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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2111.13731
|
Ismail Soudi
|
Soeren Schlichting and Ismail Soudi
|
Splitting rates in QCD plasmas from a non-perturbative determination of
the momentum broadening kernel $C(q_{\bot})$
|
19 pages, 10 figures, pulished version
|
Phys.Rev.D 105 (2022) 7, 076002
|
10.1103/PhysRevD.105.076002
| null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We exploit a recent non-perturbative determination of the momentum broadening
kernel $C(b_{\bot})$ in impact parameter space \cite{Moore:2021jwe}, to
determine the momentum space broadening kernel $C(q_{\bot})$ in
high-temperature QCD plasmas. We show how to use the non-pertubatively
determined kernel $C(q_{\bot})$ to compute the medium-induced splitting rates
in a QCD plasma of finite size. We compare the resulting in-medium splitting
rates to the results obtained with leading-order and next-to-leading order
perturbative determinations of $C(q_{\bot})$, as well as with various
approximations of the splitting employed in the literature. Generally, we find
that the differences in the splitting rates due to the momentum broadening
kernel are larger than the errors associated with approximations of the
splitting rate.
|
[
{
"created": "Fri, 26 Nov 2021 19:53:16 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2022 12:48:29 GMT",
"version": "v2"
}
] |
2022-05-30
|
[
[
"Schlichting",
"Soeren",
""
],
[
"Soudi",
"Ismail",
""
]
] |
We exploit a recent non-perturbative determination of the momentum broadening kernel $C(b_{\bot})$ in impact parameter space \cite{Moore:2021jwe}, to determine the momentum space broadening kernel $C(q_{\bot})$ in high-temperature QCD plasmas. We show how to use the non-pertubatively determined kernel $C(q_{\bot})$ to compute the medium-induced splitting rates in a QCD plasma of finite size. We compare the resulting in-medium splitting rates to the results obtained with leading-order and next-to-leading order perturbative determinations of $C(q_{\bot})$, as well as with various approximations of the splitting employed in the literature. Generally, we find that the differences in the splitting rates due to the momentum broadening kernel are larger than the errors associated with approximations of the splitting rate.
|
1409.6970
|
Zhen-hua Zhao
|
Yu-Feng Li, Zhen-hua Zhao
|
Tests of Lorentz and CPT Violation in the Medium Baseline Reactor
Antineutrino Experiment
|
16 pages, 12 figures, version accepted for publication in PRD
|
Phys. Rev. D 90, 113014 (2014)
|
10.1103/PhysRevD.90.113014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Tests of Lorentz and CPT violation in the medium baseline reactor
antineutrino experiment are presented in the framework of the Standard Model
Extension (SME). Both the spectral distortion and sidereal variation are
employed to derive the limits of Lorentz violation (LV) coefficients. We do the
numerical analysis of the sensitivity of LV coefficients by taking the Jiangmen
Underground Neutrino Observatory (JUNO) as an illustration, which can improve
the sensitivity by more than two orders of magnitude compared with the current
limits from reactor antineutrino experiments.
|
[
{
"created": "Wed, 24 Sep 2014 14:28:25 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Nov 2014 03:05:24 GMT",
"version": "v2"
}
] |
2015-01-07
|
[
[
"Li",
"Yu-Feng",
""
],
[
"Zhao",
"Zhen-hua",
""
]
] |
Tests of Lorentz and CPT violation in the medium baseline reactor antineutrino experiment are presented in the framework of the Standard Model Extension (SME). Both the spectral distortion and sidereal variation are employed to derive the limits of Lorentz violation (LV) coefficients. We do the numerical analysis of the sensitivity of LV coefficients by taking the Jiangmen Underground Neutrino Observatory (JUNO) as an illustration, which can improve the sensitivity by more than two orders of magnitude compared with the current limits from reactor antineutrino experiments.
|
2011.00530
|
David d'Enterria
|
David d'Enterria and Cynthia Yan
|
Revised QCD effects on the Z $\to b\bar{b}$ forward-backward asymmetry
|
12 pages, 3 figs, 3 tables
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The forward-backward (FB) asymmetry of $b$ quarks in $e^+e^-$ collisions at
the Z pole measured at LEP, $A_{FB}^{0,b} = 0.0992\pm0.0016$, remains today the
electroweak precision observable with the largest disagreement (2.4$\sigma$)
with respect to the Standard Model prediction, $(A_{FB}^{0,b})_{_{\rm th}} =
0.1030 \pm 0.0002$. Beyond the dominant statistical uncertainties, QCD effects,
such as $b$-quark showering and hadronization, are the leading sources of
$A_{FB}^{0,b}$ systematic uncertainty, and have not been revised in the last
twenty years. We reassess the QCD uncertainties of the eight original
$A_{FB}^{0,b}$ LEP measurements, using modern parton shower PYTHIA-8 and
PYTHIA-8 + VINCIA simulations with nine different implementations of soft and
collinear radiation as well as of parton fragmentation. Our analysis, combined
with NNLO massive $b$-quark corrections independently computed recently,
indicates total propagated QCD uncertainties of $\sim$0.7% and $\sim$0.3% for
the lepton-charge and jet-charge analyses, respectively, that are about a
factor of two smaller than those of the original LEP results. Accounting for
such updated QCD effects leads to a new $A_{FB}^{0,b} = 0.0996\pm0.0016$
average, with a data-theory tension slightly reduced from 2.4$\sigma$ to
2.1$\sigma$. Confirmation or resolution of this long-term discrepancy requires
a new high-luminosity $e^+e^-$ collider collecting orders-of-magnitude more
data at the Z pole to significantly reduce the $A_{FB}^{0,b}$ statistical
uncertainties.
|
[
{
"created": "Sun, 1 Nov 2020 15:17:51 GMT",
"version": "v1"
}
] |
2020-11-03
|
[
[
"d'Enterria",
"David",
""
],
[
"Yan",
"Cynthia",
""
]
] |
The forward-backward (FB) asymmetry of $b$ quarks in $e^+e^-$ collisions at the Z pole measured at LEP, $A_{FB}^{0,b} = 0.0992\pm0.0016$, remains today the electroweak precision observable with the largest disagreement (2.4$\sigma$) with respect to the Standard Model prediction, $(A_{FB}^{0,b})_{_{\rm th}} = 0.1030 \pm 0.0002$. Beyond the dominant statistical uncertainties, QCD effects, such as $b$-quark showering and hadronization, are the leading sources of $A_{FB}^{0,b}$ systematic uncertainty, and have not been revised in the last twenty years. We reassess the QCD uncertainties of the eight original $A_{FB}^{0,b}$ LEP measurements, using modern parton shower PYTHIA-8 and PYTHIA-8 + VINCIA simulations with nine different implementations of soft and collinear radiation as well as of parton fragmentation. Our analysis, combined with NNLO massive $b$-quark corrections independently computed recently, indicates total propagated QCD uncertainties of $\sim$0.7% and $\sim$0.3% for the lepton-charge and jet-charge analyses, respectively, that are about a factor of two smaller than those of the original LEP results. Accounting for such updated QCD effects leads to a new $A_{FB}^{0,b} = 0.0996\pm0.0016$ average, with a data-theory tension slightly reduced from 2.4$\sigma$ to 2.1$\sigma$. Confirmation or resolution of this long-term discrepancy requires a new high-luminosity $e^+e^-$ collider collecting orders-of-magnitude more data at the Z pole to significantly reduce the $A_{FB}^{0,b}$ statistical uncertainties.
|
hep-ph/9509234
|
Xiang Qian Luo
|
Q.Z. Chen, S.H. Guo, X.Q. Luo, A. Segui
|
Spectroscopy and large scale wave functions
|
4 pages, uses fps.sty, fig1.ps and fig2.ps (appended)
|
Nucl.Phys.Proc.Suppl. 47 (1996) 274
|
10.1016/0920-5632(96)00055-2
|
HLRZ-95-51
|
hep-ph
| null |
We discuss the relevance of long wavelength excitations for the low energy
spectrum of QCD, and try to develop an efficient method for solving the
Schrodinger equation, and for extracting the glueball masses and long
wavelength functions of the ground and excited states. Some technical problems
appearing in the calculations of SU(3) gauge theory are discussed.
|
[
{
"created": "Wed, 6 Sep 1995 11:02:07 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Chen",
"Q. Z.",
""
],
[
"Guo",
"S. H.",
""
],
[
"Luo",
"X. Q.",
""
],
[
"Segui",
"A.",
""
]
] |
We discuss the relevance of long wavelength excitations for the low energy spectrum of QCD, and try to develop an efficient method for solving the Schrodinger equation, and for extracting the glueball masses and long wavelength functions of the ground and excited states. Some technical problems appearing in the calculations of SU(3) gauge theory are discussed.
|
1601.07880
|
Tania Robens
|
Tania Robens and Tim Stefaniak
|
LHC Benchmark Scenarios for the Real Higgs Singlet Extension of the
Standard Model
|
23 pages, 9 tables, 4 figures. arXiv admin note: text overlap with
arXiv:1501.02234; v2: one subsection, one figure, and some references added,
minor errors corrected. Corresponds to published journal version
|
Eur.Phys.J. C76 (2016) no.5, 268
|
10.1140/epjc/s10052-016-4115-8
|
SCIPP 16/03
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present benchmark scenarios for searches for an additional Higgs state in
the real Higgs singlet extension of the Standard Model in Run 2 of the LHC. The
scenarios are selected such that they fulfill all relevant current theoretical
and experimental constraints, but can potentially be discovered at the current
LHC run. We take into account the results presented in earlier work and update
the experimental constraints from relevant LHC Higgs searches and signal rate
measurements. The benchmark scenarios are given separately for the low mass and
high mass region, i.e. the mass range where the additional Higgs state is
lighter or heavier than the discovered Higgs state at around 125 GeV. They have
also been presented in the framework of the LHC Higgs Cross Section Working
Group.
|
[
{
"created": "Thu, 28 Jan 2016 19:48:55 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2016 11:24:14 GMT",
"version": "v2"
}
] |
2016-05-26
|
[
[
"Robens",
"Tania",
""
],
[
"Stefaniak",
"Tim",
""
]
] |
We present benchmark scenarios for searches for an additional Higgs state in the real Higgs singlet extension of the Standard Model in Run 2 of the LHC. The scenarios are selected such that they fulfill all relevant current theoretical and experimental constraints, but can potentially be discovered at the current LHC run. We take into account the results presented in earlier work and update the experimental constraints from relevant LHC Higgs searches and signal rate measurements. The benchmark scenarios are given separately for the low mass and high mass region, i.e. the mass range where the additional Higgs state is lighter or heavier than the discovered Higgs state at around 125 GeV. They have also been presented in the framework of the LHC Higgs Cross Section Working Group.
|
1305.5042
|
Jian Zhou Mr.
|
Andreas Sch\"afer and Jian Zhou
|
On the process dependent nuclear $k_\perp$ broadening effect
|
17 pages, 3 figures
|
Phys. Rev. D 88, 074012 (2013)
|
10.1103/PhysRevD.88.074012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the process dependent nuclear $k_\perp$ broadening effect by
employing the transverse momentum dependent(TMD) factorization approach in
combination with the Mclerran-Venugopalan(MV) model. More specifically, we
investigate how the parton transverse momentum distributions are affected by
the process dependent gauge links in cold nuclear matter. In particular, our
analysis also applies to the polarized cases including the nuclear quark
Boer-Mulders function and the linearly polarized gluon distribution. Our main
focus is on the nuclear TMDs at intermediate or large x.
|
[
{
"created": "Wed, 22 May 2013 08:07:31 GMT",
"version": "v1"
}
] |
2013-10-30
|
[
[
"Schäfer",
"Andreas",
""
],
[
"Zhou",
"Jian",
""
]
] |
We study the process dependent nuclear $k_\perp$ broadening effect by employing the transverse momentum dependent(TMD) factorization approach in combination with the Mclerran-Venugopalan(MV) model. More specifically, we investigate how the parton transverse momentum distributions are affected by the process dependent gauge links in cold nuclear matter. In particular, our analysis also applies to the polarized cases including the nuclear quark Boer-Mulders function and the linearly polarized gluon distribution. Our main focus is on the nuclear TMDs at intermediate or large x.
|
1504.01768
|
Natascia Vignaroli
|
Natascia Vignaroli
|
Z-peaked excess from heavy gluon decays to vector-like quarks
|
23 pp. v2: minor changes, references added
|
Phys. Rev. D 91, 115009 (2015)
|
10.1103/PhysRevD.91.115009
|
MSUHEP-150407
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A 3 sigma excess has been recently announced by ATLAS in events with Z-peaked
dilepton pairs, jets, and large transverse missing energy. We interpret this
finding in the context of composite Higgs / RS theories. We find that composite
Higgs theories with custodial symmetry protection to the $Zb\bar{b}$ coupling
predict a significant contribution to $ZZbb$ (and to $hhbb$) final states
coming from heavy gluon decays to pairs of bottom-partner vector-like quarks.
The heavy gluon to vector-like quarks signal is largely accepted by the ATLAS
selection if one of the $Z$ boson in the $ZZbb$ final state decays leptonically
and the other to neutrinos. For a bottom partner of $\sim$900 GeV, we find that
the ATLAS excess can be reproduced by composite Higgs models, in an
experimentally allowed parameter space, for heavy gluon masses roughly in a
range 1.87 - 2.15 TeV and for heavy gluon couplings to light quarks within
$\sim(0.3-0.65) g_S$. We briefly discuss the implication of this result for
future experimental tests.
|
[
{
"created": "Tue, 7 Apr 2015 22:03:52 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Apr 2015 19:14:38 GMT",
"version": "v2"
}
] |
2015-06-17
|
[
[
"Vignaroli",
"Natascia",
""
]
] |
A 3 sigma excess has been recently announced by ATLAS in events with Z-peaked dilepton pairs, jets, and large transverse missing energy. We interpret this finding in the context of composite Higgs / RS theories. We find that composite Higgs theories with custodial symmetry protection to the $Zb\bar{b}$ coupling predict a significant contribution to $ZZbb$ (and to $hhbb$) final states coming from heavy gluon decays to pairs of bottom-partner vector-like quarks. The heavy gluon to vector-like quarks signal is largely accepted by the ATLAS selection if one of the $Z$ boson in the $ZZbb$ final state decays leptonically and the other to neutrinos. For a bottom partner of $\sim$900 GeV, we find that the ATLAS excess can be reproduced by composite Higgs models, in an experimentally allowed parameter space, for heavy gluon masses roughly in a range 1.87 - 2.15 TeV and for heavy gluon couplings to light quarks within $\sim(0.3-0.65) g_S$. We briefly discuss the implication of this result for future experimental tests.
|
0707.3196
|
Masaharu Iwasaki
|
Takahiko Fukutome and Masaharu Iwasaki
|
Effect of Soft Modes on the Shear Viscosity of Quark Matter
|
8 pages, 11 figures
|
Prog.Theor.Phys.119:991-1004,2008
|
10.1143/PTP.119.991
| null |
hep-ph
| null |
We calculate shear viscosity of the quark matter at finite temperature and
density. If we assume that the quark interacts with the soft mode, which is a
collective mode of quark-antiquark pair, the self energy of the quark is
calculated by using the quasi-particle random phase approximation. It is shown
that its imaginary part is large and the mean free path of the quark is short.
With the use of the Kubo formula, the shear viscosity of quark matter becomes
small. The Reynolds number of the quark matter is estimated to be about $3\sim
30$. As the temperature increases, the shear viscosity increases gradually for
$T>200{\rm MeV}$. Moreover it is shown that the shear viscosity is not
sensitive to the chemical potential.
|
[
{
"created": "Sat, 21 Jul 2007 08:30:07 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Fukutome",
"Takahiko",
""
],
[
"Iwasaki",
"Masaharu",
""
]
] |
We calculate shear viscosity of the quark matter at finite temperature and density. If we assume that the quark interacts with the soft mode, which is a collective mode of quark-antiquark pair, the self energy of the quark is calculated by using the quasi-particle random phase approximation. It is shown that its imaginary part is large and the mean free path of the quark is short. With the use of the Kubo formula, the shear viscosity of quark matter becomes small. The Reynolds number of the quark matter is estimated to be about $3\sim 30$. As the temperature increases, the shear viscosity increases gradually for $T>200{\rm MeV}$. Moreover it is shown that the shear viscosity is not sensitive to the chemical potential.
|
2211.09637
|
Michael Edmund Tobar
|
Michael E. Tobar, Catriona A. Thomson, Benjamin T. McAllister, Maxim
Goryachev, Anton Sokolov, Andreas Ringwald
|
Sensitivity of Resonant Axion Haloscopes to Quantum
Electromagnetodynamics
|
Published Version in Annalen der Physik
https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202200594
|
Ann. Phys.(Berlin) 2023, 2200594
|
10.1002/andp.202200594
| null |
hep-ph gr-qc hep-ex physics.ins-det quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently interactions between putative axions and magnetic monopoles have
been revisited by two of us [arXiv:2205.02605 [hep-ph]]. It has been shown that
significant modifications to conventional axion electrodynamics arise due to
these interactions, so that the axion-photon coupling parameter space is
expanded from one parameter $g_{a\gamma\gamma}$ to three
$(g_{a\gamma\gamma},g_{aAB},g_{aBB})$. We implement Poynting theorem to
determine how to exhibit sensitivity to $g_{aAB}$ and $g_{aBB}$ using resonant
haloscopes, allowing new techniques to search for axions and a possible
indirect way to determine if magnetically charged matter exists.
|
[
{
"created": "Thu, 17 Nov 2022 16:38:42 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2023 07:37:31 GMT",
"version": "v2"
}
] |
2023-04-25
|
[
[
"Tobar",
"Michael E.",
""
],
[
"Thomson",
"Catriona A.",
""
],
[
"McAllister",
"Benjamin T.",
""
],
[
"Goryachev",
"Maxim",
""
],
[
"Sokolov",
"Anton",
""
],
[
"Ringwald",
"Andreas",
""
]
] |
Recently interactions between putative axions and magnetic monopoles have been revisited by two of us [arXiv:2205.02605 [hep-ph]]. It has been shown that significant modifications to conventional axion electrodynamics arise due to these interactions, so that the axion-photon coupling parameter space is expanded from one parameter $g_{a\gamma\gamma}$ to three $(g_{a\gamma\gamma},g_{aAB},g_{aBB})$. We implement Poynting theorem to determine how to exhibit sensitivity to $g_{aAB}$ and $g_{aBB}$ using resonant haloscopes, allowing new techniques to search for axions and a possible indirect way to determine if magnetically charged matter exists.
|
1111.6594
|
Maxim Perelstein
|
Joshua Berger, Maxim Perelstein, Michael Saelim, Andrew Spray
|
Boosted Tops from Gluino Decays
|
5 pages, 3 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Naturalness considerations, together with the non-observation of
superpartners of the Standard Model particles at the Large Hadron Collider
(LHC) so far, favor supersymmetric (SUSY) models in which third generation
squarks are significantly lighter than those of the first two generations. In
such models, gluino pair-production is typically the dominant SUSY production
process at the LHC, and it often leads to final states with multiple top
quarks. Some of these top quarks may be relativistic in the lab frame, in which
case their hadronic decays may produce "top jets". We propose that the recently
developed techniques for tagging top jets can be used to boost sensitivity of
the LHC searches for this scenario. For example, within the simplified model
used for this study, we estimate that a search with 2 top-tagged jets can probe
gluino masses of up to about 1 TeV at the 7 TeV LHC with 30 inverse fb
integrated luminosity.
|
[
{
"created": "Mon, 28 Nov 2011 21:00:06 GMT",
"version": "v1"
}
] |
2011-12-09
|
[
[
"Berger",
"Joshua",
""
],
[
"Perelstein",
"Maxim",
""
],
[
"Saelim",
"Michael",
""
],
[
"Spray",
"Andrew",
""
]
] |
Naturalness considerations, together with the non-observation of superpartners of the Standard Model particles at the Large Hadron Collider (LHC) so far, favor supersymmetric (SUSY) models in which third generation squarks are significantly lighter than those of the first two generations. In such models, gluino pair-production is typically the dominant SUSY production process at the LHC, and it often leads to final states with multiple top quarks. Some of these top quarks may be relativistic in the lab frame, in which case their hadronic decays may produce "top jets". We propose that the recently developed techniques for tagging top jets can be used to boost sensitivity of the LHC searches for this scenario. For example, within the simplified model used for this study, we estimate that a search with 2 top-tagged jets can probe gluino masses of up to about 1 TeV at the 7 TeV LHC with 30 inverse fb integrated luminosity.
|
2311.05509
|
Oleksandr Zenaiev
|
M.V. Garzelli, J. Mazzitelli, S.-O. Moch, O. Zenaiev
|
Top-quark pole mass extraction at NNLO accuracy, from total, single- and
double-differential cross sections for $t\bar{t}+X$ production at the LHC
| null |
JHEP05(2024)321
|
10.1007/JHEP05(2024)321
|
DESY-23-179, PSI-PR-23-42
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extract the top-quark mass value in the on-shell renormalization scheme
from the comparison of theoretical predictions for $pp \rightarrow t\bar{t} +
X$ at next-to-next-to-leading order (NNLO) QCD accuracy with experimental data
collected by the ATLAS and CMS collaborations for absolute total, normalized
single-differential and double-differential cross-sections during Run 1, Run 2
and the ongoing Run 3 at the Large Hadron Collider (LHC). For the theory
computations of heavy-quark pair-production we use the MATRIX framework,
interfaced to PineAPPL for the generation of grids of theory predictions, which
can be efficiently used a-posteriori during the fit, performed within xFitter.
We take several state-of-the-art parton distribution functions (PDFs) as input
for the fit and evaluate their associated uncertainties, as well as the
uncertainties arising from renormalization and factorization scale variation.
Fit uncertainties related to the datasets are also part of the extracted
uncertainty of the top-quark mass and turn out to be of similar size as the
combined scale and PDF uncertainty. Fit results from different PDF sets agree
among each other within 1$\sigma$ uncertainty, whereas some datasets related to
$t\bar{t}$ decay in different channels (dileptonic vs. semileptonic) point
towards top-quark mass values in slight tension among each other, although
still compatible within $2.5 \sigma$ accuracy. Our results are compatible with
the PDG 2022 top-quark pole-mass value. Our work opens the road towards more
complex simultaneous NNLO fits of PDFs, the strong coupling $\alpha_s(M_Z)$ and
the top-quark mass, using the currently most precise experimental data on
$t\bar{t} + X$ total and multi-differential cross-sections from the LHC.
|
[
{
"created": "Thu, 9 Nov 2023 16:49:59 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Nov 2023 18:51:25 GMT",
"version": "v2"
},
{
"created": "Wed, 29 May 2024 21:19:35 GMT",
"version": "v3"
}
] |
2024-05-31
|
[
[
"Garzelli",
"M. V.",
""
],
[
"Mazzitelli",
"J.",
""
],
[
"Moch",
"S. -O.",
""
],
[
"Zenaiev",
"O.",
""
]
] |
We extract the top-quark mass value in the on-shell renormalization scheme from the comparison of theoretical predictions for $pp \rightarrow t\bar{t} + X$ at next-to-next-to-leading order (NNLO) QCD accuracy with experimental data collected by the ATLAS and CMS collaborations for absolute total, normalized single-differential and double-differential cross-sections during Run 1, Run 2 and the ongoing Run 3 at the Large Hadron Collider (LHC). For the theory computations of heavy-quark pair-production we use the MATRIX framework, interfaced to PineAPPL for the generation of grids of theory predictions, which can be efficiently used a-posteriori during the fit, performed within xFitter. We take several state-of-the-art parton distribution functions (PDFs) as input for the fit and evaluate their associated uncertainties, as well as the uncertainties arising from renormalization and factorization scale variation. Fit uncertainties related to the datasets are also part of the extracted uncertainty of the top-quark mass and turn out to be of similar size as the combined scale and PDF uncertainty. Fit results from different PDF sets agree among each other within 1$\sigma$ uncertainty, whereas some datasets related to $t\bar{t}$ decay in different channels (dileptonic vs. semileptonic) point towards top-quark mass values in slight tension among each other, although still compatible within $2.5 \sigma$ accuracy. Our results are compatible with the PDG 2022 top-quark pole-mass value. Our work opens the road towards more complex simultaneous NNLO fits of PDFs, the strong coupling $\alpha_s(M_Z)$ and the top-quark mass, using the currently most precise experimental data on $t\bar{t} + X$ total and multi-differential cross-sections from the LHC.
|
hep-ph/0608188
|
Hee-Jung Lee
|
Hee-Jung Lee, N.I. Kochelev
|
Instanton interpolating current for $\sigma$--tetraquark
|
11 pages, 7 figures, final version to be appeared in Phys. Lett. B
|
Phys.Lett.B642:358-365,2006
|
10.1016/j.physletb.2006.09.049
|
SNUTP/06-007
|
hep-ph hep-ex nucl-ex nucl-th
| null |
We perform a QCD sum rule analysis for the light scalar meson $\sigma$
($f_0(600)$) with a tetraquark current related to the instanton picture for QCD
vacuum. We demonstrate that instanton current, including equal weights of
scalar and pseudoscalar diquark-antidiquarks, leads to a strong cancelation
between the contributions of high dimension operators in the operator product
expansion (OPE). Furthermore, in the case of this current direct instanton
contributions do not spoil the sum rules. Our calculation, obtained from the
OPE up to dimension 10 operators, gives the mass of $\sigma$--meson around
780MeV.
|
[
{
"created": "Thu, 17 Aug 2006 07:10:01 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2006 05:35:13 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Oct 2006 06:37:42 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Lee",
"Hee-Jung",
""
],
[
"Kochelev",
"N. I.",
""
]
] |
We perform a QCD sum rule analysis for the light scalar meson $\sigma$ ($f_0(600)$) with a tetraquark current related to the instanton picture for QCD vacuum. We demonstrate that instanton current, including equal weights of scalar and pseudoscalar diquark-antidiquarks, leads to a strong cancelation between the contributions of high dimension operators in the operator product expansion (OPE). Furthermore, in the case of this current direct instanton contributions do not spoil the sum rules. Our calculation, obtained from the OPE up to dimension 10 operators, gives the mass of $\sigma$--meson around 780MeV.
|
hep-ph/9702421
| null |
Yuval Grossman and Howard E. Haber
|
Sneutrino Mixing Phenomena
|
12 pages, revtex + axodraw, 1 figure included. Minor changes
|
Phys.Rev.Lett. 78 (1997) 3438-3441
|
10.1103/PhysRevLett.78.3438
|
SLAC-PUB-7423, SCIPP 97/02
|
hep-ph
| null |
In any model with nonzero Majorana neutrino masses, the sneutrino and
antisneutrino of the supersymmetric extended theory mix. We outline the
conditions under which sneutrino-antisneutrino mixing is experimentally
observable. The mass-splitting of the sneutrino mass eigenstates and sneutrino
oscillation phenomena are considered.
|
[
{
"created": "Tue, 25 Feb 1997 21:47:42 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Mar 1997 18:26:33 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Grossman",
"Yuval",
""
],
[
"Haber",
"Howard E.",
""
]
] |
In any model with nonzero Majorana neutrino masses, the sneutrino and antisneutrino of the supersymmetric extended theory mix. We outline the conditions under which sneutrino-antisneutrino mixing is experimentally observable. The mass-splitting of the sneutrino mass eigenstates and sneutrino oscillation phenomena are considered.
|
hep-ph/0107015
|
Yuri V. Kovchegov
|
Yuri V. Kovchegov (U. of Washington), Mark Strikman (Penn State U.)
|
Ioffe Time in Double Logarithmic Approximation
|
13 pages, 1 figure
|
Phys.Lett.B516:314-320,2001
|
10.1016/S0370-2693(01)00953-4
|
NT@UW-01-015
|
hep-ph nucl-th
| null |
We analyze the light cone (Ioffe) time structure of the gluon distribution
function in the double logarithmic approximation. We show that due to QCD
evolution Ioffe equation is modified. The characteristic light cone time of the
gluons does not increase as fast with increasing energy (decreasing Bjorken x)
as predicted by the parton distributions exhibiting Bjorken scaling due to the
increase of the transverse momenta of the gluons in the DGLAP ladder.
|
[
{
"created": "Mon, 2 Jul 2001 21:34:43 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2001 01:13:26 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Kovchegov",
"Yuri V.",
"",
"U. of Washington"
],
[
"Strikman",
"Mark",
"",
"Penn State U."
]
] |
We analyze the light cone (Ioffe) time structure of the gluon distribution function in the double logarithmic approximation. We show that due to QCD evolution Ioffe equation is modified. The characteristic light cone time of the gluons does not increase as fast with increasing energy (decreasing Bjorken x) as predicted by the parton distributions exhibiting Bjorken scaling due to the increase of the transverse momenta of the gluons in the DGLAP ladder.
|
hep-ph/9803448
|
Yuichiro Kiyo
|
Yuichiro Kiyo, Jiro Kodaira and Hiroshi Tochimura
|
The Small $x$ Behavior of $g_1$ in the Resummed Approach
|
9 pages, ps figures included, sprocl.sty, psfig.sty, and here.sty are
required. Invited talk presented at the International Symposium on ``QCD
Corrections and New Physics'' October 27-29, 1997 Hiroshima, Japan
| null | null |
HUPD-9808
|
hep-ph
| null |
The double logarithmic terms $\alpha_{s} \ln^{2}x $ are important to predict
precisely the small $x$ behavior of the spin structure function $g_{1}$. We
numerically analyze the evolution of the flavor non-singlet $g_{1}$ including
the all-order resummed effect of these terms. It is pointed out that the
next-to-leading logarithmic corrections produce an unexpectedly large
suppression factor over the experimentally accessible range of $x$ and $Q^{2}$.
This implies that the next-to-leading logarithmic contributions are very
important in order to obtain a definite prediction.
|
[
{
"created": "Wed, 25 Mar 1998 17:10:07 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kiyo",
"Yuichiro",
""
],
[
"Kodaira",
"Jiro",
""
],
[
"Tochimura",
"Hiroshi",
""
]
] |
The double logarithmic terms $\alpha_{s} \ln^{2}x $ are important to predict precisely the small $x$ behavior of the spin structure function $g_{1}$. We numerically analyze the evolution of the flavor non-singlet $g_{1}$ including the all-order resummed effect of these terms. It is pointed out that the next-to-leading logarithmic corrections produce an unexpectedly large suppression factor over the experimentally accessible range of $x$ and $Q^{2}$. This implies that the next-to-leading logarithmic contributions are very important in order to obtain a definite prediction.
|
0807.2951
|
Elena Accomando
|
E. Accomando, S. De Curtis, D. Dominici and L. Fedeli (Florence U. &
INFN, Florence)
|
The four site Higgsless model at the LHC
|
To appear in the proceedings of the "Incontri di Fisica delle Alte
Energie" (IFAE 2008), Bologna, 26-28 March 2008
|
Nuovo Cim.B123:809-811,2008
|
10.1393/ncb/i2008-10609-4
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the four-site Higgsless model, which predicts the existence of
four charged and two neutral extra gauge bosons, $W_{1,2}^\pm$ and $Z_{1,2}$.
In contrast to other Higgsless models, characterized by fermiophobic extra
gauge bosons, here sizeable fermion-boson couplings are allowed by the
electroweak precision data. We thus analyse the prospects of detecting the new
predicted particles in the mostly favored Drell-Yan channel at the LHC.
|
[
{
"created": "Fri, 18 Jul 2008 13:59:58 GMT",
"version": "v1"
}
] |
2010-11-11
|
[
[
"Accomando",
"E.",
"",
"Florence U. &\n INFN, Florence"
],
[
"De Curtis",
"S.",
"",
"Florence U. &\n INFN, Florence"
],
[
"Dominici",
"D.",
"",
"Florence U. &\n INFN, Florence"
],
[
"Fedeli",
"L.",
"",
"Florence U. &\n INFN, Florence"
]
] |
We consider the four-site Higgsless model, which predicts the existence of four charged and two neutral extra gauge bosons, $W_{1,2}^\pm$ and $Z_{1,2}$. In contrast to other Higgsless models, characterized by fermiophobic extra gauge bosons, here sizeable fermion-boson couplings are allowed by the electroweak precision data. We thus analyse the prospects of detecting the new predicted particles in the mostly favored Drell-Yan channel at the LHC.
|
hep-ph/9504426
|
Tao Han
|
J. Bagger, V. Barger, K. Cheung, J. Gunion, T. Han, G. A. Ladinsky, R.
Rosenfeld, C.--P. Yuan
|
LHC Analysis of the Strongly Interacting $WW$ System: Gold-Plated Modes
|
14 pages, LaTeX, final version (with minor changes) to appear in
Phys. Rev. D; postscript file available via anonymous ftp at
ftp://ucdhep.ucdavis.edu/han/sews/paper_ww.ps and figure files separated as
figs.uu or *.ps
|
Phys.Rev.D52:3878-3889,1995
|
10.1103/PhysRevD.52.3878
|
JHU-TIPAC-95012, MADPH-95-877, CPP-95-3, DOE-ER40757-063, UCD-95-08,
MSUHEP-50305, IFUSP/P-1141
|
hep-ph
| null |
We study the gold-plated purely leptonic signal and background rates at the
LHC for the $ZZ,$ $W^{+}W^-,$ $W^\pm Z$ and $W^\pm W^\pm$ final states
associated with strongly interacting electroweak symmetry breaking. We work at
an energy of $\sqrt s = 14$ TeV, and develop a combination of back-to-back
leptonic, central-jet-vetoing and forwaring cuts that suppresses the
Standard-Model backgrounds. We find that the LHC with an annual luminosity of
100 fb$^{-1}$ will achieve a reasonably good sensitivity to the physics of
strongly interacting electroweak symmetry breaking.
|
[
{
"created": "Fri, 28 Apr 1995 23:54:01 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jul 1995 07:22:48 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bagger",
"J.",
""
],
[
"Barger",
"V.",
""
],
[
"Cheung",
"K.",
""
],
[
"Gunion",
"J.",
""
],
[
"Han",
"T.",
""
],
[
"Ladinsky",
"G. A.",
""
],
[
"Rosenfeld",
"R.",
""
],
[
"Yuan",
"C. --P.",
""
]
] |
We study the gold-plated purely leptonic signal and background rates at the LHC for the $ZZ,$ $W^{+}W^-,$ $W^\pm Z$ and $W^\pm W^\pm$ final states associated with strongly interacting electroweak symmetry breaking. We work at an energy of $\sqrt s = 14$ TeV, and develop a combination of back-to-back leptonic, central-jet-vetoing and forwaring cuts that suppresses the Standard-Model backgrounds. We find that the LHC with an annual luminosity of 100 fb$^{-1}$ will achieve a reasonably good sensitivity to the physics of strongly interacting electroweak symmetry breaking.
|
1506.05994
|
She-Sheng Xue
|
She-Sheng Xue
|
Vectorlike $W^\pm$-boson coupling at TeV and third family fermion masses
|
The revised version to appear in Phys. Rev. D. The title has been
modified. 23 pages and 5 figures
|
Phys. Rev. D 93, 073001 (2016)
|
10.1103/PhysRevD.93.073001
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the third fermion family and gauge symmetry of the Standard Model, we
study the quark-quark, lepton-lepton and quark-lepton four-fermion operators in
an effective theory at high energies. These operators have nontrivial
contributions to the Schwinger-Dyson equations for fermion self-energy
functions and the $W^\pm$-boson coupling vertex. As a result, the top-quark
mass is generated via the spontaneous symmetry breaking of $\langle\bar t t
\rangle$-condensate and the $W^\pm$-boson coupling becomes approximately
vectorlike at TeV scale. The bottom-quark, tau-lepton and tau-neutrino masses
are generated via the explicit symmetry breaking of $W^\pm$-contributions and
quark-lepton interactions. Their masses and Yukawa couplings are functions of
the top-quark mass and Yukawa coupling. We qualitatively show the hierarchy of
fermion masses and Yukawa couplings of the third fermion family. We also
discuss the possible collider signatures due to the vectorlike
(parity-restoration) feature of $W^\pm$-boson coupling at high energies.
|
[
{
"created": "Thu, 18 Jun 2015 17:26:15 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2015 07:48:42 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Mar 2016 10:36:38 GMT",
"version": "v3"
}
] |
2016-04-20
|
[
[
"Xue",
"She-Sheng",
""
]
] |
In the third fermion family and gauge symmetry of the Standard Model, we study the quark-quark, lepton-lepton and quark-lepton four-fermion operators in an effective theory at high energies. These operators have nontrivial contributions to the Schwinger-Dyson equations for fermion self-energy functions and the $W^\pm$-boson coupling vertex. As a result, the top-quark mass is generated via the spontaneous symmetry breaking of $\langle\bar t t \rangle$-condensate and the $W^\pm$-boson coupling becomes approximately vectorlike at TeV scale. The bottom-quark, tau-lepton and tau-neutrino masses are generated via the explicit symmetry breaking of $W^\pm$-contributions and quark-lepton interactions. Their masses and Yukawa couplings are functions of the top-quark mass and Yukawa coupling. We qualitatively show the hierarchy of fermion masses and Yukawa couplings of the third fermion family. We also discuss the possible collider signatures due to the vectorlike (parity-restoration) feature of $W^\pm$-boson coupling at high energies.
|
hep-ph/9810283
|
Kiselev Valery V.
|
V.V. Kiselev, A.I. Onishchenko
|
Two-loop anomalous dimensions for currents of baryons with two heavy
quarks in NRQCD
|
Latex file, 13 page, 1 postscript figure
| null | null |
IHEP 98-64
|
hep-ph
| null |
We present analytical results on the two-loop anomalous dimensions of
currents for baryons, containing two heavy quarks $J = [Q^{iT}C\Gamma\tau
Q^j]\Gamma' q^k\epsilon_{ijk}$ with arbitrary Dirac matrices $\Gamma$ and
$\Gamma'$ in the framework of NRQCD in the leading order over both the relative
velocity of heavy quarks and the inverse heavy quark mass. It is shown, that in
this approximation the anomalous dimensions do not depend on the Dirac
structure of the current under consideration.
|
[
{
"created": "Thu, 8 Oct 1998 04:54:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kiselev",
"V. V.",
""
],
[
"Onishchenko",
"A. I.",
""
]
] |
We present analytical results on the two-loop anomalous dimensions of currents for baryons, containing two heavy quarks $J = [Q^{iT}C\Gamma\tau Q^j]\Gamma' q^k\epsilon_{ijk}$ with arbitrary Dirac matrices $\Gamma$ and $\Gamma'$ in the framework of NRQCD in the leading order over both the relative velocity of heavy quarks and the inverse heavy quark mass. It is shown, that in this approximation the anomalous dimensions do not depend on the Dirac structure of the current under consideration.
|
hep-ph/9510433
|
Csaba Boros
|
C.Boros
|
New results of the Berliner relativistic quark model
|
Plenary talk given at the VI. International Workshop on Spin
Phenomena in High Energy Physics, Protvino, Russia September 18-23
| null | null |
FUB-HEP/95-16
|
hep-ph
| null |
It is pointed out that the recently measured left-right asymmetries in
inclusive pion and lambda hyperon production processes are in very good
agreement with the relativistic quark model, proposed some time ago. Further
predictions based on this model for hyperon productions, for lepton pair
productions and for W/Z-boson productions are also presented.
|
[
{
"created": "Fri, 27 Oct 1995 14:44:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Boros",
"C.",
""
]
] |
It is pointed out that the recently measured left-right asymmetries in inclusive pion and lambda hyperon production processes are in very good agreement with the relativistic quark model, proposed some time ago. Further predictions based on this model for hyperon productions, for lepton pair productions and for W/Z-boson productions are also presented.
|
1610.04501
|
Tord Riemann
|
T. Riemann (Koenigs Wusterhausen)
|
S-matrix approach to the Z resonance
|
10 pages, Proceedings of 39th International Conference of Theoretical
Physics: Matter to the Deepest, Recent Developments in Physics of Fundamental
Interactions, 13-18 September 2015, Ustron, Poland; presented also at the
FCC-ee meeting, February 2015, Pisa; at CALC, July 2015, JINR, Dubna; at
HEPKIT, October 2015, KIT, Karlsruhe. Note added on 14 October 2016
|
Acta Phys. Polon. B46 (2015) no.11, 2235
|
10.5506/APhysPolB.46.2235
|
KW 15-001
|
hep-ph
|
http://creativecommons.org/licenses/by-sa/4.0/
|
The proposed $e^+e^-$-collider FCC-ee aims at an unprecedented accuracy for
$e^+e^-$ collisions into fermion pairs at the $Z$ peak, based on about
$10^{13}$ events. The S-matrix approach to the $Z$ boson line shape allows the
model-independent quantitative description of the reaction $e^+e^- \to {\bar
f}f$ around the $Z$ peak in terms of few parameters, among them the mass $M_Z$
and width $\Gamma_Z$ of the $Z$-boson. While weak and strong corrections remain
"black", a careful theoretical description of the photonic interactions is
mandatory. I introduce the method and describe applications and the analysis
tool SMATASY/ZFITTER.
|
[
{
"created": "Fri, 14 Oct 2016 15:32:19 GMT",
"version": "v1"
}
] |
2016-10-17
|
[
[
"Riemann",
"T.",
"",
"Koenigs Wusterhausen"
]
] |
The proposed $e^+e^-$-collider FCC-ee aims at an unprecedented accuracy for $e^+e^-$ collisions into fermion pairs at the $Z$ peak, based on about $10^{13}$ events. The S-matrix approach to the $Z$ boson line shape allows the model-independent quantitative description of the reaction $e^+e^- \to {\bar f}f$ around the $Z$ peak in terms of few parameters, among them the mass $M_Z$ and width $\Gamma_Z$ of the $Z$-boson. While weak and strong corrections remain "black", a careful theoretical description of the photonic interactions is mandatory. I introduce the method and describe applications and the analysis tool SMATASY/ZFITTER.
|
2209.13741
|
Joris Vergeest
|
Bartosz Dziewit, Marek Zralek, Joris Vergeest and Piotr Chaber
|
A method to explore flavor symmetries of the 3HDM and their implications
on lepton masses and mixing
|
arXiv admin note: text overlap with arXiv:2203.03514
|
Symmetry 2022, 14(9), 185
| null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a method to identify symmetry groups of the Yukawa sector of the
three-Higgs-doublet model and to determine the implication that the symmetry
has on the lepton masses and mixing. The method can accommodate different
hypotheses about the group representation assignments, and thus support the
exploration of candidate symmetry groups. For one particular representation
selection scheme we apply the computer-implemented method to scan all discrete
groups of order less than 1035. It can be proven that none of these groups
defines a flavor symmetry that implies masses and neutrino mixing angles
consistent with the experimental lepton data, although several cases are found
that are partially or approximately consistent.
|
[
{
"created": "Tue, 27 Sep 2022 23:24:45 GMT",
"version": "v1"
}
] |
2022-09-29
|
[
[
"Dziewit",
"Bartosz",
""
],
[
"Zralek",
"Marek",
""
],
[
"Vergeest",
"Joris",
""
],
[
"Chaber",
"Piotr",
""
]
] |
We present a method to identify symmetry groups of the Yukawa sector of the three-Higgs-doublet model and to determine the implication that the symmetry has on the lepton masses and mixing. The method can accommodate different hypotheses about the group representation assignments, and thus support the exploration of candidate symmetry groups. For one particular representation selection scheme we apply the computer-implemented method to scan all discrete groups of order less than 1035. It can be proven that none of these groups defines a flavor symmetry that implies masses and neutrino mixing angles consistent with the experimental lepton data, although several cases are found that are partially or approximately consistent.
|
hep-ph/0207279
|
Bodenm\"uller
|
H. Fritzsch
|
Mesons, Quarks and Leptons
|
15 pages
| null | null |
LMU 08/01
|
hep-ph
| null |
The QCD anomaly leads to an abnormal mixing and mass pattern for the
pseudoscalar mesons. Furthermore it is responsible for the quality of isospin
symmetry in the meson spectrum. Similarities between the large mixing angles
among the neutral 0^-+ mesons and the large mixing angles observed in neutrino
oscillations are pointed out.
|
[
{
"created": "Tue, 23 Jul 2002 13:04:32 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Fritzsch",
"H.",
""
]
] |
The QCD anomaly leads to an abnormal mixing and mass pattern for the pseudoscalar mesons. Furthermore it is responsible for the quality of isospin symmetry in the meson spectrum. Similarities between the large mixing angles among the neutral 0^-+ mesons and the large mixing angles observed in neutrino oscillations are pointed out.
|
1203.4435
|
Emiliano Molinaro
|
A. Meroni, E. Molinaro, S. T. Petcov
|
Revisiting Leptogenesis in a SUSY SU(5) x T' Model of Flavour
|
14 pages, 1 figure; published version
| null |
10.1016/j.physletb.2012.03.006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the generation of the baryon asymmetry of the Universe within
a SUSY SU(5) x T' model of flavour, which gives rise to realistic masses and
mixing patterns for quarks and leptons. The model employs the see-saw mechanism
for generation of the light neutrino masses and the baryon asymmetry is
produced via leptogenesis. We perform detailed calculations of both the CP
violating lepton asymmetries, originating from the decays of the heavy Majorana
neutrinos operative in the see-saw mechanism, and of the efficiency factors
which account for the lepton asymmetry wash-out processes in the Early
Universe. The latter are calculated by solving numerically the system of
Boltzmann equations describing the generation and the evolution of the lepton
asymmetries. The baryon asymmetry in the model considered is proportional to
the J_{CP} factor, which determines the magnitude of CP violation effects in
the oscillations of flavour neutrinos. The leptogenesis scale can be
sufficiently low, allowing to avoid the potential gravitino problem.
|
[
{
"created": "Tue, 20 Mar 2012 13:43:04 GMT",
"version": "v1"
}
] |
2012-03-21
|
[
[
"Meroni",
"A.",
""
],
[
"Molinaro",
"E.",
""
],
[
"Petcov",
"S. T.",
""
]
] |
We investigate the generation of the baryon asymmetry of the Universe within a SUSY SU(5) x T' model of flavour, which gives rise to realistic masses and mixing patterns for quarks and leptons. The model employs the see-saw mechanism for generation of the light neutrino masses and the baryon asymmetry is produced via leptogenesis. We perform detailed calculations of both the CP violating lepton asymmetries, originating from the decays of the heavy Majorana neutrinos operative in the see-saw mechanism, and of the efficiency factors which account for the lepton asymmetry wash-out processes in the Early Universe. The latter are calculated by solving numerically the system of Boltzmann equations describing the generation and the evolution of the lepton asymmetries. The baryon asymmetry in the model considered is proportional to the J_{CP} factor, which determines the magnitude of CP violation effects in the oscillations of flavour neutrinos. The leptogenesis scale can be sufficiently low, allowing to avoid the potential gravitino problem.
|
1303.1822
|
Jihn E. Kim
|
Jihn E. Kim
|
Natural Higgs-flavor-democracy solution of the mu problem of
supersymmetry and the QCD axion
| null | null |
10.1103/PhysRevLett.111.031801
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the hierarchically small mu term in supersymmetric theories is a
consequence of two identical pairs of Higgs doublets taking a democratic form
for their mass matrix. We briefly discuss the discrete symmetry S2xS2 toward
the democratic mass matrix. Then, we show that there results an approximate
Peccei-Quinn symmetry and hence the value mu is related to the axion decay
constant.
|
[
{
"created": "Thu, 7 Mar 2013 21:00:06 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2013 06:07:58 GMT",
"version": "v2"
}
] |
2017-03-22
|
[
[
"Kim",
"Jihn E.",
""
]
] |
We show that the hierarchically small mu term in supersymmetric theories is a consequence of two identical pairs of Higgs doublets taking a democratic form for their mass matrix. We briefly discuss the discrete symmetry S2xS2 toward the democratic mass matrix. Then, we show that there results an approximate Peccei-Quinn symmetry and hence the value mu is related to the axion decay constant.
|
hep-ph/0111044
|
Alessandro Drago
|
M.Anselmino, V.Barone, A.Drago and F.Murgia
|
Non-Standard Time Reversal for Particle Multiplets and the Spin-Flavor
Structure of Hadrons
|
2 pages, proceedings of "The Spin Structure of the Proton", ECT -
Trento, July 2001. Eds. S Bass, A De Roeck and A Deshpande
|
Nucl.Phys.Proc.Suppl. 105 (2002) 132-133
|
10.1016/S0920-5632(01)01967-3
| null |
hep-ph
| null |
We show that a system of quarks interacting with chiral fields provides a
physical representation of a ``non-standard'' time reversal for particle
multiplets proposed by Weinberg. As an application, we argue that, if the
internal structure of hadrons is described by a chiral lagrangian, the
so-called time-reversal-odd quark distribution functions might not be forbidden
by time-reversal invariance.
|
[
{
"created": "Mon, 5 Nov 2001 18:34:59 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Anselmino",
"M.",
""
],
[
"Barone",
"V.",
""
],
[
"Drago",
"A.",
""
],
[
"Murgia",
"F.",
""
]
] |
We show that a system of quarks interacting with chiral fields provides a physical representation of a ``non-standard'' time reversal for particle multiplets proposed by Weinberg. As an application, we argue that, if the internal structure of hadrons is described by a chiral lagrangian, the so-called time-reversal-odd quark distribution functions might not be forbidden by time-reversal invariance.
|
1205.6628
|
Ulf-G. Mei{\ss}ner
|
I. T. Lorenz, H.-W. Hammer, Ulf-G. Mei{\ss}ner
|
The size of the proton - closing in on the radius puzzle
|
4 pages, 2 figures, fit improved, small modifications, section on
continued fractions modified, conclusions on the proton charge radius
unchanged, version accepted for publication in European Physical Journal A
|
Eur. Phys. J. A, 48 11 (2012) 151
|
10.1140/epja/i2012-12151-1
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the recent electron-proton scattering data from Mainz using a
dispersive framework that respects the constraints from analyticity and
unitarity on the nucleon structure. We also perform a continued fraction
analysis of these data. We find a small electric proton charge radius, r_E^p =
0.84_{-0.01}^{+0.01} fm, consistent with the recent determination from muonic
hydrogen measurements and earlier dispersive analyses. We also extract the
proton magnetic radius, r_M^p = 0.86_{-0.03}^{+0.02} fm, consistent with
earlier determinations based on dispersion relations.
|
[
{
"created": "Wed, 30 May 2012 10:55:49 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Oct 2012 08:52:49 GMT",
"version": "v2"
}
] |
2012-11-07
|
[
[
"Lorenz",
"I. T.",
""
],
[
"Hammer",
"H. -W.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] |
We analyze the recent electron-proton scattering data from Mainz using a dispersive framework that respects the constraints from analyticity and unitarity on the nucleon structure. We also perform a continued fraction analysis of these data. We find a small electric proton charge radius, r_E^p = 0.84_{-0.01}^{+0.01} fm, consistent with the recent determination from muonic hydrogen measurements and earlier dispersive analyses. We also extract the proton magnetic radius, r_M^p = 0.86_{-0.03}^{+0.02} fm, consistent with earlier determinations based on dispersion relations.
|
hep-ph/0103036
|
Zhang Zhao-xi
|
Chao-Hsi Chang, Yu-Qi Chen, Guo-Li Wang and Hong-Shi Zong
|
Decays of the Meson $B_c$ to a $P$-Wave Charmonium State $\chi_c$ or
$h_c$
|
24 pages, 3 figures, the replacement for improving the presentation
and adding references
|
Phys.Rev.D65:014017,2002
|
10.1103/PhysRevD.65.014017
| null |
hep-ph
| null |
The semileptonic decays,
$B_{c}{\longrightarrow}{\chi_c}(h_c)+{\ell}+{{\nu}}_{\ell}$, and the two-body
nonleptonic decays, $B_{c}{\longrightarrow}{\chi_c}(h_c)+h$, (here $\chi_c$ and
$h_c$ denote $(c\bar c[^3P_J])$ and $(c\bar c[^1P_1])$ respectively, and $h$
indicates a meson) were computed. All of the form factors appearing in the
relevant weak-current matrix elements with $B_c$ as its initial state and a
$P$-wave charmonium state as its final state for the decays were precisely
formulated in terms of two independent overlapping-integrations of the
wave-functions of $B_c$ and the $P$-wave charmonium and with proper kinematics
factors being `accompanied'. We found that the decays are quite sizable, so
they may be accessible in Run-II at Tevatron and in the foreseen future at LHC,
particularly, when BTeV and LHCB, the special detectors for B-physics, are
borne in mind. In addition, we also pointed out that the decays $B_c\to
h_c+...$ may potentially be used as a fresh window to look for the $h_c$
charmonium state, and the cascade decays, $B_c\to \chi_c[^3P_{1,2}]+l+\nu_l$
($B_c\to \chi_c[^3P_{1,2}]+h$) with one of the radiative decays
$\chi_c[^3P_{1,2}] \to J/\psi+\gamma$ being followed accordingly, may affect
the observations of $B_c$ meson through the decays $B_{c}\to
{J/\psi}+{l}+\nu_{l}$ ($B_c\to J/\psi+h$) substantially.
|
[
{
"created": "Sat, 3 Mar 2001 10:45:01 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2001 03:43:00 GMT",
"version": "v2"
}
] |
2011-03-23
|
[
[
"Chang",
"Chao-Hsi",
""
],
[
"Chen",
"Yu-Qi",
""
],
[
"Wang",
"Guo-Li",
""
],
[
"Zong",
"Hong-Shi",
""
]
] |
The semileptonic decays, $B_{c}{\longrightarrow}{\chi_c}(h_c)+{\ell}+{{\nu}}_{\ell}$, and the two-body nonleptonic decays, $B_{c}{\longrightarrow}{\chi_c}(h_c)+h$, (here $\chi_c$ and $h_c$ denote $(c\bar c[^3P_J])$ and $(c\bar c[^1P_1])$ respectively, and $h$ indicates a meson) were computed. All of the form factors appearing in the relevant weak-current matrix elements with $B_c$ as its initial state and a $P$-wave charmonium state as its final state for the decays were precisely formulated in terms of two independent overlapping-integrations of the wave-functions of $B_c$ and the $P$-wave charmonium and with proper kinematics factors being `accompanied'. We found that the decays are quite sizable, so they may be accessible in Run-II at Tevatron and in the foreseen future at LHC, particularly, when BTeV and LHCB, the special detectors for B-physics, are borne in mind. In addition, we also pointed out that the decays $B_c\to h_c+...$ may potentially be used as a fresh window to look for the $h_c$ charmonium state, and the cascade decays, $B_c\to \chi_c[^3P_{1,2}]+l+\nu_l$ ($B_c\to \chi_c[^3P_{1,2}]+h$) with one of the radiative decays $\chi_c[^3P_{1,2}] \to J/\psi+\gamma$ being followed accordingly, may affect the observations of $B_c$ meson through the decays $B_{c}\to {J/\psi}+{l}+\nu_{l}$ ($B_c\to J/\psi+h$) substantially.
|
1002.4538
|
Sylvie Flores
|
M. Martini (IPNL, Cea/Dam), M. Ericson (IPNL, CERN), G. Chanfray
(IPNL), J. Marteau (IPNL)
|
Neutrino and antineutrino quasielastic interactions with nuclei
| null |
Physical Review C 81 (2010) 045502
|
10.1103/PhysRevC.81.045502
|
CERN-PH-TH/2010-046, LYCEN 2010-03
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the interaction of neutrinos and antineutrinos with nuclei. We
explore in particular the role played by the multinucleon excitations which can
contaminate the quasielastic cross section. For neutrinos the multinucleon term
produces a sizable increase of the quasielastic cross section. Part of the
effect arises from tensor correlations. For antineutrinos this influence is
smaller owing to the axial-vector interference which increases the relative
importance of the terms which are not affected by these multinucleon
excitations.
|
[
{
"created": "Wed, 24 Feb 2010 12:49:03 GMT",
"version": "v1"
}
] |
2012-08-21
|
[
[
"Martini",
"M.",
"",
"IPNL, Cea/Dam"
],
[
"Ericson",
"M.",
"",
"IPNL, CERN"
],
[
"Chanfray",
"G.",
"",
"IPNL"
],
[
"Marteau",
"J.",
"",
"IPNL"
]
] |
We investigate the interaction of neutrinos and antineutrinos with nuclei. We explore in particular the role played by the multinucleon excitations which can contaminate the quasielastic cross section. For neutrinos the multinucleon term produces a sizable increase of the quasielastic cross section. Part of the effect arises from tensor correlations. For antineutrinos this influence is smaller owing to the axial-vector interference which increases the relative importance of the terms which are not affected by these multinucleon excitations.
|
hep-ph/0611201
|
Baier
|
V. N. Baier
|
Forty years of acting electron-positron colliders
|
32 pages, 5 figures
| null | null | null |
hep-ph
| null |
Around forty years passed from the beginning of operation of the first
electron-positron colliding beam facility VEPP-2 in Institute of Nuclear
Physics (INP), Novosibirsk. Here I described development of electron-positron
colliding beam project in INP, as well as advance of similar projects of the
first generation at LAL, Orsay and at LNF, Frascati.
|
[
{
"created": "Wed, 15 Nov 2006 09:31:25 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Baier",
"V. N.",
""
]
] |
Around forty years passed from the beginning of operation of the first electron-positron colliding beam facility VEPP-2 in Institute of Nuclear Physics (INP), Novosibirsk. Here I described development of electron-positron colliding beam project in INP, as well as advance of similar projects of the first generation at LAL, Orsay and at LNF, Frascati.
|
hep-ph/9802295
|
Hiroshi Nunokawa
|
Hiroshi Nunokawa
|
Supernova Bounds on Neutrino Properties: a mini-review
|
Latex file, 8 pages, 11 ps figures, Talk given in Valencia 97:
International Workshop on "Physics Beyond the Standard Model: from Theory to
Experiment" Oct. 13-17, 1997, Valencia, Spain
| null | null |
FTUV/98-15, IFIC/98-15
|
hep-ph astro-ph
| null |
This talk summarizes our recent work which studied the impact of resonant
neutrino conversion induced by some non-standard neutrino properties beyond
mass and mixing, such as neutrino magnetic moment, lepton-flavor
non-universality as well as flavor changing neutral current interactions in
SUSY models with broken R parity, on supernova physics.
|
[
{
"created": "Tue, 10 Feb 1998 23:04:35 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Nunokawa",
"Hiroshi",
""
]
] |
This talk summarizes our recent work which studied the impact of resonant neutrino conversion induced by some non-standard neutrino properties beyond mass and mixing, such as neutrino magnetic moment, lepton-flavor non-universality as well as flavor changing neutral current interactions in SUSY models with broken R parity, on supernova physics.
|
hep-ph/9805373
|
Apostolos Pilaftsis
|
Apostolos Pilaftsis (MPI, Munich)
|
Higgs Scalar-Pseudoscalar Mixing in the Minimal Supersymmetric Standard
Model
|
17 pages, LaTeX, 3 encapsulated figures included
|
Phys.Lett.B435:88-100,1998
|
10.1016/S0370-2693(98)00771-0
|
MPI-PhT/98-38
|
hep-ph
| null |
In the minimal supersymmetric Standard Model, the heaviest CP-even Higgs
boson H and the CP-odd Higgs scalar A are predicted to be almost degenerate in
mass at the tree level, for the wide kinematic range M_A > 2M_Z and \tan\beta
\ge 2. However, if large soft-CP-violating Yukawa interactions involving scalar
quarks of the third generation are present in the theory, then the CP
invariance of the Higgs potential can be maximally broken beyond the Born
approximation, and the high degree of mass degeneracy between H and A may be
lifted through a sizeable HA mixing. After taking the CP-odd tadpole
renormalization of the A boson into account, we find that the small mass
difference M_H - M_A, which is about 1% of the A-boson mass at the tree level,
can be substantially enhanced to the 25% level at the one-loop order. We also
find that the loop-induced mixing between the lightest CP-even Higgs boson h
and the A boson may be of comparable size to M_h. We briefly discuss the main
phenomenological implications of the predicted hA and HA mixings for the
general Higgs-boson mass spectrum and for CP-violating observables at collider
and lower energies.
|
[
{
"created": "Tue, 19 May 1998 10:04:41 GMT",
"version": "v1"
}
] |
2011-01-27
|
[
[
"Pilaftsis",
"Apostolos",
"",
"MPI, Munich"
]
] |
In the minimal supersymmetric Standard Model, the heaviest CP-even Higgs boson H and the CP-odd Higgs scalar A are predicted to be almost degenerate in mass at the tree level, for the wide kinematic range M_A > 2M_Z and \tan\beta \ge 2. However, if large soft-CP-violating Yukawa interactions involving scalar quarks of the third generation are present in the theory, then the CP invariance of the Higgs potential can be maximally broken beyond the Born approximation, and the high degree of mass degeneracy between H and A may be lifted through a sizeable HA mixing. After taking the CP-odd tadpole renormalization of the A boson into account, we find that the small mass difference M_H - M_A, which is about 1% of the A-boson mass at the tree level, can be substantially enhanced to the 25% level at the one-loop order. We also find that the loop-induced mixing between the lightest CP-even Higgs boson h and the A boson may be of comparable size to M_h. We briefly discuss the main phenomenological implications of the predicted hA and HA mixings for the general Higgs-boson mass spectrum and for CP-violating observables at collider and lower energies.
|
hep-ph/9806435
|
Kacper Zalewski
|
A. Bialas and K. Zalewski (Jagellonian University, Cracow, Poland)
|
Bose-Einstein condensation and independent production of pions
|
10 pages Latex, one figure as an EPS file
|
Phys.Lett. B436 (1998) 153-157
|
10.1016/S0370-2693(98)00837-5
| null |
hep-ph
| null |
The influence of the HBT effect on the momentum spectra of independently
produced pions is studied using the method developed earlier for discussion of
multiplicity distributions. It is shown that in this case all the spectra and
multiparticle correlation functions are expressible in terms of one function of
two momenta. It is also shown that at the critical point all pions are
attracted into one quantum state and thus form a Bose-Einstein condensate.
|
[
{
"created": "Mon, 22 Jun 1998 10:35:45 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Bialas",
"A.",
"",
"Jagellonian University, Cracow, Poland"
],
[
"Zalewski",
"K.",
"",
"Jagellonian University, Cracow, Poland"
]
] |
The influence of the HBT effect on the momentum spectra of independently produced pions is studied using the method developed earlier for discussion of multiplicity distributions. It is shown that in this case all the spectra and multiparticle correlation functions are expressible in terms of one function of two momenta. It is also shown that at the critical point all pions are attracted into one quantum state and thus form a Bose-Einstein condensate.
|
hep-ph/0403183
|
Stephen West
|
Thomas Hambye, John March-Russell, Stephen M. West
|
TeV scale resonant leptogenesis from supersymmetry breaking
|
10 Pages latex, version for JHEP
|
JHEP 0407 (2004) 070
|
10.1088/1126-6708/2004/07/070
|
OUTP-04/09
|
hep-ph
| null |
We propose a model of TeV-scale resonant leptogenesis based upon recent
models of the generation of light neutrino masses from supersymmetry-breaking
effects with TeV-scale right-handed (rhd) neutrinos, $N_i$. The model leads to
naturally large cosmological lepton asymmetries via the resonant behaviour of
the one-loop self-energy contribution to $N_i$ decay. Our model addresses the
primary problems of previous phenomenological studies of low-energy
leptogenesis: a rational for TeV-scale rhd neutrinos with small Yukawa
couplings so that the out-of equilibrium condition for $N_i$ decay is
satisfied; the origin of the tiny, but non-zero mass splitting required between
at least two $N_i$ masses; and the necessary non-trivial breaking of flavour
symmetries in the rhd neutrino sector. The low mass-scale of the rhd neutrinos
and their superpartners, and the TeV-scale $A$-terms automatically contained
within the model offer opportunities for partial direct experimental tests of
this leptogenesis mechanism at future colliders.
|
[
{
"created": "Tue, 16 Mar 2004 18:58:09 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2004 12:43:32 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Hambye",
"Thomas",
""
],
[
"March-Russell",
"John",
""
],
[
"West",
"Stephen M.",
""
]
] |
We propose a model of TeV-scale resonant leptogenesis based upon recent models of the generation of light neutrino masses from supersymmetry-breaking effects with TeV-scale right-handed (rhd) neutrinos, $N_i$. The model leads to naturally large cosmological lepton asymmetries via the resonant behaviour of the one-loop self-energy contribution to $N_i$ decay. Our model addresses the primary problems of previous phenomenological studies of low-energy leptogenesis: a rational for TeV-scale rhd neutrinos with small Yukawa couplings so that the out-of equilibrium condition for $N_i$ decay is satisfied; the origin of the tiny, but non-zero mass splitting required between at least two $N_i$ masses; and the necessary non-trivial breaking of flavour symmetries in the rhd neutrino sector. The low mass-scale of the rhd neutrinos and their superpartners, and the TeV-scale $A$-terms automatically contained within the model offer opportunities for partial direct experimental tests of this leptogenesis mechanism at future colliders.
|
1301.4965
|
Bruce Mellado
|
A. Djouadi, R.M. Godbole, B. Mellado and K. Mohan
|
Probing the spin-parity of the Higgs boson via jet kinematics in vector
boson fusion
|
15 pages, 5 figures
|
Physics Letters B 723 (2013), pp. 307-313
|
10.1016/j.physletb.2013.04.060
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Determining the spin and the parity quantum numbers of the recently
discovered Higgs-like boson at the LHC is a matter of great importance. In this
paper, we consider the possibility of using the kinematics of the tagging jets
in Higgs production via the vector boson fusion (VBF) process to test the
tensor structure of the Higgs-vector boson ($HVV$) interaction and to determine
the spin and CP properties of the observed resonance. We show that an anomalous
$HVV$ vertex, in particular its explicit momentum dependence, drastically
affects the rapidity between the two scattered quarks and their transverse
momenta and, hence, the acceptance of the kinematical cuts that allow to select
the VBF topology. The sensitivity of these observables to different spin-parity
assignments, including the dependence on the LHC center of mass energy, are
evaluated. In addition, we show that in associated Higgs production with a
vector boson some kinematical variables, such as the invariant mass of the
system and the transverse momenta of the two bosons and their separation in
rapidity, are also sensitive to the spin--parity assignments of the Higgs--like
boson.
|
[
{
"created": "Mon, 21 Jan 2013 19:15:15 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2013 20:08:30 GMT",
"version": "v2"
}
] |
2015-06-12
|
[
[
"Djouadi",
"A.",
""
],
[
"Godbole",
"R. M.",
""
],
[
"Mellado",
"B.",
""
],
[
"Mohan",
"K.",
""
]
] |
Determining the spin and the parity quantum numbers of the recently discovered Higgs-like boson at the LHC is a matter of great importance. In this paper, we consider the possibility of using the kinematics of the tagging jets in Higgs production via the vector boson fusion (VBF) process to test the tensor structure of the Higgs-vector boson ($HVV$) interaction and to determine the spin and CP properties of the observed resonance. We show that an anomalous $HVV$ vertex, in particular its explicit momentum dependence, drastically affects the rapidity between the two scattered quarks and their transverse momenta and, hence, the acceptance of the kinematical cuts that allow to select the VBF topology. The sensitivity of these observables to different spin-parity assignments, including the dependence on the LHC center of mass energy, are evaluated. In addition, we show that in associated Higgs production with a vector boson some kinematical variables, such as the invariant mass of the system and the transverse momenta of the two bosons and their separation in rapidity, are also sensitive to the spin--parity assignments of the Higgs--like boson.
|
hep-ph/9512279
| null |
D.V.Anchishkin, W.A.Zajc, G.M.Zinovjev
|
Coulomb Final State Interaction in Pion Interferometry for the Processes
of High Multiplicity
|
9 pages, LaTeX file and 5 uuencoded gzipped PostScript figures (Fig.
No.2 contains Fig.2a and Fig.2b)
| null | null |
Preprint University of Jyvaskyla, JYFL 14/95
|
hep-ph
| null |
The corrections for two pion correlations due to electromagnetic final state
interactions at high secondary multiplicities are investigated. It is shown
that these result in a noticeable deviation from the standard Gamov factor.
This conclusion changes drastically in a model of the pion system with
expansion. The critical parameter which determines the size of these effects is
found to be the ratio of the relative velocity of detected pions to the
velocity of the pair center-of-mass (in the fireball rest frame). In
particular, when this parameter is much less than unity the pion pair escapes
the initial high density region promptly and the distortion of the mutual
Coulomb potential is weak.
|
[
{
"created": "Mon, 11 Dec 1995 19:28:00 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Dec 1995 12:54:00 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Anchishkin",
"D. V.",
""
],
[
"Zajc",
"W. A.",
""
],
[
"Zinovjev",
"G. M.",
""
]
] |
The corrections for two pion correlations due to electromagnetic final state interactions at high secondary multiplicities are investigated. It is shown that these result in a noticeable deviation from the standard Gamov factor. This conclusion changes drastically in a model of the pion system with expansion. The critical parameter which determines the size of these effects is found to be the ratio of the relative velocity of detected pions to the velocity of the pair center-of-mass (in the fireball rest frame). In particular, when this parameter is much less than unity the pion pair escapes the initial high density region promptly and the distortion of the mutual Coulomb potential is weak.
|
0812.4092
|
Qiang Zhao
|
Qiang Zhao, Gang Li, and Chao-Hsi Chang
|
Further insights into the "$\rho\pi$ puzzle"
|
7 pages, 2 figures, proceeding of "The Conference on
Interdisciplinary Fields of Particle Physics, Nuclear Physics and Cosmology",
Aug. 2-4, 2008, Yunnan, China
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on a systematic investigation of $J/\psi(\psi^\prime)\to VP$, where $V$
and $P$ stand for light vector and pseudoscalar mesons, we identify the role
played by the electromagnetic (EM) transitions and intermediate meson loop
transitions, which are essential ingredients for understanding the $J/\psi$ and
$\psi^\prime$ couplings to $VP$. We show that on the one hand, the EM
transitions have relatively larger interferences in $\psi^\prime\to \rho\pi$
and $K^*\bar{K}+c.c.$ as explicitly shown by vector meson dominance (VMD). On
the other hand, the strong decay of $\psi^\prime$ receives relatively larger
destructive interferences from the intermediate meson loop transitions. By
identifying these mechanisms in an overall study of $J/\psi(\psi^\prime)\to
VP$, we provide a coherent understanding of the so-called "$\rho\pi$ puzzle".
|
[
{
"created": "Mon, 22 Dec 2008 04:51:12 GMT",
"version": "v1"
}
] |
2008-12-24
|
[
[
"Zhao",
"Qiang",
""
],
[
"Li",
"Gang",
""
],
[
"Chang",
"Chao-Hsi",
""
]
] |
Based on a systematic investigation of $J/\psi(\psi^\prime)\to VP$, where $V$ and $P$ stand for light vector and pseudoscalar mesons, we identify the role played by the electromagnetic (EM) transitions and intermediate meson loop transitions, which are essential ingredients for understanding the $J/\psi$ and $\psi^\prime$ couplings to $VP$. We show that on the one hand, the EM transitions have relatively larger interferences in $\psi^\prime\to \rho\pi$ and $K^*\bar{K}+c.c.$ as explicitly shown by vector meson dominance (VMD). On the other hand, the strong decay of $\psi^\prime$ receives relatively larger destructive interferences from the intermediate meson loop transitions. By identifying these mechanisms in an overall study of $J/\psi(\psi^\prime)\to VP$, we provide a coherent understanding of the so-called "$\rho\pi$ puzzle".
|
hep-ph/9604304
|
Jan Pisut
|
Jan Ftacnik (Bratislava),Jan Pisut (Clermont-Ferrand and Bratislava),
Neva Pisutova (Bratislava)
|
Contribution of intermediate stage gluons to J/Psi suppression in
Lead-Lead collisions at 158 AGeV
|
17 pp,Latex, 1 Table in Latex,1 Fig. in Latex, amended computations,
conclusions unchanged, instead of "pre- equilibrium gluons" we refer to less
ambiguous "intermediate stage gluons"
| null | null |
Revised version, Comenius University Bratislava, preprint
|
hep-ph
| null |
We point out that dissociation of J/Psi by partons (mostly gluons) present in
the intermediate stage of heavy-ion collisions can explain J/Psi suppression
observed recently by the NA-50 Collaboration at the CERN-SPS in Pb-Pb
interactions. Suppression by intermediate stage gluons represents an additional
multiplicative factor to that given by Gerschel-Hufner mechanism. The agreement
with data on J/Psi suppression both in light- ions induced nuclear collisions
and in Pb-Pb interactions requires that the life-time of intermediate gluons
increases with nucleon numbers of colliding nuclei. In our model the energy
density of intermediate stage gluons in Pb-Pb collisions approaches for a short
time the critical density.
|
[
{
"created": "Fri, 12 Apr 1996 13:28:41 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 1996 22:03:57 GMT",
"version": "v2"
}
] |
2016-09-01
|
[
[
"Ftacnik",
"Jan",
"",
"Bratislava"
],
[
"Pisut",
"Jan",
"",
"Clermont-Ferrand and Bratislava"
],
[
"Pisutova",
"Neva",
"",
"Bratislava"
]
] |
We point out that dissociation of J/Psi by partons (mostly gluons) present in the intermediate stage of heavy-ion collisions can explain J/Psi suppression observed recently by the NA-50 Collaboration at the CERN-SPS in Pb-Pb interactions. Suppression by intermediate stage gluons represents an additional multiplicative factor to that given by Gerschel-Hufner mechanism. The agreement with data on J/Psi suppression both in light- ions induced nuclear collisions and in Pb-Pb interactions requires that the life-time of intermediate gluons increases with nucleon numbers of colliding nuclei. In our model the energy density of intermediate stage gluons in Pb-Pb collisions approaches for a short time the critical density.
|
hep-ph/9906400
|
Shaouly Bar-Shalom
|
David Atwood, Shaouly Bar-Shalom, Amarjit Soni
|
Gauge Boson - Gauge Boson Scattering in Theories with Large Extra
Dimensions
|
27 pages, plain latex, 7 figures embadded in the text using epsfig
|
Phys.Rev. D61 (2000) 054003
|
10.1103/PhysRevD.61.054003
|
UCRHEP-T258,BNL-HET-99/13
|
hep-ph
| null |
We consider the scattering amplitudes of the form V_1 V_2 -> V_3 V_4, where
V_i=\gamma, Z, W or g(=gluon) are the Standard Model gauge bosons, due to
graviton exchange in Kaluza-Klein theories with large extra dimensions. This
leads to a number of experimentally viable signatures at high energy leptonic
and hadronic colliders. We discuss the observability or future limits on the
scale of the gravitational interactions (m_D), that may be obtained at an e+e-
Next Linear Collider (NLC) and at the LHC, by studying some of these type of
gauge boson scattering processes. We find that the attainable limits through
these type of processes are: m_D > 3 TeV at the NLC and m_D > 6 TeV at the LHC.
|
[
{
"created": "Wed, 16 Jun 1999 22:08:50 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2000 11:51:37 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Atwood",
"David",
""
],
[
"Bar-Shalom",
"Shaouly",
""
],
[
"Soni",
"Amarjit",
""
]
] |
We consider the scattering amplitudes of the form V_1 V_2 -> V_3 V_4, where V_i=\gamma, Z, W or g(=gluon) are the Standard Model gauge bosons, due to graviton exchange in Kaluza-Klein theories with large extra dimensions. This leads to a number of experimentally viable signatures at high energy leptonic and hadronic colliders. We discuss the observability or future limits on the scale of the gravitational interactions (m_D), that may be obtained at an e+e- Next Linear Collider (NLC) and at the LHC, by studying some of these type of gauge boson scattering processes. We find that the attainable limits through these type of processes are: m_D > 3 TeV at the NLC and m_D > 6 TeV at the LHC.
|
1802.06344
|
Eugene Levin
|
Carlos Contreras (UTFSM), Eugene Levin (Tel Aviv U,/UTFSM), Rodrigo
Meneses (U.de Valparaiso) and Irina Potashnikova (UTFSM)
|
CGC/saturation approach: an impact-parameter dependent model for
diffraction production in DIS
|
20pp. 14 figures in eps format
| null |
10.1140/epjc/s10052-018-5957-z
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the paper we discussed the evolution equations for diffractive production
in the framework of CGC/saturation approach, and found the analytical solutions
for several kinematic regions. The most impressive features of these solutions
are, that diffractive production does not exibit geometric scaling behaviour
i.e. being a function of one variable.
Based on these solutions, we suggest an impact parameter dependent saturation
model, which is suitable for describing diffraction production both deep in the
saturation region, and in the vicinity of the saturation scale. Using the model
we attempted to fit the combined data on diffraction production from H1 and
ZEUS collaborations. We found that we are able describe both
$x_\pom$ and $\beta$ dependence, as well as $Q$ behavior of the measured
cross sections. In spite of the sufficiently large $\chi^2/d.o.f.$ we believe
that our description provides an initial impetus to find a fit of the
experimental data, based on the solution of the CGC/saturation equation, rather
than on describing the diffraction system in simplistic manner, assuming that
only quark-antiquark pair and one extra gluons, are produced.
|
[
{
"created": "Sun, 18 Feb 2018 07:38:47 GMT",
"version": "v1"
}
] |
2018-07-04
|
[
[
"Contreras",
"Carlos",
"",
"UTFSM"
],
[
"Levin",
"Eugene",
"",
"Tel Aviv U,/UTFSM"
],
[
"Meneses",
"Rodrigo",
"",
"U.de Valparaiso"
],
[
"Potashnikova",
"Irina",
"",
"UTFSM"
]
] |
In the paper we discussed the evolution equations for diffractive production in the framework of CGC/saturation approach, and found the analytical solutions for several kinematic regions. The most impressive features of these solutions are, that diffractive production does not exibit geometric scaling behaviour i.e. being a function of one variable. Based on these solutions, we suggest an impact parameter dependent saturation model, which is suitable for describing diffraction production both deep in the saturation region, and in the vicinity of the saturation scale. Using the model we attempted to fit the combined data on diffraction production from H1 and ZEUS collaborations. We found that we are able describe both $x_\pom$ and $\beta$ dependence, as well as $Q$ behavior of the measured cross sections. In spite of the sufficiently large $\chi^2/d.o.f.$ we believe that our description provides an initial impetus to find a fit of the experimental data, based on the solution of the CGC/saturation equation, rather than on describing the diffraction system in simplistic manner, assuming that only quark-antiquark pair and one extra gluons, are produced.
|
2407.21789
|
Elmar P. Biernat
|
Alfred Stadler, Elmar P. Biernat, Vasco Valverde
|
A simple high-accuracy method for solving bound-state equations with the
Cornell potential in momentum space
| null | null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a simple, high-accuracy method for solving bound-state integral
equations in momentum space with singular kernels. For the case of the
linear-confining potential, the associated Cauchy-principal-value singularity
is removed by subtraction. Derivatives of the wave function that appear as a
result of the subtraction technique are approximated by means of interpolating
functions. The resulting non-singular integral equation is solved using the
Nystr\"om method. The results show excellent agreement with exactly known
energy eigenvalues. By further increasing the number of integration points and
the order of the Lagrange interpolation, results with extremely high accuracy
can be achieved.
|
[
{
"created": "Wed, 31 Jul 2024 17:57:43 GMT",
"version": "v1"
}
] |
2024-08-01
|
[
[
"Stadler",
"Alfred",
""
],
[
"Biernat",
"Elmar P.",
""
],
[
"Valverde",
"Vasco",
""
]
] |
We present a simple, high-accuracy method for solving bound-state integral equations in momentum space with singular kernels. For the case of the linear-confining potential, the associated Cauchy-principal-value singularity is removed by subtraction. Derivatives of the wave function that appear as a result of the subtraction technique are approximated by means of interpolating functions. The resulting non-singular integral equation is solved using the Nystr\"om method. The results show excellent agreement with exactly known energy eigenvalues. By further increasing the number of integration points and the order of the Lagrange interpolation, results with extremely high accuracy can be achieved.
|
hep-ph/0408053
|
Andrea Banfi
|
Andrea Banfi
|
Dijet rates with symmetric cuts
|
4 pages, 1 figure; talk presented at DIS 2004, Strbske Pleso,
Slovakia, April 2004
| null | null |
NIKHEF-2004-009
|
hep-ph
| null |
We show that a resummation of infrared logarithms is needed to obtain a
sensible theoretical description of dijet rates when symmetric cuts are applied
to the transverse energies of both jets. We also present the next-to-leading
logarithmic (NLL) resummation we carried out for DIS production of two jets
selected with the cone algorithm.
|
[
{
"created": "Wed, 4 Aug 2004 12:45:04 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Banfi",
"Andrea",
""
]
] |
We show that a resummation of infrared logarithms is needed to obtain a sensible theoretical description of dijet rates when symmetric cuts are applied to the transverse energies of both jets. We also present the next-to-leading logarithmic (NLL) resummation we carried out for DIS production of two jets selected with the cone algorithm.
|
1805.12533
|
Jos\'e Francisco Zurita
|
David Curtin, Kaustubh Deshpande, Oliver Fischer and Jose Zurita
|
Probing BSM physics with electron-proton colliders
|
5 pages, 3 figures, talk at the 26th International Workshop on
Deep-Inelastic Scattering and Related Topics (DIS 2018)
| null | null |
TTP18-025
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk I will illustrate with two examples (Higgsino dark matter and
Exotic Higgs decays) how electron-proton colliders present unique opportunities
to probe BSM scenarios where proton-proton colliders fall short due to the
experimental difficulties in reconstructing the signal due to the large
hadronic backgrounds. The leit-motiv of these examples are long-lived particles
(LLPs), which have received recently a lot of attention from both the
experimental and theoretical communities. We find that the proposed $e^-p$
colliders can be competitive against their more energetic $pp$ incarnations for
lifetimes between a millimeter and a micron, depending on the physics scenario
under consideration.
|
[
{
"created": "Thu, 31 May 2018 16:07:44 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2018 14:13:44 GMT",
"version": "v2"
}
] |
2018-07-05
|
[
[
"Curtin",
"David",
""
],
[
"Deshpande",
"Kaustubh",
""
],
[
"Fischer",
"Oliver",
""
],
[
"Zurita",
"Jose",
""
]
] |
In this talk I will illustrate with two examples (Higgsino dark matter and Exotic Higgs decays) how electron-proton colliders present unique opportunities to probe BSM scenarios where proton-proton colliders fall short due to the experimental difficulties in reconstructing the signal due to the large hadronic backgrounds. The leit-motiv of these examples are long-lived particles (LLPs), which have received recently a lot of attention from both the experimental and theoretical communities. We find that the proposed $e^-p$ colliders can be competitive against their more energetic $pp$ incarnations for lifetimes between a millimeter and a micron, depending on the physics scenario under consideration.
|
1111.0516
|
Vladimir Zoller
|
R. Fiore and V. R. Zoller
|
UHE Neutrinos: Fusing gluons within diffraction cone
|
6 pages, 2 figures, Talk at the "Low-x" meeting, 2-7 June 2011
Santiago de Compostela
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Currently available estimates of the gluon-fusion effect in ultra-high energy
neutrino-nucleon interactions as well as in DIS on protons suffer from
uncertainty in defining the scattering profile function $\Gamma(b)$. Indeed,
the area, $S$, in the impact parameter space populated with interacting gluons
varies by a factor of $4 - 5$ from one analysis to another. To get rid of
uncertainties we specify the dipole-nucleon partial-wave amplitude $\Gamma(b)$
which meets the restrictions imposed by both the total dipole-nucleon cross
section and the small angle elastic scattering amplitude. The area $S$ becomes
a well defined quantity proportional to the diffraction cone slope. We solve
numerically the non-linear color dipole BFKL equation and evaluate the UHE
neutrino-nucleon total cross section. Our finding is that the saturation is a
rather weak effect, $\lsim 25%$, up to $E_{\nu}\sim 10^{12}$ GeV.
|
[
{
"created": "Wed, 2 Nov 2011 14:38:38 GMT",
"version": "v1"
}
] |
2011-11-03
|
[
[
"Fiore",
"R.",
""
],
[
"Zoller",
"V. R.",
""
]
] |
Currently available estimates of the gluon-fusion effect in ultra-high energy neutrino-nucleon interactions as well as in DIS on protons suffer from uncertainty in defining the scattering profile function $\Gamma(b)$. Indeed, the area, $S$, in the impact parameter space populated with interacting gluons varies by a factor of $4 - 5$ from one analysis to another. To get rid of uncertainties we specify the dipole-nucleon partial-wave amplitude $\Gamma(b)$ which meets the restrictions imposed by both the total dipole-nucleon cross section and the small angle elastic scattering amplitude. The area $S$ becomes a well defined quantity proportional to the diffraction cone slope. We solve numerically the non-linear color dipole BFKL equation and evaluate the UHE neutrino-nucleon total cross section. Our finding is that the saturation is a rather weak effect, $\lsim 25%$, up to $E_{\nu}\sim 10^{12}$ GeV.
|
1211.7165
|
Helen Matskevich
|
S. M. Gerasyuta and E. E. Matskevich
|
Low-lying hypernuclei in the relativistic quark-gluon model
|
8 pages. arXiv admin note: substantial text overlap with
arXiv:1211.0667; and text overlap with arXiv:1206.5219 by other authors
| null |
10.1103/PhysRevD.87.116006
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Low-lying hypernuclei $ ^3_{\Lambda}H$, $ ^3_{\Sigma}H$, $ ^3_{\Lambda}He$, $
^3_{\Sigma}He$ are described by the relativistic nine-quark equations in the
framework of the dispersion relation technique. The approximate solutions of
these equations using the method based on the extraction of leading
singularities of the amplitudes are obtained. The relativistic nine-quark
amplitudes of hypernuclei, including the quarks of three flavors ($u$, $d$,
$s$) are calculated. The poles of these amplitudes determine the masses of
hypernuclei. The mass of state $ ^3_{\Lambda}H$ with the isospin I=0 and the
spin-parity $J^P=\frac{1}{2}^+$ is equal to $M=2991\, MeV$.
|
[
{
"created": "Fri, 30 Nov 2012 07:10:20 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2013 06:45:53 GMT",
"version": "v2"
}
] |
2015-06-12
|
[
[
"Gerasyuta",
"S. M.",
""
],
[
"Matskevich",
"E. E.",
""
]
] |
Low-lying hypernuclei $ ^3_{\Lambda}H$, $ ^3_{\Sigma}H$, $ ^3_{\Lambda}He$, $ ^3_{\Sigma}He$ are described by the relativistic nine-quark equations in the framework of the dispersion relation technique. The approximate solutions of these equations using the method based on the extraction of leading singularities of the amplitudes are obtained. The relativistic nine-quark amplitudes of hypernuclei, including the quarks of three flavors ($u$, $d$, $s$) are calculated. The poles of these amplitudes determine the masses of hypernuclei. The mass of state $ ^3_{\Lambda}H$ with the isospin I=0 and the spin-parity $J^P=\frac{1}{2}^+$ is equal to $M=2991\, MeV$.
|
hep-ph/0102099
|
Alexander Studenikin
|
M. Dvornikov, A.Studenikin
|
Parametric Resonance of Neutrino Oscillations in Electromagnetic Wave
|
The enlarged version of contribution to the Proceedings of the Third
International Workshop on New Worlds in Astroparticle Physics (Faro, 2000)
| null |
10.1142/9789812811035_0012
| null |
hep-ph
| null |
Within the Lorentz invariant formalizm for description of neutrino evolution
in electromagnetic fields and matter we consider neutrino spin oscillations in
the circular polarized electromagnetic wave, the amplitude of which is a
modulated function of time. It is shown for the first time that the parametric
resonance of neutrino oscillations can occur in such a system.
|
[
{
"created": "Thu, 8 Feb 2001 15:45:50 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Feb 2001 15:21:55 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Apr 2001 13:41:43 GMT",
"version": "v3"
}
] |
2016-11-03
|
[
[
"Dvornikov",
"M.",
""
],
[
"Studenikin",
"A.",
""
]
] |
Within the Lorentz invariant formalizm for description of neutrino evolution in electromagnetic fields and matter we consider neutrino spin oscillations in the circular polarized electromagnetic wave, the amplitude of which is a modulated function of time. It is shown for the first time that the parametric resonance of neutrino oscillations can occur in such a system.
|
hep-ph/9412390
|
W. S. Hou
|
Wei-Shu Hou and Gwo-Guang Wong
|
Perspective on Quark Mass and Mixing Relations
|
10 pages, ReVtex, no figures
|
Phys.Rev.D52:5269-5272,1995
|
10.1103/PhysRevD.52.5269
|
NTUTH-94-21
|
hep-ph
| null |
Recent data indicate that $V_{ub}\cong \lambda^4 \cong (0.22)^4$, while $m_t$
seems to be $174$ GeV. The relations $m_d/m_s\sim m_s/m_b \sim \delta \sim
\lambda^2 \simeq \vert V_{cb}\vert$ and $m_u/m_c\sim m_c/m_t \sim \delta^2 \sim
\lambda^4 \sim \vert V_{ub}\vert$ suggest that %a plausible clean separation of
the %origin of the quark mixing matrix: the down type sector is responsible for
$\vert V_{us}\vert$ and $\vert V_{cb}\vert$, while $V_{ub}$ comes from the up
type sector. Five to six parameters might suffice to account for the ten quark
mass and mixing parameters, resulting in specific power series representations
for the mass matrices. In this picture, $\delta$ seems to be the more sensible
expansion parameter, while $\lambda \cong \sqrt{m_d/m_s} \sim \sqrt{\delta}$ is
tied empirically to $(M_d)_{11} = 0$.
|
[
{
"created": "Sat, 31 Dec 1994 01:09:16 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Hou",
"Wei-Shu",
""
],
[
"Wong",
"Gwo-Guang",
""
]
] |
Recent data indicate that $V_{ub}\cong \lambda^4 \cong (0.22)^4$, while $m_t$ seems to be $174$ GeV. The relations $m_d/m_s\sim m_s/m_b \sim \delta \sim \lambda^2 \simeq \vert V_{cb}\vert$ and $m_u/m_c\sim m_c/m_t \sim \delta^2 \sim \lambda^4 \sim \vert V_{ub}\vert$ suggest that %a plausible clean separation of the %origin of the quark mixing matrix: the down type sector is responsible for $\vert V_{us}\vert$ and $\vert V_{cb}\vert$, while $V_{ub}$ comes from the up type sector. Five to six parameters might suffice to account for the ten quark mass and mixing parameters, resulting in specific power series representations for the mass matrices. In this picture, $\delta$ seems to be the more sensible expansion parameter, while $\lambda \cong \sqrt{m_d/m_s} \sim \sqrt{\delta}$ is tied empirically to $(M_d)_{11} = 0$.
|
0708.2905
|
Roman Nevzorov
|
C.D. Froggatt, R. Nevzorov, H.B. Nielsen
|
Enhanced Higgs boson production and avoidance of CP-violation and FCNC
in the MPP inspired 2HDM
|
Talk given at the 2007 Europhysics Conference on High Energy Physics,
Manchester, England, 19-25 July 2007, CERN preprint number added, references
updated
|
J.Phys.Conf.Ser.110:062010,2008
|
10.1088/1742-6596/110/6/062010
|
CERN-PH-TH/2007-193
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The multiple point principle (MPP) can be used to suppress non--diagonal
flavour transitions and CP violation in the two Higgs doublet extension of the
standard model. We discuss the quasi--fixed point scenario in the MPP inspired
two Higgs doublet model which leads to the enhanced production of Higgs
particles at the LHC if the MPP scale is low.
|
[
{
"created": "Tue, 21 Aug 2007 19:42:45 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Aug 2007 20:02:36 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Jun 2008 18:58:31 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Froggatt",
"C. D.",
""
],
[
"Nevzorov",
"R.",
""
],
[
"Nielsen",
"H. B.",
""
]
] |
The multiple point principle (MPP) can be used to suppress non--diagonal flavour transitions and CP violation in the two Higgs doublet extension of the standard model. We discuss the quasi--fixed point scenario in the MPP inspired two Higgs doublet model which leads to the enhanced production of Higgs particles at the LHC if the MPP scale is low.
|
hep-ph/0612191
|
Robert D. Pisarski
|
Robert D. Pisarski
|
Fuzzy Bags and Wilson Lines
|
9 pages, 2 figures, PTPTeX. Based upon a talk given at Yukawa
International Seminar (YKIS) 2006, ``New Frontiers in QCD -- Exotic Hadrons
and Hadronic Matter''
|
Prog.Theor.Phys.Suppl.168:276-284,2007
|
10.1143/PTPS.168.276
| null |
hep-ph
| null |
I start with an elementary observation about the pressure in the deconfined
phase of a SU(3) gauge theory without quarks. This suggests a ``fuzzy'' bag
model for the analogous pressure in QCD, with dynamical quarks. I then sketch
how the deconfined phase might be described using an effective theory of Wilson
lines. To leading order in weak coupling, the effective electric field appears
in a form familiar from the lattice theory of Banks and Ukawa.
|
[
{
"created": "Fri, 15 Dec 2006 12:33:01 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Pisarski",
"Robert D.",
""
]
] |
I start with an elementary observation about the pressure in the deconfined phase of a SU(3) gauge theory without quarks. This suggests a ``fuzzy'' bag model for the analogous pressure in QCD, with dynamical quarks. I then sketch how the deconfined phase might be described using an effective theory of Wilson lines. To leading order in weak coupling, the effective electric field appears in a form familiar from the lattice theory of Banks and Ukawa.
|
1211.3052
|
C\'edric Weiland
|
A. Abada, D. Das, A.M. Teixeira, A. Vicente and C. Weiland
|
Tree-level lepton universality violation in the presence of sterile
neutrinos: impact for $R_K$ and $R_\pi$
|
9 pages, 2 eps figures
| null |
10.1007/JHEP02(2013)048
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a tree-level enhancement to the violation of lepton flavour
universality in light meson decays arising from modified $W \ell \nu$ couplings
in the standard model minimally extended by sterile neutrinos. Due to the
presence of additional mixings between the active (left-handed) neutrinos and
the new sterile states, the deviation from unitarity of the leptonic mixing
matrix intervening in charged currents might lead to a tree-level enhancement
of $R_{P} = \Gamma (P \to e \nu) / \Gamma (P \to \mu \nu)$, with $P=K, \pi$. We
illustrate these enhancements in the case of the inverse seesaw model, showing
that one can saturate the current experimental bounds on $\Delta r_{K}$ (and
$\Delta r_{\pi}$), while in agreement with the different experimental and
observational constraints.
|
[
{
"created": "Tue, 13 Nov 2012 17:09:48 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Nov 2012 18:20:07 GMT",
"version": "v2"
}
] |
2015-06-12
|
[
[
"Abada",
"A.",
""
],
[
"Das",
"D.",
""
],
[
"Teixeira",
"A. M.",
""
],
[
"Vicente",
"A.",
""
],
[
"Weiland",
"C.",
""
]
] |
We consider a tree-level enhancement to the violation of lepton flavour universality in light meson decays arising from modified $W \ell \nu$ couplings in the standard model minimally extended by sterile neutrinos. Due to the presence of additional mixings between the active (left-handed) neutrinos and the new sterile states, the deviation from unitarity of the leptonic mixing matrix intervening in charged currents might lead to a tree-level enhancement of $R_{P} = \Gamma (P \to e \nu) / \Gamma (P \to \mu \nu)$, with $P=K, \pi$. We illustrate these enhancements in the case of the inverse seesaw model, showing that one can saturate the current experimental bounds on $\Delta r_{K}$ (and $\Delta r_{\pi}$), while in agreement with the different experimental and observational constraints.
|
1606.00476
|
Erez Raicher
|
Erez Raicher, Shalom Eliezer, and Arie Zigler
|
Non-Linear Compton Scattering in a Strong Rotating Electric Field
|
17 pages, 9 figures
|
Phys. Rev. A 94, 062105 (2016)
|
10.1103/PhysRevA.94.062105
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The non-linear Compton scattering rate in a rotating electric field is
explicitly calculated for the first time. For this purpose, a novel solution to
the Klein-Gordon equation in the presence of a rotating electric field is
applied. An analytical expression for the emission rate is obtained, as well as
a simplified approximation adequate for emplementation in kinetic codes. The
spectrum is numerically calculated for nowadays optical and X-ray laser
parameters. The results are compared to the standard Volkov-Ritus rate for a
particle in a plane wave, which is commonly assumed to be valid for a rotating
electric field under certain conditions. Subsequent deviations between the two
models, both in the radiated power and the spectral shape, are demonstrated.
First, the typical number of photons participating in the scattering process is
much smaller compared to the Volkov-Ritus rate, resulting in up to an order of
magnitude lower emitted power. Furthermore, our model predicts a discrete
harmonics spectrum for electrons with low asymptotic momentum compared to the
field amplitude. This discrete structure is a clear imprint of the electric
field frequency, as opposed to the Volkov-Ritus rate which reduces to the
constant crossed field rate for the physical conditions under consideration.
Our model predictions can be tested with present-days laser facilities.
|
[
{
"created": "Wed, 1 Jun 2016 21:29:49 GMT",
"version": "v1"
}
] |
2016-12-14
|
[
[
"Raicher",
"Erez",
""
],
[
"Eliezer",
"Shalom",
""
],
[
"Zigler",
"Arie",
""
]
] |
The non-linear Compton scattering rate in a rotating electric field is explicitly calculated for the first time. For this purpose, a novel solution to the Klein-Gordon equation in the presence of a rotating electric field is applied. An analytical expression for the emission rate is obtained, as well as a simplified approximation adequate for emplementation in kinetic codes. The spectrum is numerically calculated for nowadays optical and X-ray laser parameters. The results are compared to the standard Volkov-Ritus rate for a particle in a plane wave, which is commonly assumed to be valid for a rotating electric field under certain conditions. Subsequent deviations between the two models, both in the radiated power and the spectral shape, are demonstrated. First, the typical number of photons participating in the scattering process is much smaller compared to the Volkov-Ritus rate, resulting in up to an order of magnitude lower emitted power. Furthermore, our model predicts a discrete harmonics spectrum for electrons with low asymptotic momentum compared to the field amplitude. This discrete structure is a clear imprint of the electric field frequency, as opposed to the Volkov-Ritus rate which reduces to the constant crossed field rate for the physical conditions under consideration. Our model predictions can be tested with present-days laser facilities.
|
hep-ph/9302221
|
Bruce Campbell
|
B.A. Campbell, S. Davidson, J. Ellis, And K.A. Olive
|
On the Baryon, Lepton-Flavour and Right-Handed Electron Asymmetries of
the Universe
|
LATEX File with 12 pages, one figure (not included); published in
Phys. Lett B297 (1992) p118
|
Phys.Lett.B297:118-124,1992
|
10.1016/0370-2693(92)91079-O
| null |
hep-ph
| null |
Non-perturbative electroweak effects, in thermal equilibrium in the early
universe, have the potential to erase the baryon asymmetry of the universe,
unless it is encoded in a B-L asymmetry, or in some "accidentally" conserved
quantity. We first consider the possibility that the BAU may be regenerated
from lepton flavour asymmetries even when initially $B-L = 0$. We show that
provided some, but {\it not} all the lepton flavours are violated by
${\Delta}L{\neq}0$ interactions in equilibrium, the BAU may be regenerated
without lepton mass effects. We next examine the possibility of encoding the
baryon asymmetry in a primordial asymmetry for the right-handed electron, which
due to its weak Yukawa interaction only comes into chemical equilibrium as the
sphalerons are falling out of equilibrium. This would also raise the
possibility of preserving an initial baryon asymmetry when $B-L = 0$.
|
[
{
"created": "Fri, 5 Feb 1993 02:11:58 GMT",
"version": "v1"
}
] |
2009-09-11
|
[
[
"Campbell",
"B. A.",
""
],
[
"Davidson",
"S.",
""
],
[
"Ellis",
"J.",
""
],
[
"Olive",
"And K. A.",
""
]
] |
Non-perturbative electroweak effects, in thermal equilibrium in the early universe, have the potential to erase the baryon asymmetry of the universe, unless it is encoded in a B-L asymmetry, or in some "accidentally" conserved quantity. We first consider the possibility that the BAU may be regenerated from lepton flavour asymmetries even when initially $B-L = 0$. We show that provided some, but {\it not} all the lepton flavours are violated by ${\Delta}L{\neq}0$ interactions in equilibrium, the BAU may be regenerated without lepton mass effects. We next examine the possibility of encoding the baryon asymmetry in a primordial asymmetry for the right-handed electron, which due to its weak Yukawa interaction only comes into chemical equilibrium as the sphalerons are falling out of equilibrium. This would also raise the possibility of preserving an initial baryon asymmetry when $B-L = 0$.
|
hep-ph/0305018
|
Masafumi Kurachi
|
Masayasu Harada, Masafumi Kurachi and Koichi Yamawaki
|
Meson masses in large Nf QCD from the Bethe-Salpeter equation
|
33 pages, 16 figures. Typos are corrected. Minor corrections and
references are added. Version to appear in Phys. Rev. D
|
Phys.Rev. D68 (2003) 076001
|
10.1103/PhysRevD.68.076001
|
DPNU-03-09
|
hep-ph
| null |
We solve the homogeneous Bethe-Salpeter (HBS) equation for the scalar,
pseudoscalar, vector, and axial-vector bound states of quark and anti-quark in
large Nf QCD with the improved ladder approximation in the Landau gauge. The
quark mass function in the HBS equation is obtained from the Schwinger-Dyson
(SD) equation in the same approximation for consistency with the chiral
symmetry. Amazingly, due to the fact that the two-loop running coupling of
large Nf QCD is explicitly written in terms of an analytic function, large Nf
QCD turns out to be the first example in which the SD equation can be solved in
the complex plane and hence the HBS equation directly in the time-like region.
We find that approaching the chiral phase transition point from the broken
phase, the scalar, vector, and axial-vector meson masses vanish to zero with
the same scaling behavior, all degenerate with the massless pseudoscalar meson.
This may suggest a new type of manifestation of the chiral symmetry restoration
in large Nf QCD.
|
[
{
"created": "Fri, 2 May 2003 11:00:28 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Sep 2003 10:45:57 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Harada",
"Masayasu",
""
],
[
"Kurachi",
"Masafumi",
""
],
[
"Yamawaki",
"Koichi",
""
]
] |
We solve the homogeneous Bethe-Salpeter (HBS) equation for the scalar, pseudoscalar, vector, and axial-vector bound states of quark and anti-quark in large Nf QCD with the improved ladder approximation in the Landau gauge. The quark mass function in the HBS equation is obtained from the Schwinger-Dyson (SD) equation in the same approximation for consistency with the chiral symmetry. Amazingly, due to the fact that the two-loop running coupling of large Nf QCD is explicitly written in terms of an analytic function, large Nf QCD turns out to be the first example in which the SD equation can be solved in the complex plane and hence the HBS equation directly in the time-like region. We find that approaching the chiral phase transition point from the broken phase, the scalar, vector, and axial-vector meson masses vanish to zero with the same scaling behavior, all degenerate with the massless pseudoscalar meson. This may suggest a new type of manifestation of the chiral symmetry restoration in large Nf QCD.
|
1904.06732
|
Alexander Berezhnoy
|
A. V. Berezhnoy, I. N. Belov, A. K. Likhoded, and A. V. Luchinsky
|
$B_c$ excitations at LHC experiments
|
18 pages, 4 figures, typos fixed, two figures with Bc(P) decays
changed
|
Mod. Phys. Lett. A. 34 (2019) 1950331
|
10.1142/S0217732319503310
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $2S$ $B_c$ states observed by ATLAS, CMS and LHCb Collaborations are
discussed. The observation perspectives of $B_c^*$, $2P$ wave, $3P$ wave and
$D$ wave states of $B_c$ at LHC experiments are estimated.
|
[
{
"created": "Sun, 14 Apr 2019 17:54:29 GMT",
"version": "v1"
},
{
"created": "Wed, 15 May 2019 20:32:14 GMT",
"version": "v2"
}
] |
2019-09-17
|
[
[
"Berezhnoy",
"A. V.",
""
],
[
"Belov",
"I. N.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Luchinsky",
"A. V.",
""
]
] |
The $2S$ $B_c$ states observed by ATLAS, CMS and LHCb Collaborations are discussed. The observation perspectives of $B_c^*$, $2P$ wave, $3P$ wave and $D$ wave states of $B_c$ at LHC experiments are estimated.
|
hep-ph/9411346
|
Anna Jadczyk
|
Ludwik Turko
|
Hadronic Matter with Internal Symmetries and its Consequences: An
Expanding Hadronic Gas
|
7 pages, 2 figures - uucoded file of figures appended at the end,
separated from the paper by lines with many dashes
| null | null | null |
hep-ph
| null |
We consider an ideal gas of massive hadrons in thermal and chemical
equilibrium. The gas expands longitudinally in accordance with Bjorken law.
Strangeness and baryon number conservation is taken into account. This gas has
different features as compared to the pion gas.
|
[
{
"created": "Mon, 21 Nov 1994 10:44:56 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Turko",
"Ludwik",
""
]
] |
We consider an ideal gas of massive hadrons in thermal and chemical equilibrium. The gas expands longitudinally in accordance with Bjorken law. Strangeness and baryon number conservation is taken into account. This gas has different features as compared to the pion gas.
|
2309.16236
|
Sam Van Thurenhout
|
S. Van Thurenhout
|
Basis transformation properties of anomalous dimensions for hard
exclusive processes
|
39 pages, LaTeX, 2 figures, journal version
|
Nucl.Phys.B 1000 (2024) 116464
|
10.1016/j.nuclphysb.2024.116464
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When considering the renormalization of composite operators for the
description of hard exclusive scattering processes, two types of operator basis
called the derivative basis and the Gegenbauer basis are often used in the
literature. In this work we set up the explicit similarity transformations
between these two bases, both for quark and gluon operators. This way, one can
use the properties of both bases to their advantage in the computation of the
operator anomalous dimensions, which describe the scale dependence of
non-perturbative non-forward parton distributions. We provide several
applications of our framework. As an application of the gluon transformation
formula, we compute the one-loop non-forward purely gluonic anomalous dimension
matrix. For the rest of the applications we focus on the transformation formula
of the quark operator. We derive the Gegenbauer anomalous dimensions, in the
limit of a large number of quark flavors $n_f$, to all orders in the strong
coupling $\alpha_s$, extending the computation previously performed in the
derivative basis. Next a numeric calculation of the two-loop anomalous
dimensions in the derivative basis beyond the leading-color limit is presented.
Finally, we discuss a novel way of validating existing computations of the
conformal anomaly based on the leading-color anomalous dimensions in the
derivative basis.
|
[
{
"created": "Thu, 28 Sep 2023 08:20:55 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2024 06:49:55 GMT",
"version": "v2"
}
] |
2024-02-15
|
[
[
"Van Thurenhout",
"S.",
""
]
] |
When considering the renormalization of composite operators for the description of hard exclusive scattering processes, two types of operator basis called the derivative basis and the Gegenbauer basis are often used in the literature. In this work we set up the explicit similarity transformations between these two bases, both for quark and gluon operators. This way, one can use the properties of both bases to their advantage in the computation of the operator anomalous dimensions, which describe the scale dependence of non-perturbative non-forward parton distributions. We provide several applications of our framework. As an application of the gluon transformation formula, we compute the one-loop non-forward purely gluonic anomalous dimension matrix. For the rest of the applications we focus on the transformation formula of the quark operator. We derive the Gegenbauer anomalous dimensions, in the limit of a large number of quark flavors $n_f$, to all orders in the strong coupling $\alpha_s$, extending the computation previously performed in the derivative basis. Next a numeric calculation of the two-loop anomalous dimensions in the derivative basis beyond the leading-color limit is presented. Finally, we discuss a novel way of validating existing computations of the conformal anomaly based on the leading-color anomalous dimensions in the derivative basis.
|
hep-ph/0701193
|
Rohini Godbole Professor
|
Rohini M. Godbole
|
Moderately light charged Higgs in \cp MSSM and NMSSM
|
LaTeX, six pages, four figures. Talk presented at the IPM School and
Conference on Lepton Hadron Physics, Tehran, May 2006
|
ECONFC0605151:0016,2006
| null |
IISc-CHEP/2/07
|
hep-ph
| null |
In this talk I discuss some aspects of the phenomenology of a moderately
light charged Higgs ($H^\pm$) with a mass $\gts 130$ GeV, lighter than the top
quark, at the LHC. A charged Higgs in this mass range is still allowed in
next-to-minimal Supersymmetric Standard Model (NMSSM) at low $\tan \beta$ as
well as in CP-violating (\cp) Minimal Supersymmetric Standard Model (MSSM) for
a certain choice of \cp parameters, still respecting all the LEP-II bounds. In
both the cases, the $H^\pm$ has a large branching ratio in the $W^\pm \phi$
channel, where $\phi$ denotes a generic Higgs which is dominantly pseudoscalar
and hence may be substantially lighter than the LEP-II mass bound. This $\phi$
decays dominantly into a $b \bar b$ pair. Thus production of $H^\pm$ in the top
decay gives a striking $t \bar t$ signal at the LHC, where one of the top
quarks decays into the $bb \bar b W$ channel, via $t \to b H^\pm, H^\pm \to
\phi$ and $\phi \to b \bar b$. The characteristic correlation between the $b
\bar b$, $b \bar b W$ and $b b \bar b W$ invariant mass peaks helps reduce the
Standard Model (SM) background very effectively. For these low values of $\tan
\beta$ the $H^\pm \to \tau \nu_\tau $ channel does not provide any reach for
the $H^\pm$. Thus this is a signal for both a light charged $H^\pm$ and a light
$\phi$, which is mostly pseudoscalar in nature and decays dominantly into a $b
\bar b$ pair.
|
[
{
"created": "Tue, 23 Jan 2007 15:58:06 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Godbole",
"Rohini M.",
""
]
] |
In this talk I discuss some aspects of the phenomenology of a moderately light charged Higgs ($H^\pm$) with a mass $\gts 130$ GeV, lighter than the top quark, at the LHC. A charged Higgs in this mass range is still allowed in next-to-minimal Supersymmetric Standard Model (NMSSM) at low $\tan \beta$ as well as in CP-violating (\cp) Minimal Supersymmetric Standard Model (MSSM) for a certain choice of \cp parameters, still respecting all the LEP-II bounds. In both the cases, the $H^\pm$ has a large branching ratio in the $W^\pm \phi$ channel, where $\phi$ denotes a generic Higgs which is dominantly pseudoscalar and hence may be substantially lighter than the LEP-II mass bound. This $\phi$ decays dominantly into a $b \bar b$ pair. Thus production of $H^\pm$ in the top decay gives a striking $t \bar t$ signal at the LHC, where one of the top quarks decays into the $bb \bar b W$ channel, via $t \to b H^\pm, H^\pm \to \phi$ and $\phi \to b \bar b$. The characteristic correlation between the $b \bar b$, $b \bar b W$ and $b b \bar b W$ invariant mass peaks helps reduce the Standard Model (SM) background very effectively. For these low values of $\tan \beta$ the $H^\pm \to \tau \nu_\tau $ channel does not provide any reach for the $H^\pm$. Thus this is a signal for both a light charged $H^\pm$ and a light $\phi$, which is mostly pseudoscalar in nature and decays dominantly into a $b \bar b$ pair.
|
0708.2588
|
Hong-Jian He
|
Hong-Jian He, Yu-Ping Kuang, Yong-Hui Qi, Bin Zhang (Tsinghua),
Alexander Belyaev, R. Sekhar Chivukula, Neil D. Christensen, Alexander
Pukhov, Elizabeth H. Simmons (MSU)
|
LHC Signatures of New Gauge Bosons in the Minimal Higgsless Model
|
5pp, Rapid Communication of PRD (in Press). Minor clarifications to
stress the importance and broad interest of this work. (All results
un-changed.)
|
Phys.Rev.D78:031701,2008
|
10.1103/PhysRevD.78.031701
|
TUHEP-TH-07162, MSUHEP-070817
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the LHC signatures of new gauge bosons in the gauge-invariant
minimal Higgsless model. It predicts an extra pair of W_1 and Z_1 bosons which
can be as light as ~400GeV and play a key role in the delay of unitarity
violation. We analyze the W_1 signals in pp --> W_0Z_0Z_0 --> jj4\ell and pp
--> jj W_0Z_0 --> jj3\ell\nu processes at the LHC, including the complete
electroweak and QCD backgrounds. We reveal the complementarity between these
two channels for discovering the W_1 boson, and demonstrate the LHC discovery
potential over the full range of allowed W_1 mass.
|
[
{
"created": "Mon, 20 Aug 2007 06:28:06 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 2008 17:11:45 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"He",
"Hong-Jian",
"",
"Tsinghua"
],
[
"Kuang",
"Yu-Ping",
"",
"Tsinghua"
],
[
"Qi",
"Yong-Hui",
"",
"Tsinghua"
],
[
"Zhang",
"Bin",
"",
"Tsinghua"
],
[
"Belyaev",
"Alexander",
"",
"MSU"
],
[
"Chivukula",
"R. Sekhar",
"",
"MSU"
],
[
"Christensen",
"Neil D.",
"",
"MSU"
],
[
"Pukhov",
"Alexander",
"",
"MSU"
],
[
"Simmons",
"Elizabeth H.",
"",
"MSU"
]
] |
We study the LHC signatures of new gauge bosons in the gauge-invariant minimal Higgsless model. It predicts an extra pair of W_1 and Z_1 bosons which can be as light as ~400GeV and play a key role in the delay of unitarity violation. We analyze the W_1 signals in pp --> W_0Z_0Z_0 --> jj4\ell and pp --> jj W_0Z_0 --> jj3\ell\nu processes at the LHC, including the complete electroweak and QCD backgrounds. We reveal the complementarity between these two channels for discovering the W_1 boson, and demonstrate the LHC discovery potential over the full range of allowed W_1 mass.
|
hep-ph/0105078
|
Daoneng Gao
|
Giancarlo D'Ambrosio and Dao-Neng Gao
|
The diquark model: New Physics effects for charm and kaon decays
|
LaTeX, 12 pages and 2 eps figures. Minor changes, paper accepted by
Physics Letters B
|
Phys.Lett.B513:123-129,2001
|
10.1016/S0370-2693(01)00666-9
|
INFNNA-IV-2001/12, DSFNA-IV-2001/12
|
hep-ph
| null |
Motivated by diquark exchange, we construct a class of extensions of the
standard model. These models can generate large CP conserving and CP violating
contributions to the doubly Cabbibo suppressed decays D^0\to K^+\pi^- without
affecting D^0-\overline{D^0} mixing, contrary to what is usually believed in
the literature. We find an interesting specific realization of these models,
which has the LR chiral structure and can induce novel density \times density
operators. It is new for non-leptonic kaon decays, and particularly, may
provide a possible solution to the \Delta I=1/2 rule and direct CP violation,
without inducing large flavour changing neutral currents.
|
[
{
"created": "Wed, 9 May 2001 17:49:40 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2001 08:43:11 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"D'Ambrosio",
"Giancarlo",
""
],
[
"Gao",
"Dao-Neng",
""
]
] |
Motivated by diquark exchange, we construct a class of extensions of the standard model. These models can generate large CP conserving and CP violating contributions to the doubly Cabbibo suppressed decays D^0\to K^+\pi^- without affecting D^0-\overline{D^0} mixing, contrary to what is usually believed in the literature. We find an interesting specific realization of these models, which has the LR chiral structure and can induce novel density \times density operators. It is new for non-leptonic kaon decays, and particularly, may provide a possible solution to the \Delta I=1/2 rule and direct CP violation, without inducing large flavour changing neutral currents.
|
hep-ph/0310044
|
Enrique Ruiz Arriola
|
E. Ruiz Arriola (Departamento de Fisica Moderna, Universidad de
Granada, Granada, Spain), Wojciech Broniowski (The H. Niewodniczanski
Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland)
|
The Spectral Quark Model and Light Cone Phenomenology
|
Talk Presented at "Light Cone Workshop: Hadrons and Beyond", 5th-9th
August 2003, University of Durham (U.K.) 6 pages, 2 figures
| null | null | null |
hep-ph
| null |
Chiral quark models offer a practical and simple tool to describe covariantly
both low and high energy phenomenology in combination with QCD evolution. This
can be done in full harmony with chiral symmetry and electromagnetic gauge
invariance. We review the recently proposed spectral quark model where all
these constraints are implemented.
|
[
{
"created": "Fri, 3 Oct 2003 08:53:49 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Oct 2003 07:47:21 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Arriola",
"E. Ruiz",
"",
"Departamento de Fisica Moderna, Universidad de\n Granada, Granada, Spain"
],
[
"Broniowski",
"Wojciech",
"",
"The H. Niewodniczanski\n Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland"
]
] |
Chiral quark models offer a practical and simple tool to describe covariantly both low and high energy phenomenology in combination with QCD evolution. This can be done in full harmony with chiral symmetry and electromagnetic gauge invariance. We review the recently proposed spectral quark model where all these constraints are implemented.
|
1612.03914
|
Wouter Dekens
|
V. Cirigliano, W. Dekens, J. de Vries, and E. Mereghetti
|
An $\epsilon'$ improvement from right-handed currents
|
17 pages
| null |
10.1016/j.physletb.2017.01.037
|
LA-UR-16-28961, NIKHEF 2016-056
|
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent lattice QCD calculations of direct CP violation in $K_L \to \pi \pi$
decays indicate tension with the experimental results. Assuming this tension to
be real, we investigate a possible beyond-the-Standard Model explanation via
right-handed charged currents. By using chiral perturbation theory in
combination with lattice QCD results, we accurately calculate the modification
of $\epsilon'/\epsilon$ induced by right-handed charged currents and extract
values of the couplings that are necessary to explain the discrepancy, pointing
to a scale around $10^2$ TeV. We find that couplings of this size are not in
conflict with constraints from other precision experiments, but next-generation
hadronic electric dipole moment searches (such as neutron and ${}^{225}$Ra) can
falsify this scenario. We work out in detail a direct link, based on chiral
perturbation theory, between CP violation in the kaon sector and electric
dipole moments induced by right-handed currents which can be used in future
analyses of left-right symmetric models.
|
[
{
"created": "Mon, 12 Dec 2016 21:00:03 GMT",
"version": "v1"
}
] |
2017-01-25
|
[
[
"Cirigliano",
"V.",
""
],
[
"Dekens",
"W.",
""
],
[
"de Vries",
"J.",
""
],
[
"Mereghetti",
"E.",
""
]
] |
Recent lattice QCD calculations of direct CP violation in $K_L \to \pi \pi$ decays indicate tension with the experimental results. Assuming this tension to be real, we investigate a possible beyond-the-Standard Model explanation via right-handed charged currents. By using chiral perturbation theory in combination with lattice QCD results, we accurately calculate the modification of $\epsilon'/\epsilon$ induced by right-handed charged currents and extract values of the couplings that are necessary to explain the discrepancy, pointing to a scale around $10^2$ TeV. We find that couplings of this size are not in conflict with constraints from other precision experiments, but next-generation hadronic electric dipole moment searches (such as neutron and ${}^{225}$Ra) can falsify this scenario. We work out in detail a direct link, based on chiral perturbation theory, between CP violation in the kaon sector and electric dipole moments induced by right-handed currents which can be used in future analyses of left-right symmetric models.
|
hep-ph/0409362
|
Dmitri Diakonov
|
Dmitri Diakonov and Victor Petrov
|
Baryons as Fock states of 3,5,... quarks
|
20 p., 6 figs
|
Annalen Phys.13:637-650,2004
|
10.1002/andp.200410106
|
JLAB-THY-04-275
|
hep-ph
| null |
We present a generating functional producing quark wave functions of all Fock
states in the octet, decuplet and antidecuplet baryons in the mean field
approximation, both in the rest and infinite momentum frames. In particular,
for the usual octet and decuplet baryons we get the SU(6)-symmetric wave
functions for their 3-quark component but with specific corrections from
relativism and from additional quark-antiquark pairs. For the exotic
antidecuplet baryons we obtain the 5-quark wave function.
|
[
{
"created": "Thu, 30 Sep 2004 19:53:42 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Diakonov",
"Dmitri",
""
],
[
"Petrov",
"Victor",
""
]
] |
We present a generating functional producing quark wave functions of all Fock states in the octet, decuplet and antidecuplet baryons in the mean field approximation, both in the rest and infinite momentum frames. In particular, for the usual octet and decuplet baryons we get the SU(6)-symmetric wave functions for their 3-quark component but with specific corrections from relativism and from additional quark-antiquark pairs. For the exotic antidecuplet baryons we obtain the 5-quark wave function.
|
hep-ph/9508235
|
Denis Perret-Gallix
|
Denis Perrer-Gallix (LAPP, IN2P3-CNRS)
|
Towards a Complete Feynman Diagrams Automatic Computation System
|
12 pages, Invited talk at the AIHENP-95 workshop
|
Int.J.Mod.Phys.C6:531-540,1995
|
10.1142/S0129183195000393
|
LAPP-EXP-95.06
|
hep-ph
| null |
Complete Feynman diagram automatic computation systems are now coming of age
after many years of development. They are made available to the high energy
physics community through user-friendly interfaces. Theorists and
experimentalists can benefit from these powerful packages for speeding up time
consuming calculations and for preparing event generators. The general
architecture of these packages is presented and the current development of the
one-loop diagrams extension is discussed. A rapid description of the prominent
packages and tools is then proposed. Finally, the necessity for defining a
standardization scheme is heavily stressed for the benefit of developers and
users.
|
[
{
"created": "Fri, 4 Aug 1995 18:24:59 GMT",
"version": "v1"
}
] |
2011-04-15
|
[
[
"Perrer-Gallix",
"Denis",
"",
"LAPP, IN2P3-CNRS"
]
] |
Complete Feynman diagram automatic computation systems are now coming of age after many years of development. They are made available to the high energy physics community through user-friendly interfaces. Theorists and experimentalists can benefit from these powerful packages for speeding up time consuming calculations and for preparing event generators. The general architecture of these packages is presented and the current development of the one-loop diagrams extension is discussed. A rapid description of the prominent packages and tools is then proposed. Finally, the necessity for defining a standardization scheme is heavily stressed for the benefit of developers and users.
|
2106.05298
|
Mathias Pierre
|
Enrique Fernandez-Martinez, Mathias Pierre, Emanuelle Pinsard and
Salvador Rosauro-Alcaraz
|
Inverse Seesaw, dark matter and the Hubble tension
|
22 pages, 2 figures
| null |
10.1140/epjc/s10052-021-09760-y
|
IFT-UAM/CSIC-21-64
|
hep-ph astro-ph.CO hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the inverse Seesaw scenario for neutrino masses with the
approximate Lepton number symmetry broken dynamically by a scalar with Lepton
number two. We show that the Majoron associated to the spontaneous symmetry
breaking can alleviate the Hubble tension through its contribution to $\Delta
N_\text{eff}$ and late decays to neutrinos. Among the additional fermionic
states required for realizing the inverse Seesaw mechanism, sterile neutrinos
at the keV-MeV scale can account for all the dark matter component of the
Universe if produced via freeze-in from the decays of heavier degrees of
freedom.
|
[
{
"created": "Wed, 9 Jun 2021 18:00:06 GMT",
"version": "v1"
}
] |
2021-11-17
|
[
[
"Fernandez-Martinez",
"Enrique",
""
],
[
"Pierre",
"Mathias",
""
],
[
"Pinsard",
"Emanuelle",
""
],
[
"Rosauro-Alcaraz",
"Salvador",
""
]
] |
We consider the inverse Seesaw scenario for neutrino masses with the approximate Lepton number symmetry broken dynamically by a scalar with Lepton number two. We show that the Majoron associated to the spontaneous symmetry breaking can alleviate the Hubble tension through its contribution to $\Delta N_\text{eff}$ and late decays to neutrinos. Among the additional fermionic states required for realizing the inverse Seesaw mechanism, sterile neutrinos at the keV-MeV scale can account for all the dark matter component of the Universe if produced via freeze-in from the decays of heavier degrees of freedom.
|
1202.4221
|
Premomoy Ghosh
|
Premomoy Ghosh
|
Negative binomial multiplicity distribution in proton-proton collisions
in limited pseudorapidity intervals at LHC up to sqrt (s) = 7 TeV and the
clan model
|
9 pages 8 figures. Accepted for publication in Physical Review D
| null |
10.1103/PhysRevD.85.054017
| null |
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Experiments at the Large Hadron Collider (LHC) have measured multiplicity
distributions in proton-proton collisions at a new domain of center-of-mass
energy ($\sqrt {s}$) in limited pseudorapidity intervals. We analyze
multiplicity distribution data of proton-proton collisions at LHC energies as
measured by the Compact Muon Solenoid (CMS) experiment in terms of
characteristic parameters of the Negative Binomial Distribution (NBD) function
that has played a significant role in describing multiplicity distribution data
of particle production in high energy physics experiments, in the pre-LHC
energy-range, in various kinds of collisions for a wide range of collision
energy and for different kinematic ranges. Beside a single NBD, we apply the
formalism of weighted superposition of two NBDs to examine if the multiplicity
distribution data of CMS could be better explained. The weighted superposition
of two NBDs indeed explain the distribution data better at the highest
available LHC energy and in large interval of phase space. The two-NBD
formalism further reveals that the energy invariance of the multiplicity
distribution of the "soft" component of particle production in hadronic
collisions is valid at LHC also, as it is at RHIC and Tevatron. We analyze the
data further in terms of clan parameters in the framework of the two-NBD model.
|
[
{
"created": "Mon, 20 Feb 2012 04:54:24 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Ghosh",
"Premomoy",
""
]
] |
Experiments at the Large Hadron Collider (LHC) have measured multiplicity distributions in proton-proton collisions at a new domain of center-of-mass energy ($\sqrt {s}$) in limited pseudorapidity intervals. We analyze multiplicity distribution data of proton-proton collisions at LHC energies as measured by the Compact Muon Solenoid (CMS) experiment in terms of characteristic parameters of the Negative Binomial Distribution (NBD) function that has played a significant role in describing multiplicity distribution data of particle production in high energy physics experiments, in the pre-LHC energy-range, in various kinds of collisions for a wide range of collision energy and for different kinematic ranges. Beside a single NBD, we apply the formalism of weighted superposition of two NBDs to examine if the multiplicity distribution data of CMS could be better explained. The weighted superposition of two NBDs indeed explain the distribution data better at the highest available LHC energy and in large interval of phase space. The two-NBD formalism further reveals that the energy invariance of the multiplicity distribution of the "soft" component of particle production in hadronic collisions is valid at LHC also, as it is at RHIC and Tevatron. We analyze the data further in terms of clan parameters in the framework of the two-NBD model.
|
2102.05366
|
Jan Sch\"utte-Engel
|
Jan Sch\"utte-Engel, David J. E. Marsh, Alexander J. Millar, Akihiko
Sekine, Francesca Chadha-Day, Sebastian Hoof, Mazhar Ali, Kin-Chung Fong,
Edward Hardy, and Libor \v{S}mejkal
|
Axion Quasiparticles for Axion Dark Matter Detection
|
78 pages + appendices, v2: reference list extended, added one more
case to fig 23
| null |
10.1088/1475-7516/2021/08/066
|
IPPP/20/78, NORDITA-2021-007
|
hep-ph cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been suggested that certain antiferromagnetic topological insulators
contain axion quasiparticles (AQs), and that such materials could be used to
detect axion dark matter (DM). The AQ is a longitudinal antiferromagnetic spin
fluctuation coupled to the electromagnetic Chern-Simons term, which, in the
presence of an applied magnetic field, leads to mass mixing between the AQ and
the electric field. The electromagnetic boundary conditions and transmission
and reflection coefficients are computed. A model for including losses into
this system is presented, and the resulting linewidth is computed. It is shown
how transmission spectroscopy can be used to measure the resonant frequencies
and damping coefficients of the material, and demonstrate conclusively the
existence of the AQ. The dispersion relation and boundary conditions permit
resonant conversion of axion DM into THz photons in a material volume that is
independent of the resonant frequency, which is tuneable via an applied
magnetic field. A parameter study for axion DM detection is performed,
computing boost amplitudes and bandwidths using realistic material properties
including loss. The proposal could allow for detection of axion DM in the mass
range between 1 and 10 meV using current and near future technology.
|
[
{
"created": "Wed, 10 Feb 2021 10:11:47 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Sep 2021 19:23:46 GMT",
"version": "v2"
}
] |
2021-09-08
|
[
[
"Schütte-Engel",
"Jan",
""
],
[
"Marsh",
"David J. E.",
""
],
[
"Millar",
"Alexander J.",
""
],
[
"Sekine",
"Akihiko",
""
],
[
"Chadha-Day",
"Francesca",
""
],
[
"Hoof",
"Sebastian",
""
],
[
"Ali",
"Mazhar",
""
],
[
"Fong",
"Kin-Chung",
""
],
[
"Hardy",
"Edward",
""
],
[
"Šmejkal",
"Libor",
""
]
] |
It has been suggested that certain antiferromagnetic topological insulators contain axion quasiparticles (AQs), and that such materials could be used to detect axion dark matter (DM). The AQ is a longitudinal antiferromagnetic spin fluctuation coupled to the electromagnetic Chern-Simons term, which, in the presence of an applied magnetic field, leads to mass mixing between the AQ and the electric field. The electromagnetic boundary conditions and transmission and reflection coefficients are computed. A model for including losses into this system is presented, and the resulting linewidth is computed. It is shown how transmission spectroscopy can be used to measure the resonant frequencies and damping coefficients of the material, and demonstrate conclusively the existence of the AQ. The dispersion relation and boundary conditions permit resonant conversion of axion DM into THz photons in a material volume that is independent of the resonant frequency, which is tuneable via an applied magnetic field. A parameter study for axion DM detection is performed, computing boost amplitudes and bandwidths using realistic material properties including loss. The proposal could allow for detection of axion DM in the mass range between 1 and 10 meV using current and near future technology.
|
hep-ph/9807252
|
Jacek Wosiek
|
A. Bialas, W. Czyz and J. Wosiek (Jagellonian University)
|
Studying thermodynamics in heavy ion collisions
|
12 pages, LaTeX with two eps figures
|
Acta Phys.Polon. B30 (1999) 107-117
| null |
TPJU-15/98
|
hep-ph
| null |
We discuss the possibility to measure entropy of the system created in heavy
ion collisions using the Ma coincidence method.
|
[
{
"created": "Mon, 6 Jul 1998 08:31:17 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bialas",
"A.",
"",
"Jagellonian University"
],
[
"Czyz",
"W.",
"",
"Jagellonian University"
],
[
"Wosiek",
"J.",
"",
"Jagellonian University"
]
] |
We discuss the possibility to measure entropy of the system created in heavy ion collisions using the Ma coincidence method.
|
hep-ph/0109238
|
Jonathan L. Rosner
|
Michael Gronau and Jonathan L. Rosner
|
Implications of CP Asymmetry Limits for $B \to K \pi$ and $B \to \pi
\pi$
|
16 pages, LaTeX, 3 figures, revised version to be published in Phys.
Rev. D. References added and updated
|
Phys.Rev.D65:013004,2002; Erratum-ibid.D65:079901,2002
|
10.1103/PhysRevD.65.013004 10.1103/PhysRevD.65.079901
|
TECHNION-PH-2001-35, EFI 01-42
|
hep-ph
| null |
Recent experimental limits for the direct CP asymmetries in $B^0 \to K^+
\pi^-$, $B^+ \to K^+ \pi^0$, $B^+ \to K^0 \pi^+$, and $B^0 \to \pi^+ \pi^-$,
and for the indirect CP asymmetry in $B^0 \to \pi^+ \pi^-$, are combined with
information on CP-averaged branching ratios to shed light on weak and strong
phases. At present such bounds favor $\gamma \ge 60^\circ$ at the $1 \sigma$
level. The prospects for further improvements are discussed.
|
[
{
"created": "Tue, 25 Sep 2001 17:18:21 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2001 20:15:00 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Gronau",
"Michael",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] |
Recent experimental limits for the direct CP asymmetries in $B^0 \to K^+ \pi^-$, $B^+ \to K^+ \pi^0$, $B^+ \to K^0 \pi^+$, and $B^0 \to \pi^+ \pi^-$, and for the indirect CP asymmetry in $B^0 \to \pi^+ \pi^-$, are combined with information on CP-averaged branching ratios to shed light on weak and strong phases. At present such bounds favor $\gamma \ge 60^\circ$ at the $1 \sigma$ level. The prospects for further improvements are discussed.
|
1402.7188
|
Takeshi Araki
|
Takeshi Araki, Eiichi Takasugi
|
Effects on sin\theta_{12} from perturbation of the neutrino mixing
matrix with the partially degenerated neutrino masses
|
v1: 14 pages, 6 figures; v2: minor changes, references added, 16
pages, 6 figures
| null |
10.1093/ptep/ptu053
|
MISC-2014-02
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a situation where the leading-order neutrino mass matrix is
derived by a theoretical ansatz and reproduces the experimental data well, but
not completely. Then, the next stage is to try to fully reproduce the data by
adding small perturbation terms. In this paper, we obtain the analytical method
to diagonalize the perturbed mass matrix and find a consistency condition that
parameters should satisfy not to change \sin\theta_{12} much. This condition
could cause parameter tuning and plays a crucial role in relating the added
perturbation terms with the prediction analytically, in particular, for the
case of the partially quasi-degenerated neutrino masses (m_2 \simeq m_1) where
neutrinoless double beta decays would be observed in the phase-II experiments.
|
[
{
"created": "Fri, 28 Feb 2014 10:34:58 GMT",
"version": "v1"
},
{
"created": "Fri, 9 May 2014 08:19:22 GMT",
"version": "v2"
}
] |
2016-06-21
|
[
[
"Araki",
"Takeshi",
""
],
[
"Takasugi",
"Eiichi",
""
]
] |
We consider a situation where the leading-order neutrino mass matrix is derived by a theoretical ansatz and reproduces the experimental data well, but not completely. Then, the next stage is to try to fully reproduce the data by adding small perturbation terms. In this paper, we obtain the analytical method to diagonalize the perturbed mass matrix and find a consistency condition that parameters should satisfy not to change \sin\theta_{12} much. This condition could cause parameter tuning and plays a crucial role in relating the added perturbation terms with the prediction analytically, in particular, for the case of the partially quasi-degenerated neutrino masses (m_2 \simeq m_1) where neutrinoless double beta decays would be observed in the phase-II experiments.
|
1403.4284
|
Andrzej Czarnecki
|
Yi Liang, Paul L. McGrath and Andrzej Czarnecki
|
Anomalous magnetic moment of the positronium ion
|
7 pages
| null |
10.1088/1367-2630/16/6/063045
|
Alberta Thy 6-14
|
hep-ph physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determine the gyromagnetic factor of the positronium ion, a three-body
system consisting of two electrons and a positron, including first relativistic
corrections. We find that the g-factor is modified by a term -0.51(1)alpha^2,
exceeding 15 times the alpha^2 correction for a free electron. We compare this
effect with analogous results found previously in atomic positronium and in
hydrogen-like ions.
|
[
{
"created": "Mon, 17 Mar 2014 22:04:29 GMT",
"version": "v1"
}
] |
2015-06-19
|
[
[
"Liang",
"Yi",
""
],
[
"McGrath",
"Paul L.",
""
],
[
"Czarnecki",
"Andrzej",
""
]
] |
We determine the gyromagnetic factor of the positronium ion, a three-body system consisting of two electrons and a positron, including first relativistic corrections. We find that the g-factor is modified by a term -0.51(1)alpha^2, exceeding 15 times the alpha^2 correction for a free electron. We compare this effect with analogous results found previously in atomic positronium and in hydrogen-like ions.
|
2211.06347
|
John Hardin
|
J.M.Hardin
|
Wilks's Theorem, Global Fits, and Neutrino Oscillations
|
Updates addressing reviewer comments
|
2024 Eur. J. Phys. 45 025806
|
10.1088/1361-6404/ad261d
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Tests of models for new physics appearing in neutrino experiments often
involve global fits to a quantum mechanical effect called neutrino
oscillations. This paper introduces students to methods commonly used in these
global fits starting from an understanding of more conventional fitting methods
using log-likelihood and $\chi^2$ minimization. Specifically, we discuss how
the $\Delta\chi^2$, which compares the $\chi^2$ of the fit with the new physics
to the $\chi^2$ of the Standard Model prediction, is often interpreted using
Wilks's theorem. This paper uses toy models to explore the properties of
$\Delta\chi^2$ as a test statistic for oscillating functions. The statistics of
such models are shown to deviate from Wilks's theorem. Tests for new physics
also often examine data subsets for "tension" called the "parameter goodness of
fit". In this paper, we explain this approach and use toy models to examine the
validity of the probabilities from this test also. Although we have chosen a
specific scenario -- neutrino oscillations -- to illustrate important points,
students should keep in mind that these points are widely applicable when
fitting multiple data sets to complex functions.
|
[
{
"created": "Fri, 11 Nov 2022 16:48:15 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2024 15:05:00 GMT",
"version": "v2"
}
] |
2024-08-09
|
[
[
"Hardin",
"J. M.",
""
]
] |
Tests of models for new physics appearing in neutrino experiments often involve global fits to a quantum mechanical effect called neutrino oscillations. This paper introduces students to methods commonly used in these global fits starting from an understanding of more conventional fitting methods using log-likelihood and $\chi^2$ minimization. Specifically, we discuss how the $\Delta\chi^2$, which compares the $\chi^2$ of the fit with the new physics to the $\chi^2$ of the Standard Model prediction, is often interpreted using Wilks's theorem. This paper uses toy models to explore the properties of $\Delta\chi^2$ as a test statistic for oscillating functions. The statistics of such models are shown to deviate from Wilks's theorem. Tests for new physics also often examine data subsets for "tension" called the "parameter goodness of fit". In this paper, we explain this approach and use toy models to examine the validity of the probabilities from this test also. Although we have chosen a specific scenario -- neutrino oscillations -- to illustrate important points, students should keep in mind that these points are widely applicable when fitting multiple data sets to complex functions.
|
1005.1938
|
Shamayita Ray Dr.
|
Shamayita Ray (Cornell U., LEPP)
|
Renormalization group evolution of neutrino masses and mixing in seesaw
models: A review
|
54 pages. Invited review submitted to IJMPA
|
Int.J.Mod.Phys.A25:4339-4384,2010
|
10.1142/S0217751X10049839
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider different extensions of the standard model which can give rise to
the small active neutrino masses through seesaw mechanisms, and their mixing.
These tiny neutrino masses are generated at some high energy scale by the heavy
seesaw fields which then get sequentially decoupled to give an effective
dimension-5 operator. The renormalization group evolution of the masses and the
mixing parameters of the three active neutrinos in the high energy as well as
the low energy effective theory is reviewed in this article.
|
[
{
"created": "Tue, 11 May 2010 20:27:52 GMT",
"version": "v1"
}
] |
2015-03-17
|
[
[
"Ray",
"Shamayita",
"",
"Cornell U., LEPP"
]
] |
We consider different extensions of the standard model which can give rise to the small active neutrino masses through seesaw mechanisms, and their mixing. These tiny neutrino masses are generated at some high energy scale by the heavy seesaw fields which then get sequentially decoupled to give an effective dimension-5 operator. The renormalization group evolution of the masses and the mixing parameters of the three active neutrinos in the high energy as well as the low energy effective theory is reviewed in this article.
|
1512.03364
|
Francesco Giovanni Celiberto
|
F. Caporale, Francesco Giovanni Celiberto, G. Chachamis, A. Sabio Vera
|
Multi-Regge kinematics and azimuthal angle observables for inclusive
four-jet production
|
13 pages, 4 figures
| null |
10.1140/epjc/s10052-016-3963-6
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We evaluate differential cross sections for production of four jets in
multi-Regge kinematics at a hadron collider. The main focus lies on azimuthal
angle dependences. As in previous studies, the ratios of correlation functions
of products of cosines of azimuthal angle differences among the tagged jets
offer us the cleanest quantities to compare with experimental data. The
calculations are based on the jet production from a single BFKL ladder with a
convolution of three BFKL Green functions where we always have two
forward/backward jets tagged in the final state. We also demand the tagging of
two further jets in more central regions of the detectors with a relative
separation in rapidity from each other, plus the inclusive production of an
arbitrary number of mini-jets. We show that dependences on the transverse
momenta and rapidity of the two central jets can be a distinct signal of the
onset of BFKL dynamics.
|
[
{
"created": "Thu, 10 Dec 2015 18:40:00 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2017 18:25:16 GMT",
"version": "v2"
}
] |
2017-01-26
|
[
[
"Caporale",
"F.",
""
],
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Chachamis",
"G.",
""
],
[
"Vera",
"A. Sabio",
""
]
] |
We evaluate differential cross sections for production of four jets in multi-Regge kinematics at a hadron collider. The main focus lies on azimuthal angle dependences. As in previous studies, the ratios of correlation functions of products of cosines of azimuthal angle differences among the tagged jets offer us the cleanest quantities to compare with experimental data. The calculations are based on the jet production from a single BFKL ladder with a convolution of three BFKL Green functions where we always have two forward/backward jets tagged in the final state. We also demand the tagging of two further jets in more central regions of the detectors with a relative separation in rapidity from each other, plus the inclusive production of an arbitrary number of mini-jets. We show that dependences on the transverse momenta and rapidity of the two central jets can be a distinct signal of the onset of BFKL dynamics.
|
hep-ph/9701232
|
Tomohiro Matsuda
|
Tomohiro Matsuda
|
A natural solution to the $\mu$-problem in dynamical supergravity model
|
6 pages, Latex, accepted for publication in Phys.Rev.D
|
Phys.Rev. D58 (1998) 035004
|
10.1103/PhysRevD.58.035004
|
UT-766
|
hep-ph
| null |
The Higgs mixing term coefficient $\mu$ is calculated in the supersymmetric
theory which possesses a non-anomalous $U(1)_{R}$ symmetry in the limit of
global supersymmetry. In this model, supersymmetry is assumed to be broken by
gaugino condensation in the hidden sector when the supergravity effects are
turned on. The soft breaking terms in the visible sector and the $\mu$ term of
order the weak scale are produced in a simple manner.
|
[
{
"created": "Tue, 7 Jan 1997 03:48:26 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jul 1997 02:37:03 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Oct 1997 02:56:00 GMT",
"version": "v3"
},
{
"created": "Wed, 29 Apr 1998 05:32:59 GMT",
"version": "v4"
}
] |
2009-10-30
|
[
[
"Matsuda",
"Tomohiro",
""
]
] |
The Higgs mixing term coefficient $\mu$ is calculated in the supersymmetric theory which possesses a non-anomalous $U(1)_{R}$ symmetry in the limit of global supersymmetry. In this model, supersymmetry is assumed to be broken by gaugino condensation in the hidden sector when the supergravity effects are turned on. The soft breaking terms in the visible sector and the $\mu$ term of order the weak scale are produced in a simple manner.
|
1008.3638
|
Dmitri Antonov
|
D. Antonov, J.E.F.T. Ribeiro, A.V. Nefediev
|
QCD relics from the early Universe
|
30 pages, 4 figures
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest the possibility of creation in the early Universe of stable
domains of radius a few kilometers wide, formed by coherently excited states of
$\pi$-mesons. Such domains appear dark to an external observer, since the decay
rate of the said coherent pionic states into photons is vanishingly small. The
related thermal insulation of the domains from the outer world could have
allowed them to survive till present days. The estimated maximum radius and the
period of rotation of such objects turn out to be compatible with those of
certain pulsars.
|
[
{
"created": "Sat, 21 Aug 2010 15:18:00 GMT",
"version": "v1"
}
] |
2010-08-24
|
[
[
"Antonov",
"D.",
""
],
[
"Ribeiro",
"J. E. F. T.",
""
],
[
"Nefediev",
"A. V.",
""
]
] |
We suggest the possibility of creation in the early Universe of stable domains of radius a few kilometers wide, formed by coherently excited states of $\pi$-mesons. Such domains appear dark to an external observer, since the decay rate of the said coherent pionic states into photons is vanishingly small. The related thermal insulation of the domains from the outer world could have allowed them to survive till present days. The estimated maximum radius and the period of rotation of such objects turn out to be compatible with those of certain pulsars.
|
hep-ph/0011161
| null |
Tao Huang, Zuo-Hong Li, Xiang-Yao Wu
|
Improved approach to the heavy-to-light form factors in the light-cone
QCD sum
|
New version to appear in PRD
| null |
10.1103/PhysRevD.63.094001
| null |
hep-ph
| null |
A systematic analysis shows that the main uncertainties in the form factors
are due to the twist-3 wave functions of the light mesons in the light-cone QCD
sum rules. We propose an improved approach, in which the twist-3 wave functions
doesn't make any contribution and therefore the possible pollution by them can
be avoided, to re-examine $B \to \pi$ semileptonic form factors. Also, a
comparison between the previous and our results from the light-cone QCD sum
rules is made. Our method will be beneficial to the precise extracting of
$\mid{V_{ub}}\mid$ from the experimental data on the processes $B \to \pi \ell
\widetilde{\nu_\ell}$.
|
[
{
"created": "Mon, 13 Nov 2000 03:37:02 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2001 13:40:19 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Huang",
"Tao",
""
],
[
"Li",
"Zuo-Hong",
""
],
[
"Wu",
"Xiang-Yao",
""
]
] |
A systematic analysis shows that the main uncertainties in the form factors are due to the twist-3 wave functions of the light mesons in the light-cone QCD sum rules. We propose an improved approach, in which the twist-3 wave functions doesn't make any contribution and therefore the possible pollution by them can be avoided, to re-examine $B \to \pi$ semileptonic form factors. Also, a comparison between the previous and our results from the light-cone QCD sum rules is made. Our method will be beneficial to the precise extracting of $\mid{V_{ub}}\mid$ from the experimental data on the processes $B \to \pi \ell \widetilde{\nu_\ell}$.
|
1703.04759
|
Nikita Blinov
|
Nikita Blinov and Anson Hook
|
Particle Asymmetries from Quantum Statistics
|
Minor changes to match journal version
|
Phys. Rev. D 95, 095014 (2017)
|
10.1103/PhysRevD.95.095014
|
SLAC-PUB-16936
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a class of baryogenesis models where the Lagrangian in the
visible sector is Charge-Parity (CP) invariant and a baryon asymmetry is
produced only when quantum statistics is taken into account. The CP symmetry is
broken by matter effects, namely the assumption that the primordial plasma
contains another asymmetric species, such as dark matter. Out-of-equilibrium
baryon number violating decays can then generate an asymmetry through Bose
enhancement and/or Pauli blocking of certain decay channels.
|
[
{
"created": "Tue, 14 Mar 2017 22:14:32 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2017 17:13:29 GMT",
"version": "v2"
}
] |
2017-05-24
|
[
[
"Blinov",
"Nikita",
""
],
[
"Hook",
"Anson",
""
]
] |
We consider a class of baryogenesis models where the Lagrangian in the visible sector is Charge-Parity (CP) invariant and a baryon asymmetry is produced only when quantum statistics is taken into account. The CP symmetry is broken by matter effects, namely the assumption that the primordial plasma contains another asymmetric species, such as dark matter. Out-of-equilibrium baryon number violating decays can then generate an asymmetry through Bose enhancement and/or Pauli blocking of certain decay channels.
|
hep-ph/0201024
|
Gilberto Tavares Velasco
|
F. Larios, M.A. Perez, G. Tavares-Velasco
|
Constraints on neutrino-photon interactions from rare Z decays
|
11 pages, 5 figures, elsart format
|
Phys.Lett. B531 (2002) 231-236
|
10.1016/S0370-2693(02)01494-6
| null |
hep-ph
| null |
It is shown that the rare decays $Z \to \nu \bar{nu} \gamma$ and $Z \to \nu
\bar{\nu} \gamma \gamma$ are useful to put model-independent bounds on
neutrino-one-photon and neutrino-two-photon interactions. The results are then
used to constrain the $\tau$ neutrino magnetic moment and the double radiative
decay $\nu_j \to \nu_i \gamma \gamma$. It is found that the decay $Z \to \nu
\bar{nu} \gamma$ gives a more stringent bound on the $\tau$ neutrino magnetic
moment than that obtained from $Z \to \nu \bar{\nu} \gamma \gamma$; the latter
decay in turn gives limits on the neutrino-two-photon interaction that are less
stringent than those obtained for a sterile neutrino $\nu_s$ from the analysis
of $\nu_\mu N \to \nu_s N$ conversion.
|
[
{
"created": "Fri, 4 Jan 2002 21:54:31 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Larios",
"F.",
""
],
[
"Perez",
"M. A.",
""
],
[
"Tavares-Velasco",
"G.",
""
]
] |
It is shown that the rare decays $Z \to \nu \bar{nu} \gamma$ and $Z \to \nu \bar{\nu} \gamma \gamma$ are useful to put model-independent bounds on neutrino-one-photon and neutrino-two-photon interactions. The results are then used to constrain the $\tau$ neutrino magnetic moment and the double radiative decay $\nu_j \to \nu_i \gamma \gamma$. It is found that the decay $Z \to \nu \bar{nu} \gamma$ gives a more stringent bound on the $\tau$ neutrino magnetic moment than that obtained from $Z \to \nu \bar{\nu} \gamma \gamma$; the latter decay in turn gives limits on the neutrino-two-photon interaction that are less stringent than those obtained for a sterile neutrino $\nu_s$ from the analysis of $\nu_\mu N \to \nu_s N$ conversion.
|
hep-ph/0506134
|
Olena Linnyk
|
O. Linnyk, K. Gallmeister, S. Leupold, U. Mosel
|
Prediction for the transverse momentum distribution of Drell-Yan
dileptons at GSI-PANDA
|
4 pages, 7 figures, RevTex; the published version: typos corrected,
minor changes to the text
|
Phys.Rev.D73:037502,2006
|
10.1103/PhysRevD.73.037502
| null |
hep-ph nucl-th
| null |
We predict the triple differential cross section of the Drell-Yan process
(pbar p -> l^+l^-X) in the kinematical regimes relevant for the upcoming PANDA
experiment, using a model that accounts for quark virtuality as well as
primordial transverse momentum. We find a cross section magnitude of up to 10
nb in the low mass region. A measurement with 10% accuracy is desirable in
order to constrain the partonic transverse momentum dispersion and the spectral
function width within +-50 MeV and to study their evolution with M and sqrt(s).
|
[
{
"created": "Tue, 14 Jun 2005 12:25:47 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2005 13:36:51 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Mar 2006 17:56:02 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Linnyk",
"O.",
""
],
[
"Gallmeister",
"K.",
""
],
[
"Leupold",
"S.",
""
],
[
"Mosel",
"U.",
""
]
] |
We predict the triple differential cross section of the Drell-Yan process (pbar p -> l^+l^-X) in the kinematical regimes relevant for the upcoming PANDA experiment, using a model that accounts for quark virtuality as well as primordial transverse momentum. We find a cross section magnitude of up to 10 nb in the low mass region. A measurement with 10% accuracy is desirable in order to constrain the partonic transverse momentum dispersion and the spectral function width within +-50 MeV and to study their evolution with M and sqrt(s).
|
1108.5178
|
Jing Shao
|
Gordon Kane, Jing Shao, Scott Watson and Hai-Bo Yu
|
The Baryon-Dark Matter Ratio Via Moduli Decay After Affleck-Dine
Baryogenesis
|
12 pages, no figure. v2: references added
| null |
10.1088/1475-7516/2011/11/012
|
MCTP-11-33
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Low-scale supersymmetry breaking in string motivated theories implies the
presence of O(100) TeV scale moduli, which generically lead to a significant
modification of the history of the universe prior to Big Bang Nucleosynthesis.
Such an approach implies a non-thermal origin for dark matter resulting from
scalar decay, where the lightest supersymmetric particle can account for the
observed dark matter relic density. We study the further effect of the decay on
the baryon asymmetry of the universe, and find that this can satisfactorily
address the problem of the over-production of the baryon asymmetry by the
Affleck-Dine mechanism in the MSSM. Remarkably, there is a natural connection
between the baryon and dark matter abundances today, which leads to a solution
of the `Cosmic Coincidence Problem'.
|
[
{
"created": "Thu, 25 Aug 2011 20:00:16 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Sep 2011 18:37:54 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Kane",
"Gordon",
""
],
[
"Shao",
"Jing",
""
],
[
"Watson",
"Scott",
""
],
[
"Yu",
"Hai-Bo",
""
]
] |
Low-scale supersymmetry breaking in string motivated theories implies the presence of O(100) TeV scale moduli, which generically lead to a significant modification of the history of the universe prior to Big Bang Nucleosynthesis. Such an approach implies a non-thermal origin for dark matter resulting from scalar decay, where the lightest supersymmetric particle can account for the observed dark matter relic density. We study the further effect of the decay on the baryon asymmetry of the universe, and find that this can satisfactorily address the problem of the over-production of the baryon asymmetry by the Affleck-Dine mechanism in the MSSM. Remarkably, there is a natural connection between the baryon and dark matter abundances today, which leads to a solution of the `Cosmic Coincidence Problem'.
|
hep-ph/9503246
|
Joannis Papavassiliou
|
JOANNIS PAPAVASSILIOU and KOSTAS PHILIPPIDES
|
GAUGE INVARIANCE AND ANOMALOUS GAUGE BOSON COUPLINGS
|
Latex with all special macros included, 5 pages, no figures To appear
in the Conference Proceedings for BEYOND THE STANDARD MODEL IV, Granlibakken,
Lake Tahoe, Dec 13-18, 1994, hosted by Davis Institute for High Energy
Physics. Talk presented By J. Papavassiliou.
| null | null | null |
hep-ph
| null |
Using the S--matrix pinch technique we obtain to one loop order, gauge
independent $\gamma W^-W^+$ and $Z W^-W^+$ vertices in the context of the
standard model, with all incoming momenta off--shell. We show that the vertices
so constructed satisfy simple QED--like Ward identities. These gauge invariant
vertices give rise to expressions for the magnetic dipole and electric
quadrupole form factors of the W gauge boson, which, unlike previous
treatments, satisfy the crucial properties of infrared finiteness and
perturbative unitarity.
|
[
{
"created": "Mon, 6 Mar 1995 21:46:10 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"PAPAVASSILIOU",
"JOANNIS",
""
],
[
"PHILIPPIDES",
"KOSTAS",
""
]
] |
Using the S--matrix pinch technique we obtain to one loop order, gauge independent $\gamma W^-W^+$ and $Z W^-W^+$ vertices in the context of the standard model, with all incoming momenta off--shell. We show that the vertices so constructed satisfy simple QED--like Ward identities. These gauge invariant vertices give rise to expressions for the magnetic dipole and electric quadrupole form factors of the W gauge boson, which, unlike previous treatments, satisfy the crucial properties of infrared finiteness and perturbative unitarity.
|
2107.00859
|
Danny Marfatia
|
Danny Marfatia, Po-Yan Tseng
|
Correlated gravitational wave and microlensing signals of macroscopic
dark matter
|
16 pages, 7 figures, 1 table. Version to appear in JHEP
|
JHEP 2111:068 (2021)
|
10.1007/JHEP11(2021)068
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Fermion dark matter particles can aggregate to form extended dark matter
structures via a first-order phase transition in which the particles get
trapped in the false vacuum. We study Fermi balls created in a phase transition
induced by a generic quartic thermal effective potential. We show that for
Fermi balls of mass, $3\times 10^{-12}M_\odot \lesssim M_{\rm FB} \lesssim
10^{-5}M_\odot$, correlated observations of gravitational waves produced during
the phase transition (at SKA/THEIA/$\mu$Ares), and gravitational microlensing
caused by Fermi balls (at Subaru-HSC), can be made.
|
[
{
"created": "Fri, 2 Jul 2021 06:28:42 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Oct 2021 16:19:25 GMT",
"version": "v2"
}
] |
2021-11-11
|
[
[
"Marfatia",
"Danny",
""
],
[
"Tseng",
"Po-Yan",
""
]
] |
Fermion dark matter particles can aggregate to form extended dark matter structures via a first-order phase transition in which the particles get trapped in the false vacuum. We study Fermi balls created in a phase transition induced by a generic quartic thermal effective potential. We show that for Fermi balls of mass, $3\times 10^{-12}M_\odot \lesssim M_{\rm FB} \lesssim 10^{-5}M_\odot$, correlated observations of gravitational waves produced during the phase transition (at SKA/THEIA/$\mu$Ares), and gravitational microlensing caused by Fermi balls (at Subaru-HSC), can be made.
|
1402.4079
|
Emilia Lewandowska
|
Krzysztof Golec-Biernat, Emilia Lewandowska
|
How to impose initial conditions for QCD evolution of double parton
distributions?
|
7 pages, version accepted for publication in Phys. Rev. D
|
Phys. Rev. D 90, 014032 (2014)
|
10.1103/PhysRevD.90.014032
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Double parton distribution functions (DPDFs) are used in the QCD description
of double parton scattering. The DPDFs evolve with hard scales through QCD
evolution equations which obey nontrivial momentum and valence quark number sum
rules. We describe an attempt to construct initial conditions for the evolution
equations which exactly fulfil these sum rules and discuss its shortcomings. We
also discuss the factorization of the DPDFs into a product of two single parton
distribution functions at small values of the parton momentum fractions.
|
[
{
"created": "Mon, 17 Feb 2014 17:41:44 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Apr 2014 15:05:27 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Jul 2014 11:41:42 GMT",
"version": "v3"
}
] |
2014-07-30
|
[
[
"Golec-Biernat",
"Krzysztof",
""
],
[
"Lewandowska",
"Emilia",
""
]
] |
Double parton distribution functions (DPDFs) are used in the QCD description of double parton scattering. The DPDFs evolve with hard scales through QCD evolution equations which obey nontrivial momentum and valence quark number sum rules. We describe an attempt to construct initial conditions for the evolution equations which exactly fulfil these sum rules and discuss its shortcomings. We also discuss the factorization of the DPDFs into a product of two single parton distribution functions at small values of the parton momentum fractions.
|
1706.06138
|
Qin Chang
|
Qin Chang, Xiao-Nan Li, Xin-Qiang Li and Jun-Feng Sun
|
Study of the weak annihilation contributions in charmless $B_s\to VV$
decays
|
31 pages, 4 figures, 6 tables
| null |
10.1140/epjc/s10052-017-4980-9
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, in order to probe the spectator-scattering and weak
annihilation contributions in charmless $B_s\to VV$ (where $V$ stands for a
light vector meson) decays, we perform the $\chi^2$-analyses for the end-point
parameters within the QCD factorization framework, under the constraints from
the measured $\bar B_{s}\to$$\rho^0\phi$, $\phi K^{*0}$, $\phi \phi$ and
$K^{*0}\bar K^{*0}$ decays. The fitted results indicate that the end-point
parameters in the factorizable and nonfactorizable annihilation topologies are
non-universal, which is also favored by the charmless $B\to PP$ and $PV$ (where
$P$ stands for a light pseudo-scalar meson) decays observed in the previous
work. Moreover, the abnormal polarization fractions $f_{L,\bot}(\bar B_{s}\to
K^{*0}\bar K^{*0})=(20.1\pm7.0)\%\,,(58.4\pm8.5)\%$ measured by the LHCb
collaboration can be reconciled through the weak annihilation corrections.
However, the branching ratio of $\bar B_{s}\to\phi K^{*0}$ decay exhibits a
tension between the data and theoretical result, which dominates the
contributions to $\chi_{\rm min}^2$ in the fits. Using the fitted end-point
parameters, we update the theoretical results for the charmless $B_s\to VV$
decays, which will be further tested by the LHCb and Belle-II experiments in
the near future.
|
[
{
"created": "Mon, 19 Jun 2017 18:55:25 GMT",
"version": "v1"
}
] |
2017-08-02
|
[
[
"Chang",
"Qin",
""
],
[
"Li",
"Xiao-Nan",
""
],
[
"Li",
"Xin-Qiang",
""
],
[
"Sun",
"Jun-Feng",
""
]
] |
In this paper, in order to probe the spectator-scattering and weak annihilation contributions in charmless $B_s\to VV$ (where $V$ stands for a light vector meson) decays, we perform the $\chi^2$-analyses for the end-point parameters within the QCD factorization framework, under the constraints from the measured $\bar B_{s}\to$$\rho^0\phi$, $\phi K^{*0}$, $\phi \phi$ and $K^{*0}\bar K^{*0}$ decays. The fitted results indicate that the end-point parameters in the factorizable and nonfactorizable annihilation topologies are non-universal, which is also favored by the charmless $B\to PP$ and $PV$ (where $P$ stands for a light pseudo-scalar meson) decays observed in the previous work. Moreover, the abnormal polarization fractions $f_{L,\bot}(\bar B_{s}\to K^{*0}\bar K^{*0})=(20.1\pm7.0)\%\,,(58.4\pm8.5)\%$ measured by the LHCb collaboration can be reconciled through the weak annihilation corrections. However, the branching ratio of $\bar B_{s}\to\phi K^{*0}$ decay exhibits a tension between the data and theoretical result, which dominates the contributions to $\chi_{\rm min}^2$ in the fits. Using the fitted end-point parameters, we update the theoretical results for the charmless $B_s\to VV$ decays, which will be further tested by the LHCb and Belle-II experiments in the near future.
|
hep-ph/9606470
|
Dirk Graudenz
|
Dirk Graudenz (CERN)
|
Charged-Meson Production and Scaling Violations of Fragmentation
Functions in Deeply Inelastic Scattering at HERA
|
10 pages (Latex); figures are included via epsfig. A style file
derived from ``elsart.sty'' is included, as well as the ``elsart12.sty''
file. The AMSTEX fonts are required
|
Phys.Lett. B406 (1997) 178-183
|
10.1016/S0370-2693(97)00667-9
|
CERN-TH/96-155
|
hep-ph
| null |
We compare recent experimental results for one-particle-inclusive processes
in deeply inelastic scattering at HERA with theoretical predictions in
next-to-leading-order QCD perturbation theory, and study the factorization
scale dependence of cross sections and charged multiplicities. In the future,
for the HERA machine running at design luminosity, scaling violations of
fragmentation functions permit the measurement of the strong coupling constant.
We estimate the size of the statistical error of $\alpha_s$ that can be
achieved, and study the theoretical error due to the various parton density
parametrizations and due to the factorization scale dependence.
|
[
{
"created": "Fri, 28 Jun 1996 10:21:26 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Graudenz",
"Dirk",
"",
"CERN"
]
] |
We compare recent experimental results for one-particle-inclusive processes in deeply inelastic scattering at HERA with theoretical predictions in next-to-leading-order QCD perturbation theory, and study the factorization scale dependence of cross sections and charged multiplicities. In the future, for the HERA machine running at design luminosity, scaling violations of fragmentation functions permit the measurement of the strong coupling constant. We estimate the size of the statistical error of $\alpha_s$ that can be achieved, and study the theoretical error due to the various parton density parametrizations and due to the factorization scale dependence.
|
hep-ph/9405245
|
Ed Stoeffhaas
|
V.Barger, M.S.Berger, P.Ohmann and R.J.N.Phillips
|
Multilepton SUSY signals from R-parity violation at the Tevatron
|
12 pages. Uses Revtex style files (available through hep-ph). 5
postscript figures included (uufiled). RAL-94-047, MAD/PH/831
|
Phys.Rev.D50:4299-4305,1994
|
10.1103/PhysRevD.50.4299
| null |
hep-ph
| null |
The expected trilepton signals from $p \bar p \to \chi^\pm_1\chi^0_2 \to
(\chi^0_1\ell^\pm\nu) (\chi^0_1\ell'^+\ell'^-) $ will be converted into
hadronically quiet multilepton signals, if the two final $\chi^0_1$ have
leptonic $R$-parity-violating (RPV) decays $\chi^0_1 \to \ell \ell' \nu$. We
make illustrative calculations of the acceptance for these spectacular RPV
signals, and point out that distinctive multilepton signals are possible even
when the $R$-conserving trilepton signals are blocked by the ``spoiler mode"
$\chi^0_2 \to h^0 \chi^0_1$. Other channels such as $p\bar p\to \chi_1^\pm
\chi_2^0 \to (\chi_1^0\ell^\pm\nu) (\chi_1^0\nu\nu)$, $p\bar p\to \chi_1^\pm
\chi_1^0 \to (\chi_1^0\ell\nu)\chi_1^0$ and $p\bar
p\to\chi_1^+\chi_1^-\to(\chi_1^0\ell^+\nu)(\chi_1^0\ell'^-\nu)$ can also give
quiet multileptons from RPV. We investigate these signals in the context of
supersymmetric models with radiative electroweak symmetry breaking, using
examples in the low-$\tan\beta$ $\lambda_t$ fixed-point region.
|
[
{
"created": "Fri, 6 May 1994 20:44:43 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Barger",
"V.",
""
],
[
"Berger",
"M. S.",
""
],
[
"Ohmann",
"P.",
""
],
[
"Phillips",
"R. J. N.",
""
]
] |
The expected trilepton signals from $p \bar p \to \chi^\pm_1\chi^0_2 \to (\chi^0_1\ell^\pm\nu) (\chi^0_1\ell'^+\ell'^-) $ will be converted into hadronically quiet multilepton signals, if the two final $\chi^0_1$ have leptonic $R$-parity-violating (RPV) decays $\chi^0_1 \to \ell \ell' \nu$. We make illustrative calculations of the acceptance for these spectacular RPV signals, and point out that distinctive multilepton signals are possible even when the $R$-conserving trilepton signals are blocked by the ``spoiler mode" $\chi^0_2 \to h^0 \chi^0_1$. Other channels such as $p\bar p\to \chi_1^\pm \chi_2^0 \to (\chi_1^0\ell^\pm\nu) (\chi_1^0\nu\nu)$, $p\bar p\to \chi_1^\pm \chi_1^0 \to (\chi_1^0\ell\nu)\chi_1^0$ and $p\bar p\to\chi_1^+\chi_1^-\to(\chi_1^0\ell^+\nu)(\chi_1^0\ell'^-\nu)$ can also give quiet multileptons from RPV. We investigate these signals in the context of supersymmetric models with radiative electroweak symmetry breaking, using examples in the low-$\tan\beta$ $\lambda_t$ fixed-point region.
|
0812.1337
|
Matthias Steinhauser
|
K.G. Chetyrkin, B.A. Kniehl, M. Steinhauser
|
Strong-Coupling Constant at Three Loops in Momentum Subtraction Scheme
|
17 pages, 5 figures
|
Nucl.Phys.B814:231-245,2009
|
10.1016/j.nuclphysb.2009.01.026
|
DESY 08-184, SFB/CPP-08-92, TTP08-50
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we compute the three-loop corrections to the $\beta$ function
in a momentum subtraction (MOM) scheme with a massive quark. The calculation is
performed in the background field formalism applying asymptotic expansions for
small and large momenta. Special emphasis is devoted to the relation between
the coupling constant in the MOM and $\overline{\rm{MS}}$ schemes as well as
their ability to describe the phenomenon of decoupling.
It is demonstrated by an explicit comparison that the $\overline{\rm{MS}}$
scheme can be consistently used to relate the values of the MOM-scheme
strong-coupling constant in the energy regions higher and lower than the
massive-quark production threshold. This procedure obviates the necessity to
know the full mass dependence of the MOM $\beta$ function and clearly
demonstrates the equivalence of both schemes for the description of physics
outside the threshold region.
|
[
{
"created": "Sun, 7 Dec 2008 11:17:40 GMT",
"version": "v1"
}
] |
2010-04-23
|
[
[
"Chetyrkin",
"K. G.",
""
],
[
"Kniehl",
"B. A.",
""
],
[
"Steinhauser",
"M.",
""
]
] |
In this paper we compute the three-loop corrections to the $\beta$ function in a momentum subtraction (MOM) scheme with a massive quark. The calculation is performed in the background field formalism applying asymptotic expansions for small and large momenta. Special emphasis is devoted to the relation between the coupling constant in the MOM and $\overline{\rm{MS}}$ schemes as well as their ability to describe the phenomenon of decoupling. It is demonstrated by an explicit comparison that the $\overline{\rm{MS}}$ scheme can be consistently used to relate the values of the MOM-scheme strong-coupling constant in the energy regions higher and lower than the massive-quark production threshold. This procedure obviates the necessity to know the full mass dependence of the MOM $\beta$ function and clearly demonstrates the equivalence of both schemes for the description of physics outside the threshold region.
|
1209.0297
|
Konstantin Matchev
|
Stefan Ask, Neil D. Christensen, Claude Duhr, Christophe Grojean,
Stefan Hoeche, Konstantin Matchev, Olivier Mattelaer, Stephen Mrenna, Andreas
Papaefstathiou, Myeonghun Park, Maxim Perelstein, and Peter Skands
|
From Lagrangians to Events: Computer Tutorial at the MC4BSM-2012
Workshop
|
58 pages, 1 figure
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This is a written account of the computer tutorial offered at the Sixth
MC4BSM workshop at Cornell University, March 22-24, 2012. The tools covered
during the tutorial include: FeynRules, LanHEP, MadGraph, CalcHEP, Pythia 8,
Herwig++, and Sherpa. In the tutorial, we specify a simple extension of the
Standard Model, at the level of a Lagrangian. The software tools are then used
to automatically generate a set of Feynman rules, compute the invariant matrix
element for a sample process, and generate both parton-level and fully
hadronized/showered Monte Carlo event samples. The tutorial is designed to be
self-paced, and detailed instructions for all steps are included in this
write-up. Installation instructions for each tool on a variety of popular
platforms are also provided.
|
[
{
"created": "Mon, 3 Sep 2012 10:34:58 GMT",
"version": "v1"
}
] |
2012-09-04
|
[
[
"Ask",
"Stefan",
""
],
[
"Christensen",
"Neil D.",
""
],
[
"Duhr",
"Claude",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Hoeche",
"Stefan",
""
],
[
"Matchev",
"Konstantin",
""
],
[
"Mattelaer",
"Olivier",
""
],
[
"Mrenna",
"Stephen",
""
],
[
"Papaefstathiou",
"Andreas",
""
],
[
"Park",
"Myeonghun",
""
],
[
"Perelstein",
"Maxim",
""
],
[
"Skands",
"Peter",
""
]
] |
This is a written account of the computer tutorial offered at the Sixth MC4BSM workshop at Cornell University, March 22-24, 2012. The tools covered during the tutorial include: FeynRules, LanHEP, MadGraph, CalcHEP, Pythia 8, Herwig++, and Sherpa. In the tutorial, we specify a simple extension of the Standard Model, at the level of a Lagrangian. The software tools are then used to automatically generate a set of Feynman rules, compute the invariant matrix element for a sample process, and generate both parton-level and fully hadronized/showered Monte Carlo event samples. The tutorial is designed to be self-paced, and detailed instructions for all steps are included in this write-up. Installation instructions for each tool on a variety of popular platforms are also provided.
|
1902.00886
|
Jorge L\'opez
|
William K Brooks and Jorge L\'opez
|
Propagation of QCD Color through Strongly Interacting Systems
|
4 pages, 3 figures; proceedings for the Eighth International
Conference on Quarks and Nuclear Physics (QNP2018), Tsukuba, Japan.
https://www-conf.kek.jp/qnp2018/
| null |
10.7566/JPSCP.26.024008
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The propagation of QCD color through atomic nuclei is studied via a new
analysis using a geometric model of semi-inclusive deep inelastic scattering.
The experimental data were previously published by the HERMES Collaboration and
consisted of the multiplicity ratio observable (2007) and the transverse
momentum broadening observable (2010). We perform a simultaneous fit of these
two observables to estimate (1) the color lifetime of the quark, (2) quark
energy loss, (3) the $\hat{q}$ transport coefficient, and (4) the cross section
for hadronic interaction with the medium. We present preliminary results for
this fit.
|
[
{
"created": "Sun, 3 Feb 2019 12:20:38 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2019 02:24:01 GMT",
"version": "v2"
}
] |
2020-01-08
|
[
[
"Brooks",
"William K",
""
],
[
"López",
"Jorge",
""
]
] |
The propagation of QCD color through atomic nuclei is studied via a new analysis using a geometric model of semi-inclusive deep inelastic scattering. The experimental data were previously published by the HERMES Collaboration and consisted of the multiplicity ratio observable (2007) and the transverse momentum broadening observable (2010). We perform a simultaneous fit of these two observables to estimate (1) the color lifetime of the quark, (2) quark energy loss, (3) the $\hat{q}$ transport coefficient, and (4) the cross section for hadronic interaction with the medium. We present preliminary results for this fit.
|
hep-ph/0206289
|
Igor Shovkovy
|
V. P. Gusynin, V. A. Miransky and I. A. Shovkovy
|
Comment on ``Electron Mass Operator in a Strong Magnetic Field and
Dynamical Chiral Symmetry Breaking"
|
2 pages, REVTeX
|
Phys.Rev.Lett. 90 (2003) 089101
|
10.1103/PhysRevLett.90.089101
| null |
hep-ph
| null |
This is a comment on the paper ``Electron Mass Operator in a Strong Magnetic
Field and Dynamical Chiral Symmetry Breaking" by A. V. Kuznetsov and N. V.
Mikheev [Phys. Rev. Lett. 89 (2002) 011601]. We show that the main conclusions
of the paper are incorrect.
|
[
{
"created": "Thu, 27 Jun 2002 17:41:06 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Gusynin",
"V. P.",
""
],
[
"Miransky",
"V. A.",
""
],
[
"Shovkovy",
"I. A.",
""
]
] |
This is a comment on the paper ``Electron Mass Operator in a Strong Magnetic Field and Dynamical Chiral Symmetry Breaking" by A. V. Kuznetsov and N. V. Mikheev [Phys. Rev. Lett. 89 (2002) 011601]. We show that the main conclusions of the paper are incorrect.
|
1201.4741
|
Ali Alavi
|
S. A. Alavi, A. Abbasnezhad
|
Can Gravity Distinguish between Dirac and Majorana Neutrinos?
|
23 pages, 18 diagrams, 3 Figures, Replaced with the version published
in Gravitation and Cosmology
|
Gravitation and Cosmology July 2016, Volume 22, Issue 3, pp
288-298
|
10.1134/S0202289316030038
| null |
hep-ph astro-ph.HE gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The interaction of neutrinos with gravitational fields in the weak field
regime at one loop to the leading order has been studied by Menon and
Thalappilil. They deduced some theoretical differences between the Majorana and
Dirac neutrinos. Then they proved that, in spite of these theoretical
differences, as far as experiments are concerned, they would be virtually
indistinguishable. We study the interaction of neutrinos with weak
gravitational fields to the second order (at two loops). We show that there
appear new neutrino gravitational form factors which were absent in the
first-order calculations, so from a theoretical point of view there are more
differences between the two kinds of neutrinos than in the first order, but we
show that likewise they are indistinguishable experimentally.
|
[
{
"created": "Mon, 23 Jan 2012 15:24:46 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jun 2015 10:06:03 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Aug 2016 06:47:49 GMT",
"version": "v3"
}
] |
2016-08-16
|
[
[
"Alavi",
"S. A.",
""
],
[
"Abbasnezhad",
"A.",
""
]
] |
The interaction of neutrinos with gravitational fields in the weak field regime at one loop to the leading order has been studied by Menon and Thalappilil. They deduced some theoretical differences between the Majorana and Dirac neutrinos. Then they proved that, in spite of these theoretical differences, as far as experiments are concerned, they would be virtually indistinguishable. We study the interaction of neutrinos with weak gravitational fields to the second order (at two loops). We show that there appear new neutrino gravitational form factors which were absent in the first-order calculations, so from a theoretical point of view there are more differences between the two kinds of neutrinos than in the first order, but we show that likewise they are indistinguishable experimentally.
|
2209.07906
|
Artur E. Semushin
|
Artur E. Semushin, Evgeny Yu. Soldatov
|
Study of corrections for anomalous coupling limits due to the possible
background BSM contributions
|
13 pages, 4 figures, 4 tables. Published in Symmetry
|
Symmetry 14 (2022) 10,2082
|
10.3390/sym14102082
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The search of the anomalous couplings is one of the possible ways to find any
deviation from the Standard Model. The effective field theory is used to
parameterize the anomalous couplings in the Lagrangian with the operators of
higher dimensions, constructed from the SM fields. In the classical way, the
limits on the Wilson coefficients of these operators are set based on beyond
the Standard Model contributions induced for signal process, whereas the ones
induced for background processes are assumed to be negligible. This article
provides a study of the corrections to the limits on Wilson coefficients by
accounting beyond the Standard Model contributions induced for background
processes. The studies of $Z(\nu\bar{\nu})\gamma jj$ and $W(\ell\nu)\gamma jj$
productions in $pp$ collisions with $\sqrt{s}=13$ TeV and conditions of the
ATLAS experiment at the LHC are used as example. Cases of collected during Run
II and expected from Run III integrated luminosities of 139 fb$^{-1}$ and 300
fb$^{-1}$ are considered. The expected 95% CL limits on coefficients
$f_\text{T0}/\Lambda^4$, $f_\text{T5}/\Lambda^4$, $f_\text{M0}/\Lambda^4$ and
$f_\text{M2}/\Lambda^4$ are obtained both in classical way and in the way,
where the corrections from background anomalous contributions are applied.
Corrected one-dimensional limits from $Z(\nu\bar{\nu})\gamma jj$ and
$W(\ell\nu)\gamma jj$ productions are up to 9.1% and 4.4% (depending on
operator) tighter than the classical ones respectively. Corrected combined
limits are up to 3.0% (depending on operator) tighter than the classical ones.
Corrections to two-dimensional limits are also obtained, corrected contours are
more stringent, than the classical ones, and the maximal improvement is of
17.2%.
|
[
{
"created": "Fri, 16 Sep 2022 13:07:46 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2022 07:58:27 GMT",
"version": "v2"
}
] |
2022-11-24
|
[
[
"Semushin",
"Artur E.",
""
],
[
"Soldatov",
"Evgeny Yu.",
""
]
] |
The search of the anomalous couplings is one of the possible ways to find any deviation from the Standard Model. The effective field theory is used to parameterize the anomalous couplings in the Lagrangian with the operators of higher dimensions, constructed from the SM fields. In the classical way, the limits on the Wilson coefficients of these operators are set based on beyond the Standard Model contributions induced for signal process, whereas the ones induced for background processes are assumed to be negligible. This article provides a study of the corrections to the limits on Wilson coefficients by accounting beyond the Standard Model contributions induced for background processes. The studies of $Z(\nu\bar{\nu})\gamma jj$ and $W(\ell\nu)\gamma jj$ productions in $pp$ collisions with $\sqrt{s}=13$ TeV and conditions of the ATLAS experiment at the LHC are used as example. Cases of collected during Run II and expected from Run III integrated luminosities of 139 fb$^{-1}$ and 300 fb$^{-1}$ are considered. The expected 95% CL limits on coefficients $f_\text{T0}/\Lambda^4$, $f_\text{T5}/\Lambda^4$, $f_\text{M0}/\Lambda^4$ and $f_\text{M2}/\Lambda^4$ are obtained both in classical way and in the way, where the corrections from background anomalous contributions are applied. Corrected one-dimensional limits from $Z(\nu\bar{\nu})\gamma jj$ and $W(\ell\nu)\gamma jj$ productions are up to 9.1% and 4.4% (depending on operator) tighter than the classical ones respectively. Corrected combined limits are up to 3.0% (depending on operator) tighter than the classical ones. Corrections to two-dimensional limits are also obtained, corrected contours are more stringent, than the classical ones, and the maximal improvement is of 17.2%.
|
1712.02955
|
Xian-Qiao Yu
|
Feng Bo Duan, Xian-Qiao Yu
|
Study of $B_{c} \rightarrow \psi(2S) K$, $\eta_{c}(2S)K$, $\psi(3770)K$
decays with perturbative QCD approach
|
12pages, 2 figures
|
Phys. Rev. D 97, 096008 (2018)
|
10.1103/PhysRevD.97.096008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the $B_{c}$$\rightarrow$$\psi(2S)$K, $\eta_{c}(2S)$K, $\psi(3770)$K
decays with perturbative QCD approach (pQCD) based on $k_T$ factorization. The
new orbitally excited charmonium distribution amplitudes $\psi(1^{3}D_{1})$
based on the Schr\"{o}dinger wave function of the $n=1$, $l=2$ state for the
harmonic-oscillator potential are employed. By using the corresponding
distribution amplitudes, we calculate the branching ratio of
$B_{c}$$\rightarrow$$\psi(2S)$K, $\eta_{c}(2S)$K, $\psi(3770)$K decays and the
form factors $A_{0,1,2}$ and $V$ for the transition
$B_{c}$$\rightarrow$$\psi(1^{3}D_{1})$. We obtain the branching ratio of both
$B_{c}$$\rightarrow$$\psi(2S)$K and $B_{c}$$\rightarrow$$\eta_{c}(2S)$K are at
the order of $10^{-5}$. The effects of two sets of the S-D mixing angle
$\theta=-12^{\circ}$ and $\theta=27^{\circ}$ for the decay
$B_{c}$$\rightarrow$$\psi(3770)$K are studied firstly in this paper. Our
calculations show that the branching ratio of the decay
$B_{c}$$\rightarrow$$\psi(3770)$K can be raised from the order of $10^{-6}$ to
the order of $10^{-5}$ at the mixing angle $\theta=-12^{\circ}$, which can be
tested by the running LHC-b experiments.
|
[
{
"created": "Fri, 8 Dec 2017 06:21:45 GMT",
"version": "v1"
},
{
"created": "Sat, 19 May 2018 03:48:22 GMT",
"version": "v2"
}
] |
2018-05-23
|
[
[
"Duan",
"Feng Bo",
""
],
[
"Yu",
"Xian-Qiao",
""
]
] |
We study the $B_{c}$$\rightarrow$$\psi(2S)$K, $\eta_{c}(2S)$K, $\psi(3770)$K decays with perturbative QCD approach (pQCD) based on $k_T$ factorization. The new orbitally excited charmonium distribution amplitudes $\psi(1^{3}D_{1})$ based on the Schr\"{o}dinger wave function of the $n=1$, $l=2$ state for the harmonic-oscillator potential are employed. By using the corresponding distribution amplitudes, we calculate the branching ratio of $B_{c}$$\rightarrow$$\psi(2S)$K, $\eta_{c}(2S)$K, $\psi(3770)$K decays and the form factors $A_{0,1,2}$ and $V$ for the transition $B_{c}$$\rightarrow$$\psi(1^{3}D_{1})$. We obtain the branching ratio of both $B_{c}$$\rightarrow$$\psi(2S)$K and $B_{c}$$\rightarrow$$\eta_{c}(2S)$K are at the order of $10^{-5}$. The effects of two sets of the S-D mixing angle $\theta=-12^{\circ}$ and $\theta=27^{\circ}$ for the decay $B_{c}$$\rightarrow$$\psi(3770)$K are studied firstly in this paper. Our calculations show that the branching ratio of the decay $B_{c}$$\rightarrow$$\psi(3770)$K can be raised from the order of $10^{-6}$ to the order of $10^{-5}$ at the mixing angle $\theta=-12^{\circ}$, which can be tested by the running LHC-b experiments.
|
2106.05331
|
Rene Poncelet
|
Michal Czakon, Alexander Mitov, Rene Poncelet
|
A first next-to-next-to-leading order study of three-jet production at
the LHC
|
5 pages, 6 figures, In the original publication, we have evaluated
the two-loop finite remainder function with an incorrect colour factor. The
updated version of the paper contains the corrected plots and correspondingly
updated statements in the text
|
Phys. Rev. Lett. 127, 152001 (2021)
|
10.1103/PhysRevLett.127.152001
|
Cavendish-HEP-21/09, P3H-21-043, TTK-21-20
|
hep-ph hep-ex hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
Multi-jet rates at hadron colliders provide a unique possibility for probing
Quantum Chromodynamics (QCD), the theory of strong interactions. By comparing
theory predictions with collider data, one can directly test perturbative QCD,
extract fundamental parameters like the strong coupling $\alpha_s$ and search
for physics beyond the Standard Model. In this work we calculate, for the first
time, the next-to-next-to-leading (NNLO) QCD corrections to typical three-jet
observables and to differential three-to-two jet ratios. We demonstrate that
the inclusion of the NNLO corrections significantly reduces the dependence of
those observables on the factorization and renormalization scales. Besides its
phenomenological value, this proof-of-principle computation represents a
milestone in perturbative QCD.
|
[
{
"created": "Wed, 9 Jun 2021 18:42:58 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 2022 18:36:42 GMT",
"version": "v2"
}
] |
2022-08-30
|
[
[
"Czakon",
"Michal",
""
],
[
"Mitov",
"Alexander",
""
],
[
"Poncelet",
"Rene",
""
]
] |
Multi-jet rates at hadron colliders provide a unique possibility for probing Quantum Chromodynamics (QCD), the theory of strong interactions. By comparing theory predictions with collider data, one can directly test perturbative QCD, extract fundamental parameters like the strong coupling $\alpha_s$ and search for physics beyond the Standard Model. In this work we calculate, for the first time, the next-to-next-to-leading (NNLO) QCD corrections to typical three-jet observables and to differential three-to-two jet ratios. We demonstrate that the inclusion of the NNLO corrections significantly reduces the dependence of those observables on the factorization and renormalization scales. Besides its phenomenological value, this proof-of-principle computation represents a milestone in perturbative QCD.
|
1903.09771
|
Madhurjya Lalung
|
M. Lalung, P. Phukan, J. K. Sarma
|
Small-x analysis on the effect of gluon recombinations inside hadrons in
light of the GLR-MQ-ZRS equation
|
24 pages, 7 figures, new references added, new text added in the
Introduction and the Results and Discussion section, Accepted for publication
in Nuclear Physics A
|
Nuclear Physics A 992, 121615 (2019)
|
10.1016/j.nuclphysa.2019.121615
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a study of the contribution of antishadowing effects on the gluon
distribution functions $G(x,Q^2)$ in light of the
Gribov-Levin-Ryskin-Mueller-Qiu, Zhu-Ruan-Shen (GLR-MQ-ZRS) nonlinear equation
at small-$x$, where $x$ is the momentum fraction or Bjorken variable and $Q^2$
is the four momentum transfer squared or photon virtuality. In this work, we
have solved the GLR-MQ-ZRS nonlinear equation using Regge like the behavior of
gluons in the kinematic range of $10^{-2}\leq x \leq 10^{-6}$ and $5\,GeV^2\,
\leq Q^2\leq 100\, GeV^2$ respectively. We have obtained the solution of
$G(x,Q^2)$ by considering two particular cases: (a) $\alpha_s$ fixed; and (b)
the leading order QCD dependency of $\alpha_{s}$ on $Q^2$. A comparative
analysis is also performed where we compare the gluon distribution function due
to inclusion of the antishadowing effect with that of the gluon distribution
without including the antishadowing effect. Our obtained results of $G(x,Q^2)$
are compared with NNPDF3.0, CT14 and PDF4LHC. We also compare our results with
the result obtained from the IMParton C++ package. Using the solutions of
$G(x,Q^2)$, we have also predicted $x$ and $Q^2$ evolution of the logarithmic
derivative of proton's $F_2$ structure function i.e. $dF_2 (x,Q^2)/d\ln Q^2$.
We incorporated both the leading order(LO) and next-to-leading order (NLO) QCD
contributions of the gluon-quark splitting kernels, in $dF_2 (x,Q^2)/d\ln Q^2$.
Our result of $dF_2 (x,Q^2)/d\ln Q^2$ agrees reasonably well with the
experimental data recorded by HERA's H1 detector.
|
[
{
"created": "Sat, 23 Mar 2019 06:45:17 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Aug 2019 05:13:26 GMT",
"version": "v2"
}
] |
2019-09-25
|
[
[
"Lalung",
"M.",
""
],
[
"Phukan",
"P.",
""
],
[
"Sarma",
"J. K.",
""
]
] |
We present a study of the contribution of antishadowing effects on the gluon distribution functions $G(x,Q^2)$ in light of the Gribov-Levin-Ryskin-Mueller-Qiu, Zhu-Ruan-Shen (GLR-MQ-ZRS) nonlinear equation at small-$x$, where $x$ is the momentum fraction or Bjorken variable and $Q^2$ is the four momentum transfer squared or photon virtuality. In this work, we have solved the GLR-MQ-ZRS nonlinear equation using Regge like the behavior of gluons in the kinematic range of $10^{-2}\leq x \leq 10^{-6}$ and $5\,GeV^2\, \leq Q^2\leq 100\, GeV^2$ respectively. We have obtained the solution of $G(x,Q^2)$ by considering two particular cases: (a) $\alpha_s$ fixed; and (b) the leading order QCD dependency of $\alpha_{s}$ on $Q^2$. A comparative analysis is also performed where we compare the gluon distribution function due to inclusion of the antishadowing effect with that of the gluon distribution without including the antishadowing effect. Our obtained results of $G(x,Q^2)$ are compared with NNPDF3.0, CT14 and PDF4LHC. We also compare our results with the result obtained from the IMParton C++ package. Using the solutions of $G(x,Q^2)$, we have also predicted $x$ and $Q^2$ evolution of the logarithmic derivative of proton's $F_2$ structure function i.e. $dF_2 (x,Q^2)/d\ln Q^2$. We incorporated both the leading order(LO) and next-to-leading order (NLO) QCD contributions of the gluon-quark splitting kernels, in $dF_2 (x,Q^2)/d\ln Q^2$. Our result of $dF_2 (x,Q^2)/d\ln Q^2$ agrees reasonably well with the experimental data recorded by HERA's H1 detector.
|
2204.01655
|
Fabio L. Braghin
|
Igor de M. Froldi, Fabio L. Braghin
|
Classical Yang Mills equations with sources: consequences of specific
scalar potentials
|
33 pages, 29 figures, improved sentences, few references included and
some misprints corrected
|
Ann. of Phys. 444 (2022) 169026
|
10.1016/j.aop.2022.169026
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Some well known gauge scalar potential very often considered or used in the
literature are investigated by means of the classical Yang Mills equations for
the $SU(2)$ subgroups of $N_c=3$. By fixing a particular shape for the scalar
potential, the resulting vector potentials and the corresponding color-charges
sources are found. By adopting the spherical coordinate system, it is shown
that spherically symmetric solutions, only dependent on the radial coordinate,
are only possible for the Abelian limit, otherwise, there must have
angle-dependent component(s). The following solutions for the scalar potential
are investigated: the Coulomb potential and a non-spherically symmetric
generalization, a linear potential $A_0 (\vec{r}) \sim (\kappa r)$, a
Yukawa-type potential $A_0 (\vec{r}) \sim (C e^{-r/r_0}/r)$ and finite spatial
regions in which the scalar potential assumes constant values. The
corresponding chromo-electric and chromo-magnetic fields, as well as the
color-charge densities, are found to have strong deviations from the spherical
symmetric configurations. We speculate these types of non-spherically symmetric
configurations may contribute (or favor) for the (anisotropic) confinement
mechanism since they should favor color charge-anti-charge (or
three-color-charge) bound states that are intrinsically non spherically
symmetric with (asymmetric) confinement of fluxes. Specific conditions and
relations between the parameters of the solutions are also presented.
|
[
{
"created": "Mon, 4 Apr 2022 17:03:58 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2022 17:37:03 GMT",
"version": "v2"
}
] |
2022-08-02
|
[
[
"Froldi",
"Igor de M.",
""
],
[
"Braghin",
"Fabio L.",
""
]
] |
Some well known gauge scalar potential very often considered or used in the literature are investigated by means of the classical Yang Mills equations for the $SU(2)$ subgroups of $N_c=3$. By fixing a particular shape for the scalar potential, the resulting vector potentials and the corresponding color-charges sources are found. By adopting the spherical coordinate system, it is shown that spherically symmetric solutions, only dependent on the radial coordinate, are only possible for the Abelian limit, otherwise, there must have angle-dependent component(s). The following solutions for the scalar potential are investigated: the Coulomb potential and a non-spherically symmetric generalization, a linear potential $A_0 (\vec{r}) \sim (\kappa r)$, a Yukawa-type potential $A_0 (\vec{r}) \sim (C e^{-r/r_0}/r)$ and finite spatial regions in which the scalar potential assumes constant values. The corresponding chromo-electric and chromo-magnetic fields, as well as the color-charge densities, are found to have strong deviations from the spherical symmetric configurations. We speculate these types of non-spherically symmetric configurations may contribute (or favor) for the (anisotropic) confinement mechanism since they should favor color charge-anti-charge (or three-color-charge) bound states that are intrinsically non spherically symmetric with (asymmetric) confinement of fluxes. Specific conditions and relations between the parameters of the solutions are also presented.
|
hep-ph/9607475
|
Dr Philip "R." Page
|
Philip R. Page
|
Two Photon Couplings of Hybrid Mesons
|
15 pages, LaTeX, 2 postscript figures, uses epsf. Rewritten for
clarification
|
Nucl.Phys. B495 (1997) 268-282
|
10.1016/S0550-3213(97)00191-0
| null |
hep-ph
| null |
A new formalism is developed for the two photon production of hybrid mesons
via intermediate hadronic decays. In an adiabatic and non-relativistic context
with spin 1 pair creation we obtain the first absolute estimates of unmixed
hybrid production strengths to be small (0.03 - 3 eV) in relation to
experimental meson widths (0.1 - 5 keV). Within this context, two photon
experiments at Babar, Cleo II, LEP2 and LHC therefore strongly discriminate
between hybrid and conventional meson wave function components, filtering out
conventional meson components. Decay widths of unmixed hybrids vanish.
Conventional meson two photon widths are roughly in agreement with experiment.
|
[
{
"created": "Wed, 31 Jul 1996 11:23:05 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 1997 22:09:55 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Page",
"Philip R.",
""
]
] |
A new formalism is developed for the two photon production of hybrid mesons via intermediate hadronic decays. In an adiabatic and non-relativistic context with spin 1 pair creation we obtain the first absolute estimates of unmixed hybrid production strengths to be small (0.03 - 3 eV) in relation to experimental meson widths (0.1 - 5 keV). Within this context, two photon experiments at Babar, Cleo II, LEP2 and LHC therefore strongly discriminate between hybrid and conventional meson wave function components, filtering out conventional meson components. Decay widths of unmixed hybrids vanish. Conventional meson two photon widths are roughly in agreement with experiment.
|
1011.5518
|
Tong Li
|
M. Adeel Ajaib, Tong Li, Qaisar Shafi, Kai Wang
|
NLSP Gluino Search at the Tevatron and early LHC
|
14 pages, 4 figures and 3 tables, minor modifications made and
accepted for publication in JHEP
|
JHEP 1101:028,2011
|
10.1007/JHEP01(2011)028
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the collider phenomenology of gluino-bino co-annihilation
scenario both at the Tevatron and 7 TeV LHC. This scenario can be realized, for
example, in a class of realistic supersymmetric models with non-universal
gaugino masses and t-b-\tau Yukawa unification. The NLSP gluino and LSP bino
should be nearly degenerate in mass, so that the typical gluino search channels
involving leptons or hard jets are not available. Consequently, the gluino can
be lighter than various bounds on its mass from direct searches. We propose a
new search for NLSP gluino involving multi-b final states, arising from the
three-body decay \tilde{g}-> b\bar{b}\tilde{\chi}_1^0. We identify two
realistic models with gluino mass of around 300 GeV for which the three-body
decay is dominant, and show that a 4.5 \sigma observation sensitivity can be
achieved at the Tevatron with an integrated luminosity of 10 fb^{-1}. For the 7
TeV LHC with 50 pb^{-1} of integrated luminosity, the number of signal events
for the two models is O(10), to be compared with negligible SM background
event.
|
[
{
"created": "Wed, 24 Nov 2010 21:44:54 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Dec 2010 21:53:53 GMT",
"version": "v2"
}
] |
2011-01-27
|
[
[
"Ajaib",
"M. Adeel",
""
],
[
"Li",
"Tong",
""
],
[
"Shafi",
"Qaisar",
""
],
[
"Wang",
"Kai",
""
]
] |
We investigate the collider phenomenology of gluino-bino co-annihilation scenario both at the Tevatron and 7 TeV LHC. This scenario can be realized, for example, in a class of realistic supersymmetric models with non-universal gaugino masses and t-b-\tau Yukawa unification. The NLSP gluino and LSP bino should be nearly degenerate in mass, so that the typical gluino search channels involving leptons or hard jets are not available. Consequently, the gluino can be lighter than various bounds on its mass from direct searches. We propose a new search for NLSP gluino involving multi-b final states, arising from the three-body decay \tilde{g}-> b\bar{b}\tilde{\chi}_1^0. We identify two realistic models with gluino mass of around 300 GeV for which the three-body decay is dominant, and show that a 4.5 \sigma observation sensitivity can be achieved at the Tevatron with an integrated luminosity of 10 fb^{-1}. For the 7 TeV LHC with 50 pb^{-1} of integrated luminosity, the number of signal events for the two models is O(10), to be compared with negligible SM background event.
|
hep-ph/0303080
|
Andreas Ringwald
|
Z. Fodor, S. D. Katz, A. Ringwald, H. Tu
|
Electroweak instantons as a solution to the ultrahigh energy cosmic ray
puzzle
|
14 pages, 7 figures
|
Phys.Lett. B561 (2003) 191-201
|
10.1016/S0370-2693(03)00487-8
|
WUB 03-03, ITP-BUDAPEST 593, DESY 03-022
|
hep-ph astro-ph
| null |
We propose a scenario in which a simple power-like primary spectrum for
protons with sources at cosmological distances leads to a quantitative
description of all the details of the observed cosmic ray spectrum for energies
from 10^{17} eV to 10^{21} eV. As usual, the ultrahigh energy protons with
energies above E_{GZK} ~ 4 x 10^{19} eV loose a large fraction of their
energies by the photoproduction of pions on the cosmic microwave background,
which finally decay mainly into neutrinos. In our scenario, these so-called
cosmogenic neutrinos interact with nucleons in the atmosphere through Standard
Model electroweak instanton-induced processes and produce air showers which are
hardly distinguishable from ordinary hadron-initiated air showers. In this way,
they give rise to a second contribution to the observed cosmic ray spectrum --
in addition to the one from above mentioned protons -- which reaches beyond
E_{GZK}. Since the whole observed spectrum is uniquely determined by a single
primary injection spectrum, no fine tuning is needed to fix the ratio of the
spectra below and above E_{GZK}. The statistical analysis shows an excellent
goodness of this scenario. Possible tests of it range from observations at
cosmic ray facilities and neutrino telescopes to searches for QCD
instanton-induced processes at HERA.
|
[
{
"created": "Mon, 10 Mar 2003 16:38:56 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Fodor",
"Z.",
""
],
[
"Katz",
"S. D.",
""
],
[
"Ringwald",
"A.",
""
],
[
"Tu",
"H.",
""
]
] |
We propose a scenario in which a simple power-like primary spectrum for protons with sources at cosmological distances leads to a quantitative description of all the details of the observed cosmic ray spectrum for energies from 10^{17} eV to 10^{21} eV. As usual, the ultrahigh energy protons with energies above E_{GZK} ~ 4 x 10^{19} eV loose a large fraction of their energies by the photoproduction of pions on the cosmic microwave background, which finally decay mainly into neutrinos. In our scenario, these so-called cosmogenic neutrinos interact with nucleons in the atmosphere through Standard Model electroweak instanton-induced processes and produce air showers which are hardly distinguishable from ordinary hadron-initiated air showers. In this way, they give rise to a second contribution to the observed cosmic ray spectrum -- in addition to the one from above mentioned protons -- which reaches beyond E_{GZK}. Since the whole observed spectrum is uniquely determined by a single primary injection spectrum, no fine tuning is needed to fix the ratio of the spectra below and above E_{GZK}. The statistical analysis shows an excellent goodness of this scenario. Possible tests of it range from observations at cosmic ray facilities and neutrino telescopes to searches for QCD instanton-induced processes at HERA.
|
0903.4677
|
David G. Cerdeno
|
David G. Cerdeno, Osamu Seto
|
Right-handed sneutrino dark matter in the NMSSM
|
LaTeX, 59 pages, 20 figures
|
JCAP 0908:032,2009
|
10.1088/1475-7516/2009/08/032
|
FTUAM 09/5, IFT-UAM/CSIC-09-17, FTPI-MINN-09-14, UMN-TH-2742/09
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the properties of the right-handed sneutrino and its viability as a
WIMP dark matter candidate in an extended version of the NMSSM in which a
right-handed neutrino superfield is included with a coupling to the singlet
Higgs in order to provide non-vanishing Majorana neutrino masses. We perform a
systematic study of the parameter space, including LEP constraints and
experimental bounds on low-energy observables. We investigate the conditions
under which the right-handed sneutrino has the correct relic abundance and the
dominant annihilation channels. Next we calculate the theoretical predictions
for the sneutrino-proton elastic scattering cross section and compare it with
present and future experimental sensitivities. We find that sneutrinos with a
mass in the range of 5-200 GeV can reproduce the observed dark matter relic
density without being excluded by direct dark matter searches and for natural
values of the input parameters. Interestingly, the predicted scattering cross
section is generally within the reach of future experiments. Finally, we
comment on the possible implications for collider physics.
|
[
{
"created": "Thu, 26 Mar 2009 19:36:17 GMT",
"version": "v1"
}
] |
2009-09-28
|
[
[
"Cerdeno",
"David G.",
""
],
[
"Seto",
"Osamu",
""
]
] |
We study the properties of the right-handed sneutrino and its viability as a WIMP dark matter candidate in an extended version of the NMSSM in which a right-handed neutrino superfield is included with a coupling to the singlet Higgs in order to provide non-vanishing Majorana neutrino masses. We perform a systematic study of the parameter space, including LEP constraints and experimental bounds on low-energy observables. We investigate the conditions under which the right-handed sneutrino has the correct relic abundance and the dominant annihilation channels. Next we calculate the theoretical predictions for the sneutrino-proton elastic scattering cross section and compare it with present and future experimental sensitivities. We find that sneutrinos with a mass in the range of 5-200 GeV can reproduce the observed dark matter relic density without being excluded by direct dark matter searches and for natural values of the input parameters. Interestingly, the predicted scattering cross section is generally within the reach of future experiments. Finally, we comment on the possible implications for collider physics.
|
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