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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1011.2692 | Francesco Murgia | Umberto D'Alesio, Cristian Pisano, and Francesco Murgia (University
and INFN, Cagliari, Italy) | Azimuthal asymmetries for hadron distributions inside a jet in hadronic
collisions | RevTeX4, 20 pages, 14 eps figures | Phys.Rev.D83:034021,2011 | 10.1103/PhysRevD.83.034021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a generalized parton model approach including spin and intrinsic parton
motion effects, and assuming the validity of factorization for large-pT jet
production in hadronic collisions, we study the azimuthal distribution around
the jet axis of leading unpolarized or (pseudo)scalar hadrons, namely pions,
produced in the jet fragmentation process. We identify the observable
leading-twist azimuthal asymmetries for the unpolarized and single-polarized
case related to quark and gluon-originated jets. We account for all physically
allowed combinations of the transverse momentum dependent (TMD) parton
distribution and fragmentation functions, with special attention to the Sivers,
Boer-Mulders, and transversity quark distributions, and to the Collins
fragmentation function for quarks (and to the analogous functions for gluons).
For each of these effects we evaluate, at central and forward rapidities and
for kinematical configurations accessible at BNL-RHIC, the corresponding
potentially maximized asymmetry (for pi+ production), obtained by saturating
natural positivity bounds (and the Soffer bound for transversity) for the
distribution and fragmentation functions involved and summing additively all
partonic contributions. We then estimate, for both neutral and charged pions,
the asymmetries involving TMD functions for which parameterizations are
available. We also study the role of the different mechanisms, and the
corresponding transverse single spin asymmetries, for large-pT inclusive jet
production.
| [
{
"created": "Thu, 11 Nov 2010 15:53:07 GMT",
"version": "v1"
}
] | 2011-02-23 | [
[
"D'Alesio",
"Umberto",
"",
"University\n and INFN, Cagliari, Italy"
],
[
"Pisano",
"Cristian",
"",
"University\n and INFN, Cagliari, Italy"
],
[
"Murgia",
"Francesco",
"",
"University\n and INFN, Cagliari, Italy"
]
] | Using a generalized parton model approach including spin and intrinsic parton motion effects, and assuming the validity of factorization for large-pT jet production in hadronic collisions, we study the azimuthal distribution around the jet axis of leading unpolarized or (pseudo)scalar hadrons, namely pions, produced in the jet fragmentation process. We identify the observable leading-twist azimuthal asymmetries for the unpolarized and single-polarized case related to quark and gluon-originated jets. We account for all physically allowed combinations of the transverse momentum dependent (TMD) parton distribution and fragmentation functions, with special attention to the Sivers, Boer-Mulders, and transversity quark distributions, and to the Collins fragmentation function for quarks (and to the analogous functions for gluons). For each of these effects we evaluate, at central and forward rapidities and for kinematical configurations accessible at BNL-RHIC, the corresponding potentially maximized asymmetry (for pi+ production), obtained by saturating natural positivity bounds (and the Soffer bound for transversity) for the distribution and fragmentation functions involved and summing additively all partonic contributions. We then estimate, for both neutral and charged pions, the asymmetries involving TMD functions for which parameterizations are available. We also study the role of the different mechanisms, and the corresponding transverse single spin asymmetries, for large-pT inclusive jet production. |
hep-ph/9612310 | null | S. Moretti (Cavendish Laboratory, Cambridge, UK) | Higgs Production at the LHC: an Updated Signal-to-Background Analysis | 52 pages, latex, epsfig, 20 postscript figures bitmapped at 90dpi,
complete paper including high resolution plots available at
ftp://axpa.hep.phy.cam.ac.uk/stefano/cavendish_9518 and at
http://www.hep.phy.cam.ac.uk/theory/papers/ | null | null | DFTT 79/95, DTP/95/104, Cavendish-HEP-95/18 | hep-ph | null | This paper follows hep-ph/9611397, where updated calculations of cross
sections and branching ratios relevant for Standard Model Higgs phenomenology
at the LHC were presented. Here, we complete that study by carrying out an
updated signal-to-background analysis. We present results obtained by using
exact matrix element computations at parton level for all processes, by
exploiting the most recent parton distributions fitted to HERA structure
function data and the most recent values of the electroweak input parameters.
Cross sections and distributions are given for two collider energies, $\sqrt
s_{pp}=10$ TeV and 14 TeV. Event rates and significances are discussed for two
possible values of integrated luminosity, 10 fb$^{-1}$ and 100 fb$^{-1}$.
| [
{
"created": "Tue, 10 Dec 1996 11:15:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moretti",
"S.",
"",
"Cavendish Laboratory, Cambridge, UK"
]
] | This paper follows hep-ph/9611397, where updated calculations of cross sections and branching ratios relevant for Standard Model Higgs phenomenology at the LHC were presented. Here, we complete that study by carrying out an updated signal-to-background analysis. We present results obtained by using exact matrix element computations at parton level for all processes, by exploiting the most recent parton distributions fitted to HERA structure function data and the most recent values of the electroweak input parameters. Cross sections and distributions are given for two collider energies, $\sqrt s_{pp}=10$ TeV and 14 TeV. Event rates and significances are discussed for two possible values of integrated luminosity, 10 fb$^{-1}$ and 100 fb$^{-1}$. |
hep-ph/9506470 | Scott Chapman | Scott Chapman, Pierre Scotto and Ulrich Heinz | The ``Out-Longitudinal'' Cross Term and Other Model Independent Features
of the Two-Particle HBT Correlation Function | 4 pages, uuencoded compressed postscript | Nucl.Phys.A590:449c-452c,1995 | 10.1016/0375-9474(95)00252-V | LA-UR-95-2150 | hep-ph | null | Using two specific models and a model independent formalism, we show that an
``out-longitudinal'' cross term should be included in any gaussian fits to
correlation data. In addition, we show that correlation radii (including the
cross term) measure lengths of homogeneity within the source, not necessarily
geometric sizes.
| [
{
"created": "Fri, 30 Jun 1995 15:38:15 GMT",
"version": "v1"
}
] | 2010-05-27 | [
[
"Chapman",
"Scott",
""
],
[
"Scotto",
"Pierre",
""
],
[
"Heinz",
"Ulrich",
""
]
] | Using two specific models and a model independent formalism, we show that an ``out-longitudinal'' cross term should be included in any gaussian fits to correlation data. In addition, we show that correlation radii (including the cross term) measure lengths of homogeneity within the source, not necessarily geometric sizes. |
hep-ph/0511280 | Tobias Hurth | Tobias Hurth (CERN, SLAC) | New Physics Search in Flavour Physics | 13 pages, 9 figures | Nucl.Phys.Proc.Suppl.156:195-202,2006 | 10.1016/j.nuclphysbps.2006.02.130 | CERN-PH-TH/2005-168, SLAC-PUB-11530 | hep-ph hep-ex | null | With the running B, kaon and neutrino physics experiments, flavour physics
takes centre stage within today's particle physics. We discuss the
opportunities offered by these experiments in our search for new physics beyond
the SM and discuss their complementarity to collider physics.
We focus on rare B and kaon decays, highlighting specific observables in an
exemplary mode. We also comment on the so-called B --> pi pi and B --> K pi
puzzles. Moreover, we briefly discuss the restrictive role of long-distance
strong interactions and some new tools such as QCD factorization and SCET to
handle them.
| [
{
"created": "Thu, 24 Nov 2005 17:24:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hurth",
"Tobias",
"",
"CERN, SLAC"
]
] | With the running B, kaon and neutrino physics experiments, flavour physics takes centre stage within today's particle physics. We discuss the opportunities offered by these experiments in our search for new physics beyond the SM and discuss their complementarity to collider physics. We focus on rare B and kaon decays, highlighting specific observables in an exemplary mode. We also comment on the so-called B --> pi pi and B --> K pi puzzles. Moreover, we briefly discuss the restrictive role of long-distance strong interactions and some new tools such as QCD factorization and SCET to handle them. |
0803.3633 | Manuel B\"ahr | Manuel B\"ahr, Stefan Gieseke and Michael H. Seymour | Simulation of multiple partonic interactions in Herwig++ | 25 pages, 16 figures, plots and tune updated for Herwig++ 2.2.1,
additional paragraph on the LHC extrapolation | JHEP0807:076,2008 | 10.1088/1126-6708/2008/07/076 | CERN-PH-TH/2008-055, KA-TP-08-2008 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we describe a new model of multiple partonic interactions that
has been implemented in Herwig++. Tuning its two free parameters we find a good
description of CDF underlying event data. We show extrapolations to the LHC.
| [
{
"created": "Wed, 26 Mar 2008 13:55:31 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 2008 17:37:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bähr",
"Manuel",
""
],
[
"Gieseke",
"Stefan",
""
],
[
"Seymour",
"Michael H.",
""
]
] | In this paper we describe a new model of multiple partonic interactions that has been implemented in Herwig++. Tuning its two free parameters we find a good description of CDF underlying event data. We show extrapolations to the LHC. |
hep-ph/9610364 | Michelangelo Mangano | M.L. Mangano and A. Petrelli | NLO Quarkonium Production in Hadronic Collisions | 11 pages, Latex, epsfig, 4 figures. To appear in the proceedings of
the Quarkonium Physics Workshop, University of Illinois, Chicago, June1996 | Int.J.Mod.Phys.A12:3887-3897,1997 | 10.1142/S0217751X97002048 | CERN-TH/96-293 | hep-ph | null | We present some preliminary results on the next-to-leading order calculation
in QCD of quarkonium production cross sections in hadronic collisions. We will
show that the NLO total cross sections for $P$-wave states produced at high
energy are not reliable, due to the appearance of very large and negative
contributions. We also discuss some issues related to the structure of final
states in colour-octet production and to high-p_T fragmentation.
| [
{
"created": "Tue, 15 Oct 1996 15:50:07 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Mangano",
"M. L.",
""
],
[
"Petrelli",
"A.",
""
]
] | We present some preliminary results on the next-to-leading order calculation in QCD of quarkonium production cross sections in hadronic collisions. We will show that the NLO total cross sections for $P$-wave states produced at high energy are not reliable, due to the appearance of very large and negative contributions. We also discuss some issues related to the structure of final states in colour-octet production and to high-p_T fragmentation. |
1910.04707 | Kiminad Mamo | Kiminad A. Mamo and Ismail Zahed | Diffractive photoproduction of $J/\psi$ and $\Upsilon$ using holographic
QCD: gravitational form factors and GPD of gluons in the proton | 40 pages, two columns, 23 figures | Phys. Rev. D 101, 086003 (2020) | 10.1103/PhysRevD.101.086003 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a holographic analysis of diffractive photoproducton of charmonium
$J/\psi$ and upsilonium $\Upsilon$ on a proton, considered as a bulk Dirac
fermion, for all ranges of $\sqrt{s}$, i.e., from near threshold to very high
energy. Using the bulk wave functions of the proton and vector mesons, within
holographic QCD, and employing Witten diagrams in the bulk, we compute the
diffractive photoproduction amplitude of $J/\psi$ and $\Upsilon$. The
holographic amplitude shows elements of the strictures of vector meson
dominance (VMD). It is dominated by the exchange of a massive graviton or
$2^{++}$ glueball resonances near threshold, and its higher spin-j counterparts
that reggeize at higher energies. Both the differential and total cross
sections are controlled by the gravitational form factor $A(t)$, and compare
well to the recent results reported by the GlueX collaboration near threshold
and the world data at large $\sqrt{s}$. The holographic gravitational form
factors, including the D-term, which is due to the exchange of massive spin-0
glueballs, are in good agreement with lattice simulations. We use it to extract
the holographic pressure and shear forces inside the proton. Finally, using a
pertinent integral representation of the holographic gravitational form factor
$A(t)$ near threshold, and its Pomeron counterpart way above threshold, we
extract the generalized parton distribution (GPD) of gluons inside the proton
at different resolutions.
| [
{
"created": "Thu, 10 Oct 2019 17:04:16 GMT",
"version": "v1"
}
] | 2020-04-08 | [
[
"Mamo",
"Kiminad A.",
""
],
[
"Zahed",
"Ismail",
""
]
] | We present a holographic analysis of diffractive photoproducton of charmonium $J/\psi$ and upsilonium $\Upsilon$ on a proton, considered as a bulk Dirac fermion, for all ranges of $\sqrt{s}$, i.e., from near threshold to very high energy. Using the bulk wave functions of the proton and vector mesons, within holographic QCD, and employing Witten diagrams in the bulk, we compute the diffractive photoproduction amplitude of $J/\psi$ and $\Upsilon$. The holographic amplitude shows elements of the strictures of vector meson dominance (VMD). It is dominated by the exchange of a massive graviton or $2^{++}$ glueball resonances near threshold, and its higher spin-j counterparts that reggeize at higher energies. Both the differential and total cross sections are controlled by the gravitational form factor $A(t)$, and compare well to the recent results reported by the GlueX collaboration near threshold and the world data at large $\sqrt{s}$. The holographic gravitational form factors, including the D-term, which is due to the exchange of massive spin-0 glueballs, are in good agreement with lattice simulations. We use it to extract the holographic pressure and shear forces inside the proton. Finally, using a pertinent integral representation of the holographic gravitational form factor $A(t)$ near threshold, and its Pomeron counterpart way above threshold, we extract the generalized parton distribution (GPD) of gluons inside the proton at different resolutions. |
2202.09217 | Saneli Alcides Carbajal Vigo | S. Carbajal, A. M. Gago | Indirect search of Heavy Neutral Leptons using the DUNE Near Detector | 11 pages, 13 figures; the chi2 is now calculated by comparing the
neutrino CC spectra instead of the total CC events | Frontiers in Physics 12 (2024) | 10.3389/fphy.2024.1398070 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We evaluate the potential of the DUNE Near Detector (DUNEND) for establishing
bounds for heavy neutral leptons (HNL). This is achieved by studying how the
presence of HNLs affects the production rates of active neutrinos, therefore,
creating a deficit in the neutrino charged current (CC) events at the LArTPC of
the DUNEND. The estimated bounds on HNLs are calculated for masses between 1 eV
and 500 MeV. We consider 10 years of operation (5 in neutrino and antineutrino
mode) and obtain limits of $|U_{\mu4}|^2 < 9 \times 10^{-3} (4 \times10^{-2})$
and $|U_{e4}|^2 < 7\times10^{-3} (3 \times10^{-2})$ for masses below 10 MeV and
a 5\%(20\%) overall normalization uncertainty in the neutrino charged current
event rates prediction. These limits, within the region of masses below 2(10)
MeV, are better than those that can be achieved by DUNE direct searches for the
case of a 5\%(20\%) uncertainty. When a conservative 20\% uncertainty is
present, our limits can only improve current constraints on $|U_{e4}|^2$ by up
to a factor of 3 in a small region around 5 eV and set limits on $|U_{\mu4}|^2$
in a mass region free of constraints (40 eV - 1 MeV).
| [
{
"created": "Fri, 18 Feb 2022 14:32:04 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Aug 2022 14:51:07 GMT",
"version": "v2"
},
{
"created": "Sun, 23 Apr 2023 14:35:02 GMT",
"version": "v3"
},
{
"created": "Mon, 2 Oct 2023 15:11:56 GMT",
"version": "v4"
},
{
"created": "Tue, 18 Jun 2024 19:17:02 GMT",
"version": "v5"
}
] | 2024-06-21 | [
[
"Carbajal",
"S.",
""
],
[
"Gago",
"A. M.",
""
]
] | We evaluate the potential of the DUNE Near Detector (DUNEND) for establishing bounds for heavy neutral leptons (HNL). This is achieved by studying how the presence of HNLs affects the production rates of active neutrinos, therefore, creating a deficit in the neutrino charged current (CC) events at the LArTPC of the DUNEND. The estimated bounds on HNLs are calculated for masses between 1 eV and 500 MeV. We consider 10 years of operation (5 in neutrino and antineutrino mode) and obtain limits of $|U_{\mu4}|^2 < 9 \times 10^{-3} (4 \times10^{-2})$ and $|U_{e4}|^2 < 7\times10^{-3} (3 \times10^{-2})$ for masses below 10 MeV and a 5\%(20\%) overall normalization uncertainty in the neutrino charged current event rates prediction. These limits, within the region of masses below 2(10) MeV, are better than those that can be achieved by DUNE direct searches for the case of a 5\%(20\%) uncertainty. When a conservative 20\% uncertainty is present, our limits can only improve current constraints on $|U_{e4}|^2$ by up to a factor of 3 in a small region around 5 eV and set limits on $|U_{\mu4}|^2$ in a mass region free of constraints (40 eV - 1 MeV). |
hep-ph/0008233 | S. Rebeca Juarez Wysozka | S.R. Juarez W. and F. Guzman A. | Precise nondivergent analytic formulas for the radiative corrections to
the beta energy spectrum in hyperon semileptonic decays over the entire
Dalitz plot | 22 pages, 4 figures | Phys.Rev.D62:033001,2000 | 10.1103/PhysRevD.62.033001 | null | hep-ph | null | Very accurate analytical expressions for the radiative corrections of
unpolarized hyperons semileptonic decays of charged and neutral baryons have
been obtained in the recent past. Some of these formulas contain logarithmic
singularities at the edges of the Dalitz plot for the three- and four-body
decays. These singularities are analyzed and integrated analytically to obtain
new divergentless formulas for the energy spectrum of the produced beta
particle. The new equations contain terms of the order alpha times the momentum
transfer, are applicable to any beta decay process and are suitable for a
model-independent experimental analysis.
| [
{
"created": "Tue, 22 Aug 2000 17:17:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"W.",
"S. R. Juarez",
""
],
[
"A.",
"F. Guzman",
""
]
] | Very accurate analytical expressions for the radiative corrections of unpolarized hyperons semileptonic decays of charged and neutral baryons have been obtained in the recent past. Some of these formulas contain logarithmic singularities at the edges of the Dalitz plot for the three- and four-body decays. These singularities are analyzed and integrated analytically to obtain new divergentless formulas for the energy spectrum of the produced beta particle. The new equations contain terms of the order alpha times the momentum transfer, are applicable to any beta decay process and are suitable for a model-independent experimental analysis. |
2405.13883 | Davide Racco | Davide Racco, Sarunas Verner, Wei Xue | Gravitational Production of Heavy Particles during and after Inflation | 28 pages + appendices, 13 figures | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We investigate the gravitational production of a scalar field $\chi$ with a
mass exceeding the Hubble scale during inflation $m_\chi \gtrsim H_I$,
employing both analytical and numerical approaches. We demonstrate that the
steepest descent method effectively captures the epochs and yields of
gravitational production in a compact and simple analytical framework. These
analytical results align with the numerical solutions of the field equation.
Our study covers three spacetime backgrounds: de Sitter, power-law inflation,
and the Starobinsky inflation model. Within these models, we identify two
distinct phases of particle production: during and after inflation. During
inflation, we derive an accurate analytic expression for the particle
production rate, accounting for a varying Hubble rate. After inflation, the
additional burst of particle production depends on the inflaton mass around its
minimum. When this mass is smaller than the Hubble scale during inflation,
$H_I$, there is no significant extra production. However, if the inflaton mass
is larger, post-inflation production becomes the dominant contribution.
Furthermore, we explore the implications of gravitationally produced heavy
fields for dark matter abundance, assuming their cosmological stability.
| [
{
"created": "Wed, 22 May 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Racco",
"Davide",
""
],
[
"Verner",
"Sarunas",
""
],
[
"Xue",
"Wei",
""
]
] | We investigate the gravitational production of a scalar field $\chi$ with a mass exceeding the Hubble scale during inflation $m_\chi \gtrsim H_I$, employing both analytical and numerical approaches. We demonstrate that the steepest descent method effectively captures the epochs and yields of gravitational production in a compact and simple analytical framework. These analytical results align with the numerical solutions of the field equation. Our study covers three spacetime backgrounds: de Sitter, power-law inflation, and the Starobinsky inflation model. Within these models, we identify two distinct phases of particle production: during and after inflation. During inflation, we derive an accurate analytic expression for the particle production rate, accounting for a varying Hubble rate. After inflation, the additional burst of particle production depends on the inflaton mass around its minimum. When this mass is smaller than the Hubble scale during inflation, $H_I$, there is no significant extra production. However, if the inflaton mass is larger, post-inflation production becomes the dominant contribution. Furthermore, we explore the implications of gravitationally produced heavy fields for dark matter abundance, assuming their cosmological stability. |
2403.19541 | George Rupp | George Rupp | Comment on "Do near-threshold molecular states mix with neighboring
$\bar QQ$ states?" | 3 pages, 1 figure; comment on arXiv:2209.10165 | null | null | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I comment on a paper by Christoph Hanhart and Alexey Nefediev, published in
Phys. Rev. D 106, 114003 (2022). The authors discuss the interpretation of
mesons close to their lowest decay threshold and present a mechanism for the
formation of molecular states. The proposed formalism is then applied to the
axial-vector mesons $D_{s1}(2536)$ and $D_{s1}(2460)$, presenting two scenarios
for the lighter meson, namely a $D^\star K$ molecule or a compact $c\bar{s}$
state. The authors argue that the latter hypothesis requires a fine-tuning of
the mixing angle between the $J^{PC}=1^{++}$ and $J^{PC}=1^{+-}$ $C$-parity
eigenstates.
In this Comment I show that no such fine-tuning is needed, as demonstrated in
an article published in Phys. Rev. D 84, 094020 (2011), where a unitarized
quark model was applied to the two $C$-parity eigenstates, coupled to several
two-meson channels including $D^\star K$. The coupled-channel dynamics
naturally leads to a mixing angle very close to the required one. Moreover, I
argue that the $D_1(2420)$ and $D_1(2430)$ axial-vectors, not considered by the
authors, as well as a lattice simulation in Phys. Rev. D 90, 034510 (2014),
also not mentioned by the authors, do not lend support to a molecular
interpretation of the $D_{s1}(2460)$. I conclude with some more general remarks
about mesons coupling to $S$-wave thresholds.
| [
{
"created": "Thu, 28 Mar 2024 16:21:36 GMT",
"version": "v1"
}
] | 2024-03-29 | [
[
"Rupp",
"George",
""
]
] | I comment on a paper by Christoph Hanhart and Alexey Nefediev, published in Phys. Rev. D 106, 114003 (2022). The authors discuss the interpretation of mesons close to their lowest decay threshold and present a mechanism for the formation of molecular states. The proposed formalism is then applied to the axial-vector mesons $D_{s1}(2536)$ and $D_{s1}(2460)$, presenting two scenarios for the lighter meson, namely a $D^\star K$ molecule or a compact $c\bar{s}$ state. The authors argue that the latter hypothesis requires a fine-tuning of the mixing angle between the $J^{PC}=1^{++}$ and $J^{PC}=1^{+-}$ $C$-parity eigenstates. In this Comment I show that no such fine-tuning is needed, as demonstrated in an article published in Phys. Rev. D 84, 094020 (2011), where a unitarized quark model was applied to the two $C$-parity eigenstates, coupled to several two-meson channels including $D^\star K$. The coupled-channel dynamics naturally leads to a mixing angle very close to the required one. Moreover, I argue that the $D_1(2420)$ and $D_1(2430)$ axial-vectors, not considered by the authors, as well as a lattice simulation in Phys. Rev. D 90, 034510 (2014), also not mentioned by the authors, do not lend support to a molecular interpretation of the $D_{s1}(2460)$. I conclude with some more general remarks about mesons coupling to $S$-wave thresholds. |
1304.5347 | John Gracey | J.A. Gracey | Renormalization group functions of QCD in the minimal MOM scheme | 22 latex pages, error in the derivation of the four loop minimal MOM
quark mass anomalous dimension corrected and erratum attached to original
article; anc directory contains the updated txt file with corrected quark
mass anomalous dimension as well as other anomalous dimensions,
beta-functions and conversion functions | null | 10.1088/1751-8113/46/22/225403 | LTH 976 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide the full set of renormalization group functions for the
renormalization of QCD in the minimal MOM scheme to four loops for the colour
group SU(N_c).
| [
{
"created": "Fri, 19 Apr 2013 09:07:52 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jan 2015 10:41:56 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Gracey",
"J. A.",
""
]
] | We provide the full set of renormalization group functions for the renormalization of QCD in the minimal MOM scheme to four loops for the colour group SU(N_c). |
hep-ph/0111087 | Hungchong Kim | Hungchong Kim, Su Houng Lee (Yonsei University) | Couplings between pion and charmed mesons | 16 pages including 4 postscript figures. To be published in European
Physical Journal C | Eur.Phys.J.C22:707-713,2002 | 10.1007/s100520100847 | null | hep-ph nucl-th | null | We compute the couplings $DD^*\pi$,$D_1D^*\pi$,$D^*D^*\pi$, $D_1 D_1\pi$
using QCD sum rules. These couplings are important inputs in the meson exchange
model calculations used to estimate the amount of $J/\psi$ absorption due to
pions and rho mesons in heavy ion collisions. Our sum rules are constructed at
the first order in the pion momentum $p_\mu$, which give the couplings that are
not trivially related to the soft-pion theorem. Our calculated couplings, which
somewhat depend upon the values of the heavy meson decay constants, are
$g_{DD^*\pi}=8.2 \pm 0.1$, $g_{D_1 D^* \pi} = 15.8 \pm 2 {\rm GeV}$, $g_{D^*
D^* \pi}= 0.3 \pm 0.03$ and $g_{D_1 D_1 \pi}= 0.17 \pm 0.04$.
| [
{
"created": "Thu, 8 Nov 2001 07:23:34 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Kim",
"Hungchong",
"",
"Yonsei University"
],
[
"Lee",
"Su Houng",
"",
"Yonsei University"
]
] | We compute the couplings $DD^*\pi$,$D_1D^*\pi$,$D^*D^*\pi$, $D_1 D_1\pi$ using QCD sum rules. These couplings are important inputs in the meson exchange model calculations used to estimate the amount of $J/\psi$ absorption due to pions and rho mesons in heavy ion collisions. Our sum rules are constructed at the first order in the pion momentum $p_\mu$, which give the couplings that are not trivially related to the soft-pion theorem. Our calculated couplings, which somewhat depend upon the values of the heavy meson decay constants, are $g_{DD^*\pi}=8.2 \pm 0.1$, $g_{D_1 D^* \pi} = 15.8 \pm 2 {\rm GeV}$, $g_{D^* D^* \pi}= 0.3 \pm 0.03$ and $g_{D_1 D_1 \pi}= 0.17 \pm 0.04$. |
2106.08611 | Jorge Baeza-Ballesteros | J. Baeza-Ballesteros, A. Donini, S. Nadal-Gisbert | Dynamical measurements of deviations from Newton's $1/r^2$ law | Two-column format (26 pages), 18 figures. Matches published version.
References added, new appendix and minor corrections | Eur. Phys. J. C 82, 154 (2022) | 10.1140/epjc/s10052-022-10086-6 | null | hep-ph gr-qc hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous work (arXiv:1609.05654v2), an experimental setup aiming at the
measurement of deviations from the Newtonian $1/r^2$ distance dependence of
gravitational interactions was proposed. The theoretical idea behind this setup
was to study the trajectories of a "Satellite" with a mass $m_{\rm S} \sim
{\cal O}(10^{-9})$ $\mathrm{g}$ around a "Planet" with mass $m_{\rm P} \in
[10^{-7},10^{-5} ]$ $\mathrm{g}$, looking for precession of the orbit. The
observation of such feature induced by gravitational interactions would be an
unambiguous indication of a gravitational potential with terms different from
$1/r$ and, thus, a powerful tool to detect deviations from Newton's $1/r^2$
law. In this paper we optimize the proposed setup in order to achieve maximal
sensitivity to look for {\em Beyond-Newtonian} corrections. We study in detail
possible background sources that could induce precession and quantify their
impact on the achievable sensitivity. We conclude that a dynamical measurement
of deviations from newtonianity can test Yukawa-like corrections to the $1/r$
potential with strength as low as $\alpha \sim 10^{-2}$ for distances as small
as $\lambda \sim 10 \, \mu\mathrm{m}$.
| [
{
"created": "Wed, 16 Jun 2021 08:11:21 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Feb 2022 11:56:17 GMT",
"version": "v2"
}
] | 2022-02-28 | [
[
"Baeza-Ballesteros",
"J.",
""
],
[
"Donini",
"A.",
""
],
[
"Nadal-Gisbert",
"S.",
""
]
] | In a previous work (arXiv:1609.05654v2), an experimental setup aiming at the measurement of deviations from the Newtonian $1/r^2$ distance dependence of gravitational interactions was proposed. The theoretical idea behind this setup was to study the trajectories of a "Satellite" with a mass $m_{\rm S} \sim {\cal O}(10^{-9})$ $\mathrm{g}$ around a "Planet" with mass $m_{\rm P} \in [10^{-7},10^{-5} ]$ $\mathrm{g}$, looking for precession of the orbit. The observation of such feature induced by gravitational interactions would be an unambiguous indication of a gravitational potential with terms different from $1/r$ and, thus, a powerful tool to detect deviations from Newton's $1/r^2$ law. In this paper we optimize the proposed setup in order to achieve maximal sensitivity to look for {\em Beyond-Newtonian} corrections. We study in detail possible background sources that could induce precession and quantify their impact on the achievable sensitivity. We conclude that a dynamical measurement of deviations from newtonianity can test Yukawa-like corrections to the $1/r$ potential with strength as low as $\alpha \sim 10^{-2}$ for distances as small as $\lambda \sim 10 \, \mu\mathrm{m}$. |
1001.3987 | Sven-Olaf Moch | S. Moch, U. Langenfeld, P. Uwer | The top-quark's running mass | 6 pages, 2 figures; to appear in Proceedings of the 9th International
Symposium on Radiative Corrections, RADCOR 2009, Ascona, Switzerland, October
2009 | null | null | DESY 10-009, HU-EP-10/04, SFB/CPP-10-15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the direct determination of the running top-quark mass from
measurements of the total cross section of hadronic top-quark pair-production.
The theory predictions in the MSbar scheme are very stable under scale
variations and show rapid apparent convergence of the perturbative expansion.
These features are explained by studying the underlying parton dynamics.
| [
{
"created": "Fri, 22 Jan 2010 13:36:33 GMT",
"version": "v1"
}
] | 2010-01-25 | [
[
"Moch",
"S.",
""
],
[
"Langenfeld",
"U.",
""
],
[
"Uwer",
"P.",
""
]
] | We discuss the direct determination of the running top-quark mass from measurements of the total cross section of hadronic top-quark pair-production. The theory predictions in the MSbar scheme are very stable under scale variations and show rapid apparent convergence of the perturbative expansion. These features are explained by studying the underlying parton dynamics. |
hep-ph/0307188 | Gavin Salam | M. Ciafaloni, D. Colferai, G. P. Salam and A. M. Stasto | Renormalisation group improved small-x Green's function | 59 pages, 19 figures | Phys.Rev.D68:114003,2003 | 10.1103/PhysRevD.68.114003 | DESY 03-060, DFF 404/05/03, LPTHE-03-20 | hep-ph | null | We investigate the basic features of the gluon density predicted by a
renormalisation group improved small-x equation which incorporates both the
gluon splitting function at leading collinear level and the exact BFKL kernel
at next-to-leading level. We provide resummed results for the Green's function
and its hard Pomeron exponent $\omega_s(\alpha_s)$, and for the splitting
function and its critical exponent $\omega_c(\alpha_s)$. We find that
non-linear resummation effects considerably extend the validity of the hard
Pomeron regime by decreasing diffusion corrections to the Green's function
exponent and by slowing down the drift towards the non-perturbative Pomeron
regime. As in previous analyses, the resummed exponents are reduced to
phenomenologically interesting values. Furthermore, significant preasymptotic
effects are observed. In particular, the resummed splitting function departs
from the DGLAP result in the moderate small-x region, showing a shallow dip
followed by the expected power increase in the very small-x region. Finally, we
outline the extension of the resummation procedure to include the photon impact
factors.
| [
{
"created": "Tue, 15 Jul 2003 09:52:29 GMT",
"version": "v1"
}
] | 2010-03-25 | [
[
"Ciafaloni",
"M.",
""
],
[
"Colferai",
"D.",
""
],
[
"Salam",
"G. P.",
""
],
[
"Stasto",
"A. M.",
""
]
] | We investigate the basic features of the gluon density predicted by a renormalisation group improved small-x equation which incorporates both the gluon splitting function at leading collinear level and the exact BFKL kernel at next-to-leading level. We provide resummed results for the Green's function and its hard Pomeron exponent $\omega_s(\alpha_s)$, and for the splitting function and its critical exponent $\omega_c(\alpha_s)$. We find that non-linear resummation effects considerably extend the validity of the hard Pomeron regime by decreasing diffusion corrections to the Green's function exponent and by slowing down the drift towards the non-perturbative Pomeron regime. As in previous analyses, the resummed exponents are reduced to phenomenologically interesting values. Furthermore, significant preasymptotic effects are observed. In particular, the resummed splitting function departs from the DGLAP result in the moderate small-x region, showing a shallow dip followed by the expected power increase in the very small-x region. Finally, we outline the extension of the resummation procedure to include the photon impact factors. |
1105.0279 | Carsten M\"uller | Huayu Hu and Carsten M\"uller | Relativistic three-body recombination with the QED vacuum | 5 pages, 4 figures | null | 10.1103/PhysRevLett.107.090402 | null | hep-ph physics.atom-ph physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electron-positron pair annihilation into a single photon is studied when a
second free electron is present. Focussing on the relativistic regime, we show
that the photon emitted in the three-lepton interaction may exhibit distinct
angular distributions and polarization properties. Moreover, the process can
dominate over two-photon annihilation in relativistic electron-positron plasmas
of few-MeV temperature. An analogy with three-body recombination of electrons
with ions is drawn.
| [
{
"created": "Mon, 2 May 2011 09:36:15 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Hu",
"Huayu",
""
],
[
"Müller",
"Carsten",
""
]
] | Electron-positron pair annihilation into a single photon is studied when a second free electron is present. Focussing on the relativistic regime, we show that the photon emitted in the three-lepton interaction may exhibit distinct angular distributions and polarization properties. Moreover, the process can dominate over two-photon annihilation in relativistic electron-positron plasmas of few-MeV temperature. An analogy with three-body recombination of electrons with ions is drawn. |
2211.11414 | Aleksi Kurkela | Aleksi Kurkela | Thoughts about the utility of perturbative QCD in the cores of neutron
stars | 13 pages, 6 figures, zero equations. Contribution to a roundtable
discussion on "neutron stars and QCD" at the 15th Quark Confinement and the
Hadron Spectrum Conference (ConfXV) | null | null | null | hep-ph astro-ph.HE nucl-th | http://creativecommons.org/licenses/by/4.0/ | In this contribution, I discuss the utility that perturbative QCD offers in
studying the matter in the cores of neutron stars. I discuss the reasons why
perturbative QCD can constrain the equation of state at densities far below the
densities where we can perform controlled calculations. I discuss how
perturbative QCD can inform nuclear modelling of neutron stars and how it
influences equation-of-state inference. And finally, I discuss the implications
to the QCD phase diagram and argue that interesting features in the equation of
state revealed by the QCD input may be used to argue for the existence of
quark-matter cores in most massive neutron stars.
| [
{
"created": "Mon, 21 Nov 2022 12:57:41 GMT",
"version": "v1"
}
] | 2022-11-22 | [
[
"Kurkela",
"Aleksi",
""
]
] | In this contribution, I discuss the utility that perturbative QCD offers in studying the matter in the cores of neutron stars. I discuss the reasons why perturbative QCD can constrain the equation of state at densities far below the densities where we can perform controlled calculations. I discuss how perturbative QCD can inform nuclear modelling of neutron stars and how it influences equation-of-state inference. And finally, I discuss the implications to the QCD phase diagram and argue that interesting features in the equation of state revealed by the QCD input may be used to argue for the existence of quark-matter cores in most massive neutron stars. |
hep-ph/9904483 | Adam Ritz | M. Pospelov and A. Ritz | Theta-Induced Electric Dipole Moment of the Neutron via QCD Sum Rules | 4 pages, RevTeX: v2: typos corrected; v3: missing overall factor of
two reinstated | Phys.Rev.Lett.83:2526-2529,1999 | 10.1103/PhysRevLett.83.2526 | TPI-MINN-99/24, UMN-TH-1761-99 | hep-ph | null | Using the QCD sum rule approach, we calculate the electric dipole moment of
the neutron induced by a vacuum theta--angle to approximately 40-50% precision,
d_n = 2.4 x 10^{-16} \theta e.cm. Combined with the new experimental bound,
this translates into the limit |\theta|< 3 x 10^{-10}.
| [
{
"created": "Wed, 28 Apr 1999 19:38:36 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 1999 17:24:08 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Apr 2005 13:24:38 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Pospelov",
"M.",
""
],
[
"Ritz",
"A.",
""
]
] | Using the QCD sum rule approach, we calculate the electric dipole moment of the neutron induced by a vacuum theta--angle to approximately 40-50% precision, d_n = 2.4 x 10^{-16} \theta e.cm. Combined with the new experimental bound, this translates into the limit |\theta|< 3 x 10^{-10}. |
1706.08585 | Boris Blok | B. Blok (1), Yu. Dokshitzer (2), M. Strikman (3) ((1) Technion, (2)
LPTHE, (3) Penn State) | Rapidity distribution of particle multiplicity in DIS at small x | 14 pages, 6 Figures. Abstract extended, minor misprints corrected,
derivations improved and explanations are streamlined. Published in Physics
Letters, B/ | null | 10.1016/j.physletb.2017.09.038 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analytical study of the rapidity distribution of the final state particles in
deep inelastic scattering at small x is presented. We separate and analyse
three sources of particle production: fragmentation of the quark-antiquark
pair, accompanying coherent soft gluon radiation due to octet color exchange in
the t-channel, and fragmentation of gluons that form parton distribution
functions. Connection to Catani-Ciafaloni-Fiorani-Marchesini (CCFM) equations
and the role of gluon reggezation are also discussed.
| [
{
"created": "Mon, 26 Jun 2017 20:35:15 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Sep 2017 22:46:07 GMT",
"version": "v2"
}
] | 2017-10-11 | [
[
"Blok",
"B.",
""
],
[
"Dokshitzer",
"Yu.",
""
],
[
"Strikman",
"M.",
""
]
] | Analytical study of the rapidity distribution of the final state particles in deep inelastic scattering at small x is presented. We separate and analyse three sources of particle production: fragmentation of the quark-antiquark pair, accompanying coherent soft gluon radiation due to octet color exchange in the t-channel, and fragmentation of gluons that form parton distribution functions. Connection to Catani-Ciafaloni-Fiorani-Marchesini (CCFM) equations and the role of gluon reggezation are also discussed. |
hep-ph/9808467 | Joey Huston | L. Apanasevich, C. Balazs, C. Bromberg, J. Huston, A. Maul, W. K. Tung
(Michigan State U.), S. Kuhlmann (Argonne National Lab.), J. Owens (Florida
State U.), M. Begel, T. Ferbel, G. Ginther, P. Slattery, M. Zielinski (U. of
Rochester) | kt Effects in Direct-Photon Production | LaTeX, uses revtex and epsf, 37 pages, 15 figures | Phys. Rev. D 59, 074007 (1999) | 10.1103/PhysRevD.59.074007 | CTEQ-805, MSUHEP-80501, UR-1539 | hep-ph | null | We discuss the phenomenology of initial-state parton-kt broadening in
direct-photon production and related processes in hadron collisions. After a
brief summary of the theoretical basis for a Gaussian-smearing approach, we
present a systematic study of recent results on fixed-target and collider
direct-photon production, using complementary data on diphoton and pion
production to provide empirical guidance on the required amount of kt
broadening. This approach provides a consistent description of the observed
pattern of deviation of next-to-leading order QCD calculations relative to the
direct-photon data, and accounts for the shape and normalization difference
between fixed-order perturbative calculations and the data. We also discuss the
uncertainties in this phenomenological approach, the implications of these
results on the extraction of the gluon distribution of the nucleon, and the
comparison of our findings to recent related work.
| [
{
"created": "Fri, 28 Aug 1998 20:35:51 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Apanasevich",
"L.",
"",
"Michigan State U."
],
[
"Balazs",
"C.",
"",
"Michigan State U."
],
[
"Bromberg",
"C.",
"",
"Michigan State U."
],
[
"Huston",
"J.",
"",
"Michigan State U."
],
[
"Maul",
"A.",
"",
"Michigan State U."
],
[
"Tung",
"W. K.",
"",
"Michigan State U."
],
[
"Kuhlmann",
"S.",
"",
"Argonne National Lab."
],
[
"Owens",
"J.",
"",
"Florida\n State U."
],
[
"Begel",
"M.",
"",
"U. of\n Rochester"
],
[
"Ferbel",
"T.",
"",
"U. of\n Rochester"
],
[
"Ginther",
"G.",
"",
"U. of\n Rochester"
],
[
"Slattery",
"P.",
"",
"U. of\n Rochester"
],
[
"Zielinski",
"M.",
"",
"U. of\n Rochester"
]
] | We discuss the phenomenology of initial-state parton-kt broadening in direct-photon production and related processes in hadron collisions. After a brief summary of the theoretical basis for a Gaussian-smearing approach, we present a systematic study of recent results on fixed-target and collider direct-photon production, using complementary data on diphoton and pion production to provide empirical guidance on the required amount of kt broadening. This approach provides a consistent description of the observed pattern of deviation of next-to-leading order QCD calculations relative to the direct-photon data, and accounts for the shape and normalization difference between fixed-order perturbative calculations and the data. We also discuss the uncertainties in this phenomenological approach, the implications of these results on the extraction of the gluon distribution of the nucleon, and the comparison of our findings to recent related work. |
hep-ph/9709351 | Slava Ilyin | E.Gabrielli, V.A.Ilyin and B.Mele | $Z\gamma H$ Vertex Effects at Future Colliders | 5 pages (standard LaTeX code); Talk given at "Beyond the Standard
Model V" Conference, April 29 - May 4 1997, Balholm (Norway); to be published
in the Proceedings | null | 10.1063/1.54487 | null | hep-ph | null | We show that the Higgs production in $e\gamma$ collisions, through the
one-loop reaction $e\gamma\to eH$ at large transverse momentum, can provide a
precise determination of the $Z\gamma H$ vertex. We concentrate on the analysis
of signal rates vs background looking for strategies to improve the ratio
$S/B$. Possible bounds on anomalous contributions to the $Z\gamma H$ vertex are
derived.
| [
{
"created": "Mon, 15 Sep 1997 17:23:11 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Gabrielli",
"E.",
""
],
[
"Ilyin",
"V. A.",
""
],
[
"Mele",
"B.",
""
]
] | We show that the Higgs production in $e\gamma$ collisions, through the one-loop reaction $e\gamma\to eH$ at large transverse momentum, can provide a precise determination of the $Z\gamma H$ vertex. We concentrate on the analysis of signal rates vs background looking for strategies to improve the ratio $S/B$. Possible bounds on anomalous contributions to the $Z\gamma H$ vertex are derived. |
1212.6715 | Sarben Sarkar | Carl M. Bender, Nick E. Mavromatos, and Sarben Sarkar | Asymptotic Analysis of the Boltzmann Equation for Dark Matter Relics in
the presence of a Running Dilaton and Space-Time Defects | null | Phys. Rev. D 87, 055021 (2013) | 10.1103/PhysRevD.87.055021 | KCL-PH-TH-2012-31, LCTS/2012-15, CERN-PH-TH-2012-207 | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interplay of dilatonic effects in dilaton cosmology and stochastic
quantum space-time defects within the framework of string/brane cosmologies is
examined. The Boltzmann equation describes the physics of thermal
dark-matter-relic abundances in the presence of rolling dilatons. These
dilatons affect the coupling of stringy matter to D-particle defects, which are
generic in string theory. This coupling leads to an additional source term in
the Boltzmann equation. The techniques of asymptotic matching and
boundary-layer theory, which were recently applied by two of the authors (CMB
and SS) to a Boltzmann equation, are used here to find the detailed asymptotic
relic abundances for all ranges of the expectation value of the dilaton field.
The phenomenological implications for the search of supersymmetric dark matter
in current colliders, such as the LHC, are discussed.
| [
{
"created": "Sun, 30 Dec 2012 13:26:52 GMT",
"version": "v1"
}
] | 2013-05-02 | [
[
"Bender",
"Carl M.",
""
],
[
"Mavromatos",
"Nick E.",
""
],
[
"Sarkar",
"Sarben",
""
]
] | The interplay of dilatonic effects in dilaton cosmology and stochastic quantum space-time defects within the framework of string/brane cosmologies is examined. The Boltzmann equation describes the physics of thermal dark-matter-relic abundances in the presence of rolling dilatons. These dilatons affect the coupling of stringy matter to D-particle defects, which are generic in string theory. This coupling leads to an additional source term in the Boltzmann equation. The techniques of asymptotic matching and boundary-layer theory, which were recently applied by two of the authors (CMB and SS) to a Boltzmann equation, are used here to find the detailed asymptotic relic abundances for all ranges of the expectation value of the dilaton field. The phenomenological implications for the search of supersymmetric dark matter in current colliders, such as the LHC, are discussed. |
hep-ph/9509430 | Kiwoon Choi | Kiwoon Choi | Goldstone Supermultiplet as the Messenger of Supersymmetry Breaking | 12 pages, Revtex | Phys.Rev.D54:6591-6595,1996 | 10.1103/PhysRevD.54.6591 | KAIST-CHEP-95/16 | hep-ph | null | We consider supersymmetric models in which a (pseudo) Goldstone
supermultiplet plays the role of the messenger of supersymmetry breaking. Such
models lead to a highly predictive form of flavor and CP conserving soft terms,
particularly the soft scalar masses and trilinear couplings vanish at the scale
where the (approximate) global symmetry is spontaneously broken. We discuss
also the possibility for realizing this scheme in supergravity models derived
from string theories.
| [
{
"created": "Sun, 1 Oct 1995 01:57:48 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Choi",
"Kiwoon",
""
]
] | We consider supersymmetric models in which a (pseudo) Goldstone supermultiplet plays the role of the messenger of supersymmetry breaking. Such models lead to a highly predictive form of flavor and CP conserving soft terms, particularly the soft scalar masses and trilinear couplings vanish at the scale where the (approximate) global symmetry is spontaneously broken. We discuss also the possibility for realizing this scheme in supergravity models derived from string theories. |
1509.07118 | Prerit Jaiswal | Prerit Jaiswal, Patrick Meade, Harikrishnan Ramani | Precision diboson measurements and the interplay of pT and jet-veto
resummations | 14 TeV analysis replaced with 13 TeV, minor changes in text. Version
published in PRD | Phys. Rev. D 93, 093007 (2016) | 10.1103/PhysRevD.93.093007 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we demonstrate the agreement of jet-veto resummation and pT
resummation for explaining the WW cross sections at Run 1 of the LHC, and in
the future. These two resummation techniques resum different logarithms,
however via reweighting methods they can be compared for various differential
or exclusive cross sections. We find excellent agreement between the two
resummation methods for predicting the zero-jet cross section, and propose a
new reweighting method for jet-veto resummation that can be used to compare
other differential distributions. We advocate a cross-channel comparison for
the high-luminosity run of the LHC as both a test of QCD and new physics.
| [
{
"created": "Wed, 23 Sep 2015 20:04:45 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jun 2016 18:28:41 GMT",
"version": "v2"
}
] | 2016-06-03 | [
[
"Jaiswal",
"Prerit",
""
],
[
"Meade",
"Patrick",
""
],
[
"Ramani",
"Harikrishnan",
""
]
] | In this paper we demonstrate the agreement of jet-veto resummation and pT resummation for explaining the WW cross sections at Run 1 of the LHC, and in the future. These two resummation techniques resum different logarithms, however via reweighting methods they can be compared for various differential or exclusive cross sections. We find excellent agreement between the two resummation methods for predicting the zero-jet cross section, and propose a new reweighting method for jet-veto resummation that can be used to compare other differential distributions. We advocate a cross-channel comparison for the high-luminosity run of the LHC as both a test of QCD and new physics. |
1908.00829 | Avik Paul | Avik Paul, Biswajit Banerjee, Debasish Majumdar | Gravitational wave signatures from an extended inert doublet dark matter
model | 28 pages, 6 figures and 2 tables | null | 10.1088/1475-7516/2019/10/062 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a particle dark matter model by extending the scalar sector of
the Standard Model by an additional SU(2) scalar doublet which is made "inert"
(and stable) by imposing a discrete $Z_2$ symmetry under which the additional
scalar doublet is odd (and the SM is even) and it does not develop any vacuum
expectation value (VEV). The lightest inert particle (LIP) of this inert
doublet model (IDM) can be a viable candidate for Dark Matter. The IDM model is
further extended by an additional singlet scalar which is also even under $Z_2$
and develop a VEV on spontaneous symmetry breaking. This additional scalar
singlet mixes with SM Higgs and on diagonalisation of the mass matrix two CP
even scalar eigenstates are obtained one of which is attributed to the physical
Higgs (with mass 125.09 GeV). The LIP is the dark matter candidate in the
extended model. For such a particle dark matter model we explore the
first-order electroweak phase transition and the consequent production of
Gravitational Waves (GW) at that epoch of the early Universe and calculate the
intensities and frequencies for such waves. We then investigate the detection
possibilities of such GWs at the future spaceborne primordial GW detectors such
as eLISA, BBO, ALIA, DECIGO, U-DECIGO and ground-based detector aLIGO.
| [
{
"created": "Fri, 2 Aug 2019 12:55:38 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Aug 2019 11:17:38 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Nov 2019 14:37:01 GMT",
"version": "v3"
}
] | 2019-11-14 | [
[
"Paul",
"Avik",
""
],
[
"Banerjee",
"Biswajit",
""
],
[
"Majumdar",
"Debasish",
""
]
] | We consider a particle dark matter model by extending the scalar sector of the Standard Model by an additional SU(2) scalar doublet which is made "inert" (and stable) by imposing a discrete $Z_2$ symmetry under which the additional scalar doublet is odd (and the SM is even) and it does not develop any vacuum expectation value (VEV). The lightest inert particle (LIP) of this inert doublet model (IDM) can be a viable candidate for Dark Matter. The IDM model is further extended by an additional singlet scalar which is also even under $Z_2$ and develop a VEV on spontaneous symmetry breaking. This additional scalar singlet mixes with SM Higgs and on diagonalisation of the mass matrix two CP even scalar eigenstates are obtained one of which is attributed to the physical Higgs (with mass 125.09 GeV). The LIP is the dark matter candidate in the extended model. For such a particle dark matter model we explore the first-order electroweak phase transition and the consequent production of Gravitational Waves (GW) at that epoch of the early Universe and calculate the intensities and frequencies for such waves. We then investigate the detection possibilities of such GWs at the future spaceborne primordial GW detectors such as eLISA, BBO, ALIA, DECIGO, U-DECIGO and ground-based detector aLIGO. |
1603.05514 | Cristina Manuel | Cristina Manuel, Joan Soto and Stephan Stetina | The on-shell effective field theory: a systematic tool to compute power
corrections to the hard thermal loops | 34 pages; 2 figures. v4; numerical errors in transverse functions
corrected | Phys. Rev. D 94, 025017 (2016) | 10.1103/PhysRevD.94.025017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that effective field theory techniques can be efficiently used to
compute power corrections to the hard thermal loops (HTL) in a high temperature
T expansion. To this aim, we use the recently proposed on-shell effective field
theory (OSEFT), which describes the quantum fluctuations around on-shell
degrees of freedom. We provide the OSEFT Lagrangian up to third order in the
energy expansion for QED, and use it for the computation of power corrections
to the retarded photon polarization tensor for soft external momenta. Here soft
denotes a scale of order $eT$, where $e$ is the gauge coupling constant. We
develop the necessary techniques to perform these computations, and study the
contributions to the polarization tensor proportional to $e^2 T^2$, $e^2 T$ and
$e^2 T^0$. The first one describes the HTL contribution, the second one
vanishes, while the third one provides corrections of order $e^2$ to the soft
photon propagation. We check that the results agree with the direct calculation
from QED, up to local pieces, as expected in an effective field theory.
| [
{
"created": "Thu, 17 Mar 2016 14:46:43 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Apr 2016 07:28:33 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jul 2016 10:40:22 GMT",
"version": "v3"
},
{
"created": "Fri, 24 Nov 2017 09:19:15 GMT",
"version": "v4"
}
] | 2017-11-27 | [
[
"Manuel",
"Cristina",
""
],
[
"Soto",
"Joan",
""
],
[
"Stetina",
"Stephan",
""
]
] | We show that effective field theory techniques can be efficiently used to compute power corrections to the hard thermal loops (HTL) in a high temperature T expansion. To this aim, we use the recently proposed on-shell effective field theory (OSEFT), which describes the quantum fluctuations around on-shell degrees of freedom. We provide the OSEFT Lagrangian up to third order in the energy expansion for QED, and use it for the computation of power corrections to the retarded photon polarization tensor for soft external momenta. Here soft denotes a scale of order $eT$, where $e$ is the gauge coupling constant. We develop the necessary techniques to perform these computations, and study the contributions to the polarization tensor proportional to $e^2 T^2$, $e^2 T$ and $e^2 T^0$. The first one describes the HTL contribution, the second one vanishes, while the third one provides corrections of order $e^2$ to the soft photon propagation. We check that the results agree with the direct calculation from QED, up to local pieces, as expected in an effective field theory. |
2203.02612 | Angel Gomez Nicola | Angel G\'omez Nicola, Jacobo Ruiz de Elvira, Andrea Vioque-Rodr\'iguez | Thermal hadron resonances in chiral and $U(1)_A$ restoration | 6 pages, 2 figures, contribution to the proceedings of the 19th
International Conference on Hadron Spectroscopy and Structure (HADRON 2021).
Accepted for publication in Suplemento de la Revista Mexicana de F\'isica | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent work on thermal resonances and their connection with chiral
symmetry and $U(1)_A$ restoration within the QCD phase diagram. In particular,
the $f_0(500)$ and $K_0^* (700)$ states generated from $\pi\pi$ and $\pi K$
scattering within Unitarized Chiral Perturbation Theory (ChPT) at finite
temperature allow one to describe scalar susceptibilities, which combined with
Ward Identities yield interesting conclusions regarding the interplay between
chiral and $U(1)_A$ restoration, key to understand the nature of the transition
| [
{
"created": "Fri, 4 Mar 2022 23:51:58 GMT",
"version": "v1"
}
] | 2022-03-08 | [
[
"Nicola",
"Angel Gómez",
""
],
[
"de Elvira",
"Jacobo Ruiz",
""
],
[
"Vioque-Rodríguez",
"Andrea",
""
]
] | We review recent work on thermal resonances and their connection with chiral symmetry and $U(1)_A$ restoration within the QCD phase diagram. In particular, the $f_0(500)$ and $K_0^* (700)$ states generated from $\pi\pi$ and $\pi K$ scattering within Unitarized Chiral Perturbation Theory (ChPT) at finite temperature allow one to describe scalar susceptibilities, which combined with Ward Identities yield interesting conclusions regarding the interplay between chiral and $U(1)_A$ restoration, key to understand the nature of the transition |
1004.0192 | Ernest Ma | Ernest Ma (UC Riverside) | Utilitarian Supersymmetric Gauge Model of Particle Interactions | 9 pages, no figure | Phys.Rev.D81:097701,2010 | 10.1103/PhysRevD.81.097701 | UCRHEP-T489 (April 2010) | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A remarkable U(1) gauge extension of the supersymmetric standard model was
proposed eight years ago. It is anomaly-free, has no mu term, and conserves
baryon and lepton numbers automatically. The phenomenology of a specific
version of this model is discussed. In particular, leptoquarks are predicted,
with couplings to the heavy singlet neutrinos, the scalar partners of which may
be components of dark matter. The Majorana neutrino mass matrix itself may have
two zero subdeterminants.
| [
{
"created": "Thu, 1 Apr 2010 18:00:38 GMT",
"version": "v1"
}
] | 2010-05-19 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | A remarkable U(1) gauge extension of the supersymmetric standard model was proposed eight years ago. It is anomaly-free, has no mu term, and conserves baryon and lepton numbers automatically. The phenomenology of a specific version of this model is discussed. In particular, leptoquarks are predicted, with couplings to the heavy singlet neutrinos, the scalar partners of which may be components of dark matter. The Majorana neutrino mass matrix itself may have two zero subdeterminants. |
1110.3210 | Luca Di Luzio | Luca Di Luzio | Aspects of symmetry breaking in Grand Unified Theories | Ph.D. Thesis (SISSA, Trieste), 227 pages, 33 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the issue of spontaneous symmetry breaking in SO(10) grand
unified theories. The emphasis is put on the quest for the minimal Higgs sector
leading to a phenomenologically viable breaking to the standard model gauge
group. Longstanding results claimed that nonsupersymmetric SO(10) models with
just the adjoint representation triggering the first stage of the breaking
cannot provide a successful gauge unification. The main result of this thesis
is the observation that this no-go is an artifact of the tree level potential
and that quantum corrections opens in a natural way the vacuum patterns
favoured by gauge coupling unification. An analogous no-go, preventing the
breaking of SO(10) at the renormalizable level with representations up to the
adjoint, holds in the supersymmetric case as well. In this respect we show that
a possible way-out is provided by considering the flipped SO(10) embedding of
the hypercharge. Finally, the case is made for the hunting of the minimal
SO(10) theory.
| [
{
"created": "Fri, 14 Oct 2011 13:46:00 GMT",
"version": "v1"
}
] | 2011-10-17 | [
[
"Di Luzio",
"Luca",
""
]
] | We reconsider the issue of spontaneous symmetry breaking in SO(10) grand unified theories. The emphasis is put on the quest for the minimal Higgs sector leading to a phenomenologically viable breaking to the standard model gauge group. Longstanding results claimed that nonsupersymmetric SO(10) models with just the adjoint representation triggering the first stage of the breaking cannot provide a successful gauge unification. The main result of this thesis is the observation that this no-go is an artifact of the tree level potential and that quantum corrections opens in a natural way the vacuum patterns favoured by gauge coupling unification. An analogous no-go, preventing the breaking of SO(10) at the renormalizable level with representations up to the adjoint, holds in the supersymmetric case as well. In this respect we show that a possible way-out is provided by considering the flipped SO(10) embedding of the hypercharge. Finally, the case is made for the hunting of the minimal SO(10) theory. |
2110.04746 | Yin Huang | Cai Cheng, Feng Yang and Yin Huang | Searching for strange hidden-charm pentaquark state $P_{cs}(4459)$ in
$\gamma{}p\to{}K^{+}P_{cs}(4459)$ reaction | arXiv admin note: text overlap with arXiv:2107.03773 | null | 10.1103/PhysRevD.104.116007 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We investigate the possibility of studying the strange hidden-charm
pentaquark state $P_{cs}(4459)$ by photon-induced reactions on a proton target
in an effective Lagrangian approach. The production process is described by the
$t$-channel $K^{-}$ exchange, the $u$-channel $\Lambda$ exchange, the contract
term, and the $s$- channel nucleon pole. Our theoretical approach is based on
the assumption that $P_{cs}(4459)$ with $J^{P}=1/2^{-}$ or $J^{P}=3/2^{-}$ can
be interpreted as a molecule composed of $\bar{D}^{*}\Xi_c$. Using the coupling
constants of the $P^{J^P}_{cs}$ to $\gamma{}\Lambda$ and $K^{-}p$ channels
obtained from molecule picture of the $P^{J^{P}}_{cs}(4459)$, the total
cross-sections of the process $\gamma{}p\to{}P^{J^P}_{cs}K^{+}$ is evaluated.
Our calculation indicates that the cross-section for
$\gamma{}p\to{}P^{1/2^{-}}_{cs}K^{+}$ and $\gamma{}p\to{}P^{3/2^{-}}_{cs}K^{+}$
are of the order of 10.0 pb and 5.0 pb, respectively. In addition, we compute
the cross-section by assuming $P_{cs}(4459)$ as a compact pentaquark and find
it is quite different from the results of $\bar{D}^{*}\Xi_c$ molecule.
Those results can be measured in future experiments, such as the Electron-Ion
Collider in China and the United States. And can be used to test the nature of
the $P_{cs}$.
| [
{
"created": "Sun, 10 Oct 2021 09:48:55 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Nov 2021 07:01:27 GMT",
"version": "v2"
}
] | 2021-12-22 | [
[
"Cheng",
"Cai",
""
],
[
"Yang",
"Feng",
""
],
[
"Huang",
"Yin",
""
]
] | We investigate the possibility of studying the strange hidden-charm pentaquark state $P_{cs}(4459)$ by photon-induced reactions on a proton target in an effective Lagrangian approach. The production process is described by the $t$-channel $K^{-}$ exchange, the $u$-channel $\Lambda$ exchange, the contract term, and the $s$- channel nucleon pole. Our theoretical approach is based on the assumption that $P_{cs}(4459)$ with $J^{P}=1/2^{-}$ or $J^{P}=3/2^{-}$ can be interpreted as a molecule composed of $\bar{D}^{*}\Xi_c$. Using the coupling constants of the $P^{J^P}_{cs}$ to $\gamma{}\Lambda$ and $K^{-}p$ channels obtained from molecule picture of the $P^{J^{P}}_{cs}(4459)$, the total cross-sections of the process $\gamma{}p\to{}P^{J^P}_{cs}K^{+}$ is evaluated. Our calculation indicates that the cross-section for $\gamma{}p\to{}P^{1/2^{-}}_{cs}K^{+}$ and $\gamma{}p\to{}P^{3/2^{-}}_{cs}K^{+}$ are of the order of 10.0 pb and 5.0 pb, respectively. In addition, we compute the cross-section by assuming $P_{cs}(4459)$ as a compact pentaquark and find it is quite different from the results of $\bar{D}^{*}\Xi_c$ molecule. Those results can be measured in future experiments, such as the Electron-Ion Collider in China and the United States. And can be used to test the nature of the $P_{cs}$. |
1106.2008 | Renato Campanini | Renato Campanini and Gianluca Ferri | Experimental equation of state in proton-proton and proton-antiproton
collisions and phase transition to quark gluon plasma | 26 pages, 6 figures | null | 10.1016/j.physletb.2011.08.009 | AMS ACTA 3041 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We deduce approximate equations of state from experimental measurements in
proton-proton and proton-antiproton collisions. Thermodynamic quantities are
estimated combining the measure of average transverse momentum <pt> vs
pseudorapidity density dN/deta with the estimation of the interaction region
size from measures of Bose Einstein correlation, or from a theoretical model
which relates dN/deta to the impact parameter. The results are very similar to
theory predictions in case of crossover from hadron gas to quark gluon plasma.
According to our analysis, the possible crossover should start at dN/deta about
6 and end at dN/deta about 24.
| [
{
"created": "Fri, 10 Jun 2011 10:28:35 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2011 13:28:00 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Campanini",
"Renato",
""
],
[
"Ferri",
"Gianluca",
""
]
] | We deduce approximate equations of state from experimental measurements in proton-proton and proton-antiproton collisions. Thermodynamic quantities are estimated combining the measure of average transverse momentum <pt> vs pseudorapidity density dN/deta with the estimation of the interaction region size from measures of Bose Einstein correlation, or from a theoretical model which relates dN/deta to the impact parameter. The results are very similar to theory predictions in case of crossover from hadron gas to quark gluon plasma. According to our analysis, the possible crossover should start at dN/deta about 6 and end at dN/deta about 24. |
2209.14953 | Yan-Qing Ma | Xiang Chen, Xin Guan, Chuan-Qi He, Zhao Li, Xiao Liu, Yan-Qing Ma | Complete two-loop electroweak corrections to $e^+e^-\rightarrow HZ$ | 5 pages, 2 figures. arXiv admin note: text overlap with
arXiv:2209.14259 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We compute the complete two-loop electroweak corrections to the Higgsstralung
process $e^+e^-\rightarrow HZ$ at the future Higgs factory. The Feynman
integrals involved in the computation are decomposed into linear combinations
of a minimal set of master integrals taking advantage of the recent
developments of integral reduction techniques. The master integrals are then
evaluated by differential equations with boundary conditions provided by the
auxiliary mass flow method. Our final result for given $\sqrt{s}$ is expressed
as a piecewise function defined by several deeply expanded power series, which
has high precision and can be further manipulated efficiently. Our calculation
presents the first complete two-loop electroweak corrections for processes with
four external particles.
| [
{
"created": "Thu, 29 Sep 2022 17:16:41 GMT",
"version": "v1"
}
] | 2023-07-12 | [
[
"Chen",
"Xiang",
""
],
[
"Guan",
"Xin",
""
],
[
"He",
"Chuan-Qi",
""
],
[
"Li",
"Zhao",
""
],
[
"Liu",
"Xiao",
""
],
[
"Ma",
"Yan-Qing",
""
]
] | We compute the complete two-loop electroweak corrections to the Higgsstralung process $e^+e^-\rightarrow HZ$ at the future Higgs factory. The Feynman integrals involved in the computation are decomposed into linear combinations of a minimal set of master integrals taking advantage of the recent developments of integral reduction techniques. The master integrals are then evaluated by differential equations with boundary conditions provided by the auxiliary mass flow method. Our final result for given $\sqrt{s}$ is expressed as a piecewise function defined by several deeply expanded power series, which has high precision and can be further manipulated efficiently. Our calculation presents the first complete two-loop electroweak corrections for processes with four external particles. |
1605.03070 | Sergey Koshkarev | Sergey Koshkarev and Vladimir Anikeev | Production of the Doubly Charmed Baryons at the SELEX experiment -- The
double intrinsic charm approach | The text is as published in Physics Letters B | Physics Letters B 765, 171-174 (2017) | 10.1016/j.physletb.2016.12.010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The high production rate and $\langle x_{F} \rangle > 0.33$ of the doubly
charmed baryons measured by the SELEX experiment is not amenable to
perturbative QCD analysis. In this paper we calculate the production of the
doubly heavy baryons with the double intrinsic charm Fock states whose
existence is rigorously predicted by QCD. The production rate and the
longitudinal momentum distribution are both reproduced. We also show that the
production rates of the doubly charmed baryons and double $J/\psi $ production
observed by NA3 collaboration are comparable. Recent experimental results are
reviewed. The production cross section of the doubly charmed baryons at a
fixed-target experiment at the LHC is presented.
| [
{
"created": "Tue, 10 May 2016 15:53:52 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2016 18:20:17 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Aug 2016 19:25:00 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Dec 2016 20:55:59 GMT",
"version": "v4"
}
] | 2016-12-20 | [
[
"Koshkarev",
"Sergey",
""
],
[
"Anikeev",
"Vladimir",
""
]
] | The high production rate and $\langle x_{F} \rangle > 0.33$ of the doubly charmed baryons measured by the SELEX experiment is not amenable to perturbative QCD analysis. In this paper we calculate the production of the doubly heavy baryons with the double intrinsic charm Fock states whose existence is rigorously predicted by QCD. The production rate and the longitudinal momentum distribution are both reproduced. We also show that the production rates of the doubly charmed baryons and double $J/\psi $ production observed by NA3 collaboration are comparable. Recent experimental results are reviewed. The production cross section of the doubly charmed baryons at a fixed-target experiment at the LHC is presented. |
hep-ph/9811441 | Wolfgang Poeschl | W. Poeschl and B. Mueller | Gauge Lattice Simulation of the soft QGP Dynamics in Ultra-Relativistic
Heavy-Ion Collisions | 4 pages, 7 PS figures, proceed. workshop "Quantum Fields In and Out
of Equilibrium", Brookhaven, Oct. 26-30. 1998 | null | null | DUKE-TH-98-178 | hep-ph astro-ph nucl-th | null | In a fully relativistic approach, a RLSM description of nuclei colliding at
ultra-relativistic energies can be formulated within the framework of a
classical transport theory. The valence quarks of the nucleons are described
through collections of classical point-like particles moving in the continuum.
They are coupled to soft gluon fields which are described through the Yang
Mills equations on a gauge lattice. In a first step, we focus on the range of
low-$p_t$ interactions. Results from numerical model simulations of pure
gluonic nucleus-nucleus collisions on SU(2) gauge lattices in 3+1 dimensions
are presented. They show an effect which we call the glue burst.
| [
{
"created": "Mon, 23 Nov 1998 17:11:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Poeschl",
"W.",
""
],
[
"Mueller",
"B.",
""
]
] | In a fully relativistic approach, a RLSM description of nuclei colliding at ultra-relativistic energies can be formulated within the framework of a classical transport theory. The valence quarks of the nucleons are described through collections of classical point-like particles moving in the continuum. They are coupled to soft gluon fields which are described through the Yang Mills equations on a gauge lattice. In a first step, we focus on the range of low-$p_t$ interactions. Results from numerical model simulations of pure gluonic nucleus-nucleus collisions on SU(2) gauge lattices in 3+1 dimensions are presented. They show an effect which we call the glue burst. |
1910.06747 | Alejandro Gutierrez-Rodriguez | M. Koksal, A. A. Billur, A. Gutierrez-Rodriguez and M. A.
Hernandez-Ruiz | Bounds on the non-standard $W^+W^-\gamma$ couplings at the LHeC and the
FCC-he | 16 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1910.02307, arXiv:1909.10299 | null | 10.1016/j.physletb.2020.135661 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the potential of the $e^-p \to e^-\gamma^*p \to e^-W^-q'X$
($\gamma^*$ is Weizsacker-Willams photon) reaction to probe the non-standard
$W^+W^-\gamma$ couplings at the Large Hadron electron Collider (LHeC) and the
Future Circular Collider-hadron electron (FCC-he). We find $95\%$ confidence
level bounds on the anomalous coupling $\Delta\kappa_\gamma$ and
$\lambda_\gamma$ parameters in the view of effective Lagrangian approach with
various values of the integrated luminosity. We assume center-of-mass energies
of the electron-proton system $\sqrt{s}= 1.30, 1.98, 7.07, 10\hspace{0.8mm}{\rm
TeV}$ and luminosities ${\cal L} = 10-1000 \hspace{0.8mm}{\rm fb^{-1}}$. The
best limits obtained from the process $e^-p \to e^-\gamma^*p \to e^-W^-q'X$ on
the anomalous $\Delta\kappa_\gamma$ and $\lambda_\gamma$ couplings are
$\Delta\kappa_\gamma = |0.00069|$ and $\lambda_\gamma = [-0.0099, 0.0054]$.
These bounds show that the process under consideration is a good prospect for
the searching of the non-standard $\Delta\kappa_\gamma$ and $\lambda_\gamma$
couplings at the LHeC and the FCC-he. In addition, our results provide
complementary information on other results for $\Delta\kappa_\gamma$ and
$\lambda_\gamma$ couplings.
| [
{
"created": "Sat, 12 Oct 2019 17:10:39 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Koksal",
"M.",
""
],
[
"Billur",
"A. A.",
""
],
[
"Gutierrez-Rodriguez",
"A.",
""
],
[
"Hernandez-Ruiz",
"M. A.",
""
]
] | We examine the potential of the $e^-p \to e^-\gamma^*p \to e^-W^-q'X$ ($\gamma^*$ is Weizsacker-Willams photon) reaction to probe the non-standard $W^+W^-\gamma$ couplings at the Large Hadron electron Collider (LHeC) and the Future Circular Collider-hadron electron (FCC-he). We find $95\%$ confidence level bounds on the anomalous coupling $\Delta\kappa_\gamma$ and $\lambda_\gamma$ parameters in the view of effective Lagrangian approach with various values of the integrated luminosity. We assume center-of-mass energies of the electron-proton system $\sqrt{s}= 1.30, 1.98, 7.07, 10\hspace{0.8mm}{\rm TeV}$ and luminosities ${\cal L} = 10-1000 \hspace{0.8mm}{\rm fb^{-1}}$. The best limits obtained from the process $e^-p \to e^-\gamma^*p \to e^-W^-q'X$ on the anomalous $\Delta\kappa_\gamma$ and $\lambda_\gamma$ couplings are $\Delta\kappa_\gamma = |0.00069|$ and $\lambda_\gamma = [-0.0099, 0.0054]$. These bounds show that the process under consideration is a good prospect for the searching of the non-standard $\Delta\kappa_\gamma$ and $\lambda_\gamma$ couplings at the LHeC and the FCC-he. In addition, our results provide complementary information on other results for $\Delta\kappa_\gamma$ and $\lambda_\gamma$ couplings. |
hep-ph/0701211 | Michio Hashimoto | E.V. Gorbar, Michio Hashimoto, V.A. Miransky | Gluonic phases, vector condensates, and exotic hadrons in dense QCD | 33 pages, RevTeX; v.2: Published PRD version | Phys.Rev.D75:085012,2007 | 10.1103/PhysRevD.75.085012 | UWO-TH-07/03 | hep-ph cond-mat.supr-con nucl-th | null | We study the dynamics in phases with vector condensates of gluons (gluonic
phases) in dense two-flavor quark matter. These phases yield an example of
dynamics in which the Higgs mechanism is provided by condensates of gauge (or
gauge plus scalar) fields. Because vacuum expectation values of spatial
components of vector fields break the rotational symmetry, it is naturally to
have a spontaneous breakdown both of external and internal symmetries in this
case. In particular, by using the Ginzburg-Landau approach, we establish the
existence of a gluonic phase with both the rotational symmetry and the
electromagnetic U(1) being spontaneously broken. In other words, this phase
describes an anisotropic medium in which the color and electric
superconductivities coexist. It is shown that this phase corresponds to a
minimum of the Ginzburg-Landau potential and, unlike the two-flavor
superconducting (2SC) phase, it does not suffer from the chromomagnetic
instability. The dual (confinement) description of its dynamics is developed
and it is shown that there are light exotic vector hadrons in the spectrum,
some of which condense. Because most of the initial symmetries in this system
are spontaneously broken, its dynamics is very rich.
| [
{
"created": "Thu, 25 Jan 2007 07:35:20 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Apr 2007 16:47:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gorbar",
"E. V.",
""
],
[
"Hashimoto",
"Michio",
""
],
[
"Miransky",
"V. A.",
""
]
] | We study the dynamics in phases with vector condensates of gluons (gluonic phases) in dense two-flavor quark matter. These phases yield an example of dynamics in which the Higgs mechanism is provided by condensates of gauge (or gauge plus scalar) fields. Because vacuum expectation values of spatial components of vector fields break the rotational symmetry, it is naturally to have a spontaneous breakdown both of external and internal symmetries in this case. In particular, by using the Ginzburg-Landau approach, we establish the existence of a gluonic phase with both the rotational symmetry and the electromagnetic U(1) being spontaneously broken. In other words, this phase describes an anisotropic medium in which the color and electric superconductivities coexist. It is shown that this phase corresponds to a minimum of the Ginzburg-Landau potential and, unlike the two-flavor superconducting (2SC) phase, it does not suffer from the chromomagnetic instability. The dual (confinement) description of its dynamics is developed and it is shown that there are light exotic vector hadrons in the spectrum, some of which condense. Because most of the initial symmetries in this system are spontaneously broken, its dynamics is very rich. |
0707.1268 | Xiao-Hong Wu | Chao-Shang Huang, Xiao-Hong Wu | Direct CP violation of $B \to l \nu$ in unparticle physics | 9 pages, 2 figures, to appear in PRD | Phys.Rev.D77:075014,2008 | 10.1103/PhysRevD.77.075014 | null | hep-ph | null | We have investigated the effects of unparticles in decays $B \to l \nu$. It
is found that the direct CP violation in the decays, which is zero in SM, can
show up due to the CP conserving phase intrinsic in unparticle physics. For
$l=\tau$, the direct CP asymmetry can reach 30% for the scalar unparticle
contribution, and 100% for the longitudinal vector unparticle contribution
under the constraints of ${\rm Br}(B\to\tau\nu)$ and $\nu e$ elastic
scattering. If both unparticle-lepton coupling universality and
unparticle-quark coupling universality are assumed the constraint from
$Br(\pi\to \mu\nu)$ leads that the direct CP violation in $B\to l\nu$ can only
reach at most 8% and 1% for scalar and vector unparticle contributions
respectively if $d_{\cal U} < 2$. If the direct CP violation is observed in the
future it would give strong evidence for the existence of unparticle stuff.
| [
{
"created": "Mon, 9 Jul 2007 14:41:58 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2007 13:44:49 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Mar 2008 07:45:27 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Huang",
"Chao-Shang",
""
],
[
"Wu",
"Xiao-Hong",
""
]
] | We have investigated the effects of unparticles in decays $B \to l \nu$. It is found that the direct CP violation in the decays, which is zero in SM, can show up due to the CP conserving phase intrinsic in unparticle physics. For $l=\tau$, the direct CP asymmetry can reach 30% for the scalar unparticle contribution, and 100% for the longitudinal vector unparticle contribution under the constraints of ${\rm Br}(B\to\tau\nu)$ and $\nu e$ elastic scattering. If both unparticle-lepton coupling universality and unparticle-quark coupling universality are assumed the constraint from $Br(\pi\to \mu\nu)$ leads that the direct CP violation in $B\to l\nu$ can only reach at most 8% and 1% for scalar and vector unparticle contributions respectively if $d_{\cal U} < 2$. If the direct CP violation is observed in the future it would give strong evidence for the existence of unparticle stuff. |
2106.08332 | Jorge C. Romao | Ricardo R. Florentino, Jorge C. Rom\~ao and Jo\~ao P. Silva | Off diagonal charged scalar couplings with the Z boson: the Zee model as
an example | 40 pages, 28 Figures in PDF | null | 10.1140/epjc/s10052-021-09956-2 | CFTP/21-009 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Models with scalar doublets and charged scalar singlets have the interesting
property that they have couplings between one $Z$ boson and two charged scalars
of different masses. This property is often ignored in phenomenological
analysis, as it is absent from models with only extra scalar doublets. We
explore this issue in detail, considering $h \rightarrow Z \gamma$, $B \to X_s
\gamma$, and the decay of a heavy charged scalar into a lighter one and a $Z$
boson. We propose that the latter be actively searched for at the LHC, using
the scalar sector of the Zee model as a prototype and proposing benchmark
points which obey all current experimental data and could be within reach of
the LHC.
| [
{
"created": "Tue, 15 Jun 2021 18:00:01 GMT",
"version": "v1"
}
] | 2022-01-19 | [
[
"Florentino",
"Ricardo R.",
""
],
[
"Romão",
"Jorge C.",
""
],
[
"Silva",
"João P.",
""
]
] | Models with scalar doublets and charged scalar singlets have the interesting property that they have couplings between one $Z$ boson and two charged scalars of different masses. This property is often ignored in phenomenological analysis, as it is absent from models with only extra scalar doublets. We explore this issue in detail, considering $h \rightarrow Z \gamma$, $B \to X_s \gamma$, and the decay of a heavy charged scalar into a lighter one and a $Z$ boson. We propose that the latter be actively searched for at the LHC, using the scalar sector of the Zee model as a prototype and proposing benchmark points which obey all current experimental data and could be within reach of the LHC. |
2311.01507 | Arturo de Giorgi Mr. | A. de Giorgi, S. Vogl | Gravity-Matter Sum Rules in models with a single extra-dimension | 11 pages, 2 figures, 2 tables | null | 10.1007/JHEP05(2024)315 | IFT-UAM/CSIC-23-139 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We prove a set of sum rules needed for KK-graviton pair production from
matter in orbifolded extra-dimensional models. The sum rules can be found in
full generality by considering the properties of solutions to the
Sturm-Liouville problem, which describes the wave functions and the masses of
the KK-gravitons in four dimensions. They ensure cancellations in the
amplitudes of the processes mentioned above which considerably reduce their
growth with $s$ in the high-energy limit. This protects extra-dimensional
theories from the low-scale unitarity problems that plague other theories with
massive spin-2 particles. We argue that such relations are valid for a broader
category of models thus generalizing our previous results that were limited to
the large $\mu$ limit of the Randall-Sundrum model.
| [
{
"created": "Thu, 2 Nov 2023 18:00:06 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Dec 2023 13:47:22 GMT",
"version": "v2"
},
{
"created": "Fri, 31 May 2024 14:10:54 GMT",
"version": "v3"
}
] | 2024-06-03 | [
[
"de Giorgi",
"A.",
""
],
[
"Vogl",
"S.",
""
]
] | We prove a set of sum rules needed for KK-graviton pair production from matter in orbifolded extra-dimensional models. The sum rules can be found in full generality by considering the properties of solutions to the Sturm-Liouville problem, which describes the wave functions and the masses of the KK-gravitons in four dimensions. They ensure cancellations in the amplitudes of the processes mentioned above which considerably reduce their growth with $s$ in the high-energy limit. This protects extra-dimensional theories from the low-scale unitarity problems that plague other theories with massive spin-2 particles. We argue that such relations are valid for a broader category of models thus generalizing our previous results that were limited to the large $\mu$ limit of the Randall-Sundrum model. |
1106.0747 | Christopher Lee | Vincenzo Cirigliano, Christopher Lee, Sean Tulin | Resonant Flavor Oscillations in Electroweak Baryogenesis | 35 pages, 8 figures | null | 10.1103/PhysRevD.84.056006 | MIT-CTP 4269 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electroweak baryogenesis (EWBG) in extensions of the Standard Model will be
tested quantitatively in upcoming nuclear and particle physics experiments, but
only to the extent that theoretical computations are robust. Currently there
exist orders-of-magnitude discrepancies between treatments of charge transport
dynamics during EWBG performed by different groups, each relying on different
sets of approximations. In this work, we introduce a consistent power counting
scheme (in ratios of length scales) for treating systematically the dynamics of
EWBG: CP-asymmetric flavor oscillations, collisions, and diffusion. Within the
context of a simplified model of EWBG, we derive the relevant Boltzmann
equations using non-equilibrium field theory, and solve them exactly without
ansatz for the functional form of the density matrices. We demonstrate the
existence of a resonant enhancement in charge production when the flavor
oscillation length is comparable to the wall thickness. We compare our results
with the existing treatment of EWBG by Konstandin, Prokopec, Schmidt, and Seco
(KPSS) who previously identified the importance of flavor oscillations in EWBG.
We conclude: (i) the power counting of KPSS breaks down in the resonant regime,
and (ii) this leads to substantial underestimation of the charge generated in
the unbroken phase, and potentially of the final baryon asymmetry.
| [
{
"created": "Fri, 3 Jun 2011 20:00:03 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Cirigliano",
"Vincenzo",
""
],
[
"Lee",
"Christopher",
""
],
[
"Tulin",
"Sean",
""
]
] | Electroweak baryogenesis (EWBG) in extensions of the Standard Model will be tested quantitatively in upcoming nuclear and particle physics experiments, but only to the extent that theoretical computations are robust. Currently there exist orders-of-magnitude discrepancies between treatments of charge transport dynamics during EWBG performed by different groups, each relying on different sets of approximations. In this work, we introduce a consistent power counting scheme (in ratios of length scales) for treating systematically the dynamics of EWBG: CP-asymmetric flavor oscillations, collisions, and diffusion. Within the context of a simplified model of EWBG, we derive the relevant Boltzmann equations using non-equilibrium field theory, and solve them exactly without ansatz for the functional form of the density matrices. We demonstrate the existence of a resonant enhancement in charge production when the flavor oscillation length is comparable to the wall thickness. We compare our results with the existing treatment of EWBG by Konstandin, Prokopec, Schmidt, and Seco (KPSS) who previously identified the importance of flavor oscillations in EWBG. We conclude: (i) the power counting of KPSS breaks down in the resonant regime, and (ii) this leads to substantial underestimation of the charge generated in the unbroken phase, and potentially of the final baryon asymmetry. |
1309.1145 | Patrick Stengel | Jason Kumar, Patrick Stengel | WIMPy Leptogenesis With Absorptive Final State Interactions | 17 pages, 3 figures, version to appear in PRD | Phys. Rev. D 89, 055016 (2014) | 10.1103/PhysRevD.89.055016 | UH-511-1216-13 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of leptogenesis models in which the lepton asymmetry
arises from dark matter annihilation processes which violate CP and lepton
number. Importantly, a necessary one-loop contribution to the annihilation
matrix element arises from absorptive final state interactions. We elucidate
the relationship between this one-loop contribution and the CP-violating phase.
As we show, the branching fraction for dark matter annihilation to leptons may
be small in these models, while still generating the necessary asymmetry.
| [
{
"created": "Wed, 4 Sep 2013 19:30:51 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Mar 2014 05:23:05 GMT",
"version": "v2"
}
] | 2014-03-26 | [
[
"Kumar",
"Jason",
""
],
[
"Stengel",
"Patrick",
""
]
] | We consider a class of leptogenesis models in which the lepton asymmetry arises from dark matter annihilation processes which violate CP and lepton number. Importantly, a necessary one-loop contribution to the annihilation matrix element arises from absorptive final state interactions. We elucidate the relationship between this one-loop contribution and the CP-violating phase. As we show, the branching fraction for dark matter annihilation to leptons may be small in these models, while still generating the necessary asymmetry. |
2107.05129 | Sohyun Park | Sohyun Park, Urs Achim Wiedemann | Bremsstrahlung photons from stopping in heavy-ion collisions | 7 pages, 6 figures. v2: matches version published in PRC | Phys. Rev. C 104, 044903 (2021) | 10.1103/PhysRevC.104.044903 | CERN-TH-2021-106 | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We examine the spectrum of bremsstrahlung photons that results from the
stopping of the initial net charge distributions in ultrarelativistic
nucleus-nucleus collisions at the CERN Large Hadron Collier (LHC). This effect
has escaped detection so far since it becomes sizable only at very low
transverse momentum and at sufficiently forward rapidity. We argue that it may
be within reach of the next-generation LHC heavy-ion detector ALICE-3 that is
currently under study, and we comment on the physics motivation for measuring
it.
| [
{
"created": "Sun, 11 Jul 2021 21:01:36 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Oct 2021 16:16:58 GMT",
"version": "v2"
}
] | 2021-10-13 | [
[
"Park",
"Sohyun",
""
],
[
"Wiedemann",
"Urs Achim",
""
]
] | We examine the spectrum of bremsstrahlung photons that results from the stopping of the initial net charge distributions in ultrarelativistic nucleus-nucleus collisions at the CERN Large Hadron Collier (LHC). This effect has escaped detection so far since it becomes sizable only at very low transverse momentum and at sufficiently forward rapidity. We argue that it may be within reach of the next-generation LHC heavy-ion detector ALICE-3 that is currently under study, and we comment on the physics motivation for measuring it. |
1810.11588 | Saurabh Bansal | Saurabh Bansal, Rodolfo M. Capdevilla, Christopher Kolda | On the Minimal Flavor Violating Leptoquark Explanation of the
$R_{D^{(*)}}$ Anomaly | 14 pages, 4 figures | Phys. Rev. D 99, 035047 (2019) | 10.1103/PhysRevD.99.035047 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There has been persistent disagreement between the Standard Model (SM)
prediction and experimental measurements of $R_{D^{(*)}}=\mathcal{B}(\bar B
\rightarrow D^{(*)} \tau \bar\nu_\tau)/\mathcal{B}(\bar B \rightarrow D^{(*)} l
\bar\nu_l)$ $(l=e,\mu)$. This anomaly may be addressed by introducing
interactions beyond the Standard Model involving new states, such as
leptoquarks. Since the processes involved are quark flavor changing, any new
states would need to couple to at least two different generations of quarks,
requiring a non-trivial flavor structure in the quark sector while avoiding
stringent constraints from flavor-changing neutral current processes. In this
work, we look at scalar leptoquarks as a possible solution for the
$R_{D^{(*)}}$ anomaly under the assumption of $\it{minimal~flavor~violation}$
(MFV). We investigate all possible representations for the leptoquarks under
the SM quark flavor symmetry group, consistent with asymptotic freedom. We
consider constraints on their parameter space from self-consistency of the MFV
scenario, perturbativity, the FCNC decay $b\to s\bar\nu\nu$ and precision
electroweak observables. We find that none of the scalar leptoquarks can
explain the $R_{D^{(*)}}$ anomaly while simultaneously avoiding all constraints
within this scenario. Thus scalar leptoquarks with MFV-generated quark
couplings do not work as a solution to the $R_{D^{(*)}}$ anomaly.
| [
{
"created": "Sat, 27 Oct 2018 03:17:25 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2018 15:15:56 GMT",
"version": "v2"
}
] | 2019-03-06 | [
[
"Bansal",
"Saurabh",
""
],
[
"Capdevilla",
"Rodolfo M.",
""
],
[
"Kolda",
"Christopher",
""
]
] | There has been persistent disagreement between the Standard Model (SM) prediction and experimental measurements of $R_{D^{(*)}}=\mathcal{B}(\bar B \rightarrow D^{(*)} \tau \bar\nu_\tau)/\mathcal{B}(\bar B \rightarrow D^{(*)} l \bar\nu_l)$ $(l=e,\mu)$. This anomaly may be addressed by introducing interactions beyond the Standard Model involving new states, such as leptoquarks. Since the processes involved are quark flavor changing, any new states would need to couple to at least two different generations of quarks, requiring a non-trivial flavor structure in the quark sector while avoiding stringent constraints from flavor-changing neutral current processes. In this work, we look at scalar leptoquarks as a possible solution for the $R_{D^{(*)}}$ anomaly under the assumption of $\it{minimal~flavor~violation}$ (MFV). We investigate all possible representations for the leptoquarks under the SM quark flavor symmetry group, consistent with asymptotic freedom. We consider constraints on their parameter space from self-consistency of the MFV scenario, perturbativity, the FCNC decay $b\to s\bar\nu\nu$ and precision electroweak observables. We find that none of the scalar leptoquarks can explain the $R_{D^{(*)}}$ anomaly while simultaneously avoiding all constraints within this scenario. Thus scalar leptoquarks with MFV-generated quark couplings do not work as a solution to the $R_{D^{(*)}}$ anomaly. |
hep-ph/0412191 | Alexander Pukhov | Alexander Pukhov | CalcHEP 2.3: MSSM, structure functions, event generation, batchs, and
generation of matrix elements for other packages | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | CalcHEP is a package for computation of Feynman diagrams and integration over
multi-particle phase space. The main idea prescribed into CalcHEP is to make
available passing on from Lagrangians to the final distributions effectively
with a high level of automation. This article presents new options of CalcHEP
available in version 2.3. They are a) MSSM model with different SUGRA
scenarios, b) interface with PDFLIB and implementation of new MRST/CTEQ
structure functions, c) realization of approach to structure functions for
models with diagonal CKM, d) generation of events and interface with PYTHIA, e)
calculations in non-interactive (batch) regime, f)generation of code of
different matrix elements for other programs, g) many new interface facilities.
| [
{
"created": "Tue, 14 Dec 2004 17:23:33 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2009 19:22:46 GMT",
"version": "v2"
}
] | 2009-10-21 | [
[
"Pukhov",
"Alexander",
""
]
] | CalcHEP is a package for computation of Feynman diagrams and integration over multi-particle phase space. The main idea prescribed into CalcHEP is to make available passing on from Lagrangians to the final distributions effectively with a high level of automation. This article presents new options of CalcHEP available in version 2.3. They are a) MSSM model with different SUGRA scenarios, b) interface with PDFLIB and implementation of new MRST/CTEQ structure functions, c) realization of approach to structure functions for models with diagonal CKM, d) generation of events and interface with PYTHIA, e) calculations in non-interactive (batch) regime, f)generation of code of different matrix elements for other programs, g) many new interface facilities. |
1608.00420 | Valery Lyubovitskij | Thomas Gutsche, Mikhail A. Ivanov, Jurgen G. Korner, Sergey Kovalenko,
Valery E. Lyubovitskij | Nucleon tensor form factors in a relativistic confined quark model | 7 pages | Phys. Rev. D 94, 114030 (2016) | 10.1103/PhysRevD.94.114030 | MITP/16-082 (Mainz) | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for the isotriplet and isosinglet tensor form factors of
the nucleon in the relativistic confined quark model. The model allows us to
calculate not only their normalizations at $Q^2=0$ and the related tensor
charges, but also the full $Q^2$-dependence. Our results are compared to
existing data and predictions of other theoretical approaches. We stress the
importance of these form factors for the phenomenology of physics beyond the
Standard Model.
| [
{
"created": "Mon, 1 Aug 2016 13:30:47 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Dec 2016 00:19:01 GMT",
"version": "v2"
}
] | 2016-12-30 | [
[
"Gutsche",
"Thomas",
""
],
[
"Ivanov",
"Mikhail A.",
""
],
[
"Korner",
"Jurgen G.",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] | We present results for the isotriplet and isosinglet tensor form factors of the nucleon in the relativistic confined quark model. The model allows us to calculate not only their normalizations at $Q^2=0$ and the related tensor charges, but also the full $Q^2$-dependence. Our results are compared to existing data and predictions of other theoretical approaches. We stress the importance of these form factors for the phenomenology of physics beyond the Standard Model. |
hep-ph/9706383 | Ruben A. Alanakyan | R.A. Alanakyan | Triplet Higgs Bosons Production in e^-e^- -Collisions | pages,LaTeX file,using eps.sty,3 ps figures included | Phys.Lett. B436 (1998) 139-144 | 10.1016/S0370-2693(98)00836-3 | Preprint YerPhI-1477(14)-96 | hep-ph | null | In the framework of models with Higgs triplets, doubly and singly charged
triplet Higgs boson production in the processes $e^-e^-\to\delta
^{--}_{L,R}Z^0$ and $e^-e^-\to\delta ^{-}_{L}W^-_L$ are considered.
| [
{
"created": "Tue, 17 Jun 1997 11:13:20 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Feb 1999 08:35:57 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Alanakyan",
"R. A.",
""
]
] | In the framework of models with Higgs triplets, doubly and singly charged triplet Higgs boson production in the processes $e^-e^-\to\delta ^{--}_{L,R}Z^0$ and $e^-e^-\to\delta ^{-}_{L}W^-_L$ are considered. |
1411.4638 | Oleksii Matsedonskyi | Oleksii Matsedonskyi | On Flavour and Naturalness of Composite Higgs Models | Improvement of the discussion on $\Delta F=2$ operators | null | 10.1007/JHEP02(2015)154 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the interplay of the constraints imposed on flavour-symmetric
Composite Higgs models by Naturalness considerations and the constraints
derived from Flavour Physics and Electroweak Precision Tests. Our analysis is
based on the Effective Field Theory which describes the Higgs as a
pseudo-Nambu-Goldstone boson and also includes the composite fermionic
resonances. Within this approach one is able to identify the directions in the
parameter space where the $U(3)$-symmetric flavour models can pass the current
experimental constraints, without conflicting with the light Higgs mass. We
also derive the general features of the $U(2)$-symmetric models required by the
experimental bounds, in case of elementary and totally composite $t_R$. An
effect in the $Z \bar b b$ coupling, which can potentially allow for sizable
deviations in $Z \to \bar b b$ decay parameters without modifying flavour
physics observables, is identified. We also present an analysis of the mixed
scenario, where the top quark mass is generated due to Partial Compositeness
while the light quark masses are Technicolor-like.
| [
{
"created": "Mon, 17 Nov 2014 20:47:15 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 2014 20:19:44 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Matsedonskyi",
"Oleksii",
""
]
] | We analyse the interplay of the constraints imposed on flavour-symmetric Composite Higgs models by Naturalness considerations and the constraints derived from Flavour Physics and Electroweak Precision Tests. Our analysis is based on the Effective Field Theory which describes the Higgs as a pseudo-Nambu-Goldstone boson and also includes the composite fermionic resonances. Within this approach one is able to identify the directions in the parameter space where the $U(3)$-symmetric flavour models can pass the current experimental constraints, without conflicting with the light Higgs mass. We also derive the general features of the $U(2)$-symmetric models required by the experimental bounds, in case of elementary and totally composite $t_R$. An effect in the $Z \bar b b$ coupling, which can potentially allow for sizable deviations in $Z \to \bar b b$ decay parameters without modifying flavour physics observables, is identified. We also present an analysis of the mixed scenario, where the top quark mass is generated due to Partial Compositeness while the light quark masses are Technicolor-like. |
2101.06389 | Etido Inyang | E. P. Inyang, E. P. Inyang, J.E.Ntibi, E. E. Ibekwe, and E. S. William | Analytical study on the Applicability of Ultra Generalized Exponential
Hyperbolic Potential to Predict the Mass Spectra of the Heavy Mesons | 2643 words,16 pages,4 figures and 2 tables. arXiv admin note: text
overlap with arXiv:2101.00333, arXiv:2012.10639, arXiv:2101.01175 | null | null | null | hep-ph math-ph math.MP quant-ph | http://creativecommons.org/licenses/by/4.0/ | We solved the Klein-Gordon equation analytically using the Nikiforov-Uvarov
method to obtain the energy eigenvalues and corresponding wavefunction in terms
of Laguerre polynomials with the ultra generalized exponential hyperbolic
potential. The present results are applied for calculating the mass spectra of
heavy mesons such as charmonium (cc) and bottomonium (cc) for different quantum
states. The present potential provides excellent results in comparison with
experimental data with a maximum error of and work of other researchers.
| [
{
"created": "Sat, 16 Jan 2021 07:22:13 GMT",
"version": "v1"
}
] | 2021-01-19 | [
[
"Inyang",
"E. P.",
""
],
[
"Inyang",
"E. P.",
""
],
[
"Ntibi",
"J. E.",
""
],
[
"Ibekwe",
"E. E.",
""
],
[
"William",
"E. S.",
""
]
] | We solved the Klein-Gordon equation analytically using the Nikiforov-Uvarov method to obtain the energy eigenvalues and corresponding wavefunction in terms of Laguerre polynomials with the ultra generalized exponential hyperbolic potential. The present results are applied for calculating the mass spectra of heavy mesons such as charmonium (cc) and bottomonium (cc) for different quantum states. The present potential provides excellent results in comparison with experimental data with a maximum error of and work of other researchers. |
hep-ph/0312089 | Uzhinsky Vladimir Dr. Sc. | V.Uzhinsky | Simplest Validation of the HIJING Monte Carlo Model | 8 pages, 6 figures | null | null | null | hep-ph | null | Fulfillment of the energy-momentum conservation law, as well as the charge,
baryon and lepton number conservation is checked for the HIJING Monte Carlo
program in $pp$-interactions at $\sqrt{s}=$ 200, 5500, and 14000 GeV. It is
shown that the energy is conserved quite well. The transverse momentum is not
conserved, the deviation from zero is at the level of 1--2 GeV/c, and it is
connected with the hard jet production. The deviation is absent for soft
interactions.
Charge, baryon and lepton numbers are conserved.
Azimuthal symmetry of the Monte Carlo events is studied, too. It is shown
that there is a small signature of a "flow". The situation with the symmetry
gets worse for nucleus-nucleus interactions.
| [
{
"created": "Fri, 5 Dec 2003 18:47:55 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 2003 09:24:39 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Uzhinsky",
"V.",
""
]
] | Fulfillment of the energy-momentum conservation law, as well as the charge, baryon and lepton number conservation is checked for the HIJING Monte Carlo program in $pp$-interactions at $\sqrt{s}=$ 200, 5500, and 14000 GeV. It is shown that the energy is conserved quite well. The transverse momentum is not conserved, the deviation from zero is at the level of 1--2 GeV/c, and it is connected with the hard jet production. The deviation is absent for soft interactions. Charge, baryon and lepton numbers are conserved. Azimuthal symmetry of the Monte Carlo events is studied, too. It is shown that there is a small signature of a "flow". The situation with the symmetry gets worse for nucleus-nucleus interactions. |
hep-ph/0412202 | Bruce H. J. McKellar | Timothy Carruthers and Bruce H J McKellar | Implications of B meson decay data -- a graphical approach | 7 pages, 2 figures; new reference added | null | null | null | hep-ph | null | The considerable influx of new data on B decays offers opportunities to
determine some of the smaller contributions to the decay process, such as
suppressed diagrams, and to test the relations between decay amplitudes implied
by (broken) SU(3) symmetry. The graphical decomposition of decay amplitudes,
corrected here for the contribution of electroweak penguins following Gronau,
Rosner et al, implies bounds not only on the size of diagram contributions but
also on the relevant complex phases due to Cabbibo-Kobayashi-Maskawa matrix
factors. The available data on B decays to two charmless pseudoscalar mesons
are analysed to study some of these decay amplitude relations, and allowed
values of $\gamma=Arg(V_{ub}^*)$ which are consistent with the current favoured
values is obtained. Our analysis is based on a graphical approach, which offers
some insight that is difficult to obtain from $\chi^2$ minimisation, and our
results are consistent with recent observations on the difficulty of obtaining
simultaneous fits to $K\pi$ and $\pi\pi$ decay channels. We have also analyzed
the $K\eta$ and $K\eta'$ channels, and find similar difficulties.
| [
{
"created": "Tue, 14 Dec 2004 23:06:45 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Dec 2004 06:03:24 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Carruthers",
"Timothy",
""
],
[
"McKellar",
"Bruce H J",
""
]
] | The considerable influx of new data on B decays offers opportunities to determine some of the smaller contributions to the decay process, such as suppressed diagrams, and to test the relations between decay amplitudes implied by (broken) SU(3) symmetry. The graphical decomposition of decay amplitudes, corrected here for the contribution of electroweak penguins following Gronau, Rosner et al, implies bounds not only on the size of diagram contributions but also on the relevant complex phases due to Cabbibo-Kobayashi-Maskawa matrix factors. The available data on B decays to two charmless pseudoscalar mesons are analysed to study some of these decay amplitude relations, and allowed values of $\gamma=Arg(V_{ub}^*)$ which are consistent with the current favoured values is obtained. Our analysis is based on a graphical approach, which offers some insight that is difficult to obtain from $\chi^2$ minimisation, and our results are consistent with recent observations on the difficulty of obtaining simultaneous fits to $K\pi$ and $\pi\pi$ decay channels. We have also analyzed the $K\eta$ and $K\eta'$ channels, and find similar difficulties. |
hep-ph/9304244 | null | G.L. Kane | Is the World Supersymmetric? Do We Already Know? | 12, UM-TH-93-10 | null | null | null | hep-ph | null | In addition to the very good theoretical motivations for supersymmetry, there
are now at least nine phenomenological indications that nature is
supersymmetric. All are indirect, so more is better. They are enumerated here.
Some discussion is also given of models, of when and where superpartners might
be directly detected, and of why the scale of supersymmetry cannot be pushed up
if superpartners and SUSY Higgs bosons are not directly detected.
| [
{
"created": "Mon, 12 Apr 1993 15:44:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kane",
"G. L.",
""
]
] | In addition to the very good theoretical motivations for supersymmetry, there are now at least nine phenomenological indications that nature is supersymmetric. All are indirect, so more is better. They are enumerated here. Some discussion is also given of models, of when and where superpartners might be directly detected, and of why the scale of supersymmetry cannot be pushed up if superpartners and SUSY Higgs bosons are not directly detected. |
1912.05581 | Bibhushan Shakya | Hiren H. Patel, Stefano Profumo, Bibhushan Shakya | Loop Dominated Signals from Neutrino Portal Dark Matter | 7 pages, 2 figures | Phys. Rev. D 101, 095001 (2020) | 10.1103/PhysRevD.101.095001 | CERN-TH-2019-203 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scenarios where loop processes give the dominant contributions to
dark matter decay or annihilation despite the presence of tree level channels.
We illustrate this possibility in a specific model where dark matter is part of
a hidden sector that communicates with the Standard Model sector via a heavy
neutrino portal. We explain the underpinning rationale for how loop processes
mediated by the portal neutrinos can parametrically dominate over tree level
decay channels, and demonstrate that this qualitatively changes the indirect
detection signals in positrons, neutrinos, and gamma rays.
| [
{
"created": "Wed, 11 Dec 2019 19:13:16 GMT",
"version": "v1"
}
] | 2020-05-06 | [
[
"Patel",
"Hiren H.",
""
],
[
"Profumo",
"Stefano",
""
],
[
"Shakya",
"Bibhushan",
""
]
] | We study scenarios where loop processes give the dominant contributions to dark matter decay or annihilation despite the presence of tree level channels. We illustrate this possibility in a specific model where dark matter is part of a hidden sector that communicates with the Standard Model sector via a heavy neutrino portal. We explain the underpinning rationale for how loop processes mediated by the portal neutrinos can parametrically dominate over tree level decay channels, and demonstrate that this qualitatively changes the indirect detection signals in positrons, neutrinos, and gamma rays. |
2101.12441 | Jun He Prof. | Jun-Tao Zhu, Lin-Qing Song, Jun He | $P_{cs}(4459)$ and other possible molecular states from
$\Xi_{c}^{(*)}\bar{D}^{(*)}$ and $\Xi'_c\bar{D}^{(*)}$ interactions | 7 pages, 2 figures | Phys. Rev. D 103, 074007 (2021) | 10.1103/PhysRevD.103.074007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the LHCb Collaboration reported a new structure $P_{cs}(4459)$ with
a mass of 19 MeV below the $\Xi_c \bar{D}^{*} $ threshold. It may be a
candidate of molecular state from the $\Xi_c \bar{D}^{*} $ interaction. In the
current work, we perform a coupled-channel study of the $\Xi_c^*\bar{D}^*$,
$\Xi'_c\bar{D}^*$, $\Xi^*_c\bar{D}$, $\Xi_c\bar{D}^*$, $\Xi'_c\bar{D}$, and
$\Xi_c\bar{D}$ interactions in the quasipotential Bethe-Salpeter equation
approach. With the help of the heavy quark chiral effective Lagrangian, the
potential is constructed by light meson exchanges. Two $\Xi_c \bar{D}^{*} $
molecular states are produced with spin parities $ J^P=1/2^-$ and $3/2^- $. The
lower state with $3/2^-$ can be related to the observed $P_{cs}(4450)$ while
two-peak structure cannot be excluded. Within the same model, other strange
hidden-charm pentaquarks are also predicted. Two states with spin parities
$1/2^-$ and $3/2^-$ are predicted near the $\Xi'_c\bar{D}$, $\Xi_c\bar{D}$, and
$\Xi_c^*\bar{D}$ thresholds, respectively. As two states near $\Xi_c
\bar{D}^{*}$ threshold, two states are produced with $1/2^-$ and $3/2^-$ near
the $\Xi'_c\bar{D}^*$ threshold. The couplings of the molecular states to the
considered channels are also discussed. The experimental research of those
states are helpful to understand the origin and internal structure of the
$P_{cs}$ and $P_c$ states.
| [
{
"created": "Fri, 29 Jan 2021 07:24:56 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2021 05:54:51 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Oct 2021 02:16:51 GMT",
"version": "v3"
}
] | 2021-10-27 | [
[
"Zhu",
"Jun-Tao",
""
],
[
"Song",
"Lin-Qing",
""
],
[
"He",
"Jun",
""
]
] | Recently, the LHCb Collaboration reported a new structure $P_{cs}(4459)$ with a mass of 19 MeV below the $\Xi_c \bar{D}^{*} $ threshold. It may be a candidate of molecular state from the $\Xi_c \bar{D}^{*} $ interaction. In the current work, we perform a coupled-channel study of the $\Xi_c^*\bar{D}^*$, $\Xi'_c\bar{D}^*$, $\Xi^*_c\bar{D}$, $\Xi_c\bar{D}^*$, $\Xi'_c\bar{D}$, and $\Xi_c\bar{D}$ interactions in the quasipotential Bethe-Salpeter equation approach. With the help of the heavy quark chiral effective Lagrangian, the potential is constructed by light meson exchanges. Two $\Xi_c \bar{D}^{*} $ molecular states are produced with spin parities $ J^P=1/2^-$ and $3/2^- $. The lower state with $3/2^-$ can be related to the observed $P_{cs}(4450)$ while two-peak structure cannot be excluded. Within the same model, other strange hidden-charm pentaquarks are also predicted. Two states with spin parities $1/2^-$ and $3/2^-$ are predicted near the $\Xi'_c\bar{D}$, $\Xi_c\bar{D}$, and $\Xi_c^*\bar{D}$ thresholds, respectively. As two states near $\Xi_c \bar{D}^{*}$ threshold, two states are produced with $1/2^-$ and $3/2^-$ near the $\Xi'_c\bar{D}^*$ threshold. The couplings of the molecular states to the considered channels are also discussed. The experimental research of those states are helpful to understand the origin and internal structure of the $P_{cs}$ and $P_c$ states. |
2312.12500 | Ariel Zhitnitsky | Ariel Zhitnitsky | Neutron Stars as the Dark Matter detectors | matches the published version | Phys. Rev. D 109, 063018 (2024) | 10.1103/PhysRevD.109.063018 | null | hep-ph astro-ph.HE astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | It has been known for quite sometime that the Neutron Stars (NS) can play a
role of the Dark Matter (DM) detectors due to many uniques features of NS. We
apply these (previously developed) ideas to a specific form of the DM when it
is represented by a composite object, rather than by a local fundamental field
(such as WIMPs). To be more precise we consider the so-called axion quark
nuggets (AQN) dark matter model, when the ``non-baryonic" dark matter in fact
is made of quarks and gluons which are in dense quark phase (similar to the old
idea of the Witten's strangelets). We argue that the interaction of the AQNs
with NS material may lead to many profound observable effects, which
dramatically different from conventional picture when DM particles are
represented by weakly interacting WIMPs. In particular, we argue that the AQNs
may serve as the triggers for the magnetic reconnection to heat the NS surface.
This effect may strongly alleviate (or even completely remove) the observed
inconsistencies between the predicted and observed surface temperatures for
many old NS. This heating mechanism is always accompanied by the hard X ray
emission, which may serve as an indicator of the proposed mechanism.
| [
{
"created": "Tue, 19 Dec 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Mar 2024 05:07:57 GMT",
"version": "v2"
}
] | 2024-03-18 | [
[
"Zhitnitsky",
"Ariel",
""
]
] | It has been known for quite sometime that the Neutron Stars (NS) can play a role of the Dark Matter (DM) detectors due to many uniques features of NS. We apply these (previously developed) ideas to a specific form of the DM when it is represented by a composite object, rather than by a local fundamental field (such as WIMPs). To be more precise we consider the so-called axion quark nuggets (AQN) dark matter model, when the ``non-baryonic" dark matter in fact is made of quarks and gluons which are in dense quark phase (similar to the old idea of the Witten's strangelets). We argue that the interaction of the AQNs with NS material may lead to many profound observable effects, which dramatically different from conventional picture when DM particles are represented by weakly interacting WIMPs. In particular, we argue that the AQNs may serve as the triggers for the magnetic reconnection to heat the NS surface. This effect may strongly alleviate (or even completely remove) the observed inconsistencies between the predicted and observed surface temperatures for many old NS. This heating mechanism is always accompanied by the hard X ray emission, which may serve as an indicator of the proposed mechanism. |
1308.2602 | Brett D. Altschul | Brett Altschul | Contributions to Pion Decay from Lorentz Violation in the Weak Sector | 16 pages | Phys. Rev. D 88, 076015 (2013) | 10.1103/PhysRevD.88.076015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lorentz violation in the weak sector would affect the beta-decay lifetimes of
pions. The decay amplitude may be rendered anisotropic, but only an isotropic
violation of boost invariance can affect the net lifetime in the center of mass
frame. However, since the rest frames of the pions that produce the NuMI
neutrino beam at Fermilab vary with the rotation of the Earth, it is possible
to constrain anisotropic Lorentz violation using prior analyses of sidereal
variations in the event rate at the MINOS near detector. The resulting bounds
on weak-sector Lorentz violation are at the 10^(-4) level, a substantial
improvement over previous results. The highly relativistic character of the
pions involved is responsible for the improvement.
| [
{
"created": "Mon, 12 Aug 2013 15:52:40 GMT",
"version": "v1"
}
] | 2013-11-13 | [
[
"Altschul",
"Brett",
""
]
] | Lorentz violation in the weak sector would affect the beta-decay lifetimes of pions. The decay amplitude may be rendered anisotropic, but only an isotropic violation of boost invariance can affect the net lifetime in the center of mass frame. However, since the rest frames of the pions that produce the NuMI neutrino beam at Fermilab vary with the rotation of the Earth, it is possible to constrain anisotropic Lorentz violation using prior analyses of sidereal variations in the event rate at the MINOS near detector. The resulting bounds on weak-sector Lorentz violation are at the 10^(-4) level, a substantial improvement over previous results. The highly relativistic character of the pions involved is responsible for the improvement. |
hep-ph/9609207 | Naoki Nishiyama | Yuji Koike and N. Nishiyama | $Q^2$ evolution of chiral-odd twist-3 distribution $e(x,Q^2)$ | 16 pages LaTeX, 4 postscript figures | Phys.Rev. D55 (1997) 3068-3076 | 10.1103/PhysRevD.55.3068 | null | hep-ph | null | We study the $Q^2$ dependence of the chiral-odd twist-3 distribution
$e(x,Q^2)$.The anomalous dimension matrix for the corresponding twist-3
operators is calculated in the one-loop level. This study completes the
calculation of the anomalous dimension matrices for all the twist-3
distributions together with the known results for the other twist-3
distributions $g_2(x,Q^2)$ and $h_L(x,Q^2)$. We also have confirmed that in the
large $N_c$ limit the $Q^2$-evolution of $e(x,Q^2)$ is wholely governed by the
lowest eigenvalue of the anomalous dimension matrix which takes a very simple
analytic form as in the case of $g_2$ and $h_L$.
| [
{
"created": "Fri, 30 Aug 1996 13:49:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Koike",
"Yuji",
""
],
[
"Nishiyama",
"N.",
""
]
] | We study the $Q^2$ dependence of the chiral-odd twist-3 distribution $e(x,Q^2)$.The anomalous dimension matrix for the corresponding twist-3 operators is calculated in the one-loop level. This study completes the calculation of the anomalous dimension matrices for all the twist-3 distributions together with the known results for the other twist-3 distributions $g_2(x,Q^2)$ and $h_L(x,Q^2)$. We also have confirmed that in the large $N_c$ limit the $Q^2$-evolution of $e(x,Q^2)$ is wholely governed by the lowest eigenvalue of the anomalous dimension matrix which takes a very simple analytic form as in the case of $g_2$ and $h_L$. |
1002.1872 | Matti Heikinheimo | Oleg Antipin, Matti Heikinheimo, Kimmo Tuominen | The Next Generation | 17 pages, 4 figures, 1 table | JHEP 1007:052,2010 | 10.1007/JHEP07(2010)052 | CP3-Origins-2010-04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility of non-sequential generation(s) of Standard Model
-like matter as a consequence of cancellation of global and gauge anomalies due
to a new strongly interacting sector responsible for the electroweak symmetry
breaking. We consider concrete models for the strong dynamics and outline
several scenarios for the next generation. For these we provide analysis of the
precision constraints as well as a discussion on collider signatures and
implications for cosmology.
| [
{
"created": "Tue, 9 Feb 2010 15:33:04 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Antipin",
"Oleg",
""
],
[
"Heikinheimo",
"Matti",
""
],
[
"Tuominen",
"Kimmo",
""
]
] | We consider the possibility of non-sequential generation(s) of Standard Model -like matter as a consequence of cancellation of global and gauge anomalies due to a new strongly interacting sector responsible for the electroweak symmetry breaking. We consider concrete models for the strong dynamics and outline several scenarios for the next generation. For these we provide analysis of the precision constraints as well as a discussion on collider signatures and implications for cosmology. |
hep-ph/0602067 | Xiaoyan Lin | Xiaoyan Lin | Non-Photonic Electron $p_{T}$ Distributions and Correlations of
Electrons from $B$ and $D$ Meson Decays with Charged Hadrons | revised version with modified title, refined figures and more
references added | null | null | null | hep-ph | null | We compare the non-photonic electron and $D^{0}$ meson $p_{T}$ distributions
measured at RHIC with the PYTHIA Monte Carlo event generator in p+p collisions
at $\sqrt{s_{NN}}=200$ GeV. A delta fragmentation function much harder than the
Peterson function, consistent with recombination scheme for charm meson
formation, is needed to match the experimental data. Attempts to fit the
non-photonic electrons at high $p_{T}$ show large uncertainties and the $B$
meson semi-leptonic decays may not be dominant for electron $p_{T}$ up to 8
GeV/c. Correlations of non-photonic electrons with charged hadrons are studied.
We propose an experimental method to quantitatively determine the relative
contributions of $D$ and $B$ meson semi-leptonic decays to the non-photonic
electrons.
| [
{
"created": "Wed, 8 Feb 2006 07:21:04 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Feb 2006 20:35:36 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Oct 2006 08:09:38 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Lin",
"Xiaoyan",
""
]
] | We compare the non-photonic electron and $D^{0}$ meson $p_{T}$ distributions measured at RHIC with the PYTHIA Monte Carlo event generator in p+p collisions at $\sqrt{s_{NN}}=200$ GeV. A delta fragmentation function much harder than the Peterson function, consistent with recombination scheme for charm meson formation, is needed to match the experimental data. Attempts to fit the non-photonic electrons at high $p_{T}$ show large uncertainties and the $B$ meson semi-leptonic decays may not be dominant for electron $p_{T}$ up to 8 GeV/c. Correlations of non-photonic electrons with charged hadrons are studied. We propose an experimental method to quantitatively determine the relative contributions of $D$ and $B$ meson semi-leptonic decays to the non-photonic electrons. |
0807.0316 | Alex Pomarol | Alex Pomarol and Andrea Wulzer | Baryon Physics in Holographic QCD | 18 pages, version to appear in Nucl. Phys. B | Nucl.Phys.B809:347-361,2009 | 10.1016/j.nuclphysb.2008.10.004 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a simple holographic model for QCD in which the Chern-Simons term is
incorporated to take into account the QCD chiral anomaly, we show that baryons
arise as stable solitons which are the 5D analogs of 4D skyrmions. Contrary to
4D skyrmions and previously considered holographic scenarios, these solitons
have sizes larger than the inverse cut-off of the model, and therefore they are
predictable within our effective field theory approach. We perform a numerical
determination of several static properties of the nucleons and find a
satisfactory agreement with data. We also calculate the amplitudes of
``anomalous'' processes induced by the Chern-Simons term in the meson sector,
such as omega -> pi gamma and omega -> 3pi. A combined fit to baryonic and
mesonic observables leads to an agreement with experiments within 16%.
| [
{
"created": "Wed, 2 Jul 2008 10:21:49 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Nov 2008 18:48:21 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Pomarol",
"Alex",
""
],
[
"Wulzer",
"Andrea",
""
]
] | In a simple holographic model for QCD in which the Chern-Simons term is incorporated to take into account the QCD chiral anomaly, we show that baryons arise as stable solitons which are the 5D analogs of 4D skyrmions. Contrary to 4D skyrmions and previously considered holographic scenarios, these solitons have sizes larger than the inverse cut-off of the model, and therefore they are predictable within our effective field theory approach. We perform a numerical determination of several static properties of the nucleons and find a satisfactory agreement with data. We also calculate the amplitudes of ``anomalous'' processes induced by the Chern-Simons term in the meson sector, such as omega -> pi gamma and omega -> 3pi. A combined fit to baryonic and mesonic observables leads to an agreement with experiments within 16%. |
1003.5090 | Jonathan Rosner | Michael Gronau, Dan Pirjol, and Jonathan L. Rosner | Calculating Phases Between B => K* pi Amplitudes | 12 pages, 6 figures; slight revisions and clarifications | Phys.Rev.D81:094026,2010 | 10.1103/PhysRevD.81.094026 | TECHNION-PH-2010-3, EFI 10-6 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A phase $\Delta \Phi$ between amplitudes for $B^0 \to K^{*0} \pi^0$ and $B^0
\to K^{*+} \pi^-$ plays a crucial role in a method for constraining
Cabibbo-Kobayashi-Maskawa (CKM) parameters. We present a general argument for
destructive interference between amplitudes for $B^0 \to K^{*+} \pi^-$ and $B^0
\to K^{*0} \pi^0$ forming together a smaller $I(K^* \pi) = 3/2$ amplitude.
Applying flavor SU(3) and allowing for conservative theoretical uncertainties,
we obtain lower limits on $|\Delta \Phi|$ and its charge-conjugate. Values of
these two phases favored by the BaBar Collaboration are in good agreement with
our bounds.
| [
{
"created": "Fri, 26 Mar 2010 09:06:37 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Apr 2010 18:37:09 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Gronau",
"Michael",
""
],
[
"Pirjol",
"Dan",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | A phase $\Delta \Phi$ between amplitudes for $B^0 \to K^{*0} \pi^0$ and $B^0 \to K^{*+} \pi^-$ plays a crucial role in a method for constraining Cabibbo-Kobayashi-Maskawa (CKM) parameters. We present a general argument for destructive interference between amplitudes for $B^0 \to K^{*+} \pi^-$ and $B^0 \to K^{*0} \pi^0$ forming together a smaller $I(K^* \pi) = 3/2$ amplitude. Applying flavor SU(3) and allowing for conservative theoretical uncertainties, we obtain lower limits on $|\Delta \Phi|$ and its charge-conjugate. Values of these two phases favored by the BaBar Collaboration are in good agreement with our bounds. |
1107.4767 | Shinsuke Kawai | Masato Arai, Shinsuke Kawai, Nobuchika Okada | Higgs inflation in minimal supersymmetric SU(5) GUT | 5 pages, 4 figures, essentially the published version | null | 10.1103/PhysRevD.84.123515 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model Higgs boson with large nonminimal coupling to the
gravitational curvature can drive cosmological inflation. We study this type of
inflationary scenario in the context of supersymmetric grand unification and
point out that it is naturally implemented in the {\em minimal} supersymmetric
SU(5) model, and hence virtually in any GUT models. It is shown that with an
appropriate K\"{a}hler potential the inflaton trajectory settles down to the
Standard Model vacuum at the end of the slow roll. The predicted cosmological
parameters are also consistent with the 7-year WMAP data.
| [
{
"created": "Sun, 24 Jul 2011 16:07:15 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Aug 2011 01:07:13 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Dec 2011 13:44:13 GMT",
"version": "v3"
}
] | 2013-05-29 | [
[
"Arai",
"Masato",
""
],
[
"Kawai",
"Shinsuke",
""
],
[
"Okada",
"Nobuchika",
""
]
] | The Standard Model Higgs boson with large nonminimal coupling to the gravitational curvature can drive cosmological inflation. We study this type of inflationary scenario in the context of supersymmetric grand unification and point out that it is naturally implemented in the {\em minimal} supersymmetric SU(5) model, and hence virtually in any GUT models. It is shown that with an appropriate K\"{a}hler potential the inflaton trajectory settles down to the Standard Model vacuum at the end of the slow roll. The predicted cosmological parameters are also consistent with the 7-year WMAP data. |
1910.01132 | Yongchao Zhang | Andr\'e de Gouv\^ea, P. S. Bhupal Dev, Bhaskar Dutta, Tathagata Ghosh,
Tao Han, Yongchao Zhang | Leptonic Scalars at the LHC | 36 pages, 10 figures, 4 tables, some analysis and limits are updated
or added, some UV-complete models are provided in the appendix, more
references, version to appear in JHEP | null | 10.1007/JHEP07(2020)142 | PITT-PACC 1909, MI-TH-1936 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the collider prospects of neutrino non-standard interaction with a
Standard Model (SM) gauge-singlet leptonic scalar $\phi$ carrying two units of
lepton-number-charge. These leptonic scalars are forbidden from interacting
with the SM fermions at the renormalizable level and, if one allows for
higher-dimensional operators, couple predominantly to SM neutrinos. For masses
at or below the electroweak scale, $\phi$ decays exclusively into neutrinos.
Its characteristic production signature at hadron collider experiments like the
LHC would be via the vector boson fusion process and leads to same-sign
dileptons, two forward jets in opposite hemispheres, and missing transverse
energy, i.e., $pp \to \ell_\alpha^\pm \ell_\beta^\pm jj + E_T^{\rm miss}$
($\alpha,\, \beta = e,\, \mu, \tau$). Exploiting the final states of electrons
and muons, we estimate, for the first time, the sensitivity of the LHC to these
lepton-number-charged scalars. We show that the LHC sensitivity is largely
complementary to that of low-energy precision measurements of the decays of
charged leptons, charged mesons, $W$, $Z$ and the SM Higgs boson, as well as
the neutrino beam experiments like MINOS, and searches for neutrino
self-interactions at IceCube and in cosmological observations. For $\phi$ mass
larger than roughly 10 GeV, our projected LHC sensitivity would surpass all
existing bounds.
| [
{
"created": "Wed, 2 Oct 2019 18:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jul 2020 04:10:38 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"de Gouvêa",
"André",
""
],
[
"Dev",
"P. S. Bhupal",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Ghosh",
"Tathagata",
""
],
[
"Han",
"Tao",
""
],
[
"Zhang",
"Yongchao",
""
]
] | We explore the collider prospects of neutrino non-standard interaction with a Standard Model (SM) gauge-singlet leptonic scalar $\phi$ carrying two units of lepton-number-charge. These leptonic scalars are forbidden from interacting with the SM fermions at the renormalizable level and, if one allows for higher-dimensional operators, couple predominantly to SM neutrinos. For masses at or below the electroweak scale, $\phi$ decays exclusively into neutrinos. Its characteristic production signature at hadron collider experiments like the LHC would be via the vector boson fusion process and leads to same-sign dileptons, two forward jets in opposite hemispheres, and missing transverse energy, i.e., $pp \to \ell_\alpha^\pm \ell_\beta^\pm jj + E_T^{\rm miss}$ ($\alpha,\, \beta = e,\, \mu, \tau$). Exploiting the final states of electrons and muons, we estimate, for the first time, the sensitivity of the LHC to these lepton-number-charged scalars. We show that the LHC sensitivity is largely complementary to that of low-energy precision measurements of the decays of charged leptons, charged mesons, $W$, $Z$ and the SM Higgs boson, as well as the neutrino beam experiments like MINOS, and searches for neutrino self-interactions at IceCube and in cosmological observations. For $\phi$ mass larger than roughly 10 GeV, our projected LHC sensitivity would surpass all existing bounds. |
1412.5375 | Rudy Marty | Rudy Marty and Elena Bratkovskaya and Wolfgang Cassing and Joerg
Aichelin | Observables in ultrarelativistic heavy-ion collisions from two different
transport approaches for the same initial conditions | Published version (minor changes, one subsection added) | Phys. Rev. C 92, 015201 (2015) | 10.1103/PhysRevC.92.015201 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For nucleus-nucleus collisions at Relativistic-Heavy-Ion Collider (RHIC)
energies we calculate observables in two conceptually transport theories, i.e.
the n-body molecular dynamical model RSP and in the
Parton-Hadron-String-Dynamics (PHSD), starting out from the same distribution
of the initial energy density at the quark gluon plasma (QGP) formation time.
The RSP is based on the Nambu Jona-Lasinio (NJL) Lagrangian whereas in PHSD the
partons are described by the dynamical quasi-particle model (DQPM). Despite of
the very different description of the parton properties, their interactions and
of the hadronization in both approaches the final transverse momentum
distributions of pions and kaons are rather similar. Thus it will be difficult
to conclude from the final experimenal data on the details of the initial
plasma properties.
| [
{
"created": "Wed, 17 Dec 2014 13:14:31 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jul 2015 11:05:04 GMT",
"version": "v2"
}
] | 2015-07-09 | [
[
"Marty",
"Rudy",
""
],
[
"Bratkovskaya",
"Elena",
""
],
[
"Cassing",
"Wolfgang",
""
],
[
"Aichelin",
"Joerg",
""
]
] | For nucleus-nucleus collisions at Relativistic-Heavy-Ion Collider (RHIC) energies we calculate observables in two conceptually transport theories, i.e. the n-body molecular dynamical model RSP and in the Parton-Hadron-String-Dynamics (PHSD), starting out from the same distribution of the initial energy density at the quark gluon plasma (QGP) formation time. The RSP is based on the Nambu Jona-Lasinio (NJL) Lagrangian whereas in PHSD the partons are described by the dynamical quasi-particle model (DQPM). Despite of the very different description of the parton properties, their interactions and of the hadronization in both approaches the final transverse momentum distributions of pions and kaons are rather similar. Thus it will be difficult to conclude from the final experimenal data on the details of the initial plasma properties. |
hep-ph/9805486 | Paul Langacker | Paul Langacker | Z' Physics from Strings | 11 pages. Invited talk presented at PASCOS-98, Northeastern
University, March 1998 | null | null | UPR-0806T | hep-ph hep-th | null | Many extensions of the standard model, especially grand unified theories and
superstring models, predict the existence of additional Z' bosons and
associated exotic chiral supermultiplets. It has recently been argued that for
classes of string motivated models with supergravity mediated supersymmetry
breaking there are two scenarios for the additional Z's: either the mass is in
the accessible range < O(1 TeV), providing a natural solution to the mu problem
and implications for the Higgs and sparticle masses and for the LSP; or, when
the breaking is associated with a D-flat direction, at an intermediate scale,
providing a possible explanation for the hierarchies of quark and charged
lepton masses and new possibilities for neutrino masses. Related work,
examining the detailed structure of specific perturbative string vacua for D
and F-flat directions, surviving U(1)'s and exotics, and effective couplings,
is briefly described.
| [
{
"created": "Wed, 27 May 1998 20:22:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Langacker",
"Paul",
""
]
] | Many extensions of the standard model, especially grand unified theories and superstring models, predict the existence of additional Z' bosons and associated exotic chiral supermultiplets. It has recently been argued that for classes of string motivated models with supergravity mediated supersymmetry breaking there are two scenarios for the additional Z's: either the mass is in the accessible range < O(1 TeV), providing a natural solution to the mu problem and implications for the Higgs and sparticle masses and for the LSP; or, when the breaking is associated with a D-flat direction, at an intermediate scale, providing a possible explanation for the hierarchies of quark and charged lepton masses and new possibilities for neutrino masses. Related work, examining the detailed structure of specific perturbative string vacua for D and F-flat directions, surviving U(1)'s and exotics, and effective couplings, is briefly described. |
hep-ph/0005039 | Le Yaouanc | A. Le Yaouanc, D. Melikhov, V. Morenas, L. Oliver, O. P\`ene, J.-C.
Raynal | Duality in the non-relativistic harmonic oscillator quark model in the
Shifman-Voloshin limit : a pedagogical example | 11 pages, Latex2e, AMS-LaTeX | Phys.Lett. B488 (2000) 153-161 | 10.1016/S0370-2693(00)00863-7 | LPT-Orsay 00-29 HD-THEP-00-14 PCCF RI 00-10 Subject : Particle
Physics | hep-ph | null | The detailed way in which duality between sum of exclusive states and the
free quark model description operates in semileptonic total decay widths, is
analysed. It is made very explicit by the use of the non relativistic harmonic
oscillator quark model in the SV limit, and a simple interaction current with
the lepton pair. In particular, the Voloshin sum rule is found to eliminate the
mismatches of order $\delta m/m_b^2$.
| [
{
"created": "Thu, 4 May 2000 15:31:27 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Yaouanc",
"A. Le",
""
],
[
"Melikhov",
"D.",
""
],
[
"Morenas",
"V.",
""
],
[
"Oliver",
"L.",
""
],
[
"Pène",
"O.",
""
],
[
"Raynal",
"J. -C.",
""
]
] | The detailed way in which duality between sum of exclusive states and the free quark model description operates in semileptonic total decay widths, is analysed. It is made very explicit by the use of the non relativistic harmonic oscillator quark model in the SV limit, and a simple interaction current with the lepton pair. In particular, the Voloshin sum rule is found to eliminate the mismatches of order $\delta m/m_b^2$. |
2210.09313 | Anirban Das | Anirban Das, Noah Kurinsky, Rebecca K. Leane | Dark Matter Induced Power in Quantum Devices | v2: version published in PRL | Phys. Rev. Lett. 132, 121801 (2024) | 10.1103/PhysRevLett.132.121801 | SLAC-PUB-17691 | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | We point out that power measurements of single quasiparticle devices open a
new avenue to detect dark matter (DM). The threshold of these devices is set by
the Cooper pair binding energy, and is therefore so low that they can detect DM
as light as about an MeV incoming from the Galactic halo, as well as the
low-velocity thermalized DM component potentially present in the Earth. Using
existing power measurements with these new devices, as well as power
measurements with SuperCDMS-CPD, we set new constraints on the spin-independent
DM scattering cross section for DM masses from about 10 MeV to 10 GeV. We
outline future directions to improve sensitivity to both halo DM and a
thermalized DM population in the Earth using power deposition in quantum
devices.
| [
{
"created": "Mon, 17 Oct 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Mar 2024 01:42:56 GMT",
"version": "v2"
}
] | 2024-03-26 | [
[
"Das",
"Anirban",
""
],
[
"Kurinsky",
"Noah",
""
],
[
"Leane",
"Rebecca K.",
""
]
] | We point out that power measurements of single quasiparticle devices open a new avenue to detect dark matter (DM). The threshold of these devices is set by the Cooper pair binding energy, and is therefore so low that they can detect DM as light as about an MeV incoming from the Galactic halo, as well as the low-velocity thermalized DM component potentially present in the Earth. Using existing power measurements with these new devices, as well as power measurements with SuperCDMS-CPD, we set new constraints on the spin-independent DM scattering cross section for DM masses from about 10 MeV to 10 GeV. We outline future directions to improve sensitivity to both halo DM and a thermalized DM population in the Earth using power deposition in quantum devices. |
hep-ph/9611425 | Esteban Roulet | L. Covi and E. Roulet | Baryogenesis from mixed particle decays | Latex file, 14 pgs. two figures | Phys.Lett. B399 (1997) 113-118 | 10.1016/S0370-2693(97)00287-6 | null | hep-ph | null | We consider the $CP$ violating asymmetries produced in the decay of heavy
particles, studying the effects of heavy particle mixing for arbitrary mass
splittings. A considerable enhancement of the asymmetries is achieved when the
masses of the mixed states are comparable, and the enhancement is maximal for
mass splittings of the order of the widths of the decaying particles. We apply
the results to the particular case of heavy scalar neutrino decays relevant for
leptogenesis scenarios.
| [
{
"created": "Tue, 26 Nov 1996 11:13:16 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Covi",
"L.",
""
],
[
"Roulet",
"E.",
""
]
] | We consider the $CP$ violating asymmetries produced in the decay of heavy particles, studying the effects of heavy particle mixing for arbitrary mass splittings. A considerable enhancement of the asymmetries is achieved when the masses of the mixed states are comparable, and the enhancement is maximal for mass splittings of the order of the widths of the decaying particles. We apply the results to the particular case of heavy scalar neutrino decays relevant for leptogenesis scenarios. |
hep-ph/9801334 | Qiao Cong Feng | Chong-Sheng Li, Shou-Hua Zhu, and Cong-Feng Qiao | Radiative Higgs Boson Decays H\to f\bar{f}\gamma Beyond the Standard
Model | 13 pages in Revtex, version to appear in Phys. Rev. D | Phys. Rev. D 57, 6928 (1998) | 10.1103/PhysRevD.57.6928 | PUTP-TH-98-01 | hep-ph | null | Neutral Higgs boson radiative decays of the form h_0, H, A \to
f\bar{f}\gamma, in the light fermion limit $m_f->0, are calculated in the two
Higgs doublet model at one-loop level. Comparisons with the calculation within
the standard model are given, which indicates that these two models are
distinguishable in the decay mode fermion-antifermion -photon. Our results show
that the concerned process may stand as an implement to identify the Higgs
belongings in case there is a intermediate mass Higgs detected.
| [
{
"created": "Sun, 18 Jan 1998 04:05:10 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 1998 03:25:49 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Li",
"Chong-Sheng",
""
],
[
"Zhu",
"Shou-Hua",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | Neutral Higgs boson radiative decays of the form h_0, H, A \to f\bar{f}\gamma, in the light fermion limit $m_f->0, are calculated in the two Higgs doublet model at one-loop level. Comparisons with the calculation within the standard model are given, which indicates that these two models are distinguishable in the decay mode fermion-antifermion -photon. Our results show that the concerned process may stand as an implement to identify the Higgs belongings in case there is a intermediate mass Higgs detected. |
2301.07052 | Vsevolod Syvolap | Vsevolod Syvolap | Testing heavy neutral leptons produced in the supernovae explosions with
future neutrino detectors | null | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hypothetical particles called heavy neutral leptons (HNLs) can be produced in
large quantities in the cores of supernovae during the first seconds of the
explosion. These particles then decay, producing secondary energetic neutrinos
that can be detected by neutrino detectors. In this paper, I identify a region
of the HNL parameter space that could be tested using this method, assuming a
supernova explosion at distances from 0.2 to 10 kpc. The range of HNLs masses
$m_N \sim 160-700$ MeV and lifetimes of $\tau_N \gtrsim 0.02$ seconds can be
probed using the Hyper-Kamiokande neutrino detector. This region of the
parameter space is complementary to existing bounds from primordial
nucleosynthesis and to the expected sensitivity of the future SHiP experiment,
thus covering a gap in our current knowledge of HNLs up to masses of $m_N
\simeq 400$ MeV.
| [
{
"created": "Tue, 17 Jan 2023 18:09:37 GMT",
"version": "v1"
}
] | 2023-01-18 | [
[
"Syvolap",
"Vsevolod",
""
]
] | Hypothetical particles called heavy neutral leptons (HNLs) can be produced in large quantities in the cores of supernovae during the first seconds of the explosion. These particles then decay, producing secondary energetic neutrinos that can be detected by neutrino detectors. In this paper, I identify a region of the HNL parameter space that could be tested using this method, assuming a supernova explosion at distances from 0.2 to 10 kpc. The range of HNLs masses $m_N \sim 160-700$ MeV and lifetimes of $\tau_N \gtrsim 0.02$ seconds can be probed using the Hyper-Kamiokande neutrino detector. This region of the parameter space is complementary to existing bounds from primordial nucleosynthesis and to the expected sensitivity of the future SHiP experiment, thus covering a gap in our current knowledge of HNLs up to masses of $m_N \simeq 400$ MeV. |
1105.0450 | Hai-Yang Cheng | Y. H. Ahn, Hai-Yang Cheng, Sechul Oh | Remarks on the Qin-Ma Parametrization of Quark Mixing Matrix | 8 pages, a shortened version accepted by PLB | null | 10.1016/j.physletb.2011.06.052 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Qin and Ma (QM) have advocated a new Wolfenstein-like
parametrization of the quark mixing matrix based on the triminimal expansion of
the Cabibbo-Kobayashi-Maskawa (CKM) parametrization. The CP-odd phase in the QM
parametrization is around $90^\circ$ just as that in the CKM parametrization.
We point out that the QM parametrization can be readily obtained from the
Wolfenstein parametrization after appropriate phase redefinition for quark
fields and that the phase $\delta$ in both QM and CKM parametrizations is
related to the unitarity angles $\alpha$, $\beta$ and $\gamma$, namely,
$\delta= \beta+\gamma$ or $\pi-\alpha$. We show that both QM and Wolfenstein
parametrizations can be deduced from the CKM and Chau-Keung-Maiani ones. By
deriving the QM parametrization from the Fritzsch-Xing (FX) parametrization of
the quark mixing matrix, we find that the phase of the FX form is in the
vicinity of $-270^\circ$ and hence $\sin\delta\approx 1$. We discuss the
seeming discrepancy between the Wolfenstein and QM parametrizations at the high
order of $\lambda\approx |V_{us}|$.
| [
{
"created": "Mon, 2 May 2011 22:50:16 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2011 11:57:16 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Ahn",
"Y. H.",
""
],
[
"Cheng",
"Hai-Yang",
""
],
[
"Oh",
"Sechul",
""
]
] | Recently, Qin and Ma (QM) have advocated a new Wolfenstein-like parametrization of the quark mixing matrix based on the triminimal expansion of the Cabibbo-Kobayashi-Maskawa (CKM) parametrization. The CP-odd phase in the QM parametrization is around $90^\circ$ just as that in the CKM parametrization. We point out that the QM parametrization can be readily obtained from the Wolfenstein parametrization after appropriate phase redefinition for quark fields and that the phase $\delta$ in both QM and CKM parametrizations is related to the unitarity angles $\alpha$, $\beta$ and $\gamma$, namely, $\delta= \beta+\gamma$ or $\pi-\alpha$. We show that both QM and Wolfenstein parametrizations can be deduced from the CKM and Chau-Keung-Maiani ones. By deriving the QM parametrization from the Fritzsch-Xing (FX) parametrization of the quark mixing matrix, we find that the phase of the FX form is in the vicinity of $-270^\circ$ and hence $\sin\delta\approx 1$. We discuss the seeming discrepancy between the Wolfenstein and QM parametrizations at the high order of $\lambda\approx |V_{us}|$. |
hep-ph/0207095 | Dan Pirjol | Dan Pirjol | Probing New Physics with b -> s\gamma Decays | 6 pages, talk given at Flavor Physics and CP Violation (FPCP),
Philadelphia, PA, May 2002 | null | null | UCSD/PTH 02-16 | hep-ph | null | In the Standard Model, the photon emitted in b->s\gamma decays is predicted
to be left-handed polarized. We discuss the types of New Physics which can
produce a deviation from this prediction, focusing on the Minimal
Supersymmetric Standard Model. A new method is proposed for testing these
predictions, which makes use of angular correlations in exclusive B ->
K\pi\pi\gamma decays.
| [
{
"created": "Mon, 8 Jul 2002 18:34:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pirjol",
"Dan",
""
]
] | In the Standard Model, the photon emitted in b->s\gamma decays is predicted to be left-handed polarized. We discuss the types of New Physics which can produce a deviation from this prediction, focusing on the Minimal Supersymmetric Standard Model. A new method is proposed for testing these predictions, which makes use of angular correlations in exclusive B -> K\pi\pi\gamma decays. |
0810.1546 | Ilya F. Ginzburg | I.F. Ginzburg | Necessity of mixed kinetic term in the description of general system
with identical fields | 12 pages, 3 figures | null | 10.1016/j.physletb.2009.10.071 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most general renormalizable interaction in the system with a set of scalar
fields having identical quantum numbers generates naturally mixed kinetic terms
in the Lagrangian. Taking into account these terms leads to modification both
the renormalization group equations and the tree level analysis as compare with
many published results. We obtain conditions for non-appearance of such a
running mixing in some important cases.
| [
{
"created": "Thu, 9 Oct 2008 16:57:21 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Oct 2009 15:25:05 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Ginzburg",
"I. F.",
""
]
] | Most general renormalizable interaction in the system with a set of scalar fields having identical quantum numbers generates naturally mixed kinetic terms in the Lagrangian. Taking into account these terms leads to modification both the renormalization group equations and the tree level analysis as compare with many published results. We obtain conditions for non-appearance of such a running mixing in some important cases. |
2105.06539 | Canan Nurhan Karahan | Durmus Demir, Canan Karahan and Ozan Sarg{\i}n | Type-3/2 Seesaw Mechanism | v3: 5 pages, 4 figs, 1 table; emphasized vector-spinor, no change in
the results and conclusion | Phys. Rev. D 104, 075038 (2021) | 10.1103/PhysRevD.104.075038 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Type-I seesaw provides a natural explanation for the tiny neutrino masses.
The right-handed neutrino masses it requires are, however, too large to keep
the Higgs boson mass at its measured value. Here we show that vector-spinors,
singlet leptons like the right-handed neutrinos, generate the tiny neutrino
masses naturally by the exchange of its spin-1/2 and spin-3/2 components. This
one-step seesaw mechanism, which we call Type-3/2 seesaw, keeps the Higgs boson
mass unchanged at one loop, and gives cause therefore to no fine-tuning
problem. If the on-shell vector-spinor is a pure spin-3/2 particle then it
becomes a potential candidate for hidden dark matter diluting due only to the
expansion of the Universe. The Type-3/2 seesaw provides a natural framework for
the neutrino, Higgs boson and dark matter sectors, with overall agreement with
current experiments and observations.
| [
{
"created": "Thu, 13 May 2021 20:15:19 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 2021 20:03:25 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jul 2021 12:18:31 GMT",
"version": "v3"
}
] | 2021-12-07 | [
[
"Demir",
"Durmus",
""
],
[
"Karahan",
"Canan",
""
],
[
"Sargın",
"Ozan",
""
]
] | Type-I seesaw provides a natural explanation for the tiny neutrino masses. The right-handed neutrino masses it requires are, however, too large to keep the Higgs boson mass at its measured value. Here we show that vector-spinors, singlet leptons like the right-handed neutrinos, generate the tiny neutrino masses naturally by the exchange of its spin-1/2 and spin-3/2 components. This one-step seesaw mechanism, which we call Type-3/2 seesaw, keeps the Higgs boson mass unchanged at one loop, and gives cause therefore to no fine-tuning problem. If the on-shell vector-spinor is a pure spin-3/2 particle then it becomes a potential candidate for hidden dark matter diluting due only to the expansion of the Universe. The Type-3/2 seesaw provides a natural framework for the neutrino, Higgs boson and dark matter sectors, with overall agreement with current experiments and observations. |
hep-ph/0503225 | Dr. Rukmani Mohanta | R. Mohanta | Implications of the non-universal Z boson in FCNC mediated rare decays | 15 pages, 4 figures, minor changes in the text, references added, to
appear in PRD | Phys.Rev. D71 (2005) 114013 | 10.1103/PhysRevD.71.114013 | null | hep-ph | null | We analyze the effect of the non-universal $Z$ boson in the rare decays $B_s
\to l^+ l^- $, $B_s \to l^+ l^- \gamma $ and $Z \to b \bar s$ decays. These
decays involve the FCNC mediated $ b \to s $ transitions, and are found to be
very small in the standard model. The smallness of these decays in the standard
model makes them sensitive probe for new physics. We find an enhancement of at
least an order in these branching ratios because of the non-universal $Zbs$
coupling.
| [
{
"created": "Wed, 23 Mar 2005 04:26:41 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jun 2005 05:05:55 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Mohanta",
"R.",
""
]
] | We analyze the effect of the non-universal $Z$ boson in the rare decays $B_s \to l^+ l^- $, $B_s \to l^+ l^- \gamma $ and $Z \to b \bar s$ decays. These decays involve the FCNC mediated $ b \to s $ transitions, and are found to be very small in the standard model. The smallness of these decays in the standard model makes them sensitive probe for new physics. We find an enhancement of at least an order in these branching ratios because of the non-universal $Zbs$ coupling. |
1307.5865 | Sabine Kraml | F. Boudjema, G. Cacciapaglia, K. Cranmer, G. Dissertori, A. Deandrea,
G. Drieu la Rochelle, B. Dumont, U. Ellwanger, A. Falkowski, J. Galloway, R.
M. Godbole, J. F. Gunion, A. Korytov, S. Kraml, H. B. Prosper, V. Sanz, S.
Sekmen | On the presentation of the LHC Higgs Results | Conclusions from the workshops "Likelihoods for the LHC Searches",
21-23 January 2013 at CERN, "Implications of the 125 GeV Higgs Boson", 18-22
March 2013 at LPSC Grenoble, and from the 2013 Les Houches "Physics at TeV
Colliders" workshop. 16 pages, 3 figures. Version 2: Comment added on the
first publication of signal strength likelihoods in digital form by ATLAS | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We put forth conclusions and suggestions regarding the presentation of the
LHC Higgs results that may help to maximize their impact and their utility to
the whole High Energy Physics community.
| [
{
"created": "Mon, 22 Jul 2013 20:14:18 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Sep 2013 10:35:42 GMT",
"version": "v2"
}
] | 2013-09-17 | [
[
"Boudjema",
"F.",
""
],
[
"Cacciapaglia",
"G.",
""
],
[
"Cranmer",
"K.",
""
],
[
"Dissertori",
"G.",
""
],
[
"Deandrea",
"A.",
""
],
[
"la Rochelle",
"G. Drieu",
""
],
[
"Dumont",
"B.",
""
],
[
"Ellwanger",
"U.",
""
],
[
"Falkowski",
"A.",
""
],
[
"Galloway",
"J.",
""
],
[
"Godbole",
"R. M.",
""
],
[
"Gunion",
"J. F.",
""
],
[
"Korytov",
"A.",
""
],
[
"Kraml",
"S.",
""
],
[
"Prosper",
"H. B.",
""
],
[
"Sanz",
"V.",
""
],
[
"Sekmen",
"S.",
""
]
] | We put forth conclusions and suggestions regarding the presentation of the LHC Higgs results that may help to maximize their impact and their utility to the whole High Energy Physics community. |
2306.06492 | Qin Chang | Lili Chen, Mengfei Zhao, Liting Wang, Yueyang Kang, Qin Chang, Junfeng
Sun | Study of the nonleptonic charmless $B$ ${\to}$ $SS$ decays with the QCD
factorization approach | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Inspired by the brilliant prospects of the ongoing $B$ meson experiments, the
hadronic charmless $B$ ${\to}$ $SS$ decays are studied by considering the
next-to-leading (NLO) contributions with the QCD factorization approach, where
$S$ denotes the scalar mesons $K_{0}^{\ast}(1430)$ and $a_{0}(1450)$. Branching
ratios and $CP$ violating asymmetries are estimated with the updated values of
hadronic parameters obtained from a covariant light-front quark model, for two
scenarios where the scalar mesons are the $1^{3}P_{0}$ and $2^{3}P_{0}$ states.
It is found that the NLO contributions are very important for the $B$ ${\to}$
$SS$ decays; For the $B$ ${\to}$ $a_{0}(1450)K_{0}^{\ast}(1430)$ and $B_{s}$
${\to}$ $K_{0}^{\ast}(1430)\overline{K}_{0}^{\ast}(1430)$ decays, branching
ratios can reach up to the order of ${\cal O}(10^{-5})$ by assuming that the
scalar mesons are the $1P$ states, and should first be investigated in the
future experiments.
| [
{
"created": "Sat, 10 Jun 2023 17:16:29 GMT",
"version": "v1"
}
] | 2023-06-13 | [
[
"Chen",
"Lili",
""
],
[
"Zhao",
"Mengfei",
""
],
[
"Wang",
"Liting",
""
],
[
"Kang",
"Yueyang",
""
],
[
"Chang",
"Qin",
""
],
[
"Sun",
"Junfeng",
""
]
] | Inspired by the brilliant prospects of the ongoing $B$ meson experiments, the hadronic charmless $B$ ${\to}$ $SS$ decays are studied by considering the next-to-leading (NLO) contributions with the QCD factorization approach, where $S$ denotes the scalar mesons $K_{0}^{\ast}(1430)$ and $a_{0}(1450)$. Branching ratios and $CP$ violating asymmetries are estimated with the updated values of hadronic parameters obtained from a covariant light-front quark model, for two scenarios where the scalar mesons are the $1^{3}P_{0}$ and $2^{3}P_{0}$ states. It is found that the NLO contributions are very important for the $B$ ${\to}$ $SS$ decays; For the $B$ ${\to}$ $a_{0}(1450)K_{0}^{\ast}(1430)$ and $B_{s}$ ${\to}$ $K_{0}^{\ast}(1430)\overline{K}_{0}^{\ast}(1430)$ decays, branching ratios can reach up to the order of ${\cal O}(10^{-5})$ by assuming that the scalar mesons are the $1P$ states, and should first be investigated in the future experiments. |
1002.2704 | Damiano Anselmi | Damiano Anselmi, Emilio Ciuffoli | Renormalization Of High-Energy Lorentz Violating Four Fermion Models | 24 pages; v2: typos corrected, more details and some expanded
comments, PRD published version | Phys.Rev.D81:085043,2010 | 10.1103/PhysRevD.81.085043 | IFUP-TH 2009/23 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the one-loop renormalization of high-energy Lorentz violating four
fermion models. We derive general formulas and then consider a number of
specific models. We study the conditions for asymptotic freedom and give a
practical method to determine the asymptotic-freedom domain. We also point out
that in some models the RG flow contains "rational" Zimmermann trajectories
that might hide new symmetries.
| [
{
"created": "Sat, 13 Feb 2010 13:27:02 GMT",
"version": "v1"
},
{
"created": "Sun, 9 May 2010 16:07:05 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Anselmi",
"Damiano",
""
],
[
"Ciuffoli",
"Emilio",
""
]
] | We study the one-loop renormalization of high-energy Lorentz violating four fermion models. We derive general formulas and then consider a number of specific models. We study the conditions for asymptotic freedom and give a practical method to determine the asymptotic-freedom domain. We also point out that in some models the RG flow contains "rational" Zimmermann trajectories that might hide new symmetries. |
2109.07600 | Roman Pasechnik | Roman Pasechnik and Michal \v{S}umbera | Different faces of confinement | 57 pages, 7 figures; an invited review for the Special Issue "Modern
Approaches to Non-Perturbative QCD and other Confining Gauge Theories", in
Universe 7 (2021) no. 9, 330 | Universe 7 (2021) 9, 330 | 10.3390/universe7090330 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review, we provide a short outlook of some of the currently most
popular pictures and promising approaches to non-perturbative physics and
confinement in gauge theories. A qualitative and by no means exhaustive
discussion presented here covers such key topics as the phases of QCD matter,
the order parameters for confinement, the central vortex and monopole pictures
of the QCD vacuum structure, fundamental properties of the string tension,
confinement realisations in gauge-Higgs and Yang-Mills theories, magnetic
order/disorder phase transition among others.
| [
{
"created": "Wed, 15 Sep 2021 22:21:57 GMT",
"version": "v1"
}
] | 2021-09-17 | [
[
"Pasechnik",
"Roman",
""
],
[
"Šumbera",
"Michal",
""
]
] | In this review, we provide a short outlook of some of the currently most popular pictures and promising approaches to non-perturbative physics and confinement in gauge theories. A qualitative and by no means exhaustive discussion presented here covers such key topics as the phases of QCD matter, the order parameters for confinement, the central vortex and monopole pictures of the QCD vacuum structure, fundamental properties of the string tension, confinement realisations in gauge-Higgs and Yang-Mills theories, magnetic order/disorder phase transition among others. |
hep-ph/0003241 | Cvetic Gorazd | G. Cvetic (APCTP, Seoul) and Ji-Young Yu (Dortmund) | Borel-Pade vs Borel-Weniger method: a QED and a QCD example | 11 pages, 9 eps-figures, revtex; one reference added, one sentence
(in 3rd paragraph after Eq.(11)) added for better clarity, references updated | Mod.Phys.Lett. A15 (2000) 1227-1236 | 10.1142/S0217732300001596 | null | hep-ph | null | Recently, Weniger (delta sequence) method has been proposed by the authors of
Ref. [1] (Jentschura et al.) for resummation of truncated perturbation series
in quantum field theories. Those authors presented numerical evidence
suggesting that this method works better than Pade approximants when we resum a
function with singularities in the Borel plane but not on the positive axis. We
present here numerical evidence suggesting that in such cases the combined
method of Borel-Pade works better than its analog Borel-Weniger, and that it
may work better or comparably well in some of the cases when there are
singularities on the positive axis in the Borel plane.
| [
{
"created": "Fri, 24 Mar 2000 08:26:51 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 2000 09:11:17 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Aug 2000 10:36:02 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Cvetic",
"G.",
"",
"APCTP, Seoul"
],
[
"Yu",
"Ji-Young",
"",
"Dortmund"
]
] | Recently, Weniger (delta sequence) method has been proposed by the authors of Ref. [1] (Jentschura et al.) for resummation of truncated perturbation series in quantum field theories. Those authors presented numerical evidence suggesting that this method works better than Pade approximants when we resum a function with singularities in the Borel plane but not on the positive axis. We present here numerical evidence suggesting that in such cases the combined method of Borel-Pade works better than its analog Borel-Weniger, and that it may work better or comparably well in some of the cases when there are singularities on the positive axis in the Borel plane. |
hep-ph/0304081 | Anna Rossi | Andrea Brignole and Anna Rossi (Padova U. & INFN) | Lepton Flavour Violating Decays of Supersymmetric Higgs Bosons | 13 LaTeX pages, 2 postscript figures, uses epsfig and axodraw | Phys.Lett.B566:217-225,2003 | 10.1016/S0370-2693(03)00837-2 | DFPD-03/TH/11 | hep-ph | null | We compute the lepton flavour violating couplings of Higgs bosons in the
Minimal Supersymmetric Standard Model, and show that they can induce the decays
(h,H,A) --> mu tau at non-negligible rates, for large tan(beta) and sizeable
smuon-stau mixing. We also discuss the prospects for detecting such decays at
LHC and other colliders, as well as the correlation with other flavour
violating processes, such as tau --> mu gamma and tau --> 3 mu.
| [
{
"created": "Tue, 8 Apr 2003 18:46:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Brignole",
"Andrea",
"",
"Padova U. & INFN"
],
[
"Rossi",
"Anna",
"",
"Padova U. & INFN"
]
] | We compute the lepton flavour violating couplings of Higgs bosons in the Minimal Supersymmetric Standard Model, and show that they can induce the decays (h,H,A) --> mu tau at non-negligible rates, for large tan(beta) and sizeable smuon-stau mixing. We also discuss the prospects for detecting such decays at LHC and other colliders, as well as the correlation with other flavour violating processes, such as tau --> mu gamma and tau --> 3 mu. |
1408.0692 | Victor A. Nikonov | V.V. Anisovich, V.A. Nikonov, J. Nyiri | Hadron collisions at ultrahigh energies: black disk or resonant disk
modes? | 9 pages | null | 10.1103/PhysRevD.90.074005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analysis of current ultrahigh energy data for hadronic total cross
sections and diffractive scattering cross sections points to a steady growth of
the optical density with energy for elastic scattering amplitudes in the impact
parameter space, $b$. At LHC energy the profile function of the $pp$-scattering
amplitude, $T(b)$, reaches the black disk limit at small $b$. Two scenarios are
possible at larger energies, $\sqrt{s}\ga 100$ TeV. First, the profile function
gets frozen in the black disk limit, $T(b)\simeq 1$ while the radius of the
black disk $R_{black\;disk}$ is increasing with $\sqrt s$, providing
$\sigma_{tot}\sim \ln^2s$, $\sigma_{el}\sim \ln^2s$, $\sigma_{inel}\sim
\ln^2s$. In another scenario the profile function continues to grow at
$\sqrt{s}\ga 100$ TeV approaching the maximal value, $T(b)\simeq 2$, that means
the resonant disk mode. We discuss features of the resonant disk mode when the
disk radius, $R_{resonant\;disk}\,$, increases providing the growth of the
total and elastic cross sections $\sigma_{tot}\sim \ln^2s$, $\sigma_{el}\sim
\ln^2s$, but a more slow increase of inelastic cross section,
$\sigma_{inel}\sim \ln s$.
| [
{
"created": "Mon, 4 Aug 2014 14:19:15 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Aug 2014 07:25:30 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Aug 2014 08:46:38 GMT",
"version": "v3"
}
] | 2015-06-22 | [
[
"Anisovich",
"V. V.",
""
],
[
"Nikonov",
"V. A.",
""
],
[
"Nyiri",
"J.",
""
]
] | The analysis of current ultrahigh energy data for hadronic total cross sections and diffractive scattering cross sections points to a steady growth of the optical density with energy for elastic scattering amplitudes in the impact parameter space, $b$. At LHC energy the profile function of the $pp$-scattering amplitude, $T(b)$, reaches the black disk limit at small $b$. Two scenarios are possible at larger energies, $\sqrt{s}\ga 100$ TeV. First, the profile function gets frozen in the black disk limit, $T(b)\simeq 1$ while the radius of the black disk $R_{black\;disk}$ is increasing with $\sqrt s$, providing $\sigma_{tot}\sim \ln^2s$, $\sigma_{el}\sim \ln^2s$, $\sigma_{inel}\sim \ln^2s$. In another scenario the profile function continues to grow at $\sqrt{s}\ga 100$ TeV approaching the maximal value, $T(b)\simeq 2$, that means the resonant disk mode. We discuss features of the resonant disk mode when the disk radius, $R_{resonant\;disk}\,$, increases providing the growth of the total and elastic cross sections $\sigma_{tot}\sim \ln^2s$, $\sigma_{el}\sim \ln^2s$, but a more slow increase of inelastic cross section, $\sigma_{inel}\sim \ln s$. |
hep-ph/0701085 | J\"urgen Rohrwild | J. Rohrwild | Light-cone sum rules for the $N\gamma\Delta$ transitions for real
photons | 34 pages, 9 figures, revised version, published in Phys. Rev. D, one
misplaced reference corrected | Phys.Rev.D75:074025,2007 | 10.1103/PhysRevD.75.074025 | null | hep-ph | null | We examine the radiative $\Delta \to \gamma N$ transition at the real photon
point $Q^2=0$ using the framework of light-cone QCD sum rules. In particular,
the sum rules for the transition form factors $G_M(0)$ and $R_{EM}$ are
determined up to twist 4. The result for $G_M(0)$ agrees with experiment within
10% accuracy. The agreement for $R_{EM}$ is also reasonable. In addition, we
derive new light-cone sum rules for the magnetic moments of nucleons, with a
complete account of twist-4 corrections based on a recent reanalysis of photon
distribution amplitudes.
| [
{
"created": "Thu, 11 Jan 2007 11:50:29 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jan 2007 14:01:33 GMT",
"version": "v2"
},
{
"created": "Tue, 15 May 2007 07:44:36 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Rohrwild",
"J.",
""
]
] | We examine the radiative $\Delta \to \gamma N$ transition at the real photon point $Q^2=0$ using the framework of light-cone QCD sum rules. In particular, the sum rules for the transition form factors $G_M(0)$ and $R_{EM}$ are determined up to twist 4. The result for $G_M(0)$ agrees with experiment within 10% accuracy. The agreement for $R_{EM}$ is also reasonable. In addition, we derive new light-cone sum rules for the magnetic moments of nucleons, with a complete account of twist-4 corrections based on a recent reanalysis of photon distribution amplitudes. |
hep-ph/0305052 | Shinichiro Ando | Shin'ichiro Ando, Katsuhiko Sato | Resonant spin-flavor conversion of supernova neutrinos: Dependence on
presupernova models and future prospects | 10 pages, 7 figures, corrected minor typos, added reference. Final
version to appear in Physical Review D | Phys.Rev. D68 (2003) 023003 | 10.1103/PhysRevD.68.023003 | UTAP-439, RESCEU-12/03 | hep-ph astro-ph | null | We study the resonant spin-flavor (RSF) conversion of supernova neutrinos,
which is induced by the interaction between the nonzero neutrino magnetic
moment and the supernova magnetic fields, and its dependence on presupernova
models. As the presupernova models, we adopt the latest ones by Woosley, Heger,
and Weaver, and, further, models with both solar and zero metallicity are
investigated. Since the $(1-2Y_e)$ profile of the new presupernova models,
which is responsible for the RSF conversion, suddenly drops at the resonance
region, the completely adiabatic RSF conversion is not realized, even if
$\mu_\nu B_0= (10^{-12}\mu_B)(10^{10} G)$, where $B_0$ is the strength of the
magnetic field at the surface of the iron core. In particular for the model
with zero metallicity, the conversion is highly nonadiabatic in the high energy
region, reflecting the $(1-2Y_e)$ profile of the model. In calculating the
flavor conversion, we find that the shock wave propagation, which changes
density profiles drastically, is a much more severe problem than it is for the
pure Mikheyev-Smirnov-Wolfenstein (MSW) conversion case. This is because the
RSF effect occurs at a far deeper region than the MSW effect. To avoid the
uncertainty concerning the shock propagation, we restrict our discussion to 0.5
s after the core bounce (and for more conservative discussion, 0.25 s), during
which the shock wave is not expected to affect the RSF region. We also evaluate
the energy spectrum at the Super-Kamiokande detector for various models using
the calculated conversion probabilities, and find that it is very difficult to
obtain useful information on the supernova metallicities and magnetic fields or
on the neutrino magnetic moment from the supernova neutrino observation. Future
prospects are also discussed.
| [
{
"created": "Tue, 6 May 2003 01:58:22 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2003 11:05:47 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ando",
"Shin'ichiro",
""
],
[
"Sato",
"Katsuhiko",
""
]
] | We study the resonant spin-flavor (RSF) conversion of supernova neutrinos, which is induced by the interaction between the nonzero neutrino magnetic moment and the supernova magnetic fields, and its dependence on presupernova models. As the presupernova models, we adopt the latest ones by Woosley, Heger, and Weaver, and, further, models with both solar and zero metallicity are investigated. Since the $(1-2Y_e)$ profile of the new presupernova models, which is responsible for the RSF conversion, suddenly drops at the resonance region, the completely adiabatic RSF conversion is not realized, even if $\mu_\nu B_0= (10^{-12}\mu_B)(10^{10} G)$, where $B_0$ is the strength of the magnetic field at the surface of the iron core. In particular for the model with zero metallicity, the conversion is highly nonadiabatic in the high energy region, reflecting the $(1-2Y_e)$ profile of the model. In calculating the flavor conversion, we find that the shock wave propagation, which changes density profiles drastically, is a much more severe problem than it is for the pure Mikheyev-Smirnov-Wolfenstein (MSW) conversion case. This is because the RSF effect occurs at a far deeper region than the MSW effect. To avoid the uncertainty concerning the shock propagation, we restrict our discussion to 0.5 s after the core bounce (and for more conservative discussion, 0.25 s), during which the shock wave is not expected to affect the RSF region. We also evaluate the energy spectrum at the Super-Kamiokande detector for various models using the calculated conversion probabilities, and find that it is very difficult to obtain useful information on the supernova metallicities and magnetic fields or on the neutrino magnetic moment from the supernova neutrino observation. Future prospects are also discussed. |
1902.08235 | Julio Leite | Alex G. Dias and Julio Leite | Natural quark mixing and inverse seesaw in a left-right model with an
axion | 25 pages. Version accepted for publication in JHEP | null | 10.1007/JHEP05(2019)078 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a minimal left-right model with a Peccei-Quinn symmetry, where
generalised charge conjugation plays the role of the left-right symmetry. We
show how the spontaneous breaking of the Peccei-Quinn symmetry by a scalar
singlet can provide us with solutions not only to the strong CP and dark matter
problems but can also help to generate naturally suppressed off-diagonal CKM
elements and small neutrino masses via the inverse seesaw mechanism. For this,
we make use of an economical scalar sector composed of a bi-doublet, two
doublets and a singlet only. As a result of the new gauge bosons and neutrinos,
the neutrinoless double beta decay, as well as lepton flavour violating
processes, receives new contributions which can, in principle, become relevant
due to the low-scale nature of the inverse seesaw mechanism. The model can
easily accommodate all the current data on fermion masses and mixing even if
the left-right scale is only high enough to evade the current experimental
constraints.
| [
{
"created": "Thu, 21 Feb 2019 19:57:35 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2019 18:45:01 GMT",
"version": "v2"
},
{
"created": "Thu, 16 May 2019 15:42:47 GMT",
"version": "v3"
}
] | 2019-06-26 | [
[
"Dias",
"Alex G.",
""
],
[
"Leite",
"Julio",
""
]
] | We consider a minimal left-right model with a Peccei-Quinn symmetry, where generalised charge conjugation plays the role of the left-right symmetry. We show how the spontaneous breaking of the Peccei-Quinn symmetry by a scalar singlet can provide us with solutions not only to the strong CP and dark matter problems but can also help to generate naturally suppressed off-diagonal CKM elements and small neutrino masses via the inverse seesaw mechanism. For this, we make use of an economical scalar sector composed of a bi-doublet, two doublets and a singlet only. As a result of the new gauge bosons and neutrinos, the neutrinoless double beta decay, as well as lepton flavour violating processes, receives new contributions which can, in principle, become relevant due to the low-scale nature of the inverse seesaw mechanism. The model can easily accommodate all the current data on fermion masses and mixing even if the left-right scale is only high enough to evade the current experimental constraints. |
1305.4061 | Eva Popenda | Ryan Gavin, Christian Hangst, Michael Kr\"amer, Margarete
M\"uhlleitner, Mathieu Pellen, Eva Popenda, Michael Spira | Matching Squark Pair Production at NLO with Parton Showers | 42 pages, 21 figures, reference added, minor typos corrected, version
accepted by JHEP | JHEP 10 (2013) 187 | 10.1007/JHEP10(2013)187 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pair production of squarks is one of the main search channels for
supersymmetry at the LHC. We present a fully differential calculation of the
next-to-leading order (NLO) SUSY-QCD corrections to the on-shell production of
a pair of squarks in the Minimal Supersymmetric Standard Model (MSSM),
supplemented by the leading-order decay of the squarks to the lightest
neutralino and a quark. In addition, we use the Powheg method to match our NLO
calculation with parton showers. To this end, the process was implemented in
the Powheg-Box framework and interfaced with Pythia6 and Herwig++. We study the
differential scale dependence and K-factors, and investigate the effects of the
parton showers for a benchmark scenario in the constrained MSSM.
| [
{
"created": "Fri, 17 May 2013 12:27:49 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2014 14:36:59 GMT",
"version": "v2"
}
] | 2014-02-17 | [
[
"Gavin",
"Ryan",
""
],
[
"Hangst",
"Christian",
""
],
[
"Krämer",
"Michael",
""
],
[
"Mühlleitner",
"Margarete",
""
],
[
"Pellen",
"Mathieu",
""
],
[
"Popenda",
"Eva",
""
],
[
"Spira",
"Michael",
""
]
] | The pair production of squarks is one of the main search channels for supersymmetry at the LHC. We present a fully differential calculation of the next-to-leading order (NLO) SUSY-QCD corrections to the on-shell production of a pair of squarks in the Minimal Supersymmetric Standard Model (MSSM), supplemented by the leading-order decay of the squarks to the lightest neutralino and a quark. In addition, we use the Powheg method to match our NLO calculation with parton showers. To this end, the process was implemented in the Powheg-Box framework and interfaced with Pythia6 and Herwig++. We study the differential scale dependence and K-factors, and investigate the effects of the parton showers for a benchmark scenario in the constrained MSSM. |
1003.2625 | K. S. Babu | K.S. Babu, Jogesh C. Pati, Zurab Tavartkiladze | Constraining Proton Lifetime in SO(10) with Stabilized Doublet-Triplet
Splitting | 21 pages LaTeX, 2 figures, Few explanatory sentences and three new
references added, minor typos corrected. | JHEP 1006:084,2010 | 10.1007/JHEP06(2010)084 | OSU-HEP-10-01, SLAC-PUB-13732 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of realistic unified models based on supersymmetric SO(10)
wherein issues related to natural doublet-triplet (DT) splitting are fully
resolved. Using a minimal set of low dimensional Higgs fields which includes a
single adjoint, we show that the Dimopoulos--Wilzcek mechanism for DT splitting
can be made stable in the presence of all higher order operators without having
pseudo-Goldstone bosons and flat directions. The \mu term of order TeV is found
to be naturally induced. A Z_2-assisted anomalous U(1)_A gauge symmetry plays a
crucial role in achieving these results. The threshold corrections to
alpha_3(M_Z), somewhat surprisingly, are found to be controlled by only a few
effective parameters. This leads to a very predictive scenario for proton
decay. As a novel feature, we find an interesting correlation between the d=6
(p\to e^+\pi^0) and d=5 (p\to \nu-bar K+) decay amplitudes which allows us to
derive a constrained upper limit on the inverse rate of the e^+\pi^0 mode. Our
results show that both modes should be observed with an improvement in the
current sensitivity by about a factor of five to ten.
| [
{
"created": "Fri, 12 Mar 2010 20:57:44 GMT",
"version": "v1"
},
{
"created": "Sat, 8 May 2010 03:31:55 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Babu",
"K. S.",
""
],
[
"Pati",
"Jogesh C.",
""
],
[
"Tavartkiladze",
"Zurab",
""
]
] | We present a class of realistic unified models based on supersymmetric SO(10) wherein issues related to natural doublet-triplet (DT) splitting are fully resolved. Using a minimal set of low dimensional Higgs fields which includes a single adjoint, we show that the Dimopoulos--Wilzcek mechanism for DT splitting can be made stable in the presence of all higher order operators without having pseudo-Goldstone bosons and flat directions. The \mu term of order TeV is found to be naturally induced. A Z_2-assisted anomalous U(1)_A gauge symmetry plays a crucial role in achieving these results. The threshold corrections to alpha_3(M_Z), somewhat surprisingly, are found to be controlled by only a few effective parameters. This leads to a very predictive scenario for proton decay. As a novel feature, we find an interesting correlation between the d=6 (p\to e^+\pi^0) and d=5 (p\to \nu-bar K+) decay amplitudes which allows us to derive a constrained upper limit on the inverse rate of the e^+\pi^0 mode. Our results show that both modes should be observed with an improvement in the current sensitivity by about a factor of five to ten. |
1111.3936 | Jamal Jalilian-Marian | Jamal Jalilian-Marian | On perturbative limits of quadrupole evolution in QCD at high energy | 8 pages, 1 figure | null | 10.1103/PhysRevD.85.014037 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the perturbative (weak field) limit of the small $x$ QCD
evolution equation for quadrupole, the normalized trace of four Wilson lines in
the fundamental representation, which appears in di-hadron angular correlation
in high energy collisions. We linearize the quadrupole evolution equation and
then expand the Wilson lines in powers of $g\, A_{\mu}$ where $A_{\mu}$ is the
gauge field. The quadratic terms in the expansion ($\sim g^2\, A^2$) satisfy
the BFKL equation as has been recently shown. We then consider the quartic
terms ($\sim g^4\, A^4$) in the expansion and show that the linearized
quadrupole evolution equation, written in terms of color charge density $\rho$,
reduces to the well-known BJKP equation for the imaginary part of
four-reggeized gluon exchange amplitude. We comment on the possibility that the
BJKP equation for the evolution of a $n$-reggeized gluon state can be obtained
from the JIMWLK evolution equation for the normalized trace of $n$ fundamental
Wilson lines when non-linear (recombination) terms are neglected.
| [
{
"created": "Wed, 16 Nov 2011 20:15:27 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Jalilian-Marian",
"Jamal",
""
]
] | We consider the perturbative (weak field) limit of the small $x$ QCD evolution equation for quadrupole, the normalized trace of four Wilson lines in the fundamental representation, which appears in di-hadron angular correlation in high energy collisions. We linearize the quadrupole evolution equation and then expand the Wilson lines in powers of $g\, A_{\mu}$ where $A_{\mu}$ is the gauge field. The quadratic terms in the expansion ($\sim g^2\, A^2$) satisfy the BFKL equation as has been recently shown. We then consider the quartic terms ($\sim g^4\, A^4$) in the expansion and show that the linearized quadrupole evolution equation, written in terms of color charge density $\rho$, reduces to the well-known BJKP equation for the imaginary part of four-reggeized gluon exchange amplitude. We comment on the possibility that the BJKP equation for the evolution of a $n$-reggeized gluon state can be obtained from the JIMWLK evolution equation for the normalized trace of $n$ fundamental Wilson lines when non-linear (recombination) terms are neglected. |
hep-ph/9902470 | Borut Bajc | Borut Bajc | SUSY and Symmetry Nonrestoration at High Temperature | latex, 10 pages; talk given at COSMO-98, International Workshop on
Particle Physics and the Early Universe, November 15-20, 1998, Asilomar,
Monterey, California, USA; slightly enlarged version of the one that will
appear in the Proceedings | null | 10.1063/1.59403 | IJS-TP-99/04 | hep-ph | null | The status of internal symmetry breaking at high temperature in
supersymmetric models is reviewed. This phenomenon could solve some well known
cosmological problems, such as the domain wall, monopole and false vacuum
problems.
| [
{
"created": "Thu, 25 Feb 1999 22:57:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bajc",
"Borut",
""
]
] | The status of internal symmetry breaking at high temperature in supersymmetric models is reviewed. This phenomenon could solve some well known cosmological problems, such as the domain wall, monopole and false vacuum problems. |
0805.1684 | Kazunori Itakura | K.Itakura, O.Morimatsu, H.Otomo | Shear viscosity of hadronic gas mixtures | 4pages, 5 figures, presented at the 20th International Conference on
Ultra-Relativistic Nucleus-Nucleus Collisions (QM2008) | J.Phys.G35:104149,2008 | 10.1088/0954-3899/35/10/104149 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effects of baryon chemical potential \mu on the shear
viscosity coefficient \eta and the viscosity to entropy density ratio \eta/s of
a pion-nucleon gas mixture. We find that \eta is an increasing function of T
and \mu, while the ratio \eta/s turns to a decreasing function in a wide region
of T-\mu plane. In the kinematical region we studied, the smallest value of
\eta/s is about 0.3.
| [
{
"created": "Mon, 12 May 2008 16:53:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Itakura",
"K.",
""
],
[
"Morimatsu",
"O.",
""
],
[
"Otomo",
"H.",
""
]
] | We investigate the effects of baryon chemical potential \mu on the shear viscosity coefficient \eta and the viscosity to entropy density ratio \eta/s of a pion-nucleon gas mixture. We find that \eta is an increasing function of T and \mu, while the ratio \eta/s turns to a decreasing function in a wide region of T-\mu plane. In the kinematical region we studied, the smallest value of \eta/s is about 0.3. |
1006.1458 | Eibun Senaha | Kingman Cheung, Tie-Jiun Hou, Jae Sik Lee, Eibun Senaha | Higgs Boson Sector of the Next-to-MSSM with CP Violation | 40 pages, 49 figures; v2: typos corrected and references added; v3:
some clarification and new figures added, version published in PRD | Phys.Rev.D82:075007,2010 | 10.1103/PhysRevD.82.075007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a comprehensive study of the Higgs sector in the framework of the
next-to-minimal supersymmetric standard model with CP-violating parameters in
the superpotential and in the soft-supersymmetry-breaking sector. Since the CP
is no longer a good symmetry, the two CP-odd and the three CP-even Higgs bosons
of the next-to-minimal supersymmetric standard model in the CP-conserving limit
will mix. We show explicitly how the mass spectrum and couplings to gauge
bosons of the various Higgs bosons change when the CP-violating phases take on
nonzero values. We include full one-loop and the logarithmically enhanced
two-loop effects employing the renormalization-group (RG) improved approach. In
addition, the LEP limits, the global minimum condition, and the positivity of
the square of the Higgs-boson mass have been imposed. We demonstrate the
effects on the Higgs-mass spectrum and the couplings to gauge bosons with and
without the RG-improved corrections. Substantial modifications to the allowed
parameter space happen because of the changes to the Higgs-boson spectrum and
their couplings with the RG-improved corrections. Finally, we calculate the
mass spectrum and couplings of the few selected scenarios and compare to the
previous results in literature where possible; in particular, we illustrate a
scenario motivated by electroweak baryogenesis.
| [
{
"created": "Tue, 8 Jun 2010 06:11:45 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 2010 14:56:34 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Oct 2010 12:38:36 GMT",
"version": "v3"
}
] | 2014-11-21 | [
[
"Cheung",
"Kingman",
""
],
[
"Hou",
"Tie-Jiun",
""
],
[
"Lee",
"Jae Sik",
""
],
[
"Senaha",
"Eibun",
""
]
] | We perform a comprehensive study of the Higgs sector in the framework of the next-to-minimal supersymmetric standard model with CP-violating parameters in the superpotential and in the soft-supersymmetry-breaking sector. Since the CP is no longer a good symmetry, the two CP-odd and the three CP-even Higgs bosons of the next-to-minimal supersymmetric standard model in the CP-conserving limit will mix. We show explicitly how the mass spectrum and couplings to gauge bosons of the various Higgs bosons change when the CP-violating phases take on nonzero values. We include full one-loop and the logarithmically enhanced two-loop effects employing the renormalization-group (RG) improved approach. In addition, the LEP limits, the global minimum condition, and the positivity of the square of the Higgs-boson mass have been imposed. We demonstrate the effects on the Higgs-mass spectrum and the couplings to gauge bosons with and without the RG-improved corrections. Substantial modifications to the allowed parameter space happen because of the changes to the Higgs-boson spectrum and their couplings with the RG-improved corrections. Finally, we calculate the mass spectrum and couplings of the few selected scenarios and compare to the previous results in literature where possible; in particular, we illustrate a scenario motivated by electroweak baryogenesis. |
hep-ph/0103281 | Per Osland | Per Osland (Bergen) and Tai Tsun Wu (Harvard and CERN) | Three-Neutrino MSW Effect and the LNW Mass Matrix | 7 pages, presented at Scandinavian Neutrino Workshop, Uppsala,
February 8-10, 2001, to appear in the proceedings, Physica Scripta.
Conference info at http://www3.tsl.uu.se/~damet/neutrino/first.html | Phys.Scripta T93 (2001) 37-40 | 10.1238/Physica.Topical.093a00037 | null | hep-ph | null | We review recent work on analytical solutions to the MSW equations for three
neutrino flavours, for exponential and linear potentials. An application to a
particular mass matrix is also discussed. The three neutrino masses are
determined, respectively, to be 0.001--0.004, and roughly 0.01 and 0.05 eV.
| [
{
"created": "Tue, 27 Mar 2001 06:35:08 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Osland",
"Per",
"",
"Bergen"
],
[
"Wu",
"Tai Tsun",
"",
"Harvard and CERN"
]
] | We review recent work on analytical solutions to the MSW equations for three neutrino flavours, for exponential and linear potentials. An application to a particular mass matrix is also discussed. The three neutrino masses are determined, respectively, to be 0.001--0.004, and roughly 0.01 and 0.05 eV. |
0707.3414 | D. P. Roy | D. P. Roy | Probing the Two Greatest Mysteries of the Universe | 6 pages, 2 figures, Foreward to the Proc of the Workshop on
Neutrinoless Double Beta Decay, Ahmedabad, India, Narosa Publishing House
(2007) | null | null | null | hep-ph | null | The neutrinoless double beta decay and the direct dark matter detection
experiments probe the origins of the two greatest mysteries of the universe,
i.e. the baryon asymmetry and the invisible or dark matter. The underlying
theoretical ideas are briefly discussed along with the experimental prospects.
| [
{
"created": "Mon, 23 Jul 2007 16:55:21 GMT",
"version": "v1"
}
] | 2007-07-24 | [
[
"Roy",
"D. P.",
""
]
] | The neutrinoless double beta decay and the direct dark matter detection experiments probe the origins of the two greatest mysteries of the universe, i.e. the baryon asymmetry and the invisible or dark matter. The underlying theoretical ideas are briefly discussed along with the experimental prospects. |
hep-ph/9902248 | Philipp Haegler | Ph. Hagler, A. Schafer, R. Kirschner, L. Szymanowski | The gluon field of a fast moving nucleus and the effective langrangian
for QCD at high energy | 13 pages, 4 figures. v2: eq. 18 corrected, modified discussion of the
relation between the standard and the effective lagrangian approach | Phys. Rev. D 60, 054006 (1999) | 10.1103/PhysRevD.60.054006 | TPR-99-05 | hep-ph | null | Starting from the effective lagrangian for QCD at high energy we calculate
the lowest perturbative contributions to the potential of a relativistic
nucleus and compare our results to those derived by Kovchegov (see Y.V.
Kovchegov, Phys. Rev. {\bf D55}, 5445 (1997)). The results differ already at
order g^3 which can be traced to the fact that the meaning of the underlying
gluon fields is different. (The effective gluon field we use is a gauge
invariant object.) Both approaches should therefore be seen as alternatives,
the relative merits of which have to be judged by their phenomenological
success.
| [
{
"created": "Fri, 5 Feb 1999 15:18:18 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Feb 1999 16:23:43 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Hagler",
"Ph.",
""
],
[
"Schafer",
"A.",
""
],
[
"Kirschner",
"R.",
""
],
[
"Szymanowski",
"L.",
""
]
] | Starting from the effective lagrangian for QCD at high energy we calculate the lowest perturbative contributions to the potential of a relativistic nucleus and compare our results to those derived by Kovchegov (see Y.V. Kovchegov, Phys. Rev. {\bf D55}, 5445 (1997)). The results differ already at order g^3 which can be traced to the fact that the meaning of the underlying gluon fields is different. (The effective gluon field we use is a gauge invariant object.) Both approaches should therefore be seen as alternatives, the relative merits of which have to be judged by their phenomenological success. |
0706.0487 | Enrico Nardi | Enrico Nardi | Recent Issues in Leptogenesis | Talk given at the XLII Rencontres de Moriond, La Thuile, Aosta
Valley, Italy, March 10 - 17, 2007. One paragraph corrected, one reference
added. 8 pages, 2 figures | null | null | null | hep-ph | null | Baryogenesis via leptogenesis provides an appealing mechanism to explain the
observed baryon asymmetry of the Universe. Recent refinements in the
understanding of the dynamics of leptogenesis include detailed studies of the
effects of lepton flavors and of the role possibly played by the lepton
asymmetries generated in the decays of the heavier singlet neutrinos $N_{2,3}$.
A review of these recent developments in the theory of leptogenesis is
presented.
| [
{
"created": "Mon, 4 Jun 2007 17:39:30 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jun 2007 13:10:14 GMT",
"version": "v2"
}
] | 2007-06-11 | [
[
"Nardi",
"Enrico",
""
]
] | Baryogenesis via leptogenesis provides an appealing mechanism to explain the observed baryon asymmetry of the Universe. Recent refinements in the understanding of the dynamics of leptogenesis include detailed studies of the effects of lepton flavors and of the role possibly played by the lepton asymmetries generated in the decays of the heavier singlet neutrinos $N_{2,3}$. A review of these recent developments in the theory of leptogenesis is presented. |
hep-ph/9609414 | Michel Tytgat | Robert D. Pisarski and Michel Tytgat | On the Physics of a Cool Pion Gas | 5 pages, 1 figure. Talk given at the "Rhic Summer Studies '96",
Brookhaven National Laboratory, Upton, USA. July 96 | null | null | null | hep-ph nucl-th | null | At finite temperature, the Nambu-Goldstone bosons of a spontaneously broken
chiral symmetry travel at a velocity $v < 1$. This effect first appears at
order $\sim T^4$ in an expansion about low temperature, and can be related to
the appearence of two distinct pion decay constants in a thermal bath. We
discuss some consequences on the thermodynamics of a gas of massless pions.
| [
{
"created": "Thu, 19 Sep 1996 20:22:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pisarski",
"Robert D.",
""
],
[
"Tytgat",
"Michel",
""
]
] | At finite temperature, the Nambu-Goldstone bosons of a spontaneously broken chiral symmetry travel at a velocity $v < 1$. This effect first appears at order $\sim T^4$ in an expansion about low temperature, and can be related to the appearence of two distinct pion decay constants in a thermal bath. We discuss some consequences on the thermodynamics of a gas of massless pions. |
hep-ph/0101203 | Thorsten Renk | Thorsten Renk | Note on the Impact Parameter Analysis of High Energy Proton Proton
Collisions | 8 pages, 5 figures, accepted for publication EPJA, revised version | Eur.Phys.J. A11 (2001) 251-255 | 10.1007/s100500170061 | TUM/T39-01-01 | hep-ph | null | Following prior analysis for measured pp elastic differential cross section,
the impact parameter representation in terms of profile functions is calculated
from two different parameterizations on single diffractive dissociation data.
The derivative of this quantity with respect to the collision energy squared s
measures the growth rate of the reaction's blackness. Its distribution in
impact parameter space allows detailed insight into the growth pattern of the
total cross section and the approaching unitarity limit. Comparing the results
with the elastic case, the different mechanisms of unitarization of the two
parametrizations are discussed.
| [
{
"created": "Thu, 18 Jan 2001 14:42:04 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jul 2001 09:04:53 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Renk",
"Thorsten",
""
]
] | Following prior analysis for measured pp elastic differential cross section, the impact parameter representation in terms of profile functions is calculated from two different parameterizations on single diffractive dissociation data. The derivative of this quantity with respect to the collision energy squared s measures the growth rate of the reaction's blackness. Its distribution in impact parameter space allows detailed insight into the growth pattern of the total cross section and the approaching unitarity limit. Comparing the results with the elastic case, the different mechanisms of unitarization of the two parametrizations are discussed. |
hep-ph/9904461 | Thomas Gutsche | M. Strohmeier-Presicek, T. Gutsche, R. Vinh Mau and Amand Faessler | Glueball-quarkonia content and decay of scalar-isoscalar mesons | 52 pages, 6 figures, to appear in Phys. Rev. D | Phys.Rev. D60 (1999) 054010 | 10.1103/PhysRevD.60.054010 | null | hep-ph | null | We investigate the hadronic two-body decay modes of the scalar-isoscalar
$f_0(1370)$, $f_0(1500)$ and $f_0(1710)$ states as resulting from the mixture
of the lowest lying scalar glueball with the isoscalar states of the ground
state $^3P_0$ $Q\bar Q$ nonet. In the decay analysis we take into account the
direct coupling of the quarkonia and glueball components of the $f_0$ states to
the quarkonia components of the two-meson final state with the decay dynamics
inspired by the strong coupling limit of QCD. We calculate partial decay widths
for the $f_0$ states in the proposed three-state mixing schemes and discuss
their compatibility with the observed decay features. Finally, we determine the
glueball-quarkonia content of the $f_0$ states from a detailed fit to
experimental decay data of $f_0(1500)$ and give predictions for the partial
decay widths of $f_0(1370)$ and $f_0(1710)$, providing thus a sensitive test of
the proposed mixing scheme.
| [
{
"created": "Tue, 27 Apr 1999 09:08:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Strohmeier-Presicek",
"M.",
""
],
[
"Gutsche",
"T.",
""
],
[
"Mau",
"R. Vinh",
""
],
[
"Faessler",
"Amand",
""
]
] | We investigate the hadronic two-body decay modes of the scalar-isoscalar $f_0(1370)$, $f_0(1500)$ and $f_0(1710)$ states as resulting from the mixture of the lowest lying scalar glueball with the isoscalar states of the ground state $^3P_0$ $Q\bar Q$ nonet. In the decay analysis we take into account the direct coupling of the quarkonia and glueball components of the $f_0$ states to the quarkonia components of the two-meson final state with the decay dynamics inspired by the strong coupling limit of QCD. We calculate partial decay widths for the $f_0$ states in the proposed three-state mixing schemes and discuss their compatibility with the observed decay features. Finally, we determine the glueball-quarkonia content of the $f_0$ states from a detailed fit to experimental decay data of $f_0(1500)$ and give predictions for the partial decay widths of $f_0(1370)$ and $f_0(1710)$, providing thus a sensitive test of the proposed mixing scheme. |
1312.3252 | Alexander Karlberg | Barbara Jager, Alexander Karlberg, Giulia Zanderighi | Electroweak $ZZjj$ production in the Standard Model and beyond in the
POWHEG-BOX V2 | 19 pages, 18 figures,5 tables | null | 10.1007/JHEP03(2014)141 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an implementation of electroweak $ZZjj$ production in the POWHEG
BOX V2 framework, an upgrade of the POWHEG BOX program which includes a number
of new features that are particularly helpful for high-multiplicity processes.
We consider leptonic and semi-leptonic decay modes of the Z bosons, and take
non-resonant contributions and spin correlations of the final-state particles
into account. In the case of decays to leptons, we also include interactions
beyond the Standard Model that arise from an effective Lagrangian which
includes CP conserving and violating operators up to dimension six. We find
that while leptonic distributions are very sensitive to anomalous couplings,
because of the small cross-section involved, these analyses are feasible only
after a high-luminosity upgrade of the LHC. We consider the cases of a 14 TeV,
33 TeV and 100 TeV machine and discuss the limits that can be placed on those
couplings for different luminosities.
| [
{
"created": "Wed, 11 Dec 2013 17:26:44 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Jager",
"Barbara",
""
],
[
"Karlberg",
"Alexander",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We present an implementation of electroweak $ZZjj$ production in the POWHEG BOX V2 framework, an upgrade of the POWHEG BOX program which includes a number of new features that are particularly helpful for high-multiplicity processes. We consider leptonic and semi-leptonic decay modes of the Z bosons, and take non-resonant contributions and spin correlations of the final-state particles into account. In the case of decays to leptons, we also include interactions beyond the Standard Model that arise from an effective Lagrangian which includes CP conserving and violating operators up to dimension six. We find that while leptonic distributions are very sensitive to anomalous couplings, because of the small cross-section involved, these analyses are feasible only after a high-luminosity upgrade of the LHC. We consider the cases of a 14 TeV, 33 TeV and 100 TeV machine and discuss the limits that can be placed on those couplings for different luminosities. |
hep-ph/9810215 | Carl R. Schmidt | Vittorio Del Duca and Carl R. Schmidt | Virtual Next-to-Leading Corrections to the Lipatov Vertex | Latex, 20 pages, no figures; One minor typo fixed. References added.
To be published in Phys. Rev. D | Phys. Rev. D 59, 074004 (1999) | 10.1103/PhysRevD.59.074004 | EDINBURGH 98/21, MSUHEP-80928 | hep-ph | null | We compute the virtual next-to-leading corrections to the Lipatov vertex in
the helicity-amplitude formalism. These agree with previous results by Fadin
and collaborators, in the conventional dimensional-regularization scheme. We
discuss the choice of reggeization scale in order to minimize its impact on the
next-to-leading-logarithmic corrections to the BFKL equation.
| [
{
"created": "Thu, 1 Oct 1998 20:34:46 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 1999 22:34:04 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Del Duca",
"Vittorio",
""
],
[
"Schmidt",
"Carl R.",
""
]
] | We compute the virtual next-to-leading corrections to the Lipatov vertex in the helicity-amplitude formalism. These agree with previous results by Fadin and collaborators, in the conventional dimensional-regularization scheme. We discuss the choice of reggeization scale in order to minimize its impact on the next-to-leading-logarithmic corrections to the BFKL equation. |
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