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/9312290 | Tatsuya Nakada | Tatsuya Nakada | Review on CP Violation | 35, PSI-PR-93-18 | AIP Conf.Proc.302:425-463,1994 | 10.1063/1.45461 | null | hep-ph | null | A phenomenological description of the neutral K and B meson systems is
presented. The situation of the current CP violation experiments is described
and a detailed discussion of their results is given, followed by some future
prospects.
| [
{
"created": "Wed, 15 Dec 1993 18:36:02 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Nakada",
"Tatsuya",
""
]
] | A phenomenological description of the neutral K and B meson systems is presented. The situation of the current CP violation experiments is described and a detailed discussion of their results is given, followed by some future prospects. |
2306.00912 | Theodore Brennan | T. Daniel Brennan and Sungwoo Hong | Introduction to Generalized Global Symmetries in QFT and Particle
Physics | 74 pages plus appendices | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Generalized symmetries (also known as categorical symmetries) is a newly
developing technique for studying quantum field theories. It has given us new
insights into the structure of QFT and many new powerful tools that can be
applied to the study of particle phenomenology. In these notes we give an
exposition to the topic of generalized/categorical symmetries for high energy
phenomenologists although the topics covered may be useful to the broader
physics community. Here we describe generalized symmetries without the use of
category theory and pay particular attention to the introduction of discrete
symmetries and their gauging.
| [
{
"created": "Thu, 1 Jun 2023 17:14:35 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2023 16:28:51 GMT",
"version": "v2"
}
] | 2023-06-06 | [
[
"Brennan",
"T. Daniel",
""
],
[
"Hong",
"Sungwoo",
""
]
] | Generalized symmetries (also known as categorical symmetries) is a newly developing technique for studying quantum field theories. It has given us new insights into the structure of QFT and many new powerful tools that can be applied to the study of particle phenomenology. In these notes we give an exposition to the topic of generalized/categorical symmetries for high energy phenomenologists although the topics covered may be useful to the broader physics community. Here we describe generalized symmetries without the use of category theory and pay particular attention to the introduction of discrete symmetries and their gauging. |
1609.07759 | Chandan Mondal | Chandan Mondal | Form factors and transverse charge and magnetization densities in the
hard-wall AdS/QCD model | 22 pages, 12 figures; version to appear in Phys. Rev. D | Phys. Rev. D 94, 073001 (2016) | 10.1103/PhysRevD.94.073001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of the flavor form factors in the framework of a hard-wall
AdS/QCD model and compare with the available experimental data. We obtain the
flavor form factors by decomposing the Dirac and Pauli form factors for the
nucleons using the charge and isospin symmetry. Further, we present a detailed
study of the flavor structures of the charge and anomalous magnetization
densities in the transverse plane. Both the unpolarized and the transversely
polarized nucleons are considered here. We compare the AdS/QCD results with two
standard phenomenological parametrizations.
| [
{
"created": "Sun, 25 Sep 2016 15:26:51 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Sep 2016 11:00:30 GMT",
"version": "v2"
}
] | 2016-10-25 | [
[
"Mondal",
"Chandan",
""
]
] | We present a study of the flavor form factors in the framework of a hard-wall AdS/QCD model and compare with the available experimental data. We obtain the flavor form factors by decomposing the Dirac and Pauli form factors for the nucleons using the charge and isospin symmetry. Further, we present a detailed study of the flavor structures of the charge and anomalous magnetization densities in the transverse plane. Both the unpolarized and the transversely polarized nucleons are considered here. We compare the AdS/QCD results with two standard phenomenological parametrizations. |
2302.03968 | Lingyun Dai | Shi-Qing Kuang, Qi Zhou, Di Guo, Qin-He Yang, and Ling-Yun Dai | Study of $X(6900)$ with unitarized coupled channel scattering amplitudes | 23 pages, 4 figures, add a few discussions | null | 10.1140/epjc/s10052-023-11473-3 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the resonant state $X(6900)$. The scattering
amplitudes of coupled channels, $J/\psi J/\psi$-$J/\psi \psi(2S)$-$J/\psi
\psi(3770)$, are constructed with the interaction of four vector mesons
described by effective Lagrangians. The amplitudes are calculated up to one
loop, decomposed by partial wave projection, and unitarized by Pad$\acute{e}$
approximation. These amplitudes are fitted to the latest experimental data sets
of di-$J/\psi$ and $J/\psi \psi(2S)$ invariant mass spectra of LHCb, CMS, and
ATLAS. High-quality solutions are obtained. With these partial wave amplitudes,
we extract the pole parameters of the $X(6900)$. Its quantum number is likely
to be $0^{++}$. According to the pole counting rule as well as analysis of the
phase shifts of the partial waves, it supports our previous conclusion that the
$X(6900)$ prefers to be a compact tetra-quark.
| [
{
"created": "Wed, 8 Feb 2023 09:53:19 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Mar 2023 09:32:40 GMT",
"version": "v2"
}
] | 2023-05-24 | [
[
"Kuang",
"Shi-Qing",
""
],
[
"Zhou",
"Qi",
""
],
[
"Guo",
"Di",
""
],
[
"Yang",
"Qin-He",
""
],
[
"Dai",
"Ling-Yun",
""
]
] | In this paper, we study the resonant state $X(6900)$. The scattering amplitudes of coupled channels, $J/\psi J/\psi$-$J/\psi \psi(2S)$-$J/\psi \psi(3770)$, are constructed with the interaction of four vector mesons described by effective Lagrangians. The amplitudes are calculated up to one loop, decomposed by partial wave projection, and unitarized by Pad$\acute{e}$ approximation. These amplitudes are fitted to the latest experimental data sets of di-$J/\psi$ and $J/\psi \psi(2S)$ invariant mass spectra of LHCb, CMS, and ATLAS. High-quality solutions are obtained. With these partial wave amplitudes, we extract the pole parameters of the $X(6900)$. Its quantum number is likely to be $0^{++}$. According to the pole counting rule as well as analysis of the phase shifts of the partial waves, it supports our previous conclusion that the $X(6900)$ prefers to be a compact tetra-quark. |
hep-ph/0207051 | Jan Kalinowski | Jan Kalinowski | Slepton Flavour Violation at Colliders | 8 pages, latex, 1 figure, a typo in Tab.1 fixed | Acta Phys.Polon. B33 (2002) 2613-2620 | null | null | hep-ph | null | In supersymmetric extensions of the Standard Model, the lepton flavour
violation (LFV) is closely related to the structure of slepton masses and
mixing. Allowing for the most general flavour structure of the slepton sector,
consistent with the experimental limits on rare lepton decays, large and
distinct signals of LFV at future colliders can be expected. A case study of
mixing of second and third generation of sleptons at an e+e- collider is
presented and compared to that of tau to mu+gamma rare decay.
| [
{
"created": "Wed, 3 Jul 2002 16:26:29 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jul 2002 07:32:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kalinowski",
"Jan",
""
]
] | In supersymmetric extensions of the Standard Model, the lepton flavour violation (LFV) is closely related to the structure of slepton masses and mixing. Allowing for the most general flavour structure of the slepton sector, consistent with the experimental limits on rare lepton decays, large and distinct signals of LFV at future colliders can be expected. A case study of mixing of second and third generation of sleptons at an e+e- collider is presented and compared to that of tau to mu+gamma rare decay. |
2011.03039 | Yu Jia | Feng Feng, Yingsheng Huang, Yu Jia, Wen-Long Sang, Jia-Yue Zhang | Exclusive radiative production of fully-charmed tetraquarks at $B$
Factory | 11 pages, 3 figures | null | 10.1016/j.physletb.2021.136368 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the newly developed NRQCD factorization formula to analyze the
exclusive production of the fully-charmed tetraquark $T_{4c}$ plus a hard
photon at $B$ factory. For simplicity, in this work we have concentrated on the
associated production of the $0^{++}$ and $2^{++}$ tetraquarks with a photon.
With some rough estimates about the size of the unknown nonperturbative NRQCD
matrix elements, we predict the production rates of these types of exclusive
channels at $\sqrt{s}=10.6$ GeV and also assess their observation prospect at
{\tt Belle 2} experiment.
| [
{
"created": "Thu, 5 Nov 2020 18:57:00 GMT",
"version": "v1"
}
] | 2021-05-19 | [
[
"Feng",
"Feng",
""
],
[
"Huang",
"Yingsheng",
""
],
[
"Jia",
"Yu",
""
],
[
"Sang",
"Wen-Long",
""
],
[
"Zhang",
"Jia-Yue",
""
]
] | We apply the newly developed NRQCD factorization formula to analyze the exclusive production of the fully-charmed tetraquark $T_{4c}$ plus a hard photon at $B$ factory. For simplicity, in this work we have concentrated on the associated production of the $0^{++}$ and $2^{++}$ tetraquarks with a photon. With some rough estimates about the size of the unknown nonperturbative NRQCD matrix elements, we predict the production rates of these types of exclusive channels at $\sqrt{s}=10.6$ GeV and also assess their observation prospect at {\tt Belle 2} experiment. |
1209.0040 | Andr\'e David | LHC Higgs Cross Section Working Group: A. David, A. Denner, M.
Duehrssen, M. Grazzini, C. Grojean, G. Passarino, M. Schumacher, M. Spira, G.
Weiglein, M. Zanetti | LHC HXSWG interim recommendations to explore the coupling structure of a
Higgs-like particle | null | null | null | LHCHXSWG-2012-001 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This document presents an interim framework in which the coupling structure
of a Higgs-like particle can be studied. After discussing different options and
approximations, recommendations on specific benchmark parametrizations to be
used to fit the data are given.
| [
{
"created": "Sat, 1 Sep 2012 00:47:56 GMT",
"version": "v1"
}
] | 2012-09-04 | [
[
"LHC Higgs Cross Section Working Group",
"",
""
],
[
"David",
"A.",
""
],
[
"Denner",
"A.",
""
],
[
"Duehrssen",
"M.",
""
],
[
"Grazzini",
"M.",
""
],
[
"Grojean",
"C.",
""
],
[
"Passarino",
"G.",
""
],
[
"Schumacher",
"M.",
""
],
[
"Spira",
"M.",
""
],
[
"Weiglein",
"G.",
""
],
[
"Zanetti",
"M.",
""
]
] | This document presents an interim framework in which the coupling structure of a Higgs-like particle can be studied. After discussing different options and approximations, recommendations on specific benchmark parametrizations to be used to fit the data are given. |
hep-ph/0307331 | Malgorzata Worek | K. Desch, A. Imhof, Z. Was and M. Worek | Probing the CP nature of the Higgs boson at linear colliders with tau
spin correlations; the case of mixed scalar--pseudoscalar couplings | 10 pages, 7 figures, LaTeX. Corrections of published version included | Phys.Lett. B579 (2004) 157-164 | 10.1016/j.physletb.2003.10.074 | CERN-TH-2003-166, LC-PHSM-2003-068 | hep-ph | null | The prospects for the measurement of the pseudoscalar admixture in the
h-tau-tau coupling to a Standard Model Higgs boson of 120 GeV mass are
discussed in a quantitative manner e+ e- collisions of 350 GeV centre-of-mass
energy. Specific angular distributions in the h --> tau tau; tau --> rho nu
decay chain can be used to probe mixing angles of scalar--pseudoscalar
h-tau-tau couplings. In the discussion of the feasibility of the method,
assumptions on the properties of a future detector for an e+ e- linear collider
such as TESLA are used. The Standard Model Higgsstrahlung production process is
taken as an example. For the expected performance of a typical Linear Collider
set-up, the sensitivity of a measurement of the scalar--pseudoscalar mixing
angle turned out to be 6 degree. It will be straightforward to apply our
results to estimate the sensitivity of a measurement, in cases another scenario
of the Higgs boson sector (Standard Model or not) is chosen by nature. The
experimental error of the method is expected to be limited by the statistics.
| [
{
"created": "Sat, 26 Jul 2003 20:25:05 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Feb 2004 19:40:41 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Desch",
"K.",
""
],
[
"Imhof",
"A.",
""
],
[
"Was",
"Z.",
""
],
[
"Worek",
"M.",
""
]
] | The prospects for the measurement of the pseudoscalar admixture in the h-tau-tau coupling to a Standard Model Higgs boson of 120 GeV mass are discussed in a quantitative manner e+ e- collisions of 350 GeV centre-of-mass energy. Specific angular distributions in the h --> tau tau; tau --> rho nu decay chain can be used to probe mixing angles of scalar--pseudoscalar h-tau-tau couplings. In the discussion of the feasibility of the method, assumptions on the properties of a future detector for an e+ e- linear collider such as TESLA are used. The Standard Model Higgsstrahlung production process is taken as an example. For the expected performance of a typical Linear Collider set-up, the sensitivity of a measurement of the scalar--pseudoscalar mixing angle turned out to be 6 degree. It will be straightforward to apply our results to estimate the sensitivity of a measurement, in cases another scenario of the Higgs boson sector (Standard Model or not) is chosen by nature. The experimental error of the method is expected to be limited by the statistics. |
2304.05921 | Hsiang-nan Li | Hsiang-nan Li | Dispersive determination of electroweak-scale masses | 9 pages, 4 figures, version to appear in Physical Review D | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the Higgs boson mass can be extracted from the dispersion
relation obeyed by the correlation function of two $b$-quark scalar currents.
The solution to the dispersion relation with the input from the perturbative
evaluation of the correlation function up to next-to-leading order in QCD and
with the $b$ quark mass $m_b=4.43$ GeV demands a specific Higgs mass 114 GeV.
Our observation offers an alternative resolution to the long-standing
fine-tuning problem of the Standard Model (SM): the Higgs mass is determined
dynamically for the internal consistency of the SM. The similar formalism, as
applied to the correlation function of two $b$-quark vector currents with the
same $m_b$, leads to the $Z$ boson mass 90.8 GeV. This solution exists only
when the $Z$ and $W$ boson masses are proportionate, conforming to the Higgs
mechanism of the electroweak symmetry breaking. We then consider the mixing
between the $Q\bar u$ and $\bar Qu$ states for a fictitious heavy quark $Q$ and
a $u$ quark through the $b\bar b$ channel, inspired by our earlier analysis of
neutral meson mixing. Its dispersion relation, given the perturbative input
from the responsible box diagrams and the same $m_b$, fixes the top quark mass
176 GeV. It is highly nontrivial to predict the above electroweak-scale masses
with at most 9\% deviation from their measured values using the single
parameter $m_b$. More accurate results are expected, as more precise
perturbative inputs are adopted.
| [
{
"created": "Wed, 12 Apr 2023 15:39:43 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2023 14:56:35 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Sep 2023 13:03:25 GMT",
"version": "v3"
}
] | 2023-09-08 | [
[
"Li",
"Hsiang-nan",
""
]
] | We demonstrate that the Higgs boson mass can be extracted from the dispersion relation obeyed by the correlation function of two $b$-quark scalar currents. The solution to the dispersion relation with the input from the perturbative evaluation of the correlation function up to next-to-leading order in QCD and with the $b$ quark mass $m_b=4.43$ GeV demands a specific Higgs mass 114 GeV. Our observation offers an alternative resolution to the long-standing fine-tuning problem of the Standard Model (SM): the Higgs mass is determined dynamically for the internal consistency of the SM. The similar formalism, as applied to the correlation function of two $b$-quark vector currents with the same $m_b$, leads to the $Z$ boson mass 90.8 GeV. This solution exists only when the $Z$ and $W$ boson masses are proportionate, conforming to the Higgs mechanism of the electroweak symmetry breaking. We then consider the mixing between the $Q\bar u$ and $\bar Qu$ states for a fictitious heavy quark $Q$ and a $u$ quark through the $b\bar b$ channel, inspired by our earlier analysis of neutral meson mixing. Its dispersion relation, given the perturbative input from the responsible box diagrams and the same $m_b$, fixes the top quark mass 176 GeV. It is highly nontrivial to predict the above electroweak-scale masses with at most 9\% deviation from their measured values using the single parameter $m_b$. More accurate results are expected, as more precise perturbative inputs are adopted. |
0908.0404 | Gino Isidori | Gino Isidori | Effective Theories for Flavour Physics beyond the Standard Model | Invited talk at International Workshop on Effective Field Theories:
From the Pion to the Upsilon (EFT 09), Valencia, Spain, 2-6 Feb 2009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the role of flavour physics in building effective theories at the
TeV scale. Particular attention is devoted to the Minimal Flavour Violation
hypothesis, both in the quark and in the lepton sector. Alternative
flavour-protection mechanisms, such as the hierarchical fermion profiles of
models with a warped fifth dimension, are also briefly discussed.
| [
{
"created": "Tue, 4 Aug 2009 08:10:16 GMT",
"version": "v1"
}
] | 2009-08-05 | [
[
"Isidori",
"Gino",
""
]
] | We discuss the role of flavour physics in building effective theories at the TeV scale. Particular attention is devoted to the Minimal Flavour Violation hypothesis, both in the quark and in the lepton sector. Alternative flavour-protection mechanisms, such as the hierarchical fermion profiles of models with a warped fifth dimension, are also briefly discussed. |
2010.11717 | Minxi He | Minxi He | Perturbative Reheating in the Mixed Higgs-$R^2$ Model | 20 pages plus appendices and references. Match published version | JCAP 05 (2021) 021 | 10.1088/1475-7516/2021/05/021 | RESCEU-20/20 | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The preheating process in the mixed Higgs-$ R^2 $ model has been investigated
in depth recently, but the analysis of perturbative reheating is still missing.
In this paper, we discuss the effect of perturbative decay during (p)reheating
in this model. It is shown that perturbative decay can play an important role
throughout the whole reheating process. Depending on the model parameters,
perturbative decay can affect different stages of the reheating. We study the
perturbative reheating with and without the presence of early preheating stage,
and calculate the reheating temperature and the duration of the whole
perturbative process. We find that the detail of the early preheating stage may
not affect the final reheating temperature while it can affect the number of
e-folds of reheating.
| [
{
"created": "Thu, 22 Oct 2020 13:44:19 GMT",
"version": "v1"
},
{
"created": "Mon, 10 May 2021 12:23:00 GMT",
"version": "v2"
}
] | 2021-06-14 | [
[
"He",
"Minxi",
""
]
] | The preheating process in the mixed Higgs-$ R^2 $ model has been investigated in depth recently, but the analysis of perturbative reheating is still missing. In this paper, we discuss the effect of perturbative decay during (p)reheating in this model. It is shown that perturbative decay can play an important role throughout the whole reheating process. Depending on the model parameters, perturbative decay can affect different stages of the reheating. We study the perturbative reheating with and without the presence of early preheating stage, and calculate the reheating temperature and the duration of the whole perturbative process. We find that the detail of the early preheating stage may not affect the final reheating temperature while it can affect the number of e-folds of reheating. |
hep-ph/0105008 | Antonio Pineda | Antonio Pineda | Determination of the bottom quark mass from the $\Upsilon(1S)$ system | 32 pages, LaTeX, 7 figures; Minor changes, journal version | JHEP0106:022,2001 | 10.1088/1126-6708/2001/06/022 | TTP01-12 | hep-ph hep-ex hep-lat | null | We approximately compute the normalization constant of the first infrared
renormalon of the pole mass (and the singlet static potential). Estimates of
higher order terms in the perturbative relation between the pole mass and the
$\MS$ mass (and in the relation between the singlet static potential and
$\alpha_s$) are given. We define a matching scheme (the renormalon subtracted
scheme) between QCD and any effective field theory with heavy quarks where,
besides the usual perturbative matching, the first renormalon in the Borel
plane of the pole mass is subtracted. A determination of the bottom $\MS$ quark
mass from the $\Upsilon(1S)$ system is performed with this new scheme and the
errors studied. Our result reads $m_{b,\MS}(m_{b,\MS})=4 210^{+90}_{-90}({\rm
theory})^{-25}_{+25}(\alpha_s)$ MeV. Using the mass difference between the $B$
and $D$ meson, we also obtain a value for the charm quark mass:
$m_{c,\MS}(m_{c,\MS})=1 210^{+70}_{-70}({\rm
theory})^{+65}_{-65}(m_{b,\MS})^{-45}_{+45}(\lambda_1)$ MeV. We finally discuss
upon eventual improvements of these determinations.
| [
{
"created": "Tue, 1 May 2001 20:13:48 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2001 15:26:01 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Pineda",
"Antonio",
""
]
] | We approximately compute the normalization constant of the first infrared renormalon of the pole mass (and the singlet static potential). Estimates of higher order terms in the perturbative relation between the pole mass and the $\MS$ mass (and in the relation between the singlet static potential and $\alpha_s$) are given. We define a matching scheme (the renormalon subtracted scheme) between QCD and any effective field theory with heavy quarks where, besides the usual perturbative matching, the first renormalon in the Borel plane of the pole mass is subtracted. A determination of the bottom $\MS$ quark mass from the $\Upsilon(1S)$ system is performed with this new scheme and the errors studied. Our result reads $m_{b,\MS}(m_{b,\MS})=4 210^{+90}_{-90}({\rm theory})^{-25}_{+25}(\alpha_s)$ MeV. Using the mass difference between the $B$ and $D$ meson, we also obtain a value for the charm quark mass: $m_{c,\MS}(m_{c,\MS})=1 210^{+70}_{-70}({\rm theory})^{+65}_{-65}(m_{b,\MS})^{-45}_{+45}(\lambda_1)$ MeV. We finally discuss upon eventual improvements of these determinations. |
2302.01765 | Joan Soto | Joan Soto and Sandra Tom\`as Valls | Hyperfine splittings of heavy quarkonium hybrids | 10 pages, 3 figures, 5 tables, matches journal version | null | 10.1103/PhysRevD.108.014025 | null | hep-ph hep-lat | http://creativecommons.org/licenses/by/4.0/ | In the framework of the Born-Oppenheimer Effective Field Theory, the
hyperfine structure of heavy quarkonium hybrids at leading order in the 1/m Q
expansion is determined by two potentials. We estimate those potentials by
interpolating between the known short distance behavior and the long distance
behavior calculated in the QCD Effective String Theory. The long distance
behavior depends, at leading order, on two parameters which can be obtained
from the long distance behavior of the heavy quarkonium potentials (up to sign
ambiguities). The short distance behavior depends, at leading order, on two
extra paramentes, which are obtained from a lattice calculation of the lower
lying charmonium hybrid multiplets. This allows us to predict the hyperfine
splitting both of bottomonium hybrids and of higher multiplets of charmonium
hybrids. We carry out a careful error analysis and compare with other
approaches.
| [
{
"created": "Fri, 3 Feb 2023 14:25:27 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Sep 2023 11:06:57 GMT",
"version": "v2"
}
] | 2023-09-04 | [
[
"Soto",
"Joan",
""
],
[
"Valls",
"Sandra Tomàs",
""
]
] | In the framework of the Born-Oppenheimer Effective Field Theory, the hyperfine structure of heavy quarkonium hybrids at leading order in the 1/m Q expansion is determined by two potentials. We estimate those potentials by interpolating between the known short distance behavior and the long distance behavior calculated in the QCD Effective String Theory. The long distance behavior depends, at leading order, on two parameters which can be obtained from the long distance behavior of the heavy quarkonium potentials (up to sign ambiguities). The short distance behavior depends, at leading order, on two extra paramentes, which are obtained from a lattice calculation of the lower lying charmonium hybrid multiplets. This allows us to predict the hyperfine splitting both of bottomonium hybrids and of higher multiplets of charmonium hybrids. We carry out a careful error analysis and compare with other approaches. |
1606.02504 | Sampsa Vihonen | C.R. Das, Jukka Maalampi, Joao Pulido and Sampsa Vihonen | Optimizing the $\theta_{23}$ octant search in long baseline neutrino
experiments | 16 pages, 4 figures | null | 10.1088/1742-6596/888/1/012219 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of determining the octant of the neutrino mixing
angle $\theta_{23}$, that is, whether $\theta_{23}> 45^\circ$ or
$\theta_{23}<45^\circ$, in long baseline neutrino experiments. Here we
numerically derived the sensitivity limits within which these experiments can
determine, by measuring the probability of the $\nu_{\mu}\to \nu_{e}$
transitions, the octant of $\theta_{23}$ with a $5\sigma$ certainty. The
interference of the CP violation angle $\delta$ with these limits, as well as
the effects of the baseline length and the run-time ratio of neutrino and
antineutrino modes of the beam have been analyzed.
| [
{
"created": "Wed, 8 Jun 2016 10:54:54 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2016 09:37:57 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Dec 2018 14:30:22 GMT",
"version": "v3"
}
] | 2018-12-18 | [
[
"Das",
"C. R.",
""
],
[
"Maalampi",
"Jukka",
""
],
[
"Pulido",
"Joao",
""
],
[
"Vihonen",
"Sampsa",
""
]
] | We study the possibility of determining the octant of the neutrino mixing angle $\theta_{23}$, that is, whether $\theta_{23}> 45^\circ$ or $\theta_{23}<45^\circ$, in long baseline neutrino experiments. Here we numerically derived the sensitivity limits within which these experiments can determine, by measuring the probability of the $\nu_{\mu}\to \nu_{e}$ transitions, the octant of $\theta_{23}$ with a $5\sigma$ certainty. The interference of the CP violation angle $\delta$ with these limits, as well as the effects of the baseline length and the run-time ratio of neutrino and antineutrino modes of the beam have been analyzed. |
2202.04336 | Rishabh Jain | Wei-shu Hou, Rishabh Jain and Chung Kao | Searching for extra Higgs bosons via $pp\to H,A\to \tau\mu, \tau\tau $
at the Large Hadron Collider | 20 pages, 11 figures, Version to appear in the European Physical
Journal C | null | null | OU-HEP-220208 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We extend heavy Higgs searches at the Large Hadron Collider for $H \to \tau
\mu$ by CMS, and $H \to \tau\tau$ by ATLAS and CMS, to study discovery
prospects of extra Higgs states in $pp \to H,A \to \tau \mu, \tau\tau$ with
$e\mu + E_T$ and $j_{\tau} \mu + E_T$ final states, where $j_{\tau} = \pi \, ,
\rho\, , a_1$ and $E_T$ is missing transverse energy. In a general two Higgs
doublet model without $Z_2$ symmetry, extra Yukawa couplings $\rho_{\tau\tau}$
and $\rho_{\tau\mu}$ can drive $H,A \to \tau\tau$ and $\tau\mu$ channels at
hadron colliders, following gluon-gluon fusion production with extra
$\rho_{tt}$ couplings. The light Higgs boson $h(125)$ is found to resemble
closely the Standard Model Higgs boson; in the alignment limit of $\cos\gamma
\to 0$ for $h$--$H$ mixing, flavor changing neutral Higgs couplings such as $h
\to \tau\mu$ are naturally suppressed, but the couplings of the heavier $H$ is
optimized by $\sin \gamma \to 1$. We define various signal regions for $H,A \to
\tau\mu$ and $\tau \tau$ and evaluate physics backgrounds from dominant
processes with realistic acceptance cuts and tagging efficiencies. Two
different studies are presented. We first perform a parton level study without
any hadronization and with minimal detector smearing. We then include
hadronization using PYTHIA 8.2 and fast detector simulation using DELPHES to
give event level simulation. Results for $\sqrt{s}= 13$ TeV appear promising,
which we extend further to $\sqrt{s} = 14$ TeV for the High Luminosity LHC.
| [
{
"created": "Wed, 9 Feb 2022 08:45:36 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2023 09:36:18 GMT",
"version": "v2"
}
] | 2023-11-23 | [
[
"Hou",
"Wei-shu",
""
],
[
"Jain",
"Rishabh",
""
],
[
"Kao",
"Chung",
""
]
] | We extend heavy Higgs searches at the Large Hadron Collider for $H \to \tau \mu$ by CMS, and $H \to \tau\tau$ by ATLAS and CMS, to study discovery prospects of extra Higgs states in $pp \to H,A \to \tau \mu, \tau\tau$ with $e\mu + E_T$ and $j_{\tau} \mu + E_T$ final states, where $j_{\tau} = \pi \, , \rho\, , a_1$ and $E_T$ is missing transverse energy. In a general two Higgs doublet model without $Z_2$ symmetry, extra Yukawa couplings $\rho_{\tau\tau}$ and $\rho_{\tau\mu}$ can drive $H,A \to \tau\tau$ and $\tau\mu$ channels at hadron colliders, following gluon-gluon fusion production with extra $\rho_{tt}$ couplings. The light Higgs boson $h(125)$ is found to resemble closely the Standard Model Higgs boson; in the alignment limit of $\cos\gamma \to 0$ for $h$--$H$ mixing, flavor changing neutral Higgs couplings such as $h \to \tau\mu$ are naturally suppressed, but the couplings of the heavier $H$ is optimized by $\sin \gamma \to 1$. We define various signal regions for $H,A \to \tau\mu$ and $\tau \tau$ and evaluate physics backgrounds from dominant processes with realistic acceptance cuts and tagging efficiencies. Two different studies are presented. We first perform a parton level study without any hadronization and with minimal detector smearing. We then include hadronization using PYTHIA 8.2 and fast detector simulation using DELPHES to give event level simulation. Results for $\sqrt{s}= 13$ TeV appear promising, which we extend further to $\sqrt{s} = 14$ TeV for the High Luminosity LHC. |
2210.06215 | HongWei Ke | Hong-Wei Ke, Yi-Fan Shi, Xiao-Hai Liu and Xue-Qian Li | Possible molecular states of $\bar D^{*}K^{*}$ ($ D^{*}K^{*}$) and the
new exotic states $X_0(2900)$ and $X_1(2900)$ ($T^a_{cs0}(2900)^0$ and
$T^a_{cs0}(2900)^{++}$) | 14 pages, 2 figures and 5 tables. Accepted by PRD. arXiv admin note:
text overlap with arXiv:2112.14142 | Physical Review D 106, 114032 (2022) | 10.1103/PhysRevD.106.114032 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Two iso-singlet hadron states $X_0(2900)$ and $X_1(2900)$ with $J=0$ and 1
respectively, discovered by the LHCb collaboration in 2020, were identified as
molecular bound states of $\bar D^*K^*$. Recently two structures
$T^a_{cs0}(2900)^0$ and $T^a_{cs0}(2900)^{++}$ have been observed at the hadron
spectra, one would suspect if they also are molecular states of $D^*$ and
$K^*$. As long as they were of the molecular structures of $D^*K^*$, the hadron
states must be in an iso-vector, namely $T^a_{cs0}(2900)^0$ and
$T^a_{cs0}(2900)^{++}$ were $I_3=-1, 1$ components of the iso-vector. If it is
the case, the corresponding $T^a_{cs0}(2900)^+$ of ($I=1,I_3=0$) and
$T^{'a}_{cs0}(2900)^{+}$ of $I=0,I_3=0$ so far evade experimental observation,
but should be found by the future experiments. To testify this ansatz, in this
paper we study the possible molecular structures of $\bar D^{*}K^{*}$ and
$D^{*}K^{*}$ within the Bethe-Salpeter (B-S) framework. With reasonable input
parameters it is found that $\bar D^{*}K^{*}$ iso-scalar systems with $J^P=0^+$
and $1^+$ are solutions. The result supports the ansatz of $X_0(2900)$
($X_1(2900)$) being molecular states of $\bar D^*K^{*}$. Whereas for the system
of $ D^{*}K^{*}$ with $I=1$ the corresponding B-S equation has no solution.
Thus we can draw a clear conclusion that $T^a_{cs0}(2900)^0$ and
$T^a_{cs0}(2900)^{++}$ should not be bound states of $ D^{*}$ and $K^{*}$. The
two structures observed by the LHCb collaboration may be caused by dynamics,
such as the well-recognized triangle anomalies or other mechanisms.
| [
{
"created": "Wed, 12 Oct 2022 14:01:27 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2022 12:02:25 GMT",
"version": "v2"
}
] | 2023-01-02 | [
[
"Ke",
"Hong-Wei",
""
],
[
"Shi",
"Yi-Fan",
""
],
[
"Liu",
"Xiao-Hai",
""
],
[
"Li",
"Xue-Qian",
""
]
] | Two iso-singlet hadron states $X_0(2900)$ and $X_1(2900)$ with $J=0$ and 1 respectively, discovered by the LHCb collaboration in 2020, were identified as molecular bound states of $\bar D^*K^*$. Recently two structures $T^a_{cs0}(2900)^0$ and $T^a_{cs0}(2900)^{++}$ have been observed at the hadron spectra, one would suspect if they also are molecular states of $D^*$ and $K^*$. As long as they were of the molecular structures of $D^*K^*$, the hadron states must be in an iso-vector, namely $T^a_{cs0}(2900)^0$ and $T^a_{cs0}(2900)^{++}$ were $I_3=-1, 1$ components of the iso-vector. If it is the case, the corresponding $T^a_{cs0}(2900)^+$ of ($I=1,I_3=0$) and $T^{'a}_{cs0}(2900)^{+}$ of $I=0,I_3=0$ so far evade experimental observation, but should be found by the future experiments. To testify this ansatz, in this paper we study the possible molecular structures of $\bar D^{*}K^{*}$ and $D^{*}K^{*}$ within the Bethe-Salpeter (B-S) framework. With reasonable input parameters it is found that $\bar D^{*}K^{*}$ iso-scalar systems with $J^P=0^+$ and $1^+$ are solutions. The result supports the ansatz of $X_0(2900)$ ($X_1(2900)$) being molecular states of $\bar D^*K^{*}$. Whereas for the system of $ D^{*}K^{*}$ with $I=1$ the corresponding B-S equation has no solution. Thus we can draw a clear conclusion that $T^a_{cs0}(2900)^0$ and $T^a_{cs0}(2900)^{++}$ should not be bound states of $ D^{*}$ and $K^{*}$. The two structures observed by the LHCb collaboration may be caused by dynamics, such as the well-recognized triangle anomalies or other mechanisms. |
1207.0462 | Gavin Salam | Gavin P. Salam | QCD in hadron collisions | 9 pages, 4 figures, contribution to the proceedings of La Thuile
2012, the XXVI Rencontres de Physique de la Vall\'ee d'Aoste | null | 10.1393/ncc/i2012-11362-x | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | This talk examines recent progress in collider QCD and some facets of the
interplay between these developments and searches for new particles and
phenomena at the Tevatron and LHC.
| [
{
"created": "Mon, 2 Jul 2012 18:24:41 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Salam",
"Gavin P.",
""
]
] | This talk examines recent progress in collider QCD and some facets of the interplay between these developments and searches for new particles and phenomena at the Tevatron and LHC. |
1805.07342 | Kunio Kaneta | Emilian Dudas, Tony Gherghetta, Kunio Kaneta, Yann Mambrini, Keith A.
Olive | Gravitino Decay in High Scale Supersymmetry with R-parity Violation | 27 pages, 4 figures | Phys. Rev. D 98, 015030 (2018) | 10.1103/PhysRevD.98.015030 | CPHT-RR034.052018, UMN--TH--3718/18, FTPI--MINN--18/08,
LPT-Orsay-18-62 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the effects of R-parity violation due to the inclusion of a
bilinear $\mu^\prime L H_u$ superpotential term in high scale supersymmetric
models with an EeV scale gravitino as dark matter. Although the typical
phenomenological limits on this coupling (e.g. due to lepton number violation
and the preservation of the baryon asymmetry) are relaxed when the
supersymmetric mass spectrum is assumed to be heavy (in excess of the
inflationary scale of $3 \times 10^{13}$ GeV), the requirement that the
gravitino be sufficiently long-lived so as to account for the observed dark
matter density, leads to a relatively strong bound on $\mu^\prime \lesssim 20$
GeV. The dominant decay channels for the longitudinal component of the
gravitino are $Z \nu, W^\pm l^\mp$, and $h\nu$. To avoid an excess neutrino
signal in IceCube, our limit on $\mu'$ is then strengthened to $\mu' \lesssim
50$ keV. When the bound is saturated, we find that there is a potentially
detectable flux of mono-chromatic neutrinos with EeV energies.
| [
{
"created": "Fri, 18 May 2018 17:50:23 GMT",
"version": "v1"
}
] | 2018-08-01 | [
[
"Dudas",
"Emilian",
""
],
[
"Gherghetta",
"Tony",
""
],
[
"Kaneta",
"Kunio",
""
],
[
"Mambrini",
"Yann",
""
],
[
"Olive",
"Keith A.",
""
]
] | We consider the effects of R-parity violation due to the inclusion of a bilinear $\mu^\prime L H_u$ superpotential term in high scale supersymmetric models with an EeV scale gravitino as dark matter. Although the typical phenomenological limits on this coupling (e.g. due to lepton number violation and the preservation of the baryon asymmetry) are relaxed when the supersymmetric mass spectrum is assumed to be heavy (in excess of the inflationary scale of $3 \times 10^{13}$ GeV), the requirement that the gravitino be sufficiently long-lived so as to account for the observed dark matter density, leads to a relatively strong bound on $\mu^\prime \lesssim 20$ GeV. The dominant decay channels for the longitudinal component of the gravitino are $Z \nu, W^\pm l^\mp$, and $h\nu$. To avoid an excess neutrino signal in IceCube, our limit on $\mu'$ is then strengthened to $\mu' \lesssim 50$ keV. When the bound is saturated, we find that there is a potentially detectable flux of mono-chromatic neutrinos with EeV energies. |
hep-ph/9702317 | Roman Nevzorov | J.M.Frere (Universite Libre de Bruxelles), R.B.Nevzorov, V.A.Novikov,
M.I.Vysotsky (ITEP, Moscow) | Neutrino Magnetic Moment Behaviour in a Renormalizable Model | 9 pages, 2 Postscript figures | Phys.Atom.Nucl. 60 (1997) 1662-1665; Yad.Fiz. 60N10 (1997)
1820-1823 | null | ITEP-9-97 | hep-ph | null | We have shown in hep-ph/9608266 that a neutrino magnetic moment form factor
$\mu_{\nu} (q^2)$ could be considerably amplified at low momentum transfer,$q^2
\leq m_N^2$, at the cost of introducing an extra light neutral fermion $N$ with
mass $m_N$ and nonzero magnetic moment. It was assumed that the magnetic moment
of $N$ would originate in a renormalizable way at a heavy scale $M$. While the
enhancement of the neutrino magnetic moment was unambiguous, we stressed that
in this effective Lagrangian approach an uncertainty persisted about the
behaviour of $\mu_{\nu} (q^2)$ in the interval $m_N^2 \ll q^2 \ll M^2$. This is
not unexpected in presence of a nonrenormalizable effective theory (a particle
with bare magnetic moment). We show in a simple renormalizable model for the
magnetic moment of particle $N$ how a 2 loop calculation solves the ambiguity.
In the domain $m_N^2 \ll q^2 \ll M^2$ we confirm the result obtained in
hep-ph/9608266 using a sharp cut-off. It is amusing that the correct results
are given, as expected, through dimensional regularization in the full theory,
but not in the effective lagrangian approach.
| [
{
"created": "Wed, 12 Feb 1997 19:15:54 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Frere",
"J. M.",
"",
"Universite Libre de Bruxelles"
],
[
"Nevzorov",
"R. B.",
"",
"ITEP, Moscow"
],
[
"Novikov",
"V. A.",
"",
"ITEP, Moscow"
],
[
"Vysotsky",
"M. I.",
"",
"ITEP, Moscow"
]
] | We have shown in hep-ph/9608266 that a neutrino magnetic moment form factor $\mu_{\nu} (q^2)$ could be considerably amplified at low momentum transfer,$q^2 \leq m_N^2$, at the cost of introducing an extra light neutral fermion $N$ with mass $m_N$ and nonzero magnetic moment. It was assumed that the magnetic moment of $N$ would originate in a renormalizable way at a heavy scale $M$. While the enhancement of the neutrino magnetic moment was unambiguous, we stressed that in this effective Lagrangian approach an uncertainty persisted about the behaviour of $\mu_{\nu} (q^2)$ in the interval $m_N^2 \ll q^2 \ll M^2$. This is not unexpected in presence of a nonrenormalizable effective theory (a particle with bare magnetic moment). We show in a simple renormalizable model for the magnetic moment of particle $N$ how a 2 loop calculation solves the ambiguity. In the domain $m_N^2 \ll q^2 \ll M^2$ we confirm the result obtained in hep-ph/9608266 using a sharp cut-off. It is amusing that the correct results are given, as expected, through dimensional regularization in the full theory, but not in the effective lagrangian approach. |
hep-ph/0310194 | Konstantinos Dimopoulos | K. Dimopoulos and M. Axenides | Hybrid Inflation without Flat Directions and without Primordial Black
Holes | 20 pages, LaTeX, 4 figures, added material and references, version
submitted to journal | JCAP 0506:008,2005 | 10.1088/1475-7516/2005/06/008 | null | hep-ph astro-ph gr-qc hep-th | null | We investigate the possibility that the Universe may inflate due to moduli
fields, corresponding to flat directions of supersymmetry, lifted by
supergravity corrections. Using a hybrid-type potential we obtain a two-stage
inflationary model. Depending on the curvature of the potential the first stage
corresponds to a period of fast-roll inflation or a period of `locked'
inflation, induced by an oscillating inflaton. This is followed by a second
stage of fast-roll inflation. We demonstrate that these two consecutive
inflationary phases result in enough total e-foldings to encompass the
cosmological scales. Using natural values for the parameters (masses of order
TeV and vacuum energy of the intermediate scale corresponding to gravity
mediated supersymmetry breaking) we conclude that the $\eta$-problem of
inflation is easily overcome. The greatest obstacle to our scenario is the
possibility of copious production of cosmologically disastrous primordial black
holes due to the phase transition switching from the first into the second
stage of inflation. We study this problem in detail and show analytically that
there is ample parameter space where these black holes do not form at all. To
generate structure in the Universe we assume the presence of a curvaton field.
Finally we also discuss the moduli problem and how it affects our
considerations.
| [
{
"created": "Thu, 16 Oct 2003 15:37:06 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2003 16:15:43 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Sep 2004 17:03:22 GMT",
"version": "v3"
}
] | 2011-01-20 | [
[
"Dimopoulos",
"K.",
""
],
[
"Axenides",
"M.",
""
]
] | We investigate the possibility that the Universe may inflate due to moduli fields, corresponding to flat directions of supersymmetry, lifted by supergravity corrections. Using a hybrid-type potential we obtain a two-stage inflationary model. Depending on the curvature of the potential the first stage corresponds to a period of fast-roll inflation or a period of `locked' inflation, induced by an oscillating inflaton. This is followed by a second stage of fast-roll inflation. We demonstrate that these two consecutive inflationary phases result in enough total e-foldings to encompass the cosmological scales. Using natural values for the parameters (masses of order TeV and vacuum energy of the intermediate scale corresponding to gravity mediated supersymmetry breaking) we conclude that the $\eta$-problem of inflation is easily overcome. The greatest obstacle to our scenario is the possibility of copious production of cosmologically disastrous primordial black holes due to the phase transition switching from the first into the second stage of inflation. We study this problem in detail and show analytically that there is ample parameter space where these black holes do not form at all. To generate structure in the Universe we assume the presence of a curvaton field. Finally we also discuss the moduli problem and how it affects our considerations. |
hep-ph/0404063 | Pawel Jankowski | F.Cornet (Granada U.), P.Jankowski (Warsaw U.) and M.Krawczyk (Warsaw
U.) | A New 5 Flavour NLO Analysis and Parametrizations of Parton
Distributions of the Real Photon | 49 pages, 27 postscript figures; FORTRAN programs available at
http://www.fuw.edu.pl/~pjank/param.html | Phys.Rev.D70:093004,2004 | 10.1103/PhysRevD.70.093004 | null | hep-ph | null | New, radiatively generated, NLO quark (u,d,s,c,b) and gluon densities in a
real, unpolarized photon are presented. We perform three global fits, based on
the NLO DGLAP evolution equations for Q^2>1 GeV^2, to all the available
structure function F_2^gamma(x,Q^2) data. As in our previous LO analysis we
utilize two theoretical approaches. Two models, denoted as FFNS_{CJK}1 & 2 NLO,
adopt the so-called Fixed Flavour-Number Scheme for calculation of the
heavy-quark contributions to F_2^gamma(x,Q^2), the CJK NLO model applies the
ACOT(chi) scheme. We examine the results of our fits by a comparison with the
LEP data for the Q^2 dependence of the F_2^gamma, averaged over various
x-regions, and the F_2,c^gamma. Grid parametrizations of the parton densities
for all fits are provided.
| [
{
"created": "Wed, 7 Apr 2004 16:54:09 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Cornet",
"F.",
"",
"Granada U."
],
[
"Jankowski",
"P.",
"",
"Warsaw U."
],
[
"Krawczyk",
"M.",
"",
"Warsaw\n U."
]
] | New, radiatively generated, NLO quark (u,d,s,c,b) and gluon densities in a real, unpolarized photon are presented. We perform three global fits, based on the NLO DGLAP evolution equations for Q^2>1 GeV^2, to all the available structure function F_2^gamma(x,Q^2) data. As in our previous LO analysis we utilize two theoretical approaches. Two models, denoted as FFNS_{CJK}1 & 2 NLO, adopt the so-called Fixed Flavour-Number Scheme for calculation of the heavy-quark contributions to F_2^gamma(x,Q^2), the CJK NLO model applies the ACOT(chi) scheme. We examine the results of our fits by a comparison with the LEP data for the Q^2 dependence of the F_2^gamma, averaged over various x-regions, and the F_2,c^gamma. Grid parametrizations of the parton densities for all fits are provided. |
1905.00253 | Hamza Taibi | Hamza Taibi and Nourredine Mebarki | Constraints on electroweak gauged unparticle model from the oblique
parameters S and T | 5 pages, 4 figures | null | 10.1142/S0217732320502417 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The oblique parameters $S$ and $T$ are calculated in a gauged unparticles
model based on the electroweak group $SU(2)*U(1)$ and it's parameters space is
constrained using electroweak precision measurements.
| [
{
"created": "Wed, 1 May 2019 10:47:21 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Taibi",
"Hamza",
""
],
[
"Mebarki",
"Nourredine",
""
]
] | The oblique parameters $S$ and $T$ are calculated in a gauged unparticles model based on the electroweak group $SU(2)*U(1)$ and it's parameters space is constrained using electroweak precision measurements. |
hep-ph/9412209 | Stefano Moretti | S. Moretti and W.J. Stirling | Contributions of below--threshold decays to ${\cal {MSSM}}$ Higgs
branching ratios | 15 pages, latex, 5 figures appended as uuencoded files | Phys.Lett. B347 (1995) 291-299; Erratum-ibid. B366 (1996) 451 | 10.1016/0370-2693(95)00088-3 | DFTT 60/94, DTP/94/104 | hep-ph | null | We calculate all the experimentally relevant branching ratios of the Higgs
bosons of the Minimal Supersymmetric Standard Model, paying particular
attention to the contributions from below--threshold decays. We show that in
some cases these can significantly change the pattern of branching ratios
calculated without taking off--shell effects into account
| [
{
"created": "Thu, 1 Dec 1994 22:53:41 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Moretti",
"S.",
""
],
[
"Stirling",
"W. J.",
""
]
] | We calculate all the experimentally relevant branching ratios of the Higgs bosons of the Minimal Supersymmetric Standard Model, paying particular attention to the contributions from below--threshold decays. We show that in some cases these can significantly change the pattern of branching ratios calculated without taking off--shell effects into account |
0807.0020 | Gregory Soyez | Gregory Soyez | The dipole picture in DIS: saturation and heavy quarks | 4 pages, presented at the 16th workshop on Deep Inelastic Scattering,
7-11 April 2008, UCL, London, UK | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the description of the proton structure function within the dipole
factorisation framework. We parametrise the forward dipole amplitude to account
for saturation as predicted by the small-x QCD evolution equations. Contrarily
to previous models, the saturation scale does not decrease when taking heavy
quarks into account. We show that the same dipole amplitude also allows to
reproduce diffractive data and exclusive vector meson production.
| [
{
"created": "Mon, 30 Jun 2008 21:14:13 GMT",
"version": "v1"
}
] | 2008-07-02 | [
[
"Soyez",
"Gregory",
""
]
] | We discuss the description of the proton structure function within the dipole factorisation framework. We parametrise the forward dipole amplitude to account for saturation as predicted by the small-x QCD evolution equations. Contrarily to previous models, the saturation scale does not decrease when taking heavy quarks into account. We show that the same dipole amplitude also allows to reproduce diffractive data and exclusive vector meson production. |
hep-ph/0203274 | Jun Tabei | J. Tabei and H. Hotta | Constraints on $\tan{\beta}$ in SUSY SU(5) GUT | 21 pages, 12 figures, 2 tabels | null | null | null | hep-ph | null | On the evaluation of $\tan{\beta}$ is revisited by the method of the
renormalization group with the criteria of the bottom-tau unification in the
SUSY SU(5) GUT model. Among the conventional supersymmetric theories, an
energy-scale constant $M_{SUSY}$ is introduced by-hand to decouple the lower
energy-scale region from the effects of the supersymmetric particles. Provided
that $M_{SUSY}$ really exists, only small $\tan{\beta} \simeq 2$ is allowed
theoretically. While, medium value as $\tan{\beta} = 6 \sim 25$ is also
supported if $M_{SUSY}$ is vanished away from the model.
| [
{
"created": "Fri, 29 Mar 2002 14:32:08 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2002 11:09:46 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Tabei",
"J.",
""
],
[
"Hotta",
"H.",
""
]
] | On the evaluation of $\tan{\beta}$ is revisited by the method of the renormalization group with the criteria of the bottom-tau unification in the SUSY SU(5) GUT model. Among the conventional supersymmetric theories, an energy-scale constant $M_{SUSY}$ is introduced by-hand to decouple the lower energy-scale region from the effects of the supersymmetric particles. Provided that $M_{SUSY}$ really exists, only small $\tan{\beta} \simeq 2$ is allowed theoretically. While, medium value as $\tan{\beta} = 6 \sim 25$ is also supported if $M_{SUSY}$ is vanished away from the model. |
hep-ph/0503261 | David Hitlin | JoAnne. L. Hewett, David G. Hitlin (eds), T. Abe, K. Agashe, J.
Albert, A. Ali, D. Atwood, C. Bauer, C. Bernard, I. Bigi,, A.J. Buras, G.
Burdman, M. Ciuchini, M. Convery, S. Dasu, A. Datta, M. Datta, A. Dedes, D.
del Re, D.A. Demir, F. Di Lodovico, D. Dujmic, G. Eigen, U. Egede, A. Falk,
Th. Feldmann, S. Gopalakrishna, T. Goto, K. Graziani, B. Grinstein, A.
Gritsan, M. Gronau, Y. Grossman, S. Hashimoto, M. Hazumi, J. Hewett, G.
Hiller, J. Hisano, D.G. Hitlin, W. Hulsbergen, T. Hurth, O. Igonkina, G.
Isidori, C. Jessop, A.L. Kagan, P. Ko, C. Kolda, P. Koppenburg, V. Koptchev,
F. Krueger, U. Langenegger, J. Libby, Z. Ligeti, B. Lillie, D. London, M.
Luke, E. Lunghi, P. Mackenzie, A. Manohar, K. Matchev, T.Moore, M. Neubert,
S. Oh, Y. Okada, Y. Parkhomenko, A.A. Petrov, D. Pirjol, A. Poschenrieder, M.
Purohit, H. Quinn, T.G. Rizzo, S.H. Robertson, A. Roodman, J. Rosner, I.
Rothstein, A. Rubin, A. Ryd, V.G. Shelkov, Y. Shimizu, T. Shindou, L.
Silvestrini, N. Sinha, R. Sinha, A. Soffer, A. Soni, M. Spranger, H.
Staengle, I. Stewart, M. Tanaka, S.K. Vempati, O. Vives, M. Voloshin, A.
Weiler, J.D. Wells, G. Wilkinson, D.C. Williams, S. Willocq, D. Wyler, J.
Zupan | The Discovery Potential of a Super B Factory | 476 pages. Printed copies may be obtained by request to
kwebb@slac.stanford.edu . arXiv admin note: v2 appears to be identical to v1 | null | null | SLAC-R-709 | hep-ph | null | The Proceedings of the 2003 SLAC Workshops on flavor physics with a high
luminosity asymmetric e+e- collider. The sensitivity of flavor physics to
physics beyond the Standard Model is addressed in detail, in the context of the
improvement of experimental measurements and theoretical calculations.
| [
{
"created": "Fri, 25 Mar 2005 13:28:30 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2005 17:28:31 GMT",
"version": "v2"
}
] | 2012-04-15 | [
[
"Hewett",
"JoAnne. L.",
"",
"eds"
],
[
"Hitlin",
"David G.",
"",
"eds"
],
[
"Abe",
"T.",
""
],
[
"Agashe",
"K.",
""
],
[
"Albert",
"J.",
""
],
[
"Ali",
"A.",
""
],
[
"Atwood",
"D.",
""
],
[
"Bauer",
"C.",
""
],
[
"Bernard",
"C.",
""
],
[
"Bigi",
"I.",
""
],
[
"Buras",
"A. J.",
""
],
[
"Burdman",
"G.",
""
],
[
"Ciuchini",
"M.",
""
],
[
"Convery",
"M.",
""
],
[
"Dasu",
"S.",
""
],
[
"Datta",
"A.",
""
],
[
"Datta",
"M.",
""
],
[
"Dedes",
"A.",
""
],
[
"del Re",
"D.",
""
],
[
"Demir",
"D. A.",
""
],
[
"Di Lodovico",
"F.",
""
],
[
"Dujmic",
"D.",
""
],
[
"Eigen",
"G.",
""
],
[
"Egede",
"U.",
""
],
[
"Falk",
"A.",
""
],
[
"Feldmann",
"Th.",
""
],
[
"Gopalakrishna",
"S.",
""
],
[
"Goto",
"T.",
""
],
[
"Graziani",
"K.",
""
],
[
"Grinstein",
"B.",
""
],
[
"Gritsan",
"A.",
""
],
[
"Gronau",
"M.",
""
],
[
"Grossman",
"Y.",
""
],
[
"Hashimoto",
"S.",
""
],
[
"Hazumi",
"M.",
""
],
[
"Hewett",
"J.",
""
],
[
"Hiller",
"G.",
""
],
[
"Hisano",
"J.",
""
],
[
"Hitlin",
"D. G.",
""
],
[
"Hulsbergen",
"W.",
""
],
[
"Hurth",
"T.",
""
],
[
"Igonkina",
"O.",
""
],
[
"Isidori",
"G.",
""
],
[
"Jessop",
"C.",
""
],
[
"Kagan",
"A. L.",
""
],
[
"Ko",
"P.",
""
],
[
"Kolda",
"C.",
""
],
[
"Koppenburg",
"P.",
""
],
[
"Koptchev",
"V.",
""
],
[
"Krueger",
"F.",
""
],
[
"Langenegger",
"U.",
""
],
[
"Libby",
"J.",
""
],
[
"Ligeti",
"Z.",
""
],
[
"Lillie",
"B.",
""
],
[
"London",
"D.",
""
],
[
"Luke",
"M.",
""
],
[
"Lunghi",
"E.",
""
],
[
"Mackenzie",
"P.",
""
],
[
"Manohar",
"A.",
""
],
[
"Matchev",
"K.",
""
],
[
"Moore",
"T.",
""
],
[
"Neubert",
"M.",
""
],
[
"Oh",
"S.",
""
],
[
"Okada",
"Y.",
""
],
[
"Parkhomenko",
"Y.",
""
],
[
"Petrov",
"A. A.",
""
],
[
"Pirjol",
"D.",
""
],
[
"Poschenrieder",
"A.",
""
],
[
"Purohit",
"M.",
""
],
[
"Quinn",
"H.",
""
],
[
"Rizzo",
"T. G.",
""
],
[
"Robertson",
"S. H.",
""
],
[
"Roodman",
"A.",
""
],
[
"Rosner",
"J.",
""
],
[
"Rothstein",
"I.",
""
],
[
"Rubin",
"A.",
""
],
[
"Ryd",
"A.",
""
],
[
"Shelkov",
"V. G.",
""
],
[
"Shimizu",
"Y.",
""
],
[
"Shindou",
"T.",
""
],
[
"Silvestrini",
"L.",
""
],
[
"Sinha",
"N.",
""
],
[
"Sinha",
"R.",
""
],
[
"Soffer",
"A.",
""
],
[
"Soni",
"A.",
""
],
[
"Spranger",
"M.",
""
],
[
"Staengle",
"H.",
""
],
[
"Stewart",
"I.",
""
],
[
"Tanaka",
"M.",
""
],
[
"Vempati",
"S. K.",
""
],
[
"Vives",
"O.",
""
],
[
"Voloshin",
"M.",
""
],
[
"Weiler",
"A.",
""
],
[
"Wells",
"J. D.",
""
],
[
"Wilkinson",
"G.",
""
],
[
"Williams",
"D. C.",
""
],
[
"Willocq",
"S.",
""
],
[
"Wyler",
"D.",
""
],
[
"Zupan",
"J.",
""
]
] | The Proceedings of the 2003 SLAC Workshops on flavor physics with a high luminosity asymmetric e+e- collider. The sensitivity of flavor physics to physics beyond the Standard Model is addressed in detail, in the context of the improvement of experimental measurements and theoretical calculations. |
2206.10320 | Papia Panda | Papia Panda, Monojit Ghosh, Priya Mishra, Rukmani Mohanta | Extracting the best physics sensitivity from T2HKK: A study on optimal
detector volume | 22 pages, 12 figures, 3 tables, Version accepted for publication in
Phys. Rev. D | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | T2HK is an upcoming long-baseline experiment in Japan which will have two
water Cherenkov detector tanks of 187 kt volume each at distance of 295 km from
the source. An alternative project, T2HKK is also under consideration where one
of the water tanks will be moved to Korea at a distance of 1100 km. The flux at
295 km will cover the first oscillation maximum and the flux at 1100 km will
mainly cover the second oscillation maximum. As physics sensitivity at the dual
baseline rely on variation in statistics, dependence of systematic uncertainty,
effect of second oscillation maximum and matter density, 187 kt detector volume
at 295 km and 187 kt detector volume at 1100 km may not be the optimal
configuration of T2HKK. Therefore, we have tried to optimize the ratio of the
detector volume at both the locations by studying the interplay between the
above mentioned parameters. For the analysis of neutrino mass hierarchy, octant
of $\theta_{23}$ and CP precision, we have considered two values of
$\delta_{\rm{CP}}$ as 270$^\circ$ and $0^\circ$ and for CP violation we have
considered the value of $\delta_{\rm CP}= 270^\circ$. These values are
motivated by the current best-fit values of this parameter as obtained from the
experiments T2K and NO$\nu$A. Interestingly we find that if the systematic
uncertainty is negligible then the T2HK setup i.e., when both the detector
tanks are placed at 295 km gives the best results in terms of hierarchy
sensitivity at $\delta_{\rm CP}= 270^\circ$, octant sensitivity, CP violation
sensitivity and CP precision sensitivity at $\delta_{\rm CP}= 0^\circ$. For
current values of systematic errors, we find that neither T2HK, nor T2HKK setup
is giving better results for hierarchy, CP violation and CP precision
sensitivity. The optimal detector volume which is of the range between 255 kt
to 345 kt at 1100 km gives better results in those above mentioned parameters.
| [
{
"created": "Tue, 21 Jun 2022 12:40:58 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 12:57:17 GMT",
"version": "v2"
}
] | 2022-09-27 | [
[
"Panda",
"Papia",
""
],
[
"Ghosh",
"Monojit",
""
],
[
"Mishra",
"Priya",
""
],
[
"Mohanta",
"Rukmani",
""
]
] | T2HK is an upcoming long-baseline experiment in Japan which will have two water Cherenkov detector tanks of 187 kt volume each at distance of 295 km from the source. An alternative project, T2HKK is also under consideration where one of the water tanks will be moved to Korea at a distance of 1100 km. The flux at 295 km will cover the first oscillation maximum and the flux at 1100 km will mainly cover the second oscillation maximum. As physics sensitivity at the dual baseline rely on variation in statistics, dependence of systematic uncertainty, effect of second oscillation maximum and matter density, 187 kt detector volume at 295 km and 187 kt detector volume at 1100 km may not be the optimal configuration of T2HKK. Therefore, we have tried to optimize the ratio of the detector volume at both the locations by studying the interplay between the above mentioned parameters. For the analysis of neutrino mass hierarchy, octant of $\theta_{23}$ and CP precision, we have considered two values of $\delta_{\rm{CP}}$ as 270$^\circ$ and $0^\circ$ and for CP violation we have considered the value of $\delta_{\rm CP}= 270^\circ$. These values are motivated by the current best-fit values of this parameter as obtained from the experiments T2K and NO$\nu$A. Interestingly we find that if the systematic uncertainty is negligible then the T2HK setup i.e., when both the detector tanks are placed at 295 km gives the best results in terms of hierarchy sensitivity at $\delta_{\rm CP}= 270^\circ$, octant sensitivity, CP violation sensitivity and CP precision sensitivity at $\delta_{\rm CP}= 0^\circ$. For current values of systematic errors, we find that neither T2HK, nor T2HKK setup is giving better results for hierarchy, CP violation and CP precision sensitivity. The optimal detector volume which is of the range between 255 kt to 345 kt at 1100 km gives better results in those above mentioned parameters. |
hep-ph/9409250 | Sangyong Jeon | Sangyong Jeon | Hydrodynamic Transport Coefficients in Relativistic Scalar Field Theory | 116 pages. An error in printing the figures file is corrected. The
bulk viscosity sections are corrected and entirely rewritten. 38 figures in
post-script format. One style file is included | Phys.Rev. D52 (1995) 3591-3642 | 10.1103/PhysRevD.52.3591 | UW/PT-94 | hep-ph | null | Hydrodynamic transport coefficients may be evaluated from first principles in
a weakly coupled scalar field theory at arbitrary temperature. In a theory with
cubic and quartic interactions, the infinite class of diagrams which contribute
to the leading weak coupling behavior are identified and summed. The resulting
expression may be reduced to a single linear integral equation, which is shown
to be identical to the corresponding result obtained from a linearized
Boltzmann equation describing effective thermal excitations with temperature
dependent masses and scattering amplitudes. The effective Boltzmann equation is
valid even at very high temperature where the thermal lifetime and mean free
path are short compared to the Compton wavelength of the fundamental particles.
Numerical results for the shear and the bulk viscosities are presented.
| [
{
"created": "Thu, 8 Sep 1994 02:01:15 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Apr 1995 09:06:38 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Apr 1995 23:30:41 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Jeon",
"Sangyong",
""
]
] | Hydrodynamic transport coefficients may be evaluated from first principles in a weakly coupled scalar field theory at arbitrary temperature. In a theory with cubic and quartic interactions, the infinite class of diagrams which contribute to the leading weak coupling behavior are identified and summed. The resulting expression may be reduced to a single linear integral equation, which is shown to be identical to the corresponding result obtained from a linearized Boltzmann equation describing effective thermal excitations with temperature dependent masses and scattering amplitudes. The effective Boltzmann equation is valid even at very high temperature where the thermal lifetime and mean free path are short compared to the Compton wavelength of the fundamental particles. Numerical results for the shear and the bulk viscosities are presented. |
2305.09338 | Muhammad Al-Zafar Khan | Muhammad Al-Zafar Khan, Mervlyn Moodley, Francesco Petruccione | Soliton Solutions and Conservation Laws for a Self-interacting Scalar
Field in \(\phi^{4}\) Theory | 19 pages, 2 figures | null | null | null | hep-ph hep-th math-ph math.MP quant-ph | http://creativecommons.org/licenses/by/4.0/ | We calculate soliton solutions to the scalar field equation of motion that
arises for the 4th-order extended Lagrangian (\(\phi^{4}\) theory) in quantum
field theory using the extended hyperbolic tangent and the sine-cosine methods.
Using the former technique, ten complex soliton waves are obtained; we
graphically represent three of these profiles using density plots. In the
latter case, two real soliton solutions are obtained, of which, we demonstrate
the wave profile for the positive case. Using the multiplier method, we
calculate conservation laws in \((1 + 1)\)-, \((2 + 1)\)-, and \((3 +
1)\)-dimensions producing three, six, and ten conservation laws respectively.
Lastly, we reflect on the application of conservation laws in particle physics
and phenomenology.
| [
{
"created": "Tue, 16 May 2023 10:33:55 GMT",
"version": "v1"
}
] | 2023-05-17 | [
[
"Khan",
"Muhammad Al-Zafar",
""
],
[
"Moodley",
"Mervlyn",
""
],
[
"Petruccione",
"Francesco",
""
]
] | We calculate soliton solutions to the scalar field equation of motion that arises for the 4th-order extended Lagrangian (\(\phi^{4}\) theory) in quantum field theory using the extended hyperbolic tangent and the sine-cosine methods. Using the former technique, ten complex soliton waves are obtained; we graphically represent three of these profiles using density plots. In the latter case, two real soliton solutions are obtained, of which, we demonstrate the wave profile for the positive case. Using the multiplier method, we calculate conservation laws in \((1 + 1)\)-, \((2 + 1)\)-, and \((3 + 1)\)-dimensions producing three, six, and ten conservation laws respectively. Lastly, we reflect on the application of conservation laws in particle physics and phenomenology. |
hep-ph/9406328 | null | Dae-Gyu Lee and R. N. Mohapatra | Automatically R-Conserving SUSY SO(10) Models and Mixed Light Higgs
Doublets | UMD-PP-94-166 (some minor misprints corrected; Latex file; one figure
available on request ) | Phys.Rev. D51 (1995) 1353-1361 | 10.1103/PhysRevD.51.1353 | null | hep-ph | null | In automatic R-parity conserving SO(10) models, the simplest way to
accomodate realistic fermion masses is to demand that that the light Higgs
doublets be linear combinations of the {10} and {126}-bar grand unified Higgs
representations. We study the realization of this mixed light Higgs property
consistent with doublet-triplet splitting in a minimal model and discuss its
predictions for neutrino masses and implications for proton decay.
| [
{
"created": "Thu, 16 Jun 1994 20:33:16 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 1994 19:03:47 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jun 1994 17:58:56 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Lee",
"Dae-Gyu",
""
],
[
"Mohapatra",
"R. N.",
""
]
] | In automatic R-parity conserving SO(10) models, the simplest way to accomodate realistic fermion masses is to demand that that the light Higgs doublets be linear combinations of the {10} and {126}-bar grand unified Higgs representations. We study the realization of this mixed light Higgs property consistent with doublet-triplet splitting in a minimal model and discuss its predictions for neutrino masses and implications for proton decay. |
hep-ph/0305051 | Erik Bartos | E. Bartos, S. Dubnicka, A. Z. Dubnickova, E.A.Kuraev, E.Zemlyanaya | Is there any room for new physics in the muon g-2 problem? | Contribution on International Conference Hadron Structure '02,
September 23.-27., 2002, Herlany, Slovakia | null | null | null | hep-ph | null | Is there any room for new physics in the muon g-2 problem?
| [
{
"created": "Mon, 5 May 2003 22:43:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bartos",
"E.",
""
],
[
"Dubnicka",
"S.",
""
],
[
"Dubnickova",
"A. Z.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Zemlyanaya",
"E.",
""
]
] | Is there any room for new physics in the muon g-2 problem? |
hep-ph/0202177 | Tomislav Prokopec | Kimmo Kainulainen, Tomislav Prokopec, Michael G. Schmidt and Steffen
Weinstock | Semiclassical force for electroweak baryogenesis: three-dimensional
derivation | 19 pages | Phys.Rev.D66:043502,2002 | 10.1103/PhysRevD.66.043502 | CERN-TH/2002-011, HD-THEP-02-7, NORDITA 2002-5 HE | hep-ph | null | We derive a semiclassical transport equation for fermions propagating in the
presence of a CP-violating planar bubble wall at a first order electroweak
phase transition. Starting from the Kadanoff-Baym (KB) equation for the
two-point (Wightman) function we perform an expansion in gradients, or
equivalently in the Planck constant h-bar. We show that to first order in h-bar
the KB equations have a spectral solution, which allows for an on-shell
description of the plasma excitations. The CP-violating force acting on these
excitations is found to be enhanced by a boost factor in comparison with the
1+1-dimensional case studied in a former paper. We find that an identical
semiclassical force can be obtained by the WKB method. Applications to the MSSM
are also mentioned.
| [
{
"created": "Tue, 19 Feb 2002 12:34:16 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kainulainen",
"Kimmo",
""
],
[
"Prokopec",
"Tomislav",
""
],
[
"Schmidt",
"Michael G.",
""
],
[
"Weinstock",
"Steffen",
""
]
] | We derive a semiclassical transport equation for fermions propagating in the presence of a CP-violating planar bubble wall at a first order electroweak phase transition. Starting from the Kadanoff-Baym (KB) equation for the two-point (Wightman) function we perform an expansion in gradients, or equivalently in the Planck constant h-bar. We show that to first order in h-bar the KB equations have a spectral solution, which allows for an on-shell description of the plasma excitations. The CP-violating force acting on these excitations is found to be enhanced by a boost factor in comparison with the 1+1-dimensional case studied in a former paper. We find that an identical semiclassical force can be obtained by the WKB method. Applications to the MSSM are also mentioned. |
1203.5153 | John F. Donoghue | Ufuk Aydemir, Mohamed M. Anber and John F. Donoghue | Self-healing of unitarity in effective field theories and the onset of
new physics | 11 pages, 5 figures, typos corrected, reference added | null | 10.1103/PhysRevD.86.014025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In effective field theories it is common to identify the onset of new physics
with the violation of tree-level unitarity. However, we show that this is
parametrically incorrect in the case of chiral perturbation theory, and is
probably theoretically incorrect in general. In the chiral theory, we explore
perturbative unitarity violation as a function of the number of colors and the
number of flavors, holding the scale of the "new physics" (i.e. QCD) fixed.
This demonstrates that the onset of new physics is parametrically uncorrelated
with tree-unitarity violation. When the latter scale is lower than that of new
physics, the effective theory must heal its unitarity violation itself, which
is expected because the field theory satisfies the requirements of unitarity.
In the chiral theory, the self-healing results in a resonant structure with
scalar quantum numbers. In the electroweak variant of this argument, the
structure must have the properties of the Higgs and must couple proportional to
the mass in both gauge boson and fermion scattering. A similar example can be
seen in the case of general relativity coupled to multiple matter fields, where
iteration of the vacuum polarization diagram restores unitarity. We present
arguments that suggest the correct identification should be connected to the
onset of inelasticity rather than unitarity violation. We describe how the
onset of inelasticity can occur in the effective theory, although it does not
appear possible to predict the onset reliably.
| [
{
"created": "Fri, 23 Mar 2012 01:52:13 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2012 13:18:24 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Aydemir",
"Ufuk",
""
],
[
"Anber",
"Mohamed M.",
""
],
[
"Donoghue",
"John F.",
""
]
] | In effective field theories it is common to identify the onset of new physics with the violation of tree-level unitarity. However, we show that this is parametrically incorrect in the case of chiral perturbation theory, and is probably theoretically incorrect in general. In the chiral theory, we explore perturbative unitarity violation as a function of the number of colors and the number of flavors, holding the scale of the "new physics" (i.e. QCD) fixed. This demonstrates that the onset of new physics is parametrically uncorrelated with tree-unitarity violation. When the latter scale is lower than that of new physics, the effective theory must heal its unitarity violation itself, which is expected because the field theory satisfies the requirements of unitarity. In the chiral theory, the self-healing results in a resonant structure with scalar quantum numbers. In the electroweak variant of this argument, the structure must have the properties of the Higgs and must couple proportional to the mass in both gauge boson and fermion scattering. A similar example can be seen in the case of general relativity coupled to multiple matter fields, where iteration of the vacuum polarization diagram restores unitarity. We present arguments that suggest the correct identification should be connected to the onset of inelasticity rather than unitarity violation. We describe how the onset of inelasticity can occur in the effective theory, although it does not appear possible to predict the onset reliably. |
1308.0575 | J. G. Ferreira Jr | J. G. Ferreira Jr., C. A. de S. Pires, P. S. Rodrigues da Silva, A.
Sampieri | The Higgs sector of the SUSY reduced 3-3-1 model | 18 pages, 5 figures, new references added and figures resolution
improved | Phys. Rev. D 88, 105013 (2013) | 10.1103/PhysRevD.88.105013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A supersymmetric version of the recently proposed reduced minimal 3-3-1 model
is considered and its Higgs sector is investigated. We focus on the mass
spectrum of the lightest scalars of the model. We show that Higgs mass of 125
GeV requires substantial radiative corrections. However, stops may develop
small mixing and must have mass around TeV. Moreover, some soft SUSY breaking
terms may lie at the electroweak scale, which alleviates some tension
concerning fine tuning of the related parameters. The lightest doubly charged
scalar may have mass around few hundreds of GeV, which can be probed at the
LHC, while the remaining scalars of the model have masses at TeV scale.
| [
{
"created": "Fri, 2 Aug 2013 18:31:49 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Aug 2013 16:38:25 GMT",
"version": "v2"
}
] | 2013-11-14 | [
[
"Ferreira",
"J. G.",
"Jr."
],
[
"Pires",
"C. A. de S.",
""
],
[
"da Silva",
"P. S. Rodrigues",
""
],
[
"Sampieri",
"A.",
""
]
] | A supersymmetric version of the recently proposed reduced minimal 3-3-1 model is considered and its Higgs sector is investigated. We focus on the mass spectrum of the lightest scalars of the model. We show that Higgs mass of 125 GeV requires substantial radiative corrections. However, stops may develop small mixing and must have mass around TeV. Moreover, some soft SUSY breaking terms may lie at the electroweak scale, which alleviates some tension concerning fine tuning of the related parameters. The lightest doubly charged scalar may have mass around few hundreds of GeV, which can be probed at the LHC, while the remaining scalars of the model have masses at TeV scale. |
1804.02886 | Christian Carimalo | Christian Carimalo | Spinor Calculus in Particle Physics | 208 pages, in French, 24 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Methods of spinor calculus in particle physics are described in this series
of four chapters written in french. A special emphasis is made on the
well-known helicity-coupling scheme which is the guiding thread of all these
methods. Numerous explicit formulas are given for projectors onto two-particles
helicity states as well as for bilinears of Dirac spinors, for the s and t
channels of a given two-body process involving spin 1/2 particles. In the last
chapter, applications to various elementary processes are given.
| [
{
"created": "Mon, 9 Apr 2018 09:50:58 GMT",
"version": "v1"
}
] | 2018-04-10 | [
[
"Carimalo",
"Christian",
""
]
] | Methods of spinor calculus in particle physics are described in this series of four chapters written in french. A special emphasis is made on the well-known helicity-coupling scheme which is the guiding thread of all these methods. Numerous explicit formulas are given for projectors onto two-particles helicity states as well as for bilinears of Dirac spinors, for the s and t channels of a given two-body process involving spin 1/2 particles. In the last chapter, applications to various elementary processes are given. |
hep-ph/9812264 | Csaba Boros | A.W. Thomas and C. Boros | Pion Exchange and the H1 Forward Spectrometer Data | title changed, new references added | Eur.Phys.J.C9:267-269,1999 | 10.1007/s100520050530 | ADP-98-79/T346 | hep-ph hep-ex | null | We point out that the $\Delta\pi$ component of the nucleon wave function is
vital to the interpretation of the recent H1 data for leading baryon
production. While the $n/p$ ratio is equal to two with the $N\pi$ component
alone, the inclusion of the $\Delta\pi$ component brings this ratio very near
to unity, as observed in the experiment. This result demonstrates that pion
exchange can not only account for leading neutron but also for a large fraction
of the leading proton production.
| [
{
"created": "Mon, 7 Dec 1998 00:44:57 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Mar 1999 05:40:11 GMT",
"version": "v2"
}
] | 2010-02-17 | [
[
"Thomas",
"A. W.",
""
],
[
"Boros",
"C.",
""
]
] | We point out that the $\Delta\pi$ component of the nucleon wave function is vital to the interpretation of the recent H1 data for leading baryon production. While the $n/p$ ratio is equal to two with the $N\pi$ component alone, the inclusion of the $\Delta\pi$ component brings this ratio very near to unity, as observed in the experiment. This result demonstrates that pion exchange can not only account for leading neutron but also for a large fraction of the leading proton production. |
1002.3982 | Sergei Chekanov V. | S.Chekanov, J.Proudfoot | Searches for TeV-scale particles at the LHC using jet shapes | 14 pages, 6 figures | Phys.Rev.D81:114038,2010 | 10.1103/PhysRevD.81.114038 | ANL-HEP-PR-10-2 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New particles at the TeV scale can decay hadronically with strongly
collimated jets, thus the standard reconstruction methods based on
invariant-masses of well-separated jets can fail. We discuss how to identify
such particles in pp collisions at the LHC using jet shapes which help to
reduce the contribution of QCD-induced events. We focus on a rather generic
example X to ttbar to hadrons, with X being a heavy particle, but the approach
is well suited for reconstruction of other decay channels characterized by a
cascade decay of known states.
| [
{
"created": "Sun, 21 Feb 2010 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 2010 22:15:17 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Apr 2010 15:22:32 GMT",
"version": "v3"
},
{
"created": "Wed, 2 Jun 2010 19:21:19 GMT",
"version": "v4"
}
] | 2014-11-20 | [
[
"Chekanov",
"S.",
""
],
[
"Proudfoot",
"J.",
""
]
] | New particles at the TeV scale can decay hadronically with strongly collimated jets, thus the standard reconstruction methods based on invariant-masses of well-separated jets can fail. We discuss how to identify such particles in pp collisions at the LHC using jet shapes which help to reduce the contribution of QCD-induced events. We focus on a rather generic example X to ttbar to hadrons, with X being a heavy particle, but the approach is well suited for reconstruction of other decay channels characterized by a cascade decay of known states. |
1106.5016 | Renato Fonseca | Renato M. Fonseca | Calculating the renormalisation group equations of a SUSY model with
Susyno | Describes version 1.1 of the program (matches published version). The
program's webpage is in http://web.ist.utl.pt/renato.fonseca/susyno.html | null | 10.1016/j.cpc.2012.05.017 | CFTP/11-011 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Susyno is a Mathematica package dedicated to the computation of the 2-loop
renormalisation group equations of a supersymmetric model based on any gauge
group (the only exception being multiple U(1) groups) and for any field
content.
| [
{
"created": "Fri, 24 Jun 2011 17:07:12 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jun 2012 16:48:49 GMT",
"version": "v2"
}
] | 2012-06-07 | [
[
"Fonseca",
"Renato M.",
""
]
] | Susyno is a Mathematica package dedicated to the computation of the 2-loop renormalisation group equations of a supersymmetric model based on any gauge group (the only exception being multiple U(1) groups) and for any field content. |
0902.3322 | Gi-Chol Cho | Gi-Chol Cho and Yoshimi Kanehata | Kaluza-Klein gluon and b-jet forward-backward asymmetry | 5 pages, 4 figures. Version to appear in Phys.Lett.B | Phys.Lett.B694:134-137,2010 | 10.1016/j.physletb.2010.09.057 | OCHA-PP-300 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The forward-backward asymmetry of $b$-quark jets on the $Z$-pole measured at
LEP/SLD experiments shows us -2.8-$\sigma$ deviation from the Standard Model
(SM) prediction. We examine a possibility of Kaluza-Klein (KK) gluon to explain
the $\afbb$ data in a scenario based on the warped extra dimension model by
Randall and Sundrum. In this scenario, the KK gluon strongly couples to
$b$-quark by an appropriate choice of the bulk quark mass terms. We find that
the $\afbb$ data could be explained if the KK gluon mass is few hundred GeV.
Constraints on our scenario from the hadron collider experiments are discussed.
| [
{
"created": "Thu, 19 Feb 2009 08:30:39 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Mar 2010 08:02:44 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Sep 2010 23:14:10 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Cho",
"Gi-Chol",
""
],
[
"Kanehata",
"Yoshimi",
""
]
] | The forward-backward asymmetry of $b$-quark jets on the $Z$-pole measured at LEP/SLD experiments shows us -2.8-$\sigma$ deviation from the Standard Model (SM) prediction. We examine a possibility of Kaluza-Klein (KK) gluon to explain the $\afbb$ data in a scenario based on the warped extra dimension model by Randall and Sundrum. In this scenario, the KK gluon strongly couples to $b$-quark by an appropriate choice of the bulk quark mass terms. We find that the $\afbb$ data could be explained if the KK gluon mass is few hundred GeV. Constraints on our scenario from the hadron collider experiments are discussed. |
1806.05970 | Alan D. Martin | V.A. Khoze, A.D. Martin and M.G. Ryskin | Elastic and diffractive scattering at the LHC | 17 pages, 4 figures, version published in Phys. Lett. B | null | 10.1016/j.physletb.2018.07.054 | IPPP/18/42 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the new TOTEM data on elastic $pp$ scattering at 13 TeV, we study
the possibility to describe all the diffractive collider data ($\sigma_{\rm
tot}, d\sigma_{\rm el}/dt$, $\rho\equiv$Re$A$/Im$A$, \sd) in a wide interval of
energy (0.0625 to 13 TeV) in the framework of a two-channel eikonal model. We
show that a satisfactory description can be achieved without an odd-signature
(Odderon) exchange contribution. We consider the possible role of the QCD
Odderon which may improve the description of $\rho$ and discuss the importance
of the odd-signature term if the amplitude were to exceed the black disc limit.
| [
{
"created": "Fri, 15 Jun 2018 13:52:49 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Aug 2018 09:20:06 GMT",
"version": "v2"
}
] | 2018-10-17 | [
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | Inspired by the new TOTEM data on elastic $pp$ scattering at 13 TeV, we study the possibility to describe all the diffractive collider data ($\sigma_{\rm tot}, d\sigma_{\rm el}/dt$, $\rho\equiv$Re$A$/Im$A$, \sd) in a wide interval of energy (0.0625 to 13 TeV) in the framework of a two-channel eikonal model. We show that a satisfactory description can be achieved without an odd-signature (Odderon) exchange contribution. We consider the possible role of the QCD Odderon which may improve the description of $\rho$ and discuss the importance of the odd-signature term if the amplitude were to exceed the black disc limit. |
0910.5517 | Kenji Kadota | Kenji Kadota and Jing Shao | Enhanced Tau Lepton Signatures at LHC in Constrained Supersymmetric
Seesaw | 15 pages, 3 figures, references added | Phys.Rev.D80:115004,2009 | 10.1103/PhysRevD.80.115004 | MCTP-09-50 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the possible enhancement of the tau lepton events at LHC when the
left-handed stau doublet becomes light (which can be even lighter than the
right-handed stau). This is illustrated in the constrained supersymmetric
seesaw model where the slepton doublet mass is suppressed by the effects of a
large neutrino Yukawa coupling. We study a few representative parameter sets in
the sneutrino coannihilation regions where the tau sneutrino is NLSP and the
stau coannihilation regions where the stau is NLSP both of which yield the
thermal neutralino LSP abundance determined by WMAP.
| [
{
"created": "Wed, 28 Oct 2009 23:04:11 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Dec 2009 16:00:02 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Kadota",
"Kenji",
""
],
[
"Shao",
"Jing",
""
]
] | We discuss the possible enhancement of the tau lepton events at LHC when the left-handed stau doublet becomes light (which can be even lighter than the right-handed stau). This is illustrated in the constrained supersymmetric seesaw model where the slepton doublet mass is suppressed by the effects of a large neutrino Yukawa coupling. We study a few representative parameter sets in the sneutrino coannihilation regions where the tau sneutrino is NLSP and the stau coannihilation regions where the stau is NLSP both of which yield the thermal neutralino LSP abundance determined by WMAP. |
hep-ph/0310079 | Urs Wiedemann A. | Carlos A. Salgado, Urs Achim Wiedemann | Medium Modification of Jet Shapes and Jet Multiplicities | 4 pages, Latex, 3 eps figures. version2: error in eq. (6) corrected,
Fig. 2 changed accordingly, conclusions unchanged | Phys.Rev.Lett. 93 (2004) 042301 | 10.1103/PhysRevLett.93.042301 | CERN-TH/2003-244 | hep-ph | null | Medium-induced parton energy loss is widely considered to underly the
suppression of high-pt leading hadron spectra in 200 GeV/A Au+Au collisions at
RHIC. Its description implies a characteristic kt-broadening of the subleading
hadronic fragments associated to the hard parton. However, this latter effect
is more difficult to measure and remained elusive so far. Here, we discuss how
it affects genuine jet observables which are accessible at LHC and possibly at
RHIC. We find that the kt-broadening of jet multiplicity distributions provides
a very sensitive probe of the properties of dense QCD matter, whereas the
sensitivity of jet energy distributions is much weaker. In particular, the
sensitive kinematic range of jet multiplicity distributions is almost
unaffected by the high multiplicity background.
| [
{
"created": "Tue, 7 Oct 2003 18:18:34 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Oct 2003 14:03:48 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Salgado",
"Carlos A.",
""
],
[
"Wiedemann",
"Urs Achim",
""
]
] | Medium-induced parton energy loss is widely considered to underly the suppression of high-pt leading hadron spectra in 200 GeV/A Au+Au collisions at RHIC. Its description implies a characteristic kt-broadening of the subleading hadronic fragments associated to the hard parton. However, this latter effect is more difficult to measure and remained elusive so far. Here, we discuss how it affects genuine jet observables which are accessible at LHC and possibly at RHIC. We find that the kt-broadening of jet multiplicity distributions provides a very sensitive probe of the properties of dense QCD matter, whereas the sensitivity of jet energy distributions is much weaker. In particular, the sensitive kinematic range of jet multiplicity distributions is almost unaffected by the high multiplicity background. |
1402.3298 | James Barnard Dr | James Barnard, Ben Farmer | A simple technique for combining simplified models and its application
to direct stop production | 25 pages, data included in source. V3: new content added, version
accepted for publication | null | 10.1007/JHEP06(2014)132 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The results of many LHC searches for supersymmetric particles are interpreted
using simplified models, in which one fixes the masses and couplings of most
sparticles then scans over a few remaining masses of interest. We present a new
technique for combining multiple simplified models (that requires no additional
simulation) thereby highlighting the utility and limitations of simplified
models in general, and demonstrating a simple way of improving LHC search
strategies. The technique is used to derive limits on the stop mass that are
model independent, modulo some reasonably generic assumptions which are
quantified precisely. We find that current ATLAS and CMS results exclude stop
masses up to 340 GeV for neutralino masses up to 120 GeV, provided that the
total branching ratio into channels other than top-neutralino and
bottom-chargino is small, and that there is no mass difference smaller than 10
GeV in the mass spectrum. In deriving these limits we place upper bounds on the
branching ratios for complete stop pair decay processes for many values of the
stop, neutralino and chargino masses. These are available with this paper.
| [
{
"created": "Thu, 13 Feb 2014 21:00:17 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Mar 2014 02:24:22 GMT",
"version": "v2"
},
{
"created": "Tue, 27 May 2014 00:35:04 GMT",
"version": "v3"
}
] | 2015-06-18 | [
[
"Barnard",
"James",
""
],
[
"Farmer",
"Ben",
""
]
] | The results of many LHC searches for supersymmetric particles are interpreted using simplified models, in which one fixes the masses and couplings of most sparticles then scans over a few remaining masses of interest. We present a new technique for combining multiple simplified models (that requires no additional simulation) thereby highlighting the utility and limitations of simplified models in general, and demonstrating a simple way of improving LHC search strategies. The technique is used to derive limits on the stop mass that are model independent, modulo some reasonably generic assumptions which are quantified precisely. We find that current ATLAS and CMS results exclude stop masses up to 340 GeV for neutralino masses up to 120 GeV, provided that the total branching ratio into channels other than top-neutralino and bottom-chargino is small, and that there is no mass difference smaller than 10 GeV in the mass spectrum. In deriving these limits we place upper bounds on the branching ratios for complete stop pair decay processes for many values of the stop, neutralino and chargino masses. These are available with this paper. |
2002.02935 | Tanmay Kumar Poddar | Tanmay Kumar Poddar, Subhendra Mohanty, Soumya Jana | Constraints on long range force from perihelion precession of planets in
a gauged $L_e-L_{\mu,\tau}$ scenario | 19 pages, 3 figures, 2 tables | null | 10.1140/epjc/s10052-021-09078-9 | null | hep-ph astro-ph.EP astro-ph.HE gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard model particles can be gauged in an anomaly free way by three
possible gauge symmetries namely ${L_e-L_\mu}$, ${L_e-L_\tau}$, and
${L_\mu-L_\tau}$. Of these, ${L_e-L_\mu}$ and ${L_e-L_\tau}$ forces can mediate
between the Sun and the planets and change the perihelion precession of
planetary orbits. It is well known that a deviation from the $1/r^2$ Newtonian
force can give rise to a perihelion advancement in the planetary orbit, for
instance, as in the well known case of Einstein's gravity which was tested from
the observation of the perihelion advancement of the Mercury. We consider the
long range Yukawa potential which arises between the Sun and the planets if the
mass of the gauge boson is $M_{Z^{\prime}}\leq \mathcal{O}(10^{-19})\rm {eV}$.
We derive the formula of perihelion advancement for Yukawa type fifth force due
to the mediation of such $U(1)_{L_e-L_{\mu,\tau}}$ gauge bosons. The perihelion
advancement for Yukawa potential is proportional to the square of the semi
major axis of the orbit for small $M_{Z^{\prime}}$, unlike GR, where it is
largest for the nearest planet. However for higher values of $M_{Z^{\prime}}$,
an exponential suppression of the perihelion advancement occurs. We take the
observational limits for all planets for which the perihelion advancement is
measured and we obtain the upper bound on the gauge boson coupling $g$ for all
the planets. The Mars gives the stronger bound on $g$ for the mass range $\leq
10^{-19}\rm{eV}$ and we obtain the exclusion plot. This mass range of gauge
boson can be a possible candidate of fuzzy dark matter whose effect can
therefore be observed in the precession measurement of the planetary orbits.
| [
{
"created": "Wed, 5 Feb 2020 09:20:38 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jul 2020 07:09:47 GMT",
"version": "v2"
}
] | 2021-04-21 | [
[
"Poddar",
"Tanmay Kumar",
""
],
[
"Mohanty",
"Subhendra",
""
],
[
"Jana",
"Soumya",
""
]
] | The standard model particles can be gauged in an anomaly free way by three possible gauge symmetries namely ${L_e-L_\mu}$, ${L_e-L_\tau}$, and ${L_\mu-L_\tau}$. Of these, ${L_e-L_\mu}$ and ${L_e-L_\tau}$ forces can mediate between the Sun and the planets and change the perihelion precession of planetary orbits. It is well known that a deviation from the $1/r^2$ Newtonian force can give rise to a perihelion advancement in the planetary orbit, for instance, as in the well known case of Einstein's gravity which was tested from the observation of the perihelion advancement of the Mercury. We consider the long range Yukawa potential which arises between the Sun and the planets if the mass of the gauge boson is $M_{Z^{\prime}}\leq \mathcal{O}(10^{-19})\rm {eV}$. We derive the formula of perihelion advancement for Yukawa type fifth force due to the mediation of such $U(1)_{L_e-L_{\mu,\tau}}$ gauge bosons. The perihelion advancement for Yukawa potential is proportional to the square of the semi major axis of the orbit for small $M_{Z^{\prime}}$, unlike GR, where it is largest for the nearest planet. However for higher values of $M_{Z^{\prime}}$, an exponential suppression of the perihelion advancement occurs. We take the observational limits for all planets for which the perihelion advancement is measured and we obtain the upper bound on the gauge boson coupling $g$ for all the planets. The Mars gives the stronger bound on $g$ for the mass range $\leq 10^{-19}\rm{eV}$ and we obtain the exclusion plot. This mass range of gauge boson can be a possible candidate of fuzzy dark matter whose effect can therefore be observed in the precession measurement of the planetary orbits. |
hep-ph/0605170 | Ulrich Haisch | Ulrich Haisch | Theoretical Status of K->pinunubar Decays | 5 pages, 2 figures, talk given at the XLIst Rencontres de Moriond QCD
and High Energy Hadronic Interactions, La Thuile, Aosta Valley, Italy, March
18--25, 2006 | null | null | null | hep-ph | null | We present a concise review of the theoretical status of rare K->pinunubar
decays in and beyond the standard model. Particular attention is thereby
devoted to the recent calculation of the next-to-next-to-leading order
corrections to the charm quark contribution of K^+->pi^+nunubar which removes
the last relevant theoretical uncertainty from the K->pinunubar system.
| [
{
"created": "Mon, 15 May 2006 13:58:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Haisch",
"Ulrich",
""
]
] | We present a concise review of the theoretical status of rare K->pinunubar decays in and beyond the standard model. Particular attention is thereby devoted to the recent calculation of the next-to-next-to-leading order corrections to the charm quark contribution of K^+->pi^+nunubar which removes the last relevant theoretical uncertainty from the K->pinunubar system. |
1310.0222 | Martin Kr\v{s}\v{s}\'ak | Martin Krssak | Energy Momentum Tensor Correlators in Improved Holographic QCD | 107 pages, 14 figures, PhD thesis | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis, we study the physics of the quark gluon plasma (QGP) using
holographic methods borrowed from string theory. We start our discussion by
motivating the use of such machinery, explaining how recent experimental
results from the LHC and RHIC colliders suggests that the created QGP should be
described as a strongly coupled liquid with small but nonvanishing bulk and
shear viscosities. We argue that holographic dualities are a very efficient
framework for studying transport properties in such a medium.
Next, we introduce the underlying physics behind all holographic dualities,
the AdS/CFT correspondence, and then motivate the necessity of implementing
conformal invariance breaking in them. After this, we present the
phenomenologically most successful holographic model of the strong interactions
- Improved Holographic QCD (IHQCD).
Working within IHQCD, we next move on to calculate energy momentum tensor
correlators in the bulk and shear channels of large-Nc Yang-Mills theory. In
the shear channel, we confront our results with those derived in strongly
coupled N=4 Super Yang-Mills theory as well as weakly interacting ordinary
Yang-Mills theory. Close to the critical temperature of the deconfinement
transition, we observe significant effects of conformal invariance breaking. In
the bulk channel, where the conformal result is trivial, we make comparisons
with both perturbative and lattice QCD. We observe that lattice data seem to
favor our holographic prediction over the perturbative one over a wide range of
temperatures.
| [
{
"created": "Tue, 1 Oct 2013 10:16:24 GMT",
"version": "v1"
}
] | 2013-10-02 | [
[
"Krssak",
"Martin",
""
]
] | In this thesis, we study the physics of the quark gluon plasma (QGP) using holographic methods borrowed from string theory. We start our discussion by motivating the use of such machinery, explaining how recent experimental results from the LHC and RHIC colliders suggests that the created QGP should be described as a strongly coupled liquid with small but nonvanishing bulk and shear viscosities. We argue that holographic dualities are a very efficient framework for studying transport properties in such a medium. Next, we introduce the underlying physics behind all holographic dualities, the AdS/CFT correspondence, and then motivate the necessity of implementing conformal invariance breaking in them. After this, we present the phenomenologically most successful holographic model of the strong interactions - Improved Holographic QCD (IHQCD). Working within IHQCD, we next move on to calculate energy momentum tensor correlators in the bulk and shear channels of large-Nc Yang-Mills theory. In the shear channel, we confront our results with those derived in strongly coupled N=4 Super Yang-Mills theory as well as weakly interacting ordinary Yang-Mills theory. Close to the critical temperature of the deconfinement transition, we observe significant effects of conformal invariance breaking. In the bulk channel, where the conformal result is trivial, we make comparisons with both perturbative and lattice QCD. We observe that lattice data seem to favor our holographic prediction over the perturbative one over a wide range of temperatures. |
2212.00978 | Roman Nikolaevich Lee | Petr A. Krachkov and Roman N. Lee | Charge asymmetry in the spectra of bremsstrahlung and pair production | 14 pages, 8 figures | null | 10.1007/JHEP02(2023)033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the first Coulomb correction to the spectra of two processes:
the electron bremsstrahlung and electron-positron photoproduction in the
Coulomb field. We show that, in contrast to the results obtained in the Born
approximation and in the high-energy limit, the obtained corrections for these
two process are not related by the crossing symmetry substitutions. The found
corrections determine the leading contribution to the charge asymmetry in these
processes. We use modern multiloop methods based on the IBP reduction and on
the differential equations for master integrals. The results are presented in
terms of classical polylogarithms. We provide both the threshold and the
high-energy asymptotics of the obtained expressions and compare them with
available results.
| [
{
"created": "Fri, 2 Dec 2022 05:15:15 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Krachkov",
"Petr A.",
""
],
[
"Lee",
"Roman N.",
""
]
] | We calculate the first Coulomb correction to the spectra of two processes: the electron bremsstrahlung and electron-positron photoproduction in the Coulomb field. We show that, in contrast to the results obtained in the Born approximation and in the high-energy limit, the obtained corrections for these two process are not related by the crossing symmetry substitutions. The found corrections determine the leading contribution to the charge asymmetry in these processes. We use modern multiloop methods based on the IBP reduction and on the differential equations for master integrals. The results are presented in terms of classical polylogarithms. We provide both the threshold and the high-energy asymptotics of the obtained expressions and compare them with available results. |
2001.03677 | Sally Robertson | Spencer R. Klein, Sally A. Robertson, Ramona Vogt | Nuclear effects in high-energy neutrino interactions | null | Phys. Rev. C 102, 015808 (2020) | 10.1103/PhysRevC.102.015808 | null | hep-ph astro-ph.HE nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino telescopes like IceCube, KM3NeT and Baikal-GVD offer physicists the
opportunity to study neutrinos with energies far beyond the reach of
terrestrial accelerators. These neutrinos are used to study high-energy
neutrino interactions and to probe the Earth through absorption tomography.
Current studies of TeV neutrinos use cross sections which are calculated for
free nucleons with targets which are assumed to contain equal numbers of
protons and neutrons.
Here we consider modifications of high-energy neutrino interactions due to
two nuclear effects: modifications of the parton densities in the nucleus,
referred to here as shadowing, and the effect of non-isoscalar targets, with
unequal numbers of neutrons and protons. Both these effects depend on the
interaction medium. Because shadowing is larger for heavier nuclei, such as
iron, found in the Earth's core, it introduces a zenith-angle dependent change
in the absorption cross section. These modifications increase the cross
sections by 1-2\% at energies below 100 TeV (antishadowing), and reduce it by
3-4\% at higher energies (shadowing).
Nuclear effects also alter the inelasticity distribution of neutrino
interactions in water/ice by increasing the number of low inelasticity
interactions, with a larger effect for $\nu$ than $\bar\nu$. These effects are
particularly large in the energy range below a few TeV. These effects could
alter the cross sections inferred from events with tracks originating within
the active detector volume as well as the ratio $\nu/\bar\nu$ inferred from
inelasticity measurements.
The uncertainties in these nuclear effects are larger than the uncertainties
on the free-proton cross sections and will thus limit the systematic precision
of future high-precision measurements at neutrino telescopes.
| [
{
"created": "Fri, 10 Jan 2020 22:08:22 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2020 00:36:28 GMT",
"version": "v2"
}
] | 2020-08-05 | [
[
"Klein",
"Spencer R.",
""
],
[
"Robertson",
"Sally A.",
""
],
[
"Vogt",
"Ramona",
""
]
] | Neutrino telescopes like IceCube, KM3NeT and Baikal-GVD offer physicists the opportunity to study neutrinos with energies far beyond the reach of terrestrial accelerators. These neutrinos are used to study high-energy neutrino interactions and to probe the Earth through absorption tomography. Current studies of TeV neutrinos use cross sections which are calculated for free nucleons with targets which are assumed to contain equal numbers of protons and neutrons. Here we consider modifications of high-energy neutrino interactions due to two nuclear effects: modifications of the parton densities in the nucleus, referred to here as shadowing, and the effect of non-isoscalar targets, with unequal numbers of neutrons and protons. Both these effects depend on the interaction medium. Because shadowing is larger for heavier nuclei, such as iron, found in the Earth's core, it introduces a zenith-angle dependent change in the absorption cross section. These modifications increase the cross sections by 1-2\% at energies below 100 TeV (antishadowing), and reduce it by 3-4\% at higher energies (shadowing). Nuclear effects also alter the inelasticity distribution of neutrino interactions in water/ice by increasing the number of low inelasticity interactions, with a larger effect for $\nu$ than $\bar\nu$. These effects are particularly large in the energy range below a few TeV. These effects could alter the cross sections inferred from events with tracks originating within the active detector volume as well as the ratio $\nu/\bar\nu$ inferred from inelasticity measurements. The uncertainties in these nuclear effects are larger than the uncertainties on the free-proton cross sections and will thus limit the systematic precision of future high-precision measurements at neutrino telescopes. |
1606.06686 | Hiroyuki Ishida | Takehiko Asaka, Shintaro Eijima, and Hiroyuki Ishida | On neutrinoless double beta decay in the $\nu$MSM | 10 pages, 6 figures, v2: published version to appear in Physics
Letters B | null | 10.1016/j.physletb.2016.09.044 | SU-HET-05-2016 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the neutrinoless double beta ($0\nu \beta \beta$) decay in the
so-called $\nu$MSM, in which three right-handed neutrinos with masses below the
electroweak scale are additionally introduced to the Standard Model. In this
model there appear three heavy neutral leptons $N_1$, $N_2$, and $N_3$
corresponding to right-handed neutrinos. It has been known that the lightest
one $N_1$ with keV mass, which is a candidate for dark matter, gives a
negligible contribution to the $0 \nu \beta \beta$ decay. By contrast, the
heavier ones $N_2$ and $N_3$, which are responsible to the seesaw mechanism of
neutrino masses and baryogenesis, give the destructive contribution (compared
with one from active neutrinos). This is because their mass degeneracy at high
precision has been assumed, which is expected by analytical studies of
baryogengesis. In this analysis, we find that the effective mass of the $0\nu
\beta \beta$ decay becomes larger than one from active neutrinos due to the
$N_2$ and $N_3$ constructive contribution when the mass difference becomes
larger and the mass ordering of active neutrinos is inverted. Such a
possibility will be explored by the current and near future experiments of the
$0 \nu \beta \beta$ decay.
| [
{
"created": "Tue, 21 Jun 2016 18:04:09 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2016 05:58:33 GMT",
"version": "v2"
}
] | 2016-11-16 | [
[
"Asaka",
"Takehiko",
""
],
[
"Eijima",
"Shintaro",
""
],
[
"Ishida",
"Hiroyuki",
""
]
] | We consider the neutrinoless double beta ($0\nu \beta \beta$) decay in the so-called $\nu$MSM, in which three right-handed neutrinos with masses below the electroweak scale are additionally introduced to the Standard Model. In this model there appear three heavy neutral leptons $N_1$, $N_2$, and $N_3$ corresponding to right-handed neutrinos. It has been known that the lightest one $N_1$ with keV mass, which is a candidate for dark matter, gives a negligible contribution to the $0 \nu \beta \beta$ decay. By contrast, the heavier ones $N_2$ and $N_3$, which are responsible to the seesaw mechanism of neutrino masses and baryogenesis, give the destructive contribution (compared with one from active neutrinos). This is because their mass degeneracy at high precision has been assumed, which is expected by analytical studies of baryogengesis. In this analysis, we find that the effective mass of the $0\nu \beta \beta$ decay becomes larger than one from active neutrinos due to the $N_2$ and $N_3$ constructive contribution when the mass difference becomes larger and the mass ordering of active neutrinos is inverted. Such a possibility will be explored by the current and near future experiments of the $0 \nu \beta \beta$ decay. |
hep-ph/9905271 | null | F. Gangemi, G. Montagna, M. Moretti, O. Nicrosini and F. Piccinini | Top-quark physics in six-quark final states at the Next Linear Collider | LaTeX (using elsart.sty), 17 pages, 9 figures included | Nucl.Phys. B559 (1999) 3-16 | 10.1016/S0550-3213(99)00450-2 | CERN/TH 99-125, FNT/T 99/08 | hep-ph | null | The processes of six-quark production with one $b\bar b$ pair are studied by
means of a complete tree-level electroweak calculation. The top-quark signal is
examined: the importance of electroweak backgrounds, of the order of 10% above
the $t\bar t$ threshold and of about 30% of the purely electroweak signal at
threshold, is further stressed by studying the dependence of the cross-section
at threshold on the Higgs mass in the range between 100 GeV and 185 GeV, and
finding variations of the order of 10%. In the study of some event-shape
variables, a strong effect of initial-state radiation is found, in particular
for the thrust distribution, which is studied for several centre-of-mass
energies at the TeV scale. The effectiveness of cuts on the thrust for
isolating QCD backgrounds, as pointed out by some authors, is confirmed also in
the presence of electroweak backgrounds and initial-state radiation.
| [
{
"created": "Fri, 7 May 1999 16:00:30 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gangemi",
"F.",
""
],
[
"Montagna",
"G.",
""
],
[
"Moretti",
"M.",
""
],
[
"Nicrosini",
"O.",
""
],
[
"Piccinini",
"F.",
""
]
] | The processes of six-quark production with one $b\bar b$ pair are studied by means of a complete tree-level electroweak calculation. The top-quark signal is examined: the importance of electroweak backgrounds, of the order of 10% above the $t\bar t$ threshold and of about 30% of the purely electroweak signal at threshold, is further stressed by studying the dependence of the cross-section at threshold on the Higgs mass in the range between 100 GeV and 185 GeV, and finding variations of the order of 10%. In the study of some event-shape variables, a strong effect of initial-state radiation is found, in particular for the thrust distribution, which is studied for several centre-of-mass energies at the TeV scale. The effectiveness of cuts on the thrust for isolating QCD backgrounds, as pointed out by some authors, is confirmed also in the presence of electroweak backgrounds and initial-state radiation. |
hep-ph/0102061 | Erhan Iltan | E. O. Iltan (ODTU, Ankara) | B --> K l^+ l^- decay in the general two Higgs doublet model | 13 pages, 1 Table, 8 figures | Eur.Phys.J.direct C4 (2002) 8 | null | null | hep-ph | null | We study the branching ratio, CP-violating asymmetry, forward-backward
asymmetry and the CP-violating asymmetry in the forward-backward asymmetry for
the exclusive decay B--> K l^+ l^-$ in the two Higgs doublet model with tree
level flavor changing neutral currents (model III). We analyse the dependencies
of these quantities on the neutral Higgs boson contributions and the CP
parameter sin\theta in the model III. We observe that to determine the neutral
Higgs boson effects, the measurements of the forward-backward asymmetry and the
CP-violating asymmetry in the forward-backward asymmetry for the decay B--> K
l^+ l^- are promising.
| [
{
"created": "Tue, 6 Feb 2001 12:07:45 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2002 19:46:37 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Iltan",
"E. O.",
"",
"ODTU, Ankara"
]
] | We study the branching ratio, CP-violating asymmetry, forward-backward asymmetry and the CP-violating asymmetry in the forward-backward asymmetry for the exclusive decay B--> K l^+ l^-$ in the two Higgs doublet model with tree level flavor changing neutral currents (model III). We analyse the dependencies of these quantities on the neutral Higgs boson contributions and the CP parameter sin\theta in the model III. We observe that to determine the neutral Higgs boson effects, the measurements of the forward-backward asymmetry and the CP-violating asymmetry in the forward-backward asymmetry for the decay B--> K l^+ l^- are promising. |
2005.00204 | Xin-Li Sheng | Xin-Li Sheng, Qun Wang, Xu-Guang Huang | Kinetic theory with spin: From massive to massless fermions | 12 pages, no figure | Phys. Rev. D 102, 025019 (2020) | 10.1103/PhysRevD.102.025019 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find that the recently developed kinetic theories with spin for massive
and massless fermions are smoothly connected. By introducing a reference-frame
vector, we decompose the dipole-moment tensor into electric and magnetic dipole
moments. We show that the axial-vector component of the Wigner function
contains a contribution from the transverse magnetic dipole moment which
accounts for the transverse spin degree of freedom (DOF) and vanishes smoothly
in the massless limit. As a result, the kinetic equations, describing four DOF
for massive fermions, becomes smoothly the chiral kinetic equations describing
two DOF in the massless limit. We also confirm the small-mass behavior of the
Wigner function by explicit calculation using a Gaussian wave packet.
| [
{
"created": "Fri, 1 May 2020 04:00:05 GMT",
"version": "v1"
}
] | 2020-07-29 | [
[
"Sheng",
"Xin-Li",
""
],
[
"Wang",
"Qun",
""
],
[
"Huang",
"Xu-Guang",
""
]
] | We find that the recently developed kinetic theories with spin for massive and massless fermions are smoothly connected. By introducing a reference-frame vector, we decompose the dipole-moment tensor into electric and magnetic dipole moments. We show that the axial-vector component of the Wigner function contains a contribution from the transverse magnetic dipole moment which accounts for the transverse spin degree of freedom (DOF) and vanishes smoothly in the massless limit. As a result, the kinetic equations, describing four DOF for massive fermions, becomes smoothly the chiral kinetic equations describing two DOF in the massless limit. We also confirm the small-mass behavior of the Wigner function by explicit calculation using a Gaussian wave packet. |
hep-ph/0406112 | Brigitte Hiller | A.A. Osipov, H. Hansen, and B. Hiller | Long distance expansion for the NJL model with SU(3) and U_A(1) breaking | LaTeX, 30 pages, added discussions and references, title change,
version to appear in Nucl. Phys. A | Nucl.Phys. A745 (2004) 81-103 | 10.1016/j.nuclphysa.2004.08.022 | null | hep-ph | null | This work is a follow up of recent investigations, where we study the
implications of a generalized heat kernel expansion, constructed to incorporate
non-perturbatively the effects of a non-commutative quark mass matrix in a
fully covariant way at each order of the expansion. As underlying Lagrangian we
use the Nambu -- Jona-Lasinio model of QCD, with $SU_f(3)$ and $U_A(1)$
breaking, the latter generated by the 't Hooft flavour determinant interaction.
The associated bosonized Lagrangian is derived in leading stationary phase
approximation (SPA) and up to second order in the generalized heat kernel
expansion. Its symmetry breaking pattern is shown to have a complex structure,
involving all powers of the mesonic fields allowed by symmetry. The considered
Lagrangian yields a reliable playground for the study of the implications of
symmetry and vacuum structure on the mesonic spectra, which we evaluate for the
scalar and pseudoscalar meson nonets and compare with other approaches and
experiment.
| [
{
"created": "Wed, 9 Jun 2004 17:11:51 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 2004 14:00:09 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Osipov",
"A. A.",
""
],
[
"Hansen",
"H.",
""
],
[
"Hiller",
"B.",
""
]
] | This work is a follow up of recent investigations, where we study the implications of a generalized heat kernel expansion, constructed to incorporate non-perturbatively the effects of a non-commutative quark mass matrix in a fully covariant way at each order of the expansion. As underlying Lagrangian we use the Nambu -- Jona-Lasinio model of QCD, with $SU_f(3)$ and $U_A(1)$ breaking, the latter generated by the 't Hooft flavour determinant interaction. The associated bosonized Lagrangian is derived in leading stationary phase approximation (SPA) and up to second order in the generalized heat kernel expansion. Its symmetry breaking pattern is shown to have a complex structure, involving all powers of the mesonic fields allowed by symmetry. The considered Lagrangian yields a reliable playground for the study of the implications of symmetry and vacuum structure on the mesonic spectra, which we evaluate for the scalar and pseudoscalar meson nonets and compare with other approaches and experiment. |
1301.4214 | German Valencia | German Valencia | Probing new physics with tau-leptons at the LHC | Prepared for TAU2012 | null | 10.1016/j.nuclphysbps.2014.09.043 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss new physics that can show up in the $\tau^+\tau^-$ production
process at the LHC but not in the dimuon or the dielectron channels. We
consider three different generic possibilities: a new resonance in the
Drell-Yan process in the form of a non-universal $Z^\prime$; a new non-resonant
contribution to $q\bar{q}\to \tau^+\tau^-$ in the form of leptoquarks; and
contributions from gluon fusion due to effective lepton gluonic couplings. We
emphasize the use of the charge asymmetry both to discover new physics and to
distinguish between different possibilities
| [
{
"created": "Thu, 17 Jan 2013 20:49:12 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Valencia",
"German",
""
]
] | We discuss new physics that can show up in the $\tau^+\tau^-$ production process at the LHC but not in the dimuon or the dielectron channels. We consider three different generic possibilities: a new resonance in the Drell-Yan process in the form of a non-universal $Z^\prime$; a new non-resonant contribution to $q\bar{q}\to \tau^+\tau^-$ in the form of leptoquarks; and contributions from gluon fusion due to effective lepton gluonic couplings. We emphasize the use of the charge asymmetry both to discover new physics and to distinguish between different possibilities |
hep-ph/9308329 | Benjamin Grinstein | Alon E. Faraggi and Benjamin Grinstein | Light Threshold Effects in Supersymmetric Grand Unified Theories | 33 pages (13 revised figures available by anonymous ftp), two new
sections, some improvements, SSCL--Preprint--496 and WIS--93/61/JULY--PH | Nucl.Phys.B422:3-36,1994 | 10.1016/0550-3213(94)00101-4 | null | hep-ph | null | Supersymmetric Grand Unified Theories have a rich spectrum of particles
barely heavier than the intermediate vector bosons. As their non-supersymmetric
counterparts, they lead to many relations among low energy observables. But the
precise form of the predictions is modified by the extended spectrum. If the
masses of these new particles are comparable to $M_Z$, the standard computation
of their effect becomes inaccurate. We present a detail discussion of the
correct procedure, and carry out the relevant computations to one loop order.
The procedure we propose has the advantage over other existing methods that
two-loop running of gauge couplings can be incorporated readily and
consistently. Attention is paid to the special treatment that the top and Higgs
particles must receive. The size of the effect is explored for a range of
parameters in the minimal supersymmetric $SU(5)$ grand-unified theory with
radiative breaking. It is found that the naive (leading-log) computation can be
fairly inaccurate.
| [
{
"created": "Tue, 24 Aug 1993 16:29:10 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 1993 19:54:53 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Dec 1993 00:42:09 GMT",
"version": "v3"
}
] | 2011-03-10 | [
[
"Faraggi",
"Alon E.",
""
],
[
"Grinstein",
"Benjamin",
""
]
] | Supersymmetric Grand Unified Theories have a rich spectrum of particles barely heavier than the intermediate vector bosons. As their non-supersymmetric counterparts, they lead to many relations among low energy observables. But the precise form of the predictions is modified by the extended spectrum. If the masses of these new particles are comparable to $M_Z$, the standard computation of their effect becomes inaccurate. We present a detail discussion of the correct procedure, and carry out the relevant computations to one loop order. The procedure we propose has the advantage over other existing methods that two-loop running of gauge couplings can be incorporated readily and consistently. Attention is paid to the special treatment that the top and Higgs particles must receive. The size of the effect is explored for a range of parameters in the minimal supersymmetric $SU(5)$ grand-unified theory with radiative breaking. It is found that the naive (leading-log) computation can be fairly inaccurate. |
1309.0721 | Wim de Boer | W. de Boer (for the CMS Collaboration, IEKP, Karlsruhe Institute of
Technology, Germany) | The Discovery of the Higgs Boson with the CMS Detector and its
Implications for Supersymmetry and Cosmology | 26 pages, Conference Proceedings Time and Matter (TAM2013), Venice,
Feb. 2013 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of the long awaited Higgs boson is described using data from
the CMS detector at the LHC. In the SM the masses of fermions and the heavy
gauge bosons are generated by the interactions with the Higgs field, so all
couplings are related to the observed masses. Indeed, all observed couplings
are consistent with the predictions from the Higgs mechanism, both to vector
bosons and fermions implying that masses are indeed consistent of being
generated by the interactions with the Higgs field. However, on a cosmological
scale the mass of the universe seems not to be related to the Higgs field: the
baryonic mass originates from the binding energy of the quarks inside the
nuclei and dark matter is not even predicted in the SM, so the origin of its
mass is unknown. The dominant energy component in the universe, the dark
energy, yields an accelerated expansion of the universe, so its repulsive
gravity most likely originates from a kind of vacuum energy. The Higgs field
would be the prime candidate for this, if the energy density would not be many
orders of magnitude too high, as will be calculated. The Higgs mass is found to
be 125.7$\pm$0.3(stat.)$\pm$0.3(syst.) GeV, which is below 130 GeV, i.e. in the
range predicted by supersymmetry. This may be the strongest hint for
supersymmetry in spite of the fact that the predicted supersymmetric particles
have not been discovered so far.
| [
{
"created": "Tue, 3 Sep 2013 15:23:33 GMT",
"version": "v1"
}
] | 2013-09-04 | [
[
"de Boer",
"W.",
"",
"for the CMS Collaboration, IEKP, Karlsruhe Institute of\n Technology, Germany"
]
] | The discovery of the long awaited Higgs boson is described using data from the CMS detector at the LHC. In the SM the masses of fermions and the heavy gauge bosons are generated by the interactions with the Higgs field, so all couplings are related to the observed masses. Indeed, all observed couplings are consistent with the predictions from the Higgs mechanism, both to vector bosons and fermions implying that masses are indeed consistent of being generated by the interactions with the Higgs field. However, on a cosmological scale the mass of the universe seems not to be related to the Higgs field: the baryonic mass originates from the binding energy of the quarks inside the nuclei and dark matter is not even predicted in the SM, so the origin of its mass is unknown. The dominant energy component in the universe, the dark energy, yields an accelerated expansion of the universe, so its repulsive gravity most likely originates from a kind of vacuum energy. The Higgs field would be the prime candidate for this, if the energy density would not be many orders of magnitude too high, as will be calculated. The Higgs mass is found to be 125.7$\pm$0.3(stat.)$\pm$0.3(syst.) GeV, which is below 130 GeV, i.e. in the range predicted by supersymmetry. This may be the strongest hint for supersymmetry in spite of the fact that the predicted supersymmetric particles have not been discovered so far. |
2203.12871 | Ijaz Ahmed | Ijaz Ahmed, Anwar Zada, Muhammad Waqas, M. U. Ashraf | Application of deep learning in top pair and single top quark production
at the LHC | 21 pages, 4 tables, 19 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate the performance of a very efficient tagger applies on
hadronically decaying top quark pairs as signal based on deep neural network
algorithms and compares with the QCD multi-jet background events. A significant
enhancement of performance in boosted top quark events is observed with our
limited computing resources. We also compare modern machine learning approaches
and perform a multivariate analysis of boosted top-pair as well as single top
quark production through weak interaction at $\sqrt{s}=$14 TeV proton-proton
Collider. The most relevant known background processes are incorporated.
Through the techniques of Boosted Decision Tree (BDT), likelihood and Multlayer
Perceptron (MLP) the analysis is trained to observe the performance in
comparison with the conventional cut based and count approach.
| [
{
"created": "Thu, 24 Mar 2022 06:26:10 GMT",
"version": "v1"
}
] | 2022-03-25 | [
[
"Ahmed",
"Ijaz",
""
],
[
"Zada",
"Anwar",
""
],
[
"Waqas",
"Muhammad",
""
],
[
"Ashraf",
"M. U.",
""
]
] | We demonstrate the performance of a very efficient tagger applies on hadronically decaying top quark pairs as signal based on deep neural network algorithms and compares with the QCD multi-jet background events. A significant enhancement of performance in boosted top quark events is observed with our limited computing resources. We also compare modern machine learning approaches and perform a multivariate analysis of boosted top-pair as well as single top quark production through weak interaction at $\sqrt{s}=$14 TeV proton-proton Collider. The most relevant known background processes are incorporated. Through the techniques of Boosted Decision Tree (BDT), likelihood and Multlayer Perceptron (MLP) the analysis is trained to observe the performance in comparison with the conventional cut based and count approach. |
1106.0340 | Arie Bodek | A. Bodek, H. S. Budd and E. Christy | Neutrino Quasielastic Scattering on Nuclear Targets: Parametrizing
Transverse Enhancement (Meson Exchange Currents) | Revised Version- July 21, 2011: 17 pages, 20 Figures. To be published
in Eur. Phys. J. C | Eur. Phys. J. C 71 (2011) 1726 | 10.1140/epjc/s10052-011-1726-y | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a parametrization of the observed enhancement in the transverse
electron quasielastic (QE) response function for nucleons bound in carbon as a
function of the square of the four momentum transfer ($Q^2$) in terms of a
correction to the magnetic form factors of bound nucleons. The parametrization
should also be applicable to the transverse cross section in neutrino
scattering. If the transverse enhancement originates from meson exchange
currents (MEC), then it is theoretically expected that any enhancement in the
longitudinal or axial contributions is small. We present the predictions of the
"Transverse Enhancement" model (which is based on electron scattering data
only) for the $\nu_\mu, \bar{\nu}_\mu$ differential and total QE cross sections
for nucleons bound in carbon. The $Q^2$ dependence of the transverse
enhancement is observed to resolve much of the long standing discrepancy in the
QE total cross sections and differential distributions between low energy and
high energy neutrino experiments on nuclear targets.
| [
{
"created": "Wed, 1 Jun 2011 23:44:54 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jul 2011 14:43:21 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jul 2011 19:50:56 GMT",
"version": "v3"
}
] | 2011-09-07 | [
[
"Bodek",
"A.",
""
],
[
"Budd",
"H. S.",
""
],
[
"Christy",
"E.",
""
]
] | We present a parametrization of the observed enhancement in the transverse electron quasielastic (QE) response function for nucleons bound in carbon as a function of the square of the four momentum transfer ($Q^2$) in terms of a correction to the magnetic form factors of bound nucleons. The parametrization should also be applicable to the transverse cross section in neutrino scattering. If the transverse enhancement originates from meson exchange currents (MEC), then it is theoretically expected that any enhancement in the longitudinal or axial contributions is small. We present the predictions of the "Transverse Enhancement" model (which is based on electron scattering data only) for the $\nu_\mu, \bar{\nu}_\mu$ differential and total QE cross sections for nucleons bound in carbon. The $Q^2$ dependence of the transverse enhancement is observed to resolve much of the long standing discrepancy in the QE total cross sections and differential distributions between low energy and high energy neutrino experiments on nuclear targets. |
1610.03711 | Jarkko Peuron | Tuomas Lappi, Jarkko Peuron | Plasmon mass scale in classical nonequilibrium gauge theory | 9 pages, 10 figures, to appear in Phys. Rev. D | Phys. Rev. D 95, 014025 (2017) | 10.1103/PhysRevD.95.014025 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Classical lattice Yang-Mills calculations provide a good way to understand
different nonequilibrium phenomena in nonperturbatively overoccupied systems.
Above the Debye scale the classical theory can be matched smoothly to kinetic
theory. The aim of this work is to study the limits of this quasiparticle
picture by determining the plasmon mass in classical real time Yang-Mills
theory on a lattice in 3 spatial dimensions. We compare three methods to
determine the plasmon mass: a hard thermal loop expression in terms of the
particle distribution, an effective dispersion relation constructed from fields
and their time derivatives, and by measuring oscillations between electric and
magnetic field modes after artificially introducing a homogeneous color
electric field. We find that a version of the dispersion relation that uses
electric fields and their time derivatives agrees with the other methods within
50%.
| [
{
"created": "Wed, 12 Oct 2016 13:50:17 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2017 13:13:08 GMT",
"version": "v2"
}
] | 2017-02-01 | [
[
"Lappi",
"Tuomas",
""
],
[
"Peuron",
"Jarkko",
""
]
] | Classical lattice Yang-Mills calculations provide a good way to understand different nonequilibrium phenomena in nonperturbatively overoccupied systems. Above the Debye scale the classical theory can be matched smoothly to kinetic theory. The aim of this work is to study the limits of this quasiparticle picture by determining the plasmon mass in classical real time Yang-Mills theory on a lattice in 3 spatial dimensions. We compare three methods to determine the plasmon mass: a hard thermal loop expression in terms of the particle distribution, an effective dispersion relation constructed from fields and their time derivatives, and by measuring oscillations between electric and magnetic field modes after artificially introducing a homogeneous color electric field. We find that a version of the dispersion relation that uses electric fields and their time derivatives agrees with the other methods within 50%. |
1107.1269 | D.N. Triantafyllopoulos | D.N. Triantafyllopoulos | Forward and Mueller-Navelet Jets | 6 pages, 4 figures. To appear in the proceedings of Excited QCD 2011,
20-25 Feb 2011, Les Houches, France | Acta Physica Polonica B Proceedings Supplement vol. 4 (2011) page
549 | 10.5506/APhysPolBSupp.4.549 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the production of forward jets in high energy processes where one
probes a dense hadronic wavefunction. In particular, and as a signature of
parton saturation, we discuss the possibility of a strong momentum
decorrelation in Mueller-Navelet jets which leads to a geometric scaling
behavior.
| [
{
"created": "Wed, 6 Jul 2011 22:11:54 GMT",
"version": "v1"
}
] | 2011-10-24 | [
[
"Triantafyllopoulos",
"D. N.",
""
]
] | We discuss the production of forward jets in high energy processes where one probes a dense hadronic wavefunction. In particular, and as a signature of parton saturation, we discuss the possibility of a strong momentum decorrelation in Mueller-Navelet jets which leads to a geometric scaling behavior. |
hep-ph/0006219 | Victor Nikonov | V. A. Nikonov and J. Nyiri | Quark combinatorics for production ratios in hadronic Z^0 decays | 5 pages, LaTeX, 8 EPS figures, epsfig.sty | null | null | null | hep-ph | null | Model independent verification of the quark combinatorics rules, which govern
the ratios of the yields of secondaries, is presented for jet processes.
Because of a large number of produced resonances in the hadron jets, a test of
the quark combinatorics rules is hardly possible in the central region,
x_{hadron} < 0.2. However, a model-independent verification is plausible at
x_{hadron} \sim 1. It is shown that for the large x_{hadron} kinematical region
the quark combinatorial relations are in a reasonable agreement with data for
\rho^0/\pi^0 and p/\pi^+ ratios.
| [
{
"created": "Mon, 19 Jun 2000 12:30:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nikonov",
"V. A.",
""
],
[
"Nyiri",
"J.",
""
]
] | Model independent verification of the quark combinatorics rules, which govern the ratios of the yields of secondaries, is presented for jet processes. Because of a large number of produced resonances in the hadron jets, a test of the quark combinatorics rules is hardly possible in the central region, x_{hadron} < 0.2. However, a model-independent verification is plausible at x_{hadron} \sim 1. It is shown that for the large x_{hadron} kinematical region the quark combinatorial relations are in a reasonable agreement with data for \rho^0/\pi^0 and p/\pi^+ ratios. |
2203.15452 | Yong Tang | Qing-Yang Wang, Yong Tang, Yue-Liang Wu | Dark Matter Production in Weyl $R^2$ Inflation | 26 pages, 5 figures | Phys. Rev. D 106, 023502, 2022 | 10.1103/PhysRevD.106.023502 | null | hep-ph astro-ph.CO gr-qc | http://creativecommons.org/licenses/by/4.0/ | Dark matter and inflation are two key elements to understand the origin of
cosmic structures in modern cosmology, and yet their exact physical models
remain largely uncertain. The Weyl scaling invariant theory of gravity may
provide a feasible scheme to solve these two puzzles jointly, which contains a
massive gauge boson playing the role of dark matter candidate, and allows the
quadratic scalar curvature term, namely $R^2$, to realize a viable inflationary
mechanism in agreement with current observations. We ponder on the production
of dark matters in the Weyl $R^2$ model, including the contribution from the
non-perturbative production due to the quantum fluctuations from inflationary
vacuum and perturbative ones from scattering. We demonstrate that there are
generally three parameter ranges for viable dark matter production: (1) If the
reheating temperature is larger than $10^3~\mathrm{GeV}$, the Weyl gauge boson
as dark matter can be produced abundantly with mass larger than the inflation
scale $\sim 10^{13}~\mathrm{GeV}$. (2) Small mass region with
$3\times10^{-13}~\mathrm{GeV}$ for a higher reheating temperature. (3)
Annihilation channel becomes important in the case of higher reheating
temperature, which enables the Weyl gauge boson with mass up to
$4\times10^{16}~\mathrm{GeV}$ to be produced through freeze-in.
| [
{
"created": "Tue, 29 Mar 2022 11:51:24 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jul 2022 02:50:03 GMT",
"version": "v2"
}
] | 2022-07-08 | [
[
"Wang",
"Qing-Yang",
""
],
[
"Tang",
"Yong",
""
],
[
"Wu",
"Yue-Liang",
""
]
] | Dark matter and inflation are two key elements to understand the origin of cosmic structures in modern cosmology, and yet their exact physical models remain largely uncertain. The Weyl scaling invariant theory of gravity may provide a feasible scheme to solve these two puzzles jointly, which contains a massive gauge boson playing the role of dark matter candidate, and allows the quadratic scalar curvature term, namely $R^2$, to realize a viable inflationary mechanism in agreement with current observations. We ponder on the production of dark matters in the Weyl $R^2$ model, including the contribution from the non-perturbative production due to the quantum fluctuations from inflationary vacuum and perturbative ones from scattering. We demonstrate that there are generally three parameter ranges for viable dark matter production: (1) If the reheating temperature is larger than $10^3~\mathrm{GeV}$, the Weyl gauge boson as dark matter can be produced abundantly with mass larger than the inflation scale $\sim 10^{13}~\mathrm{GeV}$. (2) Small mass region with $3\times10^{-13}~\mathrm{GeV}$ for a higher reheating temperature. (3) Annihilation channel becomes important in the case of higher reheating temperature, which enables the Weyl gauge boson with mass up to $4\times10^{16}~\mathrm{GeV}$ to be produced through freeze-in. |
1311.5085 | Max Zoller | M. F. Zoller | Beta-function for the Higgs self-interaction in the Standard Model at
three-loop level | contribution to the proceedings of the European Physical Society
Conference on High Energy Physics, 2013 | PoS EPS-HEP2013 (2013) 322 | null | TTP13-040, SFB/CPP-13-103 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of a Higgs particle has triggered numerous theoretical and
experimental investigations concerning its production and decay rates and has
led to interesting results concerning its interaction with fermions and gauge
bosons. The self-interaction $\lambda$ of the Standard Model Higgs boson is
particularly important due to its close connection with the stability of the SM
vacuum. In this talk precision calculations for the evolution of this crucial
coupling are presented and their impact on the question of vacuum stability is
analysed. We also compare the theoretical precision resulting from the
calculation of three-loop $\beta$-functions to the experimental uncertainties
stemming from key parameters, such as the top mass, the Higgs mass and the
strong coupling, and to the theoretical uncertainties introduced by the
matching of experimental data to parameters in the theoretically favoured
$\overline{\text{MS}}$ renormalization scheme.
| [
{
"created": "Wed, 20 Nov 2013 15:03:57 GMT",
"version": "v1"
}
] | 2017-07-25 | [
[
"Zoller",
"M. F.",
""
]
] | The discovery of a Higgs particle has triggered numerous theoretical and experimental investigations concerning its production and decay rates and has led to interesting results concerning its interaction with fermions and gauge bosons. The self-interaction $\lambda$ of the Standard Model Higgs boson is particularly important due to its close connection with the stability of the SM vacuum. In this talk precision calculations for the evolution of this crucial coupling are presented and their impact on the question of vacuum stability is analysed. We also compare the theoretical precision resulting from the calculation of three-loop $\beta$-functions to the experimental uncertainties stemming from key parameters, such as the top mass, the Higgs mass and the strong coupling, and to the theoretical uncertainties introduced by the matching of experimental data to parameters in the theoretically favoured $\overline{\text{MS}}$ renormalization scheme. |
hep-ph/9608421 | M. Bisset | Mike Bisset, Dilip Kumar Ghosh and Sreerup Raychaudhuri | Combined Squark and Gluino Mass Bounds from LEP Data | 13 page RevTeX file, 1 figure, uses epsf.sty; minor corrections made
and references updated | null | null | TIFR/TH/96-05, BU-TH/96-4 | hep-ph | null | Under the assumption of gaugino mass unification at a high scale, chargino
and neutralino masses depend on the value of the gluino mass, which itself
becomes a function of squark masses through self-energy corrections. We
demonstrate that this leads to combined bounds on squark and gluino masses from
the limits on chargino, neutralino and Higgs boson masses obtained in the CERN
LEP-1 and LEP-1.5 runs. These bounds turn out to be comparable to those
obtained from direct searches at the Fermilab Tevatron and may be expected to
improve as LEP energies go higher.
| [
{
"created": "Fri, 23 Aug 1996 15:10:56 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Aug 1996 00:48:04 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Bisset",
"Mike",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Raychaudhuri",
"Sreerup",
""
]
] | Under the assumption of gaugino mass unification at a high scale, chargino and neutralino masses depend on the value of the gluino mass, which itself becomes a function of squark masses through self-energy corrections. We demonstrate that this leads to combined bounds on squark and gluino masses from the limits on chargino, neutralino and Higgs boson masses obtained in the CERN LEP-1 and LEP-1.5 runs. These bounds turn out to be comparable to those obtained from direct searches at the Fermilab Tevatron and may be expected to improve as LEP energies go higher. |
hep-ph/0512106 | Mikhail Gorshteyn | Mikhail Gorchtein | Doubly virtual Compton scattering and the beam normal spin asymmetry | 13 pages, 2 figures, revtex, submitted to Phys. Rev. C; new version:
two figures added, typos corrected | Phys.Rev.C73:035213,2006 | 10.1103/PhysRevC.73.035213 | null | hep-ph nucl-th | null | We construct an invariant basis for Compton scattering with two virtual
photons (VVCS). The basis tensors are chosen to be gauge invariant and
orthogonal to each other. The properties of the corresponding 18 invariant
amplitudes are studied in detail. We consider the special case of elastic VVCS
with the virtualities of the initial and final photons equal. The invariant
basis for VVCS in this orthogonal form does not exist in the literatur. We
furthermore use this VVCS tensor for a calculation of the beam normal spin
asymmetry in the forward kinematics. For this, we relate the invariant
amplitudes to the helicity amplitudes of the VVCS reaction. The imaginary parts
of these latter are related to the inclusive cross section by means of the
optical theorem. We use the phenomenological value of the transverse cross
section $\sigma_T\sim0.1$ mbarn and the Callan-Gross relation which relates the
longitudinal cross section $\sigma_L$ to the transverse one. The result of the
calculation agrees with an existing calculation and predicts the negative
values of the asymmetry $B_n$ of the order of 4-6 ppm in the energy range from
6 to 45 ppm and for very forward angles.
| [
{
"created": "Thu, 8 Dec 2005 20:30:59 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2005 19:08:18 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Jan 2006 23:07:50 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Gorchtein",
"Mikhail",
""
]
] | We construct an invariant basis for Compton scattering with two virtual photons (VVCS). The basis tensors are chosen to be gauge invariant and orthogonal to each other. The properties of the corresponding 18 invariant amplitudes are studied in detail. We consider the special case of elastic VVCS with the virtualities of the initial and final photons equal. The invariant basis for VVCS in this orthogonal form does not exist in the literatur. We furthermore use this VVCS tensor for a calculation of the beam normal spin asymmetry in the forward kinematics. For this, we relate the invariant amplitudes to the helicity amplitudes of the VVCS reaction. The imaginary parts of these latter are related to the inclusive cross section by means of the optical theorem. We use the phenomenological value of the transverse cross section $\sigma_T\sim0.1$ mbarn and the Callan-Gross relation which relates the longitudinal cross section $\sigma_L$ to the transverse one. The result of the calculation agrees with an existing calculation and predicts the negative values of the asymmetry $B_n$ of the order of 4-6 ppm in the energy range from 6 to 45 ppm and for very forward angles. |
2401.06716 | Loris Del Grosso | Loris Del Grosso, Paolo Pani, Alfredo Urbano | Compact objects in and beyond the Standard Model from non-perturbative
vacuum scalarization | 12 pages, 6 figures. v2: matches version accepted in PRD | Phys. Rev. D 109, 095006 (2024) | 10.1103/PhysRevD.109.095006 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a theory in which a real scalar field is Yukawa-coupled to a
fermion and has a potential with two non-degenerate vacua. If the coupling is
sufficiently strong, a collection of N fermions deforms the true vacuum state,
creating energetically-favored false-vacuum pockets in which fermions are
trapped. We embed this model within General Relativity and prove that it admits
self-gravitating compact objects where the scalar field acquires a non-trivial
profile due to non-perturbative effects. We discuss some applications of this
general mechanism: i) neutron soliton stars in low-energy effective QCD, which
naturally happen to have masses around 2 solar masses and radii around 10 km
even without neutron interactions; ii) Higgs false-vacuum pockets in and beyond
the Standard Model; iii) dark soliton stars in models with a dark sector. In
the latter two examples, we find compelling solutions naturally describing
centimeter-size compact objects with masses around 10^-6 solar masses,
intriguingly in a range compatible with the OGLE+HSC microlensing anomaly.
Besides these interesting examples, the mechanism of non-perturbative vacuum
scalarization may play a role in various contexts in and beyond the Standard
Model, providing a support mechanism for new compact objects that can form in
the early universe, can collapse into primordial black holes through accretion
past their maximum mass, and serve as dark matter candidates.
| [
{
"created": "Fri, 12 Jan 2024 17:39:31 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2024 07:30:07 GMT",
"version": "v2"
}
] | 2024-05-08 | [
[
"Del Grosso",
"Loris",
""
],
[
"Pani",
"Paolo",
""
],
[
"Urbano",
"Alfredo",
""
]
] | We consider a theory in which a real scalar field is Yukawa-coupled to a fermion and has a potential with two non-degenerate vacua. If the coupling is sufficiently strong, a collection of N fermions deforms the true vacuum state, creating energetically-favored false-vacuum pockets in which fermions are trapped. We embed this model within General Relativity and prove that it admits self-gravitating compact objects where the scalar field acquires a non-trivial profile due to non-perturbative effects. We discuss some applications of this general mechanism: i) neutron soliton stars in low-energy effective QCD, which naturally happen to have masses around 2 solar masses and radii around 10 km even without neutron interactions; ii) Higgs false-vacuum pockets in and beyond the Standard Model; iii) dark soliton stars in models with a dark sector. In the latter two examples, we find compelling solutions naturally describing centimeter-size compact objects with masses around 10^-6 solar masses, intriguingly in a range compatible with the OGLE+HSC microlensing anomaly. Besides these interesting examples, the mechanism of non-perturbative vacuum scalarization may play a role in various contexts in and beyond the Standard Model, providing a support mechanism for new compact objects that can form in the early universe, can collapse into primordial black holes through accretion past their maximum mass, and serve as dark matter candidates. |
hep-ph/9407350 | Bashir "a." | A.Bashir and M.R.Pennington | Gauge independent Chiral Symmetry Breaking in Quenched QED | 22 pages, DTP-94/48 | Phys.Rev. D50 (1994) 7679-7689 | 10.1103/PhysRevD.50.7679 | null | hep-ph | null | In quenched QED we construct a non-perturbative fermion-boson vertex that
ensures the fermion propagator satisfies the Ward-Takahashi identity, is
multiplicatively renormalizable, agrees with perturbation theory for weak
couplings and has a critical coupling for dynamical mass generation that is
strictly gauge independent. This is in marked contrast to the rainbow
approximation in which the critical coupling changes by 50% just between the
Landau and Feynman gauges. The use of such a vertex should lead to a more
believable study of mass generation.
| [
{
"created": "Thu, 21 Jul 1994 12:55:07 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Sep 1994 14:26:49 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Bashir",
"A.",
""
],
[
"Pennington",
"M. R.",
""
]
] | In quenched QED we construct a non-perturbative fermion-boson vertex that ensures the fermion propagator satisfies the Ward-Takahashi identity, is multiplicatively renormalizable, agrees with perturbation theory for weak couplings and has a critical coupling for dynamical mass generation that is strictly gauge independent. This is in marked contrast to the rainbow approximation in which the critical coupling changes by 50% just between the Landau and Feynman gauges. The use of such a vertex should lead to a more believable study of mass generation. |
1206.5720 | Massimiliano Alvioli | M. Alvioli, H. Holopainen, K. J. Eskola, M. Strikman | Initial state anisotropies in ultrarelativistic heavy-ion collisions
from the Monte Carlo Glauber model | Contribution to the Sixth International Conference on Quarks and
Nuclear Physics (QNP12), April 16-20, 2012 Palaiseau (France) | PoS(QNP2012)172 | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In hydrodynamicalmodeling of heavy-ion collisions the initial state spatial
anisotropies translate into momentum anisotropies of the final state particle
distributions. Thus, understanding the origin of the initial anisotropies and
quantifying their uncertainties is important for the extraction of specific QCD
matter properties, such as viscosity, from the experimental data. In this work
we study the wounded nucleon approach in the Monte Carlo Glauber model
framework, focusing especially on the uncertainties which arise from the
modeling of the nucleon-nucleon interactions between the colliding nucleon
pairs and nucleon-nucleon correlations inside the colliding nuclei. We compare
the black disk model and a probabilistic profile function approach for the
inelastic nucleon-nucleon interactions, and study the effects of initial state
correlations using state-of-theart modeling of these.
| [
{
"created": "Mon, 25 Jun 2012 16:03:40 GMT",
"version": "v1"
}
] | 2012-06-26 | [
[
"Alvioli",
"M.",
""
],
[
"Holopainen",
"H.",
""
],
[
"Eskola",
"K. J.",
""
],
[
"Strikman",
"M.",
""
]
] | In hydrodynamicalmodeling of heavy-ion collisions the initial state spatial anisotropies translate into momentum anisotropies of the final state particle distributions. Thus, understanding the origin of the initial anisotropies and quantifying their uncertainties is important for the extraction of specific QCD matter properties, such as viscosity, from the experimental data. In this work we study the wounded nucleon approach in the Monte Carlo Glauber model framework, focusing especially on the uncertainties which arise from the modeling of the nucleon-nucleon interactions between the colliding nucleon pairs and nucleon-nucleon correlations inside the colliding nuclei. We compare the black disk model and a probabilistic profile function approach for the inelastic nucleon-nucleon interactions, and study the effects of initial state correlations using state-of-theart modeling of these. |
hep-ph/0409002 | Peter Arnold | Peter Arnold | Quark-Gluon Plasma Thermalization and Plasma Instabilities | 10 pages, 7 figures | null | null | null | hep-ph | null | In this talk, I review the important role played by plasma instabilities in
the thermalization of quark-gluon plasmas at very high energy. [Conference talk
presented at Strong and Electroweak Mattter 2004, Helsinki, Finland, June
16--19.]
| [
{
"created": "Tue, 31 Aug 2004 20:15:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arnold",
"Peter",
""
]
] | In this talk, I review the important role played by plasma instabilities in the thermalization of quark-gluon plasmas at very high energy. [Conference talk presented at Strong and Electroweak Mattter 2004, Helsinki, Finland, June 16--19.] |
2401.02082 | Juhi Oudichhya | Juhi Oudichhya and Ajay Kumar Rai | Spectroscopic study of $D-$ meson in Regge phenomenology | 9 pages, 4 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In last few years the experimental evidence of charmed mesons is increasing
remarkably. In the present work we systematically studied the $D$ meson by
employing Regge phenomenology. By assuming the existence of the quasilinear
Regge trajectories, several relations between Regge slope, intercept, and meson
masses have been extracted. With the aid of these derived relations, Regge
parameters are evaluated in both the ($J,M^{2}$) and ($n,M^{2}$) planes to
obtain the mass spectra of $D$ meson. In the forthcoming years, we believe that
more candidates will be reported and our predictions could provide useful
information for future experimental evidences.
| [
{
"created": "Thu, 4 Jan 2024 06:14:26 GMT",
"version": "v1"
}
] | 2024-01-05 | [
[
"Oudichhya",
"Juhi",
""
],
[
"Rai",
"Ajay Kumar",
""
]
] | In last few years the experimental evidence of charmed mesons is increasing remarkably. In the present work we systematically studied the $D$ meson by employing Regge phenomenology. By assuming the existence of the quasilinear Regge trajectories, several relations between Regge slope, intercept, and meson masses have been extracted. With the aid of these derived relations, Regge parameters are evaluated in both the ($J,M^{2}$) and ($n,M^{2}$) planes to obtain the mass spectra of $D$ meson. In the forthcoming years, we believe that more candidates will be reported and our predictions could provide useful information for future experimental evidences. |
1811.03086 | Bartosz Fornal | Bartosz Fornal, Benjamin Grinstein | Dark Side of the Neutron? | 6 pages, 2 figures; Plenary talk presented at the International
Workshop on Particle Physics at Neutron Sources 2018, Grenoble, France, May
24-26, 2018; based on: Phys. Rev. Lett. 120, 191801 (2018)
[arXiv:1801.01124]; see also arXiv:1810.00862; to be published in EPJ Web of
Conferences | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss our recently proposed interpretation of the discrepancy between
the bottle and beam neutron lifetime experiments as a sign of a dark sector.
The difference between the outcomes of the two types of measurements is
explained by the existence of a neutron dark decay channel with a branching
fraction 1%. Phenomenologically consistent particle physics models for the
neutron dark decay can be constructed and they involve a strongly
self-interacting dark sector. We elaborate on the theoretical developments
around this idea and describe the efforts undertaken to verify it
experimentally.
| [
{
"created": "Wed, 7 Nov 2018 18:59:19 GMT",
"version": "v1"
}
] | 2018-12-12 | [
[
"Fornal",
"Bartosz",
""
],
[
"Grinstein",
"Benjamin",
""
]
] | We discuss our recently proposed interpretation of the discrepancy between the bottle and beam neutron lifetime experiments as a sign of a dark sector. The difference between the outcomes of the two types of measurements is explained by the existence of a neutron dark decay channel with a branching fraction 1%. Phenomenologically consistent particle physics models for the neutron dark decay can be constructed and they involve a strongly self-interacting dark sector. We elaborate on the theoretical developments around this idea and describe the efforts undertaken to verify it experimentally. |
hep-ph/9605228 | Grandou Thierry | Thierry Grandou | On the Light Cone Singularity of the Thermal Effective Expansion | 18 pages | Phys.Lett. B367 (1996) 229-236 | 10.1016/0370-2693(95)01470-5 | INLN 95/25 | hep-ph | null | We consider a scalar massless quantum field model, at finite temperature $T$,
both renormalizable and asymptotically free. Focussing on the singular
structure of the effective perturbation theory about the light cone, several
new insights are put forth, regarding the interplay between hard thermal loop
resummation and the overall compensation of collinear singularities.
| [
{
"created": "Mon, 6 May 1996 13:57:43 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Grandou",
"Thierry",
""
]
] | We consider a scalar massless quantum field model, at finite temperature $T$, both renormalizable and asymptotically free. Focussing on the singular structure of the effective perturbation theory about the light cone, several new insights are put forth, regarding the interplay between hard thermal loop resummation and the overall compensation of collinear singularities. |
1405.6639 | Victor Ilisie | Victor Ilisie and Antonio Pich | Low-mass fermiophobic charged Higgs phenomenology in two-Higgs-doublet
models | 40 pages, 11 figures. Minor typos corrected | JHEP 1409 (2014) 089 | 10.1007/JHEP09(2014)089 | FTUV/14-0526; IFIC/14-36 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the recent discovery of a Higgs-like boson, the possibility of an
enlarged scalar sector arises as a natural question. Experimental searches for
charged scalars have been already performed with negative results. We analyze
the phenomenology associated with a fermiophobic charged Higgs (it does not
couple to fermions at tree level), in two-Higgs-doublet models. All present
experimental bounds are evaded trivially in this case, and one needs to
consider other decay and production channels. We study the associated
production of a charged Higgs with either a $W$ or a neutral scalar boson, and
the relevant decays for a light fermiophobic charged Higgs. The interesting
features of this scenario should result encouraging for the LHC collaborations
to perform searches for such a particle.
| [
{
"created": "Mon, 26 May 2014 16:59:43 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 2014 16:12:55 GMT",
"version": "v2"
},
{
"created": "Mon, 18 May 2015 14:11:13 GMT",
"version": "v3"
}
] | 2015-05-19 | [
[
"Ilisie",
"Victor",
""
],
[
"Pich",
"Antonio",
""
]
] | After the recent discovery of a Higgs-like boson, the possibility of an enlarged scalar sector arises as a natural question. Experimental searches for charged scalars have been already performed with negative results. We analyze the phenomenology associated with a fermiophobic charged Higgs (it does not couple to fermions at tree level), in two-Higgs-doublet models. All present experimental bounds are evaded trivially in this case, and one needs to consider other decay and production channels. We study the associated production of a charged Higgs with either a $W$ or a neutral scalar boson, and the relevant decays for a light fermiophobic charged Higgs. The interesting features of this scenario should result encouraging for the LHC collaborations to perform searches for such a particle. |
1507.02483 | Hajime Fukuda | Cheng-Wei Chiang, Hajime Fukuda, Keisuke Harigaya, Masahiro Ibe and
Tsutomu T. Yanagida | Diboson Resonance as a Portal to Hidden Strong Dynamics | 21 pages, 4 figures | null | null | IPMU15-0104 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new explanation for excess events observed in the search for a
high-mass resonance decaying into dibosons by the ATLAS experiment. The
resonance is identified as a composite spin-$0$ particle that couples to the
Standard Model gauge bosons via dimension-5 operators. The excess events can be
explained if the dimension-5 operators are suppressed by a mass scale of ${\cal
O}(1$-$10$) TeV. We also construct a model of hidden strong gauge dynamics
which realizes the spin-$0$ particle as its lightest composite state, with
appropriate couplings to Standard Model gauge bosons.
| [
{
"created": "Thu, 9 Jul 2015 12:37:03 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2015 05:23:48 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jan 2016 01:54:24 GMT",
"version": "v3"
}
] | 2016-01-11 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"Fukuda",
"Hajime",
""
],
[
"Harigaya",
"Keisuke",
""
],
[
"Ibe",
"Masahiro",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We propose a new explanation for excess events observed in the search for a high-mass resonance decaying into dibosons by the ATLAS experiment. The resonance is identified as a composite spin-$0$ particle that couples to the Standard Model gauge bosons via dimension-5 operators. The excess events can be explained if the dimension-5 operators are suppressed by a mass scale of ${\cal O}(1$-$10$) TeV. We also construct a model of hidden strong gauge dynamics which realizes the spin-$0$ particle as its lightest composite state, with appropriate couplings to Standard Model gauge bosons. |
1412.2676 | Jacques Soffer | Jacques Soffer, Claude Bourrely and Franco Buccella | How large is the gluon polarization in the statistical parton
distributions approach? | 4 pages, 3 figures, Invited talk presented by Jacques Soffer at "
DIFFRACTION 2014 ",May 10 - 15, 2014, Primosten (Croatia) (to be published in
the AIP Conference Proceedings{\deg} | null | 10.1063/1.4915986 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the theoretical foundations of the quantum statistical approach to
parton distributions and we show that by using some recent experimental results
from Deep Inelastic Scattering, we are able to improve the description of the
data by means of a new determination of the parton distributions. We will see
that a large gluon polarization emerges, giving a significant contribution to
the proton spin.
| [
{
"created": "Mon, 8 Dec 2014 17:43:53 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Soffer",
"Jacques",
""
],
[
"Bourrely",
"Claude",
""
],
[
"Buccella",
"Franco",
""
]
] | We review the theoretical foundations of the quantum statistical approach to parton distributions and we show that by using some recent experimental results from Deep Inelastic Scattering, we are able to improve the description of the data by means of a new determination of the parton distributions. We will see that a large gluon polarization emerges, giving a significant contribution to the proton spin. |
0907.5465 | HongWei Ke | Hong-Wei Ke, Xue-Qian Li and Zheng-Tao Wei | Whether new data on $D_s\to f_0(980) e^+ \nu_e$ can be understood if
$f_0(980)$ consists of only the conventional $q\bar{q}$ structure | 13pages, 3 figures; some changes were made, references added.
Accepted by PRD | Phys.Rev.D80:074030,2009 | 10.1103/PhysRevD.80.074030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Only two isospin-singlet scalar mesons $f_0(600)$ ($\sigma$) and $f_0(980)$
exist below 1 GeV, so that it is natural to suppose that they are two energy
eigenstates which are mixtures of ${1\over\sqrt 2}(u\bar u+d\bar d)$ and $s\bar
s$. Is this picture right? Generally, it is considered that $f_0(600)$ mainly
consists of ${1\over\sqrt 2}(u\bar u+d\bar d)$, if so, the dominant component
of $f_0(980)$ should be $s\bar s$. The recent measurement of the CLEO
collaboration on the branching ratio of $D_s\to f_0(980) e^+ \nu_e$ provides an
excellent opportunity to testify the structure of $f_0(980)$, namely whether
the data can be understood as long as it consists of mainly the conventional
$q\bar q$ structure. We calculate the form factors of $D_s\to f_0(980)$ in the
light-front quark model (LFQM) and the corresponding branching ratio of the
semileptonic decay. By fitting the data, we obtain the mixing angle $\phi$. The
obtained mixing angle shows that the $s\bar s$ component in $f_0(980)$ may not
be dominant.
| [
{
"created": "Fri, 31 Jul 2009 04:16:27 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 2009 05:19:38 GMT",
"version": "v2"
}
] | 2009-11-05 | [
[
"Ke",
"Hong-Wei",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Wei",
"Zheng-Tao",
""
]
] | Only two isospin-singlet scalar mesons $f_0(600)$ ($\sigma$) and $f_0(980)$ exist below 1 GeV, so that it is natural to suppose that they are two energy eigenstates which are mixtures of ${1\over\sqrt 2}(u\bar u+d\bar d)$ and $s\bar s$. Is this picture right? Generally, it is considered that $f_0(600)$ mainly consists of ${1\over\sqrt 2}(u\bar u+d\bar d)$, if so, the dominant component of $f_0(980)$ should be $s\bar s$. The recent measurement of the CLEO collaboration on the branching ratio of $D_s\to f_0(980) e^+ \nu_e$ provides an excellent opportunity to testify the structure of $f_0(980)$, namely whether the data can be understood as long as it consists of mainly the conventional $q\bar q$ structure. We calculate the form factors of $D_s\to f_0(980)$ in the light-front quark model (LFQM) and the corresponding branching ratio of the semileptonic decay. By fitting the data, we obtain the mixing angle $\phi$. The obtained mixing angle shows that the $s\bar s$ component in $f_0(980)$ may not be dominant. |
hep-ph/9708397 | K. Matsuda | T. Fukuyama, K. Matsuda and H. Nishiura | CP Violation in Neutrinoless Double Beta Decay | 14pp, LaTeX, 5 EPS Figures | null | null | null | hep-ph | null | We argue three-flavour neutrino mixing. We consider the neutrinos as Majorana
particles and see how the neutrinoless double beta decay constrains the
neutrino mixing angles. Our formulation is widely valid and is applied to the
neutrino oscillation experiment.
| [
{
"created": "Tue, 19 Aug 1997 03:17:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fukuyama",
"T.",
""
],
[
"Matsuda",
"K.",
""
],
[
"Nishiura",
"H.",
""
]
] | We argue three-flavour neutrino mixing. We consider the neutrinos as Majorana particles and see how the neutrinoless double beta decay constrains the neutrino mixing angles. Our formulation is widely valid and is applied to the neutrino oscillation experiment. |
hep-ph/9609411 | Thomas Teubner | K. G. Chetyrkin (MPI fuer Physik, Munich, Germany), J. H. Kuhn (Uni.
Karlsruhe, Germany), T. Teubner (Durham Uni., UK) | Extracting alpha_s from Electron-Positron Annihilation around 10 GeV | 13 pages, LaTeX, 4 figures. Discussion of uncertainties slightly
modified. Version to appear in Physical Review D. The complete paper,
including figures, is also available via anonymous ftp at
ftp://ttpux2.physik.uni-karlsruhe.de/ , or via www at
http://www-ttp.physik.uni-karlsruhe.de/cgi-bin/preprints/ | Phys. Rev. D 56, 3011 (1997) | 10.1103/PhysRevD.56.3011 | TTP96-35 | hep-ph | null | The total cross section for electron-positron annihilation into hadrons is
calculated in the region just below the B meson threshold. QCD corrections up
to third order, quark mass effects, initial state radiation, the running of
alpha_QED and the tails of the Upsilon resonances are included in the
prediction. For given alpha_s the prediction is accurate to 0.5 percent. An
experimental measurement with the corresponding precision would allow to
determine alpha_s with high accuracy at intermediate energies.
| [
{
"created": "Thu, 19 Sep 1996 16:47:25 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jun 1997 13:51:11 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Chetyrkin",
"K. G.",
"",
"MPI fuer Physik, Munich, Germany"
],
[
"Kuhn",
"J. H.",
"",
"Uni.\n Karlsruhe, Germany"
],
[
"Teubner",
"T.",
"",
"Durham Uni., UK"
]
] | The total cross section for electron-positron annihilation into hadrons is calculated in the region just below the B meson threshold. QCD corrections up to third order, quark mass effects, initial state radiation, the running of alpha_QED and the tails of the Upsilon resonances are included in the prediction. For given alpha_s the prediction is accurate to 0.5 percent. An experimental measurement with the corresponding precision would allow to determine alpha_s with high accuracy at intermediate energies. |
1310.4751 | Seishi Enomoto | Seishi Enomoto, Satoshi Iida, Nobuhiro Maekawa, Tomohiro Matsuda | Beauty is more attractive: Particle Production and Moduli trapping with
Higher Dimensional Interaction | 19 pages, 6 figures, 1 table | null | 10.1007/JHEP01(2014)141 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quantum effects on moduli dynamics arising from particle production
near the enhanced symmetry point (ESP). We focus on non-renormalizable
couplings between the moduli field and the field that becomes light at the ESP.
Considering higher dimensional interaction, we find that particle production is
significant in a large area, which is even larger than the area that is
expected from a renormalizable interaction. It is possible to find this
possibility from a trivial adiabatic condition; however the quantitative
estimation of particle production and trapping of the field in motion are far
from trivial. In this paper we study particle production and trapping in
detail, using both the analytical and numerical calculations, to find a clear
and intuitive result that supports trapping in a vast variety of theories. Our
study shows that trapping driven by a non-renormalizable interaction is
possible. This possibility has not been considered in previous works. Some
phenomenological models of particle physics will be mentioned to complement
discussion.
| [
{
"created": "Thu, 17 Oct 2013 15:37:36 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Oct 2013 15:37:42 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jan 2014 02:09:12 GMT",
"version": "v3"
}
] | 2015-06-17 | [
[
"Enomoto",
"Seishi",
""
],
[
"Iida",
"Satoshi",
""
],
[
"Maekawa",
"Nobuhiro",
""
],
[
"Matsuda",
"Tomohiro",
""
]
] | We study quantum effects on moduli dynamics arising from particle production near the enhanced symmetry point (ESP). We focus on non-renormalizable couplings between the moduli field and the field that becomes light at the ESP. Considering higher dimensional interaction, we find that particle production is significant in a large area, which is even larger than the area that is expected from a renormalizable interaction. It is possible to find this possibility from a trivial adiabatic condition; however the quantitative estimation of particle production and trapping of the field in motion are far from trivial. In this paper we study particle production and trapping in detail, using both the analytical and numerical calculations, to find a clear and intuitive result that supports trapping in a vast variety of theories. Our study shows that trapping driven by a non-renormalizable interaction is possible. This possibility has not been considered in previous works. Some phenomenological models of particle physics will be mentioned to complement discussion. |
1709.10508 | Michael Russell | Michael Russell | Top quark physics in the Large Hadron Collider era | v1: 220 pages. PhD thesis, based on 1506.08845, 1512.03360,
1607.04304, 1701.08784 and 1704.01782. v2: typo in eq. (2.62) fixed | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore various aspects of top quark phenomenology at the Large Hadron
Collider and proposed future machines. After summarising the role of the top
quark in the Standard Model (and some of its well-known extensions), we discuss
the formulation of the Standard Model as a low energy effective theory. We
isolate the sector of this effective theory that pertains to the top quark and
that can be probed with top observables at hadron colliders, and present a
global fit of this sector to currently available data from the LHC and
Tevatron. Various directions for future improvement are sketched, including
analysing the potential of boosted observables and future colliders, and we
highlight the importance of using complementary information from different
colliders. Interpretational issues related to the validity of the effective
field theory formulation are elucidated throughout. Finally, we present an
application of artificial neural network algorithms to identifying
highly-boosted top quark events at the LHC, and comment on further refinements
of our analysis that can be made.
| [
{
"created": "Fri, 29 Sep 2017 17:34:46 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jan 2018 14:18:20 GMT",
"version": "v2"
}
] | 2018-02-01 | [
[
"Russell",
"Michael",
""
]
] | We explore various aspects of top quark phenomenology at the Large Hadron Collider and proposed future machines. After summarising the role of the top quark in the Standard Model (and some of its well-known extensions), we discuss the formulation of the Standard Model as a low energy effective theory. We isolate the sector of this effective theory that pertains to the top quark and that can be probed with top observables at hadron colliders, and present a global fit of this sector to currently available data from the LHC and Tevatron. Various directions for future improvement are sketched, including analysing the potential of boosted observables and future colliders, and we highlight the importance of using complementary information from different colliders. Interpretational issues related to the validity of the effective field theory formulation are elucidated throughout. Finally, we present an application of artificial neural network algorithms to identifying highly-boosted top quark events at the LHC, and comment on further refinements of our analysis that can be made. |
2308.14682 | Amit Tiwari | Qaisar Shafi, Amit Tiwari and Cem Salih Un | Muon $g-2$ and dark matter in Supersymmetric $SU(4)_c \times SU(2)_L
\times SU(2)_R$ | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The latest FermiLab muon $g-2$ result shows a $5\sigma$ discrepancy with a
``widely advertised" Standard Model prediction. We consider a supersymmetric
$SU(4)_c \times SU(2)_L \times SU(2)_R$ model in which this discrepancy is
resolved by including contributions to muon $g-2$ from a relatively light SUSY
sector. A variety of realistic coannihilation scenarios can reproduce the
observed dark matter relic abundance. With a significantly reduced discrepancy,
of order $1 \sigma$ or less, the Higgsino-like dark matter solutions are also
viable. We provide benchmark points for these solutions that will be probed in
the direct detection dark matter experiments and collider searches.
| [
{
"created": "Mon, 28 Aug 2023 16:17:28 GMT",
"version": "v1"
}
] | 2023-08-29 | [
[
"Shafi",
"Qaisar",
""
],
[
"Tiwari",
"Amit",
""
],
[
"Un",
"Cem Salih",
""
]
] | The latest FermiLab muon $g-2$ result shows a $5\sigma$ discrepancy with a ``widely advertised" Standard Model prediction. We consider a supersymmetric $SU(4)_c \times SU(2)_L \times SU(2)_R$ model in which this discrepancy is resolved by including contributions to muon $g-2$ from a relatively light SUSY sector. A variety of realistic coannihilation scenarios can reproduce the observed dark matter relic abundance. With a significantly reduced discrepancy, of order $1 \sigma$ or less, the Higgsino-like dark matter solutions are also viable. We provide benchmark points for these solutions that will be probed in the direct detection dark matter experiments and collider searches. |
1905.07008 | Cong Wang | Cong Wang, Jun-Kang He and Ming-Zhen Zhou | Twist-3 contributions to $\gamma\gamma\rightarrow\pi^+\pi^-,K^+K^-$
processes in perturbative QCD approach | 19 pages, 7 figures and 2 tables. Contents improved and more
discussions added | null | 10.1140/epjc/s10052-019-7273-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As one of the simplest hadronic processes, $\gamma\gamma\rightarrow
M^{+}M^{-}$ ($M=\pi,K$) could be a good testing ground for our understanding of
the perturbative and nonperturbative structure of QCD, and will be studied with
high precision at BELLE-\RNum{2} in the near future. In this paper, we revisit
these processes with twist-3 corrections in the perturbative QCD approach based
on the $k_{T}$ factorization theorem, in which transverse degrees of freedom as
well as resummation effects are taken into account. The influence of the
distribution amplitudes on the cross sections are discussed in detail. Our work
shows that not only the transverse momentum effects but also the twist-3
corrections play a significant role in the processes $\gamma\gamma\rightarrow
M^{+}M^{-}$ in the intermediate energy region. Especially in the few GeV
region, the twist-3 contributions become dominant in the cross sections. And it
is noteworthy that both the twist-3 result of the $\pi^{+}\pi^{-}$ cross
section and that of the $K^{+}K^{-}$ cross section agree well with the BELLE
and ALEPH measurements. For the pion and kaon angular distributions, there
still exist discrepancies between our results and the experimental
measurements. Possible reasons for these discrepancies are discussed briefly.
| [
{
"created": "Thu, 16 May 2019 19:36:10 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jul 2019 09:56:10 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Wang",
"Cong",
""
],
[
"He",
"Jun-Kang",
""
],
[
"Zhou",
"Ming-Zhen",
""
]
] | As one of the simplest hadronic processes, $\gamma\gamma\rightarrow M^{+}M^{-}$ ($M=\pi,K$) could be a good testing ground for our understanding of the perturbative and nonperturbative structure of QCD, and will be studied with high precision at BELLE-\RNum{2} in the near future. In this paper, we revisit these processes with twist-3 corrections in the perturbative QCD approach based on the $k_{T}$ factorization theorem, in which transverse degrees of freedom as well as resummation effects are taken into account. The influence of the distribution amplitudes on the cross sections are discussed in detail. Our work shows that not only the transverse momentum effects but also the twist-3 corrections play a significant role in the processes $\gamma\gamma\rightarrow M^{+}M^{-}$ in the intermediate energy region. Especially in the few GeV region, the twist-3 contributions become dominant in the cross sections. And it is noteworthy that both the twist-3 result of the $\pi^{+}\pi^{-}$ cross section and that of the $K^{+}K^{-}$ cross section agree well with the BELLE and ALEPH measurements. For the pion and kaon angular distributions, there still exist discrepancies between our results and the experimental measurements. Possible reasons for these discrepancies are discussed briefly. |
hep-ph/0105246 | Hai-Yang Cheng | Hai-Yang Cheng and Amarjit Soni | Semi-inclusive B Decays and Direct CP Violation in QCD Factorization | 28 pages | Phys.Rev.D64:114013,2001 | 10.1103/PhysRevD.64.114013 | BNL-HET-01/16 | hep-ph hep-ex | null | We have systematically investigated the semi-inclusive B decays B->MX, which
are manifestations of the quark decay b->Mq, within the framework of
QCD-improved factorization. These decays are theoretically clean and have
distinctive experimental signatures. We focus on a class of these that do not
require any form factor information and therefore may be especially suitable
for extracting information on the angles $\alpha$ and $\gamma$ of the unitarity
triangle. The nonfactorizable effects, such as vertex-type and penguin-type
corrections to the two-body b decay and hard spectator corrections to the
3-body decay are calculable in the heavy quark limit. QCD factorization is
applicable when the emitted meson is a light meson or a charmonium. We discuss
the issue of the CPT constraint on partial rate asymmetries. The strong phase
coming from final-state rescattering due to hard gluon exchange between the
final states can induce large rate asymmetries for tree-dominated
color-suppressed modes $(\pi^0,\rho^0,\omega)X_{\bar s}$. The nonfactorizable
hard spectator interactions in the 3-body decay, though phase-space suppressed,
are extremely important for the tree-dominated modes
$(\pi^0,\rho^0,\omega)X_{\bar s}, \phi X$, $J X_s,J X$ and the
penguin-dominated mode $\omega X_{s\bar s}$. In fact, they are dominated by the
hard spectator corrections. Our result for ${\cal B} (B\to J/\psi X_s)$ is in
agreement with experiment. The semi-inclusive decay modes: $B^0_s\to
(\pi^0,\rho^0,\omega)X_{\bar s}$, $\rho^0X_{s\bar s}$, $B^0\to(K^-X,K^{*-}X)$
and $B^-\to (K^0X_s,K^{*0}X_s)$ are the most promising ones in searching for
direct CP violation. In fact, they have branching ratios of order
$10^{-6}-10^{-4}$ and CP rate asymmetries of order $(10-40)%$.
| [
{
"created": "Wed, 23 May 2001 14:28:09 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Soni",
"Amarjit",
""
]
] | We have systematically investigated the semi-inclusive B decays B->MX, which are manifestations of the quark decay b->Mq, within the framework of QCD-improved factorization. These decays are theoretically clean and have distinctive experimental signatures. We focus on a class of these that do not require any form factor information and therefore may be especially suitable for extracting information on the angles $\alpha$ and $\gamma$ of the unitarity triangle. The nonfactorizable effects, such as vertex-type and penguin-type corrections to the two-body b decay and hard spectator corrections to the 3-body decay are calculable in the heavy quark limit. QCD factorization is applicable when the emitted meson is a light meson or a charmonium. We discuss the issue of the CPT constraint on partial rate asymmetries. The strong phase coming from final-state rescattering due to hard gluon exchange between the final states can induce large rate asymmetries for tree-dominated color-suppressed modes $(\pi^0,\rho^0,\omega)X_{\bar s}$. The nonfactorizable hard spectator interactions in the 3-body decay, though phase-space suppressed, are extremely important for the tree-dominated modes $(\pi^0,\rho^0,\omega)X_{\bar s}, \phi X$, $J X_s,J X$ and the penguin-dominated mode $\omega X_{s\bar s}$. In fact, they are dominated by the hard spectator corrections. Our result for ${\cal B} (B\to J/\psi X_s)$ is in agreement with experiment. The semi-inclusive decay modes: $B^0_s\to (\pi^0,\rho^0,\omega)X_{\bar s}$, $\rho^0X_{s\bar s}$, $B^0\to(K^-X,K^{*-}X)$ and $B^-\to (K^0X_s,K^{*0}X_s)$ are the most promising ones in searching for direct CP violation. In fact, they have branching ratios of order $10^{-6}-10^{-4}$ and CP rate asymmetries of order $(10-40)%$. |
1706.00054 | U. J. Salda\~na-Salazar | E. Barradas-Guevara, J. Lorenzo Diaz-Cruz, O. Felix-Beltran, U. J.
Saldana-Salazar | Linking LFV Higgs decays $h\to \ell_i \ell_j$ with CP violation in
multi-scalar models | 25 pages, 11 figures; v2: new references added | null | null | CIFFU 17-01 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of LFV decays of the Higgs boson, $h\to \ell_i \ell_j$, has become
an active research subject both from the experimental and theoretical points of
view. Such decays vanish within the SM and are highly suppressed in several
theoretical extensions. Due to its relevance and relative simplicity to
reconstruct the signal at future colliders, it is an important tool to probe SM
extensions where it could reach detectable levels. Here we identify a mechanism
that induces LFV Higgs interactions, by linking it with the appearance of CP
violation in the scalar sector, within the context of general multi-Higgs
models. We then focus on the simplest model of this type to study its
phenomenology. The scalar sector of this minimal model consisting of a Higgs
doublet and a Froggatt--Nielsen (FN) (complex) singlet is studied thoroughly,
including the scalar spectrum and the Yukawa interactions. Constraints on the
parameters of the model are derived from low-energy observables and LHC Higgs
data, which is then applied to study the resulting predicted rates for the
decay $h\rightarrow \tau \mu$. Overall, branching ratios for $h \rightarrow
\tau \mu$ of the order $10^{-3}$ are obtained within this approach consistent
with all known constraints.
| [
{
"created": "Wed, 31 May 2017 19:20:23 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jun 2017 18:03:06 GMT",
"version": "v2"
}
] | 2017-06-13 | [
[
"Barradas-Guevara",
"E.",
""
],
[
"Diaz-Cruz",
"J. Lorenzo",
""
],
[
"Felix-Beltran",
"O.",
""
],
[
"Saldana-Salazar",
"U. J.",
""
]
] | The study of LFV decays of the Higgs boson, $h\to \ell_i \ell_j$, has become an active research subject both from the experimental and theoretical points of view. Such decays vanish within the SM and are highly suppressed in several theoretical extensions. Due to its relevance and relative simplicity to reconstruct the signal at future colliders, it is an important tool to probe SM extensions where it could reach detectable levels. Here we identify a mechanism that induces LFV Higgs interactions, by linking it with the appearance of CP violation in the scalar sector, within the context of general multi-Higgs models. We then focus on the simplest model of this type to study its phenomenology. The scalar sector of this minimal model consisting of a Higgs doublet and a Froggatt--Nielsen (FN) (complex) singlet is studied thoroughly, including the scalar spectrum and the Yukawa interactions. Constraints on the parameters of the model are derived from low-energy observables and LHC Higgs data, which is then applied to study the resulting predicted rates for the decay $h\rightarrow \tau \mu$. Overall, branching ratios for $h \rightarrow \tau \mu$ of the order $10^{-3}$ are obtained within this approach consistent with all known constraints. |
1208.6202 | Francesco Giacosa | F. Giacosa, D. Parganlija, P. Kovacs, and Gy. Wolf | Phenomenology of light mesons within a chiral approach | Contribution to the 12th International Workshop on Meson Production,
Properties and Interaction, Krakow, Poland 31 May - 5 June 2012.5 pages, 1
Table | null | 10.1051/epjconf/20123708006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The so-called extended linear sigma model is a chiral model with
(pseudo)scalar and (axial-)vector mesons. It is based on the requirements of
(global) chiral symmetry and dilatation invariance. The purpose of this model
is the description of the hadron phenomenology up to 1.7 GeV. We present the
latest theoretical results, which show a good agreement with the experiment.
| [
{
"created": "Thu, 30 Aug 2012 15:24:27 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Giacosa",
"F.",
""
],
[
"Parganlija",
"D.",
""
],
[
"Kovacs",
"P.",
""
],
[
"Wolf",
"Gy.",
""
]
] | The so-called extended linear sigma model is a chiral model with (pseudo)scalar and (axial-)vector mesons. It is based on the requirements of (global) chiral symmetry and dilatation invariance. The purpose of this model is the description of the hadron phenomenology up to 1.7 GeV. We present the latest theoretical results, which show a good agreement with the experiment. |
0802.4423 | Vincenzo Branchina | Vincenzo Branchina, Hugo Faivre, Vincent Pangon | Effective potential and vacuum stability | 10 pages, 4 figures | J.Phys.G36:015006,2009 | 10.1088/0954-3899/36/1/015006 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By following previous work on this subject, we investigate the issue of the
instability of the electroweak vacuum against the top loop corrections by
performing an accurate analysis of a Higgs-Yukawa model. We find that, when the
physical cutoff is properly implemented in the theory, the potential does not
exhibit any instability. Moreover, contrary to recent claims, we show that this
instability cannot be understood in terms of the very insightful work of Wu and
Weinberg on the non-convexity of the one-loop effective potential of a scalar
theory. Some of the theoretical and phenomenological consequences of our
results are briefly discussed.
| [
{
"created": "Fri, 29 Feb 2008 16:16:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Branchina",
"Vincenzo",
""
],
[
"Faivre",
"Hugo",
""
],
[
"Pangon",
"Vincent",
""
]
] | By following previous work on this subject, we investigate the issue of the instability of the electroweak vacuum against the top loop corrections by performing an accurate analysis of a Higgs-Yukawa model. We find that, when the physical cutoff is properly implemented in the theory, the potential does not exhibit any instability. Moreover, contrary to recent claims, we show that this instability cannot be understood in terms of the very insightful work of Wu and Weinberg on the non-convexity of the one-loop effective potential of a scalar theory. Some of the theoretical and phenomenological consequences of our results are briefly discussed. |
0710.4937 | Gudrid Moortgat-Pick | K. Desch, J. Kalinowski, G. Moortgat-Pick, K. Rolbiecki, W.J. Stirling | Heavy sfermions in SUSY analysis at LHC and ILC | Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 1 figure | null | null | IPPP/07/068, DCPT/07/136 | hep-ph | null | The physics potential of the Large Hadron Collider in combination with the
planned International Linear Collider is discussed for a difficult region of
supersymmetry that is characterized by scalar SUSY particles with masses around
2 TeV. Precision measurements of masses, cross sections and forward-backward
asymmetries allow to determine the fundamental supersymmetric parameters even
if only a small part of the spectrum is accessible. No assumptions on a
specific SUSY-breaking mechanism are imposed. Mass contraints for the
kinematically inaccessible particles can be derived.
| [
{
"created": "Thu, 25 Oct 2007 19:29:10 GMT",
"version": "v1"
}
] | 2007-10-26 | [
[
"Desch",
"K.",
""
],
[
"Kalinowski",
"J.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"Rolbiecki",
"K.",
""
],
[
"Stirling",
"W. J.",
""
]
] | The physics potential of the Large Hadron Collider in combination with the planned International Linear Collider is discussed for a difficult region of supersymmetry that is characterized by scalar SUSY particles with masses around 2 TeV. Precision measurements of masses, cross sections and forward-backward asymmetries allow to determine the fundamental supersymmetric parameters even if only a small part of the spectrum is accessible. No assumptions on a specific SUSY-breaking mechanism are imposed. Mass contraints for the kinematically inaccessible particles can be derived. |
1606.06372 | Seyda Ipek | Pilar Coloma and Seyda Ipek | Neutrino masses from a pseudo-Dirac Bino | 5 pages, 2 figures, matches the published version | Phys. Rev. Lett. 117, 111803 (2016) | 10.1103/PhysRevLett.117.111803 | FERMILAB-PUB-16-225-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, in $U(1)_R$-symmetric supersymmetric models, the bino and its
Dirac partner (the singlino) can play the role of right-handed neutrinos and
generate the neutrino masses and mixing, without the need for traditional
bilinear or trilinear R-parity violating operators. The two particles form a
pseudo-Dirac pair, the `bi$\nu$o'. An Inverse Seesaw texture is generated for
the neutrino-bi$\nu$o sector, and the lightest neutrino is predicted to be
massless. Unlike in most models with heavy right-handed neutrinos, the bi$\nu$o
can be sizably produced at the LHC through its interactions with colored
particles, while respecting low energy constraints from neutrinoless
double-beta decay and charged lepton flavor violation.
| [
{
"created": "Tue, 21 Jun 2016 00:21:14 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2016 17:24:29 GMT",
"version": "v2"
}
] | 2016-09-20 | [
[
"Coloma",
"Pilar",
""
],
[
"Ipek",
"Seyda",
""
]
] | We show that, in $U(1)_R$-symmetric supersymmetric models, the bino and its Dirac partner (the singlino) can play the role of right-handed neutrinos and generate the neutrino masses and mixing, without the need for traditional bilinear or trilinear R-parity violating operators. The two particles form a pseudo-Dirac pair, the `bi$\nu$o'. An Inverse Seesaw texture is generated for the neutrino-bi$\nu$o sector, and the lightest neutrino is predicted to be massless. Unlike in most models with heavy right-handed neutrinos, the bi$\nu$o can be sizably produced at the LHC through its interactions with colored particles, while respecting low energy constraints from neutrinoless double-beta decay and charged lepton flavor violation. |
2107.03655 | Stefano Carignano | Stefano Carignano and Cristina Manuel | Power corrections and gradient expansion in QED transport theory | 14 pages, no figures | Phys. Rev. D 104, 056031 (2021) | 10.1103/PhysRevD.104.056031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hard thermal loop (HTL) effective field theory of QED can be derived from
the classical limit of transport theory, corresponding to the leading term in a
gradient expansion of the quantum approach. In this paper, we show that power
corrections to the HTL effective Lagrangian of QED can also be obtained from
transport theory by including higher orders in such gradient expansion. The
gradient expansion is increasingly infrared (IR) divergent, but the correction
that we compute is IR finite. We employ dimensional regularization, and show
that this result comes after a cancellation of divergencies between the vacuum
and medium contributions. While the transport framework is an effective field
theory of the long distance physics of the plasma, we show that it correctly
reproduces the correct QED ultraviolet divergencies associated with the photon
wave function renormalization.
| [
{
"created": "Thu, 8 Jul 2021 07:42:10 GMT",
"version": "v1"
}
] | 2021-10-04 | [
[
"Carignano",
"Stefano",
""
],
[
"Manuel",
"Cristina",
""
]
] | The hard thermal loop (HTL) effective field theory of QED can be derived from the classical limit of transport theory, corresponding to the leading term in a gradient expansion of the quantum approach. In this paper, we show that power corrections to the HTL effective Lagrangian of QED can also be obtained from transport theory by including higher orders in such gradient expansion. The gradient expansion is increasingly infrared (IR) divergent, but the correction that we compute is IR finite. We employ dimensional regularization, and show that this result comes after a cancellation of divergencies between the vacuum and medium contributions. While the transport framework is an effective field theory of the long distance physics of the plasma, we show that it correctly reproduces the correct QED ultraviolet divergencies associated with the photon wave function renormalization. |
2302.02879 | Hyun Min Lee | Seong-Sik Kim, Hyun Min Lee, Kimiko Yamashita | Positivity Bounds on Higgs-Portal Dark Matter | 31 pages, 6 figures, v2: one-loop corrections to the positivity
bounds added, version to be published in JHEP | null | 10.1007/JHEP06(2023)124 | null | hep-ph astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We consider the positivity bounds for WIMP scalar dark matter with effective
Higgs-portal couplings up to dimension-8 operators. Taking the superposed
states for Standard Model Higgs and scalar dark matter, we show that the part
of the parameter space for the effective couplings, otherwise unconstrained by
phenomenological bounds, is ruled out by the positivity bounds on the
dimension-8 derivative operators. We find that dark matter relic density,
direct and indirect detection and LHC constraints are complementary to the
positivity bounds in constraining the effective Higgs-portal couplings. In the
effective theory obtained from massive graviton or radion, there appears a
correlation between dimension-8 operators and other effective Higgs-portal
couplings for which the strong constraint from direct detection can be evaded.
Nailing down the parameter space mainly by relic density, direct detection and
positivity bounds, we find that there are observable cosmic ray signals coming
from the dark matter annihilations into a pair of Higgs bosons, $WW$ or $ZZ$.
| [
{
"created": "Mon, 6 Feb 2023 15:46:35 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jun 2023 12:06:02 GMT",
"version": "v2"
}
] | 2023-07-05 | [
[
"Kim",
"Seong-Sik",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Yamashita",
"Kimiko",
""
]
] | We consider the positivity bounds for WIMP scalar dark matter with effective Higgs-portal couplings up to dimension-8 operators. Taking the superposed states for Standard Model Higgs and scalar dark matter, we show that the part of the parameter space for the effective couplings, otherwise unconstrained by phenomenological bounds, is ruled out by the positivity bounds on the dimension-8 derivative operators. We find that dark matter relic density, direct and indirect detection and LHC constraints are complementary to the positivity bounds in constraining the effective Higgs-portal couplings. In the effective theory obtained from massive graviton or radion, there appears a correlation between dimension-8 operators and other effective Higgs-portal couplings for which the strong constraint from direct detection can be evaded. Nailing down the parameter space mainly by relic density, direct detection and positivity bounds, we find that there are observable cosmic ray signals coming from the dark matter annihilations into a pair of Higgs bosons, $WW$ or $ZZ$. |
hep-ph/0111388 | Martina Brisudova | Martina Brisudova | Small x divergences in a heavy quark-antiquark state | 3 pgs. Talk, originally entitled "Die Hard with Vengence", presented
at the Int. Light-Cone Workshop "Light-Cone Physics: Particles and Strings",
Trento 2001 | Nucl.Phys.Proc.Suppl. 108 (2002) 173-175 | 10.1016/S0920-5632(02)01324-5 | null | hep-ph | null | With the current state of similarity renormalisation group approach to
light-front QCD, it is possible to address with a degree of generality the
issue of light-cone zero modes. We find, contrary to earlier results in a less
general framework, that infrared divergences associated with the zero modes do
not cancel out in a color singlet heavy quark-antiquark states, except for the
lowest order in the nonrelativistic expansion.
| [
{
"created": "Thu, 29 Nov 2001 00:15:26 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Brisudova",
"Martina",
""
]
] | With the current state of similarity renormalisation group approach to light-front QCD, it is possible to address with a degree of generality the issue of light-cone zero modes. We find, contrary to earlier results in a less general framework, that infrared divergences associated with the zero modes do not cancel out in a color singlet heavy quark-antiquark states, except for the lowest order in the nonrelativistic expansion. |
2306.11272 | Sergey Salnikov | S.G. Salnikov, A.E. Bondar, A.I. Milstein | Coupled channels and production of near-threshold $B^{(*)}\bar{B}^{(*)}$
resonances in $e^{+}e^{-}$ annihilation | 15 pages, 11 figures | Nucl. Phys. A 1041, 122764 (2024) | 10.1016/j.nuclphysa.2023.122764 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of final-state interaction of hadrons, produced in $e^{+}e^{-}$
annihilation near the threshold, are discussed. If there is a loosely bound
state or a virtual state in a system of produced hadrons, then the energy
dependence of hadroproduction cross section is very strong. Our approach is
based on the use of the effective potentials accounting for the interaction
between hadrons in the final state. The cases of a few channels with nonzero
transition amplitudes between them are considered. It is shown that these
transitions drastically change the energy dependence of the cross sections. In
particular, a narrow resonance below the threshold in one channel leads to a
broad peak in another channel. We explained the non-trivial energy dependence
of the production cross sections of $B\bar{B}$, $B^{*}\bar{B}$, $B\bar{B}^{*}$,
$B^{*}\bar{B}^{*}$ near the thresholds in $e^{+}e^{-}$ annihilation and
obtained good agreement between our predictions and the experimental data
available.
| [
{
"created": "Tue, 20 Jun 2023 03:59:37 GMT",
"version": "v1"
}
] | 2023-11-21 | [
[
"Salnikov",
"S. G.",
""
],
[
"Bondar",
"A. E.",
""
],
[
"Milstein",
"A. I.",
""
]
] | The effects of final-state interaction of hadrons, produced in $e^{+}e^{-}$ annihilation near the threshold, are discussed. If there is a loosely bound state or a virtual state in a system of produced hadrons, then the energy dependence of hadroproduction cross section is very strong. Our approach is based on the use of the effective potentials accounting for the interaction between hadrons in the final state. The cases of a few channels with nonzero transition amplitudes between them are considered. It is shown that these transitions drastically change the energy dependence of the cross sections. In particular, a narrow resonance below the threshold in one channel leads to a broad peak in another channel. We explained the non-trivial energy dependence of the production cross sections of $B\bar{B}$, $B^{*}\bar{B}$, $B\bar{B}^{*}$, $B^{*}\bar{B}^{*}$ near the thresholds in $e^{+}e^{-}$ annihilation and obtained good agreement between our predictions and the experimental data available. |
1401.0206 | Zhao Zhang | Zhao Zhang and Hai-Peng Su | Fate of separate chiral transitions at finite $\mu_I$ under the
influence of mismatched vector interactions | 12 pages, 8 figures | Phys. Rev. D 89, 054020 (2014) | 10.1103/PhysRevD.89.054020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The flavor-mixing induced by the mismatched vector-isoscalar and
vector-isovector interactions at finite baryon chemical potential $\mu$ and
isospin chemical potential $\mu_I$ is demonstrated in the Nambu-Jona-Lasinio
(NJL) type model of QCD. The influence of this non-anomaly flavor-mixing on the
possible separate chiral transitions at nonzero $\mu_I$ is studied under the
assumption of the effective restoration of the $U(1)_A$ symmetry. We find that
for the weak isospin asymmetry, the two separate phase boundaries found
previously can be converted into one only if the vector-isovector coupling
$g_v^v$ is significantly stronger than the vector-isoscalar one $g_v^s$ without
the axial anomaly. When the weak Kabayashi-Maskawa-'t Hooft (KMT) interaction
is included, we find that the separation of the chiral transition with two
critical endpoints for the relatively strong isospin asymmetry can still be
removed owning to the vector interactions. In this case, it is not the vector
coupling difference but the strength of $g_v^v$ which is crucial for the only
phase boundary. We also point out that, in the NJL-type model with mismatched
vector interactions, the recently proposed equivalence for chiral transitions
at finite $\mu$ and $\mu_I$ does not hold even at the mean field approximation.
| [
{
"created": "Tue, 31 Dec 2013 19:10:57 GMT",
"version": "v1"
}
] | 2014-03-21 | [
[
"Zhang",
"Zhao",
""
],
[
"Su",
"Hai-Peng",
""
]
] | The flavor-mixing induced by the mismatched vector-isoscalar and vector-isovector interactions at finite baryon chemical potential $\mu$ and isospin chemical potential $\mu_I$ is demonstrated in the Nambu-Jona-Lasinio (NJL) type model of QCD. The influence of this non-anomaly flavor-mixing on the possible separate chiral transitions at nonzero $\mu_I$ is studied under the assumption of the effective restoration of the $U(1)_A$ symmetry. We find that for the weak isospin asymmetry, the two separate phase boundaries found previously can be converted into one only if the vector-isovector coupling $g_v^v$ is significantly stronger than the vector-isoscalar one $g_v^s$ without the axial anomaly. When the weak Kabayashi-Maskawa-'t Hooft (KMT) interaction is included, we find that the separation of the chiral transition with two critical endpoints for the relatively strong isospin asymmetry can still be removed owning to the vector interactions. In this case, it is not the vector coupling difference but the strength of $g_v^v$ which is crucial for the only phase boundary. We also point out that, in the NJL-type model with mismatched vector interactions, the recently proposed equivalence for chiral transitions at finite $\mu$ and $\mu_I$ does not hold even at the mean field approximation. |
hep-ph/0105257 | Firooz Arash | Firooz Arash and Ali N. Khorramian | Basic Structure in Hadrons | Contributed paper to XXXVIth RENCONTRES DE MORIOND on "QCD and High
Energy Hadronic Interactions" ps file - 4 pages with 3 figures embeded in the
text | null | null | null | hep-ph | null | We have calculated the Structure function a constituent quark in the NLO and
from it we have derived the structure functions of hadrons. We found that
perturbative generation of hadron structure falls short of conforming with data
by a few percent. This is due to the presence of soft gluon and its radiation
in the hadron. This contribution is modeled into our calculations. It is also
responsible for the breaking of flavor symmetry in the nucleon sea.
| [
{
"created": "Thu, 24 May 2001 15:54:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arash",
"Firooz",
""
],
[
"Khorramian",
"Ali N.",
""
]
] | We have calculated the Structure function a constituent quark in the NLO and from it we have derived the structure functions of hadrons. We found that perturbative generation of hadron structure falls short of conforming with data by a few percent. This is due to the presence of soft gluon and its radiation in the hadron. This contribution is modeled into our calculations. It is also responsible for the breaking of flavor symmetry in the nucleon sea. |
1009.0270 | Matthew Buckley | Matthew R. Buckley and Lisa Randall | Xogenesis | 11 pages, 4 figures | JHEP 1109:009,2011 | 10.1007/JHEP09(2011)009 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new paradigm for dark matter in which a dark matter asymmetry is
established in the early universe that is then transferred to ordinary matter.
We show this scenario can fit naturally into weak scale physics models, with a
dark matter candidate mass of this order. We present several natural
suppression mechanisms, including bleeding dark matter number density into
lepton number, which occurs naturally in models with lepton-violating operators
transferring the asymmetry.
| [
{
"created": "Wed, 1 Sep 2010 20:06:54 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2011 16:02:12 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Buckley",
"Matthew R.",
""
],
[
"Randall",
"Lisa",
""
]
] | We present a new paradigm for dark matter in which a dark matter asymmetry is established in the early universe that is then transferred to ordinary matter. We show this scenario can fit naturally into weak scale physics models, with a dark matter candidate mass of this order. We present several natural suppression mechanisms, including bleeding dark matter number density into lepton number, which occurs naturally in models with lepton-violating operators transferring the asymmetry. |
2312.10828 | Marcin Ku\'zniak Dr. | Marcin Ku\'zniak | Status of direct detection searches of heavy dark matter | Proceedings of XVIII International Conference on Topics in
Astroparticle and Underground Physics (TAUP2023) | PoS(TAUP2023)018 | 10.22323/1.441.0018 | null | hep-ph astro-ph.CO astro-ph.IM hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | Dark matter accounts for 26% of the mass-energy density of the Universe,
however, its nature and origins remain the most important open questions in
physics. The search for Weakly Interacting Massive Particles (WIMPs), one of
the leading dark matter particle candidates, is now in a decisive phase, with
experiments targeting both the high-mass and the low-mass (1-10 GeV/$c^2$) WIMP
scenarios. The status of the leading experimental searches is discussed,
together with their prospects and challenges they are facing. Searches of heavy
non-WIMP dark matter candidates are also briefly summarized.
| [
{
"created": "Sun, 17 Dec 2023 21:56:10 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2024 22:13:55 GMT",
"version": "v2"
}
] | 2024-01-17 | [
[
"Kuźniak",
"Marcin",
""
]
] | Dark matter accounts for 26% of the mass-energy density of the Universe, however, its nature and origins remain the most important open questions in physics. The search for Weakly Interacting Massive Particles (WIMPs), one of the leading dark matter particle candidates, is now in a decisive phase, with experiments targeting both the high-mass and the low-mass (1-10 GeV/$c^2$) WIMP scenarios. The status of the leading experimental searches is discussed, together with their prospects and challenges they are facing. Searches of heavy non-WIMP dark matter candidates are also briefly summarized. |
1205.1557 | Carlos Alberto Vaquera-Araujo | Carlos A. Vaquera-Araujo, Mauro Napsuciale, Rene Angeles-Martinez | Renormalization of the QED of self-interacting second order spin 1/2
fermions | 32 pages, 9 figures. Published version | JHEP01(2013)011 | 10.1007/JHEP01(2013)011 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the one-loop level renormalization of the electrodynamics of spin
1/2 fermions in the Poincar\'e projector formalism, in arbitrary covariant
gauge and including fermion self-interactions, which are dimension four
operators in this framework. We show that the model is renormalizable for
arbitrary values of the tree level gyromagnetic factor g within the validity
region of the perturbative expansion, \alpha g^2 << 1. In the absence of tree
level fermion self-interactions, we recover the pure QED of second order
fermions, which is renormalizable only for |g|=2. Turning off the
electromagnetic interaction we obtain a renormalizable Nambu-Jona-Lasinio-like
model with second order fermions in four space-time dimensions.
| [
{
"created": "Mon, 7 May 2012 22:59:10 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2012 00:44:39 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Jan 2013 19:28:02 GMT",
"version": "v3"
}
] | 2013-01-03 | [
[
"Vaquera-Araujo",
"Carlos A.",
""
],
[
"Napsuciale",
"Mauro",
""
],
[
"Angeles-Martinez",
"Rene",
""
]
] | We study the one-loop level renormalization of the electrodynamics of spin 1/2 fermions in the Poincar\'e projector formalism, in arbitrary covariant gauge and including fermion self-interactions, which are dimension four operators in this framework. We show that the model is renormalizable for arbitrary values of the tree level gyromagnetic factor g within the validity region of the perturbative expansion, \alpha g^2 << 1. In the absence of tree level fermion self-interactions, we recover the pure QED of second order fermions, which is renormalizable only for |g|=2. Turning off the electromagnetic interaction we obtain a renormalizable Nambu-Jona-Lasinio-like model with second order fermions in four space-time dimensions. |
hep-ph/9909490 | Nikolai Krasnikov | N.V.Krasnikov and V.A.Matveev | Search for Standard Higgs Boson at Supercolliders | latex, 70 pages, 15 ps.figures | Phys.Part.Nucl.31:255-281,2000; Fiz.Elem.Chast.Atom.Yadra
31:525-575,2000 | null | null | hep-ph | null | We review the standard Higgs boson physics and the search for higgs boson at
LEP and LHC supercolliders
| [
{
"created": "Thu, 23 Sep 1999 16:29:42 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Krasnikov",
"N. V.",
""
],
[
"Matveev",
"V. A.",
""
]
] | We review the standard Higgs boson physics and the search for higgs boson at LEP and LHC supercolliders |
2106.14913 | Miguel Vanvlasselaer | Aleksandr Azatov, Miguel Vanvlasselaer, Wen Yin | Baryogenesis via relativistic bubble walls | 20 pages + appendix, 5 figures, references added, typos corrected, CP
violation in decay taken into account, JHEP version | null | 10.1007/JHEP10(2021)043 | SISSA 13/2021/FISI TU-1127 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel mechanism which leads to the baryon asymmetry generation
during the strong first order phase transition. If the bubble wall propagates
with ultra-relativistic velocities, it has been shown that it can produce
states much heavier than the scale of the transition and that those states are
then out-of-equilibrium. In this paper, we show that the production mechanism
can also induce CP-violation at one-loop level. We calculate those CP violating
effects during the heavy particle production and show, that combined with
baryon number violating interactions, those can lead to successful
baryogenesis. Two models based on this mechanism are constructed and their
phenomenology is discussed. Stochastic gravitational wave signals turn out to
be generic signatures of this type of models.
| [
{
"created": "Mon, 28 Jun 2021 18:00:49 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Sep 2021 08:54:13 GMT",
"version": "v2"
}
] | 2021-10-27 | [
[
"Azatov",
"Aleksandr",
""
],
[
"Vanvlasselaer",
"Miguel",
""
],
[
"Yin",
"Wen",
""
]
] | We present a novel mechanism which leads to the baryon asymmetry generation during the strong first order phase transition. If the bubble wall propagates with ultra-relativistic velocities, it has been shown that it can produce states much heavier than the scale of the transition and that those states are then out-of-equilibrium. In this paper, we show that the production mechanism can also induce CP-violation at one-loop level. We calculate those CP violating effects during the heavy particle production and show, that combined with baryon number violating interactions, those can lead to successful baryogenesis. Two models based on this mechanism are constructed and their phenomenology is discussed. Stochastic gravitational wave signals turn out to be generic signatures of this type of models. |
hep-ph/9501385 | Ramesh Verma | R. C. Verma and M. P. Khanna | Strong BBP couplings for the charmed baryons | 18 pages, Latex, no figures | Indian J.Pure Appl.Phys. 39 (2001) 615-622 | null | Alberta Thy-02-95; January, 1995 | hep-ph | null | According to the Coleman-Glashow null theorem if all the symmetry breaking
effects belong to the same regular representation (octet in the case of SU(3)
and {\bf 15} in the case of SU(4)) and are generated in a tadpole type
mechanism, the strangeness changing (charm changing) weak transitions generated
through the S$_{6}$ (S$_{9}$) tadpole must vanish. Exploiting this null result,
we find relations between the BBP coupling constants which allow us to write
the coupling constants in terms of two parameters and baryon masses. Fixing
these two parameters ( $g_{NN\pi}$ and $g_{\Lambda \Sigma \pi}$) from
experiments, we estimate the remaining coupling constants.
| [
{
"created": "Thu, 26 Jan 1995 17:26:12 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Verma",
"R. C.",
""
],
[
"Khanna",
"M. P.",
""
]
] | According to the Coleman-Glashow null theorem if all the symmetry breaking effects belong to the same regular representation (octet in the case of SU(3) and {\bf 15} in the case of SU(4)) and are generated in a tadpole type mechanism, the strangeness changing (charm changing) weak transitions generated through the S$_{6}$ (S$_{9}$) tadpole must vanish. Exploiting this null result, we find relations between the BBP coupling constants which allow us to write the coupling constants in terms of two parameters and baryon masses. Fixing these two parameters ( $g_{NN\pi}$ and $g_{\Lambda \Sigma \pi}$) from experiments, we estimate the remaining coupling constants. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.