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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2212.03561 | Hai-Bing Fu | Zai-Hui Wu, Hai-Bing Fu, Tao Zhong, Yu Chen, Ya-Hong Dai | Searching for $a_0(980)$-meson parton distribution function | 7 pages, 3 figures, comments welcome | null | 10.1088/1572-9494/ace038 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we calculate the scalar $a_0(980)$-meson leading-twist
wavefunction by using light-cone harmonic oscillator model (LCHO). In which the
model parameters are determined by fitting the $\xi$-moments
$\langle\xi_{a_0}^n\rangle_\zeta$ of its light-cone distribution amplitudes.
Then, the $a_0(980)$-meson leading-twist light-cone distribution amplitudes
with three different scales $\zeta= (1.0, 2.0, 5.2)~{\rm GeV}$ are given. After
constructing the relationship between $a_0(980)$-meson leading-twist parton
distribution functions/valence quark distribution function and its LCHO
wavefunction, we exhibit the $q^{a_0}(x,\zeta)$ and $x q^{a_0}(x,\zeta)$ with
different scales. Furthermore, we also calculate the Mellin moments of the
$a_0(980)$-meson's valence quark distribution function $\langle x^n
q^{a_0}\rangle_\zeta$ with $n = (1,2,3)$, i.e. $\langle x
q^{a_0}\rangle_{\zeta_5} = 0.026$, $\langle x^2 q^{a_0}\rangle_{\zeta_5} =
0.017$ and $\langle x^3 q^{a_0}\rangle_{\zeta_5} = 0.012$. Finally, the scale
evolution for the ratio of the Mellin moments $x^n_{a_0}(\zeta,\zeta_k)$ are
presented.
| [
{
"created": "Wed, 7 Dec 2022 10:27:48 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Wu",
"Zai-Hui",
""
],
[
"Fu",
"Hai-Bing",
""
],
[
"Zhong",
"Tao",
""
],
[
"Chen",
"Yu",
""
],
[
"Dai",
"Ya-Hong",
""
]
] | In this paper, we calculate the scalar $a_0(980)$-meson leading-twist wavefunction by using light-cone harmonic oscillator model (LCHO). In which the model parameters are determined by fitting the $\xi$-moments $\langle\xi_{a_0}^n\rangle_\zeta$ of its light-cone distribution amplitudes. Then, the $a_0(980)$-meson leading-twist light-cone distribution amplitudes with three different scales $\zeta= (1.0, 2.0, 5.2)~{\rm GeV}$ are given. After constructing the relationship between $a_0(980)$-meson leading-twist parton distribution functions/valence quark distribution function and its LCHO wavefunction, we exhibit the $q^{a_0}(x,\zeta)$ and $x q^{a_0}(x,\zeta)$ with different scales. Furthermore, we also calculate the Mellin moments of the $a_0(980)$-meson's valence quark distribution function $\langle x^n q^{a_0}\rangle_\zeta$ with $n = (1,2,3)$, i.e. $\langle x q^{a_0}\rangle_{\zeta_5} = 0.026$, $\langle x^2 q^{a_0}\rangle_{\zeta_5} = 0.017$ and $\langle x^3 q^{a_0}\rangle_{\zeta_5} = 0.012$. Finally, the scale evolution for the ratio of the Mellin moments $x^n_{a_0}(\zeta,\zeta_k)$ are presented. |
1908.03227 | Graham White Dr | Jeff A. Dror, Takashi Hiramatsu, Kazunori Kohri, Hitoshi Murayama and
Graham White | Testing Seesaw and Leptogenesis with Gravitational Waves | 6 pages, 1 figures, published version | Phys. Rev. Lett. 124, 041804 (2020) | 10.1103/PhysRevLett.124.041804 | IPMU19-0108, DESY 19-138, KEK-TH-2147, KEK-Cosmo-241 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the possibility that the seesaw mechanism with thermal
leptogenesis can be tested using the stochastic gravitational background.
Achieving neutrino masses consistent with atmospheric and solar neutrino data,
while avoiding non-perturbative couplings, requires right-neutrinos lighter
than the typical scale of grand unification. This scale separation suggests a
symmetry protecting the right handed neutrinos from getting a mass. Thermal
leptogenesis would then require that such a symmetry be broken below the
reheating temperature. We enumerate all such possible symmetries consistent
with these minimal assumptions and their corresponding defects, finding that in
many cases, gravitational waves from the network of cosmic strings should be
detectable. Estimating the predicted gravitational wave background we find that
future space-borne missions could probe the entire range relevant for thermal
leptogenesis.
| [
{
"created": "Thu, 8 Aug 2019 18:09:19 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2020 15:48:26 GMT",
"version": "v2"
}
] | 2020-03-11 | [
[
"Dror",
"Jeff A.",
""
],
[
"Hiramatsu",
"Takashi",
""
],
[
"Kohri",
"Kazunori",
""
],
[
"Murayama",
"Hitoshi",
""
],
[
"White",
"Graham",
""
]
] | We present the possibility that the seesaw mechanism with thermal leptogenesis can be tested using the stochastic gravitational background. Achieving neutrino masses consistent with atmospheric and solar neutrino data, while avoiding non-perturbative couplings, requires right-neutrinos lighter than the typical scale of grand unification. This scale separation suggests a symmetry protecting the right handed neutrinos from getting a mass. Thermal leptogenesis would then require that such a symmetry be broken below the reheating temperature. We enumerate all such possible symmetries consistent with these minimal assumptions and their corresponding defects, finding that in many cases, gravitational waves from the network of cosmic strings should be detectable. Estimating the predicted gravitational wave background we find that future space-borne missions could probe the entire range relevant for thermal leptogenesis. |
hep-ph/9712334 | Abdelhak Djouadi | Abdelhak Djouadi (LPM Montpellier) | Decays of the Higgs Bosons | 26 pages, latex, 9 figures | null | null | PM-97/51 | hep-ph | null | We review the decay modes of the Standard Model Higgs boson and those of the
neutral and charged Higgs particles of the Minimal Supersymmetric extension of
the Standard Model. Special emphasis will be put on higher-order effects. [Talk
given at the International Workshop on Quantum Effects in the MSSM. Barcelona,
Spain, September 9-13, 1997.]
| [
{
"created": "Wed, 10 Dec 1997 19:17:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Djouadi",
"Abdelhak",
"",
"LPM Montpellier"
]
] | We review the decay modes of the Standard Model Higgs boson and those of the neutral and charged Higgs particles of the Minimal Supersymmetric extension of the Standard Model. Special emphasis will be put on higher-order effects. [Talk given at the International Workshop on Quantum Effects in the MSSM. Barcelona, Spain, September 9-13, 1997.] |
hep-ph/0508192 | Yu-Xin Liu | Lei Chang, Yu-xin Liu, and Hua Guo | Pion-nucleon Sigma Term in the Global Color Model of QCD | 17 pages, 3 figures | Phys.Rev. D72 (2005) 094023 | 10.1103/PhysRevD.72.094023 | null | hep-ph | null | We study the pion-nucleon sigma term in vacuum and in nuclear matter in the
framework of global color model of QCD. With the effective gluon propagator
being taken as the $\delta$-function in momentum space of Munczek-Nomirovsky
model, we estimate that the sigma term at chiral limit in the vacuum is 9/2
times the current quark mass and it decreases with the nuclear matter density.
With the presently obtained in-medium pion-nucleon sigma term, we study the
in-medium chiral quark condensate and obtain a reasonable variation behavior
against the nuclear matter density.
| [
{
"created": "Thu, 18 Aug 2005 09:40:29 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Nov 2005 01:23:03 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Chang",
"Lei",
""
],
[
"Liu",
"Yu-xin",
""
],
[
"Guo",
"Hua",
""
]
] | We study the pion-nucleon sigma term in vacuum and in nuclear matter in the framework of global color model of QCD. With the effective gluon propagator being taken as the $\delta$-function in momentum space of Munczek-Nomirovsky model, we estimate that the sigma term at chiral limit in the vacuum is 9/2 times the current quark mass and it decreases with the nuclear matter density. With the presently obtained in-medium pion-nucleon sigma term, we study the in-medium chiral quark condensate and obtain a reasonable variation behavior against the nuclear matter density. |
hep-ph/0101277 | Elvio Disalvo | Elvio Di Salvo | Transverse Spin Asymmetries in Drell-Yan Processes: $\mathbf
p^{\uparrow} p \to \mu^+ \mu^- X$} | null | Eur.Phys.J.C19:503-515,2001 | 10.1007/s100520100619 | GEF-Th-2/00 | hep-ph | null | We consider two different spin asymmetries in Drell-Yan processes generated
by the collisions of an unpolarized proton beam on transversely polarized
protons: the muon helicity asymmetry and the left-right asymmetry. We calculate
the asymmetries in the framework of the QCD improved parton model, taking into
account the parton transverse momentum and considering the first order QCD
corrections. The muon helicity asymmetry is sensitive to the quark transversity
distribution and is nonvanishing even at zero order. On the contrary the
left-right asymmetry vanishes at zero order but not at first order in the QCD
coupling constant, as a result of gluon contribution.
| [
{
"created": "Wed, 24 Jan 2001 17:23:47 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Di Salvo",
"Elvio",
""
]
] | We consider two different spin asymmetries in Drell-Yan processes generated by the collisions of an unpolarized proton beam on transversely polarized protons: the muon helicity asymmetry and the left-right asymmetry. We calculate the asymmetries in the framework of the QCD improved parton model, taking into account the parton transverse momentum and considering the first order QCD corrections. The muon helicity asymmetry is sensitive to the quark transversity distribution and is nonvanishing even at zero order. On the contrary the left-right asymmetry vanishes at zero order but not at first order in the QCD coupling constant, as a result of gluon contribution. |
1201.1768 | Jialun Ping | Chengrong Deng, Jialun Ping, Fan Wang | QCD quark cyclobutadiene and light tetraquark spectrum | 10 pages, 4 figures, Some statements are changed | null | 10.1103/PhysRevD.86.114035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The QCD quark cyclobutadiene (ring-like), a new color structure of tetraquark
system, is proposed and studied in the flux tube model with multi-body
confinement potential. The QCD quark cyclobutadiene and other flux tube
structures of tetraquark states have similar energies and they can be regarded
as QCD isomeric compounds. The light tetraquark spectra ($u, d, s$ only) with
ring-like and diquark-antidiquark structures are calculated in the flux tube
model. The results show that many experimental states have the masses close to
the calculated values if they are taken as tetraquark states. The isotensor
states with $J^{PC}=1^{--}$ and $J^{PC}=2^{++}$ are studied and predicted that
the masses are around 1500 MeV. The multi-body interaction plays a important
role to reduce the energy of the multiquark state.
| [
{
"created": "Mon, 9 Jan 2012 14:13:01 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Feb 2012 16:30:00 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Oct 2012 16:51:51 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Deng",
"Chengrong",
""
],
[
"Ping",
"Jialun",
""
],
[
"Wang",
"Fan",
""
]
] | The QCD quark cyclobutadiene (ring-like), a new color structure of tetraquark system, is proposed and studied in the flux tube model with multi-body confinement potential. The QCD quark cyclobutadiene and other flux tube structures of tetraquark states have similar energies and they can be regarded as QCD isomeric compounds. The light tetraquark spectra ($u, d, s$ only) with ring-like and diquark-antidiquark structures are calculated in the flux tube model. The results show that many experimental states have the masses close to the calculated values if they are taken as tetraquark states. The isotensor states with $J^{PC}=1^{--}$ and $J^{PC}=2^{++}$ are studied and predicted that the masses are around 1500 MeV. The multi-body interaction plays a important role to reduce the energy of the multiquark state. |
hep-ph/0403213 | Guohuai Zhu | T. N. Pham, Guohuai Zhu | Power Corrections in Charmless B Decays | references and note added, to appear in Phys. Rev. D | Phys.Rev. D69 (2004) 114016 | 10.1103/PhysRevD.69.114016 | null | hep-ph hep-ex | null | In this paper, we focus on the role of power corrections in QCD
factorization(QCDF) method in charmless two-body nonleptonic $B$ meson decays.
We use the ratio of the branching fraction of $B^+ \to \pi^+ K^{\ast 0}$ to
that of $B^0 \to \pi^- \rho^+$, for which the theoretical uncertainties are
greatly reduced, to show clearly that the power corrections in charmless B
decays are probably large. With other similar ratios considered, for example,
for the $B^0 \to K^- \rho^+$ decay, it is very likely that, among various
sources of power corrections, annihilation topology plays an indispensable role
at least for penguin dominated $\rm PV$ channels. We also consider some
selective ratios of direct CP asymmetries. Among these, we find that, if power
corrections other than the chirally enhanced power corrections and annihilation
topology were negligible, QCDF would predict the direct CP asymmetry of $B \to
\pi^+ \pi^-$ to be about 3 times larger than that of $B \to \pi^\pm K^\mp$,
with opposite sign. Experimentally any significant deviation from this
prediction would suggest either new physics or possibly the importance of
long-distance rescattering effects.
| [
{
"created": "Fri, 19 Mar 2004 13:58:28 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2004 12:56:26 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Pham",
"T. N.",
""
],
[
"Zhu",
"Guohuai",
""
]
] | In this paper, we focus on the role of power corrections in QCD factorization(QCDF) method in charmless two-body nonleptonic $B$ meson decays. We use the ratio of the branching fraction of $B^+ \to \pi^+ K^{\ast 0}$ to that of $B^0 \to \pi^- \rho^+$, for which the theoretical uncertainties are greatly reduced, to show clearly that the power corrections in charmless B decays are probably large. With other similar ratios considered, for example, for the $B^0 \to K^- \rho^+$ decay, it is very likely that, among various sources of power corrections, annihilation topology plays an indispensable role at least for penguin dominated $\rm PV$ channels. We also consider some selective ratios of direct CP asymmetries. Among these, we find that, if power corrections other than the chirally enhanced power corrections and annihilation topology were negligible, QCDF would predict the direct CP asymmetry of $B \to \pi^+ \pi^-$ to be about 3 times larger than that of $B \to \pi^\pm K^\mp$, with opposite sign. Experimentally any significant deviation from this prediction would suggest either new physics or possibly the importance of long-distance rescattering effects. |
0807.0098 | Yoshitaka Hatta | Yoshitaka Hatta and Toshihiro Matsuo | Thermal hadron spectrum in $e^+e^-$ annihilation from gauge/string
duality | 4 pages, revtex4; v2. discussion slightly expanded | Phys.Rev.Lett.102:062001,2009 | 10.1103/PhysRevLett.102.062001 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the inclusive spectrum of produced particles in e+e- annihilation
in confining gauge theories that have a gravity dual and show that the momentum
distribution exhibits the thermal behavior.
| [
{
"created": "Tue, 1 Jul 2008 10:03:53 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Oct 2008 12:39:48 GMT",
"version": "v2"
}
] | 2009-02-27 | [
[
"Hatta",
"Yoshitaka",
""
],
[
"Matsuo",
"Toshihiro",
""
]
] | We compute the inclusive spectrum of produced particles in e+e- annihilation in confining gauge theories that have a gravity dual and show that the momentum distribution exhibits the thermal behavior. |
hep-ph/9502417 | null | David H. Lyth and Ewan D. Stewart | Cosmology with a TeV mass GUT Higgs | 4 pages, revtex | Phys.Rev.Lett. 75 (1995) 201-204 | 10.1103/PhysRevLett.75.201 | LANCASTER-TH/9502 | hep-ph astro-ph gr-qc hep-th | null | The most natural way to break the GUT gauge symmetry is with a Higgs field
whose vacuum expectation value is of order $10^{16}\,\mbox{GeV}$ but whose mass
is of order $10^2$ to $10^3\,\mbox{GeV}$. This can lead to a cosmological
history radically different from what is usually assumed to have occurred
between the standard inflationary and nucleosynthesis epochs, which may solve
the gravitino and Polonyi/moduli problems in a natural way.
| [
{
"created": "Tue, 28 Feb 1995 21:13:26 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Lyth",
"David H.",
""
],
[
"Stewart",
"Ewan D.",
""
]
] | The most natural way to break the GUT gauge symmetry is with a Higgs field whose vacuum expectation value is of order $10^{16}\,\mbox{GeV}$ but whose mass is of order $10^2$ to $10^3\,\mbox{GeV}$. This can lead to a cosmological history radically different from what is usually assumed to have occurred between the standard inflationary and nucleosynthesis epochs, which may solve the gravitino and Polonyi/moduli problems in a natural way. |
2005.07200 | Peter Denton | Asli Abdullahi and Peter B. Denton | Visible Decay of Astrophysical Neutrinos at IceCube | 18 pages, 9 figures, comments welcome! Code available at
https://github.com/PeterDenton/Astro-Nu-Decay; v2: clarifying remarks and
references add, matches published version | Phys. Rev. D 102, 023018 (2020) | 10.1103/PhysRevD.102.023018 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino decay modifies neutrino propagation in a unique way; not only is
there flavor changing as there is in neutrino oscillations, there is also
energy transport from initial to final neutrinos. The most sensitive direct
probe of neutrino decay is currently IceCube which can measure the energy and
flavor of neutrinos traveling over extragalactic distances. For the first time
we calculate the flavor transition probability for the cases of visible and
invisible neutrino decay, including the effects of the expansion of the
universe, and consider the implications for IceCube. As an example, we
demonstrate how neutrino decay addresses a tension in the IceCube data. We also
provide a publicly available code to calculate the effect of visible decay.
| [
{
"created": "Thu, 14 May 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jul 2020 15:12:15 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Abdullahi",
"Asli",
""
],
[
"Denton",
"Peter B.",
""
]
] | Neutrino decay modifies neutrino propagation in a unique way; not only is there flavor changing as there is in neutrino oscillations, there is also energy transport from initial to final neutrinos. The most sensitive direct probe of neutrino decay is currently IceCube which can measure the energy and flavor of neutrinos traveling over extragalactic distances. For the first time we calculate the flavor transition probability for the cases of visible and invisible neutrino decay, including the effects of the expansion of the universe, and consider the implications for IceCube. As an example, we demonstrate how neutrino decay addresses a tension in the IceCube data. We also provide a publicly available code to calculate the effect of visible decay. |
hep-ph/9709384 | Leonid Satarov | I.N. Mishustin, L.M. Satarov, H. Stoecker, W. Greiner | Dilepton production by bremsstrahlung of meson fields in nuclear
collisions | 14 pages | Phys.Rev.C57:2552-2558,1998 | 10.1103/PhysRevC.57.2552 | null | hep-ph | null | We study the bremsstrahlung of virtual omega mesons due to the collective
deceleration of nuclei at the initial stage of an ultrarelativistic heavy-ion
collision. It is shown that electromagnetic decays of these mesons may give an
important contribution to the observed yields of dileptons. Mass spectra of
positron-electron and muon pairs produced in central Au+Au collisions are
calculated under some simplifying assumptions on the space-time variation of
the baryonic current in a nuclear collision process. Comparison with the CERES
data for 160 AGev Pb+Au collisions shows that the proposed mechanism gives a
noticeable fraction of the observed lepton pairs in the intermediate region of
invariant masses. Sensitivity of the dilepton yield to the in-medium
modification of masses and widths of vector mesons is demonstrated.
| [
{
"created": "Wed, 17 Sep 1997 20:30:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mishustin",
"I. N.",
""
],
[
"Satarov",
"L. M.",
""
],
[
"Stoecker",
"H.",
""
],
[
"Greiner",
"W.",
""
]
] | We study the bremsstrahlung of virtual omega mesons due to the collective deceleration of nuclei at the initial stage of an ultrarelativistic heavy-ion collision. It is shown that electromagnetic decays of these mesons may give an important contribution to the observed yields of dileptons. Mass spectra of positron-electron and muon pairs produced in central Au+Au collisions are calculated under some simplifying assumptions on the space-time variation of the baryonic current in a nuclear collision process. Comparison with the CERES data for 160 AGev Pb+Au collisions shows that the proposed mechanism gives a noticeable fraction of the observed lepton pairs in the intermediate region of invariant masses. Sensitivity of the dilepton yield to the in-medium modification of masses and widths of vector mesons is demonstrated. |
1709.09961 | Amir N. Khan | Amir N. Khan, Douglas W. McKay | Probing New Physics in Low Energy Solar Neutrino Oscillation Data | 2 figure, Conference Proceedings (6th CST-MISC Joint Symposium on
Particle Physics -- from Space-time Dynamics to Phenomenology --, Oct. 15-16,
2016, Campus Plaza Kyoto, Kyoto, Japan.) | http://www2.yukawa.kyoto-u.ac.jp/~soken.editorial/sokendenshi/vol26/proceedings2016.pdf | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the effects of nonstandard neutrino interactions in the lower
components of the solar neutrino spectrum which are predominant by the vacuum
oscillations. The recent measurements of Borexino experiment between 2011 and
2015 provide a clean test to study the nonstandard neutrino interactions at the
source (sun) and the at solar detector. In this work, first the possible
standard model parameters are estimated from the combined data of the low
energy regime and then the nonstandard effects at the source, at the detector,
and from the interplay between source and detector parameters are bounded. The
same effects are also investigated for the proposed experiments like LENA and
Jinpin Neutrino Experiment with their projected sensitivities.
| [
{
"created": "Thu, 28 Sep 2017 13:49:23 GMT",
"version": "v1"
}
] | 2017-09-29 | [
[
"Khan",
"Amir N.",
""
],
[
"McKay",
"Douglas W.",
""
]
] | We explore the effects of nonstandard neutrino interactions in the lower components of the solar neutrino spectrum which are predominant by the vacuum oscillations. The recent measurements of Borexino experiment between 2011 and 2015 provide a clean test to study the nonstandard neutrino interactions at the source (sun) and the at solar detector. In this work, first the possible standard model parameters are estimated from the combined data of the low energy regime and then the nonstandard effects at the source, at the detector, and from the interplay between source and detector parameters are bounded. The same effects are also investigated for the proposed experiments like LENA and Jinpin Neutrino Experiment with their projected sensitivities. |
0705.1975 | Sven-Olaf Moch | M. Czakon, A. Mitov and S. Moch | Heavy-quark production in massless quark scattering at two loops in QCD | 17 pages latex, 2 figures | Phys.Lett.B651:147-159,2007 | 10.1016/j.physletb.2007.06.020 | DESY 07-064, SFB/CPP-07-19 | hep-ph | null | We present the two-loop virtual QCD corrections to the production of heavy
quarks in the quark--anti-quark--annihilation channel in the limit when all
kinematical invariants are large compared to the mass of the heavy quark. Our
result is exact up to terms suppressed by powers of the heavy-quark mass. The
derivation is based on a simple relation between massless and massive
scattering amplitudes in gauge theories proposed recently by two of the authors
as well as a direct calculation of the massive amplitude at two loops. The
results presented here form an important part of the next-to-next-to-leading
order QCD contributions to heavy-quark production in hadron-hadron collisions.
| [
{
"created": "Mon, 14 May 2007 16:21:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Czakon",
"M.",
""
],
[
"Mitov",
"A.",
""
],
[
"Moch",
"S.",
""
]
] | We present the two-loop virtual QCD corrections to the production of heavy quarks in the quark--anti-quark--annihilation channel in the limit when all kinematical invariants are large compared to the mass of the heavy quark. Our result is exact up to terms suppressed by powers of the heavy-quark mass. The derivation is based on a simple relation between massless and massive scattering amplitudes in gauge theories proposed recently by two of the authors as well as a direct calculation of the massive amplitude at two loops. The results presented here form an important part of the next-to-next-to-leading order QCD contributions to heavy-quark production in hadron-hadron collisions. |
1412.7603 | Hiroshi Yokoya | Shinya Kanemura, Mariko Kikuchi, Kei Yagyu, Hiroshi Yokoya | LHC Run-I constraint on the mass of doubly charged Higgs bosons in the
same-sign diboson decay scenario | 4 pages, 1 figures; minor modifications | null | 10.1093/ptep/ptv071 | UT-HET-098 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Letter, we study the latest bound on the mass of doubly charged Higgs
bosons, $H^{\pm\pm}$, assuming that they dominantly decay into a diboson. The
new bound is obtained by comparing the inclusive searches for events with a
same-sign dilepton by the ATLAS Collaboration using the latest 20.3 fb$^{-1}$
data at the LHC 8 TeV run with theoretical prediction based on the Higgs
triplet model with next-to-leading order QCD corrections. We find that the
lower mass bound on $H^{\pm\pm}$ is about 84 GeV.
| [
{
"created": "Wed, 24 Dec 2014 05:01:24 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Mar 2015 17:02:46 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Kanemura",
"Shinya",
""
],
[
"Kikuchi",
"Mariko",
""
],
[
"Yagyu",
"Kei",
""
],
[
"Yokoya",
"Hiroshi",
""
]
] | In this Letter, we study the latest bound on the mass of doubly charged Higgs bosons, $H^{\pm\pm}$, assuming that they dominantly decay into a diboson. The new bound is obtained by comparing the inclusive searches for events with a same-sign dilepton by the ATLAS Collaboration using the latest 20.3 fb$^{-1}$ data at the LHC 8 TeV run with theoretical prediction based on the Higgs triplet model with next-to-leading order QCD corrections. We find that the lower mass bound on $H^{\pm\pm}$ is about 84 GeV. |
2210.10022 | Masaki Yamada | Shota Nakagawa, Fuminobu Takahashi, Masaki Yamada, Wen Yin | Axion dark matter from first-order phase transition, and very high
energy photons from GRB 221009A | 7 pages, 1 figure | null | 10.1016/j.physletb.2023.137824 | TU-1172 | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study an axion-like particle (ALP) that experiences the first-order phase
transition with respect to its mass or potential minimum. This can be realized
if the ALP obtains a potential from non-perturbative effects of SU($N$) gauge
theory that is confined via the first-order phase transition, or if the ALP is
trapped in a false vacuum at high temperatures until it starts to oscillate
about the true minimum. The resulting ALP abundance is significantly enhanced
compared to the standard misalignment mechanism, explaining dark matter in a
broader parameter space that is accessible to experiments e.g. IAXO, ALPS-II,
and DM-radio. Furthermore, the viable parameter space includes a region of the
mass $m_a \simeq 10^{-7} - 10^{-8}$ eV and the ALP-photon coupling $g_{a \gamma
\gamma} \simeq 10^{-11} {\rm GeV}^{-1}$ that can explain the recent observation
of very high energy photons from GRB221009A via axion-photon oscillations. The
parameter region suggests that the FOPT can generate the gravitational wave
that explains the NANOGrav hint. If the ALP in this region explains dark
matter, then the ALP has likely experienced a first-order phase transition.
| [
{
"created": "Tue, 18 Oct 2022 17:46:20 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2022 04:49:19 GMT",
"version": "v2"
}
] | 2023-04-05 | [
[
"Nakagawa",
"Shota",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yamada",
"Masaki",
""
],
[
"Yin",
"Wen",
""
]
] | We study an axion-like particle (ALP) that experiences the first-order phase transition with respect to its mass or potential minimum. This can be realized if the ALP obtains a potential from non-perturbative effects of SU($N$) gauge theory that is confined via the first-order phase transition, or if the ALP is trapped in a false vacuum at high temperatures until it starts to oscillate about the true minimum. The resulting ALP abundance is significantly enhanced compared to the standard misalignment mechanism, explaining dark matter in a broader parameter space that is accessible to experiments e.g. IAXO, ALPS-II, and DM-radio. Furthermore, the viable parameter space includes a region of the mass $m_a \simeq 10^{-7} - 10^{-8}$ eV and the ALP-photon coupling $g_{a \gamma \gamma} \simeq 10^{-11} {\rm GeV}^{-1}$ that can explain the recent observation of very high energy photons from GRB221009A via axion-photon oscillations. The parameter region suggests that the FOPT can generate the gravitational wave that explains the NANOGrav hint. If the ALP in this region explains dark matter, then the ALP has likely experienced a first-order phase transition. |
hep-ph/0003214 | Shailesh Chandrasekharan | Shailesh Chandrasekharan (Duke University) and Uwe-Jens Wiese (MIT) | SO(10) Unification of Color Superconductivity and Chiral Symmetry
Breaking? | 4 pages, 2 figures, RevTex | null | null | DUKE-TH-00-203, MIT-CTP-2961 | hep-ph cond-mat.supr-con hep-lat | null | Motivated by the SO(5) theory of high-temperature superconductivity and
antiferromagnetism, we ask if an SO(10) theory unifies color superconductivity
and chiral symmetry breaking in QCD. The transition to the color
superconducting phase would then be analogous to a spin flop transition. While
the spin flop transition generically has a unified SO(3) description, the SO(5)
and SO(10) symmetric fixed points are unstable, at least in (4 - epsilon)
dimensions, and require the fine-tuning of one additional relevant parameter.
If QCD is near the SO(10) fixed point, it has interesting consequences for
heavy ion collisions and neutron stars.
| [
{
"created": "Wed, 22 Mar 2000 02:28:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chandrasekharan",
"Shailesh",
"",
"Duke University"
],
[
"Wiese",
"Uwe-Jens",
"",
"MIT"
]
] | Motivated by the SO(5) theory of high-temperature superconductivity and antiferromagnetism, we ask if an SO(10) theory unifies color superconductivity and chiral symmetry breaking in QCD. The transition to the color superconducting phase would then be analogous to a spin flop transition. While the spin flop transition generically has a unified SO(3) description, the SO(5) and SO(10) symmetric fixed points are unstable, at least in (4 - epsilon) dimensions, and require the fine-tuning of one additional relevant parameter. If QCD is near the SO(10) fixed point, it has interesting consequences for heavy ion collisions and neutron stars. |
2309.02127 | Silvia Ferrario Ravasio | Andrea Banfi, Silvia Ferrario Ravasio, Barbara J\"ager, Alexander
Karlberg, Felix Reichenbach, and Giulia Zanderighi | A POWHEG generator for deep inelastic scattering | 54 pages, 25 figures, code obtainable from
svn://powhegbox.mib.infn.it/trunk/User-Processes-RES/DIS | JHEP02(2024)001 | https://doi.org/10.1007/JHEP02(2024)023 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We present a new event generator for the simulation of both neutral- and
charged-current deep inelastic scattering (DIS) at next-to-leading order in QCD
matched to parton showers using the POWHEG method. Our implementation builds on
the existing POWHEG BOX framework originally designed for hadron-hadron
collisions, supplemented by considerable extensions to account for the
genuinely different kinematics inherent to lepton-hadron collisions. In
particular, we present new momentum mappings that conserve the special
kinematics found in DIS, which we use to modify the POWHEG BOX implementation
of the Frixione-Kunszt-Signer subtraction mechanism. We compare our predictions
to fixed-order and resummed predictions, as well as to data from the HERA ep
collider. Finally we study a few representative distributions for the upcoming
Electron Ion Collider.
| [
{
"created": "Tue, 5 Sep 2023 11:08:01 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2024 18:05:15 GMT",
"version": "v2"
}
] | 2024-02-09 | [
[
"Banfi",
"Andrea",
""
],
[
"Ravasio",
"Silvia Ferrario",
""
],
[
"Jäger",
"Barbara",
""
],
[
"Karlberg",
"Alexander",
""
],
[
"Reichenbach",
"Felix",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We present a new event generator for the simulation of both neutral- and charged-current deep inelastic scattering (DIS) at next-to-leading order in QCD matched to parton showers using the POWHEG method. Our implementation builds on the existing POWHEG BOX framework originally designed for hadron-hadron collisions, supplemented by considerable extensions to account for the genuinely different kinematics inherent to lepton-hadron collisions. In particular, we present new momentum mappings that conserve the special kinematics found in DIS, which we use to modify the POWHEG BOX implementation of the Frixione-Kunszt-Signer subtraction mechanism. We compare our predictions to fixed-order and resummed predictions, as well as to data from the HERA ep collider. Finally we study a few representative distributions for the upcoming Electron Ion Collider. |
1907.12450 | Felix Driencourt-Mangin | Felix Driencourt-Mangin | Four-dimensional representation of scattering amplitudes and physical
observables through the application of the Loop-Tree Duality theorem | PhD. thesis, 181 pages | null | null | null | hep-ph hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis we propose a novel method to compute higher-order corrections
to physical cross sections, bypassing more traditional approaches. This
technique, the Four-Dimensional Unsubtraction (FDU), is based on the Loop-Tree
Duality (LTD) theorem, and aims at building pure four-dimensional
representations of scattering amplitudes at higher orders in perturbation
theory. This is done by locally renormalising the virtual contribution at high
energies, and then mapping the kinematics of the corresponding real
contribution so it matches the virtual one in the soft and collinear limits.
This makes the ultraviolet and infrared singularities vanish at the integrand
level when taking the sum of both contributions, meaning that the
four-dimensional limit can be taken before integrating, thus allowing for a
straightforward numerical implementation. We apply this method for the first
time to calculate the decay of a virtual photon to two massless quarks, and
then generalise the method to massive particles. We also show new advantages
provided by the LTD formalism. One of them is the possibility to write one- and
two-loop scattering amplitudes in a universal form at the integrand level,
regardless of the nature of the particle running inside the loop. The other is
to perform integrand-level asymptotic expansions in the internal mass - without
having to rely on expansion-by-region techniques - by taking advantage of the
Euclidean nature of the integration domain. Finally, we present a new algorithm
to locally renormalise two-loop amplitudes, where the renormalisation scheme
can be easily fixed through subleading contributions in the ultraviolet region.
| [
{
"created": "Mon, 29 Jul 2019 14:12:57 GMT",
"version": "v1"
}
] | 2019-07-30 | [
[
"Driencourt-Mangin",
"Felix",
""
]
] | In this thesis we propose a novel method to compute higher-order corrections to physical cross sections, bypassing more traditional approaches. This technique, the Four-Dimensional Unsubtraction (FDU), is based on the Loop-Tree Duality (LTD) theorem, and aims at building pure four-dimensional representations of scattering amplitudes at higher orders in perturbation theory. This is done by locally renormalising the virtual contribution at high energies, and then mapping the kinematics of the corresponding real contribution so it matches the virtual one in the soft and collinear limits. This makes the ultraviolet and infrared singularities vanish at the integrand level when taking the sum of both contributions, meaning that the four-dimensional limit can be taken before integrating, thus allowing for a straightforward numerical implementation. We apply this method for the first time to calculate the decay of a virtual photon to two massless quarks, and then generalise the method to massive particles. We also show new advantages provided by the LTD formalism. One of them is the possibility to write one- and two-loop scattering amplitudes in a universal form at the integrand level, regardless of the nature of the particle running inside the loop. The other is to perform integrand-level asymptotic expansions in the internal mass - without having to rely on expansion-by-region techniques - by taking advantage of the Euclidean nature of the integration domain. Finally, we present a new algorithm to locally renormalise two-loop amplitudes, where the renormalisation scheme can be easily fixed through subleading contributions in the ultraviolet region. |
hep-ph/9910301 | Aurelio Juste | Aurelio Juste and Gonzalo Merino | Top-Higgs Yukawa Coupling Measurement at a Linear e+e- Collider | LaTex, 27 pages, 14 Postscript figures | null | null | null | hep-ph | null | A feasibility study of the measurement of the top-Higgs Yukawa coupling at a
future linear e+e- collider operating at sqrt(s)=800 GeV is presented. As
compared to previous existing studies, much effort has been put in a
``realistic simulation'' by including irreducible+reducible backgrounds,
realistic detector effects and reconstruction procedures and finally, a
multivariate analysis. Both hadronic and semileptonic decay channels have been
considered.
| [
{
"created": "Tue, 12 Oct 1999 00:58:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Juste",
"Aurelio",
""
],
[
"Merino",
"Gonzalo",
""
]
] | A feasibility study of the measurement of the top-Higgs Yukawa coupling at a future linear e+e- collider operating at sqrt(s)=800 GeV is presented. As compared to previous existing studies, much effort has been put in a ``realistic simulation'' by including irreducible+reducible backgrounds, realistic detector effects and reconstruction procedures and finally, a multivariate analysis. Both hadronic and semileptonic decay channels have been considered. |
1512.06782 | Mansi Dhuria | Mansi Dhuria, Gaurav Goswami | Perturbativity, vacuum stability and inflation in the light of 750 GeV
diphoton excess | 16 pages, 6 figures. Journal version (to appear in Phy. Rev. D) | Phys.Rev. D94 (2016) no.5, 055009 | 10.1103/PhysRevD.94.055009 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent observation of the 750 GeV diphoton excess at 13 TeV LHC has
motivated many scenarios of physics beyond the Standard Model. In this work, we
begin by showing that many models which explain the observed excess tend to get
strongly coupled well below the Planck scale. We then study a simple scenario
involving colored vector-like fermions with exotic charges, which is expected
to stay weakly coupled till the Planck scale. We find the conditions under
which this happens, derive the Renormalization Group equations for such models
and solve them to show that perturbativity till Planck scale can be maintained
for a very reasonable choice of parameters. Finally, we discuss issues related
to vacuum stability and the possibility of inflation in the scenarios we study.
| [
{
"created": "Mon, 21 Dec 2015 19:48:51 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Dec 2015 19:03:52 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Dec 2015 19:51:25 GMT",
"version": "v3"
},
{
"created": "Tue, 5 Jan 2016 18:10:55 GMT",
"version": "v4"
},
{
"created": "Thu, 21 Jul 2016 19:49:18 GMT",
"version": "v5"
}
] | 2016-12-02 | [
[
"Dhuria",
"Mansi",
""
],
[
"Goswami",
"Gaurav",
""
]
] | The recent observation of the 750 GeV diphoton excess at 13 TeV LHC has motivated many scenarios of physics beyond the Standard Model. In this work, we begin by showing that many models which explain the observed excess tend to get strongly coupled well below the Planck scale. We then study a simple scenario involving colored vector-like fermions with exotic charges, which is expected to stay weakly coupled till the Planck scale. We find the conditions under which this happens, derive the Renormalization Group equations for such models and solve them to show that perturbativity till Planck scale can be maintained for a very reasonable choice of parameters. Finally, we discuss issues related to vacuum stability and the possibility of inflation in the scenarios we study. |
hep-ph/0007269 | Anupam Mazumdar | Anupam Mazumdar | Interesting consequences of brane cosmology | 5 pages, Trivial changes to match the published version | Phys.Rev. D64 (2001) 027304 | 10.1103/PhysRevD.64.027304 | null | hep-ph astro-ph gr-qc hep-th | null | We discuss cosmology in four dimensions within a context of brane-world
scenario.Such models can predict chaotic inflation with very low reheat
temperature depending on the brane tension. We notice that the gravitino
abundance is different in the brane-world cosmology and by tuning the brane
tension it is possible to get extremely low abundance. We also study
Affleck-Dine baryogenesis in our toy model.
| [
{
"created": "Mon, 24 Jul 2000 19:29:57 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jul 2000 23:09:55 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Apr 2001 12:07:09 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Mazumdar",
"Anupam",
""
]
] | We discuss cosmology in four dimensions within a context of brane-world scenario.Such models can predict chaotic inflation with very low reheat temperature depending on the brane tension. We notice that the gravitino abundance is different in the brane-world cosmology and by tuning the brane tension it is possible to get extremely low abundance. We also study Affleck-Dine baryogenesis in our toy model. |
2406.00613 | Hao-Song You | Hao-Song You, Hao Sun, Hong-Bo Li, Cheng-Jun Xia and Ren-Xin Xu | Compact dwarfs made of light-quark nuggets | null | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Utilizing an equivparticle model with both linear confinement and
leading-order perturbative interactions, we obtain systematically the
properties of strangelets and nonstrange quark matter ($ud$QM) nuggets at
various baryon ($A$) and charge ($Z$) numbers, where the detailed
single-quark-energy levels are fixed by solving Dirac equations in mean-field
approximation (MFA). We then examine the structures of compact dwarfs made of
light strangelets or $ud$QM nuggets forming body-centered cubic lattices in a
uniform electron background. Despite the strangelets and $ud$QM nuggets
generally become more stable at larger $A$, the compact dwarfs are still stable
since the fusion reactions between those objects do not take place in the
presence of a Coulomb barrier, which is similar to the cases of light nuclei in
normal white dwarfs. If $ud$QM dwarfs or strangelet dwarfs are covered with
normal matter, their masses and radii become larger but do not exceed those of
ordinary white dwarfs. Finally, we investigate the radial oscillation
frequencies of $ud$QM dwarfs and strangelet dwarfs, and find that their
frequencies are typically higher than traditional white dwarfs. The stability
of compact dwarfs are then analysised by examining radial oscillation
frequencies of the fundamental mode, where compact dwarfs covered by normal
matter are still stable.
| [
{
"created": "Sun, 2 Jun 2024 04:05:42 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"You",
"Hao-Song",
""
],
[
"Sun",
"Hao",
""
],
[
"Li",
"Hong-Bo",
""
],
[
"Xia",
"Cheng-Jun",
""
],
[
"Xu",
"Ren-Xin",
""
]
] | Utilizing an equivparticle model with both linear confinement and leading-order perturbative interactions, we obtain systematically the properties of strangelets and nonstrange quark matter ($ud$QM) nuggets at various baryon ($A$) and charge ($Z$) numbers, where the detailed single-quark-energy levels are fixed by solving Dirac equations in mean-field approximation (MFA). We then examine the structures of compact dwarfs made of light strangelets or $ud$QM nuggets forming body-centered cubic lattices in a uniform electron background. Despite the strangelets and $ud$QM nuggets generally become more stable at larger $A$, the compact dwarfs are still stable since the fusion reactions between those objects do not take place in the presence of a Coulomb barrier, which is similar to the cases of light nuclei in normal white dwarfs. If $ud$QM dwarfs or strangelet dwarfs are covered with normal matter, their masses and radii become larger but do not exceed those of ordinary white dwarfs. Finally, we investigate the radial oscillation frequencies of $ud$QM dwarfs and strangelet dwarfs, and find that their frequencies are typically higher than traditional white dwarfs. The stability of compact dwarfs are then analysised by examining radial oscillation frequencies of the fundamental mode, where compact dwarfs covered by normal matter are still stable. |
1909.10511 | Mikhail Sergeenko | Mikhail N. Sergeenko | Light and Heavy Mesons in The Complex Mass Scheme | 12 pages, 2 tables, Presented at NONLINEAR PHENOMENA IN COMPLEX
SYSTEMS, XXVI International Seminar, Chaos, Fractals, Phase Transitions,
Self-organization,May 21--24, 2019, Minsk, Belarus. arXiv admin note: text
overlap with arXiv:1712.02641, arXiv:1703.07766 | null | null | MAXLA-2/19, "Meson'' | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mesons containing light and heavy quarks are studied. Interaction of quarks
is described by the funnel-type potential with the distant dependent strong
coupling, $\alpha_\S(r)$. Free particle hypothesis for the bound state is
developed: quark and antiquark move as free particles in of the bound system.
Relativistic two-body wave equation with position dependent particle masses is
used to describe the flavored $Qq$ systems. Solution of the equation for the
system in the form of a~standing wave is given. Interpolating complex-mass
formula for two exact asymptotic eigenmass expressions is obtained. Mass
spectra for some leading-state flavored mesons are calculated.
| [
{
"created": "Sat, 21 Sep 2019 11:40:55 GMT",
"version": "v1"
}
] | 2019-09-25 | [
[
"Sergeenko",
"Mikhail N.",
""
]
] | Mesons containing light and heavy quarks are studied. Interaction of quarks is described by the funnel-type potential with the distant dependent strong coupling, $\alpha_\S(r)$. Free particle hypothesis for the bound state is developed: quark and antiquark move as free particles in of the bound system. Relativistic two-body wave equation with position dependent particle masses is used to describe the flavored $Qq$ systems. Solution of the equation for the system in the form of a~standing wave is given. Interpolating complex-mass formula for two exact asymptotic eigenmass expressions is obtained. Mass spectra for some leading-state flavored mesons are calculated. |
1603.02376 | Yuki Shimizu | Yuki Shimizu, Daiki Suenaga, Masayasu Harada | Coupled channel analysis of molecule picture of $P_{c}(4380)$ | 7 pages, 9 figures | Phys. Rev. D 93, 114003 (2016) | 10.1103/PhysRevD.93.114003 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a potential obtained by one-pion exchange for the coupled
channel $\Sigma_c^\ast$$\bar{D}$-$\Sigma_c$$\bar{D}^\ast$, and solve the
coupled Schr\"{o}dinger equations to determine the binding energy. We find that
there exists one or two bound states with the binding energy of several MeV
below the threshold of $\Sigma_c^\ast$ and $\bar{D}$, dominantly made from a
$\Sigma_c^\ast$ baryon and a $\bar{D}$ meson, with the size of about $1.5$fm
for wide parameter region. We also study the pentaquark states including a $b$
quark and/or an anti-$b$ quark. We show that there exist pentaquarks including
$c\bar{b}$, $b\bar{c}$ and $b\bar{b}$, all of which lie at about $10$MeV below
the corresponding threshold and have size of about $1.5$fm.
| [
{
"created": "Tue, 8 Mar 2016 04:22:30 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2016 08:51:08 GMT",
"version": "v2"
}
] | 2016-06-15 | [
[
"Shimizu",
"Yuki",
""
],
[
"Suenaga",
"Daiki",
""
],
[
"Harada",
"Masayasu",
""
]
] | We construct a potential obtained by one-pion exchange for the coupled channel $\Sigma_c^\ast$$\bar{D}$-$\Sigma_c$$\bar{D}^\ast$, and solve the coupled Schr\"{o}dinger equations to determine the binding energy. We find that there exists one or two bound states with the binding energy of several MeV below the threshold of $\Sigma_c^\ast$ and $\bar{D}$, dominantly made from a $\Sigma_c^\ast$ baryon and a $\bar{D}$ meson, with the size of about $1.5$fm for wide parameter region. We also study the pentaquark states including a $b$ quark and/or an anti-$b$ quark. We show that there exist pentaquarks including $c\bar{b}$, $b\bar{c}$ and $b\bar{b}$, all of which lie at about $10$MeV below the corresponding threshold and have size of about $1.5$fm. |
1504.05403 | Alfredo Urbano | Marco Fabbrichesi, Alfredo Urbano | Naturalness redux | 13 pages, 5 figures. Minor changes; version accepted for publication
in PRD | Phys. Rev. D 92, 015028 (2015) | 10.1103/PhysRevD.92.015028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The idea of naturalness, as originally conceived, refers only to the finite
renormalization of the Higgs boson mass induced by the introduction of heavier
states. In this respect, naturalness is still a powerful heuristic principle in
model building beyond the standard model whenever new massive states are
coupled to the Higgs field. The most compelling case is provided by the
generation of neutrino masses. In this paper we confront this problem from a
new perspective. The right-handed sector responsible for the seesaw
mechanism---which introduces a large energy threshold above the electroweak
scale---is made supersymmetric to comply with naturalness while the standard
model is left unchanged and non-supersymmetric. Cancellations necessary to the
naturalness requirement break down only at two loops, thus offering the
possibility to increase the right-handed neutrino mass scale up to one order of
magnitude above the usual values allowed by naturalness. If also the weak boson
sector of the standard model is made supersymmetric, cancellations break down
at three loops and the scale of new physics can be further raised. In the
type-I seesaw, this implementation provides right-handed neutrino masses that
are natural and at the same time large enough to give rise to baryogenesis (via
leptogenesis). The model contains a dark matter candidate and distinctive new
physics in the leptonic sector.
| [
{
"created": "Tue, 21 Apr 2015 12:28:03 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jul 2015 19:31:59 GMT",
"version": "v2"
}
] | 2015-08-05 | [
[
"Fabbrichesi",
"Marco",
""
],
[
"Urbano",
"Alfredo",
""
]
] | The idea of naturalness, as originally conceived, refers only to the finite renormalization of the Higgs boson mass induced by the introduction of heavier states. In this respect, naturalness is still a powerful heuristic principle in model building beyond the standard model whenever new massive states are coupled to the Higgs field. The most compelling case is provided by the generation of neutrino masses. In this paper we confront this problem from a new perspective. The right-handed sector responsible for the seesaw mechanism---which introduces a large energy threshold above the electroweak scale---is made supersymmetric to comply with naturalness while the standard model is left unchanged and non-supersymmetric. Cancellations necessary to the naturalness requirement break down only at two loops, thus offering the possibility to increase the right-handed neutrino mass scale up to one order of magnitude above the usual values allowed by naturalness. If also the weak boson sector of the standard model is made supersymmetric, cancellations break down at three loops and the scale of new physics can be further raised. In the type-I seesaw, this implementation provides right-handed neutrino masses that are natural and at the same time large enough to give rise to baryogenesis (via leptogenesis). The model contains a dark matter candidate and distinctive new physics in the leptonic sector. |
1101.0561 | Pavel Nadolsky | Marco Guzzi, Pavel Nadolsky, Edmond Berger, Hung-Liang Lai, Fredrick
Olness, and C.-P. Yuan | CT10 parton distributions and other developments in the global QCD
analysis | 17 pages, 9 figures | null | null | SMU-HEP-10-11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize several projects carried out by the CTEQ global analysis of
parton distribution functions (PDFs) of the proton during 2010. We discuss a
recently released CT10 family of PDFs with a fixed and variable QCD coupling
strength; implementation of combined HERA and Tevatron lepton asymmetry data
sets; theoretical issues associated with the analysis of $W$ charge asymmetry
in PDF fits; PDFs for leading-order shower programs; and constraints on new
color-octet fermions from the hadronic data.
| [
{
"created": "Mon, 3 Jan 2011 16:46:10 GMT",
"version": "v1"
}
] | 2011-01-04 | [
[
"Guzzi",
"Marco",
""
],
[
"Nadolsky",
"Pavel",
""
],
[
"Berger",
"Edmond",
""
],
[
"Lai",
"Hung-Liang",
""
],
[
"Olness",
"Fredrick",
""
],
[
"Yuan",
"C. -P.",
""
]
] | We summarize several projects carried out by the CTEQ global analysis of parton distribution functions (PDFs) of the proton during 2010. We discuss a recently released CT10 family of PDFs with a fixed and variable QCD coupling strength; implementation of combined HERA and Tevatron lepton asymmetry data sets; theoretical issues associated with the analysis of $W$ charge asymmetry in PDF fits; PDFs for leading-order shower programs; and constraints on new color-octet fermions from the hadronic data. |
2308.07814 | Junichiro Kawamura | Junichiro Kawamura and Seodong Shin | Current status on pair-produced muon-philic vectorlike leptons in
multilepton channels at the LHC | 8 pages, 4 figures; ver2 matched to published version | JHEP11(2023)025 | 10.1007/JHEP11(2023)025 | CTPU-PTC-23-38 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In this work, we obtain the current limits on the pair production of
vectorlike leptons decaying to a Standard Model gauge boson and a lepton in the
second generation using the Run-2 data at the LHC. Since there is no dedicated
search, we recast the ATLAS analyses searching for the type-III seesaw heavy
leptons in the multi-lepton channels. There is no limit for the $SU(2)_L$
singlet vectorlike lepton beyond about 100 GeV, while the limit is about 780
GeV for the doublet one. Thus, dedicated searches for the vectorlike leptons
are necessary, especially for the singlet one. We also study the general cases
of the vectorlike lepton decays and future sensitivities at the HL-LHC.
| [
{
"created": "Tue, 15 Aug 2023 14:45:42 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2023 07:15:58 GMT",
"version": "v2"
}
] | 2023-11-09 | [
[
"Kawamura",
"Junichiro",
""
],
[
"Shin",
"Seodong",
""
]
] | In this work, we obtain the current limits on the pair production of vectorlike leptons decaying to a Standard Model gauge boson and a lepton in the second generation using the Run-2 data at the LHC. Since there is no dedicated search, we recast the ATLAS analyses searching for the type-III seesaw heavy leptons in the multi-lepton channels. There is no limit for the $SU(2)_L$ singlet vectorlike lepton beyond about 100 GeV, while the limit is about 780 GeV for the doublet one. Thus, dedicated searches for the vectorlike leptons are necessary, especially for the singlet one. We also study the general cases of the vectorlike lepton decays and future sensitivities at the HL-LHC. |
hep-ph/9904373 | Matthias Steinhauser | M. Steinhauser (Univ. of Bern) | Hadronic contribution to $\alpha(M_Z^2)$ and the anomalous magnetic
moment of the muon | 6 pages, Talk presented at the 17th International Workshop on Weak
Interactions and Neutrinos (WIN99), Cape Town, South Africa, January 24--30,
1999 | null | null | BUTP-99/06 | hep-ph | null | In this contribution recent developments are discussed which lead to a
significant reduction of the error for $\alpha(M_Z^2)$ and $(g-2)_\mu$.
| [
{
"created": "Sat, 17 Apr 1999 13:43:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Steinhauser",
"M.",
"",
"Univ. of Bern"
]
] | In this contribution recent developments are discussed which lead to a significant reduction of the error for $\alpha(M_Z^2)$ and $(g-2)_\mu$. |
hep-ph/0601248 | Thomas Hahn | T. Hahn, M. Rauch | News from FormCalc and LoopTools | 5 pages, to appear in the proceedings of the 7th International
Symposium on Radiative Corrections (RADCOR05), Shonan Village, Japan, 2005 | null | 10.1016/j.nuclphysbps.2006.03.026 | MPP-2006-7 | hep-ph | null | The FormCalc package automates the computation of FeynArts amplitudes up to
one loop including the generation of a Fortran code for the numerical
evaluation of the squared matrix element. Major new or enhanced features in
Version 5 are: iterative build-up of essentially arbitrary phase-spaces
including cuts, convolution with density functions, and uniform treatment of
kinematical variables. The LoopTools library supplies the one-loop integrals
necessary for evaluating the squared matrix element. Its most significant
extensions in Version 2.2 are the five-point family of integrals, and complex
and alternate versions.
| [
{
"created": "Mon, 30 Jan 2006 14:36:06 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Hahn",
"T.",
""
],
[
"Rauch",
"M.",
""
]
] | The FormCalc package automates the computation of FeynArts amplitudes up to one loop including the generation of a Fortran code for the numerical evaluation of the squared matrix element. Major new or enhanced features in Version 5 are: iterative build-up of essentially arbitrary phase-spaces including cuts, convolution with density functions, and uniform treatment of kinematical variables. The LoopTools library supplies the one-loop integrals necessary for evaluating the squared matrix element. Its most significant extensions in Version 2.2 are the five-point family of integrals, and complex and alternate versions. |
2206.10642 | Matt LeBlanc | Matt LeBlanc, Benjamin Nachman, Christof Sauer | Going off topics to demix quark and gluon jets in $\alpha_S$ extractions | 20 pages, 7 figures | J. High Energ. Phys. 2023, 150 (2023) | 10.1007/JHEP02(2023)150 | null | hep-ph hep-ex physics.data-an | http://creativecommons.org/licenses/by/4.0/ | Quantum chromodynamics is the theory of the strong interaction between quarks
and gluons; the coupling strength of the interaction, $\alpha_S$, is the least
precisely-known of all interactions in nature. An extraction of the strong
coupling from the radiation pattern within jets would provide a complementary
approach to conventional extractions from jet production rates and hadronic
event shapes, and would be a key achievement of jet substructure at the Large
Hadron Collider (LHC). Presently, the relative fraction of quark and gluon jets
in a sample is the limiting factor in such extractions, as this fraction is
degenerate with the value of $\alpha_S$ for the most well-understood
observables. To overcome this limitation, we apply recently proposed techniques
to statistically demix multiple mixtures of jets and obtain purified quark and
gluon distributions based on an operational definition. We illustrate that
studying quark and gluon jet substructure separately can significantly improve
the sensitivity of such extractions of the strong coupling. We also discuss how
using machine learning techniques or infrared- and collinear-unsafe information
can improve the demixing performance without the loss of theoretical control.
While theoretical research is required to connect the extract topics with the
quark and gluon objects in cross section calculations, our study illustrates
the potential of demixing to reduce the dominant uncertainty for the $\alpha_S$
extraction from jet substructure at the LHC.
| [
{
"created": "Tue, 21 Jun 2022 18:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2022 13:05:37 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Mar 2023 20:26:42 GMT",
"version": "v3"
}
] | 2023-03-09 | [
[
"LeBlanc",
"Matt",
""
],
[
"Nachman",
"Benjamin",
""
],
[
"Sauer",
"Christof",
""
]
] | Quantum chromodynamics is the theory of the strong interaction between quarks and gluons; the coupling strength of the interaction, $\alpha_S$, is the least precisely-known of all interactions in nature. An extraction of the strong coupling from the radiation pattern within jets would provide a complementary approach to conventional extractions from jet production rates and hadronic event shapes, and would be a key achievement of jet substructure at the Large Hadron Collider (LHC). Presently, the relative fraction of quark and gluon jets in a sample is the limiting factor in such extractions, as this fraction is degenerate with the value of $\alpha_S$ for the most well-understood observables. To overcome this limitation, we apply recently proposed techniques to statistically demix multiple mixtures of jets and obtain purified quark and gluon distributions based on an operational definition. We illustrate that studying quark and gluon jet substructure separately can significantly improve the sensitivity of such extractions of the strong coupling. We also discuss how using machine learning techniques or infrared- and collinear-unsafe information can improve the demixing performance without the loss of theoretical control. While theoretical research is required to connect the extract topics with the quark and gluon objects in cross section calculations, our study illustrates the potential of demixing to reduce the dominant uncertainty for the $\alpha_S$ extraction from jet substructure at the LHC. |
0705.0900 | S. Weinzierl | Stefan Weinzierl | Feynman integrals and multiple polylogarithms | 23 pages, talk given at the workshop "Renormalization and Galois
theories", Marseille, March 2006; v2: references added | null | null | null | hep-ph | null | In this talk I review the connections between Feynman integrals and multiple
polylogarithms. After an introductory section on loop integrals I discuss the
Mellin-Barnes transformation and shuffle algebras. In a subsequent section
multiple polylogarithms are introduced. Finally, I discuss how certain Feynman
integrals evaluate to multiple polylogarithms.
| [
{
"created": "Mon, 7 May 2007 12:55:26 GMT",
"version": "v1"
},
{
"created": "Thu, 10 May 2007 06:40:56 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Weinzierl",
"Stefan",
""
]
] | In this talk I review the connections between Feynman integrals and multiple polylogarithms. After an introductory section on loop integrals I discuss the Mellin-Barnes transformation and shuffle algebras. In a subsequent section multiple polylogarithms are introduced. Finally, I discuss how certain Feynman integrals evaluate to multiple polylogarithms. |
1102.1334 | Krzysztof Kutak | Krzysztof Kutak | Phenomenology of Jet Production in Forward Direction at High Energy
Hadron Colliders | Talk given at 45th Rencontres de Moriond: QCD and Hadronic
Interactions, La Thuile, Italy, March 13-20, 2010 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate observables relevant for forward jets at LHC. The simulations
are performed using Monte Carlo event generators. In particular we compare
results from CASCADE based on high energy factorization and PYTHIA which is
based on collinear factorization.
| [
{
"created": "Mon, 7 Feb 2011 15:36:30 GMT",
"version": "v1"
}
] | 2011-02-08 | [
[
"Kutak",
"Krzysztof",
""
]
] | We calculate observables relevant for forward jets at LHC. The simulations are performed using Monte Carlo event generators. In particular we compare results from CASCADE based on high energy factorization and PYTHIA which is based on collinear factorization. |
hep-ph/0303159 | David London | Alakabha Datta and David London | Triple-Product Correlations in B -> V1 V2$ Decays and New Physics | 42 pages, LaTeX, no figures. Title changed, several explanatory
paragraphs added, references added, analysis and conclusions unchanged | Int.J.Mod.Phys.A19:2505-2544,2004 | 10.1142/S0217751X04018300 | UdeM-GPP-TH-03-108 | hep-ph | null | In this paper we examine T-violating triple-product correlations (TP's) in B
-> V1 V2 decays. TP's are excellent probes of physics beyond the standard model
(SM) for two reasons: (i) within the SM, most TP's are expected to be tiny, and
(ii) unlike direct CP asymmetries, TP's are not suppressed by the small strong
phases which are expected in B decays. TP's are obtained via the angular
analysis of B -> V1 V2. In a general analysis based on factorization, we
demonstrate that the most promising decays for measuring TP's in the SM involve
excited final-state vector mesons, and we provide estimates of such TP's. We
find that there are only a handful of decays in which large TP's are possible,
and the size of these TP's depends strongly on the size of nonfactorizable
effects. We show that TP's which vanish in the SM can be very large in models
with new physics. The measurement of a nonzero TP asymmetry in a decay where
none is expected would specifically point to new physics involving large
couplings to the right-handed b-quark.
| [
{
"created": "Wed, 19 Mar 2003 00:10:23 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2003 21:26:40 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Dec 2003 19:32:58 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Datta",
"Alakabha",
""
],
[
"London",
"David",
""
]
] | In this paper we examine T-violating triple-product correlations (TP's) in B -> V1 V2 decays. TP's are excellent probes of physics beyond the standard model (SM) for two reasons: (i) within the SM, most TP's are expected to be tiny, and (ii) unlike direct CP asymmetries, TP's are not suppressed by the small strong phases which are expected in B decays. TP's are obtained via the angular analysis of B -> V1 V2. In a general analysis based on factorization, we demonstrate that the most promising decays for measuring TP's in the SM involve excited final-state vector mesons, and we provide estimates of such TP's. We find that there are only a handful of decays in which large TP's are possible, and the size of these TP's depends strongly on the size of nonfactorizable effects. We show that TP's which vanish in the SM can be very large in models with new physics. The measurement of a nonzero TP asymmetry in a decay where none is expected would specifically point to new physics involving large couplings to the right-handed b-quark. |
1106.2322 | Alan Barr | Alan J. Barr, Sky T. French, James A. Frost, Christopher G. Lester | Speedy Higgs boson discovery in decays to tau lepton pairs : h->tau,tau | 4 pages. 3 figures. Additional material in version 2: Figure 2c
(distribution of m_tautau^true), Figure 3 (showing the relative sensitivity
of different projections), related discussion | null | 10.1007/JHEP10(2011)080 | Cavendish-HEP-11/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Discovery of the Higgs boson in any decay channel depends on the existence of
event variables or cuts with sensitivity to the presence of the Higgs. We
demonstrate the non-optimality of the kinematic variables which are currently
expected to play the largest role in the discovery (or exclusion) of the Higgs
at the LHC in the tau channel. Any LHC collaboration looking for opportunities
to gain advantages over its rivals should, perhaps, consider the alternative
strategy we propose.
| [
{
"created": "Sun, 12 Jun 2011 16:09:54 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2011 00:17:48 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Barr",
"Alan J.",
""
],
[
"French",
"Sky T.",
""
],
[
"Frost",
"James A.",
""
],
[
"Lester",
"Christopher G.",
""
]
] | Discovery of the Higgs boson in any decay channel depends on the existence of event variables or cuts with sensitivity to the presence of the Higgs. We demonstrate the non-optimality of the kinematic variables which are currently expected to play the largest role in the discovery (or exclusion) of the Higgs at the LHC in the tau channel. Any LHC collaboration looking for opportunities to gain advantages over its rivals should, perhaps, consider the alternative strategy we propose. |
1710.02284 | Chul Kim | Junegone Chay, Chul Kim | Threshold Factorization Redux | 20 pages, 2 figures; matches published version | Phys. Rev. D 97, 094024 (2018) | 10.1103/PhysRevD.97.094024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reanalyze the factorization theorems for Drell-Yan process and for deep
inelastic scattering near threshold, as constructed in the framework of the
soft-collinear effective theory (SCET), from a new, consistent perspective. In
order to formulate the factorization near threshold in SCET, we should include
an additional degree of freedom with small energy, collinear to the beam
direction. The corresponding collinear-soft mode is included to describe the
parton distribution function (PDF) near threshold. The soft function is
modified by subtracting the contribution of the collinear-soft modes in order
to avoid double counting on the overlap region. As a result, the proper soft
function becomes infrared finite, and all the factorized parts are free of
rapidity divergence. Furthermore, the separation of the relevant scales in each
factorized part becomes manifest. We apply the same idea to the dihadron
production in $e^+ e^-$ annihilation near threshold, and show that the
resultant soft function is also free of infrared and rapidity divergences.
| [
{
"created": "Fri, 6 Oct 2017 06:21:07 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2018 14:22:00 GMT",
"version": "v2"
}
] | 2018-05-30 | [
[
"Chay",
"Junegone",
""
],
[
"Kim",
"Chul",
""
]
] | We reanalyze the factorization theorems for Drell-Yan process and for deep inelastic scattering near threshold, as constructed in the framework of the soft-collinear effective theory (SCET), from a new, consistent perspective. In order to formulate the factorization near threshold in SCET, we should include an additional degree of freedom with small energy, collinear to the beam direction. The corresponding collinear-soft mode is included to describe the parton distribution function (PDF) near threshold. The soft function is modified by subtracting the contribution of the collinear-soft modes in order to avoid double counting on the overlap region. As a result, the proper soft function becomes infrared finite, and all the factorized parts are free of rapidity divergence. Furthermore, the separation of the relevant scales in each factorized part becomes manifest. We apply the same idea to the dihadron production in $e^+ e^-$ annihilation near threshold, and show that the resultant soft function is also free of infrared and rapidity divergences. |
1306.4472 | Viacheslav Kudryavtsev | V.A.Kudryavtsev (Petersburg Nuclear Physics Institute) | Heavy states of hadron string as weak interacting massive particles for
Dark Matter | 4 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Massive states (of order 10 Gev and more) of hadron string (with scale 1 Gev)
can have very small coupling constants with usual baryons of the Universe.
Corresponding mean times for them are found to be order and even more than the
age of the Universe. They are proposed as possible candidates for weak
interacting massive particles (WIMP) of Dark Matter.
| [
{
"created": "Wed, 19 Jun 2013 10:01:04 GMT",
"version": "v1"
}
] | 2013-06-20 | [
[
"Kudryavtsev",
"V. A.",
"",
"Petersburg Nuclear Physics Institute"
]
] | Massive states (of order 10 Gev and more) of hadron string (with scale 1 Gev) can have very small coupling constants with usual baryons of the Universe. Corresponding mean times for them are found to be order and even more than the age of the Universe. They are proposed as possible candidates for weak interacting massive particles (WIMP) of Dark Matter. |
2302.01274 | Ji-Chong Yang Mr | Shuai Zhang and Ji-Chong Yang and Yu-Chen Guo | Using k-means assistant event selection strategy to study anomalous
quartic gauge couplings at muon colliders | 15 pages, 8 figures | Eur. Phys. J. C (2024) 84:142 | 10.1140/epjc/s10052-024-12494-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for new physics beyond the Standard Model is one of the central
problems of current high energy physics interest. As the luminosities of
current and near-future colliders continue to increase, the search for new
physics has increased the requirements for processing large amounts of data.
Meanwhile, quantum computing which is rapidly evolving, has great potential to
become a powerful tool to help search for new physics signals. Since the
k-means algorithm is known to be able to be accelerated with the help of
quantum computing, we investigate and propose an event selection strategy based
on k-means algorithm to search for new physics signals. Taking the case of
tri-photon processes at the muon colliders as an example, the event selection
strategy is shown to be effective in helping to search for the signals of
dimension-8 operators contributing to anomalous quartic gauge couplings.
Compared with traditional event selection strategy, the expected constraints
are generally tighter.
| [
{
"created": "Thu, 2 Feb 2023 18:05:26 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2024 06:35:51 GMT",
"version": "v2"
}
] | 2024-02-28 | [
[
"Zhang",
"Shuai",
""
],
[
"Yang",
"Ji-Chong",
""
],
[
"Guo",
"Yu-Chen",
""
]
] | The search for new physics beyond the Standard Model is one of the central problems of current high energy physics interest. As the luminosities of current and near-future colliders continue to increase, the search for new physics has increased the requirements for processing large amounts of data. Meanwhile, quantum computing which is rapidly evolving, has great potential to become a powerful tool to help search for new physics signals. Since the k-means algorithm is known to be able to be accelerated with the help of quantum computing, we investigate and propose an event selection strategy based on k-means algorithm to search for new physics signals. Taking the case of tri-photon processes at the muon colliders as an example, the event selection strategy is shown to be effective in helping to search for the signals of dimension-8 operators contributing to anomalous quartic gauge couplings. Compared with traditional event selection strategy, the expected constraints are generally tighter. |
1210.5427 | Josip Trampetic Dr. | Josip Trampetic | High energy cosmic rays experiments inspired by noncommutative quantum
field theory | 11 pages, 8 figures, Based on the plenary session talks given at the
conference: 5th Petrov International Symposium: "High Energy Physics,
Cosmology and Gravity", BITP, Kyiv, Ukraine 2012 | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Phenomenological analysis of the covariant theta-exact noncommutative (NC)
gauge field theory (GFT), inspired by high energy cosmic rays experiments, is
performed in the framework of the inelastic neutrino-nucleon scatterings,
plasmon and $Z$-boson decays into neutrino pair, the Big Bang Nucleosynthesis
(BBN) and the Reheating Phase After Inflation (RPAI), respectively. Next we
have have found neutrino two-point function and shows a closed form decoupling
of the hard ultraviolet (UV) divergent term from softened ultraviolet/infrared
(UV/IR) mixing term and from the finite terms as well. For a certain choice of
the noncommutative parameter theta which preserves unitarity, problematic UV
divergent and UV/IR mixing terms vanish. Non-perturbative modifications of the
neutrino dispersion relations are assymptotically independent of the scale of
noncommutativity in both the low and high energy limits and may allow
superluminal propagation.
| [
{
"created": "Fri, 19 Oct 2012 14:20:52 GMT",
"version": "v1"
}
] | 2012-10-22 | [
[
"Trampetic",
"Josip",
""
]
] | Phenomenological analysis of the covariant theta-exact noncommutative (NC) gauge field theory (GFT), inspired by high energy cosmic rays experiments, is performed in the framework of the inelastic neutrino-nucleon scatterings, plasmon and $Z$-boson decays into neutrino pair, the Big Bang Nucleosynthesis (BBN) and the Reheating Phase After Inflation (RPAI), respectively. Next we have have found neutrino two-point function and shows a closed form decoupling of the hard ultraviolet (UV) divergent term from softened ultraviolet/infrared (UV/IR) mixing term and from the finite terms as well. For a certain choice of the noncommutative parameter theta which preserves unitarity, problematic UV divergent and UV/IR mixing terms vanish. Non-perturbative modifications of the neutrino dispersion relations are assymptotically independent of the scale of noncommutativity in both the low and high energy limits and may allow superluminal propagation. |
hep-ph/9811340 | null | Hsiang-nan Li | $k_T$ and threshold resummations | 25 pages in a latex file, 1 figure in a postscript file, revised
version to appear in Chin. J. Phys | null | null | NCKU-HEP-98-11 | hep-ph | null | We demonstrate that both the $k_T$ and threshold resummations can be
performed in the Collins-Soper resummation formalism by evaluating soft gluon
emissions with infrared cutoffs for the longitudinal and transverse loop
momenta, respectively. The reason the $k_T$ resummation for a parton
distribution function leads to suppression in the large $b$ region, $b$ being
the conjugate variable of parton transverse momentum $k_T$, and the threshold
resummation leads to enhancement in the large $N$ limit, $N$ being the moment
of a distribution function, is a consequence of opposite directions of
double-logarithm evolutions. The $k_T$ and threshold resummations for an
energetic final-state jet give suppression. The switch of the threshold
resummation from enhancement to suppression is attributed to a nonvanishing jet
invariant mass. In the same framework we derive a unification of the $k_T$ and
threshold resummations for a parton distribution function by requiring infrared
cutoffs for both longitudinal and transverse loop momenta. This unified
resummation exhibits suppression at large $b$, similar to the $k_T$
resummation, and exhibits enhancement at small $b$, similar to the threshold
resummation.
| [
{
"created": "Mon, 16 Nov 1998 10:09:11 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jul 1999 05:42:57 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Li",
"Hsiang-nan",
""
]
] | We demonstrate that both the $k_T$ and threshold resummations can be performed in the Collins-Soper resummation formalism by evaluating soft gluon emissions with infrared cutoffs for the longitudinal and transverse loop momenta, respectively. The reason the $k_T$ resummation for a parton distribution function leads to suppression in the large $b$ region, $b$ being the conjugate variable of parton transverse momentum $k_T$, and the threshold resummation leads to enhancement in the large $N$ limit, $N$ being the moment of a distribution function, is a consequence of opposite directions of double-logarithm evolutions. The $k_T$ and threshold resummations for an energetic final-state jet give suppression. The switch of the threshold resummation from enhancement to suppression is attributed to a nonvanishing jet invariant mass. In the same framework we derive a unification of the $k_T$ and threshold resummations for a parton distribution function by requiring infrared cutoffs for both longitudinal and transverse loop momenta. This unified resummation exhibits suppression at large $b$, similar to the $k_T$ resummation, and exhibits enhancement at small $b$, similar to the threshold resummation. |
1005.2681 | Basudeb Dasgupta | Basudeb Dasgupta | Physics and Astrophysics Opportunities with Supernova Neutrinos | v2: 9 pages, including 1 Table. Invited review at ICHEP 2010. Update
of previous version which was an invited review at Electroweak Session of
Rencontres de Moriond 2010 | PoS ICHEP2010:294,2010 | null | null | hep-ph astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrinos emitted from a supernova encode useful information about neutrino
physics and astrophysics. Interpreting the neutrino signal depends crucially on
understanding neutrino production, flavor mixing during propagation, and
detection. In this talk, we review the physics potential of a SN neutrino
observation.
| [
{
"created": "Sat, 15 May 2010 15:05:12 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Nov 2010 16:47:59 GMT",
"version": "v2"
}
] | 2011-04-22 | [
[
"Dasgupta",
"Basudeb",
""
]
] | Neutrinos emitted from a supernova encode useful information about neutrino physics and astrophysics. Interpreting the neutrino signal depends crucially on understanding neutrino production, flavor mixing during propagation, and detection. In this talk, we review the physics potential of a SN neutrino observation. |
1802.02657 | Michael Paraskevas Dr | Michael Paraskevas | Dirac and Majorana Feynman Rules with four-fermions | 22 pages, 2 figures. v2: Few minors, prepared for journal submission | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A compact method for amplitude calculations in theories with Dirac and
Majorana effective operators is discussed. Using the renormalizable formalism
of Denner et al., [1,2] for propagators, vertices and fermion (number) flow and
introducing new "reading-rules", it is shown that fermions can be treated as
scalars in the diagrams. The effect of Fermi-statistics appears only in overall
signs and is determined once for whole classes of diagrams. Each vertex in this
method corresponds to two or more vertices in the standard treatment of
effective theories. As such, the advantages of this approach grow together with
the number of four-fermion vertices in a given diagram. The discussion develops
around effective field theories based on the Standard Model, up to
four-fermions and to any order in perturbation theory. Even so, the framework
is more general and can be applied elsewhere.
| [
{
"created": "Wed, 7 Feb 2018 22:08:12 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Mar 2018 14:01:04 GMT",
"version": "v2"
}
] | 2018-03-02 | [
[
"Paraskevas",
"Michael",
""
]
] | A compact method for amplitude calculations in theories with Dirac and Majorana effective operators is discussed. Using the renormalizable formalism of Denner et al., [1,2] for propagators, vertices and fermion (number) flow and introducing new "reading-rules", it is shown that fermions can be treated as scalars in the diagrams. The effect of Fermi-statistics appears only in overall signs and is determined once for whole classes of diagrams. Each vertex in this method corresponds to two or more vertices in the standard treatment of effective theories. As such, the advantages of this approach grow together with the number of four-fermion vertices in a given diagram. The discussion develops around effective field theories based on the Standard Model, up to four-fermions and to any order in perturbation theory. Even so, the framework is more general and can be applied elsewhere. |
1512.08928 | Juan Rojo | J. Katharina Behr, Daniela Bortoletto, James A. Frost, Nathan P.
Hartland, Cigdem Issever and Juan Rojo | Boosting Higgs pair production in the $b\bar{b}b\bar{b}$ final state
with multivariate techniques | 47 pages, 22 figures. v2: updated references, added comparison of
post-MVA kinematic distributions. v3: matches published version in EPJC | null | 10.1140/epjc/s10052-016-4215-5 | OUTP-15-14P | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The measurement of Higgs pair production will be a cornerstone of the LHC
program in the coming years. Double Higgs production provides a crucial window
upon the mechanism of electroweak symmetry breaking and has a unique
sensitivity to the Higgs trilinear coupling. We study the feasibility of a
measurement of Higgs pair production in the $b\bar{b}b\bar{b}$ final state at
the LHC. Our analysis is based on a combination of traditional cut-based
methods with state-of-the-art multivariate techniques. We account for all
relevant backgrounds, including the contributions from light and charm jet
mis-identification, which are ultimately comparable in size to the irreducible
$4b$ QCD background. We demonstrate the robustness of our analysis strategy in
a high pileup environment. For an integrated luminosity of $\mathcal{L}=3$
ab$^{-1}$, a signal significance of $S/\sqrt{B}\simeq 3$ is obtained,
indicating that the $b\bar{b}b\bar{b}$ final state alone could allow for the
observation of double Higgs production at the High-Luminosity LHC.
| [
{
"created": "Wed, 30 Dec 2015 12:51:06 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2016 10:31:35 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Jun 2016 11:05:41 GMT",
"version": "v3"
}
] | 2016-08-03 | [
[
"Behr",
"J. Katharina",
""
],
[
"Bortoletto",
"Daniela",
""
],
[
"Frost",
"James A.",
""
],
[
"Hartland",
"Nathan P.",
""
],
[
"Issever",
"Cigdem",
""
],
[
"Rojo",
"Juan",
""
]
] | The measurement of Higgs pair production will be a cornerstone of the LHC program in the coming years. Double Higgs production provides a crucial window upon the mechanism of electroweak symmetry breaking and has a unique sensitivity to the Higgs trilinear coupling. We study the feasibility of a measurement of Higgs pair production in the $b\bar{b}b\bar{b}$ final state at the LHC. Our analysis is based on a combination of traditional cut-based methods with state-of-the-art multivariate techniques. We account for all relevant backgrounds, including the contributions from light and charm jet mis-identification, which are ultimately comparable in size to the irreducible $4b$ QCD background. We demonstrate the robustness of our analysis strategy in a high pileup environment. For an integrated luminosity of $\mathcal{L}=3$ ab$^{-1}$, a signal significance of $S/\sqrt{B}\simeq 3$ is obtained, indicating that the $b\bar{b}b\bar{b}$ final state alone could allow for the observation of double Higgs production at the High-Luminosity LHC. |
2105.01435 | Valery Lyubovitskij | Stanley J. Brodsky, Valery E. Lyubovitskij, Ivan Schmidt | The Diffractive Contribution to Deep Inelastic Lepton-Proton Scattering:
Implications for QCD Momentum Sum Rules and Parton Distributions | 8 pages, 4 figures | Phys. Lett. B 824, 136801 (2022) | 10.1016/j.physletb.2021.136801 | SLAC-PUB-17599 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cross section for deep inelastic lepton-proton scattering (DIS) $\ell p
\to \ell' X$ includes a diffractive deep inelastic (DDIS) contribution $\ell p
\to \ell' p' X$, in which the proton remains intact with a large longitudinal
momentum fraction $x_F$ greater than 0.9 and small transverse momentum. The
DDIS events, which can be identified with Pomeron exchange in the $t$-channel,
account for approximately $10\%$ of all of the DIS events. Thus, when one
measures DIS, one automatically includes the leading-twist Bjorken-scaling DDIS
events as a contribution to the DIS cross section, whether or not the
final-state proton $p'$ is detected. In such events, the missing momentum
fraction $x_{p'} \sim 0.9$ carried by the final-state proton $p'$ in the DDIS
events could be misidentified with the light-front momentum fraction carried by
sea quarks or gluons in the protons' Fock structure. As we shall show in this
article, the underlying QCD Pomeron-exchange amplitude which produces the DDIS
events does not obey the operator product expansion nor satisfy momentum sum
rules. Thus we conclude that the quark and gluon distributions measured in DIS
experiments will be misidentified, unless the measurements explicitly exclude
the DDIS events and that a correct determination of the parton distribution
functions (PDFs) derived from the DIS data requires the explicit subtraction of
the DDIS contribution from the full DIS cross section.
| [
{
"created": "Tue, 4 May 2021 11:55:33 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Dec 2021 17:17:45 GMT",
"version": "v2"
}
] | 2021-12-06 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | The cross section for deep inelastic lepton-proton scattering (DIS) $\ell p \to \ell' X$ includes a diffractive deep inelastic (DDIS) contribution $\ell p \to \ell' p' X$, in which the proton remains intact with a large longitudinal momentum fraction $x_F$ greater than 0.9 and small transverse momentum. The DDIS events, which can be identified with Pomeron exchange in the $t$-channel, account for approximately $10\%$ of all of the DIS events. Thus, when one measures DIS, one automatically includes the leading-twist Bjorken-scaling DDIS events as a contribution to the DIS cross section, whether or not the final-state proton $p'$ is detected. In such events, the missing momentum fraction $x_{p'} \sim 0.9$ carried by the final-state proton $p'$ in the DDIS events could be misidentified with the light-front momentum fraction carried by sea quarks or gluons in the protons' Fock structure. As we shall show in this article, the underlying QCD Pomeron-exchange amplitude which produces the DDIS events does not obey the operator product expansion nor satisfy momentum sum rules. Thus we conclude that the quark and gluon distributions measured in DIS experiments will be misidentified, unless the measurements explicitly exclude the DDIS events and that a correct determination of the parton distribution functions (PDFs) derived from the DIS data requires the explicit subtraction of the DDIS contribution from the full DIS cross section. |
1011.5037 | Gautam Bhattacharyya | Asmaa Abada, Gautam Bhattacharyya, Debottam Das, C\'edric Weiland | A possible connection between neutrino mass generation and the lightness
of a NMSSM pseudoscalar | 8 pages; v2: version to appear in PLB | Phys.Lett.B700:351-355,2011 | 10.1016/j.physletb.2011.05.020 | LPT Orsay/10-54, SINP/TNP/2010/10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the interesting properties of the NMSSM is that it can accommodate a
light pseudoscalar of order 10 GeV. However, such scenarios are challenged by
several experimental constraints, especially those related to the fermionic
decays of the pseudoscalar. In this Letter, we extend the NMSSM field content
by two gauge singlets, with lepton numbers +1 and -1. This serves the twin
purpose of generating neutrino masses via the inverse see-saw mechanism and
keeping the option of a very light pseudoscalar experimentally viable by
opening dominant invisible decay channels of the pseudoscalar which help it
evade the existing bounds.
| [
{
"created": "Tue, 23 Nov 2010 09:31:49 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2011 10:49:52 GMT",
"version": "v2"
}
] | 2011-07-15 | [
[
"Abada",
"Asmaa",
""
],
[
"Bhattacharyya",
"Gautam",
""
],
[
"Das",
"Debottam",
""
],
[
"Weiland",
"Cédric",
""
]
] | One of the interesting properties of the NMSSM is that it can accommodate a light pseudoscalar of order 10 GeV. However, such scenarios are challenged by several experimental constraints, especially those related to the fermionic decays of the pseudoscalar. In this Letter, we extend the NMSSM field content by two gauge singlets, with lepton numbers +1 and -1. This serves the twin purpose of generating neutrino masses via the inverse see-saw mechanism and keeping the option of a very light pseudoscalar experimentally viable by opening dominant invisible decay channels of the pseudoscalar which help it evade the existing bounds. |
hep-ph/0208226 | Sechul Oh | B. Dutta, C.S. Kim, and Sechul Oh | A Consistent Resolution of Possible Anomalies in B^0 --> phi K_S and B^+
--> eta' K^+ Decays | 14 pages, 2 figures, Revtex, minor changes, to appear in Phys. Rev.
Lett | Phys.Rev.Lett. 90 (2003) 011801 | 10.1103/PhysRevLett.90.011801 | null | hep-ph | null | In the framework of R-parity violating (\rpv) supersymmetry, we try to find a
consistent explanation for both recently measured CP asymmetry in B^0 --> phi
K_S decay and the large branching ratio of B^{+/-} --> eta' K^{+/-} decay,
which are inconsistent with the Standard Model (SM) prediction. We also
investigate other charmless hadronic B --> PP and B --> VP decay modes whose
experimental data favor the SM: for instance, recently measured CP asymmetries
in B^0 --> eta^{prime} K_S and B^0 --> J / Psi K_S. We find that all the
observed data can be accommodated for certain values of \rpv couplings.
| [
{
"created": "Sun, 25 Aug 2002 18:10:19 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Nov 2002 07:19:38 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Dutta",
"B.",
""
],
[
"Kim",
"C. S.",
""
],
[
"Oh",
"Sechul",
""
]
] | In the framework of R-parity violating (\rpv) supersymmetry, we try to find a consistent explanation for both recently measured CP asymmetry in B^0 --> phi K_S decay and the large branching ratio of B^{+/-} --> eta' K^{+/-} decay, which are inconsistent with the Standard Model (SM) prediction. We also investigate other charmless hadronic B --> PP and B --> VP decay modes whose experimental data favor the SM: for instance, recently measured CP asymmetries in B^0 --> eta^{prime} K_S and B^0 --> J / Psi K_S. We find that all the observed data can be accommodated for certain values of \rpv couplings. |
hep-ph/0205329 | Gustavo Burdman | Gustavo Burdman | Constraints on the Bulk Standard Model in the Randall-Sundrum Scenario | 18 pages, 2 ps figures | Phys.Rev. D66 (2002) 076003 | 10.1103/PhysRevD.66.076003 | null | hep-ph hep-ex hep-th | null | We derive constraints on the Randall-Sundrum scenario with the standard model
fields in the bulk. These result from tree level effects associated with the
deformation of the zero mode wave-functions of the W and the Z once electroweak
symmetry is broken. Recently Cs\'{a}ki, Erlich and Terning pointed out that
this implies large contributions to electroweak oblique parameters. Here we
find that when fermions are allowed in the bulk the couplings of the $W$ and
the $Z$ to zero-mode fermions are also affected. We perform a fit to
electroweak observables assuming universal bulk fermion masses and including
all effects and find constraints that are considerably stronger than for the
case with fermions localized in the low energy boundary. These put the lowest
Kaluza-Klein excitation out of reach of the Large Hadron Collider. We then
relax the universality assumption and study the effects of flavor violation in
the bulk and its possible signatures.
| [
{
"created": "Wed, 29 May 2002 19:03:21 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Burdman",
"Gustavo",
""
]
] | We derive constraints on the Randall-Sundrum scenario with the standard model fields in the bulk. These result from tree level effects associated with the deformation of the zero mode wave-functions of the W and the Z once electroweak symmetry is broken. Recently Cs\'{a}ki, Erlich and Terning pointed out that this implies large contributions to electroweak oblique parameters. Here we find that when fermions are allowed in the bulk the couplings of the $W$ and the $Z$ to zero-mode fermions are also affected. We perform a fit to electroweak observables assuming universal bulk fermion masses and including all effects and find constraints that are considerably stronger than for the case with fermions localized in the low energy boundary. These put the lowest Kaluza-Klein excitation out of reach of the Large Hadron Collider. We then relax the universality assumption and study the effects of flavor violation in the bulk and its possible signatures. |
hep-ph/0305104 | Santi Peris | T. Hambye, S. Peris and E. de Rafael | Delta I=1/2 and epsilon'/epsilon in Large-Nc QCD | 25 pages, 8 figures, LaTeX file. Couple of references added | JHEP 0305:027,2003 | 10.1088/1126-6708/2003/05/027 | null | hep-ph hep-lat | null | We present new results for the matrix elements of the Q_6 and Q_4 penguin
operators, evaluated in a large-Nc approach which incorporates important
O(N_c^2\frac{n_f}{N_c}) unfactorized contributions. Our approach shows analytic
matching between short- and long-distance scale dependences within dimensional
renormalization schemes, such as MS-bar. Numerically, we find that there is a
large positive contribution to the Delta I =1/2 matrix element of Q_6 and hence
to the direct CP-violation parameter epsilon'/epsilon. We also present results
for the Delta I = 1/2 rule in K -> pi pi amplitudes, which incorporate the
related and important ``eye-diagram'' contributions of O(N_c^2\frac{1}{N_c})
from the Q_2 operator (i.e. the penguin-like contraction). The results lead to
an enhancement of the Delta I = 1/2 effective coupling. The origin of the large
unfactorized contributions which we find is discussed in terms of the relevant
scales of the problem.
| [
{
"created": "Fri, 9 May 2003 16:34:04 GMT",
"version": "v1"
},
{
"created": "Fri, 30 May 2003 16:20:38 GMT",
"version": "v2"
}
] | 2010-02-03 | [
[
"Hambye",
"T.",
""
],
[
"Peris",
"S.",
""
],
[
"de Rafael",
"E.",
""
]
] | We present new results for the matrix elements of the Q_6 and Q_4 penguin operators, evaluated in a large-Nc approach which incorporates important O(N_c^2\frac{n_f}{N_c}) unfactorized contributions. Our approach shows analytic matching between short- and long-distance scale dependences within dimensional renormalization schemes, such as MS-bar. Numerically, we find that there is a large positive contribution to the Delta I =1/2 matrix element of Q_6 and hence to the direct CP-violation parameter epsilon'/epsilon. We also present results for the Delta I = 1/2 rule in K -> pi pi amplitudes, which incorporate the related and important ``eye-diagram'' contributions of O(N_c^2\frac{1}{N_c}) from the Q_2 operator (i.e. the penguin-like contraction). The results lead to an enhancement of the Delta I = 1/2 effective coupling. The origin of the large unfactorized contributions which we find is discussed in terms of the relevant scales of the problem. |
hep-ph/0109150 | Andre de Gouvea | Andre de Gouvea | Theoretical Aspects of Neutrino Oscillation | Invited Plenary Talk at the NUFACT'01 Conference, 14 pages, 2 figures | Nucl.Instrum.Meth. A503 (2001) 4-12 | 10.1016/S0168-9002(03)00634-X | null | hep-ph | null | I review some aspects concerning the physics of neutrino mixing and
oscillations. I discuss in some detail the physical neutrino oscillations
parameter space in the case of two and three family mixing, and briefly
describe the current knowledge of neutrino mixing parameters according to the
present solar, atmospheric, and reactor neutrino data. I also briefly comment
on the possibility of solving the LNSD anomaly together with the solar and
atmospheric ones. I conclude by emphasising that that even though in five to
ten years time a lot will be learnt from the next round of neutrino
experiments, a great deal about neutrino masses and neutrino mixing will remain
unknown.
| [
{
"created": "Mon, 17 Sep 2001 18:13:43 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"de Gouvea",
"Andre",
""
]
] | I review some aspects concerning the physics of neutrino mixing and oscillations. I discuss in some detail the physical neutrino oscillations parameter space in the case of two and three family mixing, and briefly describe the current knowledge of neutrino mixing parameters according to the present solar, atmospheric, and reactor neutrino data. I also briefly comment on the possibility of solving the LNSD anomaly together with the solar and atmospheric ones. I conclude by emphasising that that even though in five to ten years time a lot will be learnt from the next round of neutrino experiments, a great deal about neutrino masses and neutrino mixing will remain unknown. |
2406.10257 | Vadim Dmitriev | V.V. Dmitriev, S.A. Smolyansky, V.A. Tseryupa | Analysis of the Third Harmonic of a Vacuum Response in a Subcritical
Laser Field | null | Phys. Atom. Nuclei 86 (2023) 913-916 | 10.1134/S1063778823050137 | null | hep-ph hep-th physics.plasm-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We investigate a nonlinear response of the physical vacuum by the example of
the third harmonic in radiation of the electron-positron-photon plasma excited
by a strong time dependent electric field at the focus spot of
counterpropagating laser pulses. The investigation was developed within the
framework of the Bogoliubov-Born-Green-Kirkwood-Yvon kinetic theory
nonperturbatively describing vacuum creation of the quasiparticle
electron-positron plasma (EPP) and different channels of its interaction with
the photon subsystem in the single-photon approximation that are opened in the
presence of a strong semiclassical field. We investigate the radiation of EPP
in the annihilation channel on the basis of the well known approximations and
compare the obtained result with the semiclassical radiation of the plasma
oscillations. In the high-frequency range for large adiabaticity parameter the
quantum radiation dominates in comparison with the semiclassical one.
| [
{
"created": "Mon, 10 Jun 2024 17:07:07 GMT",
"version": "v1"
}
] | 2024-06-18 | [
[
"Dmitriev",
"V. V.",
""
],
[
"Smolyansky",
"S. A.",
""
],
[
"Tseryupa",
"V. A.",
""
]
] | We investigate a nonlinear response of the physical vacuum by the example of the third harmonic in radiation of the electron-positron-photon plasma excited by a strong time dependent electric field at the focus spot of counterpropagating laser pulses. The investigation was developed within the framework of the Bogoliubov-Born-Green-Kirkwood-Yvon kinetic theory nonperturbatively describing vacuum creation of the quasiparticle electron-positron plasma (EPP) and different channels of its interaction with the photon subsystem in the single-photon approximation that are opened in the presence of a strong semiclassical field. We investigate the radiation of EPP in the annihilation channel on the basis of the well known approximations and compare the obtained result with the semiclassical radiation of the plasma oscillations. In the high-frequency range for large adiabaticity parameter the quantum radiation dominates in comparison with the semiclassical one. |
2111.07586 | Manfred Lindner | M. Sajjad Athar, Steven W. Barwick, Thomas Brunner, Jun Cao, Mikhail
Danilov, Kunio Inoue, Takaaki Kajita, Marek Kowalski, Manfred Lindner,
Kenneth R. Long, Nathalie Palanque-Delabrouille, Werner Rodejohann, Heidi
Schellman, Kate Scholberg, Seon-Hee Seo, Nigel J.T. Smith, Walter Winter,
Geralyn P. Zeller, Renata Zukanovich Funchal | Status and Perspectives of Neutrino Physics | 227 pages; this review of the field of neutrino physics emerged from
a report written by a panel on the request of IUPAP (International Union of
Pure and Applied Physics). The mandate, the panel members and the report can
be found on the web page of the panel at ht tps://www.iupapneutrinopanel.org | null | 10.1016/j.ppnp.2022.103947 | null | hep-ph astro-ph.IM hep-ex nucl-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | This review demonstrates the unique role of the neutrino by discussing in
detail the physics of and with neutrinos. We deal with neutrino sources,
neutrino oscillations, absolute masses, interactions, the possible existence of
sterile neutrinos, and theoretical implications. In addition, synergies of
neutrino physics with other research fields are found, and requirements to
continue successful neutrino physics in the future, in terms of technological
developments and adequate infrastructures, are stressed.
| [
{
"created": "Mon, 15 Nov 2021 08:07:21 GMT",
"version": "v1"
}
] | 2022-03-23 | [
[
"Athar",
"M. Sajjad",
""
],
[
"Barwick",
"Steven W.",
""
],
[
"Brunner",
"Thomas",
""
],
[
"Cao",
"Jun",
""
],
[
"Danilov",
"Mikhail",
""
],
[
"Inoue",
"Kunio",
""
],
[
"Kajita",
"Takaaki",
""
],
[
"Kowalski",
"Marek",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Long",
"Kenneth R.",
""
],
[
"Palanque-Delabrouille",
"Nathalie",
""
],
[
"Rodejohann",
"Werner",
""
],
[
"Schellman",
"Heidi",
""
],
[
"Scholberg",
"Kate",
""
],
[
"Seo",
"Seon-Hee",
""
],
[
"Smith",
"Nigel J. T.",
""
],
[
"Winter",
"Walter",
""
],
[
"Zeller",
"Geralyn P.",
""
],
[
"Funchal",
"Renata Zukanovich",
""
]
] | This review demonstrates the unique role of the neutrino by discussing in detail the physics of and with neutrinos. We deal with neutrino sources, neutrino oscillations, absolute masses, interactions, the possible existence of sterile neutrinos, and theoretical implications. In addition, synergies of neutrino physics with other research fields are found, and requirements to continue successful neutrino physics in the future, in terms of technological developments and adequate infrastructures, are stressed. |
1810.12261 | Johannes Bl\"umlein | J. Ablinger, J. Bl\"umlein, P. Marquard, N. Rana, and C. Schneider | Automated Solution of First Order Factorizable Systems of Differential
Equations in One Variable | 39 pages Latex, 19 figures, 2 style files, and anc-files | null | 10.1016/j.nuclphysb.2018.12.010 | DESY 18--053, DO--TH 18/09, TIF-UNIMI-2018-8 | hep-ph hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an algorithm which allows to solve analytically linear systems of
differential equations which factorize to first order. The solution is given in
terms of iterated integrals over an alphabet where its structure is implied by
the coefficient matrix of the differential equations. These systems appear in a
large variety of higher order calculations in perturbative Quantum Field
Theories. We apply this method to calculate the master integrals of the
three--loop massive form factors for different currents, as an illustration,
and present the results for the vector form factors in detail. Here the
solution space emerging is given by the cyclotomic harmonic polylogarithms and
their associated special constants. No special basis representation of the
master integrals is needed. The algorithm can be applied as well to more
general cases factorizing at first order, which are based on more general
alphabets, iterated integrals and associated constants.
| [
{
"created": "Mon, 29 Oct 2018 17:19:43 GMT",
"version": "v1"
}
] | 2018-12-19 | [
[
"Ablinger",
"J.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Marquard",
"P.",
""
],
[
"Rana",
"N.",
""
],
[
"Schneider",
"C.",
""
]
] | We present an algorithm which allows to solve analytically linear systems of differential equations which factorize to first order. The solution is given in terms of iterated integrals over an alphabet where its structure is implied by the coefficient matrix of the differential equations. These systems appear in a large variety of higher order calculations in perturbative Quantum Field Theories. We apply this method to calculate the master integrals of the three--loop massive form factors for different currents, as an illustration, and present the results for the vector form factors in detail. Here the solution space emerging is given by the cyclotomic harmonic polylogarithms and their associated special constants. No special basis representation of the master integrals is needed. The algorithm can be applied as well to more general cases factorizing at first order, which are based on more general alphabets, iterated integrals and associated constants. |
hep-ph/9707445 | null | P.S.Gill and Manmohan Gupta (CAS in Physics, Panjab University,
Chandigarh (India)) | Fritzsch-Xing mass matrices, $V_{td}$ and CP Violating phase $\delta$ | 8 LaTeX pages with 1 figure (to be published in PRD as brief Report) | Phys.Rev. D56 (1997) 3143-3146 | 10.1103/PhysRevD.56.3143 | PU-HEP/96/gl04 (P U Chd India) | hep-ph | null | Natural 4 zeros texture mass matrices recently proposed by Fritzsch and Xing
have been investigated by including `non-leading'corrections in the context of
latest data regarding m_t^{pole} and V_{CKM} matrix elements. Apart from
accommodating m_t^{pole} in the range 175\pm15 GeV, |V_{cb}| and
|V_{ub}/V_{cb}|=0.08\pm0.02, the analysis with maximal CP-violation predicts
|V_{td}| = .005-.013. Further, the CP-violating phase angle \delta can be
restricted to the ranges (i) 22^o -45^o and (ii) 95^o - 130^o, concretizing the
ambiguity regarding phase of CKM matrix. Furthermore, we find that non-leading
calculations are important when `Cabibbo triangle' is to be linked to unitarity
triangle.
| [
{
"created": "Wed, 23 Jul 1997 12:46:10 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Gill",
"P. S.",
"",
"CAS in Physics, Panjab University,\n Chandigarh"
],
[
"Gupta",
"Manmohan",
"",
"CAS in Physics, Panjab University,\n Chandigarh"
]
] | Natural 4 zeros texture mass matrices recently proposed by Fritzsch and Xing have been investigated by including `non-leading'corrections in the context of latest data regarding m_t^{pole} and V_{CKM} matrix elements. Apart from accommodating m_t^{pole} in the range 175\pm15 GeV, |V_{cb}| and |V_{ub}/V_{cb}|=0.08\pm0.02, the analysis with maximal CP-violation predicts |V_{td}| = .005-.013. Further, the CP-violating phase angle \delta can be restricted to the ranges (i) 22^o -45^o and (ii) 95^o - 130^o, concretizing the ambiguity regarding phase of CKM matrix. Furthermore, we find that non-leading calculations are important when `Cabibbo triangle' is to be linked to unitarity triangle. |
2105.14054 | Miguel Nebot | Jo\~ao M. Alves (Lisbon, CFTP), Francisco J. Botella (Valencia U.,
IFIC), Gustavo C. Branco (Lisbon, CFTP), Fernando Cornet-Gomez, Miguel Nebot
(Valencia U., IFIC) | The framework for a common origin of $\delta_{\rm CKM}$ and $\delta_{\rm
PMNS}$ | 20 pages | null | 10.1140/epjc/s10052-021-09512-y | CFTP/21-08 IFIC/21-17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse a possible connection between CP violations in the quark and
lepton sectors, parametrised by the CKM and PMNS phases. If one assumes that CP
breaking arises from complex Yukawa couplings, both in the quark and lepton
sectors, the above connection is not possible in general, since Yukawa
couplings in the two sectors have independent flavour structures. We show that
both the CKM and PMNS phases can instead be generated by a vacuum phase in a
class of two Higgs doublet models, and in this case a connection may be
established. This scenario requires the presence of scalar FCNC at tree level,
both in the quark and lepton sectors. The appearance of these FCNC is an
obstacle and a blessing. An obstacle since one has to analyse which models are
able to conform to the strict experimental limits on FCNC, both in the quark
and lepton sectors. A blessing, because this class of models is falsifiable
since FCNC arise at a level which can be probed experimentally in the near
future, specially in the processes $h\to e^\pm\tau^\mp$ and $t\to h c$. The
connection between CP violations in CKM and PMNS is explicitely illustrated in
models with Minimal Flavour Violation.
| [
{
"created": "Fri, 28 May 2021 18:42:18 GMT",
"version": "v1"
}
] | 2021-09-01 | [
[
"Alves",
"João M.",
"",
"Lisbon, CFTP"
],
[
"Botella",
"Francisco J.",
"",
"Valencia U.,\n IFIC"
],
[
"Branco",
"Gustavo C.",
"",
"Lisbon, CFTP"
],
[
"Cornet-Gomez",
"Fernando",
"",
"Valencia U., IFIC"
],
[
"Nebot",
"Miguel",
"",
"Valencia U., IFIC"
]
] | We analyse a possible connection between CP violations in the quark and lepton sectors, parametrised by the CKM and PMNS phases. If one assumes that CP breaking arises from complex Yukawa couplings, both in the quark and lepton sectors, the above connection is not possible in general, since Yukawa couplings in the two sectors have independent flavour structures. We show that both the CKM and PMNS phases can instead be generated by a vacuum phase in a class of two Higgs doublet models, and in this case a connection may be established. This scenario requires the presence of scalar FCNC at tree level, both in the quark and lepton sectors. The appearance of these FCNC is an obstacle and a blessing. An obstacle since one has to analyse which models are able to conform to the strict experimental limits on FCNC, both in the quark and lepton sectors. A blessing, because this class of models is falsifiable since FCNC arise at a level which can be probed experimentally in the near future, specially in the processes $h\to e^\pm\tau^\mp$ and $t\to h c$. The connection between CP violations in CKM and PMNS is explicitely illustrated in models with Minimal Flavour Violation. |
0807.0801 | Gilberto Colangelo | Gilberto Colangelo, Emanuel Nikolidakis and Christopher Smith | Supersymmetric models with minimal flavour violation and their running | plain latex, 38 pages and 5 figures Eq. (12) corrected and one
reference added, conclusions unchanged. Published version | Eur.Phys.J.C59:75-98,2009 | 10.1140/epjc/s10052-008-0796-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the formulation of the principle of minimal flavor violation (MFV)
in the minimal supersymmetric extension of the standard model, both at moderate
and large tan(beta), and with or without new CP-violating phases. We introduce
a counting rule which keeps track of the highly hierarchical structure of the
Yukawa matrices. In this manner, we are able to control systematically which
terms can be discarded in the soft SUSY breaking part of the Lagrangian. We
argue that for the implementation of this counting rule, it is convenient to
introduce a new basis of matrices in which both the squark (and slepton) mass
terms as well as the trilinear couplings can be expanded. We derive the RGE for
the MFV parameters and show that the beta functions also respect the counting
rule. For moderate tan(beta), we provide explicit analytic solutions of these
RGE and illustrate their behaviour by analyzing the neighbourhood (also
switching on new phases) of the SPS-1a benchmark point. We then show that even
in the case of large tan(beta), the RGE remain valid and that the analytic
solutions obtained for moderate tan(beta) still allow us to understand the most
important features of the running of the parameters, as illustrated with the
help of the SPS-4 benchmark point.
| [
{
"created": "Mon, 7 Jul 2008 15:28:52 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jan 2009 15:06:39 GMT",
"version": "v2"
}
] | 2009-01-21 | [
[
"Colangelo",
"Gilberto",
""
],
[
"Nikolidakis",
"Emanuel",
""
],
[
"Smith",
"Christopher",
""
]
] | We revisit the formulation of the principle of minimal flavor violation (MFV) in the minimal supersymmetric extension of the standard model, both at moderate and large tan(beta), and with or without new CP-violating phases. We introduce a counting rule which keeps track of the highly hierarchical structure of the Yukawa matrices. In this manner, we are able to control systematically which terms can be discarded in the soft SUSY breaking part of the Lagrangian. We argue that for the implementation of this counting rule, it is convenient to introduce a new basis of matrices in which both the squark (and slepton) mass terms as well as the trilinear couplings can be expanded. We derive the RGE for the MFV parameters and show that the beta functions also respect the counting rule. For moderate tan(beta), we provide explicit analytic solutions of these RGE and illustrate their behaviour by analyzing the neighbourhood (also switching on new phases) of the SPS-1a benchmark point. We then show that even in the case of large tan(beta), the RGE remain valid and that the analytic solutions obtained for moderate tan(beta) still allow us to understand the most important features of the running of the parameters, as illustrated with the help of the SPS-4 benchmark point. |
hep-ph/9410260 | Markus Finkemeier | R. Decker, M. Finkemeier, P. Heiliger and H.H. Jonsson | Tau Decays into Four Pions | 12 pages, 12 figures (appended). Revised version: Minor changes in
presentation and references. Fortran code included with tex source. | Z.Phys. C70 (1996) 247-254 | null | TTP 94-13, LNF-94/066(IR) | hep-ph | null | We compute branching ratios and invariant mass distributions of the tau
decays into four pions. The hadronic matrix elements are obtained by starting
from the structure of the hadronic current in chiral limit and then
implementing low-lying resonances in the different channels. Reasonable
agreement with experiment is obtained both for the $\tau \to \nu_{\tau} + (4
\pi ) $ decay rates and the $e^+e^- \to (4 \pi ) $ cross sections. Furthermore
we supply an interface to use our matrix elements within the Tauola Monte-Carlo
program.
| [
{
"created": "Tue, 11 Oct 1994 13:53:42 GMT",
"version": "v1"
},
{
"created": "Thu, 11 May 1995 15:02:34 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Decker",
"R.",
""
],
[
"Finkemeier",
"M.",
""
],
[
"Heiliger",
"P.",
""
],
[
"Jonsson",
"H. H.",
""
]
] | We compute branching ratios and invariant mass distributions of the tau decays into four pions. The hadronic matrix elements are obtained by starting from the structure of the hadronic current in chiral limit and then implementing low-lying resonances in the different channels. Reasonable agreement with experiment is obtained both for the $\tau \to \nu_{\tau} + (4 \pi ) $ decay rates and the $e^+e^- \to (4 \pi ) $ cross sections. Furthermore we supply an interface to use our matrix elements within the Tauola Monte-Carlo program. |
1810.12915 | Andreas Papaefstathiou | Duff Neill, Andreas Papaefstathiou, Wouter J. Waalewijn, Lorenzo Zoppi | Phenomenology with a recoil-free jet axis: TMD fragmentation and the jet
shape | 26 pages, 16 figures, version 2: matches Journal version | null | 10.1007/JHEP01(2019)067 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenology of recoil-free jet axes using analytic
calculations and Monte Carlo simulations. Our focus is on the average energy as
function of the angle with the jet axis (the jet shape), and the energy and
transverse momenta of hadrons in a jet (TMD fragmentation). We find that the
dependence on the angle (or transverse momentum) is governed by a power law, in
contrast to the double-logarithmic dependence for the standard jet axis. The
effects of the jet radius, jet algorithm, angular resolution and grooming are
investigated. TMD fragmentation is important for constraining the structure of
the proton through semi-inclusive deep-inelastic scattering. These observables
are also of interest to the LHC, for example to constrain $\alpha_s$ from
precision jet measurements, or probe the quark-gluon plasma in heavy-ion
collisions.
| [
{
"created": "Tue, 30 Oct 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2019 13:55:19 GMT",
"version": "v2"
}
] | 2019-01-30 | [
[
"Neill",
"Duff",
""
],
[
"Papaefstathiou",
"Andreas",
""
],
[
"Waalewijn",
"Wouter J.",
""
],
[
"Zoppi",
"Lorenzo",
""
]
] | We study the phenomenology of recoil-free jet axes using analytic calculations and Monte Carlo simulations. Our focus is on the average energy as function of the angle with the jet axis (the jet shape), and the energy and transverse momenta of hadrons in a jet (TMD fragmentation). We find that the dependence on the angle (or transverse momentum) is governed by a power law, in contrast to the double-logarithmic dependence for the standard jet axis. The effects of the jet radius, jet algorithm, angular resolution and grooming are investigated. TMD fragmentation is important for constraining the structure of the proton through semi-inclusive deep-inelastic scattering. These observables are also of interest to the LHC, for example to constrain $\alpha_s$ from precision jet measurements, or probe the quark-gluon plasma in heavy-ion collisions. |
0710.1401 | Vali Bashiry | V. Bashiry, K. Zeynali | Analysis of the B --> \pi \ell^+ \ell^- Decay in the Standard Model with
Fourth Generation | 17 pages, 8 figures | null | 10.1088/1126-6708/2007/12/055 | null | hep-ph | null | We investigate the influence of the fourth generation quarks on the branching
ratio and the CP-asymmetry in B -->\pi \ell^+ \ell^- decay. Taking the
|V_{t'd}V_{t'b}| ~ 0.001 with phase about 10 degree, which is consistent with
the sin2\phi_1 of the CKM and the B_d mixing parameter \Delta m_{B_d}, we
obtain that for both muon and tau channels the branching ratio, the magnitude
of CP-asymmetry and lepton polarization depict strong dependency on the 4th
generation quarks mass and mixing parameters. These results can serve as a good
tool to search for new physics effects, precisely, to search for the fourth
generation quarks($t', b')$ via its indirect manifestations in loop diagrams.
| [
{
"created": "Sun, 7 Oct 2007 07:27:18 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Oct 2007 11:34:38 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Bashiry",
"V.",
""
],
[
"Zeynali",
"K.",
""
]
] | We investigate the influence of the fourth generation quarks on the branching ratio and the CP-asymmetry in B -->\pi \ell^+ \ell^- decay. Taking the |V_{t'd}V_{t'b}| ~ 0.001 with phase about 10 degree, which is consistent with the sin2\phi_1 of the CKM and the B_d mixing parameter \Delta m_{B_d}, we obtain that for both muon and tau channels the branching ratio, the magnitude of CP-asymmetry and lepton polarization depict strong dependency on the 4th generation quarks mass and mixing parameters. These results can serve as a good tool to search for new physics effects, precisely, to search for the fourth generation quarks($t', b')$ via its indirect manifestations in loop diagrams. |
hep-ph/0510332 | Claudio Coriano | Claudio Coriano', Nikos Irges and Elias Kiritsis | On the Effective Theory of Low Scale Orientifold String Vacua | 73 pages, 2 figs (v2) Macro problems fixed, typo corrected | Nucl.Phys. B746 (2006) 77-135 | 10.1016/j.nuclphysb.2006.04.009 | CPHT-RR 063.1005, LTH 678 | hep-ph hep-th | null | The effective field theory of the minimal Low Scale Orientifold Models is
developed. It describes universal features of related orientifold vacua in
string theory. It contains, beyond the Standard Model fields, an MSSM-like
Higgs sector and three anomalous (massive) U(1) gauge bosons. All
renormalizable couplings are included as well as some dimension-five couplings
that are important for anomaly cancellation. The Higgs symmetry breaking
induces mixing between the anomalous U(1) gauge bosons and the photon and
$Z^0$. This mixing as well as the anomaly generated cubic vector boson
couplings is potentially important for discriminating such models from other
theories containing Z's. Some interesting tree-level processes are also
evaluated.
| [
{
"created": "Tue, 25 Oct 2005 17:41:30 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Nov 2005 20:37:34 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Coriano'",
"Claudio",
""
],
[
"Irges",
"Nikos",
""
],
[
"Kiritsis",
"Elias",
""
]
] | The effective field theory of the minimal Low Scale Orientifold Models is developed. It describes universal features of related orientifold vacua in string theory. It contains, beyond the Standard Model fields, an MSSM-like Higgs sector and three anomalous (massive) U(1) gauge bosons. All renormalizable couplings are included as well as some dimension-five couplings that are important for anomaly cancellation. The Higgs symmetry breaking induces mixing between the anomalous U(1) gauge bosons and the photon and $Z^0$. This mixing as well as the anomaly generated cubic vector boson couplings is potentially important for discriminating such models from other theories containing Z's. Some interesting tree-level processes are also evaluated. |
1106.0998 | Andrzej Buras | Andrzej J. Buras | Flavour Visions | 18 pages, 1 Figure, Talk given at the 13th International Conference
on B-Physics at Hadron Machines, April 4-8 2011 Amsterdam, the Netherlands | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This decade will allow to improve the resolution of the short distance scales
by at least an order of magnitude, extending the picture of fundamental physics
down to scales $5\cdot 10^{-20}$m with the help of the LHC. Further resolution
down to scales as short as $10^{-21}$m should be possible with the help of high
precision experiments in which flavour violating processes will play a
prominent role. Will this increase in resolution allow us to see new particles
(new animalcula) similarly to what Antoni van Leeuvenhoek saw by discovering
bacteria in 1676? The basic question for particle physics is how these new
animalcula will look like and which difficulties of the Standard Model (SM)
they will help us to solve and which new puzzles and problems they will bring
with them. I will describe what role flavour physics will play in these
exciting times provided this new world is animalculated.
| [
{
"created": "Mon, 6 Jun 2011 09:34:56 GMT",
"version": "v1"
}
] | 2011-06-07 | [
[
"Buras",
"Andrzej J.",
""
]
] | This decade will allow to improve the resolution of the short distance scales by at least an order of magnitude, extending the picture of fundamental physics down to scales $5\cdot 10^{-20}$m with the help of the LHC. Further resolution down to scales as short as $10^{-21}$m should be possible with the help of high precision experiments in which flavour violating processes will play a prominent role. Will this increase in resolution allow us to see new particles (new animalcula) similarly to what Antoni van Leeuvenhoek saw by discovering bacteria in 1676? The basic question for particle physics is how these new animalcula will look like and which difficulties of the Standard Model (SM) they will help us to solve and which new puzzles and problems they will bring with them. I will describe what role flavour physics will play in these exciting times provided this new world is animalculated. |
hep-ph/0108152 | Taizan Watari | T.Watari and T.Yanagida | Supersymmetric Grand Unification Model with the Orbifold Symmetry
Breaking in the Six Dimensional Supergravity | 9 pages, including 2 figures, UT-962 | Phys.Lett. B519 (2001) 164-168 | 10.1016/S0370-2693(01)01124-8 | null | hep-ph | null | We construct supersymmetric (SUSY) grand unification (GUT) models in the six
dimensional space-time where the GUT symmetry is broken down to the
standard-model gauge group by a simple orbifolding T^2/Z_4 or T^2/Z_6 and a
pair of massless Higgs doublets in the SUSY standard model are naturally
obtained. Since the background geometry here is simple compared with models
using the Scherk-Schwarz mechanism, one might hope for an approximate gauge
coupling unification in the present models. Here, the presence of the massless
Higgs multiplets in the bulk is quite natural, since the anomaly cancellation
in the six dimensional space-time requires N=2 hyper multiplets in the bulk,
some of which are origins of the Higgs doublets. However, the origin of the
quarks and leptons is still not clear at all.
| [
{
"created": "Sun, 19 Aug 2001 13:54:07 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Watari",
"T.",
""
],
[
"Yanagida",
"T.",
""
]
] | We construct supersymmetric (SUSY) grand unification (GUT) models in the six dimensional space-time where the GUT symmetry is broken down to the standard-model gauge group by a simple orbifolding T^2/Z_4 or T^2/Z_6 and a pair of massless Higgs doublets in the SUSY standard model are naturally obtained. Since the background geometry here is simple compared with models using the Scherk-Schwarz mechanism, one might hope for an approximate gauge coupling unification in the present models. Here, the presence of the massless Higgs multiplets in the bulk is quite natural, since the anomaly cancellation in the six dimensional space-time requires N=2 hyper multiplets in the bulk, some of which are origins of the Higgs doublets. However, the origin of the quarks and leptons is still not clear at all. |
hep-ph/9605440 | D. R. T. Jones | P.M. Ferreira, I. Jack and D.R.T. Jones | The three-loop SSM $\beta$-functions | 10 pages. Plain Tex. Uses Harvmac and epsf. Three figures. Final
journal version, with more accurate boundary conditions, affecting two of the
figures | Phys.Lett. B387 (1996) 80-86 | 10.1016/0370-2693(96)01005-2 | LTH 372 | hep-ph | null | We present the supersymmetric standard model three-loop $\beta$-functions for
gauge and Yukawa couplings and consider the effect of three-loop corrections on
the standard running coupling analyses.
| [
{
"created": "Thu, 30 May 1996 14:11:50 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jun 1996 16:25:00 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Oct 1996 14:35:04 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Ferreira",
"P. M.",
""
],
[
"Jack",
"I.",
""
],
[
"Jones",
"D. R. T.",
""
]
] | We present the supersymmetric standard model three-loop $\beta$-functions for gauge and Yukawa couplings and consider the effect of three-loop corrections on the standard running coupling analyses. |
hep-ph/0210380 | Stefan Dittmaier | Stefan Dittmaier | Associated Higgs production with heavy quark pairs at hadron colliders | 9 pages, latex, 4 ps files, to appear in the proceedings of "The 10th
International Conference on Supersymmetry and Unification of Fundamental
Interactions, SUSY02" | null | null | MPI-PhT/2002-62 | hep-ph | null | The reactions p\bar{p}/pp -> t\bar{t}H+X represent important channels in the
search for the Standard Model Higgs boson at the Tevatron and the LHC. In the
leading perturbative order the cross sections suffer from severe
(renormalization and factorization) scale uncertainties. The next-to-leading
order QCD corrections stabilize the cross sections considerably. The
calculation of these corrections is briefly reviewed, and a few numerical
results are discussed.
| [
{
"created": "Mon, 28 Oct 2002 14:44:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dittmaier",
"Stefan",
""
]
] | The reactions p\bar{p}/pp -> t\bar{t}H+X represent important channels in the search for the Standard Model Higgs boson at the Tevatron and the LHC. In the leading perturbative order the cross sections suffer from severe (renormalization and factorization) scale uncertainties. The next-to-leading order QCD corrections stabilize the cross sections considerably. The calculation of these corrections is briefly reviewed, and a few numerical results are discussed. |
0804.2503 | Haibo Yu | Mu-Chun Chen and Hai-Bo Yu | Minimal Flavor Violation in the Lepton Sector of the Randall-Sundrum
Model | 12 pages, no figure; v2: clarifying remarks and references added; v3:
version to appear in Phys. Lett. B | Phys.Lett.B672:253-256,2009 | 10.1016/j.physletb.2009.01.030 | UCI-TR-2008-16, NSF-KITP-08-57 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a realization of Minimal Flavor Violation in the lepton sector of
the Randall-Sundrum model. With the MFV assumption, the only source of flavor
violation are the 5D Yukawa couplings, and the usual two independent sources of
flavor violation are related. In the limit of massless neutrinos, the bulk mass
matrices and 5D Yukawa matrices are simultaneously diagonalized, and hence the
absence of FCNCs. In the case of massive neutrinos, the contributions to FCNCs
in the charged lepton sector are highly suppressed, due to the smallness of
neutrino masses. In addition, the MFV assumption also allows suppressing
one-loop charged current contributions to flavor changing processes by reducing
the size of the Yukawa couplings, which is not possible in the generic
anarchical case. We found that the first KK mass scale as low as ~ 3 TeV can be
allowed. In both cases, we present a set of numerical results that give rise to
realistic lepton masses and mixing angles. Mild hierarchy in the 5D Yukawa
matrix of O(25) in our numerical example is required to be consistent with two
large and one small mixing angles. This tuning could be improved by having a
more thorough search of the parameter space.
| [
{
"created": "Wed, 16 Apr 2008 17:59:30 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 2008 20:35:40 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jan 2009 08:26:04 GMT",
"version": "v3"
}
] | 2009-02-18 | [
[
"Chen",
"Mu-Chun",
""
],
[
"Yu",
"Hai-Bo",
""
]
] | We propose a realization of Minimal Flavor Violation in the lepton sector of the Randall-Sundrum model. With the MFV assumption, the only source of flavor violation are the 5D Yukawa couplings, and the usual two independent sources of flavor violation are related. In the limit of massless neutrinos, the bulk mass matrices and 5D Yukawa matrices are simultaneously diagonalized, and hence the absence of FCNCs. In the case of massive neutrinos, the contributions to FCNCs in the charged lepton sector are highly suppressed, due to the smallness of neutrino masses. In addition, the MFV assumption also allows suppressing one-loop charged current contributions to flavor changing processes by reducing the size of the Yukawa couplings, which is not possible in the generic anarchical case. We found that the first KK mass scale as low as ~ 3 TeV can be allowed. In both cases, we present a set of numerical results that give rise to realistic lepton masses and mixing angles. Mild hierarchy in the 5D Yukawa matrix of O(25) in our numerical example is required to be consistent with two large and one small mixing angles. This tuning could be improved by having a more thorough search of the parameter space. |
hep-ph/9511382 | Goloskokov Sergei Vitalievich | S.V.Goloskokov | Structure of Pomeron Couplings and Single-Spin Asymmetry in Diffractive
$Q \bar Q$ Production | 7 pages, latex, 5 figures in compressed uufile | Phys.Rev.D53:5995-5999,1996 | 10.1103/PhysRevD.53.5995 | IFUP-TH 66/95 | hep-ph | null | Transverse single spin asymmetry in polarized diffractive $Q \bar Q$
production is calculated. It is shown that this asymmetry depends strongly on
the spin structure of the pomeron coupling, which permits one to study the
pomeron couplings properties in future polarized experiments.
| [
{
"created": "Tue, 21 Nov 1995 13:35:02 GMT",
"version": "v1"
}
] | 2010-01-06 | [
[
"Goloskokov",
"S. V.",
""
]
] | Transverse single spin asymmetry in polarized diffractive $Q \bar Q$ production is calculated. It is shown that this asymmetry depends strongly on the spin structure of the pomeron coupling, which permits one to study the pomeron couplings properties in future polarized experiments. |
hep-ph/9402337 | G. Ecker | G. Ecker | Chiral invariant renormalization of the pion--nucleon interaction | 13 pages, LaTex, 2 figures in appended postscript file, Univ. Wien
preprint UWThPh-1994-1 | Phys.Lett. B336 (1994) 508-517 | 10.1016/0370-2693(94)90565-7 | null | hep-ph nucl-th | null | The leading divergences of the generating functional for Green functions of
quark currents between one--nucleon states are calculated with heat kernel
techniques. The results allow for a chiral invariant renormalization of all
two--nucleon Green functions of the pion--nucleon system to $O(p^3)$ in the
low--energy expansion.
| [
{
"created": "Tue, 22 Feb 1994 13:04:15 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ecker",
"G.",
""
]
] | The leading divergences of the generating functional for Green functions of quark currents between one--nucleon states are calculated with heat kernel techniques. The results allow for a chiral invariant renormalization of all two--nucleon Green functions of the pion--nucleon system to $O(p^3)$ in the low--energy expansion. |
hep-ph/9309238 | Daniel Boyanovsky | D. Boyanovsky, H. J. de Vega and R. Holman | Dynamics of Cosmological Phase Transitions | 26 pages;Latex;4 figures not included, available upon request;
PITT-93-9 | null | null | null | hep-ph | null | The dynamics of typical phase transitions is studied out of equilibrium in
weakly coupled inflaton-type scalar field theories in Minkowski space. The
shortcomings of the effective potential and equilibrium descriptions are
pointed out. A case of a rapid supercooling from $T_i>T_c$ to $T_f \ll T_c$ is
considered.
The equations of motion up to one-loop for the order parameter are obtained
and integrated for the case of ``slow rollover initial conditions''. It is
shown that the instabilities responsible for the process of phase separation
introduce dramatic corrections to the evolution. Domain formation and growth
(spinodal decomposition) is studied in a non-perturbative self-consistent
approximation.
For very weakly coupled theories domains grow for a long time, their final
size is several times the zero temperature correlation length. For strongly
coupled theories the final size of the domains is comparable to the zero
temperature correlation length and the transition proceeds faster. We also
obtain the evolution equations for the order parameter and the fluctuations to
one-loop order and in a non-perturbative Hartree approximation in spatially
flat FRW cosmologies. The renormalization, and leading behavior of the high
temperature limit are analyzed.
| [
{
"created": "Tue, 7 Sep 1993 20:20:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Boyanovsky",
"D.",
""
],
[
"de Vega",
"H. J.",
""
],
[
"Holman",
"R.",
""
]
] | The dynamics of typical phase transitions is studied out of equilibrium in weakly coupled inflaton-type scalar field theories in Minkowski space. The shortcomings of the effective potential and equilibrium descriptions are pointed out. A case of a rapid supercooling from $T_i>T_c$ to $T_f \ll T_c$ is considered. The equations of motion up to one-loop for the order parameter are obtained and integrated for the case of ``slow rollover initial conditions''. It is shown that the instabilities responsible for the process of phase separation introduce dramatic corrections to the evolution. Domain formation and growth (spinodal decomposition) is studied in a non-perturbative self-consistent approximation. For very weakly coupled theories domains grow for a long time, their final size is several times the zero temperature correlation length. For strongly coupled theories the final size of the domains is comparable to the zero temperature correlation length and the transition proceeds faster. We also obtain the evolution equations for the order parameter and the fluctuations to one-loop order and in a non-perturbative Hartree approximation in spatially flat FRW cosmologies. The renormalization, and leading behavior of the high temperature limit are analyzed. |
hep-ph/0304140 | Sergey Afonin | V.A. Andrianov and S.S. Afonin | Vector particles in Quasilocal Quark Models | 18 pages | Zap.Nauchn.Semin. 291 (2002) 5 | null | null | hep-ph | null | We consider the Quasilocal Quark Model of NJL type including vector and
axial-vector four-fermion interaction with derivatives. The mass spectrum for
the ground and first excited states is obtained. The chiral symmetry
restoration sum rules in these channels are imposed as matching rules to QCD at
intermediate energies and a set of constraints on parameters of QQM is
performed.
| [
{
"created": "Tue, 15 Apr 2003 10:35:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Andrianov",
"V. A.",
""
],
[
"Afonin",
"S. S.",
""
]
] | We consider the Quasilocal Quark Model of NJL type including vector and axial-vector four-fermion interaction with derivatives. The mass spectrum for the ground and first excited states is obtained. The chiral symmetry restoration sum rules in these channels are imposed as matching rules to QCD at intermediate energies and a set of constraints on parameters of QQM is performed. |
hep-ph/0612161 | Rasmus Mackeprang | Rasmus Mackeprang, Andrea Rizzi | Interactions of Coloured Heavy Stable Particles in Matter | null | Eur.Phys.J.C50:353-362,2007 | 10.1140/epjc/s10052-007-0252-4 | null | hep-ph | null | In this paper we present a physics model for the interactions of stable heavy
hadrons containing a heavy parton with matter. The model presented is a natural
continuation of the work started in hep-ex/0404001. However, changes and
generalisations have been made allowing for the description of a broader scope
of physics scenarios. As a special case the model is tested on the cases of
stable gluino and stop hadrons, thus covering both stable colour triplet and
octet states. Conclusions are drawn regarding the phenomenology of these cases
including how to distinguish between them.
| [
{
"created": "Wed, 13 Dec 2006 11:14:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mackeprang",
"Rasmus",
""
],
[
"Rizzi",
"Andrea",
""
]
] | In this paper we present a physics model for the interactions of stable heavy hadrons containing a heavy parton with matter. The model presented is a natural continuation of the work started in hep-ex/0404001. However, changes and generalisations have been made allowing for the description of a broader scope of physics scenarios. As a special case the model is tested on the cases of stable gluino and stop hadrons, thus covering both stable colour triplet and octet states. Conclusions are drawn regarding the phenomenology of these cases including how to distinguish between them. |
hep-ph/0309129 | Yasutaka Takanishi | C. D. Froggatt, L. V. Laperashvili, H. B. Nielsen, Y. Takanishi | Family Replicated Gauge Group Models | 7 pages, 2 figures, Latex2e, Talk given by L. V. Laperashvili at the
Fifth International Conference ``Symmetry in Nonlinear Mathematical
Physics'', Kyiv, Ukraine, June 23-29, 2003 | EconfC0306234:737-743,2003 | null | null | hep-ph | null | Family Replicated Gauge Group models of the type SU(n)^N\times SU(m)^N,
(SMG)^3 and (SMG\times U(1)_{B-L})^3 are reviewed, where SMG=SU(3)_{c}\times
SU(2)_{L}\times U(1)_{Y} is the gauge symmetry group of the Standard Model, $B$
is the baryon and $L$ is the lepton numbers, respectively. It was shown that
Family Replicated Gauge Group model of the latter type fits the Standard Model
fermion masses and mixing angles and describes all neutrino experiment data
order magnitudewise using only 5 free parameters -- five vacuum expectation
values of the Higgs fields which break the Family Replicated Gauge Group
symmetry to the Standard Model. The possibility of [SU(5)]^3 or [SO(10)]^3
unification at the GUT-scale \sim 10^{18} GeV also is briefly considered.
| [
{
"created": "Thu, 11 Sep 2003 17:38:59 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Froggatt",
"C. D.",
""
],
[
"Laperashvili",
"L. V.",
""
],
[
"Nielsen",
"H. B.",
""
],
[
"Takanishi",
"Y.",
""
]
] | Family Replicated Gauge Group models of the type SU(n)^N\times SU(m)^N, (SMG)^3 and (SMG\times U(1)_{B-L})^3 are reviewed, where SMG=SU(3)_{c}\times SU(2)_{L}\times U(1)_{Y} is the gauge symmetry group of the Standard Model, $B$ is the baryon and $L$ is the lepton numbers, respectively. It was shown that Family Replicated Gauge Group model of the latter type fits the Standard Model fermion masses and mixing angles and describes all neutrino experiment data order magnitudewise using only 5 free parameters -- five vacuum expectation values of the Higgs fields which break the Family Replicated Gauge Group symmetry to the Standard Model. The possibility of [SU(5)]^3 or [SO(10)]^3 unification at the GUT-scale \sim 10^{18} GeV also is briefly considered. |
1605.00575 | Eduardo Rojas | Oscar Rodr\'iguez, Richard H. Benavides, William A. Ponce, Eduardo
Rojas | Flipped versions of the universal 3-3-1 and the left-right symmetric
models in $[SU(3)]^3$: a comprehensive approach | null | Phys. Rev. D 95, 014009 (2017) | 10.1103/PhysRevD.95.014009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By considering the 3-3-1 and the left-right symmetric models as low energy
effective theories of the $SU(3)_C\otimes SU(3)_L\otimes SU(3)_R$~(for short
$[SU(3)]^3$) gauge group, alternative versions of these models are found. The
new neutral gauge bosons of the universal 3-3-1 model and its flipped versions
are presented; also, the left-right symmetric model and its flipped variants
are studied. Our analysis shows that there are two flipped versions of the
universal 3-3-1 model, with the particularity that both of them have the same
weak charges. For the left-right symmetric model we also found two flipped
versions; one of them new in the literature which, unlike those of the 3-3-1,
requires a dedicated study of its electroweak properties. For all the models
analyzed, the couplings of the $Z'$ bosons to the standard model fermions are
reported. The explicit form of the null space of the vector boson mass matrix
for an arbitrary Higgs tensor and gauge group is also presented. In the general
framework of the $[SU(3)]^3$ gauge group, and by using the LHC experimental
results and EW precision data, limits on the $Z'$ mass and the mixing angle
between $Z$ and the new gauge bosons $Z'$ are obtained. The general results
call for very small mixing angles in the range $10^{-3}$ radians and $M_{Z'}>$
2.5 TeV.
| [
{
"created": "Mon, 2 May 2016 17:30:57 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Nov 2016 00:53:10 GMT",
"version": "v2"
}
] | 2017-01-18 | [
[
"Rodríguez",
"Oscar",
""
],
[
"Benavides",
"Richard H.",
""
],
[
"Ponce",
"William A.",
""
],
[
"Rojas",
"Eduardo",
""
]
] | By considering the 3-3-1 and the left-right symmetric models as low energy effective theories of the $SU(3)_C\otimes SU(3)_L\otimes SU(3)_R$~(for short $[SU(3)]^3$) gauge group, alternative versions of these models are found. The new neutral gauge bosons of the universal 3-3-1 model and its flipped versions are presented; also, the left-right symmetric model and its flipped variants are studied. Our analysis shows that there are two flipped versions of the universal 3-3-1 model, with the particularity that both of them have the same weak charges. For the left-right symmetric model we also found two flipped versions; one of them new in the literature which, unlike those of the 3-3-1, requires a dedicated study of its electroweak properties. For all the models analyzed, the couplings of the $Z'$ bosons to the standard model fermions are reported. The explicit form of the null space of the vector boson mass matrix for an arbitrary Higgs tensor and gauge group is also presented. In the general framework of the $[SU(3)]^3$ gauge group, and by using the LHC experimental results and EW precision data, limits on the $Z'$ mass and the mixing angle between $Z$ and the new gauge bosons $Z'$ are obtained. The general results call for very small mixing angles in the range $10^{-3}$ radians and $M_{Z'}>$ 2.5 TeV. |
1903.00063 | Abdel Nasser Tawfik | Abdel Nasser Tawfik (Nile U., ECTP & WLCAPP, Cairo), Igor Mishustin
(Frankfurt U., FIAS & Kurchatov Inst., Moscow) | Equation of State for Cosmological Matter at and beyond QCD and
Electroweak Eras | 17 pages, 4 figures, submitted to PRD | J. Phys. G: Nucl. Part. Phys. 46, 125201 (2019) | 10.1088/1361-6471/ab46d4 | ECTP-2019-02, WLCAPP-2019-02 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various thermodynamic quantities for baryon-free matter are calculated by
combining the most reliable non-perturbative and perturbative calculations,
especially the most recent ones including as many quark flavors as possible. We
extend these calculations by including other degrees of freedom (dof), such as
photons, neutrinos, leptons, electroweak particles, and Higgs bosons, that
allows us to consider the temperatures up to the TeV-scale. The calculations
show that similar to QCD, the EW phase transition is also a crossover. We have
found that while the equation of state for the hadronic matter is linear,
$p/\rho\simeq 0.2$, the one for higher temperatures is rather complex; it
exhibits two crossover-type phase transitions, corresponding to strong and EW
matter. At even larger energy densities, the deduced EoS becomes linear again
and close to ideal gas. The combined equation of state can be used for modeling
the expansion of the Universe from very early times and through the EW and QCD
era.
| [
{
"created": "Thu, 28 Feb 2019 20:41:24 GMT",
"version": "v1"
}
] | 2019-11-05 | [
[
"Tawfik",
"Abdel Nasser",
"",
"Nile U., ECTP & WLCAPP, Cairo"
],
[
"Mishustin",
"Igor",
"",
"Frankfurt U., FIAS & Kurchatov Inst., Moscow"
]
] | Various thermodynamic quantities for baryon-free matter are calculated by combining the most reliable non-perturbative and perturbative calculations, especially the most recent ones including as many quark flavors as possible. We extend these calculations by including other degrees of freedom (dof), such as photons, neutrinos, leptons, electroweak particles, and Higgs bosons, that allows us to consider the temperatures up to the TeV-scale. The calculations show that similar to QCD, the EW phase transition is also a crossover. We have found that while the equation of state for the hadronic matter is linear, $p/\rho\simeq 0.2$, the one for higher temperatures is rather complex; it exhibits two crossover-type phase transitions, corresponding to strong and EW matter. At even larger energy densities, the deduced EoS becomes linear again and close to ideal gas. The combined equation of state can be used for modeling the expansion of the Universe from very early times and through the EW and QCD era. |
1206.5537 | Bjorn Garbrecht | Marco Drewes and Bjorn Garbrecht | Leptogenesis from a GeV Seesaw without Mass Degeneracy | 23 pages | null | 10.1007/JHEP03(2013)096 | TTK-12-28 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For Leptogenesis based on the type-I seesaw mechanism, we present a
systematic calculation of lepton-number violating and purely flavoured
asymmetries within nonequilibrium Quantum Field Theory. We show that sterile
neutrinos with non-degenerate masses in the GeV range can explain the baryon
asymmetry of the Universe via flavoured Leptogenesis. This is possible due to
the interplay of thermal and flavour effects. Our approach clarifies the
relation between Leptogenesis from the oscillations of sterile neutrinos and
the more commonly studied scenarios from decays and inverse decays. We explain
why lower mass bounds for non-degenerate sterile neutrinos derived for
Leptogenesis from out-of-equilibrium decays do not apply to flavoured
Leptogenesis with GeV-scale neutrinos.
| [
{
"created": "Sun, 24 Jun 2012 20:22:46 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Drewes",
"Marco",
""
],
[
"Garbrecht",
"Bjorn",
""
]
] | For Leptogenesis based on the type-I seesaw mechanism, we present a systematic calculation of lepton-number violating and purely flavoured asymmetries within nonequilibrium Quantum Field Theory. We show that sterile neutrinos with non-degenerate masses in the GeV range can explain the baryon asymmetry of the Universe via flavoured Leptogenesis. This is possible due to the interplay of thermal and flavour effects. Our approach clarifies the relation between Leptogenesis from the oscillations of sterile neutrinos and the more commonly studied scenarios from decays and inverse decays. We explain why lower mass bounds for non-degenerate sterile neutrinos derived for Leptogenesis from out-of-equilibrium decays do not apply to flavoured Leptogenesis with GeV-scale neutrinos. |
hep-ph/0506300 | Bo-Qiang Ma | Puze Gao, Bo-Qiang Ma | Probing nucleon strange asymmetry from charm production in neutrino deep
inelastic scattering | 6 Latex pages, no figure, final version to appear in EPJC | Eur.Phys.J.C44:63-68,2005 | 10.1140/epjc/s2005-02335-5 | null | hep-ph hep-ex nucl-ex nucl-th | null | We propose a means to detect the nucleon strange quark-antiquark asymmetry,
which is predicted as a non-perturbative effect, but still unchecked directly
by available experiments. The difference for the $D(c\bar{q})$ and
$\bar{D}(\bar{c}q)$ meson production cross sections in neutrino and
antineutrino induced charged current deep inelastic scattering is illustrated
to be sensitive to the nucleon strange asymmetry. Prospect is given and the
effect due to the light quark fragmentation is also discussed for the
extraction of the strange asymmetry in future experiments.
| [
{
"created": "Tue, 28 Jun 2005 23:04:53 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jul 2005 04:13:49 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Gao",
"Puze",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We propose a means to detect the nucleon strange quark-antiquark asymmetry, which is predicted as a non-perturbative effect, but still unchecked directly by available experiments. The difference for the $D(c\bar{q})$ and $\bar{D}(\bar{c}q)$ meson production cross sections in neutrino and antineutrino induced charged current deep inelastic scattering is illustrated to be sensitive to the nucleon strange asymmetry. Prospect is given and the effect due to the light quark fragmentation is also discussed for the extraction of the strange asymmetry in future experiments. |
2205.04477 | Bruno Scheihing Hitschfeld | Bruno Scheihing-Hitschfeld and Xiaojun Yao | Gauge Invariance of Non-Abelian Field Strength Correlators: the Axial
Gauge Puzzle | 16 pages, 2 figures; v2: published version | Phys.Rev.Lett. 130 (2023) 5, 052302 | 10.1103/PhysRevLett.130.052302 | MIT-CTP/5425, IQuS@UW-21-040 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many transport coefficients of the quark-gluon plasma and nuclear structure
functions can be written as gauge invariant correlation functions of
non-Abelian field strengths dressed with Wilson lines. We discuss the
applicability of axial gauge $n\cdot A=0$ to calculate them. In particular, we
address issues that appear when one attempts to trivialize the Wilson lines in
the correlation functions by gauge-fixing. We find it is always impossible to
completely remove the gauge fields $n\cdot A$ in Wilson lines that extend to
infinity in the $n$-direction by means of gauge transformations. We show how
the obstruction appears in an explicit example of a perturbative calculation,
and we also explain it more generally from the perspective of the path integral
that defines the theory. Our results explain why the two correlators that
define the heavy quark and quarkonium transport coefficients, which are
seemingly equal in axial gauge, are actually different physical quantities of
the quark-gluon plasma and have different values. Furthermore, our findings
provide insights into the difference between two inequivalent gluon parton
distribution functions.
| [
{
"created": "Mon, 9 May 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Feb 2023 21:28:33 GMT",
"version": "v2"
}
] | 2023-02-09 | [
[
"Scheihing-Hitschfeld",
"Bruno",
""
],
[
"Yao",
"Xiaojun",
""
]
] | Many transport coefficients of the quark-gluon plasma and nuclear structure functions can be written as gauge invariant correlation functions of non-Abelian field strengths dressed with Wilson lines. We discuss the applicability of axial gauge $n\cdot A=0$ to calculate them. In particular, we address issues that appear when one attempts to trivialize the Wilson lines in the correlation functions by gauge-fixing. We find it is always impossible to completely remove the gauge fields $n\cdot A$ in Wilson lines that extend to infinity in the $n$-direction by means of gauge transformations. We show how the obstruction appears in an explicit example of a perturbative calculation, and we also explain it more generally from the perspective of the path integral that defines the theory. Our results explain why the two correlators that define the heavy quark and quarkonium transport coefficients, which are seemingly equal in axial gauge, are actually different physical quantities of the quark-gluon plasma and have different values. Furthermore, our findings provide insights into the difference between two inequivalent gluon parton distribution functions. |
1912.07550 | Alessandro Bacchetta | Alessandro Bacchetta, Valerio Bertone, Chiara Bissolotti, Giuseppe
Bozzi, Filippo Delcarro, Fulvio Piacenza, Marco Radici | Transverse-momentum-dependent parton distributions up to N$^3$LL from
Drell-Yan data | Latest version: added panels in Fig. 4, added chi2 values in Fig. 8,
changes in App. C, extended discussion on comparison with ATLAS data (Sec.
4.1), footnote 5 added, other small changes in the text | null | 10.1007/JHEP07(2020)117 | JLAB-THY-19-3121 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an extraction of unpolarised Transverse-Momentum-Dependent Parton
Distribution Functions based on Drell-Yan production data from different
experiments, including those at the LHC, and spanning a wide kinematic range.
We deal with experimental uncertainties by properly taking into account
correlations. We include resummation of logarithms of the transverse momentum
of the vector boson up to N$^3$LL order, and we include non-perturbative
contributions. These ingredients allow us to obtain a remarkable agreement with
the data.
| [
{
"created": "Mon, 16 Dec 2019 17:56:28 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2019 22:47:51 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Jun 2020 08:38:52 GMT",
"version": "v3"
}
] | 2020-08-26 | [
[
"Bacchetta",
"Alessandro",
""
],
[
"Bertone",
"Valerio",
""
],
[
"Bissolotti",
"Chiara",
""
],
[
"Bozzi",
"Giuseppe",
""
],
[
"Delcarro",
"Filippo",
""
],
[
"Piacenza",
"Fulvio",
""
],
[
"Radici",
"Marco",
""
]
] | We present an extraction of unpolarised Transverse-Momentum-Dependent Parton Distribution Functions based on Drell-Yan production data from different experiments, including those at the LHC, and spanning a wide kinematic range. We deal with experimental uncertainties by properly taking into account correlations. We include resummation of logarithms of the transverse momentum of the vector boson up to N$^3$LL order, and we include non-perturbative contributions. These ingredients allow us to obtain a remarkable agreement with the data. |
hep-ph/0102239 | Mikhail Voloshin | M.B. Voloshin | Once again on electromagnetic properties of a domain wall interacting
with charged fermions | 15 pages | Phys.Rev. D63 (2001) 125012 | 10.1103/PhysRevD.63.125012 | TPI-MINN-01/10-T, UMN-TH-1942-01 | hep-ph hep-th | null | The response to a magnetic flux is considered of the vacuum state of charged
Dirac fermions interacting with a domain wall made of a neutral spinless field
in (3+1) dimensions with the fermion mass having a phase variation across the
wall. It is pointed out that due to simple C parity arguments the spontaneous
magnetization for this system is necessarily zero, thus invalidating some
claims to the contrary in the literature. The cancellation of the spontaneous
magnetization is explicitly demonstrated in a particular class of models. The
same calculation produces a general formula for the electric charge density
induced by the magnetic flux -- an effect previously discussed in the
literature for axionic domain walls. The distribution of the induced charge is
calculated in specific models.
| [
{
"created": "Mon, 19 Feb 2001 20:11:23 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Voloshin",
"M. B.",
""
]
] | The response to a magnetic flux is considered of the vacuum state of charged Dirac fermions interacting with a domain wall made of a neutral spinless field in (3+1) dimensions with the fermion mass having a phase variation across the wall. It is pointed out that due to simple C parity arguments the spontaneous magnetization for this system is necessarily zero, thus invalidating some claims to the contrary in the literature. The cancellation of the spontaneous magnetization is explicitly demonstrated in a particular class of models. The same calculation produces a general formula for the electric charge density induced by the magnetic flux -- an effect previously discussed in the literature for axionic domain walls. The distribution of the induced charge is calculated in specific models. |
1106.0193 | Su-Zhi Wu | Yu-Qi Chen and Su-Zhi Wu | Production of Triply Heavy Baryons at LHC | 32 pages, 7 figures, to appear in JHEP | null | 10.1007/JHEP08(2011)144 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Triply heavy baryons are very interesting hadrons to be explored for they
provide particular information about strong interactions, hadron structures,
and weak decays of heavy baryons. We calculate the hadronic production cross
sections of the \Omega_{ccc} and the \Omega_{ccb}, which are dominated by the
gg fusion subprocesses containing 4362 and 1454 Feynman diagrams, respectively.
A method for generating and calculating tree level Feynman diagrams
automatically is developed to deal with complicated processes containing so
many diagrams. Our results show that 10^4-10^5 events of triply heavy baryons
can be accumulated for 10 fb^{-1} integrated luminosity at LHC. Signatures of
the triply heavy baryons are pointed out, with emphasis on the decay modes
\Omega_{ccc} -> \Omega_{sss} + 3 \pi^+ and \Omega_{ccb} -> \Omega_{sss} + 3
\pi^+ +\pi^-. We conclude that it is quite promising to discover them at LHC.
| [
{
"created": "Wed, 1 Jun 2011 14:43:41 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jun 2011 14:54:30 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jun 2011 10:50:30 GMT",
"version": "v3"
},
{
"created": "Tue, 30 Aug 2011 10:01:37 GMT",
"version": "v4"
}
] | 2015-05-28 | [
[
"Chen",
"Yu-Qi",
""
],
[
"Wu",
"Su-Zhi",
""
]
] | Triply heavy baryons are very interesting hadrons to be explored for they provide particular information about strong interactions, hadron structures, and weak decays of heavy baryons. We calculate the hadronic production cross sections of the \Omega_{ccc} and the \Omega_{ccb}, which are dominated by the gg fusion subprocesses containing 4362 and 1454 Feynman diagrams, respectively. A method for generating and calculating tree level Feynman diagrams automatically is developed to deal with complicated processes containing so many diagrams. Our results show that 10^4-10^5 events of triply heavy baryons can be accumulated for 10 fb^{-1} integrated luminosity at LHC. Signatures of the triply heavy baryons are pointed out, with emphasis on the decay modes \Omega_{ccc} -> \Omega_{sss} + 3 \pi^+ and \Omega_{ccb} -> \Omega_{sss} + 3 \pi^+ +\pi^-. We conclude that it is quite promising to discover them at LHC. |
hep-ph/9307232 | Wai-Yee | Darwin Chang, Wai-Yee Keung, and Ivan Phillips | CP Violating Observables in $e^-e^+ \to W^-W^+$ | 23 pages, plus 11 postscript graphs not posted before | Phys.Rev.D48:4045-4061,1993 | 10.1103/PhysRevD.48.4045 | CERN-TH.6839/93 | hep-ph | null | We consider various integrated lepton charge-energy asymmetries and azimuthal
asymmetries as tests of CP violation in the process $e^-e^+ \to W^-W^+$. These
asymmetries are sensitive to different linear combinations of the CP violating
form factors in the three gauge boson $W^-W^+$ production vertex, and can
distinguish dispersive and absorptive parts of the form factors. It makes use
of purely hadronic and purely leptonic modes of $W$'s decays as well as the
mixed modes. The techniques of using the kinematics of jets or missing momentum
to construct CP--odd observables are also employed. These CP violating
observables are illustrated in the generalized Left-Right Model and the Charged
Higgs Model.
| [
{
"created": "Thu, 8 Jul 1993 09:18:04 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jun 1998 04:33:14 GMT",
"version": "v2"
}
] | 2009-09-01 | [
[
"Chang",
"Darwin",
""
],
[
"Keung",
"Wai-Yee",
""
],
[
"Phillips",
"Ivan",
""
]
] | We consider various integrated lepton charge-energy asymmetries and azimuthal asymmetries as tests of CP violation in the process $e^-e^+ \to W^-W^+$. These asymmetries are sensitive to different linear combinations of the CP violating form factors in the three gauge boson $W^-W^+$ production vertex, and can distinguish dispersive and absorptive parts of the form factors. It makes use of purely hadronic and purely leptonic modes of $W$'s decays as well as the mixed modes. The techniques of using the kinematics of jets or missing momentum to construct CP--odd observables are also employed. These CP violating observables are illustrated in the generalized Left-Right Model and the Charged Higgs Model. |
hep-ph/0602064 | Yuichiro Kiyo | Y. Kiyo | Third order Coulomb correction to ttbar threshold cross section | To appear in the proceedings of the 7th International Symposium on
Radiative Corrections(RADCOR05), Shonan Village, Japana Oct. 2005 | Nucl.Phys.Proc.Suppl.157:221-225,2006 | 10.1016/j.nuclphysbps.2006.03.051 | PITHA 06/03 | hep-ph | null | We report on our result of third order Coulomb correction to the cross
section sigma(ee -> ttbar) near threshold. Analytic expression for the Coulomb
energy and wave function at the origin are obtained. We discuss the
significance of the Coulomb correction to the threshold cross section and heavy
quarkonium phenomenology.
| [
{
"created": "Tue, 7 Feb 2006 16:14:48 GMT",
"version": "v1"
}
] | 2011-06-24 | [
[
"Kiyo",
"Y.",
""
]
] | We report on our result of third order Coulomb correction to the cross section sigma(ee -> ttbar) near threshold. Analytic expression for the Coulomb energy and wave function at the origin are obtained. We discuss the significance of the Coulomb correction to the threshold cross section and heavy quarkonium phenomenology. |
hep-ph/9302302 | Geert Jan van Oldenborgh | Frank Cuypers, Geert Jan van Oldenborgh and Reinhold R\"uckl | Supersymmetric Signals in $\gamma\gamma$ Collisions | 12 pages + 6 pages figures (included as uufile, also with anon. ftp
from gluon.hep.physik.uni-muenchen.de (129.187.198.1)), LaTeX (axodraw,epsf),
CERN-TH.6742/92, MPI-Ph/92-73, LMU-92/07. (forgot the bibliography file - my
excuses) | Nucl.Phys. B409 (1993) 144-160 | 10.1016/0550-3213(93)90450-4 | null | hep-ph | null | We study the occurrence of final states with only an electron-positron pair
and missing transverse momentum as a signal of \susy\ in photon-photon
collisions. Suitable high energy photon beams may be provided at linear
colliders by back-scattering laser beams on electron beams. The final states
considered represent a typical signature for the production and decay of
selctron and chargino pairs within the \mssm. We show that, away from the
kinematical threshold, selctrons produce this signal far more abundantly than
charginos. The standard model background is dominated by W-pair production. We
propose a series of kinematical cuts which reduce this background to an
acceptable level. With a 1 TeV collider operated in the $\gamma\gamma$-mode, we
find that interesting and complementary tests of \susic\ models can be
performed for selctron masses up to 350 GeV.
| [
{
"created": "Wed, 24 Feb 1993 15:54:08 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Feb 1993 07:43:45 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Feb 1993 09:00:01 GMT",
"version": "v3"
}
] | 2009-10-22 | [
[
"Cuypers",
"Frank",
""
],
[
"van Oldenborgh",
"Geert Jan",
""
],
[
"Rückl",
"Reinhold",
""
]
] | We study the occurrence of final states with only an electron-positron pair and missing transverse momentum as a signal of \susy\ in photon-photon collisions. Suitable high energy photon beams may be provided at linear colliders by back-scattering laser beams on electron beams. The final states considered represent a typical signature for the production and decay of selctron and chargino pairs within the \mssm. We show that, away from the kinematical threshold, selctrons produce this signal far more abundantly than charginos. The standard model background is dominated by W-pair production. We propose a series of kinematical cuts which reduce this background to an acceptable level. With a 1 TeV collider operated in the $\gamma\gamma$-mode, we find that interesting and complementary tests of \susic\ models can be performed for selctron masses up to 350 GeV. |
1206.5447 | Rashidul Islam | Mamta Dahiya, Sukanta Dutta, Rashidul Islam | Constraining Unparticles from Top Physics at TeVatron | 37 pages, 24 figures, 1 new figure and some discussions added,
references updated, to appear in Physical Review D | null | 10.1103/PhysRevD.86.115022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study and analyze the recent observations of the top pair production
$\sigma (p\bar p\to t \bar t)$ at TeVatron through flavor conserving and flavor
violating channels ${\it via}$ vector and tensor unparticles. The unparticle
sector is considered with the possibility of being a color singlet or octet.
The modified unparticle propagator is used to investigate the contribution of
these unparticles to the observed $A_{FB}^{t\bar t}$ (forward backward
asymmetry in top pair production) and the spin correlation at TeVatron. We have
also studied the impact of the flavor violating couplings of unparticles to the
third generation quarks on (a) pair production of same sign tops/antitops
$\sigma (p\bar p\to tt+\bar t \bar t)$ at TeVatron and (b) the partial top
decay width for $\Gamma_{\cal U}(t\to u\,{\cal U}^V)$.
We find that a large region of parameter space is consistent with the
measurements of \tt production cross-section, \afbt and spin correlation
coefficient at TeVatron and observe that the top decay width measurement
constrains the flavor violating coupling of vector unparticles more severely
than the same sign top/antitop production at TeVatron. We also predict the best
point-set in the model parameter space for specific choices of \du
corresponding to $\chi^2_{\rm min}$ evaluated using the \mttb spectrum of \afbt
from the data set of Run II of TeVatron at the integrated luminosity 8.7
fb$^{-1}$. Our results and analysis are consistent even with unparticle
theories having broken scale invariance as long as the infrared cut-off scale
is much less than the top pair production threshold.
| [
{
"created": "Sat, 23 Jun 2012 22:51:47 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jul 2012 07:01:08 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Nov 2012 07:14:27 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Dahiya",
"Mamta",
""
],
[
"Dutta",
"Sukanta",
""
],
[
"Islam",
"Rashidul",
""
]
] | We study and analyze the recent observations of the top pair production $\sigma (p\bar p\to t \bar t)$ at TeVatron through flavor conserving and flavor violating channels ${\it via}$ vector and tensor unparticles. The unparticle sector is considered with the possibility of being a color singlet or octet. The modified unparticle propagator is used to investigate the contribution of these unparticles to the observed $A_{FB}^{t\bar t}$ (forward backward asymmetry in top pair production) and the spin correlation at TeVatron. We have also studied the impact of the flavor violating couplings of unparticles to the third generation quarks on (a) pair production of same sign tops/antitops $\sigma (p\bar p\to tt+\bar t \bar t)$ at TeVatron and (b) the partial top decay width for $\Gamma_{\cal U}(t\to u\,{\cal U}^V)$. We find that a large region of parameter space is consistent with the measurements of \tt production cross-section, \afbt and spin correlation coefficient at TeVatron and observe that the top decay width measurement constrains the flavor violating coupling of vector unparticles more severely than the same sign top/antitop production at TeVatron. We also predict the best point-set in the model parameter space for specific choices of \du corresponding to $\chi^2_{\rm min}$ evaluated using the \mttb spectrum of \afbt from the data set of Run II of TeVatron at the integrated luminosity 8.7 fb$^{-1}$. Our results and analysis are consistent even with unparticle theories having broken scale invariance as long as the infrared cut-off scale is much less than the top pair production threshold. |
1504.06019 | Hee Sok Chung | Geoffrey T. Bodwin, Hee Sok Chung (Argonne), U-Rae Kim, Jungil Lee
(Korea U.) | Fragmentation contributions to $J/\psi$ photoproduction at HERA | 16 pages, 6 figures, minor revisions, version published in Phys. Rev.
D | Phys. Rev. D 92, 074042 (2015) | 10.1103/PhysRevD.92.074042 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute leading-power fragmentation corrections to $J/\psi$
photoproduction at DESY HERA, making use of the nonrelativistic QCD
factorization approach. Our calculations include parton production cross
sections through order $\alpha_s^3$, fragmentation functions though order
$\alpha_s^2$, and leading logarithms of the transverse momentum divided by the
charm-quark mass to all orders in $\alpha_s$. We find that the leading-power
fragmentation corrections, beyond those that are included through
next-to-leading order in $\alpha_s$, are small relative to the fixed-order
contributions through next-to-leading order in $\alpha_s$. Consequently, an
important discrepancy remains between the experimental measurements of the
$J/\psi$ photoproduction cross section and predictions that make use of
nonrelativistic-QCD long-distance matrix elements that are extracted from the
$J/\psi$ hadroproduction cross-section and polarization data.
| [
{
"created": "Thu, 23 Apr 2015 01:19:21 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2015 16:11:11 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Nov 2015 16:23:44 GMT",
"version": "v3"
}
] | 2015-11-19 | [
[
"Bodwin",
"Geoffrey T.",
"",
"Argonne"
],
[
"Chung",
"Hee Sok",
"",
"Argonne"
],
[
"Kim",
"U-Rae",
"",
"Korea U."
],
[
"Lee",
"Jungil",
"",
"Korea U."
]
] | We compute leading-power fragmentation corrections to $J/\psi$ photoproduction at DESY HERA, making use of the nonrelativistic QCD factorization approach. Our calculations include parton production cross sections through order $\alpha_s^3$, fragmentation functions though order $\alpha_s^2$, and leading logarithms of the transverse momentum divided by the charm-quark mass to all orders in $\alpha_s$. We find that the leading-power fragmentation corrections, beyond those that are included through next-to-leading order in $\alpha_s$, are small relative to the fixed-order contributions through next-to-leading order in $\alpha_s$. Consequently, an important discrepancy remains between the experimental measurements of the $J/\psi$ photoproduction cross section and predictions that make use of nonrelativistic-QCD long-distance matrix elements that are extracted from the $J/\psi$ hadroproduction cross-section and polarization data. |
hep-ph/0409138 | Marco Peloso | Jihn E. Kim, Hans Peter Nilles, Marco Peloso | Completing Natural Inflation | 9 pages, 1 figure | JCAP 0501 (2005) 005 | 10.1088/1475-7516/2005/01/005 | null | hep-ph astro-ph hep-th | null | If the inflaton is a pseudo-scalar axion, the axion shift symmetry can
protect the flatness of its potential from too large radiative corrections.
This possibility, known as natural inflation, requires an axion scale which is
greater than the (reduced) Planck scale. It is unclear whether such a high
value is compatible with an effective field theoretical description, and if the
global axionic symmetry survives quantum gravity effects. We propose a
mechanism which provides an effective large axion scale, although the original
one is sub-Planckian. The mechanism is based on the presence of two axions,
with a potential provided by two anomalous gauge groups. The effective large
axion scale is due to an almost exact symmetry between the couplings of the
axions to the anomalous groups. We also comment on a possible implementation in
heterotic string theory.
| [
{
"created": "Sun, 12 Sep 2004 17:01:44 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kim",
"Jihn E.",
""
],
[
"Nilles",
"Hans Peter",
""
],
[
"Peloso",
"Marco",
""
]
] | If the inflaton is a pseudo-scalar axion, the axion shift symmetry can protect the flatness of its potential from too large radiative corrections. This possibility, known as natural inflation, requires an axion scale which is greater than the (reduced) Planck scale. It is unclear whether such a high value is compatible with an effective field theoretical description, and if the global axionic symmetry survives quantum gravity effects. We propose a mechanism which provides an effective large axion scale, although the original one is sub-Planckian. The mechanism is based on the presence of two axions, with a potential provided by two anomalous gauge groups. The effective large axion scale is due to an almost exact symmetry between the couplings of the axions to the anomalous groups. We also comment on a possible implementation in heterotic string theory. |
hep-ph/9511343 | Paul Frampton | Paul H. Frampton and Otto C. W. Kong | Dicyclic Horizontal Symmetry and Supersymmetric Grand Unification | 10 pages, LaTeX | Phys.Rev. D53 (1996) 2293-2295 | 10.1103/PhysRevD.53.R2293 | IFP-715-UNC | hep-ph | null | It is shown how to use as horizontal symmetry the dicyclic group $Q_6 \subset
SU(2)$ in a supersymmetric unification $SU(5)\otimes SU(5)\otimes SU(2)$ where
one $SU(5)$ acts on the first and second families, in a horizontal doublet, and
the other acts on the third. This can lead to acceptable quark masses and
mixings, with an economic choice of matter supermultiplets, and charged lepton
masses can be accommodated.
| [
{
"created": "Thu, 16 Nov 1995 16:04:44 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Frampton",
"Paul H.",
""
],
[
"Kong",
"Otto C. W.",
""
]
] | It is shown how to use as horizontal symmetry the dicyclic group $Q_6 \subset SU(2)$ in a supersymmetric unification $SU(5)\otimes SU(5)\otimes SU(2)$ where one $SU(5)$ acts on the first and second families, in a horizontal doublet, and the other acts on the third. This can lead to acceptable quark masses and mixings, with an economic choice of matter supermultiplets, and charged lepton masses can be accommodated. |
hep-ph/0007292 | Bernd Andreas Kniehl | Bernd A. Kniehl, Jungil Lee (Hamburg University) | Polarized J/psi from chi_{cJ} and psi' Decays at the Tevatron | 17 pages (Latex), 1 figure (Postscript) | Phys.Rev.D62:114027,2000 | 10.1103/PhysRevD.62.114027 | DESY 00-107 | hep-ph | null | We calculate the partonic cross sections for the hadroproduction of polarized
chi_{cJ} mesons using the factorization formalism of nonrelativistic QCD. We
also describe how the polarization is passed on to the J/psi mesons in the
radiative feed-down chi_{cJ} -> J/psi + gamma and in the double-cascade decays
of psi' mesons via chi_{cJ} intermediate states. These represent the missing
ingredients needed to predict the polarization of prompt J/psi mesons at the
Fermilab Tevatron.
| [
{
"created": "Wed, 26 Jul 2000 11:47:37 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Kniehl",
"Bernd A.",
"",
"Hamburg University"
],
[
"Lee",
"Jungil",
"",
"Hamburg University"
]
] | We calculate the partonic cross sections for the hadroproduction of polarized chi_{cJ} mesons using the factorization formalism of nonrelativistic QCD. We also describe how the polarization is passed on to the J/psi mesons in the radiative feed-down chi_{cJ} -> J/psi + gamma and in the double-cascade decays of psi' mesons via chi_{cJ} intermediate states. These represent the missing ingredients needed to predict the polarization of prompt J/psi mesons at the Fermilab Tevatron. |
1601.04472 | Allen Caldwell | Allen Caldwell | The evolution of $\sigma^{\gamma P}$ with coherence length | null | null | 10.1088/1367-2630/18/7/073019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming the form $\sigma^{\gamma P} \propto l^{\lambda_{\rm eff}}$ at fixed
$Q^2$ for the behavior of the virtual-photon proton scattering cross section,
where $l$ is the coherence length of the photon fluctuations, it is seen that
the extrapolated values of $\sigma^{\gamma P}$ for different $Q^2$ cross for
$l\approx 10^8$~fm. It is argued that this behavior is not physical, and that
the behavior of the cross sections must change before this coherence length $l$
is reached. This could set the scale for the onset of saturation of parton
densities.
| [
{
"created": "Mon, 18 Jan 2016 11:21:33 GMT",
"version": "v1"
}
] | 2016-08-03 | [
[
"Caldwell",
"Allen",
""
]
] | Assuming the form $\sigma^{\gamma P} \propto l^{\lambda_{\rm eff}}$ at fixed $Q^2$ for the behavior of the virtual-photon proton scattering cross section, where $l$ is the coherence length of the photon fluctuations, it is seen that the extrapolated values of $\sigma^{\gamma P}$ for different $Q^2$ cross for $l\approx 10^8$~fm. It is argued that this behavior is not physical, and that the behavior of the cross sections must change before this coherence length $l$ is reached. This could set the scale for the onset of saturation of parton densities. |
hep-ph/0506153 | Stefan W. Bosch | Stefan W. Bosch | CKM Overview and Determinations from B Decays | Contributed to XXXXth Rencontres de Moriond on Electroweak
Interactions and Unified Theories, La Thuile, March 5-12 2005 | null | null | PITHA-05-08 | hep-ph | null | This talk gives an introduction to the Standard Model
Cabibbo-Kobayashi-Maskawa matrix and methods to extract information on the
parameters of the unitarity triangle from B decays.
| [
{
"created": "Thu, 16 Jun 2005 10:04:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bosch",
"Stefan W.",
""
]
] | This talk gives an introduction to the Standard Model Cabibbo-Kobayashi-Maskawa matrix and methods to extract information on the parameters of the unitarity triangle from B decays. |
1807.02121 | Gauthier Durieux | Gauthier Durieux, Mart\'in Perell\'o, Marcel Vos and Cen Zhang | Global and optimal probes for the top-quark effective field theory at
future lepton colliders | 6 appendices, 66 pages, 37 figures, 10 tables, codes and numerics at
https://github.com/gdurieux/optimal_observables_ee2tt2bwbw | null | 10.1007/JHEP10(2018)168 | DESY 18-096, IFIC 18-27 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We study the sensitivity to physics beyond the standard model of precise
top-quark pair production measurements at future lepton colliders. A global
effective-field-theory approach is employed, including all dimension-six
operators of the Warsaw basis which involve a top-quark and give rise to
tree-level amplitudes that interfere with standard-model $e^+e^-\to t\,\bar
t\to bW^+\bar bW^-$ ones in the limit of vanishing $b$-quark mass. Four-fermion
and CP-violating contributions are taken into account. Circular-collider-, ILC-
and CLIC-like benchmark run scenarios are examined. We compare the constraining
power of various observables to a set of statistically optimal ones which
maximally exploit the information contained in the fully differential $bW^+\bar
bW^-$ distribution. The enhanced sensitivity gained on the linear contributions
of dimension-six operators leads to bounds that are insensitive to quadratic
ones. Even with statistically optimal observables, two centre-of-mass energies
are required for constraining simultaneously two- and four-fermion operators.
The impact of the centre-of-mass energy lever arm is discussed, that of beam
polarization as well. A realistic estimate of the precision that can be
achieved in ILC- and CLIC-like operating scenarios yields individual limits on
the electroweak couplings of the top quark that are one to three orders of
magnitude better than constraints set with Tevatron and LHC run I data, and
three to two hundred times better than the most optimistic projections made for
the high-luminosity phase of the LHC. Clean global constraints can moreover be
obtained at lepton colliders, robustly covering the multidimensional
effective-field-theory space with minimal model dependence.
| [
{
"created": "Thu, 5 Jul 2018 18:00:02 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Durieux",
"Gauthier",
""
],
[
"Perelló",
"Martín",
""
],
[
"Vos",
"Marcel",
""
],
[
"Zhang",
"Cen",
""
]
] | We study the sensitivity to physics beyond the standard model of precise top-quark pair production measurements at future lepton colliders. A global effective-field-theory approach is employed, including all dimension-six operators of the Warsaw basis which involve a top-quark and give rise to tree-level amplitudes that interfere with standard-model $e^+e^-\to t\,\bar t\to bW^+\bar bW^-$ ones in the limit of vanishing $b$-quark mass. Four-fermion and CP-violating contributions are taken into account. Circular-collider-, ILC- and CLIC-like benchmark run scenarios are examined. We compare the constraining power of various observables to a set of statistically optimal ones which maximally exploit the information contained in the fully differential $bW^+\bar bW^-$ distribution. The enhanced sensitivity gained on the linear contributions of dimension-six operators leads to bounds that are insensitive to quadratic ones. Even with statistically optimal observables, two centre-of-mass energies are required for constraining simultaneously two- and four-fermion operators. The impact of the centre-of-mass energy lever arm is discussed, that of beam polarization as well. A realistic estimate of the precision that can be achieved in ILC- and CLIC-like operating scenarios yields individual limits on the electroweak couplings of the top quark that are one to three orders of magnitude better than constraints set with Tevatron and LHC run I data, and three to two hundred times better than the most optimistic projections made for the high-luminosity phase of the LHC. Clean global constraints can moreover be obtained at lepton colliders, robustly covering the multidimensional effective-field-theory space with minimal model dependence. |
1809.10290 | Ahmad Jafar Arifi | A. J. Arifi, H. Nagahiro, A. Hosaka | Three-Body Decay of $\Lambda_c^{*}(2595)$ and $\Lambda_c^{*}(2625)$ with
the Inclusion of Direct Two-Pion Coupling | 11 pages, 15 figures | Phys. Rev. D 98, 114007 (2018) | 10.1103/PhysRevD.98.114007 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the three-body decays of $\Lambda_c^*(2595)$ and
$\Lambda_c^*(2625)$ into $\Lambda_c \pi \pi$ by including a direct process
going through the two-pion coupling of $\Lambda_c^*\Lambda_c \pi \pi$ in
addition to the sequential processes going through $\Sigma_c(2455)$ and
$\Sigma_c^*(2520)$. The strength of the direct coupling is related to that of
the Yukawa coupling by the chiral partner structure between $\Lambda_c$'s and
$\Sigma_c$'s, while the strength of the Yukawa coupling is estimated by the
quark model. It is found that the direct process gives a considerable
contribution especially in the decay of $\Lambda_c^*(2625)$. A clear indication
of the direct process is seen in an asymmetric pattern in the angular
correlation between the two pions. We discuss the usefulness of the detailed
analysis of the decays for the study of the structure of $\Lambda_c^*$.
| [
{
"created": "Thu, 27 Sep 2018 01:04:01 GMT",
"version": "v1"
}
] | 2018-12-19 | [
[
"Arifi",
"A. J.",
""
],
[
"Nagahiro",
"H.",
""
],
[
"Hosaka",
"A.",
""
]
] | We investigate the three-body decays of $\Lambda_c^*(2595)$ and $\Lambda_c^*(2625)$ into $\Lambda_c \pi \pi$ by including a direct process going through the two-pion coupling of $\Lambda_c^*\Lambda_c \pi \pi$ in addition to the sequential processes going through $\Sigma_c(2455)$ and $\Sigma_c^*(2520)$. The strength of the direct coupling is related to that of the Yukawa coupling by the chiral partner structure between $\Lambda_c$'s and $\Sigma_c$'s, while the strength of the Yukawa coupling is estimated by the quark model. It is found that the direct process gives a considerable contribution especially in the decay of $\Lambda_c^*(2625)$. A clear indication of the direct process is seen in an asymmetric pattern in the angular correlation between the two pions. We discuss the usefulness of the detailed analysis of the decays for the study of the structure of $\Lambda_c^*$. |
1209.5416 | Tom Steele | T.G. Steele, Zhi-Wei Wang | Is Radiative Electroweak Symmetry Breaking Consistent with a 125 GeV
Higgs Mass? | 5 pages, 3 eps figures included with LaTeX source. v3 contains
extended analysis and discussion | Phys. Rev. Lett. 110 (2013) 151601 | 10.1103/PhysRevLett.110.151601 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mechanism of radiative electroweak symmetry breaking occurs through loop
corrections, and unlike conventional symmetry breaking where the Higgs mass is
a parameter, the radiatively-generated Higgs mass is dynamically predicted.
Pade approximations and an averaging method are developed to extend the Higgs
mass predictions in radiative electroweak symmetry breaking from five- to
nine-loop order in the scalar sector of the Standard Model, resulting in an
upper bound on the Higgs mass of 141 GeV. The mass predictions are
well-described by a geometric series behaviour, converging to an asymptotic
Higgs mass of 124 GeV consistent with the recent ATLAS/CMS observations.
Similarly, we find that the Higgs self-coupling converges to $\lambda=0.23$,
which is significantly larger than its conventional symmetry breaking
counterpart for a 124 GeV Higgs mass. In addition to this significant
enhancement of the Higgs self-coupling and $HH\rightarrow HH$ scattering, we
find that Higgs decays to gauge bosons are unaltered and the scattering
processes $W_{L}^{+}W_{L}^{+}\rightarrow HH$, $Z_{L}Z_{L}\rightarrow HH$ are
also enhanced, providing signals to distinguish conventional and radiative
electroweak symmetry breaking mechanisms.
| [
{
"created": "Mon, 24 Sep 2012 20:46:26 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2012 21:23:40 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Apr 2013 16:35:57 GMT",
"version": "v3"
}
] | 2013-08-22 | [
[
"Steele",
"T. G.",
""
],
[
"Wang",
"Zhi-Wei",
""
]
] | The mechanism of radiative electroweak symmetry breaking occurs through loop corrections, and unlike conventional symmetry breaking where the Higgs mass is a parameter, the radiatively-generated Higgs mass is dynamically predicted. Pade approximations and an averaging method are developed to extend the Higgs mass predictions in radiative electroweak symmetry breaking from five- to nine-loop order in the scalar sector of the Standard Model, resulting in an upper bound on the Higgs mass of 141 GeV. The mass predictions are well-described by a geometric series behaviour, converging to an asymptotic Higgs mass of 124 GeV consistent with the recent ATLAS/CMS observations. Similarly, we find that the Higgs self-coupling converges to $\lambda=0.23$, which is significantly larger than its conventional symmetry breaking counterpart for a 124 GeV Higgs mass. In addition to this significant enhancement of the Higgs self-coupling and $HH\rightarrow HH$ scattering, we find that Higgs decays to gauge bosons are unaltered and the scattering processes $W_{L}^{+}W_{L}^{+}\rightarrow HH$, $Z_{L}Z_{L}\rightarrow HH$ are also enhanced, providing signals to distinguish conventional and radiative electroweak symmetry breaking mechanisms. |
hep-ph/0205143 | Arthur Hebecker | Arthur Hebecker, John March-Russell | The Flavour Hierarchy and See-Saw Neutrinos from Bulk Masses in 5d
Orbifold GUTs | 10 pages LaTeX, 1 figure. Minor comments and reference added. Version
to be published in PLB | Phys.Lett. B541 (2002) 338-345 | 10.1016/S0370-2693(02)02244-X | CERN-TH/2002-101 | hep-ph | null | In supersymmetric grand unified theories (GUTs) based on S^1/(Z_2 x Z'_2)
orbifold constructions in 5 dimensions, Standard Model (SM) matter and Higgs
fields can be realized in terms of 5d hypermultiplets. These hypermultiplets
can naturally have large bulk masses, leading to a localization of the zero
modes at one of the two branes or to an exponential suppression of the mass of
the lowest-lying non-zero mode. We demonstrate that these dynamical features
allow for the construction of an elegant 3-generation SU(5) model in 5
dimensions that explains all the hierarchies between fermion masses and CKM
matrix elements in geometrical terms. Moreover, if U(1)_\chi (where SU(5) x
U(1)_\chi \subset SO(10)) is gauged in the bulk, but broken by the orbifold
action at the SM brane, the right-handed neutrino mass scale is naturally
suppressed relative to M_GUT. Together with our construction in the charged
fermion sector this leads, via the usual see-saw mechanism, to a realistic
light neutrino mass scale and large neutrino mixing angles.
| [
{
"created": "Tue, 14 May 2002 16:27:03 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jul 2002 12:45:32 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Hebecker",
"Arthur",
""
],
[
"March-Russell",
"John",
""
]
] | In supersymmetric grand unified theories (GUTs) based on S^1/(Z_2 x Z'_2) orbifold constructions in 5 dimensions, Standard Model (SM) matter and Higgs fields can be realized in terms of 5d hypermultiplets. These hypermultiplets can naturally have large bulk masses, leading to a localization of the zero modes at one of the two branes or to an exponential suppression of the mass of the lowest-lying non-zero mode. We demonstrate that these dynamical features allow for the construction of an elegant 3-generation SU(5) model in 5 dimensions that explains all the hierarchies between fermion masses and CKM matrix elements in geometrical terms. Moreover, if U(1)_\chi (where SU(5) x U(1)_\chi \subset SO(10)) is gauged in the bulk, but broken by the orbifold action at the SM brane, the right-handed neutrino mass scale is naturally suppressed relative to M_GUT. Together with our construction in the charged fermion sector this leads, via the usual see-saw mechanism, to a realistic light neutrino mass scale and large neutrino mixing angles. |
hep-ph/0411371 | Jean-Rene Cudell | O.V. Selyugin, J.R. Cudell and E. Predazzi | Large-distance effects on spin observables at RHIC | LaTeX, 5 pages, 3 figures, presented by O.V.S. at the 16th
International Spin Physics Symposium, spin2004, October 10-16 2004, Trieste,
Italy. Fig. 3 corrected in version 2 | null | 10.1142/9789812701909_0105 | null | hep-ph | null | The impact of large-distance contributions on the behaviour of the slopes of
the spin-non-flip and of the spin-flip amplitudes is analysed. It is shown that
the long tail of the hadron potential in impact parameter space leads to a
larger value of the slope for the spin-flip amplitude (without the kinematic
factor sqrt(|t|)) than for the spin-non-flip amplitude. This effect is taken
into account in the calculation of the analysing power in proton-nucleus
reactions at high energies.
| [
{
"created": "Mon, 29 Nov 2004 14:04:58 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2004 13:48:07 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Selyugin",
"O. V.",
""
],
[
"Cudell",
"J. R.",
""
],
[
"Predazzi",
"E.",
""
]
] | The impact of large-distance contributions on the behaviour of the slopes of the spin-non-flip and of the spin-flip amplitudes is analysed. It is shown that the long tail of the hadron potential in impact parameter space leads to a larger value of the slope for the spin-flip amplitude (without the kinematic factor sqrt(|t|)) than for the spin-non-flip amplitude. This effect is taken into account in the calculation of the analysing power in proton-nucleus reactions at high energies. |
1312.0874 | Bennie F. L. Ward | B.F.L. Ward (1), S.K. Majhi (2), A. Mukhopadhyay (1), S.A. Yost (3)
((1) Baylor Univesity, Waco, TX, USA, (2) Indian Association for the
Cultivation of Science, Kolkata, IN, (3) The Citadel, Charleston, SC, USA) | Comparisons of Predictions from Exact Amplitude-Based Resummation
Methods with LHC and Cosmological Data | 9 pages, 2 figures; presented by B.F.L. Ward at RADCOR 2013, Durham,
UK | null | null | BU-HEPP-13-04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the current status of the comparisons with the respective data of
the predictions of our approach of exact amplitude-based resummation in quantum
field theory in two areas of investigation: precision QCD calculations of all
four of us as needed for LHC physics and the resummed quantum gravity
realization by one of us (B.F.L.W.) of Einstein's theory of general relativity
as formulated by Feynman. The agreement between the theoretical predictions and
the data exhibited continues to be encouraging.
| [
{
"created": "Tue, 3 Dec 2013 16:18:02 GMT",
"version": "v1"
}
] | 2013-12-04 | [
[
"Ward",
"B. F. L.",
""
],
[
"Majhi",
"S. K.",
""
],
[
"Mukhopadhyay",
"A.",
""
],
[
"Yost",
"S. A.",
""
]
] | We present the current status of the comparisons with the respective data of the predictions of our approach of exact amplitude-based resummation in quantum field theory in two areas of investigation: precision QCD calculations of all four of us as needed for LHC physics and the resummed quantum gravity realization by one of us (B.F.L.W.) of Einstein's theory of general relativity as formulated by Feynman. The agreement between the theoretical predictions and the data exhibited continues to be encouraging. |
1411.7686 | Pratishruti Saha | Pratishruti Saha | Search for New Physics in Rare Top Decays | Contribution to TOP 2014 - the 7th International Workshop on Top
Quark Physics | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Top physics provides a fertile ground for new-physics searches. At present,
most top observables appear to be in good agreement with the respective
Standard Model predictions. However, in the case of decay modes that are
suppressed in the Standard Model, new-physics contributions of comparable
magnitude may exist and yet go unnoticed because their impact on the total
decay width is small. Hence it is interesting to probe rare top decays. This
analysis focuses on the decay $t \to b \bar b c$. Useful observables are
identified and prospects for measuring new-physics parameters are examined.
| [
{
"created": "Thu, 27 Nov 2014 19:30:14 GMT",
"version": "v1"
}
] | 2014-12-01 | [
[
"Saha",
"Pratishruti",
""
]
] | Top physics provides a fertile ground for new-physics searches. At present, most top observables appear to be in good agreement with the respective Standard Model predictions. However, in the case of decay modes that are suppressed in the Standard Model, new-physics contributions of comparable magnitude may exist and yet go unnoticed because their impact on the total decay width is small. Hence it is interesting to probe rare top decays. This analysis focuses on the decay $t \to b \bar b c$. Useful observables are identified and prospects for measuring new-physics parameters are examined. |
hep-ph/9402210 | Chris Quigg | Estia J. Eichten and Chris Quigg | Mesons with Beauty and Charm: Spectroscopy | 32 pages + 2 uuencoded PostScript figures Fermilab-Pub-94/032-T | Phys.Rev.D49:5845-5856,1994 | 10.1103/PhysRevD.49.5845 | null | hep-ph | null | Applying knowledge of the interaction between heavy quarks derived from the
study of $c\overline{c}$ and $b\overline{b}$ bound states, we calculate the
spectrum of $c\overline{b}$ mesons. We compute transition rates for the
electromagnetic and hadronic cascades that lead from excited states to the
$^1\text{S}_0$ ground state, and briefly consider the prospects for
experimental observation of the spectrum.
| [
{
"created": "Wed, 2 Feb 1994 21:08:39 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Eichten",
"Estia J.",
""
],
[
"Quigg",
"Chris",
""
]
] | Applying knowledge of the interaction between heavy quarks derived from the study of $c\overline{c}$ and $b\overline{b}$ bound states, we calculate the spectrum of $c\overline{b}$ mesons. We compute transition rates for the electromagnetic and hadronic cascades that lead from excited states to the $^1\text{S}_0$ ground state, and briefly consider the prospects for experimental observation of the spectrum. |
1409.6347 | Sener Ozonder | Sener Ozonder | Triple- and Quadruple-Gluon Azimuthal Correlations from Glasma and
Higher-Dimensional Ridges | Only the published version includes the latest changes (more
explanations and references) | Phys. Rev. D 91, 034005 (2015) | 10.1103/PhysRevD.91.034005 | INT-PUB-14-022 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the triple- and quadruple-gluon inclusive distributions with
arbitrary rapidity and azimuthal angle dependences in the gluon saturation
regime by using glasma diagrams. Also, we predict higher-dimensional ridges in
triple- and quadruple-hadron correlations for p-p and p-Pb collisions at LHC,
which have yet to be measured. In p-p and p-Pb collisions at the top LHC
energies, gluon saturation is expected to occur since smaller Bjorken-$x$
values are being probed. Glasma diagrams, which are enhanced at small-$x$,
include the gluon saturation effects, and they are used for calculating the
long-range rapidity correlations ("ridges") and $v_n$ moments of the azimuthal
distribution of detected hadrons. The glasma description reproduces the
systematics of the data on both p-p and p-Pb ridges. As an alternative,
relativistic hydrodynamics has also been applied to these small systems quite
successfully. With the triple- and quadruple-gluon azimuthal correlations, this
work aims to set the stage by going beyond the double-gluon azimuthal
correlations in order to settle unambiguously the origin of "collectivity" in
p-p and p-Pb collisions. We derive the triple- and quadruple-gluon azimuthal
correlation functions in terms of unintegrated gluon distributions at arbitrary
rapidities and azimuthal angles of the produced gluons. Then, unintegrated
gluon distributions from the running coupling Balitsky-Kovchegov evolution
equation are used to calculate the triple- and quadruple-gluon correlations for
various parameters of gluon momenta, initial scale for small-$x$ evolution and
beam energy.
| [
{
"created": "Mon, 22 Sep 2014 21:34:17 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Feb 2015 02:24:24 GMT",
"version": "v2"
}
] | 2015-02-12 | [
[
"Ozonder",
"Sener",
""
]
] | We calculate the triple- and quadruple-gluon inclusive distributions with arbitrary rapidity and azimuthal angle dependences in the gluon saturation regime by using glasma diagrams. Also, we predict higher-dimensional ridges in triple- and quadruple-hadron correlations for p-p and p-Pb collisions at LHC, which have yet to be measured. In p-p and p-Pb collisions at the top LHC energies, gluon saturation is expected to occur since smaller Bjorken-$x$ values are being probed. Glasma diagrams, which are enhanced at small-$x$, include the gluon saturation effects, and they are used for calculating the long-range rapidity correlations ("ridges") and $v_n$ moments of the azimuthal distribution of detected hadrons. The glasma description reproduces the systematics of the data on both p-p and p-Pb ridges. As an alternative, relativistic hydrodynamics has also been applied to these small systems quite successfully. With the triple- and quadruple-gluon azimuthal correlations, this work aims to set the stage by going beyond the double-gluon azimuthal correlations in order to settle unambiguously the origin of "collectivity" in p-p and p-Pb collisions. We derive the triple- and quadruple-gluon azimuthal correlation functions in terms of unintegrated gluon distributions at arbitrary rapidities and azimuthal angles of the produced gluons. Then, unintegrated gluon distributions from the running coupling Balitsky-Kovchegov evolution equation are used to calculate the triple- and quadruple-gluon correlations for various parameters of gluon momenta, initial scale for small-$x$ evolution and beam energy. |
hep-ph/0209207 | Martti Raidal | A. Dedes, J. Ellis and M. Raidal | Higgs-Mediated $B_{s,d}^0\to\mu\tau, e\tau$ and $\tau\to3\mu, e\mu\mu$
Decays in Supersymmetric Seesaw Models | 13 pages, 8 postscript figures | Phys.Lett.B549:159-169,2002 | 10.1016/S0370-2693(02)02900-3 | CERN-TH/2002-239 | hep-ph | null | We study the rates allowed for the Higgs-mediated decays
$B_{s,d}^0\to\mu\tau, e\tau$ and $\tau\to \mu\mu\mu, e\mu\mu$ in supersymmetric
seesaw models, assuming that the only source of lepton flavour violation (LFV)
is the renormalization of soft supersymmetry-breaking terms due to off-diagonal
singlet-neutrino Yukawa interactions. These decays are strongly correlated
with, and constrained by, the branching ratios for $B_{s,d}^0\to\mu\mu$ and
$\tau\to \mu(e)\gamma.$ Parametrizing the singlet-neutrino Yukawa couplings
$Y_\nu$ and masses $M_{N_i}$ in terms of low-energy neutrino data, and allowing
the flavour-universal soft masses for sleptons and for squarks, as well as
those for the two Higgs doublets, to be different at the unification scale, we
scan systematically over the model parameter space. Neutrino data and the
present experimental constraints set upper limits on the Higgs-mediated LFV
decay rates $Br(B_{s}^0\to\mu\tau, e\tau)\lsim 4\times 10^{-9}$ and
$Br(\tau\to\mu\mu\mu, e\mu\mu)\lsim 4\times 10^{-10}$.
| [
{
"created": "Wed, 18 Sep 2002 16:31:20 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Dedes",
"A.",
""
],
[
"Ellis",
"J.",
""
],
[
"Raidal",
"M.",
""
]
] | We study the rates allowed for the Higgs-mediated decays $B_{s,d}^0\to\mu\tau, e\tau$ and $\tau\to \mu\mu\mu, e\mu\mu$ in supersymmetric seesaw models, assuming that the only source of lepton flavour violation (LFV) is the renormalization of soft supersymmetry-breaking terms due to off-diagonal singlet-neutrino Yukawa interactions. These decays are strongly correlated with, and constrained by, the branching ratios for $B_{s,d}^0\to\mu\mu$ and $\tau\to \mu(e)\gamma.$ Parametrizing the singlet-neutrino Yukawa couplings $Y_\nu$ and masses $M_{N_i}$ in terms of low-energy neutrino data, and allowing the flavour-universal soft masses for sleptons and for squarks, as well as those for the two Higgs doublets, to be different at the unification scale, we scan systematically over the model parameter space. Neutrino data and the present experimental constraints set upper limits on the Higgs-mediated LFV decay rates $Br(B_{s}^0\to\mu\tau, e\tau)\lsim 4\times 10^{-9}$ and $Br(\tau\to\mu\mu\mu, e\mu\mu)\lsim 4\times 10^{-10}$. |
1001.5456 | Roberto Barcelo | Roberto Barcelo, Manuel Masip | Extra Higgs bosons in ttbar production at the LHC | 18 pages, version to appear in PRD | Phys.Rev.D81:075019,2010 | 10.1103/PhysRevD.81.075019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The top quark has a large Yukawa coupling with the Higgs boson. In the usual
extensions of the standard model the Higgs sector includes extra scalars, which
also tend to couple strongly with the top quark. Unlike the Higgs, these fields
have a natural mass above 2m_t, so they could introduce anomalies in ttbar
production at the LHC. We study their effect on the ttbar invariant mass
distribution at sqrt{s}=7 TeV. We focus on the bosons (H,A) of the minimal SUSY
model and on the scalar field (r) associated to the new scale f in Little Higgs
(LH) models. We show that in all cases the interference with the standard
amplitude dominates over the narrow-width contribution. As a consequence, the
mass difference between H and A or the contribution of an extra T-quark loop in
LH models become important effects in order to determine if these fields are
observable there. We find that a 1 fb^{-1} luminosity could probe the region
tan beta \le 3 of SUSY and v/(sqrt{2}f) \ge 0.3 in LH models.
| [
{
"created": "Fri, 29 Jan 2010 19:19:39 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Feb 2010 16:30:27 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Feb 2010 14:31:21 GMT",
"version": "v3"
},
{
"created": "Tue, 6 Apr 2010 10:39:14 GMT",
"version": "v4"
}
] | 2015-03-13 | [
[
"Barcelo",
"Roberto",
""
],
[
"Masip",
"Manuel",
""
]
] | The top quark has a large Yukawa coupling with the Higgs boson. In the usual extensions of the standard model the Higgs sector includes extra scalars, which also tend to couple strongly with the top quark. Unlike the Higgs, these fields have a natural mass above 2m_t, so they could introduce anomalies in ttbar production at the LHC. We study their effect on the ttbar invariant mass distribution at sqrt{s}=7 TeV. We focus on the bosons (H,A) of the minimal SUSY model and on the scalar field (r) associated to the new scale f in Little Higgs (LH) models. We show that in all cases the interference with the standard amplitude dominates over the narrow-width contribution. As a consequence, the mass difference between H and A or the contribution of an extra T-quark loop in LH models become important effects in order to determine if these fields are observable there. We find that a 1 fb^{-1} luminosity could probe the region tan beta \le 3 of SUSY and v/(sqrt{2}f) \ge 0.3 in LH models. |
1811.12394 | Nikolay Volchanskiy | N. Volchanskiy, V. Beylin, V. Kuksa | Models of hypercolor based on symplectic gauge group with three heavy
vectorlike hyperquarks | 15 pages | Int. J. Mod. Phys. D, ID 1941002 (2019) | 10.1142/S0218271819410025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study possibilities to extend the Standard Model (SM) by three flavors of
vectorlike heavy quarks in pseudoreal representation of symplectic hypercolor
gauge group. This extension of SM predicts a rich spectra of heavy composite
hypermesons and hyperbaryons (all of them carry integer spins) including
fourteen pseudo-Nambu--Goldstone states emerging in dynamical breaking of the
global symmetry group of the H-quarks, SU(6), to its Sp(6) subgroup. The
properties of the lightest states depend strongly on the choice of heavy-quark
hypercharges. Our focus is placed on the variants of the model with partially
composite Higgs boson, i.e. the experimentally observed boson is comprised of
the elementary SM Higgs and a mixture of H-hadrons.
| [
{
"created": "Thu, 29 Nov 2018 18:57:36 GMT",
"version": "v1"
}
] | 2019-02-01 | [
[
"Volchanskiy",
"N.",
""
],
[
"Beylin",
"V.",
""
],
[
"Kuksa",
"V.",
""
]
] | We study possibilities to extend the Standard Model (SM) by three flavors of vectorlike heavy quarks in pseudoreal representation of symplectic hypercolor gauge group. This extension of SM predicts a rich spectra of heavy composite hypermesons and hyperbaryons (all of them carry integer spins) including fourteen pseudo-Nambu--Goldstone states emerging in dynamical breaking of the global symmetry group of the H-quarks, SU(6), to its Sp(6) subgroup. The properties of the lightest states depend strongly on the choice of heavy-quark hypercharges. Our focus is placed on the variants of the model with partially composite Higgs boson, i.e. the experimentally observed boson is comprised of the elementary SM Higgs and a mixture of H-hadrons. |
hep-ph/9609346 | D. Delepine | D. Delepine | Electroweak baryogenesis and the Minimal Supersymmetric Standard Model | 8 pages with 1 figure(eps) | NATO Adv.Study Inst.Ser.B Phys.363:293-299,1997 | null | UCL-IPT-96-12 | hep-ph | null | In principle, the baryon asymmetry of the Universe can be generated at the
electroweak phase transition but the experimental lower limit on the Higgs mass
seems to rule out a Standard Model scenario. However, it has been shown
recently that in the Minimal Supersymmetric Standard Model, the electroweak
phase transition can be a strong enough first order one for baryogenesis if the
mass of one top squark is close to or smaller than the top mass.
| [
{
"created": "Fri, 13 Sep 1996 11:13:39 GMT",
"version": "v1"
}
] | 2009-02-16 | [
[
"Delepine",
"D.",
""
]
] | In principle, the baryon asymmetry of the Universe can be generated at the electroweak phase transition but the experimental lower limit on the Higgs mass seems to rule out a Standard Model scenario. However, it has been shown recently that in the Minimal Supersymmetric Standard Model, the electroweak phase transition can be a strong enough first order one for baryogenesis if the mass of one top squark is close to or smaller than the top mass. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.