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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0201096 | Peter Petreczky | P. Petreczky | Quarkonium Suppression | Invited plenary talk presented on 4th International Conference on
Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP-2001), November
26-30, 2001, Jaipur; 12 pp, LaTeX, uses pramana.sty | Pramana 60:829-840,2003 | 10.1007/BF02705178 | null | hep-ph hep-lat | null | I discuss quarkonium suppression in equilibriated strongly interacting
matter. After a brief review of basic features of quarkonium production I
discuss the application of recent lattice data on the heavy quark potential to
the problem of quarkonium dissociation as well as the problem of direct lattice
determination of quarkonium properties in finite temperature lattice QCD.
| [
{
"created": "Fri, 11 Jan 2002 18:56:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Petreczky",
"P.",
""
]
] | I discuss quarkonium suppression in equilibriated strongly interacting matter. After a brief review of basic features of quarkonium production I discuss the application of recent lattice data on the heavy quark potential to the problem of quarkonium dissociation as well as the problem of direct lattice determination of quarkonium properties in finite temperature lattice QCD. |
1505.08066 | Wen Chao Zhang | W. C. Zhang | Scaling behaviours of the $p_{T}$ spectra for identified hadrons in $pp$
collisions | Accepted by J. Phys. G: Nucl. Part. Phys. 6 EPS figures included | J. Phys. G: Nucl. Part. Phys. 43, 015003, 2016 | 10.1088/0954-3899/43/1/015003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the scaling behaviour observed in the inclusive charged hadron
transverse momentum ($p_{T}$) distributions to the $p_{T}$ spectra of pions,
kaons and protons produced in proton-proton ($pp$) collisions with center of
mass energies ($\sqrt{s}$ ) at 0.9, 2.76 and 7 TeV. This scaling behaviour
arises when a linear transformation, $p_{T} \rightarrow p_{T}/K$, is applied on
the pion, kaon or proton $p_{T}$ spectra. The scaling parameter $K$ depends on
$\sqrt{s}$ and is determined by a new method, the quality factor method, which
does not rely on the shape of the scaling function. We argue that the pions,
kaons and protons originate from different distributions of clusters which are
formed by strings overlapping, and the scaling behaviours of these identified
particles $p_{T}$ spectra could be understood with the colour string
percolation model in a quantitative way simultaneously.
| [
{
"created": "Fri, 29 May 2015 14:42:39 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Oct 2015 02:00:08 GMT",
"version": "v2"
}
] | 2015-12-10 | [
[
"Zhang",
"W. C.",
""
]
] | We extend the scaling behaviour observed in the inclusive charged hadron transverse momentum ($p_{T}$) distributions to the $p_{T}$ spectra of pions, kaons and protons produced in proton-proton ($pp$) collisions with center of mass energies ($\sqrt{s}$ ) at 0.9, 2.76 and 7 TeV. This scaling behaviour arises when a linear transformation, $p_{T} \rightarrow p_{T}/K$, is applied on the pion, kaon or proton $p_{T}$ spectra. The scaling parameter $K$ depends on $\sqrt{s}$ and is determined by a new method, the quality factor method, which does not rely on the shape of the scaling function. We argue that the pions, kaons and protons originate from different distributions of clusters which are formed by strings overlapping, and the scaling behaviours of these identified particles $p_{T}$ spectra could be understood with the colour string percolation model in a quantitative way simultaneously. |
1007.5291 | Paride Paradisi | Andrzej J. Buras, Gino Isidori, and Paride Paradisi | EDMs vs. CPV in B_{s,d} mixing in two Higgs doublet models with MFV | 9 pages, 8 figures. V2: minor modifications, few typos corrected, few
refs added | Phys.Lett.B694:402-409,2011 | 10.1016/j.physletb.2010.10.032 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the correlations between electric dipole moments (EDMs) of the
neutron and heavy atoms and CP violation in B_{s,d} mixing in two Higgs doublet
models respecting the Minimal Flavour Violation hypothesis, with flavour-blind
CP-violating (CPV) phases. In particular, we consider the case of flavour-blind
CPV phases from i) the Yukawa interactions and ii) the Higgs potential. We show
that in both cases the upper bounds on the above EDMs do not forbid sizable
non-standard CPV effects in B_s mixing. However, if a large CPV phase in B_s
mixing will be confirmed, this will imply EDMs very close to their present
experimental bounds, within the reach of the next generation of experiments, as
well as BR(B_{s,d}-> mu^+ mu^-) typically largely enhanced over its SM
expectation. The two flavour-blind CPV mechanisms can be distinguished through
the correlation between S_psi K_S and S_psi phi that is strikingly different if
only one of them is relevant. Which of these two CPV mechanisms dominates
depends on the precise values of S_psi phi and S_psi K_S, as well as on the CKM
phase (as determined by tree-level processes). Current data seems to show a
mild preference for a hybrid scenario where both these mechanisms are at work.
| [
{
"created": "Thu, 29 Jul 2010 18:42:38 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 2010 14:25:23 GMT",
"version": "v2"
}
] | 2011-06-27 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Isidori",
"Gino",
""
],
[
"Paradisi",
"Paride",
""
]
] | We analyze the correlations between electric dipole moments (EDMs) of the neutron and heavy atoms and CP violation in B_{s,d} mixing in two Higgs doublet models respecting the Minimal Flavour Violation hypothesis, with flavour-blind CP-violating (CPV) phases. In particular, we consider the case of flavour-blind CPV phases from i) the Yukawa interactions and ii) the Higgs potential. We show that in both cases the upper bounds on the above EDMs do not forbid sizable non-standard CPV effects in B_s mixing. However, if a large CPV phase in B_s mixing will be confirmed, this will imply EDMs very close to their present experimental bounds, within the reach of the next generation of experiments, as well as BR(B_{s,d}-> mu^+ mu^-) typically largely enhanced over its SM expectation. The two flavour-blind CPV mechanisms can be distinguished through the correlation between S_psi K_S and S_psi phi that is strikingly different if only one of them is relevant. Which of these two CPV mechanisms dominates depends on the precise values of S_psi phi and S_psi K_S, as well as on the CKM phase (as determined by tree-level processes). Current data seems to show a mild preference for a hybrid scenario where both these mechanisms are at work. |
hep-ph/0605065 | Martin White Mr | Martin J. White | SUSY and Dark Matter Constraints from the LHC | Talk given at the XLIrst Rencontres de Moriond session devoted to
Electroweak Interactions And Unified Theories in March 2006, to be published
in the associated proceedings. 10 pages, 8 figures | Int.J.Mod.Phys.A22:5771-5784,2007 | 10.1142/S0217751X07039006 | null | hep-ph | null | The ability of the LHC to make statements about the dark matter problem is
considered, with a specific focus on supersymmetry. After reviewing the current
strategies for supersymmetry searches at the LHC (in both CMS and ATLAS), some
key ATLAS studies are used to demonstrate how one could establish that SUSY
exists before going on to measure the relic density of a neutralino WIMP
candidate. Finally, the general prospects for success at the LHC are
investigated by looking at different points in the MSSM parameter space.
| [
{
"created": "Fri, 5 May 2006 18:01:21 GMT",
"version": "v1"
}
] | 2010-11-03 | [
[
"White",
"Martin J.",
""
]
] | The ability of the LHC to make statements about the dark matter problem is considered, with a specific focus on supersymmetry. After reviewing the current strategies for supersymmetry searches at the LHC (in both CMS and ATLAS), some key ATLAS studies are used to demonstrate how one could establish that SUSY exists before going on to measure the relic density of a neutralino WIMP candidate. Finally, the general prospects for success at the LHC are investigated by looking at different points in the MSSM parameter space. |
hep-ph/9611235 | Bingsong Zou | B.S. Zou (Queen Mary & Westfield College, London) | pi-pi S-Wave Interaction and 0++ Particles | 5 pages incluing 1 postscript figure | null | null | null | hep-ph | null | From a re-analysis of pi+ pi- -> pi+ pi- and pi+ pi- -> K K data, we found
for pi-pi S-wave interaction below 2 GeV, sigma(400), f0(980), f0(1500) and
f0(1780) clearly show up. f0(1370) can be included with a very small branching
ratio to pi-pi. f0(1300) and f0(1590) are not real resonances and are due to
interference effects of above resonances. The sigma(400) with a width about 700
MeV is mainly produced by t-channel exchange force.
| [
{
"created": "Tue, 5 Nov 1996 11:38:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zou",
"B. S.",
"",
"Queen Mary & Westfield College, London"
]
] | From a re-analysis of pi+ pi- -> pi+ pi- and pi+ pi- -> K K data, we found for pi-pi S-wave interaction below 2 GeV, sigma(400), f0(980), f0(1500) and f0(1780) clearly show up. f0(1370) can be included with a very small branching ratio to pi-pi. f0(1300) and f0(1590) are not real resonances and are due to interference effects of above resonances. The sigma(400) with a width about 700 MeV is mainly produced by t-channel exchange force. |
2201.00341 | Ulf-G. Mei{\ss}ner | Ulf-G. Mei{\ss}ner | Chiral Dynamics: Theory and Experiment -- A Tribute to Aron Bernstein | 16 pages, 7 figures, 1 table, opening talk 10th Workshop on Chiral
Dynamics - Theory and Experiment (CD2021), Beijing, September 2021 (online) | null | null | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review and discuss the contributions of Aron Bernstein to the field of
chiral dynamics.
| [
{
"created": "Sun, 2 Jan 2022 11:40:12 GMT",
"version": "v1"
}
] | 2022-01-04 | [
[
"Meißner",
"Ulf-G.",
""
]
] | I review and discuss the contributions of Aron Bernstein to the field of chiral dynamics. |
1311.1775 | Hyejung St\"ockinger-Kim | Helvecio Fargnoli, Christoph Gnendiger, Sebastian Pa{\ss}ehr, Dominik
St\"ockinger, Hyejung St\"ockinger-Kim | Two-Loop Corrections to the Muon Magnetic Moment from Fermion/Sfermion
Loops in the MSSM: Detailed Results | 56 pages, 20 figures. v2 is the journal version. The Mathematica code
amu2Lapprox.m for the compact approximation formula can be obtained from
http://iktp.tu-dresden.de/?id=theory-software | null | 10.1007/JHEP02(2014)070 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, first results were presented for two-loop corrections to the muon
(g-2) from fermion/sfermion loops in the MSSM. These corrections were shown to
be generally large and even logarithmically enhanced for heavy sfermions. Here,
full details of the calculation and analytical results are presented. Also, a
very compact formula is provided which can be easily implemented and serves as
a good approximation of the full result as a function of the fourteen most
important input parameters. Finally, a thorough discussion of the numerical
behaviour of the fermion/sfermion-loop corrections to (g-2)_\mu\ is given. The
discussion includes the case of very heavy SUSY masses as well as
experimentally allowed scenarios with very light SUSY masses.
| [
{
"created": "Thu, 7 Nov 2013 18:20:42 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jun 2014 12:36:38 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Fargnoli",
"Helvecio",
""
],
[
"Gnendiger",
"Christoph",
""
],
[
"Paßehr",
"Sebastian",
""
],
[
"Stöckinger",
"Dominik",
""
],
[
"Stöckinger-Kim",
"Hyejung",
""
]
] | Recently, first results were presented for two-loop corrections to the muon (g-2) from fermion/sfermion loops in the MSSM. These corrections were shown to be generally large and even logarithmically enhanced for heavy sfermions. Here, full details of the calculation and analytical results are presented. Also, a very compact formula is provided which can be easily implemented and serves as a good approximation of the full result as a function of the fourteen most important input parameters. Finally, a thorough discussion of the numerical behaviour of the fermion/sfermion-loop corrections to (g-2)_\mu\ is given. The discussion includes the case of very heavy SUSY masses as well as experimentally allowed scenarios with very light SUSY masses. |
hep-ph/9605224 | Lawrence Hall | Riccardo Barbieri, Lawrence Hall | A Grand Unified Supersymmetric Theory of Flavor | 38 pages, 3 Postscript figures | Nuovo Cim. A110 (1997) 1-30 | null | LBL-38381 | hep-ph | null | A grand unified $SU(5)$ theory is constructed with a hierarchical breaking of
a $U(2)$ flavor symmetry. The small parameters of the squark and slepton mass
matrices, necessary to solve the supersymmetric flavor-changing problem, and
the inter-generational quark and lepton mass hierarchies are both generated
from the $U(2)$ symmetry breaking parameters. The flavor interactions of the
theory are tightly constrained, with just 10 free real parameters for both the
fermion and scalar sectors. All but one of the 8 small fermion mass ratios, and
all of the 3 small Cabibbo-Kobayashi-Maskawa mixing angles, can be understood
without introducing small dimensionless Yukawa parameters. Predictions are made
for 2 of the Cabibbo-Kobayashi-Maskawa mixing angles and for 2 of the fermion
masses. The six flavor mixing matrices which appear at the neutralino vertices,
and which in general are arbitrary unitary matrices, are determined in terms of
just a single free parameter.
| [
{
"created": "Fri, 3 May 1996 22:01:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Hall",
"Lawrence",
""
]
] | A grand unified $SU(5)$ theory is constructed with a hierarchical breaking of a $U(2)$ flavor symmetry. The small parameters of the squark and slepton mass matrices, necessary to solve the supersymmetric flavor-changing problem, and the inter-generational quark and lepton mass hierarchies are both generated from the $U(2)$ symmetry breaking parameters. The flavor interactions of the theory are tightly constrained, with just 10 free real parameters for both the fermion and scalar sectors. All but one of the 8 small fermion mass ratios, and all of the 3 small Cabibbo-Kobayashi-Maskawa mixing angles, can be understood without introducing small dimensionless Yukawa parameters. Predictions are made for 2 of the Cabibbo-Kobayashi-Maskawa mixing angles and for 2 of the fermion masses. The six flavor mixing matrices which appear at the neutralino vertices, and which in general are arbitrary unitary matrices, are determined in terms of just a single free parameter. |
hep-ph/0106063 | Hans-Peter Nilles | Hans Peter Nilles | Hidden Sector Supergravity Breakdown | 14 pages, Latex, Invited talk presented at the symposium "Thirty
Years of Supersymmetry", University of Minnesota, October 13-15, 2000 | Nucl.Phys.Proc.Suppl. 101 (2001) 237-250 | 10.1016/S0920-5632(01)01508-0 | null | hep-ph hep-th | null | Gravity mediated supersymmetry breakdown originated from a study of gaugino
condensation in a hidden sector. We review this mechanism of supergravity
breakdown from the original formulation in the early eighties to its natural
implementation in superstring theory and M-theory. In the latter case hidden
and observable sector become separated geometrically and supersymmetry is
broken dynamically on a hidden wall.
| [
{
"created": "Wed, 6 Jun 2001 08:36:46 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Nilles",
"Hans Peter",
""
]
] | Gravity mediated supersymmetry breakdown originated from a study of gaugino condensation in a hidden sector. We review this mechanism of supergravity breakdown from the original formulation in the early eighties to its natural implementation in superstring theory and M-theory. In the latter case hidden and observable sector become separated geometrically and supersymmetry is broken dynamically on a hidden wall. |
hep-ph/9306249 | Kaloshin Alexander E. | A.E.Kaloshin and V.M.Persikov | Is the scalar meson seen in CELLO data on
$\gamma\gamma\rightarrow\pi^+\pi^-$ ? | LaTeX, 9 pages, 4 figures (not included, hard copy available upon
request), ISU-IAP.Th93-04,\ Irkutsk | Phys.Atom.Nucl. 56 (1993) 1417-1420; Yad.Fiz. 56N10 (1993) 203-209 | null | null | hep-ph | null | We analyze the CELLO angular distributions
$\gamma\gamma\rightarrow\pi^+\pi^-$ with the unitary model \cite{KS-86} for
helicity 2 amplitude. In contrast to previous analysis \cite{CELLO} we do not
see any QED damping. The obtained S--wave does not contradict to low--energy
theorem and demonstrates more clealy the resonance--like behaviour near 1.3
Gev.
| [
{
"created": "Wed, 9 Jun 1993 05:47:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kaloshin",
"A. E.",
""
],
[
"Persikov",
"V. M.",
""
]
] | We analyze the CELLO angular distributions $\gamma\gamma\rightarrow\pi^+\pi^-$ with the unitary model \cite{KS-86} for helicity 2 amplitude. In contrast to previous analysis \cite{CELLO} we do not see any QED damping. The obtained S--wave does not contradict to low--energy theorem and demonstrates more clealy the resonance--like behaviour near 1.3 Gev. |
hep-ph/9511441 | null | W.I. Giersche, C.R. Munz (University of Bonn, Germany) | K0 form factor and charge radius in a covariant Salpeter model | 5 pages including 3 uuencoded figures, RevTeX | Phys.Rev.C53:2554-2555,1996 | 10.1103/PhysRevC.53.2554 | Bonn TK-95-33 | hep-ph | null | The electromagnetic form factor for the $K^0$ is calculated in a covariant
formulation of the Salpeter equation for $q\bar q$ - bound states, which has
been presented recently for the mass spectrum, decay properties and form
factors of the light pseudoscalar and vector mesons. The $K^0$ charge radius
dependence on the difference between strange and down constituent quark mass is
discussed.
| [
{
"created": "Tue, 28 Nov 1995 18:25:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Giersche",
"W. I.",
"",
"University of Bonn, Germany"
],
[
"Munz",
"C. R.",
"",
"University of Bonn, Germany"
]
] | The electromagnetic form factor for the $K^0$ is calculated in a covariant formulation of the Salpeter equation for $q\bar q$ - bound states, which has been presented recently for the mass spectrum, decay properties and form factors of the light pseudoscalar and vector mesons. The $K^0$ charge radius dependence on the difference between strange and down constituent quark mass is discussed. |
hep-ph/9702409 | Mariano Quiros | M. Carena, M. Quiros, A. Riotto, I. Vilja and C.E.M. Wagner | Electroweak baryogenesis and low energy supersymmetry | 20 pages, latex + psfig, 3 figures | Nucl.Phys.B503:387-404,1997 | 10.1016/S0550-3213(97)00412-4 | CERN-TH/96-242, IEM-FT-140/96, FERMILAB-Pub-96/271-A,
TURKU-FL-P23-96 | hep-ph | null | Electroweak baryogenesis is an interesting theoretical scenario, which
demands physics beyond the Standard Model at energy scales of the order of the
weak boson masses. It has been recently emphasized that, in the presence of
light stops, the electroweak phase transition can be strongly first order,
opening the window for electroweak baryogenesis in the MSSM. For the
realization of this scenario, the Higgs boson must be light, at the reach of
the LEP2 collider. In this article, we compute the baryon asymmetry assuming
the presence of non-trivial CP violating phases in the parameters associated
with the left-right stop mixing term and the Higgsino mass $\mu$. We conclude
that a phase $|\sin \phi_{\mu}| > 0.01$ and Higgsino and gaugino mass
parameters $|\mu| \simeq M_2$, and of the order of the electroweak scale, are
necessary in order to generate the observed baryon asymmetry.
| [
{
"created": "Mon, 24 Feb 1997 20:22:10 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Carena",
"M.",
""
],
[
"Quiros",
"M.",
""
],
[
"Riotto",
"A.",
""
],
[
"Vilja",
"I.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] | Electroweak baryogenesis is an interesting theoretical scenario, which demands physics beyond the Standard Model at energy scales of the order of the weak boson masses. It has been recently emphasized that, in the presence of light stops, the electroweak phase transition can be strongly first order, opening the window for electroweak baryogenesis in the MSSM. For the realization of this scenario, the Higgs boson must be light, at the reach of the LEP2 collider. In this article, we compute the baryon asymmetry assuming the presence of non-trivial CP violating phases in the parameters associated with the left-right stop mixing term and the Higgsino mass $\mu$. We conclude that a phase $|\sin \phi_{\mu}| > 0.01$ and Higgsino and gaugino mass parameters $|\mu| \simeq M_2$, and of the order of the electroweak scale, are necessary in order to generate the observed baryon asymmetry. |
2305.19038 | Qiaoyi Wen | Qiaoyi Wen and Fanrong Xu | The Global Fits of New Physics in $b \to s $ after $R_{K^{(*)}}$ 2022
Release | (37 pages, 28 figures (references added, figures modified, Appendices
revised; the version accepted by PRD.) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The measurement of lepton universality parameters $R_{K^{(*)}}$ was updated
by LHCb in December 2022, which indicated that the well-known anomalies in
flavor-changing neutral current (FCNC) processes of B meson decays have faded
away. However, does this mean that all new physics possibilities related to
$b\to s\ell^+\ell^-$ have been excluded? We aim to answer this question in this
work. The state-of-the-art effective Hamiltonian is adopted to describe $b \to
s$ transition, while BSM (beyond the Standard Model) new physics effects are
encoded in Wilson coefficients (WCs). Using around 200 observables in leptonic
and semileptonic decays of B mesons and bottom baryons, measured by LHCb, CMS,
ATLAS, Belle, and BaBar, we perform global fits of these Wilson coefficients in
four different scenarios. In particular, lepton flavors in WCs are specified in
some of the working scenarios. To see the change of new physics parameters, we
use both the data before and after the 2022 release of $R_{K^{(*)}}$ in two
separate sets of fits. We find that in three of the four scenarios, $\Delta
C_9^\mu$ still has a deviation around or more than $4\sigma$ from the Standard
Model. The lepton flavor in WCs is distinguishable for $\Delta C_{9}$ at the
$1\sigma$ level, but at the $2\sigma$ level all the operators are flavor
identical. We demonstrate numerically that there is no chirality for muon type
of scalar operator and it is kept at the $1\sigma$ level for their electron
type dual ones, while chiral difference exists for $\mathcal{O}_{9}^\mu$ at
least at the $2\sigma$ level. Moreover, it can be deduced that the scalar
operators $\mathcal{O}_{S,P}^{(')\mu}$ become null if new physics emerges in
terms of SMEFT (Standard Model Effective Field Theory) up to dimension-6.
| [
{
"created": "Tue, 30 May 2023 13:56:26 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2023 01:33:44 GMT",
"version": "v2"
},
{
"created": "Sun, 29 Oct 2023 07:01:25 GMT",
"version": "v3"
}
] | 2023-10-31 | [
[
"Wen",
"Qiaoyi",
""
],
[
"Xu",
"Fanrong",
""
]
] | The measurement of lepton universality parameters $R_{K^{(*)}}$ was updated by LHCb in December 2022, which indicated that the well-known anomalies in flavor-changing neutral current (FCNC) processes of B meson decays have faded away. However, does this mean that all new physics possibilities related to $b\to s\ell^+\ell^-$ have been excluded? We aim to answer this question in this work. The state-of-the-art effective Hamiltonian is adopted to describe $b \to s$ transition, while BSM (beyond the Standard Model) new physics effects are encoded in Wilson coefficients (WCs). Using around 200 observables in leptonic and semileptonic decays of B mesons and bottom baryons, measured by LHCb, CMS, ATLAS, Belle, and BaBar, we perform global fits of these Wilson coefficients in four different scenarios. In particular, lepton flavors in WCs are specified in some of the working scenarios. To see the change of new physics parameters, we use both the data before and after the 2022 release of $R_{K^{(*)}}$ in two separate sets of fits. We find that in three of the four scenarios, $\Delta C_9^\mu$ still has a deviation around or more than $4\sigma$ from the Standard Model. The lepton flavor in WCs is distinguishable for $\Delta C_{9}$ at the $1\sigma$ level, but at the $2\sigma$ level all the operators are flavor identical. We demonstrate numerically that there is no chirality for muon type of scalar operator and it is kept at the $1\sigma$ level for their electron type dual ones, while chiral difference exists for $\mathcal{O}_{9}^\mu$ at least at the $2\sigma$ level. Moreover, it can be deduced that the scalar operators $\mathcal{O}_{S,P}^{(')\mu}$ become null if new physics emerges in terms of SMEFT (Standard Model Effective Field Theory) up to dimension-6. |
hep-ph/0605171 | Joern Kersten | Joern Kersten | Squarks and Sleptons between Branes and Bulk - Gaugino Mediation and
Gravitino Dark Matter in an SO(10) Orbifold GUT | Approximately 6 pages; yet another contribution to the proceedings of
the XLIst Rencontres de Moriond, March 11-18, 2006, La Thuile, Italy | null | null | DESY 06-067 | hep-ph | null | We study gaugino-mediated supersymmetry breaking in a six-dimensional SO(10)
orbifold GUT model where quarks and leptons are mixtures of brane and bulk
fields. The couplings of bulk matter fields to the supersymmetry breaking brane
field have to be suppressed in order to avoid large FCNCs. We derive bounds on
the soft supersymmetry breaking parameters and calculate the superparticle mass
spectrum. If the gravitino is the LSP, the stau_1 or the tau sneutrino turns
out to be the NLSP, with characteristic signatures at future colliders and in
cosmology.
| [
{
"created": "Mon, 15 May 2006 15:51:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kersten",
"Joern",
""
]
] | We study gaugino-mediated supersymmetry breaking in a six-dimensional SO(10) orbifold GUT model where quarks and leptons are mixtures of brane and bulk fields. The couplings of bulk matter fields to the supersymmetry breaking brane field have to be suppressed in order to avoid large FCNCs. We derive bounds on the soft supersymmetry breaking parameters and calculate the superparticle mass spectrum. If the gravitino is the LSP, the stau_1 or the tau sneutrino turns out to be the NLSP, with characteristic signatures at future colliders and in cosmology. |
2111.12185 | Luigi Delle Rose | Luigi Delle Rose, Shaaban Khalil, Stefano Moretti | The muon $g-2$ in an Aligned 2-Higgs Doublet Model with Right-Handed
Neutrinos | 6 pages, 3 figures, contribution to the proceedings of the Charged
Higgs Online workshop | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, we show how one can attribute the anomaly currently present in
the measurement of the anomalous magnetic moment of the muon ($a_\mu$) to the
presence of an underlying Aligned 2-Higgs Doublet Model (A2HDM) with
Right-Handed (RH) neutrinos, $\nu_R$. The effects of the latter scenario are
driven by one and two-loop topologies wherein a very light CP-odd neutral Higgs
state ($A$) contributes significantly to $a_\mu$. Over the region of parameter
space of our new physics model which explains the aforementioned anomaly, also
consistent with the most recent measurements of the electron anomalous magnetic
moment ($a_e$), wherein the charged Higgs state $H^\pm$ plays a similar role,
we predict an almost background-free hallmark signature of it, due to $H^\pm A$
production followed by Higgs boson decays yielding multi-$\tau$ final states,
which can be already be searched for at the Large Hadron Collider (LHC).
| [
{
"created": "Tue, 23 Nov 2021 22:46:53 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jan 2022 10:33:30 GMT",
"version": "v2"
}
] | 2022-01-25 | [
[
"Rose",
"Luigi Delle",
""
],
[
"Khalil",
"Shaaban",
""
],
[
"Moretti",
"Stefano",
""
]
] | In this note, we show how one can attribute the anomaly currently present in the measurement of the anomalous magnetic moment of the muon ($a_\mu$) to the presence of an underlying Aligned 2-Higgs Doublet Model (A2HDM) with Right-Handed (RH) neutrinos, $\nu_R$. The effects of the latter scenario are driven by one and two-loop topologies wherein a very light CP-odd neutral Higgs state ($A$) contributes significantly to $a_\mu$. Over the region of parameter space of our new physics model which explains the aforementioned anomaly, also consistent with the most recent measurements of the electron anomalous magnetic moment ($a_e$), wherein the charged Higgs state $H^\pm$ plays a similar role, we predict an almost background-free hallmark signature of it, due to $H^\pm A$ production followed by Higgs boson decays yielding multi-$\tau$ final states, which can be already be searched for at the Large Hadron Collider (LHC). |
2202.11661 | Vivek Tiwari Kumar | Suraj Kumar Rai and Vivek Kumar Tiwari | On-shell versus curvature mass parameter fixing schemes in the
quark-meson model and its phase diagrams | 18 pages, 11 figures | null | 10.1103/PhysRevD.105.094010 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We compute and compare the effective potential and phase structure for the
quark-meson model in an extended mean-field approximation (e-MFA) when vacuum
one loop quark fluctuations are included and the model parameters are fixed
using different renormalization prescriptions.When the quark one loop vacuum
divergence is regularized under the minimal subtraction scheme,the model
setting of the parameter fixing using the curvature masses of the scalar and
pseudo-scalar mesons, has been termed as the quark-meson model with the vacuum
term(QMVT).However,this prescription becomes inconsistent when we notice that
the curvature mass is akin to defining the meson mass by the self-energy
evaluation at vanishing momentum.In this work,we apply the recently reported
exact prescription of the on-shell parameter fixing,to that version of
quark-meson (QM) model where the two quark flavors are coupled to the eight
mesons of the $ SU(2)_{L} \times SU(2)_{R} $ linear sigma model with
iso-singlet $ \sigma $ ($\eta$),iso-triplet $ \vec{a_{0}} $ ($ \vec{\pi} $)
scalar(pseudo-scalar) mesons.The model then becomes, the renormalized
quark-meson (RQM) model where physical (pole) masses of mesons and pion decay
constant, are put into the relation of the running mass parameter and couplings
by using the on-shell and the minimal subtraction renormalization schemes.The
vacuum effective potential plots,the phase diagrams and the order parameter
temperature variations for both the RQM model and QMVT model,are exactly
identical for the $m_\sigma=$616 MeV.The effective potential is deepest in the
QMVT model for $m_\sigma < $ 616 MeV and it becomes deepest in the RQM model
when $m_\sigma > $616 MeV.
| [
{
"created": "Wed, 23 Feb 2022 18:09:09 GMT",
"version": "v1"
}
] | 2022-05-25 | [
[
"Rai",
"Suraj Kumar",
""
],
[
"Tiwari",
"Vivek Kumar",
""
]
] | We compute and compare the effective potential and phase structure for the quark-meson model in an extended mean-field approximation (e-MFA) when vacuum one loop quark fluctuations are included and the model parameters are fixed using different renormalization prescriptions.When the quark one loop vacuum divergence is regularized under the minimal subtraction scheme,the model setting of the parameter fixing using the curvature masses of the scalar and pseudo-scalar mesons, has been termed as the quark-meson model with the vacuum term(QMVT).However,this prescription becomes inconsistent when we notice that the curvature mass is akin to defining the meson mass by the self-energy evaluation at vanishing momentum.In this work,we apply the recently reported exact prescription of the on-shell parameter fixing,to that version of quark-meson (QM) model where the two quark flavors are coupled to the eight mesons of the $ SU(2)_{L} \times SU(2)_{R} $ linear sigma model with iso-singlet $ \sigma $ ($\eta$),iso-triplet $ \vec{a_{0}} $ ($ \vec{\pi} $) scalar(pseudo-scalar) mesons.The model then becomes, the renormalized quark-meson (RQM) model where physical (pole) masses of mesons and pion decay constant, are put into the relation of the running mass parameter and couplings by using the on-shell and the minimal subtraction renormalization schemes.The vacuum effective potential plots,the phase diagrams and the order parameter temperature variations for both the RQM model and QMVT model,are exactly identical for the $m_\sigma=$616 MeV.The effective potential is deepest in the QMVT model for $m_\sigma < $ 616 MeV and it becomes deepest in the RQM model when $m_\sigma > $616 MeV. |
2303.08072 | Li-Ping He | Eric Braaten, Li-Ping He, Kevin Ingles, Jun Jiang | Thermal Energy of a Charm-meson Molecule in a Pion Gas | 39 pages, 11 figures, 2 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermal corrections to the propagator of a loosely bound charm-meson
molecule in a pion gas are calculated to next-to-leading order in the
heavy-meson expansion using a zero-range effective field theory. Ultraviolet
divergences in the charm-meson-pair self energy are canceled by corrections to
the charm-meson-pair contact vertex. Terms that are singular at the
charm-meson-pair threshold can be absorbed into thermal corrections to the rest
energies and kinetic masses of the charm-meson constituents. The remaining
terms reduce to a thermal correction to the binding momentum that is
proportional to the pion number density and suppressed by the pion/charm-meson
mass ratio. The correction gives a tiny decrease in the binding energy of the
charm-meson molecule relative to the charm-meson-pair threshold in the pion gas
and a change in its thermal width that is small compared to the thermal widths
of the charm-meson constituents. These results are encouraging for the
prospects of observing $X(3872)$ and $T_{cc}^+(3875)$ in the expanding hadron
gas produced by heavy-ion collisions.
| [
{
"created": "Tue, 14 Mar 2023 17:05:35 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2023 20:20:58 GMT",
"version": "v2"
}
] | 2023-09-13 | [
[
"Braaten",
"Eric",
""
],
[
"He",
"Li-Ping",
""
],
[
"Ingles",
"Kevin",
""
],
[
"Jiang",
"Jun",
""
]
] | The thermal corrections to the propagator of a loosely bound charm-meson molecule in a pion gas are calculated to next-to-leading order in the heavy-meson expansion using a zero-range effective field theory. Ultraviolet divergences in the charm-meson-pair self energy are canceled by corrections to the charm-meson-pair contact vertex. Terms that are singular at the charm-meson-pair threshold can be absorbed into thermal corrections to the rest energies and kinetic masses of the charm-meson constituents. The remaining terms reduce to a thermal correction to the binding momentum that is proportional to the pion number density and suppressed by the pion/charm-meson mass ratio. The correction gives a tiny decrease in the binding energy of the charm-meson molecule relative to the charm-meson-pair threshold in the pion gas and a change in its thermal width that is small compared to the thermal widths of the charm-meson constituents. These results are encouraging for the prospects of observing $X(3872)$ and $T_{cc}^+(3875)$ in the expanding hadron gas produced by heavy-ion collisions. |
0812.4409 | George Sterman | George Sterman | Leading and Non-leading Singularities in Gauge Theory Hard Scattering | 16 pages, 5 figures, based on a talk presented at Continuous Advances
in QCD; William I. Fine Theoretical Physics Institute, University of
Minnesota, May 15-18, 2008 | null | 10.1142/9789812838667_0003 | YITP-SB-08-38 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This talk reviewed some classic results and recent progress in the
resummation of leading and nonleading enhancements in QCD cross sections and of
poles in dimensionally-regularized hard-scattering amplitudes.
| [
{
"created": "Tue, 23 Dec 2008 15:53:13 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Sterman",
"George",
""
]
] | This talk reviewed some classic results and recent progress in the resummation of leading and nonleading enhancements in QCD cross sections and of poles in dimensionally-regularized hard-scattering amplitudes. |
2103.13403 | Manimala Chakraborti | Manimala Chakraborti, Sven Heinemeyer and Ipsita Saha | Improved $(g-2)_\mu$ Measurements and Wino/Higgsino Dark Matter | 44 pages, 22 figures, follow-up of arXiv:2006.15157 | null | 10.1140/epjc/s10052-021-09814-1 | IFT--UAM/CSIC--21-022, IPMU21-020 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electroweak (EW) sector of the Minimal Supersymmetric Standard Model
(MSSM) can account for a variety of experimental data. In particular, it can
explain the persistent 3-4 sigma discrepancy between the experimental result
for the anomalous magnetic moment of the muon and its Standard Model (SM)
prediction. The lightest supersymmetric particle (LSP), which we take as the
lightest neutralino, can furthermore account for the observed Dark Matter (DM)
content of the universe via coannihilation with the next-to-LSP (NLSP), while
being in agreement with negative results from Direct Detection (DD)
experiments. Concerning the unsuccessful searches for EW superparticles at the
LHC, owing to relatively small production cross-sections, a comparably light EW
sector of the MSSM is in full agreement with the experimental data. The DM
relic density can fully be explained by a mixed bino/wino LSP. Here we take the
relic density as an upper bound, which opens up the possibility of wino and
higgsino DM. We first analyze which mass ranges of neutralinos, charginos and
scalar leptons are in agreement with all experimental data, including relevant
LHC searches. We find roughly an upper limit of ~ 600 GeV for the LSP and NLSP
masses. In a second step we assume that the new result of the Run 1 of the
'MUON G-2' collaboration at Fermilab yields a precision comparable to the
existing experimental result with the same central value. We analyze the
potential impact of the combination of the Run 1 data with the existing muon
g-2 data on the allowed MSSM parameter space. We find that in this case the
upper limits on the LSP and NLSP masses are substantially reduced by roughly
100 GeV. We interpret these upper bounds in view of future HL-LHC EW searches
as well as future high-energy electron-positron colliders, such as the ILC or
CLIC.
| [
{
"created": "Wed, 24 Mar 2021 18:00:05 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Chakraborti",
"Manimala",
""
],
[
"Heinemeyer",
"Sven",
""
],
[
"Saha",
"Ipsita",
""
]
] | The electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM) can account for a variety of experimental data. In particular, it can explain the persistent 3-4 sigma discrepancy between the experimental result for the anomalous magnetic moment of the muon and its Standard Model (SM) prediction. The lightest supersymmetric particle (LSP), which we take as the lightest neutralino, can furthermore account for the observed Dark Matter (DM) content of the universe via coannihilation with the next-to-LSP (NLSP), while being in agreement with negative results from Direct Detection (DD) experiments. Concerning the unsuccessful searches for EW superparticles at the LHC, owing to relatively small production cross-sections, a comparably light EW sector of the MSSM is in full agreement with the experimental data. The DM relic density can fully be explained by a mixed bino/wino LSP. Here we take the relic density as an upper bound, which opens up the possibility of wino and higgsino DM. We first analyze which mass ranges of neutralinos, charginos and scalar leptons are in agreement with all experimental data, including relevant LHC searches. We find roughly an upper limit of ~ 600 GeV for the LSP and NLSP masses. In a second step we assume that the new result of the Run 1 of the 'MUON G-2' collaboration at Fermilab yields a precision comparable to the existing experimental result with the same central value. We analyze the potential impact of the combination of the Run 1 data with the existing muon g-2 data on the allowed MSSM parameter space. We find that in this case the upper limits on the LSP and NLSP masses are substantially reduced by roughly 100 GeV. We interpret these upper bounds in view of future HL-LHC EW searches as well as future high-energy electron-positron colliders, such as the ILC or CLIC. |
hep-ph/0109092 | Richard Nisius | Kenneth Long, Richard Nisius and W. James Stirling | Summary of the Structure Function Session at Dis01 | Invited talk presented at the 9th International Workshop on Deep
Inelastic Scattering (DIS 2001), Bologna, Italy, 27 Apr - 1 May 2001, to
appear in the Proceedings. (30 pages, 17 figures) | null | 10.1142/9789812778345_0015 | null | hep-ph | null | The status and ongoing developments in the field of deep inelastic scattering
presented at the DIS01 workshop in Bologna are discussed from both the
experimental and the theoretical perspective.
| [
{
"created": "Tue, 11 Sep 2001 09:03:33 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Long",
"Kenneth",
""
],
[
"Nisius",
"Richard",
""
],
[
"Stirling",
"W. James",
""
]
] | The status and ongoing developments in the field of deep inelastic scattering presented at the DIS01 workshop in Bologna are discussed from both the experimental and the theoretical perspective. |
2002.04615 | Kai Schmitz | Kai Schmitz | New Sensitivity Curves for Gravitational-Wave Signals from Cosmological
Phase Transitions | 30+14+12 pages main text / appendix / references, 12 figures, 4
tables. Companion paper: 1909.11356. Numerical results available on Zenodo:
https://doi.org/10.5281/zenodo.3689582. v3: new title, new section (3.6) on
how to update PISC plots, matches version published in JHEP | JHEP 01 (2021) 097 | 10.1007/JHEP01(2021)097 | CERN-TH-2020-018 | hep-ph astro-ph.CO gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves (GWs) from strong first-order phase transitions (SFOPTs)
in the early Universe are a prime target for upcoming GW experiments. In this
paper, I construct novel peak-integrated sensitivity curves (PISCs) for these
experiments, which faithfully represent their projected sensitivities to the GW
signal from a cosmological SFOPT by explicitly taking into account the expected
shape of the signal. Designed to be a handy tool for phenomenologists and model
builders, PISCs allow for a quick and systematic comparison of theoretical
predictions with experimental sensitivities, as I illustrate by a large range
of examples. PISCs also offer several advantages over the conventional
power-law-integrated sensitivity curves (PLISCs); in particular, they directly
encode information on the expected signal-to-noise ratio for the GW signal from
a SFOPT. I provide semianalytical fit functions for the exact numerical PISCs
of LISA, DECIGO, and BBO. In an appendix, I moreover present a detailed review
of the strain noise power spectra of a large number of GW experiments. The
numerical results for all PISCs, PLISCs, and strain noise power spectra
presented in this paper can be downloaded from the Zenodo online repository
[https://doi.org/10.5281/zenodo.3689582]. In a companion paper [1909.11356],
the concept of PISCs is used to perform an in-depth study of the GW signal from
the cosmological phase transition in the real-scalar-singlet extension of the
standard model. The PISCs presented in this paper will need to be updated
whenever new theoretical results on the expected shape of the signal become
available. The PISC approach is therefore suited to be used as a bookkeeping
tool to keep track of the theoretical progress in the field.
| [
{
"created": "Tue, 11 Feb 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Feb 2020 17:11:08 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jan 2021 08:21:53 GMT",
"version": "v3"
}
] | 2021-01-29 | [
[
"Schmitz",
"Kai",
""
]
] | Gravitational waves (GWs) from strong first-order phase transitions (SFOPTs) in the early Universe are a prime target for upcoming GW experiments. In this paper, I construct novel peak-integrated sensitivity curves (PISCs) for these experiments, which faithfully represent their projected sensitivities to the GW signal from a cosmological SFOPT by explicitly taking into account the expected shape of the signal. Designed to be a handy tool for phenomenologists and model builders, PISCs allow for a quick and systematic comparison of theoretical predictions with experimental sensitivities, as I illustrate by a large range of examples. PISCs also offer several advantages over the conventional power-law-integrated sensitivity curves (PLISCs); in particular, they directly encode information on the expected signal-to-noise ratio for the GW signal from a SFOPT. I provide semianalytical fit functions for the exact numerical PISCs of LISA, DECIGO, and BBO. In an appendix, I moreover present a detailed review of the strain noise power spectra of a large number of GW experiments. The numerical results for all PISCs, PLISCs, and strain noise power spectra presented in this paper can be downloaded from the Zenodo online repository [https://doi.org/10.5281/zenodo.3689582]. In a companion paper [1909.11356], the concept of PISCs is used to perform an in-depth study of the GW signal from the cosmological phase transition in the real-scalar-singlet extension of the standard model. The PISCs presented in this paper will need to be updated whenever new theoretical results on the expected shape of the signal become available. The PISC approach is therefore suited to be used as a bookkeeping tool to keep track of the theoretical progress in the field. |
2009.03480 | Yan-Bing Wei | Yue-Long Shen, Yan-Bing Wei, Xue-Chen Zhao, Si-Hong Zhou | Revisiting radiative leptonic $B$ decay | 15 pages, 4 figures | null | 10.1088/1674-1137/abb6df | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we summarize the existing methods of solving the evolution
equation of the leading-twist $B$-meson LCDA. Then, in the Mellin space, we
derive a factorization formula with next-to-leading-logarithmic (NLL)
resummation for the form factors $F_{A,V}$ in the $B \to \gamma \ell\nu$ decay
at leading power in $\Lambda/m_b$. Furthermore, we investigate the power
suppressed local contributions, factorizable non-local contributions (which are
suppressed by $1/E_\gamma$ and $1/m_b$), and soft contributions to the form
factors. In the numerical analysis, which employs the two-loop-level hard
function and the jet function, we find that both the resummation effect and the
power corrections can sizably decrease the form factors. Finally, the
integrated branching ratios are also calculated for comparison with future
experimental data.
| [
{
"created": "Tue, 8 Sep 2020 01:55:10 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2021 07:21:13 GMT",
"version": "v2"
}
] | 2021-04-20 | [
[
"Shen",
"Yue-Long",
""
],
[
"Wei",
"Yan-Bing",
""
],
[
"Zhao",
"Xue-Chen",
""
],
[
"Zhou",
"Si-Hong",
""
]
] | In this paper, we summarize the existing methods of solving the evolution equation of the leading-twist $B$-meson LCDA. Then, in the Mellin space, we derive a factorization formula with next-to-leading-logarithmic (NLL) resummation for the form factors $F_{A,V}$ in the $B \to \gamma \ell\nu$ decay at leading power in $\Lambda/m_b$. Furthermore, we investigate the power suppressed local contributions, factorizable non-local contributions (which are suppressed by $1/E_\gamma$ and $1/m_b$), and soft contributions to the form factors. In the numerical analysis, which employs the two-loop-level hard function and the jet function, we find that both the resummation effect and the power corrections can sizably decrease the form factors. Finally, the integrated branching ratios are also calculated for comparison with future experimental data. |
1510.00725 | Jordy Vries de | Y.-T. Chien, V. Cirigliano, W. Dekens, J. de Vries, and E. Mereghetti | Direct and indirect constraints on CP-violating Higgs-quark and
Higgs-gluon interactions | Included analysis of Higgs decay processes. References added | JHEP 1602 (2016) 011 | 10.1007/JHEP02(2016)011 | LA-UR-15-27548 | hep-ph hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate direct and indirect constraints on the complete set of
anomalous CP-violating Higgs couplings to quarks and gluons originating from
dimension-6 operators, by studying their signatures at the LHC and in electric
dipole moments (EDMs). We show that existing uncertainties in hadronic and
nuclear matrix elements have a significant impact on the interpretation of EDM
experiments, and we quantify the improvements needed to fully exploit the power
of EDM searches. Currently, the best bounds on the anomalous CP-violating Higgs
interactions come from a combination of EDM measurements and the data from LHC
Run 1. We argue that Higgs production cross section and branching ratios
measurements at the LHC Run 2 will not improve the constraints significantly.
On the other hand, the bounds on the couplings scale roughly linearly with EDM
limits, so that future theoretical and experimental EDM developments can have a
major impact in pinning down interactions of the Higgs.
| [
{
"created": "Fri, 2 Oct 2015 20:13:41 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jan 2016 09:41:10 GMT",
"version": "v2"
}
] | 2016-02-09 | [
[
"Chien",
"Y. -T.",
""
],
[
"Cirigliano",
"V.",
""
],
[
"Dekens",
"W.",
""
],
[
"de Vries",
"J.",
""
],
[
"Mereghetti",
"E.",
""
]
] | We investigate direct and indirect constraints on the complete set of anomalous CP-violating Higgs couplings to quarks and gluons originating from dimension-6 operators, by studying their signatures at the LHC and in electric dipole moments (EDMs). We show that existing uncertainties in hadronic and nuclear matrix elements have a significant impact on the interpretation of EDM experiments, and we quantify the improvements needed to fully exploit the power of EDM searches. Currently, the best bounds on the anomalous CP-violating Higgs interactions come from a combination of EDM measurements and the data from LHC Run 1. We argue that Higgs production cross section and branching ratios measurements at the LHC Run 2 will not improve the constraints significantly. On the other hand, the bounds on the couplings scale roughly linearly with EDM limits, so that future theoretical and experimental EDM developments can have a major impact in pinning down interactions of the Higgs. |
1006.2594 | Jin Min Yang | Jin Min Yang | Lepton flavor violating Z-boson decays at GigaZ as a probe of
supersymmetry | A mini review for the special issue 'Z-factory (GigaZ)' of Sci. China
G | Sci.China G53:1949-1952,2010 | 10.1007/s11433-010-4146-3 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly review the lepton flavor violating Z-decays at GigaZ as a probe of
supersymmetry by focusing on $Z \to \ell_i \overline{\ell}_j$ in two
representative supersymmetric models: the minimal supersymmetric model without
R-parity and the supersymmetric seesaw model. We conclude that under the
current experimental constraints from LEP and $\ell_i\to \ell_j \gamma$, these
rare decays can still be enhanced to reach the sensitivity of the GigaZ.
Therefore, supersymmetry can be probed via these decays at GigaZ.
| [
{
"created": "Mon, 14 Jun 2010 03:46:41 GMT",
"version": "v1"
}
] | 2011-08-19 | [
[
"Yang",
"Jin Min",
""
]
] | We briefly review the lepton flavor violating Z-decays at GigaZ as a probe of supersymmetry by focusing on $Z \to \ell_i \overline{\ell}_j$ in two representative supersymmetric models: the minimal supersymmetric model without R-parity and the supersymmetric seesaw model. We conclude that under the current experimental constraints from LEP and $\ell_i\to \ell_j \gamma$, these rare decays can still be enhanced to reach the sensitivity of the GigaZ. Therefore, supersymmetry can be probed via these decays at GigaZ. |
hep-ph/0007356 | Yasuo Umino | Yasuo Umino | Diagonalization of the strongly coupled lattice QCD Hamiltonian | 14 pages, 2 figures | Phys.Lett. B492 (2000) 385-392 | 10.1016/S0370-2693(00)01096-0 | IFIC-00-43 | hep-ph hep-lat hep-th nucl-th | null | We construct a solution to the equation of motion of Hamiltonian lattice QCD
in the strong coupling limit using Wilson fermions which exactly diagonalizes
the Hamiltonian to second order in the field operators. This solution obeys the
free lattice Dirac equation with a dynamical mass which is identified with the
gap. The equation determining this gap is derived and it is found that the
dynamical quark mass is a constant to lowest order in N_c but becomes momentum
dependent once 1/N_c corrections are taken into account. We interpret our
solution within the framework of the N-quantum approach to quantum field theory
and discuss how our formalism may be systematically extended to study bound
states at finite temperature and chemical potential.
| [
{
"created": "Mon, 31 Jul 2000 14:08:13 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 2000 18:28:49 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Umino",
"Yasuo",
""
]
] | We construct a solution to the equation of motion of Hamiltonian lattice QCD in the strong coupling limit using Wilson fermions which exactly diagonalizes the Hamiltonian to second order in the field operators. This solution obeys the free lattice Dirac equation with a dynamical mass which is identified with the gap. The equation determining this gap is derived and it is found that the dynamical quark mass is a constant to lowest order in N_c but becomes momentum dependent once 1/N_c corrections are taken into account. We interpret our solution within the framework of the N-quantum approach to quantum field theory and discuss how our formalism may be systematically extended to study bound states at finite temperature and chemical potential. |
1106.2453 | David d'Enterria | David d'Enterria, Ralph Engel, Tanguy Pierog, Sergey Ostapchenko,
Klaus Werner | The strong interaction at the collider and cosmic-rays frontiers | 7 pages, Proceeds. Workshop "30 years of strong interactions", Spa,
Belgium, 6-8 April 2011. Elsevier to appear | null | 10.1007/s00601-011-0255-4 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First data on inclusive particle production measured in proton-proton
collisions at the Large Hadron Collider (LHC) are compared to predictions of
various hadron-interaction Monte Carlos (QGSJET, EPOS and SIBYLL) used commonly
in high-energy cosmic-ray physics. While reasonable overall agreement is found
for some of the models, none of them reproduces consistently the sqrt(s)
evolution of all the measured observables. We discuss the implications of the
new LHC data for the modeling of the non-perturbative and semihard parton
dynamics in hadron-hadron and cosmic-rays interactions at the highest energies
studied today.
| [
{
"created": "Mon, 13 Jun 2011 14:44:02 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"d'Enterria",
"David",
""
],
[
"Engel",
"Ralph",
""
],
[
"Pierog",
"Tanguy",
""
],
[
"Ostapchenko",
"Sergey",
""
],
[
"Werner",
"Klaus",
""
]
] | First data on inclusive particle production measured in proton-proton collisions at the Large Hadron Collider (LHC) are compared to predictions of various hadron-interaction Monte Carlos (QGSJET, EPOS and SIBYLL) used commonly in high-energy cosmic-ray physics. While reasonable overall agreement is found for some of the models, none of them reproduces consistently the sqrt(s) evolution of all the measured observables. We discuss the implications of the new LHC data for the modeling of the non-perturbative and semihard parton dynamics in hadron-hadron and cosmic-rays interactions at the highest energies studied today. |
1510.03182 | Vassilis Spanos | Helmut Eberl, Vassilis C. Spanos | GravitinoPack and late decays involving gravitinos | 9 pages, 5 figures, Proceedings of the 18th International Conference
From the Planck Scale to the Electroweak Scale, PLANCK-2015, 25-29 May 2015,
Ioannina, Greece | PoS (PLANCK 2015) 124 | null | HEPHY-PUB 960/15 | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, we present the package GravitinoPack that calculates decays of
unstable supersymmetric particles, involving gravitinos in the final or initial
state. If the gravitino is the dark matter particle and therefore stable, the
package calculates the decays of the lightest neutralino, and the lighter stau
or stop NLSP into the gravitino LSP and one or two Standard Model particles. On
the other hand, assuming that the gravitino is unstable, GravitinoPack
calculates all its two-body and the three-body decay widths to the neutralino
LSP and Standard Model particles. Since all these decays, involving the
gravitino, are of gravitational nature, the lifetime of the decaying particle
can be of the order of seconds are more, hence called "late decays". The
precise knowledge of all these partial decay widths enables the user to apply
accurately the relevant cosmological constraints.
| [
{
"created": "Mon, 12 Oct 2015 08:38:27 GMT",
"version": "v1"
}
] | 2015-10-13 | [
[
"Eberl",
"Helmut",
""
],
[
"Spanos",
"Vassilis C.",
""
]
] | In this talk, we present the package GravitinoPack that calculates decays of unstable supersymmetric particles, involving gravitinos in the final or initial state. If the gravitino is the dark matter particle and therefore stable, the package calculates the decays of the lightest neutralino, and the lighter stau or stop NLSP into the gravitino LSP and one or two Standard Model particles. On the other hand, assuming that the gravitino is unstable, GravitinoPack calculates all its two-body and the three-body decay widths to the neutralino LSP and Standard Model particles. Since all these decays, involving the gravitino, are of gravitational nature, the lifetime of the decaying particle can be of the order of seconds are more, hence called "late decays". The precise knowledge of all these partial decay widths enables the user to apply accurately the relevant cosmological constraints. |
1712.10270 | Oscar Cata | Luigi Cappiello, Oscar Cata and Giancarlo D'Ambrosio | Closing in on the radiative weak chiral couplings | 14 pages, 4 figures | null | 10.1140/epjc/s10052-018-5748-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that, given the current experimental status of radiative kaon
decays, a subclass of the ${\cal O} (p^4)$ counterterms of the weak chiral
lagrangian can be determined in closed form. This involves in a decisive way
the decay $K^\pm \to \pi ^\pm \pi ^0 l^+ l^-$, currently being measured at CERN
by the NA48/2 and NA62 collaborations. We show that consistency with other
radiative kaon decay measurements leads to a rather clean prediction for the
${\cal{O}}(p^4)$ weak couplings entering this decay mode. This results in a
characteristic pattern for the interference Dalitz plot, susceptible to be
tested already with the limited statistics available at NA48/2. We also provide
the first analysis of $K_S\to \pi^+\pi^-\gamma^*$, which will be measured by
LHCb and will help reduce (together with the related $K_L$ decay) the
experimental uncertainty on the radiative weak chiral couplings. A precise
experimental determination of the ${\cal{O}}(p^4)$ weak couplings is important
in order to assess the validity of the existing theoretical models in a
conclusive way. We briefly comment on the current theoretical situation and
discuss the merits of the different theoretical approaches.
| [
{
"created": "Fri, 29 Dec 2017 16:31:11 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Cappiello",
"Luigi",
""
],
[
"Cata",
"Oscar",
""
],
[
"D'Ambrosio",
"Giancarlo",
""
]
] | We point out that, given the current experimental status of radiative kaon decays, a subclass of the ${\cal O} (p^4)$ counterterms of the weak chiral lagrangian can be determined in closed form. This involves in a decisive way the decay $K^\pm \to \pi ^\pm \pi ^0 l^+ l^-$, currently being measured at CERN by the NA48/2 and NA62 collaborations. We show that consistency with other radiative kaon decay measurements leads to a rather clean prediction for the ${\cal{O}}(p^4)$ weak couplings entering this decay mode. This results in a characteristic pattern for the interference Dalitz plot, susceptible to be tested already with the limited statistics available at NA48/2. We also provide the first analysis of $K_S\to \pi^+\pi^-\gamma^*$, which will be measured by LHCb and will help reduce (together with the related $K_L$ decay) the experimental uncertainty on the radiative weak chiral couplings. A precise experimental determination of the ${\cal{O}}(p^4)$ weak couplings is important in order to assess the validity of the existing theoretical models in a conclusive way. We briefly comment on the current theoretical situation and discuss the merits of the different theoretical approaches. |
hep-ph/0004143 | Lance Dixon | Travis Brooks and Lance Dixon | Recalculation of Proton Compton Scattering in Perturbative QCD | Latex, 23 pages, 13 figures. Checked numerical integration one more
way; added results for one more proton distribution amplitude; a few other
minor changes. Version to appear in Phys. Rev. D | Phys.Rev.D62:114021,2000 | 10.1103/PhysRevD.62.114021 | SLAC-PUB-8435 | hep-ph | null | At very high energy and wide angles, Compton scattering on the proton (gamma
p -> gamma p) is described by perturbative QCD. The perturbative QCD
calculation has been performed several times previously, at leading twist and
at leading order in alpha_s, with mutually inconsistent results, even when the
same light-cone distribution amplitudes have been employed. We have
recalculated the helicity amplitudes for this process, using contour
deformations to evaluate the singular integrals over the light-cone momentum
fractions. We do not obtain complete agreement with any previous result. Our
results are closest to those of the most recent previous computation, differing
significantly for just one of the three independent helicity amplitudes, and
only for backward scattering angles. We present results for the unpolarized
cross section, and for three different polarization asymmetries. We compare the
perturbative QCD predictions for these observables with those of the handbag
and diquark models. In order to reduce uncertainties associated with alpha_s
and the three-quark wave function normalization, we have normalized the Compton
cross section using the proton elastic form factor. The theoretical predictions
for this ratio are about an order of magnitude below existing experimental
data.
| [
{
"created": "Sat, 15 Apr 2000 01:01:08 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2000 22:10:11 GMT",
"version": "v2"
}
] | 2009-05-01 | [
[
"Brooks",
"Travis",
""
],
[
"Dixon",
"Lance",
""
]
] | At very high energy and wide angles, Compton scattering on the proton (gamma p -> gamma p) is described by perturbative QCD. The perturbative QCD calculation has been performed several times previously, at leading twist and at leading order in alpha_s, with mutually inconsistent results, even when the same light-cone distribution amplitudes have been employed. We have recalculated the helicity amplitudes for this process, using contour deformations to evaluate the singular integrals over the light-cone momentum fractions. We do not obtain complete agreement with any previous result. Our results are closest to those of the most recent previous computation, differing significantly for just one of the three independent helicity amplitudes, and only for backward scattering angles. We present results for the unpolarized cross section, and for three different polarization asymmetries. We compare the perturbative QCD predictions for these observables with those of the handbag and diquark models. In order to reduce uncertainties associated with alpha_s and the three-quark wave function normalization, we have normalized the Compton cross section using the proton elastic form factor. The theoretical predictions for this ratio are about an order of magnitude below existing experimental data. |
2104.13390 | Fei Huang | Lucien Heurtier, Fei Huang, Tim M. P. Tait | Resurrecting Low-Mass Axion Dark Matter Via a Dynamical QCD Scale | 17 pages, 5 figures, match the published version | JHEP 12 (2021) 216 | 10.1007/JHEP12(2021)216 | UCI-HEP-TR-2021-13, IPPP/20/98 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework where the strong coupling is dynamical, the QCD sector may
confine at a much higher temperature than it would in the Standard Model, and
the temperature-dependent mass of the QCD axion evolves in a non-trivial way.
We find that, depending on the evolution of $\Lambda_{\mathrm{QCD}}$, the axion
field may undergo multiple distinct phases of damping and oscillation leading
generically to a suppression of its relic abundance. Such a suppression could
therefore open up a wide range of parameter space, resurrecting in particular
axion dark-matter models with a large Peccei-Quinn scale $f_a\gg
10^{12}~\mathrm{GeV}$, i.e., with a lighter mass than the standard QCD axion.
| [
{
"created": "Tue, 27 Apr 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jan 2022 00:43:20 GMT",
"version": "v2"
}
] | 2022-01-12 | [
[
"Heurtier",
"Lucien",
""
],
[
"Huang",
"Fei",
""
],
[
"Tait",
"Tim M. P.",
""
]
] | In the framework where the strong coupling is dynamical, the QCD sector may confine at a much higher temperature than it would in the Standard Model, and the temperature-dependent mass of the QCD axion evolves in a non-trivial way. We find that, depending on the evolution of $\Lambda_{\mathrm{QCD}}$, the axion field may undergo multiple distinct phases of damping and oscillation leading generically to a suppression of its relic abundance. Such a suppression could therefore open up a wide range of parameter space, resurrecting in particular axion dark-matter models with a large Peccei-Quinn scale $f_a\gg 10^{12}~\mathrm{GeV}$, i.e., with a lighter mass than the standard QCD axion. |
hep-ph/0603133 | Bernd Jantzen | Bernd Jantzen, Vladimir A. Smirnov | The two-loop vector form factor in the Sudakov limit | 25 pages. Bernd Jantzen was Bernd Feucht in publications before 2005.
v2: minor changes in the discussion of the results according to the version
published in Eur. Phys. J. C | Eur.Phys.J.C47:671-695,2006 | 10.1140/epjc/s2006-02583-9 | TTP06-05, PSI-PR-06-06, SFB/CPP-06-07 | hep-ph | null | Recently two-loop electroweak corrections to the neutral current four-fermion
processes at high energies have been presented. The basic ingredient of this
calculation is the evaluation of the two-loop corrections to the Abelian vector
form factor in a spontaneously broken SU(2) gauge model. Whereas the final
result and the derivation of the four-fermion cross sections from evolution
equations have been published earlier, the calculation of the form factor from
the two-loop Feynman diagrams is presented for the first time in this paper. We
describe in detail the individual contributions to the form factor and their
calculation with the help of the expansion by regions method and Mellin-Barnes
representations.
| [
{
"created": "Fri, 17 Mar 2006 15:03:16 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 2006 09:31:21 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Jantzen",
"Bernd",
""
],
[
"Smirnov",
"Vladimir A.",
""
]
] | Recently two-loop electroweak corrections to the neutral current four-fermion processes at high energies have been presented. The basic ingredient of this calculation is the evaluation of the two-loop corrections to the Abelian vector form factor in a spontaneously broken SU(2) gauge model. Whereas the final result and the derivation of the four-fermion cross sections from evolution equations have been published earlier, the calculation of the form factor from the two-loop Feynman diagrams is presented for the first time in this paper. We describe in detail the individual contributions to the form factor and their calculation with the help of the expansion by regions method and Mellin-Barnes representations. |
1211.0435 | Chiara Arina | Chiara Arina, Rabindra N. Mohapatra and Narendra Sahu | Co-genesis of Matter and Dark Matter with Vector-like Fourth Generation
Leptons | 7 pages, 5 figures and small corrections to match the version
accepted for publication in Physics Letters B | null | 10.1016/j.physletb.2013.01.059 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simple extension of the standard model by adding a fourth
generation vector-like lepton doublet and show that if the fourth neutrino is a
massive pseudo-Dirac fermion with mass in the few hundred GeV range and mass
splitting of about 100 keV, its lighter component can be a viable inelastic
dark matter candidate. Its relic abundance is produced by the CP violating
out-of-equilibrium decay of the type-II seesaw scalar triplet, which also gives
rise to the required baryon asymmetry of the Universe via type-II leptogenesis,
thus providing a simultaneous explanation of dark matter and baryon abundance
observed today. Moreover, the induced vacuum expectation value of the same
scalar triplet is responsible for the sub-eV Majorana masses to the three
active neutrinos. A stable fourth generation of neutrinos is elusive at
collider, however might be detected by current dark matter direct search
experiments.
| [
{
"created": "Fri, 2 Nov 2012 12:16:51 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2013 16:43:10 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Arina",
"Chiara",
""
],
[
"Mohapatra",
"Rabindra N.",
""
],
[
"Sahu",
"Narendra",
""
]
] | We propose a simple extension of the standard model by adding a fourth generation vector-like lepton doublet and show that if the fourth neutrino is a massive pseudo-Dirac fermion with mass in the few hundred GeV range and mass splitting of about 100 keV, its lighter component can be a viable inelastic dark matter candidate. Its relic abundance is produced by the CP violating out-of-equilibrium decay of the type-II seesaw scalar triplet, which also gives rise to the required baryon asymmetry of the Universe via type-II leptogenesis, thus providing a simultaneous explanation of dark matter and baryon abundance observed today. Moreover, the induced vacuum expectation value of the same scalar triplet is responsible for the sub-eV Majorana masses to the three active neutrinos. A stable fourth generation of neutrinos is elusive at collider, however might be detected by current dark matter direct search experiments. |
1302.0846 | Frank Tackmann | Teppo T. Jouttenus, Iain W. Stewart, Frank J. Tackmann, and Wouter J.
Waalewijn | Jet Mass Spectra in Higgs + One Jet at NNLL | 29 pages, 18 figures, v2: included R dependence in the soft scale,
added plot for convergence of hard function with complex hard scale | Phys. Rev. D 88, 054031 (2013) | 10.1103/PhysRevD.88.054031 | MIT-CTP 4427, DESY 12-222 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The invariant mass of a jet is a benchmark variable describing the structure
of jets at the LHC. We calculate the jet mass spectrum for Higgs plus one jet
at the LHC at next-to-next-to-leading logarithmic (NNLL) order using a
factorization formula. At this order, the cross section becomes sensitive to
perturbation theory at the soft m_jet^2/p_T^jet scale. Our calculation is
exclusive and uses the 1-jettiness global event shape to implement a veto on
additional jets. The dominant dependence on the jet veto is removed by
normalizing the spectrum, leaving residual dependence from non-global
logarithms depending on the ratio of the jet mass and jet veto variables. For
our exclusive jet cross section these non-global logarithms are parametrically
smaller than in the inclusive case, allowing us to obtain a complete NNLL
result. Results for the dependence of the jet mass spectrum on the kinematics,
jet algorithm, and jet size R are given. Using individual partonic channels we
illustrate the difference between the jet mass spectra for quark and gluon
jets. We also study the effect of hadronization and underlying event on the jet
mass in PYTHIA. To highlight the similarity of inclusive and exclusive jet mass
spectra, a comparison to LHC data is presented.
| [
{
"created": "Mon, 4 Feb 2013 21:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2013 08:50:38 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Jouttenus",
"Teppo T.",
""
],
[
"Stewart",
"Iain W.",
""
],
[
"Tackmann",
"Frank J.",
""
],
[
"Waalewijn",
"Wouter J.",
""
]
] | The invariant mass of a jet is a benchmark variable describing the structure of jets at the LHC. We calculate the jet mass spectrum for Higgs plus one jet at the LHC at next-to-next-to-leading logarithmic (NNLL) order using a factorization formula. At this order, the cross section becomes sensitive to perturbation theory at the soft m_jet^2/p_T^jet scale. Our calculation is exclusive and uses the 1-jettiness global event shape to implement a veto on additional jets. The dominant dependence on the jet veto is removed by normalizing the spectrum, leaving residual dependence from non-global logarithms depending on the ratio of the jet mass and jet veto variables. For our exclusive jet cross section these non-global logarithms are parametrically smaller than in the inclusive case, allowing us to obtain a complete NNLL result. Results for the dependence of the jet mass spectrum on the kinematics, jet algorithm, and jet size R are given. Using individual partonic channels we illustrate the difference between the jet mass spectra for quark and gluon jets. We also study the effect of hadronization and underlying event on the jet mass in PYTHIA. To highlight the similarity of inclusive and exclusive jet mass spectra, a comparison to LHC data is presented. |
hep-ph/9407250 | Jan Bolz | J. Bolz, R. Jakob, P. Kroll, M. Bergmann, N.G. Stefanis | Intrinsic Transverse Size Effect | 12 pages LATEX, 4 figures as compressed uu-encoded PS-file, preprint
University of Wuppertal WU-B-94-16, University of Bochum RUB-TPII-04/94 (some
typos eliminated) | Phys.Lett.B342:345-350,1995 | 10.1016/0370-2693(94)01379-Q | null | hep-ph | null | Two recently proposed concepts to improve the perturbative calculation of
exclusive amplitudes, gluonic radiative corrections (Sudakov factor) and
confinement size effects (intrinsic transverse momentum) are combined to study
the neutron magnetic form factor in the space-like region. We find that nucleon
distribution amplitudes modelled on the basis of current QCD sum rules indicate
overlap with the existing data at the highest measured values of momentum
transfer. However, sizeable higher-order perturbative corrections (K-factor)
and/or higher-twist contributions cannot be excluded, although they may be
weaker than in the proton case.
| [
{
"created": "Thu, 7 Jul 1994 14:33:07 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 1994 14:57:08 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Bolz",
"J.",
""
],
[
"Jakob",
"R.",
""
],
[
"Kroll",
"P.",
""
],
[
"Bergmann",
"M.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | Two recently proposed concepts to improve the perturbative calculation of exclusive amplitudes, gluonic radiative corrections (Sudakov factor) and confinement size effects (intrinsic transverse momentum) are combined to study the neutron magnetic form factor in the space-like region. We find that nucleon distribution amplitudes modelled on the basis of current QCD sum rules indicate overlap with the existing data at the highest measured values of momentum transfer. However, sizeable higher-order perturbative corrections (K-factor) and/or higher-twist contributions cannot be excluded, although they may be weaker than in the proton case. |
hep-ph/9805469 | Adel Bilal | Adel Bilal | Duality, Superstrings and M-theory | 8 pages, uses supplied Latex macro, two figures | null | null | LPTENS-98/18 | hep-ph hep-th | null | In these notes, based on a talk given at the Rencontres de Moriond, I give a
simple introduction to the tremendous progress that has been made during the
last few years towards the understanding of strong-coupling phenomena in
quantum gauge theories and superstring theories.
| [
{
"created": "Tue, 26 May 1998 19:07:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bilal",
"Adel",
""
]
] | In these notes, based on a talk given at the Rencontres de Moriond, I give a simple introduction to the tremendous progress that has been made during the last few years towards the understanding of strong-coupling phenomena in quantum gauge theories and superstring theories. |
1501.04988 | Fernando Iguaz\'u Ram\'irez-Zavaleta | J. I. Aranda, I. Cortes-Maldonado, F. Ram\'irez-Zavaleta, E. S. Tututi | The $Z_H \to \gamma H$ decay in the Littlest Higgs Model | 10 pages and 9 figures. Revised version | null | 10.1088/0954-3899/43/2/025002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the calculation of the $Z_H \to \gamma H$ decay in the context of
the Littlest Higgs model at one-loop level. Our calculations include the
contributions of fermions, scalars and gauge bosons in accordance with the most
recent experimental constraints on the parameters space of the model. We find
branching ratios of the order of $10^{-5}$ for the energy scale $f=2,3,4$ TeV
on the $0.1<c<0.9$ region. In order to provide a complementary study we
calculated the production cross section of the $Z_H$ boson in $pp$ collisions
at Large Hadron Collider with a center of mass energy of 14 TeV. By using the
integrated luminosity projected for the Large Hadron Collider in the last stage
of operation, we estimated the number of events for this process. Moreover, we
analyze the SM background for the Higgs-photon associated production and found
that the $pp\to Z_H X \to \gamma H$ production is above the SM background.
| [
{
"created": "Tue, 20 Jan 2015 21:38:19 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Sep 2015 23:29:52 GMT",
"version": "v2"
}
] | 2016-01-20 | [
[
"Aranda",
"J. I.",
""
],
[
"Cortes-Maldonado",
"I.",
""
],
[
"Ramírez-Zavaleta",
"F.",
""
],
[
"Tututi",
"E. S.",
""
]
] | We present the calculation of the $Z_H \to \gamma H$ decay in the context of the Littlest Higgs model at one-loop level. Our calculations include the contributions of fermions, scalars and gauge bosons in accordance with the most recent experimental constraints on the parameters space of the model. We find branching ratios of the order of $10^{-5}$ for the energy scale $f=2,3,4$ TeV on the $0.1<c<0.9$ region. In order to provide a complementary study we calculated the production cross section of the $Z_H$ boson in $pp$ collisions at Large Hadron Collider with a center of mass energy of 14 TeV. By using the integrated luminosity projected for the Large Hadron Collider in the last stage of operation, we estimated the number of events for this process. Moreover, we analyze the SM background for the Higgs-photon associated production and found that the $pp\to Z_H X \to \gamma H$ production is above the SM background. |
1302.0861 | Ricardo Gonzalez Felipe | R. Gonzalez Felipe, H. Serodio, Joao P. Silva | Models with three Higgs doublets in the triplet representations of A4 or
S4 | 7 pages; references added and detailed physical constraints included | Phys.Rev. D87 (2013) 055010 | 10.1103/PhysRevD.87.055010 | CFTP/13-003 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the quark sector of theories containing three scalar SU(2)_L
doublets in the triplet representation of A4 (or of S4) and three generations
of quarks in arbitrary A4 (or S4) representations. We show that, for all
possible choices of quark field representations and for all possible alignments
of the Higgs vacuum expectation values that can constitute global minima of the
scalar potential, it is not possible to obtain simultaneously non-vanishing
quark masses and a non-vanishing CP-violating phase in the CKM quark mixing
matrix. As a result, in this minimal form, models with three scalar fields in
the triplet representation of A4 or of S4 cannot be extended to the quark
sector in a way consistent with experiment.
| [
{
"created": "Mon, 4 Feb 2013 21:03:17 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2013 17:37:10 GMT",
"version": "v2"
}
] | 2013-09-10 | [
[
"Felipe",
"R. Gonzalez",
""
],
[
"Serodio",
"H.",
""
],
[
"Silva",
"Joao P.",
""
]
] | We consider the quark sector of theories containing three scalar SU(2)_L doublets in the triplet representation of A4 (or of S4) and three generations of quarks in arbitrary A4 (or S4) representations. We show that, for all possible choices of quark field representations and for all possible alignments of the Higgs vacuum expectation values that can constitute global minima of the scalar potential, it is not possible to obtain simultaneously non-vanishing quark masses and a non-vanishing CP-violating phase in the CKM quark mixing matrix. As a result, in this minimal form, models with three scalar fields in the triplet representation of A4 or of S4 cannot be extended to the quark sector in a way consistent with experiment. |
hep-ph/0211332 | Susana Cebrian | A. Morales and J. Morales | The Neutrinoless Double Beta Decay: The Case for Germanium Detectors | 5 figures, Invited contribution at the XXX International Meeting on
Fundamental Physics, IMFP2002, February 2002, Jaca, Spain. To appear in Nucl.
Phys. B (Proc. Suppl) | Nucl.Phys.Proc.Suppl. 114 (2003) 141-157 | 10.1016/S0920-5632(02)01901-1 | null | hep-ph | null | An overview of the current status of Neutrinoless Double Beta Decay is
presented, emphasizing on the case of Germanium Detectors.
| [
{
"created": "Thu, 21 Nov 2002 15:22:00 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Morales",
"A.",
""
],
[
"Morales",
"J.",
""
]
] | An overview of the current status of Neutrinoless Double Beta Decay is presented, emphasizing on the case of Germanium Detectors. |
1207.1116 | Stefan Stricker | Rudolf Baier, Stefan A. Stricker, Olli Taanila, Aleksi Vuorinen | Production of Prompt Photons: Holographic Duality and Thermalization | 5 pages, 4 figures, v3: Minor mistake corrected in the calculations,
figures and discussion adapted accordingly | null | 10.1103/PhysRevD.86.081901 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of prompt photons in strongly coupled
out-of-equilibrium Super Yang-Mills plasma using the AdS/CFT correspondence.
Our goal is to determine the photon emission spectrum at different stages of a
thermalization process, which is modeled via the gravitational collapse of a
thin spherical shell in AdS$_5$ space. Particular emphasis is placed on the
limit of large frequencies, which we are able to treat analytically.
| [
{
"created": "Wed, 4 Jul 2012 20:14:43 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2012 08:34:31 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Aug 2012 14:43:15 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Baier",
"Rudolf",
""
],
[
"Stricker",
"Stefan A.",
""
],
[
"Taanila",
"Olli",
""
],
[
"Vuorinen",
"Aleksi",
""
]
] | We study the production of prompt photons in strongly coupled out-of-equilibrium Super Yang-Mills plasma using the AdS/CFT correspondence. Our goal is to determine the photon emission spectrum at different stages of a thermalization process, which is modeled via the gravitational collapse of a thin spherical shell in AdS$_5$ space. Particular emphasis is placed on the limit of large frequencies, which we are able to treat analytically. |
1107.2008 | C. J. A. P. Martins | A.S. Nunes, A. Avgoustidis, C.J.A.P. Martins, J. Urrestilla | Analytic Models for the Evolution of Semilocal String Networks | 13 pages, 13 figures, submitted to Phys. Rev. D; v.2: minor
corrections and clarifications, following referee's suggestions | Phys.Rev.D84:063504,2011 | 10.1103/PhysRevD.84.063504 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit previously developed analytic models for defect evolution and
adapt them appropriately for the study of semilocal string networks. We thus
confirm the expectation (based on numerical simulations) that linear scaling
evolution is the attractor solution for a broad range of model parameters. We
discuss in detail the evolution of individual semilocal segments, focusing on
the phenomenology of segment growth, and also provide a preliminary comparison
with existing numerical simulations.
| [
{
"created": "Mon, 11 Jul 2011 12:17:35 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2011 13:59:54 GMT",
"version": "v2"
}
] | 2011-10-11 | [
[
"Nunes",
"A. S.",
""
],
[
"Avgoustidis",
"A.",
""
],
[
"Martins",
"C. J. A. P.",
""
],
[
"Urrestilla",
"J.",
""
]
] | We revisit previously developed analytic models for defect evolution and adapt them appropriately for the study of semilocal string networks. We thus confirm the expectation (based on numerical simulations) that linear scaling evolution is the attractor solution for a broad range of model parameters. We discuss in detail the evolution of individual semilocal segments, focusing on the phenomenology of segment growth, and also provide a preliminary comparison with existing numerical simulations. |
hep-ph/9402357 | null | Taichiro KUGO and Joe SATO | Dynamical Symmetry Breaking in an E_6 GUT Model | 29 pages (no figures), phyzzx and tables.tex KUNS-1251 | Prog.Theor.Phys. 91 (1994) 1217-1238 | 10.1143/ptp/91.6.1217 | null | hep-ph | null | Dynamical symmetry breaking is studied in an E_6 GUT model of a single
generation of fermions with strong 4-fermi interactions. The effective
potential is analyzed analytically by the help of Michel's conjecture and the
result is confirmed numerically. We find that the E_6 symmetry is spontaneously
broken either to F_4 or to Sp(8) or G_2 or SU(3), depending on which of the
4-fermi coupling constants G_27 and G_351 in the 27/351 channels is stronger.
The possibilities for obtaining other type of breaking patterns are also
discussed.
| [
{
"created": "Sat, 26 Feb 1994 10:52:09 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"KUGO",
"Taichiro",
""
],
[
"SATO",
"Joe",
""
]
] | Dynamical symmetry breaking is studied in an E_6 GUT model of a single generation of fermions with strong 4-fermi interactions. The effective potential is analyzed analytically by the help of Michel's conjecture and the result is confirmed numerically. We find that the E_6 symmetry is spontaneously broken either to F_4 or to Sp(8) or G_2 or SU(3), depending on which of the 4-fermi coupling constants G_27 and G_351 in the 27/351 channels is stronger. The possibilities for obtaining other type of breaking patterns are also discussed. |
1807.08520 | Zhi-Gang Wang | Zhi-Gang Wang, Zun-Yan Di | Analysis of the vector and axialvector $QQ\bar{Q}\bar{Q}$ tetraquark
states with QCD sum rules | 11 pages, 10 figures. arXiv admin note: substantial text overlap with
arXiv:1701.04285 | Acta Phys.Polon. B50 (2019) 1335 | 10.5506/APhysPolB.50.1335 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we construct the axialvector-diquark-axialvector-antidiquark
type currents to study both the vector and axialvector $QQ\bar{Q}\bar{Q}$
tetraquark states with the QCD sum rules, and obtain the masses
$M_{Y(cc\bar{c}\bar{c},1^{+-})} =6.05\pm0.08\,\rm{GeV}$,
$M_{Y(cc\bar{c}\bar{c},1^{--})} =6.11\pm0.08\,\rm{GeV}$,
$M_{Y(bb\bar{b}\bar{b},1^{+-})} =18.84\pm0.09\,\rm{GeV}$,
$M_{Y(bb\bar{b}\bar{b},1^{--})} =18.89\pm0.09\,\rm{GeV}$. The vector tetraquark
states lie $40\,\rm{MeV}$ above the corresponding centroids of the $0^{++}$,
$1^{+-}$ and $2^{++}$ tetraquark states, which is a typical feature of the
vector tetraquark states consist of four heavy quarks.
| [
{
"created": "Mon, 23 Jul 2018 10:37:24 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2018 08:44:37 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Apr 2019 12:45:29 GMT",
"version": "v3"
}
] | 2019-07-16 | [
[
"Wang",
"Zhi-Gang",
""
],
[
"Di",
"Zun-Yan",
""
]
] | In this article, we construct the axialvector-diquark-axialvector-antidiquark type currents to study both the vector and axialvector $QQ\bar{Q}\bar{Q}$ tetraquark states with the QCD sum rules, and obtain the masses $M_{Y(cc\bar{c}\bar{c},1^{+-})} =6.05\pm0.08\,\rm{GeV}$, $M_{Y(cc\bar{c}\bar{c},1^{--})} =6.11\pm0.08\,\rm{GeV}$, $M_{Y(bb\bar{b}\bar{b},1^{+-})} =18.84\pm0.09\,\rm{GeV}$, $M_{Y(bb\bar{b}\bar{b},1^{--})} =18.89\pm0.09\,\rm{GeV}$. The vector tetraquark states lie $40\,\rm{MeV}$ above the corresponding centroids of the $0^{++}$, $1^{+-}$ and $2^{++}$ tetraquark states, which is a typical feature of the vector tetraquark states consist of four heavy quarks. |
1501.06454 | Masafumi Kurachi | Masafumi Kurachi, Robert Shrock and Koichi Yamawaki | Determination of SU(4)$_{TC}$ Technicolor Gauge Group from Embedding in
Extended Technicolor | 5 pages | Phys. Rev. D91, 055032 (2015) | 10.1103/PhysRevD.91.055032 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In technicolor theories using an SU($N_{TC}$) gauge group, the value of
$N_{TC}$ is not, {\it a priori}, determined and is typically chosen by
phenomenological criteria. Here we present a novel way to determine $N_{TC}$
from the embedding of a one-family technicolor model, with fermions in the
fundamental represention of SU($N_{TC}$), in an extended technicolor theory,
and use it to deduce that $N_{TC}=4$ in this framework.
| [
{
"created": "Mon, 26 Jan 2015 15:57:32 GMT",
"version": "v1"
}
] | 2015-03-31 | [
[
"Kurachi",
"Masafumi",
""
],
[
"Shrock",
"Robert",
""
],
[
"Yamawaki",
"Koichi",
""
]
] | In technicolor theories using an SU($N_{TC}$) gauge group, the value of $N_{TC}$ is not, {\it a priori}, determined and is typically chosen by phenomenological criteria. Here we present a novel way to determine $N_{TC}$ from the embedding of a one-family technicolor model, with fermions in the fundamental represention of SU($N_{TC}$), in an extended technicolor theory, and use it to deduce that $N_{TC}=4$ in this framework. |
1512.04414 | Angelo Esposito | Angelo Esposito | Compact Tetraquark Interpretation of the XYZ States | 6 pages, 3 figures. Proceeding for the Hadron 2015 conference @ JLab,
Virginia | null | 10.1063/1.4949443 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The past decade witnessed the observation of several exotic charmonium-like
resonances, some of which are manifestly non-qqbar mesons. We review one of the
most popular interpretations of such states: the compact tetraquark in the
constituent diquark-antidiquark picture. Moreover, we discuss some unexplored
decay channels which are particularly sensitive to the different
phenomenological models and could therefore shed some light on the nature of
these fascinating states. Some brief comments on the recently observed
pentaquarks are also included.
| [
{
"created": "Mon, 14 Dec 2015 17:18:53 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Esposito",
"Angelo",
""
]
] | The past decade witnessed the observation of several exotic charmonium-like resonances, some of which are manifestly non-qqbar mesons. We review one of the most popular interpretations of such states: the compact tetraquark in the constituent diquark-antidiquark picture. Moreover, we discuss some unexplored decay channels which are particularly sensitive to the different phenomenological models and could therefore shed some light on the nature of these fascinating states. Some brief comments on the recently observed pentaquarks are also included. |
2211.17031 | Matthias Schindler | Stefan Scherer, Matthias R. Schindler | Chiral perturbation theory | contribution to the review "50 Years of Quantum Chromodynamics,"
edited by F. Gross and E. Klempt [arXiv:2212.11107], to be published in EPJC | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chiral perturbation theory (ChPT) is an effective field theory that describes
the properties of strongly-interacting systems at energies far below typical
hadron masses. The degrees of freedom are hadrons instead of the underlying
quarks and gluons. ChPT is a systematic and model-independent approximation
method based on an expansion of amplitudes in terms of light-quark masses and
momenta. The following is a brief overview of ChPT that is largely based on
Scherer, Schindler, Lect. Notes Phys. 830 (2012), which can be referred to for
a more detailed introduction.
| [
{
"created": "Wed, 30 Nov 2022 14:26:06 GMT",
"version": "v1"
}
] | 2022-12-27 | [
[
"Scherer",
"Stefan",
""
],
[
"Schindler",
"Matthias R.",
""
]
] | Chiral perturbation theory (ChPT) is an effective field theory that describes the properties of strongly-interacting systems at energies far below typical hadron masses. The degrees of freedom are hadrons instead of the underlying quarks and gluons. ChPT is a systematic and model-independent approximation method based on an expansion of amplitudes in terms of light-quark masses and momenta. The following is a brief overview of ChPT that is largely based on Scherer, Schindler, Lect. Notes Phys. 830 (2012), which can be referred to for a more detailed introduction. |
2402.10755 | John Ellis | John Ellis | Gravitational Waves: Echoes of the Biggest Bangs since the Big Bang
and/or BSM Physics? | 12 pages, 8 figures, Contribution to Universe Special Issue: Particle
Physics and Cosmology: A Themed Issue in Honour of Professor Dimitri
Nanopoulos | null | null | KCL-PH-TH/2024-05 | hep-ph astro-ph.CO gr-qc hep-ex | http://creativecommons.org/licenses/by/4.0/ | "If one could ever prove the existence of gravitational waves, the processes
responsible for their generation would probably be much more curious and
interesting than even the waves themselves." (Gustav Mie, 1868 - 1957) The
discovery of gravitational waves has opened new windows on astrophysics,
cosmology and physics beyond the Standard Model (BSM). Measurements by the
LIGO, Virgo and KAGRA Collaborations of stellar-mass binaries and neutron star
mergers have shown that gravitational waves travel at close to the velocity of
light, and also constrain BSM possibilities such as a graviton mass and Lorentz
violation in gravitational wave propagation. Follow-up measurements of neutron
star mergers have provided evidence for the production of heavy elements,
possibly including some essential for human life. The gravitational waves in
the nanoHz range observed by Pulsar Timing Arrays (PTAs) may have been emitted
by supermassive black hole binaries, but might also have originated from BSM
cosmological scenarios such as cosmic strings, or phase transitions in the
early Universe. The answer to the question in the title may be provided by
gravitational-wave detectors at higher frequencies, such as LISA and atom
interferometers.
| [
{
"created": "Fri, 16 Feb 2024 15:25:38 GMT",
"version": "v1"
}
] | 2024-02-19 | [
[
"Ellis",
"John",
""
]
] | "If one could ever prove the existence of gravitational waves, the processes responsible for their generation would probably be much more curious and interesting than even the waves themselves." (Gustav Mie, 1868 - 1957) The discovery of gravitational waves has opened new windows on astrophysics, cosmology and physics beyond the Standard Model (BSM). Measurements by the LIGO, Virgo and KAGRA Collaborations of stellar-mass binaries and neutron star mergers have shown that gravitational waves travel at close to the velocity of light, and also constrain BSM possibilities such as a graviton mass and Lorentz violation in gravitational wave propagation. Follow-up measurements of neutron star mergers have provided evidence for the production of heavy elements, possibly including some essential for human life. The gravitational waves in the nanoHz range observed by Pulsar Timing Arrays (PTAs) may have been emitted by supermassive black hole binaries, but might also have originated from BSM cosmological scenarios such as cosmic strings, or phase transitions in the early Universe. The answer to the question in the title may be provided by gravitational-wave detectors at higher frequencies, such as LISA and atom interferometers. |
hep-ph/9909525 | S. weinzierl | Stefan Weinzierl | Massive gauge bosons from the conservation of topological winding
numbers | 10 pages | null | null | null | hep-ph hep-th | null | We consider a U(1) x SU(2) gauge theory on the four-dimensional manifold S^1
x S^3. If we make the assumption that only gauge transformations connected to
the identity are allowed, the winding numbers of U(1) around S^1 and of SU(2)
around S^3 become topological conserved quantities. We derive the effective
theory for non-trivial winding numbers if all distances are small compared to
the radii of the spheres. In the non-abelian case the gauge bosons become
massive.
| [
{
"created": "Tue, 28 Sep 1999 09:26:13 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Weinzierl",
"Stefan",
""
]
] | We consider a U(1) x SU(2) gauge theory on the four-dimensional manifold S^1 x S^3. If we make the assumption that only gauge transformations connected to the identity are allowed, the winding numbers of U(1) around S^1 and of SU(2) around S^3 become topological conserved quantities. We derive the effective theory for non-trivial winding numbers if all distances are small compared to the radii of the spheres. In the non-abelian case the gauge bosons become massive. |
0910.5348 | Philip G. Ratcliffe | Philip G. Ratcliffe and Oleg Teryaev | Non-Universality and Evolution of the Sivers Function | Presented at the ECT* Workshop on Recent Advances in Perturbative QCD
and Hadronic Physics (20-25 July 2009} - final version (minor modifications) | null | 10.1142/S0217732309001194 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the large-x QCD evolution of the twist-three gluonic-pole strength
defining an effective T-odd Sivers function, where evolution of the T-even
transverse-spin DIS structure function g2 is multiplicative. The result
corresponds to a colour-factor modified spin-averaged twist-two evolution.
| [
{
"created": "Wed, 28 Oct 2009 11:27:33 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Nov 2009 11:09:58 GMT",
"version": "v2"
}
] | 2015-05-14 | [
[
"Ratcliffe",
"Philip G.",
""
],
[
"Teryaev",
"Oleg",
""
]
] | We examine the large-x QCD evolution of the twist-three gluonic-pole strength defining an effective T-odd Sivers function, where evolution of the T-even transverse-spin DIS structure function g2 is multiplicative. The result corresponds to a colour-factor modified spin-averaged twist-two evolution. |
hep-ph/0006304 | John M. Campbell | J. M. Campbell and R. K. Ellis | Radiative corrections to Zb{\bar b} production | 33 pages, 7 figures included | Phys.Rev.D62:114012,2000 | 10.1103/PhysRevD.62.114012 | FERMILAB-PUB-00/145-T | hep-ph | null | We report on QCD radiative corrections to the process, p\bar{p} to Zb\bar{b}
in the approximation in which the b-quark is considered massless. The
implementation of this process in the general purpose Monte Carlo program MCFM
is discussed in some detail. These results are used to investigate backgrounds
to Higgs boson production in the ZH channel. We investigate the Higgs mass
range (100 GeV < m_H < 130 GeV) for the Tevatron running at sqrt{s}=2 TeV.
| [
{
"created": "Tue, 27 Jun 2000 14:42:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Campbell",
"J. M.",
""
],
[
"Ellis",
"R. K.",
""
]
] | We report on QCD radiative corrections to the process, p\bar{p} to Zb\bar{b} in the approximation in which the b-quark is considered massless. The implementation of this process in the general purpose Monte Carlo program MCFM is discussed in some detail. These results are used to investigate backgrounds to Higgs boson production in the ZH channel. We investigate the Higgs mass range (100 GeV < m_H < 130 GeV) for the Tevatron running at sqrt{s}=2 TeV. |
1705.00619 | Samuel D McDermott | Samuel D. McDermott, Hiren H. Patel, Harikrishnan Ramani | Dark Photon Decay Beyond The Euler-Heisenberg Limit | 6 pages | Phys. Rev. D 97, 073005 (2018) | 10.1103/PhysRevD.97.073005 | ACFI-T17-08, YITP-SB-17-14 | hep-ph astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the exact width for a dark photon decaying to three photons at
one loop order for dark photon masses m' below the e+e- production threshold of
2m_e. We find substantial deviations from previous results derived from the
lowest order Euler-Heisenberg effective Lagrangian in the range m_e < m' <
2m_e, where higher order terms in the derivative expansion are nonnegligible.
This mass range is precisely where the three photon decay takes place on
cosmologically relevant timescales. Our improved analysis opens a window for
dark photons in the range 850 keV < m' < 2m_e, 10^-5 < epsilon < 10^-4.
| [
{
"created": "Mon, 1 May 2017 18:00:01 GMT",
"version": "v1"
}
] | 2018-05-02 | [
[
"McDermott",
"Samuel D.",
""
],
[
"Patel",
"Hiren H.",
""
],
[
"Ramani",
"Harikrishnan",
""
]
] | We calculate the exact width for a dark photon decaying to three photons at one loop order for dark photon masses m' below the e+e- production threshold of 2m_e. We find substantial deviations from previous results derived from the lowest order Euler-Heisenberg effective Lagrangian in the range m_e < m' < 2m_e, where higher order terms in the derivative expansion are nonnegligible. This mass range is precisely where the three photon decay takes place on cosmologically relevant timescales. Our improved analysis opens a window for dark photons in the range 850 keV < m' < 2m_e, 10^-5 < epsilon < 10^-4. |
hep-ph/0212035 | Masatomi Harada | Naoyuki Haba, Masatomi Harada, Yutaka Hosotani and Yoshiharu Kawamura | Dynamical Rearrangement of Gauge Symmetry on the Orbifold S^1/Z_2 | 57 pages, 4 figures. The error of a factor 2 in the effective
potential in the supersymmetric SU(5) model was corrected | Nucl.Phys. B657 (2003) 169-213; Erratum-ibid. B669 (2003) 381-382 | 10.1016/S0550-3213(03)00142-1 | OU-HET 424/2002 | hep-ph hep-th | null | Gauge theory defined on the orbifold $M^4 \times (S^1/Z_2)$ is investigated
from the viewpoint of the Hosotani mechanism. Rearrangement of gauge symmetry
takes place due to the dynamics of Wilson line phases. The physical symmetry of
the theory, in general, differs from the symmetry of the boundary conditions.
Several sets of boundary conditions having distinct symmetry can be related by
gauge transformations, belonging to the same equivalence class. The Hosotani
mechanism guarantees the same physics in all theories in one equivalent class.
Examples are presented in the SU(5) theory. Zero modes of the extra-dimensional
components, $A_y$, of gauge fields acquire masses by radiative corrections. In
the nonsupersymmetric SU(5) model the presence of bulk fermions leads to the
spontaneous breaking of color SU(3). In the supersymmetric model with
Scherk-Schwarz SUSY breaking zero modes of $A_y$'s acquire masses of order of
the SUSY breaking.
| [
{
"created": "Tue, 3 Dec 2002 08:45:20 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Feb 2003 05:16:10 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Jul 2003 05:00:32 GMT",
"version": "v3"
}
] | 2012-01-16 | [
[
"Haba",
"Naoyuki",
""
],
[
"Harada",
"Masatomi",
""
],
[
"Hosotani",
"Yutaka",
""
],
[
"Kawamura",
"Yoshiharu",
""
]
] | Gauge theory defined on the orbifold $M^4 \times (S^1/Z_2)$ is investigated from the viewpoint of the Hosotani mechanism. Rearrangement of gauge symmetry takes place due to the dynamics of Wilson line phases. The physical symmetry of the theory, in general, differs from the symmetry of the boundary conditions. Several sets of boundary conditions having distinct symmetry can be related by gauge transformations, belonging to the same equivalence class. The Hosotani mechanism guarantees the same physics in all theories in one equivalent class. Examples are presented in the SU(5) theory. Zero modes of the extra-dimensional components, $A_y$, of gauge fields acquire masses by radiative corrections. In the nonsupersymmetric SU(5) model the presence of bulk fermions leads to the spontaneous breaking of color SU(3). In the supersymmetric model with Scherk-Schwarz SUSY breaking zero modes of $A_y$'s acquire masses of order of the SUSY breaking. |
2211.07785 | Janelly Bautista | Carlos Alvarado, Janelly Bautista, and Alexander J. Stuart | Predicting Neutrino Mixing Angles Using Group Presentations | 14 pages. v3: References added, text further clarified, content
matches version published in IJMPA | Int.J.Mod.Phys.A 38 (2023) 06n07, 2350039 | 10.1142/S0217751X23500392 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | By assuming there exist three massive non-degenerate Majorana neutrinos, it
is possible to describe neutrino mixing with a residual, unbroken discrete
Klein subgroup of a larger spontaneously broken flavor symmetry group.
Motivated by forthcoming measurements of leptonic CP violation, we revisit this
framework by applying group presentation rules to it. We develop a method that
is able to reproduce all previous results in the literature and may also hint
at a possible group theoretical origin of CP violation in the Klein symmetry
elements. This is due to the explicit appearance of a phase in them. However,
for the cases considered in this analysis, it turns out that this phase can be
removed. Still, this new method warrants further study.
| [
{
"created": "Mon, 14 Nov 2022 22:43:11 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2022 20:32:03 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Mar 2024 21:58:28 GMT",
"version": "v3"
}
] | 2024-03-28 | [
[
"Alvarado",
"Carlos",
""
],
[
"Bautista",
"Janelly",
""
],
[
"Stuart",
"Alexander J.",
""
]
] | By assuming there exist three massive non-degenerate Majorana neutrinos, it is possible to describe neutrino mixing with a residual, unbroken discrete Klein subgroup of a larger spontaneously broken flavor symmetry group. Motivated by forthcoming measurements of leptonic CP violation, we revisit this framework by applying group presentation rules to it. We develop a method that is able to reproduce all previous results in the literature and may also hint at a possible group theoretical origin of CP violation in the Klein symmetry elements. This is due to the explicit appearance of a phase in them. However, for the cases considered in this analysis, it turns out that this phase can be removed. Still, this new method warrants further study. |
0706.3530 | Francesco Hautmann | F. Hautmann | Rescattering effects and the determination of the gluon density for x <<
1 | Talk presented at the XLII Rencontres de Moriond (La Thuile, March
2007) | null | null | null | hep-ph | null | We consider the possible role of rescattering effects in the determination of
the gluon density for the LHC from DIS data. We discuss a method that uses
results of s-channel calculations to estimate these effects, and comment on
potential applications to diffractive and multi-parton interactions.
| [
{
"created": "Sun, 24 Jun 2007 17:35:14 GMT",
"version": "v1"
}
] | 2007-06-26 | [
[
"Hautmann",
"F.",
""
]
] | We consider the possible role of rescattering effects in the determination of the gluon density for the LHC from DIS data. We discuss a method that uses results of s-channel calculations to estimate these effects, and comment on potential applications to diffractive and multi-parton interactions. |
0710.1882 | Vladislav Pantuev | V.S.Pantuev | "Jet-Ridge" effect in heavy ion collisions as a back splash from stopped
parton | 4 pages, 4 figures | null | null | null | hep-ph | null | I propose a simple explanation of the ``ridge'' seen in the near-side jet
two-particle correlation function in heavy ion collisions at RHIC. This could
be a cumulative shock wave produced in liquid-like matter by an energetic
stopped parton. Splash of liquid in the direction opposite to the fast
penetrating object is a known effect. In nucleus-nucleus collision the trigger
is an escaped non-interacting parton. Partner parton could be stopped in the
medium forming a conical-like shock wave with density depletion behind the
stopped parton. In the proposed scenario shock waves will move in three
directions: two waves will form a correlation structure at angles differ from
phi = 3.14 radians and are usually called a Mach Cone. The other direction is
exactly opposite to the original direction of stopping parton. The wide
rapidity distribution of the ridge is caused by the rapidity swing of the
away-side jet and longitudinal expansion of the system along the beam
direction. The calculation of such a shock wave is very complicated, but some
phenomenological observables could be explained and predicted.
| [
{
"created": "Tue, 9 Oct 2007 22:07:24 GMT",
"version": "v1"
}
] | 2007-10-11 | [
[
"Pantuev",
"V. S.",
""
]
] | I propose a simple explanation of the ``ridge'' seen in the near-side jet two-particle correlation function in heavy ion collisions at RHIC. This could be a cumulative shock wave produced in liquid-like matter by an energetic stopped parton. Splash of liquid in the direction opposite to the fast penetrating object is a known effect. In nucleus-nucleus collision the trigger is an escaped non-interacting parton. Partner parton could be stopped in the medium forming a conical-like shock wave with density depletion behind the stopped parton. In the proposed scenario shock waves will move in three directions: two waves will form a correlation structure at angles differ from phi = 3.14 radians and are usually called a Mach Cone. The other direction is exactly opposite to the original direction of stopping parton. The wide rapidity distribution of the ridge is caused by the rapidity swing of the away-side jet and longitudinal expansion of the system along the beam direction. The calculation of such a shock wave is very complicated, but some phenomenological observables could be explained and predicted. |
hep-ph/9607426 | Kataev | A.L.Kataev (INR,Moscow) | The generalized Crewther relation: the peculiar aspects of the
analytical perturbative QCD calculations | 22 pages, LATEX; Invited talk at the Workshop ``Continuous Advances
in QCD'', Minneapolis, March 28-31, 1996; to be published in the Proceedings | null | null | INR-0926/96 | hep-ph | null | We summarize the current status of our understanding of the structure of the
perturbative QCD expressions for the QCD generalization of the Crewther
relation.
| [
{
"created": "Thu, 25 Jul 1996 10:52:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kataev",
"A. L.",
"",
"INR,Moscow"
]
] | We summarize the current status of our understanding of the structure of the perturbative QCD expressions for the QCD generalization of the Crewther relation. |
1501.03693 | Matti Jarvinen | Matti Jarvinen | Recent progress in backreacted bottom-up holographic QCD | 6 pages, 3 figures. To appear in the proceedings of the conference
'XIth Quark Confinement and the Hadron Spectrum', St. Petersburg, September
8-12, 2014. v2: references updated. arXiv admin note: text overlap with
arXiv:1508.00685 | null | 10.1063/1.4938706 | CCTP-2015-02, CCQCN-2015-60 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent progress in constructing holographic models for QCD is discussed,
concentrating on the bottom-up models which implement holographically the
renormalization group flow of QCD. The dynamics of gluons can be modeled by
using a string-inspired model termed improved holographic QCD, and flavor can
be added by introducing space filling branes in this model. The flavor fully
backreacts to the glue in the Veneziano limit, giving rise to a class of models
which are called V-QCD. The phase diagrams and spectra of V-QCD are in good
agreement with results for QCD obtained by other methods.
| [
{
"created": "Thu, 15 Jan 2015 14:32:22 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2015 23:30:24 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Jarvinen",
"Matti",
""
]
] | Recent progress in constructing holographic models for QCD is discussed, concentrating on the bottom-up models which implement holographically the renormalization group flow of QCD. The dynamics of gluons can be modeled by using a string-inspired model termed improved holographic QCD, and flavor can be added by introducing space filling branes in this model. The flavor fully backreacts to the glue in the Veneziano limit, giving rise to a class of models which are called V-QCD. The phase diagrams and spectra of V-QCD are in good agreement with results for QCD obtained by other methods. |
1910.08092 | Tanner Trickle | Tanner Trickle, Zhengkang Zhang, Kathryn M. Zurek, Katherine Inzani,
Sin\'ead M. Griffin | Multi-Channel Direct Detection of Light Dark Matter: Theoretical
Framework | 39 pages, 6 figures, minor updates to constraint projections in
figures with PhonoDark v1.1.0 (https://phonodark.caltech.edu) | JHEP, 2020, Article number: 36 (2020) | 10.1007/JHEP03(2020)036 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a unified theoretical framework for computing spin-independent
direct detection rates via various channels relevant for sub-GeV dark matter --
nuclear recoils, electron transitions and single phonon excitations. Despite
the very different physics involved, in each case the rate factorizes into the
particle-level matrix element squared, and an integral over a target material-
and channel-specific dynamic structure factor. We show how the dynamic
structure factor can be derived in all three cases following the same
procedure, and extend previous results in the literature in several aspects.
For electron transitions, we incorporate directional dependence and point out
potential daily modulation signals in anisotropic target materials. For single
phonon excitations, we present a new derivation of the rate formula from first
principles for generic spin-independent couplings, and include the first
calculation of phonon excitation through electron couplings. We also discuss
the interplay between single phonon excitations and nuclear recoils, and
clarify the role of Umklapp processes, which can dominate the single phonon
production rate for dark matter heavier than an MeV. Our results highlight the
complementarity between various search channels in probing different kinematic
regimes of dark matter scattering, and provide a common reference to connect
dark matter theories with ongoing and future direct detection experiments.
| [
{
"created": "Thu, 17 Oct 2019 18:00:24 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 2020 17:39:58 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Oct 2021 18:41:18 GMT",
"version": "v3"
}
] | 2021-10-29 | [
[
"Trickle",
"Tanner",
""
],
[
"Zhang",
"Zhengkang",
""
],
[
"Zurek",
"Kathryn M.",
""
],
[
"Inzani",
"Katherine",
""
],
[
"Griffin",
"Sinéad M.",
""
]
] | We present a unified theoretical framework for computing spin-independent direct detection rates via various channels relevant for sub-GeV dark matter -- nuclear recoils, electron transitions and single phonon excitations. Despite the very different physics involved, in each case the rate factorizes into the particle-level matrix element squared, and an integral over a target material- and channel-specific dynamic structure factor. We show how the dynamic structure factor can be derived in all three cases following the same procedure, and extend previous results in the literature in several aspects. For electron transitions, we incorporate directional dependence and point out potential daily modulation signals in anisotropic target materials. For single phonon excitations, we present a new derivation of the rate formula from first principles for generic spin-independent couplings, and include the first calculation of phonon excitation through electron couplings. We also discuss the interplay between single phonon excitations and nuclear recoils, and clarify the role of Umklapp processes, which can dominate the single phonon production rate for dark matter heavier than an MeV. Our results highlight the complementarity between various search channels in probing different kinematic regimes of dark matter scattering, and provide a common reference to connect dark matter theories with ongoing and future direct detection experiments. |
2201.04659 | Farvah Mahmoudi | M.A. Boussejra, F. Mahmoudi, G. Uhlrich | Flavour anomalies in supersymmetric scenarios with non-minimal flavour
violation | 34 pages, 12 figures, 5 tables. v2: references added | Phys. Rev. D 106 (2022) 015018 | 10.1103/PhysRevD.106.015018 | CERN-TH-2022-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by tensions between experimental measurements and SM predictions in
$b\to s \ell^+\ell^-$ transitions, we present the first study of non-minimal
flavour-violating Minimal Supersymmetric Standard Model (MSSM) scenarios
contributing to the relevant Wilson coefficients to address the observed
anomalies using SuperIso and MARTY. We calculate the full one-loop analytical
contributions of the general MSSM to Wilson coefficients relevant for flavour
anomalies, together with the anomalous muon magnetic dipole moment $(g-2)_\mu$.
We show that, after imposing theoretical constraints on the flavour-violating
parameters we can find scenarios in agreement with the experimental
measurements that can address at the same time the tensions in flavour
observables and in $(g-2)_\mu$.
| [
{
"created": "Wed, 12 Jan 2022 19:17:11 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2022 14:27:40 GMT",
"version": "v2"
}
] | 2022-08-12 | [
[
"Boussejra",
"M. A.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Uhlrich",
"G.",
""
]
] | Motivated by tensions between experimental measurements and SM predictions in $b\to s \ell^+\ell^-$ transitions, we present the first study of non-minimal flavour-violating Minimal Supersymmetric Standard Model (MSSM) scenarios contributing to the relevant Wilson coefficients to address the observed anomalies using SuperIso and MARTY. We calculate the full one-loop analytical contributions of the general MSSM to Wilson coefficients relevant for flavour anomalies, together with the anomalous muon magnetic dipole moment $(g-2)_\mu$. We show that, after imposing theoretical constraints on the flavour-violating parameters we can find scenarios in agreement with the experimental measurements that can address at the same time the tensions in flavour observables and in $(g-2)_\mu$. |
2402.05850 | Francesco Sannino | Francesco Sannino | Two-index SU(N) theories: QCD, Orientifolds, Super Yang-Mills, Lattice
and Steven Weinberg's $\pi \pi$ scattering legacy | Typos corrected, version to match the one accepted for publication in
Nuclear Physics B | null | null | null | hep-ph hep-lat hep-th | http://creativecommons.org/licenses/by/4.0/ | I review and improve on how two-index SU(N) gauge-fermion theories help
access salient information about the large $N$ vacuum and spectrum of QCD,
super Yang Mills and meson-meson scattering. The interplay with recent lattice
simulations will be employed to deduce the size of $1/N^2$ corrections. Through
the meson-meson scattering analysis I will honor Steven Weinberg's memory by
showing how two-index extrapolations naturally accommodate the appearance of
tetraquarks states crucial to unitarize meson-meson scattering at low energies.
| [
{
"created": "Thu, 8 Feb 2024 17:32:29 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2024 06:53:58 GMT",
"version": "v2"
}
] | 2024-04-24 | [
[
"Sannino",
"Francesco",
""
]
] | I review and improve on how two-index SU(N) gauge-fermion theories help access salient information about the large $N$ vacuum and spectrum of QCD, super Yang Mills and meson-meson scattering. The interplay with recent lattice simulations will be employed to deduce the size of $1/N^2$ corrections. Through the meson-meson scattering analysis I will honor Steven Weinberg's memory by showing how two-index extrapolations naturally accommodate the appearance of tetraquarks states crucial to unitarize meson-meson scattering at low energies. |
1607.02827 | Alexander Korchin | Alexander Yu. Korchin, Vladimir A. Kovalchuk | Decay of the Higgs boson to $\tau^- \tau^+$ and non-Hermiticity of the
Yukawa interaction | 10 pages, 2 figures, revtex4; v2: one reference added, comparison
with results of other papers included, insignificant changes in tables,
corresponds to journal version; v3: minor typos corrected | Phys. Rev. D 94, 076003 (2016) | 10.1103/PhysRevD.94.076003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The issue of Hermiticity of the Higgs boson interaction with fermions is
addressed. A model for non-Hermitian Yukawa interaction is proposed and
approximation of one fermion generation is considered. Symmetry properties of
the corresponding $h f \bar{f}$ Lagrangian with respect to the discrete P, C
and T transformations are analyzed, and the modified Dirac equation for the
free fermion is studied. Longitudinal polarization of the fermions in the decay
$h \to f \bar{f}$, which arises due to non-Hermiticity of the $h f \bar{f}$
interaction, is discussed. It is suggested to study effects of this
non-Hermiticity in the decay $h \to \tau^- \tau^+ \to \mu^- {\bar \nu}_\mu
\nu_\tau \, \mu^+ \nu_\mu {\bar \nu}_\tau$, for which observables (asymmetries)
are constructed which take nonzero values for a non-Hermitian $h \tau^- \tau^+$
interaction. These asymmetries are analyzed for various configurations of the
muon energies.
| [
{
"created": "Mon, 11 Jul 2016 06:10:34 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Oct 2016 10:45:23 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Jan 2017 13:39:53 GMT",
"version": "v3"
}
] | 2017-01-19 | [
[
"Korchin",
"Alexander Yu.",
""
],
[
"Kovalchuk",
"Vladimir A.",
""
]
] | The issue of Hermiticity of the Higgs boson interaction with fermions is addressed. A model for non-Hermitian Yukawa interaction is proposed and approximation of one fermion generation is considered. Symmetry properties of the corresponding $h f \bar{f}$ Lagrangian with respect to the discrete P, C and T transformations are analyzed, and the modified Dirac equation for the free fermion is studied. Longitudinal polarization of the fermions in the decay $h \to f \bar{f}$, which arises due to non-Hermiticity of the $h f \bar{f}$ interaction, is discussed. It is suggested to study effects of this non-Hermiticity in the decay $h \to \tau^- \tau^+ \to \mu^- {\bar \nu}_\mu \nu_\tau \, \mu^+ \nu_\mu {\bar \nu}_\tau$, for which observables (asymmetries) are constructed which take nonzero values for a non-Hermitian $h \tau^- \tau^+$ interaction. These asymmetries are analyzed for various configurations of the muon energies. |
hep-ph/9702365 | Boris Kopeliovich | B.Z. Kopeliovich (MPI Heidelberg) | Dynamics and Phenomenology of Charmonium Production off Nuclei | Based on the talks presented at the Workshop on Heavy Ion Collisions,
Clermont Ferrand, France, January 9-10, 1997 and at the Workshop 'QCD Phase
Transitions', Hirschegg, Austria, January 13-18, 1997 Some misprints are
fixed at the replacement | null | null | null | hep-ph nucl-th | null | Nuclear suppression of charmonium production in proton-nucleus interactions
is poorly understood, what restrains our attempts to single out unusual effects
in heavy ion collisions. We develop a phenomenological approach, based on the
light-cone dynamics of charmonium production, which has much in common with
deep-inelastic scattering and Drell-Yan lepton pair production. The key
observation is the existence of a soft mechanism of heavy flavour production,
which scales in the quark mass and dominates shadowing corrections and
diffraction. It naturally explains the surprisingly strong nuclear suppression
of J/Psi at large Feynman-x_F. The low-x_F region is subject to a complicated
interplay of hard and soft mechanisms. With evaluated parameters we nicely
describe available data on charmonium production in proton-nucleus collisions.
Using these results we predict a new process, diffractive production of
charmonium on a nucleon target, which fraction in the total production rate of
charmonium is evaluated at 12%.
| [
{
"created": "Tue, 18 Feb 1997 21:54:57 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Feb 1997 22:09:25 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Kopeliovich",
"B. Z.",
"",
"MPI Heidelberg"
]
] | Nuclear suppression of charmonium production in proton-nucleus interactions is poorly understood, what restrains our attempts to single out unusual effects in heavy ion collisions. We develop a phenomenological approach, based on the light-cone dynamics of charmonium production, which has much in common with deep-inelastic scattering and Drell-Yan lepton pair production. The key observation is the existence of a soft mechanism of heavy flavour production, which scales in the quark mass and dominates shadowing corrections and diffraction. It naturally explains the surprisingly strong nuclear suppression of J/Psi at large Feynman-x_F. The low-x_F region is subject to a complicated interplay of hard and soft mechanisms. With evaluated parameters we nicely describe available data on charmonium production in proton-nucleus collisions. Using these results we predict a new process, diffractive production of charmonium on a nucleon target, which fraction in the total production rate of charmonium is evaluated at 12%. |
1601.02033 | Abhishek Iyer M | A.M. Iyer, F. Mahmoudi, N. Manglani, K. Sridhar | Kaluza-Klein gluon + jets associated production at the Large Hadron
Collider | 16 Pages, 5 Figures v2: Improved analysis with multijet QCD
background accounted for. Added clarifications and references | Physics Letters B (2016) 342 | 10.1016/j.physletb.2016.05.090 | CERN-TH-2016-002, TIFR/TH/16-01 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The Kaluza-Klein excitations of gluons offer the exciting possibility of
probing bulk Randall-Sundrum (RS) models. In these bulk models either a
custodial symmetry or a deformation of the metric away from AdS is invoked in
order to deal with electroweak precision tests. Addressing both these models,
we suggest a new channel in which to study the production of KK-gluons
($g_{KK}$): one where it is produced in association with one or more hard jets.
The cross-section for the $g_{KK}+$ jets channel is significant because of
several contributing sub-processes. In particular, the 1-jet and the 2-jet
associated processes are important because at these orders in QCD the $qg$ and
the $gg$ initial states respectively come into play. We have performed a
hadron-level simulation of the signal and present strategies to effectively
extract the signal from what could potentially be a huge background. We present
results for the kinematic reach of the LHC Run-II for different $g_{KK}$ masses
in bulk-RS models.
| [
{
"created": "Fri, 8 Jan 2016 21:29:35 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2016 20:44:38 GMT",
"version": "v2"
}
] | 2016-06-14 | [
[
"Iyer",
"A. M.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Manglani",
"N.",
""
],
[
"Sridhar",
"K.",
""
]
] | The Kaluza-Klein excitations of gluons offer the exciting possibility of probing bulk Randall-Sundrum (RS) models. In these bulk models either a custodial symmetry or a deformation of the metric away from AdS is invoked in order to deal with electroweak precision tests. Addressing both these models, we suggest a new channel in which to study the production of KK-gluons ($g_{KK}$): one where it is produced in association with one or more hard jets. The cross-section for the $g_{KK}+$ jets channel is significant because of several contributing sub-processes. In particular, the 1-jet and the 2-jet associated processes are important because at these orders in QCD the $qg$ and the $gg$ initial states respectively come into play. We have performed a hadron-level simulation of the signal and present strategies to effectively extract the signal from what could potentially be a huge background. We present results for the kinematic reach of the LHC Run-II for different $g_{KK}$ masses in bulk-RS models. |
1811.00399 | Jean Cleymans | Natasha Sharma, Jean Cleymans, Boris Hippolyte, Masimba Paradza | A Comparison of p-p, p-Pb, Pb-Pb Collisions in the Thermal Model:
Multiplicity Dependence of Thermal Parameters | 11 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1803.05409 | Phys. Rev. C 99, 044914 (2019) | 10.1103/PhysRevC.99.044914 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | % An analysis is made of the particle composition (hadrochemistry) of the
final state in proton-proton (p-p), proton-lead (p-Pb) and lead-lead (Pb-Pb)
collisions as a function of the charged particle multiplicity ($\dNchdeta$).
The thermal model is used to determine the chemical freeze-out temperature as
well as the radius and strangeness saturation factor $\gamma_s$. Three
different ensembles are used in the analysis namely, the grand canonical
ensemble, the canonical ensemble with exact strangeness conservation and the
canonical ensemble with exact baryon number, strangeness and electric charge
conservation. It is shown that for high multiplicities (at least 20 charged
hadrons in the mid-rapidity interval considered) the three ensembles lead to
the same results.
| [
{
"created": "Thu, 1 Nov 2018 14:12:46 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2018 10:20:40 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Sharma",
"Natasha",
""
],
[
"Cleymans",
"Jean",
""
],
[
"Hippolyte",
"Boris",
""
],
[
"Paradza",
"Masimba",
""
]
] | % An analysis is made of the particle composition (hadrochemistry) of the final state in proton-proton (p-p), proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions as a function of the charged particle multiplicity ($\dNchdeta$). The thermal model is used to determine the chemical freeze-out temperature as well as the radius and strangeness saturation factor $\gamma_s$. Three different ensembles are used in the analysis namely, the grand canonical ensemble, the canonical ensemble with exact strangeness conservation and the canonical ensemble with exact baryon number, strangeness and electric charge conservation. It is shown that for high multiplicities (at least 20 charged hadrons in the mid-rapidity interval considered) the three ensembles lead to the same results. |
hep-ph/0701053 | Bhaskar Dutta | Richard Arnowitt, Adam Aurisano, Bhaskar Dutta, Teruki Kamon, Nikolay
Kolev, Paul Simeon, David Toback and Peter Wagner | Cosmology and Dark Matter at the LHC | 11 pages, 7 figures, Talk at IDM 2006, 11th September to 16th
September, Greece | null | 10.1142/9789812770288_0001 | null | hep-ph | null | We examine the question of whether neutralinos produced at the LHC can be
shown to be the particles making up the astronomically observed dark matter. If
the WIMP alllowed region lies in the SUGRA coannihilation region, then a strong
signal for this would be the unexpected near degeneracy of the stau and
neutralino i.e., a mass difference \Delta M\simeq (5-15) GeV. For the mSUGRA
model we show such a small mass difference can be measured at the LHC using the
signal 3\tau+jet+E_T^{\rm miss}. Two observables, opposite sign minus like sign
pairs and the peak of the \tau\tau mass distribution allows the simultaneous
determination of \Delta M to 15% and the gluino mass M_{\tilde g} to be 6% at
the benchmark point of M_{\tilde g}=850 GeV, A_0=0, \mu>0 with 30 fb^{-1}. With
10 fb^{-1}, \Delta M can be determined to 22% and one can probe the parameter
space up to m_{1/2}=700 GeV with 100 fb^{-1}.
| [
{
"created": "Mon, 8 Jan 2007 17:42:42 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Arnowitt",
"Richard",
""
],
[
"Aurisano",
"Adam",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Kamon",
"Teruki",
""
],
[
"Kolev",
"Nikolay",
""
],
[
"Simeon",
"Paul",
""
],
[
"Toback",
"David",
""
],
[
"Wa... | We examine the question of whether neutralinos produced at the LHC can be shown to be the particles making up the astronomically observed dark matter. If the WIMP alllowed region lies in the SUGRA coannihilation region, then a strong signal for this would be the unexpected near degeneracy of the stau and neutralino i.e., a mass difference \Delta M\simeq (5-15) GeV. For the mSUGRA model we show such a small mass difference can be measured at the LHC using the signal 3\tau+jet+E_T^{\rm miss}. Two observables, opposite sign minus like sign pairs and the peak of the \tau\tau mass distribution allows the simultaneous determination of \Delta M to 15% and the gluino mass M_{\tilde g} to be 6% at the benchmark point of M_{\tilde g}=850 GeV, A_0=0, \mu>0 with 30 fb^{-1}. With 10 fb^{-1}, \Delta M can be determined to 22% and one can probe the parameter space up to m_{1/2}=700 GeV with 100 fb^{-1}. |
1402.0514 | Jacques Soffer | Jacques Soffer, Claude Bourrely, Franco Buccella | Statistical description of the flavor structure of the nucleon sea | 6 pages, 3 figures, invited talk at DSPIN-13, XV Advanced Research
Workshop on High Energy Spin Physics, Dubna (Russia), Oct. 8 - 12, 2013 to be
published in the proceedings | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theoretical foundations of the quantum statistical approach to parton
distributions are reviewed together with the phenomenological motivations from
a few specific features of Deep Inelastic Scattering data. The chiral
properties of QCD lead to strong relations between quarks and antiquarks
distributions and automatically account for the flavor and helicity symmetry
breaking of the sea. We are able to describe both unpolarized and polarized
structure functions in terms of a small number of parameters. The extension to
include their transverse momentum dependence will be also briefly considered.
| [
{
"created": "Mon, 3 Feb 2014 21:01:48 GMT",
"version": "v1"
}
] | 2014-02-05 | [
[
"Soffer",
"Jacques",
""
],
[
"Bourrely",
"Claude",
""
],
[
"Buccella",
"Franco",
""
]
] | The theoretical foundations of the quantum statistical approach to parton distributions are reviewed together with the phenomenological motivations from a few specific features of Deep Inelastic Scattering data. The chiral properties of QCD lead to strong relations between quarks and antiquarks distributions and automatically account for the flavor and helicity symmetry breaking of the sea. We are able to describe both unpolarized and polarized structure functions in terms of a small number of parameters. The extension to include their transverse momentum dependence will be also briefly considered. |
2309.00452 | Timea Vitos | Davide Pagani, Timea Vitos, Marco Zaro | Improving NLO QCD event generators with high-energy EW corrections | 45 pages, 10 figures. This version matches the published one | null | null | TIF-UNIMI-2023-25, LU-TP-23-10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present a new approach for the combination of electroweak
(EW) corrections at high energies, the so-called EW Sudakov logarithms (EWSL),
and next-to-leading-order QCD predictions matched to parton-shower simulations
(NLO+PS). Our approach is based on a reweighting procedure of NLO+PS events. In
particular, both events with and without an extra hard emission from matrix
elements are consistently reweighted via the inclusion of the corresponding
EWSL contribution. We describe the technical details and the implementation in
the MadGraph5_aMC@NLO framework. Via a completely automated procedure, events
at this new level of accuracy can be obtained for a vast class of
hadroproduction processes. As a byproduct we provide results for
phenomenologically relevant physical distributions from top-quark pair and
Higgs boson associated production ($t\overline{t}H$) and from the associated
production of three $Z$ gauge bosons ($ZZZ$).
| [
{
"created": "Fri, 1 Sep 2023 13:30:34 GMT",
"version": "v1"
},
{
"created": "Wed, 22 May 2024 13:52:39 GMT",
"version": "v2"
}
] | 2024-05-24 | [
[
"Pagani",
"Davide",
""
],
[
"Vitos",
"Timea",
""
],
[
"Zaro",
"Marco",
""
]
] | In this work we present a new approach for the combination of electroweak (EW) corrections at high energies, the so-called EW Sudakov logarithms (EWSL), and next-to-leading-order QCD predictions matched to parton-shower simulations (NLO+PS). Our approach is based on a reweighting procedure of NLO+PS events. In particular, both events with and without an extra hard emission from matrix elements are consistently reweighted via the inclusion of the corresponding EWSL contribution. We describe the technical details and the implementation in the MadGraph5_aMC@NLO framework. Via a completely automated procedure, events at this new level of accuracy can be obtained for a vast class of hadroproduction processes. As a byproduct we provide results for phenomenologically relevant physical distributions from top-quark pair and Higgs boson associated production ($t\overline{t}H$) and from the associated production of three $Z$ gauge bosons ($ZZZ$). |
1402.4305 | Anton Artemyev | A. N. Artemyev, V. G. Serbo, A. Surzhykov | Double lepton pair production with electron capture in relativistic
heavy--ion collisions | 12 pages, 1 figure | null | 10.1140/epjc/s10052-014-2829-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a theoretical study of a double lepton pair production in
ultra--relativistic collision between two bare ions. Special emphasis is placed
to processes in which creation of (at least one) $e^+ e^-$ pair is accompanied
by the capture of an electron into a bound ionic state. To evaluate the
probability and cross section of these processes we employ two approaches based
on (i) the first--order perturbation theory and multipole expansion of Dirac
wavefunctions, and (ii) the equivalent photon approximation. With the help of
such approaches, detailed calculations are made for the creation of two
bound--free $e^+ e^-$ pairs as well as of bound--free $e^+ e^-$ and free--free
$\mu^+ \mu^-$ pairs in collisions of bare lead ions Pb$^{82+}$. The results of
the calculations indicate that observation of the double lepton processes may
become feasible at the LHC facility.
| [
{
"created": "Tue, 18 Feb 2014 11:43:16 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Artemyev",
"A. N.",
""
],
[
"Serbo",
"V. G.",
""
],
[
"Surzhykov",
"A.",
""
]
] | We present a theoretical study of a double lepton pair production in ultra--relativistic collision between two bare ions. Special emphasis is placed to processes in which creation of (at least one) $e^+ e^-$ pair is accompanied by the capture of an electron into a bound ionic state. To evaluate the probability and cross section of these processes we employ two approaches based on (i) the first--order perturbation theory and multipole expansion of Dirac wavefunctions, and (ii) the equivalent photon approximation. With the help of such approaches, detailed calculations are made for the creation of two bound--free $e^+ e^-$ pairs as well as of bound--free $e^+ e^-$ and free--free $\mu^+ \mu^-$ pairs in collisions of bare lead ions Pb$^{82+}$. The results of the calculations indicate that observation of the double lepton processes may become feasible at the LHC facility. |
hep-ph/0408017 | Peter A. Sturrock | P.A. Sturrock | Review of Methods of Power-Spectrum Analysis as Applied to
Super-Kamiokande Solar Neutrino Data | 21 pages, 25 figures | null | null | null | hep-ph | null | To help understand why different published analyses of the Super-Kamiokande
solar neutrino data arrive at different conclusions, we have applied six
different methods to a standardized problem. The key difference between the
various methods rests in the amount of information that each processes. A
Lomb-Scargle analysis that uses the mid times of the time bins and ignores
experimental error estimates uses the least information. A likelihood analysis
that uses the start times, end times, and mean live times, and takes account of
the experimental error estimates, makes the greatest use of the available
information. We carry out power-spectrum analyses of the Super-Kamiokande 5-day
solar neutrino data, using each method in turn, for a standard search band (0
to 50 yr-1). For each method, we also carry out a fixed number (10,000) of
Monte-Carlo simulations for the purpose of estimating the significance of the
leading peak in each power spectrum. We find that, with one exception, the
results of these calculations are compatible with those of previously published
analyses. (We are unable to replicate Koshio's recent results.) We find that
the significance of the peaks at 9.43 yr-1 and at 43.72 yr-1 increases
progressively as one incorporates more information into the analysis procedure.
| [
{
"created": "Mon, 2 Aug 2004 18:11:59 GMT",
"version": "v1"
}
] | 2017-12-20 | [
[
"Sturrock",
"P. A.",
""
]
] | To help understand why different published analyses of the Super-Kamiokande solar neutrino data arrive at different conclusions, we have applied six different methods to a standardized problem. The key difference between the various methods rests in the amount of information that each processes. A Lomb-Scargle analysis that uses the mid times of the time bins and ignores experimental error estimates uses the least information. A likelihood analysis that uses the start times, end times, and mean live times, and takes account of the experimental error estimates, makes the greatest use of the available information. We carry out power-spectrum analyses of the Super-Kamiokande 5-day solar neutrino data, using each method in turn, for a standard search band (0 to 50 yr-1). For each method, we also carry out a fixed number (10,000) of Monte-Carlo simulations for the purpose of estimating the significance of the leading peak in each power spectrum. We find that, with one exception, the results of these calculations are compatible with those of previously published analyses. (We are unable to replicate Koshio's recent results.) We find that the significance of the peaks at 9.43 yr-1 and at 43.72 yr-1 increases progressively as one incorporates more information into the analysis procedure. |
2307.00537 | Suruj Das | Debasish Borah, Suruj Jyoti Das, Rome Samanta | Imprint of inflationary gravitational waves and WIMP dark matter in
pulsar timing array data | 10 pages, 5 captioned figures, matches version accepted in JCAP | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Motivated by the recent release of new results from five different pulsar
timing array (PTA) experiments claiming to have found compelling evidence for
primordial gravitational waves (GW) at nano-Hz frequencies, we consider the
prospects of generating such a signal from inflationary blue-tilted tensor
power spectrum in a specific dark matter (DM) scenario dubbed as
$\textit{Miracle-less WIMP}$. While $\textit{Miracle-less WIMP}$, due to
insufficient interaction rate with the Standard Model (SM) bath gets thermally
overproduced, inflationary blue-tilted gravitational waves (BGW) in compliance
with PTA data, conflict cosmological observations if reheat temperature after
inflation is sufficiently high. Both these issues are circumvented with late
entropy dilution, bringing DM abundance within observational limits and
creating a doubly-peaked feature in the BGW spectrum consistent with
cosmological observations. The blue-tilted tail of the low-frequency peak can
fit NANOGrav 15 yr data, while other parts of the spectrum are within reach of
present and future GW experiments.
| [
{
"created": "Sun, 2 Jul 2023 10:34:16 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2024 14:06:43 GMT",
"version": "v2"
}
] | 2024-02-06 | [
[
"Borah",
"Debasish",
""
],
[
"Das",
"Suruj Jyoti",
""
],
[
"Samanta",
"Rome",
""
]
] | Motivated by the recent release of new results from five different pulsar timing array (PTA) experiments claiming to have found compelling evidence for primordial gravitational waves (GW) at nano-Hz frequencies, we consider the prospects of generating such a signal from inflationary blue-tilted tensor power spectrum in a specific dark matter (DM) scenario dubbed as $\textit{Miracle-less WIMP}$. While $\textit{Miracle-less WIMP}$, due to insufficient interaction rate with the Standard Model (SM) bath gets thermally overproduced, inflationary blue-tilted gravitational waves (BGW) in compliance with PTA data, conflict cosmological observations if reheat temperature after inflation is sufficiently high. Both these issues are circumvented with late entropy dilution, bringing DM abundance within observational limits and creating a doubly-peaked feature in the BGW spectrum consistent with cosmological observations. The blue-tilted tail of the low-frequency peak can fit NANOGrav 15 yr data, while other parts of the spectrum are within reach of present and future GW experiments. |
2210.14761 | Shakeel Ur Rahaman | Upalaparna Banerjee, Joydeep Chakrabortty, Christoph Englert, Shakeel
Ur Rahaman, and Michael Spannowsky | Integrating out heavy scalars with modified EOMs: matching computation
of dimension-eight SMEFT coefficients | 2 figures, 20 tables. Version to be published in Phys.Rev.D | null | 10.1103/PhysRevD.107.055007 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The shift in focus towards searches for physics beyond the Standard Model
(SM) employing model-independent Effective Field Theory (EFT) methods
necessitates a rigorous approach to matching to guarantee the validity of the
obtained results and constraints. The limits on the leading dimension-six EFT
effects can be rather inaccurate for LHC searches that suffer from large
uncertainties while exploring an extensive energy range. Similarly, precise
measurements can, in principle, test the subleading effects of the operator
expansion. In this work, we present an algorithmic approach to automatise
matching computations for dimension-eight operators for generic scalar
extensions with proper implementation of equations of motion. We devise a
step-by-step procedure to obtain the dimension-eight Wilson coefficients (WCs)
in a non-redundant basis to arrive at complete matching results. We apply this
formalism to a range of scalar extensions of the SM and provide tree-level and
loop-suppressed results. Finally, we discuss the relevance of the
dimension-eight operators for a range of phenomenological analyses,
particularly focusing on Higgs and electroweak physics.
| [
{
"created": "Wed, 26 Oct 2022 14:50:18 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Feb 2023 18:03:26 GMT",
"version": "v2"
}
] | 2023-03-29 | [
[
"Banerjee",
"Upalaparna",
""
],
[
"Chakrabortty",
"Joydeep",
""
],
[
"Englert",
"Christoph",
""
],
[
"Rahaman",
"Shakeel Ur",
""
],
[
"Spannowsky",
"Michael",
""
]
] | The shift in focus towards searches for physics beyond the Standard Model (SM) employing model-independent Effective Field Theory (EFT) methods necessitates a rigorous approach to matching to guarantee the validity of the obtained results and constraints. The limits on the leading dimension-six EFT effects can be rather inaccurate for LHC searches that suffer from large uncertainties while exploring an extensive energy range. Similarly, precise measurements can, in principle, test the subleading effects of the operator expansion. In this work, we present an algorithmic approach to automatise matching computations for dimension-eight operators for generic scalar extensions with proper implementation of equations of motion. We devise a step-by-step procedure to obtain the dimension-eight Wilson coefficients (WCs) in a non-redundant basis to arrive at complete matching results. We apply this formalism to a range of scalar extensions of the SM and provide tree-level and loop-suppressed results. Finally, we discuss the relevance of the dimension-eight operators for a range of phenomenological analyses, particularly focusing on Higgs and electroweak physics. |
2204.13092 | Xiang Liu | Dan Guo, Wei Chen, Hua-Xing Chen, Xiang Liu and Shi-Lin Zhu | Newly observed $a_0(1817)$ as the scaling point of constructing the
scalar meson spectroscopy | 8 pages, 4 figures. Accepted by Phys. Rev. D | Phys. Rev. D 105, 114014 (2022) | 10.1103/PhysRevD.105.114014 | null | hep-ph hep-ex hep-lat | http://creativecommons.org/publicdomain/zero/1.0/ | Stimulated by the newly observed $a_0(1817)$ by the BESIII Collaboration, we
find a perfect Regge trajectory composed of the $a_0(980)$, $a_0(1450)$, and
$a_0(1817)$, which leads us to categorize the $a_0(980)$, $a_0(1450)$, and
$a_0(1817)$ into the isovector scalar meson family. This scenario is supported
by their two-body Okubo-Zweig-Iizuka allowed strong decay behaviors. In this
scheme, we also predict the third radial excitation of the $a_0(980)$, which is
denoted as the $a_0(2115)$, accessible at future experiment as a direct test of
this assignment. We find another Regge trajectory which contains three
isoscalar scalar states $f_0(980)$, $X(1812)$, and $f_0(2100)$. We investigate
their two-body Okubo-Zweig-Iizuka allowed strong decay patterns, which are
roughly consistent with the experimental data. The $f_0(980)$, $X(1812)$, and
$f_0(2100)$ can be well grouped into the isoscalar scalar meson family. We want
to emphasize that these two Regge trajectories have a similar slope. In
summary, the present work provides a scheme of constructing the scalar meson
family based on these reported scalar states. The possibility of the
$f_0(1710)$ as the candidate of the scalar glueball cannot be excluded by the
observation of the $a_0(1817)$ since the $a_0(1817)$ is more suitable as the
isovector partner of the $X(1812)$.
| [
{
"created": "Wed, 27 Apr 2022 17:39:39 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2022 00:33:32 GMT",
"version": "v2"
}
] | 2022-06-16 | [
[
"Guo",
"Dan",
""
],
[
"Chen",
"Wei",
""
],
[
"Chen",
"Hua-Xing",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | Stimulated by the newly observed $a_0(1817)$ by the BESIII Collaboration, we find a perfect Regge trajectory composed of the $a_0(980)$, $a_0(1450)$, and $a_0(1817)$, which leads us to categorize the $a_0(980)$, $a_0(1450)$, and $a_0(1817)$ into the isovector scalar meson family. This scenario is supported by their two-body Okubo-Zweig-Iizuka allowed strong decay behaviors. In this scheme, we also predict the third radial excitation of the $a_0(980)$, which is denoted as the $a_0(2115)$, accessible at future experiment as a direct test of this assignment. We find another Regge trajectory which contains three isoscalar scalar states $f_0(980)$, $X(1812)$, and $f_0(2100)$. We investigate their two-body Okubo-Zweig-Iizuka allowed strong decay patterns, which are roughly consistent with the experimental data. The $f_0(980)$, $X(1812)$, and $f_0(2100)$ can be well grouped into the isoscalar scalar meson family. We want to emphasize that these two Regge trajectories have a similar slope. In summary, the present work provides a scheme of constructing the scalar meson family based on these reported scalar states. The possibility of the $f_0(1710)$ as the candidate of the scalar glueball cannot be excluded by the observation of the $a_0(1817)$ since the $a_0(1817)$ is more suitable as the isovector partner of the $X(1812)$. |
2010.14493 | Giovanni Pelliccioli | Lorenzo Magnea, Giovanni Pelliccioli, Chiara Signorile-Signorile,
Paolo Torrielli, Sandro Uccirati | Analytic integration of soft and collinear radiation in factorised QCD
cross sections at NNLO | 42 pages, matches version published in JHEP | null | 10.1007/JHEP02(2021)037 | P3H-20-061, TTP20-036, CERN-TH-2020-178 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of local analytic sector subtraction, we present the
full analytic integration of double-real and real-virtual local infrared
counterterms that enter NNLO QCD computations with any number of massless
final-state partons. We show that a careful choice of phase-space mappings
leads to simple analytic results, including non-singular terms, that can be
obtained with conventional integration techniques.
| [
{
"created": "Tue, 27 Oct 2020 17:52:44 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 2020 15:22:19 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Jan 2022 16:40:51 GMT",
"version": "v3"
}
] | 2022-01-17 | [
[
"Magnea",
"Lorenzo",
""
],
[
"Pelliccioli",
"Giovanni",
""
],
[
"Signorile-Signorile",
"Chiara",
""
],
[
"Torrielli",
"Paolo",
""
],
[
"Uccirati",
"Sandro",
""
]
] | Within the framework of local analytic sector subtraction, we present the full analytic integration of double-real and real-virtual local infrared counterterms that enter NNLO QCD computations with any number of massless final-state partons. We show that a careful choice of phase-space mappings leads to simple analytic results, including non-singular terms, that can be obtained with conventional integration techniques. |
2006.02239 | Miguel G. Folgado | Miguel G. Folgado, Andrea Donini and Nuria Rius | Spin-dependence of Gravity-mediated Dark Matter in Warped
Extra-Dimensions | 17 pages, 4 figures. Published version | Eur.Phys.J.C 81 (2021) 3, 197 | 10.1140/epjc/s10052-021-08989-x | FTUV-20-0526.3151, IFIC/20-21 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spin-dependence of Dark Matter (DM) particles which interact
gravitationally with the Standard Model (SM) in an extra-dimensional
Randall-Sundrum scenario. We assume that both the Dark Matter and the Standard
Model are confined to the TeV (Infra-red) brane and only interact via
gravitational mediators, namely Kaluza-Klein gravitons and the radion. We
analyze the different DM annihilation channels and find that it is possible to
achieve the presently observed relic abundance of Dark Matter, $\Omega_{\rm
DM}$, within the freeze-out mechanism for DM particles of spin 0, 1/2 and 1. We
study the region of the model parameter space for which $\Omega_{\rm DM}$ is
achieved and compare it with the different experimental and theoretical bounds.
We also consider the impact of the radion in the phenomenology. We find that,
for DM particles mass $m_{\rm DM} \in [1,15]$ TeV, most of the parameter space
is excluded by the current constraints or will be excluded by the LHC Run III
or by the LHC upgrade, the HL-LHC. The presence of the radion does not modify
significantly the non-excluded region. The observed DM relic abundance can
still be achieved for DM masses $m_{\rm } \in [4,15]$ TeV and $m_{G_1} < 10$
TeV for scalar and vector boson Dark Matter. On the other hand, for spin 1/2
fermion Dark Matter, only a tiny region with $m_{\rm DM } \in [4, 15]$ TeV,
$m_{G_1} \in [5,10]$ TeV and $\Lambda > m_{G_1}$ is compatible with theoretical
and experimental bounds.
| [
{
"created": "Mon, 1 Jun 2020 18:00:08 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2021 16:02:43 GMT",
"version": "v2"
}
] | 2021-03-12 | [
[
"Folgado",
"Miguel G.",
""
],
[
"Donini",
"Andrea",
""
],
[
"Rius",
"Nuria",
""
]
] | We study the spin-dependence of Dark Matter (DM) particles which interact gravitationally with the Standard Model (SM) in an extra-dimensional Randall-Sundrum scenario. We assume that both the Dark Matter and the Standard Model are confined to the TeV (Infra-red) brane and only interact via gravitational mediators, namely Kaluza-Klein gravitons and the radion. We analyze the different DM annihilation channels and find that it is possible to achieve the presently observed relic abundance of Dark Matter, $\Omega_{\rm DM}$, within the freeze-out mechanism for DM particles of spin 0, 1/2 and 1. We study the region of the model parameter space for which $\Omega_{\rm DM}$ is achieved and compare it with the different experimental and theoretical bounds. We also consider the impact of the radion in the phenomenology. We find that, for DM particles mass $m_{\rm DM} \in [1,15]$ TeV, most of the parameter space is excluded by the current constraints or will be excluded by the LHC Run III or by the LHC upgrade, the HL-LHC. The presence of the radion does not modify significantly the non-excluded region. The observed DM relic abundance can still be achieved for DM masses $m_{\rm } \in [4,15]$ TeV and $m_{G_1} < 10$ TeV for scalar and vector boson Dark Matter. On the other hand, for spin 1/2 fermion Dark Matter, only a tiny region with $m_{\rm DM } \in [4, 15]$ TeV, $m_{G_1} \in [5,10]$ TeV and $\Lambda > m_{G_1}$ is compatible with theoretical and experimental bounds. |
2003.08948 | Hidetoshi Taya | Hidetoshi Taya | Dynamically assisted Schwinger mechanism and chirality production in
parallel electromagnetic field | 17 pages, 5 figures; v2: references updated, typos corrected, to be
published in PRR | Phys. Rev. Research 2, 023257 (2020) | 10.1103/PhysRevResearch.2.023257 | null | hep-ph hep-th nucl-th physics.plasm-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study particle and chirality production from the vacuum in the presence of
a slow strong parallel electromagnetic field superimposed by a fast weak
perturbative electromagnetic field. We derive an analytical formula for the
particle and chirality production number based on the perturbation theory in
the Furry picture. With the formula, we analytically discuss the interplay and
dynamical assistance between the Schwinger mechanism and one-photon pair
production and clarify effects of a parallel slow strong magnetic field. We
also show that the dynamical assistance can significantly enhance chirality
production, and that a sizable amount of chirality can be produced even for
massive particles. Phenomenological applications including heavy-ion collisions
and intense laser experiments are also discussed.
| [
{
"created": "Thu, 19 Mar 2020 18:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 21 May 2020 20:21:23 GMT",
"version": "v2"
}
] | 2020-07-01 | [
[
"Taya",
"Hidetoshi",
""
]
] | We study particle and chirality production from the vacuum in the presence of a slow strong parallel electromagnetic field superimposed by a fast weak perturbative electromagnetic field. We derive an analytical formula for the particle and chirality production number based on the perturbation theory in the Furry picture. With the formula, we analytically discuss the interplay and dynamical assistance between the Schwinger mechanism and one-photon pair production and clarify effects of a parallel slow strong magnetic field. We also show that the dynamical assistance can significantly enhance chirality production, and that a sizable amount of chirality can be produced even for massive particles. Phenomenological applications including heavy-ion collisions and intense laser experiments are also discussed. |
0807.3033 | Edward Shuryak | Edward Shuryak | Physics of Strongly coupled Quark-Gluon Plasma | v2 is a version accepted for publication. It includes results of
correspondence with people after v1 and journal referees, few editorial
changes, few new points and several new references | Prog.Part.Nucl.Phys.62:48-101,2009 | 10.1016/j.ppnp.2008.09.001 | null | hep-ph hep-th nucl-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | This review cover our current understanding of strongly coupled Quark-Gluon
Plasma (sQGP), especially theoretical progress in (i) explaining the RHIC data
by hydrodynamics, (ii) describing lattice data using electric-magnetic duality;
(iii) understanding of gauge-string duality known as AdS/CFT and its
application for "conformal" plasma. In view of interdisciplinary nature of the
subject, we include brief introduction into several topics "for pedestrians".
Some fundamental questions addressed are: Why is sQGP such a good liquid? What
is the nature of (de)confinement and what do we know about ''magnetic'' objects
creating it? Do they play any important role in sQGP physics? Can we understand
the AdS/CFT predictions, from the gauge theory side? Can they be tested
experimentally? Can AdS/CFT duality help us understand rapid
equilibration/entropy production? Can we work out a complete dynamical "gravity
dual" to heavy ion collisions?
| [
{
"created": "Fri, 18 Jul 2008 19:09:38 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Sep 2008 14:05:33 GMT",
"version": "v2"
}
] | 2010-04-30 | [
[
"Shuryak",
"Edward",
""
]
] | This review cover our current understanding of strongly coupled Quark-Gluon Plasma (sQGP), especially theoretical progress in (i) explaining the RHIC data by hydrodynamics, (ii) describing lattice data using electric-magnetic duality; (iii) understanding of gauge-string duality known as AdS/CFT and its application for "conformal" plasma. In view of interdisciplinary nature of the subject, we include brief introduction into several topics "for pedestrians". Some fundamental questions addressed are: Why is sQGP such a good liquid? What is the nature of (de)confinement and what do we know about ''magnetic'' objects creating it? Do they play any important role in sQGP physics? Can we understand the AdS/CFT predictions, from the gauge theory side? Can they be tested experimentally? Can AdS/CFT duality help us understand rapid equilibration/entropy production? Can we work out a complete dynamical "gravity dual" to heavy ion collisions? |
hep-ph/9401345 | Martin John Savage | Martin J. Savage | Magnetic Moment of the $\Lambda_c$, $\Xi_{c1}^+$ and $\Xi_{c1}^0$ | 10 pages, 1 uuencoded figure included, uses harvmac and epsf, CMU-HEP
94-06 | Phys.Lett. B326 (1994) 303-306 | 10.1016/0370-2693(94)91326-9 | null | hep-ph | null | The magnetic moment of the $\Lambda_c$, $\Xi_{c1}^+$ and $\Xi_{c1}^0$ vanish
when the charm quark mass is taken to infinity because the light degrees of
freedom are in a spin zero configuration. The heavy quark spin-symmetry
violating contribution from the light degrees of freedom starts at order
$1/m_c$, the same order as the contribution from the heavy charm quark. We
compute the leading long-distance contribution to the magnetic moments from the
spin-symmetry breaking $\Sigma_c^*-\Sigma_c $ mass splitting in chiral
perturbation theory. These are nonanalytic in the pion mass and arise from
calculable one-loop graphs. Further, the difference between the magnetic
moments of the charged charmed baryons is independent of the charm quark mass
and of the subleading local counterterm.
| [
{
"created": "Thu, 27 Jan 1994 21:14:38 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Savage",
"Martin J.",
""
]
] | The magnetic moment of the $\Lambda_c$, $\Xi_{c1}^+$ and $\Xi_{c1}^0$ vanish when the charm quark mass is taken to infinity because the light degrees of freedom are in a spin zero configuration. The heavy quark spin-symmetry violating contribution from the light degrees of freedom starts at order $1/m_c$, the same order as the contribution from the heavy charm quark. We compute the leading long-distance contribution to the magnetic moments from the spin-symmetry breaking $\Sigma_c^*-\Sigma_c $ mass splitting in chiral perturbation theory. These are nonanalytic in the pion mass and arise from calculable one-loop graphs. Further, the difference between the magnetic moments of the charged charmed baryons is independent of the charm quark mass and of the subleading local counterterm. |
hep-ph/0605206 | Thomas D. Cohen | Thomas D. Cohen | Effective chiral restoration in the hadronic spectrum and QCD | null | Nucl.Phys. A775 (2006) 89-101 | 10.1016/j.nuclphysa.2006.06.015 | null | hep-ph | null | Effective chiral restoration in the hadronic spectrum has been conjectured as
an explanation of multiplets of nearly degenerate seen in highly excited
hadrons. The conjecture depends on the states being insensitive to the dynamics
of spontaneous chiral symmetry breaking. A key question is whether this concept
is well defined in QCD. This paper shows that it is by means of an explicit
formal construction. This construction allows one to characterize this
sensitivity for any observable calculable in QCD in Euclidean space via a
functional integral. The construction depends on a generalization of the
Banks-Casher theorem. It exploits the fact that {\it all} dynamics sensitive to
spontaneous chiral symmetry breaking observables in correlation functions arise
from fermion modes of zero virtuality (in the infinite volume limit), while
such modes make {\it no} contribution to any of the dynamics which preserves
chiral symmetry. In principle this construction can be implemented in lattice
QCD. The prospect of a practical lattice implementation yielding a direct
numerical test of the concept of effective chiral restoration is discussed.
| [
{
"created": "Thu, 18 May 2006 14:47:08 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Cohen",
"Thomas D.",
""
]
] | Effective chiral restoration in the hadronic spectrum has been conjectured as an explanation of multiplets of nearly degenerate seen in highly excited hadrons. The conjecture depends on the states being insensitive to the dynamics of spontaneous chiral symmetry breaking. A key question is whether this concept is well defined in QCD. This paper shows that it is by means of an explicit formal construction. This construction allows one to characterize this sensitivity for any observable calculable in QCD in Euclidean space via a functional integral. The construction depends on a generalization of the Banks-Casher theorem. It exploits the fact that {\it all} dynamics sensitive to spontaneous chiral symmetry breaking observables in correlation functions arise from fermion modes of zero virtuality (in the infinite volume limit), while such modes make {\it no} contribution to any of the dynamics which preserves chiral symmetry. In principle this construction can be implemented in lattice QCD. The prospect of a practical lattice implementation yielding a direct numerical test of the concept of effective chiral restoration is discussed. |
hep-ph/9909254 | Stefano Rigolin | A. Donini (1), M.B. Gavela (1), P. Hernandez (2) and S. Rigolin (1) -
((1) Universidad Autonoma de Madrid, (2) CERN) | Neutrino mixing and CP-violation | 22 pages, LaTeX2e, 17 eps files, use package epsfig | Nucl.Phys. B574 (2000) 23-42 | 10.1016/S0550-3213(00)00029-8 | CERN-TH/99-252, FTUAM-99-25, FTUV/99-59, IFIC/99-62 | hep-ph | null | The prospects of measuring the leptonic angles and CP-odd phases at a
neutrino factory are discussed in two scenarios: 1) three active neutrinos as
indicated by the present ensemble of atmospheric plus solar data; 2) three
active plus one sterile neutrino when the LSND signal is also taken into
account. For the latter we develop one and two mass dominance approximations.
The appearance of wrong sign muons in long baseline experiments and tau leptons
in short baseline ones provides the best tests of CP-violation in scenarios 1)
and 2), respectively.
| [
{
"created": "Sun, 5 Sep 1999 22:38:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Donini",
"A.",
"",
"Universidad Autonoma de Madrid"
],
[
"Gavela",
"M. B.",
"",
"Universidad Autonoma de Madrid"
],
[
"Hernandez",
"P.",
"",
"CERN"
],
[
"Rigolin",
"S.",
"",
"Universidad Autonoma de Madrid"
],
[
"-",
"",
... | The prospects of measuring the leptonic angles and CP-odd phases at a neutrino factory are discussed in two scenarios: 1) three active neutrinos as indicated by the present ensemble of atmospheric plus solar data; 2) three active plus one sterile neutrino when the LSND signal is also taken into account. For the latter we develop one and two mass dominance approximations. The appearance of wrong sign muons in long baseline experiments and tau leptons in short baseline ones provides the best tests of CP-violation in scenarios 1) and 2), respectively. |
0709.3825 | Maxim Pospelov | Keith A. Olive and Maxim Pospelov | Environmental Dependence of Masses and Coupling Constants | 20 pages, no figures, references added, minor editorial changes | Phys.Rev.D77:043524,2008 | 10.1103/PhysRevD.77.043524 | UMN-TH-2618/07 | hep-ph | null | We construct a class of scalar field models coupled to matter that lead to
the dependence of masses and coupling constants on the ambient matter density.
Such models predict a deviation of couplings measured on the Earth from values
determined in low-density astrophysical environments, but do not necessarily
require the evolution of coupling constants with the redshift in the recent
cosmological past. Additional laboratory and astrophysical tests of \Delta
\alpha and \Delta(m_p/m_e) as functions of the ambient matter density are
warranted.
| [
{
"created": "Mon, 24 Sep 2007 19:21:58 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Oct 2007 21:35:54 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Jan 2008 07:21:10 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Olive",
"Keith A.",
""
],
[
"Pospelov",
"Maxim",
""
]
] | We construct a class of scalar field models coupled to matter that lead to the dependence of masses and coupling constants on the ambient matter density. Such models predict a deviation of couplings measured on the Earth from values determined in low-density astrophysical environments, but do not necessarily require the evolution of coupling constants with the redshift in the recent cosmological past. Additional laboratory and astrophysical tests of \Delta \alpha and \Delta(m_p/m_e) as functions of the ambient matter density are warranted. |
hep-ph/9503283 | Ed Stoeffhaas | M. Drees | Radiative $b$ Decays and the Detection of Supersymmetric Dark Matter | To appear in Proceedings of Beyond the Standard Model IV, Lake Tahoe,
California, Dec. 1994. Latex, 6 pages, uses epsf.sty to place postscript
figures (included). Compressed postscript version with figures available at
ftp://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-874.ps.Z or at
http://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-874.ps.Z | null | null | MADPH-95-874 | hep-ph | null | The upper bond on the branching ratio for $b\to s\gamma$ decays implies a
stringent lower bound on the mass of the pseudoscalar Higgs boson of the MSSM
if sparticles are heavy. This leads to an upper bound on the expected event
rate in experiments searching for heavy supersymmetric dark matter. Scenarios
with lighter sparticle spectrum and light pseudoscalar Higgs boson are still
possible, but only if $\mu < 0$, which again implies a small LSP counting rate.
| [
{
"created": "Thu, 9 Mar 1995 21:01:36 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Drees",
"M.",
""
]
] | The upper bond on the branching ratio for $b\to s\gamma$ decays implies a stringent lower bound on the mass of the pseudoscalar Higgs boson of the MSSM if sparticles are heavy. This leads to an upper bound on the expected event rate in experiments searching for heavy supersymmetric dark matter. Scenarios with lighter sparticle spectrum and light pseudoscalar Higgs boson are still possible, but only if $\mu < 0$, which again implies a small LSP counting rate. |
hep-ph/0701222 | Raphael Granier de Cassagnac | Rapha\"el Granier de Cassagnac | A d-Au data-driven prediction of cold nuclear matter effects on $J/\psi$
production in Au-Au collisions at RHIC | 4 pages, 5 figures, to appear in the proceedings of the 19th
International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions,
Quark Matter 06, Shanghai, Nov. 2006 (revised version after referee report) | J.Phys.G34:S955-958,2007 | 10.1088/0954-3899/34/8/S134 | null | hep-ph | null | I present here a new Glauber-inspired approach to derive normal cold nuclear
matter effects on $J/\psi$ production in Au-Au collisions. In an as much as
possible model-independent way, it extrapolates the centrality dependent yields
from d-Au to Au-Au collisions. I then compare to the new Au-Au measurements
shown by the PHENIX experiment in this conference. In the most central
collisions, $J/\psi$ survival probabilities beyond cold nuclear matter effects
are found to be $44\pm23%$ at forward ($y=1.7$) and $25\pm12%$ at mid ($y=0$)
rapidities.
| [
{
"created": "Fri, 26 Jan 2007 11:16:55 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Feb 2007 09:37:20 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"de Cassagnac",
"Raphaël Granier",
""
]
] | I present here a new Glauber-inspired approach to derive normal cold nuclear matter effects on $J/\psi$ production in Au-Au collisions. In an as much as possible model-independent way, it extrapolates the centrality dependent yields from d-Au to Au-Au collisions. I then compare to the new Au-Au measurements shown by the PHENIX experiment in this conference. In the most central collisions, $J/\psi$ survival probabilities beyond cold nuclear matter effects are found to be $44\pm23%$ at forward ($y=1.7$) and $25\pm12%$ at mid ($y=0$) rapidities. |
hep-ph/0503283 | Stephen Parke | Hiroshi Nunokawa (PUC), Stephen Parke (Fermilab), Renata Zukanovich
Funchal (USP) | Another possible way to determine the Neutrino Mass Hierarchy | 12 pages, 3 postscript figures, latex | Phys.Rev.D72:013009,2005 | 10.1103/PhysRevD.72.013009 | Fermilab-Pub-05-041-T | hep-ph hep-ex | null | We show that by combining high precision measurements of the atmospheric
delta m^2 in both the electron and muon neutrino (or anti-neutrino)
disappearance channels one can determine the neutrino mass hierarchy. The
required precision is a very challenging fraction of one per cent for both
measurements. At even higher precision, sensitivity to the cosine of the CP
violating phase is also possible. This method for determining the mass
hierarchy of the neutrino sector does not depend on matter effects.
| [
{
"created": "Tue, 29 Mar 2005 20:43:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nunokawa",
"Hiroshi",
"",
"PUC"
],
[
"Parke",
"Stephen",
"",
"Fermilab"
],
[
"Funchal",
"Renata Zukanovich",
"",
"USP"
]
] | We show that by combining high precision measurements of the atmospheric delta m^2 in both the electron and muon neutrino (or anti-neutrino) disappearance channels one can determine the neutrino mass hierarchy. The required precision is a very challenging fraction of one per cent for both measurements. At even higher precision, sensitivity to the cosine of the CP violating phase is also possible. This method for determining the mass hierarchy of the neutrino sector does not depend on matter effects. |
1912.02772 | Marco Drewes | Gilles Buldgen, Marco Drewes, Jin U Kang, Ui Ri Mun | General Markovian Equation for Scalar Fields in a Slowly Evolving
Background | 20 pages, 2 figures; version accepted in JCAP | JCAP05(2022)039 | 10.1088/1475-7516/2022/05/039 | CP3-19-54 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general and model-independent method to obtain an effective
Markovian quantum kinetic equation for the expectation value of a slowly
evolving scalar field in an adiabatically evolving background from first
principles of nonequilibrium quantum field theory. The method requires almost
no assumptions about the field's interactions and the composition of the
background, except that 1) the coupling constants shall be small enough for
perturbation theory to be applicable, 2) there is a clear separation between
microphysical time scales and the rate at which bulk properties change, and 3)
higher time derivatives of the field remain small. The resulting Markovian
equation of motion is expressed in terms of an effective potential and friction
coefficients. Motivated by cosmological applications we focus on spatially
homogeneous and isotropic systems, but the approach could also be applied to
spatial gradients.
| [
{
"created": "Thu, 5 Dec 2019 18:07:30 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jan 2022 09:16:27 GMT",
"version": "v2"
},
{
"created": "Tue, 24 May 2022 14:04:45 GMT",
"version": "v3"
}
] | 2022-05-25 | [
[
"Buldgen",
"Gilles",
""
],
[
"Drewes",
"Marco",
""
],
[
"Kang",
"Jin U",
""
],
[
"Mun",
"Ui Ri",
""
]
] | We present a general and model-independent method to obtain an effective Markovian quantum kinetic equation for the expectation value of a slowly evolving scalar field in an adiabatically evolving background from first principles of nonequilibrium quantum field theory. The method requires almost no assumptions about the field's interactions and the composition of the background, except that 1) the coupling constants shall be small enough for perturbation theory to be applicable, 2) there is a clear separation between microphysical time scales and the rate at which bulk properties change, and 3) higher time derivatives of the field remain small. The resulting Markovian equation of motion is expressed in terms of an effective potential and friction coefficients. Motivated by cosmological applications we focus on spatially homogeneous and isotropic systems, but the approach could also be applied to spatial gradients. |
hep-ph/0010331 | Jan Kalinowski | Wojciech Krolikowski | Neutrino texture dominated by Majorana lefthanded mass matrix | 10 pages, latex, no figures, a misprint in the author's name and a
numerical error in formulae for the mass matrix are corrected | null | null | IFT/00-28 | hep-ph | null | A form of mixing matrix for three active and three sterile, conventional
Majorana neutrinos is proposed. Its Majorana lefthanded part arises from the
popular bimaximal mixing matrix for three active neutrinos that works
satisfactorily in solar and atmospheric experiments if the LSND effect is
ignored. One of three sterile neutrinos, effective in the Majorana righthanded
and Dirac parts of the proposed mixing matrix, is responsible for the possible
LSND effect by inducing one of three extra neutrino mass states to exist
actively. The corresponding form of neutrino mass matrix is derived. Also, the
respective neutrino oscillation probabilities are calculated.
| [
{
"created": "Mon, 30 Oct 2000 09:46:04 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Nov 2000 12:57:02 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Krolikowski",
"Wojciech",
""
]
] | A form of mixing matrix for three active and three sterile, conventional Majorana neutrinos is proposed. Its Majorana lefthanded part arises from the popular bimaximal mixing matrix for three active neutrinos that works satisfactorily in solar and atmospheric experiments if the LSND effect is ignored. One of three sterile neutrinos, effective in the Majorana righthanded and Dirac parts of the proposed mixing matrix, is responsible for the possible LSND effect by inducing one of three extra neutrino mass states to exist actively. The corresponding form of neutrino mass matrix is derived. Also, the respective neutrino oscillation probabilities are calculated. |
2104.05013 | Siamak Sadat Gousheh | S. Abbaslu, S. Rostam Zadeh, A. Rezaei and S. S. Gousheh | The effects of non-helical component of hypermagnetic field on the
evolution of the matter-antimatter asymmetry, vorticity, and hypermagnetic
field | 33 pages, 5 figures | Phys. Rev. D 104, 056028 (2021) | 10.1103/PhysRevD.104.056028 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the evolution of the matter-antimatter asymmetry ({\eta}), the
vorticity, and the hypermagnetic field in the symmetric phase of the early
Universe, and in the temperature range 100 GeV < T < 10 TeV. We assume a
configuration for the hypermagnetic field which includes both helical and
non-helical (Bz) components. Consequently, the hypermagnetic field and the
fluid vorticity can directly affect each other, the manifestations of which we
explore in three scenarios. In the first scenario, we show that in the presence
of a small vorticity and a large {\eta}eR, helicity can be generated and
amplified for an initially strong Bz. The generation of the helical seed is due
to the chiral vortical effect (CVE) and/or the advection term, while its growth
is mainly due to the chiral magnetic effect (CME) which leads to the production
of the baryon asymmetry, as well. The vorticity saturates to a nonzero value
which depends on Bz, even in the presence of the viscosity, due to the
back-reaction of Bz on the plasma. Increasing the initial vorticity, makes the
values of the helicity, {\eta}s, and vorticity reach their saturation curves
sooner, but does not change their final values at the onset of the electroweak
phase transition. The second scenario is similar to the first except we assume
that all initial {\eta}s are zero. We find that much higher initial vorticity
is required for the generation process. In the third scenario, we show that in
the presence of only a strong hypermagnetic field, {\eta}s and vorticity can be
generated and amplified. Increasing the initial helicity, increases the final
{\eta}s and vorticity. We find that although the presence of a nonzero initial
Bz is necessary in all three scenarios, its increase only increases the final
values of vorticity.
| [
{
"created": "Sun, 11 Apr 2021 13:35:54 GMT",
"version": "v1"
}
] | 2021-10-04 | [
[
"Abbaslu",
"S.",
""
],
[
"Zadeh",
"S. Rostam",
""
],
[
"Rezaei",
"A.",
""
],
[
"Gousheh",
"S. S.",
""
]
] | We study the evolution of the matter-antimatter asymmetry ({\eta}), the vorticity, and the hypermagnetic field in the symmetric phase of the early Universe, and in the temperature range 100 GeV < T < 10 TeV. We assume a configuration for the hypermagnetic field which includes both helical and non-helical (Bz) components. Consequently, the hypermagnetic field and the fluid vorticity can directly affect each other, the manifestations of which we explore in three scenarios. In the first scenario, we show that in the presence of a small vorticity and a large {\eta}eR, helicity can be generated and amplified for an initially strong Bz. The generation of the helical seed is due to the chiral vortical effect (CVE) and/or the advection term, while its growth is mainly due to the chiral magnetic effect (CME) which leads to the production of the baryon asymmetry, as well. The vorticity saturates to a nonzero value which depends on Bz, even in the presence of the viscosity, due to the back-reaction of Bz on the plasma. Increasing the initial vorticity, makes the values of the helicity, {\eta}s, and vorticity reach their saturation curves sooner, but does not change their final values at the onset of the electroweak phase transition. The second scenario is similar to the first except we assume that all initial {\eta}s are zero. We find that much higher initial vorticity is required for the generation process. In the third scenario, we show that in the presence of only a strong hypermagnetic field, {\eta}s and vorticity can be generated and amplified. Increasing the initial helicity, increases the final {\eta}s and vorticity. We find that although the presence of a nonzero initial Bz is necessary in all three scenarios, its increase only increases the final values of vorticity. |
1909.02039 | Eugenio Megias | E. Megias, E. Ruiz Arriola, L.L. Salcedo | Quark-diquark models and baryonic fluctuations in QCD | 6 pages, 5 figures. Talk given by E.Megias at the 22th International
Conference in Quantum Chromodynamics (QCD 19), Montpellier, France, 2 - 5 Jul
2019 | null | null | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the baryonic fluctuations of electric charge, baryon number and
strangeness, by considering a realization of the Hadron Resonance Gas model in
the light flavor sector of QCD. We elaborate on the idea that the
susceptibilities can be saturated with excited baryonic states with a
quark-diquark structure with a linearly confining interaction identical up to a
constant to the quark-antiquark potential, $V_{qD}^\prime(r) = V_{q{\bar
q}}^\prime(r)$. We obtain an overall good agreement with the spectrum obtained
with other quark models and with lattice data for the fluctuations.
| [
{
"created": "Wed, 4 Sep 2019 18:28:59 GMT",
"version": "v1"
}
] | 2019-09-06 | [
[
"Megias",
"E.",
""
],
[
"Arriola",
"E. Ruiz",
""
],
[
"Salcedo",
"L. L.",
""
]
] | We study the baryonic fluctuations of electric charge, baryon number and strangeness, by considering a realization of the Hadron Resonance Gas model in the light flavor sector of QCD. We elaborate on the idea that the susceptibilities can be saturated with excited baryonic states with a quark-diquark structure with a linearly confining interaction identical up to a constant to the quark-antiquark potential, $V_{qD}^\prime(r) = V_{q{\bar q}}^\prime(r)$. We obtain an overall good agreement with the spectrum obtained with other quark models and with lattice data for the fluctuations. |
1005.5688 | Tomasz Partyka | Tomasz L. Partyka | Non-uniform chiral phase studied within the Polyakov NJL model | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider how does the introduction of a Polyakov loop affects the
spatially inhomogeneous quark condensate. The primary result of our work is
that the existence of the spatially non-uniform chiral phase is confirmed
within the Polyakov NJL model in a chiral limit. These findings are obtained
both in a 3d-cutoff and in a Schwinger (proper time) regularization schemes.
| [
{
"created": "Mon, 31 May 2010 14:24:13 GMT",
"version": "v1"
}
] | 2010-06-01 | [
[
"Partyka",
"Tomasz L.",
""
]
] | We consider how does the introduction of a Polyakov loop affects the spatially inhomogeneous quark condensate. The primary result of our work is that the existence of the spatially non-uniform chiral phase is confirmed within the Polyakov NJL model in a chiral limit. These findings are obtained both in a 3d-cutoff and in a Schwinger (proper time) regularization schemes. |
hep-ph/9409243 | Frank Cuypers | Frank Cuypers and Saurabh Rindani | Top Quarks and $CP$ Violation in Polarized $e^+e^-$ Collisions | 11 pages, MPI-PhT/94-54 | Phys.Lett.B343:333-338,1995 | 10.1016/0370-2693(94)01414-8 | null | hep-ph | null | Electroweak dipole moments of the top quark are conjectured and their effect
in polarized $e^+e^-$ collisions is examined for the expectation values of two
different $CP$-odd observables. One of these observables probes the real part
of the dipole moments whereas the other probes their imaginary part. It turns
out that varying the polarization of the electron beam substantially enhances
the resolving power of the experiment. PostScript version: preprints/mpi9454.ps
from gluon.hep.physik.uni-muenchen.de
| [
{
"created": "Wed, 7 Sep 1994 09:19:06 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Cuypers",
"Frank",
""
],
[
"Rindani",
"Saurabh",
""
]
] | Electroweak dipole moments of the top quark are conjectured and their effect in polarized $e^+e^-$ collisions is examined for the expectation values of two different $CP$-odd observables. One of these observables probes the real part of the dipole moments whereas the other probes their imaginary part. It turns out that varying the polarization of the electron beam substantially enhances the resolving power of the experiment. PostScript version: preprints/mpi9454.ps from gluon.hep.physik.uni-muenchen.de |
1106.2182 | Andrew Larkoski | Andrew J. Larkoski, Michael E. Peskin | Antenna Splitting Functions for Massive Particles | 33 pages, 2 figures | Phys.Rev.D84:034034,2011 | 10.1103/PhysRevD.84.034034 | SLAC--PUB--14481 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An antenna shower is a parton shower in which the basic move is a
color-coherent 2-to-3 parton splitting process. In this paper, we give compact
forms for the spin-dependent antenna splitting functions involving massive
partons of spin 0 and spin 1/2.
| [
{
"created": "Fri, 10 Jun 2011 22:27:29 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jul 2011 00:43:16 GMT",
"version": "v2"
}
] | 2011-09-12 | [
[
"Larkoski",
"Andrew J.",
""
],
[
"Peskin",
"Michael E.",
""
]
] | An antenna shower is a parton shower in which the basic move is a color-coherent 2-to-3 parton splitting process. In this paper, we give compact forms for the spin-dependent antenna splitting functions involving massive partons of spin 0 and spin 1/2. |
hep-ph/0105035 | Martin Einhorn | Martin B. Einhorn, Jose Wudka | Effective Beta-Functions for Effective Field Theory | 13 pages, LaTeX (requires JHEP class). Version 3: additional
references and a slight expansion of Sections 3 and 5. No substantive changes | JHEP 0108:025,2001 | 10.1088/1126-6708/2001/08/025 | MCTP-01-20; UCRHEP-T310 | hep-ph hep-th | null | We consider the problem of determining the beta-functions for any reduced
effective field theory. Even though not all the Green's functions of a reduced
effective field theory are renormalizable, unlike the full effective field
theory, certain effective beta- functions for the reduced set of couplings may
be calculated without having to introduce vertices in the Feynman rules for
redundant operators. These effective beta-functions suffice to apply the
renormalization group equation to any transition amplitude (i.e., S- matrix
element), thereby rendering reduced effective field theories no more cumbersome
than traditionally renormalizable field theories. These effective
beta-functions may equally be regarded as the running of couplings for a
particular redefinition of the fields.
| [
{
"created": "Thu, 3 May 2001 22:53:51 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2001 01:52:41 GMT",
"version": "v2"
},
{
"created": "Sat, 23 Jun 2001 13:39:41 GMT",
"version": "v3"
}
] | 2010-02-03 | [
[
"Einhorn",
"Martin B.",
""
],
[
"Wudka",
"Jose",
""
]
] | We consider the problem of determining the beta-functions for any reduced effective field theory. Even though not all the Green's functions of a reduced effective field theory are renormalizable, unlike the full effective field theory, certain effective beta- functions for the reduced set of couplings may be calculated without having to introduce vertices in the Feynman rules for redundant operators. These effective beta-functions suffice to apply the renormalization group equation to any transition amplitude (i.e., S- matrix element), thereby rendering reduced effective field theories no more cumbersome than traditionally renormalizable field theories. These effective beta-functions may equally be regarded as the running of couplings for a particular redefinition of the fields. |
1204.1737 | Robert Fleischer | Kristof De Bruyn, Robert Fleischer, Robert Knegjens, Patrick
Koppenburg, Marcel Merk, Antonio Pellegrino, Niels Tuning | Probing New Physics via the $B^0_s\to \mu^+\mu^-$ Effective Lifetime | 6 pages, 2 figures, title matches published version in Physical
Review Letters | Phys. Rev. Lett. 109, 041801 (2012) | 10.1103/PhysRevLett.109.041801 | Nikhef-2012-006 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have recently seen new upper bounds for $B^0_s\to \mu^+\mu^-$, a key decay
to search for physics beyond the Standard Model. Furthermore a non-vanishing
decay width difference $\Delta\Gamma_s$ of the $B_s$ system has been measured.
We show that $\Delta\Gamma_s$ affects the extraction of the $B^0_s\to
\mu^+\mu^-$ branching ratio and the resulting constraints on the New Physics
parameter space, and give formulae for including this effect. Moreover, we
point out that $\Delta\Gamma_s$ provides a new observable, the effective
$B^0_s\to \mu^+\mu^-$ lifetime $\tau_{\mu^+\mu^-}$, which offers a
theoretically clean probe for New Physics searches that is complementary to the
branching ratio. Should the $B^0_s\to \mu^+\mu^-$ branching ratio agree with
the Standard Model, the measurement of $\tau_{\mu^+\mu^-}$, which appears
feasible at upgrades of the LHC experiments, may still reveal large New Physics
effects.
| [
{
"created": "Sun, 8 Apr 2012 15:16:31 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2012 16:27:00 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Jun 2012 12:40:04 GMT",
"version": "v3"
},
{
"created": "Fri, 27 Jul 2012 09:10:30 GMT",
"version": "v4"
}
] | 2012-07-30 | [
[
"De Bruyn",
"Kristof",
""
],
[
"Fleischer",
"Robert",
""
],
[
"Knegjens",
"Robert",
""
],
[
"Koppenburg",
"Patrick",
""
],
[
"Merk",
"Marcel",
""
],
[
"Pellegrino",
"Antonio",
""
],
[
"Tuning",
"Niels",
""
... | We have recently seen new upper bounds for $B^0_s\to \mu^+\mu^-$, a key decay to search for physics beyond the Standard Model. Furthermore a non-vanishing decay width difference $\Delta\Gamma_s$ of the $B_s$ system has been measured. We show that $\Delta\Gamma_s$ affects the extraction of the $B^0_s\to \mu^+\mu^-$ branching ratio and the resulting constraints on the New Physics parameter space, and give formulae for including this effect. Moreover, we point out that $\Delta\Gamma_s$ provides a new observable, the effective $B^0_s\to \mu^+\mu^-$ lifetime $\tau_{\mu^+\mu^-}$, which offers a theoretically clean probe for New Physics searches that is complementary to the branching ratio. Should the $B^0_s\to \mu^+\mu^-$ branching ratio agree with the Standard Model, the measurement of $\tau_{\mu^+\mu^-}$, which appears feasible at upgrades of the LHC experiments, may still reveal large New Physics effects. |
1507.03222 | Xing-Gang Wu | Dai-Min Zeng, Sheng-Quan Wang, Xing-Gang Wu and Jian-Ming Shen | The Higgs-Boson Decay $H\to gg$ to Order $\alpha_s^5$ under the
mMOM-Scheme | 9 pages, 3 figures. Revised version to be published in J.Phys.G | J. Phys. G: Nucl. Part. Phys. 43 (2016) 075001 | 10.1088/0954-3899/43/7/075001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decay width of the Higgs-boson $H\to gg$ up to order
$\alpha_s^5$ under the minimal momentum space subtraction scheme (mMOM-scheme).
To improve the accuracy of perturbative QCD prediction, we adopt the principle
of maximum conformality (PMC) to set its renormalization scales. A detailed
comparison of the total decay width and the separate decay widths at each
perturbative order before and after the PMC scale setting is presented. The PMC
adopts the renormalization group equation to fix the optimal scales of the
process. After the PMC scale setting, the scale-dependence for both the total
and the separate decay widths are greatly suppressed, and the convergence of
perturbative QCD series is improved. By taking the Higgs mass $M_H=125.09\pm
0.21\pm 0.11$ GeV, as recently given by the ATLAS and CMS collaborations, we
predict $\Gamma(H\to gg)|_{\rm mMOM, PMC} = 339.1\pm 1.7^{+4.0}_{-2.4}$ keV,
where the first error is for Higgs mass and the second error is the residual
scale dependence by varying the initial scale $\mu_r\in[M_H/2,4M_H]$.
| [
{
"created": "Sun, 12 Jul 2015 12:11:28 GMT",
"version": "v1"
},
{
"created": "Mon, 23 May 2016 01:35:30 GMT",
"version": "v2"
}
] | 2016-05-24 | [
[
"Zeng",
"Dai-Min",
""
],
[
"Wang",
"Sheng-Quan",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Shen",
"Jian-Ming",
""
]
] | We study the decay width of the Higgs-boson $H\to gg$ up to order $\alpha_s^5$ under the minimal momentum space subtraction scheme (mMOM-scheme). To improve the accuracy of perturbative QCD prediction, we adopt the principle of maximum conformality (PMC) to set its renormalization scales. A detailed comparison of the total decay width and the separate decay widths at each perturbative order before and after the PMC scale setting is presented. The PMC adopts the renormalization group equation to fix the optimal scales of the process. After the PMC scale setting, the scale-dependence for both the total and the separate decay widths are greatly suppressed, and the convergence of perturbative QCD series is improved. By taking the Higgs mass $M_H=125.09\pm 0.21\pm 0.11$ GeV, as recently given by the ATLAS and CMS collaborations, we predict $\Gamma(H\to gg)|_{\rm mMOM, PMC} = 339.1\pm 1.7^{+4.0}_{-2.4}$ keV, where the first error is for Higgs mass and the second error is the residual scale dependence by varying the initial scale $\mu_r\in[M_H/2,4M_H]$. |
1801.03598 | Yin Huang | Yin Huang, Cheng-jian Xiao, Qi Fang L\"u, Rong Wang, Jun He, Lisheng
Geng | Strong and radiative decays of D\Xi molecular state and newly observed
$\Omega_c$ states | 7pages,6 figures | Phys. Rev. D 97, 094013 (2018) | 10.1103/PhysRevD.97.094013 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study strong and radiative decays of S-wave D\Xi molecular
state, which is related to the \Omega^*_c states newly observed at LHCb. The
coupling between the D\Xi molecular state and its constituents D and \Xi is
calculated by using the compositeness condition. With the obtained coupling,
the partial decay widths of the D\Xi molecular state into the \Xi_c^{+}K^{-},
\Xi^{'+}_cK^{-} and \Omega^{*}_c(2695)\gamma final states through hadronic loop
are calculated with the help of the effective Lagrangians. By comparison with
the LHCb observation, the current results of total decay width support the
\Omega^{*}_c(3119) or \Omega^{*}_c(3050) as D\Xi molecule while the the decay
width of the \Omega^{*}_c(3000), \Omega^{*}_c(3066) and \Omega^{*}_c(3090) can
not be well reproduced in the molecular state picture. The partial decay widths
are also presented and helpful to further understand the internal structures of
\Omega^{*}_c(3119) and \Omega^{*}_c(3050).
| [
{
"created": "Thu, 11 Jan 2018 00:38:30 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Apr 2018 06:02:08 GMT",
"version": "v2"
}
] | 2018-05-23 | [
[
"Huang",
"Yin",
""
],
[
"Xiao",
"Cheng-jian",
""
],
[
"Lü",
"Qi Fang",
""
],
[
"Wang",
"Rong",
""
],
[
"He",
"Jun",
""
],
[
"Geng",
"Lisheng",
""
]
] | In this work, we study strong and radiative decays of S-wave D\Xi molecular state, which is related to the \Omega^*_c states newly observed at LHCb. The coupling between the D\Xi molecular state and its constituents D and \Xi is calculated by using the compositeness condition. With the obtained coupling, the partial decay widths of the D\Xi molecular state into the \Xi_c^{+}K^{-}, \Xi^{'+}_cK^{-} and \Omega^{*}_c(2695)\gamma final states through hadronic loop are calculated with the help of the effective Lagrangians. By comparison with the LHCb observation, the current results of total decay width support the \Omega^{*}_c(3119) or \Omega^{*}_c(3050) as D\Xi molecule while the the decay width of the \Omega^{*}_c(3000), \Omega^{*}_c(3066) and \Omega^{*}_c(3090) can not be well reproduced in the molecular state picture. The partial decay widths are also presented and helpful to further understand the internal structures of \Omega^{*}_c(3119) and \Omega^{*}_c(3050). |
2407.11653 | Tengyu Ai | Tengyu Ai, Yuxuan He, Jia Liu, Xiaolin Ma and Xiao-Ping Wang | Particle Conversions Beyond the WKB Approximation and Solar-Induced
Gravitational Waves from Dark Photon Dark Matter | 28 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the conversion of kinetic mixing dark photon dark matter into
gravitational waves within the magnetic field of the Sun. Our study reveals
that the WKB approximation is invalid in this scenario. We derive an analytic
solution for the conversion probability with unitary evolution feature. This
solution aligns in form with previous studies on photon-gravitational wave
conversion. Interestingly, it is applicable in situations where the WKB
approximation fails. We extend the unitary evolution solution to other
conversion processes, such as axion-photon and dark photon-photon conversions.
When the WKB approximation conditions are met, this solution reduces to the WKB
result. We compute the characteristic strain of gravitational waves resulting
from dark photon conversion in the solar magnetic field, spanning frequencies
from $10^{-5}$ Hz to $10^3$ Hz. Our findings indicate that the characteristic
strain derived from the unitary evolution solution differs significantly from
that of the WKB solution. The resulting strain signal is far below the
sensitivity of current gravitational wave interferometers. Nevertheless, we
have proposed an exotic gravitational wave source, especially at high
frequencies, from the dark photon dark matter local conversion inside the Sun.
| [
{
"created": "Tue, 16 Jul 2024 12:19:15 GMT",
"version": "v1"
}
] | 2024-07-17 | [
[
"Ai",
"Tengyu",
""
],
[
"He",
"Yuxuan",
""
],
[
"Liu",
"Jia",
""
],
[
"Ma",
"Xiaolin",
""
],
[
"Wang",
"Xiao-Ping",
""
]
] | We investigate the conversion of kinetic mixing dark photon dark matter into gravitational waves within the magnetic field of the Sun. Our study reveals that the WKB approximation is invalid in this scenario. We derive an analytic solution for the conversion probability with unitary evolution feature. This solution aligns in form with previous studies on photon-gravitational wave conversion. Interestingly, it is applicable in situations where the WKB approximation fails. We extend the unitary evolution solution to other conversion processes, such as axion-photon and dark photon-photon conversions. When the WKB approximation conditions are met, this solution reduces to the WKB result. We compute the characteristic strain of gravitational waves resulting from dark photon conversion in the solar magnetic field, spanning frequencies from $10^{-5}$ Hz to $10^3$ Hz. Our findings indicate that the characteristic strain derived from the unitary evolution solution differs significantly from that of the WKB solution. The resulting strain signal is far below the sensitivity of current gravitational wave interferometers. Nevertheless, we have proposed an exotic gravitational wave source, especially at high frequencies, from the dark photon dark matter local conversion inside the Sun. |
2303.12485 | Wen-Jing Xing | Wen-Jing Xing, Shanshan Cao and Guang-You Qin | Flavor hierarchy of parton energy loss in quark-gluon plasma from a
Bayesian analysis | 7 pages, 5 figures | Phys.Lett.B 850 (2024) 138523 | 10.1016/j.physletb.2024.138523 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quenching of light and heavy flavor hadrons in relativistic heavy-ion
collisions probes the color and flavor dependences of parton energy loss
through a color-deconfined quark-gluon plasma (QGP), and thus reveals the
properties of QCD matter at extremely high density and temperature. By
combining a next-to-leading order perturbative QCD calculation of parton
production, a general ansatz of parton energy loss functions and parton
fragmentation functions, we calculate the nuclear modification of various
hadron species -- charged hadrons, $D$ mesons and $B$-decayed $J/\psi$ -- over
a wide transverse momentum regime. Comparing our calculations to the
experimental data using the Bayesian statistical analysis, we perform a first
simultaneous extraction of the energy loss functions of gluons ($g$), light
quarks ($q$), charm quarks ($c$) and bottom quarks ($b$) inside the QGP. We
find that the average parton energy loss at high energies follows the expected
hierarchy of $\langle \Delta E_g \rangle > \langle \Delta E_q \rangle \sim
\langle \Delta E_c \rangle > \langle \Delta E_b \rangle$, while the parton
energy loss distribution can further test the QCD calculations of parton
interaction with the dense nuclear matter. We also find that the reduction of
experimental uncertainties can significantly improve the precision of the
extracted parton energy loss functions inside the QGP.
| [
{
"created": "Wed, 22 Mar 2023 11:52:45 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Apr 2024 02:42:11 GMT",
"version": "v2"
}
] | 2024-04-22 | [
[
"Xing",
"Wen-Jing",
""
],
[
"Cao",
"Shanshan",
""
],
[
"Qin",
"Guang-You",
""
]
] | The quenching of light and heavy flavor hadrons in relativistic heavy-ion collisions probes the color and flavor dependences of parton energy loss through a color-deconfined quark-gluon plasma (QGP), and thus reveals the properties of QCD matter at extremely high density and temperature. By combining a next-to-leading order perturbative QCD calculation of parton production, a general ansatz of parton energy loss functions and parton fragmentation functions, we calculate the nuclear modification of various hadron species -- charged hadrons, $D$ mesons and $B$-decayed $J/\psi$ -- over a wide transverse momentum regime. Comparing our calculations to the experimental data using the Bayesian statistical analysis, we perform a first simultaneous extraction of the energy loss functions of gluons ($g$), light quarks ($q$), charm quarks ($c$) and bottom quarks ($b$) inside the QGP. We find that the average parton energy loss at high energies follows the expected hierarchy of $\langle \Delta E_g \rangle > \langle \Delta E_q \rangle \sim \langle \Delta E_c \rangle > \langle \Delta E_b \rangle$, while the parton energy loss distribution can further test the QCD calculations of parton interaction with the dense nuclear matter. We also find that the reduction of experimental uncertainties can significantly improve the precision of the extracted parton energy loss functions inside the QGP. |
1912.09110 | Matthias Heller | Matthias Heller, Andreas von Manteuffel, Robert M. Schabinger, Hubert
Spiesberger | Mixed QCD-EW two-loop corrections to Drell-Yan production | 9 pages, 1 figure, talk given at RADCOR19 | null | null | MSUHEP-19-028, MITP/19-089 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Drell-Yan production of charged lepton pairs is one of the key processes
measured at hadron colliders. The QCD corrections to the cross section are
known to order $\alpha_s^2$ and electroweak corrections are known to order
$\alpha$. The next important step for a better theoretical understanding is the
complete calculation of the mixed QCD-EW corrections of order $\alpha_s\alpha$.
In my talk, I report on the first complete calculation of the virtual two-loop
corrections of order $\alpha\alpha_s$ to the lepton-pair production cross
section. The calculation is carried out analytically using tensor reduction,
integration-by-parts relations and the method of differential equations. We
validate a previous calculation of the subset of mixed QCD-QED corrections and
show how the jet and soft functions of that reference can be used to subtract
the infrared divergences of the complete mixed QCD-electroweak virtual
corrections.
| [
{
"created": "Thu, 19 Dec 2019 10:35:35 GMT",
"version": "v1"
}
] | 2019-12-20 | [
[
"Heller",
"Matthias",
""
],
[
"von Manteuffel",
"Andreas",
""
],
[
"Schabinger",
"Robert M.",
""
],
[
"Spiesberger",
"Hubert",
""
]
] | The Drell-Yan production of charged lepton pairs is one of the key processes measured at hadron colliders. The QCD corrections to the cross section are known to order $\alpha_s^2$ and electroweak corrections are known to order $\alpha$. The next important step for a better theoretical understanding is the complete calculation of the mixed QCD-EW corrections of order $\alpha_s\alpha$. In my talk, I report on the first complete calculation of the virtual two-loop corrections of order $\alpha\alpha_s$ to the lepton-pair production cross section. The calculation is carried out analytically using tensor reduction, integration-by-parts relations and the method of differential equations. We validate a previous calculation of the subset of mixed QCD-QED corrections and show how the jet and soft functions of that reference can be used to subtract the infrared divergences of the complete mixed QCD-electroweak virtual corrections. |
hep-ph/9611231 | Jeonghyeon Song | N. Fornengo, C. Giunti, C.W. Kim and J. Song (The Johns Hopkins
University, USA, and INFN, Sezione di Torino, Italy) | Gravitational Effects on the Neutrino Oscillation | 15 pages, RevTex, No figures. Minor modifications and some typos
corrected | Phys.Rev.D56:1895-1902,1997 | 10.1103/PhysRevD.56.1895 | JHU-TIPAC 96026, DFTT 72/96 | hep-ph gr-qc | null | The propagation of neutrinos in a gravitational field is studied. A method of
calculating a covariant quantum-mechanical phase in a curved space-time is
presented. The result is used to calculate gravitational effects on the
neutrino oscillation in the presence of a gravitational field. We restrict our
discussion to the case of the Schwartzschild metric. Specifically, the cases of
the radial propagation and the non-radial propagation are considered. A
possible application to gravitational lensing of neutrinos is also suggested.
| [
{
"created": "Tue, 5 Nov 1996 03:39:51 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Nov 1996 23:36:47 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Fornengo",
"N.",
"",
"The Johns Hopkins\n University, USA, and INFN, Sezione di Torino, Italy"
],
[
"Giunti",
"C.",
"",
"The Johns Hopkins\n University, USA, and INFN, Sezione di Torino, Italy"
],
[
"Kim",
"C. W.",
"",
"The Johns Hopkins\n University, US... | The propagation of neutrinos in a gravitational field is studied. A method of calculating a covariant quantum-mechanical phase in a curved space-time is presented. The result is used to calculate gravitational effects on the neutrino oscillation in the presence of a gravitational field. We restrict our discussion to the case of the Schwartzschild metric. Specifically, the cases of the radial propagation and the non-radial propagation are considered. A possible application to gravitational lensing of neutrinos is also suggested. |
hep-ph/9704377 | U. Meissner | Ulf-G. Mei{\ss}ner, G. M\"uller and S. Steininger | Virtual photons in SU(2) chiral perturbation theory and electromagnetic
corrections to $\pi\pi$ scattering | 13 pp, LaTeX file, 2 figures (uses epsf), two entries in table 1
changed due to change of basis, one footnote added, refs updated, accepted
for publication in Phys. Lett. B | Phys.Lett. B406 (1997) 154-160; Erratum-ibid. B407 (1997) 454 | 10.1016/S0370-2693(97)00666-7 | KFA-IKP(TH)-1997-06 and TK 97 07 | hep-ph nucl-th | null | We construct the generating functional of two flavor chiral perturbation
theory including the effects of virtual photons in the one loop approximation.
As an application, we calculate the electromagnetic corrections to the elastic
$\pi\pi$ scattering amplitude, in particular to its S--wave threshold
parameters. Numerical estimates are given for the reaction $\pi^0 \pi^0 \to
\pi^0 \pi^0$. These electromagnetic effects are found to be smaller than the
hadronic two-loop corrections for the scattering length $a_0$. The effective
range $b_0$ increases by 36% due to the unitary cusp.
| [
{
"created": "Tue, 22 Apr 1997 15:13:37 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 1997 07:18:21 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Jul 1997 13:54:28 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Meißner",
"Ulf-G.",
""
],
[
"Müller",
"G.",
""
],
[
"Steininger",
"S.",
""
]
] | We construct the generating functional of two flavor chiral perturbation theory including the effects of virtual photons in the one loop approximation. As an application, we calculate the electromagnetic corrections to the elastic $\pi\pi$ scattering amplitude, in particular to its S--wave threshold parameters. Numerical estimates are given for the reaction $\pi^0 \pi^0 \to \pi^0 \pi^0$. These electromagnetic effects are found to be smaller than the hadronic two-loop corrections for the scattering length $a_0$. The effective range $b_0$ increases by 36% due to the unitary cusp. |
1509.07848 | Nikolaos Kidonakis | Nikolaos Kidonakis | High-order threshold corrections for top-pair and single-top production | 7 pages, 5 figures; presented at DPF2015, Ann Arbor, Michigan, August
4-8, 2015 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present results for high-order corrections from threshold resummation to
cross sections and differential distributions in top-antitop pair production
and in single-top production. I show aN$^3$LO results for the total $t{\bar t}$
cross section as well as for the top-quark transverse momentum ($p_T$) and
rapidity distributions, and the top-quark forward-backward asymmetry in $t{\bar
t}$ production. I compare with the most recent Tevatron and LHC data, including
at 13 TeV. I also present aNNLO results for cross sections and $p_T$
distributions in $t$-channel, $s$-channel, and $tW$-channel single-top
production.
| [
{
"created": "Fri, 25 Sep 2015 19:29:27 GMT",
"version": "v1"
}
] | 2015-09-28 | [
[
"Kidonakis",
"Nikolaos",
""
]
] | I present results for high-order corrections from threshold resummation to cross sections and differential distributions in top-antitop pair production and in single-top production. I show aN$^3$LO results for the total $t{\bar t}$ cross section as well as for the top-quark transverse momentum ($p_T$) and rapidity distributions, and the top-quark forward-backward asymmetry in $t{\bar t}$ production. I compare with the most recent Tevatron and LHC data, including at 13 TeV. I also present aNNLO results for cross sections and $p_T$ distributions in $t$-channel, $s$-channel, and $tW$-channel single-top production. |
1906.03145 | Volodymyr Vovchenko | Volodymyr Vovchenko, Benjamin D\"onigus, Horst Stoecker | Canonical statistical model analysis of p-p, p-Pb, and Pb-Pb collisions
at the LHC | 14 pages, 7 figures. To be published in Physical Review C, source
code and figure data at https://github.com/vlvovch/CSM | Phys. Rev. C 100, 054906 (2019) | 10.1103/PhysRevC.100.054906 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The system-size dependence of hadrochemistry at vanishing baryon density is
considered within the canonical statistical model (CSM) with local exact
conservation of three conserved charges, allowing for a possibility of
strangeness undersaturation, i.e. $\gamma_S \leq 1$. Exact baryon number
conservation is found to be even more important than that of strangeness in the
canonical suppression picture at the LHC, in contrast to intermediate and low
collision energies. The model is applied to p-p, p-Pb, and Pb-Pb data of the
ALICE collaboration. A chemical equilibrium CSM with a fixed $T_{\rm ch} = 155$
MeV describes the trends seen in most yield ratios. However, this vanilla
version of CSM predicts an enhancement of the $\phi/\pi$ ratio at smaller
multiplicities, in stark contrast to the suppression seen in the data. The data
are described with a 15% relative accuracy level whence a multiplicity
dependence of both the temperature and the strangeness saturation parameter
$\gamma_S \leq 1$ is accepted. Both the canonical suppression and the
strangeness undersaturation effects are small at $d N_{\rm ch} / d\eta \gtrsim
100$, but they do improve substantially the description of hadron yields in p-p
collisions, in particular the $\Omega$ yields. A possibility to constrain the
rapidity correlation volume using net-proton fluctuation measurements is
pointed out.
| [
{
"created": "Fri, 7 Jun 2019 15:03:06 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2019 10:22:11 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Nov 2019 17:10:29 GMT",
"version": "v3"
}
] | 2019-11-27 | [
[
"Vovchenko",
"Volodymyr",
""
],
[
"Dönigus",
"Benjamin",
""
],
[
"Stoecker",
"Horst",
""
]
] | The system-size dependence of hadrochemistry at vanishing baryon density is considered within the canonical statistical model (CSM) with local exact conservation of three conserved charges, allowing for a possibility of strangeness undersaturation, i.e. $\gamma_S \leq 1$. Exact baryon number conservation is found to be even more important than that of strangeness in the canonical suppression picture at the LHC, in contrast to intermediate and low collision energies. The model is applied to p-p, p-Pb, and Pb-Pb data of the ALICE collaboration. A chemical equilibrium CSM with a fixed $T_{\rm ch} = 155$ MeV describes the trends seen in most yield ratios. However, this vanilla version of CSM predicts an enhancement of the $\phi/\pi$ ratio at smaller multiplicities, in stark contrast to the suppression seen in the data. The data are described with a 15% relative accuracy level whence a multiplicity dependence of both the temperature and the strangeness saturation parameter $\gamma_S \leq 1$ is accepted. Both the canonical suppression and the strangeness undersaturation effects are small at $d N_{\rm ch} / d\eta \gtrsim 100$, but they do improve substantially the description of hadron yields in p-p collisions, in particular the $\Omega$ yields. A possibility to constrain the rapidity correlation volume using net-proton fluctuation measurements is pointed out. |
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