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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2009.03540
|
Alexander Boulton McKeehan
|
Ishira Fernando, Sean Hackett, Alex Boulton-McKeehan
|
Targeted Exploration of Dark Photon Parameter Space at Mu3e
| null | null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In 2016, the Atomki collaboration discovered an anomaly in the decay of
beryllium excited states that matched theoretical predictions for an unknown
force-carrying boson. We suggest a search for such a hypothesized `dark photon'
over the same parameter space to be carried out at the Mu3e detector. We
discuss the mechanisms by which a dark photon may be observed, and outline the
details of this detector experiment. We extrapolate on this groundwork to
analyze projections for the sensitivity of the experiment. Additionally, we
quantify the expected precision of the measurements and how the resulting data
would indicate the existence of a dark photon. Finally, we discuss potential
challenges of the proposed search at Mu3e.
|
[
{
"created": "Tue, 8 Sep 2020 06:29:59 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Sep 2020 03:17:08 GMT",
"version": "v2"
}
] |
2020-09-10
|
[
[
"Fernando",
"Ishira",
""
],
[
"Hackett",
"Sean",
""
],
[
"Boulton-McKeehan",
"Alex",
""
]
] |
In 2016, the Atomki collaboration discovered an anomaly in the decay of beryllium excited states that matched theoretical predictions for an unknown force-carrying boson. We suggest a search for such a hypothesized `dark photon' over the same parameter space to be carried out at the Mu3e detector. We discuss the mechanisms by which a dark photon may be observed, and outline the details of this detector experiment. We extrapolate on this groundwork to analyze projections for the sensitivity of the experiment. Additionally, we quantify the expected precision of the measurements and how the resulting data would indicate the existence of a dark photon. Finally, we discuss potential challenges of the proposed search at Mu3e.
|
1808.01950
|
Rafael Pav\~ao
|
R. Pavao and E. Oset
|
Coupled channels dynamics in the generation of the $\Omega (2012)$
resonance
|
11 pages, 8 figures
| null |
10.1140/epjc/s10052-018-6329-4
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We look into the newly observed $\Omega (2012)$ state from the molecular
perspective in which the resonance is generated from the $\bar{K} \Xi^*$, $\eta
\Omega$ and $\bar{K} \Xi$ channels. We find that this picture provides a
natural explanation of the properties of the $\Omega (2012)$ state. We stress
that the molecular nature of the resonance is revealed with a large coupling of
the $\Omega (2012)$ to the $\bar{K} \Xi^*$ channel, that can be observed in the
$\Omega (2012) \rightarrow \bar{K} \pi \Xi$ decay which is incorporated
automatically in our chiral unitary approach via the use of the spectral
function of $\Xi^*$ in the evaluation of the $\bar{K} \Xi^*$ loop function.
|
[
{
"created": "Mon, 6 Aug 2018 14:54:51 GMT",
"version": "v1"
}
] |
2018-11-14
|
[
[
"Pavao",
"R.",
""
],
[
"Oset",
"E.",
""
]
] |
We look into the newly observed $\Omega (2012)$ state from the molecular perspective in which the resonance is generated from the $\bar{K} \Xi^*$, $\eta \Omega$ and $\bar{K} \Xi$ channels. We find that this picture provides a natural explanation of the properties of the $\Omega (2012)$ state. We stress that the molecular nature of the resonance is revealed with a large coupling of the $\Omega (2012)$ to the $\bar{K} \Xi^*$ channel, that can be observed in the $\Omega (2012) \rightarrow \bar{K} \pi \Xi$ decay which is incorporated automatically in our chiral unitary approach via the use of the spectral function of $\Xi^*$ in the evaluation of the $\bar{K} \Xi^*$ loop function.
|
0810.4309
|
Melina G\'omez-Bock
|
M. Gomez-Bock
|
Deviations from universality of slepton masses in the MSSM
|
13 pages, 3 figures
|
Rev.Mex.Fis.54:30-34,2008
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we propose an ansatz that applies to the slepton mass matrices.
In our approach these matrices contain a dominant sector that can be
diagonalized exactly. We study the numerical results for the slepton mass
eigenstates, looking for deviations from universality, which is usually assumed
when one evaluates the production of sleptons at future colliders.
|
[
{
"created": "Thu, 23 Oct 2008 15:49:32 GMT",
"version": "v1"
}
] |
2009-01-07
|
[
[
"Gomez-Bock",
"M.",
""
]
] |
In this paper we propose an ansatz that applies to the slepton mass matrices. In our approach these matrices contain a dominant sector that can be diagonalized exactly. We study the numerical results for the slepton mass eigenstates, looking for deviations from universality, which is usually assumed when one evaluates the production of sleptons at future colliders.
|
hep-ph/9708223
|
Yukinari Sumino
|
M. Peter and Y. Sumino
|
Final-State Interactions in e^+e^- -> t\bar{t} -> b l^+ \nu \bar{b} W^-
Near Top Quark Threshold
|
Section 6 is enlarged substantially and a paragraph is added to
Section 8 correspondingly. Reference list is also improved. (27 pages
including figures, LaTeX)
|
Phys. Rev. D 57, 6912 (1998)
|
10.1103/PhysRevD.57.6912
|
TTP-97-27
|
hep-ph
| null |
We calculate final-state interaction corrections to the energy-angular
distribution of l^+ in semi-leptonic top quark decay, where the parent top
quark is produced via e^+e^- -> t\bar{t} near threshold. These are the
corrections due to gluon exchange between t and \bar{b} (\bar{t} and b) and
between b and \bar{b}. Combining with previously known other corrections, we
explicitly write down the l^+ energy-angular distribution including the full
O(alpha_s)=O(beta) corrections near t\bar{t} threshold. Numerical analyses of
the final-state interaction corrections are given. We find that they deform the
l^+ distribution typically at the 10% level. We also find that all qualitative
features of the numerical results can be understood from intuitive pictures.
The mechanisms of various effects of the final-state interactions are
elucidated. Finally we define an observable which is proper to the decay
process of the top quark (dependent only on d\Gamma_{t -> b l^+ \nu}/ dE_l
d\Omega_l of a free polarized top quark) near t\bar{t} threshold. Such a
quantity will be useful in extracting the decay property of the top quark using
the highly polarized top quark samples.
|
[
{
"created": "Mon, 4 Aug 1997 11:04:14 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 1997 18:02:33 GMT",
"version": "v2"
}
] |
2016-08-25
|
[
[
"Peter",
"M.",
""
],
[
"Sumino",
"Y.",
""
]
] |
We calculate final-state interaction corrections to the energy-angular distribution of l^+ in semi-leptonic top quark decay, where the parent top quark is produced via e^+e^- -> t\bar{t} near threshold. These are the corrections due to gluon exchange between t and \bar{b} (\bar{t} and b) and between b and \bar{b}. Combining with previously known other corrections, we explicitly write down the l^+ energy-angular distribution including the full O(alpha_s)=O(beta) corrections near t\bar{t} threshold. Numerical analyses of the final-state interaction corrections are given. We find that they deform the l^+ distribution typically at the 10% level. We also find that all qualitative features of the numerical results can be understood from intuitive pictures. The mechanisms of various effects of the final-state interactions are elucidated. Finally we define an observable which is proper to the decay process of the top quark (dependent only on d\Gamma_{t -> b l^+ \nu}/ dE_l d\Omega_l of a free polarized top quark) near t\bar{t} threshold. Such a quantity will be useful in extracting the decay property of the top quark using the highly polarized top quark samples.
|
hep-ph/9403372
| null |
R. Delbourgo and Dongsheng Liu (University of Tasmania)
|
Heavy Meson Decays into Light Resonances
|
20 RevTex pages, Preprint # UTAS-PHYS-94-04
|
Phys.Rev.D51:118-131,1995
|
10.1103/PhysRevD.51.118
| null |
hep-ph
| null |
We analyse the Lorentz structures of weak decay matrix elements bewteen meson
states of arbitrary spin. Simplifications arise in the transition amplitudes
for a heavy meson decaying into a light one via a Bethe-Salpeter approach which
incorporates heavy quark symmetry. Phenomenological consequences on several
semileptonic, nonleptonic and FCNC induced decays of heavy flavoured mesons are
derived and discussed.
|
[
{
"created": "Mon, 28 Mar 1994 20:47:00 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Delbourgo",
"R.",
"",
"University of Tasmania"
],
[
"Liu",
"Dongsheng",
"",
"University of Tasmania"
]
] |
We analyse the Lorentz structures of weak decay matrix elements bewteen meson states of arbitrary spin. Simplifications arise in the transition amplitudes for a heavy meson decaying into a light one via a Bethe-Salpeter approach which incorporates heavy quark symmetry. Phenomenological consequences on several semileptonic, nonleptonic and FCNC induced decays of heavy flavoured mesons are derived and discussed.
|
hep-ph/9203210
| null |
F. del Aguila, M. Martinez and M. Quiros
|
Precision bounds on $m_H$ and $m_t
|
11 pages
|
Nucl.Phys. B381 (1992) 451-466
|
10.1016/0550-3213(92)90485-T
| null |
hep-ph
| null |
We perform a fit to precise electroweak data to determine the Higgs and top
masses. Penalty functions taking into account their production limits are
included. We find ${\displaystyle m_H=65^{+245}_{-4}\ GeV}$ and ${\displaystyle
m_t=122^{+25}_{-20}\ GeV}$. However whereas the top $\chi^2$ distribution
behaves properly near the minimum, the Higgs $\chi^2$ distribution does not,
indicating a statistical fluctuation or new physics. In fact no significative
bound on the Higgs mass can be given at present. However, if the LEP accuracy
is improved and the top is discovered in the preferred range of top masses, a
meaningful bound on the Higgs mass could be obtained within the standard model
framework.
|
[
{
"created": "Sun, 15 Mar 1992 16:26:39 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"del Aguila",
"F.",
""
],
[
"Martinez",
"M.",
""
],
[
"Quiros",
"M.",
""
]
] |
We perform a fit to precise electroweak data to determine the Higgs and top masses. Penalty functions taking into account their production limits are included. We find ${\displaystyle m_H=65^{+245}_{-4}\ GeV}$ and ${\displaystyle m_t=122^{+25}_{-20}\ GeV}$. However whereas the top $\chi^2$ distribution behaves properly near the minimum, the Higgs $\chi^2$ distribution does not, indicating a statistical fluctuation or new physics. In fact no significative bound on the Higgs mass can be given at present. However, if the LEP accuracy is improved and the top is discovered in the preferred range of top masses, a meaningful bound on the Higgs mass could be obtained within the standard model framework.
|
hep-ph/0510077
|
Luca Silvestrini
|
Luca Silvestrini
|
Rare decays and CP violation beyond the Standard Model
|
Talk given at Lepton-Photon 2005
|
Int.J.Mod.Phys. A21 (2006) 1738-1749
|
10.1142/S0217751X06032721
| null |
hep-ph
| null |
We review the status of rare decays and CP violation in extensions of the
Standard Model. We analyze the determination of the unitarity triangle and the
model-independent constraints on new physics that can be derived from this
analysis. We find stringent bounds on new contributions to K-Kbar and Bd-Bdbar
mixing, pointing either to models of minimal flavour violation or to models
with new sources of flavour and CP violation in b to s transitions. We discuss
the status of the universal unitarity triangle in minimal flavour violation,
and study rare decays in this class of models. We then turn to supersymmetric
models with nontrivial mixing between second and third generation squarks,
discuss the present constraints on this mixing and analyze the possible effects
on CP violation in b to s nonleptonic decays and on Bs-Bsbar mixing. We
conclude presenting an outlook on Lepton-Photon 2009.
|
[
{
"created": "Thu, 6 Oct 2005 15:10:04 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Silvestrini",
"Luca",
""
]
] |
We review the status of rare decays and CP violation in extensions of the Standard Model. We analyze the determination of the unitarity triangle and the model-independent constraints on new physics that can be derived from this analysis. We find stringent bounds on new contributions to K-Kbar and Bd-Bdbar mixing, pointing either to models of minimal flavour violation or to models with new sources of flavour and CP violation in b to s transitions. We discuss the status of the universal unitarity triangle in minimal flavour violation, and study rare decays in this class of models. We then turn to supersymmetric models with nontrivial mixing between second and third generation squarks, discuss the present constraints on this mixing and analyze the possible effects on CP violation in b to s nonleptonic decays and on Bs-Bsbar mixing. We conclude presenting an outlook on Lepton-Photon 2009.
|
2207.04654
|
Ilkka Helenius
|
Ilkka Helenius, Marina Walt and Werner Vogelsang
|
TUJU21: nuclear PDFs with electroweak-boson data at NNLO
|
5 pages, presented at DIS2022: XXIX International Workshop on
Deep-Inelastic Scattering and Related Subjects, Santiago de Compostela,
Spain, May 2-6 2022
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Nuclear parton distribution functions (nPDFs) can be determined in a global
QCD analysis using a wide range of experimental data. In addition to older
fixed-target deep inelastic scattering and Drell-Yan (DY) dilepton production
data, several analyses from p+Pb collisions at the LHC provide further
constraints and extend the kinematic reach of applicable data. Here we present
an update of our previous TUJU19 analysis where we now include also
electroweak-boson production data recently measured by ATLAS and CMS. For the
first time, LHC data are included in a nPDF analysis performed at
next-to-next-to-leading order (NNLO) in perturbative QCD. As before, our setup
is based on the open-source analysis framework xFitter and we fit our own
proton baseline, ensuring a fully consistent setup. We find good agreement with
the applied data and that the resulting $\chi^2/N_{\mathrm{df}}$ is
significantly smaller in case of the NNLO analysis (0.84) compared to our NLO
analysis (0.94). Also, we present comparisons between our NNLO calculations and
electroweak-boson production data in Pb+Pb collisions from ATLAS and CMS and DY
data recently measured by CMS where NNLO corrections are found significant.
|
[
{
"created": "Mon, 11 Jul 2022 06:29:45 GMT",
"version": "v1"
}
] |
2022-07-12
|
[
[
"Helenius",
"Ilkka",
""
],
[
"Walt",
"Marina",
""
],
[
"Vogelsang",
"Werner",
""
]
] |
Nuclear parton distribution functions (nPDFs) can be determined in a global QCD analysis using a wide range of experimental data. In addition to older fixed-target deep inelastic scattering and Drell-Yan (DY) dilepton production data, several analyses from p+Pb collisions at the LHC provide further constraints and extend the kinematic reach of applicable data. Here we present an update of our previous TUJU19 analysis where we now include also electroweak-boson production data recently measured by ATLAS and CMS. For the first time, LHC data are included in a nPDF analysis performed at next-to-next-to-leading order (NNLO) in perturbative QCD. As before, our setup is based on the open-source analysis framework xFitter and we fit our own proton baseline, ensuring a fully consistent setup. We find good agreement with the applied data and that the resulting $\chi^2/N_{\mathrm{df}}$ is significantly smaller in case of the NNLO analysis (0.84) compared to our NLO analysis (0.94). Also, we present comparisons between our NNLO calculations and electroweak-boson production data in Pb+Pb collisions from ATLAS and CMS and DY data recently measured by CMS where NNLO corrections are found significant.
|
hep-ph/9509268
|
D. I. Melikhov
|
D. Melikhov
|
Form Factors of Meson Decays in the Relativistic Constituent Quark Model
|
Latex, 29 pages, 18 figures
|
Phys.Rev. D53 (1996) 2460-2479
|
10.1103/PhysRevD.53.2460
| null |
hep-ph
| null |
A formalism for the relativistic description of hadron decays within the
constituent quark model is presented. First, hadron amplitudes of the
light--cone constituent quark model, in particular the weak transition form
factors at spacelike momentum transfers, $q^2\le 0$, are represented in the
form of the dispersion integrals over the hadron mass. Second, the form factors
at $q^2>0$ are obtained by performing the analytic continuation from the region
$q^2<0$. As a result, the transition form factors both in the scattering and
the decay regions are expressed through the light--cone wave functions of the
initial and final hadrons. The technique is applied to the description of the
semileptonic decays of pseudoscalar mesons and direct calculation of the
transition form factors at $q^2>0$. Meson properties in the heavy quark limit
are investigated.
|
[
{
"created": "Mon, 11 Sep 1995 12:53:54 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Melikhov",
"D.",
""
]
] |
A formalism for the relativistic description of hadron decays within the constituent quark model is presented. First, hadron amplitudes of the light--cone constituent quark model, in particular the weak transition form factors at spacelike momentum transfers, $q^2\le 0$, are represented in the form of the dispersion integrals over the hadron mass. Second, the form factors at $q^2>0$ are obtained by performing the analytic continuation from the region $q^2<0$. As a result, the transition form factors both in the scattering and the decay regions are expressed through the light--cone wave functions of the initial and final hadrons. The technique is applied to the description of the semileptonic decays of pseudoscalar mesons and direct calculation of the transition form factors at $q^2>0$. Meson properties in the heavy quark limit are investigated.
|
hep-ph/0010247
|
Sonja Kabana
|
Sonja Kabana, Peter Minkowski (University of Bern, Switzerland)
|
Mapping out the QCD phase transition in multiparticle production
|
52 pages, 8 figures
|
NewJ.Phys.3:4,2001
|
10.1088/1367-2630/3/1/304
|
University of Bern preprints BUHE-00-09, BUTP-2000/26
|
hep-ph
| null |
We analyze multiparticle production in a thermal framework for 7 central
nucleus nucleus collisions, $e^+$+ $e^-$ annihilation into hadrons on the Z
resonance and 4 hadronic reactions (p+p and p+$\bar{p}$ with partial centrality
selec tion), with center of mass energies ranging from $\sqrt{s}$= 2.6 GeV (per
nucleon pair) to 1.8 TeV. Thermodynamic parameters at chemical freeze-out
(temperature and baryon and strangeness fugacities) are obtained from
appropriate fits, generally improving in quality for reactions subjected to
centrality cuts. All systems with nonvanishing fugacities are extrapolated
along trajectories of equal energy density, density and entropy density to zero
fugacities. The so obtained temperatures extrapolated to zero fugacities as a
function of initial energy density $\epsilon_{in}$ universally show a strong
rise followed by a saturating limit of $T_{lim}$ = 155 $\pm$ 6 $\pm$ 20 MeV. We
interpret this behaviour as mapping out the boundary between quark gluon plasma
and hadronic phases. The ratio of strange antiquarks to light ones as a
function of the initial energy density $\epsilon_{in}$ shows the same behaviour
as the temperature, saturating at a value of 0.365 $\pm$ 0.033 $\pm$ 0.07. No
distinctive feature of 'strangeness enhancement' is seen for heavy ion
collisions relative to hadronic and leptonic reactions, when compared at the
same initial energy density.
|
[
{
"created": "Fri, 20 Oct 2000 23:44:02 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Kabana",
"Sonja",
"",
"University of Bern, Switzerland"
],
[
"Minkowski",
"Peter",
"",
"University of Bern, Switzerland"
]
] |
We analyze multiparticle production in a thermal framework for 7 central nucleus nucleus collisions, $e^+$+ $e^-$ annihilation into hadrons on the Z resonance and 4 hadronic reactions (p+p and p+$\bar{p}$ with partial centrality selec tion), with center of mass energies ranging from $\sqrt{s}$= 2.6 GeV (per nucleon pair) to 1.8 TeV. Thermodynamic parameters at chemical freeze-out (temperature and baryon and strangeness fugacities) are obtained from appropriate fits, generally improving in quality for reactions subjected to centrality cuts. All systems with nonvanishing fugacities are extrapolated along trajectories of equal energy density, density and entropy density to zero fugacities. The so obtained temperatures extrapolated to zero fugacities as a function of initial energy density $\epsilon_{in}$ universally show a strong rise followed by a saturating limit of $T_{lim}$ = 155 $\pm$ 6 $\pm$ 20 MeV. We interpret this behaviour as mapping out the boundary between quark gluon plasma and hadronic phases. The ratio of strange antiquarks to light ones as a function of the initial energy density $\epsilon_{in}$ shows the same behaviour as the temperature, saturating at a value of 0.365 $\pm$ 0.033 $\pm$ 0.07. No distinctive feature of 'strangeness enhancement' is seen for heavy ion collisions relative to hadronic and leptonic reactions, when compared at the same initial energy density.
|
1407.1320
|
Andreas Crivellin
|
Andreas Crivellin and Stefan Pokorski
|
Can the differences in the determinations of $V_{ub}$ and $V_{cb}$ be
explained by New Physics?
|
6 pages, 2 figures, version accepted for publication in PRL
|
Phys. Rev. Lett. 114, 011802 (2015)
|
10.1103/PhysRevLett.114.011802
|
CERN-PH-TH-2014-124
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The precise determination of the CKM elements $V_{cb}$ and $V_{ub}$ is
crucial for any new physics analysis in the flavour sector. Their values can be
determined from several tree-level decays: $V_{cb}$ can be extracted from $B\to
D\ell\nu$ and $B\to D^*\ell\nu$ while $V_{ub}$ can be obtained from $B\to
\pi\ell\nu$, $B\to \rho\ell\nu$ and $B\to\tau\nu$. In addition, for both $V_{cb
}$ and $V_{ub}$ an inclusive determination is available. There is a long
lasting discrepancy between the inclusive and exclusive determinations which
recently even increased for $V_{cb}$ above the $3\;\sigma$ level. In this
article we study the possible effect of new physics on the inclusive and
exclusive determination of $V_{cb}$ and $V_{ub}$ in a model independent way. We
find that there is only one operator corresponding to a modified $W$ coupling
which can achieve this. However, respecting $SU(2)$ gauge invariance at the
high scale this would lead to very large violations of the $Z$ to $b\bar b$
coupling not compatible with experiment. Therefore, we conclude that a new
physics explanation of the difference between the inclusive and exclusive
determination of $V_{cb}$ and $V_{ub}$ is currently ruled out. Therefore, the
discrepancies must be due underestimated uncertainties in the theoretical
and/or the experimental analysis.
|
[
{
"created": "Fri, 4 Jul 2014 20:00:16 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Dec 2014 16:58:17 GMT",
"version": "v2"
}
] |
2015-01-14
|
[
[
"Crivellin",
"Andreas",
""
],
[
"Pokorski",
"Stefan",
""
]
] |
The precise determination of the CKM elements $V_{cb}$ and $V_{ub}$ is crucial for any new physics analysis in the flavour sector. Their values can be determined from several tree-level decays: $V_{cb}$ can be extracted from $B\to D\ell\nu$ and $B\to D^*\ell\nu$ while $V_{ub}$ can be obtained from $B\to \pi\ell\nu$, $B\to \rho\ell\nu$ and $B\to\tau\nu$. In addition, for both $V_{cb }$ and $V_{ub}$ an inclusive determination is available. There is a long lasting discrepancy between the inclusive and exclusive determinations which recently even increased for $V_{cb}$ above the $3\;\sigma$ level. In this article we study the possible effect of new physics on the inclusive and exclusive determination of $V_{cb}$ and $V_{ub}$ in a model independent way. We find that there is only one operator corresponding to a modified $W$ coupling which can achieve this. However, respecting $SU(2)$ gauge invariance at the high scale this would lead to very large violations of the $Z$ to $b\bar b$ coupling not compatible with experiment. Therefore, we conclude that a new physics explanation of the difference between the inclusive and exclusive determination of $V_{cb}$ and $V_{ub}$ is currently ruled out. Therefore, the discrepancies must be due underestimated uncertainties in the theoretical and/or the experimental analysis.
|
hep-ph/9803257
|
Michael Spira
|
Michael Spira, Peter M.Zerwas
|
Electroweak Symmetry Breaking and Higgs Physics
|
70 pages, latex, 30 figures
|
Lect.Notes Phys.512:161-225,1998
|
10.1007/BFb0106895
|
CERN-TH/97-379, DESY 97-261
|
hep-ph hep-ex
| null |
An introduction to electroweak symmetry breaking and Higgs physics is
presented for the Standard Model and its supersymmetric extensions. A brief
overview will also be given on strong interactions of the electroweak gauge
bosons in alternative scenarios. In addition to the theoretical basis, the
present experimental status of Higgs physics and implications for future
experiments at the LHC and $e^+e^-$ linear colliders are discussed.
|
[
{
"created": "Thu, 5 Mar 1998 19:54:26 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Mar 1998 09:37:20 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Spira",
"Michael",
""
],
[
"Zerwas",
"Peter M.",
""
]
] |
An introduction to electroweak symmetry breaking and Higgs physics is presented for the Standard Model and its supersymmetric extensions. A brief overview will also be given on strong interactions of the electroweak gauge bosons in alternative scenarios. In addition to the theoretical basis, the present experimental status of Higgs physics and implications for future experiments at the LHC and $e^+e^-$ linear colliders are discussed.
|
1301.2761
|
Xiao-Ming Xu
|
Xiao-Ming Xu
|
Early thermalization of quark-gluon matter by elastic 3-to-3 scattering
|
5 pages, 1 figure, proceedings for Extreme QCD 2012
|
J. Phys. Conf. Ser. 432 (2013) 012009
|
10.1088/1742-6596/432/1/012009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The early thermalization is crucial to the quark-gluon plasma as a perfect
liquid and results from many-body scattering. We calculate squared amplitudes
for elastic parton-parton-parton scattering in perturbative QCD. Transport
equations with the squared amplitudes are established and solved to obtain the
thermalization time of initially produced quark-gluon matter and the initial
temperature of quark-gluon plasma. We find that the thermalization times of
quark matter and gluon matter are different.
|
[
{
"created": "Sun, 13 Jan 2013 10:38:14 GMT",
"version": "v1"
}
] |
2013-05-13
|
[
[
"Xu",
"Xiao-Ming",
""
]
] |
The early thermalization is crucial to the quark-gluon plasma as a perfect liquid and results from many-body scattering. We calculate squared amplitudes for elastic parton-parton-parton scattering in perturbative QCD. Transport equations with the squared amplitudes are established and solved to obtain the thermalization time of initially produced quark-gluon matter and the initial temperature of quark-gluon plasma. We find that the thermalization times of quark matter and gluon matter are different.
|
1709.04439
|
Dremin
|
I.M. Dremin, V.A. Nechitailo, S.N. White
|
Central and peripheral interactions of hadrons
|
18 pages, 5 Figures; published EPJ C
https://doi.org/10.1140/epjc/s10052-017-5483-4
| null |
10.1140/epjc/s10052-017-5483-4
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Surprisingly enough, the ratio of elastic to inelastic cross sections of
proton interactions increases with energy in the interval correspond- ing to
ISR - LHC (i.e. from 10 GeV to 10 TeV). That leads to special features of their
spatial interaction region at these and higher ener- gies. Within the framework
of some phenomenological models, we show how the particular ranges of the
transferred momenta measured in elastic scattering experiments expose the
spatial features of the in- elastic interaction region according to the
unitarity condition. The difference between their predictions at higher
energies is discussed. The notion of central and peripheral collisions of
hadrons is treated in terms of the impact parameters description. It is shown
that the shape of the differential cross section in the diffraction cone is
mostly determined by collisions with intermediate impact parameters. Elastic
scattering at very small transferred momenta is sensitive to peripheral
processes with large impact parameters. The role of central collisions in
formation of the diffraction cone is less significant.
|
[
{
"created": "Wed, 13 Sep 2017 17:34:23 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Dec 2017 12:59:07 GMT",
"version": "v2"
}
] |
2017-12-29
|
[
[
"Dremin",
"I. M.",
""
],
[
"Nechitailo",
"V. A.",
""
],
[
"White",
"S. N.",
""
]
] |
Surprisingly enough, the ratio of elastic to inelastic cross sections of proton interactions increases with energy in the interval correspond- ing to ISR - LHC (i.e. from 10 GeV to 10 TeV). That leads to special features of their spatial interaction region at these and higher ener- gies. Within the framework of some phenomenological models, we show how the particular ranges of the transferred momenta measured in elastic scattering experiments expose the spatial features of the in- elastic interaction region according to the unitarity condition. The difference between their predictions at higher energies is discussed. The notion of central and peripheral collisions of hadrons is treated in terms of the impact parameters description. It is shown that the shape of the differential cross section in the diffraction cone is mostly determined by collisions with intermediate impact parameters. Elastic scattering at very small transferred momenta is sensitive to peripheral processes with large impact parameters. The role of central collisions in formation of the diffraction cone is less significant.
|
0806.0610
|
Charles Gale
|
Charles Gale, Simon Turbide, Evan Frodermann, Ulrich Heinz
|
Photons from nuclear collisions at RHIC energies
|
4 pages, talk given at Quark Matter 2008, Feb. 4-10, 2008, Jaipur,
India
|
J.Phys.G35:104119,2008
|
10.1088/0954-3899/35/10/104119
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We model the hot and dense strongly interacting mater produced in high energy
heavy ion collisions using relativistic hydrodynamics. Several different
sources of real photons produced during these collisions are considered and
their relative importance is assessed. We include contributions from QCD jets,
which are allowed to loose and gain energy as they proceed through the hot
matter. This is treated within the AMY formalism. We obtain photon spectra,
R_{AA}, and v_2 in agreement with measurements performed by the PHENIX
collaboration.
|
[
{
"created": "Tue, 3 Jun 2008 19:06:56 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Gale",
"Charles",
""
],
[
"Turbide",
"Simon",
""
],
[
"Frodermann",
"Evan",
""
],
[
"Heinz",
"Ulrich",
""
]
] |
We model the hot and dense strongly interacting mater produced in high energy heavy ion collisions using relativistic hydrodynamics. Several different sources of real photons produced during these collisions are considered and their relative importance is assessed. We include contributions from QCD jets, which are allowed to loose and gain energy as they proceed through the hot matter. This is treated within the AMY formalism. We obtain photon spectra, R_{AA}, and v_2 in agreement with measurements performed by the PHENIX collaboration.
|
hep-ph/9706554
|
Markus Luty
|
Markus A. Luty
|
Simple Gauge-mediated Models with Local Minima
|
8 pages, LaTeX2e, no figures. Clarifications and references added;
results unaffected
|
Phys.Lett. B414 (1997) 71-76
|
10.1016/S0370-2693(97)01104-0
|
UMD-PP 97-132
|
hep-ph
| null |
We describe a simple class of supersymmetric gauge theories that can act as
supersymmetry-breaking sectors for gauge-mediated supersymmetry breaking. The
models have a local supersymmetry-breaking minimum along a direction in field
space where a singlet gets a large expectation value. The potential along this
direction has a runaway behavior stabilized by supersymmetry breaking in the
effective low-energy theory. The supersymmetric vacua are at infinite field
values, and cosmological bounds on false vacuum decay are easily satisfied. The
models have no dimensionful parameters, and all mass scales arise through
strong coupling dynamics. Simple variants of the model are compatible with
perturbative unification, can naturally have dynamical supersymmetry breaking
at a scale as low as 10 TeV, and can solve the R axion problem without
appealing to Planck-scale effects.
|
[
{
"created": "Mon, 30 Jun 1997 19:58:17 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 1997 20:05:20 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jul 1997 15:10:32 GMT",
"version": "v3"
}
] |
2009-10-30
|
[
[
"Luty",
"Markus A.",
""
]
] |
We describe a simple class of supersymmetric gauge theories that can act as supersymmetry-breaking sectors for gauge-mediated supersymmetry breaking. The models have a local supersymmetry-breaking minimum along a direction in field space where a singlet gets a large expectation value. The potential along this direction has a runaway behavior stabilized by supersymmetry breaking in the effective low-energy theory. The supersymmetric vacua are at infinite field values, and cosmological bounds on false vacuum decay are easily satisfied. The models have no dimensionful parameters, and all mass scales arise through strong coupling dynamics. Simple variants of the model are compatible with perturbative unification, can naturally have dynamical supersymmetry breaking at a scale as low as 10 TeV, and can solve the R axion problem without appealing to Planck-scale effects.
|
hep-ph/0106146
|
S. weinzierl
|
Stefan Weinzierl
|
A general algorithm to generate unweighted events for next-to-leading
order calculations in electron-positron annihilation
|
19 pages, published version
|
JHEP 0108 (2001) 028
|
10.1088/1126-6708/2001/08/028
| null |
hep-ph
| null |
Given a next-to-leading order calculation, we show how to set up a computer
program, which generates a sequence of unweighted momentum configurations, each
configuration containing either n or n+1 four-vectors, such that for any
infrared safe observable the average over these configurations coincides with
the NLO calculation up to errors of order y_res. The core of the algorithm is a
method to combine real emission and virtual corrections on a point-by-point
basis in hard phase space. The algorithm can be implemented on top of existing
NLO calculations.
|
[
{
"created": "Thu, 14 Jun 2001 10:01:26 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2001 15:50:19 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Weinzierl",
"Stefan",
""
]
] |
Given a next-to-leading order calculation, we show how to set up a computer program, which generates a sequence of unweighted momentum configurations, each configuration containing either n or n+1 four-vectors, such that for any infrared safe observable the average over these configurations coincides with the NLO calculation up to errors of order y_res. The core of the algorithm is a method to combine real emission and virtual corrections on a point-by-point basis in hard phase space. The algorithm can be implemented on top of existing NLO calculations.
|
1812.08484
|
Peiwen Wu
|
Tae Jeong Kim, Pyungwon Ko, Jinmian Li, Jiwon Park, Peiwen Wu
|
Correlation between $R_{D^{(*)}}$ and top quark FCNC decays in
leptoquark models
|
version matching the JHEP publication
| null |
10.1007/JHEP07(2019)025
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Some interpretations of $R_{D^{(*)}}$ anomaly in $B$ meson decay using
leptoquark (LQ) models can also generate top quark decays through Flavor
Changing Neutral Current (FCNC). In this work we focus on two LQs, i.e. scalar
$S_1$ and vector $U_1$ which are both singlet under the $SU(2)_L$ gauge group
in the Standard Model (SM). We investigate their implications on the 3-body top
FCNC decays $t\to c \ell_i \ell_j$ at tree level and the 2-body $t\to c V$ at
one-loop level, with $\ell$ being the SM leptons and $V=\gamma, Z, g$ being the
SM gauge bosons. We utilize the $2\sigma$ parameter fitting ranges of the LQ
models and find that $Br(t\to c \ell_i \ell_j)$ at tree level can reach
$\mathcal{O}(10^{-6})$ and $Br(t\to c V)$ at one-loop level can reach
$\mathcal{O}(10^{-10})$. Some quick collider search prospects are also
analyzed.
|
[
{
"created": "Thu, 20 Dec 2018 11:12:54 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Dec 2018 09:47:59 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Jan 2019 15:11:18 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Jun 2019 04:49:45 GMT",
"version": "v4"
},
{
"created": "Tue, 9 Jul 2019 07:25:08 GMT",
"version": "v5"
}
] |
2020-01-08
|
[
[
"Kim",
"Tae Jeong",
""
],
[
"Ko",
"Pyungwon",
""
],
[
"Li",
"Jinmian",
""
],
[
"Park",
"Jiwon",
""
],
[
"Wu",
"Peiwen",
""
]
] |
Some interpretations of $R_{D^{(*)}}$ anomaly in $B$ meson decay using leptoquark (LQ) models can also generate top quark decays through Flavor Changing Neutral Current (FCNC). In this work we focus on two LQs, i.e. scalar $S_1$ and vector $U_1$ which are both singlet under the $SU(2)_L$ gauge group in the Standard Model (SM). We investigate their implications on the 3-body top FCNC decays $t\to c \ell_i \ell_j$ at tree level and the 2-body $t\to c V$ at one-loop level, with $\ell$ being the SM leptons and $V=\gamma, Z, g$ being the SM gauge bosons. We utilize the $2\sigma$ parameter fitting ranges of the LQ models and find that $Br(t\to c \ell_i \ell_j)$ at tree level can reach $\mathcal{O}(10^{-6})$ and $Br(t\to c V)$ at one-loop level can reach $\mathcal{O}(10^{-10})$. Some quick collider search prospects are also analyzed.
|
2306.14778
|
Vittorio D'Esposito
|
Vittorio D'Esposito, Giulia Gubitosi
|
Constraints on quantum spacetime-induced decoherence from neutrino
oscillations
|
18 pages, 4 figures; v3 matches the version accepted for publication
in PRD
| null | null | null |
hep-ph gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the implications of decoherence induced by quantum spacetime
properties on neutrino oscillation phenomena. We develop a general formalism
where the evolution of neutrinos is governed by a Lindblad-type equation and we
compute the oscillation damping factor for various models that have been
proposed in the literature. Furthermore, we discuss the sensitivity to these
effects of different types of neutrino oscillation experiments, encompassing
astrophysical, atmospheric, solar, and reactor neutrino experiments. By using
neutrino oscillation data from long-baseline reactors and atmospheric neutrino
observations, we establish stringent constraints on the energy scale governing
the strength of the decoherence induced by stochastic metric fluctuations,
amounting to, respectively, $E_{QG}\geq 2.6 \cdot 10^{34}\; \text{GeV}$ and
$E_{QG}\geq 2.5\cdot 10^{55}\;\text{GeV}$.
|
[
{
"created": "Mon, 26 Jun 2023 15:38:56 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2024 15:17:05 GMT",
"version": "v2"
},
{
"created": "Tue, 21 May 2024 13:26:26 GMT",
"version": "v3"
}
] |
2024-05-22
|
[
[
"D'Esposito",
"Vittorio",
""
],
[
"Gubitosi",
"Giulia",
""
]
] |
We investigate the implications of decoherence induced by quantum spacetime properties on neutrino oscillation phenomena. We develop a general formalism where the evolution of neutrinos is governed by a Lindblad-type equation and we compute the oscillation damping factor for various models that have been proposed in the literature. Furthermore, we discuss the sensitivity to these effects of different types of neutrino oscillation experiments, encompassing astrophysical, atmospheric, solar, and reactor neutrino experiments. By using neutrino oscillation data from long-baseline reactors and atmospheric neutrino observations, we establish stringent constraints on the energy scale governing the strength of the decoherence induced by stochastic metric fluctuations, amounting to, respectively, $E_{QG}\geq 2.6 \cdot 10^{34}\; \text{GeV}$ and $E_{QG}\geq 2.5\cdot 10^{55}\;\text{GeV}$.
|
2404.10815
|
Carlos Henrique de Lima
|
Carlos Henrique de Lima and Daniel Stolarski
|
Influence of new states in searches for negative gauge-Higgs couplings
|
14 pages, 8 figures. Extended dicussion, conclusions unchanged
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we explore how constraints based on interference effects for
the negative gauge-Higgs coupling scenario are affected by new physics. Models
that achieve this wrong-sign gauge-Higgs coupling inevitably have new charged
Higgs states. These states affect the interpretation of interference effects.
We recast the ATLAS analysis for VBF $Wh$, showing that the previously excluded
negative gauge-Higgs coupling scenario is still experimentally viable for
charged Higgs masses below $370$~GeV. We show that it is possible to weaken
this bound further with mild tuning in the parameter space. We discuss how to
further constrain the wrong-sign gauge-Higgs coupling hypothesis and point out
the potential of VBF $Zh$ to exclude this scenario in a model-independent way.
|
[
{
"created": "Tue, 16 Apr 2024 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2024 21:17:59 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Jul 2024 17:17:53 GMT",
"version": "v3"
}
] |
2024-07-16
|
[
[
"de Lima",
"Carlos Henrique",
""
],
[
"Stolarski",
"Daniel",
""
]
] |
In this work, we explore how constraints based on interference effects for the negative gauge-Higgs coupling scenario are affected by new physics. Models that achieve this wrong-sign gauge-Higgs coupling inevitably have new charged Higgs states. These states affect the interpretation of interference effects. We recast the ATLAS analysis for VBF $Wh$, showing that the previously excluded negative gauge-Higgs coupling scenario is still experimentally viable for charged Higgs masses below $370$~GeV. We show that it is possible to weaken this bound further with mild tuning in the parameter space. We discuss how to further constrain the wrong-sign gauge-Higgs coupling hypothesis and point out the potential of VBF $Zh$ to exclude this scenario in a model-independent way.
|
hep-ph/0508122
|
Khamidbi Beshtoev Mukhamedovich
|
Kh. M. Beshtoev
|
Expressions for Neutrino Wave Functions and Transition Probabilities at
Three Neutrino Oscillations in Vacuum and Some of Their Applications
|
13 pages, no figures
| null | null | null |
hep-ph
| null |
We have considered three neutrino transitions and oscillations in the general
case and obtained expressions for neutrino wave functions in three cases: with
CP violation, without CP violations and the case when $\nu_e \leftrightarrow
\nu_\tau$ transitions are absent (some works indicate on this possibility).
Then using the existing experimental data some analysis has been fulfilled.
This analysis definitely has shown that transitions $\nu_e \leftrightarrow
\nu_\tau$ cannot be closed for the Solar neutrinos. However, this possibility
may be realized by using the mechanism of resonance enhancement neutrino
oscillations in matter (the Sun). But this possibility is not confirmed by the
Solar neutrinos spectrum (the Solar neutrinos spectrum is not distorted) and
the Day-Night effect (this effect is not observed). It was found out that the
probability of $\nu_e \leftrightarrow \nu_e$ neutrino transitions is positive
defined value only if the angle of $\nu_e, \nu_\tau$ mixing $\beta \le 15^o
\div 17^o$.
|
[
{
"created": "Wed, 10 Aug 2005 17:37:52 GMT",
"version": "v1"
}
] |
2009-01-01
|
[
[
"Beshtoev",
"Kh. M.",
""
]
] |
We have considered three neutrino transitions and oscillations in the general case and obtained expressions for neutrino wave functions in three cases: with CP violation, without CP violations and the case when $\nu_e \leftrightarrow \nu_\tau$ transitions are absent (some works indicate on this possibility). Then using the existing experimental data some analysis has been fulfilled. This analysis definitely has shown that transitions $\nu_e \leftrightarrow \nu_\tau$ cannot be closed for the Solar neutrinos. However, this possibility may be realized by using the mechanism of resonance enhancement neutrino oscillations in matter (the Sun). But this possibility is not confirmed by the Solar neutrinos spectrum (the Solar neutrinos spectrum is not distorted) and the Day-Night effect (this effect is not observed). It was found out that the probability of $\nu_e \leftrightarrow \nu_e$ neutrino transitions is positive defined value only if the angle of $\nu_e, \nu_\tau$ mixing $\beta \le 15^o \div 17^o$.
|
2312.16091
|
Takashi Hiramatsu
|
Takashi Hiramatsu, Marc Lilley and Daisuke Yamauchi
|
Dynamical simulations of colliding superconducting strings
|
24 pages, 18 figures, 2 tables; accepted version in JCAP
|
Journal of Cosmology and Astroparticle Physics, 06, 030 (2024)
|
10.1088/1475-7516/2024/06/030
|
RUP-23-28
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the collisions of elastic superconducting strings, also referred to
as current-carrying strings, formed in a $U_{\rm local}(1) \times U_{\rm
global}(1)$ field-theory model, using three-dimensional numerical
field-theoretic simulations. The breaking of $U_{\rm local}(1)$ leads to string
formation via the Higgs mechanism, while the scalar field of the second $U_{\rm
global}(1)$ carries the current, which condenses onto the string. We construct
straight and static superconducting string solutions numerically and identify
the regions in which they exist in the model parameter space. We then perform
dynamical simulations for colliding superconducting strings with various
collision angles and collision velocities. We explore the kinematic parameter
space for six sets of model parameters characterising the coupling between the
two scalar fields and the current on the string. The final states of the
strings (after the collision) are reported diagrammatically. We classify them
into four categories: (i) regular intercommutation, (ii) double
intercommutation, (iii) bound state, and (iv) expanding string solution. We
find that the outcome of the collision process is the regular intercommutation
of the colliding strings in most of the kinematic parameter space while they
form bound states for small velocities and small angles. We also find that the
strings undergo two successive intercommutations and, therefore, pass through
one other in a small region corresponding to relatively small angles and
velocities of order c/2. The string structure breaks down when there is a
relatively large coupling between the two scalar fields, even if each string is
stable before the occurrence of the collision.
|
[
{
"created": "Tue, 26 Dec 2023 15:29:34 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2024 08:58:22 GMT",
"version": "v2"
}
] |
2024-06-24
|
[
[
"Hiramatsu",
"Takashi",
""
],
[
"Lilley",
"Marc",
""
],
[
"Yamauchi",
"Daisuke",
""
]
] |
We study the collisions of elastic superconducting strings, also referred to as current-carrying strings, formed in a $U_{\rm local}(1) \times U_{\rm global}(1)$ field-theory model, using three-dimensional numerical field-theoretic simulations. The breaking of $U_{\rm local}(1)$ leads to string formation via the Higgs mechanism, while the scalar field of the second $U_{\rm global}(1)$ carries the current, which condenses onto the string. We construct straight and static superconducting string solutions numerically and identify the regions in which they exist in the model parameter space. We then perform dynamical simulations for colliding superconducting strings with various collision angles and collision velocities. We explore the kinematic parameter space for six sets of model parameters characterising the coupling between the two scalar fields and the current on the string. The final states of the strings (after the collision) are reported diagrammatically. We classify them into four categories: (i) regular intercommutation, (ii) double intercommutation, (iii) bound state, and (iv) expanding string solution. We find that the outcome of the collision process is the regular intercommutation of the colliding strings in most of the kinematic parameter space while they form bound states for small velocities and small angles. We also find that the strings undergo two successive intercommutations and, therefore, pass through one other in a small region corresponding to relatively small angles and velocities of order c/2. The string structure breaks down when there is a relatively large coupling between the two scalar fields, even if each string is stable before the occurrence of the collision.
|
1510.02458
|
Ashutosh V. Kotwal
|
A. V. Kotwal and B. Jayatilaka
|
Comparison of Horace and Photos Algorithms for Multi-Photon Emission in
the Context of the W Boson Mass Measurement
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The W boson mass measurement is sensitive to QED radiative corrections due to
virtual photon loops and real photon emission. The largest shift in the
measured mass, which depends on the transverse momentum spectrum of the charged
lepton from the boson decay, is caused by the emission of real photons from the
final-state lepton. There are a number of calculations and codes available to
model the final-state photon emission. We perform a detailed study, comparing
the results from the Horace and Photos implementations of the final-state
multi-photon emission in the context of a direct measurement of the W boson
mass at the Tevatron. Mass fits are performed using a simulation of the CDF II
detector.
|
[
{
"created": "Thu, 8 Oct 2015 19:49:51 GMT",
"version": "v1"
}
] |
2015-10-09
|
[
[
"Kotwal",
"A. V.",
""
],
[
"Jayatilaka",
"B.",
""
]
] |
The W boson mass measurement is sensitive to QED radiative corrections due to virtual photon loops and real photon emission. The largest shift in the measured mass, which depends on the transverse momentum spectrum of the charged lepton from the boson decay, is caused by the emission of real photons from the final-state lepton. There are a number of calculations and codes available to model the final-state photon emission. We perform a detailed study, comparing the results from the Horace and Photos implementations of the final-state multi-photon emission in the context of a direct measurement of the W boson mass at the Tevatron. Mass fits are performed using a simulation of the CDF II detector.
|
hep-ph/9906389
|
B. J. Nauta
|
B. J. Nauta
|
Counterterms for Linear Divergences in Real-Time Classical Gauge
Theories at High Temperature
|
10 pages, major changes
|
Nucl.Phys. B575 (2000) 383-396
|
10.1016/S0550-3213(00)00080-8
|
ITFA-99-13
|
hep-ph
| null |
Real-time classical SU($N$) gauge theories at non-zero temperature contain
linear divergences. We introduce counterterms for these divergences in the
equations of motion in the continuum and on the lattice. These counterterms can
be given in terms of auxiliary fields that satisfy local equations of motion.
We present a lattice model with 6+1D auxiliary fields that for IR-sensitive
quantities yields cut-off independent results to leading order in the coupling.
Also an approximation with 5+1D auxiliary fields is discussed.
|
[
{
"created": "Wed, 16 Jun 1999 11:40:29 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jul 1999 16:03:13 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Oct 1999 15:24:43 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Nauta",
"B. J.",
""
]
] |
Real-time classical SU($N$) gauge theories at non-zero temperature contain linear divergences. We introduce counterterms for these divergences in the equations of motion in the continuum and on the lattice. These counterterms can be given in terms of auxiliary fields that satisfy local equations of motion. We present a lattice model with 6+1D auxiliary fields that for IR-sensitive quantities yields cut-off independent results to leading order in the coupling. Also an approximation with 5+1D auxiliary fields is discussed.
|
1503.07471
|
Luca Stanco
|
A. Anokhina, A. Bagulya, M. Benettoni, P. Bernardini, R. Brugnera, M.
Calabrese, A. Cecchetti, S. Cecchini, M. Chernyavskiy, F. Dal Corso, O.
Dalkarov, A. Del Prete, G. De Robertis, M. De Serio, D. Di Ferdinando, S.
Dusini, T. Dzhatdoev, R. A. Fini, G. Fiore, A. Garfagnini, M. Guerzoni, B.
Klicek, U. Kose, K. Jakovcic, G. Laurenti, I. Lippi, F. Loddo, A. Longhin, M.
Malenica, G. Mancarella, G. Mandrioli, A. Margiotta, G. Marsell, N. Mauri, E.
Medinaceli, R. Mingazheva, O. Morgunova, M. T. Muciaccia, M. Nessi, D.
Orecchini, A. Paoloni, G. Papadia, L. Paparella, L. Pasqualini, A. Pastore,
L. Patrizii, N. Polukhina, M. Pozzato, M. Roda, T. Roganova, G. Rosa, Z.
Sahnoun, T. Shchedrina, S. Simone, C. Sirignano, G. Sirri, M. Spurio, L.
Stanco, N. Starkov, M. Stipcevic, A. Surdo, M. Tenti, V. Togo and M.
Vladymyrov
|
Search for Sterile Neutrinos in the Muon Neutrino Disappearance Mode at
FNAL
|
19 pages, published in EPJC
|
Eur. Phys. J. C (2017) 77:23
|
10.1140/epjc/s10052-016-4569-8
| null |
hep-ph hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The NESSiE Collaboration has been setup to undertake a conclusive experiment
to clarify the {\em muon--neutrino disappearance} measurements at short
baselines in order to put severe constraints to models with more than the
three--standard neutrinos. To this aim the current FNAL--Booster neutrino beam
for a Short--Baseline experiment was carefully evaluated by considering the use
of magnetic spectrometers at two sites, near and far ones. The detector
locations were studied, together with the achievable performances of two
OPERA--like spectrometers. The study was constrained by the availability of
existing hardware and a time--schedule compatible with the undergoing project
of multi--site Liquid--Argon detectors at FNAL.
The settled physics case and the kind of proposed experiment on the Booster
neutrino beam would definitively clarify the existing tension between the
$\nu_{\mu}$ disappearance and the $\nu_e$ appearance/disappearance at the eV
mass scale. In the context of neutrino oscillations the measurement of
$\nu_{\mu}$ disappearance is a robust and fast approach to either reject or
discover new neutrino states at the eV mass scale. We discuss an experimental
program able to extend by more than one order of magnitude (for neutrino
disappearance) and by almost one order of magnitude (for antineutrino
disappearance) the present range of sensitivity for the mixing angle between
standard and sterile neutrinos. These extensions are larger than those achieved
in any other proposal presented so far.
|
[
{
"created": "Wed, 25 Mar 2015 17:48:18 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2015 12:45:04 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Feb 2017 15:09:46 GMT",
"version": "v3"
}
] |
2017-02-03
|
[
[
"Anokhina",
"A.",
""
],
[
"Bagulya",
"A.",
""
],
[
"Benettoni",
"M.",
""
],
[
"Bernardini",
"P.",
""
],
[
"Brugnera",
"R.",
""
],
[
"Calabrese",
"M.",
""
],
[
"Cecchetti",
"A.",
""
],
[
"Cecchini",
"S.",
""
],
[
"Chernyavskiy",
"M.",
""
],
[
"Corso",
"F. Dal",
""
],
[
"Dalkarov",
"O.",
""
],
[
"Del Prete",
"A.",
""
],
[
"De Robertis",
"G.",
""
],
[
"De Serio",
"M.",
""
],
[
"Di Ferdinando",
"D.",
""
],
[
"Dusini",
"S.",
""
],
[
"Dzhatdoev",
"T.",
""
],
[
"Fini",
"R. A.",
""
],
[
"Fiore",
"G.",
""
],
[
"Garfagnini",
"A.",
""
],
[
"Guerzoni",
"M.",
""
],
[
"Klicek",
"B.",
""
],
[
"Kose",
"U.",
""
],
[
"Jakovcic",
"K.",
""
],
[
"Laurenti",
"G.",
""
],
[
"Lippi",
"I.",
""
],
[
"Loddo",
"F.",
""
],
[
"Longhin",
"A.",
""
],
[
"Malenica",
"M.",
""
],
[
"Mancarella",
"G.",
""
],
[
"Mandrioli",
"G.",
""
],
[
"Margiotta",
"A.",
""
],
[
"Marsell",
"G.",
""
],
[
"Mauri",
"N.",
""
],
[
"Medinaceli",
"E.",
""
],
[
"Mingazheva",
"R.",
""
],
[
"Morgunova",
"O.",
""
],
[
"Muciaccia",
"M. T.",
""
],
[
"Nessi",
"M.",
""
],
[
"Orecchini",
"D.",
""
],
[
"Paoloni",
"A.",
""
],
[
"Papadia",
"G.",
""
],
[
"Paparella",
"L.",
""
],
[
"Pasqualini",
"L.",
""
],
[
"Pastore",
"A.",
""
],
[
"Patrizii",
"L.",
""
],
[
"Polukhina",
"N.",
""
],
[
"Pozzato",
"M.",
""
],
[
"Roda",
"M.",
""
],
[
"Roganova",
"T.",
""
],
[
"Rosa",
"G.",
""
],
[
"Sahnoun",
"Z.",
""
],
[
"Shchedrina",
"T.",
""
],
[
"Simone",
"S.",
""
],
[
"Sirignano",
"C.",
""
],
[
"Sirri",
"G.",
""
],
[
"Spurio",
"M.",
""
],
[
"Stanco",
"L.",
""
],
[
"Starkov",
"N.",
""
],
[
"Stipcevic",
"M.",
""
],
[
"Surdo",
"A.",
""
],
[
"Tenti",
"M.",
""
],
[
"Togo",
"V.",
""
],
[
"Vladymyrov",
"M.",
""
]
] |
The NESSiE Collaboration has been setup to undertake a conclusive experiment to clarify the {\em muon--neutrino disappearance} measurements at short baselines in order to put severe constraints to models with more than the three--standard neutrinos. To this aim the current FNAL--Booster neutrino beam for a Short--Baseline experiment was carefully evaluated by considering the use of magnetic spectrometers at two sites, near and far ones. The detector locations were studied, together with the achievable performances of two OPERA--like spectrometers. The study was constrained by the availability of existing hardware and a time--schedule compatible with the undergoing project of multi--site Liquid--Argon detectors at FNAL. The settled physics case and the kind of proposed experiment on the Booster neutrino beam would definitively clarify the existing tension between the $\nu_{\mu}$ disappearance and the $\nu_e$ appearance/disappearance at the eV mass scale. In the context of neutrino oscillations the measurement of $\nu_{\mu}$ disappearance is a robust and fast approach to either reject or discover new neutrino states at the eV mass scale. We discuss an experimental program able to extend by more than one order of magnitude (for neutrino disappearance) and by almost one order of magnitude (for antineutrino disappearance) the present range of sensitivity for the mixing angle between standard and sterile neutrinos. These extensions are larger than those achieved in any other proposal presented so far.
|
0803.3013
|
Alexander Bakulev P.
|
A. P. Bakulev and S. V. Mikhailov
|
Resummation in (F)APT
|
Written version of the talk given at the Memorial Igor Solovtsov
Seminar, held on January 17--18, 2008, at the Bogoliubov Laboratory of
Theoretical Physics, JINR (Dubna). 15 pages, 1 figure, 1 table. Misprints are
corrected and style of proceedings is reproduced
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present new results on the summation of nonpower-series expansions in QCD
Analytic Perturbation Theory (APT) in the one-loop approximation. We show how
to generalize the approach suggested by one of us earlier to the cases of APT
and Fractional APT (FAPT) with heavy-quark thresholds. Using this approach we
analyze the Higgs boson decay $H^0\to\bar{b}b$. We produce estimations of the
higher-order corrections importance in (F)APT and present a very transparent
interpretation of the resummation results in terms of $\Lambda_\text{QCD}$
shifts.
|
[
{
"created": "Thu, 20 Mar 2008 15:50:08 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Mar 2008 15:58:51 GMT",
"version": "v2"
}
] |
2008-03-27
|
[
[
"Bakulev",
"A. P.",
""
],
[
"Mikhailov",
"S. V.",
""
]
] |
We present new results on the summation of nonpower-series expansions in QCD Analytic Perturbation Theory (APT) in the one-loop approximation. We show how to generalize the approach suggested by one of us earlier to the cases of APT and Fractional APT (FAPT) with heavy-quark thresholds. Using this approach we analyze the Higgs boson decay $H^0\to\bar{b}b$. We produce estimations of the higher-order corrections importance in (F)APT and present a very transparent interpretation of the resummation results in terms of $\Lambda_\text{QCD}$ shifts.
|
1605.04345
|
Stefano Carrazza
|
Stefano Carrazza, Jos\'e I. Latorre
|
Towards the compression of parton densities through machine learning
algorithms
|
4 pages, 4 figures, to appear in the proceedings of 50th Rencontres
de Moriond, QCD and High Energy Interactions, La Thuile, Italy, March 2016
| null | null | null |
hep-ph hep-ex physics.data-an
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One of the most fascinating challenges in the context of parton density
function (PDF) is the determination of the best combined PDF uncertainty from
individual PDF sets. Since 2014 multiple methodologies have been developed to
achieve this goal. In this proceedings we first summarize the strategy adopted
by the PDF4LHC15 recommendation and then, we discuss about a new approach to
Monte Carlo PDF compression based on clustering through machine learning
algorithms.
|
[
{
"created": "Fri, 13 May 2016 22:27:00 GMT",
"version": "v1"
},
{
"created": "Tue, 17 May 2016 11:46:11 GMT",
"version": "v2"
}
] |
2016-05-18
|
[
[
"Carrazza",
"Stefano",
""
],
[
"Latorre",
"José I.",
""
]
] |
One of the most fascinating challenges in the context of parton density function (PDF) is the determination of the best combined PDF uncertainty from individual PDF sets. Since 2014 multiple methodologies have been developed to achieve this goal. In this proceedings we first summarize the strategy adopted by the PDF4LHC15 recommendation and then, we discuss about a new approach to Monte Carlo PDF compression based on clustering through machine learning algorithms.
|
hep-ph/0004266
|
Junji Hisano
|
J. Hisano
|
Proton Decay in the Supersymmetric Grand Unified Models
|
11 pages.Talk presented at Workshop on Neutrino Oscillations and
Their Origin, Fujiyoshida, Japan, February 11-13, 2000, to appear in
Proceedings published by Universal Academy Press, Tokyo. We add a new
reference and correct types in the revised version
| null | null | null |
hep-ph
| null |
In this article we review proton decay in the supersymmetric grand unified
models.
|
[
{
"created": "Fri, 28 Apr 2000 09:49:49 GMT",
"version": "v1"
},
{
"created": "Mon, 1 May 2000 11:21:56 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Hisano",
"J.",
""
]
] |
In this article we review proton decay in the supersymmetric grand unified models.
|
1309.1985
|
Oleg Teryaev
|
Oleg Teryaev
|
Analyticity and higher twists
|
5 pages, 1 figure;Updated contribution based on the talk given at the
conference "Hadron Structure'13", 30 June - 4 July, 2013, Tatranske Matliare,
Slovak Republic
| null |
10.1016/j.nuclphysbps.2013.10.039
| null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The representation for infinite sum of higher twists (HT) tower in DIS
implied by analyticity of virtual Compton amplitude is suggested. Its simplest
realization allows to describe the Bjorken sum rule at all momentum transfers.
It is stressed that TMDs accommodate the infinite tower of HT similar to
non-local vacuum condensates for the case of vacuum matrix element. The D-term
in hadronic GPDs bears some similarity to vacuum cosmological constant. The
negative sign of D-term may be understood as a similarity between inflation and
annihilation via the graviton exchange.
|
[
{
"created": "Sun, 8 Sep 2013 18:07:13 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Teryaev",
"Oleg",
""
]
] |
The representation for infinite sum of higher twists (HT) tower in DIS implied by analyticity of virtual Compton amplitude is suggested. Its simplest realization allows to describe the Bjorken sum rule at all momentum transfers. It is stressed that TMDs accommodate the infinite tower of HT similar to non-local vacuum condensates for the case of vacuum matrix element. The D-term in hadronic GPDs bears some similarity to vacuum cosmological constant. The negative sign of D-term may be understood as a similarity between inflation and annihilation via the graviton exchange.
|
hep-ph/0202260
|
tsukerman ilya
|
I. Tsukerman (for the CHORUS Collaboration)
|
MC generators in CHORUS
|
6 pages, LaTeX two-column format, 2 encapsulated postscript figures
Proceedings of NuInt01 Workshop (KEK, Tsukuba, Japan, 13-16.12.2001)
|
Nucl.Phys.Proc.Suppl. 112 (2002) 177-182
|
10.1016/S0920-5632(02)01763-2
| null |
hep-ph
| null |
This note presents an overview of general-purpose and specific Monte-Carlo
event generators used in the simulation of the CERN - CHORUS experiment, aiming
to search for $\nu_{\mu} \to \nu_{\tau}$ oscillations and charm particle decays
in an emulsion target.
|
[
{
"created": "Wed, 27 Feb 2002 12:12:12 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Tsukerman",
"I.",
"",
"for the CHORUS Collaboration"
]
] |
This note presents an overview of general-purpose and specific Monte-Carlo event generators used in the simulation of the CERN - CHORUS experiment, aiming to search for $\nu_{\mu} \to \nu_{\tau}$ oscillations and charm particle decays in an emulsion target.
|
1803.06831
|
Ulas Ozdem
|
U. Ozdem and K. Azizi
|
Electromagnetic multipole moments of the $P_c^+(4380)$ pentaquark in
light-cone QCD
|
10 pages, 1 figure and 1 table
|
Eur. Phys. J. C (2018) 78:379
|
10.1140/epjc/s10052-018-5873-2
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
We calculate the electromagnetic multipole moments of the $P_c^+(4380)$
pentaquark by modeling it as the diquark-diquark-antiquark and $\bar
D^*\Sigma_c$ molecular state with quantum numbers $J^P = \frac{3}{2}^-$. In
particular, the magnetic dipole, electric quadrupole and magnetic octupole
moments of this particle are extracted in the framework of light-cone QCD sum
rule. The values of the electromagnetic multipole moments obtained via two
pictures differ substantially from each other, which can be used to pin down
the underlying structure of $P_c^+(4380)$. The comparison of any future
experimental data on the electromagnetic multipole moments of the $P_c^+(4380)$
pentaquark with the results of the present work can shed light on the nature
and inner quark organization of this state.
|
[
{
"created": "Mon, 19 Mar 2018 08:55:34 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2018 13:34:15 GMT",
"version": "v2"
},
{
"created": "Sat, 12 May 2018 20:08:40 GMT",
"version": "v3"
}
] |
2018-06-13
|
[
[
"Ozdem",
"U.",
""
],
[
"Azizi",
"K.",
""
]
] |
We calculate the electromagnetic multipole moments of the $P_c^+(4380)$ pentaquark by modeling it as the diquark-diquark-antiquark and $\bar D^*\Sigma_c$ molecular state with quantum numbers $J^P = \frac{3}{2}^-$. In particular, the magnetic dipole, electric quadrupole and magnetic octupole moments of this particle are extracted in the framework of light-cone QCD sum rule. The values of the electromagnetic multipole moments obtained via two pictures differ substantially from each other, which can be used to pin down the underlying structure of $P_c^+(4380)$. The comparison of any future experimental data on the electromagnetic multipole moments of the $P_c^+(4380)$ pentaquark with the results of the present work can shed light on the nature and inner quark organization of this state.
|
hep-ph/0101014
|
Piotr Chankowski
|
Wojciech Krolikowski (Warsaw)
|
Possible LSND effect as a small perturbation of the bimaximal texture
for three active neutrinos
|
9 pages, no figures
|
Acta Phys.Polon. B32 (2001) 1245-1252
| null |
IFT-01/01
|
hep-ph
| null |
A particular form of mixing matrix for three active and one sterile neutrinos
is proposed. Its $3\times 3 $ part describing three active neutrinos arises
from the popular bimaximal mixing matrix that works satisfactorily in solar and
atmospheric experiments if the LSND effect is ignored. Then, the sterile
neutrino, effective in the fourth row and fourth column of the proposed mixing
matrix, is responsible for the possible LSND effect by inducing one extra
neutrino mass state to exist actively. The LSND effect, if it exists, turns out
to reveal its {\it perturbative} nature related to small mixing of three active
neutrinos with their sterile partner.
|
[
{
"created": "Tue, 2 Jan 2001 10:05:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Krolikowski",
"Wojciech",
"",
"Warsaw"
]
] |
A particular form of mixing matrix for three active and one sterile neutrinos is proposed. Its $3\times 3 $ part describing three active neutrinos arises from the popular bimaximal mixing matrix that works satisfactorily in solar and atmospheric experiments if the LSND effect is ignored. Then, the sterile neutrino, effective in the fourth row and fourth column of the proposed mixing matrix, is responsible for the possible LSND effect by inducing one extra neutrino mass state to exist actively. The LSND effect, if it exists, turns out to reveal its {\it perturbative} nature related to small mixing of three active neutrinos with their sterile partner.
|
hep-ph/9903515
|
David A. Kosower
|
David A. Kosower, Peter Uwer (Saclay)
|
One-Loop Splitting Amplitudes in Gauge Theory
|
two references added, minor changes in the text
|
Nucl.Phys.B563:477-505,1999
|
10.1016/S0550-3213(99)00583-0
|
SPhT-T99/032
|
hep-ph
| null |
We recompute the functions describing the collinear factorization of one-loop
amplitudes using the unitarity-based method. We present the results in a form
suitable for use as an ingredient in two-loop calculations. We also present a
function summarizing the behavior at one loop in both the soft and collinear
limits.
|
[
{
"created": "Mon, 29 Mar 1999 16:43:52 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Apr 1999 07:35:21 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kosower",
"David A.",
"",
"Saclay"
],
[
"Uwer",
"Peter",
"",
"Saclay"
]
] |
We recompute the functions describing the collinear factorization of one-loop amplitudes using the unitarity-based method. We present the results in a form suitable for use as an ingredient in two-loop calculations. We also present a function summarizing the behavior at one loop in both the soft and collinear limits.
|
0803.2368
|
Maria-Paola Lombardo
|
C. Davies, S. Faccini, H. Lipkin, L. Maiani (Chair), F. J. Yndurain
(Panel); C. Bugg, S. Eidelman, P. Faccioli, S. Glazek, Y. Glozman, E. Klempt,
H. Koch, J. Lee-Franzini, R. Mussa, E. Pallante, S. Paul, K. Seth, U. Wiedner
(Contributors); M.P. Lombardo, S. Miscetti, S. Pacetti (Convenors)
|
Methods and Models for Hadron Physics
|
17 pages, 2 figures; Round Table held during Hadron07, the XII
International Conference on Hadron Spectroscopy, 8-13 October 2007,
Laboratori Nazionali di Frascati (Rome), Italy
|
Frascati Phys.Ser.46:,2007
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A round table held during the Hadron07 Conference focusing on experimental
observations of new hadronic states, on theoretical perspectives for their
description, and on the role of hadronic spectroscopy in furthering our
knowledge of the fundamental theory of strong interactions.
|
[
{
"created": "Sun, 16 Mar 2008 19:08:41 GMT",
"version": "v1"
}
] |
2009-07-07
|
[
[
"Davies",
"C.",
"",
"Chair"
],
[
"Faccini",
"S.",
"",
"Chair"
],
[
"Lipkin",
"H.",
"",
"Chair"
],
[
"Maiani",
"L.",
"",
"Chair"
],
[
"Yndurain",
"F. J.",
"",
"Panel"
],
[
"Bugg",
"; C.",
"",
"Contributors"
],
[
"Eidelman",
"S.",
"",
"Contributors"
],
[
"Faccioli",
"P.",
"",
"Contributors"
],
[
"Glazek",
"S.",
"",
"Contributors"
],
[
"Glozman",
"Y.",
"",
"Contributors"
],
[
"Klempt",
"E.",
"",
"Contributors"
],
[
"Koch",
"H.",
"",
"Contributors"
],
[
"Lee-Franzini",
"J.",
"",
"Contributors"
],
[
"Mussa",
"R.",
"",
"Contributors"
],
[
"Pallante",
"E.",
"",
"Contributors"
],
[
"Paul",
"S.",
"",
"Contributors"
],
[
"Seth",
"K.",
"",
"Contributors"
],
[
"Wiedner",
"U.",
"",
"Contributors"
],
[
"Lombardo",
"; M. P.",
"",
"Convenors"
],
[
"Miscetti",
"S.",
"",
"Convenors"
],
[
"Pacetti",
"S.",
"",
"Convenors"
]
] |
A round table held during the Hadron07 Conference focusing on experimental observations of new hadronic states, on theoretical perspectives for their description, and on the role of hadronic spectroscopy in furthering our knowledge of the fundamental theory of strong interactions.
|
1607.06559
|
Hiroki Nishihara
|
Hiroki Nishihara and Masayasu Harada
|
Relations among pionic decays of spin-1 mesons from an SU(4)$\times$U(1)
emergent symmetry in QCD
|
17 pages, 3 figures, 8 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by recent results by lattice analysis, we assume that the spin-1
mesons of $\left( \rho, \omega, a_1, \rho', \omega', b_1, f_1, h_1\right)$ make
a representation of $\mathbf{16}$ of U(4) emergent symmetry in two-flavor QCD
when the chiral symmetry is not broken. We study the decay properties of the
spin-1 mesons by using a chiral model with an SU(4)$\times$U(1) hidden local
symmetry. We first show that, since the SU(4) symmetry is spontaneously broken
together with the chiral symmetry, each coupling of the interaction among one
pion and two spin-1 mesons is proportional to the mass difference of the
relevant spin-1 mesons similarly to the Goldberger-Treiman relation. In
addition, some of one-pion couplings are related with each other by the SU(4)
symmetry. We further show that there is a relation among the mass of $\rho'$
meson, the $\rho'\pi\pi$ coupling and the $\rho'$-photon mixing strength as
well as the Kawarabayashi-Suzuki-Riazuddin-Fayyazuddin relation for the $\rho$
meson. From the relations, we give numerical predictions such as ratios of the
spin-1 meson decay widths, which are compared with future experiments for
testing the existence of the U(4) emergent symmetry.
|
[
{
"created": "Fri, 22 Jul 2016 05:09:14 GMT",
"version": "v1"
}
] |
2016-07-25
|
[
[
"Nishihara",
"Hiroki",
""
],
[
"Harada",
"Masayasu",
""
]
] |
Motivated by recent results by lattice analysis, we assume that the spin-1 mesons of $\left( \rho, \omega, a_1, \rho', \omega', b_1, f_1, h_1\right)$ make a representation of $\mathbf{16}$ of U(4) emergent symmetry in two-flavor QCD when the chiral symmetry is not broken. We study the decay properties of the spin-1 mesons by using a chiral model with an SU(4)$\times$U(1) hidden local symmetry. We first show that, since the SU(4) symmetry is spontaneously broken together with the chiral symmetry, each coupling of the interaction among one pion and two spin-1 mesons is proportional to the mass difference of the relevant spin-1 mesons similarly to the Goldberger-Treiman relation. In addition, some of one-pion couplings are related with each other by the SU(4) symmetry. We further show that there is a relation among the mass of $\rho'$ meson, the $\rho'\pi\pi$ coupling and the $\rho'$-photon mixing strength as well as the Kawarabayashi-Suzuki-Riazuddin-Fayyazuddin relation for the $\rho$ meson. From the relations, we give numerical predictions such as ratios of the spin-1 meson decay widths, which are compared with future experiments for testing the existence of the U(4) emergent symmetry.
|
hep-ph/9211253
| null |
Geoffrey T. Bodwin, Eric Braaten, G. Peter Lepage
|
Rigorous QCD Predictions for Decays of P-Wave Quarkonia
|
(minor revisions to clarify concepts, fix typos), 4 pages,
ANL-HEP-CP-92-109
| null | null | null |
hep-ph
| null |
We present a new factorization theorem for the decay rates of P-wave states
of heavy quarkonia. Infrared logarithms that had appeared in previous
perturbative calculations of P-wave decays are absorbed into a quantity that is
related to the amplitude for the heavy quark and antiquark to be in a relative
color-octet S-wave state. We predict all of the light-hadronic and
electromagnetic decays rates of the $\chi_c$ and $h_c$ states in terms of two
phenomenological parameters.
|
[
{
"created": "Tue, 17 Nov 1992 00:11:33 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 1992 20:54:44 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Nov 1992 23:55:03 GMT",
"version": "v3"
}
] |
2008-02-03
|
[
[
"Bodwin",
"Geoffrey T.",
""
],
[
"Braaten",
"Eric",
""
],
[
"Lepage",
"G. Peter",
""
]
] |
We present a new factorization theorem for the decay rates of P-wave states of heavy quarkonia. Infrared logarithms that had appeared in previous perturbative calculations of P-wave decays are absorbed into a quantity that is related to the amplitude for the heavy quark and antiquark to be in a relative color-octet S-wave state. We predict all of the light-hadronic and electromagnetic decays rates of the $\chi_c$ and $h_c$ states in terms of two phenomenological parameters.
|
hep-ph/0606156
|
Nobuchika Okada
|
Hideo Itoh, Nobuchika Okada and Toshifumi Yamashita
|
Low scale gravity mediation with warped extra dimension and collider
phenomenology on the hidden sector
|
18 pages, 4 figures. typographical errors have been corrected and a
few new comments have been added
|
Phys.Rev. D74 (2006) 055005
|
10.1103/PhysRevD.74.055005
|
KEK-TH-1086, SISSA 33/2006/EP
|
hep-ph hep-ex hep-th
| null |
We propose a scenario of gravity mediated supersymmetry breaking (gravity
mediation) in a supersymmetric Randall-Sundrum model. In our setup, both of the
visible sector and the hidden sector co-exist on the infrared (IR) brane. We
introduce the Polonyi model as a simple hidden sector. Due to the warped
metric, the effective cutoff scale on the IR brane is ``warped down'', so that
the gravity mediation occurs at a low scale. As a result, the gravitino is
naturally the lightest superpartner (LSP) and contact interactions between the
hidden and the visible sector fields become stronger. We address
phenomenologies for various IR cutoff scales. In particular, we investigate
collider phenomenology involving a scalar field (Polonyi field) in the hidden
sector for the case with the IR cutoff around 10 TeV. We find a possibility
that the hidden sector scalar can be produced at the LHC and the International
Linear Collider (ILC). Interestingly, the scalar behaves like the Higgs boson
of the standard model in the production process, while its decay process is
quite different and, once produced, it will provide us with a very clean
signature. The hidden sector may be no longer hidden.
|
[
{
"created": "Wed, 14 Jun 2006 00:07:42 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2006 14:07:49 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Jul 2006 14:50:34 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Itoh",
"Hideo",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] |
We propose a scenario of gravity mediated supersymmetry breaking (gravity mediation) in a supersymmetric Randall-Sundrum model. In our setup, both of the visible sector and the hidden sector co-exist on the infrared (IR) brane. We introduce the Polonyi model as a simple hidden sector. Due to the warped metric, the effective cutoff scale on the IR brane is ``warped down'', so that the gravity mediation occurs at a low scale. As a result, the gravitino is naturally the lightest superpartner (LSP) and contact interactions between the hidden and the visible sector fields become stronger. We address phenomenologies for various IR cutoff scales. In particular, we investigate collider phenomenology involving a scalar field (Polonyi field) in the hidden sector for the case with the IR cutoff around 10 TeV. We find a possibility that the hidden sector scalar can be produced at the LHC and the International Linear Collider (ILC). Interestingly, the scalar behaves like the Higgs boson of the standard model in the production process, while its decay process is quite different and, once produced, it will provide us with a very clean signature. The hidden sector may be no longer hidden.
|
1011.0547
|
Maria Gomez Rocha
|
Mar\'ia G\'omez Rocha and Wolfgang Schweiger
|
Form factors of heavy-light systems in point-form relativistic quantum
mechanics: the Isgur-Wise function
|
Presented at the 21st European Conference on Few-Body Problems in
Physics, Salamanca, Spain, 30 August - 3 September 2010
|
Few Body Syst.50:227-229,2011
|
10.1007/s00601-010-0121-9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate electromagnetic and weak form factors of heavy-light mesons in
the context of point-form relativistic quantum mechanics. To this aim we treat
the physical processes from which such electroweak form factors are extracted
by means of a coupled channel approach which accounts for the dynamics of the
intermediate gauge bosons. It is shown that heavy-quark symmetry is respected
by this formulation. A simple analytical expression is obtained for the
Isgur-Wise function in the heavy-quark limit. Breaking of heavy-quark symmetry
due to realistic values of the heavy-quark mass are studied numerically.
|
[
{
"created": "Tue, 2 Nov 2010 09:28:49 GMT",
"version": "v1"
}
] |
2011-04-28
|
[
[
"Rocha",
"María Gómez",
""
],
[
"Schweiger",
"Wolfgang",
""
]
] |
We investigate electromagnetic and weak form factors of heavy-light mesons in the context of point-form relativistic quantum mechanics. To this aim we treat the physical processes from which such electroweak form factors are extracted by means of a coupled channel approach which accounts for the dynamics of the intermediate gauge bosons. It is shown that heavy-quark symmetry is respected by this formulation. A simple analytical expression is obtained for the Isgur-Wise function in the heavy-quark limit. Breaking of heavy-quark symmetry due to realistic values of the heavy-quark mass are studied numerically.
|
hep-ph/0106197
|
Sandy Donnachie
|
A Donnachie
|
Light Vector Meson Spectroscopy
|
Paper T05 presented at the Workshop on e+e- Physics at Intermediate
Energies, SLAC, May 2001
|
eConf C010430:T05,2001
| null | null |
hep-ph
| null |
The current situation for vector meson spectroscopy is outlined, and it is
shown that the data are inconsistent with the generally-accepted model for
meson decay. A possible resolution in terms of exotic (hybrid) mesons is given.
Although this hypothesis resolves some of the issues, fresh theoretical
questions are raised. It is argued that high-precision $e^+e^-$ annihilation
data provide an excellent laboratory for studying many aspects of
nonperturbative QCD.
|
[
{
"created": "Mon, 18 Jun 2001 15:49:37 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Donnachie",
"A",
""
]
] |
The current situation for vector meson spectroscopy is outlined, and it is shown that the data are inconsistent with the generally-accepted model for meson decay. A possible resolution in terms of exotic (hybrid) mesons is given. Although this hypothesis resolves some of the issues, fresh theoretical questions are raised. It is argued that high-precision $e^+e^-$ annihilation data provide an excellent laboratory for studying many aspects of nonperturbative QCD.
|
0901.4021
|
Yu Jia
|
Yu Jia, Jia Xu and Juan Zhang
|
"Hard-scattering" approach to very hindered magnetic-dipole transitions
in quarkonium
|
v3; 5 pages, 1 figure and 1 table; title changed, presentation
improved
|
Phys.Rev.D82:014008,2010
|
10.1103/PhysRevD.82.014008
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For a class of hindered magnetic dipole ($M1$) transition processes, such as
$\Upsilon(3S)\to \eta_b+\gamma$ (the discovery channel of the $\eta_b$ meson),
the emitted photon is rather energetic so that the traditional approaches based
on multipole expansion may be invalidated. We propose that a "hard-scattering"
picture, somewhat analogous to the pion electromagnetic form factor at large
momentum transfer, may be more plausible to describe such types of transition
processes. We work out a simple factorization formula at lowest order in the
strong coupling constant, which involves convolution of the Schr\"odinger wave
functions of quarkonia with a perturbatively calculable part induced by
exchange of one semihard gluon between quark and antiquark. This formula,
without any freely adjustable parameters, is found to agree with the measured
rate of $\Upsilon(3S)\to \eta_b+\gamma$ rather well, and can also reasonably
account for other recently measured hindered $M1$ transition rates. The
branching fractions of $\Upsilon(4S)\to \eta_b^{(\prime)}+\gamma$ are also
predicted.
|
[
{
"created": "Mon, 26 Jan 2009 18:00:27 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2009 14:11:14 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Jun 2010 17:10:41 GMT",
"version": "v3"
}
] |
2010-07-20
|
[
[
"Jia",
"Yu",
""
],
[
"Xu",
"Jia",
""
],
[
"Zhang",
"Juan",
""
]
] |
For a class of hindered magnetic dipole ($M1$) transition processes, such as $\Upsilon(3S)\to \eta_b+\gamma$ (the discovery channel of the $\eta_b$ meson), the emitted photon is rather energetic so that the traditional approaches based on multipole expansion may be invalidated. We propose that a "hard-scattering" picture, somewhat analogous to the pion electromagnetic form factor at large momentum transfer, may be more plausible to describe such types of transition processes. We work out a simple factorization formula at lowest order in the strong coupling constant, which involves convolution of the Schr\"odinger wave functions of quarkonia with a perturbatively calculable part induced by exchange of one semihard gluon between quark and antiquark. This formula, without any freely adjustable parameters, is found to agree with the measured rate of $\Upsilon(3S)\to \eta_b+\gamma$ rather well, and can also reasonably account for other recently measured hindered $M1$ transition rates. The branching fractions of $\Upsilon(4S)\to \eta_b^{(\prime)}+\gamma$ are also predicted.
|
2211.08450
|
Dean Robinson
|
Thomas Gorordo, Simon Knapen, Benjamin Nachman, Dean J. Robinson, Adi
Suresh
|
Geometry Optimization for Long-lived Particle Detectors
|
46 pages, 11 figures, 3 tables
| null | null | null |
hep-ph hep-ex physics.ins-det
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The proposed designs of many auxiliary long-lived particle (LLP) detectors at
the LHC call for the instrumentation of a large surface area inside the
detector volume, in order to reliably reconstruct tracks and LLP decay
vertices. Taking the CODEX-b detector as an example, we provide a
proof-of-concept optimization analysis that demonstrates the required
instrumented surface area can be substantially reduced for many LLP models,
while only marginally affecting the LLP signal efficiency. This optimization
permits a significant reduction in cost and installation time, and may also
inform the installation order for modular detector elements. We derive a
branch-and-bound based optimization algorithm that permits highly
computationally efficient determination of optimal detector configurations,
subject to any specified LLP vertex and track reconstruction requirements. We
outline the features of a newly-developed generalized simulation framework, for
the computation of LLP signal efficiencies across a range of LLP models and
detector geometries.
|
[
{
"created": "Tue, 15 Nov 2022 19:03:52 GMT",
"version": "v1"
}
] |
2022-11-21
|
[
[
"Gorordo",
"Thomas",
""
],
[
"Knapen",
"Simon",
""
],
[
"Nachman",
"Benjamin",
""
],
[
"Robinson",
"Dean J.",
""
],
[
"Suresh",
"Adi",
""
]
] |
The proposed designs of many auxiliary long-lived particle (LLP) detectors at the LHC call for the instrumentation of a large surface area inside the detector volume, in order to reliably reconstruct tracks and LLP decay vertices. Taking the CODEX-b detector as an example, we provide a proof-of-concept optimization analysis that demonstrates the required instrumented surface area can be substantially reduced for many LLP models, while only marginally affecting the LLP signal efficiency. This optimization permits a significant reduction in cost and installation time, and may also inform the installation order for modular detector elements. We derive a branch-and-bound based optimization algorithm that permits highly computationally efficient determination of optimal detector configurations, subject to any specified LLP vertex and track reconstruction requirements. We outline the features of a newly-developed generalized simulation framework, for the computation of LLP signal efficiencies across a range of LLP models and detector geometries.
|
0912.0612
|
Bo-Qiang Ma
|
Wen Qian, Bo-Qiang Ma
|
Tri-meson-mixing of $\pi$-$\eta$-$\eta'$ and $\rho$-$\omega$-$\phi$ in
the light-cone quark model
|
8 pages, 6 figures, final version to appear in EPJC
|
Eur.Phys.J.C65:457-465,2010
|
10.1140/epjc/s10052-009-1220-y
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The radiative transition form factors of the pseudoscalar mesons {$\pi$,
$\eta$, $\eta'$} and the vector mesons {$\rho$, $\omega$, $\phi$} are restudied
with $\pi$-$\eta$-$\eta'$ and $\rho$-$\omega$-$\phi$ in tri-meson-mixing
pattern, which is described by tri-mixing matrices in the light-cone
constituent quark model. The experimental transition decay widths are better
reproduced with tri-meson-mixing than previous results in a two-mixing-angle
scenario of only two-meson $\eta$-$\eta'$ mixing and $\omega$-$\phi$ mixing.
|
[
{
"created": "Thu, 3 Dec 2009 10:36:02 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Dec 2009 05:38:45 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Jan 2010 08:12:58 GMT",
"version": "v3"
}
] |
2014-11-20
|
[
[
"Qian",
"Wen",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
The radiative transition form factors of the pseudoscalar mesons {$\pi$, $\eta$, $\eta'$} and the vector mesons {$\rho$, $\omega$, $\phi$} are restudied with $\pi$-$\eta$-$\eta'$ and $\rho$-$\omega$-$\phi$ in tri-meson-mixing pattern, which is described by tri-mixing matrices in the light-cone constituent quark model. The experimental transition decay widths are better reproduced with tri-meson-mixing than previous results in a two-mixing-angle scenario of only two-meson $\eta$-$\eta'$ mixing and $\omega$-$\phi$ mixing.
|
2309.03146
|
Henning Bahl
|
Henning Bahl, Elina Fuchs, Marc Hannig, Marco Menen
|
Classifying the CP properties of the ggH coupling in H+2j production
|
41 pages, 18 figures
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The Higgs-gluon interaction is crucial for LHC phenomenology. To improve the
constraints on the CP structure of this coupling, we investigate Higgs
production with two jets using machine learning. In particular, we exploit the
CP sensitivity of the so far neglected phase space region that differs from the
typical vector boson fusion-like kinematics. Our results suggest that
significant improvements in current experimental limits are possible. We also
discuss the most relevant observables and how CP violation in the Higgs-gluon
interaction can be disentangled from CP violation in the interaction between
the Higgs boson and massive vector bosons. Assuming the absence of CP-violating
Higgs interactions with coloured beyond-the-Standard-Model states, our
projected limits on a CP-violating top-Yukawa coupling are stronger than more
direct probes like top-associated Higgs production and limits from a global
fit.
|
[
{
"created": "Wed, 6 Sep 2023 16:43:24 GMT",
"version": "v1"
}
] |
2023-09-07
|
[
[
"Bahl",
"Henning",
""
],
[
"Fuchs",
"Elina",
""
],
[
"Hannig",
"Marc",
""
],
[
"Menen",
"Marco",
""
]
] |
The Higgs-gluon interaction is crucial for LHC phenomenology. To improve the constraints on the CP structure of this coupling, we investigate Higgs production with two jets using machine learning. In particular, we exploit the CP sensitivity of the so far neglected phase space region that differs from the typical vector boson fusion-like kinematics. Our results suggest that significant improvements in current experimental limits are possible. We also discuss the most relevant observables and how CP violation in the Higgs-gluon interaction can be disentangled from CP violation in the interaction between the Higgs boson and massive vector bosons. Assuming the absence of CP-violating Higgs interactions with coloured beyond-the-Standard-Model states, our projected limits on a CP-violating top-Yukawa coupling are stronger than more direct probes like top-associated Higgs production and limits from a global fit.
|
hep-ph/0103335
|
Renard Fernand Michel
|
M. Beccaria, F.M. Renard and C. Verzegnassi
|
The role of universal and non universal Sudakov logarithms in four
fermion processes at TeV energies: the one-loop approximation revisited
|
22 pages and 13 figures; version to appear in Phys.Rev.D. e-mail:
renard@lpm.univ-montp2.fr
|
Phys.Rev. D64 (2001) 073008
|
10.1103/PhysRevD.64.073008
|
PM/01-16
|
hep-ph
| null |
We consider the separate effects on four fermion processes, in the TeV energy
range, produced at one loop by Sudakov logarithms of universal and not
universal kind, working in the 't Hooft xi=1 gauge. Summing the various vertex
and box contributions allows to isolate two quite different terms.The first one
is a combination of vertex and box quadratic and linear logarithms that are
partially universal and partially not universal and independent of the
scattering angle theta. The second one is theta-dependent, not universal,
linearly logarithmic and only produced by weak boxes. We show that for several
observables, measurable at future linear e+e- colliders (LC, CLIC), the role of
the latter term is dominant and we discuss the implications of this fact for
what concerns the reliability of a one-loop approximation.
|
[
{
"created": "Fri, 30 Mar 2001 12:32:09 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jun 2001 05:31:53 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Beccaria",
"M.",
""
],
[
"Renard",
"F. M.",
""
],
[
"Verzegnassi",
"C.",
""
]
] |
We consider the separate effects on four fermion processes, in the TeV energy range, produced at one loop by Sudakov logarithms of universal and not universal kind, working in the 't Hooft xi=1 gauge. Summing the various vertex and box contributions allows to isolate two quite different terms.The first one is a combination of vertex and box quadratic and linear logarithms that are partially universal and partially not universal and independent of the scattering angle theta. The second one is theta-dependent, not universal, linearly logarithmic and only produced by weak boxes. We show that for several observables, measurable at future linear e+e- colliders (LC, CLIC), the role of the latter term is dominant and we discuss the implications of this fact for what concerns the reliability of a one-loop approximation.
|
2106.15630
|
Sokratis Trifinopoulos
|
David Marzocca, Sokratis Trifinopoulos, Elena Venturini
|
From B-meson anomalies to Kaon physics with scalar leptoquarks
|
40 pages, 11 figures; v2: references updated
| null |
10.1140/epjc/s10052-022-10271-7
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we study possible connections between $B$-meson anomalies and
Kaon physics observables in the context of combined solutions with the singlet
and triplet scalar leptoquarks $S_1$ and $S_3$. By assuming a flavor structure
for the leptoquark couplings dictated by a minimally broken $U(2)^5$ flavor
symmetry we can make a sharp connection between these two classes of
observables. We find that the bound on $\mathcal{B}(K^+ \rightarrow \pi^+
\nu\nu)$ from NA62 puts already some tension in the model, while the present
limits on $\mathcal{B}(K_L \rightarrow \mu^+ \mu^-)$ and $\mu \to e$ conversion
in nuclei can be saturated. Relaxing instead the flavor assumption we study
what values for $\mathcal{B}(K^+ \rightarrow\pi^+ \nu\nu)$, as well as for
$\mathcal{B}(K_L \rightarrow\pi^0 \nu\nu)$ and $\mathcal{B}(K_{L,S}
\rightarrow\mu^+ \mu^-)$, are viable compatibly with all other phenomenological
constraints.
|
[
{
"created": "Tue, 29 Jun 2021 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Dec 2021 14:36:40 GMT",
"version": "v2"
}
] |
2022-04-27
|
[
[
"Marzocca",
"David",
""
],
[
"Trifinopoulos",
"Sokratis",
""
],
[
"Venturini",
"Elena",
""
]
] |
In this work we study possible connections between $B$-meson anomalies and Kaon physics observables in the context of combined solutions with the singlet and triplet scalar leptoquarks $S_1$ and $S_3$. By assuming a flavor structure for the leptoquark couplings dictated by a minimally broken $U(2)^5$ flavor symmetry we can make a sharp connection between these two classes of observables. We find that the bound on $\mathcal{B}(K^+ \rightarrow \pi^+ \nu\nu)$ from NA62 puts already some tension in the model, while the present limits on $\mathcal{B}(K_L \rightarrow \mu^+ \mu^-)$ and $\mu \to e$ conversion in nuclei can be saturated. Relaxing instead the flavor assumption we study what values for $\mathcal{B}(K^+ \rightarrow\pi^+ \nu\nu)$, as well as for $\mathcal{B}(K_L \rightarrow\pi^0 \nu\nu)$ and $\mathcal{B}(K_{L,S} \rightarrow\mu^+ \mu^-)$, are viable compatibly with all other phenomenological constraints.
|
0909.3108
|
Priyotosh Bandyopadhyay
|
Priyotosh Bandyopadhyay, Biplob Bhattacherjee, AseshKrishna Datta
|
Search for Higgs bosons of the Universal Extra Dimensions at the Large
Hadron Collider
|
25 pages, 9 figures and 1 table
|
JHEP 1003:048,2010
|
10.1007/JHEP03(2010)048
|
HRI-P-09-09-002, RECAPP-HRI-2009-018, CU-PHYSICS/06-2009
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Higgs sector of the Universal Extra Dimensions (UED) has a rather
involved setup. With one extra space dimension, the main ingredients to the
construct are the higher Kaluza-Klein (KK) excitations of the Standard Model
Higgs boson and the fifth components of the gauge fields which on
compactification appear as scalar degrees of freedom and can mix with the
former thus leading to physical KK-Higgs states of the scenario. In this work,
we explore in detail the phenomenology of such a Higgs sector of the UED with
the Large Hadron Collider (LHC) in focus. We work out relevant decay branching
fractions involving the KK-Higgs excitations. Possible production modes of the
KK-Higgs bosons are then discussed with an emphasis on their associated
production with the third generation KK-quarks and that under the cascade
decays of strongly interacting UED excitations which turn out to be the only
phenomenologically significant modes. It is pointed out that the collider
searches of such Higgs bosons face generic hardship due to soft end-products
which result from severe degeneracies in the masses of the involved excitations
in the minimal version of the UED (MUED). Generic implications of either
observing some or all of the KK-Higgs bosons at the LHC are discussed.
|
[
{
"created": "Wed, 16 Sep 2009 20:59:02 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Bandyopadhyay",
"Priyotosh",
""
],
[
"Bhattacherjee",
"Biplob",
""
],
[
"Datta",
"AseshKrishna",
""
]
] |
The Higgs sector of the Universal Extra Dimensions (UED) has a rather involved setup. With one extra space dimension, the main ingredients to the construct are the higher Kaluza-Klein (KK) excitations of the Standard Model Higgs boson and the fifth components of the gauge fields which on compactification appear as scalar degrees of freedom and can mix with the former thus leading to physical KK-Higgs states of the scenario. In this work, we explore in detail the phenomenology of such a Higgs sector of the UED with the Large Hadron Collider (LHC) in focus. We work out relevant decay branching fractions involving the KK-Higgs excitations. Possible production modes of the KK-Higgs bosons are then discussed with an emphasis on their associated production with the third generation KK-quarks and that under the cascade decays of strongly interacting UED excitations which turn out to be the only phenomenologically significant modes. It is pointed out that the collider searches of such Higgs bosons face generic hardship due to soft end-products which result from severe degeneracies in the masses of the involved excitations in the minimal version of the UED (MUED). Generic implications of either observing some or all of the KK-Higgs bosons at the LHC are discussed.
|
hep-ph/9804451
|
Chung Kao
|
V. Barger, Chung Kao and Tianjun Li (University of Wisconsin)
|
Trilepton Signal of Minimal Supergravity at the Tevatron Including
$\tau$-lepton Contributions
|
13 pages, REVTEX, 4 figures
|
Phys.Lett.B433:328-334,1998
|
10.1016/S0370-2693(98)00705-9
|
MADPH--98--1028
|
hep-ph
| null |
The trilepton signal with missing transverse energy ($3\ell+\notE_T$, with
$\ell = e$ or $\mu$) from chargino-neutralino ($\chi^\pm_1 \chi^0_2$)
associated production and decays is studied for the upgraded Fermilab Tevatron
Collider with 2 TeV center of mass energy and integrated luminosity of 2
fb$^{-1}$ (MI) to 20 fb$^{-1}$ (TeV33). In some regions of parameter space in
the minimal supergravity model, $\chi^\pm_1$ and $\chi^0_2$ decay dominantly
into final states with $\tau$ leptons via real or virtual $\tilde{\tau}_1$
sleptons. The contributions from $\tau-$leptonic decays increase the trilepton
signal from $\chi^\pm_1 \chi^0_2$ by at least a factor of two when soft but
realistic cuts on lepton transverse momenta are used. With the Main Injector, a
trilepton signal can be detected at $\tan\beta \equiv v_2/v_1 \sim 3$ for
universal masses $m_{1/2}, m_0 \alt$ 200 GeV.
|
[
{
"created": "Wed, 29 Apr 1998 21:44:42 GMT",
"version": "v1"
}
] |
2009-09-15
|
[
[
"Barger",
"V.",
"",
"University of Wisconsin"
],
[
"Kao",
"Chung",
"",
"University of Wisconsin"
],
[
"Li",
"Tianjun",
"",
"University of Wisconsin"
]
] |
The trilepton signal with missing transverse energy ($3\ell+\notE_T$, with $\ell = e$ or $\mu$) from chargino-neutralino ($\chi^\pm_1 \chi^0_2$) associated production and decays is studied for the upgraded Fermilab Tevatron Collider with 2 TeV center of mass energy and integrated luminosity of 2 fb$^{-1}$ (MI) to 20 fb$^{-1}$ (TeV33). In some regions of parameter space in the minimal supergravity model, $\chi^\pm_1$ and $\chi^0_2$ decay dominantly into final states with $\tau$ leptons via real or virtual $\tilde{\tau}_1$ sleptons. The contributions from $\tau-$leptonic decays increase the trilepton signal from $\chi^\pm_1 \chi^0_2$ by at least a factor of two when soft but realistic cuts on lepton transverse momenta are used. With the Main Injector, a trilepton signal can be detected at $\tan\beta \equiv v_2/v_1 \sim 3$ for universal masses $m_{1/2}, m_0 \alt$ 200 GeV.
|
hep-ph/9709403
|
Renard Fernand Michel
|
F.M. Renard and C. Verzegnassi
|
Identification of Virtual New Physics Effects at a Linear Collider
|
10 pages and 4 figures. e-mail: renard@lpm.univ-montp2.fr
| null | null |
PM/97-29
|
hep-ph
| null |
It is shown that, at a 500 GeV LC, a number of different theoretical models
would be unambigously identified by their virtual effects. Negative limits in
case of no signal identification are also derived.
|
[
{
"created": "Fri, 19 Sep 1997 12:23:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Renard",
"F. M.",
""
],
[
"Verzegnassi",
"C.",
""
]
] |
It is shown that, at a 500 GeV LC, a number of different theoretical models would be unambigously identified by their virtual effects. Negative limits in case of no signal identification are also derived.
|
2404.06116
|
Mikko Laine
|
M. Eriksson, M. Laine
|
Soft contributions to the thermal Higgs width across an electroweak
phase transition
|
30 pages. v2: clarifications added
|
JCAP 06 (2024) 016
|
10.1088/1475-7516/2024/06/016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We estimate the equilibration rate of a nearly homogeneous Higgs field,
displaced from its ground state during the onset of an electroweak phase
transition. The computation is carried out with Hard Thermal Loop resummed
perturbation theory, and a significant part of the result originates from
Bose-enhanced $t$-channel $2\leftrightarrow 2$ scatterings. The expression is
shown to be IR finite and gauge independent. Possible applications to Langevin
simulations of bubble nucleation are mentioned, and we also contrast with the
friction affecting bubble growth.
|
[
{
"created": "Tue, 9 Apr 2024 08:38:54 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2024 11:18:23 GMT",
"version": "v2"
}
] |
2024-06-17
|
[
[
"Eriksson",
"M.",
""
],
[
"Laine",
"M.",
""
]
] |
We estimate the equilibration rate of a nearly homogeneous Higgs field, displaced from its ground state during the onset of an electroweak phase transition. The computation is carried out with Hard Thermal Loop resummed perturbation theory, and a significant part of the result originates from Bose-enhanced $t$-channel $2\leftrightarrow 2$ scatterings. The expression is shown to be IR finite and gauge independent. Possible applications to Langevin simulations of bubble nucleation are mentioned, and we also contrast with the friction affecting bubble growth.
|
1706.01911
|
Stefan Vogl
|
Aaron Pierce, Nausheen R. Shah and Stefan Vogl
|
Stop Co-Annihilation in the Minimal Supersymmetric Standard Model
Revisited
|
20 pages, 4 figures, matches published version
|
Phys. Rev. D 97, 023008 (2018)
|
10.1103/PhysRevD.97.023008
|
MCTP-17-07, WSU-HEP-1710
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We re-examine the stop co-annihilation scenario of the Minimal Supersymmetric
Standard Model, wherein a bino-like lightest supersymmetric particle has a
thermal relic density set by co-annihilations with a scalar partner of the top
quark in the early universe. We concentrate on the case where only the top
partner sector is relevant for the cosmology, and other particles are heavy. We
discuss the cosmology with focus on low energy parameters and an emphasis on
the implications of the measured Higgs boson mass and its properties. We find
that the irreducible direct detection signal correlated with this cosmology is
generically well below projected experimental sensitivity, and in most cases
lies below the neutrino background. A larger, detectable, direct detection rate
is possible, but is unrelated to the co-annihilation cosmology. LHC searches
for compressed spectra are crucial for probing this scenario.
|
[
{
"created": "Tue, 6 Jun 2017 18:20:55 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jan 2018 10:38:42 GMT",
"version": "v2"
}
] |
2018-01-24
|
[
[
"Pierce",
"Aaron",
""
],
[
"Shah",
"Nausheen R.",
""
],
[
"Vogl",
"Stefan",
""
]
] |
We re-examine the stop co-annihilation scenario of the Minimal Supersymmetric Standard Model, wherein a bino-like lightest supersymmetric particle has a thermal relic density set by co-annihilations with a scalar partner of the top quark in the early universe. We concentrate on the case where only the top partner sector is relevant for the cosmology, and other particles are heavy. We discuss the cosmology with focus on low energy parameters and an emphasis on the implications of the measured Higgs boson mass and its properties. We find that the irreducible direct detection signal correlated with this cosmology is generically well below projected experimental sensitivity, and in most cases lies below the neutrino background. A larger, detectable, direct detection rate is possible, but is unrelated to the co-annihilation cosmology. LHC searches for compressed spectra are crucial for probing this scenario.
|
1101.5605
|
Gustavo Gil da Silveira G.G. Silveira
|
M.B. Gay Ducati, M.M. Machado and G.G. Silveira
|
Single and Central Diffractive Higgs Production at the LHC
|
To appear in the proceedings of Diffraction 2010: International
Workshop on Diffraction in High Energy Physics, Otranto, Italy, 10-15 Sep
2010
| null |
10.1063/1.3601391
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The single and central diffractive production of the Standard Model Higgs
boson is computed using the diffractive factorization formalism, taking into
account a parametrization for the Pomeron structure function provided by the H1
Collaboration. We compute the cross sections at NLO accuracy for the gluon
fusion process, since it is the leading mechanism for the Higgs boson
production. The gap survival probability is also introduced to include the
rescattering corrections due to spectator particles present in the interaction.
The diffractive ratios are predicted for proton-proton collisions at the LHC,
since the beam luminosity is favorable to the Higgs boson detection. These
results provide updated estimations for the fraction of single and central
diffractive events in the LHC kinematical regime.
|
[
{
"created": "Fri, 28 Jan 2011 18:49:45 GMT",
"version": "v1"
}
] |
2015-05-27
|
[
[
"Ducati",
"M. B. Gay",
""
],
[
"Machado",
"M. M.",
""
],
[
"Silveira",
"G. G.",
""
]
] |
The single and central diffractive production of the Standard Model Higgs boson is computed using the diffractive factorization formalism, taking into account a parametrization for the Pomeron structure function provided by the H1 Collaboration. We compute the cross sections at NLO accuracy for the gluon fusion process, since it is the leading mechanism for the Higgs boson production. The gap survival probability is also introduced to include the rescattering corrections due to spectator particles present in the interaction. The diffractive ratios are predicted for proton-proton collisions at the LHC, since the beam luminosity is favorable to the Higgs boson detection. These results provide updated estimations for the fraction of single and central diffractive events in the LHC kinematical regime.
|
hep-ph/9811383
|
Larry Horwitz
|
L.P. Horwitz
|
Lee-Friedrichs Model
|
To be published in Kluwer Encyclopedia of Mathematics;review
| null | null |
TAUP 2512-98
|
hep-ph
| null |
A brief summary of the mathematical structure of the Lee-Friedrichs model is
given, including the natural extension of its Hamiltonian to a Gel'fand triple,
containing a generalized eigenstate for the complex pole. Contains references
to some physical applications and relativistic generalizations.
|
[
{
"created": "Wed, 18 Nov 1998 11:31:28 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Horwitz",
"L. P.",
""
]
] |
A brief summary of the mathematical structure of the Lee-Friedrichs model is given, including the natural extension of its Hamiltonian to a Gel'fand triple, containing a generalized eigenstate for the complex pole. Contains references to some physical applications and relativistic generalizations.
|
1312.5330
|
Gabriele Ferretti
|
Gabriele Ferretti and Denis Karateev
|
Fermionic UV completions of Composite Higgs models
|
15 pages, 4 tables; V2 Comments and references added. To appear in
JHEP. V3 Coset of type $SU(4)\times SU(4)'/SU(4)_D$ added to the
classification
| null |
10.1007/JHEP03(2014)077
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We classify the four-dimensional purely fermionic gauge theories that give a
UV completion of composite Higgs models. Our analysis is at the group
theoretical level, addressing the necessary (but not sufficient) conditions for
the viability of these models, such as the existence of top partners and
custodial symmetry. The minimal cosets arising are those of type SU(5)/SO(5)
and SU(4)/Sp(4). We list all the possible "hyper-color" groups allowed and
point out the simplest and most promising ones.
|
[
{
"created": "Wed, 18 Dec 2013 21:00:13 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2014 12:46:00 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Jan 2016 13:40:19 GMT",
"version": "v3"
}
] |
2016-01-05
|
[
[
"Ferretti",
"Gabriele",
""
],
[
"Karateev",
"Denis",
""
]
] |
We classify the four-dimensional purely fermionic gauge theories that give a UV completion of composite Higgs models. Our analysis is at the group theoretical level, addressing the necessary (but not sufficient) conditions for the viability of these models, such as the existence of top partners and custodial symmetry. The minimal cosets arising are those of type SU(5)/SO(5) and SU(4)/Sp(4). We list all the possible "hyper-color" groups allowed and point out the simplest and most promising ones.
|
hep-ph/9208252
| null |
W. Broniowski and T. D. Cohen
|
The structure of the pion and effective electroweak currents in soliton
models of the nucleon
|
9 pages, report DOE/ER/40322-170, U. of MD PP \#93-001, (uses RevTeX)
|
Phys.Rev.D48:2299-2303,1993
|
10.1103/PhysRevD.48.2299
| null |
hep-ph
| null |
Nonminimal substitution terms in electroweak currents are studied in
effective chiral soliton models. It is found that the terms describing the
structure of the pion lead to sizable effects in form factors and
polarizabilities of the nucleon.
|
[
{
"created": "Wed, 26 Aug 1992 16:30:47 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Broniowski",
"W.",
""
],
[
"Cohen",
"T. D.",
""
]
] |
Nonminimal substitution terms in electroweak currents are studied in effective chiral soliton models. It is found that the terms describing the structure of the pion lead to sizable effects in form factors and polarizabilities of the nucleon.
|
1103.0452
|
Tri-Nang Pham
|
T. N. Pham and X. Y. Pham
|
Chiral anomaly, triangle loop and the the $\gamma\gamma^{*}\to \pi^{0}$
form factor
|
v2,9 pages, 1 figure included in pdf file, references added
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent BaBar measurements of the $\gamma\gamma^{*}\to \pi^{0}$ form
factor show spectacular deviation from perturbative QCD computations for large
space-like $Q^{2}$. At $34\,\rm GeV^{2}$ the data are more than 50% larger than
theoretical predictions. Stimulated by these new experimental results, we
revisit our previous paper on triangle loop effects related to chiral anomaly,
and apply our method to the $\gamma + \gamma^* \to \pi^0$ form factor measured
in the single tag mode $e^{+} + e^{-}\to e^{+} + e^{-} + \pi^{0}$ with one
highly virtual photon. The resultant form factor $F(Q^{2})$ - which depends on
only one parameter (the mass $m$ of up, down quark circulating in the triangle
loop) behaves like $(\frac{m^{2}}{Q^{2}})\times (\ln(Q^{2}/m^{2}))^{2}$ - shows
a striking agreement with BaBar data for $m \approx 132\,\rm MeV$. The rising
logarithm squared form factor, surprisingly unnoticed in the literature, is in
sharp contrast with the rather flat ones derived from perturbative QCD
approaches.
|
[
{
"created": "Wed, 2 Mar 2011 15:14:05 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2011 15:50:31 GMT",
"version": "v2"
}
] |
2011-03-07
|
[
[
"Pham",
"T. N.",
""
],
[
"Pham",
"X. Y.",
""
]
] |
The recent BaBar measurements of the $\gamma\gamma^{*}\to \pi^{0}$ form factor show spectacular deviation from perturbative QCD computations for large space-like $Q^{2}$. At $34\,\rm GeV^{2}$ the data are more than 50% larger than theoretical predictions. Stimulated by these new experimental results, we revisit our previous paper on triangle loop effects related to chiral anomaly, and apply our method to the $\gamma + \gamma^* \to \pi^0$ form factor measured in the single tag mode $e^{+} + e^{-}\to e^{+} + e^{-} + \pi^{0}$ with one highly virtual photon. The resultant form factor $F(Q^{2})$ - which depends on only one parameter (the mass $m$ of up, down quark circulating in the triangle loop) behaves like $(\frac{m^{2}}{Q^{2}})\times (\ln(Q^{2}/m^{2}))^{2}$ - shows a striking agreement with BaBar data for $m \approx 132\,\rm MeV$. The rising logarithm squared form factor, surprisingly unnoticed in the literature, is in sharp contrast with the rather flat ones derived from perturbative QCD approaches.
|
1512.05241
|
Mario Mitter
|
Markus Heller and Mario Mitter
|
Pion and $\eta$-meson mass splitting at the two-flavour chiral crossover
| null |
Phys. Rev. D 94, 074002 (2016)
|
10.1103/PhysRevD.94.074002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the splitting in the screening mass of pions and the $\eta$-meson
across the chiral crossover. This splitting is determined by the 't Hooft
determinant. We use results for the renormalisation group scale dependence of
the 't Hooft determinant obtained within the functional renomalisation group in
quenched QCD with two flavours. The scale dependence of the 't Hooft
determinant is mapped to its temperature dependence with the help of a
Polyakov-quark-meson model. As a result we obtain the temperature dependence of
the splitting in the screening mass of pions and the $\eta$-meson.
|
[
{
"created": "Wed, 16 Dec 2015 16:50:34 GMT",
"version": "v1"
}
] |
2016-10-12
|
[
[
"Heller",
"Markus",
""
],
[
"Mitter",
"Mario",
""
]
] |
We study the splitting in the screening mass of pions and the $\eta$-meson across the chiral crossover. This splitting is determined by the 't Hooft determinant. We use results for the renormalisation group scale dependence of the 't Hooft determinant obtained within the functional renomalisation group in quenched QCD with two flavours. The scale dependence of the 't Hooft determinant is mapped to its temperature dependence with the help of a Polyakov-quark-meson model. As a result we obtain the temperature dependence of the splitting in the screening mass of pions and the $\eta$-meson.
|
hep-ph/9509245
|
Frank Close
|
Frank Close
|
Are Glueballs and Hybrids Found?
|
Style file sprocl.sty required (available from hep-ph). No figs. To
appear in Proc. of Hadron95
| null | null |
RAL-TR-95-045
|
hep-ph
| null |
The lightest scalar glueball and ground state hybrids may have been found. I
compare signals reported at this conference with theoretical expectations and
highlight the questions that need to be addressed in forthcoming experiments.
|
[
{
"created": "Thu, 7 Sep 1995 11:11:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Close",
"Frank",
""
]
] |
The lightest scalar glueball and ground state hybrids may have been found. I compare signals reported at this conference with theoretical expectations and highlight the questions that need to be addressed in forthcoming experiments.
|
2105.08674
|
Silvano Simula
|
G. Martinelli, S. Simula, L. Vittorio
|
$\vert V_{cb} \vert$ and $R(D^{(*)})$ using lattice QCD and unitarity
|
48 pages, 15 figures, 6 tables. Matches the published version in PRD
| null |
10.1103/PhysRevD.105.034503
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Cabibbo-Kobayashi-Maskawa (CKM) matrix element $|V_{cb}|$ is extracted
from exclusive semileptonic $B \to D^{(*)}$ decays adopting a novel
unitarity-based approach which allows to determine in a full non-perturbative
way the relevant hadronic form factors (FFs) in the whole kinematical range. By
using existing lattice computations of the $B \to D^{(*)}$ FFs at small recoil
from FNAL/MILC and JLQCD Collaborations, we show that it is possible to
extrapolate their behavior also at large recoil without assuming any specific
momentum dependence and without constraining their shape using experimental
data. Thus, we address the extraction of $|V_{cb}|$ from the experimental data
on the semileptonic $B \to D^{(*)} \ell \nu_\ell$ decays, obtaining $\vert
V_{cb}\vert = (41.0 \pm 1.2 ) \cdot 10^{-3}$ from $B \to D$ using as input the
final FNAL/MILC lattice data for the FFs and $|V_{cb}| = (40.4 \pm 1.8 ) \cdot
10^{-3}$ from $B \to D^*$ using the preliminary JLQCD lattice data. Our result
from $B \to D$ is consistent within $\sim 1$ standard deviation with the most
recent inclusive determination $|V_{cb}|_{incl} = (42.00 \pm 0.65) \cdot
10^{-3}$. The resulting uncertainty is comparable with those obtained in
literature using experimental data to constrain the shape of the FFs. Our
result from $B \to D^*$, though consistent with $|V_{cb}|_{incl} $, is still
based on preliminary lattice data for the FFs and its uncertainty is greater
than the ones obtained in literature using experimental data to constrain the
shape of the FFs. We investigate also the issue of Lepton Flavor Universality
thanks to new theoretical estimates of the ratios $R(D^{(*)})$, namely $R(D) =
0.296(8)$ using final FNAL/MILC lattice results, and $R(D^{*}) = 0.261(20)$
using preliminary JLQCD and FNAL/MILC lattice data. Our findings differ by
$\sim 1.4\sigma$ from the latest experimental determinations.
|
[
{
"created": "Tue, 18 May 2021 17:05:15 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Dec 2021 03:56:14 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Feb 2022 17:22:32 GMT",
"version": "v3"
}
] |
2022-02-16
|
[
[
"Martinelli",
"G.",
""
],
[
"Simula",
"S.",
""
],
[
"Vittorio",
"L.",
""
]
] |
The Cabibbo-Kobayashi-Maskawa (CKM) matrix element $|V_{cb}|$ is extracted from exclusive semileptonic $B \to D^{(*)}$ decays adopting a novel unitarity-based approach which allows to determine in a full non-perturbative way the relevant hadronic form factors (FFs) in the whole kinematical range. By using existing lattice computations of the $B \to D^{(*)}$ FFs at small recoil from FNAL/MILC and JLQCD Collaborations, we show that it is possible to extrapolate their behavior also at large recoil without assuming any specific momentum dependence and without constraining their shape using experimental data. Thus, we address the extraction of $|V_{cb}|$ from the experimental data on the semileptonic $B \to D^{(*)} \ell \nu_\ell$ decays, obtaining $\vert V_{cb}\vert = (41.0 \pm 1.2 ) \cdot 10^{-3}$ from $B \to D$ using as input the final FNAL/MILC lattice data for the FFs and $|V_{cb}| = (40.4 \pm 1.8 ) \cdot 10^{-3}$ from $B \to D^*$ using the preliminary JLQCD lattice data. Our result from $B \to D$ is consistent within $\sim 1$ standard deviation with the most recent inclusive determination $|V_{cb}|_{incl} = (42.00 \pm 0.65) \cdot 10^{-3}$. The resulting uncertainty is comparable with those obtained in literature using experimental data to constrain the shape of the FFs. Our result from $B \to D^*$, though consistent with $|V_{cb}|_{incl} $, is still based on preliminary lattice data for the FFs and its uncertainty is greater than the ones obtained in literature using experimental data to constrain the shape of the FFs. We investigate also the issue of Lepton Flavor Universality thanks to new theoretical estimates of the ratios $R(D^{(*)})$, namely $R(D) = 0.296(8)$ using final FNAL/MILC lattice results, and $R(D^{*}) = 0.261(20)$ using preliminary JLQCD and FNAL/MILC lattice data. Our findings differ by $\sim 1.4\sigma$ from the latest experimental determinations.
|
hep-ph/0409101
|
Atsushi Hosaka
|
A. Hosaka
|
Structure and production of Theta+
|
4 pages, Proceedings for the YITP Workshop on Multi-quark Hadrons:
Four, Five and More? (YITP-W-03-21), Kyoto, Japan, 17-19 Feb 2004
| null | null | null |
hep-ph
| null |
We study properties of the pentaquark particle Theta+ with emphasis on the
role of chiral symmetry.
It is shown that when chiral force is sufficiently strong, the positive
parity Theta+ may be realized with a lower mass relative to the negative parity
state.
The decay width is then studied in the non-relativistic quark model.
It is shown that the narrow width may be realized for the positive parity
state, while the seemingly lowest negative parity state couples strongly to the
continuum state resulting in a very broad width.
Finally, Theta+ production is studied in photo-induced and proton-induced
processes.
The polarized proton reaction provides a model independent method to
determine the parity of Theta+.
|
[
{
"created": "Thu, 9 Sep 2004 03:15:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hosaka",
"A.",
""
]
] |
We study properties of the pentaquark particle Theta+ with emphasis on the role of chiral symmetry. It is shown that when chiral force is sufficiently strong, the positive parity Theta+ may be realized with a lower mass relative to the negative parity state. The decay width is then studied in the non-relativistic quark model. It is shown that the narrow width may be realized for the positive parity state, while the seemingly lowest negative parity state couples strongly to the continuum state resulting in a very broad width. Finally, Theta+ production is studied in photo-induced and proton-induced processes. The polarized proton reaction provides a model independent method to determine the parity of Theta+.
|
hep-ph/9806296
|
Wo. Schaefer
|
W. Schaefer (IKP, FZ-Juelich)
|
The Impact of NLO-Corrections on the Determination of the
$\bar{u},\bar{d} Content of Nucleons from Drell-Yan Production
|
4 pages, 1 eps-figure. To be published in Proceedings of DIS'98
|
Phys. Rev. D 59, 115002 (1999)
|
10.1103/PhysRevD.59.115002
| null |
hep-ph
| null |
The interpretation of Drell-Yan production in terms of the antiquark
densities depends on NLO corrections. Besides the NLO corrections to the
familiar annihilation $q\bar{q}\to \gamma^* \to l^+ l^-$, there is a
substantial contribution from the QCD Compton subprocesses $gq \to q\gamma^*
\to q l^+ l^-$ and $g\bar{q} \to q\gamma^* \to q l^+ l^-$. The beam and target
dependence of the two classes of corrections is different. We discuss the
impact of this difference on the determination of the $\bar{d}-\bar{u}$
asymmetry in the proton from the comparison of the $pp$ and $pn$ Drell-Yan
production.
|
[
{
"created": "Sat, 6 Jun 1998 15:00:06 GMT",
"version": "v1"
}
] |
2016-08-25
|
[
[
"Schaefer",
"W.",
"",
"IKP, FZ-Juelich"
]
] |
The interpretation of Drell-Yan production in terms of the antiquark densities depends on NLO corrections. Besides the NLO corrections to the familiar annihilation $q\bar{q}\to \gamma^* \to l^+ l^-$, there is a substantial contribution from the QCD Compton subprocesses $gq \to q\gamma^* \to q l^+ l^-$ and $g\bar{q} \to q\gamma^* \to q l^+ l^-$. The beam and target dependence of the two classes of corrections is different. We discuss the impact of this difference on the determination of the $\bar{d}-\bar{u}$ asymmetry in the proton from the comparison of the $pp$ and $pn$ Drell-Yan production.
|
0902.4283
|
Tomohiro Matsuda
|
Tomohiro Matsuda
|
Cosmological perturbations from an inhomogeneous phase transition
|
18 pages, 3 figures, minor changes, accepted for publication in CQG
|
Class.Quant.Grav.26:145011,2009
|
10.1088/0264-9381/26/14/145011
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A mechanism for generating metric perturbations in inflationary models is
considered. Long-wavelength inhomogeneities of light scalar fields in a
decoupled sector may give rise to superhorizon fluctuations of couplings and
masses in the low-energy effective action. Cosmological phase transitions may
then occur that are not simultaneous in space, but occur with time lags in
different Hubble patches that arise from the long-wavelength inhomogeneities.
Here an interesting model in which cosmological perturbations may be created at
the electroweak phase transition is considered. The results show that phase
transitions may be a generic source of non-Gaussianity.
|
[
{
"created": "Wed, 25 Feb 2009 04:50:08 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2009 05:27:28 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Apr 2009 07:38:27 GMT",
"version": "v3"
}
] |
2009-07-24
|
[
[
"Matsuda",
"Tomohiro",
""
]
] |
A mechanism for generating metric perturbations in inflationary models is considered. Long-wavelength inhomogeneities of light scalar fields in a decoupled sector may give rise to superhorizon fluctuations of couplings and masses in the low-energy effective action. Cosmological phase transitions may then occur that are not simultaneous in space, but occur with time lags in different Hubble patches that arise from the long-wavelength inhomogeneities. Here an interesting model in which cosmological perturbations may be created at the electroweak phase transition is considered. The results show that phase transitions may be a generic source of non-Gaussianity.
|
hep-ph/9708252
|
Isi Dunietz
|
Isard Dunietz (Fermilab)
|
Enhanced Charmless Yield in B Decays and Inclusive B-Decay Puzzles
|
latex 10 pages, 3 ps figures included, to appear in the proceedings
of the second international conference on B physics and CP violation,
Honolulu, Hawaii, 24 - 27 March 1997
| null |
10.1142/9789814503952_0011
|
FERMILAB-CONF-97/230-T
|
hep-ph
| null |
Our analysis suggests that the charmless yield in B decays is enhanced over
traditional estimates. The c c.bar pair produced in b to c c.bar transitions
may be seen significantly as light hadrons due to non-perturbative effects.
Existing data samples at Upsilon(4S) and Z^0 factories allow key measurements
which are outlined.
|
[
{
"created": "Tue, 5 Aug 1997 19:39:06 GMT",
"version": "v1"
}
] |
2016-11-03
|
[
[
"Dunietz",
"Isard",
"",
"Fermilab"
]
] |
Our analysis suggests that the charmless yield in B decays is enhanced over traditional estimates. The c c.bar pair produced in b to c c.bar transitions may be seen significantly as light hadrons due to non-perturbative effects. Existing data samples at Upsilon(4S) and Z^0 factories allow key measurements which are outlined.
|
hep-ph/9411437
|
Schlei Bernd
|
I.V. Andreev, M. Pl\"umer, B.R. Schlei and R.M. Weiner
|
Change with energy of source geometry as seen in hadron interferometry
|
12 pages
| null | null |
DMR-THEP-94-9/W
|
hep-ph
| null |
The variation of radii, lifetimes, correlation lengths and the chaoticity
parameter of particle sources with the collision energy $\sqrt{s}$ is studied
by analysing and comparing two-particle Bose-Einstein correlation data obtained
by the NA22 Collaboration at $\sqrt{s}=22\ GeV$ and by the UA1-Minimum-Bias
Collaboration at $\sqrt{s}=630\ GeV$. The UA1-data are found to be inconsistent
with a static source, whereas both the data at $\sqrt{s}=22\ GeV$ and at $630\
GeV$ can be described in an expanding source model. In the latter model, the
$s$-dependence of the data implies an increase of the transverse radius with
$s$ and a decrease of the correlation lengths in longitudinal and in transverse
direction. The chaoticity parameter increases or remains approximately constant
as a function of the CM energy.
|
[
{
"created": "Wed, 30 Nov 1994 11:19:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Andreev",
"I. V.",
""
],
[
"Plümer",
"M.",
""
],
[
"Schlei",
"B. R.",
""
],
[
"Weiner",
"R. M.",
""
]
] |
The variation of radii, lifetimes, correlation lengths and the chaoticity parameter of particle sources with the collision energy $\sqrt{s}$ is studied by analysing and comparing two-particle Bose-Einstein correlation data obtained by the NA22 Collaboration at $\sqrt{s}=22\ GeV$ and by the UA1-Minimum-Bias Collaboration at $\sqrt{s}=630\ GeV$. The UA1-data are found to be inconsistent with a static source, whereas both the data at $\sqrt{s}=22\ GeV$ and at $630\ GeV$ can be described in an expanding source model. In the latter model, the $s$-dependence of the data implies an increase of the transverse radius with $s$ and a decrease of the correlation lengths in longitudinal and in transverse direction. The chaoticity parameter increases or remains approximately constant as a function of the CM energy.
|
1501.02610
|
Dipankar Das
|
Dipankar Das
|
New limits on $\mathbf{\tan\beta}$ for 2HDMs with $\mathbf{Z_2}$
symmetry
|
Version accepted in Int J of Mod Phys A
| null |
10.1142/S0217751X15501584
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In two-Higgs-doublet models with exact $Z_2$ symmetry, putting $m_h \simeq
125$ GeV at the alignment limit, the following limits on the heavy scalar
masses are obtained from the conditions of unitarity and stability of the
scalar potential: $m_H,~m_A,~m_{H^+} < 1$ TeV and $1/8 <\tan\beta <8$. The
constraints from $b \to s \gamma$ and neutral meson mass differences, when
superimposed on the unitarity constraints, put a tighter lower limit on
$\tan\beta$ depending on $m_{H^+}$. It has also been shown that larger values
of $\tan\beta$ can be allowed by introducing soft breaking term in the
potential at the expense of a correlation between $m_H$ and the soft breaking
parameter.
|
[
{
"created": "Mon, 12 Jan 2015 11:47:31 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 2015 11:34:41 GMT",
"version": "v2"
}
] |
2015-09-30
|
[
[
"Das",
"Dipankar",
""
]
] |
In two-Higgs-doublet models with exact $Z_2$ symmetry, putting $m_h \simeq 125$ GeV at the alignment limit, the following limits on the heavy scalar masses are obtained from the conditions of unitarity and stability of the scalar potential: $m_H,~m_A,~m_{H^+} < 1$ TeV and $1/8 <\tan\beta <8$. The constraints from $b \to s \gamma$ and neutral meson mass differences, when superimposed on the unitarity constraints, put a tighter lower limit on $\tan\beta$ depending on $m_{H^+}$. It has also been shown that larger values of $\tan\beta$ can be allowed by introducing soft breaking term in the potential at the expense of a correlation between $m_H$ and the soft breaking parameter.
|
2308.15508
|
Shi Yin
|
Wei-jie Fu, Xiaofeng Luo, Jan M. Pawlowski, Fabian Rennecke, Shi Yin
|
Ripples of the QCD Critical Point
|
v2: 7+11 pages, 15 figures, 2 tables. Discussions on Polyakov loop
potential (S.1.1) and the state-of-the-art estimates and predictions of CEP
(S.2) with three further figures are added
| null | null | null |
hep-ph nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the impact of a critical end point (CEP) on the experimentally
accessible baryon number fluctuations of different orders. By now, its
potential location has been constrained fairly accurately within first
principles functional QCD, together with the location of the chiral crossover
line and further thermodynamic observables. This information is incorporated in
an advanced QCD-assisted low energy effective theory which is used for the
computation of baryon number fluctuations at the chemical freeze-out. This
computation also takes care of global baryon number conservation at larger
density, where the system changes from grand-canonical to canonical statistics.
We observe a prominent peak structure, whose amplitude depends on the location
of the CEP, while its position is more sensitive to the location of the
freeze-out curve. Our results provide guidance for future low energy heavy-ion
experiments.
|
[
{
"created": "Tue, 29 Aug 2023 13:40:21 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2024 03:19:34 GMT",
"version": "v2"
}
] |
2024-05-14
|
[
[
"Fu",
"Wei-jie",
""
],
[
"Luo",
"Xiaofeng",
""
],
[
"Pawlowski",
"Jan M.",
""
],
[
"Rennecke",
"Fabian",
""
],
[
"Yin",
"Shi",
""
]
] |
We investigate the impact of a critical end point (CEP) on the experimentally accessible baryon number fluctuations of different orders. By now, its potential location has been constrained fairly accurately within first principles functional QCD, together with the location of the chiral crossover line and further thermodynamic observables. This information is incorporated in an advanced QCD-assisted low energy effective theory which is used for the computation of baryon number fluctuations at the chemical freeze-out. This computation also takes care of global baryon number conservation at larger density, where the system changes from grand-canonical to canonical statistics. We observe a prominent peak structure, whose amplitude depends on the location of the CEP, while its position is more sensitive to the location of the freeze-out curve. Our results provide guidance for future low energy heavy-ion experiments.
|
hep-ph/0608030
|
Utpal Sarkar
|
Utpal Sarkar and Santosh K. Singh
|
CP violation in neutrino mass matrix
|
19 pages
|
Nucl.Phys.B771:28-39,2007
|
10.1016/j.nuclphysb.2007.02.009
| null |
hep-ph
| null |
We constructed rephasing invariant measures of CP violation with elements of
the neutrino mass matrix, in the basis in which the charged lepton mass matrix
is diagonal. We discuss some examples of neutrino mass matrices with texture
zeroes, where the present approach is applicable and demonstrate how it
simplifies an analysis of CP violation. We applied our approach to study CP
violation in all the phenomenologically acceptable 3-generation two-zero
texture neutrino mass matrices and shown that in any of these cases there is
only one CP phase which contributes to the neutrino oscillation experiment and
there are no Majorana phases.
|
[
{
"created": "Thu, 3 Aug 2006 09:53:48 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Sarkar",
"Utpal",
""
],
[
"Singh",
"Santosh K.",
""
]
] |
We constructed rephasing invariant measures of CP violation with elements of the neutrino mass matrix, in the basis in which the charged lepton mass matrix is diagonal. We discuss some examples of neutrino mass matrices with texture zeroes, where the present approach is applicable and demonstrate how it simplifies an analysis of CP violation. We applied our approach to study CP violation in all the phenomenologically acceptable 3-generation two-zero texture neutrino mass matrices and shown that in any of these cases there is only one CP phase which contributes to the neutrino oscillation experiment and there are no Majorana phases.
|
1906.04880
|
Hao Sun
|
Hao Sun, Tichouk and Xuan Luo
|
Probing the Sivers asymmetries through $\rm J/\psi$ photoproduction in
$\rm p^\uparrow p$ collision with forward proton tagging
| null |
Phys. Rev. D 100, 014007 (2019)
|
10.1103/PhysRevD.100.014007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we probe the Sivers asymmetries through $\rm J/\psi$
photoproduction in $\rm p^\uparrow p$ collision within the non-relativistic QCD
framework, based on color octet model and the Transverse Momentum Dependent
Parton Distributions (TMDs). Both the DGLAP evolution and the TMD evolution are
included. The intensity and the sign of the Sivers asymmetry is strongly
related on evolution model used to investigate the Gluon Sivers Function (GSF).
A sizable asymmetry is obtained as a function of the rapidity, $\rm
log{(x_{\gamma})}$ or $\rm log{(x_{g})}$ dependence using a recent
parametrization of GSF at the RHIC and AFTER@LHC experiments with the LHC
planned forward detector acceptances.
|
[
{
"created": "Wed, 12 Jun 2019 01:43:59 GMT",
"version": "v1"
}
] |
2019-07-17
|
[
[
"Sun",
"Hao",
""
],
[
"Tichouk",
"",
""
],
[
"Luo",
"Xuan",
""
]
] |
In this paper we probe the Sivers asymmetries through $\rm J/\psi$ photoproduction in $\rm p^\uparrow p$ collision within the non-relativistic QCD framework, based on color octet model and the Transverse Momentum Dependent Parton Distributions (TMDs). Both the DGLAP evolution and the TMD evolution are included. The intensity and the sign of the Sivers asymmetry is strongly related on evolution model used to investigate the Gluon Sivers Function (GSF). A sizable asymmetry is obtained as a function of the rapidity, $\rm log{(x_{\gamma})}$ or $\rm log{(x_{g})}$ dependence using a recent parametrization of GSF at the RHIC and AFTER@LHC experiments with the LHC planned forward detector acceptances.
|
hep-ph/9609292
|
Erhard Seiler
|
A. Patrascioiu, E. Seiler
|
The Problem of Asymptotic Freedom
|
Paper presented at ICHEP'96 in Warsaw, 9 pages
| null | null |
MPI-PhT 96-86
|
hep-ph hep-lat hep-th
| null |
There is a growing body of evidence that the running of $\alpha_s$ predicted
by perturbation (PT) theory is not correctly describing the accelerator
experiments at the highest energies. A natural explanation is provided by the
authors' 1992 proposal that in fact the true running predicted by the
nonperturbatively defined lattice QCD is different, leading to an ultraviolet
fixed point near $\alpha_s=.1$. It is explained how this can be understood from
the fact that the conventional perturbative method is ambiguous and does not
provide the correct asymptotic expansion. It is pointed out that there is a
large amount of lattice data that are supporting this scenario rather than the
conventional one.
|
[
{
"created": "Mon, 9 Sep 1996 13:10:55 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Patrascioiu",
"A.",
""
],
[
"Seiler",
"E.",
""
]
] |
There is a growing body of evidence that the running of $\alpha_s$ predicted by perturbation (PT) theory is not correctly describing the accelerator experiments at the highest energies. A natural explanation is provided by the authors' 1992 proposal that in fact the true running predicted by the nonperturbatively defined lattice QCD is different, leading to an ultraviolet fixed point near $\alpha_s=.1$. It is explained how this can be understood from the fact that the conventional perturbative method is ambiguous and does not provide the correct asymptotic expansion. It is pointed out that there is a large amount of lattice data that are supporting this scenario rather than the conventional one.
|
2102.00003
|
Dani\"el Boer
|
Dani\"el Boer, Cristian Pisano, Pieter Taels
|
Extracting color octet NRQCD matrix elements from $J/\psi$ production at
the EIC
|
10 pages, 9 figures; some small additions to the text, corrections to
eqs. 37-38, conclusions unchanged, matches version accepted by Physical
Review D
|
Phys. Rev. D 103, 074012 (2021)
|
10.1103/PhysRevD.103.074012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently unpolarized and polarized $J/\psi \,(\Upsilon)$ production at the
Electron-Ion Collider (EIC) has been proposed as a new way to extract two
poorly known color-octet NRQCD long-distance matrix elements:
$\langle0\vert{\cal O}_{8}^{J/\psi}(^{1}S_{0})\vert0\rangle$ and
$\langle0\vert{\cal O}_{8}^{J/\psi}(^{3}P_{0})\vert0\rangle$. The proposed
method is based on a comparison to open heavy-quark pair production ideally
performed at the same kinematics. In this paper we analyze this proposal in
more detail and provide predictions for the EIC based on the available
determinations of the color-octet matrix elements. We also propose two
additional methods that do not require comparison to open heavy-quark pair
production.
|
[
{
"created": "Fri, 29 Jan 2021 15:53:34 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Mar 2021 18:33:18 GMT",
"version": "v2"
}
] |
2021-04-21
|
[
[
"Boer",
"Daniël",
""
],
[
"Pisano",
"Cristian",
""
],
[
"Taels",
"Pieter",
""
]
] |
Recently unpolarized and polarized $J/\psi \,(\Upsilon)$ production at the Electron-Ion Collider (EIC) has been proposed as a new way to extract two poorly known color-octet NRQCD long-distance matrix elements: $\langle0\vert{\cal O}_{8}^{J/\psi}(^{1}S_{0})\vert0\rangle$ and $\langle0\vert{\cal O}_{8}^{J/\psi}(^{3}P_{0})\vert0\rangle$. The proposed method is based on a comparison to open heavy-quark pair production ideally performed at the same kinematics. In this paper we analyze this proposal in more detail and provide predictions for the EIC based on the available determinations of the color-octet matrix elements. We also propose two additional methods that do not require comparison to open heavy-quark pair production.
|
hep-ph/9711485
|
Piet Mulders
|
D. Boer (NIKHEF) and P.J. Mulders (NIKHEF/Free University)
|
Time-reversal odd distribution functions in leptoproduction
|
8 pages RevTex, 1 figure using epsfig.sty
|
Phys.Rev.D57:5780-5786,1998
|
10.1103/PhysRevD.57.5780
|
NIKHEF 97-049, VUTH 97-20
|
hep-ph
| null |
We consider the various asymmetries, notably single spin asymmetries, that
appear in leptoproduction as a consequence of the presence of time-reversal odd
distribution functions. This could facilitate experimental searches for
time-reversal odd phenomena.
|
[
{
"created": "Wed, 26 Nov 1997 15:38:46 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Boer",
"D.",
"",
"NIKHEF"
],
[
"Mulders",
"P. J.",
"",
"NIKHEF/Free University"
]
] |
We consider the various asymmetries, notably single spin asymmetries, that appear in leptoproduction as a consequence of the presence of time-reversal odd distribution functions. This could facilitate experimental searches for time-reversal odd phenomena.
|
1209.0436
|
Katerina Lipka
|
S. Alekhin, K. Daum, K. Lipka, S. Moch
|
Determination of the charm-quark mass in the MS-bar scheme using charm
production data from deep inelastic scattering at HERA
| null | null |
10.1016/j.physletb.2012.11.010
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determine the charm-quark mass mc(mc) in the MS-bar scheme using
measurements of charm production in deep-inelastic ep scattering at HERA in the
kinematic range of photon virtuality from 5 to 1000 GeV squared and Bjorken
scaling variable from 0.0001 to 0.5. The extraction of charm quark mass from
this process with space-like kinematics provides complementary information to
results from hadronic processes. The QCD analysis of the HERA data yields a
value of mc(mc) of 1.27 plus minus 0.05(exp) plus 0.06 minus 0.01(scale) GeV at
next-to-leading order and mc(mc) of 1.36 plus minus 0.04(exp) plus 0.04 minus
0.00 (scale) plus minus 0.1(theory) GeV at approximate next-to-next-to-leading
order. The results are consistent with and of comparable precision as the world
average.
|
[
{
"created": "Mon, 3 Sep 2012 19:10:51 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Alekhin",
"S.",
""
],
[
"Daum",
"K.",
""
],
[
"Lipka",
"K.",
""
],
[
"Moch",
"S.",
""
]
] |
We determine the charm-quark mass mc(mc) in the MS-bar scheme using measurements of charm production in deep-inelastic ep scattering at HERA in the kinematic range of photon virtuality from 5 to 1000 GeV squared and Bjorken scaling variable from 0.0001 to 0.5. The extraction of charm quark mass from this process with space-like kinematics provides complementary information to results from hadronic processes. The QCD analysis of the HERA data yields a value of mc(mc) of 1.27 plus minus 0.05(exp) plus 0.06 minus 0.01(scale) GeV at next-to-leading order and mc(mc) of 1.36 plus minus 0.04(exp) plus 0.04 minus 0.00 (scale) plus minus 0.1(theory) GeV at approximate next-to-next-to-leading order. The results are consistent with and of comparable precision as the world average.
|
hep-ph/9911259
| null |
Harry J. Lipkin (Weizmann Institute of Science, Tel Aviv University,
University of Connecticut)
|
The New $\sigma_{tot}(\Sigma p)$ Data, the new PDG fit to hadron total
cross sections and the TCP alternative
|
13 pages
| null | null |
TAUP 2600-99, WIS-99/34/Nov-DPP
|
hep-ph
| null |
The new SELEX measurement $\sigma_{tot}(\Sigma p) = 36.96 \pm 0.65$ at P =
609 GeV/c and the new 1998 Particle-Data-Group Regge (PDG) analysis of hadron
total cross sections with an additional even-signature-exchange contribution
recall the 1975 two-component-Pomeron model (TCP), which introduced such an
additional term and predicted $\sigma_{tot}(\Sigma p) = 37.07$ mb. in 1975 as
well as fitting all the same data now fit by PDG with fewer free parameters.and
predicting $\sigma_{tot}(\Sigma p)$, (not predicted by PDG) at lower energies.
The additional contribution confuses the extraction of the Pomeron intercept
from data in the 600 GeV range and its dynamical origin is still unclear. But
its surprising systematics suggests an interesting origin.
|
[
{
"created": "Fri, 5 Nov 1999 19:05:12 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lipkin",
"Harry J.",
"",
"Weizmann Institute of Science, Tel Aviv University,\n University of Connecticut"
]
] |
The new SELEX measurement $\sigma_{tot}(\Sigma p) = 36.96 \pm 0.65$ at P = 609 GeV/c and the new 1998 Particle-Data-Group Regge (PDG) analysis of hadron total cross sections with an additional even-signature-exchange contribution recall the 1975 two-component-Pomeron model (TCP), which introduced such an additional term and predicted $\sigma_{tot}(\Sigma p) = 37.07$ mb. in 1975 as well as fitting all the same data now fit by PDG with fewer free parameters.and predicting $\sigma_{tot}(\Sigma p)$, (not predicted by PDG) at lower energies. The additional contribution confuses the extraction of the Pomeron intercept from data in the 600 GeV range and its dynamical origin is still unclear. But its surprising systematics suggests an interesting origin.
|
hep-ph/0310365
|
J. D. Vergados
|
J.D. Vergados (T-6, Lanl), P.Quentin (T-Do, Lanl) and D. Strottman
(TDO, Lanl)
|
Direct detection of supersymmetric dark matter- Theoretical rates for
transitions to excited states
|
LaTex, 13 pages, 3 postscript figures, 1 table, to appear in IJMPE
|
Int.J.Mod.Phys. E14 (2005) 751
|
10.1142/S0218301305003508
| null |
hep-ph
| null |
The recent WMAP data have confirmed that exotic dark matter together with the
vacuum energy (cosmological constant) dominate in the flat Universe.
Supersymmetry provides a natural dark matter candidate, the lightest
supersymmetric particle (LSP). Thus the direct dark matter detection is central
to particle physics and cosmology. Most of the research on this issue has
hitherto focused on the detection of the recoiling nucleus. In this paper we
study transitions to the excited states, focusing on the first excited state at
50 keV of Iodine A=127. We find that the transition rate to this excited state
is about 10 percent of the transition to the ground state. So, in principle,
the extra signature of the gammai ray following its de-excitation can be
exploited experimentally.
|
[
{
"created": "Fri, 31 Oct 2003 14:54:07 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Oct 2004 20:08:30 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Vergados",
"J. D.",
"",
"T-6, Lanl"
],
[
"Quentin",
"P.",
"",
"T-Do, Lanl"
],
[
"Strottman",
"D.",
"",
"TDO, Lanl"
]
] |
The recent WMAP data have confirmed that exotic dark matter together with the vacuum energy (cosmological constant) dominate in the flat Universe. Supersymmetry provides a natural dark matter candidate, the lightest supersymmetric particle (LSP). Thus the direct dark matter detection is central to particle physics and cosmology. Most of the research on this issue has hitherto focused on the detection of the recoiling nucleus. In this paper we study transitions to the excited states, focusing on the first excited state at 50 keV of Iodine A=127. We find that the transition rate to this excited state is about 10 percent of the transition to the ground state. So, in principle, the extra signature of the gammai ray following its de-excitation can be exploited experimentally.
|
hep-ph/9911429
|
Gronau Michael
|
Michael Gronau
|
Electroweak penguin amplitudes and constraints on $\gamma$ in charmless
$B\to VP$ decays
|
19 pages, additional comments on factorization, to appear in Physical
Review D
| null |
10.1103/PhysRevD.62.014031
| null |
hep-ph
| null |
Electroweak penguin (EWP) amplitudes are studied model-independently in $B$
meson decays to charmless final states consisting of a vector meson ($V$) and a
pseudoscalar meson ($P$). A set of SU(3) relations is derived between EWP
contributions and tree amplitudes, in the approximation of retaining only the
dominant EWP operators $Q_9$ and $Q_{10}$ . Two applications are described for
constraining the weak phase $\gamma$, in $B^{\pm}\to \rho^{\pm} K^0$ and
$B^{\pm}\to \rho^0 K^{\pm}$ (or $B^{\pm}\to K^{*\pm}\pi^0$ and $B^{\pm}\to
K^{*0}\pi^{\pm}$), and in $B^0\to K^{*\pm}\pi^{\mp}$ and $B^{\pm}\to\phi
K^{\pm}$. Theoretical uncertainties are discussed.
|
[
{
"created": "Sun, 21 Nov 1999 17:08:16 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 1999 11:26:40 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Mar 2000 10:41:43 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Gronau",
"Michael",
""
]
] |
Electroweak penguin (EWP) amplitudes are studied model-independently in $B$ meson decays to charmless final states consisting of a vector meson ($V$) and a pseudoscalar meson ($P$). A set of SU(3) relations is derived between EWP contributions and tree amplitudes, in the approximation of retaining only the dominant EWP operators $Q_9$ and $Q_{10}$ . Two applications are described for constraining the weak phase $\gamma$, in $B^{\pm}\to \rho^{\pm} K^0$ and $B^{\pm}\to \rho^0 K^{\pm}$ (or $B^{\pm}\to K^{*\pm}\pi^0$ and $B^{\pm}\to K^{*0}\pi^{\pm}$), and in $B^0\to K^{*\pm}\pi^{\mp}$ and $B^{\pm}\to\phi K^{\pm}$. Theoretical uncertainties are discussed.
|
0705.4351
|
Wei Chao
|
Wei Chao
|
Neutrino Masses and Lepton-flavor-violating $\tau$ Decays in the
Supersymmetric Left-right Model
| null | null |
10.1088/1674-1137/35/3/002
| null |
hep-ph
| null |
In the supersymmetric left-right model, the light neutrino masses are given
by the Type-II seesaw mechanism. A duality property about this mechanism
indicates that there exist eight possible Higgs triplet Yukawa couplings which
result in the same neutrino mass matrix. In this paper, We work out the
one-loop renormalization group equations for the effective neutrino mass matrix
in the supersymmetric left-right model. The stability of the Type-II seesaw
scenario is briefly discussed. We also study the lepton-flavor-violating
processes ($\tau\to \mu\gamma$ and $\tau\to e\gamma$) by using the
reconstructed Higgs triplet Yukawa couplings.
|
[
{
"created": "Wed, 30 May 2007 08:32:48 GMT",
"version": "v1"
}
] |
2015-05-13
|
[
[
"Chao",
"Wei",
""
]
] |
In the supersymmetric left-right model, the light neutrino masses are given by the Type-II seesaw mechanism. A duality property about this mechanism indicates that there exist eight possible Higgs triplet Yukawa couplings which result in the same neutrino mass matrix. In this paper, We work out the one-loop renormalization group equations for the effective neutrino mass matrix in the supersymmetric left-right model. The stability of the Type-II seesaw scenario is briefly discussed. We also study the lepton-flavor-violating processes ($\tau\to \mu\gamma$ and $\tau\to e\gamma$) by using the reconstructed Higgs triplet Yukawa couplings.
|
1505.03479
|
Nosiphiwo Zwane Ms
|
Nosiphiwo Zwane
|
Long-Lived Particle Searches in R-Parity Violating MSSM
|
16 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we study the constraints on MSSM R-Parity violating decays when
the Lightest Superpartner (LSP) is moderately long lived. In this scenario the
LSP vertex displacement may be observed at the LHC. We compute limits on the
RPV Yukawa couplings for which the vertex displacement signature maybe used. We
then use ATLAS and CMS displaced vertex, meta-stable and prompt decay searches
to rule out a region of sparticle masses.
|
[
{
"created": "Wed, 13 May 2015 18:01:42 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2015 14:38:12 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Sep 2015 14:08:05 GMT",
"version": "v3"
}
] |
2015-09-16
|
[
[
"Zwane",
"Nosiphiwo",
""
]
] |
In this paper we study the constraints on MSSM R-Parity violating decays when the Lightest Superpartner (LSP) is moderately long lived. In this scenario the LSP vertex displacement may be observed at the LHC. We compute limits on the RPV Yukawa couplings for which the vertex displacement signature maybe used. We then use ATLAS and CMS displaced vertex, meta-stable and prompt decay searches to rule out a region of sparticle masses.
|
2011.10922
|
Bo Wang
|
Bo Wang, Lu Meng, Shi-Lin Zhu
|
Decoding the nature of $Z_{cs}(3985)$ and establishing the spectrum of
charged heavy quarkoniumlike states in chiral effective field theory
|
5 pages, 3 figures and 1 table
|
Phys. Rev. D 103, 021501 (2021)
|
10.1103/PhysRevD.103.L021501
| null |
hep-ph hep-ex hep-lat nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study the newly observed charmoniumlike state $Z_{cs}(3985)$ in the
framework of chiral effective field theory. The interaction kernel of the
$\bar{D}_sD^\ast/\bar{D}^\ast_sD$ system is calculated up to the
next-to-leading order with the explicit chiral dynamics. With the fitted
parameters extracted from the $Z_c(3900)$ data as inputs, the mass, width and
event distributions of the $Z_{cs}(3985)$ are very consistent with the
experimental measurements. Our studies strongly support the $Z_{cs}(3985)$ as
the partner of the $Z_c(3900)$ in the SU(3)$_f$ symmetry and the
$\bar{D}_sD^\ast/\bar{D}^\ast_sD$ molecular resonance with the same dynamical
origin as the other charged heavy quarkoniumlike states. We precisely predict
the resonance parameters of the unobserved states in $\bar{D}_s^\ast D^\ast$,
$B^\ast_s \bar{B}/B_s\bar{B}^\ast$ and $B_s^\ast\bar{B}^\ast$ systems, and
establish a complete spectrum of the charged charmoniumlike and bottomoniumlike
states with the $I(J^P)$ quantum numbers $1(1^+)$ and $\frac{1}{2}(1^+)$,
respectively.
|
[
{
"created": "Sun, 22 Nov 2020 03:35:23 GMT",
"version": "v1"
}
] |
2021-03-04
|
[
[
"Wang",
"Bo",
""
],
[
"Meng",
"Lu",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
We study the newly observed charmoniumlike state $Z_{cs}(3985)$ in the framework of chiral effective field theory. The interaction kernel of the $\bar{D}_sD^\ast/\bar{D}^\ast_sD$ system is calculated up to the next-to-leading order with the explicit chiral dynamics. With the fitted parameters extracted from the $Z_c(3900)$ data as inputs, the mass, width and event distributions of the $Z_{cs}(3985)$ are very consistent with the experimental measurements. Our studies strongly support the $Z_{cs}(3985)$ as the partner of the $Z_c(3900)$ in the SU(3)$_f$ symmetry and the $\bar{D}_sD^\ast/\bar{D}^\ast_sD$ molecular resonance with the same dynamical origin as the other charged heavy quarkoniumlike states. We precisely predict the resonance parameters of the unobserved states in $\bar{D}_s^\ast D^\ast$, $B^\ast_s \bar{B}/B_s\bar{B}^\ast$ and $B_s^\ast\bar{B}^\ast$ systems, and establish a complete spectrum of the charged charmoniumlike and bottomoniumlike states with the $I(J^P)$ quantum numbers $1(1^+)$ and $\frac{1}{2}(1^+)$, respectively.
|
1811.05999
|
Yuhsin Tsai
|
Yuhsin Tsai, Tao Xu, Hai-Bo Yu
|
Displaced Lepton Jet Signatures from Self-Interacting Dark Matter Bound
States
|
17 pages, 5 figures; v2: include discussions of di-muon pair searches
and the dark FSR process, match the published JHEP version
| null |
10.1007/JHEP08(2019)131
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study self-interacting dark matter signatures at the Large Hadron
Collider. A light dark photon, mediating dark matter self-interactions, can
bind dark matter particles to form a bound state when they are produced via a
heavy pseduoscalar in $pp$ collisions. The bound state can further annihilate
into a pair of boosted dark photons, which subsequently decay into charged
leptons through a kinetic mixing portal, resulting in striking displaced lepton
jet signals. After adapting the analysis used in the ATLAS experiment, we
explore the reach of the model parameters at the $13~{\rm TeV}$ run with an
integrated luminosity of $300~{\rm fb^{-1}}$. For heavy dark matter, the
displaced lepton jet searches can surpass traditional monojet signals in
setting the lower bound on the pseduoscalar mass. If a positive signal is
detected, we can probe the dark matter mass and the dark coupling constant
after combining both the displaced lepton jet and monojet searches. We further
show the CMS dimuon search can be sensitive to the final state radiation of the
dark photon. Our results demonstrate terrestrial collider experiments
complement astronomical observations of galaxies in the search of the
self-interacting nature of dark matter.
|
[
{
"created": "Wed, 14 Nov 2018 19:02:15 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Sep 2019 01:18:34 GMT",
"version": "v2"
}
] |
2019-10-02
|
[
[
"Tsai",
"Yuhsin",
""
],
[
"Xu",
"Tao",
""
],
[
"Yu",
"Hai-Bo",
""
]
] |
We study self-interacting dark matter signatures at the Large Hadron Collider. A light dark photon, mediating dark matter self-interactions, can bind dark matter particles to form a bound state when they are produced via a heavy pseduoscalar in $pp$ collisions. The bound state can further annihilate into a pair of boosted dark photons, which subsequently decay into charged leptons through a kinetic mixing portal, resulting in striking displaced lepton jet signals. After adapting the analysis used in the ATLAS experiment, we explore the reach of the model parameters at the $13~{\rm TeV}$ run with an integrated luminosity of $300~{\rm fb^{-1}}$. For heavy dark matter, the displaced lepton jet searches can surpass traditional monojet signals in setting the lower bound on the pseduoscalar mass. If a positive signal is detected, we can probe the dark matter mass and the dark coupling constant after combining both the displaced lepton jet and monojet searches. We further show the CMS dimuon search can be sensitive to the final state radiation of the dark photon. Our results demonstrate terrestrial collider experiments complement astronomical observations of galaxies in the search of the self-interacting nature of dark matter.
|
0710.4943
|
Marcos Rodriguez Cardoso
|
C.M. Maekawa and M. C. Rodriguez
|
Radiative Mechanism to Light Fermion Masses in the MSSM
|
22 pages, 8 figures, TeX mistakes corrected, accepted for publication
in JHEP
|
JHEP 0801:072,2008
|
10.1088/1126-6708/2008/01/072
| null |
hep-ph
| null |
In a previous work we have showed that the ${\cal Z}_{2}^{\prime}$ Symmetry,
imply that the light fermions, the electron and the quarks, $u,d$ and $s$, get
their masses only at one loop level. Here, we considere the more general
hypothesis for flavour mixing in the sfermion sector in the MSSM. Then, we
present our results to the masses of these light fermions and as a final result
we can explain why the $s$ quark is heavier than the $u,d$ quarks. This
mechanism is in agrement with the experimental constraint on the sfermion's
masses values.
|
[
{
"created": "Thu, 25 Oct 2007 19:38:06 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Feb 2008 09:29:28 GMT",
"version": "v2"
}
] |
2009-01-06
|
[
[
"Maekawa",
"C. M.",
""
],
[
"Rodriguez",
"M. C.",
""
]
] |
In a previous work we have showed that the ${\cal Z}_{2}^{\prime}$ Symmetry, imply that the light fermions, the electron and the quarks, $u,d$ and $s$, get their masses only at one loop level. Here, we considere the more general hypothesis for flavour mixing in the sfermion sector in the MSSM. Then, we present our results to the masses of these light fermions and as a final result we can explain why the $s$ quark is heavier than the $u,d$ quarks. This mechanism is in agrement with the experimental constraint on the sfermion's masses values.
|
hep-ph/0101144
|
Yasuo Umino
|
Yasuo Umino
|
Hamiltonian lattice QCD at finite density: equation of state in the
strong coupling limit
|
27 pages, 6 figures. Uses ReVTeX4 and BiBTeX. Revised version
|
Phys.Rev. D66 (2002) 074501
|
10.1103/PhysRevD.66.074501
|
IFIC-00-86, FTUV-00-1221
|
hep-ph astro-ph hep-lat hep-th nucl-th
| null |
The equation of state of Hamiltonian lattice QCD at finite density is
examined in the strong coupling limit by constructing a solution to the
equation of motion corresponding to an effective Hamiltonian describing the
ground state of the many body system. This solution exactly diagonalizes the
Hamiltonian to second order in field operators for all densities and is used to
evaluate the vacuum energy density from which we obtain the equation of state.
We find that up to and beyond the chiral symmetry restoration density the
pressure of the quark Fermi sea can be negative indicating its mechanical
instability. Our result is in qualitative agreement with continuum models and
should be verifiable by future lattice simulations of strongly coupled QCD at
finite density.
|
[
{
"created": "Sun, 14 Jan 2001 22:20:43 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jan 2001 21:43:10 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jun 2002 18:22:30 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Umino",
"Yasuo",
""
]
] |
The equation of state of Hamiltonian lattice QCD at finite density is examined in the strong coupling limit by constructing a solution to the equation of motion corresponding to an effective Hamiltonian describing the ground state of the many body system. This solution exactly diagonalizes the Hamiltonian to second order in field operators for all densities and is used to evaluate the vacuum energy density from which we obtain the equation of state. We find that up to and beyond the chiral symmetry restoration density the pressure of the quark Fermi sea can be negative indicating its mechanical instability. Our result is in qualitative agreement with continuum models and should be verifiable by future lattice simulations of strongly coupled QCD at finite density.
|
hep-ph/0202093
|
Kenneth Lane
|
Kenneth Lane
|
A Case Study in Dimensional Deconstruction
|
20 pages, LaTeX, with 8 postscript figures
|
Phys.Rev. D65 (2002) 115001
|
10.1103/PhysRevD.65.115001
|
FERMILAB-PUB-02/019-T; BUHEP-02-11
|
hep-ph hep-ex
| null |
We test Arkani-Hamed et al.'s dimensional deconstruction on a model that is
predicted to have a naturally light composite Higgs boson, i.e., one whose mass
M is much less than its binding scale \Lambda, and whose quartic coupling
\lambda is large, so that its vacuum expectation value v \sim M/\sqrt{\lambda}
<< \Lambda also. We consider two different underlying dynamics--UV
completions--at the scale \Lambda for this model. We find that the expectation
from dimensional deconstruction is not realized and that low energy details
depend crucially on the UV completion. In one case, M << \Lambda and \lambda <<
1, hence, v \sim \Lambda. In the other, \lambda can be large or small, but then
so is M, and v is still O(\Lambda).
|
[
{
"created": "Sun, 10 Feb 2002 17:56:27 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Lane",
"Kenneth",
""
]
] |
We test Arkani-Hamed et al.'s dimensional deconstruction on a model that is predicted to have a naturally light composite Higgs boson, i.e., one whose mass M is much less than its binding scale \Lambda, and whose quartic coupling \lambda is large, so that its vacuum expectation value v \sim M/\sqrt{\lambda} << \Lambda also. We consider two different underlying dynamics--UV completions--at the scale \Lambda for this model. We find that the expectation from dimensional deconstruction is not realized and that low energy details depend crucially on the UV completion. In one case, M << \Lambda and \lambda << 1, hence, v \sim \Lambda. In the other, \lambda can be large or small, but then so is M, and v is still O(\Lambda).
|
1810.09990
|
Alberto Mart\'inez Torres
|
K. P. Khemchandani, A. Mart\'inez Torres, J. A. Oller
|
Hyperon resonances coupled to pseudoscalar- and vector-baryon channels
|
Published version in Physics. Rev. C
|
Phys. Rev. C 100, 015208 (2019)
|
10.1103/PhysRevC.100.015208
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study hyperon resonances by solving coupled channel scattering equations.
The coupled systems include pseudoscalar- and vector-baryon channels. The
parameters of the model are restricted by making a $\chi^2$-fit to the cross
section data on processes: $K^- p \to K^- p$, $K^- p \to \bar K^0 n$, $K^- p
\to \eta \Lambda$, $K^- p \to \pi^0 \Lambda$, $K^- p \to \pi^0 \Sigma^0$, $K^-
p \to \pi^\pm \Sigma^\mp$. Data on the energy level shift and width of the $1s$
state of the kaonic hydrogen, as well as some cross-section ratios near the
threshold are also considered in the fit. Two types of fits are found as a
result. In both cases, the properties of $\Lambda(1405)$ are well reproduced.
In addition to this, a $\Sigma$ state is also found with mass around 1400 MeV.
Cross sections, obtained with one of the two fits, are found to stay close to
the data at energies away from the thresholds too, and as a result resonances
with higher masses have also been studied.
|
[
{
"created": "Tue, 23 Oct 2018 17:45:12 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2019 18:28:20 GMT",
"version": "v2"
}
] |
2019-08-07
|
[
[
"Khemchandani",
"K. P.",
""
],
[
"Torres",
"A. Martínez",
""
],
[
"Oller",
"J. A.",
""
]
] |
We study hyperon resonances by solving coupled channel scattering equations. The coupled systems include pseudoscalar- and vector-baryon channels. The parameters of the model are restricted by making a $\chi^2$-fit to the cross section data on processes: $K^- p \to K^- p$, $K^- p \to \bar K^0 n$, $K^- p \to \eta \Lambda$, $K^- p \to \pi^0 \Lambda$, $K^- p \to \pi^0 \Sigma^0$, $K^- p \to \pi^\pm \Sigma^\mp$. Data on the energy level shift and width of the $1s$ state of the kaonic hydrogen, as well as some cross-section ratios near the threshold are also considered in the fit. Two types of fits are found as a result. In both cases, the properties of $\Lambda(1405)$ are well reproduced. In addition to this, a $\Sigma$ state is also found with mass around 1400 MeV. Cross sections, obtained with one of the two fits, are found to stay close to the data at energies away from the thresholds too, and as a result resonances with higher masses have also been studied.
|
hep-ph/9710230
|
Tomohiro Matsuda
|
Tomohiro Matsuda
|
Domain wall solution for vector like model
|
9 pages, Latex, Final version to appear in Physics Letter B
|
Phys.Lett. B423 (1998) 40-44
|
10.1016/S0370-2693(98)00097-5
|
KEK-TH-546
|
hep-ph hep-th
| null |
Domain wall solution for $N_{c}=N_{f}$ supersymmetric QCD is constructed.
Astrophysical implications of the domain wall configuration is also discussed.
|
[
{
"created": "Fri, 3 Oct 1997 04:46:05 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 1997 06:08:54 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Matsuda",
"Tomohiro",
""
]
] |
Domain wall solution for $N_{c}=N_{f}$ supersymmetric QCD is constructed. Astrophysical implications of the domain wall configuration is also discussed.
|
hep-ph/9811349
|
Andreas Metz
|
U. D'Alesio, A. Metz and H.J. Pirner
|
Soft and Hard Pomeron in the Structure Function of the Proton at Low x
and Low Q^2
|
18 pages, Latex, 6 PS-figures, Regge-exchange neglected, more details
concerning the soft Pomeron included, section on the longitudinal structure
function added, all conclusions unchanged, final version to appear in Eur.
Phys. J. C
|
Eur.Phys.J.C9:601-609,1999
|
10.1007/s100529900096
|
HD-TVP-98-10
|
hep-ph
| null |
We study inclusive electroproduction on the proton at low $x$ and low $Q^2$
using a soft and a hard Pomeron. The contribution of the soft Pomeron is based
on the Stochastic Vacuum Model, in which a nonperturbative dipole-dipole cross
section can be calculated by means of a gauge invariant gluon field strength
correlator. To model the hard Pomeron exchange we phenomenologically extend the
leading order evolution of a power-behaved structure function, $F_2 \propto
x^{- \lambda}$, proposed by L\'opez and Yndur\'ain. This extension allows to
consider both the case $Q^2 = 0$ and the region of higher $Q^2$ on the basis of
the same parametrization. A good simultaneous fit to the data on $F_2$ and on
the cross section $\sigma_{\gamma p}$ of real photoproduction is obtained for
$\lambda=0.37$. With four parameters we achieve a $\chi^2/\textrm{d.o.f.} =
0.98$ for 222 data points. In addition, we use our model of the inclusive
$\gamma^{\ast} p$ interaction to compute the longitudinal structure function
$F_L$.
|
[
{
"created": "Mon, 16 Nov 1998 18:23:34 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 1999 14:18:35 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"D'Alesio",
"U.",
""
],
[
"Metz",
"A.",
""
],
[
"Pirner",
"H. J.",
""
]
] |
We study inclusive electroproduction on the proton at low $x$ and low $Q^2$ using a soft and a hard Pomeron. The contribution of the soft Pomeron is based on the Stochastic Vacuum Model, in which a nonperturbative dipole-dipole cross section can be calculated by means of a gauge invariant gluon field strength correlator. To model the hard Pomeron exchange we phenomenologically extend the leading order evolution of a power-behaved structure function, $F_2 \propto x^{- \lambda}$, proposed by L\'opez and Yndur\'ain. This extension allows to consider both the case $Q^2 = 0$ and the region of higher $Q^2$ on the basis of the same parametrization. A good simultaneous fit to the data on $F_2$ and on the cross section $\sigma_{\gamma p}$ of real photoproduction is obtained for $\lambda=0.37$. With four parameters we achieve a $\chi^2/\textrm{d.o.f.} = 0.98$ for 222 data points. In addition, we use our model of the inclusive $\gamma^{\ast} p$ interaction to compute the longitudinal structure function $F_L$.
|
hep-ph/0006026
|
Carlo Giunti
|
M.V. Garzelli, C. Giunti
|
Statistical treatment of detection cross-section uncertainties in the
analysis of solar neutrino data
|
12 pages. Corrected Figures 4 and 5 (vacuum oscillations)
|
Phys.Lett. B488 (2000) 339-343
|
10.1016/S0370-2693(00)00866-2
|
DFTT 23/00
|
hep-ph
| null |
We propose a modification to the standard statistical treatment of the
detection cross-section uncertainties in the analysis of solar neutrino data.
We argue that the uncertainties of the energy-averaged cross sections of the
different neutrino fluxes in the same experiment should be treated as
correlated. We show that the resulting allowed regions for the neutrino
oscillation parameters are significantly larger than the ones obtained with
uncorrelated uncertainties.
|
[
{
"created": "Fri, 2 Jun 2000 14:01:22 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jun 2000 17:28:03 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Garzelli",
"M. V.",
""
],
[
"Giunti",
"C.",
""
]
] |
We propose a modification to the standard statistical treatment of the detection cross-section uncertainties in the analysis of solar neutrino data. We argue that the uncertainties of the energy-averaged cross sections of the different neutrino fluxes in the same experiment should be treated as correlated. We show that the resulting allowed regions for the neutrino oscillation parameters are significantly larger than the ones obtained with uncorrelated uncertainties.
|
hep-ph/0303247
|
Ciprian Dariescu
|
Marina-Aura Dariescu, Ciprian Dariescu (U.of Oregon)
|
Branching Ratio and direct CP Asymmetry for $B \to K^{*} \gamma$ Decay
in MSSM
|
12 pages, 3 figures
| null | null | null |
hep-ph
| null |
The present paper deals with a next-to-leading order analysis of the
radiative $B \to K^* \gamma$ decay. Working in the PQCD approach developed by
Szczepaniak {\it et al.}, we compute the correction, coming from a single gluon
exchange with the spectator, to the essential form factor. Since the branching
ratio gets much above the experimental data, although in agreement with other
theoretical models predictions, we take into consideration the effects of
complex flavour couplings in the squark sector. Finally, we discuss these SUSY
implications on the branching ratio and direct CP asymmetry values and impose
bounds on the squark mixing parameter $(\delta_{23}^d)_{LR}$.
|
[
{
"created": "Fri, 28 Mar 2003 23:28:45 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dariescu",
"Marina-Aura",
"",
"U.of Oregon"
],
[
"Dariescu",
"Ciprian",
"",
"U.of Oregon"
]
] |
The present paper deals with a next-to-leading order analysis of the radiative $B \to K^* \gamma$ decay. Working in the PQCD approach developed by Szczepaniak {\it et al.}, we compute the correction, coming from a single gluon exchange with the spectator, to the essential form factor. Since the branching ratio gets much above the experimental data, although in agreement with other theoretical models predictions, we take into consideration the effects of complex flavour couplings in the squark sector. Finally, we discuss these SUSY implications on the branching ratio and direct CP asymmetry values and impose bounds on the squark mixing parameter $(\delta_{23}^d)_{LR}$.
|
hep-ph/9503274
|
Nakanishi Ken
|
Yasuhiko Nagoshi and Ken Nakanishi
|
Dynamical Generation of CKM Mixings by Broken Horizontal Gauge
Interactions
|
20 pages + 1 uuencoded eps figure, PHYZZX
|
Phys.Rev.D52:4143-4150,1995
|
10.1103/PhysRevD.52.4143
|
KUNS-1326
|
hep-ph
| null |
The fermion mass matrices are calculated in the framework of the dynamical
mass generation by the broken horizontal gauge interactions. The
non-proportional mass spectra between up- and down-sectors and CKM mixings are
obtained solely by radiative corrections due to the ordinary gauge
interactions.
|
[
{
"created": "Thu, 9 Mar 1995 07:47:45 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Nagoshi",
"Yasuhiko",
""
],
[
"Nakanishi",
"Ken",
""
]
] |
The fermion mass matrices are calculated in the framework of the dynamical mass generation by the broken horizontal gauge interactions. The non-proportional mass spectra between up- and down-sectors and CKM mixings are obtained solely by radiative corrections due to the ordinary gauge interactions.
|
2306.01255
|
Adil Jueid
|
Adil Jueid, Talal Ahmed Chowdhury, Salah Nasri, Shaikh Saad
|
Probing Zee-Babu states at Muon Colliders
|
v3: 33 pages, matches version accepted for publication in Physical
Review D. v2: 28 pages, some typos are fixed. Main results are unchanged. v1:
27 pages, 10 figures and 5 tables. Comments are welcome!
| null | null |
CTPU-PTC-23-23
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The Zee-Babu model is a minimal realization of radiative neutrino mass
generation mechanism at the two-loop level. We study the phenomenology of this
model at future multi-TeV muon colliders. After imposing all theoretical and
low-energy experimental constraints on the model parameters, we find that the
Zee-Babu states are expected not to reside below the TeV scale, making it
challenging to probe them at the LHC. We first analyze the production rates for
various channels, including multi singly-charged and/or doubly-charged scalars
at muon colliders. For concreteness, we study several benchmark points that
satisfy neutrino oscillation data and other constraints and find that most
channels have large production rates. We then analyze the discovery reach of
the model using two specific channels: the pair production of singly- and
doubly-charged scalars. For the phenomenologically viable scenarios considered
in this study, charged scalars with masses up to ${\cal O}(3$--$4)$ TeV can be
probed for the center-of-mass energy of $10$ TeV and total luminosity of
$10~{\rm ab}^{-1}$.
|
[
{
"created": "Fri, 2 Jun 2023 03:40:45 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2023 05:51:26 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Mar 2024 14:55:55 GMT",
"version": "v3"
}
] |
2024-03-14
|
[
[
"Jueid",
"Adil",
""
],
[
"Chowdhury",
"Talal Ahmed",
""
],
[
"Nasri",
"Salah",
""
],
[
"Saad",
"Shaikh",
""
]
] |
The Zee-Babu model is a minimal realization of radiative neutrino mass generation mechanism at the two-loop level. We study the phenomenology of this model at future multi-TeV muon colliders. After imposing all theoretical and low-energy experimental constraints on the model parameters, we find that the Zee-Babu states are expected not to reside below the TeV scale, making it challenging to probe them at the LHC. We first analyze the production rates for various channels, including multi singly-charged and/or doubly-charged scalars at muon colliders. For concreteness, we study several benchmark points that satisfy neutrino oscillation data and other constraints and find that most channels have large production rates. We then analyze the discovery reach of the model using two specific channels: the pair production of singly- and doubly-charged scalars. For the phenomenologically viable scenarios considered in this study, charged scalars with masses up to ${\cal O}(3$--$4)$ TeV can be probed for the center-of-mass energy of $10$ TeV and total luminosity of $10~{\rm ab}^{-1}$.
|
1301.3013
|
Felix Karbstein
|
Nora Brambilla, Felix Karbstein, Antonio Vairo
|
Symmetries of the Three Heavy-Quark System and the Color-Singlet Static
Energy at NNLL
|
27 pages, 3 figures; matches journal version
|
Phys. Rev. D 87, 074014 (2013)
|
10.1103/PhysRevD.87.074014
|
TUM-EFT 29/11
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the symmetries of the three heavy-quark system under exchange of the
quark fields within the effective field theory framework of potential
non-relativistic QCD. The symmetries constrain the form of the matching
coefficients in the effective theory. We then focus on the color-singlet sector
and determine the so far unknown leading ultrasoft contribution to the static
potential, which is of order alpha_s^4 ln(\mu), and consequently to the static
energy, which is of order alpha_s^4 ln(alpha_s). Finally, in the case of an
equilateral geometry, we solve the renormalization group equations and resum
the leading ultrasoft logarithms for the static potential of three quarks in a
color singlet, octet and decuplet representation.
|
[
{
"created": "Mon, 14 Jan 2013 15:24:11 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Apr 2013 07:53:31 GMT",
"version": "v2"
}
] |
2013-04-16
|
[
[
"Brambilla",
"Nora",
""
],
[
"Karbstein",
"Felix",
""
],
[
"Vairo",
"Antonio",
""
]
] |
We study the symmetries of the three heavy-quark system under exchange of the quark fields within the effective field theory framework of potential non-relativistic QCD. The symmetries constrain the form of the matching coefficients in the effective theory. We then focus on the color-singlet sector and determine the so far unknown leading ultrasoft contribution to the static potential, which is of order alpha_s^4 ln(\mu), and consequently to the static energy, which is of order alpha_s^4 ln(alpha_s). Finally, in the case of an equilateral geometry, we solve the renormalization group equations and resum the leading ultrasoft logarithms for the static potential of three quarks in a color singlet, octet and decuplet representation.
|
hep-ph/0209062
|
Dan Hooper
|
D. Hooper, H. Nunokawa, O.L.G. Peres and R. Zukanovich Funchal
|
Measuring the Spectra of High Energy Neutrinos with a Kilometer-Scale
Neutrino Telescope
|
21 pages, 7 figures
|
Phys.Rev. D67 (2003) 013001
|
10.1103/PhysRevD.67.013001
|
MADPH-02-1306, IFT-P.060/2002, IFUSP-DFN/02-077
|
hep-ph astro-ph
| null |
We investigate the potential of a future kilometer-scale neutrino telescope
such as the proposed IceCube detector in the South Pole, to measure and
disentangle the yet unknown components of the cosmic neutrino flux, the prompt
atmospheric neutrinos coming from the decay of charmed particles and the
extra-galactic neutrinos, in the 10 TeV to 1 EeV energy range.
Assuming a power law type spectra,
$d\phi_\nu/dE_\nu \sim \alpha E_\nu^\beta$, we quantify the discriminating
power of the IceCube detector and discuss how well we can determine magnitude
($\alpha$) as well as slope ($\beta$) of these two components of the high
energy neutrino spectrum, taking into account the background coming from the
conventional atmospheric neutrinos.
|
[
{
"created": "Thu, 5 Sep 2002 17:08:00 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Sep 2002 16:16:15 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Hooper",
"D.",
""
],
[
"Nunokawa",
"H.",
""
],
[
"Peres",
"O. L. G.",
""
],
[
"Funchal",
"R. Zukanovich",
""
]
] |
We investigate the potential of a future kilometer-scale neutrino telescope such as the proposed IceCube detector in the South Pole, to measure and disentangle the yet unknown components of the cosmic neutrino flux, the prompt atmospheric neutrinos coming from the decay of charmed particles and the extra-galactic neutrinos, in the 10 TeV to 1 EeV energy range. Assuming a power law type spectra, $d\phi_\nu/dE_\nu \sim \alpha E_\nu^\beta$, we quantify the discriminating power of the IceCube detector and discuss how well we can determine magnitude ($\alpha$) as well as slope ($\beta$) of these two components of the high energy neutrino spectrum, taking into account the background coming from the conventional atmospheric neutrinos.
|
1410.8505
|
Patrick Draper
|
Michael Dine, Patrick Draper, Guido Festuccia
|
Instanton Effects in Three Flavor QCD
|
22 pages, 2 figures. v3: reordered discussion of finite correlators
and low energy constants, version published in PRD. v2: amended discussion of
calculable vs incalculable effects for $N_f\leq N$
|
Phys. Rev. D 92, 054004 (2015)
|
10.1103/PhysRevD.92.054004
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently it was shown that in QCD-like theories with $N_f > N$, where $N_f$
is the number of light flavors and $N$ is the number of colors, there are
correlation functions that vanish in perturbation theory and at short distances
receive dominant, calculable contributions from small instantons. Here we
extend the set of such objects to theories with $N_f = N$, which includes real
QCD, and discuss their application as a calibration of lattice computations at
small quark mass. We revisit the related issue of the $u$ quark mass and its
additive renormalization by small instantons, and discuss an alternative test
of $m_u=0$ on the lattice.
|
[
{
"created": "Thu, 30 Oct 2014 19:25:49 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Nov 2014 04:31:26 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Oct 2015 17:48:22 GMT",
"version": "v3"
}
] |
2015-10-13
|
[
[
"Dine",
"Michael",
""
],
[
"Draper",
"Patrick",
""
],
[
"Festuccia",
"Guido",
""
]
] |
Recently it was shown that in QCD-like theories with $N_f > N$, where $N_f$ is the number of light flavors and $N$ is the number of colors, there are correlation functions that vanish in perturbation theory and at short distances receive dominant, calculable contributions from small instantons. Here we extend the set of such objects to theories with $N_f = N$, which includes real QCD, and discuss their application as a calibration of lattice computations at small quark mass. We revisit the related issue of the $u$ quark mass and its additive renormalization by small instantons, and discuss an alternative test of $m_u=0$ on the lattice.
|
1012.4038
|
Andrea Dainese
|
A. Dainese (INFN Padova)
|
Review on Heavy-Ion Physics
|
8 pages, 4 figures, proceedings of the conference IFAE 2010 (Incontri
di Fisica delle Alte Energie), Roma, April 2010
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Collisions of heavy ions (nuclei) at ultra-relativistic energies (sqrt(s_NN)
>> 10 GeV per nucleon-nucleon collision in the centre of mass system) are
regarded as a unique tool to produce in the laboratory a high energy density
and high temperature state of strongly-interacting matter. In this short
review, we will discuss the expected features of this hot and dense state,
describe indications on its properties emerged from the experimental programs
at the CERN-SPS and BNL-RHIC accelerators, and finally outlook the perspectives
for the forthcoming heavy-ion runs at the CERN-LHC.
|
[
{
"created": "Sat, 18 Dec 2010 00:02:10 GMT",
"version": "v1"
}
] |
2010-12-21
|
[
[
"Dainese",
"A.",
"",
"INFN Padova"
]
] |
Collisions of heavy ions (nuclei) at ultra-relativistic energies (sqrt(s_NN) >> 10 GeV per nucleon-nucleon collision in the centre of mass system) are regarded as a unique tool to produce in the laboratory a high energy density and high temperature state of strongly-interacting matter. In this short review, we will discuss the expected features of this hot and dense state, describe indications on its properties emerged from the experimental programs at the CERN-SPS and BNL-RHIC accelerators, and finally outlook the perspectives for the forthcoming heavy-ion runs at the CERN-LHC.
|
2107.02535
|
Antoni Szczurek
|
Antoni Szczurek, Barbara Linek and Marta {\L}uszczak
|
Semiexclusive dilepton production in proton-proton collisions with one
forward proton measurement at the LHC
|
33 pages, 30 figures, 3 tables
| null |
10.1103/PhysRevD.104.074009
| null |
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We discuss photon-photon fusion mechanisms of dilepton production in
proton-proton collisions with rapidity gap in the main detector and one forward
proton in the forward proton detectors. This is relevant for the LHC
measurements by ATLAS+AFP and CMS+PPS. Transverse momenta of the intermediate
photons are taken into account and photon fluxes are expressed in terms of
proton electromagnetic form factors and structure functions. Differential
distributions in $\xi_{1/2}$, $M_{ll}$, $Y_{ll}$, $p_{t,ll}$, $M_R$ %pamietac
wyjasnic M_R w tekscie are shown and the competition of different mechanisms is
discussed. Both double-elastic and single-dissociative processes are included
in the analysis. Different parametrizations of the structure functions are
used. We discuss also mechanism with one forward $\Delta^+$ isobar, or other
proton resonances in the final state. The role of several cuts is studied. We
also use SuperChic generator and compare corresponding results to the results
of our codes. The soft rapidity gap survival factor is calculated for each
contribution separately. The gap survival factor for the single-dissociative
mechanism due to minijet emission into the main detector is calculated in
addition. It depends on the type of contribution (fully elastic, single
dissociation, double dissociation). The soft rapidity gap survival factor for
the case of single proton measurement is significantly smaller than that for
the inclusive case (no proton measurement). We find only weak dependence on the
invariant mass of the dilepton system as well as the lepton pair transverse
momentum and sizeable dependence on the pair rapidity. The latter effect is
rather difficult to identify experimentally.
|
[
{
"created": "Tue, 6 Jul 2021 11:01:18 GMT",
"version": "v1"
}
] |
2021-10-27
|
[
[
"Szczurek",
"Antoni",
""
],
[
"Linek",
"Barbara",
""
],
[
"Łuszczak",
"Marta",
""
]
] |
We discuss photon-photon fusion mechanisms of dilepton production in proton-proton collisions with rapidity gap in the main detector and one forward proton in the forward proton detectors. This is relevant for the LHC measurements by ATLAS+AFP and CMS+PPS. Transverse momenta of the intermediate photons are taken into account and photon fluxes are expressed in terms of proton electromagnetic form factors and structure functions. Differential distributions in $\xi_{1/2}$, $M_{ll}$, $Y_{ll}$, $p_{t,ll}$, $M_R$ %pamietac wyjasnic M_R w tekscie are shown and the competition of different mechanisms is discussed. Both double-elastic and single-dissociative processes are included in the analysis. Different parametrizations of the structure functions are used. We discuss also mechanism with one forward $\Delta^+$ isobar, or other proton resonances in the final state. The role of several cuts is studied. We also use SuperChic generator and compare corresponding results to the results of our codes. The soft rapidity gap survival factor is calculated for each contribution separately. The gap survival factor for the single-dissociative mechanism due to minijet emission into the main detector is calculated in addition. It depends on the type of contribution (fully elastic, single dissociation, double dissociation). The soft rapidity gap survival factor for the case of single proton measurement is significantly smaller than that for the inclusive case (no proton measurement). We find only weak dependence on the invariant mass of the dilepton system as well as the lepton pair transverse momentum and sizeable dependence on the pair rapidity. The latter effect is rather difficult to identify experimentally.
|
hep-ph/9501403
|
Mannque Rho
|
Mannque Rho (CEA Saclay)
|
CHIRAL SYMMETRY RESTORATION AS THE GEORGI VECTOR LIMIT
|
11 pages, LATEX, no figures; invited talk at Hirschegg '95: "Hadrons
in Nuclear Matter".
| null | null | null |
hep-ph nucl-th
| null |
I discuss recent work done with Gerry Brown on chiral phase transition at
high temperature and/or density described in terms of Georgi's vector limit.
The notion of ``mended symmetry" is suggested to play an important role in
understanding the properties of hadrons in dense and/or hot matter before
reaching the phase transition. It is shown that while the QCD vacuum in
baryon-free space is resistant to ``melting" up to the critical temperature,
baryon-rich medium can induce the vacuum to become softer in temperature: the
hadron masses drop faster in temperature when baryon matter is present.
|
[
{
"created": "Mon, 30 Jan 1995 12:09:34 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Rho",
"Mannque",
"",
"CEA Saclay"
]
] |
I discuss recent work done with Gerry Brown on chiral phase transition at high temperature and/or density described in terms of Georgi's vector limit. The notion of ``mended symmetry" is suggested to play an important role in understanding the properties of hadrons in dense and/or hot matter before reaching the phase transition. It is shown that while the QCD vacuum in baryon-free space is resistant to ``melting" up to the critical temperature, baryon-rich medium can induce the vacuum to become softer in temperature: the hadron masses drop faster in temperature when baryon matter is present.
|
hep-ph/0509324
|
Zhe Xu
|
Z. Xu and C. Greiner
|
Thermalization of gluons at RHIC including gg <-> ggg interactions in a
parton cascade
|
4 pages, 3 figures; Contribution to proceedings of Quark Matter 2005,
Budapest, Hungary, Aug 4-9 2005
|
Nucl.Phys. A774 (2006) 787-790
|
10.1016/j.nuclphysa.2006.06.136
| null |
hep-ph
| null |
Employing a newly developed pQCD inspired parton cascade we simulate the
space time evolution of gluons which are produced initially in a heavy ion
collision at RHIC energy. The inelastic $gg \leftrightarrow ggg$ interactions
are for the first time implemented obeying full detailed balance. The numerical
results show that thermalization of gluons is mainly driven by the inelastic
gluonic interactions and reaches equilibrium at $1\sim 2$ fm/c. In simulations
for noncentral collisions considerable partonic elliptic flow $v_2$ is
generated being comparable with the experimental data.
|
[
{
"created": "Wed, 28 Sep 2005 13:22:12 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Xu",
"Z.",
""
],
[
"Greiner",
"C.",
""
]
] |
Employing a newly developed pQCD inspired parton cascade we simulate the space time evolution of gluons which are produced initially in a heavy ion collision at RHIC energy. The inelastic $gg \leftrightarrow ggg$ interactions are for the first time implemented obeying full detailed balance. The numerical results show that thermalization of gluons is mainly driven by the inelastic gluonic interactions and reaches equilibrium at $1\sim 2$ fm/c. In simulations for noncentral collisions considerable partonic elliptic flow $v_2$ is generated being comparable with the experimental data.
|
2107.03946
|
Xiangkun Dong
|
Xiang-Kun Dong, Vadim Baru, Feng-Kun Guo, Christoph Hanhart, Alexey
Nefediev and Bing-Song Zou
|
Is the existence of a $J/\psi J/\psi$ bound state plausible?
|
11 pages, 7 figures, version to appear in Sci. Bull
|
Science Bulletin 66 (2021) 24, 2462-2470
|
10.1016/j.scib.2021.09.009
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
In a recent measurement LHCb reported pronounced structures in the $J/\psi
J/\psi$ spectrum. One of the various possible explanations of those is that
they emerge from non-perturbative interactions of vector charmonia. It is thus
important to understand whether it is possible to form a bound state of two
charmonia interacting through the exchange of gluons, which hadronise into two
pions at the longest distance. In this paper, we demonstrate that, given our
current understanding of hadron-hadron interactions, the exchange of correlated
light mesons (pions and kaons) is able to provide sizeable attraction to the
di-$J/\psi$ system, and it is possible for two $J/\psi$ mesons to form a bound
state. As a side result we find from an analysis of the data for the
$\psi(2S)\to J/\psi \pi\pi$ transition including both $\pi\pi$ and $K\bar K$
final state interactions an improved value for the $\psi(2S)\to J/\psi$
transition chromo-electric polarisability: $|\alpha_{\psi(2S)J/\psi}|= (1.8\pm
0.1)~\mbox{GeV}^{-3}$, where the uncertainty also includes the one induced by
the final state interactions.
|
[
{
"created": "Thu, 8 Jul 2021 16:17:52 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Oct 2021 02:43:52 GMT",
"version": "v2"
}
] |
2021-10-26
|
[
[
"Dong",
"Xiang-Kun",
""
],
[
"Baru",
"Vadim",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Hanhart",
"Christoph",
""
],
[
"Nefediev",
"Alexey",
""
],
[
"Zou",
"Bing-Song",
""
]
] |
In a recent measurement LHCb reported pronounced structures in the $J/\psi J/\psi$ spectrum. One of the various possible explanations of those is that they emerge from non-perturbative interactions of vector charmonia. It is thus important to understand whether it is possible to form a bound state of two charmonia interacting through the exchange of gluons, which hadronise into two pions at the longest distance. In this paper, we demonstrate that, given our current understanding of hadron-hadron interactions, the exchange of correlated light mesons (pions and kaons) is able to provide sizeable attraction to the di-$J/\psi$ system, and it is possible for two $J/\psi$ mesons to form a bound state. As a side result we find from an analysis of the data for the $\psi(2S)\to J/\psi \pi\pi$ transition including both $\pi\pi$ and $K\bar K$ final state interactions an improved value for the $\psi(2S)\to J/\psi$ transition chromo-electric polarisability: $|\alpha_{\psi(2S)J/\psi}|= (1.8\pm 0.1)~\mbox{GeV}^{-3}$, where the uncertainty also includes the one induced by the final state interactions.
|
1106.5965
|
Florian Hebenstreit
|
Florian Hebenstreit
|
Schwinger effect in inhomogeneous electric fields
|
PhD thesis, 121 pages
| null | null | null |
hep-ph hep-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The vacuum of quantum electrodynamics is unstable against the formation of
many-body states in the presence of an external electric field, manifesting
itself as the creation of electron-positron pairs (Schwinger effect). This
effect has been a long-standing but still unobserved prediction as the
generation of the required field strengths has not been feasible so far.
However, due to the advent of a new generation of high-intensity laser systems
such as the European XFEL or the Extreme Light Infrastructure (ELI), this
effect might eventually become observable within the next decades. Based on the
equal-time Wigner formalism, various aspects of the Schwinger effect in
electric fields showing both temporal and spatial variations are investigated.
Regarding the Schwinger effect in time-dependent electric fields, analytic
expressions for the equal-time Wigner function in the presence of a static as
well as a pulsed electric field are derived. Moreover, the pair creation
process in the presence of a pulsed electric field with sub-cycle structure,
which acts as a model for a realistic laser pulse, is examined. Finally, an ab
initio simulation of the Schwinger effect in a simple space- and time-dependent
electric field is performed for the first time, allowing for the calculation of
the time evolution of various observables like the charge density, the particle
number density or the number of created particles.
|
[
{
"created": "Wed, 29 Jun 2011 15:11:05 GMT",
"version": "v1"
}
] |
2011-07-01
|
[
[
"Hebenstreit",
"Florian",
""
]
] |
The vacuum of quantum electrodynamics is unstable against the formation of many-body states in the presence of an external electric field, manifesting itself as the creation of electron-positron pairs (Schwinger effect). This effect has been a long-standing but still unobserved prediction as the generation of the required field strengths has not been feasible so far. However, due to the advent of a new generation of high-intensity laser systems such as the European XFEL or the Extreme Light Infrastructure (ELI), this effect might eventually become observable within the next decades. Based on the equal-time Wigner formalism, various aspects of the Schwinger effect in electric fields showing both temporal and spatial variations are investigated. Regarding the Schwinger effect in time-dependent electric fields, analytic expressions for the equal-time Wigner function in the presence of a static as well as a pulsed electric field are derived. Moreover, the pair creation process in the presence of a pulsed electric field with sub-cycle structure, which acts as a model for a realistic laser pulse, is examined. Finally, an ab initio simulation of the Schwinger effect in a simple space- and time-dependent electric field is performed for the first time, allowing for the calculation of the time evolution of various observables like the charge density, the particle number density or the number of created particles.
|
0708.4316
|
Arif Shoshi
|
Arif I. Shoshi
|
High energy QCD beyond the mean field approximation
|
8 pages, 4 figures: To appear in the proceedings of 12th
International Conference on Elastic and Diffractive Scattering; Forward
Physics and QCD, DESY, Hamburg, Germany, 21-25 May 2007
| null | null |
BI-TP 2007/18
|
hep-ph
| null |
It has been recently understood how to deal with high-energy scattering
beyond the mean field approximation. We review some of the main steps of this
theoretical progress, like the role of Lorentz invariance and unitarity
requirements, the importance of discreteness and fluctuations of gluon numbers
(Pomeron loops), the high-energy QCD/statistical physics correspondence and the
consequences for the saturation scale, the scattering amplitude and other, also
measurable, quantities.
|
[
{
"created": "Fri, 31 Aug 2007 11:34:31 GMT",
"version": "v1"
}
] |
2007-09-03
|
[
[
"Shoshi",
"Arif I.",
""
]
] |
It has been recently understood how to deal with high-energy scattering beyond the mean field approximation. We review some of the main steps of this theoretical progress, like the role of Lorentz invariance and unitarity requirements, the importance of discreteness and fluctuations of gluon numbers (Pomeron loops), the high-energy QCD/statistical physics correspondence and the consequences for the saturation scale, the scattering amplitude and other, also measurable, quantities.
|
1912.11476
|
Pedro Bicudo
|
P. Bicudo and J.E. Ribeiro
|
QCD vacuum replicas are metastable
|
9 pages, 9 figures, 3 tables; version with details clarified; arXiv
admin note: text overlap with arXiv:hep-ph/0606189
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A metastable phase has important physical implications, since it may form
vacuum bubbles detectable experimentally, whereas an unstable vacuum instantly
explodes. It is well known, due to chiral symmetry breaking, there are at least
two very different QCD vacua. At T=0 and in the true vacuum, the scalar and
pseudoscalar, or the vector and axial vector are not degenerate, and in the
chiral limit, the pseudoscalar ground states are Goldstone bosons. At T=0 the
chiral invariant vacuum is an unstable vacuum, decaying through an infinite
number of scalar and pseudoscalar tachyons. Moreover QCD vacuum replicas, an
infinite tower of excited vacuum solutions, which energy density lies between
the true vacuum and the chiral invariant vacuum, have been predicted in the
Coulomb gauge, due to the non-linearity of the mass gap equation with a
confining interaction. It remained to show whether the QCD replicas are
metastable or unstable. In this paper the spectrum of quark-antiquark systems,
is studied in the true vacuum and in the first excited QCD replicas. The mass
gap equation for the vacua and the Salpeter-RPA equation for the mesons are
solved for a simple chiral invariant and confining quark model approximating
QCD in the Coulomb gauge. We find no tachyons, thus showing the QCD replicas in
our approach is indeed metastable. Moreover the energy spectra of the mesonic
quark-antiquark systems in the first replicas are close to the one of the true
vacuum.
|
[
{
"created": "Mon, 23 Dec 2019 22:06:16 GMT",
"version": "v1"
},
{
"created": "Mon, 4 May 2020 20:25:19 GMT",
"version": "v2"
}
] |
2020-05-06
|
[
[
"Bicudo",
"P.",
""
],
[
"Ribeiro",
"J. E.",
""
]
] |
A metastable phase has important physical implications, since it may form vacuum bubbles detectable experimentally, whereas an unstable vacuum instantly explodes. It is well known, due to chiral symmetry breaking, there are at least two very different QCD vacua. At T=0 and in the true vacuum, the scalar and pseudoscalar, or the vector and axial vector are not degenerate, and in the chiral limit, the pseudoscalar ground states are Goldstone bosons. At T=0 the chiral invariant vacuum is an unstable vacuum, decaying through an infinite number of scalar and pseudoscalar tachyons. Moreover QCD vacuum replicas, an infinite tower of excited vacuum solutions, which energy density lies between the true vacuum and the chiral invariant vacuum, have been predicted in the Coulomb gauge, due to the non-linearity of the mass gap equation with a confining interaction. It remained to show whether the QCD replicas are metastable or unstable. In this paper the spectrum of quark-antiquark systems, is studied in the true vacuum and in the first excited QCD replicas. The mass gap equation for the vacua and the Salpeter-RPA equation for the mesons are solved for a simple chiral invariant and confining quark model approximating QCD in the Coulomb gauge. We find no tachyons, thus showing the QCD replicas in our approach is indeed metastable. Moreover the energy spectra of the mesonic quark-antiquark systems in the first replicas are close to the one of the true vacuum.
|
1705.01105
|
Rebecca Leane
|
Nicole F. Bell, Yi Cai, James B. Dent, Rebecca K. Leane, Thomas J.
Weiler
|
Enhancing Dark Matter Annihilation Rates with Dark Bremsstrahlung
|
10 pages, 5 figures, 2 tables. v2: minor changes, matches version
published in PRD
|
Phys. Rev. D 96, 023011 (2017)
|
10.1103/PhysRevD.96.023011
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many dark matter interaction types lead to annihilation processes which
suffer from p-wave suppression or helicity suppression, rendering them
subdominant to unsuppressed s-wave processes. We demonstrate that the natural
inclusion of dark initial state radiation can open an unsuppressed s-wave
annihilation channel, and thus provide the dominant dark matter annihilation
process for particular interaction types. We illustrate this effect with the
bremsstrahlung of a dark spin-0 or dark spin-1 particle from fermionic dark
matter, $\overline{\chi}\chi\rightarrow \overline{f}f\phi$ or
$\overline{f}fZ'$. The dark initial state radiation process, despite having a
3-body final state, proceeds at the same order in the new physics scale
$\Lambda$ as the annihilation to the 2-body final state
$\overline{\chi}\chi\rightarrow \overline{f}f$. This is lower order in
$\Lambda$ than the well-studied lifting of helicity suppression via Standard
Model final state radiation, or virtual internal bremsstrahlung. This dark
bremsstrahlung process should influence LHC and indirect detection searches for
dark matter.
|
[
{
"created": "Tue, 2 May 2017 18:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2017 12:19:55 GMT",
"version": "v2"
}
] |
2017-07-28
|
[
[
"Bell",
"Nicole F.",
""
],
[
"Cai",
"Yi",
""
],
[
"Dent",
"James B.",
""
],
[
"Leane",
"Rebecca K.",
""
],
[
"Weiler",
"Thomas J.",
""
]
] |
Many dark matter interaction types lead to annihilation processes which suffer from p-wave suppression or helicity suppression, rendering them subdominant to unsuppressed s-wave processes. We demonstrate that the natural inclusion of dark initial state radiation can open an unsuppressed s-wave annihilation channel, and thus provide the dominant dark matter annihilation process for particular interaction types. We illustrate this effect with the bremsstrahlung of a dark spin-0 or dark spin-1 particle from fermionic dark matter, $\overline{\chi}\chi\rightarrow \overline{f}f\phi$ or $\overline{f}fZ'$. The dark initial state radiation process, despite having a 3-body final state, proceeds at the same order in the new physics scale $\Lambda$ as the annihilation to the 2-body final state $\overline{\chi}\chi\rightarrow \overline{f}f$. This is lower order in $\Lambda$ than the well-studied lifting of helicity suppression via Standard Model final state radiation, or virtual internal bremsstrahlung. This dark bremsstrahlung process should influence LHC and indirect detection searches for dark matter.
|
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