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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9811300 | Bhaskar Dutta | E. Accomando, R. Arnowitt and B. Dutta | Trilepton Signal of Grand Unified Models at the Tevatron | 7 pages, latex, 6 figures | Phys.Lett.B475:176-183,2000 | 10.1016/S0370-2693(00)00071-X | CTP-TAMU-43-98 | hep-ph | null | At the Tevatron, the most promising channel to detect supersymmetry is three
leptons plus missing energy, where the leptons are $e$'s and/or $\mu$'s. This
final state appears from the production of chargino and second lighetst
neutralino. However in grand unified models with universal scalar masses at the
grand unified scale, this final state mostly consists of $\tau$'s which are
hard to detect. We show that for some regions of non universality in the scalar
masses at the GUT scale based on unifying groups like SU(5) or SO(10), the
final state mostly consists of 3$l$+${\rlap/E}_T$ and $\tau ll$+${\rlap/E}_T$.
The first mode has very high detection efficiency and the second one is
expected to have high detection efficency as well. We also show that these
models can have enough events in these modes to be detected in RUN II.
| [
{
"created": "Wed, 11 Nov 1998 00:43:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Accomando",
"E.",
""
],
[
"Arnowitt",
"R.",
""
],
[
"Dutta",
"B.",
""
]
] | At the Tevatron, the most promising channel to detect supersymmetry is three leptons plus missing energy, where the leptons are $e$'s and/or $\mu$'s. This final state appears from the production of chargino and second lighetst neutralino. However in grand unified models with universal scalar masses at the grand unified scale, this final state mostly consists of $\tau$'s which are hard to detect. We show that for some regions of non universality in the scalar masses at the GUT scale based on unifying groups like SU(5) or SO(10), the final state mostly consists of 3$l$+${\rlap/E}_T$ and $\tau ll$+${\rlap/E}_T$. The first mode has very high detection efficiency and the second one is expected to have high detection efficency as well. We also show that these models can have enough events in these modes to be detected in RUN II. |
2307.04710 | Michael Dine | Michael Dine | Remarks on the Axion Domain Wall Problem | 12 pages | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Theories in which the Peccei-Quinn phase transition occurs after inflation
tend to suffer from problematic domain walls. One possible solution involves a
small, explicit breaking ot the symmetry. But this raises other potential
issues. We review some aspects of axion domain walls, focussing especially on
this proposed solution. We argue, in disagreement with some recent literature,
that there is little axion radiation from the system until the domains actually
collapse. The same applies to gravitational waves and electromagnetic
radiation. The final stages of the collapse yields small numbers of extremely
energetic axions, which interact only rarely with ordinary matter, and are thus
relatively harmless. We then note that, if one accepts a remarkable
coincidence, this solution can be acceptable. We consider a possible
explanation of the required coincidence
| [
{
"created": "Mon, 10 Jul 2023 17:19:58 GMT",
"version": "v1"
}
] | 2023-07-13 | [
[
"Dine",
"Michael",
""
]
] | Theories in which the Peccei-Quinn phase transition occurs after inflation tend to suffer from problematic domain walls. One possible solution involves a small, explicit breaking ot the symmetry. But this raises other potential issues. We review some aspects of axion domain walls, focussing especially on this proposed solution. We argue, in disagreement with some recent literature, that there is little axion radiation from the system until the domains actually collapse. The same applies to gravitational waves and electromagnetic radiation. The final stages of the collapse yields small numbers of extremely energetic axions, which interact only rarely with ordinary matter, and are thus relatively harmless. We then note that, if one accepts a remarkable coincidence, this solution can be acceptable. We consider a possible explanation of the required coincidence |
2008.08596 | Jasmine Brewer | Jasmine Brewer, Jesse Thaler, and Andrew P. Turner | Data-driven quark and gluon jet modification in heavy-ion collisions | 7 pages, 4 figures | Phys. Rev. C 103, 021901 (2021) | 10.1103/PhysRevC.103.L021901 | MIT-CTP 5219 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Whether quark- and gluon-initiated jets are modified differently by the
quark-gluon plasma produced in heavy-ion collisions is a long-standing question
that has thus far eluded a definitive experimental answer. A crucial
complication for quark-gluon discrimination in both proton-proton and heavy-ion
collisions is that all measurements necessarily average over the (unknown)
quark-gluon composition of a jet sample. In the heavy-ion context, the
simultaneous modification of both the fractions and substructure of quark and
gluon jets by the quark-gluon plasma further obscures the interpretation. Here,
we demonstrate a fully data-driven method for separating quark and gluon
contributions to jet observables using a statistical technique called topic
modeling. Assuming that jet distributions are a mixture of underlying
"quark-like" and "gluon-like" distributions, we show how to extract quark and
gluon jet fractions and constituent multiplicity distributions as a function of
the jet transverse momentum. This proof-of-concept study is based on
proton-proton and heavy-ion collision events from the Monte Carlo event
generator Jewel with statistics accessible in Run 4 of the Large Hadron
Collider. These results suggest the potential for an experimental determination
of quark and gluon jet modifications.
| [
{
"created": "Wed, 19 Aug 2020 18:00:03 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Brewer",
"Jasmine",
""
],
[
"Thaler",
"Jesse",
""
],
[
"Turner",
"Andrew P.",
""
]
] | Whether quark- and gluon-initiated jets are modified differently by the quark-gluon plasma produced in heavy-ion collisions is a long-standing question that has thus far eluded a definitive experimental answer. A crucial complication for quark-gluon discrimination in both proton-proton and heavy-ion collisions is that all measurements necessarily average over the (unknown) quark-gluon composition of a jet sample. In the heavy-ion context, the simultaneous modification of both the fractions and substructure of quark and gluon jets by the quark-gluon plasma further obscures the interpretation. Here, we demonstrate a fully data-driven method for separating quark and gluon contributions to jet observables using a statistical technique called topic modeling. Assuming that jet distributions are a mixture of underlying "quark-like" and "gluon-like" distributions, we show how to extract quark and gluon jet fractions and constituent multiplicity distributions as a function of the jet transverse momentum. This proof-of-concept study is based on proton-proton and heavy-ion collision events from the Monte Carlo event generator Jewel with statistics accessible in Run 4 of the Large Hadron Collider. These results suggest the potential for an experimental determination of quark and gluon jet modifications. |
1906.08815 | Ayres Freitas | Ievgen Dubovyk, Ayres Freitas, Janusz Gluza, Tord Riemann, Johann
Usovitsch | Electroweak pseudo-observables and Z-boson form factors at two-loop
accuracy | 17 pages + references; v2: typos in eqs.(2.9) and (3.1) corrected,
non-factorizable corrections consistently included in form factors (Tabs.
5-7) | JHEP 1908 (2019) 113 | 10.1007/JHEP08(2019)113 | DESY 19-103, KW 19-005 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present Standard Model predictions for the complete set of
phenomenologically relevant electroweak precision pseudo-observables related to
the Z-boson: the leptonic and bottom-quark effective weak mixing angles
$\sin^2\theta_{\rm eff}^\ell$, $\sin^2\theta_{\rm eff}^b$, the Z-boson partial
decay widths $\Gamma_f$, where $f$ indicates any charged lepton, neutrino and
quark flavor (except for the top quark), as well as the total Z decay width
$\Gamma_Z$, the branching ratios $R_\ell$, $R_c$, $R_b$, and the hadronic cross
section $\sigma_{\rm had}^0$. The input parameters are the masses $M_Z$, $M_H$
and $m_t$, and the couplings $\alpha_s$, $\alpha$. The scheme dependence due to
the choice of $M_W$ or its alternative $G_\mu$ as a last input parameter is
also discussed. Recent substantial technical progress in the calculation of
Minkowskian massive higher-order Feynman integrals allows the calculation of
the complete electroweak two-loop radiative corrections to all the observables
mentioned. QCD contributions are included appropriately. Results are provided
in terms of simple and convenient parameterization formulae whose coefficients
have been determined from the full numerical multi-loop calculation. The size
of the missing electroweak three-loop or QCD higher-order corrections is
estimated. We briefly comment on the prospects for their calculation. Finally,
direct predictions for the $Z{\bar f}f$ vector and axial-vector form-factors
are given, including a discussion of separate order-by-order contributions.
| [
{
"created": "Thu, 20 Jun 2019 19:25:55 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jan 2020 20:42:41 GMT",
"version": "v2"
}
] | 2020-01-13 | [
[
"Dubovyk",
"Ievgen",
""
],
[
"Freitas",
"Ayres",
""
],
[
"Gluza",
"Janusz",
""
],
[
"Riemann",
"Tord",
""
],
[
"Usovitsch",
"Johann",
""
]
] | We present Standard Model predictions for the complete set of phenomenologically relevant electroweak precision pseudo-observables related to the Z-boson: the leptonic and bottom-quark effective weak mixing angles $\sin^2\theta_{\rm eff}^\ell$, $\sin^2\theta_{\rm eff}^b$, the Z-boson partial decay widths $\Gamma_f$, where $f$ indicates any charged lepton, neutrino and quark flavor (except for the top quark), as well as the total Z decay width $\Gamma_Z$, the branching ratios $R_\ell$, $R_c$, $R_b$, and the hadronic cross section $\sigma_{\rm had}^0$. The input parameters are the masses $M_Z$, $M_H$ and $m_t$, and the couplings $\alpha_s$, $\alpha$. The scheme dependence due to the choice of $M_W$ or its alternative $G_\mu$ as a last input parameter is also discussed. Recent substantial technical progress in the calculation of Minkowskian massive higher-order Feynman integrals allows the calculation of the complete electroweak two-loop radiative corrections to all the observables mentioned. QCD contributions are included appropriately. Results are provided in terms of simple and convenient parameterization formulae whose coefficients have been determined from the full numerical multi-loop calculation. The size of the missing electroweak three-loop or QCD higher-order corrections is estimated. We briefly comment on the prospects for their calculation. Finally, direct predictions for the $Z{\bar f}f$ vector and axial-vector form-factors are given, including a discussion of separate order-by-order contributions. |
1006.0002 | Irene Tamborra | Georg G. Raffelt and Irene Tamborra | Synchronization vs. decoherence of neutrino oscillations at intermediate
densities | 11 pages, including 13 figures. Clarifying paragraphs and 2 figures
added; results unchanged. Matches published version in PRD | Phys.Rev.D82:125004,2010 | 10.1103/PhysRevD.82.125004 | MPP-2010-55 | hep-ph astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study collective oscillations of a two-flavor neutrino system with
arbitrary but fixed density. In the vacuum limit, modes with different energies
quickly de-phase (kinematical decoherence), whereas in the limit of infinite
density they lock to each other (synchronization). For intermediate densities,
we find different classes of solutions. There is always a phase transition in
the sense of partial synchronization occurring only above a density threshold.
For small mixing angles, partial or complete decoherence can be induced by a
parametric resonance, introducing a new time scale to the problem, the final
outcome depending on the spectrum and mixing angle. We derive an analytic
relation that allows us to calculate the late-time degree of coherence based on
the spectrum alone.
| [
{
"created": "Mon, 31 May 2010 20:00:22 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Dec 2010 16:31:03 GMT",
"version": "v2"
}
] | 2010-12-24 | [
[
"Raffelt",
"Georg G.",
""
],
[
"Tamborra",
"Irene",
""
]
] | We study collective oscillations of a two-flavor neutrino system with arbitrary but fixed density. In the vacuum limit, modes with different energies quickly de-phase (kinematical decoherence), whereas in the limit of infinite density they lock to each other (synchronization). For intermediate densities, we find different classes of solutions. There is always a phase transition in the sense of partial synchronization occurring only above a density threshold. For small mixing angles, partial or complete decoherence can be induced by a parametric resonance, introducing a new time scale to the problem, the final outcome depending on the spectrum and mixing angle. We derive an analytic relation that allows us to calculate the late-time degree of coherence based on the spectrum alone. |
0911.0972 | Xian-Qiao Yu | Xian-Qiao Yu, Xiu-Li Zhou | Study of B_{c}\to J/\psi K decays in the perturbative QCD approach | 5 pages,1 figure | Phys.Rev.D81:037501,2010 | 10.1103/PhysRevD.81.037501 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, we calculate the branching ratio of B_c\to J/\psi K in the
framework of perturbative QCD approach based on k_T factorization. This decay
can occur only via tree level diagrams in the Standard Model. We find that the
branching ratio of B_c\to J/\psi K is about (1-3)\times10^{-4}. The large
branching ratio and the clear signals of the final states make the measurement
of B_c\to J/\psi K easily at LHC-b experiments.
| [
{
"created": "Thu, 5 Nov 2009 04:48:22 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Dec 2009 00:51:29 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Mar 2010 10:21:09 GMT",
"version": "v3"
}
] | 2010-04-06 | [
[
"Yu",
"Xian-Qiao",
""
],
[
"Zhou",
"Xiu-Li",
""
]
] | In this note, we calculate the branching ratio of B_c\to J/\psi K in the framework of perturbative QCD approach based on k_T factorization. This decay can occur only via tree level diagrams in the Standard Model. We find that the branching ratio of B_c\to J/\psi K is about (1-3)\times10^{-4}. The large branching ratio and the clear signals of the final states make the measurement of B_c\to J/\psi K easily at LHC-b experiments. |
1110.4376 | Martin Wolfgang Winkler | Rolf Kappl, Martin Wolfgang Winkler | Dark Matter after BESS-Polar II | 15 pages, 4 figures | null | 10.1103/PhysRevD.85.123522 | null | hep-ph astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The BESS-Polar collaboration has recently performed a precise measurement of
the local antiproton flux which is consistent with a pure secondary production
of antiprotons. We constrain a possible primary component originating from dark
matter pair-annihilations. We derive limits on the annihilation cross section
which are stronger than or comparable to those from the PAMELA satellite
experiment for dark matter masses up to 200 GeV. Especially, we exclude thermal
WIMPs with masses in the range 3-20 GeV if they annihilate dominantly into
quark pairs unless their cross section is velocity suppressed.
| [
{
"created": "Wed, 19 Oct 2011 20:01:49 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Kappl",
"Rolf",
""
],
[
"Winkler",
"Martin Wolfgang",
""
]
] | The BESS-Polar collaboration has recently performed a precise measurement of the local antiproton flux which is consistent with a pure secondary production of antiprotons. We constrain a possible primary component originating from dark matter pair-annihilations. We derive limits on the annihilation cross section which are stronger than or comparable to those from the PAMELA satellite experiment for dark matter masses up to 200 GeV. Especially, we exclude thermal WIMPs with masses in the range 3-20 GeV if they annihilate dominantly into quark pairs unless their cross section is velocity suppressed. |
1112.4433 | Taekoon Lee | Taekoon Lee | Estimation of the large order behavior of the plaquette | 7 pages. version published in Phys. Lett. B | Physics Letters B 711 (2012) pp. 360-363 | 10.1016/j.physletb.2012.04.017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The universality of vacuum condensate can be exploited to relate the infrared
renormalon caused large order behaviors of different processes. As an
application the normalization constant of the large order behavior of the
average plaquette is estimated using the Adler function.
| [
{
"created": "Mon, 19 Dec 2011 18:54:35 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jan 2012 16:55:03 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Apr 2012 14:45:34 GMT",
"version": "v3"
}
] | 2012-04-30 | [
[
"Lee",
"Taekoon",
""
]
] | The universality of vacuum condensate can be exploited to relate the infrared renormalon caused large order behaviors of different processes. As an application the normalization constant of the large order behavior of the average plaquette is estimated using the Adler function. |
1712.09695 | Sergey Ostapchenko | Sergey Ostapchenko and Marcus Bleicher | Rapidity Gap Survival in Enhanced Pomeron Scheme | null | null | 10.1140/epjc/s10052-018-5564-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the phenomenological Reggeon field theory framework to investigate
rapidity gap survival (RGS) probability for diffractive dijet production in
proton-proton collisions. In particular, we study in some detail rapidity gap
suppression due to elastic rescatterings of intermediate partons in the
underlying parton cascades, described by enhanced (Pomeron-Pomeron interaction)
diagrams. We demonstrate that such contributions play a subdominant role,
compared to the usual, so-called "eikonal", rapidity gap suppression due to
elastic rescatterings of constituent partons of the colliding protons. On the
other hand, the overall RGS factor proves to be sensitive to color fluctuations
in the proton. Hence, experimental data on diffractive dijet production can be
used to constrain the respective model approaches.
| [
{
"created": "Wed, 27 Dec 2017 22:25:27 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Ostapchenko",
"Sergey",
""
],
[
"Bleicher",
"Marcus",
""
]
] | We apply the phenomenological Reggeon field theory framework to investigate rapidity gap survival (RGS) probability for diffractive dijet production in proton-proton collisions. In particular, we study in some detail rapidity gap suppression due to elastic rescatterings of intermediate partons in the underlying parton cascades, described by enhanced (Pomeron-Pomeron interaction) diagrams. We demonstrate that such contributions play a subdominant role, compared to the usual, so-called "eikonal", rapidity gap suppression due to elastic rescatterings of constituent partons of the colliding protons. On the other hand, the overall RGS factor proves to be sensitive to color fluctuations in the proton. Hence, experimental data on diffractive dijet production can be used to constrain the respective model approaches. |
hep-ph/0307123 | Pran Nath | Pran Nath | Twenty Years of SUGRA | Invited talk at the International Conference BEYOND-2003, Schloss
Ringberg, Germany, June 10-14, 2003; 21 pages, Latex | null | null | null | hep-ph | null | A brief review is given of the developments of mSUGRA and its extensions
since the formulation of these models in 1982. Future directions and prospects
are also discussed.
| [
{
"created": "Wed, 9 Jul 2003 14:16:43 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jul 2003 14:24:57 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Nath",
"Pran",
""
]
] | A brief review is given of the developments of mSUGRA and its extensions since the formulation of these models in 1982. Future directions and prospects are also discussed. |
hep-ph/9710552 | Alexander Ignatiev | A.Yu.Ignatiev and G.C.Joshi | Hybrid $SU(2)\times U(1)$ models, electric charge nonconservation and
the photon mass | 17 pages, revtex | Chaos Solitons Fractals 10 (1999) 1 | null | UM-P-95/99, RCHEP-95/23 | hep-ph | null | Hybrid $SU(2) \times U(1)$ models are the models in which $SU(2) \times U(1)$
symmetry is broken down not only spontaneously (as in the Standard Model), but
also explicitely by adding a hard mass term for the U(1) field in the
lagrangian. We study the issue of electric charge nonconservation and
dequantization in these models. For this purpose we construct and analyze a
series of hybrid models with different scalar contents. We show that some of
these models posess an interesting property: the photon can remain massless (at
least, at the tree level) even though the electric charge is not conserved.
| [
{
"created": "Fri, 31 Oct 1997 02:47:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ignatiev",
"A. Yu.",
""
],
[
"Joshi",
"G. C.",
""
]
] | Hybrid $SU(2) \times U(1)$ models are the models in which $SU(2) \times U(1)$ symmetry is broken down not only spontaneously (as in the Standard Model), but also explicitely by adding a hard mass term for the U(1) field in the lagrangian. We study the issue of electric charge nonconservation and dequantization in these models. For this purpose we construct and analyze a series of hybrid models with different scalar contents. We show that some of these models posess an interesting property: the photon can remain massless (at least, at the tree level) even though the electric charge is not conserved. |
hep-ph/0202081 | Jonathan Feng | Jaime Alvarez-Muniz, Jonathan L. Feng, Francis Halzen, Tao Han, Dan
Hooper | Detecting Microscopic Black Holes with Neutrino Telescopes | 20 pages, 9 figures | Phys.Rev.D65:124015,2002 | 10.1103/PhysRevD.65.124015 | MIT-CTP-3221, UCI-TR-2001-43, MADPH-02-1255 | hep-ph astro-ph hep-ex | null | If spacetime has more than four dimensions, ultra-high energy cosmic rays may
create microscopic black holes. Black holes created by cosmic neutrinos in the
Earth will evaporate, and the resulting hadronic showers, muons, and taus may
be detected in neutrino telescopes below the Earth's surface. We simulate such
events in detail and consider black hole cross sections with and without an
exponential suppression factor. We find observable rates in both cases: for
conservative cosmogenic neutrino fluxes, several black hole events per year are
observable at the IceCube detector; for fluxes at the Waxman-Bahcall bound,
tens of events per year are possible. We also present zenith angle and energy
distributions for all three channels. The ability of neutrino telescopes to
differentiate hadrons, muons, and possibly taus, and to measure these
distributions provides a unique opportunity to identify black holes, to
experimentally constrain the form of black hole production cross sections, and
to study Hawking evaporation.
| [
{
"created": "Fri, 8 Feb 2002 16:02:57 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Alvarez-Muniz",
"Jaime",
""
],
[
"Feng",
"Jonathan L.",
""
],
[
"Halzen",
"Francis",
""
],
[
"Han",
"Tao",
""
],
[
"Hooper",
"Dan",
""
]
] | If spacetime has more than four dimensions, ultra-high energy cosmic rays may create microscopic black holes. Black holes created by cosmic neutrinos in the Earth will evaporate, and the resulting hadronic showers, muons, and taus may be detected in neutrino telescopes below the Earth's surface. We simulate such events in detail and consider black hole cross sections with and without an exponential suppression factor. We find observable rates in both cases: for conservative cosmogenic neutrino fluxes, several black hole events per year are observable at the IceCube detector; for fluxes at the Waxman-Bahcall bound, tens of events per year are possible. We also present zenith angle and energy distributions for all three channels. The ability of neutrino telescopes to differentiate hadrons, muons, and possibly taus, and to measure these distributions provides a unique opportunity to identify black holes, to experimentally constrain the form of black hole production cross sections, and to study Hawking evaporation. |
hep-ph/0509309 | Jonathan Feng | Jonathan L. Feng | ILC Cosmology | 18 pages, Plenary Colloquium presented at the 2005 International
Linear Collider Workshop, Stanford, California, USA, 18-22 March 2005 | null | null | UCI-TR-2005-34 | hep-ph astro-ph hep-ex | null | Recent breakthroughs in cosmology pose questions that require particle
physics answers. I review the problems of dark matter, baryogenesis, and dark
energy and discuss how particle colliders, particularly the International
Linear Collider, may advance our understanding of the contents and evolution of
the Universe.
| [
{
"created": "Tue, 27 Sep 2005 16:41:06 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Feng",
"Jonathan L.",
""
]
] | Recent breakthroughs in cosmology pose questions that require particle physics answers. I review the problems of dark matter, baryogenesis, and dark energy and discuss how particle colliders, particularly the International Linear Collider, may advance our understanding of the contents and evolution of the Universe. |
hep-ph/9908260 | Csaba Boros | C. Boros, J.T. Londergan and A.W. Thomas | Structure and Production of Lambda Baryons | 24 pages, 9 figures, minor changes | Phys.Rev.D61:014007,2000 | 10.1103/PhysRevD.61.014007 | ADP-99-31/T368, IU/NTC 99-01 | hep-ph hep-ex | null | We discuss the quark parton structure of the $\Lambda$ baryon and the
fragmentation of quarks into $\Lambda$ baryons. We show that the hyperfine
interaction, responsible for the $\Delta$-$N$ and $\Sigma^0$-$\Lambda$ mass
splittings, leads not only to sizeable SU(3) and SU(6) symmetry breaking in the
quark distributions of the $\Lambda$, but also to significant polarized
non-strange quark distributions. The same arguments suggest flavor asymmetric
quark fragmentation functions and non-zero polarized non-strange quark
fragmentation functions. The calculated fragmentation functions give a good
description of all measured observables. We predict significant positive
$\Lambda$ polarization in semi-inclusive DIS experiments while models based on
SU(3) flavor symmetry predict zero or negative $\Lambda$ polarization. Our
approach also provides a natural explanation for the dependence of the maximum
of the $\xi=\ln(1/z)$ spectrum on the mass of the particles produced in
$e^+e^-$ annihilation.
| [
{
"created": "Thu, 5 Aug 1999 03:22:53 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Aug 1999 02:13:37 GMT",
"version": "v2"
}
] | 2010-02-17 | [
[
"Boros",
"C.",
""
],
[
"Londergan",
"J. T.",
""
],
[
"Thomas",
"A. W.",
""
]
] | We discuss the quark parton structure of the $\Lambda$ baryon and the fragmentation of quarks into $\Lambda$ baryons. We show that the hyperfine interaction, responsible for the $\Delta$-$N$ and $\Sigma^0$-$\Lambda$ mass splittings, leads not only to sizeable SU(3) and SU(6) symmetry breaking in the quark distributions of the $\Lambda$, but also to significant polarized non-strange quark distributions. The same arguments suggest flavor asymmetric quark fragmentation functions and non-zero polarized non-strange quark fragmentation functions. The calculated fragmentation functions give a good description of all measured observables. We predict significant positive $\Lambda$ polarization in semi-inclusive DIS experiments while models based on SU(3) flavor symmetry predict zero or negative $\Lambda$ polarization. Our approach also provides a natural explanation for the dependence of the maximum of the $\xi=\ln(1/z)$ spectrum on the mass of the particles produced in $e^+e^-$ annihilation. |
1603.06875 | Phongpichit Channuie | Phongpichit Channuie (Walailak U.) and Peeravit Koad (Walailak U.) | Preheating after technicolor inflation | v4: 9 pages, 4 figures, minor modification, version accepted for
publication in Phys.Rev.D | Phys. Rev. D 94, 043528 (2016) | 10.1103/PhysRevD.94.043528 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the particle production due to parametric resonances in model
of inflation where the lightest composite state stemming from the minimal
walking technicolor theory plays the role of the inflaton. For model of
inflation, the effective theory couples non-minimally to gravity. Regarding the
preheating, we study in details a model of a composite inflaton field $\phi$
coupled to another scalar field $\chi$ with the interaction term
$g^{2}\phi^{2}\chi^{2}$. Particularly, in the Minkowski space, the stage of
parametric resonances can be described by the Mathieu equation. Interestingly,
we discover that broad resonances can be typically achieved and potentially
efficient in our model causing the number of particle density in this process
exponentially increases.
| [
{
"created": "Tue, 22 Mar 2016 17:14:31 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 2016 06:40:51 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Aug 2016 13:09:52 GMT",
"version": "v3"
},
{
"created": "Tue, 9 Aug 2016 04:08:21 GMT",
"version": "v4"
}
] | 2016-08-25 | [
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
],
[
"Koad",
"Peeravit",
"",
"Walailak U."
]
] | We investigate the particle production due to parametric resonances in model of inflation where the lightest composite state stemming from the minimal walking technicolor theory plays the role of the inflaton. For model of inflation, the effective theory couples non-minimally to gravity. Regarding the preheating, we study in details a model of a composite inflaton field $\phi$ coupled to another scalar field $\chi$ with the interaction term $g^{2}\phi^{2}\chi^{2}$. Particularly, in the Minkowski space, the stage of parametric resonances can be described by the Mathieu equation. Interestingly, we discover that broad resonances can be typically achieved and potentially efficient in our model causing the number of particle density in this process exponentially increases. |
hep-ph/0312309 | St\'ephane Lavignac | St\'ephane Lavignac | Flavour and CP Violation in the Lepton Sector and New Physics | 13 pages, 3 figures, Invited talk at Flavor Physics and CP Violation
(FPCP 2003), Paris, France, 3-6 June 2003. Reference added | null | null | null | hep-ph | null | We give a pedagogical review of flavour and CP violation in the lepton
sector, with a particular emphasis on new physics - and in particular
supersymmetric - contributions to flavour and CP violating observables
involving leptons.
| [
{
"created": "Sun, 21 Dec 2003 20:39:40 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jan 2004 20:57:08 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Lavignac",
"Stéphane",
""
]
] | We give a pedagogical review of flavour and CP violation in the lepton sector, with a particular emphasis on new physics - and in particular supersymmetric - contributions to flavour and CP violating observables involving leptons. |
2309.15380 | Hongxia Huang | Ye Yan, Xiaohuang Hu, Hongxia Huang, and Jialun Ping | Investigating excited $\Omega_c$ states from pentaquark perspective | 14 pages, 6 figures. arXiv admin note: text overlap with
arXiv:2211.12129 | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Inspired by the recent observation of new $\Omega_c^0$ states by the LHCb
Collaboration, we explore the excited $\Omega_{c}$ states from the pentaquark
perspective in the quark delocalization color screening model. Our results
indicate that the $\Omega_c(3185)$ can be well interpreted as a molecular $\Xi
D$ predominated resonance state with $J^P=1/2^-$. The $\Omega_c(3120)$ can also
be interpreted as a molecular $\Xi_c^* \bar{K}$ state with $J^P=3/2^-$ and a
new molecular state $\Xi^*_c \bar{K}^*$ with $J^P=5/2^-$ and a mass of 3527 MeV
is predicted, which is worth searching in the future. Other reported $\Omega_c$
states cannot be well described in the framework of pentaquark systems in
present work. The three-quark excited state, or the unquenched picture may be a
good explanation, which is worth further exploration.
| [
{
"created": "Wed, 27 Sep 2023 03:17:03 GMT",
"version": "v1"
}
] | 2023-09-28 | [
[
"Yan",
"Ye",
""
],
[
"Hu",
"Xiaohuang",
""
],
[
"Huang",
"Hongxia",
""
],
[
"Ping",
"Jialun",
""
]
] | Inspired by the recent observation of new $\Omega_c^0$ states by the LHCb Collaboration, we explore the excited $\Omega_{c}$ states from the pentaquark perspective in the quark delocalization color screening model. Our results indicate that the $\Omega_c(3185)$ can be well interpreted as a molecular $\Xi D$ predominated resonance state with $J^P=1/2^-$. The $\Omega_c(3120)$ can also be interpreted as a molecular $\Xi_c^* \bar{K}$ state with $J^P=3/2^-$ and a new molecular state $\Xi^*_c \bar{K}^*$ with $J^P=5/2^-$ and a mass of 3527 MeV is predicted, which is worth searching in the future. Other reported $\Omega_c$ states cannot be well described in the framework of pentaquark systems in present work. The three-quark excited state, or the unquenched picture may be a good explanation, which is worth further exploration. |
hep-ph/9712420 | Lucas Taylor | John Swain and Lucas Taylor | First determination of the quark mixing matrix element Vtb independent
of assumptions of unitarity | 4 pages, 2 figures | Phys.Rev. D58 (1998) 093006 | 10.1103/PhysRevD.58.093006 | null | hep-ph | null | We present a new method for the determination of the
Cabibbo-Kobayashi-Maskawa quark mixing matrix element $|V_{tb}|$ from
electroweak loop corrections, in particular those affecting the process $Z\to
b\bar{b}$. From a combined analysis of results from the LEP, SLC, Tevatron, and
neutrino scattering experiments we determine $|V_{tb}| = 0.77^{+0.18}_{-0.24}$.
This is the first determination of $|V_{tb}|$ which is independent of unitarity
assumptions.
| [
{
"created": "Wed, 17 Dec 1997 16:13:07 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Swain",
"John",
""
],
[
"Taylor",
"Lucas",
""
]
] | We present a new method for the determination of the Cabibbo-Kobayashi-Maskawa quark mixing matrix element $|V_{tb}|$ from electroweak loop corrections, in particular those affecting the process $Z\to b\bar{b}$. From a combined analysis of results from the LEP, SLC, Tevatron, and neutrino scattering experiments we determine $|V_{tb}| = 0.77^{+0.18}_{-0.24}$. This is the first determination of $|V_{tb}|$ which is independent of unitarity assumptions. |
hep-ph/0110405 | Alessandro Papa | R. Fiore, L. Jenkovszky, F. Paccanoni, A. Papa | $J/\psi$ photoproduction at HERA | 11 pages, 6 figures, uses axodraw.sty; one figure added, minor
changes in the text | Phys.Rev. D65 (2002) 077505 | 10.1103/PhysRevD.65.077505 | DFPD 01/TH/44, DFCAL-TH 01/6, BITP-01-20 | hep-ph | null | We revise and update an earlier model for $J/\psi$ photoproduction based on a
dipole Pomeron exchange. We show that the H1 and ZEUS experimental data
reported recently can be well fitted by a soft Pomeron alone.
| [
{
"created": "Wed, 31 Oct 2001 13:39:40 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2001 10:41:31 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Fiore",
"R.",
""
],
[
"Jenkovszky",
"L.",
""
],
[
"Paccanoni",
"F.",
""
],
[
"Papa",
"A.",
""
]
] | We revise and update an earlier model for $J/\psi$ photoproduction based on a dipole Pomeron exchange. We show that the H1 and ZEUS experimental data reported recently can be well fitted by a soft Pomeron alone. |
hep-ph/0612036 | Yue Chongxing | Chong-Xing Yue and Li-Na Wang | Non-universal gauge boson $Z'$ and the spin correlation of top quark
pair production at $e^{-}e^{+}$ colliders | 16 pages, 5 figures | J.Phys.G34:139-150,2007 | 10.1088/0954-3899/34/1/010 | null | hep-ph | null | In the off-diagonal basis, we discuss the contributions of the non-universal
gauge boson $Z'$ predicted by the topcolor-assisted technicolor ($TC2$) model
to the spin configurations and the spin correlation observable of the top quark
pair production via the process $e^{-}e^{+}\to t\bar{t}$. Our numerical results
show that the production cross sections for the like-spin states, which vanish
in the standard model, can be significantly large as $M_{Z'}\approx \sqrt{S}$.
With reasonable values of the $Z'$ mass $M_{Z'}$ and the coupling parameter
$k_{1}$,
$Z'$ exchange can generate large corrections to the spin correlation
observable.
| [
{
"created": "Tue, 5 Dec 2006 07:57:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Yue",
"Chong-Xing",
""
],
[
"Wang",
"Li-Na",
""
]
] | In the off-diagonal basis, we discuss the contributions of the non-universal gauge boson $Z'$ predicted by the topcolor-assisted technicolor ($TC2$) model to the spin configurations and the spin correlation observable of the top quark pair production via the process $e^{-}e^{+}\to t\bar{t}$. Our numerical results show that the production cross sections for the like-spin states, which vanish in the standard model, can be significantly large as $M_{Z'}\approx \sqrt{S}$. With reasonable values of the $Z'$ mass $M_{Z'}$ and the coupling parameter $k_{1}$, $Z'$ exchange can generate large corrections to the spin correlation observable. |
1007.4479 | Marco Frasca | Marco Frasca | Glueball spectrum and hadronic processes in low-energy QCD | 4 pages. Contribution to proceedings of QCD 10 Conference,
(Montpellier, France, 28th June - 3rd July 2010). Added references and
improved some contents | Nucl.Phys.Proc.Suppl.207-208:196-199,2010 | 10.1016/j.nuclphysbps.2010.10.051 | null | hep-ph hep-ex hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low-energy limit of quantum chromodynamics (QCD) is obtained using a mapping
theorem recently proved. This theorem states that, classically, solutions of a
massless quartic scalar field theory are approximate solutions of Yang-Mills
equations in the limit of the gauge coupling going to infinity. Low-energy QCD
is described by a Yukawa theory further reducible to a Nambu-Jona-Lasinio
model. At the leading order one can compute glue-quark interactions and one is
able to calculate the properties of the $\sigma$ and $\eta-\eta'$ mesons.
Finally, it is seen that all the physics of strong interactions, both in the
infrared and ultraviolet limit, is described by a single constant $\Lambda$
arising in the ultraviolet by dimensional transmutation and in the infrared as
an integration constant.
| [
{
"created": "Mon, 26 Jul 2010 14:56:01 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jul 2010 08:50:32 GMT",
"version": "v2"
}
] | 2010-12-23 | [
[
"Frasca",
"Marco",
""
]
] | Low-energy limit of quantum chromodynamics (QCD) is obtained using a mapping theorem recently proved. This theorem states that, classically, solutions of a massless quartic scalar field theory are approximate solutions of Yang-Mills equations in the limit of the gauge coupling going to infinity. Low-energy QCD is described by a Yukawa theory further reducible to a Nambu-Jona-Lasinio model. At the leading order one can compute glue-quark interactions and one is able to calculate the properties of the $\sigma$ and $\eta-\eta'$ mesons. Finally, it is seen that all the physics of strong interactions, both in the infrared and ultraviolet limit, is described by a single constant $\Lambda$ arising in the ultraviolet by dimensional transmutation and in the infrared as an integration constant. |
2303.07364 | Thorben Finke | Thorben Finke, Michael Kr\"amer, Alexander M\"uck and Jan T\"onshoff | Learning the language of QCD jets with transformers | Few references added; Version accepted for publication by JHEP | null | 10.1007/JHEP06(2023)184 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transformers have become the primary architecture for natural language
processing. In this study, we explore their use for auto-regressive density
estimation in high-energy jet physics, which involves working with a
high-dimensional space. We draw an analogy between sentences and words in
natural language and jets and their constituents in high-energy physics.
Specifically, we investigate density estimation for light QCD jets and
hadronically decaying boosted top jets. Since transformers allow easy sampling
from learned densities, we exploit their generative capability to assess the
quality of the density estimate. Our results indicate that the generated data
samples closely resemble the original data, as evidenced by the excellent
agreement of distributions such as particle multiplicity or jet mass.
Furthermore, the generated samples are difficult to distinguish from the
original data, even by a powerful supervised classifier. Given their
exceptional data processing capabilities, transformers could potentially be
trained directly on the massive LHC data sets to learn the probability
densities in high-energy jet physics.
| [
{
"created": "Mon, 13 Mar 2023 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Mar 2023 15:48:50 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jun 2023 14:05:35 GMT",
"version": "v3"
}
] | 2023-07-26 | [
[
"Finke",
"Thorben",
""
],
[
"Krämer",
"Michael",
""
],
[
"Mück",
"Alexander",
""
],
[
"Tönshoff",
"Jan",
""
]
] | Transformers have become the primary architecture for natural language processing. In this study, we explore their use for auto-regressive density estimation in high-energy jet physics, which involves working with a high-dimensional space. We draw an analogy between sentences and words in natural language and jets and their constituents in high-energy physics. Specifically, we investigate density estimation for light QCD jets and hadronically decaying boosted top jets. Since transformers allow easy sampling from learned densities, we exploit their generative capability to assess the quality of the density estimate. Our results indicate that the generated data samples closely resemble the original data, as evidenced by the excellent agreement of distributions such as particle multiplicity or jet mass. Furthermore, the generated samples are difficult to distinguish from the original data, even by a powerful supervised classifier. Given their exceptional data processing capabilities, transformers could potentially be trained directly on the massive LHC data sets to learn the probability densities in high-energy jet physics. |
hep-ph/0006298 | Jin Changhao | Changhao Jin | Inclusive Heavy Hadron Decays and Light-Cone Dynamics | talk presented at the Workshop on Light-Cone QCD and Nonperturbative
Hadron Physics, Adelaide, Australia, December 13-21, 1999. 9 pages | null | null | null | hep-ph | null | The governing role of light-cone dynamics in inclusive heavy hadron decay
processes is demonstrated. Nonperturbative QCD effects on the processes can be
systematically calculated using light-cone expansion and heavy quark effective
theory. The applications of the light-cone approach to studying electroweak and
strong interactions and hadron structure with semileptonic and radiative decays
of beauty hadrons are briefly reviewed.
| [
{
"created": "Tue, 27 Jun 2000 06:20:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jin",
"Changhao",
""
]
] | The governing role of light-cone dynamics in inclusive heavy hadron decay processes is demonstrated. Nonperturbative QCD effects on the processes can be systematically calculated using light-cone expansion and heavy quark effective theory. The applications of the light-cone approach to studying electroweak and strong interactions and hadron structure with semileptonic and radiative decays of beauty hadrons are briefly reviewed. |
2110.14662 | Ibrahim Safa | Ibrahim Safa, Jeffrey Lazar, Alex Pizzuto, Oswaldo Vasquez, Carlos A.
Arg\"uelles, Justin Vandenbroucke | TauRunner: A Public Python Program to Propagate Neutral and Charged
Leptons | 15 pages, 7 figures, 1 table. code available at
https://github.com/icecube/TauRunner | null | 10.1016/j.cpc.2022.108422 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the past decade IceCube's observations have revealed a flux of
astrophysical neutrinos extending to $10^{7}~\rm{GeV}$. The forthcoming
generation of neutrino observatories promises to grant further insight into the
high-energy neutrino sky, with sensitivity reaching energies up to
$10^{12}~\rm{GeV}$. At such high energies, a new set of effects becomes
relevant, which was not accounted for in the last generation of neutrino
propagation software. Thus, it is important to develop new simulations which
efficiently and accurately model lepton behavior at this scale. We present
TauRunner a PYTHON-based package that propagates neutral and charged leptons.
TauRunner supports propagation between $10~\rm{GeV}$ and $10^{12}~\rm{GeV}$.
The package accounts for all relevant secondary neutrinos produced in
charged-current tau neutrino interactions. Additionally, tau energy losses of
taus produced in neutrino interactions is taken into account, and treated
stochastically. Finally, TauRunner is broadly adaptable to divers experimental
setups, allowing for user-specified trajectories and propagation media,
neutrino cross sections, and initial spectra.
| [
{
"created": "Wed, 27 Oct 2021 18:00:03 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"Safa",
"Ibrahim",
""
],
[
"Lazar",
"Jeffrey",
""
],
[
"Pizzuto",
"Alex",
""
],
[
"Vasquez",
"Oswaldo",
""
],
[
"Argüelles",
"Carlos A.",
""
],
[
"Vandenbroucke",
"Justin",
""
]
] | In the past decade IceCube's observations have revealed a flux of astrophysical neutrinos extending to $10^{7}~\rm{GeV}$. The forthcoming generation of neutrino observatories promises to grant further insight into the high-energy neutrino sky, with sensitivity reaching energies up to $10^{12}~\rm{GeV}$. At such high energies, a new set of effects becomes relevant, which was not accounted for in the last generation of neutrino propagation software. Thus, it is important to develop new simulations which efficiently and accurately model lepton behavior at this scale. We present TauRunner a PYTHON-based package that propagates neutral and charged leptons. TauRunner supports propagation between $10~\rm{GeV}$ and $10^{12}~\rm{GeV}$. The package accounts for all relevant secondary neutrinos produced in charged-current tau neutrino interactions. Additionally, tau energy losses of taus produced in neutrino interactions is taken into account, and treated stochastically. Finally, TauRunner is broadly adaptable to divers experimental setups, allowing for user-specified trajectories and propagation media, neutrino cross sections, and initial spectra. |
2406.00531 | Mohammadmahdi Ettefaghi | M.M. Ettefaghi | Neutrino oscillation with minimal length uncertainty relation via wave
packet approach | 11 pages, 1 figure, to appear in PLB | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Theories of Quantum Gravity as well as string theory suggest the existence of
a minimal measurable length and the related Generalized Uncertainty Principle
(GUP). The universality of Quantum Gravity implies that the GUP influences
every quantum mechanical process. Neutrino oscillation as a quantum phenomenon
exhibits quantumness at macroscopic distances and could provide potentially a
suitable room for quantum foundation explorations. In this paper, we
perturbatively derive the neutrino oscillation probability based on the GUP and
by treating neutrinos as wave packets. We see that the GUP modifications are
dependent on the effective position width of the transition amplitude
$\sigma_x$ such that with the smaller $\sigma_x$ we can obtain a stronger bound
on the minimal length scale in comparison to what is expected from standard
model interactions. More explicitly, one can obtain an upper bound about
$5\times 10^{25}$ for the deformation parameter, $\beta_0$, with accelerator
neutrino experiments such as MINOS, provided that $\sigma_x\sim
10^{-15}\text{m}$ which is reasonable since the energy of these neutrinos is of
the order of a few GeV.
| [
{
"created": "Sat, 1 Jun 2024 18:46:38 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"Ettefaghi",
"M. M.",
""
]
] | Theories of Quantum Gravity as well as string theory suggest the existence of a minimal measurable length and the related Generalized Uncertainty Principle (GUP). The universality of Quantum Gravity implies that the GUP influences every quantum mechanical process. Neutrino oscillation as a quantum phenomenon exhibits quantumness at macroscopic distances and could provide potentially a suitable room for quantum foundation explorations. In this paper, we perturbatively derive the neutrino oscillation probability based on the GUP and by treating neutrinos as wave packets. We see that the GUP modifications are dependent on the effective position width of the transition amplitude $\sigma_x$ such that with the smaller $\sigma_x$ we can obtain a stronger bound on the minimal length scale in comparison to what is expected from standard model interactions. More explicitly, one can obtain an upper bound about $5\times 10^{25}$ for the deformation parameter, $\beta_0$, with accelerator neutrino experiments such as MINOS, provided that $\sigma_x\sim 10^{-15}\text{m}$ which is reasonable since the energy of these neutrinos is of the order of a few GeV. |
hep-ph/9908240 | Yasunori Nomura | K.-I. Izawa, Yasunori Nomura, and T. Yanagida | Cosmological Constants as Messenger between Branes | 7 pages, Latex | Prog.Theor.Phys.102:1181-1185,1999 | 10.1143/PTP.102.1181 | UT-856 | hep-ph | null | We present a supersymmetry-breaking scenario in which both the breaking in
the hidden sector with no-scale type supergravity and that in the observable
sector with gauge mediation are taken into account. The breaking scales in the
hidden and observable sectors are related through the vanishing condition of
the cosmological constant with a brane-world picture in mind. Suppressing
flavor-changing neutral currents, we can naturally obtain the gravitino,
Higgs(ino), and soft masses of the electroweak scale.
| [
{
"created": "Wed, 4 Aug 1999 09:45:55 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Izawa",
"K. -I.",
""
],
[
"Nomura",
"Yasunori",
""
],
[
"Yanagida",
"T.",
""
]
] | We present a supersymmetry-breaking scenario in which both the breaking in the hidden sector with no-scale type supergravity and that in the observable sector with gauge mediation are taken into account. The breaking scales in the hidden and observable sectors are related through the vanishing condition of the cosmological constant with a brane-world picture in mind. Suppressing flavor-changing neutral currents, we can naturally obtain the gravitino, Higgs(ino), and soft masses of the electroweak scale. |
hep-ph/0611193 | Nils Offen | Alexander Khodjamirian, Thomas Mannel, Nils Offen | Form Factors from Light-Cone Sum Rules with B-Meson Distribution
Amplitudes | 32 pages, 7 figures, the discussion of numerical results extended,
two references added, version to be published in Phys.Rev. D | Phys.Rev.D75:054013,2007 | 10.1103/PhysRevD.75.054013 | SI-HEP-2006-03 | hep-ph | null | New sum rules for $B\to \pi,K $ and $B\to \rho,K^*$ form factors are derived
from the correlation functions expanded near the light-cone in terms of B-meson
distribution amplitudes. The contributions of quark-antiquark and
quark-antiquark-gluon components in the B meson are taken into account. Models
for the B-meson three-particle distribution amplitudes are suggested, based on
QCD sum rules in HQET. Employing the new light-cone sum rules we calculate the
form factors at small momentum transfers, including $SU(3)_{fl}$ violation
effects. The results agree with the predictions of the conventional light-cone
sum rules.
| [
{
"created": "Tue, 14 Nov 2006 17:07:51 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2007 18:52:12 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Khodjamirian",
"Alexander",
""
],
[
"Mannel",
"Thomas",
""
],
[
"Offen",
"Nils",
""
]
] | New sum rules for $B\to \pi,K $ and $B\to \rho,K^*$ form factors are derived from the correlation functions expanded near the light-cone in terms of B-meson distribution amplitudes. The contributions of quark-antiquark and quark-antiquark-gluon components in the B meson are taken into account. Models for the B-meson three-particle distribution amplitudes are suggested, based on QCD sum rules in HQET. Employing the new light-cone sum rules we calculate the form factors at small momentum transfers, including $SU(3)_{fl}$ violation effects. The results agree with the predictions of the conventional light-cone sum rules. |
1609.06104 | Edmond Iancu | Miguel A. Escobedo and Edmond Iancu | Multi-particle correlations and KNO scaling in the medium-induced jet
evolution | 31 pages, 7 figures | null | 10.1007/JHEP12(2016)104 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gluon distribution produced via successive medium-induced
branchings by an energetic jet propagating through a weakly-coupled quark-gluon
plasma. We show that under suitable approximations the evolution of the jet can
be described as a classical stochastic process, which is exactly solvable. For
this process, we construct exact analytic solutions for all the n-point
correlation functions (the n-body densities in the space of energy). The
corresponding results for the one-point and the two-point functions were
already known, but those for the higher-point functions are new. These results
demonstrate strong correlations associated with the existence of common
ancestors in the branching process. By integrating these n-point functions over
the gluon energies, we deduce the mean gluon multiplicity $\langle N\rangle$ as
well as the higher moments $\langle N^p\rangle$ with $p\ge 2$. We find that the
multiplicities of the soft gluons are parametrically large and show a
remarkable regularity, known as Koba-Nielsen-Olesen (KNO) scaling: the reduced
moments $\langle N^p\rangle/\langle N\rangle^p$ are pure numbers, independent
of any of the physical parameters of the problem. We recognize a special
negative binomial distribution which is characterized by large statistical
fluctuations. These predictions can be tested in Pb+Pb collisions at the LHC,
via event-by-event measurements of the di-jet asymmetry.
| [
{
"created": "Tue, 20 Sep 2016 11:21:57 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Escobedo",
"Miguel A.",
""
],
[
"Iancu",
"Edmond",
""
]
] | We study the gluon distribution produced via successive medium-induced branchings by an energetic jet propagating through a weakly-coupled quark-gluon plasma. We show that under suitable approximations the evolution of the jet can be described as a classical stochastic process, which is exactly solvable. For this process, we construct exact analytic solutions for all the n-point correlation functions (the n-body densities in the space of energy). The corresponding results for the one-point and the two-point functions were already known, but those for the higher-point functions are new. These results demonstrate strong correlations associated with the existence of common ancestors in the branching process. By integrating these n-point functions over the gluon energies, we deduce the mean gluon multiplicity $\langle N\rangle$ as well as the higher moments $\langle N^p\rangle$ with $p\ge 2$. We find that the multiplicities of the soft gluons are parametrically large and show a remarkable regularity, known as Koba-Nielsen-Olesen (KNO) scaling: the reduced moments $\langle N^p\rangle/\langle N\rangle^p$ are pure numbers, independent of any of the physical parameters of the problem. We recognize a special negative binomial distribution which is characterized by large statistical fluctuations. These predictions can be tested in Pb+Pb collisions at the LHC, via event-by-event measurements of the di-jet asymmetry. |
1907.06927 | Franziska Hagelstein | Franziska Hagelstein (AEC Bern) and Vladimir Pascalutsa (JGU Mainz) | Pseudoscalar-Meson Contributions to g-2 via Schwinger's Sum Rule | Contribution to the proceedings of the 9th International Workshop on
Chiral Dynamics, 17-21 September 2018 (Durham, NC, USA). 7 pages, 7 figures,
2 tables | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Schwinger sum rule is presented as a new promising tool to study the
hadronic contributions to the muon anomalous magnetic moment. In particular, we
show preliminary results for the light-by-light scattering contribution of
pseudoscalar mesons.
| [
{
"created": "Tue, 16 Jul 2019 10:18:03 GMT",
"version": "v1"
}
] | 2019-07-17 | [
[
"Hagelstein",
"Franziska",
"",
"AEC Bern"
],
[
"Pascalutsa",
"Vladimir",
"",
"JGU Mainz"
]
] | The Schwinger sum rule is presented as a new promising tool to study the hadronic contributions to the muon anomalous magnetic moment. In particular, we show preliminary results for the light-by-light scattering contribution of pseudoscalar mesons. |
0803.4161 | Tania Robens | J. Kalinowski, W. Kilian, J. Reuter, T. Robens, K. Rolbiecki | (N)LO Simulation of Chargino Production and Decay | 10 pages, 6 figures; Talk presented at the Cracow Epiphany Conference
on LHC Physics 2008; Submitted to Acta Physica Polonica B | Acta Phys.Polon.B39:1705-1714,2008 | null | PITHA 08/08, SFB-CPP-08-20 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider NLO chargino production and decays at the ILC. For this, we
present an NLO extension of the Monte Carlo Event Generator Whizard including
the NLO production. For photonic corrections, we use both a fixed order and a
resummation approach. The latter method evades the problem of negative event
weights and automatically includes leading higher order corrections. We present
results for cross sections and event generation for both methods. As a first
step towards a full NLO Monte Carlo, we consider a LO implementation of the
chargino production and subsequent leptonic decay and investigate the precision
of the sneutrino mass determination by means of lepton energy distributions in
chargino decays. The SM and SUSY backgrounds are included in our study using
full matrix elements as well as smearing effects from ISR and beamstrahlung.
Without using energy distribution fits, the sneutrino mass can be determined
with an error in the percent regime.
| [
{
"created": "Fri, 28 Mar 2008 16:45:27 GMT",
"version": "v1"
}
] | 2008-12-19 | [
[
"Kalinowski",
"J.",
""
],
[
"Kilian",
"W.",
""
],
[
"Reuter",
"J.",
""
],
[
"Robens",
"T.",
""
],
[
"Rolbiecki",
"K.",
""
]
] | We consider NLO chargino production and decays at the ILC. For this, we present an NLO extension of the Monte Carlo Event Generator Whizard including the NLO production. For photonic corrections, we use both a fixed order and a resummation approach. The latter method evades the problem of negative event weights and automatically includes leading higher order corrections. We present results for cross sections and event generation for both methods. As a first step towards a full NLO Monte Carlo, we consider a LO implementation of the chargino production and subsequent leptonic decay and investigate the precision of the sneutrino mass determination by means of lepton energy distributions in chargino decays. The SM and SUSY backgrounds are included in our study using full matrix elements as well as smearing effects from ISR and beamstrahlung. Without using energy distribution fits, the sneutrino mass can be determined with an error in the percent regime. |
1003.5360 | LiPing Sun | Peng Sun, Li-Ping Sun, Cong-Feng Qiao | The Next-to-Leading Order Corrections to Top Quark Decays to Heavy
Quarkonia | 14 pages, 7 figures. Typos and misspellings are corrected, numerical
results and conclusions remain | Phys.Rev.D81:114035,2010 | 10.1103/PhysRevD.81.114035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay widths of top quark to S-wave $b\bar{c}$ and $b\bar{b}$ bound
states are evaluated at the next-to-leading(NLO) accuracy in strong
interaction. Numerical calculation shows that the NLO corrections to these
processes are remarkable. The quantum chromodynamics(QCD) renormalization scale
dependence of the results are obviously depressed, and hence the uncertainties
lying in the leading order calculation are reduced.
| [
{
"created": "Sun, 28 Mar 2010 11:22:21 GMT",
"version": "v1"
},
{
"created": "Mon, 24 May 2010 02:58:21 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Sun",
"Peng",
""
],
[
"Sun",
"Li-Ping",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | The decay widths of top quark to S-wave $b\bar{c}$ and $b\bar{b}$ bound states are evaluated at the next-to-leading(NLO) accuracy in strong interaction. Numerical calculation shows that the NLO corrections to these processes are remarkable. The quantum chromodynamics(QCD) renormalization scale dependence of the results are obviously depressed, and hence the uncertainties lying in the leading order calculation are reduced. |
hep-ph/0502255 | Marco Serone | Giuliano Panico and Marco Serone | The Electroweak Phase Transition on Orbifolds with Gauge-Higgs
Unification | 35 pages, 34 figures; v2: discussion on higher loop contributions
improved, two figures added, minor corrections | JHEP 0505:024,2005 | 10.1088/1126-6708/2005/05/024 | SISSA-15/2005/EP | hep-ph hep-th | null | The dynamics of five dimensional Wilson line phases at finite temperature is
studied in the one-loop approximation. We show that at temperatures of order T
\sim 1/L, where L is the length of the compact space, the gauge symmetry is
always restored and the electroweak phase transition appears to be of first
order.
Particular attention is devoted to the study of a recently proposed five
dimensional orbifold model (on S1/Z2) where the Wilson line phase is identified
with the Higgs field (gauge-Higgs unification). Interestingly enough, an
estimate of the leading higher-loop ``daisy'' (or ``ring'') diagram
contributions to the effective potential in a simple five dimensional model,
seems to suggest that the electroweak phase transition can be studied in
perturbation theory even for Higgs masses above the current experimental limit
of 114 GeV. The transition is still of first order for such values of the Higgs
mass. If large localized gauge kinetic terms are present, the transition might
be strong enough to give baryogenesis at the electroweak transition.
| [
{
"created": "Mon, 28 Feb 2005 19:17:10 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2005 09:46:23 GMT",
"version": "v2"
}
] | 2010-02-03 | [
[
"Panico",
"Giuliano",
""
],
[
"Serone",
"Marco",
""
]
] | The dynamics of five dimensional Wilson line phases at finite temperature is studied in the one-loop approximation. We show that at temperatures of order T \sim 1/L, where L is the length of the compact space, the gauge symmetry is always restored and the electroweak phase transition appears to be of first order. Particular attention is devoted to the study of a recently proposed five dimensional orbifold model (on S1/Z2) where the Wilson line phase is identified with the Higgs field (gauge-Higgs unification). Interestingly enough, an estimate of the leading higher-loop ``daisy'' (or ``ring'') diagram contributions to the effective potential in a simple five dimensional model, seems to suggest that the electroweak phase transition can be studied in perturbation theory even for Higgs masses above the current experimental limit of 114 GeV. The transition is still of first order for such values of the Higgs mass. If large localized gauge kinetic terms are present, the transition might be strong enough to give baryogenesis at the electroweak transition. |
0707.1275 | Agnieszka Grzeli\'nska | Henryk Czyz and Agnieszka Grzelinska | Radiative return physics program within EURIDICE network | Presented by H. Czyz at The Final EURIDICE Meeting "Effective
theories of colours and flavours: from EURODAPHNE to EURIDICE", Kazimierz,
Poland, 24-27 August, 2006, minor linquistic changes | ActaPhys.Polon.B38:2989-2998,2007 | null | TTP07-15 | hep-ph hep-ex | null | A short review of both theoretical and experimental aspects of the radiative
return method is presented with the emphasize on the results obtained within
the EURIDICE network. It is shown that the method gives not only possibility of
an independent from the scan method measurement of the hadronic cross section,
but also can provide information concerning details of the hadronic
interactions.
| [
{
"created": "Mon, 9 Jul 2007 15:07:23 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Aug 2007 07:22:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Czyz",
"Henryk",
""
],
[
"Grzelinska",
"Agnieszka",
""
]
] | A short review of both theoretical and experimental aspects of the radiative return method is presented with the emphasize on the results obtained within the EURIDICE network. It is shown that the method gives not only possibility of an independent from the scan method measurement of the hadronic cross section, but also can provide information concerning details of the hadronic interactions. |
hep-ph/9308277 | null | Ann E. Nelson and Lisa Randall | Naturally Large Tan $\beta$ | 8 pages (uses harvmac), UCSD/PTH 93-24, MIT-CTP-2230 | Phys.Lett.B316:516-520,1993 | 10.1016/0370-2693(93)91037-N | null | hep-ph | null | We show that if there are only two Higgs doublets in the supersymmetric
standard model, large $\tan\beta$ requires a fine tuning in the parameters of
the Lagrangian of order ($1/\tan\beta$), which cannot be explained by any
approximate symmetry. With an extended Higgs sector, large $\tan\beta$ can be
natural. We give an explicit example with four doublets in which it is possible
to achieve large $\tan\beta$ as a result of an approximate symmetry, without
any light superpartners. The approximate symmetry can be extended to explain
all the hierarchies in the quark mass matrix.
| [
{
"created": "Sun, 15 Aug 1993 22:56:28 GMT",
"version": "v1"
}
] | 2009-09-15 | [
[
"Nelson",
"Ann E.",
""
],
[
"Randall",
"Lisa",
""
]
] | We show that if there are only two Higgs doublets in the supersymmetric standard model, large $\tan\beta$ requires a fine tuning in the parameters of the Lagrangian of order ($1/\tan\beta$), which cannot be explained by any approximate symmetry. With an extended Higgs sector, large $\tan\beta$ can be natural. We give an explicit example with four doublets in which it is possible to achieve large $\tan\beta$ as a result of an approximate symmetry, without any light superpartners. The approximate symmetry can be extended to explain all the hierarchies in the quark mass matrix. |
1307.0574 | Jiajun Wu | Jia-Jun Wu and Bing-Song Zou | Hyperon production from neutrino-nucleon reaction | 19 pages, 10 figures | null | 10.1007/s00601-015-0973-0 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutrino induced hyperon production processes $\bar{\nu}_{e/\mu} + p \to
e^+/\mu^+ + \pi + \Lambda/\Sigma$ may provide a unique clean place for studying
low energy $\pi\Lambda/\Sigma$ interaction and hyperon resonances below $KN$
threshold. The production rates for some neutrino induced hyperon production
processes are estimated with theoretical models. Suggestions are made for the
study of hyperon production from neutrino-nucleon reaction at present and
future neutrino facilities.
| [
{
"created": "Tue, 2 Jul 2013 02:20:54 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Apr 2015 06:19:02 GMT",
"version": "v2"
}
] | 2015-04-14 | [
[
"Wu",
"Jia-Jun",
""
],
[
"Zou",
"Bing-Song",
""
]
] | The neutrino induced hyperon production processes $\bar{\nu}_{e/\mu} + p \to e^+/\mu^+ + \pi + \Lambda/\Sigma$ may provide a unique clean place for studying low energy $\pi\Lambda/\Sigma$ interaction and hyperon resonances below $KN$ threshold. The production rates for some neutrino induced hyperon production processes are estimated with theoretical models. Suggestions are made for the study of hyperon production from neutrino-nucleon reaction at present and future neutrino facilities. |
2007.05345 | Rayan Haindl | Vittorio Del Duca, Claude Duhr, Rayan Haindl, Achilleas Lazopoulos and
Martin Michel | Tree-level splitting amplitudes for a gluon into four collinear partons | 31 pages, 3 figures. arXiv admin note: substantial text overlap with
arXiv:1912.06425 | null | 10.1007/JHEP10(2020)093 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute in conventional dimensional regularisation the tree-level
splitting amplitudes for a gluon parent which splits into four collinear
partons. This is part of the universal infrared behaviour of the QCD scattering
amplitudes at next- to-next-to-next-to-leading order (N$^3$LO) in the strong
coupling constant. Combined with our earlier results for a quark parent, this
completes the set of tree-level splitting amplitudes required at this order. We
also study iterated collinear limits where a subset of the four collinear
partons become themselves collinear.
| [
{
"created": "Wed, 8 Jul 2020 20:18:48 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Del Duca",
"Vittorio",
""
],
[
"Duhr",
"Claude",
""
],
[
"Haindl",
"Rayan",
""
],
[
"Lazopoulos",
"Achilleas",
""
],
[
"Michel",
"Martin",
""
]
] | We compute in conventional dimensional regularisation the tree-level splitting amplitudes for a gluon parent which splits into four collinear partons. This is part of the universal infrared behaviour of the QCD scattering amplitudes at next- to-next-to-next-to-leading order (N$^3$LO) in the strong coupling constant. Combined with our earlier results for a quark parent, this completes the set of tree-level splitting amplitudes required at this order. We also study iterated collinear limits where a subset of the four collinear partons become themselves collinear. |
1512.03001 | Mikl\'os Horv\'ath | M. Horv\'ath, A. Jakov\'ac | Shear viscosity over entropy density ratio with extended quasi-particles | 13 pages, 7 figures, uses revtex4-1; published version | Phys. Rev. D 93, 056010 (2016) | 10.1103/PhysRevD.93.056010 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an effective field theory description of beyond-quasi-particle
excitations aiming to associate the transport properties of the system with the
spectral density of states. Tuning various properties of the many-particle
correlations, we investigate how the robust microscopic features are translated
into the macroscopic observables like shear viscosity and entropy density. The
liquid-gas crossover is analysed using several examples. A thermal constraint
on the fluidity measure, the ratio of shear viscosity to entropy density, is
discussed.
| [
{
"created": "Wed, 9 Dec 2015 19:26:29 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 2016 16:24:27 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Mar 2016 16:31:21 GMT",
"version": "v3"
}
] | 2016-03-30 | [
[
"Horváth",
"M.",
""
],
[
"Jakovác",
"A.",
""
]
] | We consider an effective field theory description of beyond-quasi-particle excitations aiming to associate the transport properties of the system with the spectral density of states. Tuning various properties of the many-particle correlations, we investigate how the robust microscopic features are translated into the macroscopic observables like shear viscosity and entropy density. The liquid-gas crossover is analysed using several examples. A thermal constraint on the fluidity measure, the ratio of shear viscosity to entropy density, is discussed. |
2302.05383 | Roy Forestano | Roy T. Forestano, Konstantin T. Matchev, Katia Matcheva, Alexander
Roman, Eyup B. Unlu, Sarunas Verner | Discovering Sparse Representations of Lie Groups with Machine Learning | 14 pages, 6 figures | null | 10.1016/j.physletb.2023.138086 | null | hep-ph cs.LG math-ph math.GR math.MP | http://creativecommons.org/licenses/by/4.0/ | Recent work has used deep learning to derive symmetry transformations, which
preserve conserved quantities, and to obtain the corresponding algebras of
generators. In this letter, we extend this technique to derive sparse
representations of arbitrary Lie algebras. We show that our method reproduces
the canonical (sparse) representations of the generators of the Lorentz group,
as well as the $U(n)$ and $SU(n)$ families of Lie groups. This approach is
completely general and can be used to find the infinitesimal generators for any
Lie group.
| [
{
"created": "Fri, 10 Feb 2023 17:12:05 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Forestano",
"Roy T.",
""
],
[
"Matchev",
"Konstantin T.",
""
],
[
"Matcheva",
"Katia",
""
],
[
"Roman",
"Alexander",
""
],
[
"Unlu",
"Eyup B.",
""
],
[
"Verner",
"Sarunas",
""
]
] | Recent work has used deep learning to derive symmetry transformations, which preserve conserved quantities, and to obtain the corresponding algebras of generators. In this letter, we extend this technique to derive sparse representations of arbitrary Lie algebras. We show that our method reproduces the canonical (sparse) representations of the generators of the Lorentz group, as well as the $U(n)$ and $SU(n)$ families of Lie groups. This approach is completely general and can be used to find the infinitesimal generators for any Lie group. |
0803.0960 | Andrzej Czarnecki | Alexey Pak and Andrzej Czarnecki | Mass effects in muon and semileptonic b -> c decays | 5 pages, 2 figures | Phys.Rev.Lett.100:241807,2008 | 10.1103/PhysRevLett.100.241807 | Alberta Thy 12-08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum chromodynamics (QCD) effects in the semileptonic decay b -> c l nu
are evaluated to the second order in the coupling constant, O(alpha_s^2), and
to several orders in the expansion in quark masses, m_c/m_b. Corrections are
calculated for the total decay rate as well as for the first two moments of the
lepton energy and the hadron system energy distributions. Applied to the muon
decay, they decrease its predicted rate by -0.43 ppm.
| [
{
"created": "Thu, 6 Mar 2008 20:25:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pak",
"Alexey",
""
],
[
"Czarnecki",
"Andrzej",
""
]
] | Quantum chromodynamics (QCD) effects in the semileptonic decay b -> c l nu are evaluated to the second order in the coupling constant, O(alpha_s^2), and to several orders in the expansion in quark masses, m_c/m_b. Corrections are calculated for the total decay rate as well as for the first two moments of the lepton energy and the hadron system energy distributions. Applied to the muon decay, they decrease its predicted rate by -0.43 ppm. |
1312.0770 | Magno Machado | G. Sampaio dos Santos, M.V.T. Machado | Exclusive photoproduction of quarkonium in proton-nucleus collisions at
energies available at the CERN Large Hadron Collider | 05 pages, 5 figures. Version to be published in Phys. Rev. C | Phys. Rev. C 89, 025201 (2014) | 10.1103/PhysRevC.89.025201 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the coherent photoproduction of psi(1S), psi(2S)
and Upsilon (1S) states in the proton-nucleus collisions in the LHC energies.
Predictions for the rapidity distributions are presented using the color dipole
formalism and including saturation effects that are expected to be relevant at
high energies. Calculations are done at the energy 5.02 TeV and also for the
next LHC run at 8.8 TeV in proton-lead mode. Discussion is performed on the
main theoretical uncertainties associated to the calculations.
| [
{
"created": "Tue, 3 Dec 2013 11:19:31 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2014 19:04:31 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Jun 2014 16:46:31 GMT",
"version": "v3"
}
] | 2014-06-19 | [
[
"Santos",
"G. Sampaio dos",
""
],
[
"Machado",
"M. V. T.",
""
]
] | In this work we investigate the coherent photoproduction of psi(1S), psi(2S) and Upsilon (1S) states in the proton-nucleus collisions in the LHC energies. Predictions for the rapidity distributions are presented using the color dipole formalism and including saturation effects that are expected to be relevant at high energies. Calculations are done at the energy 5.02 TeV and also for the next LHC run at 8.8 TeV in proton-lead mode. Discussion is performed on the main theoretical uncertainties associated to the calculations. |
1406.3439 | Tom\'a\v{s} Brauner | Jens O. Andersen, Tomas Brauner, Christoph P. Hofmann, Aleksi Vuorinen | Effective Lagrangians for quantum many-body systems | 45 pages | JHEP08(2014)088 | 10.1007/JHEP08(2014)088 | HIP-2014-17/TH | hep-ph cond-mat.str-el hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The low-energy and low-momentum dynamics of systems with a spontaneously
broken continuous symmetry is dominated by the ensuing Nambu-Goldstone bosons.
It can be conveniently encoded in a model-independent effective field theory
whose structure is fixed by symmetry up to a set of effective coupling
constants. We construct the most general effective Lagrangian for the
Nambu-Goldstone bosons of spontaneously broken global internal symmetry up to
the fourth order in derivatives. Rotational invariance and spatial
dimensionality of one, two or three are assumed in order to obtain compact
explicit expressions, but our method is completely general and can be applied
without modifications to condensed matter systems with a discrete space group
as well as to higher-dimensional theories. The general low-energy effective
Lagrangian for relativistic systems follows as a special case. We also discuss
the effects of explicit symmetry breaking and classify the corresponding terms
in the Lagrangian. Diverse examples are worked out in order to make the results
accessible to a wide theoretical physics community.
| [
{
"created": "Fri, 13 Jun 2014 07:13:45 GMT",
"version": "v1"
}
] | 2014-08-19 | [
[
"Andersen",
"Jens O.",
""
],
[
"Brauner",
"Tomas",
""
],
[
"Hofmann",
"Christoph P.",
""
],
[
"Vuorinen",
"Aleksi",
""
]
] | The low-energy and low-momentum dynamics of systems with a spontaneously broken continuous symmetry is dominated by the ensuing Nambu-Goldstone bosons. It can be conveniently encoded in a model-independent effective field theory whose structure is fixed by symmetry up to a set of effective coupling constants. We construct the most general effective Lagrangian for the Nambu-Goldstone bosons of spontaneously broken global internal symmetry up to the fourth order in derivatives. Rotational invariance and spatial dimensionality of one, two or three are assumed in order to obtain compact explicit expressions, but our method is completely general and can be applied without modifications to condensed matter systems with a discrete space group as well as to higher-dimensional theories. The general low-energy effective Lagrangian for relativistic systems follows as a special case. We also discuss the effects of explicit symmetry breaking and classify the corresponding terms in the Lagrangian. Diverse examples are worked out in order to make the results accessible to a wide theoretical physics community. |
1811.07923 | Jose Alonso Carpio Dumler | Jose Carpio, Eduardo Massoni and Alberto Gago | Testing quantum decoherence at DUNE | null | Phys. Rev. D 100, 015035 (2019) | 10.1103/PhysRevD.100.015035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address some theoretical issues of the quantum decoherence phenomenon
within the neutrino oscillation framework and carry out various tests under
DUNE simulated experimental environment. On the theoretical side, we provide a
general expression for an invariant decoherence matrix under a quantum basis
rotation. On the simulated experimental side, considering a rotation invariant
and a non-invariant decoherence matrix, we study the impact on the fitting of
the standard oscillation parameters, the sensitivity in the mass hierarchy and
CP violation, combining the neutrino and antineutrino mode and all available
neutrino oscillation probabilities channels. Furthermore, a sensitivity for the
decoherence parameter of order $10^{-24}\text{GeV}$ at 3$\sigma$, is obtained
for our best case.
| [
{
"created": "Mon, 19 Nov 2018 19:02:06 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2020 04:06:59 GMT",
"version": "v2"
}
] | 2020-05-20 | [
[
"Carpio",
"Jose",
""
],
[
"Massoni",
"Eduardo",
""
],
[
"Gago",
"Alberto",
""
]
] | We address some theoretical issues of the quantum decoherence phenomenon within the neutrino oscillation framework and carry out various tests under DUNE simulated experimental environment. On the theoretical side, we provide a general expression for an invariant decoherence matrix under a quantum basis rotation. On the simulated experimental side, considering a rotation invariant and a non-invariant decoherence matrix, we study the impact on the fitting of the standard oscillation parameters, the sensitivity in the mass hierarchy and CP violation, combining the neutrino and antineutrino mode and all available neutrino oscillation probabilities channels. Furthermore, a sensitivity for the decoherence parameter of order $10^{-24}\text{GeV}$ at 3$\sigma$, is obtained for our best case. |
hep-ph/0311104 | Abdelkader-Salim Safir | A. Salim Safir (Munich U.) | CP Violation in B Decays within QCD Factorization | 3 pages; 2 figures; To appear in the proceedings of International
Europhysics Conference on High-Energy Physics (HEP 2003), Aachen, Germany,
17-23 Jul 2003 | Eur.Phys.J.C33:s373-s375,2004 | 10.1140/epjcd/s2004-03-1831-x | LMU 26/03 | hep-ph | null | We analyze the extraction of weak phases from CP violation in
$B\to\pi^+\pi^-$ decays. By combining the information on mixing induced CP
violation in $B\to\pi^+\pi^-$, namely $S_{\pi\pi}$, with the precision
observable $\sin 2\beta$ obtained from the ``gold-plated''mode $B\to\psi K_S$,
we propose the determination of the unitarity triangle. We also discuss
alternative ways to analyze $S_{\pi\pi}$ which can be useful if new physics
affects $B_d$--$\bar B_d$ mixing. Predictions and uncertainties for $r$ and
$\phi$ in QCD factorization are examined in detail. It is pointed out that a
simultaneous expansion in $1/m_b$ and $1/N_C$ leads to interesting
simplifications. At first order infrared divergences are absent, while the most
important effects are retained. Independent experimental tests of the
factorization framework are briefly discussed.
| [
{
"created": "Sat, 8 Nov 2003 14:58:06 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Safir",
"A. Salim",
"",
"Munich U."
]
] | We analyze the extraction of weak phases from CP violation in $B\to\pi^+\pi^-$ decays. By combining the information on mixing induced CP violation in $B\to\pi^+\pi^-$, namely $S_{\pi\pi}$, with the precision observable $\sin 2\beta$ obtained from the ``gold-plated''mode $B\to\psi K_S$, we propose the determination of the unitarity triangle. We also discuss alternative ways to analyze $S_{\pi\pi}$ which can be useful if new physics affects $B_d$--$\bar B_d$ mixing. Predictions and uncertainties for $r$ and $\phi$ in QCD factorization are examined in detail. It is pointed out that a simultaneous expansion in $1/m_b$ and $1/N_C$ leads to interesting simplifications. At first order infrared divergences are absent, while the most important effects are retained. Independent experimental tests of the factorization framework are briefly discussed. |
2406.07447 | En-Hung Chao | En-Hung Chao and Norman Christ | Calculating the two-photon exchange contribution to
$K_L\rightarrow\mu^+\mu^-$ decay | 31 pages, 10 figures | null | null | null | hep-ph hep-lat | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present a theoretical framework within which both the real and imaginary
parts of the complex, two-photon exchange amplitude contributing to
$K_L\rightarrow\mu^+\mu^-$ decay can be calculated using lattice QCD. The real
part of this two-photon amplitude is of approximately the same size as that
coming from a second-order weak strangeness-changing neutral-current process.
Thus a test of the standard model prediction for this second-order weak process
depends on an accurate result of this two-photon amplitude. A limiting factor
of our proposed method comes from low-energy three-particle $\pi\pi\gamma$
states. The contribution from these states will be significantly distorted by
the finite volume of our calculation -- a distortion for which there is no
available correction. However, a simple estimate of the contribution of these
three-particle states suggests their contribution to be at most a few percent
allowing their neglect in a lattice calculation with a 10% target accuracy.
| [
{
"created": "Tue, 11 Jun 2024 16:53:33 GMT",
"version": "v1"
}
] | 2024-06-12 | [
[
"Chao",
"En-Hung",
""
],
[
"Christ",
"Norman",
""
]
] | We present a theoretical framework within which both the real and imaginary parts of the complex, two-photon exchange amplitude contributing to $K_L\rightarrow\mu^+\mu^-$ decay can be calculated using lattice QCD. The real part of this two-photon amplitude is of approximately the same size as that coming from a second-order weak strangeness-changing neutral-current process. Thus a test of the standard model prediction for this second-order weak process depends on an accurate result of this two-photon amplitude. A limiting factor of our proposed method comes from low-energy three-particle $\pi\pi\gamma$ states. The contribution from these states will be significantly distorted by the finite volume of our calculation -- a distortion for which there is no available correction. However, a simple estimate of the contribution of these three-particle states suggests their contribution to be at most a few percent allowing their neglect in a lattice calculation with a 10% target accuracy. |
0804.1099 | T. Goldman | H. Burkhardt (1), J. Lowe (1), G.J. Stephenson Jr. (1), T. Goldman
(2)and Bruce H.J. McKellar (3) ((1) U. of New Mexico, (2) LANL, (3) U. of
Melbourne) | Oscillations in the GSI electron capture experiment | 3pp., no figs | null | null | LA-UR-2070 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper, oscillations observed in the electron capture probability
were attributed to the mixing of neutrino mass eigenstates. This paper is shown
to be in error in two respects.
| [
{
"created": "Mon, 7 Apr 2008 18:04:58 GMT",
"version": "v1"
}
] | 2008-04-08 | [
[
"Burkhardt",
"H.",
""
],
[
"Lowe",
"J.",
""
],
[
"Stephenson",
"G. J.",
"Jr."
],
[
"Goldman",
"T.",
""
],
[
"McKellar",
"and Bruce H. J.",
""
]
] | In a recent paper, oscillations observed in the electron capture probability were attributed to the mixing of neutrino mass eigenstates. This paper is shown to be in error in two respects. |
1310.8042 | Jackson Clarke | Jackson D. Clarke, Robert Foot, Raymond R. Volkas | Phenomenology of a very light scalar (100 MeV $<m_h<$ 10 GeV) mixing
with the SM Higgs | 13 pages, 9 figures | JHEP 1402 (2014) 123 | 10.1007/JHEP02(2014)123 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the phenomenology of a very light scalar, $h$,
with mass 100 MeV $<m_h<$ 10 GeV, mixing with the SM Higgs. As a benchmark
model we take the real singlet scalar extension of the SM. We point out
apparently unresolved uncertainties in the branching ratios and lifetime of $h$
in a crucial region of parameter space for LHC phenomenology. Bounds from LEP,
meson decays and fixed target experiments are reviewed. We also examine
prospects at the LHC. For $m_h \lesssim m_B$ the dominant production mechanism
is via meson decay; our main result is the calculation of the differential
$p_T$ spectrum of $h$ scalars originating from B mesons and the subsequent
prediction of up to thousands of moderate (triggerable) $p_T$ displaced dimuons
possibly hiding in the existing dataset at ATLAS/CMS or at LHCb. We also
demonstrate that the subdominant $Vh$ production channel has the best
sensitivity for $m_h \gtrsim m_B$ and that future bounds in this region could
conceivably compete with those of LEP.
| [
{
"created": "Wed, 30 Oct 2013 06:50:29 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Mar 2014 23:13:26 GMT",
"version": "v2"
}
] | 2014-03-04 | [
[
"Clarke",
"Jackson D.",
""
],
[
"Foot",
"Robert",
""
],
[
"Volkas",
"Raymond R.",
""
]
] | In this paper we investigate the phenomenology of a very light scalar, $h$, with mass 100 MeV $<m_h<$ 10 GeV, mixing with the SM Higgs. As a benchmark model we take the real singlet scalar extension of the SM. We point out apparently unresolved uncertainties in the branching ratios and lifetime of $h$ in a crucial region of parameter space for LHC phenomenology. Bounds from LEP, meson decays and fixed target experiments are reviewed. We also examine prospects at the LHC. For $m_h \lesssim m_B$ the dominant production mechanism is via meson decay; our main result is the calculation of the differential $p_T$ spectrum of $h$ scalars originating from B mesons and the subsequent prediction of up to thousands of moderate (triggerable) $p_T$ displaced dimuons possibly hiding in the existing dataset at ATLAS/CMS or at LHCb. We also demonstrate that the subdominant $Vh$ production channel has the best sensitivity for $m_h \gtrsim m_B$ and that future bounds in this region could conceivably compete with those of LEP. |
1504.06421 | Marco Sampaio | Raul Costa, Ant\'onio P. Morais, Marco O. P. Sampaio, Rui Santos | Two-loop stability of singlet extensions of the SM with dark matter | Proceeding of the 2nd Toyama Workshop "Higgs as a Probe of New
Physics 2015", 11-15 February 2015. 5 pages, 2 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of the high energy stability of a minimal complex singlet
extension of the Standard Model with or without dark matter (CxSM). We start by
obtaining the beta functions of the couplings of the theory from the effective
potential and then perform the RGE evolution for the allowed parameter space of
the model at the electroweak scale. We obtain the scale up to which the model
survives and combine this information with all the LHC measurements as well as
bounds from dark matter detection experiments as well as the relic density best
measurement from Planck. We conclude that scenarios which solve both the dark
matter and stability problems must contain a dark particle heavier than 50 GeV
and a new visible state (mixing with the SM-like Higgs) heavier than 170 GeV.
| [
{
"created": "Fri, 24 Apr 2015 08:31:58 GMT",
"version": "v1"
}
] | 2015-04-27 | [
[
"Costa",
"Raul",
""
],
[
"Morais",
"António P.",
""
],
[
"Sampaio",
"Marco O. P.",
""
],
[
"Santos",
"Rui",
""
]
] | We present a study of the high energy stability of a minimal complex singlet extension of the Standard Model with or without dark matter (CxSM). We start by obtaining the beta functions of the couplings of the theory from the effective potential and then perform the RGE evolution for the allowed parameter space of the model at the electroweak scale. We obtain the scale up to which the model survives and combine this information with all the LHC measurements as well as bounds from dark matter detection experiments as well as the relic density best measurement from Planck. We conclude that scenarios which solve both the dark matter and stability problems must contain a dark particle heavier than 50 GeV and a new visible state (mixing with the SM-like Higgs) heavier than 170 GeV. |
1704.01364 | Aritra Bandyopadhyay | Aritra Bandyopadhyay and S. Mallik | Effect of magnetic field on dilepton production in a hot plasma | 14 pages, 5 figures; Accepted for publication in Phys. Rev. D | null | 10.1103/PhysRevD.95.074019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Noncentral collision of heavy ions can generate large magnetic field in its
neighbourhood. We describe a method to calculate the effect of this field on
the dilepton emission rate from the colliding region, when it reaches thermal
equilibrium. It is calculated in the real time method of thermal field theory.
We find that the rate is affected significantly only for lower momenta of
dileptons.
| [
{
"created": "Wed, 5 Apr 2017 11:02:45 GMT",
"version": "v1"
}
] | 2017-04-26 | [
[
"Bandyopadhyay",
"Aritra",
""
],
[
"Mallik",
"S.",
""
]
] | Noncentral collision of heavy ions can generate large magnetic field in its neighbourhood. We describe a method to calculate the effect of this field on the dilepton emission rate from the colliding region, when it reaches thermal equilibrium. It is calculated in the real time method of thermal field theory. We find that the rate is affected significantly only for lower momenta of dileptons. |
hep-ph/0403151 | Valery Yudichev | D. Blaschke, D. Ebert, K. G. Klimenko, M. K. Volkov and V. L. Yudichev | Abnormal number of Nambu-Goldstone bosons in the color-asymmetric 2SC
phase of an NJL-type model | 13 pages, 4 figures, revtex4 | Phys.Rev. D70 (2004) 014006 | 10.1103/PhysRevD.70.014006 | null | hep-ph | null | We consider an extended Nambu--Jona-Lasinio model including both (q \bar q)-
and (qq)-interactions with two light-quark flavors in the presence of a single
(quark density) chemical potential. In the color superconducting phase of the
quark matter the color SU(3) symmetry is spontaneously broken down to SU(2). If
the usual counting of Goldstone bosons would apply, five Nambu-Goldstone (NG)
bosons corresponding to the five broken color generators should appear in the
mass spectrum. Unlike that expectation, we find only three gapless diquark
excitations of quark matter. One of them is an SU(2)-singlet, the remaining two
form an SU(2)-(anti)doublet and have a quadratic dispersion law in the small
momentum limit. These results are in agreement with the Nielsen-Chadha theorem,
according to which NG-bosons in Lorentz-noninvariant systems, having a
quadratic dispersion law, must be counted differently. The origin of the
abnormal number of NG-bosons is shown to be related to a nonvanishing
expectation value of the color charge operator Q_8 reflecting the lack of color
neutrality of the ground state. Finally, by requiring color neutrality, two
massive diquarks are argued to become massless, resulting in a normal number of
five NG-bosons with usual linear dispersion laws.
| [
{
"created": "Sun, 14 Mar 2004 11:51:08 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Blaschke",
"D.",
""
],
[
"Ebert",
"D.",
""
],
[
"Klimenko",
"K. G.",
""
],
[
"Volkov",
"M. K.",
""
],
[
"Yudichev",
"V. L.",
""
]
] | We consider an extended Nambu--Jona-Lasinio model including both (q \bar q)- and (qq)-interactions with two light-quark flavors in the presence of a single (quark density) chemical potential. In the color superconducting phase of the quark matter the color SU(3) symmetry is spontaneously broken down to SU(2). If the usual counting of Goldstone bosons would apply, five Nambu-Goldstone (NG) bosons corresponding to the five broken color generators should appear in the mass spectrum. Unlike that expectation, we find only three gapless diquark excitations of quark matter. One of them is an SU(2)-singlet, the remaining two form an SU(2)-(anti)doublet and have a quadratic dispersion law in the small momentum limit. These results are in agreement with the Nielsen-Chadha theorem, according to which NG-bosons in Lorentz-noninvariant systems, having a quadratic dispersion law, must be counted differently. The origin of the abnormal number of NG-bosons is shown to be related to a nonvanishing expectation value of the color charge operator Q_8 reflecting the lack of color neutrality of the ground state. Finally, by requiring color neutrality, two massive diquarks are argued to become massless, resulting in a normal number of five NG-bosons with usual linear dispersion laws. |
1509.08735 | Fabio Dahia | F. Dahia and A. S. Lemos | Is the proton radius puzzle evidence of extra dimensions? | Updated with new data | null | 10.1140/epjc/s10052-016-4266-7 | null | hep-ph gr-qc hep-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The proton charge radius inferred from muonic hydrogen spectroscopy is not
compatible with the previous value given by CODATA-2010, which, on its turn,
essentially relies on measurements of the electron-proton interaction. The
proton's new size was extracted from the 2S-2P Lamb shift in the muonic
hydrogen, which showed an energy excess of 0.3 meV in comparison to the
theoretical prediction, evaluated with the CODATA radius. Higher-dimensional
gravity is a candidate to explain this discrepancy, since the muon-proton
gravitational interaction is stronger than the electron-proton interaction and,
in the context of braneworld models, the gravitational potential can be hugely
amplified in short distances when compared to the Newtonian potential.
Motivated by these ideas, we study a muonic hydrogen confined in a thick brane.
We show that the muon-proton gravitational interaction modified by extra
dimensions can provide the additional separation of 0.3 meV between 2S and 2P
states. In this scenario, the gravitational energy depends on the
higher-dimensional Planck mass and indirectly on the brane thickness. Studying
the behavior of the gravitational energy with respect to the brane thickness in
a realistic range, we find constraints for the fundamental Planck mass that
solve the proton radius puzzle and are consistent with previous experimental
bounds.
| [
{
"created": "Tue, 29 Sep 2015 13:11:52 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2016 18:41:01 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Dahia",
"F.",
""
],
[
"Lemos",
"A. S.",
""
]
] | The proton charge radius inferred from muonic hydrogen spectroscopy is not compatible with the previous value given by CODATA-2010, which, on its turn, essentially relies on measurements of the electron-proton interaction. The proton's new size was extracted from the 2S-2P Lamb shift in the muonic hydrogen, which showed an energy excess of 0.3 meV in comparison to the theoretical prediction, evaluated with the CODATA radius. Higher-dimensional gravity is a candidate to explain this discrepancy, since the muon-proton gravitational interaction is stronger than the electron-proton interaction and, in the context of braneworld models, the gravitational potential can be hugely amplified in short distances when compared to the Newtonian potential. Motivated by these ideas, we study a muonic hydrogen confined in a thick brane. We show that the muon-proton gravitational interaction modified by extra dimensions can provide the additional separation of 0.3 meV between 2S and 2P states. In this scenario, the gravitational energy depends on the higher-dimensional Planck mass and indirectly on the brane thickness. Studying the behavior of the gravitational energy with respect to the brane thickness in a realistic range, we find constraints for the fundamental Planck mass that solve the proton radius puzzle and are consistent with previous experimental bounds. |
2004.11450 | Antonio Enrique C\'arcamo Hern\'andez | A. E. C\'arcamo Hern\'andez, D. T. Huong, Sergey Kovalenko, Antonio P.
Morais, Roman Pasechnik, Ivan Schmidt | How low-scale Trinification sheds light in the flavour hierarchies,
neutrino puzzle, dark matter and leptogenesis | Version published in PRD | Phys. Rev. D 102, 095003 (2020) | 10.1103/PhysRevD.102.095003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a low-scale renormalizable trinification theory that successfully
explains the flavor hierarchies and neutrino puzzle in the Standard Model (SM),
as well as provides a dark matter candidate and also contains the necessary
means for efficient leptogenesis. The proposed theory is based on the
trinification $\SU{3}{C}\times \SU{3}{L}\times \SU{3}{R}$ gauge symmetry, which
is supplemented with an additional flavor symmetry $\U{X}\times Z_{2}^{(1)}
\times Z_{2}^{(2)}$. In the proposed model the top quark and the exotic
fermions acquire tree-level masses, whereas the lighter SM charged fermions
gain masses radiatively at one-loop level. In addition, the light active
neutrino masses arise from a combination of radiative and type-I seesaw
mechanisms, with the Dirac neutrino mass matrix generated at one-loop level.
| [
{
"created": "Thu, 23 Apr 2020 20:43:29 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2020 14:02:26 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Dec 2020 13:51:24 GMT",
"version": "v3"
}
] | 2021-01-01 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Huong",
"D. T.",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Morais",
"Antonio P.",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Schmidt",
"Ivan",
""
]
] | We propose a low-scale renormalizable trinification theory that successfully explains the flavor hierarchies and neutrino puzzle in the Standard Model (SM), as well as provides a dark matter candidate and also contains the necessary means for efficient leptogenesis. The proposed theory is based on the trinification $\SU{3}{C}\times \SU{3}{L}\times \SU{3}{R}$ gauge symmetry, which is supplemented with an additional flavor symmetry $\U{X}\times Z_{2}^{(1)} \times Z_{2}^{(2)}$. In the proposed model the top quark and the exotic fermions acquire tree-level masses, whereas the lighter SM charged fermions gain masses radiatively at one-loop level. In addition, the light active neutrino masses arise from a combination of radiative and type-I seesaw mechanisms, with the Dirac neutrino mass matrix generated at one-loop level. |
1910.07522 | Vitaly Magerya | Vitaly Magerya, Andrey Pikelner | Cutting massless four-loop propagators | 57 pages, 15 tables, 1 figure, auxiliary files | null | 10.1007/JHEP12(2019)026 | DESY 19-133 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Among the unitarity cuts of 4-loop massless propagators two kinds are
currently fully known: the 2-particle cuts with 3 loops corresponding to
form-factors, and the 5-particle phase-space integrals. In this paper we
calculate master integrals for the remaining ones: 3-particle cuts with 2
loops, and 4-particle cuts with 1 loop. The 4-particle cuts are calculated by
solving dimensional recurrence relations. The 3-particle cuts are integrated
directly using 1->3 amplitudes with 2 loops, which we also re-derive here up to
transcendentality weight 7. The results are verified both numerically, and by
showing consistency with previously known integrals using Cutkosky rules. We
provide the analytic results in the space-time dimension 4-2{\epsilon} as
series in {\epsilon} with coefficients being multiple zeta values up to weight
12. In the ancillary files we also provide dimensional recurrence matrices and
SummerTime files suitable for numerical evaluation of the series in arbitrary
dimensions with any precision.
| [
{
"created": "Wed, 16 Oct 2019 13:31:40 GMT",
"version": "v1"
}
] | 2020-01-29 | [
[
"Magerya",
"Vitaly",
""
],
[
"Pikelner",
"Andrey",
""
]
] | Among the unitarity cuts of 4-loop massless propagators two kinds are currently fully known: the 2-particle cuts with 3 loops corresponding to form-factors, and the 5-particle phase-space integrals. In this paper we calculate master integrals for the remaining ones: 3-particle cuts with 2 loops, and 4-particle cuts with 1 loop. The 4-particle cuts are calculated by solving dimensional recurrence relations. The 3-particle cuts are integrated directly using 1->3 amplitudes with 2 loops, which we also re-derive here up to transcendentality weight 7. The results are verified both numerically, and by showing consistency with previously known integrals using Cutkosky rules. We provide the analytic results in the space-time dimension 4-2{\epsilon} as series in {\epsilon} with coefficients being multiple zeta values up to weight 12. In the ancillary files we also provide dimensional recurrence matrices and SummerTime files suitable for numerical evaluation of the series in arbitrary dimensions with any precision. |
1808.02188 | Qin Chang | Qin Chang, Jie Zhu, Na Wang and Ru-Min Wang | Probing the effects of new physics in $\bar{B}^* \to P \ell
\bar{\nu}_\ell$ decays | 24 pages, 4 figures | Advances in High Energy Physics 2018 (2018) 7231354 | 10.1155/2018/7231354/ | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The significant divergence between the SM predictions and experimental
measurements for the ratios, $R_{D^{(*)}}\equiv \mathcal{B}(\bar{B}\to
D^{(*)}\tau^- \bar{\nu}_\tau)/ \mathcal{B}(\bar{B}\to D^{(*)} \ell^{\prime-}
\bar{\nu}_{\ell^{\prime}})$ with $(\ell^{\prime}=e\,,\mu)$, implies possible
hint of new physics in the flavour sector. In this paper, motivated by the
"$R_{D^{(*)}}$ puzzle" and abundant $B^*$ data samples at high-luminosity
heavy-flavor experiments in the future, we try to probe possible effects of new
physics in the semileptonic $\bar{B}^*_{u,d,s} \to P \ell^- \bar{\nu}_\ell$
$(P=D\,,D_s\,,\pi\,,K)$ decays induced by $b \to (u,\,c)\ell^-
\bar{\nu}_{\ell}$ transitions in the model-independent vector and scalar
scenarios. Using the spaces of NP parameters obtained by fitting to the data of
$R_{D}$ and $R_{D^{*}}$, the NP effects on the observables including branching
fraction, ratio $R_P^{\ast}$, lepton spin asymmetry and lepton forward-backward
asymmetry are studied in detail. We find that the vector type couplings have
large effects on the branching fraction and ratio $R_P^{\ast}$. Meanwhile, the
scalar type couplings provide significant contributions to all of the
observables. The future measurements of these observables in the $\bar{B}^* \to
P \ell^- \bar{\nu}_\ell$ decays at the LHCb and Belle-II could provide a way to
crosscheck the various NP solutions to the "$R_{D^{(*)}}$ puzzle".
| [
{
"created": "Tue, 7 Aug 2018 03:00:13 GMT",
"version": "v1"
}
] | 2018-10-02 | [
[
"Chang",
"Qin",
""
],
[
"Zhu",
"Jie",
""
],
[
"Wang",
"Na",
""
],
[
"Wang",
"Ru-Min",
""
]
] | The significant divergence between the SM predictions and experimental measurements for the ratios, $R_{D^{(*)}}\equiv \mathcal{B}(\bar{B}\to D^{(*)}\tau^- \bar{\nu}_\tau)/ \mathcal{B}(\bar{B}\to D^{(*)} \ell^{\prime-} \bar{\nu}_{\ell^{\prime}})$ with $(\ell^{\prime}=e\,,\mu)$, implies possible hint of new physics in the flavour sector. In this paper, motivated by the "$R_{D^{(*)}}$ puzzle" and abundant $B^*$ data samples at high-luminosity heavy-flavor experiments in the future, we try to probe possible effects of new physics in the semileptonic $\bar{B}^*_{u,d,s} \to P \ell^- \bar{\nu}_\ell$ $(P=D\,,D_s\,,\pi\,,K)$ decays induced by $b \to (u,\,c)\ell^- \bar{\nu}_{\ell}$ transitions in the model-independent vector and scalar scenarios. Using the spaces of NP parameters obtained by fitting to the data of $R_{D}$ and $R_{D^{*}}$, the NP effects on the observables including branching fraction, ratio $R_P^{\ast}$, lepton spin asymmetry and lepton forward-backward asymmetry are studied in detail. We find that the vector type couplings have large effects on the branching fraction and ratio $R_P^{\ast}$. Meanwhile, the scalar type couplings provide significant contributions to all of the observables. The future measurements of these observables in the $\bar{B}^* \to P \ell^- \bar{\nu}_\ell$ decays at the LHCb and Belle-II could provide a way to crosscheck the various NP solutions to the "$R_{D^{(*)}}$ puzzle". |
hep-ph/0611274 | Jeff Forshaw | Jeffrey R. Forshaw | Diffractive Higgs production | 8 pages. Talk presented at "Diffraction 2006" | PoSDIFF2006:055,2006 | null | MAN/HEP/2006/33 | hep-ph | null | Instrumenting the LHC to measure the outgoing protons in the process pp ->
p+X+p opens up new possibilities for physics studies in the Standard Model and
beyond. In this talk I first present an overview of the underlying QCD
calculation and its uncertainties. I then move on to present a variety of new
physics scenarios which one would want to explore via this unique channel.
There is a short discussion of the recent CDF data which may provide evidence
for the existence of central exclusive jet production at the Tevatron.
| [
{
"created": "Tue, 21 Nov 2006 10:55:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Forshaw",
"Jeffrey R.",
""
]
] | Instrumenting the LHC to measure the outgoing protons in the process pp -> p+X+p opens up new possibilities for physics studies in the Standard Model and beyond. In this talk I first present an overview of the underlying QCD calculation and its uncertainties. I then move on to present a variety of new physics scenarios which one would want to explore via this unique channel. There is a short discussion of the recent CDF data which may provide evidence for the existence of central exclusive jet production at the Tevatron. |
1301.0197 | Zhenjun Xiao | Wen-Fei Wang, Ying-Ying Fan, Min Liu, and Zhen-Jun Xiao | Semileptonic decays $B/B_s \to (\eta,\etar,
G)(l^+l^-,l\bar{\nu},\nu\bar{\nu})$ in the perturbative QCD approach beyond
the leading order | 8 pages, 1 figure. Published in Phys.Rev. D87, 097501 (2013) | null | 10.1103/PhysRevD.87.097501 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we make a systematic study of the semileptonic decays $B/B_s
\to (\eta,\etar, G)(l^+l^-,l\bar{\nu},\nu\bar{\nu})$ by employing the
perturbative QCD (pQCD) factorization approach. The next-to-leading-order (NLO)
contributions to the relevant form factors are included, and the ordinary
$\eta$-$\etar$ mixing scheme and the $\eta$-$\etar$-$G$ mixing scheme are
considered separately, where $G$ denotes a pseudoscalar glueball. The numerical
results and the phenomenological analysis indicate that (a) the NLO
contributions to the relevant form factors provide 25% enhancement to the
leading-order pQCD predictions for the branching ratios $Br(B^-\to \eta^{(')}
l^-\bar{\nu}_l)$, leading to a good agreement between the predictions and the
data; (b) for all considered decays, the pQCD results are basically consistent
with those from other different theoretical models; (c) the pQCD predictions in
the two considered mixing schemes agree well with each other within theoretical
errors. The outcomes presented here can be tested by LHCb and forthcoming
Super-$B$ experiments.
| [
{
"created": "Wed, 2 Jan 2013 10:00:10 GMT",
"version": "v1"
},
{
"created": "Sat, 11 May 2013 12:21:34 GMT",
"version": "v2"
}
] | 2013-05-14 | [
[
"Wang",
"Wen-Fei",
""
],
[
"Fan",
"Ying-Ying",
""
],
[
"Liu",
"Min",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] | In this paper we make a systematic study of the semileptonic decays $B/B_s \to (\eta,\etar, G)(l^+l^-,l\bar{\nu},\nu\bar{\nu})$ by employing the perturbative QCD (pQCD) factorization approach. The next-to-leading-order (NLO) contributions to the relevant form factors are included, and the ordinary $\eta$-$\etar$ mixing scheme and the $\eta$-$\etar$-$G$ mixing scheme are considered separately, where $G$ denotes a pseudoscalar glueball. The numerical results and the phenomenological analysis indicate that (a) the NLO contributions to the relevant form factors provide 25% enhancement to the leading-order pQCD predictions for the branching ratios $Br(B^-\to \eta^{(')} l^-\bar{\nu}_l)$, leading to a good agreement between the predictions and the data; (b) for all considered decays, the pQCD results are basically consistent with those from other different theoretical models; (c) the pQCD predictions in the two considered mixing schemes agree well with each other within theoretical errors. The outcomes presented here can be tested by LHCb and forthcoming Super-$B$ experiments. |
hep-ph/0101221 | Graham Shaw | A Donnachie, J Gravelis and G Shaw (University of Manchester) | A Unified Model of Exclusive $\rho^0$, $\phi$ and $\jpsi$
Electroproduction | 30 pages, 35 figures | Phys.Rev. D63 (2001) 114013 | 10.1103/PhysRevD.63.114013 | M/C-TH-01/01 | hep-ph | null | A two-component model is developed for diffractive electroproduction of
$\rho^0$, $\phi$ and $\jpsi$, based on non-perturbative and perturbative
two-gluon exchange. This provides a common kinematical structure for
non-perturbative and perturbative effects, and allows the role of the
vector-meson vertex functions to be explored independently of the production
dynamics. A good global description of the vector-meson data is obtained.
| [
{
"created": "Fri, 19 Jan 2001 16:26:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Donnachie",
"A",
"",
"University of Manchester"
],
[
"Gravelis",
"J",
"",
"University of Manchester"
],
[
"Shaw",
"G",
"",
"University of Manchester"
]
] | A two-component model is developed for diffractive electroproduction of $\rho^0$, $\phi$ and $\jpsi$, based on non-perturbative and perturbative two-gluon exchange. This provides a common kinematical structure for non-perturbative and perturbative effects, and allows the role of the vector-meson vertex functions to be explored independently of the production dynamics. A good global description of the vector-meson data is obtained. |
hep-ph/0309009 | Hannes Jung | M. Hansson, H. Jung (Lund University, Sweden) | Status of CCFM - unintegrated gluon densities | to be published in DIS03 proceedings | null | null | null | hep-ph | null | New fits of the unintegrated gluon density obtained from CCFM evolution to
HERA $F_2(x,Q^2)$ data are presented. Also predictions of the unintegrated
gluon density of the real photon are presented.
| [
{
"created": "Mon, 1 Sep 2003 11:28:53 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2003 15:00:37 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Hansson",
"M.",
"",
"Lund University, Sweden"
],
[
"Jung",
"H.",
"",
"Lund University, Sweden"
]
] | New fits of the unintegrated gluon density obtained from CCFM evolution to HERA $F_2(x,Q^2)$ data are presented. Also predictions of the unintegrated gluon density of the real photon are presented. |
1902.05556 | Spencer Chang | Spencer Chang, Markus A. Luty | The Higgs Trilinear Coupling and the Scale of New Physics | 28 pages, 3 figures, added discussion. Final published version in
JHEP | J. High Energ. Phys. 2020, 140 (2020) | 10.1007/JHEP03(2020)140 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider modifications of the Higgs potential due to new physics at high
energy scales. These upset delicate cancellations predicted by the Standard
Model for processes involving Higgs bosons and longitudinal gauge bosons, and
lead to a breakdown of the theory at high energies. We focus on modifications
of the Higgs trilinear coupling and use the violation of tree-level unitarity
as an estimate of the scale where the theory breaks down. We obtain a
completely model-independent bound of ~ 13 TeV for an order-1 modification of
the trilinear. We argue that this bound can be saturated only in fine-tuned
models, and the scale of new physics is likely to be much lower. The most
stringent bounds are obtained from amplitudes involving multiparticle states
that are not conventional scattering states. Our results show that a future
determination of the Higgs cubic coupling can point to a well-defined scale of
new physics that can be targeted and explored at future colliders.
| [
{
"created": "Thu, 14 Feb 2019 19:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 2020 07:00:40 GMT",
"version": "v2"
}
] | 2020-04-01 | [
[
"Chang",
"Spencer",
""
],
[
"Luty",
"Markus A.",
""
]
] | We consider modifications of the Higgs potential due to new physics at high energy scales. These upset delicate cancellations predicted by the Standard Model for processes involving Higgs bosons and longitudinal gauge bosons, and lead to a breakdown of the theory at high energies. We focus on modifications of the Higgs trilinear coupling and use the violation of tree-level unitarity as an estimate of the scale where the theory breaks down. We obtain a completely model-independent bound of ~ 13 TeV for an order-1 modification of the trilinear. We argue that this bound can be saturated only in fine-tuned models, and the scale of new physics is likely to be much lower. The most stringent bounds are obtained from amplitudes involving multiparticle states that are not conventional scattering states. Our results show that a future determination of the Higgs cubic coupling can point to a well-defined scale of new physics that can be targeted and explored at future colliders. |
2303.12781 | Giancarlo Ferrera | Stefano Camarda, Leandro Cieri and Giancarlo Ferrera | Drell-Yan lepton-pair production: $q_T$ resummation at approximate
N$^4$LL+N$^4$LO accuracy | 20 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Drell-Yan lepton pairs produced in hadronic collisions. We
present high-accuracy QCD predictions for the transverse-momentum ($q_T$)
distribution and fiducial cross sections in the small $q_T$ region. We resum to
all perturbative orders the logarithmically enhanced contributions up to the
next-to-next-to-next-to-next-to-leading logarithmic (N$^4$LL) accuracy and we
include the hard-virtual coefficient at the next-to-next-to-next-to-leading
order (N$^3$LO) (i.e. $\mathcal{O}(\alpha_S^3)$) with an approximation of the
N$^4$LO coefficients. The massive axial-vector and vector contributions up to
three loops have also been consistently included. The resummed partonic cross
section is convoluted with approximate N$^3$LO parton distribution functions.
We show numerical results at LHC energies of resummed $q_T$ distributions for
$Z/\gamma^*, W^\pm$ production and decay, including the $W^\pm$ and
$Z/\gamma^*$ ratio, estimating the corresponding uncertainties from missing
higher orders corrections and from incomplete or missing perturbative
information coefficients at N$^4$LL and N$^4$LO. Our resummed calculation has
been encoded in the public numerical program DYTurbo.
| [
{
"created": "Wed, 22 Mar 2023 17:51:32 GMT",
"version": "v1"
}
] | 2023-03-23 | [
[
"Camarda",
"Stefano",
""
],
[
"Cieri",
"Leandro",
""
],
[
"Ferrera",
"Giancarlo",
""
]
] | We consider Drell-Yan lepton pairs produced in hadronic collisions. We present high-accuracy QCD predictions for the transverse-momentum ($q_T$) distribution and fiducial cross sections in the small $q_T$ region. We resum to all perturbative orders the logarithmically enhanced contributions up to the next-to-next-to-next-to-next-to-leading logarithmic (N$^4$LL) accuracy and we include the hard-virtual coefficient at the next-to-next-to-next-to-leading order (N$^3$LO) (i.e. $\mathcal{O}(\alpha_S^3)$) with an approximation of the N$^4$LO coefficients. The massive axial-vector and vector contributions up to three loops have also been consistently included. The resummed partonic cross section is convoluted with approximate N$^3$LO parton distribution functions. We show numerical results at LHC energies of resummed $q_T$ distributions for $Z/\gamma^*, W^\pm$ production and decay, including the $W^\pm$ and $Z/\gamma^*$ ratio, estimating the corresponding uncertainties from missing higher orders corrections and from incomplete or missing perturbative information coefficients at N$^4$LL and N$^4$LO. Our resummed calculation has been encoded in the public numerical program DYTurbo. |
1305.7340 | Matthias Steinhauser | Jonathan Grigo, Jens Hoff, Kirill Melnikov, Matthias Steinhauser | On the Higgs boson pair production at the LHC | 19 pages, 10 figures | null | 10.1016/j.nuclphysb.2013.06.024 | SFB/CPP-13-29, TTP13-13, LPN13-030 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the production cross section of a pair of Standard Model Higgs
bosons at the LHC at next-to-leading order in QCD, including corrections in
inverse powers of the top quark mass. We calculate these power corrections
through ${\cal O}(1/M_t^8)$ and study their relevance for phenomenology of the
double Higgs production. We find that power corrections are significant, even
for moderate values of partonic center-of-mass energies, and that convergence
of the $1/M_t$ expansion can be dramatically improved by factorizing the
leading order cross section with full $M_t$-dependence.
| [
{
"created": "Fri, 31 May 2013 09:38:11 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Grigo",
"Jonathan",
""
],
[
"Hoff",
"Jens",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | We compute the production cross section of a pair of Standard Model Higgs bosons at the LHC at next-to-leading order in QCD, including corrections in inverse powers of the top quark mass. We calculate these power corrections through ${\cal O}(1/M_t^8)$ and study their relevance for phenomenology of the double Higgs production. We find that power corrections are significant, even for moderate values of partonic center-of-mass energies, and that convergence of the $1/M_t$ expansion can be dramatically improved by factorizing the leading order cross section with full $M_t$-dependence. |
hep-ph/0212030 | Volodymyr Magas | R. Fiore, A. Flachi, L.L. Jenkovszky, A. Lengyel, V.K. Magas | Generalized distribution amplitudes: new tools to study hadrons'
structure and interactions | 12 pages, 2 figures, style file included | Proceedings of the NATO Advanced Research Workshop "Diffraction
2002", Alushta, Crimea, Ukraine, August 31 - September 6, 2002, edited by R.
Fiore, A. Papa, L.L. Jenkovszky, M.I. Kotsky, V.K. Magas (Kluwer Academic
2003) NATO ASI series II: Mathematics, physics and chemistry. 101 pp. 123-134 | null | null | hep-ph | null | A non-perturbative approach to Generalized Parton Distributions, and to
Deeply Virtual Compton Scattering in particular, based on off mass shell
extension of dual amplitudes with Mandelstam analyticity (DAMA) is developed
with the spin and helicity structure as well as the threshold behavior
accounted for. The model is tested against the data on deep inelastic
electron-proton scattering from JLab.
| [
{
"created": "Mon, 2 Dec 2002 21:21:11 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Oct 2003 14:50:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fiore",
"R.",
""
],
[
"Flachi",
"A.",
""
],
[
"Jenkovszky",
"L. L.",
""
],
[
"Lengyel",
"A.",
""
],
[
"Magas",
"V. K.",
""
]
] | A non-perturbative approach to Generalized Parton Distributions, and to Deeply Virtual Compton Scattering in particular, based on off mass shell extension of dual amplitudes with Mandelstam analyticity (DAMA) is developed with the spin and helicity structure as well as the threshold behavior accounted for. The model is tested against the data on deep inelastic electron-proton scattering from JLab. |
1601.03736 | David Vanegas Forero | David V. Forero, Patrick Huber | Hints for leptonic CP violation or New Physics? | 4 pages, 2 figures | Phys. Rev. Lett. 117, 031801 (2016) | 10.1103/PhysRevLett.117.031801 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the major open questions in the neutrino sector is the issue of
leptonic CP violation. Current global oscillation data shows a mild preference
for a large, potentially maximal value for the Dirac CP phase in the neutrino
mixing matrix. In this letter, we point out that New Physics in the form of
neutral-current like non-standard interactions with real couplings would likely
yield a similar conclusion even if CP in the neutrino sector were conserved.
Therefore, the claim for a discovery of leptonic CP violation will require a
robust ability to test New Physics scenarios.
| [
{
"created": "Thu, 14 Jan 2016 21:00:01 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Forero",
"David V.",
""
],
[
"Huber",
"Patrick",
""
]
] | One of the major open questions in the neutrino sector is the issue of leptonic CP violation. Current global oscillation data shows a mild preference for a large, potentially maximal value for the Dirac CP phase in the neutrino mixing matrix. In this letter, we point out that New Physics in the form of neutral-current like non-standard interactions with real couplings would likely yield a similar conclusion even if CP in the neutrino sector were conserved. Therefore, the claim for a discovery of leptonic CP violation will require a robust ability to test New Physics scenarios. |
1501.03088 | Bruno Os\'orio Rodrigues | B. Os\'orio Rodrigues, M. E. Bracco, M. Chiapparini, A. Cerqueira Jr | A QCD sum rules calculation of the $J/\psi D_s^* D_s$ strong coupling
constant | 17 pages, 4 figures | null | 10.1140/epja/i2015-15028-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we calculate the form factors and the coupling constant of the
strange-charmed vertex $J/\psi D_s^* D_s$ in the framework of the QCD sum rules
by studying their three-point correlation functions. All the possible off-shell
cases are considered, $D_s$, $D_s^*$ and $J/\psi$, resulting in three different
form factors. These form factors are extrapolated to the pole of their
respective off-shell mesons, giving the same coupling constant for the process.
Our final result for the $J/\psi D_s^* D_s$ coupling constant is $g_{J/\psi
D^*_s D_s} = 4.30^{+0.42}_{-0.37}\text{GeV}^{-1}$.
| [
{
"created": "Tue, 13 Jan 2015 17:54:15 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Rodrigues",
"B. Osório",
""
],
[
"Bracco",
"M. E.",
""
],
[
"Chiapparini",
"M.",
""
],
[
"Cerqueira",
"A.",
"Jr"
]
] | In this work, we calculate the form factors and the coupling constant of the strange-charmed vertex $J/\psi D_s^* D_s$ in the framework of the QCD sum rules by studying their three-point correlation functions. All the possible off-shell cases are considered, $D_s$, $D_s^*$ and $J/\psi$, resulting in three different form factors. These form factors are extrapolated to the pole of their respective off-shell mesons, giving the same coupling constant for the process. Our final result for the $J/\psi D_s^* D_s$ coupling constant is $g_{J/\psi D^*_s D_s} = 4.30^{+0.42}_{-0.37}\text{GeV}^{-1}$. |
hep-ph/0604238 | Chao-Hsi Chang | Chao-Hsi Chang, Jian-Xiong Wang and Xing-Gang Wu | An Upgraded Version of the Generator BCVEGPY2.0 for Hadronic Production
of $B_c$ Meson and Its Excited States | 9 pages, 1 figure. Add explanation and correct the typos etc | Comput.Phys.Commun.175:624-627,2006 | 10.1016/j.cpc.2006.07.014 | null | hep-ph hep-ex | null | An upgraded version of the package [BCVEGPY2.0: Chao-Hsi Chang, Jian-Xiong
Wang and Xing-Gang Wu, Comput. Phys. Commun. {\bf 174} (2006) 241-251] is
presented, which works under LINUX system and is named as BCVEGPY2.1. Using
this version with a GNU C compiler, users may simulate the $B_c$-events in
various experimental environments very conveniently. It has been rearranged for
better modularity and code reusability (less dependency among various modules)
than BCVEGPY2.0 has. Furthermore, in the upgraded version a special and
convenient executable-file {\bf run} as default is available according to one's
wish, i.e., the file is obtained in the way that the GNU command {\bf make}
compiles the codes requested by precise purpose with the help of a master {\bf
makefile} in the main code directory. Finally, this paper may also be
considered as an erratum of the original BCVEGPY2.0, i.e., here the errors
(typo mainly) in BCVEGPY2.0 have been corrected.
| [
{
"created": "Thu, 27 Apr 2006 09:57:10 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2006 11:18:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chang",
"Chao-Hsi",
""
],
[
"Wang",
"Jian-Xiong",
""
],
[
"Wu",
"Xing-Gang",
""
]
] | An upgraded version of the package [BCVEGPY2.0: Chao-Hsi Chang, Jian-Xiong Wang and Xing-Gang Wu, Comput. Phys. Commun. {\bf 174} (2006) 241-251] is presented, which works under LINUX system and is named as BCVEGPY2.1. Using this version with a GNU C compiler, users may simulate the $B_c$-events in various experimental environments very conveniently. It has been rearranged for better modularity and code reusability (less dependency among various modules) than BCVEGPY2.0 has. Furthermore, in the upgraded version a special and convenient executable-file {\bf run} as default is available according to one's wish, i.e., the file is obtained in the way that the GNU command {\bf make} compiles the codes requested by precise purpose with the help of a master {\bf makefile} in the main code directory. Finally, this paper may also be considered as an erratum of the original BCVEGPY2.0, i.e., here the errors (typo mainly) in BCVEGPY2.0 have been corrected. |
1903.05664 | Khushboo Dixit | Khushboo Dixit, Javid Naikoo, Banibrata Mukhopadhyay, Subhashish
Banerjee | Quantum correlations in neutrino oscillations in curved spacetime | 7 pages, 5 figures, Matches the published version | Phys. Rev. D 100, 055021 (2019) | 10.1103/PhysRevD.100.055021 | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravity induced neutrino-antineutrino oscillations are studied in the context
of one and two flavor scenarios. This allows one to investigate the
particle-antiparticle correlations in two and four level systems, respectively.
Flavor entropy is used to probe the entanglement in the system. The well known
witnesses of non-classicality such as Mermin and Svetlichly inequalities are
investigated. Since the extent of neutrino-antineutrino oscillation is governed
by the strength of the gravitational field, the behavior of non-classicality
shows interesting features as one varies the strength of the gravitational
field. Specifically, the suppression of the entanglement with the increase of
the gravitational field is observed which is witnessed in the form of decrease
in the flavor entropy of the system. The features of the Mermin and the
Svetlichny inequalities allow one to make statements about the degeneracy of
neutrino mass eigenstates.
| [
{
"created": "Wed, 13 Mar 2019 18:27:46 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2019 10:32:39 GMT",
"version": "v2"
}
] | 2019-09-20 | [
[
"Dixit",
"Khushboo",
""
],
[
"Naikoo",
"Javid",
""
],
[
"Mukhopadhyay",
"Banibrata",
""
],
[
"Banerjee",
"Subhashish",
""
]
] | Gravity induced neutrino-antineutrino oscillations are studied in the context of one and two flavor scenarios. This allows one to investigate the particle-antiparticle correlations in two and four level systems, respectively. Flavor entropy is used to probe the entanglement in the system. The well known witnesses of non-classicality such as Mermin and Svetlichly inequalities are investigated. Since the extent of neutrino-antineutrino oscillation is governed by the strength of the gravitational field, the behavior of non-classicality shows interesting features as one varies the strength of the gravitational field. Specifically, the suppression of the entanglement with the increase of the gravitational field is observed which is witnessed in the form of decrease in the flavor entropy of the system. The features of the Mermin and the Svetlichny inequalities allow one to make statements about the degeneracy of neutrino mass eigenstates. |
hep-ph/9511244 | null | A. Dobado and J. Morales | A note on the GG-->PI 0 PI 0 reaction in the 1/N expansion of ChPT | 16 pages, LaTeX | Phys.Lett. B365 (1996) 264-274 | 10.1016/0370-2693(95)01240-0 | null | hep-ph | null | In this work we present the results of a complete calculation of the $\gamma
\gamma\rightarrow \pi^0\pi^0$ amplitude to leading order in the large $N$
approximation ($N$ being the number of Goldstone bosons) up to order
$m^2_{\pi}/F^2$. The amplitude turns to be proportional to that of
$\pi^+\pi^-\rightarrow \pi^0\pi^0$. In spite of the fact that this
factorization property cannot hold in general (as it was recently pointed out
by Morgan and Penington), it appears here since in the large $N$ limit only the
$I=J=0$ channel contributes to the $\gamma \gamma\rightarrow \pi^0\pi^0$
reaction. Moreover it seems to be a reasonable approximation in
this case since it is possible to reproduce, as a prediction, the
experimental data starting from a one-parameter fit of the $\pi\pi$ scattering
data.
| [
{
"created": "Mon, 6 Nov 1995 08:17:14 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Dobado",
"A.",
""
],
[
"Morales",
"J.",
""
]
] | In this work we present the results of a complete calculation of the $\gamma \gamma\rightarrow \pi^0\pi^0$ amplitude to leading order in the large $N$ approximation ($N$ being the number of Goldstone bosons) up to order $m^2_{\pi}/F^2$. The amplitude turns to be proportional to that of $\pi^+\pi^-\rightarrow \pi^0\pi^0$. In spite of the fact that this factorization property cannot hold in general (as it was recently pointed out by Morgan and Penington), it appears here since in the large $N$ limit only the $I=J=0$ channel contributes to the $\gamma \gamma\rightarrow \pi^0\pi^0$ reaction. Moreover it seems to be a reasonable approximation in this case since it is possible to reproduce, as a prediction, the experimental data starting from a one-parameter fit of the $\pi\pi$ scattering data. |
0806.0418 | Ina Sarcevic | Rikard Enberg (Arizona), Mary Hall Reno (Iowa) and Ina Sarcevic
(Arizona) | Prompt neutrino fluxes from atmospheric charm | 13 pages with 11 figures; expanded discussion, added references,
version to be published in Phys. Rev. D | Phys.Rev.D78:043005,2008 | 10.1103/PhysRevD.78.043005 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the prompt neutrino flux from atmospheric charm production by
cosmic rays, using the dipole picture in a perturbative QCD framework, which
incorporates the parton saturation effects present at high energies. We compare
our results with the next-to-leading order perturbative QCD result and find
that saturation effects are large for neutrino energies above 10^6 GeV, leading
to a substantial suppression of the prompt neutrino flux. We comment on the
range of prompt neutrino fluxes due to theoretical uncertainties.
| [
{
"created": "Tue, 3 Jun 2008 01:06:57 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jul 2008 14:16:48 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Enberg",
"Rikard",
"",
"Arizona"
],
[
"Reno",
"Mary Hall",
"",
"Iowa"
],
[
"Sarcevic",
"Ina",
"",
"Arizona"
]
] | We calculate the prompt neutrino flux from atmospheric charm production by cosmic rays, using the dipole picture in a perturbative QCD framework, which incorporates the parton saturation effects present at high energies. We compare our results with the next-to-leading order perturbative QCD result and find that saturation effects are large for neutrino energies above 10^6 GeV, leading to a substantial suppression of the prompt neutrino flux. We comment on the range of prompt neutrino fluxes due to theoretical uncertainties. |
0803.4110 | Rahul Basu | Rahul Basu, Debajyoti Choudhury and H. S. Mani | Fermionic un-particles, gauge interactions and the $\beta$ function | 15 pages, LateX, uses axocolor.sty, included | Eur.Phys.J.C61:461-470,2009 | 10.1140/epjc/s10052-009-1022-2 | IMSc/2008/03/03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of fermionic unparticles is developed from first principles. It
is shown that any unparticle, whether fermionic or bosonic, can be recast in
terms of a canonically quantized field, but with non-local interaction terms.
We further develop a possible gauge theory for fermionic unparticles. Computing
the consequent contribution of un-fermions to the $\beta$ function of the
theory, it is shown that this can be viewed as the sum of two contributions,
one fermion-like and the other scalar-like. However, if full conformal
invariance is imposed, the latter vanishes identically. We discuss the
consequences thereof as well as some general phenomenological issues.
| [
{
"created": "Fri, 28 Mar 2008 13:17:57 GMT",
"version": "v1"
}
] | 2009-07-22 | [
[
"Basu",
"Rahul",
""
],
[
"Choudhury",
"Debajyoti",
""
],
[
"Mani",
"H. S.",
""
]
] | The dynamics of fermionic unparticles is developed from first principles. It is shown that any unparticle, whether fermionic or bosonic, can be recast in terms of a canonically quantized field, but with non-local interaction terms. We further develop a possible gauge theory for fermionic unparticles. Computing the consequent contribution of un-fermions to the $\beta$ function of the theory, it is shown that this can be viewed as the sum of two contributions, one fermion-like and the other scalar-like. However, if full conformal invariance is imposed, the latter vanishes identically. We discuss the consequences thereof as well as some general phenomenological issues. |
hep-ph/0206113 | Silas R. Beane | Silas R. Beane and Martin J. Savage | Variation of Fundamental Couplings and Nuclear Forces | 16 pages LaTeX, 4 eps figs, 12 ps figs | Nucl.Phys.A713:148-164,2003 | 10.1016/S0375-9474(02)01268-X | NT@UW-02-015 | hep-ph astro-ph hep-lat hep-th nucl-th | null | The dependence of the nuclear force on standard model parameters plays an
important role in bounding time and space variations of fundamental couplings
over cosmological time scales. We discuss the quark-mass dependence of deuteron
and di-neutron binding in a systematic chiral expansion. The leading quark-mass
dependence of the nuclear force arises from one-pion exchange and from local
quark-mass dependent four-nucleon operators with coefficients that are
presently unknown. By varying these coefficients while leaving nuclear
observables at the physical values of the quark masses invariant, we find
scenarios where two-nucleon physics depends both weakly and strongly on the
quark masses. While the determination of these coefficients is an exciting
future opportunity for lattice QCD, we conclude that, at present, bounds on
time and space variations of fundamental parameters from the two-nucleon sector
are much weaker than previously claimed. This brings into question the
reliability of coupling-constant bounds derived from more complex nuclei and
nuclear processes.
| [
{
"created": "Wed, 12 Jun 2002 20:26:55 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 2002 16:23:06 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Beane",
"Silas R.",
""
],
[
"Savage",
"Martin J.",
""
]
] | The dependence of the nuclear force on standard model parameters plays an important role in bounding time and space variations of fundamental couplings over cosmological time scales. We discuss the quark-mass dependence of deuteron and di-neutron binding in a systematic chiral expansion. The leading quark-mass dependence of the nuclear force arises from one-pion exchange and from local quark-mass dependent four-nucleon operators with coefficients that are presently unknown. By varying these coefficients while leaving nuclear observables at the physical values of the quark masses invariant, we find scenarios where two-nucleon physics depends both weakly and strongly on the quark masses. While the determination of these coefficients is an exciting future opportunity for lattice QCD, we conclude that, at present, bounds on time and space variations of fundamental parameters from the two-nucleon sector are much weaker than previously claimed. This brings into question the reliability of coupling-constant bounds derived from more complex nuclei and nuclear processes. |
1302.0672 | Sudhanwa Patra Dr. | Ram Lal Awasthi (HRI, Allhabad), M. K. Parida (CETMS, SOA Univ.,
Bhubaneswar) and Sudhanwa Patra (CETMS, SOA Univ., Bhubaneswar) | Neutrino masses, dominant neutrinoless double beta decay, and observable
lepton flavor violation in left-right models and SO(10) grand unification
with low mass $\bf W_R, Z_R$ bosons | 46 pages latex, 13 figures, 11 Tables, JHEP version accepted for
publication | JHEP 08 (2013) 122 | 10.1007/JHEP08(2013)122 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While the detection of $W_R$-boson at the Large Hadron Collider is likely to
resolve the mystery of parity violation in weak interaction, observation of
neutrinoless double beta decay ($0\nu\beta\beta$) is expected to determine
whether neutrinos are Majorana fermions. In this work we consider a class of LR
models with TeV scale $W_R, Z_R$ bosons but having parity restoration at high
scales where they originate from well known Pati-Salam symmetry or $SO(10)$
grand unified theory minimally extended to accommodate inverse seesaw frame
work for neutrino masses. Most dominant new contribution to neutrinoless double
beta decay is noted to occur via $W_L^{-}W_L^{-}$ mediation involving lighter
sterile neutrino exchanges. The next dominant contribution is found to be
through $W_L^{-}W_R^{-}$ mediation involving both light and heavy right-handed
neutrino or sterile neutrino exchanges. The quark-lepton symmetric origin of
the computed value of the Dirac neutrino mass matrix is also found to play a
crucial role in determining these and other results on lepton flavor violating
branching ratios for $\tau \rightarrow e + \gamma$, $\tau \rightarrow \mu +
\gamma$, and $\mu \rightarrow e + \gamma$ accessible to ongoing search
experiments. The underlying non-unitarity matrix is found to manifest in
substantial CP-violating effects even when the leptonic Dirac phase
$\delta_{\rm CP} \simeq 0, \pi, 2 \pi$. Finally we explore a possible origin of
the model in non-supersymmetric SO(10) grand unified theory where, in addition
to low mass $W_R^\pm$ and $Z_R$ bosons accessible to Large Hadron Collider, the
model is found to predict observable neutron-antineutron oscillation and
lepto-quark gauge boson mediated rare kaon decay with $\mbox{Br} \left(K_{\rm
L} \rightarrow \mu\, \bar{e}\right) \simeq \left(10^{-9}- 10^{-11} \right)$.
| [
{
"created": "Mon, 4 Feb 2013 12:47:41 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Aug 2013 13:50:32 GMT",
"version": "v2"
}
] | 2013-09-03 | [
[
"Awasthi",
"Ram Lal",
"",
"HRI, Allhabad"
],
[
"Parida",
"M. K.",
"",
"CETMS, SOA Univ.,\n Bhubaneswar"
],
[
"Patra",
"Sudhanwa",
"",
"CETMS, SOA Univ., Bhubaneswar"
]
] | While the detection of $W_R$-boson at the Large Hadron Collider is likely to resolve the mystery of parity violation in weak interaction, observation of neutrinoless double beta decay ($0\nu\beta\beta$) is expected to determine whether neutrinos are Majorana fermions. In this work we consider a class of LR models with TeV scale $W_R, Z_R$ bosons but having parity restoration at high scales where they originate from well known Pati-Salam symmetry or $SO(10)$ grand unified theory minimally extended to accommodate inverse seesaw frame work for neutrino masses. Most dominant new contribution to neutrinoless double beta decay is noted to occur via $W_L^{-}W_L^{-}$ mediation involving lighter sterile neutrino exchanges. The next dominant contribution is found to be through $W_L^{-}W_R^{-}$ mediation involving both light and heavy right-handed neutrino or sterile neutrino exchanges. The quark-lepton symmetric origin of the computed value of the Dirac neutrino mass matrix is also found to play a crucial role in determining these and other results on lepton flavor violating branching ratios for $\tau \rightarrow e + \gamma$, $\tau \rightarrow \mu + \gamma$, and $\mu \rightarrow e + \gamma$ accessible to ongoing search experiments. The underlying non-unitarity matrix is found to manifest in substantial CP-violating effects even when the leptonic Dirac phase $\delta_{\rm CP} \simeq 0, \pi, 2 \pi$. Finally we explore a possible origin of the model in non-supersymmetric SO(10) grand unified theory where, in addition to low mass $W_R^\pm$ and $Z_R$ bosons accessible to Large Hadron Collider, the model is found to predict observable neutron-antineutron oscillation and lepto-quark gauge boson mediated rare kaon decay with $\mbox{Br} \left(K_{\rm L} \rightarrow \mu\, \bar{e}\right) \simeq \left(10^{-9}- 10^{-11} \right)$. |
hep-ph/9408237 | Ernest Ma | Ernest Ma | Unifiable Supersymmetric Left-Right Model with E_6 Particle Content | 12 pages (1 figure not included), UCRHEP-T129 (July 1994) | Phys.Lett. B344 (1995) 164-168 | 10.1016/0370-2693(94)01496-Y | null | hep-ph | null | A new supersymmetric gauge model is proposed with particle content chosen
only from the 27 and 27* representations of E_6. The gauge symmetry SU(3) X
SU(2)_L X SU(2)_R X U(1) is realized at the TeV energy scale and the gauge
couplings converge to a single value at around 10^{16} GeV. A discrete Z_4 X
Z_2 symmetry leads to a generalized definition of lepton number and ensures the
absence of tree-level flavor-changing neutral-current interactions at the
electroweak energy scale.
| [
{
"created": "Thu, 4 Aug 1994 22:43:22 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ma",
"Ernest",
""
]
] | A new supersymmetric gauge model is proposed with particle content chosen only from the 27 and 27* representations of E_6. The gauge symmetry SU(3) X SU(2)_L X SU(2)_R X U(1) is realized at the TeV energy scale and the gauge couplings converge to a single value at around 10^{16} GeV. A discrete Z_4 X Z_2 symmetry leads to a generalized definition of lepton number and ensures the absence of tree-level flavor-changing neutral-current interactions at the electroweak energy scale. |
hep-ph/0311136 | Aiichi Iwazaki | A. Iwazaki | Color Ferromagnetism and Quantum Hall states in Quark Matter | Talk at (or Contribution to) the International Workshop on QCD:
QCD@Work 2003 - Conversano (Italy) 14-18 June 2003 (eConf C030614) | null | null | NISHO-2003-3 | hep-ph | null | We discuss a possibility of the presence of a stable color ferromagnetic
state in SU(2) gauge theory of quark matter; a color magnetic field is
spontaneously generated due tothe gluon's dynamics. The state arises between
the hadronic state and the color superconducting state when the density of
quarks is varied. Although the state has been known to have unstable modes, we
show that unstable modes form quantum Hall states, in which the instability
disappears. Namely, the quark matter possesses a stable phase with the
ferromagnetic state and the quantum Hall state of gluons.
| [
{
"created": "Tue, 11 Nov 2003 08:35:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Iwazaki",
"A.",
""
]
] | We discuss a possibility of the presence of a stable color ferromagnetic state in SU(2) gauge theory of quark matter; a color magnetic field is spontaneously generated due tothe gluon's dynamics. The state arises between the hadronic state and the color superconducting state when the density of quarks is varied. Although the state has been known to have unstable modes, we show that unstable modes form quantum Hall states, in which the instability disappears. Namely, the quark matter possesses a stable phase with the ferromagnetic state and the quantum Hall state of gluons. |
hep-ph/0211250 | Matthew J. Lewis | Katherine Freese, Matthew Lewis, and Jan Pieter van der Schaar | Observational Tests of Open Strings in Braneworld Scenarios | Minor grammatical corrections and two reference added. 27 pages, 1
eps figure. Submitted to JHEP | JHEP 0307 (2003) 026 | 10.1088/1126-6708/2003/07/026 | CERN-TH/2002-332; MCTP-02-60 | hep-ph astro-ph hep-th | null | We consider some consequences of describing the gauge and matter degrees of
freedom in our universe by open strings, as suggested by the braneworld
scenario. We focus on the geometric effects described by the open string metric
and investigate their observational implications. The causal structure of
spacetime on the brane is altered; it is described not by the usual metric
$g_{\mu\nu}$, but instead by the open string metric, that incorporates the
electromagnetic background, $G_{\mu\nu} = g_{\mu\nu} - (2\pi \alpha^\prime)^2
(F^2)_{\mu\nu}$. The speed of light is now slower when propagating along
directions transverse to electromagnetic fields or an NS-NS two form, so that
Lorentz invariance is explicitly broken. A generalized equivalence principle
guarantees that the propagation of {\it all} particles, not just photons, (with
the exception of gravitons) is slower in these transverse directions. We
describe a variety of astrophysical and laboratory-based experiments designed
to detect the predicted variations in the causal structure. We show that
current technology cannot probe beyond open string lengths of $10^{-13}$ cm,
corresponding to MeV string scales. We also point out that in a braneworld
scenario, constraints on large scale electromagnetic fields together with a
modest phenomenological bound on the NS-NS two-form naturally lead to a bound
on the scale of canonical noncommutativity that is two orders of magnitude
below the string length. By invoking theoretical constraints on the NS-NS
two-form this bound can be improved to give an extremely strong bound on the
noncommutative scale well below the Planck length, $\sqrt{|\theta|_{max}} <
10^{-35} {\rm cm} \times ({{\rm TeV} \over {\rm string} {\rm scale}}
| [
{
"created": "Fri, 15 Nov 2002 20:44:06 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Nov 2002 23:17:25 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Freese",
"Katherine",
""
],
[
"Lewis",
"Matthew",
""
],
[
"van der Schaar",
"Jan Pieter",
""
]
] | We consider some consequences of describing the gauge and matter degrees of freedom in our universe by open strings, as suggested by the braneworld scenario. We focus on the geometric effects described by the open string metric and investigate their observational implications. The causal structure of spacetime on the brane is altered; it is described not by the usual metric $g_{\mu\nu}$, but instead by the open string metric, that incorporates the electromagnetic background, $G_{\mu\nu} = g_{\mu\nu} - (2\pi \alpha^\prime)^2 (F^2)_{\mu\nu}$. The speed of light is now slower when propagating along directions transverse to electromagnetic fields or an NS-NS two form, so that Lorentz invariance is explicitly broken. A generalized equivalence principle guarantees that the propagation of {\it all} particles, not just photons, (with the exception of gravitons) is slower in these transverse directions. We describe a variety of astrophysical and laboratory-based experiments designed to detect the predicted variations in the causal structure. We show that current technology cannot probe beyond open string lengths of $10^{-13}$ cm, corresponding to MeV string scales. We also point out that in a braneworld scenario, constraints on large scale electromagnetic fields together with a modest phenomenological bound on the NS-NS two-form naturally lead to a bound on the scale of canonical noncommutativity that is two orders of magnitude below the string length. By invoking theoretical constraints on the NS-NS two-form this bound can be improved to give an extremely strong bound on the noncommutative scale well below the Planck length, $\sqrt{|\theta|_{max}} < 10^{-35} {\rm cm} \times ({{\rm TeV} \over {\rm string} {\rm scale}} |
1408.3211 | Kim Siyeon | Sin Kyu Kang, Yeong-Duk Kim, Young-Ju Ko, Kim Siyeon | Four-neutrino analysis of 1.5km-baseline reactor antineutrino
oscillations | 14 pages, 7 figures. arXiv admin note: text overlap with
arXiv:1303.6173 | Adv.High Energy Phys. 2013 (2013) 138109 | 10.1155/2013/138109 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The masses of sterile neutrinos are not yet known, and depending on the
orders of magnitudes, their existence may explain reactor anomalies or the
spectral shape of reactor neutrino events at 1.5km-baseline detector. Here, we
present four-neutrino analysis of the results announced by RENO and Daya Bay,
which performed the definitive measurements of $\theta_{13}$ based on the
disappearance of reactor antineutrinos at km-order baselines. Our results using
3+1 scheme include the exclusion curve of $\Delta m^2_{41}$ vs. $\theta_{14}$
and the adjustment of $\theta_{13}$ due to correlation with $\theta_{14}$. The
value of $\theta_{13}$ obtained by RENO and Daya Bay with a three-neutrino
oscillation analysis is included in the $1\sigma$ interval of $\theta_{13}$
allowed by our four-neutrino analysis.
| [
{
"created": "Thu, 14 Aug 2014 08:02:35 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2014 18:11:28 GMT",
"version": "v2"
}
] | 2014-08-20 | [
[
"Kang",
"Sin Kyu",
""
],
[
"Kim",
"Yeong-Duk",
""
],
[
"Ko",
"Young-Ju",
""
],
[
"Siyeon",
"Kim",
""
]
] | The masses of sterile neutrinos are not yet known, and depending on the orders of magnitudes, their existence may explain reactor anomalies or the spectral shape of reactor neutrino events at 1.5km-baseline detector. Here, we present four-neutrino analysis of the results announced by RENO and Daya Bay, which performed the definitive measurements of $\theta_{13}$ based on the disappearance of reactor antineutrinos at km-order baselines. Our results using 3+1 scheme include the exclusion curve of $\Delta m^2_{41}$ vs. $\theta_{14}$ and the adjustment of $\theta_{13}$ due to correlation with $\theta_{14}$. The value of $\theta_{13}$ obtained by RENO and Daya Bay with a three-neutrino oscillation analysis is included in the $1\sigma$ interval of $\theta_{13}$ allowed by our four-neutrino analysis. |
hep-ph/9805480 | Elisabetta Sassaroli | E. Sassaroli | Neutrino Flavor Mixing and Oscillations in Field Theory | 4 pages, LaTex file, no figures. Contribution to the proceedings of
PASCOS 1998, Northeastern University, March 1998 | null | null | null | hep-ph | null | The Lagrangian that is normally associated with Dirac neutrinos is analyzed
in a complete and simple way through field theory. It is found that the
elements of the neutrino mass matrix are field strength renormalization
constants and that the flavor fields can be directly applied to the
one-particle energy states through these rescaling factors. Moreover this
Lagrangian describes neutrinos which are in a state of mixed flavor at any
space-time point and therefore does not describe the phenomenology of neutrino
oscillations properly, except in the ultra-relativistic limit where such a
description is possible.
| [
{
"created": "Wed, 27 May 1998 15:17:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sassaroli",
"E.",
""
]
] | The Lagrangian that is normally associated with Dirac neutrinos is analyzed in a complete and simple way through field theory. It is found that the elements of the neutrino mass matrix are field strength renormalization constants and that the flavor fields can be directly applied to the one-particle energy states through these rescaling factors. Moreover this Lagrangian describes neutrinos which are in a state of mixed flavor at any space-time point and therefore does not describe the phenomenology of neutrino oscillations properly, except in the ultra-relativistic limit where such a description is possible. |
1911.08873 | Michael Andreas Schmidt | Shyam Balaji and Michael A. Schmidt | Unified SU(4) theory for the $R_{D^{(*)}}$ and $R_{K^{(*)}}$ anomalies | 21 pages, 4 figures; v2: minor changes, matches published version | Phys. Rev. D 101, 015026 (2020) | 10.1103/PhysRevD.101.015026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a chiral Pati-Salam theory based on the gauge group $SU(4)_C\times
SU(2)_L\times SU(2)_R$. The left-handed quarks and leptons are unified into a
fundamental representation of $SU(4)_C$, while right-handed quarks and leptons
have a separate treatment. The deviations measured in the rare semi-leptonic
decays $B\to D^{(*)} \tau\bar\nu$ are explained by a scalar leptoquark which
couples to right-handed fields and is contained in the $SU(4)_C\times SU(2)_R$
breaking scalar multiplet. The measured deviation of lepton flavor universality
in the rare decays $\bar B\to \bar K^{(*)}\ell^+\ell^-$, $\ell=\mu,e$ is
explained via the $SU(4)_C$ leptoquark gauge boson. The model predicts a new
sub-GeV scale sterile neutrino which participates in the anomaly and can be
searched for in upcoming neutrino experiments. The theory satisfies the current
most sensitive experimental constraints and its allowable parameter regions
will be probed as more precise measurements from the LHCb and Belle II
experiments become available.
| [
{
"created": "Wed, 20 Nov 2019 13:04:31 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2020 00:43:36 GMT",
"version": "v2"
}
] | 2020-02-05 | [
[
"Balaji",
"Shyam",
""
],
[
"Schmidt",
"Michael A.",
""
]
] | We propose a chiral Pati-Salam theory based on the gauge group $SU(4)_C\times SU(2)_L\times SU(2)_R$. The left-handed quarks and leptons are unified into a fundamental representation of $SU(4)_C$, while right-handed quarks and leptons have a separate treatment. The deviations measured in the rare semi-leptonic decays $B\to D^{(*)} \tau\bar\nu$ are explained by a scalar leptoquark which couples to right-handed fields and is contained in the $SU(4)_C\times SU(2)_R$ breaking scalar multiplet. The measured deviation of lepton flavor universality in the rare decays $\bar B\to \bar K^{(*)}\ell^+\ell^-$, $\ell=\mu,e$ is explained via the $SU(4)_C$ leptoquark gauge boson. The model predicts a new sub-GeV scale sterile neutrino which participates in the anomaly and can be searched for in upcoming neutrino experiments. The theory satisfies the current most sensitive experimental constraints and its allowable parameter regions will be probed as more precise measurements from the LHCb and Belle II experiments become available. |
1506.06755 | Rui Santos | Duarte Fontes, Jorge C. Rom\~ao, Rui Santos, Jo\~ao P. Silva | Undoubtable signs of CP-violation in Higgs decays at the LHC run 2 | 16 pages | Phys. Rev. D 92, 055014 (2015) | 10.1103/PhysRevD.92.055014 | CFTP/15-006 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the discovery of the Higgs boson at the Large Hadron Collider the high
energy physics community's attention has now turned to understanding the
properties of the Higgs boson, together with the hope of finding more scalars
during run 2. In this work we discuss scenarios where using a combination of
three decays, involving the 125 GeV Higgs boson, the Z boson and at least one
more scalar, an indisputable signal of CP-violation arises. We use a complex
two-Higgs doublet model as a reference model and present some benchmark points
that have passed all current experimental and theoretical constraints, and that
have cross sections large enough to be probed during run 2.
| [
{
"created": "Mon, 22 Jun 2015 20:00:42 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jul 2015 13:35:14 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Aug 2015 10:25:48 GMT",
"version": "v3"
}
] | 2015-09-16 | [
[
"Fontes",
"Duarte",
""
],
[
"Romão",
"Jorge C.",
""
],
[
"Santos",
"Rui",
""
],
[
"Silva",
"João P.",
""
]
] | With the discovery of the Higgs boson at the Large Hadron Collider the high energy physics community's attention has now turned to understanding the properties of the Higgs boson, together with the hope of finding more scalars during run 2. In this work we discuss scenarios where using a combination of three decays, involving the 125 GeV Higgs boson, the Z boson and at least one more scalar, an indisputable signal of CP-violation arises. We use a complex two-Higgs doublet model as a reference model and present some benchmark points that have passed all current experimental and theoretical constraints, and that have cross sections large enough to be probed during run 2. |
1010.5815 | Arlene Cristina Aguilar | A. C. Aguilar and J. Papavassiliou | Chiral symmetry breaking with lattice propagators | 32 pages, 13 figures | Phys.Rev.D83:014013,2011 | 10.1103/PhysRevD.83.014013 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study chiral symmetry breaking using the standard gap equation,
supplemented with the infrared-finite gluon propagator and ghost dressing
function obtained from large-volume lattice simulations. One of the most
important ingredients of this analysis is the non-abelian quark-gluon vertex,
which controls the way the ghost sector enters into the gap equation.
Specifically, this vertex introduces a numerically crucial dependence on the
ghost dressing function and the quark-ghost scattering amplitude. This latter
quantity satisfies its own, previously unexplored, dynamical equation, which
may be decomposed into individual integral equations for its various form
factors. In particular, the scalar form factor is obtained from an approximate
version of the "one-loop dressed" integral equation, and its numerical impact
turns out to be rather considerable. The detailed numerical analysis of the
resulting gap equation reveals that the constituent quark mass obtained is
about 300 MeV, while fermions in the adjoint representation acquire a mass in
the range of (750-962) MeV.
| [
{
"created": "Wed, 27 Oct 2010 21:47:06 GMT",
"version": "v1"
}
] | 2011-02-01 | [
[
"Aguilar",
"A. C.",
""
],
[
"Papavassiliou",
"J.",
""
]
] | We study chiral symmetry breaking using the standard gap equation, supplemented with the infrared-finite gluon propagator and ghost dressing function obtained from large-volume lattice simulations. One of the most important ingredients of this analysis is the non-abelian quark-gluon vertex, which controls the way the ghost sector enters into the gap equation. Specifically, this vertex introduces a numerically crucial dependence on the ghost dressing function and the quark-ghost scattering amplitude. This latter quantity satisfies its own, previously unexplored, dynamical equation, which may be decomposed into individual integral equations for its various form factors. In particular, the scalar form factor is obtained from an approximate version of the "one-loop dressed" integral equation, and its numerical impact turns out to be rather considerable. The detailed numerical analysis of the resulting gap equation reveals that the constituent quark mass obtained is about 300 MeV, while fermions in the adjoint representation acquire a mass in the range of (750-962) MeV. |
1511.03632 | Nosheen Akbar | Nosheen Akbar, M. Atif Sultan, Bilal Masud, Faisal Akram | Higher Hybrid Bottomonia in an Extended Potential Model | 20 pages,1 figures | Phys. Rev. D 95, 074018 (2017) | 10.1103/PhysRevD.95.074018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using our extension of the quark potential model to hybrid mesons that fits
well to the available lattice results, we now calculate the masses, radii, wave
functions at origin, leptonic and two photon decay widths, E1 and M1 radiative
transitions for a significant number of bottomonium mesons. These mesons
include both conventional and hybrid ones with radial and angular excitations.
Our numerical solutions of the Schrodinger equation are related to QCD through
the Born-Oppenheimer approach. Relativistic corrections in masses and decay
widths are also calculated by applying the leading order perturbation theory.
The calculated results are compared with available experimental data and the
theoretical results by other groups. We also identify the states of
$\Upsilon(10860)$, $\Upsilon(11020)$, and $Y_b(10890)$ mesons by comparing
their experimental masses and decay widths with our results.
| [
{
"created": "Wed, 11 Nov 2015 19:59:22 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Dec 2015 16:41:16 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Apr 2017 07:36:44 GMT",
"version": "v3"
}
] | 2017-04-21 | [
[
"Akbar",
"Nosheen",
""
],
[
"Sultan",
"M. Atif",
""
],
[
"Masud",
"Bilal",
""
],
[
"Akram",
"Faisal",
""
]
] | Using our extension of the quark potential model to hybrid mesons that fits well to the available lattice results, we now calculate the masses, radii, wave functions at origin, leptonic and two photon decay widths, E1 and M1 radiative transitions for a significant number of bottomonium mesons. These mesons include both conventional and hybrid ones with radial and angular excitations. Our numerical solutions of the Schrodinger equation are related to QCD through the Born-Oppenheimer approach. Relativistic corrections in masses and decay widths are also calculated by applying the leading order perturbation theory. The calculated results are compared with available experimental data and the theoretical results by other groups. We also identify the states of $\Upsilon(10860)$, $\Upsilon(11020)$, and $Y_b(10890)$ mesons by comparing their experimental masses and decay widths with our results. |
1309.0313 | Wei Wang | Xin Liu, Wei Wang, Yuehong Xie | Penguin Pollution in $B\to J/\psi V$ Decays and Impact on the Extraction
of the $B_s-\bar B_s$ mixing phase | 19 pages, 3 figures; v2: ratios of branching fractions updated | Phys. Rev. D 89, 094010 (2014) | 10.1103/PhysRevD.89.094010 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate the most-general time-dependent decay distributions of $B_s\to
J/\psi (\to l^+l^-) \phi(\to K^+K^-)$ in which the direct CP violation is
explicitly incorporated. We then investigate the $B \to J/\psi V$ decays in the
perturbative QCD approach where $V$ is a light vector meson. Apart from the
leading-order factorizable contributions, we also take into account various QCD
corrections and the hard-spectator diagrams. With the inclusion of these
sizable corrections, our theoretical results for CP-averaged branching ratios,
polarization fractions, CP-violating asymmetries, and relative phases are in
good consistency with the available data. Based on the global agreement, we
further explore the penguin contributions and point out that the $\phi_s$
extracted from $B_s\to J/\psi \phi$ can be shifted away by ${\cal O}(10^{-3})$.
| [
{
"created": "Mon, 2 Sep 2013 07:48:35 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jul 2015 09:22:18 GMT",
"version": "v2"
}
] | 2015-07-13 | [
[
"Liu",
"Xin",
""
],
[
"Wang",
"Wei",
""
],
[
"Xie",
"Yuehong",
""
]
] | We formulate the most-general time-dependent decay distributions of $B_s\to J/\psi (\to l^+l^-) \phi(\to K^+K^-)$ in which the direct CP violation is explicitly incorporated. We then investigate the $B \to J/\psi V$ decays in the perturbative QCD approach where $V$ is a light vector meson. Apart from the leading-order factorizable contributions, we also take into account various QCD corrections and the hard-spectator diagrams. With the inclusion of these sizable corrections, our theoretical results for CP-averaged branching ratios, polarization fractions, CP-violating asymmetries, and relative phases are in good consistency with the available data. Based on the global agreement, we further explore the penguin contributions and point out that the $\phi_s$ extracted from $B_s\to J/\psi \phi$ can be shifted away by ${\cal O}(10^{-3})$. |
hep-ph/9810308 | Wilfried Buchmuller | W. Buchm\"uller, T. Yanagida | Quark Lepton Mass Hierarchies and the Baryon Asymmetry | 7 pages | Phys.Lett. B445 (1999) 399-402 | 10.1016/S0370-2693(98)01480-4 | DESY-98-155 | hep-ph | null | The mass hierarchies of quarks and charged leptons as well as a large
$\n_\m$-$\n_\t$ mixing angle are naturally explained by the Frogatt-Nielsen
mechanism with a nonparallel family structure of chiral charges. We extend this
mechanism to right-handed neutrinos. Their out-of-equilibrium decay generates a
cosmological baryon asymmetry whose size is quantized in powers of the
hierarchy parameter $\e^2$. For the simplest hierarchy pattern the neutrino
mass $\bar{m}_\n= (m_{\n_\m}m_{\n_\t})^{1/2} \sim 10^{-2}$ eV, which is
inferred from present indications for neutrino oscillations, implies a baryon
asymmetry $n_B/s \sim 10^{-10}$. The corresponding baryogenesis temperature is
$T_B \sim 10^{10}$ GeV.
| [
{
"created": "Fri, 9 Oct 1998 12:56:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Buchmüller",
"W.",
""
],
[
"Yanagida",
"T.",
""
]
] | The mass hierarchies of quarks and charged leptons as well as a large $\n_\m$-$\n_\t$ mixing angle are naturally explained by the Frogatt-Nielsen mechanism with a nonparallel family structure of chiral charges. We extend this mechanism to right-handed neutrinos. Their out-of-equilibrium decay generates a cosmological baryon asymmetry whose size is quantized in powers of the hierarchy parameter $\e^2$. For the simplest hierarchy pattern the neutrino mass $\bar{m}_\n= (m_{\n_\m}m_{\n_\t})^{1/2} \sim 10^{-2}$ eV, which is inferred from present indications for neutrino oscillations, implies a baryon asymmetry $n_B/s \sim 10^{-10}$. The corresponding baryogenesis temperature is $T_B \sim 10^{10}$ GeV. |
hep-ph/9807447 | Gronau | Michael Gronau and Jonathan L. Rosner Comments 8 pages, 1 figure,
Latex | Final State Interaction Effects on $\gamma$ from $B \to D K$ | null | Phys.Lett. B439 (1998) 171-175 | 10.1016/S0370-2693(98)00988-5 | null | hep-ph | null | The implications of a negligible annihilation contribution in $B \to D K$
decays are reanalyzed and are shown to lead to no new constraints on the weak
phase $\gamma$ from color-allowed $B^{\pm} \to D K^{\pm}$ decays. A test of
negligible annihilation is proposed in $B^+ \to D^+ K^0$ (or $B^+ \to D^+
K^{*0}$), and an application is presented in which $\gamma$ can be determined
from these processes (or corresponding $B \to D K^*$ decays) supplemented with
isospin-related neutral $B$ decays.
| [
{
"created": "Tue, 21 Jul 1998 15:11:08 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Gronau",
"Michael",
""
],
[
"pages",
"Jonathan L. Rosner Comments 8",
""
],
[
"figure",
"1",
""
],
[
"Latex",
"",
""
]
] | The implications of a negligible annihilation contribution in $B \to D K$ decays are reanalyzed and are shown to lead to no new constraints on the weak phase $\gamma$ from color-allowed $B^{\pm} \to D K^{\pm}$ decays. A test of negligible annihilation is proposed in $B^+ \to D^+ K^0$ (or $B^+ \to D^+ K^{*0}$), and an application is presented in which $\gamma$ can be determined from these processes (or corresponding $B \to D K^*$ decays) supplemented with isospin-related neutral $B$ decays. |
2205.11919 | Tomohiro Abe | Tomohiro Abe, Yu Hamada | A model of pseudo-Nambu-Goldstone dark matter from a softly broken
$SU(2)$ global symmetry with a $U(1)$ gauge symmetry | 30 pages, 10 figures. v3: Published version in PTEP | null | 10.1093/ptep/ptad021 | KEK-TH-2428 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | A model of the pseudo-Nambu-Goldstone (pNG) dark matter (DM) is proposed. We
assume that there is an $SU(2)_g$ global symmetry and a $U(1)_X$ gauge symmetry
in the dark sector, and they are spontaneously broken into a $U(1)_D$ global
symmetry after a scalar field develops a vacuum expectation value. We add a
soft symmetry breaking term that breaks the $SU(2)_g$ global symmetry into the
$U(1)_g$ global symmetry explicitly. Our model predicts a stable complex pNG
particle under the $U(1)_D$ global symmetry. One of the virtues of the pNG DM
models is that the models can explain the current null results in the direct
detection experiments. The small momentum transfer suppresses the scattering
amplitudes thanks to the low energy behavior of the Nambu-Goldstone boson. In
our model, the soft symmetry breaking term is uniquely determined. This is the
advantage of our model to some earlier works in which some soft symmetry
breaking terms cannot be forbidden but are simply assumed to be absent to avoid
the constraints from the direct detection experiments. We calculate the thermal
relic abundance of the pNG DM and find that model can explain the measured
value of the DM energy density under some constraints from the perturbative
unitarity.
| [
{
"created": "Tue, 24 May 2022 09:25:54 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jun 2022 06:41:39 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Feb 2023 12:02:06 GMT",
"version": "v3"
}
] | 2023-02-17 | [
[
"Abe",
"Tomohiro",
""
],
[
"Hamada",
"Yu",
""
]
] | A model of the pseudo-Nambu-Goldstone (pNG) dark matter (DM) is proposed. We assume that there is an $SU(2)_g$ global symmetry and a $U(1)_X$ gauge symmetry in the dark sector, and they are spontaneously broken into a $U(1)_D$ global symmetry after a scalar field develops a vacuum expectation value. We add a soft symmetry breaking term that breaks the $SU(2)_g$ global symmetry into the $U(1)_g$ global symmetry explicitly. Our model predicts a stable complex pNG particle under the $U(1)_D$ global symmetry. One of the virtues of the pNG DM models is that the models can explain the current null results in the direct detection experiments. The small momentum transfer suppresses the scattering amplitudes thanks to the low energy behavior of the Nambu-Goldstone boson. In our model, the soft symmetry breaking term is uniquely determined. This is the advantage of our model to some earlier works in which some soft symmetry breaking terms cannot be forbidden but are simply assumed to be absent to avoid the constraints from the direct detection experiments. We calculate the thermal relic abundance of the pNG DM and find that model can explain the measured value of the DM energy density under some constraints from the perturbative unitarity. |
1701.05514 | Oleksandr Tomalak | Oleksandr Tomalak | Forward two-photon exchange in elastic lepton-proton scattering and
hyperfine-splitting correction | 27 pages, 7 figures, correct description of corrections | Eur. Phys. J. C 77, no. 8, 517 (2017) | 10.1140/epjc/s10052-017-5087-z | null | hep-ph nucl-ex nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We relate the forward two-photon exchange (TPE) amplitudes to integrals of
the inclusive lepton-proton scattering cross sections. These relations yield an
alternative way for the evaluation of the TPE correction to hyperfine-splitting
(HFS) in the hydrogen-like atoms with an equivalent to the standard approach
(Iddings, Drell and Sullivan) result implying the Burkhardt-Cottingham sum
rule. For evaluation of the individual effects (e.g., elastic contribution) our
approach yields a distinct result. We compare both methods numerically on
examples of the elastic contribution and the full TPE correction to HFS in
electronic and muonic hydrogen.
| [
{
"created": "Thu, 19 Jan 2017 17:13:41 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2017 12:59:02 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Feb 2017 02:26:56 GMT",
"version": "v3"
},
{
"created": "Mon, 7 Aug 2017 17:08:43 GMT",
"version": "v4"
},
{
"created": "Thu, 21 Sep 2017 14:51:52 GMT",
"version": "v5"
}
] | 2017-09-22 | [
[
"Tomalak",
"Oleksandr",
""
]
] | We relate the forward two-photon exchange (TPE) amplitudes to integrals of the inclusive lepton-proton scattering cross sections. These relations yield an alternative way for the evaluation of the TPE correction to hyperfine-splitting (HFS) in the hydrogen-like atoms with an equivalent to the standard approach (Iddings, Drell and Sullivan) result implying the Burkhardt-Cottingham sum rule. For evaluation of the individual effects (e.g., elastic contribution) our approach yields a distinct result. We compare both methods numerically on examples of the elastic contribution and the full TPE correction to HFS in electronic and muonic hydrogen. |
0805.2090 | Vladimir Zoller | R. Fiore and V.R. Zoller | Full of charm neutrino DIS | 4 pages, 1 figure To appear in the Proceedings of the 43rd Rencontres
de Moriond "QCD and High Energy Interactions" La Thuile, Aosta Valley, Italy,
08-15 March 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The color dipole analysis of small-$(x, Q^2)$ neutrino DIS induced by the
charmed-strange ($cs$) current reveals ordering of dipole sizes
$m_c^{-2}<r^2<m_s^{-2}$ typical of the Double Leading Log Approximation (DLLA).
The DLLA resummation leads to the $cs$ component of the longitudinal structure
function $F_L$ rising to small $x$ much faster than its light quark component.
Based on the color dipole BFKL approach we report quantitative predictions for
this effect in the kinematical range of the CCFR/NuTeV experiment.
| [
{
"created": "Wed, 14 May 2008 15:26:58 GMT",
"version": "v1"
}
] | 2008-05-15 | [
[
"Fiore",
"R.",
""
],
[
"Zoller",
"V. R.",
""
]
] | The color dipole analysis of small-$(x, Q^2)$ neutrino DIS induced by the charmed-strange ($cs$) current reveals ordering of dipole sizes $m_c^{-2}<r^2<m_s^{-2}$ typical of the Double Leading Log Approximation (DLLA). The DLLA resummation leads to the $cs$ component of the longitudinal structure function $F_L$ rising to small $x$ much faster than its light quark component. Based on the color dipole BFKL approach we report quantitative predictions for this effect in the kinematical range of the CCFR/NuTeV experiment. |
2211.02610 | John Hardin | J.M. Hardin, I. Martinez-Soler, A. Diaz, M. Jin, N.W. Kamp, C.A.
Arg\"uelles, J.M. Conrad, M.H. Shaevitz | New Clues About Light Sterile Neutrinos: Preference for Models with
Damping Effects in Global Fits | Minor updates addressing referee comments | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article reports global fits of short-baseline neutrino data to
oscillation models involving light sterile neutrinos. In the commonly-used 3+1
plane wave model, there is a well-known 4.9$\sigma$ tension between data sets
sensitive to appearance versus disappearance of neutrinos. We find that models
that damp the oscillation prediction for the reactor data sets, especially at
low energy, substantially improve the fits and reduce the tension. We consider
two such scenarios. The first scenario introduces the quantum mechanical
wavepacket effect that accounts for the source size in reactor experiments into
the 3+1 model. We find that inclusion of the wavepacket effect greatly improves
the overall fit compared to a 3$\nu$ model by $\Delta \chi^2/$DOF$=61.1/4$
($7.1\sigma$ improvement) with best-fit $\Delta m^2=1.4$ eV$^2$ and wavepacket
length of 67fm. The internal tension is reduced to 3.4$\sigma$. If reactor-data
only is fit, then the wavepacket preferred length is 91 fm ($>20$ fm at 99\%
CL). The second model introduces oscillations involving sterile flavor and
allows the decay of the heaviest, mostly sterile mass state, $\nu_4$. This
model introduces a damping term similar to the wavepacket effect, but across
all experiments. Compared to a three-neutrino fit, this has a $\Delta
\chi^2/$DOF$=60.6/4$ ($7\sigma$ improvement) with preferred $\Delta m^2=1.4$
eV$^2$ and decay $\Gamma = 0.35$ eV$^2$. The internal tension is reduced to
3.7$\sigma$.
For many years, the reactor event rates have been observed to have structure
that deviates from prediction. Community discussion has focused on an excess
compared to prediction observed at 5 MeV; however, other deviations are
apparent. This structure has $L$ dependence that is well-fit by the damped
models. Before assuming this points to new physics, we urge closer examination
of systematic effects that could lead to this $L$ dependence.
| [
{
"created": "Fri, 4 Nov 2022 17:29:35 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2022 18:39:09 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Apr 2023 20:52:21 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Apr 2023 21:06:04 GMT",
"version": "v4"
},
{
"created": "Fri, 11 Aug 2023 19:43:44 GMT",
"version": "v5"
}
] | 2023-08-15 | [
[
"Hardin",
"J. M.",
""
],
[
"Martinez-Soler",
"I.",
""
],
[
"Diaz",
"A.",
""
],
[
"Jin",
"M.",
""
],
[
"Kamp",
"N. W.",
""
],
[
"Argüelles",
"C. A.",
""
],
[
"Conrad",
"J. M.",
""
],
[
"Shaevitz",
"M. H.",
""
]
] | This article reports global fits of short-baseline neutrino data to oscillation models involving light sterile neutrinos. In the commonly-used 3+1 plane wave model, there is a well-known 4.9$\sigma$ tension between data sets sensitive to appearance versus disappearance of neutrinos. We find that models that damp the oscillation prediction for the reactor data sets, especially at low energy, substantially improve the fits and reduce the tension. We consider two such scenarios. The first scenario introduces the quantum mechanical wavepacket effect that accounts for the source size in reactor experiments into the 3+1 model. We find that inclusion of the wavepacket effect greatly improves the overall fit compared to a 3$\nu$ model by $\Delta \chi^2/$DOF$=61.1/4$ ($7.1\sigma$ improvement) with best-fit $\Delta m^2=1.4$ eV$^2$ and wavepacket length of 67fm. The internal tension is reduced to 3.4$\sigma$. If reactor-data only is fit, then the wavepacket preferred length is 91 fm ($>20$ fm at 99\% CL). The second model introduces oscillations involving sterile flavor and allows the decay of the heaviest, mostly sterile mass state, $\nu_4$. This model introduces a damping term similar to the wavepacket effect, but across all experiments. Compared to a three-neutrino fit, this has a $\Delta \chi^2/$DOF$=60.6/4$ ($7\sigma$ improvement) with preferred $\Delta m^2=1.4$ eV$^2$ and decay $\Gamma = 0.35$ eV$^2$. The internal tension is reduced to 3.7$\sigma$. For many years, the reactor event rates have been observed to have structure that deviates from prediction. Community discussion has focused on an excess compared to prediction observed at 5 MeV; however, other deviations are apparent. This structure has $L$ dependence that is well-fit by the damped models. Before assuming this points to new physics, we urge closer examination of systematic effects that could lead to this $L$ dependence. |
2207.13213 | Pierre Ramond | Pierre Ramond | Tri-Bi-Maximal Mixing in Asymmetric Textures | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | At the occasion of his eighty fifth birthday, I wish to to recognize the
crucial role that my advisor, Professor Ayalam Balachandran, played in enabling
me to evolve from engineering to physics. So many years later, this student
presents his latest efforts: the importance of asymmetry in the Yukawa
matrices. We start with a purely phenomenological approach with Tri-Bi-Maximal
mixing as input: it predicts the value of the CP-violating angle with the three
mixing angles within one sigma of their pdf values. To ensure as much
naturalness as possible, a model which starts from $SU_5$ and extends to $E_6$
is discussed, in the context of finite family groups which are subgroups $G_2$.
| [
{
"created": "Tue, 26 Jul 2022 23:32:26 GMT",
"version": "v1"
}
] | 2022-07-28 | [
[
"Ramond",
"Pierre",
""
]
] | At the occasion of his eighty fifth birthday, I wish to to recognize the crucial role that my advisor, Professor Ayalam Balachandran, played in enabling me to evolve from engineering to physics. So many years later, this student presents his latest efforts: the importance of asymmetry in the Yukawa matrices. We start with a purely phenomenological approach with Tri-Bi-Maximal mixing as input: it predicts the value of the CP-violating angle with the three mixing angles within one sigma of their pdf values. To ensure as much naturalness as possible, a model which starts from $SU_5$ and extends to $E_6$ is discussed, in the context of finite family groups which are subgroups $G_2$. |
1304.7476 | Chris Kouvaris | Chris Kouvaris | Composite Millicharged Dark Matter | 10 pages, published version | Phys.Rev. D88 (2013) 015001 | 10.1103/PhysRevD.88.015001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a composite millicharged dark matter model. The dark matter is in
the form of pion-like objects emerging from a higher scale QCD-like theory. We
present two distinct possibilities with interesting phenomenological
consequences based on the choice of the parameters. In the first one, the dark
matter is produced non-thermally and it could potentially account for the 130
GeV Fermi photon line via decays of the "dark pions". We estimate the
self-interaction cross section which might play an important role both in
changing the dark matter halo profile at the center of the galaxy and in making
the dark matter warmer. In the second version the dark matter is produced via
the freeze-in mechanism. Finally we impose all possible astrophysical,
cosmological and experimental constraints. We study in detail generic
constraints on millicharged dark matter that can arise from anomalous isotope
searches of different elements and we show why constraints based on direct
searches from underground detectors are not generally valid.
| [
{
"created": "Sun, 28 Apr 2013 15:10:40 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Aug 2013 20:38:53 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Kouvaris",
"Chris",
""
]
] | We study a composite millicharged dark matter model. The dark matter is in the form of pion-like objects emerging from a higher scale QCD-like theory. We present two distinct possibilities with interesting phenomenological consequences based on the choice of the parameters. In the first one, the dark matter is produced non-thermally and it could potentially account for the 130 GeV Fermi photon line via decays of the "dark pions". We estimate the self-interaction cross section which might play an important role both in changing the dark matter halo profile at the center of the galaxy and in making the dark matter warmer. In the second version the dark matter is produced via the freeze-in mechanism. Finally we impose all possible astrophysical, cosmological and experimental constraints. We study in detail generic constraints on millicharged dark matter that can arise from anomalous isotope searches of different elements and we show why constraints based on direct searches from underground detectors are not generally valid. |
hep-ph/9504428 | Alakabha Datta | Alakabha Datta | Non-Leptonic two body decays of Charmed and \Lambda_b Baryons | 15 pages, Latex, no figures, minor typing errors corrected | null | null | UH-511-824-95 | hep-ph | null | We calculate the two body Cabibbo allowed non-leptonic decays of charmed
baryons $\Lambda_c$ and $\Xi_c$ which involve transitions of a heavy quark to a
light quark. We use data on the Cabbibo favoured non-leptonic decays $\Lambda_c
\rightarrow \Lambda \pi^{+}$ and $\Lambda_c \rightarrow \Sigma^{+} \pi^{0 }$ to
obtain information on the form factors in the $c \rightarrow s $ transition. We
also calculate the decay $\Lambda_c \rightarrow p \phi$. Using HQET the
information on form factors from the $c \rightarrow s $ transition is used to
model the form factors in $b \rightarrow s $ transition which are then used in
the study of $\Lambda_b \rightarrow J/ \psi \Lambda $ decay.
| [
{
"created": "Sat, 29 Apr 1995 00:24:01 GMT",
"version": "v1"
},
{
"created": "Mon, 1 May 1995 01:06:48 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Datta",
"Alakabha",
""
]
] | We calculate the two body Cabibbo allowed non-leptonic decays of charmed baryons $\Lambda_c$ and $\Xi_c$ which involve transitions of a heavy quark to a light quark. We use data on the Cabbibo favoured non-leptonic decays $\Lambda_c \rightarrow \Lambda \pi^{+}$ and $\Lambda_c \rightarrow \Sigma^{+} \pi^{0 }$ to obtain information on the form factors in the $c \rightarrow s $ transition. We also calculate the decay $\Lambda_c \rightarrow p \phi$. Using HQET the information on form factors from the $c \rightarrow s $ transition is used to model the form factors in $b \rightarrow s $ transition which are then used in the study of $\Lambda_b \rightarrow J/ \psi \Lambda $ decay. |
1008.4197 | Simonetta Liuti | K. Holcomb, S. Liuti and D.Z. Perry | Self-Organizing Maps and Parton Distributions Functions | 8 pages, 4 figures, to appear in the proceedings of "Workshop on
Exclusive Reactions at High Momentum Transfer (IV)", Jefferson Lab, May 18th
-21st, 2010 | null | 10.1142/9789814329569_0008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new method to extract parton distribution functions from high
energy experimental data based on a specific type of neural networks, the
Self-Organizing Maps. We illustrate the features of our new procedure that are
particularly useful for an anaysis directed at extracting generalized parton
distributions from data. We show quantitative results of our initial analysis
of the parton distribution functions from inclusive deep inelastic scattering.
| [
{
"created": "Wed, 25 Aug 2010 03:43:04 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Holcomb",
"K.",
""
],
[
"Liuti",
"S.",
""
],
[
"Perry",
"D. Z.",
""
]
] | We present a new method to extract parton distribution functions from high energy experimental data based on a specific type of neural networks, the Self-Organizing Maps. We illustrate the features of our new procedure that are particularly useful for an anaysis directed at extracting generalized parton distributions from data. We show quantitative results of our initial analysis of the parton distribution functions from inclusive deep inelastic scattering. |
0805.0784 | Alexei Bazavov | Alexei Bazavov, Bernd A. Berg, Adrian Dumitru | Thermalization in SU(3) gauge theory after a deconfining quench | 7 pages, 7 figures | Phys.Rev.D78:034024,2008 | 10.1103/PhysRevD.78.034024 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the time evolution of fluctuations of the Polyakov loop after a
quench into the deconfined phase of SU(3) gauge theory from a simple classical
relativistic Lagrangian. We compare the structure factors, which indicate
spinodal decomposition followed by relaxation, to those obtained via Markov
Chain Monte Carlo techniques in SU(3) lattice gauge theory. We find that the
time when the structure factor peaks diverges like $\sim 1/k^2$ in the
long-wavelength limit. This is due to formation of competing Z(3) domains for
configurations where the Polyakov loop exhibits non-perturbatively large
variations in space, which delay thermalization of long wavelength modes. For
realistic temperatures, and away from the extreme weak-coupling limit, we find
that even modes with $k$ on the order of $T$ experience delayed thermalization.
Relaxation times of very long wavelength modes are found to be on the order of
the size of the system; thus, the dynamics of competing domains should
accompany the hydrodynamic description of the deconfined vacuum.
| [
{
"created": "Tue, 6 May 2008 19:36:15 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bazavov",
"Alexei",
""
],
[
"Berg",
"Bernd A.",
""
],
[
"Dumitru",
"Adrian",
""
]
] | We determine the time evolution of fluctuations of the Polyakov loop after a quench into the deconfined phase of SU(3) gauge theory from a simple classical relativistic Lagrangian. We compare the structure factors, which indicate spinodal decomposition followed by relaxation, to those obtained via Markov Chain Monte Carlo techniques in SU(3) lattice gauge theory. We find that the time when the structure factor peaks diverges like $\sim 1/k^2$ in the long-wavelength limit. This is due to formation of competing Z(3) domains for configurations where the Polyakov loop exhibits non-perturbatively large variations in space, which delay thermalization of long wavelength modes. For realistic temperatures, and away from the extreme weak-coupling limit, we find that even modes with $k$ on the order of $T$ experience delayed thermalization. Relaxation times of very long wavelength modes are found to be on the order of the size of the system; thus, the dynamics of competing domains should accompany the hydrodynamic description of the deconfined vacuum. |
1306.2658 | Xiao-Gang He | Xiao-Gang He, Siao-Fong Li, Hsiu-Hsien Lin | CP Violation in $B^0_s \to K^-\pi^+$, $B^0 \to K^+\pi^-$ Decays and
Tests for SU(3) Flavor Symmetry Predictions | RevTex, 16 pages with no figures. A new reference added and some
minor modifications | null | 10.1007/JHEP08(2013)065 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHCb collaboration has recently measured the first direct CP violation in
$B^0_s$ decays with a rate asymmetry $A_{CP}(B^0_s\to K^- \pi^+)$ given by
$0.27 \pm 0.04(stat)\pm 0.01(syst)$. At the same time they also made the most
precise measurement for $A_{CP}(B^0 \to K^+ \pi^-) = -0.080\pm 0.007(stat)\pm
0.003(syst)$. These data confirm the predicted relation, $A_{CP}(B^0 \to K^+
\pi^-)/A_{CP}(B^0_s \to K^- \pi^+) = - Br(B^0_s\to K^- \pi^+)\tau_{B^0}/Br(B^0
\to K^+ \pi^-)\tau_{B^0_s}$, in the standard model with SU(3) flavor symmetry.
We discuss possible modifications due to SU(3) breaking effects to this
relation. There are several other similar relations in B decays. Using current
available data we study whether relevant relations hold in $B^0$ and $B^0_s$ to
$PP$ and $PV$ decays. Here $P$ and $V$ indicate pesudoscalar and vector mesons
in the flavor octet representations.
| [
{
"created": "Tue, 11 Jun 2013 20:49:48 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2013 01:27:16 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"He",
"Xiao-Gang",
""
],
[
"Li",
"Siao-Fong",
""
],
[
"Lin",
"Hsiu-Hsien",
""
]
] | The LHCb collaboration has recently measured the first direct CP violation in $B^0_s$ decays with a rate asymmetry $A_{CP}(B^0_s\to K^- \pi^+)$ given by $0.27 \pm 0.04(stat)\pm 0.01(syst)$. At the same time they also made the most precise measurement for $A_{CP}(B^0 \to K^+ \pi^-) = -0.080\pm 0.007(stat)\pm 0.003(syst)$. These data confirm the predicted relation, $A_{CP}(B^0 \to K^+ \pi^-)/A_{CP}(B^0_s \to K^- \pi^+) = - Br(B^0_s\to K^- \pi^+)\tau_{B^0}/Br(B^0 \to K^+ \pi^-)\tau_{B^0_s}$, in the standard model with SU(3) flavor symmetry. We discuss possible modifications due to SU(3) breaking effects to this relation. There are several other similar relations in B decays. Using current available data we study whether relevant relations hold in $B^0$ and $B^0_s$ to $PP$ and $PV$ decays. Here $P$ and $V$ indicate pesudoscalar and vector mesons in the flavor octet representations. |
hep-ph/9609395 | Naoyuki Haba | Naoyuki Haba (Nagoya University, Nagoya, Japan) | Can the Higgs Sector Trigger CP Violation in the MSSM? | 13 pages, LaTex | Phys.Lett.B398:305-310,1997 | 10.1016/S0370-2693(97)00247-5 | DPNU-96-49 | hep-ph | null | We reanalyze the possibility of CP violation in the Higgs sector of the
minimal supersymmetric standard model (MSSM). Contrary to the result of
previous analysis, spontaneous CP violation can not occur by only chargino and
neutralino radiative corrections since the vacuum does not stable. Top and stop
radiative corrections are crucially needed. However even with this correction
there is no experimentally allowed region in \tan \beta \geq 1. This situation
is not remedied even if the stop left-right mixing is included. We also analyze
explicit CP violation in the Higgs sector of the MSSM and show that the effect
is too small to influence the phenomenology. We thus show that the Higgs sector
can not, by itself, trigger CP violation in the MSSM.
| [
{
"created": "Wed, 18 Sep 1996 09:16:05 GMT",
"version": "v1"
}
] | 2011-01-13 | [
[
"Haba",
"Naoyuki",
"",
"Nagoya University, Nagoya, Japan"
]
] | We reanalyze the possibility of CP violation in the Higgs sector of the minimal supersymmetric standard model (MSSM). Contrary to the result of previous analysis, spontaneous CP violation can not occur by only chargino and neutralino radiative corrections since the vacuum does not stable. Top and stop radiative corrections are crucially needed. However even with this correction there is no experimentally allowed region in \tan \beta \geq 1. This situation is not remedied even if the stop left-right mixing is included. We also analyze explicit CP violation in the Higgs sector of the MSSM and show that the effect is too small to influence the phenomenology. We thus show that the Higgs sector can not, by itself, trigger CP violation in the MSSM. |
hep-ph/9505234 | null | Zheng Huang and Mahiko Suzuki (LBL) | Isospin Coherence and Final-State Scattering of Disoriented Chiral
Condensate | 12 pages, one uuencoded postscript figure | Phys.Rev.D52:2610-2613,1995 | 10.1103/PhysRevD.52.R2610 | LBL-37189, UCB-PTH-95/12 | hep-ph nucl-th | null | We examine the validity of the notion of the coherent state for pions and the
quantum scattering effect in the final state of pion emission. When the number
of particles is large, the effect caused by the small but finite mass
difference between the neutral and charged pions can add up substantially in
the quantum evolution of an initially coherent state. As a result, the states
with quite different numbers of neutral or charged pions are essentially
incoherent. The importance of the quantum scattering in the final-state isospin
charge distribution of a disoriented chiral condensate (DCC) is investigated.
We find that the scattering effect significantly reduces the spectacular
Centauro and anti-Centauro events. The deformation of a charge distribution
$dP/df$ predicted by the classical field theory is significant only for a DCC
with the size of 10 fm or more.
| [
{
"created": "Fri, 5 May 1995 01:01:08 GMT",
"version": "v1"
}
] | 2010-01-08 | [
[
"Huang",
"Zheng",
"",
"LBL"
],
[
"Suzuki",
"Mahiko",
"",
"LBL"
]
] | We examine the validity of the notion of the coherent state for pions and the quantum scattering effect in the final state of pion emission. When the number of particles is large, the effect caused by the small but finite mass difference between the neutral and charged pions can add up substantially in the quantum evolution of an initially coherent state. As a result, the states with quite different numbers of neutral or charged pions are essentially incoherent. The importance of the quantum scattering in the final-state isospin charge distribution of a disoriented chiral condensate (DCC) is investigated. We find that the scattering effect significantly reduces the spectacular Centauro and anti-Centauro events. The deformation of a charge distribution $dP/df$ predicted by the classical field theory is significant only for a DCC with the size of 10 fm or more. |
hep-ph/9502260 | null | J.L. Feng, H. Murayama, M.E. Peskin, and X. Tata | TESTING SUPERSYMMETRY AT THE NEXT LINEAR COLLIDER | 26pp, Revtex, 7 figures available upon request (text and figures
available as ps at ftp://preprint.slac.stanford.edu/preprints/hep-ph/9502/ ) | Phys.Rev.D52:1418-1432,1995 | 10.1103/PhysRevD.52.1418 | SLAC-PUB-6654, LBL-36101, UH-511-804-94 | hep-ph | null | Up to now, almost all discussion of supersymmetry at future colliders has
been concerned with particle searches. However, if candidates for
supersymmetric particles are found, there is much more that we will want to
know about them. Supersymmetry predicts quantitative relations among the
couplings and masses of supersymmetric particles. We discuss the prospects for
testing such relations at a future $e^+e^-$ linear collider, using measurements
that exploit the availability of polarized beams. Precision tests from chargino
production are investigated in two representative cases, and sfermion and
neutralino processes are also discussed.
| [
{
"created": "Thu, 9 Feb 1995 07:17:00 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 1995 07:55:00 GMT",
"version": "v2"
}
] | 2016-09-01 | [
[
"Feng",
"J. L.",
""
],
[
"Murayama",
"H.",
""
],
[
"Peskin",
"M. E.",
""
],
[
"Tata",
"X.",
""
]
] | Up to now, almost all discussion of supersymmetry at future colliders has been concerned with particle searches. However, if candidates for supersymmetric particles are found, there is much more that we will want to know about them. Supersymmetry predicts quantitative relations among the couplings and masses of supersymmetric particles. We discuss the prospects for testing such relations at a future $e^+e^-$ linear collider, using measurements that exploit the availability of polarized beams. Precision tests from chargino production are investigated in two representative cases, and sfermion and neutralino processes are also discussed. |
1802.03174 | Andrew Cheek | D.G. Cerdeno, A. Cheek, E. Reid, and H. Schulz | Surrogate Models for Direct Dark Matter Detection | 35 pages, 19 figures | null | 10.1088/1475-7516/2018/08/011 | IPPP/18/12; DCTP/18/24 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we introduce RAPIDD, a surrogate model that speeds up the
computation of the expected spectrum of dark matter particles in direct
detection experiments. RAPIDD replaces the exact calculation of the dark matter
differential rate (which in general involves up to three nested integrals) with
a much faster parametrization in terms of ordinary polynomials of the dark
matter mass and couplings, obtained in an initial training phase. In this
article, we validate our surrogate model on the multi-dimensional parameter
space resulting from the effective field theory description of dark matter
interactions with nuclei, including also astrophysical uncertainties in the
description of the dark matter halo. As a concrete example, we use this tool to
study the complementarity of different targets to discriminate simplified dark
matter models. We demonstrate that RAPIDD is fast and accurate, and
particularly well-suited to explore a multi-dimensional parameter space, such
as the one in effective field theory approach, and scans with a large number of
evaluations.
| [
{
"created": "Fri, 9 Feb 2018 09:04:12 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2018 16:42:45 GMT",
"version": "v2"
}
] | 2018-09-17 | [
[
"Cerdeno",
"D. G.",
""
],
[
"Cheek",
"A.",
""
],
[
"Reid",
"E.",
""
],
[
"Schulz",
"H.",
""
]
] | In this work we introduce RAPIDD, a surrogate model that speeds up the computation of the expected spectrum of dark matter particles in direct detection experiments. RAPIDD replaces the exact calculation of the dark matter differential rate (which in general involves up to three nested integrals) with a much faster parametrization in terms of ordinary polynomials of the dark matter mass and couplings, obtained in an initial training phase. In this article, we validate our surrogate model on the multi-dimensional parameter space resulting from the effective field theory description of dark matter interactions with nuclei, including also astrophysical uncertainties in the description of the dark matter halo. As a concrete example, we use this tool to study the complementarity of different targets to discriminate simplified dark matter models. We demonstrate that RAPIDD is fast and accurate, and particularly well-suited to explore a multi-dimensional parameter space, such as the one in effective field theory approach, and scans with a large number of evaluations. |
hep-ph/9711447 | Morris L. Swartz | M. L. Swartz (SLAC) | A Complete Order-alpha**3 Calculation of the Cross Section for Polarized
Compton Scattering | 37 pages, RevTeX document, 7 figures. The FORTRAN code comrad.f is
available in gzip-compressed form at
ftp://ftp.slac.stanford.edu/users/morris/comrad.f.gz and
/afs/slac.stanford.edu/public/users/morris/comrad.f.gz. Cosmetically updated
draft (moves some detail into an appendix) | Phys. Rev. D 58, 014010 (1998) | 10.1103/PhysRevD.58.014010 | SLAC-PUB-7701 | hep-ph hep-ex | null | The construction of a computer code to calculate the cross sections for the
spin-polarized processes e-gamma=>e-gamma,e-gamma-gamma,e-e+e- to
order-alpha**3 is described. The code calculates cross sections for
circularly-polarized initial-state photons and arbitrarily polarized
initial-state electrons. The application of the code to the SLD Compton
polarimeter indicates that the order-alpha**3 corrections produce a fractional
shift in the SLC polarization scale of -0.1% which is too small and of the
wrong sign to account for the discrepancy in the Z-pole asymmetries measured by
the SLD Collaboration and the LEP Collaborations.
| [
{
"created": "Mon, 24 Nov 1997 20:30:50 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Mar 1998 20:09:25 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Swartz",
"M. L.",
"",
"SLAC"
]
] | The construction of a computer code to calculate the cross sections for the spin-polarized processes e-gamma=>e-gamma,e-gamma-gamma,e-e+e- to order-alpha**3 is described. The code calculates cross sections for circularly-polarized initial-state photons and arbitrarily polarized initial-state electrons. The application of the code to the SLD Compton polarimeter indicates that the order-alpha**3 corrections produce a fractional shift in the SLC polarization scale of -0.1% which is too small and of the wrong sign to account for the discrepancy in the Z-pole asymmetries measured by the SLD Collaboration and the LEP Collaborations. |
hep-ph/9807548 | Elisabeth Kraus | Elisabeth Kraus (1), Georg Weiglein (2) ((1) Univ. Bonn, (2) Univ.
Karlsruhe) | The Callan-Symanzik equation of the electroweak Standard Model and its
1-loop functions | 39 pages, LaTeX | Nucl.Phys. B551 (1999) 117-154 | 10.1016/S0550-3213(99)00202-3 | Bonn-TH-98-16, KA-TP-12-1998 | hep-ph hep-th | null | We derive the Callan-Symanzik equation of the electroweak Standard Model in
the QED-like on-shell parameterization. The various coefficient functions, the
$\beta$-functions and anomalous dimensions, are determined in one-loop order in
the most general linear gauge compatible with rigid symmetry. In this way the
basic elements for a systematic investigation of higher-order leading
logarithmic contributions in the Standard Model are provided. The one-loop
$\beta$-function of the electromagnetic coupling turns out to be independent of
mass ratios and it is QED-like in this sense. Besides the QED-contributions of
fermions it contains non-abelian contributions from vectors and ghosts with
negative sign, which overcompensate the contributions of the fermions if one
restricts the latter to one fermion generation. We also compare our results
with the symmetric theory and give relations between the $\beta$-functions of
the spontaneously broken and the symmetric theory valid in one-loop order.
| [
{
"created": "Thu, 30 Jul 1998 10:21:15 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kraus",
"Elisabeth",
""
],
[
"Weiglein",
"Georg",
""
]
] | We derive the Callan-Symanzik equation of the electroweak Standard Model in the QED-like on-shell parameterization. The various coefficient functions, the $\beta$-functions and anomalous dimensions, are determined in one-loop order in the most general linear gauge compatible with rigid symmetry. In this way the basic elements for a systematic investigation of higher-order leading logarithmic contributions in the Standard Model are provided. The one-loop $\beta$-function of the electromagnetic coupling turns out to be independent of mass ratios and it is QED-like in this sense. Besides the QED-contributions of fermions it contains non-abelian contributions from vectors and ghosts with negative sign, which overcompensate the contributions of the fermions if one restricts the latter to one fermion generation. We also compare our results with the symmetric theory and give relations between the $\beta$-functions of the spontaneously broken and the symmetric theory valid in one-loop order. |
1408.5694 | Shengqin Feng | Yang Zhong, Chunbin Yang, Xu Cai and Shengqin Feng | A systematic study of magnetic field in Relativistic Heavy-ion
Collisions in the RHIC and LHC energy regions | 8 pages, 7 figures | Advance In High Energy Physics, 2014 (2014), 193039 | 10.1155/2014/193039 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | The features of magnetic field in relativistic heavy-ion collisions are
systematically studied by using a modified magnetic field model in this paper.
The features of magnetic field distributions in the central point are studied
in the RHIC and LHC energy regions. We also predict the feature of magnetic
fields at LHC $\sqrt{s_{NN}}$= 900, 2760 and 7000 GeV based on the detailed
study at RHIC $\sqrt{s_{NN}}$ = 62.4, 130 and 200 GeV. The dependencies of the
features of magnetic fields on the collision energies, centralities and
collision time are systematically investigated, respectively.
| [
{
"created": "Mon, 25 Aug 2014 09:27:50 GMT",
"version": "v1"
}
] | 2014-08-28 | [
[
"Zhong",
"Yang",
""
],
[
"Yang",
"Chunbin",
""
],
[
"Cai",
"Xu",
""
],
[
"Feng",
"Shengqin",
""
]
] | The features of magnetic field in relativistic heavy-ion collisions are systematically studied by using a modified magnetic field model in this paper. The features of magnetic field distributions in the central point are studied in the RHIC and LHC energy regions. We also predict the feature of magnetic fields at LHC $\sqrt{s_{NN}}$= 900, 2760 and 7000 GeV based on the detailed study at RHIC $\sqrt{s_{NN}}$ = 62.4, 130 and 200 GeV. The dependencies of the features of magnetic fields on the collision energies, centralities and collision time are systematically investigated, respectively. |
1712.05401 | Thomas Edwards | Thomas D. P. Edwards and Christoph Weniger | swordfish: Efficient Forecasting of New Physics Searches without Monte
Carlo | 17 pages including appendix, 13 figures | null | null | null | hep-ph physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce swordfish, a Monte-Carlo-free Python package to predict expected
exclusion limits, the discovery reach and expected confidence contours for a
large class of experiments relevant for particle- and astrophysics. The tool is
applicable to any counting experiment, supports general correlated background
uncertainties, and gives exact results in both the signal- and
systematics-limited regimes. Instead of time-intensive Monte Carlo simulations
and likelihood maximization, it internally utilizes new approximation methods
that are built on information geometry. Out of the box, swordfish provides
straightforward methods for accurately deriving many of the common sensitivity
measures. In addition, it allows one to examine experimental abilities in great
detail by employing the notion of information flux. This new concept
generalizes signal-to-noise ratios to situations where background uncertainties
and component mixing cannot be neglected. The user interface of swordfish is
designed with ease-of-use in mind, which we demonstrate by providing typical
examples from indirect and direct dark matter searches as jupyter notebooks.
| [
{
"created": "Thu, 14 Dec 2017 18:59:54 GMT",
"version": "v1"
}
] | 2017-12-15 | [
[
"Edwards",
"Thomas D. P.",
""
],
[
"Weniger",
"Christoph",
""
]
] | We introduce swordfish, a Monte-Carlo-free Python package to predict expected exclusion limits, the discovery reach and expected confidence contours for a large class of experiments relevant for particle- and astrophysics. The tool is applicable to any counting experiment, supports general correlated background uncertainties, and gives exact results in both the signal- and systematics-limited regimes. Instead of time-intensive Monte Carlo simulations and likelihood maximization, it internally utilizes new approximation methods that are built on information geometry. Out of the box, swordfish provides straightforward methods for accurately deriving many of the common sensitivity measures. In addition, it allows one to examine experimental abilities in great detail by employing the notion of information flux. This new concept generalizes signal-to-noise ratios to situations where background uncertainties and component mixing cannot be neglected. The user interface of swordfish is designed with ease-of-use in mind, which we demonstrate by providing typical examples from indirect and direct dark matter searches as jupyter notebooks. |
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