id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0412400 | Martin Beneke | M. Beneke (Aachen), Th. Feldmann (Siegen) and D. Seidel (Aachen) | Exclusive radiative and electroweak b->d and b->s penguin decays at NLO | 29 pages, LaTeX | Eur.Phys.J.C41:173-188,2005 | 10.1140/epjc/s2005-02181-5 | PITHA 04/19 | hep-ph hep-ex | null | We provide Standard Model expectations for the rare radiative decays B->K^*
gamma, B->rho gamma and B-> omega gamma, and the electroweak penguin decays
B->K^* l^+ l^- and B->rho l^+ l^- at the next-to-leading order (NLO), extending
our previous results to b->d transitions. We consider branching fractions,
isospin asymmetries and direct CP asymmetries. For the electroweak penguin
decays, the lepton-invariant mass spectrum and forward-backward asymmetry is
also included. Radiative and electroweak penguin transitions in b->d are mainly
interesting in the search for new flavour-changing neutral current
interactions, but in addition the B->rho gamma decays provide constraints on
the CKM parameters (\bar\rho,\bar\eta). The potential impact of these
constraints is discussed.
| [
{
"created": "Tue, 28 Dec 2004 13:57:15 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Beneke",
"M.",
"",
"Aachen"
],
[
"Feldmann",
"Th.",
"",
"Siegen"
],
[
"Seidel",
"D.",
"",
"Aachen"
]
] | We provide Standard Model expectations for the rare radiative decays B->K^* gamma, B->rho gamma and B-> omega gamma, and the electroweak penguin decays B->K^* l^+ l^- and B->rho l^+ l^- at the next-to-leading order (NLO), extending our previous results to b->d transitions. We consider branching fractions, isospin asymmetries and direct CP asymmetries. For the electroweak penguin decays, the lepton-invariant mass spectrum and forward-backward asymmetry is also included. Radiative and electroweak penguin transitions in b->d are mainly interesting in the search for new flavour-changing neutral current interactions, but in addition the B->rho gamma decays provide constraints on the CKM parameters (\bar\rho,\bar\eta). The potential impact of these constraints is discussed. |
hep-ph/9307319 | null | P.E. Haagensen | On The Exact Implementation Of Gauss' Law In Yang-Mills Theory | 4 pages, TeX, UB-ECM-PF 93/16 | null | null | null | hep-ph | null | It is possible to find different sets of local coordinates in the field space
of Yang-Mills theories which implement Gauss' law manifestly for physical
states. The singular points of the transformations to these gauge-invariant
coordinates induce energy barriers in the Hamiltonian much like angular
momentum in quantum mechanics, and these formulations suggest a vacuum state
functional qualitatively different from the perturbative one. Lecture given at
the XIII Particles and Nuclei International Conference, Perugia, Italy, June 28
- July 2, 1993.
| [
{
"created": "Thu, 22 Jul 1993 14:38:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Haagensen",
"P. E.",
""
]
] | It is possible to find different sets of local coordinates in the field space of Yang-Mills theories which implement Gauss' law manifestly for physical states. The singular points of the transformations to these gauge-invariant coordinates induce energy barriers in the Hamiltonian much like angular momentum in quantum mechanics, and these formulations suggest a vacuum state functional qualitatively different from the perturbative one. Lecture given at the XIII Particles and Nuclei International Conference, Perugia, Italy, June 28 - July 2, 1993. |
hep-ph/0504098 | Mohamad Ali Gomshi Nobary | M.A. Gomshi Nobary and B. Javadi | Direct Fragmentation of Quarkonia Including Fermi Motion Using
Light-cone Wave Function | 7 pages 5 figures Appeared in EPJC; Fig 1 and Appendix revised | Eur.Phys.J.C42:37-42,2005; Eur.Phys.J.C51:501-501,2007 | 10.1140/epjc/s2005-02266-1 10.1140/epjc/s10052-006-0198-y | Razi-hep 117 | hep-ph | null | We investigate the effect of Fermi motion on the direct fragmentation of the
$J/\psi$ and $\Upsilon$ states employing a light-cone wave function. Consistent
with such a wave function we set up the kinematics of a heavy quark fragmenting
into a quarkonia such that the Fermi motion of the constituents split into
longitudinal as well as transverse direction and thus calculate the
fragmentation functions for these states. In the framework of our
investigation, we estimate that the fragmentation probabilities of $J/\psi$ and
$\Upsilon$ may increase at least up to 14 percent when including this degree of
freedom.
| [
{
"created": "Wed, 13 Apr 2005 13:31:05 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jan 2006 10:44:11 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jun 2006 15:24:39 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Nobary",
"M. A. Gomshi",
""
],
[
"Javadi",
"B.",
""
]
] | We investigate the effect of Fermi motion on the direct fragmentation of the $J/\psi$ and $\Upsilon$ states employing a light-cone wave function. Consistent with such a wave function we set up the kinematics of a heavy quark fragmenting into a quarkonia such that the Fermi motion of the constituents split into longitudinal as well as transverse direction and thus calculate the fragmentation functions for these states. In the framework of our investigation, we estimate that the fragmentation probabilities of $J/\psi$ and $\Upsilon$ may increase at least up to 14 percent when including this degree of freedom. |
1703.07364 | Farinaldo Queiroz | Giorgio Arcadi, Ma\'ira Dutra, Pradipta Ghosh, Manfred Lindner, Yann
Mambrini, Mathias Pierre, Stefano Profumo, Farinaldo S. Queiroz | The Waning of the WIMP? A Review of Models, Searches, and Constraints | 101 pages, 20 figures | null | 10.1140/epjc/s10052-018-5662-y | null | hep-ph astro-ph.HE hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Weakly Interacting Massive Particles (WIMPs) are among the best-motivated
dark matter candidates. In light of no conclusive detection signal yet despite
an extensive search program that combines, often in a complementary way,
direct, indirect, and collider probes, we find it timely to give a broad
overview of the WIMP paradigm. In particular, we review here the theoretical
foundations of the WIMP paradigm, discuss status and prospects of various
detection strategies, and explore future experimental challenges and
opportunities.
| [
{
"created": "Tue, 21 Mar 2017 18:00:12 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Arcadi",
"Giorgio",
""
],
[
"Dutra",
"Maíra",
""
],
[
"Ghosh",
"Pradipta",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Mambrini",
"Yann",
""
],
[
"Pierre",
"Mathias",
""
],
[
"Profumo",
"Stefano",
""
],
[
... | Weakly Interacting Massive Particles (WIMPs) are among the best-motivated dark matter candidates. In light of no conclusive detection signal yet despite an extensive search program that combines, often in a complementary way, direct, indirect, and collider probes, we find it timely to give a broad overview of the WIMP paradigm. In particular, we review here the theoretical foundations of the WIMP paradigm, discuss status and prospects of various detection strategies, and explore future experimental challenges and opportunities. |
1409.1687 | Sebastian Pa{\ss}ehr | Wolfgang Hollik and Sebastian Pa{\ss}ehr | Higgs boson masses and mixings in the complex MSSM with two-loop
top-Yukawa-coupling corrections | 45 pages, 9 figures | null | 10.1007/JHEP10(2014)171 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results for the leading two-loop corrections of
$\mathcal{O}{\left(\alpha_t^2\right)}$ from the Yukawa sector to the
Higgs-boson mass spectrum of the MSSM with complex parameters are presented,
with details of the analytical calculation performed in the
Feynman-diagrammatic approach using a mixed
$\left.\text{on-shell}\middle/\,\overline{\text{DR}}\right.$ scheme that can be
directly matched onto the higher-order terms in the code ${\tt FeynHiggs}$.
Numerical results are shown for the masses and mixing effects in the neutral
Higgs-boson sector and their variation with the phases of the complex
parameters. Furthermore, the analytical expressions of the two-loop
self-energies and the required renormalization constants are recorded. The new
results can consistently be implemented in ${\tt FeynHiggs}$.
| [
{
"created": "Fri, 5 Sep 2014 08:31:35 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Nov 2014 16:52:58 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Hollik",
"Wolfgang",
""
],
[
"Paßehr",
"Sebastian",
""
]
] | Results for the leading two-loop corrections of $\mathcal{O}{\left(\alpha_t^2\right)}$ from the Yukawa sector to the Higgs-boson mass spectrum of the MSSM with complex parameters are presented, with details of the analytical calculation performed in the Feynman-diagrammatic approach using a mixed $\left.\text{on-shell}\middle/\,\overline{\text{DR}}\right.$ scheme that can be directly matched onto the higher-order terms in the code ${\tt FeynHiggs}$. Numerical results are shown for the masses and mixing effects in the neutral Higgs-boson sector and their variation with the phases of the complex parameters. Furthermore, the analytical expressions of the two-loop self-energies and the required renormalization constants are recorded. The new results can consistently be implemented in ${\tt FeynHiggs}$. |
1106.2890 | Shao-Ming Wang | Yan Han, Wang Shao-Ming, Ma Wen-Gan, Zhang Ren-You, and Guo Lei | QCD NLO predictions to $W$-pair production in association with a massive
(anti)bottom-jet at the LHC | Published version in PRD | Phys.Rev.D84:014009,2011 | 10.1103/PhysRevD.84.014009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $W$-pair production in association with a massive (anti)bottom jet is not
only an important background to a number of interesting processes, such as the
single top production associated with a W boson, but also a potential
background to new physics searches. We present the calculations of the total
and differential cross sections for the $W^+W^-+ b(\bar{b})$ jet productions at
the LHC up to the QCD next-to-leading order (NLO). Our results by adopting the
QCD NLO contribution collection scheme-I show that the K factors can be 1.66
and 1.21 with the inclusive and exclusive two-jet event selection schemes
respectively, when we set $m_H=120 GeV$, $\mu=m_W+m_b/2$ and take the
constraints of $p_{T,b(\bar{b})}>25 GeV$, $|y_{b(\bar{b})}|<2.5$ for
$b(\bar{b})$ jet. We find that the stabilization of the theoretical prediction
for the integrated cross section for the $pp \to W^+W^-b(\bar b)+X$ up to the
QCD NLO requires a veto on a second isolated hard jet and the inclusion of the
QCD NLO contribution from the $W^+W^-b\bar{b}(bb, \bar{b}\bar{b})$ production
with the final two $b(\bar{b})$ quarks being merged as one jet.
| [
{
"created": "Wed, 15 Jun 2011 06:48:46 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jul 2011 03:21:23 GMT",
"version": "v2"
}
] | 2011-08-19 | [
[
"Han",
"Yan",
""
],
[
"Shao-Ming",
"Wang",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Lei",
"Guo",
""
]
] | The $W$-pair production in association with a massive (anti)bottom jet is not only an important background to a number of interesting processes, such as the single top production associated with a W boson, but also a potential background to new physics searches. We present the calculations of the total and differential cross sections for the $W^+W^-+ b(\bar{b})$ jet productions at the LHC up to the QCD next-to-leading order (NLO). Our results by adopting the QCD NLO contribution collection scheme-I show that the K factors can be 1.66 and 1.21 with the inclusive and exclusive two-jet event selection schemes respectively, when we set $m_H=120 GeV$, $\mu=m_W+m_b/2$ and take the constraints of $p_{T,b(\bar{b})}>25 GeV$, $|y_{b(\bar{b})}|<2.5$ for $b(\bar{b})$ jet. We find that the stabilization of the theoretical prediction for the integrated cross section for the $pp \to W^+W^-b(\bar b)+X$ up to the QCD NLO requires a veto on a second isolated hard jet and the inclusion of the QCD NLO contribution from the $W^+W^-b\bar{b}(bb, \bar{b}\bar{b})$ production with the final two $b(\bar{b})$ quarks being merged as one jet. |
hep-ph/9401254 | Andrea Vicere' | G. Cella, G. Curci, G. Ricciardi, A. Vicere' | The b -> s gamma decay revisited | 11 pages RevTeX + 2 EPSF figures, report IFUP-TH 2/94, HUTP-93/A038.
PostScript file or hardcopy available from the authors upon request | Phys.Lett. B325 (1994) 227-234 | 10.1016/0370-2693(94)90096-5 | null | hep-ph | null | In this work we compute the leading logarithmic corrections to the b -> s
gamma decay in a dimensional scheme which does not require any definition of
the gamma5 matrix. The scheme does not exhibit unconsistencies and it is
therefore a viable alternative to the t'Hooft Veltman scheme, particularly in
view of the next-to-leading computation. We confirm the recent results of
Ciuchini et al.
| [
{
"created": "Fri, 14 Jan 1994 12:28:16 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Cella",
"G.",
""
],
[
"Curci",
"G.",
""
],
[
"Ricciardi",
"G.",
""
],
[
"Vicere'",
"A.",
""
]
] | In this work we compute the leading logarithmic corrections to the b -> s gamma decay in a dimensional scheme which does not require any definition of the gamma5 matrix. The scheme does not exhibit unconsistencies and it is therefore a viable alternative to the t'Hooft Veltman scheme, particularly in view of the next-to-leading computation. We confirm the recent results of Ciuchini et al. |
hep-ph/9410308 | null | Andrei L. Kataev | Radiative QCD Corrections: A Personal Outlook | Invited Summary Talk at the Symposium on "Radiative Corrections:
Status and Outlook", Galtinburg,Tennessee, USA, 27 June- 1 July 1994;
preprint CERN-TH.7465/94; 27 pages, 8 figures not included in the text; the
copy with figures can be recieved from the author by the additional
request;additional correction of Eq. (12) is made | null | null | null | hep-ph | null | We describe several problems related to the studies of the effects of
radiative QCD corrections in the phenomenological and theoretical
considerations thus summarizing the work of the QCD part of the Symposium on
"Radiative Corrections: Status and Outlook".
| [
{
"created": "Tue, 18 Oct 1994 12:50:06 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 1994 20:09:44 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Oct 1994 13:04:36 GMT",
"version": "v3"
}
] | 2009-09-25 | [
[
"Kataev",
"Andrei L.",
""
]
] | We describe several problems related to the studies of the effects of radiative QCD corrections in the phenomenological and theoretical considerations thus summarizing the work of the QCD part of the Symposium on "Radiative Corrections: Status and Outlook". |
1811.07635 | Evgenij Martynov | Evgenij Martynov, Basarab Nicolescu | Odderon: models vs experimental data - a short review of recent papers | 4 pages, 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The surprising low TOTEM datum $\rho_{pp}$ = 0.09$\pm$0.01 at 13 TeV
\cite{TOTEM-1} generated an important flux of papers, which can be classified
in three categories: 1) papers which claim that this result is the first
experimental discovery of the Odderon, namely in its maximal form; 2) papers
which tried, without success, to find alternative explanations of this result;
3) papers which contest the discovery of the Maximal Odderon.
In the present short note we discuss two recent papers belonging to the third
category.
| [
{
"created": "Mon, 19 Nov 2018 12:01:47 GMT",
"version": "v1"
}
] | 2018-11-20 | [
[
"Martynov",
"Evgenij",
""
],
[
"Nicolescu",
"Basarab",
""
]
] | The surprising low TOTEM datum $\rho_{pp}$ = 0.09$\pm$0.01 at 13 TeV \cite{TOTEM-1} generated an important flux of papers, which can be classified in three categories: 1) papers which claim that this result is the first experimental discovery of the Odderon, namely in its maximal form; 2) papers which tried, without success, to find alternative explanations of this result; 3) papers which contest the discovery of the Maximal Odderon. In the present short note we discuss two recent papers belonging to the third category. |
hep-ph/9807247 | Levai Peter | Miklos Gyulassy (Columbia Univ.) and Peter Levai (Columbia Univ. and
KFKI RMKI) | Jet Quenching and Cronin Enhancement in A+A at s^1/2=20 vs 200 AGeV | 10 pages, Latex and 3 EPS figures are included, submitted to Phys.
Lett. B | Phys.Lett.B442:1-6,1998 | 10.1016/S0370-2693(98)01258-1 | null | hep-ph | null | The sensitivity of semi-hard (p_\perp < 10 GeV) hadron production to parton
energy loss in high energy nuclear collisions is studied via the HIJING1.35
model. We test the model on recent WA98 data on 160 AGeV Pb+Pb -> pi^0 up to 4
GeV/c and while these data are reproduced, the results depends sensitively on
the model of the Cronin effect. At (RHIC) collider energies (s^1/2 > 200 AGeV),
on the other hand, semi-hard hadron production becomes insensitive to the above
model and is thus expected to be a cleaner probe of jet quenching signature
associated with non-Abelian radiative energy loss.
| [
{
"created": "Fri, 3 Jul 1998 22:10:03 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Gyulassy",
"Miklos",
"",
"Columbia Univ."
],
[
"Levai",
"Peter",
"",
"Columbia Univ. and\n KFKI RMKI"
]
] | The sensitivity of semi-hard (p_\perp < 10 GeV) hadron production to parton energy loss in high energy nuclear collisions is studied via the HIJING1.35 model. We test the model on recent WA98 data on 160 AGeV Pb+Pb -> pi^0 up to 4 GeV/c and while these data are reproduced, the results depends sensitively on the model of the Cronin effect. At (RHIC) collider energies (s^1/2 > 200 AGeV), on the other hand, semi-hard hadron production becomes insensitive to the above model and is thus expected to be a cleaner probe of jet quenching signature associated with non-Abelian radiative energy loss. |
1305.5307 | Ken-iti Izawa | Takumi Imai and K.-I. Izawa | Minimal Fine Tuning in Supersymmetric Higgs Inflation | 9 pages, 3 tables | null | 10.1093/ptep/ptu054 | YITP-13-37 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate characteristic features of realistic parameter choice for
primordial inflation with supersymmetric Higgs inflaton as an example of
particle physics inflation model. We discuss constraints from observational
results and analyze the degree of fine tuning needed to induce slow-roll
inflation for wide range of soft supersymmetry breaking scale. The observed
amplitude of density fluctuations implies that the minimal fine tuning for the
combined electroweak scale and inflaton flatness predicts the spectral index of
0.950--0.965, which includes the central value from observational data.
| [
{
"created": "Thu, 23 May 2013 03:35:51 GMT",
"version": "v1"
}
] | 2016-06-21 | [
[
"Imai",
"Takumi",
""
],
[
"Izawa",
"K. -I.",
""
]
] | We investigate characteristic features of realistic parameter choice for primordial inflation with supersymmetric Higgs inflaton as an example of particle physics inflation model. We discuss constraints from observational results and analyze the degree of fine tuning needed to induce slow-roll inflation for wide range of soft supersymmetry breaking scale. The observed amplitude of density fluctuations implies that the minimal fine tuning for the combined electroweak scale and inflaton flatness predicts the spectral index of 0.950--0.965, which includes the central value from observational data. |
hep-ph/0106293 | Fabio Maltoni | F. Maltoni, K. Paul, T. Stelzer, S. Willenbrock | Associated production of Higgs and single top at hadron colliders | 22 pages, 13 figures | Phys.Rev. D64 (2001) 094023 | 10.1103/PhysRevD.64.094023 | null | hep-ph | null | We study the production of the Higgs boson in association with a single top
quark at hadron colliders. The cross sections for the three production
processes (t-channel, s-channel, and W-associated) at both the Tevatron and the
LHC are presented. We investigate the possibility of detecting a signal for the
largest of these processes, the t-channel process at the LHC, via the Higgs
decay into b b-bar. The QCD backgrounds are large and difficult to curb,
hindering the extraction of the signal. Extensions of our analysis to the
production of supersymmetric Higgs bosons are also addressed. The cross section
is enhanced for large values of tangent beta, increasing the prospects for
extracting a signal.
| [
{
"created": "Wed, 27 Jun 2001 19:08:56 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Maltoni",
"F.",
""
],
[
"Paul",
"K.",
""
],
[
"Stelzer",
"T.",
""
],
[
"Willenbrock",
"S.",
""
]
] | We study the production of the Higgs boson in association with a single top quark at hadron colliders. The cross sections for the three production processes (t-channel, s-channel, and W-associated) at both the Tevatron and the LHC are presented. We investigate the possibility of detecting a signal for the largest of these processes, the t-channel process at the LHC, via the Higgs decay into b b-bar. The QCD backgrounds are large and difficult to curb, hindering the extraction of the signal. Extensions of our analysis to the production of supersymmetric Higgs bosons are also addressed. The cross section is enhanced for large values of tangent beta, increasing the prospects for extracting a signal. |
hep-ph/0701257 | Jorge Casalderrey-Solana | Jorge Casalderrey-Solana | Mach Cones in Quark Gluon Plasma | 8 pages, 3 figures, Invited plenary talk given at the 19th
International Conference on Ultrarelativistic Nucleus-Nucleus Collisions:
Quark Matter 2006 (QM 2006), Shanghai, China, 14-20 Nov 2006 | J.Phys.G34:S345-352,2007 | 10.1088/0954-3899/34/8/S21 | null | hep-ph | null | The experimental azimuthal dihadron distributions at RHIC show a double peak
structure in the away side ($\Delta \phi = \pi \pm 1.2$ rad.) for intermediate
$p_t$ particles. A variety of models have appeared trying to describe this
modification. We will review most of them, with special emphasis in the Conical
Flow scenario in which the observed shape is a consequence of the emission of
sound by a supersonic high momentum particle propagating in the Quark Gluon
Plasma.
| [
{
"created": "Tue, 30 Jan 2007 20:06:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Casalderrey-Solana",
"Jorge",
""
]
] | The experimental azimuthal dihadron distributions at RHIC show a double peak structure in the away side ($\Delta \phi = \pi \pm 1.2$ rad.) for intermediate $p_t$ particles. A variety of models have appeared trying to describe this modification. We will review most of them, with special emphasis in the Conical Flow scenario in which the observed shape is a consequence of the emission of sound by a supersonic high momentum particle propagating in the Quark Gluon Plasma. |
2101.07270 | Melissa van Beekveld | Melissa van Beekveld, Eric Laenen, Jort Sinninghe Damst\'e, Leonardo
Vernazza | Next-to-leading power threshold corrections for finite order and
resummed colour-singlet cross sections | Code available at github.com/melli1992/resummation | null | 10.1007/JHEP05(2021)114 | Nikhef/2021-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study next-to-leading-power (NLP) threshold corrections in colour-singlet
production processes, with particular emphasis on Drell-Yan (DY) and
single-Higgs production. We assess the quality of the partonic and hadronic
threshold expansions for each process up to NNLO. We determine numerically the
NLP leading-logarithmic (LL) resummed contribution in addition to the
leading-power next-to-next-to-leading logarithmic (LP NNLL) resummed DY and
Higgs cross sections, matched to NNLO. We find that the inclusion of NLP
logarithms is numerically more relevant than increasing the precision to
N$^3$LL at LP for these processes. We also perform an analytical and numerical
comparison of LP NNLL + NLP LL resummation in soft-collinear effective theory
and direct QCD, where we achieve excellent analytical and numerical agreement
once the NLP LL terms are included in both formalisms. Our results underline
the phenomenological importance of understanding the NLP structure of QCD cross
sections.
| [
{
"created": "Mon, 18 Jan 2021 19:00:01 GMT",
"version": "v1"
}
] | 2021-06-02 | [
[
"van Beekveld",
"Melissa",
""
],
[
"Laenen",
"Eric",
""
],
[
"Damsté",
"Jort Sinninghe",
""
],
[
"Vernazza",
"Leonardo",
""
]
] | We study next-to-leading-power (NLP) threshold corrections in colour-singlet production processes, with particular emphasis on Drell-Yan (DY) and single-Higgs production. We assess the quality of the partonic and hadronic threshold expansions for each process up to NNLO. We determine numerically the NLP leading-logarithmic (LL) resummed contribution in addition to the leading-power next-to-next-to-leading logarithmic (LP NNLL) resummed DY and Higgs cross sections, matched to NNLO. We find that the inclusion of NLP logarithms is numerically more relevant than increasing the precision to N$^3$LL at LP for these processes. We also perform an analytical and numerical comparison of LP NNLL + NLP LL resummation in soft-collinear effective theory and direct QCD, where we achieve excellent analytical and numerical agreement once the NLP LL terms are included in both formalisms. Our results underline the phenomenological importance of understanding the NLP structure of QCD cross sections. |
1310.6016 | Sophie Renner Ms | B. C. Allanach and S. A. Renner | Large Hadron Collider constraints on a light baryon number violating
sbottom coupling to a top and a light quark | 9 pages, 9 figures. v2 has minor corrections, in part due to extra
diagrams at order alpha_s^2 lamba''^2 | null | 10.1140/epjc/s10052-013-2707-0 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a model of R-parity violating (RPV) supersymmetry in which the
right-handed sbottom is the lightest supersymmetric particle, and a baryon
number violating coupling involving a top is the only non-negligible RPV
coupling. This model evades proton decay and flavour constraints. We consider
in turn each of the couplings lambda"_{313} and lambda"_{323} as the only
non-negligible RPV coupling, and we recast two recent Large Hadron Collider
(LHC) measurements and searches (CMS top transverse momentum p_T(t) spectrum
and ATLAS multiple jet resonance search) in the form of constraints on the
mass-coupling parameter planes. We delineate a large region in the parameter
space of the mass of the sbottom (m_{b_R}) and the lambda"_{313} coupling that
is ruled out by the measurements, as well as a smaller region in the parameter
space of m_{b_R} and lambda"_{323}. A certain region of the
m_{b_R}-lambda"_{313} parameter space was previously found to successfully
explain the anomalously large ttbar forward backward asymmetry measured by
Tevatron experiments. The entire region is excluded at the 95% CL by CMS
measurements of the top p_T spectrum. We also present p_T(ttbar) distributions
of the forward-backward asymmetry for this model.
| [
{
"created": "Tue, 22 Oct 2013 19:24:46 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Dec 2013 18:52:12 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Allanach",
"B. C.",
""
],
[
"Renner",
"S. A.",
""
]
] | We investigate a model of R-parity violating (RPV) supersymmetry in which the right-handed sbottom is the lightest supersymmetric particle, and a baryon number violating coupling involving a top is the only non-negligible RPV coupling. This model evades proton decay and flavour constraints. We consider in turn each of the couplings lambda"_{313} and lambda"_{323} as the only non-negligible RPV coupling, and we recast two recent Large Hadron Collider (LHC) measurements and searches (CMS top transverse momentum p_T(t) spectrum and ATLAS multiple jet resonance search) in the form of constraints on the mass-coupling parameter planes. We delineate a large region in the parameter space of the mass of the sbottom (m_{b_R}) and the lambda"_{313} coupling that is ruled out by the measurements, as well as a smaller region in the parameter space of m_{b_R} and lambda"_{323}. A certain region of the m_{b_R}-lambda"_{313} parameter space was previously found to successfully explain the anomalously large ttbar forward backward asymmetry measured by Tevatron experiments. The entire region is excluded at the 95% CL by CMS measurements of the top p_T spectrum. We also present p_T(ttbar) distributions of the forward-backward asymmetry for this model. |
1808.05623 | Olcyr Sumensari | Olcyr Sumensari | Theory overview of semileptonic $B$ decays | To be published in the proceedings of The International Conference on
B-Physics at Frontier Machines - BEAUTY2018, La Biodola, Elba Island, Italy,
6-11 May, 2018 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review the recent theoretical progress on the study of tree-level
semileptonic $b\to c$ decays. After briefly reviewing the latest developments
on the exclusive determinations of $|V_{cb}|$, I discuss the hints on lepton
flavor universality violation in $B\to D^{(\ast)}\ell \bar{\nu}$ decays.
Particular emphasis is given to the implications of these anomalies and to the
possibilities to experimentally test the proposed New Physics explanations.
| [
{
"created": "Thu, 16 Aug 2018 18:00:03 GMT",
"version": "v1"
}
] | 2018-08-20 | [
[
"Sumensari",
"Olcyr",
""
]
] | I review the recent theoretical progress on the study of tree-level semileptonic $b\to c$ decays. After briefly reviewing the latest developments on the exclusive determinations of $|V_{cb}|$, I discuss the hints on lepton flavor universality violation in $B\to D^{(\ast)}\ell \bar{\nu}$ decays. Particular emphasis is given to the implications of these anomalies and to the possibilities to experimentally test the proposed New Physics explanations. |
1409.7257 | M.G.A. Buffing | M. G. A. Buffing, A. Mukherjee and P. J. Mulders | Universality of TMD correlators | 6 pages, presented by the first author at the 4th International
Workshop on Transverse Polarization Phenomena in Hard Processes (Transversity
2014), June 9-13, 2014, Chia, Italy. To appear in EPJ Web of Conferences | null | 10.1051/epjconf/20158502001 | NIKHEF 2014-037 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a high-energy scattering process with hadrons in the initial state, color
is involved. Transverse momentum dependent distribution functions (TMDs)
describe the quark and gluon distributions in these hadrons in momentum space
with the inclusion of transverse directions. Apart from the (anti)-quarks and
gluons that are involved in the hard scattering process, additional gluon
emissions by the hadrons have to be taken into account as well, giving rise to
Wilson lines or gauge links. The TMDs involved are sensitive to the process
under consideration and hence potentially nonuniversal due to these Wilson line
interactions with the hard process; different hard processes give rise to
different Wilson line structures. We will show that in practice only a finite
number of universal TMDs have to be considered, which come in different linear
combinations depending on the hard process under consideration, ensuring a
generalized universality. For quarks this gives rise to three Pretzelocity
functions, whereas for gluons a richer structure of functions arises.
| [
{
"created": "Thu, 25 Sep 2014 13:53:50 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Buffing",
"M. G. A.",
""
],
[
"Mukherjee",
"A.",
""
],
[
"Mulders",
"P. J.",
""
]
] | In a high-energy scattering process with hadrons in the initial state, color is involved. Transverse momentum dependent distribution functions (TMDs) describe the quark and gluon distributions in these hadrons in momentum space with the inclusion of transverse directions. Apart from the (anti)-quarks and gluons that are involved in the hard scattering process, additional gluon emissions by the hadrons have to be taken into account as well, giving rise to Wilson lines or gauge links. The TMDs involved are sensitive to the process under consideration and hence potentially nonuniversal due to these Wilson line interactions with the hard process; different hard processes give rise to different Wilson line structures. We will show that in practice only a finite number of universal TMDs have to be considered, which come in different linear combinations depending on the hard process under consideration, ensuring a generalized universality. For quarks this gives rise to three Pretzelocity functions, whereas for gluons a richer structure of functions arises. |
2306.07726 | Giovanni Pelliccioli | Michele Grossi, Massimiliano Incudini, Mathieu Pellen, Giovanni
Pelliccioli | Amplitude-assisted tagging of longitudinally polarised bosons using wide
neural networks | 30 pages, 10 figures, 4 tables. Matches version published in EPJC | Eur. Phys. J. C 83, 759 (2023) | 10.1140/epjc/s10052-023-11931-y | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extracting longitudinal modes of weak bosons in LHC processes is essential to
understand the electroweak-symmetry-breaking mechanism. To that end, we propose
a general method, based on wide neural networks, to properly model
longitudinal-boson signals and hence enable the event-by-event tagging of
longitudinal bosons. It combines experimentally accessible kinematic
information and genuine theoretical inputs provided by amplitudes in
perturbation theory. As an application we consider the production of a Z boson
in association with a jet at the LHC, both at leading order and in the presence
of parton-shower effects. The devised neural networks are able to extract
reliably the longitudinal contribution to the unpolarised process. The proposed
method is very general and can be systematically extended to other processes
and problems.
| [
{
"created": "Tue, 13 Jun 2023 12:29:27 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2023 11:53:45 GMT",
"version": "v2"
}
] | 2024-01-24 | [
[
"Grossi",
"Michele",
""
],
[
"Incudini",
"Massimiliano",
""
],
[
"Pellen",
"Mathieu",
""
],
[
"Pelliccioli",
"Giovanni",
""
]
] | Extracting longitudinal modes of weak bosons in LHC processes is essential to understand the electroweak-symmetry-breaking mechanism. To that end, we propose a general method, based on wide neural networks, to properly model longitudinal-boson signals and hence enable the event-by-event tagging of longitudinal bosons. It combines experimentally accessible kinematic information and genuine theoretical inputs provided by amplitudes in perturbation theory. As an application we consider the production of a Z boson in association with a jet at the LHC, both at leading order and in the presence of parton-shower effects. The devised neural networks are able to extract reliably the longitudinal contribution to the unpolarised process. The proposed method is very general and can be systematically extended to other processes and problems. |
hep-ph/0507261 | Peter Kroll | P. Kroll | Deeply virtual vector meson electroproduction at small Bjorken-x | 4 pages, 4 figures, contribution to DIS05, Madison, USA | null | 10.1063/1.2122073 | null | hep-ph | null | It is reported on an analysis of vector meson electroproduction at small
Bjorken-x within the handbag approach. Using a model for the generalized parton
distribution and calculating the partonic subprocess, electroproduction off
gluons, within the modified perturbative approach, cross sections and spin
density matrix elements are evaluated. The numerical results agree fairly well
with recent HERA data.
| [
{
"created": "Fri, 22 Jul 2005 12:20:04 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kroll",
"P.",
""
]
] | It is reported on an analysis of vector meson electroproduction at small Bjorken-x within the handbag approach. Using a model for the generalized parton distribution and calculating the partonic subprocess, electroproduction off gluons, within the modified perturbative approach, cross sections and spin density matrix elements are evaluated. The numerical results agree fairly well with recent HERA data. |
hep-ph/0511029 | Vladimir Galkin | D. Ebert, R. N. Faustov, V. O. Galkin | Masses and electroweak properties of light mesons in the relativistic
quark model | 19 pages, 7 figures, version to be published in Eur.Phys.J.C | Eur.Phys.J.C47:745-755,2006 | 10.1140/epjc/s2006-02601-0 | HU-EP-05/73 | hep-ph | null | The masses, pseudoscalar and vector weak decay constants and electromagnetic
form factors of light S-wave mesons are studied in the framework of the
relativistic quark model based on the quasipotential approach. We use the same
model assumptions and parameters as in our previous investigations of heavy
meson and baryon properties. The masses and wave functions of the ground state
and radially excited pi, rho, K, K* and phi mesons, obtained by solving
numerically the relativistic Schroedinger-like equation with the complete
relativistic q bar q potential including both spin-independent and
spin-dependent terms, are presented. Novel relativistic expressions for the
weak decay constants of the pseudoscalar and vector mesons are derived. It is
shown that the intermediate negative-energy quark states give significant
contributions which essentially decrease the decay constants bringing them in
agreement with experimental data. The electromagnetic form factors of the pion,
charged and neutral kaon are calculated in a broad range of the space-like
momentum transfer. The corresponding charge radii are determined. All results
agree well with available experimental data.
| [
{
"created": "Thu, 3 Nov 2005 16:15:28 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2006 09:56:45 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] | The masses, pseudoscalar and vector weak decay constants and electromagnetic form factors of light S-wave mesons are studied in the framework of the relativistic quark model based on the quasipotential approach. We use the same model assumptions and parameters as in our previous investigations of heavy meson and baryon properties. The masses and wave functions of the ground state and radially excited pi, rho, K, K* and phi mesons, obtained by solving numerically the relativistic Schroedinger-like equation with the complete relativistic q bar q potential including both spin-independent and spin-dependent terms, are presented. Novel relativistic expressions for the weak decay constants of the pseudoscalar and vector mesons are derived. It is shown that the intermediate negative-energy quark states give significant contributions which essentially decrease the decay constants bringing them in agreement with experimental data. The electromagnetic form factors of the pion, charged and neutral kaon are calculated in a broad range of the space-like momentum transfer. The corresponding charge radii are determined. All results agree well with available experimental data. |
hep-ph/9505354 | Frank Krueger | M. Gremm, F. Kr\"uger and L. M. Sehgal | Angular Distribution and Polarization of Photons in the Inclusive Decay
$\Lambda_b\to X_s\,\gamma$ | 10 pages, LaTeX, uses epsf, 2 figures appended as uuencoded,
compressed eps tar-files | Phys.Lett. B355 (1995) 579-583 | 10.1016/0370-2693(95)00722-W | PITHA 95/12 | hep-ph | null | We study the angular distribution of photons produced in the inclusive decay
of a polarized $\Lambda_b$, $\Lambda_b\to X_s\,\gamma$, using the technique of
Heavy Quark Effective Theory. Finite non-perturbative corrections are obtained
relative to the free quark decay $b\to s\gamma$. These corrections affect
significantly the intensity and polarization of photons emitted at small angles
relative to the $\Lambda_b$ spin direction.
| [
{
"created": "Mon, 22 May 1995 10:42:24 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Gremm",
"M.",
""
],
[
"Krüger",
"F.",
""
],
[
"Sehgal",
"L. M.",
""
]
] | We study the angular distribution of photons produced in the inclusive decay of a polarized $\Lambda_b$, $\Lambda_b\to X_s\,\gamma$, using the technique of Heavy Quark Effective Theory. Finite non-perturbative corrections are obtained relative to the free quark decay $b\to s\gamma$. These corrections affect significantly the intensity and polarization of photons emitted at small angles relative to the $\Lambda_b$ spin direction. |
hep-ph/0105324 | Matthias Burkardt | Matthias Burkardt (New Mexico State University) | Generalized Parton Distributions and Distribution of Partons in the
Transverse Plane | invited talk at `Workshop on Lepton Scattering, Hadrons and QCD',
Adelaide, March 26 - April 6, 2001, 8 pages, sprocl.sty | null | 10.1142/9789812799708_0006 | null | hep-ph | null | I discuss the physical interpretation of GPDs in the limit $\xi=0$, where the
$t$ dependence contains information about the distribution of partons in the
transverse plane. GPDs thus allow a simultaneous determination of the
longitudinal momentum and transverse position of partons in the infinite
momentum frame, which also provides a physical interpretation for Ji's angular
momentum sum rule.
| [
{
"created": "Wed, 30 May 2001 16:57:51 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Burkardt",
"Matthias",
"",
"New Mexico State University"
]
] | I discuss the physical interpretation of GPDs in the limit $\xi=0$, where the $t$ dependence contains information about the distribution of partons in the transverse plane. GPDs thus allow a simultaneous determination of the longitudinal momentum and transverse position of partons in the infinite momentum frame, which also provides a physical interpretation for Ji's angular momentum sum rule. |
hep-ph/0305279 | Joan Sola | Ilya L. Shapiro, Joan Sola | Cosmological constant, renormalization group and Planck scale physics | LaTeX, 6 pages, no figures. Talk presented at IRGA 2003:
Renormalization Group and Anomalies in Gravitation and Cosmology, Ouro Preto,
Brazil, 16-23 March, 2003 | null | 10.1016/S0920-5632(03)02402-2 | null | hep-ph astro-ph gr-qc hep-th | null | Starting from generic quantum effects at the Planck scale M_P, we find that
the renormalization group running of the cosmological constant (CC) at low
energies is possible if there is a smooth decoupling of all massive particles
from M_P to the mass of the lightest neutrino. We discuss the theoretical
implications of this running for the ``old'' and ``new'' cosmological constant
problems. Interestingly enough, the CC running implies a strong relationship
between quantum field theory and cosmology, which should be observable in the
near future in experiments such as SNAP through the measurement of a cubic
redshift dependence of the CC.
| [
{
"created": "Sun, 25 May 2003 09:33:14 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Shapiro",
"Ilya L.",
""
],
[
"Sola",
"Joan",
""
]
] | Starting from generic quantum effects at the Planck scale M_P, we find that the renormalization group running of the cosmological constant (CC) at low energies is possible if there is a smooth decoupling of all massive particles from M_P to the mass of the lightest neutrino. We discuss the theoretical implications of this running for the ``old'' and ``new'' cosmological constant problems. Interestingly enough, the CC running implies a strong relationship between quantum field theory and cosmology, which should be observable in the near future in experiments such as SNAP through the measurement of a cubic redshift dependence of the CC. |
1709.09989 | Bhavesh Chauhan | Bhavesh Chauhan, Bharti Kindra | Invoking Chiral Vector Leptoquark to explain LFU violation in B Decays | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LHCb has recently reported more than $2\sigma$ deviation from the Standard
Model prediction in the observable $R_{J/\psi}$. We study this anomaly in the
framework of a vector leptoquark along with other lepton flavor universality
violating measurements which include $R_{K^{(*)}}$, and $R_{D^{(*)}}$. We show
that a chiral vector leptoquark can explain all the aforementioned anomalies
consistently while also respecting other experimental constraints.
| [
{
"created": "Wed, 27 Sep 2017 17:35:23 GMT",
"version": "v1"
}
] | 2017-09-29 | [
[
"Chauhan",
"Bhavesh",
""
],
[
"Kindra",
"Bharti",
""
]
] | LHCb has recently reported more than $2\sigma$ deviation from the Standard Model prediction in the observable $R_{J/\psi}$. We study this anomaly in the framework of a vector leptoquark along with other lepton flavor universality violating measurements which include $R_{K^{(*)}}$, and $R_{D^{(*)}}$. We show that a chiral vector leptoquark can explain all the aforementioned anomalies consistently while also respecting other experimental constraints. |
hep-ph/0107096 | F. Arleo | F. Arleo | Quarkonium hadron interaction in QCD | 4 pages, 2 figures. Talk given at XXXVIth Rencontres de Moriond: QCD
and High Energy Hadronic Interactions, Les Arcs, France, 17-24 March 2001 | null | null | null | hep-ph | null | The analytic continuation of the operator product expansion of the scattering
amplitude allows to compute the heavy-quarkonium hadron total cross section.
The energy dependence of the Upsilon and Upsilon' cross sections with a proton
is discussed.
| [
{
"created": "Mon, 9 Jul 2001 17:40:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arleo",
"F.",
""
]
] | The analytic continuation of the operator product expansion of the scattering amplitude allows to compute the heavy-quarkonium hadron total cross section. The energy dependence of the Upsilon and Upsilon' cross sections with a proton is discussed. |
hep-ph/0501024 | Lianyi He | Lianyi He and Pengfei Zhuang | Phase Structure of Nambu-Jona-Lasinio Model at Finite Isospin Density | 8 pages, submitted to Phys.Lett.B | Phys.Lett.B615:93-101,2005 | 10.1016/j.physletb.2005.03.066 | null | hep-ph nucl-th | null | In the frame of flavor SU(2) Nambu--Jona-Lasinio model with $U_A(1)$ breaking
term we found that, the structure of two chiral phase transition lines does not
exist at low isospin density in real world, and the critical isospin chemical
potential for pion superfluidity is exactly the pion mass in the vacuum.
| [
{
"created": "Wed, 5 Jan 2005 07:55:58 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jan 2005 08:41:22 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"He",
"Lianyi",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | In the frame of flavor SU(2) Nambu--Jona-Lasinio model with $U_A(1)$ breaking term we found that, the structure of two chiral phase transition lines does not exist at low isospin density in real world, and the critical isospin chemical potential for pion superfluidity is exactly the pion mass in the vacuum. |
hep-ph/9902388 | Amit Kundu | Amit Kundu, S. Mallik and D. Rai Chaudhuri | Calculation of density fluctuation in inflationary epoch | 12 pages, latex, 1 figure, axodraw | Phys.Rev. D61 (2000) 043508 | 10.1103/PhysRevD.61.043508 | SINP-TNP 99/3 | hep-ph | null | Starting from an initial state of thermal equilibrium, we derive an
expression for the quantum fluctuation in the energy density during the
inflationary epoch in terms of the mode functions for the inflaton field. The
effect of this particular initial state is not washed out in the final formula,
contrary to what is usually believed. Numerically, however, the effect is
completely negligible, validating the use of the two point function in the
vacuum state. We also point out the requirement of conventional quantum field
theory during inflation, that the quantum fluctuation in a wavelength must be
evaluated, at the latest, when the wavelength crosses the Hubble length, in
contrast to the usual practice in the literature.
| [
{
"created": "Thu, 18 Feb 1999 12:06:06 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 1999 12:04:16 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kundu",
"Amit",
""
],
[
"Mallik",
"S.",
""
],
[
"Chaudhuri",
"D. Rai",
""
]
] | Starting from an initial state of thermal equilibrium, we derive an expression for the quantum fluctuation in the energy density during the inflationary epoch in terms of the mode functions for the inflaton field. The effect of this particular initial state is not washed out in the final formula, contrary to what is usually believed. Numerically, however, the effect is completely negligible, validating the use of the two point function in the vacuum state. We also point out the requirement of conventional quantum field theory during inflation, that the quantum fluctuation in a wavelength must be evaluated, at the latest, when the wavelength crosses the Hubble length, in contrast to the usual practice in the literature. |
2408.04719 | Abhishek Mohapatra | Matthias Berwein, Nora Brambilla, Abhishek Mohapatra, and Antonio
Vairo | One Born$-$Oppenheimer Effective Theory to rule them all: hybrids,
tetraquarks, pentaquarks, doubly heavy baryons and quarkonium | 115 pages, 13 figures, 13 tables | null | null | TUM-EFT 185/23 | hep-ph hep-ex hep-lat | http://creativecommons.org/licenses/by/4.0/ | The discovery of XYZ exotic states in the hadronic sector with two heavy
quarks, represents a significant challenge in particle theory. Understanding
and predicting their nature remains an open problem. In this work, we
demonstrate how the Born$-$Oppenheimer (BO) effective field theory (BOEFT),
derived from Quantum Chromodynamics (QCD) on the basis of scale separation and
symmetries, can address XYZ exotics of any composition. We derive the
Schr\"odinger coupled equations that describe hybrids, tetraquarks,
pentaquarks, doubly heavy baryons, and quarkonia at leading order,
incorporating nonadiabatic terms, and present the predicted multiples. We
define the static potentials in terms of the QCD static energies for all
relevant cases. We provide the precise form of the nonperturbative low-energy
gauge-invariant correlators required for the BOEFT: static energies,
generalized Wilson loops, gluelumps, and adjoint mesons. These are to be
calculated on the lattice and we calculate here their short-distance behavior.
Furthermore, we outline how spin-dependent corrections and mixing terms can be
incorporated using matching computations. Lastly, we discuss how static
energies with the same BO quantum numbers mix at large distances leading to the
phenomenon of avoided level crossing. This effect is crucial to understand the
emergence of exotics with molecular characteristics, such as the
$\chi_{c1}(3872)$. With BOEFT both the tetraquark and the molecular picture
appear as part of the same description.
| [
{
"created": "Thu, 8 Aug 2024 18:36:37 GMT",
"version": "v1"
}
] | 2024-08-12 | [
[
"Berwein",
"Matthias",
""
],
[
"Brambilla",
"Nora",
""
],
[
"Mohapatra",
"Abhishek",
""
],
[
"Vairo",
"Antonio",
""
]
] | The discovery of XYZ exotic states in the hadronic sector with two heavy quarks, represents a significant challenge in particle theory. Understanding and predicting their nature remains an open problem. In this work, we demonstrate how the Born$-$Oppenheimer (BO) effective field theory (BOEFT), derived from Quantum Chromodynamics (QCD) on the basis of scale separation and symmetries, can address XYZ exotics of any composition. We derive the Schr\"odinger coupled equations that describe hybrids, tetraquarks, pentaquarks, doubly heavy baryons, and quarkonia at leading order, incorporating nonadiabatic terms, and present the predicted multiples. We define the static potentials in terms of the QCD static energies for all relevant cases. We provide the precise form of the nonperturbative low-energy gauge-invariant correlators required for the BOEFT: static energies, generalized Wilson loops, gluelumps, and adjoint mesons. These are to be calculated on the lattice and we calculate here their short-distance behavior. Furthermore, we outline how spin-dependent corrections and mixing terms can be incorporated using matching computations. Lastly, we discuss how static energies with the same BO quantum numbers mix at large distances leading to the phenomenon of avoided level crossing. This effect is crucial to understand the emergence of exotics with molecular characteristics, such as the $\chi_{c1}(3872)$. With BOEFT both the tetraquark and the molecular picture appear as part of the same description. |
2306.12797 | Krzysztof A. Meissner | Krzysztof A. Meissner and Hermann Nicolai | Searching for supermassive charged gravitinos in underground experiments | null | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine possible experimental signatures that may be exploited to search
for stable supermassive particles with electric charges of $O(1)$ in future
underground experiments, and the upcoming JUNO experiment in particular. The
telltale signal providing a unique signature of such particles, would be a
correlated sequence of three or more nuclear recoils along a straight line,
corresponding to the motion of a non-relativistic ($\beta \lesssim 10^{-2}$)
particle that could enter the detector from any direction. We provide some
preliminary estimates for the expected event rates.
| [
{
"created": "Thu, 22 Jun 2023 10:59:18 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Nov 2023 16:09:10 GMT",
"version": "v2"
}
] | 2023-11-08 | [
[
"Meissner",
"Krzysztof A.",
""
],
[
"Nicolai",
"Hermann",
""
]
] | We examine possible experimental signatures that may be exploited to search for stable supermassive particles with electric charges of $O(1)$ in future underground experiments, and the upcoming JUNO experiment in particular. The telltale signal providing a unique signature of such particles, would be a correlated sequence of three or more nuclear recoils along a straight line, corresponding to the motion of a non-relativistic ($\beta \lesssim 10^{-2}$) particle that could enter the detector from any direction. We provide some preliminary estimates for the expected event rates. |
hep-ph/9707241 | David Atwood | David Atwood | New Methods for Extracting the CKM Angle $\gamma$ using $B^\pm\to D^0
K^-$; $\bar D^0 K^-$ | 5 pages, 0 figures, Conference Proceedings | null | 10.1142/9789814503952_0039 | null | hep-ph | null | In this talk I will discuss the extraction of the CKM angle $\gamma$ at
B-factories through the interference of the subprocesses $B^-\to K^- D^0$ and
$B^- \to K^-\bar D^0$. This seemingly impossible interference may be
accomplished by allowing both $D^0$ and $\bar D^0$ to decay to a common final
state. If only CP eigenstate decay modes of the $D$ are considered, the
branching ratio for $B^- \to \bar D^0 K^-$ must be experimentally I describe
why this determination is likely to be experimentally impossible. On the other
hand, if more general $D$ decays are considered, the angle $\gamma$ may then be
determined. In fact, it is possible that a reasonable determination of $\gamma$
may be made with O(10^8) B's.
| [
{
"created": "Thu, 3 Jul 1997 20:33:49 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Atwood",
"David",
""
]
] | In this talk I will discuss the extraction of the CKM angle $\gamma$ at B-factories through the interference of the subprocesses $B^-\to K^- D^0$ and $B^- \to K^-\bar D^0$. This seemingly impossible interference may be accomplished by allowing both $D^0$ and $\bar D^0$ to decay to a common final state. If only CP eigenstate decay modes of the $D$ are considered, the branching ratio for $B^- \to \bar D^0 K^-$ must be experimentally I describe why this determination is likely to be experimentally impossible. On the other hand, if more general $D$ decays are considered, the angle $\gamma$ may then be determined. In fact, it is possible that a reasonable determination of $\gamma$ may be made with O(10^8) B's. |
1605.07624 | Peter Arnold | Peter Arnold, Han-Chih Chang and Shahin Iqbal | The LPM effect in sequential bremsstrahlung 2: factorization | 59 pages, 37 figures. Change from v2: a minor typo fixed in eq.
(E12c); nothing else affected | null | 10.1007/JHEP09(2016)078 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The splitting processes of bremsstrahlung and pair production in a medium are
coherent over large distances in the very high energy limit, which leads to a
suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. In this paper,
we continue analysis of the case when the coherence lengths of two consecutive
splitting processes overlap (which is important for understanding corrections
to standard treatments of the LPM effect in QCD), avoiding soft-gluon
approximations. In particular, this paper analyzes the subtle problem of how to
precisely separate overlapping double splitting (e.g.\ overlapping double
bremsstrahlung) from the case of consecutive, independent bremsstrahlung (which
is the case that would be implemented in a Monte Carlo simulation based solely
on single splitting rates). As an example of the method, we consider the rate
of real double gluon bremsstrahlung from an initial gluon with various
simplifying assumptions (thick media; $\hat q$ approximation; large $N_c$; and
neglect for the moment of processes involving 4-gluon vertices) and explicitly
compute the correction $\Delta\,d\Gamma/dx\,dy$ due to overlapping formation
times.
| [
{
"created": "Tue, 24 May 2016 20:00:06 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2016 22:03:37 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Mar 2023 16:24:57 GMT",
"version": "v3"
}
] | 2023-03-02 | [
[
"Arnold",
"Peter",
""
],
[
"Chang",
"Han-Chih",
""
],
[
"Iqbal",
"Shahin",
""
]
] | The splitting processes of bremsstrahlung and pair production in a medium are coherent over large distances in the very high energy limit, which leads to a suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. In this paper, we continue analysis of the case when the coherence lengths of two consecutive splitting processes overlap (which is important for understanding corrections to standard treatments of the LPM effect in QCD), avoiding soft-gluon approximations. In particular, this paper analyzes the subtle problem of how to precisely separate overlapping double splitting (e.g.\ overlapping double bremsstrahlung) from the case of consecutive, independent bremsstrahlung (which is the case that would be implemented in a Monte Carlo simulation based solely on single splitting rates). As an example of the method, we consider the rate of real double gluon bremsstrahlung from an initial gluon with various simplifying assumptions (thick media; $\hat q$ approximation; large $N_c$; and neglect for the moment of processes involving 4-gluon vertices) and explicitly compute the correction $\Delta\,d\Gamma/dx\,dy$ due to overlapping formation times. |
1110.1601 | Mohammad Moosavi Nejad | S. Mohammad Moosavi Nejad | B-mesons from top-quark decay in presence of the charged-Higgs boson in
the Zero-Mass Variable-Flavor-Number Scheme | 7 pages, 4 figures | Phys. Rev. D 85, 054010 (2012) | 10.1103/PhysRevD.85.054010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the energy spectrum of the inclusive bottom-flavored mesons in
top-quark decay into a charged-Higgs-boson and a massless bottom quark at
next-to-leading order (NLO) in the two-Higgs-doublet model. To extract the
result we work in the Zero-Mass Variable-Flavor-Number scheme(ZM-VFNs) using
realistic nonperturbative fragmentation functions obtained through a global fit
to $e^+e^-$ data from CERN LEP1 and SLAC SLC on the Z-boson resonance. We study
both the contribution of the bottom-quark fragmentation and the gluon
fragmentation to produce the bottom-flavored meson (B-Meson). We find that the
contribution of the gluon leads to an appreciable reduction in decay rate at
low values of the B-meson energy. It means the NLO corrections are significant.
| [
{
"created": "Fri, 7 Oct 2011 18:18:18 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Dec 2011 18:01:39 GMT",
"version": "v2"
}
] | 2012-05-12 | [
[
"Nejad",
"S. Mohammad Moosavi",
""
]
] | We study the energy spectrum of the inclusive bottom-flavored mesons in top-quark decay into a charged-Higgs-boson and a massless bottom quark at next-to-leading order (NLO) in the two-Higgs-doublet model. To extract the result we work in the Zero-Mass Variable-Flavor-Number scheme(ZM-VFNs) using realistic nonperturbative fragmentation functions obtained through a global fit to $e^+e^-$ data from CERN LEP1 and SLAC SLC on the Z-boson resonance. We study both the contribution of the bottom-quark fragmentation and the gluon fragmentation to produce the bottom-flavored meson (B-Meson). We find that the contribution of the gluon leads to an appreciable reduction in decay rate at low values of the B-meson energy. It means the NLO corrections are significant. |
hep-ph/0305211 | Jaime Besprosvany | J. Besprosvany | Standard-model coupling constants from compositeness | 12 pages, 17 references | Mod.Phys.Lett. A18 (2003) 1877-1885 | 10.1142/S0217732303011642 | null | hep-ph hep-th | null | A coupling-constant definition is given based on the compositeness property
of some particle states with respect to the elementary states of other
particles. It is applied in the context of the vector-spin-1/2-particle
interaction vertices of a field theory, and the standard model. The definition
reproduces Weinberg's angle in a grand-unified theory. One obtains coupling
values close to the experimental ones for appropriate configurations of the
standard-model vector particles, at the unification scale within grand-unified
models, and at the electroweak breaking scale.
| [
{
"created": "Mon, 19 May 2003 20:54:25 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Besprosvany",
"J.",
""
]
] | A coupling-constant definition is given based on the compositeness property of some particle states with respect to the elementary states of other particles. It is applied in the context of the vector-spin-1/2-particle interaction vertices of a field theory, and the standard model. The definition reproduces Weinberg's angle in a grand-unified theory. One obtains coupling values close to the experimental ones for appropriate configurations of the standard-model vector particles, at the unification scale within grand-unified models, and at the electroweak breaking scale. |
1507.00382 | Alexey Nefediev | C. Hanhart, Yu.S. Kalashnikova, P. Matuschek, R.V. Mizuk, A.V.
Nefediev, Q. Wang | A practical parametrization for line shapes of near-threshold states | LaTeX2e, 5 pages, 1 figure, typos corrected, version published in
Phys. Rev. Lett | Phys. Rev. Lett. 115, 202001 (2015) | 10.1103/PhysRevLett.115.202001 | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerous quarkonium(like) states lying near $S$-wave thresholds are observed
experimentally. We propose a self-consistent approach to these near-threshold
states compatible with unitarity and analyticity. The underlying
coupled-channel system includes a bare pole and an arbitrary number of elastic
and inelastic channels treated fully nonperturbatively. The resulting
analytical parametrization is ideally suited for a combined analysis of the
data available in various channels that is exemplified by an excellent overall
description of the data for the charged $Z_b(10610)$ and $Z_b(10650)$ states.
| [
{
"created": "Wed, 1 Jul 2015 22:01:16 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Oct 2015 15:54:43 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Nov 2015 12:31:49 GMT",
"version": "v3"
}
] | 2015-11-18 | [
[
"Hanhart",
"C.",
""
],
[
"Kalashnikova",
"Yu. S.",
""
],
[
"Matuschek",
"P.",
""
],
[
"Mizuk",
"R. V.",
""
],
[
"Nefediev",
"A. V.",
""
],
[
"Wang",
"Q.",
""
]
] | Numerous quarkonium(like) states lying near $S$-wave thresholds are observed experimentally. We propose a self-consistent approach to these near-threshold states compatible with unitarity and analyticity. The underlying coupled-channel system includes a bare pole and an arbitrary number of elastic and inelastic channels treated fully nonperturbatively. The resulting analytical parametrization is ideally suited for a combined analysis of the data available in various channels that is exemplified by an excellent overall description of the data for the charged $Z_b(10610)$ and $Z_b(10650)$ states. |
hep-ph/9905450 | George Lazarides | G. Lazarides (Aristotle University of Thessaloniki) | Degenerate or Hierarchical Neutrinos in Supersymmetric Inflation | 8 pages, 2 figures (included), uses JHEP.cls (included), talk given
at the Trieste Meeting of the TMR Network on Physics Beyond the Standard
Model, 24-27 February 1999, Trieste, Italy (to appear in the proceedings) | PoSTRIESTE99:008,1999 | null | UT-STPD-5/99 | hep-ph | null | Two moderate extensions of the minimal supersymmetric standard model are
considered. The first one includes a U(1)_{B-L} gauge group, while the second
is based on a left-right symmetric gauge group. In these models, hybrid
inflation is `naturally' realized and the mu problem is solved via a
Peccei-Quinn symmetry. Baryon number conservation is an automatic consequence
of a R-symmetry. The baryon asymmetry of the universe is generated through a
primordial leptogenesis. In the `B-L' case, neutrinos are assumed to acquire
degenerate masses equal to about 1.5 eV by coupling to SU(2)_L triplet
superfields, thereby providing the hot dark matter of the universe. In the
`left-right' model, light neutrinos acquire hierarchical masses by the seesaw
mechanism. They are taken from the small angle MSW resolution of the solar
neutrino puzzle and the SuperKamiokande data. Maximal nu_{mu}-nu_{tau} mixing,
implied by the same data, is easily accommodated. The gravitino and
baryogenesis constraints can be satisfied, in both models, with more or less
`natural' values of the relevant coupling constants.
| [
{
"created": "Sat, 22 May 1999 12:04:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lazarides",
"G.",
"",
"Aristotle University of Thessaloniki"
]
] | Two moderate extensions of the minimal supersymmetric standard model are considered. The first one includes a U(1)_{B-L} gauge group, while the second is based on a left-right symmetric gauge group. In these models, hybrid inflation is `naturally' realized and the mu problem is solved via a Peccei-Quinn symmetry. Baryon number conservation is an automatic consequence of a R-symmetry. The baryon asymmetry of the universe is generated through a primordial leptogenesis. In the `B-L' case, neutrinos are assumed to acquire degenerate masses equal to about 1.5 eV by coupling to SU(2)_L triplet superfields, thereby providing the hot dark matter of the universe. In the `left-right' model, light neutrinos acquire hierarchical masses by the seesaw mechanism. They are taken from the small angle MSW resolution of the solar neutrino puzzle and the SuperKamiokande data. Maximal nu_{mu}-nu_{tau} mixing, implied by the same data, is easily accommodated. The gravitino and baryogenesis constraints can be satisfied, in both models, with more or less `natural' values of the relevant coupling constants. |
1706.01816 | Junya Nakamura | Junya Nakamura | Polarisations of the $Z$ and $W$ bosons in the processes $pp \to ZH$ and
$pp \to W^{\pm}_{}H$ | 25 pages, 8 figures, 3 tables. v2; the errors in section 2.3 are
corrected | null | 10.1007/JHEP08(2017)008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $Z$ boson in the process $pp \to ZH$ and the $W^+_{}$ and $W^-_{}$ in the
process $pp \to W^{\pm}_{}H$ can be in polarised states. The polarisation
density matrix of the $Z$ ($W$) boson contains the complete information about a
state of polarisation of the $Z$ ($W$) boson, and $HZZ$, $HZ\gamma$ and $HWW$
interactions may be studied in detail from a careful analysis of these
matrices. In this paper, a systematic approach to analyse these polarisation
density matrices is presented. With the aim of making maximum use of the
polarisation information, all of the elements of the polarisation density
matrices are related with observables, which are measurable at the environment
of $pp$ collisions. Consequences of non-standard $HZZ$, $HZ\gamma$ and $HWW$
interactions for these observables are discussed.
| [
{
"created": "Tue, 6 Jun 2017 15:21:16 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Nov 2017 13:02:45 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Nakamura",
"Junya",
""
]
] | The $Z$ boson in the process $pp \to ZH$ and the $W^+_{}$ and $W^-_{}$ in the process $pp \to W^{\pm}_{}H$ can be in polarised states. The polarisation density matrix of the $Z$ ($W$) boson contains the complete information about a state of polarisation of the $Z$ ($W$) boson, and $HZZ$, $HZ\gamma$ and $HWW$ interactions may be studied in detail from a careful analysis of these matrices. In this paper, a systematic approach to analyse these polarisation density matrices is presented. With the aim of making maximum use of the polarisation information, all of the elements of the polarisation density matrices are related with observables, which are measurable at the environment of $pp$ collisions. Consequences of non-standard $HZZ$, $HZ\gamma$ and $HWW$ interactions for these observables are discussed. |
1503.07216 | Gil Paz | Gil Paz | An Introduction to NRQED | 10 pages | Mod. Phys. Lett. A, 30, 1550128 (2015) | 10.1142/S021773231550128X | WSU-HEP-1502 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a pedagogical introduction to NRQED (non-relativistic quantum
electrodynamics). NRQED is an effective field theory that describes the
interaction of non-relativistic, possibly composite, spin-half particle with
the electromagnetic field. We explain in detail how the NRQED Lagrangian is
constructed up to and including order $1/M^2$, where $M$ is the mass of the
spin-half particle. As a sample application, we derive the Thomson scattering
cross section for the low energy scattering of a photon and a possibly
composite spin-half particle.
| [
{
"created": "Tue, 24 Mar 2015 22:02:06 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Aug 2015 01:41:39 GMT",
"version": "v2"
}
] | 2015-08-18 | [
[
"Paz",
"Gil",
""
]
] | We present a pedagogical introduction to NRQED (non-relativistic quantum electrodynamics). NRQED is an effective field theory that describes the interaction of non-relativistic, possibly composite, spin-half particle with the electromagnetic field. We explain in detail how the NRQED Lagrangian is constructed up to and including order $1/M^2$, where $M$ is the mass of the spin-half particle. As a sample application, we derive the Thomson scattering cross section for the low energy scattering of a photon and a possibly composite spin-half particle. |
1403.2290 | Michael Klasen | M. Klasen, F. K\"onig | New information on photon fragmentation functions | 5 pages, 3 figures, 1 table | null | 10.1140/epjc/s10052-014-3009-x | MS-TP-14-11 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal photons radiated in heavy-ion collisions represent an important
signal for a recently discovered new state of matter, the deconfined
quark-gluon plasma. However, a clean identification of this signal requires
precise knowledge of the prompt photons produced simultaneously in hard
collisions of quarks and gluons, mostly through their fragmentation. In this
paper, we demonstrate that PHENIX data on photons produced in proton-proton
collisions with low transverse momenta allow to extract new information on this
fragmentation process. While existing data do not yet convincingly favor one
parameterization (BFG II) over the two other frequently used photon
fragmentation functions (BFG I and GRV NLO), the data sets recorded by PHENIX
and STAR at BNL RHIC in 2013 with tenfold higher statistics should allow for
such an analysis.
| [
{
"created": "Mon, 10 Mar 2014 16:22:52 GMT",
"version": "v1"
},
{
"created": "Fri, 23 May 2014 09:37:24 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Klasen",
"M.",
""
],
[
"König",
"F.",
""
]
] | Thermal photons radiated in heavy-ion collisions represent an important signal for a recently discovered new state of matter, the deconfined quark-gluon plasma. However, a clean identification of this signal requires precise knowledge of the prompt photons produced simultaneously in hard collisions of quarks and gluons, mostly through their fragmentation. In this paper, we demonstrate that PHENIX data on photons produced in proton-proton collisions with low transverse momenta allow to extract new information on this fragmentation process. While existing data do not yet convincingly favor one parameterization (BFG II) over the two other frequently used photon fragmentation functions (BFG I and GRV NLO), the data sets recorded by PHENIX and STAR at BNL RHIC in 2013 with tenfold higher statistics should allow for such an analysis. |
hep-ph/0503037 | Vladimir Majernik | V. Majernik | A Very Naive Model of Hadron with Negative Quintessence | 5 pages | null | null | null | hep-ph | null | A simple model of hadron which exhibits the quark confinement and the
asymptotic freedom is described. The hadron is modelled as a sphere of radius
equal to its Compton wavelength in which quarks occur surrounded by space with
the uniformly distributed {\it negative} vacuum energy density characterized by
$\lambda$. The acceleration stemming from this vacuum energy causes the quark
confinement. However, in the center of hadron quarks behave as practically free
particles. From the requirement that the Compton wavelength of a hadron should
remain constant while the scale factor varies with time we estimate the
strength of the vacuum energy density surrounding quarks. It follows that the
inward pressure of this vacuum energy is large enough to keep quarks inside the
hadron.
| [
{
"created": "Thu, 3 Mar 2005 15:39:33 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2005 10:15:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Majernik",
"V.",
""
]
] | A simple model of hadron which exhibits the quark confinement and the asymptotic freedom is described. The hadron is modelled as a sphere of radius equal to its Compton wavelength in which quarks occur surrounded by space with the uniformly distributed {\it negative} vacuum energy density characterized by $\lambda$. The acceleration stemming from this vacuum energy causes the quark confinement. However, in the center of hadron quarks behave as practically free particles. From the requirement that the Compton wavelength of a hadron should remain constant while the scale factor varies with time we estimate the strength of the vacuum energy density surrounding quarks. It follows that the inward pressure of this vacuum energy is large enough to keep quarks inside the hadron. |
1412.3616 | Yuta Orikasa | Hiroshi Okada and Yuta Orikasa | Classically Conformal Radiative Neutrino Model with Gauged B-L Symmetry | 19 pages, 3 figures, 2 tables; references added, accepted version for
publication in Physics Letters B | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a classically conformal radiative neutrino model with gauged B$-$L
symmetry, in which the B$-$L symmetry breaking can occur through the
Coleman-Weinberg mechanism. As a result, Majorana mass term is generated and EW
symmetry breaking also occurs. We show some allowed parameters to satisfy
several theoretical and experimental constraints. Theoretical constraints are
inert conditions and Coleman-Weinberg condition. Experimental bounds are lepton
flavor violation(especially \mu -> e \gamma), the current bound on the $Z'$
mass at LHC, in additions to the neutrino oscillations.
| [
{
"created": "Thu, 11 Dec 2014 11:48:55 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Dec 2014 15:12:47 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Aug 2016 05:38:41 GMT",
"version": "v3"
}
] | 2016-08-17 | [
[
"Okada",
"Hiroshi",
""
],
[
"Orikasa",
"Yuta",
""
]
] | We discuss a classically conformal radiative neutrino model with gauged B$-$L symmetry, in which the B$-$L symmetry breaking can occur through the Coleman-Weinberg mechanism. As a result, Majorana mass term is generated and EW symmetry breaking also occurs. We show some allowed parameters to satisfy several theoretical and experimental constraints. Theoretical constraints are inert conditions and Coleman-Weinberg condition. Experimental bounds are lepton flavor violation(especially \mu -> e \gamma), the current bound on the $Z'$ mass at LHC, in additions to the neutrino oscillations. |
2109.07405 | Jorge Alda | Jorge Alda, Jaume Guasch and Siannah Penaranda | Using Machine Learning techniques in phenomenological studies in flavour
physics | 44 pages, 12 figures, 1 appendix. Version published on JHEP. Extended
discussion and added a simplified leptoquark model, conclusions unchanged | J. High Energ. Phys. 2022, 115 (2022) | 10.1007/JHEP07(2022)115 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An updated analysis of New Physics violating Lepton Flavour Universality, by
using the Standard Model Effective Field Lagrangian with semileptonic dimension
six operators at $\Lambda = 1\,\mathrm{TeV}$ is presented. We perform a global
fit, by discussing the relevance of the mixing in the first generation. We use
for the first time in this context a Montecarlo analysis to extract the
confidence intervals and correlations between observables. Our results show
that machine learning, made jointly with the SHAP values, constitute a suitable
strategy to use in this kind of analysis.
| [
{
"created": "Wed, 15 Sep 2021 16:22:31 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2022 06:17:06 GMT",
"version": "v2"
}
] | 2022-07-29 | [
[
"Alda",
"Jorge",
""
],
[
"Guasch",
"Jaume",
""
],
[
"Penaranda",
"Siannah",
""
]
] | An updated analysis of New Physics violating Lepton Flavour Universality, by using the Standard Model Effective Field Lagrangian with semileptonic dimension six operators at $\Lambda = 1\,\mathrm{TeV}$ is presented. We perform a global fit, by discussing the relevance of the mixing in the first generation. We use for the first time in this context a Montecarlo analysis to extract the confidence intervals and correlations between observables. Our results show that machine learning, made jointly with the SHAP values, constitute a suitable strategy to use in this kind of analysis. |
1801.08419 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the triply-charmed pentaquark states with QCD sum rules | 14 pages, 8 figures | Eur. Phys. J. C78 (2018) 300 | 10.1140/epjc/s10052-018-5786-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we construct the scalar-diquark-scalar-diquark-antiquark
type current to study the ground state triply charmed pentaquark states with
the QCD sum rules. We separate the contributions of the negative-parity and
positive parity triply charmed pentaquark states explicitly, and take the
energy scale formula $\mu=\sqrt{M^2_{P}-(3{\mathbb{M}}_c)^2}$ to determine the
optimal energy scales of the QCD spectral densities. The predicted pentaquark
masses can be confronted to the experimental data in the future.
| [
{
"created": "Wed, 24 Jan 2018 08:23:02 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2018 08:39:32 GMT",
"version": "v2"
}
] | 2018-04-18 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we construct the scalar-diquark-scalar-diquark-antiquark type current to study the ground state triply charmed pentaquark states with the QCD sum rules. We separate the contributions of the negative-parity and positive parity triply charmed pentaquark states explicitly, and take the energy scale formula $\mu=\sqrt{M^2_{P}-(3{\mathbb{M}}_c)^2}$ to determine the optimal energy scales of the QCD spectral densities. The predicted pentaquark masses can be confronted to the experimental data in the future. |
1704.05762 | Ali Alavi | M. S. Hosseini, S. A. Alavi | Breit-Wigner distribution, quantum beats and GSI Anomaly | 7 pages, 2 Figure | Annals of Physics, Volume 410, November 2019, 167936 | null | null | hep-ph nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relationship between Breit-Wigner distribution as an underlying basis for
decaying unstable quantum systems and GSI experiment (anomaly) has not been
addressed properly in the literatures. We show that quantum beats can be
obtained using a superposition of two Breit-Wigner distributions. This modified
distribution can explain the GSI time anomaly with quantum beats resulting from
the existence of two energy levels of the decaying ion.
| [
{
"created": "Wed, 19 Apr 2017 15:02:05 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2018 16:29:29 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Oct 2019 02:22:32 GMT",
"version": "v3"
}
] | 2019-10-07 | [
[
"Hosseini",
"M. S.",
""
],
[
"Alavi",
"S. A.",
""
]
] | The relationship between Breit-Wigner distribution as an underlying basis for decaying unstable quantum systems and GSI experiment (anomaly) has not been addressed properly in the literatures. We show that quantum beats can be obtained using a superposition of two Breit-Wigner distributions. This modified distribution can explain the GSI time anomaly with quantum beats resulting from the existence of two energy levels of the decaying ion. |
hep-ph/9212202 | null | Huazhong Zhang | Global Constraints of Gauss' Law and the Solution to the Strong CP
Problem | to be published in the Proceeding of DPF92 Meeting, Fermilab, Nov.
1992, latex 3 pages | null | null | JSUHEP921001 | hep-ph | null | This is a brief review on the work done recently. It is shown that the global
constraints of Gauss' law ensure that the vacuum angle must be quantized in
gauge theories with magnetic monopoles. Our quantization rule is given as
$\theta=0$, or $\theta=2\pi N/n~ (n\neq 0)$ with integer n being the relevant
topological charge of the magnetic monopole and N is an unfixed integer in this
approach. This theoretically confirms further the conclusion originally
proposed by the author$^1$ that the strong CP problem can be solved due to the
existence of magnetic monopoles, the fact that the strong CP-violation can be
only so small or vanishing may imply the existence of magnetic monopoles, and
the universe is open.
| [
{
"created": "Tue, 1 Dec 1992 16:31:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zhang",
"Huazhong",
""
]
] | This is a brief review on the work done recently. It is shown that the global constraints of Gauss' law ensure that the vacuum angle must be quantized in gauge theories with magnetic monopoles. Our quantization rule is given as $\theta=0$, or $\theta=2\pi N/n~ (n\neq 0)$ with integer n being the relevant topological charge of the magnetic monopole and N is an unfixed integer in this approach. This theoretically confirms further the conclusion originally proposed by the author$^1$ that the strong CP problem can be solved due to the existence of magnetic monopoles, the fact that the strong CP-violation can be only so small or vanishing may imply the existence of magnetic monopoles, and the universe is open. |
hep-ph/0603048 | Mikko Laine | M. Laine, Y. Schroder | Quark mass thresholds in QCD thermodynamics | 14 pages. v2: minor additions and clarifications; published version | Phys.Rev.D73:085009,2006 | 10.1103/PhysRevD.73.085009 | null | hep-ph | null | We discuss radiative corrections to how quark mass thresholds are crossed, as
a function of the temperature, in basic thermodynamic observables such as the
pressure, the energy and entropy densities, and the heat capacity of high
temperature QCD. The indication from leading order that the charm quark plays a
visible role at surprisingly low temperatures, is confirmed. We also sketch a
way to obtain phenomenological estimates relevant for generic expansion rate
computations at temperatures between the QCD and electroweak scales, pointing
out where improvements over the current knowledge are particularly welcome.
| [
{
"created": "Mon, 6 Mar 2006 16:28:06 GMT",
"version": "v1"
},
{
"created": "Fri, 5 May 2006 08:18:10 GMT",
"version": "v2"
}
] | 2011-08-01 | [
[
"Laine",
"M.",
""
],
[
"Schroder",
"Y.",
""
]
] | We discuss radiative corrections to how quark mass thresholds are crossed, as a function of the temperature, in basic thermodynamic observables such as the pressure, the energy and entropy densities, and the heat capacity of high temperature QCD. The indication from leading order that the charm quark plays a visible role at surprisingly low temperatures, is confirmed. We also sketch a way to obtain phenomenological estimates relevant for generic expansion rate computations at temperatures between the QCD and electroweak scales, pointing out where improvements over the current knowledge are particularly welcome. |
1102.3409 | Pasquale Di Bari | Pasquale Di Bari | Developments in Leptogenesis | 8 pages; 3 figures; talk at Neutrino 2010 | null | 10.1016/j.nuclphysbps.2012.09.048 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Latest developments in leptogenesis are reviewed with a particular emphasis
on the proposals to test leptogenesis. We discuss in particular the important
role played by light and heavy flavour effects in the determination of the
final asymmetry and the attractive features of the N_2 dominated scenario.
| [
{
"created": "Wed, 16 Feb 2011 19:22:08 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Di Bari",
"Pasquale",
""
]
] | Latest developments in leptogenesis are reviewed with a particular emphasis on the proposals to test leptogenesis. We discuss in particular the important role played by light and heavy flavour effects in the determination of the final asymmetry and the attractive features of the N_2 dominated scenario. |
2307.13895 | Francesco Costa | Francesco Costa and Stephen F. King | Neutrino mixing sum rules and the Littlest Seesaw | Fig 6 has been updated | Universe 2023, 9, 472 | 10.3390/universe9110472 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we study the neutrino mixing sum rules arising from discrete
symmetries, and the class of Littlest Seesaw (LS) neutrino models. These
symmetry based approaches all offer predictions for the cosine of the leptonic
CP phase $\cos \delta$ in terms of the mixing angles, $\theta_{13}$,
$\theta_{12}$, $\theta_{23}$, while the LS models also predict the sine of the
leptonic CP phase $\sin \delta$ as well as making other predictions. In
particular we study the \textit{solar} neutrino mixing sum rules, arising from
charged lepton corrections to Tri-bimaximal (TB), Bi-maximal (BM), Golden
Ratios (GRs) and Hexagonal (HEX) neutrino mixing, and \textit{atmospheric}
neutrino mixing sum rules, arising from preserving one of the columns of these
types of mixing, for example the first or second column of the TB mixing matrix
(TM1 or TM2), and confront them with an up-to-date global fit of the neutrino
oscillation data. We show that some mixing sum rules, for example an
\textit{atmospheric} neutrino mixing sum rule arising from a version of
neutrino Golden Ratio mixing (GRa1), are already excluded at 3$\sigma$, and
determine the remaining models allowed by the data. We also consider the more
predictive LS models (which obey the TM1 sum rules and offer further
predictions) based on constrained sequential dominance CSD($n$) with $n\approx
3$. We compare for the first time the three cases $n=2.5$, $n=3$ and
$n=1+\sqrt{6}\approx 3.45$ which are favoured by theoretical models, using a
new type of analysis to accurately predict the observables $\theta_{12}$,
$\theta_{23}$ and $\delta$. We study all the above approaches, \textit{solar}
and \textit{atmospheric} mixing sum rules and LS models, together so that they
may be compared, and to give an up to date analysis of the predictions of all
of these possibilities, when confronted with the most recent global fits.
| [
{
"created": "Wed, 26 Jul 2023 01:40:39 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2023 09:09:54 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Sep 2023 16:34:38 GMT",
"version": "v3"
},
{
"created": "Mon, 15 Apr 2024 16:02:17 GMT",
"version": "v4"
}
] | 2024-04-16 | [
[
"Costa",
"Francesco",
""
],
[
"King",
"Stephen F.",
""
]
] | In this work, we study the neutrino mixing sum rules arising from discrete symmetries, and the class of Littlest Seesaw (LS) neutrino models. These symmetry based approaches all offer predictions for the cosine of the leptonic CP phase $\cos \delta$ in terms of the mixing angles, $\theta_{13}$, $\theta_{12}$, $\theta_{23}$, while the LS models also predict the sine of the leptonic CP phase $\sin \delta$ as well as making other predictions. In particular we study the \textit{solar} neutrino mixing sum rules, arising from charged lepton corrections to Tri-bimaximal (TB), Bi-maximal (BM), Golden Ratios (GRs) and Hexagonal (HEX) neutrino mixing, and \textit{atmospheric} neutrino mixing sum rules, arising from preserving one of the columns of these types of mixing, for example the first or second column of the TB mixing matrix (TM1 or TM2), and confront them with an up-to-date global fit of the neutrino oscillation data. We show that some mixing sum rules, for example an \textit{atmospheric} neutrino mixing sum rule arising from a version of neutrino Golden Ratio mixing (GRa1), are already excluded at 3$\sigma$, and determine the remaining models allowed by the data. We also consider the more predictive LS models (which obey the TM1 sum rules and offer further predictions) based on constrained sequential dominance CSD($n$) with $n\approx 3$. We compare for the first time the three cases $n=2.5$, $n=3$ and $n=1+\sqrt{6}\approx 3.45$ which are favoured by theoretical models, using a new type of analysis to accurately predict the observables $\theta_{12}$, $\theta_{23}$ and $\delta$. We study all the above approaches, \textit{solar} and \textit{atmospheric} mixing sum rules and LS models, together so that they may be compared, and to give an up to date analysis of the predictions of all of these possibilities, when confronted with the most recent global fits. |
hep-ph/0103061 | Yurii Surovtsev | Yu.S. Surovtsev, D. Krupa and M. Nagy | Existence and Properties of the $f_0(665)$ State and Chiral Symmetry | 7 pages, LaTex; Talk given at the XV-th Int'l Seminar on High Energy
Physics Problems "Relativistic Nuclear Physics & Quantum Chromodynamics"
(Dubna, 25-30 September, 2000) | null | null | null | hep-ph | null | On the basis of a simultaneous description of the isoscalar s-wave of
$\pi\pi$ scattering (from the threshold up to 1.9 GeV) and of $\pi\pi\to
K\bar{K}$ process (from the threshold to $\sim$ 1.4 GeV) in the
model-independent approach, it is shown that there exists the $f_0(665)$ state
with properies of the $\sigma$-meson, the glueball nature of $f_0(1500)$ is
indicated, and the $f_0(1370)$ is assigned mainly to $s{\bar s}$ state. The
coupling constants of the observed states with $\pi\pi$ and $K\bar{K}$ systems
and scattering lengths $a_0^0(\pi\pi)$ and $a_0^0(K\bar{K})$ are calculated.
The existence of the $f_0(665)$ state and the obtained $\pi\pi$-scattering
length ($a_0^0\approx 0.27 m_{\pi^+}^{-1}$) seem to suggest the linear
realization of chiral symmetry.
| [
{
"created": "Tue, 6 Mar 2001 16:14:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Surovtsev",
"Yu. S.",
""
],
[
"Krupa",
"D.",
""
],
[
"Nagy",
"M.",
""
]
] | On the basis of a simultaneous description of the isoscalar s-wave of $\pi\pi$ scattering (from the threshold up to 1.9 GeV) and of $\pi\pi\to K\bar{K}$ process (from the threshold to $\sim$ 1.4 GeV) in the model-independent approach, it is shown that there exists the $f_0(665)$ state with properies of the $\sigma$-meson, the glueball nature of $f_0(1500)$ is indicated, and the $f_0(1370)$ is assigned mainly to $s{\bar s}$ state. The coupling constants of the observed states with $\pi\pi$ and $K\bar{K}$ systems and scattering lengths $a_0^0(\pi\pi)$ and $a_0^0(K\bar{K})$ are calculated. The existence of the $f_0(665)$ state and the obtained $\pi\pi$-scattering length ($a_0^0\approx 0.27 m_{\pi^+}^{-1}$) seem to suggest the linear realization of chiral symmetry. |
hep-ph/9510223 | Rudolph Hwa | I.M. Dremin and R. C. Hwa | Multiplicity Distributions of Squeezed Isospin States | 17 pages, 6 figures sent upon request (hwa@oregon.uoregon.edu) | Phys.Rev.D53:1216-1223,1996 | 10.1103/PhysRevD.53.1216 | OITS-578 | hep-ph nucl-th | null | Multiplicity distributions of neutral and charged particles arising from
squeezed coherent states are investigated. Projections onto global isospin
states are considered. We show how a small amount of squeezing can
significantly change the multiplicity distributions. The formalism is proposed
to describe the phenomenological properties of neutral and charged particles
anomalously produced in hadronic and nuclear collisions at very high energies.
| [
{
"created": "Wed, 4 Oct 1995 17:15:26 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Dremin",
"I. M.",
""
],
[
"Hwa",
"R. C.",
""
]
] | Multiplicity distributions of neutral and charged particles arising from squeezed coherent states are investigated. Projections onto global isospin states are considered. We show how a small amount of squeezing can significantly change the multiplicity distributions. The formalism is proposed to describe the phenomenological properties of neutral and charged particles anomalously produced in hadronic and nuclear collisions at very high energies. |
1611.09336 | Qing-Hong Cao | Qing-Hong Cao, Gang Li, Bin Yan, Dong-Ming Zhang, Hao Zhang | Double Higgs production at the 14 TeV LHC and the 100 TeV pp-collider | null | Phys. Rev. D 96, 095031 (2017) | 10.1103/PhysRevD.96.095031 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider effective Higgs boson couplings, including both the CP-even and
CP-odd couplings, that affect Higgs boson pair production in this study.
Through the partial wave analysis, we find that the process $gg\to hh$ is
dominated by the $s$-wave component even at a 100~TeV $pp$-collider. Making use
of the $s$-wave kinematics, we propose a cut efficiency function to mimic the
collider simulation and obtain the potential of measuring Higgs effective
couplings at the 14~TeV LHC with an integrated luminosity of $3000~{\rm
fb}^{-1}$ and at a 100 TeV $pp$-collider. Analytical expressions of the
$2\sigma$ exclusion limits at the LHC and the $5\sigma$ discovery bands at the
100 TeV machine are given.
| [
{
"created": "Mon, 28 Nov 2016 20:45:55 GMT",
"version": "v1"
}
] | 2017-12-06 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Li",
"Gang",
""
],
[
"Yan",
"Bin",
""
],
[
"Zhang",
"Dong-Ming",
""
],
[
"Zhang",
"Hao",
""
]
] | We consider effective Higgs boson couplings, including both the CP-even and CP-odd couplings, that affect Higgs boson pair production in this study. Through the partial wave analysis, we find that the process $gg\to hh$ is dominated by the $s$-wave component even at a 100~TeV $pp$-collider. Making use of the $s$-wave kinematics, we propose a cut efficiency function to mimic the collider simulation and obtain the potential of measuring Higgs effective couplings at the 14~TeV LHC with an integrated luminosity of $3000~{\rm fb}^{-1}$ and at a 100 TeV $pp$-collider. Analytical expressions of the $2\sigma$ exclusion limits at the LHC and the $5\sigma$ discovery bands at the 100 TeV machine are given. |
2303.11505 | Vladimir Komarov I. | Vladimir I. Komarov | Structure of Nucleons and Their Interaction in the Concept of
Nonperturbative QCD as a Pressing Issue of 21st-Century Physics | 6 pages | Phys. Part. Nucl. Lett. 19 (2022) 54 | 10.1134/S1547477122010083 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of the structure of nucleons and their interaction in the concept
of nonperturbative QCD is discussed as an approach to studying the
transformation of current quarks into constituent ones and the search for the
mechanism of such a transformation, creating the bulk of the nucleon mass.
Attention is drawn to the possibilities offered by studying central
nucleon-nucleon collisions in this aspect.
| [
{
"created": "Mon, 20 Mar 2023 23:54:55 GMT",
"version": "v1"
}
] | 2023-03-22 | [
[
"Komarov",
"Vladimir I.",
""
]
] | The problem of the structure of nucleons and their interaction in the concept of nonperturbative QCD is discussed as an approach to studying the transformation of current quarks into constituent ones and the search for the mechanism of such a transformation, creating the bulk of the nucleon mass. Attention is drawn to the possibilities offered by studying central nucleon-nucleon collisions in this aspect. |
2111.06465 | Moha Ouali | M Baouahi, I Dahiri, M Ouali, B Manaut, R Benbrik and S Taj | Two-body hadronic decay of $K^{+}$ in the presence of a circularly
polarized laser field | 13 pages, 4 figures | null | 10.1209/0295-5075/ac63dc | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this study, we have investigated the two-body hadronic decay of the
charged kaon, $ K^{+}\rightarrow\pi^{+}+\pi^{0} $, in the presence of a laser
field with circular polarization. We have derived, by analytical techniques,
the laser-assisted decay width and the branching ratio of the charged kaon
decay via the two-body hadronic channel. We have also taken into consideration
the impressive results obtained for the laser-assisted charged kaon decay via
the leptonic mode in order to understand more clearly the effect of the laser
field on the quantities related to the charged kaon decay such as the decay
width, the branching ratio and lifetime. A precise comparison of the ratios of
hadronic to muonic decay in the presence of the laser field is made to show
that the hadronic mode becomes slightly more important by increasing the laser
field intensity.
| [
{
"created": "Thu, 11 Nov 2021 21:18:59 GMT",
"version": "v1"
}
] | 2022-06-01 | [
[
"Baouahi",
"M",
""
],
[
"Dahiri",
"I",
""
],
[
"Ouali",
"M",
""
],
[
"Manaut",
"B",
""
],
[
"Benbrik",
"R",
""
],
[
"Taj",
"S",
""
]
] | In this study, we have investigated the two-body hadronic decay of the charged kaon, $ K^{+}\rightarrow\pi^{+}+\pi^{0} $, in the presence of a laser field with circular polarization. We have derived, by analytical techniques, the laser-assisted decay width and the branching ratio of the charged kaon decay via the two-body hadronic channel. We have also taken into consideration the impressive results obtained for the laser-assisted charged kaon decay via the leptonic mode in order to understand more clearly the effect of the laser field on the quantities related to the charged kaon decay such as the decay width, the branching ratio and lifetime. A precise comparison of the ratios of hadronic to muonic decay in the presence of the laser field is made to show that the hadronic mode becomes slightly more important by increasing the laser field intensity. |
2009.05789 | Xiao-Yun Wang | Xiao-Yun Wang, Wei Kou, Qing-Yong Lin, Ya-Ping Xie, Xurong Chen,
Alexey Guskov | Production of the bottomonium-like states $Z_b$ states at $e$-$h$ and
ultraperipheral $h$-$h$ collisions | 9 pages, 5 figures | Chin.Phys.C 45 (2021) 5, 054102 | 10.1088/1674-1137/abe3ec | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The photoproduction of bottomonium-like states $Z_{b}(10610)$ and
$Z_{b}(10650)$ via $\gamma p$ scattering is studied within an effectiv
Lagrangian approach and the vector-meson-dominance model. The Regge model is
employed to calculate the photoproduction of $Z_{b}$ states via $t$-channel
with $\pi$ exchange.The numerical results show that the values of the total
cross-sections of $Z_{b}(10610)$ and $Z_{b}(10650)$ can reach 0.09 nb and 0.02
nb, respectively, near the center of mass energy of 22 GeV. The experimental
measurements and studies on the photoproduction of $Z_{b}$ states near energy
region around $W\simeq 22$ GeV is suggested. Moreover, with the help of
eSTARlight and STARlight programs, one obtains the cross-sections and event
numbers of $Z_{b}(10610)$ production in electron-ion collision (EIC) and
Ultraperipheral collisions (UPCs). The results show that a considerable number
of events from $Z_{b}(10610)$ can be produced on the relevant experiments of
EICs and UPCs. Also, one calculates the rates and kinematic distributions for
$\gamma p\rightarrow Z_{b}n$ in $ep$ and $pA$ collisions via EICs and UPCs, and
the relevant results will provide an important reference for the RHIC, LHC,
EIC-US, LHeC, and FCC experiments to search for the bottomonium-like $Z_{b}$
states.
| [
{
"created": "Sat, 12 Sep 2020 13:25:45 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2020 05:19:37 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Aug 2021 03:10:04 GMT",
"version": "v3"
}
] | 2021-08-06 | [
[
"Wang",
"Xiao-Yun",
""
],
[
"Kou",
"Wei",
""
],
[
"Lin",
"Qing-Yong",
""
],
[
"Xie",
"Ya-Ping",
""
],
[
"Chen",
"Xurong",
""
],
[
"Guskov",
"Alexey",
""
]
] | The photoproduction of bottomonium-like states $Z_{b}(10610)$ and $Z_{b}(10650)$ via $\gamma p$ scattering is studied within an effectiv Lagrangian approach and the vector-meson-dominance model. The Regge model is employed to calculate the photoproduction of $Z_{b}$ states via $t$-channel with $\pi$ exchange.The numerical results show that the values of the total cross-sections of $Z_{b}(10610)$ and $Z_{b}(10650)$ can reach 0.09 nb and 0.02 nb, respectively, near the center of mass energy of 22 GeV. The experimental measurements and studies on the photoproduction of $Z_{b}$ states near energy region around $W\simeq 22$ GeV is suggested. Moreover, with the help of eSTARlight and STARlight programs, one obtains the cross-sections and event numbers of $Z_{b}(10610)$ production in electron-ion collision (EIC) and Ultraperipheral collisions (UPCs). The results show that a considerable number of events from $Z_{b}(10610)$ can be produced on the relevant experiments of EICs and UPCs. Also, one calculates the rates and kinematic distributions for $\gamma p\rightarrow Z_{b}n$ in $ep$ and $pA$ collisions via EICs and UPCs, and the relevant results will provide an important reference for the RHIC, LHC, EIC-US, LHeC, and FCC experiments to search for the bottomonium-like $Z_{b}$ states. |
1103.4038 | Andrej El | Andrej El, Ioannis Bouras, Francesco Lauciello, Zhe Xu and Carsten
Greiner | Dissipative hydrodynamics for relativistic multi-component systems | 4 pages, 1 figure | null | null | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Second-order dissipative hydrodynamic equations for each component of a
multi-component system are derived using the entropy principle. The shear
viscosity of the whole system, appearing in the equation summed-up over all
components, is related to the partial shear pressures and cannot be considered
as an external parameter. We demonstrate that it is essential to solve
hydrodynamic equations for each component, instead of treating a mixture as an
effective one-component system with a free parameter $\eta/s$. Thus,
extractions of the $\eta/s$ value of the QGP at RHIC and LHC have to be
reexamined.
| [
{
"created": "Mon, 21 Mar 2011 14:49:37 GMT",
"version": "v1"
}
] | 2011-03-24 | [
[
"El",
"Andrej",
""
],
[
"Bouras",
"Ioannis",
""
],
[
"Lauciello",
"Francesco",
""
],
[
"Xu",
"Zhe",
""
],
[
"Greiner",
"Carsten",
""
]
] | Second-order dissipative hydrodynamic equations for each component of a multi-component system are derived using the entropy principle. The shear viscosity of the whole system, appearing in the equation summed-up over all components, is related to the partial shear pressures and cannot be considered as an external parameter. We demonstrate that it is essential to solve hydrodynamic equations for each component, instead of treating a mixture as an effective one-component system with a free parameter $\eta/s$. Thus, extractions of the $\eta/s$ value of the QGP at RHIC and LHC have to be reexamined. |
2305.16781 | Krzysztof Jod{\l}owski | Krzysztof Jod{\l}owski | Looking forward to inelastic DM with electromagnetic form factors at
FASER and beam dump experiments | 19 pages, 7 figures. Fig. 2 added, minor changes in text, results
unchanged. Matches version accepted by PRD | null | null | CTPU-PTC-23-21 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inelastic Dark Matter (iDM) is an interesting thermal DM scenario that can
pose challenges for conventional detection methods. However, recent studies
demonstrated that iDM coupled to a photon by electric or magnetic dipole
moments can be effectively constrained by intensity frontier experiments using
the displaced single-photon decay signature. In this work, we show that by
utilizing additional signatures for such models, the sensitivity reach can be
increased towards the short-lived regime, $\gamma c\tau \sim O(1)\,$m, which
can occur in the region of the parameter space relevant to successful thermal
freeze-out. These processes are secondary iDM production taking place by
upscattering in front of the decay vessel and electron scattering.
Additionally, we consider dimension-6 scenarios of photon-coupled iDM - the
anapole moment and the charge radius operator - where the leading decay of the
heavier iDM state is $\chi_1 \to \chi_0 e^+ e^-$, resulting in a naturally
long-lived $\chi_1$. We find that the decays of $\chi_1$ at FASER2, MATHUSLA,
and SHiP will constrain these models more effectively than the scattering
signature considered for the elastic coupling case, while secondary production
yields similar constraints as the scattering.
| [
{
"created": "Fri, 26 May 2023 09:47:48 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2023 03:57:37 GMT",
"version": "v2"
}
] | 2023-11-30 | [
[
"Jodłowski",
"Krzysztof",
""
]
] | Inelastic Dark Matter (iDM) is an interesting thermal DM scenario that can pose challenges for conventional detection methods. However, recent studies demonstrated that iDM coupled to a photon by electric or magnetic dipole moments can be effectively constrained by intensity frontier experiments using the displaced single-photon decay signature. In this work, we show that by utilizing additional signatures for such models, the sensitivity reach can be increased towards the short-lived regime, $\gamma c\tau \sim O(1)\,$m, which can occur in the region of the parameter space relevant to successful thermal freeze-out. These processes are secondary iDM production taking place by upscattering in front of the decay vessel and electron scattering. Additionally, we consider dimension-6 scenarios of photon-coupled iDM - the anapole moment and the charge radius operator - where the leading decay of the heavier iDM state is $\chi_1 \to \chi_0 e^+ e^-$, resulting in a naturally long-lived $\chi_1$. We find that the decays of $\chi_1$ at FASER2, MATHUSLA, and SHiP will constrain these models more effectively than the scattering signature considered for the elastic coupling case, while secondary production yields similar constraints as the scattering. |
hep-ph/0109256 | David B. Kaplan | David B. Kaplan, Sanjay Reddy | Charged and superconducting vortices in dense quark matter | Replaced with the published version. A typographical error in Eq. 2
is corrected | Phys.Rev.Lett. 88 (2002) 132302 | 10.1103/PhysRevLett.88.132302 | null | hep-ph astro-ph nucl-th | null | Quark matter at astrophysical densities may contain stable vortices due to
the spontaneous breaking of hypercharge symmetry by kaon condensation. We argue
that these vortices could be both charged and electrically superconducting.
Current carrying loops (vortons) could be long lived and play a role in the
magnetic and transport properties of this matter. We provide a scenario for
vorton formation in protoneutron stars.
| [
{
"created": "Thu, 27 Sep 2001 02:10:45 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2001 21:52:24 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Jan 2003 15:04:19 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Kaplan",
"David B.",
""
],
[
"Reddy",
"Sanjay",
""
]
] | Quark matter at astrophysical densities may contain stable vortices due to the spontaneous breaking of hypercharge symmetry by kaon condensation. We argue that these vortices could be both charged and electrically superconducting. Current carrying loops (vortons) could be long lived and play a role in the magnetic and transport properties of this matter. We provide a scenario for vorton formation in protoneutron stars. |
1607.03750 | Jose Pelaez R. | J.R. Pel\'aez, A. Rodas | Calculation of Regge trajectories of strange resonances and
identification of the K0*(800) as a non-ordinary meson | To appear in the proceedings of Excited QCD 2016, Costa do Caparica,
Portugal, March 6-12 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review how the Regge trajectory of an elastic resonance can be obtained
just from its pole position and coupling, using a dispersive formalism. This
allows us to deal correctly with the finite widths of resonances in Regge
trajectories. In this way we can calculate the Regge trajectories for the
$K^*(892)$, $K_1(1400)$ and $K^*_0(1430)$, obtaining ordinary linear Regge
trajectories, expected for $q \bar q$ resonances. In contrast, for the
$K^*_0(800)$ meson, the resulting Regge trajectory is non-linear and with much
smaller slope, strongly supporting its non-ordinary nature.
| [
{
"created": "Wed, 13 Jul 2016 14:19:06 GMT",
"version": "v1"
}
] | 2016-07-14 | [
[
"Peláez",
"J. R.",
""
],
[
"Rodas",
"A.",
""
]
] | We review how the Regge trajectory of an elastic resonance can be obtained just from its pole position and coupling, using a dispersive formalism. This allows us to deal correctly with the finite widths of resonances in Regge trajectories. In this way we can calculate the Regge trajectories for the $K^*(892)$, $K_1(1400)$ and $K^*_0(1430)$, obtaining ordinary linear Regge trajectories, expected for $q \bar q$ resonances. In contrast, for the $K^*_0(800)$ meson, the resulting Regge trajectory is non-linear and with much smaller slope, strongly supporting its non-ordinary nature. |
1811.02572 | Samuel Homiller | Samuel Homiller and Patrick Meade | Measurement of the Triple Higgs Coupling at a HE-LHC | 29 pages, 7 figures; matches version published in JHEP | JHEP 03 (2019) 055 | 10.1007/JHEP03(2019)055 | YITP-SB-18-33 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The currently unmeasured triple Higgs coupling is one of the strong
motivations for future physics programs at the LHC and beyond. A sufficiently
precise measurement can lead to qualitative changes in our understanding of
electroweak symmetry breaking and the cosmological history of the Higgs
potential. As such, the quantitative measurement of this coupling is now one of
the benchmark measurements for any proposed collider. We study the capability
of a potential $27\,\mathrm{TeV}$ HE-LHC upgrade in measuring the Higgs
trilinear coupling via the di-Higgs production process in the
$b\bar{b}\gamma\gamma$ channel. We emphasize that a key background from single
Higgs production via gluon fusion has been underestimated and underappreciated
in prior studies. We perform a detailed study taking into account two different
potential detector scenarios, and validate against HL-LHC projections from
ATLAS. We find that the di-Higgs production process can be observed at $\geq
4.5 \sigma$, corresponding to a $\sim 40\%$ measurement of the Higgs
self-coupling, with $15\,\mathrm{ab}^{-1}$ of data at the HE-LHC.
| [
{
"created": "Tue, 6 Nov 2018 19:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 22 May 2020 15:27:27 GMT",
"version": "v2"
}
] | 2020-05-25 | [
[
"Homiller",
"Samuel",
""
],
[
"Meade",
"Patrick",
""
]
] | The currently unmeasured triple Higgs coupling is one of the strong motivations for future physics programs at the LHC and beyond. A sufficiently precise measurement can lead to qualitative changes in our understanding of electroweak symmetry breaking and the cosmological history of the Higgs potential. As such, the quantitative measurement of this coupling is now one of the benchmark measurements for any proposed collider. We study the capability of a potential $27\,\mathrm{TeV}$ HE-LHC upgrade in measuring the Higgs trilinear coupling via the di-Higgs production process in the $b\bar{b}\gamma\gamma$ channel. We emphasize that a key background from single Higgs production via gluon fusion has been underestimated and underappreciated in prior studies. We perform a detailed study taking into account two different potential detector scenarios, and validate against HL-LHC projections from ATLAS. We find that the di-Higgs production process can be observed at $\geq 4.5 \sigma$, corresponding to a $\sim 40\%$ measurement of the Higgs self-coupling, with $15\,\mathrm{ab}^{-1}$ of data at the HE-LHC. |
2208.03377 | Dmitry Gorbunov | Dmitry Gorbunov, Dmitry Kalashnikov, Pavel Pakhlov, Timofey Uglov | On direct observation of millicharged particles at $c$-$\tau$ factories
and other $e^+e^-$-colliders | 12 pages, 3 figures; v2: the background-free signature is introduced | null | 10.1016/j.physletb.2023.138033 | INR-TH-2022-016 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Hypothetical particles with tiny electric charges (millicharged particles or
MCPs) can be produced in electron-positron annihilation if kinematically
allowed. Typical searches for them at $e^+e^-$ colliders exploit a signature of
a single photon with missing energy carried away by the undetected MCP pair. We
put forward an idea to look alternatively for MCP energy deposits inside a
tracker, which is a direct observation. The new signature is relevant for
non-relativistic MCPs, and we illustrate its power on the example of the
$c$-$\tau$ factory, where we argued that the corresponding searches may be
background-free. We find that it can probe the MCP charge down to
$3\times10^{-3}$ of the electron charge for the MCP masses in ${\cal O}(5)$ MeV
vicinity of each energy beam value where the factory will collect a luminosity
of 100 fb$^{-1}$ in one year. This mass region is unreachable with the searches
for missing energy and single photon.
| [
{
"created": "Fri, 5 Aug 2022 20:17:01 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2023 15:11:22 GMT",
"version": "v2"
}
] | 2023-08-09 | [
[
"Gorbunov",
"Dmitry",
""
],
[
"Kalashnikov",
"Dmitry",
""
],
[
"Pakhlov",
"Pavel",
""
],
[
"Uglov",
"Timofey",
""
]
] | Hypothetical particles with tiny electric charges (millicharged particles or MCPs) can be produced in electron-positron annihilation if kinematically allowed. Typical searches for them at $e^+e^-$ colliders exploit a signature of a single photon with missing energy carried away by the undetected MCP pair. We put forward an idea to look alternatively for MCP energy deposits inside a tracker, which is a direct observation. The new signature is relevant for non-relativistic MCPs, and we illustrate its power on the example of the $c$-$\tau$ factory, where we argued that the corresponding searches may be background-free. We find that it can probe the MCP charge down to $3\times10^{-3}$ of the electron charge for the MCP masses in ${\cal O}(5)$ MeV vicinity of each energy beam value where the factory will collect a luminosity of 100 fb$^{-1}$ in one year. This mass region is unreachable with the searches for missing energy and single photon. |
1207.4495 | David London | Alakabha Datta, Murugeswaran Duraisamy and David London | New Physics in b -> s Transitions and the B_{d,s}^0 -> V_1 V_2 Angular
Analysis | 29 pages, 6 figures | null | 10.1103/PhysRevD.86.076011 | UMISS-HEP-2012-06; UdeM-GPP-TH-12-208 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suppose that there is new physics (NP) in b -> s transitions, and examine
its effect on the angular distribution of B_q^0 -> V_1 V_2 (q=d,s), where
V_{1,2} are vector mesons. We find that, in the presence of such NP, the
formulae relating the parameters of the untagged, time-integrated angular
distribution to certain observables (polarization fractions, CP-violating
triple-product asymmetries, CP-conserving interference term) must be modified
from their standard-model forms. This modification is due in part to a nonzero
B^0_q-Bbar^0_q width difference, which is significant only for B^0_s decays. We
re-analyze the B^0_s -> phi phi data to see the effect of these modifications.
As (Delta Gamma_s/2)/Gamma_s ~ 10%, there are O(10%) changes in the derived
observables. These are not large, but may be important given that one is
looking for signals of NP. In addition, if the NP contributes to the b -> s
decay, the measurement of the untagged time-dependent angular distribution
provides enough information to extract all the NP parameters.
| [
{
"created": "Wed, 18 Jul 2012 20:23:49 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Datta",
"Alakabha",
""
],
[
"Duraisamy",
"Murugeswaran",
""
],
[
"London",
"David",
""
]
] | We suppose that there is new physics (NP) in b -> s transitions, and examine its effect on the angular distribution of B_q^0 -> V_1 V_2 (q=d,s), where V_{1,2} are vector mesons. We find that, in the presence of such NP, the formulae relating the parameters of the untagged, time-integrated angular distribution to certain observables (polarization fractions, CP-violating triple-product asymmetries, CP-conserving interference term) must be modified from their standard-model forms. This modification is due in part to a nonzero B^0_q-Bbar^0_q width difference, which is significant only for B^0_s decays. We re-analyze the B^0_s -> phi phi data to see the effect of these modifications. As (Delta Gamma_s/2)/Gamma_s ~ 10%, there are O(10%) changes in the derived observables. These are not large, but may be important given that one is looking for signals of NP. In addition, if the NP contributes to the b -> s decay, the measurement of the untagged time-dependent angular distribution provides enough information to extract all the NP parameters. |
hep-ph/9505403 | Ramana | M. V. Ramana (Department of Physics, University of Toronto) | A New Physics Source of Hard Gluons in Top Quark Production | 8 pages, 3 Latex figures, Written version of talk given at the 17th
annual MRST meeting, Rochester, May 8-9, 1995 | null | null | null | hep-ph | null | We consider the contribution of new strongly interacting sector, with a
characteristic scale of half a TeV, to top quark production at the Tevatron.
The color-octet, isosinglet analog of the $\rho$ meson in this theory is
produced copiously in hadron colliders. If the mass of this resonance is less
than twice the mass of the lightest pseudo-Goldstone bosons, then an important
decay mode could be to the color-octet analog of the $\eta$ and a gluon. The
subsequent decay of this $\eta$ into $\ttbar$ gives rise to top quark events
with a hard gluon.
| [
{
"created": "Mon, 29 May 1995 15:20:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ramana",
"M. V.",
"",
"Department of Physics, University of Toronto"
]
] | We consider the contribution of new strongly interacting sector, with a characteristic scale of half a TeV, to top quark production at the Tevatron. The color-octet, isosinglet analog of the $\rho$ meson in this theory is produced copiously in hadron colliders. If the mass of this resonance is less than twice the mass of the lightest pseudo-Goldstone bosons, then an important decay mode could be to the color-octet analog of the $\eta$ and a gluon. The subsequent decay of this $\eta$ into $\ttbar$ gives rise to top quark events with a hard gluon. |
hep-ph/0410015 | David London | Justin Albert, Alakabha Datta and David London | A Measurement of gamma from the Decays Bd(t) -> D(*)+ D(*)- and Bd ->
Ds(*)+ D(*)- | 12 pages, latex, 4 figures (included) | Phys.Lett.B605:335-343,2005 | 10.1016/j.physletb.2004.11.046 | CALT-68-2524, UdeM-GPP-TH-04-127 | hep-ph hep-ex | null | Recently, it was proposed to use measurements of Bd(t) -> D(*)+ D(*)- and Bd
-> Ds(*)+ D(*)- decays to measure the CP phase gamma. In this paper, we present
the extraction of gamma using this method. We find that gamma is favored to lie
in one of the ranges [19.4o - 80.6o] (+ 0o or 180o), [120o - 147o] (+ 0o or
180o), or [160o - 174o] (+ 0o or 180o) at 68% confidence level (the (+ 0o or
180o) represents an additional ambiguity for each range). These constraints
come principally from the vector-vector final states; the vector-pseudoscalar
decays improve the results only slightly. Although, with present data, the
constraints disappear for larger confidence levels, this study does demonstrate
the feasibility of the method. Strong constraints on gamma can be obtained with
more data.
| [
{
"created": "Fri, 1 Oct 2004 13:14:18 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Albert",
"Justin",
""
],
[
"Datta",
"Alakabha",
""
],
[
"London",
"David",
""
]
] | Recently, it was proposed to use measurements of Bd(t) -> D(*)+ D(*)- and Bd -> Ds(*)+ D(*)- decays to measure the CP phase gamma. In this paper, we present the extraction of gamma using this method. We find that gamma is favored to lie in one of the ranges [19.4o - 80.6o] (+ 0o or 180o), [120o - 147o] (+ 0o or 180o), or [160o - 174o] (+ 0o or 180o) at 68% confidence level (the (+ 0o or 180o) represents an additional ambiguity for each range). These constraints come principally from the vector-vector final states; the vector-pseudoscalar decays improve the results only slightly. Although, with present data, the constraints disappear for larger confidence levels, this study does demonstrate the feasibility of the method. Strong constraints on gamma can be obtained with more data. |
2105.05095 | Jorge Alda | Jorge Alda, Jaume Guasch, Siannah Penaranda | Anomalies in B mesons decays: Present status and future collider
prospects | LaTeX, 15 pages, 6 figures, 4 tables. Talk presented at the
International Workshop on Future Linear Colliders (LCWS2021), 15-18 March
2021. C21-03-15.1. References updated. Comments added. Some typos corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The experimental measurements on flavour physics, in tension with Standard
Model predictions, exhibit large sources of Lepton Flavour Universality
violation. This note summarises an analysis of the effects of the global fits
to the Wilson coefficients assuming a model independent effective Hamiltonian
approach, by including a proposal of different scenarios to include the New
Physics contributions. Additionally, we include an overview of the impact of
the future generation of colliders in the field of B-meson anomalies.
| [
{
"created": "Tue, 11 May 2021 14:47:54 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 2021 14:33:49 GMT",
"version": "v2"
}
] | 2021-06-15 | [
[
"Alda",
"Jorge",
""
],
[
"Guasch",
"Jaume",
""
],
[
"Penaranda",
"Siannah",
""
]
] | The experimental measurements on flavour physics, in tension with Standard Model predictions, exhibit large sources of Lepton Flavour Universality violation. This note summarises an analysis of the effects of the global fits to the Wilson coefficients assuming a model independent effective Hamiltonian approach, by including a proposal of different scenarios to include the New Physics contributions. Additionally, we include an overview of the impact of the future generation of colliders in the field of B-meson anomalies. |
hep-ph/0007035 | Alejandro Cabo Montes De Oca | Alejandro Cabo and Marcos Rigol | Baryonic resonances mass spectrum from a modified perturbative QCD | 11 pages,1 figure, three tables; corrections for equations and tables
were introduced, references and content added | null | null | null | hep-ph hep-ex hep-lat | null | A recently proposed modified perturbation expansion for QCD is employed to
evaluate the quark self-energies. Results of the order of 1/3 of the nucleon
mass are obtained for the effective masses of the up and down quarks in a first
approximation. Also, the predicted flavor dependence of the calculated quarks
masses turns out to be the appropriate to well reproduce the spectrum of the
ground states within the various groups of hadronic resonances through the
simple addition of the evaluated constituent quark masses. The results suggests
to conjecture that the modified expansion, after also introducing quark
condensates in a same token as the gluonic ones, would be able to furnish a
natural explanation of the mass spectrum of the three generations of
fundamental fermions.
| [
{
"created": "Tue, 4 Jul 2000 20:15:12 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2001 16:46:43 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cabo",
"Alejandro",
""
],
[
"Rigol",
"Marcos",
""
]
] | A recently proposed modified perturbation expansion for QCD is employed to evaluate the quark self-energies. Results of the order of 1/3 of the nucleon mass are obtained for the effective masses of the up and down quarks in a first approximation. Also, the predicted flavor dependence of the calculated quarks masses turns out to be the appropriate to well reproduce the spectrum of the ground states within the various groups of hadronic resonances through the simple addition of the evaluated constituent quark masses. The results suggests to conjecture that the modified expansion, after also introducing quark condensates in a same token as the gluonic ones, would be able to furnish a natural explanation of the mass spectrum of the three generations of fundamental fermions. |
1808.01005 | Stephen King | Stephen F. King, Susana Molina Sedgwick, Samuel J. Rowley | Fitting high-energy Littlest Seesaw parameters using low-energy neutrino
data and leptogenesis | Typos corrected, references added. 25 pages, 20 figures | null | 10.1007/JHEP10(2018)184 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the four high-energy Littlest Seesaw parameters in the flavour
basis,namely two real Yukawa couplings plus the two right-handed neutrino
masses, can be determined by an excellent fit to the seven currently
constrained observables of low-energy neutrino data and leptogenesis. Taking
into account renormalisation group corrections, we estimate $\chi^2 \simeq
1.5-2.6$ for the three d.o.f., depending on the high-energy scale and the type
of non supersymmetric Littlest Seesaw model. We extract allowed ranges of
neutrino parameters from our fit data, including the approximate mu-tau
symmetric predictions $\theta_{23}=45^o\pm 1^o$ and $\delta = -90^o \pm 5^o $,
which, together with a normal mass ordering with $m_1=0$, will enable Littlest
Seesaw models to be tested in future neutrino experiments.
| [
{
"created": "Thu, 2 Aug 2018 20:05:26 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2018 20:37:20 GMT",
"version": "v2"
}
] | 2018-11-14 | [
[
"King",
"Stephen F.",
""
],
[
"Sedgwick",
"Susana Molina",
""
],
[
"Rowley",
"Samuel J.",
""
]
] | We show that the four high-energy Littlest Seesaw parameters in the flavour basis,namely two real Yukawa couplings plus the two right-handed neutrino masses, can be determined by an excellent fit to the seven currently constrained observables of low-energy neutrino data and leptogenesis. Taking into account renormalisation group corrections, we estimate $\chi^2 \simeq 1.5-2.6$ for the three d.o.f., depending on the high-energy scale and the type of non supersymmetric Littlest Seesaw model. We extract allowed ranges of neutrino parameters from our fit data, including the approximate mu-tau symmetric predictions $\theta_{23}=45^o\pm 1^o$ and $\delta = -90^o \pm 5^o $, which, together with a normal mass ordering with $m_1=0$, will enable Littlest Seesaw models to be tested in future neutrino experiments. |
2003.11494 | Juan Helo | Carolina Arbel\'aez R, Giovanna Cottin, Juan Carlos Helo, and Martin
Hirsch | Long-lived charged particles and multi-lepton signatures from neutrino
mass models | 14 pages, 9 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lepton number violation (LNV) is usually searched for by the LHC
collaborations using the same-sign di-lepton plus jet signature. In this paper
we discuss multi-lepton signals of LNV that can arise with experimentally
interesting rates in certain loop models of neutrino mass generation.
Interestingly, in such models the observed smallness of the active neutrino
masses, together with the high-multiplicity of the final states, leads in large
parts of the viable parameter space of such models to the prediction of
long-lived charged particles, that leave highly ionizing tracks in the
detectors. We focus on one particular 1-loop neutrino mass model in this class
and discuss its LHC phenomenology in some detail.
| [
{
"created": "Wed, 25 Mar 2020 16:53:27 GMT",
"version": "v1"
}
] | 2020-03-26 | [
[
"R",
"Carolina Arbeláez",
""
],
[
"Cottin",
"Giovanna",
""
],
[
"Helo",
"Juan Carlos",
""
],
[
"Hirsch",
"Martin",
""
]
] | Lepton number violation (LNV) is usually searched for by the LHC collaborations using the same-sign di-lepton plus jet signature. In this paper we discuss multi-lepton signals of LNV that can arise with experimentally interesting rates in certain loop models of neutrino mass generation. Interestingly, in such models the observed smallness of the active neutrino masses, together with the high-multiplicity of the final states, leads in large parts of the viable parameter space of such models to the prediction of long-lived charged particles, that leave highly ionizing tracks in the detectors. We focus on one particular 1-loop neutrino mass model in this class and discuss its LHC phenomenology in some detail. |
hep-ph/9909250 | Hiroshi Nunokawa | A. M. Gago, H. Nunokawa and R. Zukanovich Funchal | The Solar Neutrino Problem and Gravitationally Induced Long-wavelength
Neutrino Oscillation | RevTex file, 4 pages, 4 postscript figures | Phys.Rev.Lett. 84 (2000) 4035-4038 | 10.1103/PhysRevLett.84.4035 | IFUSP-DFN/99-034 | hep-ph astro-ph hep-ex | null | We have reexamined the possibility of explaining the solar neutrino problem
through long-wavelength neutrino oscillations induced by a tiny breakdown of
the weak equivalence principle of general relativity. We found that such
gravitationally induce oscillations can provide a viable solution to the solar
neutrino problem.
| [
{
"created": "Fri, 3 Sep 1999 22:55:29 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Sep 1999 00:26:01 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gago",
"A. M.",
""
],
[
"Nunokawa",
"H.",
""
],
[
"Funchal",
"R. Zukanovich",
""
]
] | We have reexamined the possibility of explaining the solar neutrino problem through long-wavelength neutrino oscillations induced by a tiny breakdown of the weak equivalence principle of general relativity. We found that such gravitationally induce oscillations can provide a viable solution to the solar neutrino problem. |
hep-ph/0512314 | Gungwon Kang | Chueng-Ryong Ji, Gungwon Kang, Jungjai Lee | Instanton-inspired Model of QCD Phase Transition and Bubble Dynamics | 19 pages, 32 figures | Phys.Rev.D73:085003,2006 | 10.1103/PhysRevD.73.085003 | null | hep-ph hep-th | null | We have reinvestigated the collision of gluonic bubbles in a SU(2) model of
QCD which was studied by Johnson, Choi and Kisslinger in the context of the
instanton-inspired model of QCD phase transition bubbles with plane wave
approximation. We discuss treacherous points of the instanton-inspired model
that cause the violation of causality due to the presence of imaginary gluon
fields. By constructing a new slightly modified Lorentzian model where we have
three independent real gluon fields, we reanalyzed the process of bubble
collisions. Our numerical results show some indication of forming a bubble wall
in colliding region.
| [
{
"created": "Fri, 23 Dec 2005 13:32:34 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Ji",
"Chueng-Ryong",
""
],
[
"Kang",
"Gungwon",
""
],
[
"Lee",
"Jungjai",
""
]
] | We have reinvestigated the collision of gluonic bubbles in a SU(2) model of QCD which was studied by Johnson, Choi and Kisslinger in the context of the instanton-inspired model of QCD phase transition bubbles with plane wave approximation. We discuss treacherous points of the instanton-inspired model that cause the violation of causality due to the presence of imaginary gluon fields. By constructing a new slightly modified Lorentzian model where we have three independent real gluon fields, we reanalyzed the process of bubble collisions. Our numerical results show some indication of forming a bubble wall in colliding region. |
1610.03486 | Lina Necib | Lina Necib, Jarrett Moon, Taritree Wongjirad, Janet M. Conrad | Boosted Dark Matter at Neutrino Experiments | 9 pages + Appendices, 7 figures. v2: Appendix B modified, conclusions
unchanged. Version appeared in PRD | Phys. Rev. D 95, 075018 (2017) | 10.1103/PhysRevD.95.075018 | MIT-CTP/4840 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current and future neutrino experiments can be used to discover dark matter,
not only in searches for dark matter annihilating to neutrinos, but also in
scenarios where dark matter itself scatters off Standard Model particles in the
detector. In this work, we study the sensitivity of different neutrino
detectors to a class of models called boosted dark matter, in which a
subdominant component of a dark sector acquires a large Lorentz boost today
through annihilation of a dominant component in a dark matter-dense region,
such as the galactic center or dwarf spheroidal galaxies. This analysis focuses
on the sensitivity of different neutrino detectors, specifically the
Cherenkov-based Super-K and the future argon-based DUNE to boosted dark matter
that scatters off electrons. We study the dependence of the expected limits on
the experimental features, such as energy threshold, volume and exposure in the
limit of constant scattering amplitude. We highlight experiment-specific
features that enable current and future neutrino experiments to be a powerful
tool in finding signatures of boosted dark matter.
| [
{
"created": "Tue, 11 Oct 2016 20:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Apr 2017 20:24:42 GMT",
"version": "v2"
}
] | 2017-04-19 | [
[
"Necib",
"Lina",
""
],
[
"Moon",
"Jarrett",
""
],
[
"Wongjirad",
"Taritree",
""
],
[
"Conrad",
"Janet M.",
""
]
] | Current and future neutrino experiments can be used to discover dark matter, not only in searches for dark matter annihilating to neutrinos, but also in scenarios where dark matter itself scatters off Standard Model particles in the detector. In this work, we study the sensitivity of different neutrino detectors to a class of models called boosted dark matter, in which a subdominant component of a dark sector acquires a large Lorentz boost today through annihilation of a dominant component in a dark matter-dense region, such as the galactic center or dwarf spheroidal galaxies. This analysis focuses on the sensitivity of different neutrino detectors, specifically the Cherenkov-based Super-K and the future argon-based DUNE to boosted dark matter that scatters off electrons. We study the dependence of the expected limits on the experimental features, such as energy threshold, volume and exposure in the limit of constant scattering amplitude. We highlight experiment-specific features that enable current and future neutrino experiments to be a powerful tool in finding signatures of boosted dark matter. |
hep-ph/9508343 | null | M. Carena, M. Quiros and C.E.M. Wagner | Effective potential methods and the Higgs mass spectrum in the MSSM | 35 pages, Latex, 9 uuencoded figures | Nucl.Phys.B461:407-436,1996 | 10.1016/0550-3213(95)00665-6 | CERN-TH/95-157, IEM-FT-106/95 | hep-ph | null | We generalize the analytical expressions for the two-loop leading-log neutral
Higgs boson masses and mixing angles to the case of general left- and
right-handed soft supersymmetry breaking stop and sbottom masses and
left--right mixing mass parameters ($m_Q, m_U, m_D, A_t, A_b$). This
generalization is essential for the computation of Higgs masses and couplings
in the presence of light stops. At high scales we use the minimal
supersymmetric standard model effective potential, while at low scales we
consider the two-Higgs doublet model (renormalization group improved) effective
potential, with general matching conditions at the thresholds where the squarks
decouple. We define physical (pole) masses for the top-quark, by including QCD
self-energies, and for the neutral Higgs bosons, by including the leading
one-loop electroweak self-energies where the top/stop and bottom/sbottom
sectors propagate. For $m_Q=m_U=m_D$ and moderate left--right mixing mass
parameters, for which the mass expansion in terms of renormalizable Higgs
quartic couplings is reliable, we find excellent agreement with previously
obtained results.
| [
{
"created": "Mon, 21 Aug 1995 22:10:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Carena",
"M.",
""
],
[
"Quiros",
"M.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] | We generalize the analytical expressions for the two-loop leading-log neutral Higgs boson masses and mixing angles to the case of general left- and right-handed soft supersymmetry breaking stop and sbottom masses and left--right mixing mass parameters ($m_Q, m_U, m_D, A_t, A_b$). This generalization is essential for the computation of Higgs masses and couplings in the presence of light stops. At high scales we use the minimal supersymmetric standard model effective potential, while at low scales we consider the two-Higgs doublet model (renormalization group improved) effective potential, with general matching conditions at the thresholds where the squarks decouple. We define physical (pole) masses for the top-quark, by including QCD self-energies, and for the neutral Higgs bosons, by including the leading one-loop electroweak self-energies where the top/stop and bottom/sbottom sectors propagate. For $m_Q=m_U=m_D$ and moderate left--right mixing mass parameters, for which the mass expansion in terms of renormalizable Higgs quartic couplings is reliable, we find excellent agreement with previously obtained results. |
1309.1438 | Marcus Vinicius Snovarski Fonseca | O. A. Battistel and G. Dallabona | From scale properties of physical amplitudes to a predictive formulation
of the Nambu-Jona-Lasinio model | null | Physical Review D 80, 085028 (2009) | 10.1103/PhysRevD.80.085028 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The predictive power of the NJL model is considered in the light of a novel
strategy to handle the divergences typical of perturbative calculations. The
referred calculational strategy eliminates unphysical dependencies on the
arbitrary choices for the routing of internal momenta and symmetry violating
terms. In the present work we extend a previous one on the same issue by
including vector interactions and performing the discussion in a more general
context: it is considered the role of scale arbitrariness for the consistency
of the calculations. We show that the imposition of arbitrary scale
independence for the consistent regularized amplitudes lead to additional
properties for the irreducible divergent objects. These properties allow us to
parametrize the remaining freedom in terms of a unique constant where resides
all the arbitrariness involved. By searching for the best value for the
arbitrary parameter we find a critical condition for the existence of an
acceptable physical value for the dynamically generated quark mass. Such
critical condition fixes the remaining arbitrariness turning the NJL into a
predictive model in the sense that its phenomenological consequences do not
depend on possible choices made in intermediary steps. Numerical results are
obtained for physical quantities like the vector and axial-vector masses and
their coupling constants as genuine predictions.
| [
{
"created": "Thu, 5 Sep 2013 18:50:58 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Battistel",
"O. A.",
""
],
[
"Dallabona",
"G.",
""
]
] | The predictive power of the NJL model is considered in the light of a novel strategy to handle the divergences typical of perturbative calculations. The referred calculational strategy eliminates unphysical dependencies on the arbitrary choices for the routing of internal momenta and symmetry violating terms. In the present work we extend a previous one on the same issue by including vector interactions and performing the discussion in a more general context: it is considered the role of scale arbitrariness for the consistency of the calculations. We show that the imposition of arbitrary scale independence for the consistent regularized amplitudes lead to additional properties for the irreducible divergent objects. These properties allow us to parametrize the remaining freedom in terms of a unique constant where resides all the arbitrariness involved. By searching for the best value for the arbitrary parameter we find a critical condition for the existence of an acceptable physical value for the dynamically generated quark mass. Such critical condition fixes the remaining arbitrariness turning the NJL into a predictive model in the sense that its phenomenological consequences do not depend on possible choices made in intermediary steps. Numerical results are obtained for physical quantities like the vector and axial-vector masses and their coupling constants as genuine predictions. |
1304.5926 | Hyun-Chul Kim | Ulugbek Yakhshiev and Hyun-Chul Kim | Transverse charge densities in the nucleon in nuclear matter | 8 pages, 20 figures | null | 10.1016/j.physletb.2013.08.004 | INHA-NTG-01/2013 | hep-ph hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated the transverse charge densities in the nucleon in nuclear
matter within the framework of the in-medium modified Skyrme model. The medium
modification of the nucleon electromagnetic form factors are first discussed.
The results show that the form factors in nuclear matter fall off faster than
those in free space, as the momentum transfer increases. As a result, the
charge radii of the nucleon become larger, as the nuclear matter density
increases. The transverse charge densities in the nucleon indicate that the
size of the nucleon tends to bulge out in nuclear matter. This salient feature
of the swelling is more clearly observed in the neutron case. When the proton
is transversely polarized, the transverse charge densities exhibit the
distortion due to the effects of the magnetization.
| [
{
"created": "Mon, 22 Apr 2013 12:24:05 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Yakhshiev",
"Ulugbek",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] | We investigated the transverse charge densities in the nucleon in nuclear matter within the framework of the in-medium modified Skyrme model. The medium modification of the nucleon electromagnetic form factors are first discussed. The results show that the form factors in nuclear matter fall off faster than those in free space, as the momentum transfer increases. As a result, the charge radii of the nucleon become larger, as the nuclear matter density increases. The transverse charge densities in the nucleon indicate that the size of the nucleon tends to bulge out in nuclear matter. This salient feature of the swelling is more clearly observed in the neutron case. When the proton is transversely polarized, the transverse charge densities exhibit the distortion due to the effects of the magnetization. |
hep-ph/9708471 | Lorenzo Magnea | Lorenzo Magnea (Nordita) and Rodolfo Russo (Politecnico di Torino) | String derivation of two-loop Feynman diagrams | 7 pages, 1 figure, contributed to Beyond the Standard Model V,
Balholm, Norway, April 1997. Latex with aipproc.sty | null | 10.1063/1.54495 | NORDITA-97/57 P | hep-ph | null | We briefly review the technology involved in extracting the field-theory
limit of multiloop bosonic string amplitudes, and we apply it to the evaluation
of simple two-loop diagrams involving scalars and gauge bosons.
| [
{
"created": "Wed, 27 Aug 1997 14:05:51 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Magnea",
"Lorenzo",
"",
"Nordita"
],
[
"Russo",
"Rodolfo",
"",
"Politecnico di Torino"
]
] | We briefly review the technology involved in extracting the field-theory limit of multiloop bosonic string amplitudes, and we apply it to the evaluation of simple two-loop diagrams involving scalars and gauge bosons. |
hep-ph/0101281 | Katrin Heitmann | Katrin Heitmann | Gauge Fields Out-Of-Equilibrium: A Gauge Invariant Formulation and the
Coulomb Gauge | 32 pages, 8 figures | Phys.Rev. D64 (2001) 045003 | 10.1103/PhysRevD.64.045003 | DO-TH 01/02, LA-01-356 | hep-ph | null | We study the abelian Higgs model out-of-equilibrium in two different
approaches, a gauge invariant formulation, proposed by Boyanovsky et al.
\cite{Boyanovsky:1996dc} and in the Coulomb gauge. We show that both approaches
become equivalent in a consistent one loop approximation. Furthermore, we carry
out a proper renormalization for the model in order to prepare the equations
for a numerical implementation. The additional degrees of freedom, which arise
in gauge theories, influence the behavior of the system dramatically. A
comparison with results in the 't Hooft-Feynman background gauge found by us
recently, shows very good agreement.
| [
{
"created": "Thu, 25 Jan 2001 00:15:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Heitmann",
"Katrin",
""
]
] | We study the abelian Higgs model out-of-equilibrium in two different approaches, a gauge invariant formulation, proposed by Boyanovsky et al. \cite{Boyanovsky:1996dc} and in the Coulomb gauge. We show that both approaches become equivalent in a consistent one loop approximation. Furthermore, we carry out a proper renormalization for the model in order to prepare the equations for a numerical implementation. The additional degrees of freedom, which arise in gauge theories, influence the behavior of the system dramatically. A comparison with results in the 't Hooft-Feynman background gauge found by us recently, shows very good agreement. |
2207.03495 | Martin Hoferichter | Gilberto Colangelo, Martin Hoferichter, Joachim Monnard, Jacobo Ruiz
de Elvira | Radiative corrections to the forward-backward asymmetry in
$e^+e^-\to\pi^+\pi^-$ | 16 pages, 3 figures; numerical results for the corrections included
as supplemental material; journal version | JHEP 08, 295 (2022) | 10.1007/JHEP08(2022)295 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the $C$-odd radiative corrections to $e^+e^-\to
\pi^+\pi^-$ in a dispersive formalism, concentrating on the leading pion-pole
contribution in the virtual box diagrams. In particular, we show how the effect
of a general pion vector form factor in the loop integral can be incorporated
in a model-independent way and how the cancellation of infrared singularities
proceeds in this case. The numerical results, dominated by the infrared
enhanced contributions, indicate significant corrections beyond scalar QED,
essentially confirming recent findings in generalized vector-meson-dominance
models.
| [
{
"created": "Thu, 7 Jul 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Sep 2022 17:51:35 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Colangelo",
"Gilberto",
""
],
[
"Hoferichter",
"Martin",
""
],
[
"Monnard",
"Joachim",
""
],
[
"de Elvira",
"Jacobo Ruiz",
""
]
] | We present a calculation of the $C$-odd radiative corrections to $e^+e^-\to \pi^+\pi^-$ in a dispersive formalism, concentrating on the leading pion-pole contribution in the virtual box diagrams. In particular, we show how the effect of a general pion vector form factor in the loop integral can be incorporated in a model-independent way and how the cancellation of infrared singularities proceeds in this case. The numerical results, dominated by the infrared enhanced contributions, indicate significant corrections beyond scalar QED, essentially confirming recent findings in generalized vector-meson-dominance models. |
2204.13935 | Vo Van Vien | V. V. Vien | Comment on "Flavored leptogenesis and neutrino mass with $A_4$ symmetry"
[JHEP12(2021)051, arXiv:2106.06773] | 6 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, in ref. \cite{A4Datta} Datta et al. [arXiv:2106.06773] proposed an
$A_4$ flavor symmetric model supplemented by $Z_2\times Z_3$ symmetry which can
accommodate the appropriate lepton mixing and neutrino masses via Type-I seesaw
mechanism. They have constructed a minimal model with only one $SU(2)_L$
doublet scalar and six flavons that generate a specific flavor structure,
favors the normal hierarchy of light neutrinos and narrows down the range of
Dirac CP violating phase. Taking into account the contribution of all invariant
terms, under all symmetries, is very important in the model building process,
however, in ref. \cite{A4Datta} the authors miss a Majorana mass term which
contributes to and changes the structure of the Majorana mass matrix of the
right handed neutrinos. In this comment paper, we point out the above issue and
provide a solution to fill in the missing term in ref. \cite{A4Datta}.
| [
{
"created": "Fri, 29 Apr 2022 08:25:33 GMT",
"version": "v1"
}
] | 2022-05-02 | [
[
"Vien",
"V. V.",
""
]
] | Recently, in ref. \cite{A4Datta} Datta et al. [arXiv:2106.06773] proposed an $A_4$ flavor symmetric model supplemented by $Z_2\times Z_3$ symmetry which can accommodate the appropriate lepton mixing and neutrino masses via Type-I seesaw mechanism. They have constructed a minimal model with only one $SU(2)_L$ doublet scalar and six flavons that generate a specific flavor structure, favors the normal hierarchy of light neutrinos and narrows down the range of Dirac CP violating phase. Taking into account the contribution of all invariant terms, under all symmetries, is very important in the model building process, however, in ref. \cite{A4Datta} the authors miss a Majorana mass term which contributes to and changes the structure of the Majorana mass matrix of the right handed neutrinos. In this comment paper, we point out the above issue and provide a solution to fill in the missing term in ref. \cite{A4Datta}. |
hep-ph/0205015 | Monoranjan Guchait | Monoranjan Guchait, D.P. Roy (TIFR) | Using Tau Polarization as a Distinctive SUGRA Signature at LHC | 13 pages, 3 figures. Minor changes and one reference added. Version
to be published in PLB. Reprot: TIFR/TH/02-13 | Phys.Lett.B541:356-361,2002 | 10.1016/S0370-2693(02)02269-4 | null | hep-ph | null | In the minimal SUGRA model the lighter tau slepton is expected to be the
second lightest superparticle over a large parameter range at large
$\tan\beta$. Consequently one expects a viable SUGRA signal at LHC in the tau
lepton channel coming from the decay of these tau sleptons. The model predicts
the polarization of this tau lepton to be +1 to a very good accuracy. We show
how this prediction can be tested by looking at the momentum fraction of the
tau-jet, carried by the charged prong, in its 1-prong hadronic decay channel.
| [
{
"created": "Thu, 2 May 2002 10:37:13 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2002 12:21:06 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Guchait",
"Monoranjan",
"",
"TIFR"
],
[
"Roy",
"D. P.",
"",
"TIFR"
]
] | In the minimal SUGRA model the lighter tau slepton is expected to be the second lightest superparticle over a large parameter range at large $\tan\beta$. Consequently one expects a viable SUGRA signal at LHC in the tau lepton channel coming from the decay of these tau sleptons. The model predicts the polarization of this tau lepton to be +1 to a very good accuracy. We show how this prediction can be tested by looking at the momentum fraction of the tau-jet, carried by the charged prong, in its 1-prong hadronic decay channel. |
0907.3555 | Kochelev Nikolai Innokentevich | Nikolai Kochelev | Role of anomalous chromomagnetic interaction in Pomeron and Odderon
structures and in gluon distribution | 12 pages, 9 figures, references and one figure added, extended
discussion | Phys.Part.Nucl.Lett.7:326-333,2010 | 10.1134/S1547477110050043 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the contribution arising from nonperturbative quark-gluon
chromomagnetic interaction to the high energy total quark-quark cross section
and to gluon distributions in nucleon. The estimation obtained within the
instanton model of QCD vacuum leads to the conclusion that this type of
interaction gives the dominating contribution to the Pomeron coupling with the
light quarks and to gluon distribution in light hadrons at small virtualities
of quarks and gluons. We argue that the Odderon, which is the $P=C=-1$ partner
of Pomeron, is governed by the spin-flip component related to nonperturbative
three-gluon exchange induced by anomalous quark-gluon chromomagnetic
interaction.
| [
{
"created": "Tue, 21 Jul 2009 06:53:22 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2010 07:16:40 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Kochelev",
"Nikolai",
""
]
] | We calculate the contribution arising from nonperturbative quark-gluon chromomagnetic interaction to the high energy total quark-quark cross section and to gluon distributions in nucleon. The estimation obtained within the instanton model of QCD vacuum leads to the conclusion that this type of interaction gives the dominating contribution to the Pomeron coupling with the light quarks and to gluon distribution in light hadrons at small virtualities of quarks and gluons. We argue that the Odderon, which is the $P=C=-1$ partner of Pomeron, is governed by the spin-flip component related to nonperturbative three-gluon exchange induced by anomalous quark-gluon chromomagnetic interaction. |
hep-ph/0408106 | Vadim Naumov | Konstantin S. Kuzmin (1 and 2), Vladimir V. Lyubushkin (1 and 3),
Vadim A. Naumov (1 and 4) ((1) Dubna, JINR, (2) Moscow, ITEP, (3) Irkutsk U.,
(4) Firenze U. & INFN, Firenze) | Extended Rein-Sehgal model for tau lepton production | Contribution to the 3rd International Workshop on Neutrino-Nucleus
Interactions in the Few-GeV Region, 17-21 March, Gran Sasso (Italy) | Nucl.Phys.Proc.Suppl.139:158-161,2005 | 10.1016/j.nuclphysbps.2004.11.213 | null | hep-ph hep-ex | null | The polarization density matrix formalism is employed to include the final
lepton mass and spin into the popular model by Rein and Sehgal for single pion
neutrinoproduction. We investigate the effect of the $\tau$ lepton mass on the
differential cross sections. The lepton polarization evaluated within the
extended RS model is compared against that follows from the single resonance
production model based upon the Rarita-Schwinger formalism with
phenomenological transition form factors.
| [
{
"created": "Sun, 8 Aug 2004 17:43:58 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Kuzmin",
"Konstantin S.",
"",
"1 and 2"
],
[
"Lyubushkin",
"Vladimir V.",
"",
"1 and 3"
],
[
"Naumov",
"Vadim A.",
"",
"1 and 4"
]
] | The polarization density matrix formalism is employed to include the final lepton mass and spin into the popular model by Rein and Sehgal for single pion neutrinoproduction. We investigate the effect of the $\tau$ lepton mass on the differential cross sections. The lepton polarization evaluated within the extended RS model is compared against that follows from the single resonance production model based upon the Rarita-Schwinger formalism with phenomenological transition form factors. |
1206.6616 | Raghunath Sahoo | Nirbhay K. Behera, Raghunath Sahoo, and Basanta K. Nandi | Constituent Quark Scaling of Strangeness Enhancement in Heavy-Ion
Collisions | 9 pages, 17 figures | Advances in High Energy Physics, Volume 2013 (2013), Article ID
273248, 11 pages | 10.1155/2013/273248 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the frame work of a nuclear overlap model, we estimate the number of
nucleon and quark participants in proton-proton, proton-nucleus and
nucleus-nucleus collisions. We observe the number of nucleon
($N_{N-part}$)-normalized enhancement of multi-strange particles which show a
monotonic increase with centrality, turns out to be a centrality independent
scaling behavior when normalized to number of constituent quarks participating
in the collision ($N_{q-part}$). In addition, we observe that the
$N_{q-part}$-normalized enhancement, when further normalized to the strangeness
content, shows a strangeness independent scaling behavior. This holds good at
top RHIC energy. However, the corresponding SPS data show a weak
$N_{q-part}$-scaling with strangeness scaling being violated at top SPS energy.
This scaling at RHIC indicates that the partonic degrees of freedom playing an
important role in the production of multi-strange particles. Top SPS energy, in
view of the above observations, shows a co-existence of hadronic and partonic
phases. We give a comparison of data with HIJING, AMPT and UrQMD models to
understand the particle production dynamics at different energies.
| [
{
"created": "Thu, 28 Jun 2012 10:17:51 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Aug 2013 12:17:56 GMT",
"version": "v2"
}
] | 2013-11-19 | [
[
"Behera",
"Nirbhay K.",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Nandi",
"Basanta K.",
""
]
] | In the frame work of a nuclear overlap model, we estimate the number of nucleon and quark participants in proton-proton, proton-nucleus and nucleus-nucleus collisions. We observe the number of nucleon ($N_{N-part}$)-normalized enhancement of multi-strange particles which show a monotonic increase with centrality, turns out to be a centrality independent scaling behavior when normalized to number of constituent quarks participating in the collision ($N_{q-part}$). In addition, we observe that the $N_{q-part}$-normalized enhancement, when further normalized to the strangeness content, shows a strangeness independent scaling behavior. This holds good at top RHIC energy. However, the corresponding SPS data show a weak $N_{q-part}$-scaling with strangeness scaling being violated at top SPS energy. This scaling at RHIC indicates that the partonic degrees of freedom playing an important role in the production of multi-strange particles. Top SPS energy, in view of the above observations, shows a co-existence of hadronic and partonic phases. We give a comparison of data with HIJING, AMPT and UrQMD models to understand the particle production dynamics at different energies. |
hep-ph/0212272 | Jens Erler | Jens Erler | Electroweak Standard Model and Precision Tests | 8 pages, 3 figures, Talk given at the X Mexican School of Particles
and Fields, Playa del Carmen, Mexico, 2002; few values updated in tables
(numerically insignificant), one reference added | AIP Conf.Proc. 670 (2003) 227-234 | 10.1063/1.1594339 | null | hep-ph | null | I give an introduction and overview of recent developments in high precision
tests of the Standard Model. This includes a summary of Z-pole measurements, a
brief account of the NuTeV result on neutrino-nucleon scattering, the anomalous
magnetic moment of the muon, and implications for the Higgs boson mass.
| [
{
"created": "Wed, 18 Dec 2002 20:17:16 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Dec 2002 00:53:15 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Erler",
"Jens",
""
]
] | I give an introduction and overview of recent developments in high precision tests of the Standard Model. This includes a summary of Z-pole measurements, a brief account of the NuTeV result on neutrino-nucleon scattering, the anomalous magnetic moment of the muon, and implications for the Higgs boson mass. |
1001.5240 | Claudio Coriano | Roberta Armillis, Claudio Coriano, Luigi Delle Rose, Marco Guzzi,
Antonio Mariano | The Effective Actions of Pseudoscalar and Scalar Particles in Theories
with Gauge and Conformal Anomalies | Presented by C. Coriano at the 9th Hellenic Workshop on Elementary
Particle Physics and Gravity, Corfu Summer Institute, Greece August 30
September 20, 2009 | null | 10.1002/prop.201000019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent work on the effective field theory description and the
phenomenology of axion-like and scalar particles in models characterized by
gauge and/or conformal anomalies.
| [
{
"created": "Thu, 28 Jan 2010 18:49:00 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Armillis",
"Roberta",
""
],
[
"Coriano",
"Claudio",
""
],
[
"Rose",
"Luigi Delle",
""
],
[
"Guzzi",
"Marco",
""
],
[
"Mariano",
"Antonio",
""
]
] | We review recent work on the effective field theory description and the phenomenology of axion-like and scalar particles in models characterized by gauge and/or conformal anomalies. |
2211.10165 | Xin Wang | Xin Wang, Yilin Wang, Shun Zhou | Accidental symmetries in the scalar potential of the Standard Model
extended with two Higgs triplets | 6 pages, 2 figures; Contribution to the Proceedings of the 41st
International Conference on High Energy Physics (ICHEP2022) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-Higgs-triplet model (2HTM) provides us with an attractive way to
simultaneously account for tiny neutrino masses and the observed
matter-antimatter asymmetry in our Universe. In this talk, we study the
accidental symmetries of the scalar potential in the 2HTM using the
bilinear-field formalism. Based on the group-theoretical arguments, we prove
that the maximal symmetry group is ${\rm SO(4)}$. We carefully analyze all the
subgroups of ${\rm SO(4)}$, and find that there are eight distinct kinds of
accidental symmetries in the scalar potential of the 2HTM.
| [
{
"created": "Fri, 18 Nov 2022 11:23:44 GMT",
"version": "v1"
}
] | 2022-11-21 | [
[
"Wang",
"Xin",
""
],
[
"Wang",
"Yilin",
""
],
[
"Zhou",
"Shun",
""
]
] | The two-Higgs-triplet model (2HTM) provides us with an attractive way to simultaneously account for tiny neutrino masses and the observed matter-antimatter asymmetry in our Universe. In this talk, we study the accidental symmetries of the scalar potential in the 2HTM using the bilinear-field formalism. Based on the group-theoretical arguments, we prove that the maximal symmetry group is ${\rm SO(4)}$. We carefully analyze all the subgroups of ${\rm SO(4)}$, and find that there are eight distinct kinds of accidental symmetries in the scalar potential of the 2HTM. |
1209.0077 | Marcus Bluhm | M. Bluhm (SUBATECH, Nantes & CERN), P. B. Gossiaux, J. Aichelin
(SUBATECH, Nantes) | Radiative energy loss of relativistic charged particles in absorptive
media | 4 pages, Proceedings of the 5th International Conference on Hard and
Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2012),
27 May - 1 June 2012, Cagliari, Italy | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the energy loss spectrum per time-interval of a relativistic
charge traversing a dispersive medium. Polarization and absorption effects in
the medium are modelled via a complex index of refraction. We find that the
spectrum amplitude becomes exponentially damped due to absorption mechanisms.
Taking explicitly the effect of multiple scatterings on the charge trajectory
into account, we confirm results obtained in a previous work.
| [
{
"created": "Sat, 1 Sep 2012 10:04:05 GMT",
"version": "v1"
}
] | 2012-09-04 | [
[
"Bluhm",
"M.",
"",
"SUBATECH, Nantes & CERN"
],
[
"Gossiaux",
"P. B.",
"",
"SUBATECH, Nantes"
],
[
"Aichelin",
"J.",
"",
"SUBATECH, Nantes"
]
] | We determine the energy loss spectrum per time-interval of a relativistic charge traversing a dispersive medium. Polarization and absorption effects in the medium are modelled via a complex index of refraction. We find that the spectrum amplitude becomes exponentially damped due to absorption mechanisms. Taking explicitly the effect of multiple scatterings on the charge trajectory into account, we confirm results obtained in a previous work. |
hep-ph/0612102 | S Dev Sharma | S. Dev, Sanjeev Kumar, Surender Verma and Shivani Gupta | Phenomenology of Two-Texture Zero Neutrino Mass Matrices | 25 pages, 8 figures, final version with minor changes, published in
Phys. Rev. D | Phys.Rev.D76:013002,2007 | 10.1103/PhysRevD.76.013002 | null | hep-ph | null | The generic predictions of two-texture zero neutrino mass matrices in the
flavor basis have been examined especially in relation to the degeneracies
between mass matrices within a class and interesting constraints on the
neutrino parameters have been obtained. It is shown that the knowledge of the
octant of $\theta_{23}$, the sign of $\cos\delta$ and neutrino mass hierarchy
can be used to lift these degeneracies.
| [
{
"created": "Sat, 9 Dec 2006 06:14:15 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2007 11:39:56 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Aug 2007 09:22:15 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Dev",
"S.",
""
],
[
"Kumar",
"Sanjeev",
""
],
[
"Verma",
"Surender",
""
],
[
"Gupta",
"Shivani",
""
]
] | The generic predictions of two-texture zero neutrino mass matrices in the flavor basis have been examined especially in relation to the degeneracies between mass matrices within a class and interesting constraints on the neutrino parameters have been obtained. It is shown that the knowledge of the octant of $\theta_{23}$, the sign of $\cos\delta$ and neutrino mass hierarchy can be used to lift these degeneracies. |
1510.01235 | Volodymyr Vovchenko | V. Vovchenko, M.I. Gorenstein, L.M. Satarov, I.N. Mishustin, L.P.
Csernai, I. Kisel, H. Stoecker | Entropy production in chemically non-equilibrium quark-gluon plasma
created in central Pb+Pb collisions at LHC energies | 19 pages, 6 figures, minor changes to match published version | Phys. Rev. C 93, 014906 (2016) | 10.1103/PhysRevC.93.014906 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility that partonic matter produced at early stage of
ultrarelativistic heavy-ion collisions is out of chemical equilibrium. It is
assumed that initially this matter is mostly composed of gluons, but quarks and
antiquarks are produced at later times. The dynamical evolution of partonic
system is described by the Bjorken-like ideal hydrodynamics with a time
dependent quark fugacity. The results of this model are compared with those
obtained by assuming the complete chemical equilibrium of partons already at
the initial stage. It is shown that in a chemically non-equilibrium scenario
the entropy gradually increases, and about 25% of the total final entropy is
generated during the hydrodynamic evolution of deconfined matter. We argue that
the (anti)quark suppression included in this approach may be responsible for
reduced (anti)baryon to meson ratios observed in heavy-ion collisions at LHC
energies.
| [
{
"created": "Mon, 5 Oct 2015 17:06:20 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2016 17:18:11 GMT",
"version": "v2"
}
] | 2016-01-21 | [
[
"Vovchenko",
"V.",
""
],
[
"Gorenstein",
"M. I.",
""
],
[
"Satarov",
"L. M.",
""
],
[
"Mishustin",
"I. N.",
""
],
[
"Csernai",
"L. P.",
""
],
[
"Kisel",
"I.",
""
],
[
"Stoecker",
"H.",
""
]
] | We study the possibility that partonic matter produced at early stage of ultrarelativistic heavy-ion collisions is out of chemical equilibrium. It is assumed that initially this matter is mostly composed of gluons, but quarks and antiquarks are produced at later times. The dynamical evolution of partonic system is described by the Bjorken-like ideal hydrodynamics with a time dependent quark fugacity. The results of this model are compared with those obtained by assuming the complete chemical equilibrium of partons already at the initial stage. It is shown that in a chemically non-equilibrium scenario the entropy gradually increases, and about 25% of the total final entropy is generated during the hydrodynamic evolution of deconfined matter. We argue that the (anti)quark suppression included in this approach may be responsible for reduced (anti)baryon to meson ratios observed in heavy-ion collisions at LHC energies. |
hep-ph/0311268 | Mikko Laine | M. Laine, M. Vepsalainen | Mesonic correlation lengths in high-temperature QCD | 25 pages. v2: small clarifications; published version | JHEP 0402 (2004) 004 | 10.1088/1126-6708/2004/02/004 | null | hep-ph hep-lat | null | We consider spatial correlation lengths \xi for various QCD light quark
bilinears at temperatures above a few hundred MeV. Some of the correlation
lengths (such as that related to baryon density) coincide with what has been
measured earlier on from glueball-like states; others do not couple to
glueballs, and have a well-known perturbative leading-order expression as well
as a computable next-to-leading-order correction. We determine the latter
following analogies with the NRQCD effective theory, used for the study of
heavy quarkonia at zero temperature: we find (for the quenched case) \xi^{-1} =
2 \pi T + 0.1408 g^2 T, and compare with lattice results. One manifestation of
U_A(1) symmetry non-restoration is also pointed out.
| [
{
"created": "Fri, 21 Nov 2003 08:02:47 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Mar 2004 10:54:31 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Laine",
"M.",
""
],
[
"Vepsalainen",
"M.",
""
]
] | We consider spatial correlation lengths \xi for various QCD light quark bilinears at temperatures above a few hundred MeV. Some of the correlation lengths (such as that related to baryon density) coincide with what has been measured earlier on from glueball-like states; others do not couple to glueballs, and have a well-known perturbative leading-order expression as well as a computable next-to-leading-order correction. We determine the latter following analogies with the NRQCD effective theory, used for the study of heavy quarkonia at zero temperature: we find (for the quenched case) \xi^{-1} = 2 \pi T + 0.1408 g^2 T, and compare with lattice results. One manifestation of U_A(1) symmetry non-restoration is also pointed out. |
1406.2368 | Boris Panes bapanes | Giovanna Cottin, Marco A. D\'iaz, Mar\'ia Jos\'e Guzm\'an and Boris
Panes | Gravitino Dark Matter in Split Supersymmetry with Bilinear R-Parity
Violation | 35 pages, 7 figures. References added, typos corrected and
experimental constraints updated. Some clarifications added in Section 2.
Version to appear in EPJC | Eur. Phys. J. C (2014) 74:3138 | 10.1140/epjc/s10052-014-3138-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Split-SUSY with BRpV we show that the Gravitino DM solution is consistent
with experimental evidence on its relic density and life time. We arrive at
this conclusion by performing a complete numerical and algebraic study of the
parameter space, including constraints from the recently determined Higgs mass,
updated neutrino physics, and BBN constraints on NLSP decays. The Higgs mass
requires a relatively low Split-SUSY mass scale, which is naturally smaller
than usual values for reheating temperature, allowing the use of the standard
expression for the relic density. We include restrictions from neutrino physics
with three generations, and notice that the gravitino decay width depends on
the atmospheric neutrino mass scale. We calculate the neutralino decay rate and
find it consistent with BBN. We mention some implications on indirect DM
searches.
| [
{
"created": "Mon, 9 Jun 2014 21:39:32 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jul 2014 16:05:35 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Oct 2014 16:35:52 GMT",
"version": "v3"
}
] | 2015-01-26 | [
[
"Cottin",
"Giovanna",
""
],
[
"Díaz",
"Marco A.",
""
],
[
"Guzmán",
"María José",
""
],
[
"Panes",
"Boris",
""
]
] | In Split-SUSY with BRpV we show that the Gravitino DM solution is consistent with experimental evidence on its relic density and life time. We arrive at this conclusion by performing a complete numerical and algebraic study of the parameter space, including constraints from the recently determined Higgs mass, updated neutrino physics, and BBN constraints on NLSP decays. The Higgs mass requires a relatively low Split-SUSY mass scale, which is naturally smaller than usual values for reheating temperature, allowing the use of the standard expression for the relic density. We include restrictions from neutrino physics with three generations, and notice that the gravitino decay width depends on the atmospheric neutrino mass scale. We calculate the neutralino decay rate and find it consistent with BBN. We mention some implications on indirect DM searches. |
hep-ph/9810439 | Geraldine Servant | James M. Cline, Michael Mostoslavsky, Geraldine Servant | Numerical Study of Hawking Radiation Photosphere Formation around
Microscopic Black Holes | 25 pages, Latex, 33 figures ; some incorrect references fixed | Phys. Rev. D 59, 063009 (1999) | 10.1103/PhysRevD.59.063009 | McGill/98-19 | hep-ph astro-ph | null | Heckler has recently argued that the Hawking radiation emitted from
microscopic black holes has sufficiently strong interactions above a certain
critical temperature that it forms a photosphere, analogous to that of the sun.
In this case, the visible radiation is much cooler than the central temperature
at the Schwarzschild radius, in contrast to the naive expectation for the
observable spectrum. We investigate these ideas more quantitatively by solving
the Boltzmann equation using the test particle method. We confirm that at least
two kinds of photospheres may form: a quark-gluon plasma for black holes of
mass M_{BH} < 5 times 10^{14} g and an electron-positron-photon plasma for
M_{BH} < 2 times 10^{12} g. The QCD photosphere extends from the black hole
horizon to a distance of 0.2--4.0 fm for 10^9 g < M_{BH} < 5 10^{14} g, at
which point quarks and gluons with average energy of order \Lambda_{QCD}
hadronize. The QED photosphere starts at a distance of approximately 700 black
hole radii and dissipates at about 400 fm, where the average energy of the
emitted electrons, positrons and photons is inversely proportional to the black
hole temperature, and significantly higher than was found by Heckler. The
consequences of these photospheres for the cosmic diffuse gamma ray and
antiproton backgrounds are discussed: bounds on the black hole contribution to
the density of the universe are slightly weakened.
| [
{
"created": "Wed, 21 Oct 1998 19:10:21 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Oct 1998 18:18:55 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Cline",
"James M.",
""
],
[
"Mostoslavsky",
"Michael",
""
],
[
"Servant",
"Geraldine",
""
]
] | Heckler has recently argued that the Hawking radiation emitted from microscopic black holes has sufficiently strong interactions above a certain critical temperature that it forms a photosphere, analogous to that of the sun. In this case, the visible radiation is much cooler than the central temperature at the Schwarzschild radius, in contrast to the naive expectation for the observable spectrum. We investigate these ideas more quantitatively by solving the Boltzmann equation using the test particle method. We confirm that at least two kinds of photospheres may form: a quark-gluon plasma for black holes of mass M_{BH} < 5 times 10^{14} g and an electron-positron-photon plasma for M_{BH} < 2 times 10^{12} g. The QCD photosphere extends from the black hole horizon to a distance of 0.2--4.0 fm for 10^9 g < M_{BH} < 5 10^{14} g, at which point quarks and gluons with average energy of order \Lambda_{QCD} hadronize. The QED photosphere starts at a distance of approximately 700 black hole radii and dissipates at about 400 fm, where the average energy of the emitted electrons, positrons and photons is inversely proportional to the black hole temperature, and significantly higher than was found by Heckler. The consequences of these photospheres for the cosmic diffuse gamma ray and antiproton backgrounds are discussed: bounds on the black hole contribution to the density of the universe are slightly weakened. |
1903.11435 | Herbert Weigel | I. Takyi, H. Weigel | Nucleon Structure Functions from the NJL-Model Chiral Soliton | 23 pages, 11 figures | Eur. J. Phys. A, 55 (2019) 128 | 10.1140/epja/i2019-12806-3 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present numerical simulations for unpolarized and polarized structure
functions in a chiral soliton model. The soliton is constructed
self-consistently from quark fields from which the structure functions are
extracted. Central to the project is the implementation of regularizing the
Dirac sea (or vacuum) contribution to structure functions from first
principles. We discuss in detail how sum rules are realized at the level of the
quark wave-functions in momentum space. The comparison with experimental data
is convincing for the polarized structure functions but exhibits some
discrepancies in the unpolarized case. The vacuum contribution to the polarized
structure functions is particularly small.
| [
{
"created": "Wed, 27 Mar 2019 14:03:44 GMT",
"version": "v1"
}
] | 2019-08-23 | [
[
"Takyi",
"I.",
""
],
[
"Weigel",
"H.",
""
]
] | We present numerical simulations for unpolarized and polarized structure functions in a chiral soliton model. The soliton is constructed self-consistently from quark fields from which the structure functions are extracted. Central to the project is the implementation of regularizing the Dirac sea (or vacuum) contribution to structure functions from first principles. We discuss in detail how sum rules are realized at the level of the quark wave-functions in momentum space. The comparison with experimental data is convincing for the polarized structure functions but exhibits some discrepancies in the unpolarized case. The vacuum contribution to the polarized structure functions is particularly small. |
1006.3090 | Christoph Englert | Francisco Campanario, Christoph Englert, Michael Spannowsky | QCD corrections to non-standard WZ+jet production with leptonic decays
at the LHC | 6 pages, 8 figures. References added, published version | Phys.Rev.D82:054015,2010 | 10.1103/PhysRevD.82.054015 | FTUV-10-0612, KA-TP-16-2010, SFB/CPP-10-50 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the impact of anomalous WW$\gamma$ and WWZ couplings on WZ+jet
production at next-to-leading order QCD, including full leptonic decays of the
electroweak gauge bosons. While the inclusive hadronic cross sections do not
exhibit any particular sensitivity to anomalous couplings once the residual QCD
scale uncertainties are taken into account, the transverse momentum
distributions show substantial deviations from the Standard Model, provided
that the anomalous vertices are probed at large enough momentum transfers.
| [
{
"created": "Tue, 15 Jun 2010 20:47:08 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 2010 06:31:00 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Campanario",
"Francisco",
""
],
[
"Englert",
"Christoph",
""
],
[
"Spannowsky",
"Michael",
""
]
] | We discuss the impact of anomalous WW$\gamma$ and WWZ couplings on WZ+jet production at next-to-leading order QCD, including full leptonic decays of the electroweak gauge bosons. While the inclusive hadronic cross sections do not exhibit any particular sensitivity to anomalous couplings once the residual QCD scale uncertainties are taken into account, the transverse momentum distributions show substantial deviations from the Standard Model, provided that the anomalous vertices are probed at large enough momentum transfers. |
2206.10630 | Torsten Bringmann | Torsten Bringmann, Paul Frederik Depta, Marco Hufnagel, J\"orn
Kersten, Joshua T. Ruderman and Kai Schmidt-Hoberg | A new life for sterile neutrino dark matter after the pandemic | 12 pages revtex 4, 5 figures; matches published version | Phys.Rev.D 107 (2023) 7, L071702 | 10.1103/PhysRevD.107.L071702 | CERN-TH-2022-099, DESY 22-102, ULB-TH/22-09 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We propose a novel mechanism to generate sterile neutrinos $\nu_s$ in the
early Universe, by converting ordinary neutrinos $\nu_\alpha$ in scattering
processes $\nu_s\nu_\alpha\to\nu_s\nu_s$. After initial production by
oscillations, this leads to an exponential growth in the $\nu_s$ abundance. We
show that such a production regime naturally occurs for self-interacting
$\nu_s$, and that this opens up significant new parameter space where $\nu_s$
make up all of the observed dark matter. Our results provide strong motivation
to further push the sensitivity of X-ray line searches, and to improve on
constraints from structure formation.
| [
{
"created": "Tue, 21 Jun 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 2023 14:39:36 GMT",
"version": "v2"
}
] | 2023-04-28 | [
[
"Bringmann",
"Torsten",
""
],
[
"Depta",
"Paul Frederik",
""
],
[
"Hufnagel",
"Marco",
""
],
[
"Kersten",
"Jörn",
""
],
[
"Ruderman",
"Joshua T.",
""
],
[
"Schmidt-Hoberg",
"Kai",
""
]
] | We propose a novel mechanism to generate sterile neutrinos $\nu_s$ in the early Universe, by converting ordinary neutrinos $\nu_\alpha$ in scattering processes $\nu_s\nu_\alpha\to\nu_s\nu_s$. After initial production by oscillations, this leads to an exponential growth in the $\nu_s$ abundance. We show that such a production regime naturally occurs for self-interacting $\nu_s$, and that this opens up significant new parameter space where $\nu_s$ make up all of the observed dark matter. Our results provide strong motivation to further push the sensitivity of X-ray line searches, and to improve on constraints from structure formation. |
2211.15785 | Yueyang Ying | Yueyang Ying | Data-driven extraction of the substructure of quark and gluon jets in
proton-proton and heavy-ion collisions | MEng thesis | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The modification of quark- and gluon-initiated jets in the quark-gluon plasma
produced in heavy-ion collisions is a long-standing question that has not yet
received a definitive answer from experiments. In particular, the size of the
modifications in the quark-gluon plasma differs between theoretical models.
Therefore a fully data-driven technique is crucial for an unbiased extraction
of the quark and gluon jet spectra and substructure. Corroborating past
results, I demonstrate the capability of a fully data-driven technique called
topic modeling in separating quark and gluon contributions to jet observables.
The data-driven topic separation results can further be used to extract jet
substructures, such as jet shapes and jet fragmentation function, and their
respective QGP modifications. In addition, I propose the use of machine
learning constructed observables and demonstrate the potential to increase
separability for the input observable. This proof-of-concept study is based on
proton-proton and heavy-ion collision events from the PYQUEN generator with
statistics accessible in Run 4 of the Large Hadron Collider. These results
suggest the potential for an experimental determination of quark- and gluon-jet
spectra, their substructures, and their modification in the QGP.
| [
{
"created": "Mon, 28 Nov 2022 21:38:25 GMT",
"version": "v1"
}
] | 2022-11-30 | [
[
"Ying",
"Yueyang",
""
]
] | The modification of quark- and gluon-initiated jets in the quark-gluon plasma produced in heavy-ion collisions is a long-standing question that has not yet received a definitive answer from experiments. In particular, the size of the modifications in the quark-gluon plasma differs between theoretical models. Therefore a fully data-driven technique is crucial for an unbiased extraction of the quark and gluon jet spectra and substructure. Corroborating past results, I demonstrate the capability of a fully data-driven technique called topic modeling in separating quark and gluon contributions to jet observables. The data-driven topic separation results can further be used to extract jet substructures, such as jet shapes and jet fragmentation function, and their respective QGP modifications. In addition, I propose the use of machine learning constructed observables and demonstrate the potential to increase separability for the input observable. This proof-of-concept study is based on proton-proton and heavy-ion collision events from the PYQUEN generator with statistics accessible in Run 4 of the Large Hadron Collider. These results suggest the potential for an experimental determination of quark- and gluon-jet spectra, their substructures, and their modification in the QGP. |
1706.09909 | Daniele Teresi | Julian Heeck, Daniele Teresi | Cold keV dark matter from decays and scatterings | 19 pages, 6 figures. published version | Phys. Rev. D 96, 035018 (2017) | 10.1103/PhysRevD.96.035018 | ULB-TH/17-09 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore ways of creating cold keV-scale dark matter by means of decays and
scatterings. The main observation is that certain thermal freeze-in processes
can lead to a cold dark matter distribution in regions with small available
phase space. In this way the free-streaming length of keV particles can be
suppressed without decoupling them too much from the Standard Model. In all
cases, dark matter needs to be produced together with a heavy particle that
carries away most of the initial momentum. For decays, this simply requires an
off-diagonal DM coupling to two heavy particles; for scatterings, the coupling
of soft DM to two heavy particles needs to be diagonal, in particular in spin
space. Decays can thus lead to cold light DM of any spin, while scatterings
only work for bosons with specific couplings. We explore a number of simple
models and also comment on the connection to the tentative 3.5 keV line.
| [
{
"created": "Thu, 29 Jun 2017 18:01:29 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Jul 2017 10:51:55 GMT",
"version": "v2"
}
] | 2017-08-30 | [
[
"Heeck",
"Julian",
""
],
[
"Teresi",
"Daniele",
""
]
] | We explore ways of creating cold keV-scale dark matter by means of decays and scatterings. The main observation is that certain thermal freeze-in processes can lead to a cold dark matter distribution in regions with small available phase space. In this way the free-streaming length of keV particles can be suppressed without decoupling them too much from the Standard Model. In all cases, dark matter needs to be produced together with a heavy particle that carries away most of the initial momentum. For decays, this simply requires an off-diagonal DM coupling to two heavy particles; for scatterings, the coupling of soft DM to two heavy particles needs to be diagonal, in particular in spin space. Decays can thus lead to cold light DM of any spin, while scatterings only work for bosons with specific couplings. We explore a number of simple models and also comment on the connection to the tentative 3.5 keV line. |
2106.15849 | Qin-Tao Song | S. Kumano and Qin-Tao Song | Twist-2 relation and sum rule for tensor-polarized parton distribution
functions of spin-1 hadrons | 22 pages, J. High Energy Phys. in press | null | 10.1007/JHEP09(2021)141 | KEK-TH-2315, J-PARC-TH-0241 | hep-ph hep-ex hep-lat nucl-th | http://creativecommons.org/licenses/by/4.0/ | Sum rules for structure functions and their twist-2 relations have important
roles in constraining their magnitudes and $x$ dependencies and in studying
higher-twist effects. The Wandzura-Wilczek (WW) relation and the
Burkhardt-Cottingham (BC) sum rule are such examples for the polarized
structure functions $g_1$ and $g_2$. Recently, new twist-3 and twist-4 parton
distribution functions were proposed for spin-1 hadrons, so that it became
possible to investigate spin-1 structure functions including higher-twist ones.
We show in this work that an analogous twist-2 relation and a sum rule exist
for the tensor-polarized parton distribution functions $f_{1LL}$ and $f_{LT}$,
where $f_{1LL}$ is a twist-2 function and $f_{LT}$ is a twist-3 one. Namely,
the twist-2 part of $f_{LT}$ is expressed by an integral of $f_{1LL}$ (or
$b_1$) and the integral of the function $f_{2LT} = (2/3) f_{LT} -f_{1LL}$ over
$x$ vanishes. If the parton-model sum rule for $f_{1LL}$ ($b_1$) is applied by
assuming vanishing tensor-polarized antiquark distributions, another sum rule
also exists for $f_{LT}$ itself. These relations should be valuable for
studying tensor-polarized distribution functions of spin-1 hadrons and for
separating twist-2 components from higher-twist terms, as the WW relation and
BC sum rule have been used for investigating $x$ dependence and higher-twist
effects in $g_2$. In deriving these relations, we indicate that four twist-3
multiparton distribution functions $F_{LT}$, $G_{LT}$, $H_{LL}^\perp$, and
$H_{TT}$ exist for tensor-polarized spin-1 hadrons. These multiparton
distribution functions are also interesting to probe multiparton correlations
in spin-1 hadrons.
| [
{
"created": "Wed, 30 Jun 2021 07:08:22 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jul 2021 09:25:21 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Sep 2021 02:34:19 GMT",
"version": "v3"
}
] | 2021-10-13 | [
[
"Kumano",
"S.",
""
],
[
"Song",
"Qin-Tao",
""
]
] | Sum rules for structure functions and their twist-2 relations have important roles in constraining their magnitudes and $x$ dependencies and in studying higher-twist effects. The Wandzura-Wilczek (WW) relation and the Burkhardt-Cottingham (BC) sum rule are such examples for the polarized structure functions $g_1$ and $g_2$. Recently, new twist-3 and twist-4 parton distribution functions were proposed for spin-1 hadrons, so that it became possible to investigate spin-1 structure functions including higher-twist ones. We show in this work that an analogous twist-2 relation and a sum rule exist for the tensor-polarized parton distribution functions $f_{1LL}$ and $f_{LT}$, where $f_{1LL}$ is a twist-2 function and $f_{LT}$ is a twist-3 one. Namely, the twist-2 part of $f_{LT}$ is expressed by an integral of $f_{1LL}$ (or $b_1$) and the integral of the function $f_{2LT} = (2/3) f_{LT} -f_{1LL}$ over $x$ vanishes. If the parton-model sum rule for $f_{1LL}$ ($b_1$) is applied by assuming vanishing tensor-polarized antiquark distributions, another sum rule also exists for $f_{LT}$ itself. These relations should be valuable for studying tensor-polarized distribution functions of spin-1 hadrons and for separating twist-2 components from higher-twist terms, as the WW relation and BC sum rule have been used for investigating $x$ dependence and higher-twist effects in $g_2$. In deriving these relations, we indicate that four twist-3 multiparton distribution functions $F_{LT}$, $G_{LT}$, $H_{LL}^\perp$, and $H_{TT}$ exist for tensor-polarized spin-1 hadrons. These multiparton distribution functions are also interesting to probe multiparton correlations in spin-1 hadrons. |
hep-ph/0409037 | W. James Stirling | V. A. Khoze, A. D. Martin, M. G. Ryskin and W. J. Stirling | Diffractive gamma-gamma production at hadron colliders | 16 pages, 7 figures | Eur.Phys.J.C38:475-482,2005 | 10.1140/epjc/s2004-02059-0 | IPPP/04/55, DCPT/04/110 | hep-ph | null | We compute the cross section for exclusive double-diffractive gamma-gamma
production at the Tevatron, $p{\bar p} \to p + \gamma\gamma + {\bar p}$, and
the LHC. We evaluate both the gluon-gluon and quark-antiquark t-channel
exchange contributions to the process. The observation of exclusive gamma-gamma
production at the Tevatron will provide a check on the model predictions, and
offer an opportunity to confirm the expectations for exclusive
double-diffractive Higgs production at the LHC.
| [
{
"created": "Fri, 3 Sep 2004 15:41:37 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Stirling",
"W. J.",
""
]
] | We compute the cross section for exclusive double-diffractive gamma-gamma production at the Tevatron, $p{\bar p} \to p + \gamma\gamma + {\bar p}$, and the LHC. We evaluate both the gluon-gluon and quark-antiquark t-channel exchange contributions to the process. The observation of exclusive gamma-gamma production at the Tevatron will provide a check on the model predictions, and offer an opportunity to confirm the expectations for exclusive double-diffractive Higgs production at the LHC. |
hep-ph/0006101 | Igor Ivanov | I. P. Ivanov and N. N. Nikolaev | Diffractive Vector Meson Production In A Unified $\kappa$-Factorization
Approach | 3 pages, 1 figure, uses sprocl.sty, talk given at the DIS2000
conference, Liverpool, England, April 2000, to appear in the conference
proceedings | null | null | null | hep-ph | null | In the framework of the $\kappa$-factorization approach and on the basis of
recently determined DGSF, we calculated the production rates of ground and
excited (2S and D wave) states of vector mesons and investigated their various
kinematical and spin dependencies. We also addressed the issue of S/D wave
mixing in quarkonia.
| [
{
"created": "Sat, 10 Jun 2000 09:40:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ivanov",
"I. P.",
""
],
[
"Nikolaev",
"N. N.",
""
]
] | In the framework of the $\kappa$-factorization approach and on the basis of recently determined DGSF, we calculated the production rates of ground and excited (2S and D wave) states of vector mesons and investigated their various kinematical and spin dependencies. We also addressed the issue of S/D wave mixing in quarkonia. |
hep-ph/9610244 | Jorge Portoles | Giancarlo D'Ambrosio and Jorge Portoles | Vector meson exchange contributions to K --> pi gamma gamma and K(L) ->
gamma lepton+ lepton- | LaTeX file, 42 pages, 6 figures included as PS files, needs
rotating.sty (included) and epsf.sty. Shortened version accepted for
publication in Nuclear Physics B | Nucl.Phys. B492 (1997) 417-454 | 10.1016/S0550-3213(97)80040-5 | INFNNA-IV-96/21, DSFNA-IV-96/21 | hep-ph | null | We have studied in the framework of Chiral Perturbation Theory (ChPT) the
O(p^6) Vector Meson contributions to K -> pi gamma gamma and K(L) -> gamma
gamma^*. We construct the most general ChPT lagrangian for the weak
Vector-Pseudoscalar-Photon (VPgamma) vertex for K -> pi gamma gamma and K(L) ->
gamma gamma^* and consequently we get the full structure of the O(p^6) local
contributions generated by Vector Meson exchange. Then we compute new
factorizable contributions to the weak VPgamma vertex generated by the
odd-intrinsic parity violating lagrangian with no additional couplings. We find
in fact a very nice agreement with the phenomenology of K -> pi gamma gamma and
K(L) -> gamma gamma^*, more predictive power and a deeper understanding of the
O(p^6) local operators. A novel interpretation of the K(L) -> gamma gamma^*
data is given. Also a comparison with the existing models is presented.
| [
{
"created": "Fri, 4 Oct 1996 14:07:13 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 1997 15:28:41 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"D'Ambrosio",
"Giancarlo",
""
],
[
"Portoles",
"Jorge",
""
]
] | We have studied in the framework of Chiral Perturbation Theory (ChPT) the O(p^6) Vector Meson contributions to K -> pi gamma gamma and K(L) -> gamma gamma^*. We construct the most general ChPT lagrangian for the weak Vector-Pseudoscalar-Photon (VPgamma) vertex for K -> pi gamma gamma and K(L) -> gamma gamma^* and consequently we get the full structure of the O(p^6) local contributions generated by Vector Meson exchange. Then we compute new factorizable contributions to the weak VPgamma vertex generated by the odd-intrinsic parity violating lagrangian with no additional couplings. We find in fact a very nice agreement with the phenomenology of K -> pi gamma gamma and K(L) -> gamma gamma^*, more predictive power and a deeper understanding of the O(p^6) local operators. A novel interpretation of the K(L) -> gamma gamma^* data is given. Also a comparison with the existing models is presented. |
1710.10889 | Shao-Feng Ge | Shao-Feng Ge and Ian M. Shoemaker | Constraining Photon Portal Dark Matter with Texono and Coherent Data | 13 pages, 3 figures, extended study for both fermionic and scalar DM;
to appear in JHEP | null | 10.1007/JHEP11(2018)066 | IPMU17-0149 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter may reside in sector without Standard Model (SM) gauge
interactions. One way in which such a dark sector can still impact SM particles
through non-gravitational interactions is via the "photon portal" in which a
dark photon kinetically mixes with the ordinary SM photon. We study the
implications of this setup for electron recoil events at TEXONO reactor and
nuclear recoil events at the COHERENT experiment. We find that the recent
COHERENT data rules out previously allowed regions of parameter space favored
by the thermal relic hypothesis for the DM abundance. When mapped onto the
DM-electron cross section, we find that COHERENT provides the leading direct
constraints for DM masses < 30 MeV.
| [
{
"created": "Mon, 30 Oct 2017 11:59:01 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Nov 2017 14:34:55 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Mar 2018 12:56:18 GMT",
"version": "v3"
},
{
"created": "Thu, 8 Nov 2018 13:50:06 GMT",
"version": "v4"
}
] | 2018-12-05 | [
[
"Ge",
"Shao-Feng",
""
],
[
"Shoemaker",
"Ian M.",
""
]
] | Dark matter may reside in sector without Standard Model (SM) gauge interactions. One way in which such a dark sector can still impact SM particles through non-gravitational interactions is via the "photon portal" in which a dark photon kinetically mixes with the ordinary SM photon. We study the implications of this setup for electron recoil events at TEXONO reactor and nuclear recoil events at the COHERENT experiment. We find that the recent COHERENT data rules out previously allowed regions of parameter space favored by the thermal relic hypothesis for the DM abundance. When mapped onto the DM-electron cross section, we find that COHERENT provides the leading direct constraints for DM masses < 30 MeV. |
hep-ph/0204144 | D. V. Ahluwalia | D. V. Ahluwalia-Khalilova | Particle-Antiparticle Metamorphosis of Massive Majorana Neutrinos and
Gauginos | Updated authorship. No other changes | null | null | null | hep-ph hep-th nucl-th | null | Recent results on neutrinoless double beta decay, as reported by
Klapdor-Kleingrothaus et al., take us for the first time into the realm of
Majorana spacetime structure. However, this structure has either been treated
as an afterthought to the Dirac construct; or, when it has been attended to in
its own right, its physical and mathematical content was never fully unearthed.
In this Letter,we undertake to remedy the existing situation. We present a
detailed formalism required for the description of the non-trivial spacetime
structure underlying the "nu-nubar" metamorphosis - where "nu" generically
represents a massive Majorana neutrino, or a massive gaugino.
| [
{
"created": "Fri, 12 Apr 2002 21:04:56 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jun 2003 23:56:39 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ahluwalia-Khalilova",
"D. V.",
""
]
] | Recent results on neutrinoless double beta decay, as reported by Klapdor-Kleingrothaus et al., take us for the first time into the realm of Majorana spacetime structure. However, this structure has either been treated as an afterthought to the Dirac construct; or, when it has been attended to in its own right, its physical and mathematical content was never fully unearthed. In this Letter,we undertake to remedy the existing situation. We present a detailed formalism required for the description of the non-trivial spacetime structure underlying the "nu-nubar" metamorphosis - where "nu" generically represents a massive Majorana neutrino, or a massive gaugino. |
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