.136214 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a deep study of the Neutrino-4 data aimed at finding the
statistical significance of the large-mixing short-baseline neutrino
oscillation signal claimed by the Neutrino-4 collaboration at more than
$3\sigma$. We found that the results of the Neutrino-4 collaboration can be
reproduced approximately only by neglecting the effects of the energy
resolution of the detector. Including these effects, we found that the best fit
is obtained for a mixing that is even larger, close to maximal, but the
statistical significance of the short-baseline neutrino oscillation signal is
only about $2.7\sigma$ if evaluated with the usual method based on Wilks'
theorem. We show that the large Neutrino-4 mixing is in strong tension with the
KATRIN, PROSPECT, STEREO, and solar $\nu_{e}$ bounds. Using a more reliable
Monte Carlo simulation of a large set of Neutrino-4-like data, we found that
the statistical significance of the Neutrino-4 short-baseline neutrino
oscillation signal decreases to about $2.2\sigma$. We also show that it is not
unlikely to find a best-fit point that has a large mixing, even maximal, in the
absence of oscillations. Therefore, we conclude that the claimed Neutrino-4
indication in favor of short-baseline neutrino oscillations with very large
mixing is rather doubtful.
| [
{
"created": "Sun, 17 Jan 2021 21:16:34 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 2021 18:50:36 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Mar 2021 22:02:04 GMT",
"version": "v3"
}
] | 2021-03-24 | [
[
"Giunti",
"C.",
""
],
[
"Li",
"Y. F.",
""
],
[
"Ternes",
"C. A.",
""
],
[
"Zhang",
"Y. Y.",
""
]
] | We present a deep study of the Neutrino-4 data aimed at finding the statistical significance of the large-mixing short-baseline neutrino oscillation signal claimed by the Neutrino-4 collaboration at more than $3\sigma$. We found that the results of the Neutrino-4 collaboration can be reproduced approximately only by neglecting the effects of the energy resolution of the detector. Including these effects, we found that the best fit is obtained for a mixing that is even larger, close to maximal, but the statistical significance of the short-baseline neutrino oscillation signal is only about $2.7\sigma$ if evaluated with the usual method based on Wilks' theorem. We show that the large Neutrino-4 mixing is in strong tension with the KATRIN, PROSPECT, STEREO, and solar $\nu_{e}$ bounds. Using a more reliable Monte Carlo simulation of a large set of Neutrino-4-like data, we found that the statistical significance of the Neutrino-4 short-baseline neutrino oscillation signal decreases to about $2.2\sigma$. We also show that it is not unlikely to find a best-fit point that has a large mixing, even maximal, in the absence of oscillations. Therefore, we conclude that the claimed Neutrino-4 indication in favor of short-baseline neutrino oscillations with very large mixing is rather doubtful. |
2406.07615 | Andrey Sadofyev | Jo\~ao Barata, Sigtryggur Hauksson, Xo\'an Mayo L\'opez, and Andrey V.
Sadofyev | Jet quenching in the glasma phase: medium-induced radiation | 30 pages, 6 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Inspired by the recent considerations of parton momentum broadening in the
glasma phase, we study the medium-induced soft gluon radiation of jet partons
at early times in heavy-ion collisions. The glasma state is assumed to be
comprised of independent color domains with homogenous longitudinal fields that
vary event by event, and we further complete this model with an event-averaging
procedure accounting for the finite correlation length. Using this description,
we evaluate the rate of medium-induced radiation from an energetic parton at
midrapidity in the glasma phase. We mainly focus on SU(2) color fields for
simplicity, also referring to the U(1) case and comparing with the BDMPS-Z rate
to gain further insight. Our results show that there is an intricate interplay
of the synchrotron-like radiation in a single color domain with the destructive
interference between different color domains, after the medium averaging is
performed. Thus, we find that the emission rate is sensitive to the matter
structure, decreasing for a glasma state populated by smaller color domains,
i.e. for a glasma with a larger characteristic saturation scale. Our approach
can be applied to more realistic backgrounds, and sets the stage for the
modelling of jet evolution in the early stages of heavy-ion collisions.
| [
{
"created": "Tue, 11 Jun 2024 18:00:02 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Barata",
"João",
""
],
[
"Hauksson",
"Sigtryggur",
""
],
[
"López",
"Xoán Mayo",
""
],
[
"Sadofyev",
"Andrey V.",
""
]
] | Inspired by the recent considerations of parton momentum broadening in the glasma phase, we study the medium-induced soft gluon radiation of jet partons at early times in heavy-ion collisions. The glasma state is assumed to be comprised of independent color domains with homogenous longitudinal fields that vary event by event, and we further complete this model with an event-averaging procedure accounting for the finite correlation length. Using this description, we evaluate the rate of medium-induced radiation from an energetic parton at midrapidity in the glasma phase. We mainly focus on SU(2) color fields for simplicity, also referring to the U(1) case and comparing with the BDMPS-Z rate to gain further insight. Our results show that there is an intricate interplay of the synchrotron-like radiation in a single color domain with the destructive interference between different color domains, after the medium averaging is performed. Thus, we find that the emission rate is sensitive to the matter structure, decreasing for a glasma state populated by smaller color domains, i.e. for a glasma with a larger characteristic saturation scale. Our approach can be applied to more realistic backgrounds, and sets the stage for the modelling of jet evolution in the early stages of heavy-ion collisions. |
0810.2601 | Nikolay Achasov | N.N. Achasov | Light Scalars in Field Theory | 9 pages, 8 figures, Invited talk at QUARKS'2008, Sergiev Posad,
Russia, May 23-29, 2008 | null | null | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Outline: 1. Introduction, 2. Confinement, chiral dynamics and light scalar
mesons, 3. Chiral shielding of \sigma(600), chiral constraints, \sigma(600),
f_0(980) and their mixing in \pi\pi\to\pi\pi, \pi\pi\to K\bar K, and
\phi\to\gamma\pi0\pi0, 4. The \phi meson radiative decays on light scalar
resonances. 5. Why a0(980) and f0(980) are not the K\bar K molecules. 6. Light
scalars in \gamma\gamma collisions.
Evidence for four-quark components of light scalars is given. The priority of
Quantum Field Theory in revealing the light scalar mystery is emphasized.
| [
{
"created": "Wed, 15 Oct 2008 05:09:50 GMT",
"version": "v1"
}
] | 2008-10-16 | [
[
"Achasov",
"N. N.",
""
]
] | Outline: 1. Introduction, 2. Confinement, chiral dynamics and light scalar mesons, 3. Chiral shielding of \sigma(600), chiral constraints, \sigma(600), f_0(980) and their mixing in \pi\pi\to\pi\pi, \pi\pi\to K\bar K, and \phi\to\gamma\pi0\pi0, 4. The \phi meson radiative decays on light scalar resonances. 5. Why a0(980) and f0(980) are not the K\bar K molecules. 6. Light scalars in \gamma\gamma collisions. Evidence for four-quark components of light scalars is given. The priority of Quantum Field Theory in revealing the light scalar mystery is emphasized. |
hep-ph/0111086 | Takeshi Chiba | Takeshi Chiba and Kazunori Kohri | Quintessence Cosmology and Varying $\alpha$ | 7 pages | Prog.Theor.Phys. 107 (2002) 631-636 | 10.1143/PTP.107.631 | KUNS-1744, YITP-01-75 | hep-ph astro-ph | null | If the reported measurements of the time variation of the fine structure
constant from observations of distant QSOs are correct, combined with the Oklo
limit they would strongly constrain the class of the quintessence potential. If
these results prove valid, future satellite experiment (STEP) should measure
the induced violation of the weak equivalence principle. Future cosmological
observations of nearby $(z \siml 0.5)$ absorption systems would make it clear
whether the variation is significant or not.
| [
{
"created": "Thu, 8 Nov 2001 03:41:35 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Mar 2002 04:59:59 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Chiba",
"Takeshi",
""
],
[
"Kohri",
"Kazunori",
""
]
] | If the reported measurements of the time variation of the fine structure constant from observations of distant QSOs are correct, combined with the Oklo limit they would strongly constrain the class of the quintessence potential. If these results prove valid, future satellite experiment (STEP) should measure the induced violation of the weak equivalence principle. Future cosmological observations of nearby $(z \siml 0.5)$ absorption systems would make it clear whether the variation is significant or not. |
hep-ph/0503170 | Simon Albino | S. Albino, B. A. Kniehl, G. Kramer, W. Ochs | Generalizing the DGLAP Evolution of Fragmentation Functions to the
Smallest x Values | 10 pages, 3 figures | Phys.Rev.Lett. 95 (2005) 232002 | 10.1103/PhysRevLett.95.232002 | DESY 05-047, MPP-2005-19 | hep-ph | null | An approach which unifies the Double Logarithmic Approximation at small x and
the leading order DGLAP evolution of fragmentation functions at large x is
presented. This approach reproduces exactly the Modified Leading Logarithm
Approximation, but is more complete due to the degrees of freedom given to the
quark sector and the inclusion of the fixed order terms. We find that data from
the largest x values to the peak region can be better fitted than with other
approaches.
| [
{
"created": "Thu, 17 Mar 2005 15:31:46 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Albino",
"S.",
""
],
[
"Kniehl",
"B. A.",
""
],
[
"Kramer",
"G.",
""
],
[
"Ochs",
"W.",
""
]
] | An approach which unifies the Double Logarithmic Approximation at small x and the leading order DGLAP evolution of fragmentation functions at large x is presented. This approach reproduces exactly the Modified Leading Logarithm Approximation, but is more complete due to the degrees of freedom given to the quark sector and the inclusion of the fixed order terms. We find that data from the largest x values to the peak region can be better fitted than with other approaches. |
2010.09782 | Huayang Song | Honglei Li, Huayang Song, Shufang Su, Wei Su, and Jin Min Yang | MSSM at future Higgs factories | 20 pages, 7 figures | null | 10.1088/1674-1137/abe19b | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the implication of Higgs precision measurements at
future Higgs factories on the MSSM parameter space, focusing on the dominant
stop sector contributions. We perform a multi-variable fit to both the signal
strength for various Higgs decay channels at Higgs factories and the Higgs
mass. The chi-square fit results show sensitivity to mA, tan beta, stop mass
parameter mSUSY as well as the stop left-right mixing parameter Xt. We also
study the impact of the Higgs mass prediction on the MSSM and compare the
sensitivities of different Higgs factories.
| [
{
"created": "Mon, 19 Oct 2020 18:43:15 GMT",
"version": "v1"
}
] | 2021-05-26 | [
[
"Li",
"Honglei",
""
],
[
"Song",
"Huayang",
""
],
[
"Su",
"Shufang",
""
],
[
"Su",
"Wei",
""
],
[
"Yang",
"Jin Min",
""
]
] | In this work, we study the implication of Higgs precision measurements at future Higgs factories on the MSSM parameter space, focusing on the dominant stop sector contributions. We perform a multi-variable fit to both the signal strength for various Higgs decay channels at Higgs factories and the Higgs mass. The chi-square fit results show sensitivity to mA, tan beta, stop mass parameter mSUSY as well as the stop left-right mixing parameter Xt. We also study the impact of the Higgs mass prediction on the MSSM and compare the sensitivities of different Higgs factories. |
hep-ph/0309080 | Alexandre Grezzi de Miranda Schmidt | A.T.Suzuki, E.S.Santos, A.G.M.Schmidt | One-loop N-point equivalence among negative-dimensional, Mellin-Barnes
and Feynman parametrization approaches to Feynman integrals | 11 pages, LaTeX. To be published in J.Phys.A | J.Phys.A36:11859-11872,2003 | 10.1088/0305-4470/36/47/012 | null | hep-ph | null | We show that at one-loop order, negative-dimensional, Mellin-Barnes' (MB) and
Feynman parametrization (FP) approaches to Feynman loop integrals calculations
are equivalent. Starting with a generating functional, for two and then for
$N$-point scalar integrals we show how to reobtain MB results, using
negative-dimensional and FP techniques. The $N-$point result is valid for
different masses, arbitrary exponents of propagators and dimension.
| [
{
"created": "Mon, 8 Sep 2003 19:50:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Suzuki",
"A. T.",
""
],
[
"Santos",
"E. S.",
""
],
[
"Schmidt",
"A. G. M.",
""
]
] | We show that at one-loop order, negative-dimensional, Mellin-Barnes' (MB) and Feynman parametrization (FP) approaches to Feynman loop integrals calculations are equivalent. Starting with a generating functional, for two and then for $N$-point scalar integrals we show how to reobtain MB results, using negative-dimensional and FP techniques. The $N-$point result is valid for different masses, arbitrary exponents of propagators and dimension. |
1502.01700 | Hamza Berrehrah | H. Berrehrah, E. Bratkovskaya, W. Cassing, P.B. Gossiaux, and J.
Aichelin | Heavy quark scattering and quenching in a QCD medium at finite
temperature and chemical potential | 19 pages, 28 figures | null | 10.1103/PhysRevC.91.054902 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The heavy quark collisional scattering on partons of the quark gluon plasma
(QGP) is studied in a QCD medium at finite temperature and chemical potential.
We evaluate the effects of finite parton masses and widths, finite temperature
$T$ and quark chemical potential $\mu_q$ on the different elastic cross
sections for dynamical quasi-particles (on- and off-shell particles in the QGP
medium as described by the dynamical quasi-particles model "DQPM") using the
leading order Born diagrams. Our results show clearly the decrease of the $qQ$
and $gQ$ total elastic cross sections when the temperature and the quark
chemical potential increase. These effects are amplified for finite $\mu_q$ at
temperatures lower than the corresponding critical temperature $T_c (\mu_q)$.
Using these cross sections we, furthermore, estimate the energy loss and
longitudinal and transverse momentum transfers of a heavy quark propagating in
a finite temperature and chemical potential medium. Accordingly, we have shown
that the transport properties of heavy quarks are sensitive to the temperature
and chemical potential variations. Our results provide some basic ingredients
for the study of charm physics in heavy-ion collisions at Beam Energy Scan
(BES) at RHIC and CBM experiment at FAIR.
| [
{
"created": "Thu, 5 Feb 2015 20:10:02 GMT",
"version": "v1"
}
] | 2015-05-11 | [
[
"Berrehrah",
"H.",
""
],
[
"Bratkovskaya",
"E.",
""
],
[
"Cassing",
"W.",
""
],
[
"Gossiaux",
"P. B.",
""
],
[
"Aichelin",
"J.",
""
]
] | The heavy quark collisional scattering on partons of the quark gluon plasma (QGP) is studied in a QCD medium at finite temperature and chemical potential. We evaluate the effects of finite parton masses and widths, finite temperature $T$ and quark chemical potential $\mu_q$ on the different elastic cross sections for dynamical quasi-particles (on- and off-shell particles in the QGP medium as described by the dynamical quasi-particles model "DQPM") using the leading order Born diagrams. Our results show clearly the decrease of the $qQ$ and $gQ$ total elastic cross sections when the temperature and the quark chemical potential increase. These effects are amplified for finite $\mu_q$ at temperatures lower than the corresponding critical temperature $T_c (\mu_q)$. Using these cross sections we, furthermore, estimate the energy loss and longitudinal and transverse momentum transfers of a heavy quark propagating in a finite temperature and chemical potential medium. Accordingly, we have shown that the transport properties of heavy quarks are sensitive to the temperature and chemical potential variations. Our results provide some basic ingredients for the study of charm physics in heavy-ion collisions at Beam Energy Scan (BES) at RHIC and CBM experiment at FAIR. |
hep-ph/0310295 | Ramazan Sever | Sameer M. Ikhdair and Ramazan Sever | Spectroscopy of $B_{c}$ meson in a semi-relativistic quark model using
the shifted large-N expansion method | 32 | Int.J.Mod.Phys.A19:1771-1792,2004 | 10.1142/S0217751X0401780X | null | hep-ph | null | We calculate the $c\bar{b}$ mass spectrum, the splitting values and some
other properties in the framework of the semi-relativistic equation by applying
the shifted large-N expansion technique. We use seven different central
potentials together with an improved QCD-motivated interquark potentials
calculated to two loops in the modified minimal-subtraction $% (\bar{MS}) $
scheme. The parameters of these potentials are fitted to generate the
semi-relativistic bound states of $ c\bar{b}$ quarkonium system in close
conformity with the experimental and the present available calculated
center-of-gravity (c.o.g.) data. Calculations of the energy bound states are
carried out up to third order. Our results are in excellent fit with the
results of the other works.
| [
{
"created": "Mon, 27 Oct 2003 08:24:19 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Oct 2003 11:31:14 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Ikhdair",
"Sameer M.",
""
],
[
"Sever",
"Ramazan",
""
]
] | We calculate the $c\bar{b}$ mass spectrum, the splitting values and some other properties in the framework of the semi-relativistic equation by applying the shifted large-N expansion technique. We use seven different central potentials together with an improved QCD-motivated interquark potentials calculated to two loops in the modified minimal-subtraction $% (\bar{MS}) $ scheme. The parameters of these potentials are fitted to generate the semi-relativistic bound states of $ c\bar{b}$ quarkonium system in close conformity with the experimental and the present available calculated center-of-gravity (c.o.g.) data. Calculations of the energy bound states are carried out up to third order. Our results are in excellent fit with the results of the other works. |
1503.01084 | Ivo de Medeiros Varzielas | Ivo de Medeiros Varzielas, Gudrun Hiller | Clues for flavor from rare lepton and quark decays | 23 pages plus references and appendices, 1 figure; v2: comment on mu
to e conversion and references added, conclusions unchanged; v3: footnote 3
added, typos fixed | null | null | DO-TH 15/02, QFET-2015-04 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavor symmetries successfully explain lepton and quark masses and mixings
yet it is usually hard to distinguish different models that predict the same
mixing angles. Further experimental input could be available, if the agents of
flavor breaking are sufficiently low in mass and detectable or if new physics
with non-trivial flavor charges is sufficiently low in mass and detectable. The
recent hint for lepton-nonuniversality in the ratio of branching fractions $B
\to K \mu \mu$ over $B \to K e e$, $R_K$, suggests the latter, at least for
indirect detection via rare decays. We demonstrate the discriminating power of
the rare decay data on flavor model building taking into account viable
leptonic mixings and show how correlations with other observables exist in
leptoquark models. We give expectations for branching ratios $B \to K \ell
\ell^\prime, B_{(s)} \to \ell \ell^\prime$ and $\ell \to \ell^\prime \gamma$,
and Higgs decays $h \to \ell \ell^\prime$.
| [
{
"created": "Tue, 3 Mar 2015 20:05:01 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jun 2015 08:22:11 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Sep 2015 08:34:21 GMT",
"version": "v3"
}
] | 2015-09-03 | [
[
"Varzielas",
"Ivo de Medeiros",
""
],
[
"Hiller",
"Gudrun",
""
]
] | Flavor symmetries successfully explain lepton and quark masses and mixings yet it is usually hard to distinguish different models that predict the same mixing angles. Further experimental input could be available, if the agents of flavor breaking are sufficiently low in mass and detectable or if new physics with non-trivial flavor charges is sufficiently low in mass and detectable. The recent hint for lepton-nonuniversality in the ratio of branching fractions $B \to K \mu \mu$ over $B \to K e e$, $R_K$, suggests the latter, at least for indirect detection via rare decays. We demonstrate the discriminating power of the rare decay data on flavor model building taking into account viable leptonic mixings and show how correlations with other observables exist in leptoquark models. We give expectations for branching ratios $B \to K \ell \ell^\prime, B_{(s)} \to \ell \ell^\prime$ and $\ell \to \ell^\prime \gamma$, and Higgs decays $h \to \ell \ell^\prime$. |
2003.03525 | Yonghee Kim | Yonghee Kim, Emiko Hiyama, Makoto Oka, Kei Suzuki | Spectrum of singly heavy baryons from a chiral effective theory of
diquarks | 10 pages, 2 figures, 3 tables; published version | Phys. Rev. D 102, 014004 (2020) | 10.1103/PhysRevD.102.014004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass spectra of singly charmed and bottom baryons,
$\Lambda_{c/b}(1/2^\pm,3/2^-)$ and $\Xi_{c/b}(1/2^\pm,3/2^-)$, are investigated
using a nonrelativistic potential model with a heavy quark and a light diquark.
The masses of the scalar and pseudoscalar diquarks are taken from a chiral
effective theory. The effect of $U_A(1)$ anomaly induces an inverse hierarchy
between the masses of strange and non-strange pseudoscalar diquarks, which
leads to a similar inverse mass ordering in $\rho$-mode excitations of singly
heavy baryons.
| [
{
"created": "Sat, 7 Mar 2020 07:16:04 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 2020 05:40:48 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Kim",
"Yonghee",
""
],
[
"Hiyama",
"Emiko",
""
],
[
"Oka",
"Makoto",
""
],
[
"Suzuki",
"Kei",
""
]
] | The mass spectra of singly charmed and bottom baryons, $\Lambda_{c/b}(1/2^\pm,3/2^-)$ and $\Xi_{c/b}(1/2^\pm,3/2^-)$, are investigated using a nonrelativistic potential model with a heavy quark and a light diquark. The masses of the scalar and pseudoscalar diquarks are taken from a chiral effective theory. The effect of $U_A(1)$ anomaly induces an inverse hierarchy between the masses of strange and non-strange pseudoscalar diquarks, which leads to a similar inverse mass ordering in $\rho$-mode excitations of singly heavy baryons. |
0911.3656 | David Krohn | Tao Han, David Krohn, Lian-Tao Wang, and Wenhan Zhu | New Physics Signals in Longitudinal Gauge Boson Scattering at the LHC | null | JHEP 1003:082,2010 | 10.1007/JHEP03(2010)082 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a novel technique designed to look for signatures of new physics
in vector boson fusion processes at the TeV scale. This functions by measuring
the polarization of the vector bosons to determine the relative longitudinal to
transverse production. In studying this ratio we can directly probe the high
energy E^2-growth of longitudinal vector boson scattering amplitudes
characteristic of models with non-Standard Model (SM) interactions. We will
focus on studying models parameterized by an effective Lagrangian that include
a light Higgs with non-SM couplings arising from TeV scale new physics
associated with the electroweak symmetry breaking, although our technique can
be used in more general scenarios. We will show that this technique is stable
against the large uncertainties that can result from variations in the
factorization scale, improving upon previous studies that measure cross section
alone.
| [
{
"created": "Thu, 19 Nov 2009 17:58:24 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Han",
"Tao",
""
],
[
"Krohn",
"David",
""
],
[
"Wang",
"Lian-Tao",
""
],
[
"Zhu",
"Wenhan",
""
]
] | We introduce a novel technique designed to look for signatures of new physics in vector boson fusion processes at the TeV scale. This functions by measuring the polarization of the vector bosons to determine the relative longitudinal to transverse production. In studying this ratio we can directly probe the high energy E^2-growth of longitudinal vector boson scattering amplitudes characteristic of models with non-Standard Model (SM) interactions. We will focus on studying models parameterized by an effective Lagrangian that include a light Higgs with non-SM couplings arising from TeV scale new physics associated with the electroweak symmetry breaking, although our technique can be used in more general scenarios. We will show that this technique is stable against the large uncertainties that can result from variations in the factorization scale, improving upon previous studies that measure cross section alone. |
0705.1496 | Pietro Slavich | Nicolas Bernal, Abdelhak Djouadi, Pietro Slavich | The MSSM with heavy scalars | 51 pages, 18 figures. v2: references and MSbar-DRbar translation
formulae added; version published in JHEP. v3: footnote on MSbar-DRbar
conversion added in the appendix | JHEP0707:016,2007 | 10.1088/1126-6708/2007/07/016 | LPT-07-25; CERN-PH-TH/2007-074 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a comprehensive analysis of the Minimal Supersymmetric Standard
Model (MSSM) in the scenario where the scalar partners of the fermions and the
Higgs particles (except for the Standard-Model-like one) are assumed to be very
heavy and are removed from the low-energy spectrum. We first summarize our
determination of the mass spectrum, in which we include the one-loop radiative
corrections and resum to all orders the leading logarithms of the large scalar
masses, and describe the implementation of these features in the FORTRAN code
SuSpect which calculates the masses and couplings of the MSSM particles. We
then study in detail the phenomenology of the model in scenarios where the
gaugino mass parameters are non-universal at the GUT scale, which leads to very
interesting features that are not present in the widely studied case of
universal gaugino mass parameters. We discuss the constraints from collider
searches and high-precision measurements, the cosmological constraints on the
relic abundance of the neutralino candidate for the Dark Matter in the Universe
- where new and interesting channels for neutralino annihilation appear - and
the gluino lifetime. We then analyze, in the case of non-universal gaugino
masses, the decays of the Higgs boson (in particular decays into and
contributions of SUSY particles), of charginos and neutralinos (in particular
decays into Higgs bosons and photons) and of gluinos, and highlight the
differences from the case of universal gaugino masses.
| [
{
"created": "Thu, 10 May 2007 19:23:01 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jul 2007 13:58:07 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Dec 2011 20:32:50 GMT",
"version": "v3"
}
] | 2011-12-09 | [
[
"Bernal",
"Nicolas",
""
],
[
"Djouadi",
"Abdelhak",
""
],
[
"Slavich",
"Pietro",
""
]
] | We perform a comprehensive analysis of the Minimal Supersymmetric Standard Model (MSSM) in the scenario where the scalar partners of the fermions and the Higgs particles (except for the Standard-Model-like one) are assumed to be very heavy and are removed from the low-energy spectrum. We first summarize our determination of the mass spectrum, in which we include the one-loop radiative corrections and resum to all orders the leading logarithms of the large scalar masses, and describe the implementation of these features in the FORTRAN code SuSpect which calculates the masses and couplings of the MSSM particles. We then study in detail the phenomenology of the model in scenarios where the gaugino mass parameters are non-universal at the GUT scale, which leads to very interesting features that are not present in the widely studied case of universal gaugino mass parameters. We discuss the constraints from collider searches and high-precision measurements, the cosmological constraints on the relic abundance of the neutralino candidate for the Dark Matter in the Universe - where new and interesting channels for neutralino annihilation appear - and the gluino lifetime. We then analyze, in the case of non-universal gaugino masses, the decays of the Higgs boson (in particular decays into and contributions of SUSY particles), of charginos and neutralinos (in particular decays into Higgs bosons and photons) and of gluinos, and highlight the differences from the case of universal gaugino masses. |
2008.05206 | Christopher Gorham Lester | Christopher G. Lester and Ward Haddadin and Ben Gripaios | Lorentz and permutation invariants of particles III: constraining
non-standard sources of parity violation | 66 pages, 2 figures; v2: typos corrected + added "Preamble concerning
..." sec before Introduction; v3: fixed comment in reference implementation,
and updated bibliography; v4: typos fixed and (anc) implementation replaced
with better one; v5: fixed an incorrect statement in preamble and another in
Sec 6, and added new Corollary 5.3, v6: clarifications added at suggestion of
referee | International Journal of Modern Physics, Volume No. 37, Issue No.
16, Article No. 2250093, Year 2022 | 10.1142/S0217751X22500932 | CAVENDISH-HEP-20/10 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Comparisons of the positive and negative halves of the distributions of
parity-odd event variables in particle-physics experimental data can provide
sensitivity to sources of non-standard parity violation. Such techniques
benefit from lacking first-order dependence on simulations or theoretical
models, but have hitherto lacked systematic means of enumerating all
discoverable signals. To address that issue this paper seeks to construct sets
of parity-odd event variables which may be proved to be able to reveal the
existence of any Lorentz-invariant source of non-standard parity violation
which could be visible in data consisting of groups of real non space-like
four-momenta exhibiting certain permutation symmetries.
| [
{
"created": "Wed, 12 Aug 2020 09:57:02 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Mar 2021 15:59:38 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Nov 2021 16:31:33 GMT",
"version": "v3"
},
{
"created": "Sun, 19 Dec 2021 00:00:08 GMT",
"version": "v4"
},
{
"c... | 2022-07-14 | [
[
"Lester",
"Christopher G.",
""
],
[
"Haddadin",
"Ward",
""
],
[
"Gripaios",
"Ben",
""
]
] | Comparisons of the positive and negative halves of the distributions of parity-odd event variables in particle-physics experimental data can provide sensitivity to sources of non-standard parity violation. Such techniques benefit from lacking first-order dependence on simulations or theoretical models, but have hitherto lacked systematic means of enumerating all discoverable signals. To address that issue this paper seeks to construct sets of parity-odd event variables which may be proved to be able to reveal the existence of any Lorentz-invariant source of non-standard parity violation which could be visible in data consisting of groups of real non space-like four-momenta exhibiting certain permutation symmetries. |
2310.10034 | Yong Du | Yong Du | $N_{\rm eff}$ as a new physics probe in the precision era of cosmology | a new subsection for a new numerical approach to Neff in the SMEFT;
updated the discussion of the global fit and its impact on $Y_P$, as well as
the references and the funding information | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by-sa/4.0/ | We perform a global fit to the electroweak vertices and 4-fermion operators
of the standard model effective field theory in this work using $N_{\rm eff}$
from cosmological probes, as well as data sets from colliders and low-energy
experiments. We find $N_{\rm eff}$, both its current measurement and future
projections, can only marginally improve the fit in both the flavor universal
and the most general flavor scenarios. The resulting $1\sigma$ bound on $N_{\rm
eff}$ is significantly improved from the global fit and becomes comparable to
its current theoretical uncertainty, such that the latter will become important
for this study at next generation experiments like future lepton colliders.
$N_{\rm eff}$ from the global fit is also adopted to predict the primordial
helium abundance $Y_P$, which significantly reduces the parameter space on the
$Y_P$-$N_{\rm eff}$ plane. Through error propagation, we also conclude that
reducing the experimental uncertainty of $Y_P$ from metal-poor galaxies down
below 0.2% could play an important role in deepening our understanding on the
free neutron lifetime anomaly.
| [
{
"created": "Mon, 16 Oct 2023 03:31:05 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2024 13:59:05 GMT",
"version": "v2"
}
] | 2024-01-24 | [
[
"Du",
"Yong",
""
]
] | We perform a global fit to the electroweak vertices and 4-fermion operators of the standard model effective field theory in this work using $N_{\rm eff}$ from cosmological probes, as well as data sets from colliders and low-energy experiments. We find $N_{\rm eff}$, both its current measurement and future projections, can only marginally improve the fit in both the flavor universal and the most general flavor scenarios. The resulting $1\sigma$ bound on $N_{\rm eff}$ is significantly improved from the global fit and becomes comparable to its current theoretical uncertainty, such that the latter will become important for this study at next generation experiments like future lepton colliders. $N_{\rm eff}$ from the global fit is also adopted to predict the primordial helium abundance $Y_P$, which significantly reduces the parameter space on the $Y_P$-$N_{\rm eff}$ plane. Through error propagation, we also conclude that reducing the experimental uncertainty of $Y_P$ from metal-poor galaxies down below 0.2% could play an important role in deepening our understanding on the free neutron lifetime anomaly. |
hep-ph/0206283 | Aldo Deandrea | Aldo Deandrea | Charged Higgs in Models with Singlet Neutrino in Large Extra Dimensions | 4 pages, LaTeX2e, 2 figures, 2 tables, Talk given at XXXVIIth
Rencontres de Moriond, ElectroWeak Interactions and Unified Theories, March
9th - 16th 2002, Les Arcs, France | null | null | LYCEN-2002-33 | hep-ph | null | The charged Higgs decay in the channel H^- ->tau_L^- nu in models with a
singlet neutrino can provide a test of large extra dimensions models with TeV
scale quantum gravity since in the standard two Higgs doublet model type II,
H^- -> tau_L^- nu is suppressed. In the present study, we focus on the decay
H^- -> tau_L^- nu at the LHC for Higgs masses larger than the top-quark mass.
| [
{
"created": "Thu, 27 Jun 2002 09:58:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Deandrea",
"Aldo",
""
]
] | The charged Higgs decay in the channel H^- ->tau_L^- nu in models with a singlet neutrino can provide a test of large extra dimensions models with TeV scale quantum gravity since in the standard two Higgs doublet model type II, H^- -> tau_L^- nu is suppressed. In the present study, we focus on the decay H^- -> tau_L^- nu at the LHC for Higgs masses larger than the top-quark mass. |
2007.08205 | Vandana Sahdev | Debajyoti Choudhury, Suvam Maharana, Divya Sachdeva and Vandana Sahdev | Dark Matter, Muon Anomalous Magnetic Moment and the XENON1T Excess | 7 pages, 4 figures; matches published version | Phys. Rev. D 103, 015006 (2021) | 10.1103/PhysRevD.103.015006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A very economic scenario with just three extra scalar fields beyond the
Standard Model is invoked to explain the muon anomalous magnetic moment, the
requisite relic abundance of dark matter as well as the Xenon-1T excess through
the inelastic down-scattering of the dark scalar.
| [
{
"created": "Thu, 16 Jul 2020 09:30:22 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jul 2020 11:57:54 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Sep 2020 11:55:49 GMT",
"version": "v3"
},
{
"created": "Sun, 17 Jan 2021 14:50:22 GMT",
"version": "v4"
}
] | 2021-01-19 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Maharana",
"Suvam",
""
],
[
"Sachdeva",
"Divya",
""
],
[
"Sahdev",
"Vandana",
""
]
] | A very economic scenario with just three extra scalar fields beyond the Standard Model is invoked to explain the muon anomalous magnetic moment, the requisite relic abundance of dark matter as well as the Xenon-1T excess through the inelastic down-scattering of the dark scalar. |
hep-ph/9611310 | Eric S. Swanson | Adam P. Szczepaniak and Eric S. Swanson | On the Dirac Structure of Confinement | 18 pages, RevTex, 1 postscript figure | Phys.Rev.D55:3987-3993,1997 | 10.1103/PhysRevD.55.3987 | null | hep-ph | null | The Dirac structure of confinement is shown to be of timelike-vector nature
in the heavy quark limit of QCD. This stands in contradiction with the
phenomenological success of the Dirac scalar confining potential. A resolution
is achieved through the demonstration that an effective scalar interaction is
dynamically generated by nonperturbative mixing between ordinary and hybrid $Q
\bar Q$ states. The resolution depends crucially on the collective nature of
the gluonic degrees of freedom. This implies that dynamical gluonic effects are
vital when attempting to incorporate fine structure in models of the $Q \bar Q$
interaction.
| [
{
"created": "Tue, 12 Nov 1996 17:01:15 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Szczepaniak",
"Adam P.",
""
],
[
"Swanson",
"Eric S.",
""
]
] | The Dirac structure of confinement is shown to be of timelike-vector nature in the heavy quark limit of QCD. This stands in contradiction with the phenomenological success of the Dirac scalar confining potential. A resolution is achieved through the demonstration that an effective scalar interaction is dynamically generated by nonperturbative mixing between ordinary and hybrid $Q \bar Q$ states. The resolution depends crucially on the collective nature of the gluonic degrees of freedom. This implies that dynamical gluonic effects are vital when attempting to incorporate fine structure in models of the $Q \bar Q$ interaction. |
2212.13583 | Santiago Tanco | Ezequiel Alvarez, Manuel Szewc, Alejandro Szynkman, Santiago A. Tanco,
Tatiana Tarutina | Exploring unsupervised top tagging using Bayesian inference | 15 pages, 6 figures; Published version | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Recognizing hadronically decaying top-quark jets in a sample of jets, or even
its total fraction in the sample, is an important step in many LHC searches for
Standard Model and Beyond Standard Model physics as well. Although there exists
outstanding top-tagger algorithms, their construction and their expected
performance rely on Montecarlo simulations, which may induce potential biases.
For these reasons we develop two simple unsupervised top-tagger algorithms
based on performing Bayesian inference on a mixture model. In one of them we
use as the observed variable a new geometrically-based observable
$\tilde{A}_{3}$, and in the other we consider the more traditional
$\tau_{3}/\tau_{2}$ $N$-subjettiness ratio, which yields a better performance.
As expected, we find that the unsupervised tagger performance is below existing
supervised taggers, reaching expected Area Under Curve AUC $\sim 0.80-0.81$ and
accuracies of about 69% $-$ 75% in a full range of sample purity. However,
these performances are more robust to possible biases in the Montecarlo that
their supervised counterparts. Our findings are a step towards exploring and
considering simpler and unbiased taggers.
| [
{
"created": "Tue, 27 Dec 2022 19:05:01 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2023 08:10:42 GMT",
"version": "v2"
}
] | 2023-06-26 | [
[
"Alvarez",
"Ezequiel",
""
],
[
"Szewc",
"Manuel",
""
],
[
"Szynkman",
"Alejandro",
""
],
[
"Tanco",
"Santiago A.",
""
],
[
"Tarutina",
"Tatiana",
""
]
] | Recognizing hadronically decaying top-quark jets in a sample of jets, or even its total fraction in the sample, is an important step in many LHC searches for Standard Model and Beyond Standard Model physics as well. Although there exists outstanding top-tagger algorithms, their construction and their expected performance rely on Montecarlo simulations, which may induce potential biases. For these reasons we develop two simple unsupervised top-tagger algorithms based on performing Bayesian inference on a mixture model. In one of them we use as the observed variable a new geometrically-based observable $\tilde{A}_{3}$, and in the other we consider the more traditional $\tau_{3}/\tau_{2}$ $N$-subjettiness ratio, which yields a better performance. As expected, we find that the unsupervised tagger performance is below existing supervised taggers, reaching expected Area Under Curve AUC $\sim 0.80-0.81$ and accuracies of about 69% $-$ 75% in a full range of sample purity. However, these performances are more robust to possible biases in the Montecarlo that their supervised counterparts. Our findings are a step towards exploring and considering simpler and unbiased taggers. |
1110.2959 | Francesco Scardina | F. Scardina, M. Di Toro, V. Greco | Impact of temperature dependence of the energy loss on jet quenching
observables | 7 pages, 8 figures, Workshop WISH 2010 | Il Nuovo Cimento C, Vol. 34, Issue 2, pp. 67-73, 2011 | 10.1393/ncc/i2011-10835-8 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quenching of jets (particles with $p_T>>T, \Lambda_{QCD}$) in
ultra-relativistic heavy-ion collisions has been one of the main prediction and
discovery at RHIC. We have studied, by a simple jet quenching modeling, the
correlation between different observables like the nuclear modification factor
$\Rapt$, the elliptic flow $v_2$ and the ratio of quark to gluon suppression
$R_{AA}(quark)/R_{AA}(gluon)$. We show that the relation among these
observables is strongly affected by the temperature dependence of the energy
loss. In particular the large $v_2$ and and the nearly equal $\Rapt$ of quarks
and gluons can be accounted for only if the energy loss occurs mainly around
the temperature $T_c$ and the flavour conversion is significant.Finally we
point out that the efficency in the conversion of the space eccentricity into
the momentum one ($v_2$) results to be quite smaller respect to the one coming
from elastic scatterings in a fluid with a viscosity to entropy density ratio
$4\pi\eta/s=1$.
| [
{
"created": "Thu, 13 Oct 2011 14:30:46 GMT",
"version": "v1"
}
] | 2011-10-14 | [
[
"Scardina",
"F.",
""
],
[
"Di Toro",
"M.",
""
],
[
"Greco",
"V.",
""
]
] | The quenching of jets (particles with $p_T>>T, \Lambda_{QCD}$) in ultra-relativistic heavy-ion collisions has been one of the main prediction and discovery at RHIC. We have studied, by a simple jet quenching modeling, the correlation between different observables like the nuclear modification factor $\Rapt$, the elliptic flow $v_2$ and the ratio of quark to gluon suppression $R_{AA}(quark)/R_{AA}(gluon)$. We show that the relation among these observables is strongly affected by the temperature dependence of the energy loss. In particular the large $v_2$ and and the nearly equal $\Rapt$ of quarks and gluons can be accounted for only if the energy loss occurs mainly around the temperature $T_c$ and the flavour conversion is significant.Finally we point out that the efficency in the conversion of the space eccentricity into the momentum one ($v_2$) results to be quite smaller respect to the one coming from elastic scatterings in a fluid with a viscosity to entropy density ratio $4\pi\eta/s=1$. |
1904.00304 | Bal\'azs Endre Szigeti | Bal\'azs Endre Szigeti, Monika Varga-Kofarago | Study of angular correlations in Monte Carlo simulations | 6 pages, 10 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In two-particle angular correlation measurements the distribution of charged
hadron pairs are evaluated as a function of pseudorapidity ($\Delta \eta$) and
azimuthal ($\Delta \varphi$) differences. In these correlations, jets manifest
themselves as a near-side peak around $\Delta \eta = 0,$ $\Delta \varphi = 0$.
These correlations can be used to extract transverse momentum ($p_T$) and
centrality dependence of the shape of the near-side peak in Pb-Pb collision.
The shape of the near-side peak is quantified by the variances of the
distribution. The variances are evaluated from a fit combining the peak and the
background. In this contribution, identified and unidentified angular
correlations are shown from Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV from
Monte Carlo simulations (AMPT, PYTHIA 8.235/Angantyr). Results show that
transport models in AMPT give better results than PYTHIA 8.235/Angantyr when
comparing to the experimental results of the ALICE collaboration.
| [
{
"created": "Sat, 30 Mar 2019 22:58:03 GMT",
"version": "v1"
}
] | 2019-04-02 | [
[
"Szigeti",
"Balázs Endre",
""
],
[
"Varga-Kofarago",
"Monika",
""
]
] | In two-particle angular correlation measurements the distribution of charged hadron pairs are evaluated as a function of pseudorapidity ($\Delta \eta$) and azimuthal ($\Delta \varphi$) differences. In these correlations, jets manifest themselves as a near-side peak around $\Delta \eta = 0,$ $\Delta \varphi = 0$. These correlations can be used to extract transverse momentum ($p_T$) and centrality dependence of the shape of the near-side peak in Pb-Pb collision. The shape of the near-side peak is quantified by the variances of the distribution. The variances are evaluated from a fit combining the peak and the background. In this contribution, identified and unidentified angular correlations are shown from Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV from Monte Carlo simulations (AMPT, PYTHIA 8.235/Angantyr). Results show that transport models in AMPT give better results than PYTHIA 8.235/Angantyr when comparing to the experimental results of the ALICE collaboration. |
hep-ph/9704380 | Steve Godfrey | Stephen Godfrey | Comment on $Z'$'s and the H1 and ZEUS High $Q^2$ Anomalies | Latex file uses revtex version 3, epsfig, 1 postscript figure is
attached | Mod.Phys.Lett.A12:1859-1863,1997 | 10.1142/S0217732397001898 | OCIP/C-97-04 | hep-ph | null | We investigate the effects of extra neutral gauge bosons on the high $Q^2$
region of the $e^+p \to e^+ X$ cross section at $\sqrt{s}=300$ GeV. We found
that the only models with electroweak strength coupling, typical of extended
gauge theories, that give a better fit to the H1 and ZEUS high $Q^2$ data than
the standard model, are ruled out by existing data from the Tevatron. From
general scaling arguments, using the allowed contact interactions, the only
allowed models with $Z'$'s would be those with strong couplings although even
in this case the statistical evidence is not compelling.
| [
{
"created": "Tue, 22 Apr 1997 23:55:45 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Godfrey",
"Stephen",
""
]
] | We investigate the effects of extra neutral gauge bosons on the high $Q^2$ region of the $e^+p \to e^+ X$ cross section at $\sqrt{s}=300$ GeV. We found that the only models with electroweak strength coupling, typical of extended gauge theories, that give a better fit to the H1 and ZEUS high $Q^2$ data than the standard model, are ruled out by existing data from the Tevatron. From general scaling arguments, using the allowed contact interactions, the only allowed models with $Z'$'s would be those with strong couplings although even in this case the statistical evidence is not compelling. |
hep-ph/0008027 | Jens Andersen | Jens O. Andersen | Three Loop Free Energy Using Screened Perturbation Theory | 5 pages including 2 figures. Talk given at Conference on Strong and
Electroweak Matter (SEWM 2000), Marseille, France, 14-17 June 2000 | null | 10.1142/9789812799913_0013 | null | hep-ph | null | The conventional weak-coupling expansion for the pressure of a hot plasma
shows no sign of convergence unless the the coupling constant $g$ is tiny. In
this talk, I discuss screened perturbation theory (SPT) which is a
reorganization of the perturbative expansion by adding and subtracting a local
mass term in the Lagrangian. We consider several different mass prescriptions,
and compute the pressure to three-loop order. The SPT-improved approximations
appear to converge for rather large values of the coupling constant.
| [
{
"created": "Thu, 3 Aug 2000 07:30:52 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Andersen",
"Jens O.",
""
]
] | The conventional weak-coupling expansion for the pressure of a hot plasma shows no sign of convergence unless the the coupling constant $g$ is tiny. In this talk, I discuss screened perturbation theory (SPT) which is a reorganization of the perturbative expansion by adding and subtracting a local mass term in the Lagrangian. We consider several different mass prescriptions, and compute the pressure to three-loop order. The SPT-improved approximations appear to converge for rather large values of the coupling constant. |
hep-ph/0701051 | Stephen P. Martin | Stephen P. Martin | Three-loop corrections to the lightest Higgs scalar boson mass in
supersymmetry | 9 pages | Phys.Rev.D75:055005,2007 | 10.1103/PhysRevD.75.055005 | null | hep-ph | null | I evaluate the largest three-loop corrections to the mass of the lightest
Higgs scalar boson in the Minimal Supersymmetric Standard Model in a
mass-independent renormalization scheme, using effective field theory and
renormalization group methods. The contributions found here are those that
depend only on strong and Yukawa interactions and on the leading and
next-to-leading logarithms of the ratio of a typical superpartner mass scale to
the top quark mass. The approximation assumes that all superpartners and the
other Higgs bosons can be treated as much heavier than the top quark, but does
not assume their degeneracy. I also discuss the consistent addition of the
three-loop corrections to a complete two-loop calculation.
| [
{
"created": "Mon, 8 Jan 2007 15:20:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Martin",
"Stephen P.",
""
]
] | I evaluate the largest three-loop corrections to the mass of the lightest Higgs scalar boson in the Minimal Supersymmetric Standard Model in a mass-independent renormalization scheme, using effective field theory and renormalization group methods. The contributions found here are those that depend only on strong and Yukawa interactions and on the leading and next-to-leading logarithms of the ratio of a typical superpartner mass scale to the top quark mass. The approximation assumes that all superpartners and the other Higgs bosons can be treated as much heavier than the top quark, but does not assume their degeneracy. I also discuss the consistent addition of the three-loop corrections to a complete two-loop calculation. |
hep-ph/0702242 | Poulose Poulose Dr. | S. Moretti, S. Munir, P. Poulose (University of Southampton) | Explicit CP Violation in the MSSM Through Higgs --> gamma.gamma | 12 Pages. RevTex4 | Phys.Lett.B649:206-211,2007 | 10.1016/j.physletb.2007.03.053 | SHEP-07-04 | hep-ph | null | The MSSM with explicit CP violation is studied through the di-photon decay
channel of the lightest neutral Higgs boson. Through the leading one-loop order
H1 --> gammar.gamma is affected by a large number of Higgs-sparticle couplings,
which could be complex. Our preliminary scan over the Supersymmetric parameter
space shows that more than 50% average deviations are possible, in either
direction, in the corresponding branching ratio, with respect to the case of
the CP-conserving MSSM. In particular, our analysis shows that in the presence
of a light stop (with mass ~ 200 GeV) a CP-violating phase Arg(mu) ~ 90(deg)
can render the H1 --> gamma.gamma branching ratio more than 10 times larger,
for suitable combinations of the other MSSM parameters.
| [
{
"created": "Fri, 23 Feb 2007 14:00:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Moretti",
"S.",
"",
"University of Southampton"
],
[
"Munir",
"S.",
"",
"University of Southampton"
],
[
"Poulose",
"P.",
"",
"University of Southampton"
]
] | The MSSM with explicit CP violation is studied through the di-photon decay channel of the lightest neutral Higgs boson. Through the leading one-loop order H1 --> gammar.gamma is affected by a large number of Higgs-sparticle couplings, which could be complex. Our preliminary scan over the Supersymmetric parameter space shows that more than 50% average deviations are possible, in either direction, in the corresponding branching ratio, with respect to the case of the CP-conserving MSSM. In particular, our analysis shows that in the presence of a light stop (with mass ~ 200 GeV) a CP-violating phase Arg(mu) ~ 90(deg) can render the H1 --> gamma.gamma branching ratio more than 10 times larger, for suitable combinations of the other MSSM parameters. |
hep-ph/0312034 | Holger Gies | Holger Gies, Joerg Jaeckel, Christof Wetterich (Heidelberg U.) | Towards a renormalizable standard model without fundamental Higgs scalar | 18 pages, 4 figures | Phys.Rev. D69 (2004) 105008 | 10.1103/PhysRevD.69.105008 | HD-THEP-03-60 | hep-ph hep-th | null | We investigate the possibility of constructing a renormalizable standard
model with purely fermionic matter content. The Higgs scalar is replaced by
point-like fermionic self-interactions with couplings growing large at the
Fermi scale. An analysis of the UV behavior in the point-like approximation
reveals a variety of non-Gaussian fixed points for the fermion couplings. If
real, such fixed points would imply nonperturbative renormalizability and evade
triviality of the Higgs sector. For point-like fermionic self-interactions and
weak gauge couplings, one encounters a hierarchy problem similar to the one for
a fundamental Higgs scalar.
| [
{
"created": "Tue, 2 Dec 2003 16:02:04 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gies",
"Holger",
"",
"Heidelberg U."
],
[
"Jaeckel",
"Joerg",
"",
"Heidelberg U."
],
[
"Wetterich",
"Christof",
"",
"Heidelberg U."
]
] | We investigate the possibility of constructing a renormalizable standard model with purely fermionic matter content. The Higgs scalar is replaced by point-like fermionic self-interactions with couplings growing large at the Fermi scale. An analysis of the UV behavior in the point-like approximation reveals a variety of non-Gaussian fixed points for the fermion couplings. If real, such fixed points would imply nonperturbative renormalizability and evade triviality of the Higgs sector. For point-like fermionic self-interactions and weak gauge couplings, one encounters a hierarchy problem similar to the one for a fundamental Higgs scalar. |
hep-ph/9503437 | Aharon Levy | Halina Abramowicz, Leonid Frankfurt, Mark Strikman | Interplay of Hard and Soft Physics in Small $x$ Deep Inelastic Processes | 1 figure updated, comments added, some numerical coefficients are
corrected (to appear in SLAC summer school, 1994) | ECONFC940808:033,1994; SurveysHighEnerg.Phys.11:51-95,1997 | null | DESY 95-047 | hep-ph | null | Coherence phenomena, the increase with energy of coherence length and the
non-universality of parton structure of the effective Pomeron are explained.
New hard phenomena directly calculable in QCD such as diffractive
electroproduction of states with $M^2\ll Q^2$ and the color transparency
phenomenon as well as new options to measure the light-cone wave functions of
various hadrons are considered. An analogue of Bjorken scaling is predicted for
the diffractive electroproduction of $\rho$ mesons at large momentum transfers
and for the production of large rapidity gap events, as observed at HERA. A
phenomenological QCD evolution equation is suggested to calculate the basic
characteristics of the large rapidity gap events. The increase of parton
densities at small $x$ as well as new means to disentangle experimentally soft
and hard physics are considered. We discuss constraints on the increase of deep
inelastic amplitudes with $Q^2$ derived from the inconsistency of QCD
predictions for inclusive and exclusive processes and from unitarity of the S
matrix for collisions of wave packets. New ways to probe QCD physics of hard
processes at large longitudinal distances and to answer the long standing
problems on the origin of the Pomeron are suggested. Unresolved problems and
perspectives of small $x$ physics are also outlined.
| [
{
"created": "Sun, 26 Mar 1995 14:36:07 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 1995 19:17:31 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Oct 1995 13:33:38 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Abramowicz",
"Halina",
""
],
[
"Frankfurt",
"Leonid",
""
],
[
"Strikman",
"Mark",
""
]
] | Coherence phenomena, the increase with energy of coherence length and the non-universality of parton structure of the effective Pomeron are explained. New hard phenomena directly calculable in QCD such as diffractive electroproduction of states with $M^2\ll Q^2$ and the color transparency phenomenon as well as new options to measure the light-cone wave functions of various hadrons are considered. An analogue of Bjorken scaling is predicted for the diffractive electroproduction of $\rho$ mesons at large momentum transfers and for the production of large rapidity gap events, as observed at HERA. A phenomenological QCD evolution equation is suggested to calculate the basic characteristics of the large rapidity gap events. The increase of parton densities at small $x$ as well as new means to disentangle experimentally soft and hard physics are considered. We discuss constraints on the increase of deep inelastic amplitudes with $Q^2$ derived from the inconsistency of QCD predictions for inclusive and exclusive processes and from unitarity of the S matrix for collisions of wave packets. New ways to probe QCD physics of hard processes at large longitudinal distances and to answer the long standing problems on the origin of the Pomeron are suggested. Unresolved problems and perspectives of small $x$ physics are also outlined. |
hep-ph/0106274 | Michael Klasen | M. Klasen | Status of Hard Interactions (Jets and Heavy Flavor) | Opening plenary talk presented at DIS 2001, Bologna, April 2001. 12
pages, 9 figures | null | 10.1142/9789812778345_0004 | DESY 01-089 | hep-ph | null | We review the status of hard interactions, in particular of jet and heavy
flavor production, at HERA and LEP. Emphasis is given to recent theoretical
developments. Instantons, event shapes, and prompt photons are also briefly
discussed.
| [
{
"created": "Mon, 25 Jun 2001 13:44:59 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2001 11:25:12 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Klasen",
"M.",
""
]
] | We review the status of hard interactions, in particular of jet and heavy flavor production, at HERA and LEP. Emphasis is given to recent theoretical developments. Instantons, event shapes, and prompt photons are also briefly discussed. |
hep-ph/0406029 | Marc Chemtob | Marc Chemtob | Phenomenological constraints on broken R parity symmetry in
supersymmetry models | 91 pages, Latex file, 4 figure in postsript files, to be published in
"Prog. Part. Nucl. Phys." | Prog.Part.Nucl.Phys.54:71-191,2005 | 10.1016/j.ppnp.2004.06.001 | null | hep-ph | null | The R parity odd renormalizable Yukawa interactions of quarks and leptons
with the scalar superpartners have the ability to violate the baryon and lepton
numbers, change the hadron and lepton flavors and make the lightest
supersymmetric particle unstable. The existence of an approximate R parity
symmetry would thus affect in a deep way the conventional framework of the
Minimal Supersymmetric Standard Model where an exact R parity symmetry is
built-in by assumption. The purpose of the present review is to survey in a
systematic way the direct experimental constraints set on the R parity
violating couplings by the low and intermediate energy physics processes. We
consider first the option of bilinear R parity violation and spontaneously
broken R parity symmetry and proceed next to the trilinear R parity violating
interactions. The discussion aims at surveying the indirect coupling constant
bounds derived from fundamental tests of the Standard Model and the variety of
scattering and rare decay processes. We also discuss the constraints imposed by
the renormalization group scale evolution and the cosmological and
astrophysical phenomenology.
| [
{
"created": "Wed, 2 Jun 2004 17:18:22 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Chemtob",
"Marc",
""
]
] | The R parity odd renormalizable Yukawa interactions of quarks and leptons with the scalar superpartners have the ability to violate the baryon and lepton numbers, change the hadron and lepton flavors and make the lightest supersymmetric particle unstable. The existence of an approximate R parity symmetry would thus affect in a deep way the conventional framework of the Minimal Supersymmetric Standard Model where an exact R parity symmetry is built-in by assumption. The purpose of the present review is to survey in a systematic way the direct experimental constraints set on the R parity violating couplings by the low and intermediate energy physics processes. We consider first the option of bilinear R parity violation and spontaneously broken R parity symmetry and proceed next to the trilinear R parity violating interactions. The discussion aims at surveying the indirect coupling constant bounds derived from fundamental tests of the Standard Model and the variety of scattering and rare decay processes. We also discuss the constraints imposed by the renormalization group scale evolution and the cosmological and astrophysical phenomenology. |
1310.6649 | Alan R. White | Alan R. White | The Potential Importance of Low Luminosity and High Energy at the LHC | Presented at the XLIIIrd International Symposium on Multiparticle
Dynamics, Chicago, Il USA | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low luminosity runs at higher LHC energy could provide definitive evidence
for an electroweak scale sextet quark sector of QCD that produces electroweak
symmetry breaking and dark matter within the bound-state S-Matrix of QUD - a
massless, weak coupling, infra-red fixed-point, SU(5) field theory that might
underly and unify the full Standard Model.
| [
{
"created": "Thu, 24 Oct 2013 15:47:37 GMT",
"version": "v1"
}
] | 2013-10-25 | [
[
"White",
"Alan R.",
""
]
] | Low luminosity runs at higher LHC energy could provide definitive evidence for an electroweak scale sextet quark sector of QCD that produces electroweak symmetry breaking and dark matter within the bound-state S-Matrix of QUD - a massless, weak coupling, infra-red fixed-point, SU(5) field theory that might underly and unify the full Standard Model. |
1906.10698 | Stefano Forte | The NNPDF Collaboration: Rabah Abdul Khalek, Richard D. Ball, Stefano
Carrazza, Stefano Forte, Tommaso Giani, Zahari Kassabov, Rosalyn L. Pearson,
Emanuele R. Nocera, Juan Rojo, Luca Rottoli, Maria Ubiali, Cameron Voisey and
Michael Wilson | Parton Distributions with Theory Uncertainties: General Formalism and
First Phenomenological Studies | 73 pages, 27 figures. Final version, to be published in EPJC.
Numerous changes and improvements including: discussion of phi added, Eq.s
6.3-6.5 and revised Tab 6.2 & 6.4; improved Figs 7.1-7.3; revised Sect. 81;
revised Figs. B.1-B.4 | null | null | Edinburgh 2019/9, Nikhef/2019-014, TIF-UNIMI-2019-9 DAMTP-2019-24,
CAVENDISH-HEP-19-11 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate a general approach to the inclusion of theoretical
uncertainties, specifically those related to the missing higher order
uncertainty (MHOU), in the determination of parton distribution functions
(PDFs). We demonstrate how, under quite generic assumptions, theory
uncertainties can be included as an extra contribution to the covariance matrix
when determining PDFs from data. We then review, clarify, and systematize the
use of renormalization and factorization scale variations as a means to
estimate MHOUs consistently in deep inelastic and hadronic processes. We define
a set of prescriptions for constructing a theory covariance matrix using scale
variations, which can be used in global fits of data from a wide range of
different processes, based on choosing a set of independent scale variations
suitably correlated within and across processes. We set up an algebraic
framework for the choice and validation of an optimal prescription by comparing
the estimate of MHOU encoded in the next-to-leading order (NLO) theory
covariance matrix to the observed shifts between NLO and NNLO predictions. We
perform a NLO PDF determination which includes the MHOU, assess the impact of
the inclusion of MHOUs on the PDF central values and uncertainties, and
validate the results by comparison to the known shift between NLO and NNLO
PDFs. We finally study the impact of the inclusion of MHOUs in a global PDF
determination on LHC cross-sections, and provide guidelines for their use in
precision phenomenology. In addition, we also compare the results based on the
theory covariance matrix formalism to those obtained by performing PDF
determinations based on different scale choices.
| [
{
"created": "Tue, 25 Jun 2019 18:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Oct 2019 17:09:41 GMT",
"version": "v2"
}
] | 2019-10-18 | [
[
"The NNPDF Collaboration",
"",
""
],
[
"Khalek",
"Rabah Abdul",
""
],
[
"Ball",
"Richard D.",
""
],
[
"Carrazza",
"Stefano",
""
],
[
"Forte",
"Stefano",
""
],
[
"Giani",
"Tommaso",
""
],
[
"Kassabov",
"Zahari",... | We formulate a general approach to the inclusion of theoretical uncertainties, specifically those related to the missing higher order uncertainty (MHOU), in the determination of parton distribution functions (PDFs). We demonstrate how, under quite generic assumptions, theory uncertainties can be included as an extra contribution to the covariance matrix when determining PDFs from data. We then review, clarify, and systematize the use of renormalization and factorization scale variations as a means to estimate MHOUs consistently in deep inelastic and hadronic processes. We define a set of prescriptions for constructing a theory covariance matrix using scale variations, which can be used in global fits of data from a wide range of different processes, based on choosing a set of independent scale variations suitably correlated within and across processes. We set up an algebraic framework for the choice and validation of an optimal prescription by comparing the estimate of MHOU encoded in the next-to-leading order (NLO) theory covariance matrix to the observed shifts between NLO and NNLO predictions. We perform a NLO PDF determination which includes the MHOU, assess the impact of the inclusion of MHOUs on the PDF central values and uncertainties, and validate the results by comparison to the known shift between NLO and NNLO PDFs. We finally study the impact of the inclusion of MHOUs in a global PDF determination on LHC cross-sections, and provide guidelines for their use in precision phenomenology. In addition, we also compare the results based on the theory covariance matrix formalism to those obtained by performing PDF determinations based on different scale choices. |
1511.08202 | Peter Tsang | H. M. Fried, P. H. Tsang, Y. Gabellini, T. Grandou, and Y-M. Sheu | A new approach to analytic, non-perturbative, gauge-invariant QCD
renormalization is described, with applications to high energy elastic
pp-scattering | Conference proceedings for 4th International Conference on New
Frontiers in Physics, ICNFP2015. Greece, 2015. subsequent work of Ann. Phys.
359, (2015); or arXiv:1412.2072, and arXiv:1502.04378 | null | 10.1051/epjconf/201612604050 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new non-perturbative, gauge-invariant model QCD renormalization is applied
to high energy elastic pp-scattering. The differential cross-section deduced
from this model displays a diffraction dip that resembles those of experiments.
Comparison with ISR and LHC data is currently underway.
| [
{
"created": "Wed, 25 Nov 2015 20:55:55 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Fried",
"H. M.",
""
],
[
"Tsang",
"P. H.",
""
],
[
"Gabellini",
"Y.",
""
],
[
"Grandou",
"T.",
""
],
[
"Sheu",
"Y-M.",
""
]
] | A new non-perturbative, gauge-invariant model QCD renormalization is applied to high energy elastic pp-scattering. The differential cross-section deduced from this model displays a diffraction dip that resembles those of experiments. Comparison with ISR and LHC data is currently underway. |
hep-ph/0006216 | Rusko Ruskov | A.P. Bakulev (Dubna, JINR), S.V. Mikhailov (Dubna, JINR), R. Ruskov
(Dubna, JINR) | New shapes of the rho-meson light-cone distribution amplitudes: how can
they influence the B --> rho e nu decay form factors | 5 pages, LaTeX (2 eps figures, JHEP.cls, epsfig), Contribution to
proceedings of the 5-th workshop on Heavy Quark Physics, Dubna, Russia, 6-8
April 2000, Corrected typos | null | null | null | hep-ph | null | We present new models of the rho-meson leading-twist light-cone distribution
amplitudes based on the QCD sum rule approach with nonlocal condensates. Their
shapes differ noticeably from that known in the literature. The
phenomenological consequences for physically important process B --> rho e nu
are discussed in the framework of the light-cone sum rules. The results are
compared with those found recently by P.Ball and V.M.Braun (1997).
| [
{
"created": "Mon, 19 Jun 2000 09:37:29 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2000 16:30:42 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bakulev",
"A. P.",
"",
"Dubna, JINR"
],
[
"Mikhailov",
"S. V.",
"",
"Dubna, JINR"
],
[
"Ruskov",
"R.",
"",
"Dubna, JINR"
]
] | We present new models of the rho-meson leading-twist light-cone distribution amplitudes based on the QCD sum rule approach with nonlocal condensates. Their shapes differ noticeably from that known in the literature. The phenomenological consequences for physically important process B --> rho e nu are discussed in the framework of the light-cone sum rules. The results are compared with those found recently by P.Ball and V.M.Braun (1997). |
hep-ph/0408359 | Anton Rebhan | A. Gerhold, A. Ipp, A. Rebhan | Anomalous specific heat in ultradegenerate QED and QCD | 5 pages, 3 figures, contribution to the Proceedings of Strong and
Electroweak Matter 2004 (SEWM04), Helsinki, Finland, 16-19 Jun 2004 | null | 10.1142/9789812702159_0065 | TUW-04-25 | hep-ph | null | We discuss the origin of the anomalous $T\ln T^{-1}$ behavior of the
low-temperature entropy and specific heat in ultradegenerate QED and QCD and
report on a recent calculation which is complete to leading order in the
coupling and which contains an infinite series of anomalous terms involving
also fractional powers in $T$. This result involves dynamical hard-dense-loop
resummation and interpolates between Debye screening effects at larger
temperatures and non-Fermi-liquid behavior from only dynamically screened
magnetic fields at low temperature.
| [
{
"created": "Tue, 31 Aug 2004 18:33:57 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Gerhold",
"A.",
""
],
[
"Ipp",
"A.",
""
],
[
"Rebhan",
"A.",
""
]
] | We discuss the origin of the anomalous $T\ln T^{-1}$ behavior of the low-temperature entropy and specific heat in ultradegenerate QED and QCD and report on a recent calculation which is complete to leading order in the coupling and which contains an infinite series of anomalous terms involving also fractional powers in $T$. This result involves dynamical hard-dense-loop resummation and interpolates between Debye screening effects at larger temperatures and non-Fermi-liquid behavior from only dynamically screened magnetic fields at low temperature. |
1506.04409 | Shoaib Munir | Rikard Enberg, William Klemm, Stefano Moretti, Shoaib Munir, Glenn
Wouda | $H^\pm$ in the $W^\pm h$ channel at the LHC Run 2 | 4 pages, 1 table, 2 figures - Talk given at the Toyama International
Workshop on Higgs as a Probe of New Physics 2015, 11-15 February, 2015,
Toyama, Japan | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the discovery prospects of the charged Higgs boson, $H^\pm$, via
its decay in the $W^\pm h$ channel in the minimal supersymmetric Standard Model
(MSSM) as well as several 2-Higgs Doublet Models (2HDMs). $h$, the lightest
scalar Higgs boson in these models, is identified with the recently discovered
$\sim 125$ GeV state, $H_\text{obs}$, at the Large Hadron Collider (LHC). We
find that, while it provides an important input in the kinematic selection of
signal events, the measured $H_\text{obs}$ mass renders this channel
inaccessible in the MSSM. In the 2HDMs though, through a dedicated
signal-to-background analysis for the $pp\to t(\bar{b})H^-\to \ell^\pm\nu_\ell
jj bb\bar{b}(\bar{b})$+h.c process, we establish that some parameter space
regions will be testable at the LHC with $\sqrt{s}=14$ TeV.
| [
{
"created": "Sun, 14 Jun 2015 15:59:58 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Enberg",
"Rikard",
""
],
[
"Klemm",
"William",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Munir",
"Shoaib",
""
],
[
"Wouda",
"Glenn",
""
]
] | We analyse the discovery prospects of the charged Higgs boson, $H^\pm$, via its decay in the $W^\pm h$ channel in the minimal supersymmetric Standard Model (MSSM) as well as several 2-Higgs Doublet Models (2HDMs). $h$, the lightest scalar Higgs boson in these models, is identified with the recently discovered $\sim 125$ GeV state, $H_\text{obs}$, at the Large Hadron Collider (LHC). We find that, while it provides an important input in the kinematic selection of signal events, the measured $H_\text{obs}$ mass renders this channel inaccessible in the MSSM. In the 2HDMs though, through a dedicated signal-to-background analysis for the $pp\to t(\bar{b})H^-\to \ell^\pm\nu_\ell jj bb\bar{b}(\bar{b})$+h.c process, we establish that some parameter space regions will be testable at the LHC with $\sqrt{s}=14$ TeV. |
2005.00354 | Amruta Mishra | Amruta Mishra and S.P.Misra | Open charm and charmonium states in strong magnetic fields | 25 pages, 3 figures, version to be published in Int. Jour. Mod. Phys.
E. arXiv admin note: text overlap with arXiv:2004.01007, arXiv:2006.03478 | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass modifications of the open charm ($D$ and $D^*$) mesons, and their
effects on the decay widths $D^*\rightarrow D\pi$ as well as of the charmonium
state, $\Psi(3770)$ to open charm mesons ($\Psi(3770)\rightarrow D\bar D$), are
investigated in the presence of strong magnetic fields. These are studied
accounting for the mixing of the pseudoscalar ($P$) and vector ($V$) mesons
($D-D^*$, $\eta_c'-\Psi(3770)$ mixings), with the mixing parameter, $g_{PV}$ of
a phenomenological three-point ($PV\gamma$) vertex interaction determined from
the observed radiative decay width of $V\rightarrow P\gamma$. For charged
$D-D^*$ mixing, this parameter is dependent on the magnetic field, because of
the Landau level contributions to the vacuum masses of these mesons. The masses
of the charged $D$ and $D^*$ mesons modified due to $PV$ mixing, in addition,
have contributions from the lowest Landau levels in the presence of a strong
magnetic field. The effects of the magnetic field on the decay widths are
studied using a field theoretic model of composite hadrons with quark (and
antiquark) consittuents. The parameter for the charged $D-D^*$ mixing is
observed to increase appreciably with increase in the magnetic field. This
leads to dominant modifications to their masses, and hence the decay widths of
charged $D^*\rightarrow D\pi$ as well as $\Psi(3770)\rightarrow D^+D^-$ at
large values of the magnetic field. The modifications of the masses and decay
widths of the open and hidden charm mesons in the presence of strong magnetic
fields should have observable consequences on the production of the open charm
($D$ and $D^*$) mesons as well as of the charmonium states resulting from
non-central ultrarelativistic heavy ion collision experiments.
| [
{
"created": "Thu, 30 Apr 2020 17:21:04 GMT",
"version": "v1"
},
{
"created": "Fri, 14 May 2021 04:21:07 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Jul 2021 04:39:54 GMT",
"version": "v3"
}
] | 2021-07-20 | [
[
"Mishra",
"Amruta",
""
],
[
"Misra",
"S. P.",
""
]
] | The mass modifications of the open charm ($D$ and $D^*$) mesons, and their effects on the decay widths $D^*\rightarrow D\pi$ as well as of the charmonium state, $\Psi(3770)$ to open charm mesons ($\Psi(3770)\rightarrow D\bar D$), are investigated in the presence of strong magnetic fields. These are studied accounting for the mixing of the pseudoscalar ($P$) and vector ($V$) mesons ($D-D^*$, $\eta_c'-\Psi(3770)$ mixings), with the mixing parameter, $g_{PV}$ of a phenomenological three-point ($PV\gamma$) vertex interaction determined from the observed radiative decay width of $V\rightarrow P\gamma$. For charged $D-D^*$ mixing, this parameter is dependent on the magnetic field, because of the Landau level contributions to the vacuum masses of these mesons. The masses of the charged $D$ and $D^*$ mesons modified due to $PV$ mixing, in addition, have contributions from the lowest Landau levels in the presence of a strong magnetic field. The effects of the magnetic field on the decay widths are studied using a field theoretic model of composite hadrons with quark (and antiquark) consittuents. The parameter for the charged $D-D^*$ mixing is observed to increase appreciably with increase in the magnetic field. This leads to dominant modifications to their masses, and hence the decay widths of charged $D^*\rightarrow D\pi$ as well as $\Psi(3770)\rightarrow D^+D^-$ at large values of the magnetic field. The modifications of the masses and decay widths of the open and hidden charm mesons in the presence of strong magnetic fields should have observable consequences on the production of the open charm ($D$ and $D^*$) mesons as well as of the charmonium states resulting from non-central ultrarelativistic heavy ion collision experiments. |
hep-ph/9310376 | null | Sumantra Chakravarty, Sun Myong Kim, and Pyungwon Ko | Final-state \pi\pi interactions in
\Upsilon(3S)\rightarrow\Upsilon(1S)\pi\pi | REVTeX, 13 pages and 6 figures available upon request, UMN-TH-1207/93 | Phys.Rev. D50 (1994) 389-394 | 10.1103/PhysRevD.50.389 | null | hep-ph | null | The $m_{\pi\pi}$ spectrum and various angular distributions in $\upss$ are
studied including the effects of the $\pi\pi$ phase shift in the $I=L=0$
channel using the lowest order amplitude in the pion momentum expansion. Our
results are compared with the recent CLEO data, and we find good agreement
except for the $\cos\theta_{\pi}^*$ distributions. We argue that the
$\cos\theta_{\pi}^*$ distribution, contrary to other distributions, is
sensitive to the higher order corrections in the pion momentum expansion. This
argument is supported by using an ansatz for the amplitude which is of higher
order in the pion momentum expansion and still satisfies the soft pion theorem.
| [
{
"created": "Fri, 29 Oct 1993 20:11:22 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Chakravarty",
"Sumantra",
""
],
[
"Kim",
"Sun Myong",
""
],
[
"Ko",
"Pyungwon",
""
]
] | The $m_{\pi\pi}$ spectrum and various angular distributions in $\upss$ are studied including the effects of the $\pi\pi$ phase shift in the $I=L=0$ channel using the lowest order amplitude in the pion momentum expansion. Our results are compared with the recent CLEO data, and we find good agreement except for the $\cos\theta_{\pi}^*$ distributions. We argue that the $\cos\theta_{\pi}^*$ distribution, contrary to other distributions, is sensitive to the higher order corrections in the pion momentum expansion. This argument is supported by using an ansatz for the amplitude which is of higher order in the pion momentum expansion and still satisfies the soft pion theorem. |
2111.00322 | Manimala Chakraborti | Manimala Chakraborti, Sven Heinemeyer and Ipsita Saha | SUSY in the light of the new "MUON G-2" Result | 6 pages, 2 figures, contribution to the proceedings of the
EPS-HEP2021 conference, submitted to PoS. arXiv admin note: substantial text
overlap with arXiv:2105.06408 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently published result from the Fermilab "MUON G-2" experiment has
confirmed the persistent 3-4 $\sigma$ discrepancy between the experimental
result from BNL for the anomalous magnetic moment of the muon, $(g-2)_\mu$ ,
and its Standard Model (SM) prediction. The combination of the two measurements
yields a deviation of 4.2 $\sigma$ from the SM value. Here, we review the
parameter space of the electroweak (EW) sector of the Minimal Supersymmetric
Standard Model (MSSM), that can accommodate the anomaly while being in full
agreement with other experimental data, particularly the direct searches for EW
particles at the LHC and dark matter (DM) relic density and direct detection
constraints. We find that the combined constraints set an upper limit of ~ 600
GeV for the LSP and NLSP masses establishing clear targets for the future
collider searches.
| [
{
"created": "Sat, 30 Oct 2021 19:53:06 GMT",
"version": "v1"
}
] | 2021-11-02 | [
[
"Chakraborti",
"Manimala",
""
],
[
"Heinemeyer",
"Sven",
""
],
[
"Saha",
"Ipsita",
""
]
] | The recently published result from the Fermilab "MUON G-2" experiment has confirmed the persistent 3-4 $\sigma$ discrepancy between the experimental result from BNL for the anomalous magnetic moment of the muon, $(g-2)_\mu$ , and its Standard Model (SM) prediction. The combination of the two measurements yields a deviation of 4.2 $\sigma$ from the SM value. Here, we review the parameter space of the electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM), that can accommodate the anomaly while being in full agreement with other experimental data, particularly the direct searches for EW particles at the LHC and dark matter (DM) relic density and direct detection constraints. We find that the combined constraints set an upper limit of ~ 600 GeV for the LSP and NLSP masses establishing clear targets for the future collider searches. |
2106.13855 | Zhuo-Ran Huang | Zhuo-Ran Huang, Emi Kou, Cai-Dian L\"u and Ru-Ying Tang | Unbinned Angular Analysis of $B\to D^*\ell \nu_\ell$ and the
Right-handed Current | 7 pages,2 figures; version accepted by PRD | null | 10.1103/PhysRevD.105.013010 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we perform a sensitivity study of an unbinned angular
analysis of the $B\to D^*\ell \nu_\ell$ decay, including the contributions from
the right-handed current. We show that the angular observable can constrain
very strongly the right-handed current without the intervention of the yet
unsolved $V_{cb}$ puzzle.
| [
{
"created": "Fri, 25 Jun 2021 19:27:01 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jan 2022 12:37:50 GMT",
"version": "v2"
}
] | 2022-02-02 | [
[
"Huang",
"Zhuo-Ran",
""
],
[
"Kou",
"Emi",
""
],
[
"Lü",
"Cai-Dian",
""
],
[
"Tang",
"Ru-Ying",
""
]
] | In this article, we perform a sensitivity study of an unbinned angular analysis of the $B\to D^*\ell \nu_\ell$ decay, including the contributions from the right-handed current. We show that the angular observable can constrain very strongly the right-handed current without the intervention of the yet unsolved $V_{cb}$ puzzle. |
hep-ph/0405087 | Bo-Qiang Ma | Mu-Lin Yan, Si Li, Bin Wu, Bo-Qiang Ma | Baryonium with a phenomenological skyrmion-type potential | 6 LaTex pages, 2 figures. Final version in journal publication | Phys. Rev. D 72 (2005) 034027 | 10.1103/PhysRevD.72.034027 | null | hep-ph hep-ex nucl-ex nucl-th quant-ph | null | In this paper, we investigate the nucleon-antinucleon static energies in the
Skyrme model with the product {\it Anzatz}. The calculation shows that in the
ungroomed $S\bar S$ (skyrmion and antiskyrmion) channel, which leads to rapid
annihilation, there exists a quasi-stable bound state which may give a natural
explanation for the near-threshold enhancement in the proton-antiproton
$(p\bar{p})$ mass spectrum reported by the BES Collaboration and the Belle
Collaboration. Similar to the phenomenological well potential of the deuteron,
we construct a phenomenological skyrmion-type potential to study this narrow
$p\bar{p}$-resonance in $ J/\psi\to \gamma p\bar{p}$. By this potential model,
a $p\bar{p}$ baryonium with small binding energies is suggested and the decay
width of this state is calculated by WKB approximation. In this picture the
decay is attributed to quantum tunnelling and $p\bar{p}$ annihilation.
Prediction on the decay mode from the baryonium annihilation at rest is also
pointed out.
| [
{
"created": "Mon, 10 May 2004 23:12:31 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 2004 22:53:30 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Aug 2005 04:20:14 GMT",
"version": "v3"
},
{
"created": "Wed, 31 Aug 2005 02:00:38 GMT",
"version": "v4"
}
] | 2012-06-26 | [
[
"Yan",
"Mu-Lin",
""
],
[
"Li",
"Si",
""
],
[
"Wu",
"Bin",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | In this paper, we investigate the nucleon-antinucleon static energies in the Skyrme model with the product {\it Anzatz}. The calculation shows that in the ungroomed $S\bar S$ (skyrmion and antiskyrmion) channel, which leads to rapid annihilation, there exists a quasi-stable bound state which may give a natural explanation for the near-threshold enhancement in the proton-antiproton $(p\bar{p})$ mass spectrum reported by the BES Collaboration and the Belle Collaboration. Similar to the phenomenological well potential of the deuteron, we construct a phenomenological skyrmion-type potential to study this narrow $p\bar{p}$-resonance in $ J/\psi\to \gamma p\bar{p}$. By this potential model, a $p\bar{p}$ baryonium with small binding energies is suggested and the decay width of this state is calculated by WKB approximation. In this picture the decay is attributed to quantum tunnelling and $p\bar{p}$ annihilation. Prediction on the decay mode from the baryonium annihilation at rest is also pointed out. |
1708.01067 | Sergey Alekhin | S. Alekhin, J. Bl\"umlein, S. Moch | Strange sea determination from collider data | 13 pages, 7 figures | null | 10.1016/j.physletb.2017.12.024 | DESY 17-114 DO-TH 17/17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider determinations of the strange sea in the nucleon based on the QCD
analyses of data collected at the LHC with focus on the recent high-statistics
ATLAS measurement of the $W^\pm$- and $Z$-boson production. We study the effect
of different functional forms for parameterization of the parton distribution
functions and the combination of various data sets in the analysis. We compare
to earlier strange sea determinations and discuss ways to improve them in the
future.
| [
{
"created": "Thu, 3 Aug 2017 09:22:17 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Alekhin",
"S.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Moch",
"S.",
""
]
] | We consider determinations of the strange sea in the nucleon based on the QCD analyses of data collected at the LHC with focus on the recent high-statistics ATLAS measurement of the $W^\pm$- and $Z$-boson production. We study the effect of different functional forms for parameterization of the parton distribution functions and the combination of various data sets in the analysis. We compare to earlier strange sea determinations and discuss ways to improve them in the future. |
2002.02340 | Kai Yan | Christoph Dlapa, Johannes Henn, Kai Yan | Deriving canonical differential equations for Feynman integrals from a
single uniform weight integral | 22 pages, 5 figures, 1 table | null | 10.1007/JHEP05(2020)025 | MPP-2020-10 | hep-ph hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Differential equations are a powerful tool for evaluating Feynman integrals.
Their solution is straightforward if a transformation to a canonical form is
found. In this paper, we present an algorithm for finding such a
transformation. This novel technique is based on a method due to Hoschele et
al. and relies only on the knowledge of a single integral of uniform
transcendental weight. As a corollary, the algorithm can also be used to test
the uniform transcendentality of a given integral. We discuss the application
to several cutting-edge examples, including non-planar four-loop HQET and
non-planar two-loop five-point integrals. A Mathematica implementation of our
algorithm is made available together with this paper.
| [
{
"created": "Thu, 6 Feb 2020 16:39:28 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Dlapa",
"Christoph",
""
],
[
"Henn",
"Johannes",
""
],
[
"Yan",
"Kai",
""
]
] | Differential equations are a powerful tool for evaluating Feynman integrals. Their solution is straightforward if a transformation to a canonical form is found. In this paper, we present an algorithm for finding such a transformation. This novel technique is based on a method due to Hoschele et al. and relies only on the knowledge of a single integral of uniform transcendental weight. As a corollary, the algorithm can also be used to test the uniform transcendentality of a given integral. We discuss the application to several cutting-edge examples, including non-planar four-loop HQET and non-planar two-loop five-point integrals. A Mathematica implementation of our algorithm is made available together with this paper. |
2012.15174 | Ligong Bian | Xin Deng, Xuewen Liu, Jing Yang, Ruiyu Zhou, and Ligong Bian | Heavy dark matter and Gravitational waves | 8 pages, 4 figures, comments welcome! | Phys. Rev. D 103, 055013 (2021) | 10.1103/PhysRevD.103.055013 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Domain walls can form after breakdown of a discrete symmetry induced by
first-order phase transition, we study the heavy dark matter produced around
the temperature of the phase transition that yields the breakdown of a
$\mathbb{Z}_{3}$ symmetry. The generated gravitational waves by domain walls
decay is found to be able to probed by the Pulsar Timing Arrays, and the future
Square Kilometer Array.
| [
{
"created": "Wed, 30 Dec 2020 14:37:03 GMT",
"version": "v1"
}
] | 2021-03-24 | [
[
"Deng",
"Xin",
""
],
[
"Liu",
"Xuewen",
""
],
[
"Yang",
"Jing",
""
],
[
"Zhou",
"Ruiyu",
""
],
[
"Bian",
"Ligong",
""
]
] | Domain walls can form after breakdown of a discrete symmetry induced by first-order phase transition, we study the heavy dark matter produced around the temperature of the phase transition that yields the breakdown of a $\mathbb{Z}_{3}$ symmetry. The generated gravitational waves by domain walls decay is found to be able to probed by the Pulsar Timing Arrays, and the future Square Kilometer Array. |
2105.04306 | Takuya Morozumi | Apriadi Salim Adam, Nicholas J.Benoit, Yuta Kawamura, Yamato Matsuo,
Takuya Morozumi, Yusuke Shimizu, Yuya Tokunaga and Naoya Toyota | Lepton family numbers and non-relativistic Majorana neutrinos | 10 pages, 4figures, This paper is based on a talk in BSM-2021 online
international conference. In v2.,a factor 1/2 in Eq.(7) is corrected | null | null | HUPD-2101 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, we have reviewed the recent development on the time evolution
of lepton family number carried by Majorana neutrinos \cite{Adam:2021qiq}. This
article focuses on the subtle points of the derivation of the lepton family
numbers and their time evolution. We also show how the time evolution is
sensitive to $m_{ee}$ and $m_{e\mu}$ components of the effective Majorana mass
matrix by applying the formula to the two family case. The dependence on the
Majorana phase is clarified and the implication on CNB (cosmic neutrino
background) is also discussed.
| [
{
"created": "Mon, 10 May 2021 12:31:10 GMT",
"version": "v1"
},
{
"created": "Sat, 29 May 2021 02:47:20 GMT",
"version": "v2"
}
] | 2021-06-01 | [
[
"Adam",
"Apriadi Salim",
""
],
[
"Benoit",
"Nicholas J.",
""
],
[
"Kawamura",
"Yuta",
""
],
[
"Matsuo",
"Yamato",
""
],
[
"Morozumi",
"Takuya",
""
],
[
"Shimizu",
"Yusuke",
""
],
[
"Tokunaga",
"Yuya",
""
... | In this talk, we have reviewed the recent development on the time evolution of lepton family number carried by Majorana neutrinos \cite{Adam:2021qiq}. This article focuses on the subtle points of the derivation of the lepton family numbers and their time evolution. We also show how the time evolution is sensitive to $m_{ee}$ and $m_{e\mu}$ components of the effective Majorana mass matrix by applying the formula to the two family case. The dependence on the Majorana phase is clarified and the implication on CNB (cosmic neutrino background) is also discussed. |
hep-ph/0010130 | Richard Hill | Richard Hill | New Value of M_mu/M_e from Muonium Hyperfine Splitting | 6 pages, 1 figure, revtex. v2: minor clarifications; previously
calculated higher order recoil term included | Phys.Rev.Lett. 86 (2001) 3280-3283 | 10.1103/PhysRevLett.86.3280 | null | hep-ph | null | The complete contribution to the muonium hyperfine splitting of relative
order alpha^3(m_e/m_mu)ln(alpha) is calculated. The result amounts to 0.013
kHZ, much smaller than suggested by a previous estimate, and leads to a 2-sigma
shift of the most precise value for the muon-electron mass ratio, with the
error reduced by approximately 30%. Analogous contributions are calculated for
the positronium hyperfine splitting:
(217/90-17*ln{2}/3)m_e(alpha^7/pi)ln(1/alpha) \approx -0.32 MHz; the remaining
theoretical uncertainty should be well below experimental error, leaving
discrepancies of 2.5-sigma and 3.5-sigma with the two most precise
measurements.
| [
{
"created": "Fri, 13 Oct 2000 01:57:28 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2000 23:35:07 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Hill",
"Richard",
""
]
] | The complete contribution to the muonium hyperfine splitting of relative order alpha^3(m_e/m_mu)ln(alpha) is calculated. The result amounts to 0.013 kHZ, much smaller than suggested by a previous estimate, and leads to a 2-sigma shift of the most precise value for the muon-electron mass ratio, with the error reduced by approximately 30%. Analogous contributions are calculated for the positronium hyperfine splitting: (217/90-17*ln{2}/3)m_e(alpha^7/pi)ln(1/alpha) \approx -0.32 MHz; the remaining theoretical uncertainty should be well below experimental error, leaving discrepancies of 2.5-sigma and 3.5-sigma with the two most precise measurements. |
0807.3883 | Gautam Bhattacharyya | Gautam Bhattacharyya | Electroweak Symmetry Breaking and BSM Physics (A Review) | 17 pages, 10 eps figs, Based on plenary talks at the International
Conferences: WIN07, Kolkata, Jan'07, and WHEPP-10, Chennai, Jan'08. To appear
in the WHEPP-10 proceedings (a special issue of PRAMANA) | Pramana 72:37-54,2009 | 10.1007/s12043-009-0004-0 | SINP/TNP/2008/15, LPT-ORSAY 08-67 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I shall first discuss the standard model Higgs mechanism and
then highlight some of its deficiencies making a case for the need to go beyond
the standard model (BSM). The BSM tour will be guided by symmetry arguments. I
shall pick up four specific BSM scenarios, namely, supersymmetry, Little Higgs,
Gauge-Higgs unification, and the Higgsless approach. The discussion will be
confined mainly on their electroweak symmetry breaking aspects.
| [
{
"created": "Thu, 24 Jul 2008 13:44:11 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Bhattacharyya",
"Gautam",
""
]
] | In this talk, I shall first discuss the standard model Higgs mechanism and then highlight some of its deficiencies making a case for the need to go beyond the standard model (BSM). The BSM tour will be guided by symmetry arguments. I shall pick up four specific BSM scenarios, namely, supersymmetry, Little Higgs, Gauge-Higgs unification, and the Higgsless approach. The discussion will be confined mainly on their electroweak symmetry breaking aspects. |
hep-ph/9411360 | Khalil Shaaban | S.S.Khalil | Supersymmetric Magnetic Moments Sum Rules and Spontaneous Supersymmetry
Breaking | 10 pages, 3 figures ( not included ) | J.Phys. G21 (1995) 261-266 | 10.1088/0954-3899/21/3/003 | IC/94/280 | hep-ph | null | In supersymmetry the anomalous magnetic moment of particles belonging to the
same supermultiplet is related by simple sum rules. We study the modification
of these sum rules in the case of spontaneously broken N=1 global
supersymmetry.
| [
{
"created": "Tue, 22 Nov 1994 17:25:11 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Khalil",
"S. S.",
""
]
] | In supersymmetry the anomalous magnetic moment of particles belonging to the same supermultiplet is related by simple sum rules. We study the modification of these sum rules in the case of spontaneously broken N=1 global supersymmetry. |
2209.05890 | Snehashis Parashar | Snehashis Parashar, Anirban Karan, Avnish, Priyotosh Bandyopadhyay,
Kirtiman Ghosh | Phenomenology of Scalar Leptoquarks at the LHC in Explaining the
Radiative Neutrino Mass, Muon $g-2$ and Lepton Flavour Violating Observables | 49 pages, 33 figures and 18 tables | Phys.Rev.D 106 (2022) 9, 095040 | 10.1103/PhysRevD.106.095040 | IITH-PH-0004/22, IP/BBSR/2022-05 | hep-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We study the phenomenology of a particular leptoquark extension of the
Standard Model (SM), namely the doublet-singlet scalar leptoquark extension of
the SM (DSL-SM). Besides generating Majorana mass for neutrinos, these
leptoquarks contribute to muon and electron $(g-2)$ and various lepton flavour
violating processes. Collider signatures of the benchmark points (BPs),
consistent with the neutrino oscillation data, anomalous muon/electron magnetic
moments, experimental bounds on the charged lepton flavour violation
observables, etc., are studied at the LHC/FCC with centre-of-mass energies of
14, 27 and 100 TeV. While the two $-1/3$ charged colored scalars from singlet
and doublet leptoquark mix with each other, the charge $2/3$ colored scalar
from the doublet leptoquark remains pure. With a near-degenerate mass spectrum,
the pure and mixed leptoquark states are shown to be distinguishable from
multiple finalstates, while discerning between the two mixed states remain very
challenging.
| [
{
"created": "Tue, 13 Sep 2022 11:20:51 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2023 11:48:53 GMT",
"version": "v2"
}
] | 2023-01-16 | [
[
"Parashar",
"Snehashis",
""
],
[
"Karan",
"Anirban",
""
],
[
"Avnish",
"",
""
],
[
"Bandyopadhyay",
"Priyotosh",
""
],
[
"Ghosh",
"Kirtiman",
""
]
] | We study the phenomenology of a particular leptoquark extension of the Standard Model (SM), namely the doublet-singlet scalar leptoquark extension of the SM (DSL-SM). Besides generating Majorana mass for neutrinos, these leptoquarks contribute to muon and electron $(g-2)$ and various lepton flavour violating processes. Collider signatures of the benchmark points (BPs), consistent with the neutrino oscillation data, anomalous muon/electron magnetic moments, experimental bounds on the charged lepton flavour violation observables, etc., are studied at the LHC/FCC with centre-of-mass energies of 14, 27 and 100 TeV. While the two $-1/3$ charged colored scalars from singlet and doublet leptoquark mix with each other, the charge $2/3$ colored scalar from the doublet leptoquark remains pure. With a near-degenerate mass spectrum, the pure and mixed leptoquark states are shown to be distinguishable from multiple finalstates, while discerning between the two mixed states remain very challenging. |
hep-ph/0511233 | Stephen Reucroft | S. Reucroft, Y.N. Srivastava, J. Swain and A. Widom | High Mass Particles Near Threshold | 4 pages, 4 figures (.eps) | null | null | null | hep-ph hep-th | null | A consequence of the Higgs mechanism is that high mass particles, such as the
Z-boson, the W-boson and the t-quark, are predicted to have masses that depend
on the process by which they are produced. Thus, for example, particles
produced singly are predicted to have higher masses than those produced in a
pair near threshold. Quantitative details of this prediction are presented and
discussed within the context of the current experimental situation.
| [
{
"created": "Fri, 18 Nov 2005 19:58:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Reucroft",
"S.",
""
],
[
"Srivastava",
"Y. N.",
""
],
[
"Swain",
"J.",
""
],
[
"Widom",
"A.",
""
]
] | A consequence of the Higgs mechanism is that high mass particles, such as the Z-boson, the W-boson and the t-quark, are predicted to have masses that depend on the process by which they are produced. Thus, for example, particles produced singly are predicted to have higher masses than those produced in a pair near threshold. Quantitative details of this prediction are presented and discussed within the context of the current experimental situation. |
1708.08938 | Sunando Patra | Aritra Biswas, Sunando Kumar Patra, Avirup Shaw | $\mathcal{R}(D^{(*)})$ anomalies in light of Non-Minimal Universal Extra
Dimension | 14 pages, 7 captioned figures, Some clarifications and corrections
added (Version accepted in PRD) | Phys. Rev. D 97, 035019 (2018) | 10.1103/PhysRevD.97.035019 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate contributions from Kaluza-Klein excitations of gauge bosons and
physical charge scalar for the explanation of the lepton flavor universality
violating excess in the ratios $\mathcal{R}(D)$ and $\mathcal{R}(D^*)$ in 5
dimensional Universal Extra Dimensional scenario with non-vanishing boundary
localized terms. This model is conventionally known as non-minimal Universal
Extra Dimensional model. We obtain the allowed parameter space in accordance
with constraints coming from $B_c \to \tau \nu$ decay, as well as those from
the electroweak precision tests.
| [
{
"created": "Tue, 29 Aug 2017 18:00:52 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Sep 2017 16:09:46 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Feb 2018 16:30:59 GMT",
"version": "v3"
}
] | 2018-03-07 | [
[
"Biswas",
"Aritra",
""
],
[
"Patra",
"Sunando Kumar",
""
],
[
"Shaw",
"Avirup",
""
]
] | We estimate contributions from Kaluza-Klein excitations of gauge bosons and physical charge scalar for the explanation of the lepton flavor universality violating excess in the ratios $\mathcal{R}(D)$ and $\mathcal{R}(D^*)$ in 5 dimensional Universal Extra Dimensional scenario with non-vanishing boundary localized terms. This model is conventionally known as non-minimal Universal Extra Dimensional model. We obtain the allowed parameter space in accordance with constraints coming from $B_c \to \tau \nu$ decay, as well as those from the electroweak precision tests. |
2003.06187 | Mar\'ia Luisa L\'opez Ib\'a\~nez | Chengcheng Han, M.L. L\'opez-Ib\'a\~nez, Aurora Melis, \'Oscar Vives,
Lei Wu, Jin Min Yang | LFV and g-2 in non-universal SUSY models with light higgsinos | 27 pages, 9 figures | null | 10.1007/JHEP05(2020)102 | IFIC/20-10, FTUV-20-0313 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a supersymmetric type-I seesaw framework with non-universal
scalar masses at the GUT scale to explain the long-standing discrepancy of the
anomalous magnetic moment of the muon. We find that it is difficult to
accommodate the muon g-2 while keeping charged-lepton flavor violating
processes under control for the conventional SO(10)-based relation between the
up sector and neutrino sector. However, such tension can be relaxed by adding a
Georgi-Jarlskog factor for the Yukawa matrices, which requires a non-trivial
GUT-based model. In this model, we find that both observables are compatible
for small mixings, CKM-like, in the neutrino Dirac Yukawa matrix.
| [
{
"created": "Fri, 13 Mar 2020 10:20:54 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Han",
"Chengcheng",
""
],
[
"López-Ibáñez",
"M. L.",
""
],
[
"Melis",
"Aurora",
""
],
[
"Vives",
"Óscar",
""
],
[
"Wu",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
]
] | We consider a supersymmetric type-I seesaw framework with non-universal scalar masses at the GUT scale to explain the long-standing discrepancy of the anomalous magnetic moment of the muon. We find that it is difficult to accommodate the muon g-2 while keeping charged-lepton flavor violating processes under control for the conventional SO(10)-based relation between the up sector and neutrino sector. However, such tension can be relaxed by adding a Georgi-Jarlskog factor for the Yukawa matrices, which requires a non-trivial GUT-based model. In this model, we find that both observables are compatible for small mixings, CKM-like, in the neutrino Dirac Yukawa matrix. |
hep-ph/9708298 | Amparo Gil G\Smez | J. Segura (U. de Alicante) | Neutrino Oscillation and Magnetic Moment from $\nu - e^{-}$ Elastic
Scattering | 11 pages (Latex) + 2 figures (.ps) | Eur.Phys.J.C5:269-274,1998 | 10.1007/s100520050268 | MPI-PhT/96-93 | hep-ph | null | We discuss how the measurement of the $\bar{\nu}_{e}-e^{-}$ elastic cross
section at reactor energies can be used to extract new information on the
neutrino oscillation parameters. We also consider the magnetic moment
contribution and show how both effects tend to cancel each other when the total
cross section is measured; to achieve the separation of each of the effects,
experiments capable of measuring angular and energy distributions with respect
to the outgoing electron become necessary. We study how their different energy
and angle dependence enables such a separation; then, the sensitivity to
magnetic moments, masses and mixings is discussed. We also show how these
experiments can be sensitive to the magnetic moment of $\tau$ neutrinos via
$\bar{\nu}_{e}\leftrightarrow \bar{\nu}_{\mu}$ oscillation.
| [
{
"created": "Sun, 10 Aug 1997 17:13:10 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Segura",
"J.",
"",
"U. de Alicante"
]
] | We discuss how the measurement of the $\bar{\nu}_{e}-e^{-}$ elastic cross section at reactor energies can be used to extract new information on the neutrino oscillation parameters. We also consider the magnetic moment contribution and show how both effects tend to cancel each other when the total cross section is measured; to achieve the separation of each of the effects, experiments capable of measuring angular and energy distributions with respect to the outgoing electron become necessary. We study how their different energy and angle dependence enables such a separation; then, the sensitivity to magnetic moments, masses and mixings is discussed. We also show how these experiments can be sensitive to the magnetic moment of $\tau$ neutrinos via $\bar{\nu}_{e}\leftrightarrow \bar{\nu}_{\mu}$ oscillation. |
1209.1516 | Max Zoller | M. F. Zoller, K. G. Chetyrkin | OPE of the energy-momentum tensor correlator in massless QCD | v2: comments and appendix added, results are now available in
computer readable form; v3: JHEP version, extended discussion of the method
of projectors | JHEP 1212 (2012) 119 | 10.1007/JHEP12(2012)119 | TTP12-025; SFB/CPP-12-56 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically calculate higher order corrections to coefficient functions
of the operator product expansion (OPE) for the Euclidean correlator of two
energy-momentum tensors in massless QCD. These are the three-loop contribution
to the coefficient C_0 in front of the unity operator O_0=1 and the one and
two-loop contributions to the coefficient C_1 in front of the gluon
"condensate" operator O_1=-1/4 G^{\mu \nu} G_{\mu \nu}. For the correlator of
two operators O_1 we present the coefficient C_1 at two-loop level.
| [
{
"created": "Fri, 7 Sep 2012 12:41:30 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Oct 2012 14:23:28 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jul 2014 14:50:47 GMT",
"version": "v3"
}
] | 2015-06-11 | [
[
"Zoller",
"M. F.",
""
],
[
"Chetyrkin",
"K. G.",
""
]
] | We analytically calculate higher order corrections to coefficient functions of the operator product expansion (OPE) for the Euclidean correlator of two energy-momentum tensors in massless QCD. These are the three-loop contribution to the coefficient C_0 in front of the unity operator O_0=1 and the one and two-loop contributions to the coefficient C_1 in front of the gluon "condensate" operator O_1=-1/4 G^{\mu \nu} G_{\mu \nu}. For the correlator of two operators O_1 we present the coefficient C_1 at two-loop level. |
1606.08899 | Diogo Boito | Diogo Boito, Maarten Golterman, Kim Maltman, and Santiago Peris | $\alpha_s$ analyses from hadronic tau decays with OPAL and ALEPH data | Invited contribution to the workshop "Determination of the
Fundamental Parameters in QCD" (MITP/Mainz, 7-11 March 2016). 14 pages 5
figures | Mod. Phys. Lett. A, Vol. 31, No. 26 (2016) 1630024 | 10.1142/S021773231630024X | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, we extracted the strong coupling, $\alpha_s(m_\tau^2)$, from the
revised ALEPH data for non-strange hadronic tau decays. Our analysis is based
on a method previously used for the determination of the strong coupling from
OPAL data. In our strategy, we employ different moments of the spectral
functions both with and without pinching, including Duality Violations, in
order to obtain fully self-consistent analyses that do not rely on untested
assumptions (such as the smallness of higher dimension contributions in the
OPE). Here we discuss the $\alpha_s$ values obtained from the ALEPH and the
OPAL data, the robustness of the analysis, as well as non-perturbative
contributions from DVs and the OPE. We show that, although the $\alpha_s$
determination is sound, non-perturbative effects limit the accuracy with which
one can extract the strong coupling from tau decay data. Finally, we discuss
the compatibility of the data sets and the possibility of a combined analysis.
| [
{
"created": "Tue, 28 Jun 2016 21:47:48 GMT",
"version": "v1"
}
] | 2016-08-03 | [
[
"Boito",
"Diogo",
""
],
[
"Golterman",
"Maarten",
""
],
[
"Maltman",
"Kim",
""
],
[
"Peris",
"Santiago",
""
]
] | Recently, we extracted the strong coupling, $\alpha_s(m_\tau^2)$, from the revised ALEPH data for non-strange hadronic tau decays. Our analysis is based on a method previously used for the determination of the strong coupling from OPAL data. In our strategy, we employ different moments of the spectral functions both with and without pinching, including Duality Violations, in order to obtain fully self-consistent analyses that do not rely on untested assumptions (such as the smallness of higher dimension contributions in the OPE). Here we discuss the $\alpha_s$ values obtained from the ALEPH and the OPAL data, the robustness of the analysis, as well as non-perturbative contributions from DVs and the OPE. We show that, although the $\alpha_s$ determination is sound, non-perturbative effects limit the accuracy with which one can extract the strong coupling from tau decay data. Finally, we discuss the compatibility of the data sets and the possibility of a combined analysis. |
1911.06954 | G.R. Boroun | B.Rezaei and G.R.Boroun | Longitudinal structure function from the parton parameterization | 15 pages, 7 figures | Eur.Phys.J.A 56, 262(2020) | 10.1140/epja/s10050-020-00267-w | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a set of formulas to extract the longitudinal structure function
from the proton structure function and its derivatives with respect to lnQ2 in
the next-to-next-to-leading order of the perturbative theory at low x based on
a hard poemron exchange. The behavior of the DIS cross section ratio R(x;Q2)
and the ratio FL(x;Q2)=F2(x;Q2) studied and compared with the experimental
data, also these behaviors controlled by the color dipole model bound. These
results show a good agreement with the DIS experimental data throughout the low
values of x. These results within the next-to-next-to-leading order
approximation at very low x can be applied in the LHeC region for analyses of
ultra-high energy processes.
| [
{
"created": "Sat, 16 Nov 2019 04:47:46 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Mar 2020 13:26:17 GMT",
"version": "v2"
},
{
"created": "Sun, 21 Jun 2020 17:04:17 GMT",
"version": "v3"
}
] | 2020-10-20 | [
[
"Rezaei",
"B.",
""
],
[
"Boroun",
"G. R.",
""
]
] | We present a set of formulas to extract the longitudinal structure function from the proton structure function and its derivatives with respect to lnQ2 in the next-to-next-to-leading order of the perturbative theory at low x based on a hard poemron exchange. The behavior of the DIS cross section ratio R(x;Q2) and the ratio FL(x;Q2)=F2(x;Q2) studied and compared with the experimental data, also these behaviors controlled by the color dipole model bound. These results show a good agreement with the DIS experimental data throughout the low values of x. These results within the next-to-next-to-leading order approximation at very low x can be applied in the LHeC region for analyses of ultra-high energy processes. |
hep-ph/9706509 | null | Howard Baer and Michal Brhlik | Neutralino Dark Matter in Minimal Supergravity: Direct Detection vs.
Collider Searches | 25 page REVTEX file including 9 PS figures | Phys.Rev.D57:567-577,1998 | 10.1103/PhysRevD.57.567 | FSU-HEP-970605 | hep-ph | null | We calculate expected event rates for direct detection of relic neutralinos
as a function of parameter space of the minimal supergravity model. Numerical
results are presented for the specific case of a $^{73}$Ge detector. We find
significant detection rates ($R> 0.01$ events/kg/day) in regions of parameter
space most favored by constraints from $B\to X_s\gamma$ and the cosmological
relic density of neutralinos. The detection rates are especially large in
regions of large $\tan\beta$, where many conventional signals for supersymmetry
at collider experiments are difficult to detect. If the parameter $\tan\beta$
is large, then there is a significant probability that the first direct
evidence for supersymmetry could come from direct detection experiments, rather
than from collider searches for sparticles.
| [
{
"created": "Wed, 25 Jun 1997 16:29:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Baer",
"Howard",
""
],
[
"Brhlik",
"Michal",
""
]
] | We calculate expected event rates for direct detection of relic neutralinos as a function of parameter space of the minimal supergravity model. Numerical results are presented for the specific case of a $^{73}$Ge detector. We find significant detection rates ($R> 0.01$ events/kg/day) in regions of parameter space most favored by constraints from $B\to X_s\gamma$ and the cosmological relic density of neutralinos. The detection rates are especially large in regions of large $\tan\beta$, where many conventional signals for supersymmetry at collider experiments are difficult to detect. If the parameter $\tan\beta$ is large, then there is a significant probability that the first direct evidence for supersymmetry could come from direct detection experiments, rather than from collider searches for sparticles. |
hep-ph/0612068 | Sergey Ostapchenko | S. Ostapchenko | Hadronic Interactions at Cosmic Ray Energies | Prepared for the 14th International Symposium on Very High Energy
Cosmic Ray Interactions, August 15-22, 2006, Weihai, China | Nucl.Phys.Proc.Suppl.175-176:73-80,2008 | 10.1016/j.nuclphysbps.2007.10.011 | null | hep-ph | null | General physics of very high energy hadronic interactions is discussed.
Special attention is payed to the contribution of semihard processes to the
interaction dynamics and to the role of parton shadowing and parton density
saturation. In particular, the implementation of non-linear interaction effects
in the QGSJET-II model is discussed in detail. The predictions of the model are
compared to selected accelerator data, including ones of the RHIC collider, and
the relation to the calculated extensive air shower characteristics is
discussed. Finally, the potential of accelerator and cosmic ray experiments for
constraining model predictions is analyzed.
| [
{
"created": "Wed, 6 Dec 2006 13:25:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ostapchenko",
"S.",
""
]
] | General physics of very high energy hadronic interactions is discussed. Special attention is payed to the contribution of semihard processes to the interaction dynamics and to the role of parton shadowing and parton density saturation. In particular, the implementation of non-linear interaction effects in the QGSJET-II model is discussed in detail. The predictions of the model are compared to selected accelerator data, including ones of the RHIC collider, and the relation to the calculated extensive air shower characteristics is discussed. Finally, the potential of accelerator and cosmic ray experiments for constraining model predictions is analyzed. |
hep-ph/0404197 | Andreas Birkedal | Andreas Birkedal, Z. Chacko and Mary K. Gaillard | Little Supersymmetry and the Supersymmetric Little Hierarchy Problem | 25 pages; minor corrections, references added | JHEP 0410:036,2004 | 10.1088/1126-6708/2004/10/036 | UFIFT-HEP-04-5, CLNS04/1872, UCB-PTH-04/11, LBNL-54921 | hep-ph | null | The current experimental lower bound on the Higgs mass significantly
restricts the allowed parameter space in most realistic supersymmetric models,
with the consequence that these models exhibit significant fine-tuning. We
propose a solution to this `supersymmetric little hierarchy problem'. We
consider scenarios where the stop masses are relatively heavy - in the 500 GeV
to a TeV range. Radiative stability of the Higgs soft mass against quantum
corrections from the top quark Yukawa coupling is achieved by imposing a global
SU(3) symmetry on this interaction. This global symmetry is only approximate -
it is not respected by the gauge interactions. A subgroup of the global
symmetry is gauged by the familiar SU(2) of the Standard Model. The physical
Higgs is significantly lighter than the other scalars because it is the
pseudo-Goldstone boson associated with the breaking of this symmetry. Radiative
corrections to the Higgs potential naturally lead to the right pattern of gauge
and global symmetry breaking. We show that both the gauge and global symmetries
can be embedded into a single SU(6) grand unifying group, thereby maintaining
the prediction of gauge coupling unification. Among the firm predictions of
this class of models are new states with the quantum numbers of 10 and
$\bar{10}$ under SU(5) close to the TeV scale. The Higgs mass is expected to be
below 130 GeV, just as in the MSSM.
| [
{
"created": "Thu, 22 Apr 2004 18:26:34 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Apr 2004 18:28:33 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Birkedal",
"Andreas",
""
],
[
"Chacko",
"Z.",
""
],
[
"Gaillard",
"Mary K.",
""
]
] | The current experimental lower bound on the Higgs mass significantly restricts the allowed parameter space in most realistic supersymmetric models, with the consequence that these models exhibit significant fine-tuning. We propose a solution to this `supersymmetric little hierarchy problem'. We consider scenarios where the stop masses are relatively heavy - in the 500 GeV to a TeV range. Radiative stability of the Higgs soft mass against quantum corrections from the top quark Yukawa coupling is achieved by imposing a global SU(3) symmetry on this interaction. This global symmetry is only approximate - it is not respected by the gauge interactions. A subgroup of the global symmetry is gauged by the familiar SU(2) of the Standard Model. The physical Higgs is significantly lighter than the other scalars because it is the pseudo-Goldstone boson associated with the breaking of this symmetry. Radiative corrections to the Higgs potential naturally lead to the right pattern of gauge and global symmetry breaking. We show that both the gauge and global symmetries can be embedded into a single SU(6) grand unifying group, thereby maintaining the prediction of gauge coupling unification. Among the firm predictions of this class of models are new states with the quantum numbers of 10 and $\bar{10}$ under SU(5) close to the TeV scale. The Higgs mass is expected to be below 130 GeV, just as in the MSSM. |
hep-ph/9311362 | null | R. Arnowitt and Pran Nath | Supergravity Models | Talk at 31st International School of Sub Nuclear Physics, Erice,
1991, 23 pages, plaintex file, 6 figures avaliable upon request | null | null | CTP-TAMU-57/93-NUB-TH-3078/93 | hep-ph | null | Theoretical and experimental motivations behind supergravity grand unified
models are described. The basic ideas of supergravity, and the origin of the
soft breaking terms are reviewed. Effects of GUT thresholds and predictions
arising from models possessing proton decay are discussed. Speculations as to
which aspects of the Standard Model might be explained by supergravity models
and which may require Planck scale physics to understand are mentioned.
| [
{
"created": "Wed, 24 Nov 1993 22:35:05 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Arnowitt",
"R.",
""
],
[
"Nath",
"Pran",
""
]
] | Theoretical and experimental motivations behind supergravity grand unified models are described. The basic ideas of supergravity, and the origin of the soft breaking terms are reviewed. Effects of GUT thresholds and predictions arising from models possessing proton decay are discussed. Speculations as to which aspects of the Standard Model might be explained by supergravity models and which may require Planck scale physics to understand are mentioned. |
2301.03158 | Sudhansu Biswal S. | Sudhansu S. Biswal, Sushree S. Mishra and K. Sridhar | Resolution of the LHCb $\eta_c$ anomaly | 8 pages, 3 figures | null | 10.1007/JHEP05(2023)120 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Due to the heavy-quark symmetry of Non-Relativistic Quantum Chromodynamics
(NRQCD), the cross-section for the production of $\eta_c$ can be predicted.
This NRQCD prediction when confronted with data from the LHCb is seen to fail
miserably. We address this LHCb $\eta_c$ anomaly in this paper using a new
approach called modified NRQCD, an approach that has been shown to work
extremely well for studying $J/\psi$, $\psi^{\prime}$ and $\chi_c$ production
at the LHC. We show, in the present paper, that the predictions for $\eta_c$
production agrees very well with LHCb measurements at the three different
values of energy that the experiment has presented data for. Modified NRQCD
also explains the intriguing agreement of the LHCb $\eta_c$ data with the
colour-singlet prediction. The remarkable agreement of the theoretical
predictions with the LHCb data suggests that modified NRQCD is closer to
apprehending the true dynamics of quarkonium production.
| [
{
"created": "Mon, 9 Jan 2023 03:34:56 GMT",
"version": "v1"
}
] | 2023-05-31 | [
[
"Biswal",
"Sudhansu S.",
""
],
[
"Mishra",
"Sushree S.",
""
],
[
"Sridhar",
"K.",
""
]
] | Due to the heavy-quark symmetry of Non-Relativistic Quantum Chromodynamics (NRQCD), the cross-section for the production of $\eta_c$ can be predicted. This NRQCD prediction when confronted with data from the LHCb is seen to fail miserably. We address this LHCb $\eta_c$ anomaly in this paper using a new approach called modified NRQCD, an approach that has been shown to work extremely well for studying $J/\psi$, $\psi^{\prime}$ and $\chi_c$ production at the LHC. We show, in the present paper, that the predictions for $\eta_c$ production agrees very well with LHCb measurements at the three different values of energy that the experiment has presented data for. Modified NRQCD also explains the intriguing agreement of the LHCb $\eta_c$ data with the colour-singlet prediction. The remarkable agreement of the theoretical predictions with the LHCb data suggests that modified NRQCD is closer to apprehending the true dynamics of quarkonium production. |
1801.00164 | Chengrong Deng | Chengrong Deng, Jialun Ping, Hongxia Huang, and Fan Wang | Hidden charmed states and multibody color flux-tube dynamics | 10 pages, 5 tables | Phys. Rev. D 98, 014026 (2018) | 10.1103/PhysRevD.98.014026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of the color flux-tube model with a multibody
confinement potential, we systematically investigate the hidden charmed states
observed in recent years. It can be found that most of them can be described as
the compact tetraquark states $[cq][\bar{c}\bar{q}]$ ($q=u,d$ and $s$) in the
color flux-tube model. The multibody confinement potential based on the color
flux-tube picture is a dynamical mechanism in the formation and decay of the
compact tetraquark states.
| [
{
"created": "Sat, 30 Dec 2017 17:51:17 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2018 15:40:52 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Deng",
"Chengrong",
""
],
[
"Ping",
"Jialun",
""
],
[
"Huang",
"Hongxia",
""
],
[
"Wang",
"Fan",
""
]
] | Within the framework of the color flux-tube model with a multibody confinement potential, we systematically investigate the hidden charmed states observed in recent years. It can be found that most of them can be described as the compact tetraquark states $[cq][\bar{c}\bar{q}]$ ($q=u,d$ and $s$) in the color flux-tube model. The multibody confinement potential based on the color flux-tube picture is a dynamical mechanism in the formation and decay of the compact tetraquark states. |
1011.3203 | Larry McLerran | Larry McLerran | Strongly Interacting Matter Matter at Very High Energy Density: 3
Lectures in Zakopane | Presented at the 50'th Crakow School of Theoretical Physics,
Zakopane, Poland, June 2010 | Acta Phys.Polon.B41:2799-2826,2010 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These lectures concern the properties of strongly interacting matter at very
high energy density. I begin with the Color Glass Condensate and the Glasma,
matter that controls the earliest times in hadronic collisions. I then describe
the Quark Gluon Plasma, matter produced from the thermalized remnants of the
Glasma. Finally, I describe high density baryonic matter, in particular
Quarkyonic matter. The discussion will be intuitive and based on simple
structural aspects of QCD. There will be some discussion of experimental tests
of these ideas.
| [
{
"created": "Sun, 14 Nov 2010 09:55:22 GMT",
"version": "v1"
}
] | 2011-06-02 | [
[
"McLerran",
"Larry",
""
]
] | These lectures concern the properties of strongly interacting matter at very high energy density. I begin with the Color Glass Condensate and the Glasma, matter that controls the earliest times in hadronic collisions. I then describe the Quark Gluon Plasma, matter produced from the thermalized remnants of the Glasma. Finally, I describe high density baryonic matter, in particular Quarkyonic matter. The discussion will be intuitive and based on simple structural aspects of QCD. There will be some discussion of experimental tests of these ideas. |
hep-ph/0212379 | Fornengo Nicolao | A. Bottino, N. Fornengo, S. Scopel (U. of Torino and INFN - Torino) | Light Relic Neutralinos | 11 pages, 4 figures, typeset with ReVTeX4. The paper may also be
found at http://www.to.infn.it/~fornengo/papers/light.ps.gz Some comments and
references added | Phys.Rev.D67:063519,2003 | 10.1103/PhysRevD.67.063519 | DFTT 42/2002 | hep-ph astro-ph hep-ex | null | The relic abundance and the scalar cross-section off nucleon for light
neutralinos (of mass below about 45 GeV) are evaluated in an effective MSSM
model without GUT-inspired relations among gaugino masses. It is shown that
these neutralinos may provide a sizeable contribution to the matter density in
the Universe and produce measurable effects in WIMP direct detection
experiments. These properties are elucidated in terms of simple analytical
arguments.
| [
{
"created": "Fri, 27 Dec 2002 16:54:23 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2003 17:19:53 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bottino",
"A.",
"",
"U. of Torino and INFN - Torino"
],
[
"Fornengo",
"N.",
"",
"U. of Torino and INFN - Torino"
],
[
"Scopel",
"S.",
"",
"U. of Torino and INFN - Torino"
]
] | The relic abundance and the scalar cross-section off nucleon for light neutralinos (of mass below about 45 GeV) are evaluated in an effective MSSM model without GUT-inspired relations among gaugino masses. It is shown that these neutralinos may provide a sizeable contribution to the matter density in the Universe and produce measurable effects in WIMP direct detection experiments. These properties are elucidated in terms of simple analytical arguments. |
0808.1944 | Alexander Lenz | Alexander J. Lenz | Search for new physics in $B_s$-mixing | Invited talk at Continuous Advances in QCD (CAQCD-08), May 15-18,
2008, Minneapolis; 9 pages; 2 References added | null | 10.1142/9789812838667_0006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the current status of the search for new physics effects in the
mixing quantities $\Delta M_s$, $\Delta \Gamma_s$ and $\phi_s$ of the neutral
$B_s$-system.
| [
{
"created": "Thu, 14 Aug 2008 05:48:07 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Nov 2008 12:58:23 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Lenz",
"Alexander J.",
""
]
] | We present the current status of the search for new physics effects in the mixing quantities $\Delta M_s$, $\Delta \Gamma_s$ and $\phi_s$ of the neutral $B_s$-system. |
hep-ph/0610042 | Ivanov Dmitry | D.Yu. Ivanov and A. Papa | Electroproduction of two light vector mesons in next-to-leading BFKL:
study of systematic effects | 17 pages, 11 figures; journal version, new figures and discussion
added | Eur.Phys.J.C49:947-955,2007 | 10.1140/epjc/s10052-006-0180-8 | null | hep-ph | null | The forward electroproduction of two light vector mesons is the first example
of a collision process between strongly interacting colorless particles for
which the amplitude can be written completely within perturbative QCD in the
Regge limit with next-to-leading accuracy. In a previous paper we have given a
numerical determination of the amplitude in the case of equal photon
virtualities by using a definite representation for the amplitude and a
definite optimization method for the perturbative series. Here we estimate the
systematic uncertainty of our previous determination, by considering a
different representation of the amplitude and different optimization methods of
the perturbative series. Moreover, we compare our result for the differential
cross section at the minimum momentum transfer with a different approach, based
on collinear kernel improvement.
| [
{
"created": "Wed, 4 Oct 2006 08:40:59 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2006 13:46:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ivanov",
"D. Yu.",
""
],
[
"Papa",
"A.",
""
]
] | The forward electroproduction of two light vector mesons is the first example of a collision process between strongly interacting colorless particles for which the amplitude can be written completely within perturbative QCD in the Regge limit with next-to-leading accuracy. In a previous paper we have given a numerical determination of the amplitude in the case of equal photon virtualities by using a definite representation for the amplitude and a definite optimization method for the perturbative series. Here we estimate the systematic uncertainty of our previous determination, by considering a different representation of the amplitude and different optimization methods of the perturbative series. Moreover, we compare our result for the differential cross section at the minimum momentum transfer with a different approach, based on collinear kernel improvement. |
1003.4504 | Micha{\l} Silarski | M. Silarski, P. Moskal (for the COSY-11 collaboration) | Study of the near threshold pp-->ppK+K- reaction in view of the K+K
final state interaction | Invited talk at the Excited QCD 2010 Workshop, 31 January-6 February
2010, Stara Lesna, Slovakia, 6 pages | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Measurements of the pp-->ppK+K- reaction, performed near the kinematical
threshold with the experiment COSY-11 at the Cooler Synchrotron COSY, reveal a
significant discrepancy between obtained excitation function and theoretical
expectations neglecting interactions of kaons. In order to deepen our knowledge
about the low energy dynamics of the ppKK system we investigated population of
events for the pp-->ppK+K- reaction as a function of the invariant masses of
two particle subsystems. Based for the first time on the low-energy K+K-
invariant mass distributions and the generalized Dalitz plot analysis, we
estimated the scattering length for the K+K- interaction.
| [
{
"created": "Tue, 23 Mar 2010 19:53:07 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Mar 2010 10:48:01 GMT",
"version": "v2"
}
] | 2019-08-14 | [
[
"Silarski",
"M.",
"",
"for the COSY-11 collaboration"
],
[
"Moskal",
"P.",
"",
"for the COSY-11 collaboration"
]
] | Measurements of the pp-->ppK+K- reaction, performed near the kinematical threshold with the experiment COSY-11 at the Cooler Synchrotron COSY, reveal a significant discrepancy between obtained excitation function and theoretical expectations neglecting interactions of kaons. In order to deepen our knowledge about the low energy dynamics of the ppKK system we investigated population of events for the pp-->ppK+K- reaction as a function of the invariant masses of two particle subsystems. Based for the first time on the low-energy K+K- invariant mass distributions and the generalized Dalitz plot analysis, we estimated the scattering length for the K+K- interaction. |
hep-ph/0112131 | Timo Arvid Lahde | T.A. Lahde and D.O. Riska | Pion Rescattering in Two-Pion Decay of Heavy Quarkonia | 27 pages, 13 figures, uses Feynmf. Submitted to Nuclear Physics A v2:
Minor corrections to formatting v3: Corrected Feynman diagram labels. v4: 25
pages, 10 figures, Accepted version | Nucl.Phys. A707 (2002) 425-451 | 10.1016/S0375-9474(02)00964-8 | null | hep-ph | null | The role of pion rescattering in $\pi\pi$ decay of radially excited heavy
quarkonia modeled in terms of a $Q\pi\pi$ coupling, is investigated within the
framework of the covariant Blankenbecler-Sugar equation. The effects of pion
rescattering (or pion exchange) are shown to be large, unless the coupling of
the two-pion system to the heavy quarks is mediated by a fairly light scalar
$\sigma$ meson, which couples to the gradients of the pion fields. The
Hamiltonian model for the quarkonium states is formed of linear scalar
confining, screened one-gluon exchange and instanton induced interaction terms.
The widths and energy distributions of the basic decays $\psi'\to J/\psi
\pi\pi$ and $\Upsilon'\to \Upsilon \pi\pi$ are shown to be satisfactorily
described by this model. The implications of this model for the decays of the
$\Upsilon(3S)$ state are discussed.
| [
{
"created": "Mon, 10 Dec 2001 10:14:21 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Dec 2001 19:09:23 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Dec 2001 12:27:58 GMT",
"version": "v3"
},
{
"created": "Wed, 24 Apr 2002 12:10:19 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Lahde",
"T. A.",
""
],
[
"Riska",
"D. O.",
""
]
] | The role of pion rescattering in $\pi\pi$ decay of radially excited heavy quarkonia modeled in terms of a $Q\pi\pi$ coupling, is investigated within the framework of the covariant Blankenbecler-Sugar equation. The effects of pion rescattering (or pion exchange) are shown to be large, unless the coupling of the two-pion system to the heavy quarks is mediated by a fairly light scalar $\sigma$ meson, which couples to the gradients of the pion fields. The Hamiltonian model for the quarkonium states is formed of linear scalar confining, screened one-gluon exchange and instanton induced interaction terms. The widths and energy distributions of the basic decays $\psi'\to J/\psi \pi\pi$ and $\Upsilon'\to \Upsilon \pi\pi$ are shown to be satisfactorily described by this model. The implications of this model for the decays of the $\Upsilon(3S)$ state are discussed. |
1009.4729 | Ian Balitsky | Ian Balitsky and Giovanni A. Chirilli | Photon impact factor in the next-to-leading order | 5 pages, 3 figures | Phys.Rev.D83:031502,2011 | 10.1103/PhysRevD.83.031502 | JLAB-THY-10-1231, LPT-ORSAY 10-74, CPHT-RR081.0910 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analytic coordinate-space expression for the next-to-leading order photon
impact factor for small-$x$ deep inelastic scattering is calculated using the
operator expansion in Wilson lines.
| [
{
"created": "Thu, 23 Sep 2010 21:27:54 GMT",
"version": "v1"
}
] | 2011-02-18 | [
[
"Balitsky",
"Ian",
""
],
[
"Chirilli",
"Giovanni A.",
""
]
] | An analytic coordinate-space expression for the next-to-leading order photon impact factor for small-$x$ deep inelastic scattering is calculated using the operator expansion in Wilson lines. |
hep-ph/0007149 | Alexander V. Kuznetsov | A.V. Kuznetsov, N.V. Mikheev (Yaroslavl State (Demidov) University,
Russia) | Compton-like interaction of massive neutrinos with virtual photons | 6 pages, LATEX, 2 PS figures | Phys.Lett. B299 (1993) 367-369 | 10.1016/0370-2693(93)90275-M | null | hep-ph | null | The amplitude of a Compton-like process nu_i gamma^* -> nu_j gamma^* with
virtual photons is calculated in the standard GWS theory with lepton mixing.
The contribution of this process to the high energy neutrino scattering on the
nucleus with single photon radiation nu N -> nu N gamma is discussed. The
bremsspectrum and the total cross-section are estimated in the leading log
approximation.
| [
{
"created": "Fri, 14 Jul 2000 07:20:28 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kuznetsov",
"A. V.",
"",
"Yaroslavl State"
],
[
"Mikheev",
"N. V.",
"",
"Yaroslavl State"
]
] | The amplitude of a Compton-like process nu_i gamma^* -> nu_j gamma^* with virtual photons is calculated in the standard GWS theory with lepton mixing. The contribution of this process to the high energy neutrino scattering on the nucleus with single photon radiation nu N -> nu N gamma is discussed. The bremsspectrum and the total cross-section are estimated in the leading log approximation. |
0808.3079 | Maike Kristina Trenkel | H.K. Dreiner, S. Grab, and M.K. Trenkel | Stau LSP Phenomenology: Two- versus Four-Body Decay Modes and Resonant
Single Slepton Production at the LHC as an Example | 25 pages, 13 figures; typos corrected, title changed, references
added: final version accepted by PRD | Phys.Rev.D79:016002,2009; Erratum-ibid.79:019902,2009 | 10.1103/PhysRevD.79.016002 10.1103/PhysRevD.79.019902 | BONN-TH-2008-08, MPP-2008-92 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate B3 mSUGRA models, where the lightest scalar tau, stau_1, is
the LSP. B3 models allow for lepton number and R-parity violation; the LSP can
thus decay. We assume one non-zero B3 coupling lambda'_ijk at M_GUT, which
generates further B3 couplings at M_Z. We study the RGEs and give numerical
examples. The new couplings lead to additional stau_1 decays, providing
distinct collider signatures. We classify the stau_1 decays and describe their
dependence on the mSUGRA parameters. We exploit our results for single slepton
production at the LHC. As an explicit numerical example, we investigate single
smuon production, focussing on like-sign dimuons in the final state. Also
considered are final states with three or four muons.
| [
{
"created": "Fri, 22 Aug 2008 13:58:16 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 2009 08:26:36 GMT",
"version": "v2"
}
] | 2009-04-23 | [
[
"Dreiner",
"H. K.",
""
],
[
"Grab",
"S.",
""
],
[
"Trenkel",
"M. K.",
""
]
] | We investigate B3 mSUGRA models, where the lightest scalar tau, stau_1, is the LSP. B3 models allow for lepton number and R-parity violation; the LSP can thus decay. We assume one non-zero B3 coupling lambda'_ijk at M_GUT, which generates further B3 couplings at M_Z. We study the RGEs and give numerical examples. The new couplings lead to additional stau_1 decays, providing distinct collider signatures. We classify the stau_1 decays and describe their dependence on the mSUGRA parameters. We exploit our results for single slepton production at the LHC. As an explicit numerical example, we investigate single smuon production, focussing on like-sign dimuons in the final state. Also considered are final states with three or four muons. |
1509.07525 | Jordan Smolinsky | Jonathan L. Feng, Jordan Smolinsky, Philip Tanedo | Dark Photons from the Center of the Earth: Smoking-Gun Signals of Dark
Matter | 26 pages, 10 figures. v2: minor revisions to match published version;
v3: updated direct detection and CMB constraints and corrected decay length
in code, moving the region of experimental sensitivity to values of epsilon
that are lower by an order of magnitude | Phys. Rev. D 93, 015014 (2016) | 10.1103/PhysRevD.93.015014 | UCI-TR-2015-07 | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter may be charged under dark electromagnetism with a dark photon
that kinetically mixes with the Standard Model photon. In this framework, dark
matter will collect at the center of the Earth and annihilate into dark
photons, which may reach the surface of the Earth and decay into observable
particles. We determine the resulting signal rates, including Sommerfeld
enhancements, which play an important role in bringing the Earth's dark matter
population to their maximal, equilibrium value. For dark matter masses $m_X
\sim$ 100 GeV - 10 TeV, dark photon masses $m_{A'} \sim$ MeV - GeV, and kinetic
mixing parameters $\varepsilon \sim 10^{-10} - 10^{-8}$, the resulting
electrons, muons, photons, and hadrons that point back to the center of the
Earth are a smoking-gun signal of dark matter that may be detected by a variety
of experiments, including neutrino telescopes, such as IceCube, and space-based
cosmic ray detectors, such as Fermi-LAT and AMS. We determine the signal rates
and characteristics, and show that large and striking signals---such as
parallel muon tracks---are possible in regions of the $(m_{A'}, \varepsilon)$
plane that are not probed by direct detection, accelerator experiments, or
astrophysical observations.
| [
{
"created": "Thu, 24 Sep 2015 20:21:16 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2016 00:15:45 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Oct 2017 21:35:25 GMT",
"version": "v3"
}
] | 2017-10-05 | [
[
"Feng",
"Jonathan L.",
""
],
[
"Smolinsky",
"Jordan",
""
],
[
"Tanedo",
"Philip",
""
]
] | Dark matter may be charged under dark electromagnetism with a dark photon that kinetically mixes with the Standard Model photon. In this framework, dark matter will collect at the center of the Earth and annihilate into dark photons, which may reach the surface of the Earth and decay into observable particles. We determine the resulting signal rates, including Sommerfeld enhancements, which play an important role in bringing the Earth's dark matter population to their maximal, equilibrium value. For dark matter masses $m_X \sim$ 100 GeV - 10 TeV, dark photon masses $m_{A'} \sim$ MeV - GeV, and kinetic mixing parameters $\varepsilon \sim 10^{-10} - 10^{-8}$, the resulting electrons, muons, photons, and hadrons that point back to the center of the Earth are a smoking-gun signal of dark matter that may be detected by a variety of experiments, including neutrino telescopes, such as IceCube, and space-based cosmic ray detectors, such as Fermi-LAT and AMS. We determine the signal rates and characteristics, and show that large and striking signals---such as parallel muon tracks---are possible in regions of the $(m_{A'}, \varepsilon)$ plane that are not probed by direct detection, accelerator experiments, or astrophysical observations. |
hep-ph/9806293 | Joakim Edsjo | L. Bergstrom (Stockholm University), J. Edsjo (UC Berkeley) and P.
Gondolo (MPI, Munich) | Indirect Detection of Dark Matter in km-size Neutrino Telescopes | 16 pages, 16 figures, uses RevTeX | Phys. Rev. D 58, 103519 (1998) | 10.1103/PhysRevD.58.103519 | MPI-PhT/98-44, CfPA-98-Th-12 | hep-ph astro-ph | null | Neutrino telescopes of kilometer size are currently being planned. They will
be two or three orders of magnitude bigger than presently operating detectors,
but they will have a much higher muon energy threshold. We discuss the
trade-off between area and energy threshold for indirect detection of
neutralino dark matter captured in the Sun and in the Earth and annihilating
into high energy neutrinos. We also study the effect of a higher threshold on
the complementarity of different searches for supersymmetric dark matter.
| [
{
"created": "Sat, 6 Jun 1998 03:16:09 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Bergstrom",
"L.",
"",
"Stockholm University"
],
[
"Edsjo",
"J.",
"",
"UC Berkeley"
],
[
"Gondolo",
"P.",
"",
"MPI, Munich"
]
] | Neutrino telescopes of kilometer size are currently being planned. They will be two or three orders of magnitude bigger than presently operating detectors, but they will have a much higher muon energy threshold. We discuss the trade-off between area and energy threshold for indirect detection of neutralino dark matter captured in the Sun and in the Earth and annihilating into high energy neutrinos. We also study the effect of a higher threshold on the complementarity of different searches for supersymmetric dark matter. |
1607.01899 | Yuki Kamiya | Yuki Kamiya and Tetsuo Hyodo | Generalized weak-binding relations of compositeness in effective field
theory | 46 pages, 12 figures, published version | Prog. Theor. Exp. Phys. 2017, 023D02 | 10.1093/ptep/ptw188 | YITP-16-85 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the compositeness of near-threshold states to investigate the
internal structure of exotic hadron candidates. Within the framework of
effective field theory, Weinberg's weak-binding relation is extended to more
general cases by easing several preconditions. First, by evaluating the
contribution from the decay channel, we obtain the generalized relation for
unstable quasibound states. Next, we generalize the relation to include the
nearby CDD (Castillejo-Dalitz-Dyson) pole contribution with the help of the
Pade approximant. The validity of the estimation with the generalized
weak-binding relations is examined by numerical calculations. The method to
systematically evaluate the error in the weak-binding relation is presented.
Finally, by applying the extended relation to Lambda(1405), f0(980) and
a0(980), we discuss their internal structure, in comparison with other
approaches.
| [
{
"created": "Thu, 7 Jul 2016 07:44:35 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2016 09:58:08 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Mar 2017 09:48:26 GMT",
"version": "v3"
}
] | 2017-03-24 | [
[
"Kamiya",
"Yuki",
""
],
[
"Hyodo",
"Tetsuo",
""
]
] | We study the compositeness of near-threshold states to investigate the internal structure of exotic hadron candidates. Within the framework of effective field theory, Weinberg's weak-binding relation is extended to more general cases by easing several preconditions. First, by evaluating the contribution from the decay channel, we obtain the generalized relation for unstable quasibound states. Next, we generalize the relation to include the nearby CDD (Castillejo-Dalitz-Dyson) pole contribution with the help of the Pade approximant. The validity of the estimation with the generalized weak-binding relations is examined by numerical calculations. The method to systematically evaluate the error in the weak-binding relation is presented. Finally, by applying the extended relation to Lambda(1405), f0(980) and a0(980), we discuss their internal structure, in comparison with other approaches. |
1706.08548 | Kaori Fuyuto | Kaori Fuyuto and Michael Ramsey-Musolf | Top Down Electroweak Dipole Operators | 7 pages, 6 figures | null | 10.1016/j.physletb.2018.04.022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive present constraints on, and prospective sensitivity to, the
electric dipole moment (EDM) of the top quark ($d_t$) implied by searches for
the EDMs of the electron and nucleons. Above the electroweak scale $v$, the
$d_t$ arises from two gauge invariant operators generated at a scale $\Lambda
\gg v$ that also mix with the light fermion EDMs under renormalization group
evolution at two-loop order. Bounds on the EDMs of first generation fermion
systems thus imply bounds on $|d_t|$. Working in the leading log-squared
approximation, we find that the present upper bound on $|d_t|$ is roughly
$10^{-19}$ $e$ cm for $\Lambda = 1$ TeV, except in regions of finely tuned
cancellations that allow for $|d_t|$ to be up to fifty times larger. Future
$d_e$ and $d_n$ probes may yield an order of magnitude increase in $d_t$
sensitivity, while inclusion of a prospective proton EDM search may lead to an
additional increase in reach.
| [
{
"created": "Mon, 26 Jun 2017 18:06:39 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Fuyuto",
"Kaori",
""
],
[
"Ramsey-Musolf",
"Michael",
""
]
] | We derive present constraints on, and prospective sensitivity to, the electric dipole moment (EDM) of the top quark ($d_t$) implied by searches for the EDMs of the electron and nucleons. Above the electroweak scale $v$, the $d_t$ arises from two gauge invariant operators generated at a scale $\Lambda \gg v$ that also mix with the light fermion EDMs under renormalization group evolution at two-loop order. Bounds on the EDMs of first generation fermion systems thus imply bounds on $|d_t|$. Working in the leading log-squared approximation, we find that the present upper bound on $|d_t|$ is roughly $10^{-19}$ $e$ cm for $\Lambda = 1$ TeV, except in regions of finely tuned cancellations that allow for $|d_t|$ to be up to fifty times larger. Future $d_e$ and $d_n$ probes may yield an order of magnitude increase in $d_t$ sensitivity, while inclusion of a prospective proton EDM search may lead to an additional increase in reach. |
2106.14964 | Prudhvi Nikhil Bhattiprolu | Prudhvi N. Bhattiprolu, Stephen P. Martin | High-quality axions in solutions to the $\mu$ problem | 50 pages. v2: references added. v3: accepted by PRD, minor changes in
Section V, references added | Phys. Rev. D 104, 055014 (2021) | 10.1103/PhysRevD.104.055014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solutions to the $\mu$ problem in supersymmetry based on the Kim-Nilles
mechanism naturally feature a Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) axion
with decay constant of order the geometric mean of the Planck and TeV scales,
consistent with astrophysical limits. We investigate minimal models of this
type with two gauge-singlet fields that break a Peccei-Quinn symmetry, and
extensions with extra vectorlike quark and lepton supermultiplets consistent
with gauge coupling unification. We show that there are many anomaly-free
discrete symmetries, depending on the vectorlike matter content, that protect
the Peccei-Quinn symmetry to sufficiently high order to solve the strong CP
problem. We study the axion couplings in this class of models. Models of this
type that are automatically free of the domain wall problem require at least
one pair of strongly interacting vectorlike multiplets with mass at the
intermediate scale, and predict axion couplings that are greatly enhanced
compared to the minimal supersymmetric DFSZ models, putting them within reach
of proposed axion searches.
| [
{
"created": "Mon, 28 Jun 2021 20:03:42 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jul 2021 15:48:20 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Aug 2021 02:55:32 GMT",
"version": "v3"
}
] | 2021-09-22 | [
[
"Bhattiprolu",
"Prudhvi N.",
""
],
[
"Martin",
"Stephen P.",
""
]
] | Solutions to the $\mu$ problem in supersymmetry based on the Kim-Nilles mechanism naturally feature a Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) axion with decay constant of order the geometric mean of the Planck and TeV scales, consistent with astrophysical limits. We investigate minimal models of this type with two gauge-singlet fields that break a Peccei-Quinn symmetry, and extensions with extra vectorlike quark and lepton supermultiplets consistent with gauge coupling unification. We show that there are many anomaly-free discrete symmetries, depending on the vectorlike matter content, that protect the Peccei-Quinn symmetry to sufficiently high order to solve the strong CP problem. We study the axion couplings in this class of models. Models of this type that are automatically free of the domain wall problem require at least one pair of strongly interacting vectorlike multiplets with mass at the intermediate scale, and predict axion couplings that are greatly enhanced compared to the minimal supersymmetric DFSZ models, putting them within reach of proposed axion searches. |
hep-ph/9607316 | Cheuk-Yin Wong | Cheuk-Yin Wong (ORNL) and Lali Chatterjee (ORNL, UT, and Jadavpur) | Effects of Final-State Interaction and Screening on Strange- and
Heavy-Quark Production | 12 pages (Latex), 6 figures. Invited talk presented at Strangeness'96
Meeting, Budapest, May 1996. To be published in "Heavy-Ion Physics" | null | 10.1007/BF03155615 | ORNL-CTP-96-08 | hep-ph nucl-th | null | Final-state interaction and screening have a great influence on $q \bar q$
production cross sections, which are important quantities in many problems in
quark-gluon plasma physics. They lead to an enhancement of the cross section
for a $q \bar q$ color-singlet state and a suppression for a color-octet state.
The effects are large near the production threshold. The presence of screening
gives rise to resonances for $q\bar q$ production just above the threshold at
specific plasma temperatures. These resonances, especially $c\bar c$ and $b
\bar b$ resonances, may be utilized to search for the quark-gluon plasma by
studying the temperature dependence of heavy-quark pair production just above
the threshold.
| [
{
"created": "Mon, 15 Jul 1996 14:22:31 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Wong",
"Cheuk-Yin",
"",
"ORNL"
],
[
"Chatterjee",
"Lali",
"",
"ORNL, UT, and Jadavpur"
]
] | Final-state interaction and screening have a great influence on $q \bar q$ production cross sections, which are important quantities in many problems in quark-gluon plasma physics. They lead to an enhancement of the cross section for a $q \bar q$ color-singlet state and a suppression for a color-octet state. The effects are large near the production threshold. The presence of screening gives rise to resonances for $q\bar q$ production just above the threshold at specific plasma temperatures. These resonances, especially $c\bar c$ and $b \bar b$ resonances, may be utilized to search for the quark-gluon plasma by studying the temperature dependence of heavy-quark pair production just above the threshold. |
2101.07811 | Andreas Crivellin | Andreas Crivellin, Dario M\"uller and Luc Schnell | Combined Constraints on First Generation Leptoquarks | 12 pages, 3 figures, 2 tables, missing factor 2 in non-resonant ATLAS
bounds corrected | Phys. Rev. D 103, 115023 (2021) | 10.1103/PhysRevD.103.115023 | CERN-TH-2021-012, PSI-PR-21-01, ZU-TH 01/21 | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | In this article we perform a combined analysis of low energy precision
constraints and LHC searches for leptoquarks which couple to first generation
fermions. Considering all ten leptoquark representations, five scalar and five
vector ones, we study at the precision frontier the constraints from
$K\to\pi\nu\nu$, $K\to\pi e^+e^-$, $K^0-\bar K^0$ and $D^0-\bar D^0$ mixing, as
well as from experiments searching for parity violation (APV and QWEAK). We
include LHC searches for $s$-channel single resonant production, pair
production and Drell-Yan-like signatures of leptoquarks. Interestingly, we find
that the recent non-resonant di-lepton analysis of ATLAS provides stronger
bounds than the resonant searches recasted so far to constrain $t$-channel
production of leptoquarks. Taking into account all these bounds, we observe
that none of the leptoquark representations can address the so-called "Cabibbo
angle anomaly" via a direct contribution to super-allowed beta decays.
| [
{
"created": "Tue, 19 Jan 2021 19:00:28 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 2021 14:34:46 GMT",
"version": "v2"
}
] | 2021-06-23 | [
[
"Crivellin",
"Andreas",
""
],
[
"Müller",
"Dario",
""
],
[
"Schnell",
"Luc",
""
]
] | In this article we perform a combined analysis of low energy precision constraints and LHC searches for leptoquarks which couple to first generation fermions. Considering all ten leptoquark representations, five scalar and five vector ones, we study at the precision frontier the constraints from $K\to\pi\nu\nu$, $K\to\pi e^+e^-$, $K^0-\bar K^0$ and $D^0-\bar D^0$ mixing, as well as from experiments searching for parity violation (APV and QWEAK). We include LHC searches for $s$-channel single resonant production, pair production and Drell-Yan-like signatures of leptoquarks. Interestingly, we find that the recent non-resonant di-lepton analysis of ATLAS provides stronger bounds than the resonant searches recasted so far to constrain $t$-channel production of leptoquarks. Taking into account all these bounds, we observe that none of the leptoquark representations can address the so-called "Cabibbo angle anomaly" via a direct contribution to super-allowed beta decays. |
1507.01914 | Jose Santiago | Adrian Carmona, Antonio Delgado, Mariano Quiros, Jose Santiago | Diboson resonant production in non-custodial composite Higgs models | 15 pages, 2 figures | null | null | CERN-PH-TH-2015-154 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the recently reported excess in resonant diboson production can
be explained in the context of non-custodial composite Higgs models. Dibosons
are generated via the s-channel exchange of massive vector bosons present in
these models. We discuss the compatibility of the signal excess with other
diboson experimental searches. We also discuss the tension between diboson
production and other experimental tests of the model that include electroweak
precision data, dilepton, dijet and top pair production and show that there is
a region of parameter space in which they are all compatible with the excess.
| [
{
"created": "Tue, 7 Jul 2015 18:37:52 GMT",
"version": "v1"
}
] | 2015-07-08 | [
[
"Carmona",
"Adrian",
""
],
[
"Delgado",
"Antonio",
""
],
[
"Quiros",
"Mariano",
""
],
[
"Santiago",
"Jose",
""
]
] | We show that the recently reported excess in resonant diboson production can be explained in the context of non-custodial composite Higgs models. Dibosons are generated via the s-channel exchange of massive vector bosons present in these models. We discuss the compatibility of the signal excess with other diboson experimental searches. We also discuss the tension between diboson production and other experimental tests of the model that include electroweak precision data, dilepton, dijet and top pair production and show that there is a region of parameter space in which they are all compatible with the excess. |
hep-ph/9403331 | Jim Ohnemus | J. Ohnemus | Hadronic $ZZ$, $W^- W^+$, and $W^{\pm} Z$ Production with QCD
Corrections and Leptonic Decays | 26 pages, Revtex 3.0, preprint UCD-94-9, 16 postscript figures
available via anonymous ftp | Phys.Rev.D50:1931-1945,1994 | 10.1103/PhysRevD.50.1931 | null | hep-ph | null | The processes $p p \rightarrow V_1 V_2 + X \rightarrow \ell_1 \bar \ell_1
\ell_2 \bar \ell_2 + X$, where $V_i = W^{\pm}$ or $Z$ and $\ell_i$ denotes a
lepton, are calculated to ${\cal O}(\alpha_s)$. Total and differential cross
sections, with acceptance cuts imposed on the final state leptons, are given
for the Tevatron and LHC center of mass energies. Inclusive and exclusive
$0$-jet and $1$-jet cross sections are given. The transverse momenta spectra of
the leptons are significantly enhanced at high $p_T^{}$ by the QCD radiative
corrections, especially at the LHC energy. Invariant mass and angular
distributions are scaled up in magnitude by the QCD radiative corrections, but
are little changed in shape.
| [
{
"created": "Tue, 22 Mar 1994 03:10:18 GMT",
"version": "v1"
}
] | 2011-05-05 | [
[
"Ohnemus",
"J.",
""
]
] | The processes $p p \rightarrow V_1 V_2 + X \rightarrow \ell_1 \bar \ell_1 \ell_2 \bar \ell_2 + X$, where $V_i = W^{\pm}$ or $Z$ and $\ell_i$ denotes a lepton, are calculated to ${\cal O}(\alpha_s)$. Total and differential cross sections, with acceptance cuts imposed on the final state leptons, are given for the Tevatron and LHC center of mass energies. Inclusive and exclusive $0$-jet and $1$-jet cross sections are given. The transverse momenta spectra of the leptons are significantly enhanced at high $p_T^{}$ by the QCD radiative corrections, especially at the LHC energy. Invariant mass and angular distributions are scaled up in magnitude by the QCD radiative corrections, but are little changed in shape. |
hep-ph/0406250 | Krzysztof Redlich | Krzysztof Redlich (Wroclaw U., Bielefeld U.) | From chemical freezeout to critical conditions in heavy ion collisions | Talk given at BUDAPEST'2004 Workshop on 'Hot and Dense Matter in
Relativistic Heavy Ion Physics', Budapest, March 24-27, 2004 | Acta Phys.Hung. A22 (2005) 343-353 | 10.1556/APH.22.2005.3-4.21 | null | hep-ph | null | We compare the statistical thermodynamics of hadron resonance gas with recent
LGT results at finite chemical potential. We argue that for $T\leq T_c$ the
equation of state derived from
Monte--Carlo simulations of two quark--flavor QCD at finite chemical
potential is consistent with that of a hadron resonance gas when applying the
same set of approximations as used in LGT calculations.
We indicate the relation of chemical freezeout conditions obtained from a
detailed analysis of particle production in heavy ion collisions with the
critical conditions required for deconfinement. We argue that the position of a
hadron--quark gluon boundary line in temperature chemical potential plane can
be determined in terms of the resonance gas model by the condition of fixed
energy density.
| [
{
"created": "Wed, 23 Jun 2004 09:36:35 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 2004 09:26:43 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Redlich",
"Krzysztof",
"",
"Wroclaw U., Bielefeld U."
]
] | We compare the statistical thermodynamics of hadron resonance gas with recent LGT results at finite chemical potential. We argue that for $T\leq T_c$ the equation of state derived from Monte--Carlo simulations of two quark--flavor QCD at finite chemical potential is consistent with that of a hadron resonance gas when applying the same set of approximations as used in LGT calculations. We indicate the relation of chemical freezeout conditions obtained from a detailed analysis of particle production in heavy ion collisions with the critical conditions required for deconfinement. We argue that the position of a hadron--quark gluon boundary line in temperature chemical potential plane can be determined in terms of the resonance gas model by the condition of fixed energy density. |
1311.1550 | HoSeong La | HoSeong La and Thomas J. Weiler | Simple Mass Matrix Ans\"atze for Neutrino Mixing | 5 pages (two-column), one table, revtex4-1, further clarifications
emphasizing the emergent nature of the symmetry | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate the PMNS (Pontecorvo-Maki-Nakagawa-Sakata) matrix in terms of
neutrino and charged lepton mixing given as $U_{\rm PMNS}=V_{\rm
lep}^\dagger(\tilde\theta_{13}) U_\nu(\tilde\theta_{23}, \tilde\theta_{12})$,
based on a new (emergent) global lepton flavor symmetry. The neutrino and
charged lepton mass matrices have simple textures. The resulting $U_{\rm PMNS}$
gives excellent agreement with experimental data (including $|U_{e3}|\simeq
0.16$).
| [
{
"created": "Wed, 6 Nov 2013 23:59:54 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 2014 20:03:37 GMT",
"version": "v2"
}
] | 2014-04-17 | [
[
"La",
"HoSeong",
""
],
[
"Weiler",
"Thomas J.",
""
]
] | We estimate the PMNS (Pontecorvo-Maki-Nakagawa-Sakata) matrix in terms of neutrino and charged lepton mixing given as $U_{\rm PMNS}=V_{\rm lep}^\dagger(\tilde\theta_{13}) U_\nu(\tilde\theta_{23}, \tilde\theta_{12})$, based on a new (emergent) global lepton flavor symmetry. The neutrino and charged lepton mass matrices have simple textures. The resulting $U_{\rm PMNS}$ gives excellent agreement with experimental data (including $|U_{e3}|\simeq 0.16$). |
1307.5993 | Alexander Berezhnoy | A. V. Berezhnoy and A. K. Likhoded | The observation possibility of $B_c$ excitations at LHC | The talk given at the XIth International Workshop High Energy Physics
and Quantum Field Theory, June 24- June 30, 2013, Saint Petersburg, Russia;
to be published in PoS; 8 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that in the decays $B_c(2P)\to B_c^* \gamma^\mathrm{hard}$,
$B_c(3P)\to B_c^* \gamma^\mathrm{hard}$ and $B_c(2S)\to B_c^* +\pi^+\pi^-$
followed by the decay $B_c^*\to B_c +\gamma^\mathrm{soft}$ the loss of the soft
photon $\gamma^\mathrm{soft}$ do not wash out peaks from the initial
excitations. The relative yields of $B_c^*$, 2P-wave, and 3P-wave states of
$B_c$ meson at LHC are estimated as function of transverse energy of emitted
photon $\gamma^\mathrm{hard}$. It is pointed out, that the decays $B_c(2S) \to
B_c(B_c^*)+\pi^+\pi^-$ could provide a new information about a $\sigma$
resonance nature.
| [
{
"created": "Tue, 23 Jul 2013 09:41:40 GMT",
"version": "v1"
}
] | 2013-07-24 | [
[
"Berezhnoy",
"A. V.",
""
],
[
"Likhoded",
"A. K.",
""
]
] | It is shown that in the decays $B_c(2P)\to B_c^* \gamma^\mathrm{hard}$, $B_c(3P)\to B_c^* \gamma^\mathrm{hard}$ and $B_c(2S)\to B_c^* +\pi^+\pi^-$ followed by the decay $B_c^*\to B_c +\gamma^\mathrm{soft}$ the loss of the soft photon $\gamma^\mathrm{soft}$ do not wash out peaks from the initial excitations. The relative yields of $B_c^*$, 2P-wave, and 3P-wave states of $B_c$ meson at LHC are estimated as function of transverse energy of emitted photon $\gamma^\mathrm{hard}$. It is pointed out, that the decays $B_c(2S) \to B_c(B_c^*)+\pi^+\pi^-$ could provide a new information about a $\sigma$ resonance nature. |
1010.0918 | Victor T. Kim | Igor M. Dremin and Victor T. Kim | Towards a common origin of the elliptic flow, ridge and alignment | 4 pages, few typos fixed, reference added, version published in JETP
Letters | Pisma Zh.Eksp.Teor.Fiz.92:720,2010; JETP Lett.92:652-653,2010 | 10.1134/S0021364010220029 | CERN-PH-TH/2010-221 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is claimed that elliptic flow, ridge and alignment are effects of
azimuthal asymmetry, which have a common origin evolving with primary energy
and stemming from the general structure of field-theoretical matrix elements.
It interrelates a new ridge-phenomenon, recently found at the LHC and RHIC,
with known coplanarity feature observed in collider jet physics as well as in
cosmic ray studies.
| [
{
"created": "Tue, 5 Oct 2010 15:28:47 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 2010 19:30:02 GMT",
"version": "v2"
}
] | 2011-03-28 | [
[
"Dremin",
"Igor M.",
""
],
[
"Kim",
"Victor T.",
""
]
] | It is claimed that elliptic flow, ridge and alignment are effects of azimuthal asymmetry, which have a common origin evolving with primary energy and stemming from the general structure of field-theoretical matrix elements. It interrelates a new ridge-phenomenon, recently found at the LHC and RHIC, with known coplanarity feature observed in collider jet physics as well as in cosmic ray studies. |
hep-ph/0012253 | Shi-Lin Zhu | Shi-Lin Zhu, S. Puglia, B.R. Holstein, and M. J. Ramsey-Musolf | Subleading corrections to parity violating pion photoproduction | latex, 10 pages + 2 figures | Phys.Rev.C64:035502,2001 | 10.1103/PhysRevC.64.035502 | null | hep-ph hep-ex nucl-ex nucl-th | null | We compute the photon asymmetry $B_\gamma$ for near threshold parity
violating (PV) pion photoproduction through sub-leading order. We show that
sub-leading contributions involve a new combination of PV couplings not
included in previous analyses of hadronic PV. We argue that existing
constraints on the leading order contribution to $B_\gamma$ -- obtained from
the PV $\gamma$-decay of $^{18}$F -- suggest that the impact of the subleading
contributions may be more significant than expected from naturalness argumen
| [
{
"created": "Tue, 19 Dec 2000 18:51:44 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 2000 16:13:02 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Mar 2001 16:23:49 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Zhu",
"Shi-Lin",
""
],
[
"Puglia",
"S.",
""
],
[
"Holstein",
"B. R.",
""
],
[
"Ramsey-Musolf",
"M. J.",
""
]
] | We compute the photon asymmetry $B_\gamma$ for near threshold parity violating (PV) pion photoproduction through sub-leading order. We show that sub-leading contributions involve a new combination of PV couplings not included in previous analyses of hadronic PV. We argue that existing constraints on the leading order contribution to $B_\gamma$ -- obtained from the PV $\gamma$-decay of $^{18}$F -- suggest that the impact of the subleading contributions may be more significant than expected from naturalness argumen |
hep-ph/9710469 | Hideyuki Abe | Hideyuki Abe | Attractive Central Potential in the SU(3) Skyrme Model | 16 pages, 9 embedded PS figures, ReVTeX, to appear in Phys. Rev. C | Phys.Rev.C56:3320-3325,1997 | 10.1103/PhysRevC.56.3320 | null | hep-ph | null | The interaction between the hyperon and the nucleon is investigated in the
SU(3) Skyrme model. The static potential, which is expanded in terms of the
modified SU(3) rotation matrices, is obtained for several orientations with the
Atiyah-Manton ansatz. The interaction is calculated for the NN, \LambdaN, and
\SigmaN systems. The medium-range attraction of the central potential between
\Lambda and N is obtained by considering the \Lambda-\Sigma mixing through the
intermediate state.
| [
{
"created": "Sat, 25 Oct 1997 01:24:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Abe",
"Hideyuki",
""
]
] | The interaction between the hyperon and the nucleon is investigated in the SU(3) Skyrme model. The static potential, which is expanded in terms of the modified SU(3) rotation matrices, is obtained for several orientations with the Atiyah-Manton ansatz. The interaction is calculated for the NN, \LambdaN, and \SigmaN systems. The medium-range attraction of the central potential between \Lambda and N is obtained by considering the \Lambda-\Sigma mixing through the intermediate state. |
hep-ph/0612212 | Gaetano Lambiase | G. Lambiase | Standard Model Extension with Gravity and Gravitational Baryogenesis | 5 pages, no figures | Phys.Lett.B642:9-12,2006 | 10.1016/j.physletb.2006.09.037 | null | hep-ph | null | The Standard Model Extension with the inclusion of gravity is studied in the
framework of the gravitational baryogenesis, a mechanism to generate the baryon
asymmetry based on the coupling between the Ricci scalar curvature and the
baryon current (\partial_\mu R)J^\mu. We show that, during the radiation era of
the expanding Universe, a non vanishing time derivative of the Ricci curvature
arises as a consequence of the coupling between the coefficients for the
Lorentz and CPT violation and Ricci's tensor. The order of magnitude for these
coefficients are derived from current bounds on baryon asymmetry.
| [
{
"created": "Mon, 18 Dec 2006 13:43:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lambiase",
"G.",
""
]
] | The Standard Model Extension with the inclusion of gravity is studied in the framework of the gravitational baryogenesis, a mechanism to generate the baryon asymmetry based on the coupling between the Ricci scalar curvature and the baryon current (\partial_\mu R)J^\mu. We show that, during the radiation era of the expanding Universe, a non vanishing time derivative of the Ricci curvature arises as a consequence of the coupling between the coefficients for the Lorentz and CPT violation and Ricci's tensor. The order of magnitude for these coefficients are derived from current bounds on baryon asymmetry. |
1206.6714 | Bernard Pire | B. Pire, K. Semenov-Tian-Shansky, L. Szymanowski | Nucleon-to-pion transition distribution amplitudes and backward
electroproduction of pions | proceedings of QNP 2012, Sixth International Conference on Quarks and
Nuclear Physics, April 16-20, 2012, Ecole Polytechnique, Palaiseau, France | null | null | CPHT-PC031.0612 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Baryon to meson transition distribution amplitudes (TDAs), non-diagonal
matrix elements of the nonlocal three quark operator between a nucleon and a
meson state, extend the concept of generalized parton distributions. These
non-perturbative objects which encode the information on three quark
correlations inside the nucleon may be accessed experimentally in backward
meson electroproduction reactions. We suggest a general framework for modelling
nucleon to pion (pi N) TDAs employing the spectral representation for pi N TDAs
in terms of quadruple distributions. The factorized Ansatz for quadruple
distributions with input from the soft-pion theorem for pi N TDAs is proposed.
It is to be complemented with a D-term like contribution from the nucleon
exchange in the cross channel.
We present our estimates of the unpolarized cross section and of the
transverse target single spin asymmetry for backward pion electroproduction
within the QCD collinear factorization approach in which the non-perturbative
part of the amplitude involves pi N TDAs. The cross section is sizable enough
to be studied in high luminosity experiments such as J-lab@12GeV and EIC.
| [
{
"created": "Thu, 28 Jun 2012 14:48:19 GMT",
"version": "v1"
}
] | 2012-06-29 | [
[
"Pire",
"B.",
""
],
[
"Semenov-Tian-Shansky",
"K.",
""
],
[
"Szymanowski",
"L.",
""
]
] | Baryon to meson transition distribution amplitudes (TDAs), non-diagonal matrix elements of the nonlocal three quark operator between a nucleon and a meson state, extend the concept of generalized parton distributions. These non-perturbative objects which encode the information on three quark correlations inside the nucleon may be accessed experimentally in backward meson electroproduction reactions. We suggest a general framework for modelling nucleon to pion (pi N) TDAs employing the spectral representation for pi N TDAs in terms of quadruple distributions. The factorized Ansatz for quadruple distributions with input from the soft-pion theorem for pi N TDAs is proposed. It is to be complemented with a D-term like contribution from the nucleon exchange in the cross channel. We present our estimates of the unpolarized cross section and of the transverse target single spin asymmetry for backward pion electroproduction within the QCD collinear factorization approach in which the non-perturbative part of the amplitude involves pi N TDAs. The cross section is sizable enough to be studied in high luminosity experiments such as J-lab@12GeV and EIC. |
1907.11644 | Dimitrios K. Papoulias | Dimitrios K. Papoulias | COHERENT constraints after the COHERENT-2020 quenching factor
measurement | 11 pages, 8 figures, 1 table, V2: used the new COHERENT quenching
factor, title modified accordingly, used a binned chi-squared analysis,
results updated, conclusions unchanged, matches the published version | Phys. Rev. D 102, 113004 (2020) | 10.1103/PhysRevD.102.113004 | IFIC/19-xxx | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently an improved quenching factor (QF) measurement for low-energy nuclear
recoils in CsI[Na] has been reported by the COHERENT Collaboration. The new
energy-dependent QF is characterized by a reduced systematic uncertainty and
leads to a better agreement between the experimental COHERENT data and the
Standard Model (SM) expectation. In this work, we report updated constraints on
parameters that describe the process of coherent elastic neutrino-nucleus
scattering within and beyond the SM, and we also present how the new QF affects
their interpretation.
| [
{
"created": "Fri, 26 Jul 2019 16:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Dec 2020 17:30:08 GMT",
"version": "v2"
}
] | 2021-01-04 | [
[
"Papoulias",
"Dimitrios K.",
""
]
] | Recently an improved quenching factor (QF) measurement for low-energy nuclear recoils in CsI[Na] has been reported by the COHERENT Collaboration. The new energy-dependent QF is characterized by a reduced systematic uncertainty and leads to a better agreement between the experimental COHERENT data and the Standard Model (SM) expectation. In this work, we report updated constraints on parameters that describe the process of coherent elastic neutrino-nucleus scattering within and beyond the SM, and we also present how the new QF affects their interpretation. |
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