id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9902349 | Victor Manuel Villanueva Sandoval | J. L Lucio, M. Napsuciale, M. D. Scadron and V. M. Villanueva | The omega to rho pi transition and omega to rho 3 pi decay | 12 pages, LaTeX, 3 eps figures, uses epsf.sty | null | null | IFUG HEP-9901 | hep-ph | null | We evaluate the omega to rho pi transition and the omega to 3 pi decay using
a Quark Level Linear Sigma Model ($QL\sigma M$). We obtain $g^{QL\sigma
M}_{\omega\rho\pi}= (10.33 - 14.75) GeV^{-1}$ to be compared with other model
dependent estimates averaging to $g_{\omega\rho\pi} = 16 GeV^{-1}$. We show
that in the $QL\sigma M$ a contact term is generated for the $\omega \to 3 \pi$
decay. Although the contact contribution by itself is small, the interference
effects turn out to be important.
| [
{
"created": "Mon, 15 Feb 1999 19:33:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lucio",
"J. L",
""
],
[
"Napsuciale",
"M.",
""
],
[
"Scadron",
"M. D.",
""
],
[
"Villanueva",
"V. M.",
""
]
] | We evaluate the omega to rho pi transition and the omega to 3 pi decay using a Quark Level Linear Sigma Model ($QL\sigma M$). We obtain $g^{QL\sigma M}_{\omega\rho\pi}= (10.33 - 14.75) GeV^{-1}$ to be compared with other model dependent estimates averaging to $g_{\omega\rho\pi} = 16 GeV^{-1}$. We show that in the $QL\sigma M$ a contact term is generated for the $\omega \to 3 \pi$ decay. Although the contact contribution by itself is small, the interference effects turn out to be important. |
hep-ph/0407278 | Yong Zhou | Yong Zhou, Cai-Dian L\"u | Singularities of Feynman amplitude and cutting rules | null | null | null | null | hep-ph | null | The contents of this manuscript has been moved to hep-ph/0412204.
| [
{
"created": "Fri, 23 Jul 2004 10:02:50 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 2004 14:28:18 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Aug 2004 09:08:57 GMT",
"version": "v3"
},
{
"created": "Fri, 17 Dec 2004 02:22:30 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Zhou",
"Yong",
""
],
[
"Lü",
"Cai-Dian",
""
]
] | The contents of this manuscript has been moved to hep-ph/0412204. |
1404.0028 | Narayan Rana | Taushif Ahmed, Maguni Mahakhud, Prakash Mathews, Narayan Rana and V.
Ravindran | Two-Loop QCD Correction to massive spin-2 resonance $\rightarrow$ 3
gluons | null | null | 10.1007/JHEP05(2014)107 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the ${\cal O}(\alpha_s^3)$ virtual QCD corrections to the process
$h \rightarrow g+g+g$ due to interference of born and two-loop amplitudes,
where $h$ is a massive spin-2 particle and $g$ is the gluon. We assume that the
SM fields couple to $h$ through the SM energy momentum tensor. Our result
constitutes one of the ingredients to full NNLO QCD contribution to production
of a massive spin-2 particle along with a jet in the scattering process at the
LHC. In particular, this massive spin-2 could be a KK mode of a ADD graviton in
large extra dimensional model or a RS KK mode in warped extra dimensional model
or a generic massive spin-2. In addition, it provides an opportunity to study
the ultraviolet and infrared structures of QCD amplitudes involving tensorial
coupling resulting from energy momentum operator. Using dimensional
regularization, we find that infrared poles of this amplitude are in agreement
with the proposal by Catani confirming the factorization property of QCD
amplitudes with tensorial insertion.
| [
{
"created": "Mon, 31 Mar 2014 20:21:51 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Ahmed",
"Taushif",
""
],
[
"Mahakhud",
"Maguni",
""
],
[
"Mathews",
"Prakash",
""
],
[
"Rana",
"Narayan",
""
],
[
"Ravindran",
"V.",
""
]
] | We present the ${\cal O}(\alpha_s^3)$ virtual QCD corrections to the process $h \rightarrow g+g+g$ due to interference of born and two-loop amplitudes, where $h$ is a massive spin-2 particle and $g$ is the gluon. We assume that the SM fields couple to $h$ through the SM energy momentum tensor. Our result constitutes one of the ingredients to full NNLO QCD contribution to production of a massive spin-2 particle along with a jet in the scattering process at the LHC. In particular, this massive spin-2 could be a KK mode of a ADD graviton in large extra dimensional model or a RS KK mode in warped extra dimensional model or a generic massive spin-2. In addition, it provides an opportunity to study the ultraviolet and infrared structures of QCD amplitudes involving tensorial coupling resulting from energy momentum operator. Using dimensional regularization, we find that infrared poles of this amplitude are in agreement with the proposal by Catani confirming the factorization property of QCD amplitudes with tensorial insertion. |
1809.00131 | Ian G. Moss | Ian G. Moss and Ruth Gregory | Higgs Cosmology and Dark Matter | 5 pages, 4 figures. Talk presented at 2nd World Summit: Exploring the
Dark Side of the Universe, June 2018, University of Antilles, Guadeloupe | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs vacuum stability has important consequences for cosmology. In
particular, we argue that if the Higgs vacuum is metastable, then the dark
matter cannot contain a single black hole of mass less than $10^{15}{\rm g}$ in
our entire past light cone. In addition to being the destroyer microscopic
black holes, it may be possible that Higgs vacuum decay is a source of
primordial black holes during inflation.
| [
{
"created": "Sat, 1 Sep 2018 08:03:51 GMT",
"version": "v1"
}
] | 2018-09-05 | [
[
"Moss",
"Ian G.",
""
],
[
"Gregory",
"Ruth",
""
]
] | Higgs vacuum stability has important consequences for cosmology. In particular, we argue that if the Higgs vacuum is metastable, then the dark matter cannot contain a single black hole of mass less than $10^{15}{\rm g}$ in our entire past light cone. In addition to being the destroyer microscopic black holes, it may be possible that Higgs vacuum decay is a source of primordial black holes during inflation. |
hep-ph/9506389 | Jun Liu | J\`un L\'iu, Nimai C. Mukhopadhyay and Lisheng Zhang | Nucleon to Delta Weak Excitation Amplitudes in the Non-relativistic
Quark Model | \documentstyle[aps]{revtex}, 21pages; 11 postscript figures. Accepted
for publication by Phys. Rev. C | Phys.Rev.C52:1630-1647,1995 | 10.1103/PhysRevC.52.1630 | null | hep-ph nucl-th | null | We investigate the nucleon to Delta(1232) vector and axial vector amplitudes
in the non-relativistic quark model of the Isgur-Karl variety. A particular
interest is to investigate the SU(6) symmetry breaking, due to color hyperfine
interaction. We compare the theoretical estimates to recent experimental
investigation of the Adler amplitudes by neutrino scattering.
| [
{
"created": "Thu, 22 Jun 1995 06:29:07 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Líu",
"Jùn",
""
],
[
"Mukhopadhyay",
"Nimai C.",
""
],
[
"Zhang",
"Lisheng",
""
]
] | We investigate the nucleon to Delta(1232) vector and axial vector amplitudes in the non-relativistic quark model of the Isgur-Karl variety. A particular interest is to investigate the SU(6) symmetry breaking, due to color hyperfine interaction. We compare the theoretical estimates to recent experimental investigation of the Adler amplitudes by neutrino scattering. |
hep-ph/9601298 | Sean Fleming | James Amundson (MSU), Sean Fleming (U. Toronto), and Ivan Maksymyk
(TRIUMF) | Photoproduction of J/$\psi$ in the forward region | Version to appear in Phys. Rev. Substantial changes | Phys.Rev. D56 (1997) 5844-5850 | 10.1103/PhysRevD.56.5844 | UTTG-10-95, MADPH-95-914 | hep-ph | null | We study the phenomenology of fixed-target elastic $J/\psi$ photoproduction
in the NRQCD factorization formalism. Our the goal is to test an essential
feature of this formalism --- the color-octet mechanism. We obtain an
order-of-magnitude estimate for a certain linear combination of NRQCD
color-octet matrix elements. Our estimate is consistent with other empirical
determinations and with the $v$-scaling rules of NRQCD.
| [
{
"created": "Fri, 19 Jan 1996 06:15:54 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Oct 1997 16:23:48 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Amundson",
"James",
"",
"MSU"
],
[
"Fleming",
"Sean",
"",
"U. Toronto"
],
[
"Maksymyk",
"Ivan",
"",
"TRIUMF"
]
] | We study the phenomenology of fixed-target elastic $J/\psi$ photoproduction in the NRQCD factorization formalism. Our the goal is to test an essential feature of this formalism --- the color-octet mechanism. We obtain an order-of-magnitude estimate for a certain linear combination of NRQCD color-octet matrix elements. Our estimate is consistent with other empirical determinations and with the $v$-scaling rules of NRQCD. |
1012.5466 | Ryosuke Sato | Masahiro Ibe, Ryosuke Sato, Tsutomu T. Yanagida, Kazuya Yonekura | Gravitino Dark Matter and Light Gluino in an R-invariant Low Scale Gauge
Mediation | 29 pages, 12 figures; v2 reference and explanation added | JHEP 1104:077,2011 | 10.1007/JHEP04(2011)077 | IPMU-10-0222, UT-10-22 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the simplest class of the R-invariant gauge mediation model with
the gravitino mass in the one to ten keV range. We show that the entropy
production from the supersymmetry breaking sector makes the gravitino into a
warm dark matter candidate. We also discuss that the gluino mass can be lighter
than the wino mass even when the messenger sector satisfies the GUT relations
at the GUT scale.
| [
{
"created": "Sat, 25 Dec 2010 12:12:47 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2011 10:11:21 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Ibe",
"Masahiro",
""
],
[
"Sato",
"Ryosuke",
""
],
[
"Yanagida",
"Tsutomu T.",
""
],
[
"Yonekura",
"Kazuya",
""
]
] | We consider the simplest class of the R-invariant gauge mediation model with the gravitino mass in the one to ten keV range. We show that the entropy production from the supersymmetry breaking sector makes the gravitino into a warm dark matter candidate. We also discuss that the gluino mass can be lighter than the wino mass even when the messenger sector satisfies the GUT relations at the GUT scale. |
2306.11653 | Bartol Pavlovi\'c | Monojit Ghosh, Srubabati Goswami, Supriya Pan and Bartol Pavlovi\'c | Implications of the DLMA solution of $\theta_{12}$ for IceCube data
using different astrophysical sources | 10 pages, 6 figures, 3 tables. Version accepted for publication in
Universe | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the implications of the Dark Large Mixing Angle
(DLMA) solutions of $\theta_{12}$ in the context of the IceCube data. We study
the consequences in the measurement of the neutrino oscillation parameters
namely $\theta_{23}$ and $\delta_{\rm CP}$ in light of both Large Mixing Angle
(LMA) and DLMA solutions of $\theta_{12}$. We find that it will be impossible
for IceCube to determine the $\delta_{\rm CP}$ and the true nature of
$\theta_{12}$ i.e., LMA or DLMA at the same time. This is because of the
existence of an intrinsic degeneracy at the Hamiltonian level between these
parameters. Apart from that, we also identify a new degeneracy between
$\theta_{23}$ and two solutions of $\theta_{12}$ for a fixed value of
$\delta_{\rm CP}$. We perform a chi-square fit using three different
astrophysical sources, i.e., $\mu$ source, $\pi$ source, and $n$ source to find
that both $\mu$ source and $\pi$ source are allowed within $1 \sigma$ whereas
the $n$ source is excluded at $2 \sigma$. It is difficult to make any
conclusion regarding the measurement of $\theta_{23}$, $\delta_{\rm CP}$ for
$\mu$ source. However, The $\pi$ ($n$) source prefers higher (lower) octant of
$\theta_{23}$ for both LMA and DLMA solution of $\theta_{12}$. The best-fit
value of $\delta_{\rm CP}$ is around $180^\circ$ ($0^\circ/360^\circ$) for LMA
(DLMA) solution of $\theta_{12}$ whereas for DLMA (LMA) solution of
$\theta_{12}$, the best-fit value is around $0^\circ/360^\circ$ ($180^\circ$)
for $\pi$ ($n$) source. If we assume the current best-fit values of
$\theta_{23}$ and $\delta_{\rm CP}$ to be true, then the $\mu$ and $\pi$ source
prefer the LMA solution of $\theta_{12}$ whereas the $n$ source prefers the
DLMA solution of $\theta_{12}$.
| [
{
"created": "Tue, 20 Jun 2023 16:25:00 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2023 13:51:50 GMT",
"version": "v2"
}
] | 2023-08-24 | [
[
"Ghosh",
"Monojit",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Pan",
"Supriya",
""
],
[
"Pavlović",
"Bartol",
""
]
] | In this paper, we study the implications of the Dark Large Mixing Angle (DLMA) solutions of $\theta_{12}$ in the context of the IceCube data. We study the consequences in the measurement of the neutrino oscillation parameters namely $\theta_{23}$ and $\delta_{\rm CP}$ in light of both Large Mixing Angle (LMA) and DLMA solutions of $\theta_{12}$. We find that it will be impossible for IceCube to determine the $\delta_{\rm CP}$ and the true nature of $\theta_{12}$ i.e., LMA or DLMA at the same time. This is because of the existence of an intrinsic degeneracy at the Hamiltonian level between these parameters. Apart from that, we also identify a new degeneracy between $\theta_{23}$ and two solutions of $\theta_{12}$ for a fixed value of $\delta_{\rm CP}$. We perform a chi-square fit using three different astrophysical sources, i.e., $\mu$ source, $\pi$ source, and $n$ source to find that both $\mu$ source and $\pi$ source are allowed within $1 \sigma$ whereas the $n$ source is excluded at $2 \sigma$. It is difficult to make any conclusion regarding the measurement of $\theta_{23}$, $\delta_{\rm CP}$ for $\mu$ source. However, The $\pi$ ($n$) source prefers higher (lower) octant of $\theta_{23}$ for both LMA and DLMA solution of $\theta_{12}$. The best-fit value of $\delta_{\rm CP}$ is around $180^\circ$ ($0^\circ/360^\circ$) for LMA (DLMA) solution of $\theta_{12}$ whereas for DLMA (LMA) solution of $\theta_{12}$, the best-fit value is around $0^\circ/360^\circ$ ($180^\circ$) for $\pi$ ($n$) source. If we assume the current best-fit values of $\theta_{23}$ and $\delta_{\rm CP}$ to be true, then the $\mu$ and $\pi$ source prefer the LMA solution of $\theta_{12}$ whereas the $n$ source prefers the DLMA solution of $\theta_{12}$. |
hep-ph/9805342 | Anatoly Radyushkin | A.V. Radyushkin | Double distributions and evolution equations | 21 pages, Latex, 8 figures. To appear in Phys. Rev. D | Phys.Rev.D59:014030,1999 | 10.1103/PhysRevD.59.014030 | JLAB-THY-98-16 | hep-ph | null | Applications of perturbative QCD to deeply virtual Compton scattering and
hard exclusive meson electroproduction processes require a generalization of
usual parton distributions for the case when long-distance information is
accumulated in nonforward matrix elements < p'| O(0,z) | p > of quark and gluon
light-cone operators. In our previous papers we used two types of
nonperturbative functions parametrizing such matrix elements: double
distributions F(x,y;t) and nonforward distribution functions F_\zeta(X;t). Here
we discuss in more detail the double distributions (DD's) and evolution
equations which they satisfy. We propose simple models for F(x,y;t=0) DD's with
correct spectral and symmetry properties which also satisfy the reduction
relations connecting them to the usual parton densities f(x). In this way, we
obtain self-consistent models for the \zeta-dependence of nonforward
distributions. We show that, for small \zeta, one can easily obtain nonforward
distributions (in the X > \zeta region) from the parton densities: F_\zeta
(X;t=0) \approx f(X-\zeta/2).
| [
{
"created": "Fri, 15 May 1998 19:40:35 GMT",
"version": "v1"
},
{
"created": "Mon, 25 May 1998 13:08:28 GMT",
"version": "v2"
},
{
"created": "Thu, 28 May 1998 09:18:51 GMT",
"version": "v3"
},
{
"created": "Wed, 3 Jun 1998 15:11:43 GMT",
"version": "v4"
},
{
"cr... | 2014-11-17 | [
[
"Radyushkin",
"A. V.",
""
]
] | Applications of perturbative QCD to deeply virtual Compton scattering and hard exclusive meson electroproduction processes require a generalization of usual parton distributions for the case when long-distance information is accumulated in nonforward matrix elements < p'| O(0,z) | p > of quark and gluon light-cone operators. In our previous papers we used two types of nonperturbative functions parametrizing such matrix elements: double distributions F(x,y;t) and nonforward distribution functions F_\zeta(X;t). Here we discuss in more detail the double distributions (DD's) and evolution equations which they satisfy. We propose simple models for F(x,y;t=0) DD's with correct spectral and symmetry properties which also satisfy the reduction relations connecting them to the usual parton densities f(x). In this way, we obtain self-consistent models for the \zeta-dependence of nonforward distributions. We show that, for small \zeta, one can easily obtain nonforward distributions (in the X > \zeta region) from the parton densities: F_\zeta (X;t=0) \approx f(X-\zeta/2). |
1803.00945 | Ferruccio Feruglio | Claudia Cornella, Ferruccio Feruglio and Paride Paradisi | Low-energy Effects of Lepton Flavour Universality Violation | 24 pages, 2 figures | null | 10.1007/JHEP11(2018)012 | ZU-TH-09/18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The persisting anomalous data in semileptonic B-decays point towards New
Physics models exhibiting large sources of Lepton Flavour Universality
Violation. In this work we generalise previous studies by considering
frameworks which include an enlarged set of semileptonic four-fermion operators
invariant under the SM gauge group, with New Physics affecting mainly the third
generation. We derive the low-energy effective Lagrangian including the leading
electroweak corrections, mandatory to obtain reliable predictions. As a
particularly interesting case, we analyse the scenario where the dominant New
Physics effects are encoded in the Wilson coefficient C_9, as favoured by
global fit analyses of b -> s data. We find that also in this case the
stringent experimental bounds on Z-pole observables and tau decays challenge a
simultaneous explanation of charged and neutral-current non-standard data.
| [
{
"created": "Fri, 2 Mar 2018 16:45:50 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Cornella",
"Claudia",
""
],
[
"Feruglio",
"Ferruccio",
""
],
[
"Paradisi",
"Paride",
""
]
] | The persisting anomalous data in semileptonic B-decays point towards New Physics models exhibiting large sources of Lepton Flavour Universality Violation. In this work we generalise previous studies by considering frameworks which include an enlarged set of semileptonic four-fermion operators invariant under the SM gauge group, with New Physics affecting mainly the third generation. We derive the low-energy effective Lagrangian including the leading electroweak corrections, mandatory to obtain reliable predictions. As a particularly interesting case, we analyse the scenario where the dominant New Physics effects are encoded in the Wilson coefficient C_9, as favoured by global fit analyses of b -> s data. We find that also in this case the stringent experimental bounds on Z-pole observables and tau decays challenge a simultaneous explanation of charged and neutral-current non-standard data. |
1710.01515 | Abhishek Iyer M | A.Deandrea, A.M. Iyer | Vector-like quarks and heavy coloured bosons at the LHC | 13 Pages, 4 Figures | Phys. Rev. D 97, 055002 (2018) | 10.1103/PhysRevD.97.055002 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the production of heavy coloured scalars and vectors and their
relevance at LHC for the study of vector-like quarks ($T$). These coloured
states ($C$) are present in a large number of extensions of the standard model,
in particular in composite models and in extra dimensional models. Assuming
that these bosonic states are heavier than the vector-like quarks (VLQ), we
consider their production through the process $p~p\rightarrow C\rightarrow tT$.
Large QCD production cross-sections for $C$ enable us to probe heavier masses
for the VLQ and thereby allowing to put stronger limits on the vector-like
quarks which are produced in their decay chain. We adopt a universal analysis
strategy by including leptons under the classification of `jets', thereby
limiting the bias towards a specific combination of final state. We also study
the possibility of disentangling these scenarios from supersymmetric extensions
of the Standard Model by using simple discriminants based on jet multiplicity
and missing energy. We demonstrate that a simple set of cuts are sufficient to
disentangle the VLQ signal from the backgrounds. In models with a moderate
$B.R.(C\rightarrow Tt)$, the analysis enables one to get a hint of VLQ masses
as heavy as 3 TeV.
| [
{
"created": "Wed, 4 Oct 2017 09:23:13 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Deandrea",
"A.",
""
],
[
"Iyer",
"A. M.",
""
]
] | We investigate the production of heavy coloured scalars and vectors and their relevance at LHC for the study of vector-like quarks ($T$). These coloured states ($C$) are present in a large number of extensions of the standard model, in particular in composite models and in extra dimensional models. Assuming that these bosonic states are heavier than the vector-like quarks (VLQ), we consider their production through the process $p~p\rightarrow C\rightarrow tT$. Large QCD production cross-sections for $C$ enable us to probe heavier masses for the VLQ and thereby allowing to put stronger limits on the vector-like quarks which are produced in their decay chain. We adopt a universal analysis strategy by including leptons under the classification of `jets', thereby limiting the bias towards a specific combination of final state. We also study the possibility of disentangling these scenarios from supersymmetric extensions of the Standard Model by using simple discriminants based on jet multiplicity and missing energy. We demonstrate that a simple set of cuts are sufficient to disentangle the VLQ signal from the backgrounds. In models with a moderate $B.R.(C\rightarrow Tt)$, the analysis enables one to get a hint of VLQ masses as heavy as 3 TeV. |
1209.0144 | Shunsuke Ohkoda | Shunsuke Ohkoda, Y. Yamaguchi, S. Yasui, K. Sudoh, A. Hosaka | Exotic mesons with hidden charm and bottom near thresholds | 10 pages, 1 figure, to appear in the proceedings of The 5th
International Workshop on Charm Physics (Charm 2012) | null | 10.1007/s00601-013-0609-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study heavy hadron spectroscopy near heavy meson thresholds. We employ
heavy pseudoscalar meson P and heavy vector meson P* as effective degrees of
freedom and consider meson exchange potentials between them. All possible
composite states which can be constructed from the P and P* mesons are studied
up to the total angular momentum J <= 2. We consider, as exotic states,
isosinglet states with exotic J^{PC} quantum numbers and isotriplet states. We
solve numerically the Schr\"odinger equation with channel-couplings for each
state. We found B(*)barB(*) molecule states for I^G(J^{PC}) = 1^+(1^{+-})
correspond to the masses of twin resonances Zb(10610) and Zb(10650). We predict
several possible B(*)barB(*) bound and/or resonant states in other channels. On
the other hand, there are no B(*)barB(*) bound and/or resonant states whose
quantum numbers are exotic.
| [
{
"created": "Sun, 2 Sep 2012 02:14:10 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Sep 2012 13:33:03 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Ohkoda",
"Shunsuke",
""
],
[
"Yamaguchi",
"Y.",
""
],
[
"Yasui",
"S.",
""
],
[
"Sudoh",
"K.",
""
],
[
"Hosaka",
"A.",
""
]
] | We study heavy hadron spectroscopy near heavy meson thresholds. We employ heavy pseudoscalar meson P and heavy vector meson P* as effective degrees of freedom and consider meson exchange potentials between them. All possible composite states which can be constructed from the P and P* mesons are studied up to the total angular momentum J <= 2. We consider, as exotic states, isosinglet states with exotic J^{PC} quantum numbers and isotriplet states. We solve numerically the Schr\"odinger equation with channel-couplings for each state. We found B(*)barB(*) molecule states for I^G(J^{PC}) = 1^+(1^{+-}) correspond to the masses of twin resonances Zb(10610) and Zb(10650). We predict several possible B(*)barB(*) bound and/or resonant states in other channels. On the other hand, there are no B(*)barB(*) bound and/or resonant states whose quantum numbers are exotic. |
1310.8484 | Andrej Arbuzov | M.K. Volkov, A.B. Arbuzov, D.G. Kostunin | The process $e^+e^- \to \eta(\eta')2\pi$ in the extended NJL model | Estimations for decays $\tau\to\eta(\eta')2\pi\nu$ widths are added | Phys. Rev. C 89, 015202 (2014) | 10.1103/PhysRevC.89.015202 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Process of electron-positron annihilation into $\eta(\eta')2\pi$ is described
within the extended NJL model in the energy range up to about 2 GeV.
Contributions of intermediate vector mesons $\rho(770)$ and $\rho(1450)$ are
taken into account. Results for the $\eta2\pi$ channel are found to be in a
reasonable agreement with experimental data. Predictions for production of
$\eta' 2\pi$ are given. The corresponding estimations for decays
$\tau\to\eta(\eta')2\pi\nu$ are given in Appendix.
| [
{
"created": "Thu, 31 Oct 2013 13:04:55 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Dec 2013 06:21:28 GMT",
"version": "v2"
}
] | 2014-01-15 | [
[
"Volkov",
"M. K.",
""
],
[
"Arbuzov",
"A. B.",
""
],
[
"Kostunin",
"D. G.",
""
]
] | Process of electron-positron annihilation into $\eta(\eta')2\pi$ is described within the extended NJL model in the energy range up to about 2 GeV. Contributions of intermediate vector mesons $\rho(770)$ and $\rho(1450)$ are taken into account. Results for the $\eta2\pi$ channel are found to be in a reasonable agreement with experimental data. Predictions for production of $\eta' 2\pi$ are given. The corresponding estimations for decays $\tau\to\eta(\eta')2\pi\nu$ are given in Appendix. |
0811.4174 | Claudia Ratti | Claudia Ratti, Edward Shuryak | The role of monopoles in a Gluon Plasma | 60 pages, 15 Figures | Phys.Rev.D80:034004,2009 | 10.1103/PhysRevD.80.034004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the role of magnetic monopoles at high enough temperature $T>2T_c$,
when they can be considered heavy, rare objects embedded into matter consisting
mostly of the usual "electric" quasiparticles, quarks and gluons. We review
available lattice results on monopoles at finite temperatures. Then we proceed
to classical and quantum charge-monopole scattering, solving the problem of
gluon-monopole scattering for the first time. We find that, while this process
hardly influences thermodynamic quantities, it does produce a large transport
cross section, significantly exceeding that for pQCD gluon-gluon scattering up
to quite high $T$. Thus, in spite of their relatively small density at high
$T$, monopoles are extremely important for QGP transport properties, keeping
viscosity small enough for hydrodynamics to work at LHC.
| [
{
"created": "Tue, 25 Nov 2008 21:00:36 GMT",
"version": "v1"
}
] | 2009-09-02 | [
[
"Ratti",
"Claudia",
""
],
[
"Shuryak",
"Edward",
""
]
] | We study the role of magnetic monopoles at high enough temperature $T>2T_c$, when they can be considered heavy, rare objects embedded into matter consisting mostly of the usual "electric" quasiparticles, quarks and gluons. We review available lattice results on monopoles at finite temperatures. Then we proceed to classical and quantum charge-monopole scattering, solving the problem of gluon-monopole scattering for the first time. We find that, while this process hardly influences thermodynamic quantities, it does produce a large transport cross section, significantly exceeding that for pQCD gluon-gluon scattering up to quite high $T$. Thus, in spite of their relatively small density at high $T$, monopoles are extremely important for QGP transport properties, keeping viscosity small enough for hydrodynamics to work at LHC. |
hep-ph/0202082 | Gudrid Moortgat-Pick | Gudrid Moortgat--Pick (DESY) | Impact of beam polarization at a future linear collider | 7 pages, 5 eps figures, Contribution to Snowmass 2001 Summer Study | eConf C010630:E3008,2001 | null | null | hep-ph | null | Beam polarization at e^+e^- linear colliders will be a powerful tool for high
precision analyses. In this paper we summarize the polarization-related results
for Higgs and electroweak physics, QCD, Supersymmetry and alternative theories
beyond the Standard Model. Most studies were made for a planned linear collider
operating in the energy range sqrt{s}= 500-800 GeV. In particular we work out
the advantages of simultaneous polarization of the electron and positron beam.
| [
{
"created": "Fri, 8 Feb 2002 17:18:32 GMT",
"version": "v1"
}
] | 2011-01-13 | [
[
"Moortgat--Pick",
"Gudrid",
"",
"DESY"
]
] | Beam polarization at e^+e^- linear colliders will be a powerful tool for high precision analyses. In this paper we summarize the polarization-related results for Higgs and electroweak physics, QCD, Supersymmetry and alternative theories beyond the Standard Model. Most studies were made for a planned linear collider operating in the energy range sqrt{s}= 500-800 GeV. In particular we work out the advantages of simultaneous polarization of the electron and positron beam. |
hep-ph/0006357 | B. F. L. Ward | B.F.L. Ward (1, 2 and 3), ((1) Department of Physics and Astronomy,
The University of Tennessee, Knoxville, Tennessee, (2) SLAC, Stanford
University, Stanford, California, (3) TH Div., CERN, Geneva, Switzerland) | CP Violation in Exclusive B Decays: Recoil Phase Effect | 12 pages, 6 figures; replaced fig. 5 and its attendant discussion;
added affiliation; corrected typos; new title for journal | null | null | UTHEP-00-0102 | hep-ph | null | In the perturbative QCD approach to exclusive B decays to two light mesons,
the leading twist contribution corresponds to those diagrams in the
Lepage-Brodsky expansion in which the would be spectator quark receives its
recoil momentum via one gluon exchange. We show that the resulting amplitude,
which in the spectator model is real, acquires an imaginary part which may be
comparable in size to its real part. Thus, this source of the strong
interaction phase in the amplitude must be taken into account in general to
discuss, reliably, the expectations for CP violation in B decays at any
B-Factory type scenario.
| [
{
"created": "Fri, 30 Jun 2000 20:04:09 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jul 2000 11:37:55 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Aug 2000 18:43:06 GMT",
"version": "v3"
},
{
"created": "Tue, 10 Jul 2001 09:01:13 GMT",
"version": "v4"
}
] | 2009-09-25 | [
[
"Ward",
"B. F. L.",
"",
"1, 2 and 3"
]
] | In the perturbative QCD approach to exclusive B decays to two light mesons, the leading twist contribution corresponds to those diagrams in the Lepage-Brodsky expansion in which the would be spectator quark receives its recoil momentum via one gluon exchange. We show that the resulting amplitude, which in the spectator model is real, acquires an imaginary part which may be comparable in size to its real part. Thus, this source of the strong interaction phase in the amplitude must be taken into account in general to discuss, reliably, the expectations for CP violation in B decays at any B-Factory type scenario. |
2312.05870 | Wei-Jie Fu | Yong-rui Chen, Yang-yang Tan, Wei-jie Fu | Critical dynamics within the real-time fRG approach | 11 pages, 11 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The Schwinger-Keldysh functional renormalization group (fRG) developed in [1]
is employed to investigate critical dynamics related to a second-order phase
transition. The effective action of model A is expanded to the order of
$O(\partial^2)$ in the derivative expansion for the $O(N)$ symmetry. By solving
the fixed-point equations of effective potential and wave function, we obtain
static and dynamic critical exponents for different values of the spatial
dimension $d$ and the field component number $N$. It is found that one has $z
\geq 2$ in the whole range of $2\leq d\leq 4$ for the case of $N=1$, while in
the case of $N=4$ the dynamic critical exponent turns to $z < 2$ when the
dimension approach towards $d=2$.
| [
{
"created": "Sun, 10 Dec 2023 12:44:17 GMT",
"version": "v1"
}
] | 2023-12-12 | [
[
"Chen",
"Yong-rui",
""
],
[
"Tan",
"Yang-yang",
""
],
[
"Fu",
"Wei-jie",
""
]
] | The Schwinger-Keldysh functional renormalization group (fRG) developed in [1] is employed to investigate critical dynamics related to a second-order phase transition. The effective action of model A is expanded to the order of $O(\partial^2)$ in the derivative expansion for the $O(N)$ symmetry. By solving the fixed-point equations of effective potential and wave function, we obtain static and dynamic critical exponents for different values of the spatial dimension $d$ and the field component number $N$. It is found that one has $z \geq 2$ in the whole range of $2\leq d\leq 4$ for the case of $N=1$, while in the case of $N=4$ the dynamic critical exponent turns to $z < 2$ when the dimension approach towards $d=2$. |
0709.0950 | David Morrissey | Yanou Cui, Stephen P. Martin, David E. Morrissey, James D. Wells | Cosmic Strings from Supersymmetric Flat Directions | 58 pages, 16 figures, v2. accepted to PRD, added comments about
baryogenesis and boosted decay products from cusp annihilation | Phys.Rev.D77:043528,2008 | 10.1103/PhysRevD.77.043528 | MCTP-07-28, CERN-PH-TH/2007-151 | hep-ph astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flat directions are a generic feature of the scalar potential in
supersymmetric gauge field theories. They can arise, for example, from D-terms
associated with an extra abelian gauge symmetry. Even when supersymmetry is
broken softly, there often remain directions in the scalar field space along
which the potential is almost flat. Upon breaking a gauge symmetry along one of
these almost flat directions, cosmic strings may form. Relative to the standard
cosmic string picture based on the abelian Higgs model, these flat-direction
cosmic strings have the extreme Type-I properties of a thin gauge core
surrounded by a much wider scalar field profile. We perform a comprehensive
study of the microscopic, macroscopic, and observational characteristics of
this class of strings. We find many differences from the standard string
scenario, including stable higher winding mode strings, the dynamical formation
of higher mode strings from lower ones, and a resultant multi-tension scaling
string network in the early universe. These strings are only moderately
constrained by current observations, and their gravitational wave signatures
may be detectable at future gravity wave detectors. Furthermore, there is the
interesting but speculative prospect that the decays of cosmic string loops in
the early universe could be a source of ultra-high energy cosmic rays or
non-thermal dark matter. We also compare the observational signatures of
flat-direction cosmic strings with those of ordinary cosmic strings as well as
(p,q) cosmic strings motivated by superstring theory.
| [
{
"created": "Thu, 6 Sep 2007 20:18:29 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jul 2008 20:58:37 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cui",
"Yanou",
""
],
[
"Martin",
"Stephen P.",
""
],
[
"Morrissey",
"David E.",
""
],
[
"Wells",
"James D.",
""
]
] | Flat directions are a generic feature of the scalar potential in supersymmetric gauge field theories. They can arise, for example, from D-terms associated with an extra abelian gauge symmetry. Even when supersymmetry is broken softly, there often remain directions in the scalar field space along which the potential is almost flat. Upon breaking a gauge symmetry along one of these almost flat directions, cosmic strings may form. Relative to the standard cosmic string picture based on the abelian Higgs model, these flat-direction cosmic strings have the extreme Type-I properties of a thin gauge core surrounded by a much wider scalar field profile. We perform a comprehensive study of the microscopic, macroscopic, and observational characteristics of this class of strings. We find many differences from the standard string scenario, including stable higher winding mode strings, the dynamical formation of higher mode strings from lower ones, and a resultant multi-tension scaling string network in the early universe. These strings are only moderately constrained by current observations, and their gravitational wave signatures may be detectable at future gravity wave detectors. Furthermore, there is the interesting but speculative prospect that the decays of cosmic string loops in the early universe could be a source of ultra-high energy cosmic rays or non-thermal dark matter. We also compare the observational signatures of flat-direction cosmic strings with those of ordinary cosmic strings as well as (p,q) cosmic strings motivated by superstring theory. |
2303.15388 | Jorge Segovia | Gang Yang, Jialun Ping and Jorge Segovia | Charmoniumlike tetraquarks in a chiral quark model | 22 pages, 10 figures, 21 tables. arXiv admin note: text overlap with
arXiv:2101.04933, arXiv:2204.08556, arXiv:2109.04311 | null | null | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The lowest-lying charmonium-like tetraquarks $c\bar{c}q\bar{q}$ $(q=u,\,d)$
and $c\bar{c}s\bar{s}$, with spin-parity $J^P=0^+$, $1^+$ and $2^+$, and
isospin $I=0$ and $1$, are systematically investigated within the theoretical
framework of complex-scaling range for a chiral quark model that has already
been successfully applied in former studies of various tetra- and penta-quark
systems. A four-body $S$-wave configuration which includes meson-meson,
diquark-antidiquark and K-type arrangements of quarks, along with all possible
color wave functions, is comprehensively considered. Several narrow resonances
are obtained in each tetraquark channel when a fully coupled-channel
computation is performed. We tentatively assign theoretical states to
experimentally reported charmonium-like signals such as $X(3872)$, $Z_c(3900)$,
$X(3960)$, $X(4350)$, $X(4685)$ and $X(4700)$. They can be well identified as
hadronic molecules; however, other exotic components which involve, for
instance, hidden-color channels or diquark-antidiquark structures play a
considerable role. Meanwhile, two resonances are obtained at $4.04$ GeV and
$4.14$ GeV which may be compatible with experimental data in the energy
interval $4.0-4.2$ GeV. Furthermore, the $X(3940)$ and $X(4630)$ may be
identified as color compact tetraquark resonances. Finally, we also find few
resonance states in the energy interval from $4.5$ GeV to $5.0$ GeV, which
would be awaiting for discovery in future experiments.
| [
{
"created": "Mon, 27 Mar 2023 17:00:37 GMT",
"version": "v1"
}
] | 2023-03-28 | [
[
"Yang",
"Gang",
""
],
[
"Ping",
"Jialun",
""
],
[
"Segovia",
"Jorge",
""
]
] | The lowest-lying charmonium-like tetraquarks $c\bar{c}q\bar{q}$ $(q=u,\,d)$ and $c\bar{c}s\bar{s}$, with spin-parity $J^P=0^+$, $1^+$ and $2^+$, and isospin $I=0$ and $1$, are systematically investigated within the theoretical framework of complex-scaling range for a chiral quark model that has already been successfully applied in former studies of various tetra- and penta-quark systems. A four-body $S$-wave configuration which includes meson-meson, diquark-antidiquark and K-type arrangements of quarks, along with all possible color wave functions, is comprehensively considered. Several narrow resonances are obtained in each tetraquark channel when a fully coupled-channel computation is performed. We tentatively assign theoretical states to experimentally reported charmonium-like signals such as $X(3872)$, $Z_c(3900)$, $X(3960)$, $X(4350)$, $X(4685)$ and $X(4700)$. They can be well identified as hadronic molecules; however, other exotic components which involve, for instance, hidden-color channels or diquark-antidiquark structures play a considerable role. Meanwhile, two resonances are obtained at $4.04$ GeV and $4.14$ GeV which may be compatible with experimental data in the energy interval $4.0-4.2$ GeV. Furthermore, the $X(3940)$ and $X(4630)$ may be identified as color compact tetraquark resonances. Finally, we also find few resonance states in the energy interval from $4.5$ GeV to $5.0$ GeV, which would be awaiting for discovery in future experiments. |
0801.2414 | Gudrid Moortgat-Pick | Gudrid Moortgat-Pick | LHC/ILC Interplay in SUSY Searches | 5 pages, contribution to the proceedings of EPS07 | J.Phys.Conf.Ser.110:072027,2008 | 10.1088/1742-6596/110/7/072027 | IPPP/07/70, DCPT/07/140 | hep-ph | null | Combined analyses at the Large Hadron Collider and at the International
Linear Collider are important to reveal precisely the new physics model as, for
instance, supersymmetry. Examples are presented where ILC results as input for
LHC analyses could be crucial for the identification of signals as well as of
the underlying model. The synergy of both colliders leads also to rather
accurate SUSY parameter determination and powerful mass constraints even if the
scalar particles have masses in the multi-TeV range.
| [
{
"created": "Wed, 16 Jan 2008 01:15:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Moortgat-Pick",
"Gudrid",
""
]
] | Combined analyses at the Large Hadron Collider and at the International Linear Collider are important to reveal precisely the new physics model as, for instance, supersymmetry. Examples are presented where ILC results as input for LHC analyses could be crucial for the identification of signals as well as of the underlying model. The synergy of both colliders leads also to rather accurate SUSY parameter determination and powerful mass constraints even if the scalar particles have masses in the multi-TeV range. |
hep-ph/9809438 | Christoph Greub | F. Borzumati (Montpellier) and C. Greub (Bern) | Addendum to: 2HDMs predictions for $B \to X_s \gamma$ in NLO QCD | 4 pages including 1 postscript figure; uses epsfig. Addendum to
hep-ph/9802391 | Phys.Rev.D59:057501,1999 | 10.1103/PhysRevD.59.057501 | PM/98-22, BUTP-98/24 | hep-ph | null | We update our work ``Two Higgs Doublet Model predictions for B->X_s gamma in
NLO QCD'', hep-ph/9802391 by taking into account the recently calculated
electromagnetic corrections. We present a new exclusion contour plot
(tan(\beta),m_H), where these corrections are included.
| [
{
"created": "Thu, 17 Sep 1998 19:13:02 GMT",
"version": "v1"
}
] | 2011-01-05 | [
[
"Borzumati",
"F.",
"",
"Montpellier"
],
[
"Greub",
"C.",
"",
"Bern"
]
] | We update our work ``Two Higgs Doublet Model predictions for B->X_s gamma in NLO QCD'', hep-ph/9802391 by taking into account the recently calculated electromagnetic corrections. We present a new exclusion contour plot (tan(\beta),m_H), where these corrections are included. |
2302.01956 | Juliane Haug | Juliane Haug and Fabian Wunder | The massless non-adjacent double off-shell scalar box integral -- branch
cut structure and all-order epsilon expansion | 8 pages, 1 figure, updated to match version published in JHEP | JHEP 05 (2023) 059 | 10.1007/JHEP05(2023)059 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We generalize the result of our recent paper on the massless single off-shell
scalar box integral to the case of two non-adjacent end points off the light
cone. An analytic result in $d=4-2\varepsilon$ dimensions is established in
terms of four Gauss hypergeometric ${_2}\mathrm{F}_1$ functions respectively
their single-valued counterparts. This allows for an explicit splitting of real
and imaginary parts, as well as an all-order $\varepsilon$-expansion in terms
of single-valued polylogarithms.
| [
{
"created": "Fri, 3 Feb 2023 19:07:45 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Feb 2023 17:21:01 GMT",
"version": "v2"
},
{
"created": "Wed, 10 May 2023 15:34:00 GMT",
"version": "v3"
}
] | 2023-05-11 | [
[
"Haug",
"Juliane",
""
],
[
"Wunder",
"Fabian",
""
]
] | We generalize the result of our recent paper on the massless single off-shell scalar box integral to the case of two non-adjacent end points off the light cone. An analytic result in $d=4-2\varepsilon$ dimensions is established in terms of four Gauss hypergeometric ${_2}\mathrm{F}_1$ functions respectively their single-valued counterparts. This allows for an explicit splitting of real and imaginary parts, as well as an all-order $\varepsilon$-expansion in terms of single-valued polylogarithms. |
0804.3053 | Peter Richardson | M. Bahr, S. Gieseke, M. Gigg, D. Grellscheid, K. Hamilton, O.
Latunde-Dada, S. Platzer, P. Richardson, M. H. Seymour, A. Sherstnev, B. R.
Webber | Herwig++ 2.2 Release Note | 5 pages | null | null | Cavendish-HEP-08/05, CERN-PH-TH/2008-080, CP3-08-08, IPPP/08/26,
DCPT/08/52, KA-TP-09-2008 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new release of the Monte Carlo program Herwig++ (version 2.2) is now
available. This version includes a number of improvements including: matrix
elements for the production of an electroweak gauge boson, W and Z, in
association with a jet; several new processes for Higgs production in
association with an electroweak gauge boson; and the matrix element correction
for QCD radiation in Higgs production via gluon fusion.
| [
{
"created": "Fri, 18 Apr 2008 15:49:27 GMT",
"version": "v1"
}
] | 2008-04-21 | [
[
"Bahr",
"M.",
""
],
[
"Gieseke",
"S.",
""
],
[
"Gigg",
"M.",
""
],
[
"Grellscheid",
"D.",
""
],
[
"Hamilton",
"K.",
""
],
[
"Latunde-Dada",
"O.",
""
],
[
"Platzer",
"S.",
""
],
[
"Richardson",
"... | A new release of the Monte Carlo program Herwig++ (version 2.2) is now available. This version includes a number of improvements including: matrix elements for the production of an electroweak gauge boson, W and Z, in association with a jet; several new processes for Higgs production in association with an electroweak gauge boson; and the matrix element correction for QCD radiation in Higgs production via gluon fusion. |
hep-ph/0212083 | Jose Bordes | J. Bordes, J. Penarrocha and K. Schilcher | Bottom quark mass and QCD duality | 10 pages, 2 figures | Phys.Lett.B562:81-86,2003 | 10.1016/S0370-2693(03)00542-2 | MZ-TH/02-31, FTUV-0412/02 | hep-ph | null | The mass of the bottom quark is analyzed in the context of QCD finite energy
sum rules. In contrast to the conventional approach, we use a large momentum
expansion of the QCD correlator including terms to order \alpha
_{s}^{2}(m_{b}^{2}/q^{2})^{6} with the upsilon resonances from e^{+}e^{-}
annihilation data as main input. A stable result m_{b}(m_{b})=4.19\pm 0.05 GeV}
for the bottom quark mass is obtained. This result agrees with the independent
calculations based on the inverse moment analysis.
| [
{
"created": "Thu, 5 Dec 2002 14:43:56 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Mar 2003 11:36:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bordes",
"J.",
""
],
[
"Penarrocha",
"J.",
""
],
[
"Schilcher",
"K.",
""
]
] | The mass of the bottom quark is analyzed in the context of QCD finite energy sum rules. In contrast to the conventional approach, we use a large momentum expansion of the QCD correlator including terms to order \alpha _{s}^{2}(m_{b}^{2}/q^{2})^{6} with the upsilon resonances from e^{+}e^{-} annihilation data as main input. A stable result m_{b}(m_{b})=4.19\pm 0.05 GeV} for the bottom quark mass is obtained. This result agrees with the independent calculations based on the inverse moment analysis. |
hep-ph/0210201 | Alexander Penin | A.A. Penin | Potential Nonrelativistic QCD and Heavy Quarkonium Spectrum in
Next-to-Next-to-Next-to-Leading Order | 5 pages LaTeX, Talk presented at RADCOR/LL 2002 conference, Kloster
Banz, Germany, September 8-13, 2002 | Nucl.Phys.Proc.Suppl. 116 (2003) 373-377 | 10.1016/S0920-5632(03)80202-5 | null | hep-ph | null | In this talk I review the calculation of the third order corrections to the
heavy quarkonium spectrum in the nonrelativistic effective theory framework and
its application to the phenomenology of top quark threshold production.
| [
{
"created": "Mon, 14 Oct 2002 10:55:56 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Penin",
"A. A.",
""
]
] | In this talk I review the calculation of the third order corrections to the heavy quarkonium spectrum in the nonrelativistic effective theory framework and its application to the phenomenology of top quark threshold production. |
0712.1016 | Thomas Binoth Dr. | A. D. Kennedy, T. Binoth, T. Rippon | Automating Renormalization of Quantum Field Theories | Invited talk given by A.D. Kennedy at the International Workshop on
Symbolic-Numeric Computation'07, University of Western Ontario, Canada | Proceedings of the 2007 international workshop on Symbolic-numeric
computation, London, Ontario, Canada, 18-27 (2007). ISBN:978-1-59593-744-5 | null | Edinburgh 2007/46 | hep-ph | null | We give an overview of state-of-the-art multi-loop Feynman diagram
computations, and explain how we use symbolic manipulation to generate
renormalized integrals that are then evaluated numerically. We explain how we
automate BPHZ renormalization using "henges" and "sectors", and give a brief
description of the symbolic tensor and Dirac gamma-matrix manipulation that is
required. We shall compare the use of general computer algebra systems such as
Maple with domain-specific languages such as
FORM, highlighting in particular memory management issues.
| [
{
"created": "Thu, 6 Dec 2007 19:33:28 GMT",
"version": "v1"
}
] | 2007-12-07 | [
[
"Kennedy",
"A. D.",
""
],
[
"Binoth",
"T.",
""
],
[
"Rippon",
"T.",
""
]
] | We give an overview of state-of-the-art multi-loop Feynman diagram computations, and explain how we use symbolic manipulation to generate renormalized integrals that are then evaluated numerically. We explain how we automate BPHZ renormalization using "henges" and "sectors", and give a brief description of the symbolic tensor and Dirac gamma-matrix manipulation that is required. We shall compare the use of general computer algebra systems such as Maple with domain-specific languages such as FORM, highlighting in particular memory management issues. |
hep-ph/0005080 | Sacha Davidson | Sacha Davidson, Marta Losada | Neutrino masses in the R-parity violating MSSM | mass dimensions in column four of table corrected | JHEP 0005 (2000) 021 | 10.1088/1126-6708/2000/05/021 | null | hep-ph | null | We compute one loop neutrino masses in the R-parity violating Minimal
Supersymmetric Model, including the bilinear R-parity violating masses in the
mass insertion approximation. To the order we calculate, our results are
independent of the Higgs-lepton basis choice. We have a variety of perturbative
parameters-gauge, yukawa and trilinear couplings, and R_p violating masses.
Their relative magnitudes determine which diagrams are relevant for neutrino
mass calculations. We find new loop diagrams which can be relevant and have
frequently been neglected in the past. For the Grossman-Haber neutral loop
contribution to the neutrino mass matrix we obtain explicit analytic results.
| [
{
"created": "Tue, 9 May 2000 12:59:24 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jun 2000 20:08:32 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Nov 2000 14:01:25 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Davidson",
"Sacha",
""
],
[
"Losada",
"Marta",
""
]
] | We compute one loop neutrino masses in the R-parity violating Minimal Supersymmetric Model, including the bilinear R-parity violating masses in the mass insertion approximation. To the order we calculate, our results are independent of the Higgs-lepton basis choice. We have a variety of perturbative parameters-gauge, yukawa and trilinear couplings, and R_p violating masses. Their relative magnitudes determine which diagrams are relevant for neutrino mass calculations. We find new loop diagrams which can be relevant and have frequently been neglected in the past. For the Grossman-Haber neutral loop contribution to the neutrino mass matrix we obtain explicit analytic results. |
hep-ph/9910527 | Avtandil Tkabladze | J. Gegelia, G. Japaridze, A. Tkabladze, A. Khelashvili, and K.
Turashvili | On the Gauge Invariance of the Z-Boson Mass | 11 pages, LaTeX, talk presented at the Conference "Quarks-92",
Zvenigorod Russia, 1992, comments added | null | null | null | hep-ph | null | The different schemes for the definition of the Z boson mass are analyzed. It
is shown that the scheme, defining the mass as pole of the real part of the Z
boson propagator and the width as the imaginary part of the propagator at the
same point results in the gauge dependent results for these parameters in a
two-loop approximation. On the other hand, the scheme, where the mass and width
are related to the position of the pole of the propagator in the complex plane
leads to the gauge independent result. It is argued that the gauge dependence
of mass and width does not contradicts to the gauge invariance of the
amplitude.
| [
{
"created": "Thu, 28 Oct 1999 19:19:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gegelia",
"J.",
""
],
[
"Japaridze",
"G.",
""
],
[
"Tkabladze",
"A.",
""
],
[
"Khelashvili",
"A.",
""
],
[
"Turashvili",
"K.",
""
]
] | The different schemes for the definition of the Z boson mass are analyzed. It is shown that the scheme, defining the mass as pole of the real part of the Z boson propagator and the width as the imaginary part of the propagator at the same point results in the gauge dependent results for these parameters in a two-loop approximation. On the other hand, the scheme, where the mass and width are related to the position of the pole of the propagator in the complex plane leads to the gauge independent result. It is argued that the gauge dependence of mass and width does not contradicts to the gauge invariance of the amplitude. |
1310.6701 | Yuri V. Kovchegov | Yuri V. Kovchegov, Douglas E. Wertepny | Two-Gluon Correlations in Heavy-Light Ion Collisions: Energy and
Geometry Dependence, IR Divergences, and $k_T$-Factorization | 30 pages, 6 figures; v2: typos corrected, references added | null | 10.1016/j.nuclphysa.2014.02.021 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of the cross section for two-gluon production in
heavy-light ion collisions derived in our previous paper on the subject in the
saturation/Color Glass Condensate framework. Concentrating on the energy and
geometry dependence of the corresponding correlation functions we find that the
two-gluon correlator is a much slower function of the center-of-mass energy
than the one- and two-gluon production cross sections. The geometry dependence
of the correlation function leads to stronger azimuthal near- and away-side
correlations in the tip-on-tip U+U collisions than in the side-on-side U+U
collisions, an exactly opposite behavior from the correlations generated by the
elliptic flow of the quark-gluon plasma: a study of azimuthal correlations in
the U+U collisions may thus help to disentangle the two sources of
correlations.
We demonstrate that the cross section for two-gluon production in heavy-light
ion collisions contains a power-law infrared (IR) divergence even for fixed
produced gluon momenta: while saturation effects in the target regulate some of
the power-law IR-divergent terms in the lowest-order expression for the
two-gluon correlator, other power-law IR-divergent terms remain, possibly due
to absence of saturation effects in the dilute projectile. Finally we rewrite
our result for the two-gluon production cross-section in a $k_T$-factorized
form, obtaining a new factorized expression involving a convolution of one- and
two-gluon Wigner distributions over both the transverse momenta and impact
parameters. We show that the two-gluon production cross-section depends on two
different types of unintegrated two-gluon Wigner distribution functions.
| [
{
"created": "Thu, 24 Oct 2013 18:42:27 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Mar 2014 16:42:25 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Kovchegov",
"Yuri V.",
""
],
[
"Wertepny",
"Douglas E.",
""
]
] | We study the properties of the cross section for two-gluon production in heavy-light ion collisions derived in our previous paper on the subject in the saturation/Color Glass Condensate framework. Concentrating on the energy and geometry dependence of the corresponding correlation functions we find that the two-gluon correlator is a much slower function of the center-of-mass energy than the one- and two-gluon production cross sections. The geometry dependence of the correlation function leads to stronger azimuthal near- and away-side correlations in the tip-on-tip U+U collisions than in the side-on-side U+U collisions, an exactly opposite behavior from the correlations generated by the elliptic flow of the quark-gluon plasma: a study of azimuthal correlations in the U+U collisions may thus help to disentangle the two sources of correlations. We demonstrate that the cross section for two-gluon production in heavy-light ion collisions contains a power-law infrared (IR) divergence even for fixed produced gluon momenta: while saturation effects in the target regulate some of the power-law IR-divergent terms in the lowest-order expression for the two-gluon correlator, other power-law IR-divergent terms remain, possibly due to absence of saturation effects in the dilute projectile. Finally we rewrite our result for the two-gluon production cross-section in a $k_T$-factorized form, obtaining a new factorized expression involving a convolution of one- and two-gluon Wigner distributions over both the transverse momenta and impact parameters. We show that the two-gluon production cross-section depends on two different types of unintegrated two-gluon Wigner distribution functions. |
1410.1304 | Yannis Burnier | Yannis Burnier (EPFL) | Quarkonium spectral function in medium at next-to-leading order for any
quark mass | 22 pages, 4 figures | null | null | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The vector channel spectral function at zero spatial momentum is calculated
at next-to-leading order in thermal QCD for any quark mass. It corresponds to
the imaginary part of the massive quark contribution to the photon polarization
tensor. The spectrum shows a well defined transport peak in contrast to both
the heavy quark limit studied previously, where the low frequency domain is
exponentially suppressed at this order and the naive massless case where it
vanishes at leading order and diverges at next-to-leading order. From our
general expressions, the massless limit can be taken and we show that no
divergences occur if done carefully. Finally, we compare the massless limit to
results from lattice simulations.
| [
{
"created": "Mon, 6 Oct 2014 09:45:00 GMT",
"version": "v1"
}
] | 2014-10-07 | [
[
"Burnier",
"Yannis",
"",
"EPFL"
]
] | The vector channel spectral function at zero spatial momentum is calculated at next-to-leading order in thermal QCD for any quark mass. It corresponds to the imaginary part of the massive quark contribution to the photon polarization tensor. The spectrum shows a well defined transport peak in contrast to both the heavy quark limit studied previously, where the low frequency domain is exponentially suppressed at this order and the naive massless case where it vanishes at leading order and diverges at next-to-leading order. From our general expressions, the massless limit can be taken and we show that no divergences occur if done carefully. Finally, we compare the massless limit to results from lattice simulations. |
hep-ph/0607257 | Angels Ramos | T. Mizutani and A. Ramos | D Mesons in Nuclear Matter: A DN Coupled-Channel Equations Approach | 30 pages, 8 eps figures, some typos and coefficients corrected,
published in Phys. Rev. C | Phys.Rev.C74:065201,2006 | 10.1103/PhysRevC.74.065201 | null | hep-ph nucl-th | null | A set of coupled two-body scattering equations is solved for the DN system
embedded in an iso-symmetric nuclear matter. The in-medium behavior of charmed
D mesons: (D^+,D^0), is investigated from the self-consistent solution within
this scheme. The effective meson-baryon Lagrangian in charm quantum number one
sector, the key ingredient in the present study, is adopted from a recent model
by Hofmann and Lutz which has aimed at combining the charmed meson degree of
freedom in a consistent manner with chiral unitary models. After a critical
examination, the original model is modified in several important aspects, such
as the method of regularization, in order to be more consistent and practical
for our objective. The resultant interaction is used to reproduce the position
and width of the s-wave \Lambda_c(2593) resonance in the isospin zero DN
channel. In the isospin one channel, it generates a rather wide resonance at
\~2770 MeV. The corresponding in-medium solution is then sought by
incorporating Pauli blocking and the D- and \pi-meson dressing
self-consistently. At normal nuclear matter density, the resultant \Lambda_c
(2593) is found to stay narrow and shifted at a lower energy, while the I=1
resonance is lowered in position as well and broadened considerably. The
possible implication of our findings on the J/\Psi suppression, etc. in
relativistic heavy ion collisions is briefly discussed.
| [
{
"created": "Mon, 24 Jul 2006 07:05:27 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2006 14:32:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mizutani",
"T.",
""
],
[
"Ramos",
"A.",
""
]
] | A set of coupled two-body scattering equations is solved for the DN system embedded in an iso-symmetric nuclear matter. The in-medium behavior of charmed D mesons: (D^+,D^0), is investigated from the self-consistent solution within this scheme. The effective meson-baryon Lagrangian in charm quantum number one sector, the key ingredient in the present study, is adopted from a recent model by Hofmann and Lutz which has aimed at combining the charmed meson degree of freedom in a consistent manner with chiral unitary models. After a critical examination, the original model is modified in several important aspects, such as the method of regularization, in order to be more consistent and practical for our objective. The resultant interaction is used to reproduce the position and width of the s-wave \Lambda_c(2593) resonance in the isospin zero DN channel. In the isospin one channel, it generates a rather wide resonance at \~2770 MeV. The corresponding in-medium solution is then sought by incorporating Pauli blocking and the D- and \pi-meson dressing self-consistently. At normal nuclear matter density, the resultant \Lambda_c (2593) is found to stay narrow and shifted at a lower energy, while the I=1 resonance is lowered in position as well and broadened considerably. The possible implication of our findings on the J/\Psi suppression, etc. in relativistic heavy ion collisions is briefly discussed. |
1509.00423 | Juan Helo | J. C. Helo, M. Hirsch | LHC dijet constraints on double beta decay | 13 pages, 5 figures | Phys. Rev. D 92, 073017 (2015) | 10.1103/PhysRevD.92.073017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use LHC dijet data to derive constraints on neutrinoless double beta
decay. Upper limits on cross sections for the production of "exotic"
resonances, such as a right-handed W boson or a diquark, can be converted into
lower limits on the double beta decay half-life for fixed choices of other
parameters. Constraints derived from run-I data are already surprisingly strong
and complementary to results from searches using same-sign dileptons plus jets.
For the case of the left-right symmetric model, in case no new resonance is
found in future runs of the LHC and assuming $g_L=g_R$, we estimate a lower
limit on the double beta decay half-live larger than $10^{27}$ ys can be
derived from future dijet data, except in the window of relatively light
right-handed neutrino masses in the range $0.5$ MeV to $50$ GeV. Part of this
mass window will be tested in the upcoming SHiP experiment. We also discuss
current and future limits on possible scalar diquark contributions to double
beta decay that can be derived from dijet data.
| [
{
"created": "Tue, 1 Sep 2015 18:18:09 GMT",
"version": "v1"
}
] | 2015-11-04 | [
[
"Helo",
"J. C.",
""
],
[
"Hirsch",
"M.",
""
]
] | We use LHC dijet data to derive constraints on neutrinoless double beta decay. Upper limits on cross sections for the production of "exotic" resonances, such as a right-handed W boson or a diquark, can be converted into lower limits on the double beta decay half-life for fixed choices of other parameters. Constraints derived from run-I data are already surprisingly strong and complementary to results from searches using same-sign dileptons plus jets. For the case of the left-right symmetric model, in case no new resonance is found in future runs of the LHC and assuming $g_L=g_R$, we estimate a lower limit on the double beta decay half-live larger than $10^{27}$ ys can be derived from future dijet data, except in the window of relatively light right-handed neutrino masses in the range $0.5$ MeV to $50$ GeV. Part of this mass window will be tested in the upcoming SHiP experiment. We also discuss current and future limits on possible scalar diquark contributions to double beta decay that can be derived from dijet data. |
hep-ph/0203195 | Tuomas Multamaki | T. Multamaki, I. Vilja | Simulations of Q-Ball Formation | 9 pages, 8 figures; corrected typos (v2,v3) | Phys.Lett. B535 (2002) 170-176 | 10.1016/S0370-2693(02)01730-6 | TURKU-FL-P39-02 | hep-ph | null | The fragmentation of the Affleck-Dine condensate is studied by utilizing 3+1
dimensional numerical simulations. The 3+1 dimensional simulations confirm that
the fragmentation process is very similar to the results obtained by 2+1
dimensional simulations. We find, however, that the average size of Q-balls in
3+1 dimensions is somewhat larger that in 2+1 dimensions. A filament type
structure in the charge density is observed during the fragmentation process.
The resulting final Q-ball distribution is strongly dependent on the initial
conditions of the condensate and approaches a thermal one as the energy-charge
ratio of the Affleck-Dine condensate increases.
| [
{
"created": "Wed, 20 Mar 2002 10:56:48 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Mar 2002 12:38:26 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Apr 2002 06:35:56 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Multamaki",
"T.",
""
],
[
"Vilja",
"I.",
""
]
] | The fragmentation of the Affleck-Dine condensate is studied by utilizing 3+1 dimensional numerical simulations. The 3+1 dimensional simulations confirm that the fragmentation process is very similar to the results obtained by 2+1 dimensional simulations. We find, however, that the average size of Q-balls in 3+1 dimensions is somewhat larger that in 2+1 dimensions. A filament type structure in the charge density is observed during the fragmentation process. The resulting final Q-ball distribution is strongly dependent on the initial conditions of the condensate and approaches a thermal one as the energy-charge ratio of the Affleck-Dine condensate increases. |
1204.1337 | Timothy Cohen | Timothy Cohen, Anson Hook, and Gonzalo Torroba | An Attractor for Natural Supersymmetry | 22 pages, 4 figures; v2 refs added; v3 journal version | null | 10.1103/PhysRevD.86.115005 | SLAC-PUB-14924 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an attractor mechanism which generates the "more minimal"
supersymmetric standard model from a broad class of supersymmetry breaking
boundary conditions. The hierarchies in the fermion masses and mixings are
produced by the same dynamics and a natural weak scale results from gaugino
mediation. These features arise from augmenting the standard model with a new
SU(3) gauge group under which only the third generation quarks are charged. The
theory flows to a strongly interacting fixed point which induces a negative
anomalous dimension for the third generation quarks and a positive anomalous
dimension for the Higgs. As a result, a split-family natural spectrum and the
flavor hierarchies are dynamically generated.
| [
{
"created": "Thu, 5 Apr 2012 20:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jun 2012 18:03:18 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Oct 2012 23:06:55 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Cohen",
"Timothy",
""
],
[
"Hook",
"Anson",
""
],
[
"Torroba",
"Gonzalo",
""
]
] | We propose an attractor mechanism which generates the "more minimal" supersymmetric standard model from a broad class of supersymmetry breaking boundary conditions. The hierarchies in the fermion masses and mixings are produced by the same dynamics and a natural weak scale results from gaugino mediation. These features arise from augmenting the standard model with a new SU(3) gauge group under which only the third generation quarks are charged. The theory flows to a strongly interacting fixed point which induces a negative anomalous dimension for the third generation quarks and a positive anomalous dimension for the Higgs. As a result, a split-family natural spectrum and the flavor hierarchies are dynamically generated. |
0707.3202 | Wolfgang Lucha | Z.-F. Li, Wolfgang Lucha, F. Schoberl | Stability in the instantaneous Bethe-Salpeter formalism:
harmonic-oscillator reduced Salpeter equation | 23 pages, 3 figures, extended conclusions, version to appear in Phys.
Rev. D | Phys.Rev.D76:125028,2007 | 10.1103/PhysRevD.76.125028 | HEPHY-PUB 843/07 | hep-ph nucl-th | null | A popular three-dimensional reduction of the Bethe-Salpeter formalism for the
description of bound states in quantum field theory is the Salpeter equation,
derived by assuming both instantaneous interactions and free propagation of all
bound-state constituents. Numerical (variational) studies of the Salpeter
equation with confining interaction, however, observed specific instabilities
of the solutions, likely related to the Klein paradox and rendering (part of
the) bound states unstable. An analytic investigation of this problem by a
comprehensive spectral analysis is feasible for the reduced Salpeter equation
with only harmonic-oscillator confining interactions. There we are able to
prove rigorously that the bound-state solutions correspond to real discrete
energy spectra bounded from below and are thus free of any instabilities.
| [
{
"created": "Mon, 23 Jul 2007 06:22:25 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2007 09:52:01 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Li",
"Z. -F.",
""
],
[
"Lucha",
"Wolfgang",
""
],
[
"Schoberl",
"F.",
""
]
] | A popular three-dimensional reduction of the Bethe-Salpeter formalism for the description of bound states in quantum field theory is the Salpeter equation, derived by assuming both instantaneous interactions and free propagation of all bound-state constituents. Numerical (variational) studies of the Salpeter equation with confining interaction, however, observed specific instabilities of the solutions, likely related to the Klein paradox and rendering (part of the) bound states unstable. An analytic investigation of this problem by a comprehensive spectral analysis is feasible for the reduced Salpeter equation with only harmonic-oscillator confining interactions. There we are able to prove rigorously that the bound-state solutions correspond to real discrete energy spectra bounded from below and are thus free of any instabilities. |
hep-ph/0510034 | Alan R. White | Alan. R. White | Sextet Quarks and the Pomeron at the LHC | 6 pages, 3 figures, presented at the XIth Blois Conference on Elastic
and Diffractive Scattering, Blois, France, May, 2005 | null | null | null | hep-ph | null | Adding two color sextet quarks to QCD gives many special features. The
high-energy S-Matrix, constructed via reggeon diagrams and chiral anomalies,
contains the Critical Pomeron and electroweak symmetry breaking is produced, by
sextet pions. Cosmic ray phenomena suggest large cross-section effects will be
seen at the LHC, in particular, involving the pomeron. The sextet sector
embeds, uniquely, in a massless, confining, left-handed SU(5) theory. The
anomaly based high-energy S-Matrix could be that of the full Standard Model.
| [
{
"created": "Mon, 3 Oct 2005 19:56:00 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"White",
"Alan. R.",
""
]
] | Adding two color sextet quarks to QCD gives many special features. The high-energy S-Matrix, constructed via reggeon diagrams and chiral anomalies, contains the Critical Pomeron and electroweak symmetry breaking is produced, by sextet pions. Cosmic ray phenomena suggest large cross-section effects will be seen at the LHC, in particular, involving the pomeron. The sextet sector embeds, uniquely, in a massless, confining, left-handed SU(5) theory. The anomaly based high-energy S-Matrix could be that of the full Standard Model. |
1006.2857 | Danny Marfatia | Steve Blanchet, Danny Marfatia, Azar Mustafayev | Examining leptogenesis with lepton flavor violation and the dark matter
abundance | 20 pages, 5 figures, 1 table | JHEP 1011:038,2010 | 10.1007/JHEP11(2010)038 | UMN-TH-2907/10, FTPI-MINN-10/15, UMD-PP-10-009 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within a supersymmetric (SUSY) type-I seesaw framework with flavor-blind
universal boundary conditions, we study the consequences of requiring that the
observed baryon asymmetry of the Universe be explained by either thermal or
non-thermal leptogenesis. In the former case, we find that the parameter space
is very constrained. In the bulk and stop-coannihilation regions of mSUGRA
parameter space (that are consistent with the measured dark matter abundance),
lepton flavor-violating (LFV) processes are accessible at MEG and future
experiments. However, the very high reheat temperature of the Universe needed
after inflation (of about 10^{12} GeV) leads to a severe gravitino problem,
which disfavors either thermal leptogenesis or neutralino dark matter.
Non-thermal leptogenesis in the preheating phase from SUSY flat directions
relaxes the gravitino problem by lowering the required reheat temperature. The
baryon asymmetry can then be explained while preserving neutralino dark matter,
and for the bulk or stop-coannihilation regions LFV processes should be
observed in current or future experiments.
| [
{
"created": "Mon, 14 Jun 2010 22:25:45 GMT",
"version": "v1"
}
] | 2010-11-15 | [
[
"Blanchet",
"Steve",
""
],
[
"Marfatia",
"Danny",
""
],
[
"Mustafayev",
"Azar",
""
]
] | Within a supersymmetric (SUSY) type-I seesaw framework with flavor-blind universal boundary conditions, we study the consequences of requiring that the observed baryon asymmetry of the Universe be explained by either thermal or non-thermal leptogenesis. In the former case, we find that the parameter space is very constrained. In the bulk and stop-coannihilation regions of mSUGRA parameter space (that are consistent with the measured dark matter abundance), lepton flavor-violating (LFV) processes are accessible at MEG and future experiments. However, the very high reheat temperature of the Universe needed after inflation (of about 10^{12} GeV) leads to a severe gravitino problem, which disfavors either thermal leptogenesis or neutralino dark matter. Non-thermal leptogenesis in the preheating phase from SUSY flat directions relaxes the gravitino problem by lowering the required reheat temperature. The baryon asymmetry can then be explained while preserving neutralino dark matter, and for the bulk or stop-coannihilation regions LFV processes should be observed in current or future experiments. |
0707.2944 | Francois Arleo | Francois Arleo, Thierry Gousset | Measuring gluon shadowing with prompt photons at RHIC and LHC | 14 pages, 6 figures. Typo corrected in Eq. (4) | Phys.Lett.B660:181-187,2008 | 10.1016/j.physletb.2007.12.025 | CERN-PH-TH/2007-103, LAPTH-1202/07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility to observe the nuclear modification of the gluon distribution
at small-x (gluon shadowing) using high-p_T prompt photon production at RHIC
and at LHC is discussed. The per-nucleon ratio, sigma(p+A -> gamma+X) / A
sigma(p+p -> gamma+X), is computed for both inclusive and isolated prompt
photons in perturbative QCD at NLO using different parametrizations of nuclear
parton densities, in order to assess the visibility of the shadowing signal.
The production of isolated photons turns out to be a promising channel which
allows for a reliable extraction of the gluon density, G^A/G^p, and the
structure function, F_2^A/F_2^p, in a nucleus over that in a proton. Moreover,
the production ratio of prompt photons at forward-over-backward rapidity in p-A
collisions provides an estimate of G^A/G^p (at small x) over F_2^A/F_2^p (at
large x), without the need of p-p reference data at the same energy.
| [
{
"created": "Thu, 19 Jul 2007 17:31:24 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Oct 2008 12:20:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Arleo",
"Francois",
""
],
[
"Gousset",
"Thierry",
""
]
] | The possibility to observe the nuclear modification of the gluon distribution at small-x (gluon shadowing) using high-p_T prompt photon production at RHIC and at LHC is discussed. The per-nucleon ratio, sigma(p+A -> gamma+X) / A sigma(p+p -> gamma+X), is computed for both inclusive and isolated prompt photons in perturbative QCD at NLO using different parametrizations of nuclear parton densities, in order to assess the visibility of the shadowing signal. The production of isolated photons turns out to be a promising channel which allows for a reliable extraction of the gluon density, G^A/G^p, and the structure function, F_2^A/F_2^p, in a nucleus over that in a proton. Moreover, the production ratio of prompt photons at forward-over-backward rapidity in p-A collisions provides an estimate of G^A/G^p (at small x) over F_2^A/F_2^p (at large x), without the need of p-p reference data at the same energy. |
2101.11874 | Zhen-Xing Zhao | Zhen-Xing Zhao, Xiao-Yu Sun, Fu-Wei Zhang, Zhi-Peng Xing | On the four-quark operator matrix elements for the lifetime of
$\Lambda_{b}$ | 13 pages, 4 figures; version accepted by EPJC | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Heavy quark expansion can nicely explain the lifetime of $\Lambda_{b}$.
However, there still exist sizable uncertainties from the four-quark operator
matrix elements of $\Lambda_{b}$ in $1/m_{b}^{3}$ corrections, which describe
the spectator effects. In this work, these four-quark operator matrix elements
are investigated using full QCD sum rules for the first time. At the QCD level,
contributions from up to dimension-6 four-quark operators are considered. Our
method of calculating high-dimensional operator matrix elements is promising to
be used to resolve the $\Omega_{c}$ lifetime puzzle.
| [
{
"created": "Thu, 28 Jan 2021 09:09:57 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jul 2023 17:47:37 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Dec 2023 05:03:59 GMT",
"version": "v3"
}
] | 2023-12-05 | [
[
"Zhao",
"Zhen-Xing",
""
],
[
"Sun",
"Xiao-Yu",
""
],
[
"Zhang",
"Fu-Wei",
""
],
[
"Xing",
"Zhi-Peng",
""
]
] | Heavy quark expansion can nicely explain the lifetime of $\Lambda_{b}$. However, there still exist sizable uncertainties from the four-quark operator matrix elements of $\Lambda_{b}$ in $1/m_{b}^{3}$ corrections, which describe the spectator effects. In this work, these four-quark operator matrix elements are investigated using full QCD sum rules for the first time. At the QCD level, contributions from up to dimension-6 four-quark operators are considered. Our method of calculating high-dimensional operator matrix elements is promising to be used to resolve the $\Omega_{c}$ lifetime puzzle. |
2211.00422 | Jean-Samuel Roux | James M. Cline, Benoit Laurent, Stuart Raby, Jean-Samuel Roux | PeV-scale leptogenesis, gravity waves and black holes from a
SUSY-breaking phase transition | 19 pages, 8 figures | null | 10.1103/PhysRevD.107.095011 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Supersymmetry is a highly motivated theoretical framework, whose scale of
breaking may be at PeV energies, to explain null searches at the Large Hadron
Collider. SUSY breaking through a first order phase transition may have
occurred in the early universe, leading to potential gravitational wave
signals. Constructing a realistic model for gauge-mediated supersymmetry
breaking, we show that such a transition can also induce masses for heavy
right-handed neutrinos and sneutrinos, whose CP-violating decays give
leptogenesis at the PeV scale, and a novel mechanism of neutrino mass
generation at one loop. For the same models we predict the possible gravity
wave signals, and we study the possibility of production of primordial black
holes during the phase transition.
| [
{
"created": "Tue, 1 Nov 2022 12:32:27 GMT",
"version": "v1"
}
] | 2023-05-17 | [
[
"Cline",
"James M.",
""
],
[
"Laurent",
"Benoit",
""
],
[
"Raby",
"Stuart",
""
],
[
"Roux",
"Jean-Samuel",
""
]
] | Supersymmetry is a highly motivated theoretical framework, whose scale of breaking may be at PeV energies, to explain null searches at the Large Hadron Collider. SUSY breaking through a first order phase transition may have occurred in the early universe, leading to potential gravitational wave signals. Constructing a realistic model for gauge-mediated supersymmetry breaking, we show that such a transition can also induce masses for heavy right-handed neutrinos and sneutrinos, whose CP-violating decays give leptogenesis at the PeV scale, and a novel mechanism of neutrino mass generation at one loop. For the same models we predict the possible gravity wave signals, and we study the possibility of production of primordial black holes during the phase transition. |
hep-ph/0405162 | Josip Trampetic Dr. | G. Duplancic, H. Pasagic, J. Trampetic | Rare $\Omega^{-} \to \Xi(1530)^{0} \pi^-$ decay in the Skyrme model | 4 pages, version to appear in Phys. Rev. D | Phys.Rev. D70 (2004) 077506 | 10.1103/PhysRevD.70.077506 | null | hep-ph | null | Rare nonleptonic $\Omega^{-} \to \Xi(1530)^{0} \pi^-$ decay branching ratio
is estimated by means of the QCD enhanced effective weak Hamiltonian
supplemented by the SU(3) Skyrme model used to estimate the nonperturbative
matrix elements. The whole scheme is equivalent to that which works well for
the nonleptonic hyperon and $\Omega^{-}$ decays. The computed rate is in a good
agreement with data.
| [
{
"created": "Tue, 18 May 2004 09:26:48 GMT",
"version": "v1"
},
{
"created": "Fri, 21 May 2004 17:14:04 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Oct 2004 15:43:26 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Duplancic",
"G.",
""
],
[
"Pasagic",
"H.",
""
],
[
"Trampetic",
"J.",
""
]
] | Rare nonleptonic $\Omega^{-} \to \Xi(1530)^{0} \pi^-$ decay branching ratio is estimated by means of the QCD enhanced effective weak Hamiltonian supplemented by the SU(3) Skyrme model used to estimate the nonperturbative matrix elements. The whole scheme is equivalent to that which works well for the nonleptonic hyperon and $\Omega^{-}$ decays. The computed rate is in a good agreement with data. |
0812.0524 | Sven Heinemeyer | S. Heinemeyer, A. Nikitenko, G. Weiglein | Charged MSSM Higgs Bosons at CMS: Reach and Parameter Dependence | 6 pages, 3 figures. Talk given at the "cHarged 2008", Uppsala,
Sweden, September 2008 | null | null | DCPT/08/178, IPPP/08/89 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the analysis of the 5 sigma discovery contours for the charged MSSM
Higgs boson at the CMS experiment with 30 fb^-1 for the two cases M_H+ < m_t
and M_H+ > m_t. Latest results for the CMS experimental sensitivities based on
full simulation studies are combined with state-of-the-art theoretical
predictions of MSSM Higgs-boson production and decay properties. Special focus
is put on the SUSY parameter dependence of the 5 sigma contours. The variation
of mu can shift the prospective discovery reach in tan_beta by up to Delta
tan_beta = 40. We furthermore discuss various theory uncertainties on the
signal cross section and branching ratio calculations. In order to arrive at a
reliable interpretation of a signal of the charged MSSM Higgs boson at the LHC
a strong reduction in the relevant theory uncertainties will be necessary.
| [
{
"created": "Tue, 2 Dec 2008 15:04:26 GMT",
"version": "v1"
}
] | 2008-12-03 | [
[
"Heinemeyer",
"S.",
""
],
[
"Nikitenko",
"A.",
""
],
[
"Weiglein",
"G.",
""
]
] | We review the analysis of the 5 sigma discovery contours for the charged MSSM Higgs boson at the CMS experiment with 30 fb^-1 for the two cases M_H+ < m_t and M_H+ > m_t. Latest results for the CMS experimental sensitivities based on full simulation studies are combined with state-of-the-art theoretical predictions of MSSM Higgs-boson production and decay properties. Special focus is put on the SUSY parameter dependence of the 5 sigma contours. The variation of mu can shift the prospective discovery reach in tan_beta by up to Delta tan_beta = 40. We furthermore discuss various theory uncertainties on the signal cross section and branching ratio calculations. In order to arrive at a reliable interpretation of a signal of the charged MSSM Higgs boson at the LHC a strong reduction in the relevant theory uncertainties will be necessary. |
1504.06643 | Mathias Garny | Mathias Garny, Urko Reinosa | Renormalization out of equilibrium in a superrenormalizable theory | 5 pages, 2 figures | Phys. Rev. D 94, 045012 (2016) | 10.1103/PhysRevD.94.045012 | CERN-PH-TH-2015-095, CPHT-RR014.0415 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the renormalization of the initial value problem in Nonequilibrium
Quantum Field Theory within a simple, yet instructive, example and show how to
obtain a renormalized time evolution for the two-point functions of a scalar
field and its conjugate momentum at all times. The scheme we propose is
applicable to systems that are initially far from equilibrium and compatible
with non-secular approximation schemes which capture thermalization. It is
based on Kadanoff-Baym equations for non-Gaussian initial states, complemented
by usual vacuum counterterms. We explicitly demonstrate how various
cutoff-dependent effects peculiar to nonequilibrium systems, including
time-dependent divergences or initial-time singularities, are avoided by taking
an initial non-Gaussian three-point vacuum correlation into account.
| [
{
"created": "Fri, 24 Apr 2015 21:05:00 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Garny",
"Mathias",
""
],
[
"Reinosa",
"Urko",
""
]
] | We discuss the renormalization of the initial value problem in Nonequilibrium Quantum Field Theory within a simple, yet instructive, example and show how to obtain a renormalized time evolution for the two-point functions of a scalar field and its conjugate momentum at all times. The scheme we propose is applicable to systems that are initially far from equilibrium and compatible with non-secular approximation schemes which capture thermalization. It is based on Kadanoff-Baym equations for non-Gaussian initial states, complemented by usual vacuum counterterms. We explicitly demonstrate how various cutoff-dependent effects peculiar to nonequilibrium systems, including time-dependent divergences or initial-time singularities, are avoided by taking an initial non-Gaussian three-point vacuum correlation into account. |
hep-ph/9206231 | Ernest Ma | Ernest Ma | Accidental Approximate Generation Universality and its Possible
Verification | 6 pages (2 figures, not included) | Proc. of Beyond the Standard Model III, p.485 (1993) | null | UCRHEP-T93 (June 1992) | hep-ph | null | The universality of $e-\mu-\tau$ interactions may only be an accidental
approximate symmetry analogous to that of flavor SU(2) and SU(3). This was
specifically realized by an extension of the standard model proposed in 1981.
Two key predictions are that the $\tau$ lifetime should be longer and that the
$\rho$ parameter measured at the Z peak should have an additional negative
contribution. These are consistent with present precision electroweak
measurements. A future decisive test of this model would be the discovery of
new W and Z bosons with nearly degenerate masses of a few TeV.
| [
{
"created": "Wed, 17 Jun 1992 20:26:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ma",
"Ernest",
""
]
] | The universality of $e-\mu-\tau$ interactions may only be an accidental approximate symmetry analogous to that of flavor SU(2) and SU(3). This was specifically realized by an extension of the standard model proposed in 1981. Two key predictions are that the $\tau$ lifetime should be longer and that the $\rho$ parameter measured at the Z peak should have an additional negative contribution. These are consistent with present precision electroweak measurements. A future decisive test of this model would be the discovery of new W and Z bosons with nearly degenerate masses of a few TeV. |
1707.00988 | Stefan de Boer | Stefan de Boer | Two loop virtual corrections to $b\to(d,s)\ell^+\ell^-$ and $c\to
u\ell^+\ell^-$ for arbitrary momentum transfer | 14 pages plus references and appendix. The results are supplemented
to the source files of this paper; v2: typos corrected and clarifications and
references added, supplemented files (+ analytical results in terms of GPLs)
and description thereof improved, results unchanged; v3: files and text
(fitted results for negative momentum transfer and factorizable results)
added, results unchanged | null | 10.1140/epjc/s10052-017-5364-x | DO-TH 17/06, QFET-2017-14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-factorizable two loop corrections to heavy to light flavor changing
neutral current transitions due to matrix elements of current-current operators
are calculated analytically for arbitrary momentum transfer. This extends
previous works on $b\to(d,s)\ell^+\ell^-$ transitions. New results for $c\to
u\ell^+\ell^-$ transitions are presented. Recent works on polylogarithms are
used for the master integrals. For $b\to s\ell^+\ell^-$ transitions, the
corrections are most significant for the imaginary parts of the effective
Wilson coefficients in the large hadronic recoil range. Analytical results and
ready-to-use fitted results for a specific set of parameters are provided.
| [
{
"created": "Tue, 4 Jul 2017 13:47:47 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Nov 2017 14:50:14 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Jan 2019 16:54:34 GMT",
"version": "v3"
}
] | 2019-01-24 | [
[
"de Boer",
"Stefan",
""
]
] | Non-factorizable two loop corrections to heavy to light flavor changing neutral current transitions due to matrix elements of current-current operators are calculated analytically for arbitrary momentum transfer. This extends previous works on $b\to(d,s)\ell^+\ell^-$ transitions. New results for $c\to u\ell^+\ell^-$ transitions are presented. Recent works on polylogarithms are used for the master integrals. For $b\to s\ell^+\ell^-$ transitions, the corrections are most significant for the imaginary parts of the effective Wilson coefficients in the large hadronic recoil range. Analytical results and ready-to-use fitted results for a specific set of parameters are provided. |
hep-ph/0112047 | Marek Karliner | Marek Karliner (Tel-Aviv U.) | Towards the resolution of the e+e- --> Nbar N puzzle | Invited talk at the Int. Workshop "Light-cone Physics: Particles and
Strings", Trento, Sept. 3-11, 2001 | Nucl.Phys.Proc.Suppl. 108 (2002) 84-90 | 10.1016/S0920-5632(02)01309-9 | TAUP-2693-01 | hep-ph | null | We discuss the puzzling experimental results on baryon-antibaryon production
in e+e- annihilation close to the threshold, in particular the fact that
sigma(e+e- --> nbar n) is somewhat greater than sigma(e+e- --> pbar p). We
discuss an interpretation in terms of a two-step process, via an intermediate
coherent isovector state serving as an intermediary between e+e- and the
baryon-antibaryon system. We provide evidence that the isovector channel
dominates both e+e- --> pions and from Nbar N annihilation at rest, and show
that the observed ratio of sigma(e+e- --> nbar n)/sigma(e+e- --> pbar p) can be
understood quantitatively in this picture.
| [
{
"created": "Tue, 4 Dec 2001 11:26:41 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Karliner",
"Marek",
"",
"Tel-Aviv U."
]
] | We discuss the puzzling experimental results on baryon-antibaryon production in e+e- annihilation close to the threshold, in particular the fact that sigma(e+e- --> nbar n) is somewhat greater than sigma(e+e- --> pbar p). We discuss an interpretation in terms of a two-step process, via an intermediate coherent isovector state serving as an intermediary between e+e- and the baryon-antibaryon system. We provide evidence that the isovector channel dominates both e+e- --> pions and from Nbar N annihilation at rest, and show that the observed ratio of sigma(e+e- --> nbar n)/sigma(e+e- --> pbar p) can be understood quantitatively in this picture. |
1902.08212 | Abhishek Banerjee | Abhishek Banerjee, Dmitry Budker, Joshua Eby, Hyungjin Kim, and Gilad
Perez | Relaxion Stars and their detection via Atomic Physics | 17 pages, 6 figures; v2: minor revisions, matches published version | Commun Phys 3, 1 (2020) | 10.1038/s42005-019-0260-3 | null | hep-ph astro-ph.CO physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological relaxion can address the hierarchy problem, while its
coherent oscillations can constitute dark matter in the present universe. We
consider the possibility that the relaxion forms gravitationally bound objects
that we denote as relaxion stars. The density of these stars would be higher
than that of the local dark matter density, resulting in enhanced signals in
table-top detectors, among others. Furthermore, we raise the possibility that
these objects may be trapped by an external gravitational potential, such as
that of the Earth or the Sun. This leads to formation of relaxion halos of even
greater density. We discuss several interesting implications of relaxion halos,
as well as detection strategies to probe them.
| [
{
"created": "Thu, 21 Feb 2019 19:00:06 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Nov 2019 11:46:14 GMT",
"version": "v2"
}
] | 2020-01-14 | [
[
"Banerjee",
"Abhishek",
""
],
[
"Budker",
"Dmitry",
""
],
[
"Eby",
"Joshua",
""
],
[
"Kim",
"Hyungjin",
""
],
[
"Perez",
"Gilad",
""
]
] | The cosmological relaxion can address the hierarchy problem, while its coherent oscillations can constitute dark matter in the present universe. We consider the possibility that the relaxion forms gravitationally bound objects that we denote as relaxion stars. The density of these stars would be higher than that of the local dark matter density, resulting in enhanced signals in table-top detectors, among others. Furthermore, we raise the possibility that these objects may be trapped by an external gravitational potential, such as that of the Earth or the Sun. This leads to formation of relaxion halos of even greater density. We discuss several interesting implications of relaxion halos, as well as detection strategies to probe them. |
1210.3439 | Jeonghyeon Song | Sanghyeon Chang, Sin Kyu Kang, Jong-Phil Lee, Kang Young Lee, Seong
Chan Park, Jeonghyeon Song | Comprehensive study of two Higgs doublet model in light of the new boson
with mass around 125 GeV | References are added with 18 pages, 2 figures, 4 tables | null | 10.1007/JHEP05(2013)075 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent discovery of a new boson of mass roughly 125 GeV has been reported
by the ATLAS and CMS collaborations. Although its signals in various decay
modes resemble those of the standard model (SM) Higgs boson, observed are the
combinations of entangled information about the production, decay rates and
total decay width of the new boson. In addition, some decay channels show
non-negligible deviation from the SM expectation, such as the $2\sigma$ excess
in the diphoton channel. In the four types (I, II, X and Y) of two Higgs
doublet models, we perform the global $\chi^2$ fit in three scenarios: (i) the
new boson is the light CP-even Higgs boson $h^0$; (ii) it is the heavy CP-even
Higgs boson $H^0$; (iii) the signals are from degenerate $h^0$ and the
pseudoscalar $A^0$. Considering other phenomenological constraints such as
flavor physics, electroweak precision data, and the LEP search for the Higgs
boson, we find that the the first scenarios in Type II and Type Y models
actually provide better or similarly good fit to the data than the SM. All the
other models are excluded at 95% C.L..
| [
{
"created": "Fri, 12 Oct 2012 06:45:19 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2012 09:11:53 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Chang",
"Sanghyeon",
""
],
[
"Kang",
"Sin Kyu",
""
],
[
"Lee",
"Jong-Phil",
""
],
[
"Lee",
"Kang Young",
""
],
[
"Park",
"Seong Chan",
""
],
[
"Song",
"Jeonghyeon",
""
]
] | The recent discovery of a new boson of mass roughly 125 GeV has been reported by the ATLAS and CMS collaborations. Although its signals in various decay modes resemble those of the standard model (SM) Higgs boson, observed are the combinations of entangled information about the production, decay rates and total decay width of the new boson. In addition, some decay channels show non-negligible deviation from the SM expectation, such as the $2\sigma$ excess in the diphoton channel. In the four types (I, II, X and Y) of two Higgs doublet models, we perform the global $\chi^2$ fit in three scenarios: (i) the new boson is the light CP-even Higgs boson $h^0$; (ii) it is the heavy CP-even Higgs boson $H^0$; (iii) the signals are from degenerate $h^0$ and the pseudoscalar $A^0$. Considering other phenomenological constraints such as flavor physics, electroweak precision data, and the LEP search for the Higgs boson, we find that the the first scenarios in Type II and Type Y models actually provide better or similarly good fit to the data than the SM. All the other models are excluded at 95% C.L.. |
1504.02729 | Shun Zhou | Shun Zhou | Supernova Bounds on keV-mass Sterile Neutrinos | 10 pages, 2 figures, to be published in the Proceedings of
International Conference on Massive Neutrinos, Singapore, February 9-13,
2015. arXiv admin note: text overlap with arXiv:1109.3187 | null | 10.1142/S0217751X15300331 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sterile neutrinos of keV masses are one of the most promising candidates for
the warm dark matter, which could solve the small-scale problems encountered in
the scenario of cold dark matter. We present a detailed study of the production
of such sterile neutrinos in a supernova core, and derive stringent bounds on
the active-sterile neutrino mixing angles and sterile neutrino masses based on
the standard energy-loss argument.
| [
{
"created": "Fri, 10 Apr 2015 16:12:15 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Zhou",
"Shun",
""
]
] | Sterile neutrinos of keV masses are one of the most promising candidates for the warm dark matter, which could solve the small-scale problems encountered in the scenario of cold dark matter. We present a detailed study of the production of such sterile neutrinos in a supernova core, and derive stringent bounds on the active-sterile neutrino mixing angles and sterile neutrino masses based on the standard energy-loss argument. |
hep-ph/9805359 | Sergio Lupia | Sergio Lupia (Max-Planck-Inst. fuer Physik, Munich) | QCD description of high order factorial moments in quark and gluon jets | LaTeX, 3 pages, to appear in Proc. of XXXIIIrd Rencontres de Moriond,
`QCD and high energy interactions'', Les Arcs, France, March 21-28, 1998 | null | null | MPI-PhT/98-37 | hep-ph | null | The complete QCD evolution equation for factorial moments in quark and gluon
jets is numerically solved with initial conditions at threshold by fully taking
into account the energy-momentum conservation law. Within the picture of Local
Parton Hadron Duality, the perturbative QCD predictions can successfully
describe the available experimental data.
| [
{
"created": "Mon, 18 May 1998 13:57:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lupia",
"Sergio",
"",
"Max-Planck-Inst. fuer Physik, Munich"
]
] | The complete QCD evolution equation for factorial moments in quark and gluon jets is numerically solved with initial conditions at threshold by fully taking into account the energy-momentum conservation law. Within the picture of Local Parton Hadron Duality, the perturbative QCD predictions can successfully describe the available experimental data. |
hep-ph/0412241 | Matthias Neubert | Matthias Neubert (Cornell University & IAS, Princeton) | Two-Loop Relations for Heavy-Quark Parameters in the Shape-Function
Scheme | 10 pages, 1 figure. Two-loop shape-function anomalous dimension
corrected; minor numerical changes. Version to appear in Physics Letters B | Phys.Lett. B612 (2005) 13-20 | 10.1016/j.physletb.2005.02.055 | CLNS-04/1903 | hep-ph | null | Moments of the renormalized B-meson shape function provide a natural way to
define short-distance, running heavy-quark parameters such as the b-quark mass
and kinetic energy. These parameters are particularly well suited for studies
of inclusive decay distributions. The definitions of m_b and mu_pi^2 in this
``shape-function scheme'' are derived to two-loop order. Using previous
determinations of heavy-quark parameters in other schemes, we find
m_b=(4.63+-0.08) GeV and mu_\pi^2=(0.15+-0.07) GeV^2 at a reference scale of
1.5 GeV.
| [
{
"created": "Thu, 16 Dec 2004 21:03:30 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2005 20:58:08 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Neubert",
"Matthias",
"",
"Cornell University & IAS, Princeton"
]
] | Moments of the renormalized B-meson shape function provide a natural way to define short-distance, running heavy-quark parameters such as the b-quark mass and kinetic energy. These parameters are particularly well suited for studies of inclusive decay distributions. The definitions of m_b and mu_pi^2 in this ``shape-function scheme'' are derived to two-loop order. Using previous determinations of heavy-quark parameters in other schemes, we find m_b=(4.63+-0.08) GeV and mu_\pi^2=(0.15+-0.07) GeV^2 at a reference scale of 1.5 GeV. |
0712.1711 | D. P. Roy | M. Hirsch, D. P. Roy and J. W. F. Valle | Probing a Supersymmetric Model for Neutrino Masses at Ultrahigh Energy
Neutrino Telescopes | 11 pages pdf including 2 figures. Discussion added. Final version to
appear in Physics Letters B | Phys.Lett.B662:185-189,2008 | 10.1016/j.physletb.2008.02.065 | IFIC/07-76 | hep-ph | null | A bilinear R-Parity breaking SUSY model for neutrino mass and mixing predicts
the lightest superparticle to decay mainly into a pair of tau leptons or b
quarks along with a neutrino for relatively light SUSY spectra. This leads to a
distinctive triple bang signature of SUSY events at ultrahigh energy neutrino
telescopes like IceCube or Antares. While the expected signal size is only
marginal at IceCube, it will be promising for a future multi-km^3 size neutrino
telescope.
| [
{
"created": "Tue, 11 Dec 2007 13:47:13 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Feb 2008 16:17:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hirsch",
"M.",
""
],
[
"Roy",
"D. P.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | A bilinear R-Parity breaking SUSY model for neutrino mass and mixing predicts the lightest superparticle to decay mainly into a pair of tau leptons or b quarks along with a neutrino for relatively light SUSY spectra. This leads to a distinctive triple bang signature of SUSY events at ultrahigh energy neutrino telescopes like IceCube or Antares. While the expected signal size is only marginal at IceCube, it will be promising for a future multi-km^3 size neutrino telescope. |
0901.3673 | Leonid Slad | L.M. Slad | Electromagnetic form factors and polarizations of non-Dirac particles
with rest spin 1/2 | 14 pages, no figures | Theor.Math.Phys.158:112-124,2009; Teor.Mat.Fiz.158:135-149,2009 | 10.1007/s11232-009-0009-3 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider one aspect of the theoretical foundations of polarization
experiments on elastic scattering of electrons on protons yielding form factor
ratios incompatible with those that are extracted from nonpolarization
experiments. We analyze the consequences of abandoning the assumption that the
nucleon is a Dirac particle. We show that the process of elastic scattering of
electrons on nucleons is described by the same formulas, irrespective of the
proper Lorentz group representation associated with the nucleon as a particle
with the rest spin 1/2.
| [
{
"created": "Fri, 23 Jan 2009 14:03:27 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Slad",
"L. M.",
""
]
] | We consider one aspect of the theoretical foundations of polarization experiments on elastic scattering of electrons on protons yielding form factor ratios incompatible with those that are extracted from nonpolarization experiments. We analyze the consequences of abandoning the assumption that the nucleon is a Dirac particle. We show that the process of elastic scattering of electrons on nucleons is described by the same formulas, irrespective of the proper Lorentz group representation associated with the nucleon as a particle with the rest spin 1/2. |
hep-ph/0312279 | O. Nachtmann | Otto Nachtmann | Pomeron Physics and QCD | 15 pages, Contribution to the Ringberg Workshop on HERA Physics 2003 | null | 10.1142/9789812702722_0023 | HD-THEP-03-63 | hep-ph | null | We review some theoretical ideas concerning diffractive processes. We discuss
the Regge Ansatz for the pomeron and the two pomeron model. Then we present the
results obtained from nonperturbative QCD for high energy scattering. There we
can extract from elastic scattering data the parameters describing the QCD
vacuum, in particular the string tension.
| [
{
"created": "Fri, 19 Dec 2003 14:21:19 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Nachtmann",
"Otto",
""
]
] | We review some theoretical ideas concerning diffractive processes. We discuss the Regge Ansatz for the pomeron and the two pomeron model. Then we present the results obtained from nonperturbative QCD for high energy scattering. There we can extract from elastic scattering data the parameters describing the QCD vacuum, in particular the string tension. |
1507.04281 | Howard E. Haber | Howard E. Haber and Oscar Stal | New LHC Benchmarks for the CP-conserving Two-Higgs-Doublet Model | 38 pages, 16 figures, 11 tables. Typographical errors corrected, a
clarifying remark added to the caption of Fig. 2, and two references updated
in Version 4 | Eur.Phys. J. C75 (2015) 491 | 10.1140/epjc/s10052-015-3697-x | SCIPP-15/10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a strategy to study the parameter space of the general,
CP-conserving, two-Higgs-doublet Model (2HDM) with a softly broken Z_2-symmetry
by means of a new "hybrid" basis. In this basis the input parameters are the
measured values of the mass of the observed Standard Model (SM)-like Higgs
boson and its coupling strength to vector boson pairs, the mass of the second
CP-even Higgs boson, the ratio of neutral Higgs vacuum expectation values, and
three additional dimensionless parameters. Using the hybrid basis, we present
numerical scans of the 2HDM parameter space where we survey available parameter
regions and analyze model constraints. From these results, we define a number
of benchmark scenarios that capture different aspects of non-standard Higgs
phenomenology that are of interest for future LHC Higgs searches.
| [
{
"created": "Wed, 15 Jul 2015 16:23:15 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2015 03:59:04 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Aug 2015 16:53:52 GMT",
"version": "v3"
},
{
"created": "Tue, 17 May 2016 06:06:24 GMT",
"version": "v4"
}
] | 2016-05-18 | [
[
"Haber",
"Howard E.",
""
],
[
"Stal",
"Oscar",
""
]
] | We introduce a strategy to study the parameter space of the general, CP-conserving, two-Higgs-doublet Model (2HDM) with a softly broken Z_2-symmetry by means of a new "hybrid" basis. In this basis the input parameters are the measured values of the mass of the observed Standard Model (SM)-like Higgs boson and its coupling strength to vector boson pairs, the mass of the second CP-even Higgs boson, the ratio of neutral Higgs vacuum expectation values, and three additional dimensionless parameters. Using the hybrid basis, we present numerical scans of the 2HDM parameter space where we survey available parameter regions and analyze model constraints. From these results, we define a number of benchmark scenarios that capture different aspects of non-standard Higgs phenomenology that are of interest for future LHC Higgs searches. |
1309.4447 | John Kearney | John Kearney and Aaron Pierce | Dark Sector Mass Relations from RG Focusing | 10 pages, 7 figures; v2: LHC projections in figure 1 slightly
modified, conclusions unchanged | Phys. Rev. D 88, 095009 (2013) | 10.1103/PhysRevD.88.095009 | MCTP-13-26 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark sector mass relations, such as those which permit near-threshold or
near-resonance annihilation in the early universe, could arise due to
IR-attractive ratios in renormalization group equations. Achieving a particular
ratio requires specific dark matter gauge charges or interactions, leading to
predictions about the dark matter properties. Furthermore, additional states
with masses comparable to the dark matter mass may be necessary, potentially
giving rise to novel phenomenology. We explore this idea in the context of dark
matter charged under a new gauged $U(1)_X$ that kinetically mixes with the
Standard Model hypercharge.
| [
{
"created": "Tue, 17 Sep 2013 20:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Nov 2013 20:54:36 GMT",
"version": "v2"
}
] | 2013-11-20 | [
[
"Kearney",
"John",
""
],
[
"Pierce",
"Aaron",
""
]
] | Dark sector mass relations, such as those which permit near-threshold or near-resonance annihilation in the early universe, could arise due to IR-attractive ratios in renormalization group equations. Achieving a particular ratio requires specific dark matter gauge charges or interactions, leading to predictions about the dark matter properties. Furthermore, additional states with masses comparable to the dark matter mass may be necessary, potentially giving rise to novel phenomenology. We explore this idea in the context of dark matter charged under a new gauged $U(1)_X$ that kinetically mixes with the Standard Model hypercharge. |
2212.12227 | Xu Li | Xu Li | Positivity bounds at one-loop level: the Higgs sector | 23 papers, 3 figures | null | 10.1007/JHEP05(2023)230 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we promote the convex cone method of positive bounds from tree
level to loop level. This method is general and can be applied to obtain
leading $s^2$ positivity bounds on the forward scattering process in the
standard model effective field theory. To obtain the loop level bounds, the
original tree level bounds are modified by loop corrections, which involve low
dimensional coefficients. New positivity bounds being valid at one loop level
on the four-Higgs scattering have been provided. We study some specific
ultraviolet models to check the validity of the new bounds. In addition, the
renormalisation group effect on positivity is explored. We point out that as
long as the new bounds are satisfied at the cutoff scale $\Lambda$, they will
also be satisfied at all scales.
| [
{
"created": "Fri, 23 Dec 2022 09:42:50 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2023 03:02:50 GMT",
"version": "v2"
}
] | 2023-06-14 | [
[
"Li",
"Xu",
""
]
] | In this paper, we promote the convex cone method of positive bounds from tree level to loop level. This method is general and can be applied to obtain leading $s^2$ positivity bounds on the forward scattering process in the standard model effective field theory. To obtain the loop level bounds, the original tree level bounds are modified by loop corrections, which involve low dimensional coefficients. New positivity bounds being valid at one loop level on the four-Higgs scattering have been provided. We study some specific ultraviolet models to check the validity of the new bounds. In addition, the renormalisation group effect on positivity is explored. We point out that as long as the new bounds are satisfied at the cutoff scale $\Lambda$, they will also be satisfied at all scales. |
0806.4386 | Ernest Ma | Ernest Ma (UC Riverside) | Axionic Extensions of the Supersymmetric Standard Model | 12 pages, 1 figure | null | 10.1142/S0217732309030837 | UCRHEP-T452 (June 2008) | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Supersymmetric Standard Model is a benchmark theoretical framework for
particle physics, yet it suffers from a number of deficiencies, chief among
which is the strong CP problem. Solving this with an axion in the context of
selected new particles, it is shown in three examples that other problems go
away automatically as well, resulting in (-)^L and (-)^{3B} conservation,
viable combination of two dark-matter candidates, successful baryogenesis,
seesaw neutrino masses, and verifiable experimental consequences at the TeV
energy scale.
| [
{
"created": "Thu, 26 Jun 2008 20:07:45 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | The Supersymmetric Standard Model is a benchmark theoretical framework for particle physics, yet it suffers from a number of deficiencies, chief among which is the strong CP problem. Solving this with an axion in the context of selected new particles, it is shown in three examples that other problems go away automatically as well, resulting in (-)^L and (-)^{3B} conservation, viable combination of two dark-matter candidates, successful baryogenesis, seesaw neutrino masses, and verifiable experimental consequences at the TeV energy scale. |
1302.3710 | Thorsten Renk | Thorsten Renk | The Physics probed by the P_T Dependence of the Nuclear Suppression
Factor | 7 pages, 4 figures | null | 10.1103/PhysRevC.88.014905 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nuclear suppression factor R_AA of single inclusive hadrons measured in
ultrarelativistic heavy-ion collisions was the first observable to study jet
quenching, i.e. the final state interaction of hard parton showers with the
surrounding bulk matter. While its transverse momentum (P_T) dependence of R_AA
observed at RHIC was weak and hence never decisive in constraining models,
there is now a strong and non-trivial P_T dependence observed at the LHC. This
has been a challenge for several models which worked well at RHIC kinematics.
However, in more general terms it is also of importance to understand what
physical properties of the hard process and the parton-medium interaction are
reflected in R_AA(P_T). The results of the work presented here suggest that the
two main effects underlying the P_T dependence are the Quantum-Chromodynamics
scale evolution of the fragmentation function and the limited distance (set by
the typical medium length scale) for which a shower evolves in the medium.
| [
{
"created": "Fri, 15 Feb 2013 09:55:08 GMT",
"version": "v1"
}
] | 2013-08-09 | [
[
"Renk",
"Thorsten",
""
]
] | The nuclear suppression factor R_AA of single inclusive hadrons measured in ultrarelativistic heavy-ion collisions was the first observable to study jet quenching, i.e. the final state interaction of hard parton showers with the surrounding bulk matter. While its transverse momentum (P_T) dependence of R_AA observed at RHIC was weak and hence never decisive in constraining models, there is now a strong and non-trivial P_T dependence observed at the LHC. This has been a challenge for several models which worked well at RHIC kinematics. However, in more general terms it is also of importance to understand what physical properties of the hard process and the parton-medium interaction are reflected in R_AA(P_T). The results of the work presented here suggest that the two main effects underlying the P_T dependence are the Quantum-Chromodynamics scale evolution of the fragmentation function and the limited distance (set by the typical medium length scale) for which a shower evolves in the medium. |
hep-ph/0108113 | Matthew Martin | Daniel Boyanovsky, Hector J. de Vega, Richard Holman, Matthew R.
Martin | Non-Equilibrium Large N Yukawa Dynamics: marching through the Landau
pole | 36 pages, 14 figures, LaTeX, submitted to Physical Review D | Phys.Rev.D65:045007,2002 | 10.1103/PhysRevD.65.045007 | null | hep-ph astro-ph hep-th | null | The non-equilibrium dynamics of a Yukawa theory with N fermions coupled to a
scalar field is studied in the large N limit with the goal of comparing the
dynamics predicted from the renormalization group improved effective potential
to that obtained including the fermionic backreaction. The effective potential
is of the Coleman-Weinberg type. Its renormalization group improvement is
unbounded from below and features a Landau pole. When viewed self-consistently,
the initial time singularity does not arise. The different regimes of the
dynamics of the fully renormalized theory are studied both analytically and
numerically. Despite the existence of a Landau pole in the model, the dynamics
of the mean field is smooth as it passes the location of the pole. This is a
consequence of a remarkable cancellation between the effective potential and
the dynamical chiral condensate. The asymptotic evolution is effectively
described by a quartic upright effective potential. In all regimes, profuse
particle production results in the formation of a dense fermionic plasma with
occupation numbers nearly saturated up to a scale of the order of the mean
field. This can be interpreted as a chemical potential. We discuss the
implications of these results for cosmological preheating.
| [
{
"created": "Mon, 13 Aug 2001 20:09:58 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Boyanovsky",
"Daniel",
""
],
[
"de Vega",
"Hector J.",
""
],
[
"Holman",
"Richard",
""
],
[
"Martin",
"Matthew R.",
""
]
] | The non-equilibrium dynamics of a Yukawa theory with N fermions coupled to a scalar field is studied in the large N limit with the goal of comparing the dynamics predicted from the renormalization group improved effective potential to that obtained including the fermionic backreaction. The effective potential is of the Coleman-Weinberg type. Its renormalization group improvement is unbounded from below and features a Landau pole. When viewed self-consistently, the initial time singularity does not arise. The different regimes of the dynamics of the fully renormalized theory are studied both analytically and numerically. Despite the existence of a Landau pole in the model, the dynamics of the mean field is smooth as it passes the location of the pole. This is a consequence of a remarkable cancellation between the effective potential and the dynamical chiral condensate. The asymptotic evolution is effectively described by a quartic upright effective potential. In all regimes, profuse particle production results in the formation of a dense fermionic plasma with occupation numbers nearly saturated up to a scale of the order of the mean field. This can be interpreted as a chemical potential. We discuss the implications of these results for cosmological preheating. |
hep-ph/0003087 | Pene | A. Le Yaouanc, D. Melikhov, V. Mor\'enas, L. Oliver, O. P\`ene, and
J.-C. Raynal | One Interesting New Sum Rule Extending Bjorken's to order {1/m_Q} | 9 pages | Phys.Lett. B480 (2000) 119-128 | 10.1016/S0370-2693(00)00383-X | LPT-ORSAY 00/27, HD-THEP-00-12, PCCF RI 0005 | hep-ph | null | We explicitly check quark-hadron duality to order $(m_b-m_c)\Lambda/m_b^2$
for $b \to c l\nu$ decays in the limit $m_b-m_c \ll m_b$ including ground state
and orbitally excited hadrons. Duality occurs thanks to a new sum rule which
expresses the subleading HQET form factor $\xi_3$ or, in other notations,
$a_+^{(1)}$ in terms of the infinite mass limit form factors and some level
splittings. We also demonstrate the sum rule, which is not restricted to the
condition $m_b-m_c \ll m_b$, applying OPE to the longitudinal axial component
of the hadronic tensor without neglecting the $1/m_b$ subleading contributions
to the form factors. We argue that this method should produce a new class of
sum rules, depending on the current, beyond Bjorken, Voloshin and the known
tower of higher moments. Applying OPE to the vector currents we find another
derivation of the Voloshin sum rule. From independent results on $\xi_3$ we
derive a sum rule which involves only the $\tau_{1/2}^{(n)}$ and
$\tau_{3/2}^{(n)}$ form factors and the corresponding level splittings. The
latter strongly supports a theoretical evidence that the $B$ semileptonic decay
into narrow orbitally-excited resonances dominates over the decay into the
broad ones, in apparent contradiction with some recent experiments. We discuss
this issue.
| [
{
"created": "Thu, 9 Mar 2000 18:18:06 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Yaouanc",
"A. Le",
""
],
[
"Melikhov",
"D.",
""
],
[
"Morénas",
"V.",
""
],
[
"Oliver",
"L.",
""
],
[
"Pène",
"O.",
""
],
[
"Raynal",
"J. -C.",
""
]
] | We explicitly check quark-hadron duality to order $(m_b-m_c)\Lambda/m_b^2$ for $b \to c l\nu$ decays in the limit $m_b-m_c \ll m_b$ including ground state and orbitally excited hadrons. Duality occurs thanks to a new sum rule which expresses the subleading HQET form factor $\xi_3$ or, in other notations, $a_+^{(1)}$ in terms of the infinite mass limit form factors and some level splittings. We also demonstrate the sum rule, which is not restricted to the condition $m_b-m_c \ll m_b$, applying OPE to the longitudinal axial component of the hadronic tensor without neglecting the $1/m_b$ subleading contributions to the form factors. We argue that this method should produce a new class of sum rules, depending on the current, beyond Bjorken, Voloshin and the known tower of higher moments. Applying OPE to the vector currents we find another derivation of the Voloshin sum rule. From independent results on $\xi_3$ we derive a sum rule which involves only the $\tau_{1/2}^{(n)}$ and $\tau_{3/2}^{(n)}$ form factors and the corresponding level splittings. The latter strongly supports a theoretical evidence that the $B$ semileptonic decay into narrow orbitally-excited resonances dominates over the decay into the broad ones, in apparent contradiction with some recent experiments. We discuss this issue. |
2402.11564 | Muhammad Ridwan | Muhammad Ridwan, Ahmad Jafar Arifi, and Terry Mart | The Properties of Radially Excited Charmonia in The Light Front Quark
Model | ITM Web Conf. Volume 61, 2024, The 9th International Symposium on
Current Progress in Mathematics and Sciences 2023 (The 9th ISCPMS 2023) in
conjunction with AUA Academic Conference on the Application of Artificial
Intelligences and Data Sciences in a Modern Science for a Better Life, 9
pages | ITM Web Conf. Volume 61, 2024 (9 pages) | 10.1051/itmconf/20246101016 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Investigating the properties of excited charmonia is important to clarify its
internal structure. In this paper, we present the mass spectra (MS) and decay
constants (DC) for charmonia up to 3S states calculated by means of the
light-front quark model based on a variational approach. In particular, we
consider the QCD-motivated effective Hamiltonian, which includes both
confinement (linear and screened) and Coulomb-like potentials. Furthermore,
since the existence of the nature of heavy quark symmetry, we treat hyperfine
interactions perturbatively. We developed the harmonic oscillator expansion
method to approximate the wave function (WF) for excited states. We found that
the results of our theoretical calculations, using screened potentials rather
than linear ones, are in good agreement with experimental data. By looking at
the mass and decay constant result, we found that our result on the {\psi}(3S)
state matched the properties of the {\psi}(4040) resonance.
| [
{
"created": "Sun, 18 Feb 2024 12:18:16 GMT",
"version": "v1"
}
] | 2024-03-20 | [
[
"Ridwan",
"Muhammad",
""
],
[
"Arifi",
"Ahmad Jafar",
""
],
[
"Mart",
"Terry",
""
]
] | Investigating the properties of excited charmonia is important to clarify its internal structure. In this paper, we present the mass spectra (MS) and decay constants (DC) for charmonia up to 3S states calculated by means of the light-front quark model based on a variational approach. In particular, we consider the QCD-motivated effective Hamiltonian, which includes both confinement (linear and screened) and Coulomb-like potentials. Furthermore, since the existence of the nature of heavy quark symmetry, we treat hyperfine interactions perturbatively. We developed the harmonic oscillator expansion method to approximate the wave function (WF) for excited states. We found that the results of our theoretical calculations, using screened potentials rather than linear ones, are in good agreement with experimental data. By looking at the mass and decay constant result, we found that our result on the {\psi}(3S) state matched the properties of the {\psi}(4040) resonance. |
hep-ph/9512261 | Murman Margvelashvili | Ketino Aladashvili, Murman Margvelashvili (HEPI, Tbilisi) | On the Flavor Dependence of the Mixed Quark-Gluon Condensate | 8 pages, latex, two figures in a separate uuencoded file. Submitted
to Phys.Lett.B | Phys.Lett. B372 (1996) 299-305 | 10.1016/0370-2693(96)00043-3 | TSU-HEPI 04-95 | hep-ph | null | The flavour dependence of the mixed quark-gluon condensate is studied through
the analysis of correlators of the hybrid current $a_{\mu}=g\bar
s\gamma_{\rho}\gamma_5 G_{\rho\mu}d$. The flavour symmetry breaking for this
type of condensates is found to be less than that for the quark condensates.
For the ratio of strange to nonstrange condensates we obtain \mbox{$R=0.95\pm
0.15$}. For the kaon coupling to the current $a_\mu$ we find
$\delta'^2=(0.020\pm0.005)GeV^2$, which is an order of magnitude smaller than
analogous chirally unsuppressed coupling.
| [
{
"created": "Fri, 8 Dec 1995 21:37:52 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Aladashvili",
"Ketino",
"",
"HEPI, Tbilisi"
],
[
"Margvelashvili",
"Murman",
"",
"HEPI, Tbilisi"
]
] | The flavour dependence of the mixed quark-gluon condensate is studied through the analysis of correlators of the hybrid current $a_{\mu}=g\bar s\gamma_{\rho}\gamma_5 G_{\rho\mu}d$. The flavour symmetry breaking for this type of condensates is found to be less than that for the quark condensates. For the ratio of strange to nonstrange condensates we obtain \mbox{$R=0.95\pm 0.15$}. For the kaon coupling to the current $a_\mu$ we find $\delta'^2=(0.020\pm0.005)GeV^2$, which is an order of magnitude smaller than analogous chirally unsuppressed coupling. |
hep-ph/0407244 | Sven Heinemeyer | S. Heinemeyer | MSSM Higgs Physics at Higher Orders | 119 pages, lots of figures. Version with full resolution figures can
be fount at http://quark.phy.bnl.gov/~heinemey/uni/paper/publ04.html | Int.J.Mod.Phys.A21:2659-2772,2006 | 10.1142/S0217751X06031028 | CERN-PH-TH/2004-139, LMU 09/04 | hep-ph | null | Various aspects of the Higgs boson phenomenology of the Minimal
Supersymmetric Standard Model (MSSM) are reviewed. Emphasis is put on the
effects of higher-order corrections. The masses and couplings are discussed in
the MSSM with real and complex parameters. Higher-order corrections to Higgs
boson production channels at a prospective e+ e- linear collider are
investigated. Corrections to Higgs boson decays to SM fermions and their
phenomenological implications for hadron and lepton colliders are explored.
| [
{
"created": "Wed, 21 Jul 2004 13:22:14 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Heinemeyer",
"S.",
""
]
] | Various aspects of the Higgs boson phenomenology of the Minimal Supersymmetric Standard Model (MSSM) are reviewed. Emphasis is put on the effects of higher-order corrections. The masses and couplings are discussed in the MSSM with real and complex parameters. Higher-order corrections to Higgs boson production channels at a prospective e+ e- linear collider are investigated. Corrections to Higgs boson decays to SM fermions and their phenomenological implications for hadron and lepton colliders are explored. |
hep-ph/0209158 | Yasunori Nomura | Walter D. Goldberger, Yasunori Nomura, David R. Smith | Warped Supersymmetric Grand Unification | 41 pages, LaTeX, version to appear in Phys. Rev. D | Phys.Rev.D67:075021,2003 | 10.1103/PhysRevD.67.075021 | UCB-PTH-02/38, LBNL-51481, MIT-CTP-3305 | hep-ph hep-th | null | We construct a realistic theory of grand unification in AdS_5 truncated by
branes, in which the unified gauge symmetry is broken by boundary conditions
and the electroweak scale is generated by the AdS warp factor. We show that the
theory preserves the successful gauge coupling unification of the 4D MSSM at
leading-logarithmic level. Kaluza-Klein (KK) towers, including those of XY
gauge and colored Higgs multiplets, appear at the TeV scale, while the extra
dimension provides natural mechanisms for doublet-triplet splitting and proton
decay suppression. In one possible scenario supersymmetry is strongly broken on
the TeV brane, in which case the lightest SU(3)_C x SU(2)_L x U(1)_Y gauginos
are approximately Dirac and the mass of the lightest XY gaugino is pushed well
below that of the lowest gauge boson KK mode, improving the prospects for its
production at the LHC. The bulk Lagrangian possesses a symmetry that we call
GUT parity. If GUT parity is exact, the lightest GUT particle, most likely an
XY gaugino, is stable. Once produced in a collider, the XY gaugino hadronizes
to form mesons, some of which will be charged and visible as highly ionizing
tracks. The lightest supersymmetric particle is the gravitino of mass \sim
10^{-3} eV, which is also stable if R parity is conserved.
| [
{
"created": "Mon, 16 Sep 2002 19:40:33 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Sep 2002 23:49:38 GMT",
"version": "v2"
},
{
"created": "Sat, 1 Mar 2003 00:16:40 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Goldberger",
"Walter D.",
""
],
[
"Nomura",
"Yasunori",
""
],
[
"Smith",
"David R.",
""
]
] | We construct a realistic theory of grand unification in AdS_5 truncated by branes, in which the unified gauge symmetry is broken by boundary conditions and the electroweak scale is generated by the AdS warp factor. We show that the theory preserves the successful gauge coupling unification of the 4D MSSM at leading-logarithmic level. Kaluza-Klein (KK) towers, including those of XY gauge and colored Higgs multiplets, appear at the TeV scale, while the extra dimension provides natural mechanisms for doublet-triplet splitting and proton decay suppression. In one possible scenario supersymmetry is strongly broken on the TeV brane, in which case the lightest SU(3)_C x SU(2)_L x U(1)_Y gauginos are approximately Dirac and the mass of the lightest XY gaugino is pushed well below that of the lowest gauge boson KK mode, improving the prospects for its production at the LHC. The bulk Lagrangian possesses a symmetry that we call GUT parity. If GUT parity is exact, the lightest GUT particle, most likely an XY gaugino, is stable. Once produced in a collider, the XY gaugino hadronizes to form mesons, some of which will be charged and visible as highly ionizing tracks. The lightest supersymmetric particle is the gravitino of mass \sim 10^{-3} eV, which is also stable if R parity is conserved. |
hep-ph/9609301 | John Gracey | J.A. Gracey | Anomalous dimensions of operators in polarized deep inelastic scattering
at O(1/N_f) | 22 latex pages plus 7 figures | Nucl.Phys.B480:73-98,1996 | 10.1016/S0550-3213(96)00485-3 | LTH 384 | hep-ph | null | Critical exponents are computed for a variety of twist-2 composite operators,
which occur in polarized and unpolarized deep inelastic scattering, at leading
order in the 1/N_f expansion. The resulting d-dimensional expressions, which
depend on the moment of the operator, are in agreement with recent explicit two
and three loop perturbative calculations. An interesting aspect of the critical
point approach which is used, is that the anomalous dimensions of the flavour
singlet eigenoperators, which diagonalize the perturbative mixing matrix, are
computed directly. We also elucidate the treatment of gamma^5 at the fixed
point which is important in simplifying the calculation for polarized
operators. Finally, the anomalous dimension of the singlet axial current is
determined at O(1/N_f) by considering the renormalization of the anomaly in
operator form.
| [
{
"created": "Tue, 10 Sep 1996 08:53:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gracey",
"J. A.",
""
]
] | Critical exponents are computed for a variety of twist-2 composite operators, which occur in polarized and unpolarized deep inelastic scattering, at leading order in the 1/N_f expansion. The resulting d-dimensional expressions, which depend on the moment of the operator, are in agreement with recent explicit two and three loop perturbative calculations. An interesting aspect of the critical point approach which is used, is that the anomalous dimensions of the flavour singlet eigenoperators, which diagonalize the perturbative mixing matrix, are computed directly. We also elucidate the treatment of gamma^5 at the fixed point which is important in simplifying the calculation for polarized operators. Finally, the anomalous dimension of the singlet axial current is determined at O(1/N_f) by considering the renormalization of the anomaly in operator form. |
2406.00946 | Huaicong Hu | Huai-cong Hu, Zhao-Yang Zhang, Ning-Yu Zhu, Hai-Xiang Chen | Higgs boson decays $h\rightarrow MZ$ in the TNMSSM | Accepted for published in Chinese Physics C | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the SM-like Higgs boson decays $h\rightarrow MZ$ in the Triplet
extended NMSSM (TNMSSM),where M is a vector meson ($\rho$, $\omega$, $\phi$,
$J/\Psi$, $\Upsilon$). Compared to the minimal supersymmetric standard model
(MSSM), the TNMSSM includes two new SU(2) triplets with hypercharge $\pm 1$ and
a SM gauge singlet which are coupled to each other. The indirect contributions
to the decays $h \rightarrow MZ$ are produced from the effective $h\gamma Z$
vertex, and they are more important than the direct contributions. The results
of this work would encourage a detection on $h \rightarrow Z\gamma$ at the
future high energy colliders for exploring new physics beyond the SM.
| [
{
"created": "Mon, 3 Jun 2024 02:57:20 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"Hu",
"Huai-cong",
""
],
[
"Zhang",
"Zhao-Yang",
""
],
[
"Zhu",
"Ning-Yu",
""
],
[
"Chen",
"Hai-Xiang",
""
]
] | We study the SM-like Higgs boson decays $h\rightarrow MZ$ in the Triplet extended NMSSM (TNMSSM),where M is a vector meson ($\rho$, $\omega$, $\phi$, $J/\Psi$, $\Upsilon$). Compared to the minimal supersymmetric standard model (MSSM), the TNMSSM includes two new SU(2) triplets with hypercharge $\pm 1$ and a SM gauge singlet which are coupled to each other. The indirect contributions to the decays $h \rightarrow MZ$ are produced from the effective $h\gamma Z$ vertex, and they are more important than the direct contributions. The results of this work would encourage a detection on $h \rightarrow Z\gamma$ at the future high energy colliders for exploring new physics beyond the SM. |
1606.05118 | Gang Li | Qi Wu, Gang Li, Fenglan Shao, Qianwen Wang, Ruiqin Wang, Yawei Zhang
and Ying Zheng | Production of the $X_b$ in $\Upsilon(5S, 6S)\to \gamma X_b$ radiative
decays | 11 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the production of $X_b$ in the process
$\Upsilon(5S,6S)\to \gamma X_b$, where $X_b$ is assumed to be the counterpart
of $X(3872)$ in the bottomonium sector as a $B {\bar B}^*$ molecular state. We
use the effective Lagrangian based on the heavy quark symmetry to explore the
rescattering mechanism and calculate their production ratios. Our results have
shown that the production ratios for the $\Upsilon(5S,6S) \to \gamma X_b$ are
orders of $10^{-5}$ with reasonable cutoff parameter range $\alpha \simeq 2\sim
3$. The sizeable production ratios may be accessible at the future experiments
like forthcoming BelleII, which will provide important clues to the inner
structures of the exotic state $X_b$.
| [
{
"created": "Thu, 16 Jun 2016 10:03:49 GMT",
"version": "v1"
}
] | 2016-06-17 | [
[
"Wu",
"Qi",
""
],
[
"Li",
"Gang",
""
],
[
"Shao",
"Fenglan",
""
],
[
"Wang",
"Qianwen",
""
],
[
"Wang",
"Ruiqin",
""
],
[
"Zhang",
"Yawei",
""
],
[
"Zheng",
"Ying",
""
]
] | In this work, we investigate the production of $X_b$ in the process $\Upsilon(5S,6S)\to \gamma X_b$, where $X_b$ is assumed to be the counterpart of $X(3872)$ in the bottomonium sector as a $B {\bar B}^*$ molecular state. We use the effective Lagrangian based on the heavy quark symmetry to explore the rescattering mechanism and calculate their production ratios. Our results have shown that the production ratios for the $\Upsilon(5S,6S) \to \gamma X_b$ are orders of $10^{-5}$ with reasonable cutoff parameter range $\alpha \simeq 2\sim 3$. The sizeable production ratios may be accessible at the future experiments like forthcoming BelleII, which will provide important clues to the inner structures of the exotic state $X_b$. |
1105.3149 | Thomas Teubner | K. Hagiwara, R. Liao, A.D. Martin, Daisuke Nomura and T. Teubner | (g-2)_mu and alpha(M_Z^2) re-evaluated using new precise data | 30 pages, including 18 figures. Minor changes, published version | J. Phys. G 38 (2011) 085003 | 10.1088/0954-3899/38/8/085003 | KEK-TH-1458, LTH 913, IPPP/11/18, DCPT/11/36, TU-883 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update our Standard Model predictions for g-2 of the muon and for the
hadronic contributions to the running of the QED coupling, Delta
alpha_had^(5)(M_Z^2). Particular emphasis is put on recent changes in the
hadronic contributions from new data in the 2pi channel and from the energy
region just below 2 GeV. In particular, for the e+e- -> pi+pi- contribution we
include the recent `radiative return' data from KLOE and BaBar. We also include
the recent BaBar data on other exclusive channels. We make a detailed study of
the effect of replacing the measurements of the inclusive cross section,
sigma(e+e- -> hadrons), by the sum of the exclusive channels in the energy
interval 1.43 < sqrt{s} < 2 GeV, which includes a QCD sum-rule analysis of this
energy region. Our favoured prediction for the muon anomalous magnetic moment
is (g-2)/2 = (11659182.8 +- 4.9)*10^(-10) which is 3.3 sigma below the present
world-average measurement. We compare our g-2 value with other recent
calculations. Our prediction for the QED coupling, obtained via Delta
alpha_had^(5)(M_Z^2) = (276.26 +- 1.38)*10^(-4), is alpha(M_Z^2)^(-1) = 128.944
+- 0.019.
| [
{
"created": "Mon, 16 May 2011 17:03:58 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Aug 2011 16:48:55 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Hagiwara",
"K.",
""
],
[
"Liao",
"R.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Nomura",
"Daisuke",
""
],
[
"Teubner",
"T.",
""
]
] | We update our Standard Model predictions for g-2 of the muon and for the hadronic contributions to the running of the QED coupling, Delta alpha_had^(5)(M_Z^2). Particular emphasis is put on recent changes in the hadronic contributions from new data in the 2pi channel and from the energy region just below 2 GeV. In particular, for the e+e- -> pi+pi- contribution we include the recent `radiative return' data from KLOE and BaBar. We also include the recent BaBar data on other exclusive channels. We make a detailed study of the effect of replacing the measurements of the inclusive cross section, sigma(e+e- -> hadrons), by the sum of the exclusive channels in the energy interval 1.43 < sqrt{s} < 2 GeV, which includes a QCD sum-rule analysis of this energy region. Our favoured prediction for the muon anomalous magnetic moment is (g-2)/2 = (11659182.8 +- 4.9)*10^(-10) which is 3.3 sigma below the present world-average measurement. We compare our g-2 value with other recent calculations. Our prediction for the QED coupling, obtained via Delta alpha_had^(5)(M_Z^2) = (276.26 +- 1.38)*10^(-4), is alpha(M_Z^2)^(-1) = 128.944 +- 0.019. |
hep-ph/9605318 | Dennis Silverman | Dennis Silverman (U.C. Irvine) | Anomalous Chromomagnetic Moments of Quarks and Large Transverse Energy
Jets | REVTeX, 11 pages, 2 postscript figures | Phys.Rev.D54:5563-5566,1996 | 10.1103/PhysRevD.54.5563 | SLAC-PUB-7166, U.C. Irvine TR-96-12 | hep-ph | null | We consider the jet cross sections for gluons coupling to quarks with an
anomalous chromomagnetic moment. We then apply this to the deviation and bounds
from QCD found in the CDF and D0 Fermilab data, respectively, to find a range
of possible values for the anomalous moments. The quadratic and quartic terms
in the anomalous moments can fit to the rise of a deviation with transverse
energy. Since previous analyses have been done on the top quark total cross
section, here we assume the same moment on all quarks except the top and find
the range $|\kappa'| \equiv |\kappa/(2 m_q)| = 1.0\pm 0.3$ TeV$^{-1}$ for the
CDF data. Assuming the anomalous moment is present only on a charm or bottom
quark which is pair produced results in a range $|\kappa'_{b,c}| = 3.5 \pm 1.0
$ TeV$^{-1}$. The magnitudes here are compared with anomalous magnetic moments
that could account for $R_b$ and found to be in the same general range, as well
as not inconsistent with LEP and SLD bounds on $\Delta \Gamma_{\text{had}}$.
| [
{
"created": "Wed, 15 May 1996 13:55:35 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Silverman",
"Dennis",
"",
"U.C. Irvine"
]
] | We consider the jet cross sections for gluons coupling to quarks with an anomalous chromomagnetic moment. We then apply this to the deviation and bounds from QCD found in the CDF and D0 Fermilab data, respectively, to find a range of possible values for the anomalous moments. The quadratic and quartic terms in the anomalous moments can fit to the rise of a deviation with transverse energy. Since previous analyses have been done on the top quark total cross section, here we assume the same moment on all quarks except the top and find the range $|\kappa'| \equiv |\kappa/(2 m_q)| = 1.0\pm 0.3$ TeV$^{-1}$ for the CDF data. Assuming the anomalous moment is present only on a charm or bottom quark which is pair produced results in a range $|\kappa'_{b,c}| = 3.5 \pm 1.0 $ TeV$^{-1}$. The magnitudes here are compared with anomalous magnetic moments that could account for $R_b$ and found to be in the same general range, as well as not inconsistent with LEP and SLD bounds on $\Delta \Gamma_{\text{had}}$. |
hep-ph/0512165 | Pedro David Ruiz-Femenia | Andre Hoang and Pedro Ruiz-Femenia | Nonrelativistic QCD for coloured scalar fields | 4 pages, 3 figures, uses PoS style. Contribution to the proceedings
of the International Europhysics Conference on High Energy Physics (HEP2005),
Lisboa, Portugal, 21-27 July 2005 | null | null | MPP-2005-162 | hep-ph | null | We present an effective field theory suitable to describe a non-relativistic
particle-antiparticle pair of heavy scalars based on the gauge group SU(3). Its
formulation is analogous to that of "velocity NRQCD" (vNRQCD), a
non-relativistic effective theory for heavy quark pairs. The matching
conditions with scalar QCD and the renormalization group evolution of the
effective theory are discussed. The non-relativistic framework proposed here
suffices to compute scalar-antiscalar bound state energies at
next-to-next-to-leading-logarithmic (NNLL) order and
next-to-leading-logarithmic (NLL) threshold production of squarks in $e^+e^-$
and $\gamma\gamma$ collisions, in particular of the lighter scalar top quark at
a future Linear Collider.
| [
{
"created": "Tue, 13 Dec 2005 17:50:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hoang",
"Andre",
""
],
[
"Ruiz-Femenia",
"Pedro",
""
]
] | We present an effective field theory suitable to describe a non-relativistic particle-antiparticle pair of heavy scalars based on the gauge group SU(3). Its formulation is analogous to that of "velocity NRQCD" (vNRQCD), a non-relativistic effective theory for heavy quark pairs. The matching conditions with scalar QCD and the renormalization group evolution of the effective theory are discussed. The non-relativistic framework proposed here suffices to compute scalar-antiscalar bound state energies at next-to-next-to-leading-logarithmic (NNLL) order and next-to-leading-logarithmic (NLL) threshold production of squarks in $e^+e^-$ and $\gamma\gamma$ collisions, in particular of the lighter scalar top quark at a future Linear Collider. |
hep-ph/9805298 | Robert Thorne | R.S. Thorne | Heavy Quarks and Structure Functions | 4pages, Latex, 2 postscript figures. Contribution to International
Workshop on Deep Inelastic Scattering and QCD, DIS98, Brussels, Belgium,
April 1998 | null | null | null | hep-ph | null | I present a method for calculating heavy quark production which extrapolates
smoothly from the well understood limits of the fixed-flavour number scheme for
Q^2 approx m_H^2 to the zero-mass scheme at Q^2/m_H^2 -> infinity. For all Q^2
> m_H^2 the evolution of the heavy quark distribution is precisely as in the
massless MSbar scheme. The method is simple to implement and compares well with
data.
| [
{
"created": "Tue, 12 May 1998 15:56:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thorne",
"R. S.",
""
]
] | I present a method for calculating heavy quark production which extrapolates smoothly from the well understood limits of the fixed-flavour number scheme for Q^2 approx m_H^2 to the zero-mass scheme at Q^2/m_H^2 -> infinity. For all Q^2 > m_H^2 the evolution of the heavy quark distribution is precisely as in the massless MSbar scheme. The method is simple to implement and compares well with data. |
1503.08531 | Michael Trusov | Yu.A. Simonov, M.A. Trusov | Confinement and $\alpha_s$ in a strong magnetic field | 14 pages; 2 figures; LaTeX2e | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hadron decay widths are shown to increase in strong magnetic fields as
$\Gamma (eB) \sim \frac{eB}{\kappa} \Gamma(0)$. The same mechanism is shown to
be present in the production of the sea quark pair inside the confining string,
which decreases the string tension with the growing $eB$ parallel to the string
. On the other hand, the average energy of the $q\bar q$ holes in the string
world sheet increases, when the direction of $\mathbf{B}$ is perpendicular to
the sheet. These two effects stipulate the spectacular picture of the
$\mathbf{B}$ dependent confinement and $\alpha_s$, discovered on the lattice.
| [
{
"created": "Mon, 30 Mar 2015 04:49:06 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2015 18:25:10 GMT",
"version": "v2"
}
] | 2015-04-02 | [
[
"Simonov",
"Yu. A.",
""
],
[
"Trusov",
"M. A.",
""
]
] | Hadron decay widths are shown to increase in strong magnetic fields as $\Gamma (eB) \sim \frac{eB}{\kappa} \Gamma(0)$. The same mechanism is shown to be present in the production of the sea quark pair inside the confining string, which decreases the string tension with the growing $eB$ parallel to the string . On the other hand, the average energy of the $q\bar q$ holes in the string world sheet increases, when the direction of $\mathbf{B}$ is perpendicular to the sheet. These two effects stipulate the spectacular picture of the $\mathbf{B}$ dependent confinement and $\alpha_s$, discovered on the lattice. |
2002.10275 | We-Fu Chang | We-Fu Chang and Jiajun Liao | Constraints on light singlet fermion interactions from coherent elastic
neutrino-nucleus scattering | 23 pages, 4 figures, References added. To match the published version | Phys. Rev. D 102, 075004 (2020) | 10.1103/PhysRevD.102.075004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exotic singlet fermions $\chi$, with a mass $m_\chi\lesssim 50$ MeV,
could be produced at the coherent elastic neutrino-nucleus scattering
(CE$\nu$NS) experiments through the $\nu {\mathcal N} \rightarrow \chi
{\mathcal N}$ process. Due to the coherent enhancement, it offers a unique way
to study how $\chi$ interacts with the Standard Model (SM) sector. Based on the
most general dimension-6 effective Lagrangian, we perform a comprehensive study
on the relevant interaction between $\chi$ and the SM sector. From the current
and future COHERENT and future CONUS experiments, we obtain the upper bounds on
the Wilson coefficients for the dipole, scalar, vector, and tensor
interactions. For $m_\chi $ below 10 MeV, future CONUS data has the best
sensitivity, while for $m_\chi$ between 10 MeV$-50$ MeV, the current and future
COHERENT bounds dominate. These limits are complementary to those from neutrino
oscillation and collider searches. Moreover, the bounds do not depend on the
charge conjugation property of $\chi$, nor whether $\chi$ is dark matter or
not.
| [
{
"created": "Mon, 24 Feb 2020 14:09:02 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2020 01:46:31 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Oct 2020 15:27:00 GMT",
"version": "v3"
}
] | 2020-10-14 | [
[
"Chang",
"We-Fu",
""
],
[
"Liao",
"Jiajun",
""
]
] | The exotic singlet fermions $\chi$, with a mass $m_\chi\lesssim 50$ MeV, could be produced at the coherent elastic neutrino-nucleus scattering (CE$\nu$NS) experiments through the $\nu {\mathcal N} \rightarrow \chi {\mathcal N}$ process. Due to the coherent enhancement, it offers a unique way to study how $\chi$ interacts with the Standard Model (SM) sector. Based on the most general dimension-6 effective Lagrangian, we perform a comprehensive study on the relevant interaction between $\chi$ and the SM sector. From the current and future COHERENT and future CONUS experiments, we obtain the upper bounds on the Wilson coefficients for the dipole, scalar, vector, and tensor interactions. For $m_\chi $ below 10 MeV, future CONUS data has the best sensitivity, while for $m_\chi$ between 10 MeV$-50$ MeV, the current and future COHERENT bounds dominate. These limits are complementary to those from neutrino oscillation and collider searches. Moreover, the bounds do not depend on the charge conjugation property of $\chi$, nor whether $\chi$ is dark matter or not. |
2402.00621 | Tyler Gorda | Jes\'us Cruz Rojas, Tyler Gorda, Carlos Hoyos, Niko Jokela, Matti
J\"arvinen, Aleksi Kurkela, Risto Paatelainen, Saga S\"appi, Aleksi Vuorinen | Estimate for the bulk viscosity of strongly coupled quark matter | 18 pages, 6 figures | null | null | APCTP Pre2024 - 003, HIP-2024-1/TH, TUM-EFT 187/24 | hep-ph astro-ph.HE hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modern hydrodynamic simulations of core-collapse supernovae and neutron-star
mergers require knowledge not only of the equilibrium properties of strongly
interacting matter, but also of the system's response to perturbations, encoded
in various transport coefficients. Using perturbative and holographic tools, we
derive here an improved weak-coupling and a new strong-coupling result for the
most important transport coefficient of unpaired quark matter, its bulk
viscosity. These results are combined in a simple analytic pocket formula for
the quantity that is rooted in perturbative Quantum Chromodynamics at high
densities but takes into account nonperturbative holographic input at
neutron-star densities, where the system is strongly coupled. This expression
can be used in the modeling of unpaired quark matter at astrophysically
relevant temperatures and densities.
| [
{
"created": "Thu, 1 Feb 2024 14:31:23 GMT",
"version": "v1"
}
] | 2024-02-02 | [
[
"Rojas",
"Jesús Cruz",
""
],
[
"Gorda",
"Tyler",
""
],
[
"Hoyos",
"Carlos",
""
],
[
"Jokela",
"Niko",
""
],
[
"Järvinen",
"Matti",
""
],
[
"Kurkela",
"Aleksi",
""
],
[
"Paatelainen",
"Risto",
""
],
[
... | Modern hydrodynamic simulations of core-collapse supernovae and neutron-star mergers require knowledge not only of the equilibrium properties of strongly interacting matter, but also of the system's response to perturbations, encoded in various transport coefficients. Using perturbative and holographic tools, we derive here an improved weak-coupling and a new strong-coupling result for the most important transport coefficient of unpaired quark matter, its bulk viscosity. These results are combined in a simple analytic pocket formula for the quantity that is rooted in perturbative Quantum Chromodynamics at high densities but takes into account nonperturbative holographic input at neutron-star densities, where the system is strongly coupled. This expression can be used in the modeling of unpaired quark matter at astrophysically relevant temperatures and densities. |
1302.5098 | Michael Strickland | Maximilian Attems, Anton Rebhan, and Michael Strickland | The chromo-Weibel instability in an expanding background | 8 pages, 3 figures; Proceedings contribution for the International
Symposium on Multiparticle Dynamics, Kielce, Poland, Sept 2012 | Acta Phys. Polon. Supp. 6, 393-402 (2013) | 10.5506/APhysPolBSupp.6.393 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this proceedings contribution we review recent calculations of the
dynamics of the chromo-Weibel instability in the quark gluon plasma. This
instability is present in gauge theories with a one-particle distribution
function which is momentum-space anisotropic in the local rest frame. The
conditions necessary for triggering this instability can be present already in
the color-glass-condensate initial state or dynamically generated by the rapid
longitudinal expansion of the matter created in a heavy-ion collision. Using
the hard-loop framework we study the case that the one-particle distribution
function possesses an arbitrary initial momentum anisotropy that increases in
time due to longitudinal free streaming. The resulting three-dimensional
dynamical equations for the chromofield evolution are solved numerically. We
find that there is regeneration of the longitudinal pressure due to unstable
plasma modes; nevertheless, the system seems to maintain a high-degree of
momentum-space anisotropy. Despite this anisotropy, we find that there is rapid
longitudinal thermalization of the plasma due to the non-linear mode couplings
inherent in the unstable evolution.
| [
{
"created": "Wed, 20 Feb 2013 20:51:14 GMT",
"version": "v1"
}
] | 2013-07-22 | [
[
"Attems",
"Maximilian",
""
],
[
"Rebhan",
"Anton",
""
],
[
"Strickland",
"Michael",
""
]
] | In this proceedings contribution we review recent calculations of the dynamics of the chromo-Weibel instability in the quark gluon plasma. This instability is present in gauge theories with a one-particle distribution function which is momentum-space anisotropic in the local rest frame. The conditions necessary for triggering this instability can be present already in the color-glass-condensate initial state or dynamically generated by the rapid longitudinal expansion of the matter created in a heavy-ion collision. Using the hard-loop framework we study the case that the one-particle distribution function possesses an arbitrary initial momentum anisotropy that increases in time due to longitudinal free streaming. The resulting three-dimensional dynamical equations for the chromofield evolution are solved numerically. We find that there is regeneration of the longitudinal pressure due to unstable plasma modes; nevertheless, the system seems to maintain a high-degree of momentum-space anisotropy. Despite this anisotropy, we find that there is rapid longitudinal thermalization of the plasma due to the non-linear mode couplings inherent in the unstable evolution. |
hep-ph/0403219 | Steven D. Bass | Steven D. Bass | Anomalous commutators and electroweak baryogenesis | 9 pages | Phys.Lett. B590 (2004) 115-119 | 10.1016/j.physletb.2004.03.085 | null | hep-ph | null | Electroweak vacuum transition processes (sphalerons) in the early Universe
provide a possible explanation of the baryon asymmetry. Combining this physics
with the anomalous commutators of Adler and Boulware and renormalization group
invariance, we argue that electroweak baryon number violation also induces a
``topological condensate'' in the vacuum. QCD sphaleron processes act to
distribute the baryon number violation between both left and right handed
quarks and induce a spin independent component in this ``condensate''.
| [
{
"created": "Fri, 19 Mar 2004 17:17:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bass",
"Steven D.",
""
]
] | Electroweak vacuum transition processes (sphalerons) in the early Universe provide a possible explanation of the baryon asymmetry. Combining this physics with the anomalous commutators of Adler and Boulware and renormalization group invariance, we argue that electroweak baryon number violation also induces a ``topological condensate'' in the vacuum. QCD sphaleron processes act to distribute the baryon number violation between both left and right handed quarks and induce a spin independent component in this ``condensate''. |
1407.0264 | Tao Liu | Alexander Kurz, Tao Liu, Peter Marquard, Matthias Steinhauser | Higher-order hadronic and heavy-lepton contributions to the anomalous
magnetic moment | Contribution to the proceedings of Loops and Legs in Quantum Field
Theory, 27 April - 2 May 2014, Weimar, Germany | null | null | DESY 14-112, LPN14-079, SFB/CPP-14-34, TTP14-017 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report about recent results obtained for the muon anomalous magnetic
moment. Three-loop kernel functions have been computed to obtain the
next-to-next-to-leading-order hadronic vacuum polarization contributions. The
numerical result, $a_\mu^{\rm{had,NNLO}}=1.24\pm 0.01 \times 10^{-10}$, is of
the same order of magnitude as the current uncertainty from the hadronic
contributions. For heavy-lepton corrections, analytical results are obtained at
four-loop order and compared with the known results.
| [
{
"created": "Tue, 1 Jul 2014 14:50:03 GMT",
"version": "v1"
}
] | 2014-07-02 | [
[
"Kurz",
"Alexander",
""
],
[
"Liu",
"Tao",
""
],
[
"Marquard",
"Peter",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | We report about recent results obtained for the muon anomalous magnetic moment. Three-loop kernel functions have been computed to obtain the next-to-next-to-leading-order hadronic vacuum polarization contributions. The numerical result, $a_\mu^{\rm{had,NNLO}}=1.24\pm 0.01 \times 10^{-10}$, is of the same order of magnitude as the current uncertainty from the hadronic contributions. For heavy-lepton corrections, analytical results are obtained at four-loop order and compared with the known results. |
hep-ph/0011227 | Sang Pyo Kim | Sang Pyo Kim (Univ. of Alberta, Kunsan Nat'l Univ.) Chul H. Lee
(Hanyang Univ.) | Emergence of Classicality in Quantum Phase Transitions | RevTex 13 pages, no figures. Decoherence discussed in a linear
coupling model. Version to appear in Phys. Rev. D | Phys.Rev. D65 (2002) 045013 | 10.1103/PhysRevD.65.045013 | null | hep-ph cond-mat.stat-mech hep-th nucl-th | null | We show that classicality emerges during quantum phase transitions due to
parametric interactions without coupling to environments. The Wigner functions
are explicitly calculated for the Gaussian vacuum, number, and thermal states
of a free scalar field that describes the spinodal instability regime. The
Wigner functions are sharply peaked around their classical trajectories during
the phase transition and exhibit classical correlation only for unstable long
wavelength modes but retain quantum coherence for short wavelength modes. Thus
classicality emerges from the quantum evolution of phase transitions without a
classical order parameter. We define a quantal ordering parameter that is
linear in the field variable and satisfies the classical field equation.
| [
{
"created": "Fri, 17 Nov 2000 23:00:29 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2001 19:44:11 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Kim",
"Sang Pyo",
"",
"Univ. of Alberta, Kunsan Nat'l Univ."
],
[
"Lee",
"Chul H.",
"",
"Hanyang Univ."
]
] | We show that classicality emerges during quantum phase transitions due to parametric interactions without coupling to environments. The Wigner functions are explicitly calculated for the Gaussian vacuum, number, and thermal states of a free scalar field that describes the spinodal instability regime. The Wigner functions are sharply peaked around their classical trajectories during the phase transition and exhibit classical correlation only for unstable long wavelength modes but retain quantum coherence for short wavelength modes. Thus classicality emerges from the quantum evolution of phase transitions without a classical order parameter. We define a quantal ordering parameter that is linear in the field variable and satisfies the classical field equation. |
hep-ph/0006244 | E. Martynov | P.Desgrolard, M.Giffon, E.Martynov, E.Predazzi | Exchange-degenerate Regge trajectories: a fresh look from resonance and
forward scattering regions | 13 pages, LaTeX2e, 4 eps figures. Revised version accepted for
publication in European Physical Journal C | Eur.Phys.J.C18:555-561,2001 | 10.1007/s100520100548 | LYCEN 2000-60, DFTT 28/2000 | hep-ph | null | The exchange-degeneracy of the mesonic $f$, $\omega $, $\rho $ and $a_{2}$
Regge trajectories, dominant at moderate and high energies in hadron elastic
scattering, is analyzed from two viewpoints. The first one concerns the masses
of the resonances lying on these trajectories; the second one deals with the
total cross-sections and the ratios of the real to the imaginary parts of the
forward amplitudes of hadron and photon induced reactions. Neither set of data
supports exact exchange-degeneracy.
| [
{
"created": "Wed, 21 Jun 2000 08:44:13 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Nov 2000 00:06:58 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Desgrolard",
"P.",
""
],
[
"Giffon",
"M.",
""
],
[
"Martynov",
"E.",
""
],
[
"Predazzi",
"E.",
""
]
] | The exchange-degeneracy of the mesonic $f$, $\omega $, $\rho $ and $a_{2}$ Regge trajectories, dominant at moderate and high energies in hadron elastic scattering, is analyzed from two viewpoints. The first one concerns the masses of the resonances lying on these trajectories; the second one deals with the total cross-sections and the ratios of the real to the imaginary parts of the forward amplitudes of hadron and photon induced reactions. Neither set of data supports exact exchange-degeneracy. |
2204.11935 | James Gratrex | James Gratrex, Bla\v{z}enka Meli\'c and Ivan Ni\v{s}and\v{z}i\'c | Lifetimes of singly charmed hadrons | 68 pages, 6 figures. v2: two references added; cosmetic changes to
all figures; some typos corrected; numerics and conclusions unchanged. Text
updated to correspond with journal version | JHEP 07 (2022) 058 | 10.1007/JHEP07(2022)058 | RBI-ThPhys-2022-8 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We provide an extensive study of the lifetimes of singly charmed baryons and
mesons, within the heavy quark expansion with all known corrections included. A
special attention is devoted to the choice of the charm mass and wavefunctions
of heavy baryons. We give our predictions for lifetimes, lifetime ratios, and
semileptonic branching ratios of singly charmed baryons. Our results
accommodate the experimentally-favoured hierarchy of singly charmed baryon
lifetimes \begin{eqnarray*} \tau\left(\Xi_c^{0}\right) <
\tau\left(\Lambda_c^{+}\right)< \tau\left(\Omega_c^{0}\right) <
\tau\left(\Xi_c^{+}\right)\, \end{eqnarray*} in contrast to earlier theoretical
findings. Predictions for charmed meson lifetimes and semileptonic decay rates
are in agreement with a recent comprehensive study and experimental results
within uncertainties.
| [
{
"created": "Mon, 25 Apr 2022 19:29:43 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2022 16:44:03 GMT",
"version": "v2"
}
] | 2022-07-12 | [
[
"Gratrex",
"James",
""
],
[
"Melić",
"Blaženka",
""
],
[
"Nišandžić",
"Ivan",
""
]
] | We provide an extensive study of the lifetimes of singly charmed baryons and mesons, within the heavy quark expansion with all known corrections included. A special attention is devoted to the choice of the charm mass and wavefunctions of heavy baryons. We give our predictions for lifetimes, lifetime ratios, and semileptonic branching ratios of singly charmed baryons. Our results accommodate the experimentally-favoured hierarchy of singly charmed baryon lifetimes \begin{eqnarray*} \tau\left(\Xi_c^{0}\right) < \tau\left(\Lambda_c^{+}\right)< \tau\left(\Omega_c^{0}\right) < \tau\left(\Xi_c^{+}\right)\, \end{eqnarray*} in contrast to earlier theoretical findings. Predictions for charmed meson lifetimes and semileptonic decay rates are in agreement with a recent comprehensive study and experimental results within uncertainties. |
hep-ph/0111093 | M. V. T. Machado | M.B. Gay Ducati, M.V.T. Machado | Unitarity Corrections to the Proton Structure Functions through the
Dipole Picture | 16 pages, 8 figures. Version to be published in Phys. Rev. D | Phys.Rev. D65 (2002) 114019 | 10.1103/PhysRevD.65.114019 | null | hep-ph | null | We study the dipole picture for the description of the deep inelastic
scattering, focusing on the structure functions which are driven directly by
the gluon distribution. One performs estimates using the effective dipole cross
section given by the Glauber-Mueller approach in QCD, which encodes the
corrections due to the unitarity effects associated with the saturation
phenomenon. We also address issues about frame invariance of the calculations
when analysing the observables.
| [
{
"created": "Thu, 8 Nov 2001 17:22:00 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2002 18:07:25 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Ducati",
"M. B. Gay",
""
],
[
"Machado",
"M. V. T.",
""
]
] | We study the dipole picture for the description of the deep inelastic scattering, focusing on the structure functions which are driven directly by the gluon distribution. One performs estimates using the effective dipole cross section given by the Glauber-Mueller approach in QCD, which encodes the corrections due to the unitarity effects associated with the saturation phenomenon. We also address issues about frame invariance of the calculations when analysing the observables. |
hep-ph/9907563 | Reinhard Alkofer | R. Alkofer, S. Ahlig, C. Fischer, M. Oettel, and H. Reinhardt | Octet and Decuplet Baryons in a Confining and Covariant Diquark-Quark
Model | 4 pages, 1 figure; talk given by R. Alkofer at PANIC 99 | Nucl.Phys.A663:683-686,2000 | 10.1016/S0375-9474(99)00721-6 | UNITU-THEP-7/1999 | hep-ph | null | We treat baryons as bound states of scalar or axialvector diquarks and a
constituent quark which interact through quark exchange. We obtain fully
four-dimensional wave functions for both octet and decuplet baryons as
solutions of the corresponding Bethe-Salpeter equation. Applications currently
under investigation are: electromagnetic and strong form factors and
strangeness production processes.
| [
{
"created": "Fri, 30 Jul 1999 12:50:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Alkofer",
"R.",
""
],
[
"Ahlig",
"S.",
""
],
[
"Fischer",
"C.",
""
],
[
"Oettel",
"M.",
""
],
[
"Reinhardt",
"H.",
""
]
] | We treat baryons as bound states of scalar or axialvector diquarks and a constituent quark which interact through quark exchange. We obtain fully four-dimensional wave functions for both octet and decuplet baryons as solutions of the corresponding Bethe-Salpeter equation. Applications currently under investigation are: electromagnetic and strong form factors and strangeness production processes. |
2312.02067 | Simone Zoia | Francesco Calisto, Ryan Moodie, Simone Zoia | Learning Feynman integrals from differential equations with neural
networks | 33 pages, 12 figures, 3 tables, 2 appendices; published version | JHEP 07 (2024) 124 | 10.1007/JHEP07(2024)124 | CERN-TH-2023-225 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We perform an exploratory study of a new approach for evaluating Feynman
integrals numerically. We apply the recently-proposed framework of
physics-informed deep learning to train neural networks to approximate the
solution to the differential equations satisfied by the Feynman integrals. This
approach relies neither on a canonical form of the differential equations,
which is often a bottleneck for the analytical techniques, nor on the
availability of a large dataset, and after training yields essentially
instantaneous evaluation times. We provide a proof-of-concept implementation
within the PyTorch framework, and apply it to a number of one- and two-loop
examples, achieving a mean magnitude of relative difference of around 1% at two
loops in the physical phase space with network training times on the order of
an hour on a laptop GPU.
| [
{
"created": "Mon, 4 Dec 2023 17:26:49 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jul 2024 08:39:14 GMT",
"version": "v2"
}
] | 2024-07-24 | [
[
"Calisto",
"Francesco",
""
],
[
"Moodie",
"Ryan",
""
],
[
"Zoia",
"Simone",
""
]
] | We perform an exploratory study of a new approach for evaluating Feynman integrals numerically. We apply the recently-proposed framework of physics-informed deep learning to train neural networks to approximate the solution to the differential equations satisfied by the Feynman integrals. This approach relies neither on a canonical form of the differential equations, which is often a bottleneck for the analytical techniques, nor on the availability of a large dataset, and after training yields essentially instantaneous evaluation times. We provide a proof-of-concept implementation within the PyTorch framework, and apply it to a number of one- and two-loop examples, achieving a mean magnitude of relative difference of around 1% at two loops in the physical phase space with network training times on the order of an hour on a laptop GPU. |
hep-ph/0612080 | Xiao-Gang He | Xiao-Gang He (NTU) | $A_4$ Group and Tri-bimaximal Neutrino Mixing -- A Renormalizable Model | 4 pages | Nucl.Phys.Proc.Suppl.168:350-352,2007 | 10.1016/j.nuclphysbps.2007.02.034 | null | hep-ph | null | The tetrahedron $A_4$ group has been widely used in studying neutrino mixing
matrix. It provides a natural framework of model building for the tri-bimaximal
mixing matrix. In this class of models, it is necessary to have two Higgs
fields, $\chi$ and $\chi'$, transforming under $A_4$ as 3 with one of them
having vacuum expectation values for the three components to be equal and
another having only one of the components to be non-zero. These specific vev
structures require separating $\chi$ and $\chi'$ from communicating with each
other. The clash of the different vev structures for $\chi$ and $\chi'$ is the
so called sequestering problem. In this work, I show that it is possible to
construct renormalizable supersymmetric models producing the tri-bimaximal
neutrino mixing with no sequestering problem.
| [
{
"created": "Thu, 7 Dec 2006 10:50:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"He",
"Xiao-Gang",
"",
"NTU"
]
] | The tetrahedron $A_4$ group has been widely used in studying neutrino mixing matrix. It provides a natural framework of model building for the tri-bimaximal mixing matrix. In this class of models, it is necessary to have two Higgs fields, $\chi$ and $\chi'$, transforming under $A_4$ as 3 with one of them having vacuum expectation values for the three components to be equal and another having only one of the components to be non-zero. These specific vev structures require separating $\chi$ and $\chi'$ from communicating with each other. The clash of the different vev structures for $\chi$ and $\chi'$ is the so called sequestering problem. In this work, I show that it is possible to construct renormalizable supersymmetric models producing the tri-bimaximal neutrino mixing with no sequestering problem. |
hep-ph/0402282 | Masahide Yamaguchi | Masahide Yamaguchi and Jun'ichi Yokoyama | Smooth hybrid inflation in supergravity with a running spectral index
and early star formation | 12 pages, 1 figure, to appear in Phys. Rev. D | Phys.Rev.D70:023513,2004 | 10.1103/PhysRevD.70.023513 | BROWN-HET-1397, OU-TAP-226 | hep-ph astro-ph | null | It is shown that in a smooth hybrid inflation model in supergravity adiabatic
fluctuations with a running spectral index with $\ns >1$ on a large scale and
$\ns <1$ on a smaller scale can be naturally generated, as favored by the
first-year data of WMAP. It is due to the balance between the nonrenormalizable
term in the superpotential and the supergravity effect. However, since smooth
hybrid inflation does not last long enough to reproduce the central value of
observation, we invoke new inflation after the first inflation. Its initial
condition is set dynamically during smooth hybrid inflation and the spectrum of
fluctuations generated in this regime can have an appropriate shape to realize
early star formation as found by WMAP. Hence two new features of WMAP
observations are theoretically explained in a unified manner.
| [
{
"created": "Thu, 26 Feb 2004 22:23:31 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Mar 2004 18:52:51 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Jul 2004 08:21:07 GMT",
"version": "v3"
}
] | 2009-06-19 | [
[
"Yamaguchi",
"Masahide",
""
],
[
"Yokoyama",
"Jun'ichi",
""
]
] | It is shown that in a smooth hybrid inflation model in supergravity adiabatic fluctuations with a running spectral index with $\ns >1$ on a large scale and $\ns <1$ on a smaller scale can be naturally generated, as favored by the first-year data of WMAP. It is due to the balance between the nonrenormalizable term in the superpotential and the supergravity effect. However, since smooth hybrid inflation does not last long enough to reproduce the central value of observation, we invoke new inflation after the first inflation. Its initial condition is set dynamically during smooth hybrid inflation and the spectrum of fluctuations generated in this regime can have an appropriate shape to realize early star formation as found by WMAP. Hence two new features of WMAP observations are theoretically explained in a unified manner. |
2303.05492 | Naoya Kitajima | Naoya Kitajima, Fuminobu Takahashi | Resonant production of dark photons from axion without a large coupling | 16 pages, 5 figures | null | 10.1103/PhysRevD.107.123518 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Dark photons could be produced resonantly by the oscillating axion field in
the early universe. This resonant production mechanism has been used in various
contexts, including dark photon dark matter and primordial magnetic field
production. However, for this resonant production to work in an expanding
universe, a large axion-dark photon coupling is required, which is not easy to
realize in terms of model building and requires the introduction of many
charged fermions and/or the complex clockwork mechanism. In this paper, we
present a new scenario that efficiently produces dark photons from the axion
with a much smaller coupling. This is possible by modifying the dynamics of
axion and significantly delaying the onset of oscillations, as in the so-called
trapped misalignment mechanism. As a specific example, we consider models in
which dark photon production occurs efficiently despite the small axion-dark
photon coupling by temporally trapping an axion in a wrong minimum and
releasing it after the Hubble parameter becomes much smaller than the axion
mass. In this scenario, it is expected that the polarization asymmetry of dark
photons and gravitational waves generated from dark photons will be
significantly reduced.
| [
{
"created": "Thu, 9 Mar 2023 18:47:17 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Kitajima",
"Naoya",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] | Dark photons could be produced resonantly by the oscillating axion field in the early universe. This resonant production mechanism has been used in various contexts, including dark photon dark matter and primordial magnetic field production. However, for this resonant production to work in an expanding universe, a large axion-dark photon coupling is required, which is not easy to realize in terms of model building and requires the introduction of many charged fermions and/or the complex clockwork mechanism. In this paper, we present a new scenario that efficiently produces dark photons from the axion with a much smaller coupling. This is possible by modifying the dynamics of axion and significantly delaying the onset of oscillations, as in the so-called trapped misalignment mechanism. As a specific example, we consider models in which dark photon production occurs efficiently despite the small axion-dark photon coupling by temporally trapping an axion in a wrong minimum and releasing it after the Hubble parameter becomes much smaller than the axion mass. In this scenario, it is expected that the polarization asymmetry of dark photons and gravitational waves generated from dark photons will be significantly reduced. |
1801.05478 | Feng Yuan | Bo-Wen Xiao, Feng Yuan | BFKL and Sudakov Resummation in Higgs Boson Plus Jet Production with
Large Rapidity Separation | 10 pages, 1 figure | null | 10.1016/j.physletb.2018.04.070 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the QCD resummation for the Higgs boson plus a high $P_T$ jet
production with large rapidity separations in proton-proton collisions at the
LHC. The relevant Balitsky-Fadin-Kuraev-Lipatov (BFKL) and Sudakov logs are
identified and resummed. In particular, we apply recent developments of the
transverse momentum dependent factorization formalism in the impact factors,
which provides a systematic framework to incorporate both the BFKL and Sudakov
resummations.
| [
{
"created": "Tue, 16 Jan 2018 20:51:50 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Xiao",
"Bo-Wen",
""
],
[
"Yuan",
"Feng",
""
]
] | We investigate the QCD resummation for the Higgs boson plus a high $P_T$ jet production with large rapidity separations in proton-proton collisions at the LHC. The relevant Balitsky-Fadin-Kuraev-Lipatov (BFKL) and Sudakov logs are identified and resummed. In particular, we apply recent developments of the transverse momentum dependent factorization formalism in the impact factors, which provides a systematic framework to incorporate both the BFKL and Sudakov resummations. |
1506.09080 | Raghunath Sahoo | Edward K.G. Sarkisyan, Aditya Nath Mishra, Raghunath Sahoo, and
Alexander S. Sakharov | Multihadron production dynamics exploring the energy balance in hadronic
and nuclear collisions | 14 pages, 9 figures, Version similar to the published version in
Phys. Rev. D, Fig. 1 caption has gone through minor changes | Phys. Rev. D 93, 054046 (2016) | 10.1103/PhysRevD.93.054046 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The multihadron production in nucleus-nucleus collisions and its
interrelation with that in (anti)proton-proton interactions are studied by
exploring the charged particle mean multiplicity collision-energy and
centrality dependencies in the measurements to date. The study is performed in
the framework of the recently proposed effective-energy approach which, under
the proper scaling of the collision energy, combines the constituent quark
picture with Landau relativistic hydrodynamics counting for the
centrality-defined effective energy of participants and relating different
types of collisions. Within this approach, the multiplicity energy dependence
and the pseudorapidity spectra from the most central nuclear collisions are
well reproduced. The study of the multiplicity centrality dependence reveals a
new scaling between the measured pseudorapidity spectra and the calculations.
By means of this scaling, called the energy balanced limiting fragmentation
scaling, one reproduces the pseudorapidity spectra for all centralities. The
scaling elucidates some differences in the multiplicity and midrapidity density
centrality dependence obtained at RHIC and LHC. These findings reveal an
inherent similarity in the multiplicity energy dependence from the most central
collisions and centrality data. A new regime in heavy-ion collisions to occur
at about a TeV energy is indicated, similar to that observed in the earlier
studies of the midrapidity densities. Predictions are made for the mean
multiplicities to be measured in proton-proton and heavy-ion collisions at the
LHC.
| [
{
"created": "Tue, 30 Jun 2015 13:34:42 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2016 18:05:36 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Apr 2016 13:17:00 GMT",
"version": "v3"
}
] | 2016-04-05 | [
[
"Sarkisyan",
"Edward K. G.",
""
],
[
"Mishra",
"Aditya Nath",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Sakharov",
"Alexander S.",
""
]
] | The multihadron production in nucleus-nucleus collisions and its interrelation with that in (anti)proton-proton interactions are studied by exploring the charged particle mean multiplicity collision-energy and centrality dependencies in the measurements to date. The study is performed in the framework of the recently proposed effective-energy approach which, under the proper scaling of the collision energy, combines the constituent quark picture with Landau relativistic hydrodynamics counting for the centrality-defined effective energy of participants and relating different types of collisions. Within this approach, the multiplicity energy dependence and the pseudorapidity spectra from the most central nuclear collisions are well reproduced. The study of the multiplicity centrality dependence reveals a new scaling between the measured pseudorapidity spectra and the calculations. By means of this scaling, called the energy balanced limiting fragmentation scaling, one reproduces the pseudorapidity spectra for all centralities. The scaling elucidates some differences in the multiplicity and midrapidity density centrality dependence obtained at RHIC and LHC. These findings reveal an inherent similarity in the multiplicity energy dependence from the most central collisions and centrality data. A new regime in heavy-ion collisions to occur at about a TeV energy is indicated, similar to that observed in the earlier studies of the midrapidity densities. Predictions are made for the mean multiplicities to be measured in proton-proton and heavy-ion collisions at the LHC. |
2308.05215 | Gabriele Levati | Luca Di Luzio, Gabriele Levati, Paride Paradisi, Xavier Ponce D\'iaz | Flavour constraints on light spin-1 bosons within a chiral Lagrangian
approach | 15 pages, 5 figures, 1 table | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We discuss the construction of the chiral Lagrangian for a light spin-1
boson, here denoted as $X$, featuring both vector and axial-vector couplings to
light $u,d,s$ quarks. Focusing on $\Delta S = 1$ transitions, we show that
there are model-independent tree-level contributions to $K^\pm \to \pi^\pm X$,
sourced by Standard Model charged currents, which receive an $m^2_K / m_X^2$
enhancement from the emission of a longitudinally polarized $X$. This flavour
observable sets the strongest to date model-independent bound on the diagonal
axial-vector couplings of $X$ to $u,d,s$ quarks for $m_X < m_K - m_\pi$,
superseding the bounds arising from beam-dump and collider searches.
| [
{
"created": "Wed, 9 Aug 2023 20:35:06 GMT",
"version": "v1"
}
] | 2023-08-11 | [
[
"Di Luzio",
"Luca",
""
],
[
"Levati",
"Gabriele",
""
],
[
"Paradisi",
"Paride",
""
],
[
"Díaz",
"Xavier Ponce",
""
]
] | We discuss the construction of the chiral Lagrangian for a light spin-1 boson, here denoted as $X$, featuring both vector and axial-vector couplings to light $u,d,s$ quarks. Focusing on $\Delta S = 1$ transitions, we show that there are model-independent tree-level contributions to $K^\pm \to \pi^\pm X$, sourced by Standard Model charged currents, which receive an $m^2_K / m_X^2$ enhancement from the emission of a longitudinally polarized $X$. This flavour observable sets the strongest to date model-independent bound on the diagonal axial-vector couplings of $X$ to $u,d,s$ quarks for $m_X < m_K - m_\pi$, superseding the bounds arising from beam-dump and collider searches. |
0711.2184 | Markus Diehl | Markus Diehl and Wolfgang Kugler | Some numerical studies of the evolution of generalized parton
distributions | 12 pages, 12 figures. v2: added comments on power-law behavior | Phys.Lett.B660:202-211,2008 | 10.1016/j.physletb.2007.12.047 | DESY 07-195 | hep-ph | null | We study the evolution behavior of generalized parton distributions at small
longitudinal momentum fraction. Particular attention is paid to the ratio of a
generalized parton distribution and its forward limit, to the mixing between
quarks and gluons, and to the dependence on the squared momentum transfer t.
| [
{
"created": "Wed, 14 Nov 2007 13:06:42 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2008 15:24:34 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Diehl",
"Markus",
""
],
[
"Kugler",
"Wolfgang",
""
]
] | We study the evolution behavior of generalized parton distributions at small longitudinal momentum fraction. Particular attention is paid to the ratio of a generalized parton distribution and its forward limit, to the mixing between quarks and gluons, and to the dependence on the squared momentum transfer t. |
1005.1010 | Eef van Beveren | Eef van Beveren, George Rupp and J. Segovia | A very broad X(4260) and the resonance parameters of the 3D vector
charmonium state | 4 pages, 5 figures; version 2: 2 figures replaced | Phys.Rev.Lett.105:102001,2010 | 10.1103/PhysRevLett.105.102001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the X(4260) enhancement contains a wealth of information on
vector c-cbar spectroscopy. We discuss the shape of the X(4260) observed in the
OZI-forbidden process "electron-positron into J/psi and a pair of charged
pions", in particular at and near vector charmonium resonances as well as
open-charm threshold enhancements. The resulting very broad X(4260) structure
does not seem to classify itself as a vector charmonium resonance, but its
detailed shape allows to identify new vector c-cbar states. Here, we estimate
the resonance parameters of the psi(3D) state.
| [
{
"created": "Thu, 6 May 2010 14:34:01 GMT",
"version": "v1"
},
{
"created": "Fri, 7 May 2010 05:13:56 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
],
[
"Segovia",
"J.",
""
]
] | We argue that the X(4260) enhancement contains a wealth of information on vector c-cbar spectroscopy. We discuss the shape of the X(4260) observed in the OZI-forbidden process "electron-positron into J/psi and a pair of charged pions", in particular at and near vector charmonium resonances as well as open-charm threshold enhancements. The resulting very broad X(4260) structure does not seem to classify itself as a vector charmonium resonance, but its detailed shape allows to identify new vector c-cbar states. Here, we estimate the resonance parameters of the psi(3D) state. |
1303.3282 | Wynn C. G. Ho | Wynn C. G. Ho, Nils Andersson, Cristobal M. Espinoza, Kostas
Glampedakis, Brynmor Haskell, and Craig O. Heinke | The hottest superfluid and superconductor in the Universe: Discovery and
nuclear physics implications | 8 pages, 4 figures; Proceedings of Xth Quark Confinement and the
Hadron Spectrum, M. Berwein, N. Brambilla, S. Paul (eds.); v2 same as v1;
correction to editor list | PoS (Confinement X) 260 (2013) | null | null | hep-ph astro-ph.SR nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present recent work on using astronomical observations of neutron stars to
reveal unique insights into nuclear matter that cannot be obtained from
laboratories on Earth. First, we discuss our measurement of the rapid cooling
of the youngest neutron star in the Galaxy; this provides the first direct
evidence for superfluidity and superconductivity in the supra-nuclear core of
neutron stars. We show that observations of thermonuclear X-ray bursts on
neutron stars can be used to constrain properties of neutron superfluidity and
neutrino emission. We describe the implications of rapid neutron star rotation
rates on aspects of nuclear and superfluid physics. Finally, we show that
entrainment coupling between the neutron superfluid and the nuclear lattice
leads to a less mobile crust superfluid; this result puts into question the
conventional picture of pulsar glitches as being solely due to the crust
superfluid and suggests that the core superfluid also participates.
| [
{
"created": "Wed, 13 Mar 2013 20:23:06 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Mar 2013 13:17:29 GMT",
"version": "v2"
}
] | 2013-03-18 | [
[
"Ho",
"Wynn C. G.",
""
],
[
"Andersson",
"Nils",
""
],
[
"Espinoza",
"Cristobal M.",
""
],
[
"Glampedakis",
"Kostas",
""
],
[
"Haskell",
"Brynmor",
""
],
[
"Heinke",
"Craig O.",
""
]
] | We present recent work on using astronomical observations of neutron stars to reveal unique insights into nuclear matter that cannot be obtained from laboratories on Earth. First, we discuss our measurement of the rapid cooling of the youngest neutron star in the Galaxy; this provides the first direct evidence for superfluidity and superconductivity in the supra-nuclear core of neutron stars. We show that observations of thermonuclear X-ray bursts on neutron stars can be used to constrain properties of neutron superfluidity and neutrino emission. We describe the implications of rapid neutron star rotation rates on aspects of nuclear and superfluid physics. Finally, we show that entrainment coupling between the neutron superfluid and the nuclear lattice leads to a less mobile crust superfluid; this result puts into question the conventional picture of pulsar glitches as being solely due to the crust superfluid and suggests that the core superfluid also participates. |
hep-ph/0301211 | Yvonne Wong | C. N. Leung, Yvonne Y. Y. Wong | T-violation in flavour oscillations as a test for relativity principles
at a neutrino factory | RevTeX4, 10 pages, 11 figures; To appear in PRD; v2: two references
added | Phys.Rev.D67:056005,2003 | 10.1103/PhysRevD.67.056005 | null | hep-ph | null | We study the effects of violation of the equivalence principle (VEP) or
violation of Lorentz invariance (LIV) in the neutrino sector on the asymmetry
between T-conjugate oscillation probabilities, $\Delta P_T \equiv
P(\nu_{\alpha} \to \nu_{\beta}) - P(\nu_{\beta} \to \nu_{\alpha})$, in a
three-flavour framework. We find that additional mixing due to these
mechanisms, while obeying all present bounds, can lead to an observable
enhancement, suppression, and/or sign change in $\Delta P_T$ for the preferred
energies and baselines of a neutrino factory. The measurement of this asymmetry
can be used to establish a new upper limit of order $10^{-26}$ on VEP or LIV in
the $(\nu_e, \nu_\mu)$ and $(\nu_e, \nu_\tau)$ sectors.
| [
{
"created": "Thu, 23 Jan 2003 19:43:38 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 2003 00:25:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Leung",
"C. N.",
""
],
[
"Wong",
"Yvonne Y. Y.",
""
]
] | We study the effects of violation of the equivalence principle (VEP) or violation of Lorentz invariance (LIV) in the neutrino sector on the asymmetry between T-conjugate oscillation probabilities, $\Delta P_T \equiv P(\nu_{\alpha} \to \nu_{\beta}) - P(\nu_{\beta} \to \nu_{\alpha})$, in a three-flavour framework. We find that additional mixing due to these mechanisms, while obeying all present bounds, can lead to an observable enhancement, suppression, and/or sign change in $\Delta P_T$ for the preferred energies and baselines of a neutrino factory. The measurement of this asymmetry can be used to establish a new upper limit of order $10^{-26}$ on VEP or LIV in the $(\nu_e, \nu_\mu)$ and $(\nu_e, \nu_\tau)$ sectors. |
1212.3732 | Anatoly Kotikov Vassilievich | A. V. Kotikov | The property of maximal transcendentality: calculation of master
integrals | 12 pages, 3 figures, talk given at the IV International Conference
"Models in Quantum Field Theory" (MQFT-2012), September 24-27, 2012, V.A.
Fock Physical Research Institute, Petergof, Russia | null | 10.1007/s11232-013-0079-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the results having the property of maximal transcendentality.
| [
{
"created": "Sat, 15 Dec 2012 21:26:29 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Kotikov",
"A. V.",
""
]
] | We review the results having the property of maximal transcendentality. |
hep-ph/9905218 | Francesco Hautmann | F. Hautmann, Z. Kunszt and D.E. Soper | Hard diffraction from small-size color sources | 6 pages, 5 figures, talk presented at DPF '99 | null | null | null | hep-ph | null | We describe diffractive hard processes in the framework of QCD factorization
and discuss what one can learn from the study of hadronic systems with small
transverse size.
| [
{
"created": "Mon, 3 May 1999 21:42:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hautmann",
"F.",
""
],
[
"Kunszt",
"Z.",
""
],
[
"Soper",
"D. E.",
""
]
] | We describe diffractive hard processes in the framework of QCD factorization and discuss what one can learn from the study of hadronic systems with small transverse size. |
1603.05388 | Li-Sheng Geng | Jun-Xu Lu, Hua-Xing Chen, Zhi-Hui Guo, J. Nieves, Ju-Jun Xie, Li-Sheng
Geng | The $\Lambda_c(2595)$ resonance as a dynamically generated state: the
compositeness condition and the large $N_c$ evolution | 33 pages, 2 figures | Phys. Rev. D 93, 114028 (2016) | 10.1103/PhysRevD.93.114028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent studies have shown that the well established $\Lambda_c(2595)$
resonance contains a large meson-baryon component, which can vary depending on
the specific formalism. In this work, we examine such a picture by utilizing
the compositeness condition and the large number of colors ($N_c$) expansion.
We examine three different models fulfilling two body unitarity in
coupled-channels, and adopting renormalization schemes where the mass of the
$\Lambda_c(2595)$ resonance is well described, but not necessarily its width,
since we do not consider three body channels and work at the isospin symmetric
limit. Both approximations might have an effect larger on the width than on the
mass. In this context, our studies show that the compositeness of the
$\Lambda_c(2595)$ depends on the number of considered coupled channels, and on
the particular regularization scheme adopted in the unitary approaches and,
therefore, is model dependent. In addition, we perform an exploratory study of
the $\Lambda_c(2595)$ in the large $N_c$ expansion, within a scheme involving
only the $\pi\Sigma_c$ and $K\Xi'_c$ channels, whose dynamics is mostly fixed
by chiral symmetry. In this context and formulating the leading-order
interaction as a function of $N_c$, we show that for moderate $N_c> 3$ values,
the mass and width of the $\Lambda_c(2595)$ deviate from those of a genuine
$qqq$ baryon, implying the relevance of meson-baryon components in its wave
function. Furthermore, we study the properties of the $\Lambda_c(2595)$, in the
strict $N_c \to \infty $ limit, using an extension of the chiral
Weinberg-Tomozawa interaction to an arbitrary number of flavors and colors.
This latter study hints at the possible existence of a (perhaps) sub-dominant
$qqq$ component in the $\Lambda_c(2595)$ resonance wave function, which would
become dominant when the number of colors gets sufficiently large.
| [
{
"created": "Thu, 17 Mar 2016 08:31:30 GMT",
"version": "v1"
}
] | 2016-06-29 | [
[
"Lu",
"Jun-Xu",
""
],
[
"Chen",
"Hua-Xing",
""
],
[
"Guo",
"Zhi-Hui",
""
],
[
"Nieves",
"J.",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Geng",
"Li-Sheng",
""
]
] | Recent studies have shown that the well established $\Lambda_c(2595)$ resonance contains a large meson-baryon component, which can vary depending on the specific formalism. In this work, we examine such a picture by utilizing the compositeness condition and the large number of colors ($N_c$) expansion. We examine three different models fulfilling two body unitarity in coupled-channels, and adopting renormalization schemes where the mass of the $\Lambda_c(2595)$ resonance is well described, but not necessarily its width, since we do not consider three body channels and work at the isospin symmetric limit. Both approximations might have an effect larger on the width than on the mass. In this context, our studies show that the compositeness of the $\Lambda_c(2595)$ depends on the number of considered coupled channels, and on the particular regularization scheme adopted in the unitary approaches and, therefore, is model dependent. In addition, we perform an exploratory study of the $\Lambda_c(2595)$ in the large $N_c$ expansion, within a scheme involving only the $\pi\Sigma_c$ and $K\Xi'_c$ channels, whose dynamics is mostly fixed by chiral symmetry. In this context and formulating the leading-order interaction as a function of $N_c$, we show that for moderate $N_c> 3$ values, the mass and width of the $\Lambda_c(2595)$ deviate from those of a genuine $qqq$ baryon, implying the relevance of meson-baryon components in its wave function. Furthermore, we study the properties of the $\Lambda_c(2595)$, in the strict $N_c \to \infty $ limit, using an extension of the chiral Weinberg-Tomozawa interaction to an arbitrary number of flavors and colors. This latter study hints at the possible existence of a (perhaps) sub-dominant $qqq$ component in the $\Lambda_c(2595)$ resonance wave function, which would become dominant when the number of colors gets sufficiently large. |
1503.01325 | Patrick Janot | Patrick Janot | Top-quark electroweak couplings at the FCC-ee | 18 pages, 5 figures. To be published in JHEP (accepted for
publication). Between version 2 and version 3, the suggestions of the JHEP
referee were implemented both in the text (in Sections "Results and
discussion" and "Summary and outlook") and in Figures 3 and 5 | null | 10.1007/JHEP04(2015)182 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An optimal-observable analysis of the lepton angular and energy distributions
from top-quark pair production with semi-leptonic decays in e+e- collisions is
used to predict the potential sensitivity of the FCC-ee to the couplings of the
top quark to the photon and the Z.
| [
{
"created": "Wed, 4 Mar 2015 14:53:07 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2015 10:45:29 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Apr 2015 08:27:34 GMT",
"version": "v3"
}
] | 2015-06-11 | [
[
"Janot",
"Patrick",
""
]
] | An optimal-observable analysis of the lepton angular and energy distributions from top-quark pair production with semi-leptonic decays in e+e- collisions is used to predict the potential sensitivity of the FCC-ee to the couplings of the top quark to the photon and the Z. |
0809.2472 | Andrei Leonidov | I.M. Dremin, M.R. Kirakosyan, A.V. Leonidov, A.V. Vinogradov | Cherenkov Glue in Opaque Nuclear Medium | null | Nucl.Phys.A826:190-197,2009 | 10.1016/j.nuclphysa.2009.05.003 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spectrum of Cherenkov gluons is calculated within the framework of
in-medium QCD. It is compared with experimental data on the double-humped
structure around the away-side jet obtained at RHIC. The values of the real and
imaginary parts of the nuclear permittivity are obtained from these fits. It is
shown that accounting for an additional smearing due to resonance-like
production of final hadrons allows to achieve an agreement with experimental
data.
| [
{
"created": "Mon, 15 Sep 2008 10:03:27 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2008 17:36:08 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Sep 2008 03:27:42 GMT",
"version": "v3"
},
{
"created": "Fri, 22 May 2009 11:34:43 GMT",
"version": "v4"
}
] | 2010-06-03 | [
[
"Dremin",
"I. M.",
""
],
[
"Kirakosyan",
"M. R.",
""
],
[
"Leonidov",
"A. V.",
""
],
[
"Vinogradov",
"A. V.",
""
]
] | The spectrum of Cherenkov gluons is calculated within the framework of in-medium QCD. It is compared with experimental data on the double-humped structure around the away-side jet obtained at RHIC. The values of the real and imaginary parts of the nuclear permittivity are obtained from these fits. It is shown that accounting for an additional smearing due to resonance-like production of final hadrons allows to achieve an agreement with experimental data. |
hep-ph/0410337 | Yong-Yeon Keum | Yong-Yeon Keum | Phenomenological Application of $k_T$ factorization | 26 pages with revtex4, 13 figures; Added references and corrected
typos. Invited plenary talk at the Workshop on High Energy Physics
Phenomenology (WHEPP8) India, Institute of Technology, Mumbai (India) January
5-16,2004; To be published in PRAMANA, journal of physics Dec. 2004, Indian
Academy of Sciences | Pramana63:1151-1170,2004 | 10.1007/BF02704888 | null | hep-ph hep-ex | null | We discuss applications of the perturbative QCD approach in the exclusive
non-leptonic two body B-meson decays. We briefly review its ingredients and
some important theoretical issues on the factorization approaches. PQCD results
are compatible with present experimantal data for the charmless B-meson decays.
We predict the possibility of large direct CP asymmetry in $B^0 \to
\pi^{+}\pi^{-}$ $(23\pm7 %)$ and $B^0\to K^{+}\pi^{-}$ $(-17\pm5%)$. We also
investigate the Branching ratios, CP asymmetry and isopsin symmetry breaking in
radiative $B \to (K^*/\rho) \gamma$ decays.
| [
{
"created": "Mon, 25 Oct 2004 17:12:30 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Nov 2004 19:16:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Keum",
"Yong-Yeon",
""
]
] | We discuss applications of the perturbative QCD approach in the exclusive non-leptonic two body B-meson decays. We briefly review its ingredients and some important theoretical issues on the factorization approaches. PQCD results are compatible with present experimantal data for the charmless B-meson decays. We predict the possibility of large direct CP asymmetry in $B^0 \to \pi^{+}\pi^{-}$ $(23\pm7 %)$ and $B^0\to K^{+}\pi^{-}$ $(-17\pm5%)$. We also investigate the Branching ratios, CP asymmetry and isopsin symmetry breaking in radiative $B \to (K^*/\rho) \gamma$ decays. |
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