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/0408171 | Orhan Cakir | O. Cakir (Ankara University, Ankara, Turkey), I. Turk Cakir (Ankara
Nuclear Research and Training Center, Ankara, Turkey), Z. Kirca (Osmangazi
University, Eskisehir, Turkey) | Single production of excited neutrinos at future e^{+}e^{-}, ep and pp
colliders | 16 pages, 11 figures, 4 tables | Phys.Rev. D70 (2004) 075017 | 10.1103/PhysRevD.70.075017 | null | hep-ph | null | We study the potential of the linear collider (LC) with sqrt{s}=0.5 TeV,
linac-ring type ep collider (LCxLHC) with sqrt{s}=3.74 TeV and the large hadron
collider (LHC) with sqrt{s}=14 TeV to search for excited neutrinos through
transition magnetic type couplings with gauge bosons. The excited neutrino
signal and corresponding backgrounds are studied in detail to obtain accessible
mass limits and couplings for these three types of colliders.
| [
{
"created": "Sun, 15 Aug 2004 19:56:59 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2004 18:30:41 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Cakir",
"O.",
"",
"Ankara University, Ankara, Turkey"
],
[
"Cakir",
"I. Turk",
"",
"Ankara\n Nuclear Research and Training Center, Ankara, Turkey"
],
[
"Kirca",
"Z.",
"",
"Osmangazi\n University, Eskisehir, Turkey"
]
] | We study the potential of the linear collider (LC) with sqrt{s}=0.5 TeV, linac-ring type ep collider (LCxLHC) with sqrt{s}=3.74 TeV and the large hadron collider (LHC) with sqrt{s}=14 TeV to search for excited neutrinos through transition magnetic type couplings with gauge bosons. The excited neutrino signal and corresponding backgrounds are studied in detail to obtain accessible mass limits and couplings for these three types of colliders. |
0809.1637 | Mauricio B. Magro | F. de Campos (Unesp, Guaratingueta), O. J. P. Eboli (U. Sao Paulo), M.
B. Magro (FSA, Santo Andre), D. Restrepo (U. de Antioquia) and J. W. F. Valle
(U. de Valencia, IFIC) | Finding the Higgs Boson through Supersymmetry | 7 pages, 7 figures. Final version to appear at PRD. Discussion and
results were enlarged | Phys.Rev.D80:015002,2009 | 10.1103/PhysRevD.80.015002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of displaced vertices containing two b--jets may provide a double
discovery at the Large Hadron Collider (LHC): we show how it may not only
reveal evidence for supersymmetry, but also provide a way to uncover the Higgs
boson necessary in the formulation of the electroweak theory in a large region
of the parameter space. We quantify this explicitly using the simplest minimal
supergravity model with bilinear breaking of R-parity, which accounts for the
observed pattern of neutrino masses and mixings seen in neutrino oscillation
experiments.
| [
{
"created": "Tue, 9 Sep 2008 19:26:44 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2009 20:52:29 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"de Campos",
"F.",
"",
"Unesp, Guaratingueta"
],
[
"Eboli",
"O. J. P.",
"",
"U. Sao Paulo"
],
[
"Magro",
"M. B.",
"",
"FSA, Santo Andre"
],
[
"Restrepo",
"D.",
"",
"U. de Antioquia"
],
[
"Valle",
"J. W. F.",
"",
"U. de Valencia, IFIC"
]
] | The study of displaced vertices containing two b--jets may provide a double discovery at the Large Hadron Collider (LHC): we show how it may not only reveal evidence for supersymmetry, but also provide a way to uncover the Higgs boson necessary in the formulation of the electroweak theory in a large region of the parameter space. We quantify this explicitly using the simplest minimal supergravity model with bilinear breaking of R-parity, which accounts for the observed pattern of neutrino masses and mixings seen in neutrino oscillation experiments. |
hep-ph/9511277 | Marcelo Gleiser | Marcelo Gleiser | Reply to Comment on ``Dynamics of Weak First Order Phase Transitions'' | 4 pages, RevTeX, no figures | Phys.Rev.Lett. 75 (1995) 589 | 10.1103/PhysRevLett.75.589 | null | hep-ph | null | A reply to a Comment by Harris and Jungman (Phys. Rev. Lett. 75 (1995), 588),
concerning my work on phase mixing and its implications to the dynamics of
``weak'' first order phase transitions.
| [
{
"created": "Thu, 9 Nov 1995 14:41:49 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Gleiser",
"Marcelo",
""
]
] | A reply to a Comment by Harris and Jungman (Phys. Rev. Lett. 75 (1995), 588), concerning my work on phase mixing and its implications to the dynamics of ``weak'' first order phase transitions. |
2005.02910 | Sh\=an Hu\'ang | Shan Huang, Baifei Shen, Zhigang Bu, Xiaomei Zhang, Liangliang Ji,
Shuhua Zhai | Axionlike-particle generation by laser-plasma interaction | Accepted manuscript to be published in Physica Scripta. A major
revision in summer 2022 contains 22 pages and updated 5 figures | Phys. Scr. 97 105303 (2022) | 10.1088/1402-4896/ac8b6b | null | hep-ph physics.optics physics.plasm-ph | http://creativecommons.org/licenses/by/4.0/ | The hypothetical axion and axion-like particles, feebly coupled with photon,
have not yet been found in any experiment. With the improvement of laser
technique, much stronger but shorter quasi-static electric and magnetic fields
can be created in laboratory using laser-plasma interaction, compared to the
fields of large magnets, to help the search of axion. In this article, we
discuss the feasibility of ALPs exploration using planarly or cylindrically
symmetric laser-plasma fields as background and an x-ray free-electron laser as
probe. Both the probe and the background fields are polarized such that the
existence of ALPs in the corresponding parameter space will cause polarization
rotation of the probe, which can be detected with high accuracy. Besides, a
structured field in the plasma creates a tunable transverse profile for the
interaction and improves the signal-to-noise ratio via phase-matching
mechanism. The ALP mass discussed in this article ranges from $10^{-3}$ eV to 1
keV. Some simple schemes and estimations on ALP production and polarization
rotation of probe photon are given, which reveals the possibility of future
laser-plasma ALP source in laboratory.
| [
{
"created": "Wed, 6 May 2020 15:32:15 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Jul 2020 00:00:53 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Sep 2022 18:59:32 GMT",
"version": "v3"
}
] | 2022-09-07 | [
[
"Huang",
"Shan",
""
],
[
"Shen",
"Baifei",
""
],
[
"Bu",
"Zhigang",
""
],
[
"Zhang",
"Xiaomei",
""
],
[
"Ji",
"Liangliang",
""
],
[
"Zhai",
"Shuhua",
""
]
] | The hypothetical axion and axion-like particles, feebly coupled with photon, have not yet been found in any experiment. With the improvement of laser technique, much stronger but shorter quasi-static electric and magnetic fields can be created in laboratory using laser-plasma interaction, compared to the fields of large magnets, to help the search of axion. In this article, we discuss the feasibility of ALPs exploration using planarly or cylindrically symmetric laser-plasma fields as background and an x-ray free-electron laser as probe. Both the probe and the background fields are polarized such that the existence of ALPs in the corresponding parameter space will cause polarization rotation of the probe, which can be detected with high accuracy. Besides, a structured field in the plasma creates a tunable transverse profile for the interaction and improves the signal-to-noise ratio via phase-matching mechanism. The ALP mass discussed in this article ranges from $10^{-3}$ eV to 1 keV. Some simple schemes and estimations on ALP production and polarization rotation of probe photon are given, which reveals the possibility of future laser-plasma ALP source in laboratory. |
1012.0193 | Tobias Goecke | Tobias Goecke, Christian S. Fischer and Richard Williams | Hadronic contribution to the muon g-2 from a Dyson-Schwinger perspective | 3 pages, 5 figures; Contribution to the proceedings of `Quark
Confinement And The Hadron Spectrum IX', Madrid, Sept. 2010 | null | 10.1063/1.3575087 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel approach towards the hadronic contributions to the anomalous magnetic
moment of the muon $a_{\mu}$ is presented, namely the Dyson-Schwinger equations
of QCD. It has the advantage of being valid for all momentum scales and has the
potential to address off-shell amplitudes. We present our first results for the
pseudoscalar (PS) meson exchange and the quark loop contributions. The meson
exchange ($\pi^0, \eta, \eta'$), $a_\mu^{\textrm{LBL;PS}}=(84 \pm 13)\times
10^{-11}$, is commensurate with previous calculations, while the quark loop
contribution $a_\mu^{\textrm{LBL;quarkloop}} = (107 \pm 48)\times 10^{-11}$, is
strongly enhanced by vertex dressing effects in the quark photon vertex. Taken
seriously this leads to the estimate of $a_\mu=116\,591\,865.0(96.6)\times
10^{-11}$, giving a 1.9 $\sigma$ deviation between theory and experiment.
| [
{
"created": "Wed, 1 Dec 2010 13:49:04 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Goecke",
"Tobias",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Williams",
"Richard",
""
]
] | A novel approach towards the hadronic contributions to the anomalous magnetic moment of the muon $a_{\mu}$ is presented, namely the Dyson-Schwinger equations of QCD. It has the advantage of being valid for all momentum scales and has the potential to address off-shell amplitudes. We present our first results for the pseudoscalar (PS) meson exchange and the quark loop contributions. The meson exchange ($\pi^0, \eta, \eta'$), $a_\mu^{\textrm{LBL;PS}}=(84 \pm 13)\times 10^{-11}$, is commensurate with previous calculations, while the quark loop contribution $a_\mu^{\textrm{LBL;quarkloop}} = (107 \pm 48)\times 10^{-11}$, is strongly enhanced by vertex dressing effects in the quark photon vertex. Taken seriously this leads to the estimate of $a_\mu=116\,591\,865.0(96.6)\times 10^{-11}$, giving a 1.9 $\sigma$ deviation between theory and experiment. |
hep-ph/0002302 | Z. Merebashvili | J.G. K\"orner, B. Melic, Z. Merebashvili | Analyticity, crossing and the absorptive parts of the one-loop
contributions to the quark-quark-gluon gauge boson four-point function | 23 pages, 5 figures, typos corrected. Version to appear in Phys. Rev.
D | Phys.Rev. D62 (2000) 096011 | 10.1103/PhysRevD.62.096011 | MZ-TH/99-11, IRB-TH/2000-1, TSU HEPI/2000-01 | hep-ph | null | Starting from the known one-loop result for the $e^{+}e^{-}$-annihilation
process $e^{+}e^{-}\stackrel{\gamma,Z} {\longrightarrow} q\bar{q}g$ with
massless quarks we employ analyticity and crossing to determine the absorptive
parts of the corresponding one-loop contributions in Deep Inelastic Scattering
(DIS) and in the Drell-Yan process (DY). Whereas the ${\cal O}(\alpha_s^2)$
absorptive parts generate a non-measurable phase factor in the
$e^{+}e^{-}$-annihilation channel one obtains measurable phase effects from the
one-loop contributions in the deep inelastic and in the Drell-Yan case. We
compare our results with the results of previous calculations where the
absorptive parts in DIS and in the DY process were calculated directly in the
respective channels. We also present some new results on the dispersive and
absorptive contributions of the triangle anomaly graph to the DIS process.
| [
{
"created": "Tue, 29 Feb 2000 16:52:26 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2000 09:20:45 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Körner",
"J. G.",
""
],
[
"Melic",
"B.",
""
],
[
"Merebashvili",
"Z.",
""
]
] | Starting from the known one-loop result for the $e^{+}e^{-}$-annihilation process $e^{+}e^{-}\stackrel{\gamma,Z} {\longrightarrow} q\bar{q}g$ with massless quarks we employ analyticity and crossing to determine the absorptive parts of the corresponding one-loop contributions in Deep Inelastic Scattering (DIS) and in the Drell-Yan process (DY). Whereas the ${\cal O}(\alpha_s^2)$ absorptive parts generate a non-measurable phase factor in the $e^{+}e^{-}$-annihilation channel one obtains measurable phase effects from the one-loop contributions in the deep inelastic and in the Drell-Yan case. We compare our results with the results of previous calculations where the absorptive parts in DIS and in the DY process were calculated directly in the respective channels. We also present some new results on the dispersive and absorptive contributions of the triangle anomaly graph to the DIS process. |
2212.00092 | Giuseppe Gaetano Luciano Dr | Giuseppe Gaetano Luciano | On the flavor/mass dichotomy for mixed neutrinos: a phenomenologically
motivated analysis based on lepton charge conservation in neutron decay | 16 pages, accepted for publication in EPJ Plus | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Flavor/mass dichotomy} for mixed fields is one of the most controversial
issues in Quantum Field Theory. In this work we approach the problem by
considering mixing of neutrinos and computing the transition amplitude for the
paradigmatic neutron $\beta$-decay $n\,\rightarrow\, p \,+\,e^ \,+\,\bar\nu$.
Calculations are developed by utilizing the following different representations
of neutrino states: \emph{i}) Pontecorvo states, \emph{ii}) mass states and
\emph{iii}) exact QFT flavor states, which are defined as eigenstates of the
flavor charge. As a guiding principle, we invoke the conservation of lepton
charge in the interaction vertex, which is fundamentally inbuilt into the
Standard Model at tree level. In the short-time limit, we show that the only
fully consistent scenario is that based on QFT states, whereas the other two
frameworks contradict the underlying theory. This result provides a crucial
step towards understanding the r\^ole of neutrino mixing in weak decays and
contributes to elucidate the flavor/mass controversy in QFT.
| [
{
"created": "Mon, 28 Nov 2022 16:16:18 GMT",
"version": "v1"
}
] | 2022-12-02 | [
[
"Luciano",
"Giuseppe Gaetano",
""
]
] | Flavor/mass dichotomy} for mixed fields is one of the most controversial issues in Quantum Field Theory. In this work we approach the problem by considering mixing of neutrinos and computing the transition amplitude for the paradigmatic neutron $\beta$-decay $n\,\rightarrow\, p \,+\,e^ \,+\,\bar\nu$. Calculations are developed by utilizing the following different representations of neutrino states: \emph{i}) Pontecorvo states, \emph{ii}) mass states and \emph{iii}) exact QFT flavor states, which are defined as eigenstates of the flavor charge. As a guiding principle, we invoke the conservation of lepton charge in the interaction vertex, which is fundamentally inbuilt into the Standard Model at tree level. In the short-time limit, we show that the only fully consistent scenario is that based on QFT states, whereas the other two frameworks contradict the underlying theory. This result provides a crucial step towards understanding the r\^ole of neutrino mixing in weak decays and contributes to elucidate the flavor/mass controversy in QFT. |
1709.04758 | Francesco Giovanni Celiberto | Francesco Giovanni Celiberto, Dmitry Yu. Ivanov, Beatrice Murdaca,
Alessandro Papa | Inclusive dihadron production at the LHC in NLA BFKL | 6 pages, 1 figure, presented by F.G. Celiberto at the 17th conference
on Elastic and Diffractive Scattering, EDS Blois 2017, Prague, Czech
Republic, June 26-30, 2017 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A study of cross sections and azimuthal correlation moments for the inclusive
production of two, light charged hadrons featuring large transverse momenta and
well separated in rapidity at LHC energies, including BFKL resummation effects
with NLA accuracy, is presented. This reaction shares the same theoretical
setup with the well konwn Mueller-Navelet jet production and can be thought of
as a new and complementary channel to access the BFKL dynamics at proton
colliders.
| [
{
"created": "Thu, 14 Sep 2017 13:08:34 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2017 14:26:50 GMT",
"version": "v2"
}
] | 2017-10-04 | [
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Ivanov",
"Dmitry Yu.",
""
],
[
"Murdaca",
"Beatrice",
""
],
[
"Papa",
"Alessandro",
""
]
] | A study of cross sections and azimuthal correlation moments for the inclusive production of two, light charged hadrons featuring large transverse momenta and well separated in rapidity at LHC energies, including BFKL resummation effects with NLA accuracy, is presented. This reaction shares the same theoretical setup with the well konwn Mueller-Navelet jet production and can be thought of as a new and complementary channel to access the BFKL dynamics at proton colliders. |
2004.07617 | Maciej Rybczynski | Zbigniew W{\l}odarczyk and Maciej Rybczy\'nski | Inelasticity resulting from rapidity spectra analysis | null | New J. Phys. 22 113002 (2020) | 10.1088/1367-2630/abc1ca | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the pseudorapidity spectra o charged particles produced
in proton+proton and proton+antiproton interactions in a wide energy range
using the non-extensive Tsallis approach. We evaluate the inelasticity
coefficients of the discussed reactions which remain approximately independent
of the collision energy.
| [
{
"created": "Thu, 16 Apr 2020 12:06:08 GMT",
"version": "v1"
}
] | 2020-11-13 | [
[
"Włodarczyk",
"Zbigniew",
""
],
[
"Rybczyński",
"Maciej",
""
]
] | In this work we study the pseudorapidity spectra o charged particles produced in proton+proton and proton+antiproton interactions in a wide energy range using the non-extensive Tsallis approach. We evaluate the inelasticity coefficients of the discussed reactions which remain approximately independent of the collision energy. |
1409.1115 | Chitta Ranjan Das | C.R. Das and L.V. Laperashvili | Graviweak Unification in the Visible and Invisible Universe and
Inflation from the Higgs Field False Vacuum | 9 pages | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we develop the self-consistent $Spin(4,4)$-invariant
model of the unification of gravity with weak $SU(2)$ interactions in the
assumption of the existence of visible and invisible sectors of the Universe.
It was shown that the consequences of the multiple point principle predicting
two degenerate vacua in the Standard Model (SM) suggest a theory of Inflation,
in which the inflaton field $\sigma$ starts trapped in a cold coherent state in
the "false vacuum" of the Universe at the value of the Higgs field's VEV $v\sim
10^{18}$ GeV (in the visible world). Then the inflations of the two Higgs
doublet fields, visible $\phi$ and mirror $\phi'$, lead to the emergence of the
SM vacua at the Electroweak scales with the Higgs boson VEVs $v_1\approx 246$
GeV and $v'_1=\zeta v_1$ (with $\zeta \sim 100$) in the visible and invisible
worlds, respectively.
| [
{
"created": "Wed, 3 Sep 2014 15:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Sep 2014 15:07:47 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Jul 2015 11:51:57 GMT",
"version": "v3"
}
] | 2015-07-17 | [
[
"Das",
"C. R.",
""
],
[
"Laperashvili",
"L. V.",
""
]
] | In the present paper we develop the self-consistent $Spin(4,4)$-invariant model of the unification of gravity with weak $SU(2)$ interactions in the assumption of the existence of visible and invisible sectors of the Universe. It was shown that the consequences of the multiple point principle predicting two degenerate vacua in the Standard Model (SM) suggest a theory of Inflation, in which the inflaton field $\sigma$ starts trapped in a cold coherent state in the "false vacuum" of the Universe at the value of the Higgs field's VEV $v\sim 10^{18}$ GeV (in the visible world). Then the inflations of the two Higgs doublet fields, visible $\phi$ and mirror $\phi'$, lead to the emergence of the SM vacua at the Electroweak scales with the Higgs boson VEVs $v_1\approx 246$ GeV and $v'_1=\zeta v_1$ (with $\zeta \sim 100$) in the visible and invisible worlds, respectively. |
1307.6689 | Vadim Guzey | V. Guzey and M. Zhalov (PNPI, Gatchina) | Rapidity and momentum transfer distributions of coherent $J/\psi$
photoproduction in ultraperipheral pPb collisions at the LHC | 18 pages, 8 figures. The final published version | JHEP 02 (2014) 046 | 10.1007/JHEP02(2014)046 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on accurate calculations of the flux of equivalent photons of the
proton and heavy nuclei and the pQCD framework for the gluon distribution in
the proton and nuclei, we analyze the rapidity and momentum transfer
distributions of coherent $J/\psi$ photoproduction in ultraperipheral proton-Pb
collisions at the LHC. We demonstrate that unlike the case of proton-proton
UPCs marred by certain theoretical uncertainties and experimental limitations,
after a cut excluding the region of small momentum transfers, ultraperipheral
proton-Pb collisions offer a clean way to study the gluon distribution in the
proton down to $x \approx 10^{-5}$. Our analysis of the momentum transfer
distributions shows that an interplay of $J/\psi$ production by low-energy
photons on the nucleus and by high-energy photons on the proton in proton-Pb
UPCs can result in some excess of events at small $p_t$ in a definite region of
the rapidity y.
| [
{
"created": "Thu, 25 Jul 2013 10:29:08 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Mar 2014 14:52:25 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Guzey",
"V.",
"",
"PNPI, Gatchina"
],
[
"Zhalov",
"M.",
"",
"PNPI, Gatchina"
]
] | Based on accurate calculations of the flux of equivalent photons of the proton and heavy nuclei and the pQCD framework for the gluon distribution in the proton and nuclei, we analyze the rapidity and momentum transfer distributions of coherent $J/\psi$ photoproduction in ultraperipheral proton-Pb collisions at the LHC. We demonstrate that unlike the case of proton-proton UPCs marred by certain theoretical uncertainties and experimental limitations, after a cut excluding the region of small momentum transfers, ultraperipheral proton-Pb collisions offer a clean way to study the gluon distribution in the proton down to $x \approx 10^{-5}$. Our analysis of the momentum transfer distributions shows that an interplay of $J/\psi$ production by low-energy photons on the nucleus and by high-energy photons on the proton in proton-Pb UPCs can result in some excess of events at small $p_t$ in a definite region of the rapidity y. |
hep-ph/0301162 | Casalbuoni | Roberto Casalbuoni | Anisotropic Color Superconductivity | LaTex 17 pages, 6 figures. Contributed paper to the International
Workshop SCGT 02 "Strong Coupling Gauge Theories and Effective Field
Theories", 10-13 December 2002, Nagoya, Japan | null | 10.1142/9789812795120_0016 | CERN-TH/2003/008 | hep-ph cond-mat.supr-con nucl-th | null | We discuss the possibility that in finite density QCD an anisotropic phase is
realized. This case might arise for quarks with different chemical potential
and/or different masses. In this phase crystalline structures may be formed. We
consider this possibility and we describe, in the context of an effective
lagrangian, the corresponding phonons as the Nambu-Goldstone bosons associated
to the breaking of the space symmetries.
| [
{
"created": "Mon, 20 Jan 2003 14:41:41 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Casalbuoni",
"Roberto",
""
]
] | We discuss the possibility that in finite density QCD an anisotropic phase is realized. This case might arise for quarks with different chemical potential and/or different masses. In this phase crystalline structures may be formed. We consider this possibility and we describe, in the context of an effective lagrangian, the corresponding phonons as the Nambu-Goldstone bosons associated to the breaking of the space symmetries. |
hep-ph/0603075 | Maria Fidecaro | Maria Fidecaro (1), Hans-Juerg Gerber (2) ((1) CERN, Geneva, (2) IPP,
ETH, Zurich) | The fundamental symmetries in the neutral kaon system -- a pedagogical
choice -- | 63 pages, 15 figures. Corrections have been applied to Eq. (133) and
to the Table in Section 4.1 | Rept.Prog.Phys. 69 (2006) 1713-1770; Erratum - Rept.Prog.Phys. 69
(2006) 2841 | 10.1088/0034-4885/69/6/R03 | null | hep-ph | null | During the recent years experiments with neutral kaons have yielded
remarkably sensitive results which are pertinent to such fundamental phenomena
as CPT invariance (protecting causality), time-reversal invariance violation,
coherence of wave functions, and entanglement of kaons in pair states. We
describe the phenomenological developments and the theoretical conclusions
drawn from the experimental material. An outlook to future experimentation is
indicated. An overview of formal similarities in fields outside neutral kaons
is included.
| [
{
"created": "Thu, 9 Mar 2006 16:19:35 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2006 14:22:36 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Fidecaro",
"Maria",
""
],
[
"Gerber",
"Hans-Juerg",
""
]
] | During the recent years experiments with neutral kaons have yielded remarkably sensitive results which are pertinent to such fundamental phenomena as CPT invariance (protecting causality), time-reversal invariance violation, coherence of wave functions, and entanglement of kaons in pair states. We describe the phenomenological developments and the theoretical conclusions drawn from the experimental material. An outlook to future experimentation is indicated. An overview of formal similarities in fields outside neutral kaons is included. |
hep-ph/0110100 | Nikolai Sushilov | S. I. Kruglov | Pair Production and Vacuum Polarization of Vector Particles with
Electric Dipole Moments and Anomalous Magnetic Moments | 20 pages, LaTeX, accepted for publication in Eur.Phys.J.C | Eur.Phys.J.C22:89-98,2001 | 10.1007/s100520100776 | null | hep-ph | null | The matrix, 8-component Dirac-like form of P-odd equations for boson fields
of spins 1 and 0 are obtained and the GL(2,c) symmetry group of equations is
derived. We found exact solutions of the field equation for vector particles
with arbitrary electric and magnetic moments in external constant and uniform
electromagnetic fields. The differential probability of pair production of
vector particles with the EDM and AMM by an external constant and uniform
electromagnetic field has been found using the exact solutions. We have
calculated the imaginary and real parts of the electromagnetic field Lagrangian
that takes into account the vacuum polarization of vector particles.
| [
{
"created": "Sat, 6 Oct 2001 16:38:21 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Kruglov",
"S. I.",
""
]
] | The matrix, 8-component Dirac-like form of P-odd equations for boson fields of spins 1 and 0 are obtained and the GL(2,c) symmetry group of equations is derived. We found exact solutions of the field equation for vector particles with arbitrary electric and magnetic moments in external constant and uniform electromagnetic fields. The differential probability of pair production of vector particles with the EDM and AMM by an external constant and uniform electromagnetic field has been found using the exact solutions. We have calculated the imaginary and real parts of the electromagnetic field Lagrangian that takes into account the vacuum polarization of vector particles. |
1412.7418 | Shun Zhou | Jia-Shu Lu, Jun Cao, Yu-Feng Li, Shun Zhou | Constraining Absolute Neutrino Masses via Detection of Galactic
Supernova Neutrinos at JUNO | 22 pages, 6 figures, more discussions on systematic uncertainties,
matches the published version | JCAP 05 (2015) 044 | 10.1088/1475-7516/2015/05/044 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A high-statistics measurement of the neutrinos from a galactic core-collapse
supernova is extremely important for understanding the explosion mechanism, and
studying the intrinsic properties of neutrinos themselves. In this paper, we
explore the possibility to constrain the absolute scale of neutrino masses
$m^{}_\nu$ via the detection of galactic supernova neutrinos at the Jiangmen
Underground Neutrino Observatory (JUNO) with a 20 kiloton liquid-scintillator
detector. In assumption of a nearly-degenerate neutrino mass spectrum and a
normal mass ordering, the upper bound on the absolute neutrino mass is found to
be $m^{}_\nu < (0.83 \pm 0.24)~{\rm eV}$ at the 95% confidence level for a
typical galactic supernova at a distance of 10 kpc, where the mean value and
standard deviation are shown to account for statistical fluctuations. For
comparison, we find that the bound in the Super-Kamiokande experiment is
$m^{}_\nu < (0.94 \pm 0.28)~{\rm eV}$ at the same confidence level. However,
the upper bound will be relaxed when the model parameters characterizing the
time structure of supernova neutrino fluxes are not exactly known, and when the
neutrino mass ordering is inverted.
| [
{
"created": "Tue, 23 Dec 2014 15:55:03 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2015 00:59:41 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Lu",
"Jia-Shu",
""
],
[
"Cao",
"Jun",
""
],
[
"Li",
"Yu-Feng",
""
],
[
"Zhou",
"Shun",
""
]
] | A high-statistics measurement of the neutrinos from a galactic core-collapse supernova is extremely important for understanding the explosion mechanism, and studying the intrinsic properties of neutrinos themselves. In this paper, we explore the possibility to constrain the absolute scale of neutrino masses $m^{}_\nu$ via the detection of galactic supernova neutrinos at the Jiangmen Underground Neutrino Observatory (JUNO) with a 20 kiloton liquid-scintillator detector. In assumption of a nearly-degenerate neutrino mass spectrum and a normal mass ordering, the upper bound on the absolute neutrino mass is found to be $m^{}_\nu < (0.83 \pm 0.24)~{\rm eV}$ at the 95% confidence level for a typical galactic supernova at a distance of 10 kpc, where the mean value and standard deviation are shown to account for statistical fluctuations. For comparison, we find that the bound in the Super-Kamiokande experiment is $m^{}_\nu < (0.94 \pm 0.28)~{\rm eV}$ at the same confidence level. However, the upper bound will be relaxed when the model parameters characterizing the time structure of supernova neutrino fluxes are not exactly known, and when the neutrino mass ordering is inverted. |
hep-ph/0305239 | Hiroki Sato | Hiroki Sato | J/Psi Production in p+p Collisions at sqrt(s) = 200 GeV | Ph.D Thesis submitted to Kyoto University, January, 2003. 95 pages
and 18 (external) figures | Mem.Fac.Sci.Kyoto (Ser.A
Phys.Astrophys.Geophys.Chem.44:89-193,2003 | null | null | hep-ph | null | Total and differential cross sections for inclusive $J/\psi$ production have
been measured in $\sqrt{s} =$ 200 GeV proton-proton collisions at BNL-RHIC.
$J/\psi$ particles have been identified via $\mu^{+}\mu^{-}$ decays measured in
the forward muon spectrometer covering $1.2 < y < 2.2$ and via $e^{+}e^{-}$
decays measured in the mid-rapidity spectrometers of the PHENIX experiment.
Details of the muon channel measurement are presented in this paper based upon
an 81-nb$^{-1}$ integrated luminosity obtained in the first p+p run at RHIC.
Results are compared with previous experiments as well as theoretical model
predictions.
| [
{
"created": "Thu, 22 May 2003 19:04:08 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Sato",
"Hiroki",
""
]
] | Total and differential cross sections for inclusive $J/\psi$ production have been measured in $\sqrt{s} =$ 200 GeV proton-proton collisions at BNL-RHIC. $J/\psi$ particles have been identified via $\mu^{+}\mu^{-}$ decays measured in the forward muon spectrometer covering $1.2 < y < 2.2$ and via $e^{+}e^{-}$ decays measured in the mid-rapidity spectrometers of the PHENIX experiment. Details of the muon channel measurement are presented in this paper based upon an 81-nb$^{-1}$ integrated luminosity obtained in the first p+p run at RHIC. Results are compared with previous experiments as well as theoretical model predictions. |
hep-ph/9711293 | Yuan Tuo | Yong Liu, Jing-Ling Chen | New Constraint on the Parameters in Cabibbo-Kobayashi-Maskawa Matrix of
Wolfenstein's Parametrization | 5 pages, Latex file, the final revised version for submitting | null | null | null | hep-ph | null | Based on the relation between CP-violation phase and the other three mixing
angles in Cabibbo-Kobayashi-Maskawa matrix postulated by us before, a new
constraint on the parameters of Wolfenstein's parametrization is given. The
result is consistent with the relative experimental results and can be further
put to the more precise tests in future.
| [
{
"created": "Wed, 12 Nov 1997 12:14:24 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Nov 1997 03:13:29 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Nov 1997 11:59:58 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Liu",
"Yong",
""
],
[
"Chen",
"Jing-Ling",
""
]
] | Based on the relation between CP-violation phase and the other three mixing angles in Cabibbo-Kobayashi-Maskawa matrix postulated by us before, a new constraint on the parameters of Wolfenstein's parametrization is given. The result is consistent with the relative experimental results and can be further put to the more precise tests in future. |
1005.4901 | Christopher Kolda | Antonio Delgado, Christopher Kolda, J. Pocahontas Olson and Alejandro
de la Puente | A Gauge-Mediated Embedding of the S-MSSM | 22 pages, 4 PDF figures | Phys.Rev.D82:035006,2010 | 10.1103/PhysRevD.82.035006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We embed the S-MSSM -- a singlet extension of the minimal supersymmetric
standard model with an explicit mu-term and supersymmetric mass term -- in a
gauge-mediated supersymmetry breaking scheme. We find that by absolving the
singlet of its responsibility for solving the mu-problem, we are instead able
to solve the little hierarchy problem naturally. Specifically, we find that
even with a minimal embedding of the S-MSSM into a gauge-mediated scheme, we
can easily raise the lightest Higgs mass above 114 GeV, while keeping top
squarks below the TeV scale, maintaining perturbative unification of the gauge
couplings, and without tuning the other parameters of the model.
| [
{
"created": "Wed, 26 May 2010 18:11:54 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Delgado",
"Antonio",
""
],
[
"Kolda",
"Christopher",
""
],
[
"Olson",
"J. Pocahontas",
""
],
[
"de la Puente",
"Alejandro",
""
]
] | We embed the S-MSSM -- a singlet extension of the minimal supersymmetric standard model with an explicit mu-term and supersymmetric mass term -- in a gauge-mediated supersymmetry breaking scheme. We find that by absolving the singlet of its responsibility for solving the mu-problem, we are instead able to solve the little hierarchy problem naturally. Specifically, we find that even with a minimal embedding of the S-MSSM into a gauge-mediated scheme, we can easily raise the lightest Higgs mass above 114 GeV, while keeping top squarks below the TeV scale, maintaining perturbative unification of the gauge couplings, and without tuning the other parameters of the model. |
hep-ph/9312217 | Giorgos Leontaris | T. S. Kosmas, G. K. Leontaris and J. D. Vergados | Lepton Flavor Non-Conservation | (IOA-300/93, review article, 83p, 6 epsf figures , available upon
request from gleonta@cc.uoi.gr) % | Prog.Part.Nucl.Phys.33:397-448,1994 | 10.1016/0146-6410(94)90047-7 | null | hep-ph | null | In the present work we review the most prominent lepton flavor violating
processes ($\mu \ra e\gamma$, $\mu \ra 3e$, $(\mu , e)$ conversion, $M-\bar M$
oscillations etc), in the context of unified gauge theories. Many currently
fashionable extensions of the standard model are considered, such as: {\it i)}
extensions of the fermion sector (right-handed neutrino); {\it ii)} minimal
extensions involving additional Higgs scalars (more than one isodoublets,
singly and doubly charged isosinglets, isotriplets with doubly charged members
etc.); {\it iii)} supersymmetric or superstring inspired unified models
emphasizing the implications of the renormalization group equations in the
leptonic sector. Special attention is given to the experimentaly most
interesting $(\mu - e)$ conversion in the presence of nuclei. The relevant
nuclear aspects of the amplitudes are discussed in a number of fashionable
nuclear models. The main features of the relevant experiments are also
discussed, and detailed predictions of the above models are compared to the
present experimental limits.
| [
{
"created": "Fri, 3 Dec 1993 14:46:00 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Kosmas",
"T. S.",
""
],
[
"Leontaris",
"G. K.",
""
],
[
"Vergados",
"J. D.",
""
]
] | In the present work we review the most prominent lepton flavor violating processes ($\mu \ra e\gamma$, $\mu \ra 3e$, $(\mu , e)$ conversion, $M-\bar M$ oscillations etc), in the context of unified gauge theories. Many currently fashionable extensions of the standard model are considered, such as: {\it i)} extensions of the fermion sector (right-handed neutrino); {\it ii)} minimal extensions involving additional Higgs scalars (more than one isodoublets, singly and doubly charged isosinglets, isotriplets with doubly charged members etc.); {\it iii)} supersymmetric or superstring inspired unified models emphasizing the implications of the renormalization group equations in the leptonic sector. Special attention is given to the experimentaly most interesting $(\mu - e)$ conversion in the presence of nuclei. The relevant nuclear aspects of the amplitudes are discussed in a number of fashionable nuclear models. The main features of the relevant experiments are also discussed, and detailed predictions of the above models are compared to the present experimental limits. |
1607.02718 | C. Q. Geng | Y.K. Hsiao and C.Q. Geng | Branching fractions of $B_{(c)}$ decays involving $J/\psi$ and $X(3872)$ | 8 pages, 2 figures | Chinese Physics C41, 013101 (2017) | 10.1088/1674-1137/41/1/013101 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study two-body $B_{(c)}\to M_c(\pi,K)$ and semileptonic $B_{c}\to
M_c\ell^-\bar \nu_\ell$ decays with $M_c=(J/\psi,X_c^0)$, where $X_c^0\equiv
X^0(3872)$ is regarded as the tetraquark state of $c\bar cu\bar u(d\bar d)$.
With the decay constant $f_{X_c^0}=(234\pm 52)$~MeV determined from the data,
we predict that ${\cal B}(B^-\to X_c^0\pi^-)=(11.5\pm 5.7)\times 10^{-6}$,
${\cal B}(\bar B^0\to X_c^0\bar K^0)=(2.1\pm 1.0)\times 10^{-4}$, and ${\cal
B}(\bar B^0_s\to X_c^0\bar K^0)=(11.4\pm 5.6)\times 10^{-6}$. With the form
factors in QCD models, we calculate that ${\cal B}(B_c^-\to X_c^0\pi^-,X_c^0
K^-)=(6.0\pm 2.6)\times 10^{-5}$ and $(4.7\pm 2.0)\times 10^{-6}$, and ${\cal
B}(B_c^-\to J/\psi \mu^-\bar \nu_\mu, X_c^0 \mu^-\bar \nu_\mu
)=(2.3\pm0.6)\times 10^{-2}$ and $(1.35\pm 0.18)\times 10^{-3}$, respectively,
and extract the ratio of the fragmentation fractions to be $f_c/f_u=(6.4\pm
1.9)\times 10^{-3}$.
| [
{
"created": "Sun, 10 Jul 2016 09:01:41 GMT",
"version": "v1"
}
] | 2017-01-17 | [
[
"Hsiao",
"Y. K.",
""
],
[
"Geng",
"C. Q.",
""
]
] | We study two-body $B_{(c)}\to M_c(\pi,K)$ and semileptonic $B_{c}\to M_c\ell^-\bar \nu_\ell$ decays with $M_c=(J/\psi,X_c^0)$, where $X_c^0\equiv X^0(3872)$ is regarded as the tetraquark state of $c\bar cu\bar u(d\bar d)$. With the decay constant $f_{X_c^0}=(234\pm 52)$~MeV determined from the data, we predict that ${\cal B}(B^-\to X_c^0\pi^-)=(11.5\pm 5.7)\times 10^{-6}$, ${\cal B}(\bar B^0\to X_c^0\bar K^0)=(2.1\pm 1.0)\times 10^{-4}$, and ${\cal B}(\bar B^0_s\to X_c^0\bar K^0)=(11.4\pm 5.6)\times 10^{-6}$. With the form factors in QCD models, we calculate that ${\cal B}(B_c^-\to X_c^0\pi^-,X_c^0 K^-)=(6.0\pm 2.6)\times 10^{-5}$ and $(4.7\pm 2.0)\times 10^{-6}$, and ${\cal B}(B_c^-\to J/\psi \mu^-\bar \nu_\mu, X_c^0 \mu^-\bar \nu_\mu )=(2.3\pm0.6)\times 10^{-2}$ and $(1.35\pm 0.18)\times 10^{-3}$, respectively, and extract the ratio of the fragmentation fractions to be $f_c/f_u=(6.4\pm 1.9)\times 10^{-3}$. |
hep-ph/9508260 | Michelangelo Mangano | Michelangelo L. Mangano (CERN) | Heavy Quark Production In Hadronic Collisions | 12 pages, latex, 7 postscript figures, compressed and submitted
separately. To appear in the Proceedings of the 6th International Symposium
on Heavy Flavour Physics, Pisa, Italy, June 6-10, 1995 | Nuovo Cim.A109:683-694,1996 | 10.1007/BF02731702 | CERN-TH/95-191 | hep-ph | null | We review the physics of heavy quark and quarkonium production in high energy
hadronic collisions. We discuss the status of the theoretical calculations and
compare the current results with the most recent measurements from the Tevatron
collider experiments.
| [
{
"created": "Tue, 8 Aug 1995 11:36:09 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Mangano",
"Michelangelo L.",
"",
"CERN"
]
] | We review the physics of heavy quark and quarkonium production in high energy hadronic collisions. We discuss the status of the theoretical calculations and compare the current results with the most recent measurements from the Tevatron collider experiments. |
2112.09979 | Adrian Thompson | A.A. Aguilar-Arevalo, D.S.M. Alves, S. Biedron, J. Boissevain, M.
Borrego, L. Bugel, M. Chavez-Estrada, J.M. Conrad, R.L. Cooper, A. Diaz, J.R.
Distel, J.C. D'Olivo, E. Dunton, B. Dutta, D. Fields, J.R. Gochanour, M.
Gold, E. Guardincerri, E.C. Huang, N. Kamp, D. Kim, K. Knickerbocker, W.C.
Louis, J.T.M. Lyles, R. Mahapatra, S. Maludze, J. Mirabal, N. Mishra, D.
Newmark, P. deNiverville, V. Pandey, D. Poulson, H. Ray, E. Renner, T.J.
Schaub, A. Schneider, M.H. Shaevitz, D. Smith, W. Sondheim, A.M. Szelc, C.
Taylor, A. Thompson, W.H. Thompson, M. Tripathi, R.T. Thornton, R. Van Berg,
R.G. Van de Water, and S. Verma | Prospects for detecting axionlike particles at the Coherent
CAPTAIN-Mills experiment | Accepted for publication in Physical Review D, in production | Phys.Rev.D 107 (2023) 9, 095036 | 10.1103/PhysRevD.107.095036 | LA-UR-21-28474 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We show results from the Coherent CAPTAIN Mills (CCM) 2019 engineering run
which begin to constrain regions of parameter space for axion-like particles
(ALPs) produced in electromagnetic particle showers in an 800 MeV proton beam
dump, and further investigate the sensitivity of ongoing data-taking campaigns
for the CCM200 upgraded detector. Based on beam-on background estimates from
the engineering run, we make realistic extrapolations for background reduction
based on expected shielding improvements, reduced beam width, and
analysis-based techniques for background rejection. We obtain reach projections
for two classes of signatures; ALPs coupled primarily to photons can be
produced in the tungsten target via the Primakoff process, and then produce a
gamma-ray signal in the Liquid Argon (LAr) CCM detector either via inverse
Primakoff scattering or decay to a photon pair. ALPs with significant electron
couplings have several additional production mechanisms (Compton scattering,
$e^+e^-$ annihilation, ALP-bremsstrahlung) and detection modes (inverse Compton
scattering, external $e^+e^-$ pair conversion, and decay to $e^+e^-$). In some
regions, the constraint is marginally better than both astrophysical and
terrestrial constraints. With the beginning of a three year run, CCM will be
more sensitive to this parameter space by up to an order of magnitude for both
ALP-photon and ALP-electron couplings. The CCM experiment will also have
sensitivity to well-motivated parameter space of QCD axion models. It is only a
recent realization that accelerator-based large volume liquid argon detectors
designed for low energy coherent neutrino and dark matter scattering searches
are also ideal for probing ALPs in the unexplored $\sim$MeV mass scale.
| [
{
"created": "Sat, 18 Dec 2021 18:01:48 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2022 16:34:22 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Dec 2022 22:31:09 GMT",
"version": "v3"
},
{
"created": "Tue, 2 May 2023 17:21:10 GMT",
"version": "v4"
},
{
"created": "Fri, 26 May 2023 15:50:30 GMT",
"version": "v5"
}
] | 2023-05-29 | [
[
"Aguilar-Arevalo",
"A. A.",
""
],
[
"Alves",
"D. S. M.",
""
],
[
"Biedron",
"S.",
""
],
[
"Boissevain",
"J.",
""
],
[
"Borrego",
"M.",
""
],
[
"Bugel",
"L.",
""
],
[
"Chavez-Estrada",
"M.",
""
],
[
"Conrad",
"J. M.",
""
],
[
"Cooper",
"R. L.",
""
],
[
"Diaz",
"A.",
""
],
[
"Distel",
"J. R.",
""
],
[
"D'Olivo",
"J. C.",
""
],
[
"Dunton",
"E.",
""
],
[
"Dutta",
"B.",
""
],
[
"Fields",
"D.",
""
],
[
"Gochanour",
"J. R.",
""
],
[
"Gold",
"M.",
""
],
[
"Guardincerri",
"E.",
""
],
[
"Huang",
"E. C.",
""
],
[
"Kamp",
"N.",
""
],
[
"Kim",
"D.",
""
],
[
"Knickerbocker",
"K.",
""
],
[
"Louis",
"W. C.",
""
],
[
"Lyles",
"J. T. M.",
""
],
[
"Mahapatra",
"R.",
""
],
[
"Maludze",
"S.",
""
],
[
"Mirabal",
"J.",
""
],
[
"Mishra",
"N.",
""
],
[
"Newmark",
"D.",
""
],
[
"deNiverville",
"P.",
""
],
[
"Pandey",
"V.",
""
],
[
"Poulson",
"D.",
""
],
[
"Ray",
"H.",
""
],
[
"Renner",
"E.",
""
],
[
"Schaub",
"T. J.",
""
],
[
"Schneider",
"A.",
""
],
[
"Shaevitz",
"M. H.",
""
],
[
"Smith",
"D.",
""
],
[
"Sondheim",
"W.",
""
],
[
"Szelc",
"A. M.",
""
],
[
"Taylor",
"C.",
""
],
[
"Thompson",
"A.",
""
],
[
"Thompson",
"W. H.",
""
],
[
"Tripathi",
"M.",
""
],
[
"Thornton",
"R. T.",
""
],
[
"Van Berg",
"R.",
""
],
[
"Van de Water",
"R. G.",
""
],
[
"Verma",
"S.",
""
]
] | We show results from the Coherent CAPTAIN Mills (CCM) 2019 engineering run which begin to constrain regions of parameter space for axion-like particles (ALPs) produced in electromagnetic particle showers in an 800 MeV proton beam dump, and further investigate the sensitivity of ongoing data-taking campaigns for the CCM200 upgraded detector. Based on beam-on background estimates from the engineering run, we make realistic extrapolations for background reduction based on expected shielding improvements, reduced beam width, and analysis-based techniques for background rejection. We obtain reach projections for two classes of signatures; ALPs coupled primarily to photons can be produced in the tungsten target via the Primakoff process, and then produce a gamma-ray signal in the Liquid Argon (LAr) CCM detector either via inverse Primakoff scattering or decay to a photon pair. ALPs with significant electron couplings have several additional production mechanisms (Compton scattering, $e^+e^-$ annihilation, ALP-bremsstrahlung) and detection modes (inverse Compton scattering, external $e^+e^-$ pair conversion, and decay to $e^+e^-$). In some regions, the constraint is marginally better than both astrophysical and terrestrial constraints. With the beginning of a three year run, CCM will be more sensitive to this parameter space by up to an order of magnitude for both ALP-photon and ALP-electron couplings. The CCM experiment will also have sensitivity to well-motivated parameter space of QCD axion models. It is only a recent realization that accelerator-based large volume liquid argon detectors designed for low energy coherent neutrino and dark matter scattering searches are also ideal for probing ALPs in the unexplored $\sim$MeV mass scale. |
hep-ph/9504364 | Stuart Raby | Tomas Blazek, Stuart Raby and Stefan Pokorski | Finite Supersymmetric Threshold Corrections to CKM Matrix Elements in
the Large $tan\beta$ Regime | 15 pages, 3 figures not included; hard copy of the figures may be
obtained upon request | Phys.Rev.D52:4151-4158,1995 | 10.1103/PhysRevD.52.4151 | OHSTPY-HEP-T-95-007 | hep-ph | null | We evaluate the finite 1-loop threshold corrections, proportional to
$tan\beta$, to the down quark mass matrix. These result in corrections to down
quark masses and to Cabibbo-Kobayashi-Maskawa [CKM] matrix elements. The
corrections to CKM matrix elements are the novel feature of this paper. For
grand unified theories with large $\tan\beta$ these corrections may
significantly alter the low energy predictions of four of the CKM matrix
elements and the Jarlskog parameter J, a measure of CP violation. The angles
$\alpha,\: \beta$ and $\gamma$ of the unitarity triangle and the ratio
$|{V_{ub} \over V_{cb}}|$, however, are not corrected to this order. We also
discuss these corrections in the light of recent models for fermion masses.
Here the corrections may be useful in selecting among the various models.
Moreover, if one model fits the data, it will only do so for a particular range
of SUSY parameters.
| [
{
"created": "Sat, 22 Apr 1995 16:36:38 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Blazek",
"Tomas",
""
],
[
"Raby",
"Stuart",
""
],
[
"Pokorski",
"Stefan",
""
]
] | We evaluate the finite 1-loop threshold corrections, proportional to $tan\beta$, to the down quark mass matrix. These result in corrections to down quark masses and to Cabibbo-Kobayashi-Maskawa [CKM] matrix elements. The corrections to CKM matrix elements are the novel feature of this paper. For grand unified theories with large $\tan\beta$ these corrections may significantly alter the low energy predictions of four of the CKM matrix elements and the Jarlskog parameter J, a measure of CP violation. The angles $\alpha,\: \beta$ and $\gamma$ of the unitarity triangle and the ratio $|{V_{ub} \over V_{cb}}|$, however, are not corrected to this order. We also discuss these corrections in the light of recent models for fermion masses. Here the corrections may be useful in selecting among the various models. Moreover, if one model fits the data, it will only do so for a particular range of SUSY parameters. |
hep-ph/9610214 | null | Giovanni Ridolfi | Spin effects in lepton-nucleon scattering: a theoretical overview | 8 pages, LaTeX with procl.sty (included), 1 figure included by psfig.
Summary talk of WG5 at the DIS '96 Workshop, Rome, April 1996 | null | null | null | hep-ph | null | I review recent theoretical results on polarized deep inelastic lepton
nucleon scattering. Some specific issues, like $Q^2$ evolution of structure
functions, the small $x$ behaviour, and the determination of polarized parton
densities, are discussed in some detail.
| [
{
"created": "Wed, 2 Oct 1996 12:48:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ridolfi",
"Giovanni",
""
]
] | I review recent theoretical results on polarized deep inelastic lepton nucleon scattering. Some specific issues, like $Q^2$ evolution of structure functions, the small $x$ behaviour, and the determination of polarized parton densities, are discussed in some detail. |
hep-ph/9606347 | Weimin Zhang | Wei-Min Zhang and A. Harindranath | The transverse polarized structure function in DIS and chiral symmetry
breaking in QCD | 13 pages and one figure | null | null | null | hep-ph | null | We study the polarized structure functions in QCD. We show that $g_T$ which
probes helicity flip interactions in hadrons on the light-front indeed measures
the QCD dynamics of chiral symmetry breaking. The relation between chiral
symmetry breaking and the observed $g_2$ data is explored.
| [
{
"created": "Mon, 17 Jun 1996 16:39:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zhang",
"Wei-Min",
""
],
[
"Harindranath",
"A.",
""
]
] | We study the polarized structure functions in QCD. We show that $g_T$ which probes helicity flip interactions in hadrons on the light-front indeed measures the QCD dynamics of chiral symmetry breaking. The relation between chiral symmetry breaking and the observed $g_2$ data is explored. |
1606.06696 | Wai-Yee Keung | Kingman Cheung, Wai-Yee Keung, and Po-Yan Tseng | Resurgence of $Z'$ from the single electron-muon event at ATLAS | 14 pages, 1 table, 1 figure | Phys. Rev. D 94, 075006 (2016) | 10.1103/PhysRevD.94.075006 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the recent single $e^{\pm}\mu^{\mp}$ event at 2.1 TeV invariant
mass from the ATLAS at $\sqrt{s}=13$ TeV with 3.2 fb$^{-1}$ luminosity, we
propose an explanation using a $Z'$ gauge boson, which possesses
lepton-flavor-changing neutral currents originated from non-universal couplings
to charged leptons. We assume that the left-handed charged-lepton mixing matrix
equals to the PMNS matrix and no mixing in the neutrino sector to make this
phenomenological $Z'$ model more predictive. There are indeed some parameter
regions, where the $Z'$ can generate a large enough $e^{\pm}\mu^{\mp}$
production cross section, while at the same time satisfies various observables
from lepton-flavor violation and other constraints from the LHC.
| [
{
"created": "Tue, 21 Jun 2016 18:40:56 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"Cheung",
"Kingman",
""
],
[
"Keung",
"Wai-Yee",
""
],
[
"Tseng",
"Po-Yan",
""
]
] | Inspired by the recent single $e^{\pm}\mu^{\mp}$ event at 2.1 TeV invariant mass from the ATLAS at $\sqrt{s}=13$ TeV with 3.2 fb$^{-1}$ luminosity, we propose an explanation using a $Z'$ gauge boson, which possesses lepton-flavor-changing neutral currents originated from non-universal couplings to charged leptons. We assume that the left-handed charged-lepton mixing matrix equals to the PMNS matrix and no mixing in the neutrino sector to make this phenomenological $Z'$ model more predictive. There are indeed some parameter regions, where the $Z'$ can generate a large enough $e^{\pm}\mu^{\mp}$ production cross section, while at the same time satisfies various observables from lepton-flavor violation and other constraints from the LHC. |
0811.2051 | Edoardo Mirabella Mr. | E. Mirabella | Electroweak Corrections to t-channel single top production at the LHC | 8 pages, 4 figures. To appear in the proceedings of TOP2008:
International Workshop on Top-Quark Physics, La Biodola, Isola d'Elba, Italy,
18-24 May 2008 | Nuovo Cim.B123:1111-1117,2008 | 10.1393/ncb/i2008-10669-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the computation of the $\mathcal{O}(\alpha^3)$ corrections for
single top (and single anti-top) production in the $t$-channel at hadron
colliders. We show also The genuine one loop SUSY contribution to these
processes. Such contributions are generally quite modest in the mSUGRA
scenario. The experimental observables would therefore only practically depend,
in this framework, on the CKM $Wtb$ coupling.
| [
{
"created": "Thu, 13 Nov 2008 08:54:23 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Mirabella",
"E.",
""
]
] | We describe the computation of the $\mathcal{O}(\alpha^3)$ corrections for single top (and single anti-top) production in the $t$-channel at hadron colliders. We show also The genuine one loop SUSY contribution to these processes. Such contributions are generally quite modest in the mSUGRA scenario. The experimental observables would therefore only practically depend, in this framework, on the CKM $Wtb$ coupling. |
1903.06557 | Patrick Bolton | Patrick D. Bolton and Frank F. Deppisch | Probing nonstandard lepton number violating interactions in neutrino
oscillations | 33 pages, 9 figures | Phys. Rev. D 99, 115011 (2019) | 10.1103/PhysRevD.99.115011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss lepton number violating processes in the context of long-baseline
neutrino oscillations. We summarise and compare neutrino flavour oscillations
in quantum mechanics and quantum field theory, both for standard oscillations
and for those that violate lepton number. When the active neutrinos are
Majorana in nature, the required helicity reversal gives a strong suppression
by the neutrino mass over the energy, $(m_{\nu}/E_{\nu})^{2}$. Instead, the
presence of non-standard lepton number violating interactions incorporating
right-handed lepton currents at production or detection alleviate the mass
suppression while also factorising the oscillation probability from the total
rate. Such interactions arise from dimension-six operators in the low energy
effective field theory of the Standard Model. We derive general and simplified
expressions for the lepton number violating oscillation probabilities and use
limits from MINOS and KamLAND to place bounds on the interaction strength in
interplay with the unknown Majorana phases in neutrino mixing. We compare the
bounds with those from neutrinoless double beta decay and other microscopic
lepton number violating processes and outline the requirements for future
short- and long-baseline neutrino oscillation experiments to improve on the
existing bounds.
| [
{
"created": "Fri, 15 Mar 2019 13:51:43 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2019 15:35:49 GMT",
"version": "v2"
}
] | 2019-06-19 | [
[
"Bolton",
"Patrick D.",
""
],
[
"Deppisch",
"Frank F.",
""
]
] | We discuss lepton number violating processes in the context of long-baseline neutrino oscillations. We summarise and compare neutrino flavour oscillations in quantum mechanics and quantum field theory, both for standard oscillations and for those that violate lepton number. When the active neutrinos are Majorana in nature, the required helicity reversal gives a strong suppression by the neutrino mass over the energy, $(m_{\nu}/E_{\nu})^{2}$. Instead, the presence of non-standard lepton number violating interactions incorporating right-handed lepton currents at production or detection alleviate the mass suppression while also factorising the oscillation probability from the total rate. Such interactions arise from dimension-six operators in the low energy effective field theory of the Standard Model. We derive general and simplified expressions for the lepton number violating oscillation probabilities and use limits from MINOS and KamLAND to place bounds on the interaction strength in interplay with the unknown Majorana phases in neutrino mixing. We compare the bounds with those from neutrinoless double beta decay and other microscopic lepton number violating processes and outline the requirements for future short- and long-baseline neutrino oscillation experiments to improve on the existing bounds. |
1811.04688 | Cheng-Jian Xiao | Cheng-Jian Xiao, Dian-Yong Chen, Yu-Bing Dong, Wei Zuo, Takayuki
Matsuki | Understanding the $\eta_c\rho$ decay mode of $Z_c^{(\prime)}$ via the
triangle loop mechanism | null | Phys. Rev. D 99, 074003 (2019) | 10.1103/PhysRevD.99.074003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the BESIII Collaboration reported a new measurement of the $\eta_c
\rho$ decay mode of $Z_c^{(\prime)}$, which motivated us to study the inner
structure of $Z_c^{(\prime)}$ via investigating the hidden charm decays of
these two $Z_c$ states. We consider the {triangle loop mechanism} contribution
in the hidden charm decays of $Z_c^{(\prime)}$. Our estimations indicate that
the triangle loop mechanism plays an important role in the decays of the
$Z_c^{(\prime)}$, where our results are in agreement with the experimental
observations in a reasonable parameter range. Furthermore, we point out that
the $Z_c^{(\prime)}$ can be interpreted as the hadronic molecules, while the
tetraquark scenario is less favored.
| [
{
"created": "Mon, 12 Nov 2018 12:28:39 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Mar 2019 03:43:14 GMT",
"version": "v2"
}
] | 2019-04-10 | [
[
"Xiao",
"Cheng-Jian",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Dong",
"Yu-Bing",
""
],
[
"Zuo",
"Wei",
""
],
[
"Matsuki",
"Takayuki",
""
]
] | Recently, the BESIII Collaboration reported a new measurement of the $\eta_c \rho$ decay mode of $Z_c^{(\prime)}$, which motivated us to study the inner structure of $Z_c^{(\prime)}$ via investigating the hidden charm decays of these two $Z_c$ states. We consider the {triangle loop mechanism} contribution in the hidden charm decays of $Z_c^{(\prime)}$. Our estimations indicate that the triangle loop mechanism plays an important role in the decays of the $Z_c^{(\prime)}$, where our results are in agreement with the experimental observations in a reasonable parameter range. Furthermore, we point out that the $Z_c^{(\prime)}$ can be interpreted as the hadronic molecules, while the tetraquark scenario is less favored. |
2406.07916 | Guido Bell | Guido Bell, Christopher Lee, Yiannis Makris, Jim Talbert and Bin Yan | Revisiting strong-coupling determinations from $e^+ e^-$ event shapes | 4 pages, 2 figures. Contribution to the 2024 QCD session of the 58th
Rencontres de Moriond | null | null | LA-UR-24-25558, SI-HEP-2024-13, P3H-24-035 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reassess the theoretical uncertainties of strong-coupling determinations
from a global fit to the $e^+ e^-$ thrust data, focusing in particular on the
scheme dependence associated with the applied renormalon-cancellation
prescription and on the choice of scale parameters that are used to estimate
higher-order perturbative corrections in all sectors of the calculation.
| [
{
"created": "Wed, 12 Jun 2024 06:35:49 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Bell",
"Guido",
""
],
[
"Lee",
"Christopher",
""
],
[
"Makris",
"Yiannis",
""
],
[
"Talbert",
"Jim",
""
],
[
"Yan",
"Bin",
""
]
] | We reassess the theoretical uncertainties of strong-coupling determinations from a global fit to the $e^+ e^-$ thrust data, focusing in particular on the scheme dependence associated with the applied renormalon-cancellation prescription and on the choice of scale parameters that are used to estimate higher-order perturbative corrections in all sectors of the calculation. |
hep-ph/0410166 | Marcus M. Weber | M. M. Weber | Precise predictions for Higgs production at e+ e- colliders and
Numerical calculation of one-loop integrals | 15 pages, LaTeX, 4 postscript figures. Talk given at the final
meeting of the European Network "Physics at Colliders", Montpellier,
September 26-27, 2004 | Acta Phys.Polon. B35 (2004) 2655-2669 | null | null | hep-ph | null | Some of the most interesting Higgs-production processes at future e+ e-
colliders are of the type e+ e- -> f anti-f H. We present a calculation of the
complete O(alpha) corrections to these processes in the Standard Model for
final-state neutrinos and top quarks. Initial-state radiation beyond O(alpha)
at the leading-logarithmic level as well as QCD corrections are also included.
The electroweak corrections turn out to be sizable and reach the order of
+/-10% and will thus be an important part of precise theoretical predictions
for future e+ e- colliders.
Furthermore, an overview is given of a technique for a fast and reliable
numerical calculation of multi-leg one-loop integrals. The method is
numerically stable also for exceptional momentum configurations and easily
allows the introduction of complex masses and the calculation of higher orders
in the expansion around D=4.
| [
{
"created": "Tue, 12 Oct 2004 16:04:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Weber",
"M. M.",
""
]
] | Some of the most interesting Higgs-production processes at future e+ e- colliders are of the type e+ e- -> f anti-f H. We present a calculation of the complete O(alpha) corrections to these processes in the Standard Model for final-state neutrinos and top quarks. Initial-state radiation beyond O(alpha) at the leading-logarithmic level as well as QCD corrections are also included. The electroweak corrections turn out to be sizable and reach the order of +/-10% and will thus be an important part of precise theoretical predictions for future e+ e- colliders. Furthermore, an overview is given of a technique for a fast and reliable numerical calculation of multi-leg one-loop integrals. The method is numerically stable also for exceptional momentum configurations and easily allows the introduction of complex masses and the calculation of higher orders in the expansion around D=4. |
1208.4252 | Zhi-Tian Zou | Zhi-Tian Zou, Xin Yu and Cai-Dian Lu | The $B_c\rightarrow D^{(*)}T$ decays in perturbative QCD approach | 24 pages, 1 figures | Physical Review D 87, 074027 (2013) | 10.1103/PhysRevD.87.074027 | CAS-KITPC/ITP-338 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate those $B_{c}\rightarrow D^{(*)}T$ decays in
perturbative QCD approach, based on $k_T$ factorization, where T denotes a
light tensor meson. For all decays considered in this work, there are no
contributions from factorizable emission diagrams because the emitted meson is
the tensor meson. We find that the annihilation amplitudes are dominant in
these decays due to the large Cabibbo-Kobayashi-Maskawa elements, which are
only calculable in the pQCD approach. The numerical results show that the
predictions for the branching ratios of most decays are in the order of
$10^{-6}$ or even bigger, which can be observed in the ongoing experiments. We
also predict large percentage of transverse polarizations in those W
annihilation diagram dominant $B_{c} \rightarrow D^{*}T$ decay channels.
| [
{
"created": "Tue, 21 Aug 2012 12:48:06 GMT",
"version": "v1"
}
] | 2013-09-11 | [
[
"Zou",
"Zhi-Tian",
""
],
[
"Yu",
"Xin",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | In this work, we investigate those $B_{c}\rightarrow D^{(*)}T$ decays in perturbative QCD approach, based on $k_T$ factorization, where T denotes a light tensor meson. For all decays considered in this work, there are no contributions from factorizable emission diagrams because the emitted meson is the tensor meson. We find that the annihilation amplitudes are dominant in these decays due to the large Cabibbo-Kobayashi-Maskawa elements, which are only calculable in the pQCD approach. The numerical results show that the predictions for the branching ratios of most decays are in the order of $10^{-6}$ or even bigger, which can be observed in the ongoing experiments. We also predict large percentage of transverse polarizations in those W annihilation diagram dominant $B_{c} \rightarrow D^{*}T$ decay channels. |
hep-ph/0409040 | Qing-Hong Cao | Qing-Hong Cao, Reinhard Schwienhorst, C.-P. Yuan | Next-to-Leading Order Corrections to Single Top Quark Production and
Decay at the Tevatron: 1. s-channel Process | 39 pages, 37 figures | Phys.Rev.D71:054023,2005 | 10.1103/PhysRevD.71.054023 | MSUHEP-040904 | hep-ph | null | We present a study of s-channel single top quark production at the upgraded
Tevatron $p\bar{p}$ collider, including the next-to-leading order (NLO) QCD
corrections to the production and the decay of the top quark. The "modified"
narrow width approximation was adopted to preserve the spin of the top quark in
its production and decay. We discuss the effect of the different $O(\alpha_s)$
contributions on the inclusive cross section as well as various kinematic
distributions after imposing the relevant cuts to select s-channel single top
signal events. In particular the $O(\alpha_s)$ decay contribution, while small
in size, has a significant impact on several distributions. With the help of
the best-jet algorithm to reconstruct the top quark we demonstrate that it is
possible to study kinematical and spin correlations in s-channel single top
events. We furthermore compare top quark spin measurements in two different
basis and show how NLO corrections have to be taken into consideration in
searches for the Higgs boson through $W^{\pm}H$ associated production at the
Tevatron.
| [
{
"created": "Fri, 3 Sep 2004 19:43:42 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Sep 2004 16:43:44 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Feb 2005 18:55:50 GMT",
"version": "v3"
}
] | 2011-03-23 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Schwienhorst",
"Reinhard",
""
],
[
"Yuan",
"C. -P.",
""
]
] | We present a study of s-channel single top quark production at the upgraded Tevatron $p\bar{p}$ collider, including the next-to-leading order (NLO) QCD corrections to the production and the decay of the top quark. The "modified" narrow width approximation was adopted to preserve the spin of the top quark in its production and decay. We discuss the effect of the different $O(\alpha_s)$ contributions on the inclusive cross section as well as various kinematic distributions after imposing the relevant cuts to select s-channel single top signal events. In particular the $O(\alpha_s)$ decay contribution, while small in size, has a significant impact on several distributions. With the help of the best-jet algorithm to reconstruct the top quark we demonstrate that it is possible to study kinematical and spin correlations in s-channel single top events. We furthermore compare top quark spin measurements in two different basis and show how NLO corrections have to be taken into consideration in searches for the Higgs boson through $W^{\pm}H$ associated production at the Tevatron. |
hep-ph/0103166 | Gerhard Buchalla | Gerhard Buchalla (CERN) | Kaon and Charm Physics: Theory | Lectures presented at TASI 2000, 63 pages, 24 Postscript figures | null | 10.1142/9789812811509_0004 | CERN-TH/2001-041 | hep-ph | null | We introduce and discuss basic topics in the theory of kaons and charmed
particles. In the first part, theoretical methods in weak decays such as
operator product expansion, renormalization group and the construction of
effective Hamiltonians are presented, along with an elementary account of
chiral perturbation theory. The second part describes the phenomenology of the
neutral kaon system, CP violation, $\varepsilon$ and
$\varepsilon'/\varepsilon$, rare kaon decays ($K\to\pi\nu\bar\nu$, $K_L\to\pi^0
e^+e^-$, $K_L\to\mu^+\mu^-$), and some examples of flavour physics in the charm
sector.
| [
{
"created": "Wed, 14 Mar 2001 23:55:45 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Buchalla",
"Gerhard",
"",
"CERN"
]
] | We introduce and discuss basic topics in the theory of kaons and charmed particles. In the first part, theoretical methods in weak decays such as operator product expansion, renormalization group and the construction of effective Hamiltonians are presented, along with an elementary account of chiral perturbation theory. The second part describes the phenomenology of the neutral kaon system, CP violation, $\varepsilon$ and $\varepsilon'/\varepsilon$, rare kaon decays ($K\to\pi\nu\bar\nu$, $K_L\to\pi^0 e^+e^-$, $K_L\to\mu^+\mu^-$), and some examples of flavour physics in the charm sector. |
0812.1826 | Joseph D. Lykken | J.D. Lykken, Z. Murdock, S. Nandi | A light scalar as the messenger of electroweak and flavor symmetry
breaking | 27 pages 10 figures | Phys.Rev.D79:075014,2009 | 10.1103/PhysRevD.79.075014 | FERMILAB-PUB-08-432-T, OSU-HEP-08-08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new framework for understanding the hierarchies of fermion
masses and mixings. The masses and mixings of all Standard Model (SM) charged
fermions other than top arise from higher dimensional operators involving a
messenger scalar S and flavon scalars F_i. The flavons spontaneously break SM
flavor symmetries at around the TeV scale. The SM singlet scalar S couples
directly to the Higgs H and spontaneously breaks another U(1) at the
electroweak scale. At the TeV scale, SM quarks and charged leptons have
renormalizable couplings to S, but not to H or F_i. These couplings involve new
heavy vectorlike fermions. Integrating out these fermions produces a pattern of
higher dimensional operators that reproduce the observed hierarchies of the SM
masses and mixings in terms of powers of the "little hierarchy": the ratio of
the electroweak scale to the flavor-breaking scale.
The framework has important phenomenological implications. Flavor-changing
neutral currents are within experimental limits but D^0 mixing and B_s->mu+mu-
could be close to current sensitivities. The neutral scalar s of the messenger
field mixes with the light Higgs of the SM, which can have strong effects on
Higgs decay branching fractions. The s mass eigenstate may be lighter than the
Higgs, and could be detected at the Tevatron or the LHC.
| [
{
"created": "Wed, 10 Dec 2008 19:59:58 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Lykken",
"J. D.",
""
],
[
"Murdock",
"Z.",
""
],
[
"Nandi",
"S.",
""
]
] | We propose a new framework for understanding the hierarchies of fermion masses and mixings. The masses and mixings of all Standard Model (SM) charged fermions other than top arise from higher dimensional operators involving a messenger scalar S and flavon scalars F_i. The flavons spontaneously break SM flavor symmetries at around the TeV scale. The SM singlet scalar S couples directly to the Higgs H and spontaneously breaks another U(1) at the electroweak scale. At the TeV scale, SM quarks and charged leptons have renormalizable couplings to S, but not to H or F_i. These couplings involve new heavy vectorlike fermions. Integrating out these fermions produces a pattern of higher dimensional operators that reproduce the observed hierarchies of the SM masses and mixings in terms of powers of the "little hierarchy": the ratio of the electroweak scale to the flavor-breaking scale. The framework has important phenomenological implications. Flavor-changing neutral currents are within experimental limits but D^0 mixing and B_s->mu+mu- could be close to current sensitivities. The neutral scalar s of the messenger field mixes with the light Higgs of the SM, which can have strong effects on Higgs decay branching fractions. The s mass eigenstate may be lighter than the Higgs, and could be detected at the Tevatron or the LHC. |
1606.07455 | Xiaonu Xiong | Xiangrui Gao, Yu Jia, LiuJi Li, Xiaonu Xiong | Relativistic correction to gluon fragmentation function into
pseudoscalar quarkonium | 15 pages, 4 figures, 1 table, submitted to Chinese Physics C | null | 10.1088/1674-1137/41/2/023103 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the recent measurements of the $\eta_c$ meson production at LHC,
we investigate the relativistic correction effect for the fragmentation
function of the gluon into $\eta_c$, which constitutes the crucial
nonperturbative elements to understand $\eta_c$ production at high $p_T$.
Employing three distinct methods, we calculate the leading relativistic
correction to the $g\to\eta_c$ fragmentation function in the NRQCD
factorization framework, as well as verify the existing NLO result for the
$c\to \eta_c$ fragmentation function. We also study the evolution behavior of
these fragmentation functions with the aid of DGLAP equation.
| [
{
"created": "Thu, 23 Jun 2016 20:02:17 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Gao",
"Xiangrui",
""
],
[
"Jia",
"Yu",
""
],
[
"Li",
"LiuJi",
""
],
[
"Xiong",
"Xiaonu",
""
]
] | Inspired by the recent measurements of the $\eta_c$ meson production at LHC, we investigate the relativistic correction effect for the fragmentation function of the gluon into $\eta_c$, which constitutes the crucial nonperturbative elements to understand $\eta_c$ production at high $p_T$. Employing three distinct methods, we calculate the leading relativistic correction to the $g\to\eta_c$ fragmentation function in the NRQCD factorization framework, as well as verify the existing NLO result for the $c\to \eta_c$ fragmentation function. We also study the evolution behavior of these fragmentation functions with the aid of DGLAP equation. |
1307.1477 | Ben O'Leary | J. E. Camargo-Molina, B. O'Leary, W. Porod, F. Staub | Vevacious: A Tool For Finding The Global Minima Of One-Loop Effective
Potentials With Many Scalars | 44 pages, 1 figure, manual for publicly available software, v2
corresponds to version accepted for publication in EPJC [clearer explanation
of scale dependence and region of validity, explicit mention that SLHA files
should have blocks matching those expected by model files, updated
references] | Eur. Phys. J. C73, 2588 (2013) | 10.1140/epjc/s10052-013-2588-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several extensions of the Standard Model of particle physics contain
additional scalars implying a more complex scalar potential compared to that of
the Standard Model. In general these potentials allow for charge and/or color
breaking minima besides the desired one with correctly broken SU(2)_L times
U(1)_Y . Even if one assumes that a metastable local minimum is realized, one
has to ensure that its lifetime exceeds that of our universe. We introduce a
new program called Vevacious which takes a generic expression for a one-loop
effective potential energy function and finds all the tree-level extrema, which
are then used as the starting points for gradient-based minimization of the
one-loop effective potential. The tunneling time from a given input vacuum to
the deepest minimum, if different from the input vacuum, can be calculated. The
parameter points are given as files in the SLHA format (though is not
restricted to supersymmetric models), and new model files can be easily
generated automatically by the Mathematica package SARAH. This code uses
HOM4PS2 to find all the minima of the tree-level potential, PyMinuit to follow
gradients to the minima of the one-loop potential, and CosmoTransitions to
calculate tunneling times.
| [
{
"created": "Thu, 4 Jul 2013 20:01:16 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Oct 2013 08:44:33 GMT",
"version": "v2"
}
] | 2013-10-22 | [
[
"Camargo-Molina",
"J. E.",
""
],
[
"O'Leary",
"B.",
""
],
[
"Porod",
"W.",
""
],
[
"Staub",
"F.",
""
]
] | Several extensions of the Standard Model of particle physics contain additional scalars implying a more complex scalar potential compared to that of the Standard Model. In general these potentials allow for charge and/or color breaking minima besides the desired one with correctly broken SU(2)_L times U(1)_Y . Even if one assumes that a metastable local minimum is realized, one has to ensure that its lifetime exceeds that of our universe. We introduce a new program called Vevacious which takes a generic expression for a one-loop effective potential energy function and finds all the tree-level extrema, which are then used as the starting points for gradient-based minimization of the one-loop effective potential. The tunneling time from a given input vacuum to the deepest minimum, if different from the input vacuum, can be calculated. The parameter points are given as files in the SLHA format (though is not restricted to supersymmetric models), and new model files can be easily generated automatically by the Mathematica package SARAH. This code uses HOM4PS2 to find all the minima of the tree-level potential, PyMinuit to follow gradients to the minima of the one-loop potential, and CosmoTransitions to calculate tunneling times. |
hep-ph/9601348 | Ariel Zhitnitsky | Ariel R. Zhitnitsky (UBC, Canada) | Effective Field Theories as Asymptotic Series: From QCD to Cosmology | 19 pages | null | null | null | hep-ph gr-qc hep-th | null | We present some generic arguments demonstrating that an effective Lagrangian
$L_{eff}$ which, by definition, contains operators $O^n$ of arbitrary
dimensionality in general is not convergent, but rather an asymptotic series.
It means that the behavior of the far distant terms has a specific factorial
dependence $L_{eff}\sim \sum_n \frac{c_n O^n}{M^{n}},~c_n\sim n! ,~n\gg1$. We
discuss a few apparently different problems, which however have something in
common-- the aforementioned $n!-$ behavior:
1.Effective long -distance theory describing the collective fields in QCD;
2.Effective Berry phase potential which is obtained by integrating over the
fast degrees of freedom. As is known, the Berry potential is associated with
induced local gauge symmetry and might be relevant for the compactification
problem at the Planck scale.
3.Nonlocal Lagrangians introduced by Georgi\cite{Georgi} for appropriate
treatment of the effective field theories without power expanding.
4.The so-called improved action in lattice field theory where the new, higher
dimensional operators have been introduced into the theory in order to reduce
the lattice artifacts.
5.Cosmological constant problem and vacuum expectation values in gravity. We
discuss some applications of this, seemingly pure academic phenomenon, to
various physical problems with typical energies from $1 GeV$ to the Plank
scale.
| [
{
"created": "Fri, 26 Jan 1996 20:19:57 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Zhitnitsky",
"Ariel R.",
"",
"UBC, Canada"
]
] | We present some generic arguments demonstrating that an effective Lagrangian $L_{eff}$ which, by definition, contains operators $O^n$ of arbitrary dimensionality in general is not convergent, but rather an asymptotic series. It means that the behavior of the far distant terms has a specific factorial dependence $L_{eff}\sim \sum_n \frac{c_n O^n}{M^{n}},~c_n\sim n! ,~n\gg1$. We discuss a few apparently different problems, which however have something in common-- the aforementioned $n!-$ behavior: 1.Effective long -distance theory describing the collective fields in QCD; 2.Effective Berry phase potential which is obtained by integrating over the fast degrees of freedom. As is known, the Berry potential is associated with induced local gauge symmetry and might be relevant for the compactification problem at the Planck scale. 3.Nonlocal Lagrangians introduced by Georgi\cite{Georgi} for appropriate treatment of the effective field theories without power expanding. 4.The so-called improved action in lattice field theory where the new, higher dimensional operators have been introduced into the theory in order to reduce the lattice artifacts. 5.Cosmological constant problem and vacuum expectation values in gravity. We discuss some applications of this, seemingly pure academic phenomenon, to various physical problems with typical energies from $1 GeV$ to the Plank scale. |
hep-ph/0605097 | Gurpreet Sidana | Gurpreet Sidana | Two-body non-leptonic decays of lambda_b | 18 pages | null | null | null | hep-ph | null | Two body non-leptonic decays: are investigated. Baryon form factors of the
heavy quark effective theory are employed. Form factors for renormalization in
full QCD are also considered. We find that contributions of the
non-factorizable terms are negligible in b-decays. Comparison with calculations
in other models shows that form factors for renormalization in full QCD should
be more relevant. The asymmetry parameters are negative as in the charmed
baryons cases. An experimental measure on the form factors V1 and A1 is
accentuated to test the validity of HQET.
| [
{
"created": "Tue, 9 May 2006 10:39:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sidana",
"Gurpreet",
""
]
] | Two body non-leptonic decays: are investigated. Baryon form factors of the heavy quark effective theory are employed. Form factors for renormalization in full QCD are also considered. We find that contributions of the non-factorizable terms are negligible in b-decays. Comparison with calculations in other models shows that form factors for renormalization in full QCD should be more relevant. The asymmetry parameters are negative as in the charmed baryons cases. An experimental measure on the form factors V1 and A1 is accentuated to test the validity of HQET. |
1012.2982 | Ana M. Teixeira | A. M. Teixeira, A. Abada, A. J. R. Figueiredo and J. C. Romao | Phenomenology of LFV at low-energies and at the LHC: strategies to probe
the SUSY seesaw | 6 pages, 4 figures. To appear in the proceedings of the 11th
International Workshop on Tau Lepton Physics (TAU2010), Manchester, UK, 13-17
September 2010 | Nucl.Phys.Proc.Suppl. 218 (2011) 50-55 | 10.1016/j.nuclphysbps.2011.06.010 | PCCF RI 1006 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of a type-I SUSY seesaw concerning lepton flavour
violation (LFV) at low-energies and at the LHC. At the LHC, $ \chi_2^0\to
\tilde \ell \,\ell \to \ell \,\ell\,\chi_1^0$ decays, in combination with other
observables, render feasible the reconstruction of the masses of the
intermediate sleptons, and hence the study of $\ell_i - \ell_j$ mass
differences. If interpreted as being due to the violation of lepton flavour,
high-energy observables, such as large slepton mass splittings and flavour
violating neutralino and slepton decays, are expected to be accompanied by
low-energy manifestations of LFV such as radiative and three-body lepton
decays. We discuss how to devise strategies based in the interplay of slepton
mass splittings as might be observed at the LHC and low-energy LFV observables
to derive important information on the underlying mechanism of LFV.
| [
{
"created": "Tue, 14 Dec 2010 10:16:47 GMT",
"version": "v1"
}
] | 2015-03-03 | [
[
"Teixeira",
"A. M.",
""
],
[
"Abada",
"A.",
""
],
[
"Figueiredo",
"A. J. R.",
""
],
[
"Romao",
"J. C.",
""
]
] | We study the impact of a type-I SUSY seesaw concerning lepton flavour violation (LFV) at low-energies and at the LHC. At the LHC, $ \chi_2^0\to \tilde \ell \,\ell \to \ell \,\ell\,\chi_1^0$ decays, in combination with other observables, render feasible the reconstruction of the masses of the intermediate sleptons, and hence the study of $\ell_i - \ell_j$ mass differences. If interpreted as being due to the violation of lepton flavour, high-energy observables, such as large slepton mass splittings and flavour violating neutralino and slepton decays, are expected to be accompanied by low-energy manifestations of LFV such as radiative and three-body lepton decays. We discuss how to devise strategies based in the interplay of slepton mass splittings as might be observed at the LHC and low-energy LFV observables to derive important information on the underlying mechanism of LFV. |
hep-ph/9607399 | Krzysztof Golec-Biernat | K.Golec-Biernat and J.Kwiecinski | Subleading Reggeons in Deep Inelastic Diffractive Scattering at HERA | 6 pages, LaTEX, 1 eps figure | Phys.Rev.D55:3209-3211,1997 | 10.1103/PhysRevD.55.3209 | INP-1734/PH | hep-ph | null | The contribution of subleading reggeons to the diffractive structure function
${dF_{2}^D / dx_{\funp} dt}$ is estimated from the soft physics data. This
contribution leads in a natural way to the violation of the factorization
property of the diffractive structure function.
| [
{
"created": "Tue, 23 Jul 1996 13:13:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Golec-Biernat",
"K.",
""
],
[
"Kwiecinski",
"J.",
""
]
] | The contribution of subleading reggeons to the diffractive structure function ${dF_{2}^D / dx_{\funp} dt}$ is estimated from the soft physics data. This contribution leads in a natural way to the violation of the factorization property of the diffractive structure function. |
1709.07852 | Thomas Wilkason | Peter W. Graham, David E. Kaplan, Jeremy Mardon, Surjeet Rajendran,
William A. Terrano, Lutz Trahms, and Thomas Wilkason | Spin Precession Experiments for Light Axionic Dark Matter | 19 pages, 4 figures | Phys. Rev. D 97, 055006 (2018) | 10.1103/PhysRevD.97.055006 | null | hep-ph astro-ph.CO hep-ex physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axion-like particles are promising candidates to make up the dark matter of
the universe, but it is challenging to design experiments that can detect them
over their entire allowed mass range. Dark matter in general, and in particular
axion-like particles and hidden photons, can be as light as roughly $10^{-22}
\;\rm{eV}$ ($\sim 10^{-8} \;\rm{Hz}$), with astrophysical anomalies providing
motivation for the lightest masses ("fuzzy dark matter"). We propose
experimental techniques for direct detection of axion-like dark matter in the
mass range from roughly $10^{-13} \;\rm{eV}$ ($\sim 10^2 \;\rm{Hz}$) down to
the lowest possible masses. In this range, these axion-like particles act as a
time-oscillating magnetic field coupling only to spin, inducing effects such as
a time-oscillating torque and periodic variations in the spin-precession
frequency with the frequency and direction set by fundamental physics. We show
how these signals can be measured using existing experimental technology,
including torsion pendulums, atomic magnetometers, and atom interferometry.
These experiments demonstrate a strong discovery capability, with future
iterations of these experiments capable of pushing several orders of magnitude
past current astrophysical bounds.
| [
{
"created": "Fri, 22 Sep 2017 17:08:52 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Apr 2018 17:58:49 GMT",
"version": "v2"
}
] | 2018-04-30 | [
[
"Graham",
"Peter W.",
""
],
[
"Kaplan",
"David E.",
""
],
[
"Mardon",
"Jeremy",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Terrano",
"William A.",
""
],
[
"Trahms",
"Lutz",
""
],
[
"Wilkason",
"Thomas",
""
]
] | Axion-like particles are promising candidates to make up the dark matter of the universe, but it is challenging to design experiments that can detect them over their entire allowed mass range. Dark matter in general, and in particular axion-like particles and hidden photons, can be as light as roughly $10^{-22} \;\rm{eV}$ ($\sim 10^{-8} \;\rm{Hz}$), with astrophysical anomalies providing motivation for the lightest masses ("fuzzy dark matter"). We propose experimental techniques for direct detection of axion-like dark matter in the mass range from roughly $10^{-13} \;\rm{eV}$ ($\sim 10^2 \;\rm{Hz}$) down to the lowest possible masses. In this range, these axion-like particles act as a time-oscillating magnetic field coupling only to spin, inducing effects such as a time-oscillating torque and periodic variations in the spin-precession frequency with the frequency and direction set by fundamental physics. We show how these signals can be measured using existing experimental technology, including torsion pendulums, atomic magnetometers, and atom interferometry. These experiments demonstrate a strong discovery capability, with future iterations of these experiments capable of pushing several orders of magnitude past current astrophysical bounds. |
hep-ph/0602249 | Paul Romatschke | Rudolf Baier, Paul Romatschke and Urs Achim Wiedemann | Dissipative Hydrodynamics and Heavy Ion Collisions | 18 pages, 5 figures, uses revtex4; v2: references added, typos
corrected | Phys.Rev.C73:064903,2006 | 10.1103/PhysRevC.73.064903 | BI-TP 2006/04; RBRC 589 | hep-ph nucl-ex nucl-th | null | Recent discussions of RHIC data emphasized the exciting possibility that the
matter produced in nucleus-nucleus collisions shows properties of a
near-perfect fluid. Here, we aim at delineating the applicability of fluid
dynamics, which is needed to quantify the size of corresponding dissipative
effects. We start from the equations for dissipative fluid dynamics, which we
derive from kinetic theory up to second order (Israel-Stewart theory) in a
systematic gradient expansion. In model studies, we then establish that for too
early initialization of the hydrodynamic evolution ($\tau_0 \lsim 1$ fm/c) or
for too high transverse momentum ($p_T \gsim 1$ GeV) in the final state, the
expected dissipative corrections are too large for a fluid description to be
reliable. Moreover, viscosity-induced modifications of hadronic transverse
momentum spectra can be accommodated to a significant degree in an ideal fluid
description by modifications of the decoupling stage. We argue that these
conclusions, drawn from model studies, can also be expected to arise in
significantly more complex, realistic fluid dynamics simulations of heavy ion
collisions.
| [
{
"created": "Tue, 28 Feb 2006 16:53:40 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2006 09:52:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Baier",
"Rudolf",
""
],
[
"Romatschke",
"Paul",
""
],
[
"Wiedemann",
"Urs Achim",
""
]
] | Recent discussions of RHIC data emphasized the exciting possibility that the matter produced in nucleus-nucleus collisions shows properties of a near-perfect fluid. Here, we aim at delineating the applicability of fluid dynamics, which is needed to quantify the size of corresponding dissipative effects. We start from the equations for dissipative fluid dynamics, which we derive from kinetic theory up to second order (Israel-Stewart theory) in a systematic gradient expansion. In model studies, we then establish that for too early initialization of the hydrodynamic evolution ($\tau_0 \lsim 1$ fm/c) or for too high transverse momentum ($p_T \gsim 1$ GeV) in the final state, the expected dissipative corrections are too large for a fluid description to be reliable. Moreover, viscosity-induced modifications of hadronic transverse momentum spectra can be accommodated to a significant degree in an ideal fluid description by modifications of the decoupling stage. We argue that these conclusions, drawn from model studies, can also be expected to arise in significantly more complex, realistic fluid dynamics simulations of heavy ion collisions. |
2102.10060 | Philipp B\"oer | Martin Beneke, Philipp B\"oer, Panagiotis Rigatos and Kimberley Keri
Vos | QCD factorization of the four-lepton decay $B^-\rightarrow \ell
\bar{\nu}_\ell \ell^{(\prime)} \bar{\ell}^{(\prime)}$ | 22 pages, 7 figures; v2: study of the sensitivity to the shape of the
B-LCDA added (Sec. 4.4). Matches published version | Eur. Phys. J. C 81, 638 (2021) | 10.1140/epjc/s10052-021-09388-y | TUM-HEP-1317/21, Nikhef-2021-009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the first search for the rare charged-current $B$ decay to four
leptons, $\ell \bar{\nu}_\ell \ell^{(\prime)} \bar{\ell}^{(\prime)}$, we
calculate the decay amplitude with factorization methods. We obtain the $B\to
\gamma^*$ form factors, which depend on the invariant masses of the two lepton
pairs, at leading power in an expansion in $\Lambda_{\rm QCD}/m_b$ to
next-to-leading order in $\alpha_s$, and at $\mathcal{O}(\alpha_s^0)$ at
next-to-leading power. Our calculations predict branching fractions of a few
times $10^{-8}$ in the $\ell^{(\prime)} \bar{\ell}^{(\prime)}$ mass-squared bin
up to $q^2=1~\text{GeV}^2$ with $n_+q>3~$GeV. The branching fraction rapidly
drops with increasing $q^2$. An important further motivation for this
investigation has been to explore the sensitivity of the decay rate to the
inverse moment $\lambda_B$ of the leading-twist $B$ meson light-cone
distribution amplitude. We find that in the small-$q^2$ bin, the sensitivity to
$\lambda_B$ is almost comparable to $B^- \rightarrow \ell^-
\bar{\nu}_\ell\gamma$ when $\lambda_B$ is small, but with an added uncertainty
from the light-meson intermediate resonance contribution. The sensitivity
degrades with larger $q^2$.
| [
{
"created": "Fri, 19 Feb 2021 17:42:05 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 2021 12:44:06 GMT",
"version": "v2"
}
] | 2021-07-27 | [
[
"Beneke",
"Martin",
""
],
[
"Böer",
"Philipp",
""
],
[
"Rigatos",
"Panagiotis",
""
],
[
"Vos",
"Kimberley Keri",
""
]
] | Motivated by the first search for the rare charged-current $B$ decay to four leptons, $\ell \bar{\nu}_\ell \ell^{(\prime)} \bar{\ell}^{(\prime)}$, we calculate the decay amplitude with factorization methods. We obtain the $B\to \gamma^*$ form factors, which depend on the invariant masses of the two lepton pairs, at leading power in an expansion in $\Lambda_{\rm QCD}/m_b$ to next-to-leading order in $\alpha_s$, and at $\mathcal{O}(\alpha_s^0)$ at next-to-leading power. Our calculations predict branching fractions of a few times $10^{-8}$ in the $\ell^{(\prime)} \bar{\ell}^{(\prime)}$ mass-squared bin up to $q^2=1~\text{GeV}^2$ with $n_+q>3~$GeV. The branching fraction rapidly drops with increasing $q^2$. An important further motivation for this investigation has been to explore the sensitivity of the decay rate to the inverse moment $\lambda_B$ of the leading-twist $B$ meson light-cone distribution amplitude. We find that in the small-$q^2$ bin, the sensitivity to $\lambda_B$ is almost comparable to $B^- \rightarrow \ell^- \bar{\nu}_\ell\gamma$ when $\lambda_B$ is small, but with an added uncertainty from the light-meson intermediate resonance contribution. The sensitivity degrades with larger $q^2$. |
hep-ph/9505265 | null | N.Brambilla and G.M. Prosperi (University of Milan) | Confining Bethe--Salpeter equation in QCD | 5 pages, Latex, talk given at the workshop CONFINEMENT95, 22-24
March, Osaka | null | 10.1142/9789814447140_0019 | null | hep-ph | null | We derive a confining $ q \bar{q}$ Bethe--Salpeter equation starting from the
same assumptions on the Wilson loop integral already adopted in the derivation
of a semirelativistic heavy quark potential. We show that, by standard
approximations, an effective meson squared mass operator can be obtained from
our BS kernel and that, from this, by ${1\over m^2}$ expansion, the
corresponding Wilson loop potential is recovered, spin--dependent and
velocity--dependent terms included. We also show, that, on the contrary,
neglecting spin--dependent terms, relativistic flux tube model is reproduced.
| [
{
"created": "Tue, 9 May 1995 15:39:06 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Brambilla",
"N.",
"",
"University of Milan"
],
[
"Prosperi",
"G. M.",
"",
"University of Milan"
]
] | We derive a confining $ q \bar{q}$ Bethe--Salpeter equation starting from the same assumptions on the Wilson loop integral already adopted in the derivation of a semirelativistic heavy quark potential. We show that, by standard approximations, an effective meson squared mass operator can be obtained from our BS kernel and that, from this, by ${1\over m^2}$ expansion, the corresponding Wilson loop potential is recovered, spin--dependent and velocity--dependent terms included. We also show, that, on the contrary, neglecting spin--dependent terms, relativistic flux tube model is reproduced. |
1012.2288 | Ahmed Ali | Ahmed Ali (DESY) and Gustav Kramer (Univ. Hamburg) | Jets and QCD: A Historical Review of the Discovery of the Quark and
Gluon Jets and its Impact on QCD | 84 pages, 48 figures; Typos corrected, text and the list of
references extended; Invited article, published in Eur. Phys. J. H
(Perspectives on Contemporary Physics) | Eur. Phys. J. H 36, 245 - 326 (2011) | 10.1140/epjh/e2011-10047-1 | DESY-10-215 | hep-ph hep-ex physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of quark and gluon jets has played a crucial role in
establishing Quantum Chromodynamics [QCD] as the theory of the strong
interactions within the Standard Model of particle physics. The jets, narrowly
collimated bundles of hadrons, reflect configurations of quarks and gluons at
short distances. Thus, by analysing energy and angular distributions of the
jets experimentally, the properties of the basic constituents of matter and the
strong forces acting between them can be explored. In this review, which is
primarily a description of the discovery of the quark and gluon jets and the
impact of their observation on Quantum Chromodynamics, we elaborate, in
particular, the role of the gluons as the carriers of the strong force.
Focusing on these basic points, jets in $e^+ e^-$ collisions will be in the
foreground of the discussion and we will concentrate on the theory that was
contemporary with the relevant experiments at the electron-positron colliders.
In addition we will delineate the role of jets as tools for exploring other
particle aspects in $ep$ and $pp/p\bar{p}$ collisions - quark and gluon
densities in protons, measurements of the QCD coupling, fundamental 2-2
quark/gluon scattering processes, but also the impact of jet decays of top
quarks, and $W^\pm, Z$ bosons on the electroweak sector. The presentation to a
large extent is formulated in a non-technical language with the intent to
recall the significant steps historically and convey the significance of this
field also to communities beyond high energy physics.
| [
{
"created": "Thu, 9 Dec 2010 14:55:39 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2011 17:42:35 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Ali",
"Ahmed",
"",
"DESY"
],
[
"Kramer",
"Gustav",
"",
"Univ. Hamburg"
]
] | The observation of quark and gluon jets has played a crucial role in establishing Quantum Chromodynamics [QCD] as the theory of the strong interactions within the Standard Model of particle physics. The jets, narrowly collimated bundles of hadrons, reflect configurations of quarks and gluons at short distances. Thus, by analysing energy and angular distributions of the jets experimentally, the properties of the basic constituents of matter and the strong forces acting between them can be explored. In this review, which is primarily a description of the discovery of the quark and gluon jets and the impact of their observation on Quantum Chromodynamics, we elaborate, in particular, the role of the gluons as the carriers of the strong force. Focusing on these basic points, jets in $e^+ e^-$ collisions will be in the foreground of the discussion and we will concentrate on the theory that was contemporary with the relevant experiments at the electron-positron colliders. In addition we will delineate the role of jets as tools for exploring other particle aspects in $ep$ and $pp/p\bar{p}$ collisions - quark and gluon densities in protons, measurements of the QCD coupling, fundamental 2-2 quark/gluon scattering processes, but also the impact of jet decays of top quarks, and $W^\pm, Z$ bosons on the electroweak sector. The presentation to a large extent is formulated in a non-technical language with the intent to recall the significant steps historically and convey the significance of this field also to communities beyond high energy physics. |
2010.00900 | Ying Chen | Ying Chen | The Origin of Hadron Masses | 5 pages, 3 figures, 2 tables. Comments are welcome. Typos corrected,
references updated. Submitted to Chin. Phys. C | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The color confinement can be decently explained by assuming the global
$SU(3)$ color symmetry. A hadron is viewed as a bag of a finite size, whose
energy is contributed by the color fields within the hadron. In the large
momentum frame, the mass of a hadron can be quantized and can be expressed as
the sum of the current masses of quarks involved plus a flavor independent term
which depends on a universal parameter and can be identified to be the
contribution from the QCD trace anomaly. This term depicts the Regge's
trajectories of light hadron masses, from which the parameter can be determined
and gives the minimal vector meson mass and baryon mass to be 761 MeV and 935
MeV, respectively. The mass formula can explain many features of the hadron
spectroscopy.
| [
{
"created": "Fri, 2 Oct 2020 10:01:03 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2020 04:59:46 GMT",
"version": "v2"
}
] | 2020-10-19 | [
[
"Chen",
"Ying",
""
]
] | The color confinement can be decently explained by assuming the global $SU(3)$ color symmetry. A hadron is viewed as a bag of a finite size, whose energy is contributed by the color fields within the hadron. In the large momentum frame, the mass of a hadron can be quantized and can be expressed as the sum of the current masses of quarks involved plus a flavor independent term which depends on a universal parameter and can be identified to be the contribution from the QCD trace anomaly. This term depicts the Regge's trajectories of light hadron masses, from which the parameter can be determined and gives the minimal vector meson mass and baryon mass to be 761 MeV and 935 MeV, respectively. The mass formula can explain many features of the hadron spectroscopy. |
1604.08099 | Arcadi Santamaria | Dipankar Das and Arcadi Santamaria | Updated scalar sector constraints in Higgs triplet model | Updated references | Phys. Rev. D 94, 015015 (2016) | 10.1103/PhysRevD.94.015015 | FTUV-16-0426, IFIC-16-14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in the Higgs triplet model, after the Higgs discovery, the
mixing angle in the CP-even sector can be strongly constrained from unitarity.
We also discuss how large quantum effects in $h\to\gamma\gamma$ may arise in a
SM-like scenario and a certain part of the parameter space can be ruled out
from the diphoton signal strength. Using $T$-parameter and diphoton signal
strength measurements, we update the bounds on the nonstandard scalar masses.
| [
{
"created": "Wed, 27 Apr 2016 15:00:21 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 2016 18:53:57 GMT",
"version": "v2"
}
] | 2016-12-22 | [
[
"Das",
"Dipankar",
""
],
[
"Santamaria",
"Arcadi",
""
]
] | We show that in the Higgs triplet model, after the Higgs discovery, the mixing angle in the CP-even sector can be strongly constrained from unitarity. We also discuss how large quantum effects in $h\to\gamma\gamma$ may arise in a SM-like scenario and a certain part of the parameter space can be ruled out from the diphoton signal strength. Using $T$-parameter and diphoton signal strength measurements, we update the bounds on the nonstandard scalar masses. |
hep-ph/9812524 | Hyun-Chul Kim | Mario Franz, Hyun-Chul Kim, and Klaus Goeke | Effective $\Delta S=1$ weak chiral Lagrangian from the instanton-induced
chiral quark model | Talk given at the 1998 YITP Workshop on QCD and Hadron Physics, 14-16
October, Kyoto, Japan. 5 pages with 1 figure | null | null | PNU-NTG-05/98 | hep-ph | null | We present the recent investigation of the $\Delta S = 1$ effective weak
chiral Lagrangian within the framework of the instanton-induced chiral quark
model. Starting from the effective four-quark operators, we derive the
effective weak chiral action by integrating out the constituent quark fields.
Employing the derivative expansion, we obtain the effective weak chiral
Lagrangian to ${\cal O} (p^4)$ order with low energy constants.
| [
{
"created": "Wed, 30 Dec 1998 12:50:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Franz",
"Mario",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Goeke",
"Klaus",
""
]
] | We present the recent investigation of the $\Delta S = 1$ effective weak chiral Lagrangian within the framework of the instanton-induced chiral quark model. Starting from the effective four-quark operators, we derive the effective weak chiral action by integrating out the constituent quark fields. Employing the derivative expansion, we obtain the effective weak chiral Lagrangian to ${\cal O} (p^4)$ order with low energy constants. |
2307.08926 | Zhi-Gang Wang | Qi Xin, Xiao-Song Yang, Zhi-Gang Wang | The singly-charmed pentaquark molecular states via the QCD sum rules | 23 pages, 6 figures | Int. J. Mod. Phys. A38 (2023) 2350123 | 10.1142/S0217751X23501233 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we systematically investigate the singly-charmed pentaquark
molecular states $D^{(*)}N$, $D^{(*)}\Xi^{(*)}$ and $D_s^{(*)}\Xi^{(*)}$ with
the QCD sum rules by carrying out the operator product expansion up to the
vacuum condensates of dimension 13 and taking fully account of the light-flavor
$SU(3)$ breaking effects. The numerical results favor assigning the
$\Omega_c(3185)$ as the $D\Xi$ molecular state with the $J^P=\frac{1}{2}^-$ and
$| I,I_3 \rangle=| 0,0 \rangle$, assigning the $\Omega_c(3327)$ as the $D^*\Xi$
molecular state with the $J^P=\frac{3}{2}^-$ and $|I,I_3 \rangle=| 0,0
\rangle$, assigning the $\Sigma_c(2800)$ as the $DN$ molecular state with the
$J^P=\frac{1}{2}^-$ and $| I,I_3 \rangle=| 1,0 \rangle$, and assigning the
$\Lambda_c(2940)/\Lambda_c(2910)$ as the $D^*N$ molecular state with the
$J^P=\frac{3}{2}^-$ and $| I,I_3 \rangle=| 0,0 \rangle$. Other potential
molecule candidates are also predicted, which may be observed in future
experiments. For example, we can search for the $D\Xi$ and $D^*\Xi$ molecular
states with the isospin $| I,I_3 \rangle=| 1,\pm1 \,\rangle$ in the
$\Xi_c^+\bar{K}^0$ and $\Xi_c^0\bar{K}^-$ mass spectrum respectively in the
future, which could shed light on the nature of the $\Omega_c(3185/3327)$.
| [
{
"created": "Tue, 18 Jul 2023 02:11:52 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Aug 2023 01:12:58 GMT",
"version": "v2"
}
] | 2023-09-12 | [
[
"Xin",
"Qi",
""
],
[
"Yang",
"Xiao-Song",
""
],
[
"Wang",
"Zhi-Gang",
""
]
] | In this work, we systematically investigate the singly-charmed pentaquark molecular states $D^{(*)}N$, $D^{(*)}\Xi^{(*)}$ and $D_s^{(*)}\Xi^{(*)}$ with the QCD sum rules by carrying out the operator product expansion up to the vacuum condensates of dimension 13 and taking fully account of the light-flavor $SU(3)$ breaking effects. The numerical results favor assigning the $\Omega_c(3185)$ as the $D\Xi$ molecular state with the $J^P=\frac{1}{2}^-$ and $| I,I_3 \rangle=| 0,0 \rangle$, assigning the $\Omega_c(3327)$ as the $D^*\Xi$ molecular state with the $J^P=\frac{3}{2}^-$ and $|I,I_3 \rangle=| 0,0 \rangle$, assigning the $\Sigma_c(2800)$ as the $DN$ molecular state with the $J^P=\frac{1}{2}^-$ and $| I,I_3 \rangle=| 1,0 \rangle$, and assigning the $\Lambda_c(2940)/\Lambda_c(2910)$ as the $D^*N$ molecular state with the $J^P=\frac{3}{2}^-$ and $| I,I_3 \rangle=| 0,0 \rangle$. Other potential molecule candidates are also predicted, which may be observed in future experiments. For example, we can search for the $D\Xi$ and $D^*\Xi$ molecular states with the isospin $| I,I_3 \rangle=| 1,\pm1 \,\rangle$ in the $\Xi_c^+\bar{K}^0$ and $\Xi_c^0\bar{K}^-$ mass spectrum respectively in the future, which could shed light on the nature of the $\Omega_c(3185/3327)$. |
1104.1838 | Zijia Zhao | Zhao Zi-Jia, Pan Dong-Mei | Estimating strong decays of X(3915) and X(4350) | 12 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Strong decays of X(3915) and X(4350) have been studied by assuming them as
P-wave charmonium states. We estimate the {\Gamma}(X(3915) \to
J/{\psi}{\omega}) and {\Gamma}(X(4350) \to J/{\psi}\phi) via D(*)D(*)open-charm
intermediate states. Our calculation supports that the assignment of X(4350) to
the charmonium state while the assignment of X(3915) is disfavored.
| [
{
"created": "Mon, 11 Apr 2011 04:16:25 GMT",
"version": "v1"
}
] | 2015-03-19 | [
[
"Zi-Jia",
"Zhao",
""
],
[
"Dong-Mei",
"Pan",
""
]
] | Strong decays of X(3915) and X(4350) have been studied by assuming them as P-wave charmonium states. We estimate the {\Gamma}(X(3915) \to J/{\psi}{\omega}) and {\Gamma}(X(4350) \to J/{\psi}\phi) via D(*)D(*)open-charm intermediate states. Our calculation supports that the assignment of X(4350) to the charmonium state while the assignment of X(3915) is disfavored. |
hep-ph/9207271 | Jiang Liu | Jiang Liu (University of Pennsylvania) | Final-State-Interaction Simulation of T-Violation in the Top-Quark
Semileptonic Decay | 14 pages, 1 diagram (not included) | Phys.Rev. D48 (1993) 212-216 | 10.1103/PhysRevD.48.212 | UPR-0517T | hep-ph | null | The standard electroweak final-state interaction induces a false T-odd
correlation in the top-quark semileptonic decay. The correlation parameter is
calculated in the standard model and found to be considerably larger than those
that could be produced by genuine T-violation effects in a large class of
theoretical models.
| [
{
"created": "Thu, 30 Jul 1992 14:01:48 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Liu",
"Jiang",
"",
"University of Pennsylvania"
]
] | The standard electroweak final-state interaction induces a false T-odd correlation in the top-quark semileptonic decay. The correlation parameter is calculated in the standard model and found to be considerably larger than those that could be produced by genuine T-violation effects in a large class of theoretical models. |
hep-ph/0311315 | Tatsuo Kobayashi | Tetsutaro Higaki, Yoshiharu Kawamura, Tatsuo Kobayashi and Hiroaki
Nakano | Non-perturbative Kahler Potential, Dilaton Stabilization and
Fayet-Iliopoulos Term | 10 pages, 2 figures | Phys.Lett. B582 (2004) 257-262 | 10.1016/j.physletb.2003.12.044 | null | hep-ph hep-th | null | We study the dilaton stabilization in models with anomalous U(1) symmetry by
adding specific string-motivated, non-perturbative corrections to the
tree-level dilaton K\"{a}hler potential. We find that the non-perturbative
effects can stabilize the dilaton at a desirably large value. We also observe
that the size of Fayet-Iliopoulos term is reduced at the stabilized point.
| [
{
"created": "Tue, 25 Nov 2003 06:07:23 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Higaki",
"Tetsutaro",
""
],
[
"Kawamura",
"Yoshiharu",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Nakano",
"Hiroaki",
""
]
] | We study the dilaton stabilization in models with anomalous U(1) symmetry by adding specific string-motivated, non-perturbative corrections to the tree-level dilaton K\"{a}hler potential. We find that the non-perturbative effects can stabilize the dilaton at a desirably large value. We also observe that the size of Fayet-Iliopoulos term is reduced at the stabilized point. |
hep-ph/9209268 | null | Adam F. Falk and Matthias Neubert | Second Order Power Corrections in the Heavy Quark Effective Theory I.
Formalism and Meson Form Factors | (34 pages, REVTEX, two postscript figures available upon request),
SLAC-PUB-5897 | Phys.Rev. D47 (1993) 2965-2981 | 10.1103/PhysRevD.47.2965 | null | hep-ph | null | In the heavy quark effective theory, hadronic matrix elements of currents
between two hadrons containing a heavy quark are expanded in inverse powers of
the heavy quark masses, with coefficients that are functions of the kinematic
variable $v\cdot v'$. For the ground state pseudoscalar and vector mesons, this
expansion is constructed at order $1/m_Q^2$. A minimal set of universal form
factors is defined in terms of matrix elements of higher dimension operators in
the effective theory. The zero recoil normalization conditions following from
vector current conservation are derived. Several phenomenological applications
of the general results are discussed in detail. It is argued that at zero
recoil the semileptonic decay rates for $B\to D\,\ell\,\nu$ and $B\to
D^*\ell\,\nu$ receive only small second order corrections, which are unlikely
to exceed the level of a few percent. This supports the usefulness of the heavy
quark expansion for a reliable determination of $V_{cb}$.
| [
{
"created": "Wed, 23 Sep 1992 17:13:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Falk",
"Adam F.",
""
],
[
"Neubert",
"Matthias",
""
]
] | In the heavy quark effective theory, hadronic matrix elements of currents between two hadrons containing a heavy quark are expanded in inverse powers of the heavy quark masses, with coefficients that are functions of the kinematic variable $v\cdot v'$. For the ground state pseudoscalar and vector mesons, this expansion is constructed at order $1/m_Q^2$. A minimal set of universal form factors is defined in terms of matrix elements of higher dimension operators in the effective theory. The zero recoil normalization conditions following from vector current conservation are derived. Several phenomenological applications of the general results are discussed in detail. It is argued that at zero recoil the semileptonic decay rates for $B\to D\,\ell\,\nu$ and $B\to D^*\ell\,\nu$ receive only small second order corrections, which are unlikely to exceed the level of a few percent. This supports the usefulness of the heavy quark expansion for a reliable determination of $V_{cb}$. |
hep-ph/0011091 | Joan Sola | Santi Bejar, Jaume Guasch, Joan Sola | Loop Induced Flavor Changing Neutral Decays of the Top Quark in a
General Two-Higgs-Doublet Model | 18 pages, LaTeX, 5 figures, 1 table. References added | Nucl.Phys.B600:21-38,2001 | 10.1016/S0550-3213(01)00044-X | UAB-FT-491, KA-TP-22-2000 | hep-ph | null | Decays of the top quark induced by flavor changing neutral currents (FCNC)
are known to be extremely rare events within the Standard Model. This is so not
only for the decay modes into gauge bosons, but most notably in the case of the
Higgs channels, e.g. t-> H_{SM}+c, with a branching fraction of 10^{-13} at
most. Therefore, detection of FCNC top quark decays in a future high-energy,
and high-luminosity, machine like the LHC or the LC would be an indisputable
signal of new physics. In this paper we show that within the simplest extension
of the SM, namely the general two-Higgs-doublet model, the FCNC top quark
decays into Higgs bosons, t->(h^{0},H^{0},A^{0})+c, can be the most favored
FCNC modes -- comparable or even more efficient than the gluon channel t-> g+c.
In both cases the optimal results are obtained for Type II models. However,
only the Higgs channels can have rates reaching the detectable level (10^{-5}),
with a maximum of order 10^{-4} which is compatible with the charged Higgs
bounds from radiative B-meson decays. We compare with the previous results
obtained in the Higgs sector of the MSSM.
| [
{
"created": "Tue, 7 Nov 2000 19:10:55 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2001 15:44:11 GMT",
"version": "v2"
}
] | 2010-03-26 | [
[
"Bejar",
"Santi",
""
],
[
"Guasch",
"Jaume",
""
],
[
"Sola",
"Joan",
""
]
] | Decays of the top quark induced by flavor changing neutral currents (FCNC) are known to be extremely rare events within the Standard Model. This is so not only for the decay modes into gauge bosons, but most notably in the case of the Higgs channels, e.g. t-> H_{SM}+c, with a branching fraction of 10^{-13} at most. Therefore, detection of FCNC top quark decays in a future high-energy, and high-luminosity, machine like the LHC or the LC would be an indisputable signal of new physics. In this paper we show that within the simplest extension of the SM, namely the general two-Higgs-doublet model, the FCNC top quark decays into Higgs bosons, t->(h^{0},H^{0},A^{0})+c, can be the most favored FCNC modes -- comparable or even more efficient than the gluon channel t-> g+c. In both cases the optimal results are obtained for Type II models. However, only the Higgs channels can have rates reaching the detectable level (10^{-5}), with a maximum of order 10^{-4} which is compatible with the charged Higgs bounds from radiative B-meson decays. We compare with the previous results obtained in the Higgs sector of the MSSM. |
1801.03944 | Carlo Oleari | Silvia Ferrario Ravasio, Tomas Jezo, Paolo Nason and Carlo Oleari | A theoretical study of top-mass measurements at the LHC using NLO+PS
generators of increasing accuracy | Version accepted for publication by EPJC. 55 pages, 17 figures, 25
tables | null | 10.1140/epjc/s10052-018-5909-7 | CERN-TH-2018-001 ZU-TH 01/18 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the theoretical uncertainties in the determination of
the top-quark mass using next-to-leading-order (NLO) generators interfaced to
parton showers (PS) that have different levels of accuracy. Specifically we
consider three generators: one that implements NLO corrections in the
production dynamics, one that includes also NLO corrections in top decay in the
narrow width approximation, and one that implements NLO corrections for both
production and decay including finite-width and interference effects. Since our
aim is to provide an assessment of the uncertainties of purely theoretical
origin, we consider simplified top-mass related observables that are broadly
related to those effectively used by experiments, eventually modelling
experimental resolution effects with simple smearing procedures. We estimate
the differences in the value of the extracted top mass that would occur due to
the use of the three different NLO generators, to the variation of scales, to
the choice of parton distribution functions and to the matching procedure.
Furthermore, we also consider differences due to the shower and to the
modelling of non-perturbative effects by interfacing our NLO generators to both
Pythia8.2 and Herwig7.1, with various settings. We find very different results
depending upon the adopted shower model. While with Pythia8.2 we find moderate
differences between the different NLO+PS generators, with Herwig7.1 we find
very large ones. Furthermore, the differences between Pythia8.2 and Herwig7.1
generators are also remarkably large.
| [
{
"created": "Thu, 11 Jan 2018 19:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2018 15:36:07 GMT",
"version": "v2"
}
] | 2018-07-04 | [
[
"Ravasio",
"Silvia Ferrario",
""
],
[
"Jezo",
"Tomas",
""
],
[
"Nason",
"Paolo",
""
],
[
"Oleari",
"Carlo",
""
]
] | In this paper we study the theoretical uncertainties in the determination of the top-quark mass using next-to-leading-order (NLO) generators interfaced to parton showers (PS) that have different levels of accuracy. Specifically we consider three generators: one that implements NLO corrections in the production dynamics, one that includes also NLO corrections in top decay in the narrow width approximation, and one that implements NLO corrections for both production and decay including finite-width and interference effects. Since our aim is to provide an assessment of the uncertainties of purely theoretical origin, we consider simplified top-mass related observables that are broadly related to those effectively used by experiments, eventually modelling experimental resolution effects with simple smearing procedures. We estimate the differences in the value of the extracted top mass that would occur due to the use of the three different NLO generators, to the variation of scales, to the choice of parton distribution functions and to the matching procedure. Furthermore, we also consider differences due to the shower and to the modelling of non-perturbative effects by interfacing our NLO generators to both Pythia8.2 and Herwig7.1, with various settings. We find very different results depending upon the adopted shower model. While with Pythia8.2 we find moderate differences between the different NLO+PS generators, with Herwig7.1 we find very large ones. Furthermore, the differences between Pythia8.2 and Herwig7.1 generators are also remarkably large. |
hep-ph/0010246 | Sonja Kabana | Sonja Kabana (University of Bern, Switzerland) | Hadronic centrality dependence in nuclear collisions | 4 pages, 4 figures, to appear in the proceedings of the XXXth
International Conference on High Energy Physics, 27 July - 2 August 2000,
Osaka, Japan | null | null | University of Bern preprint BUHE-00-08 | hep-ph | null | The kaon number density in nucleus+nucleus and p+p reactions is investigated
for the first time as a function of the initial energy density $\epsilon$ and
is found to exhibit a discontinuity around $\epsilon$=1.3 GeV/fm$^3$. This
suggests a higher degree of chemical equilibrium for $\epsilon >$
1.3 GeV/fm$^3$. It can also be interpreted as reflection of the same
discontinuity, appearing in the chemical freeze out temperature (T) as a
function of $\epsilon$. The $N^{\alpha \sim 1}$ dependence of (u,d,s) hadrons,
with N the number of participating nucleons, also indicates a high degree of
chemical equilibrium and T saturation, reached at $\epsilon >$1.3
GeV/fm$^3$.Assuming that the intermediate mass region (IMR) dimuon enhancement
seen by NA50 is due to open charm ($D \bar{D}$), the following observation can
be made: a) Charm is not equilibrated. b) $J/\Psi/D \bar{D}$ suppression
-unlike $J/\Psi/DY$- appears also in S+A collisions, above $\epsilon$ $\sim$1
GeV/fm$^3$. c) Both charm and strangeness show a discontinuity near the same
$\epsilon$. d) $J/\Psi$ could be formed mainly through $c \bar{c}$ coalescence.
e) The enhancement factors of hadrons with u,d,s,c quarks may be connected in a
simple way to the mass gain of these particles if they are produced out of a
quark gluon plasma (QGP). We discuss these results as possible evidence for the
QCD phase transition occuring near $\epsilon \sim $1.3 GeV/fm$^3$.
| [
{
"created": "Fri, 20 Oct 2000 22:07:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kabana",
"Sonja",
"",
"University of Bern, Switzerland"
]
] | The kaon number density in nucleus+nucleus and p+p reactions is investigated for the first time as a function of the initial energy density $\epsilon$ and is found to exhibit a discontinuity around $\epsilon$=1.3 GeV/fm$^3$. This suggests a higher degree of chemical equilibrium for $\epsilon >$ 1.3 GeV/fm$^3$. It can also be interpreted as reflection of the same discontinuity, appearing in the chemical freeze out temperature (T) as a function of $\epsilon$. The $N^{\alpha \sim 1}$ dependence of (u,d,s) hadrons, with N the number of participating nucleons, also indicates a high degree of chemical equilibrium and T saturation, reached at $\epsilon >$1.3 GeV/fm$^3$.Assuming that the intermediate mass region (IMR) dimuon enhancement seen by NA50 is due to open charm ($D \bar{D}$), the following observation can be made: a) Charm is not equilibrated. b) $J/\Psi/D \bar{D}$ suppression -unlike $J/\Psi/DY$- appears also in S+A collisions, above $\epsilon$ $\sim$1 GeV/fm$^3$. c) Both charm and strangeness show a discontinuity near the same $\epsilon$. d) $J/\Psi$ could be formed mainly through $c \bar{c}$ coalescence. e) The enhancement factors of hadrons with u,d,s,c quarks may be connected in a simple way to the mass gain of these particles if they are produced out of a quark gluon plasma (QGP). We discuss these results as possible evidence for the QCD phase transition occuring near $\epsilon \sim $1.3 GeV/fm$^3$. |
hep-ph/9910376 | Norisuke Sakai | N. Sakai (Tokyo Institute of Technology) | Supersymmetry in Field Theory | 39 pages, latex, no figures, To be published by The Indian National
Science Academy. Two references added | null | null | null | hep-ph | null | Supersymmetric theories are reviewed in the context of field theories. The
gauge hierarchy problem in attempting the unification of all fundamental
interactions is the strongest motivation of modern development of
supersymmetry. Starting from the general notion of supersymmetry as a symmetry
between bosons and fermions, we explain how the supersymmetry becomes a part of
the space-time symmetry if we wish to maintain the relativisitic invariance.
The precise idea of supersymmetry is then introduced and the supersymmetric
field theories are formulated. There has been a significant breakthrough in the
study of nonperturbative effects in supersymmetric field theories using the
holomorphy and symmetry arguments. Some of these ideas and results are briefly
reviewed.
| [
{
"created": "Mon, 18 Oct 1999 10:20:46 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Dec 1999 03:59:30 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Sakai",
"N.",
"",
"Tokyo Institute of Technology"
]
] | Supersymmetric theories are reviewed in the context of field theories. The gauge hierarchy problem in attempting the unification of all fundamental interactions is the strongest motivation of modern development of supersymmetry. Starting from the general notion of supersymmetry as a symmetry between bosons and fermions, we explain how the supersymmetry becomes a part of the space-time symmetry if we wish to maintain the relativisitic invariance. The precise idea of supersymmetry is then introduced and the supersymmetric field theories are formulated. There has been a significant breakthrough in the study of nonperturbative effects in supersymmetric field theories using the holomorphy and symmetry arguments. Some of these ideas and results are briefly reviewed. |
0909.1609 | Ben Pecjak | C. Greub, M. Neubert, and B.D. Pecjak | NNLO corrections to B --> X_u l nu and the determination of |V_ub| | 24 pages, 7 figures | Eur.Phys.J.C65:501-515,2010 | 10.1140/epjc/s10052-009-1210-0 | MZ-TH/09-32 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of next-to-next-to-leading order (NNLO) QCD corrections
on partial decay rates in B --> X_u l nu decays, at leading-order in the 1/m_b
expansion for shape-function kinematics. These corrections are implemented
within a modified form of the BLNP framework, which allows for arbitrary
variations of the jet scale mu_i \sim 1.5 GeV. Our analysis includes a detailed
comparison between resummed and fixed-order perturbation theory, and between
the complete NNLO results and those obtained in the large-$\beta_0$
approximation. For the default choice mu_i=1.5 GeV used in current extractions
of |V_ub| within the BLNP framework, the NNLO corrections induce significant
downward shifts in the central values of partial decay rates with cuts on the
hadronic variable P_+, the hadronic invariant mass, and the lepton energy. At
the same time, perturbative uncertainties are reduced, especially those at the
jet scale, which are the dominant ones at next-to-leading order (NLO). For
higher values of mu_i and in fixed-order perturbation theory, the shifts
between NLO and NNLO are more moderate. We combine our new results with known
power-suppressed terms in order to illustrate the implications of our analysis
on the determination of |V_ub| from inclusive decays.
| [
{
"created": "Wed, 9 Sep 2009 12:31:57 GMT",
"version": "v1"
}
] | 2010-02-11 | [
[
"Greub",
"C.",
""
],
[
"Neubert",
"M.",
""
],
[
"Pecjak",
"B. D.",
""
]
] | We study the impact of next-to-next-to-leading order (NNLO) QCD corrections on partial decay rates in B --> X_u l nu decays, at leading-order in the 1/m_b expansion for shape-function kinematics. These corrections are implemented within a modified form of the BLNP framework, which allows for arbitrary variations of the jet scale mu_i \sim 1.5 GeV. Our analysis includes a detailed comparison between resummed and fixed-order perturbation theory, and between the complete NNLO results and those obtained in the large-$\beta_0$ approximation. For the default choice mu_i=1.5 GeV used in current extractions of |V_ub| within the BLNP framework, the NNLO corrections induce significant downward shifts in the central values of partial decay rates with cuts on the hadronic variable P_+, the hadronic invariant mass, and the lepton energy. At the same time, perturbative uncertainties are reduced, especially those at the jet scale, which are the dominant ones at next-to-leading order (NLO). For higher values of mu_i and in fixed-order perturbation theory, the shifts between NLO and NNLO are more moderate. We combine our new results with known power-suppressed terms in order to illustrate the implications of our analysis on the determination of |V_ub| from inclusive decays. |
2206.12120 | Vadim Guzey | V. Guzey (St. Petersburg, INP), E. Kryshen (St. Petersburg, INP), M.
Strikman (Penn State U.), M. Zhalov (St. Petersburg, INP) | Photoproduction of $J/\psi$ in d+Au ultraperipheral collisions at the
BNL Relativistic Heavy Ion Collider | 5 pages, 2 figures. Final published version | null | 10.1103/PhysRevC.106.064909 | null | hep-ph hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | We argue that the STAR data on $J/\psi$ photoproduction in $d+Au$
ultraperipheral collisions (UPCs) at the momentum transfer $t \neq 0$ primarily
probes elastic and possibly nucleon-dissociative $J/\psi$ photoproduction on
quasi-free nucleons, while being essentially insensitive to expectedly weak
nuclear modifications of the gluon distribution in the deuteron. Analyzing the
STAR detector capabilities for selection of UPC events, we explore the
possibility that the contribution of nucleon-dissociative $J/\psi$
photoproduction is negligibly small and obtain a very good description of the
$t$ dependence of the STAR total cross section.
| [
{
"created": "Fri, 24 Jun 2022 07:27:01 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jul 2022 11:00:22 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Dec 2022 07:59:35 GMT",
"version": "v3"
}
] | 2023-01-04 | [
[
"Guzey",
"V.",
"",
"St. Petersburg, INP"
],
[
"Kryshen",
"E.",
"",
"St. Petersburg, INP"
],
[
"Strikman",
"M.",
"",
"Penn State U."
],
[
"Zhalov",
"M.",
"",
"St. Petersburg, INP"
]
] | We argue that the STAR data on $J/\psi$ photoproduction in $d+Au$ ultraperipheral collisions (UPCs) at the momentum transfer $t \neq 0$ primarily probes elastic and possibly nucleon-dissociative $J/\psi$ photoproduction on quasi-free nucleons, while being essentially insensitive to expectedly weak nuclear modifications of the gluon distribution in the deuteron. Analyzing the STAR detector capabilities for selection of UPC events, we explore the possibility that the contribution of nucleon-dissociative $J/\psi$ photoproduction is negligibly small and obtain a very good description of the $t$ dependence of the STAR total cross section. |
hep-ph/9608439 | Charles A. Nelson | Charles A. Nelson | Tests at a Tau/Charm Factory with Longitudinally Polarized Beams | 14 pages, latex, no figures, no external macros. Typos in Eqs.(2,4,5)
corrected | null | null | SUNY BING 6/14/96 | hep-ph | null | In a recent paper, eight semileptonic parameters were defined to specify the
most general Lorentz-invariant spin correlation functions for tau semileptonic
decays. The parameters were physically defined in terms of tau-decay
partial-width intensities for polarized final states. This paper studies how
these parameters can be simply measured at a tau/charm factory with
longitudinally polarized beams without using spin-correlation techniques.
Thereby the parameters can also be used to bound the effective-mass scales $
\Lambda $ for ``new physics" such as arising from lepton compositeness,
leptonic CP violation, leptonic T violation, tau weak magnetism, weak
electricity, and/or second-class currents.
| [
{
"created": "Mon, 26 Aug 1996 08:51:50 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Aug 1996 15:50:44 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Nelson",
"Charles A.",
""
]
] | In a recent paper, eight semileptonic parameters were defined to specify the most general Lorentz-invariant spin correlation functions for tau semileptonic decays. The parameters were physically defined in terms of tau-decay partial-width intensities for polarized final states. This paper studies how these parameters can be simply measured at a tau/charm factory with longitudinally polarized beams without using spin-correlation techniques. Thereby the parameters can also be used to bound the effective-mass scales $ \Lambda $ for ``new physics" such as arising from lepton compositeness, leptonic CP violation, leptonic T violation, tau weak magnetism, weak electricity, and/or second-class currents. |
0907.3074 | Mikhail Shifman | M. Shifman | LARGE EXTRA DIMENSIONS: Becoming acquainted with an alternative paradigm | 33 pages, 17 figures; v2. a few references added | Int.J.Mod.Phys.A25:199-225,2010 | 10.1142/S0217751X10048548 | FTPI-MINN-09/26, UMN-TH-2806/09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a colloquium style pedagogical introduction to the paradigm of large
extra dimensions. To be published in the Proceedings of the Workshop "Crossing
the boundaries: Gauge dynamics at strong coupling," (May 14 - 17, 2009,
Minneapolis), Eds. M. Peloso and A. Vainshtein, (World Scientific, Singapore,
2009), p. 3.
| [
{
"created": "Fri, 17 Jul 2009 11:54:55 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Nov 2009 22:17:56 GMT",
"version": "v2"
}
] | 2010-02-16 | [
[
"Shifman",
"M.",
""
]
] | This is a colloquium style pedagogical introduction to the paradigm of large extra dimensions. To be published in the Proceedings of the Workshop "Crossing the boundaries: Gauge dynamics at strong coupling," (May 14 - 17, 2009, Minneapolis), Eds. M. Peloso and A. Vainshtein, (World Scientific, Singapore, 2009), p. 3. |
1203.5416 | Bogdan Malaescu | Bogdan Malaescu and Pavel Starovoitov | Evaluation of the Strong Coupling Constant alpha_s Using the ATLAS
Inclusive Jet Cross-Section Data | 15 pages, 6 figures. Extended discussion of non-perturbative
corrections. Matches version published in EPJ C | EPJ C Volume 72, Number 6 (2012), 2041 | 10.1140/epjc/s10052-012-2041-y | CERN-PH-EP-2012-064; DESY-12-039 | hep-ph hep-ex physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a determination of the strong coupling constant using the latest
ATLAS inclusive jet cross section data, from proton-proton collisions at
sqrt{s}=7 TeV, and their full information on the bin-to-bin correlations.
Several procedures for combining the statistical information from the different
data inputs are studied and compared. The theoretical prediction is obtained
using NLO QCD, and it also includes non-perturbative corrections. Our
determination uses inputs with transverse momenta between 45 and 600 GeV, the
running of the strong coupling being also tested in this range. Good agreement
is observed when comparing our result with the world average at the Z-boson
scale, as well as with the most recent results from the Tevatron.
| [
{
"created": "Sat, 24 Mar 2012 14:17:59 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2012 10:18:34 GMT",
"version": "v2"
}
] | 2012-07-04 | [
[
"Malaescu",
"Bogdan",
""
],
[
"Starovoitov",
"Pavel",
""
]
] | We perform a determination of the strong coupling constant using the latest ATLAS inclusive jet cross section data, from proton-proton collisions at sqrt{s}=7 TeV, and their full information on the bin-to-bin correlations. Several procedures for combining the statistical information from the different data inputs are studied and compared. The theoretical prediction is obtained using NLO QCD, and it also includes non-perturbative corrections. Our determination uses inputs with transverse momenta between 45 and 600 GeV, the running of the strong coupling being also tested in this range. Good agreement is observed when comparing our result with the world average at the Z-boson scale, as well as with the most recent results from the Tevatron. |
2104.09205 | Arnab Dasgupta | Arnab Dasgupta, Sin Kyu Kang and Myeonghun Park | Neutrino mass and $(g-2)_{\mu}$ with dark $U(1)_D$ symmetry | 15 pages, 3 figues | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We propose an extension of the Standard Model (SM) for radiative neutrino
mass by introducing a dark $U(1)_D$ gauge symmetry. The kinetic mixing between
the SM gauges and the dark $U(1)_D$ gauge arises at 1-loop mediated by new
inert scalar fields. We show that the tiny neutrino mass and dark matter
candidates are naturally accommodated. Motivated by the recent measurement of
$(g-2)_{\mu}$ indicating $4.2~ \sigma$ deviation from the SM prediction, we
examine how the deviation $\Delta a_{\mu}$ can be explained in this model.
| [
{
"created": "Mon, 19 Apr 2021 11:04:26 GMT",
"version": "v1"
}
] | 2021-04-20 | [
[
"Dasgupta",
"Arnab",
""
],
[
"Kang",
"Sin Kyu",
""
],
[
"Park",
"Myeonghun",
""
]
] | We propose an extension of the Standard Model (SM) for radiative neutrino mass by introducing a dark $U(1)_D$ gauge symmetry. The kinetic mixing between the SM gauges and the dark $U(1)_D$ gauge arises at 1-loop mediated by new inert scalar fields. We show that the tiny neutrino mass and dark matter candidates are naturally accommodated. Motivated by the recent measurement of $(g-2)_{\mu}$ indicating $4.2~ \sigma$ deviation from the SM prediction, we examine how the deviation $\Delta a_{\mu}$ can be explained in this model. |
hep-ph/0307158 | Alessio Sarti | Alessio Sarti (for the BaBar Collaboration) | Inclusive Vub measurements at BaBar | Invited talk at the Workshop on the CKM Unitarity Triangle, IPPP
Durham, April 2003 (eConf C0304052). 4 pages LaTeX, 3 eps figures | ECONF C0304052:WG115,2003 | null | null | hep-ph | null | We present two inclusive measurements of Cabibbo-Kobayashi-Maskawa (CKM)
matrix element Vub: one uses the lepton energy spectrum (E_l) and the other
uses the invariant mass of the hadronic system (m_X) to discriminate signal (B
-> X_u lnu) and background (B -> X_c lnu) events in B -> Xlnu transitions. Both
analyses are based on data samples collected by the BaBar detector at the
PEP-II asymmetric-energy B Factory at SLAC.
| [
{
"created": "Fri, 11 Jul 2003 09:28:34 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Sarti",
"Alessio",
"",
"for the BaBar Collaboration"
]
] | We present two inclusive measurements of Cabibbo-Kobayashi-Maskawa (CKM) matrix element Vub: one uses the lepton energy spectrum (E_l) and the other uses the invariant mass of the hadronic system (m_X) to discriminate signal (B -> X_u lnu) and background (B -> X_c lnu) events in B -> Xlnu transitions. Both analyses are based on data samples collected by the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. |
2205.06431 | Martin White Dr | Martin John White | Recent dark matter results from the GAMBIT collaboration | Contribution to the 2022 QCD session of the 56th Rencontres de
Moriond | null | null | gambit-proceedings-2022 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this proceeding, I present the results of a recent global fit of an
effective field theory of dark matter, performed using the Global and Modular
Beyond-the-Standard Model Inference Tool (GAMBIT). A Dirac fermion dark matter
candidate is assumed to interact only with Standard Model quarks and gluons,
through a general set of operators up to mass dimension 7. The results provide
a reasonably up-to-date summary of our knowledge of possible WIMP interactions.
| [
{
"created": "Fri, 13 May 2022 02:54:09 GMT",
"version": "v1"
}
] | 2022-05-16 | [
[
"White",
"Martin John",
""
]
] | In this proceeding, I present the results of a recent global fit of an effective field theory of dark matter, performed using the Global and Modular Beyond-the-Standard Model Inference Tool (GAMBIT). A Dirac fermion dark matter candidate is assumed to interact only with Standard Model quarks and gluons, through a general set of operators up to mass dimension 7. The results provide a reasonably up-to-date summary of our knowledge of possible WIMP interactions. |
hep-ph/9407280 | Sergei Voloshin | Sergei Voloshin | Fluctuations in the Mixed Event Technique | 6 pages, LATEX | null | null | null | hep-ph | null | A method for an evaluation of fluctuations in the mixed event technique is
proposed. It is shown, that, generally, the magnitude of the fluctuations is
proportional to $N^{3/4}$, where $N$ is the number of produced events, which
should be compared with $N^{1/2}$ for the case of independent events. The
formula eligible for the use in an analysis of experimental data is provided.
| [
{
"created": "Tue, 12 Jul 1994 14:17:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Voloshin",
"Sergei",
""
]
] | A method for an evaluation of fluctuations in the mixed event technique is proposed. It is shown, that, generally, the magnitude of the fluctuations is proportional to $N^{3/4}$, where $N$ is the number of produced events, which should be compared with $N^{1/2}$ for the case of independent events. The formula eligible for the use in an analysis of experimental data is provided. |
1612.01455 | Farrukh A. Chishtie | F. A. Chishtie, D.G.C. McKeon | Renormalization Scheme Dependence and the Renormalization Group Beta
Function | 16 pages, 1 figure, minor typos fixed and additional comments made;
accepted at Physical Review D | Phys. Rev. D 95, 116013 (2017) | 10.1103/PhysRevD.95.116013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The renormalization that relates a coupling "a" associated with a distinct
renormalization group beta function in a given theory is considered.
Dimensional regularization and mass independent renormalization schemes are
used in this discussion. It is shown how the renormalization $a^*=a+x_2a^2$ is
related to a change in the mass scale $\mu$ that is induced by renormalization.
It is argued that the infrared fixed point is to be a determined in a
renormalization scheme in which the series expansion for a physical quantity
$R$ terminates.
| [
{
"created": "Mon, 5 Dec 2016 17:52:46 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2017 16:28:32 GMT",
"version": "v2"
},
{
"created": "Sat, 4 Feb 2017 19:40:39 GMT",
"version": "v3"
},
{
"created": "Mon, 3 Apr 2017 08:27:56 GMT",
"version": "v4"
},
{
"created": "Fri, 2 Jun 2017 14:56:16 GMT",
"version": "v5"
}
] | 2017-07-05 | [
[
"Chishtie",
"F. A.",
""
],
[
"McKeon",
"D. G. C.",
""
]
] | The renormalization that relates a coupling "a" associated with a distinct renormalization group beta function in a given theory is considered. Dimensional regularization and mass independent renormalization schemes are used in this discussion. It is shown how the renormalization $a^*=a+x_2a^2$ is related to a change in the mass scale $\mu$ that is induced by renormalization. It is argued that the infrared fixed point is to be a determined in a renormalization scheme in which the series expansion for a physical quantity $R$ terminates. |
hep-ph/9912460 | Tomas Blazek | Tomas Blazek | Muon g-2 in the MSSM constrained by simple SO(10) SUSY GUT | LATEX, 8 pages of text plus 6 figures (require epsf.sty) | null | null | NUHEP-99-81 | hep-ph | null | We show that the best fits of the MSSM constrained by a simple SO(10) SUSY
GUT are consistent with the present data on the muon anomalous magnetic moment.
The best fits assume rather large values of tan$\beta\approx 50$, and in our
analysis they are not {\em a priori} correlated in any way, directly or
indirectly, with the experimental limit on $a_\mu$. Regions in the SUSY
parameter space, which are currently ruled out because of too large
$a_\mu^{SUSY}$, are already excluded in the global fit by excessive corrections
to $m_b$, unacceptable $BR(b\to s\gamma)$, or direct experimental limits on
sparticle masses. However, our results indicate that the accuracy expected in
the ongoing E821 experiment at BNL will eventually turn the muon anomalous
magnetic moment into a major constraint for this regime of the MSSM.
| [
{
"created": "Wed, 22 Dec 1999 04:00:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blazek",
"Tomas",
""
]
] | We show that the best fits of the MSSM constrained by a simple SO(10) SUSY GUT are consistent with the present data on the muon anomalous magnetic moment. The best fits assume rather large values of tan$\beta\approx 50$, and in our analysis they are not {\em a priori} correlated in any way, directly or indirectly, with the experimental limit on $a_\mu$. Regions in the SUSY parameter space, which are currently ruled out because of too large $a_\mu^{SUSY}$, are already excluded in the global fit by excessive corrections to $m_b$, unacceptable $BR(b\to s\gamma)$, or direct experimental limits on sparticle masses. However, our results indicate that the accuracy expected in the ongoing E821 experiment at BNL will eventually turn the muon anomalous magnetic moment into a major constraint for this regime of the MSSM. |
hep-ph/0604061 | Alexey Drutskoy | A. Drutskoy | Determining Delta_Gamma_s / Gamma_s from Bf(B_s \to D_s^{(*)+}
D_s{(*)-}) measurements at e^+ e^- colliders running on the Y(5S) resonance | 8 pages | null | null | null | hep-ph | null | The feasibility of determining $\Delta \Gamma_s / Gamma_s$ from $B_s \to
D_s^{(*)+} D_s^{(*)-}$ decay branching fraction measurements at $e^+ e^-$
colliders running on the $\Upsilon$(5S) resonance is discussed. The expected
accuracies of the $B_s \to D_s^{(*)+} D_s^{(*)-}$ branching fraction
measurements and the $\Delta \Gamma_s / \Gamma_s$ determination with
50fb$^{-1}$ of data at the $\Upsilon$(5S) are estimated using Monte Carlo
simulation. Comparison of that measurement with a directly measured $\Delta
\Gamma_s / \Gamma_s$ value within and beyond Standard Model is discussed. A new
method of estimating $\Delta \Gamma_s / \Gamma_s$ is proposed, based on
comparing the CP-even and CP-odd components in $B^0 \to J/\Psi K^{*0}$ and $B_s
\to J/\Psi \phi$ decays. A comparison of $B_s$ and $B^0$ lifetime measurements
with theoretical predictions is discussed.
| [
{
"created": "Thu, 6 Apr 2006 18:13:27 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2006 15:35:11 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Apr 2006 16:37:42 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Drutskoy",
"A.",
""
]
] | The feasibility of determining $\Delta \Gamma_s / Gamma_s$ from $B_s \to D_s^{(*)+} D_s^{(*)-}$ decay branching fraction measurements at $e^+ e^-$ colliders running on the $\Upsilon$(5S) resonance is discussed. The expected accuracies of the $B_s \to D_s^{(*)+} D_s^{(*)-}$ branching fraction measurements and the $\Delta \Gamma_s / \Gamma_s$ determination with 50fb$^{-1}$ of data at the $\Upsilon$(5S) are estimated using Monte Carlo simulation. Comparison of that measurement with a directly measured $\Delta \Gamma_s / \Gamma_s$ value within and beyond Standard Model is discussed. A new method of estimating $\Delta \Gamma_s / \Gamma_s$ is proposed, based on comparing the CP-even and CP-odd components in $B^0 \to J/\Psi K^{*0}$ and $B_s \to J/\Psi \phi$ decays. A comparison of $B_s$ and $B^0$ lifetime measurements with theoretical predictions is discussed. |
1112.0300 | Francisco A. Brito | C. A. G. Almeida, M. A. Anacleto, F. A. Brito, E. Passos | Inflationary Cosmology and Superluminal Neutrinos | Latex, 4 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in the presence of a distance dependent Lorentz-violating
time-like background one may find superluminal neutrinos at some high energy
such as OPERA's scale. The similar behavior but approaching the subluminal
branch is found to appear for inflaton field in the low energy scale. Thus this
scenario seems to be suitable to acomplish both superluminal neutrinos and dark
energy.
| [
{
"created": "Thu, 1 Dec 2011 20:39:45 GMT",
"version": "v1"
}
] | 2011-12-02 | [
[
"Almeida",
"C. A. G.",
""
],
[
"Anacleto",
"M. A.",
""
],
[
"Brito",
"F. A.",
""
],
[
"Passos",
"E.",
""
]
] | We show that in the presence of a distance dependent Lorentz-violating time-like background one may find superluminal neutrinos at some high energy such as OPERA's scale. The similar behavior but approaching the subluminal branch is found to appear for inflaton field in the low energy scale. Thus this scenario seems to be suitable to acomplish both superluminal neutrinos and dark energy. |
0811.0617 | Tadafumi Ohsaku | Tadafumi Ohsaku | Generalized Seesaw Mechanism of Neutrino and Bose-Einstein Condensation
in the Modified O'Raifeartaigh Model | 15 pages, submitted for publication | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The modified O'Raifeartaigh model from the context of the generalized seesaw
mechanism of neutrino mass is investigated. In our evaluation of effective
potentials of the theory, both the component field and the superspace
formalisms to approach the problem are presented. In the component field
formalism, we take into account the Bose-Einstein condensates in the scalar
sector by the method of many-boson theory, i.e. we consider both the
condensates and the Hartree-Fock-Bogoliubov-type self-energies of quantum
fluctuations. The diagonalization of the mass matrix of the fermion sector
gives the same functional forms of the mass eigenvalues in the generalized
seesaw mechanism. The stability condition in the vicinity of the classical
vacuum which shows the generalized seesaw situation is obtained by the
examination of the mass eigenvalues of the scalar sector of the model. The
superspace formalism will be devoted to a comparison between its result with
that of the component field formalism.
| [
{
"created": "Tue, 4 Nov 2008 21:09:02 GMT",
"version": "v1"
}
] | 2008-12-08 | [
[
"Ohsaku",
"Tadafumi",
""
]
] | The modified O'Raifeartaigh model from the context of the generalized seesaw mechanism of neutrino mass is investigated. In our evaluation of effective potentials of the theory, both the component field and the superspace formalisms to approach the problem are presented. In the component field formalism, we take into account the Bose-Einstein condensates in the scalar sector by the method of many-boson theory, i.e. we consider both the condensates and the Hartree-Fock-Bogoliubov-type self-energies of quantum fluctuations. The diagonalization of the mass matrix of the fermion sector gives the same functional forms of the mass eigenvalues in the generalized seesaw mechanism. The stability condition in the vicinity of the classical vacuum which shows the generalized seesaw situation is obtained by the examination of the mass eigenvalues of the scalar sector of the model. The superspace formalism will be devoted to a comparison between its result with that of the component field formalism. |
1109.3121 | Francois Arleo | Francois Arleo | Quenching of hadron and photon spectra in heavy-ion collisions from RHIC
to LHC | 9 pages, 2 figures. Proceedings of Quark Matter 2011, May 23-28 2011,
Annecy, France | null | 10.1088/0954-3899/38/12/124017 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generic features of parton energy loss effects on the quenching of single
hadron spectra in heavy-ion collisions are discussed, paying attention to the
expected differences from RHIC to LHC. The need for precise baseline
measurements in p-Pb collisions at the LHC is also emphasized. Finally I
briefly mention the production of prompt photons in heavy-ion collisions as
well as some open questions.
| [
{
"created": "Wed, 14 Sep 2011 16:09:17 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Arleo",
"Francois",
""
]
] | The generic features of parton energy loss effects on the quenching of single hadron spectra in heavy-ion collisions are discussed, paying attention to the expected differences from RHIC to LHC. The need for precise baseline measurements in p-Pb collisions at the LHC is also emphasized. Finally I briefly mention the production of prompt photons in heavy-ion collisions as well as some open questions. |
hep-ph/9303218 | Jeffrey Grandy | Jeffrey M. Grandy and Michael P. Mattis | Valley Bifurcation in an $O(3)$ $\sigma$ Model: Implications for
High-Energy Baryon Number Violation | (14 pages, Los Alamos Preprint LA-UR-93-811). 3 uuencoded figures
included | Phys.Lett. B307 (1993) 140-146 | 10.1016/0370-2693(93)90203-T | null | hep-ph | null | The valley method for computing the total high-energy anomalous cross section
$S_{anom}$ is the extension of the optical theorem to the case of
instanton-antiinstanton backgrounds. As a toy model for baryon number violation
in Electroweak theory, we consider a version of the $O(3)$ $\sigma$ model in
which the conformal invariance is broken perturbatively. We show that at a
critical energy the saddle-point values of the instanton size and
instanton-antiinstanton separation bifurcate into complex conjugate pairs. This
nonanalytic behavior signals the breakdown of the valley method at an energy
where $S_{anom}$ is still exponentially suppressed.
(Figures replaced 5/3/93).
| [
{
"created": "Thu, 4 Mar 1993 00:53:41 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 1993 19:29:49 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Grandy",
"Jeffrey M.",
""
],
[
"Mattis",
"Michael P.",
""
]
] | The valley method for computing the total high-energy anomalous cross section $S_{anom}$ is the extension of the optical theorem to the case of instanton-antiinstanton backgrounds. As a toy model for baryon number violation in Electroweak theory, we consider a version of the $O(3)$ $\sigma$ model in which the conformal invariance is broken perturbatively. We show that at a critical energy the saddle-point values of the instanton size and instanton-antiinstanton separation bifurcate into complex conjugate pairs. This nonanalytic behavior signals the breakdown of the valley method at an energy where $S_{anom}$ is still exponentially suppressed. (Figures replaced 5/3/93). |
hep-ph/0411223 | Ulf-G. Mei{\ss}ner | Peter C. Bruns, Ulf-G. Mei{\ss}ner | Infrared regularization for spin-1 fields | 22 pp, 5 figs | Eur.Phys.J. C40 (2005) 97-119 | 10.1140/epjc/s2005-02118-0 | HISKP-TH-04/23 | hep-ph hep-lat nucl-th | null | We extend the method of infrared regularization to spin-1 fields. As
applications, we discuss the chiral extrapolation of the rho meson mass from
lattice QCD data and the pion-rho sigma term.
| [
{
"created": "Wed, 17 Nov 2004 07:22:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bruns",
"Peter C.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We extend the method of infrared regularization to spin-1 fields. As applications, we discuss the chiral extrapolation of the rho meson mass from lattice QCD data and the pion-rho sigma term. |
2309.17353 | Giuseppe Bevilacqua | Giuseppe Bevilacqua | Modelling uncertainties and prompt b-jet identification in
$t\bar{t}b\bar{b}$ production with dilepton signatures at the LHC | 10 pages, 1 table, 5 figures. To appear in the Proceedings of the
16th International Symposium on Radiative Corrections: Applications of
Quantum Field Theory to Phenomenology (RADCOR2023), 28th May - 2nd June 2023 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | As one of the primary backgrounds to $pp \to t\bar{t}H(H\to b\bar{b})$, the
QCD process of $t\bar{t}b\bar{b}$ hadroproduction demands very accurate
theoretical predictions and estimates of uncertainties. On top of that, the
capacity of properly identifying prompt $b$-jets is beneficial for many
analyses. In this contribution we discuss state-of-the-art predictions for
$t\bar{t}b\bar{b}$ production with dilepton decays at the LHC, as obtained from
full off-shell NLO QCD calculations. We evaluate the dominant uncertainties of
the calculation and the impact of the off-shell effects on fiducial cross
sections. Furthermore, we explore a kinematic prescription for the
categorisation of prompt $b$-jets.
| [
{
"created": "Fri, 29 Sep 2023 15:59:08 GMT",
"version": "v1"
}
] | 2023-10-02 | [
[
"Bevilacqua",
"Giuseppe",
""
]
] | As one of the primary backgrounds to $pp \to t\bar{t}H(H\to b\bar{b})$, the QCD process of $t\bar{t}b\bar{b}$ hadroproduction demands very accurate theoretical predictions and estimates of uncertainties. On top of that, the capacity of properly identifying prompt $b$-jets is beneficial for many analyses. In this contribution we discuss state-of-the-art predictions for $t\bar{t}b\bar{b}$ production with dilepton decays at the LHC, as obtained from full off-shell NLO QCD calculations. We evaluate the dominant uncertainties of the calculation and the impact of the off-shell effects on fiducial cross sections. Furthermore, we explore a kinematic prescription for the categorisation of prompt $b$-jets. |
0805.1719 | Tomoi Koide | G.S.Denicol, T. Kodama, T. Koide, and Ph. Mota | Shock propagation and stability in causal dissipative hydrodynamics | 14 pages, 16 figures | Phys.Rev.C78:034901,2008 | 10.1103/PhysRevC.78.034901 | null | hep-ph cond-mat.stat-mech nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied the shock propagation and its stability with the causal
dissipative hydrodynamics in 1+1 dimensional systems. We show that the presence
of the usual viscosity is not enough to stabilize the solution. This problem is
solved by introducing an additional viscosity which is related to the
coarse-graining scale of the theory.
| [
{
"created": "Mon, 12 May 2008 19:50:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Denicol",
"G. S.",
""
],
[
"Kodama",
"T.",
""
],
[
"Koide",
"T.",
""
],
[
"Mota",
"Ph.",
""
]
] | We studied the shock propagation and its stability with the causal dissipative hydrodynamics in 1+1 dimensional systems. We show that the presence of the usual viscosity is not enough to stabilize the solution. This problem is solved by introducing an additional viscosity which is related to the coarse-graining scale of the theory. |
hep-ph/9712321 | Ren-Jie Zhang | Kingman Cheung and Ren-Jie Zhang (UCDavis) | V-A Constraint on a Product of R-parity Violating Couplings | 8 pages, REVTEX, no figures | Phys.Lett. B427 (1998) 73-76 | 10.1016/S0370-2693(98)00322-0 | UCD-97-26 | hep-ph | null | We study in the framework of R-parity violating supersymmetric theories the
effect of R-parity violation due to the operator L_i L_j \bar{E_k} on the (V-A)
structure of the muon decay. The precisely measured muon decay parameters can
constrain a product of R-parity violating couplings:
|\lambda_{232}\lambda_{131}| < 0.022 at the 90% CL, which is complementary to
the previous limits obtained by the e-\mu universality in \tau decay.
| [
{
"created": "Tue, 9 Dec 1997 22:37:41 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Cheung",
"Kingman",
"",
"UCDavis"
],
[
"Zhang",
"Ren-Jie",
"",
"UCDavis"
]
] | We study in the framework of R-parity violating supersymmetric theories the effect of R-parity violation due to the operator L_i L_j \bar{E_k} on the (V-A) structure of the muon decay. The precisely measured muon decay parameters can constrain a product of R-parity violating couplings: |\lambda_{232}\lambda_{131}| < 0.022 at the 90% CL, which is complementary to the previous limits obtained by the e-\mu universality in \tau decay. |
1509.06520 | G.R. Boroun | G.R.Boroun, S.Zarrin and F. Teimoury | Decoupling of the DGLAP evolution equations by Laplace method | 10 pages, 3 figures | Eur. Phys. J. Plus (2015) 130: 214 | 10.1140/epjp/i2015-15214-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we derive two second- order of differential equation for the
gluon and singlet distribution functions by using the Laplace transform method.
We decoupled the solutions of the singlet and gluon distributions into the
initial conditions (function and derivative of the function) at the virtuality
$Q_{0}^{2}$ separately as these solutions are defined by: \begin{eqnarray}
F_{2}^{s}(x,Q^{2}) &=& \mathcal{F}(F_{s0}, \partial F_{s0})\nonumber
&&\mathrm{and} \nonumber
G(x,Q^{2}) &=& \mathcal{G}(G_{0}, \partial G_{0}).\nonumber \end{eqnarray} We
compared our results with the MSTW parameterization and the experimental
measurements of $F_{2}^{p}(x,Q^{2})$.
| [
{
"created": "Tue, 22 Sep 2015 09:21:10 GMT",
"version": "v1"
}
] | 2015-10-23 | [
[
"Boroun",
"G. R.",
""
],
[
"Zarrin",
"S.",
""
],
[
"Teimoury",
"F.",
""
]
] | In this paper, we derive two second- order of differential equation for the gluon and singlet distribution functions by using the Laplace transform method. We decoupled the solutions of the singlet and gluon distributions into the initial conditions (function and derivative of the function) at the virtuality $Q_{0}^{2}$ separately as these solutions are defined by: \begin{eqnarray} F_{2}^{s}(x,Q^{2}) &=& \mathcal{F}(F_{s0}, \partial F_{s0})\nonumber &&\mathrm{and} \nonumber G(x,Q^{2}) &=& \mathcal{G}(G_{0}, \partial G_{0}).\nonumber \end{eqnarray} We compared our results with the MSTW parameterization and the experimental measurements of $F_{2}^{p}(x,Q^{2})$. |
2101.11912 | Rasulkhozha S. Sharafiddinov | R.B. Begzhanov and R.S. Sharafiddinov | CP-Symmetry in Scattering of Neutrinos from Nuclei | 7 pages, LaTex | Bull. Russ. Acad. Sci. Phys. 64 (2000) 1764-1769, Izv. Ross. Akad.
Nauk. 64 (2000) 2221-2227 | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The elastic scattering of longitudinal and transversal neutrinos on a
spinless nucleus have been discussed taking into account the charge, magnetic,
anapole and electric dipole moments of fermions and their weak neutral
currents. Compound structure of the neutrino interaction cross section with
nuclei have been defined. Invariance of the considered process concerning the C
- and P-operations have been investigated in the polarization type dependence.
| [
{
"created": "Thu, 28 Jan 2021 10:26:23 GMT",
"version": "v1"
}
] | 2021-01-29 | [
[
"Begzhanov",
"R. B.",
""
],
[
"Sharafiddinov",
"R. S.",
""
]
] | The elastic scattering of longitudinal and transversal neutrinos on a spinless nucleus have been discussed taking into account the charge, magnetic, anapole and electric dipole moments of fermions and their weak neutral currents. Compound structure of the neutrino interaction cross section with nuclei have been defined. Invariance of the considered process concerning the C - and P-operations have been investigated in the polarization type dependence. |
hep-ph/0107132 | Robert Foot | R. Foot | The mirror world interpretation of the 1908 Tunguska event and other
more recent events | 11 pages, Minor changes | ActaPhys.Polon.B32:3133,2001 | null | null | hep-ph astro-ph | null | Mirror matter is predicted to exist if parity (i.e. left-right symmetry) is a
symmetry of nature. Remarkably mirror matter is capable of simply explaining a
large number of contemporary puzzles in astrophysics and particle physics
including: Explanation of the MACHO gravitational microlensing events, the
existence of close-in extrasolar gas giant planets, apparently `isolated'
planets, the solar, atmospheric and LSND neutrino anomalies, the
orthopositronium lifetime anomaly and perhaps even gamma ray bursts. One
fascinating possibility is that our solar system contains small mirror matter
space bodies (asteroid or comet sized objects), which are too small to be
revealed from their gravitational effects but nevertheless have explosive
implications when they collide with the Earth. We examine the possibility that
the 1908 Tunguska explosion in Siberia was the result of the collision of a
mirror matter space body with the Earth. We point out that if the catastrophic
event and many other similar smaller events are manifestations of the mirror
world then these impact sites should be a good place to start digging for
mirror matter. Mirror matter could potentially be extracted and purified using
a centrifuge and have many useful industrial applications.
| [
{
"created": "Thu, 12 Jul 2001 00:55:17 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2001 07:11:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Foot",
"R.",
""
]
] | Mirror matter is predicted to exist if parity (i.e. left-right symmetry) is a symmetry of nature. Remarkably mirror matter is capable of simply explaining a large number of contemporary puzzles in astrophysics and particle physics including: Explanation of the MACHO gravitational microlensing events, the existence of close-in extrasolar gas giant planets, apparently `isolated' planets, the solar, atmospheric and LSND neutrino anomalies, the orthopositronium lifetime anomaly and perhaps even gamma ray bursts. One fascinating possibility is that our solar system contains small mirror matter space bodies (asteroid or comet sized objects), which are too small to be revealed from their gravitational effects but nevertheless have explosive implications when they collide with the Earth. We examine the possibility that the 1908 Tunguska explosion in Siberia was the result of the collision of a mirror matter space body with the Earth. We point out that if the catastrophic event and many other similar smaller events are manifestations of the mirror world then these impact sites should be a good place to start digging for mirror matter. Mirror matter could potentially be extracted and purified using a centrifuge and have many useful industrial applications. |
1611.05079 | Roman Pasechnik | K. Akiba, M. Akbiyik, M. Albrow, M. Arneodo, V. Avati, J. Baechler, O.
Villalobos Baillie, P. Bartalini, J. Bartels, S. Baur, C. Baus, W. Beaumont,
U. Behrens, D. Berge, M. Berretti, E. Bossini, R. Boussarie, S. Brodsky, M.
Broz, M. Bruschi, P. Bussey, W. Byczynski, J. C. Cabanillas Noris, E. Calvo
Villar, A. Campbell, F. Caporale, N. Cartiglia, W. Carvalho, G. Chachamis, E.
Chapon, C. Cheshkov, J. Chwastowski, R. Ciesielski, D. Chinellato, A. Cisek,
V. Coco, P. Collins, J. G. Contreras, B. Cox, D. de Jesus Damiao, P. Davis,
M. Deile, D. D'Enterria, D. Druzhkin, B. Duclou\'e, R. Dumps, R. Dzhelyadin,
P. Dziurdzia, M. Eliachevitch, P. Fassnacht, F. Ferro, S. Fichet, D.
Figueiredo, B. Field, D. Finogeev, R. Fiore, J. Forshaw, M. B. Gay Ducati, A.
Gago Medina, M. Gallinaro, A. Granik, G. von Gersdorff, S. Giani, K.
Golec-Biernat, V. P. Goncalves, P. G\"ottlicher, K. Goulianos, J.-Y.
Grosslord, L. A. Harland-Lang, H. Van Haevermaet, M. Hentschinski, R. Engel,
G. Herrera Corral, J. Hollar, L. Huertas, D. Johnson, I. Katkov, O. Kepka, M.
Khakzad, L. Kheyn, V. Khachatryan, V. A. Khoze, S. Klein, M. van Klundert, F.
Krauss, A. Kurepin, N. Kurepin, K. Kutak, E. Kuznetsova, G. Latino, P.
Lebiedowicz, B. Lenzi, E. Lewandowska, S. Liu, A. Luszczak, M. Luszczak, J.
D. Madrigal, M. Mangano, Z. Marcone, C. Marquet, A. D. Martin, T. Martin, M.
I. Martinez Hernandez, C. Martins, C. Mayer, R. Mc Nulty, P. Van Mechelen, R.
Macula, E. Melo da Costa, T. Mertzimekis, C. Mesropian, M. Mieskolainen, N.
Minafra, I. L. Monzon, L. Mundim, B. Murdaca, M. Murray, H. Niewiadowski, J.
Nystrand, E. G. de Oliveira, R. Orava, S. Ostapchenko, K. Osterberg, A.
Panagiotou, A. Papa, R. Pasechnik, T. Peitzmann, L. A. Perez Moreno, T.
Pierog, J. Pinfold, M. Poghosyan, M. E. Pol, W. Prado, V. Popov, M. Rangel,
A. Reshetin, J.-P. Revol, M. Rijssenbeek, M. Rodriguez, B. Roland, C. Royon,
M. Ruspa, M. Ryskin, A. Sabio Vera, G. Safronov, T. Sako, H. Schindler, D.
Salek, K. Safarik, M. Saimpert, A. Santoro, R. Schicker, J. Seger, S. Sen, A.
Shabanov, W. Schafer, G. Gil Da Silveira, P. Skands, R. Soluk, A. van
Spilbeeck, R. Staszewski, S. Stevenson, W.J. Stirling, M. Strikman, A.
Szczurek, L. Szymanowski, J. D. Tapia Takaki, M. Tasevsky, K. Taesoo, C.
Thomas, S. R. Torres, A. Tricomi, M. Trzebinski, D. Tsybychev, N. Turini, R.
Ulrich, E. Usenko, J. Varela, M. Lo Vetere, A. Villatoro Tello, A. Vilela
Pereira, D. Volyanskyy, S. Wallon, G. Wilkinson, H. W\"ohrmann, K. C. Zapp,
Y. Zoccarato (LHC Forward Physics Working Group) | LHC Forward Physics | 358 pages; authors added that were missing; minor fixes in
affiliations | J. Phys. G: Nucl. Part. Phys. 43 (2016) 110201 | 10.1088/0954-3899/43/11/110201 | CERN-PH-LPCC-2015-001, SLAC-PUB-16364, DESY 15-167 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of this report is to give a comprehensive overview of the rich field
of forward physics, with a special attention to the topics that can be studied
at the LHC. The report starts presenting a selection of the Monte Carlo
simulation tools currently available, chapter 2, then enters the rich
phenomenology of QCD at low, chapter 3, and high, chapter 4, momentum transfer,
while the unique scattering conditions of central exclusive production are
analyzed in chapter 5. The last two experimental topics, Cosmic Ray and Heavy
Ion physics are presented in the chapter 6 and 7 respectively. Chapter 8 is
dedicated to the BFKL dynamics, multiparton interactions, and saturation. The
report ends with an overview of the forward detectors at LHC. Each chapter is
correlated with a comprehensive bibliography, attempting to provide to the
interested reader with a wide opportunity for further studies.
| [
{
"created": "Tue, 15 Nov 2016 22:22:30 GMT",
"version": "v1"
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{
"created": "Sat, 9 Dec 2017 14:39:16 GMT",
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],
[
"Tricomi",
"A.",
"",
"LHC Forward Physics Working Group"
],
[
"Trzebinski",
"M.",
"",
"LHC Forward Physics Working Group"
],
[
"Tsybychev",
"D.",
"",
"LHC Forward Physics Working Group"
],
[
"Turini",
"N.",
"",
"LHC Forward Physics Working Group"
],
[
"Ulrich",
"R.",
"",
"LHC Forward Physics Working Group"
],
[
"Usenko",
"E.",
"",
"LHC Forward Physics Working Group"
],
[
"Varela",
"J.",
"",
"LHC Forward Physics Working Group"
],
[
"Vetere",
"M. Lo",
"",
"LHC Forward Physics Working Group"
],
[
"Tello",
"A. Villatoro",
"",
"LHC Forward Physics Working Group"
],
[
"Pereira",
"A. Vilela",
"",
"LHC Forward Physics Working Group"
],
[
"Volyanskyy",
"D.",
"",
"LHC Forward Physics Working Group"
],
[
"Wallon",
"S.",
"",
"LHC Forward Physics Working Group"
],
[
"Wilkinson",
"G.",
"",
"LHC Forward Physics Working Group"
],
[
"Wöhrmann",
"H.",
"",
"LHC Forward Physics Working Group"
],
[
"Zapp",
"K. C.",
"",
"LHC Forward Physics Working Group"
],
[
"Zoccarato",
"Y.",
"",
"LHC Forward Physics Working Group"
]
] | The goal of this report is to give a comprehensive overview of the rich field of forward physics, with a special attention to the topics that can be studied at the LHC. The report starts presenting a selection of the Monte Carlo simulation tools currently available, chapter 2, then enters the rich phenomenology of QCD at low, chapter 3, and high, chapter 4, momentum transfer, while the unique scattering conditions of central exclusive production are analyzed in chapter 5. The last two experimental topics, Cosmic Ray and Heavy Ion physics are presented in the chapter 6 and 7 respectively. Chapter 8 is dedicated to the BFKL dynamics, multiparton interactions, and saturation. The report ends with an overview of the forward detectors at LHC. Each chapter is correlated with a comprehensive bibliography, attempting to provide to the interested reader with a wide opportunity for further studies. |
2010.06358 | Abigail Keats MPhys | Fedor Bezrukov and Abigail Keats | Heavy Light Inflaton and Dark Matter Production | 9 pages, 4 figures | Phys. Rev. D 102, 115011 (2020) | 10.1103/PhysRevD.102.115011 | MAN/HEP/2020/010 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the minimal extension of the SM by a scalar with quartic interaction
serving as an inflaton. For the model where scale symmetry is broken only in
the inflaton sector, the mass of the inflaton is constrained to be relatively
low. Here, we analysed the previously omitted situation of the inflaton masses
$m_{\chi}\gtrsim 250\text{ GeV}$. Therefore, we provide a window of inflaton
masses with viable inflationary properties that evade direct observational
constraints, due to their small mixing with the Higgs sector. The addition of
heavy neutral leptons with Majorana masses induced by the interaction with the
inflaton allow for Cold Dark Matter in the model with masses $O(1-10)\text{
MeV}$.
| [
{
"created": "Tue, 13 Oct 2020 13:14:23 GMT",
"version": "v1"
}
] | 2021-01-04 | [
[
"Bezrukov",
"Fedor",
""
],
[
"Keats",
"Abigail",
""
]
] | We study the minimal extension of the SM by a scalar with quartic interaction serving as an inflaton. For the model where scale symmetry is broken only in the inflaton sector, the mass of the inflaton is constrained to be relatively low. Here, we analysed the previously omitted situation of the inflaton masses $m_{\chi}\gtrsim 250\text{ GeV}$. Therefore, we provide a window of inflaton masses with viable inflationary properties that evade direct observational constraints, due to their small mixing with the Higgs sector. The addition of heavy neutral leptons with Majorana masses induced by the interaction with the inflaton allow for Cold Dark Matter in the model with masses $O(1-10)\text{ MeV}$. |
0906.1452 | Shigehiro Yasui | Shigehiro Yasui, Kazutaka Sudoh | Exotic nuclei with open heavy flavor mesons | null | Phys.Rev.D80:034008,2009 | 10.1103/PhysRevD.80.034008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose stable exotic nuclei bound with $\bar{D}$ and $B$ mesons with
respecting heavy quark symmetry. We indicate that an approximate degeneracy of
$\bar{D}$($B$) and $\bar{D}^{*}$($B^{*}$) mesons plays an important role, and
discuss the stability of $\bar{D}N$ and $BN$ bound states. We find the binding
energies 1.4 MeV and 9.4 MeV for each state in the $J^{P}=1/2^{-}$ with I=0
channel. We discuss also possible existence of exotic nuclei $\bar{D}NN$ and
$BNN$.
| [
{
"created": "Mon, 8 Jun 2009 09:46:43 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jul 2009 05:47:57 GMT",
"version": "v2"
}
] | 2009-08-18 | [
[
"Yasui",
"Shigehiro",
""
],
[
"Sudoh",
"Kazutaka",
""
]
] | We propose stable exotic nuclei bound with $\bar{D}$ and $B$ mesons with respecting heavy quark symmetry. We indicate that an approximate degeneracy of $\bar{D}$($B$) and $\bar{D}^{*}$($B^{*}$) mesons plays an important role, and discuss the stability of $\bar{D}N$ and $BN$ bound states. We find the binding energies 1.4 MeV and 9.4 MeV for each state in the $J^{P}=1/2^{-}$ with I=0 channel. We discuss also possible existence of exotic nuclei $\bar{D}NN$ and $BNN$. |
hep-ph/0602139 | Sergey Ostapchenko | S. Ostapchenko | On the re-summation of enhanced Pomeron diagrams | null | Phys.Lett. B636 (2006) 40-45 | 10.1016/j.physletb.2006.03.026 | null | hep-ph | null | Dominant contributions of enhanced Pomeron diagrams to elastic hadron-hadron
scattering amplitude are re-summed to all orders. The formalism is applied to
calculate total hadronic cross sections and elastic scattering slopes. An
agreement with earlier results is obtained.
| [
{
"created": "Wed, 15 Feb 2006 13:17:44 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Ostapchenko",
"S.",
""
]
] | Dominant contributions of enhanced Pomeron diagrams to elastic hadron-hadron scattering amplitude are re-summed to all orders. The formalism is applied to calculate total hadronic cross sections and elastic scattering slopes. An agreement with earlier results is obtained. |
1305.4635 | Beranger Dumont | Beranger Dumont | Higgs Couplings after Moriond | 4 pages, 6 figures; to appear in the proceedings of the 48th
Rencontres de Moriond (QCD and High Energy Interactions), La Thuile, Italy,
March 9-16, 2013 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Performing fits to all publicly available data, we analyze the extent to
which the latest results from the LHC and Tevatron (including new results
presented at the Rencontres de Moriond) constrain the couplings of the Higgs
boson-like state at ~ 125 GeV, as well as possible decays into invisible
particles.
| [
{
"created": "Mon, 20 May 2013 20:00:01 GMT",
"version": "v1"
}
] | 2013-05-22 | [
[
"Dumont",
"Beranger",
""
]
] | Performing fits to all publicly available data, we analyze the extent to which the latest results from the LHC and Tevatron (including new results presented at the Rencontres de Moriond) constrain the couplings of the Higgs boson-like state at ~ 125 GeV, as well as possible decays into invisible particles. |
0810.2448 | Guray Erkol | G. Erkol, M. Oka, G. Turan | QCD Sum Rules study of meson-baryon sigma terms | 17 pages, 10 figures, to be published in Phys. Rev. D | Phys.Rev.D78:094003,2008 | 10.1103/PhysRevD.78.094003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pion-baryon sigma terms and the strange-quark condensates of the octet
and the decuplet baryons are calculated by employing the method of quantum
chromodynamics (QCD) sum rules. We evaluate the vacuum-to-vacuum transition
matrix elements of two baryon interpolating fields in an external
isoscalar-scalar field and use a Monte Carlo-based approach to systematically
analyze the sum rules and the uncertainties in the results. We extract the
ratios of the sigma terms, which have rather high accuracy and minimal
dependence on QCD parameters. We discuss the sources of uncertainties and
comment on possible strangeness content of the nucleon and the Delta.
| [
{
"created": "Tue, 14 Oct 2008 13:34:35 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Erkol",
"G.",
""
],
[
"Oka",
"M.",
""
],
[
"Turan",
"G.",
""
]
] | The pion-baryon sigma terms and the strange-quark condensates of the octet and the decuplet baryons are calculated by employing the method of quantum chromodynamics (QCD) sum rules. We evaluate the vacuum-to-vacuum transition matrix elements of two baryon interpolating fields in an external isoscalar-scalar field and use a Monte Carlo-based approach to systematically analyze the sum rules and the uncertainties in the results. We extract the ratios of the sigma terms, which have rather high accuracy and minimal dependence on QCD parameters. We discuss the sources of uncertainties and comment on possible strangeness content of the nucleon and the Delta. |
0902.4446 | Gerhard Buchalla | M. Beneke, G. Buchalla, M. Neubert, C.T. Sachrajda | Penguins with Charm and Quark-Hadron Duality | 20 pages, 4 figures | Eur.Phys.J.C61:439-449,2009 | 10.1140/epjc/s10052-009-1028-9 | CERN-PH-TH/2009-021 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The integrated branching fraction of the process $B\to X_s l^+l^-$ is
dominated by resonance background from narrow charmonium states, such as $B\to
X_s\psi\to X_s l^+l^-$, which exceeds the non-resonant charm-loop contribution
by two orders of magnitude. The origin of this fact is discussed in view of the
general expectation of quark-hadron duality. The situation in $B\to X_s l^+l^-$
is contrasted with charm-penguin amplitudes in two-body hadronic B decays of
the type $B\to\pi\pi$, for which it is demonstrated that resonance effects and
the potentially non-perturbative $c\bar c$ threshold region do not invalidate
the standard picture of QCD factorization. This holds irrespective of whether
the charm quark is treated as a light or a heavy quark.
| [
{
"created": "Wed, 25 Feb 2009 19:16:38 GMT",
"version": "v1"
}
] | 2009-07-22 | [
[
"Beneke",
"M.",
""
],
[
"Buchalla",
"G.",
""
],
[
"Neubert",
"M.",
""
],
[
"Sachrajda",
"C. T.",
""
]
] | The integrated branching fraction of the process $B\to X_s l^+l^-$ is dominated by resonance background from narrow charmonium states, such as $B\to X_s\psi\to X_s l^+l^-$, which exceeds the non-resonant charm-loop contribution by two orders of magnitude. The origin of this fact is discussed in view of the general expectation of quark-hadron duality. The situation in $B\to X_s l^+l^-$ is contrasted with charm-penguin amplitudes in two-body hadronic B decays of the type $B\to\pi\pi$, for which it is demonstrated that resonance effects and the potentially non-perturbative $c\bar c$ threshold region do not invalidate the standard picture of QCD factorization. This holds irrespective of whether the charm quark is treated as a light or a heavy quark. |
hep-ph/9909564 | Matthias Neubert | Matthias Neubert (SLAC) | Model-independent information on gamma from B^+- -> pi K Decays | 10 pages, 5 figures, uses espcrc2.sty (included); invited talk
presented at the High-Energy Physics International Euroconference on Quantum
Chromo-Dynamics (QCD 99), Montpellier, France, 7--13 July 1999 | Nucl.Phys.Proc.Suppl.86:477-486,2000 | 10.1016/S0920-5632(00)00607-1 | SLAC-PUB-8266 | hep-ph | null | Measurements of the rates for the hadronic decays B^+- -> pi K can be used to
derive information on the weak phase gamma=arg(V_ub^*) in a largely
model-independent way. Hadronic uncertainties can be reduced to the level of
nonfactorizable contributions to the decay amplitudes that are power-suppressed
in Lambda/m_b and, in addition, either violate SU(3) flavor symmetry or are
doubly Cabibbo suppressed. Various strategies to obtain bounds on gamma and to
extract its value with small theoretical uncertainty are described. The
potential of B^+- -> pi K decays for probing physics beyond the Standard Model
is also discussed.
| [
{
"created": "Thu, 30 Sep 1999 03:52:25 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Neubert",
"Matthias",
"",
"SLAC"
]
] | Measurements of the rates for the hadronic decays B^+- -> pi K can be used to derive information on the weak phase gamma=arg(V_ub^*) in a largely model-independent way. Hadronic uncertainties can be reduced to the level of nonfactorizable contributions to the decay amplitudes that are power-suppressed in Lambda/m_b and, in addition, either violate SU(3) flavor symmetry or are doubly Cabibbo suppressed. Various strategies to obtain bounds on gamma and to extract its value with small theoretical uncertainty are described. The potential of B^+- -> pi K decays for probing physics beyond the Standard Model is also discussed. |
1506.06846 | Hong-Shi Zong | Shu-Sheng Xu, Yan Yan, Zhu-Fang Cui, and Hong-Shi Zong | 2+1 flavors QCD equation of state at zero temperature within
Dyson-Schwinger equations | 7 pages, 6 figures | null | 10.1142/S0217751X15502176 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of Dyson-Schwinger equations (DSEs), we discuss the
equation of state (EOS) and quark number densities of 2+1 flavors, that is to
say, $u$, $d$, and $s$ quarks. The chemical equilibrium and electric charge
neutrality conditions are used to constrain the chemical potential of different
quarks. The EOS in the cases of 2 flavors and 2+1 flavors are discussed, and
the quark number densities, the pressure, and energy density per baryon are
also studied. The results show that there is a critical chemical potential for
each flavor of quark, at which the quark number density turns to nonzero from
0; and furthermore, the system with 2+1 flavors of quarks is more stable than
that with 2 flavors in the system. These discussion may provide some useful
information to some research fields, such as the studies related to the QCD
phase transitions or compact stars.
| [
{
"created": "Tue, 23 Jun 2015 02:45:04 GMT",
"version": "v1"
}
] | 2016-01-20 | [
[
"Xu",
"Shu-Sheng",
""
],
[
"Yan",
"Yan",
""
],
[
"Cui",
"Zhu-Fang",
""
],
[
"Zong",
"Hong-Shi",
""
]
] | Within the framework of Dyson-Schwinger equations (DSEs), we discuss the equation of state (EOS) and quark number densities of 2+1 flavors, that is to say, $u$, $d$, and $s$ quarks. The chemical equilibrium and electric charge neutrality conditions are used to constrain the chemical potential of different quarks. The EOS in the cases of 2 flavors and 2+1 flavors are discussed, and the quark number densities, the pressure, and energy density per baryon are also studied. The results show that there is a critical chemical potential for each flavor of quark, at which the quark number density turns to nonzero from 0; and furthermore, the system with 2+1 flavors of quarks is more stable than that with 2 flavors in the system. These discussion may provide some useful information to some research fields, such as the studies related to the QCD phase transitions or compact stars. |
2309.06246 | Coleridge Faraday | Coleridge Faraday, W. A. Horowitz | Assumption Breakdown in Radiative Energy Loss | Contribution to SAIP 2023, 6 pages, 2 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that an integral assumption in DGLV radiative energy loss - the large
formation time assumption - is violated at high-$p_T$ for phenomenologically
relevant parameters. We further investigate the phenomenological impact of
placing a new kinematic bound on the radiated gluon transverse momentum, which
ensures that there are no contributions to the energy loss from regions of
parameter space that violate the large formation time assumption. We find that
this places a large sensitivity on the exact kinematic cutoff used, similar to
the known collinear cutoff sensitivity, indicating the theoretical need for a
rederivation of DGLV radiative energy with the large formation time assumption
relaxed in order to make rigorous predictions. We additionally find that this
large formation time cutoff dramatically reduces the size of a short pathlength
correction to the DGLV radiative energy loss, which is of phenomenological
interest in predicting suppression in small $p +A$ systems. We compute the
phenomenological predictions utilizing this large formation time cutoff in both
$p+A$ and $A+A$ collisions at the LHC, in a convolved radiative and elastic
energy loss model.
| [
{
"created": "Tue, 12 Sep 2023 14:01:48 GMT",
"version": "v1"
}
] | 2023-09-13 | [
[
"Faraday",
"Coleridge",
""
],
[
"Horowitz",
"W. A.",
""
]
] | We show that an integral assumption in DGLV radiative energy loss - the large formation time assumption - is violated at high-$p_T$ for phenomenologically relevant parameters. We further investigate the phenomenological impact of placing a new kinematic bound on the radiated gluon transverse momentum, which ensures that there are no contributions to the energy loss from regions of parameter space that violate the large formation time assumption. We find that this places a large sensitivity on the exact kinematic cutoff used, similar to the known collinear cutoff sensitivity, indicating the theoretical need for a rederivation of DGLV radiative energy with the large formation time assumption relaxed in order to make rigorous predictions. We additionally find that this large formation time cutoff dramatically reduces the size of a short pathlength correction to the DGLV radiative energy loss, which is of phenomenological interest in predicting suppression in small $p +A$ systems. We compute the phenomenological predictions utilizing this large formation time cutoff in both $p+A$ and $A+A$ collisions at the LHC, in a convolved radiative and elastic energy loss model. |
hep-ph/9807417 | null | U. Baur (SUNY Buffalo), S. Keller (Fermilab), and D. Wackeroth (PSI) | Electroweak Radiative Corrections to W Boson Production in Hadronic
Collisions | 38 pages, Revtex, 13 embedded postscript figures | Phys.Rev. D59 (1999) 013002 | 10.1103/PhysRevD.59.013002 | Fermilab-Pub-98/164-T | hep-ph | null | The O(\alpha) electroweak radiative corrections to the process pp, ppbar\to W
\to\ell^\pm\nu (\ell=e,\mu) are calculated. The O(\alpha) corrections can be
decomposed into separately gauge invariant contributions to the W boson
production and decay processes. Factorizing the collinear singularity
associated with initial state photon radiation into the parton distribution
functions, we find that initial state corrections have a significantly smaller
effect than final state radiative corrections. We study in detail the effect of
electroweak radiative corrections on a number of interesting observables: the W
transverse mass distribution, the W to Z transverse mass ratio, the charge
asymmetry of leptons in W\to\ell\nu decays, as well as the W production cross
section and the W to Z cross section ratio. We also investigate how
experimental lepton identification requirements change the effect of the
electroweak corrections.
| [
{
"created": "Sun, 19 Jul 1998 14:28:40 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Baur",
"U.",
"",
"SUNY Buffalo"
],
[
"Keller",
"S.",
"",
"Fermilab"
],
[
"Wackeroth",
"D.",
"",
"PSI"
]
] | The O(\alpha) electroweak radiative corrections to the process pp, ppbar\to W \to\ell^\pm\nu (\ell=e,\mu) are calculated. The O(\alpha) corrections can be decomposed into separately gauge invariant contributions to the W boson production and decay processes. Factorizing the collinear singularity associated with initial state photon radiation into the parton distribution functions, we find that initial state corrections have a significantly smaller effect than final state radiative corrections. We study in detail the effect of electroweak radiative corrections on a number of interesting observables: the W transverse mass distribution, the W to Z transverse mass ratio, the charge asymmetry of leptons in W\to\ell\nu decays, as well as the W production cross section and the W to Z cross section ratio. We also investigate how experimental lepton identification requirements change the effect of the electroweak corrections. |
1302.6133 | Joel Jones-Perez | Joel Jones-Perez | RGE behaviour of U(2)^3 symmetry in SUSY | 7 pages, 4 figures. To appear in the proceedings of DISCRETE 2012 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the naturalness point of view, the first LHC results seem to disfavour
any constrained MSSM realization with universal conditions at the SUSY-breaking
scale. A more motivated scenario is given by split-family SUSY, in which the
first two generations of squarks are heavy, compatible with a U(2)^3 flavour
symmetry. Here, after reviewing the flavour structures obtained in this
framework, we consider the flavour symmetry to be broken at a very high scale,
and study the consequences at low energies through its RGE evolution. Initial
conditions compatible with a split scenario are found, and the preservation of
correlations from minimal U(2)^3 breaking are checked.
| [
{
"created": "Mon, 25 Feb 2013 16:11:39 GMT",
"version": "v1"
}
] | 2013-02-26 | [
[
"Jones-Perez",
"Joel",
""
]
] | From the naturalness point of view, the first LHC results seem to disfavour any constrained MSSM realization with universal conditions at the SUSY-breaking scale. A more motivated scenario is given by split-family SUSY, in which the first two generations of squarks are heavy, compatible with a U(2)^3 flavour symmetry. Here, after reviewing the flavour structures obtained in this framework, we consider the flavour symmetry to be broken at a very high scale, and study the consequences at low energies through its RGE evolution. Initial conditions compatible with a split scenario are found, and the preservation of correlations from minimal U(2)^3 breaking are checked. |
1301.4004 | Yao De-Liang | Meng Shi, De-Liang Yao, Han-Qing Zheng | Studies on X(4260) and X(4660) particles | Talk given by H. Q. Zheng at "Xth Quark Confinement and the Hadron
Spectrum", October 8-12, 2012, TUM Campus Garching, Munich, Germany. 6 pages,
3 figures, 3 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Studies on the X(4260) and X(4660) resonant states in an effective lagrangian
approach are reviewed. Using a Breit--Wigner propagator to describe their
propagation, we find that the X(4260) has a sizable coupling to the
$\omega\chi_{c0}$ channel, while other couplings are found to be negligible.
Besides, it couples much stronger to $\sigma$ than to $f_0(980)$: $|g_{X\Psi
\sigma}^2/g^2_{X\Psi f_0(980)}|\sim O(10) \ .$ As an approximate result for
X(4660), we obtain that the ratio of
$\frac{Br(X\rightarrow\Lambda_c^+\Lambda_c^-)}{Br(X\rightarrow\Psi(2s)\pi^+\pi^-)}\simeq
20$. Finally, taking X(3872) as an example, we also point out a possible way to
extend the previous method to a more general one in the effective lagrangian
approach.
| [
{
"created": "Thu, 17 Jan 2013 08:30:57 GMT",
"version": "v1"
}
] | 2013-01-18 | [
[
"Shi",
"Meng",
""
],
[
"Yao",
"De-Liang",
""
],
[
"Zheng",
"Han-Qing",
""
]
] | Studies on the X(4260) and X(4660) resonant states in an effective lagrangian approach are reviewed. Using a Breit--Wigner propagator to describe their propagation, we find that the X(4260) has a sizable coupling to the $\omega\chi_{c0}$ channel, while other couplings are found to be negligible. Besides, it couples much stronger to $\sigma$ than to $f_0(980)$: $|g_{X\Psi \sigma}^2/g^2_{X\Psi f_0(980)}|\sim O(10) \ .$ As an approximate result for X(4660), we obtain that the ratio of $\frac{Br(X\rightarrow\Lambda_c^+\Lambda_c^-)}{Br(X\rightarrow\Psi(2s)\pi^+\pi^-)}\simeq 20$. Finally, taking X(3872) as an example, we also point out a possible way to extend the previous method to a more general one in the effective lagrangian approach. |
hep-ph/0612195 | Joern Kersten | Joern Kersten | SUSY at the Pole | 3 pages; talk given at NOW 2006, Conca Specchiulla, Italy, September
9-16, 2006; v2: reference added | Nucl.Phys.Proc.Suppl.168:277-279,2007 | 10.1016/j.nuclphysbps.2007.02.024 | null | hep-ph | null | We study the role neutrino telescopes could play in discovering
supersymmetric extensions of the Standard Model with a long-lived stau
next-to-lightest superparticle. In such a setup, pairs of staus are produced by
cosmic neutrino interactions in the Earth matter. In optimistic scenarios, one
can expect several pair events per year in a cubic kilometer detector such as
IceCube. We also show that no significant event rate can be expected for decays
of staus stopped in the detector.
| [
{
"created": "Fri, 15 Dec 2006 14:47:47 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2007 18:04:00 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kersten",
"Joern",
""
]
] | We study the role neutrino telescopes could play in discovering supersymmetric extensions of the Standard Model with a long-lived stau next-to-lightest superparticle. In such a setup, pairs of staus are produced by cosmic neutrino interactions in the Earth matter. In optimistic scenarios, one can expect several pair events per year in a cubic kilometer detector such as IceCube. We also show that no significant event rate can be expected for decays of staus stopped in the detector. |
hep-ph/0605094 | Seungwon Baek | Seungwon Baek | New physics in $B \to \pi \pi$ and $B \to \pi K$ decays | 17 pages; Added references, Corrected typos | JHEP 0607 (2006) 025 | 10.1088/1126-6708/2006/07/025 | null | hep-ph | null | We perform a combined analysis of $B \to \pi \pi$ and $B \to \pi K$ decays
with the current experimental data. Assuming SU(3) flavor symmetry and no new
physics contributions to the topological amplitudes, we demonstrate that the
conventional parametrization in the Standard Model (SM) does not describe the
data very well, in contrast with a similar analysis based on the earlier data.
It is also shown that the introduction of smaller amplitudes and reasonable
SU(3) breaking parameters does not improve the fits much. Interpreting these
puzzling behaviors in the SM as a new physics (NP) signal, we study various NP
scenarios. We find that when a single NP amplitude dominates, the NP in the
electroweak penguin sector is the most favorable. However, other NP solutions,
such as NP residing in the QCD-penguin sector and color-suppressed electroweak
penguin sector simultaneously, can also solve the puzzle.
| [
{
"created": "Tue, 9 May 2006 05:54:05 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2006 07:51:59 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Baek",
"Seungwon",
""
]
] | We perform a combined analysis of $B \to \pi \pi$ and $B \to \pi K$ decays with the current experimental data. Assuming SU(3) flavor symmetry and no new physics contributions to the topological amplitudes, we demonstrate that the conventional parametrization in the Standard Model (SM) does not describe the data very well, in contrast with a similar analysis based on the earlier data. It is also shown that the introduction of smaller amplitudes and reasonable SU(3) breaking parameters does not improve the fits much. Interpreting these puzzling behaviors in the SM as a new physics (NP) signal, we study various NP scenarios. We find that when a single NP amplitude dominates, the NP in the electroweak penguin sector is the most favorable. However, other NP solutions, such as NP residing in the QCD-penguin sector and color-suppressed electroweak penguin sector simultaneously, can also solve the puzzle. |
2002.05031 | Ronan McNulty | R. McNulty, V.A. Khoze, A.D. Martin and M.G. Ryskin | Isolating the Odderon in central production in high energy $pA$ and $AA$
collisions | 19 pages, 4 figures. Version published in EPJC containing extra
references | Eur. Phys. J. C 80, 288 (2020) | 10.1140/epjc/s10052-020-7846-5 | IPPP/20/2 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the rapidity dependence of the cross section on the rapidity of the
central exclusive production cross sections of C-even mesons in $pA$ and $AA$
collisions, where $A$ is a heavy ion. We observe qualitatively different
behaviour of the contributions arising from $\gamma$-Odderon and
Pomeron-Pomeron fusion mechanisms. This can be used to extract the Odderon
signal from the events of $f_2$ mesons exclusively produced in the forward
region. Estimates, obtained using expected values of the Odderon cross section,
indicate that the $\gamma$-Odderon contribution may exceed by a few times the
Pomeron-induced background in Pb-Pb collisions. Moreover, the Odderon effect
can be clearly seen in terms of the asymmetry in $pA$ and $AA$ collisions with
the beam and target reversed. It is particularly interesting to note that the
asymmetry for $\gamma$-Odderon fusion reaches its maximum value close to 1 in
the forward direction, whereas the asymmetry for the Pomeron-Pomeron fusion
contribution is small. The role of additional interactions of the $f_2$ meson
with nucleons in the heavy ion, and also the contributions from secondary
Reggeons, are estimated. The photon-Odderon contribution has a large
normalisation uncertainty but the enhances cross-section in the forward region
combined with a large asymmetry increases the chance of experimentally
detecting the Odderon.
| [
{
"created": "Wed, 12 Feb 2020 14:43:15 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2020 08:15:15 GMT",
"version": "v2"
}
] | 2020-04-07 | [
[
"McNulty",
"R.",
""
],
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We study the rapidity dependence of the cross section on the rapidity of the central exclusive production cross sections of C-even mesons in $pA$ and $AA$ collisions, where $A$ is a heavy ion. We observe qualitatively different behaviour of the contributions arising from $\gamma$-Odderon and Pomeron-Pomeron fusion mechanisms. This can be used to extract the Odderon signal from the events of $f_2$ mesons exclusively produced in the forward region. Estimates, obtained using expected values of the Odderon cross section, indicate that the $\gamma$-Odderon contribution may exceed by a few times the Pomeron-induced background in Pb-Pb collisions. Moreover, the Odderon effect can be clearly seen in terms of the asymmetry in $pA$ and $AA$ collisions with the beam and target reversed. It is particularly interesting to note that the asymmetry for $\gamma$-Odderon fusion reaches its maximum value close to 1 in the forward direction, whereas the asymmetry for the Pomeron-Pomeron fusion contribution is small. The role of additional interactions of the $f_2$ meson with nucleons in the heavy ion, and also the contributions from secondary Reggeons, are estimated. The photon-Odderon contribution has a large normalisation uncertainty but the enhances cross-section in the forward region combined with a large asymmetry increases the chance of experimentally detecting the Odderon. |
hep-ph/0201263 | Dr. Jayanta Kumar Sarma | R. Rajkhowa and J. K. Sarma | Complete solutions of Altarelli-Parisi evolution equations in leading
order and structure functions at low-x | 15 pages, 12 figures | null | null | null | hep-ph | null | We present comlete solutions of singlet and non-singlet Altarelli-Parisi (AP)
evolution equations in leading order at low-x. We obtain t-evolutions of proton
and neutron structure functions and x-evolutions of deuteron structure
functions at low-x from AP evolution eqiations. The results of t-evolutions are
compared with HERA low-x and low-Q^2 data and those of x-evolutions are
compared with NMC low-x and low-Q^2 data. Also we compare our results with
those of general solutions of AP evolution equations.
| [
{
"created": "Tue, 29 Jan 2002 06:57:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rajkhowa",
"R.",
""
],
[
"Sarma",
"J. K.",
""
]
] | We present comlete solutions of singlet and non-singlet Altarelli-Parisi (AP) evolution equations in leading order at low-x. We obtain t-evolutions of proton and neutron structure functions and x-evolutions of deuteron structure functions at low-x from AP evolution eqiations. The results of t-evolutions are compared with HERA low-x and low-Q^2 data and those of x-evolutions are compared with NMC low-x and low-Q^2 data. Also we compare our results with those of general solutions of AP evolution equations. |
1703.06913 | Orlando Panella | O. Panella, R. Leonardi, G. Pancheri, Y. N. Srivastava, M. Narain and
U. Heintz | Production of exotic composite quarks at the LHC | 14 pages, 10 figures | Phys. Rev. D 96, 075034 (2017) | 10.1103/PhysRevD.96.075034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the production at the LHC of exotic composite quarks of charge
$Q=+(5/3) e$ and $Q=-(4/3) e$. Such states are predicted in composite models of
higher isospin multiplets ($I_W=1$ or $I_W=3/2$). Given their exotic charges
(such as $5/3$), their decays proceed through the electroweak interactions. We
compute decay widths and rates for resonant production of the exotic quarks at
the LHC. Partly motivated by the recent observation of an excess by the CMS
collaboration in the $e\not p_T jj$ final state signature we focus on $ pp \to
U^+ j \to W^+ + j\, j\, \to \ell^+\not p_T jj$ and then perform a fast
simulation of the detector reconstruction based on DELPHES. We then scan the
parameter space of the model ($m_*=\Lambda$) and study the statistical
significance of the signal against the relevant standard model background
($Wjj$ followed by leptonic decay of the $W$ gauge boson) providing the
luminosity curves as function of $m_*$ for discovery at 3- and 5-$\sigma$
level.
| [
{
"created": "Mon, 20 Mar 2017 18:28:51 GMT",
"version": "v1"
}
] | 2017-11-01 | [
[
"Panella",
"O.",
""
],
[
"Leonardi",
"R.",
""
],
[
"Pancheri",
"G.",
""
],
[
"Srivastava",
"Y. N.",
""
],
[
"Narain",
"M.",
""
],
[
"Heintz",
"U.",
""
]
] | We consider the production at the LHC of exotic composite quarks of charge $Q=+(5/3) e$ and $Q=-(4/3) e$. Such states are predicted in composite models of higher isospin multiplets ($I_W=1$ or $I_W=3/2$). Given their exotic charges (such as $5/3$), their decays proceed through the electroweak interactions. We compute decay widths and rates for resonant production of the exotic quarks at the LHC. Partly motivated by the recent observation of an excess by the CMS collaboration in the $e\not p_T jj$ final state signature we focus on $ pp \to U^+ j \to W^+ + j\, j\, \to \ell^+\not p_T jj$ and then perform a fast simulation of the detector reconstruction based on DELPHES. We then scan the parameter space of the model ($m_*=\Lambda$) and study the statistical significance of the signal against the relevant standard model background ($Wjj$ followed by leptonic decay of the $W$ gauge boson) providing the luminosity curves as function of $m_*$ for discovery at 3- and 5-$\sigma$ level. |
hep-ph/0402123 | Aseshkrishna Datta | Asesh K. Datta | MSSM Higgs Boson Production from Supersymmetric Cascades at LHC | 4 pages, 1 PS figure, uses rotating_pr.sty and ws-procs9x6.cls Talk
presented at SUSY03, Tucson, Arizona; to appear in the proceedings | null | null | UFIFT-HEP-04-2 | hep-ph | null | Detectability of MSSM Higgs bosons in cascade decays of supersymmetric
particles at the CERN LHC is discussed.
| [
{
"created": "Wed, 11 Feb 2004 19:29:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Datta",
"Asesh K.",
""
]
] | Detectability of MSSM Higgs bosons in cascade decays of supersymmetric particles at the CERN LHC is discussed. |
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