id
stringlengths 9
14
| submitter
stringlengths 1
56
⌀ | authors
stringlengths 5
7.68k
| title
stringlengths 3
299
| comments
stringlengths 1
1.15k
⌀ | journal-ref
stringlengths 9
298
⌀ | doi
stringlengths 12
97
⌀ | report-no
stringlengths 3
341
⌀ | categories
stringclasses 869
values | license
stringclasses 9
values | orig_abstract
stringlengths 16
2.44k
| versions
listlengths 1
39
| update_date
stringlengths 10
10
| authors_parsed
listlengths 1
565
| abstract
stringlengths 13
2.44k
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0412410
|
Serguey Petcov
|
S. T. Petcov
|
Towards Complete Neutrino Mixing Matrix and CP-Violation
|
Somewhat extended version (including additional comments, references
and figure) of the invited plenary talk given at the XXIst International
Conference on Neutrino Physics and Astrophysics, June 14-19, 2004, Paris,
France; 10 pages, 4 figures
| null |
10.1016/j.nuclphysbps.2005.01.101
|
Ref. SISSA 84/2004/EP
|
hep-ph
| null |
The compelling experimental evidences for oscillations of solar, atmospheric
and reactor neutrinos imply the existence of 3-neutrino mixing in vacuum. We
review the phenomenology of 3-neutrino mixing, and the current data on the
3-neutrino mixing parameters. The opened questions and the main goals of future
research in the field of neutrino mixing and oscillations are outlined. A
phenomenological approach for understanding the pattern of neutrino mixing as
an interplay between the mixing, arising from the charged lepton sector, and
bimaximal mixing, arising from a neutrino Majorana mass matrix, is considered
with emphasis on the CP-violating case. We comment also on planned future steps
in the experimental studies of neutrino mixing.
|
[
{
"created": "Wed, 29 Dec 2004 17:34:29 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Petcov",
"S. T.",
""
]
] |
The compelling experimental evidences for oscillations of solar, atmospheric and reactor neutrinos imply the existence of 3-neutrino mixing in vacuum. We review the phenomenology of 3-neutrino mixing, and the current data on the 3-neutrino mixing parameters. The opened questions and the main goals of future research in the field of neutrino mixing and oscillations are outlined. A phenomenological approach for understanding the pattern of neutrino mixing as an interplay between the mixing, arising from the charged lepton sector, and bimaximal mixing, arising from a neutrino Majorana mass matrix, is considered with emphasis on the CP-violating case. We comment also on planned future steps in the experimental studies of neutrino mixing.
|
hep-ph/0007017
|
Pallante
|
Elisabetta Pallante
|
Final State Interactions in $\epsilon'/\epsilon$
|
Talk presented at the XXXVth Rencontres de Moriond on Electroweak
Interactions and Unified Theories, March 2000; 8 pages, 1 eps figure
| null | null | null |
hep-ph
| null |
Strong final state interaction (FSI) effects can play a central role in the
Standard Model prediction of weak $K\to 2\pi$ matrix elements. Here, I discuss
how FSI's affect the direct CP violation parameter $\vepp / \vep$ by solving
the Omn\`es problem for the necessary $K\to 2\pi$ amplitudes. The main results
of this analysis have been reported in a previous paper [1] and are further
discussed in Refs. [2,3]. The resulting Standard Model prediction ${Re} (\vepp
/ \vep) = (15\pm 5)\times 10^{-4}$ is in good agreement with the present
experimental world average.
|
[
{
"created": "Mon, 3 Jul 2000 16:58:18 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pallante",
"Elisabetta",
""
]
] |
Strong final state interaction (FSI) effects can play a central role in the Standard Model prediction of weak $K\to 2\pi$ matrix elements. Here, I discuss how FSI's affect the direct CP violation parameter $\vepp / \vep$ by solving the Omn\`es problem for the necessary $K\to 2\pi$ amplitudes. The main results of this analysis have been reported in a previous paper [1] and are further discussed in Refs. [2,3]. The resulting Standard Model prediction ${Re} (\vepp / \vep) = (15\pm 5)\times 10^{-4}$ is in good agreement with the present experimental world average.
|
2104.04373
|
Rojalin Padhan
|
Genevi\`eve B\'elanger, Sarif Khan, Rojalin Padhan, Manimala Mitra,
Sujay Shil
|
Right Handed Neutrinos, TeV Scale BSM Neutral Higgs and FIMP Dark Matter
in EFT Framework
|
39 pages, 15 figures
|
Phys. Rev. D 104, 055047 (2021)
|
10.1103/PhysRevD.104.055047
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We consider an effective field theory framework with three standard model
(SM) gauge singlet right handed neutrinos, and an additional SM gauge singlet
scalar field. The framework successfully generates eV masses of the light
neutrinos via seesaw mechanism, and accommodates a feebly interacting massive
particle (FIMP) as dark matter candidate. Two of the gauge singlet neutrinos
participate in neutrino mass generation, while the third gauge singlet neutrino
is a FIMP dark matter. We explore the correlation between the $\textit{vev}$ of
the gauge singlet scalar field which translates as mass of the BSM Higgs, and
the mass of dark matter, which arises due to relic density constraint. We
furthermore explore the constraints from the light neutrino masses in this
set-up. We chose the gauge singlet BSM Higgs in this framework in the TeV
scale. We perform a detailed collider analysis to analyse the discovery
prospect of the TeV scale BSM Higgs through its di-fatjet signature, at a
future $pp$ collider which can operate with $\sqrt{s}=100$ TeV c.m.energy.
|
[
{
"created": "Fri, 9 Apr 2021 14:05:36 GMT",
"version": "v1"
}
] |
2021-10-04
|
[
[
"Bélanger",
"Geneviève",
""
],
[
"Khan",
"Sarif",
""
],
[
"Padhan",
"Rojalin",
""
],
[
"Mitra",
"Manimala",
""
],
[
"Shil",
"Sujay",
""
]
] |
We consider an effective field theory framework with three standard model (SM) gauge singlet right handed neutrinos, and an additional SM gauge singlet scalar field. The framework successfully generates eV masses of the light neutrinos via seesaw mechanism, and accommodates a feebly interacting massive particle (FIMP) as dark matter candidate. Two of the gauge singlet neutrinos participate in neutrino mass generation, while the third gauge singlet neutrino is a FIMP dark matter. We explore the correlation between the $\textit{vev}$ of the gauge singlet scalar field which translates as mass of the BSM Higgs, and the mass of dark matter, which arises due to relic density constraint. We furthermore explore the constraints from the light neutrino masses in this set-up. We chose the gauge singlet BSM Higgs in this framework in the TeV scale. We perform a detailed collider analysis to analyse the discovery prospect of the TeV scale BSM Higgs through its di-fatjet signature, at a future $pp$ collider which can operate with $\sqrt{s}=100$ TeV c.m.energy.
|
2212.12136
|
Raphael M. Albuquerque
|
R.M. Albuquerque, S. Narison and D. Rabetiarivony
|
1+ XTZ States within QCD Sum Rules
|
To appear in the proceedings of the 25th High-Energy Physics
International Conference in Quantum Chromodynamics (QCD 22)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present improved estimates of the couplings, masses and mass ratios of the
$X_Q, Z_Q$ and $T_{QQ\bar q\bar q'}$ states using (inverse) QCD Laplace sum
rules (LSR), their ratios ${\cal R}$ and double ratios (DRSR), within stability
criteria. We conclude that the observed $X_c(3872)$ and $Z_c(3900)$ are
tetramoles states (superposition of quasi-degenerated molecule and tetraquark
states having similar couplings to the currents) with the predicted masses:
$M_{{\cal T}_{X_c}}=3876(44)$ MeV and $M_{{\cal T}_{Z_c}}=3900(42)$ MeV. We
also do an extensive analysis of the four-quark nature of different $T_{QQ\bar
q\bar q'}$ axial-vector states. Then, combining ${\cal R}$ and DRSR, we
reanalyze the observed state $X_c(3872)$ and we obtain a precise prediction of
$M_{T_{cc}^{1^+}}$=3886(6) MeV. Extending to the beauty sector, we find the
results: $M_{{\cal T}_{Z_b}}=10579(99)$ MeV and $M_{X_b}=10545(131)$ MeV.
Finally, we confront our combined LSR $\oplus$ DRSR results with the ones from
some other approaches (lattices and quark models).
|
[
{
"created": "Fri, 23 Dec 2022 04:10:51 GMT",
"version": "v1"
}
] |
2022-12-26
|
[
[
"Albuquerque",
"R. M.",
""
],
[
"Narison",
"S.",
""
],
[
"Rabetiarivony",
"D.",
""
]
] |
We present improved estimates of the couplings, masses and mass ratios of the $X_Q, Z_Q$ and $T_{QQ\bar q\bar q'}$ states using (inverse) QCD Laplace sum rules (LSR), their ratios ${\cal R}$ and double ratios (DRSR), within stability criteria. We conclude that the observed $X_c(3872)$ and $Z_c(3900)$ are tetramoles states (superposition of quasi-degenerated molecule and tetraquark states having similar couplings to the currents) with the predicted masses: $M_{{\cal T}_{X_c}}=3876(44)$ MeV and $M_{{\cal T}_{Z_c}}=3900(42)$ MeV. We also do an extensive analysis of the four-quark nature of different $T_{QQ\bar q\bar q'}$ axial-vector states. Then, combining ${\cal R}$ and DRSR, we reanalyze the observed state $X_c(3872)$ and we obtain a precise prediction of $M_{T_{cc}^{1^+}}$=3886(6) MeV. Extending to the beauty sector, we find the results: $M_{{\cal T}_{Z_b}}=10579(99)$ MeV and $M_{X_b}=10545(131)$ MeV. Finally, we confront our combined LSR $\oplus$ DRSR results with the ones from some other approaches (lattices and quark models).
|
hep-ph/9903495
|
Hirotsugu Fujii
|
H.Fujii and D.Kharzeev
|
Long-Range Forces of QCD
|
16pages, 9 eps figures; discussion extended, 2 new references added,
to appear in Phys.Rev.D
|
Phys.Rev. D60 (1999) 114039
|
10.1103/PhysRevD.60.114039
| null |
hep-ph nucl-th
| null |
We consider the scattering of two color dipoles (e.g., heavy quarkonium
states) at low energy - a QCD analog of Van der Waals interaction. Even though
the couplings of the dipoles to the gluon field can be described in
perturbation theory, which leads to the potential proportional to
(N_c^2-1)/R^{7}, at large distances R the interaction becomes totally
non-perturbative. Low-energy QCD theorems are used to evaluate the leading
long-distance contribution \sim (N_f^2-1)/(11N_c - 2N_f)^2 R^{-5/2} exp(-2 \mu
R) (\mu is the Goldstone boson mass), which is shown to arise from the
correlated two-boson exchange. The sum rule which relates the overall strength
of the interaction to the energy density of QCD vacuum is derived.
Surprisingly, we find that when the size of the dipoles shrinks to zero (the
heavy quark limit in the case of quarkonia), the non-perturbative part of the
interaction vanishes more slowly than the perturbative part as a consequence of
scale anomaly. As an application, we evaluate elastic \pi J/\psi and \pi J/\psi
\to \pi \psi' cross sections.
|
[
{
"created": "Thu, 25 Mar 1999 23:44:11 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Aug 1999 01:59:33 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Fujii",
"H.",
""
],
[
"Kharzeev",
"D.",
""
]
] |
We consider the scattering of two color dipoles (e.g., heavy quarkonium states) at low energy - a QCD analog of Van der Waals interaction. Even though the couplings of the dipoles to the gluon field can be described in perturbation theory, which leads to the potential proportional to (N_c^2-1)/R^{7}, at large distances R the interaction becomes totally non-perturbative. Low-energy QCD theorems are used to evaluate the leading long-distance contribution \sim (N_f^2-1)/(11N_c - 2N_f)^2 R^{-5/2} exp(-2 \mu R) (\mu is the Goldstone boson mass), which is shown to arise from the correlated two-boson exchange. The sum rule which relates the overall strength of the interaction to the energy density of QCD vacuum is derived. Surprisingly, we find that when the size of the dipoles shrinks to zero (the heavy quark limit in the case of quarkonia), the non-perturbative part of the interaction vanishes more slowly than the perturbative part as a consequence of scale anomaly. As an application, we evaluate elastic \pi J/\psi and \pi J/\psi \to \pi \psi' cross sections.
|
1004.4853
|
Richard Neufeld Jr.
|
R. B. Neufeld
|
Jets associated with Z^0 boson production in heavy-ion collisions at the
LHC
|
To appear in the proceedings of the 2010 Winter Workshop on Nuclear
Dynamics, which was held in Ocho Rios, Jamaica, mon.
|
J.Phys.Conf.Ser.230:012035,2010
|
10.1088/1742-6596/230/1/012035
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The heavy ion program at the LHC will present unprecedented opportunities to
probe hot QCD matter, that is, the quark gluon plasma (QGP). Among these
exciting new probes are high energy partons associated with the production of a
Z^0 boson, or Z^0 tagged jets. Once produced, Z^0 bosons are essentially
unaffected by the strongly interacting medium produced in heavy-ion collisions,
and therefore provide a powerful signal of the initial partonic energy and
subsequent medium induced partonic energy loss. When compared with theory,
experimental measurements of Z^0 tagged jets will help quantify the jet
quenching properties of the QGP and discriminate between different partonic
energy loss formalisms. In what follows, I discuss the advantages of tagged
jets over leading particles, and present preliminary results of the production
and suppression of Z^0 tagged jets in relativistic heavy-ion collisions at LHC
energies using the Guylassy-Levai-Vitev (GLV) partonic energy loss formalism.
|
[
{
"created": "Tue, 27 Apr 2010 16:22:55 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Neufeld",
"R. B.",
""
]
] |
The heavy ion program at the LHC will present unprecedented opportunities to probe hot QCD matter, that is, the quark gluon plasma (QGP). Among these exciting new probes are high energy partons associated with the production of a Z^0 boson, or Z^0 tagged jets. Once produced, Z^0 bosons are essentially unaffected by the strongly interacting medium produced in heavy-ion collisions, and therefore provide a powerful signal of the initial partonic energy and subsequent medium induced partonic energy loss. When compared with theory, experimental measurements of Z^0 tagged jets will help quantify the jet quenching properties of the QGP and discriminate between different partonic energy loss formalisms. In what follows, I discuss the advantages of tagged jets over leading particles, and present preliminary results of the production and suppression of Z^0 tagged jets in relativistic heavy-ion collisions at LHC energies using the Guylassy-Levai-Vitev (GLV) partonic energy loss formalism.
|
1303.4639
|
Aleksi Kurkela
|
Aleksi Kurkela
|
Thermalization in collisions of large nuclei at high energies
|
8 pages, 4 figures; presentation at Xth Conference on Quark
Confinement and the Hadron Spectrum, 8-12 October 2012, Munich, Germany
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Hydrodynamical analysis of experimental data of ultrarelativistic heavy ion
collisions seems to indicate that the hot QCD matter created in the collisions
thermalizes very quickly. Theoretically, we have no idea why this should be
true. In this proceeding, I will describe how the thermalization takes place in
the most theoretically clean limit -- that of large nuclei at asymptotically
high energy per nucleon, where the system is described by weak-coupling QCD. In
this limit, plasma instabilities dominate the dynamics from immediately after
the collision until well after the plasma becomes nearly in equilibrium at time
t \alpha^(-5/2)Q^(-1).
|
[
{
"created": "Tue, 19 Mar 2013 15:37:41 GMT",
"version": "v1"
}
] |
2013-03-20
|
[
[
"Kurkela",
"Aleksi",
""
]
] |
Hydrodynamical analysis of experimental data of ultrarelativistic heavy ion collisions seems to indicate that the hot QCD matter created in the collisions thermalizes very quickly. Theoretically, we have no idea why this should be true. In this proceeding, I will describe how the thermalization takes place in the most theoretically clean limit -- that of large nuclei at asymptotically high energy per nucleon, where the system is described by weak-coupling QCD. In this limit, plasma instabilities dominate the dynamics from immediately after the collision until well after the plasma becomes nearly in equilibrium at time t \alpha^(-5/2)Q^(-1).
|
1402.1203
|
Evgeny Zhemchugov
|
E. V. Zhemchugov
|
On $Z \to \gamma \gamma$ decay and cancellation of axial anomaly in $Z
\to \gamma \gamma$ transition amplitude for massive fermions
|
11 pages, 4 figures, 2 tables
|
Physics of Atomic Nuclei 77, 11 (2014) 1390
|
10.1134/S1063778814100147
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
$Z \to \gamma \gamma$ decay amplitude is considered and proven to be zero due
to properties of polarization vectors and Bose statistics. Triangular diagrams
for a pseudoscalar $\to \gamma \gamma$ and $Z \to \gamma \gamma$ processes with
massive fermions in the loop are explicitely calculated. In the Standard Model
axial anomaly vanishes in the sum of these diagrams as Z boson is mixed with
one of the Goldstone bosons.
|
[
{
"created": "Tue, 4 Feb 2014 20:07:11 GMT",
"version": "v1"
}
] |
2015-03-17
|
[
[
"Zhemchugov",
"E. V.",
""
]
] |
$Z \to \gamma \gamma$ decay amplitude is considered and proven to be zero due to properties of polarization vectors and Bose statistics. Triangular diagrams for a pseudoscalar $\to \gamma \gamma$ and $Z \to \gamma \gamma$ processes with massive fermions in the loop are explicitely calculated. In the Standard Model axial anomaly vanishes in the sum of these diagrams as Z boson is mixed with one of the Goldstone bosons.
|
hep-ph/9804279
|
Yuichi Chikira
|
Yuichi Chikira, Naoyuki Haba and Yukihiro Mimura
|
The Sliding Singlet Mechanism with Gauge Mediated Supersymmetry Breaking
|
LaTeX 15 pages, no figures, mistakes in Eq.(3.27) crrected, a part of
conclusion corrected
|
Phys. Rev. D 59, 055002 (1999)
|
10.1103/PhysRevD.59.055002
|
TIT-HEP-389, ICRR-Report-415-98-11
|
hep-ph
| null |
The sliding singlet mechanism is one of the most interesting solutions of the
triplet-doublet splitting problem. We analyze this mechanism in the gauge
mediated supersymmetry breaking scenario. We show that the sliding singlet
mechanism does not work in the naive gauge mediation scenario because of the
singlet linear terms derived from the gravity, although $F$ term is much
smaller than the one in the gravity mediation scenario. We also consider the
extension in order for the sliding singlet mechanism to work.
|
[
{
"created": "Mon, 13 Apr 1998 11:10:49 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 1998 07:39:48 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Nov 1998 10:08:11 GMT",
"version": "v3"
}
] |
2016-08-25
|
[
[
"Chikira",
"Yuichi",
""
],
[
"Haba",
"Naoyuki",
""
],
[
"Mimura",
"Yukihiro",
""
]
] |
The sliding singlet mechanism is one of the most interesting solutions of the triplet-doublet splitting problem. We analyze this mechanism in the gauge mediated supersymmetry breaking scenario. We show that the sliding singlet mechanism does not work in the naive gauge mediation scenario because of the singlet linear terms derived from the gravity, although $F$ term is much smaller than the one in the gravity mediation scenario. We also consider the extension in order for the sliding singlet mechanism to work.
|
2407.11731
|
Yu Hamada
|
Minoru Eto, Yu Hamada and Muneto Nitta
|
Tying knots in particle physics
|
14 pages, 4 figures; v2: minor revisions
| null | null |
YGHP-24-06, DESY-24-104
|
hep-ph astro-ph.CO cond-mat.supr-con hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Lord Kelvin's pioneering hypothesis that the identity of atoms is knots of
vortices of the aether had a profound impact on the fields of mathematics and
physics despite being subsequently refuted by experiments. While knot-like
excitations emerge in various systems of condensed matter physics, the
fundamental constituents of matter have been revealed to be elementary
particles such as electrons and quarks, seemingly leaving no room for the
appearance of knots in particle physics. Here, we show that knots indeed appear
as meta-stable solitons in a realistic extension of the standard model of
particle physics that provides the QCD axion and right-handed neutrinos. This
result suggests that during the early Universe, a "knot dominated era" may have
existed, where knots were a dominant component of the Universe, and this
scenario can be tested through gravitational wave observations. Furthermore, we
propose that the end of this era involves the collapse of the knots via quantum
tunneling, leading to the generation of matter-antimatter asymmetry in the
Universe. Our findings exhibit the significant role of knots in particle
physics and represent a modern version of Kelvin's hypothesis.
|
[
{
"created": "Tue, 16 Jul 2024 13:51:02 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Aug 2024 14:51:31 GMT",
"version": "v2"
}
] |
2024-08-06
|
[
[
"Eto",
"Minoru",
""
],
[
"Hamada",
"Yu",
""
],
[
"Nitta",
"Muneto",
""
]
] |
Lord Kelvin's pioneering hypothesis that the identity of atoms is knots of vortices of the aether had a profound impact on the fields of mathematics and physics despite being subsequently refuted by experiments. While knot-like excitations emerge in various systems of condensed matter physics, the fundamental constituents of matter have been revealed to be elementary particles such as electrons and quarks, seemingly leaving no room for the appearance of knots in particle physics. Here, we show that knots indeed appear as meta-stable solitons in a realistic extension of the standard model of particle physics that provides the QCD axion and right-handed neutrinos. This result suggests that during the early Universe, a "knot dominated era" may have existed, where knots were a dominant component of the Universe, and this scenario can be tested through gravitational wave observations. Furthermore, we propose that the end of this era involves the collapse of the knots via quantum tunneling, leading to the generation of matter-antimatter asymmetry in the Universe. Our findings exhibit the significant role of knots in particle physics and represent a modern version of Kelvin's hypothesis.
|
1307.6900
|
Andrea Ferroglia
|
Andrea Ferroglia, Christoph Greub, Alberto Sirlin, and Zhibai Zhang
|
Contributions of the W-boson propagator to muon and tau leptonic decay
rates
|
5 pages
| null |
10.1103/PhysRevD.88.033012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive closed expressions and useful expansions for the contributions of
the tree-level W-boson propagator to the the muon and tau leptonic decay rates.
Calling M and m the masses of the initial and final charged leptons, our
results in the limit m=0 are valid to all orders in M^2/M_W^2. In the terms of
O(m_j^2/M_W^2) (m_j=M,m), our leading corrections, of O(M^2/M_W^2), agree with
the canonical value (3/5) M^2/M_W^2, while the coefficient of our subleading
contributions, of O(m^2/M_W^2), differs from that reported in the recent
literature. A possible explanation of the discrepancy is presented. The
numerical effect of the O(m_j^2/M_W^2) corrections is briefly discussed. A
general expression, valid for arbitrary values of M_W, M and m in the range
M_W>M>m, is given in the Appendix. The paper also contains a review of the
traditional definition and evaluation of the Fermi constant.
|
[
{
"created": "Fri, 26 Jul 2013 00:44:48 GMT",
"version": "v1"
}
] |
2013-08-28
|
[
[
"Ferroglia",
"Andrea",
""
],
[
"Greub",
"Christoph",
""
],
[
"Sirlin",
"Alberto",
""
],
[
"Zhang",
"Zhibai",
""
]
] |
We derive closed expressions and useful expansions for the contributions of the tree-level W-boson propagator to the the muon and tau leptonic decay rates. Calling M and m the masses of the initial and final charged leptons, our results in the limit m=0 are valid to all orders in M^2/M_W^2. In the terms of O(m_j^2/M_W^2) (m_j=M,m), our leading corrections, of O(M^2/M_W^2), agree with the canonical value (3/5) M^2/M_W^2, while the coefficient of our subleading contributions, of O(m^2/M_W^2), differs from that reported in the recent literature. A possible explanation of the discrepancy is presented. The numerical effect of the O(m_j^2/M_W^2) corrections is briefly discussed. A general expression, valid for arbitrary values of M_W, M and m in the range M_W>M>m, is given in the Appendix. The paper also contains a review of the traditional definition and evaluation of the Fermi constant.
|
0808.0523
|
Jonas Mureika
|
J. R. Mureika
|
Differentiating unparticles from extra dimensions via mini black hole
thermodynamics
|
17 pp, LaTeX; 3 figures; Title slightly changed; added discussion of
parton-parton cross sections and implications for unparticle-driven black
holes; To appear in Phys Rev D
|
Phys.Rev.D79:056003,2009
|
10.1103/PhysRevD.79.056003
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A simple method for differentiating two similar accelerator-based black hole
creation mechanisms -- compactified extra dimensions and unparticle-enhanced
gravity -- is discussed, in light of several properties of black hole
thermodynamics. The real-valued scaling dimension $\du$ will induce
interactions that mimic those in a universe with $(2\du-2)$-extra spatial
dimensions, and thus provides an alternative mechanism for black hole creation
at the LHC within the confines of standard 4D general relativity. This results
in mass-dependent Hawking temperature profiles that depend primarily on $\du$,
yielding an evaporation signature unique to the framework. Specifically, a
precision reconstruction of the Hawking temperature spectrum morphology for
black holes of mass $\Mbh$ yields conclusive evidence of one mechanism over the
other, due to the presence of additional adjustable parameters in the
unparticle sector.
|
[
{
"created": "Mon, 4 Aug 2008 22:36:48 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Feb 2009 22:17:11 GMT",
"version": "v2"
}
] |
2009-11-06
|
[
[
"Mureika",
"J. R.",
""
]
] |
A simple method for differentiating two similar accelerator-based black hole creation mechanisms -- compactified extra dimensions and unparticle-enhanced gravity -- is discussed, in light of several properties of black hole thermodynamics. The real-valued scaling dimension $\du$ will induce interactions that mimic those in a universe with $(2\du-2)$-extra spatial dimensions, and thus provides an alternative mechanism for black hole creation at the LHC within the confines of standard 4D general relativity. This results in mass-dependent Hawking temperature profiles that depend primarily on $\du$, yielding an evaporation signature unique to the framework. Specifically, a precision reconstruction of the Hawking temperature spectrum morphology for black holes of mass $\Mbh$ yields conclusive evidence of one mechanism over the other, due to the presence of additional adjustable parameters in the unparticle sector.
|
1201.6368
|
Dmitry Levkov
|
D. G. Levkov, V. A. Rubakov, S. V. Troitsky, Y. A. Zenkevich
|
Constraining holographic technicolor
|
8 pages; journal version
|
Phys.Lett.B716:350-355,2012
|
10.1016/j.physletb.2012.08.038
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We obtain a new bound on the value of Peskin-Takeuchi S parameter in a wide
class of bottom-up holographic models for technicolor. Namely, we show that
weakly coupled holographic description in these models implies S>>0.2. Our
bound is in conflict with the results of electroweak precision measurements, so
it strongly disfavors the models we consider.
|
[
{
"created": "Mon, 30 Jan 2012 21:00:10 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Aug 2012 10:14:44 GMT",
"version": "v2"
}
] |
2012-11-16
|
[
[
"Levkov",
"D. G.",
""
],
[
"Rubakov",
"V. A.",
""
],
[
"Troitsky",
"S. V.",
""
],
[
"Zenkevich",
"Y. A.",
""
]
] |
We obtain a new bound on the value of Peskin-Takeuchi S parameter in a wide class of bottom-up holographic models for technicolor. Namely, we show that weakly coupled holographic description in these models implies S>>0.2. Our bound is in conflict with the results of electroweak precision measurements, so it strongly disfavors the models we consider.
|
hep-ph/0108196
|
Borut Bajc
|
Borut Bajc, Ilia Gogoladze, Ramon Guevara and Goran Senjanovic
|
Flat directions, doublet-triplet splitting, the monopole problem, and
all that
|
Latex, 11 pages, no figures. Improved version, more discussion on
1/M_Pl corrections and unwanted relics, new references
|
Phys.Lett. B525 (2002) 189-194
|
10.1016/S0370-2693(01)01434-4
| null |
hep-ph
| null |
We discuss a supersymmetric SU(6) grand unified theory with the GUT flat
direction being lifted by soft supersymmetry breaking, and the doublet-triplet
splitting being achieved with Higgs as a pseudo-Goldstone boson. The theory
offers a simple solution to the false vacuum and monopole problems.
|
[
{
"created": "Thu, 23 Aug 2001 16:46:51 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2001 12:57:59 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Bajc",
"Borut",
""
],
[
"Gogoladze",
"Ilia",
""
],
[
"Guevara",
"Ramon",
""
],
[
"Senjanovic",
"Goran",
""
]
] |
We discuss a supersymmetric SU(6) grand unified theory with the GUT flat direction being lifted by soft supersymmetry breaking, and the doublet-triplet splitting being achieved with Higgs as a pseudo-Goldstone boson. The theory offers a simple solution to the false vacuum and monopole problems.
|
hep-ph/9605351
|
Steve Mrenna
|
G.L. Kane (Univ. of Mich.) and S. Mrenna (Argonne)
|
Do About Half the Top Quarks at FNAL Come From Gluino Decays?
|
18 pages, including 4 Postscript figures, uses epsf.tex, also
available at http://www.hep.anl.gov/theory/mrenna/
|
Phys.Rev.Lett.77:3502-3505,1996
|
10.1103/PhysRevLett.77.3502
|
ANL-HEP-PR-96-43, UM-TH-96-06
|
hep-ph
| null |
We argue that it is possible to make a consistent picture of FNAL data
including the production and decay of gluinos and squarks. The additional cross
section is several pb, about the size of that for Standard Model (SM) top quark
pair production. If the stop squark mass is small enough, about half of the top
quarks decay to stop squarks, and the loss of SM top quark pair production rate
is compensated by the supersymmetric processes. This behavior is consistent
with the reported top quark decay rates in various modes and other aspects of
the data, and suggests several other possible decay signatures. This picture
can be tested easily with more data, perhaps even with the data in hand, and
demonstrates the potential power of a hadron collider to determine
supersymmetric parameters. It also has implications for the top mass
measurement and the interpretation of the LEP $R_b$ excess.
|
[
{
"created": "Sun, 19 May 1996 21:08:32 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Kane",
"G. L.",
"",
"Univ. of Mich."
],
[
"Mrenna",
"S.",
"",
"Argonne"
]
] |
We argue that it is possible to make a consistent picture of FNAL data including the production and decay of gluinos and squarks. The additional cross section is several pb, about the size of that for Standard Model (SM) top quark pair production. If the stop squark mass is small enough, about half of the top quarks decay to stop squarks, and the loss of SM top quark pair production rate is compensated by the supersymmetric processes. This behavior is consistent with the reported top quark decay rates in various modes and other aspects of the data, and suggests several other possible decay signatures. This picture can be tested easily with more data, perhaps even with the data in hand, and demonstrates the potential power of a hadron collider to determine supersymmetric parameters. It also has implications for the top mass measurement and the interpretation of the LEP $R_b$ excess.
|
hep-ph/9710536
|
V. V. Gubin
|
N.N.Achasov and V.V.Gubin (S.L.Sobolev Institute for Mathematics,
Novosibirsk)
|
Search for the scalar a_0 and f_0 mesons in the \phi radiative decays
|
Talk given at HADRON-97
| null |
10.1063/1.55972
| null |
hep-ph hep-ex
| null |
The potentialities of the production of the $a_0$ and $f_0$ mesons in the
$\phi$ radiative decays are considered based on a new two-channel analysis of
the $\pi\pi$ scattering in a energy region near 1 GeV. We predict
$BR(\phi\to\gamma f_0(980))\sim10^{-5}-10^{-4}$ that is a great value for the
decay forbidden by the Okubo-Zweig-Iizuka rule. We discuss the four-quark,
$K\bar K$-molecule and two-quark scenarios for the $a_0$ and $f_0$ mesons. It
is presented arguments that the $e^+e^-$-colliders and especially the $\phi$
factories give the possibility to choose a single one out of them.
|
[
{
"created": "Thu, 30 Oct 1997 04:32:11 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Achasov",
"N. N.",
"",
"S.L.Sobolev Institute for Mathematics,\n Novosibirsk"
],
[
"Gubin",
"V. V.",
"",
"S.L.Sobolev Institute for Mathematics,\n Novosibirsk"
]
] |
The potentialities of the production of the $a_0$ and $f_0$ mesons in the $\phi$ radiative decays are considered based on a new two-channel analysis of the $\pi\pi$ scattering in a energy region near 1 GeV. We predict $BR(\phi\to\gamma f_0(980))\sim10^{-5}-10^{-4}$ that is a great value for the decay forbidden by the Okubo-Zweig-Iizuka rule. We discuss the four-quark, $K\bar K$-molecule and two-quark scenarios for the $a_0$ and $f_0$ mesons. It is presented arguments that the $e^+e^-$-colliders and especially the $\phi$ factories give the possibility to choose a single one out of them.
|
hep-ph/0404032
|
Ming-Qiu Huang
|
Ming-Qiu Huang (NUDT, Hunan)
|
Exclusive semileptonic B_s decays to excited D_s mesons: Search of
D_{sJ}(2317) and D_{sJ}(2460)
|
15 pages, 6 eps figures, RevTeX 4, accepted for publication in Phys.
Rev. D
|
Phys.Rev. D69 (2004) 114015
|
10.1103/PhysRevD.69.114015
| null |
hep-ph
| null |
We study the exclusive semileptonic decays B_s->D_{s0}^*\ell\bar\nu and
B_s->D_{s1}^*\ell\bar\nu, where p-wave excited D_{s0}^* and D_{s1}^* states are
identified with the newly observed D_{sJ}(2317) and D_{sJ}(2460) states. Within
the framework of HQET the Isgur-Wise functions up to the subleading order of
the heavy quark expansion are calculated by QCD sum rules. The decay rates and
branching ratios are computed with the inclusion of the order of 1/m_Q
corrections. We point out that the investigation of the B_s semileptonic decays
to excited D_s mesons may provide some information about the nature of the new
D_{sJ}^* mesons.
|
[
{
"created": "Sat, 3 Apr 2004 18:02:49 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Huang",
"Ming-Qiu",
"",
"NUDT, Hunan"
]
] |
We study the exclusive semileptonic decays B_s->D_{s0}^*\ell\bar\nu and B_s->D_{s1}^*\ell\bar\nu, where p-wave excited D_{s0}^* and D_{s1}^* states are identified with the newly observed D_{sJ}(2317) and D_{sJ}(2460) states. Within the framework of HQET the Isgur-Wise functions up to the subleading order of the heavy quark expansion are calculated by QCD sum rules. The decay rates and branching ratios are computed with the inclusion of the order of 1/m_Q corrections. We point out that the investigation of the B_s semileptonic decays to excited D_s mesons may provide some information about the nature of the new D_{sJ}^* mesons.
|
0801.0036
|
Adrian Palcu
|
Adrian Palcu
|
Charged and Neutral Currents in a 3-3-1 Model with Right-Handed
Neutrinos
|
14 pages, 1 Table, no figures
|
Mod.Phys.Lett. A23 (2008) 387-399
|
10.1142/S0217732308026509
| null |
hep-ph
| null |
The charged and the neutral currents are obtained by using a formal
algebraical approach (developed and applied by the author) within the exact
solution of a 3-3-1 gauge model with right-handed neutrinos. The entire
Standard Model phenomenology is recovered without imposing any supplemental
condition, but only by choosing an adecquate set of parameters from the very
beginning of the calculus. A new and rich phenomenology regarding the particles
and their currents occurs as well. The appealing feature of our results resides
in the exact expressions of the currents which need not the adjustment usually
due to the small mixing angle $\phi$ between neutral bosons $Z$ and
$Z^{\prime}$ (like in the most of the papers in the literature treating the
same issue). The required mixing was considered and aleready performed as an
intermediate step by the solving method itself, since the physical eigenstates
of those bosons were determined and then identified in the neutral currents.
|
[
{
"created": "Sat, 29 Dec 2007 08:26:32 GMT",
"version": "v1"
}
] |
2009-02-24
|
[
[
"Palcu",
"Adrian",
""
]
] |
The charged and the neutral currents are obtained by using a formal algebraical approach (developed and applied by the author) within the exact solution of a 3-3-1 gauge model with right-handed neutrinos. The entire Standard Model phenomenology is recovered without imposing any supplemental condition, but only by choosing an adecquate set of parameters from the very beginning of the calculus. A new and rich phenomenology regarding the particles and their currents occurs as well. The appealing feature of our results resides in the exact expressions of the currents which need not the adjustment usually due to the small mixing angle $\phi$ between neutral bosons $Z$ and $Z^{\prime}$ (like in the most of the papers in the literature treating the same issue). The required mixing was considered and aleready performed as an intermediate step by the solving method itself, since the physical eigenstates of those bosons were determined and then identified in the neutral currents.
|
1711.10410
|
Tommi Alanne
|
Tommi Alanne, Diogo Buarque Franzosi, Mads T. Frandsen, Mette L.A.
Kristensen, Aurora Meroni, Martin Rosenlyst
|
Partially composite Higgs models: Phenomenology and RG analysis
|
24 pages, 11 figures. v2 matches the published version
|
JHEP1801 (2018) 051
|
10.1007/JHEP01(2018)051
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the phenomenology of partially composite-Higgs models where
electroweak symmetry breaking is dynamically induced, and the Higgs is a
mixture of a composite and an elementary state. The models considered have
explicit realizations in terms of gauge-Yukawa theories with new strongly
interacting fermions coupled to elementary scalars and allow for a very SM-like
Higgs state. We study constraints on their parameter spaces from vacuum
stability and perturbativity as well as from LHC results and find that
requiring vacuum stability up to the compositeness scale already imposes
relevant constraints. A small part of parameter space around the classically
conformal limit is stable up to the Planck scale. This is however already
strongly disfavored by LHC results. In different limits, the models realize
both (partially) composite-Higgs and (bosonic) technicolor models and a
dynamical extension of the fundamental Goldstone-Higgs model. Therefore, they
provide a general framework for exploring the phenomenology of composite
dynamics.
|
[
{
"created": "Tue, 28 Nov 2017 17:09:59 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jan 2018 12:57:58 GMT",
"version": "v2"
}
] |
2018-02-14
|
[
[
"Alanne",
"Tommi",
""
],
[
"Franzosi",
"Diogo Buarque",
""
],
[
"Frandsen",
"Mads T.",
""
],
[
"Kristensen",
"Mette L. A.",
""
],
[
"Meroni",
"Aurora",
""
],
[
"Rosenlyst",
"Martin",
""
]
] |
We study the phenomenology of partially composite-Higgs models where electroweak symmetry breaking is dynamically induced, and the Higgs is a mixture of a composite and an elementary state. The models considered have explicit realizations in terms of gauge-Yukawa theories with new strongly interacting fermions coupled to elementary scalars and allow for a very SM-like Higgs state. We study constraints on their parameter spaces from vacuum stability and perturbativity as well as from LHC results and find that requiring vacuum stability up to the compositeness scale already imposes relevant constraints. A small part of parameter space around the classically conformal limit is stable up to the Planck scale. This is however already strongly disfavored by LHC results. In different limits, the models realize both (partially) composite-Higgs and (bosonic) technicolor models and a dynamical extension of the fundamental Goldstone-Higgs model. Therefore, they provide a general framework for exploring the phenomenology of composite dynamics.
|
1806.02593
|
Stephen Jones
|
S. P. Jones, B. Ruijl
|
Numerical Methods and the 4-point 2-loop Higgs amplitudes
|
8 pages, 2 figures. To appear in the proceedings of `ACAT 2017',
Seattle (USA), August 2017
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Some of the difficulties faced when calculating multi-loop amplitudes with
several mass scales are reviewed. We then focus on one particular difficulty,
the evaluation of the Feynman integrals, and introduce the program pySecDec
which can be used to numerically compute such integrals. Some of the new
features and in particular the sector symmetry finder, which can help to reduce
the number of sectors to be numerically integrated after sector decomposition,
are described.
|
[
{
"created": "Thu, 7 Jun 2018 10:01:58 GMT",
"version": "v1"
}
] |
2018-06-08
|
[
[
"Jones",
"S. P.",
""
],
[
"Ruijl",
"B.",
""
]
] |
Some of the difficulties faced when calculating multi-loop amplitudes with several mass scales are reviewed. We then focus on one particular difficulty, the evaluation of the Feynman integrals, and introduce the program pySecDec which can be used to numerically compute such integrals. Some of the new features and in particular the sector symmetry finder, which can help to reduce the number of sectors to be numerically integrated after sector decomposition, are described.
|
2306.17247
|
Roberto A. Morales
|
R. A. Morales
|
Exploring Bell inequalities and quantum entanglement in vector boson
scattering
|
17 pages + 4 appendices with 11 captioned figures. Discussion and
references added. Results are unchanged
| null | null | null |
hep-ph quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Quantum properties of vector boson scattering $V'_1V'_2\to V_1 V_2$, related
to entanglement and violation of Bell inequalities, are explored in this paper.
The analysis is based on the construction of the polarization density matrix
associated to the final state $V_1V_2$ by means of the computation of the
corresponding tree level amplitudes within the Standard Model. The aim of this
work is to determine the regions of the phase space where the final vector
bosons after the scattering result entangled and if is it possible to test the
Bell inequalities in those regions. We found that in all cases the entanglement
is present. The amount of it depends on the process and the Maximally Entangled
state is reached in some particular channels. Concerning the Bell inequality,
it could be also tested in certain kinematical regions for some of these
processes. This work is a first step in the analysis of these quantum
properties for this kind of processes and it is postponed for future studies
the reconstruction of the polarization density matrix and the related quantum
parameters from experimental data through Monte-Carlo simulations using quantum
tomography techniques.
|
[
{
"created": "Thu, 29 Jun 2023 18:29:31 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2023 20:57:01 GMT",
"version": "v2"
}
] |
2023-08-31
|
[
[
"Morales",
"R. A.",
""
]
] |
Quantum properties of vector boson scattering $V'_1V'_2\to V_1 V_2$, related to entanglement and violation of Bell inequalities, are explored in this paper. The analysis is based on the construction of the polarization density matrix associated to the final state $V_1V_2$ by means of the computation of the corresponding tree level amplitudes within the Standard Model. The aim of this work is to determine the regions of the phase space where the final vector bosons after the scattering result entangled and if is it possible to test the Bell inequalities in those regions. We found that in all cases the entanglement is present. The amount of it depends on the process and the Maximally Entangled state is reached in some particular channels. Concerning the Bell inequality, it could be also tested in certain kinematical regions for some of these processes. This work is a first step in the analysis of these quantum properties for this kind of processes and it is postponed for future studies the reconstruction of the polarization density matrix and the related quantum parameters from experimental data through Monte-Carlo simulations using quantum tomography techniques.
|
1210.3826
|
Brett D. Altschul
|
Alejandro Ferrero, Brett Altschul
|
Quantum Effects of a Spacetime Varying alpha on the Propagation of
Electrically Charged Fermions
|
12 pages
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A spacetime-varying fine structure constant alpha(x^mu) could generate
quantum corrections in some of the coefficients of the Lorentz-violating
standard model extension (SME) associated with electrically charged fermions.
The quantum corrections depend on d_mu alpha, the spacetime gradient of the
fine structure constant. Lorentz-violating operators involving fermions arise
from the one-loop corrections to the quantum electrodynamics (QED) vertex
function and fermion self-energy. Both g^(lambda mu nu) and c^(mu nu) terms are
generated, at O(d_mu alpha) and O[(d_mu alpha)^2], respectively. The g^(lambda
mu nu) terms so generated are different in the vertex and self-energy, which
represents a radiatively induced violation of gauge invariance.
|
[
{
"created": "Sun, 14 Oct 2012 19:27:26 GMT",
"version": "v1"
}
] |
2012-10-16
|
[
[
"Ferrero",
"Alejandro",
""
],
[
"Altschul",
"Brett",
""
]
] |
A spacetime-varying fine structure constant alpha(x^mu) could generate quantum corrections in some of the coefficients of the Lorentz-violating standard model extension (SME) associated with electrically charged fermions. The quantum corrections depend on d_mu alpha, the spacetime gradient of the fine structure constant. Lorentz-violating operators involving fermions arise from the one-loop corrections to the quantum electrodynamics (QED) vertex function and fermion self-energy. Both g^(lambda mu nu) and c^(mu nu) terms are generated, at O(d_mu alpha) and O[(d_mu alpha)^2], respectively. The g^(lambda mu nu) terms so generated are different in the vertex and self-energy, which represents a radiatively induced violation of gauge invariance.
|
0810.1230
|
Tobias Huber
|
M. Beneke (RWTH Aachen University, University of Zurich), T. Huber
(RWTH Aachen University), Xin-Qiang Li (RWTH Aachen University)
|
Two-loop QCD correction to differential semi-leptonic b --> u decays in
the shape-function region
|
24 pages, 4 figures. Properly MSbar-renormalized coefficient
functions introduced. Matches published version
|
Nucl.Phys.B811:77-97,2009
|
10.1016/j.nuclphysb.2008.11.019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the two-loop QCD correction to the form factors of on-shell
b-quark decay to an energetic massless quark, which constitutes the last
missing piece required for an O(alpha_s^2) determination of |V_ub| from
inclusive semi-leptonic \bar B --> X_u l nu decays in the shape-function
region.
|
[
{
"created": "Tue, 7 Oct 2008 16:09:05 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2008 21:02:59 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Beneke",
"M.",
"",
"RWTH Aachen University, University of Zurich"
],
[
"Huber",
"T.",
"",
"RWTH Aachen University"
],
[
"Li",
"Xin-Qiang",
"",
"RWTH Aachen University"
]
] |
We calculate the two-loop QCD correction to the form factors of on-shell b-quark decay to an energetic massless quark, which constitutes the last missing piece required for an O(alpha_s^2) determination of |V_ub| from inclusive semi-leptonic \bar B --> X_u l nu decays in the shape-function region.
|
1712.06539
|
Felix Kling
|
Felix Kling, Arvind Rajaraman
|
On Profiles of Boson Stars with Self-Interactions
|
13 pages, Version 2: updated after accepted by journal, references
updated, minor changes
|
Phys. Rev. D 97, 063012 (2018)
|
10.1103/PhysRevD.97.063012
|
UCI-HEP-TR-2017-17
|
hep-ph astro-ph.GA gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Under the influence of gravity, light scalar fields can form bound compact
objects called boson stars. We use the technique of matching asymptotic
expansions to obtain the profile for boson stars where the constituent
particles have self-interactions. We obtain parametric representations of these
profiles as a function of the self-interactions, including the case of very
strong self-interactions. We show that our methods agree with solutions
obtained by purely numerical methods. Significant distortions are found as
compared to the noninteracting case.
|
[
{
"created": "Mon, 18 Dec 2017 17:25:57 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jun 2018 19:24:06 GMT",
"version": "v2"
}
] |
2018-06-19
|
[
[
"Kling",
"Felix",
""
],
[
"Rajaraman",
"Arvind",
""
]
] |
Under the influence of gravity, light scalar fields can form bound compact objects called boson stars. We use the technique of matching asymptotic expansions to obtain the profile for boson stars where the constituent particles have self-interactions. We obtain parametric representations of these profiles as a function of the self-interactions, including the case of very strong self-interactions. We show that our methods agree with solutions obtained by purely numerical methods. Significant distortions are found as compared to the noninteracting case.
|
1512.09202
|
Manimala Mitra
|
Arnab Dasgupta, Manimala Mitra and Debasish Borah
|
Minimal Left-Right Symmetry Confronted with the 750 GeV Di-photon Excess
at LHC
|
19 pages, 5 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent results of 13 TeV ATLAS and CMS di-photon searches show an excess
at di-photon invariant mass of 750 GeV. We look for possible explanation of
this within minimal left right symmetric model (MLRSM). The possible candidate
is a neutral Higgs of mass 750 GeV that can decay to di-photon via charged
Higgs and right handed gauge boson loop. However, the cross-section is not
consistent with the ATLAS and CMS results. We then discuss one possible
variation of this model with universal seesaw for fermion masses that can
explain this excess.
|
[
{
"created": "Thu, 31 Dec 2015 02:55:20 GMT",
"version": "v1"
}
] |
2016-01-01
|
[
[
"Dasgupta",
"Arnab",
""
],
[
"Mitra",
"Manimala",
""
],
[
"Borah",
"Debasish",
""
]
] |
The recent results of 13 TeV ATLAS and CMS di-photon searches show an excess at di-photon invariant mass of 750 GeV. We look for possible explanation of this within minimal left right symmetric model (MLRSM). The possible candidate is a neutral Higgs of mass 750 GeV that can decay to di-photon via charged Higgs and right handed gauge boson loop. However, the cross-section is not consistent with the ATLAS and CMS results. We then discuss one possible variation of this model with universal seesaw for fermion masses that can explain this excess.
|
2001.06042
|
Jui-Lin Kuo
|
Xiaoyong Chu, Jui-Lin Kuo, Josef Pradler
|
Dark sector-photon interactions in proton-beam experiments
|
17 pages, 7 figures, to match the published version
|
Phys. Rev. D 101, 075035 (2020)
|
10.1103/PhysRevD.101.075035
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider electromagnetically neutral dark states that couple to the photon
through higher dimensional effective operators, such as electric and magnetic
dipole moment, anapole moment and charge radius operators. We investigate the
possibility of probing the existence of such dark states, taking a Dirac
fermion $\chi$ as an example, at several representative proton-beam
experiments. As no positive signal has been reported, we obtain upper limits
(or projected sensitivities) on the corresponding electromagnetic form factors
for dark states lighter than several GeV. We demonstrate that while the current
limits from proton-beam experiments are at most comparable with those from
high-energy electron colliders, future experiments, such as DUNE and SHiP, will
be able to improve the sensitivities to electric and magnetic dipole moment
interactions, owing to their high intensity.
|
[
{
"created": "Thu, 16 Jan 2020 19:26:40 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2020 19:42:49 GMT",
"version": "v2"
}
] |
2020-04-20
|
[
[
"Chu",
"Xiaoyong",
""
],
[
"Kuo",
"Jui-Lin",
""
],
[
"Pradler",
"Josef",
""
]
] |
We consider electromagnetically neutral dark states that couple to the photon through higher dimensional effective operators, such as electric and magnetic dipole moment, anapole moment and charge radius operators. We investigate the possibility of probing the existence of such dark states, taking a Dirac fermion $\chi$ as an example, at several representative proton-beam experiments. As no positive signal has been reported, we obtain upper limits (or projected sensitivities) on the corresponding electromagnetic form factors for dark states lighter than several GeV. We demonstrate that while the current limits from proton-beam experiments are at most comparable with those from high-energy electron colliders, future experiments, such as DUNE and SHiP, will be able to improve the sensitivities to electric and magnetic dipole moment interactions, owing to their high intensity.
|
hep-ph/0611090
|
Reinhard Alkofer
|
Reinhard Alkofer
|
QCD Green Functions and their Application to Hadron Physics
|
21 pages, 32 figures; lectures presented at the conference ``Infrared
QCD in Rio: Propagators, Condensates and Topological Effects (IRQCD 2006)'',
Rio de Janeiro, Brazil, 5-9 Jun 2006; a few typos corrected (no other
changes)
|
Braz.J.Phys.37:144-164,2007
| null | null |
hep-ph
| null |
In a functional approach to QCD the infrared behaviour of Landau gauge Green
functions is investigated. It can be proven that the ghost Dyson-Schwinger
equation implies the Gribov-Zwanziger horizon condition. Its relation to the
Kugo-Ojima confinement scenario is elucidated. Positivity violation for gluons
is demonstrated, and the analytic structure of the gluon propagator is studied.
Quark confinement is related to an infrared divergence of the quark-gluon
vertex. It is shown that in the latter various components are non-vanishing due
to the dynamical breaking of chiral symmetry. As a result an infrared finite
running coupling in the Yang-Mills sector is derived whereas the running
coupling related to the quark-gluon vertex is infrared divergent.
In Coulomb gauge QCD already the one-gluon-exchange (over-)confines. This
leads to a vanishing quark propagator, and thus quarks are confined.
Nevertheless colour singlet quantities derived from the quark propagator are
well-defined. Especially the expression for the quark condensate proves that
chiral symmetry is dynamically broken. As expected the properties of mesons can
be directly calculated whereas the mass of coloured diquarks diverges, and thus
diquarks are confined. The latter nevertheless possess a well-defined size.
In the third part the results obtained so far will be used to formulate a
covariant Faddeev approach to nucleons. The resulting amplitudes describe the
quark core of the nucleon. Besides the mass of this state also the
electromagnetic form factors are calculated. The results for charge radii and
magnetic moments as a function of the quark current mass provide some
indication what the missing pion cloud may contribute to the nucleons'
properties.
|
[
{
"created": "Tue, 7 Nov 2006 22:17:39 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Apr 2007 14:59:12 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Alkofer",
"Reinhard",
""
]
] |
In a functional approach to QCD the infrared behaviour of Landau gauge Green functions is investigated. It can be proven that the ghost Dyson-Schwinger equation implies the Gribov-Zwanziger horizon condition. Its relation to the Kugo-Ojima confinement scenario is elucidated. Positivity violation for gluons is demonstrated, and the analytic structure of the gluon propagator is studied. Quark confinement is related to an infrared divergence of the quark-gluon vertex. It is shown that in the latter various components are non-vanishing due to the dynamical breaking of chiral symmetry. As a result an infrared finite running coupling in the Yang-Mills sector is derived whereas the running coupling related to the quark-gluon vertex is infrared divergent. In Coulomb gauge QCD already the one-gluon-exchange (over-)confines. This leads to a vanishing quark propagator, and thus quarks are confined. Nevertheless colour singlet quantities derived from the quark propagator are well-defined. Especially the expression for the quark condensate proves that chiral symmetry is dynamically broken. As expected the properties of mesons can be directly calculated whereas the mass of coloured diquarks diverges, and thus diquarks are confined. The latter nevertheless possess a well-defined size. In the third part the results obtained so far will be used to formulate a covariant Faddeev approach to nucleons. The resulting amplitudes describe the quark core of the nucleon. Besides the mass of this state also the electromagnetic form factors are calculated. The results for charge radii and magnetic moments as a function of the quark current mass provide some indication what the missing pion cloud may contribute to the nucleons' properties.
|
2303.02071
|
CaiChang Li
|
Gui-Jun Ding, Stephen F. King, Cai-Chang Li, Xiang-Gan Liu, Jun-Nan Lu
|
Neutrino Mass and Mixing Models with Eclectic Flavor Symmetry $\Delta
(27) \rtimes T'$
|
47 pages, 2 figures
| null |
10.1007/JHEP05(2023)144
|
UCI-TR-2022-29
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The K\"ahler potentials of modular symmetry models receive unsuppressed
contributions which may be controlled by a flavor symmetry, where the
combination of the two symmetry types is referred to as eclectic flavor
symmetry. After briefly reviewing the consistency conditions of eclectic flavor
symmetry models, including with generalised (g)CP, we perform a comprehensive
bottom-up study of eclectic flavor symmetry models based on $\Omega(1)\cong
\Delta(27)\rtimes T^\prime$, consisting of the flavor symmetry $\Delta(27)$ in
a semi-direct product with the modular symmetry $T^\prime$. The modular
transformations of different $\Delta(27)$ multiplets are given by solving the
consistency condition. The eight nontrivial singlets of $\Delta(27)$ are
related by $T'$ modular symmetry, and they have to be present or absent
simultaneously in any $\Omega(1)$ model. The most general forms of the
superpotential and K\"ahler potential invariant under $\Omega(1)$ are
discussed, and the corresponding fermion mass matrices are presented. Based on
the eclectic flavor group $\Omega(1)$, two concrete lepton models which can
successfully describe the experimental data of lepton masses and mixing
parameters are constructed. For the two models without gCP, all six mixing
parameters vary in small regions. A nearly maximal atmospheric mixing angle
$\theta_{23}$ and Dirac CP phase $\delta_{CP}$ are obtained in the first model.
After considering the compatible gCP symmetry and the assumption of $\Re
\tau=0$ in the first model, the $\mu-\tau$ reflection symmetry is preserved in
the charged lepton diagonal basis. As a consequence, the atmospheric mixing
angle and Dirac CP phase are predicted to be maximal, and two Majorana CP
phases are predicted to be $\pi$.
|
[
{
"created": "Fri, 3 Mar 2023 16:39:20 GMT",
"version": "v1"
}
] |
2023-06-07
|
[
[
"Ding",
"Gui-Jun",
""
],
[
"King",
"Stephen F.",
""
],
[
"Li",
"Cai-Chang",
""
],
[
"Liu",
"Xiang-Gan",
""
],
[
"Lu",
"Jun-Nan",
""
]
] |
The K\"ahler potentials of modular symmetry models receive unsuppressed contributions which may be controlled by a flavor symmetry, where the combination of the two symmetry types is referred to as eclectic flavor symmetry. After briefly reviewing the consistency conditions of eclectic flavor symmetry models, including with generalised (g)CP, we perform a comprehensive bottom-up study of eclectic flavor symmetry models based on $\Omega(1)\cong \Delta(27)\rtimes T^\prime$, consisting of the flavor symmetry $\Delta(27)$ in a semi-direct product with the modular symmetry $T^\prime$. The modular transformations of different $\Delta(27)$ multiplets are given by solving the consistency condition. The eight nontrivial singlets of $\Delta(27)$ are related by $T'$ modular symmetry, and they have to be present or absent simultaneously in any $\Omega(1)$ model. The most general forms of the superpotential and K\"ahler potential invariant under $\Omega(1)$ are discussed, and the corresponding fermion mass matrices are presented. Based on the eclectic flavor group $\Omega(1)$, two concrete lepton models which can successfully describe the experimental data of lepton masses and mixing parameters are constructed. For the two models without gCP, all six mixing parameters vary in small regions. A nearly maximal atmospheric mixing angle $\theta_{23}$ and Dirac CP phase $\delta_{CP}$ are obtained in the first model. After considering the compatible gCP symmetry and the assumption of $\Re \tau=0$ in the first model, the $\mu-\tau$ reflection symmetry is preserved in the charged lepton diagonal basis. As a consequence, the atmospheric mixing angle and Dirac CP phase are predicted to be maximal, and two Majorana CP phases are predicted to be $\pi$.
|
2404.08049
|
Claudio Severi
|
Fabio Maltoni, Claudio Severi, Simone Tentori, Eleni Vryonidou
|
Quantum tops at circular lepton colliders
|
33 pages plus Appendix, 16 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We study the quantum properties of top quark pairs in lepton colliders with
unpolarised beams, including spin correlations, entanglement, and violation of
Bell inequalities. We present analytical results in the SM and in the SMEFT and
discuss several practical aspects, like the choice of quantization axes and $t
\bar t$ threshold effects. We also note a correspondence between parity
symmetry and entanglement. We find that quantum observables exhibit a rich
phenomenology in the SM, and can also provide additional leverage in detecting
new physics residing at higher scales.
|
[
{
"created": "Thu, 11 Apr 2024 18:00:03 GMT",
"version": "v1"
}
] |
2024-04-15
|
[
[
"Maltoni",
"Fabio",
""
],
[
"Severi",
"Claudio",
""
],
[
"Tentori",
"Simone",
""
],
[
"Vryonidou",
"Eleni",
""
]
] |
We study the quantum properties of top quark pairs in lepton colliders with unpolarised beams, including spin correlations, entanglement, and violation of Bell inequalities. We present analytical results in the SM and in the SMEFT and discuss several practical aspects, like the choice of quantization axes and $t \bar t$ threshold effects. We also note a correspondence between parity symmetry and entanglement. We find that quantum observables exhibit a rich phenomenology in the SM, and can also provide additional leverage in detecting new physics residing at higher scales.
|
hep-ph/9810369
|
Keum Yong-Yeon
|
Y.-Y. Keum
|
Decay Constants $f_{D_s^*}$ and $f_{D_s}$ from ${\bar{B}}^0\to D^+ l^-
{\bar{\nu}}$ and ${\bar{B}}^0\to D^+ D_s^{-(*)}$ Decays
|
17 pages, no figure
| null | null |
APCTP/98-22, KEK-TH-594
|
hep-ph
| null |
We calculate the decay constant of $D_s$ and $D_s^{*}$ with $\bar{B}^0 \ra
D^{+}\ell^{-}\nu$ and $\bar{B}^0 \ra D^{+}D_s^{-(*)}$ decays. In our analysis
we assume that factorization ansatz works and used two different form factor
behaviours (constant and monopole-type) for $F_0(q^2)$. We also consider the
QCD-penguin contributions in hadronic decays within the NDR renormalization
scheme at NLO calculation.
We estimate the decay constant of the $D_s$ meson to be $219\pm46 MeV$ for
(pole/pole)-type form factor and $239\pm50$ $MeV$ for (pole/constant)-type form
factor. For $D_s^{*}$ meson, we predict $f_{D_s^{*}} = 336 \pm 79 MeV$, and
$f_{D_s^{*}}/f_{D_s} = 1.41 \pm 0.41$ for (pole/constant)-type form factor.
|
[
{
"created": "Thu, 15 Oct 1998 11:43:35 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Oct 1998 16:02:30 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Keum",
"Y. -Y.",
""
]
] |
We calculate the decay constant of $D_s$ and $D_s^{*}$ with $\bar{B}^0 \ra D^{+}\ell^{-}\nu$ and $\bar{B}^0 \ra D^{+}D_s^{-(*)}$ decays. In our analysis we assume that factorization ansatz works and used two different form factor behaviours (constant and monopole-type) for $F_0(q^2)$. We also consider the QCD-penguin contributions in hadronic decays within the NDR renormalization scheme at NLO calculation. We estimate the decay constant of the $D_s$ meson to be $219\pm46 MeV$ for (pole/pole)-type form factor and $239\pm50$ $MeV$ for (pole/constant)-type form factor. For $D_s^{*}$ meson, we predict $f_{D_s^{*}} = 336 \pm 79 MeV$, and $f_{D_s^{*}}/f_{D_s} = 1.41 \pm 0.41$ for (pole/constant)-type form factor.
|
0805.4245
|
Fuminobu Takahashi
|
Shinta Kasuya, Masahiro Kawasaki, Fuminobu Takahashi
|
Isocurvature fluctuations in Affleck-Dine mechanism and constraints on
inflation models
|
18 pages, 1 figure
|
JCAP 0810:017,2008
|
10.1088/1475-7516/2008/10/017
|
IPMU 08-0032
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We reconsider the Affleck-Dine mechanism for baryogenesis and show that the
baryonic isocurvature fluctuations are generated in many inflation models in
supergravity. The inflationary scale and the reheating temperature must satisfy
certain constraints to avoid too large baryonic isocurvature fluctuations.
|
[
{
"created": "Wed, 28 May 2008 01:42:19 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Kasuya",
"Shinta",
""
],
[
"Kawasaki",
"Masahiro",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] |
We reconsider the Affleck-Dine mechanism for baryogenesis and show that the baryonic isocurvature fluctuations are generated in many inflation models in supergravity. The inflationary scale and the reheating temperature must satisfy certain constraints to avoid too large baryonic isocurvature fluctuations.
|
hep-ph/9503357
|
Mostafa Mostafa
|
M. G.-H. Mostafa, Cheuk-Yin Wong, Lali Chatterjee, and Zhong-Qi Wang
|
Effect of $q\bar q$ Initial-state Interaction on Dilepton Emission Rate
from Quark-Gluon Plasma
|
14 pages(REVTeX),includes 3 uuencoded compressed postscript figures
| null | null |
ORNL-CTP-95-03/ASU-FSHEP-95-01
|
hep-ph
| null |
We calculate the dilepton production rate from a thermalized quark-gluon
plasma in heavy-ion collisions at RHIC energies. Higher-order QCD corrections
are included by using an analytical correction factor $K^{(i)}$, which takes
into account the $q\bar q$ initial-state interactions. We show that the
analytic correction factor gives very good agreement with experimental
Drell-Yan data and leads to large enhancement of the thermal dilepton emission
rates. We compare the thermal dilepton yields with the expected production from
open-charm decays and Drell-Yan background and assess the prospects of
observing thermal dileptons from the quark-gluon-plasma at invariant masses of
a few GeV.
|
[
{
"created": "Thu, 16 Mar 1995 21:59:02 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 1995 16:06:08 GMT",
"version": "v2"
}
] |
2009-09-25
|
[
[
"Mostafa",
"M. G. -H.",
""
],
[
"Wong",
"Cheuk-Yin",
""
],
[
"Chatterjee",
"Lali",
""
],
[
"Wang",
"Zhong-Qi",
""
]
] |
We calculate the dilepton production rate from a thermalized quark-gluon plasma in heavy-ion collisions at RHIC energies. Higher-order QCD corrections are included by using an analytical correction factor $K^{(i)}$, which takes into account the $q\bar q$ initial-state interactions. We show that the analytic correction factor gives very good agreement with experimental Drell-Yan data and leads to large enhancement of the thermal dilepton emission rates. We compare the thermal dilepton yields with the expected production from open-charm decays and Drell-Yan background and assess the prospects of observing thermal dileptons from the quark-gluon-plasma at invariant masses of a few GeV.
|
1211.4648
|
Eric S. Swanson
|
Joseph Meyers and Eric S. Swanson
|
Spin Zero Glueballs in the Bethe-Salpeter Formalism
|
13 pages, 11 pdf figures
| null |
10.1103/PhysRevD.87.036009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Schwinger-Dyson Bethe-Salpeter approach to the bound state problem is
applied to the spin zero glueball spectrum. Although a moderately successful
description of the two point functions and the glueball spectrum can be
obtained, further work is required to reduce sensitivity to model truncations.
|
[
{
"created": "Tue, 20 Nov 2012 01:39:51 GMT",
"version": "v1"
}
] |
2013-03-14
|
[
[
"Meyers",
"Joseph",
""
],
[
"Swanson",
"Eric S.",
""
]
] |
The Schwinger-Dyson Bethe-Salpeter approach to the bound state problem is applied to the spin zero glueball spectrum. Although a moderately successful description of the two point functions and the glueball spectrum can be obtained, further work is required to reduce sensitivity to model truncations.
|
2103.04299
|
Rahul Ramachandran Nair
|
Rahul Ramachandran Nair
|
On the light front surfaces in the phase space of hadrons in heavy-ion
collisions
|
6 pages, 4 figures, 1 table
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Surfaces corresponding to the constant values of the light front variable
forms paraboloids in the phase space of the inclusively produced hadrons in
heavy-ion collisions. In this paper, it is demonstrated with the simulated
Au-Au collisions at $\sqrt{s} = 200$ GeV using the UrQMD event generator that
the paraboloidal surface defined by a certain constant value of the light front
variable divides the particles in the phase space into two groups such that the
distributions of the square of the transverse momentum, the polar angle and the
light front variable of particles belonging to one among them can be described
with the Boltzmann distribution parameterised by the mass-dependent
temperature.
|
[
{
"created": "Sun, 7 Mar 2021 08:31:06 GMT",
"version": "v1"
}
] |
2021-03-09
|
[
[
"Nair",
"Rahul Ramachandran",
""
]
] |
Surfaces corresponding to the constant values of the light front variable forms paraboloids in the phase space of the inclusively produced hadrons in heavy-ion collisions. In this paper, it is demonstrated with the simulated Au-Au collisions at $\sqrt{s} = 200$ GeV using the UrQMD event generator that the paraboloidal surface defined by a certain constant value of the light front variable divides the particles in the phase space into two groups such that the distributions of the square of the transverse momentum, the polar angle and the light front variable of particles belonging to one among them can be described with the Boltzmann distribution parameterised by the mass-dependent temperature.
|
hep-ph/9511452
|
Jan Bolz
|
P. Kroll (University of Wuppertal, Germany)
|
Spin effects in hard exclusive reactions
|
Invited talk presented at the SPIN95 Conference, Protvino (1995); 14
pages Latex (uses 'epsf' and 'psfig'), including 5 PS-figures in uu-encoded
compressed file
| null | null |
WU-B 95-31
|
hep-ph
| null |
The present status of applications of perturbative QCD to large momentum
transfer exclusive reactions is discussed. It is argued that in the region of
momentum transfer accessible to present day experiments soft contributions
dominate the exclusive processes.
|
[
{
"created": "Wed, 29 Nov 1995 13:58:48 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kroll",
"P.",
"",
"University of Wuppertal, Germany"
]
] |
The present status of applications of perturbative QCD to large momentum transfer exclusive reactions is discussed. It is argued that in the region of momentum transfer accessible to present day experiments soft contributions dominate the exclusive processes.
|
0804.0648
|
Ying Li
|
Yu-ming Wang, Ying Li, Cai-Dian Lu
|
Rare Decays of \Lambda_b->\Lambda + \gamma and \Lambda_b ->\Lambda +
l^{+} l^{-} in the Light-cone Sum Rules
|
38 pages, 15 figures, some typos are corrected and more references
are added
|
Eur.Phys.J.C59:861-882,2009
|
10.1140/epjc/s10052-008-0846-5
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Within the Standard Model, we investigate the weak decays of $\Lambda_b \to
\Lambda + \gamma$ and $\Lambda_b \to \Lambda + l^{+} l^{-}$ with the light-cone
sum rules approach. The higher twist distribution amplitudes of $\Lambda$
baryon to the leading conformal spin are included in the sum rules for
transition form factors. Our results indicate that the higher twist
distribution amplitudes almost have no influences on the transition form
factors retaining the heavy quark spin symmetry, while such corrections can
result in significant impacts on the form factors breaking the heavy quark spin
symmetry. Two phenomenological models (COZ and FZOZ) for the wave function of
$\Lambda$ baryon are also employed in the sum rules for a comparison, which can
give rise to the form factors approximately 5 times larger than that in terms
of conformal expansion. Utilizing the form factors calculated in LCSR, we then
perform a careful study on the decay rate, polarization asymmetry and
forward-backward asymmetry, with respect to the decays of $\Lambda_b \to
\Lambda \gamma$, $\Lambda l^{+}l^{-}$.
|
[
{
"created": "Fri, 4 Apr 2008 03:39:31 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Apr 2008 12:11:52 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Apr 2008 14:00:18 GMT",
"version": "v3"
}
] |
2014-11-18
|
[
[
"Wang",
"Yu-ming",
""
],
[
"Li",
"Ying",
""
],
[
"Lu",
"Cai-Dian",
""
]
] |
Within the Standard Model, we investigate the weak decays of $\Lambda_b \to \Lambda + \gamma$ and $\Lambda_b \to \Lambda + l^{+} l^{-}$ with the light-cone sum rules approach. The higher twist distribution amplitudes of $\Lambda$ baryon to the leading conformal spin are included in the sum rules for transition form factors. Our results indicate that the higher twist distribution amplitudes almost have no influences on the transition form factors retaining the heavy quark spin symmetry, while such corrections can result in significant impacts on the form factors breaking the heavy quark spin symmetry. Two phenomenological models (COZ and FZOZ) for the wave function of $\Lambda$ baryon are also employed in the sum rules for a comparison, which can give rise to the form factors approximately 5 times larger than that in terms of conformal expansion. Utilizing the form factors calculated in LCSR, we then perform a careful study on the decay rate, polarization asymmetry and forward-backward asymmetry, with respect to the decays of $\Lambda_b \to \Lambda \gamma$, $\Lambda l^{+}l^{-}$.
|
hep-ph/0106136
|
Erhan Iltan
|
E. O. Iltan (METU,Ankara), G. Turan (METU,Ankara), I. Turan
(METU,Ankara)
|
B --> K^* \tau^+ \tau^- decay in the general two Higgs doublet model
including the neutral Higgs boson effects
|
20 pages, 11 Figures
|
J.Phys.G28:307-320,2002
|
10.1088/0954-3899/28/2/309
| null |
hep-ph
| null |
We study the CP violating asymmetry, the forward-backward asymmetry of the
lepton pair and the CP asymmetry in the forward backward asymmetry for the
exclusive decay $B --> K^* \tau^+ \tau^- in the general two Higgs doublet model
including the neutral Higgs boson effects. We analyse the dependencies of these
quantities on the model III parameters. We found that the physical parameters
studied above are at the order of the magnitude 1% and neutral Higgs boson
effects are detectable for large values of the coupling
\bar{\xi}_{N,\tau\tau}^D.
|
[
{
"created": "Wed, 13 Jun 2001 14:13:11 GMT",
"version": "v1"
}
] |
2010-05-28
|
[
[
"Iltan",
"E. O.",
"",
"METU,Ankara"
],
[
"Turan",
"G.",
"",
"METU,Ankara"
],
[
"Turan",
"I.",
"",
"METU,Ankara"
]
] |
We study the CP violating asymmetry, the forward-backward asymmetry of the lepton pair and the CP asymmetry in the forward backward asymmetry for the exclusive decay $B --> K^* \tau^+ \tau^- in the general two Higgs doublet model including the neutral Higgs boson effects. We analyse the dependencies of these quantities on the model III parameters. We found that the physical parameters studied above are at the order of the magnitude 1% and neutral Higgs boson effects are detectable for large values of the coupling \bar{\xi}_{N,\tau\tau}^D.
|
hep-ph/0109255
|
Jonathan Osborne
|
Jonathan Osborne
|
A Study of Nucleon Spin Struture from Quantum Chromodynamics
|
319 pages, 29 figures
| null | null | null |
hep-ph
| null |
I present an introduction to the field of Quantum Chromodynamics (QCD) with
emphasis on nucleon spin structure and perturbative methods. After a somewhat
comprehensive overview of perturbative QCD, including the systematics of
renormalization, I introduce deeply-inelastic scattering and deeply-virtual
Compton scattering along with the nonperturbative distribution functions
appearing in these processes. I show how these processes can be used to extract
the distribution of longitudinal spin of nucleons, and briefly discuss the
complications associated with transverse spin components.
There are five appendices which accompany this work, discussing topics
ranging from canonical field quantization to dimensional regularization to the
structure of several important Lie groups. These appendices are meant to give
the reader a certain basic understanding of some of the mathematical details
underlying the main text, as well as provide a useful reference.
This work was submitted in a slightly different form to the University of
Maryland at College Park in partial completion of the requirements for a doctor
of philosophy in physics, received August 2000.
|
[
{
"created": "Thu, 27 Sep 2001 00:04:10 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Nov 2001 21:53:51 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Osborne",
"Jonathan",
""
]
] |
I present an introduction to the field of Quantum Chromodynamics (QCD) with emphasis on nucleon spin structure and perturbative methods. After a somewhat comprehensive overview of perturbative QCD, including the systematics of renormalization, I introduce deeply-inelastic scattering and deeply-virtual Compton scattering along with the nonperturbative distribution functions appearing in these processes. I show how these processes can be used to extract the distribution of longitudinal spin of nucleons, and briefly discuss the complications associated with transverse spin components. There are five appendices which accompany this work, discussing topics ranging from canonical field quantization to dimensional regularization to the structure of several important Lie groups. These appendices are meant to give the reader a certain basic understanding of some of the mathematical details underlying the main text, as well as provide a useful reference. This work was submitted in a slightly different form to the University of Maryland at College Park in partial completion of the requirements for a doctor of philosophy in physics, received August 2000.
|
1710.04114
|
Aleksandra Lelek
|
Aleksandra Lelek (DESY)
|
Collinear and Transverse Momentum Dependent parton densities obtained
with a Parton Branching Method
| null | null | null |
DESY 17-134
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a solution of the DGLAP evolution equations, written in terms of
Sudakov form factors to describe the branching and no-branching probabilities,
using a parton branching Monte Carlo method. We demonstrate numerically that
this method reproduces the semi-analytical solutions. We show how this method
can be used to determine Transverse Momentum Dependent (TMD) parton
distribution functions, in addition to the usual integrated parton
distributions functions. We discuss numerical effects of the boundary of soft
gluon resolution scale parameter on the resulting parton distribution
functions. We show that a very good fit of the integrated TMDs to high
precision HERA data can be obtained over a large range in x and Q^2.
|
[
{
"created": "Wed, 11 Oct 2017 15:24:25 GMT",
"version": "v1"
}
] |
2017-10-12
|
[
[
"Lelek",
"Aleksandra",
"",
"DESY"
]
] |
We present a solution of the DGLAP evolution equations, written in terms of Sudakov form factors to describe the branching and no-branching probabilities, using a parton branching Monte Carlo method. We demonstrate numerically that this method reproduces the semi-analytical solutions. We show how this method can be used to determine Transverse Momentum Dependent (TMD) parton distribution functions, in addition to the usual integrated parton distributions functions. We discuss numerical effects of the boundary of soft gluon resolution scale parameter on the resulting parton distribution functions. We show that a very good fit of the integrated TMDs to high precision HERA data can be obtained over a large range in x and Q^2.
|
1204.5986
|
Arcadi Santamaria
|
Francisco del Aguila, Alberto Aparici, Subhaditya Bhattacharya, Arcadi
Santamaria, Jose Wudka
|
Effective Lagrangian approach to neutrinoless double beta decay and
neutrino masses
|
Accepted for publication. Few misprints corrected and new references
added
| null |
10.1007/JHEP06(2012)146
|
CAFPE-166/11,UG-FT-296/11,FTUV-12-0426,IFIC/11-66,UCRHEP-T519
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrinoless double beta ($0\nu\beta\beta$) decay can in general produce
electrons of either chirality, in contrast with the minimal Standard Model (SM)
extension with only the addition of the Weinberg operator, which predicts two
left-handed electrons in the final state. We classify the lepton number
violating (LNV) effective operators with two leptons of either chirality but no
quarks, ordered according to the magnitude of their contribution to \znbb
decay. We point out that, for each of the three chirality assignments, $e_Le_L,
e_Le_R$ and $e_Re_R$, there is only one LNV operator of the corresponding type
to lowest order, and these have dimensions 5, 7 and 9, respectively. Neutrino
masses are always induced by these extra operators but can be delayed to one or
two loops, depending on the number of RH leptons entering in the operator.
Then, the comparison of the $0\nu\beta\beta$ decay rate and neutrino masses
should indicate the effective scenario at work, which confronted with the LHC
searches should also eventually decide on the specific model elected by nature.
We also list the SM additions generating these operators upon integration of
the heavy modes, and discuss simple realistic examples of renormalizable
theories for each case.
|
[
{
"created": "Thu, 26 Apr 2012 17:13:35 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2012 18:38:07 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"del Aguila",
"Francisco",
""
],
[
"Aparici",
"Alberto",
""
],
[
"Bhattacharya",
"Subhaditya",
""
],
[
"Santamaria",
"Arcadi",
""
],
[
"Wudka",
"Jose",
""
]
] |
Neutrinoless double beta ($0\nu\beta\beta$) decay can in general produce electrons of either chirality, in contrast with the minimal Standard Model (SM) extension with only the addition of the Weinberg operator, which predicts two left-handed electrons in the final state. We classify the lepton number violating (LNV) effective operators with two leptons of either chirality but no quarks, ordered according to the magnitude of their contribution to \znbb decay. We point out that, for each of the three chirality assignments, $e_Le_L, e_Le_R$ and $e_Re_R$, there is only one LNV operator of the corresponding type to lowest order, and these have dimensions 5, 7 and 9, respectively. Neutrino masses are always induced by these extra operators but can be delayed to one or two loops, depending on the number of RH leptons entering in the operator. Then, the comparison of the $0\nu\beta\beta$ decay rate and neutrino masses should indicate the effective scenario at work, which confronted with the LHC searches should also eventually decide on the specific model elected by nature. We also list the SM additions generating these operators upon integration of the heavy modes, and discuss simple realistic examples of renormalizable theories for each case.
|
hep-ph/9911533
|
A. A. Arkhipov
|
A.A. Arkhipov
|
On Global Structure of Hadronic Total Cross-Sections
|
RevTex, 13 pages, 6 figures, this version was sent for publication in
the Physical Review D
| null | null |
Preprint IHEP 99-45, Protvino, 1999
|
hep-ph
| null |
Simple theoretical formula describing the global structure of pp and p\bar p
total cross-secrions in the whole range of energies available up today has been
derived. The fit to the experimental data with the formula has been made. It is
shown that there is a very good correspondence of the theoretical formula to
the existing experimental data.
|
[
{
"created": "Tue, 30 Nov 1999 13:07:55 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Dec 2001 15:04:26 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Arkhipov",
"A. A.",
""
]
] |
Simple theoretical formula describing the global structure of pp and p\bar p total cross-secrions in the whole range of energies available up today has been derived. The fit to the experimental data with the formula has been made. It is shown that there is a very good correspondence of the theoretical formula to the existing experimental data.
|
hep-ph/0301126
|
Markus Buescher
|
M.Buescher, F.P.Sassen, N.N.Achasov, L.Kondratyuk
|
Investigation of light scalar resonances at COSY
|
Contribution to the workshop on the future physics program at
COSY-Juelich, CSS2002 (8 pages, no figures)
| null | null | null |
hep-ph nucl-ex nucl-th
| null |
The $a_0$(980) and $f_0$(980) resonances are two well established states in
the excited meson spectrum. We review the most prominent theoretical models
which try to explain the structure of these states. It is discussed whether
data from COSY on $a_0$ and $f_0$ production in $pp$, $pn$, $pd$ and $dd$
collisions allow to distinguish between the different approaches. Very
promising in this respect seems to be the measurement of the reaction $dd \to
(\mathrm{^4He} a_0^0 \to) \mathrm{^4He} \pi^0\eta$ which violates isospin
conservation and can be related to $a_0$-$f_0$ mixing.
|
[
{
"created": "Fri, 17 Jan 2003 08:10:23 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Buescher",
"M.",
""
],
[
"Sassen",
"F. P.",
""
],
[
"Achasov",
"N. N.",
""
],
[
"Kondratyuk",
"L.",
""
]
] |
The $a_0$(980) and $f_0$(980) resonances are two well established states in the excited meson spectrum. We review the most prominent theoretical models which try to explain the structure of these states. It is discussed whether data from COSY on $a_0$ and $f_0$ production in $pp$, $pn$, $pd$ and $dd$ collisions allow to distinguish between the different approaches. Very promising in this respect seems to be the measurement of the reaction $dd \to (\mathrm{^4He} a_0^0 \to) \mathrm{^4He} \pi^0\eta$ which violates isospin conservation and can be related to $a_0$-$f_0$ mixing.
|
hep-ph/0404142
|
Hisakazu Minakata
|
Martin Blom and Hisakazu Minakata
|
Unity of CP and T Violation in Neutrino Oscillations
|
20 references added, version to appear in "Focus Issue on Neutrino
Physics" of New Journal of Physics
|
New J.Phys. 6 (2004) 130
|
10.1088/1367-2630/6/1/130
| null |
hep-ph
| null |
In a previous work a simultaneous P- CP[P] and P- T[P] bi-probability plot
was proposed as a useful tool for unified graphical description of CP and T
violation in neutrino oscillation. The ``baseball diamond'' structure of the
plot is understood as a consequence of the approximate CP-CP and the T-CP
relations obeyed by the oscillation probabilities. In this paper, we make a
step forward toward deeper understanding of the unified graphical
representation by showing that these two relations are identical in its
content, suggesting a truly unifying view of CP and T violation in neutrino
oscillations. We suspect that the unity reflects the underlying CPT theorem. We
also present calculation of corrections to the CP-CP and the T-CP relations to
leading order in Delta m^2_{21} / Delta m^2_{31} and s^2_{13}.
|
[
{
"created": "Fri, 16 Apr 2004 22:52:19 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Aug 2004 17:50:30 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Blom",
"Martin",
""
],
[
"Minakata",
"Hisakazu",
""
]
] |
In a previous work a simultaneous P- CP[P] and P- T[P] bi-probability plot was proposed as a useful tool for unified graphical description of CP and T violation in neutrino oscillation. The ``baseball diamond'' structure of the plot is understood as a consequence of the approximate CP-CP and the T-CP relations obeyed by the oscillation probabilities. In this paper, we make a step forward toward deeper understanding of the unified graphical representation by showing that these two relations are identical in its content, suggesting a truly unifying view of CP and T violation in neutrino oscillations. We suspect that the unity reflects the underlying CPT theorem. We also present calculation of corrections to the CP-CP and the T-CP relations to leading order in Delta m^2_{21} / Delta m^2_{31} and s^2_{13}.
|
1911.12686
|
Igor Strakovsky
|
Igor Strakovsky (GWU), Denis Epifanov (Budker Ins), and Lubomir
Pentchev (JLab)
|
J/$\psi$p Scattering Length from GlueX Threshold Measurements
|
5 pages, 2 figures, v1 had a typo
|
Phys. Rev. C 101, 042201 (2020)
|
10.1103/PhysRevC.101.042201
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The quality of the recent GlueX $J/\psi $ photoproduction data from Hall~D at
Jefferson Laboratory, and the proximity of the data to the energy threshold,
gives access to a variety of interesting physics aspects. As an example, an
estimation of the $J/\psi$-nucleon scattering length $\alpha_{J/\psi p}$ is
provided within the vector meson dominance model. It results in
$|\alpha_{J/\psi p}| = (3.08\pm 0.55 ({\rm stat.}) \pm 0.45 ({\rm
syst.}))$~mfm.
|
[
{
"created": "Thu, 28 Nov 2019 12:55:28 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Dec 2019 22:47:14 GMT",
"version": "v2"
}
] |
2020-04-15
|
[
[
"Strakovsky",
"Igor",
"",
"GWU"
],
[
"Epifanov",
"Denis",
"",
"Budker Ins"
],
[
"Pentchev",
"Lubomir",
"",
"JLab"
]
] |
The quality of the recent GlueX $J/\psi $ photoproduction data from Hall~D at Jefferson Laboratory, and the proximity of the data to the energy threshold, gives access to a variety of interesting physics aspects. As an example, an estimation of the $J/\psi$-nucleon scattering length $\alpha_{J/\psi p}$ is provided within the vector meson dominance model. It results in $|\alpha_{J/\psi p}| = (3.08\pm 0.55 ({\rm stat.}) \pm 0.45 ({\rm syst.}))$~mfm.
|
1604.03255
|
Norihito Toyota
|
Kanji Fujii and Norihito Toyota
|
Remark on Structure of Expectation Values of Flavor-Lepton Numbers with
respect to Neutrino-Source Hadron States: Deviation from Fermi's Golden
Relatio
|
6pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In our preceeding reports, we have pointed out that a unified description of
weak decays accompanying neutrinos and the oscillation process is obtained on
the basis of the expectation values of flavor-neutrino numbers with respect to
the neutrino-source hadron state. In the present report, we investigate the
effect on the expectation values due to the deviation from Fermi's golden
relation, and give concrete features of these deviations in the case of $\pi^+$
and $K^+$-decays under the simple situation with the $3$-momentum $\vec{p_A}=0$
for $A=\pi^+$, $K^+$. %numerical results under simple situations.
|
[
{
"created": "Tue, 12 Apr 2016 06:13:42 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2016 05:32:11 GMT",
"version": "v2"
}
] |
2016-04-20
|
[
[
"Fujii",
"Kanji",
""
],
[
"Toyota",
"Norihito",
""
]
] |
In our preceeding reports, we have pointed out that a unified description of weak decays accompanying neutrinos and the oscillation process is obtained on the basis of the expectation values of flavor-neutrino numbers with respect to the neutrino-source hadron state. In the present report, we investigate the effect on the expectation values due to the deviation from Fermi's golden relation, and give concrete features of these deviations in the case of $\pi^+$ and $K^+$-decays under the simple situation with the $3$-momentum $\vec{p_A}=0$ for $A=\pi^+$, $K^+$. %numerical results under simple situations.
|
1208.4086
|
Martin Block
|
Martin M. Block and Francis Halzen
|
New experimental evidence that the proton develops asymptotically into a
black disk
|
4 pages, 3 figures
| null |
10.1103/PhysRevD.86.051504
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the Auger group has extracted the proton-air cross section from
observations of air showers produced by cosmic ray protons (and nuclei)
interacting in the atmosphere and converted it into measurements of the total
and inelastic $pp$ cross sections $\sigma_{\rm tot}$ and $\sigma_{\rm inel}$ at
the super-LHC energy of 57 TeV. Their results reinforce our earlier conclusions
that the proton becomes a black disk at asymptotic energies, a prediction
reached on the basis of sub-LHC $\pbar p$ and $pp$ measurements of $\sigma_{\rm
tot}$ and $\rho$, the ratio of the real to the imaginary part of the forward
scattering amplitude [M. M. Block and F. Halzen, Phys. Rev. Lett. {\bf 107},
212002 (2011)]. The same black disk description of the proton anticipated the
values of $\sigma_{\rm tot}$ and $\sigma_{\rm inel}$ measured by the TOTEM
experiment at the LHC cms (center of mass) energy of $\sqrt s=7$ TeV, as well
as those of $\sigma_{\rm inel}$ measured by ALICE, ATLAS and CMS, as well as
the ALICE measurement at 2.76 TeV. All data are consistent with a proton that
is asymptotically a black disk of gluons: (i) both $\sigma_{\rm tot}$ and
$\sigma_{\rm inel}$ behave as $\ln^2s$, saturating the Froissart bound, (ii)
the forward scattering amplitude becomes pure imaginary (iii) the ratio
$\sigma_{\rm inel}/\sigma_{\rm tot}=0.509 \pm 0.021$, compatible with the black
disk value of 1/2, and (iv) proton interactions become flavor blind.
|
[
{
"created": "Mon, 20 Aug 2012 19:20:53 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Block",
"Martin M.",
""
],
[
"Halzen",
"Francis",
""
]
] |
Recently, the Auger group has extracted the proton-air cross section from observations of air showers produced by cosmic ray protons (and nuclei) interacting in the atmosphere and converted it into measurements of the total and inelastic $pp$ cross sections $\sigma_{\rm tot}$ and $\sigma_{\rm inel}$ at the super-LHC energy of 57 TeV. Their results reinforce our earlier conclusions that the proton becomes a black disk at asymptotic energies, a prediction reached on the basis of sub-LHC $\pbar p$ and $pp$ measurements of $\sigma_{\rm tot}$ and $\rho$, the ratio of the real to the imaginary part of the forward scattering amplitude [M. M. Block and F. Halzen, Phys. Rev. Lett. {\bf 107}, 212002 (2011)]. The same black disk description of the proton anticipated the values of $\sigma_{\rm tot}$ and $\sigma_{\rm inel}$ measured by the TOTEM experiment at the LHC cms (center of mass) energy of $\sqrt s=7$ TeV, as well as those of $\sigma_{\rm inel}$ measured by ALICE, ATLAS and CMS, as well as the ALICE measurement at 2.76 TeV. All data are consistent with a proton that is asymptotically a black disk of gluons: (i) both $\sigma_{\rm tot}$ and $\sigma_{\rm inel}$ behave as $\ln^2s$, saturating the Froissart bound, (ii) the forward scattering amplitude becomes pure imaginary (iii) the ratio $\sigma_{\rm inel}/\sigma_{\rm tot}=0.509 \pm 0.021$, compatible with the black disk value of 1/2, and (iv) proton interactions become flavor blind.
|
hep-ph/0503136
|
Joao Silva
|
F. J. Botella and J. P. Silva
|
Reparametrization invariance of B decay amplitudes and implications for
new physics searches in B decays
|
16 pages, RevTex
|
Phys.Rev. D71 (2005) 094008
|
10.1103/PhysRevD.71.094008
| null |
hep-ph
| null |
When studying B decays within the Standard Model, it is customary to use the
unitarity of the CKM matrix in order to write the decay amplitudes in terms of
only two of the three weak phases which appear in the various diagrams.
Occasionally, it is mentioned that those two weak phases can be used in order
to describe any decay amplitude, even beyond the Standard Model. Here we point
out that, when describing a generic decay amplitude, the two weak phases can be
chosen completely at will, and we study the behavior of the decay amplitudes
under changes in the two weak phases chosen as a basis. Of course, physical
observables cannot depend on such reparametrizations. This has an impact in
discussions of the SM and in attempts to parametrize new physics effects in the
decay amplitudes. We illustrate these issues by looking at B --> psi K_S and
the isospin analysis in B --> pi pi.
|
[
{
"created": "Mon, 14 Mar 2005 21:07:13 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Botella",
"F. J.",
""
],
[
"Silva",
"J. P.",
""
]
] |
When studying B decays within the Standard Model, it is customary to use the unitarity of the CKM matrix in order to write the decay amplitudes in terms of only two of the three weak phases which appear in the various diagrams. Occasionally, it is mentioned that those two weak phases can be used in order to describe any decay amplitude, even beyond the Standard Model. Here we point out that, when describing a generic decay amplitude, the two weak phases can be chosen completely at will, and we study the behavior of the decay amplitudes under changes in the two weak phases chosen as a basis. Of course, physical observables cannot depend on such reparametrizations. This has an impact in discussions of the SM and in attempts to parametrize new physics effects in the decay amplitudes. We illustrate these issues by looking at B --> psi K_S and the isospin analysis in B --> pi pi.
|
hep-ph/9901436
|
Nobuyuki Sakai
|
Yoonbai Kim, Seung Joo Lee (Sungkyunkwan U.), Kei-ichi Maeda (Waseda
U.), Nobuyuki Sakai (YITP, Kyoto U.)
|
Gauged Monopole-Bubble
|
13 pages, latex, including figures
|
Phys.Lett. B452 (1999) 214-220
|
10.1016/S0370-2693(99)00299-3
|
SNUTP-98-102, WU-AP/73/98, YITP-98-64
|
hep-ph hep-th
| null |
The decay of a metastable false vacuum by bubble nucleation is studied in the
high temperature limit of the gauge theory in which an SO(3) gauge symmetry is
spontaneously broken to an SO(2). The effects of internal symmetry are so
drastic that, in addition to the known Euclidean bounce solution, there exists
a new bubble solution involving a 't Hooft-Polyakov monopole at its center the
moment it is nucleated. The decay rate and evolution are analyzed.
|
[
{
"created": "Thu, 28 Jan 1999 05:54:48 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Kim",
"Yoonbai",
"",
"Sungkyunkwan U."
],
[
"Lee",
"Seung Joo",
"",
"Sungkyunkwan U."
],
[
"Maeda",
"Kei-ichi",
"",
"Waseda\n U."
],
[
"Sakai",
"Nobuyuki",
"",
"YITP, Kyoto U."
]
] |
The decay of a metastable false vacuum by bubble nucleation is studied in the high temperature limit of the gauge theory in which an SO(3) gauge symmetry is spontaneously broken to an SO(2). The effects of internal symmetry are so drastic that, in addition to the known Euclidean bounce solution, there exists a new bubble solution involving a 't Hooft-Polyakov monopole at its center the moment it is nucleated. The decay rate and evolution are analyzed.
|
1112.5958
|
Badri Magradze
|
B.A. Magradze
|
Strong Coupling Constant from $\tau$ Decay within a Dispersive Approach
to Perturbative QCD
|
17 pages,1 postscript fig. 6 Tables, Talk presented at the
international conference "Continuum mechanics and related problems of
Analysis" dedicated to the 120-th birthday of academician N. Muskhelishvili.
Abstract corrected, Introduction corrected, Figure 1 added, in Sect.3 new
material added, Eqs.(40),(41),(42),(43) added. References 17 and 51 added
|
Proceedings of A. Razmadze Mathematical Institute Vol. 160 (2012),
91-111
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new dispersive framework for the extraction of the strong
coupling constant $\alpha_s$ from $\tau$-lepton decays. A new feature of our
procedure is the use of the quark-hadron duality on the limited region $s_{\rm
d}<s<m_{\tau}^{2}$. The duality point $s_{\rm d}$ and the $\bar{\rm MS}$ strong
coupling constant $\alpha_{s}(m_{\tau}^{2})$ are self-consistently extracted
from the $\tau$ data for the non-strange vector spectral function. We use 2005
ALEPH and 1998 OPAL experimental data on the vector spectral function. We
compare the new framework with the contour improved perturbation theory up to
order $\alpha_s^{5}$. The new procedure yields systematically lower values for
$\alpha_s$. From the 2005 ALEPH data, we obtain
$\alpha_{s}(m_{\tau}^{2})=0.308\pm 0.014_{\rm exp}\pm 0.005_{\rm th}$ which
corresponds to $\alpha_{s}(M_{\rm_{z}}^{2})=0.1170\pm 0.0018_{\rm exp}\pm
0.0007_{\rm th}\pm 0.0005_{\rm ev}$. The extracted value for the duality point
$s_{\rm d}$ is found surprisingly stable against perturbation theory
corrections $s_{\rm d}= 1.71\pm 0.05_{\rm exp}\pm 0.00_{\rm th}\,\, {\rm
GeV^{2}}$. From the 1998 OPAL data, we obtain
$\alpha_{s}(m_{\tau}^{2})=0.290\pm 0.023_{\rm exp}$ and $s_{\rm d}=1.68\pm
0.10_{\rm exp}\,\, {\rm GeV^{2}}$.
|
[
{
"created": "Tue, 27 Dec 2011 13:27:20 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Mar 2012 13:59:04 GMT",
"version": "v2"
}
] |
2012-11-26
|
[
[
"Magradze",
"B. A.",
""
]
] |
We present a new dispersive framework for the extraction of the strong coupling constant $\alpha_s$ from $\tau$-lepton decays. A new feature of our procedure is the use of the quark-hadron duality on the limited region $s_{\rm d}<s<m_{\tau}^{2}$. The duality point $s_{\rm d}$ and the $\bar{\rm MS}$ strong coupling constant $\alpha_{s}(m_{\tau}^{2})$ are self-consistently extracted from the $\tau$ data for the non-strange vector spectral function. We use 2005 ALEPH and 1998 OPAL experimental data on the vector spectral function. We compare the new framework with the contour improved perturbation theory up to order $\alpha_s^{5}$. The new procedure yields systematically lower values for $\alpha_s$. From the 2005 ALEPH data, we obtain $\alpha_{s}(m_{\tau}^{2})=0.308\pm 0.014_{\rm exp}\pm 0.005_{\rm th}$ which corresponds to $\alpha_{s}(M_{\rm_{z}}^{2})=0.1170\pm 0.0018_{\rm exp}\pm 0.0007_{\rm th}\pm 0.0005_{\rm ev}$. The extracted value for the duality point $s_{\rm d}$ is found surprisingly stable against perturbation theory corrections $s_{\rm d}= 1.71\pm 0.05_{\rm exp}\pm 0.00_{\rm th}\,\, {\rm GeV^{2}}$. From the 1998 OPAL data, we obtain $\alpha_{s}(m_{\tau}^{2})=0.290\pm 0.023_{\rm exp}$ and $s_{\rm d}=1.68\pm 0.10_{\rm exp}\,\, {\rm GeV^{2}}$.
|
1703.07127
|
Giovanni Salm\`e
|
Giovanni Salme' (INFN-Rome), Wayne de Paula (ITA-S. Jose' dos Campos),
Tobias Frederico (ITA-S. Jose' dos Campos) and Michele Viviani (INFN-Pisa)
|
Two-fermion Bethe-Salpeter Equation in Minkowski Space: the Nakanishi
Way
|
8 pages and 4 figures. Accepted for publication in Light-Cone 2016,
Topical Collection
|
Few-Body Systems (2017)
|
10.1007/s00601-017-1286-2
| null |
hep-ph cond-mat.str-el nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The possibility of solving the Bethe-Salpeter Equation in Minkowski space,
even for fermionic systems, is becoming actual, through the applications of
well-known tools: i) the Nakanishi integral representation of the
Bethe-Salpeter amplitude and ii) the light-front projection onto the
null-plane. The theoretical background and some preliminary calculations are
illustrated, in order to show the potentiality and the wide range of
application of the method.
|
[
{
"created": "Tue, 21 Mar 2017 10:25:19 GMT",
"version": "v1"
}
] |
2017-03-22
|
[
[
"Salme'",
"Giovanni",
"",
"INFN-Rome"
],
[
"de Paula",
"Wayne",
"",
"ITA-S. Jose' dos Campos"
],
[
"Frederico",
"Tobias",
"",
"ITA-S. Jose' dos Campos"
],
[
"Viviani",
"Michele",
"",
"INFN-Pisa"
]
] |
The possibility of solving the Bethe-Salpeter Equation in Minkowski space, even for fermionic systems, is becoming actual, through the applications of well-known tools: i) the Nakanishi integral representation of the Bethe-Salpeter amplitude and ii) the light-front projection onto the null-plane. The theoretical background and some preliminary calculations are illustrated, in order to show the potentiality and the wide range of application of the method.
|
hep-ph/9702411
|
Conrad Burden
|
C. J. Burden (Australian National University)
|
The analytic structure of heavy quark propagators
|
21 pages Latex and 5 postscript figures. The original version of this
paper has been considerably extended to include a formalism dealing with the
renormalised heavy quark Dyson-Schwinger equation and uses a more realistic
Ansatz for the gluon propagator.
|
Phys.Rev. D57 (1998) 276-286
|
10.1103/PhysRevD.57.276
| null |
hep-ph
| null |
The renormalised quark Dyson-Schwinger equation is studied in the limit of
the renormalised current heavy quark mass m_R --> infinity. We are particularly
interested in the analytic pole structure of the heavy quark propagator in the
complex momentum plane. Approximations in which the quark-gluon vertex is
modelled by either the bare vertex or the Ball-Chiu Ansatz, and the Landau
gauge gluon propagator takes either a gaussian form or a gaussian form with an
ultraviolet asymptotic tail are used.
|
[
{
"created": "Tue, 25 Feb 1997 03:17:04 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 1997 01:00:24 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Burden",
"C. J.",
"",
"Australian National University"
]
] |
The renormalised quark Dyson-Schwinger equation is studied in the limit of the renormalised current heavy quark mass m_R --> infinity. We are particularly interested in the analytic pole structure of the heavy quark propagator in the complex momentum plane. Approximations in which the quark-gluon vertex is modelled by either the bare vertex or the Ball-Chiu Ansatz, and the Landau gauge gluon propagator takes either a gaussian form or a gaussian form with an ultraviolet asymptotic tail are used.
|
1412.4357
|
Redamy P\'erez-Ramos
|
Redamy P\'erez-Ramos
|
Inclusive transverse momentum distribution of hadrons in jets produced
in PbPb and pp collisions at the LHC: Data versus jet-quenching Monte Carlos
|
6 pages and 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The inclusive transverse momentum (pt) distribution of hadrons inside jets
produced in PbPb and pp collisions are simulated with the YaJEM and Pythia 6
Monte Carlo (MC) event generators. The effects of jet quenching are studied via
the ratios of PbPb over pp hadron pt spectra, either by accounting for the
induced virtuality Delta Q^2 transferred from the strongly-interacting medium
to the parton shower or by modifying the soft sector of the parton-to-hadron
fragmentation functions. The MC results are compared to experimental jet data
measured by the CMS experiment at a center-of-mass energy of 2.76 TeV in four
jet p_T^{jet} ranges above 100 GeV, accounting or not for the experimental jet
reconstruction biases. The level of data-MC (dis)agreement provides valuable
information on the mechanism of parton energy loss.
|
[
{
"created": "Sun, 14 Dec 2014 13:40:45 GMT",
"version": "v1"
}
] |
2014-12-16
|
[
[
"Pérez-Ramos",
"Redamy",
""
]
] |
The inclusive transverse momentum (pt) distribution of hadrons inside jets produced in PbPb and pp collisions are simulated with the YaJEM and Pythia 6 Monte Carlo (MC) event generators. The effects of jet quenching are studied via the ratios of PbPb over pp hadron pt spectra, either by accounting for the induced virtuality Delta Q^2 transferred from the strongly-interacting medium to the parton shower or by modifying the soft sector of the parton-to-hadron fragmentation functions. The MC results are compared to experimental jet data measured by the CMS experiment at a center-of-mass energy of 2.76 TeV in four jet p_T^{jet} ranges above 100 GeV, accounting or not for the experimental jet reconstruction biases. The level of data-MC (dis)agreement provides valuable information on the mechanism of parton energy loss.
|
1709.08543
|
Mari\'an Koles\'ar
|
Marian Kolesar, Jiri Novotny
|
Constraints on low energy QCD parameters from $\eta \to 3\pi$ and
$\pi\pi$ scattering
|
23 pages, 8 figures
| null |
10.1140/epjc/s10052-018-5668-5
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $\eta \to 3\pi$ decays are a valuable source of information on low energy
QCD. Yet they were not used for an extraction of the three flavor chiral
symmetry breaking order parameters until now. We use a Bayesian approach in the
framework of resummed chiral perturbation theory to obtain constraints on the
quark condensate and pseudoscalar decay constant in the chiral limit. We
compare our results with recent CHPT and lattice QCD fits and find some
tension, as the $\eta \to 3\pi$ data seem to prefer a larger ratio of the
chiral order parameters. The results also disfavor a very large value of the
pseudoscalar decay constant in the chiral limit, which was found by some recent
works. In addition, we present results of a combined analysis including $\eta
\to 3\pi$ decays and $\pi\pi$ scattering and though the picture does not
changed appreciably, we find some tension between the data we use. We also try
to extract information on the mass difference of the light quarks, but the
uncertainties prove to be large.
|
[
{
"created": "Mon, 25 Sep 2017 15:15:55 GMT",
"version": "v1"
}
] |
2018-04-18
|
[
[
"Kolesar",
"Marian",
""
],
[
"Novotny",
"Jiri",
""
]
] |
The $\eta \to 3\pi$ decays are a valuable source of information on low energy QCD. Yet they were not used for an extraction of the three flavor chiral symmetry breaking order parameters until now. We use a Bayesian approach in the framework of resummed chiral perturbation theory to obtain constraints on the quark condensate and pseudoscalar decay constant in the chiral limit. We compare our results with recent CHPT and lattice QCD fits and find some tension, as the $\eta \to 3\pi$ data seem to prefer a larger ratio of the chiral order parameters. The results also disfavor a very large value of the pseudoscalar decay constant in the chiral limit, which was found by some recent works. In addition, we present results of a combined analysis including $\eta \to 3\pi$ decays and $\pi\pi$ scattering and though the picture does not changed appreciably, we find some tension between the data we use. We also try to extract information on the mass difference of the light quarks, but the uncertainties prove to be large.
|
2304.10299
|
Paul D. Grannis
|
J.A. Bagger, S. Belomestnykh, P.C. Bhat, J.E. Brau, M. Demarteau, D.
Denisov, S. Gori, P.D. Grannis, T. Junginger, A.J. Lankford, M. Liepe, T.W.
Markiewicz, H.E. Montgomery, M. Perelstein, M.E. Peskin, J. Strube, A.P.
White, G.W. Wilson
|
Statement from the American Linear Collider Committee to the P5 subpanel
|
6 pages
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This statement from the American Linear Collider Committee to the P5 subpanel
has three purposes. It presents a brief summary of the case for an $e^+e^-$
Higgs factory that has emerged from Snowmass 2021. It highlights the special
virtues of the ILC that are shared with other linear colliders but not with
circular colliders. Finally, it calls attention to the resources available in
the ILC White Paper for Snowmass (arXiv:2203.07622). The ALCC urges P5 to move
the Higgs factory forward as a global project by assigning the idea of an
$e^+e^-$ Higgs factory high priority, initiating a global discussion of the
technology choice and cost sharing, and offering the option of siting the Higgs
factory in the U.S.
|
[
{
"created": "Thu, 20 Apr 2023 13:28:20 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Apr 2023 14:07:45 GMT",
"version": "v2"
},
{
"created": "Wed, 17 May 2023 15:03:21 GMT",
"version": "v3"
}
] |
2023-05-18
|
[
[
"Bagger",
"J. A.",
""
],
[
"Belomestnykh",
"S.",
""
],
[
"Bhat",
"P. C.",
""
],
[
"Brau",
"J. E.",
""
],
[
"Demarteau",
"M.",
""
],
[
"Denisov",
"D.",
""
],
[
"Gori",
"S.",
""
],
[
"Grannis",
"P. D.",
""
],
[
"Junginger",
"T.",
""
],
[
"Lankford",
"A. J.",
""
],
[
"Liepe",
"M.",
""
],
[
"Markiewicz",
"T. W.",
""
],
[
"Montgomery",
"H. E.",
""
],
[
"Perelstein",
"M.",
""
],
[
"Peskin",
"M. E.",
""
],
[
"Strube",
"J.",
""
],
[
"White",
"A. P.",
""
],
[
"Wilson",
"G. W.",
""
]
] |
This statement from the American Linear Collider Committee to the P5 subpanel has three purposes. It presents a brief summary of the case for an $e^+e^-$ Higgs factory that has emerged from Snowmass 2021. It highlights the special virtues of the ILC that are shared with other linear colliders but not with circular colliders. Finally, it calls attention to the resources available in the ILC White Paper for Snowmass (arXiv:2203.07622). The ALCC urges P5 to move the Higgs factory forward as a global project by assigning the idea of an $e^+e^-$ Higgs factory high priority, initiating a global discussion of the technology choice and cost sharing, and offering the option of siting the Higgs factory in the U.S.
|
hep-ph/9501238
|
Schlei Bernd
|
R.M. Weiner
|
Correlations and strong interactions
|
13 pages
| null | null | null |
hep-ph
| null |
It is argued that correlations and multiplicity distributions constitute one
of the most characteristic properties of strong interactions. The progress made
in the last years in our understanding of correlations is reviewed.
|
[
{
"created": "Mon, 9 Jan 1995 09:34:32 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Weiner",
"R. M.",
""
]
] |
It is argued that correlations and multiplicity distributions constitute one of the most characteristic properties of strong interactions. The progress made in the last years in our understanding of correlations is reviewed.
|
0909.2238
|
Jian Zhou Mr.
|
Jian Zhou, Feng Yuan, Zuo-Tang Liang
|
Transverse momentum dependent quark distributions and polarized
Drell-Yan processes
|
25 pages, 2 figures
| null |
10.1103/PhysRevD.81.054008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the spin-dependent quark distributions at large transverse momentum.
We derive their transverse momentum behaviors in the collinear factorization
approach in this region. We further calculate the angular distribution of the
Drell-Yan lepton pair production with polarized beams and present the results
in terms of the collinear twist-three quark-gluon correlation functions. In the
intermediate transverse momentum region, we find that the two pproaches: the
collinear factorization and the transverse momentum dependent factorization
approaches are consistent in the description of the lepton pair angular
distributions.
|
[
{
"created": "Fri, 11 Sep 2009 19:53:25 GMT",
"version": "v1"
}
] |
2013-05-29
|
[
[
"Zhou",
"Jian",
""
],
[
"Yuan",
"Feng",
""
],
[
"Liang",
"Zuo-Tang",
""
]
] |
We study the spin-dependent quark distributions at large transverse momentum. We derive their transverse momentum behaviors in the collinear factorization approach in this region. We further calculate the angular distribution of the Drell-Yan lepton pair production with polarized beams and present the results in terms of the collinear twist-three quark-gluon correlation functions. In the intermediate transverse momentum region, we find that the two pproaches: the collinear factorization and the transverse momentum dependent factorization approaches are consistent in the description of the lepton pair angular distributions.
|
1112.3633
|
Omar Gustavo Miranda
|
E. A. Garces, O. G. Miranda, M. A. Tortola and J. W. F. Valle
|
Low-energy neutrino-electron scattering as a Standard Model probe: the
potential of LENA as case study
|
8 pages, 4 figures, fig 4 changed, final version to be published in
Phys. Rev. D
| null |
10.1103/PhysRevD.85.073006
|
IFIC/11-68
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several proposals for studying neutrinos with large detectors are currently
under discussion. We suggest that they could provide a precise measurement of
the electroweak mixing angle as well as a probe for new physics, such as
non-standard neutrino interactions (NSI), and the electroweak gauge structure.
We illustrate this explicitly for the case of the LENA proposal, either with an
artificial radioactive source or by using the solar neutrino flux.
|
[
{
"created": "Thu, 15 Dec 2011 20:15:10 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Mar 2012 23:28:13 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Garces",
"E. A.",
""
],
[
"Miranda",
"O. G.",
""
],
[
"Tortola",
"M. A.",
""
],
[
"Valle",
"J. W. F.",
""
]
] |
Several proposals for studying neutrinos with large detectors are currently under discussion. We suggest that they could provide a precise measurement of the electroweak mixing angle as well as a probe for new physics, such as non-standard neutrino interactions (NSI), and the electroweak gauge structure. We illustrate this explicitly for the case of the LENA proposal, either with an artificial radioactive source or by using the solar neutrino flux.
|
1904.03119
|
Vadim Bednyakov Dr.
|
Vadim A. Bednyakov and Dmitry V. Naumov
|
On coherent neutrino and antineutrino scattering off nuclei
|
9 pages, 4 figures, 83 references. arXiv admin note: substantial text
overlap with arXiv:1806.08768
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrino-nucleus $\nu A\to \nu A$ and antineutrino-nucleus $\bar\nu A\to
\bar\nu A$ interactions, when the nucleus conserves its integrity, are
discussed with coherent (elastic) and incoherent (inelastic) scattering regimes
taken into account. In the first regime the nucleus remains in the same quantum
state after the scattering and the cross-section depends on the quadratic
number of nucleons. In the second regime the nucleus changes its quantum state
and the cross-section has an essentially linear dependence on the number of
nucleons. The coherent and incoherent cross-sections are driven by a nuclear
nucleon form-factor squared $|F|^2$ term and a $(1-|F|^2)$ term, respectively.
One has a smooth transition between the regimes of coherent and incoherent
(anti)neutrino-nucleus scattering. Due to the neutral current nature these
elastic and inelastic processes are indistinguishable if the nucleus recoil
energy is only observed. One way to separate the coherent signal from the
incoherent one is to register $\gamma$ quanta from deexcitation of the nucleus
excited during the incoherent scattering. Another way is to use a very
low-energy threshold detector and collect data at very low recoil energies,
where the incoherent scattering is vanishingly small. In particular, for
${}^{133}\text{Cs}$ and neutrino energies of 30--50 MeV the incoherent
cross-section is about 15-20\% of the coherent one. Therefore, the COHERENT
experiment (with ${}^{133}\text{Cs}$) has measured the coherent elastic
neutrino nucleus scattering (CE$\nu$NS) with the inelastic admixture at a level
of 15-20\%, if the excitation $\gamma$ quantum escapes its detection.
|
[
{
"created": "Fri, 5 Apr 2019 15:26:57 GMT",
"version": "v1"
}
] |
2019-04-08
|
[
[
"Bednyakov",
"Vadim A.",
""
],
[
"Naumov",
"Dmitry V.",
""
]
] |
Neutrino-nucleus $\nu A\to \nu A$ and antineutrino-nucleus $\bar\nu A\to \bar\nu A$ interactions, when the nucleus conserves its integrity, are discussed with coherent (elastic) and incoherent (inelastic) scattering regimes taken into account. In the first regime the nucleus remains in the same quantum state after the scattering and the cross-section depends on the quadratic number of nucleons. In the second regime the nucleus changes its quantum state and the cross-section has an essentially linear dependence on the number of nucleons. The coherent and incoherent cross-sections are driven by a nuclear nucleon form-factor squared $|F|^2$ term and a $(1-|F|^2)$ term, respectively. One has a smooth transition between the regimes of coherent and incoherent (anti)neutrino-nucleus scattering. Due to the neutral current nature these elastic and inelastic processes are indistinguishable if the nucleus recoil energy is only observed. One way to separate the coherent signal from the incoherent one is to register $\gamma$ quanta from deexcitation of the nucleus excited during the incoherent scattering. Another way is to use a very low-energy threshold detector and collect data at very low recoil energies, where the incoherent scattering is vanishingly small. In particular, for ${}^{133}\text{Cs}$ and neutrino energies of 30--50 MeV the incoherent cross-section is about 15-20\% of the coherent one. Therefore, the COHERENT experiment (with ${}^{133}\text{Cs}$) has measured the coherent elastic neutrino nucleus scattering (CE$\nu$NS) with the inelastic admixture at a level of 15-20\%, if the excitation $\gamma$ quantum escapes its detection.
|
1101.0419
|
Romuald A. Janik
|
Romuald A. Janik
|
AdS/CFT and the dynamics of quark-gluon plasma
|
7 pages, talk presented at the New Frontiers in QCD 2010 program at
YITP Kyoto
| null |
10.1143/PTPS.186.534
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk we first discuss the motivation for using the AdS/CFT
correspondence as a tool for the understanding of real-time dynamics of
quark-gluon plasma. After describing the effective dual degrees of freedom for
a strongly coupled gauge theory system, we review the subsequent theoretical
`layers' in the physics of quark-gluon plasma: a uniform plasma at fixed
temperature, linearized fluctuations, nonlinear hydrodynamic behaviour and
finally some aspects of addressing non-equilibrium physics. The discussion is
brief and aimed at nonspecialists.
|
[
{
"created": "Sun, 2 Jan 2011 17:37:47 GMT",
"version": "v1"
}
] |
2015-05-20
|
[
[
"Janik",
"Romuald A.",
""
]
] |
In this talk we first discuss the motivation for using the AdS/CFT correspondence as a tool for the understanding of real-time dynamics of quark-gluon plasma. After describing the effective dual degrees of freedom for a strongly coupled gauge theory system, we review the subsequent theoretical `layers' in the physics of quark-gluon plasma: a uniform plasma at fixed temperature, linearized fluctuations, nonlinear hydrodynamic behaviour and finally some aspects of addressing non-equilibrium physics. The discussion is brief and aimed at nonspecialists.
|
1010.5640
|
Monika Randhawa
|
Neelu Mahajan, Monika Randhawa, Manmohan Gupta, P.S. Gill
|
Investigating texture six zero lepton mass matrices
|
14 pages, 2 figures
|
Prog. Theor. Exp. Phys. 2013, 083B02 (2013)
|
10.1093/ptep/ptt060
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Texture six zero Fritzsch like as well as non Fritzsch like hermitian lepton
mass matrices (144 combinations in all) have been investigated for both
Majorana and Dirac neutrinos for their compatibility with the current neutrino
oscillation data, keeping in mind the hierarchy of neutrino masses. All the
combinations considered here for Majorana neutrino masses are ruled out by the
existing data in the case of inverted hierarchy and degenerate scenario. For
Majorana neutrinos with normal hierarchy, only 16 combinations can accommodate
the experimental data. Assuming neutrinos to be Dirac particles, normal
hierarchy, inverted hierarchy as well as degenerate neutrinos are ruled out for
all combinations of texture 6 zero hermitian mass matrices.
|
[
{
"created": "Wed, 27 Oct 2010 10:35:15 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2013 10:06:38 GMT",
"version": "v2"
}
] |
2013-08-19
|
[
[
"Mahajan",
"Neelu",
""
],
[
"Randhawa",
"Monika",
""
],
[
"Gupta",
"Manmohan",
""
],
[
"Gill",
"P. S.",
""
]
] |
Texture six zero Fritzsch like as well as non Fritzsch like hermitian lepton mass matrices (144 combinations in all) have been investigated for both Majorana and Dirac neutrinos for their compatibility with the current neutrino oscillation data, keeping in mind the hierarchy of neutrino masses. All the combinations considered here for Majorana neutrino masses are ruled out by the existing data in the case of inverted hierarchy and degenerate scenario. For Majorana neutrinos with normal hierarchy, only 16 combinations can accommodate the experimental data. Assuming neutrinos to be Dirac particles, normal hierarchy, inverted hierarchy as well as degenerate neutrinos are ruled out for all combinations of texture 6 zero hermitian mass matrices.
|
hep-ph/0312368
|
Abdel-Nasser Tawfik
|
David E. Miller and Abdel-Nasser M. Tawfik
|
Entanglement in condensates involving strong interactions
|
17 pages, 2 eps figures
|
Appl. Math. Inf. Sci. 5:239-252,2011
| null |
BI-TP 2003/29
|
hep-ph nucl-th quant-ph
| null |
We look at two well known examples of interacting systems relating to
condensed matter in which we put the strong interacting parameters. At high
quark chemical potentials and low temperatures we study the entropy arising
from the excitation in the BCS model of superconductivity and the Bose-Einstein
condensation (BEC) of colored quark pairs. We compare it with the ground state
entropy for a system consisting of two colored quarks. In the BCS model we
found that the entropy strongly depends on the energy gap. Both for the very
small values of the momenta as well as those much greater than the
characterizing Fermi momentum $p_f$, the ground state entropy is dominant. For
the BEC case we suggest a phenomenological model to build up colored bosonic
quark pairs. Here the entropy entirely depends upon the short ranged repulsive
interactions between the quark pairs and vanishes for large momenta.
|
[
{
"created": "Mon, 29 Dec 2003 18:28:13 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Dec 2003 12:24:35 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Jan 2004 10:06:26 GMT",
"version": "v3"
}
] |
2011-06-09
|
[
[
"Miller",
"David E.",
""
],
[
"Tawfik",
"Abdel-Nasser M.",
""
]
] |
We look at two well known examples of interacting systems relating to condensed matter in which we put the strong interacting parameters. At high quark chemical potentials and low temperatures we study the entropy arising from the excitation in the BCS model of superconductivity and the Bose-Einstein condensation (BEC) of colored quark pairs. We compare it with the ground state entropy for a system consisting of two colored quarks. In the BCS model we found that the entropy strongly depends on the energy gap. Both for the very small values of the momenta as well as those much greater than the characterizing Fermi momentum $p_f$, the ground state entropy is dominant. For the BEC case we suggest a phenomenological model to build up colored bosonic quark pairs. Here the entropy entirely depends upon the short ranged repulsive interactions between the quark pairs and vanishes for large momenta.
|
2212.11953
|
Benedict von Harling
|
Sebastian Bruggisser, Benedict von Harling, Oleksii Matsedonskyi,
Geraldine Servant
|
Status of Electroweak Baryogenesis in Minimal Composite Higgs
|
43 pages, 10 figures; v2: one plot, comments and references added,
JHEP version
| null | null |
DESY-22-209
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an update on the status of electroweak baryogenesis in minimal
composite Higgs models. The particularity of this framework is that the
electroweak phase transition can proceed simultaneously with the confinement
phase transition of the new strong dynamics that produces the composite Higgs.
The latter transition is controlled by the dilaton - the pseudo-Goldstone boson
of an approximate scale invariance of the composite sector. Since it naturally
is first-order, the electroweak phase transition becomes first-order too.
Another appealing aspect is that the necessary additional source of CP
violation can arise from the variation of the quark Yukawa couplings during the
phase transition, which is built-in naturally in this scenario. These two
features address the shortcomings of electroweak baryogenesis in the Standard
Model. We confront this scenario with the latest experimental bounds derived
from collider searches for new resonances and measurements of the Higgs
couplings and electric dipole moments. All these constraints provide (or will
be able to provide in the near future) important bounds on the considered
scenario, with the most stringent ones coming from LHC searches for new
resonances which constrain the dilaton mass and couplings. We identify the
viable region of parameter space which satisfies all the constraints, and is
characterized by a dilaton mass in the $300-500$ GeV range and a Higgs decay
constant $f \lesssim 1.1$ TeV. We discuss its future tests.
|
[
{
"created": "Thu, 22 Dec 2022 18:40:25 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Dec 2023 18:11:38 GMT",
"version": "v2"
}
] |
2023-12-12
|
[
[
"Bruggisser",
"Sebastian",
""
],
[
"von Harling",
"Benedict",
""
],
[
"Matsedonskyi",
"Oleksii",
""
],
[
"Servant",
"Geraldine",
""
]
] |
We present an update on the status of electroweak baryogenesis in minimal composite Higgs models. The particularity of this framework is that the electroweak phase transition can proceed simultaneously with the confinement phase transition of the new strong dynamics that produces the composite Higgs. The latter transition is controlled by the dilaton - the pseudo-Goldstone boson of an approximate scale invariance of the composite sector. Since it naturally is first-order, the electroweak phase transition becomes first-order too. Another appealing aspect is that the necessary additional source of CP violation can arise from the variation of the quark Yukawa couplings during the phase transition, which is built-in naturally in this scenario. These two features address the shortcomings of electroweak baryogenesis in the Standard Model. We confront this scenario with the latest experimental bounds derived from collider searches for new resonances and measurements of the Higgs couplings and electric dipole moments. All these constraints provide (or will be able to provide in the near future) important bounds on the considered scenario, with the most stringent ones coming from LHC searches for new resonances which constrain the dilaton mass and couplings. We identify the viable region of parameter space which satisfies all the constraints, and is characterized by a dilaton mass in the $300-500$ GeV range and a Higgs decay constant $f \lesssim 1.1$ TeV. We discuss its future tests.
|
2203.12153
|
Zhilei Ma
|
Zhi-Lei Ma, Zhun Lu, and Li Zhang
|
Inelastic heavy quarkonium photoproduction in ultrarelativistic
heavy-ion collisions
|
19 pages, 10 figures. arXiv admin note: text overlap with
arXiv:2104.14120
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The inelastic charmonium ($J/\psi$, $\psi(2S)$, $\eta_{c}$, $h_{c}$ and
$\chi_{cJ}$) and bottomonium ($\Upsilon(nS)$, $\eta_{b}$, $h_{b}$, and
$\chi_{bJ}$) photoproductions in ultrarelativistic heavy-ion collisions at LHC
energies are studied, where the fragmentation processes are included. Based on
the factorization formalism of non-relativistic QCD, an exact treatment is
developed, which can weight the contribution from different channels and
recovers the Weizs\"{a}cker-Williams approximation (WWA) near the region
$Q^{2}\sim0$. The relevant kinematical relations are also achieved. We present
a comprehensive analysis for the properties of WWA in heavy-ion collisions, and
discuss the contribution of inelastic photoproduction processes to the heavy
quarkonium production. The $Q^{2}$-, $y$-, $\sqrt{s}$-, and $p_{T}$-dependent
cross sections, and the total cross sections are estimated. It is shown that
the inelastic photoproduction and fragmentation processes can provide the
evident modification to the heavy quarkonium production in $p$-$p$ and
$Pb$-$Pb$ collisions at LHC energies, where the ultra-incoherent photon
emission plays a very important role. Moreover, the WWA is only effective in
very restricted domains, and the exact treatment can naturally avoid double
counting and WWA errors.
|
[
{
"created": "Wed, 23 Mar 2022 02:59:23 GMT",
"version": "v1"
}
] |
2022-03-24
|
[
[
"Ma",
"Zhi-Lei",
""
],
[
"Lu",
"Zhun",
""
],
[
"Zhang",
"Li",
""
]
] |
The inelastic charmonium ($J/\psi$, $\psi(2S)$, $\eta_{c}$, $h_{c}$ and $\chi_{cJ}$) and bottomonium ($\Upsilon(nS)$, $\eta_{b}$, $h_{b}$, and $\chi_{bJ}$) photoproductions in ultrarelativistic heavy-ion collisions at LHC energies are studied, where the fragmentation processes are included. Based on the factorization formalism of non-relativistic QCD, an exact treatment is developed, which can weight the contribution from different channels and recovers the Weizs\"{a}cker-Williams approximation (WWA) near the region $Q^{2}\sim0$. The relevant kinematical relations are also achieved. We present a comprehensive analysis for the properties of WWA in heavy-ion collisions, and discuss the contribution of inelastic photoproduction processes to the heavy quarkonium production. The $Q^{2}$-, $y$-, $\sqrt{s}$-, and $p_{T}$-dependent cross sections, and the total cross sections are estimated. It is shown that the inelastic photoproduction and fragmentation processes can provide the evident modification to the heavy quarkonium production in $p$-$p$ and $Pb$-$Pb$ collisions at LHC energies, where the ultra-incoherent photon emission plays a very important role. Moreover, the WWA is only effective in very restricted domains, and the exact treatment can naturally avoid double counting and WWA errors.
|
2008.06169
|
Ismail Zahed
|
Edward Shuryak and Ismail Zahed
|
Nonperturbative quark-antiquark interactions in mesonic form factors
|
82 pages, 17 figures
|
Phys. Rev. D 103, 054028 (2021)
|
10.1103/PhysRevD.103.054028
| null |
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The existing theory of hard exclusive QCD processes is based on two
assumptions: (i) $factorization$ into a $hard\,block$ times light front
distribution amplitudes (DA's); (ii) use of perturbative gluon exchanges within
the hard block. However, unlike DIS and jet physics, the characteristic
momentum transfer $Q$ involved in the factorized block is not large enough for
this theory to be phenomenologically successful. In this work, we revisit the
latter assumption (ii), by explicitly calculating the $instanton-induced$
contributions to the hard block, and show that they contribute substantially to
the vector, scalar and gravitational form factors of the pseudoscalar, scalar
and vector mesons, over a wide range of momentum transfer.
|
[
{
"created": "Fri, 14 Aug 2020 02:31:21 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2020 03:39:55 GMT",
"version": "v2"
}
] |
2021-03-31
|
[
[
"Shuryak",
"Edward",
""
],
[
"Zahed",
"Ismail",
""
]
] |
The existing theory of hard exclusive QCD processes is based on two assumptions: (i) $factorization$ into a $hard\,block$ times light front distribution amplitudes (DA's); (ii) use of perturbative gluon exchanges within the hard block. However, unlike DIS and jet physics, the characteristic momentum transfer $Q$ involved in the factorized block is not large enough for this theory to be phenomenologically successful. In this work, we revisit the latter assumption (ii), by explicitly calculating the $instanton-induced$ contributions to the hard block, and show that they contribute substantially to the vector, scalar and gravitational form factors of the pseudoscalar, scalar and vector mesons, over a wide range of momentum transfer.
|
2005.10689
|
G\"oran F\"aldt
|
G\"oran F\"aldt
|
Remarks on the analysis of the reaction
$e^+e^-\rightarrow\Sigma^0\bar{\Sigma}^0$
|
arXiv admin note: text overlap with arXiv:1908.04157
|
Phys. Rev. D 103, 033001 (2021)
|
10.1103/PhysRevD.103.033001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate roads for evaluating model-independent cross-section
distributions for the sequential hyperon decay $\Sigma^0\rightarrow\Lambda
\gamma;\Lambda\rightarrow p\pi^- $ and its corresponding antihyperon decay. The
hyperons are produced in the reaction $e^+e^-\rightarrow J/{\psi}\rightarrow
\Sigma^0\bar{\Sigma}^0$. Cross-section distributions are calculated using the
folding technique.
|
[
{
"created": "Tue, 19 May 2020 19:08:38 GMT",
"version": "v1"
}
] |
2021-02-10
|
[
[
"Fäldt",
"Göran",
""
]
] |
We investigate roads for evaluating model-independent cross-section distributions for the sequential hyperon decay $\Sigma^0\rightarrow\Lambda \gamma;\Lambda\rightarrow p\pi^- $ and its corresponding antihyperon decay. The hyperons are produced in the reaction $e^+e^-\rightarrow J/{\psi}\rightarrow \Sigma^0\bar{\Sigma}^0$. Cross-section distributions are calculated using the folding technique.
|
1609.02572
|
Keh-Fei Liu
|
Keh-Fei Liu
|
Baryons and Chiral Symmetry
|
To appear in G.E. Brown Memorial Volume
| null |
10.1142/S021830131740016X
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The relevance of chiral symmetry in baryons is highlighted in three examples
in the nucleon spectroscopy and structure. The first one is the importance of
chiral dynamics in understanding the Roper resonance. The second one is the
role of chiral symmetry in the lattice calculation of $\pi N \sigma$ term and
strangeness. The third one is the role of chiral $U(1)$ anomaly in the
anomalous Ward identity in evaluating the quark spin and the quark orbital
angular momentum. Finally, the chiral effective theory for baryons is
discussed.
|
[
{
"created": "Thu, 8 Sep 2016 20:02:00 GMT",
"version": "v1"
}
] |
2017-03-08
|
[
[
"Liu",
"Keh-Fei",
""
]
] |
The relevance of chiral symmetry in baryons is highlighted in three examples in the nucleon spectroscopy and structure. The first one is the importance of chiral dynamics in understanding the Roper resonance. The second one is the role of chiral symmetry in the lattice calculation of $\pi N \sigma$ term and strangeness. The third one is the role of chiral $U(1)$ anomaly in the anomalous Ward identity in evaluating the quark spin and the quark orbital angular momentum. Finally, the chiral effective theory for baryons is discussed.
|
1411.6417
|
Artem Lipatov
|
S.P. Baranov, A.V. Lipatov, N.P. Zotov
|
TMD PDFs in Drell-Yan lepton pair production at LHC
|
Talk presented at International Workshop on Diffraction in
High-Energy Physics, Diffraction-2014
| null |
10.1063/1.4916001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the transverse momentum dependent (TMD) quark densities of the
proton which are very important ingredients for unpolarized Drell-Yan (DY)
lepton pair production. We calculate the TMD sea quark density as a convolution
of the Catani-Ciafaloni-Fiorani-Marchesini (CCFM)-evolved gluon distribution
and the TMD gluon-to-quark splitting function. Based on the ${\cal
O}(\alpha^2)$ production amplitude $q^* + \bar q^* \to Z/\gamma^* \to l^+ +
l^-$, calculated by taking into account the effective $q^*\bar q^* Z/\gamma^*$
- vertex, we analyze the distributions on the dilepton invariant mass,
transverse momentum and rapidity and specific angular correlations between the
produced leptons as measured by the CMS, ATLAS and LHCb collaborations. We
briefly duscuss also the process of assiciated lepton pair and jet production
in $pp$ collisions at the LHC.
|
[
{
"created": "Mon, 24 Nov 2014 11:44:07 GMT",
"version": "v1"
}
] |
2015-06-23
|
[
[
"Baranov",
"S. P.",
""
],
[
"Lipatov",
"A. V.",
""
],
[
"Zotov",
"N. P.",
""
]
] |
We consider the transverse momentum dependent (TMD) quark densities of the proton which are very important ingredients for unpolarized Drell-Yan (DY) lepton pair production. We calculate the TMD sea quark density as a convolution of the Catani-Ciafaloni-Fiorani-Marchesini (CCFM)-evolved gluon distribution and the TMD gluon-to-quark splitting function. Based on the ${\cal O}(\alpha^2)$ production amplitude $q^* + \bar q^* \to Z/\gamma^* \to l^+ + l^-$, calculated by taking into account the effective $q^*\bar q^* Z/\gamma^*$ - vertex, we analyze the distributions on the dilepton invariant mass, transverse momentum and rapidity and specific angular correlations between the produced leptons as measured by the CMS, ATLAS and LHCb collaborations. We briefly duscuss also the process of assiciated lepton pair and jet production in $pp$ collisions at the LHC.
|
hep-ph/0501282
|
Drago Alessandro
|
Alessandro Drago (Ferrara U. & INFN sez. Ferrara)
|
Time-reversal odd distribution functions in chiral models with vector
mesons
|
4 pages
|
Phys.Rev. D71 (2005) 057501
|
10.1103/PhysRevD.71.057501
| null |
hep-ph
| null |
The so-called time-reversal odd distribution functions are known to be
non-vanishing in QCD due to the presence of the link operator in the definition
of these quantities. I show that T-odd distributions can be non-vanishing also
in chiral models, if vector mesons are introduced as dynamical gauge bosons of
a hidden local symmetry. Moreover, since the flavor dependence of these
distributions is different in chiral models respect to non chiral ones, the
phenomenological analysis of experimental data will be able to distinguish
between these two classes of models.
|
[
{
"created": "Sun, 30 Jan 2005 23:54:55 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Drago",
"Alessandro",
"",
"Ferrara U. & INFN sez. Ferrara"
]
] |
The so-called time-reversal odd distribution functions are known to be non-vanishing in QCD due to the presence of the link operator in the definition of these quantities. I show that T-odd distributions can be non-vanishing also in chiral models, if vector mesons are introduced as dynamical gauge bosons of a hidden local symmetry. Moreover, since the flavor dependence of these distributions is different in chiral models respect to non chiral ones, the phenomenological analysis of experimental data will be able to distinguish between these two classes of models.
|
hep-ph/9710276
|
Yuval Grossman
|
Yuval Grossman
|
Sneutrino Mixing
|
11 pages, latex, using iopconf1 and axodraw; one figure included.
Talk presented at ``Beyond the Desert'' Workshop, Castle Ringberg, Tegernsee,
Germany, 8-14 June 1997
| null | null |
SLAC-PUB-7671
|
hep-ph
| null |
In supersymmetric models with nonvanishing Majorana neutrino masses, the
sneutrino and antisneutrino mix. The conditions under which this mixing is
experimentally observable are studied, and mass-splitting of the sneutrino mass
eigenstates and sneutrino oscillation phenomena are analyzed.
|
[
{
"created": "Tue, 7 Oct 1997 20:58:56 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Grossman",
"Yuval",
""
]
] |
In supersymmetric models with nonvanishing Majorana neutrino masses, the sneutrino and antisneutrino mix. The conditions under which this mixing is experimentally observable are studied, and mass-splitting of the sneutrino mass eigenstates and sneutrino oscillation phenomena are analyzed.
|
2212.03272
|
Enrico Trotti
|
Enrico Trotti, Shahriyar Jafarzade and Francesco Giacosa
|
Thermodynamics of the Glueball Resonance Gas
|
18 pages, 6 figures
| null |
10.1140/epjc/s10052-023-11557-0
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the thermodynamic properties -- pressure, entropy and trace anomaly
-- of a gas of glueballs that includes the glueball states obtained by various
lattice simulations. We show that this model, called Glueball Resonance Gas
(GRG) approach, describes well the thermal properties of the Yang-Mills sector
of QCD below the critical temperature $T_c$, provided that $T_c$ is properly
matched to the corresponding determination of the glueball masses, obtaining
$T_c \sim 320 \pm 20$ MeV. The inclusion into the GRG of heavier glueballs not
yet seen on the lattice, assuming that glueballs follow Regge trajectories as
quark-antiquark states do, leads only to a small correction. We consider the
contribution to the pressure of the interactions between scalar-scalar and
tensor-tensor glueballs, which turn out to be also negligible.
|
[
{
"created": "Tue, 6 Dec 2022 19:02:49 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Dec 2022 10:57:19 GMT",
"version": "v2"
}
] |
2023-05-24
|
[
[
"Trotti",
"Enrico",
""
],
[
"Jafarzade",
"Shahriyar",
""
],
[
"Giacosa",
"Francesco",
""
]
] |
We study the thermodynamic properties -- pressure, entropy and trace anomaly -- of a gas of glueballs that includes the glueball states obtained by various lattice simulations. We show that this model, called Glueball Resonance Gas (GRG) approach, describes well the thermal properties of the Yang-Mills sector of QCD below the critical temperature $T_c$, provided that $T_c$ is properly matched to the corresponding determination of the glueball masses, obtaining $T_c \sim 320 \pm 20$ MeV. The inclusion into the GRG of heavier glueballs not yet seen on the lattice, assuming that glueballs follow Regge trajectories as quark-antiquark states do, leads only to a small correction. We consider the contribution to the pressure of the interactions between scalar-scalar and tensor-tensor glueballs, which turn out to be also negligible.
|
1101.2584
|
Egle Tomasi-Gustafsson
|
G. I. Gakh, N. P. Merenkov and E. Tomasi-Gustafsson
|
Analysis of polarization observables and radiative effects for the
reaction $\bar p+p\rightarrow e^++e^-$
|
18 pages, 8 figures
|
Phys.Rev.C83:045202,2011
|
10.1103/PhysRevC.83.045202
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The expressions for the differential cross section and of the polarization
observables for the reaction $\bar p+p\rightarrow e^++e^-$ are given in terms
of the nucleon electromagnetic form factors in the laboratory system. Radiative
corrections due to the emission of virtual and real soft photons from the
leptons are also calculated. Unlike the center-of- mass system case, they
depend on the scattering angle. Polarization effects are derived in the case
when the antiproton beam, the target and the electron in the final state are
polarized. Numerical estimations have been done for all observables for the
PANDA experimental conditions using models for the nucleon electromagnetic form
factors in the time-like region. The radiative corrections to the differential
cross section are calculated as function of the beam energy and of the electron
angle.
|
[
{
"created": "Thu, 13 Jan 2011 15:34:56 GMT",
"version": "v1"
}
] |
2015-03-17
|
[
[
"Gakh",
"G. I.",
""
],
[
"Merenkov",
"N. P.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] |
The expressions for the differential cross section and of the polarization observables for the reaction $\bar p+p\rightarrow e^++e^-$ are given in terms of the nucleon electromagnetic form factors in the laboratory system. Radiative corrections due to the emission of virtual and real soft photons from the leptons are also calculated. Unlike the center-of- mass system case, they depend on the scattering angle. Polarization effects are derived in the case when the antiproton beam, the target and the electron in the final state are polarized. Numerical estimations have been done for all observables for the PANDA experimental conditions using models for the nucleon electromagnetic form factors in the time-like region. The radiative corrections to the differential cross section are calculated as function of the beam energy and of the electron angle.
|
1308.0320
|
Diptimoy Ghosh
|
Diptimoy Ghosh (INFN, Rome and Fermilab)
|
Boosted di-boson from a mixed heavy stop
|
One reference added. To appear in Physical Review D
|
Phys.Rev. D88 (2013) 115013
|
10.1103/PhysRevD.88.115013
|
FERMILAB-PUB-13-306-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lighter mass eigenstate ($\widetilde{t}_1$) of the two top squarks, the
scalar superpartners of the top quark, is extremely difficult to discover if it
is almost degenerate with the lightest neutralino ($\widetilde{\chi}_1^0$), the
lightest and stable supersymmetric particle in the R-parity conserving
supersymmetry. The current experimental bound on $\widetilde{t}_1$ mass in this
scenario stands only around 200 GeV. For such a light $\widetilde{t}_1$, the
heavier top squark ($\widetilde{t}_2$) can also be around the TeV scale.
Moreover, the high value of the higgs ($h$) mass prefers the left and right
handed top squarks to be highly mixed allowing the possibility of a
considerable branching ratio for $\widetilde{t}_2 \to \widetilde{t}_1 h$ and
$\widetilde{t}_2 \to \widetilde{t}_1 Z$. In this paper, we explore the above
possibility together with the pair production of $\widetilde{t}_2$
$\widetilde{t}_2^*$ giving rise to the spectacular di-boson + missing
transverse energy final state. For an approximately 1 TeV $\widetilde{t}_2$ and
a few hundred GeV $\widetilde{t}_1$ the final state particles can be moderately
boosted which encourages us to propose a novel search strategy employing the
jet substructure technique to tag the boosted $h$ and $Z$. The reconstruction
of the $h$ and $Z$ momenta also allows us to construct the stransverse mass
$M_{T2}$ providing an additional efficient handle to fight the backgrounds. We
show that a 4--5$\sigma$ signal can be observed at the 14 TeV LHC for $\sim$ 1
TeV $\widetilde{t}_2$ with 100 fb$^{-1}$ integrated luminosity.
|
[
{
"created": "Thu, 1 Aug 2013 19:51:16 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Nov 2013 19:51:17 GMT",
"version": "v2"
}
] |
2013-12-30
|
[
[
"Ghosh",
"Diptimoy",
"",
"INFN, Rome and Fermilab"
]
] |
The lighter mass eigenstate ($\widetilde{t}_1$) of the two top squarks, the scalar superpartners of the top quark, is extremely difficult to discover if it is almost degenerate with the lightest neutralino ($\widetilde{\chi}_1^0$), the lightest and stable supersymmetric particle in the R-parity conserving supersymmetry. The current experimental bound on $\widetilde{t}_1$ mass in this scenario stands only around 200 GeV. For such a light $\widetilde{t}_1$, the heavier top squark ($\widetilde{t}_2$) can also be around the TeV scale. Moreover, the high value of the higgs ($h$) mass prefers the left and right handed top squarks to be highly mixed allowing the possibility of a considerable branching ratio for $\widetilde{t}_2 \to \widetilde{t}_1 h$ and $\widetilde{t}_2 \to \widetilde{t}_1 Z$. In this paper, we explore the above possibility together with the pair production of $\widetilde{t}_2$ $\widetilde{t}_2^*$ giving rise to the spectacular di-boson + missing transverse energy final state. For an approximately 1 TeV $\widetilde{t}_2$ and a few hundred GeV $\widetilde{t}_1$ the final state particles can be moderately boosted which encourages us to propose a novel search strategy employing the jet substructure technique to tag the boosted $h$ and $Z$. The reconstruction of the $h$ and $Z$ momenta also allows us to construct the stransverse mass $M_{T2}$ providing an additional efficient handle to fight the backgrounds. We show that a 4--5$\sigma$ signal can be observed at the 14 TeV LHC for $\sim$ 1 TeV $\widetilde{t}_2$ with 100 fb$^{-1}$ integrated luminosity.
|
hep-ph/0604036
|
Eduardo Souza Fraga
|
Bruno G. Taketani and Eduardo S. Fraga
|
Effects from inhomogeneities in the chiral transition
|
11 pages, 5 figures. v2: appendix and references added, published
version
|
Phys.Rev. D74 (2006) 085013
|
10.1103/PhysRevD.74.085013
| null |
hep-ph hep-th nucl-th
| null |
We consider an approximation procedure to evaluate the finite-temperature
one-loop fermionic density in the presence of a chiral background field which
systematically incorporates effects from inhomogeneities in the chiral field
through a derivative expansion. We apply the method to the case of a simple
low-energy effective chiral model which is commonly used in the study of the
chiral phase transition, the linear sigma-model coupled to quarks. The
modifications in the effective potential and their consequences for the bubble
nucleation process are discussed.
|
[
{
"created": "Tue, 4 Apr 2006 20:40:59 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2006 18:05:37 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Taketani",
"Bruno G.",
""
],
[
"Fraga",
"Eduardo S.",
""
]
] |
We consider an approximation procedure to evaluate the finite-temperature one-loop fermionic density in the presence of a chiral background field which systematically incorporates effects from inhomogeneities in the chiral field through a derivative expansion. We apply the method to the case of a simple low-energy effective chiral model which is commonly used in the study of the chiral phase transition, the linear sigma-model coupled to quarks. The modifications in the effective potential and their consequences for the bubble nucleation process are discussed.
|
hep-ph/9801437
|
Rmt
|
M. Masip, R. Munoz-Tapia and A. Pomarol
|
Limits on the mass of the lightest Higgs in supersymmetric models
|
11pages, LaTex, uses epsfig, 3 figures
|
Phys.Rev.D57:R5340,1998
|
10.1103/PhysRevD.57.5340
|
UG-FT-84/97, UAB-FT-436
|
hep-ph
| null |
In supersymmetric models extended with a gauge singlet the mass of the
lightest Higgs boson has contributions proportional to the adimensional
coupling $\lambda$. In minimal scenarios, the requirement that this coupling
remains perturbative up to the unification scale constrains $\lambda$ to be
smaller than $\approx 0.7$. We study the maximum value of $\lambda$ consistent
with a perturbative unification of the gauge couplings in models containing
nonstandard fields at intermediate scales. These fields appear in scenarios
with gauge mediation of supersymmetry breaking. We find that the presence of
extra fields can raise the maximum value of $\lambda$ up to a 19%, increasing
the limits on the mass of the lightest Higgs from 135 GeV to 155 GeV.
|
[
{
"created": "Thu, 29 Jan 1998 20:09:00 GMT",
"version": "v1"
}
] |
2009-12-30
|
[
[
"Masip",
"M.",
""
],
[
"Munoz-Tapia",
"R.",
""
],
[
"Pomarol",
"A.",
""
]
] |
In supersymmetric models extended with a gauge singlet the mass of the lightest Higgs boson has contributions proportional to the adimensional coupling $\lambda$. In minimal scenarios, the requirement that this coupling remains perturbative up to the unification scale constrains $\lambda$ to be smaller than $\approx 0.7$. We study the maximum value of $\lambda$ consistent with a perturbative unification of the gauge couplings in models containing nonstandard fields at intermediate scales. These fields appear in scenarios with gauge mediation of supersymmetry breaking. We find that the presence of extra fields can raise the maximum value of $\lambda$ up to a 19%, increasing the limits on the mass of the lightest Higgs from 135 GeV to 155 GeV.
|
hep-ph/0105344
|
Matej Pavsic
|
Matej Pavsic
|
External Inversion, Internal Inversion, and Reflection Invariance
|
15 pages. An early proposal of "mirror matter", published in 1974.
This is an exact copy of the published paper. I am posting it here because of
the increasing interest in the "exact parity models" and its experimental
consequences
|
Int.J.Theor.Phys.9:229-244,1974
|
10.1007/BF01810695
| null |
hep-ph hep-th
| null |
Having in mind that physical systems have different levels of structure we
develop the concept of external, internal and total improper Lorentz
transformation (space inversion and time reversal). A particle obtained from
the ordinary one by the application of internal space inversion or time
reversal is generally a different particle. From this point of view the
intrinsic parity of a nuclear particle (`elementary particle') is in fact the
external intrinsic parity, if we take into account the internal structure of a
particle. We show that non-conservation of the external parity does not
necessarily imply non-invariance of nature under space inversion. The
conventional theory of beta-decay can be corrected by including the internal
degrees of freedom to become invariant under total space inversion, though not
under the external one.
|
[
{
"created": "Thu, 31 May 2001 17:21:25 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Pavsic",
"Matej",
""
]
] |
Having in mind that physical systems have different levels of structure we develop the concept of external, internal and total improper Lorentz transformation (space inversion and time reversal). A particle obtained from the ordinary one by the application of internal space inversion or time reversal is generally a different particle. From this point of view the intrinsic parity of a nuclear particle (`elementary particle') is in fact the external intrinsic parity, if we take into account the internal structure of a particle. We show that non-conservation of the external parity does not necessarily imply non-invariance of nature under space inversion. The conventional theory of beta-decay can be corrected by including the internal degrees of freedom to become invariant under total space inversion, though not under the external one.
|
hep-ph/0407208
|
Elvio Di Salvo
|
E. Di Salvo
|
Q^2 Dependence of the azimuthal Asymmetry in Unpolarized Drell-Yan
|
15 pages, 4 figures. Presented at "HiX2004", Marseille, July 26-28,
2004
| null |
10.1063/1.1871665
| null |
hep-ph
| null |
We study the azimuthal asymmetry of the unpolarized Drell-Yan in the
framework of the T-odd functions. We find, on the basis of quite general
arguments, that for |{\bf q}_{\perp}| << Q such an asymmetry decreases as
Q^{-2}, where {\bf q}_{\perp} and Q are respectively the transverse momentum
and the center-of-mass energy of the muon pair. The experimental results
support this conclusion.
|
[
{
"created": "Mon, 19 Jul 2004 10:32:58 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Di Salvo",
"E.",
""
]
] |
We study the azimuthal asymmetry of the unpolarized Drell-Yan in the framework of the T-odd functions. We find, on the basis of quite general arguments, that for |{\bf q}_{\perp}| << Q such an asymmetry decreases as Q^{-2}, where {\bf q}_{\perp} and Q are respectively the transverse momentum and the center-of-mass energy of the muon pair. The experimental results support this conclusion.
|
1706.06728
|
Kazuhiro Watanabe
|
Hirotsugu Fujii, Kazuhiro Watanabe
|
Nuclear modification of forward $D$ production in pPb collisions at the
LHC
|
12 pages, 3 figures; v2: typo in (3) corrected
| null | null |
JLAB-THY-17-2506
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study nuclear modification factors for single $D$ meson and semileptonic
decay lepton $l$ ($=e,\mu$) production in minimum bias proton-nucleus (p$A$)
collisions at the LHC in the color-glass-condensate (CGC) framework at leading
order in strong coupling. In our numerical computations, transverse momentum
($k_\perp$) dependent multi-point Wilson line correlators are employed for
describing target nucleus for p$A$ and proton for pp. The projectile proton is
treated with unintegrated gluon distribution function, which is also
$k_\perp$-dependent. The rapidity evolutions of these functions in the small
Bjorken $x$ region are taken into account by solving running coupling
Balitsky-Kovchegov (BK) equation at leading logarithmic accuracy. For
simplicity, we employ Kartvelishvili's type fragmentation function and a simple
model for lepton energy distribution from seileptonic decay, respectively, to
compute differential cross sections for $D$ and $l$ production. The gluon
saturation scale inside the heavy nucleus is enhanced and dependent on $x$,
which we take into account by replacing the initial saturation scale in the BK
equation with a larger value for the heavy nucleus. We show that the saturation
effect leads to perceptible nuclear suppression of $D$ production at forward
rapidity. Our numerical results predict similar nuclear suppressions in p$A$
collisions for forward $l$ production at lower transverse momentum
$p_\perp<2\;{\rm GeV}$. Numerical tables on the nuclear modifications of $D$
and $l$ are listed in this note.
|
[
{
"created": "Wed, 21 Jun 2017 03:17:13 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2018 04:51:03 GMT",
"version": "v2"
}
] |
2018-02-06
|
[
[
"Fujii",
"Hirotsugu",
""
],
[
"Watanabe",
"Kazuhiro",
""
]
] |
We study nuclear modification factors for single $D$ meson and semileptonic decay lepton $l$ ($=e,\mu$) production in minimum bias proton-nucleus (p$A$) collisions at the LHC in the color-glass-condensate (CGC) framework at leading order in strong coupling. In our numerical computations, transverse momentum ($k_\perp$) dependent multi-point Wilson line correlators are employed for describing target nucleus for p$A$ and proton for pp. The projectile proton is treated with unintegrated gluon distribution function, which is also $k_\perp$-dependent. The rapidity evolutions of these functions in the small Bjorken $x$ region are taken into account by solving running coupling Balitsky-Kovchegov (BK) equation at leading logarithmic accuracy. For simplicity, we employ Kartvelishvili's type fragmentation function and a simple model for lepton energy distribution from seileptonic decay, respectively, to compute differential cross sections for $D$ and $l$ production. The gluon saturation scale inside the heavy nucleus is enhanced and dependent on $x$, which we take into account by replacing the initial saturation scale in the BK equation with a larger value for the heavy nucleus. We show that the saturation effect leads to perceptible nuclear suppression of $D$ production at forward rapidity. Our numerical results predict similar nuclear suppressions in p$A$ collisions for forward $l$ production at lower transverse momentum $p_\perp<2\;{\rm GeV}$. Numerical tables on the nuclear modifications of $D$ and $l$ are listed in this note.
|
hep-ph/9906511
|
Ivan Schmidt
|
Hung-Jung Lu (Knowledge Adventure Inc., Glendale, CA), Rodrigo Rivera
and Ivan Schmidt (Univ. Federico Santa Maria, Valparaiso, Chile)
|
Peripheral Meson Model of Deep Inelastic Rapidity Gap Events
|
12 pages, 2 figures
|
Phys.Lett. B484 (2000) 35-42
|
10.1016/S0370-2693(00)00627-4
|
USM-TH-76
|
hep-ph
| null |
We show that a peripheral meson model can explain the large deep inelastic
electron-proton scattering rapidity gap events observed at HERA.
|
[
{
"created": "Fri, 25 Jun 1999 22:28:15 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Lu",
"Hung-Jung",
"",
"Knowledge Adventure Inc., Glendale, CA"
],
[
"Rivera",
"Rodrigo",
"",
"Univ. Federico Santa Maria, Valparaiso, Chile"
],
[
"Schmidt",
"Ivan",
"",
"Univ. Federico Santa Maria, Valparaiso, Chile"
]
] |
We show that a peripheral meson model can explain the large deep inelastic electron-proton scattering rapidity gap events observed at HERA.
|
1604.02157
|
R. Sekhar Chivukula
|
R. Sekhar Chivukula, Arsham Farzinnia, Kirtimaan Mohan and Elizabeth
H. Simmons
|
Diphoton Resonances in the Renormalizable Coloron Model
|
18 pages, 5 figures. (Modified to respond to referee comments,
discussion of Landau poles in scalar couplings added.)
|
Phys. Rev. D 94, 035018 (2016)
|
10.1103/PhysRevD.94.035018
|
MSUHEP-160407
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The renormalizable coloron model, which has previously been shown in the
literature to be consistent with a wide array of theoretical and precision
electroweak constraints, includes a pair of spinless bosons (one scalar, one
pseudoscalar). We show that either of them, or both together if they are
degenerate, could be responsible for the diphoton resonance signal for which
both CMS and ATLAS have seen evidence. Because either of these bosons would be
produced and decay through loops of spectator fermions, the absence of signals
in dijet, $t\bar{t}$, and electroweak boson pair channels is not a surprise.
|
[
{
"created": "Thu, 7 Apr 2016 20:02:29 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2016 19:45:46 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Apr 2016 22:29:12 GMT",
"version": "v3"
},
{
"created": "Fri, 15 Jul 2016 16:26:23 GMT",
"version": "v4"
}
] |
2016-08-31
|
[
[
"Chivukula",
"R. Sekhar",
""
],
[
"Farzinnia",
"Arsham",
""
],
[
"Mohan",
"Kirtimaan",
""
],
[
"Simmons",
"Elizabeth H.",
""
]
] |
The renormalizable coloron model, which has previously been shown in the literature to be consistent with a wide array of theoretical and precision electroweak constraints, includes a pair of spinless bosons (one scalar, one pseudoscalar). We show that either of them, or both together if they are degenerate, could be responsible for the diphoton resonance signal for which both CMS and ATLAS have seen evidence. Because either of these bosons would be produced and decay through loops of spectator fermions, the absence of signals in dijet, $t\bar{t}$, and electroweak boson pair channels is not a surprise.
|
hep-ph/0101155
|
Havard B. Sandvik
|
J. Magueijo, H. Sandvik and T.W.B. Kibble
|
Nielsen-Olesen vortex in varying-alpha theories
|
7 pages, 1 figure
|
Phys.Rev. D64 (2001) 023521
|
10.1103/PhysRevD.64.023521
| null |
hep-ph astro-ph
| null |
We consider soliton solutions to Bekenstein's theory, for which the fine
structure constant $\alpha=e^2/(4\pi\hbar c)$ is allowed to vary due to the
presence of a dielectric field pervading the vacuum. More specifically we
investigate the effects of a varying $\alpha$ upon a complex scalar field with
a U(1) electromagnetic gauge symmetry subject to spontaneous symmetry breaking.
We find vortex solutions to this theory, similar to the Nielsen-Olesen vortex.
Near the vortex core the electric charge is typically much larger than far away
from the string, lending these strings a superconducting flavour. In general
the dielectric field coats the usual local string with a global string
envelope. We discuss the cosmological implications of networks of such strings,
with particular emphasis on their ability to generate inhomogeneous
recombination scenarios. We also consider the possibility of the dielectric
being a charged free field. Even though the vacuum of such a field is trivial,
we find that the dielectric arranges itself in the shape of a local string,
with a quantized magnetic flux at the core -- presumably borrowing these
topological features from the underlying Nielsen-Olesen vortex.
|
[
{
"created": "Mon, 15 Jan 2001 12:21:15 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2001 18:58:10 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Magueijo",
"J.",
""
],
[
"Sandvik",
"H.",
""
],
[
"Kibble",
"T. W. B.",
""
]
] |
We consider soliton solutions to Bekenstein's theory, for which the fine structure constant $\alpha=e^2/(4\pi\hbar c)$ is allowed to vary due to the presence of a dielectric field pervading the vacuum. More specifically we investigate the effects of a varying $\alpha$ upon a complex scalar field with a U(1) electromagnetic gauge symmetry subject to spontaneous symmetry breaking. We find vortex solutions to this theory, similar to the Nielsen-Olesen vortex. Near the vortex core the electric charge is typically much larger than far away from the string, lending these strings a superconducting flavour. In general the dielectric field coats the usual local string with a global string envelope. We discuss the cosmological implications of networks of such strings, with particular emphasis on their ability to generate inhomogeneous recombination scenarios. We also consider the possibility of the dielectric being a charged free field. Even though the vacuum of such a field is trivial, we find that the dielectric arranges itself in the shape of a local string, with a quantized magnetic flux at the core -- presumably borrowing these topological features from the underlying Nielsen-Olesen vortex.
|
1611.02846
|
Jenny List
|
Howard Baer, Mikael Berggren, Keisuke Fujii, Suvi-Leena Lehtinen,
Jenny List, Tomohiko Tanabe, Jacqueline Yan
|
Naturalness and light higgsinos: A powerful reason to build the ILC
|
5pages plus title page, proceedings ICHEP 2016
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A core prediction of natural Supersymmetry is the existence of four light
higgsinos not too far above the mass of the $Z$ boson. The small mass
splittings amongst the higgsinos -- typically 5-20\,GeV -- imply very little
visible energy release from decays of heavier higgsinos. In particular, if
other SUSY particles are quite heavy, as can be the case in SUSY with
radiatively-driven naturalness, the higgsinos are extremely hard to detect at
hadron colliders. The clean environment of electron-positron colliders with
$\sqrt{s} > 2m_{\mathrm{higgsino}}$, however, would allow for a decisive search
for the required light higgsinos. Thus, $e^+e^-$ colliders should either
discover or exclude natural SUSY. We present a detailed study of higgsino pair
production at the proposed International Linear $e^+e^-$ Collider which is
under consideration for construction in Japan. A variety of precision
measurements should allow for extraction of underlying parameters and provide a
window onto physics at the grand unified scale.
|
[
{
"created": "Wed, 9 Nov 2016 08:29:12 GMT",
"version": "v1"
}
] |
2016-11-10
|
[
[
"Baer",
"Howard",
""
],
[
"Berggren",
"Mikael",
""
],
[
"Fujii",
"Keisuke",
""
],
[
"Lehtinen",
"Suvi-Leena",
""
],
[
"List",
"Jenny",
""
],
[
"Tanabe",
"Tomohiko",
""
],
[
"Yan",
"Jacqueline",
""
]
] |
A core prediction of natural Supersymmetry is the existence of four light higgsinos not too far above the mass of the $Z$ boson. The small mass splittings amongst the higgsinos -- typically 5-20\,GeV -- imply very little visible energy release from decays of heavier higgsinos. In particular, if other SUSY particles are quite heavy, as can be the case in SUSY with radiatively-driven naturalness, the higgsinos are extremely hard to detect at hadron colliders. The clean environment of electron-positron colliders with $\sqrt{s} > 2m_{\mathrm{higgsino}}$, however, would allow for a decisive search for the required light higgsinos. Thus, $e^+e^-$ colliders should either discover or exclude natural SUSY. We present a detailed study of higgsino pair production at the proposed International Linear $e^+e^-$ Collider which is under consideration for construction in Japan. A variety of precision measurements should allow for extraction of underlying parameters and provide a window onto physics at the grand unified scale.
|
hep-ph/9712484
|
W. Porod
|
A. Bartl, F. de Campos, M. A. Garcia-Jareno, M. B. Magro, W.
Majerotto, W. Porod, J. W. F. Valle
|
Gluino Cascade Decays With Broken R--Parity
|
5 pages LaTeX including 2 figures, uses sprocl.sty. Talk presented by
W. Porod at the "International Workshop on Physics Beyond The Standard Model:
from Theory to Experiment", October 13 - 17, 1997, Valencia, Spain
| null | null |
UWThPh-1997-50, HEPHY-PUB 683/97
|
hep-ph
| null |
We study the pattern of gluino cascade decays in a class of supersymmetric
models where R-parity is spontaneously broken. The multi-lepton and same-sign
dilepton rates in these models are compared with those of the Minimal
Supersymmetric Standard Model. We show that these rates can be substantially
enhanced in models with broken R-parity.
|
[
{
"created": "Mon, 22 Dec 1997 15:21:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bartl",
"A.",
""
],
[
"de Campos",
"F.",
""
],
[
"Garcia-Jareno",
"M. A.",
""
],
[
"Magro",
"M. B.",
""
],
[
"Majerotto",
"W.",
""
],
[
"Porod",
"W.",
""
],
[
"Valle",
"J. W. F.",
""
]
] |
We study the pattern of gluino cascade decays in a class of supersymmetric models where R-parity is spontaneously broken. The multi-lepton and same-sign dilepton rates in these models are compared with those of the Minimal Supersymmetric Standard Model. We show that these rates can be substantially enhanced in models with broken R-parity.
|
2311.12934
|
Yan Luo
|
Qing-Hong Cao, Jinhui Guo, Jia Liu, Yan Luo, Xiao-Ping Wang
|
Long-lived Searches of Vector-like Lepton and Its Accompanying Scalar at
Colliders
|
33 pages, 9 figures; v2: matched to journal version
|
Phys. Rev. D 110, 015029 (2024)
|
10.1103/PhysRevD.110.015029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the vector-like leptons (VLLs) as a simple extension to the
standard model (SM) have attracted widespread attention both in theory and
experiments. The present collider searches mainly focus on the studies of their
prompt decays, which prefer a relatively large coupling. In this paper, we
concentrate on searches for long-lived signatures of the singlet VLLs $F$ or
their accompanying scalar particles $\phi$ both in the hadronic and electronic
colliders. The long-lived signatures are naturally induced from small chiral
mass mixing between VLLs and SM leptons. Two specific models distinguished by
whether the VLLs couple to scalar particles are introduced to realize the
aforementioned features. For long-lived VLLs case, we find that with the kink
track method the sensitivities at future HL-LHC with $\sqrt{s}=14~\text{TeV}$
can reach the regions for VLL mass $m_F \in [200,1100]~\text{GeV}$ and the mass
mixing parameter $\theta_L \in [10^{-10},3\times 10^{-8}]$. For the long-lived
accompanying scalar particle case, by fixing VLLs or scalar mass, or the mass
ratio between VLL and the accompanying scalar, we explore the projected
sensitivities through the time delay and displaced vertex strategies, which can
probe the regions for $m_F \in [200,1200]~\text{GeV}$ and coupling
$y\theta_L\in [10^{-11},10^{-6}]$. Furthermore, we also explore the long-lived
accompanying scalars at the future CEPC provided that the VLLs can couple to
the SM first-generation leptons. We find that CEPC has good performances for
$m_\phi < 120~\text{GeV}$ and $m_F<1200~\text{GeV}$. These long-lived searches
are complementary to previous studies, which opens the door towards the smaller
coupling regions.
|
[
{
"created": "Tue, 21 Nov 2023 19:00:13 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2024 08:43:31 GMT",
"version": "v2"
}
] |
2024-07-31
|
[
[
"Cao",
"Qing-Hong",
""
],
[
"Guo",
"Jinhui",
""
],
[
"Liu",
"Jia",
""
],
[
"Luo",
"Yan",
""
],
[
"Wang",
"Xiao-Ping",
""
]
] |
Recently, the vector-like leptons (VLLs) as a simple extension to the standard model (SM) have attracted widespread attention both in theory and experiments. The present collider searches mainly focus on the studies of their prompt decays, which prefer a relatively large coupling. In this paper, we concentrate on searches for long-lived signatures of the singlet VLLs $F$ or their accompanying scalar particles $\phi$ both in the hadronic and electronic colliders. The long-lived signatures are naturally induced from small chiral mass mixing between VLLs and SM leptons. Two specific models distinguished by whether the VLLs couple to scalar particles are introduced to realize the aforementioned features. For long-lived VLLs case, we find that with the kink track method the sensitivities at future HL-LHC with $\sqrt{s}=14~\text{TeV}$ can reach the regions for VLL mass $m_F \in [200,1100]~\text{GeV}$ and the mass mixing parameter $\theta_L \in [10^{-10},3\times 10^{-8}]$. For the long-lived accompanying scalar particle case, by fixing VLLs or scalar mass, or the mass ratio between VLL and the accompanying scalar, we explore the projected sensitivities through the time delay and displaced vertex strategies, which can probe the regions for $m_F \in [200,1200]~\text{GeV}$ and coupling $y\theta_L\in [10^{-11},10^{-6}]$. Furthermore, we also explore the long-lived accompanying scalars at the future CEPC provided that the VLLs can couple to the SM first-generation leptons. We find that CEPC has good performances for $m_\phi < 120~\text{GeV}$ and $m_F<1200~\text{GeV}$. These long-lived searches are complementary to previous studies, which opens the door towards the smaller coupling regions.
|
1708.03580
|
Debashis Saha
|
Pankaj Agrawal, Debashis Saha, Ambresh Shivaji
|
Production of $HHH$ and $HHV(V=\gamma,Z)$ at the hadron colliders
|
Version to be appeared in PRD
|
Phys. Rev. D 97, 036006 (2018)
|
10.1103/PhysRevD.97.036006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the production of two Higgs bosons in association with a gauge
boson or another Higgs boson at the hadron colliders. We compute the cross
sections and distributions for the processes $ p p \to H H H $ and $H H Z$
within the standard model. In particular, we compute the gluon-gluon fusion
one-loop contributions mediated via heavy quarks in the loop. It is the leading
order contribution to $ p p \to H H H $ process. To the process $ p p \to H H Z
$, it is next-to-next-to-leading-order (NNLO) contribution in QCD coupling. We
also compare this contribution to the next-to-leading-order (NLO) QCD
contribution to this process. The NNLO contribution can be similar to NLO
contribution at the Large Hadron Collider (LHC), and significantly more at
higher center-of-mass energy machines. We also study new physics effects in
these processes by considering $ttH, HHH, HHHH, HZZ$, and $HHZZ$ interactions
as anomalous. The anomalous couplings can enhance the cross sections
significantly. The $gg \to HHH$ process is specially sensitive to anomalous
trilinear Higgs boson self-coupling. For the $gg \to HHZ$ process, there is
some modest dependence on anomalous $HZZ$ couplings.
|
[
{
"created": "Fri, 11 Aug 2017 15:50:06 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Jan 2018 09:24:33 GMT",
"version": "v2"
}
] |
2018-02-21
|
[
[
"Agrawal",
"Pankaj",
""
],
[
"Saha",
"Debashis",
""
],
[
"Shivaji",
"Ambresh",
""
]
] |
We consider the production of two Higgs bosons in association with a gauge boson or another Higgs boson at the hadron colliders. We compute the cross sections and distributions for the processes $ p p \to H H H $ and $H H Z$ within the standard model. In particular, we compute the gluon-gluon fusion one-loop contributions mediated via heavy quarks in the loop. It is the leading order contribution to $ p p \to H H H $ process. To the process $ p p \to H H Z $, it is next-to-next-to-leading-order (NNLO) contribution in QCD coupling. We also compare this contribution to the next-to-leading-order (NLO) QCD contribution to this process. The NNLO contribution can be similar to NLO contribution at the Large Hadron Collider (LHC), and significantly more at higher center-of-mass energy machines. We also study new physics effects in these processes by considering $ttH, HHH, HHHH, HZZ$, and $HHZZ$ interactions as anomalous. The anomalous couplings can enhance the cross sections significantly. The $gg \to HHH$ process is specially sensitive to anomalous trilinear Higgs boson self-coupling. For the $gg \to HHZ$ process, there is some modest dependence on anomalous $HZZ$ couplings.
|
2102.02770
|
Matthew Feickert
|
Matthew Feickert and Benjamin Nachman
|
A Living Review of Machine Learning for Particle Physics
|
3 pages, 3 figures, GitHub repository of Living Review
https://github.com/iml-wg/HEPML-LivingReview
| null | null | null |
hep-ph cs.LG hep-ex physics.data-an stat.ML
|
http://creativecommons.org/licenses/by/4.0/
|
Modern machine learning techniques, including deep learning, are rapidly
being applied, adapted, and developed for high energy physics. Given the fast
pace of this research, we have created a living review with the goal of
providing a nearly comprehensive list of citations for those developing and
applying these approaches to experimental, phenomenological, or theoretical
analyses. As a living document, it will be updated as often as possible to
incorporate the latest developments. A list of proper (unchanging) reviews can
be found within. Papers are grouped into a small set of topics to be as useful
as possible. Suggestions and contributions are most welcome, and we provide
instructions for participating.
|
[
{
"created": "Tue, 2 Feb 2021 04:39:40 GMT",
"version": "v1"
}
] |
2021-02-05
|
[
[
"Feickert",
"Matthew",
""
],
[
"Nachman",
"Benjamin",
""
]
] |
Modern machine learning techniques, including deep learning, are rapidly being applied, adapted, and developed for high energy physics. Given the fast pace of this research, we have created a living review with the goal of providing a nearly comprehensive list of citations for those developing and applying these approaches to experimental, phenomenological, or theoretical analyses. As a living document, it will be updated as often as possible to incorporate the latest developments. A list of proper (unchanging) reviews can be found within. Papers are grouped into a small set of topics to be as useful as possible. Suggestions and contributions are most welcome, and we provide instructions for participating.
|
1307.1819
|
Thomas A. Trainor
|
Thomas A. Trainor and Duncan J. Prindle
|
Two-component model of 2D trigger-associated hadron correlations on
rapidity space $\bf y_{ta} \times y_{tt}$ derived from 1D $\bf p_t$ spectra
for p-p collisions at $\bf \sqrt{s} = 200$ GeV
|
16 pages, 11 figures
| null |
10.1103/PhysRevD.88.094018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A two-component model (TCM) for single-particle $p_t$ spectra describes 200
GeV p-p data accurately. Based on that TCM a spectrum hard component was
isolated that is related quantitatively to pQCD predictions for jet
fragmentation down to low jet energies ($\approx 3$ GeV). We here address
jet-related structure in 2D trigger-associated (TA) correlations as a
more-detailed method to explore the kinematic limits of low-energy jet
production and low-momentum jet fragment structure in p-p collisions. We derive
a TCM for p-p TA correlations that can be used to isolate 2D jet-related
structure. Inferred minimum-bias (mainly low-energy) jet-related TA
correlations may challenge several major assumptions about jet production in
p-p (and A-A) collisions. These results should be relevant to p-p
underlying-event studies and Monte Carlo predictions of multiple parton
interactions.
|
[
{
"created": "Sat, 6 Jul 2013 22:53:40 GMT",
"version": "v1"
}
] |
2015-06-16
|
[
[
"Trainor",
"Thomas A.",
""
],
[
"Prindle",
"Duncan J.",
""
]
] |
A two-component model (TCM) for single-particle $p_t$ spectra describes 200 GeV p-p data accurately. Based on that TCM a spectrum hard component was isolated that is related quantitatively to pQCD predictions for jet fragmentation down to low jet energies ($\approx 3$ GeV). We here address jet-related structure in 2D trigger-associated (TA) correlations as a more-detailed method to explore the kinematic limits of low-energy jet production and low-momentum jet fragment structure in p-p collisions. We derive a TCM for p-p TA correlations that can be used to isolate 2D jet-related structure. Inferred minimum-bias (mainly low-energy) jet-related TA correlations may challenge several major assumptions about jet production in p-p (and A-A) collisions. These results should be relevant to p-p underlying-event studies and Monte Carlo predictions of multiple parton interactions.
|
1511.04371
|
Samuel Wallon
|
R. Boussarie, B. Pire, L. Szymanowski and S. Wallon
|
On $\gamma N \to \gamma \rho N'$ at large $\gamma \rho$ invariant mass
|
5 pages, 3 figures; proceedings of PHOTON 2015: International
Conference on the Structure and the Interactions of the Photon, Novosibirsk,
Russia, 15 - 19 June, 2015
| null | null |
CPHT-PC053.1115, LPT-Orsay-15-84
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Photoproduction of a pair of particles with large invariant mass is a natural
extension of collinear QCD factorization theorems which have been much studied
for deeply virtual Compton scattering and deeply virtual meson production. We
consider the case where the wide angle Compton scattering subprocess $\gamma
(q\bar q) \to \gamma \rho $ factorizes from generalized parton distribution. At
dominant twist, separating the transverse (respectively longitudinal)
polarization of the $\rho$ meson allows one to get access to chiral-odd
(respectively chiral-even) GPDs. This opens a new way to the extraction of
these elusive transversity GPDs.
|
[
{
"created": "Fri, 13 Nov 2015 17:19:55 GMT",
"version": "v1"
}
] |
2015-11-16
|
[
[
"Boussarie",
"R.",
""
],
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wallon",
"S.",
""
]
] |
Photoproduction of a pair of particles with large invariant mass is a natural extension of collinear QCD factorization theorems which have been much studied for deeply virtual Compton scattering and deeply virtual meson production. We consider the case where the wide angle Compton scattering subprocess $\gamma (q\bar q) \to \gamma \rho $ factorizes from generalized parton distribution. At dominant twist, separating the transverse (respectively longitudinal) polarization of the $\rho$ meson allows one to get access to chiral-odd (respectively chiral-even) GPDs. This opens a new way to the extraction of these elusive transversity GPDs.
|
2306.14599
|
N\'estor G. Gracia
|
Nestor G. Gracia
|
Asymptoticity of QCD and massive, oriented event-shapes
|
307 pages, 100 figures
| null | null | null |
hep-ph hep-th
|
http://creativecommons.org/publicdomain/zero/1.0/
|
This is a doctoral thesis dissertation developed in the frame of theoretical
QCD predictions, with focus on two main topics. On the one hand, the
large-order bahavior of perturbative QCD series is discussed. By reviewing the
main literature, a cohesive discussion is made that includes the topics of
large-order divergencies in QCD, renormalons, summation methods for asymptotic
series and non-perturbative power corrections. A formalism for perturbative QCD
series in the large-$\beta_0$ is presented, which allows for (1) the
computation of the series, its renormalization factor and anomalous dimension,
(2) the sum of all these quantities, (3) the study of the renormalon structure
of the series and (4), the ambiguity in the sum due to IR renormalons, which is
associated with the size of non-power corrections. Original and published work
has been made to develop this formalism for both series without and with
cusp-anomalous dimension. A large number of applications of our formalism are
also presented, covering the short-distance mass schemes $\bar{\rm MS}$ and
MSR, the QCD-to-SCET and SCET-to-bHQET matching coeficients and the SCET and
bHQET jet functions. On the other hand, original and also published work in
fixed-order perturbation theory is also carried out in the field of event
shapes. The event-shape distribution for $e^+e^-$ to hadrons is computed to NLO
differential with respect to the angle between the initial beam and the thrust
axis of the event. The relevant finding is the presence of the quark mass
already at $\cal{O}(\alpha_s^0)$ for the vector current. Finally, the
dissertation also contains a brief study on the FOPT-CIPT difference in the
context of tau decays.
|
[
{
"created": "Mon, 26 Jun 2023 11:22:37 GMT",
"version": "v1"
}
] |
2023-06-27
|
[
[
"Gracia",
"Nestor G.",
""
]
] |
This is a doctoral thesis dissertation developed in the frame of theoretical QCD predictions, with focus on two main topics. On the one hand, the large-order bahavior of perturbative QCD series is discussed. By reviewing the main literature, a cohesive discussion is made that includes the topics of large-order divergencies in QCD, renormalons, summation methods for asymptotic series and non-perturbative power corrections. A formalism for perturbative QCD series in the large-$\beta_0$ is presented, which allows for (1) the computation of the series, its renormalization factor and anomalous dimension, (2) the sum of all these quantities, (3) the study of the renormalon structure of the series and (4), the ambiguity in the sum due to IR renormalons, which is associated with the size of non-power corrections. Original and published work has been made to develop this formalism for both series without and with cusp-anomalous dimension. A large number of applications of our formalism are also presented, covering the short-distance mass schemes $\bar{\rm MS}$ and MSR, the QCD-to-SCET and SCET-to-bHQET matching coeficients and the SCET and bHQET jet functions. On the other hand, original and also published work in fixed-order perturbation theory is also carried out in the field of event shapes. The event-shape distribution for $e^+e^-$ to hadrons is computed to NLO differential with respect to the angle between the initial beam and the thrust axis of the event. The relevant finding is the presence of the quark mass already at $\cal{O}(\alpha_s^0)$ for the vector current. Finally, the dissertation also contains a brief study on the FOPT-CIPT difference in the context of tau decays.
|
hep-ph/9311256
|
Pietro
|
Pietro Santorelli (Univ. of Napoli)
|
Rare $B$-Decays and Heavy to Light Semileptonic Transitions in the Isgur
and Wise Limit
|
9 pages, 1 Figure avalaible on request from SANTORELLI@NA.INFN.IT
|
Z.Phys.C61:449-452,1994
|
10.1007/BF01413184
| null |
hep-ph
| null |
From the experimental branching ratios for $B^- --> \rho^0 l^-\bar\nu_l$ and
$D^+ --> {\overl K}^{*0}({\overl K}^0) e^+ \nu_e$ one finds, in the Heavy Quark
Limit of $HQET$, $ |V_{bu}|=(8.1\pm 1.7) x 10^{-3}$, larger but consistent with
the actual quoted range $(2 - 7) x 10^{-3}$. In the same framework one predicts
for $R(B --> K^*\gamma)=( 2 \pm 2 ) 10^{-2}$.
|
[
{
"created": "Wed, 10 Nov 1993 10:02:44 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Santorelli",
"Pietro",
"",
"Univ. of Napoli"
]
] |
From the experimental branching ratios for $B^- --> \rho^0 l^-\bar\nu_l$ and $D^+ --> {\overl K}^{*0}({\overl K}^0) e^+ \nu_e$ one finds, in the Heavy Quark Limit of $HQET$, $ |V_{bu}|=(8.1\pm 1.7) x 10^{-3}$, larger but consistent with the actual quoted range $(2 - 7) x 10^{-3}$. In the same framework one predicts for $R(B --> K^*\gamma)=( 2 \pm 2 ) 10^{-2}$.
|
2306.17146
|
Wen Yin
|
Naoya Kitajima, Junseok Lee, Kai Murai, Fuminobu Takahashi, Wen Yin
|
Gravitational Waves from Domain Wall Collapse, and Application to
Nanohertz Signals with QCD-coupled Axions
|
v2: 9 pages, 6figures, 1 table, Lattice resolution significantly
improved. Conclusions unchanged
| null | null |
TU-1198
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study for the first time the gravitational waves generated during the
collapse of domain walls, incorporating the potential bias in the lattice
simulations. The final stages of domain wall collapse are crucial for the
production of gravitational waves, but have remained unexplored due to
computational difficulties. As a significant application of this new result, we
show that the observed NANOGrav, EPTA, PPTA, and CPTA data, which indicate
stochastic gravitational waves in the nanohertz regime, can be attributed to
axion domain walls coupled to QCD. In our model, non-perturbative effects of
QCD induce a temperature-dependent bias around the QCD crossover, inducing the
rapid collapse of the domain walls. We use sophisticated lattice simulations
that account for the temperature-dependent bias to measure the gravitational
waves resulting from the domain wall annihilation. We also discuss the future
prospects for accelerator-based searches for the axion and the potential for
the formation and detection of primordial black holes.
|
[
{
"created": "Thu, 29 Jun 2023 17:49:30 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Oct 2023 15:20:04 GMT",
"version": "v2"
}
] |
2023-10-05
|
[
[
"Kitajima",
"Naoya",
""
],
[
"Lee",
"Junseok",
""
],
[
"Murai",
"Kai",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yin",
"Wen",
""
]
] |
We study for the first time the gravitational waves generated during the collapse of domain walls, incorporating the potential bias in the lattice simulations. The final stages of domain wall collapse are crucial for the production of gravitational waves, but have remained unexplored due to computational difficulties. As a significant application of this new result, we show that the observed NANOGrav, EPTA, PPTA, and CPTA data, which indicate stochastic gravitational waves in the nanohertz regime, can be attributed to axion domain walls coupled to QCD. In our model, non-perturbative effects of QCD induce a temperature-dependent bias around the QCD crossover, inducing the rapid collapse of the domain walls. We use sophisticated lattice simulations that account for the temperature-dependent bias to measure the gravitational waves resulting from the domain wall annihilation. We also discuss the future prospects for accelerator-based searches for the axion and the potential for the formation and detection of primordial black holes.
|
1803.07605
|
Alexandre Deur
|
Alexandre Deur
|
The QCD running coupling at all scales and the connection between hadron
masses and \Lambda_s
|
Contribution to the proceedings of the 11th International Workshop on
the Physics of Excited Nucleons (NSTAR 2017) 11 pages, 2 figures
|
Few-Body Syst (2018) 59: 146
|
10.1007/s00601-018-1463-y
|
JLAB-PHY-18-2672. DOE/OR/23177-4401
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on recent experimental and theoretical developments in our
understanding of the QCD running coupling \alpha_s in QCD's nonperturbative
regime. They allow us to analytically compute the hadron mass spectrum, with
\Lambda_s the only input necessary to this determination. The computed spectra
agrees well with experimental data.
|
[
{
"created": "Tue, 20 Mar 2018 18:59:53 GMT",
"version": "v1"
}
] |
2018-11-15
|
[
[
"Deur",
"Alexandre",
""
]
] |
We report on recent experimental and theoretical developments in our understanding of the QCD running coupling \alpha_s in QCD's nonperturbative regime. They allow us to analytically compute the hadron mass spectrum, with \Lambda_s the only input necessary to this determination. The computed spectra agrees well with experimental data.
|
hep-ph/9807464
|
Silvano Simula
|
D. Melikhov, N. Nikitin and S. Simula
|
Probing right-handed currents in B -> K* l+ l- transitions
|
latex, 10 pp., 3 figures, submitted to Phys. Lett. B
|
Phys.Lett. B442 (1998) 381-389
|
10.1016/S0370-2693(98)01271-4
|
preprint INFN-RM3 98/1, July 1998
|
hep-ph
| null |
We discuss a possibility to probe right-handed weak hadronic currents in rare
semileptonic b -> s transitions. It is shown that within models involving
right-handed as well as left-handed quark currents (LR models) one can expect a
strong enhancement of the right-handed K* production in B -> K* l+ l- decays
compared with models including only left-handed quark currents (SM, MSSM).
Hence an experimental study of the transverse asymmetry of the produced K*
mesons provides a clear test of the presence of the right-handed quark currents
and a possibiltity to discriminate between the MSSM and LR extentions of the
SM. At the same time, MSSM and LR models are found to yield qualitatively the
same type of deviations from the SM in the forward-backward and the
longitudinal lepton polarization asymmetries.
|
[
{
"created": "Wed, 22 Jul 1998 14:15:49 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Melikhov",
"D.",
""
],
[
"Nikitin",
"N.",
""
],
[
"Simula",
"S.",
""
]
] |
We discuss a possibility to probe right-handed weak hadronic currents in rare semileptonic b -> s transitions. It is shown that within models involving right-handed as well as left-handed quark currents (LR models) one can expect a strong enhancement of the right-handed K* production in B -> K* l+ l- decays compared with models including only left-handed quark currents (SM, MSSM). Hence an experimental study of the transverse asymmetry of the produced K* mesons provides a clear test of the presence of the right-handed quark currents and a possibiltity to discriminate between the MSSM and LR extentions of the SM. At the same time, MSSM and LR models are found to yield qualitatively the same type of deviations from the SM in the forward-backward and the longitudinal lepton polarization asymmetries.
|
hep-ph/0306213
|
Weizhen Deng
|
Weizhen Deng, Yanrui Liu, Xiaolin Chen, Dahai Lu, Shilin Zhu
|
Chiral Symmetry in an Extended Constituent Quark Potential Model
| null |
Phys.Lett. B575 (2003) 55-65
|
10.1016/j.physletb.2003.09.035
| null |
hep-ph
| null |
The chiral symmetry is applied to an extended constituent quark potential
model. With random phase approximation (RPA), the model comprises sea quark
excitations. To obtain the pseudoscalar $\pi$ meson as a Goldstone boson, the
quark effective potentials are modified in the model to account for the
dynamical breaking of chiral symmetry. Also the vector $\rho$ meson is
calculated and the KSRF relation about $\pi$ and $\rho$ meson decay constants
is derived in the model.
|
[
{
"created": "Mon, 23 Jun 2003 14:02:27 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Aug 2003 03:38:54 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Sep 2003 07:29:57 GMT",
"version": "v3"
}
] |
2015-06-25
|
[
[
"Deng",
"Weizhen",
""
],
[
"Liu",
"Yanrui",
""
],
[
"Chen",
"Xiaolin",
""
],
[
"Lu",
"Dahai",
""
],
[
"Zhu",
"Shilin",
""
]
] |
The chiral symmetry is applied to an extended constituent quark potential model. With random phase approximation (RPA), the model comprises sea quark excitations. To obtain the pseudoscalar $\pi$ meson as a Goldstone boson, the quark effective potentials are modified in the model to account for the dynamical breaking of chiral symmetry. Also the vector $\rho$ meson is calculated and the KSRF relation about $\pi$ and $\rho$ meson decay constants is derived in the model.
|
1405.1355
|
Michael Strickland
|
Mohammad Nopoush, Radoslaw Ryblewski, Michael Strickland
|
Bulk viscous evolution within anisotropic hydrodynamics
|
34 pages, 5 figures; v2 - PRC version
|
Phys. Rev. C 90, 014908 (2014)
|
10.1103/PhysRevC.90.014908
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive a system of moment-based dynamical equations that describe the 1+1d
space-time evolution of a cylindrically symmetric massive gas undergoing
boost-invariant longitudinal expansion. Extending previous work, we introduce
an explicit degree of freedom associated with the bulk pressure of the system.
The resulting form generalizes the ellipsoidal one-particle distribution
function appropriate for massless particles to massive particles. Using this
generalized form, we obtain a system of partial differential equations that can
be solved numerically. In order to assess the performance of this scheme, we
compare the resulting anisotropic hydrodynamics solutions with the exact
solution of the 0+1d Boltzmann equation in the relaxation time approximation.
We find that the inclusion of the bulk degree of freedom improves agreement
between anisotropic hydrodynamics and the exact solution for a massive gas.
|
[
{
"created": "Tue, 6 May 2014 16:37:33 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jul 2014 19:57:28 GMT",
"version": "v2"
}
] |
2014-07-30
|
[
[
"Nopoush",
"Mohammad",
""
],
[
"Ryblewski",
"Radoslaw",
""
],
[
"Strickland",
"Michael",
""
]
] |
We derive a system of moment-based dynamical equations that describe the 1+1d space-time evolution of a cylindrically symmetric massive gas undergoing boost-invariant longitudinal expansion. Extending previous work, we introduce an explicit degree of freedom associated with the bulk pressure of the system. The resulting form generalizes the ellipsoidal one-particle distribution function appropriate for massless particles to massive particles. Using this generalized form, we obtain a system of partial differential equations that can be solved numerically. In order to assess the performance of this scheme, we compare the resulting anisotropic hydrodynamics solutions with the exact solution of the 0+1d Boltzmann equation in the relaxation time approximation. We find that the inclusion of the bulk degree of freedom improves agreement between anisotropic hydrodynamics and the exact solution for a massive gas.
|
2305.03746
|
Ivan Esteban
|
Toni Bert\'olez-Mart\'inez, Carlos A. Arg\"uelles, Ivan Esteban,
Jacobo Lopez-Pavon, Ivan Martinez-Soler, Jordi Salvado
|
IceCube and the origin of ANITA-IV events
|
11 pages, 7 figures + Appendices. Comments welcome! v2: Added
references and expanded the discussion on particle physics models. Matches
version accepted by JHEP
| null |
10.1007/JHEP07(2023)005
|
FTUV-23-0426.7835, IFIC/23-14
|
hep-ph astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the ANITA collaboration announced the detection of new, unsettling
upgoing Ultra-High-Energy (UHE) events. Understanding their origin is pressing
to ensure success of the incoming UHE neutrino program. In this work, we study
their internal consistency and the implications of the lack of similar events
in IceCube. We introduce a generic, simple parametrization to study the
compatibility between these two observatories in Standard Model-like and Beyond
Standard Model scenarios: an incoming flux of particles that interact with
Earth nucleons with cross section $\sigma$, producing particle showers along
with long-lived particles that decay with lifetime $\tau$ and generate a shower
that explains ANITA observations. We find that the ANITA angular distribution
imposes significant constraints, and when including null observations from
IceCube only $\tau \sim 10^{-3}$ - $10^{-2} \,\mathrm{s}$ and $\sigma \sim
10^{-33}$ - $10^{-32}\,\mathrm{cm^2}$ can explain the data. This hypothesis is
testable with future IceCube data. Finally, we discuss a specific model that
can realize this scenario. Our analysis highlights the importance of
simultaneous observations by high-energy optical neutrino telescopes and new
UHE radio detectors to uncover cosmogenic neutrinos or discover new physics.
|
[
{
"created": "Fri, 5 May 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2023 14:31:38 GMT",
"version": "v2"
}
] |
2023-08-07
|
[
[
"Bertólez-Martínez",
"Toni",
""
],
[
"Argüelles",
"Carlos A.",
""
],
[
"Esteban",
"Ivan",
""
],
[
"Lopez-Pavon",
"Jacobo",
""
],
[
"Martinez-Soler",
"Ivan",
""
],
[
"Salvado",
"Jordi",
""
]
] |
Recently, the ANITA collaboration announced the detection of new, unsettling upgoing Ultra-High-Energy (UHE) events. Understanding their origin is pressing to ensure success of the incoming UHE neutrino program. In this work, we study their internal consistency and the implications of the lack of similar events in IceCube. We introduce a generic, simple parametrization to study the compatibility between these two observatories in Standard Model-like and Beyond Standard Model scenarios: an incoming flux of particles that interact with Earth nucleons with cross section $\sigma$, producing particle showers along with long-lived particles that decay with lifetime $\tau$ and generate a shower that explains ANITA observations. We find that the ANITA angular distribution imposes significant constraints, and when including null observations from IceCube only $\tau \sim 10^{-3}$ - $10^{-2} \,\mathrm{s}$ and $\sigma \sim 10^{-33}$ - $10^{-32}\,\mathrm{cm^2}$ can explain the data. This hypothesis is testable with future IceCube data. Finally, we discuss a specific model that can realize this scenario. Our analysis highlights the importance of simultaneous observations by high-energy optical neutrino telescopes and new UHE radio detectors to uncover cosmogenic neutrinos or discover new physics.
|
hep-ph/0201174
|
Matthias Jamin
|
Matthias Jamin
|
Flavour-symmetry breaking of the quark condensate and chiral corrections
to the Gell-Mann-Oakes-Renner relation
|
12 pages, discussion of Psi(0) determinations corrected, refs. added
|
Phys.Lett. B538 (2002) 71-76
|
10.1016/S0370-2693(02)01951-2
|
HD-THEP-0201
|
hep-ph hep-lat nucl-th
| null |
The relation between the chiral quark condensate in QCD sum rules and chiral
perturbation theory is clarified with the help of a low-energy theorem for the
scalar and pseudoscalar correlation functions. It is found that the quark
condensate should be identified with the non-normal-ordered vacuum expectation
value of quark-antiquark fields. Utilising results on flavour SU(3) breaking of
the quark condensate from QCD sum rules, the unphysical low-energy constant
H_2^r in the chiral Lagrangian, as well as next-to-leading order corrections to
the Gell-Mann-Oakes-Renner relation are estimated.
|
[
{
"created": "Fri, 18 Jan 2002 16:16:55 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Feb 2002 17:12:43 GMT",
"version": "v2"
}
] |
2015-06-25
|
[
[
"Jamin",
"Matthias",
""
]
] |
The relation between the chiral quark condensate in QCD sum rules and chiral perturbation theory is clarified with the help of a low-energy theorem for the scalar and pseudoscalar correlation functions. It is found that the quark condensate should be identified with the non-normal-ordered vacuum expectation value of quark-antiquark fields. Utilising results on flavour SU(3) breaking of the quark condensate from QCD sum rules, the unphysical low-energy constant H_2^r in the chiral Lagrangian, as well as next-to-leading order corrections to the Gell-Mann-Oakes-Renner relation are estimated.
|
2008.01736
|
Lorenzo Zoppi
|
E. Laenen, J. Sinninghe Damst\'e, L. Vernazza, W. Waalewijn, L. Zoppi
|
Towards all-order factorization of QED amplitudes at next-to-leading
power
|
31 pages, 18 figures. v2: as in journal version
|
Phys. Rev. D 103, 034022 (2021)
|
10.1103/PhysRevD.103.034022
|
NIKHEF 2020-019
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We generalise the factorization of abelian gauge theory amplitudes to
next-to-leading power (NLP) in a soft scale expansion, following a recent
generalisation for Yukawa theory. From an all-order power counting analysis of
leading and next-to-leading regions, we infer the factorized structure for both
a parametrically small and zero fermion mass. This requires the introduction of
new universal jet functions, for non-radiative and single-radiative QED
amplitudes, which we compute at one-loop order. We show that our factorization
formula reproduces the relevant regions in one- and two-loop scattering
amplitudes, appropriately addressing endpoint divergences. It provides a
description of virtual collinear modes and accounts for non-trivial
hard-collinear interplay present beyond the one-loop level, making this a first
step towards a complete all-order factorization framework for gauge-theory
amplitudes at NLP.
|
[
{
"created": "Tue, 4 Aug 2020 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Feb 2021 13:17:30 GMT",
"version": "v2"
}
] |
2021-03-01
|
[
[
"Laenen",
"E.",
""
],
[
"Damsté",
"J. Sinninghe",
""
],
[
"Vernazza",
"L.",
""
],
[
"Waalewijn",
"W.",
""
],
[
"Zoppi",
"L.",
""
]
] |
We generalise the factorization of abelian gauge theory amplitudes to next-to-leading power (NLP) in a soft scale expansion, following a recent generalisation for Yukawa theory. From an all-order power counting analysis of leading and next-to-leading regions, we infer the factorized structure for both a parametrically small and zero fermion mass. This requires the introduction of new universal jet functions, for non-radiative and single-radiative QED amplitudes, which we compute at one-loop order. We show that our factorization formula reproduces the relevant regions in one- and two-loop scattering amplitudes, appropriately addressing endpoint divergences. It provides a description of virtual collinear modes and accounts for non-trivial hard-collinear interplay present beyond the one-loop level, making this a first step towards a complete all-order factorization framework for gauge-theory amplitudes at NLP.
|
hep-ph/0105087
|
Osamu Yasuda
|
John Pinney and Osamu Yasuda
|
Correlations of errors in measurements of CP violation at neutrino
factories
|
35 pages, 12 sets of figures, uses epsfig
|
Phys.Rev.D64:093008,2001
|
10.1103/PhysRevD.64.093008
| null |
hep-ph
| null |
Using $\Delta\chi^2$ which is defined by the difference of the number of
events with the CP phase $\delta$ and the hypothetical one with $\delta=0$, we
discuss correlations of errors of the CP phase and other oscillation parameters
as well as the matter effect in measurements at neutrino factories. By varying
the oscillation parameters and the normalization of the matter effect, we
evaluated the data size required to reject a hypothesis with $\delta=0$ at
3$\sigma$CL. The optimum muon energy and the baseline depends on the magnitude
of $\theta_{13}$, the background fraction, the uncertainty of the normalization
of the matter effect, but in general lie in the ranges 20GeV $\lesssim
E_\mu\lesssim$ 50GeV, 1000km$\lesssim L\lesssim$3000km. If we assume that the
uncertainty of the matter effect is as large as 20% then the optimum values may
be modified to $E_\mu\lesssim$ 10GeV, $L\lesssim$1000km due to the strong
correlation of $\delta$ and the matter effect. We show analytically that
sensitivity to CP violation is lost for $E_\mu\ll$ 10GeV or for $E_\mu\gg$
50GeV. We also discuss the possibility of measuring CP violation at the
upgraded JHF experiment by taking all the error correlations into account, and
show that it is possible to demonstrate $\delta\ne0$ at 3$\sigma$CL for
$\theta_{13}\gtrsim 3^\circ$.
|
[
{
"created": "Thu, 10 May 2001 07:47:25 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Pinney",
"John",
""
],
[
"Yasuda",
"Osamu",
""
]
] |
Using $\Delta\chi^2$ which is defined by the difference of the number of events with the CP phase $\delta$ and the hypothetical one with $\delta=0$, we discuss correlations of errors of the CP phase and other oscillation parameters as well as the matter effect in measurements at neutrino factories. By varying the oscillation parameters and the normalization of the matter effect, we evaluated the data size required to reject a hypothesis with $\delta=0$ at 3$\sigma$CL. The optimum muon energy and the baseline depends on the magnitude of $\theta_{13}$, the background fraction, the uncertainty of the normalization of the matter effect, but in general lie in the ranges 20GeV $\lesssim E_\mu\lesssim$ 50GeV, 1000km$\lesssim L\lesssim$3000km. If we assume that the uncertainty of the matter effect is as large as 20% then the optimum values may be modified to $E_\mu\lesssim$ 10GeV, $L\lesssim$1000km due to the strong correlation of $\delta$ and the matter effect. We show analytically that sensitivity to CP violation is lost for $E_\mu\ll$ 10GeV or for $E_\mu\gg$ 50GeV. We also discuss the possibility of measuring CP violation at the upgraded JHF experiment by taking all the error correlations into account, and show that it is possible to demonstrate $\delta\ne0$ at 3$\sigma$CL for $\theta_{13}\gtrsim 3^\circ$.
|
hep-ph/9405354
|
Park Gye Tai
|
Gye T. Park and T. K. Kuo
|
Inclusion of Z->b b-bar vertex corrections in Precision Electroweak
Tests on the Sp(6)_L X U(1)_Y Model
|
Latex, 16 pages+4 figures(not included but available as uuencoded or
PS files from gtpark@phya.snu.ac.kr), PURD-TH-94-08, SNUTP-94-46
|
Int.J.Mod.Phys. A10 (1995) 4387-4398
|
10.1142/S0217751X95002035
| null |
hep-ph
| null |
We extend our previous work on the precision electroweak tests in the Sp(6)_L
X U(1)_Y family model to include for the first time the important Z->b b-bar
vertex corrections encoded in a new variable epsilon_b, utilizing all the
latest LEP data. We include in our analysis the one loop EW radiative
corrections due to the new bosons in terms of epsilon_1, epsilon_b and
$\Delta\Gamma_Z$. We find that the correlation between epsilon_1 and epsilon_b
makes the combined constraint much stronger than the individual ones. The model
is consistent with the recent CDF result of $m_t=174\pm 10^{+13}_{-12}\GeV$,
but it can not accomodate $m_t\gsim 195\GeV$.
|
[
{
"created": "Mon, 23 May 1994 10:59:46 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Park",
"Gye T.",
""
],
[
"Kuo",
"T. K.",
""
]
] |
We extend our previous work on the precision electroweak tests in the Sp(6)_L X U(1)_Y family model to include for the first time the important Z->b b-bar vertex corrections encoded in a new variable epsilon_b, utilizing all the latest LEP data. We include in our analysis the one loop EW radiative corrections due to the new bosons in terms of epsilon_1, epsilon_b and $\Delta\Gamma_Z$. We find that the correlation between epsilon_1 and epsilon_b makes the combined constraint much stronger than the individual ones. The model is consistent with the recent CDF result of $m_t=174\pm 10^{+13}_{-12}\GeV$, but it can not accomodate $m_t\gsim 195\GeV$.
|
1704.08377
|
Edward K. G. Sarkisyan
|
Ranjit K. Nayak, Sadhana Dash (Indian Inst. Tech., Mumbai), Edward K.
Sarkisyan-Grinbaum (CERN & Texas U., Arlington), Marek Tasevsky (Prague,
Inst. Phys.)
|
Describing dynamical fluctuations and genuine correlations by Weibull
regularity
|
10 pages, 2 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Weibull parametrization of the multiplicity distribution is used to
describe the multidimensional local fluctuations and genuine multiparticle
correlations measured by OPAL in the large statistics $e^{+}e^{-} \to Z^{0} \to
hadrons$ sample. The data are found to be well reproduced by the Weibull model
up to higher orders. The Weibull predictions are compared to the predictions by
the two other models, namely by the negative binomial and modified negative
binomial distributions which mostly failed to fit the data. The Weibull
regularity, which is found to reproduce the multiplicity distributions along
with the genuine correlations, looks to be the optimal model to describe the
multiparticle production process.
|
[
{
"created": "Wed, 26 Apr 2017 23:10:29 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Apr 2017 06:29:40 GMT",
"version": "v2"
}
] |
2018-03-08
|
[
[
"Nayak",
"Ranjit K.",
"",
"Indian Inst. Tech., Mumbai"
],
[
"Dash",
"Sadhana",
"",
"Indian Inst. Tech., Mumbai"
],
[
"Sarkisyan-Grinbaum",
"Edward K.",
"",
"CERN & Texas U., Arlington"
],
[
"Tasevsky",
"Marek",
"",
"Prague,\n Inst. Phys."
]
] |
The Weibull parametrization of the multiplicity distribution is used to describe the multidimensional local fluctuations and genuine multiparticle correlations measured by OPAL in the large statistics $e^{+}e^{-} \to Z^{0} \to hadrons$ sample. The data are found to be well reproduced by the Weibull model up to higher orders. The Weibull predictions are compared to the predictions by the two other models, namely by the negative binomial and modified negative binomial distributions which mostly failed to fit the data. The Weibull regularity, which is found to reproduce the multiplicity distributions along with the genuine correlations, looks to be the optimal model to describe the multiparticle production process.
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.