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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0412108
|
Jitesh Bhatt
|
Jitesh Bhatt and Raghavan Rangarajan
|
Studying Electroweak Baryogenesis using Evenisation and the Wigner
Formalism
|
no figures (Error in indentification of antiparticle states
corrected.)
|
JHEP0503:057,2005
|
10.1088/1126-6708/2005/03/057
| null |
hep-ph
| null |
We derive the kinetic equation for fermions and antifermions interacting with
a planar Higgs bubble wall during the electroweak phase transition using the
`evenisation' procedure and the Wigner formalism for a Lagrangian with the
phase of the complex fermion mass rotated away. We obtain the energy, velocity
and force for the particles in the presence of the Higgs bubble wall. Our
results using both methods are in agreement. This indicates the robustness of
evenisation as a method to study quantum corrections to the velocity and force
for particles in the Higgs wall during the electroweak phase transition. We
also derive the transport equations from the zeroth and first moment of the
kinetic equation.
|
[
{
"created": "Wed, 8 Dec 2004 11:42:21 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Oct 2005 12:27:05 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bhatt",
"Jitesh",
""
],
[
"Rangarajan",
"Raghavan",
""
]
] |
We derive the kinetic equation for fermions and antifermions interacting with a planar Higgs bubble wall during the electroweak phase transition using the `evenisation' procedure and the Wigner formalism for a Lagrangian with the phase of the complex fermion mass rotated away. We obtain the energy, velocity and force for the particles in the presence of the Higgs bubble wall. Our results using both methods are in agreement. This indicates the robustness of evenisation as a method to study quantum corrections to the velocity and force for particles in the Higgs wall during the electroweak phase transition. We also derive the transport equations from the zeroth and first moment of the kinetic equation.
|
hep-ph/9908342
|
Lou Clavelli
|
L. Clavelli (Univ. of Alabama)
|
New Possibilities for a Light Gluino
|
13 pages, 1 eps figure, The scenario of a promptly decaying gluino is
not a viable option in the model considered and has been removed in this
revised version
| null | null | null |
hep-ph
| null |
Despite many positive indirect indications of light gluinos direct searches
for the expected signatures of gluino containing hadrons have so far turned up
negative severely restricting the allowable windows in gluino mass. After
briefly reviewing the status, we discuss a possible new decay scenario that
could have allowed light gluinos to evade direct detection with possible
consequences for other measurements.
|
[
{
"created": "Thu, 12 Aug 1999 22:40:34 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Oct 2000 01:04:09 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Clavelli",
"L.",
"",
"Univ. of Alabama"
]
] |
Despite many positive indirect indications of light gluinos direct searches for the expected signatures of gluino containing hadrons have so far turned up negative severely restricting the allowable windows in gluino mass. After briefly reviewing the status, we discuss a possible new decay scenario that could have allowed light gluinos to evade direct detection with possible consequences for other measurements.
|
1202.4038
|
Howard Baer
|
Howard Baer, Vernon Barger and Azar Mustafayev
|
Neutralino dark matter in mSUGRA/CMSSM with a 125 GeV light Higgs scalar
|
17 pages including 9 .eps figures
| null |
10.1007/JHEP05(2012)091
|
UMN--TH--3036/12, FTPI--MINN--12/09
|
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The minimal supergravity (mSUGRA or CMSSM) model is an oft-used framework for
exhibiting the properties of neutralino (WIMP) cold dark matter (CDM). However,
the recent evidence from Atlas and CMS on a light Higgs scalar with mass
m_h\simeq 125 GeV highly constrains the superparticle mass spectrum, which in
turn constrains the neutralino annihilation mechanisms in the early universe.
We find that stau and stop co-annihilation mechanisms -- already highly
stressed by the latest Atlas/CMS results on SUSY searches -- are nearly
eliminated if indeed the light Higgs scalar has mass m_h\simeq 125 GeV.
Furthermore, neutralino annihilation via the A-resonance is essentially ruled
out in mSUGRA so that it is exceedingly difficult to generate
thermally-produced neutralino-only dark matter at the measured abundance. The
remaining possibility lies in the focus-point region which now moves out to
m_0\sim 10-20 TeV range due to the required large trilinear soft SUSY breaking
term A_0. The remaining HB/FP region is more fine-tuned than before owing to
the typically large top squark masses. We present updated direct and indirect
detection rates for neutralino dark matter, and show that ton scale noble
liquid detectors will either discover mixed higgsino CDM or essentially rule
out thermally-produced neutralino-only CDM in the mSUGRA model.
|
[
{
"created": "Fri, 17 Feb 2012 23:22:20 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Mustafayev",
"Azar",
""
]
] |
The minimal supergravity (mSUGRA or CMSSM) model is an oft-used framework for exhibiting the properties of neutralino (WIMP) cold dark matter (CDM). However, the recent evidence from Atlas and CMS on a light Higgs scalar with mass m_h\simeq 125 GeV highly constrains the superparticle mass spectrum, which in turn constrains the neutralino annihilation mechanisms in the early universe. We find that stau and stop co-annihilation mechanisms -- already highly stressed by the latest Atlas/CMS results on SUSY searches -- are nearly eliminated if indeed the light Higgs scalar has mass m_h\simeq 125 GeV. Furthermore, neutralino annihilation via the A-resonance is essentially ruled out in mSUGRA so that it is exceedingly difficult to generate thermally-produced neutralino-only dark matter at the measured abundance. The remaining possibility lies in the focus-point region which now moves out to m_0\sim 10-20 TeV range due to the required large trilinear soft SUSY breaking term A_0. The remaining HB/FP region is more fine-tuned than before owing to the typically large top squark masses. We present updated direct and indirect detection rates for neutralino dark matter, and show that ton scale noble liquid detectors will either discover mixed higgsino CDM or essentially rule out thermally-produced neutralino-only CDM in the mSUGRA model.
|
1409.8425
|
Roman Ryutin Dr
|
V.A. Petrov and R.A. Ryutin
|
High-Energy Scattering vs Static QCD Strings
|
4 pages, 4 figures
|
Mod. Phys. Lett. A, Vol. 30, No. 18 (2015) 1550081
|
10.1142/S0217732315500819
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the shape of the interaction region of the elastically scattered
protons stipulated by the high-energy Pomeron exchange which turns out to be
very similar with the shape of the static string representing the confining QCD
flux tube. This similarity disappears when we enter the LHC energy region,
which corresponds to many-Pomeron exchanges. Reversing the argument we
conjecture a modified relationship between the width and the length of the
confining string at very large lengths.
|
[
{
"created": "Tue, 30 Sep 2014 08:23:55 GMT",
"version": "v1"
}
] |
2015-05-18
|
[
[
"Petrov",
"V. A.",
""
],
[
"Ryutin",
"R. A.",
""
]
] |
We discuss the shape of the interaction region of the elastically scattered protons stipulated by the high-energy Pomeron exchange which turns out to be very similar with the shape of the static string representing the confining QCD flux tube. This similarity disappears when we enter the LHC energy region, which corresponds to many-Pomeron exchanges. Reversing the argument we conjecture a modified relationship between the width and the length of the confining string at very large lengths.
|
2012.08607
|
Ritu Devi
|
Ritu Devi, Jaydip Singh and Baba Potukuchi
|
Uncertainties in QE and RES events at LBNF due to hadronic production in
FSI
| null |
Braz J Phys 52, 146 (2022)
|
10.1007/s13538-022-01144-1
| null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
To achieve appropriate interaction rates in recent neutrino oscillation
studies, high atomic number nuclear targets were utilized. Because of the
nuclear effects in the experimental observable, the utilization of these
complicated targets produced systematic uncertainties that needed to be
assessed accurately to constrain the discovery. We made an effort to calculate
the nuclear effects in the Ar and H targets, which are intended to be employed
at the DUNE distant and near detectors, respectively, through our simulation
effort. The DUNE flux is peaking around 2.5 GeV and CCRES is the dominant
process at this energy. So, this work will be focused only on the CCQE and
CCRES interactions and the simulations will be done using two different
neutrino event generators. We reported the ratio of the oscillation probability
(P(Ar)/P(H) as a function of reconstructed neutrino energy for CCRES channels
to quantify the systematic errors in the observables.
|
[
{
"created": "Tue, 24 Nov 2020 17:36:53 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2022 04:59:58 GMT",
"version": "v2"
}
] |
2022-06-22
|
[
[
"Devi",
"Ritu",
""
],
[
"Singh",
"Jaydip",
""
],
[
"Potukuchi",
"Baba",
""
]
] |
To achieve appropriate interaction rates in recent neutrino oscillation studies, high atomic number nuclear targets were utilized. Because of the nuclear effects in the experimental observable, the utilization of these complicated targets produced systematic uncertainties that needed to be assessed accurately to constrain the discovery. We made an effort to calculate the nuclear effects in the Ar and H targets, which are intended to be employed at the DUNE distant and near detectors, respectively, through our simulation effort. The DUNE flux is peaking around 2.5 GeV and CCRES is the dominant process at this energy. So, this work will be focused only on the CCQE and CCRES interactions and the simulations will be done using two different neutrino event generators. We reported the ratio of the oscillation probability (P(Ar)/P(H) as a function of reconstructed neutrino energy for CCRES channels to quantify the systematic errors in the observables.
|
hep-ph/0102323
|
Archil Kobakhidze
|
Archil B. Kobakhidze
|
Proton stability in TeV-scale GUTs
|
12 pages, typos corrected, references and comments added, accepted in
Phys. Lett. B
|
Phys.Lett. B514 (2001) 131-138
|
10.1016/S0370-2693(01)00776-6
|
HIP-2001-05/TH
|
hep-ph hep-th
| null |
We discuss the proton decay problem in theories with low gravity and/or GUT
scales. We pointed out that the gravity induced proton decay can be indeed
suppressed up to a desired level, while the GUT origin of the proton
instability is rather problematic. To solve this problem we suggest the GUT
model where the proton is stable in all orders of perturbation theory. This can
be simply achieved by the replication of quark-lepton families with ordinary
quarks and leptons residing in different GUT representations and by an
appropriate dimensional reduction. The model predicts extra mirror states which
along with the GUT particles and the excitations of extra dimensions could be
observable at high-energy colliders providing the unification scale is in the
TeV range.
|
[
{
"created": "Tue, 27 Feb 2001 21:07:28 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Mar 2001 11:54:28 GMT",
"version": "v2"
},
{
"created": "Mon, 7 May 2001 08:21:13 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Kobakhidze",
"Archil B.",
""
]
] |
We discuss the proton decay problem in theories with low gravity and/or GUT scales. We pointed out that the gravity induced proton decay can be indeed suppressed up to a desired level, while the GUT origin of the proton instability is rather problematic. To solve this problem we suggest the GUT model where the proton is stable in all orders of perturbation theory. This can be simply achieved by the replication of quark-lepton families with ordinary quarks and leptons residing in different GUT representations and by an appropriate dimensional reduction. The model predicts extra mirror states which along with the GUT particles and the excitations of extra dimensions could be observable at high-energy colliders providing the unification scale is in the TeV range.
|
hep-ph/9907345
|
Michael V. Chistyakov
|
M.V. Chistyakov, N.V. Mikheev
|
Radiative neutrino transition $\nu \to \nu \gamma$ in strongly
magnetized plasma
|
12 pages, 3 figure, LaTeX2e, uses epsf.sty, typos fixed, accepted to
Physics Letters B
|
Phys.Lett. B467 (1999) 232-237
|
10.1016/S0370-2693(99)01151-X
|
YARU-HE-99/05
|
hep-ph
| null |
The influence of strongly magnetized electron-positron plasma on the
radiative neutrino transition $\nng$ is investigated. The probability and mean
losses of the neutrino energy and momentum are calculated taking account of the
photon dispersion and large radiative corrections near the resonance. It is
shown that the combined effect of plasma and strong magnetic field decreases
the probability and mean values of the neutrino energy and momentum loss in
comparison with these values obtained in pure magnetic field.
|
[
{
"created": "Tue, 13 Jul 1999 22:10:47 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jan 2000 15:42:08 GMT",
"version": "v2"
},
{
"created": "Sat, 22 Jan 2000 14:52:36 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Chistyakov",
"M. V.",
""
],
[
"Mikheev",
"N. V.",
""
]
] |
The influence of strongly magnetized electron-positron plasma on the radiative neutrino transition $\nng$ is investigated. The probability and mean losses of the neutrino energy and momentum are calculated taking account of the photon dispersion and large radiative corrections near the resonance. It is shown that the combined effect of plasma and strong magnetic field decreases the probability and mean values of the neutrino energy and momentum loss in comparison with these values obtained in pure magnetic field.
|
hep-ph/9409346
|
Jean-Bruno Erismann
|
C. Bourrely, J. Soffer, Tai Tsun Wu
|
Expanding Protons seen by HERA
|
4 pages, CPT-94/P.3060,LaTex,2 fig available on cpt.univ-mrs.fr
directory pub/preprints/94/fundamental-interactions/94-P.3060
|
Phys.Lett. B339 (1994) 322-324
|
10.1016/0370-2693(94)90627-0
| null |
hep-ph
| null |
We show that the rising total photoproduction cross section recently observed
at HERA is entirely consistant with the impact-picture in the theory of
expanding protons which was proposed more than twenty years ago. More accurate
data, which is expected to be forthcoming soon, will give this prediction a
stringent test.
|
[
{
"created": "Mon, 19 Sep 1994 09:27:53 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Bourrely",
"C.",
""
],
[
"Soffer",
"J.",
""
],
[
"Wu",
"Tai Tsun",
""
]
] |
We show that the rising total photoproduction cross section recently observed at HERA is entirely consistant with the impact-picture in the theory of expanding protons which was proposed more than twenty years ago. More accurate data, which is expected to be forthcoming soon, will give this prediction a stringent test.
|
2308.00329
|
Raghunath Sahoo
|
Suraj Prasad, Neelkamal Mallick, and Raghunath Sahoo
|
Inclusive, prompt and non-prompt $\rm{J}/\psi$ identification in
proton-proton collisions at the Large Hadron Collider using machine learning
|
Same as the published version in Phys. Rev. D
|
Physical Review D 109, 014005 (2024)
|
10.1103/PhysRevD.109.014005
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://creativecommons.org/licenses/by-sa/4.0/
|
Studies related to $\rm{J}/\psi$ meson, a bound state of charm and anti-charm
quarks ($c\bar{c}$), in heavy-ion collisions, provide genuine testing grounds
for the theory of strong interaction, quantum chromodynamics (QCD). To better
understand the underlying production mechanism, cold nuclear matter effects,
and influence from the quark-gluon plasma, baseline measurements are also
performed in proton-proton ($pp$) and proton-nucleus ($p$--A) collisions. The
inclusive $\rm{J}/\psi$ measurement has contributions from both prompt and
non-prompt productions. The prompt $\rm{J}/\psi$ is produced directly from the
hadronic interactions or via feed-down from directly produced higher charmonium
states, whereas non-prompt $\rm{J}/\psi$ comes from the decay of beauty
hadrons. In experiments, $\rm{J}/\psi$ is reconstructed through its
electromagnetic decays to lepton pairs, in either $e^{+}+e^{-}$ or
$\mu^{+}+\mu^{-}$ decay channels. In this work, for the first time, machine
learning techniques are implemented to separate the prompt and non-prompt
dimuon pairs from the background to obtain a better identification of the
$\rm{J}/\psi$ signal for different production modes. The study has been
performed in $pp$ collisions at $\sqrt{s} = 7$ and 13 TeV simulated using
PYTHIA8. Machine learning models such as XGBoost and LightGBM are explored. The
models could achieve up to 99\% prediction accuracy. The transverse momentum
($p_{\rm T}$) and rapidity ($y$) differential measurements of inclusive,
prompt, and non-prompt $\rm{J}/\psi$, its multiplicity dependence, and the
$p_{\rm T}$ dependence of fraction of non-prompt $\rm{J}/\psi$ ($f_{\rm B}$)
are shown. These results are compared to experimental findings wherever
possible.
|
[
{
"created": "Tue, 1 Aug 2023 07:08:17 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 2024 10:41:43 GMT",
"version": "v2"
}
] |
2024-01-15
|
[
[
"Prasad",
"Suraj",
""
],
[
"Mallick",
"Neelkamal",
""
],
[
"Sahoo",
"Raghunath",
""
]
] |
Studies related to $\rm{J}/\psi$ meson, a bound state of charm and anti-charm quarks ($c\bar{c}$), in heavy-ion collisions, provide genuine testing grounds for the theory of strong interaction, quantum chromodynamics (QCD). To better understand the underlying production mechanism, cold nuclear matter effects, and influence from the quark-gluon plasma, baseline measurements are also performed in proton-proton ($pp$) and proton-nucleus ($p$--A) collisions. The inclusive $\rm{J}/\psi$ measurement has contributions from both prompt and non-prompt productions. The prompt $\rm{J}/\psi$ is produced directly from the hadronic interactions or via feed-down from directly produced higher charmonium states, whereas non-prompt $\rm{J}/\psi$ comes from the decay of beauty hadrons. In experiments, $\rm{J}/\psi$ is reconstructed through its electromagnetic decays to lepton pairs, in either $e^{+}+e^{-}$ or $\mu^{+}+\mu^{-}$ decay channels. In this work, for the first time, machine learning techniques are implemented to separate the prompt and non-prompt dimuon pairs from the background to obtain a better identification of the $\rm{J}/\psi$ signal for different production modes. The study has been performed in $pp$ collisions at $\sqrt{s} = 7$ and 13 TeV simulated using PYTHIA8. Machine learning models such as XGBoost and LightGBM are explored. The models could achieve up to 99\% prediction accuracy. The transverse momentum ($p_{\rm T}$) and rapidity ($y$) differential measurements of inclusive, prompt, and non-prompt $\rm{J}/\psi$, its multiplicity dependence, and the $p_{\rm T}$ dependence of fraction of non-prompt $\rm{J}/\psi$ ($f_{\rm B}$) are shown. These results are compared to experimental findings wherever possible.
|
hep-ph/9811205
|
Serguey Petcov
|
S. T. Petcov
|
The Oscillation Length Resonance in the Transitions of Solar and
Atmospheric Neutrinos Crossing the Earth Core
|
9 pages, two eps-files, era.sty and new.sty files; the text includes
2 figures. Talk given at the Satellite Symposium ``New Era in Neutrino
Physics'', June 11 - 12, 1998, Tokyo Metropolitan University, Tokyo, Japan;
version to be published in the Proceedings of the Symposium: results are
unchanged, approximate expression for the energy width of the neutrino
oscillation length resonance, one reference and a comment are added
| null | null |
SISSA 111/98/EP, October 1998
|
hep-ph astro-ph
| null |
The characteristic features of the neutrino oscillation length resonance,
taking place in the $\nu_2 \to \nu_{e}$ and $\nu_{\mu} \to \nu_{e}$ ($\nu_e \to
\nu_{\mu (\tau)}$) transitions in the Earth of the solar and atmospheric
neutrinos crossing the Earth core, are reviewed. The resonance enhances
dramatically these transitions at small mixing angles but differs from the MSW
one. It can be responsible, e.g., for the small excess of e-like events at
Zenith angles $\theta_{z} \sim (130^{\circ} - 180^{\circ})$ and can produce at
least part of the Zenith angle dependence of the rate of $\mu-$like events,
exhibited by the Super-Kamiokande atmospheric neutrino data.
|
[
{
"created": "Sat, 31 Oct 1998 16:55:50 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Nov 1998 14:53:16 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Petcov",
"S. T.",
""
]
] |
The characteristic features of the neutrino oscillation length resonance, taking place in the $\nu_2 \to \nu_{e}$ and $\nu_{\mu} \to \nu_{e}$ ($\nu_e \to \nu_{\mu (\tau)}$) transitions in the Earth of the solar and atmospheric neutrinos crossing the Earth core, are reviewed. The resonance enhances dramatically these transitions at small mixing angles but differs from the MSW one. It can be responsible, e.g., for the small excess of e-like events at Zenith angles $\theta_{z} \sim (130^{\circ} - 180^{\circ})$ and can produce at least part of the Zenith angle dependence of the rate of $\mu-$like events, exhibited by the Super-Kamiokande atmospheric neutrino data.
|
1612.00700
|
Andrey Kovtun
|
A.V. Kovtun and E.Ya. Nugaev
|
Radiative corrections and instability of large Q-Balls
|
17 pages, 10 figures, referneces added, minor changes in the text
|
Mod. Phys. Lett. A, Vol. 32, No. 37 (2017) 1750198
|
10.1142/S021773231750198X
|
INR-TH-2016-045
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss stability of Q-balls interacting with fermions in theory with
small coupling constant g. We argue that for configurations with large global
U(1)-charge Q the problem of classical stability becomes more subtle. For
example, in model with flat direction there is maximal value of charge for
stable solutions with Q~1/g^4. We study origin of additional instability and
discuss possible ways to avoid it.
|
[
{
"created": "Fri, 2 Dec 2016 15:12:27 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2017 09:57:57 GMT",
"version": "v2"
}
] |
2017-11-23
|
[
[
"Kovtun",
"A. V.",
""
],
[
"Nugaev",
"E. Ya.",
""
]
] |
We discuss stability of Q-balls interacting with fermions in theory with small coupling constant g. We argue that for configurations with large global U(1)-charge Q the problem of classical stability becomes more subtle. For example, in model with flat direction there is maximal value of charge for stable solutions with Q~1/g^4. We study origin of additional instability and discuss possible ways to avoid it.
|
hep-ph/9602238
|
J. Gunion
|
J.F. Gunion (U.C. Davis), A. Stange (BNL) and S. Willenbrock (U. Ill.,
Urbana)
|
Weakly-Coupled Higgs Bosons
|
130 pages, tex file and figures (some bitmapped), full postscript
file, including full resolution figures, is available via anonymous ftp at
ftp://ucdhep.ucdavis.edu/gunion/lighthiggs.ps (5.4MB)
| null | null |
UCD-95-28
|
hep-ph hep-ex
| null |
We review the search for the standard Higgs boson, the Higgs bosons of the
supersymmetric standard model, and Higgs bosons from a variety of other models
at present and future colliders.
|
[
{
"created": "Tue, 6 Feb 1996 20:39:13 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gunion",
"J. F.",
"",
"U.C. Davis"
],
[
"Stange",
"A.",
"",
"BNL"
],
[
"Willenbrock",
"S.",
"",
"U. Ill.,\n Urbana"
]
] |
We review the search for the standard Higgs boson, the Higgs bosons of the supersymmetric standard model, and Higgs bosons from a variety of other models at present and future colliders.
|
1902.02105
|
Zolt\'an Nagy
|
Zoltan Nagy and Davison E. Soper
|
Parton showers with more exact color evolution
|
27 pages, 19 figures
|
Phys. Rev. D 99, 054009 (2019)
|
10.1103/PhysRevD.99.054009
|
DESY 19-013
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Parton shower event generators typically approximate evolution of QCD color
so that only contributions that are leading in the limit of an infinite number
of colors are retained. Our parton shower generator, Deductor, has used an
"LC+" approximation that is better, but still quite limited. In this paper, we
introduce a new scheme for color in which the approximations can be
systematically improved. That is, one can choose the theoretical accuracy
level, but the accuracy level that is practical is limited by the computer
resources available.
|
[
{
"created": "Wed, 6 Feb 2019 10:46:50 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Mar 2019 11:28:57 GMT",
"version": "v2"
}
] |
2019-03-27
|
[
[
"Nagy",
"Zoltan",
""
],
[
"Soper",
"Davison E.",
""
]
] |
Parton shower event generators typically approximate evolution of QCD color so that only contributions that are leading in the limit of an infinite number of colors are retained. Our parton shower generator, Deductor, has used an "LC+" approximation that is better, but still quite limited. In this paper, we introduce a new scheme for color in which the approximations can be systematically improved. That is, one can choose the theoretical accuracy level, but the accuracy level that is practical is limited by the computer resources available.
|
1809.01834
|
Renata Jora
|
Renata Jora
|
Confinement and chiral phase transitions in QCD and superQCD
|
7 pages, 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study confinement and chiral symmetry breaking phase transitions for QCD
and supersymmetric QCD. The method is based on some justified assumption
regarding the behavior of the Green function relevant for the potential between
two charges or a gap equation. We determine the number of flavors at which the
transitions to confinement and chiral symmetry breaking take place. We find
that whereas for chiral symmetry breaking the results are in perfect agreement
with those in the literature for confinement the situation is more complex.
|
[
{
"created": "Thu, 6 Sep 2018 05:49:59 GMT",
"version": "v1"
}
] |
2018-09-07
|
[
[
"Jora",
"Renata",
""
]
] |
We study confinement and chiral symmetry breaking phase transitions for QCD and supersymmetric QCD. The method is based on some justified assumption regarding the behavior of the Green function relevant for the potential between two charges or a gap equation. We determine the number of flavors at which the transitions to confinement and chiral symmetry breaking take place. We find that whereas for chiral symmetry breaking the results are in perfect agreement with those in the literature for confinement the situation is more complex.
|
2312.04274
|
Clemens Werthmann
|
Clemens Werthmann, Victor E. Ambru\c{s} and S\"oren Schlichting
|
Establishing the Range of Applicability of Hydrodynamics in High-Energy
Collisions
|
4 pages, 2 figures. Contribution to the Quark Matter 2023 conference
proceedings. v2: Minor changes. Identical to accepted version
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We simulate the space-time dynamics of high-energy collisions based on a
microscopic kinetic description, in order to determine the range of
applicability of an effective description in relativistic viscous
hydrodynamics. We find that hydrodynamics provides a quantitatively accurate
description of collective flow when the average inverse Reynolds number is
sufficiently small and the early pre-equilibrium stage is properly accounted
for. By determining the breakdown of hydrodynamics as a function of system size
and energy, we find that it is quantitatively accurate in central lead-lead
collisions at LHC energies, but should not be used in typical proton-lead or
proton-proton collisions, where the development of collective flow cannot
accurately be described within hydrodynamics.
|
[
{
"created": "Thu, 7 Dec 2023 12:53:57 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2024 11:01:49 GMT",
"version": "v2"
}
] |
2024-02-12
|
[
[
"Werthmann",
"Clemens",
""
],
[
"Ambruş",
"Victor E.",
""
],
[
"Schlichting",
"Sören",
""
]
] |
We simulate the space-time dynamics of high-energy collisions based on a microscopic kinetic description, in order to determine the range of applicability of an effective description in relativistic viscous hydrodynamics. We find that hydrodynamics provides a quantitatively accurate description of collective flow when the average inverse Reynolds number is sufficiently small and the early pre-equilibrium stage is properly accounted for. By determining the breakdown of hydrodynamics as a function of system size and energy, we find that it is quantitatively accurate in central lead-lead collisions at LHC energies, but should not be used in typical proton-lead or proton-proton collisions, where the development of collective flow cannot accurately be described within hydrodynamics.
|
hep-ph/0210099
|
Skokov Vladimir
|
V.V. Skokov, S.A. Smolyansky, and V.D. Toneev
|
Quark-gluon evolution in early stage of ultra-relativistic heavy-ion
collisions
|
6 pages, 4 figures, presented at XVI International Baldin Seminar On
High Energy Physics Problems
| null | null | null |
hep-ph
| null |
A set of coupled kinetic equations describing in the Abelian approximation a
mixture of quarks and self-interacting gluons is formulated and solved
numerically. The model includes the Schwinger-like mechanism for particle
creation in a strong field as well as two-particle elastic collisions between
all mixture components in the Landau approximation of small-angle scattering.
The process of equilibration at the initial energy density exhibits a dominant
quark creation in the very early time of interaction. It is shown that damping
of energy density oscillations due to elastic scattering of perturbative quarks
and gluons is not strong enough to reach thermodynamic equilibrium in a
reasonable relaxation time. A possible account for a such behavior is
discussed.
|
[
{
"created": "Mon, 7 Oct 2002 10:43:47 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Skokov",
"V. V.",
""
],
[
"Smolyansky",
"S. A.",
""
],
[
"Toneev",
"V. D.",
""
]
] |
A set of coupled kinetic equations describing in the Abelian approximation a mixture of quarks and self-interacting gluons is formulated and solved numerically. The model includes the Schwinger-like mechanism for particle creation in a strong field as well as two-particle elastic collisions between all mixture components in the Landau approximation of small-angle scattering. The process of equilibration at the initial energy density exhibits a dominant quark creation in the very early time of interaction. It is shown that damping of energy density oscillations due to elastic scattering of perturbative quarks and gluons is not strong enough to reach thermodynamic equilibrium in a reasonable relaxation time. A possible account for a such behavior is discussed.
|
hep-ph/0407343
|
Nigel Glover
|
T.G. Birthwright, E.W.N. Glover and P. Marquard (Durham, IPPP)
|
Master Integrals For Massless Two-Loop Vertex Diagrams With Three
Offshell Legs
|
33 pages, JHEP3.cls, figures produced by feynmf, analytic results in
data.m, reference added
|
JHEP0409:042,2004
|
10.1088/1126-6708/2004/09/042
|
DCPT/04/90, IPPP/04/45
|
hep-ph
| null |
We compute the master integrals for massless two-loop vertex graphs with
three off-shell legs. These master integrals are relevant for the QCD
corrections to H to V*V* (where V = W, Z) and for two-loop studies of the
triple gluon (and quark-gluon) vertex. We employ the differential equation
technique to provide series expansions in epsilon for the various master
integrals. The results are analytic and contain a new class of two-dimensional
harmonic polylogarithms.
|
[
{
"created": "Thu, 29 Jul 2004 14:30:22 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Aug 2004 17:47:37 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Birthwright",
"T. G.",
"",
"Durham, IPPP"
],
[
"Glover",
"E. W. N.",
"",
"Durham, IPPP"
],
[
"Marquard",
"P.",
"",
"Durham, IPPP"
]
] |
We compute the master integrals for massless two-loop vertex graphs with three off-shell legs. These master integrals are relevant for the QCD corrections to H to V*V* (where V = W, Z) and for two-loop studies of the triple gluon (and quark-gluon) vertex. We employ the differential equation technique to provide series expansions in epsilon for the various master integrals. The results are analytic and contain a new class of two-dimensional harmonic polylogarithms.
|
hep-ph/9403257
| null |
Patrick Huet and Michael E. Peskin
|
Violation of CPT and Quantum Mechanics in the K0--K0bar System
|
50 pages, uses PHYZZX, one figure available on request. This revised
version contains minor corrections, improved bounds on the parameters which
measure violation of quantum mechanics, and a more complete set of formulae
|
Nucl.Phys.B434:3-38,1995
|
10.1016/0550-3213(94)00390-Z
|
SLAC-PUB-6454
|
hep-ph
| null |
We reconsider the model of quantum mechanics violation in the $\ko$--$\kob$
system, due to Ellis, Hagelin, Nanopoulos, and Srednicki, in which \cp- and
\cpt-violating signatures arise from the evolution of pure states into mixed
states. We present a formalism for computing time-dependent asymmetries in this
model and show that present data constrains its parameters significantly. In
the future, this model will be put to very stringent tests at a $\phi$ factory.
We present the theory of these tests and show the relation between particular
$\phi$ decay correlations and the parameters of quantum mechanics violation.
|
[
{
"created": "Wed, 9 Mar 1994 20:14:00 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Aug 1994 00:01:00 GMT",
"version": "v2"
}
] |
2010-11-01
|
[
[
"Huet",
"Patrick",
""
],
[
"Peskin",
"Michael E.",
""
]
] |
We reconsider the model of quantum mechanics violation in the $\ko$--$\kob$ system, due to Ellis, Hagelin, Nanopoulos, and Srednicki, in which \cp- and \cpt-violating signatures arise from the evolution of pure states into mixed states. We present a formalism for computing time-dependent asymmetries in this model and show that present data constrains its parameters significantly. In the future, this model will be put to very stringent tests at a $\phi$ factory. We present the theory of these tests and show the relation between particular $\phi$ decay correlations and the parameters of quantum mechanics violation.
|
hep-ph/0111425
|
Ismd31
|
Bo Andersson
|
Closing talk for the XXXI International Symposium on Multiparticle
Dynamics (ISMD)
|
17 pages, talk given at XXXI International Symposium on Multiparticle
Dynamics, Sept 1-7, 2001, Datong China. URL http://ismd31.ccnu.edu.cn/
| null | null | null |
hep-ph
| null |
I will use this opportunity on the one hand to comment upon some of the many
interesting results that have been presented at this meeting, on the other hand
to discuss some new features that we have recently learned on the structure and
properties of the Lund Model both with respect to the fragmentation of
multigluon string states and the partonic cascades based upon perturbative QCD.
|
[
{
"created": "Thu, 29 Nov 2001 14:13:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Andersson",
"Bo",
""
]
] |
I will use this opportunity on the one hand to comment upon some of the many interesting results that have been presented at this meeting, on the other hand to discuss some new features that we have recently learned on the structure and properties of the Lund Model both with respect to the fragmentation of multigluon string states and the partonic cascades based upon perturbative QCD.
|
hep-ph/9505361
| null |
Wei Lu
|
Novel Structure Function for Photon Fragmentation into a $\Lambda$
Hyperon and Transverse $\Lambda$ Polarization in Unpolarized
Electron-Positron Annihilation
|
RevTex, 4 pages, the version appearing in Phys. Rev. D
|
Phys.Rev. D51 (1995) 5305-5308
|
10.1103/PhysRevD.51.5305
| null |
hep-ph
| null |
The possibility is examined for the inclusive $\Lambda$ in unpolarized
electron-positron annihilation to be transversely polarized. Due to final-state
interactions, there exists a novel structure function $\hat F(z,Q^2)$ for the
inclusive $\Lambda$ hyperon (or any other baryons) production from the
unpolarized time-like photon fragmentation, which makes contribution to the
transverse $\Lambda$ polarization in the unpolarized electron-positron
annihilation.
|
[
{
"created": "Tue, 23 May 1995 22:12:00 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 1995 00:49:03 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Nov 1995 21:38:27 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Lu",
"Wei",
""
]
] |
The possibility is examined for the inclusive $\Lambda$ in unpolarized electron-positron annihilation to be transversely polarized. Due to final-state interactions, there exists a novel structure function $\hat F(z,Q^2)$ for the inclusive $\Lambda$ hyperon (or any other baryons) production from the unpolarized time-like photon fragmentation, which makes contribution to the transverse $\Lambda$ polarization in the unpolarized electron-positron annihilation.
|
0807.1522
|
Pavel Bolokhov
|
Pavel A. Bolokhov and Maxim Pospelov
|
Low-energy constraints on kappa-Minkowski extension of the Standard
Model
|
6 pages
|
Phys.Lett.B677:160-163,2009
|
10.1016/j.physletb.2009.04.086
| null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the phenomenological consequences of kappa-Minkowski extension
of the Standard Model, working in the linear order in inverse $\kappa$. At this
order the *-deformed Lagrangian can be expanded in the series of dimension five
operators that have non-trivial transformation properties under the ordinary
Lorentz invariance. Such operators cause the Lorentz-violating signatures at
low energies, and in particular lead to the anomalous spin precession linked to
the external direction. The experimental bounds on this phenomenon then
restrict parameter $\kappa$ to be above 10^{23} GeV, making it difficult to
impose a direct connection between this theory and quantum gravity.
|
[
{
"created": "Wed, 9 Jul 2008 19:24:19 GMT",
"version": "v1"
}
] |
2009-06-19
|
[
[
"Bolokhov",
"Pavel A.",
""
],
[
"Pospelov",
"Maxim",
""
]
] |
We investigate the phenomenological consequences of kappa-Minkowski extension of the Standard Model, working in the linear order in inverse $\kappa$. At this order the *-deformed Lagrangian can be expanded in the series of dimension five operators that have non-trivial transformation properties under the ordinary Lorentz invariance. Such operators cause the Lorentz-violating signatures at low energies, and in particular lead to the anomalous spin precession linked to the external direction. The experimental bounds on this phenomenon then restrict parameter $\kappa$ to be above 10^{23} GeV, making it difficult to impose a direct connection between this theory and quantum gravity.
|
2003.12077
|
Tongyan Lin
|
Jonathan Kozaczuk, Tongyan Lin
|
Plasmon production from dark matter scattering
|
10 pages; journal version
|
Phys. Rev. D 101, 123012 (2020)
|
10.1103/PhysRevD.101.123012
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a first calculation of the rate for plasmon production in
semiconductors from nuclei recoiling against dark matter. The process is
analogous to bremsstrahlung of transverse photon modes, but with a longitudinal
plasmon mode emitted instead. For dark matter in the 10 MeV - 1 GeV mass range,
we find that the plasmon bremsstrahlung rate is 4-5 orders of magnitude smaller
than that for elastic scattering, but 4-5 orders of magnitude larger than the
transverse bremsstrahlung rate. Because the plasmon can decay into electronic
excitations and has characteristic energy given by the plasma frequency
$\omega_p$, with $\omega_p \approx 16$ eV in Si crystals, plasmon production
provides a distinctive signature and new method to detect nuclear recoils from
sub-GeV dark matter.
|
[
{
"created": "Thu, 26 Mar 2020 18:00:12 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jun 2020 23:11:12 GMT",
"version": "v2"
}
] |
2020-07-01
|
[
[
"Kozaczuk",
"Jonathan",
""
],
[
"Lin",
"Tongyan",
""
]
] |
We present a first calculation of the rate for plasmon production in semiconductors from nuclei recoiling against dark matter. The process is analogous to bremsstrahlung of transverse photon modes, but with a longitudinal plasmon mode emitted instead. For dark matter in the 10 MeV - 1 GeV mass range, we find that the plasmon bremsstrahlung rate is 4-5 orders of magnitude smaller than that for elastic scattering, but 4-5 orders of magnitude larger than the transverse bremsstrahlung rate. Because the plasmon can decay into electronic excitations and has characteristic energy given by the plasma frequency $\omega_p$, with $\omega_p \approx 16$ eV in Si crystals, plasmon production provides a distinctive signature and new method to detect nuclear recoils from sub-GeV dark matter.
|
hep-ph/9304266
|
Enrico Nardi
|
Enrico Nardi
|
Unconventional superstring derived E$_{\bf 6}$ models and neutrino
phenomenology
|
Plain Tex, 33 pages, 3 PostScript figures (uses epsf.tex). Modified
file-format. No changes in the text
|
Phys.Rev. D48 (1993) 3277-3287
|
10.1103/PhysRevD.48.3277
|
UM-TH 93--09
|
hep-ph
| null |
Conventional superstring derived E$_6$ models can accommodate small neutrino
masses if a discrete symmetry is imposed which forbids tree level Dirac
neutrino masses but allows for radiative mass generation. Since the only
possible symmetries of this kind are known to be generation dependent, we
explore the possibility that the three sets of light states in each generation
do not have the same assignments with respect to the 27 of $E_6$, leading to
non universal gauge interactions under the additional $U(1)'$ factors for the
known fermions. We argue that models realising such a scenario are viable, with
their structure being constrained mainly by the requirement of the absence of
flavor changing neutral currents in the Higgs sector. Moreover, in contrast to
the standard case, rank 6 models are not disfavoured with respect to rank 5. By
requiring the number of light neutral states to be minimal, these models have
an almost unique pattern of neutrino masses and mixings. We construct a model
based on the unconventional assignment scenario in which (with a natural choice
of the parameters) $m_{\nut}\sim O(10)$eV is generated at one loop, $m_{\num}$
is generated at two loops and lies in a range interesting for the solar
neutrino problem, and $\nue$ remains massless. In addition, since baryon and
lepton number are conserved, there is no proton decay in the model. To
illustrate the non-standard phenomenology implied by our scheme we also discuss
a second scenario in which an attempt for solving the solar neutrino puzzle
with matter enhanced oscillations and practically massless neutrinos can be
formulated, and in which peculiar effects for the $\num$ --> $\nut$ conversion
of the upward-going atmospheric neutrinos could arise as well.
|
[
{
"created": "Sun, 18 Apr 1993 23:09:25 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Sep 1993 00:40:28 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Nov 1998 16:24:20 GMT",
"version": "v3"
}
] |
2009-10-22
|
[
[
"Nardi",
"Enrico",
""
]
] |
Conventional superstring derived E$_6$ models can accommodate small neutrino masses if a discrete symmetry is imposed which forbids tree level Dirac neutrino masses but allows for radiative mass generation. Since the only possible symmetries of this kind are known to be generation dependent, we explore the possibility that the three sets of light states in each generation do not have the same assignments with respect to the 27 of $E_6$, leading to non universal gauge interactions under the additional $U(1)'$ factors for the known fermions. We argue that models realising such a scenario are viable, with their structure being constrained mainly by the requirement of the absence of flavor changing neutral currents in the Higgs sector. Moreover, in contrast to the standard case, rank 6 models are not disfavoured with respect to rank 5. By requiring the number of light neutral states to be minimal, these models have an almost unique pattern of neutrino masses and mixings. We construct a model based on the unconventional assignment scenario in which (with a natural choice of the parameters) $m_{\nut}\sim O(10)$eV is generated at one loop, $m_{\num}$ is generated at two loops and lies in a range interesting for the solar neutrino problem, and $\nue$ remains massless. In addition, since baryon and lepton number are conserved, there is no proton decay in the model. To illustrate the non-standard phenomenology implied by our scheme we also discuss a second scenario in which an attempt for solving the solar neutrino puzzle with matter enhanced oscillations and practically massless neutrinos can be formulated, and in which peculiar effects for the $\num$ --> $\nut$ conversion of the upward-going atmospheric neutrinos could arise as well.
|
2312.04482
|
Wen-Yuan Ai
|
Wen-Yuan Ai, Jean Alexandre and Sarben Sarkar
|
False vacuum decay rates, more precisely
|
35 pages, 5 figures; v2: presentation improved, refs updated; v3: a
typo in Eq. (27) corrected, matches the published version
|
Phys. Rev. D 109, 045010 (2024)
|
10.1103/PhysRevD.109.045010
|
KCL-PH-TH/2023-07
|
hep-ph astro-ph.CO hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We develop a method for accurately calculating vacuum decay rates beyond the
thin-wall regime in a pure scalar field theory at the one-loop level of the
effective action. It accounts for radiative effects resulting from quantum
corrections to the classical bounce, including gradient effects stemming from
the inhomogeneity of the bounce background. To achieve this, it is necessary to
compute not only the functional determinant of the fluctuation operator in the
background of the classical bounce but also its functional derivative evaluated
at the classical bounce. The former is efficiently calculated using the
Gel'fand-Yaglom method. We illustrate how the latter can also be calculated
with the same method, combined with a computation of various Green's functions.
|
[
{
"created": "Thu, 7 Dec 2023 17:57:46 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jan 2024 20:36:01 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Feb 2024 15:49:29 GMT",
"version": "v3"
}
] |
2024-02-22
|
[
[
"Ai",
"Wen-Yuan",
""
],
[
"Alexandre",
"Jean",
""
],
[
"Sarkar",
"Sarben",
""
]
] |
We develop a method for accurately calculating vacuum decay rates beyond the thin-wall regime in a pure scalar field theory at the one-loop level of the effective action. It accounts for radiative effects resulting from quantum corrections to the classical bounce, including gradient effects stemming from the inhomogeneity of the bounce background. To achieve this, it is necessary to compute not only the functional determinant of the fluctuation operator in the background of the classical bounce but also its functional derivative evaluated at the classical bounce. The former is efficiently calculated using the Gel'fand-Yaglom method. We illustrate how the latter can also be calculated with the same method, combined with a computation of various Green's functions.
|
1002.1518
|
Alfredo Vega Dr.
|
Alfredo Vega, Ivan Schmidt, Tanja Branz, Thomas Gutsche and Valery E.
Lyubovitskij
|
Meson wave function from holographic approaches
|
4 pages, 3 figures, to appear in the Proceedings of the VIII Latin
American Symposium on Nuclear Physics and Applications, Santiago, Chile,
15-19 December 2009. Talk presented by A. V
|
AIP Conf.Proc.1265:260-263,2010
|
10.1063/1.3480179
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the light-front wave function for the valence quark state of
mesons using the AdS/CFT correspondence. We consider two kinds of wave
functions obtained in different holographic Soft-Wall approaches
|
[
{
"created": "Mon, 8 Feb 2010 03:24:53 GMT",
"version": "v1"
}
] |
2015-05-18
|
[
[
"Vega",
"Alfredo",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Branz",
"Tanja",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] |
We discuss the light-front wave function for the valence quark state of mesons using the AdS/CFT correspondence. We consider two kinds of wave functions obtained in different holographic Soft-Wall approaches
|
0807.1508
|
Daniel Phalen
|
Phill Grajek, Gordon Kane, Daniel J. Phalen, Aaron Pierce, and Scott
Watson
|
Neutralino Dark Matter from Indirect Detection Revisited
|
23 pages, 9 figures: v2. Corrected typos, fixed synchrotron bounds in
light of bugs in program
| null | null |
MCTP-08-54
|
hep-ph astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit indirect detection possibilities for neutralino dark matter,
emphasizing the complementary roles of different approaches. While thermally
produced dark matter often requires large astrophysical "boost factors" to
observe antimatter signals, the physically motivated alternative of non-thermal
dark matter can naturally provide interesting signals, for example from light
wino or Higgsino dark matter. After a brief review of cosmic ray propagation,
we discuss signals for positrons, antiprotons, synchrotron radiation and gamma
rays from wino annihilation in the galactic halo, and examine their
phenomenology. For pure wino dark matter relevant to the LHC, PAMELA and GLAST
should report signals.
|
[
{
"created": "Wed, 9 Jul 2008 19:03:22 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Oct 2008 18:16:41 GMT",
"version": "v2"
}
] |
2008-10-16
|
[
[
"Grajek",
"Phill",
""
],
[
"Kane",
"Gordon",
""
],
[
"Phalen",
"Daniel J.",
""
],
[
"Pierce",
"Aaron",
""
],
[
"Watson",
"Scott",
""
]
] |
We revisit indirect detection possibilities for neutralino dark matter, emphasizing the complementary roles of different approaches. While thermally produced dark matter often requires large astrophysical "boost factors" to observe antimatter signals, the physically motivated alternative of non-thermal dark matter can naturally provide interesting signals, for example from light wino or Higgsino dark matter. After a brief review of cosmic ray propagation, we discuss signals for positrons, antiprotons, synchrotron radiation and gamma rays from wino annihilation in the galactic halo, and examine their phenomenology. For pure wino dark matter relevant to the LHC, PAMELA and GLAST should report signals.
|
hep-ph/9801318
|
Youli Kanev
|
R. D. Field and Y. A. Kanev
|
Using Collider Event Topology in the Search for the Six-Jet Decay of Top
Quark-Antiquark Pairs
|
LaTeX, 19 pages, 13 figures
| null | null |
UFIFT--HEP-97-31
|
hep-ph
| null |
We investigate the use of the event topology as a tool in the search for the
six-jet decay of top-pair production in proton-antiproton collisions at 1.8
TeV. Modified Fox-Wolfram "shape" variables, H_i, are employed to help
distinguish the top-pair signal from the ordinary QCD multi-jet background. The
H's can be constructed directly from the calorimeter cells or from jets. Events
are required to lie in a region of H-space defined by L_i < H_i < R_i for
i=1,...,,6, where the left, L_i, and right, R_i, cuts are determined by a
genetic algorithm (GA) procedure to maximize the signal over the square root of
the background. We are able to reduce the background over the signal to less
than a factor of 100 using purely topological methods without using jet
multiplicity cuts and without the aid of b-quark tagging.
|
[
{
"created": "Fri, 16 Jan 1998 01:33:13 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Field",
"R. D.",
""
],
[
"Kanev",
"Y. A.",
""
]
] |
We investigate the use of the event topology as a tool in the search for the six-jet decay of top-pair production in proton-antiproton collisions at 1.8 TeV. Modified Fox-Wolfram "shape" variables, H_i, are employed to help distinguish the top-pair signal from the ordinary QCD multi-jet background. The H's can be constructed directly from the calorimeter cells or from jets. Events are required to lie in a region of H-space defined by L_i < H_i < R_i for i=1,...,,6, where the left, L_i, and right, R_i, cuts are determined by a genetic algorithm (GA) procedure to maximize the signal over the square root of the background. We are able to reduce the background over the signal to less than a factor of 100 using purely topological methods without using jet multiplicity cuts and without the aid of b-quark tagging.
|
hep-ph/0702159
|
Joseph F. Owens
|
J.F. Owens, J. Huston, C.E. Keppel, S. Kuhlmann, J.G. Morfin, F.
Olness, J. Pumplin, and D. Stump
|
The impact of new neutrino DIS and Drell-Yan data on large-x parton
distributions
|
24 pages, 13 figures
|
Phys.Rev.D75:054030,2007
|
10.1103/PhysRevD.75.054030
|
FSUHEP-070215
|
hep-ph
| null |
New data sets have recently become available for neutrino and antineutrino
deep inelastic scattering on nuclear targets and for inclusive dimuon
production in pp pd interactions. These data sets are sensitive to different
combinations of parton distribution functions in the large-x region and,
therefore, provide different constraints when incorporated into global parton
distribution function fits. We compare and contrast the effects of these new
data on parton distribution fits, with special emphasis on the effects at large
x. The effects of the use of nuclear targets in the neutrino and antineutrino
data sets are also investigated.
|
[
{
"created": "Thu, 15 Feb 2007 20:01:21 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Owens",
"J. F.",
""
],
[
"Huston",
"J.",
""
],
[
"Keppel",
"C. E.",
""
],
[
"Kuhlmann",
"S.",
""
],
[
"Morfin",
"J. G.",
""
],
[
"Olness",
"F.",
""
],
[
"Pumplin",
"J.",
""
],
[
"Stump",
"D.",
""
]
] |
New data sets have recently become available for neutrino and antineutrino deep inelastic scattering on nuclear targets and for inclusive dimuon production in pp pd interactions. These data sets are sensitive to different combinations of parton distribution functions in the large-x region and, therefore, provide different constraints when incorporated into global parton distribution function fits. We compare and contrast the effects of these new data on parton distribution fits, with special emphasis on the effects at large x. The effects of the use of nuclear targets in the neutrino and antineutrino data sets are also investigated.
|
hep-ph/9502273
|
Bob Holdom
|
B. Holdom
|
New Third-family Flavor Physics: Vertex Corrections
|
8 pages, uuencoded PS file, also available in plain PS, PDF, and GIF
formats on WWW at http://bigmac2.physics.utoronto.ca/BHpapers.html
|
Phys.Lett. B351 (1995) 279-283
|
10.1016/0370-2693(95)00331-E
|
UTPT-95-01
|
hep-ph
| null |
As described previously, a new massive gauge boson (X) coupling only to the
third family produces a tantalizing pattern of deviations away from the
standard model. These include increasing Gamma_b/Gamma_h and decreasing the
alpha_s(M_Z) extracted from Gamma_h/Gamma_ell . We review the status of these
X-Z mixing effects. We then calculate X boson induced vertex corrections to Z
partial decay widths and to ttbar production in ppbar colliders.
|
[
{
"created": "Fri, 10 Feb 1995 20:46:20 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Holdom",
"B.",
""
]
] |
As described previously, a new massive gauge boson (X) coupling only to the third family produces a tantalizing pattern of deviations away from the standard model. These include increasing Gamma_b/Gamma_h and decreasing the alpha_s(M_Z) extracted from Gamma_h/Gamma_ell . We review the status of these X-Z mixing effects. We then calculate X boson induced vertex corrections to Z partial decay widths and to ttbar production in ppbar colliders.
|
hep-ph/9903426
|
Kornelija Passek
|
B. Melic, B. Nizic and K. Passek
|
On the complete next-to-leading order pQCD prediction for the pion form
factor
|
8 pages, 2 figures included; talk presented by K. Passek at Nuclear
and Particle Physics with CEBAF at Jefferson Lab Conference, Dubrovnik, 3-10
November 1998
|
Fizika B8:327-334,1999
| null |
IRB-TH-2/99
|
hep-ph
| null |
We comment on the results of a complete leading-twist next-to-leading order
QCD analysis of the spacelike pion electromagnetic form factor at
large-momentum transfer Q. For the asymptotic distribution amplitude, we have
examined the sensitivity of the predictions to the choice of the
renormalization scale. The results show that reliable perturbative predictions
for the pion electromagnetic form factor can already be made at a momentum
transfer Q below 10 GeV.
|
[
{
"created": "Sun, 21 Mar 1999 21:46:05 GMT",
"version": "v1"
}
] |
2009-08-25
|
[
[
"Melic",
"B.",
""
],
[
"Nizic",
"B.",
""
],
[
"Passek",
"K.",
""
]
] |
We comment on the results of a complete leading-twist next-to-leading order QCD analysis of the spacelike pion electromagnetic form factor at large-momentum transfer Q. For the asymptotic distribution amplitude, we have examined the sensitivity of the predictions to the choice of the renormalization scale. The results show that reliable perturbative predictions for the pion electromagnetic form factor can already be made at a momentum transfer Q below 10 GeV.
|
1707.09089
|
Jonathan Miller
|
Jonathan Miller, Roman Pasechnik
|
Exotic Trajectories Effects on Neutrino Oscillations
|
4 pages, 6 figures
| null | null | null |
hep-ph hep-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, for the first time, exotic loop trajectories were observed in a
photon triple slit experiment. We discuss possible origins and potential
impacts of analogical exotic trajectories in neutrino production, propagation
and detection onto the neutrino oscillation observables.
|
[
{
"created": "Fri, 28 Jul 2017 02:25:58 GMT",
"version": "v1"
}
] |
2017-07-31
|
[
[
"Miller",
"Jonathan",
""
],
[
"Pasechnik",
"Roman",
""
]
] |
Recently, for the first time, exotic loop trajectories were observed in a photon triple slit experiment. We discuss possible origins and potential impacts of analogical exotic trajectories in neutrino production, propagation and detection onto the neutrino oscillation observables.
|
hep-ph/0402069
|
Enke Wang
|
Hanzhong Zhang, Luan Cheng and Enke Wang
|
Critical Behavior of Damping Rate for Plasmon with Finite Momentum in
\phi^4 Theory
|
4 pages, 2 figures
|
Phys.Rev. D70 (2004) 037504
|
10.1103/PhysRevD.70.037504
| null |
hep-ph
| null |
Applying thermal renormalization group (TRG) equations to $\phi^4$ theory
with spontaneous breaking symmetry, we investigate the critical behavior of the
damping rate for the plasmons with finite momentum at the symmetry-restoring
phase transition. From the TRG equation the IR cutoff provided by the external
momentum leads to that the momentum-dependent coupling constant stops running
in the critical region. As the result, the critical slowing down phenomenon
reflecting the inherently IR effect doesn't take place at the critical point
for the plasmon with finite external momentum.
|
[
{
"created": "Fri, 6 Feb 2004 07:18:05 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 2004 19:50:08 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Zhang",
"Hanzhong",
""
],
[
"Cheng",
"Luan",
""
],
[
"Wang",
"Enke",
""
]
] |
Applying thermal renormalization group (TRG) equations to $\phi^4$ theory with spontaneous breaking symmetry, we investigate the critical behavior of the damping rate for the plasmons with finite momentum at the symmetry-restoring phase transition. From the TRG equation the IR cutoff provided by the external momentum leads to that the momentum-dependent coupling constant stops running in the critical region. As the result, the critical slowing down phenomenon reflecting the inherently IR effect doesn't take place at the critical point for the plasmon with finite external momentum.
|
2004.10766
|
Mikko Laine
|
J. Ghiglieri, M. Laine
|
Sterile neutrino dark matter via coinciding resonances
|
14 pages. v2: clarification added
|
JCAP 07(2020)012
|
10.1088/1475-7516/2020/07/012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been proposed that two resonances could coincide in the early universe
at temperatures $T \sim 0.2 ... 0.5$ GeV: one between two nearly degenerate
GeV-scale sterile neutrinos, producing a large lepton asymmetry through
freeze-out and decays; another between medium-modified active neutrinos and
keV-scale sterile neutrinos, converting the lepton asymmetry into dark matter.
Making use of a framework which tracks three sterile neutrinos of both
helicities as well as three separate lepton asymmetries, and scanning the
parameter space of the GeV-scale species, we establish the degree of
fine-tuning that is needed for realizing this scenario.
|
[
{
"created": "Wed, 22 Apr 2020 18:00:05 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jul 2020 12:16:41 GMT",
"version": "v2"
}
] |
2020-07-08
|
[
[
"Ghiglieri",
"J.",
""
],
[
"Laine",
"M.",
""
]
] |
It has been proposed that two resonances could coincide in the early universe at temperatures $T \sim 0.2 ... 0.5$ GeV: one between two nearly degenerate GeV-scale sterile neutrinos, producing a large lepton asymmetry through freeze-out and decays; another between medium-modified active neutrinos and keV-scale sterile neutrinos, converting the lepton asymmetry into dark matter. Making use of a framework which tracks three sterile neutrinos of both helicities as well as three separate lepton asymmetries, and scanning the parameter space of the GeV-scale species, we establish the degree of fine-tuning that is needed for realizing this scenario.
|
1912.08234
|
Rodolfo Capdevilla
|
Rodolfo M. Capdevilla, Roni Harnik, Adam Martin
|
The Radiation Valley and Exotic Resonances in $W\gamma$ Production at
the LHC
|
9 pages text, 7 figures
| null |
10.1007/JHEP03(2020)117
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The tree-level partonic angular distribution of Standard Model $W\gamma$
production possesses a feature known as the Radiation Amplitude Zero (RAZ)
where destructive interference causes the cross section to vanish. At the
proton level the exact cancellation disappears, however, one can find a dip in
the central region of the angular distributions, here called the Radiation
Valley (RV). In this paper, we show how the sensitivity for $W(\ell\nu)\gamma$
resonances can be significantly improved if one focuses on events in the RV
region. Using this technique, we find that the LHC could probe a larger range
of resonance masses, equivalent to increasing the luminosity by a factor of
$2-3$ over conventional searches. The exact increase depends on the spin of the
$W\gamma$ resonance and exactly how it couples to electroweak gauge bosons.
|
[
{
"created": "Tue, 17 Dec 2019 19:12:13 GMT",
"version": "v1"
}
] |
2020-04-22
|
[
[
"Capdevilla",
"Rodolfo M.",
""
],
[
"Harnik",
"Roni",
""
],
[
"Martin",
"Adam",
""
]
] |
The tree-level partonic angular distribution of Standard Model $W\gamma$ production possesses a feature known as the Radiation Amplitude Zero (RAZ) where destructive interference causes the cross section to vanish. At the proton level the exact cancellation disappears, however, one can find a dip in the central region of the angular distributions, here called the Radiation Valley (RV). In this paper, we show how the sensitivity for $W(\ell\nu)\gamma$ resonances can be significantly improved if one focuses on events in the RV region. Using this technique, we find that the LHC could probe a larger range of resonance masses, equivalent to increasing the luminosity by a factor of $2-3$ over conventional searches. The exact increase depends on the spin of the $W\gamma$ resonance and exactly how it couples to electroweak gauge bosons.
|
1808.02383
|
Raghunath Sahoo
|
Arvind Khuntia, Himanshu Sharma, Swatantra Kumar Tiwari, Raghunath
Sahoo, and Jean Cleymans
|
Radial Flow and Differential Freeze-out in Proton-Proton Collisions at
$\sqrt{s}= 7$ TeV at the LHC
|
Published version
|
Eur. Phys. J. A (2019) 55: 3
|
10.1140/epja/i2019-12669-6
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse the transverse momentum ($p_{\rm T}$)-spectra as a function of
charged-particle multiplicity at midrapidity ($|y| < 0.5$) for various
identified particles such as $\pi^{\pm}$, $K^{\pm}$, $K_S^0$, $p+\overline{p}$,
$\phi$, $K^{*0} + \overline {K^{*0}}$, and $\Lambda$ + $\bar{\Lambda}$ in
proton-proton collisions at $\sqrt{s}$ = 7 TeV using Boltzmann-Gibbs Blast Wave
(BGBW) model and thermodynamically consistent Tsallis distribution function. We
obtain the multiplicity dependent kinetic freeze-out temperature ($T_{\rm
kin}$) and radial flow ($\beta$) of various particles after fitting the $p_{\rm
T}$-distribution with BGBW model. Here, $T_{\rm kin}$ exhibits mild dependence
on multiplicity class while $\beta$ shows almost independent behaviour. The
information regarding Tsallis temperature and the non-extensivity parameter
($q$) are drawn by fitting the $p_{\rm T}$-spectra with Tsallis distribution
function. The extracted parameters of these particles are studied as a function
of charged particle multiplicity density ($dN_{ch}/d\eta$). In addition to
this, we also study these parameters as a function of particle mass to observe
any possible mass ordering. All the identified hadrons show a mass ordering in
temperature, non-extensive parameter and also a strong dependence on
multiplicity classes, except the lighter particles. It is observed that as the
particle multiplicity increases, the $q$-parameter approaches to
Boltzmann-Gibbs value, hence a conclusion can be drawn that system tends to
thermal equilibrium. The observations are consistent with a differential
freeze-out scenario of the produced particles.
|
[
{
"created": "Mon, 6 Aug 2018 10:51:46 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jan 2019 09:11:56 GMT",
"version": "v2"
}
] |
2019-01-17
|
[
[
"Khuntia",
"Arvind",
""
],
[
"Sharma",
"Himanshu",
""
],
[
"Tiwari",
"Swatantra Kumar",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Cleymans",
"Jean",
""
]
] |
We analyse the transverse momentum ($p_{\rm T}$)-spectra as a function of charged-particle multiplicity at midrapidity ($|y| < 0.5$) for various identified particles such as $\pi^{\pm}$, $K^{\pm}$, $K_S^0$, $p+\overline{p}$, $\phi$, $K^{*0} + \overline {K^{*0}}$, and $\Lambda$ + $\bar{\Lambda}$ in proton-proton collisions at $\sqrt{s}$ = 7 TeV using Boltzmann-Gibbs Blast Wave (BGBW) model and thermodynamically consistent Tsallis distribution function. We obtain the multiplicity dependent kinetic freeze-out temperature ($T_{\rm kin}$) and radial flow ($\beta$) of various particles after fitting the $p_{\rm T}$-distribution with BGBW model. Here, $T_{\rm kin}$ exhibits mild dependence on multiplicity class while $\beta$ shows almost independent behaviour. The information regarding Tsallis temperature and the non-extensivity parameter ($q$) are drawn by fitting the $p_{\rm T}$-spectra with Tsallis distribution function. The extracted parameters of these particles are studied as a function of charged particle multiplicity density ($dN_{ch}/d\eta$). In addition to this, we also study these parameters as a function of particle mass to observe any possible mass ordering. All the identified hadrons show a mass ordering in temperature, non-extensive parameter and also a strong dependence on multiplicity classes, except the lighter particles. It is observed that as the particle multiplicity increases, the $q$-parameter approaches to Boltzmann-Gibbs value, hence a conclusion can be drawn that system tends to thermal equilibrium. The observations are consistent with a differential freeze-out scenario of the produced particles.
|
1602.07748
|
Christopher Potter
|
C.T. Potter
|
DSiD: a Delphes Detector for ILC Physics Studies
|
Talk presented at the International Workshop on Future Linear
Colliders (LCWS15), Whistler, Canada, 2-6 November 2015. Expanded discussion,
added references, corrected typographical errors
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe DSiD, a fast simulation Delphes detector for the International
Linear Collider (ILC) based on the full simulation performance of the SiD
detector. SiD is one of two detectors described in the ILC Technical Design
Report (TDR). The tracking efficiency, tracking momentum resolution,
electromagnetic and hadronic calorimeter energy resolution, particle
identification and flavor tagging efficiencies are taken from the Detailed
Baseline Design (DBD) study as described in ILC TDR Volume 4: Detectors. In a
cross-check study with $4 \times 10^6$ $e^+ e^- \rightarrow b \bar{b}$ events
generated at $\sqrt{s}=500$ GeV and simulated by Delphes with the DSiD detector
card, these performance characteristics are measured and found to be
commensurate with the DBD results. For a new physics use case example, we
describe a study of Next-to-Minimal Supersymmetric $e^+ e^- \rightarrow 2
\chi_3 \rightarrow 2\chi_1 2 h_1$ with $h_1 \rightarrow 2a_1$ or $h_1
\rightarrow b\bar{b}$ at the $\sqrt{s}=500$ GeV ILC. The card is available on
HepForge.
|
[
{
"created": "Wed, 24 Feb 2016 23:08:12 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Mar 2016 22:09:44 GMT",
"version": "v2"
}
] |
2016-03-16
|
[
[
"Potter",
"C. T.",
""
]
] |
We describe DSiD, a fast simulation Delphes detector for the International Linear Collider (ILC) based on the full simulation performance of the SiD detector. SiD is one of two detectors described in the ILC Technical Design Report (TDR). The tracking efficiency, tracking momentum resolution, electromagnetic and hadronic calorimeter energy resolution, particle identification and flavor tagging efficiencies are taken from the Detailed Baseline Design (DBD) study as described in ILC TDR Volume 4: Detectors. In a cross-check study with $4 \times 10^6$ $e^+ e^- \rightarrow b \bar{b}$ events generated at $\sqrt{s}=500$ GeV and simulated by Delphes with the DSiD detector card, these performance characteristics are measured and found to be commensurate with the DBD results. For a new physics use case example, we describe a study of Next-to-Minimal Supersymmetric $e^+ e^- \rightarrow 2 \chi_3 \rightarrow 2\chi_1 2 h_1$ with $h_1 \rightarrow 2a_1$ or $h_1 \rightarrow b\bar{b}$ at the $\sqrt{s}=500$ GeV ILC. The card is available on HepForge.
|
2309.09533
|
Kalyan Dey
|
Hushnud Hushnud, Omveer Singh, Srikanta Kumar Tripathy, Aditya Nath
Mishra, Kalyan Dey
|
Effect of event classifiers on jet quenching-like signatures in
high-multiplicity $p+p$ collisions at $\sqrt{s} = 13$ TeV
|
7 pages, 6 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
The motivation behind exploring jet quenching-like phenomena in small systems
arises from the experimental observation of heavy-ion-like behavior of particle
production in high-multiplicity proton-proton ($p+p$) collisions. Quantifying
the jet quenching in $p+p$ collisions is a challenging task, as the magnitude
of the nuclear modification factor ($R_{\rm AA}$ or $R_{\rm CP}$), which is
used to quantify jet quenching, is influenced by several factors, such as the
estimation of centrality and the scaling factor. The most common method of
centrality estimation employed by the ALICE collaboration is based on measuring
charged-particle multiplicity with the V0 detector situated at the forward
rapidity. This technique of centrality estimation makes the event sample biased
towards hard processes like multijet final states. This bias of the V0 detector
towards hard processes makes it difficult to study the jet quenching effect in
high-multiplicity $p+p$ collisions. In the present article, we propose to
explore the use of a new and robust event classifier, flattenicity which is
sensitive to both the multiple soft partonic interactions and hard processes.
The $\mathcal{P}_{\rm CP}$, a quantity analogous to $R_{\rm CP}$, has been
estimated for high-multiplicity $p+p$ collisions at $\sqrt{s} = 13$ TeV using
\texttt{PYTHIA8} model for both the V0M (the multiplicity classes selected
based on V0 detector acceptance) as well as flattenicity. The evolution of
$\mathcal{P}_{\rm CP}$ with $p_{\rm T}$ shows a heavy-ion-like effect for
flattencity which is attributed to the selection of softer transverse momentum
particles in high-multiplicity $p+p$ collisions.
|
[
{
"created": "Mon, 18 Sep 2023 07:23:16 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Nov 2023 15:12:44 GMT",
"version": "v2"
}
] |
2023-11-14
|
[
[
"Hushnud",
"Hushnud",
""
],
[
"Singh",
"Omveer",
""
],
[
"Tripathy",
"Srikanta Kumar",
""
],
[
"Mishra",
"Aditya Nath",
""
],
[
"Dey",
"Kalyan",
""
]
] |
The motivation behind exploring jet quenching-like phenomena in small systems arises from the experimental observation of heavy-ion-like behavior of particle production in high-multiplicity proton-proton ($p+p$) collisions. Quantifying the jet quenching in $p+p$ collisions is a challenging task, as the magnitude of the nuclear modification factor ($R_{\rm AA}$ or $R_{\rm CP}$), which is used to quantify jet quenching, is influenced by several factors, such as the estimation of centrality and the scaling factor. The most common method of centrality estimation employed by the ALICE collaboration is based on measuring charged-particle multiplicity with the V0 detector situated at the forward rapidity. This technique of centrality estimation makes the event sample biased towards hard processes like multijet final states. This bias of the V0 detector towards hard processes makes it difficult to study the jet quenching effect in high-multiplicity $p+p$ collisions. In the present article, we propose to explore the use of a new and robust event classifier, flattenicity which is sensitive to both the multiple soft partonic interactions and hard processes. The $\mathcal{P}_{\rm CP}$, a quantity analogous to $R_{\rm CP}$, has been estimated for high-multiplicity $p+p$ collisions at $\sqrt{s} = 13$ TeV using \texttt{PYTHIA8} model for both the V0M (the multiplicity classes selected based on V0 detector acceptance) as well as flattenicity. The evolution of $\mathcal{P}_{\rm CP}$ with $p_{\rm T}$ shows a heavy-ion-like effect for flattencity which is attributed to the selection of softer transverse momentum particles in high-multiplicity $p+p$ collisions.
|
hep-ph/0210096
|
Xmeng
|
Xinhe Meng, Jingmin Hou, Kaiyi Lu and Wenyao Zhao
|
Tests for Cosmological Evolution of a Brane Universe Model
|
12 pages, 5 figures, to appear in IJMPD
|
Int.J.Mod.Phys. D12 (2003) 369-380
|
10.1142/S0218271803002767
|
NKU-0210
|
hep-ph
| null |
The relativistic Friedmann Lemaitre cosmology model (FLCM) is very sucessful
to describe the evolution history of the Universe from the " First three
Minutes". Any alternative model should be consistent with the FLCM explanations
to the later stage evolutions of the Universe at certain points. An noncompact
extra dimension model was recently proposed by Randall and Sundrum. Binetruy et
al. obtained the modified Friedmann equation, in which the energy density of
the brane appears quadratically in contrast with the linear behavior of the
standard Friedmann equation. We investigate kinds of classical cosmological
effects of the new models and get a general solution of the cosmic evolution
for this extended model, with more detail discussions of the brane tension
parameter on these cosmological tests.
|
[
{
"created": "Mon, 7 Oct 2002 09:22:33 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Meng",
"Xinhe",
""
],
[
"Hou",
"Jingmin",
""
],
[
"Lu",
"Kaiyi",
""
],
[
"Zhao",
"Wenyao",
""
]
] |
The relativistic Friedmann Lemaitre cosmology model (FLCM) is very sucessful to describe the evolution history of the Universe from the " First three Minutes". Any alternative model should be consistent with the FLCM explanations to the later stage evolutions of the Universe at certain points. An noncompact extra dimension model was recently proposed by Randall and Sundrum. Binetruy et al. obtained the modified Friedmann equation, in which the energy density of the brane appears quadratically in contrast with the linear behavior of the standard Friedmann equation. We investigate kinds of classical cosmological effects of the new models and get a general solution of the cosmic evolution for this extended model, with more detail discussions of the brane tension parameter on these cosmological tests.
|
1003.5483
|
Sabir Ramazanov Ramazanovich
|
Sergey Mironov, Mikhail Osipov, Sabir Ramazanov
|
Standard Model in adS slice with UV-localized Higgs field
|
20 pages, 3 figures, Journal version
|
Int.J.Mod.Phys.A25:3641-3660,2010
|
10.1142/S0217751X10049797
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss five-dimensional Standard Model in a slice of adS space-time with
the Higgs field residing near or on the UV brane. Allowing fermion fields to
propagate in the bulk, we obtain the hierarchy of their masses and quark
mixings without introducing large or small Yukawa couplings. However, the
interaction of fermions with the Higgs and gauge boson KK excitations gives
rise to FCNC with no built-in suppression mechanism. This strongly constrains
the scale of KK masses. We also discuss neutrino mass generation via KK
excitations of the Higgs field. We find that this mechanism is subdominant in
the scenarios of spontaneous symmetry breaking we consider.
|
[
{
"created": "Mon, 29 Mar 2010 10:05:31 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 2010 18:36:23 GMT",
"version": "v2"
}
] |
2010-11-24
|
[
[
"Mironov",
"Sergey",
""
],
[
"Osipov",
"Mikhail",
""
],
[
"Ramazanov",
"Sabir",
""
]
] |
We discuss five-dimensional Standard Model in a slice of adS space-time with the Higgs field residing near or on the UV brane. Allowing fermion fields to propagate in the bulk, we obtain the hierarchy of their masses and quark mixings without introducing large or small Yukawa couplings. However, the interaction of fermions with the Higgs and gauge boson KK excitations gives rise to FCNC with no built-in suppression mechanism. This strongly constrains the scale of KK masses. We also discuss neutrino mass generation via KK excitations of the Higgs field. We find that this mechanism is subdominant in the scenarios of spontaneous symmetry breaking we consider.
|
hep-ph/0403119
|
Valery Lyubovitskij
|
K. Khosonthongkee (Tuebingen and Suranaree U.), V.E. Lyubovitskij
(Tuebingen U.), Th. Gutsche (Tuebingen U.), Amand Faessler (Tuebingen U.), K.
Pumsa-ard (Tuebingen U.), S. Cheedket (Suranaree U.), Y. Yan (Suranaree U.)
|
Axial form factor of the nucleon in the perturbative chiral quark model
|
23 pages, 5 figures, accepted for publication in J. Phys. G
|
J.Phys.G30:793-810,2004
|
10.1088/0954-3899/30/6/009
| null |
hep-ph
| null |
We apply the perturbative chiral quark model (PCQM) at one loop to analyze
the axial form factor of the nucleon. This chiral quark model is based on an
effective Lagrangian, where baryons are described by relativistic valence
quarks and a perturbative cloud of Goldstone bosons as dictated by chiral
symmetry. We apply the formalism to obtain analytical expressions for the axial
form factor of the nucleon, which is given in terms of fundamental parameters
of low-energy pion-nucleon physics (weak pion decay constant, strong
pion-nucleon form factor) and of only one model parameter (radius of the
nucleonic three-quark core).
|
[
{
"created": "Thu, 11 Mar 2004 13:43:06 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Khosonthongkee",
"K.",
"",
"Tuebingen and Suranaree U."
],
[
"Lyubovitskij",
"V. E.",
"",
"Tuebingen U."
],
[
"Gutsche",
"Th.",
"",
"Tuebingen U."
],
[
"Faessler",
"Amand",
"",
"Tuebingen U."
],
[
"Pumsa-ard",
"K.",
"",
"Tuebingen U."
],
[
"Cheedket",
"S.",
"",
"Suranaree U."
],
[
"Yan",
"Y.",
"",
"Suranaree U."
]
] |
We apply the perturbative chiral quark model (PCQM) at one loop to analyze the axial form factor of the nucleon. This chiral quark model is based on an effective Lagrangian, where baryons are described by relativistic valence quarks and a perturbative cloud of Goldstone bosons as dictated by chiral symmetry. We apply the formalism to obtain analytical expressions for the axial form factor of the nucleon, which is given in terms of fundamental parameters of low-energy pion-nucleon physics (weak pion decay constant, strong pion-nucleon form factor) and of only one model parameter (radius of the nucleonic three-quark core).
|
hep-ph/0207372
|
Antonio Soares de Castro
|
W.S. Carvalho, A.S. de Castro, A.C.B. Antunes
|
SU(3) Mixing for Excited Mesons
| null |
J.Phys.A35:7585-7596,2002
|
10.1088/0305-4470/35/35/303
| null |
hep-ph
| null |
The SU(3)-flavor symmetry breaking and the quark-antiquark annihilation
mechanism are taken into account for describing the singlet-octet mixing for
several nonets assigned by Particle Data Group(PDG). This task is approached
with the mass matrix formalism.
|
[
{
"created": "Wed, 31 Jul 2002 19:38:55 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Carvalho",
"W. S.",
""
],
[
"de Castro",
"A. S.",
""
],
[
"Antunes",
"A. C. B.",
""
]
] |
The SU(3)-flavor symmetry breaking and the quark-antiquark annihilation mechanism are taken into account for describing the singlet-octet mixing for several nonets assigned by Particle Data Group(PDG). This task is approached with the mass matrix formalism.
|
1110.6428
|
Ted Rogers
|
S. Mert Aybat, John C. Collins, Jian-Wei Qiu, and Ted C. Rogers
|
The QCD Evolution of the Sivers Function
|
Version Published in Physical Review D, 16 pages, 3 figures, 1 table,
Modified References
| null |
10.1103/PhysRevD.85.034043
|
NIKHEF-2011-030; YITP-SB-11-37
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the Collins-Soper-Sterman (CSS) formalism to apply it to the
spin-dependence governed by the Sivers function. We use it to give a correct
numerical QCD evolution of existing fixed-scale fits of the Sivers function.
With the aid of approximations useful for the non-perturbative region, we
present the results as parametrizations of a Gaussian form in transverse
momentum space, rather than in the Fourier conjugate transverse coordinate
space normally used in the CSS formalism. They are specifically valid at small
transverse momentum. Since evolution has been applied, our results can be used
to make predictions for Drell-Yan and semi-inclusive deep inelastic scattering
at energies different from those where the original fits were made. Our evolved
functions are of a form that they can be used in the same parton model
factorization formulas as used in the original fits, but now with a predicted
scale dependence in the fit parameters. We also present a method by which our
evolved functions can be corrected to allow for twist-3 contributions at large
parton transverse momentum.
|
[
{
"created": "Fri, 28 Oct 2011 19:30:46 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2011 20:11:17 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Mar 2012 23:13:30 GMT",
"version": "v3"
}
] |
2013-05-30
|
[
[
"Aybat",
"S. Mert",
""
],
[
"Collins",
"John C.",
""
],
[
"Qiu",
"Jian-Wei",
""
],
[
"Rogers",
"Ted C.",
""
]
] |
We extend the Collins-Soper-Sterman (CSS) formalism to apply it to the spin-dependence governed by the Sivers function. We use it to give a correct numerical QCD evolution of existing fixed-scale fits of the Sivers function. With the aid of approximations useful for the non-perturbative region, we present the results as parametrizations of a Gaussian form in transverse momentum space, rather than in the Fourier conjugate transverse coordinate space normally used in the CSS formalism. They are specifically valid at small transverse momentum. Since evolution has been applied, our results can be used to make predictions for Drell-Yan and semi-inclusive deep inelastic scattering at energies different from those where the original fits were made. Our evolved functions are of a form that they can be used in the same parton model factorization formulas as used in the original fits, but now with a predicted scale dependence in the fit parameters. We also present a method by which our evolved functions can be corrected to allow for twist-3 contributions at large parton transverse momentum.
|
2003.11264
|
Chien Yeah Seng
|
Chien-Yeah Seng, Xu Feng, Mikhail Gorchtein, Lu-Chang Jin
|
Joint lattice QCD - dispersion theory analysis confirms the quark-mixing
top-row unitarity deficit
|
Version to appear in Physical Review D, Rapid Communication
|
Phys. Rev. D 101, 111301 (2020)
|
10.1103/PhysRevD.101.111301
| null |
hep-ph hep-ex hep-lat nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the first ever lattice computation of the $\gamma W$-box radiative
correction to the rate of the semileptonic pion decay allowed for a reduction
of the theory uncertainty of that rate by a factor of $\sim3$. A recent
dispersion evaluation of the $\gamma W$-box correction on the neutron also led
to a significant reduction of the theory uncertainty, but shifted the value of
$V_{ud}$ extracted from the neutron and superallowed nuclear $\beta$ decay,
resulting in a deficit of the CKM unitarity in the top row. A direct lattice
computation of the $\gamma W$-box correction for the neutron decay would
provide an independent cross-check for this result but is very challenging.
Before those challenges are overcome, we propose a hybrid analysis, converting
the lattice calculation on the pion to that on the neutron by a combination of
dispersion theory and phenomenological input. The new prediction for the
universal radiative correction to free and bound neutron $\beta$-decay reads
$\Delta_R^V=0.02477(24)$, in excellent agreement with the dispersion theory
result $\Delta_R^V=0.02467(22)$. Combining with other relevant information, the
top-row CKM unitarity deficit persists.
|
[
{
"created": "Wed, 25 Mar 2020 08:07:19 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 2020 21:19:50 GMT",
"version": "v2"
}
] |
2020-07-01
|
[
[
"Seng",
"Chien-Yeah",
""
],
[
"Feng",
"Xu",
""
],
[
"Gorchtein",
"Mikhail",
""
],
[
"Jin",
"Lu-Chang",
""
]
] |
Recently, the first ever lattice computation of the $\gamma W$-box radiative correction to the rate of the semileptonic pion decay allowed for a reduction of the theory uncertainty of that rate by a factor of $\sim3$. A recent dispersion evaluation of the $\gamma W$-box correction on the neutron also led to a significant reduction of the theory uncertainty, but shifted the value of $V_{ud}$ extracted from the neutron and superallowed nuclear $\beta$ decay, resulting in a deficit of the CKM unitarity in the top row. A direct lattice computation of the $\gamma W$-box correction for the neutron decay would provide an independent cross-check for this result but is very challenging. Before those challenges are overcome, we propose a hybrid analysis, converting the lattice calculation on the pion to that on the neutron by a combination of dispersion theory and phenomenological input. The new prediction for the universal radiative correction to free and bound neutron $\beta$-decay reads $\Delta_R^V=0.02477(24)$, in excellent agreement with the dispersion theory result $\Delta_R^V=0.02467(22)$. Combining with other relevant information, the top-row CKM unitarity deficit persists.
|
0802.0177
|
Alan D. Martin
|
V.A. Khoze, A.D. Martin and M.G. Ryskin
|
Early LHC measurements to check predictions for central exclusive
production
|
28 pages, 12 figures; text clarified, new figure added, version to be
published in Eur. Phys. J. C
|
Eur.Phys.J.C55:363-375,2008
|
10.1140/epjc/s10052-008-0611-9
|
IPPP/08/07, DCPT/08/14
|
hep-ph
| null |
We show how the early data runs of the LHC can provide valuable checks of the
different components of the formalism used to predict the cross sections of
central exclusive processes. The `soft' rapidity gap survival factor can be
studied in electroweak processes, such as W+gaps events, where the bare
amplitude is well known. The generalized gluon distribution, in the appropriate
kinematic region, can be probed by exclusive Upsilon production. The
perturbative QCD effects, especially the Sudakov-like factor, can be probed by
exclusive two- and three-jet production. We discuss the possible role of
enhanced absorptive corrections which would violate the soft-hard factorization
implied in the usual formalism, and suggest ways that the LHC may explore their
presence.
|
[
{
"created": "Fri, 1 Feb 2008 17:47:49 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Mar 2008 11:08:36 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Khoze",
"V. A.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] |
We show how the early data runs of the LHC can provide valuable checks of the different components of the formalism used to predict the cross sections of central exclusive processes. The `soft' rapidity gap survival factor can be studied in electroweak processes, such as W+gaps events, where the bare amplitude is well known. The generalized gluon distribution, in the appropriate kinematic region, can be probed by exclusive Upsilon production. The perturbative QCD effects, especially the Sudakov-like factor, can be probed by exclusive two- and three-jet production. We discuss the possible role of enhanced absorptive corrections which would violate the soft-hard factorization implied in the usual formalism, and suggest ways that the LHC may explore their presence.
|
1012.4123
|
Zralek Marek
|
M. Ochman, R. Szafron and M. Zralek
|
New Physics and Neutrino Oscillation
|
3 pages. Talk given at NOW 2010: Neutrino Oscillation Workshop, Conca
Specchiulla (Otranto), Lecce, Italy, 4-11 Sep 2010
| null |
10.1016/j.nuclphysbps.2011.04.135
| null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/3.0/
|
Description of neutrino oscillation in the case of Non-Standard neutrino
Interaction (NSI) is briefly presented. The NSI causes the entanglement between
internal degrees of freedom of neutrinos (mass, spin, flavour) and other
accompanying particles in the production and detection processes. In such case
neutrinos are mostly in the mixed states. Role of the density matrix in
description of neutrino oscillation process is shortly explained.
|
[
{
"created": "Sat, 18 Dec 2010 22:08:55 GMT",
"version": "v1"
}
] |
2015-05-20
|
[
[
"Ochman",
"M.",
""
],
[
"Szafron",
"R.",
""
],
[
"Zralek",
"M.",
""
]
] |
Description of neutrino oscillation in the case of Non-Standard neutrino Interaction (NSI) is briefly presented. The NSI causes the entanglement between internal degrees of freedom of neutrinos (mass, spin, flavour) and other accompanying particles in the production and detection processes. In such case neutrinos are mostly in the mixed states. Role of the density matrix in description of neutrino oscillation process is shortly explained.
|
1208.4495
|
Luca Fabbri
|
Luca Fabbri
|
A Torsional Model of Leptons
|
6 pages
|
Mod.Phys.Lett.A27, 1250199 (2012)
|
10.1142/S0217732312501994
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quite recently it was shown that torsion induces interactions among leptons
that are identical to the weak interactions of leptons of the Weinberg standard
model, if it is in terms of leptonic bound states that the bosonic sector is
built: here we obtain the partially conserved axial currents showing that they
are the same of the standard model, if the composite mediators have specific
mass relationships: we show that their masses are indeed the measured ones, if
reasonable approximations are taken.
|
[
{
"created": "Wed, 22 Aug 2012 13:29:21 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Oct 2012 09:38:36 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Dec 2012 12:36:01 GMT",
"version": "v3"
}
] |
2013-01-01
|
[
[
"Fabbri",
"Luca",
""
]
] |
Quite recently it was shown that torsion induces interactions among leptons that are identical to the weak interactions of leptons of the Weinberg standard model, if it is in terms of leptonic bound states that the bosonic sector is built: here we obtain the partially conserved axial currents showing that they are the same of the standard model, if the composite mediators have specific mass relationships: we show that their masses are indeed the measured ones, if reasonable approximations are taken.
|
hep-ph/9812391
|
Alexander Ya. Parkhomenko
|
N.V. Mikheev, A.Ya. Parkhomenko and L.A. Vassilevskaya
|
Field-induced axion emission via process $e^+ e^- \to a$ in plasma
|
8 pages, latex, 4 PS figures
|
Mod.Phys.Lett. A13 (1998) 2593-2600
|
10.1142/S0217732398002758
|
YARU-HE-98/07
|
hep-ph
| null |
The annihilation into axion $e^+ e^- \to a$ is investigated in a plasma and
an external magnetic field. This process via a plasmon intermediate state has a
resonant character at a particular energy of the emitted axion. The emissivity
by $e^+ e^- \to a$ is compared with the axion cyclotron emissivity.
|
[
{
"created": "Wed, 16 Dec 1998 14:20:42 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Mikheev",
"N. V.",
""
],
[
"Parkhomenko",
"A. Ya.",
""
],
[
"Vassilevskaya",
"L. A.",
""
]
] |
The annihilation into axion $e^+ e^- \to a$ is investigated in a plasma and an external magnetic field. This process via a plasmon intermediate state has a resonant character at a particular energy of the emitted axion. The emissivity by $e^+ e^- \to a$ is compared with the axion cyclotron emissivity.
|
hep-ph/9804363
|
Cai-Dian Lue
|
A. Ali (DESY), G. Kramer and C.D. Lu (Hamburg U)
|
Experimental Tests of Factorization in Charmless Non-Leptonic Two-Body B
Decays
|
64 pages (LaTex) including 13 figures, requires epsfig.sty; submitted
to Phys. Rev. D
|
Phys.Rev.D58:094009,1998
|
10.1103/PhysRevD.58.094009
|
DESY 98-041
|
hep-ph hep-ex
| null |
Using a theoretical framework based on the next-to-leading order QCD-improved
effective Hamiltonian and a factorization Ansatz for the hadronic matrix
elements of the four-quark operators, we reassess branching fractions in
two-body non-leptonic decays $B \to PP, PV, VV$, involving the lowest lying
light pseudoscalar $(P)$ and vector $(V)$ mesons in the standard model. Using
the sensitivity of the decay rates on the effective number of colors, $N_c$, as
a criterion of theoretical predictivity, we classify all the current-current
(tree) and penguin transitions in five different classes. The recently measured
charmless two-body $B \to PP$ decays $(B^+ \to K^+ \eta^\prime, B^0 \to K^0
\eta^\prime, B^0 \to K^+\pi^-, B^+ \to \pi^+ K^0$ and charge conjugates) are
dominated by the $N_c$-stable QCD penguins (class-IV transitions) and their
estimates are consistent with data. The measured charmless $B \to PV$ $(B^+ \to
\omega K^+, ~B^+ \to \omega h^+)$ and $B\to VV$ transition $(B \to \phi K^*)$,
on the other hand, belong to the penguin (class-V) and tree (class-III)
transitions. The class-V penguin transitions are in general more difficult to
predict. We propose a number of tests of the factorization framework in terms
of the ratios of branching ratios for some selected $B \to h_1 h_2$ decays
involving light hadrons $h_1$ and $h_2$, which depend only moderately on the
form factors. We also propose a set of measurements to determine the effective
coefficients of the current-current and QCD penguin operators. The potential
impact of $B \to h_1 h_2$ decays on the CKM phenomenology is emphasized by
analyzing a number of decay rates in the factorization framework.
|
[
{
"created": "Wed, 22 Apr 1998 15:34:36 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Ali",
"A.",
"",
"DESY"
],
[
"Kramer",
"G.",
"",
"Hamburg U"
],
[
"Lu",
"C. D.",
"",
"Hamburg U"
]
] |
Using a theoretical framework based on the next-to-leading order QCD-improved effective Hamiltonian and a factorization Ansatz for the hadronic matrix elements of the four-quark operators, we reassess branching fractions in two-body non-leptonic decays $B \to PP, PV, VV$, involving the lowest lying light pseudoscalar $(P)$ and vector $(V)$ mesons in the standard model. Using the sensitivity of the decay rates on the effective number of colors, $N_c$, as a criterion of theoretical predictivity, we classify all the current-current (tree) and penguin transitions in five different classes. The recently measured charmless two-body $B \to PP$ decays $(B^+ \to K^+ \eta^\prime, B^0 \to K^0 \eta^\prime, B^0 \to K^+\pi^-, B^+ \to \pi^+ K^0$ and charge conjugates) are dominated by the $N_c$-stable QCD penguins (class-IV transitions) and their estimates are consistent with data. The measured charmless $B \to PV$ $(B^+ \to \omega K^+, ~B^+ \to \omega h^+)$ and $B\to VV$ transition $(B \to \phi K^*)$, on the other hand, belong to the penguin (class-V) and tree (class-III) transitions. The class-V penguin transitions are in general more difficult to predict. We propose a number of tests of the factorization framework in terms of the ratios of branching ratios for some selected $B \to h_1 h_2$ decays involving light hadrons $h_1$ and $h_2$, which depend only moderately on the form factors. We also propose a set of measurements to determine the effective coefficients of the current-current and QCD penguin operators. The potential impact of $B \to h_1 h_2$ decays on the CKM phenomenology is emphasized by analyzing a number of decay rates in the factorization framework.
|
2002.07159
|
Wim de Boer
|
Conny Beskidt and Wim de Boer
|
Genuine NMSSM deviations in the 125 GeV Higgs boson decays
|
39 pages, 11 figures. arXiv admin note: substantial text overlap with
arXiv:1907.00648
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In Supersymmetry deviations from the SM signal strengths of the 125 GeV Higgs
boson can occur, because of possible SUSY contributions in diagrams with loops,
which leads to different deviations in signal strengths for processes with and
without loop diagrams. In the Next-to Minimal Supersymmetric Standard Model
(NMSSM) additional deviations may occur, because of the mixing with the
additional singlet-like Higgs boson and/or additional decays into pairs of
light particles, like neutralinos, pseudo-scalar Higgs bosons or singlet-like
Higgs bosons. In this paper we study these "genuine" NMSSM deviations in detail
to check not only their possible size, but also look for correlations or
anti-correlations with respect to other channels in the hope to find specific
patterns in the deviations as for the SUSY contributions, which occur
predominantly in processes including loops in the diagrams. The whole NMSSM
parameter space is sampled in a deterministic way. The novel scanning method is
discussed in detail in the Appendix. We found three different regions with
"genuine" NMSSM deviations, which are largely independent of the production
mode. What was surprising: some regions show negativ correlations between final
states with fermions and bosons meaning if the signal strengths for fermions
decrease the signal strengths for bosonic final states increase, while other
regions show positive correlations. The sign of the correlations is a strong
function of the mass difference between the observed 125 GeV Higgs boson and
the Higgs singlet, so looking for correlations could give useful hints about
the existence and mass of the singlet Higgs boson. The features of these
"genuine" NMSSM effects have been investigated in representative benchmark
points for each of the three regions where a single effect is dominant. These
benchmark points have been detailed in the Appendix.
|
[
{
"created": "Sun, 16 Feb 2020 21:18:03 GMT",
"version": "v1"
}
] |
2020-02-19
|
[
[
"Beskidt",
"Conny",
""
],
[
"de Boer",
"Wim",
""
]
] |
In Supersymmetry deviations from the SM signal strengths of the 125 GeV Higgs boson can occur, because of possible SUSY contributions in diagrams with loops, which leads to different deviations in signal strengths for processes with and without loop diagrams. In the Next-to Minimal Supersymmetric Standard Model (NMSSM) additional deviations may occur, because of the mixing with the additional singlet-like Higgs boson and/or additional decays into pairs of light particles, like neutralinos, pseudo-scalar Higgs bosons or singlet-like Higgs bosons. In this paper we study these "genuine" NMSSM deviations in detail to check not only their possible size, but also look for correlations or anti-correlations with respect to other channels in the hope to find specific patterns in the deviations as for the SUSY contributions, which occur predominantly in processes including loops in the diagrams. The whole NMSSM parameter space is sampled in a deterministic way. The novel scanning method is discussed in detail in the Appendix. We found three different regions with "genuine" NMSSM deviations, which are largely independent of the production mode. What was surprising: some regions show negativ correlations between final states with fermions and bosons meaning if the signal strengths for fermions decrease the signal strengths for bosonic final states increase, while other regions show positive correlations. The sign of the correlations is a strong function of the mass difference between the observed 125 GeV Higgs boson and the Higgs singlet, so looking for correlations could give useful hints about the existence and mass of the singlet Higgs boson. The features of these "genuine" NMSSM effects have been investigated in representative benchmark points for each of the three regions where a single effect is dominant. These benchmark points have been detailed in the Appendix.
|
hep-ph/9704422
| null |
H. Walliser (Siegen University)
|
Hot Nucleons in Chiral Soliton Models
|
17 pages (RevTeX), 5 figures
|
Phys.Rev. D56 (1997) 3866-3873
|
10.1103/PhysRevD.56.3866
|
SI-TH-97-1
|
hep-ph
| null |
Chiral lagrangians as effective field theories of QCD are most suitable for
the study of nucleons in a hot pion gas because they contain pions and also
baryons as solitons of the same action. The semiclassical treatment of the
soliton solutions must be augmented by pionic fluctuations which requires
renormalisation to 1-loop, and finite temperatures do not introduce new
ultraviolet divergencies and may easily be considered. Alternatively, a
renormalisation scheme based on the renormalisation group equation at finite
temperature comprises and extends the rigorous results of chiral perturbation
theory and renders the low energy constants temperature-dependent which allows
the construction of temperature-dependent solitons below the critical
temperature. The temperature-dependence of the baryon energy and the
pion-nucleon coupling is studied. There is no simple scaling law for the
temperature-dependence of these quantities.
|
[
{
"created": "Mon, 28 Apr 1997 17:12:49 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Walliser",
"H.",
"",
"Siegen University"
]
] |
Chiral lagrangians as effective field theories of QCD are most suitable for the study of nucleons in a hot pion gas because they contain pions and also baryons as solitons of the same action. The semiclassical treatment of the soliton solutions must be augmented by pionic fluctuations which requires renormalisation to 1-loop, and finite temperatures do not introduce new ultraviolet divergencies and may easily be considered. Alternatively, a renormalisation scheme based on the renormalisation group equation at finite temperature comprises and extends the rigorous results of chiral perturbation theory and renders the low energy constants temperature-dependent which allows the construction of temperature-dependent solitons below the critical temperature. The temperature-dependence of the baryon energy and the pion-nucleon coupling is studied. There is no simple scaling law for the temperature-dependence of these quantities.
|
0803.4120
|
Emiliano Molinaro
|
E. Molinaro, S. T. Petcov
|
The Interplay Between the "Low" and "High" Energy CP-Violation in
Leptogenesis
|
Results unchanged; comments and references added; version to be
puplished in Eur.Phys.J.C
|
Eur.Phys.J.C61:93-109,2009
|
10.1140/epjc/s10052-009-0985-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse within the "flavoured" leptogenesis scenario of baryon asymmetry
generation, the interplay of the "low energy" CP-violation, originating from
the PMNS neutrino mixing matrix $U$, and the "high energy" CP-violation which
can be present in the matrix of neutrino Yukawa couplings, $\lambda$, and can
manifest itself only in "high" energy scale processes. The type I see-saw model
with three heavy right-handed Majorana neutrinos having hierarchical spectrum
is considered. The "orthogonal" parametrisation of the matrix of neutrino
Yukawa couplings, which involves a complex orthogonal matrix $R$, is employed.
In this approach the matrix $R$ is the source of "high energy" CP-violation.
Results for normal hierarchical (NH) and inverted hierarchical (IH) light
neutrino mass spectrum are derived in the case of decoupling of the heaviest RH
Majorana neutrino. It is shown that taking into account the contribution to
$Y_B$ due to the CP-violating phases in the neutrino mixing matrix $U$ can
change drastically the predictions for $Y_B$, obtained assuming only "high
energy" CP-violation from the $R$-matrix is operative in leptogenesis. In the
case of IH spectrum, in particular, there exist significant regions in the
corresponding parameter space where the purely "high energy" contribution in
$Y_B$ plays a subdominant role in the production of baryon asymmetry compatible
with the observations.
|
[
{
"created": "Fri, 28 Mar 2008 14:00:08 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Mar 2009 13:33:17 GMT",
"version": "v2"
}
] |
2009-07-22
|
[
[
"Molinaro",
"E.",
""
],
[
"Petcov",
"S. T.",
""
]
] |
We analyse within the "flavoured" leptogenesis scenario of baryon asymmetry generation, the interplay of the "low energy" CP-violation, originating from the PMNS neutrino mixing matrix $U$, and the "high energy" CP-violation which can be present in the matrix of neutrino Yukawa couplings, $\lambda$, and can manifest itself only in "high" energy scale processes. The type I see-saw model with three heavy right-handed Majorana neutrinos having hierarchical spectrum is considered. The "orthogonal" parametrisation of the matrix of neutrino Yukawa couplings, which involves a complex orthogonal matrix $R$, is employed. In this approach the matrix $R$ is the source of "high energy" CP-violation. Results for normal hierarchical (NH) and inverted hierarchical (IH) light neutrino mass spectrum are derived in the case of decoupling of the heaviest RH Majorana neutrino. It is shown that taking into account the contribution to $Y_B$ due to the CP-violating phases in the neutrino mixing matrix $U$ can change drastically the predictions for $Y_B$, obtained assuming only "high energy" CP-violation from the $R$-matrix is operative in leptogenesis. In the case of IH spectrum, in particular, there exist significant regions in the corresponding parameter space where the purely "high energy" contribution in $Y_B$ plays a subdominant role in the production of baryon asymmetry compatible with the observations.
|
1306.4125
|
Ushak Rahaman
|
Suprabh Prakash, Ushak Rahaman, S. Uma Sankar
|
The need for an early anti-neutrino run of NOvA
| null |
JHEP07 (2014) 070
|
10.1007/JHEP07(2014)070
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The moderately large value of $\ty$, measured recently by reactor
experiments, is very welcome news for the future neutrino experiments. In
particular, the \nova experiment, with 3 years each of $\nu$ and $\anu$ runs,
will be able to determine the mass hierarchy if one of the following two
favourable combinations is true: normal hierarchy with $-180^\circ \leq \dcp
\leq 0$ or inverted hierarchy with $0\leq \dcp \leq 180^\circ$. In this report,
we study the hierarchy reach of the first 3 years of \nova data. Since $\sin^2
2 \tz$ is measured to be non-maximal, $\tz$ can be either in the lower or
higher octant. Pure $\nu$ data is affected by $\ty$-hierarchy and
octant-hierarchy degeneracies, which limit the hierarchy sensitivity of such
data. A combination of $\nu$ and $\anu$ data is not subject to these
degeneracies and hence has much better hierarchy discrimination capability. We
find that, with a 3 year $\nu$ run, hierarchy determination is possible for
only two of the four octant-hierarchy combinations. Equal 1.5 year runs in
$\nu$ and $\anu$ modes give good hierarchy sensitivity for all the four
combinations.
|
[
{
"created": "Tue, 18 Jun 2013 10:06:52 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jul 2014 10:51:14 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Jul 2014 09:32:45 GMT",
"version": "v3"
}
] |
2014-07-24
|
[
[
"Prakash",
"Suprabh",
""
],
[
"Rahaman",
"Ushak",
""
],
[
"Sankar",
"S. Uma",
""
]
] |
The moderately large value of $\ty$, measured recently by reactor experiments, is very welcome news for the future neutrino experiments. In particular, the \nova experiment, with 3 years each of $\nu$ and $\anu$ runs, will be able to determine the mass hierarchy if one of the following two favourable combinations is true: normal hierarchy with $-180^\circ \leq \dcp \leq 0$ or inverted hierarchy with $0\leq \dcp \leq 180^\circ$. In this report, we study the hierarchy reach of the first 3 years of \nova data. Since $\sin^2 2 \tz$ is measured to be non-maximal, $\tz$ can be either in the lower or higher octant. Pure $\nu$ data is affected by $\ty$-hierarchy and octant-hierarchy degeneracies, which limit the hierarchy sensitivity of such data. A combination of $\nu$ and $\anu$ data is not subject to these degeneracies and hence has much better hierarchy discrimination capability. We find that, with a 3 year $\nu$ run, hierarchy determination is possible for only two of the four octant-hierarchy combinations. Equal 1.5 year runs in $\nu$ and $\anu$ modes give good hierarchy sensitivity for all the four combinations.
|
hep-ph/0605205
|
Vincent Mathieu
|
V. Mathieu, C. Semay, B. Silvestre-Brac
|
Semirelativistic potential model for low-lying three-gluon glueballs
|
2 figures
|
Phys.Rev. D74 (2006) 054002
|
10.1103/PhysRevD.74.054002
| null |
hep-ph
| null |
The three-gluon glueball states are studied with the generalization of a
semirelativistic potential model giving good results for two-gluon glueballs.
The Hamiltonian depends only on 3 parameters fixed on two-gluon glueball
spectra: the strong coupling constant, the string tension, and a gluon size
which removes singularities in the potential. The Casimir scaling determines
the structure of the confinement. Low-lying $J^{PC}$ states are computed and
compared with recent lattice calculations. A good agreement is found for
$1^{--}$ and $3^{--}$ states, but our model predicts a $2^{--}$ state much
higher in energy than the lattice result. The $0^{-+}$ mass is also computed.
|
[
{
"created": "Thu, 18 May 2006 12:38:09 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Mathieu",
"V.",
""
],
[
"Semay",
"C.",
""
],
[
"Silvestre-Brac",
"B.",
""
]
] |
The three-gluon glueball states are studied with the generalization of a semirelativistic potential model giving good results for two-gluon glueballs. The Hamiltonian depends only on 3 parameters fixed on two-gluon glueball spectra: the strong coupling constant, the string tension, and a gluon size which removes singularities in the potential. The Casimir scaling determines the structure of the confinement. Low-lying $J^{PC}$ states are computed and compared with recent lattice calculations. A good agreement is found for $1^{--}$ and $3^{--}$ states, but our model predicts a $2^{--}$ state much higher in energy than the lattice result. The $0^{-+}$ mass is also computed.
|
hep-ph/9507313
|
Otto Kong
|
Otto C.W. Kong (Institute of Field Physics, Department of Physics and
Astronomy, University of North Carolina at Chapel Hill)
|
The Light, the Heavy and the Superheavy --- a Nonabelian Flavor Symmetry
for the Full Hierarchy
|
missing title page restored
| null | null |
IFP-719-UNC
|
hep-ph
| null |
We give a preliminary report of a new quark mass matrix model basing on a
$SU(5)\otimes SU(5)\otimes Q_{12}$ symmetry embedding into a fully gauged
$SU(5)\otimes SU(5)\otimes SU(2)$.~\cite{fk} The two $SU(5)$'s contain the
standard SUSY $SU(5)$ as a diagonal subgroup, while the $Q_{12}$ or $SU(2)$ is
horizontal. Starting by assuming a judiciously-chosen set of chiral
supermultiplets, and a pattern of spontaneous symmetry breaking, we obtain the
low-energy chiral fermions together with a spectrum of superheavy fermions at
two different scales. The latter mediate Froggatt-Nielsen tree graphs that give
rise to a phenomenologically viable effective quark mass matrix texture. The
model is the first example of a nontrivial combination of supersymmetry without
R-parity, gauged nonabelian horizontal symmetry and
unification/anti-unification. It is expected to have some very interesting
features in SUSY-GUT phenomenology.
|
[
{
"created": "Sat, 15 Jul 1995 22:52:35 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jul 1995 21:37:43 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Kong",
"Otto C. W.",
"",
"Institute of Field Physics, Department of Physics and\n Astronomy, University of North Carolina at Chapel Hill"
]
] |
We give a preliminary report of a new quark mass matrix model basing on a $SU(5)\otimes SU(5)\otimes Q_{12}$ symmetry embedding into a fully gauged $SU(5)\otimes SU(5)\otimes SU(2)$.~\cite{fk} The two $SU(5)$'s contain the standard SUSY $SU(5)$ as a diagonal subgroup, while the $Q_{12}$ or $SU(2)$ is horizontal. Starting by assuming a judiciously-chosen set of chiral supermultiplets, and a pattern of spontaneous symmetry breaking, we obtain the low-energy chiral fermions together with a spectrum of superheavy fermions at two different scales. The latter mediate Froggatt-Nielsen tree graphs that give rise to a phenomenologically viable effective quark mass matrix texture. The model is the first example of a nontrivial combination of supersymmetry without R-parity, gauged nonabelian horizontal symmetry and unification/anti-unification. It is expected to have some very interesting features in SUSY-GUT phenomenology.
|
hep-ph/0701190
|
Michihisa Takeuchi
|
Mihoko M. Nojiri and Michihisa Takeuchi
|
The study of sq_L sq_L production at LHC in the l^\pm l^\pm channel and
sensitivity to other models
|
40 pages, 24 figures, added references, typos added
|
Phys.Rev.D76:015009,2007
|
10.1103/PhysRevD.76.015009
|
KEK-TH-1134, YITP-07-03
|
hep-ph
| null |
$\tilde{q}_L \tilde{q}_L$ production is one of the main SUSY production
processes in the MSSM, which occurs due to the chirality flip caused by the
Majorana gluino mass. This process is one of the sources of same sign two
lepton (SS2$l$) events, however, gluino production also contributes to this
channel. In this paper, we develop a method to identify gluino and squark
production separately in the SS2$l$ channel, based on cuts on the kinematical
configuration of the jets. We applied the method to the MSSM, a model with an
extended gluino sector, and the Littlest Higgs model with T-parity (LHT), and
found a distinctive difference between these models when considering the
numbers of SS2$l$ events selected by the cuts.
|
[
{
"created": "Tue, 23 Jan 2007 19:34:39 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2007 01:27:11 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Apr 2007 08:27:36 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Nojiri",
"Mihoko M.",
""
],
[
"Takeuchi",
"Michihisa",
""
]
] |
$\tilde{q}_L \tilde{q}_L$ production is one of the main SUSY production processes in the MSSM, which occurs due to the chirality flip caused by the Majorana gluino mass. This process is one of the sources of same sign two lepton (SS2$l$) events, however, gluino production also contributes to this channel. In this paper, we develop a method to identify gluino and squark production separately in the SS2$l$ channel, based on cuts on the kinematical configuration of the jets. We applied the method to the MSSM, a model with an extended gluino sector, and the Littlest Higgs model with T-parity (LHT), and found a distinctive difference between these models when considering the numbers of SS2$l$ events selected by the cuts.
|
hep-ph/9407291
| null |
Ian Jack, D. R. Timothy Jones, Stephen P. Martin, Michael T. Vaughn
and Youichi Yamada
|
Decoupling of the $\epsilon$-scalar mass in softly broken supersymmetry
|
7 pages, LTH-336, NUB-3094-94TH, KEK-TH-404
|
Phys.Rev.D50:5481-5483,1994
|
10.1103/PhysRevD.50.R5481
| null |
hep-ph
| null |
It has been shown recently that the introduction of an unphysical
$\epsilon$-scalar mass $\tilde{m}$ is necessary for the proper renormalization
of softly broken supersymmetric theories by dimensional reduction ($\drbar$).
In these theories, both the two-loop $\beta$-functions of the scalar masses and
their one-loop finite corrections depend on $\tilde{m}^2$. We find, however,
that the dependence on $\tilde{m}^2$ can be completely removed by slightly
modifying the \drbar renormalization scheme. We also show that previous \drbar
calculations of one-loop corrections in supersymmetry which ignored the
$\tilde{m}^2$ contribution correspond to using this modified scheme.
|
[
{
"created": "Thu, 14 Jul 1994 14:06:12 GMT",
"version": "v1"
}
] |
2009-12-30
|
[
[
"Jack",
"Ian",
""
],
[
"Jones",
"D. R. Timothy",
""
],
[
"Martin",
"Stephen P.",
""
],
[
"Vaughn",
"Michael T.",
""
],
[
"Yamada",
"Youichi",
""
]
] |
It has been shown recently that the introduction of an unphysical $\epsilon$-scalar mass $\tilde{m}$ is necessary for the proper renormalization of softly broken supersymmetric theories by dimensional reduction ($\drbar$). In these theories, both the two-loop $\beta$-functions of the scalar masses and their one-loop finite corrections depend on $\tilde{m}^2$. We find, however, that the dependence on $\tilde{m}^2$ can be completely removed by slightly modifying the \drbar renormalization scheme. We also show that previous \drbar calculations of one-loop corrections in supersymmetry which ignored the $\tilde{m}^2$ contribution correspond to using this modified scheme.
|
2312.12770
|
Wen-Xuan Zhang
|
Wen-Xuan Zhang, Chang-Le Liu and Duojie Jia
|
Study of the hidden-heavy pentaquarks and $P_{cs}$ states
|
14 pages, 11 tables, 1 figure and two appendices, created by RevTex 4
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
In light of the recently observed resonance states $P_{\psi
s}^{\Lambda}(4338)^0$ and $P_{cs}(4459)^0$ by LHCb Collaboration in
$J/\psi\Lambda$ decay channel, we perform a systematical study of all possible
hidden-heavy pentaquarks with strangeness $S=0,-1,-2,-3$, in unified framework
of MIT bag model. The color-spin wavefunctions presented in terms of
Young-Yamanouchi bases and transformed into baryon-meson couplings, are
utilized to calculate masses, magnetic moments and ratios of partial widths.
With numerical analysis, the observed $P_{\psi s}^{\Lambda}(4338)^0$ is likely
to be a $1/2^-$ compact $P_{cs}$ pentaquark, and $P_{cs}(4459)^0$ favors
two-peak structure of $3/2^-$ and $1/2^-$ $P_{cs}$ states. Further predictions
on hadron properties and decay channels are given to compact $P_{css}$,
$P_{csss}$ states and bottom sectors.
|
[
{
"created": "Wed, 20 Dec 2023 05:14:01 GMT",
"version": "v1"
}
] |
2023-12-21
|
[
[
"Zhang",
"Wen-Xuan",
""
],
[
"Liu",
"Chang-Le",
""
],
[
"Jia",
"Duojie",
""
]
] |
In light of the recently observed resonance states $P_{\psi s}^{\Lambda}(4338)^0$ and $P_{cs}(4459)^0$ by LHCb Collaboration in $J/\psi\Lambda$ decay channel, we perform a systematical study of all possible hidden-heavy pentaquarks with strangeness $S=0,-1,-2,-3$, in unified framework of MIT bag model. The color-spin wavefunctions presented in terms of Young-Yamanouchi bases and transformed into baryon-meson couplings, are utilized to calculate masses, magnetic moments and ratios of partial widths. With numerical analysis, the observed $P_{\psi s}^{\Lambda}(4338)^0$ is likely to be a $1/2^-$ compact $P_{cs}$ pentaquark, and $P_{cs}(4459)^0$ favors two-peak structure of $3/2^-$ and $1/2^-$ $P_{cs}$ states. Further predictions on hadron properties and decay channels are given to compact $P_{css}$, $P_{csss}$ states and bottom sectors.
|
hep-ph/0212158
|
Joaquim Matias
|
Thorsten Feldmann (RWTH Aachen) and Joaquim Matias (UA Barcelona)
|
Forward-backward and isospin asymmetry for B -> K* l+ l- decay in the
standard model and in supersymmetry
|
21 pages, LaTeX with 6 figures, added references
|
JHEP 0301:074,2003
|
10.1088/1126-6708/2003/01/074
|
PITHA 02/20, UAB-FT-536
|
hep-ph
| null |
We discuss two dedicated observables in exclusive B -> K* l+ l- decay that
can be used to study effects of physics beyond the standard model, namely the
forward-backward asymmetry in the lepton spectrum and the isospin-asymmetry
between decays of charged and neutral B mesons. We consider the region of large
recoil-energy (i.e. small invariant mass of the lepton pair), and employ the
QCD factorization approach to exclusive B meson decays. Sub-leading effects in
the heavy quark mass expansion have been taken into account for the calculation
of the isospin-asymmetry. We give predictions for decay asymmetries in the
standard model, and its supersymmetric extension with minimal flavor violation,
using parameter values allowed by current experimental constraints on B->X_s
gamma decay.
|
[
{
"created": "Wed, 11 Dec 2002 16:05:40 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2002 11:34:43 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Feldmann",
"Thorsten",
"",
"RWTH Aachen"
],
[
"Matias",
"Joaquim",
"",
"UA Barcelona"
]
] |
We discuss two dedicated observables in exclusive B -> K* l+ l- decay that can be used to study effects of physics beyond the standard model, namely the forward-backward asymmetry in the lepton spectrum and the isospin-asymmetry between decays of charged and neutral B mesons. We consider the region of large recoil-energy (i.e. small invariant mass of the lepton pair), and employ the QCD factorization approach to exclusive B meson decays. Sub-leading effects in the heavy quark mass expansion have been taken into account for the calculation of the isospin-asymmetry. We give predictions for decay asymmetries in the standard model, and its supersymmetric extension with minimal flavor violation, using parameter values allowed by current experimental constraints on B->X_s gamma decay.
|
1709.05565
|
Guillermo Ballesteros
|
Guillermo Ballesteros, Marco Taoso
|
Primordial black hole dark matter from single field inflation
|
minor changes, references added, to appear in PRD
|
Phys. Rev. D 97, 023501 (2018)
|
10.1103/PhysRevD.97.023501
| null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a model of inflation capable of generating a population of light
black holes (about $10^{-16}$ - $10^{-14}$ solar masses) that might account for
a significant fraction of the dark matter in the Universe. The effective
potential of the model features an approximate inflection point arising from
two-loop order logarithmic corrections in well-motivated and perturbative
particle physics examples. This feature decelerates the inflaton before the end
of inflation, enhancing the primordial spectrum of scalar fluctuations and
triggering efficient black hole production with a peaked mass distribution. At
larger field values, inflation occurs thanks to a generic small coupling
between the inflaton and the curvature of spacetime. We compute accurately the
peak mass and abundance of the primordial black holes using the Press-Schechter
and Mukhanov-Sasaki formalisms, showing that the slow-roll approximation fails
to reproduce the correct results by orders of magnitude. We study as well a
qualitatively similar implementation of the idea, where the approximate
inflection point is due to competing terms in a generic polynomial potential.
In both models, requiring a significant part of the dark matter abundance to be
in the form of black holes implies a small blue scalar tilt with a sizable
negative running and a tensor spectrum that may be detected by the
next-generation probes of the cosmic microwave background. We also comment on
previous works on the topic.
|
[
{
"created": "Sat, 16 Sep 2017 21:16:20 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2017 17:50:50 GMT",
"version": "v2"
}
] |
2018-01-10
|
[
[
"Ballesteros",
"Guillermo",
""
],
[
"Taoso",
"Marco",
""
]
] |
We propose a model of inflation capable of generating a population of light black holes (about $10^{-16}$ - $10^{-14}$ solar masses) that might account for a significant fraction of the dark matter in the Universe. The effective potential of the model features an approximate inflection point arising from two-loop order logarithmic corrections in well-motivated and perturbative particle physics examples. This feature decelerates the inflaton before the end of inflation, enhancing the primordial spectrum of scalar fluctuations and triggering efficient black hole production with a peaked mass distribution. At larger field values, inflation occurs thanks to a generic small coupling between the inflaton and the curvature of spacetime. We compute accurately the peak mass and abundance of the primordial black holes using the Press-Schechter and Mukhanov-Sasaki formalisms, showing that the slow-roll approximation fails to reproduce the correct results by orders of magnitude. We study as well a qualitatively similar implementation of the idea, where the approximate inflection point is due to competing terms in a generic polynomial potential. In both models, requiring a significant part of the dark matter abundance to be in the form of black holes implies a small blue scalar tilt with a sizable negative running and a tensor spectrum that may be detected by the next-generation probes of the cosmic microwave background. We also comment on previous works on the topic.
|
1311.7017
|
Aurore Courtoy
|
A. Courtoy
|
Phenomenology of $\alpha_s$ at intermediate energy: the quark-hadron
duality approach
|
To appear in the proceedings of the workshop "QCD-TNT-III: From
quarks and gluons to hadronic matter: A bridge too far?", ECT*, Trento,
September 2-6 2013. Includes PoS.cls
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this contribution to the proceedings, we analyze the transition from
perturbative and non- perturbative QCD embedded in the coupling constant. In
the study of quark-hadron duality, we suggest that the realization of the
latter is related to the inclusion of non-perturbative effects at the level of
the coupling constant. The outcome of our analysis is a smooth transition from
perturba- tive to non-pertuperturbative QCD physics, embodied in the running of
the coupling constant at intermediate scales. While our approach is purely
perturbative, we compare our result to various non-perturbative schemes.
|
[
{
"created": "Wed, 27 Nov 2013 15:50:23 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Dec 2013 17:22:04 GMT",
"version": "v2"
}
] |
2013-12-04
|
[
[
"Courtoy",
"A.",
""
]
] |
In this contribution to the proceedings, we analyze the transition from perturbative and non- perturbative QCD embedded in the coupling constant. In the study of quark-hadron duality, we suggest that the realization of the latter is related to the inclusion of non-perturbative effects at the level of the coupling constant. The outcome of our analysis is a smooth transition from perturba- tive to non-pertuperturbative QCD physics, embodied in the running of the coupling constant at intermediate scales. While our approach is purely perturbative, we compare our result to various non-perturbative schemes.
|
hep-ph/9302235
| null |
Stephen D.H. Hsu
|
Complementarity and Chiral Fermions in SU(2) gauge Theories
|
10 pages, HUTP-92-A047, 2 figures not included
|
Phys.Rev. D48 (1993) 4458-4462
|
10.1103/PhysRevD.48.4458
| null |
hep-ph hep-lat
| null |
Complementarity - the absence of a phase boundary separating the Higgs and
confinement phases of a gauge theory - can be violated by the addition of
chiral fermions. We utilize chiral symmetry violating fermion correlators such
as $ \langle \bps \psi \rangle $ as order parameters to investigate this issue.
Using inequalities similar to those of Vafa-Witten and Weingarten, we show that
SU(2) gauge theories with Higgs and fermion fields in the fundamental
representation exhibit chiral symmetry breaking in the confined phase and
therefore do {\it not} lead to massless composite fermions. We discuss the
implications for the Abbott-Farhi strongly interacting standard model.
|
[
{
"created": "Mon, 8 Feb 1993 19:59:09 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Hsu",
"Stephen D. H.",
""
]
] |
Complementarity - the absence of a phase boundary separating the Higgs and confinement phases of a gauge theory - can be violated by the addition of chiral fermions. We utilize chiral symmetry violating fermion correlators such as $ \langle \bps \psi \rangle $ as order parameters to investigate this issue. Using inequalities similar to those of Vafa-Witten and Weingarten, we show that SU(2) gauge theories with Higgs and fermion fields in the fundamental representation exhibit chiral symmetry breaking in the confined phase and therefore do {\it not} lead to massless composite fermions. We discuss the implications for the Abbott-Farhi strongly interacting standard model.
|
hep-ph/0211385
|
Stefan Antusch
|
Stefan Antusch, Joern Kersten, Manfred Lindner, Michael Ratz
|
Dynamical Electroweak Symmetry Breaking by a Neutrino Condensate
|
18 pages, 8 figures; minor clarifications; version to appear in Nucl.
Phys. B
|
Nucl.Phys. B658 (2003) 203-216
|
10.1016/S0550-3213(03)00188-3
|
TUM-HEP-491/02, DESY 02-208
|
hep-ph
| null |
We show that the electroweak symmetry can be broken in a natural and
phenomenologically acceptable way by a neutrino condensate. Therefore, we
assume as particle content only the chiral fermions and gauge bosons of the
Standard Model and in addition right-handed neutrinos. A fundamental Higgs
field is absent. We assume instead that new interactions exist that can
effectively be described as four-fermion interactions and that can become
critical in the neutrino sector. We discuss in detail the coupled
Dirac-Majorana gap equations which lead to a neutrino condensate, electroweak
symmetry breaking and via the dynamical see-saw mechanism to small neutrino
masses. We show that the effective Lagrangian is that of the Standard Model
with massive neutrinos and with a composite Higgs particle. The mass
predictions are consistent with data.
|
[
{
"created": "Mon, 25 Nov 2002 13:48:11 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2003 11:14:07 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Antusch",
"Stefan",
""
],
[
"Kersten",
"Joern",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Ratz",
"Michael",
""
]
] |
We show that the electroweak symmetry can be broken in a natural and phenomenologically acceptable way by a neutrino condensate. Therefore, we assume as particle content only the chiral fermions and gauge bosons of the Standard Model and in addition right-handed neutrinos. A fundamental Higgs field is absent. We assume instead that new interactions exist that can effectively be described as four-fermion interactions and that can become critical in the neutrino sector. We discuss in detail the coupled Dirac-Majorana gap equations which lead to a neutrino condensate, electroweak symmetry breaking and via the dynamical see-saw mechanism to small neutrino masses. We show that the effective Lagrangian is that of the Standard Model with massive neutrinos and with a composite Higgs particle. The mass predictions are consistent with data.
|
1503.03484
|
Srimoyee Sen
|
Srimoyee Sen
|
Anisotropic Propagator for the Goldstone Modes in Color-flavor Locked
Phase in the Presence of a Magnetic Field
|
3 figures
|
Phys. Rev. D 92, 025004 (2015)
|
10.1103/PhysRevD.92.025004
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the phase diagram of QCD at very high baryon density and at zero
temperature in the presence of a strong magnetic field. The state of matter at
such high densities and low temperatures is believed to be a phase known as the
color-flavor locked phase which breaks color and electromagnetic gauge
invariance leaving a linear combination of them unbroken. Of the 9 quarks
(three flavors and three colors), five are neutral under this unbroken
generator and four are oppositely charged. In the presence of a magnetic field
corresponding to the unbroken generator however, the properties of the
condensate changes and a new phase known as the magnetic color flavor locked
(MCFL)phase is realized. This phase breaks some of the color-flavor symmetry of
the Lagrangian spontaneously, giving rise to 6 Goldstone modes, 5 of which are
pseudo Goldstone modes. These Goldstone modes are composed of excitations that
correspond to both neutral quarks and charged quarks. Hence it is natural to
expect that the propagators of these Goldstone modes get affected in the
presence of a magnetic field and their speed becomes considerably anisotropic.
Although this anisotropy is self-evident from symmetry arguments, it has not
been quantified yet. We calculate this anisotropy in the speed of the Goldstone
modes using an NJL model type of interaction between the quarks and comment on
the impact of such anisotropic modes on the transport properties of the MCFL
phase.
|
[
{
"created": "Wed, 11 Mar 2015 20:00:13 GMT",
"version": "v1"
}
] |
2015-07-08
|
[
[
"Sen",
"Srimoyee",
""
]
] |
We consider the phase diagram of QCD at very high baryon density and at zero temperature in the presence of a strong magnetic field. The state of matter at such high densities and low temperatures is believed to be a phase known as the color-flavor locked phase which breaks color and electromagnetic gauge invariance leaving a linear combination of them unbroken. Of the 9 quarks (three flavors and three colors), five are neutral under this unbroken generator and four are oppositely charged. In the presence of a magnetic field corresponding to the unbroken generator however, the properties of the condensate changes and a new phase known as the magnetic color flavor locked (MCFL)phase is realized. This phase breaks some of the color-flavor symmetry of the Lagrangian spontaneously, giving rise to 6 Goldstone modes, 5 of which are pseudo Goldstone modes. These Goldstone modes are composed of excitations that correspond to both neutral quarks and charged quarks. Hence it is natural to expect that the propagators of these Goldstone modes get affected in the presence of a magnetic field and their speed becomes considerably anisotropic. Although this anisotropy is self-evident from symmetry arguments, it has not been quantified yet. We calculate this anisotropy in the speed of the Goldstone modes using an NJL model type of interaction between the quarks and comment on the impact of such anisotropic modes on the transport properties of the MCFL phase.
|
1709.02397
|
Stephen P. Martin
|
Stephen P. Martin
|
Effective potential at three loops
|
48 pages, 8 ancillary files
|
Phys. Rev. D 96, 096005 (2017)
|
10.1103/PhysRevD.96.096005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present the effective potential at three-loop order for a general
renormalizable theory, using the \MSbar renormalization scheme and Landau gauge
fixing. As applications and illustrative points of reference, the results are
specialized to the supersymmetric Wess-Zumino model and to the Standard Model.
In each case, renormalization group scale invariance provides a consistency
check. In the Wess-Zumino model, the required vanishing of the minimum vacuum
energy yields an additional check. For the Standard Model, I carry out the
resummation of Goldstone boson contributions, which provides yet more
opportunities for non-trivial checks, and obtain the minimization condition for
the Higgs vacuum expectation value at full three-loop order. An infrared
divergence due to doubled photon propagators appears in the three-loop Standard
Model effective potential, but it does not affect the minimization condition or
physical observables and can be eliminated by resummation.
|
[
{
"created": "Thu, 7 Sep 2017 18:12:51 GMT",
"version": "v1"
}
] |
2017-11-22
|
[
[
"Martin",
"Stephen P.",
""
]
] |
I present the effective potential at three-loop order for a general renormalizable theory, using the \MSbar renormalization scheme and Landau gauge fixing. As applications and illustrative points of reference, the results are specialized to the supersymmetric Wess-Zumino model and to the Standard Model. In each case, renormalization group scale invariance provides a consistency check. In the Wess-Zumino model, the required vanishing of the minimum vacuum energy yields an additional check. For the Standard Model, I carry out the resummation of Goldstone boson contributions, which provides yet more opportunities for non-trivial checks, and obtain the minimization condition for the Higgs vacuum expectation value at full three-loop order. An infrared divergence due to doubled photon propagators appears in the three-loop Standard Model effective potential, but it does not affect the minimization condition or physical observables and can be eliminated by resummation.
|
hep-ph/0004132
|
Patrik Eden
|
Patrik Eden (NORDITA)
|
On Energy Conservation in Lund String Fragmentation
|
14 pages, 4 ps figures
|
JHEP 0005 (2000) 029
|
10.1088/1126-6708/2000/05/029
|
NORDITA 2000/36 HE
|
hep-ph
| null |
I discuss a Monte Carlo algorithm for hadronization in the Lund string
fragmentation picture, which conserves energy and momentum exactly as is
proposed by the model. An embryo to this Monte Carlo is used to calculate the
total decay density of a string. This is found to reach its predicted
asymptotic behaviour already at a string energy of about six hadron masses.
|
[
{
"created": "Fri, 14 Apr 2000 09:00:16 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Eden",
"Patrik",
"",
"NORDITA"
]
] |
I discuss a Monte Carlo algorithm for hadronization in the Lund string fragmentation picture, which conserves energy and momentum exactly as is proposed by the model. An embryo to this Monte Carlo is used to calculate the total decay density of a string. This is found to reach its predicted asymptotic behaviour already at a string energy of about six hadron masses.
|
0711.3193
|
Shaouly Bar-Shalom
|
Shaouly Bar-Shalom, Arvind Rajaraman
|
Models and Phenomenology of Maximal Flavor Violation
|
Latex, 4 pages, 1 figure. Version as published
|
Phys.Rev.D77:095011,2008
|
10.1103/PhysRevD.77.095011
| null |
hep-ph
| null |
We consider models of maximal flavor violation (MxFV), in which a new scalar
mediates large q_3 <-> q_1 or q_3 <-> q_2 flavor changing transitions (q_i is
an i'th generation quark), while q_3 <-> q_3 transitions are suppressed, e.g.,
\xi_{31}, \xi_{13} ~ V_{tb} and \xi_{33} ~ V_{td}, where \xi_{ij} are the new
scalar couplings to quarks and V is the CKM matrix. We show that, contrary to
the conventional viewpoint, such models are not ruled out by the existing low
energy data on K^0, B^0 and D^0 oscillations and rare K and B-decays. We also
show that these models of MxFV can have surprising new signatures at the LHC
and the Tevatron.
|
[
{
"created": "Tue, 20 Nov 2007 19:31:35 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2008 23:06:16 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bar-Shalom",
"Shaouly",
""
],
[
"Rajaraman",
"Arvind",
""
]
] |
We consider models of maximal flavor violation (MxFV), in which a new scalar mediates large q_3 <-> q_1 or q_3 <-> q_2 flavor changing transitions (q_i is an i'th generation quark), while q_3 <-> q_3 transitions are suppressed, e.g., \xi_{31}, \xi_{13} ~ V_{tb} and \xi_{33} ~ V_{td}, where \xi_{ij} are the new scalar couplings to quarks and V is the CKM matrix. We show that, contrary to the conventional viewpoint, such models are not ruled out by the existing low energy data on K^0, B^0 and D^0 oscillations and rare K and B-decays. We also show that these models of MxFV can have surprising new signatures at the LHC and the Tevatron.
|
1911.09726
|
Valentin V. Khoze
|
Valentin V. Khoze, Frank Krauss, Matthias Schott
|
Large Effects from Small QCD Instantons: Making Soft Bombs at Hadron
Colliders
|
v2 a few comments added & corrected typos. 30 pages, 11 figures. v3:
corrected a typo in (2.47), updated several figures and tables
| null |
10.1007/JHEP04(2020)201
|
IPPP/19/85
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is a common belief that the last missing piece of the Standard Model of
particles physics was found with the discovery of the Higgs boson at the Large
Hadron Collider. However, there remains a major prediction of quantum
tunnelling processes mediated by instanton solutions in the Yang-Mills theory,
that is still untested in the Standard Model. The direct experimental
observation of instanton-induced processes, which are a consequence of the
non-trivial vacuum structure of the Standard Model and of quantum tunnelling in
QFT, would be a major breakthrough in modern particle physics. In this paper,
we present for the first time a full calculation of QCD instanton-induced
processes in proton-proton collisions accounting for quantum corrections due to
both initial and final state gluon interactions, a first implementation in an
MC event generator as well as a basic strategy how to observe these effects
experimentally.
|
[
{
"created": "Thu, 21 Nov 2019 19:51:58 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Apr 2020 13:02:39 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jun 2020 17:26:48 GMT",
"version": "v3"
}
] |
2020-06-18
|
[
[
"Khoze",
"Valentin V.",
""
],
[
"Krauss",
"Frank",
""
],
[
"Schott",
"Matthias",
""
]
] |
It is a common belief that the last missing piece of the Standard Model of particles physics was found with the discovery of the Higgs boson at the Large Hadron Collider. However, there remains a major prediction of quantum tunnelling processes mediated by instanton solutions in the Yang-Mills theory, that is still untested in the Standard Model. The direct experimental observation of instanton-induced processes, which are a consequence of the non-trivial vacuum structure of the Standard Model and of quantum tunnelling in QFT, would be a major breakthrough in modern particle physics. In this paper, we present for the first time a full calculation of QCD instanton-induced processes in proton-proton collisions accounting for quantum corrections due to both initial and final state gluon interactions, a first implementation in an MC event generator as well as a basic strategy how to observe these effects experimentally.
|
1712.05089
|
Andrew Fowlie Dr.
|
Andrew Fowlie
|
DAMPE squib? Significance of the 1.4 TeV DAMPE excess
|
4 pages, 2 figures
|
Phys.Lett. B780 (2018) 181-184
|
10.1016/j.physletb.2018.03.006
|
CoEPP-MN-17-22
|
hep-ph physics.data-an
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a Bayesian and frequentist analysis of the DAMPE charged cosmic
ray spectrum. The spectrum, by eye, contained a spectral break at about 1 TeV
and a monochromatic excess at about 1.4 TeV. The break was supported by a Bayes
factor of about $10^{10}$ and we argue that the statistical significance was
resounding. We investigated whether we should attribute the excess to dark
matter annihilation into electrons in a nearby subhalo. We found a local
significance of about $3.6\sigma$ and a global significance of about
$2.3\sigma$, including a two-dimensional look-elsewhere effect by simulating
1000 pseudo-experiments. The Bayes factor was sensitive to our choices of
priors, but favoured the excess by about 2 for our choices. Thus, whilst
intriguing, the evidence for a signal is not currently compelling.
|
[
{
"created": "Thu, 14 Dec 2017 04:15:21 GMT",
"version": "v1"
}
] |
2018-03-13
|
[
[
"Fowlie",
"Andrew",
""
]
] |
We present a Bayesian and frequentist analysis of the DAMPE charged cosmic ray spectrum. The spectrum, by eye, contained a spectral break at about 1 TeV and a monochromatic excess at about 1.4 TeV. The break was supported by a Bayes factor of about $10^{10}$ and we argue that the statistical significance was resounding. We investigated whether we should attribute the excess to dark matter annihilation into electrons in a nearby subhalo. We found a local significance of about $3.6\sigma$ and a global significance of about $2.3\sigma$, including a two-dimensional look-elsewhere effect by simulating 1000 pseudo-experiments. The Bayes factor was sensitive to our choices of priors, but favoured the excess by about 2 for our choices. Thus, whilst intriguing, the evidence for a signal is not currently compelling.
|
1203.6823
|
C. Boehm
|
Jonathan H Davis, Celine Boehm, Niels Oppermann, Torsten Ensslin and
Thomas Lacroix
|
The XENON100 exclusion limit without considering Leff as a nuisance
parameter
|
10 pages;, 9 figures; references added
| null |
10.1103/PhysRevD.86.015027
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In 2011, the XENON100 experiment has set unprecedented constraints on dark
matter-nucleon interactions, excluding dark matter candidates with masses down
to 6 GeV if the corresponding cross section is larger than 10^{-39} cm^2. The
dependence of the exclusion limit in terms of the scintillation efficiency
(Leff) has been debated at length. To overcome possible criticisms XENON100
performed an analysis in which Leff was considered as a nuisance parameter and
its uncertainties were profiled out by using a Gaussian likelihood in which the
mean value corresponds to the best fit Leff value smoothly extrapolated to zero
below 3 keVnr. Although such a method seems fairly robust, it does not account
for more extreme types of extrapolation nor does it enable to anticipate on how
much the exclusion limit would vary if new data were to support a flat
behaviour for Leff below 3 keVnr, for example. Yet, such a question is crucial
for light dark matter models which are close to the published XENON100 limit.
To answer this issue, we use a maximum Likelihood ratio analysis, as done by
the XENON100 collaboration, but do not consider Leff as a nuisance parameter.
Instead, Leff is obtained directly from the fits to the data. This enables us
to define frequentist confidence intervals by marginalising over Leff.
|
[
{
"created": "Fri, 30 Mar 2012 13:57:11 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Apr 2012 09:57:41 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Davis",
"Jonathan H",
""
],
[
"Boehm",
"Celine",
""
],
[
"Oppermann",
"Niels",
""
],
[
"Ensslin",
"Torsten",
""
],
[
"Lacroix",
"Thomas",
""
]
] |
In 2011, the XENON100 experiment has set unprecedented constraints on dark matter-nucleon interactions, excluding dark matter candidates with masses down to 6 GeV if the corresponding cross section is larger than 10^{-39} cm^2. The dependence of the exclusion limit in terms of the scintillation efficiency (Leff) has been debated at length. To overcome possible criticisms XENON100 performed an analysis in which Leff was considered as a nuisance parameter and its uncertainties were profiled out by using a Gaussian likelihood in which the mean value corresponds to the best fit Leff value smoothly extrapolated to zero below 3 keVnr. Although such a method seems fairly robust, it does not account for more extreme types of extrapolation nor does it enable to anticipate on how much the exclusion limit would vary if new data were to support a flat behaviour for Leff below 3 keVnr, for example. Yet, such a question is crucial for light dark matter models which are close to the published XENON100 limit. To answer this issue, we use a maximum Likelihood ratio analysis, as done by the XENON100 collaboration, but do not consider Leff as a nuisance parameter. Instead, Leff is obtained directly from the fits to the data. This enables us to define frequentist confidence intervals by marginalising over Leff.
|
2107.07470
|
Michael Trott
|
Tyler Corbett, Adam Martin, Michael Trott
|
Consistent higher order $\sigma(\mathcal{G} \,\mathcal{G}\rightarrow
h)$, $\Gamma(h \rightarrow \mathcal{G} \,\mathcal{G})$ and $\Gamma(h
\rightarrow \gamma \gamma)$ in geoSMEFT
|
36pp 4 figures, v2, minor text changes, updated to JHEP version
|
JHEP12(2021)147
|
10.1007/JHEP12(2021)147
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We report consistent results for $\Gamma(h \rightarrow \gamma \gamma)$,
$\sigma(\mathcal{G} \,\mathcal{G}\rightarrow h)$ and $\Gamma(h \rightarrow
\mathcal{G} \,\mathcal{G})$ in the Standard Model Effective Field Theory
(SMEFT) perturbing the SM by corrections $\mathcal{O}(\bar{v}_T^2/16 \pi^2
\Lambda^2)$ in the Background Field Method (BFM) approach to gauge fixing, and
to $\mathcal{O}(\bar{v}_T^4/\Lambda^4)$ using the geometric formulation of the
SMEFT. We combine and modify recent results in the literature into a complete
set of consistent results, uniforming conventions, and simultaneously complete
the one loop results for these processes in the BFM. We emphasise calculational
scheme dependence present across these processes, and how the operator and loop
expansions are not independent beyond leading order. We illustrate several
cross checks of consistency in the results.
|
[
{
"created": "Thu, 15 Jul 2021 17:17:17 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Dec 2021 18:30:46 GMT",
"version": "v2"
}
] |
2022-01-03
|
[
[
"Corbett",
"Tyler",
""
],
[
"Martin",
"Adam",
""
],
[
"Trott",
"Michael",
""
]
] |
We report consistent results for $\Gamma(h \rightarrow \gamma \gamma)$, $\sigma(\mathcal{G} \,\mathcal{G}\rightarrow h)$ and $\Gamma(h \rightarrow \mathcal{G} \,\mathcal{G})$ in the Standard Model Effective Field Theory (SMEFT) perturbing the SM by corrections $\mathcal{O}(\bar{v}_T^2/16 \pi^2 \Lambda^2)$ in the Background Field Method (BFM) approach to gauge fixing, and to $\mathcal{O}(\bar{v}_T^4/\Lambda^4)$ using the geometric formulation of the SMEFT. We combine and modify recent results in the literature into a complete set of consistent results, uniforming conventions, and simultaneously complete the one loop results for these processes in the BFM. We emphasise calculational scheme dependence present across these processes, and how the operator and loop expansions are not independent beyond leading order. We illustrate several cross checks of consistency in the results.
|
2209.15521
|
Wei Tao
|
Wei Tao, Ruilin Zhu, Zhen-Jun Xiao
|
Next-to-next-to-leading order matching of beauty-charmed meson $B_{c}$
and $B^*_{c}$ decay constants
|
9 pages, 7 figures, 6 tables; the inputting values of LDMEs are
changed with new references and then the phenomenological results are also
updated; some comments added; several typos corrected
| null |
10.1103/PhysRevD.106.114037
| null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We present the next-to-next-to-leading order (NNLO) QCD corrections to the
decay constants for both the pseudoscalar and vector beauty-charmed mesons
$B_{c}$ and $B^*_{c}$ in nonrelativistic QCD effective theory. Explicit NNLO
calculation verified that the $B_c$ decay constant from pseudoscalar current is
identical with the $B_c$ decay constant from axial-vector current. The NNLO
result for the vector decay constant of $B^*_{c}$ meson is novel. Combined with
the latest extraction of nonrelativistic QCD long-distance matrix elements of
$B_c$ meson, we give the branching ratios of leptonic decays of $B_{c}$ and
$B^*_{c}$ mesons. In addition, the novel anomalous dimension for the
flavor-changing heavy quark vector current in nonrelativistic QCD effective
theory are helpful to investigate the threshold behaviours of two different
heavy quarks.
|
[
{
"created": "Fri, 30 Sep 2022 15:09:56 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2022 06:34:18 GMT",
"version": "v2"
}
] |
2023-01-11
|
[
[
"Tao",
"Wei",
""
],
[
"Zhu",
"Ruilin",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] |
We present the next-to-next-to-leading order (NNLO) QCD corrections to the decay constants for both the pseudoscalar and vector beauty-charmed mesons $B_{c}$ and $B^*_{c}$ in nonrelativistic QCD effective theory. Explicit NNLO calculation verified that the $B_c$ decay constant from pseudoscalar current is identical with the $B_c$ decay constant from axial-vector current. The NNLO result for the vector decay constant of $B^*_{c}$ meson is novel. Combined with the latest extraction of nonrelativistic QCD long-distance matrix elements of $B_c$ meson, we give the branching ratios of leptonic decays of $B_{c}$ and $B^*_{c}$ mesons. In addition, the novel anomalous dimension for the flavor-changing heavy quark vector current in nonrelativistic QCD effective theory are helpful to investigate the threshold behaviours of two different heavy quarks.
|
1804.07471
|
Yohei Ema
|
Yohei Ema, Kazunori Nakayama, Yong Tang
|
Production of Purely Gravitational Dark Matter
|
20 pages, 4 figures
| null |
10.1007/JHEP09(2018)135
|
UT-18-08, KEK-TH-2047
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the purely gravitational dark matter scenario, the dark matter particle
does not have any interaction except for gravitational one. We study the
gravitational particle production of dark matter particle in such a minimal
setup and show that correct amount of dark matter can be produced depending on
the inflation model and the dark matter mass. In particular, we carefully
evaluate the particle production rate from the transition epoch to the inflaton
oscillation epoch in a realistic inflation model and point out that the
gravitational particle production is efficient even if dark matter mass is much
larger than the Hubble scale during inflation as long as it is smaller than the
inflaton mass.
|
[
{
"created": "Fri, 20 Apr 2018 07:03:46 GMT",
"version": "v1"
}
] |
2018-10-17
|
[
[
"Ema",
"Yohei",
""
],
[
"Nakayama",
"Kazunori",
""
],
[
"Tang",
"Yong",
""
]
] |
In the purely gravitational dark matter scenario, the dark matter particle does not have any interaction except for gravitational one. We study the gravitational particle production of dark matter particle in such a minimal setup and show that correct amount of dark matter can be produced depending on the inflation model and the dark matter mass. In particular, we carefully evaluate the particle production rate from the transition epoch to the inflaton oscillation epoch in a realistic inflation model and point out that the gravitational particle production is efficient even if dark matter mass is much larger than the Hubble scale during inflation as long as it is smaller than the inflaton mass.
|
hep-ph/9603203
|
Junji Hisano
|
Ken-ichi Hikasa (Tohoku University), Junji Hisano (Tokyo Institute of
Technology)
|
Hard gluon emission from colored scalar pairs\break in e^+ e^-
annihilation
|
28 pages and 7 figures
|
Phys.Rev. D54 (1996) 1908-1918
|
10.1103/PhysRevD.54.1908
|
TU-497, TIT-HEP-308
|
hep-ph
| null |
We study QCD correction to the pair production of colored scalar particles in
electron-positron annihilation with an emphasis on gluon emission in the final
state. We discuss the usefulness of working in a ``quasi-two-body'' frame and
present the helicity amplitudes for the process. We compare the final state
configuration with fermion pair production and find that the three-jet fraction
for the scalars shows quantitative difference from that for fermions.
|
[
{
"created": "Fri, 1 Mar 1996 11:28:19 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Hikasa",
"Ken-ichi",
"",
"Tohoku University"
],
[
"Hisano",
"Junji",
"",
"Tokyo Institute of\n Technology"
]
] |
We study QCD correction to the pair production of colored scalar particles in electron-positron annihilation with an emphasis on gluon emission in the final state. We discuss the usefulness of working in a ``quasi-two-body'' frame and present the helicity amplitudes for the process. We compare the final state configuration with fermion pair production and find that the three-jet fraction for the scalars shows quantitative difference from that for fermions.
|
1712.00267
|
Xia Wan Dr.
|
Xia Wan, You-Kai Wang
|
Probe $CP$-violating $H\gamma\gamma$ coupling through interferometry
|
8 pages, 7 figures, to be published in Chinese Physics C
| null |
10.1088/1674-1137/43/7/073101
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The diphoton invariant mass distribution of interference between
$gg\to H \to \gamma\gamma$ and $gg\to \gamma\gamma$ is almost antisymmetric
around the Higgs mass $M_H$. We propose a new observable $A_{\text{int}}$ to
quantify this effect, which is a ratio of a sign-reversed integral around $M_H$
( e.g. $\int^{M_H}_{M_H-5~\mbox{GeV}} -\int_{M_H}^{M_H+5~\mbox{GeV}}$) and the
cross section of the Higgs signal. We study $A_{\text{int}}$ both in Standard
Model (SM) and new physics with various $CP$-violating $H\gamma\gamma$
couplings. The $A_{\text{int}}$ in SM could reach a value of $10\%$, while for
$CP$-violating $H\gamma\gamma$ couplings $A_{\text{int}}$ could range from
$10\%$ to $-10\%$, which is probable to be detected in HL-LHC experiment. The
$A_{\text{int}}$ with both $CP$-violating $H\gamma\gamma$ and $Hgg$ couplings
are also studied and its value range is further extended.
|
[
{
"created": "Fri, 1 Dec 2017 10:34:14 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Oct 2018 01:42:10 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Apr 2019 08:18:41 GMT",
"version": "v3"
}
] |
2019-09-04
|
[
[
"Wan",
"Xia",
""
],
[
"Wang",
"You-Kai",
""
]
] |
The diphoton invariant mass distribution of interference between $gg\to H \to \gamma\gamma$ and $gg\to \gamma\gamma$ is almost antisymmetric around the Higgs mass $M_H$. We propose a new observable $A_{\text{int}}$ to quantify this effect, which is a ratio of a sign-reversed integral around $M_H$ ( e.g. $\int^{M_H}_{M_H-5~\mbox{GeV}} -\int_{M_H}^{M_H+5~\mbox{GeV}}$) and the cross section of the Higgs signal. We study $A_{\text{int}}$ both in Standard Model (SM) and new physics with various $CP$-violating $H\gamma\gamma$ couplings. The $A_{\text{int}}$ in SM could reach a value of $10\%$, while for $CP$-violating $H\gamma\gamma$ couplings $A_{\text{int}}$ could range from $10\%$ to $-10\%$, which is probable to be detected in HL-LHC experiment. The $A_{\text{int}}$ with both $CP$-violating $H\gamma\gamma$ and $Hgg$ couplings are also studied and its value range is further extended.
|
0805.4071
|
T. Lappi
|
H. Kowalski, T. Lappi, C. Marquet and R. Venugopalan
|
Nuclear enhancement and suppression of diffractive structure functions
at high energies
|
12 pages, RevTeX4, 12 figures. V2: minor clarifications and typos
corrected, to be published in PRC
|
Phys.Rev.C78:045201,2008
|
10.1103/PhysRevC.78.045201
|
IPhT-T08/089
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute diffractive structure functions for both protons and nuclei in the
framework of Color Glass Condensate models with impact parameter dependence.
These models have previously been shown to provide good agreement with
inclusive F_2 measurements and exclusive vector meson measurements at HERA. For
nuclei, they provide good (parameter free) agreement with the inclusive F_2
data. We demonstrate good agreement of our computations with HERA measurements
on inclusive diffraction. We extend our analysis to nuclei and predict the
pattern of enhancement and suppression of the diffractive structures functions
that can be measured at an Electron Ion Collider. We discuss how the impact
parameter dependence crucially affects our analysis, in particular for large
invariant masses at fixed Q^2.
|
[
{
"created": "Tue, 27 May 2008 08:44:12 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2008 12:20:46 GMT",
"version": "v2"
}
] |
2009-01-14
|
[
[
"Kowalski",
"H.",
""
],
[
"Lappi",
"T.",
""
],
[
"Marquet",
"C.",
""
],
[
"Venugopalan",
"R.",
""
]
] |
We compute diffractive structure functions for both protons and nuclei in the framework of Color Glass Condensate models with impact parameter dependence. These models have previously been shown to provide good agreement with inclusive F_2 measurements and exclusive vector meson measurements at HERA. For nuclei, they provide good (parameter free) agreement with the inclusive F_2 data. We demonstrate good agreement of our computations with HERA measurements on inclusive diffraction. We extend our analysis to nuclei and predict the pattern of enhancement and suppression of the diffractive structures functions that can be measured at an Electron Ion Collider. We discuss how the impact parameter dependence crucially affects our analysis, in particular for large invariant masses at fixed Q^2.
|
0910.1336
|
Sung-Gi Kim
|
M. Ishiduki, S.-G. Kim, N. Maekawa and K. Sakurai
|
Spontaneous CP violation in E6 SUSY GUT with SU(2) flavor and anomalous
U(1) symmetries
|
20 pages, 1 figure, Eq(6.1) corrected
|
Phys.Rev.D80:115011,2009; Erratum-ibid.D81:039901,2010
|
10.1103/PhysRevD.80.115011 10.1103/PhysRevD.81.039901
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct a model of spontaneous CP violation in E6 supersymmetric grand
unified theory. In the model, we employ an SU(2)F flavor symmetry and an
anomalous U(1)A symmetry. The SU(2)F flavor symmetry is introduced to provide
the origin of hierarchical structures of Yukawa coupling and to ensure the
universality of sfermion soft masses. The anomalous U(1)A symmetry is
introduced to realize the doublet-triplet mass splitting, to provide the origin
of hierarchical structures of Yukawa couplings, and to solve the mu problem. In
the model, CP is spontaneously broken by the SU(2)F breaking in order to
provide a Kobayashi-Maskawa phase and to evade the supersymmetric CP problem.
However, a naive construction of the model generally leads to unwanted outcome,
Arg[mu b*]=O(1), when CP violating effects in the flavor sector are taken into
account. We cure this difficulty by imposing a discrete symmetry and find that
this prescription can play additional roles. It ensures that realistic up-quark
mass and Cabibbo angle are simultaneously realized without cancellation between
O(1) coefficients. Also, severe constraints from the chromo-electric dipole
moment of the quark can be satisfied without destabilizing the weak scale. The
discrete symmetry reduces the number of free parameters, but the model is
capable of reproducing quark and lepton mass spectra, mixing angles, and a
Jarlskog invariant. We obtain characteristic predictions Vub sim O(lambda^4)
(lambda=0.22) and |Vcb Yb| = |Yc| at the grand unified theory scale.
|
[
{
"created": "Wed, 7 Oct 2009 19:32:02 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2010 23:23:59 GMT",
"version": "v2"
},
{
"created": "Sun, 17 Jan 2010 04:33:06 GMT",
"version": "v3"
}
] |
2014-11-20
|
[
[
"Ishiduki",
"M.",
""
],
[
"Kim",
"S. -G.",
""
],
[
"Maekawa",
"N.",
""
],
[
"Sakurai",
"K.",
""
]
] |
We construct a model of spontaneous CP violation in E6 supersymmetric grand unified theory. In the model, we employ an SU(2)F flavor symmetry and an anomalous U(1)A symmetry. The SU(2)F flavor symmetry is introduced to provide the origin of hierarchical structures of Yukawa coupling and to ensure the universality of sfermion soft masses. The anomalous U(1)A symmetry is introduced to realize the doublet-triplet mass splitting, to provide the origin of hierarchical structures of Yukawa couplings, and to solve the mu problem. In the model, CP is spontaneously broken by the SU(2)F breaking in order to provide a Kobayashi-Maskawa phase and to evade the supersymmetric CP problem. However, a naive construction of the model generally leads to unwanted outcome, Arg[mu b*]=O(1), when CP violating effects in the flavor sector are taken into account. We cure this difficulty by imposing a discrete symmetry and find that this prescription can play additional roles. It ensures that realistic up-quark mass and Cabibbo angle are simultaneously realized without cancellation between O(1) coefficients. Also, severe constraints from the chromo-electric dipole moment of the quark can be satisfied without destabilizing the weak scale. The discrete symmetry reduces the number of free parameters, but the model is capable of reproducing quark and lepton mass spectra, mixing angles, and a Jarlskog invariant. We obtain characteristic predictions Vub sim O(lambda^4) (lambda=0.22) and |Vcb Yb| = |Yc| at the grand unified theory scale.
|
hep-ph/9812244
|
Amol Dighe
|
Amol Dighe, Sergio Pastor, Alexei Smirnov
|
The Physics of Relic Neutrinos
|
The report of the workshop on The Physics of Relic Neutrinos, held at
ICTP, Trieste during September 16 - 19, 1998
| null | null |
SISSA/EP/98/132
|
hep-ph
| null |
We report on the main results presented at the workshop on The Physics of
Relic Neutrinos. The study of relic neutrinos involves a broad spectrum of
problems in particle physics, astrophysics and cosmology. Features of
baryogenesis and leptogenesis could be imprinted in the properties of the relic
neutrino sea. Relic neutrinos played a crucial role in the big bang
nucleosynthesis. Being the hot component of the dark matter, they have
participated in the structure formation in the universe. Although the direct
detection of the sea seems impossible at this stage, there could be various
indirect manifestations of these neutrinos which would allow us to study the
properties of the sea both in the past and at the present epoch.
|
[
{
"created": "Thu, 3 Dec 1998 22:33:32 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dighe",
"Amol",
""
],
[
"Pastor",
"Sergio",
""
],
[
"Smirnov",
"Alexei",
""
]
] |
We report on the main results presented at the workshop on The Physics of Relic Neutrinos. The study of relic neutrinos involves a broad spectrum of problems in particle physics, astrophysics and cosmology. Features of baryogenesis and leptogenesis could be imprinted in the properties of the relic neutrino sea. Relic neutrinos played a crucial role in the big bang nucleosynthesis. Being the hot component of the dark matter, they have participated in the structure formation in the universe. Although the direct detection of the sea seems impossible at this stage, there could be various indirect manifestations of these neutrinos which would allow us to study the properties of the sea both in the past and at the present epoch.
|
1203.1359
|
Aoife Bharucha
|
Aoife Bharucha
|
Two-loop Corrections to the B to pi Form Factor from QCD Sum Rules on
the Light-Cone and |V(ub)|
|
18 pages, 3 figures
| null |
10.1007/JHEP05(2012)092
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the leading-twist O(alphas^2 beta0) corrections to the B to pi
transition form factor f+(0) in light-cone sum rules. We find that, as
expected, there is a cancellation between the O(alphas^2 beta0) corrections to
fB f+(0) and the large corresponding corrections to fB, calculated in QCD sum
rules. This suggests the insensitivity of the form factors calculated in the
light-cone sum rules approach to this source of radiative corrections. We
further obtain an improved determination of the CKM matrix element |V(ub)|,
using latest results from BaBar and Belle for f+(0)|V(ub)|.
|
[
{
"created": "Wed, 7 Mar 2012 00:45:32 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Bharucha",
"Aoife",
""
]
] |
We calculate the leading-twist O(alphas^2 beta0) corrections to the B to pi transition form factor f+(0) in light-cone sum rules. We find that, as expected, there is a cancellation between the O(alphas^2 beta0) corrections to fB f+(0) and the large corresponding corrections to fB, calculated in QCD sum rules. This suggests the insensitivity of the form factors calculated in the light-cone sum rules approach to this source of radiative corrections. We further obtain an improved determination of the CKM matrix element |V(ub)|, using latest results from BaBar and Belle for f+(0)|V(ub)|.
|
0806.2793
|
Antonio Pich
|
A. Pich
|
Tau Physics: Theory Overview
|
Invited talk at the 2008 International Workshop on e+e- collisions
from Phi to Psi (PhiPsi08, Frascati, Italy, 7-10 April 2008)
|
Nucl.Phys.Proc.Suppl.181-182:300-305,2008
|
10.1016/j.nuclphysbps.2008.09.054
|
IFIC/08-29, FTUV/08-0617
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The present status of some selected topics on tau physics is presented:
charged-current universality tests, bounds on lepton-flavour violation, the
determination of alpha_s from the inclusive tau hadronic width, the measurement
of |V_{us}| through the Cabibbo-suppressed decays of the tau, and the
theoretical description of the "tau -> nu_tau K pi" spectrum.
|
[
{
"created": "Tue, 17 Jun 2008 13:59:29 GMT",
"version": "v1"
}
] |
2008-11-07
|
[
[
"Pich",
"A.",
""
]
] |
The present status of some selected topics on tau physics is presented: charged-current universality tests, bounds on lepton-flavour violation, the determination of alpha_s from the inclusive tau hadronic width, the measurement of |V_{us}| through the Cabibbo-suppressed decays of the tau, and the theoretical description of the "tau -> nu_tau K pi" spectrum.
|
1901.05627
|
Jie Ren
|
Jie Ren, Lei Wu, Jin Min Yang
|
Unveiling CP property of top-Higgs coupling with graph neural networks
at the LHC
|
5 pages, 5 figures
| null |
10.1016/j.physletb.2020.135198
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The top-Higgs coupling plays an important role in particle physics and
cosmology. The precision measurements of this coupling can provide an insight
to new physics beyond the Standard Model. In this paper, we propose to use
Message Passing Neural Network (MPNN) to reveal the CP nature of top-Higgs
interaction through semi-leptonic channel $pp \to t(\to
b\ell^-\nu_\ell)\bar{t}(\to \bar{b}jj)h(\to b\bar{b})$. Using the test
statistics constructed from the event classification probabilities given by the
MPNN, we find that the pure CP-even and CP-odd components can be well
distinguished at the LHC, with at most 300 fb$^{-1}$ experimental data.
|
[
{
"created": "Thu, 17 Jan 2019 05:37:26 GMT",
"version": "v1"
}
] |
2020-01-08
|
[
[
"Ren",
"Jie",
""
],
[
"Wu",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
]
] |
The top-Higgs coupling plays an important role in particle physics and cosmology. The precision measurements of this coupling can provide an insight to new physics beyond the Standard Model. In this paper, we propose to use Message Passing Neural Network (MPNN) to reveal the CP nature of top-Higgs interaction through semi-leptonic channel $pp \to t(\to b\ell^-\nu_\ell)\bar{t}(\to \bar{b}jj)h(\to b\bar{b})$. Using the test statistics constructed from the event classification probabilities given by the MPNN, we find that the pure CP-even and CP-odd components can be well distinguished at the LHC, with at most 300 fb$^{-1}$ experimental data.
|
1509.04403
|
Bruno Werneck Mintz
|
Bruno W. Mintz
|
On an exactly solvable confining quark model and its thermodynamics
|
Proceedings of the XIII International Workshop on Hadron Physics -
XIII Hadron Physics. 6 pages. 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform an exact computation of the grand partition function of a model of
confined quarks at arbitrary temperatures and quark chemical potentials. The
model is inspired by a version of QCD where the perturbative BRST symmetry is
broken in the infrared, while perturbative QCD is recovered in the ultraviolet.
The theory leads, even at tree level, to a quark mass function compatible with
nonperturbative analyses of lattice simulations and Dyson-Schwinger equations.
In spite of being defined at tree level, the model produces a non-trivial and
stable thermodynamic behaviour at arbitrary values of temperature or chemical
potential. Results for the pressure and the trace anomaly as a function of
temperature qualitatively resemble those of non-perturbative interactions as
observed in lattice simulations. The cold and dense thermodynamics is also
contains non-trivial features, being unlike a gas of free massive particles.
|
[
{
"created": "Tue, 15 Sep 2015 05:24:37 GMT",
"version": "v1"
}
] |
2015-09-16
|
[
[
"Mintz",
"Bruno W.",
""
]
] |
We perform an exact computation of the grand partition function of a model of confined quarks at arbitrary temperatures and quark chemical potentials. The model is inspired by a version of QCD where the perturbative BRST symmetry is broken in the infrared, while perturbative QCD is recovered in the ultraviolet. The theory leads, even at tree level, to a quark mass function compatible with nonperturbative analyses of lattice simulations and Dyson-Schwinger equations. In spite of being defined at tree level, the model produces a non-trivial and stable thermodynamic behaviour at arbitrary values of temperature or chemical potential. Results for the pressure and the trace anomaly as a function of temperature qualitatively resemble those of non-perturbative interactions as observed in lattice simulations. The cold and dense thermodynamics is also contains non-trivial features, being unlike a gas of free massive particles.
|
hep-ph/9705209
|
Thomas G. Rizzo
|
T.G. Rizzo
|
$b \to s\ell^+\ell^-$ in the Left-Right Symmetric Model
|
6 pages, 2 figures
| null | null |
SLAC-PUB-7466
|
hep-ph
| null |
We begin to analyze and contrast the predictions for the decay $b\to
s\ell^+\ell^-$ in the Left-Right Symmetric Model(LRM) with those of the
Standard Model(SM). In particular, we show that the forward-backward asymmetry
of the lepton spectrum can be used to distinguish the SM from the simplest
manifestation of the LRM. [To appear in the Proceedings of the 2nd
International Conference on B Physics and CP Violation, Honolulu, HI, 24-27
March 1997]
|
[
{
"created": "Thu, 1 May 1997 21:02:47 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Rizzo",
"T. G.",
""
]
] |
We begin to analyze and contrast the predictions for the decay $b\to s\ell^+\ell^-$ in the Left-Right Symmetric Model(LRM) with those of the Standard Model(SM). In particular, we show that the forward-backward asymmetry of the lepton spectrum can be used to distinguish the SM from the simplest manifestation of the LRM. [To appear in the Proceedings of the 2nd International Conference on B Physics and CP Violation, Honolulu, HI, 24-27 March 1997]
|
1010.5827
|
Brian K. Heltsley
|
N. Brambilla, S. Eidelman, B. K. Heltsley, R. Vogt, G. T. Bodwin, E.
Eichten, A. D. Frawley, A. B. Meyer, R. E. Mitchell, V. Papadimitriou, P.
Petreczky, A. A. Petrov, P. Robbe, A. Vairo, A. Andronic, R. Arnaldi, P.
Artoisenet, G. Bali, A. Bertolin, D. Bettoni, J. Brodzicka, G. E. Bruno, A.
Caldwell, J. Catmore, C.-H. Chang, K.-T. Chao, E. Chudakov, P. Cortese, P.
Crochet, A. Drutskoy, U. Ellwanger, P. Faccioli, A. Gabareen Mokhtar, X.
Garcia i Tormo, C. Hanhart, F. A. Harris, D. M. Kaplan, S. R. Klein, H.
Kowalski, J.-P. Lansberg, E. Levichev, V. Lombardo, C. Lourenco, F. Maltoni,
A. Mocsy, R. Mussa, F. S. Navarra, M. Negrini, M. Nielsen, S. L. Olsen, P.
Pakhlov, G. Pakhlova, K. Peters, A. D. Polosa, W. Qian, J.-W. Qiu, G. Rong,
M. A. Sanchis-Lozano, E. Scomparin, P. Senger, F. Simon, S. Stracka, Y.
Sumino, M. Voloshin, C. Weiss, H. K. W\"ohri and C.-Z. Yuan
|
Heavy quarkonium: progress, puzzles, and opportunities
|
182 pages, 112 figures. Editors: N. Brambilla, S. Eidelman, B. K.
Heltsley, R. Vogt. Section Coordinators: G. T. Bodwin, E. Eichten, A. D.
Frawley, A. B. Meyer, R. E. Mitchell, V. Papadimitriou, P. Petreczky, A. A.
Petrov, P. Robbe, A. Vairo
|
Eur.Phys.J.C71:1534,2011
|
10.1140/epjc/s10052-010-1534-9
|
TUM-EFT 11/10, CLNS 10/2066, ANL-HEP-PR-10-44, Alberta Thy 11-10,
CP3-10-37, FZJ-IKP-TH-2010-24, INT-PUB-10-059
|
hep-ph hep-ex hep-lat hep-th nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A golden age for heavy quarkonium physics dawned a decade ago, initiated by
the confluence of exciting advances in quantum chromodynamics (QCD) and an
explosion of related experimental activity. The early years of this period were
chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in
2004, which presented a comprehensive review of the status of the field at that
time and provided specific recommendations for further progress. However, the
broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles
could only be partially anticipated. Since the release of the YR, the BESII
program concluded only to give birth to BESIII; the $B$-factories and CLEO-c
flourished; quarkonium production and polarization measurements at HERA and the
Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the
deconfinement regime. All these experiments leave legacies of quality,
precision, and unsolved mysteries for quarkonium physics, and therefore beg for
continuing investigations. The plethora of newly-found quarkonium-like states
unleashed a flood of theoretical investigations into new forms of matter such
as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the
spectroscopy, decays, production, and in-medium behavior of c\bar{c}, b\bar{b},
and b\bar{c} bound states have been shown to validate some theoretical
approaches to QCD and highlight lack of quantitative success for others. The
intriguing details of quarkonium suppression in heavy-ion collisions that have
emerged from RHIC have elevated the importance of separating hot- and
cold-nuclear-matter effects in quark-gluon plasma studies. This review
systematically addresses all these matters and concludes by prioritizing
directions for ongoing and future efforts.
|
[
{
"created": "Wed, 27 Oct 2010 23:38:05 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Dec 2010 17:01:44 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Feb 2011 17:58:05 GMT",
"version": "v3"
}
] |
2011-02-18
|
[
[
"Brambilla",
"N.",
""
],
[
"Eidelman",
"S.",
""
],
[
"Heltsley",
"B. K.",
""
],
[
"Vogt",
"R.",
""
],
[
"Bodwin",
"G. T.",
""
],
[
"Eichten",
"E.",
""
],
[
"Frawley",
"A. D.",
""
],
[
"Meyer",
"A. B.",
""
],
[
"Mitchell",
"R. E.",
""
],
[
"Papadimitriou",
"V.",
""
],
[
"Petreczky",
"P.",
""
],
[
"Petrov",
"A. A.",
""
],
[
"Robbe",
"P.",
""
],
[
"Vairo",
"A.",
""
],
[
"Andronic",
"A.",
""
],
[
"Arnaldi",
"R.",
""
],
[
"Artoisenet",
"P.",
""
],
[
"Bali",
"G.",
""
],
[
"Bertolin",
"A.",
""
],
[
"Bettoni",
"D.",
""
],
[
"Brodzicka",
"J.",
""
],
[
"Bruno",
"G. E.",
""
],
[
"Caldwell",
"A.",
""
],
[
"Catmore",
"J.",
""
],
[
"Chang",
"C. -H.",
""
],
[
"Chao",
"K. -T.",
""
],
[
"Chudakov",
"E.",
""
],
[
"Cortese",
"P.",
""
],
[
"Crochet",
"P.",
""
],
[
"Drutskoy",
"A.",
""
],
[
"Ellwanger",
"U.",
""
],
[
"Faccioli",
"P.",
""
],
[
"Mokhtar",
"A. Gabareen",
""
],
[
"Tormo",
"X. Garcia i",
""
],
[
"Hanhart",
"C.",
""
],
[
"Harris",
"F. A.",
""
],
[
"Kaplan",
"D. M.",
""
],
[
"Klein",
"S. R.",
""
],
[
"Kowalski",
"H.",
""
],
[
"Lansberg",
"J. -P.",
""
],
[
"Levichev",
"E.",
""
],
[
"Lombardo",
"V.",
""
],
[
"Lourenco",
"C.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Mocsy",
"A.",
""
],
[
"Mussa",
"R.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Negrini",
"M.",
""
],
[
"Nielsen",
"M.",
""
],
[
"Olsen",
"S. L.",
""
],
[
"Pakhlov",
"P.",
""
],
[
"Pakhlova",
"G.",
""
],
[
"Peters",
"K.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Qian",
"W.",
""
],
[
"Qiu",
"J. -W.",
""
],
[
"Rong",
"G.",
""
],
[
"Sanchis-Lozano",
"M. A.",
""
],
[
"Scomparin",
"E.",
""
],
[
"Senger",
"P.",
""
],
[
"Simon",
"F.",
""
],
[
"Stracka",
"S.",
""
],
[
"Sumino",
"Y.",
""
],
[
"Voloshin",
"M.",
""
],
[
"Weiss",
"C.",
""
],
[
"Wöhri",
"H. K.",
""
],
[
"Yuan",
"C. -Z.",
""
]
] |
A golden age for heavy quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the $B$-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations. The plethora of newly-found quarkonium-like states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of c\bar{c}, b\bar{b}, and b\bar{c} bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hot- and cold-nuclear-matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts.
|
1212.5372
|
Manami Hashi
|
Manami Hashi and Noriaki Kitazawa
|
Detectability of the second resonance of low-scale string models at the
LHC
|
12 pages, 12 figures
| null |
10.1007/JHEP03(2013)127
|
UT-Komaba/12-13
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Low-scale string models are phenomenological models in String Theory, in
which the string scale M_s is of the order of TeV. String excited states which
are characteristic modes in low-scale string models can be observed as
resonances in dijet invariant mass distributions at the LHC. If a new heavy
resonance is discovered at the LHC, it is important to investigate whether the
resonance comes from low-scale string models. In this work, two analyses are
performed: One is observing higher spin degeneracy of string excited states by
an angular distribution analysis on the resonance, since the string resonance
consists of several degenerate states with different spins. The other is
observing second string excited states by a search for a second resonance in
dijet invariant mass distributions, since second string excited states have
characteristic masses of sqrt{2} times of masses of first string excited
states. As the result of Monte Carlo simulations assuming the 14 TeV LHC, we
give required luminosities for 5 sigma confirmation in each analysis, in case
of M_s = 4.5, 4.75 and 5 TeV.
|
[
{
"created": "Fri, 21 Dec 2012 09:47:41 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Dec 2012 17:44:30 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Feb 2013 07:01:44 GMT",
"version": "v3"
}
] |
2015-06-12
|
[
[
"Hashi",
"Manami",
""
],
[
"Kitazawa",
"Noriaki",
""
]
] |
Low-scale string models are phenomenological models in String Theory, in which the string scale M_s is of the order of TeV. String excited states which are characteristic modes in low-scale string models can be observed as resonances in dijet invariant mass distributions at the LHC. If a new heavy resonance is discovered at the LHC, it is important to investigate whether the resonance comes from low-scale string models. In this work, two analyses are performed: One is observing higher spin degeneracy of string excited states by an angular distribution analysis on the resonance, since the string resonance consists of several degenerate states with different spins. The other is observing second string excited states by a search for a second resonance in dijet invariant mass distributions, since second string excited states have characteristic masses of sqrt{2} times of masses of first string excited states. As the result of Monte Carlo simulations assuming the 14 TeV LHC, we give required luminosities for 5 sigma confirmation in each analysis, in case of M_s = 4.5, 4.75 and 5 TeV.
|
hep-ph/0612154
|
Matthias Jamin
|
Elvira Gamiz, Matthias Jamin, Antonio Pich, Joaquim Prades, Felix
Schwab
|
|V_us| and m_s from hadronic tau decays
|
5 pages. Invited talk presented by M.J. at Tau06, 19-22 September
2006, Pisa, Italy
|
Nucl.Phys.Proc.Suppl.169:85-89,2007
|
10.1016/j.nuclphysbps.2007.02.053
|
CERN-PH-TH/2006-254; UAB-FT-620
|
hep-ph
| null |
Recent progress in the determination of |V_us| employing strange hadronic
tau-decay data are reported. This includes using the recent OPAL update of the
strange spectral function, as well as augmenting the dimension-two perturbative
contribution with the recently calculated order alpha_s^3 term on the theory
side. These updates result in |V_us| = 0.2220 +- 0.0033, with the uncertainty
presently being dominated by experiment, and already being competitive with the
standard extraction from K_e3 decays and other new proposals to determine
|V_us|. In view of the ongoing work to analyse tau-decay data at the
B-factories BaBar and Belle, as well as future results from BESIII, the error
on |V_us| from tau decays is expected to be much reduced in the near future.
|
[
{
"created": "Tue, 12 Dec 2006 18:11:17 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Gamiz",
"Elvira",
""
],
[
"Jamin",
"Matthias",
""
],
[
"Pich",
"Antonio",
""
],
[
"Prades",
"Joaquim",
""
],
[
"Schwab",
"Felix",
""
]
] |
Recent progress in the determination of |V_us| employing strange hadronic tau-decay data are reported. This includes using the recent OPAL update of the strange spectral function, as well as augmenting the dimension-two perturbative contribution with the recently calculated order alpha_s^3 term on the theory side. These updates result in |V_us| = 0.2220 +- 0.0033, with the uncertainty presently being dominated by experiment, and already being competitive with the standard extraction from K_e3 decays and other new proposals to determine |V_us|. In view of the ongoing work to analyse tau-decay data at the B-factories BaBar and Belle, as well as future results from BESIII, the error on |V_us| from tau decays is expected to be much reduced in the near future.
|
hep-ph/9807351
|
Joern Knoll
|
Yu. B. Ivanov, J. Knoll and D. N. Voskresensky
|
Self-Consistent Approximations to Non-Equilibrium Many-Body Theory
|
31 pages, Latex elsart-style
|
Nucl.Phys.A657:413-445,1999
|
10.1016/S0375-9474(99)00313-9
|
GSI-Preprint-98-34
|
hep-ph cond-mat.stat-mech nucl-th
| null |
Within the non-equilibrium Green's function technique on the real time
contour, the Phi-functional method of Baym is reviewed and generalized to
arbitrary non-equilibrium many-particle systems. The scheme may be closed at
any desired order in the number of loops or vertices of the generating
functional. It defines effective theories, which provide a closed set of
coupled classical field and Dyson equations, which are self-consistent,
conserving and thermodynamically consistent. The approach permits to include
unstable particles and therefore unifies the description of resonances with all
other particles, which obtain a mass width by collisions, decays or creation
processes in dense matter. The inclusion of classical fields enables the
treatment of soft modes and phase instabilities. The method can be taken as a
starting point for adequate and consistent quantum improvements of the
in-medium rates in transport theories.
|
[
{
"created": "Mon, 13 Jul 1998 09:56:01 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Ivanov",
"Yu. B.",
""
],
[
"Knoll",
"J.",
""
],
[
"Voskresensky",
"D. N.",
""
]
] |
Within the non-equilibrium Green's function technique on the real time contour, the Phi-functional method of Baym is reviewed and generalized to arbitrary non-equilibrium many-particle systems. The scheme may be closed at any desired order in the number of loops or vertices of the generating functional. It defines effective theories, which provide a closed set of coupled classical field and Dyson equations, which are self-consistent, conserving and thermodynamically consistent. The approach permits to include unstable particles and therefore unifies the description of resonances with all other particles, which obtain a mass width by collisions, decays or creation processes in dense matter. The inclusion of classical fields enables the treatment of soft modes and phase instabilities. The method can be taken as a starting point for adequate and consistent quantum improvements of the in-medium rates in transport theories.
|
hep-ph/9708261
|
Gerhard Schuler
|
E. Laenen (Stony Brook) and G.A. Schuler (CERN)
|
Model-independent QED corrections to photon structure-function
measurements
|
Latex, 8 pages, 3 figures, uses epsfig.sty, 12pt.sty
| null | null |
CERN-TH/97-193, ITP-SB-97-48
|
hep-ph
| null |
We present the first calculation of QED radiative corrections to
deep-inelastic electron-photon scattering in terms of those variables that are
reconstructed in measurements of the photon structure function in
electron-positron collisions. In order to cover the low-$Q^2$ region, we do not
invoke the QCD-improved parton model but rather express our results in terms of
the photon structure functions. Both analytical and numerical results are
given.
|
[
{
"created": "Wed, 6 Aug 1997 16:33:54 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Laenen",
"E.",
"",
"Stony Brook"
],
[
"Schuler",
"G. A.",
"",
"CERN"
]
] |
We present the first calculation of QED radiative corrections to deep-inelastic electron-photon scattering in terms of those variables that are reconstructed in measurements of the photon structure function in electron-positron collisions. In order to cover the low-$Q^2$ region, we do not invoke the QCD-improved parton model but rather express our results in terms of the photon structure functions. Both analytical and numerical results are given.
|
1402.4022
|
Daniele Binosi
|
D. Binosi, A. Quadri and D.N. Triantafyllopoulos
|
High-energy QCD evolution from BRST symmetry
|
28 pages, 1 figure
| null |
10.1140/epjc/s10052-014-2928-x
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the (gauge fixed) classical action of the Color Glass Condensate
is invariant under a suitable Becchi-Rouet-Stora-Tyutin symmetry, that holds
after the gluon modes are split into their fast, semi-fast and soft components,
according to the longitudinal momenta they carry. This entails the existence of
a corresponding Slavnov-Taylor identity which in turn strongly constrains the
effective field theory arising when integrating out the semi-fast modes.
Specifically, we prove that this identity guarantees the gauge invariance of
the resulting effective theory. In addition, we use it to demonstrate that the
integration over the semi-fast modes does not deform the classical Yang-Mills
equations of motion, thus validating a key assumption in the usual procedure
adopted when deriving the renormalization group equation governing the
evolution with energy of the effective theory. As far as the latter are
concerned, we finally prove that its functional form is common, and it is
determined by symmetries arguments alone. The formal properties of these
equations valid in different regimes and/or approximations (e.g., the JIMWLK
equation and its BFKL limit) can be therefore derived in a unified setting
within this algebraic approach.
|
[
{
"created": "Mon, 17 Feb 2014 14:55:30 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Binosi",
"D.",
""
],
[
"Quadri",
"A.",
""
],
[
"Triantafyllopoulos",
"D. N.",
""
]
] |
We show that the (gauge fixed) classical action of the Color Glass Condensate is invariant under a suitable Becchi-Rouet-Stora-Tyutin symmetry, that holds after the gluon modes are split into their fast, semi-fast and soft components, according to the longitudinal momenta they carry. This entails the existence of a corresponding Slavnov-Taylor identity which in turn strongly constrains the effective field theory arising when integrating out the semi-fast modes. Specifically, we prove that this identity guarantees the gauge invariance of the resulting effective theory. In addition, we use it to demonstrate that the integration over the semi-fast modes does not deform the classical Yang-Mills equations of motion, thus validating a key assumption in the usual procedure adopted when deriving the renormalization group equation governing the evolution with energy of the effective theory. As far as the latter are concerned, we finally prove that its functional form is common, and it is determined by symmetries arguments alone. The formal properties of these equations valid in different regimes and/or approximations (e.g., the JIMWLK equation and its BFKL limit) can be therefore derived in a unified setting within this algebraic approach.
|
hep-ph/0101278
|
Thomas G. Rizzo
|
Thomas G. Rizzo
|
Cartography with Accelerators: Locating Fermions in Extra Dimensions at
Future Lepton Colliders
|
32 pages, 10 figs, LaTex
|
Phys.Rev. D64 (2001) 015003
|
10.1103/PhysRevD.64.015003
|
SLAC-PUB-8746
|
hep-ph hep-ex
| null |
In the model of Arkani-Hamed and Schmaltz the various chiral fermions of the
Standard Model(SM) are localized at different points on a thick wall which
forms an extra dimension. Such a scenario provides a way of understanding the
absence of proton decay and the fermion mass hierarchy in models with extra
dimensions. In this paper we explore the capability of future lepton colliders
to determine the location of these fermions in the extra dimension through
precision measurements of conventional scattering processes both below and on
top of the lowest lying Kaluza-Klein gauge boson resonance. We show that for
some classes of models the locations of these fermions can be very precisely
determined while in others only their relative positions can be well measured.
|
[
{
"created": "Wed, 24 Jan 2001 18:35:19 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Rizzo",
"Thomas G.",
""
]
] |
In the model of Arkani-Hamed and Schmaltz the various chiral fermions of the Standard Model(SM) are localized at different points on a thick wall which forms an extra dimension. Such a scenario provides a way of understanding the absence of proton decay and the fermion mass hierarchy in models with extra dimensions. In this paper we explore the capability of future lepton colliders to determine the location of these fermions in the extra dimension through precision measurements of conventional scattering processes both below and on top of the lowest lying Kaluza-Klein gauge boson resonance. We show that for some classes of models the locations of these fermions can be very precisely determined while in others only their relative positions can be well measured.
|
1908.05179
|
Jaume Tarr\'us Castell\`a
|
Jaume Tarr\'us Castell\`a
|
Spin Structure of heavy-quark hybrids
|
10 pages, 5 figures. Proceedings for the invited plenary talk at the
15th International Conference on Meson-Nucleon Physics and the Structure of
the Nucleon (MENU19)
| null | null | null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Exotic quarkonia are candidates to new types of hadrons including four quarks
or gluonic degrees of freedom as constituents, the latter being a unique
feature of QCD. We review recent developments in nonrelativistic EFTs to
describe exotic quarkonia and in particular recent results on the spectrum of
heavy hybrids including spin-dependent contributions up to $1/m_Q^2$-terms in
the heavy-quark-mass expansion. We determine the nonperturbative contributions
to the matching coefficients of the EFT by fitting our results to lattice-QCD
determinations of the charmonium hybrid spectrum and extrapolate the results to
the bottomonium hybrid sector where lattice-QCD determinations are still
challenging. We also report on a recent new approach to quarkonium hadronic
transitions that does not use the twist expansion and uses the hybrid spectrum
as the intermediate octet states.
|
[
{
"created": "Wed, 14 Aug 2019 15:43:00 GMT",
"version": "v1"
}
] |
2019-08-15
|
[
[
"Castellà",
"Jaume Tarrús",
""
]
] |
Exotic quarkonia are candidates to new types of hadrons including four quarks or gluonic degrees of freedom as constituents, the latter being a unique feature of QCD. We review recent developments in nonrelativistic EFTs to describe exotic quarkonia and in particular recent results on the spectrum of heavy hybrids including spin-dependent contributions up to $1/m_Q^2$-terms in the heavy-quark-mass expansion. We determine the nonperturbative contributions to the matching coefficients of the EFT by fitting our results to lattice-QCD determinations of the charmonium hybrid spectrum and extrapolate the results to the bottomonium hybrid sector where lattice-QCD determinations are still challenging. We also report on a recent new approach to quarkonium hadronic transitions that does not use the twist expansion and uses the hybrid spectrum as the intermediate octet states.
|
1407.7534
|
Andrew Fowlie Dr.
|
Andrew Fowlie
|
Is the CNMSSM more credible than the CMSSM?
|
28 pages, 11 color figures. Closely matches version published in
Eur.Phys.J. C. Minor changes to title and abstract, and additional
information about scanning settings. Conclusions unchanged
|
Eur.Phys.J. C74 (2014) no.10, 3105
|
10.1140/epjc/s10052-014-3105-y
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
With Bayesian statistics, we investigate the full parameter space of the
constrained "next-to-minimal" supersymmetric Standard Model (CNMSSM) with
naturalness priors, which were derived in a previous work. In the past, most
Bayesian analyses of the CNMSSM ignored naturalness of the electroweak (EW)
scale by making prejudicial assumptions for parameters defined at the EW scale.
We test the CNMSSM against the CMSSM with Bayesian evidence, which, with
naturalness priors, incorporates a penalty for fine-tuning of the EW scale.
With the evidence, we measure credibility with respect to all measurements,
including the EW scale and LHC direct searches. We find that the evidence in
favor of the CNMSSM versus the CMSSM is "positive" to "strong" but that if one
ignores the $\mu$-problem, the evidence is "barely worth mentioning" to
"positive." The $\mu$-problem significantly influences our findings. Unless one
considers the $\mu$-problem, the evidence in favor of the CNMSSM versus the
CMSSM is at best "positive," which is two grades below "very strong." We,
furthermore, identify the most probable regions of the CMSSM and CNMSSM
parameter spaces and examine prospects for future discovery at hadron
colliders.
|
[
{
"created": "Mon, 28 Jul 2014 20:00:23 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2014 10:46:00 GMT",
"version": "v2"
}
] |
2016-09-19
|
[
[
"Fowlie",
"Andrew",
""
]
] |
With Bayesian statistics, we investigate the full parameter space of the constrained "next-to-minimal" supersymmetric Standard Model (CNMSSM) with naturalness priors, which were derived in a previous work. In the past, most Bayesian analyses of the CNMSSM ignored naturalness of the electroweak (EW) scale by making prejudicial assumptions for parameters defined at the EW scale. We test the CNMSSM against the CMSSM with Bayesian evidence, which, with naturalness priors, incorporates a penalty for fine-tuning of the EW scale. With the evidence, we measure credibility with respect to all measurements, including the EW scale and LHC direct searches. We find that the evidence in favor of the CNMSSM versus the CMSSM is "positive" to "strong" but that if one ignores the $\mu$-problem, the evidence is "barely worth mentioning" to "positive." The $\mu$-problem significantly influences our findings. Unless one considers the $\mu$-problem, the evidence in favor of the CNMSSM versus the CMSSM is at best "positive," which is two grades below "very strong." We, furthermore, identify the most probable regions of the CMSSM and CNMSSM parameter spaces and examine prospects for future discovery at hadron colliders.
|
1304.8004
|
Nan Su
|
Kenji Fukushima, Nan Su
|
Stabilizing perturbative Yang-Mills thermodynamics with Gribov
quantization
|
6 pages, 5 figures; v2 - published version
|
Phys. Rev. D 88, 076008 (2013)
|
10.1103/PhysRevD.88.076008
|
BI-TP 2013/10
|
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We evaluate the thermodynamic quantities of Yang-Mills theory using the
Gribov quantization, which deals with nonperturbative resummation. The magnetic
scale is automatically incorporated into the framework and we find it efficient
to stabilize the perturbative expansion of the free energy. In the temperature
range $T=T_c \sim 2\,T_c$ the major uncertainty in our results comes from the
nonperturbative running coupling that is adopted from the lattice simulation,
while the convergence above $2\,T_c$ is impressively robust. We also present
the corresponding interaction measure (i.e., trace anomaly) up to close to
$T_c$.
|
[
{
"created": "Tue, 30 Apr 2013 13:58:07 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Oct 2013 13:56:06 GMT",
"version": "v2"
}
] |
2013-10-22
|
[
[
"Fukushima",
"Kenji",
""
],
[
"Su",
"Nan",
""
]
] |
We evaluate the thermodynamic quantities of Yang-Mills theory using the Gribov quantization, which deals with nonperturbative resummation. The magnetic scale is automatically incorporated into the framework and we find it efficient to stabilize the perturbative expansion of the free energy. In the temperature range $T=T_c \sim 2\,T_c$ the major uncertainty in our results comes from the nonperturbative running coupling that is adopted from the lattice simulation, while the convergence above $2\,T_c$ is impressively robust. We also present the corresponding interaction measure (i.e., trace anomaly) up to close to $T_c$.
|
hep-ph/9701274
|
Fyodor V. Tkachov
|
Fyodor V. Tkachov
|
From jet algorithms to C-algebra. Measurement errors and regularization
of cuts
|
12 pp PS. Complements hep-ph/9601308. Useful Notes attached. 7.11.98:
maintenance
|
X Int. Workshop on High Energy Physics. Zvenigorod, Russia. 20-26
Sept. 1995. INP MSU. Eds.: B.Levtchenko, V.Savrin pp.324-334
| null | null |
hep-ph hep-ex
| null |
Error enhancement properties of data processing algorithms in elementary
particle physics measurements are discussed. It is argued that a systematic use
of continuous weights instead of hard cuts may reduce errors of the results at
the cost of a marginal increase of computer resources needed.
|
[
{
"created": "Sun, 12 Jan 1997 16:18:26 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Nov 1998 07:39:26 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Tkachov",
"Fyodor V.",
""
]
] |
Error enhancement properties of data processing algorithms in elementary particle physics measurements are discussed. It is argued that a systematic use of continuous weights instead of hard cuts may reduce errors of the results at the cost of a marginal increase of computer resources needed.
|
hep-ph/0105105
|
Smirnov Alexei
|
Y. Farzan, O. L. G. Peres and A. Yu. Smirnov
|
Neutrino Mass Spectrum and Future Beta Decay Experiments
|
48 pages, LaTeX, 8 figures, typos removed, references and discussion
of the supernova neutrino bounds added
|
Nucl.Phys.B612:59-97,2001
|
10.1016/S0550-3213(01)00361-3
| null |
hep-ph hep-ex
| null |
We study the discovery potential of future beta decay experiments on searches
for the neutrino mass in the sub-eV range, and, in particular, KATRIN
experiment with sensitivity $m > 0.3$ eV. Effects of neutrino mass and mixing
on the beta decay spectrum in the neutrino schemes which explain the solar and
atmospheric neutrino data are discussed. The schemes which lead to observable
effects contain one or two sets of quasi-degenerate states. Future beta decay
measurements will allow to check the three neutrino scheme with mass
degeneracy, moreover, the possibility appears to measure the CP-violating
Majorana phase. Effects in the four neutrino schemes which can also explain the
LSND data are strongly restricted by the results of Bugey and CHOOZ oscillation
experiments: Apart from bending of the spectrum and the shift of the end point
one expects appearance of small kink of ($ < 2% $) size or suppressed tail
after bending of the spectrum with rate below 2 % of the expected rate for zero
neutrino mass. We consider possible implications of future beta decay
experiments for the neutrino mass spectrum, the determination of the absolute
scale of neutrino mass and for establishing the nature of neutrinos. We show
that beta decay measurements in combination with data from the oscillation and
double beta decay experiments will allow to establish the structure of the
scheme (hierarchical or non-hierarchical), the type of the hierarchy or
ordering of states (normal or inverted) and to measure the relative
CP-violating phase in the solar pair of states.
|
[
{
"created": "Fri, 11 May 2001 19:02:36 GMT",
"version": "v1"
},
{
"created": "Sat, 12 May 2001 17:28:02 GMT",
"version": "v2"
},
{
"created": "Sat, 26 May 2001 17:24:12 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Farzan",
"Y.",
""
],
[
"Peres",
"O. L. G.",
""
],
[
"Smirnov",
"A. Yu.",
""
]
] |
We study the discovery potential of future beta decay experiments on searches for the neutrino mass in the sub-eV range, and, in particular, KATRIN experiment with sensitivity $m > 0.3$ eV. Effects of neutrino mass and mixing on the beta decay spectrum in the neutrino schemes which explain the solar and atmospheric neutrino data are discussed. The schemes which lead to observable effects contain one or two sets of quasi-degenerate states. Future beta decay measurements will allow to check the three neutrino scheme with mass degeneracy, moreover, the possibility appears to measure the CP-violating Majorana phase. Effects in the four neutrino schemes which can also explain the LSND data are strongly restricted by the results of Bugey and CHOOZ oscillation experiments: Apart from bending of the spectrum and the shift of the end point one expects appearance of small kink of ($ < 2% $) size or suppressed tail after bending of the spectrum with rate below 2 % of the expected rate for zero neutrino mass. We consider possible implications of future beta decay experiments for the neutrino mass spectrum, the determination of the absolute scale of neutrino mass and for establishing the nature of neutrinos. We show that beta decay measurements in combination with data from the oscillation and double beta decay experiments will allow to establish the structure of the scheme (hierarchical or non-hierarchical), the type of the hierarchy or ordering of states (normal or inverted) and to measure the relative CP-violating phase in the solar pair of states.
|
2102.00435
|
Manu Kurian
|
Manu Kurian
|
Thermoelectric behaviour of hot collisional and magnetized QCD medium
from an effective kinetic theory
|
11 pages, 3 figures
|
Phys. Rev. D 103, 054024 (2021)
|
10.1103/PhysRevD.103.054024
|
Physical Review D (Vol. 103, No. 5)
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The thermoelectric behaviour of quark-gluon plasma has been studied within
the framework of an effective kinetic theory by adopting a quasiparticle model
to incorporate the thermal medium effects. The thermoelectric response of the
medium has been quantified in terms of the Seebeck coefficient. The dependence
of the collisional aspects of the QCD medium on the Seebeck coefficient has
been estimated by utilizing relaxation time approximation and
Bhatnagar-Gross-Krook collision kernels in the effective Boltzmann equation.
The thermoelectric coefficient is seen to depend on the quark chemical
potential and collision aspects of the medium. Besides, the thermoelectric
effect has been explored in a magnetized medium and the respective transport
coefficients, such as magnetic field-dependent Seebeck coefficient and Nernst
coefficient, have been estimated. The impacts of hot QCD medium interactions
incorporated through the effective model and the magnetic field on the
thermoelectric responses of the medium have been observed to be more prominent
in the temperature regimes not very far from the transition temperature.
|
[
{
"created": "Sun, 31 Jan 2021 11:33:09 GMT",
"version": "v1"
}
] |
2021-03-29
|
[
[
"Kurian",
"Manu",
""
]
] |
The thermoelectric behaviour of quark-gluon plasma has been studied within the framework of an effective kinetic theory by adopting a quasiparticle model to incorporate the thermal medium effects. The thermoelectric response of the medium has been quantified in terms of the Seebeck coefficient. The dependence of the collisional aspects of the QCD medium on the Seebeck coefficient has been estimated by utilizing relaxation time approximation and Bhatnagar-Gross-Krook collision kernels in the effective Boltzmann equation. The thermoelectric coefficient is seen to depend on the quark chemical potential and collision aspects of the medium. Besides, the thermoelectric effect has been explored in a magnetized medium and the respective transport coefficients, such as magnetic field-dependent Seebeck coefficient and Nernst coefficient, have been estimated. The impacts of hot QCD medium interactions incorporated through the effective model and the magnetic field on the thermoelectric responses of the medium have been observed to be more prominent in the temperature regimes not very far from the transition temperature.
|
2311.08311
|
Florian Nortier
|
Pratik Chattopadhyay, Florian Nortier
|
Ghost-Free Electroweak Symmetry Breaking with Weakly Nonlocal
Interactions
|
14 pages (+ references), 4 figures. v3: Title changed. More details
about classicalization. Same results
| null | null | null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
Weakly nonlocal (WNL) Quantum Field Theories (QFT's) may define a new class
of UV-completions in particle physics and gravity, without introducing any new
elementary particle. One problematic issue is how to realize spontaneous
symmetry breaking without introducing an infinite tower of ghosts in the
perturbative spectrum. In this article, a WNL extension of the Standard Model
(SM) is proposed: the Fuzzy Standard Model (FSM). It is a smooth deformation of
the SM based on covariant star-products of fields. This new formalism realizes
electroweak symmetry breaking without ghosts at tree-level. We give evidences
that the FSM exhibit Vainshtein screening, aka classicalization, in the
deep-UV. This could solve the electroweak hierarchy problem if it occurs at the
TeV-scale.
|
[
{
"created": "Tue, 14 Nov 2023 16:55:34 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2024 13:52:00 GMT",
"version": "v2"
},
{
"created": "Tue, 28 May 2024 12:58:44 GMT",
"version": "v3"
}
] |
2024-05-29
|
[
[
"Chattopadhyay",
"Pratik",
""
],
[
"Nortier",
"Florian",
""
]
] |
Weakly nonlocal (WNL) Quantum Field Theories (QFT's) may define a new class of UV-completions in particle physics and gravity, without introducing any new elementary particle. One problematic issue is how to realize spontaneous symmetry breaking without introducing an infinite tower of ghosts in the perturbative spectrum. In this article, a WNL extension of the Standard Model (SM) is proposed: the Fuzzy Standard Model (FSM). It is a smooth deformation of the SM based on covariant star-products of fields. This new formalism realizes electroweak symmetry breaking without ghosts at tree-level. We give evidences that the FSM exhibit Vainshtein screening, aka classicalization, in the deep-UV. This could solve the electroweak hierarchy problem if it occurs at the TeV-scale.
|
hep-ph/9210245
| null |
O.W. Greenberg
|
Scaling limit of a non-relativistic model
|
10 pages, 3 figures not included, in LaTex, UMD 92-223
|
Phys.Rev. D47 (1993) 331-335
|
10.1103/PhysRevD.47.331
| null |
hep-ph
| null |
I calculate the structure function for scattering from the two-body bound
state in its lowest level in a non-relativistic model of confined scalar
``quarks'' of masses $m_A$ and $m_B$. The scaling limit in $x={\bf
q}^2/2(m_A+m_B)q^0$ exists and is non-vanishing only for the values
$x=m_A/(m_A+m_B)$ and $x=m_B/(m_A+m_B)$ which correspond to the fractions of
the momentum of the two-body system carried by each of the ``quarks.'' In the
scaling limit, the interference from scattering off of the two ``quarks''
vanishes. Thus the scaling limit of this model agrees with the parton picture.
|
[
{
"created": "Mon, 19 Oct 1992 17:49:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Greenberg",
"O. W.",
""
]
] |
I calculate the structure function for scattering from the two-body bound state in its lowest level in a non-relativistic model of confined scalar ``quarks'' of masses $m_A$ and $m_B$. The scaling limit in $x={\bf q}^2/2(m_A+m_B)q^0$ exists and is non-vanishing only for the values $x=m_A/(m_A+m_B)$ and $x=m_B/(m_A+m_B)$ which correspond to the fractions of the momentum of the two-body system carried by each of the ``quarks.'' In the scaling limit, the interference from scattering off of the two ``quarks'' vanishes. Thus the scaling limit of this model agrees with the parton picture.
|
hep-ph/0210013
|
Tom Steele
|
T.G. Steele, D. Harnett, G. Orlandini
|
Gaussian Sum-Rules, Scalar Gluonium, and Instantons
|
19 pages, 5 eps figures embedded in manuscript. Write-up of
presentation given at SUNY IT Conference on Theoretical High-Energy Physics,
2002
| null | null | null |
hep-ph
| null |
Gaussian sum-rules relate a QCD prediction to a two-parameter
Gaussian-weighted integral of a hadronic spectral function, providing a clear
conceptual connection to quark-hadron duality. In contrast to Laplace
sum-rules, the Gaussian sum-rules exhibit enhanced sensitivity to excited
states of the hadronic spectral function. The formulation of Gaussian sum-rules
and associated analysis techniques for extracting hadronic properties from the
sum-rules are reviewed and applied to scalar gluonium. With the inclusion of
instanton effects, the Gaussian sum-rule analysis results in a consistent
scenario where the gluonic resonance strength is spread over a broad energy
range below 1.6 GeV, and indicates the presence of gluonium content in more
than one hadronic state.
|
[
{
"created": "Tue, 1 Oct 2002 19:42:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Steele",
"T. G.",
""
],
[
"Harnett",
"D.",
""
],
[
"Orlandini",
"G.",
""
]
] |
Gaussian sum-rules relate a QCD prediction to a two-parameter Gaussian-weighted integral of a hadronic spectral function, providing a clear conceptual connection to quark-hadron duality. In contrast to Laplace sum-rules, the Gaussian sum-rules exhibit enhanced sensitivity to excited states of the hadronic spectral function. The formulation of Gaussian sum-rules and associated analysis techniques for extracting hadronic properties from the sum-rules are reviewed and applied to scalar gluonium. With the inclusion of instanton effects, the Gaussian sum-rule analysis results in a consistent scenario where the gluonic resonance strength is spread over a broad energy range below 1.6 GeV, and indicates the presence of gluonium content in more than one hadronic state.
|
2304.00109
|
Leonardo Tinti
|
Leonardo Tinti
|
Quantum free-streaming: out of equilibrium expansion for the free scalar
fields
|
15 pages, 1 figure
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The collisionless Boltzmann equation, also called free-streaming, is a
convenient approximation. It is rather simple to implement numerically, and and
it is effective at reducing the irregularities of rough initial conditions. It
can be obtained as a small $\hbar$ limit from a free scalar quantum field.
Namely, by neglecting the $\hbar^2$ term in the dynamical evolution of the
Wigner distribution, the quantum precursor of the distribution function.
In this work it is presented the general form for the exact solutions of the
Wigner distribution, for a scalar field undergoing a $(1+1)$-dimensional
expansion. Namely, with the symmetry constraint of rotation and translation
invariance in the transverse plane. It is very different from the (on-shell)
free-streaming of classical particles. It is shown how to recognize the
classical, $\hbar\to 0$, limit from the general form. The numerical analysis
for a specific example shows very large quantum corrections to the classical
free-streaming.
|
[
{
"created": "Fri, 31 Mar 2023 20:16:18 GMT",
"version": "v1"
}
] |
2023-04-04
|
[
[
"Tinti",
"Leonardo",
""
]
] |
The collisionless Boltzmann equation, also called free-streaming, is a convenient approximation. It is rather simple to implement numerically, and and it is effective at reducing the irregularities of rough initial conditions. It can be obtained as a small $\hbar$ limit from a free scalar quantum field. Namely, by neglecting the $\hbar^2$ term in the dynamical evolution of the Wigner distribution, the quantum precursor of the distribution function. In this work it is presented the general form for the exact solutions of the Wigner distribution, for a scalar field undergoing a $(1+1)$-dimensional expansion. Namely, with the symmetry constraint of rotation and translation invariance in the transverse plane. It is very different from the (on-shell) free-streaming of classical particles. It is shown how to recognize the classical, $\hbar\to 0$, limit from the general form. The numerical analysis for a specific example shows very large quantum corrections to the classical free-streaming.
|
hep-ph/0110096
|
Takeo Moroi
|
Takeo Moroi and Tomo Takahashi
|
Effects of Cosmological Moduli Fields on Cosmic Microwave Background
|
11pages, 4 figures, numerical error corrected
|
Phys.Lett.B522:215-221,2001; Erratum-ibid.B539:303,2002
|
10.1016/S0370-2693(01)01295-3
|
TU-632
|
hep-ph astro-ph gr-qc
| null |
We discuss effects of cosmological moduli fields on the cosmic microwave
background (CMB). If a modulus field \phi once dominates the universe, the CMB
we observe today is from the decay of \phi and its anisotropy is affected by
the primordial fluctuation in the amplitude of the modulus field. Consequently,
constraints on the inflaton potential from the CMB anisotropy can be relaxed.
In particular, the scale of the inflation may be significantly lowered. In
addition, with the cosmological moduli fields, correlated mixture of adiabatic
and isocurvature fluctuations may be generated, which results in enhanced CMB
angular power spectrum at higher multipoles relative to that of lower ones.
Such an enhancement can be an evidence of the cosmological moduli fields, and
may be observed in future satellite experiments.
|
[
{
"created": "Sun, 7 Oct 2001 06:26:41 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2001 05:24:57 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jun 2002 07:57:25 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Moroi",
"Takeo",
""
],
[
"Takahashi",
"Tomo",
""
]
] |
We discuss effects of cosmological moduli fields on the cosmic microwave background (CMB). If a modulus field \phi once dominates the universe, the CMB we observe today is from the decay of \phi and its anisotropy is affected by the primordial fluctuation in the amplitude of the modulus field. Consequently, constraints on the inflaton potential from the CMB anisotropy can be relaxed. In particular, the scale of the inflation may be significantly lowered. In addition, with the cosmological moduli fields, correlated mixture of adiabatic and isocurvature fluctuations may be generated, which results in enhanced CMB angular power spectrum at higher multipoles relative to that of lower ones. Such an enhancement can be an evidence of the cosmological moduli fields, and may be observed in future satellite experiments.
|
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