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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2404.03896 | Eric S. Swanson | Nils H\"usken, Richard F. Lebed, Ryan E. Mitchell, Eric S. Swanson,
Ya-Qian Wang, Chang-Zheng Yuan | Poles and Poltergeists in $e^+ e^- \to D \bar D$ Data | Discussion of previous work updated. 9 pages, 8 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | A recent report of $e^+ e^- \to D\bar D$ events by the BESIII Collaboration
suggests the presence of a structure $R$ at 3900~MeV\@. We argue that this
structure, called $G(3900)$ in the past, is not in fact due to a new $c\bar c$
resonance, but rather naturally emerges as a threshold enhancement due to the
opening of the $D^*\bar D$ channel. We further find that the appearance of this
structure does not require suppression because of a radial node in the
$\psi(4040)$ wave function, although a node improves fit quality. The measured
$e^+ e^-$ coupling of $\psi(4040)$ is found to be substantially smaller than
previously estimated. In addition, we report new corrections to the measured
cross section $\sigma(e^+ e^- \to D\bar D)$ at energies near $\psi(3770)$.
| [
{
"created": "Fri, 5 Apr 2024 05:21:50 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Apr 2024 16:50:19 GMT",
"version": "v2"
}
] | 2024-04-16 | [
[
"Hüsken",
"Nils",
""
],
[
"Lebed",
"Richard F.",
""
],
[
"Mitchell",
"Ryan E.",
""
],
[
"Swanson",
"Eric S.",
""
],
[
"Wang",
"Ya-Qian",
""
],
[
"Yuan",
"Chang-Zheng",
""
]
] | A recent report of $e^+ e^- \to D\bar D$ events by the BESIII Collaboration suggests the presence of a structure $R$ at 3900~MeV\@. We argue that this structure, called $G(3900)$ in the past, is not in fact due to a new $c\bar c$ resonance, but rather naturally emerges as a threshold enhancement due to the opening of the $D^*\bar D$ channel. We further find that the appearance of this structure does not require suppression because of a radial node in the $\psi(4040)$ wave function, although a node improves fit quality. The measured $e^+ e^-$ coupling of $\psi(4040)$ is found to be substantially smaller than previously estimated. In addition, we report new corrections to the measured cross section $\sigma(e^+ e^- \to D\bar D)$ at energies near $\psi(3770)$. |
2212.08793 | Yoon Chan Taak | Yoon Chan Taak, Tommaso Treu, Yoshiyuki Inoue, and Alexander Kusenko | Strong Lensing of High-Energy Neutrinos | 11 pages, 4 figures. Accepted for publication in Physical Review D | null | 10.1103/PhysRevD.107.023011 | IPMU22-0067, RIKEN-iTHEMS-Report-22 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the effects of strong gravitational lensing by galaxy-scale
deflectors on the observations of high-energy (E$\gg$GeV) neutrinos (HEN). For
HEN at cosmological distances, the optical depth for multiple imaging is $\sim
10^{-3}$, implying that while we do not expect any multiply imaged HEN with
present samples, next-generation experiments should be able to detect the first
such event. We then present the distribution of expected time delays to aid in
the identification of such events, in combination with directional and energy
information. In order to assist in the evaluation of HEN production mechanisms,
we illustrate how lensing affects the observed number counts for a variety of
intrinsic luminosity functions of the source population. Finally, we see that
the lensing effects on the cosmic neutrino background flux calculation would be
negligible by taking kpc-scale jets as an example.
| [
{
"created": "Sat, 17 Dec 2022 03:58:02 GMT",
"version": "v1"
}
] | 2023-02-01 | [
[
"Taak",
"Yoon Chan",
""
],
[
"Treu",
"Tommaso",
""
],
[
"Inoue",
"Yoshiyuki",
""
],
[
"Kusenko",
"Alexander",
""
]
] | We consider the effects of strong gravitational lensing by galaxy-scale deflectors on the observations of high-energy (E$\gg$GeV) neutrinos (HEN). For HEN at cosmological distances, the optical depth for multiple imaging is $\sim 10^{-3}$, implying that while we do not expect any multiply imaged HEN with present samples, next-generation experiments should be able to detect the first such event. We then present the distribution of expected time delays to aid in the identification of such events, in combination with directional and energy information. In order to assist in the evaluation of HEN production mechanisms, we illustrate how lensing affects the observed number counts for a variety of intrinsic luminosity functions of the source population. Finally, we see that the lensing effects on the cosmic neutrino background flux calculation would be negligible by taking kpc-scale jets as an example. |
hep-ph/0504256 | Jan Kalinowski | Wojciech Krolikowski | Intrinsically acting Pauli principle as the origin of three Standard
Model generations of leptons and quarks | 1+10 pages, LaTeX, no figures | null | null | IFT-05/10 | hep-ph | null | We turn back to the hypothesis that the Pauli principle, acting intrinsically
within leptons and quarks, is the origin of their three generations. The
adequate formalism is based on the generalized Dirac equations arising (in the
interaction-free case) from the Klein-Gordon equations through the familiar
squared-root procedure (but applied in the generic way). This leads to the
existence of {\it additional} Dirac bispinor indices decoupled from the
Standard Model gauge fields, thus nonobserved in these fields and, in
consequence, {\it not distinguishable} from each other. They are treated as
dynamical degrees of freedom obeying the Pauli principle along with Fermi
statistics. Then, they produce within leptons and quarks the total additional
spin equal to zero, and cause the existence of {\it three and only three}
generations of Standard Model leptons and quarks. In the second part of the
note we discuss the role of the new generation-weighting factors in building up
the spectra of charged leptons and neutrinos.
| [
{
"created": "Wed, 27 Apr 2005 09:56:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krolikowski",
"Wojciech",
""
]
] | We turn back to the hypothesis that the Pauli principle, acting intrinsically within leptons and quarks, is the origin of their three generations. The adequate formalism is based on the generalized Dirac equations arising (in the interaction-free case) from the Klein-Gordon equations through the familiar squared-root procedure (but applied in the generic way). This leads to the existence of {\it additional} Dirac bispinor indices decoupled from the Standard Model gauge fields, thus nonobserved in these fields and, in consequence, {\it not distinguishable} from each other. They are treated as dynamical degrees of freedom obeying the Pauli principle along with Fermi statistics. Then, they produce within leptons and quarks the total additional spin equal to zero, and cause the existence of {\it three and only three} generations of Standard Model leptons and quarks. In the second part of the note we discuss the role of the new generation-weighting factors in building up the spectra of charged leptons and neutrinos. |
2312.09879 | Anuvind Asokan | Anuvind Asokan | Employing Approximate Symmetries for Hidden Pole Extraction | The article is submitted for inclusion in the proceedings of the 20th
International Conference on Hadron Spectroscopy and Structure (HADRON 2023)
held in Genova, Italy, from June 5th to 9th 2023 | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent lattice analyses of the $D\pi$ scattering by Hadron Spectrum
Collaboration(HadSpec) report only one pole in the $D_0^*$ channel. This is in
odds with the unitarised chiral perturbation theory analyses, which predict the
$D_0^*(2300)$ as the interplay of two poles. We provide an explanation for this
contradiction $-$ the exsistence of a hidden pole. We further show that the
hidden pole can be better extracted from the lattice data by imposing SU(3)
flavour constraints on the fitting amplitudes.
| [
{
"created": "Fri, 15 Dec 2023 15:27:34 GMT",
"version": "v1"
}
] | 2023-12-18 | [
[
"Asokan",
"Anuvind",
""
]
] | Recent lattice analyses of the $D\pi$ scattering by Hadron Spectrum Collaboration(HadSpec) report only one pole in the $D_0^*$ channel. This is in odds with the unitarised chiral perturbation theory analyses, which predict the $D_0^*(2300)$ as the interplay of two poles. We provide an explanation for this contradiction $-$ the exsistence of a hidden pole. We further show that the hidden pole can be better extracted from the lattice data by imposing SU(3) flavour constraints on the fitting amplitudes. |
hep-ph/9510276 | John Collins | John Collins (Penn State) | The Problem Of Scales: Renormalization and All That | Lectures at TASI 95. Correction of signs in degree of divergence on
p. 4 | "Theoretical Advanced Study Institute in Elementary Particle
Physics, 1995: QCD and Beyond'', D.E. Soper, ed., (World Scientific
Singapore) | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I explain the methods that are used in field theory for problems involving
typical momenta on two or more widely disparate scales. The principal topics
are: (a) renormalization, which treats the problem of taking an ultra-violet
cut-off to infinity, (b) the renormalization group, which is used to relate
phenomena on different scales, (c) the operator product expansion, which shows
how to obtain the asymptotics of amplitudes when some of its external momenta
approach infinity.
| [
{
"created": "Wed, 11 Oct 1995 21:08:57 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 1995 22:47:33 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Feb 2009 14:42:39 GMT",
"version": "v3"
}
] | 2009-02-12 | [
[
"Collins",
"John",
"",
"Penn State"
]
] | I explain the methods that are used in field theory for problems involving typical momenta on two or more widely disparate scales. The principal topics are: (a) renormalization, which treats the problem of taking an ultra-violet cut-off to infinity, (b) the renormalization group, which is used to relate phenomena on different scales, (c) the operator product expansion, which shows how to obtain the asymptotics of amplitudes when some of its external momenta approach infinity. |
2205.09954 | Murray Moinester | Murray Moinester | Pion Polarizability 2022 Status Report | 11 pages, 4 figures, Expanded version of talk to be presented at the
2022 APS Fall DNP Oct. 27 - 30, 2022 meeting in New Orleans, to be published
as a review article. arXiv admin note: substantial text overlap with
arXiv:1709.05159 | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The electric ${\alpha}_{\pi}$ and magnetic ${\beta}_{\pi}$ charged pion
Compton polarizabilities are of fundamental interest in the low-energy sector
of quantum chromodynamics (QCD). They characterize the induced dipole moments
of the pion during ${\gamma}{\pi}$ Compton scattering. Pion polarizabilities
affect the shape of the ${\gamma}{\pi}$ Compton scattering angular
distribution.The combination $({\alpha}_{\pi} - {\beta}_{\pi})$ was measured
by: (1) CERN COMPASS via ${\pi} Z \rightarrow {\pi} Z {\gamma}$ radiative pion
Primakoff scattering in the nuclear Coulomb field, (2) SLAC PEP Mark-II via
two-photon production of pion pairs, ${\gamma} {\gamma} \rightarrow {\pi}^+
{\pi}^-$, and (3) Mainz Microtron MAMI via radiative pion photoproduction from
the proton, ${\gamma} p \rightarrow {\gamma} {\pi}^+ n$. Ongoing and planned
pion polarizability experiments (CERN COMPASS, BESIII at Beijing, JLab at
Newport News) are also described. The Mark-II pion polarizability 95%
confidence interval is approximately $0-11 \times 10^{-4} {fm}^{3}$, based on
$({\alpha}_{\pi} - {\beta}_{\pi}) = (4.4 \pm 3.2) \times 10^{-4} {fm}^{3}$. The
Mainz value $({\alpha}_{\pi} - {\beta}_{\pi}) = 11.6 \times 10^{-4} {fm}^{3}$
is excluded on the basis of a dispersion relations calculation which uses the
Mainz value as input, and gives significantly too large ${\gamma} {\gamma}
\rightarrow {\pi}^{0} {\pi}^{0}$ cross sections compared to DESY Crystal Ball
data. To date, only the COMPASS polarizability measurement has acceptably small
uncertainties. Its value $({\alpha}_{\pi} - {\beta}_{\pi}) = (4.0 \pm 1.8)
\times 10^{-4} {fm}^{3}$ agrees well with the two-loop ChPT prediction
$({\alpha}_{\pi} - {\beta}_{\pi}) = (5.7 \pm 1.0) \times 10^{-4} {fm}^{3}$,
thereby strengthening the identification of the pion with the Goldstone boson
of QCD.
| [
{
"created": "Fri, 20 May 2022 04:26:40 GMT",
"version": "v1"
}
] | 2022-05-23 | [
[
"Moinester",
"Murray",
""
]
] | The electric ${\alpha}_{\pi}$ and magnetic ${\beta}_{\pi}$ charged pion Compton polarizabilities are of fundamental interest in the low-energy sector of quantum chromodynamics (QCD). They characterize the induced dipole moments of the pion during ${\gamma}{\pi}$ Compton scattering. Pion polarizabilities affect the shape of the ${\gamma}{\pi}$ Compton scattering angular distribution.The combination $({\alpha}_{\pi} - {\beta}_{\pi})$ was measured by: (1) CERN COMPASS via ${\pi} Z \rightarrow {\pi} Z {\gamma}$ radiative pion Primakoff scattering in the nuclear Coulomb field, (2) SLAC PEP Mark-II via two-photon production of pion pairs, ${\gamma} {\gamma} \rightarrow {\pi}^+ {\pi}^-$, and (3) Mainz Microtron MAMI via radiative pion photoproduction from the proton, ${\gamma} p \rightarrow {\gamma} {\pi}^+ n$. Ongoing and planned pion polarizability experiments (CERN COMPASS, BESIII at Beijing, JLab at Newport News) are also described. The Mark-II pion polarizability 95% confidence interval is approximately $0-11 \times 10^{-4} {fm}^{3}$, based on $({\alpha}_{\pi} - {\beta}_{\pi}) = (4.4 \pm 3.2) \times 10^{-4} {fm}^{3}$. The Mainz value $({\alpha}_{\pi} - {\beta}_{\pi}) = 11.6 \times 10^{-4} {fm}^{3}$ is excluded on the basis of a dispersion relations calculation which uses the Mainz value as input, and gives significantly too large ${\gamma} {\gamma} \rightarrow {\pi}^{0} {\pi}^{0}$ cross sections compared to DESY Crystal Ball data. To date, only the COMPASS polarizability measurement has acceptably small uncertainties. Its value $({\alpha}_{\pi} - {\beta}_{\pi}) = (4.0 \pm 1.8) \times 10^{-4} {fm}^{3}$ agrees well with the two-loop ChPT prediction $({\alpha}_{\pi} - {\beta}_{\pi}) = (5.7 \pm 1.0) \times 10^{-4} {fm}^{3}$, thereby strengthening the identification of the pion with the Goldstone boson of QCD. |
1406.6215 | Vasilios Zarikas | Georgios Aliferis, Georgios Kofinas and Vasilios Zarikas | Efficient electroweak baryogenesis by black holes | 32 pages, to appear in Physical Review D | Phys. Rev. D 91, 045002 (2015) | 10.1103/PhysRevD.91.045002 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel cosmological scenario, capable to generate the observed baryon number
at the electroweak scale for very small CP violating angles, is presented. The
proposed mechanism can be applied in conventional FRW cosmology, but becomes
extremely efficient due to accretion in the context of early cosmic expansion
with high energy modifications. Assuming that our universe is a Randall-Sundrum
brane, baryon asymmetry can easily be produced by Hawking radiation of very
small primordial black holes. The Hawking radiation reheats a spherical region
around every black hole to a high temperature and the electroweak symmetry is
restored there. A domain wall is formed separating the region with the
symmetric vacuum from the asymmetric region where electroweak baryogenesis
takes place. First order phase transition is not needed. The black holes's
lifetime is prolonged due to accretion, resulting to strong efficiency of the
baryon producing mechanism. The allowed by the mechanism black hole mass range
includes masses that are energetically favoured to be produced from
interactions around the higher dimensional Planck scale.
| [
{
"created": "Tue, 24 Jun 2014 12:27:39 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Feb 2015 13:36:59 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Aliferis",
"Georgios",
""
],
[
"Kofinas",
"Georgios",
""
],
[
"Zarikas",
"Vasilios",
""
]
] | A novel cosmological scenario, capable to generate the observed baryon number at the electroweak scale for very small CP violating angles, is presented. The proposed mechanism can be applied in conventional FRW cosmology, but becomes extremely efficient due to accretion in the context of early cosmic expansion with high energy modifications. Assuming that our universe is a Randall-Sundrum brane, baryon asymmetry can easily be produced by Hawking radiation of very small primordial black holes. The Hawking radiation reheats a spherical region around every black hole to a high temperature and the electroweak symmetry is restored there. A domain wall is formed separating the region with the symmetric vacuum from the asymmetric region where electroweak baryogenesis takes place. First order phase transition is not needed. The black holes's lifetime is prolonged due to accretion, resulting to strong efficiency of the baryon producing mechanism. The allowed by the mechanism black hole mass range includes masses that are energetically favoured to be produced from interactions around the higher dimensional Planck scale. |
1111.0293 | Tongyan Lin | Tongyan Lin, Hai-Bo Yu, Kathryn M. Zurek | On Symmetric and Asymmetric Light Dark Matter | 21 pages, 6 figures; v2: journal version | null | 10.1103/PhysRevD.85.063503 | MCTP-11-36 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine cosmological, astrophysical and collider constraints on thermal
dark matter (DM) with mass mX in the range 1 MeV to 10 GeV. Cosmic microwave
background (CMB) observations, which severely constrain light symmetric DM, can
be evaded if the DM relic density is sufficiently asymmetric. CMB constraints
require the present anti-DM to DM ratio to be less than 2*10^{-6} (10^{-1}) for
DM mass mX = 1 MeV (10 GeV) with ionizing efficiency factor f ~ 1. We determine
the minimum annihilation cross section for achieving these asymmetries subject
to the relic density constraint; these cross sections are larger than the usual
thermal annihilation cross section. On account of collider constraints, such
annihilation cross sections can only be obtained by invoking light mediators.
These light mediators can give rise to significant DM self-interactions, and we
derive a lower bound on the mediator mass from elliptical DM halo shape
constraints. We find that halo shapes require a mediator with mass mphi > 4 *
10^{-2} MeV (40 MeV) for mX = 1 MeV (10 GeV). We map all of these constraints
to the parameter space of DM-electron and DM-nucleon scattering cross sections
for direct detection. For DM-electron scattering, a significant fraction of the
parameter space is already ruled out by beam-dump and supernova cooling
constraints.
| [
{
"created": "Tue, 1 Nov 2011 20:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2012 03:39:32 GMT",
"version": "v2"
}
] | 2012-12-12 | [
[
"Lin",
"Tongyan",
""
],
[
"Yu",
"Hai-Bo",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | We examine cosmological, astrophysical and collider constraints on thermal dark matter (DM) with mass mX in the range 1 MeV to 10 GeV. Cosmic microwave background (CMB) observations, which severely constrain light symmetric DM, can be evaded if the DM relic density is sufficiently asymmetric. CMB constraints require the present anti-DM to DM ratio to be less than 2*10^{-6} (10^{-1}) for DM mass mX = 1 MeV (10 GeV) with ionizing efficiency factor f ~ 1. We determine the minimum annihilation cross section for achieving these asymmetries subject to the relic density constraint; these cross sections are larger than the usual thermal annihilation cross section. On account of collider constraints, such annihilation cross sections can only be obtained by invoking light mediators. These light mediators can give rise to significant DM self-interactions, and we derive a lower bound on the mediator mass from elliptical DM halo shape constraints. We find that halo shapes require a mediator with mass mphi > 4 * 10^{-2} MeV (40 MeV) for mX = 1 MeV (10 GeV). We map all of these constraints to the parameter space of DM-electron and DM-nucleon scattering cross sections for direct detection. For DM-electron scattering, a significant fraction of the parameter space is already ruled out by beam-dump and supernova cooling constraints. |
1009.3215 | Javier L. Albacete | Javier L. Albacete and Cyrille Marquet | Single and double inclusive particle production in d+Au collisions at
RHIC, leading twist and beyond | 20 pages ann 9 figures. Contribution to the proceedings of the
Workshop "Saturation, the Color Glass Condensate and Glasma: What Have we
Learned from RHIC?", May 10-12 2010, Brookhaven National Laboratory, USA | Nucl.Phys.A854:154-167,2011 | 10.1016/j.nuclphysa.2010.09.014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the evidence for the presence of QCD saturation effects in the
data collected in d+Au collisions at RHIC. In particular we focus our analysis
on forward hadron yields and azimuthal correlations. Approaches alternative to
the CGC description of these two observables are discussed in parallel.
| [
{
"created": "Thu, 16 Sep 2010 16:21:44 GMT",
"version": "v1"
}
] | 2011-03-17 | [
[
"Albacete",
"Javier L.",
""
],
[
"Marquet",
"Cyrille",
""
]
] | We discuss the evidence for the presence of QCD saturation effects in the data collected in d+Au collisions at RHIC. In particular we focus our analysis on forward hadron yields and azimuthal correlations. Approaches alternative to the CGC description of these two observables are discussed in parallel. |
1509.07938 | Mauro Napsuciale | M. Napsuciale, S. Rodr\'iguez, Rodolfo Ferro-Hern\'andez, Selim
G\'omez-\'Avila | Spin one matter fields | 20 pages, discussion of constraints in the coupled case, the
classical massless limit and corresponding gauge invariance added in the new
version to appear in Phys Rev D | Phys. Rev. D 93, 076003 (2016) | 10.1103/PhysRevD.93.076003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin-one matter fields are relevant both for the description of hadronic
states and as potential extensions of the Standard Model. In this work we
present a formalism for the description of massive spin-one fields transforming
in the $(1,0)\oplus(0,1)$ representation of the Lorentz group, based on the
covariant projection onto parity eigenspaces and Poincar\'e orbits. The
formalism yields a constrained dynamics. We solve the constraints and perform
the canonical quantization accordingly. This formulation uses the recent
construction of a parity-based covariant basis for matrix operators acting on
the $(j,0)\oplus(0,j) $ representations. The algebraic properties of the
covariant basis play an important role in solving the constraints and allowing
the canonical quantization of the theory. We study the chiral structure of the
theory and conclude that it is not chirally symmetric in the massless limit,
hence it is not possible to have chiral gauge interactions. However, spin-one
matter fields can have vector gauge interactions. Also, the dimension of the
field makes self-interactions naively renormalizable. Using the covariant
basis, we classify all possible naively renormalizable self-interaction terms.
| [
{
"created": "Sat, 26 Sep 2015 02:50:57 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Mar 2016 14:48:42 GMT",
"version": "v2"
}
] | 2016-04-13 | [
[
"Napsuciale",
"M.",
""
],
[
"Rodríguez",
"S.",
""
],
[
"Ferro-Hernández",
"Rodolfo",
""
],
[
"Gómez-Ávila",
"Selim",
""
]
] | Spin-one matter fields are relevant both for the description of hadronic states and as potential extensions of the Standard Model. In this work we present a formalism for the description of massive spin-one fields transforming in the $(1,0)\oplus(0,1)$ representation of the Lorentz group, based on the covariant projection onto parity eigenspaces and Poincar\'e orbits. The formalism yields a constrained dynamics. We solve the constraints and perform the canonical quantization accordingly. This formulation uses the recent construction of a parity-based covariant basis for matrix operators acting on the $(j,0)\oplus(0,j) $ representations. The algebraic properties of the covariant basis play an important role in solving the constraints and allowing the canonical quantization of the theory. We study the chiral structure of the theory and conclude that it is not chirally symmetric in the massless limit, hence it is not possible to have chiral gauge interactions. However, spin-one matter fields can have vector gauge interactions. Also, the dimension of the field makes self-interactions naively renormalizable. Using the covariant basis, we classify all possible naively renormalizable self-interaction terms. |
1401.8162 | Azad Inshalla oglu Ahmadov | A. I. Ahmadov, C. Aydin, O. Uzun | Inclusive Gluon Production in Pion-Proton Collisions and the Principle
Maximum Conformality Renormalization Scale | 20 pages, 15 figures | Phys. ReV. D 89, 014018 (2014) | 10.1103/PhysRevD.89.014018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The contribution of the higher-twist mechanism to the large-$p_T$ inclusive
gluon production cross section in $\pi p$ collisions is calculated in case of
the principle of maximum conformality and Brodsky-Lepage-Mackenzie approaches
in the dependence of the pion distribution amplitudes. The higher-twist cross
sections obtained in the framework of the principle of maximum conformality and
Brodsky-Lepage-Mackenzie approaches, and compared and analyzed in relation to
the leading-twist cross sections and each other.
| [
{
"created": "Fri, 31 Jan 2014 13:37:22 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Ahmadov",
"A. I.",
""
],
[
"Aydin",
"C.",
""
],
[
"Uzun",
"O.",
""
]
] | The contribution of the higher-twist mechanism to the large-$p_T$ inclusive gluon production cross section in $\pi p$ collisions is calculated in case of the principle of maximum conformality and Brodsky-Lepage-Mackenzie approaches in the dependence of the pion distribution amplitudes. The higher-twist cross sections obtained in the framework of the principle of maximum conformality and Brodsky-Lepage-Mackenzie approaches, and compared and analyzed in relation to the leading-twist cross sections and each other. |
1905.09363 | Mehmet Demirci PhD | Mehmet Demirci | Associated production of Higgs boson with a photon at electron-positron
colliders | 16 pages (two columns), 24 figures, 4 tables | Phys. Rev. D 100, 075006 (2019) | 10.1103/PhysRevD.100.075006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A complete one-loop prediction for the single production of the neutral Higgs
bosons in association with a photon in electron-positron collisions is
presented in the framework the minimal supersymmetric standard model (MSSM),
paying special attention to the individual contribution from each type of
diagram. This process has no amplitude at tree level and is hence directly
sensitive to one-loop impacts and the underlying dynamics of Higgs. To
investigate the effect of the new physics, four different scenarios, which
include a Higgs boson with mass and couplings consistent with those of the
discovered Higgs boson and a considerable part of parameter space allowed by
the bounds from the searches for additional Higgs bosons and sparticles, are
chosen in the MSSM. The dependence of the cross section in both the standard
model(SM) and MSSM on the center-of-mass energy is examined by considering the
polarizations of the initial electron and positron beams. The effect of
individual contributions from each type of one-loop diagram on the total cross
section is also investigated in detail. Furthermore, the total cross sections
of $e^- e^+ \rightarrow \gamma h^0$ as well as $e^- e^+ \rightarrow \gamma A^0$
are scanned over the plane $m_A-\tan\beta$ for each scenario. The full one-loop
contributions are crucial for the analysis of beyond the SM physics at a future
electron-positron collider.
| [
{
"created": "Wed, 22 May 2019 20:58:51 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Oct 2019 15:01:42 GMT",
"version": "v2"
}
] | 2019-10-09 | [
[
"Demirci",
"Mehmet",
""
]
] | A complete one-loop prediction for the single production of the neutral Higgs bosons in association with a photon in electron-positron collisions is presented in the framework the minimal supersymmetric standard model (MSSM), paying special attention to the individual contribution from each type of diagram. This process has no amplitude at tree level and is hence directly sensitive to one-loop impacts and the underlying dynamics of Higgs. To investigate the effect of the new physics, four different scenarios, which include a Higgs boson with mass and couplings consistent with those of the discovered Higgs boson and a considerable part of parameter space allowed by the bounds from the searches for additional Higgs bosons and sparticles, are chosen in the MSSM. The dependence of the cross section in both the standard model(SM) and MSSM on the center-of-mass energy is examined by considering the polarizations of the initial electron and positron beams. The effect of individual contributions from each type of one-loop diagram on the total cross section is also investigated in detail. Furthermore, the total cross sections of $e^- e^+ \rightarrow \gamma h^0$ as well as $e^- e^+ \rightarrow \gamma A^0$ are scanned over the plane $m_A-\tan\beta$ for each scenario. The full one-loop contributions are crucial for the analysis of beyond the SM physics at a future electron-positron collider. |
2307.15731 | David Dunsky | Juanca Carrasco-Martinez, David I. Dunsky, Lawrence J. Hall, Keisuke
Harigaya | Leptogenesis in Parity Solutions to the Strong CP Problem and Standard
Model Parameters | 41 pages, 12 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the simplest theories with exact spacetime parity that solve the
strong CP problem and successfully generate the cosmological baryon asymmetry
via decays of right-handed neutrinos. Lower bounds are derived for the masses
of the right-handed neutrinos and for the scale of spontaneous parity breaking,
$v_R$. For generic thermal leptogenesis, $v_R \gtrsim 10^{12}$ GeV, unless the
small observed neutrino masses arise from fine-tuning. We compute $v_R$ in
terms of the top quark mass, the QCD coupling, and the Higgs boson mass and
find this bound is consistent with current data at $1 \sigma$. Future precision
measurements of these parameters may provide support for the theory or, if
$v_R$ is determined to be below $10^{12}$ GeV, force modifications. However,
modified cosmologies do not easily allow reductions in $v_R$ -- no reduction is
possible if leptogenesis occurs in the collisions of domain walls formed at
parity breaking, and at most a factor 10 reduction is possible with non-thermal
leptogenesis. Standard Model parameters that yield low values for $v_R$ can
only be accommodated by having a high degree of degeneracy among the
right-handed neutrinos involved in leptogenesis. If future precision
measurements determine $v_R$ to be above $10^{12}$ GeV, it is likely that
higher-dimensional operators of the theory will yield a neutron electric dipole
moment accessible to ongoing experiments. This is especially true in a simple
UV completion of the neutrino sector, involving gauge singlet fermions, where
the bound from successful leptogenesis is strengthened to $v_R \gtrsim 10^{13}$
GeV.
| [
{
"created": "Fri, 28 Jul 2023 18:00:00 GMT",
"version": "v1"
}
] | 2023-08-01 | [
[
"Carrasco-Martinez",
"Juanca",
""
],
[
"Dunsky",
"David I.",
""
],
[
"Hall",
"Lawrence J.",
""
],
[
"Harigaya",
"Keisuke",
""
]
] | We study the simplest theories with exact spacetime parity that solve the strong CP problem and successfully generate the cosmological baryon asymmetry via decays of right-handed neutrinos. Lower bounds are derived for the masses of the right-handed neutrinos and for the scale of spontaneous parity breaking, $v_R$. For generic thermal leptogenesis, $v_R \gtrsim 10^{12}$ GeV, unless the small observed neutrino masses arise from fine-tuning. We compute $v_R$ in terms of the top quark mass, the QCD coupling, and the Higgs boson mass and find this bound is consistent with current data at $1 \sigma$. Future precision measurements of these parameters may provide support for the theory or, if $v_R$ is determined to be below $10^{12}$ GeV, force modifications. However, modified cosmologies do not easily allow reductions in $v_R$ -- no reduction is possible if leptogenesis occurs in the collisions of domain walls formed at parity breaking, and at most a factor 10 reduction is possible with non-thermal leptogenesis. Standard Model parameters that yield low values for $v_R$ can only be accommodated by having a high degree of degeneracy among the right-handed neutrinos involved in leptogenesis. If future precision measurements determine $v_R$ to be above $10^{12}$ GeV, it is likely that higher-dimensional operators of the theory will yield a neutron electric dipole moment accessible to ongoing experiments. This is especially true in a simple UV completion of the neutrino sector, involving gauge singlet fermions, where the bound from successful leptogenesis is strengthened to $v_R \gtrsim 10^{13}$ GeV. |
hep-ph/0608060 | Eligio Lisi | G.L. Fogli, E. Lisi, A. Marrone, A. Melchiorri, A. Palazzo, P. Serra,
J. Silk, A. Slosar | Observables sensitive to absolute neutrino masses: A reappraisal after
WMAP-3y and first MINOS results | 18 pages, including 7 figures | Phys.Rev.D75:053001,2007 | 10.1103/PhysRevD.75.053001 | null | hep-ph astro-ph gr-qc | null | In the light of recent neutrino oscillation and non-oscillation data, we
revisit the phenomenological constraints applicable to three observables
sensitive to absolute neutrino masses: The effective neutrino mass in single
beta decay (m_beta); the effective Majorana neutrino mass in neutrinoless
double beta decay (m_2beta); and the sum of neutrino masses in cosmology
(Sigma). In particular, we include the constraints coming from the first Main
Injector Neutrino Oscillation Search (MINOS) data and from the Wilkinson
Microwave Anisotropy Probe (WMAP) three-year (3y) data, as well as other
relevant cosmological data and priors. We find that the largest neutrino
squared mass difference is determined with a 15% accuracy (at 2-sigma) after
adding MINOS to world data. We also find upper bounds on the sum of neutrino
masses Sigma ranging from ~2 eV (WMAP-3y data only) to ~0.2 eV (all
cosmological data) at 2-sigma, in agreement with previous studies. In addition,
we discuss the connection of such bounds with those placed on the matter power
spectrum normalization parameter sigma_8. We show how the partial degeneracy
between Sigma and sigma_8 in WMAP-3y data is broken by adding further
cosmological data, and how the overall preference of such data for relatively
high values of sigma_8 pushes the upper bound of Sigma in the sub-eV range.
Finally, for various combination of data sets, we revisit the (in)compatibility
between current Sigma and m_2beta constraints (and claims), and derive
quantitative predictions for future single and double beta decay experiments.
| [
{
"created": "Fri, 4 Aug 2006 14:49:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fogli",
"G. L.",
""
],
[
"Lisi",
"E.",
""
],
[
"Marrone",
"A.",
""
],
[
"Melchiorri",
"A.",
""
],
[
"Palazzo",
"A.",
""
],
[
"Serra",
"P.",
""
],
[
"Silk",
"J.",
""
],
[
"Slosar",
"A.",
""
]
] | In the light of recent neutrino oscillation and non-oscillation data, we revisit the phenomenological constraints applicable to three observables sensitive to absolute neutrino masses: The effective neutrino mass in single beta decay (m_beta); the effective Majorana neutrino mass in neutrinoless double beta decay (m_2beta); and the sum of neutrino masses in cosmology (Sigma). In particular, we include the constraints coming from the first Main Injector Neutrino Oscillation Search (MINOS) data and from the Wilkinson Microwave Anisotropy Probe (WMAP) three-year (3y) data, as well as other relevant cosmological data and priors. We find that the largest neutrino squared mass difference is determined with a 15% accuracy (at 2-sigma) after adding MINOS to world data. We also find upper bounds on the sum of neutrino masses Sigma ranging from ~2 eV (WMAP-3y data only) to ~0.2 eV (all cosmological data) at 2-sigma, in agreement with previous studies. In addition, we discuss the connection of such bounds with those placed on the matter power spectrum normalization parameter sigma_8. We show how the partial degeneracy between Sigma and sigma_8 in WMAP-3y data is broken by adding further cosmological data, and how the overall preference of such data for relatively high values of sigma_8 pushes the upper bound of Sigma in the sub-eV range. Finally, for various combination of data sets, we revisit the (in)compatibility between current Sigma and m_2beta constraints (and claims), and derive quantitative predictions for future single and double beta decay experiments. |
hep-ph/0603033 | Alessandro Mirizzi | G.L. Fogli, E. Lisi, A. Mirizzi (U. of Bari & INFN, Bari), D.
Montanino (U. of Lecce & INFN, Lecce) | Damping of supernova neutrino transitions in stochastic shock-wave
density profiles | v2 (23 pages, including 6 eps figures). Typos removed, references
updated, matches the published version | JCAP 0606:012,2006 | 10.1088/1475-7516/2006/06/012 | null | hep-ph astro-ph | null | Supernova neutrino flavor transitions during the shock wave propagation are
known to encode relevant information not only about the matter density profile
but also about unknown neutrino properties, such as the mass hierarchy (normal
or inverted) and the mixing angle theta_13. While previous studies have
focussed on "deterministic" density profiles, we investigate the effect of
possible stochastic matter density fluctuations in the wake of supernova shock
waves. In particular, we study the impact of small-scale fluctuations on the
electron (anti)neutrino survival probability, and on the observable spectra of
inverse-beta-decay events in future water-Cherenkov detectors. We find that
such fluctuations, even with relatively small amplitudes, can have significant
damping effects on the flavor transition pattern, and can partly erase the
shock-wave imprint on the observable time spectra, especially for
sin^2(theta_13) > O(10^-3).
| [
{
"created": "Fri, 3 Mar 2006 16:44:25 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 2006 14:52:36 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Fogli",
"G. L.",
"",
"U. of Bari & INFN, Bari"
],
[
"Lisi",
"E.",
"",
"U. of Bari & INFN, Bari"
],
[
"Mirizzi",
"A.",
"",
"U. of Bari & INFN, Bari"
],
[
"Montanino",
"D.",
"",
"U. of Lecce & INFN, Lecce"
]
] | Supernova neutrino flavor transitions during the shock wave propagation are known to encode relevant information not only about the matter density profile but also about unknown neutrino properties, such as the mass hierarchy (normal or inverted) and the mixing angle theta_13. While previous studies have focussed on "deterministic" density profiles, we investigate the effect of possible stochastic matter density fluctuations in the wake of supernova shock waves. In particular, we study the impact of small-scale fluctuations on the electron (anti)neutrino survival probability, and on the observable spectra of inverse-beta-decay events in future water-Cherenkov detectors. We find that such fluctuations, even with relatively small amplitudes, can have significant damping effects on the flavor transition pattern, and can partly erase the shock-wave imprint on the observable time spectra, especially for sin^2(theta_13) > O(10^-3). |
1208.0727 | Frank Deppisch | Frank F. Deppisch, Martin Hirsch and Heinrich P\"as | Neutrinoless Double Beta Decay and Physics Beyond the Standard Model | 31 pages, 10 figures, contribution to focus issue on Double Beta
Decay in J. Phys. G | null | 10.1088/0954-3899/39/12/124007 | IFIC/12-56 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrinoless double beta decay is the most powerful tool to probe not only
for Majorana neutrino masses but for lepton number violating physics in
general. We discuss relations between lepton number violation, double beta
decay and neutrino mass, review a general Lorentz invariant parametrization of
the double beta decay rate, highlight a number of different new physics models
showing how different mechanisms can trigger double beta decay, and finally
discuss possibilities to discriminate and test these models and mechanisms in
complementary experiments.
| [
{
"created": "Fri, 3 Aug 2012 12:42:16 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Deppisch",
"Frank F.",
""
],
[
"Hirsch",
"Martin",
""
],
[
"Päs",
"Heinrich",
""
]
] | Neutrinoless double beta decay is the most powerful tool to probe not only for Majorana neutrino masses but for lepton number violating physics in general. We discuss relations between lepton number violation, double beta decay and neutrino mass, review a general Lorentz invariant parametrization of the double beta decay rate, highlight a number of different new physics models showing how different mechanisms can trigger double beta decay, and finally discuss possibilities to discriminate and test these models and mechanisms in complementary experiments. |
1901.10320 | Bowen Xiao | Cheng Zhang, Cyrille Marquet, Guang-You Qin, Shu-Yi Wei and Bo-Wen
Xiao | On the elliptic flow of heavy quarkonia in $pA$ collisions | 6 pages, 3 figures;v2: a few minor typo corrected | Phys. Rev. Lett. 122, 172302 (2019) | 10.1103/PhysRevLett.122.172302 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the dilute-dense factorization in the Color Glass Condensate framework,
we investigate the azimuthal angular correlation between a heavy quarkonium and
a charged light hadron in proton-nucleus collisions. We extract the second
harmonic $v_2$, commonly known as the elliptic flow, with the light hadron as
the reference. This particular azimuthal angular correlation between a heavy
meson and a light hadron has first been measured at the LHC recently. The
experimental results indicate that the elliptic flows for heavy-flavor mesons
($J/\psi$ and $D^0$) are almost as large as those for light hadrons. Our
calculation demonstrates that this result can be naturally interpreted as an
initial state effect due to the interaction between the incoming partons from
the proton and the dense gluons inside the target nucleus. Since the heavy
quarkonium $v_2$ exhibits a weak mass dependence according to our calculation,
we predict that the heavy quarkonium $\Upsilon$ should have a similar elliptic
flow as compared to that of the $J/\psi$, which can be tested in future
measurements.
| [
{
"created": "Tue, 29 Jan 2019 14:50:08 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2019 12:22:56 GMT",
"version": "v2"
}
] | 2019-05-08 | [
[
"Zhang",
"Cheng",
""
],
[
"Marquet",
"Cyrille",
""
],
[
"Qin",
"Guang-You",
""
],
[
"Wei",
"Shu-Yi",
""
],
[
"Xiao",
"Bo-Wen",
""
]
] | Using the dilute-dense factorization in the Color Glass Condensate framework, we investigate the azimuthal angular correlation between a heavy quarkonium and a charged light hadron in proton-nucleus collisions. We extract the second harmonic $v_2$, commonly known as the elliptic flow, with the light hadron as the reference. This particular azimuthal angular correlation between a heavy meson and a light hadron has first been measured at the LHC recently. The experimental results indicate that the elliptic flows for heavy-flavor mesons ($J/\psi$ and $D^0$) are almost as large as those for light hadrons. Our calculation demonstrates that this result can be naturally interpreted as an initial state effect due to the interaction between the incoming partons from the proton and the dense gluons inside the target nucleus. Since the heavy quarkonium $v_2$ exhibits a weak mass dependence according to our calculation, we predict that the heavy quarkonium $\Upsilon$ should have a similar elliptic flow as compared to that of the $J/\psi$, which can be tested in future measurements. |
1806.06388 | Rui-Lin Zhu | Ruilin Zhu, Xin-Ling Han, Yan Ma, Zhen-Jun Xiao | Weak decays of $B_c$ into two hadrons under flavor SU(3) symmetry | 11 pages, 1 figure and 10 tables. To be published in EPJC | Eur. Phys. J. C (2018) 78:740 | 10.1140/epjc/s10052-018-6214-1 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A large number of $B_c$ meson events have been recorded at the LHCb detector,
especially some two-body hadronic decay modes. We analyzed the weak decays of
the $B_c$ meson into two hadron states under the flavor SU(3) symmetry. The
relations among amplitudes of $B_c$ into $ D+P(V)$, $B+P(V)$, $P(V)+P(V)$,
$T_8+\bar T_8$ and $T_{10}+\bar T_{10}$ were investigated systematically, where
$P$ ( $V$) denotes a light pseudoscalar (vector) meson and $T_{8,10}$ denotes a
light baryon. The $\eta-\eta'$ mixing and $\omega-\phi$ mixing effects are also
considered for the phenomenological discussions. We obtained the relations
among decay widths of different $B_c$ decay channels. These results are helpful
to study the two-body decay properties of the $B_c$ meson and test the flavor
SU(3) symmetry.
| [
{
"created": "Sun, 17 Jun 2018 14:22:12 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Sep 2018 01:57:32 GMT",
"version": "v2"
}
] | 2018-09-18 | [
[
"Zhu",
"Ruilin",
""
],
[
"Han",
"Xin-Ling",
""
],
[
"Ma",
"Yan",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] | A large number of $B_c$ meson events have been recorded at the LHCb detector, especially some two-body hadronic decay modes. We analyzed the weak decays of the $B_c$ meson into two hadron states under the flavor SU(3) symmetry. The relations among amplitudes of $B_c$ into $ D+P(V)$, $B+P(V)$, $P(V)+P(V)$, $T_8+\bar T_8$ and $T_{10}+\bar T_{10}$ were investigated systematically, where $P$ ( $V$) denotes a light pseudoscalar (vector) meson and $T_{8,10}$ denotes a light baryon. The $\eta-\eta'$ mixing and $\omega-\phi$ mixing effects are also considered for the phenomenological discussions. We obtained the relations among decay widths of different $B_c$ decay channels. These results are helpful to study the two-body decay properties of the $B_c$ meson and test the flavor SU(3) symmetry. |
0910.3624 | Manuel Toharia | Manuel Toharia | Flavor Bounds and Phenomenology in the Scalar Sector of RS Scenarios | 6 pages, 4 figures, To appear in the proceedings of SUSY09, the 17th
International Conference on Supersymmetry and the Unification of Fundamental
Interactions. Added references and correctly edited figure 3. | AIP Conf.Proc.1200:627-630,2010 | 10.1063/1.3327689 | UMD-PP-09-054 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of a warped extra-dimension with Standard Model fields in the
bulk, we obtain the general flavor structure of the couplings to fermions of
both the Higgs scalar and the radion graviscalar. In the Flavor Anarchy
paradigm, these couplings are generically misaligned with respect to the
fermion mass matrix and moreover the off-diagonal couplings can be estimated
parametrically as a function of fermion masses and the observed mixing angles.
One can then study the flavor constraints and predictions arising from these
couplings.
| [
{
"created": "Mon, 19 Oct 2009 17:45:20 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 2010 16:48:45 GMT",
"version": "v2"
}
] | 2010-05-25 | [
[
"Toharia",
"Manuel",
""
]
] | In the context of a warped extra-dimension with Standard Model fields in the bulk, we obtain the general flavor structure of the couplings to fermions of both the Higgs scalar and the radion graviscalar. In the Flavor Anarchy paradigm, these couplings are generically misaligned with respect to the fermion mass matrix and moreover the off-diagonal couplings can be estimated parametrically as a function of fermion masses and the observed mixing angles. One can then study the flavor constraints and predictions arising from these couplings. |
hep-ph/0101216 | null | A. Ni\'egawa | Fermion propagator in out of equilibrium quantum-field system and the
Boltzmann equation | 27 pages | Phys.Rev. D65 (2002) 056009 | 10.1103/PhysRevD.65.056009 | OCU-PHYS-179 (Revised), October 2001 | hep-ph hep-th | null | We aim to construct from first principles a perturbative framework for
studying nonequilibrium quantum-field systems that include massless Dirac
fermions. The system of our concern is quasiuniform system near equilibrium or
nonequilibrium quasistationary system. We employ the closed-time-path formalism
and use the so-called gradient approximation. Essentially no further
approximation is introduced. We construct a fermion propagator, with which a
well-defined perturbative framework is formulated. In the course of
construction of the framework, we obtain the generalized Boltzmann equation
(GBE) that describes the evolution of the number-density functions of
(anti)fermionic quasiparticles.
| [
{
"created": "Fri, 19 Jan 2001 09:16:39 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Nov 2001 09:25:48 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Niégawa",
"A.",
""
]
] | We aim to construct from first principles a perturbative framework for studying nonequilibrium quantum-field systems that include massless Dirac fermions. The system of our concern is quasiuniform system near equilibrium or nonequilibrium quasistationary system. We employ the closed-time-path formalism and use the so-called gradient approximation. Essentially no further approximation is introduced. We construct a fermion propagator, with which a well-defined perturbative framework is formulated. In the course of construction of the framework, we obtain the generalized Boltzmann equation (GBE) that describes the evolution of the number-density functions of (anti)fermionic quasiparticles. |
0705.4542 | Alan Cornell | T. M. Aliev, A. S. Cornell and Naveen Gaur | B \to K(K^*) missing energy in Unparticle physics | 13 pages, 5 figures | JHEP 0707:072,2007 | 10.1088/1126-6708/2007/07/072 | null | hep-ph | null | In the present work we study the effects of an unparticle $\unpart$ as the
possible source of missing energy in the decay $B \to K (K^*) + {\rm missing
energy}$. We find that the dependence of the differential branching ratio on
the $K$($K^*$)-meson's energy in the presence of the vector unparticle
operators is very distinctive from that of the SM. Moreover, in using the
existing upper bound on $B \to K (K^*) + {\rm missing energy}$ decays, we have
been able to put more stringent constraints on the parameters of unparticle
stuff.
| [
{
"created": "Thu, 31 May 2007 08:49:43 GMT",
"version": "v1"
}
] | 2009-04-21 | [
[
"Aliev",
"T. M.",
""
],
[
"Cornell",
"A. S.",
""
],
[
"Gaur",
"Naveen",
""
]
] | In the present work we study the effects of an unparticle $\unpart$ as the possible source of missing energy in the decay $B \to K (K^*) + {\rm missing energy}$. We find that the dependence of the differential branching ratio on the $K$($K^*$)-meson's energy in the presence of the vector unparticle operators is very distinctive from that of the SM. Moreover, in using the existing upper bound on $B \to K (K^*) + {\rm missing energy}$ decays, we have been able to put more stringent constraints on the parameters of unparticle stuff. |
hep-ph/0403085 | Jurgen Reuter | Heike Boos, Thomas Mannel, and Jurgen Reuter | The Gold-plated mode revisited: sin(2 beta) and B^0 to J/Psi K_S in the
Standard Model | 15 pages, 4 postscript figures | Phys.Rev. D70 (2004) 036006 | 10.1103/PhysRevD.70.036006 | SI-HEP-2004-04, TTP03-23 | hep-ph | null | We study the corrections to the determination of sin(2 beta) from the time
dependent CP asymmetry of B^0 to J/Psi K_S which arise in the standard model.
Although a precise prediction of these corrections is not possible we find that
they are indeed extremely small, of the order of less than a per mil of the
observed value. This means in turn that any deviation visible at the B
factories will be a clear signal for new physics.
| [
{
"created": "Mon, 8 Mar 2004 16:53:18 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Boos",
"Heike",
""
],
[
"Mannel",
"Thomas",
""
],
[
"Reuter",
"Jurgen",
""
]
] | We study the corrections to the determination of sin(2 beta) from the time dependent CP asymmetry of B^0 to J/Psi K_S which arise in the standard model. Although a precise prediction of these corrections is not possible we find that they are indeed extremely small, of the order of less than a per mil of the observed value. This means in turn that any deviation visible at the B factories will be a clear signal for new physics. |
2205.01516 | Robin Sch\"urmann | X. Chen, T. Gehrmann, E.W.N. Glover, M. H\"ofer, A. Huss, R.
Sch\"urmann | Single Photon Production at Hadron Colliders at NNLO QCD with Realistic
Photon Isolation | 42 pages, 19 figures, one table, journal version, four ancillary data
files with the NNLO predictions enclosed | null | 10.1007/JHEP08(2022)094 | ZU-TH 16/22, KA-TP-12-2022, P3H-22-044, IPPP/22/30,
CERN-TH-2022-072, LMU-ASC 17/22 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Isolated photons at hadron colliders are defined by permitting only a limited
amount of hadronic energy inside a fixed-size cone around the candidate photon
direction. This isolation criterion admits contributions from collinear photon
radiation off QCD partons and from parton-to-photon fragmentation processes. We
compute the NNLO QCD corrections to isolated photon and photon-plus-jet
production, including these two contributions. Our newly derived results allow
us to reproduce the isolation prescription used in the experimental
measurements, performing detailed comparisons with data from the LHC
experiments. We quantify the impact of different photon isolation
prescriptions, including no isolation at all, on photon-plus-jet cross sections
and discuss possible measurements of the photon fragmentation functions at
hadron colliders.
| [
{
"created": "Tue, 3 May 2022 14:11:22 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2022 15:40:45 GMT",
"version": "v2"
}
] | 2022-08-12 | [
[
"Chen",
"X.",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Höfer",
"M.",
""
],
[
"Huss",
"A.",
""
],
[
"Schürmann",
"R.",
""
]
] | Isolated photons at hadron colliders are defined by permitting only a limited amount of hadronic energy inside a fixed-size cone around the candidate photon direction. This isolation criterion admits contributions from collinear photon radiation off QCD partons and from parton-to-photon fragmentation processes. We compute the NNLO QCD corrections to isolated photon and photon-plus-jet production, including these two contributions. Our newly derived results allow us to reproduce the isolation prescription used in the experimental measurements, performing detailed comparisons with data from the LHC experiments. We quantify the impact of different photon isolation prescriptions, including no isolation at all, on photon-plus-jet cross sections and discuss possible measurements of the photon fragmentation functions at hadron colliders. |
hep-ph/0111143 | N. Nikolaev | N.N. Nikolaev (Institut f. Kernphysik, Forschungszentrum Juelich,
Germany and L.D. Landau Institute for Theoretical Physics, Chernogolovka,
Russia) | Diffractive DIS: Where Are We? | Invited talk at the International Conference on New Trends in High
Eenergy Physics, (experiment, phenomenology, theory), Yalta, Crimea, Ukraine,
22-29 September, 2001, 16 pages, 6 figures, typos in references corrected | null | null | null | hep-ph hep-ex | null | A brief review of the modern QCD theory of diffractive DIS is given. The
recent progress has been remarkably rapid, all the principal predictions from
the color dipole approach to diffraction - the $(Q^2+m_V^2)$ scaling, the
pattern of SCHNC, shrinkage of the diffraction cone in hard diffractive DIS,
the strong impact of longitudinal gluons in inclusive $J/\Psi$ production at
Tevatron -, have been confirmed experimentally.
| [
{
"created": "Mon, 12 Nov 2001 15:19:50 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Nov 2001 10:28:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Nikolaev",
"N. N.",
"",
"Institut f. Kernphysik, Forschungszentrum Juelich,\n Germany and L.D. Landau Institute for Theoretical Physics, Chernogolovka,\n Russia"
]
] | A brief review of the modern QCD theory of diffractive DIS is given. The recent progress has been remarkably rapid, all the principal predictions from the color dipole approach to diffraction - the $(Q^2+m_V^2)$ scaling, the pattern of SCHNC, shrinkage of the diffraction cone in hard diffractive DIS, the strong impact of longitudinal gluons in inclusive $J/\Psi$ production at Tevatron -, have been confirmed experimentally. |
1208.3039 | Sabine Kraml | Howard Baer, Sabine Kraml, and Suchita Kulkarni | Yukawa-unified natural supersymmetry | 18 pages, 7 figures, pdflatex; 3 references added | null | 10.1007/JHEP12(2012)066 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previous work on t-b-\tau Yukawa-unified supersymmetry, as expected from SUSY
GUT theories based on the gauge group SO(10), tended to have exceedingly large
electroweak fine-tuning (EWFT). Here, we examine supersymmetric models where we
simultaneously require low EWFT ("natural SUSY") and a high degree of Yukawa
coupling unification, along with a light Higgs scalar with m_h\sim125 GeV. As
Yukawa unification requires large tan\beta\sim50, while EWFT requires rather
light third generation squarks and low \mu\sim100-250 GeV, B-physics
constraints from BR(B\to X_s\gamma) and BR(B_s\to \mu+\mu-) can be severe. We
are able to find models with EWFT \Delta\lesssim 50-100 (better than 1-2% EWFT)
and with Yukawa unification as low as R_yuk\sim1.3 (30% unification) if
B-physics constraints are imposed. This may be improved to R_yuk\sim1.2 if
additional small flavor violating terms conspire to improve accord with
B-constraints. We present several Yukawa-unified natural SUSY (YUNS) benchmark
points. LHC searches will be able to access gluinos in the lower 1-2 TeV
portion of their predicted mass range although much of YUNS parameter space may
lie beyond LHC14 reach. If heavy Higgs bosons can be accessed at a high rate,
then the rare H, A\to \mu+\mu- decay might allow a determination of
tan\beta\sim50 as predicted by YUNS models. Finally, the predicted light
higgsinos should be accessible to a linear e+e- collider with \sqrt{s}\sim0.5
TeV.
| [
{
"created": "Wed, 15 Aug 2012 06:23:18 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Aug 2012 06:19:18 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Baer",
"Howard",
""
],
[
"Kraml",
"Sabine",
""
],
[
"Kulkarni",
"Suchita",
""
]
] | Previous work on t-b-\tau Yukawa-unified supersymmetry, as expected from SUSY GUT theories based on the gauge group SO(10), tended to have exceedingly large electroweak fine-tuning (EWFT). Here, we examine supersymmetric models where we simultaneously require low EWFT ("natural SUSY") and a high degree of Yukawa coupling unification, along with a light Higgs scalar with m_h\sim125 GeV. As Yukawa unification requires large tan\beta\sim50, while EWFT requires rather light third generation squarks and low \mu\sim100-250 GeV, B-physics constraints from BR(B\to X_s\gamma) and BR(B_s\to \mu+\mu-) can be severe. We are able to find models with EWFT \Delta\lesssim 50-100 (better than 1-2% EWFT) and with Yukawa unification as low as R_yuk\sim1.3 (30% unification) if B-physics constraints are imposed. This may be improved to R_yuk\sim1.2 if additional small flavor violating terms conspire to improve accord with B-constraints. We present several Yukawa-unified natural SUSY (YUNS) benchmark points. LHC searches will be able to access gluinos in the lower 1-2 TeV portion of their predicted mass range although much of YUNS parameter space may lie beyond LHC14 reach. If heavy Higgs bosons can be accessed at a high rate, then the rare H, A\to \mu+\mu- decay might allow a determination of tan\beta\sim50 as predicted by YUNS models. Finally, the predicted light higgsinos should be accessible to a linear e+e- collider with \sqrt{s}\sim0.5 TeV. |
hep-ph/0405272 | Stephen King | Stefan Antusch, S.F.King | Sequential Dominance | 24 pages, 2 figures, submitted to the Focus Issue on Neutrino Physics
edited by F.Halzen, M.Lindner and A.Suzuki, to be published in New Journal of
Physics | New J.Phys.6:110,2004 | 10.1088/1367-2630/6/1/110 | null | hep-ph | null | We review the mechanism of sequential right-handed neutrino dominance
proposed in the framework of the type I see-saw mechanism to account for
bi-large neutrino mixing and a neutrino mass hierarchy in a natural way. We
discuss how sequential dominance may also be applied to the right-handed
charged leptons, which alternatively allows bi-large lepton mixing from the
charged lepton sector. We review how such sequential dominance models may be
upgraded to include type II see-saw contributions, resulting in a partially
degenerate neutrino mass spectrum with bi-large lepton mixing arising from
sequential dominance. We also summarise the model building applications and the
phenomenological implications of sequential dominance.
| [
{
"created": "Thu, 27 May 2004 08:23:29 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jul 2004 15:34:58 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Antusch",
"Stefan",
""
],
[
"King",
"S. F.",
""
]
] | We review the mechanism of sequential right-handed neutrino dominance proposed in the framework of the type I see-saw mechanism to account for bi-large neutrino mixing and a neutrino mass hierarchy in a natural way. We discuss how sequential dominance may also be applied to the right-handed charged leptons, which alternatively allows bi-large lepton mixing from the charged lepton sector. We review how such sequential dominance models may be upgraded to include type II see-saw contributions, resulting in a partially degenerate neutrino mass spectrum with bi-large lepton mixing arising from sequential dominance. We also summarise the model building applications and the phenomenological implications of sequential dominance. |
2312.14766 | Vitaly Yermolchyk | A.B. Arbuzov, S.G. Bondarenko, I.R. Boyko, L.V. Kalinovskaya, A.A.
Kampf, R.R. Sadykov, V.L. Yermolchyk | SANC Monte Carlo programs for small-angle Bhabha scattering | Submitted to Chinese Physics C | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Luminosity monitoring at $e^+e^-$ colliders is investigated using SANC Monte
Carlo event generator ReneSANCe and integrator MCSANC for simulation of Bhabha
scattering at low angles. Results are presented for center-of-mass energies of
the Z boson resonance and 240 GeV for the conditions of typical luminosity
detectors. It is shown that taking into account bremsstrahlung events with
extremely low electron scattering angles is relevant to match the precision
tags of the future electron-positron colliders.
| [
{
"created": "Fri, 22 Dec 2023 15:32:14 GMT",
"version": "v1"
}
] | 2023-12-25 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Bondarenko",
"S. G.",
""
],
[
"Boyko",
"I. R.",
""
],
[
"Kalinovskaya",
"L. V.",
""
],
[
"Kampf",
"A. A.",
""
],
[
"Sadykov",
"R. R.",
""
],
[
"Yermolchyk",
"V. L.",
""
]
] | Luminosity monitoring at $e^+e^-$ colliders is investigated using SANC Monte Carlo event generator ReneSANCe and integrator MCSANC for simulation of Bhabha scattering at low angles. Results are presented for center-of-mass energies of the Z boson resonance and 240 GeV for the conditions of typical luminosity detectors. It is shown that taking into account bremsstrahlung events with extremely low electron scattering angles is relevant to match the precision tags of the future electron-positron colliders. |
2004.01470 | Miguel Escudero | Miguel Escudero, Samuel J. Witte | Could the Hubble Tension be Pointing Towards the Neutrino Mass
Mechanism? | 4 pages, 1 figure. Contribution to the NuPhys2019 proceedings:
https://indico.cern.ch/event/818781/ . Poster can be found at
https://www.dropbox.com/s/n6jizypa0wfcfto/Escudero_Poster_Nuphys2019.pdf?dl=0 | null | null | KCL-2020-12 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Local measurements of the Hubble constant currently disagree with the
high-precision value that is inferred from the CMB under the assumption of a
$\Lambda$CDM cosmology. The significance of this tension clearly motivates
studying extensions of the standard cosmological model capable of addressing
this outstanding issue. Broadly speaking, models that have been successful in
reducing the the tension between the CMB and local measurements (without
introducing additional tension in other datasets) require an additional
component of the energy density in the Universe at a time close to
recombination.
In this contribution, I will show that the Majoron -- a pseudo-Goldstone
boson arising from the spontaneous breaking of a global lepton number symmetry
and often associated with the neutrino mass mechanism -- can help to reduce the
Hubble tension. Importantly, I will also show that current CMB observations can
constrain neutrino-Majoron couplings as small as $10^{-13}$, which within the
type-I seesaw mechanism correspond to scales of lepton number breaking as high
as $\sim 1\,\text{TeV}$.
| [
{
"created": "Fri, 3 Apr 2020 11:11:19 GMT",
"version": "v1"
}
] | 2020-04-06 | [
[
"Escudero",
"Miguel",
""
],
[
"Witte",
"Samuel J.",
""
]
] | Local measurements of the Hubble constant currently disagree with the high-precision value that is inferred from the CMB under the assumption of a $\Lambda$CDM cosmology. The significance of this tension clearly motivates studying extensions of the standard cosmological model capable of addressing this outstanding issue. Broadly speaking, models that have been successful in reducing the the tension between the CMB and local measurements (without introducing additional tension in other datasets) require an additional component of the energy density in the Universe at a time close to recombination. In this contribution, I will show that the Majoron -- a pseudo-Goldstone boson arising from the spontaneous breaking of a global lepton number symmetry and often associated with the neutrino mass mechanism -- can help to reduce the Hubble tension. Importantly, I will also show that current CMB observations can constrain neutrino-Majoron couplings as small as $10^{-13}$, which within the type-I seesaw mechanism correspond to scales of lepton number breaking as high as $\sim 1\,\text{TeV}$. |
1810.01652 | Bo-Qiang Ma | Yanqi Huang, Bo-Qiang Ma | Lorentz violation from gamma-ray burst neutrinos | 7 latex pages, 5 figures, a slightly revised version | Communications Physics 1 (2018) 62 | 10.1038/s42005-018-0061-0 | null | hep-ph astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Lorentz violation~(LV) effect of ultra-relativistic particles can be
tested by gamma-ray burst~(GRB) neutrinos and photons. The IceCube
Collaboration has observed plenty of ultra-high energy neutrinos, including
four events of PeV scale neutrinos. Recent studies suggested a possible energy
dependent speed variation of GRB neutrinos in a similar way to that of GRB
photons. Here we find that all four events of PeV neutrinos with associated GRB
candidates can satisfy a regularity found from TeV neutrinos about a linear
form correlation between the observed time difference and the LV factor. Such
regularity indicates a Lorentz violation scale $E_{\rm LV}=(6.5\pm
0.4)\times10^{17}~{\rm GeV}$, which is comparable with that determined by GRB
photons. We also suggest that neutrinos and anti-neutrinos can be superluminal
and subluminal respectively due to opposite signs of LV correction.
| [
{
"created": "Wed, 3 Oct 2018 09:25:51 GMT",
"version": "v1"
}
] | 2018-10-04 | [
[
"Huang",
"Yanqi",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | The Lorentz violation~(LV) effect of ultra-relativistic particles can be tested by gamma-ray burst~(GRB) neutrinos and photons. The IceCube Collaboration has observed plenty of ultra-high energy neutrinos, including four events of PeV scale neutrinos. Recent studies suggested a possible energy dependent speed variation of GRB neutrinos in a similar way to that of GRB photons. Here we find that all four events of PeV neutrinos with associated GRB candidates can satisfy a regularity found from TeV neutrinos about a linear form correlation between the observed time difference and the LV factor. Such regularity indicates a Lorentz violation scale $E_{\rm LV}=(6.5\pm 0.4)\times10^{17}~{\rm GeV}$, which is comparable with that determined by GRB photons. We also suggest that neutrinos and anti-neutrinos can be superluminal and subluminal respectively due to opposite signs of LV correction. |
hep-ph/0407054 | Petter Callin | Petter Callin | Corrections to the Newtonian potential in the two-brane Randall-Sundrum
model | 6 pages, LaTeX2e with RevTeX4, 1 postscript figure; Contribution from
radion added, main conclusions unchanged. References updated | null | null | null | hep-ph gr-qc | null | We calculate the Newtonian potential in the two-brane Randall-Sundrum model,
emphasizing the effect of the finite distance between the two branes. The
result obtained is quite natural: When the distance in the potential is small
compared to the brane separation the two-brane model is indistinguishable from
the one-brane model, whereas when the distance is large the bulk dimension
behaves like an ordinary compact dimension, with an exponentially decreasing
correction to the four-dimensional potential. The contribution from the radion
is also included, and is found to give only a multiplicative factor of order 1
in the correction.
| [
{
"created": "Mon, 5 Jul 2004 12:55:02 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Dec 2004 11:21:51 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Callin",
"Petter",
""
]
] | We calculate the Newtonian potential in the two-brane Randall-Sundrum model, emphasizing the effect of the finite distance between the two branes. The result obtained is quite natural: When the distance in the potential is small compared to the brane separation the two-brane model is indistinguishable from the one-brane model, whereas when the distance is large the bulk dimension behaves like an ordinary compact dimension, with an exponentially decreasing correction to the four-dimensional potential. The contribution from the radion is also included, and is found to give only a multiplicative factor of order 1 in the correction. |
1708.00879 | Peter Petreczky | P. Huovinen and P. Petreczky | Hadron Resonance Gas with Repulsive Interactions and Fluctuations of
Conserved Charges | 12pages, 2 figures, ReVTeX, published version, unexpanded mean field
results added | null | 10.1016/j.physletb.2017.12.001 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the role of repulsive baryon-baryon interactions in a hadron gas
using relativistic virial expansion and repulsive mean field approaches. The
fluctuations of the baryon number as well as strangeness-baryon correlations
are calculated in the hadron resonance gas with repulsive interactions and
compared with the recent lattice QCD results. In particular, we calculate the
difference between the second and fourth order fluctuations and correlations of
baryon number and strangeness, that have been proposed as probes of
deconfinement. We show that for not too high temperatures these differences
could be understood in terms of repulsive interactions.
| [
{
"created": "Wed, 2 Aug 2017 18:21:05 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Mar 2018 16:14:08 GMT",
"version": "v2"
}
] | 2018-03-26 | [
[
"Huovinen",
"P.",
""
],
[
"Petreczky",
"P.",
""
]
] | We discuss the role of repulsive baryon-baryon interactions in a hadron gas using relativistic virial expansion and repulsive mean field approaches. The fluctuations of the baryon number as well as strangeness-baryon correlations are calculated in the hadron resonance gas with repulsive interactions and compared with the recent lattice QCD results. In particular, we calculate the difference between the second and fourth order fluctuations and correlations of baryon number and strangeness, that have been proposed as probes of deconfinement. We show that for not too high temperatures these differences could be understood in terms of repulsive interactions. |
hep-ph/9501394 | M. Lanzagorta Saldana | Marco Lanzagorta and Graham G. Ross | Infra-red fixed points revisited | 13 pages, LaTeX, 1 figure | Phys.Lett.B349:319-328,1995 | 10.1016/0370-2693(95)00099-7 | CERN-TH.7522/94, OUTP 9437P | hep-ph | null | We reconsider how Yukawa couplings may be determined in terms of a gauge
coupling through the infra-red fixed point structure paying particular regard
to the rate of approach to the fixed point. Using this we determine whether the
fixed point structure of an underlying unified theory may play a significant
role in fixing the couplings at the gauge unification scale. We argue that,
particularly in the case of compactified theories, this is likely to be the
case and illustrate this by a consideration of phenomenologically interesting
theories. We discuss in particular what the infra-red fixed point structure
implies for the top quark mass.
| [
{
"created": "Fri, 27 Jan 1995 14:36:51 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Lanzagorta",
"Marco",
""
],
[
"Ross",
"Graham G.",
""
]
] | We reconsider how Yukawa couplings may be determined in terms of a gauge coupling through the infra-red fixed point structure paying particular regard to the rate of approach to the fixed point. Using this we determine whether the fixed point structure of an underlying unified theory may play a significant role in fixing the couplings at the gauge unification scale. We argue that, particularly in the case of compactified theories, this is likely to be the case and illustrate this by a consideration of phenomenologically interesting theories. We discuss in particular what the infra-red fixed point structure implies for the top quark mass. |
1403.3110 | Samuel Wallon | S.Wallon | Exclusive Processes: Theory Introduction | 13 pages, 10 figures, proceedings of Photon 2013, May 20 - 24 2013,
Paris, France | null | null | LPT-14-4 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the recent developments on the theoretical description of exclusive
processes at medium and asymptotical energies. These are illustrated based on a
few examples.
| [
{
"created": "Wed, 12 Mar 2014 20:33:42 GMT",
"version": "v1"
}
] | 2014-03-14 | [
[
"Wallon",
"S.",
""
]
] | We review the recent developments on the theoretical description of exclusive processes at medium and asymptotical energies. These are illustrated based on a few examples. |
hep-ph/0412215 | Thomas Schaefer | Thomas Schaefer (North Carolina State University) | Instantons and the large N_c limit, A.D. 2004 | 18 pages, to appear in the proceedings of the workshop on ``Large N
QCD'', ECT* Trento (Italy), 2004; v2 references added | null | 10.1142/9789812701725_0003 | null | hep-ph | null | We review our current understanding of instanton effects in the large N_c
limit of QCD. We argue that the instanton liquid can have a smooth large N_c
limit which is in agreement with scaling relations derived from Feynman
diagrams. We also discuss certain limits of QCD, like the case of high baryon
density, in which the Witten-Veneziano relation can be derived from QCD and is
saturated by instantons.
| [
{
"created": "Wed, 15 Dec 2004 15:06:09 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2005 17:55:34 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Schaefer",
"Thomas",
"",
"North Carolina State University"
]
] | We review our current understanding of instanton effects in the large N_c limit of QCD. We argue that the instanton liquid can have a smooth large N_c limit which is in agreement with scaling relations derived from Feynman diagrams. We also discuss certain limits of QCD, like the case of high baryon density, in which the Witten-Veneziano relation can be derived from QCD and is saturated by instantons. |
2201.06831 | Neng-Chang Wei | Neng-Chang Wei, Ai-Chao Wang, and Fei Huang | Photoproduction $\gamma p \to K^+\Lambda(1690)$ in an effective
Lagrangian approach | To be published in Chinese Physics C | Chin. Phys. C 46, 053105 (2022) | 10.1088/1674-1137/ac4e7c | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | A gauge-invariant model is constructed for the $\gamma p \to
K^+\Lambda(1690)$ reaction within a tree-level effective Lagrangian approach
with the purpose to understand the underlying production mechanisms and to
study the resonance contributions in this reaction. In addition to the
$t$-channel $K$ and $K^\ast$ exchanges, the $s$-channel nucleon exchange, and
the interaction current, the $s$-channel nucleon resonance exchanges are also
included in constructing the reaction amplitudes to describe the data. It is
found that the contributions from the $s$-channel $N(2570)5/2^-$ exchange are
required to describe the most recently measured total cross-section data for
$\gamma p \to K^+\Lambda(1690)$ from the CLAS Collaboration. Further analysis
shows that the interaction current dominates the $\gamma p \to
K^+\Lambda(1690)$ reaction near the threshold as a result of gauge invariance.
The $t$-channel $K$ exchange contributes significantly, while the contributions
from the $t$-channel $K^\ast$ exchange as well as the $s$-channel nucleon
exchange turn out to be negligible. The contributions from the $s$-channel
$N(2570)5/2^-$ exchange are found to be responsible for the bump structure
shown in the CLAS total cross-section data above the center-of-mass energy $W
\approx 2.7$ GeV. The predictions of the differential cross sections for
$\gamma p \to K^+\Lambda(1690)$ are shown and discussed, which can provide
theoretical guidances for the future experiments.
| [
{
"created": "Tue, 18 Jan 2022 09:02:59 GMT",
"version": "v1"
}
] | 2022-04-08 | [
[
"Wei",
"Neng-Chang",
""
],
[
"Wang",
"Ai-Chao",
""
],
[
"Huang",
"Fei",
""
]
] | A gauge-invariant model is constructed for the $\gamma p \to K^+\Lambda(1690)$ reaction within a tree-level effective Lagrangian approach with the purpose to understand the underlying production mechanisms and to study the resonance contributions in this reaction. In addition to the $t$-channel $K$ and $K^\ast$ exchanges, the $s$-channel nucleon exchange, and the interaction current, the $s$-channel nucleon resonance exchanges are also included in constructing the reaction amplitudes to describe the data. It is found that the contributions from the $s$-channel $N(2570)5/2^-$ exchange are required to describe the most recently measured total cross-section data for $\gamma p \to K^+\Lambda(1690)$ from the CLAS Collaboration. Further analysis shows that the interaction current dominates the $\gamma p \to K^+\Lambda(1690)$ reaction near the threshold as a result of gauge invariance. The $t$-channel $K$ exchange contributes significantly, while the contributions from the $t$-channel $K^\ast$ exchange as well as the $s$-channel nucleon exchange turn out to be negligible. The contributions from the $s$-channel $N(2570)5/2^-$ exchange are found to be responsible for the bump structure shown in the CLAS total cross-section data above the center-of-mass energy $W \approx 2.7$ GeV. The predictions of the differential cross sections for $\gamma p \to K^+\Lambda(1690)$ are shown and discussed, which can provide theoretical guidances for the future experiments. |
hep-ph/0703083 | Georg Wolschin | Rolf Kuiper and Georg Wolschin | Hadron production in heavy relativistic systems | 8 pages, 3 figures | Europhys.Lett.78:22001,2007 | 10.1209/0295-5075/78/22001 | null | hep-ph | null | We investigate particle production in heavy-ion collisions at RHIC energies
as function of incident energy, and centrality in a three-sources Relativistic
Diffusion Model. Pseudorapidity distributions of produced charged hadrons in Au
+ Au and Cu + Cu collisions at sqrt(s_NN) = 19.6 GeV, 62.4 GeV, 130 GeV and 200
GeV show an almost equilibrated midrapidity source that tends to increase in
size towards higher incident energy, and more central collisions. It may
indicate quark-gluon plasma formation prior to hadronization.
| [
{
"created": "Wed, 7 Mar 2007 18:28:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kuiper",
"Rolf",
""
],
[
"Wolschin",
"Georg",
""
]
] | We investigate particle production in heavy-ion collisions at RHIC energies as function of incident energy, and centrality in a three-sources Relativistic Diffusion Model. Pseudorapidity distributions of produced charged hadrons in Au + Au and Cu + Cu collisions at sqrt(s_NN) = 19.6 GeV, 62.4 GeV, 130 GeV and 200 GeV show an almost equilibrated midrapidity source that tends to increase in size towards higher incident energy, and more central collisions. It may indicate quark-gluon plasma formation prior to hadronization. |
hep-ph/0101185 | Durmus Demir | D. A. Demir and Ernest Ma | Realistic Gluino Axion Model Consistent with Supersymmetry Breaking at
the TeV Scale | 12 pp, 2 figs | J.Phys. G27 (2001) L87-L94 | 10.1088/0954-3899/27/9/101 | UCRHEP-T297, TPI-MINN-01/01, UMN-TH-1933 | hep-ph | null | The recently proposed model of using the dynamical phase of the gluino to
solve the strong CP problem is shown to admit a specific realization in terms
of fundamental singlet superfields, such that the breaking of supersymmetry
occurs only at the TeV scale, despite the large axion scale of 10^{9} to
10^{12} GeV. Phenomenological implications are discussed.
| [
{
"created": "Tue, 16 Jan 2001 22:41:31 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Demir",
"D. A.",
""
],
[
"Ma",
"Ernest",
""
]
] | The recently proposed model of using the dynamical phase of the gluino to solve the strong CP problem is shown to admit a specific realization in terms of fundamental singlet superfields, such that the breaking of supersymmetry occurs only at the TeV scale, despite the large axion scale of 10^{9} to 10^{12} GeV. Phenomenological implications are discussed. |
1609.00233 | Zhi-Gang Wang | Zhi-Gang Wang, Jun-Xia Zhang | Analysis of the tensor-tensor type scalar tetraquark states with QCD sum
rules | 12 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1607.04840 | Eur. Phys. J. C76 (2016) 650 | 10.1140/epjc/s10052-016-4514-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we study the ground states and the first radial excited
states of the tensor-tensor type scalar hidden-charm tetraquark states with the
QCD sum rules. We separate the ground state contributions from the first radial
excited state contributions unambiguously, and obtain the QCD sum rules for the
ground states and the first radial excited states, respectively. Then we search
for the Borel parameters and continuum threshold parameters according to four
criteria and obtain the masses of the tensor-tensor type scalar hidden-charm
tetraquark states, which can be confronted to the experimental data in the
future.
| [
{
"created": "Thu, 1 Sep 2016 13:43:55 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2016 02:12:11 GMT",
"version": "v2"
}
] | 2016-11-29 | [
[
"Wang",
"Zhi-Gang",
""
],
[
"Zhang",
"Jun-Xia",
""
]
] | In this article, we study the ground states and the first radial excited states of the tensor-tensor type scalar hidden-charm tetraquark states with the QCD sum rules. We separate the ground state contributions from the first radial excited state contributions unambiguously, and obtain the QCD sum rules for the ground states and the first radial excited states, respectively. Then we search for the Borel parameters and continuum threshold parameters according to four criteria and obtain the masses of the tensor-tensor type scalar hidden-charm tetraquark states, which can be confronted to the experimental data in the future. |
1203.5343 | Stefano Carignano | Stefano Carignano and Michael Buballa | Two-dimensional chiral crystals in the NJL model | 12 pages, 6 figures. v2: added figure, small modifications, matches
published version | null | 10.1103/PhysRevD.86.074018 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the phase structure of the Nambu--Jona-Lasinio model at zero
temperature, allowing for a two-dimensional spatial dependence of the chiral
condensate. Applying the mean-field approximation, we consider various periodic
structures with rectangular and hexagonal geometries, and minimize the
corresponding free energy. We find that these two-dimensional chiral crystals
are favored over homogeneous phases in a certain window in the region where the
phase transition would take place when the analysis was restricted to
homogeneous condensates. It turns out, however, that in this regime they are
disfavored against a phase with a one-dimensional modulation of the chiral
condensate. On the other hand, we find that square and hexagonal lattices
eventually get favored at higher chemical potentials. Although stretching the
limits of the model to some extent, this would support predictions from
quarkyonic-matter studies.
| [
{
"created": "Fri, 23 Mar 2012 20:00:27 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Oct 2012 18:08:59 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Carignano",
"Stefano",
""
],
[
"Buballa",
"Michael",
""
]
] | We investigate the phase structure of the Nambu--Jona-Lasinio model at zero temperature, allowing for a two-dimensional spatial dependence of the chiral condensate. Applying the mean-field approximation, we consider various periodic structures with rectangular and hexagonal geometries, and minimize the corresponding free energy. We find that these two-dimensional chiral crystals are favored over homogeneous phases in a certain window in the region where the phase transition would take place when the analysis was restricted to homogeneous condensates. It turns out, however, that in this regime they are disfavored against a phase with a one-dimensional modulation of the chiral condensate. On the other hand, we find that square and hexagonal lattices eventually get favored at higher chemical potentials. Although stretching the limits of the model to some extent, this would support predictions from quarkyonic-matter studies. |
hep-ph/0507099 | Wolfgang Kilian | W. Kilian and J. Reuter | Resonances and Electroweak Observables at the ILC | 6pp. To appear in the proceedings of International Conference on
Linear Colliders (LCWS 05), Stanford, USA, 18-22 Mar 2005 | null | null | DESY 05-115 | hep-ph | null | Precise measurements of the interactions of electroweak vector bosons at the
ILC yield information about the physics of electroweak symmetry breaking. In
order to combine this with the possible observation of new resonances or the
effects of new strong interactions at the LHC, we need to relate resonance
parameters with low-energy observables. We derive these relations for a generic
setup and draw conclusions about the new-physics reach of the ILC in the
electroweak sector.
| [
{
"created": "Fri, 8 Jul 2005 07:45:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kilian",
"W.",
""
],
[
"Reuter",
"J.",
""
]
] | Precise measurements of the interactions of electroweak vector bosons at the ILC yield information about the physics of electroweak symmetry breaking. In order to combine this with the possible observation of new resonances or the effects of new strong interactions at the LHC, we need to relate resonance parameters with low-energy observables. We derive these relations for a generic setup and draw conclusions about the new-physics reach of the ILC in the electroweak sector. |
2408.03011 | Guo-Li Wang | Xin-Yao Du, Su-Yan Pe, Wei Li, Man Jia, Qiang Li, Tianhong Wang,
Guo-Li Wang | $\eta_{_{c2}}(^1D_{_2})$ and its electromagnetic decays | 20 pages, 4 figures, 6 tables | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spin-singlet state $\eta_{_{c2}}(^1D_{_2})$ has not been discovered in
experiment and it is the only missing low-excited $D$-wave charmonium, so in
this paper, we like to study its properties. Using the Bethe-Salpeter equation
method, we obtain its mass as $3828.2$ MeV and its electromagnetic decay widths
as $\Gamma[\eta_{_{c2}}(1D)\rightarrow h_{_{c}}(1P)\gamma]=284$ keV,
$\Gamma[\eta_{_{c2}}(1D)\rightarrow J/\psi\gamma]=1.04$ keV,
$\Gamma[\eta_{_{c2}}(1D)\rightarrow\psi(2S)\gamma]=3.08$ eV, and
$\Gamma[\eta_{_{c2}}(1D)\rightarrow\psi(3770)\gamma]=0.143$ keV. We estimate
its full width to be about $366$ keV, and point out that the electromagnetic
decay partial width is very sensitive to its mass and show the variation of the
width along with the mass in the range of $3800\sim3872$ MeV. In our
calculation, the emphasis is put on the relativistic corrections. Our results
show that $\eta_{_{c2}}\rightarrow h_{_{c}}\gamma$ is the non-relativistic $E1$
transition dominated $E1+M2+E3$ decay, and $\eta_{_{c2}}\rightarrow \psi\gamma$
is the $M1+E2+M3+E4$ decay but the relativistic $E2$ transition contributes the
most.
| [
{
"created": "Tue, 6 Aug 2024 07:45:07 GMT",
"version": "v1"
}
] | 2024-08-07 | [
[
"Du",
"Xin-Yao",
""
],
[
"Pe",
"Su-Yan",
""
],
[
"Li",
"Wei",
""
],
[
"Jia",
"Man",
""
],
[
"Li",
"Qiang",
""
],
[
"Wang",
"Tianhong",
""
],
[
"Wang",
"Guo-Li",
""
]
] | The spin-singlet state $\eta_{_{c2}}(^1D_{_2})$ has not been discovered in experiment and it is the only missing low-excited $D$-wave charmonium, so in this paper, we like to study its properties. Using the Bethe-Salpeter equation method, we obtain its mass as $3828.2$ MeV and its electromagnetic decay widths as $\Gamma[\eta_{_{c2}}(1D)\rightarrow h_{_{c}}(1P)\gamma]=284$ keV, $\Gamma[\eta_{_{c2}}(1D)\rightarrow J/\psi\gamma]=1.04$ keV, $\Gamma[\eta_{_{c2}}(1D)\rightarrow\psi(2S)\gamma]=3.08$ eV, and $\Gamma[\eta_{_{c2}}(1D)\rightarrow\psi(3770)\gamma]=0.143$ keV. We estimate its full width to be about $366$ keV, and point out that the electromagnetic decay partial width is very sensitive to its mass and show the variation of the width along with the mass in the range of $3800\sim3872$ MeV. In our calculation, the emphasis is put on the relativistic corrections. Our results show that $\eta_{_{c2}}\rightarrow h_{_{c}}\gamma$ is the non-relativistic $E1$ transition dominated $E1+M2+E3$ decay, and $\eta_{_{c2}}\rightarrow \psi\gamma$ is the $M1+E2+M3+E4$ decay but the relativistic $E2$ transition contributes the most. |
hep-ph/0501011 | Valentin Zakharov | V.I. Zakharov | Dual string from lattice Yang-Mills theory | 11 pages,based on the talks presented at the conferences ``Quark
Confinement and the Hadron Spectrum VI'' (Village Tanka, September 2004) and
``QCD and String Theory'' (Santa Barbara, November 2004) | null | 10.1063/1.1920945 | NSF-KITP-04-137, MPP-2004-174 | hep-ph | null | We review properties of lower-dimension vacuum defects observed in lattice
simulations of SU(2) Yang-Mills theories. One- and two-dimensional defects are
associated with ultraviolet divergent action. The action is the same divergent
as in perturbation theory but the fluctuations extend over submanifolds of the
whole 4d space. The action is self tuned to a divergent entropy and the 2d
defects can be thought of as dual strings populated with particles. The newly
emerging 3d defects are closely related to the confinement mechanism. Namely,
there is a kind of holography so that information on the confinement is encoded
in a 3d submanifold. We introduce an SU(2) invariant classification scheme
which allows for a unified description of d=1,2,3 defects. The scheme fits
known data and predicts that the 3d defects are related to chiral symmetry
breaking. Relation to stochastic vacuum model is briefly discussed as well.
| [
{
"created": "Mon, 3 Jan 2005 19:43:22 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Zakharov",
"V. I.",
""
]
] | We review properties of lower-dimension vacuum defects observed in lattice simulations of SU(2) Yang-Mills theories. One- and two-dimensional defects are associated with ultraviolet divergent action. The action is the same divergent as in perturbation theory but the fluctuations extend over submanifolds of the whole 4d space. The action is self tuned to a divergent entropy and the 2d defects can be thought of as dual strings populated with particles. The newly emerging 3d defects are closely related to the confinement mechanism. Namely, there is a kind of holography so that information on the confinement is encoded in a 3d submanifold. We introduce an SU(2) invariant classification scheme which allows for a unified description of d=1,2,3 defects. The scheme fits known data and predicts that the 3d defects are related to chiral symmetry breaking. Relation to stochastic vacuum model is briefly discussed as well. |
1609.06412 | Surender Verma Ph. D. | Surender Verma and Shankita Bhardwaj | Probing Non-unitary $CP$ Violation effects in Neutrino Oscillation
Experiments | 9 pages, 2 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we have considered minimal unitarity violation(MUV)
scheme, to obtain the general expression for $\nu_{\mu}\rightarrow\nu_{\tau}$
oscillation probability, in vacuum. For this channel, we have investigated the
sensitivities to non-unitary parameters $|\rho_{\mu\tau}|$ and
$\omega_{\mu\tau}$ with short baseline(SBL) experiments for normal as well as
inverted hierarchical neutrino masses. We also check how the sensitivity to
non-unitary parameters get modified for $\theta_{23}$ above and below
maximality. We find that the $3\sigma$ sensitivity towards $|\rho_{\mu\tau}|$
is maximum for non-unitary phase $\omega_{\mu\tau}=0$, whereas it is minimum
for $\omega_{\mu\tau}=\pm\pi$ in case of normal hierarchy(NH). However, the
sensitivity is minimum at $\omega_{\mu\tau}=0$ and maximum for
$\omega_{\mu\tau}=\pm\pi$ for inverted hierarchy(IH). We observe that for
unitary $CP$ phase $\delta=0$ and $\delta=\pi/2$, the sensitivity to measure
non-unitarity remains same in both the cases. We, also, explore wide range of
$L/E$ to forecast, in principle, the possibilities to observe $CP$-violation
due to unitary($\delta$) and non-unitary($\omega_{\mu\tau}$) phases. We find
that the both phases can be disentangled, in principle, from each other, for
the $L/E$ range less than 200 km/GeV for $\nu_{\mu}\rightarrow\nu_{\tau}$
channel.
| [
{
"created": "Wed, 21 Sep 2016 03:21:07 GMT",
"version": "v1"
}
] | 2016-09-22 | [
[
"Verma",
"Surender",
""
],
[
"Bhardwaj",
"Shankita",
""
]
] | In the present work, we have considered minimal unitarity violation(MUV) scheme, to obtain the general expression for $\nu_{\mu}\rightarrow\nu_{\tau}$ oscillation probability, in vacuum. For this channel, we have investigated the sensitivities to non-unitary parameters $|\rho_{\mu\tau}|$ and $\omega_{\mu\tau}$ with short baseline(SBL) experiments for normal as well as inverted hierarchical neutrino masses. We also check how the sensitivity to non-unitary parameters get modified for $\theta_{23}$ above and below maximality. We find that the $3\sigma$ sensitivity towards $|\rho_{\mu\tau}|$ is maximum for non-unitary phase $\omega_{\mu\tau}=0$, whereas it is minimum for $\omega_{\mu\tau}=\pm\pi$ in case of normal hierarchy(NH). However, the sensitivity is minimum at $\omega_{\mu\tau}=0$ and maximum for $\omega_{\mu\tau}=\pm\pi$ for inverted hierarchy(IH). We observe that for unitary $CP$ phase $\delta=0$ and $\delta=\pi/2$, the sensitivity to measure non-unitarity remains same in both the cases. We, also, explore wide range of $L/E$ to forecast, in principle, the possibilities to observe $CP$-violation due to unitary($\delta$) and non-unitary($\omega_{\mu\tau}$) phases. We find that the both phases can be disentangled, in principle, from each other, for the $L/E$ range less than 200 km/GeV for $\nu_{\mu}\rightarrow\nu_{\tau}$ channel. |
1905.02742 | Carlos Granados | Carlos Granados, Christian Weiss | Partonic angular momentum in the nucleon's chiral periphery | 6 pages, 2 figures | null | 10.1016/j.physletb.2019.134847 | JLAB-THY-19-2928 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the nucleon's partonic angular momentum (AM) content at peripheral
transverse distances $b = \mathcal{O}(M_\pi^{-1})$, where the structure is
governed by chiral dynamics. We compute the nucleon form factors of the
energy-momentum tensor in chiral effective field theory (ChEFT) and construct
the transverse densities of AM at fixed light-front time. In the periphery the
spin density is suppressed, and the AM is predominantly orbital. In the
first-quantized representation of ChEFT in light-front form, the
field-theoretical AM density coincides with the quantum-mechanical orbital AM
density of the soft pions in the nucleon's periphery.
| [
{
"created": "Tue, 7 May 2019 18:05:06 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Granados",
"Carlos",
""
],
[
"Weiss",
"Christian",
""
]
] | We study the nucleon's partonic angular momentum (AM) content at peripheral transverse distances $b = \mathcal{O}(M_\pi^{-1})$, where the structure is governed by chiral dynamics. We compute the nucleon form factors of the energy-momentum tensor in chiral effective field theory (ChEFT) and construct the transverse densities of AM at fixed light-front time. In the periphery the spin density is suppressed, and the AM is predominantly orbital. In the first-quantized representation of ChEFT in light-front form, the field-theoretical AM density coincides with the quantum-mechanical orbital AM density of the soft pions in the nucleon's periphery. |
2402.17859 | Howard Baer | Howard Baer, Vernon Barger, Dakotah Martinez and Shadman Salam | Weak scale supersymmetry emergent from the string landscape | 16 pages with 6 .png figures; submitted for 80th birthday volume of
Entropy honoring Paul Frampton | null | null | OU-HEP-240301 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Superstring flux compactifications can stabilize all moduli while leading to
an enormous number of vacua solutions, each leading to different $4-d$ laws of
physics. While the string landscape provides at present the only plausible
explanation for the size of the cosmological constant, it may also predict the
form of weak scale supersymmetry which is expected to emerge. Rather general
arguments suggest a power-law draw to large soft terms, but these are subject
to an anthropic selection of not-too-large a value for the weak scale. The
combined selection allows one to compute relative probabilities for the
emergence of supersymmetric models from the landscape. Models with weak scale
naturalness appear most likely to emerge since they have the largest parameter
space on the landscape. For finetuned models such as high scale SUSY or split
SUSY, the required weak scale finetuning shrinks their parameter space to tiny
volumes, making them much less likely to appear compared to natural models.
Probability distributions for sparticle and Higgs masses from natural models
show a preference for Higgs mass $m_h\sim 125$ GeV with sparticles typically
beyond present LHC limits, in accord with data. From these considerations, we
briefly describe how natural SUSY is expected to be revealed at future LHC
upgrades. This article is a contribution to the Special Edition of the journal
{\it Entropy} honoring Paul Frampton on his 80th birthday.
| [
{
"created": "Tue, 27 Feb 2024 19:48:44 GMT",
"version": "v1"
}
] | 2024-02-29 | [
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Martinez",
"Dakotah",
""
],
[
"Salam",
"Shadman",
""
]
] | Superstring flux compactifications can stabilize all moduli while leading to an enormous number of vacua solutions, each leading to different $4-d$ laws of physics. While the string landscape provides at present the only plausible explanation for the size of the cosmological constant, it may also predict the form of weak scale supersymmetry which is expected to emerge. Rather general arguments suggest a power-law draw to large soft terms, but these are subject to an anthropic selection of not-too-large a value for the weak scale. The combined selection allows one to compute relative probabilities for the emergence of supersymmetric models from the landscape. Models with weak scale naturalness appear most likely to emerge since they have the largest parameter space on the landscape. For finetuned models such as high scale SUSY or split SUSY, the required weak scale finetuning shrinks their parameter space to tiny volumes, making them much less likely to appear compared to natural models. Probability distributions for sparticle and Higgs masses from natural models show a preference for Higgs mass $m_h\sim 125$ GeV with sparticles typically beyond present LHC limits, in accord with data. From these considerations, we briefly describe how natural SUSY is expected to be revealed at future LHC upgrades. This article is a contribution to the Special Edition of the journal {\it Entropy} honoring Paul Frampton on his 80th birthday. |
1110.2908 | Robert Foot | R. Foot | Diurnal modulation due to self-interacting mirror and hidden sector dark
matter | About 20 pages, minor changes, matches published version | null | 10.1088/1475-7516/2012/04/014 | null | hep-ph astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mirror and more generic hidden sector dark matter models can simultaneously
explain the DAMA, CoGeNT and CRESST dark matter signals consistently with the
null results of the other experiments. This type of dark matter can be captured
by the Earth and shield detectors because it is self-interacting. This effect
will lead to a diurnal modulation in dark matter detectors. We estimate the
size of this effect for dark matter detectors in various locations. For a
detector located in the northern hemisphere, this effect is expected to peak in
April and can be detected for optimistic parameter choices. The diurnal
variation is expected to be much larger for detectors located in the southern
hemisphere. In particular, if the CoGeNT detector were moved to e.g. Sierra
Grande, Argentina then a $5 \sigma$ dark matter discovery would be possible in
around 30 days of operation.
| [
{
"created": "Thu, 13 Oct 2011 12:14:53 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Nov 2011 02:09:14 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Mar 2012 01:32:42 GMT",
"version": "v3"
},
{
"created": "Tue, 17 Apr 2012 08:26:08 GMT",
"version": "v4"
}
] | 2015-05-30 | [
[
"Foot",
"R.",
""
]
] | Mirror and more generic hidden sector dark matter models can simultaneously explain the DAMA, CoGeNT and CRESST dark matter signals consistently with the null results of the other experiments. This type of dark matter can be captured by the Earth and shield detectors because it is self-interacting. This effect will lead to a diurnal modulation in dark matter detectors. We estimate the size of this effect for dark matter detectors in various locations. For a detector located in the northern hemisphere, this effect is expected to peak in April and can be detected for optimistic parameter choices. The diurnal variation is expected to be much larger for detectors located in the southern hemisphere. In particular, if the CoGeNT detector were moved to e.g. Sierra Grande, Argentina then a $5 \sigma$ dark matter discovery would be possible in around 30 days of operation. |
hep-ph/9411398 | null | Saurabh D. Rindani | CP violation at colliders | 20 pages, latex, no figures (only revision is the comment that the
article is based on a talk presented at WHEPP3, Madras, January 1994) | Pramana 45:S263-S276,1995 | 10.1007/BF02907978 | PRL-TH-94/35 | hep-ph | null | The prospects of experimental detection of $CP$ violation at $e^+e^-$ and
$pp/p\overline{p}$ colliders are reviewed. After a general discussion on the
quantities which can measure $CP$ violation and on the implications of the
$CPT$ theorem, various possibilities of measuring $CP$ violation arising
outside the standard model are taken up. $CP$ violation in leptonic processes,
especially polarization effects in $e^+e^-\rightarrow l^+l^-$ are discussed
next. $CP$ violation in $t\overline{t}$ and $W^+W^-$ production and decay is
also described. (Based on talk presented at the WHEPP3, Madras, January 1994).
| [
{
"created": "Wed, 23 Nov 1994 05:39:49 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 1994 07:54:29 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Rindani",
"Saurabh D.",
""
]
] | The prospects of experimental detection of $CP$ violation at $e^+e^-$ and $pp/p\overline{p}$ colliders are reviewed. After a general discussion on the quantities which can measure $CP$ violation and on the implications of the $CPT$ theorem, various possibilities of measuring $CP$ violation arising outside the standard model are taken up. $CP$ violation in leptonic processes, especially polarization effects in $e^+e^-\rightarrow l^+l^-$ are discussed next. $CP$ violation in $t\overline{t}$ and $W^+W^-$ production and decay is also described. (Based on talk presented at the WHEPP3, Madras, January 1994). |
hep-ph/9804437 | Dumitru Ghilencea | G.Amelino-Camelia (1,2), D. Ghilencea (1), G. G. Ross (1) ((1) Oxford
University, (2) Neuchatel University) | The effect of Yukawa couplings on Unification Predictions and the
non-perturbative limit | 20 pages, LaTeX, no figures., submitted to Nucl.Phys.B | Nucl.Phys. B528 (1998) 35-58 | 10.1016/S0550-3213(98)00470-2 | OUTP-98-09P(1998) | hep-ph hep-th | null | We investigate the effects of Yukawa couplings on the phenomenological
predictions for a class of supersymmetric models which allows for the presence
of complete SU(5) multiplets in addition to the Minimal Supersymmetric Standard
Model spectrum. We develop a two loop analytical approach to quantify the
predictions for gauge unification including Yukawa couplings. The effects of
the heavy thresholds of the model are also included. In some cases accurate
predictions can be made for the unification scale, irrespective of the initial
(unknown) Yukawa couplings, so long as perturbation theory remains valid. We
also consider the limit of a large number of extra states and compute the
predictions in a resummed perturbation series approach to show that the results
are stable in this limit. Finally we consider the possibility of making
predictions for the case the gauge and Yukawa couplings enter the
non-perturbative domain below the unification scale and estimate the errors
which affect these predictions.
| [
{
"created": "Tue, 28 Apr 1998 13:20:32 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 1998 16:48:08 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Amelino-Camelia",
"G.",
""
],
[
"Ghilencea",
"D.",
""
],
[
"Ross",
"G. G.",
""
]
] | We investigate the effects of Yukawa couplings on the phenomenological predictions for a class of supersymmetric models which allows for the presence of complete SU(5) multiplets in addition to the Minimal Supersymmetric Standard Model spectrum. We develop a two loop analytical approach to quantify the predictions for gauge unification including Yukawa couplings. The effects of the heavy thresholds of the model are also included. In some cases accurate predictions can be made for the unification scale, irrespective of the initial (unknown) Yukawa couplings, so long as perturbation theory remains valid. We also consider the limit of a large number of extra states and compute the predictions in a resummed perturbation series approach to show that the results are stable in this limit. Finally we consider the possibility of making predictions for the case the gauge and Yukawa couplings enter the non-perturbative domain below the unification scale and estimate the errors which affect these predictions. |
hep-ph/9509371 | David Kaplan | David B. Kaplan, Martin J. Savage | The Spin-Flavor Dependence of Nuclear Forces from Large-N QCD | Discussion of the form of the Savage-Wise coefficients corrected;
reference added | Phys.Lett.B365:244-251,1996 | 10.1016/0370-2693(95)01277-X | DOE/ER/40561-230-INT95-00-104, CMU-HEP95-13 | hep-ph nucl-th | null | We show that nuclear interactions are SU(4) symmetric at leading order in
chiral perturbation theory in the large-N limit of QCD. The nucleons and delta
resonances form a 20-dimensional representation of SU(4) and we show how
Wigner's supermultiplet symmetry SU(4)_{sm}, under which the nucleons transform
as a 4-dimensional representation, follows as an accidental low energy
symmetry. Exploiting SU(4) symmetry allows one to express the 18 independent
leading nucleon, delta interaction operators invariant under spin and isospin
symmetries in terms of only two couplings. The three flavor analogue allows one
to express the 28 leading octet, decuplet interactions also in terms of only
two couplings, which has implications for hypernuclei and strangeness in
``neutron'' stars.
| [
{
"created": "Fri, 22 Sep 1995 22:33:15 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 1995 21:28:10 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Oct 1995 00:19:52 GMT",
"version": "v3"
}
] | 2019-08-15 | [
[
"Kaplan",
"David B.",
""
],
[
"Savage",
"Martin J.",
""
]
] | We show that nuclear interactions are SU(4) symmetric at leading order in chiral perturbation theory in the large-N limit of QCD. The nucleons and delta resonances form a 20-dimensional representation of SU(4) and we show how Wigner's supermultiplet symmetry SU(4)_{sm}, under which the nucleons transform as a 4-dimensional representation, follows as an accidental low energy symmetry. Exploiting SU(4) symmetry allows one to express the 18 independent leading nucleon, delta interaction operators invariant under spin and isospin symmetries in terms of only two couplings. The three flavor analogue allows one to express the 28 leading octet, decuplet interactions also in terms of only two couplings, which has implications for hypernuclei and strangeness in ``neutron'' stars. |
hep-ph/0608114 | Ingrid Kraus | I. Kraus, J. Cleymans, H. Oeschler, K. Redlich, S. Wheaton | Statistical Model Predictions for Pb-Pb Collisions at LHC | 5 pages, 2 figures, 1 table, SQM 2006 conference proceedings,
accepted for publication in J. Phys. G | J.Phys. G32 (2006) S495-S498 | 10.1088/0954-3899/32/12/S63 | null | hep-ph | null | The systematics of Statistical Model parameters extracted from heavy-ion
collisions at lower energies are exploited to extrapolate in the LHC regime.
Predictions of various particle ratios are presented and particle production in
central Pb-Pb collisions at LHC is discussed in the context of the Statistical
Model. The sensitivity of several ratios on the temperature and the baryon
chemical potential is studied in detail, and some of them, which are
particularly appropriate to determine the chemical freeze-out point
experimentally, are indicated. The impact of feed-down contributions from
resonances, especially to light hadrons, is illustrated.
| [
{
"created": "Thu, 10 Aug 2006 12:48:46 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Kraus",
"I.",
""
],
[
"Cleymans",
"J.",
""
],
[
"Oeschler",
"H.",
""
],
[
"Redlich",
"K.",
""
],
[
"Wheaton",
"S.",
""
]
] | The systematics of Statistical Model parameters extracted from heavy-ion collisions at lower energies are exploited to extrapolate in the LHC regime. Predictions of various particle ratios are presented and particle production in central Pb-Pb collisions at LHC is discussed in the context of the Statistical Model. The sensitivity of several ratios on the temperature and the baryon chemical potential is studied in detail, and some of them, which are particularly appropriate to determine the chemical freeze-out point experimentally, are indicated. The impact of feed-down contributions from resonances, especially to light hadrons, is illustrated. |
hep-ph/9502286 | null | Giulia Ricciardi | Short and Long Distance Interplay in Inclusive $ B \to X_d \gamma $
Decays | content and results UNCHANGED: only shortened, to fit Phys. Lett. B
standards; 9 pages, latex | Phys.Lett.B355:313-317,1995 | 10.1016/0370-2693(95)00733-2 | HUTP-94/A037, DSF-T-95/2 | hep-ph | null | We analyze the short and long distance contributions to inclusive $B
\rightarrow X_d \gamma$ decay, paying particular attention to the dependence on
the Cabibbo-Kobayashi-Maskawa parameter $V_{td}$. We discuss penguin diagrams
with internal $u$ and $c$ quarks in the framework of the effective field
theory. We also estimate the size of possible long range contributions by using
vector meson dominance.
| [
{
"created": "Mon, 13 Feb 1995 16:24:48 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 1995 10:52:58 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Ricciardi",
"Giulia",
""
]
] | We analyze the short and long distance contributions to inclusive $B \rightarrow X_d \gamma$ decay, paying particular attention to the dependence on the Cabibbo-Kobayashi-Maskawa parameter $V_{td}$. We discuss penguin diagrams with internal $u$ and $c$ quarks in the framework of the effective field theory. We also estimate the size of possible long range contributions by using vector meson dominance. |
hep-ph/0002130 | Gregory Moreau | G. Moreau, E. Perez, G. Polesello | The three-leptons signature from resonant sneutrino production at the
LHC | 7 pages, 6 figures, Latex file. Proceedings of the Workshop `Physics
at TeV Colliders', 8-18 June, 1999, Les Houches, France | null | null | t00/015 | hep-ph | null | The resonant production of sneutrinos at the LHC via the R-parity violating
couplings $\l '_{ijk} L_i Q_j D^c_k$ is studied through its three-leptons
signature. A detailed particle level study of signal and background is
performed using a fast simulation of the ATLAS detector. Through the full
reconstruction of the cascade decay, a model-independent and precise
measurement of the masses of the involved sparticles can be performed. Besides,
this signature can be detected in a large part of the SUSY parameter space and
for wide ranges of values of several $\l '_{ijk}$ coupling constants.
| [
{
"created": "Fri, 11 Feb 2000 14:36:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moreau",
"G.",
""
],
[
"Perez",
"E.",
""
],
[
"Polesello",
"G.",
""
]
] | The resonant production of sneutrinos at the LHC via the R-parity violating couplings $\l '_{ijk} L_i Q_j D^c_k$ is studied through its three-leptons signature. A detailed particle level study of signal and background is performed using a fast simulation of the ATLAS detector. Through the full reconstruction of the cascade decay, a model-independent and precise measurement of the masses of the involved sparticles can be performed. Besides, this signature can be detected in a large part of the SUSY parameter space and for wide ranges of values of several $\l '_{ijk}$ coupling constants. |
1406.1172 | Andrey Katz | Andrey Katz, Matthew Reece, and Aqil Sajjad | Naturalness, b to s gamma, and SUSY Heavy Higgses | 29 pages, 10 figures. V2: minor changes, accepted by JHEP | null | 10.1007/JHEP10(2014)102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore naturalness constraints on the masses of the heavy Higgs bosons
H^0, H^+/-, and A^0 in supersymmetric theories. We show that, in any extension
of MSSM which accommodates the 125 GeV Higgs at the tree level, one can derive
an upper bound on the SUSY Higgs masses from naturalness considerations. As is
well-known for the MSSM, these bounds become weak at large tan beta. However,
we show that measurements of b to s gamma together with naturalness arguments
lead to an upper bound on tan beta, strengthening the naturalness case for
heavy Higgs states near the TeV scale. The precise bound depends somewhat on
the SUSY mediation scale: allowing a factor of 10 tuning in the stop sector,
the measured rate of b to s gamma implies tan beta < 30 for running down from
10 TeV but tan beta < 4 for mediation at or above 100 TeV, placing m_A near the
TeV scale for natural EWSB. Because the signatures of heavy Higgs bosons at
colliders are less susceptible to being "hidden" than standard superpartner
signatures, there is a strong motivation to make heavy Higgs searches a key
part of the LHC's search for naturalness. In an appendix we comment on how the
Goldstone boson equivalence theorem links the rates for H to hh and H to ZZ
signatures.
| [
{
"created": "Wed, 4 Jun 2014 20:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2014 14:25:27 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Katz",
"Andrey",
""
],
[
"Reece",
"Matthew",
""
],
[
"Sajjad",
"Aqil",
""
]
] | We explore naturalness constraints on the masses of the heavy Higgs bosons H^0, H^+/-, and A^0 in supersymmetric theories. We show that, in any extension of MSSM which accommodates the 125 GeV Higgs at the tree level, one can derive an upper bound on the SUSY Higgs masses from naturalness considerations. As is well-known for the MSSM, these bounds become weak at large tan beta. However, we show that measurements of b to s gamma together with naturalness arguments lead to an upper bound on tan beta, strengthening the naturalness case for heavy Higgs states near the TeV scale. The precise bound depends somewhat on the SUSY mediation scale: allowing a factor of 10 tuning in the stop sector, the measured rate of b to s gamma implies tan beta < 30 for running down from 10 TeV but tan beta < 4 for mediation at or above 100 TeV, placing m_A near the TeV scale for natural EWSB. Because the signatures of heavy Higgs bosons at colliders are less susceptible to being "hidden" than standard superpartner signatures, there is a strong motivation to make heavy Higgs searches a key part of the LHC's search for naturalness. In an appendix we comment on how the Goldstone boson equivalence theorem links the rates for H to hh and H to ZZ signatures. |
1603.05783 | Kenji Kadota | Paolo Gondolo and Kenji Kadota | Late Kinetic Decoupling of Light Magnetic Dipole Dark Matter | 14 pages, 2 figures | null | 10.1088/1475-7516/2016/06/012 | CTPU-16-08 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the kinetic decoupling of light (lesssim 10 GeV) magnetic dipole
dark matter (DM). We find that present bounds from collider, direct DM
searches, and structure formation allow magnetic dipole DM to remain in thermal
equilibrium with the early universe plasma until as late as the
electron-positron annihilation epoch. This late kinetic decoupling leads to a
minimal mass for the earliest dark protohalos of thousands of solar masses, in
contrast to the conventional weak scale DM scenario where they are of order
10^{-6} solar masses.
| [
{
"created": "Fri, 18 Mar 2016 07:18:11 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Mar 2016 16:19:09 GMT",
"version": "v2"
}
] | 2016-06-15 | [
[
"Gondolo",
"Paolo",
""
],
[
"Kadota",
"Kenji",
""
]
] | We study the kinetic decoupling of light (lesssim 10 GeV) magnetic dipole dark matter (DM). We find that present bounds from collider, direct DM searches, and structure formation allow magnetic dipole DM to remain in thermal equilibrium with the early universe plasma until as late as the electron-positron annihilation epoch. This late kinetic decoupling leads to a minimal mass for the earliest dark protohalos of thousands of solar masses, in contrast to the conventional weak scale DM scenario where they are of order 10^{-6} solar masses. |
2012.11462 | Jean-Philippe Lansberg | Aleksander Kusina, Jean-Philippe Lansberg, Ingo Schienbein, Hua-Sheng
Shao | Reweighted nuclear PDFs using Heavy-Flavor Production Data at the LHC:
nCTEQ15_rwHF & EPPS16_rwHF | Latex, 20 pages, 20 figures, 1 table; v2: a few references added | Phys. Rev. D 104, 014010 (2021) | 10.1103/PhysRevD.104.014010 | IFJPAN-IV-2020-11 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the reweighting of two sets of nuclear PDFs, nCTEQ15 and EPPS16,
using a selection of experimental data on heavy-flavor meson [D0, J/psi, J/psi
from B and Upsilon(1S)] production in proton-lead collisions at the LHC which
were not used in the original determination of these nuclear PDFs. The
reweighted PDFs exhibit significantly smaller uncertainties thanks to these new
heavy-flavor constraints. We present a comparison with another selection of
data from the LHC and RHIC which were not included in our reweighting
procedure. The comparison is overall very good and serves as a validation of
these reweighted nuclear PDF sets, which we dub nCTEQ15_rwHF & EPPS16_rwHF.
This indicates that the LHC and forward RHIC heavy-flavor data can be described
within the standard collinear factorization framework with the same (universal)
small-x gluon distribution. We discuss how we believe such reweighted PDFs
should be used as well as the limitations of our procedure.
| [
{
"created": "Mon, 21 Dec 2020 16:27:26 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jan 2021 11:39:05 GMT",
"version": "v2"
}
] | 2021-07-21 | [
[
"Kusina",
"Aleksander",
""
],
[
"Lansberg",
"Jean-Philippe",
""
],
[
"Schienbein",
"Ingo",
""
],
[
"Shao",
"Hua-Sheng",
""
]
] | We present the reweighting of two sets of nuclear PDFs, nCTEQ15 and EPPS16, using a selection of experimental data on heavy-flavor meson [D0, J/psi, J/psi from B and Upsilon(1S)] production in proton-lead collisions at the LHC which were not used in the original determination of these nuclear PDFs. The reweighted PDFs exhibit significantly smaller uncertainties thanks to these new heavy-flavor constraints. We present a comparison with another selection of data from the LHC and RHIC which were not included in our reweighting procedure. The comparison is overall very good and serves as a validation of these reweighted nuclear PDF sets, which we dub nCTEQ15_rwHF & EPPS16_rwHF. This indicates that the LHC and forward RHIC heavy-flavor data can be described within the standard collinear factorization framework with the same (universal) small-x gluon distribution. We discuss how we believe such reweighted PDFs should be used as well as the limitations of our procedure. |
hep-ph/0503006 | Olga Piskounova I. | O. I. Piskounova (1) and N. V. Nikitin (2) ((1) Lebedev Physics
Institute, Moscow (2) SINP Moscow State University) | Production and Decay of Charmed Baryons: Spectra of Muons and Asymmetry
between mu+ and mu- | 10 pages, 4 epsfigures, ReVTeX, included in the Proceeding of
QFHEP04, Peterhof, Russia, 2004; submitted to Phys. At. Nucl. (2005) | Phys.Atom.Nucl.68:2124,2005; Yad.Fiz.68:2186-2190,2005 | 10.1134/1.2149092 | null | hep-ph | null | The calculation of muon spectra from the decay of Lambda_c baryons was
carried out on the basis of the description of recent data on charmed-baryon
production in hadronic interactions. Data are described in the framework of
Quark--Gluon String Model that allowes us to consider primary proton
interactions of arbitrary high energy. MC code was built for charmed-baryon
semileptonic decay in order to obtain the kinematical characteristics of
resulting particles. It is predicted that the charge asymmetry between energy
spectra of mu+ and mu- in laboratory system is clearly seen as the consequence
of asymmetry between the spectra of charmed baryons and antibaryons.This
extension of QGS Model can be useful to correct the calculations of muon and
neutrino spectra in astrophysics.
| [
{
"created": "Tue, 1 Mar 2005 12:02:52 GMT",
"version": "v1"
}
] | 2010-03-04 | [
[
"Piskounova",
"O. I.",
""
],
[
"Nikitin",
"N. V.",
""
]
] | The calculation of muon spectra from the decay of Lambda_c baryons was carried out on the basis of the description of recent data on charmed-baryon production in hadronic interactions. Data are described in the framework of Quark--Gluon String Model that allowes us to consider primary proton interactions of arbitrary high energy. MC code was built for charmed-baryon semileptonic decay in order to obtain the kinematical characteristics of resulting particles. It is predicted that the charge asymmetry between energy spectra of mu+ and mu- in laboratory system is clearly seen as the consequence of asymmetry between the spectra of charmed baryons and antibaryons.This extension of QGS Model can be useful to correct the calculations of muon and neutrino spectra in astrophysics. |
1208.6191 | Konrad Tywoniuk | Konrad Tywoniuk | Advancing QCD-based calculations of energy loss | 8 pages, 2 figures, plenary talk at the confererence "Hard Probes
2012", Cagliari, Sardinia, Italy, 27 May - 1 June 2012 | null | null | LU-TP 12-36 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a brief overview of the basics and current developments of QCD-based
calculations of radiative processes in medium. We put an emphasis on the
underlying physics concepts and discuss the theoretical uncertainties
inherently associated with the fundamental parameters to be extracted from
data. An important area of development is the study of the single-gluon
emission in medium. Moreover, establishing the correct physical picture of
multi-gluon emissions is imperative for comparison with data. We will report on
progress made in both directions and discuss perspectives for the future.
| [
{
"created": "Thu, 30 Aug 2012 14:39:45 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Oct 2012 09:16:19 GMT",
"version": "v2"
}
] | 2012-10-02 | [
[
"Tywoniuk",
"Konrad",
""
]
] | We give a brief overview of the basics and current developments of QCD-based calculations of radiative processes in medium. We put an emphasis on the underlying physics concepts and discuss the theoretical uncertainties inherently associated with the fundamental parameters to be extracted from data. An important area of development is the study of the single-gluon emission in medium. Moreover, establishing the correct physical picture of multi-gluon emissions is imperative for comparison with data. We will report on progress made in both directions and discuss perspectives for the future. |
hep-ph/0409099 | Matthew Wingate | Matthew Wingate | Lattice QCD and Flavor Physics | Invited talk presented at the XXIV Physics in Collision Conference
(PIC04), Boston, USA, June 2004, 14 pages. PSN TUET01 | null | null | INT-PUB 04-20 | hep-ph hep-ex hep-lat | null | Now that lattice QCD simulations are able to include effects of light sea
quarks, the prospects are good for constraining quark flavor phenomenology.
This review talk for particle physics experimentalists begins with an
introduction intended to describe broadly the steps of lattice Monte Carlo
simulations. The remainder of the talk is a brief survey of recent and ongoing
calculations relevant for quark flavor physics.
| [
{
"created": "Wed, 8 Sep 2004 19:58:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wingate",
"Matthew",
""
]
] | Now that lattice QCD simulations are able to include effects of light sea quarks, the prospects are good for constraining quark flavor phenomenology. This review talk for particle physics experimentalists begins with an introduction intended to describe broadly the steps of lattice Monte Carlo simulations. The remainder of the talk is a brief survey of recent and ongoing calculations relevant for quark flavor physics. |
hep-ph/9701349 | Andrea Romanino | Andrea Romanino | Unified theories of flavour with U(2) as horizontal group | 9 pages, lxatex2e using amstex, epsfig, epic, 1 eps figure. Talk
given at NATO Advanced Study Institute on Masses of Fundamental Particles,
Cargese, France, 5-17 Aug 1996 | null | null | IFUP-TH 5/97 | hep-ph | null | An unified flavour model based on U(2) as flavour group is described. Besides
to explain the main characteristics of the fermion spectrum, the model is
predictive and agrees quantitatively with experimental data in flavour physics.
| [
{
"created": "Wed, 22 Jan 1997 17:30:53 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jan 1997 15:38:12 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Romanino",
"Andrea",
""
]
] | An unified flavour model based on U(2) as flavour group is described. Besides to explain the main characteristics of the fermion spectrum, the model is predictive and agrees quantitatively with experimental data in flavour physics. |
hep-ph/9404318 | Sakane | A. Ni\'egawa | Is \lq\lq Heavy Quark Damping Rate Puzzle'' in Hot QCD Really the
Puzzle? | 13pages, OCU-PHYS-154 | Phys.Rev.Lett.73:2023-2026,1994 | 10.1103/PhysRevLett.73.2023 | null | hep-ph | null | Within the framework of perturbative resummation scheme of Pisarski and
Braaten, the decay- or damping-rate of a moving heavy quark (muon) to leading
order in weak coupling in hot QCD (QED) is examined. Although, as is well
known, the conventionally-defined damping rate diverges logarithmically at the
infrared limit, shown is that no such divergence appears in the physically
measurable decay rate. The cancellation occurs between the contribution from
the \lq\lq real'' decay diagram and the contribution from the diagrams with
\lq\lq thermal radiative correction''.
| [
{
"created": "Thu, 21 Apr 1994 09:41:30 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Niégawa",
"A.",
""
]
] | Within the framework of perturbative resummation scheme of Pisarski and Braaten, the decay- or damping-rate of a moving heavy quark (muon) to leading order in weak coupling in hot QCD (QED) is examined. Although, as is well known, the conventionally-defined damping rate diverges logarithmically at the infrared limit, shown is that no such divergence appears in the physically measurable decay rate. The cancellation occurs between the contribution from the \lq\lq real'' decay diagram and the contribution from the diagrams with \lq\lq thermal radiative correction''. |
0910.0473 | Nikolaos Kidonakis | Nikolaos Kidonakis | Two-loop soft anomalous dimensions with massive and massless quarks | 8 pages, 6 figures; to be published in the proceedings of DPF-2009,
Detroit, MI, July 2009, eConf C090726 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present results for two-loop soft anomalous dimensions, which are derived
from dimensionally regularized diagrams with eikonal quark lines and control
soft-gluon emission in hard-scattering processes. Detailed results for the UV
poles of the eikonal integrals are shown for massive quarks, and the massless
limit is also taken. The construction of soft anomalous dimensions at two-loops
allows soft-gluon resummations at NNLL accuracy.
| [
{
"created": "Fri, 2 Oct 2009 20:10:02 GMT",
"version": "v1"
}
] | 2009-10-06 | [
[
"Kidonakis",
"Nikolaos",
""
]
] | I present results for two-loop soft anomalous dimensions, which are derived from dimensionally regularized diagrams with eikonal quark lines and control soft-gluon emission in hard-scattering processes. Detailed results for the UV poles of the eikonal integrals are shown for massive quarks, and the massless limit is also taken. The construction of soft anomalous dimensions at two-loops allows soft-gluon resummations at NNLL accuracy. |
1110.0989 | Vadim Naumov | Dmitry V. Naumov, Vadim A. Naumov | Neutrino Velocity Anomalies: A Resolution without a Revolution | 5 pages, 5 eps figures | null | null | null | hep-ph hep-ex physics.acc-ph quant-ph | http://creativecommons.org/licenses/by/3.0/ | We argue that the neutrino advance of time observed in MINOS and OPERA
experiments can be explained in the framework of the standard relativistic
quantum theory as a manifestation of the large effective transverse size of the
eigenmass neutrino wavepackets.
| [
{
"created": "Wed, 5 Oct 2011 14:06:35 GMT",
"version": "v1"
}
] | 2011-10-06 | [
[
"Naumov",
"Dmitry V.",
""
],
[
"Naumov",
"Vadim A.",
""
]
] | We argue that the neutrino advance of time observed in MINOS and OPERA experiments can be explained in the framework of the standard relativistic quantum theory as a manifestation of the large effective transverse size of the eigenmass neutrino wavepackets. |
2010.13680 | Weiyao Ke | Weiyao Ke, Xin-Nian Wang | QGP modification to single inclusive jets in a calibrated transport
model | 48 pages, 20 figures, prepared for submission | null | 10.1007/JHEP05(2021)041 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study inclusive jet suppression and modifications in the quark-gluon
plasma (QGP) with a transport-based model. The model includes vacuum-like
parton shower evolution at high-virtuality, a linearized transport for
jet-medium interactions, and a simple ansatz for the jet-induced hydrodynamic
response of the medium. Model parameters are calibrated to nuclear modification
factors for inclusive hadron $R_{AA}^{h}$ and single inclusive jets
$R_{AA}^{j}$ with cone size $R=0.4$ in 0-10% central Au-Au and Pb-Pb collisions
measured at the RHIC and LHC. The calibrated model consistently describes the
cone-size dependent $R_{AA}^{j}(R)$, modifications to inclusive jet
fragmentation functions and jet shape. We discuss the origin of these
modifications by analyzing the medium-induced jet energy flow in this model and
elucidate the interplay of hard parton evolution and jet-induced medium
response. In particular, we demonstrate that the excess of soft hadrons at
$p_T\sim 2$ GeV/$c$ in jet fragmentation function and jet shape at large
$r=\sqrt{\Delta \eta^2+\Delta \phi^2}$ are consequences of both soft
medium-induced gluon radiation and jet-induced medium excitation.
| [
{
"created": "Mon, 26 Oct 2020 15:58:06 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Dec 2020 06:27:57 GMT",
"version": "v2"
}
] | 2021-05-26 | [
[
"Ke",
"Weiyao",
""
],
[
"Wang",
"Xin-Nian",
""
]
] | We study inclusive jet suppression and modifications in the quark-gluon plasma (QGP) with a transport-based model. The model includes vacuum-like parton shower evolution at high-virtuality, a linearized transport for jet-medium interactions, and a simple ansatz for the jet-induced hydrodynamic response of the medium. Model parameters are calibrated to nuclear modification factors for inclusive hadron $R_{AA}^{h}$ and single inclusive jets $R_{AA}^{j}$ with cone size $R=0.4$ in 0-10% central Au-Au and Pb-Pb collisions measured at the RHIC and LHC. The calibrated model consistently describes the cone-size dependent $R_{AA}^{j}(R)$, modifications to inclusive jet fragmentation functions and jet shape. We discuss the origin of these modifications by analyzing the medium-induced jet energy flow in this model and elucidate the interplay of hard parton evolution and jet-induced medium response. In particular, we demonstrate that the excess of soft hadrons at $p_T\sim 2$ GeV/$c$ in jet fragmentation function and jet shape at large $r=\sqrt{\Delta \eta^2+\Delta \phi^2}$ are consequences of both soft medium-induced gluon radiation and jet-induced medium excitation. |
hep-ph/9801422 | Jens Erler | Jens Erler and Paul Langacker | Bounds on the Standard Higgs Boson | 6 pages of LaTeX | null | 10.1063/1.56189 | UPR-791-T | hep-ph | null | We review the status of precision electroweak physics with particular
emphasis on the extraction of the Higgs boson mass. Global fit results depend
strongly on the used value for the hadronic contribution to alpha(M_Z). We
emphasize, however, that the general tendency for a light Higgs persists when
using any of the recently obtained values for alpha(M_Z), and is also less
dependent on deviating observables such as A_LR than in the past.
| [
{
"created": "Wed, 28 Jan 1998 00:12:32 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Erler",
"Jens",
""
],
[
"Langacker",
"Paul",
""
]
] | We review the status of precision electroweak physics with particular emphasis on the extraction of the Higgs boson mass. Global fit results depend strongly on the used value for the hadronic contribution to alpha(M_Z). We emphasize, however, that the general tendency for a light Higgs persists when using any of the recently obtained values for alpha(M_Z), and is also less dependent on deviating observables such as A_LR than in the past. |
hep-ph/0010075 | Zvi Bern | Z. Bern, L. Dixon and A. Ghinculov | Two-Loop Correction to Bhabha Scattering | Latex, 22 pages, 1 figure | Phys.Rev.D63:053007,2001 | 10.1103/PhysRevD.63.053007 | SLAC--PUB--8655, UCLA/00/TEP/26 | hep-ph hep-ex | null | We present the two-loop virtual QED corrections to e^+ e^- to mu^+ mu^- and
Bhabha scattering in dimensional regularization. The results are expressed in
terms of polylogarithms. The form of the infrared divergences agrees with
previous expectations. These results are a crucial ingredient in the complete
next-to-next-to-leading order QED corrections to these processes. A future
application will be to reduce theoretical uncertainties associated with
luminosity measurements at e^+ e^- colliders. The calculation also tests
methods that may be applied to analogous QCD processes.
| [
{
"created": "Mon, 9 Oct 2000 03:23:31 GMT",
"version": "v1"
}
] | 2010-11-15 | [
[
"Bern",
"Z.",
""
],
[
"Dixon",
"L.",
""
],
[
"Ghinculov",
"A.",
""
]
] | We present the two-loop virtual QED corrections to e^+ e^- to mu^+ mu^- and Bhabha scattering in dimensional regularization. The results are expressed in terms of polylogarithms. The form of the infrared divergences agrees with previous expectations. These results are a crucial ingredient in the complete next-to-next-to-leading order QED corrections to these processes. A future application will be to reduce theoretical uncertainties associated with luminosity measurements at e^+ e^- colliders. The calculation also tests methods that may be applied to analogous QCD processes. |
hep-ph/0610114 | Covi Laura | Laura Covi | Axinos as Cold Dark Matter | 7 pages, 4 figures, contribution to the Proceedings of the
International Workshop "The dark side of the Universe", Madrid, June 2006 | null | 10.1063/1.2409080 | DESY 06-184 | hep-ph | null | The connection of Dark Matter to our particle physics model is still one of
the open cosmological questions. In these proceedings I will argue that axinos
can be successful Cold Dark Matter candidates in models with Supersymmetry and
the Peccei-Quinn solution of the strong CP problem. If they are the Lightest
Supersymmetric Particle (LSP), they can be produced in the right abundance by
thermal scatterings and out of equilibrium decays of the Next-to-Lightest
Supersymmetric Particles (NLSPs). Moreover if the NLSPs are charged, their
decay could help us understand which is the LSP, e.g. between axino and
gravitino.
| [
{
"created": "Tue, 10 Oct 2006 17:53:00 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Covi",
"Laura",
""
]
] | The connection of Dark Matter to our particle physics model is still one of the open cosmological questions. In these proceedings I will argue that axinos can be successful Cold Dark Matter candidates in models with Supersymmetry and the Peccei-Quinn solution of the strong CP problem. If they are the Lightest Supersymmetric Particle (LSP), they can be produced in the right abundance by thermal scatterings and out of equilibrium decays of the Next-to-Lightest Supersymmetric Particles (NLSPs). Moreover if the NLSPs are charged, their decay could help us understand which is the LSP, e.g. between axino and gravitino. |
0811.3267 | Yue Chongxing | Chong-Xing Yue, Jin-Yan Liu, Li Ding, Wei Liu, Wei Ma | Photon-induced production of the mirror quarks from the $LHT$ model at
the $LHC$ | 20 pages, 10 figures | Commun.Theor.Phys.52:1041-1048,2009 | 10.1088/0253-6102/52/6/13 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The photon-induced processes at the $LHC$ provide clean experimental
conditions due to absence of the proton remnants, which might produce
complementary and interesting results for tests of the standard model and for
searching of new physics. In the context of the littlest $Higgs$ model with
T-parity, we consider the photon-induced production of the mirror quarks at the
$LHC$. The cross sections for various production channels are calculated and a
simply phenomenology analysis is performed by assuming leptonic decays.
| [
{
"created": "Thu, 20 Nov 2008 06:28:06 GMT",
"version": "v1"
}
] | 2009-12-17 | [
[
"Yue",
"Chong-Xing",
""
],
[
"Liu",
"Jin-Yan",
""
],
[
"Ding",
"Li",
""
],
[
"Liu",
"Wei",
""
],
[
"Ma",
"Wei",
""
]
] | The photon-induced processes at the $LHC$ provide clean experimental conditions due to absence of the proton remnants, which might produce complementary and interesting results for tests of the standard model and for searching of new physics. In the context of the littlest $Higgs$ model with T-parity, we consider the photon-induced production of the mirror quarks at the $LHC$. The cross sections for various production channels are calculated and a simply phenomenology analysis is performed by assuming leptonic decays. |
2406.07958 | Gilberto Ramalho | G. Ramalho, K. Tsushima and Myung-Ki Cheoun | Weak interaction axial form factors of the octet baryons in nuclear
medium | 33 pages, 16 figures and 6 tables | null | null | LFTC-24-06/89 | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the axial-vector and the induced pseudoscalar form factors
associated with the weak transitions between the octet baryon members in
nuclear medium, using a covariant constituent quark model. We extend previous
calculations of the axial transition form factors from the vacuum (free space)
to the nuclear medium (symmetric nuclear matter). The extension of the model to
the nuclear medium takes into account the modifications of the properties of
hadrons in the medium (masses and coupling constants), as determined by the
quark-meson coupling model. The axial-vector ($G_A$) and the induced
pseudoscalar ($G_P$) form factors are evaluated for different values of the
nuclear density $\rho$ in terms of the square transfer momentum $q^2= -Q^2$. We
conclude that in general the $G_A$ and $G_P$ form factors are reduced in the
nuclear medium. The reduction is stronger for light baryons and high densities.
The medium modifications are milder for the heavier octet baryons, particularly
at large $Q^2$. The calculations presented here can be used to estimate the
cross sections of neutrino and antineutrino scattering with nucleus, and
neutrino and antineutrino scattering with hyperons bound to a nucleus, as well
as those in the cores of compact stars.
| [
{
"created": "Wed, 12 Jun 2024 07:35:44 GMT",
"version": "v1"
}
] | 2024-06-13 | [
[
"Ramalho",
"G.",
""
],
[
"Tsushima",
"K.",
""
],
[
"Cheoun",
"Myung-Ki",
""
]
] | We study the axial-vector and the induced pseudoscalar form factors associated with the weak transitions between the octet baryon members in nuclear medium, using a covariant constituent quark model. We extend previous calculations of the axial transition form factors from the vacuum (free space) to the nuclear medium (symmetric nuclear matter). The extension of the model to the nuclear medium takes into account the modifications of the properties of hadrons in the medium (masses and coupling constants), as determined by the quark-meson coupling model. The axial-vector ($G_A$) and the induced pseudoscalar ($G_P$) form factors are evaluated for different values of the nuclear density $\rho$ in terms of the square transfer momentum $q^2= -Q^2$. We conclude that in general the $G_A$ and $G_P$ form factors are reduced in the nuclear medium. The reduction is stronger for light baryons and high densities. The medium modifications are milder for the heavier octet baryons, particularly at large $Q^2$. The calculations presented here can be used to estimate the cross sections of neutrino and antineutrino scattering with nucleus, and neutrino and antineutrino scattering with hyperons bound to a nucleus, as well as those in the cores of compact stars. |
1703.05862 | Jun Song | Feng-lan Shao, Guo-jing Wang, Rui-qin Wang, Hai-hong Li, and Jun Song | Yield ratios of identified hadrons in p+p, p+Pb, Pb+Pb collisions at the
Large Hadron Collider | 8 pages, 2 figures | Phys. Rev. C 95, 064911 (2017) | 10.1103/PhysRevC.95.064911 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Yield ratios of identified hadrons observed in high multiplicity p+p and p+Pb
collisions at LHC show remarkable similarity with those in Pb+Pb collisions,
indicating some important and universal underlying dynamics in hadron
production for different quark gluon final states. We use the quark combination
model to explain the data of yield ratios in these three collision systems. The
observed $p/\pi$ and $\Lambda/K_s^0$ can be reproduced simultaneously by quark
combination, and these two ratios reflect the rate of baryon production at
hadronization which is the same in light sector and strange sector and is
roughly constant in p+p, p+Pb and Pb+Pb collision systems over three orders of
magnitude in charged particle multiplicity.The data of $K_s^0/\pi$,
$\Lambda/\pi$, $\Xi/\pi$ and $\Omega/\pi$ show a hierarchy behavior relating to
the strangeness content, and are naturally explained by quark combination both
in the saturate stage at high multiplicity and in the increase stage at
moderate multiplicity. Our results suggest that the dynamical characteristic of
quark combination is necessary in describing the production of hadrons in small
systems created in p+p and p+Pb collisions.
| [
{
"created": "Fri, 17 Mar 2017 01:14:12 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2017 07:52:29 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"Shao",
"Feng-lan",
""
],
[
"Wang",
"Guo-jing",
""
],
[
"Wang",
"Rui-qin",
""
],
[
"Li",
"Hai-hong",
""
],
[
"Song",
"Jun",
""
]
] | Yield ratios of identified hadrons observed in high multiplicity p+p and p+Pb collisions at LHC show remarkable similarity with those in Pb+Pb collisions, indicating some important and universal underlying dynamics in hadron production for different quark gluon final states. We use the quark combination model to explain the data of yield ratios in these three collision systems. The observed $p/\pi$ and $\Lambda/K_s^0$ can be reproduced simultaneously by quark combination, and these two ratios reflect the rate of baryon production at hadronization which is the same in light sector and strange sector and is roughly constant in p+p, p+Pb and Pb+Pb collision systems over three orders of magnitude in charged particle multiplicity.The data of $K_s^0/\pi$, $\Lambda/\pi$, $\Xi/\pi$ and $\Omega/\pi$ show a hierarchy behavior relating to the strangeness content, and are naturally explained by quark combination both in the saturate stage at high multiplicity and in the increase stage at moderate multiplicity. Our results suggest that the dynamical characteristic of quark combination is necessary in describing the production of hadrons in small systems created in p+p and p+Pb collisions. |
hep-ph/0009310 | Jan Kalinowski | J. Kalinowski | Search Strategies for non-Standard Higgses at e+e- Colliders | 4 pages, 2 figures. To appear in the proceedings of the XXXth ICHEP,
Osaka, Japan, July 27 -- August 2, 2000 | null | null | IFT/00-23 | hep-ph | null | The Higgs search strategies in minimal non-supersymmetric extensions of the
SM are discussed.
| [
{
"created": "Wed, 27 Sep 2000 11:06:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kalinowski",
"J.",
""
]
] | The Higgs search strategies in minimal non-supersymmetric extensions of the SM are discussed. |
hep-ph/0505208 | Yuri Goncharov | Yu.P. Goncharov | Structure of the confining solutions for SU(3)-Yang-Mills equations and
confinement mechanism | 16 pages, LaTeX | Phys.Lett. B617 (2005) 67-77 | 10.1016/j.physletb.2005.05.001 | null | hep-ph hep-th | null | Structure of exact solutions modelling confinement is discussed for
SU(3)-Yang-Mills equations and uniqueness of such confining solutions is proved
in a certain sense. Relationship of the obtained results to QCD and the
confinement mechanism is considered. Incidentally the Wilson confinement
criterion for the found solutions is verified and also numerical estimates for
strength of magnetic colour field responsible for linear confinement are
adduced in the ground state of charmonium.
| [
{
"created": "Tue, 24 May 2005 18:35:08 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Goncharov",
"Yu. P.",
""
]
] | Structure of exact solutions modelling confinement is discussed for SU(3)-Yang-Mills equations and uniqueness of such confining solutions is proved in a certain sense. Relationship of the obtained results to QCD and the confinement mechanism is considered. Incidentally the Wilson confinement criterion for the found solutions is verified and also numerical estimates for strength of magnetic colour field responsible for linear confinement are adduced in the ground state of charmonium. |
hep-ph/0406327 | Ted Barnes | T.Barnes (1 and 2) ((1) Physics Division, Oak Ridge National
Laboratory, (2) Department of Physics and Astronomy, University of Tennessee) | Charmonium at BES and CLEO-c | 15 pages, 2 figures. Expanded version of an invited presentation to
the CLEO-c and BESIII Joint Workshop on Charm, QCD and Tau Physics (Beijing,
13-15 Jan 2004). Uses besscleo.sty | null | null | null | hep-ph | null | This paper gives a short summary of some of the aspects of charmonium which
can be addressed at BES and CLEO-c and other $e^+e^-$ facilities. These topics
include the spectroscopy of charmonium states, radiative transitions, $e^+e^-$
widths, two-photon widths, hadron loop effects and open-flavor strong decays.
| [
{
"created": "Tue, 29 Jun 2004 18:35:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barnes",
"T.",
"",
"1 and 2"
]
] | This paper gives a short summary of some of the aspects of charmonium which can be addressed at BES and CLEO-c and other $e^+e^-$ facilities. These topics include the spectroscopy of charmonium states, radiative transitions, $e^+e^-$ widths, two-photon widths, hadron loop effects and open-flavor strong decays. |
2204.04433 | Gholamhossein Haghighat | Gholamhossein Haghighat, Mojtaba Mohammadi Najafabadi | Search for lepton-flavor-violating decays of the tau lepton at a future
muon collider | 7 pages, 2 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Tau leptons can have lepton-flavor-violating (LFV) couplings to a muon or an
electron and an Axion-Like Particle (ALP). ALPs are pseudo Nambu-Goldstone
bosons associated with spontaneously broken global U(1) symmetries. LFV ALPs
have been of a great interest in the last several decades as they can address
some of the SM long-lasting problems. Assuming a future muon collider proposed
by the Muon Accelerator Program (MAP), we search for LFV decays
$\tau\rightarrow\ell a$ ($\ell=e,\mu$) of one of the tau leptons produced in
the muon-anti muon annihilation. The ALP mass is assumed to be in the range 100
eV to 1 MeV and three different chiral structures are considered for the LFV
coupling. Using a multivariate technique and performing a parameterized
simulation based on the ideal target performance, we obtain expected 95$\%$
confidence level upper limits on the LFV couplings tau-electron-ALP and
tau-muon-ALP. Limits are computed assuming the center-of-mass energies of 126,
350 and 1500 GeV which the future muon collider is supposed to operate at. We
study the two cases of unpolarized and polarized muon beams and show that
taking advantage of tau polarization-induced effects, the main background
$\tau\rightarrow e/\mu + \nu\bar{\nu}$ can be significantly reduced. Results
indicate that current limits on the LFV couplings can be improved by roughly
one order of magnitude using the present analysis.
| [
{
"created": "Sat, 9 Apr 2022 09:18:07 GMT",
"version": "v1"
}
] | 2022-04-12 | [
[
"Haghighat",
"Gholamhossein",
""
],
[
"Najafabadi",
"Mojtaba Mohammadi",
""
]
] | Tau leptons can have lepton-flavor-violating (LFV) couplings to a muon or an electron and an Axion-Like Particle (ALP). ALPs are pseudo Nambu-Goldstone bosons associated with spontaneously broken global U(1) symmetries. LFV ALPs have been of a great interest in the last several decades as they can address some of the SM long-lasting problems. Assuming a future muon collider proposed by the Muon Accelerator Program (MAP), we search for LFV decays $\tau\rightarrow\ell a$ ($\ell=e,\mu$) of one of the tau leptons produced in the muon-anti muon annihilation. The ALP mass is assumed to be in the range 100 eV to 1 MeV and three different chiral structures are considered for the LFV coupling. Using a multivariate technique and performing a parameterized simulation based on the ideal target performance, we obtain expected 95$\%$ confidence level upper limits on the LFV couplings tau-electron-ALP and tau-muon-ALP. Limits are computed assuming the center-of-mass energies of 126, 350 and 1500 GeV which the future muon collider is supposed to operate at. We study the two cases of unpolarized and polarized muon beams and show that taking advantage of tau polarization-induced effects, the main background $\tau\rightarrow e/\mu + \nu\bar{\nu}$ can be significantly reduced. Results indicate that current limits on the LFV couplings can be improved by roughly one order of magnitude using the present analysis. |
0709.1368 | Emil Avsar | Emil Avsar, Gosta Gustafson and Leif Lonnblad | Diffractive Excitation in DIS and pp Collisions | correction of title | JHEP 0712:012,2007 | 10.1088/1126-6708/2007/12/012 | null | hep-ph | null | We have in earlier papers presented an extension of Mueller's dipole cascade
model, which includes subleading effects from energy conservation and running
coupling as well as colour suppressed effects from pomeron loops via a ``dipole
swing''. The model was applied to describe the total cross sections in pp and
gamma*p collisions. In this paper we present a number of improvements of the
model, in particular related to the confinement mechanism. A consistent
treatment of dipole evolution and dipole--dipole interactions is achieved by
replacing the infinite range Coulomb potential by a screened potential, which
further improves the frame-independence of the model. We then apply the model
to elastic scattering and diffractive excitation, where we specifically study
the effects of different sources for fluctuations. In our formalism we can take
into account contributions from all different sources, from the dipole cascade
evolution, the dipole--dipole scattering, from the impact-parameter dependence,
and from the initial photon and proton wavefunctions. Good agreement is
obtained with data from the Tevatron and from HERA, and we also present some
predictions for the LHC.
| [
{
"created": "Mon, 10 Sep 2007 12:19:45 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2007 13:40:46 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Nov 2007 15:48:55 GMT",
"version": "v3"
}
] | 2011-03-23 | [
[
"Avsar",
"Emil",
""
],
[
"Gustafson",
"Gosta",
""
],
[
"Lonnblad",
"Leif",
""
]
] | We have in earlier papers presented an extension of Mueller's dipole cascade model, which includes subleading effects from energy conservation and running coupling as well as colour suppressed effects from pomeron loops via a ``dipole swing''. The model was applied to describe the total cross sections in pp and gamma*p collisions. In this paper we present a number of improvements of the model, in particular related to the confinement mechanism. A consistent treatment of dipole evolution and dipole--dipole interactions is achieved by replacing the infinite range Coulomb potential by a screened potential, which further improves the frame-independence of the model. We then apply the model to elastic scattering and diffractive excitation, where we specifically study the effects of different sources for fluctuations. In our formalism we can take into account contributions from all different sources, from the dipole cascade evolution, the dipole--dipole scattering, from the impact-parameter dependence, and from the initial photon and proton wavefunctions. Good agreement is obtained with data from the Tevatron and from HERA, and we also present some predictions for the LHC. |
1801.05656 | Ye-Ling Zhou | TseChun Wang, Ye-Ling Zhou | Neutrino non-standard interactions as a portal to test flavour
symmetries | 41 pages, 6 figures, 13 tables, discussions and references added,
published in PRD | Phys. Rev. D 99, 035039 (2019) | 10.1103/PhysRevD.99.035039 | IPPP/18/4 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Imposing non-Abelian discrete flavour symmetries to neutrino non-standard
interactions (NSIs) is discussed for the first time. For definiteness, we
choose $A_4$ as the flavour symmetry, which is subsequently broken to the
residual symmetry $Z_2$ in the neutrino sector. We provide a general discussion
on flavour structures of NSIs from higher-dimensional operators ($d\leqslant8$)
without inducing unnecessary tree-level 4-charged-fermion interactions. Both
$A_4$- and $Z_2$-motivated NSI textures are obtained. UV completions of
higher-dimensional operators lead to extra experimental constraints on NSI
textures. We study the implementation of matter-effect NSIs in DUNE from
phenomenological point of view, and discover that DUNE can test $A_4$ with a
high level of statistics. We also present exclusion limits of sum rules
suggested by UV-complete models. Our result shows that the NSI effects, though
predicted to be small for DUNE, could provide useful information that might
extend our understanding of the flavour symmetry.
| [
{
"created": "Wed, 17 Jan 2018 13:35:44 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Aug 2018 08:22:44 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Mar 2019 19:03:21 GMT",
"version": "v3"
}
] | 2019-03-08 | [
[
"Wang",
"TseChun",
""
],
[
"Zhou",
"Ye-Ling",
""
]
] | Imposing non-Abelian discrete flavour symmetries to neutrino non-standard interactions (NSIs) is discussed for the first time. For definiteness, we choose $A_4$ as the flavour symmetry, which is subsequently broken to the residual symmetry $Z_2$ in the neutrino sector. We provide a general discussion on flavour structures of NSIs from higher-dimensional operators ($d\leqslant8$) without inducing unnecessary tree-level 4-charged-fermion interactions. Both $A_4$- and $Z_2$-motivated NSI textures are obtained. UV completions of higher-dimensional operators lead to extra experimental constraints on NSI textures. We study the implementation of matter-effect NSIs in DUNE from phenomenological point of view, and discover that DUNE can test $A_4$ with a high level of statistics. We also present exclusion limits of sum rules suggested by UV-complete models. Our result shows that the NSI effects, though predicted to be small for DUNE, could provide useful information that might extend our understanding of the flavour symmetry. |
1310.0348 | Carmen Garcia-Recio | C. Garcia-Recio, L. L. Salcedo, D. Gamermann, J. Nieves, O. Romanets,
and L. Tolos | Charming Baryons | 5 pages, 1 figure, 1 table. Invited talk at NSTAR 2013 | null | 10.1142/S2010194514601240 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study odd-parity baryonic resonances with one heavy and three light
flavors, dynamically generated by meson-baryon interactions. Special attention
is paid to Heavy Quark Spin Symmetry (HQSS), hence pseudoscalar and vector
mesons and baryons with J^P = 1/2+ and 3/2+ are considered as constituent
hadrons. For the hidden-charm sector (N-c-quarks = N-c-antiquarks = 1), the
meson-baryon Lagrangian with Heavy Flavor Symmetry is constructed by a minimal
extension of the SU(3) Weinberg-Tomozawa (WT) Lagrangian to fulfill HQSS, such
that not new parameters are needed. This interaction can be presented in
different formal ways: as a Field Lagrangian, as Hadron creation-annihilation
operators, as SU(6)xHQSS group projectors and as multichannel matrices. The
multichannel Bethe-Salpeter equation is solved for odd-parity light baryons,
hidden-charm N and Delta and Beauty Baryons (Lambda-b). Results of calculations
with this model are shown in comparison with other models and experimental
values for baryonic resonances.
| [
{
"created": "Tue, 1 Oct 2013 15:35:47 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Garcia-Recio",
"C.",
""
],
[
"Salcedo",
"L. L.",
""
],
[
"Gamermann",
"D.",
""
],
[
"Nieves",
"J.",
""
],
[
"Romanets",
"O.",
""
],
[
"Tolos",
"L.",
""
]
] | We study odd-parity baryonic resonances with one heavy and three light flavors, dynamically generated by meson-baryon interactions. Special attention is paid to Heavy Quark Spin Symmetry (HQSS), hence pseudoscalar and vector mesons and baryons with J^P = 1/2+ and 3/2+ are considered as constituent hadrons. For the hidden-charm sector (N-c-quarks = N-c-antiquarks = 1), the meson-baryon Lagrangian with Heavy Flavor Symmetry is constructed by a minimal extension of the SU(3) Weinberg-Tomozawa (WT) Lagrangian to fulfill HQSS, such that not new parameters are needed. This interaction can be presented in different formal ways: as a Field Lagrangian, as Hadron creation-annihilation operators, as SU(6)xHQSS group projectors and as multichannel matrices. The multichannel Bethe-Salpeter equation is solved for odd-parity light baryons, hidden-charm N and Delta and Beauty Baryons (Lambda-b). Results of calculations with this model are shown in comparison with other models and experimental values for baryonic resonances. |
1612.04737 | C\'edric Weiland | Asmaa Abada, Damir Becirevic, Olcyr Sumensari, Cedric Weiland and
Renata Zukanovich Funchal | Sterile neutrinos facing kaon physics experiments | 32 pages, 11 plots in 6 figures, version published in PRD | Phys. Rev. D 95, 075023 (2017) | 10.1103/PhysRevD.95.075023 | LPT-16-84, IPPP/16/119 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss weak kaon decays in a scenario in which the Standard Model is
extended by massive sterile fermions. After revisiting the analytical
expressions for leptonic and semileptonic decays we derive the expressions for
decay rates with two neutrinos in the final state. By using a simple effective
model with only one sterile neutrino, compatible with all current experimental
bounds and general theoretical constraints, we conduct a thorough numerical
analysis which reveals that the impact of the presence of massive sterile
neutrinos on kaon weak decays is very small, less than $1\%$ on decay rates.
The only exception is $\mathcal{B} (K_L\to \nu\nu)$, which can go up to
$\mathcal{O}( 10^{-10})$, thus possibly within the reach of the KOTO
experiment. In other words, if all the future measurements of weak kaon decays
turn out to be compatible with the Standard Model predictions, this would not
rule out the existence of massive light sterile neutrinos with non-negligible
active-sterile mixing. Instead, for a sterile neutrino of mass below $m_K$, one
might obtain a huge enhancement of $\mathcal{B} (K_L\to \nu\nu)$, otherwise
negligibly small in the Standard Model.
| [
{
"created": "Wed, 14 Dec 2016 17:21:33 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2017 11:35:03 GMT",
"version": "v2"
}
] | 2017-04-26 | [
[
"Abada",
"Asmaa",
""
],
[
"Becirevic",
"Damir",
""
],
[
"Sumensari",
"Olcyr",
""
],
[
"Weiland",
"Cedric",
""
],
[
"Funchal",
"Renata Zukanovich",
""
]
] | We discuss weak kaon decays in a scenario in which the Standard Model is extended by massive sterile fermions. After revisiting the analytical expressions for leptonic and semileptonic decays we derive the expressions for decay rates with two neutrinos in the final state. By using a simple effective model with only one sterile neutrino, compatible with all current experimental bounds and general theoretical constraints, we conduct a thorough numerical analysis which reveals that the impact of the presence of massive sterile neutrinos on kaon weak decays is very small, less than $1\%$ on decay rates. The only exception is $\mathcal{B} (K_L\to \nu\nu)$, which can go up to $\mathcal{O}( 10^{-10})$, thus possibly within the reach of the KOTO experiment. In other words, if all the future measurements of weak kaon decays turn out to be compatible with the Standard Model predictions, this would not rule out the existence of massive light sterile neutrinos with non-negligible active-sterile mixing. Instead, for a sterile neutrino of mass below $m_K$, one might obtain a huge enhancement of $\mathcal{B} (K_L\to \nu\nu)$, otherwise negligibly small in the Standard Model. |
hep-ph/9706428 | Mark Gibson | C.D. Froggatt, M. Gibson, H.B. Nielsen | A Natural Solution to the Neutrino Mixing Problem | 16 pages, LaTeX, uses FeynTeX package for figures | Phys.Lett. B409 (1997) 305-312 | 10.1016/S0370-2693(97)00934-9 | null | hep-ph | null | The combined requirements, of (i) a natural solution to the fermion mass
hierarchy problem and (ii) an explanation of both the atmospheric and solar
neutrino problems, lead to an essentially unique picture of neutrino masses and
mixing angles. The electron and muon neutrinos are quasi-degenerate in mass
with maximal mixing, giving $\nu_e - \nu_{\mu}$ vacuum oscillations. The
overall neutrino mass scale is set by the atmospheric neutrino requirement
$\Delta m^2 \sim 10^{-2}$ eV$^2$, implying a mass for $\nu_e$ and $\nu_{\mu}$
of order 1 eV in models with a natural mass hierarchy, whilst the tau neutrino
is expected to be much lighter than this and only weakly mixed. We present an
explicit example based on the anti-grand unification model of fermion masses.
| [
{
"created": "Fri, 20 Jun 1997 15:23:01 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Froggatt",
"C. D.",
""
],
[
"Gibson",
"M.",
""
],
[
"Nielsen",
"H. B.",
""
]
] | The combined requirements, of (i) a natural solution to the fermion mass hierarchy problem and (ii) an explanation of both the atmospheric and solar neutrino problems, lead to an essentially unique picture of neutrino masses and mixing angles. The electron and muon neutrinos are quasi-degenerate in mass with maximal mixing, giving $\nu_e - \nu_{\mu}$ vacuum oscillations. The overall neutrino mass scale is set by the atmospheric neutrino requirement $\Delta m^2 \sim 10^{-2}$ eV$^2$, implying a mass for $\nu_e$ and $\nu_{\mu}$ of order 1 eV in models with a natural mass hierarchy, whilst the tau neutrino is expected to be much lighter than this and only weakly mixed. We present an explicit example based on the anti-grand unification model of fermion masses. |
2312.09255 | Omar Medina | Mu-Chun Chen, Stephen F. King, Omar Medina, Jos\'e W. F. Valle | Quark-lepton mass relations from modular flavor symmetry | 23 pages, 5 figures. Comments welcome! v2: Minor comments added,
references added, matches published version. v3: Plots updated and improved,
Acknowledgments expanded | JHEP 02 (2024) 160 | 10.1007/JHEP02(2024)160 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The so-called Golden Mass Relation provides a testable correlation between
charged-lepton and down-type quark masses, that arises in certain flavor models
that do not rely on Grand Unification. Such models typically involve broken
family symmetries. In this work, we demonstrate that realistic fermion mass
relations can emerge naturally in modular invariant models, without relying on
ad hoc flavon alignments. We provide a model-independent derivation of a class
of mass relations that are experimentally testable. These relations are
determined by both the Clebsch-Gordan coefficients of the specific finite
modular group and the expansion coefficients of its modular forms, thus
offering potential probes of modular invariant models. As a detailed example,
we present a set of viable mass relations based on the $\Gamma_4\cong S_4$
symmetry, which have calculable deviations from the usual Golden Mass Relation.
| [
{
"created": "Thu, 14 Dec 2023 18:59:58 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Feb 2024 16:34:57 GMT",
"version": "v2"
},
{
"created": "Wed, 15 May 2024 17:08:35 GMT",
"version": "v3"
}
] | 2024-05-16 | [
[
"Chen",
"Mu-Chun",
""
],
[
"King",
"Stephen F.",
""
],
[
"Medina",
"Omar",
""
],
[
"Valle",
"José W. F.",
""
]
] | The so-called Golden Mass Relation provides a testable correlation between charged-lepton and down-type quark masses, that arises in certain flavor models that do not rely on Grand Unification. Such models typically involve broken family symmetries. In this work, we demonstrate that realistic fermion mass relations can emerge naturally in modular invariant models, without relying on ad hoc flavon alignments. We provide a model-independent derivation of a class of mass relations that are experimentally testable. These relations are determined by both the Clebsch-Gordan coefficients of the specific finite modular group and the expansion coefficients of its modular forms, thus offering potential probes of modular invariant models. As a detailed example, we present a set of viable mass relations based on the $\Gamma_4\cong S_4$ symmetry, which have calculable deviations from the usual Golden Mass Relation. |
hep-ph/0110283 | null | A. Kageyama, S. Kaneko, N. Shimoyama and M. Tanimoto | Lepton Flavor Violating Process in Degenerate and Inverse-Hierarchical
Neutrino Models | Latex file, 20 pages, 6 figures, revised version, discussion are
added, one figure and one equation also added | Phys.Lett. B527 (2002) 206-214 | 10.1016/S0370-2693(02)01180-2 | NIIG-DP-01-4 | hep-ph hep-ex | null | We have investigated the lepton flavor violation in the supersymmetric
framework assuming the large mixing angle MSW solution with the
quasi-degenerate and the inverse-hierarchical neutrino masses. In the case of
the quasi-degenerate neutrinos, the predicted branching ratio BR$(\mu \to e
\gamma)$ strongly depends on $m_\nu$ and $U_{e3}$. For $U_{e3}\simeq 0.05$ with
$m_\nu \simeq 0.3 \eV$, the prediction is close to the present experimental
upper bound if the right-handed Majorana neutrino masses are degenerate. On the
other hand, the prediction is larger than the experimental upper bound for
$U_{e3}\geq 0.05$ in the case of the inverse-hierarchical neutrino masses.
| [
{
"created": "Mon, 22 Oct 2001 14:26:23 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2001 08:25:10 GMT",
"version": "v2"
},
{
"created": "Sat, 1 Dec 2001 14:43:26 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Kageyama",
"A.",
""
],
[
"Kaneko",
"S.",
""
],
[
"Shimoyama",
"N.",
""
],
[
"Tanimoto",
"M.",
""
]
] | We have investigated the lepton flavor violation in the supersymmetric framework assuming the large mixing angle MSW solution with the quasi-degenerate and the inverse-hierarchical neutrino masses. In the case of the quasi-degenerate neutrinos, the predicted branching ratio BR$(\mu \to e \gamma)$ strongly depends on $m_\nu$ and $U_{e3}$. For $U_{e3}\simeq 0.05$ with $m_\nu \simeq 0.3 \eV$, the prediction is close to the present experimental upper bound if the right-handed Majorana neutrino masses are degenerate. On the other hand, the prediction is larger than the experimental upper bound for $U_{e3}\geq 0.05$ in the case of the inverse-hierarchical neutrino masses. |
hep-ph/0001163 | Venya Berezinsky | V. Berezinsky | Ultra High Energy Cosmic Rays from Cosmological Relics | Invited talk at TAUP-99, Paris, September 6 - 10, 1999. Several
references are added | Nucl.Phys.Proc.Suppl.87:387-396,2000 | 10.1016/S0920-5632(00)00701-5 | INFN/TH-2000/01 | hep-ph | null | The current status of origin of Ultra High Energy Cosmic Rays (UHECR) is
reviewed, with emphasis given to elementary particle solutions to UHECR
problem, namely to Topological Defects and Super-Heavy Dark Matter (SHDM)
particles. The relic superheavy particles are very efficiently produced at
inflation. Being protected by gauge discrete symmetries, they can be long
lived. They are clustering in the Galactic halo, producing thus UHECR without
Greisen-Zatsepin-Kuzmin cutoff. Topological Defects can naturally produce
particles with energies as observed and much higher, but in most cases fail to
produce the observed fluxes. Cosmic necklaces, monopoles connected by strings
and vortons are identified as most plausible sources. The latter two of them
are also clustering in the halo and their observational predictions are
identical to those of SHDM particles.
| [
{
"created": "Mon, 17 Jan 2000 14:46:58 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2000 15:55:08 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Berezinsky",
"V.",
""
]
] | The current status of origin of Ultra High Energy Cosmic Rays (UHECR) is reviewed, with emphasis given to elementary particle solutions to UHECR problem, namely to Topological Defects and Super-Heavy Dark Matter (SHDM) particles. The relic superheavy particles are very efficiently produced at inflation. Being protected by gauge discrete symmetries, they can be long lived. They are clustering in the Galactic halo, producing thus UHECR without Greisen-Zatsepin-Kuzmin cutoff. Topological Defects can naturally produce particles with energies as observed and much higher, but in most cases fail to produce the observed fluxes. Cosmic necklaces, monopoles connected by strings and vortons are identified as most plausible sources. The latter two of them are also clustering in the halo and their observational predictions are identical to those of SHDM particles. |
hep-ph/9808457 | Kimball A. Milton | K. A. Milton, I. L. Solovtsov, and O. P. Solovtsova | Analytic Perturbative Approach to QCD | 5 pages, 7 eps figures, parallel session talk at ICHEP'98, requires
ltwol.sty | null | null | OKHEP-98-06 | hep-ph | null | A technique called analytic perturbation theory, which respects the required
analytic properties, consistent with causality, is applied to the definition of
the running coupling in the timelike region, to the description of inclusive
$\tau$-decay, to deep-inelastic scattering sum rules, and to the investigation
of the renormalization scheme ambiguity. It is shown that in the region of a
few GeV the results are rather different from those obtained in the ordinary
perturbative description and are practically renormalization scheme
independent.
| [
{
"created": "Fri, 28 Aug 1998 16:00:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Milton",
"K. A.",
""
],
[
"Solovtsov",
"I. L.",
""
],
[
"Solovtsova",
"O. P.",
""
]
] | A technique called analytic perturbation theory, which respects the required analytic properties, consistent with causality, is applied to the definition of the running coupling in the timelike region, to the description of inclusive $\tau$-decay, to deep-inelastic scattering sum rules, and to the investigation of the renormalization scheme ambiguity. It is shown that in the region of a few GeV the results are rather different from those obtained in the ordinary perturbative description and are practically renormalization scheme independent. |
0710.0826 | Chong Sheng Li | Jun Gao, Chong Sheng Li, Zhao Li | Next-to-leading order QCD effects in associated charged Higgs and W
boson production in the MSSM at the CERN Large Hadron Collider | version to be published in Phys.Rev.D | Phys.Rev.D77:014032,2008 | 10.1103/PhysRevD.77.014032 | null | hep-ph | null | We present the calculations of the next-to-leading order (NLO) QCD
corrections to the inclusive total cross sections for the associated production
of the $W^{\pm}H^{\mp}$ through $b\bar{b}$ annihilation in the Minimal
Supersymmetric Standard Model at the CERN Large Hadron Collider. The NLO QCD
corrections can either enhance or reduce the total cross sections, but they
generally efficiently reduce the dependence of the total cross sections on the
renormalization/factorization scale. The magnitude of the NLO QCD corrections
is about 10% in most of the parameter space and can reach 15% in some parameter
regions. We also show the Monte Carlo simulation results for the
$2j+\tau_{jet}+\not{p}_{T}$ signature from the $W^{\pm}$ and the $H^{\mp}$
decays including the NLO QCD effects, and find an observable signal at a
$5\sigma$ level in some parameter region of the minimal supergravity model.
| [
{
"created": "Wed, 3 Oct 2007 16:13:52 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Oct 2007 16:28:21 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Nov 2007 11:39:14 GMT",
"version": "v3"
},
{
"created": "Fri, 9 Nov 2007 11:57:37 GMT",
"version": "v4"
},
{
"created": "Fri, 21 Dec 2007 05:31:01 GMT",
"version": "v5"
}
] | 2008-11-26 | [
[
"Gao",
"Jun",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Li",
"Zhao",
""
]
] | We present the calculations of the next-to-leading order (NLO) QCD corrections to the inclusive total cross sections for the associated production of the $W^{\pm}H^{\mp}$ through $b\bar{b}$ annihilation in the Minimal Supersymmetric Standard Model at the CERN Large Hadron Collider. The NLO QCD corrections can either enhance or reduce the total cross sections, but they generally efficiently reduce the dependence of the total cross sections on the renormalization/factorization scale. The magnitude of the NLO QCD corrections is about 10% in most of the parameter space and can reach 15% in some parameter regions. We also show the Monte Carlo simulation results for the $2j+\tau_{jet}+\not{p}_{T}$ signature from the $W^{\pm}$ and the $H^{\mp}$ decays including the NLO QCD effects, and find an observable signal at a $5\sigma$ level in some parameter region of the minimal supergravity model. |
0706.1042 | Stuart D. Wick | Triston Dougall, Stuart D. Wick | Dirac Magnetic Monopole Production from Photon Fusion in Proton
Collisions | 9 pages, 4 figures, minor correction, one reference added | Eur.Phys.J.A39:213-217,2009 | 10.1140/epja/i2008-10701-8 | null | hep-ph hep-ex | null | We calculate the lowest order cross--section for Dirac magnetic monopole
production from photon fusion in p p-bar collisions at sqrt{s}=1.96 TeV, p p
collisions at sqrt{s}=14 TeV, and we compare photon fusion with Drell--Yan (DY)
production. We find the total photon fusion cross--section is comparable with
DY at sqrt{s}=1.96 TeV and dominates DY by a factor ~50 at sqrt{s}=14 TeV. We
conclude that both the photon fusion and DY processes allow for a monopole mass
limit m>370 GeV based upon the null results of the recent monopole search at
the Collider Detector at Fermilab (CDF). We also conclude that photon fusion is
the leading production mechanism to be considered for direct monopole searches
at the Large Hadron Collider (LHC).
| [
{
"created": "Thu, 7 Jun 2007 17:17:23 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Feb 2008 17:57:40 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Dougall",
"Triston",
""
],
[
"Wick",
"Stuart D.",
""
]
] | We calculate the lowest order cross--section for Dirac magnetic monopole production from photon fusion in p p-bar collisions at sqrt{s}=1.96 TeV, p p collisions at sqrt{s}=14 TeV, and we compare photon fusion with Drell--Yan (DY) production. We find the total photon fusion cross--section is comparable with DY at sqrt{s}=1.96 TeV and dominates DY by a factor ~50 at sqrt{s}=14 TeV. We conclude that both the photon fusion and DY processes allow for a monopole mass limit m>370 GeV based upon the null results of the recent monopole search at the Collider Detector at Fermilab (CDF). We also conclude that photon fusion is the leading production mechanism to be considered for direct monopole searches at the Large Hadron Collider (LHC). |
1812.00144 | Satoshi Nakamura | S.X. Nakamura (Univ. Science and Technology of China, Univ. Cruzeiro
do Sul), H. Kamano (RCNP), T. Sato (RCNP, J-PARC) | Impact of final state interactions on neutrino-nucleon pion production
cross sections extracted from neutrino-deuteron reaction data | 7 pages, 4 figures, supplemental material included as appendix,
equations added, references added, published version | Phys. Rev. D 99, 031301 (2019) | 10.1103/PhysRevD.99.031301 | LFTC-18-15/36, J-PARC-TH-0139 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current and near-future neutrino oscillation experiments require
significantly improved neutrino-nucleus reaction models. Neutrino-nucleon pion
production data play a crucial role to validate corresponding elementary
amplitudes that go into such neutrino-nucleus models. Thus the currently
available data extracted from charged-current neutrino-deuteron reaction data
($\nu_\mu d\to \mu^-\pi NN$) must be corrected for nuclear effects such as the
Fermi motion and final state interactions (FSI). We study $\nu_\mu d\to
\mu^-\pi NN$ with a theoretical model including the impulse mechanism
supplemented by FSI from $NN$ and $\pi N$ rescatterings. An analysis of the
spectator momentum distributions reveals that the FSI effects significantly
reduce the spectra over the quasi-free peak region, and leads to a useful
recipe to extract information of elementary $\nu_\mu N\to \mu^-\pi N$ processes
using $\nu_\mu d\to \mu^-\pi NN$ data, with the important FSI corrections taken
into account. We provide $\nu_\mu N\to \mu^-\pi N$ total cross sections by
correcting the deuterium bubble chamber data for the FSI and Fermi motion. The
results will bring a significant improvement on neutrino-nucleus reaction
models for the near-future neutrino-oscillation experiments.
| [
{
"created": "Sat, 1 Dec 2018 04:47:05 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Feb 2019 00:06:26 GMT",
"version": "v2"
}
] | 2019-02-27 | [
[
"Nakamura",
"S. X.",
"",
"Univ. Science and Technology of China, Univ. Cruzeiro\n do Sul"
],
[
"Kamano",
"H.",
"",
"RCNP"
],
[
"Sato",
"T.",
"",
"RCNP, J-PARC"
]
] | The current and near-future neutrino oscillation experiments require significantly improved neutrino-nucleus reaction models. Neutrino-nucleon pion production data play a crucial role to validate corresponding elementary amplitudes that go into such neutrino-nucleus models. Thus the currently available data extracted from charged-current neutrino-deuteron reaction data ($\nu_\mu d\to \mu^-\pi NN$) must be corrected for nuclear effects such as the Fermi motion and final state interactions (FSI). We study $\nu_\mu d\to \mu^-\pi NN$ with a theoretical model including the impulse mechanism supplemented by FSI from $NN$ and $\pi N$ rescatterings. An analysis of the spectator momentum distributions reveals that the FSI effects significantly reduce the spectra over the quasi-free peak region, and leads to a useful recipe to extract information of elementary $\nu_\mu N\to \mu^-\pi N$ processes using $\nu_\mu d\to \mu^-\pi NN$ data, with the important FSI corrections taken into account. We provide $\nu_\mu N\to \mu^-\pi N$ total cross sections by correcting the deuterium bubble chamber data for the FSI and Fermi motion. The results will bring a significant improvement on neutrino-nucleus reaction models for the near-future neutrino-oscillation experiments. |
1006.4988 | Karol Kovarik | Karol Kovarik | PDFs for nuclear targets | 5 pages, to appear in Proceedings of DIS 2010 | PoS DIS2010:044,2010 | null | LPSC-10-081 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding nuclear effects in parton distribution functions (PDF) is an
essential component needed to determine the strange and anti-strange quark
contributions in the proton. In addition Nuclear Parton Distribution Functions
(NPDF) are critically important for any collider experiment with nuclei (e.g.
RHIC, ALICE). Here two next-to-leading order chi^2-analyses of NPDF are
presented. The first uses neutral current charged-lepton Deeply Inelastic
Scattering (DIS) and Drell-Yan data for several nuclear targets and the second
uses neutrino-nucleon DIS data. We compare the nuclear corrections factors
(F_2^Fe/F_2^D) for the charged-lepton data with other results from the
literature. In particular, we compare and contrast fits based upon the
charged-lepton DIS data with those using neutrino-nucleon DIS data.
| [
{
"created": "Fri, 25 Jun 2010 13:20:07 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Kovarik",
"Karol",
""
]
] | Understanding nuclear effects in parton distribution functions (PDF) is an essential component needed to determine the strange and anti-strange quark contributions in the proton. In addition Nuclear Parton Distribution Functions (NPDF) are critically important for any collider experiment with nuclei (e.g. RHIC, ALICE). Here two next-to-leading order chi^2-analyses of NPDF are presented. The first uses neutral current charged-lepton Deeply Inelastic Scattering (DIS) and Drell-Yan data for several nuclear targets and the second uses neutrino-nucleon DIS data. We compare the nuclear corrections factors (F_2^Fe/F_2^D) for the charged-lepton data with other results from the literature. In particular, we compare and contrast fits based upon the charged-lepton DIS data with those using neutrino-nucleon DIS data. |
hep-ph/9906366 | Takehiko Asaka | T. Asaka, K. Hamaguchi, M. Kawasaki and T. Yanagida | Leptogenesis in Inflaton Decay | 13 pages | Phys.Lett. B464 (1999) 12-18 | 10.1016/S0370-2693(99)01020-5 | null | hep-ph | null | We study a leptogenesis via decays of heavy Majorana neutrinos produced
non-thermally in inflaton decays. We find that this scenario is fully
consistent with existing supersymmetric inflation models such as for
topological or for hybrid inflation and the Froggatt-Nielsen mechanism
generating hierarchies in quark and lepton mass matrices. The reheating
temperature $T_R$ of inflation may be taken as low as $T_R \simeq 10^8$ GeV to
avoid the cosmological gravitino problem.
| [
{
"created": "Tue, 15 Jun 1999 08:29:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Asaka",
"T.",
""
],
[
"Hamaguchi",
"K.",
""
],
[
"Kawasaki",
"M.",
""
],
[
"Yanagida",
"T.",
""
]
] | We study a leptogenesis via decays of heavy Majorana neutrinos produced non-thermally in inflaton decays. We find that this scenario is fully consistent with existing supersymmetric inflation models such as for topological or for hybrid inflation and the Froggatt-Nielsen mechanism generating hierarchies in quark and lepton mass matrices. The reheating temperature $T_R$ of inflation may be taken as low as $T_R \simeq 10^8$ GeV to avoid the cosmological gravitino problem. |
hep-ph/0603213 | Shunzo Kumano | M. Hirai (KEK), S. Kumano (KEK, Graduate U. Adv. Studies), N. Saito
(Kyoto University) | Determination of polarized parton distribution functions with recent
data on polarization asymmetries | 11 pages, REVTeX, 13 eps files, Phys. Rev. D in press | Phys.Rev.D74:014015,2006 | 10.1103/PhysRevD.74.014015 | KEK-TH-1080 | hep-ph hep-ex nucl-ex nucl-th | null | Global analysis has been performed within the next-to-leading order in
Quantum Chromodynamics (QCD) to determine polarized parton distributions with
new experimental data in spin asymmetries. The new data set includes JLab,
HERMES, and COMPASS measurements on spin asymmetry A_1 for the neutron and
deuteron in lepton scattering. Our new analysis also utilizes the double-spin
asymmetry for pi^0 production in polarized pp collisions, A_{LL}^{pi^0},
measured by the PHENIX collaboration. Because of these new data, uncertainties
of the polarized PDFs are reduced. In particular, the JLab, HERMES, and COMPASS
measurements are valuable for determining Delta d_v(x) at large x and Delta
qbar(x) at x~0.1. The PHENIX pi^0 data significantly reduce the uncertainty of
Delta g(x). Furthermore, we discuss a possible constraint on Delta g(x) at
large x by using the HERMES data on g_1^d in comparison with the COMPASS ones
at x~0.05.
| [
{
"created": "Sat, 25 Mar 2006 13:31:39 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2006 07:09:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hirai",
"M.",
"",
"KEK"
],
[
"Kumano",
"S.",
"",
"KEK, Graduate U. Adv. Studies"
],
[
"Saito",
"N.",
"",
"Kyoto University"
]
] | Global analysis has been performed within the next-to-leading order in Quantum Chromodynamics (QCD) to determine polarized parton distributions with new experimental data in spin asymmetries. The new data set includes JLab, HERMES, and COMPASS measurements on spin asymmetry A_1 for the neutron and deuteron in lepton scattering. Our new analysis also utilizes the double-spin asymmetry for pi^0 production in polarized pp collisions, A_{LL}^{pi^0}, measured by the PHENIX collaboration. Because of these new data, uncertainties of the polarized PDFs are reduced. In particular, the JLab, HERMES, and COMPASS measurements are valuable for determining Delta d_v(x) at large x and Delta qbar(x) at x~0.1. The PHENIX pi^0 data significantly reduce the uncertainty of Delta g(x). Furthermore, we discuss a possible constraint on Delta g(x) at large x by using the HERMES data on g_1^d in comparison with the COMPASS ones at x~0.05. |
2112.14094 | Aparna Sankar | A.H. Ajjath, Pooja Mukherjee, V. Ravindran, Aparna Sankar and Surabhi
Tiwari | Next-to-soft-virtual resummed rapidity distribution for Drell-Yan
process to $\rm{\textbf{NNLO}+\overline{\textbf{NNLL}}}$ | 21 pages, 9 figures, 7 tables. We have corrected some typos in
equations 10,11, B3 and B6 and also added Eq 12 in this version | Phys.Rev.D 106 (2022) 3, 034005 | 10.1103/PhysRevD.106.034005 | IMSc/2021/12/09 , BONN-TH-2022-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the differential predictions for the rapidity distribution of a
pair of leptons through the Drell-Yan (DY) process at the LHC taking into
account the soft-virtual (SV) as well as next-to-soft virtual (NSV) resummation
effects in QCD perturbation theory to next-to-next-to-leading-order plus
next-to-next-to-leading-logarithmic ($\rm{{NNLO+\overline{NNLL}}}$) accuracy.
We perform the resummation in two dimensional Mellin space using our recent
formalism \cite{Ajjath:2020lwb} by limiting ourselves to contributions only
from quark anti-quark ($q \bar q$) initiated channels. The resummed corrections
to the fixed order results are computed through a matched formula using the
minimal prescription procedure. We find that the resummation at
next-to-leading-logarithmic (next-to-next-to-leading-logarithmic) level brings
about 3.98\% (1.24\%) corrections respectively to the NLO (NNLO) results at the
central scale value of $q=M_Z$ for 13 TeV LHC. We also observe that the
sensitivity to the renormalisation scale gets improved substantially by the
inclusion of NSV resummed predictions at $\rm \overline{NNLL}$ accuracy.
Further, the lack of quark gluon ($qg$) initiated contributions to NSV part in
the $\rm \overline{NNLL}$ resummed predictions leaves large factorisation scale
dependence indicating their importance at NSV level as we go to higher orders
in perturbation theory.
| [
{
"created": "Tue, 28 Dec 2021 11:24:36 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 2023 20:50:04 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Jun 2023 12:19:46 GMT",
"version": "v3"
}
] | 2023-06-07 | [
[
"Ajjath",
"A. H.",
""
],
[
"Mukherjee",
"Pooja",
""
],
[
"Ravindran",
"V.",
""
],
[
"Sankar",
"Aparna",
""
],
[
"Tiwari",
"Surabhi",
""
]
] | We present the differential predictions for the rapidity distribution of a pair of leptons through the Drell-Yan (DY) process at the LHC taking into account the soft-virtual (SV) as well as next-to-soft virtual (NSV) resummation effects in QCD perturbation theory to next-to-next-to-leading-order plus next-to-next-to-leading-logarithmic ($\rm{{NNLO+\overline{NNLL}}}$) accuracy. We perform the resummation in two dimensional Mellin space using our recent formalism \cite{Ajjath:2020lwb} by limiting ourselves to contributions only from quark anti-quark ($q \bar q$) initiated channels. The resummed corrections to the fixed order results are computed through a matched formula using the minimal prescription procedure. We find that the resummation at next-to-leading-logarithmic (next-to-next-to-leading-logarithmic) level brings about 3.98\% (1.24\%) corrections respectively to the NLO (NNLO) results at the central scale value of $q=M_Z$ for 13 TeV LHC. We also observe that the sensitivity to the renormalisation scale gets improved substantially by the inclusion of NSV resummed predictions at $\rm \overline{NNLL}$ accuracy. Further, the lack of quark gluon ($qg$) initiated contributions to NSV part in the $\rm \overline{NNLL}$ resummed predictions leaves large factorisation scale dependence indicating their importance at NSV level as we go to higher orders in perturbation theory. |
1001.5164 | Yury Bystritskiy | A.I. Ahmadov, Yu.M. Bystritskiy, E.A. Kuraev, A.N. Ilyichev | Charge-odd correlation of lepton and pion pair production in
electron-proton scattering | 10 pages, 4 figures | null | 10.1088/0954-3899/38/3/035005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Charge-odd correlation of the charged pair components produced at
electron-proton scattering can measure three current correlation averaged by
proton state. In general these type correlation can be described by 14
structure functions. We restrict here by consideration of inclusive
distributions of a pair components, which is the light-cone projection of the
relevant hadronic tensor. Besides we consider the point-like approximation for
proton and pion. Numerical estimations show that charge-odd effects can be
measured in exclusive ep -> 2 pi X experiments.
| [
{
"created": "Thu, 28 Jan 2010 12:24:07 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Ahmadov",
"A. I.",
""
],
[
"Bystritskiy",
"Yu. M.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Ilyichev",
"A. N.",
""
]
] | Charge-odd correlation of the charged pair components produced at electron-proton scattering can measure three current correlation averaged by proton state. In general these type correlation can be described by 14 structure functions. We restrict here by consideration of inclusive distributions of a pair components, which is the light-cone projection of the relevant hadronic tensor. Besides we consider the point-like approximation for proton and pion. Numerical estimations show that charge-odd effects can be measured in exclusive ep -> 2 pi X experiments. |
hep-ph/0007355 | Lorenz von Smekal | Reinhard Alkofer (1) and Lorenz von Smekal (2) ((1) Universitaet
Tuebingen, (2) Universitaet Erlangen-Nuernberg) | The Infrared Behavior of QCD Green's Functions - Confinement, Dynamical
Symmetry Breaking, and Hadrons as Relativistic Bound States | 212 Pages, LaTeX2e, submitted to Physics Reports; typos corrected,
improvements on grammar and style, references added | Phys.Rept.353:281,2001 | 10.1016/S0370-1573(01)00010-2 | UNITUE-THEP-00/09, FAU-TP3-00/8 | hep-ph hep-th nucl-th | null | Recent studies of QCD Green's functions and their applications in hadronic
physics are reviewed. We briefly discuss the issues of gauge fixing, BRS
invariance and positivity. Evidence for the violation of positivity by quarks
and transverse gluons in the covariant gauge is collected, and it is argued
that this is one manifestation of confinement.
We summarise the derivation of the Dyson-Schwinger equations (DSEs) of QED
and QCD. The influence of instantons on DSEs in a 2-dimensional model is
mentioned. Solutions for the Green's functions in QED in 2+1 and 3+1 dimensions
provide tests of various schemes to truncate DSEs. We discuss possible
extensions to QCD and their limitations. Truncation schemes for DSEs of QCD are
discussed in the axial gauge and in the Landau gauge. We review the available
results from a systematic non-perturbative expansion scheme established for
Landau gauge QCD. Comparisons to related lattice results, where available, are
presented.
The applications of QCD Green's functions to hadron physics are summarized.
Properties of ground state mesons are discussed on the basis of the
Bethe-Salpeter equation for quarks and antiquarks. The Goldstone nature of
pseudoscalar mesons and mechanisms of diquark confinement are reviewed. We
discuss some properties of ground state baryons based on their description as
Bethe-Salpeter/Faddeev bound states of quark-diquark correlations in the
quantum field theory of confined quarks and gluons.
| [
{
"created": "Mon, 31 Jul 2000 13:10:16 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Dec 2000 10:37:34 GMT",
"version": "v2"
}
] | 2010-02-18 | [
[
"Alkofer",
"Reinhard",
""
],
[
"von Smekal",
"Lorenz",
""
]
] | Recent studies of QCD Green's functions and their applications in hadronic physics are reviewed. We briefly discuss the issues of gauge fixing, BRS invariance and positivity. Evidence for the violation of positivity by quarks and transverse gluons in the covariant gauge is collected, and it is argued that this is one manifestation of confinement. We summarise the derivation of the Dyson-Schwinger equations (DSEs) of QED and QCD. The influence of instantons on DSEs in a 2-dimensional model is mentioned. Solutions for the Green's functions in QED in 2+1 and 3+1 dimensions provide tests of various schemes to truncate DSEs. We discuss possible extensions to QCD and their limitations. Truncation schemes for DSEs of QCD are discussed in the axial gauge and in the Landau gauge. We review the available results from a systematic non-perturbative expansion scheme established for Landau gauge QCD. Comparisons to related lattice results, where available, are presented. The applications of QCD Green's functions to hadron physics are summarized. Properties of ground state mesons are discussed on the basis of the Bethe-Salpeter equation for quarks and antiquarks. The Goldstone nature of pseudoscalar mesons and mechanisms of diquark confinement are reviewed. We discuss some properties of ground state baryons based on their description as Bethe-Salpeter/Faddeev bound states of quark-diquark correlations in the quantum field theory of confined quarks and gluons. |
2001.08676 | Ushak Rahaman | Suman Bharti, Ushak Rahaman, S. Uma Sankar | Matter vs. vacuum oscillations at long baseline accelerator neutrino
experiments | 12 pages, 4 figures | null | 10.1142/S021773232150098X | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutrino oscillation probabilities at the long-baseline accelerator
neutrino experiments are expected to be modified by matter effects. We search
for evidence of such modification in the data of T2K and NO$\nu$A, by fitting
the data to the hypothesis of (a) matter modified oscillations and (b) vacuum
oscillations. We find that vacuum oscillations provide as good a fit to the
data as matter modified oscillations. Even extended runs of T2K and NO$\nu$A,
with 5 years in neutrino mode $(5 \nu)$ and five years in anti-neutrino mode
$(5 \bar{\nu})$, can {\bf not} make a $3~\sigma$ distinction between vacuum and
matter modified oscillations. The proposed experiment DUNE, with neutrino and
anti-neutrino runs of 5 years each $(5 \nu + 5 \bar{\nu})$, can rule out vacuum
oscillations by itself at $5~\sigma$ if the hierarchy is normal. If the
hierarchy is inverted, a $5~\sigma$ discrimination against vacuum oscillations
requires the combination of $(5 \nu + 5 \bar{\nu})$ runs of T2K, \nova and
DUNE.
| [
{
"created": "Thu, 23 Jan 2020 17:17:53 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jan 2020 13:27:04 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Aug 2020 13:18:17 GMT",
"version": "v3"
},
{
"created": "Sun, 4 Oct 2020 15:58:57 GMT",
"version": "v4"
}
] | 2021-05-12 | [
[
"Bharti",
"Suman",
""
],
[
"Rahaman",
"Ushak",
""
],
[
"Sankar",
"S. Uma",
""
]
] | The neutrino oscillation probabilities at the long-baseline accelerator neutrino experiments are expected to be modified by matter effects. We search for evidence of such modification in the data of T2K and NO$\nu$A, by fitting the data to the hypothesis of (a) matter modified oscillations and (b) vacuum oscillations. We find that vacuum oscillations provide as good a fit to the data as matter modified oscillations. Even extended runs of T2K and NO$\nu$A, with 5 years in neutrino mode $(5 \nu)$ and five years in anti-neutrino mode $(5 \bar{\nu})$, can {\bf not} make a $3~\sigma$ distinction between vacuum and matter modified oscillations. The proposed experiment DUNE, with neutrino and anti-neutrino runs of 5 years each $(5 \nu + 5 \bar{\nu})$, can rule out vacuum oscillations by itself at $5~\sigma$ if the hierarchy is normal. If the hierarchy is inverted, a $5~\sigma$ discrimination against vacuum oscillations requires the combination of $(5 \nu + 5 \bar{\nu})$ runs of T2K, \nova and DUNE. |
hep-ph/0511336 | Morimitsu Tanimoto | M.Tanimoto and T.Yanagida | A Higher-dimensional Origin of the Inverted Mass Hierarchy for Neutrino | 15 pages | Phys.Lett. B633 (2006) 567-572 | 10.1016/j.physletb.2005.12.036 | null | hep-ph | null | We present successful lepton mass matrices with an inverted mass hierarchy
for neutrinos, which follow from a geometrical structure of a (1+5) dimensional
space-time where two extra dimensions are compactified on the T^2/Z_3 orbifold.
A 5^* and a right-handed neutrino N in each family are localized on each of the
equivalent three fixed points of the orbifold while three 10's and Higgs
doublets H_u and H_d live in the bulk. An S_3 family symmetry is assumed on
three 5^*'s and on three N's, since the three fixed points are equivalent to
one another. The Higgs field \phi responsible for the B-L breaking is localized
on one of the three fixed points, which generates the inverted hierarchy for
the neutrino masses. The baryon asymmetry is well explained in the non-thermal
leptogenesis via inflaton decay. We emphasize that the present model predicts
the effective neutrino mass, <m>_{ee}, responsible for neutrinoless double beta
decays as <m>_{ee}\simeq 50 meV. This will be accessible to future experiments.
| [
{
"created": "Wed, 30 Nov 2005 03:27:50 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Tanimoto",
"M.",
""
],
[
"Yanagida",
"T.",
""
]
] | We present successful lepton mass matrices with an inverted mass hierarchy for neutrinos, which follow from a geometrical structure of a (1+5) dimensional space-time where two extra dimensions are compactified on the T^2/Z_3 orbifold. A 5^* and a right-handed neutrino N in each family are localized on each of the equivalent three fixed points of the orbifold while three 10's and Higgs doublets H_u and H_d live in the bulk. An S_3 family symmetry is assumed on three 5^*'s and on three N's, since the three fixed points are equivalent to one another. The Higgs field \phi responsible for the B-L breaking is localized on one of the three fixed points, which generates the inverted hierarchy for the neutrino masses. The baryon asymmetry is well explained in the non-thermal leptogenesis via inflaton decay. We emphasize that the present model predicts the effective neutrino mass, <m>_{ee}, responsible for neutrinoless double beta decays as <m>_{ee}\simeq 50 meV. This will be accessible to future experiments. |
1205.5780 | Gennaro Corcella | Gennaro Corcella, Simonetta Gentile | Heavy Neutral Gauge Bosons at the LHC in an Extended MSSM | 53 pages, 23 figures, 25 tables. One Feynman diagram fixed, results
and conclusions unchanged | null | 10.1016/j.nuclphysb.2012.09.009 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Searching for heavy neutral gauge bosons Z', predicted in extensions of the
Standard Model based on a U(1)' gauge symmetry, is one of the challenging
objectives of the experiments carried out at the Large Hadron Collider. In this
paper, we study Z' phenomenology at hadron colliders according to several
U(1)'-based models and in the Sequential Standard Model. In particular,
possible Z' decays into supersymmetric particles are included, in addition to
the Standard Model modes so far investigated. We point out the impact of the
U(1)' group on the MSSM spectrum and, for a better understanding, we consider a
few benchmarks points in the parameter space. We account for the D-term
contribution, due to the breaking of U(1)', to slepton and squark masses and
investigate its effect on Z' decays into sfermions. Results on branching ratios
and cross sections are presented, as a function of the MSSM and U(1)'
parameters, which are varied within suitable ranges. We pay special attention
to final states with leptons and missing energy and make predictions on the
number of events with sparticle production in Z' decays, for a few values of
integrated luminosity and centre-of-mass energy of the LHC.
| [
{
"created": "Fri, 25 May 2012 19:13:05 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2012 12:34:06 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Oct 2012 12:59:37 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Nov 2012 14:25:40 GMT",
"version": "v4"
}
] | 2015-06-05 | [
[
"Corcella",
"Gennaro",
""
],
[
"Gentile",
"Simonetta",
""
]
] | Searching for heavy neutral gauge bosons Z', predicted in extensions of the Standard Model based on a U(1)' gauge symmetry, is one of the challenging objectives of the experiments carried out at the Large Hadron Collider. In this paper, we study Z' phenomenology at hadron colliders according to several U(1)'-based models and in the Sequential Standard Model. In particular, possible Z' decays into supersymmetric particles are included, in addition to the Standard Model modes so far investigated. We point out the impact of the U(1)' group on the MSSM spectrum and, for a better understanding, we consider a few benchmarks points in the parameter space. We account for the D-term contribution, due to the breaking of U(1)', to slepton and squark masses and investigate its effect on Z' decays into sfermions. Results on branching ratios and cross sections are presented, as a function of the MSSM and U(1)' parameters, which are varied within suitable ranges. We pay special attention to final states with leptons and missing energy and make predictions on the number of events with sparticle production in Z' decays, for a few values of integrated luminosity and centre-of-mass energy of the LHC. |
hep-ph/9707255 | Samal Manoj Kumar | M K Samal | CP Violation in EPR-like neutrino oscillations | 5 pages, latex, revtex style, no figures, more discussions are added
in the revised version | Mod.Phys.Lett. A13 (1998) 533-540 | 10.1142/S0217732398000590 | IP/BBSR/97-18 | hep-ph | null | After reviewing the general framework to study EPR-like neutrino
oscillations, we derive expressions for the oscillation probabilities and a
direct measure of CP violation. We compare the possibility of studying CP
violation in this case with that of baseline accelerator experiments and
conclude that it is possible to study CP violation in experiments with length
scales comparable to that of short baseline accelerator experiments.
| [
{
"created": "Sun, 6 Jul 1997 08:32:03 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Aug 1997 11:16:37 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Samal",
"M K",
""
]
] | After reviewing the general framework to study EPR-like neutrino oscillations, we derive expressions for the oscillation probabilities and a direct measure of CP violation. We compare the possibility of studying CP violation in this case with that of baseline accelerator experiments and conclude that it is possible to study CP violation in experiments with length scales comparable to that of short baseline accelerator experiments. |
2206.10782 | Nicholas Hunt-Smith | N.T. Hunt-Smith, A. Accardi, W. Melnitchouk, N. Sato, A.W. Thomas,
M.J. White | On the determination of uncertainties in parton densities | 32 pages, 9 figures | null | 10.1103/PhysRevD.106.036003 | JLAB-THY-22-3638, ADP-22-2/T1173 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review various methods used to estimate uncertainties in quantum
correlation functions, such as parton distribution functions (PDFs). Using a
toy model of a PDF, we compare the uncertainty estimates yielded by the
traditional Hessian and data resampling methods, as well as from explicitly
Bayesian analyses using nested sampling or hybrid Markov chain Monte Carlo
techniques. We investigate how uncertainty bands derived from neural network
approaches depend on details of the network training, and how they compare to
the uncertainties obtained from more traditional methods with a specific
underlying parametrization. Our results show that utilizing a neural network on
a simplified example of PDF data has the potential to inflate uncertainties, in
part due to the cross validation procedure that is generally used to avoid
overfitting data.
| [
{
"created": "Wed, 22 Jun 2022 00:25:02 GMT",
"version": "v1"
}
] | 2022-08-17 | [
[
"Hunt-Smith",
"N. T.",
""
],
[
"Accardi",
"A.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Sato",
"N.",
""
],
[
"Thomas",
"A. W.",
""
],
[
"White",
"M. J.",
""
]
] | We review various methods used to estimate uncertainties in quantum correlation functions, such as parton distribution functions (PDFs). Using a toy model of a PDF, we compare the uncertainty estimates yielded by the traditional Hessian and data resampling methods, as well as from explicitly Bayesian analyses using nested sampling or hybrid Markov chain Monte Carlo techniques. We investigate how uncertainty bands derived from neural network approaches depend on details of the network training, and how they compare to the uncertainties obtained from more traditional methods with a specific underlying parametrization. Our results show that utilizing a neural network on a simplified example of PDF data has the potential to inflate uncertainties, in part due to the cross validation procedure that is generally used to avoid overfitting data. |
2310.04654 | Yang Xiao | Huai-Ke Guo, Yang Xiao, Jin Min Yang and Yang Zhang | Estimating the Uncertainty of Cosmological First Order Phase Transitions
with Numerical Simulations | 12 pages, 13 figures | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to study the validity of analytical formulas used in the calculation
of characteristic physical quantities related to vacuum bubbles, we conduct
several numerical simulations of bubble kinematics in the context of
cosmological first-order phase transitions to determine potentially existing
systematic uncertainties. By comparing with the analytical results, we obtain
the following observations: (1) For the total number of bubbles, there is a 10%
discrepancy between the values from simulations and from analytical prediction;
(2) For the false vacuum fraction, the difference between the results from
simulations and from analytical prediction is small, which, however, plays a
crucial role in explaining the discrepancy observed in the total number of
bubbles; (3) The bubble lifetime distribution obtained from the simulations
deviates from the exponential distribution and is not obviously influenced by
different nucleation rates; (4) These differences propagate into the final
gravitational waves spectra, which we calculate with the sound shell model for
the usually dominant contribution from sound waves, and find that the bubble
number deviation enhances the peak value in the gravitational wave spectra,
while the deviation in the lifetime distribution suppresses the peak value.
| [
{
"created": "Sat, 7 Oct 2023 02:18:40 GMT",
"version": "v1"
}
] | 2023-10-10 | [
[
"Guo",
"Huai-Ke",
""
],
[
"Xiao",
"Yang",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Yang",
""
]
] | In order to study the validity of analytical formulas used in the calculation of characteristic physical quantities related to vacuum bubbles, we conduct several numerical simulations of bubble kinematics in the context of cosmological first-order phase transitions to determine potentially existing systematic uncertainties. By comparing with the analytical results, we obtain the following observations: (1) For the total number of bubbles, there is a 10% discrepancy between the values from simulations and from analytical prediction; (2) For the false vacuum fraction, the difference between the results from simulations and from analytical prediction is small, which, however, plays a crucial role in explaining the discrepancy observed in the total number of bubbles; (3) The bubble lifetime distribution obtained from the simulations deviates from the exponential distribution and is not obviously influenced by different nucleation rates; (4) These differences propagate into the final gravitational waves spectra, which we calculate with the sound shell model for the usually dominant contribution from sound waves, and find that the bubble number deviation enhances the peak value in the gravitational wave spectra, while the deviation in the lifetime distribution suppresses the peak value. |
1807.09805 | Yiannis Makris | Yiannis Makris, Varun Vaidya | Transverse Momentum Spectra at Threshold for Groomed Heavy Quark Jets | 26 pages, 7 figures | null | 10.1007/JHEP10(2018)019 | LA-UR-18-26754 | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We present the transverse momentum spectrum for a heavy hadron at threshold
in a groomed jet initiated by a heavy quark. The cross section is doubly
differential in the energy fraction of an identified heavy hadron in the jet
and its transverse momentum measured with respect to the groomed (recoil free)
jet axis. The grooming is implemented using a soft-drop grooming algorithm and
helps us in mitigating the effects of Non-Global logarithms and pile up. For
the particular case of a $B$ meson, we identify two distinct regimes of the
transverse momentum spectrum and develop an EFT within the formalisms of Soft
Collineat Effective Theory (SCET) and Heavy Quark Effective Theory (HQET) for
each of these regions. We show how each region can be matched smoothly into the
other to provide a prediction for the perturbative transverse momentum
spectrum. The EFT also predicts the scaling behavior of the leading
non-perturbative power corrections and implements a simple shape function to
account for hadronization. We work in the threshold region where the heavy
hadron carries most of the energy of the jet since in this regime, we have a
very good discriminating power between heavy quark and gluon initiated jets. We
observe that the shape of the spectrum is independent of the energy of the jet
over a large range of transverse momentum. We propose that this spectrum can be
used as a probe of evolution for heavy quark TMD fragmentation function. At the
same time, it can be treated as a jet substructure observable for probing
Quark-Gluon Plasma (QGP).
| [
{
"created": "Wed, 25 Jul 2018 18:11:11 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Oct 2018 18:00:36 GMT",
"version": "v2"
}
] | 2018-10-05 | [
[
"Makris",
"Yiannis",
""
],
[
"Vaidya",
"Varun",
""
]
] | We present the transverse momentum spectrum for a heavy hadron at threshold in a groomed jet initiated by a heavy quark. The cross section is doubly differential in the energy fraction of an identified heavy hadron in the jet and its transverse momentum measured with respect to the groomed (recoil free) jet axis. The grooming is implemented using a soft-drop grooming algorithm and helps us in mitigating the effects of Non-Global logarithms and pile up. For the particular case of a $B$ meson, we identify two distinct regimes of the transverse momentum spectrum and develop an EFT within the formalisms of Soft Collineat Effective Theory (SCET) and Heavy Quark Effective Theory (HQET) for each of these regions. We show how each region can be matched smoothly into the other to provide a prediction for the perturbative transverse momentum spectrum. The EFT also predicts the scaling behavior of the leading non-perturbative power corrections and implements a simple shape function to account for hadronization. We work in the threshold region where the heavy hadron carries most of the energy of the jet since in this regime, we have a very good discriminating power between heavy quark and gluon initiated jets. We observe that the shape of the spectrum is independent of the energy of the jet over a large range of transverse momentum. We propose that this spectrum can be used as a probe of evolution for heavy quark TMD fragmentation function. At the same time, it can be treated as a jet substructure observable for probing Quark-Gluon Plasma (QGP). |
hep-ph/0512179 | Sukanta Panda | Raj Gandhi and Sukanta Panda | Probing Very High Energy Prompt Muon and Neutrino fluxes and the cosmic
ray knee via Underground Muons | typos added, corrected, modified figures | JCAP 0607 (2006) 011 | 10.1088/1475-7516/2006/07/011 | null | hep-ph astro-ph hep-ex | null | We calculate event rate and demonstrate the observational feasibility of very
high energy muons (1-1000 TeV) in a large mass underground detector operating
as a pair-meter. This energy range corresponds to surface muon energies of
$\sim$(5 TeV - 5000 TeV) and primary cosmic ray energies of $\sim$ (50 TeV - 5
$\times 10^4$ TeV). Such measurements would significantly assist in an improved
understanding of the prompt contribution to $\nu_e, \nu_{\mu}$ and $\mu$ fluxes
in present and future ultra-high energy neutrino detectors. In addition, they
would shed light on the origin of the observed 'knee' in the cosmic ray
spectrum.
| [
{
"created": "Wed, 14 Dec 2005 12:14:47 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Dec 2005 18:56:07 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Aug 2006 14:07:33 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Gandhi",
"Raj",
""
],
[
"Panda",
"Sukanta",
""
]
] | We calculate event rate and demonstrate the observational feasibility of very high energy muons (1-1000 TeV) in a large mass underground detector operating as a pair-meter. This energy range corresponds to surface muon energies of $\sim$(5 TeV - 5000 TeV) and primary cosmic ray energies of $\sim$ (50 TeV - 5 $\times 10^4$ TeV). Such measurements would significantly assist in an improved understanding of the prompt contribution to $\nu_e, \nu_{\mu}$ and $\mu$ fluxes in present and future ultra-high energy neutrino detectors. In addition, they would shed light on the origin of the observed 'knee' in the cosmic ray spectrum. |
1810.05391 | Sukannya Bhattacharya | Roopam Sinha, Sukannya Bhattacharya, Rome Samanta | Phenomenological implications of the Friedberg-Lee transformation in a
neutrino mass model with $\mu\tau$-flavored CP symmetry | 20 pages, 7 figures, updated with clarifications and minor changes,
version published in JHEP | JHEP 1903 (2019) 081 | 10.1007/JHEP03(2019)081 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a neutrino mass model with $\mu\tau$-flavored CP symmetry, where
the effective light neutrino Lagrangian enjoys an additional invariance under a
Friedberg-Lee (FL) transformation on the left-handed flavor neutrino fields,
that leads to a highly predictive and testable scenario. While both types of
the light neutrino mass ordering, i.e., Normal Ordering (NO) as well as the
Inverted Ordering (IO) are allowed, the absolute scale of neutrino masses is
fixed by the vanishing determinant of light Majorana neutrino mass matrix
$M_\nu$. We show that for both types of mass ordering, whilst the atmospheric
mixing angle $\theta_{23}$ is in general nonmaximal ($\theta_{23}\neq \pi/4$),
the Dirac CP phase $\delta$ is exactly maximal ($\delta=\pi/2,3\pi/2$) for IO
and nearly maximal for NO owing to $\cos\delta\propto \sin\theta_{13}$. For the
NO, very tiny nonvanishing Majorana CP violation might appear through one of
the Majorana phases $\beta$; otherwise the model predicts vanishing Majorana CP
violation. Thus, despite the fact, that from the measurement of $\theta_{23}$,
it is difficult to rule out the model, any large deviation of $\delta$ from its
maximality, will surely falsify the scenario. For a comprehensive numerical
analysis, beside fitting the neutrino oscillation global fit data, we also
present a study on the $\nu_\mu\rightarrow \nu_e$ oscillation which is expected
to show up Dirac CP violation in different long baseline experiments. Finally,
assuming purely astrophysical sources, we calculate the Ultra High Energy (UHE)
neutrino flavor flux ratios at neutrino telescopes, such as IceCube, from which
statements on the octant of $\theta_{23}$ could be made in our model.
| [
{
"created": "Fri, 12 Oct 2018 07:55:25 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Apr 2019 09:52:33 GMT",
"version": "v2"
}
] | 2019-04-04 | [
[
"Sinha",
"Roopam",
""
],
[
"Bhattacharya",
"Sukannya",
""
],
[
"Samanta",
"Rome",
""
]
] | We propose a neutrino mass model with $\mu\tau$-flavored CP symmetry, where the effective light neutrino Lagrangian enjoys an additional invariance under a Friedberg-Lee (FL) transformation on the left-handed flavor neutrino fields, that leads to a highly predictive and testable scenario. While both types of the light neutrino mass ordering, i.e., Normal Ordering (NO) as well as the Inverted Ordering (IO) are allowed, the absolute scale of neutrino masses is fixed by the vanishing determinant of light Majorana neutrino mass matrix $M_\nu$. We show that for both types of mass ordering, whilst the atmospheric mixing angle $\theta_{23}$ is in general nonmaximal ($\theta_{23}\neq \pi/4$), the Dirac CP phase $\delta$ is exactly maximal ($\delta=\pi/2,3\pi/2$) for IO and nearly maximal for NO owing to $\cos\delta\propto \sin\theta_{13}$. For the NO, very tiny nonvanishing Majorana CP violation might appear through one of the Majorana phases $\beta$; otherwise the model predicts vanishing Majorana CP violation. Thus, despite the fact, that from the measurement of $\theta_{23}$, it is difficult to rule out the model, any large deviation of $\delta$ from its maximality, will surely falsify the scenario. For a comprehensive numerical analysis, beside fitting the neutrino oscillation global fit data, we also present a study on the $\nu_\mu\rightarrow \nu_e$ oscillation which is expected to show up Dirac CP violation in different long baseline experiments. Finally, assuming purely astrophysical sources, we calculate the Ultra High Energy (UHE) neutrino flavor flux ratios at neutrino telescopes, such as IceCube, from which statements on the octant of $\theta_{23}$ could be made in our model. |
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