id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0412070 | Yoshinori Cho | Yoshinori Cho, Kiyoshi Shiraishi | Finite density effects in Hosotani mechanism and a vacuum gauge ball | 20 pages, 7 figures. RevTeX4 | null | null | null | hep-ph astro-ph hep-th | null | We consider the finite density effects of the fermion with U(1) gauge
symmetry in Hosotani mechanism. We construct a vacuum gauge ball, a new kind of
non-topological soliton, and investigate their properties numerically. We find
the relations between the physical quantities.
| [
{
"created": "Mon, 6 Dec 2004 04:11:11 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Dec 2004 03:41:45 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cho",
"Yoshinori",
""
],
[
"Shiraishi",
"Kiyoshi",
""
]
] | We consider the finite density effects of the fermion with U(1) gauge symmetry in Hosotani mechanism. We construct a vacuum gauge ball, a new kind of non-topological soliton, and investigate their properties numerically. We find the relations between the physical quantities. |
1306.6089 | Peter Graham | Dmitry Budker, Peter W. Graham, Micah Ledbetter, Surjeet Rajendran,
Alex Sushkov | Cosmic Axion Spin Precession Experiment (CASPEr) | 11 pages, 2 figures, 1 table. v2: Reordered sections and minor
modifications to agree with published version | Phys. Rev. X 4, 021030 (2014) | 10.1103/PhysRevX.4.021030 | null | hep-ph astro-ph.CO cond-mat.other hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an experiment to search for QCD axion and axion-like-particle
(ALP) dark matter. Nuclei that are interacting with the background axion dark
matter acquire time-varying CP-odd nuclear moments such as an electric dipole
moment. In analogy with nuclear magnetic resonance, these moments cause
precession of nuclear spins in a material sample in the presence of an electric
field. Precision magnetometry can be used to search for such precession. An
initial phase of this experiment could cover many orders of magnitude in ALP
parameter space beyond the current astrophysical and laboratory limits. And
with established techniques, the proposed experimental scheme has sensitivity
to QCD axion masses m_a < 10^-9 eV, corresponding to theoretically
well-motivated axion decay constants f_a > 10^16 GeV. With further
improvements, this experiment could ultimately cover the entire range of masses
m_a < 10^-6 eV, complementary to cavity searches.
| [
{
"created": "Tue, 25 Jun 2013 21:06:15 GMT",
"version": "v1"
},
{
"created": "Thu, 29 May 2014 17:00:31 GMT",
"version": "v2"
}
] | 2014-05-30 | [
[
"Budker",
"Dmitry",
""
],
[
"Graham",
"Peter W.",
""
],
[
"Ledbetter",
"Micah",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Sushkov",
"Alex",
""
]
] | We propose an experiment to search for QCD axion and axion-like-particle (ALP) dark matter. Nuclei that are interacting with the background axion dark matter acquire time-varying CP-odd nuclear moments such as an electric dipole moment. In analogy with nuclear magnetic resonance, these moments cause precession of nuclear spins in a material sample in the presence of an electric field. Precision magnetometry can be used to search for such precession. An initial phase of this experiment could cover many orders of magnitude in ALP parameter space beyond the current astrophysical and laboratory limits. And with established techniques, the proposed experimental scheme has sensitivity to QCD axion masses m_a < 10^-9 eV, corresponding to theoretically well-motivated axion decay constants f_a > 10^16 GeV. With further improvements, this experiment could ultimately cover the entire range of masses m_a < 10^-6 eV, complementary to cavity searches. |
2311.00043 | Sean Tulin | Safa Ben Othman, Armita Jalooli, Sean Tulin | Baryonic dark forces in electron-beam fixed-target experiments | 28 pages, 12 figures; minor revisions, matches published version | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | New GeV-scale dark forces coupling predominantly to quarks offer novel
signatures that can be produced directly and searched for at high-luminosity
colliders. We compute the photon-proton and electron-proton cross sections for
producing a GeV-scale gauge boson arising from a $U(1)_B$ gauge symmetry. Our
calculation relies on vector meson dominance and a phenomenological model for
diffractive scattering used for vector-meson photoproduction. The parameters of
our phenomenological model are fixed by performing a Markov Chain Monte Carlo
fit to existing exclusive photoproduction data for $\omega$ and $\phi$ mesons.
Our approach can be generalized to other GeV-scale dark gauge forces.
| [
{
"created": "Tue, 31 Oct 2023 18:00:10 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jan 2024 21:37:09 GMT",
"version": "v2"
}
] | 2024-01-23 | [
[
"Othman",
"Safa Ben",
""
],
[
"Jalooli",
"Armita",
""
],
[
"Tulin",
"Sean",
""
]
] | New GeV-scale dark forces coupling predominantly to quarks offer novel signatures that can be produced directly and searched for at high-luminosity colliders. We compute the photon-proton and electron-proton cross sections for producing a GeV-scale gauge boson arising from a $U(1)_B$ gauge symmetry. Our calculation relies on vector meson dominance and a phenomenological model for diffractive scattering used for vector-meson photoproduction. The parameters of our phenomenological model are fixed by performing a Markov Chain Monte Carlo fit to existing exclusive photoproduction data for $\omega$ and $\phi$ mesons. Our approach can be generalized to other GeV-scale dark gauge forces. |
hep-ph/9906433 | K. Matsuda | K. Matsuda, H. Nishiura and T. Fukuyama | SO(10) GUT and Quark-Lepton Mass Matrices | 32pp, REV TeX, 12 EPS Figures | Phys.Rev. D61 (2000) 053001 | 10.1103/PhysRevD.61.053001 | null | hep-ph | null | The phenomenological model that all quark and lepton mass matrices have the
same zero texture, namely their (1,1), (1,3) and (3,1) components are zeros, is
discussed in the context of SO(10) Grand Unified Theories (GUTs). The mass
matrices of type I for quarks are consistent with the experimental data in the
quark sector. For the lepton sector, consistent fitting to the data of neutrino
oscillation experiments force us to use the mass matrix for the charged leptons
which is slightly deviated from type I. Given quark masses and charged lepton
masses, the model includes 19 free parameters, whereas the SO(10) GUTs gives 16
constrained equations. Changing the remaining three parameters freely, we can
fit all the entries of the CKM quark mixing matrix and the MNS lepton mixing
matrix, and three neutrino masses consistently with the present experimental
data.
| [
{
"created": "Sat, 19 Jun 1999 11:41:31 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Oct 1999 07:16:17 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Matsuda",
"K.",
""
],
[
"Nishiura",
"H.",
""
],
[
"Fukuyama",
"T.",
""
]
] | The phenomenological model that all quark and lepton mass matrices have the same zero texture, namely their (1,1), (1,3) and (3,1) components are zeros, is discussed in the context of SO(10) Grand Unified Theories (GUTs). The mass matrices of type I for quarks are consistent with the experimental data in the quark sector. For the lepton sector, consistent fitting to the data of neutrino oscillation experiments force us to use the mass matrix for the charged leptons which is slightly deviated from type I. Given quark masses and charged lepton masses, the model includes 19 free parameters, whereas the SO(10) GUTs gives 16 constrained equations. Changing the remaining three parameters freely, we can fit all the entries of the CKM quark mixing matrix and the MNS lepton mixing matrix, and three neutrino masses consistently with the present experimental data. |
0812.2397 | Miguel Sanchis | Miguel-Angel Sanchis-Lozano | Prospects of searching for (un)particles from Hidden Sectors using
rapidity correlations in multiparticle production at the LHC | 36 pages, 6 figures. New references and a new section on Glasma
physics have been added | Int.J.Mod.Phys.A24:4529-4572,2009 | 10.1142/S0217751X09045820 | IFIC/08-61, FTUV-08-1212 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most signatures of new physics have been studied on the transverse plane with
respect to the beam direction at the LHC where background is much reduced. In
this paper we propose the analysis of inclusive longitudinal (pseudo)rapidity
correlations among final-state (charged) particles in order to search for
(un)particles belonging to a Hidden Sector beyond the Standard Model, using a
selected sample of p-p minimum bias events (applying appropriate off-line cuts
on events based on, e.g., minijets, high-multiplicity, event shape variables,
high-pT leptons and photons, etc) collected at the early running of the LHC. To
this aim, we examine inclusive and semi-inclusive two-particle correlation
functions, forward-backward correlations, and factorial moments of the
multiplicity distribution, without resorting to any particular model but under
very general (though simplifying) assumptions. Finally, motivated by some
analysis techniques employed in the search for Quark-Gluon-Plasma in heavy-ion
collisions, we investigate the impact of such intermediate (un)particle stuff
on the (multi)fractality of parton cascades in p-p collisions, by means of a
Levy stable law description and a Ginzburg-Landau model of phase transitions.
Results from our preliminary study seem encouraging for possible dedicated
analyses at the LHC and Tevatron experiments.
| [
{
"created": "Fri, 12 Dec 2008 18:24:43 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Dec 2008 17:15:58 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Jan 2009 17:13:09 GMT",
"version": "v3"
}
] | 2010-04-30 | [
[
"Sanchis-Lozano",
"Miguel-Angel",
""
]
] | Most signatures of new physics have been studied on the transverse plane with respect to the beam direction at the LHC where background is much reduced. In this paper we propose the analysis of inclusive longitudinal (pseudo)rapidity correlations among final-state (charged) particles in order to search for (un)particles belonging to a Hidden Sector beyond the Standard Model, using a selected sample of p-p minimum bias events (applying appropriate off-line cuts on events based on, e.g., minijets, high-multiplicity, event shape variables, high-pT leptons and photons, etc) collected at the early running of the LHC. To this aim, we examine inclusive and semi-inclusive two-particle correlation functions, forward-backward correlations, and factorial moments of the multiplicity distribution, without resorting to any particular model but under very general (though simplifying) assumptions. Finally, motivated by some analysis techniques employed in the search for Quark-Gluon-Plasma in heavy-ion collisions, we investigate the impact of such intermediate (un)particle stuff on the (multi)fractality of parton cascades in p-p collisions, by means of a Levy stable law description and a Ginzburg-Landau model of phase transitions. Results from our preliminary study seem encouraging for possible dedicated analyses at the LHC and Tevatron experiments. |
1607.01409 | A. Tureanu | Kazuo Fujikawa and Anca Tureanu | Lorentz invariant CPT breaking in the Dirac equation | Talk given at the Memorial Meeting for Abdus Salam's 90th Birthday,
Nanyang Technological University, Singapore, January 25-28, 2016 (to appear
in the Proceedings) | null | 10.1142/S0217751X17410147 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If one modifies the Dirac equation in momentum space to
$[\gamma^{\mu}p_{\mu}-m-\Delta m(\theta(p_{0})-\theta(-p_{0}))
\theta(p_{\mu}^{2})]\psi(p)=0$, the symmetry of positive and negative energy
eigenvalues is lifted by $m\pm \Delta m$ for a small $\Delta m$. The mass
degeneracy of the particle and antiparticle is thus lifted in a Lorentz
invariant manner since the combinations $\theta(\pm p_{0})\theta(p_{\mu}^{2})$
with step functions are manifestly Lorentz invariant. We explain an explicit
construction of this CPT breaking term in coordinate space, which is Lorentz
invariant but non-local at a distance scale of the Planck length. The
application of this Lorentz invariant CPT breaking mechanism to the possible
mass splitting of the neutrino and antineutrino in the Standard Model is
briefly discussed.
| [
{
"created": "Tue, 5 Jul 2016 20:35:32 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Fujikawa",
"Kazuo",
""
],
[
"Tureanu",
"Anca",
""
]
] | If one modifies the Dirac equation in momentum space to $[\gamma^{\mu}p_{\mu}-m-\Delta m(\theta(p_{0})-\theta(-p_{0})) \theta(p_{\mu}^{2})]\psi(p)=0$, the symmetry of positive and negative energy eigenvalues is lifted by $m\pm \Delta m$ for a small $\Delta m$. The mass degeneracy of the particle and antiparticle is thus lifted in a Lorentz invariant manner since the combinations $\theta(\pm p_{0})\theta(p_{\mu}^{2})$ with step functions are manifestly Lorentz invariant. We explain an explicit construction of this CPT breaking term in coordinate space, which is Lorentz invariant but non-local at a distance scale of the Planck length. The application of this Lorentz invariant CPT breaking mechanism to the possible mass splitting of the neutrino and antineutrino in the Standard Model is briefly discussed. |
2310.05749 | Renan Pereira | Renan C\^amara Pereira, Jo\~ao Moreira, Pedro Costa and Constan\c{c}a
Provid\^encia | A new approach to the 3-momentum regularization of the in-medium one and
two fermion line integrals with applications to cross sections in the
Nambu--Jona-Lasinio model | 65 pages, 25 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We propose the 3-momentum sphere intersection regularization applied to the
one and two fermion line integrals at finite temperature and chemical
potential. The quark-antiquark polarization function in this new regularization
approach is equivalent to the usual 3-momentum regularization, when the
absolute value of the external 3-momentum of the polarization is zero.
Additionally, it respects the particle-antiparticle symmetry of meson states in
the Nambu$-$Jona-Lasinio (NJL) model for all values of temperature and chemical
potential. Without this symmetry, in-medium cross sections calculated in the
3-momentum regularized NJL model are not consistent. In order to demonstrate
the difference between the usual 3-momentum regularization with the one
proposed in this work, we study the quark-quark and quark-antiquark cross
sections in both regularization schemes. To this end we use the standard
$SU(3)$ NJL model, with four and six quark interactions. We observe major
quantitative and qualitative differences when comparing quark-quark cross
sections in both schemes. The quark-antiquark cross sections, on the other
hand, are very similar in both regularizations, owning to the equivalence
between the regularizations when the absolute value of the external 3-momentum
is zero.
| [
{
"created": "Mon, 9 Oct 2023 14:23:47 GMT",
"version": "v1"
}
] | 2023-10-10 | [
[
"Pereira",
"Renan Câmara",
""
],
[
"Moreira",
"João",
""
],
[
"Costa",
"Pedro",
""
],
[
"Providência",
"Constança",
""
]
] | We propose the 3-momentum sphere intersection regularization applied to the one and two fermion line integrals at finite temperature and chemical potential. The quark-antiquark polarization function in this new regularization approach is equivalent to the usual 3-momentum regularization, when the absolute value of the external 3-momentum of the polarization is zero. Additionally, it respects the particle-antiparticle symmetry of meson states in the Nambu$-$Jona-Lasinio (NJL) model for all values of temperature and chemical potential. Without this symmetry, in-medium cross sections calculated in the 3-momentum regularized NJL model are not consistent. In order to demonstrate the difference between the usual 3-momentum regularization with the one proposed in this work, we study the quark-quark and quark-antiquark cross sections in both regularization schemes. To this end we use the standard $SU(3)$ NJL model, with four and six quark interactions. We observe major quantitative and qualitative differences when comparing quark-quark cross sections in both schemes. The quark-antiquark cross sections, on the other hand, are very similar in both regularizations, owning to the equivalence between the regularizations when the absolute value of the external 3-momentum is zero. |
1210.0594 | Gautam Bhattacharyya | Gautam Bhattacharyya and Tirtha Sankar Ray | Pushing the SUSY Higgs mass towards 125 GeV with a color adjoint | v2: 6 pages, 4 figures, estimate of fine-tuning and some more
clarifying remarks added, published in PRD | Phys. Rev. D 87, 015017 (2013) | 10.1103/PhysRevD.87.015017 | SINP/TNP/2012/13, DO-TH 12/29 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that inclusion of a TeV scale chiral superfield transforming in the
adjoint representation of the color SU(3) to the MSSM particle content modifies
the renormalization group running of some parameters in such a way that a 125
GeV mass of the light Higgs boson is accommodated more comfortably than in
cMSSM / mSUGRA. Put differently, the introduction of a color adjoint TeV scale
superfield helps resurrecting lighter choices for the stop and gluino which are
otherwise disfavored in cMSSM / mSUGRA.
| [
{
"created": "Mon, 1 Oct 2012 22:05:02 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2013 08:39:01 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Bhattacharyya",
"Gautam",
""
],
[
"Ray",
"Tirtha Sankar",
""
]
] | We show that inclusion of a TeV scale chiral superfield transforming in the adjoint representation of the color SU(3) to the MSSM particle content modifies the renormalization group running of some parameters in such a way that a 125 GeV mass of the light Higgs boson is accommodated more comfortably than in cMSSM / mSUGRA. Put differently, the introduction of a color adjoint TeV scale superfield helps resurrecting lighter choices for the stop and gluino which are otherwise disfavored in cMSSM / mSUGRA. |
1410.5673 | Leonard Lesniak | Leonard Lesniak, Jean-Pierre Dedonder, Robert Kaminski and Benoit
Loiseau | Dalitz plot analysis of D0 --> K0S pi+ pi- decays in a factorization
approach | 4 pages, 5 figures, contribution to the 13th International Workshop
on Meson Production, Properties and Interaction, Krakow, Poland, 29th May -
3rd June 2014 | null | 10.1051/epjconf/20148105019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quasi two-body QCD factorization is used to study the D0 --> K0S pi+ pi
decays. The presently available high-statistics Dalitz plot data of this
process measured by the Belle and BABAR Collaborations are analyzed together
with the tau- --> K0S pi- nu_tau decay data. The total experimental branching
fraction is also included in the fits which show a very good overall agreement
with the experimental Dalitz plot density distributions. The branching
fractions of the dominant channels compare well with those of the isobar Belle
or BABAR models. We show that the branching fractions corresponding to the
annihilation amplitudes are significant.
| [
{
"created": "Tue, 21 Oct 2014 14:15:42 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Lesniak",
"Leonard",
""
],
[
"Dedonder",
"Jean-Pierre",
""
],
[
"Kaminski",
"Robert",
""
],
[
"Loiseau",
"Benoit",
""
]
] | A quasi two-body QCD factorization is used to study the D0 --> K0S pi+ pi decays. The presently available high-statistics Dalitz plot data of this process measured by the Belle and BABAR Collaborations are analyzed together with the tau- --> K0S pi- nu_tau decay data. The total experimental branching fraction is also included in the fits which show a very good overall agreement with the experimental Dalitz plot density distributions. The branching fractions of the dominant channels compare well with those of the isobar Belle or BABAR models. We show that the branching fractions corresponding to the annihilation amplitudes are significant. |
1409.5775 | Yasuhiro Yamamoto | Yasuhiro Yamamoto | Unitarity bounds on scalar dark matter effective interactions at LHC | 8 pages, 6 figures; v2:published version | Prog. Theor. Exp. Phys. (2014) 123B03 | 10.1093/ptep/ptu169 | UG-FT-312/14,CAFPE-182/14 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the compatibility of the unitarity bound and the 8TeV LHC on the
effective theory of the scalar dark matter. In several signals of effective
interactions, mono-jet with missing energy events are studied. We found that,
at least, if the dark matter mass is about 800GeV or heavier, contributions of
events violating the unitarity are not negligible. The unitarity conditions in
the 14TeV LHC are also calculated.
| [
{
"created": "Fri, 19 Sep 2014 19:30:03 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jan 2015 17:04:22 GMT",
"version": "v2"
}
] | 2015-01-27 | [
[
"Yamamoto",
"Yasuhiro",
""
]
] | We study the compatibility of the unitarity bound and the 8TeV LHC on the effective theory of the scalar dark matter. In several signals of effective interactions, mono-jet with missing energy events are studied. We found that, at least, if the dark matter mass is about 800GeV or heavier, contributions of events violating the unitarity are not negligible. The unitarity conditions in the 14TeV LHC are also calculated. |
hep-ph/0311193 | Roberto Sghedoni | R.Sghedoni | Resummed Transverse Momentum Distribution in b->s+gamma | Talk given at "XV IFAE: Incontri sulla Fisica delle Alte Energie",
Lecce, Italy, 23-26 April 2003, 4 pages | null | null | UPRF-2003-28 | hep-ph | null | We present the complete calculation of the transverse momentum distribution
for the decay b-> s gamma. The contributions of the leading operator O_7 are
computed: infrared logarithms are resummed with next-to-leading accuracy
according to usual techniques of resummation. Non logarithmic terms are
evaluated to O(alpha_S) by calculating one loop diagrams.
| [
{
"created": "Fri, 14 Nov 2003 14:59:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sghedoni",
"R.",
""
]
] | We present the complete calculation of the transverse momentum distribution for the decay b-> s gamma. The contributions of the leading operator O_7 are computed: infrared logarithms are resummed with next-to-leading accuracy according to usual techniques of resummation. Non logarithmic terms are evaluated to O(alpha_S) by calculating one loop diagrams. |
2004.07423 | Ahmad Jafar Arifi | A. J. Arifi, H. Nagahiro, A. Hosaka, K. Tanida | Roper-like resonances with various flavor contents and their two-pion
emission decays | 4 pages, 5 figures | Phys. Rev. D 101, 111502 (2020) | 10.1103/PhysRevD.101.111502 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the three-body decay of the newly observed bottom baryon
$\Lambda_b^*(6072)$ by LHCb; $\Lambda_b^*(6072) \to \Lambda_b \pi \pi$. Its
mass about 500 MeV above the ground state $\Lambda_b$ and a broad width imply
that the state could be an analogue of the Roper resonance of the nucleon
$N(1440)$. In terms of sequential processes going through $\Sigma_b$ and
$\Sigma_b^*$, we find that the observed invariant mass distribution is
reproduced assuming its spin and parity $J^P = 1/2^+$. We discuss that the
ratio of the two sequential processes and angular correlation of two pions are
useful for the determination of spin and parity. We suggest further studies for
the Roper resonance analogue in various flavor contents, raising an interesting
and important question in baryon spectroscopy.
| [
{
"created": "Thu, 16 Apr 2020 02:26:51 GMT",
"version": "v1"
}
] | 2020-07-01 | [
[
"Arifi",
"A. J.",
""
],
[
"Nagahiro",
"H.",
""
],
[
"Hosaka",
"A.",
""
],
[
"Tanida",
"K.",
""
]
] | We study the three-body decay of the newly observed bottom baryon $\Lambda_b^*(6072)$ by LHCb; $\Lambda_b^*(6072) \to \Lambda_b \pi \pi$. Its mass about 500 MeV above the ground state $\Lambda_b$ and a broad width imply that the state could be an analogue of the Roper resonance of the nucleon $N(1440)$. In terms of sequential processes going through $\Sigma_b$ and $\Sigma_b^*$, we find that the observed invariant mass distribution is reproduced assuming its spin and parity $J^P = 1/2^+$. We discuss that the ratio of the two sequential processes and angular correlation of two pions are useful for the determination of spin and parity. We suggest further studies for the Roper resonance analogue in various flavor contents, raising an interesting and important question in baryon spectroscopy. |
1003.0941 | Clifford Cheung | Clifford Cheung | Axion Protection from Flavor | 16 pages, 2 figures | JHEP 1006:074,2010 | 10.1007/JHEP06(2010)074 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The QCD axion fails to solve the strong CP problem unless all explicit PQ
violating, Planck-suppressed, dimension n<10 operators are forbidden or have
exponentially small coefficients. We show that all theories with a QCD axion
contain an irreducible source of explicit PQ violation which is proportional to
the determinant of the Yukawa interaction matrix of colored fermions.
Generically, this contribution is of low operator dimension and will
drastically destabilize the axion potential, so its suppression is a necessary
condition for solving the strong CP problem. We propose a mechanism whereby the
PQ symmetry is kept exact up to n=12 with the help of the very same flavor
symmetries which generate the hierarchical quark masses and mixings of the SM.
This "axion flavor protection" is straightforwardly realized in theories which
employ radiative fermion mass generation and grand unification. A universal
feature of this construction is that the heavy quark Yukawa couplings are
generated at the PQ breaking scale.
| [
{
"created": "Thu, 4 Mar 2010 00:56:06 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Cheung",
"Clifford",
""
]
] | The QCD axion fails to solve the strong CP problem unless all explicit PQ violating, Planck-suppressed, dimension n<10 operators are forbidden or have exponentially small coefficients. We show that all theories with a QCD axion contain an irreducible source of explicit PQ violation which is proportional to the determinant of the Yukawa interaction matrix of colored fermions. Generically, this contribution is of low operator dimension and will drastically destabilize the axion potential, so its suppression is a necessary condition for solving the strong CP problem. We propose a mechanism whereby the PQ symmetry is kept exact up to n=12 with the help of the very same flavor symmetries which generate the hierarchical quark masses and mixings of the SM. This "axion flavor protection" is straightforwardly realized in theories which employ radiative fermion mass generation and grand unification. A universal feature of this construction is that the heavy quark Yukawa couplings are generated at the PQ breaking scale. |
1301.3990 | Seyda Ipek | Seyda Ipek | Light Axigluon Contributions to b-bbar and c-cbar Asymmetry and
Constraints on Flavor Changing Axigluon Currents | 23 pages, 13 figures | Phys. Rev. D 87, 116010 (2013) | 10.1103/PhysRevD.87.116010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The light axigluon model of Tavares and Schmaltz is a viable candidate to
explain the Tevatron t-tbar forward-backward asymmetry. In this paper we
present the forward-backward asymmetries for b-bbar and c-cbar systems
predicted by the light axigluon. Furthermore, we modify this model to include
flavor changing couplings of axigluons with the SM quarks. We constrain these
couplings from the available neutral meson mixing data, and investigate their
effects on the rare decay B^0_s -> mu^+ mu^-, CP violating D -> h^+ h^- and
isospin violating B -> K^(*) mu^+ mu^- decays. We show that a light axigluon
can contribute to the observed CP violation in D -> h^+ h^- decays.
| [
{
"created": "Thu, 17 Jan 2013 06:11:47 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jul 2013 22:13:30 GMT",
"version": "v2"
}
] | 2013-07-09 | [
[
"Ipek",
"Seyda",
""
]
] | The light axigluon model of Tavares and Schmaltz is a viable candidate to explain the Tevatron t-tbar forward-backward asymmetry. In this paper we present the forward-backward asymmetries for b-bbar and c-cbar systems predicted by the light axigluon. Furthermore, we modify this model to include flavor changing couplings of axigluons with the SM quarks. We constrain these couplings from the available neutral meson mixing data, and investigate their effects on the rare decay B^0_s -> mu^+ mu^-, CP violating D -> h^+ h^- and isospin violating B -> K^(*) mu^+ mu^- decays. We show that a light axigluon can contribute to the observed CP violation in D -> h^+ h^- decays. |
hep-ph/9407278 | Ofelia | F. Buccella, O. Pisanti, and F. Sannino | Energy-Charge Correlation in the $\pi^+\pi^-\pi^0$ Decay of $K_L$ and of
Tagged Neutral Kaons | 15 A4-pages LaTeX + 2 figures (available in hard copies from the
authors upon request to pisanti@na.infn.it), preprint DSF-93/52, SUHEP-582 | Z.Phys. C66 (1995) 135-140 | 10.1007/BF01496588 | null | hep-ph | null | We relate the asymmetries in the charged pions energy in the decay into
$\pi^+\pi^-\pi^0$ of $K_L$ and of the tagged neutral kaons. The former
asymmetry is a given combination of $\Re(\epsilon)$, $\Im(\epsilon)$, and
$|\epsilon'|$. Moreover, the non-violating CP asymmetry allows a test for the
$\chi$PT predictions within the Zel'dovich approach for the final state
interaction.
| [
{
"created": "Tue, 12 Jul 1994 10:23:05 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Buccella",
"F.",
""
],
[
"Pisanti",
"O.",
""
],
[
"Sannino",
"F.",
""
]
] | We relate the asymmetries in the charged pions energy in the decay into $\pi^+\pi^-\pi^0$ of $K_L$ and of the tagged neutral kaons. The former asymmetry is a given combination of $\Re(\epsilon)$, $\Im(\epsilon)$, and $|\epsilon'|$. Moreover, the non-violating CP asymmetry allows a test for the $\chi$PT predictions within the Zel'dovich approach for the final state interaction. |
hep-ph/0206011 | Antonio Pich Zardoya | Antonio Pich | The Standard Model of Particle Physics: Status & Low-Energy Tests | 12 pages, 6 Postscript Figures | Proceedings of the ESO-CERN-ESA Symposium on "Astronomy, Cosmology
and Fundamental Physics" (Garching bei M\"unchen, Germany, 4-7 March 2002) | 10.1007/10857580_10 | IFIC/02-24, FTUV/02-0603 | hep-ph | null | Precision measurements of low-energy observables provide stringent tests of
the Standard Model structure and accurate determinations of its parameters. An
overview of the present experimental status is presented. The main topics
discussed are the muon anomalous magnetic moment, the asymptotic freedom of
strong interactions, the lepton universality of gauge couplings, the quark
flavour structure and CP violation.
| [
{
"created": "Mon, 3 Jun 2002 12:22:31 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Pich",
"Antonio",
""
]
] | Precision measurements of low-energy observables provide stringent tests of the Standard Model structure and accurate determinations of its parameters. An overview of the present experimental status is presented. The main topics discussed are the muon anomalous magnetic moment, the asymptotic freedom of strong interactions, the lepton universality of gauge couplings, the quark flavour structure and CP violation. |
1008.3129 | Dmitri Melikhov | Wolfgang Lucha, Dmitri Melikhov, Silvano Simula | Heavy-meson decay constants from QCD sum rules | 6 pages, Talk given at QCD@Work - International Workshop on QCD -
Theory and Experiment, 20 - 23 June, 2010, Martina Franca Italy | AIP Conf.Proc.1317:310-315,2011 | 10.1063/1.3536576 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We sketch a recent sum-rule extraction of the decay constants of the heavy
pseudoscalar mesons D, D_s, B, and B_s from the two-point correlator of
heavy-light pseudoscalar currents [1]. Our main emphasis lies on the control
over all the uncertainties in the decay constants, related both to the input
QCD parameters and to the limited accuracy of the method of sum rules. Gaining
this control has become possible by application of our new procedure of
extracting hadron observables based on a dual threshold depending on the Borel
parameter. For the charmed-meson decay constants, we find f_D=206.2\pm 7.3(OPE)
\pm 5.1(syst) MeV, f_Ds=245.3\pm 15.7(OPE) \pm 4.5(syst) MeV. For the beauty
mesons, the decay constants turn out to be extremely sensitive to the precise
value of the MSbar mass of the b-quark, mb(mb). By requiring our sum-rule
estimate to match the average of the lattice determinations of f_B, we extract
the rather accurate value mb(mb)=(4.245\pm 0.025) GeV. Feeding this parameter
value into our sum-rule formalism leads to the beauty-meson decay constants f_B
= 193.4 \pm 12.3(OPE) \pm 4.3(syst) MeV, f_Bs =232.5 \pm 18.6(OPE) \pm
2.4(syst) MeV.
| [
{
"created": "Wed, 18 Aug 2010 16:33:25 GMT",
"version": "v1"
}
] | 2011-02-01 | [
[
"Lucha",
"Wolfgang",
""
],
[
"Melikhov",
"Dmitri",
""
],
[
"Simula",
"Silvano",
""
]
] | We sketch a recent sum-rule extraction of the decay constants of the heavy pseudoscalar mesons D, D_s, B, and B_s from the two-point correlator of heavy-light pseudoscalar currents [1]. Our main emphasis lies on the control over all the uncertainties in the decay constants, related both to the input QCD parameters and to the limited accuracy of the method of sum rules. Gaining this control has become possible by application of our new procedure of extracting hadron observables based on a dual threshold depending on the Borel parameter. For the charmed-meson decay constants, we find f_D=206.2\pm 7.3(OPE) \pm 5.1(syst) MeV, f_Ds=245.3\pm 15.7(OPE) \pm 4.5(syst) MeV. For the beauty mesons, the decay constants turn out to be extremely sensitive to the precise value of the MSbar mass of the b-quark, mb(mb). By requiring our sum-rule estimate to match the average of the lattice determinations of f_B, we extract the rather accurate value mb(mb)=(4.245\pm 0.025) GeV. Feeding this parameter value into our sum-rule formalism leads to the beauty-meson decay constants f_B = 193.4 \pm 12.3(OPE) \pm 4.3(syst) MeV, f_Bs =232.5 \pm 18.6(OPE) \pm 2.4(syst) MeV. |
hep-ph/0207208 | Arjun Berera | Arjun Berera and Thomas W. Kephart | Inflation and Generalized O'Raifeartaigh SUSY models | 5 pages, latex, In Press Physics Letters B 2003 | Phys.Lett. B578 (2004) 1-6 | 10.1016/j.physletb.2003.10.060 | null | hep-ph astro-ph hep-th | null | Thermal inflation usually requires an inflationary potential with
nonrenormalizable operators (NROs). We demonstrate how O'Raifeartaigh models
with or without NROs can provide thermal inflation and a solution to the moduli
problem, as well as provide SUSY breaking. We then discuss a scenario where
generalized O'Raifeartaigh potentials (with NROs) are included in a SUGRA where
the supergravity and O'Raifeartaigh potentials provide negative and a positive
contributions to the cosmological constant respectively. Tuning these
contributions to nearly cancel can provide the present value of the dark
energy.
| [
{
"created": "Wed, 17 Jul 2002 15:24:35 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Oct 2003 18:19:24 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Berera",
"Arjun",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | Thermal inflation usually requires an inflationary potential with nonrenormalizable operators (NROs). We demonstrate how O'Raifeartaigh models with or without NROs can provide thermal inflation and a solution to the moduli problem, as well as provide SUSY breaking. We then discuss a scenario where generalized O'Raifeartaigh potentials (with NROs) are included in a SUGRA where the supergravity and O'Raifeartaigh potentials provide negative and a positive contributions to the cosmological constant respectively. Tuning these contributions to nearly cancel can provide the present value of the dark energy. |
1010.0892 | Wei-jie Fu | Wei-jie Fu and Yue-liang Wu | Fourth-order Correlations of Conserved Charges in the QCD Thermodynamics | 13 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fourth-order correlations of conserved charges, such as the baryon
number, electric charge, and strangeness, are studied at finite temperature and
nonzero baryon chemical potential in an effective model. It is found that the
fourth-order correlations change rapidly and have three extrema during the
chiral crossover with the increase of the baryon chemical potential. The
absolute values of the extrema approach infinity when the thermodynamical
system moves toward the QCD critical point and the fourth-order correlations
are divergent at the critical point. The contour plots of the fourth-order
correlations in the plane of the temperature and baryon chemical potential are
given. It is noticed that all the fourth-order correlations of conserved
charges, except for $\chi_{13}^{BS}$ and $\chi_{13}^{QS}$, are excellent probes
to explore the QCD critical point in heavy ion collision experiments.
| [
{
"created": "Tue, 5 Oct 2010 14:17:51 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Fu",
"Wei-jie",
""
],
[
"Wu",
"Yue-liang",
""
]
] | The fourth-order correlations of conserved charges, such as the baryon number, electric charge, and strangeness, are studied at finite temperature and nonzero baryon chemical potential in an effective model. It is found that the fourth-order correlations change rapidly and have three extrema during the chiral crossover with the increase of the baryon chemical potential. The absolute values of the extrema approach infinity when the thermodynamical system moves toward the QCD critical point and the fourth-order correlations are divergent at the critical point. The contour plots of the fourth-order correlations in the plane of the temperature and baryon chemical potential are given. It is noticed that all the fourth-order correlations of conserved charges, except for $\chi_{13}^{BS}$ and $\chi_{13}^{QS}$, are excellent probes to explore the QCD critical point in heavy ion collision experiments. |
1009.2818 | Masahiro Ibe | Masahiro Ibe, Yuri Shirman, Tsutomu T. Yanagida | Cascade supersymmetry breaking and low-scale gauge mediation | 27 pages, 3 figures | JHEP 1012:027,2010 | 10.1007/JHEP12(2010)027 | IPMU10-0140 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new class of models with gauge mediated supersymmetry breaking,
the cascade supersymmetry breaking. This class of models is consistent with the
gravitino mass as low as O(1)eV without having suppressed gaugino masses, nor
the Landau pole problems of the gauge coupling constants of the Standard Model
below the scale of the grand unification. In particular, there is no
supersymmetric vacuum in the vicinity of the supersymmetry breaking vacuum even
for such a low gravitino mass. Thus, the model does not have a vacuum stability
problem decaying into supersymmetric vacua.
| [
{
"created": "Wed, 15 Sep 2010 02:13:25 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Oct 2010 05:32:29 GMT",
"version": "v2"
}
] | 2010-12-14 | [
[
"Ibe",
"Masahiro",
""
],
[
"Shirman",
"Yuri",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We propose a new class of models with gauge mediated supersymmetry breaking, the cascade supersymmetry breaking. This class of models is consistent with the gravitino mass as low as O(1)eV without having suppressed gaugino masses, nor the Landau pole problems of the gauge coupling constants of the Standard Model below the scale of the grand unification. In particular, there is no supersymmetric vacuum in the vicinity of the supersymmetry breaking vacuum even for such a low gravitino mass. Thus, the model does not have a vacuum stability problem decaying into supersymmetric vacua. |
1704.06993 | M. N. Rebelo | G. C. Branco and M. N. Rebelo | The discrete charm of flavour and CP violation | 10 pages, no figures. Prepared for the proceedings of DISCRETE2016:
the Fifth Symposium on Prospects in the Physics of Discrete Symmetries, 28
November-3 December 2016, University of Warsaw, Poland, to appear in the
Journal of Physics: Conference Series (JPCS) | null | 10.1088/1742-6596/873/1/012011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that in the Standard Model (SM) there is no explanation why
$|V_{23}|^2 + |V_{13}|^2$ is of order $10^{-3}$. A framework is described for
explaining this small mixing, involving the introduction of vector-like quarks.
A symmetry is introduced so that at a first stage $V_{CKM} =
1\>\!\!\!\mathrm{I}$ and only the third generation of quarks acquires a mass.
It is shown that when interactions of vector-like quarks are taken into account
a realistic quark mass spectrum is generated together with a correct $V_{CKM}$
matrix.
| [
{
"created": "Sun, 23 Apr 2017 22:28:37 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Branco",
"G. C.",
""
],
[
"Rebelo",
"M. N.",
""
]
] | We point out that in the Standard Model (SM) there is no explanation why $|V_{23}|^2 + |V_{13}|^2$ is of order $10^{-3}$. A framework is described for explaining this small mixing, involving the introduction of vector-like quarks. A symmetry is introduced so that at a first stage $V_{CKM} = 1\>\!\!\!\mathrm{I}$ and only the third generation of quarks acquires a mass. It is shown that when interactions of vector-like quarks are taken into account a realistic quark mass spectrum is generated together with a correct $V_{CKM}$ matrix. |
1204.5572 | Thorsten Renk | Thorsten Renk | Energy dependence of the dijet imbalance in Pb-Pb collisions at 2.76
ATeV | 4 pages, 1 figure | null | 10.1103/PhysRevC.86.061901 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The appearance of monojets is among the most striking signature of jet
quenching in the context of ultrarelativistic heavy-ion collisions at the Large
Hadron Collider. Experimentally, the asymmetry of back-to-back jets is
quantified in terms of the dijet imbalance distribution by the ATLAS and CMS
collaborations. Recently, the CMS collaboration has also studied the trigger
jet momentum (P_T) dependence of the imbalance in the range between 120 and 500
GeV which is found to decrease with jet P_T. In this work, results from the
in-medium shower code YaJEM are compared with this data set. These results
suggest that the main effects observed in the data are the kinematical
collimation of jets and the increase in the probability to produce more
collimated quark jets with jet P_T, whereas there is no indication for any
non-trivial energy dependence of the shower-medium interaction mechanism
itself. The data furthermore can rule out models in which the jet shape is
collimated due to the medium modification.
| [
{
"created": "Wed, 25 Apr 2012 06:47:46 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Renk",
"Thorsten",
""
]
] | The appearance of monojets is among the most striking signature of jet quenching in the context of ultrarelativistic heavy-ion collisions at the Large Hadron Collider. Experimentally, the asymmetry of back-to-back jets is quantified in terms of the dijet imbalance distribution by the ATLAS and CMS collaborations. Recently, the CMS collaboration has also studied the trigger jet momentum (P_T) dependence of the imbalance in the range between 120 and 500 GeV which is found to decrease with jet P_T. In this work, results from the in-medium shower code YaJEM are compared with this data set. These results suggest that the main effects observed in the data are the kinematical collimation of jets and the increase in the probability to produce more collimated quark jets with jet P_T, whereas there is no indication for any non-trivial energy dependence of the shower-medium interaction mechanism itself. The data furthermore can rule out models in which the jet shape is collimated due to the medium modification. |
hep-ph/0110060 | Michael C. Birse | Alexander N. Kvinikhidze, Michael C. Birse (University of Manchester),
Boris Blankleider (Flinders University) | Pionic dressing of baryons in chiral quark models | 14 pages, 4 figures (RevTeX, epsf) Further discussion and references
added | Phys.Rev. C66 (2002) 045203 | 10.1103/PhysRevC.66.045203 | null | hep-ph | null | We present a method for constructing the complete set of meson-exchange
corrections to baryon observables described by covariant chiral quark models.
The meson corrections are expressed in terms of an unperturbed valence-quark
Green's function. This method is illustrated for the case of an NJL model. It
also enables us to discuss, in terms of approximations used for this
unperturbed Green's function, the treatments of meson corrections in two other
chiral quark models.
| [
{
"created": "Thu, 4 Oct 2001 11:52:45 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2002 09:01:46 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Aug 2002 08:56:49 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Kvinikhidze",
"Alexander N.",
"",
"University of Manchester"
],
[
"Birse",
"Michael C.",
"",
"University of Manchester"
],
[
"Blankleider",
"Boris",
"",
"Flinders University"
]
] | We present a method for constructing the complete set of meson-exchange corrections to baryon observables described by covariant chiral quark models. The meson corrections are expressed in terms of an unperturbed valence-quark Green's function. This method is illustrated for the case of an NJL model. It also enables us to discuss, in terms of approximations used for this unperturbed Green's function, the treatments of meson corrections in two other chiral quark models. |
hep-ph/9903301 | Per Osland | P. Osland (Bergen) | Higgs boson production in e^+e^- and e^-e^- collisions | 18 pages, LaTeX, including 13 figures. Invited paper, Epiphany
Conference on Electron-Positron Colliders, Cracow, January 1999, to appear in
the proceedings | Acta Phys.Polon.B30:1967-1984,1999 | null | Bergen 1999-02 | hep-ph | null | When Higgs boson candidates will be found at future colliders, it becomes
imperative to determine their properties, beyond the mass, production cross
section and decay rates. Other crucial properties are those related to the
behaviour under CP transformations, and the self-couplings. This paper
addresses the question of measurability of some of the trilinear couplings of
MSSM neutral Higgs bosons at a high-energy e^+e^- collider, and the
possibilities of exploring the Higgs boson CP properties at e^+e^- and e^-e^-
colliders.
| [
{
"created": "Tue, 9 Mar 1999 19:30:00 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Osland",
"P.",
"",
"Bergen"
]
] | When Higgs boson candidates will be found at future colliders, it becomes imperative to determine their properties, beyond the mass, production cross section and decay rates. Other crucial properties are those related to the behaviour under CP transformations, and the self-couplings. This paper addresses the question of measurability of some of the trilinear couplings of MSSM neutral Higgs bosons at a high-energy e^+e^- collider, and the possibilities of exploring the Higgs boson CP properties at e^+e^- and e^-e^- colliders. |
hep-ph/0601239 | Hyun-Chul Kim | Antonio Silva, Hyun-Chul Kim, Diana Urbano, Klaus Goeke | Parity-violating aysmmetries in elastic $\vec{e}p$ scattering in the
chiral quark-soliton model: Comparison with A4, G0, HAPPEX and SAMPLE | 11 pages, 11 figures | Phys.Rev.D74:054011,2006 | 10.1103/PhysRevD.74.054011 | PNU-NTG-11/2005, RUB-TPII-09/2005 | hep-ph | null | We investigate parity-violating electroweak asymmetries in the elastic
scattering of polarized electrons off protons within the framework of the
chiral quark-soliton model ($\chi$QSM). We use as input the former results of
the electromagnetic and strange form factors and newly calculated SU(3)
axial-vector form factors, all evaluated with the same set of four parameters
adjusted several years ago to general mesonic and baryonic properties. Based on
this scheme, which yields positive electric and magnetic strange form factors
with a $\mu_s=(0.08-0.13)\mu_N$, we determine the parity-violating asymmetries
of elastic polarized electron-proton scattering. The results are in a good
agreement with the data of the A4, HAPPEX, and SAMPLE experiments and reproduce
the full $Q^2$-range of the G0-data. We also predict the parity-violating
asymmetries for the backward G0 experiment.
| [
{
"created": "Sun, 29 Jan 2006 05:59:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Silva",
"Antonio",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Urbano",
"Diana",
""
],
[
"Goeke",
"Klaus",
""
]
] | We investigate parity-violating electroweak asymmetries in the elastic scattering of polarized electrons off protons within the framework of the chiral quark-soliton model ($\chi$QSM). We use as input the former results of the electromagnetic and strange form factors and newly calculated SU(3) axial-vector form factors, all evaluated with the same set of four parameters adjusted several years ago to general mesonic and baryonic properties. Based on this scheme, which yields positive electric and magnetic strange form factors with a $\mu_s=(0.08-0.13)\mu_N$, we determine the parity-violating asymmetries of elastic polarized electron-proton scattering. The results are in a good agreement with the data of the A4, HAPPEX, and SAMPLE experiments and reproduce the full $Q^2$-range of the G0-data. We also predict the parity-violating asymmetries for the backward G0 experiment. |
1401.0080 | Tilman Plehn | Kyle Cranmer, Sven Kreiss, David Lopez-Val and Tilman Plehn | Decoupling Theoretical Uncertainties from Measurements of the Higgs
Boson | published version | Phys. Rev. D 91, 054032 (2015) | 10.1103/PhysRevD.91.054032 | null | hep-ph physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a technique to present Higgs coupling measurements, which decouple
the poorly defined theoretical uncertainties associated to inclusive and
exclusive cross section predictions. The technique simplifies the combination
of multiple measurements and can be used in a more general setting. We
illustrate the approach with toy LHC Higgs coupling measurements and a
collection of new physics models.
| [
{
"created": "Tue, 31 Dec 2013 03:34:39 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Oct 2014 20:31:09 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Apr 2015 08:29:55 GMT",
"version": "v3"
}
] | 2015-04-08 | [
[
"Cranmer",
"Kyle",
""
],
[
"Kreiss",
"Sven",
""
],
[
"Lopez-Val",
"David",
""
],
[
"Plehn",
"Tilman",
""
]
] | We develop a technique to present Higgs coupling measurements, which decouple the poorly defined theoretical uncertainties associated to inclusive and exclusive cross section predictions. The technique simplifies the combination of multiple measurements and can be used in a more general setting. We illustrate the approach with toy LHC Higgs coupling measurements and a collection of new physics models. |
1706.02722 | Kevin Kelly | Jeffrey M. Berryman, Andr\'e de Gouv\^ea, Kevin J. Kelly, and Yue
Zhang | Dark Matter and Neutrino Mass from the Smallest Non-Abelian Chiral Dark
Sector | 35 pages, 7 figures. Matches published version | Phys. Rev. D 96, 075010 (2017) | 10.1103/PhysRevD.96.075010 | NUHEP-TH/17-04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All pieces of concrete evidence for phenomena outside the standard model (SM)
- neutrino masses and dark matter - are consistent with the existence of new
degrees of freedom that interact very weakly, if at all, with those in the SM.
We propose that these new degrees of freedom organize themselves into a simple
dark sector, a chiral SU(3) x SU(2) gauge theory with the smallest nontrivial
fermion content. Similar to the SM, the dark SU(2) is spontaneously broken
while the dark SU(3) confines at low energies. At the renormalizable level, the
dark sector contains massless fermions - dark leptons - and stable massive
particles - dark protons. We find that dark protons with masses between 10-100
TeV satisfy all current cosmological and astrophysical observations concerning
dark matter even if dark protons are a symmetric thermal relic. The dark
leptons play the role of right-handed neutrinos and allow simple realizations
of the seesaw mechanism or the possibility that neutrinos are Dirac fermions.
In the latter case, neutrino masses are also parametrically different from
charged-fermion masses and the lightest neutrino is predicted to be massless.
Since the new "neutrino" and "dark matter" degrees of freedom interact with one
another, these two new-physics phenomena are intertwined. Dark leptons play a
nontrivial role in early universe cosmology while indirect searches for dark
matter involve, decisively, dark matter annihilations into dark leptons. These,
in turn, may lead to observable signatures at high-energy neutrino and
gamma-ray observatories, especially once one accounts for the potential
Sommerfeld enhancement of the annihilation cross-section, derived from the
low-energy dark-sector effective theory, a possibility we explore
quantitatively in some detail.
| [
{
"created": "Thu, 8 Jun 2017 18:13:43 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2017 19:16:20 GMT",
"version": "v2"
}
] | 2017-10-18 | [
[
"Berryman",
"Jeffrey M.",
""
],
[
"de Gouvêa",
"André",
""
],
[
"Kelly",
"Kevin J.",
""
],
[
"Zhang",
"Yue",
""
]
] | All pieces of concrete evidence for phenomena outside the standard model (SM) - neutrino masses and dark matter - are consistent with the existence of new degrees of freedom that interact very weakly, if at all, with those in the SM. We propose that these new degrees of freedom organize themselves into a simple dark sector, a chiral SU(3) x SU(2) gauge theory with the smallest nontrivial fermion content. Similar to the SM, the dark SU(2) is spontaneously broken while the dark SU(3) confines at low energies. At the renormalizable level, the dark sector contains massless fermions - dark leptons - and stable massive particles - dark protons. We find that dark protons with masses between 10-100 TeV satisfy all current cosmological and astrophysical observations concerning dark matter even if dark protons are a symmetric thermal relic. The dark leptons play the role of right-handed neutrinos and allow simple realizations of the seesaw mechanism or the possibility that neutrinos are Dirac fermions. In the latter case, neutrino masses are also parametrically different from charged-fermion masses and the lightest neutrino is predicted to be massless. Since the new "neutrino" and "dark matter" degrees of freedom interact with one another, these two new-physics phenomena are intertwined. Dark leptons play a nontrivial role in early universe cosmology while indirect searches for dark matter involve, decisively, dark matter annihilations into dark leptons. These, in turn, may lead to observable signatures at high-energy neutrino and gamma-ray observatories, especially once one accounts for the potential Sommerfeld enhancement of the annihilation cross-section, derived from the low-energy dark-sector effective theory, a possibility we explore quantitatively in some detail. |
hep-ph/9402328 | Luc Marleau | B.Dion and L. Marleau | Skyrmion solutions by generalization of the Atiyah-Manton ansatz | 12 pages, revtex v3, EP-CPTh.A280.0194 and LAVAL-PHY-12-93 | Phys.Rev.D49:5526-5531,1994 | 10.1103/PhysRevD.49.5526 | null | hep-ph | null | We generalize the approach of Atiyah and Manton for generating Skyrmion
configurations from instantons. The result is a series which parameters are
found directly from the chiral angle equation. The series converge rapidly to
the exact solution for a class of the Skyrme-like models (including the Skyrme
model itself) but describe with less accuracy other types of models. We
describe the procedure and discuss its advantages and limitations.
| [
{
"created": "Mon, 21 Feb 1994 11:20:30 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 1994 16:02:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dion",
"B.",
""
],
[
"Marleau",
"L.",
""
]
] | We generalize the approach of Atiyah and Manton for generating Skyrmion configurations from instantons. The result is a series which parameters are found directly from the chiral angle equation. The series converge rapidly to the exact solution for a class of the Skyrme-like models (including the Skyrme model itself) but describe with less accuracy other types of models. We describe the procedure and discuss its advantages and limitations. |
1408.3219 | Juan Barranco | J. Barranco, D. Delepine, V. Gonzalez Macias, C. Lujan-Peschard and M.
Napsuciale | Scattering processes could distinguish Majorana from Dirac neutrinos | 12 pages, 5 figures | null | 10.1016/j.physletb.2014.11.008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that Majorana neutrinos have a pure axial neutral current
interaction while Dirac neutrinos have the standard vector-axial interaction.
In spite of this crucial difference, usually Dirac neutrino processes differ
from Majorana processes by a term proportional to the neutrino mass, resulting
in almost unmeasurable observations of this difference. In the present work we
show that once the neutrino polarization evolution is considered, there are
clear differences between Dirac and Majorana scattering on electrons. The
change of polarization can be achieved in astrophysical environments with
strong magnetic fields. Furthermore, we show that in the case of unpolarized
neutrino scattering onto polarized electrons, this difference can be relevant
even for large values of the neutrino energy.
| [
{
"created": "Thu, 14 Aug 2014 08:42:57 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Barranco",
"J.",
""
],
[
"Delepine",
"D.",
""
],
[
"Macias",
"V. Gonzalez",
""
],
[
"Lujan-Peschard",
"C.",
""
],
[
"Napsuciale",
"M.",
""
]
] | It is well known that Majorana neutrinos have a pure axial neutral current interaction while Dirac neutrinos have the standard vector-axial interaction. In spite of this crucial difference, usually Dirac neutrino processes differ from Majorana processes by a term proportional to the neutrino mass, resulting in almost unmeasurable observations of this difference. In the present work we show that once the neutrino polarization evolution is considered, there are clear differences between Dirac and Majorana scattering on electrons. The change of polarization can be achieved in astrophysical environments with strong magnetic fields. Furthermore, we show that in the case of unpolarized neutrino scattering onto polarized electrons, this difference can be relevant even for large values of the neutrino energy. |
hep-ph/0205167 | Anne Billups | A.H. Mueller, D.N. Triantafyllopoulos (Columbia University) | The Energy Dependence of the Saturation Momentum | 27 pages, 4 figures, Latex | Nucl.Phys. B640 (2002) 331-350 | 10.1016/S0550-3213(02)00581-3 | CU-TP-1057 | hep-ph | null | We study BFKL evolution and, in particular, the energy dependence of the
saturation momentum in the presence of saturation boundaries limiting the
region of linear BFKL evolution. In the case of fixed coupling evolution we
confirm the previously found exponential term in $Q_s(Y)$ and determine the
prefactor $Y$ and $\alpha$ dependences. In the running coupling case we find
$Y^{1/6}$ corrections to the $Y^{1/2}$exponential behavior previously known.
Geometrical scaling of the scattering amplitude is valid in a wide-range of
momenta for fixed coupling evolution and in a more restricted region for
running coupling evolution.
| [
{
"created": "Wed, 15 May 2002 16:53:00 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Mueller",
"A. H.",
"",
"Columbia University"
],
[
"Triantafyllopoulos",
"D. N.",
"",
"Columbia University"
]
] | We study BFKL evolution and, in particular, the energy dependence of the saturation momentum in the presence of saturation boundaries limiting the region of linear BFKL evolution. In the case of fixed coupling evolution we confirm the previously found exponential term in $Q_s(Y)$ and determine the prefactor $Y$ and $\alpha$ dependences. In the running coupling case we find $Y^{1/6}$ corrections to the $Y^{1/2}$exponential behavior previously known. Geometrical scaling of the scattering amplitude is valid in a wide-range of momenta for fixed coupling evolution and in a more restricted region for running coupling evolution. |
1112.2573 | Edward Shuryak | Edward Shuryak | Toward the AdS/CFT dual of the "Little Bang" | a review to appear in topical volume of reviews collected by editors,
S.Bass and G.Casaladerrey-Solana | null | 10.1088/0954-3899/39/5/054001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This (rather subjective) review sums up few years of work devoted to explain
various aspects of high energy heavy ion collisions using the AdS/CFT
correspondence. The central issue of is is formation of the trapped surface
(black hole) phenomenon, seen by a distant observer as the entropy production.
We end up discussing an issue of classical gravitational radiation by an
ultrarelativistic falling body and the so called breaking self-force related to
it.
| [
{
"created": "Mon, 12 Dec 2011 14:54:55 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Shuryak",
"Edward",
""
]
] | This (rather subjective) review sums up few years of work devoted to explain various aspects of high energy heavy ion collisions using the AdS/CFT correspondence. The central issue of is is formation of the trapped surface (black hole) phenomenon, seen by a distant observer as the entropy production. We end up discussing an issue of classical gravitational radiation by an ultrarelativistic falling body and the so called breaking self-force related to it. |
hep-ph/0101019 | Vergados Ioannis | J.D. Vergados (Theoretical Physics Division, University of Ioannina) | Searching for Supersymmetric Dark Matter - The Directional Rate and the
Modulation Effect Due to Caustic Rings | 31 LATEX pages, 2 tables and 1 figure included. Accepted for
publication in Physical Review D | Phys.Rev.D63:063511,2001 | 10.1103/PhysRevD.63.063511 | null | hep-ph | null | The detection of the theoretically expected dark matter is central to
particle physics and cosmology. Current fashionable supersymmetric models
provide a natural dark matter candidate which is the lightest supersymmetric
particle (LSP). The allowed parameter space of such models combined with fairly
well understood physics (quark substructure of the nucleon and nuclear
structure) permit the evaluation of the event rate for LSP-nucleus elastic
scattering. The thus obtained event rates, which sensitively depend on the
allowed parameter space parameters, are usually very low or even undetectable.
So, for background reduction, one would like to exploit two nice features of
the reaction, the directional rate, which depends on the sun's direction of
motion and the modulation effect, i.e. the dependence of the event rate on the
earth's annual motion. In the present paper we study these phenomena in a
specific class of non isothermal models, which take into account the late
in-fall of dark matter into our galaxy, producing flows of caustic rings. We
find that the modulation effect arising from such models is smaller than that
found previously with isothermal symmetric velocity distributions and much
smaller compared to that obtained using a realistic asymmetric distribution
with enhanced dispersion in the galactocentric direction.
| [
{
"created": "Tue, 2 Jan 2001 19:27:16 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Vergados",
"J. D.",
"",
"Theoretical Physics Division, University of Ioannina"
]
] | The detection of the theoretically expected dark matter is central to particle physics and cosmology. Current fashionable supersymmetric models provide a natural dark matter candidate which is the lightest supersymmetric particle (LSP). The allowed parameter space of such models combined with fairly well understood physics (quark substructure of the nucleon and nuclear structure) permit the evaluation of the event rate for LSP-nucleus elastic scattering. The thus obtained event rates, which sensitively depend on the allowed parameter space parameters, are usually very low or even undetectable. So, for background reduction, one would like to exploit two nice features of the reaction, the directional rate, which depends on the sun's direction of motion and the modulation effect, i.e. the dependence of the event rate on the earth's annual motion. In the present paper we study these phenomena in a specific class of non isothermal models, which take into account the late in-fall of dark matter into our galaxy, producing flows of caustic rings. We find that the modulation effect arising from such models is smaller than that found previously with isothermal symmetric velocity distributions and much smaller compared to that obtained using a realistic asymmetric distribution with enhanced dispersion in the galactocentric direction. |
hep-ph/0310276 | Andrzej Czarnecki | Andrzej Czarnecki, William J. Marciano, and Arkady Vainshtein | Triangle Anomaly and the Muon g-2 | 9 pages, latex | Acta Phys.Polon. B34 (2003) 5669-5678 | null | Alberta Thy 11-03 | hep-ph | null | Hadronic electroweak corrections to the muon anomalous magnetic moment (g-2)
are reviewed. Emphasis is on clarification of discrepancies among various
published studies. A theorem on non-renormalization of the transversal part of
a correlator of two vector currents and an axial current is reviewed and its
consequences in the form of superconvergent sum rules are discussed.
| [
{
"created": "Thu, 23 Oct 2003 15:40:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Czarnecki",
"Andrzej",
""
],
[
"Marciano",
"William J.",
""
],
[
"Vainshtein",
"Arkady",
""
]
] | Hadronic electroweak corrections to the muon anomalous magnetic moment (g-2) are reviewed. Emphasis is on clarification of discrepancies among various published studies. A theorem on non-renormalization of the transversal part of a correlator of two vector currents and an axial current is reviewed and its consequences in the form of superconvergent sum rules are discussed. |
1704.05783 | Mathieu Pellen | Benedikt Biedermann, Stephan Br\"auer, Ansgar Denner, Mathieu Pellen,
Steffen Schumann, Jennifer M. Thompson | Automation of NLO QCD and EW corrections with Sherpa and Recola | 38 pages, 29 figures. Matches the published version (few typos
corrected) | Eur.Phys.J. C77 (2017) 492 | 10.1140/epjc/s10052-017-5054-8 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This publication presents the combination of the one-loop matrix-element
generator Recola with the multipurpose Monte Carlo program Sherpa. Since both
programs are highly automated, the resulting Sherpa+Recola framework allows for
the computation of -in principle- any Standard Model process at both NLO QCD
and EW accuracy. To illustrate this, three representative LHC processes have
been computed at NLO QCD and EW: vector-boson production in association with
jets, off-shell Z-boson pair production, and the production of a top-quark pair
in association with a Higgs boson. In addition to fixed-order computations,
when considering QCD corrections, all functionalities of Sherpa, i.e. particle
decays, QCD parton showers, hadronisation, underlying events, etc. can be used
in combination with Recola. This is demonstrated by the merging and matching of
one-loop QCD matrix elements for Drell-Yan production in association with jets
to the parton shower. The implementation is fully automatised, thus making it a
perfect tool for both experimentalists and theorists who want to use
state-of-the-art predictions at NLO accuracy.
| [
{
"created": "Wed, 19 Apr 2017 15:42:45 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2017 11:08:37 GMT",
"version": "v2"
}
] | 2018-08-10 | [
[
"Biedermann",
"Benedikt",
""
],
[
"Bräuer",
"Stephan",
""
],
[
"Denner",
"Ansgar",
""
],
[
"Pellen",
"Mathieu",
""
],
[
"Schumann",
"Steffen",
""
],
[
"Thompson",
"Jennifer M.",
""
]
] | This publication presents the combination of the one-loop matrix-element generator Recola with the multipurpose Monte Carlo program Sherpa. Since both programs are highly automated, the resulting Sherpa+Recola framework allows for the computation of -in principle- any Standard Model process at both NLO QCD and EW accuracy. To illustrate this, three representative LHC processes have been computed at NLO QCD and EW: vector-boson production in association with jets, off-shell Z-boson pair production, and the production of a top-quark pair in association with a Higgs boson. In addition to fixed-order computations, when considering QCD corrections, all functionalities of Sherpa, i.e. particle decays, QCD parton showers, hadronisation, underlying events, etc. can be used in combination with Recola. This is demonstrated by the merging and matching of one-loop QCD matrix elements for Drell-Yan production in association with jets to the parton shower. The implementation is fully automatised, thus making it a perfect tool for both experimentalists and theorists who want to use state-of-the-art predictions at NLO accuracy. |
2403.11702 | Sreeraj Sreedharan Nair | Sreeraj Nair, Chandan Mondal, Siqi Xu, Xingbo Zhao, Asmita Mukherjee
and James P. Vary | Gravitational Form Factors and Mechanical Properties of Quarks in
Protons: A Basis Light-Front Quantization Approach | 28 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We compute the gravitational form factors (GFFs) and study their applications
for the description of the mechanical properties such as the pressure, shear
force distributions, and the mechanical radius of the proton from its
light-front wave functions (LFWFs) based on basis light-front quantization
(BLFQ). The LFWFs of the proton are given by the lowest eigenvector of a
light-front effective Hamiltonian that incorporates a three-dimensional
confining potential and a one-gluon exchange interaction with fixed coupling
between the constituent quarks solved in the valence Fock sector. We find
acceptable agreement between our BLFQ computations and the lattice QCD for the
GFFs. Our $D$-term form factor also agrees well with the extracted data from
the deeply virtual Compton scattering experiments at Jefferson Lab, and the
results of different phenomenological models. The distributions of pressures
and shear forces are similar to those from different models.
| [
{
"created": "Mon, 18 Mar 2024 11:59:07 GMT",
"version": "v1"
}
] | 2024-03-19 | [
[
"Nair",
"Sreeraj",
""
],
[
"Mondal",
"Chandan",
""
],
[
"Xu",
"Siqi",
""
],
[
"Zhao",
"Xingbo",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Vary",
"James P.",
""
]
] | We compute the gravitational form factors (GFFs) and study their applications for the description of the mechanical properties such as the pressure, shear force distributions, and the mechanical radius of the proton from its light-front wave functions (LFWFs) based on basis light-front quantization (BLFQ). The LFWFs of the proton are given by the lowest eigenvector of a light-front effective Hamiltonian that incorporates a three-dimensional confining potential and a one-gluon exchange interaction with fixed coupling between the constituent quarks solved in the valence Fock sector. We find acceptable agreement between our BLFQ computations and the lattice QCD for the GFFs. Our $D$-term form factor also agrees well with the extracted data from the deeply virtual Compton scattering experiments at Jefferson Lab, and the results of different phenomenological models. The distributions of pressures and shear forces are similar to those from different models. |
0902.0455 | T. Lappi | T. Lappi | RHIC data and small x physics | 6 pages, 7 figures, uses espcrc2.sty. Talk at the International
Symposium on Very High Energy Cosmic Ray Interactions, Paris, France,
September 2008 | Nucl.Phys.Proc.Suppl.196:44-49,2009 | 10.1016/j.nuclphysbps.2009.09.007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a short review of some RHIC results that have been most important for
the small x physics community. We discuss saturation effects in deuteron-gold
collisions, particle production in gold-gold collisions and some effects of the
large "glasma" field configurations in the early stages of the collision.
| [
{
"created": "Tue, 3 Feb 2009 09:41:37 GMT",
"version": "v1"
}
] | 2009-12-08 | [
[
"Lappi",
"T.",
""
]
] | This is a short review of some RHIC results that have been most important for the small x physics community. We discuss saturation effects in deuteron-gold collisions, particle production in gold-gold collisions and some effects of the large "glasma" field configurations in the early stages of the collision. |
hep-ph/9705353 | Rahul Basu | Rahul Basu (The Institute of Mathematical Sciences, Chennai (Madras),
India) | HERA Physics - an overview of experimental and theoretical results | Latex, 21 pages, with postscript figures (included), presented at the
XII DAE Symposium on High Energy Physics, 26 Dec 1996 -- 1 Jan 1997 at
Guwahati, India} | null | null | IMSc-96/05/16 | hep-ph | null | In this talk I review the low x QCD experimental results from HERA and their
theoretical underpinnings. In particular, I discuss the structure function
$F_2$, large rapidity gap events, pomeron structure functions and $J/\psi$
production.
| [
{
"created": "Mon, 19 May 1997 11:58:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Basu",
"Rahul",
"",
"The Institute of Mathematical Sciences, Chennai"
]
] | In this talk I review the low x QCD experimental results from HERA and their theoretical underpinnings. In particular, I discuss the structure function $F_2$, large rapidity gap events, pomeron structure functions and $J/\psi$ production. |
2205.03877 | Norimi Yokozaki | Jason L. Evans, Tsutomu T. Yanagida, Norimi Yokozaki | W boson mass anomaly and grand unification | 19 pages, 1 figure; references added | null | 10.1016/j.physletb.2022.137306 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that the recently reported shift of the W boson mass can be
easily explained by an $SU(2)_L$ triplet Higgs boson with a zero hypercharge if
it obtains a vacuum expectation value (VEV) of $O(1)$ GeV. Surprisingly, the
addition of a TeV scale complex triplet Higgs boson to the standard model (SM)
leads to a precise unification of the gauge couplings at around $10^{14}$ GeV.
We consider that it is a consequence of $SU(5)$ grand unification and show a
possible potential for the Higgs fields yielding a weak scale complex $SU(2)$
triplet scalar boson. Although it seems the proton decay constraint would doom
such a low-scale unification, we show that the constraint can be avoided by
introducing vector-like fermions which mix with the SM fermions through mass
terms involving the VEV of GUT breaking Higgs field. Importantly, the simplest
viable model only requires the addition of one pair of vector-like fermions
transforming ${\bf 10}$ and $\overline{\bf 10}$.
| [
{
"created": "Sun, 8 May 2022 14:03:47 GMT",
"version": "v1"
},
{
"created": "Wed, 18 May 2022 23:00:59 GMT",
"version": "v2"
}
] | 2022-07-20 | [
[
"Evans",
"Jason L.",
""
],
[
"Yanagida",
"Tsutomu T.",
""
],
[
"Yokozaki",
"Norimi",
""
]
] | It is known that the recently reported shift of the W boson mass can be easily explained by an $SU(2)_L$ triplet Higgs boson with a zero hypercharge if it obtains a vacuum expectation value (VEV) of $O(1)$ GeV. Surprisingly, the addition of a TeV scale complex triplet Higgs boson to the standard model (SM) leads to a precise unification of the gauge couplings at around $10^{14}$ GeV. We consider that it is a consequence of $SU(5)$ grand unification and show a possible potential for the Higgs fields yielding a weak scale complex $SU(2)$ triplet scalar boson. Although it seems the proton decay constraint would doom such a low-scale unification, we show that the constraint can be avoided by introducing vector-like fermions which mix with the SM fermions through mass terms involving the VEV of GUT breaking Higgs field. Importantly, the simplest viable model only requires the addition of one pair of vector-like fermions transforming ${\bf 10}$ and $\overline{\bf 10}$. |
hep-ph/0203080 | Elena Perazzi | Z. Chacko (UC Berkeley and LBNL), E.Katz (Washington Univ.) and
E.Perazzi (LBNL) | Yukawa Deflected Gauge Mediation in Four Dimensions | 11 pages, 1figure | Phys.Rev. D66 (2002) 095012 | 10.1103/PhysRevD.66.095012 | UW/PT-02-04, LBNL-49279 | hep-ph | null | We construct a four dimensional realization of a higher dimensional model,
Yukawa deflected gauge mediation, in which supersymmetry breaking is
communicated to the visible sector through both gauge and Yukawa interactions.
The reduction to four dimensions is achieved by `deconstructing' or
`latticizing' the extra dimension. Three sites (gauge groups) are sufficient to
reproduce the spectrum of the higher dimensional model. The characteristic
features of Yukawa deflected gauge mediation, in particular, alignment of
squarks and quarks, and a natural solution to the mu problem, carry over to the
deconstructed version of the model. We comment on the implications of our
results for a solution of the mu problem in the context of deconstructed
gaugino mediation.
| [
{
"created": "Thu, 7 Mar 2002 23:15:19 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Chacko",
"Z.",
"",
"UC Berkeley and LBNL"
],
[
"Katz",
"E.",
"",
"Washington Univ."
],
[
"Perazzi",
"E.",
"",
"LBNL"
]
] | We construct a four dimensional realization of a higher dimensional model, Yukawa deflected gauge mediation, in which supersymmetry breaking is communicated to the visible sector through both gauge and Yukawa interactions. The reduction to four dimensions is achieved by `deconstructing' or `latticizing' the extra dimension. Three sites (gauge groups) are sufficient to reproduce the spectrum of the higher dimensional model. The characteristic features of Yukawa deflected gauge mediation, in particular, alignment of squarks and quarks, and a natural solution to the mu problem, carry over to the deconstructed version of the model. We comment on the implications of our results for a solution of the mu problem in the context of deconstructed gaugino mediation. |
1904.04517 | Xu-Dong Huang | Xu-Dong Huang, Xing-Gang Wu, Jun Zeng, Qing Yu and Jian-Ming Shen | The $\Upsilon(1S)$ leptonic decay using the principle of maximum
conformality | 6 pages, 4 figures | Eur. Phys. J. C 79, 650 (2019) | 10.1140/epjc/s10052-019-7158-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper, we study the $\Upsilon(1S)$ leptonic decay width
$\Gamma(\Upsilon(1S)\to \ell^+\ell^-)$ by using the principle of maximum
conformality (PMC) scale-setting approach. The PMC adopts the renormalization
group equation to set the correct momentum flow of the process, whose value is
independent to the choice of the renormalization scale and its prediction thus
avoids the conventional renormalization scale ambiguities. Using the known
next-to-next-to-next-to-leading order perturbative series together with the PMC
single scale-setting approach, we do obtain a renormalization scale independent
decay width, $\Gamma_{\Upsilon(1S) \to e^+ e^-} = 1.262^{+0.195}_{-0.175}$ keV,
where the error is squared average of those from
$\alpha_s(M_{Z})=0.1181\pm0.0011$, $m_b=4.93\pm0.03$ GeV and the choices of
factorization scales within $\pm 10\%$ of their central values. To compare with
the result under conventional scale-setting approach, this decay width agrees
with the experimental value within errors, indicating the importance of a
proper scale-setting approach.
| [
{
"created": "Tue, 9 Apr 2019 08:17:47 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2019 05:08:33 GMT",
"version": "v2"
}
] | 2019-08-13 | [
[
"Huang",
"Xu-Dong",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Zeng",
"Jun",
""
],
[
"Yu",
"Qing",
""
],
[
"Shen",
"Jian-Ming",
""
]
] | In the paper, we study the $\Upsilon(1S)$ leptonic decay width $\Gamma(\Upsilon(1S)\to \ell^+\ell^-)$ by using the principle of maximum conformality (PMC) scale-setting approach. The PMC adopts the renormalization group equation to set the correct momentum flow of the process, whose value is independent to the choice of the renormalization scale and its prediction thus avoids the conventional renormalization scale ambiguities. Using the known next-to-next-to-next-to-leading order perturbative series together with the PMC single scale-setting approach, we do obtain a renormalization scale independent decay width, $\Gamma_{\Upsilon(1S) \to e^+ e^-} = 1.262^{+0.195}_{-0.175}$ keV, where the error is squared average of those from $\alpha_s(M_{Z})=0.1181\pm0.0011$, $m_b=4.93\pm0.03$ GeV and the choices of factorization scales within $\pm 10\%$ of their central values. To compare with the result under conventional scale-setting approach, this decay width agrees with the experimental value within errors, indicating the importance of a proper scale-setting approach. |
2008.00360 | Oleksandr Sobol Dr. | A. Boyarsky, V. Cheianov, O. Ruchayskiy, and O. Sobol | Equilibration of the chiral asymmetry due to finite electron mass in
electron-positron plasma | 43 pages, 20 figures | Phys. Rev. D 103, 013003 (2021) | 10.1103/PhysRevD.103.013003 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the rate of collisional decay of the axial charge in an
ultrarelativistic electron-positron plasma, also known as the chirality
flipping rate. We find that contrary to the existing estimates, the chirality
flipping rate appears already in the first order in the fine-structure constant
$\alpha$ and is therefore orders of magnitude greater than previously believed.
The main channels for the rapid relaxation of the axial charge are the
collinear emission of a weakly damped photon and the Compton scattering. The
latter contributes to the $\mathcal{O}(\alpha)$ result because of the infrared
divergence in its cross section, which is regularized on the soft scale $\sim
eT$ due to the thermal corrections. Our results are important for the
description of the early Universe processes (such as leptogenesis or
magnetogenesis) that affect differently left- and right-chiral fermions of the
Standard Model, as discussed in more details in the companion Letter.
| [
{
"created": "Sat, 1 Aug 2020 23:28:36 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jan 2021 18:08:33 GMT",
"version": "v2"
}
] | 2021-01-20 | [
[
"Boyarsky",
"A.",
""
],
[
"Cheianov",
"V.",
""
],
[
"Ruchayskiy",
"O.",
""
],
[
"Sobol",
"O.",
""
]
] | We calculate the rate of collisional decay of the axial charge in an ultrarelativistic electron-positron plasma, also known as the chirality flipping rate. We find that contrary to the existing estimates, the chirality flipping rate appears already in the first order in the fine-structure constant $\alpha$ and is therefore orders of magnitude greater than previously believed. The main channels for the rapid relaxation of the axial charge are the collinear emission of a weakly damped photon and the Compton scattering. The latter contributes to the $\mathcal{O}(\alpha)$ result because of the infrared divergence in its cross section, which is regularized on the soft scale $\sim eT$ due to the thermal corrections. Our results are important for the description of the early Universe processes (such as leptogenesis or magnetogenesis) that affect differently left- and right-chiral fermions of the Standard Model, as discussed in more details in the companion Letter. |
1311.2399 | Muneto Nitta | Michikazu Kobayashi, Eiji Nakano, Muneto Nitta | Color Magnetism in Non-Abelian Vortex Matter | 7 pages, no figures, published version | JHEP 1406,130:2014 | 10.1007/JHEP06(2014)130 | null | hep-ph cond-mat.supr-con hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose color magnetism as a generalization of the ordinary Heisenberg
(anti-)ferro magnets on a triangular lattice. Vortex matter consisting of an
Abrikosov lattice of non-Abelian vortices with color magnetic fluxes shows a
color ferro or anti-ferro magnetism, depending on the interaction among the
vortex sites. A prime example is a non-Abelian vortex lattice in rotating dense
quark matter, showing a color ferromagnetism. We show that the low-energy
effective theory for the vortex lattice system in the color ferromagnetic phase
is described by a 3+1 dimensional $CP^{N-1}$ nonlinear sigma model with
spatially anisotropic couplings. We identify gapless excitations independent
from Tkachenko modes as color magnons, that is, Nambu-Goldstone modes
propagating in the vortex lattice with an anisotropic linear dispersion
relation $\omega_p^2 = c_{xy}^2(p_x^2+p_y^2) + c_z^2 p_z^2$. We calculate the
transition temperature between the ordered and disordered phases, and apply it
to dense quark matter. We also identify the order parameter spaces for color
anti-ferromagnets.
| [
{
"created": "Mon, 11 Nov 2013 10:06:43 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jun 2014 15:54:09 GMT",
"version": "v2"
}
] | 2014-06-30 | [
[
"Kobayashi",
"Michikazu",
""
],
[
"Nakano",
"Eiji",
""
],
[
"Nitta",
"Muneto",
""
]
] | We propose color magnetism as a generalization of the ordinary Heisenberg (anti-)ferro magnets on a triangular lattice. Vortex matter consisting of an Abrikosov lattice of non-Abelian vortices with color magnetic fluxes shows a color ferro or anti-ferro magnetism, depending on the interaction among the vortex sites. A prime example is a non-Abelian vortex lattice in rotating dense quark matter, showing a color ferromagnetism. We show that the low-energy effective theory for the vortex lattice system in the color ferromagnetic phase is described by a 3+1 dimensional $CP^{N-1}$ nonlinear sigma model with spatially anisotropic couplings. We identify gapless excitations independent from Tkachenko modes as color magnons, that is, Nambu-Goldstone modes propagating in the vortex lattice with an anisotropic linear dispersion relation $\omega_p^2 = c_{xy}^2(p_x^2+p_y^2) + c_z^2 p_z^2$. We calculate the transition temperature between the ordered and disordered phases, and apply it to dense quark matter. We also identify the order parameter spaces for color anti-ferromagnets. |
hep-ph/0412261 | Stephen Godfrey | Stephen Godfrey (Carleton) and Shou-hua Zhu (Carleton & Peking) | Study of V_LV_L to t tbar at the ILC Including O(alpha_s) QCD
Corrections | 8 pages, 8 figures, Minor changes in wording. uses Revtex4 | Phys.Rev. D72 (2005) 074011 | 10.1103/PhysRevD.72.074011 | null | hep-ph | null | In the event that the Higgs mass is large or that the electroweak
interactions are strongly interacting at high energy, top quark couplings to
longitudinal components of the weak gauge bosons could offer important clues to
the underlying dynamics. It has been suggested that precision measurements of
W_L W_L to t tbar and Z_L Z_L to t tbar might provide hints of new physics. In
this paper we present results of O(alpha_s) QCD corrections to V_LV_L to t tbar
scattering at the ILC. We find that corrections to cross sections can be as
large as 30% and must be accounted for in any precision measurement of VV to t
tbar.
| [
{
"created": "Fri, 17 Dec 2004 20:00:22 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 2005 19:33:09 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Sep 2005 01:52:35 GMT",
"version": "v3"
}
] | 2016-09-06 | [
[
"Godfrey",
"Stephen",
"",
"Carleton"
],
[
"Zhu",
"Shou-hua",
"",
"Carleton & Peking"
]
] | In the event that the Higgs mass is large or that the electroweak interactions are strongly interacting at high energy, top quark couplings to longitudinal components of the weak gauge bosons could offer important clues to the underlying dynamics. It has been suggested that precision measurements of W_L W_L to t tbar and Z_L Z_L to t tbar might provide hints of new physics. In this paper we present results of O(alpha_s) QCD corrections to V_LV_L to t tbar scattering at the ILC. We find that corrections to cross sections can be as large as 30% and must be accounted for in any precision measurement of VV to t tbar. |
2009.10319 | Jiaxing Zhao | Jiaxing Zhao, Shuzhe Shi, and Pengfei Zhuang | Fully-heavy tetraquarks in strongly interacting medium | 13 pages, 5 figures | Phys. Rev. D. 102.114001(2020) | 10.1103/PhysRevD.102.114001 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of fully-heavy tetraquarks at finite temperature and
their production in high-energy nuclear collisions. We obtain the masses and
wave functions of the exotic hadron states $cc\bar c\bar c$ and $bb\bar b\bar
b$ by solving the four-body Schr\"odinger equation in vacuum and strongly
interacting matter. In vacuum, the tetraquarks are above the corresponding
meson-meson mass threshold, and the newly observed exotic state $X(6900)$ might
be a $cc\bar c\bar c$ state with quantum number $J^{PC}=0^{++}$ or $1^{+-}$. In
hot medium, the temperature dependence of the tetraquark masses and the
dissociation temperatures are calculated. Taking the wave function at finite
temperature, we construct the Wigner function for the tetraquark states and
calculate, with coalescence mechanism, the production yield and transverse
momentum distribution of $cc\bar c\bar c$ in heavy-ion collisions at LHC
energy. In comparison with nucleon-nucleon collisions, the yield per binary
collision is significantly enhanced.
| [
{
"created": "Tue, 22 Sep 2020 04:57:01 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Dec 2020 02:05:33 GMT",
"version": "v2"
}
] | 2020-12-04 | [
[
"Zhao",
"Jiaxing",
""
],
[
"Shi",
"Shuzhe",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | We study the properties of fully-heavy tetraquarks at finite temperature and their production in high-energy nuclear collisions. We obtain the masses and wave functions of the exotic hadron states $cc\bar c\bar c$ and $bb\bar b\bar b$ by solving the four-body Schr\"odinger equation in vacuum and strongly interacting matter. In vacuum, the tetraquarks are above the corresponding meson-meson mass threshold, and the newly observed exotic state $X(6900)$ might be a $cc\bar c\bar c$ state with quantum number $J^{PC}=0^{++}$ or $1^{+-}$. In hot medium, the temperature dependence of the tetraquark masses and the dissociation temperatures are calculated. Taking the wave function at finite temperature, we construct the Wigner function for the tetraquark states and calculate, with coalescence mechanism, the production yield and transverse momentum distribution of $cc\bar c\bar c$ in heavy-ion collisions at LHC energy. In comparison with nucleon-nucleon collisions, the yield per binary collision is significantly enhanced. |
0809.4503 | Jacobus Verbaarschot | K. Splittorff and J.J.M. Verbaarschot | Lessons from Random Matrix Theory for QCD at Finite Density | Invited talk at "Continuous Advances in QCD 2008", Minneapolis, May
2008; 14 pages, 7 figures | null | 10.1142/9789812838667_0014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this lecture we discuss various aspects of QCD at nonzero chemical
potential, including its phase diagram and the Dirac spectrum, and summarize
what chiral random matrix theory has contributed to this subject. To illustrate
the importance of the phase of the fermion determinant, we particularly
highlight the differences between QCD and phase quenched QCD.
| [
{
"created": "Thu, 25 Sep 2008 21:09:43 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Splittorff",
"K.",
""
],
[
"Verbaarschot",
"J. J. M.",
""
]
] | In this lecture we discuss various aspects of QCD at nonzero chemical potential, including its phase diagram and the Dirac spectrum, and summarize what chiral random matrix theory has contributed to this subject. To illustrate the importance of the phase of the fermion determinant, we particularly highlight the differences between QCD and phase quenched QCD. |
0712.2933 | Peihong Gu | Pei-Hong Gu, Utpal Sarkar | Radiative Neutrino Mass, Dark Matter and Leptogenesis | 4 pages, 3 figures. Revised version with improved model. Accepted by
PRD | Phys.Rev.D77:105031,2008 | 10.1103/PhysRevD.77.105031 | null | hep-ph | null | We propose an extension of the standard model, in which neutrinos are Dirac
particles and their tiny masses originate from a one-loop radiative diagram.
The new fields required by the neutrino mass-generation also accommodate the
explanation for the matter-antimatter asymmetry and dark matter in the
universe.
| [
{
"created": "Tue, 18 Dec 2007 11:35:17 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2008 13:20:30 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gu",
"Pei-Hong",
""
],
[
"Sarkar",
"Utpal",
""
]
] | We propose an extension of the standard model, in which neutrinos are Dirac particles and their tiny masses originate from a one-loop radiative diagram. The new fields required by the neutrino mass-generation also accommodate the explanation for the matter-antimatter asymmetry and dark matter in the universe. |
1905.07591 | Kazem Azizi | S. S. Agaev, K. Azizi, H. Sundu | Double-heavy axial-vector tetraquark $T_{bc;\bar{u}\bar{d}}^{0}$ | 11 Pages, 3 Figures and 4 Tables | null | 10.1016/j.nuclphysb.2019.114890 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass and coupling of the axial-vector tetraquark $T_{bc;\bar{u}\bar{d}
}^{0}$ (in a short form $T_{bc}^{0}$) are calculated by means of the QCD
two-point sum rule method. In computations we take into account contributions
arising from various quark, gluon and mixed vacuum condensates up to dimension
10. The central value of the mass $m=(7105 \pm 155)~\mathrm{ MeV}$ lies below
the thresholds for the strong and electromagnetic decays of $T_{bc}^{0}$ state,
and hence it transforms to conventional mesons only through the weak decays. In
the case of $m=7260~\mathrm{MeV}$ the tetraquark $T_{bc}^{0}$ becomes the
strong- and electromagnetic-interaction unstable particle. In the first case,
we find the full width and mean lifetime of $ T_{bc}^{0}$ using its dominant
semileptonic decays $T_{bc}^{0}\to T_{cc;\bar{ u}\bar{d}}^{+}l\overline{\nu
}_{l}$ ($l=e,\ \mu, \tau$), where the final-state tetraquark is a scalar state.
We compute also partial widths of the nonleptonic weak decays $T_{bc}^{0}\to
T_{cc;\bar{u}\bar{d} }^{+}\pi^{-}(K^{-}, D^{-}, D_{s}^{-})$, and take into
account their effects on the full width of $T_{bc}^{0}$. In the context of the
second scenario we calculate partial widths of $S$-wave strong decays
$T_{bc}^{0}\to B^{\ast -}D^{+}$ and $T_{bc}^{0}\to \overline{B}^{\ast 0}D^{0}$,
and using these channels evaluate the full width of $T_{bc}^{0}$. Predictions
for $\Gamma_{ \mathrm{full}} =(3.98\pm 0.51)\times 10^{-10}~\mathrm{MeV}$ and
mean lifetime $\tau=1.65_{-0.18}^{+0.25}~\mathrm{ps}$ of $T_{bc}^{0}$ obtained
in the context of the first option, as well as the full width $\Gamma_{\mathrm{
full}}=(63.5\pm 8.9)~\mathrm{MeV}$ extracted in the second scenario may be
useful for experimental and theoretical exploration of double-heavy exotic
mesons.
| [
{
"created": "Sat, 18 May 2019 13:48:33 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2019 06:34:18 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Jul 2019 11:44:03 GMT",
"version": "v3"
},
{
"created": "Mon, 26 Aug 2019 18:45:26 GMT",
"version": "v4"
}
] | 2020-01-29 | [
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] | The mass and coupling of the axial-vector tetraquark $T_{bc;\bar{u}\bar{d} }^{0}$ (in a short form $T_{bc}^{0}$) are calculated by means of the QCD two-point sum rule method. In computations we take into account contributions arising from various quark, gluon and mixed vacuum condensates up to dimension 10. The central value of the mass $m=(7105 \pm 155)~\mathrm{ MeV}$ lies below the thresholds for the strong and electromagnetic decays of $T_{bc}^{0}$ state, and hence it transforms to conventional mesons only through the weak decays. In the case of $m=7260~\mathrm{MeV}$ the tetraquark $T_{bc}^{0}$ becomes the strong- and electromagnetic-interaction unstable particle. In the first case, we find the full width and mean lifetime of $ T_{bc}^{0}$ using its dominant semileptonic decays $T_{bc}^{0}\to T_{cc;\bar{ u}\bar{d}}^{+}l\overline{\nu }_{l}$ ($l=e,\ \mu, \tau$), where the final-state tetraquark is a scalar state. We compute also partial widths of the nonleptonic weak decays $T_{bc}^{0}\to T_{cc;\bar{u}\bar{d} }^{+}\pi^{-}(K^{-}, D^{-}, D_{s}^{-})$, and take into account their effects on the full width of $T_{bc}^{0}$. In the context of the second scenario we calculate partial widths of $S$-wave strong decays $T_{bc}^{0}\to B^{\ast -}D^{+}$ and $T_{bc}^{0}\to \overline{B}^{\ast 0}D^{0}$, and using these channels evaluate the full width of $T_{bc}^{0}$. Predictions for $\Gamma_{ \mathrm{full}} =(3.98\pm 0.51)\times 10^{-10}~\mathrm{MeV}$ and mean lifetime $\tau=1.65_{-0.18}^{+0.25}~\mathrm{ps}$ of $T_{bc}^{0}$ obtained in the context of the first option, as well as the full width $\Gamma_{\mathrm{ full}}=(63.5\pm 8.9)~\mathrm{MeV}$ extracted in the second scenario may be useful for experimental and theoretical exploration of double-heavy exotic mesons. |
hep-ph/0106093 | Mu-Chun Chen | Mu-Chun Chen and K.T. Mahanthappa | CP Violation in a Supersymmetric SO(10) x U(2)_{F} Model | RevTeX4; 7 pages; typos corrected; clarification remarks added; more
references added. To appear in Physical Review D | Phys.Rev.D65:053010,2002 | 10.1103/PhysRevD.65.053010 | COLO-HEP-466 | hep-ph | null | A model based on SUSY SO(10) combined with U(2) family symmetry constructed
recently by the authors is generalized to include phases in the mass matrices
leading to CP violation. In contrast with the commonly used effective operator
approach, $\bar{126}$-dimensional Higgs fields are utilized to construct the
Yukawa sector. R-parity symmetry is thus preserved at low energies. The
symmetric mass textures arising from the left-right symmetry breaking chain of
SO(10) give rise to very good predictions for quark and lepton masses and
mixings. The prediction for $\sin 2\beta$ agrees with the average of current
bounds from BaBar and Belle. In the neutrino sector, our predictions are in
good agreement with results from atmospheric neutrino experiments. Our model
favors both the LOW and QVO solutions to the solar neutrino anomaly; the matrix
element for neutrinoless double beta decay is highly suppressed. The leptonic
analog of the Jarlskog invariant, $J_{CP}^{l}$, is predicted to be of
$O(10^{-2})$.
| [
{
"created": "Fri, 8 Jun 2001 19:03:11 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2001 22:45:29 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Nov 2001 21:06:02 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Chen",
"Mu-Chun",
""
],
[
"Mahanthappa",
"K. T.",
""
]
] | A model based on SUSY SO(10) combined with U(2) family symmetry constructed recently by the authors is generalized to include phases in the mass matrices leading to CP violation. In contrast with the commonly used effective operator approach, $\bar{126}$-dimensional Higgs fields are utilized to construct the Yukawa sector. R-parity symmetry is thus preserved at low energies. The symmetric mass textures arising from the left-right symmetry breaking chain of SO(10) give rise to very good predictions for quark and lepton masses and mixings. The prediction for $\sin 2\beta$ agrees with the average of current bounds from BaBar and Belle. In the neutrino sector, our predictions are in good agreement with results from atmospheric neutrino experiments. Our model favors both the LOW and QVO solutions to the solar neutrino anomaly; the matrix element for neutrinoless double beta decay is highly suppressed. The leptonic analog of the Jarlskog invariant, $J_{CP}^{l}$, is predicted to be of $O(10^{-2})$. |
2306.06395 | Zhongyu Wang | Zhong-Yu Wang, Yu-Wen Peng, Jing-Yu Yi, W. C. Luo, and C. W. Xiao | Are the $a_{0}(1710)$ or $a_{0}(1817)$ resonances in the $D_{s}^{+}
\rightarrow K_{S}^{0}K^{+}\pi^{0}$ decay? | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The BESIII Collaboration claimed that a new $a_{0}(1817)$ resonance was found
in the recent results of the $D_{s}^{+} \rightarrow K_{S}^{0}K^{+}\pi^{0}$
decay. For this decay process, we perform a unitary amplitude to analyze the
contributions of the states $a_{0}(980)^{+}$ and $a_{0}(1710)^{+}$ with the
final state interactions. Considering the Cabibbo-favored external and internal
$W$-emission mechanisms at the quark level, and the contributions of the
resonances $a_{0}(980)^{+}$, $a_{0}(1710)^{+}$ in the $S$-wave and
$\bar{K}^{*}(892)^{0}$, ${K}^{*}(892)^{+}$ in the $P$-wave, the recent
experimental data of the $K_{S}^{0}K^{+}$ invariant mass spectrum from the
BESIII Collaboration can be described well. In our results, the states
$a_{0}(980)$ and $a_{0}(1710)$ are dynamically generated from the final state
interactions of $K\bar{K}$ and $K^{*}\bar{K}^{*}$, respectively, which support
the molecular nature for them. Moreover, some obtained branching fractions are
in agreement with the experimental measurements.
| [
{
"created": "Sat, 10 Jun 2023 09:43:51 GMT",
"version": "v1"
}
] | 2023-06-13 | [
[
"Wang",
"Zhong-Yu",
""
],
[
"Peng",
"Yu-Wen",
""
],
[
"Yi",
"Jing-Yu",
""
],
[
"Luo",
"W. C.",
""
],
[
"Xiao",
"C. W.",
""
]
] | The BESIII Collaboration claimed that a new $a_{0}(1817)$ resonance was found in the recent results of the $D_{s}^{+} \rightarrow K_{S}^{0}K^{+}\pi^{0}$ decay. For this decay process, we perform a unitary amplitude to analyze the contributions of the states $a_{0}(980)^{+}$ and $a_{0}(1710)^{+}$ with the final state interactions. Considering the Cabibbo-favored external and internal $W$-emission mechanisms at the quark level, and the contributions of the resonances $a_{0}(980)^{+}$, $a_{0}(1710)^{+}$ in the $S$-wave and $\bar{K}^{*}(892)^{0}$, ${K}^{*}(892)^{+}$ in the $P$-wave, the recent experimental data of the $K_{S}^{0}K^{+}$ invariant mass spectrum from the BESIII Collaboration can be described well. In our results, the states $a_{0}(980)$ and $a_{0}(1710)$ are dynamically generated from the final state interactions of $K\bar{K}$ and $K^{*}\bar{K}^{*}$, respectively, which support the molecular nature for them. Moreover, some obtained branching fractions are in agreement with the experimental measurements. |
1302.5874 | Xin-Nian Wang | Xin-Nian Wang (CCNU/LBNL) and Yan Zhu (U. Bielefeld) | Medium Modification of \gamma-jets in High-energy Heavy-ion Collisions | 4 pages, 5 figures final version published | null | 10.1103/PhysRevLett.111.062301 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Medium modification of \gamma-tagged jets in high-energy heavy-ion collisions
is investigated within a Linearized Boltzmann Transport model for jet
propagation that includes both elastic parton scattering and induced gluon
emission. Inclusion of recoiled medium partons in the reconstruction of
partonic jets is found to significantly reduce the net jet energy loss.
Experimental data on \gamma-jet asymmetry and survival rate in Pb + Pb
collisions at \sqrt{s}=2.76 TeV can be reproduced. Medium modifications of
reconstructed jet fragmentation function, transverse profile and energy flow
outside the jet-cone are found to be sizable especially for \gamma-tagged jets
with small values of x=p_T^{jet}/p_T^\gamma.
| [
{
"created": "Sun, 24 Feb 2013 05:37:24 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Aug 2013 07:43:49 GMT",
"version": "v2"
}
] | 2013-08-20 | [
[
"Wang",
"Xin-Nian",
"",
"CCNU/LBNL"
],
[
"Zhu",
"Yan",
"",
"U. Bielefeld"
]
] | Medium modification of \gamma-tagged jets in high-energy heavy-ion collisions is investigated within a Linearized Boltzmann Transport model for jet propagation that includes both elastic parton scattering and induced gluon emission. Inclusion of recoiled medium partons in the reconstruction of partonic jets is found to significantly reduce the net jet energy loss. Experimental data on \gamma-jet asymmetry and survival rate in Pb + Pb collisions at \sqrt{s}=2.76 TeV can be reproduced. Medium modifications of reconstructed jet fragmentation function, transverse profile and energy flow outside the jet-cone are found to be sizable especially for \gamma-tagged jets with small values of x=p_T^{jet}/p_T^\gamma. |
0710.1508 | Mustafa Savci | T. M. Aliev, K. Azizi, M. Savci | Analysis of rare (B -> K_0*(1430) l^+ l^- decay) within QCD sum rules | 13 pages, 1 figure | Phys.Rev.D76:074017,2007 | 10.1103/PhysRevD.76.074017 | metu-phys-hep-07-19 | hep-ph | null | Form factors of rare (B -> K_0*(1430) l^+ l^-$ decay) decay are calculated
within three-point QCD sum rules, with (K_0* (1430)) being the p-wave scalar
meson. The branching ratios are estimated when only short, as well as short and
long distance effects, are taken into account.It is obtained that the (B ->
K_0*(1430) l^+ l^- (l=e,mu)) decay is measurable at LHC. Measurement of these
branching ratios for the semileptonic rare (B -> K_0*(1430) l^+ l^-$ decay) can
give valuable information about the nature of scalar meson (K_0* (1430)).
| [
{
"created": "Mon, 8 Oct 2007 10:50:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Aliev",
"T. M.",
""
],
[
"Azizi",
"K.",
""
],
[
"Savci",
"M.",
""
]
] | Form factors of rare (B -> K_0*(1430) l^+ l^-$ decay) decay are calculated within three-point QCD sum rules, with (K_0* (1430)) being the p-wave scalar meson. The branching ratios are estimated when only short, as well as short and long distance effects, are taken into account.It is obtained that the (B -> K_0*(1430) l^+ l^- (l=e,mu)) decay is measurable at LHC. Measurement of these branching ratios for the semileptonic rare (B -> K_0*(1430) l^+ l^-$ decay) can give valuable information about the nature of scalar meson (K_0* (1430)). |
0805.0768 | Joao Pacheco B. C. de Melo Dr. | B. El-Bennich (LPNHE, France and ANL, USA), J. P. B. C. de Melo (LFTC,
Universidade Cruzeiro do Sul and IFT, UNESP, Brazil), B. Loiseau (LPNHE,
France), J.-P.Dedonder (LPNHE, France) and T. Frederico (ITA, CTA, Brazil) | Modeling electromagnetic form factors of light and heavy pseudoscalar
mesons | 6 pages, 4 figures, use revtex4. Figure 2 and references are
corrected. Acknoledgments are added | Braz.J.Phys.38:465-471,2008 | 10.1590/S0103-97332008000400016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electromagnetic form factors of light and heavy pseudoscalar mesons are
calculated within two covariant constituent-quark models, a light-front and a
dispersion relation approach. We investigate the details and physical origins
of the model dependence of various hadronic observables: the weak decay
constant, the charge radius and the elastic electromagnetic form factor.
| [
{
"created": "Tue, 6 May 2008 19:56:29 GMT",
"version": "v1"
},
{
"created": "Mon, 12 May 2008 14:54:49 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Oct 2008 18:02:54 GMT",
"version": "v3"
}
] | 2011-08-31 | [
[
"El-Bennich",
"B.",
"",
"LPNHE, France and ANL, USA"
],
[
"de Melo",
"J. P. B. C.",
"",
"LFTC,\n Universidade Cruzeiro do Sul and IFT, UNESP, Brazil"
],
[
"Loiseau",
"B.",
"",
"LPNHE,\n France"
],
[
"Dedonder",
"J. -P.",
"",
"LPNHE, Fra... | The electromagnetic form factors of light and heavy pseudoscalar mesons are calculated within two covariant constituent-quark models, a light-front and a dispersion relation approach. We investigate the details and physical origins of the model dependence of various hadronic observables: the weak decay constant, the charge radius and the elastic electromagnetic form factor. |
1003.1182 | Pengzhi Huang | Peng-Zhi Huang, Liang Zhang, Shi-Lin Zhu | Strong and Electromagnetic Decays of The $D$-wave Heavy Mesons | 20 pages, 13 figures | Phys.Rev.D81:094025,2010 | 10.1103/PhysRevD.81.094025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the $\pi$, $\rho$, $\omega$, and $\gamma$ coupling constants
between the heavy meson doublets $(1^-,2^-)$ and (0^-,1^-)/(0^+,1^+) within the
framework of the light-cone QCD sum rule at the leading order of heavy quark
effective theory. Most of the sum rules are stable with the variations of the
Borel parameter and the continuum threshold. Then we calculate the strong and
electromagnetic decay widths of the $(1^-,2^-)$ D-wave heavy mesons. Their
total widths are around several tens of MeV, which is helpful in the future
experimental search.
| [
{
"created": "Fri, 5 Mar 2010 04:17:25 GMT",
"version": "v1"
}
] | 2010-06-01 | [
[
"Huang",
"Peng-Zhi",
""
],
[
"Zhang",
"Liang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We calculate the $\pi$, $\rho$, $\omega$, and $\gamma$ coupling constants between the heavy meson doublets $(1^-,2^-)$ and (0^-,1^-)/(0^+,1^+) within the framework of the light-cone QCD sum rule at the leading order of heavy quark effective theory. Most of the sum rules are stable with the variations of the Borel parameter and the continuum threshold. Then we calculate the strong and electromagnetic decay widths of the $(1^-,2^-)$ D-wave heavy mesons. Their total widths are around several tens of MeV, which is helpful in the future experimental search. |
2312.02278 | Timothy Hobbs | Brandon Kriesten and T. J. Hobbs | Learning PDFs through Interpretable Latent Representations in Mellin
Space | 22 pages, 11 figures; updated link to public code,
https://github.com/ML4HEP-Theory/PDFDecoder | null | null | ANL-186490 | hep-ph hep-lat nucl-th | http://creativecommons.org/licenses/by/4.0/ | Representing the parton distribution functions (PDFs) of the proton and other
hadrons through flexible, high-fidelity parametrizations has been a
long-standing goal of particle physics phenomenology. This is particularly true
since the chosen parametrization methodology can play an influential role in
the ultimate PDF uncertainties as extracted in QCD global analyses; these, in
turn, are often determinative of the reach of experiments at the LHC and other
facilities to non-standard physics, including at large $x$, where
parametrization effects can be significant. In this study, we explore a series
of encoder-decoder machine-learning (ML) models with various neural-network
topologies as efficient means of reconstructing PDFs from meaningful
information stored in an interpretable latent space. Given recent effort to
pioneer synergies between QCD analyses and lattice-gauge calculations, we
formulate a latent representation based on the behavior of PDFs in Mellin
space, i.e., their integrated moments, and test the ability of various models
to decode PDFs from this information faithfully. We introduce a numerical
package, $\texttt{PDFdecoder}$, which implements several encoder-decoder models
to reconstruct PDFs with high fidelity and use this tool to explore strengths
and pitfalls of neural-network approaches to PDF parametrization. We
additionally dissect patterns of learned correlations between encoded Mellin
moments and reconstructed PDFs which suggest opportunities for further
improvements to ML-based approaches to PDF parametrizations and uncertainty
quantification.
| [
{
"created": "Mon, 4 Dec 2023 19:00:23 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 2024 14:46:15 GMT",
"version": "v2"
}
] | 2024-06-21 | [
[
"Kriesten",
"Brandon",
""
],
[
"Hobbs",
"T. J.",
""
]
] | Representing the parton distribution functions (PDFs) of the proton and other hadrons through flexible, high-fidelity parametrizations has been a long-standing goal of particle physics phenomenology. This is particularly true since the chosen parametrization methodology can play an influential role in the ultimate PDF uncertainties as extracted in QCD global analyses; these, in turn, are often determinative of the reach of experiments at the LHC and other facilities to non-standard physics, including at large $x$, where parametrization effects can be significant. In this study, we explore a series of encoder-decoder machine-learning (ML) models with various neural-network topologies as efficient means of reconstructing PDFs from meaningful information stored in an interpretable latent space. Given recent effort to pioneer synergies between QCD analyses and lattice-gauge calculations, we formulate a latent representation based on the behavior of PDFs in Mellin space, i.e., their integrated moments, and test the ability of various models to decode PDFs from this information faithfully. We introduce a numerical package, $\texttt{PDFdecoder}$, which implements several encoder-decoder models to reconstruct PDFs with high fidelity and use this tool to explore strengths and pitfalls of neural-network approaches to PDF parametrization. We additionally dissect patterns of learned correlations between encoded Mellin moments and reconstructed PDFs which suggest opportunities for further improvements to ML-based approaches to PDF parametrizations and uncertainty quantification. |
1404.5768 | Vladimir Grichine | V.M. Grichine | Nucleon elastic scattering in quark-diquark representation with springy
Pomeron | 5 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model for elastic scattering of nucleons (and anti-nucleons) based on the
quark-diquark representation of the nucleon with springy Pomeron, providing
increased real part of the scattering amplitude, is developed. The model
predictions are compared with experimental data for the differential elastic
cross-sections of nucleons in the energy range from few GeV up to 7 TeV using
available databases.
| [
{
"created": "Wed, 23 Apr 2014 10:03:40 GMT",
"version": "v1"
}
] | 2014-04-24 | [
[
"Grichine",
"V. M.",
""
]
] | A model for elastic scattering of nucleons (and anti-nucleons) based on the quark-diquark representation of the nucleon with springy Pomeron, providing increased real part of the scattering amplitude, is developed. The model predictions are compared with experimental data for the differential elastic cross-sections of nucleons in the energy range from few GeV up to 7 TeV using available databases. |
0810.4906 | Nita Sinha | Nita Sinha | Determining the Neutral D Mixing Parameters | 5 pages, talk presented at the International Conference on High
Energy Physics, ICHEP08, Philadelphia, 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Evidence for mixing in the neutral D meson system has recently been reported.
Assuming negligible CP violation, non-vanishing width and mass differences
between the two neutral D mass eigenstates has been found. Theoretical
predictions of these are rather difficult, obscuring detection of New Physics
contributions. However, the observation of CP violation in the D system would
be a good signal of New Physics. We briefly describe the formalism that
describes the neutral D decay and mixing, and present a method to determine all
the mixing parameters accurately allowing for arbitrary CP violation.
| [
{
"created": "Mon, 27 Oct 2008 19:16:28 GMT",
"version": "v1"
}
] | 2008-10-28 | [
[
"Sinha",
"Nita",
""
]
] | Evidence for mixing in the neutral D meson system has recently been reported. Assuming negligible CP violation, non-vanishing width and mass differences between the two neutral D mass eigenstates has been found. Theoretical predictions of these are rather difficult, obscuring detection of New Physics contributions. However, the observation of CP violation in the D system would be a good signal of New Physics. We briefly describe the formalism that describes the neutral D decay and mixing, and present a method to determine all the mixing parameters accurately allowing for arbitrary CP violation. |
1903.10486 | Suman Kumbhakar | Ashutosh Kumar Alok, Dinesh Kumar, Suman Kumbhakar, S Uma Sankar | Solutions to $R_D$-$R_{D^*}$ in light of Belle 2019 data | 6 pages, 2 figures, 4 tables, title changed | Nucl. Phys. B 953 (2020) 114957 | 10.1016/j.nuclphysb.2020.114957 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Earlier this year, the Belle collaboration presented their new measurements
of $R_D$ and $R_{D^*}$ using a new method. These measurements are consistent
with the Standard Model predictions, whereas the global averages of the earlier
measurements had a $4.1\sigma$ discrepancy. With the inclusion of the new data
in the global averages, the discrepancy comes down to $3.1\sigma$. In this
work, we study the study the new physics solutions to the $R_D$-$R_{D^*}$
anomaly allowed by the reduction in the discrepancy. Among the four fermion
operators, which arise through a single particle exchange, only the $(V-A)$
operator solution survives. We found three additional solutions with two
dis-similar operators. The branching ratio of $B_c\rightarrow \tau\,\bar{\nu}$
is powerful discriminant between these four allowed solutions.
| [
{
"created": "Mon, 25 Mar 2019 17:32:13 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Aug 2019 05:58:12 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Dec 2019 05:24:57 GMT",
"version": "v3"
}
] | 2020-02-17 | [
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Kumar",
"Dinesh",
""
],
[
"Kumbhakar",
"Suman",
""
],
[
"Sankar",
"S Uma",
""
]
] | Earlier this year, the Belle collaboration presented their new measurements of $R_D$ and $R_{D^*}$ using a new method. These measurements are consistent with the Standard Model predictions, whereas the global averages of the earlier measurements had a $4.1\sigma$ discrepancy. With the inclusion of the new data in the global averages, the discrepancy comes down to $3.1\sigma$. In this work, we study the study the new physics solutions to the $R_D$-$R_{D^*}$ anomaly allowed by the reduction in the discrepancy. Among the four fermion operators, which arise through a single particle exchange, only the $(V-A)$ operator solution survives. We found three additional solutions with two dis-similar operators. The branching ratio of $B_c\rightarrow \tau\,\bar{\nu}$ is powerful discriminant between these four allowed solutions. |
hep-ph/9707248 | Michelangelo Mangano | M.L. Mangano and S. R. Slabospitsky | The Contribution of Bc Mesons to the Search for B->tau nu Decays at LEP | 8 pages, Latex, epsfig, 1 figure | Phys.Lett.B410:299-303,1997 | 10.1016/S0370-2693(97)00953-2 | CERN-TH/97-150 | hep-ph hep-ex | null | We study the contribution of B_c mesons to the search for B->tau nu decays.
We find that at LEP the contributions from B_u and B_c mesons can be
comparable. This observation can have a relevant impact on the extraction of
constraints on new physics (such as charged-Higgs contributions) from current
LEP limits on B->tau nu final states. Inclusion of the B_c contribution can
reduce the current L3 limit on Tan(beta)/M_H from 0.38/GeV (90%CL) down to
0.27/GeV (90%CL).
| [
{
"created": "Fri, 4 Jul 1997 14:45:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mangano",
"M. L.",
""
],
[
"Slabospitsky",
"S. R.",
""
]
] | We study the contribution of B_c mesons to the search for B->tau nu decays. We find that at LEP the contributions from B_u and B_c mesons can be comparable. This observation can have a relevant impact on the extraction of constraints on new physics (such as charged-Higgs contributions) from current LEP limits on B->tau nu final states. Inclusion of the B_c contribution can reduce the current L3 limit on Tan(beta)/M_H from 0.38/GeV (90%CL) down to 0.27/GeV (90%CL). |
hep-ph/9910492 | Gavin Salam | Gavin P. Salam | An introduction to leading and next-to-leading BFKL | 27 pages; presented at the Cracow School of Theoretical Physics,
XXXIX Course, May 1999 | Acta Phys.Polon.B30:3679-3705,1999 | null | Bicocca-FT-99-35 | hep-ph | null | Of late, the field of BFKL physics has been the subject of significant
developments. The calculation of the NLL terms was recently completed, and they
turned out to be very large. Techniques have been proposed to resum these
corrections. These lectures provide an introduction to the BFKL equation and
some of the recent developments, using DGLAP evolution as the starting point.
| [
{
"created": "Tue, 26 Oct 1999 15:58:16 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Salam",
"Gavin P.",
""
]
] | Of late, the field of BFKL physics has been the subject of significant developments. The calculation of the NLL terms was recently completed, and they turned out to be very large. Techniques have been proposed to resum these corrections. These lectures provide an introduction to the BFKL equation and some of the recent developments, using DGLAP evolution as the starting point. |
hep-ph/9909355 | Douglas W. McKay | Loretta M. Johnson, Douglas W. McKay | Revising Neutrino Oscillation Parameter Space With Direct
Flavor-Changing Interactions | 16 pages, 10 figures | Phys.Rev. D61 (2000) 113007 | 10.1103/PhysRevD.61.113007 | null | hep-ph | null | We formulate direct, neutrino flavor-changing interactions in a framework
that fits smoothly with the parameterization of two-and three-state mixing of
massive neutrino states. We show that even small direct interaction strengths
could have important consequences for the interpretation of currently running
and proposed oscillation experiments. The oscillation amplitude and the borders
of the allowed regions in two-and three-flavor mixing parameter space can be
sensitieve to the presence of direct interactions when the transition
probability is small. We use extensively the high sensitivity of the NOMAD
experiment to illustrate potentially large effects from small, direct flavor
violation. In the purely leptonic sector, we find that the clean muon neutrino
and electron neutrino beams from a muon collider could provide the sharpest
tests of direct flavor violation.
| [
{
"created": "Tue, 14 Sep 1999 04:57:18 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Johnson",
"Loretta M.",
""
],
[
"McKay",
"Douglas W.",
""
]
] | We formulate direct, neutrino flavor-changing interactions in a framework that fits smoothly with the parameterization of two-and three-state mixing of massive neutrino states. We show that even small direct interaction strengths could have important consequences for the interpretation of currently running and proposed oscillation experiments. The oscillation amplitude and the borders of the allowed regions in two-and three-flavor mixing parameter space can be sensitieve to the presence of direct interactions when the transition probability is small. We use extensively the high sensitivity of the NOMAD experiment to illustrate potentially large effects from small, direct flavor violation. In the purely leptonic sector, we find that the clean muon neutrino and electron neutrino beams from a muon collider could provide the sharpest tests of direct flavor violation. |
1111.4904 | Francesco Coradeschi | Francesco Bernardini, Francesco Coradeschi and Daniele Dominici | Effective chiral Lagrangians for new vector bosons to O(p^4) order | PDF-LaTeX with 11 figures, 8 .mf files for Feynman diagrams. Uses
feynmf package and h-physrev5 bibliography style | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the SM Higgs boson does not exist, electroweak symmetry breaking may be
realized via a strong interaction with a typical scale Lambda > 1 TeV.
Resonances from the strong sector may help to unitarize WW scattering, which
becomes strong in the absence of an Higgs field, and could be detected at the
LHC. In this paper we describe such a scenario, in the minimal case in which
only one new vector resonance is present, via a chiral SU(2) x SU(2)/SU(2)
lagrangian also including all possible invariant terms up to O(p^4) order
(assuming a parity symmetry in the strong sector). The O(p^4) invariants are
not usually taken into account in similar studies in the literature; however,
they have been shown to be potentially important, at least, to reconcile this
kind of scheme with electroweak precision tests. Here we use the O(p^4)
lagrangian to study the scattering amplitudes for the pi pi sector,
investigating the partial wave unitarity properties of the model and its
cut-off energy scale. We obtain constraints on the parameter space and compare
our result to the one obtained with just the O(p^2) lagrangian, finding that
the contribution of the new operators is indeed significant.
| [
{
"created": "Mon, 21 Nov 2011 15:47:55 GMT",
"version": "v1"
}
] | 2011-11-22 | [
[
"Bernardini",
"Francesco",
""
],
[
"Coradeschi",
"Francesco",
""
],
[
"Dominici",
"Daniele",
""
]
] | If the SM Higgs boson does not exist, electroweak symmetry breaking may be realized via a strong interaction with a typical scale Lambda > 1 TeV. Resonances from the strong sector may help to unitarize WW scattering, which becomes strong in the absence of an Higgs field, and could be detected at the LHC. In this paper we describe such a scenario, in the minimal case in which only one new vector resonance is present, via a chiral SU(2) x SU(2)/SU(2) lagrangian also including all possible invariant terms up to O(p^4) order (assuming a parity symmetry in the strong sector). The O(p^4) invariants are not usually taken into account in similar studies in the literature; however, they have been shown to be potentially important, at least, to reconcile this kind of scheme with electroweak precision tests. Here we use the O(p^4) lagrangian to study the scattering amplitudes for the pi pi sector, investigating the partial wave unitarity properties of the model and its cut-off energy scale. We obtain constraints on the parameter space and compare our result to the one obtained with just the O(p^2) lagrangian, finding that the contribution of the new operators is indeed significant. |
0904.2789 | Surjeet Rajendran | Asimina Arvanitaki, Savas Dimopoulos, Sergei Dubovsky, Peter W.
Graham, Roni Harnik, Surjeet Rajendran | Decaying Dark Matter as a Probe of Unification and TeV Spectroscopy | 7 pages, 5 figures, 1 table, New Refs added | Phys.Rev.D80:055011,2009 | 10.1103/PhysRevD.80.055011 | null | hep-ph astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In supersymmetric unified theories the dark matter particle can decay, just
like the proton, through grand unified interactions with a lifetime of order of
10^{26} sec. Its decay products can be detected by several experiments --
including Fermi, HESS, PAMELA, ATIC, and IceCube -- opening our first direct
window to physics at the TeV scale and simultaneously at the unification scale
10^{16} GeV. We consider possibilities for explaining the electron/positron
spectra observed by HESS, PAMELA, and ATIC, and the resulting predictions for
the gamma-ray, electron/positron, and neutrino spectra as will be measured, for
example, by Fermi and IceCube. The discovery of an isotropic, hard gamma ray
spectral feature at Fermi would be strong evidence for dark matter and would
disfavor astrophysical sources such as pulsars. Substructure in the cosmic ray
spectra probes the spectroscopy of new TeV-mass particles. For example, a
preponderance of electrons in the final state can result from the lightness of
selectrons relative to squarks. Decaying dark matter acts as a sparticle
injector with an energy reach potentially higher than the LHC. The resulting
cosmic ray flux depends only on the values of the weak and unification scales.
| [
{
"created": "Fri, 17 Apr 2009 22:39:09 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2009 20:30:40 GMT",
"version": "v2"
}
] | 2009-09-24 | [
[
"Arvanitaki",
"Asimina",
""
],
[
"Dimopoulos",
"Savas",
""
],
[
"Dubovsky",
"Sergei",
""
],
[
"Graham",
"Peter W.",
""
],
[
"Harnik",
"Roni",
""
],
[
"Rajendran",
"Surjeet",
""
]
] | In supersymmetric unified theories the dark matter particle can decay, just like the proton, through grand unified interactions with a lifetime of order of 10^{26} sec. Its decay products can be detected by several experiments -- including Fermi, HESS, PAMELA, ATIC, and IceCube -- opening our first direct window to physics at the TeV scale and simultaneously at the unification scale 10^{16} GeV. We consider possibilities for explaining the electron/positron spectra observed by HESS, PAMELA, and ATIC, and the resulting predictions for the gamma-ray, electron/positron, and neutrino spectra as will be measured, for example, by Fermi and IceCube. The discovery of an isotropic, hard gamma ray spectral feature at Fermi would be strong evidence for dark matter and would disfavor astrophysical sources such as pulsars. Substructure in the cosmic ray spectra probes the spectroscopy of new TeV-mass particles. For example, a preponderance of electrons in the final state can result from the lightness of selectrons relative to squarks. Decaying dark matter acts as a sparticle injector with an energy reach potentially higher than the LHC. The resulting cosmic ray flux depends only on the values of the weak and unification scales. |
2003.07670 | Er-Liang Cui | Rui-Rui Dong, Niu Su, Hua-Xing Chen, Er-Liang Cui, and Zhi-Yong Zhou | QCD sum rule studies on the $s s \bar s \bar s$ tetraquark states of
$J^{PC} = 0^{-+}$ | 8 pages, 6 figures, suggestions and comments are welcome | null | 10.1140/epjc/s10052-020-8340-9 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the method of QCD sum rules to study the $s s \bar s \bar s$
tetraquark states of $J^{PC} = 0^{-+}$. We construct all the relevant $s s \bar
s \bar s$ tetraquark currents, and find that there are only two independent
ones. We use them to further construct two weakly-correlated mixed currents.
One of them leads to reliable QCD sum rule results and the mass is extracted to
be $2.51^{+0.15}_{-0.12}$ GeV, suggesting that the $X(2370)$ or the $X(2500)$
can be explained as the $ss\bar s\bar s$ tetraquark state of $J^{PC} = 0^{-+}$.
To verify this interpretation, we propose to further study the $\pi\pi/K \bar
K$ invariant mass spectra of the $J/\psi \to \gamma \pi \pi \eta^\prime/\gamma
K \bar K \eta^\prime$ decays in BESIII to examine whether there exists the
$f_0(980)$ resonance.
| [
{
"created": "Tue, 17 Mar 2020 12:45:56 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2020 01:49:22 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Dong",
"Rui-Rui",
""
],
[
"Su",
"Niu",
""
],
[
"Chen",
"Hua-Xing",
""
],
[
"Cui",
"Er-Liang",
""
],
[
"Zhou",
"Zhi-Yong",
""
]
] | We apply the method of QCD sum rules to study the $s s \bar s \bar s$ tetraquark states of $J^{PC} = 0^{-+}$. We construct all the relevant $s s \bar s \bar s$ tetraquark currents, and find that there are only two independent ones. We use them to further construct two weakly-correlated mixed currents. One of them leads to reliable QCD sum rule results and the mass is extracted to be $2.51^{+0.15}_{-0.12}$ GeV, suggesting that the $X(2370)$ or the $X(2500)$ can be explained as the $ss\bar s\bar s$ tetraquark state of $J^{PC} = 0^{-+}$. To verify this interpretation, we propose to further study the $\pi\pi/K \bar K$ invariant mass spectra of the $J/\psi \to \gamma \pi \pi \eta^\prime/\gamma K \bar K \eta^\prime$ decays in BESIII to examine whether there exists the $f_0(980)$ resonance. |
2109.06571 | Carlota Andres | Carlota Andres, Liliana Apolinario, and Fabio Dominguez | Full solution of the medium-induced radiation spectrum | Proceedings of Hard Probes 2020 | PoS HardProbes2020 (2021) 125 | 10.22323/1.387.0125 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New measurements of jet quenching observables at RHIC and at the LHC, such as
jet substructure observables, demand an increased precision in the theory
calculations describing medium-induced radiation of gluons. Closed expressions
for the gluon spectrum including a full resummation of multiple scatterings
have been known for the past 20 years. Still they have only been evaluated in
specific limits either taking a few terms in an opacity expansion or by
employing a Gaussian approximation for the interaction potential -- which
misses essential physical effects. We present here a new flexible method to
compute the full spectrum for a realistic interaction potential, thus allowing
us for the first time to properly quantify the effect of the all-order
resummation of multiple scatterings. This new approach paves the way for
precision phenomenological studies including multiple scattering effects such
as coherence phenomena.
| [
{
"created": "Tue, 14 Sep 2021 10:38:40 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Andres",
"Carlota",
""
],
[
"Apolinario",
"Liliana",
""
],
[
"Dominguez",
"Fabio",
""
]
] | New measurements of jet quenching observables at RHIC and at the LHC, such as jet substructure observables, demand an increased precision in the theory calculations describing medium-induced radiation of gluons. Closed expressions for the gluon spectrum including a full resummation of multiple scatterings have been known for the past 20 years. Still they have only been evaluated in specific limits either taking a few terms in an opacity expansion or by employing a Gaussian approximation for the interaction potential -- which misses essential physical effects. We present here a new flexible method to compute the full spectrum for a realistic interaction potential, thus allowing us for the first time to properly quantify the effect of the all-order resummation of multiple scatterings. This new approach paves the way for precision phenomenological studies including multiple scattering effects such as coherence phenomena. |
hep-ph/9812463 | Martin Hirsch | M. Hirsch and J.W.F. Valle | Neutrinoless double beta decay in Supersymmetry with bilinear R-parity
breaking | revised after referee report, new figure 5, some typos corrected,
accepted for publication in Nucl.Phys.B | Nucl.Phys.B557:60-78,1999 | 10.1016/S0550-3213(99)00368-5 | FTUV/98-100, IFIC/98-101 | hep-ph | null | We reanalyze the contributions to neutrinoless double beta ($\znbb$) decay
from supersymmetry with explicit breaking of R-parity. Although we keep both
bilinear and trilinear terms, our emphasis is put on bilinear R-parity breaking
terms, because these mimic more closely the models where the breaking of
R-parity is spontaneous. Comparing the relevant Feynman diagrams we conclude
that the usual mass mechanism of double beta decay is the dominant one. From
the non-observation of $\znbb$ decay we set limits on the bilinear R-parity
breaking parameters of typically a (few) 100 $keV$. Despite such stringent
bounds, we stress that the magnitude of R-parity violating phenomena that can
be expected at accelerator experiments can be very large, since they involve
mainly the third generation, while $\znbb$ decay constrains only the first
generation couplings.
| [
{
"created": "Mon, 21 Dec 1998 18:55:40 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 1999 19:28:45 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Jun 1999 13:39:10 GMT",
"version": "v3"
}
] | 2009-09-17 | [
[
"Hirsch",
"M.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We reanalyze the contributions to neutrinoless double beta ($\znbb$) decay from supersymmetry with explicit breaking of R-parity. Although we keep both bilinear and trilinear terms, our emphasis is put on bilinear R-parity breaking terms, because these mimic more closely the models where the breaking of R-parity is spontaneous. Comparing the relevant Feynman diagrams we conclude that the usual mass mechanism of double beta decay is the dominant one. From the non-observation of $\znbb$ decay we set limits on the bilinear R-parity breaking parameters of typically a (few) 100 $keV$. Despite such stringent bounds, we stress that the magnitude of R-parity violating phenomena that can be expected at accelerator experiments can be very large, since they involve mainly the third generation, while $\znbb$ decay constrains only the first generation couplings. |
hep-ph/0601132 | Nestor Armesto | N. Armesto and J. G. Milhano | On correlations and discreteness in non-linear QCD evolution | 20 pages, LaTeX, 18 eps figures included using epsfig; changes in v3:
new kind of averaging added, 5 new plots, discussions and conclusions
extended, final version | Phys.Rev.D73:114003,2006 | 10.1103/PhysRevD.73.114003 | null | hep-ph | null | We consider modifications of the standard non-linear QCD evolution in an
attempt to account for some of the missing ingredients discussed recently, such
as correlations, discreteness in gluon emission and Pomeron loops. The
evolution is numerically performed using the Balitsky-Kovchegov equation on
individual configurations defined by a given initial value of the saturation
scale, for reduced rapidities $y=(\alpha_s N_c/\pi) Y<10$. We consider the
effects of averaging over configurations as a way to implement correlations,
using three types of Gaussian averaging around a mean saturation scale.
Further, we heuristically mimic discreteness in gluon emission by considering a
modified evolution in which the tails of the gluon distributions are cut-off.
The approach to scaling and the behavior of the saturation scale with rapidity
in these modified evolutions are studied and compared with the standard
mean-field results. For the large but finite values of rapidity explored, no
strong quantitative difference in scaling for transverse momenta around the
saturation scale is observed. At larger transverse momenta, the influence of
the modifications in the evolution seems most noticeable in the first steps of
the evolution. No influence on the rapidity behavior of the saturation scale
due to the averaging procedure is found. In the cut-off evolution the rapidity
evolution of the saturation scale is slowed down and strongly depends on the
value of the cut-off. Our results stress the need to go beyond simple
modifications of evolution by developing proper theoretical tools that
implement such recently discussed ingredients.
| [
{
"created": "Tue, 17 Jan 2006 15:50:22 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2006 15:38:06 GMT",
"version": "v2"
},
{
"created": "Tue, 16 May 2006 12:11:25 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Armesto",
"N.",
""
],
[
"Milhano",
"J. G.",
""
]
] | We consider modifications of the standard non-linear QCD evolution in an attempt to account for some of the missing ingredients discussed recently, such as correlations, discreteness in gluon emission and Pomeron loops. The evolution is numerically performed using the Balitsky-Kovchegov equation on individual configurations defined by a given initial value of the saturation scale, for reduced rapidities $y=(\alpha_s N_c/\pi) Y<10$. We consider the effects of averaging over configurations as a way to implement correlations, using three types of Gaussian averaging around a mean saturation scale. Further, we heuristically mimic discreteness in gluon emission by considering a modified evolution in which the tails of the gluon distributions are cut-off. The approach to scaling and the behavior of the saturation scale with rapidity in these modified evolutions are studied and compared with the standard mean-field results. For the large but finite values of rapidity explored, no strong quantitative difference in scaling for transverse momenta around the saturation scale is observed. At larger transverse momenta, the influence of the modifications in the evolution seems most noticeable in the first steps of the evolution. No influence on the rapidity behavior of the saturation scale due to the averaging procedure is found. In the cut-off evolution the rapidity evolution of the saturation scale is slowed down and strongly depends on the value of the cut-off. Our results stress the need to go beyond simple modifications of evolution by developing proper theoretical tools that implement such recently discussed ingredients. |
1607.00244 | Debasish Borah | Debasish Borah | Light Sterile Neutrino and Dark Matter in Left-Right Symmetric Models
Without Higgs Bidoublet | Version 2: Minor changes, to appear in Phys. Rev. D | Phys. Rev. D 94, 075024 (2016) | 10.1103/PhysRevD.94.075024 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of left-right symmetric models where Dirac as well as
Majorana mass terms of neutrinos can arise at one-loop level in a scotogenic
fashion: with dark matter particles going inside the loop. We show the
possibility of naturally light right handed neutrinos that can have interesting
implications at neutrinoless double beta decay experiments as well as
cosmology. Apart from a stable dark matter candidate stabilised by a remnant
$Z_2$ symmetry, one can also have a long lived keV sterile neutrino dark matter
in these models. This class of models can have very different collider
signatures compared to the conventional left-right models.
| [
{
"created": "Fri, 1 Jul 2016 13:47:43 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Oct 2016 16:04:07 GMT",
"version": "v2"
}
] | 2016-11-09 | [
[
"Borah",
"Debasish",
""
]
] | We present a class of left-right symmetric models where Dirac as well as Majorana mass terms of neutrinos can arise at one-loop level in a scotogenic fashion: with dark matter particles going inside the loop. We show the possibility of naturally light right handed neutrinos that can have interesting implications at neutrinoless double beta decay experiments as well as cosmology. Apart from a stable dark matter candidate stabilised by a remnant $Z_2$ symmetry, one can also have a long lived keV sterile neutrino dark matter in these models. This class of models can have very different collider signatures compared to the conventional left-right models. |
hep-ph/0205032 | Xing ZhiZhong | Zhi-zhong Xing | A Full Determination of the Neutrino Mass Spectrum from Two-zero
Textures of the Neutrino Mass Matrix | LaTex 8 pages. Modifications made. References added. Acknowledgments
changed | Phys.Lett. B539 (2002) 85-90 | 10.1016/S0370-2693(02)02062-2 | BIHEP-TH-2002-25 | hep-ph | null | We show that it is possible to fully determine the neutrino mass spectrum
from two-zero textures of the neutrino mass matrix. As a consequence, definite
predictions can be obtained for the neutrinoless double beta decay.
| [
{
"created": "Fri, 3 May 2002 01:29:26 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2002 06:55:00 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Xing",
"Zhi-zhong",
""
]
] | We show that it is possible to fully determine the neutrino mass spectrum from two-zero textures of the neutrino mass matrix. As a consequence, definite predictions can be obtained for the neutrinoless double beta decay. |
1002.3628 | Klaus Rabbertz | Klaus Rabbertz | QCD and Electroweak Physics at LHC | 10 pages, 14 figures; Contribution to the 9th International Symposium
on Radiative Corrections (RADCOR 2009), October 25-30 2009, Ascona,
Switzerland | PoS(RADCOR2009)016 | null | CMS CR-2010/023 | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | First LHC data have been collected and collisions at a center-of-mass energy
of 7 TeV are anticipated for the next months. The commissioning of the
detectors and the re-establishment of the Standard Model in the new energy
regime will be the main tasks for the experimental collaborations in the year
to come. This report summarizes the measurement plans and performance
expectations of the ATLAS and CMS experiments for a selected number of QCD and
electroweak analyses with an emphasis on the early data taking phase. Some
longer term prospects are pointed out.
| [
{
"created": "Thu, 18 Feb 2010 22:12:45 GMT",
"version": "v1"
}
] | 2010-02-22 | [
[
"Rabbertz",
"Klaus",
""
]
] | First LHC data have been collected and collisions at a center-of-mass energy of 7 TeV are anticipated for the next months. The commissioning of the detectors and the re-establishment of the Standard Model in the new energy regime will be the main tasks for the experimental collaborations in the year to come. This report summarizes the measurement plans and performance expectations of the ATLAS and CMS experiments for a selected number of QCD and electroweak analyses with an emphasis on the early data taking phase. Some longer term prospects are pointed out. |
hep-ph/9308322 | Stefano Forte | Richard Ball and Stefano Forte | Anomalous Evolution of the Gottfried Sum | plain TeX with the harvmac macropackage, 35 pages (harvmac b mode),
11 figures included in a separate uuencoded postscript file, OUTP-93-18P,
DFTT 9/93 | Nucl.Phys.B425:516-552,1994 | 10.1016/0550-3213(94)90286-0 | null | hep-ph | null | We discuss nonperturbative QCD evolution of nonsinglet nucleon structure
functions, with particular application to the Gottfried sum. We show that the
coupling of the quark partons to bound state mesons leads to nonperturbative
contributions to the Altarelli--Parisi equations which, due to the axial
anomaly, result in a strong scale dependence of nonsinglet structure functions
for values of $Q^2$ around the nucleon mass scale. We compute specifically the
evolution of the first moment of the quark distribution, and find that it is
sufficient to explain recent experimental data which indicate a violation of
the Gottfried sum rule.
| [
{
"created": "Mon, 23 Aug 1993 17:57:34 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Ball",
"Richard",
""
],
[
"Forte",
"Stefano",
""
]
] | We discuss nonperturbative QCD evolution of nonsinglet nucleon structure functions, with particular application to the Gottfried sum. We show that the coupling of the quark partons to bound state mesons leads to nonperturbative contributions to the Altarelli--Parisi equations which, due to the axial anomaly, result in a strong scale dependence of nonsinglet structure functions for values of $Q^2$ around the nucleon mass scale. We compute specifically the evolution of the first moment of the quark distribution, and find that it is sufficient to explain recent experimental data which indicate a violation of the Gottfried sum rule. |
2310.09380 | Klaus Werner | K. Werner | Parallel scattering, saturation, and generalized
Abramovskii-Gribov-Kancheli (AGK) theorem in the EPOS4 framework, with
applications for heavy-ion collisions at $\sqrt{s_{NN}}$ of 5.02 TeV and 200
GeV | 53 pages, 73 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Ultrarelativistic heavy-ion collisions will first realize many
nucleon-nucleon scatterings, happening instantaneously and therefore
necessarily in parallel, due to the short collision time. An appropriate
quantum mechanical tool to treat that problem is S-matrix theory, and it has
been known for a long time how to derive a simple geometric probabilistic
picture, still widely used, and here the Abramovskii-Gribov-Kancheli (AGK)
theorem plays a crucial role. All this is done in a scenario where energy
conservation is not taken care of, but this is needed, in particular for Monte
Carlo simulations. When introducing energy-momentum sharing properly, the AGK
theorem does not apply anymore, nor do simple geometric concepts such as binary
scaling. I will discuss this (very serious) problem, and how it can be solved,
in the EPOS4 framework. When connecting the multiple Pomeron approach (for
parallel scatterings) and perturbative QCD, one is actually forced to implement
in a very particular way saturation scales, in order to get an approach free of
contradictions. One recovers a generalized AGK theorem (gAGK), valid at large
$p_{t}$ (larger than the relevant saturation scales). I discuss how gAGK is
related to factorization (in proton-proton scatterings) and binary scaling (in
heavy-ion collisions). I will show some applications, using this new approach
as an initial condition for hydrodynamical evolutions, for heavy-ion collisions
at $\sqrt{s_{NN}}$ of 5.02 TeV and 200 GeV, to get some idea about the energy
dependence.
| [
{
"created": "Fri, 13 Oct 2023 19:59:11 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2024 17:10:14 GMT",
"version": "v2"
}
] | 2024-04-02 | [
[
"Werner",
"K.",
""
]
] | Ultrarelativistic heavy-ion collisions will first realize many nucleon-nucleon scatterings, happening instantaneously and therefore necessarily in parallel, due to the short collision time. An appropriate quantum mechanical tool to treat that problem is S-matrix theory, and it has been known for a long time how to derive a simple geometric probabilistic picture, still widely used, and here the Abramovskii-Gribov-Kancheli (AGK) theorem plays a crucial role. All this is done in a scenario where energy conservation is not taken care of, but this is needed, in particular for Monte Carlo simulations. When introducing energy-momentum sharing properly, the AGK theorem does not apply anymore, nor do simple geometric concepts such as binary scaling. I will discuss this (very serious) problem, and how it can be solved, in the EPOS4 framework. When connecting the multiple Pomeron approach (for parallel scatterings) and perturbative QCD, one is actually forced to implement in a very particular way saturation scales, in order to get an approach free of contradictions. One recovers a generalized AGK theorem (gAGK), valid at large $p_{t}$ (larger than the relevant saturation scales). I discuss how gAGK is related to factorization (in proton-proton scatterings) and binary scaling (in heavy-ion collisions). I will show some applications, using this new approach as an initial condition for hydrodynamical evolutions, for heavy-ion collisions at $\sqrt{s_{NN}}$ of 5.02 TeV and 200 GeV, to get some idea about the energy dependence. |
1404.2581 | Alberto Tonero Dr. | Alberto Tonero and Rogerio Rosenfeld | Dipole-induced anomalous top quark couplings at the LHC | 9 pages, 1 figure, 1 table; references added. Version accepted for
publication in PRD | null | 10.1103/PhysRevD.90.017701 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider direct bounds on the coefficients of higher dimensional top quark
dipole operators from their contributions to anomalous top couplings that
affect some related processes at the LHC. Several observables are studied. In
particular, we incorporate for the first time in this type of analysis the
recently measured associated $t \bar{t} V$ production, which is currently the
only measured direct observable sensitive to the dipole operator involving the
hypercharge field. We perform a Bayesian analysis to derive the $1(2)\sigma$
confidence level (CL) intervals on these coefficients.
| [
{
"created": "Wed, 9 Apr 2014 19:21:21 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jul 2014 17:00:11 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Tonero",
"Alberto",
""
],
[
"Rosenfeld",
"Rogerio",
""
]
] | We consider direct bounds on the coefficients of higher dimensional top quark dipole operators from their contributions to anomalous top couplings that affect some related processes at the LHC. Several observables are studied. In particular, we incorporate for the first time in this type of analysis the recently measured associated $t \bar{t} V$ production, which is currently the only measured direct observable sensitive to the dipole operator involving the hypercharge field. We perform a Bayesian analysis to derive the $1(2)\sigma$ confidence level (CL) intervals on these coefficients. |
1803.09762 | Camilo Garcia-Cely | Xiaoyong Chu, Camilo Garcia-Cely | Core formation from self-heating dark matter | Published version. 9 pages, 7 figures | null | 10.1088/1475-7516/2018/07/013 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological simulations of the $\Lambda$CDM model suggest that the dark
matter halos of dwarf galaxies are denser in their center than what
observational data of such galaxies imply. In this letter, we propose a novel
solution to this problem by invoking a certain class of dark matter
self-heating processes. As we will argue, such processes lead to the formation
of dark matter cores at late times by considerably reducing the inner mass
density of dwarf-sized halos. For deriving concrete results, we focus on
semi-annihilating dark matter scenarios and model the inner region of dark
matter halos as a gravothermal fluid. An important aspect of this new solution
is that the semi-annihilation effects are much more prominent in dwarf-sized
halos than in the more massive halos that host galaxies and clusters, even if
the corresponding cross sections are the same. Furthermore, the preferred
parameter space for solving the small-scale problem suggests a thermal dark
matter candidate with a mass below the GeV scale, which can be probed in dark
matter direct and indirect detection experiments.
| [
{
"created": "Mon, 26 Mar 2018 18:00:08 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jul 2018 16:45:50 GMT",
"version": "v2"
}
] | 2018-07-18 | [
[
"Chu",
"Xiaoyong",
""
],
[
"Garcia-Cely",
"Camilo",
""
]
] | Cosmological simulations of the $\Lambda$CDM model suggest that the dark matter halos of dwarf galaxies are denser in their center than what observational data of such galaxies imply. In this letter, we propose a novel solution to this problem by invoking a certain class of dark matter self-heating processes. As we will argue, such processes lead to the formation of dark matter cores at late times by considerably reducing the inner mass density of dwarf-sized halos. For deriving concrete results, we focus on semi-annihilating dark matter scenarios and model the inner region of dark matter halos as a gravothermal fluid. An important aspect of this new solution is that the semi-annihilation effects are much more prominent in dwarf-sized halos than in the more massive halos that host galaxies and clusters, even if the corresponding cross sections are the same. Furthermore, the preferred parameter space for solving the small-scale problem suggests a thermal dark matter candidate with a mass below the GeV scale, which can be probed in dark matter direct and indirect detection experiments. |
2005.04996 | Xu-Dong Huang | Xu-Dong Huang, Xing-Gang Wu, Jun Zeng, Qing Yu, Xu-Chang Zheng and
Shuai Xu | Determination of the top-quark $\overline{\rm MS}$ running mass via its
perturbative relation to the on-shell mass with the help of principle of
maximum conformality | 8 pages, 2 figures | Phys. Rev. D 101, 114024 (2020) | 10.1103/PhysRevD.101.114024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper, we study the properties of the top-quark $\overline{\rm MS}$
running mass computed from its on-shell mass by using both the four-loop
$\overline{\rm MS}$-on-shell relation and the principle of maximum conformality
(PMC) scale-setting approach. The PMC adopts the renormalization group equation
to set the correct magnitude of the strong running coupling of the perturbative
series, its prediction avoids the conventional renormalization scale ambiguity,
and thus a more precise pQCD prediction can be achieved. After applying the PMC
to the four-loop $\overline{\rm MS}$-on-shell relation and taking the top-quark
on-shell mass $M_t=172.9\pm0.4$ GeV as an input, we obtain the renormalization
scale-invariant $\overline{\rm MS}$ running mass at the scale $m_t$, e.g.,
$m_t(m_t)\simeq 162.6\pm 0.4$ GeV, in which the error is the squared average of
those from $\Delta \alpha_s(M_Z)$, $\Delta M_t$, and the approximate error from
the uncalculated five-loop terms predicted by using the Pad\'{e} approximation
approach.
| [
{
"created": "Mon, 11 May 2020 11:06:37 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jun 2020 01:35:38 GMT",
"version": "v2"
}
] | 2020-06-25 | [
[
"Huang",
"Xu-Dong",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Zeng",
"Jun",
""
],
[
"Yu",
"Qing",
""
],
[
"Zheng",
"Xu-Chang",
""
],
[
"Xu",
"Shuai",
""
]
] | In the paper, we study the properties of the top-quark $\overline{\rm MS}$ running mass computed from its on-shell mass by using both the four-loop $\overline{\rm MS}$-on-shell relation and the principle of maximum conformality (PMC) scale-setting approach. The PMC adopts the renormalization group equation to set the correct magnitude of the strong running coupling of the perturbative series, its prediction avoids the conventional renormalization scale ambiguity, and thus a more precise pQCD prediction can be achieved. After applying the PMC to the four-loop $\overline{\rm MS}$-on-shell relation and taking the top-quark on-shell mass $M_t=172.9\pm0.4$ GeV as an input, we obtain the renormalization scale-invariant $\overline{\rm MS}$ running mass at the scale $m_t$, e.g., $m_t(m_t)\simeq 162.6\pm 0.4$ GeV, in which the error is the squared average of those from $\Delta \alpha_s(M_Z)$, $\Delta M_t$, and the approximate error from the uncalculated five-loop terms predicted by using the Pad\'{e} approximation approach. |
hep-ph/9706547 | Alan R. White | Alan R. White | Excess Cross-Sections at the Electroweak Scale in the Sextet Quark
``Standard Model'' | 3 pages, with 1 ps figure in the text. Presented at the 5th
International Workshop on Deep Inelastic Scattering and QCD, Chicago,
Illinois, USA, April 14-18, 1997 | null | 10.1063/1.53604 | ANL-HEP-CP-97-47 | hep-ph | null | If dynamical electroweak symmetry breaking is due to a flavor doublet of
color sextet quarks, enhanced electroweak scale QCD instanton interactions may
produce a large top mass, raise the $\eta_6$ axion mass, and also explain the
excesses in the DIS cross-section at HERA and jet cross-sections at the
Tevatron.
| [
{
"created": "Mon, 30 Jun 1997 14:32:09 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"White",
"Alan R.",
""
]
] | If dynamical electroweak symmetry breaking is due to a flavor doublet of color sextet quarks, enhanced electroweak scale QCD instanton interactions may produce a large top mass, raise the $\eta_6$ axion mass, and also explain the excesses in the DIS cross-section at HERA and jet cross-sections at the Tevatron. |
hep-ph/9508367 | Charles A. Nelson | Charles A. Nelson, Minseob Kim, Daryl P. Nazareth, and Hui-Chun Yang | A General Treatment of Tau Semi-Leptonic Decays | Contributed paper to LP95, Beijing. Expanded version to be submitted
to Phys. Rev. Before LaTeXing, cut off "by-line" at bottom | null | null | SUNY BING 7/1/95 | hep-ph | null | The most general Lorentz invariant spin-correlation functions for $\tau
^{-}\rightarrow \rho ^{-}\nu ,a_1^{-}\nu ,K^{*-}\nu , \pi ^{-}\nu ,K^{-}\nu $
are expressed in terms of eight semi-leptonic parameters. They are physically
defined in terms of tau-decay partial-width-intensities for
polarized-final-states. The parameters are also expressed in terms of a
``$(V-A)\ +\ $additional chiral coupling'' structure in the
${J^{Charged}}_{Lepton}$ current, so as to bound the scales $\Lambda $\ for
``new physics'' such as arising from leptonic CP violation, tau weak magnetism,
weak electricity, and/or second-class currents. The two tests for leptonic CP
violation in $\tau \rightarrow \rho \nu \ $ decay are generalized to $\tau
\rightarrow a_1\nu \ $ decay and to two additional tests if there are $\nu _R\
$ and $\bar \nu _L\ $ couplings.
| [
{
"created": "Thu, 24 Aug 1995 13:13:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nelson",
"Charles A.",
""
],
[
"Kim",
"Minseob",
""
],
[
"Nazareth",
"Daryl P.",
""
],
[
"Yang",
"Hui-Chun",
""
]
] | The most general Lorentz invariant spin-correlation functions for $\tau ^{-}\rightarrow \rho ^{-}\nu ,a_1^{-}\nu ,K^{*-}\nu , \pi ^{-}\nu ,K^{-}\nu $ are expressed in terms of eight semi-leptonic parameters. They are physically defined in terms of tau-decay partial-width-intensities for polarized-final-states. The parameters are also expressed in terms of a ``$(V-A)\ +\ $additional chiral coupling'' structure in the ${J^{Charged}}_{Lepton}$ current, so as to bound the scales $\Lambda $\ for ``new physics'' such as arising from leptonic CP violation, tau weak magnetism, weak electricity, and/or second-class currents. The two tests for leptonic CP violation in $\tau \rightarrow \rho \nu \ $ decay are generalized to $\tau \rightarrow a_1\nu \ $ decay and to two additional tests if there are $\nu _R\ $ and $\bar \nu _L\ $ couplings. |
hep-ph/0001113 | Dimitri Melikhov | D. Melikhov and B. Stech | Weak form factors for heavy meson decays: an update | revtex, 17 pages, improved version to be published in Phys. Rev. D.
Results remain unchanged, but the presentation has been modified: now
parametrizations for the form factors $A_0$, $A_1$, $A_2$ etc are given; and
estimates of the weak and strong coupling constants of heavy mesons are
added; few typoes corrected | Phys.Rev. D62 (2000) 014006 | 10.1103/PhysRevD.62.014006 | Heidelberg preprint HD-THEP-00-01 | hep-ph | null | We calculate the form factors for weak decays of $B_{(s)}$ and $D_{(s)}$
mesons to light pseudoscalar and vector mesons. To reveal the intimate
connection between different decay modes and to be able to perform the
calculations in the full physical $q^2$-region we use a relativistic dispersion
approach based on the constituent quark picture. This approach gives the form
factors as relativistic double spectral representations in terms of the wave
functions of the initial and final mesons. The form factors have the correct
analytic properties and satisfy general requirements of nonperturbative QCD in
the heavy quark limit.
The disadvantages of quark models related to ill-defined effective quark
masses and not precisely known meson wave functions are reduced by fitting the
quark model parameters to lattice QCD results for the $B\to \rho$ transition
form factors at large momentum transfers and to the measured total $D\to
(K,K^*)l\nu$ decay rates. This allows us to predict numerous form factors for
all kinematically accessible $q^2$ values.
| [
{
"created": "Thu, 13 Jan 2000 15:03:41 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Mar 2000 13:28:59 GMT",
"version": "v2"
},
{
"created": "Thu, 11 May 2000 09:13:28 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Melikhov",
"D.",
""
],
[
"Stech",
"B.",
""
]
] | We calculate the form factors for weak decays of $B_{(s)}$ and $D_{(s)}$ mesons to light pseudoscalar and vector mesons. To reveal the intimate connection between different decay modes and to be able to perform the calculations in the full physical $q^2$-region we use a relativistic dispersion approach based on the constituent quark picture. This approach gives the form factors as relativistic double spectral representations in terms of the wave functions of the initial and final mesons. The form factors have the correct analytic properties and satisfy general requirements of nonperturbative QCD in the heavy quark limit. The disadvantages of quark models related to ill-defined effective quark masses and not precisely known meson wave functions are reduced by fitting the quark model parameters to lattice QCD results for the $B\to \rho$ transition form factors at large momentum transfers and to the measured total $D\to (K,K^*)l\nu$ decay rates. This allows us to predict numerous form factors for all kinematically accessible $q^2$ values. |
hep-ph/0612003 | Ho-Meoyng Choi | Chueng-Ryong Ji (North Carolina State Univ.), Bernard L. G. Bakker
(Vrije Univ.) and Ho-Meoyng Choi (Kyungpook Nat'l Univ.) | New Developments in Treacherous Points of Light-Front Dynamics | 5 pages, espcrc1.sty. proceedings of FB XVIII (August 2006, Brazil),
to be published in Nucl. Phys. A | Nucl.Phys.A790:583-587,2007 | 10.1016/j.nuclphysa.2007.03.099 | null | hep-ph | null | Light-front dynamics(LFD) plays an important role in hadron phenomenology.
Last few years, however, it has been emphasized that treacherous points such as
zero-mode contributions should be taken into account for successful LFD
applications to hadron phenomenology. We discuss examples of treacherous points
and present new progresses made last few years to handle them correctly.
| [
{
"created": "Fri, 1 Dec 2006 01:43:30 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Ji",
"Chueng-Ryong",
"",
"North Carolina State Univ."
],
[
"Bakker",
"Bernard L. G.",
"",
"Vrije Univ."
],
[
"Choi",
"Ho-Meoyng",
"",
"Kyungpook Nat'l Univ."
]
] | Light-front dynamics(LFD) plays an important role in hadron phenomenology. Last few years, however, it has been emphasized that treacherous points such as zero-mode contributions should be taken into account for successful LFD applications to hadron phenomenology. We discuss examples of treacherous points and present new progresses made last few years to handle them correctly. |
1909.10398 | Mario Neves Junior | Y. M. P. Gomes, P. C. Malta and M. J. Neves | Testing Lorentz-symmetry violation via electroweak decays | 12 pages, 2 figures, matches published version | Phys. Rev. D 101, 075001 (2020) | 10.1103/PhysRevD.101.075001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we introduce CPT-odd non-minimal Lorentz-symmetry violating
couplings to the electroweak sector modifying the interaction between leptons
and gauge bosons. The vertex rules allow us to calculate tree-level processes
modified by the presence of the novel dimension-five operators. For
definitiveness, we investigate the $W$ decay into a lepton-neutrino pair, the
$Z$ decay into pairs of charged and neutral leptons, as well as the decay of
the muon. By comparing the experimental measurements on these processes to our
results we are able to bound several combinations of the background 4-vectors
to be $\lesssim 10^{-4} \, \mbox{GeV}^{-1}$.
| [
{
"created": "Mon, 23 Sep 2019 14:42:01 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Dec 2019 23:08:07 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Apr 2020 18:02:57 GMT",
"version": "v3"
}
] | 2020-04-08 | [
[
"Gomes",
"Y. M. P.",
""
],
[
"Malta",
"P. C.",
""
],
[
"Neves",
"M. J.",
""
]
] | In this work we introduce CPT-odd non-minimal Lorentz-symmetry violating couplings to the electroweak sector modifying the interaction between leptons and gauge bosons. The vertex rules allow us to calculate tree-level processes modified by the presence of the novel dimension-five operators. For definitiveness, we investigate the $W$ decay into a lepton-neutrino pair, the $Z$ decay into pairs of charged and neutral leptons, as well as the decay of the muon. By comparing the experimental measurements on these processes to our results we are able to bound several combinations of the background 4-vectors to be $\lesssim 10^{-4} \, \mbox{GeV}^{-1}$. |
1310.3214 | Giovanni Ossola | Giovanni Ossola | Automated computation of scattering amplitudes | 13 pages, v2: references corrected. Presented at the "International
Workshop on Advanced Computing and Analysis Techniques in Physics Research"
(ACAT2013), Beijing, China, May 2013 | null | 10.1088/1742-6596/523/1/012040 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review some of the recent advances in the computation of one-loop
scattering amplitudes which led to the construction of efficient and automated
computational tools for NLO predictions. Particular attention is devoted to
unitarity-based methods and integrand-level reduction techniques. Extensions of
one-loop integrand-level techniques to higher orders are also briefly
illustrated.
| [
{
"created": "Fri, 11 Oct 2013 17:33:27 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Nov 2013 19:34:42 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Ossola",
"Giovanni",
""
]
] | We review some of the recent advances in the computation of one-loop scattering amplitudes which led to the construction of efficient and automated computational tools for NLO predictions. Particular attention is devoted to unitarity-based methods and integrand-level reduction techniques. Extensions of one-loop integrand-level techniques to higher orders are also briefly illustrated. |
1807.03312 | Sung Hak Lim | Sung Hak Lim and Mihoko M. Nojiri | Spectral Analysis of Jet Substructure with Neural Networks: Boosted
Higgs Case | 18 pages, 12 figures, published in JHEP. A cut-based analysis is
added | JHEP10(2018)181 | 10.1007/JHEP10(2018)181 | KEK-TH-2060 | hep-ph hep-ex stat.ML | http://creativecommons.org/licenses/by/4.0/ | Jets from boosted heavy particles have a typical angular scale which can be
used to distinguish them from QCD jets. We introduce a machine learning
strategy for jet substructure analysis using a spectral function on the angular
scale. The angular spectrum allows us to scan energy deposits over the angle
between a pair of particles in a highly visual way. We set up an artificial
neural network (ANN) to find out characteristic shapes of the spectra of the
jets from heavy particle decays. By taking the Higgs jets and QCD jets as
examples, we show that the ANN of the angular spectrum input has similar
performance to existing taggers. In addition, some improvement is seen when
additional extra radiations occur. Notably, the new algorithm automatically
combines the information of the multi-point correlations in the jet.
| [
{
"created": "Mon, 9 Jul 2018 18:00:04 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Oct 2018 17:22:29 GMT",
"version": "v2"
}
] | 2018-10-31 | [
[
"Lim",
"Sung Hak",
""
],
[
"Nojiri",
"Mihoko M.",
""
]
] | Jets from boosted heavy particles have a typical angular scale which can be used to distinguish them from QCD jets. We introduce a machine learning strategy for jet substructure analysis using a spectral function on the angular scale. The angular spectrum allows us to scan energy deposits over the angle between a pair of particles in a highly visual way. We set up an artificial neural network (ANN) to find out characteristic shapes of the spectra of the jets from heavy particle decays. By taking the Higgs jets and QCD jets as examples, we show that the ANN of the angular spectrum input has similar performance to existing taggers. In addition, some improvement is seen when additional extra radiations occur. Notably, the new algorithm automatically combines the information of the multi-point correlations in the jet. |
1701.01551 | Wei Chen | Hua-Xing Chen, Wei Chen, Jun He, Xiang Liu, and Shi-Lin Zhu | The hidden-charm multiquark states | Plenary talk at the 26th International Nuclear Physics Conference,
11-16 September 2016, Adelaide, Australia | POS (INPC2016) 374 | null | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since 2003 many charmonium-like states were observed experimentally.
Especially those charged charmonium-like $Z_c$ states and bottomonium-like
$Z_b$ states cannot be accommodated within the naive quark model, which are
good candidates of either the hidden-charm tetraquark states or molecules
composed of a pair of charmed mesons. In 2015, the LHCb Collaboration
discovered two hidden-charm pentaquark states, which are also beyond the quark
model. In this talk, we review the current experimental progress and
investigate various theoretical interpretations of these candidates of the
multiquark states. We list the puzzles and theoretical challenges of these
models when confronted with the experimental data. We also discuss possible
future measurements which may distinguish the theoretical schemes on the
underlying structures of the hidden-charm multiquark states.
| [
{
"created": "Fri, 6 Jan 2017 06:07:55 GMT",
"version": "v1"
}
] | 2017-01-10 | [
[
"Chen",
"Hua-Xing",
""
],
[
"Chen",
"Wei",
""
],
[
"He",
"Jun",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | Since 2003 many charmonium-like states were observed experimentally. Especially those charged charmonium-like $Z_c$ states and bottomonium-like $Z_b$ states cannot be accommodated within the naive quark model, which are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. In 2015, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this talk, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states. |
hep-ph/0201032 | Yara do Amaral Coutinho | F.M.L. Almeida Jr., Y. A. Coutinho, J. A. Martins Sim\~oes and M.A.B.
do Vale | Heavy Majorana neutrinos at a very large electron-proton collider | 3 pages and 5 figures To appear in Physical Review D | null | null | null | hep-ph | null | We study the discovery potential for detecting new neutral heavy Majorana
leptons as suggested by some extentions of the Standard Model in recently
proposed electron-proton colliders. Since 1998-1999 the option of an
electron-proton collider for the Very Large Hadron Collider at Fermilab
operating with the proton booster has been considered. We study the reaction
$e^{-}p \longrightarrow e^{+}+ jets$ and present estimates for the signal and
Standard Model background including hadronization.
| [
{
"created": "Mon, 7 Jan 2002 12:29:14 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2002 13:34:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Almeida",
"F. M. L.",
"Jr."
],
[
"Coutinho",
"Y. A.",
""
],
[
"Simões",
"J. A. Martins",
""
],
[
"Vale",
"M. A. B. do",
""
]
] | We study the discovery potential for detecting new neutral heavy Majorana leptons as suggested by some extentions of the Standard Model in recently proposed electron-proton colliders. Since 1998-1999 the option of an electron-proton collider for the Very Large Hadron Collider at Fermilab operating with the proton booster has been considered. We study the reaction $e^{-}p \longrightarrow e^{+}+ jets$ and present estimates for the signal and Standard Model background including hadronization. |
1401.4458 | Ian Moult | Andrew J. Larkoski, Ian Moult, Duff Neill | Toward Multi-Differential Cross Sections: Measuring Two Angularities on
a Single Jet | 43 pages plus appendices, 8 figures. v2 as published in JHEP. minor
typos corrected | null | 10.1007/JHEP09(2014)046 | MIT-CTP 4525 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analytic study of differential cross sections in QCD has typically
focused on individual observables, such as mass or thrust, to great success.
Here, we present a first study of double differential jet cross sections
considering two recoil-free angularities measured on a single jet. By analyzing
the phase space defined by the two angularities and using methods from
soft-collinear effective theory, we prove that the double differential cross
section factorizes at the boundaries of the phase space. We also show that the
cross section in the bulk of the phase space cannot be factorized using only
soft and collinear modes, excluding the possibility of a global factorization
theorem in soft-collinear effective theory. Nevertheless, we are able to define
a simple interpolation procedure that smoothly connects the factorization
theorem at one boundary to the other. We present an explicit example of this at
next-to-leading logarithmic accuracy and show that the interpolation is unique
up to $\alpha_s^4$ order in the exponent of the cross section, under reasonable
assumptions. This is evidence that the interpolation is sufficiently robust to
account for all logarithms in the bulk of phase space to the accuracy of the
boundary factorization theorem. We compare our analytic calculation of the
double differential cross section to Monte Carlo simulation and find
qualitative agreement. Because our arguments rely on general structures of the
phase space, we expect that much of our analysis would be relevant for the
study of phenomenologically well-motivated observables, such as
$N$-subjettiness, energy correlation functions, and planar flow.
| [
{
"created": "Fri, 17 Jan 2014 21:00:04 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Sep 2014 20:39:24 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Larkoski",
"Andrew J.",
""
],
[
"Moult",
"Ian",
""
],
[
"Neill",
"Duff",
""
]
] | The analytic study of differential cross sections in QCD has typically focused on individual observables, such as mass or thrust, to great success. Here, we present a first study of double differential jet cross sections considering two recoil-free angularities measured on a single jet. By analyzing the phase space defined by the two angularities and using methods from soft-collinear effective theory, we prove that the double differential cross section factorizes at the boundaries of the phase space. We also show that the cross section in the bulk of the phase space cannot be factorized using only soft and collinear modes, excluding the possibility of a global factorization theorem in soft-collinear effective theory. Nevertheless, we are able to define a simple interpolation procedure that smoothly connects the factorization theorem at one boundary to the other. We present an explicit example of this at next-to-leading logarithmic accuracy and show that the interpolation is unique up to $\alpha_s^4$ order in the exponent of the cross section, under reasonable assumptions. This is evidence that the interpolation is sufficiently robust to account for all logarithms in the bulk of phase space to the accuracy of the boundary factorization theorem. We compare our analytic calculation of the double differential cross section to Monte Carlo simulation and find qualitative agreement. Because our arguments rely on general structures of the phase space, we expect that much of our analysis would be relevant for the study of phenomenologically well-motivated observables, such as $N$-subjettiness, energy correlation functions, and planar flow. |
2407.09754 | Ana Julia Mizher | A. Ayala and A. Mizher | Influence of magnetic field-induced anisotropic gluon pressure during
pre-equilibrium in heavy-ion collisions: A faster road towards isotropization | 5 pages, 5 figures | null | null | null | hep-ph hep-th nucl-th | http://creativecommons.org/licenses/by/4.0/ | Magnetic fields of a large intensity can be generated in peripheral
high-energy heavy-ion collisions. Although their intensity drops fast and,
moreover, it is not clear whether these fields last long enough to induce a
magnetization during the quark-gluon plasma phase, most of the models and
simulations predict a significant intensity that lasts up to proper times of
order 1 fm after the beginning of the reaction, which is a typical time for the
hydrodynamical phase to start. This interval of time is referred to as the
pre-equilibrium stage. The evolution of the reaction during pre-equilibrium is
thus likely to be influenced by these fields. In this work we adopt a strong
field approximation to study the effects of the magnetic field-induced
anisotropy on the gluon pressure. We include this anisotropy within the
description obtained by means of Effective Kinetic Theory and explore the
consequences to reach isotropization at proper times of order 1 fm. We show
that when including the magnetic field effects, isotropization is achieved
faster.
| [
{
"created": "Sat, 13 Jul 2024 03:09:45 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Ayala",
"A.",
""
],
[
"Mizher",
"A.",
""
]
] | Magnetic fields of a large intensity can be generated in peripheral high-energy heavy-ion collisions. Although their intensity drops fast and, moreover, it is not clear whether these fields last long enough to induce a magnetization during the quark-gluon plasma phase, most of the models and simulations predict a significant intensity that lasts up to proper times of order 1 fm after the beginning of the reaction, which is a typical time for the hydrodynamical phase to start. This interval of time is referred to as the pre-equilibrium stage. The evolution of the reaction during pre-equilibrium is thus likely to be influenced by these fields. In this work we adopt a strong field approximation to study the effects of the magnetic field-induced anisotropy on the gluon pressure. We include this anisotropy within the description obtained by means of Effective Kinetic Theory and explore the consequences to reach isotropization at proper times of order 1 fm. We show that when including the magnetic field effects, isotropization is achieved faster. |
2112.13436 | Alessandro Pilloni | JPAC Collaboration: Miguel Albaladejo, Lukasz Bibrzycki, Sebastian M.
Dawid, Cesar Fernandez-Ramirez, Sergi Gonzalez-Solis, Astrid N. Hiller Blin,
Andrew W. Jackura, Vincent Mathieu, Mikhail Mikhasenko, Victor I. Mokeev,
Emilie Passemar, Alessandro Pilloni, Arkaitz Rodas, Jorge A. Silva-Castro,
Wyatt A. Smith, Adam P. Szczepaniak, Daniel Winney | Novel approaches in Hadron Spectroscopy | 98 pages, 58 figures. To appear in Progress in Particle and Nuclear
Physics | Prog. Part. Nucl. Phys. 127 (2022) 103981 | 10.1016/j.ppnp.2022.103981 | LA-UR-21-31664, JLAB-THY-22-3459 | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The last two decades have witnessed the discovery of a myriad of new and
unexpected hadrons. The future holds more surprises for us, thanks to
new-generation experiments. Understanding the signals and determining the
properties of the states requires a parallel theoretical effort. To make full
use of available and forthcoming data, a careful amplitude modeling is
required, together with a sound treatment of the statistical uncertainties, and
a systematic survey of the model dependencies. We review the contributions made
by the Joint Physics Analysis Center to the field of hadron spectroscopy.
| [
{
"created": "Sun, 26 Dec 2021 18:53:14 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jul 2022 13:00:38 GMT",
"version": "v2"
}
] | 2022-10-24 | [
[
"JPAC Collaboration",
"",
""
],
[
"Albaladejo",
"Miguel",
""
],
[
"Bibrzycki",
"Lukasz",
""
],
[
"Dawid",
"Sebastian M.",
""
],
[
"Fernandez-Ramirez",
"Cesar",
""
],
[
"Gonzalez-Solis",
"Sergi",
""
],
[
"Blin",
... | The last two decades have witnessed the discovery of a myriad of new and unexpected hadrons. The future holds more surprises for us, thanks to new-generation experiments. Understanding the signals and determining the properties of the states requires a parallel theoretical effort. To make full use of available and forthcoming data, a careful amplitude modeling is required, together with a sound treatment of the statistical uncertainties, and a systematic survey of the model dependencies. We review the contributions made by the Joint Physics Analysis Center to the field of hadron spectroscopy. |
1209.2716 | Roman Kogler | M. Baak, M. Goebel, J. Haller, A. Hoecker, D. Kennedy, R. Kogler, K.
Moenig, M. Schott, J. Stelzer | The Electroweak Fit of the Standard Model after the Discovery of a New
Boson at the LHC | 11 pages, 5 figures, version submitted to EPJ-C | Eur. Phys. J. C72 (2012) 2205 | 10.1140/epjc/s10052-012-2205-9 | DESY-12-154 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In view of the discovery of a new boson by the ATLAS and CMS Collaborations
at the LHC, we present an update of the global Standard Model (SM) fit to
electroweak precision data. Assuming the new particle to be the SM Higgs boson,
all fundamental parameters of the SM are known allowing, for the first time, to
overconstrain the SM at the electroweak scale and assert its validity.
Including the effects of radiative corrections and the experimental and
theoretical uncertainties, the global fit exhibits a p-value of 0.07. The mass
measurements by ATLAS and CMS agree within 1.3sigma with the indirect
determination M_H=(94 +25 -22) GeV. Within the SM the W boson mass and the
effective weak mixing angle can be accurately predicted to be M_W=(80.359 +-
0.011) GeV and sin^2(theta_eff^ell)=(0.23150 +- 0.00010) from the global fit.
These results are compatible with, and exceed in precision, the direct
measurements. For the indirect determination of the top quark mass we find
m_t=(175.8 +2.7 -2.4) GeV, in agreement with the kinematic and cross-section
based measurements.
| [
{
"created": "Wed, 12 Sep 2012 20:15:26 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2012 11:58:48 GMT",
"version": "v2"
}
] | 2013-06-05 | [
[
"Baak",
"M.",
""
],
[
"Goebel",
"M.",
""
],
[
"Haller",
"J.",
""
],
[
"Hoecker",
"A.",
""
],
[
"Kennedy",
"D.",
""
],
[
"Kogler",
"R.",
""
],
[
"Moenig",
"K.",
""
],
[
"Schott",
"M.",
""
]... | In view of the discovery of a new boson by the ATLAS and CMS Collaborations at the LHC, we present an update of the global Standard Model (SM) fit to electroweak precision data. Assuming the new particle to be the SM Higgs boson, all fundamental parameters of the SM are known allowing, for the first time, to overconstrain the SM at the electroweak scale and assert its validity. Including the effects of radiative corrections and the experimental and theoretical uncertainties, the global fit exhibits a p-value of 0.07. The mass measurements by ATLAS and CMS agree within 1.3sigma with the indirect determination M_H=(94 +25 -22) GeV. Within the SM the W boson mass and the effective weak mixing angle can be accurately predicted to be M_W=(80.359 +- 0.011) GeV and sin^2(theta_eff^ell)=(0.23150 +- 0.00010) from the global fit. These results are compatible with, and exceed in precision, the direct measurements. For the indirect determination of the top quark mass we find m_t=(175.8 +2.7 -2.4) GeV, in agreement with the kinematic and cross-section based measurements. |
hep-ph/9904474 | Bernabeu | J. Bernabeu | CP, T Violation in Neutrino Oscillations | Proc. Weak Interactions and Neutrinos WIN'99 | null | null | FTUV/99-28 | hep-ph | null | The manifestation of CP, T violation in the leptonic sector is studied for
flavour neutrino oscillations, both in vacuum and in matter. Different
conditions of short-base-line versus long-base-line experiments are discussed.
| [
{
"created": "Wed, 28 Apr 1999 10:50:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bernabeu",
"J.",
""
]
] | The manifestation of CP, T violation in the leptonic sector is studied for flavour neutrino oscillations, both in vacuum and in matter. Different conditions of short-base-line versus long-base-line experiments are discussed. |
1811.01982 | Vicent Mateu | Vicent Mateu, Pablo G. Ortega, David R. Entem and Francisco Fernandez | Calibrating the Na\"ive Cornell Model with NRQCD | 22 pages, 13 figures, 3 tables | Eur. Phys. J. C (2019) 79:323 | 10.1140/epjc/s10052-019-6808-2 | IFT-UAM/CSIC-18-109 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Along the years, the Cornell Model has been extraordinarily successful in
describing hadronic phenomenology, in particular in physical situations for
which an effective theory of the strong interactions such as NRQCD cannot be
applied. As a consequence of its achievements, a relevant question is whether
its model parameters can somehow be related to fundamental constants of QCD. We
shall give a first answer in this article by comparing the predictions of both
approaches. Building on results from a previous study on heavy meson
spectroscopy, we calibrate the Cornell model employing NRQCD predictions for
the lowest-lying bottomonium states up to N$^3$LO, in which the bottom mass is
varied within a wide range. We find that the Cornell model mass parameter can
be identified, within perturbative uncertainties, with the MSR mass at the
scale $R = 1\,$GeV. This identification holds for any value of $\alpha_s$ or
the bottom mass, and for all perturbative orders investigated. Furthermore, we
show that: a) the "string tension" parameter is independent of the bottom mass,
and b) the Coulomb strength $\kappa$ of the Cornell model can be related to the
QCD strong coupling constant $\alpha_s$ at a characteristic non-relativistic
scale. We also show how to remove the $u=1/2$ renormalon of the static QCD
potential and sum-up large logs related to the renormalon subtraction by
switching to the low-scale, short-distance MSR mass, and using R-evolution. Our
R-improved expression for the static potential remains independent of the heavy
quark mass value and agrees with lattice QCD results for values of the radius
as large as $0.8\,$fm, and with the Cornell model potential at long distances.
Finally we show that for moderate values of $r$, the R-improved NRQCD and
Cornell static potentials are in head-on agreement.
| [
{
"created": "Mon, 5 Nov 2018 19:03:16 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 2019 10:03:29 GMT",
"version": "v2"
}
] | 2019-04-26 | [
[
"Mateu",
"Vicent",
""
],
[
"Ortega",
"Pablo G.",
""
],
[
"Entem",
"David R.",
""
],
[
"Fernandez",
"Francisco",
""
]
] | Along the years, the Cornell Model has been extraordinarily successful in describing hadronic phenomenology, in particular in physical situations for which an effective theory of the strong interactions such as NRQCD cannot be applied. As a consequence of its achievements, a relevant question is whether its model parameters can somehow be related to fundamental constants of QCD. We shall give a first answer in this article by comparing the predictions of both approaches. Building on results from a previous study on heavy meson spectroscopy, we calibrate the Cornell model employing NRQCD predictions for the lowest-lying bottomonium states up to N$^3$LO, in which the bottom mass is varied within a wide range. We find that the Cornell model mass parameter can be identified, within perturbative uncertainties, with the MSR mass at the scale $R = 1\,$GeV. This identification holds for any value of $\alpha_s$ or the bottom mass, and for all perturbative orders investigated. Furthermore, we show that: a) the "string tension" parameter is independent of the bottom mass, and b) the Coulomb strength $\kappa$ of the Cornell model can be related to the QCD strong coupling constant $\alpha_s$ at a characteristic non-relativistic scale. We also show how to remove the $u=1/2$ renormalon of the static QCD potential and sum-up large logs related to the renormalon subtraction by switching to the low-scale, short-distance MSR mass, and using R-evolution. Our R-improved expression for the static potential remains independent of the heavy quark mass value and agrees with lattice QCD results for values of the radius as large as $0.8\,$fm, and with the Cornell model potential at long distances. Finally we show that for moderate values of $r$, the R-improved NRQCD and Cornell static potentials are in head-on agreement. |
hep-ph/0608103 | Ted Barnes | T.Barnes (1 and 2) ((1) Physics Division, Oak Ridge National
Laboratory, (2) Dept. of Physics and Astronomy, Univ. of Tennessee) | The XYZs of Charmonium at BES | 5 pages, 1 eps figure. Invited contribution to the International
Workshop on Tau-Charm Physics Charm2006 (5-7 June 2006, Beijing, China) | Int.J.Mod.Phys. A21 (2006) 5583-5591 | 10.1142/S0217751X0603477X | null | hep-ph nucl-th | null | This contribution reviews some recent developments in charmonium
spectroscopy, and discusses related theoretical predictions. The spectrum of
states, strong decays of states above open charm threshold, electromagnetic
transitions, and issues related to the recent discoveries of the "XYZ" states
are discussed. Contributions that BES can make to our understanding of
charmonium and related states are stressed in particular.
| [
{
"created": "Wed, 9 Aug 2006 20:09:32 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Barnes",
"T.",
"",
"1 and 2"
]
] | This contribution reviews some recent developments in charmonium spectroscopy, and discusses related theoretical predictions. The spectrum of states, strong decays of states above open charm threshold, electromagnetic transitions, and issues related to the recent discoveries of the "XYZ" states are discussed. Contributions that BES can make to our understanding of charmonium and related states are stressed in particular. |
1811.06461 | Yannick Ulrich | T. Engel, C. Gnendiger, A. Signer, Y. Ulrich | Small-mass effects in heavy-to-light form factors | 20 pages, 4 figures, 1 ancillary file, published version | J. High Energ. Phys. (2019) 2019: 118 | 10.1007/JHEP02(2019)118 | PSI-PR-18-13, ZU-TH 40/18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the heavy-to-light form factors with two different non-vanishing
masses at next-to-next-to-leading order and study its expansion in the small
mass. The leading term of this small-mass expansion leads to a factorized
expression for the form factor. The presence of a second mass results in a new
feature, in that the soft contribution develops a factorization anomaly. This
cancels with the corresponding anomaly in the collinear contribution. With the
generalized factorization presented here, it is possible to obtain the leading
small-mass terms for processes with large masses, such as muon-electron
scattering, from the corresponding massless amplitude and the soft
contribution.
| [
{
"created": "Thu, 15 Nov 2018 16:52:18 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Mar 2019 10:45:28 GMT",
"version": "v2"
}
] | 2019-03-15 | [
[
"Engel",
"T.",
""
],
[
"Gnendiger",
"C.",
""
],
[
"Signer",
"A.",
""
],
[
"Ulrich",
"Y.",
""
]
] | We present the heavy-to-light form factors with two different non-vanishing masses at next-to-next-to-leading order and study its expansion in the small mass. The leading term of this small-mass expansion leads to a factorized expression for the form factor. The presence of a second mass results in a new feature, in that the soft contribution develops a factorization anomaly. This cancels with the corresponding anomaly in the collinear contribution. With the generalized factorization presented here, it is possible to obtain the leading small-mass terms for processes with large masses, such as muon-electron scattering, from the corresponding massless amplitude and the soft contribution. |
hep-ph/0104290 | Alexander Bakulev | A. P. Bakulev, S. V. Mikhailov, N. G. Stefanis | On a QCD-based pion distribution amplitude vs. recent experimental data | 4 pages in moriond style; 1 photo and 2 figures unite 7 EPS files; to
appear in Proc. of XXXIVth Rencontres de Moriond "QCD and High Energy
Hadronic Interactions", March 17 to 24, 2001, Les Arcs, Savoie, France | Conf.Proc.C010317:133-136,2002 | null | RUB-TPII-04/01 | hep-ph | null | Using QCD sum rules with nonlocal condensates the twist-2 pion distribution
amplitude is determined by means of its moments and their confidence intervals,
including also radiative corrections. An admissible set of pion distribution
amplitudes is constructed in the a_2, a_4 plane of the Gegenbauer polynomial
expansion coefficients. The determined a_2, a_4 region strongly overlaps with
that extracted from the CLEO data by Schmedding and Yakovlev. Comparisons are
given with results from Fermilab experiment E791 and recent lattice
calculations.
| [
{
"created": "Fri, 27 Apr 2001 16:20:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bakulev",
"A. P.",
""
],
[
"Mikhailov",
"S. V.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | Using QCD sum rules with nonlocal condensates the twist-2 pion distribution amplitude is determined by means of its moments and their confidence intervals, including also radiative corrections. An admissible set of pion distribution amplitudes is constructed in the a_2, a_4 plane of the Gegenbauer polynomial expansion coefficients. The determined a_2, a_4 region strongly overlaps with that extracted from the CLEO data by Schmedding and Yakovlev. Comparisons are given with results from Fermilab experiment E791 and recent lattice calculations. |
1710.03377 | Digesh Raut | Arindam Das, Nobuchika Okada, and Digesh Raut | Enhanced pair production of heavy Majorana neutrinos at LHC | 10 pages, 2 figures, revised version (discussion extended, Figure 1
revised, typos corrected, new references added) | Phys. Rev. D 97, 115023 (2018) | 10.1103/PhysRevD.97.115023 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Towards experimental confirmations of the type-I seesaw mechanism, we explore
a prospect of discovering the heavy Majorana right-handed neutrinos (RHNs) from
a resonant production of a new massive gauge boson ($Z^{\prime}$) and its
subsequent decay into a pair of RHNs ($Z^{\prime}\to NN$) at the future LHC.
Recent simulation studies have shown that the discovery of the RHNs through
this process is promising in the future. However, the current LHC data very
severely constrains the production cross section of the $Z^{\prime}$ boson into
a dilepton final states, $pp \to Z^{\prime}\to \ell^{+}\ell^{-} $ ($\ell=e$ or
$\mu$). Extrapolating the current bound to the future, we find that a
significant enhancement of the branching ratio ${\rm BR}(Z^{\prime}\to NN$)
over ${\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}$) is necessary for the future
discovery of RHNs. As a well-motivated simple extension of the Standard Model
(SM) to incorporate the $Z^\prime$ boson and the type-I seesaw mechanism, we
consider the minimal U(1)$_X$ model. We point out that this model can yield a
significant enhancement up to ${\rm BR}(Z^{\prime}\to NN)/{\rm
BR}(Z^{\prime}\to \ell^{+}\ell^{-}) \simeq 5$ (per generation). This is in
sharp contrast with the minimal $B-L$ model, a benchmark scenario commonly used
in simulation studies, which predicts ${\rm BR}(Z^{\prime}\to NN)/{\rm
BR}(Z^{\prime}\to \ell^{+}\ell^{-}) \simeq 0.5$ (per generation). With such an
enhancement and a realistic model-parameter choice to reproduce the neutrino
oscillation data, we conclude that the possibility of discovering RHNs with a
$300 \; {\rm fb}^{-1}$ luminosity implies that the $Z^\prime$ boson will be
discovered with a luminosity of $170.5 \;{\rm fb}^{-1}$ ($125 \; {\rm
fb}^{-1}$) for the normal (inverted) hierarchy of the light neutrino mass
pattern.
| [
{
"created": "Tue, 10 Oct 2017 02:12:24 GMT",
"version": "v1"
},
{
"created": "Tue, 1 May 2018 02:44:34 GMT",
"version": "v2"
}
] | 2018-06-20 | [
[
"Das",
"Arindam",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Raut",
"Digesh",
""
]
] | Towards experimental confirmations of the type-I seesaw mechanism, we explore a prospect of discovering the heavy Majorana right-handed neutrinos (RHNs) from a resonant production of a new massive gauge boson ($Z^{\prime}$) and its subsequent decay into a pair of RHNs ($Z^{\prime}\to NN$) at the future LHC. Recent simulation studies have shown that the discovery of the RHNs through this process is promising in the future. However, the current LHC data very severely constrains the production cross section of the $Z^{\prime}$ boson into a dilepton final states, $pp \to Z^{\prime}\to \ell^{+}\ell^{-} $ ($\ell=e$ or $\mu$). Extrapolating the current bound to the future, we find that a significant enhancement of the branching ratio ${\rm BR}(Z^{\prime}\to NN$) over ${\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}$) is necessary for the future discovery of RHNs. As a well-motivated simple extension of the Standard Model (SM) to incorporate the $Z^\prime$ boson and the type-I seesaw mechanism, we consider the minimal U(1)$_X$ model. We point out that this model can yield a significant enhancement up to ${\rm BR}(Z^{\prime}\to NN)/{\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}) \simeq 5$ (per generation). This is in sharp contrast with the minimal $B-L$ model, a benchmark scenario commonly used in simulation studies, which predicts ${\rm BR}(Z^{\prime}\to NN)/{\rm BR}(Z^{\prime}\to \ell^{+}\ell^{-}) \simeq 0.5$ (per generation). With such an enhancement and a realistic model-parameter choice to reproduce the neutrino oscillation data, we conclude that the possibility of discovering RHNs with a $300 \; {\rm fb}^{-1}$ luminosity implies that the $Z^\prime$ boson will be discovered with a luminosity of $170.5 \;{\rm fb}^{-1}$ ($125 \; {\rm fb}^{-1}$) for the normal (inverted) hierarchy of the light neutrino mass pattern. |
2111.03645 | Shinsuke Kawai | Shinsuke Kawai, Nobuchika Okada | Gravitino constraints on supergravity inflation | 5 pages, 2 figures. v3: correction in Fig.2 caption | PRD 105 (2022) L101302 | 10.1103/PhysRevD.105.L101302 | null | hep-ph astro-ph.CO hep-ex hep-th | http://creativecommons.org/licenses/by/4.0/ | Supergravity embedding of the Standard Model of particle physics provides
phenomenologically well-motivated and observationally viable inflationary
scenarios. We investigate a class of inflationary models based on the
superconformal framework of supergravity and discuss constraints from the
reheating temperature, with the particular focus on the gravitino problem
inherent in these scenarios. We point out that a large part of the parameter
space within the latest BICEP/Keck 95\% confidence contour may have been
excluded by the gravitino constraints, depending on the mass scale of the
inflaton. Precision measurements of the scalar spectral index by a future
mission may rule out some of these scenarios conclusively.
| [
{
"created": "Fri, 5 Nov 2021 17:54:31 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2022 14:44:08 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Mar 2023 09:21:52 GMT",
"version": "v3"
}
] | 2023-03-02 | [
[
"Kawai",
"Shinsuke",
""
],
[
"Okada",
"Nobuchika",
""
]
] | Supergravity embedding of the Standard Model of particle physics provides phenomenologically well-motivated and observationally viable inflationary scenarios. We investigate a class of inflationary models based on the superconformal framework of supergravity and discuss constraints from the reheating temperature, with the particular focus on the gravitino problem inherent in these scenarios. We point out that a large part of the parameter space within the latest BICEP/Keck 95\% confidence contour may have been excluded by the gravitino constraints, depending on the mass scale of the inflaton. Precision measurements of the scalar spectral index by a future mission may rule out some of these scenarios conclusively. |
1006.2372 | Joachim Kopp | Boris Kayser, Joachim Kopp (Fermilab), R. G. Hamish Robertson (U of
Washington), Petr Vogel (Caltech) | On a theory of neutrino oscillations with entanglement | RevTeX 4, 12 pages, 1 figure; v2: Minor clarifications, references
added | Phys.Rev.D82:093003,2010 | 10.1103/PhysRevD.82.093003 | FERMILAB-PUB-10-194-T | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, despite appearances, a theoretical approach to neutrino
oscillation in which the neutrino and its interaction partners are entangled
yields the standard result for the neutrino oscillation wavelength. We also
shed some light on the question of why plane-wave approaches to the neutrino
oscillation problem can yield the correct oscillation wavelength even though
they do not explicitly account for the localization of the neutrino source and
the detector.
| [
{
"created": "Fri, 11 Jun 2010 19:36:43 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Nov 2010 17:16:21 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Kayser",
"Boris",
"",
"Fermilab"
],
[
"Kopp",
"Joachim",
"",
"Fermilab"
],
[
"Robertson",
"R. G. Hamish",
"",
"U of\n Washington"
],
[
"Vogel",
"Petr",
"",
"Caltech"
]
] | We show that, despite appearances, a theoretical approach to neutrino oscillation in which the neutrino and its interaction partners are entangled yields the standard result for the neutrino oscillation wavelength. We also shed some light on the question of why plane-wave approaches to the neutrino oscillation problem can yield the correct oscillation wavelength even though they do not explicitly account for the localization of the neutrino source and the detector. |
hep-ph/9601226 | Xuan-Yem Pham | X. Y. Pham and M. Gourdin | A new CP violation mechanism generated by the standard neutral Higgs
boson : the $\eta \to \pi + \pi $ case | 9 pages (Latex), 3 figures | Phys.Lett. B385 (1996) 231-236; Erratum-ibid. B390 (1997) 451 | 10.1016/0370-2693(96)00891-X | LPTHE/PAR/96-01 | hep-ph | null | Strictly within the standard electro-weak interaction, CP violation in the
flavour conserving process $\eta \rightarrow \pi + \pi $ could originate from
the mixing of the $\eta$ meson with the virtual scalar Higgs boson $ H^{0}$ via
$W$ and top quark exchange. The parity-violation carried by weak gauge bosons
makes the mixing possible by quantum effect at two-loop level. Nowhere the
Kobayashi-Maskawa (KM) phase mechanism is needed. The phenomenon reveals an
unexpected new role of the Higgs boson in the CP symmetry breaking. For the
Higgs mass between 100-600 GeV, the $\eta \rightarrow \pi +\pi $ branching
ratio is found to be $3.6 \cdot 10^{-26} - 2.4 \cdot 10^{-29}$ , hence CP
violation mechanisms beyond the Standard Model are the only ones that could
give rise to its observation at existing or near future $\eta$ factories,
unless the Higgs mass is improbably as light as 550 $MeV$.
| [
{
"created": "Mon, 8 Jan 1996 16:30:16 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jan 1996 17:24:51 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Jun 1996 16:59:07 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Pham",
"X. Y.",
""
],
[
"Gourdin",
"M.",
""
]
] | Strictly within the standard electro-weak interaction, CP violation in the flavour conserving process $\eta \rightarrow \pi + \pi $ could originate from the mixing of the $\eta$ meson with the virtual scalar Higgs boson $ H^{0}$ via $W$ and top quark exchange. The parity-violation carried by weak gauge bosons makes the mixing possible by quantum effect at two-loop level. Nowhere the Kobayashi-Maskawa (KM) phase mechanism is needed. The phenomenon reveals an unexpected new role of the Higgs boson in the CP symmetry breaking. For the Higgs mass between 100-600 GeV, the $\eta \rightarrow \pi +\pi $ branching ratio is found to be $3.6 \cdot 10^{-26} - 2.4 \cdot 10^{-29}$ , hence CP violation mechanisms beyond the Standard Model are the only ones that could give rise to its observation at existing or near future $\eta$ factories, unless the Higgs mass is improbably as light as 550 $MeV$. |
hep-ph/0510063 | Pierpaolo Mastrolia | Pierpaolo Mastrolia (UCLA) | CSW Diagrams and Electroweak Vector Bosons | 8 pages, 2 figures, Talk given at the workshop QCD at Work 2005,
Conversano (BA), Italy, June 16-20, 2005 | null | 10.1063/1.2163750 | UCLA/05/TEP/28 | hep-ph | null | Based on the joined work performed together with Z. Bern, D. Forde, and D.
Kosower [1], in this talk it is recalled the (twistor-motivated) diagrammatic
formalism describing tree-level scattering amplitudes presented by Cachazo,
Svr\v{c}ek and Witten, and it is discussed an extension of the vertices and
accompaining rules to the construction of vector-boson currents coupling to an
arbitrary source.
| [
{
"created": "Wed, 5 Oct 2005 19:01:50 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Mastrolia",
"Pierpaolo",
"",
"UCLA"
]
] | Based on the joined work performed together with Z. Bern, D. Forde, and D. Kosower [1], in this talk it is recalled the (twistor-motivated) diagrammatic formalism describing tree-level scattering amplitudes presented by Cachazo, Svr\v{c}ek and Witten, and it is discussed an extension of the vertices and accompaining rules to the construction of vector-boson currents coupling to an arbitrary source. |
hep-ph/9809257 | Antti Keranen | A. Keranen, J. Cleymans and E. Suhonen | On the exact conservation laws in thermal models and the analysis of AGS
and SIS experimental results | Talk given at Strangeness in Quark Matter '98, Padova, Italy (1998).
Submitted to J.Phys. G. 5 pages, 2 figures | J.Phys.G25:275-280,1999 | 10.1088/0954-3899/25/2/015 | null | hep-ph | null | The production of hadrons in relativistic heavy ion collisions is studied
using a statistical ensemble with thermal and chemical equilibrium. Special
attention is given to exact conservation laws, i.e. certain charges are treated
canonically instead of using the usual grand canonical approach. For small
systems, the exact conservation of baryon number, strangeness and electric
charge is to be taken into account. We have derived compact, analytical
expressions for particle abundances in such ensemble. As an application, the
change in $K/\pi$ ratios in AGS experiments with different interaction system
sizes is well reproduced. The canonical treatment of three charges becomes
impractical very quickly with increasing system size. Thus, we draw our
attention to exact conservation of strangeness, and treat baryon number and
electric charge grand canonically. We present expressions for particle
abundances in such ensemble as well, and apply them to reproduce the large
variety of particle ratios in GSI SIS 2 A GeV Ni-Ni experiments. At the
energies considered here, the exact strangeness conservation fully accounts for
strange particle suppression, and no extra chemical factor is needed.
| [
{
"created": "Fri, 4 Sep 1998 08:48:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Keranen",
"A.",
""
],
[
"Cleymans",
"J.",
""
],
[
"Suhonen",
"E.",
""
]
] | The production of hadrons in relativistic heavy ion collisions is studied using a statistical ensemble with thermal and chemical equilibrium. Special attention is given to exact conservation laws, i.e. certain charges are treated canonically instead of using the usual grand canonical approach. For small systems, the exact conservation of baryon number, strangeness and electric charge is to be taken into account. We have derived compact, analytical expressions for particle abundances in such ensemble. As an application, the change in $K/\pi$ ratios in AGS experiments with different interaction system sizes is well reproduced. The canonical treatment of three charges becomes impractical very quickly with increasing system size. Thus, we draw our attention to exact conservation of strangeness, and treat baryon number and electric charge grand canonically. We present expressions for particle abundances in such ensemble as well, and apply them to reproduce the large variety of particle ratios in GSI SIS 2 A GeV Ni-Ni experiments. At the energies considered here, the exact strangeness conservation fully accounts for strange particle suppression, and no extra chemical factor is needed. |
1009.3365 | Helen Matskevich | S.M. Gerasyuta and E.E. Matskevich | Nonstrange baryonia | 28 pages, latex | Int.J.Mod.Phys.E20:1419-1436,2011 | 10.1142/S0218301311018502 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic six-quark equations including the $u$, $d$ quarks and
antiquarks are found. The nonstrange baryonia $B \bar B$ are constructed
without the mixing of the quarks and antiquarks. The relativistic six-quark
amplitudes of the baryonia are calculated. The poles of these amplitudes
determine the masses of baryonia. 15 masses of baryonia are predicted. The mass
of baryonium with the spin-parity $J^P=0^-$ $M=1835\, MeV$ is used as a fit.
| [
{
"created": "Fri, 17 Sep 2010 08:26:21 GMT",
"version": "v1"
}
] | 2011-07-15 | [
[
"Gerasyuta",
"S. M.",
""
],
[
"Matskevich",
"E. E.",
""
]
] | The relativistic six-quark equations including the $u$, $d$ quarks and antiquarks are found. The nonstrange baryonia $B \bar B$ are constructed without the mixing of the quarks and antiquarks. The relativistic six-quark amplitudes of the baryonia are calculated. The poles of these amplitudes determine the masses of baryonia. 15 masses of baryonia are predicted. The mass of baryonium with the spin-parity $J^P=0^-$ $M=1835\, MeV$ is used as a fit. |
hep-ph/0312204 | Lokhtin | I.P. Lokhtin and A.M. Snigirev | Fast simulation of flow effects in central and semi-central heavy ion
collisions at LHC | 6 pages, LaTeX | null | null | SINP MSU 2004-14/753 | hep-ph | null | The simple method for simulation of ``thermal'' hadron spectra in
ultrarelativistic heavy ion collisions including longitudinal, transverse and
elliptic flow is developed. The model is realized as fast Monte-Carlo event
generator.
| [
{
"created": "Tue, 16 Dec 2003 10:12:37 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2004 14:02:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Lokhtin",
"I. P.",
""
],
[
"Snigirev",
"A. M.",
""
]
] | The simple method for simulation of ``thermal'' hadron spectra in ultrarelativistic heavy ion collisions including longitudinal, transverse and elliptic flow is developed. The model is realized as fast Monte-Carlo event generator. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.