id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0205311 | Piotr Zenczykowski | P. Zenczykowski (Institute of Nuclear Physics, Krakow, Poland) | Connecting nonleptonic and weak radiative hyperon decays | 12 LaTeX pages, 1 .ps figure | Acta Phys.Polon. B34 (2003) 2683-2692 | null | null | hep-ph | null | Using the recent measurement of the $\Xi ^0 \to \Lambda \gamma $ asymmetry as
an input, we reanalyse nonleptonic and weak radiative hyperon decays in a
single symmetry-based framework. In this framework the old S:P problem of
nonleptonic decays is automatically resolved when the most important features
of weak radiative decays are taken into account. Experimental data require that
symmetry between the two types of hyperon decays be imposed at the level of
currents, not fields. Previously established connections between hyperon decays
and nuclear parity violation imply that the conflict, originally suggested by
weak radiative decays, has to surface somewhere.
| [
{
"created": "Tue, 28 May 2002 12:06:45 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2002 10:15:57 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jul 2002 09:41:37 GMT",
"version": "v3"
},
{
"created": "Fri, 4 Oct 2002 09:20:03 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Zenczykowski",
"P.",
"",
"Institute of Nuclear Physics, Krakow, Poland"
]
] | Using the recent measurement of the $\Xi ^0 \to \Lambda \gamma $ asymmetry as an input, we reanalyse nonleptonic and weak radiative hyperon decays in a single symmetry-based framework. In this framework the old S:P problem of nonleptonic decays is automatically resolved when the most important features of weak radiative decays are taken into account. Experimental data require that symmetry between the two types of hyperon decays be imposed at the level of currents, not fields. Previously established connections between hyperon decays and nuclear parity violation imply that the conflict, originally suggested by weak radiative decays, has to surface somewhere. |
2311.13635 | Peter Krack | Arman Korajac, Peter Krack, Nudzeim Selimovic | Third-Family Lepton-Quark Fusion | 11 pages, 7 figures, Monte Carlo generator can be downloaded from
https://github.com/peterkrack/3rd-Lepton-Quark-Fusion v2: version accepted
for publication in EPJC | null | 10.1140/epjc/s10052-024-12618-8 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We analyze the signatures of new physics scenarios featuring third-family
quark-lepton unification at the TeV scale in lepton-quark fusion at hadron
colliders. Working with complete UV dynamics based on the $SU(4)$ gauge
symmetry in the third-family fermions, we simulate the resonant production of a
vector leptoquark at the next-to-leading order, including its decay and
matching to the parton showers. The precise theoretical control over this
production channel allows us to set robust bounds on the vector leptoquark
parameter space which are complementary to the other production channels at
colliders. We emphasize the importance of the resonant channel in future
searches and discuss the impact of variations in the model space depending on
the flavor structure of the vector leptoquark couplings.
| [
{
"created": "Wed, 22 Nov 2023 19:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jun 2024 13:35:32 GMT",
"version": "v2"
}
] | 2024-06-04 | [
[
"Korajac",
"Arman",
""
],
[
"Krack",
"Peter",
""
],
[
"Selimovic",
"Nudzeim",
""
]
] | We analyze the signatures of new physics scenarios featuring third-family quark-lepton unification at the TeV scale in lepton-quark fusion at hadron colliders. Working with complete UV dynamics based on the $SU(4)$ gauge symmetry in the third-family fermions, we simulate the resonant production of a vector leptoquark at the next-to-leading order, including its decay and matching to the parton showers. The precise theoretical control over this production channel allows us to set robust bounds on the vector leptoquark parameter space which are complementary to the other production channels at colliders. We emphasize the importance of the resonant channel in future searches and discuss the impact of variations in the model space depending on the flavor structure of the vector leptoquark couplings. |
2202.13063 | Shuntaro Aoki | Shuntaro Aoki, Hyun Min Lee, Adriana G. Menkara, and Kimiko Yamashita | Reheating and Dark Matter Freeze-in in the Higgs-$R^2$ Inflation Model | 39 pages,7 figures; v2 Published version in JHEP | null | 10.1007/JHEP05(2022)121 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the post-inflationary dynamics for reheating and freeze-in dark
matter in the Higgs-$R^2$ inflation model. Taking the perturbative approach for
reheating, we determine the evolution of the temperature for radiation bath
produced during reheating and determine the maximum and reheating temperatures
of the Universe. Adopting a singlet scalar dark matter with a conformal
non-minimal coupling and a vanishing Higgs-portal coupling, we discuss the
freeze-in production of dark matter both from the non-thermal scattering during
reheating and the thermal scattering after reheating. We find that thermal
scattering is dominant for dark matter production in our model due to the high
reheating temperature. The reheating temperature in our model is determined
dominantly by the Higgs condensate to be up to about $10^{14}\,{\rm GeV}$ and
dark matter with masses up to about $10^9\,{\rm GeV}$ can be produced with a
correct relic density.
| [
{
"created": "Sat, 26 Feb 2022 05:17:45 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Apr 2022 13:52:10 GMT",
"version": "v2"
}
] | 2022-06-08 | [
[
"Aoki",
"Shuntaro",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Menkara",
"Adriana G.",
""
],
[
"Yamashita",
"Kimiko",
""
]
] | We study the post-inflationary dynamics for reheating and freeze-in dark matter in the Higgs-$R^2$ inflation model. Taking the perturbative approach for reheating, we determine the evolution of the temperature for radiation bath produced during reheating and determine the maximum and reheating temperatures of the Universe. Adopting a singlet scalar dark matter with a conformal non-minimal coupling and a vanishing Higgs-portal coupling, we discuss the freeze-in production of dark matter both from the non-thermal scattering during reheating and the thermal scattering after reheating. We find that thermal scattering is dominant for dark matter production in our model due to the high reheating temperature. The reheating temperature in our model is determined dominantly by the Higgs condensate to be up to about $10^{14}\,{\rm GeV}$ and dark matter with masses up to about $10^9\,{\rm GeV}$ can be produced with a correct relic density. |
hep-ph/0109271 | Ryutin Roman | A. V. Kisselev, V. A. Petrov, R. A. Ryutin | Do Quark Mass Effects Survive in the High-$Q^2$ Limit of DIS? | 11 pages, 3 figures; content is corrected. To be published in Eur.
Phys. Journal C | Eur.Phys.J.C26:597-600,2003 | 10.1140/epjc/s2002-01077-2 | null | hep-ph | null | Quark mass effects are analyzed at high $Q^2$ in the current fragmentation
region of DIS. It is found that the linear combination $F_2-2.75F^c_2$ scales
at large $Q^2$ and small $x$. We obtained a lower bound for the ratio
$F^c_2/F_2$ which lies very close to the data from HERA.
| [
{
"created": "Thu, 27 Sep 2001 16:37:38 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2001 07:35:17 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Aug 2002 07:32:59 GMT",
"version": "v3"
}
] | 2011-09-13 | [
[
"Kisselev",
"A. V.",
""
],
[
"Petrov",
"V. A.",
""
],
[
"Ryutin",
"R. A.",
""
]
] | Quark mass effects are analyzed at high $Q^2$ in the current fragmentation region of DIS. It is found that the linear combination $F_2-2.75F^c_2$ scales at large $Q^2$ and small $x$. We obtained a lower bound for the ratio $F^c_2/F_2$ which lies very close to the data from HERA. |
1905.10918 | Dennis E. Krause | D. E. Krause and Q. Le Thien | The 2-Neutrino Exchange Potential with Mixing: A Probe of Neutrino
Physics and CP Violation | 4 pages; presented at the Eighth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, May 12-16, 2019 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 2-neutrino exchange potential is a Standard Model weak potential arising
from the exchange of virtual neutrino-antineutrino pairs which must include all
neutrino properties, including the number of flavors, their masses, fermionic
nature (Dirac or Majorana), and CP violation. We describe a new approach for
calculating the spin-independent 2-neutrino exchange potential, including the
mixing of three neutrino mass states and CP violation.
| [
{
"created": "Mon, 27 May 2019 01:19:08 GMT",
"version": "v1"
}
] | 2019-05-28 | [
[
"Krause",
"D. E.",
""
],
[
"Thien",
"Q. Le",
""
]
] | The 2-neutrino exchange potential is a Standard Model weak potential arising from the exchange of virtual neutrino-antineutrino pairs which must include all neutrino properties, including the number of flavors, their masses, fermionic nature (Dirac or Majorana), and CP violation. We describe a new approach for calculating the spin-independent 2-neutrino exchange potential, including the mixing of three neutrino mass states and CP violation. |
1707.08155 | Jordi Salvado | Gabriela Barenboim, Jordi Salvado | Cosmology and CPT violating neutrinos | 5 pages, 6 figures | null | 10.1140/epjc/s10052-017-5347-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The combination Charge Conjugation-Parity-Time Reversal(CPT) is a fundamental
symmetry in our current understanding of nature. As such, testing CPT violation
is a strongly motivated path to explore new physics. In this paper we study CPT
violation in the neutrino sector, giving for the first time a bound, for a
fundamental particle, in the CPT violating particle-antiparticle gravitational
mass difference. We argue that cosmology is nowadays the only data sensitive to
CPT violation for the neutrino-antineutrino mass splitting and we use the
latest data release from Planck combined with the current
Baryonic-Acoustic-Oscillation measurement to perform a full cosmological
analysis. To show the potential of the future experiments we also show the
results for Euclid, a next generation large scale structure experiment.
| [
{
"created": "Tue, 25 Jul 2017 19:04:19 GMT",
"version": "v1"
}
] | 2017-12-06 | [
[
"Barenboim",
"Gabriela",
""
],
[
"Salvado",
"Jordi",
""
]
] | The combination Charge Conjugation-Parity-Time Reversal(CPT) is a fundamental symmetry in our current understanding of nature. As such, testing CPT violation is a strongly motivated path to explore new physics. In this paper we study CPT violation in the neutrino sector, giving for the first time a bound, for a fundamental particle, in the CPT violating particle-antiparticle gravitational mass difference. We argue that cosmology is nowadays the only data sensitive to CPT violation for the neutrino-antineutrino mass splitting and we use the latest data release from Planck combined with the current Baryonic-Acoustic-Oscillation measurement to perform a full cosmological analysis. To show the potential of the future experiments we also show the results for Euclid, a next generation large scale structure experiment. |
hep-ph/0210161 | Bernd Andreas Kniehl | Bernd A. Kniehl, Alexander A. Penin, Vladimir A. Smirnov, Matthias
Steinhauser | Heavy-quarkonium creation and annihilation with O(alpha_s^3 ln(alpha_s))
accuracy | 10 pages (Latex). Eq. (6) corrected, conclusions unchanged | Phys.Rev.Lett. 90 (2003) 212001 | 10.1103/PhysRevLett.90.212001 | DESY 02-134 | hep-ph | null | We calculate the O(alpha_s^3 ln(alpha_s)) contributions to the
heavy-quarkonium production and annihilation rates. Our result sheds new light
on the structure of the high-order perturbative corrections and opens a new
perspective for a high-precision theoretical analysis. We also determine the
three-loop anomalous dimensions of the nonrelativistic vector and pseudoscalar
currents.
| [
{
"created": "Thu, 10 Oct 2002 11:44:01 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Apr 2003 15:07:05 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Aug 2003 15:47:25 GMT",
"version": "v3"
},
{
"created": "Fri, 8 Aug 2003 09:44:12 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Kniehl",
"Bernd A.",
""
],
[
"Penin",
"Alexander A.",
""
],
[
"Smirnov",
"Vladimir A.",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | We calculate the O(alpha_s^3 ln(alpha_s)) contributions to the heavy-quarkonium production and annihilation rates. Our result sheds new light on the structure of the high-order perturbative corrections and opens a new perspective for a high-precision theoretical analysis. We also determine the three-loop anomalous dimensions of the nonrelativistic vector and pseudoscalar currents. |
hep-ph/0112057 | null | M. Salle, J. Smit and J.C. Vink | Initial conditions for simulated `tachyonic preheating' and the Hartree
ensemble approximation | 7 pages, talk presented at COSMO-01, Rovaniemi, Finland | null | null | null | hep-ph | null | In numerical simulations studying preheating in the classical approximation
there is the problem how to derive the classical initial conditions from the
quantum vacuum fluctuations. In past treatments, the initial conditions often
put an energy density into the classical field of order of the cutoff, leading
to a divergent temperature after thermalization. We suggest a solution to the
problem which follows naturally from a Hartree ensemble approximation,
introduced recently as an improvement over the standard Hartree approximation.
We study the effects on particle numbers of the various treatments, within the
context of `tachyonic preheating' in 1+1 dimensional $\phi^4$ theory.
| [
{
"created": "Tue, 4 Dec 2001 17:40:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Salle",
"M.",
""
],
[
"Smit",
"J.",
""
],
[
"Vink",
"J. C.",
""
]
] | In numerical simulations studying preheating in the classical approximation there is the problem how to derive the classical initial conditions from the quantum vacuum fluctuations. In past treatments, the initial conditions often put an energy density into the classical field of order of the cutoff, leading to a divergent temperature after thermalization. We suggest a solution to the problem which follows naturally from a Hartree ensemble approximation, introduced recently as an improvement over the standard Hartree approximation. We study the effects on particle numbers of the various treatments, within the context of `tachyonic preheating' in 1+1 dimensional $\phi^4$ theory. |
hep-ph/9905452 | B. F. L. Ward | S. Jadach (1 and 2), B.F.L. Ward (3 and 4) and Z. Was (1 and 2) ((1)
CERN, Theory Division, Geneva, Switzerland, (2) Institute of Nuclear Physics,
Krakow, Poland, (3) Department of Physics and Astronomy, The University of
Tennessee, Knoxville, TN, USA, (4) SLAC, Stanford University, Stanford, CA,
USA) | Global Positioning of Spin GPS Scheme for Half-Spin Massive Spinors | 13 pages, 1 eps figure | Eur.Phys.J.C22:423-430,2001 | 10.1007/s100520100818 | CERN-TH-98-235, UTHEP-98-0701 | hep-ph | null | We present a simple and flexible method of keeping track of the complex
phases and spin quantization axes for half-spin initial- and final-state Weyl
spinors in scattering amplitudes of Standard Model high energy physics
processes. Both cases of massless and massive spinors are discussed. The method
is demonstrated and checked numerically for spin correlations in tau tau-bar
production and decay. Its main application will be in the forthcoming work of
combining effects due to multiple photon emission (exponentiation) and spin,
embodied in the Monte Carlo event generators for production and decay of
unstable fermions such as the tau lepton, t-quark and hypothetical new heavy
particles.
| [
{
"created": "Sat, 22 May 1999 20:49:48 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Jadach",
"S.",
"",
"1 and 2"
],
[
"Ward",
"B. F. L.",
"",
"3 and 4"
],
[
"Was",
"Z.",
"",
"1 and 2"
]
] | We present a simple and flexible method of keeping track of the complex phases and spin quantization axes for half-spin initial- and final-state Weyl spinors in scattering amplitudes of Standard Model high energy physics processes. Both cases of massless and massive spinors are discussed. The method is demonstrated and checked numerically for spin correlations in tau tau-bar production and decay. Its main application will be in the forthcoming work of combining effects due to multiple photon emission (exponentiation) and spin, embodied in the Monte Carlo event generators for production and decay of unstable fermions such as the tau lepton, t-quark and hypothetical new heavy particles. |
hep-ph/0103266 | Zuo-tang Liang | Zuo-tang Liang and Chun-xiu Liu | Spin transfer in high energy fragmentation processes | Talk given at the 14th International Spin Symposium, 5 pages | null | null | null | hep-ph | null | We point out that measuring longitudinal polarizations of different hyperons
produced in lepton induced reactions are ideal to study the spin transfer of
the fragtmenting quark to produced hadron in high energy hadronization
processes. We briefly summarize the method used in calculating the hyperon
polarizations in these processes, then present some of the results for e+e- and
e-p or \nu p reactions obtained using two different pictures for the spin
structure of hyperon: that drawn from polarized deep inelastic lepton-nucleon
scattering data or that using SU(6) symmetric wave functions. The results show
in particular that measurements of such polarizations should provide useful
information to the question of which picture is more suitable in describing the
spin effects in the fragmentation processes.
| [
{
"created": "Sun, 25 Mar 2001 03:34:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Liang",
"Zuo-tang",
""
],
[
"Liu",
"Chun-xiu",
""
]
] | We point out that measuring longitudinal polarizations of different hyperons produced in lepton induced reactions are ideal to study the spin transfer of the fragtmenting quark to produced hadron in high energy hadronization processes. We briefly summarize the method used in calculating the hyperon polarizations in these processes, then present some of the results for e+e- and e-p or \nu p reactions obtained using two different pictures for the spin structure of hyperon: that drawn from polarized deep inelastic lepton-nucleon scattering data or that using SU(6) symmetric wave functions. The results show in particular that measurements of such polarizations should provide useful information to the question of which picture is more suitable in describing the spin effects in the fragmentation processes. |
hep-ph/0507172 | Fei Wang | Fei Wang, Wenyu Wang, Jin Min Yang | Gravitino dark matter from gluino late decay in split supersymmetry | discussions added (version in PRD) | Phys.Rev. D72 (2005) 077701 | 10.1103/PhysRevD.72.077701 | null | hep-ph | null | In split-supersymmetry (split-SUSY), gluino is a metastable particle and thus
can freeze out in the early universe. The late decay of such a long-life gluino
into the lightest supersymmetric particle (LSP) may provide much of the cosmic
dark matter content. In this work, assuming the LSP is gravitino produced from
the late decay of the metastable gluino, we examine the WMAP dark matter
constraints on the gluino mass. We find that to provide the full abundance of
dark matter, the gluino must be heavier than about 14 TeV and thus not
accessible at the CERN Large Hadron Collider (LHC).
| [
{
"created": "Thu, 14 Jul 2005 12:43:40 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Oct 2005 13:20:00 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Wang",
"Fei",
""
],
[
"Wang",
"Wenyu",
""
],
[
"Yang",
"Jin Min",
""
]
] | In split-supersymmetry (split-SUSY), gluino is a metastable particle and thus can freeze out in the early universe. The late decay of such a long-life gluino into the lightest supersymmetric particle (LSP) may provide much of the cosmic dark matter content. In this work, assuming the LSP is gravitino produced from the late decay of the metastable gluino, we examine the WMAP dark matter constraints on the gluino mass. We find that to provide the full abundance of dark matter, the gluino must be heavier than about 14 TeV and thus not accessible at the CERN Large Hadron Collider (LHC). |
0712.1453 | Julia Garayoa | Julia Garayoa (Valencia U. and Valencia U.-IFIC), Thomas Schwetz
(CERN) | Neutrino mass hierarchy and Majorana CP phases within the Higgs triplet
model at the LHC | 22 pages, 6 figures. Version to be published at JHEP | JHEP 0803:009,2008 | 10.1088/1126-6708/2008/03/009 | CERN-PH-TH/2007-255, IFIC/07-75, FTUV-07-1210 | hep-ph | null | Neutrino masses may be generated by the VEV of an $SU(2)_L$ Higgs triplet. We
assume that the doubly charged component of such a triplet has a mass in the
range of several 100 GeV, such that it is accessible at LHC. Its decay into
like-sign leptons provides a clean experimental signature, which allows for a
direct test of the neutrino mass matrix. By exploring the branching ratios of
this decay into leptons of various flavours, we show that within this model the
type of the neutrino mass spectrum (normal, inverted or quasi-degenerate) might
actually be resolved at the LHC. Furthermore, we show that within the Higgs
triplet model for neutrino mass the decays of the doubly charged scalar into
like-sign lepton pairs at the LHC provide a possibility to determine the
Majorana CP phases of the lepton mixing matrix.
| [
{
"created": "Mon, 10 Dec 2007 13:59:54 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Feb 2008 14:04:11 GMT",
"version": "v2"
}
] | 2009-01-06 | [
[
"Garayoa",
"Julia",
"",
"Valencia U. and Valencia U.-IFIC"
],
[
"Schwetz",
"Thomas",
"",
"CERN"
]
] | Neutrino masses may be generated by the VEV of an $SU(2)_L$ Higgs triplet. We assume that the doubly charged component of such a triplet has a mass in the range of several 100 GeV, such that it is accessible at LHC. Its decay into like-sign leptons provides a clean experimental signature, which allows for a direct test of the neutrino mass matrix. By exploring the branching ratios of this decay into leptons of various flavours, we show that within this model the type of the neutrino mass spectrum (normal, inverted or quasi-degenerate) might actually be resolved at the LHC. Furthermore, we show that within the Higgs triplet model for neutrino mass the decays of the doubly charged scalar into like-sign lepton pairs at the LHC provide a possibility to determine the Majorana CP phases of the lepton mixing matrix. |
hep-ph/0612185 | Dumitru Ghilencea | D. M. Ghilencea | Threshold effects near the compactification scale for gauge couplings on
orbifolds | 18 pages, 4 figures; improved presentation | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 6D orbifold compactifications of N=1 supersymmetric gauge theories, the
one-loop behaviour of the 4D {\it effective} gauge coupling and of its beta
function are carefully investigated for momentum scales k^2 near the
compactification scale(s). It is showed that as k^2 is crossing the
compactification scale(s), there exists a smooth transition ("crossover") to a
power-like behaviour of the 4D effective coupling, with a continuous one-loop
beta function. Contrary to the naive expectation, the power-like behaviour sets
in at momentum scales {\it smaller} than the compactification scale, to suggest
a {\it global} effect of the Kaluza-Klein modes even below this scale. We argue
that the experimental observation of such behaviour is not necessarily a
quantum effect of the compactification, as often thought, and is dominated by
classical effects. Special attention is paid to convergence issues near
compactification scale(s) and to the scheme dependence of the results.
| [
{
"created": "Fri, 15 Dec 2006 00:02:58 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Feb 2009 22:45:59 GMT",
"version": "v2"
}
] | 2009-02-03 | [
[
"Ghilencea",
"D. M.",
""
]
] | In 6D orbifold compactifications of N=1 supersymmetric gauge theories, the one-loop behaviour of the 4D {\it effective} gauge coupling and of its beta function are carefully investigated for momentum scales k^2 near the compactification scale(s). It is showed that as k^2 is crossing the compactification scale(s), there exists a smooth transition ("crossover") to a power-like behaviour of the 4D effective coupling, with a continuous one-loop beta function. Contrary to the naive expectation, the power-like behaviour sets in at momentum scales {\it smaller} than the compactification scale, to suggest a {\it global} effect of the Kaluza-Klein modes even below this scale. We argue that the experimental observation of such behaviour is not necessarily a quantum effect of the compactification, as often thought, and is dominated by classical effects. Special attention is paid to convergence issues near compactification scale(s) and to the scheme dependence of the results. |
0905.3711 | Joern Kersten | Joern Kersten, Oleg Lebedev | Gravitino Dark Matter in Gravity Mediation | 10 pages, 3 PDF figures | Phys.Lett.B678:481-484,2009 | 10.1016/j.physletb.2009.06.062 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study general conditions for the gravitino to be the lightest
supersymmetric particle (LSP) in models with gravity mediated supersymmetry
breaking. We find that the decisive quantities are the Kaehler potential K and
the gauge kinetic function f. In constrained MSSM (CMSSM) type models, the
gravitino LSP occurs if the gaugino mass at the GUT scale is greater than
approximately 2.5 gravitino masses. This translates into \sqrt{K"}/f' < 0.2,
where the derivatives are taken with respect to the dominant SUSY breaking
field. This requirement can easily be satisfied in string-motivated setups.
| [
{
"created": "Fri, 22 May 2009 15:50:05 GMT",
"version": "v1"
}
] | 2010-05-28 | [
[
"Kersten",
"Joern",
""
],
[
"Lebedev",
"Oleg",
""
]
] | We study general conditions for the gravitino to be the lightest supersymmetric particle (LSP) in models with gravity mediated supersymmetry breaking. We find that the decisive quantities are the Kaehler potential K and the gauge kinetic function f. In constrained MSSM (CMSSM) type models, the gravitino LSP occurs if the gaugino mass at the GUT scale is greater than approximately 2.5 gravitino masses. This translates into \sqrt{K"}/f' < 0.2, where the derivatives are taken with respect to the dominant SUSY breaking field. This requirement can easily be satisfied in string-motivated setups. |
2312.12322 | Vicky Singh Thounaojam Mr. | Satyabrata Mahapatra, Sujit Kumar Sahoo, Narendra Sahu, Vicky Singh
Thounaojam | Self Interacting Dark Matter and Dirac neutrinos via Lepton Quarticity | 13 pages, 13 captioned figures, accepted for publication in Phys.
Rev. D | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we put forward a connection between the self-interacting dark
matter and the Dirac nature of neutrinos. Our exploration involves a $Z_4
\otimes Z_4'$ discrete symmetry, wherein the Dirac neutrino mass is produced
through a type-I seesaw mechanism. This symmetry not only contributes to the
generation of the Dirac neutrino mass but also facilitates the realization of
self-interacting dark matter with a light mediator that can alleviate
small-scale anomalies of the $\Lambda {\rm CDM}$ while being consistent with
the latter at large scales, as suggested by astrophysical observations. Thus
the stability of the DM and Dirac nature of neutrinos are shown to stem from
the same underlying symmetry. The model also features additional relativistic
degrees of freedom $\Delta N_{\rm eff}$ of either thermal or non-thermal
origin, within the reach of cosmic microwave background (CMB) experiment
providing a complementary probe in addition to the detection prospects of DM.
| [
{
"created": "Tue, 19 Dec 2023 16:51:32 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2024 05:55:21 GMT",
"version": "v2"
}
] | 2024-03-05 | [
[
"Mahapatra",
"Satyabrata",
""
],
[
"Sahoo",
"Sujit Kumar",
""
],
[
"Sahu",
"Narendra",
""
],
[
"Thounaojam",
"Vicky Singh",
""
]
] | In this paper, we put forward a connection between the self-interacting dark matter and the Dirac nature of neutrinos. Our exploration involves a $Z_4 \otimes Z_4'$ discrete symmetry, wherein the Dirac neutrino mass is produced through a type-I seesaw mechanism. This symmetry not only contributes to the generation of the Dirac neutrino mass but also facilitates the realization of self-interacting dark matter with a light mediator that can alleviate small-scale anomalies of the $\Lambda {\rm CDM}$ while being consistent with the latter at large scales, as suggested by astrophysical observations. Thus the stability of the DM and Dirac nature of neutrinos are shown to stem from the same underlying symmetry. The model also features additional relativistic degrees of freedom $\Delta N_{\rm eff}$ of either thermal or non-thermal origin, within the reach of cosmic microwave background (CMB) experiment providing a complementary probe in addition to the detection prospects of DM. |
hep-ph/0510001 | Tetsuya Shinozaki | Tetsuya Shinozaki, Makoto Oka, Sachiko Takeuchi | P-wave Pentaquark and its Decay in the Quark Model with Instanton
Induced Interaction | 9 pages, 5 figures | Phys.Rev.D74:054029,2006 | 10.1103/PhysRevD.74.054029 | null | hep-ph | null | P-wave pentaquarks with strangeness +1, I=0 and J^P=1/2^+ are studied in the
non-relativistic quark model with instanton induced interaction (III). We
present their mass splittings and orbital-spin-isospin-color structures. It is
found that decompositions of the wave functions are sensitive to III, while the
mass splittings are insensitive. The decay of the lowest energy pentaquark,
\Theta^+, is found to be suppressed when the contribution of III is increased.
Its wave function is dominated by Jaffe-Wilczek-type configuration at large
III.
| [
{
"created": "Fri, 30 Sep 2005 18:39:07 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Shinozaki",
"Tetsuya",
""
],
[
"Oka",
"Makoto",
""
],
[
"Takeuchi",
"Sachiko",
""
]
] | P-wave pentaquarks with strangeness +1, I=0 and J^P=1/2^+ are studied in the non-relativistic quark model with instanton induced interaction (III). We present their mass splittings and orbital-spin-isospin-color structures. It is found that decompositions of the wave functions are sensitive to III, while the mass splittings are insensitive. The decay of the lowest energy pentaquark, \Theta^+, is found to be suppressed when the contribution of III is increased. Its wave function is dominated by Jaffe-Wilczek-type configuration at large III. |
hep-ph/0107051 | Kazuo Koike | K. Koike | Generation Structure and Proton Decay Problem | 9 pages | Prog.Theor.Phys. 106 (2001) 963-970 | 10.1143/PTP.106.963 | Kagawa-17 | hep-ph | null | Possible generation structure is investigated. We considere alternative
possibility of combination of leptons and quarks to compose each generation,
where the combination of $(\nu_{\tau},{\tau})$ and $(u,d)$ compose a
generation. Our model exhibits the hierarcy structure after sea-saw mechanism
provived that possible existence of realistic right-handed neutrinos are taken
into account. Then, in the GUTs model based on our scheme, possible
inter-generation properties are examined together with the classification of
gauge bosons. It is shown that if our scheme is realized, the proton decay
exhibits different mode from ordinary one.
| [
{
"created": "Thu, 5 Jul 2001 15:46:09 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Koike",
"K.",
""
]
] | Possible generation structure is investigated. We considere alternative possibility of combination of leptons and quarks to compose each generation, where the combination of $(\nu_{\tau},{\tau})$ and $(u,d)$ compose a generation. Our model exhibits the hierarcy structure after sea-saw mechanism provived that possible existence of realistic right-handed neutrinos are taken into account. Then, in the GUTs model based on our scheme, possible inter-generation properties are examined together with the classification of gauge bosons. It is shown that if our scheme is realized, the proton decay exhibits different mode from ordinary one. |
1610.00447 | Nejc Ko\v{s}nik | Nejc Kosnik | New physics facing LFU and LFV tests in B physics | 9 pages, 2 figures, Proceedings for the LHCP Conference, Lund, June
2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lepton flavor universality in the Standard Model and hints of its violation
in neutral ($R_K$) and charged currents $(R_{D^{(*)}})$ in $B$ decays are
presented. We discuss model independent features as well as several leptoquark
scenarios which are well suited to fit current values of $R_K$ and/or
$R_{D^{(*)}}$.
| [
{
"created": "Mon, 3 Oct 2016 08:57:00 GMT",
"version": "v1"
}
] | 2016-10-04 | [
[
"Kosnik",
"Nejc",
""
]
] | Lepton flavor universality in the Standard Model and hints of its violation in neutral ($R_K$) and charged currents $(R_{D^{(*)}})$ in $B$ decays are presented. We discuss model independent features as well as several leptoquark scenarios which are well suited to fit current values of $R_K$ and/or $R_{D^{(*)}}$. |
1205.2372 | David Sanford | Jonathan L. Feng, David Sanford | A Natural 125 GeV Higgs Boson in the MSSM from Focus Point Supersymmetry
with A-Terms | 18 pages, 8 figures | null | 10.1103/PhysRevD.86.055015 | UCI-TR-2012-12 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a 125 GeV Higgs boson and percent-level fine-tuning are
simultaneously attainable in the MSSM, with no additional fields and
supersymmetry breaking generated at the GUT scale. The Higgs mass is raised by
large radiative contributions from top squarks with significant left-right
mixing, and naturalness is preserved by the focus point mechanism with large
$A$-terms, which suppresses large log-enhanced sensitivities to variations in
the fundamental parameters. The focus point mechanism is independent of almost
all supersymmetry-breaking parameters, but is predictive in the top sector,
requiring the GUT-scale relation $m_{H_u}^2 : m_{\bar{U}_3}^2 : m_{Q_3}^2 :
A_t^2 = 1 : 1+x - 3y : 1-x : 9y$, where $x$ and $y$ are constants. We derive
this condition analytically and then investigate three representative models
through detailed numerical analysis. The models generically predict heavy
superpartners, but dark matter searches in the case of non-unified gaugino
masses are promising, as are searches for top squarks and gluinos with top and
bottom-rich cascade decays at the LHC. This framework may be viewed as a simple
update to mSUGRA/CMSSM to accommodate both naturalness and current Higgs boson
constraints, and provides an ideal framework for presenting new results from
LHC searches.
| [
{
"created": "Thu, 10 May 2012 20:00:04 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Feng",
"Jonathan L.",
""
],
[
"Sanford",
"David",
""
]
] | We show that a 125 GeV Higgs boson and percent-level fine-tuning are simultaneously attainable in the MSSM, with no additional fields and supersymmetry breaking generated at the GUT scale. The Higgs mass is raised by large radiative contributions from top squarks with significant left-right mixing, and naturalness is preserved by the focus point mechanism with large $A$-terms, which suppresses large log-enhanced sensitivities to variations in the fundamental parameters. The focus point mechanism is independent of almost all supersymmetry-breaking parameters, but is predictive in the top sector, requiring the GUT-scale relation $m_{H_u}^2 : m_{\bar{U}_3}^2 : m_{Q_3}^2 : A_t^2 = 1 : 1+x - 3y : 1-x : 9y$, where $x$ and $y$ are constants. We derive this condition analytically and then investigate three representative models through detailed numerical analysis. The models generically predict heavy superpartners, but dark matter searches in the case of non-unified gaugino masses are promising, as are searches for top squarks and gluinos with top and bottom-rich cascade decays at the LHC. This framework may be viewed as a simple update to mSUGRA/CMSSM to accommodate both naturalness and current Higgs boson constraints, and provides an ideal framework for presenting new results from LHC searches. |
hep-ph/9906425 | Dario Sassi Thober | Dario Sassi Thober | The definition of a magnetic monopole in Electrodynamics combined with
Gravitation | 11 pages | null | null | CPTUS-06/1999 | hep-ph | null | It is discussed the singular string associated to the gauge field of
monopoles must be a physical observable if the monopole charge is different
from zero. It is naturally found that if the gauge is to be an observable, it
is possibly connected to gravity.
| [
{
"created": "Thu, 17 Jun 1999 23:35:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thober",
"Dario Sassi",
""
]
] | It is discussed the singular string associated to the gauge field of monopoles must be a physical observable if the monopole charge is different from zero. It is naturally found that if the gauge is to be an observable, it is possibly connected to gravity. |
hep-ph/0411064 | Dmitri Kazakov | D.I.Kazakov | Beyond The Standard Model | 52 pages, 51 eps figures, Lectures given at the European School on
High Energy Physics, May-June 2004, Sant Feliu de Guixols, Spain | null | null | null | hep-ph | null | The present lectures contain an introduction to possible new physics beyond
the Standard Model. Having in mind first of all accelerator experiments of the
nearest future we concentrate on supersymmetry, a new symmetry that relates
bosons and fermions, as the first target of experimental search. Since
supersymmetry is widely covered in the literature, we mostly consider novel
developments and applications to hadron colliders. We describe then the
so-called extra dimensional models in less detail and discuss their possible
manifestations.
| [
{
"created": "Thu, 4 Nov 2004 14:41:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kazakov",
"D. I.",
""
]
] | The present lectures contain an introduction to possible new physics beyond the Standard Model. Having in mind first of all accelerator experiments of the nearest future we concentrate on supersymmetry, a new symmetry that relates bosons and fermions, as the first target of experimental search. Since supersymmetry is widely covered in the literature, we mostly consider novel developments and applications to hadron colliders. We describe then the so-called extra dimensional models in less detail and discuss their possible manifestations. |
hep-ph/0503149 | Seung-Il Nam | Seung-Il Nam (RCNP, Osaka University, Japan and Department of Physics
& NuRI, Pusan National University, Republic of Korea), Atsushi Hosaka (RCNP,
Osaka University, Japan) and Hyun-Chul Kim (Department of Physics & NuRI,
Pusan National University, Republic of Korea) | Lambda(1520,3/2^-) photoproduction reaction via gamma N -> K
Lambda(1520) | 16 pages, 31 figures | Phys.Rev.D71:114012,2005 | 10.1103/PhysRevD.71.114012 | PNU-NTG-6/2005 | hep-ph | null | We investigate Lambda(1520,3/2^-,D_03) photoproduction via the gamma N -> K
Lambda^* reaction process. Using effective Lagrangians, we compute the total
and differential cross sections as well as the dependence on the momentum
transfer for the photoproduction at the tree-level. We employ two different
form factors: The four-dimensional gauge-invariant type and the three
dimensional one depending on the external momenta. We find that the total cross
sections for the proton target are well reproduced as compared with the
experimental data. It turns out that the total cross sections for the neutron
target are significantly smaller than those for the proton target. We also
compare the present results with the gamma N -> bar{K} Theta^+ reaction in
order to extract information of Theta^+. Finally the role of K^*--exchange in
the production reaction is discussed.
| [
{
"created": "Wed, 16 Mar 2005 02:12:54 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jul 2005 07:34:29 GMT",
"version": "v2"
}
] | 2009-12-17 | [
[
"Nam",
"Seung-Il",
"",
"RCNP, Osaka University, Japan and Department of Physics\n & NuRI, Pusan National University, Republic of Korea"
],
[
"Hosaka",
"Atsushi",
"",
"RCNP,\n Osaka University, Japan"
],
[
"Kim",
"Hyun-Chul",
"",
"Department of Physics & Nu... | We investigate Lambda(1520,3/2^-,D_03) photoproduction via the gamma N -> K Lambda^* reaction process. Using effective Lagrangians, we compute the total and differential cross sections as well as the dependence on the momentum transfer for the photoproduction at the tree-level. We employ two different form factors: The four-dimensional gauge-invariant type and the three dimensional one depending on the external momenta. We find that the total cross sections for the proton target are well reproduced as compared with the experimental data. It turns out that the total cross sections for the neutron target are significantly smaller than those for the proton target. We also compare the present results with the gamma N -> bar{K} Theta^+ reaction in order to extract information of Theta^+. Finally the role of K^*--exchange in the production reaction is discussed. |
2012.06566 | Fabrizio Rompineve | Ricardo Z. Ferreira, Alessio Notari, Fabrizio Rompineve | The DFSZ axion in the CMB | 14 pages, 10 figures | Phys. Rev. D 103, 063524 (2021) | 10.1103/PhysRevD.103.063524 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform for the first time a dedicated analysis of cosmological
constraints on DFSZ QCD axion models. Such constructions are especially
interesting in light of the recent Xenon-1T excess and of hints from stellar
cooling. In DFSZ models, for $m_a\gtrsim 0.1$ eV, scatterings of pions and
muons can produce a sizable cosmic background of thermal axions, that behave
similarly to massive neutrinos. However, the pion coupling depends on the
alignment between the vevs of two Higgs doublets, and can be significantly
suppressed or enhanced with respect to the KSVZ scenario. Using the latest
Planck and BAO data, we find $m_a\leq 0.2~\text{eV}$ at $95\%$ C.L., when the
axion coupling to pions $c_{a\pi}$ is maximal. Constraints on $m_a$, instead,
can be significantly relaxed when $c_{a\pi}$ is small. In particular, we point
out that in the so-called DFSZ-II model, where the axion coupling to leptons
does not vanish simultaneously with $c_{a\pi}$, production via muons gives
$m_a\leq 0.6~\text{eV}$ at $95\%$ C.L., whereas in the DFSZ-I model bounds on
$m_a$ can be fully lifted. We then combine cosmological data with recent hints
of a DFSZ axion coupled to electrons from the Xenon-1T experiment, finding in
this case that the axion mass is constrained to be in the window $0.07
~\text{eV} \lesssim m_a \lesssim 1.8\, (0.3)~\text{eV}$ for the DFSZ-I
(DFSZ-II) model. A similar analysis with stellar cooling hints gives $3
~\text{meV} \lesssim m_a \lesssim 0.2 ~\text{eV}$ for DFSZ-II, while no
constraint arises in the DFSZ-I case. Forthcoming CMB Stage 4 experiments will
be able to further test such scenarios; for instance the Xenon-1T window should
be fully probed at $2\sigma$ for a DFSZ-I axion.
| [
{
"created": "Fri, 11 Dec 2020 18:53:55 GMT",
"version": "v1"
}
] | 2021-03-31 | [
[
"Ferreira",
"Ricardo Z.",
""
],
[
"Notari",
"Alessio",
""
],
[
"Rompineve",
"Fabrizio",
""
]
] | We perform for the first time a dedicated analysis of cosmological constraints on DFSZ QCD axion models. Such constructions are especially interesting in light of the recent Xenon-1T excess and of hints from stellar cooling. In DFSZ models, for $m_a\gtrsim 0.1$ eV, scatterings of pions and muons can produce a sizable cosmic background of thermal axions, that behave similarly to massive neutrinos. However, the pion coupling depends on the alignment between the vevs of two Higgs doublets, and can be significantly suppressed or enhanced with respect to the KSVZ scenario. Using the latest Planck and BAO data, we find $m_a\leq 0.2~\text{eV}$ at $95\%$ C.L., when the axion coupling to pions $c_{a\pi}$ is maximal. Constraints on $m_a$, instead, can be significantly relaxed when $c_{a\pi}$ is small. In particular, we point out that in the so-called DFSZ-II model, where the axion coupling to leptons does not vanish simultaneously with $c_{a\pi}$, production via muons gives $m_a\leq 0.6~\text{eV}$ at $95\%$ C.L., whereas in the DFSZ-I model bounds on $m_a$ can be fully lifted. We then combine cosmological data with recent hints of a DFSZ axion coupled to electrons from the Xenon-1T experiment, finding in this case that the axion mass is constrained to be in the window $0.07 ~\text{eV} \lesssim m_a \lesssim 1.8\, (0.3)~\text{eV}$ for the DFSZ-I (DFSZ-II) model. A similar analysis with stellar cooling hints gives $3 ~\text{meV} \lesssim m_a \lesssim 0.2 ~\text{eV}$ for DFSZ-II, while no constraint arises in the DFSZ-I case. Forthcoming CMB Stage 4 experiments will be able to further test such scenarios; for instance the Xenon-1T window should be fully probed at $2\sigma$ for a DFSZ-I axion. |
0707.4511 | Stephan Narison | G. Mennessier, P. Minkowski, S. Narison and W. Ochs | Can the gamma-gamma processes reveal the nature of the sigma ? | null | null | null | null | hep-ph | null | We reanalyse the gamma-gamma scattering data and conclude that in the mass
region below 1 GeV the cross section for gamma-gamma to pi^0-pi^0 can be
largely explained by the one pion exchange process with pi-pi rescattering. The
radiative width of the sigma is estimated and a model dependent separation into
contributions from direct gamma-gamma decay and decay through rescattering is
obtained. We confront these findings with QCD spectral sum rule (QSSR)
predictions and conclude that the sigma can have a large gluonium component in
its wave function.
| [
{
"created": "Tue, 31 Jul 2007 19:59:40 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Aug 2007 09:08:33 GMT",
"version": "v2"
}
] | 2007-08-01 | [
[
"Mennessier",
"G.",
""
],
[
"Minkowski",
"P.",
""
],
[
"Narison",
"S.",
""
],
[
"Ochs",
"W.",
""
]
] | We reanalyse the gamma-gamma scattering data and conclude that in the mass region below 1 GeV the cross section for gamma-gamma to pi^0-pi^0 can be largely explained by the one pion exchange process with pi-pi rescattering. The radiative width of the sigma is estimated and a model dependent separation into contributions from direct gamma-gamma decay and decay through rescattering is obtained. We confront these findings with QCD spectral sum rule (QSSR) predictions and conclude that the sigma can have a large gluonium component in its wave function. |
1403.1229 | Tiziano Peraro | Tiziano Peraro | Ninja: Automated Integrand Reduction via Laurent Expansion for One-Loop
Amplitudes | Published version | Computer Physics Communications 185 (2014), pp. 2771-2797 | 10.1016/j.cpc.2014.06.017 | MPP-2014-50 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the public C++ library Ninja, which implements the Integrand
Reduction via Laurent Expansion method for the computation of one-loop
integrals. The algorithm is suited for applications to complex one-loop
processes.
| [
{
"created": "Wed, 5 Mar 2014 19:10:00 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jul 2014 07:39:59 GMT",
"version": "v2"
}
] | 2014-07-22 | [
[
"Peraro",
"Tiziano",
""
]
] | We present the public C++ library Ninja, which implements the Integrand Reduction via Laurent Expansion method for the computation of one-loop integrals. The algorithm is suited for applications to complex one-loop processes. |
1911.08423 | Igor Ivanov | Igor P. Ivanov, Nikolai Korchagin, Alexandr Pimikov, Pengming Zhang | Doing spin physics with unpolarized particles | 5+2 pages, 2 figures | Phys. Rev. Lett. 124, 192001 (2020) | 10.1103/PhysRevLett.124.192001 | CFTP/19-030 | hep-ph hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Twisted, or vortex, particles refer to freely propagating non-plane-wave
states with helicoidal wave fronts. In this state, the particle possesses a
non-zero orbital angular momentum with respect to its average propagation
direction. Twisted photons and electrons have been experimentally demonstrated,
and creation of other particles in twisted states can be anticipated. If
brought in collisions, twisted states offer a new degree of freedom to particle
physics, and it is timely to analyze what new insights may follow. Here, we
theoretically investigate resonance production in twisted photon collisions and
twisted $e^+e^-$ annihilation and show that these processes emerge as a
completely novel probe of spin and parity-sensitive observables in fully
inclusive cross sections with unpolarized initial particles. This is possible
because the initial state with a non-zero angular momentum explicitly breaks
the left-right symmetry even when averaging over helicities. In particular, we
show how one can produce almost $100\%$ polarized vector mesons in unpolarized
twisted $e^+e^-$ annihilation and how to control its polarization state.
| [
{
"created": "Tue, 19 Nov 2019 17:39:51 GMT",
"version": "v1"
}
] | 2020-05-20 | [
[
"Ivanov",
"Igor P.",
""
],
[
"Korchagin",
"Nikolai",
""
],
[
"Pimikov",
"Alexandr",
""
],
[
"Zhang",
"Pengming",
""
]
] | Twisted, or vortex, particles refer to freely propagating non-plane-wave states with helicoidal wave fronts. In this state, the particle possesses a non-zero orbital angular momentum with respect to its average propagation direction. Twisted photons and electrons have been experimentally demonstrated, and creation of other particles in twisted states can be anticipated. If brought in collisions, twisted states offer a new degree of freedom to particle physics, and it is timely to analyze what new insights may follow. Here, we theoretically investigate resonance production in twisted photon collisions and twisted $e^+e^-$ annihilation and show that these processes emerge as a completely novel probe of spin and parity-sensitive observables in fully inclusive cross sections with unpolarized initial particles. This is possible because the initial state with a non-zero angular momentum explicitly breaks the left-right symmetry even when averaging over helicities. In particular, we show how one can produce almost $100\%$ polarized vector mesons in unpolarized twisted $e^+e^-$ annihilation and how to control its polarization state. |
1304.2223 | Vladyslav Pauk | V. Pauk, V. Pascalutsa, M. Vanderhaeghen | Analytic structure of $\phi^4$ theory using light-by-light sum rules | 12 pages, 7 figures | null | 10.1016/j.physletb.2013.07.058 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply a sum rule for the forward light-by-light scattering process within
the context of the $\phi^4$ quantum field theory. As a consequence of the sum
rule a stringent causality criterion is presented and the resulting constraints
are studied within a particular resummation of graphs. Such resummation is
demonstrated to be consistent with the sum rule to all orders of perturbation
theory. We furthermore show the appearance of particular non-perturbative
solutions within such approximation to be a necessary requirement of the sum
rule. For a range of values of the coupling constant, these solutions manifest
themselves as a physical bound state and a $K$-matrix pole. For another domain
however, they appear as tachyon solutions, showing the inconsistency of the
approximation in this region.
| [
{
"created": "Mon, 8 Apr 2013 14:42:45 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Pauk",
"V.",
""
],
[
"Pascalutsa",
"V.",
""
],
[
"Vanderhaeghen",
"M.",
""
]
] | We apply a sum rule for the forward light-by-light scattering process within the context of the $\phi^4$ quantum field theory. As a consequence of the sum rule a stringent causality criterion is presented and the resulting constraints are studied within a particular resummation of graphs. Such resummation is demonstrated to be consistent with the sum rule to all orders of perturbation theory. We furthermore show the appearance of particular non-perturbative solutions within such approximation to be a necessary requirement of the sum rule. For a range of values of the coupling constant, these solutions manifest themselves as a physical bound state and a $K$-matrix pole. For another domain however, they appear as tachyon solutions, showing the inconsistency of the approximation in this region. |
1801.09703 | Gregory Soyez | P. Caucal, E. Iancu, A.H. Mueller and G. Soyez | Vacuum-like jet fragmentation in a dense QCD medium | 5 pages, 3 figures | Phys. Rev. Lett. 120, 232001 (2018) | 10.1103/PhysRevLett.120.232001 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the fragmentation of a jet propagating in a dense quark-gluon
plasma. Using a leading, double-logarithmic approximation in perturbative QCD,
we compute for the first time the effects of the medium on the vacuum-like
emissions. We show that, due to the scatterings off the plasma, the in-medium
parton showers differ from the vacuum ones in two crucial aspects: their
phase-space is reduced and the first emission outside the medium can violate
angular ordering. We compute the jet fragmentation function and find results in
qualitative agreement with measurements at the LHC.
| [
{
"created": "Mon, 29 Jan 2018 19:01:15 GMT",
"version": "v1"
}
] | 2018-06-13 | [
[
"Caucal",
"P.",
""
],
[
"Iancu",
"E.",
""
],
[
"Mueller",
"A. H.",
""
],
[
"Soyez",
"G.",
""
]
] | We study the fragmentation of a jet propagating in a dense quark-gluon plasma. Using a leading, double-logarithmic approximation in perturbative QCD, we compute for the first time the effects of the medium on the vacuum-like emissions. We show that, due to the scatterings off the plasma, the in-medium parton showers differ from the vacuum ones in two crucial aspects: their phase-space is reduced and the first emission outside the medium can violate angular ordering. We compute the jet fragmentation function and find results in qualitative agreement with measurements at the LHC. |
hep-ph/0008051 | Matthias Burkardt | M. Burkardt (New Mexico State University) | Off-forward parton distributions and impact parameter dependent parton
structure | 10 pages, sprocl.sty, talk given at workshop on Continuous Advances
in QCD, Minneapolis, May 12-14, 2000 | null | null | null | hep-ph | null | The connection between parton distributions as a function of the impact
parameter and off-forward parton distributions is discussed in the limit of
vanishing skewedness parameter $\xi$, i.e. when the off-forwardness is purely
transverse. It is also illustrated how to relate $\xi\neq 0$ data to $\xi=0$
data, which is important for experimental measurements of these observables.
| [
{
"created": "Sat, 5 Aug 2000 23:18:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burkardt",
"M.",
"",
"New Mexico State University"
]
] | The connection between parton distributions as a function of the impact parameter and off-forward parton distributions is discussed in the limit of vanishing skewedness parameter $\xi$, i.e. when the off-forwardness is purely transverse. It is also illustrated how to relate $\xi\neq 0$ data to $\xi=0$ data, which is important for experimental measurements of these observables. |
2405.10303 | Wen Yin | Wen Yin, Shota Nakagawa, Tamaki Murokoshi, and Makoto Hattori | Asymmetric Warm Dark Matter: from Cosmological Asymmetry to Chirality of
Life | 22pages, 3figures, comments are welcome | null | null | null | hep-ph astro-ph.CO astro-ph.GA astro-ph.IM physics.bio-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a novel scenario involving asymmetric keV-range dark matter
(DM) in the form of right-handed (sterile) neutrinos. Based on the Fermi-Dirac
distribution, we demonstrate that asymmetric fermionic DM forms a Fermi
degenerate gas, making it potentially colder than symmetric fermionic DM. This
setup simultaneously accounts for the Universe's baryon asymmetry through tiny
Yukawa interactions with Standard Model leptons and the Higgs field, and the
homochirality of amino acids via decay into circularly polarized photons. This
scenario can be investigated through soft X-ray searches conducted by current
and upcoming space missions. The helical X-rays is a smoking-gun signal of our
scenario. Additionally, we propose a new mechanism to suppress DM thermal
production by introducing a light modulus, which may also benefit cosmology
involving generic right-handed neutrinos with large mixing.
| [
{
"created": "Thu, 16 May 2024 17:56:16 GMT",
"version": "v1"
}
] | 2024-05-17 | [
[
"Yin",
"Wen",
""
],
[
"Nakagawa",
"Shota",
""
],
[
"Murokoshi",
"Tamaki",
""
],
[
"Hattori",
"Makoto",
""
]
] | We investigate a novel scenario involving asymmetric keV-range dark matter (DM) in the form of right-handed (sterile) neutrinos. Based on the Fermi-Dirac distribution, we demonstrate that asymmetric fermionic DM forms a Fermi degenerate gas, making it potentially colder than symmetric fermionic DM. This setup simultaneously accounts for the Universe's baryon asymmetry through tiny Yukawa interactions with Standard Model leptons and the Higgs field, and the homochirality of amino acids via decay into circularly polarized photons. This scenario can be investigated through soft X-ray searches conducted by current and upcoming space missions. The helical X-rays is a smoking-gun signal of our scenario. Additionally, we propose a new mechanism to suppress DM thermal production by introducing a light modulus, which may also benefit cosmology involving generic right-handed neutrinos with large mixing. |
1310.3620 | Soumya Rao | Joydeep Chakrabortty, Subhendra Mohanty and Soumya Rao | Non-universal gaugino mass GUT models in the light of dark matter and
LHC constraints | 22 pages, 6 tables, 7 figures; new results added along with
discussion; matches version to be published in JHEP | JHEP02(2014)074 | 10.1007/JHEP02(2014)074 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a comprehensive study of $SU(5)$, $SO(10)$ and $E(6)$
supersymmetric GUT models where the gaugino masses are generated through the
F-term breaking vacuum expectation values of the non-singlet scalar fields. In
these models the gauginos are non-universal at the GUT scale unlike in the
mSUGRA scenario. We discuss the properties of the LSP which is stable and a
viable candidate for cold dark matter. We look for the GUT scale parameter
space that leads to the the lightest SM like Higgs mass in the range of 122-127
GeV compatible with the observations at ATLAS and CMS, the relic density in the
allowed range of WMAP-PLANCK and compatible with other constraints from
colliders and direct detection experiments. We scan universal scalar ($m_0^G$),
trilinear coupling $A_0$ and $SU(3)_C$ gaugino mass ($M_3^G$) as the
independent free parameters for these models. Based on the gaugino mass ratios
at the GUT scale, we classify 25 SUSY GUT models and find that of these only 13
models satisfy the dark matter and collider constraints. Out of these 13 models
there is only one model where there is a sizeable SUSY contribution to muon
$(g-2)$.
| [
{
"created": "Mon, 14 Oct 2013 10:30:50 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Feb 2014 07:58:31 GMT",
"version": "v2"
}
] | 2014-03-03 | [
[
"Chakrabortty",
"Joydeep",
""
],
[
"Mohanty",
"Subhendra",
""
],
[
"Rao",
"Soumya",
""
]
] | We perform a comprehensive study of $SU(5)$, $SO(10)$ and $E(6)$ supersymmetric GUT models where the gaugino masses are generated through the F-term breaking vacuum expectation values of the non-singlet scalar fields. In these models the gauginos are non-universal at the GUT scale unlike in the mSUGRA scenario. We discuss the properties of the LSP which is stable and a viable candidate for cold dark matter. We look for the GUT scale parameter space that leads to the the lightest SM like Higgs mass in the range of 122-127 GeV compatible with the observations at ATLAS and CMS, the relic density in the allowed range of WMAP-PLANCK and compatible with other constraints from colliders and direct detection experiments. We scan universal scalar ($m_0^G$), trilinear coupling $A_0$ and $SU(3)_C$ gaugino mass ($M_3^G$) as the independent free parameters for these models. Based on the gaugino mass ratios at the GUT scale, we classify 25 SUSY GUT models and find that of these only 13 models satisfy the dark matter and collider constraints. Out of these 13 models there is only one model where there is a sizeable SUSY contribution to muon $(g-2)$. |
0907.0296 | Matthias Burkardt | Matthias Burkardt (New Mexico State University) | Generalized Parton Distributions, Deeply Virtual Compton Scattering and
TMDs | 4 pages, invited talk at CIPANP09 | AIP Conf.Proc.1182:859-863,2009 | 10.1063/1.3293944 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Parton distributions in impact parameter space, which are obtained by Fourier
transforming GPDs, exhibit a significant deviation from axial symmetry when
target and/or quark are transversely polarized. In combination with the final
state interactions, this transverse deformation provides a natural mechanism
for naive-T odd transverse single-spin asymmetries in semi-inclusive DIS. The
deformation of PDFs in impact parameter space can also be related to the
transverse force acting on the active quark in polarized DIS at higher twist.
| [
{
"created": "Thu, 2 Jul 2009 07:02:04 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Aug 2009 20:45:44 GMT",
"version": "v2"
}
] | 2010-01-15 | [
[
"Burkardt",
"Matthias",
"",
"New Mexico State University"
]
] | Parton distributions in impact parameter space, which are obtained by Fourier transforming GPDs, exhibit a significant deviation from axial symmetry when target and/or quark are transversely polarized. In combination with the final state interactions, this transverse deformation provides a natural mechanism for naive-T odd transverse single-spin asymmetries in semi-inclusive DIS. The deformation of PDFs in impact parameter space can also be related to the transverse force acting on the active quark in polarized DIS at higher twist. |
2102.04617 | Kiyoharu Kawana | Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana, Kin-ya Oda, and Kei Yagyu | Minimal scenario of Criticality for Electroweak scale, Neutrino Masses,
Dark Matter, and Inflation | 30 pages, 7 figures; Version accepted in EPJC (v2) | null | 10.1140/epjc/s10052-021-09735-z | OU-HET-1087 | hep-ph gr-qc | http://creativecommons.org/licenses/by/4.0/ | We propose a minimal model that can explain the electroweak scale, neutrino
masses, Dark Matter (DM), and successful inflation all at once based on the
multicritical-point principle (MPP). The model has two singlet scalar fields
that realize an analogue of the Coleman-Weinberg mechanism, in addition to the
Standard Model with heavy Majorana right-handed neutrinos. By assuming a $Z_2 $
symmetry, one of the scalars becomes a DM candidate whose property is almost
the same as the minimal Higgs-portal scalar DM. In this model, the MPP can
naturally realize a saddle point in the Higgs potential at high energy scales.
By the renormalization-group analysis, we study the critical Higgs inflation
with non-minimal coupling $\xi |H|^2 R$ that utilizes the saddle point of the
Higgs potential. We find that it is possible to realize successful inflation
even for $\xi=25$ and that the heaviest right-handed neutrino is predicted to
have a mass around $10^{14}$ GeV to meet the current cosmological observations.
Such a small value of $\xi$ can be realized by the Higgs-portal coupling
$\lambda_{SH}\simeq 0.32$ and the vacuum expectation value of the additional
neutral scalar $\langle\phi\rangle\simeq 2.7$ TeV, which correspond to the dark
matter mass 2.0 TeV, its spin-independent cross section $1.8\times10^{-9}$ pb,
and the mass of additional neutral scalar 190 GeV.
| [
{
"created": "Tue, 9 Feb 2021 02:55:54 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2022 06:08:00 GMT",
"version": "v2"
}
] | 2022-01-06 | [
[
"Hamada",
"Yuta",
""
],
[
"Kawai",
"Hikaru",
""
],
[
"Kawana",
"Kiyoharu",
""
],
[
"Oda",
"Kin-ya",
""
],
[
"Yagyu",
"Kei",
""
]
] | We propose a minimal model that can explain the electroweak scale, neutrino masses, Dark Matter (DM), and successful inflation all at once based on the multicritical-point principle (MPP). The model has two singlet scalar fields that realize an analogue of the Coleman-Weinberg mechanism, in addition to the Standard Model with heavy Majorana right-handed neutrinos. By assuming a $Z_2 $ symmetry, one of the scalars becomes a DM candidate whose property is almost the same as the minimal Higgs-portal scalar DM. In this model, the MPP can naturally realize a saddle point in the Higgs potential at high energy scales. By the renormalization-group analysis, we study the critical Higgs inflation with non-minimal coupling $\xi |H|^2 R$ that utilizes the saddle point of the Higgs potential. We find that it is possible to realize successful inflation even for $\xi=25$ and that the heaviest right-handed neutrino is predicted to have a mass around $10^{14}$ GeV to meet the current cosmological observations. Such a small value of $\xi$ can be realized by the Higgs-portal coupling $\lambda_{SH}\simeq 0.32$ and the vacuum expectation value of the additional neutral scalar $\langle\phi\rangle\simeq 2.7$ TeV, which correspond to the dark matter mass 2.0 TeV, its spin-independent cross section $1.8\times10^{-9}$ pb, and the mass of additional neutral scalar 190 GeV. |
1801.04203 | Marco Zaro | C.F. Anders (1), A. Ballestrero (2), J. Balz (3), R. Bellan (4), B.
Biedermann (5), C. Bittrich (6), S. Bra{\ss} (7), I. Brivio (8), L.S. Bruni
(9), J. Butterworth (10), M. Cacciari (11), A. Cardini (12), C. Charlot (13),
V. Ciulli (12), R. Covarelli (4), J. Cuevas (14), A. Denner (5), L. Di
Ciaccio (15), S. Dittmaier (16), S. Duric (17,18), S. Farrington (19), P.
Ferrari (9), P. Ferreira Silva (20), L. Finco (4), D. Giljanovi\'c (21), N.
Glover (22), R. Gomez-Ambrosio (4,22), G. Gomez-Ceballos (23), G. Gonella
(16), P. Govoni (24), C. Goy (15), P. Gras (25), C. Grojean (26), E. Gross
(27), M. Grossi (28), M. Grunewald (29), L. Helary (20), M. Herndon (17), T.
Herrmann (6), A. Hinzmann (30), F. Iltzsche (6), B. J\"ager (31), X. Janssen
(32), H. Jung (26), A. Karlberg (33), O. Kepka (34), B. Kersevan (35), M.
Klute (23), M. Kobel (6), I. Koletsou (15), K. Kordas (36), T. Lampen (37),
J.G.E. Lauwers (32), D. Lelas (21), P. Lenzi (12), Q. Li (38), K. Lipka (26),
K. Lohwasser (39), K. Long (17), N. Lorenzo Martinez (15), E. Maina (4), F.
Maltoni (40), J. Manjarres (6), C. Mariotti (2), O. Mattelaer (22), M.U.
Mozer (41), M. Mulders (20), J. Novak (35), C. Oleari (24), A. Paganoni (42),
M. Pellen (5), G. Pelliccioli (4), C. Petridou (36), P. Pigard (13), M.
Pleier (43), G. Polesello (44), K. Potamianos (26), D. Price (45), I. Puljak
(21), M. Rauch (41), D. Rebuzzi (46), J. Reuter (26), F. Riva (20), V. Rothe
(26), L. Russo (47), R. Salerno (13), D. Sampsonidou (36), L. Sangalli (42),
E. Sauvan (15), M. Schumacher (16), C. Schwan (16), M. Sekulla (41), M.
Selvaggi (20), F. Siegert (6), M. Slawinska (48), H. Snoek (9), P. Sommer
(39), F. Span\`o (49), M. Spannowsky (22), P. Stienemeier (26), J. Strandberg
(50), M. Szleper (51), A. Sznajder (52), S. Tkaczyk (53), S. Todt (6), M.
Trott (8), S. Tzamarias (36), B. Van Eijk (9), A. Vicini (54), M. Voutilainen
(37), E. Vryonidou (20), G. Zanderighi (20), M. Zaro (11,9), D. Zeppenfeld
(41) ((1) Ruprecht-Karls-Universit\"at Heidelberg (DE), (2) INFN Torino (IT),
(3) Johannes-Gutenberg-Universit\"at Mainz (DE), (4) University and INFN
Torino (IT), (5) University of W\"urzburg (DE), (6) Technische Universitaet
Dresden (DE), (7) University of Siegen (DE), (8) Niels Bohr International
Academy and Discovery Center, Niels Bohr Institute, Copenhagen University
(DK), (9) Nikhef National institute for subatomic physics (NL), (10)
Department of Physics and Astronomy, University College London (UK), (11)
Sorbonne Universit\'es and CNRS, LPTHE, Paris (FR), (12) University and INFN,
Firenze (IT), (13) LLR, \'Ecole polytechnique, CNRS/IN2P3, Universit\'e
Paris-Saclay (FR), (14) University of Oviedo (SP), (15) LAPP, Univ. Grenoble
Alpes, Univ. Savoie Mont Blanc, CNRS/IN2P3, Annecy (FR), (16)
Albert-Ludwigs-Universit\"at Freiburg (DE), (17) University of
Wisconsin-Madison (US), (18) Kansas State University (US), (19) Department of
Physics, University of Warwick, Coventry (UK), (20) CERN (CH), (21)
University of Split, FESB (HR), (22) Institute for Particle Physics
Phenomenology, Department of Physics, University of Durham (UK), (23)
Massachusetts Institute of Technology, Cambridge (US), (24) University and
INFN, Milano-Bicocca (IT), (25) CEA/Saclay - IRFU (FR), (26) Deutsches
Elektronen-Synchrotron, Hamburg (DE), (27) Weizmann Institute of Science
(IL), (28) University of Pavia and IBM Italia (IT), (29) University College
Dublin (IE), (30) University of Hamburg (DE), (31) University of T\"ubingen
(DE), (32) University of Antwerp (BE), (33) Universit\"at Z\"urich (CH), (34)
Institute of Physics, Academy of Sciences of the Czech Republic, Praha (CZ),
(35) Department of Experimental Particle Physics, Jo\v{z}ef Stefan Institute
and Department of Physics, University of Ljubljana (SI), (36) Aristotle
University of Thessalon\'iki (GR), (37) University of Helsinki and HIP (FI),
(38) School of Physics and State Key Laboratory of Nuclear Physics and
Technology, Peking University, Beijing (CN), (39) University of Sheffield
(GB), (40) Centre for Cosmology, Particle Physics and Phenomenology
Universit\'e catholique de Louvain (BE), (41) KIT - Karlsruhe Institute of
Technology (DE), (42) MOX - Department of Mathematics, Politecnico di Milano
(IT), (43) Physics Department, Brookhaven National Laboratory, Upton NY (US),
(44) INFN Pavia (IT), (45) University of Manchester (GB), (46) University and
INFN, Pavia (IT), (47) University of Siena and INFN Firenze (IT), (48) Polish
Academy of Sciences (PL), (49) Royal Holloway University of London (UK), (50)
KTH Royal Institute of Technology (SE), (51) National Center for Nuclear
Research, Warsaw (PL), (52) University of the State of Rio de Janeiro (BR),
(53) Fermi National Accelerator Laboratory, Batavia (US), (54) Universit\`a
degli Studi di Milano (IT)) | Vector boson scattering: Recent experimental and theory developments | 41 pages including references, 11 figures, summary of the talks and
discussions happened during the first VBSCan workshop:
https://indico.cern.ch/event/629638/. Note that in v2 the original title
"VBSCan Split 2017 Workshop Summary" has been modified according to the
published version | Rev.Phys. 3 (2018) 44-63 | 10.1016/j.revip.2018.11.001 | VBSCan-PUB-01-17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This document summarises the talks and discussions happened during the VBSCan
Split17 workshop, the first general meeting of the VBSCan COST Action network.
This collaboration is aiming at a consistent and coordinated study of
vector-boson scattering from the phenomenological and experimental point of
view, for the best exploitation of the data that will be delivered by existing
and future particle colliders.
| [
{
"created": "Fri, 12 Jan 2018 15:35:49 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2018 17:00:47 GMT",
"version": "v2"
}
] | 2018-12-14 | [
[
"Anders",
"C. F.",
""
],
[
"Ballestrero",
"A.",
""
],
[
"Balz",
"J.",
""
],
[
"Bellan",
"R.",
""
],
[
"Biedermann",
"B.",
""
],
[
"Bittrich",
"C.",
""
],
[
"Braß",
"S.",
""
],
[
"Brivio",
"I.",
... | This document summarises the talks and discussions happened during the VBSCan Split17 workshop, the first general meeting of the VBSCan COST Action network. This collaboration is aiming at a consistent and coordinated study of vector-boson scattering from the phenomenological and experimental point of view, for the best exploitation of the data that will be delivered by existing and future particle colliders. |
1601.04990 | Alvaro de Rujula | A. De R\'ujula and M. Lusignoli | The calorimetric spectrum of the electron-capture decay of $^{163}$Ho.
The spectral endpoint region | Clarifying changes suggested by a referee. Results unchanged. 14
pages, 15 figures | null | 10.1007/JHEP05(2016)015 | null | hep-ph nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electron-neutrino mass (or masses and mixing angles) may be directly
measurable in weak electron-capture decays. The favoured experimental technique
is "calorimetric". The optimal nuclide is $^{163}$Ho, and several experiments
(ECHo, HOLMES and NuMECS) are currently studying its decay. The most relevant
range of the calorimetric-energy spectrum extends for the last few hundred eV
below its endpoint. It has not yet been well measured. We explore the theory,
mainly in the cited range, of electron capture in $^{163}$Ho decay. A so far
neglected process turns out to be most relevant: electron-capture accompanied
by the shake-off of a second electron. Our two main conclusions are very
encouraging: the counting rate close to the endpoint may be more than an order
of magnitude larger than previously expected; the "pile-up" problem may be
significantly reduced.
| [
{
"created": "Tue, 19 Jan 2016 16:54:20 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Mar 2016 18:21:34 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"De Rújula",
"A.",
""
],
[
"Lusignoli",
"M.",
""
]
] | The electron-neutrino mass (or masses and mixing angles) may be directly measurable in weak electron-capture decays. The favoured experimental technique is "calorimetric". The optimal nuclide is $^{163}$Ho, and several experiments (ECHo, HOLMES and NuMECS) are currently studying its decay. The most relevant range of the calorimetric-energy spectrum extends for the last few hundred eV below its endpoint. It has not yet been well measured. We explore the theory, mainly in the cited range, of electron capture in $^{163}$Ho decay. A so far neglected process turns out to be most relevant: electron-capture accompanied by the shake-off of a second electron. Our two main conclusions are very encouraging: the counting rate close to the endpoint may be more than an order of magnitude larger than previously expected; the "pile-up" problem may be significantly reduced. |
2407.18196 | Andrew Long | Andrew J. Long and Jessica Turner | Thermal pressure on ultrarelativistic bubbles from a semiclassical
formalism | 29 pages plus appendices, 4 figures, 1 table | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a planar bubble wall that is traveling at an ultrarelativistic speed
through a thermal plasma. This situation may arise during a first order
electroweak phase transition in the early universe. As particles cross the
wall, it is assumed that their mass grows from $m_a$ to $m_b$, and they are
decelerated causing them to emit massless radiation. We are interested in the
momentum transfer to the wall, the thermal pressure felt by the wall, and the
resultant terminal velocity of the wall. We employ the semiclassical current
radiation (SCR) formalism to perform these calculations. An incident charged
particle is treated as a point-like classical electromagnetic current, and the
spectrum of quantum electromagnetic radiation (photons) is derived by
calculating appropriate matrix elements. To understand how the spectrum depends
on the thickness of the wall, we explore simplified models for the current
corresponding to an abrupt and a gradual deceleration. For the model of abrupt
deceleration, we find that the SCR formalism can reproduce the
$P_\mathrm{therm} \propto \gamma_w^0$ scaling found in earlier work by assuming
that the emission is soft, but if the emission is not soft the SCR formalism
can be used to obtain $P_\mathrm{therm} \propto \gamma_w^2$ instead. For the
model of gradual deceleration, we find that the wall thickness $L_w$ enters to
cutoff the otherwise log-flat radiation spectrum above a momentum of $\sim
\gamma_w^2 / L_w$, and we discuss the connections with classical
electromagnetic bremsstrahlung.
| [
{
"created": "Thu, 25 Jul 2024 16:59:38 GMT",
"version": "v1"
}
] | 2024-07-26 | [
[
"Long",
"Andrew J.",
""
],
[
"Turner",
"Jessica",
""
]
] | We study a planar bubble wall that is traveling at an ultrarelativistic speed through a thermal plasma. This situation may arise during a first order electroweak phase transition in the early universe. As particles cross the wall, it is assumed that their mass grows from $m_a$ to $m_b$, and they are decelerated causing them to emit massless radiation. We are interested in the momentum transfer to the wall, the thermal pressure felt by the wall, and the resultant terminal velocity of the wall. We employ the semiclassical current radiation (SCR) formalism to perform these calculations. An incident charged particle is treated as a point-like classical electromagnetic current, and the spectrum of quantum electromagnetic radiation (photons) is derived by calculating appropriate matrix elements. To understand how the spectrum depends on the thickness of the wall, we explore simplified models for the current corresponding to an abrupt and a gradual deceleration. For the model of abrupt deceleration, we find that the SCR formalism can reproduce the $P_\mathrm{therm} \propto \gamma_w^0$ scaling found in earlier work by assuming that the emission is soft, but if the emission is not soft the SCR formalism can be used to obtain $P_\mathrm{therm} \propto \gamma_w^2$ instead. For the model of gradual deceleration, we find that the wall thickness $L_w$ enters to cutoff the otherwise log-flat radiation spectrum above a momentum of $\sim \gamma_w^2 / L_w$, and we discuss the connections with classical electromagnetic bremsstrahlung. |
1602.07697 | Howard Baer | Howard Baer, Vernon Barger, Michael Savoy and Hasan Serce | The Higgs mass and natural supersymmetric spectrum from the landscape | 5 pages plus 3 figures; version 2 coincides with published version,
some references added | null | 10.1016/j.physletb.2016.05.010 | OU-HEP-160225 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In supersymmetric models where the superpotential mu term is generated with
mu<< m_{soft} (e.g. from radiative Peccei-Quinn symmetry breaking or
compactified string models with sequestration and stabilized moduli), and where
the string landscape 1. favors soft supersymmetry (SUSY) breaking terms as
large as possible and 2. where the anthropic condition that electroweak
symmetry is properly broken with a weak scale m_{W,Z,h}~100 GeV ({\it i.e.} not
too weak of weak interactions), then these combined landscape/anthropic
requirements act as an attractor pulling the soft SUSY breaking terms towards
values required by models with radiatively-driven naturalness: near the line of
criticality where electroweak symmetry is barely broken and the Higgs mass is
~125 GeV. The pull on the soft terms serves to ameliorate the SUSY flavor and
CP problems. The resulting sparticle mass spectrum may barely be accessible at
high-luminosity LHC while the required light higgsinos should be visible at a
linear e^+e^- collider with \sqrt{s}>2m(higgsino).
| [
{
"created": "Wed, 24 Feb 2016 21:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2016 16:55:19 GMT",
"version": "v2"
}
] | 2016-06-22 | [
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Savoy",
"Michael",
""
],
[
"Serce",
"Hasan",
""
]
] | In supersymmetric models where the superpotential mu term is generated with mu<< m_{soft} (e.g. from radiative Peccei-Quinn symmetry breaking or compactified string models with sequestration and stabilized moduli), and where the string landscape 1. favors soft supersymmetry (SUSY) breaking terms as large as possible and 2. where the anthropic condition that electroweak symmetry is properly broken with a weak scale m_{W,Z,h}~100 GeV ({\it i.e.} not too weak of weak interactions), then these combined landscape/anthropic requirements act as an attractor pulling the soft SUSY breaking terms towards values required by models with radiatively-driven naturalness: near the line of criticality where electroweak symmetry is barely broken and the Higgs mass is ~125 GeV. The pull on the soft terms serves to ameliorate the SUSY flavor and CP problems. The resulting sparticle mass spectrum may barely be accessible at high-luminosity LHC while the required light higgsinos should be visible at a linear e^+e^- collider with \sqrt{s}>2m(higgsino). |
hep-ph/0101034 | Abhijit Samanta | Amitava Datta, Anirban Kundu and Abhijit Samanta | New Bounds on Slepton and Wino Masses in Anomaly Mediated Supersymmetry
Breaking Models | 4 pages, 1 postscript figure, uses revtex.sty (included). Some points
clarified in v2, conclusion unchanged, to be published in Phys. Rev. D | Phys.Rev. D64 (2001) 095016 | 10.1103/PhysRevD.64.095016 | null | hep-ph | null | We show how the spectrum of the minimal anomaly-mediated supersymmetry
breaking model can be constrained from the condition that the electroweak
symmetry breaking minimum of the scalar potential is the deepest point in the
field space. Applying the current experimental bounds and scanning over the
whole parameter space, we rule out selectrons below 378 GeV and staus below 269
GeV, the numbers having a modest uncertainty. We also find a new upper bound on
the wino-like chargino mass for a given slepton mass. This rules out the
possibility of slepton pair production at ongoing or upcoming colliders like
the Tevatron or the Next Linear Collider at $\sqrt{s}=500$ GeV, where pair
production of charginos may be the only available signal.
| [
{
"created": "Thu, 4 Jan 2001 08:28:53 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jul 2001 13:16:51 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Datta",
"Amitava",
""
],
[
"Kundu",
"Anirban",
""
],
[
"Samanta",
"Abhijit",
""
]
] | We show how the spectrum of the minimal anomaly-mediated supersymmetry breaking model can be constrained from the condition that the electroweak symmetry breaking minimum of the scalar potential is the deepest point in the field space. Applying the current experimental bounds and scanning over the whole parameter space, we rule out selectrons below 378 GeV and staus below 269 GeV, the numbers having a modest uncertainty. We also find a new upper bound on the wino-like chargino mass for a given slepton mass. This rules out the possibility of slepton pair production at ongoing or upcoming colliders like the Tevatron or the Next Linear Collider at $\sqrt{s}=500$ GeV, where pair production of charginos may be the only available signal. |
1408.2297 | Tao Zhong | Tao Zhong, Xing-Gang Wu and Tao Huang | Heavy Pseudoscalar Leading-Twist Distribution Amplitudes within QCD
Theory in Background Fields | 14 pages, 14 figures | Eur.Phys.J. C75 (2015) 2, 45 | 10.1140/epjc/s10052-015-3271-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the leading-twist distribution amplitude (DA) of the
heavy pseudoscalars (HPs), such as $\eta_c$, $\eta_b$ and $B_c$, within the QCD
theory in the background fields. New sum rules up to dimension-six condensates
for both the HP decay constants and their leading-twist DA moments are
presented. From the sum rules for the HP decay constants, we obtain $f_{\eta_c}
= 453 \pm 4 \textrm{MeV}$, $f_{B_c} = 498 \pm 14 \textrm{MeV}$, and $f_{\eta_b}
= 811 \pm 34 \textrm{MeV}$. Basing on the sum rules for the HPs' leading-twist
DA moments, we construct a new model for the $\eta_c$, $\eta_b$ and $B_c$
leading-twist DAs. Our present HP DA model can also be adaptable for the light
pseudo-scalar DAs, such as the pion and kaon DAs. Thus, it shall be applicable
for a wide range of QCD exclusive processes. As an application, we apply the
$\eta_c$ leading-twist DA to calculate the $B_c \to \eta_c$ transition form
factor $f_+^{B_c \to \eta_c}(q^2)$. At the maximum recoil region, we obtain
$f_+^{B_c \to \eta_c}(0) = 0.612^{+0.053}_{-0.052}$. After further
extrapolating the TFF $f_+^{B_c \to \eta_c}(q^2)$ to its allowable $q^2$
region, we predict the branching ratio for the semi-leptonic decay $B_c \to
\eta_c l \nu$. We obtain ${\cal B}(B_c \to \eta_c l
\nu)=\left(7.70^{+1.65}_{-1.48}\right) \times 10^{-3}$ for massless leptons,
which is consistent with the LCSRs estimation obtained in the literature.
| [
{
"created": "Mon, 11 Aug 2014 02:50:20 GMT",
"version": "v1"
}
] | 2015-09-21 | [
[
"Zhong",
"Tao",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Huang",
"Tao",
""
]
] | In this paper, we study the leading-twist distribution amplitude (DA) of the heavy pseudoscalars (HPs), such as $\eta_c$, $\eta_b$ and $B_c$, within the QCD theory in the background fields. New sum rules up to dimension-six condensates for both the HP decay constants and their leading-twist DA moments are presented. From the sum rules for the HP decay constants, we obtain $f_{\eta_c} = 453 \pm 4 \textrm{MeV}$, $f_{B_c} = 498 \pm 14 \textrm{MeV}$, and $f_{\eta_b} = 811 \pm 34 \textrm{MeV}$. Basing on the sum rules for the HPs' leading-twist DA moments, we construct a new model for the $\eta_c$, $\eta_b$ and $B_c$ leading-twist DAs. Our present HP DA model can also be adaptable for the light pseudo-scalar DAs, such as the pion and kaon DAs. Thus, it shall be applicable for a wide range of QCD exclusive processes. As an application, we apply the $\eta_c$ leading-twist DA to calculate the $B_c \to \eta_c$ transition form factor $f_+^{B_c \to \eta_c}(q^2)$. At the maximum recoil region, we obtain $f_+^{B_c \to \eta_c}(0) = 0.612^{+0.053}_{-0.052}$. After further extrapolating the TFF $f_+^{B_c \to \eta_c}(q^2)$ to its allowable $q^2$ region, we predict the branching ratio for the semi-leptonic decay $B_c \to \eta_c l \nu$. We obtain ${\cal B}(B_c \to \eta_c l \nu)=\left(7.70^{+1.65}_{-1.48}\right) \times 10^{-3}$ for massless leptons, which is consistent with the LCSRs estimation obtained in the literature. |
hep-ph/9909421 | Hubert Spiesberger | H. Spiesberger | Beyond the Standard Model at HERA | 13 pages, 7 eps-figures included. Lecture notes to appear in the
proceedings of the Ringberg Workshop 'New Trends in HERA Physics 1999' | null | null | MZ-TH/99-39 | hep-ph | null | The prospects of physics beyond the standard model in deep inelastic
scattering are reviewed, emphasizing the search for contact interactions, for
leptoquarks and for supersymmetry with R-parity violation. R-parity violating
supersymmetry is explored as a speculative source of events with high energy
muons and missing transverse momentum, but no convincing explanation for events
of this type observed at H1 is found.
| [
{
"created": "Fri, 17 Sep 1999 14:53:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Spiesberger",
"H.",
""
]
] | The prospects of physics beyond the standard model in deep inelastic scattering are reviewed, emphasizing the search for contact interactions, for leptoquarks and for supersymmetry with R-parity violation. R-parity violating supersymmetry is explored as a speculative source of events with high energy muons and missing transverse momentum, but no convincing explanation for events of this type observed at H1 is found. |
2011.13397 | Yizhuang Liu | Xiangdong Ji, Yizhuang Liu, Andreas Sch\"afer, Feng Yuan | Single Transverse-Spin Asymmetry and Sivers Function in Large Momentum
Effective Theory | 12 pages, 6 figures | Phys. Rev. D 103, 074005 (2021) | 10.1103/PhysRevD.103.074005 | null | hep-ph hep-ex hep-lat nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | We apply recent developments in large momentum effective theory (LaMET) to
formulate a non-perturbative calculation of the single-transverse spin
asymmetry in terms of the quasi transverse-momentum-dependent quark
distribution functions from the so-called Sivers mechanism. When the spin
asymmetry is defined as the ratio of the quark Sivers function over the spin
averaged distribution, it can be directly calculated in terms of the relevant
quasi distributions with the soft functions and perturbative matching kernels
cancelling out. Apart from the general formula presented, we have verified the
result in the small transverse distance limit at one-loop order, which reduces
to a collinear expansion at twist-three level.
| [
{
"created": "Thu, 26 Nov 2020 17:24:28 GMT",
"version": "v1"
}
] | 2021-04-14 | [
[
"Ji",
"Xiangdong",
""
],
[
"Liu",
"Yizhuang",
""
],
[
"Schäfer",
"Andreas",
""
],
[
"Yuan",
"Feng",
""
]
] | We apply recent developments in large momentum effective theory (LaMET) to formulate a non-perturbative calculation of the single-transverse spin asymmetry in terms of the quasi transverse-momentum-dependent quark distribution functions from the so-called Sivers mechanism. When the spin asymmetry is defined as the ratio of the quark Sivers function over the spin averaged distribution, it can be directly calculated in terms of the relevant quasi distributions with the soft functions and perturbative matching kernels cancelling out. Apart from the general formula presented, we have verified the result in the small transverse distance limit at one-loop order, which reduces to a collinear expansion at twist-three level. |
2306.17830 | Simone Blasi | Simone Blasi, Alberto Mariotti, A\"aron Rase, Alexander Sevrin | Axionic domain walls at Pulsar Timing Arrays: QCD bias and particle
friction | 15 pages, 4 figures | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent results from the Pulsar Timing Array (PTA) collaborations show the
first evidence for the detection of a stochastic background of gravitational
waves at the nHz frequencies. This discovery has profound implications for the
physics of both the late and the early Universe. In fact, together with the
possible interpretation in terms of super massive black hole binaries, many
sources in the early Universe can provide viable explanations as well. In this
paper, we study the gravitational wave background sourced by a network of
axion-like-particle (ALP) domain walls at temperatures around the QCD
crossover, where the QCD-induced potential provides the necessary bias to
annihilate the network. Remarkably, this implies a peak amplitude at
frequencies around the sensitivity range of PTAs. We extend previous analysis
by taking into account the unavoidable friction on the network stemming from
the topological coupling of the ALP to QCD in terms of gluon and pion
reflection off the domain walls at high and low temperatures, respectively. We
identify the regions of parameter space where the network annihilates in the
scaling regime ensuring compatibility with the PTA results, as well as those
where friction can be important and a more detailed study around the QCD
crossover is required.
| [
{
"created": "Fri, 30 Jun 2023 17:50:20 GMT",
"version": "v1"
}
] | 2023-07-03 | [
[
"Blasi",
"Simone",
""
],
[
"Mariotti",
"Alberto",
""
],
[
"Rase",
"Aäron",
""
],
[
"Sevrin",
"Alexander",
""
]
] | The recent results from the Pulsar Timing Array (PTA) collaborations show the first evidence for the detection of a stochastic background of gravitational waves at the nHz frequencies. This discovery has profound implications for the physics of both the late and the early Universe. In fact, together with the possible interpretation in terms of super massive black hole binaries, many sources in the early Universe can provide viable explanations as well. In this paper, we study the gravitational wave background sourced by a network of axion-like-particle (ALP) domain walls at temperatures around the QCD crossover, where the QCD-induced potential provides the necessary bias to annihilate the network. Remarkably, this implies a peak amplitude at frequencies around the sensitivity range of PTAs. We extend previous analysis by taking into account the unavoidable friction on the network stemming from the topological coupling of the ALP to QCD in terms of gluon and pion reflection off the domain walls at high and low temperatures, respectively. We identify the regions of parameter space where the network annihilates in the scaling regime ensuring compatibility with the PTA results, as well as those where friction can be important and a more detailed study around the QCD crossover is required. |
hep-ph/9903349 | Jie Jie Zhu | Jie-Jie Zhu, Mu-Lin Yan (USTC) | Covariant amplitudes for mesons | 30 pages, RevTeX, 3 eps figures | null | null | null | hep-ph hep-ex | null | We show how to construct covariant amplitudes for processes involving higher
spins in this paper. First we give the explicit expressions of Rarita-Schwinger
wave functions and propagators for bosons with spins, then kinematic
singularity free 3-leg effective vertexes are derived and given in a list.
Equivalence relations are worked out to get these independent vertexes.
Constraints of space reflection symmetry and boson symmetry are considered and
shown in a explicit way. Some helicity amplitudes for two-body decays in center
of frame are calculated. Finally the covariant helicity amplitudes for the
process $a_1\to \pi^+\pi^+\pi^-$ are constructed to illustrate how to include
background (1PI) amplitudes. Both background amplitudes and resonance
amplitudes are needed to give reliable descriptions to high energy reactions.
| [
{
"created": "Mon, 15 Mar 1999 02:12:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zhu",
"Jie-Jie",
"",
"USTC"
],
[
"Yan",
"Mu-Lin",
"",
"USTC"
]
] | We show how to construct covariant amplitudes for processes involving higher spins in this paper. First we give the explicit expressions of Rarita-Schwinger wave functions and propagators for bosons with spins, then kinematic singularity free 3-leg effective vertexes are derived and given in a list. Equivalence relations are worked out to get these independent vertexes. Constraints of space reflection symmetry and boson symmetry are considered and shown in a explicit way. Some helicity amplitudes for two-body decays in center of frame are calculated. Finally the covariant helicity amplitudes for the process $a_1\to \pi^+\pi^+\pi^-$ are constructed to illustrate how to include background (1PI) amplitudes. Both background amplitudes and resonance amplitudes are needed to give reliable descriptions to high energy reactions. |
1106.1734 | Brian Feldstein | Jason Evans, Brian Feldstein, William Klemm, Hitoshi Murayama and
Tsutomu T. Yanagida | Hermitian Flavor Violation | 18 pages, 3 figures | Phys.Lett.B703:599-605,2011 | 10.1016/j.physletb.2011.08.059 | IPMU11-0067 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fundamental constraint on two Higgs doublet models comes from the
requirement of sufficiently suppressing flavor-changing neutral currents. There
are various standard approaches for dealing with this problem, but they all
tend to share a common feature; all of the Higgs doublets couple very weakly to
the first generation quarks. Here we consider a simple two Higgs doublet model
which is able to have large couplings to the first generation, while also being
safe from flavor constraints. We assume only that there is an SU(3)_f flavor
symmetry which is respected by the couplings of one of the Higgs doublets, and
which is broken by Hermitian Yukawa couplings of the second doublet. As a
result of the large permitted couplings to the first generation quarks, this
scenario may be used to address the excess in W+dijet events recently observed
by CDF at the Tevatron. Moreover, Hermitian Yukawa coupling matrices arise
naturally in a broad class of solutions to the strong CP problem, providing a
compelling context for the model.
| [
{
"created": "Thu, 9 Jun 2011 08:12:42 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Evans",
"Jason",
""
],
[
"Feldstein",
"Brian",
""
],
[
"Klemm",
"William",
""
],
[
"Murayama",
"Hitoshi",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | The fundamental constraint on two Higgs doublet models comes from the requirement of sufficiently suppressing flavor-changing neutral currents. There are various standard approaches for dealing with this problem, but they all tend to share a common feature; all of the Higgs doublets couple very weakly to the first generation quarks. Here we consider a simple two Higgs doublet model which is able to have large couplings to the first generation, while also being safe from flavor constraints. We assume only that there is an SU(3)_f flavor symmetry which is respected by the couplings of one of the Higgs doublets, and which is broken by Hermitian Yukawa couplings of the second doublet. As a result of the large permitted couplings to the first generation quarks, this scenario may be used to address the excess in W+dijet events recently observed by CDF at the Tevatron. Moreover, Hermitian Yukawa coupling matrices arise naturally in a broad class of solutions to the strong CP problem, providing a compelling context for the model. |
hep-ph/9712517 | Evgeny Levin | E.Gotsman, E. levin and U.Maor (Tel Aviv Univ.) | The $F_2$ slope and shadowing corrections in DIS | Latex file 10 pp, figs in eps files | Phys.Lett.B425:369-374,1998 | 10.1016/S0370-2693(98)00230-5 | TAUP 2471/97 | hep-ph | null | Recent HERA low $Q^2$ data show that the logarithmic slope of the
protonstructure function ($\frac{\partial F_2}{\partial \ln Q^2}$) is
significantly different from perturbative QCD expectations for smallvalues of
$Q^2$ at exeedingly small values of $x$. We show that shadowing (screening)
corrections provide a natural explanation for this experimental observation.
| [
{
"created": "Wed, 24 Dec 1997 08:21:02 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Gotsman",
"E.",
"",
"Tel Aviv Univ."
],
[
"levin",
"E.",
"",
"Tel Aviv Univ."
],
[
"Maor",
"U.",
"",
"Tel Aviv Univ."
]
] | Recent HERA low $Q^2$ data show that the logarithmic slope of the protonstructure function ($\frac{\partial F_2}{\partial \ln Q^2}$) is significantly different from perturbative QCD expectations for smallvalues of $Q^2$ at exeedingly small values of $x$. We show that shadowing (screening) corrections provide a natural explanation for this experimental observation. |
1107.0649 | Dilip Kumar Ghosh | Dilip Kumar Ghosh, Manas Maity, Sourov Roy | R parity violating supersymmetric explanation for the CDF Wjj excess | 4 pages, 2 ps figures, revtex4, typos corrected, one new reference
added, version to appear in PRD | Phys.Rev.D84:035022,2011 | 10.1103/PhysRevD.84.035022 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently CDF has reported a 4.1 sigma excess in the distribution of the dijet
invariant mass between 120-160 GeV in Wjj event sample in 7.3 fb^{-1} of data,
which has generated considerable interest. We offer a possible explanation of
this observation in the general framework of MSSM with R-parity violation
through resonance production of tau sneutrino decaying into the LSP stau_1 and
W boson. We also give the predictions of this scenario for the LHC operating at
7 TeV center of mass energy.
| [
{
"created": "Mon, 4 Jul 2011 15:06:59 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2011 08:07:38 GMT",
"version": "v2"
}
] | 2011-09-14 | [
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Maity",
"Manas",
""
],
[
"Roy",
"Sourov",
""
]
] | Recently CDF has reported a 4.1 sigma excess in the distribution of the dijet invariant mass between 120-160 GeV in Wjj event sample in 7.3 fb^{-1} of data, which has generated considerable interest. We offer a possible explanation of this observation in the general framework of MSSM with R-parity violation through resonance production of tau sneutrino decaying into the LSP stau_1 and W boson. We also give the predictions of this scenario for the LHC operating at 7 TeV center of mass energy. |
2104.10709 | Jia Zhou | Michael J. Ramsey-Musolf and Jiang-Hao Yu and Jia Zhou | Probing Extended Scalar Sectors with Precision $e^+e^-\to Zh$ and Higgs
Diphoton Studies | 43 pages, 11 figures; v3: major revision requested by editor | null | 10.1007/JHEP10(2021)155 | ACFI-T21-01 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We compute the one-loop corrections to $\sigma(e^+ e^- \to Z h)$ arising from
representative extended Standard Model scalar sector scenarios. According to
the new scalar $\mathrm{SU(2)_L}$ representations, we consider the inert
doublet, real and complex triplet, quintuplet, and septuplet models. With the
sub-percent level precision expected for prospective future $e+e-$ collider
measurements of $\sigma(e^+ e^- \to Z h)$, studies of the Higgsstrahlung
process will probe extended scalar sector particle spectrum and interactions in
a manner complementary to direct searches at the Large Hadron Collider and
possible future $pp$ colliders. We also compare with the sensitivity of future
Higgs diphoton decay rate measurements. We find that the $\sigma(e^+ e^- \to Z
h)$ and $\Gamma(h\to\gamma\gamma)$ complementarity is particularly pronounced
for the complex triplet model.
| [
{
"created": "Wed, 21 Apr 2021 18:16:53 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jun 2021 16:27:47 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Sep 2021 18:34:44 GMT",
"version": "v3"
}
] | 2021-11-03 | [
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Yu",
"Jiang-Hao",
""
],
[
"Zhou",
"Jia",
""
]
] | We compute the one-loop corrections to $\sigma(e^+ e^- \to Z h)$ arising from representative extended Standard Model scalar sector scenarios. According to the new scalar $\mathrm{SU(2)_L}$ representations, we consider the inert doublet, real and complex triplet, quintuplet, and septuplet models. With the sub-percent level precision expected for prospective future $e+e-$ collider measurements of $\sigma(e^+ e^- \to Z h)$, studies of the Higgsstrahlung process will probe extended scalar sector particle spectrum and interactions in a manner complementary to direct searches at the Large Hadron Collider and possible future $pp$ colliders. We also compare with the sensitivity of future Higgs diphoton decay rate measurements. We find that the $\sigma(e^+ e^- \to Z h)$ and $\Gamma(h\to\gamma\gamma)$ complementarity is particularly pronounced for the complex triplet model. |
1205.5555 | Jessica Goodman | Linda M. Carpenter and Jessica Goodman | Pseudo-Higgs Signals a the LHC | 6 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider general fermi-phobic scenarios in which excess events in diphoton
or WW/ZZ resonances may be seen at LHC. These Higgs like signals do not
necessarily suggest that the new resonance is a particle with Yukawa couplings
nor do we know that it is responsible for electroweak symmetry breaking. We
can, however, extract two facts from it, this particle couples to pairs of
SU(2) and U(1) gauge bosons and it must be a scalar, pseudoscalar, or tensor.
We consider the signals of general operators up to effective dimension 5 in
which a new scalar, psuedo-scalar, or tensor particle may couple to pairs of
standard model gauge bosons. This particle may or may not be charged under the
standard model gauge groups, and may be produced via gluon fusion or EW vector
boson fusion.
| [
{
"created": "Thu, 24 May 2012 20:00:03 GMT",
"version": "v1"
}
] | 2015-03-20 | [
[
"Carpenter",
"Linda M.",
""
],
[
"Goodman",
"Jessica",
""
]
] | We consider general fermi-phobic scenarios in which excess events in diphoton or WW/ZZ resonances may be seen at LHC. These Higgs like signals do not necessarily suggest that the new resonance is a particle with Yukawa couplings nor do we know that it is responsible for electroweak symmetry breaking. We can, however, extract two facts from it, this particle couples to pairs of SU(2) and U(1) gauge bosons and it must be a scalar, pseudoscalar, or tensor. We consider the signals of general operators up to effective dimension 5 in which a new scalar, psuedo-scalar, or tensor particle may couple to pairs of standard model gauge bosons. This particle may or may not be charged under the standard model gauge groups, and may be produced via gluon fusion or EW vector boson fusion. |
hep-ph/0509021 | Gouranga Nayak | Gouranga C. Nayak (SUNY, Stony Brook), Jian-Wei Qiu (Iowa State U.),
George Sterman (SUNY, Stony Brook) | Fragmentation, NRQCD and NNLO Factorization Analysis in Heavy Quarkonium
Production | 53 pages latex, 37 eps files, version to appear in Phys. Rev. D | Phys.Rev.D72:114012,2005 | 10.1103/PhysRevD.72.114012 | YITP-SB-05-26 | hep-ph nucl-th | null | We discuss heavy quarkonium production through parton fragmentation,
including a review of arguments for the factorization of high-p_T particles
into fragmentation functions for hadronic initial states. We investigate the
further factorization of fragmentation functions in the NRQCD formalism, and
argue that this requires a modification of NRQCD octet production matrix
elements to include nonabelian phases, which makes them gauge invariant. We
describe the calculation of uncanceled infrared divergences in fragmentation
functions that must be factorized at NNLO, and verify that they are absorbed
into the new, gauge invariant matrix elements.
| [
{
"created": "Fri, 2 Sep 2005 20:28:55 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2005 22:02:38 GMT",
"version": "v2"
}
] | 2012-07-30 | [
[
"Nayak",
"Gouranga C.",
"",
"SUNY, Stony Brook"
],
[
"Qiu",
"Jian-Wei",
"",
"Iowa State U."
],
[
"Sterman",
"George",
"",
"SUNY, Stony Brook"
]
] | We discuss heavy quarkonium production through parton fragmentation, including a review of arguments for the factorization of high-p_T particles into fragmentation functions for hadronic initial states. We investigate the further factorization of fragmentation functions in the NRQCD formalism, and argue that this requires a modification of NRQCD octet production matrix elements to include nonabelian phases, which makes them gauge invariant. We describe the calculation of uncanceled infrared divergences in fragmentation functions that must be factorized at NNLO, and verify that they are absorbed into the new, gauge invariant matrix elements. |
hep-ph/9408251 | null | F. Hautmann | Next-to-Leading Corrections at Small X from Quark Evolution | 8 pages (+ 3 figures not included, available from the author), Latex,
Cavendish-HEP-94/08 | null | null | null | hep-ph | null | Deep inelastic processes at small x are discussed in the framework of
perturbative QCD at high energy. New results are presented on the quark
anomalous dimensions beyond the leading logarithmic approximation, and their
relevance to the structure functions being measured at HERA is pointed out.
*Talk given at the XXIX Rencontres de Moriond, 19-26 March 1994, Meribel,
France, to appear in the Proceedings.
| [
{
"created": "Mon, 8 Aug 1994 13:39:25 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Hautmann",
"F.",
""
]
] | Deep inelastic processes at small x are discussed in the framework of perturbative QCD at high energy. New results are presented on the quark anomalous dimensions beyond the leading logarithmic approximation, and their relevance to the structure functions being measured at HERA is pointed out. *Talk given at the XXIX Rencontres de Moriond, 19-26 March 1994, Meribel, France, to appear in the Proceedings. |
hep-ph/9612272 | Steven Abel | S.A.Abel | CP in R-parity Violating Models | 11 pages requires axodraw.sty (included). Error corrected and
comments added. Final version - to appear in Phys.Lett.B | Phys.Lett. B410 (1997) 173-180 | 10.1016/S0370-2693(97)01034-4 | ULB-TH-96/21 | hep-ph | null | It is shown that in R-parity violating models of supersymmetry, the CP
violation observed in the kaon system could arise purely from the R-parity
violating scalar interactions (A-terms), with no CP violation in the CKM
matrix. The direct CP violating parameter, epsilon', could be as large or
larger than that expected in the Standard Model. CP violation in the B system
however is expected to be negligible.
| [
{
"created": "Fri, 6 Dec 1996 10:59:35 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jan 1997 17:32:59 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Jan 1997 09:33:49 GMT",
"version": "v3"
},
{
"created": "Tue, 19 Aug 1997 10:38:50 GMT",
"version": "v4"
}
] | 2009-10-30 | [
[
"Abel",
"S. A.",
""
]
] | It is shown that in R-parity violating models of supersymmetry, the CP violation observed in the kaon system could arise purely from the R-parity violating scalar interactions (A-terms), with no CP violation in the CKM matrix. The direct CP violating parameter, epsilon', could be as large or larger than that expected in the Standard Model. CP violation in the B system however is expected to be negligible. |
2207.10021 | Malcolm Fairbairn | Ahmad Alachkar, John Ellis and Malcolm Fairbairn | Dark Matter Constraints from the Eccentric Supermassive Black Hole
Binary OJ 287 | Matches version accepted for publication | null | 10.1103/PhysRevD.107.103033 | KCL-PH-TH/2022-40, CERN-TH-2022-115 | hep-ph astro-ph.HE gr-qc | http://creativecommons.org/licenses/by/4.0/ | OJ 287 is a blazar thought to be a binary system containing a ~ 18 billion
solar mass primary black hole accompanied by a ~ 150 million solar mass
secondary black hole in an eccentric orbit, which triggers electromagnetic
flares twice in every ~ 12 year orbital period when it traverses the accretion
disk of the primary. The times of these emissions are consistent with the
predictions of general relativity calculated to the 4.5th post-Newtonian order.
The orbit of the secondary black hole samples the gravitational field at
distances between O(10) and O(50) Schwarzschild radii around the primary, and
hence is sensitive to the possible presence of a dark matter spike around it.
We find that the agreement of general-relativistic calculations with the
measured timings of flares from OJ 287 constrains the mass of such a spike to <
3% of the primary mass.
| [
{
"created": "Tue, 12 Jul 2022 16:44:56 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2023 15:38:16 GMT",
"version": "v2"
}
] | 2023-05-31 | [
[
"Alachkar",
"Ahmad",
""
],
[
"Ellis",
"John",
""
],
[
"Fairbairn",
"Malcolm",
""
]
] | OJ 287 is a blazar thought to be a binary system containing a ~ 18 billion solar mass primary black hole accompanied by a ~ 150 million solar mass secondary black hole in an eccentric orbit, which triggers electromagnetic flares twice in every ~ 12 year orbital period when it traverses the accretion disk of the primary. The times of these emissions are consistent with the predictions of general relativity calculated to the 4.5th post-Newtonian order. The orbit of the secondary black hole samples the gravitational field at distances between O(10) and O(50) Schwarzschild radii around the primary, and hence is sensitive to the possible presence of a dark matter spike around it. We find that the agreement of general-relativistic calculations with the measured timings of flares from OJ 287 constrains the mass of such a spike to < 3% of the primary mass. |
hep-ph/0010188 | Blazenka Melic | J.G. Koerner and B. Melic | Exclusive and Inclusive Semileptonic Lambda_b-Decays | Talk given by J.G. Koerner at 4th International Conference on
Hyperons, Charm and Beauty Hadrons, Valencia, Spain, 27-30 Jun 2000; 7 pages | Nucl.Phys.Proc.Suppl. 93 (2000) 13-17 | 10.1016/S0920-5632(00)01049-5 | MZ-TH/00-43, IRB-TH-11/00 | hep-ph | null | In this talk we present theoretical evidence that the exclusive/inclusive
ratio of semileptonic Lambda_b-decays exceeds that of semileptonic B-decays,
where the experimental exclusive/inclusive ratio amounts to about 66%. We start
from the observation that the spectator quark model provides a lower bound on
the leading order Isgur-Wise function of the Lambda_b -> Lambda_c transition in
terms of the corresponding B -> D,D^* mesonic Isgur-Wise function. Using
experimental data for the B -> D,D^* mesonic Isgur-Wise functions this bound is
established. Applying a QCD sum rule estimate of the Lambda_b -> Lambda_c
transition form factor which satisfy the spectator quark model bound we predict
the exclusive/inclusive ratio of semileptonic Lambda_b decay rates to lie in a
range between 0.81 and 0.89. We also provide an upper bound on the baryonic
Isgur-Wise function which is determined from the requirement that the exclusive
rate should not exceed the inclusive rate. Our pre-Osaka results are discussed
in the light of new recent preliminary experimental results on the pertinent
mesonic and baryonic form factors presented at the Osaka ICHEP 2000 Conference.
| [
{
"created": "Tue, 17 Oct 2000 15:03:01 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Koerner",
"J. G.",
""
],
[
"Melic",
"B.",
""
]
] | In this talk we present theoretical evidence that the exclusive/inclusive ratio of semileptonic Lambda_b-decays exceeds that of semileptonic B-decays, where the experimental exclusive/inclusive ratio amounts to about 66%. We start from the observation that the spectator quark model provides a lower bound on the leading order Isgur-Wise function of the Lambda_b -> Lambda_c transition in terms of the corresponding B -> D,D^* mesonic Isgur-Wise function. Using experimental data for the B -> D,D^* mesonic Isgur-Wise functions this bound is established. Applying a QCD sum rule estimate of the Lambda_b -> Lambda_c transition form factor which satisfy the spectator quark model bound we predict the exclusive/inclusive ratio of semileptonic Lambda_b decay rates to lie in a range between 0.81 and 0.89. We also provide an upper bound on the baryonic Isgur-Wise function which is determined from the requirement that the exclusive rate should not exceed the inclusive rate. Our pre-Osaka results are discussed in the light of new recent preliminary experimental results on the pertinent mesonic and baryonic form factors presented at the Osaka ICHEP 2000 Conference. |
2306.02540 | Jaseer Ahmed | Jaseer Ahmed, P. G. Blunden, W. Melnitchouk | Normal single-spin asymmetries in electron-proton scattering: two-photon
exchange with intermediate state resonances | 31 pages, 7 figures, 3 tables | null | null | JLAB-THY-23-3835, ADP-23-15/T1224 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the beam ($B_n$) and target ($A_n$) normal single-spin
asymmetries in electron-proton elastic scattering from two-photon exchange
amplitudes with resonance intermediate states of spin-parity $1/2^\pm$ and
$3/2^\pm$ and mass $W \lesssim 1.8$ GeV. The latest CLAS exclusive meson
electroproduction data are used as input for the transition amplitudes from the
proton to the excited resonance states. For $B_n$, the spin 3/2 resonances
dominate by an order of magnitude over the spin 1/2 states. In general we
observe cancellations between the negative contributions of the $\Delta(1232)$
and $N(1520)$ across both beam energy and scattering angle, and the positive
contributions of the $\Delta(1700)$ and $N(1720)$, leading to a rather large
overall uncertainty band in the total $B_n$. At forward angles and beam
energies $E_\textrm{lab}<1$ GeV, where the $\Delta(1232)$ dominates, the
calculated $B_n$ tend to overshoot the A4 and SAMPLE data. The calculated $B_n$
compare well with the measured values from the A4 and $Q_{\textrm{weak}}$
experiments with $E_\textrm{lab}>1$ GeV.
| [
{
"created": "Mon, 5 Jun 2023 02:20:56 GMT",
"version": "v1"
}
] | 2023-06-06 | [
[
"Ahmed",
"Jaseer",
""
],
[
"Blunden",
"P. G.",
""
],
[
"Melnitchouk",
"W.",
""
]
] | We calculate the beam ($B_n$) and target ($A_n$) normal single-spin asymmetries in electron-proton elastic scattering from two-photon exchange amplitudes with resonance intermediate states of spin-parity $1/2^\pm$ and $3/2^\pm$ and mass $W \lesssim 1.8$ GeV. The latest CLAS exclusive meson electroproduction data are used as input for the transition amplitudes from the proton to the excited resonance states. For $B_n$, the spin 3/2 resonances dominate by an order of magnitude over the spin 1/2 states. In general we observe cancellations between the negative contributions of the $\Delta(1232)$ and $N(1520)$ across both beam energy and scattering angle, and the positive contributions of the $\Delta(1700)$ and $N(1720)$, leading to a rather large overall uncertainty band in the total $B_n$. At forward angles and beam energies $E_\textrm{lab}<1$ GeV, where the $\Delta(1232)$ dominates, the calculated $B_n$ tend to overshoot the A4 and SAMPLE data. The calculated $B_n$ compare well with the measured values from the A4 and $Q_{\textrm{weak}}$ experiments with $E_\textrm{lab}>1$ GeV. |
hep-ph/9710470 | Sunil Mukhi | Sunil Mukhi (Tata Institute of Fundamental Research, Mumbai) | Recent Developments in String Theory: A Brief Review for Particle
Physicists | harvmac, 15 pages (b), two eps figures, Based on a talk delivered at
the XII DAE Symposium on High-Energy Physics, Guwahati, December 1996 | null | null | TIFR/TH/97-55 | hep-ph | null | At the present time, string theory (and its generalizations) remain
relatively abstruse subjects to the particle phenomenologist and
experimentalist. Yet, striking developments of the last two years offer hope
that a fundamental non-perturbative formulation of this theory will be found,
and that this formulation will permit us to make contact with supersymmetric
standard-model physics. This article is based on a talk which attempted to
convey the essence of these recent developments in string theory, in a
non-technical manner, to an audience of particle theorists, phenomenologists
and experimentalists.
| [
{
"created": "Mon, 27 Oct 1997 06:02:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mukhi",
"Sunil",
"",
"Tata Institute of Fundamental Research, Mumbai"
]
] | At the present time, string theory (and its generalizations) remain relatively abstruse subjects to the particle phenomenologist and experimentalist. Yet, striking developments of the last two years offer hope that a fundamental non-perturbative formulation of this theory will be found, and that this formulation will permit us to make contact with supersymmetric standard-model physics. This article is based on a talk which attempted to convey the essence of these recent developments in string theory, in a non-technical manner, to an audience of particle theorists, phenomenologists and experimentalists. |
1205.3683 | Alexander Korchin | Alexander Yu. Korchin, Vladimir A. Kovalchuk | Contribution of vector resonances to the {\bar B}_d^0 -> {\bar K}^{*0}
mu^+ mu^- decay | 12 pages, 4 figures, SVJour3 style; introduction and discussion
sections extended, references added; version accepted for publication in Eur.
Phys. J. C. arXiv admin note: substantial text overlap with arXiv:1111.4093 | Eur. Phys. J. C 72 (2012) 2155 | 10.1140/epjc/s10052-012-2155-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fully differential angular distribution for the rare flavor-changing
neutral current decay \bar{B}_d^0 -> \bar{K}^{*0} (-> K- pi+) mu+ mu- is
studied. The emphasis is placed on accurate treatment of the contribution from
the processes \bar{B}_d^0 -> \bar{K}^{*0} (-> K- pi+) V with intermediate
vector resonances V = rho(770), omega(782), phi(1020), J/psi, psi(2S), ...
decaying into the mu+ mu- pair. The dilepton invariant-mass dependence of the
branching ratio, longitudinal polarization fraction f_L of the \bar{K}^{*0}
meson, and forward-backward asymmetry A_{FB} is calculated and compared with
data from Belle, CDF and LHCb. It is shown that inclusion of the resonance
contribution may considerably modify the branching ratio, calculated in the SM
without resonances, even in the invariant-mass region far from the so-called
charmonia cuts applied in the experimental analyses. This conclusion crucially
depends on values of the unknown phases of the B^0 -> K^{*0} J/psi and B^0 ->
K^{*0} psi(2S) decay amplitudes with zero helicity.
| [
{
"created": "Wed, 16 May 2012 14:08:31 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2012 05:42:25 GMT",
"version": "v2"
}
] | 2012-10-03 | [
[
"Korchin",
"Alexander Yu.",
""
],
[
"Kovalchuk",
"Vladimir A.",
""
]
] | The fully differential angular distribution for the rare flavor-changing neutral current decay \bar{B}_d^0 -> \bar{K}^{*0} (-> K- pi+) mu+ mu- is studied. The emphasis is placed on accurate treatment of the contribution from the processes \bar{B}_d^0 -> \bar{K}^{*0} (-> K- pi+) V with intermediate vector resonances V = rho(770), omega(782), phi(1020), J/psi, psi(2S), ... decaying into the mu+ mu- pair. The dilepton invariant-mass dependence of the branching ratio, longitudinal polarization fraction f_L of the \bar{K}^{*0} meson, and forward-backward asymmetry A_{FB} is calculated and compared with data from Belle, CDF and LHCb. It is shown that inclusion of the resonance contribution may considerably modify the branching ratio, calculated in the SM without resonances, even in the invariant-mass region far from the so-called charmonia cuts applied in the experimental analyses. This conclusion crucially depends on values of the unknown phases of the B^0 -> K^{*0} J/psi and B^0 -> K^{*0} psi(2S) decay amplitudes with zero helicity. |
2112.08912 | Philipp Schicho | Joonas Hirvonen, Johan L\"ofgren, Michael J. Ramsey-Musolf, Philipp
Schicho and Tuomas V. I. Tenkanen | Computing the gauge-invariant bubble nucleation rate in finite
temperature effective field theory | 64 pages, 3 figures, 2 tables; v2: Journal version, added figures 1
and 2, extended sections 1 and 3.4 | null | 10.1007/JHEP07(2022)135 | ACFI-T21-16, HIP-2021-45/TH, NORDITA 2021-111 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | A gauge-invariant framework for computing bubble nucleation rates at finite
temperature in the presence of radiative barriers was presented and advocated
for model-building and phenomenological studies in an accompanying article
arXiv:2112.05472. Here, we detail this computation using the Abelian Higgs
Model as an illustrative example. Subsequently, we recast this approach in the
dimensionally-reduced high-temperature effective field theory for nucleation.
This allows for including several higher order thermal resummations and
furthermore delineate clearly the approach's limits of validity. This approach
provides for robust perturbative treatments of bubble nucleation during
possible first-order cosmic phase transitions, with implications for
electroweak baryogenesis and production of a stochastic gravitational wave
background. Furthermore, it yields a sound comparison between results of
perturbative and non-perturbative computations.
| [
{
"created": "Thu, 16 Dec 2021 14:27:38 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2022 14:16:22 GMT",
"version": "v2"
}
] | 2022-08-10 | [
[
"Hirvonen",
"Joonas",
""
],
[
"Löfgren",
"Johan",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Schicho",
"Philipp",
""
],
[
"Tenkanen",
"Tuomas V. I.",
""
]
] | A gauge-invariant framework for computing bubble nucleation rates at finite temperature in the presence of radiative barriers was presented and advocated for model-building and phenomenological studies in an accompanying article arXiv:2112.05472. Here, we detail this computation using the Abelian Higgs Model as an illustrative example. Subsequently, we recast this approach in the dimensionally-reduced high-temperature effective field theory for nucleation. This allows for including several higher order thermal resummations and furthermore delineate clearly the approach's limits of validity. This approach provides for robust perturbative treatments of bubble nucleation during possible first-order cosmic phase transitions, with implications for electroweak baryogenesis and production of a stochastic gravitational wave background. Furthermore, it yields a sound comparison between results of perturbative and non-perturbative computations. |
hep-ph/9310374 | null | D. Comelli, A. Masiero, M. Pietroni and A. Riotto | Spontaneous Breaking of R parity in the Minimal Supersymmetric Standard
Model Revisited | 10 pages, DFPD 93/TH/68, UTS-DFT-93-27, SISSA 93/168/A preprints, 2
figures available upon e-mail request | Phys.Lett. B324 (1994) 397-402 | 10.1016/0370-2693(94)90212-7 | null | hep-ph | null | We reconsider the possibility of spontaneous breaking of $R$ parity in the
Minimal Supersymmetric Standard Model. By a renormalization group analysis we
find the parameter space in which a sneutrino gets a vacuum expectation value,
leading to the spontaneous breaking of the lepton number and to the appearance
of a phenomenologically unacceptable massless Goldstone boson. We then analyze
the effect of operators giving rise to a tiny amount of explicit violation of
lepton number, which could emerge as remnants of physics at some superheavy
(Planck or GUT) scale in the low energy effective theory. We show that the
conspiracy between the spontaneous and the explicit breaking scales can provide
a mass to the Goldstone boson larger than the ${\rm Z}^0$ boson mass, hence
allowing for a non vanishing sneutrino vacuum expectation value without
increasing the invisible width of the ${\rm Z}^0$.
| [
{
"created": "Fri, 29 Oct 1993 15:36:16 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Comelli",
"D.",
""
],
[
"Masiero",
"A.",
""
],
[
"Pietroni",
"M.",
""
],
[
"Riotto",
"A.",
""
]
] | We reconsider the possibility of spontaneous breaking of $R$ parity in the Minimal Supersymmetric Standard Model. By a renormalization group analysis we find the parameter space in which a sneutrino gets a vacuum expectation value, leading to the spontaneous breaking of the lepton number and to the appearance of a phenomenologically unacceptable massless Goldstone boson. We then analyze the effect of operators giving rise to a tiny amount of explicit violation of lepton number, which could emerge as remnants of physics at some superheavy (Planck or GUT) scale in the low energy effective theory. We show that the conspiracy between the spontaneous and the explicit breaking scales can provide a mass to the Goldstone boson larger than the ${\rm Z}^0$ boson mass, hence allowing for a non vanishing sneutrino vacuum expectation value without increasing the invisible width of the ${\rm Z}^0$. |
hep-ph/9704389 | Mihir P. Worah | Mihir P. Worah | Supersymmetric Baryogenesis and Flavor Physics | PRL version. Suppression factor explicitly identified below Eq. 5.
More references added. Minor cosmetic changes in discussions. All results
unchanged | Phys.Rev.Lett. 79 (1997) 3810-3813 | 10.1103/PhysRevLett.79.3810 | SLAC-PUB-7476 | hep-ph | null | We study the flavor physics implications of baryogenesis in the Minimal
Supersymmetric Standard Model. Enhanced $B-\bar B$ mixing and $b \to s \gamma$
rates are generic to all scenarios. Depending on the origin of the CP violating
phase responsible for baryogenesis there could be a large neutron electric
dipole moment, large CP violating $D-\bar D$ mixing or CP violation in top
quark production. We discuss how the combination of these measurements with the
requirement of baryogenesis shed light on the MSSM parameter space and the
source of CP violation.
| [
{
"created": "Wed, 23 Apr 1997 22:27:51 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Sep 1997 18:57:27 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Worah",
"Mihir P.",
""
]
] | We study the flavor physics implications of baryogenesis in the Minimal Supersymmetric Standard Model. Enhanced $B-\bar B$ mixing and $b \to s \gamma$ rates are generic to all scenarios. Depending on the origin of the CP violating phase responsible for baryogenesis there could be a large neutron electric dipole moment, large CP violating $D-\bar D$ mixing or CP violation in top quark production. We discuss how the combination of these measurements with the requirement of baryogenesis shed light on the MSSM parameter space and the source of CP violation. |
hep-ph/9611202 | ChangMoh kim | Seung Woo Ham, Sun Kun Oh, and Bjong Ro Kim | The gauge boson contributions to the radiatively corrected mass of the
scalar Higgs boson in the minimal supersymmetric standard model | 10 pages (2 figures are included) | null | null | KKUCC-96 | hep-ph | null | We derive analytic formulas for the radiatively corrected mass of the scalar
Higgs boson in the framework of the minimal supersymmetric standard model
(MSSM). Since the scalar-top-quark mass in our analysis include terms
proportional to the gauge couplings in the 1-loop effective potential, the
radiatively corrected mass of the scalar Higgs boson partially contains the
gauge boson contributions. At the 1-loop level, the upper bound on the lighter
scalar Higgs boson mass can be increased about 20 GeV in favor of the partial
contributions of the gauge bosons. Thus the improved absolute upper bound on
the lighter scalar Higgs boson mass is about 150 GeV.
| [
{
"created": "Fri, 1 Nov 1996 08:01:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ham",
"Seung Woo",
""
],
[
"Oh",
"Sun Kun",
""
],
[
"Kim",
"Bjong Ro",
""
]
] | We derive analytic formulas for the radiatively corrected mass of the scalar Higgs boson in the framework of the minimal supersymmetric standard model (MSSM). Since the scalar-top-quark mass in our analysis include terms proportional to the gauge couplings in the 1-loop effective potential, the radiatively corrected mass of the scalar Higgs boson partially contains the gauge boson contributions. At the 1-loop level, the upper bound on the lighter scalar Higgs boson mass can be increased about 20 GeV in favor of the partial contributions of the gauge bosons. Thus the improved absolute upper bound on the lighter scalar Higgs boson mass is about 150 GeV. |
1601.03386 | Yu-Jie Zhang Dr. | Guang-Zhi Xu, Yue Qiu, Cheng-Ping Shen, and Yu-Jie Zhang | $B^*_{s,d} \to \mu^+ \mu^-$ and its impact on $B_{s,d} \to \mu^+ \mu^-$ | Comments and suggestions are welcome | null | 10.1140/epjc/s10052-016-4423-z | null | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | The decay of $B^*_{s,d} \to \mu^+ \mu^-$~ and its impact on $B_{s,d} \to
\mu^+ \mu^-$ is studied here. The $ \mu^+ \mu^-$ decay widths of vector mesons
$B^*_{s,d}$ are about a factor of 700 larger than the corresponding scalar
mesons $B_{s,d}$. The obtained ratio of the branching fractions
$Br({B_{s,d}^*\to \mu^+\mu^-})/{Br({B_{s,d}\to\mu^+\mu^-})}$ is about
$\frac{0.3 \times {\rm eV}}{{\Gamma(B^*_{s,d} \to B_{s,d} \gamma)}}$. At the
same time, the hadronic contribution $B_{s,d} \to B^*_{s,d} \gamma \to \mu^+
\mu^-$ is estimated too. The relative increase of the amplitude of $B_{s,d}\to
\mu^+\mu^-$ is about $(0.01\pm 0.006) \sqrt{\frac{{\Gamma(B^*_{s,d} \to B_{s,d}
\gamma)}}{{100~ {\rm eV}}}}$. If we choose $\Gamma(B^*_{s,d} \to B_{s,d}
\gamma)=2~$eV, the branching fractions of the vector mesons to lepton pair are
$(6.2 \pm 0.6) \times 10^{-10}$ and $(1.7 \pm 0.2) \times 10^{-11}$ for
$B^*_{s}$ and $B^*_{d}$ respectively. If we choose $\Gamma(B^*_{s,d} \to
B_{s,d} \gamma)=200~$eV, the updated branching fractions of the scalar mesons
to muon pair are $(3.78 \pm 0.25)\times 10^{-9}$ and $(1.09 \pm 0.09)\times
10^{-10}$ for $B_{s}$ and $B_{d}$ respectively. Further studies on $B^*_{s,d}$
are usefully here, including dielectron decay, two-body decay with $J/\psi$,
and so on.
| [
{
"created": "Mon, 21 Dec 2015 23:08:42 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 2016 20:56:28 GMT",
"version": "v2"
}
] | 2016-11-23 | [
[
"Xu",
"Guang-Zhi",
""
],
[
"Qiu",
"Yue",
""
],
[
"Shen",
"Cheng-Ping",
""
],
[
"Zhang",
"Yu-Jie",
""
]
] | The decay of $B^*_{s,d} \to \mu^+ \mu^-$~ and its impact on $B_{s,d} \to \mu^+ \mu^-$ is studied here. The $ \mu^+ \mu^-$ decay widths of vector mesons $B^*_{s,d}$ are about a factor of 700 larger than the corresponding scalar mesons $B_{s,d}$. The obtained ratio of the branching fractions $Br({B_{s,d}^*\to \mu^+\mu^-})/{Br({B_{s,d}\to\mu^+\mu^-})}$ is about $\frac{0.3 \times {\rm eV}}{{\Gamma(B^*_{s,d} \to B_{s,d} \gamma)}}$. At the same time, the hadronic contribution $B_{s,d} \to B^*_{s,d} \gamma \to \mu^+ \mu^-$ is estimated too. The relative increase of the amplitude of $B_{s,d}\to \mu^+\mu^-$ is about $(0.01\pm 0.006) \sqrt{\frac{{\Gamma(B^*_{s,d} \to B_{s,d} \gamma)}}{{100~ {\rm eV}}}}$. If we choose $\Gamma(B^*_{s,d} \to B_{s,d} \gamma)=2~$eV, the branching fractions of the vector mesons to lepton pair are $(6.2 \pm 0.6) \times 10^{-10}$ and $(1.7 \pm 0.2) \times 10^{-11}$ for $B^*_{s}$ and $B^*_{d}$ respectively. If we choose $\Gamma(B^*_{s,d} \to B_{s,d} \gamma)=200~$eV, the updated branching fractions of the scalar mesons to muon pair are $(3.78 \pm 0.25)\times 10^{-9}$ and $(1.09 \pm 0.09)\times 10^{-10}$ for $B_{s}$ and $B_{d}$ respectively. Further studies on $B^*_{s,d}$ are usefully here, including dielectron decay, two-body decay with $J/\psi$, and so on. |
hep-ph/9505232 | Chi-Yee Cheung | Chi-Yee Cheung, Wei-Min Zhang, and Guey-lin Lin | Light-Front Heavy Quark Effective Theory and Heavy Meson Bound States | 23 pages, Revtex, no figures | Phys.Rev. D52 (1995) 2915-2925 | 10.1103/PhysRevD.52.2915 | IP-ASTP-05-95 | hep-ph | null | The heavy quark effective theory is developed on the light-front. Based on
this effective theory, a light-front heavy meson bound state with definite spin
and parity is constructed. Within the effective theory, the Isgur-Wise function
is derived in terms of the asymptotic light-front bound state amplitudes in the
limit $m_Q\rightarrow\infty$; the result is a general expression for arbitrary
recoil velocities. With the asymptotic form of the BSW amplitudes, the
Isgur-Wise function is given by $\xi(v\cdot v')=1/v\cdot v'$. The slope at the
zero-recoil point is $\rho^2=-\xi'(1)=1$, in excellent agreement with the
recent CLEO result of $\rho^2=1.01\pm0.15\pm0.09$.
| [
{
"created": "Thu, 4 May 1995 14:41:07 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Cheung",
"Chi-Yee",
""
],
[
"Zhang",
"Wei-Min",
""
],
[
"Lin",
"Guey-lin",
""
]
] | The heavy quark effective theory is developed on the light-front. Based on this effective theory, a light-front heavy meson bound state with definite spin and parity is constructed. Within the effective theory, the Isgur-Wise function is derived in terms of the asymptotic light-front bound state amplitudes in the limit $m_Q\rightarrow\infty$; the result is a general expression for arbitrary recoil velocities. With the asymptotic form of the BSW amplitudes, the Isgur-Wise function is given by $\xi(v\cdot v')=1/v\cdot v'$. The slope at the zero-recoil point is $\rho^2=-\xi'(1)=1$, in excellent agreement with the recent CLEO result of $\rho^2=1.01\pm0.15\pm0.09$. |
2110.08017 | Emmet Byrne | Emmet P. Byrne | Logarithmic corrections for jet production at the LHC | Proceedings of 50th International Symposium on Multiparticle Dynamics
(ISMD2021) | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Several important processes and analyses at the LHC are sensitive to
higher-order perturbative corrections beyond what can currently be calculated
at fixed order. One important class of logarithmic corrections are those which
appear when the centre-of-mass energy of a QCD collision is much larger than
the transverse momenta of the observed jets. We describe the High Energy Jets
(HEJ) framework, which includes the dominant high-energy logarithms to provide
all-order predictions for several LHC processes including Higgs, $W$, or $Z$
boson production in association with jets. We will summarise some recent
developments, in particular the first matching of HEJ to a NLO calculation.
| [
{
"created": "Fri, 15 Oct 2021 11:27:33 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2022 11:03:19 GMT",
"version": "v2"
}
] | 2022-02-04 | [
[
"Byrne",
"Emmet P.",
""
]
] | Several important processes and analyses at the LHC are sensitive to higher-order perturbative corrections beyond what can currently be calculated at fixed order. One important class of logarithmic corrections are those which appear when the centre-of-mass energy of a QCD collision is much larger than the transverse momenta of the observed jets. We describe the High Energy Jets (HEJ) framework, which includes the dominant high-energy logarithms to provide all-order predictions for several LHC processes including Higgs, $W$, or $Z$ boson production in association with jets. We will summarise some recent developments, in particular the first matching of HEJ to a NLO calculation. |
2306.16449 | Zachary Polonsky | Jason Aebischer, Marko Pesut, Zachary Polonsky | Renormalization scheme factorization of one-loop Fierz identities | 28 pages, 2 figures Updated to match published version | null | 10.1007/JHEP01(2024)060 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a proof of the factorization of renormalization scheme in
one-loop-corrected Fierz identities. This scheme factorization facilitates the
simultaneous transformation of operator basis and renormalization scheme using
only relations between physical operators; the evanescent operators in the
respective bases may be chosen entirely independently of each other. The
relations between evanescent operators in the two bases is automatically
accounted for by the corrected Fierz identities. We illustrate the utility of
this result with a two-loop anomalous dimension matrix computation using the
Naive-Dimensional Regularization scheme, which is then transformed via one-loop
Fierz identities to the known result in the literature given in a different
basis and calculated in the Larin scheme. Additionally, we reproduce results
from the literature of basis transformations involving the rotation of
evanescent operators into the physical basis using our method, without the need
to explicitly compute one-loop matrix elements of evanescent operators.
| [
{
"created": "Wed, 28 Jun 2023 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jun 2024 11:48:19 GMT",
"version": "v2"
}
] | 2024-06-12 | [
[
"Aebischer",
"Jason",
""
],
[
"Pesut",
"Marko",
""
],
[
"Polonsky",
"Zachary",
""
]
] | We present a proof of the factorization of renormalization scheme in one-loop-corrected Fierz identities. This scheme factorization facilitates the simultaneous transformation of operator basis and renormalization scheme using only relations between physical operators; the evanescent operators in the respective bases may be chosen entirely independently of each other. The relations between evanescent operators in the two bases is automatically accounted for by the corrected Fierz identities. We illustrate the utility of this result with a two-loop anomalous dimension matrix computation using the Naive-Dimensional Regularization scheme, which is then transformed via one-loop Fierz identities to the known result in the literature given in a different basis and calculated in the Larin scheme. Additionally, we reproduce results from the literature of basis transformations involving the rotation of evanescent operators into the physical basis using our method, without the need to explicitly compute one-loop matrix elements of evanescent operators. |
1706.01071 | Sibo Zheng | Sibo Zheng | Effective Higgs Theories in Supersymmetric Grand Unification | 9 pages, references added | Eur. Phys. J. C77 (2017) 588 | 10.1140/epjc/s10052-017-5174-1 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The effective Higgs theories at the TeV scale in supersymmetric $SU(5)$ grand
unification models are systematically derived. Restricted to extensions on
$\mathbf{5}_{H}$ containing the Higgs sector we show that only two types of
real (vector-like) models and one type of chiral model are found to be
consistent with perturbative grand unification. While the chiral model has been
excluded by the LHC data, the fate of perturbative unification will be uniquely
determined by the two classes of vector-like models.
| [
{
"created": "Sun, 4 Jun 2017 13:24:53 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Aug 2017 11:38:13 GMT",
"version": "v2"
}
] | 2017-09-08 | [
[
"Zheng",
"Sibo",
""
]
] | The effective Higgs theories at the TeV scale in supersymmetric $SU(5)$ grand unification models are systematically derived. Restricted to extensions on $\mathbf{5}_{H}$ containing the Higgs sector we show that only two types of real (vector-like) models and one type of chiral model are found to be consistent with perturbative grand unification. While the chiral model has been excluded by the LHC data, the fate of perturbative unification will be uniquely determined by the two classes of vector-like models. |
2105.13869 | Felix Karbstein | Felix Karbstein, Chantal Sundqvist, Kai S. Schulze, Ingo Uschmann,
Holger Gies, Gerhard G. Paulus | Vacuum birefringence at x-ray free-electron lasers | 26 pages, 2 figures; matches journal version | New J. Phys. 23 095001(2021) | 10.1088/1367-2630/ac1df4 | null | hep-ph physics.optics quant-ph | http://creativecommons.org/licenses/by/4.0/ | We study the perspectives of measuring the phenomenon of vacuum birefringence
predicted by quantum electrodynamics using an x-ray free-electron laser (XFEL)
alone. We devise an experimental scheme allowing the XFEL beam to collide with
itself under a finite angle, and thus act as both pump and probe field for the
effect. The signature of vacuum birefringence is encoded in
polarization-flipped signal photons to be detected with high-purity x-ray
polarimetry. Our findings for idealized scenarios underline that the discovery
potential of solely XFEL-based setups can be comparable to those involving
optical high-intensity lasers. For currently achievable scenarios, we identify
several key details of the x-ray optical ingredients that exert a strong
influence on the magnitude of the desired signatures.
| [
{
"created": "Fri, 28 May 2021 14:25:50 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Aug 2021 12:16:32 GMT",
"version": "v2"
}
] | 2021-09-02 | [
[
"Karbstein",
"Felix",
""
],
[
"Sundqvist",
"Chantal",
""
],
[
"Schulze",
"Kai S.",
""
],
[
"Uschmann",
"Ingo",
""
],
[
"Gies",
"Holger",
""
],
[
"Paulus",
"Gerhard G.",
""
]
] | We study the perspectives of measuring the phenomenon of vacuum birefringence predicted by quantum electrodynamics using an x-ray free-electron laser (XFEL) alone. We devise an experimental scheme allowing the XFEL beam to collide with itself under a finite angle, and thus act as both pump and probe field for the effect. The signature of vacuum birefringence is encoded in polarization-flipped signal photons to be detected with high-purity x-ray polarimetry. Our findings for idealized scenarios underline that the discovery potential of solely XFEL-based setups can be comparable to those involving optical high-intensity lasers. For currently achievable scenarios, we identify several key details of the x-ray optical ingredients that exert a strong influence on the magnitude of the desired signatures. |
1708.08503 | Jared Evans | Jared A. Evans | Detecting Hidden Particles with MATHUSLA | 5 pages, 4 figures; References added, minor changes | Phys. Rev. D 97, 055046 (2018) | 10.1103/PhysRevD.97.055046 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A hidden sector containing light long-lived particles provides a
well-motivated place to find new physics. The recently proposed MATHUSLA
experiment has the potential to be extremely sensitive to light particles
originating from rare meson decays in the very long lifetime region. In this
work, we illustrate this strength with the specific example of a light scalar
mixed with the standard model-like Higgs boson, a model where MATHUSLA can
further probe unexplored parameter space from exotic Higgs decays. Design
augmentations should be considered in order to maximize the ability of MATHUSLA
to discover very light hidden sector particles.
| [
{
"created": "Mon, 28 Aug 2017 19:49:11 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2017 20:23:06 GMT",
"version": "v2"
}
] | 2018-04-04 | [
[
"Evans",
"Jared A.",
""
]
] | A hidden sector containing light long-lived particles provides a well-motivated place to find new physics. The recently proposed MATHUSLA experiment has the potential to be extremely sensitive to light particles originating from rare meson decays in the very long lifetime region. In this work, we illustrate this strength with the specific example of a light scalar mixed with the standard model-like Higgs boson, a model where MATHUSLA can further probe unexplored parameter space from exotic Higgs decays. Design augmentations should be considered in order to maximize the ability of MATHUSLA to discover very light hidden sector particles. |
hep-ph/9703215 | Janusz Gluza | J. Gluza (Un. of Silesia), J. Maalampi (Un. of Helsinki), M. Raidal
(Un. of Valencia and IFIC) and M. Zralek (Un. of Silesia) | Heavy neutrino mixing and single production at Linear Collider | latex, 14 pages, 4 ps files | Phys.Lett. B407 (1997) 45-52 | 10.1016/S0370-2693(97)00713-2 | TP-USL/97/15, FTUV/96-24 | hep-ph | null | We study the single production of heavy neutrinos via the processes $e^-e^+
\to \nu N$ and $e^-\gamma \to W^- N$ at future linear colliders. As a base of
our considerations we take a wide class of models, both with vanishing and
non-vanishing left-handed Majorana neutrino mass matrix $m_L$. We perform a
model independent analyses of the existing experimental data and find
connections between the characteristic of heavy neutrinos (masses, mixings, CP
eigenvalues) and the $m_L$ parameters. We show that with the present
experimental constraints heavy neutrino masses almost up to the collision
energy can be tested in the future experiments.
| [
{
"created": "Mon, 3 Mar 1997 09:48:44 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Gluza",
"J.",
"",
"Un. of Silesia"
],
[
"Maalampi",
"J.",
"",
"Un. of Helsinki"
],
[
"Raidal",
"M.",
"",
"Un. of Valencia and IFIC"
],
[
"Zralek",
"M.",
"",
"Un. of Silesia"
]
] | We study the single production of heavy neutrinos via the processes $e^-e^+ \to \nu N$ and $e^-\gamma \to W^- N$ at future linear colliders. As a base of our considerations we take a wide class of models, both with vanishing and non-vanishing left-handed Majorana neutrino mass matrix $m_L$. We perform a model independent analyses of the existing experimental data and find connections between the characteristic of heavy neutrinos (masses, mixings, CP eigenvalues) and the $m_L$ parameters. We show that with the present experimental constraints heavy neutrino masses almost up to the collision energy can be tested in the future experiments. |
1708.00912 | Valerio Bertone Dr | Valerio Bertone | The photon PDF from high-mass Drell-Yan data at the LHC | 8 pages, 6 figures, Proceedings of the PHOTON'17 workshop | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present a determination of the photon PDF from a fit to the recent ATLAS
measurements of high-mass Drell-Yan lepton-pair production at $\sqrt{s} = 8$
TeV. This analysis is based on the {\tt xFitter} framework interfaced to the
{\tt APFEL} program, that accounts for NLO QED effects, and to the {\tt
aMCfast} code to account for the photon-initiated contributions within {\tt
MadGraph5\_aMC@NLO}. The result is compared with other recent determinations of
the photon PDF finding a general good agreement.
| [
{
"created": "Wed, 2 Aug 2017 20:00:18 GMT",
"version": "v1"
}
] | 2017-08-04 | [
[
"Bertone",
"Valerio",
""
]
] | I present a determination of the photon PDF from a fit to the recent ATLAS measurements of high-mass Drell-Yan lepton-pair production at $\sqrt{s} = 8$ TeV. This analysis is based on the {\tt xFitter} framework interfaced to the {\tt APFEL} program, that accounts for NLO QED effects, and to the {\tt aMCfast} code to account for the photon-initiated contributions within {\tt MadGraph5\_aMC@NLO}. The result is compared with other recent determinations of the photon PDF finding a general good agreement. |
1605.07192 | Simone Alioli | Simone Alioli, Christian W. Bauer, Sam Guns and Frank J. Tackmann | Underlying event sensitive observables in Drell-Yan production using
GENEVA | 23 pages, 11 figures. v3: version accepted by EPJC | Eur.Phys.J. C76 (2016) no.11, 614 | 10.1140/epjc/s10052-016-4458-1 | null | hep-ph hep-ex | http://creativecommons.org/publicdomain/zero/1.0/ | We present an extension of the GENEVA Monte Carlo framework to include
multiple parton interactions (MPI) provided by PYTHIA8. This allows us to
obtain predictions for underlying-event sensitive measurements in Drell-Yan
production, in conjunction with GENEVA's fully-differential NNLO calculation,
NNLL' resummation for the 0-jet resolution variable (beam thrust), and NLL
resummation for the 1-jet resolution variable. We describe the interface with
the parton shower algorithm and MPI model of PYTHIA8, which preserves both the
precision of partonic N-jet cross sections in GENEVA as well as the shower
accuracy and good description of soft hadronic physics of PYTHIA8. We present
results for several underlying-event sensitive observables and compare to data
from ATLAS and CMS as well as to standalone PYTHIA8 predictions. This includes
a comparison with the recent ATLAS measurement of the beam thrust spectrum,
which provides a potential avenue to fully disentangle the physical effects
from the primary hard interaction, primary soft radiation, multiple parton
interactions, and nonperturbative hadronization.
| [
{
"created": "Mon, 23 May 2016 20:00:17 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Sep 2016 16:47:37 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Mar 2017 17:12:21 GMT",
"version": "v3"
}
] | 2017-03-16 | [
[
"Alioli",
"Simone",
""
],
[
"Bauer",
"Christian W.",
""
],
[
"Guns",
"Sam",
""
],
[
"Tackmann",
"Frank J.",
""
]
] | We present an extension of the GENEVA Monte Carlo framework to include multiple parton interactions (MPI) provided by PYTHIA8. This allows us to obtain predictions for underlying-event sensitive measurements in Drell-Yan production, in conjunction with GENEVA's fully-differential NNLO calculation, NNLL' resummation for the 0-jet resolution variable (beam thrust), and NLL resummation for the 1-jet resolution variable. We describe the interface with the parton shower algorithm and MPI model of PYTHIA8, which preserves both the precision of partonic N-jet cross sections in GENEVA as well as the shower accuracy and good description of soft hadronic physics of PYTHIA8. We present results for several underlying-event sensitive observables and compare to data from ATLAS and CMS as well as to standalone PYTHIA8 predictions. This includes a comparison with the recent ATLAS measurement of the beam thrust spectrum, which provides a potential avenue to fully disentangle the physical effects from the primary hard interaction, primary soft radiation, multiple parton interactions, and nonperturbative hadronization. |
hep-ph/9502245 | Joerg Schaldach | D.Diakonov, M.Polyakov, P.Sieber, J.Schaldach, K.Goeke | Sphaleron transitions in the Minimal Standard Model and the upper bound
for the Higgs Mass | 49 pages, 5 figures (uuencoded PostScript); fixing of the
renormalization scale has been improved, numerics has been extended | Phys.Rev. D53 (1996) 3366-3391 | 10.1103/PhysRevD.53.3366 | RUB-TPII-25/95 | hep-ph | null | We calculate the dissipation of the baryon number after the electroweak phase
transition due to thermal fluctuations above the sphaleron barrier. We consider
not only the classical Boltzmann factor but also fermionic and bosonic one-loop
contributions. We find that both bosonic and especially fermionic fluctuations
can considerably suppress the transition rate. Assuming the Langer--Affleck
formalism for this rate, the condition that an initial baryon asymmetry must
not be washed out by sphaleron transitions leads, in the Minimal Standard Model
($\sin\theta_W=0$), to an upper bound for the Higgs mass in the range 60 to 75
GeV.
| [
{
"created": "Tue, 7 Feb 1995 15:33:01 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jul 1995 12:42:27 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Diakonov",
"D.",
""
],
[
"Polyakov",
"M.",
""
],
[
"Sieber",
"P.",
""
],
[
"Schaldach",
"J.",
""
],
[
"Goeke",
"K.",
""
]
] | We calculate the dissipation of the baryon number after the electroweak phase transition due to thermal fluctuations above the sphaleron barrier. We consider not only the classical Boltzmann factor but also fermionic and bosonic one-loop contributions. We find that both bosonic and especially fermionic fluctuations can considerably suppress the transition rate. Assuming the Langer--Affleck formalism for this rate, the condition that an initial baryon asymmetry must not be washed out by sphaleron transitions leads, in the Minimal Standard Model ($\sin\theta_W=0$), to an upper bound for the Higgs mass in the range 60 to 75 GeV. |
2312.13952 | Tulio Eduardo Restrepo Medina | Eduardo S. Fraga and Let\'icia F. Palhares and Tulio E. Restrepo | Cold and dense perturbative QCD in a very strong magnetic background | 14 pages, 8 figures | Eduardo S. Fraga, Let\'icia F. Palhares, and Tulio E. Restrepo,
Phys.Rev.D 109 (2024) 5, 054033 | 10.1103/PhysRevD.109.054033 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We compute the pressure from first principles within perturbative QCD at
finite baryon density and very high magnetic fields up to two-loops and with
physical quark masses. The region of validity for our framework is given by
$m_s \ll \mu_q \ll \sqrt{eB}$, where $m_s$ is the strange quark mass, $\mu_q$
is the quark chemical potential, $e$ is the fundamental electric charge, and
$B$ is the magnetic field strength. We include the effects of the
renormalization scale in the running coupling, $\alpha_s (\mu_q,\sqrt{eB})$,
and running strange quark mass. We also discuss the simplifications that come
about in the chiral limit. The effectively negligible contribution of the
exchange diagram allows for building a simple analytic model for the equation
of state for pure quark magnetars and computing their mass and radius at very
large values of $B$. These results provide constraints on the behavior of the
maximum mass and associated radius from perturbative QCD. We also discuss the
magnetic bag model for extreme magnetic fields.
| [
{
"created": "Thu, 21 Dec 2023 15:40:04 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2024 15:44:08 GMT",
"version": "v2"
}
] | 2024-03-29 | [
[
"Fraga",
"Eduardo S.",
""
],
[
"Palhares",
"Letícia F.",
""
],
[
"Restrepo",
"Tulio E.",
""
]
] | We compute the pressure from first principles within perturbative QCD at finite baryon density and very high magnetic fields up to two-loops and with physical quark masses. The region of validity for our framework is given by $m_s \ll \mu_q \ll \sqrt{eB}$, where $m_s$ is the strange quark mass, $\mu_q$ is the quark chemical potential, $e$ is the fundamental electric charge, and $B$ is the magnetic field strength. We include the effects of the renormalization scale in the running coupling, $\alpha_s (\mu_q,\sqrt{eB})$, and running strange quark mass. We also discuss the simplifications that come about in the chiral limit. The effectively negligible contribution of the exchange diagram allows for building a simple analytic model for the equation of state for pure quark magnetars and computing their mass and radius at very large values of $B$. These results provide constraints on the behavior of the maximum mass and associated radius from perturbative QCD. We also discuss the magnetic bag model for extreme magnetic fields. |
2205.12234 | Paolo Cea | Paolo Cea | The Higgs condensate as a quantum liquid: Comparison with the full Run 2
CMS data | 10 pages, 2 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare our proposal for an additional heavy Standard Model Higgs boson to
the available full data set collected by the CMS detector during Run 2 at the
Large Hadron Collider (LHC) corresponding to an integrated luminosity of 138
fb$^{-1}$. The CMS Collaboration performed a search for a high mass Higgs boson
decaying into a pair of W bosons in the dileptonic channel. Our analysis of the
CMS data indicated the presence of a broad excess in the mass range 600 GeV -
800 GeV with respect to the expected Standard Model background with a rather
significative statistical significance. We found that our theoretical proposal
is in reasonable agreement with the experimental observations.
| [
{
"created": "Tue, 24 May 2022 17:42:05 GMT",
"version": "v1"
}
] | 2022-05-26 | [
[
"Cea",
"Paolo",
""
]
] | We compare our proposal for an additional heavy Standard Model Higgs boson to the available full data set collected by the CMS detector during Run 2 at the Large Hadron Collider (LHC) corresponding to an integrated luminosity of 138 fb$^{-1}$. The CMS Collaboration performed a search for a high mass Higgs boson decaying into a pair of W bosons in the dileptonic channel. Our analysis of the CMS data indicated the presence of a broad excess in the mass range 600 GeV - 800 GeV with respect to the expected Standard Model background with a rather significative statistical significance. We found that our theoretical proposal is in reasonable agreement with the experimental observations. |
1503.05483 | Steven D. Bass | Steven D. Bass | Vacuum energy and the cosmological constant | 15 pages, Contributed paper to the Special Issue "Fundamental
Constants in Physics and Their Time Variation" (Modern Physics Letters A,
Guest Editor Joan Sol\`a) | Mod.Phys.Lett. A30 (2015) 1540033 | 10.1142/S0217732315400337 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The accelerating expansion of the Universe points to a small positive value
for the cosmological constant or vacuum energy density. We discuss recent ideas
that the cosmological constant plus LHC results might hint at critical
phenomena near the Planck scale.
| [
{
"created": "Wed, 18 Mar 2015 16:47:03 GMT",
"version": "v1"
}
] | 2015-07-09 | [
[
"Bass",
"Steven D.",
""
]
] | The accelerating expansion of the Universe points to a small positive value for the cosmological constant or vacuum energy density. We discuss recent ideas that the cosmological constant plus LHC results might hint at critical phenomena near the Planck scale. |
1907.01416 | Akira Watanabe | Akira Watanabe | Differential and total cross sections of high energy proton-proton
scattering in holographic QCD | 6 pages, 2 figures, prepared for the proceedings of the XXVII
International Workshop on Deep Inelastic Scattering and Related Subjects
(DIS2019), 8 - 12 April 2019, Torino, Italy | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analysis on the high energy proton-proton scattering is presented,
focusing on the Regge regime and considering the Pomeron exchange to describe
the involved nonperturbative dynamics in the framework of holographic QCD. We
combine the Reggeized spin-2 particle propagator and the proton gravitational
form factor, which is obtained from the bottom-up AdS/QCD model, and calculate
the differential and total cross sections. We explicitly demonstrate the
comparison between our calculations and the currently available experimental
data including the recent ones measured at $\sqrt{s} = 13$ TeV by the TOTEM
collaboration at the LHC. It is shown that our results are consistent with the
data, which implies that the present framework works in the considered TeV
scale.
| [
{
"created": "Tue, 2 Jul 2019 14:52:20 GMT",
"version": "v1"
}
] | 2019-07-03 | [
[
"Watanabe",
"Akira",
""
]
] | The analysis on the high energy proton-proton scattering is presented, focusing on the Regge regime and considering the Pomeron exchange to describe the involved nonperturbative dynamics in the framework of holographic QCD. We combine the Reggeized spin-2 particle propagator and the proton gravitational form factor, which is obtained from the bottom-up AdS/QCD model, and calculate the differential and total cross sections. We explicitly demonstrate the comparison between our calculations and the currently available experimental data including the recent ones measured at $\sqrt{s} = 13$ TeV by the TOTEM collaboration at the LHC. It is shown that our results are consistent with the data, which implies that the present framework works in the considered TeV scale. |
1207.6642 | Alexander Friedland | Alexander Friedland and Ian M. Shoemaker | Searching for Novel Neutrino Interactions at NOvA and Beyond in Light of
Large theta_13 | 10 pages, 8 figures | null | null | LA-UR-12-22243 | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the prospects of probing nonstandard interactions (NSI) of
neutrinos in the e-tau sector with upcoming long-baseline nu_mu -> nu_e
oscillation experiments. First conjectured decades ago, neutrino NSI remain of
great interest, especially in light of the recent 8B solar neutrino
measurements by SNO, Super-Kamiokande, and Borexino. We observe that the recent
discovery of large theta_13 implies that long-baseline experiments have
considerable NSI sensitivity, thanks to the interference of the standard and
new physics conversion amplitudes. In particular, in some parts of NSI
parameter space, the upcoming NOvA experiment will be sensitive enough to see ~
3sigma deviations from the SM-only hypothesis. On the flip side, NSI introduce
important ambiguities in interpreting NOvA results as measurements of
CP-violation, the mass hierarchy and the octant of theta_23. In particular,
observed CP violation could be due to a phase coming from NSI, rather than the
vacuum Hamiltonian. The proposed LBNE experiment, with its longer ~ 1300 km
baseline, may break many of these interpretative degeneracies.
| [
{
"created": "Fri, 27 Jul 2012 20:05:21 GMT",
"version": "v1"
}
] | 2012-07-31 | [
[
"Friedland",
"Alexander",
""
],
[
"Shoemaker",
"Ian M.",
""
]
] | We examine the prospects of probing nonstandard interactions (NSI) of neutrinos in the e-tau sector with upcoming long-baseline nu_mu -> nu_e oscillation experiments. First conjectured decades ago, neutrino NSI remain of great interest, especially in light of the recent 8B solar neutrino measurements by SNO, Super-Kamiokande, and Borexino. We observe that the recent discovery of large theta_13 implies that long-baseline experiments have considerable NSI sensitivity, thanks to the interference of the standard and new physics conversion amplitudes. In particular, in some parts of NSI parameter space, the upcoming NOvA experiment will be sensitive enough to see ~ 3sigma deviations from the SM-only hypothesis. On the flip side, NSI introduce important ambiguities in interpreting NOvA results as measurements of CP-violation, the mass hierarchy and the octant of theta_23. In particular, observed CP violation could be due to a phase coming from NSI, rather than the vacuum Hamiltonian. The proposed LBNE experiment, with its longer ~ 1300 km baseline, may break many of these interpretative degeneracies. |
hep-ph/0108103 | Matthias Neubert | Matthias Neubert, Alexey A. Petrov (Cornell University) | Comments on Color-Suppressed Hadronic B Decays | 9 pages, 2 figures | Phys.Lett. B519 (2001) 50-56 | 10.1016/S0370-2693(01)01093-0 | CLNS 01/1753 | hep-ph | null | Recent experimental results on the color-suppressed nonleptonic decays B^0 ->
D^{(*)0} pi^0 provide evidence for a failure of the naive factorization model
and for sizeable relative strong-interaction phases between class-1 and class-2
B -> D^(*) pi decay amplitudes. The allowed regions for the corresponding
ratios of (complex) isospin amplitudes and a_2/a_1 parameters are determined.
The results are interpreted in the context of QCD factorization for the related
class-1 amplitudes in the heavy-quark limit.
| [
{
"created": "Fri, 10 Aug 2001 20:15:23 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Neubert",
"Matthias",
"",
"Cornell University"
],
[
"Petrov",
"Alexey A.",
"",
"Cornell University"
]
] | Recent experimental results on the color-suppressed nonleptonic decays B^0 -> D^{(*)0} pi^0 provide evidence for a failure of the naive factorization model and for sizeable relative strong-interaction phases between class-1 and class-2 B -> D^(*) pi decay amplitudes. The allowed regions for the corresponding ratios of (complex) isospin amplitudes and a_2/a_1 parameters are determined. The results are interpreted in the context of QCD factorization for the related class-1 amplitudes in the heavy-quark limit. |
0905.3056 | Stefano Morisi | M.Hirsch, S.Morisi, J.W.F.Valle | A4-based tri-bimaximal mixing within inverse and linear seesaw schemes | 8 pages, 3 figures. Experimental references added and figure 1
updated | Phys.Lett.B679:454-459,2009 | 10.1016/j.physletb.2009.08.003 | IFIC/09-19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider tri-bimaximal lepton mixing within low-scale seesaw schemes where
light neutrino masses arise from TeV scale physics, potentially accessible at
the Large Hadron Collider (LHC). Two examples are considered, based on the A4
flavor symmetry realized within the inverse or the linear seesaw mechanisms.
Both are highly predictive so that in both the light neutrino sector
effectively depends only on three mass parameters and one Majorana phase, with
no CP violation in neutrino oscillations. We find that the linear seesaw leads
to a lower bound for neutrinoless double beta decay while the inverse seesaw
does not. The models also lead to potentially sizeable decay rates for lepton
flavor violating processes, tightly related by the assumed flavor symmetry.
| [
{
"created": "Tue, 19 May 2009 12:32:35 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2009 13:11:24 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"Hirsch",
"M.",
""
],
[
"Morisi",
"S.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We consider tri-bimaximal lepton mixing within low-scale seesaw schemes where light neutrino masses arise from TeV scale physics, potentially accessible at the Large Hadron Collider (LHC). Two examples are considered, based on the A4 flavor symmetry realized within the inverse or the linear seesaw mechanisms. Both are highly predictive so that in both the light neutrino sector effectively depends only on three mass parameters and one Majorana phase, with no CP violation in neutrino oscillations. We find that the linear seesaw leads to a lower bound for neutrinoless double beta decay while the inverse seesaw does not. The models also lead to potentially sizeable decay rates for lepton flavor violating processes, tightly related by the assumed flavor symmetry. |
1305.5739 | Stefano Bertolini | Stefano Bertolini, Alessio Maiezza, Fabrizio Nesti | K to \pi\pi\ hadronic matrix elements of left-right current-current
operators | Minor text changes. To appear on Phys. Rev. D | null | 10.1103/PhysRevD.88.034014 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effective \Delta S=1 four fermion operators involving left- and right-handed
currents are relevant in left-right gauge extensions of the standard model and
scalar extension of the Yukawa sector. They induce K to \pi\pi\ decays which
are strictly constrained by experimental data, typically resulting in strong
bounds on the new physics scales or parameters. We evaluate the K to \pi\pi\
hadronic matrix elements of such operators within the phenomenological
framework of the Chiral Quark Model. The results are consistent with the
estimates used in a previous work on TeV scale left-right symmetry, thus
confirming the conclusions obtained there.
| [
{
"created": "Fri, 24 May 2013 14:02:41 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Aug 2013 12:12:25 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Bertolini",
"Stefano",
""
],
[
"Maiezza",
"Alessio",
""
],
[
"Nesti",
"Fabrizio",
""
]
] | Effective \Delta S=1 four fermion operators involving left- and right-handed currents are relevant in left-right gauge extensions of the standard model and scalar extension of the Yukawa sector. They induce K to \pi\pi\ decays which are strictly constrained by experimental data, typically resulting in strong bounds on the new physics scales or parameters. We evaluate the K to \pi\pi\ hadronic matrix elements of such operators within the phenomenological framework of the Chiral Quark Model. The results are consistent with the estimates used in a previous work on TeV scale left-right symmetry, thus confirming the conclusions obtained there. |
1908.00376 | Dibyakrupa Sahoo | C. S. Kim, Youngjoon Kwon, Donghun Lee, Sechul Oh and Dibyakrupa Sahoo | Probing sterile neutrino in $B$ ($D$) meson decays at Belle II (BESIII) | 9 pages, 6 figures. This is a pre-print of an article published in
European Physical Journal C. The final authenticated version is available
online at https://doi.org/10.1140/epjc/s10052-020-8310-2 | Eur. Phys. J. C 80, no.8, 730 (2020) | 10.1140/epjc/s10052-020-8310-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present, how a systematic study of $B \to D\ell N$ ($D \to K \ell N$)
decays with $\ell=\mu,\tau$, at Belle II (BESIII) can provide unambiguous
signature of a heavy neutrino $N$ and/or constrain its mixing with active
neutrinos $\nu_\ell$, which is parameterized by $|U_{\ell N}|^2$. Our
constraint on $|U_{\mu N}|^2$ that can be achieved from the full Belle II data
is comparable with what can be obtained from the much larger data set of the
upgraded LHCb. Additionally, our method offers better constraint on $|U_{\mu
N}|^2$ for mass of sterile neutrino $m_N < 2$ GeV. We can also probe the Dirac
and Majorana nature of $N$ by observing the sequential decay of $N$, including
suppression from observation of a displaced vertex as well as helicity flip,
for Majorana $N$.
| [
{
"created": "Thu, 1 Aug 2019 13:11:34 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Aug 2020 14:26:15 GMT",
"version": "v2"
}
] | 2020-08-19 | [
[
"Kim",
"C. S.",
""
],
[
"Kwon",
"Youngjoon",
""
],
[
"Lee",
"Donghun",
""
],
[
"Oh",
"Sechul",
""
],
[
"Sahoo",
"Dibyakrupa",
""
]
] | We present, how a systematic study of $B \to D\ell N$ ($D \to K \ell N$) decays with $\ell=\mu,\tau$, at Belle II (BESIII) can provide unambiguous signature of a heavy neutrino $N$ and/or constrain its mixing with active neutrinos $\nu_\ell$, which is parameterized by $|U_{\ell N}|^2$. Our constraint on $|U_{\mu N}|^2$ that can be achieved from the full Belle II data is comparable with what can be obtained from the much larger data set of the upgraded LHCb. Additionally, our method offers better constraint on $|U_{\mu N}|^2$ for mass of sterile neutrino $m_N < 2$ GeV. We can also probe the Dirac and Majorana nature of $N$ by observing the sequential decay of $N$, including suppression from observation of a displaced vertex as well as helicity flip, for Majorana $N$. |
1512.01766 | Ren-You Zhang | Zhang Wen-Juan, Ma Wen-Gan, Zhang Ren-You, Li Xiao-Zhou, Guo Lei, and
Chen Chong | Double Higgs boson production and decay in Randall-Sundrum model at
hadron colliders | 26 pages, 11 figures | Phys. Rev. D 92 (2015) 116005 | 10.1103/PhysRevD.92.116005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the double Higgs production and decay at the $14~ {\rm TeV}$
LHC and $33~ {\rm TeV}$ HE-LHC in both the standard model and Randall-Sundrum
(RS) model. In our calculation we consider reasonably only the contribution of
the lightest two Kaluza-Klein (KK) gravitons. We present the integrated cross
sections and some kinematic distributions in both models. Our results show that
the RS effect in the vicinities of $M_{HH} \sim M_{1}$, $M_{2}$ (the masses of
the lightest two KK gravitons) or in the central Higgs rapidity region is quite
significant, and can be extracted from the heavy SM background by imposing
proper kinematic cuts on final particles. We also study the dependence of the
cross section on the RS model parameters, the first KK graviton mass $M_1$ and
the effective coupling $c_0$, and find that the RS effect is reduced obviously
with the increment of $M_1$ or decrement of $c_0$.
| [
{
"created": "Sun, 6 Dec 2015 10:02:05 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2016 02:49:00 GMT",
"version": "v2"
}
] | 2016-03-08 | [
[
"Wen-Juan",
"Zhang",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Xiao-Zhou",
"Li",
""
],
[
"Lei",
"Guo",
""
],
[
"Chong",
"Chen",
""
]
] | We investigate the double Higgs production and decay at the $14~ {\rm TeV}$ LHC and $33~ {\rm TeV}$ HE-LHC in both the standard model and Randall-Sundrum (RS) model. In our calculation we consider reasonably only the contribution of the lightest two Kaluza-Klein (KK) gravitons. We present the integrated cross sections and some kinematic distributions in both models. Our results show that the RS effect in the vicinities of $M_{HH} \sim M_{1}$, $M_{2}$ (the masses of the lightest two KK gravitons) or in the central Higgs rapidity region is quite significant, and can be extracted from the heavy SM background by imposing proper kinematic cuts on final particles. We also study the dependence of the cross section on the RS model parameters, the first KK graviton mass $M_1$ and the effective coupling $c_0$, and find that the RS effect is reduced obviously with the increment of $M_1$ or decrement of $c_0$. |
1502.00034 | Natsumi Nagata | Jason L. Evans, Natsumi Nagata, and Keith A. Olive | SU(5) Grand Unification in Pure Gravity Mediation | 23 pages, 7 figures. Version accepted for publication in Physical
Review D | Phys. Rev. D 91, 055027 (2015) | 10.1103/PhysRevD.91.055027 | FTPI-MINN-15/02, UMN-TH-3417/15, IPMU15-0011 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the proton lifetime in pure gravity mediation models with
non-universal Higgs soft masses. Pure gravity mediation offers a simple
framework for studying SU(5) grand unified theories with a split supersymmetry
like spectra. We find that for much of the parameter space gauge coupling
unification is quite good leading to rather long lifetimes for the proton.
However, for $m_{3/2}\sim 60$ TeV and $\tan\beta\sim 4$, for which gauge
coupling unification is also good, the proton lifetime is short enough that it
could be in reach of future experiments.
| [
{
"created": "Fri, 30 Jan 2015 22:19:10 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Mar 2015 01:11:26 GMT",
"version": "v2"
}
] | 2015-04-01 | [
[
"Evans",
"Jason L.",
""
],
[
"Nagata",
"Natsumi",
""
],
[
"Olive",
"Keith A.",
""
]
] | We discuss the proton lifetime in pure gravity mediation models with non-universal Higgs soft masses. Pure gravity mediation offers a simple framework for studying SU(5) grand unified theories with a split supersymmetry like spectra. We find that for much of the parameter space gauge coupling unification is quite good leading to rather long lifetimes for the proton. However, for $m_{3/2}\sim 60$ TeV and $\tan\beta\sim 4$, for which gauge coupling unification is also good, the proton lifetime is short enough that it could be in reach of future experiments. |
1808.01841 | Raghunath Sahoo | Suman Deb, Dhananjaya Thakur, Sudipan De, and Raghunath Sahoo | Multiplicity Dependence of J/$\psi$ Production and QCD Dynamics in $p+p$
Collisions at $\sqrt{s}$ = 13 TeV | Same as published version | Eur. Phys. J. A (2020) 56:134 | 10.1140/epja/s10050-020-00138-4 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In inelastic $p+p$ collisions, the interacting objects are quarks and gluons
(partons). It is believed that there are multiple interactions between the
partons in a single $p+p$ event. Recent studies of multiplicity dependence of
particle production in $p+p$ collisions have gathered considerable interest in
the scientific community. According to several theoretical calculations,
multiple gluon participation in hadronic collisions is the cause of
high-multiplicity events. If the interaction is hard enough (large $p_{\rm T}$
transfer), the semi-hard processes of multiple interactions of partons might
also lead to production of heavy particles like J/$\psi$. At the LHC, an
approximately linear increase of the relative J/$\psi$ yield with charged
particle multiplicity is observed in $p+p$ collisions. In the present work, we
have studied the contribution of quarks and gluons to the multiplicity
dependence of J/$\psi$ production using pQCD inspired event generator, PYTHIA8
tune 4C, in $p+p$ collisions at $\sqrt{s} =$13 TeV by investigating relative
J/$\psi$ yield and relative $\langle p_{\rm T} \rangle$ of J/$\psi$ as a
function of charged particle multiplicity for different hard-QCD processes. We
have estimated a newly defined ratio, $r_{pp} = {\langle p_{\rm T}^{2}
\rangle}_{i}/{\langle p_{\rm T}^{2} \rangle}_{\rm MB}$, to understand J/$\psi$
production in high-multiplicity $p+p$ collisions. For the first time we attempt
to study the nuclear modification factor like observables ($R_{\rm pp}$ and
$R_{\rm cp}$) to understand the QCD medium formed in high-multiplicity $p+p$
collisions.
| [
{
"created": "Mon, 6 Aug 2018 12:22:51 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2020 16:20:45 GMT",
"version": "v2"
}
] | 2020-05-21 | [
[
"Deb",
"Suman",
""
],
[
"Thakur",
"Dhananjaya",
""
],
[
"De",
"Sudipan",
""
],
[
"Sahoo",
"Raghunath",
""
]
] | In inelastic $p+p$ collisions, the interacting objects are quarks and gluons (partons). It is believed that there are multiple interactions between the partons in a single $p+p$ event. Recent studies of multiplicity dependence of particle production in $p+p$ collisions have gathered considerable interest in the scientific community. According to several theoretical calculations, multiple gluon participation in hadronic collisions is the cause of high-multiplicity events. If the interaction is hard enough (large $p_{\rm T}$ transfer), the semi-hard processes of multiple interactions of partons might also lead to production of heavy particles like J/$\psi$. At the LHC, an approximately linear increase of the relative J/$\psi$ yield with charged particle multiplicity is observed in $p+p$ collisions. In the present work, we have studied the contribution of quarks and gluons to the multiplicity dependence of J/$\psi$ production using pQCD inspired event generator, PYTHIA8 tune 4C, in $p+p$ collisions at $\sqrt{s} =$13 TeV by investigating relative J/$\psi$ yield and relative $\langle p_{\rm T} \rangle$ of J/$\psi$ as a function of charged particle multiplicity for different hard-QCD processes. We have estimated a newly defined ratio, $r_{pp} = {\langle p_{\rm T}^{2} \rangle}_{i}/{\langle p_{\rm T}^{2} \rangle}_{\rm MB}$, to understand J/$\psi$ production in high-multiplicity $p+p$ collisions. For the first time we attempt to study the nuclear modification factor like observables ($R_{\rm pp}$ and $R_{\rm cp}$) to understand the QCD medium formed in high-multiplicity $p+p$ collisions. |
hep-ph/0503111 | Cristian Valenzuela | Cristian Valenzuela | Spontaneous CP Symmetry Breaking at the Electroweak Scale | 25 pages, LaTeX. References and comment added | Phys.Rev. D71 (2005) 095014 | 10.1103/PhysRevD.71.095014 | null | hep-ph | null | We present a top-condensation model in which the CP symmetry is spontaneously
broken at the electroweak scale due to the condensation of two composite Higgs
doublets. In particular the CP-violating phase of the CKM matrix is generated.
A simpler model where only one quark family is included is also discussed. In
this case, for a general four-fermion interaction ($G_{tb}\neq 0$), the
particle spectrum is the one of the one Higgs doublet model.
| [
{
"created": "Fri, 11 Mar 2005 20:51:28 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2005 23:33:47 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Jun 2005 15:28:32 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Valenzuela",
"Cristian",
""
]
] | We present a top-condensation model in which the CP symmetry is spontaneously broken at the electroweak scale due to the condensation of two composite Higgs doublets. In particular the CP-violating phase of the CKM matrix is generated. A simpler model where only one quark family is included is also discussed. In this case, for a general four-fermion interaction ($G_{tb}\neq 0$), the particle spectrum is the one of the one Higgs doublet model. |
2005.14536 | Henning Bahl | H. Bahl, P. Bechtle, S. Heinemeyer, S. Liebler, T. Stefaniak, G.
Weiglein | HL-LHC and ILC sensitivities in the hunt for heavy Higgs bosons | 42 pages, 15 figures (incl. 10 W\"ascheleinen-lots); matches version
to be published in EPJC | null | 10.1140/epjc/s10052-020-08472-z | BONN-TH 2019-04, DESY 19-093, KA-TP-09-2019, IFT-UAM/CSIC-19-075 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The prediction of additional Higgs bosons is one of the key features of
physics beyond the Standard Model (SM) that gives rise to an extended Higgs
sector. We assess the sensitivity of the Large Hadron Collider (LHC) in the
high luminosity (HL) run alone and in combination with a possible future
International Linear Collider (ILC) to probe heavy neutral Higgs bosons. We
employ the Minimal Supersymmetric Standard Model (MSSM) as a framework and
assume the light CP-even MSSM Higgs boson to be the Higgs boson observed at 125
GeV. We discuss the constraints on the MSSM parameter space arising from the
precision measurements of the rates of the detected signal at 125 GeV and from
direct searches for new heavy Higgs bosons in the $\tau^+\tau^-$, $b\bar{b}$
and di-Higgs ($hh$) final states. A new benchmark scenario for heavy Higgs
searches in the $b\bar{b}$ channel is proposed in this context. For the future
Higgs rate measurements at the HL-LHC and ILC two different scenarios are
investigated, namely the case where the future rate measurements agree with the
SM prediction and the case where the rates agree with the predictions of
possible realizations of the MSSM Higgs sector in nature.
| [
{
"created": "Fri, 29 May 2020 12:40:58 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2020 12:16:14 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"Bahl",
"H.",
""
],
[
"Bechtle",
"P.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Liebler",
"S.",
""
],
[
"Stefaniak",
"T.",
""
],
[
"Weiglein",
"G.",
""
]
] | The prediction of additional Higgs bosons is one of the key features of physics beyond the Standard Model (SM) that gives rise to an extended Higgs sector. We assess the sensitivity of the Large Hadron Collider (LHC) in the high luminosity (HL) run alone and in combination with a possible future International Linear Collider (ILC) to probe heavy neutral Higgs bosons. We employ the Minimal Supersymmetric Standard Model (MSSM) as a framework and assume the light CP-even MSSM Higgs boson to be the Higgs boson observed at 125 GeV. We discuss the constraints on the MSSM parameter space arising from the precision measurements of the rates of the detected signal at 125 GeV and from direct searches for new heavy Higgs bosons in the $\tau^+\tau^-$, $b\bar{b}$ and di-Higgs ($hh$) final states. A new benchmark scenario for heavy Higgs searches in the $b\bar{b}$ channel is proposed in this context. For the future Higgs rate measurements at the HL-LHC and ILC two different scenarios are investigated, namely the case where the future rate measurements agree with the SM prediction and the case where the rates agree with the predictions of possible realizations of the MSSM Higgs sector in nature. |
hep-ph/9403381 | null | E.Shuryak and M.Velkovsky (Physics Department, State University of New
York, Stony Brook, NY) | The Instanton Density at Finite Temperatures | null | Phys.Rev. D50 (1994) 3323-3327 | 10.1103/PhysRevD.50.3323 | null | hep-ph | null | For {\it low} T new strict results for the instanton density n(T) are
reported. Using the PCAC methods, we express n(T) in terms of {\it vacuum}
average values of certain operators, times their {\it calculated} T-dependence.
At high T, we discuss the {\it applicability} limits of the perturbative
results. We further speculate about possible behaviour of n(T) at $T\sim T_c$.
| [
{
"created": "Mon, 28 Mar 1994 23:18:47 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Shuryak",
"E.",
"",
"Physics Department, State University of New\n York, Stony Brook, NY"
],
[
"Velkovsky",
"M.",
"",
"Physics Department, State University of New\n York, Stony Brook, NY"
]
] | For {\it low} T new strict results for the instanton density n(T) are reported. Using the PCAC methods, we express n(T) in terms of {\it vacuum} average values of certain operators, times their {\it calculated} T-dependence. At high T, we discuss the {\it applicability} limits of the perturbative results. We further speculate about possible behaviour of n(T) at $T\sim T_c$. |
hep-ph/9706301 | null | She-Sheng Xue | Neutrino masses and mixings | LaTex 11 pages | Mod.Phys.Lett.A14:2701-2708,1999 | 10.1142/S0217732399002844 | null | hep-ph | null | We propose a novel theoretical understanding of neutrino masses and mixings,
which is attributed to the intrinsic vector-like feature of the regularized
Standard Model at short distances. We try to explain the smallness of Dirac
neutrino masses and the decoupling of the right-handed neutrino as a free
particle. Neutrino masses and mixing angles are completely related to each
other in the Schwinger-Dyson equations for their self-energy functions. The
solutions to these equations and a possible pattern of masses and mixings are
discussed.
| [
{
"created": "Mon, 9 Jun 1997 17:18:58 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Xue",
"She-Sheng",
""
]
] | We propose a novel theoretical understanding of neutrino masses and mixings, which is attributed to the intrinsic vector-like feature of the regularized Standard Model at short distances. We try to explain the smallness of Dirac neutrino masses and the decoupling of the right-handed neutrino as a free particle. Neutrino masses and mixing angles are completely related to each other in the Schwinger-Dyson equations for their self-energy functions. The solutions to these equations and a possible pattern of masses and mixings are discussed. |
hep-ph/9709307 | Manuel Malheiro | M. Malheiro and W. Melnitchouk | Nucleon Strange Magnetic Moment and Relativistic Covariance | 8 pages revtex, 2 postscript figures, to appear in Phys. Rev. C,
Rapid Communications | Phys.Rev.C56:2373-2377,1997 | 10.1103/PhysRevC.56.R2373 | UMD PP 97-109 | hep-ph nucl-th | null | We calculate the corrections to the strange matrix elements of the nucleon
resulting from the breaking of rotational invariance on the light-cone. In the
meson cloud model, the strange magnetic moment mu_S is seen to change sign once
the spurious form factors arising from this violation are subtracted. The
resulting mu_S is small and slightly positive, in agreement with the trend of
the recent data from the SAMPLE experiment. The value of the strange magnetic
form factor is predicted to be largely Q^2 independent over the range
accessible in upcoming experiments.
| [
{
"created": "Wed, 10 Sep 1997 21:52:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Malheiro",
"M.",
""
],
[
"Melnitchouk",
"W.",
""
]
] | We calculate the corrections to the strange matrix elements of the nucleon resulting from the breaking of rotational invariance on the light-cone. In the meson cloud model, the strange magnetic moment mu_S is seen to change sign once the spurious form factors arising from this violation are subtracted. The resulting mu_S is small and slightly positive, in agreement with the trend of the recent data from the SAMPLE experiment. The value of the strange magnetic form factor is predicted to be largely Q^2 independent over the range accessible in upcoming experiments. |
hep-ph/0412082 | Igor O. Cherednikov | A.E. Dorokhov, I.O Cherednikov | QCD instantons in high energy diffractive scattering: Instanton model of
Pomeron | Important references added, minor correction in the text | null | 10.1016/j.nuclphysbps.2005.02.080 | null | hep-ph | null | The role of the QCD vacuum effects in high energy diffractive quark-quark and
quark-antiquark scattering is studied with the Instanton Liquid Model. The
special attention is given to the problem of formation of the soft Pomeron. We
show that in the leading approximation in instanton density the $C-$odd
instanton contribution to the diffractive amplitude is suppressed as $1/s$
compared to the $C-$even one.
| [
{
"created": "Mon, 6 Dec 2004 13:59:38 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Dec 2004 20:06:00 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Dorokhov",
"A. E.",
""
],
[
"Cherednikov",
"I. O",
""
]
] | The role of the QCD vacuum effects in high energy diffractive quark-quark and quark-antiquark scattering is studied with the Instanton Liquid Model. The special attention is given to the problem of formation of the soft Pomeron. We show that in the leading approximation in instanton density the $C-$odd instanton contribution to the diffractive amplitude is suppressed as $1/s$ compared to the $C-$even one. |
hep-ph/0208193 | Kerry Whisnant | K. Whisnant, Jin Min Yang, Bing-Lin Young | Measuring CP violation and mass ordering in joint long baseline
experiments with superbeams | 25 RevTEX pages, 16 PS figures, revised figure captions and
references added | Phys.Rev. D67 (2003) 013004 | 10.1103/PhysRevD.67.013004 | AMES-HET-02-05 | hep-ph | null | We propose to measure the CP phase $\delta_{\rm CP}$, the magnitude of the
neutrino mixing matrix element $|U_{e3}|$ and the sign of the atmopheric scale
mass--squared difference $\Delta{\rm m}^2_{31}$ with a superbeam by the joint
analysis of two different long baseline neutrino oscillation experiments. One
is a long baseline experiment (LBL) at 300 km and the other is a very long
baseline (VLBL) experiment at 2100 km. We take the neutrino source to be the
approved high intensity proton synchrotron, HIPA. The neutrino beam for the LBL
is the 2-degree off-axis superbeam and for the VLBL, a narrow band superbeam.
Taking into account all possible errors, we evaluate the event rates required
and the sensitivities that can be attained for the determination of
$\delta_{\rm CP}$ and the sign of $\Delta m^2_{31}$. We arrive at a
representative scenario for a reasonably precise probe of this part of the
neutrino physics.
| [
{
"created": "Wed, 21 Aug 2002 16:24:23 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Nov 2002 21:40:33 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Whisnant",
"K.",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Young",
"Bing-Lin",
""
]
] | We propose to measure the CP phase $\delta_{\rm CP}$, the magnitude of the neutrino mixing matrix element $|U_{e3}|$ and the sign of the atmopheric scale mass--squared difference $\Delta{\rm m}^2_{31}$ with a superbeam by the joint analysis of two different long baseline neutrino oscillation experiments. One is a long baseline experiment (LBL) at 300 km and the other is a very long baseline (VLBL) experiment at 2100 km. We take the neutrino source to be the approved high intensity proton synchrotron, HIPA. The neutrino beam for the LBL is the 2-degree off-axis superbeam and for the VLBL, a narrow band superbeam. Taking into account all possible errors, we evaluate the event rates required and the sensitivities that can be attained for the determination of $\delta_{\rm CP}$ and the sign of $\Delta m^2_{31}$. We arrive at a representative scenario for a reasonably precise probe of this part of the neutrino physics. |
0907.4901 | Alexei Nefediev | Yu.S.Kalashnikova, A.V.Nefediev (ITEP, Moscow) | Nature of X(3872) from data | RevTeX4, 25 pages | Phys.Rev.D80:074004,2009 | 10.1103/PhysRevD.80.074004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Properties of the charmonium-like state X(3872) are investigated and its
nature is discussed as based on the existing experimental data. In particular,
we analyse the new data from Belle and BaBar Collaborations and argue that,
while the BaBar data prefer the dynamically generated virtual state in the
D\bar{D}* system, the new Belle data clearly indicate a sizable c\bar{c} 2^3P_1
component in the X wave function.
| [
{
"created": "Tue, 28 Jul 2009 12:37:17 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Kalashnikova",
"Yu. S.",
"",
"ITEP, Moscow"
],
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
]
] | Properties of the charmonium-like state X(3872) are investigated and its nature is discussed as based on the existing experimental data. In particular, we analyse the new data from Belle and BaBar Collaborations and argue that, while the BaBar data prefer the dynamically generated virtual state in the D\bar{D}* system, the new Belle data clearly indicate a sizable c\bar{c} 2^3P_1 component in the X wave function. |
1011.2274 | Wen-long Sang | Jungil Lee, WenLong Sang (Korea U.), Seyong Kim (Sejong U.) | Relativistic corrections to the axial vector and vector currents in the
bar{b}c meson system at order alpha_s | 34 pages, no figure | JHEP 1101:113,2011 | 10.1007/JHEP01(2011)113 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | We compute the short distance coefficients for the NRQCD factorization
formulas of the meson-to-vacuum matrix elements for the axial vector and vector
parts of the charged weak current in the $S$-wave spin-singlet and -triplet
bar{b}c mesons, respectively. The computation is carried out to order alpha_s
including relativistic corrections of all orders in vec{q}^{2n}, where vec{q}
is the relative momentum of the bar{b} and c in the meson rest frame. The
relativistic corrections at order alpha_s are new. The results reveal that the
relativistic corrections to the leptonic decay rate of the B_c meson at order
alpha_s or less converge rapidly, which shows a strong contrast to the
uncomfortably large corrections of order alpha_s^2|vec{q}|^0. The short
distance coefficients listed in this paper can be employed to compute the
resummation of relativistic corrections to the phenomenological measurables
that involve B_c and B_c^* production and decay.
| [
{
"created": "Wed, 10 Nov 2010 05:09:47 GMT",
"version": "v1"
}
] | 2011-05-13 | [
[
"Lee",
"Jungil",
"",
"Korea U."
],
[
"Sang",
"WenLong",
"",
"Korea U."
],
[
"Kim",
"Seyong",
"",
"Sejong U."
]
] | We compute the short distance coefficients for the NRQCD factorization formulas of the meson-to-vacuum matrix elements for the axial vector and vector parts of the charged weak current in the $S$-wave spin-singlet and -triplet bar{b}c mesons, respectively. The computation is carried out to order alpha_s including relativistic corrections of all orders in vec{q}^{2n}, where vec{q} is the relative momentum of the bar{b} and c in the meson rest frame. The relativistic corrections at order alpha_s are new. The results reveal that the relativistic corrections to the leptonic decay rate of the B_c meson at order alpha_s or less converge rapidly, which shows a strong contrast to the uncomfortably large corrections of order alpha_s^2|vec{q}|^0. The short distance coefficients listed in this paper can be employed to compute the resummation of relativistic corrections to the phenomenological measurables that involve B_c and B_c^* production and decay. |
1406.3684 | Hideko Nagahiro | Hideko Nagahiro and Atsushi Hosaka | Elementarity of composite systems | 13 pages, 8 figures, title changed, published | Phys. Rev. C 90, 065201 (2014) | 10.1103/PhysRevC.90.065201 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The "compositeness" or "elementarity" is investigated for s-wave composite
states dynamically generated by energy-dependent and independent interactions.
The bare mass of the corresponding fictitious elementary particle in an
equivalent Yukawa model is shown to be infinite, indicating that the wave
function renormalization constant Z is equal to zero. The idea can be equally
applied to both resonant and bound states. In a special case of zero-energy
bound states, the condition Z = 0 does not necessarily mean that the elementary
particle has the infinite bare mass. We also emphasize arbitrariness in the
"elementarity" leading to multiple interpretations of a physical state, which
can be either a pure composite state with Z = 0 or an elementary particle with
Z \ne 0. The arbitrariness is unavoidable because the renormalization constant
Z is not a physical observable.
| [
{
"created": "Sat, 14 Jun 2014 05:16:16 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Dec 2014 02:30:40 GMT",
"version": "v2"
}
] | 2014-12-10 | [
[
"Nagahiro",
"Hideko",
""
],
[
"Hosaka",
"Atsushi",
""
]
] | The "compositeness" or "elementarity" is investigated for s-wave composite states dynamically generated by energy-dependent and independent interactions. The bare mass of the corresponding fictitious elementary particle in an equivalent Yukawa model is shown to be infinite, indicating that the wave function renormalization constant Z is equal to zero. The idea can be equally applied to both resonant and bound states. In a special case of zero-energy bound states, the condition Z = 0 does not necessarily mean that the elementary particle has the infinite bare mass. We also emphasize arbitrariness in the "elementarity" leading to multiple interpretations of a physical state, which can be either a pure composite state with Z = 0 or an elementary particle with Z \ne 0. The arbitrariness is unavoidable because the renormalization constant Z is not a physical observable. |
2005.07003 | Mamiya Kawaguchi | Mamiya Kawaguchi, Shinya Matsuzaki, Akio Tomiya | Analysis on nonperturbative flavor violation at chiral crossover
criticality in QCD | 25 pages, 13 figures, minor corrections made, some revision made | Phys. Rev. D 103, 054034 (2021) | 10.1103/PhysRevD.103.054034 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the violation of quark-flavor symmetry at high temperatures,
induced from nonperturbative thermal loop corrections and axial anomaly, based
on a three-flavor linear-sigma model including an axial-anomaly induced-flavor
breaking term. We employ a nonperturbative analysis following the
Cornwall-Jackiw-Tomboulis formalism, and show that the model undergoes a chiral
crossover with a pseudo-critical temperature, consistently with lattice
observations. We find following features regarding the flavor breaking eminent
around and above the pseudo-critical temperature: i) up-and down-quark
condensates drop faster than the strange quark's toward the criticality, but
still keep nonzero value even going far above the critical temperature; ii) the
introduced anomaly-related flavor-breaking effect acts as a catalyzer toward
the chiral restoration, and reduces the amount of flavor breaking in the up,
down and strange quark condensates; iii) a dramatic deformation for the meson
flavor mixing structure is observed, in which the anomaly-induced favor
breaking is found to be almost irrelevant; iv) the meson spectroscopy gets
corrected by the net nonperturbative flavor breaking effects, where the scalar
meson mass hierarchy (inverse mass hierarchy) is significantly altered by the
presence of the anomaly-related flavor breaking; v) the topological
susceptibility significantly gets the contribution from the surviving strange
quark condensate, which cannot be dictated by the chiral perturbation theory,
and deviates from the dilute instanton gas prediction. There the
anomaly-induced flavor breaking plays a role of the destructive interference
for the net flavor violation; vi) the U(1)_A breaking is enhanced by the
strange quark condensate, which may account for the tension in the effective
U(1)_A restoration observed on lattices with two flavors and 2+1 flavors near
the chiral limit.
| [
{
"created": "Thu, 14 May 2020 14:23:42 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2021 03:32:17 GMT",
"version": "v2"
}
] | 2021-03-31 | [
[
"Kawaguchi",
"Mamiya",
""
],
[
"Matsuzaki",
"Shinya",
""
],
[
"Tomiya",
"Akio",
""
]
] | We discuss the violation of quark-flavor symmetry at high temperatures, induced from nonperturbative thermal loop corrections and axial anomaly, based on a three-flavor linear-sigma model including an axial-anomaly induced-flavor breaking term. We employ a nonperturbative analysis following the Cornwall-Jackiw-Tomboulis formalism, and show that the model undergoes a chiral crossover with a pseudo-critical temperature, consistently with lattice observations. We find following features regarding the flavor breaking eminent around and above the pseudo-critical temperature: i) up-and down-quark condensates drop faster than the strange quark's toward the criticality, but still keep nonzero value even going far above the critical temperature; ii) the introduced anomaly-related flavor-breaking effect acts as a catalyzer toward the chiral restoration, and reduces the amount of flavor breaking in the up, down and strange quark condensates; iii) a dramatic deformation for the meson flavor mixing structure is observed, in which the anomaly-induced favor breaking is found to be almost irrelevant; iv) the meson spectroscopy gets corrected by the net nonperturbative flavor breaking effects, where the scalar meson mass hierarchy (inverse mass hierarchy) is significantly altered by the presence of the anomaly-related flavor breaking; v) the topological susceptibility significantly gets the contribution from the surviving strange quark condensate, which cannot be dictated by the chiral perturbation theory, and deviates from the dilute instanton gas prediction. There the anomaly-induced flavor breaking plays a role of the destructive interference for the net flavor violation; vi) the U(1)_A breaking is enhanced by the strange quark condensate, which may account for the tension in the effective U(1)_A restoration observed on lattices with two flavors and 2+1 flavors near the chiral limit. |
1801.07726 | Hyun Min Lee | Soo-Min Choi, Hyun Min Lee, Pyungwon Ko, Alexander Natale | Resolving phenomenological problems with
strongly-interacting-massive-particle models with dark vector resonances | 9 pages, 4 figures, Title changed, Accepted to Physical Review D | Phys. Rev. D 98, 015034 (2018) | 10.1103/PhysRevD.98.015034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a light dark matter candidate which is produced by the freeze-out
mechanism with $3\rightarrow2$ annihilations, the so called Strongly
Interacting Massive Particles (SIMPs). SIMPs are identified as dark pions in
dark chiral perturbation theory (ChPT) where both light mass and strong
coupling needed for SIMPs can be realized by strong dynamics. In QCD-like
theories with $SU(3)_L \times SU(3)_R /SU(3)_V$ flavor symmetry, including dark
vector mesons in the hidden local symmetry scheme, we illustrate that dark
vector mesons unitarize the dark ChPT efficiently, thus determine the correct
relic density condition within the validity of the dark ChPT.
| [
{
"created": "Tue, 23 Jan 2018 19:00:16 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2018 14:09:47 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Choi",
"Soo-Min",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Ko",
"Pyungwon",
""
],
[
"Natale",
"Alexander",
""
]
] | We consider a light dark matter candidate which is produced by the freeze-out mechanism with $3\rightarrow2$ annihilations, the so called Strongly Interacting Massive Particles (SIMPs). SIMPs are identified as dark pions in dark chiral perturbation theory (ChPT) where both light mass and strong coupling needed for SIMPs can be realized by strong dynamics. In QCD-like theories with $SU(3)_L \times SU(3)_R /SU(3)_V$ flavor symmetry, including dark vector mesons in the hidden local symmetry scheme, we illustrate that dark vector mesons unitarize the dark ChPT efficiently, thus determine the correct relic density condition within the validity of the dark ChPT. |
1707.00657 | C.-P. Yuan | Tie-Jiun Hou, Sayipjamal Dulat, Jun Gao, Marco Guzzi, Joey Huston,
Pavel Nadolsky, Carl Schmidt, Jan Winter, Keping Xie, and C.-P. Yuan | CT14 Intrinsic Charm Parton Distribution Functions from CTEQ-TEA Global
Analysis | 57 pages, 19 figures, and 3 tables | null | 10.1007/JHEP02(2018)059 | MSUHEP-17-012 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility of a (sizable) nonperturbative contribution to
the charm parton distribution function (PDF) in a nucleon, theoretical issues
arising in its interpretation, and its potential impact on LHC scattering
processes. The "fitted charm" PDF obtained in various QCD analyses contains a
process-dependent component that is partly traced to power-suppressed radiative
contributions in DIS and is generally different at the LHC. We discuss
separation of the universal component of the nonperturbative charm from the
rest of the radiative contributions and estimate its magnitude in the CT14
global QCD analysis at the next-to-next-to leading order in the QCD coupling
strength, including the latest experimental data from HERA and the Large Hadron
Collider. Models for the nonperturbative charm PDF are examined as a function
of the charm quark mass and other parameters. The prospects for testing these
models in the associated production of a Z boson and a charm jet at the LHC are
studied under realistic assumptions, including effects of the final-state
parton showering.
| [
{
"created": "Mon, 3 Jul 2017 17:14:51 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jul 2017 06:30:16 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Jan 2018 17:32:17 GMT",
"version": "v3"
}
] | 2018-04-04 | [
[
"Hou",
"Tie-Jiun",
""
],
[
"Dulat",
"Sayipjamal",
""
],
[
"Gao",
"Jun",
""
],
[
"Guzzi",
"Marco",
""
],
[
"Huston",
"Joey",
""
],
[
"Nadolsky",
"Pavel",
""
],
[
"Schmidt",
"Carl",
""
],
[
"Winter",
... | We investigate the possibility of a (sizable) nonperturbative contribution to the charm parton distribution function (PDF) in a nucleon, theoretical issues arising in its interpretation, and its potential impact on LHC scattering processes. The "fitted charm" PDF obtained in various QCD analyses contains a process-dependent component that is partly traced to power-suppressed radiative contributions in DIS and is generally different at the LHC. We discuss separation of the universal component of the nonperturbative charm from the rest of the radiative contributions and estimate its magnitude in the CT14 global QCD analysis at the next-to-next-to leading order in the QCD coupling strength, including the latest experimental data from HERA and the Large Hadron Collider. Models for the nonperturbative charm PDF are examined as a function of the charm quark mass and other parameters. The prospects for testing these models in the associated production of a Z boson and a charm jet at the LHC are studied under realistic assumptions, including effects of the final-state parton showering. |
1207.6542 | P. S. Bhupal Dev | P. S. Bhupal Dev, Subhadeep Mondal, Biswarup Mukhopadhyaya, Sourov Roy | Phenomenology of Light Sneutrino Dark Matter in cMSSM/mSUGRA with
Inverse Seesaw | 24 pages, 4 figures, 7 tables; matches published version | JHEP 09, 110 (2012) | 10.1007/JHEP09(2012)110 | RECAPP-HRI-2012-009 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of a light Dark Matter (DM) within a constrained
Minimal Supersymmetric Standard Model (cMSSM) framework augmented by a SM
singlet-pair sector to account for the non-zero neutrino masses by inverse
seesaw mechanism. Working within a 'hybrid' scenario with the MSSM sector fixed
at high scale and the singlet neutrino sector at low scale, we find that,
contrary to the case of the usual cMSSM where the neutralino DM cannot be very
light, we can have a light sneutrino DM with mass below 100 GeV satisfying all
the current experimental constraints from cosmology, collider as well as
low-energy experiments. We also note that the supersymmetric inverse seesaw
mechanism with sneutrino as the lightest supersymmetric partner can have
enhanced same-sign dilepton final states with large missing transverse energy
(mET) coming from the gluino- and squark-pair as well as the squark-gluino
associated productions and their cascade decay through charginos. We present a
collider study for the same-sign dilepton+jets+mET signal in this scenario and
propose some distinctions with the usual cMSSM. We also comment on the
implications of such a light DM scenario on the invisible decay width of an 125
GeV Higgs boson.
| [
{
"created": "Fri, 27 Jul 2012 13:43:40 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2012 08:56:33 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Nov 2012 12:20:14 GMT",
"version": "v3"
}
] | 2014-10-13 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Mondal",
"Subhadeep",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"Roy",
"Sourov",
""
]
] | We study the possibility of a light Dark Matter (DM) within a constrained Minimal Supersymmetric Standard Model (cMSSM) framework augmented by a SM singlet-pair sector to account for the non-zero neutrino masses by inverse seesaw mechanism. Working within a 'hybrid' scenario with the MSSM sector fixed at high scale and the singlet neutrino sector at low scale, we find that, contrary to the case of the usual cMSSM where the neutralino DM cannot be very light, we can have a light sneutrino DM with mass below 100 GeV satisfying all the current experimental constraints from cosmology, collider as well as low-energy experiments. We also note that the supersymmetric inverse seesaw mechanism with sneutrino as the lightest supersymmetric partner can have enhanced same-sign dilepton final states with large missing transverse energy (mET) coming from the gluino- and squark-pair as well as the squark-gluino associated productions and their cascade decay through charginos. We present a collider study for the same-sign dilepton+jets+mET signal in this scenario and propose some distinctions with the usual cMSSM. We also comment on the implications of such a light DM scenario on the invisible decay width of an 125 GeV Higgs boson. |
hep-ph/0002028 | Lars Brucher | Lars Brucher | Automatic Feynman diagram calculation with xloops--a short overview | Contribution to Proceedings of 6th Rhine Workshop on Computer Algebra
(Sankt Augustin, Germany, March-April 1998), ed. J. Calmet | null | null | null | hep-ph | null | xloops is a program package that calculates Feynman diagrams by using
computer algebra systems. In this paper it is shown which problems to be solved
by computer algebra arise during such calculations, and how this problems are
handled in the framework of xloops.
| [
{
"created": "Wed, 2 Feb 2000 17:19:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brucher",
"Lars",
""
]
] | xloops is a program package that calculates Feynman diagrams by using computer algebra systems. In this paper it is shown which problems to be solved by computer algebra arise during such calculations, and how this problems are handled in the framework of xloops. |
0903.2631 | Melahat Bayar | V. Bashiry, M. Bayar | Analysis of Various Polarization Asymmetries In The Inclusive $b\to s
\ell^+ \ell^-$ Decay In The Fourth-Generation Standard Model | 19 Pages, 10 Figures, 3 Tables | Eur.Phys.J.C61:451-459,2009 | 10.1140/epjc/s10052-009-1004-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study a systematical analysis of various polarization asymmetries in
inclusive $b \rar s \ell^+ \ell^-$ decay in the standard model (SM) with four
generation of quarks is carried out. We found that the various asymmetries are
sensitive to the new mixing and quark masses for both of the $\mu$ and $\tau$
channels. Sizeable deviations from the SM values are obtained. Hence, $b \rar s
\ell^+ \ell^-$ decay is a valuable tool for searching physics beyond the SM,
especially in the indirect searches for the fourth-generation of quarks ($t',
b')$.
| [
{
"created": "Sun, 15 Mar 2009 13:23:52 GMT",
"version": "v1"
}
] | 2009-07-22 | [
[
"Bashiry",
"V.",
""
],
[
"Bayar",
"M.",
""
]
] | In this study a systematical analysis of various polarization asymmetries in inclusive $b \rar s \ell^+ \ell^-$ decay in the standard model (SM) with four generation of quarks is carried out. We found that the various asymmetries are sensitive to the new mixing and quark masses for both of the $\mu$ and $\tau$ channels. Sizeable deviations from the SM values are obtained. Hence, $b \rar s \ell^+ \ell^-$ decay is a valuable tool for searching physics beyond the SM, especially in the indirect searches for the fourth-generation of quarks ($t', b')$. |
hep-ph/9806267 | Vadim Guzey | Andreas Freund, Vadim Guzey (The Pennsylvania State University) | Study of Nondiagonal Parton Distribution Models | 17 pages, 6 figures, RevTex. Some figures have been corrected due to
a recently discovered small error in the evolution code | Phys.Lett.B462:178-188,1999 | 10.1016/S0370-2693(99)00881-3 | null | hep-ph | null | In this paper we examine predictions from different models of nondiagonal
parton distributions. This will be achieved by examining whether certain
predictions of relationships between diagonal and nondiagonal parton
distributions also hold after having evolved the different distributions.
| [
{
"created": "Fri, 5 Jun 1998 15:39:25 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Sep 1998 15:56:52 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Dec 1998 02:08:23 GMT",
"version": "v3"
},
{
"created": "Thu, 11 Feb 1999 18:59:43 GMT",
"version": "v4"
}
] | 2014-11-17 | [
[
"Freund",
"Andreas",
"",
"The Pennsylvania State University"
],
[
"Guzey",
"Vadim",
"",
"The Pennsylvania State University"
]
] | In this paper we examine predictions from different models of nondiagonal parton distributions. This will be achieved by examining whether certain predictions of relationships between diagonal and nondiagonal parton distributions also hold after having evolved the different distributions. |
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