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hep-ph/9511252 | null | Jean-Rene Cudell, Oscar F. Hernandez | Particle Production in a Hadron Collider Rapidity Gap: The Higgs Case | LaTeX file, 30 pages, 12 figures and psfig.sty included in a second
uufile. The full ready-to-print postscript manuscript is available by
anonymous ftp at ftp://lpsvsh.lps.umontreal.ca/ in theorie/hep-ph/Rapidity.ps
(it's a VAX so you'll have to use the format theorie.hep-ph if you change by
more than one directory at a time) | Nucl.Phys.B471:471-502,1996 | 10.1016/0550-3213(96)00193-9 | UdeM-TH-95, McGill/95-49, Brown-HET-1023 | hep-ph nucl-th | null | Production of rare particles within rapidity gaps has been proposed as a
background-free signal for the detection of new physics at hadron colliders. No
complete formalism accounts for such processes yet. We study a simple
lowest-order QCD model for their description. Concentrating on Higgs
production, we show that the calculation of the cross section pp -> pp H can be
embedded into existing models which successfully account for diffractive data.
We extend those models to take into account single and double diffractive cross
sections pp -> H X1 X2 with a gap between the fragments X1 and X2. Using
conservative scenarios, we evaluate the uncertainties in our calculation, and
study the dependence of the cross section on the gap width. We predict that
Higgs production within a gap of 4 units of rapidity is about 0.3 pb for a 100
GeV Higgs at the Tevatron, and almost 2 pb for a 400 GeV Higgs within a gap of
6 units at the LHC with 14 TeV beams.
| [
{
"created": "Tue, 7 Nov 1995 00:36:18 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Cudell",
"Jean-Rene",
""
],
[
"Hernandez",
"Oscar F.",
""
]
] | Production of rare particles within rapidity gaps has been proposed as a background-free signal for the detection of new physics at hadron colliders. No complete formalism accounts for such processes yet. We study a simple lowest-order QCD model for their description. Concentrating on Higgs production, we show that the calculation of the cross section pp -> pp H can be embedded into existing models which successfully account for diffractive data. We extend those models to take into account single and double diffractive cross sections pp -> H X1 X2 with a gap between the fragments X1 and X2. Using conservative scenarios, we evaluate the uncertainties in our calculation, and study the dependence of the cross section on the gap width. We predict that Higgs production within a gap of 4 units of rapidity is about 0.3 pb for a 100 GeV Higgs at the Tevatron, and almost 2 pb for a 400 GeV Higgs within a gap of 6 units at the LHC with 14 TeV beams. |
2407.12104 | Juan Esau Cervantes Hernandez | Esau Cervantes and Andrzej Hryczuk | Freezing-in Cannibal Dark Sectors | 47 pages, 18 figures | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self-Interacting Dark Matter models can successfully explain dark matter (DM)
production through interactions confined within the dark sector. However, they
often lack measurable experimental signals due to their secluded nature.
Including a feeble interaction with the visible sector through a Higgs portal
leads not only to potential detection avenues and richer thermal production
dynamics, but also to a possible explanation of the initial dark sector
population through the freeze-in mechanism. In this work we study, by solving
the full system of coupled Boltzmann equations for the number densities and
temperatures of all the involved states, three scenarios of this type where the
DM is: a real scalar with broken $\mathbb{Z}_2$, a complex scalar with unbroken
$\mathbb{Z}_3$, and a $\mathbb{Z}_3$ scalar with an additional scalar mediator.
All of these models have viable dark matter candidates in a cannibal phase
while having different detection profiles. We show that cosmological bounds can
be either exacerbated or evaded by changing the dark sector interactions,
leading to potential signatures in long-lived particle and indirect detection
experiments.
| [
{
"created": "Tue, 16 Jul 2024 18:14:21 GMT",
"version": "v1"
}
] | 2024-07-18 | [
[
"Cervantes",
"Esau",
""
],
[
"Hryczuk",
"Andrzej",
""
]
] | Self-Interacting Dark Matter models can successfully explain dark matter (DM) production through interactions confined within the dark sector. However, they often lack measurable experimental signals due to their secluded nature. Including a feeble interaction with the visible sector through a Higgs portal leads not only to potential detection avenues and richer thermal production dynamics, but also to a possible explanation of the initial dark sector population through the freeze-in mechanism. In this work we study, by solving the full system of coupled Boltzmann equations for the number densities and temperatures of all the involved states, three scenarios of this type where the DM is: a real scalar with broken $\mathbb{Z}_2$, a complex scalar with unbroken $\mathbb{Z}_3$, and a $\mathbb{Z}_3$ scalar with an additional scalar mediator. All of these models have viable dark matter candidates in a cannibal phase while having different detection profiles. We show that cosmological bounds can be either exacerbated or evaded by changing the dark sector interactions, leading to potential signatures in long-lived particle and indirect detection experiments. |
hep-ph/0601097 | Piotr Chankowski | P.H. Chankowski, S. Pokorski, J. Wagner | Z' and the Appelquist-Carrazzone decoupling | 36 pages, no postscript figures | Eur.Phys.J.C47:187-205,2006 | 10.1140/epjc/s2006-02537-3 | IFT-01/2006 | hep-ph | null | We consider the electroweak theory with an additional neutral vector boson
$Z^\prime$ at one loop. We propose a renormalization scheme which makes the
decoupling of heavy $Z^\prime$ effects manifest. The proposed scheme justifies
the usual procedure of performing fits to the electroweak data by combining the
full SM loop corrections to observables with the tree level corrections due to
the extended gauge structure. Using this scheme we discuss in the model with
extra an $U(1)^\prime$ group factor 1-loop results for the $\rho$ parameters
defined in several different ways.
| [
{
"created": "Thu, 12 Jan 2006 13:22:44 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Chankowski",
"P. H.",
""
],
[
"Pokorski",
"S.",
""
],
[
"Wagner",
"J.",
""
]
] | We consider the electroweak theory with an additional neutral vector boson $Z^\prime$ at one loop. We propose a renormalization scheme which makes the decoupling of heavy $Z^\prime$ effects manifest. The proposed scheme justifies the usual procedure of performing fits to the electroweak data by combining the full SM loop corrections to observables with the tree level corrections due to the extended gauge structure. Using this scheme we discuss in the model with extra an $U(1)^\prime$ group factor 1-loop results for the $\rho$ parameters defined in several different ways. |
hep-ph/0308294 | Bernard Metsch | Bernard Metsch | Structure of baryons in a relativistic quark model | 7 pages, 2 figures, Contribution to the Proceedings of the 17th
International IUPAP Conference on Few-Body Problems in Physics, Durham, North
Carolina, USA, 5-10 June 2003 | Nucl.Phys. A737 (2004) 172-176 | 10.1016/j.nuclphysa.2004.03.059 | HISKP-TH-03/17 | hep-ph | null | Baryonic excitation spectra, electroweak and strong decay properties are
discussed within a relativistically covariant constituent quark model based on
the instantaneous approximation to the three-body Bethe-Salpeter equation.
| [
{
"created": "Thu, 28 Aug 2003 10:07:21 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Metsch",
"Bernard",
""
]
] | Baryonic excitation spectra, electroweak and strong decay properties are discussed within a relativistically covariant constituent quark model based on the instantaneous approximation to the three-body Bethe-Salpeter equation. |
hep-ph/9905205 | Zbigniew Was | S. Jadach, B.F.L. Ward and Z. Was | The Monte Carlo Program KORALZ, for the Lepton or Quark Pair Production
at LEP/SLC Energies -- From version 4.0 to version 4.04 | 1+6 pages | Comput.Phys.Commun. 124 (2000) 233-237 | 10.1016/S0010-4655(99)00437-3 | CERN-TH/99-119 | hep-ph | null | Brief information on new features of KORALZ version 4.04 with respect to
version 4.0 is given. The main difference is that the new version could be used
at LEP2 energies, i.e. up to 240 GeV centre-of-mass system energy. The
possibility to switch on different classes of anomalous couplings is also
included.
| [
{
"created": "Mon, 3 May 1999 13:31:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Jadach",
"S.",
""
],
[
"Ward",
"B. F. L.",
""
],
[
"Was",
"Z.",
""
]
] | Brief information on new features of KORALZ version 4.04 with respect to version 4.0 is given. The main difference is that the new version could be used at LEP2 energies, i.e. up to 240 GeV centre-of-mass system energy. The possibility to switch on different classes of anomalous couplings is also included. |
hep-ph/9903208 | Milton | Milton Dean Slaughter | The $N-\Delta$ Weak Axial-Vector Amplitude $C_{5}^a(0)$ | 9 pages, RevTex 3.1 | Nucl.Phys.A703:295-305,2002 | 10.1016/S0375-9474(01)01333-1 | Preprint: UNO-HEP-98-05 | hep-ph | null | The weak $N-\Delta$ axial-vector transition amplitude $<\Delta| A_{\pi
^{+}}^\mu |N>$ - important in $N^{*}$ production processes in general and in
isobar models describing $\nu_\mu N\to \mu \Delta$ processes in particular - is
examined using a broken symmetry algebraic approach to QCD which involves the
realization of chiral current algebras. We calculate a value for the form
factor $C_{5}^{A}(0)$ in good agreement with experiment.
| [
{
"created": "Mon, 1 Mar 1999 03:04:43 GMT",
"version": "v1"
}
] | 2009-10-19 | [
[
"Slaughter",
"Milton Dean",
""
]
] | The weak $N-\Delta$ axial-vector transition amplitude $<\Delta| A_{\pi ^{+}}^\mu |N>$ - important in $N^{*}$ production processes in general and in isobar models describing $\nu_\mu N\to \mu \Delta$ processes in particular - is examined using a broken symmetry algebraic approach to QCD which involves the realization of chiral current algebras. We calculate a value for the form factor $C_{5}^{A}(0)$ in good agreement with experiment. |
hep-ph/0212028 | Kaustubh Agashe | Kaustubh Agashe, Antonio Delgado and Raman Sundrum (Johns Hopkins
University) | Grand Unification in RS1 | Latex, 23 pages. In the revised version, Eq. (3.3) has been modified
with no change in the central result of the paper and a reference has been
added | Ann.Phys.304:145-164,2003 | 10.1016/S0003-4916(03)00013-7 | null | hep-ph hep-th | null | We study unification in the Randall-Sundrum scenario for solving the
hierarchy problem, with gauge fields and fermions in the bulk. We calculate the
one-loop corrected low-energy effective gauge couplings in a unified theory,
broken at the scale M_GUT in the bulk. We find that, although this scenario has
an extra dimension, there is a robust (calculable in the effective field
theory) logarithmic dependence on M_GUT, strongly suggestive of high-scale
unification, very much as in the (4D) Standard Model. Moreover, bulk threshold
effects are naturally small, but volume-enhanced, so that we can accommodate
the measured gauge couplings. We show in detail how excessive proton decay is
forbidden by an extra U(1) bulk gauge symmetry. This mechanism requires us to
further break the unified group using boundary conditions. A 4D dual
interpretation, in the sense of the AdS/CFT correspondence, is provided for all
our results. Our results show that an attractive unification mechanism can
combine with a non-supersymmetric solution to the hierarchy problem.
| [
{
"created": "Tue, 3 Dec 2002 20:29:46 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Dec 2002 23:53:30 GMT",
"version": "v2"
}
] | 2009-09-15 | [
[
"Agashe",
"Kaustubh",
"",
"Johns Hopkins\n University"
],
[
"Delgado",
"Antonio",
"",
"Johns Hopkins\n University"
],
[
"Sundrum",
"Raman",
"",
"Johns Hopkins\n University"
]
] | We study unification in the Randall-Sundrum scenario for solving the hierarchy problem, with gauge fields and fermions in the bulk. We calculate the one-loop corrected low-energy effective gauge couplings in a unified theory, broken at the scale M_GUT in the bulk. We find that, although this scenario has an extra dimension, there is a robust (calculable in the effective field theory) logarithmic dependence on M_GUT, strongly suggestive of high-scale unification, very much as in the (4D) Standard Model. Moreover, bulk threshold effects are naturally small, but volume-enhanced, so that we can accommodate the measured gauge couplings. We show in detail how excessive proton decay is forbidden by an extra U(1) bulk gauge symmetry. This mechanism requires us to further break the unified group using boundary conditions. A 4D dual interpretation, in the sense of the AdS/CFT correspondence, is provided for all our results. Our results show that an attractive unification mechanism can combine with a non-supersymmetric solution to the hierarchy problem. |
1904.01642 | Ren\'e Sedmik | Galina L. Klimchitskaya, Vladimir M. Mostepanenko, Ren\'e I. P.
Sedmik, and Hartmut Abele | Prospects for Searching Thermal Effects, Non-Newtonian Gravity and
Axion-Like Particles: Cannex Test of the Quantum Vacuum | null | Symmetry 11(3) (2019) 407 | 10.3390/sym11030407 | null | hep-ph astro-ph.CO hep-th quant-ph | http://creativecommons.org/licenses/by-sa/4.0/ | We consider the CANNEX (Casimir And Non-Newtonian force EXperiment) test of
the quantum vacuum intended for measuring the gradient of the Casimir pressure
between two flat parallel plates at large separations and constraining
parameters of the chameleon model of dark energy in cosmology. A modification
of the measurement scheme is proposed that allows simultaneous measurements of
both the Casimir pressure and its gradient in one experiment. It is shown that
with several improvements the CANNEX test will be capable to strengthen the
constraints on the parameters of the Yukawa-type interaction by up to an order
of magnitude over a wide interaction range. The constraints on the coupling
constants between nucleons and axion-like particles, which are considered as
the most probable constituents of dark matter, could also be strengthened over
a region of axion masses from 1 to 100 meV.
| [
{
"created": "Sat, 23 Mar 2019 12:43:42 GMT",
"version": "v1"
}
] | 2019-04-04 | [
[
"Klimchitskaya",
"Galina L.",
""
],
[
"Mostepanenko",
"Vladimir M.",
""
],
[
"Sedmik",
"René I. P.",
""
],
[
"Abele",
"Hartmut",
""
]
] | We consider the CANNEX (Casimir And Non-Newtonian force EXperiment) test of the quantum vacuum intended for measuring the gradient of the Casimir pressure between two flat parallel plates at large separations and constraining parameters of the chameleon model of dark energy in cosmology. A modification of the measurement scheme is proposed that allows simultaneous measurements of both the Casimir pressure and its gradient in one experiment. It is shown that with several improvements the CANNEX test will be capable to strengthen the constraints on the parameters of the Yukawa-type interaction by up to an order of magnitude over a wide interaction range. The constraints on the coupling constants between nucleons and axion-like particles, which are considered as the most probable constituents of dark matter, could also be strengthened over a region of axion masses from 1 to 100 meV. |
2304.05225 | Arthur Vereijken | Arthur Vereijken, Shahriyar Jafarzade, Milena Piotrowska, Francesco
Giacosa | Is $f_2(1950)$ the tensor glueball? | v3 fixed email and table | null | 10.1103/PhysRevD.108.014023 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Glueballs remain an experimentally undiscovered expectation of QCD. Lattice
QCD (As well as other theoretical approaches) predicts a spectrum of glueballs,
with the tensor ($J^{PC}=2^{++}$) glueball being the second lightest, behind
the scalar glueball. Here, using a chiral hadronic model, we compute decay
ratios of the tensor glueball into various meson decay channels. We find the
tensor glueball to primarily decay into two vector mesons, dominated by $\rho
\rho $ and $K^*K^*$ channels. These results are compared to experimental data
of decay rates of isoscalar tensor mesons. Based on this comparison, we make
statements on the eligibility of these mesons as potential tensor glueball
candidates: the resonance $f_2(1950)$ turns out to be, at present, the best
match as being predominantly a tensor glueball.
| [
{
"created": "Tue, 11 Apr 2023 13:51:56 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2023 10:59:37 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Apr 2023 12:54:23 GMT",
"version": "v3"
}
] | 2023-08-02 | [
[
"Vereijken",
"Arthur",
""
],
[
"Jafarzade",
"Shahriyar",
""
],
[
"Piotrowska",
"Milena",
""
],
[
"Giacosa",
"Francesco",
""
]
] | Glueballs remain an experimentally undiscovered expectation of QCD. Lattice QCD (As well as other theoretical approaches) predicts a spectrum of glueballs, with the tensor ($J^{PC}=2^{++}$) glueball being the second lightest, behind the scalar glueball. Here, using a chiral hadronic model, we compute decay ratios of the tensor glueball into various meson decay channels. We find the tensor glueball to primarily decay into two vector mesons, dominated by $\rho \rho $ and $K^*K^*$ channels. These results are compared to experimental data of decay rates of isoscalar tensor mesons. Based on this comparison, we make statements on the eligibility of these mesons as potential tensor glueball candidates: the resonance $f_2(1950)$ turns out to be, at present, the best match as being predominantly a tensor glueball. |
2208.08139 | Giulio Gambuti | Amlan Chakraborty and Giulio Gambuti | Three-Loop Four-Point Scattering Amplitudes in Massless Gauge Theories | 11 pages, 2 figures. Talk presented at the conference "Loops and Legs
in Quantum Field Theory", 25-30 April, 2022, Ettal, Germany | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present novel techniques for the computation of three-loop four-parton
scattering amplitudes in full color, non-planar gauge theories. We elaborate on
how the analytic results for these amplitudes can be used to confirm the
conjectured infrared structure of QCD up to three loops and how all-orders data
can be extracted from their high-energy limit.
| [
{
"created": "Wed, 17 Aug 2022 08:15:23 GMT",
"version": "v1"
}
] | 2022-08-18 | [
[
"Chakraborty",
"Amlan",
""
],
[
"Gambuti",
"Giulio",
""
]
] | We present novel techniques for the computation of three-loop four-parton scattering amplitudes in full color, non-planar gauge theories. We elaborate on how the analytic results for these amplitudes can be used to confirm the conjectured infrared structure of QCD up to three loops and how all-orders data can be extracted from their high-energy limit. |
1611.10139 | Falk Wunderlich | Falk Wunderlich, Burkhard Kampfer | Photon emissivity in the vicinity of a critical point - A case study
within the quark meson model | 22 pages, 11 figures | null | 10.1016/j.nuclphysa.2016.11.009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quark meson (linear sigma) model with linearized fluctuations displays at
a critical end point the onset of a curve of first-order phase transitions
(FOPTs) located at non-zero chemical potentials and temperatures below a
certain cross-over temperature. The model qualifies well for an illustrative
example to study the impact of the emerging FOPT, e.g. on photon emissivities.
Such a case study unravels the tight interlocking of the phase structure with
the emission rates, here calculated according to lowest-order tree level
processes by kinetic theory expressions. It is the strong dependence of the
rates on the effective masses of the involved degrees of freedom which
distinctively vary over the phase diagram thus shaping the emissivity
accordingly. At the same time, thermodynamic properties of the medium are
linked decisively to these effective masses, i.e. a consistent evaluation of
thermodynamics, governing for instance adiabatic expansion paths, and emission
rates is maintained within such an approach.
| [
{
"created": "Wed, 30 Nov 2016 13:30:59 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Wunderlich",
"Falk",
""
],
[
"Kampfer",
"Burkhard",
""
]
] | The quark meson (linear sigma) model with linearized fluctuations displays at a critical end point the onset of a curve of first-order phase transitions (FOPTs) located at non-zero chemical potentials and temperatures below a certain cross-over temperature. The model qualifies well for an illustrative example to study the impact of the emerging FOPT, e.g. on photon emissivities. Such a case study unravels the tight interlocking of the phase structure with the emission rates, here calculated according to lowest-order tree level processes by kinetic theory expressions. It is the strong dependence of the rates on the effective masses of the involved degrees of freedom which distinctively vary over the phase diagram thus shaping the emissivity accordingly. At the same time, thermodynamic properties of the medium are linked decisively to these effective masses, i.e. a consistent evaluation of thermodynamics, governing for instance adiabatic expansion paths, and emission rates is maintained within such an approach. |
hep-ph/9304264 | Bob Holdom | B. Holdom, Randy Lewis and Roberto R. Mendel | Hadronic contribution to the photon vacuum polarization: a theoretical
estimate | 12 pages of LaTeX plus 3 uuencoded postscript figures, UTPT-93-7 | Z. Phys. C63 (1994) 71-76 | 10.1007/BF01577545 | null | hep-ph | null | A simple model for the hadronic contribution to the photon vacuum
polarization function $\Pi_{had}(q^2)$, for spacelike momenta, is presented.
For small momenta, the two loop contribution from the pseudoscalar meson octet
is computed from the chiral Lagrangian. The light quark contribution (which at
low momentum gives the ${\cal O}(q^6)$ counterterm in the chiral Lagrangian) is
calculated within a relativistic constituent quark model incorporating the
momentum dependence of the quark mass. The perturbative gluons of QCD are
included in a standard fashion. The total result is close to an estimate of
$\Pi_{had}(q^2)$ that is obtained directly from $e^+e^-\to hadrons$ data. We
further use our results for $\Pi_{had}(q^2)$ to calculate the ${\cal O}(e^4)$
hadronic contribution to lepton magnetic moments and to calculate
$\alpha_{QED}(M_Z^2)$. A simpler model of constituent quarks with momentum
independent masses gives less favourable results.
| [
{
"created": "Fri, 16 Apr 1993 20:43:20 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Feb 1994 20:44:19 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Holdom",
"B.",
""
],
[
"Lewis",
"Randy",
""
],
[
"Mendel",
"Roberto R.",
""
]
] | A simple model for the hadronic contribution to the photon vacuum polarization function $\Pi_{had}(q^2)$, for spacelike momenta, is presented. For small momenta, the two loop contribution from the pseudoscalar meson octet is computed from the chiral Lagrangian. The light quark contribution (which at low momentum gives the ${\cal O}(q^6)$ counterterm in the chiral Lagrangian) is calculated within a relativistic constituent quark model incorporating the momentum dependence of the quark mass. The perturbative gluons of QCD are included in a standard fashion. The total result is close to an estimate of $\Pi_{had}(q^2)$ that is obtained directly from $e^+e^-\to hadrons$ data. We further use our results for $\Pi_{had}(q^2)$ to calculate the ${\cal O}(e^4)$ hadronic contribution to lepton magnetic moments and to calculate $\alpha_{QED}(M_Z^2)$. A simpler model of constituent quarks with momentum independent masses gives less favourable results. |
1906.02714 | Zurab Berezhiani | Benedetta Belfatto, Revaz Beradze, Zurab Berezhiani | The CKM unitarity problem: A trace of new physics at the TeV scale? | 11 pages, 10 figures | null | 10.1140/epjc/s10052-020-7691-6 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the recent high precision determinations of $V_{us}$ and $V_{ud}$, the
first row of the CKM matrix shows more than $4\sigma$ deviation from unitarity.
Two possible scenarios beyond the Standard Model can be investigated in order
to fill the gap. If a 4th quark $b'$ participates in the mixing, with $\vert
V_{ub'} \vert \sim0.04$, then its mass should be no more than 6 TeV or so. A
different solution can come from the introduction of the gauge horizontal
family symmetry acting between the lepton families and spontaneously broken at
the scale of about 6 TeV. Since the gauge bosons of this symmetry contribute to
muon decay in positive interference with Standard Model, the Fermi constant is
slightly smaller than the muon decay constant so that unitarity is recovered.
Also the neutron lifetime problem, that is about $4\sigma$ discrepancy between
the neutron lifetimes measured in beam and trap experiments, is discussed in
the light of the these determinations of the CKM matrix elements.
| [
{
"created": "Thu, 6 Jun 2019 17:32:05 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Belfatto",
"Benedetta",
""
],
[
"Beradze",
"Revaz",
""
],
[
"Berezhiani",
"Zurab",
""
]
] | After the recent high precision determinations of $V_{us}$ and $V_{ud}$, the first row of the CKM matrix shows more than $4\sigma$ deviation from unitarity. Two possible scenarios beyond the Standard Model can be investigated in order to fill the gap. If a 4th quark $b'$ participates in the mixing, with $\vert V_{ub'} \vert \sim0.04$, then its mass should be no more than 6 TeV or so. A different solution can come from the introduction of the gauge horizontal family symmetry acting between the lepton families and spontaneously broken at the scale of about 6 TeV. Since the gauge bosons of this symmetry contribute to muon decay in positive interference with Standard Model, the Fermi constant is slightly smaller than the muon decay constant so that unitarity is recovered. Also the neutron lifetime problem, that is about $4\sigma$ discrepancy between the neutron lifetimes measured in beam and trap experiments, is discussed in the light of the these determinations of the CKM matrix elements. |
hep-ph/0111311 | Csaba Csaki | Csaba Csaki, Nemanja Kaloper and John Terning | Dimming Supernovae without Cosmic Acceleration | 11 pages, LaTex, 2 figures included. Comments on effects of
refraction within galaxies and references added | Phys.Rev.Lett.88:161302,2002 | 10.1103/PhysRevLett.88.161302 | SU-ITP-01/48 | hep-ph astro-ph gr-qc hep-th | null | We present a simple model where photons propagating in extra-galactic
magnetic fields can oscillate into very light axions. The oscillations may
convert some of the photons departing a distant supernova into axions, making
the supernova appear dimmer and hence more distant than it really is. Averaging
over different configurations of the magnetic field we find that the dimming
saturates at about 1/3 of the light from the supernovae at very large
redshifts. This results in a luminosity-distance vs. redshift curve almost
indistinguishable from that produced by the accelerating Universe, if the axion
mass and coupling scale are m ~ 10^-16 eV, M ~ 4 10^11 GeV. This phenomenon may
be an alternative to the accelerating Universe for explaining supernova
observations.
| [
{
"created": "Fri, 23 Nov 2001 21:01:39 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Dec 2001 17:06:58 GMT",
"version": "v2"
}
] | 2009-09-17 | [
[
"Csaki",
"Csaba",
""
],
[
"Kaloper",
"Nemanja",
""
],
[
"Terning",
"John",
""
]
] | We present a simple model where photons propagating in extra-galactic magnetic fields can oscillate into very light axions. The oscillations may convert some of the photons departing a distant supernova into axions, making the supernova appear dimmer and hence more distant than it really is. Averaging over different configurations of the magnetic field we find that the dimming saturates at about 1/3 of the light from the supernovae at very large redshifts. This results in a luminosity-distance vs. redshift curve almost indistinguishable from that produced by the accelerating Universe, if the axion mass and coupling scale are m ~ 10^-16 eV, M ~ 4 10^11 GeV. This phenomenon may be an alternative to the accelerating Universe for explaining supernova observations. |
1708.05316 | Carl E. Carlson | Carl E. Carlson (William and Mary), Barbara Pasquini (University of
Pavia), Vladyslav Pauk (Jefferson Laboratory), and Marc Vanderhaeghen
(Johannes Gutenberg University) | Beam normal spin asymmetry for the $e p \to e \Delta(1232)$ process | 18 pages, 9 figures | Phys. Rev. D 96, 113010 (2017) | 10.1103/PhysRevD.96.113010 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the single spin asymmetry for the $e p \to e \Delta(1232)$
process, for an electron beam polarized normal to the scattering plane. Such
single spin asymmetries vanish in the one-photon exchange approximation, and
are directly proportional to the absorptive part of a two-photon exchange
amplitude. As the intermediate state in such two-photon exchange process is on
its mass shell, the asymmetry allows one to access for the first time the
on-shell $\Delta \to \Delta$ as well as $N^\ast \to \Delta$ electromagnetic
transitions. We present the general formalism to describe the $e p \to e
\Delta$ beam normal spin asymmetry, and provide a numerical estimate of its
value using the nucleon, $\Delta(1232)$, $S_{11}(1535)$, and $D_{13}(1520)$
intermediate states. We compare our results with the first data from the
Qweak@JLab experiment and give predictions for the A4@MAMI experiment.
| [
{
"created": "Thu, 17 Aug 2017 14:48:13 GMT",
"version": "v1"
}
] | 2018-01-03 | [
[
"Carlson",
"Carl E.",
"",
"William and Mary"
],
[
"Pasquini",
"Barbara",
"",
"University of\n Pavia"
],
[
"Pauk",
"Vladyslav",
"",
"Jefferson Laboratory"
],
[
"Vanderhaeghen",
"Marc",
"",
"Johannes Gutenberg University"
]
] | We calculate the single spin asymmetry for the $e p \to e \Delta(1232)$ process, for an electron beam polarized normal to the scattering plane. Such single spin asymmetries vanish in the one-photon exchange approximation, and are directly proportional to the absorptive part of a two-photon exchange amplitude. As the intermediate state in such two-photon exchange process is on its mass shell, the asymmetry allows one to access for the first time the on-shell $\Delta \to \Delta$ as well as $N^\ast \to \Delta$ electromagnetic transitions. We present the general formalism to describe the $e p \to e \Delta$ beam normal spin asymmetry, and provide a numerical estimate of its value using the nucleon, $\Delta(1232)$, $S_{11}(1535)$, and $D_{13}(1520)$ intermediate states. We compare our results with the first data from the Qweak@JLab experiment and give predictions for the A4@MAMI experiment. |
hep-ph/9702223 | Jan Kwiecinski | J. Kwiecinski | Recent Developments in Low x Physics | 19 pages, LATEX, 8 figures, .ps. Based on lectures given at the
XXXVIth Cracow School of Theoretical Physics, Zakopane, Poland, June 1996 | Acta Phys.Polon.B27:3455-3480,1996 | null | INP /1756 PH | hep-ph | null | The QCD expectations for the behaviour of the deep inelastic scattering
structure functions in the region of small values of the Bjorken parameter $x$
are summarized. The Balitzkij, Lipatov, Fadin, Kuraev (BFKL) equation which
sums the leading powers of $\alpha_s ln(1/x)$ is described and confronted with
the "conventional" formalism based on the leading order QCD evolution
equations. The small $x$ behaviour of the spin dependent structure function
$g_1$ is also discussed. The dedicated measurements of the hadronic final state
in deep inelastic scattering at small $x$ probing the QCD pomeron are
described. This includes discussion of the deep inelastic scattering
accompanied by forward jets as well as production of forward prompt photons and
$\pi^0$-s. Finally the basic facts concerning the deep inelastic diffraction
are briefly summarized.
| [
{
"created": "Mon, 3 Feb 1997 12:12:56 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kwiecinski",
"J.",
""
]
] | The QCD expectations for the behaviour of the deep inelastic scattering structure functions in the region of small values of the Bjorken parameter $x$ are summarized. The Balitzkij, Lipatov, Fadin, Kuraev (BFKL) equation which sums the leading powers of $\alpha_s ln(1/x)$ is described and confronted with the "conventional" formalism based on the leading order QCD evolution equations. The small $x$ behaviour of the spin dependent structure function $g_1$ is also discussed. The dedicated measurements of the hadronic final state in deep inelastic scattering at small $x$ probing the QCD pomeron are described. This includes discussion of the deep inelastic scattering accompanied by forward jets as well as production of forward prompt photons and $\pi^0$-s. Finally the basic facts concerning the deep inelastic diffraction are briefly summarized. |
2302.08489 | Lalu Zamakhsyari | Mayumi Aoki, Shinya Kanemura, Michihisa Takeuchi, Lalu Zamakhsyari | Probing chirality structure in lepton-flavour-violating Higgs decay
$h\to\tau\mu$ at the LHC | Published in Phys. Rev. D 107, 055037, 27 pages, 8 figures and 5
tables | Phys. Rev. D 107 (2023), 055037 | 10.1103/PhysRevD.107.055037 | KANAZAWA-23-02, OU-HET 1166 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A phenomenological study for determining the chirality structure in
lepton-flavor-violating Higgs (hLFV) decays $h \to \tau\mu$ at the LHC is
presented. We estimate the effects of the $\tau$ polarization in the analysis
andthe importance of determining the relative visible momentum ratio $x$, and
show the analysis with a collinear mass $m_{col1}$ by assuming one missing
particle is appropriate. We find that the sensitivity would be generically
affected up to $\pm$ $4-6$~\% in terms of the BR$(h\to \tau\mu)$ upper bound,
and show the altered bounds on the $(|y_{\mu\tau}|, |y_{\tau\mu}|)$ plane. We
further study the benchmark scenarios, and demonstrate the sensitivity study
for the chirality structure using the relative visible momentum ratio. We find
that the two fully polarized cases, the $\tau_R$ and $\tau_L$ scenarios
consistent with the recently reported excess, are distinguishable at 2$\sigma$
level for 1000~fb$^{-1}$. We also show that a further improved study
potentially provides a similar sensitivity already for 139~fb$^{-1}$.
| [
{
"created": "Thu, 16 Feb 2023 18:49:34 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 2023 07:32:44 GMT",
"version": "v2"
}
] | 2023-03-28 | [
[
"Aoki",
"Mayumi",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Takeuchi",
"Michihisa",
""
],
[
"Zamakhsyari",
"Lalu",
""
]
] | A phenomenological study for determining the chirality structure in lepton-flavor-violating Higgs (hLFV) decays $h \to \tau\mu$ at the LHC is presented. We estimate the effects of the $\tau$ polarization in the analysis andthe importance of determining the relative visible momentum ratio $x$, and show the analysis with a collinear mass $m_{col1}$ by assuming one missing particle is appropriate. We find that the sensitivity would be generically affected up to $\pm$ $4-6$~\% in terms of the BR$(h\to \tau\mu)$ upper bound, and show the altered bounds on the $(|y_{\mu\tau}|, |y_{\tau\mu}|)$ plane. We further study the benchmark scenarios, and demonstrate the sensitivity study for the chirality structure using the relative visible momentum ratio. We find that the two fully polarized cases, the $\tau_R$ and $\tau_L$ scenarios consistent with the recently reported excess, are distinguishable at 2$\sigma$ level for 1000~fb$^{-1}$. We also show that a further improved study potentially provides a similar sensitivity already for 139~fb$^{-1}$. |
2208.04046 | Mainak Chakraborty | Mainak Chakraborty, Sourov Roy | Baryon asymmetry and lower bound on right handed neutrino mass in fast
expanding Universe: an analytical approach | 39 pages, 7 figures, improved version, figures modified, new
discussion added in the introduction, references updated, matches with the
version published in JCAP | JCAP11(2022)053 | 10.1088/1475-7516/2022/11/053 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The expansion rate of the Universe deviates from its standard value when the
total energy density includes contribution from a new scalar field apart from
the radiation energy density. The non-trivial modifications incurred in the
Boltzmann equations render the well known analytical solutions unsuitable in
non standard scenario. In the present study we derive analytical expressions
for the efficiency factor (which is nothing but solution of set of Boltzmann
equations) using certain legible approximations. A fair degree of accuracy of
these formulas have been observed by juxtaposing the analytical results with
that obtained through numerical solution of Boltzmann equations. Faster
expansion of the Universe results in decrement of the effective decay parameter
which brings down the amount of washout of asymmetry due to inverse decay. Thus
in non-standard cosmology scenario, a larger fraction of the asymmetry
(generated at early epoch) is expected to survive till present epoch.
Alteration of the cosmology does not affect the underlying particle physics
model responsible for the generation of the CP asymmetry. Therefore starting
from an identical particle physics model we will end up with a larger final
baryon asymmetry in the non-standard scenario. It hints towards the possible
relaxation of the lower bound of the lightest right handed neutrino mass
required to produce adequate asymmetry which is in agreement with current
experimental data.
| [
{
"created": "Mon, 8 Aug 2022 10:44:40 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Nov 2022 06:09:01 GMT",
"version": "v2"
}
] | 2022-11-29 | [
[
"Chakraborty",
"Mainak",
""
],
[
"Roy",
"Sourov",
""
]
] | The expansion rate of the Universe deviates from its standard value when the total energy density includes contribution from a new scalar field apart from the radiation energy density. The non-trivial modifications incurred in the Boltzmann equations render the well known analytical solutions unsuitable in non standard scenario. In the present study we derive analytical expressions for the efficiency factor (which is nothing but solution of set of Boltzmann equations) using certain legible approximations. A fair degree of accuracy of these formulas have been observed by juxtaposing the analytical results with that obtained through numerical solution of Boltzmann equations. Faster expansion of the Universe results in decrement of the effective decay parameter which brings down the amount of washout of asymmetry due to inverse decay. Thus in non-standard cosmology scenario, a larger fraction of the asymmetry (generated at early epoch) is expected to survive till present epoch. Alteration of the cosmology does not affect the underlying particle physics model responsible for the generation of the CP asymmetry. Therefore starting from an identical particle physics model we will end up with a larger final baryon asymmetry in the non-standard scenario. It hints towards the possible relaxation of the lower bound of the lightest right handed neutrino mass required to produce adequate asymmetry which is in agreement with current experimental data. |
1712.00087 | Sergei Demidov | S.V.Demidov, D.S.Gorbunov, D.V.Kirpichnikov | Gravitational waves from phase transition in split NMSSM | 8 pages, 2 figures, published version | null | 10.1016/j.physletb.2018.02.007 | INR-TH-2017-030 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss gravitational wave signal from the strongly first order
electroweak phase transition in the split NMSSM. We find that for sets of
parameters predicting successful electroweak baryogenesis the gravitational
wave signal can be within the reach of future experiments LISA, BBO and
Ultimate DECIGO.
| [
{
"created": "Thu, 30 Nov 2017 21:21:53 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2018 08:30:36 GMT",
"version": "v2"
}
] | 2018-12-12 | [
[
"Demidov",
"S. V.",
""
],
[
"Gorbunov",
"D. S.",
""
],
[
"Kirpichnikov",
"D. V.",
""
]
] | We discuss gravitational wave signal from the strongly first order electroweak phase transition in the split NMSSM. We find that for sets of parameters predicting successful electroweak baryogenesis the gravitational wave signal can be within the reach of future experiments LISA, BBO and Ultimate DECIGO. |
2001.05980 | Vasiliki Mitsou | D. Felea, J. Mamuzic, R. Mase{\l}ek, N. E. Mavromatos, V. A. Mitsou,
J. L. Pinfold, R. Ruiz de Austri, K. Sakurai, A. Santra and O. Vives | Prospects for discovering supersymmetric long-lived particles with
MoEDAL | 12 pages, 6 figures; preliminary results presented in
arXiv:1903.11022; matches published version in EPJC | Eur.Phys.J.C 80 (2020) 5, 431 | 10.1140/epjc/s10052-020-7994-7 | IFIC/19-58, FTUV-19-1216, KCL-PH-TH/2019-93 | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study on the possibility of searching for long-lived
supersymmetric partners with the MoEDAL experiment at the LHC. MoEDAL is
sensitive to highly ionising objects such as magnetic monopoles or massive
(meta)stable electrically charged particles. We focus on prospects of directly
detecting long-lived sleptons in a phenomenologically realistic model which
involves an intermediate neutral long-lived particle in the decay chain. This
scenario is not yet excluded by the current data from ATLAS or CMS, and is
compatible with astrophysical constraints. Using Monte Carlo simulation, we
compare the sensitivities of MoEDAL versus ATLAS in scenarios where MoEDAL
could provide discovery reach complementary to ATLAS and CMS, thanks to looser
selection criteria combined with the virtual absence of background. It is also
interesting to point out that, in such scenarios, in which charged staus are
the main long-lived candidates, the relevant mass range for MoEDAL is
compatible with a potential role of Supersymmetry in providing an explanation
for the anomalous events observed by the ANITA detector.
| [
{
"created": "Thu, 16 Jan 2020 18:27:30 GMT",
"version": "v1"
},
{
"created": "Sun, 24 May 2020 21:47:33 GMT",
"version": "v2"
}
] | 2020-05-26 | [
[
"Felea",
"D.",
""
],
[
"Mamuzic",
"J.",
""
],
[
"Masełek",
"R.",
""
],
[
"Mavromatos",
"N. E.",
""
],
[
"Mitsou",
"V. A.",
""
],
[
"Pinfold",
"J. L.",
""
],
[
"de Austri",
"R. Ruiz",
""
],
[
"Sakurai",
"K.",
""
],
[
"Santra",
"A.",
""
],
[
"Vives",
"O.",
""
]
] | We present a study on the possibility of searching for long-lived supersymmetric partners with the MoEDAL experiment at the LHC. MoEDAL is sensitive to highly ionising objects such as magnetic monopoles or massive (meta)stable electrically charged particles. We focus on prospects of directly detecting long-lived sleptons in a phenomenologically realistic model which involves an intermediate neutral long-lived particle in the decay chain. This scenario is not yet excluded by the current data from ATLAS or CMS, and is compatible with astrophysical constraints. Using Monte Carlo simulation, we compare the sensitivities of MoEDAL versus ATLAS in scenarios where MoEDAL could provide discovery reach complementary to ATLAS and CMS, thanks to looser selection criteria combined with the virtual absence of background. It is also interesting to point out that, in such scenarios, in which charged staus are the main long-lived candidates, the relevant mass range for MoEDAL is compatible with a potential role of Supersymmetry in providing an explanation for the anomalous events observed by the ANITA detector. |
0704.1604 | Jeff Harvey | Sophia K. Domokos and Jeffrey A. Harvey | Baryon Number-Induced Chern-Simons Couplings of Vector and Axial-Vector
Mesons in Holographic QCD | 4 pages | Phys.Rev.Lett.99:141602,2007 | 10.1103/PhysRevLett.99.141602 | EFI-07-08 | hep-ph hep-th | null | We show that holographic models of QCD predict the presence of a Chern-Simons
coupling between vector and axial-vector mesons at finite baryon density. In
the AdS/CFT dictionary, the coefficient of this coupling is proportional to the
baryon number density, and is fixed uniquely in the five-dimensional
holographic dual by anomalies in the flavor currents. For the lightest mesons,
the coupling mixes transverse $\rho$ and $a_1$ polarization states. At
sufficiently large baryon number densities, it produces an instability, which
causes the $\rho$ and $a_1$ mesons to condense in a state breaking both
rotational and translational invariance.
| [
{
"created": "Thu, 12 Apr 2007 15:55:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Domokos",
"Sophia K.",
""
],
[
"Harvey",
"Jeffrey A.",
""
]
] | We show that holographic models of QCD predict the presence of a Chern-Simons coupling between vector and axial-vector mesons at finite baryon density. In the AdS/CFT dictionary, the coefficient of this coupling is proportional to the baryon number density, and is fixed uniquely in the five-dimensional holographic dual by anomalies in the flavor currents. For the lightest mesons, the coupling mixes transverse $\rho$ and $a_1$ polarization states. At sufficiently large baryon number densities, it produces an instability, which causes the $\rho$ and $a_1$ mesons to condense in a state breaking both rotational and translational invariance. |
hep-ph/0103046 | Youichi Yamada | Youichi Yamada | Gauge dependence of the on-shell renormalized mixing matrices | 16 pages, minor corrections | Phys.Rev. D64 (2001) 036008 | 10.1103/PhysRevD.64.036008 | TU-612 | hep-ph | null | It was recently pointed out that the on-shell renormalization of the
Cabibbo-Kobayashi-Maskawa (CKM) matrix in the method by Denner and Sack causes
a gauge parameter dependence of the amplitudes. We analyze the gauge dependence
of the on-shell renormalization of the mixing matrices both for fermions and
scalars in general cases, at the one-loop level. We then show that this gauge
dependence can be avoided by fixing the counterterms for the mixing matrices in
terms of the off-diagonal wave function corrections for fermions and scalars
after a rearrangement, in a similar manner to the pinch technique for gauge
bosons. We finally present explicit calculation of the gauge dependence for two
cases: CKM matrix in the Standard Model, and left-right mixing of scalar quarks
in the minimal supersymmetric standard model.
| [
{
"created": "Mon, 5 Mar 2001 10:41:38 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2001 09:09:05 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Jun 2001 00:45:28 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Yamada",
"Youichi",
""
]
] | It was recently pointed out that the on-shell renormalization of the Cabibbo-Kobayashi-Maskawa (CKM) matrix in the method by Denner and Sack causes a gauge parameter dependence of the amplitudes. We analyze the gauge dependence of the on-shell renormalization of the mixing matrices both for fermions and scalars in general cases, at the one-loop level. We then show that this gauge dependence can be avoided by fixing the counterterms for the mixing matrices in terms of the off-diagonal wave function corrections for fermions and scalars after a rearrangement, in a similar manner to the pinch technique for gauge bosons. We finally present explicit calculation of the gauge dependence for two cases: CKM matrix in the Standard Model, and left-right mixing of scalar quarks in the minimal supersymmetric standard model. |
hep-ph/9906450 | Antonio Marrone | G. L. Fogli, E. Lisi, A. Marrone, G. Scioscia | Comments on atmospheric neutrino oscillation scenarios with large nu_mu
<-> nu_e transitions | 14 pages, 5 figures | null | null | null | hep-ph | null | The evidence for $\nu_\mu$ disappearance in the Super-Kamiokande atmospheric
neutrino experiment and the negative searches for $\nu_e$ disappearance in the
CHOOZ reactor experiment can be easily reconciled by assuming oscillations with
large amplitude in the $\nu_\mu\leftrightarrow\nu_\tau$ channel and small (or
null) amplitude in the $\nu_\mu\leftrightarrow\nu_e$ channel. It has been
claimed, however, that some oscillation scenarios with large
$\nu_\mu\leftrightarrow\nu_e$ mixing can also be constructed in agreement with
the present data. We investigate quantitatively two such scenarios: (a)
threefold maximal mixing; and (b) attempts to fit all sources of evidence for
oscillations (solar, atmospheric, and accelerator) with three neutrinos. By
using mainly Super-Kamiokande data, we show that the case (a) is disfavored,
and that the case (b) is definitely ruled out.
| [
{
"created": "Tue, 22 Jun 1999 09:34:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fogli",
"G. L.",
""
],
[
"Lisi",
"E.",
""
],
[
"Marrone",
"A.",
""
],
[
"Scioscia",
"G.",
""
]
] | The evidence for $\nu_\mu$ disappearance in the Super-Kamiokande atmospheric neutrino experiment and the negative searches for $\nu_e$ disappearance in the CHOOZ reactor experiment can be easily reconciled by assuming oscillations with large amplitude in the $\nu_\mu\leftrightarrow\nu_\tau$ channel and small (or null) amplitude in the $\nu_\mu\leftrightarrow\nu_e$ channel. It has been claimed, however, that some oscillation scenarios with large $\nu_\mu\leftrightarrow\nu_e$ mixing can also be constructed in agreement with the present data. We investigate quantitatively two such scenarios: (a) threefold maximal mixing; and (b) attempts to fit all sources of evidence for oscillations (solar, atmospheric, and accelerator) with three neutrinos. By using mainly Super-Kamiokande data, we show that the case (a) is disfavored, and that the case (b) is definitely ruled out. |
hep-ph/0209285 | Ja. V. Burdanov | Ja.V. Burdanov, G.V. Efimov | Glueball as a bound state in the self-dual homogeneous gluon field | 3 pages. Parallel talk given at the 5rd International Conference on
Quark Confinement and the Hadron Spectrum (Confinement V), Gargnano, Italy,
September 10-14, 2002. To appear in the proceedings | null | 10.1142/9789812704269_0061 | null | hep-ph | null | Using a simple relativistic QFT model of scalar fields we demonstrate that
the analytic confinement (propagator is an entire function in the complex
$p^2$--plane) and the weak coupling constant lead to the Regge behaviour of the
two-particle bound states. In QCD we assume that the gluon vacuum is realized
by the self-dual homogeneous classical field which is the solution of the
Yang-Mills equations. This assumption leads to analytical confinement of quarks
and gluons. We extract the colorless $0^{++}$ two-gluon state from the QCD
generating functional in the one-gluon exchange approximation. The mass of this
bound state is defined by the Bethe-Salpeter equation. The glueball mass is
$1765~{\rm MeV}$ for $\alpha_s=0.33$ if the gluon condensate is
$<(\alpha_s/\pi) G G >=0.012~{\rm GeV}^4$.
| [
{
"created": "Tue, 24 Sep 2002 14:35:15 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Burdanov",
"Ja. V.",
""
],
[
"Efimov",
"G. V.",
""
]
] | Using a simple relativistic QFT model of scalar fields we demonstrate that the analytic confinement (propagator is an entire function in the complex $p^2$--plane) and the weak coupling constant lead to the Regge behaviour of the two-particle bound states. In QCD we assume that the gluon vacuum is realized by the self-dual homogeneous classical field which is the solution of the Yang-Mills equations. This assumption leads to analytical confinement of quarks and gluons. We extract the colorless $0^{++}$ two-gluon state from the QCD generating functional in the one-gluon exchange approximation. The mass of this bound state is defined by the Bethe-Salpeter equation. The glueball mass is $1765~{\rm MeV}$ for $\alpha_s=0.33$ if the gluon condensate is $<(\alpha_s/\pi) G G >=0.012~{\rm GeV}^4$. |
0709.1824 | Tania Robens | Tania Robens | Monte Carlo Simulations for NLO Chargino Production at the ILC | 4 pages, 6 figures, to appear in the proceedings of the International
Linear Collider Workshop LCWS07, Hamburg, 2007 v2: updated bibliography
information | ECONF C0705302:SUS08,2007 | null | PITHA 07/10, SFB/CPP-07-51 | hep-ph | null | We present an extension of the Monte Carlo Event Generator Whizard which
includes chargino production at the ILC at NLO. We include photons using both a
fixed order and a resummation approach. In the latter, leading higher order
corrections are automatically included. We present results for cross sections
and event generation for both methods.
| [
{
"created": "Wed, 12 Sep 2007 12:30:58 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Sep 2007 11:47:54 GMT",
"version": "v2"
}
] | 2009-02-16 | [
[
"Robens",
"Tania",
""
]
] | We present an extension of the Monte Carlo Event Generator Whizard which includes chargino production at the ILC at NLO. We include photons using both a fixed order and a resummation approach. In the latter, leading higher order corrections are automatically included. We present results for cross sections and event generation for both methods. |
1710.04397 | Alexander E. Dorokhov | A.E. Dorokhov, N.I. Kochelev, A.P. Martynenko, F.A. Martynenko, A.E.
Radzhabov, R.N. Faustov | The contribution of pseudoscalar and axial-vector mesons to hyperfine
structure of muonic hydrogen | 6 pages, 1 figure; Invited talk contribution to XVII Workshop on High
Energy Spin Physics: DSPIN-17; Dubna, Russia, September 11 - 15, 2017 | null | 10.1088/1742-6596/938/1/012042 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the quasipotential method in quantum electrodynamics we
calculate the contribution of light pseudoscalar (PS) and axial-vector (AV)
mesons to the interaction operator of a muon and a proton in muonic hydrogen
atom. The coupling of mesons with the muon is via two-photon intermediate
state. The parametrization of the transition form factor of two photons into PS
and AV mesons, based on the experimental data on the transition form factors
and QCD asymptotics, is used. Numerical estimates of the contributions to the
hyperfine structure of the spectrum of the S and P levels are presented. It is
shown that such contribution to the hyperfine splitting in muonic hydrogen is
rather important for a comparison with precise experimental data.
| [
{
"created": "Thu, 12 Oct 2017 07:51:54 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jan 2018 07:50:40 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Dorokhov",
"A. E.",
""
],
[
"Kochelev",
"N. I.",
""
],
[
"Martynenko",
"A. P.",
""
],
[
"Martynenko",
"F. A.",
""
],
[
"Radzhabov",
"A. E.",
""
],
[
"Faustov",
"R. N.",
""
]
] | In the framework of the quasipotential method in quantum electrodynamics we calculate the contribution of light pseudoscalar (PS) and axial-vector (AV) mesons to the interaction operator of a muon and a proton in muonic hydrogen atom. The coupling of mesons with the muon is via two-photon intermediate state. The parametrization of the transition form factor of two photons into PS and AV mesons, based on the experimental data on the transition form factors and QCD asymptotics, is used. Numerical estimates of the contributions to the hyperfine structure of the spectrum of the S and P levels are presented. It is shown that such contribution to the hyperfine splitting in muonic hydrogen is rather important for a comparison with precise experimental data. |
2404.09701 | Andreas Vogt | G. Falcioni (Zurich U.), F. Herzog (U. Edinburgh, Higgs Ctr. Theor.
Phys.), S. Moch (Hamburg U., Inst. Theor. Phys. II), A. Pelloni (Zurich,
ETH), A. Vogt (Liverpool U., Dept. Math.) | Four-loop splitting functions in QCD -- The quark-to-gluon case | 15 pages, LaTex, 2 figures, 2 ancillary files (FORM file with results
and FORTRAN subroutine) | null | null | ZU-TH 20/24, DESY-24-053, LTH 1367 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present the even-N moments N =< 20 of the fourth-order (N^3LO)
contribution P_{gq}^(3)(x) to the quark-to-gluon splitting function in
perturbative QCD. These moments, obtained by analytically computing off-shell
operator matrix elements for a general gauge group, agree with all known
results, in particular with the moments N =< 10 derived before from structure
functions in deep-inelastic scattering. Using the new moments and the available
endpoint constraints, we construct approximations for P_{gq}^(3)(x) which
improve upon those obtained from the lowest five even moments. The remaining
uncertainties of this function are now practically irrelevant at momentum
fractions x > 0.1. The resulting errors of the convolution of P_{gq} at N^3LO
with a typical quark distribution are small at x >~ 10^{-3} and exceed 1% only
at x ~< 10^{-4} for a strong coupling alpha_s = 0.2. The present results for
P_{gq}^(3)(x) should thus be sufficient for most collider-physics applications.
| [
{
"created": "Mon, 15 Apr 2024 12:00:48 GMT",
"version": "v1"
}
] | 2024-04-16 | [
[
"Falcioni",
"G.",
"",
"Zurich U."
],
[
"Herzog",
"F.",
"",
"U. Edinburgh, Higgs Ctr. Theor.\n Phys."
],
[
"Moch",
"S.",
"",
"Hamburg U., Inst. Theor. Phys. II"
],
[
"Pelloni",
"A.",
"",
"Zurich,\n ETH"
],
[
"Vogt",
"A.",
"",
"Liverpool U., Dept. Math."
]
] | We present the even-N moments N =< 20 of the fourth-order (N^3LO) contribution P_{gq}^(3)(x) to the quark-to-gluon splitting function in perturbative QCD. These moments, obtained by analytically computing off-shell operator matrix elements for a general gauge group, agree with all known results, in particular with the moments N =< 10 derived before from structure functions in deep-inelastic scattering. Using the new moments and the available endpoint constraints, we construct approximations for P_{gq}^(3)(x) which improve upon those obtained from the lowest five even moments. The remaining uncertainties of this function are now practically irrelevant at momentum fractions x > 0.1. The resulting errors of the convolution of P_{gq} at N^3LO with a typical quark distribution are small at x >~ 10^{-3} and exceed 1% only at x ~< 10^{-4} for a strong coupling alpha_s = 0.2. The present results for P_{gq}^(3)(x) should thus be sufficient for most collider-physics applications. |
1103.0081 | Yonglu Liu | Yong-lu Liu, Long-fei Gan and Ming-qiu Huang | The exclusive rare decay b->s gamma of heavy b-Baryons | 10 pages, 4 figures; to appear in Phys. Rev. D | Phys.Rev.D83:054007,2011 | 10.1103/PhysRevD.83.054007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis on the exclusive rare radiative decay modes
Sigma_b->Sigma gamma and Xi_b->Xi gamma. The transition form factors which
parameterize these processes are calculated using QCD light-cone sum rules. The
decay widths we predict are Gamma(Sigma_b->Sigma
gamma)=(7.21\pm0.04)\times10^{-18}GeV} and Gamma(Xi_b->Xi
gamma)=(1.34\pm0.07)\times10^{-16}GeV. The Branching ratio of Xi_b->Xi gamma is
predicted to be Br(\Xi_b->Xi gamma)=(3.03\pm0.10)\times10^{-4}.
| [
{
"created": "Tue, 1 Mar 2011 04:47:25 GMT",
"version": "v1"
}
] | 2011-03-21 | [
[
"Liu",
"Yong-lu",
""
],
[
"Gan",
"Long-fei",
""
],
[
"Huang",
"Ming-qiu",
""
]
] | We present an analysis on the exclusive rare radiative decay modes Sigma_b->Sigma gamma and Xi_b->Xi gamma. The transition form factors which parameterize these processes are calculated using QCD light-cone sum rules. The decay widths we predict are Gamma(Sigma_b->Sigma gamma)=(7.21\pm0.04)\times10^{-18}GeV} and Gamma(Xi_b->Xi gamma)=(1.34\pm0.07)\times10^{-16}GeV. The Branching ratio of Xi_b->Xi gamma is predicted to be Br(\Xi_b->Xi gamma)=(3.03\pm0.10)\times10^{-4}. |
hep-ph/9911402 | Norberto N. Scoccola | Norberto N. Scoccola | Multibaryons in the Skyrme model | 7 pages. To be published in the Proc. of "Hadron Physics 99".
Coimbra, Portugal. September 10- 15, 1999 | null | 10.1063/1.1303011 | null | hep-ph | null | Low-lying multibaryon configurations are studied within the bound state
approach to the SU(3) Skyrme model. We use approximate ansaetze for the static
background fields based on rational maps which have the same symmetries of the
exact solutions. To determine the explicit form of the collective Hamiltonians
and wave functions we only make use of these symmetries. Thus, the expressions
obtained are also valid in the exact case. On the other hand, the meson
bindings, inertia parameters and hyperfine splitting constants we calculate do
depend on the detailed form of the ansaetze and are, therefore, approximate.
Using these values we compute the low-lying spectra of multibaryons with B =< 9
and strangeness 0 and -B. With these results the stability of some multilambda
configurations is discussed.
| [
{
"created": "Thu, 18 Nov 1999 17:19:30 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Scoccola",
"Norberto N.",
""
]
] | Low-lying multibaryon configurations are studied within the bound state approach to the SU(3) Skyrme model. We use approximate ansaetze for the static background fields based on rational maps which have the same symmetries of the exact solutions. To determine the explicit form of the collective Hamiltonians and wave functions we only make use of these symmetries. Thus, the expressions obtained are also valid in the exact case. On the other hand, the meson bindings, inertia parameters and hyperfine splitting constants we calculate do depend on the detailed form of the ansaetze and are, therefore, approximate. Using these values we compute the low-lying spectra of multibaryons with B =< 9 and strangeness 0 and -B. With these results the stability of some multilambda configurations is discussed. |
1010.2329 | Enrique Fernandez-Martinez | Enrique Fernandez-Martinez and Davide Meloni | Importance of nuclear effects in the measurement of neutrino oscillation
parameters | Error in cross section implementation corrected and sensitivities
reevaluated accordingly. Relative performance of diffrent models and
conclusions unchanged. Version to be published in PLB | Phys.Lett.B697:477-481,2011 | 10.1016/j.physletb.2011.02.043 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate how models for neutrino-nucleus cross sections based on
different assumptions for the nuclear dynamics affect the forecasted
sensitivities to neutrino oscillation parameters at future neutrino facilities.
We limit ourselves to the quasi-elastic regime, where the neutrino cross
sections can be evaluated with less uncertainties, and discuss the sensitivity
reach to theta_{13} and the CP violation phase at a prototype low-gamma
beta-beam, mostly sensitive to the quasi-elastic regime.
| [
{
"created": "Tue, 12 Oct 2010 09:38:11 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2011 13:41:05 GMT",
"version": "v2"
}
] | 2011-03-07 | [
[
"Fernandez-Martinez",
"Enrique",
""
],
[
"Meloni",
"Davide",
""
]
] | We investigate how models for neutrino-nucleus cross sections based on different assumptions for the nuclear dynamics affect the forecasted sensitivities to neutrino oscillation parameters at future neutrino facilities. We limit ourselves to the quasi-elastic regime, where the neutrino cross sections can be evaluated with less uncertainties, and discuss the sensitivity reach to theta_{13} and the CP violation phase at a prototype low-gamma beta-beam, mostly sensitive to the quasi-elastic regime. |
0909.5336 | Peter Athron | P. Athron (1), S.F. King (2), D.J. Miller (3), S. Moretti (2 and 4),
R. Nevzorov (3) ((1) TU Dresden, (2) University of Southampton, (3)
University of Glasgow, (4) Turin University) | Phenomenological Consequences of the Constrained Exceptional
Supersymmetric Standard Model | Contribution to the proceedings of SUSY 09, Boston, USA, June 2009, 4
pages | AIP Conf.Proc.1200:454-457,2010 | 10.1063/1.3327617 | DFTT 62/2009, SHEP-09-22 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Exceptional Supersymmetric Standard Model (E$_6$SSM) provides a low
energy alternative to the MSSM, with an extra gauged U(1)$_N$ symmetry, solving
the $\mu$-problem of the MSSM. Inspired by the possible embedding into an E$_6$
GUT, the matter content fills three generations of E$_6$ multiplets, thus
predicting exciting exotic matter such as diquarks or leptoquarks. We present
predictions from a constrained version of the model (cE$_6$SSM), with a
universal scalar mass $m_0$, trilinear mass $A$ and gaugino mass $M_{1/2}$. We
reveal a large volume of the cE$_6$SSM parameter space where the correct
breakdown of the gauge symmetry is achieved and all experimental constraints
satisfied. We predict a hierarchical particle spectrum with heavy scalars and
light gauginos, while the new exotic matter can be light or heavy depending on
parameters. We present representative cE$_6$SSM scenarios, demonstrating that
there could be light exotic particles, like leptoquarks and a U(1)$_N$ Z'
boson, with spectacular signals at the LHC.
| [
{
"created": "Tue, 29 Sep 2009 17:55:06 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Athron",
"P.",
"",
"2 and 4"
],
[
"King",
"S. F.",
"",
"2 and 4"
],
[
"Miller",
"D. J.",
"",
"2 and 4"
],
[
"Moretti",
"S.",
"",
"2 and 4"
],
[
"Nevzorov",
"R.",
""
]
] | The Exceptional Supersymmetric Standard Model (E$_6$SSM) provides a low energy alternative to the MSSM, with an extra gauged U(1)$_N$ symmetry, solving the $\mu$-problem of the MSSM. Inspired by the possible embedding into an E$_6$ GUT, the matter content fills three generations of E$_6$ multiplets, thus predicting exciting exotic matter such as diquarks or leptoquarks. We present predictions from a constrained version of the model (cE$_6$SSM), with a universal scalar mass $m_0$, trilinear mass $A$ and gaugino mass $M_{1/2}$. We reveal a large volume of the cE$_6$SSM parameter space where the correct breakdown of the gauge symmetry is achieved and all experimental constraints satisfied. We predict a hierarchical particle spectrum with heavy scalars and light gauginos, while the new exotic matter can be light or heavy depending on parameters. We present representative cE$_6$SSM scenarios, demonstrating that there could be light exotic particles, like leptoquarks and a U(1)$_N$ Z' boson, with spectacular signals at the LHC. |
0808.2512 | Douglas Gingrich Mr. | Douglas M. Gingrich and Kevin Martell | Study of highly-excited string states at the Large Hadron Collider | expanded discussion on backgrounds | Phys.Rev.D78:115009,2008 | 10.1103/PhysRevD.78.115009 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In TeV-scale gravity scenarios with large extra dimensions, black holes may
be produced at future colliders. Good arguments have been made for why general
relativistic black holes may be just out of reach of the Large Hadron Collider
(LHC). However, in weakly-coupled string theory, highly excited string states -
string balls - could be produced at the LHC with high rates and decay
thermally, not unlike general relativistic black holes. In this paper, we
simulate and study string ball production and decay at the LHC. We specifically
emphasize the experimentally-detectable similarities and differences between
string balls and general relativistic black holes at a TeV scale.
| [
{
"created": "Tue, 19 Aug 2008 18:10:45 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Aug 2008 18:45:40 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Nov 2008 01:27:14 GMT",
"version": "v3"
}
] | 2008-12-30 | [
[
"Gingrich",
"Douglas M.",
""
],
[
"Martell",
"Kevin",
""
]
] | In TeV-scale gravity scenarios with large extra dimensions, black holes may be produced at future colliders. Good arguments have been made for why general relativistic black holes may be just out of reach of the Large Hadron Collider (LHC). However, in weakly-coupled string theory, highly excited string states - string balls - could be produced at the LHC with high rates and decay thermally, not unlike general relativistic black holes. In this paper, we simulate and study string ball production and decay at the LHC. We specifically emphasize the experimentally-detectable similarities and differences between string balls and general relativistic black holes at a TeV scale. |
1008.3516 | Fulvia De Fazio | Fulvia De Fazio | $B_s \to f_0(980)$ decays: Results from light-cone QCD Sum Rules | Talk given at QCD 10, 15th International QCD Conference, 28th June -
3rd July, Montpellier (France). LaTeX, 4 pages, 2 figures | Nucl.Phys.Proc.Suppl.207-208:261-264,2010 | 10.1016/j.nuclphysbps.2010.10.067 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a light-cone QCD sum rule calculation of the $B_s\to f_0(980)$
transition form factors useful to predict the branching ratios of the rare
decays $B_s \to f_0 \ell^+ \ell^-$, $B_s \to f_0 \nu \bar \nu$ and of $B_s\to
J/\psi f_0$ decay assuming factorization. We compare this channel to $B_s \to
J/\psi \phi$ as far as the possibility to determine the $B_s$ mixing phase is
concerned.
| [
{
"created": "Fri, 20 Aug 2010 14:31:14 GMT",
"version": "v1"
}
] | 2011-02-15 | [
[
"De Fazio",
"Fulvia",
""
]
] | We describe a light-cone QCD sum rule calculation of the $B_s\to f_0(980)$ transition form factors useful to predict the branching ratios of the rare decays $B_s \to f_0 \ell^+ \ell^-$, $B_s \to f_0 \nu \bar \nu$ and of $B_s\to J/\psi f_0$ decay assuming factorization. We compare this channel to $B_s \to J/\psi \phi$ as far as the possibility to determine the $B_s$ mixing phase is concerned. |
1201.1556 | Subhadeep Mondal | Subhadeep Mondal, Sanjoy Biswas, Pradipta Ghosh, Sourov Roy | Exploring novel correlations in trilepton channels at the LHC for the
minimal supersymmetric inverse seesaw model | 28 pages, 9 .eps figures. 3 new figures and discussions on LHC
observables added, minor modifications in text and in the abstract, 23 new
references added, matches with the published version in JHEP | null | 10.1007/JHEP05(2012)134 | FTUAM-12-80; IFT-UAM/CSIC-12-02 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate signatures of the minimal supersymmetric inverse seesaw model
at the large hadron collider (LHC) with three isolated leptons and large
missing energy (3\ell + \mET or 2\ell + 1\tau + \mET, with \ell=e,\mu) in the
final state. This signal has its origin in the decay of chargino-neutralino
(\chpm1\ntrl2) pair, produced in pp collisions. The two body decays of the
lighter chargino into a charged lepton and a singlet sneutrino has a
characteristic decay pattern which is correlated with the observed large
atmospheric neutrino mixing angle. This correlation is potentially observable
at the LHC by looking at the ratios of cross sections of the trilepton + \mET
channels in certain flavour specific modes. We show that even after considering
possible leading standard model backgrounds these final states can lead to
reasonable discovery significance at the LHC with both 7 TeV and 14 TeV
center-of-mass energy.
| [
{
"created": "Sat, 7 Jan 2012 13:32:47 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jun 2012 10:30:07 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Mondal",
"Subhadeep",
""
],
[
"Biswas",
"Sanjoy",
""
],
[
"Ghosh",
"Pradipta",
""
],
[
"Roy",
"Sourov",
""
]
] | We investigate signatures of the minimal supersymmetric inverse seesaw model at the large hadron collider (LHC) with three isolated leptons and large missing energy (3\ell + \mET or 2\ell + 1\tau + \mET, with \ell=e,\mu) in the final state. This signal has its origin in the decay of chargino-neutralino (\chpm1\ntrl2) pair, produced in pp collisions. The two body decays of the lighter chargino into a charged lepton and a singlet sneutrino has a characteristic decay pattern which is correlated with the observed large atmospheric neutrino mixing angle. This correlation is potentially observable at the LHC by looking at the ratios of cross sections of the trilepton + \mET channels in certain flavour specific modes. We show that even after considering possible leading standard model backgrounds these final states can lead to reasonable discovery significance at the LHC with both 7 TeV and 14 TeV center-of-mass energy. |
hep-ph/9309308 | Terry Goldman | G. J. Stephenson Jr. and T. Goldman | Observable Consequences of a Scalar Boson Coupled only to Neutrinos | 15 pages, LaTeX, 2 figures in uuencoded, compressed format, Los
Alamos preprint LA-UR-93-3348 | null | null | null | hep-ph astro-ph nucl-th | null | We have examined the consequences of assuming the existence of a light scalar
boson, weakly coupled to neutrinos, and not coupled to any other light
fermions. For a range of parameters, we find that this hypothesis leads to the
development of neutrino clusters which form in the early Universe and which
provide gravitational fluctuations on scales small compared to a parsec (i.e.,
the scale of solar systems). The existence of such clustering produces an
effect which would appear as a negative mass squared for the electron neutrino
in Tritium beta decay, without conflicting with other experiments. The neutrino
masses arising in unified gauge theories would then be very much larger than
the masses extracted from experiments within the solar system.
| [
{
"created": "Tue, 21 Sep 1993 20:44:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Stephenson",
"G. J.",
"Jr."
],
[
"Goldman",
"T.",
""
]
] | We have examined the consequences of assuming the existence of a light scalar boson, weakly coupled to neutrinos, and not coupled to any other light fermions. For a range of parameters, we find that this hypothesis leads to the development of neutrino clusters which form in the early Universe and which provide gravitational fluctuations on scales small compared to a parsec (i.e., the scale of solar systems). The existence of such clustering produces an effect which would appear as a negative mass squared for the electron neutrino in Tritium beta decay, without conflicting with other experiments. The neutrino masses arising in unified gauge theories would then be very much larger than the masses extracted from experiments within the solar system. |
hep-ph/9312282 | Haim Goldberg | Haim Goldberg | Gaugino Condensation as the Origin of Primordial Fluctuations | 11 pages, plain LaTex, report #NUB-3082/93-Th | null | null | null | hep-ph astro-ph | null | I present a model for inflation based on the gaugino-dilaton dynamics of
supersymmetry breaking. The inflaton is the dimension--1 scalar field $\phi$
related to the gaugino condensate via $\lambda^T\lambda=\phi^3.$ Recent work in
this area is used to obtain two significant results: (1) Scalar density
fluctuations at second horizon crossing are generated on scale $\lambda$ with
amplitude \[ \drr=A\cdot \ 10^3\cdot\
\left(\frac{m_{SUSY}}{m_{Pl}}\right)^{\half}\ \left(\frac{\lambda}{100\
\mbox{Mpc}}\right)^{0.03}\ \ , \] where $A$ is a constant which depends on
(unknown) details of gaugino-dilaton dynamics in the strong-coupling phase.
Agreement with COBE results is obtained if $A\simeq 2.$ \ (2) Due to mixing
with hidden sector glueballs, the dilaton mass is large $(\sim \left(\mp\
\ms^2\right)^ {\frac{1}{3}}\sim 10^8\ \mbox{GeV}),$ and reheating takes place
at $T\sim 1\tev.$ This {\em necessitates} that the presently observed baryon
asymmetry be generated at a cosmic temperature below 1 TeV.
| [
{
"created": "Wed, 15 Dec 1993 02:35:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goldberg",
"Haim",
""
]
] | I present a model for inflation based on the gaugino-dilaton dynamics of supersymmetry breaking. The inflaton is the dimension--1 scalar field $\phi$ related to the gaugino condensate via $\lambda^T\lambda=\phi^3.$ Recent work in this area is used to obtain two significant results: (1) Scalar density fluctuations at second horizon crossing are generated on scale $\lambda$ with amplitude \[ \drr=A\cdot \ 10^3\cdot\ \left(\frac{m_{SUSY}}{m_{Pl}}\right)^{\half}\ \left(\frac{\lambda}{100\ \mbox{Mpc}}\right)^{0.03}\ \ , \] where $A$ is a constant which depends on (unknown) details of gaugino-dilaton dynamics in the strong-coupling phase. Agreement with COBE results is obtained if $A\simeq 2.$ \ (2) Due to mixing with hidden sector glueballs, the dilaton mass is large $(\sim \left(\mp\ \ms^2\right)^ {\frac{1}{3}}\sim 10^8\ \mbox{GeV}),$ and reheating takes place at $T\sim 1\tev.$ This {\em necessitates} that the presently observed baryon asymmetry be generated at a cosmic temperature below 1 TeV. |
2309.09740 | Jie Tang | Yuchao Gu, Jie Tang, Lei Wu, Bin Zhu | Probing Light DM through Migdal Effect with Spherical Proportional
Counter | 22 pages, 7 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Owing to its low electronic noise and flexible target materials, the
Spherical Proportional Counter (SPC) with a single electron detection threshold
can be utilized to search for sub-GeV dark matter (DM). In this work, we
investigate the prospects for light DM direct detection through the DM-nucleus
Migdal effect in the DARKSPHERE detector. We consider the different DM velocity
distributions and momentum-transfer effects. For Xenon and Neon targets, we
find that the DM mass $m_{DM}$ can be probed down to as low as $m_{DM} \sim
\mathcal{O}$(10) MeV, and the derived bounds on the DM-nucleus scattering cross
section $\bar{\sigma}_{n}$ are sensitive to the high-velocity tails of the DM
velocity distribution, which can be altered by orders of magnitude for the
different DM velocity distributions in the region $m_{DM} < 10$ MeV.
| [
{
"created": "Mon, 18 Sep 2023 13:05:39 GMT",
"version": "v1"
}
] | 2023-09-19 | [
[
"Gu",
"Yuchao",
""
],
[
"Tang",
"Jie",
""
],
[
"Wu",
"Lei",
""
],
[
"Zhu",
"Bin",
""
]
] | Owing to its low electronic noise and flexible target materials, the Spherical Proportional Counter (SPC) with a single electron detection threshold can be utilized to search for sub-GeV dark matter (DM). In this work, we investigate the prospects for light DM direct detection through the DM-nucleus Migdal effect in the DARKSPHERE detector. We consider the different DM velocity distributions and momentum-transfer effects. For Xenon and Neon targets, we find that the DM mass $m_{DM}$ can be probed down to as low as $m_{DM} \sim \mathcal{O}$(10) MeV, and the derived bounds on the DM-nucleus scattering cross section $\bar{\sigma}_{n}$ are sensitive to the high-velocity tails of the DM velocity distribution, which can be altered by orders of magnitude for the different DM velocity distributions in the region $m_{DM} < 10$ MeV. |
1601.01454 | Paolo Castorina | P.Castorina and H.Satz | Strangeness Production in AA and pp Collisions | 6 pages, 7 figures | null | 10.1140/epja/i2016-16200-5 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Boost-invariant hadron production in high energy collisions occurs in
causally disconnected regions of finite space-time size. As a result, globally
conserved quantum numbers (charge, strangeness, baryon number) are conserved
locally in spatially restricted correlation clusters. Their size is determined
by two time scales: the equilibration time specifying the formation of a
quark-gluon plasma, and the hadronization time, specifying the onset of
confinement. The expected values for these scales provide the theoretical basis
for the suppression observed for strangeness production in elementary
interactions ($pp$, $e^+e^-$) below LHC energies. In contrast, the space-time
superposition of individual collisions in high energy heavy ion interactions
leads to higher energy densities, resulting in much later hadronization and
hence much larger hadronization volumes. This largely removes the causality
constraints and results in an ideal hadronic resonance gas in full chemical
equilibrium. In the present paper, we determine the collision energies needed
for that; we also estimate when $pp$ collisions reach comparable hadronization
volumes and thus determine when strangeness suppression should disappear there
as well.
| [
{
"created": "Thu, 7 Jan 2016 09:27:30 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Castorina",
"P.",
""
],
[
"Satz",
"H.",
""
]
] | Boost-invariant hadron production in high energy collisions occurs in causally disconnected regions of finite space-time size. As a result, globally conserved quantum numbers (charge, strangeness, baryon number) are conserved locally in spatially restricted correlation clusters. Their size is determined by two time scales: the equilibration time specifying the formation of a quark-gluon plasma, and the hadronization time, specifying the onset of confinement. The expected values for these scales provide the theoretical basis for the suppression observed for strangeness production in elementary interactions ($pp$, $e^+e^-$) below LHC energies. In contrast, the space-time superposition of individual collisions in high energy heavy ion interactions leads to higher energy densities, resulting in much later hadronization and hence much larger hadronization volumes. This largely removes the causality constraints and results in an ideal hadronic resonance gas in full chemical equilibrium. In the present paper, we determine the collision energies needed for that; we also estimate when $pp$ collisions reach comparable hadronization volumes and thus determine when strangeness suppression should disappear there as well. |
hep-ph/0210016 | Dominik Stockinger | Wolfgang Hollik, Elisabeth Kraus, Markus Roth, Christian Rupp, Klaus
Sibold, Dominik St\"ockinger | Renormalization of the Minimal Supersymmetric Standard Model | Talk given by D.S. at the RADCOR/Loops and Legs in Quantum Field
Theory 2002, September 8--13, Kloster Banz, Germany. 5 pages. Layout improved | Nucl.Phys.Proc.Suppl. 116 (2003) 397-401 | 10.1016/S0920-5632(03)80207-4 | DESY-02-162 | hep-ph | null | The renormalization of the Minimal Supersymmetric Standard Model (MSSM) is
presented. We describe symmetry identities that constitute a framework in which
the MSSM is completely characterized and renormalizability can be proven.
Furthermore, we discuss applications of this framework for the determination of
symmetry-restoring counterterms, the gauge dependence of tan(beta) and the
derivation of non-renormalization theorems.
| [
{
"created": "Tue, 1 Oct 2002 12:21:28 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2002 12:12:29 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Hollik",
"Wolfgang",
""
],
[
"Kraus",
"Elisabeth",
""
],
[
"Roth",
"Markus",
""
],
[
"Rupp",
"Christian",
""
],
[
"Sibold",
"Klaus",
""
],
[
"Stöckinger",
"Dominik",
""
]
] | The renormalization of the Minimal Supersymmetric Standard Model (MSSM) is presented. We describe symmetry identities that constitute a framework in which the MSSM is completely characterized and renormalizability can be proven. Furthermore, we discuss applications of this framework for the determination of symmetry-restoring counterterms, the gauge dependence of tan(beta) and the derivation of non-renormalization theorems. |
hep-ph/0409055 | Nobuyuki Sawado | S.Nagai, N.Sawado, and N.Shiiki | Quantization of the chiral soliton in medium | 9 pages, 9 figures | Phys.Lett. B632 (2006) 644-651 | 10.1016/j.physletb.2005.11.014 | null | hep-ph | null | Chiral solitons coupled with quarks in medium are studied based on the
Wigner-Seitz approximation. The chiral quark soliton model is used to obtain
the classical soliton solutions. To investigate nucleon and $\Delta$ in matter,
the semi-classical quantization is performed by the cranking method. The
saturation for nucleon matter and $\Delta$ matter are observed.
| [
{
"created": "Mon, 6 Sep 2004 11:16:37 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2005 00:28:22 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Nagai",
"S.",
""
],
[
"Sawado",
"N.",
""
],
[
"Shiiki",
"N.",
""
]
] | Chiral solitons coupled with quarks in medium are studied based on the Wigner-Seitz approximation. The chiral quark soliton model is used to obtain the classical soliton solutions. To investigate nucleon and $\Delta$ in matter, the semi-classical quantization is performed by the cranking method. The saturation for nucleon matter and $\Delta$ matter are observed. |
2106.00979 | Bibhabasu De | Bibhabasu De (IOP Bhubaneswar), Debottam Das (IOP Bhubaneswar),
Manimala Mitra (IOP Bhubaneswar) and Nirakar Sahoo (Utkal University) | Magnetic Moments of Leptons, Charged Lepton Flavor Violations and Dark
Matter Phenomenology of a Minimal Radiative Dirac Neutrino Mass Model | 61 pages, 18 figures, 7 tables (published version) | JHEP08(2022)202 | 10.1007/JHEP08(2022)202 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a simple extension of the standard model (SM), a pair of vector like
lepton doublets ($L_1$ and $L_2$) and a $SU(2)_L$ scalar doublet ($\eta$) have
been introduced to help in accommodating the discrepancy in determination of
the anomalous magnetic moments of the light leptons, namely, $e$ and $\mu$.
Moreover, to make our scenario friendly to a Dirac like neutrino and also for a
consistent dark matter phenomenology, we specifically add a singlet scalar
($S$) and a singlet fermion ($\psi$) in the set-up. However, the singlet states
also induce a meaningful contribution in other charged lepton processes. A
discrete symmetry $\mathcal {Z}_2 \times \mathcal {Z}_2^\prime$ has been
imposed under which all the SM particles are even while the new particles may
be assumed to have odd charges. In a bottom-up approach, with a minimal
particle content, we systematically explore the available parameter space in
terms of couplings and masses of the new particles. Here a number of
observables associated with the SM leptons have been considered, e.g., masses
and mixings of neutrinos, $(g-2)$ anomalies of $e$, $\mu$, charged lepton
flavor violating (cLFV) observables and the dark matter (DM) phenomenology of a
singlet-doublet dark matter. Neutrinos, promoted as the Dirac type states,
acquire mass at one loop level after the discrete $\mathcal{Z}_2^\prime$
symmetry gets softly broken, while the unbroken $\mathcal{Z}_2$ keeps the dark
matter stable. The mixing between the singlet $\psi$ and the doublet vector
lepton can be constrained to satisfy the electroweak precision observables and
the spin independent (SI) direct detection (DD) cross section of the dark
matter. In this analysis, potentially important LHC bounds have also been
discussed.
| [
{
"created": "Wed, 2 Jun 2021 06:50:40 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Mar 2022 05:18:29 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Aug 2022 15:35:00 GMT",
"version": "v3"
}
] | 2022-08-29 | [
[
"De",
"Bibhabasu",
"",
"IOP Bhubaneswar"
],
[
"Das",
"Debottam",
"",
"IOP Bhubaneswar"
],
[
"Mitra",
"Manimala",
"",
"IOP Bhubaneswar"
],
[
"Sahoo",
"Nirakar",
"",
"Utkal University"
]
] | In a simple extension of the standard model (SM), a pair of vector like lepton doublets ($L_1$ and $L_2$) and a $SU(2)_L$ scalar doublet ($\eta$) have been introduced to help in accommodating the discrepancy in determination of the anomalous magnetic moments of the light leptons, namely, $e$ and $\mu$. Moreover, to make our scenario friendly to a Dirac like neutrino and also for a consistent dark matter phenomenology, we specifically add a singlet scalar ($S$) and a singlet fermion ($\psi$) in the set-up. However, the singlet states also induce a meaningful contribution in other charged lepton processes. A discrete symmetry $\mathcal {Z}_2 \times \mathcal {Z}_2^\prime$ has been imposed under which all the SM particles are even while the new particles may be assumed to have odd charges. In a bottom-up approach, with a minimal particle content, we systematically explore the available parameter space in terms of couplings and masses of the new particles. Here a number of observables associated with the SM leptons have been considered, e.g., masses and mixings of neutrinos, $(g-2)$ anomalies of $e$, $\mu$, charged lepton flavor violating (cLFV) observables and the dark matter (DM) phenomenology of a singlet-doublet dark matter. Neutrinos, promoted as the Dirac type states, acquire mass at one loop level after the discrete $\mathcal{Z}_2^\prime$ symmetry gets softly broken, while the unbroken $\mathcal{Z}_2$ keeps the dark matter stable. The mixing between the singlet $\psi$ and the doublet vector lepton can be constrained to satisfy the electroweak precision observables and the spin independent (SI) direct detection (DD) cross section of the dark matter. In this analysis, potentially important LHC bounds have also been discussed. |
2306.15449 | Per Grafstrom | Per Grafstrom | The total cross section for proton-proton interactions at the FCC | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The lower and upper limits of the total cross section ($\sigma_{tot}$) at the
projected FCC-hh have been estimated. A lower limit has been estimated using
dispersion relations in combination with recent LHC data of $\sigma_{tot}$ and
the $\rho$-parameter. The upper limit has been estimated using the standard
$ln^{2}(s) $ evolution of $\sigma_{tot}$. Some models giving values in between
those limits are also discussed.
| [
{
"created": "Tue, 27 Jun 2023 13:09:33 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Grafstrom",
"Per",
""
]
] | The lower and upper limits of the total cross section ($\sigma_{tot}$) at the projected FCC-hh have been estimated. A lower limit has been estimated using dispersion relations in combination with recent LHC data of $\sigma_{tot}$ and the $\rho$-parameter. The upper limit has been estimated using the standard $ln^{2}(s) $ evolution of $\sigma_{tot}$. Some models giving values in between those limits are also discussed. |
1506.00531 | Yu. A. Simonov | Yu. A. Simonov (Institute of Theoretical and Experimental Physics,
Moscow, Russia) | Nonperturbative approach to the parton model | 30 pages,5 figures;new equations added | null | 10.1142/S0217751X16500160 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nonperturbative parton distributions, obtained from the Lorentz
contracted wave functions, are analyzed in the formalism of many-particle Fock
components and their properties are compared to the standard perturbative
distributions. We show that the collinear and IR divergencies specific for
perturbative evolution treatment are absent in the nonperturbative version,
however for large momenta< $ \vep^2_i \gg \sigma$ (string tension), the
bremsstrahlung kinematics is restored. A preliminary discussion of possible
nonperturbative effects in DIS and high energy scattering is given, including
in particular a possible role of multihybrid states in creating ridge-type
effects.
| [
{
"created": "Mon, 1 Jun 2015 15:22:54 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jan 2016 09:57:22 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Simonov",
"Yu. A.",
"",
"Institute of Theoretical and Experimental Physics,\n Moscow, Russia"
]
] | The nonperturbative parton distributions, obtained from the Lorentz contracted wave functions, are analyzed in the formalism of many-particle Fock components and their properties are compared to the standard perturbative distributions. We show that the collinear and IR divergencies specific for perturbative evolution treatment are absent in the nonperturbative version, however for large momenta< $ \vep^2_i \gg \sigma$ (string tension), the bremsstrahlung kinematics is restored. A preliminary discussion of possible nonperturbative effects in DIS and high energy scattering is given, including in particular a possible role of multihybrid states in creating ridge-type effects. |
hep-ph/9709469 | Willy van Neerven | W.L. van Neerven | Heavy flavour contributions to the spin structure function g_1(x,Q^2)
and the Bjorken sum rule | 10 pages LaTex, 3 Postscript figures, To appear in Nucl. Phys. B
(Suppl.) | null | null | null | hep-ph | null | We discuss the order alpha_s^2 corrections to the longitudinal spin structure
function g_1(x,Q^2,m^2) which are due to heavy flavour contributions. Here Q
denotes the virtuality of the photon and m stands for the heavy flavour mass.
Since the exact heavy quark coefficient functions are not known yet we have
used the asymptotic forms which are strictly speaking only valid in the region
Q^2 >> m^2. However an analysis of the exact and asymptotic expressions for
F_2^{NLO}(x,Q^2,m^2) and g_1^{LO}(x,Q^2,m^2) reveals that the asymptotic forms
can be also used at smaller Q^2. It appears that for the region 0.01 < x < 0.1
the NLO charm quark component can become twice as large as in LO. However it is
still much smaller than g_1(x,Q^2) due to light parton contributions. This is
in contrast to the observations made for F_2(x,Q^2) at small x. Also the charm
quark contribution to the Bjorken sum rule turns out to be very small.
| [
{
"created": "Fri, 26 Sep 1997 13:52:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"van Neerven",
"W. L.",
""
]
] | We discuss the order alpha_s^2 corrections to the longitudinal spin structure function g_1(x,Q^2,m^2) which are due to heavy flavour contributions. Here Q denotes the virtuality of the photon and m stands for the heavy flavour mass. Since the exact heavy quark coefficient functions are not known yet we have used the asymptotic forms which are strictly speaking only valid in the region Q^2 >> m^2. However an analysis of the exact and asymptotic expressions for F_2^{NLO}(x,Q^2,m^2) and g_1^{LO}(x,Q^2,m^2) reveals that the asymptotic forms can be also used at smaller Q^2. It appears that for the region 0.01 < x < 0.1 the NLO charm quark component can become twice as large as in LO. However it is still much smaller than g_1(x,Q^2) due to light parton contributions. This is in contrast to the observations made for F_2(x,Q^2) at small x. Also the charm quark contribution to the Bjorken sum rule turns out to be very small. |
0910.5420 | Dennis Sivers Dr. | Dennis Sivers | The Fractured Boer-Mulders Effect in the Production of Polarized Baryons | 19 pages 3 tables and 8 figures | Phys.Rev.D81:034029,2010 | 10.1103/PhysRevD.81.034029 | PPI 0912 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fractured Boer-Mulders functions describe an inriguing class of
polarization effects for the production of baryons in the target fragmentation
region of deep-inelastic processes. These functions characterize transverse
momentum asymmetries related to the spin orientation for different flavors of
axial vector diquarks in an unpolarized ensemble of protons just as the
familiar Boer-Mulders functions characterize transverse momentum asymmetries
connected to the spin orientation of quarks in unpolarized targets. The
asymmetries of the fractured Boer-Mulders effect originating in the proton
distribution function can be separated kinematically, both in SIDIS and in the
Drell-Yan process from the asymmetries of the polarizing fracture functions
generated during the soft color rearrangement of the fragmentation process. The
experimental requirements for this separation are presented in this article and
it is shown that the fractured Boer-Mulders effect should change sign between
Drell-Yan and SIDIS while the polarizing fracture functions remain the same.
Simple isospin arguments indicate the two polarization mechanisms should give
significantly different results for the production of polarized lambdas and
sigmas.
| [
{
"created": "Wed, 28 Oct 2009 16:35:14 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Sivers",
"Dennis",
""
]
] | The fractured Boer-Mulders functions describe an inriguing class of polarization effects for the production of baryons in the target fragmentation region of deep-inelastic processes. These functions characterize transverse momentum asymmetries related to the spin orientation for different flavors of axial vector diquarks in an unpolarized ensemble of protons just as the familiar Boer-Mulders functions characterize transverse momentum asymmetries connected to the spin orientation of quarks in unpolarized targets. The asymmetries of the fractured Boer-Mulders effect originating in the proton distribution function can be separated kinematically, both in SIDIS and in the Drell-Yan process from the asymmetries of the polarizing fracture functions generated during the soft color rearrangement of the fragmentation process. The experimental requirements for this separation are presented in this article and it is shown that the fractured Boer-Mulders effect should change sign between Drell-Yan and SIDIS while the polarizing fracture functions remain the same. Simple isospin arguments indicate the two polarization mechanisms should give significantly different results for the production of polarized lambdas and sigmas. |
1608.00765 | David Heymes | Michal Czakon, David Heymes and Alexander Mitov | Bump-hunting in LHC ttbar events | 8 pages, 6 figures, analytic fits attached, plot on top-mass
sensitivity for the invariant mass distribution added, appendix on top-mass
sensitivity of differential distributions added, minor additional changes and
comments, matches published version | Phys. Rev. D 94, 114033 (2016) | 10.1103/PhysRevD.94.114033 | Cavendish-HEP-16/14, TTK-16-33 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that a purposefully normalised NNLO top pair invariant mass
differential spectrum can have very small theoretical uncertainty and, in
particular, a small sensitivity to the top quark mass. Such observable can thus
be a very effective bump-hunting tool for resonances decaying to top pair
events during LHC Run II and beyond. To illustrate how the approach works, we
concentrate on one specific example of current interest, namely, the possible
750 GeV di-gamma excess resonance Phi. Considering only theoretical
uncertainties, we demonstrate that it is possible to distinguish pp -> Phi ->
tt signals studied in the recent literature [Hespel, Maltoni and Vryonidou,
arXiv:1606.04149] from the pure SM background with very high significance.
Alternatively, in case of non-observation, a strong upper limit on the decay
rate Phi -> tt can be placed.
| [
{
"created": "Tue, 2 Aug 2016 11:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jan 2017 08:44:44 GMT",
"version": "v2"
}
] | 2017-01-13 | [
[
"Czakon",
"Michal",
""
],
[
"Heymes",
"David",
""
],
[
"Mitov",
"Alexander",
""
]
] | We demonstrate that a purposefully normalised NNLO top pair invariant mass differential spectrum can have very small theoretical uncertainty and, in particular, a small sensitivity to the top quark mass. Such observable can thus be a very effective bump-hunting tool for resonances decaying to top pair events during LHC Run II and beyond. To illustrate how the approach works, we concentrate on one specific example of current interest, namely, the possible 750 GeV di-gamma excess resonance Phi. Considering only theoretical uncertainties, we demonstrate that it is possible to distinguish pp -> Phi -> tt signals studied in the recent literature [Hespel, Maltoni and Vryonidou, arXiv:1606.04149] from the pure SM background with very high significance. Alternatively, in case of non-observation, a strong upper limit on the decay rate Phi -> tt can be placed. |
hep-ph/0112197 | Marek Gazdzicki | M. I. Gorenstein, K. A. Bugaev and M. Gazdzicki | Omega, J/psi and psi' Production in Nuclear Collisions and Quark Gluon
Plsama Hadronization | Revised version to appear in Phys. Rev. Lett | Phys.Rev.Lett. 88 (2002) 132301 | 10.1103/PhysRevLett.88.132301 | null | hep-ph | null | The transverse mass spectra of Omega, J/psi and psi' in Pb+Pb collisions at
158 AGeV are studied within a hydrodynamical model of the quark gluon plasma
expansion and hadronization. The model reproduces the existing data with the
common hadronization parameters: temperature T=T_H = 170 MeV and average
collective transverse velocity v_T = 0.2.
| [
{
"created": "Fri, 14 Dec 2001 15:36:20 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 2002 11:56:28 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Gorenstein",
"M. I.",
""
],
[
"Bugaev",
"K. A.",
""
],
[
"Gazdzicki",
"M.",
""
]
] | The transverse mass spectra of Omega, J/psi and psi' in Pb+Pb collisions at 158 AGeV are studied within a hydrodynamical model of the quark gluon plasma expansion and hadronization. The model reproduces the existing data with the common hadronization parameters: temperature T=T_H = 170 MeV and average collective transverse velocity v_T = 0.2. |
hep-ph/0110175 | Josephine Bolosan | S. Pakvasa | CPT and Lorentz Violations in Neutrino Oscillations | References added and typos corrected, 8 pages, 1 figure, latex209.
Presented at the Second Meeting on CPT and Lorentz Symmetry CPT'01, August
15-18, 2001, Bloomington, Indiana | null | 10.1142/9789812778123_0023 | UH-511-992-01 | hep-ph hep-ex | null | Tests of Lorentz invariance violation and CPT Violation in neutrino
oscillations are discussed. The sensitivity of current and future experiments
is presented.
| [
{
"created": "Sat, 13 Oct 2001 01:07:32 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Oct 2001 01:55:58 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Pakvasa",
"S.",
""
]
] | Tests of Lorentz invariance violation and CPT Violation in neutrino oscillations are discussed. The sensitivity of current and future experiments is presented. |
hep-ph/0108244 | Fumihiro Takayama | F. Borzumati, R.M. Godbole, J.L. Kneur, and F. Takayama | Lightest-neutralino decays in R_p-violating models with dominant
lambda^{prime} and lambda couplings | 40 pages, 11 figures, version to appear in JHEP | JHEP 0207 (2002) 037 | 10.1088/1126-6708/2002/07/037 | RESCEU-UT-3/01,SISSA 26/01/EP,IISc-CTS/12/01,PM/01-22,TU-621 | hep-ph | null | Decays of the lightest neutralino are studied in R_p-violating models with
operators lambda^{prime} L Q D^c and lambda L L E^c involving third-generation
matter fields and with dominant lambda^{prime} and lambda couplings.
Generalizations to decays of the lightest neutralino induced by subdominant
lambda^{prime} and lambda couplings are straightforward. Decays with the
top-quark among the particles produced are considered, in addition to those
with an almost massless final state. Phenomenological analyses for examples of
both classes of decays are presented. No specific assumption on the composition
of the lightest neutralino is made, and the formulae listed here can be easily
generalized to study decays of heavier neutralinos. It has been recently
pointed out that, for a sizable coupling lambda^{prime}_{333}, tau-sleptons may
be copiously produced at the LHC as single supersymmetric particles, in
association with top- and bottom-quark pairs. This analysis of neutralino
decays is, therefore, a first step towards the reconstruction of the complete
final state produced in this case.
| [
{
"created": "Wed, 29 Aug 2001 19:35:39 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Oct 2001 08:48:57 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Aug 2002 03:51:22 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Borzumati",
"F.",
""
],
[
"Godbole",
"R. M.",
""
],
[
"Kneur",
"J. L.",
""
],
[
"Takayama",
"F.",
""
]
] | Decays of the lightest neutralino are studied in R_p-violating models with operators lambda^{prime} L Q D^c and lambda L L E^c involving third-generation matter fields and with dominant lambda^{prime} and lambda couplings. Generalizations to decays of the lightest neutralino induced by subdominant lambda^{prime} and lambda couplings are straightforward. Decays with the top-quark among the particles produced are considered, in addition to those with an almost massless final state. Phenomenological analyses for examples of both classes of decays are presented. No specific assumption on the composition of the lightest neutralino is made, and the formulae listed here can be easily generalized to study decays of heavier neutralinos. It has been recently pointed out that, for a sizable coupling lambda^{prime}_{333}, tau-sleptons may be copiously produced at the LHC as single supersymmetric particles, in association with top- and bottom-quark pairs. This analysis of neutralino decays is, therefore, a first step towards the reconstruction of the complete final state produced in this case. |
1307.1546 | Jussi Virkaj\"arvi | Kimmo Kainulainen, Kimmo Tuominen, Jussi Virkaj\"arvi | Dark matter from unification | 30 pages, 7 figures | null | 10.1088/1475-7516/2013/10/036 | CP3-Origins-2013-026 DNRF90, DIAS-2013-26 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a minimal extension of the Standard Model (SM), which leads to
unification of the SM coupling constants, breaks electroweak symmetry
dynamically by a new strongly coupled sector and leads to novel dark matter
candidates. In this model, the coupling constant unification requires the
existence of electroweak triplet and doublet fermions singlet under QCD and new
strong dynamics underlying the Higgs sector. Among these new matter fields and
a new right handed neutrino, we consider the mass and mixing patterns of the
neutral states. We argue for a symmetry stabilizing the lightest mass
eigenstates of this sector and determine the resulting relic density. The
results are constrained by available data from colliders and direct and
indirect dark matter experiments. We find the model viable and outline briefly
future research directions.
| [
{
"created": "Fri, 5 Jul 2013 08:35:25 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Kainulainen",
"Kimmo",
""
],
[
"Tuominen",
"Kimmo",
""
],
[
"Virkajärvi",
"Jussi",
""
]
] | We consider a minimal extension of the Standard Model (SM), which leads to unification of the SM coupling constants, breaks electroweak symmetry dynamically by a new strongly coupled sector and leads to novel dark matter candidates. In this model, the coupling constant unification requires the existence of electroweak triplet and doublet fermions singlet under QCD and new strong dynamics underlying the Higgs sector. Among these new matter fields and a new right handed neutrino, we consider the mass and mixing patterns of the neutral states. We argue for a symmetry stabilizing the lightest mass eigenstates of this sector and determine the resulting relic density. The results are constrained by available data from colliders and direct and indirect dark matter experiments. We find the model viable and outline briefly future research directions. |
hep-ph/0510300 | Bumseok Kyae | Bumseok Kyae, and Qaisar Shafi | Inflation With A Realistic SO(10) Model | 4 pages. Talk presented by B. Kyae at PASCOS'05, Gyeongju, Korea (May
30 - June 4, 2005), at PPP'05, YITP, Kyoto, Japan (June 20-24, 2005), and at
COSMO'05, Bonn, Germany (Aug. 28 - Sept. 1, 2005) | AIP Conf.Proc.805:439-442,2006 | 10.1063/1.2149750 | null | hep-ph | null | We implement inflation within a realistic supersymmetric SO(10) model in
which the doublet-triplet splitting is realized through the Dimopoulos-Wilczek
mechanism, the MSSM $\mu$ problem is resolved, and higgsino mediated dimension
five nucleon decay is heavily suppressed. The cosmologically unwanted
topological defects are inflated away, and from $\delta T/ T$, the $B-L$
breaking scale is estimated to be of order $10^{16}-10^{17}$ GeV. Including
supergravity corrections, the scalar spectral index $n_s = 0.99\pm 0.01$, with
$|dn_s/ d{\rm ln}k| \lapproxeq 10^{-3}$.
| [
{
"created": "Mon, 24 Oct 2005 02:54:16 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Kyae",
"Bumseok",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We implement inflation within a realistic supersymmetric SO(10) model in which the doublet-triplet splitting is realized through the Dimopoulos-Wilczek mechanism, the MSSM $\mu$ problem is resolved, and higgsino mediated dimension five nucleon decay is heavily suppressed. The cosmologically unwanted topological defects are inflated away, and from $\delta T/ T$, the $B-L$ breaking scale is estimated to be of order $10^{16}-10^{17}$ GeV. Including supergravity corrections, the scalar spectral index $n_s = 0.99\pm 0.01$, with $|dn_s/ d{\rm ln}k| \lapproxeq 10^{-3}$. |
hep-ph/0607127 | Tania Robens | W. Kilian, J. Reuter, T. Robens | NLO Event Generation for Chargino Production at the ILC | 23 pages, version to appear in Eur.Phys.Jour.C | Eur.Phys.J.C48:389-400,2006 | 10.1140/epjc/s10052-006-0048-y | DESY 06-103, SI-HEP-2006-07 | hep-ph | null | We present a Monte-Carlo event generator for simulating chargino
pair-production at the International Linear Collider (ILC) at next-to-leading
order in the electroweak couplings. By properly resumming photons in the soft
and collinear regions, we avoid negative event weights, so the program can
simulate physical (unweighted) event samples. Photons are explicitly generated
throughout the range where they can be experimentally resolved. Inspecting the
dependence on the cutoffs separating the soft and collinear regions, we
evaluate the systematic errors due to soft and collinear approximations. In the
resummation approach, the residual uncertainty can be brought down to the
per-mil level, coinciding with the expected statistical uncertainty at the ILC.
| [
{
"created": "Tue, 11 Jul 2006 18:10:46 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Oct 2006 14:11:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kilian",
"W.",
""
],
[
"Reuter",
"J.",
""
],
[
"Robens",
"T.",
""
]
] | We present a Monte-Carlo event generator for simulating chargino pair-production at the International Linear Collider (ILC) at next-to-leading order in the electroweak couplings. By properly resumming photons in the soft and collinear regions, we avoid negative event weights, so the program can simulate physical (unweighted) event samples. Photons are explicitly generated throughout the range where they can be experimentally resolved. Inspecting the dependence on the cutoffs separating the soft and collinear regions, we evaluate the systematic errors due to soft and collinear approximations. In the resummation approach, the residual uncertainty can be brought down to the per-mil level, coinciding with the expected statistical uncertainty at the ILC. |
1701.06793 | Tom\'a\v{s} Brauner | Tomas Brauner and Saurabh Kadam | Anomalous electrodynamics of neutral pion matter in strong magnetic
fields | 1+22 pages | JHEP 03 (2017) 015 | 10.1007/JHEP03(2017)015 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ground state of quantum chromodynamics in sufficiently strong external
magnetic fields and at moderate baryon chemical potential is a chiral soliton
lattice (CSL) of neutral pions. We investigate the interplay between the CSL
structure and dynamical electromagnetic fields. Our main result is that in
presence of the CSL background, the two physical photon polarizations and the
neutral pion mix, giving rise to two gapped excitations and one gapless mode
with a nonrelativistic dispersion relation. The nature of this mode depends on
the direction of its propagation, interpolating between a circularly polarized
electromagnetic wave and a neutral pion surface wave, which in turn arises from
the spontaneously broken translation invariance. Quite remarkably, there is a
neutral-pion-like mode that remains gapped even in the chiral limit, in seeming
contradiction to the Goldstone theorem. Finally, we have a first look at the
effect of thermal fluctuations of the CSL, showing that even the soft
nonrelativistic excitation does not lead to the Landau-Peierls instability.
However, it leads to an anomalous contribution to pressure that scales with
temperature and magnetic field as $T^{5/2}(B/f_\pi)^{3/2}$.
| [
{
"created": "Tue, 24 Jan 2017 10:17:22 GMT",
"version": "v1"
}
] | 2017-03-07 | [
[
"Brauner",
"Tomas",
""
],
[
"Kadam",
"Saurabh",
""
]
] | The ground state of quantum chromodynamics in sufficiently strong external magnetic fields and at moderate baryon chemical potential is a chiral soliton lattice (CSL) of neutral pions. We investigate the interplay between the CSL structure and dynamical electromagnetic fields. Our main result is that in presence of the CSL background, the two physical photon polarizations and the neutral pion mix, giving rise to two gapped excitations and one gapless mode with a nonrelativistic dispersion relation. The nature of this mode depends on the direction of its propagation, interpolating between a circularly polarized electromagnetic wave and a neutral pion surface wave, which in turn arises from the spontaneously broken translation invariance. Quite remarkably, there is a neutral-pion-like mode that remains gapped even in the chiral limit, in seeming contradiction to the Goldstone theorem. Finally, we have a first look at the effect of thermal fluctuations of the CSL, showing that even the soft nonrelativistic excitation does not lead to the Landau-Peierls instability. However, it leads to an anomalous contribution to pressure that scales with temperature and magnetic field as $T^{5/2}(B/f_\pi)^{3/2}$. |
2208.09405 | Supritha Bhowmick | Debjyoti Bardhan, Supritha Bhowmick, Diptimoy Ghosh, Atanu Guha, Divya
Sachdeva | Bounds on boosted dark matter from direct detection: The role of
energy-dependent cross sections | 11 pages, 3 figures; Title modified | Phys.Rev.D 107 (2023) 1, 015010 | 10.1103/PhysRevD.107.015010 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The recoil threshold of Direct Detection experiments limits the mass range of
Dark Matter (DM) particles that can be detected, with most DD experiments being
blind to sub-MeV DM particles. However, these light DM particles can be boosted
to very high energies via collisions with energetic Cosmic Ray electrons. This
allows Dark Matter particles to induce detectable recoil in the target of
Direct Detection experiments. We derive constraints on scattering cross section
of DM and electron, using XENONnT and Super-Kamiokande data. Vector and scalar
mediators are considered, in the heavy and light regimes. We discuss the
importance of including energy dependent cross sections (due to specific
Lorentz structure of the vertex) in our analysis, and show that the bounds can
be significantly different than the results obtained assuming constant
energy-independent cross-section, often assumed in the literature for
simplicity. Our bounds are also compared with other astrophysical and
cosmological constraints.
| [
{
"created": "Fri, 19 Aug 2022 15:47:20 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Sep 2022 13:38:24 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Nov 2022 12:39:26 GMT",
"version": "v3"
},
{
"created": "Fri, 13 Jan 2023 12:39:02 GMT",
"version": "v4"
}
] | 2023-01-17 | [
[
"Bardhan",
"Debjyoti",
""
],
[
"Bhowmick",
"Supritha",
""
],
[
"Ghosh",
"Diptimoy",
""
],
[
"Guha",
"Atanu",
""
],
[
"Sachdeva",
"Divya",
""
]
] | The recoil threshold of Direct Detection experiments limits the mass range of Dark Matter (DM) particles that can be detected, with most DD experiments being blind to sub-MeV DM particles. However, these light DM particles can be boosted to very high energies via collisions with energetic Cosmic Ray electrons. This allows Dark Matter particles to induce detectable recoil in the target of Direct Detection experiments. We derive constraints on scattering cross section of DM and electron, using XENONnT and Super-Kamiokande data. Vector and scalar mediators are considered, in the heavy and light regimes. We discuss the importance of including energy dependent cross sections (due to specific Lorentz structure of the vertex) in our analysis, and show that the bounds can be significantly different than the results obtained assuming constant energy-independent cross-section, often assumed in the literature for simplicity. Our bounds are also compared with other astrophysical and cosmological constraints. |
hep-ph/0611231 | Ulf-G. Mei{\ss}ner | V\'eronique Bernard, Ulf-G. Mei{\ss}ner | Chiral perturbation theory | Commissioned article for Ann. Rev. Nucl. Part. Sci., 27 pp, 7 figs | Ann.Rev.Nucl.Part.Sci.57:33-60,2007 | 10.1146/annurev.nucl.56.080805.140449 | HISKP-TH-06/36 | hep-ph hep-ex hep-lat nucl-th | null | We give a brief introduction to chiral perturbation theory in its various
settings. We discuss some applications of recent interest including chiral
extrapolations for lattice gauge theory.
| [
{
"created": "Fri, 17 Nov 2006 10:23:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bernard",
"Véronique",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We give a brief introduction to chiral perturbation theory in its various settings. We discuss some applications of recent interest including chiral extrapolations for lattice gauge theory. |
hep-ph/0210371 | D'Alesio Umberto | M. Anselmino (1), U. D'Alesio (2), F. Murgia (2) ((1) University and
INFN, Torino, Italy, (2) University and INFN, Cagliari, Italy) | Transverse single spin asymmetries in Drell-Yan processes | LaTeX, 24+1 pages, 7 ps figures, uses epsfig.sty | Phys.Rev. D67 (2003) 074010 | 10.1103/PhysRevD.67.074010 | INFNCA-TH0208 | hep-ph | null | Recently, it has been shown, contrary to previous beliefs, that the k_T
distribution of quarks in a transversely polarized proton can be asymmetric.
This ``Sivers effect'' had already been used to explain transverse single spin
asymmetries (SSA) observed in inclusive pion production, p(transv. polarized) p
--> pion + X and p-bar(transv. polarized) p --> pion + X. In such channels,
however, other mechanisms, like the ``Collins effect'' (a k_T asymmetric
fragmentation of a transversely polarized quark into pions), may generate SSA.
The Sivers asymmetry is used here to compute SSA in Drell-Yan processes; in
this case, by considering the differential cross-section in the lepton-pair
invariant mass, rapidity and transverse momentum, other mechanisms which may
originate SSA cannot contribute. Estimates for RHIC experiments are given.
| [
{
"created": "Mon, 28 Oct 2002 08:55:01 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Anselmino",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Murgia",
"F.",
""
]
] | Recently, it has been shown, contrary to previous beliefs, that the k_T distribution of quarks in a transversely polarized proton can be asymmetric. This ``Sivers effect'' had already been used to explain transverse single spin asymmetries (SSA) observed in inclusive pion production, p(transv. polarized) p --> pion + X and p-bar(transv. polarized) p --> pion + X. In such channels, however, other mechanisms, like the ``Collins effect'' (a k_T asymmetric fragmentation of a transversely polarized quark into pions), may generate SSA. The Sivers asymmetry is used here to compute SSA in Drell-Yan processes; in this case, by considering the differential cross-section in the lepton-pair invariant mass, rapidity and transverse momentum, other mechanisms which may originate SSA cannot contribute. Estimates for RHIC experiments are given. |
hep-ph/9312277 | null | M.C. Gonzalez-Garcia, F. Halzen, and R.A. V\'azquez | On the Precision of the Computation of the QCD Corrections to
Electroweak Vacuum Polarizations | (LaTex file with ReVTeX, 4 Figures in Postcript available upon
request) MAD/PH/804 | Phys.Lett.B322:233-238,1994 | 10.1016/0370-2693(94)91113-4 | null | hep-ph | null | We demonstrate that the dispersive computation of the threshold enhancements
to heavy quark vacuum polarizations is unstable. Because of the slow
convergence of the dispersion relations the result critically depends on the
intermediate energy region where the non-relativistic approximation, intrinsic
to threshold calculations, is invalid. We discuss other ambiguities precluding
a reliable calculation of the threshold contribution to the vacuum
polarizations. In the absence of a solution prudence should force one to assign
an error to the radiative corrections not far below the level of the
pertubative O($\alpha \alpha_s$) contributions. This may preclude the
extraction of the Higgs mass from precision measurements.
| [
{
"created": "Tue, 14 Dec 1993 14:33:00 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Halzen",
"F.",
""
],
[
"Vázquez",
"R. A.",
""
]
] | We demonstrate that the dispersive computation of the threshold enhancements to heavy quark vacuum polarizations is unstable. Because of the slow convergence of the dispersion relations the result critically depends on the intermediate energy region where the non-relativistic approximation, intrinsic to threshold calculations, is invalid. We discuss other ambiguities precluding a reliable calculation of the threshold contribution to the vacuum polarizations. In the absence of a solution prudence should force one to assign an error to the radiative corrections not far below the level of the pertubative O($\alpha \alpha_s$) contributions. This may preclude the extraction of the Higgs mass from precision measurements. |
1503.02931 | Peng-fei Yin | Qian-Fei Xiang, Xiao-Jun Bi, Peng-Fei Yin, Zhao-Huan Yu | Searches for dark matter signals in simplified models at future hadron
colliders | 24 papes, 6 figures | Phys. Rev. D 91, 095020 (2015) | 10.1103/PhysRevD.91.095020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the prospect of dark matter (DM) searches in the monojet channel at
future $pp$ colliders with center-of-mass energies of 33, 50, and 100~TeV. We
consider a class of simplified models in which a vector boson connecting DM
particles to quarks is introduced. Comparing with studies in the effective
field theory, the present framework gives more reasonable production rates and
kinematics of the DM signatures. We estimate the sensitivities of future
colliders with an integrated luminosity of 3 $ab^{-1}$ to the DM-induced
monojet signature and show the parameter space that can be explored. The
constraints from direct and indirect DM detection experiments are compared with
the future collider sensitivities. We find that the future collider detection
will be much more sensitive than the indirect detection for the vector
interaction, and have better sensitivities than those of the direct detection
by several orders of magnitude for the axial vector interaction.
| [
{
"created": "Tue, 10 Mar 2015 14:43:46 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Xiang",
"Qian-Fei",
""
],
[
"Bi",
"Xiao-Jun",
""
],
[
"Yin",
"Peng-Fei",
""
],
[
"Yu",
"Zhao-Huan",
""
]
] | We study the prospect of dark matter (DM) searches in the monojet channel at future $pp$ colliders with center-of-mass energies of 33, 50, and 100~TeV. We consider a class of simplified models in which a vector boson connecting DM particles to quarks is introduced. Comparing with studies in the effective field theory, the present framework gives more reasonable production rates and kinematics of the DM signatures. We estimate the sensitivities of future colliders with an integrated luminosity of 3 $ab^{-1}$ to the DM-induced monojet signature and show the parameter space that can be explored. The constraints from direct and indirect DM detection experiments are compared with the future collider sensitivities. We find that the future collider detection will be much more sensitive than the indirect detection for the vector interaction, and have better sensitivities than those of the direct detection by several orders of magnitude for the axial vector interaction. |
hep-ph/9210241 | Satoshi Mizuta | Satoshi Mizuta, Daniel Ng and Masahiro Yamaguchi | Phenomenological Aspects of Supersymmetric Standard Models without Grand
Unification | 15 pages, 8 figures ( not included, but available on request ), in
LaTeX, TU-410, IFP-436-UNC | Phys.Lett. B300 (1993) 96-103 | 10.1016/0370-2693(93)90754-6 | null | hep-ph | null | When the GUT relation on gaugino masses is relaxed, the mass and composition
of the lightest neutralino are different from those in the GUT case. We discuss
its phenomenological implications on the relic abundance of the neutralinos and
on superparticle searches. In particular, we focus on the case where the
neutral component of Winos dominates the lightest neutralino. It turns out the
Wino-LSP is not a candidate for the dark matter.
| [
{
"created": "Fri, 16 Oct 1992 08:00:51 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Mizuta",
"Satoshi",
""
],
[
"Ng",
"Daniel",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | When the GUT relation on gaugino masses is relaxed, the mass and composition of the lightest neutralino are different from those in the GUT case. We discuss its phenomenological implications on the relic abundance of the neutralinos and on superparticle searches. In particular, we focus on the case where the neutral component of Winos dominates the lightest neutralino. It turns out the Wino-LSP is not a candidate for the dark matter. |
1806.00042 | Jordi Garra Tic\'o | Jordi Garra Tic\'o | The hyperbolic rotation group of neutral meson mixing and $CP$ violation | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | Neutral meson mixing and $CP$ violation are very well known weak processes
that involve decays to meson states that are, in general, a superposition of
flavor eigenstates. This paper describes a mathematical interpretation of the
time-dependent mixing amplitudes as a complex hyperbolic rotation of the time
evolution of those amplitudes without mixing, which involves a Lie group
$SO(1,1,\mathbb{C})$.
This allows a geometric interpretation of mixing as a curve into the
$SO(1,1,\mathbb{C})$ manifold, parameterized with the proper decay time, where
$CP$ violation is the image of this curve at $t = 0$.
To show the power of this new interpretation, it is applied to several
aspects of the measurement of the CKM angle $\gamma$ in $B$ decays to neutral
$D$ mesons. On one hand, the charm mixing correction on the $CPV$ parameters is
derived. On the other hand, it is shown how the expressions used in GLW, ADS
and GGSZ methods are affected by charm mixing. Finally, the complete example
with both charm and strange mixing and $CPV$ is described.
| [
{
"created": "Thu, 31 May 2018 18:26:01 GMT",
"version": "v1"
}
] | 2018-06-04 | [
[
"Ticó",
"Jordi Garra",
""
]
] | Neutral meson mixing and $CP$ violation are very well known weak processes that involve decays to meson states that are, in general, a superposition of flavor eigenstates. This paper describes a mathematical interpretation of the time-dependent mixing amplitudes as a complex hyperbolic rotation of the time evolution of those amplitudes without mixing, which involves a Lie group $SO(1,1,\mathbb{C})$. This allows a geometric interpretation of mixing as a curve into the $SO(1,1,\mathbb{C})$ manifold, parameterized with the proper decay time, where $CP$ violation is the image of this curve at $t = 0$. To show the power of this new interpretation, it is applied to several aspects of the measurement of the CKM angle $\gamma$ in $B$ decays to neutral $D$ mesons. On one hand, the charm mixing correction on the $CPV$ parameters is derived. On the other hand, it is shown how the expressions used in GLW, ADS and GGSZ methods are affected by charm mixing. Finally, the complete example with both charm and strange mixing and $CPV$ is described. |
2211.13575 | Kanat Nurlan | Mikhail K. Volkov and K. Nurlan | $\tau$ lepton decays with production of strange scalar mesons
$K^*_0(700)$ and $K^*_0(1430)$ in the extended NJL model | 9 pages, 5 figures | null | 10.1134/S0021364023600106 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The branching fractions of $\tau$ lepton decays with the production of
strange scalar mesons both in the ground and first radially excited states
$\tau \to \nu_\tau [K^*_0(700), K^*_0(1430)]$ and $\tau \to \nu_\tau
[K^*_0(700)\pi, K^*_0(1430)\pi, K^*_0(700) K, K^*_0 (700)\eta]$ are calculated
in the extended $U(3) \times U(3)$ chiral quark NJL model. All mesons are
considered as $q\bar{q}$ systems. The obtained results should be considered as
predictions for future experiments.
| [
{
"created": "Thu, 24 Nov 2022 12:57:30 GMT",
"version": "v1"
}
] | 2023-03-22 | [
[
"Volkov",
"Mikhail K.",
""
],
[
"Nurlan",
"K.",
""
]
] | The branching fractions of $\tau$ lepton decays with the production of strange scalar mesons both in the ground and first radially excited states $\tau \to \nu_\tau [K^*_0(700), K^*_0(1430)]$ and $\tau \to \nu_\tau [K^*_0(700)\pi, K^*_0(1430)\pi, K^*_0(700) K, K^*_0 (700)\eta]$ are calculated in the extended $U(3) \times U(3)$ chiral quark NJL model. All mesons are considered as $q\bar{q}$ systems. The obtained results should be considered as predictions for future experiments. |
1802.05017 | Pere Masjuan | Sergi Gonz\`alez-Sol\'is, Pere Masjuan, Pablo Sanchez-Puertas | Insisting on the role of experimental data: the pseudoscalar-pole piece
to the $(g_\mu-2)$ and the $|V_{ub}|$ from $B \to \pi \ell \nu_{\ell}$
differential branching ratio | Talk given by P.M at the XVII International Conference on Hadron
Spectroscopy and Structure - Hadron2017 held in Salamanca, Spain, 25-29
September, 2017 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ a mathematical framework based on rational approximants in order to
calculate meson form factors. The method profits from unitary, is systematic
and data based, and is able to ascribe a systematic uncertainty which provides
for the desired model independence. Two examples are discussed: the transition
form factor entering the pseudoscalar-pole piece of the hadronic light-by-light
contribution to the anomalous magnetic moment of the muon, and the $B \to \pi$
form factor participating the $B\to\pi\ell\nu_{\ell}$ differential branching
ratios which allows to determine the $|V_{ub}|$ CKM parameter.
| [
{
"created": "Wed, 14 Feb 2018 10:08:12 GMT",
"version": "v1"
}
] | 2018-02-15 | [
[
"Gonzàlez-Solís",
"Sergi",
""
],
[
"Masjuan",
"Pere",
""
],
[
"Sanchez-Puertas",
"Pablo",
""
]
] | We employ a mathematical framework based on rational approximants in order to calculate meson form factors. The method profits from unitary, is systematic and data based, and is able to ascribe a systematic uncertainty which provides for the desired model independence. Two examples are discussed: the transition form factor entering the pseudoscalar-pole piece of the hadronic light-by-light contribution to the anomalous magnetic moment of the muon, and the $B \to \pi$ form factor participating the $B\to\pi\ell\nu_{\ell}$ differential branching ratios which allows to determine the $|V_{ub}|$ CKM parameter. |
1802.07972 | Jean Cleymans | Natasha Sharma, Jean Cleymans, Lokesh Kumar | Thermal Model Description of p--Pb Collisions at $\sqrt{s_{NN}} $ = 5.02
TeV | 10 pages, 12 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ALICE data on light flavor hadron production obtained in $p-Pb$
collisions at $\sqrt{s_{NN}} $ = 5.02 TeV are studied in the thermal model
using the canonical approach with exact strangeness conservation. The chemical
freeze-out temperature is independent of centrality except for the lowest
multiplicity bin, with values close to 160 MeV but consistent with those
obtained in $Pb-Pb$ collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. The value of the
strangeness non-equilibrium factor $\gamma_s$ is slowly increasing with
multiplicity from 0.9 to 0.96, i.e. it is always very close to full chemical
equilibrium.
| [
{
"created": "Thu, 22 Feb 2018 10:32:57 GMT",
"version": "v1"
}
] | 2018-02-26 | [
[
"Sharma",
"Natasha",
""
],
[
"Cleymans",
"Jean",
""
],
[
"Kumar",
"Lokesh",
""
]
] | The ALICE data on light flavor hadron production obtained in $p-Pb$ collisions at $\sqrt{s_{NN}} $ = 5.02 TeV are studied in the thermal model using the canonical approach with exact strangeness conservation. The chemical freeze-out temperature is independent of centrality except for the lowest multiplicity bin, with values close to 160 MeV but consistent with those obtained in $Pb-Pb$ collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. The value of the strangeness non-equilibrium factor $\gamma_s$ is slowly increasing with multiplicity from 0.9 to 0.96, i.e. it is always very close to full chemical equilibrium. |
1805.03436 | Kamil Serafin | Kamil Serafin, Mar\'ia G\'omez-Rocha, Jai More, Stanis{\l}aw D.
G{\l}azek | Approximate Hamiltonian for baryons in heavy-flavor QCD | Post-peer-review, pre-copyedit version of an article published in The
European Physical Journal C, 35 pages, 7 figures | Eur. Phys. J. C (2018) 78: 964 | 10.1140/epjc/s10052-018-6436-2 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Aiming at relativistic description of gluons in hadrons, the renormalization
group procedure for effective particles (RGPEP) is applied to baryons in QCD of
heavy quarks. The baryon eigenvalue problem is posed using the Fock-space
Hamiltonian operator obtained by solving the RGPEP equations up to second order
in powers of the coupling constant. The eigenstate components that contain
three quarks and two or more gluons are heuristically removed at the price of
inserting a gluon-mass term in the component with one gluon. The resulting
problem is reduced to the equivalent one for the component of three quarks and
no gluons. Each of the three quark-quark interaction terms thus obtained
consists of a spin-dependent Coulomb term and a spin-independent harmonic
oscillator term. Quark masses are chosen to fit the lightest spin-one quarkonia
masses most accurately. The resulting estimates for bbb and ccc states match
estimates obtained in lattice QCD and in quark models. Masses of ccb and bbc
states are also estimated. The corresponding wave functions are invariant with
respect to boosts. In the ccb states, charm quarks tend to form diquarks. The
accuracy of our approximate Hamiltonian can be estimated through comparison by
including components with two gluons within the same method.
| [
{
"created": "Wed, 9 May 2018 09:46:42 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Dec 2018 12:26:21 GMT",
"version": "v2"
}
] | 2018-12-06 | [
[
"Serafin",
"Kamil",
""
],
[
"Gómez-Rocha",
"María",
""
],
[
"More",
"Jai",
""
],
[
"Głazek",
"Stanisław D.",
""
]
] | Aiming at relativistic description of gluons in hadrons, the renormalization group procedure for effective particles (RGPEP) is applied to baryons in QCD of heavy quarks. The baryon eigenvalue problem is posed using the Fock-space Hamiltonian operator obtained by solving the RGPEP equations up to second order in powers of the coupling constant. The eigenstate components that contain three quarks and two or more gluons are heuristically removed at the price of inserting a gluon-mass term in the component with one gluon. The resulting problem is reduced to the equivalent one for the component of three quarks and no gluons. Each of the three quark-quark interaction terms thus obtained consists of a spin-dependent Coulomb term and a spin-independent harmonic oscillator term. Quark masses are chosen to fit the lightest spin-one quarkonia masses most accurately. The resulting estimates for bbb and ccc states match estimates obtained in lattice QCD and in quark models. Masses of ccb and bbc states are also estimated. The corresponding wave functions are invariant with respect to boosts. In the ccb states, charm quarks tend to form diquarks. The accuracy of our approximate Hamiltonian can be estimated through comparison by including components with two gluons within the same method. |
hep-ph/0103212 | Roman Nikolaevich Lee | R.N. Lee, A.I. Milstein | Coulomb corrections and multiple e+e- pair production in
ultra-relativistic nuclear collisions | 7 pages, REVTeX4 | Phys.Rev.A64:032106,2001 | 10.1103/PhysRevA.64.032106 | null | hep-ph nucl-th | null | We consider the problem of Coulomb corrections to the inclusive cross
section. We show that these corrections in the limiting case of small charge
number of one of the nuclei coincide with those to the exclusive cross section.
Within our approach we also obtain the Coulomb corrections for the case of
large charge numbers of both nuclei.
| [
{
"created": "Tue, 20 Mar 2001 11:22:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lee",
"R. N.",
""
],
[
"Milstein",
"A. I.",
""
]
] | We consider the problem of Coulomb corrections to the inclusive cross section. We show that these corrections in the limiting case of small charge number of one of the nuclei coincide with those to the exclusive cross section. Within our approach we also obtain the Coulomb corrections for the case of large charge numbers of both nuclei. |
1606.09003 | Ilkka Helenius | Ilkka Helenius, Hannu Paukkunen, Nestor Armesto | nPDF constraints from the Large Hadron Electron Collider | Talk presented at DIS2016 conference, April 11 - April 15, 2016,
DESY, Hamburg, Germany | null | null | LU TP 16-34 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An updated analysis regarding the expected nuclear PDF constraints from the
future Large Hadron Electron Collider (LHeC) experiment is presented. The new
study is based on a more flexible small-$x$ parametrization which provides less
biased uncertainty estimates in the region where there are currently no data
constraints. The effect of the LHeC is quantified by directly including a
sample of pseudodata according to the expected precision of this planned
experiment. As a result, a significant reduction of the small-$x$ uncertainties
in sea quarks and gluons is observed.
| [
{
"created": "Wed, 29 Jun 2016 08:49:05 GMT",
"version": "v1"
}
] | 2016-06-30 | [
[
"Helenius",
"Ilkka",
""
],
[
"Paukkunen",
"Hannu",
""
],
[
"Armesto",
"Nestor",
""
]
] | An updated analysis regarding the expected nuclear PDF constraints from the future Large Hadron Electron Collider (LHeC) experiment is presented. The new study is based on a more flexible small-$x$ parametrization which provides less biased uncertainty estimates in the region where there are currently no data constraints. The effect of the LHeC is quantified by directly including a sample of pseudodata according to the expected precision of this planned experiment. As a result, a significant reduction of the small-$x$ uncertainties in sea quarks and gluons is observed. |
1509.06765 | Mike Williams | Philip Ilten, Jesse Thaler, Mike Williams and Wei Xue | Dark photons from charm mesons at LHCb | 19 pages, 11 figures, 1 table; v2: references added | Phys. Rev. D 92, 115017 (2015) | 10.1103/PhysRevD.92.115017 | MIT-CTP 4702 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a search for dark photons $A^{\prime}$ at the LHCb experiment
using the charm meson decay $D^*(2007)^0 \!\to D^0 A^{\prime}$. At nominal
luminosity, $D^{*0} \!\to D^0 \gamma$ decays will be produced at about 700kHz
within the LHCb acceptance, yielding over 5 trillion such decays during Run 3
of the LHC. Replacing the photon with a kinetically-mixed dark photon, LHCb is
then sensitive to dark photons that decay as $A^{\prime}\!\to e^+e^-$. We
pursue two search strategies in this paper. The displaced strategy takes
advantage of the large Lorentz boost of the dark photon and the excellent
vertex resolution of LHCb, yielding a nearly background-free search when the
$A^{\prime}$ decay vertex is significantly displaced from the proton-proton
primary vertex. The resonant strategy takes advantage of the large event rate
for $D^{*0} \!\to D^0 A^{\prime}$ and the excellent invariant mass resolution
of LHCb, yielding a background-limited search that nevertheless covers a
significant portion of the $A^{\prime}$ parameter space. Both search strategies
rely on the planned upgrade to a triggerless-readout system at LHCb in Run 3,
which will permit identification of low-momentum electron-positron pairs online
during data taking. For dark photon masses below about 100MeV, LHCb can explore
nearly all of the dark photon parameter space between existing
prompt-$A^{\prime}$ and beam-dump limits.
| [
{
"created": "Tue, 22 Sep 2015 20:25:33 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Oct 2015 01:03:44 GMT",
"version": "v2"
}
] | 2015-12-30 | [
[
"Ilten",
"Philip",
""
],
[
"Thaler",
"Jesse",
""
],
[
"Williams",
"Mike",
""
],
[
"Xue",
"Wei",
""
]
] | We propose a search for dark photons $A^{\prime}$ at the LHCb experiment using the charm meson decay $D^*(2007)^0 \!\to D^0 A^{\prime}$. At nominal luminosity, $D^{*0} \!\to D^0 \gamma$ decays will be produced at about 700kHz within the LHCb acceptance, yielding over 5 trillion such decays during Run 3 of the LHC. Replacing the photon with a kinetically-mixed dark photon, LHCb is then sensitive to dark photons that decay as $A^{\prime}\!\to e^+e^-$. We pursue two search strategies in this paper. The displaced strategy takes advantage of the large Lorentz boost of the dark photon and the excellent vertex resolution of LHCb, yielding a nearly background-free search when the $A^{\prime}$ decay vertex is significantly displaced from the proton-proton primary vertex. The resonant strategy takes advantage of the large event rate for $D^{*0} \!\to D^0 A^{\prime}$ and the excellent invariant mass resolution of LHCb, yielding a background-limited search that nevertheless covers a significant portion of the $A^{\prime}$ parameter space. Both search strategies rely on the planned upgrade to a triggerless-readout system at LHCb in Run 3, which will permit identification of low-momentum electron-positron pairs online during data taking. For dark photon masses below about 100MeV, LHCb can explore nearly all of the dark photon parameter space between existing prompt-$A^{\prime}$ and beam-dump limits. |
1405.5431 | Filippo Sala | Filippo Sala | The neutron EDM vs up and charm flavour violation | 6 pages, 2 figures, contribution to the proceedings of Rencontres de
Moriond EW 2014 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a strong bound on the chromo-electric dipole moment of the charm
quark, and we quantify its impact on models that allow for a sizeable flavour
violation in the up quark sector. In particular we show how the constraints
coming from the charm and up CEDMs limit the size of new physics contributions
to direct flavour violation in D meson decays. We also specialize our analysis
to the cases of split-families Supersymmetry and composite Higgs models. The
results we expose motivate an increase in experimental sensitivity to
fundamental hadronic dipoles, and a further exploration of the SM contribution
to both flavour violating D decays and nuclear electric dipole moments.
| [
{
"created": "Wed, 21 May 2014 14:19:08 GMT",
"version": "v1"
}
] | 2014-05-22 | [
[
"Sala",
"Filippo",
""
]
] | We derive a strong bound on the chromo-electric dipole moment of the charm quark, and we quantify its impact on models that allow for a sizeable flavour violation in the up quark sector. In particular we show how the constraints coming from the charm and up CEDMs limit the size of new physics contributions to direct flavour violation in D meson decays. We also specialize our analysis to the cases of split-families Supersymmetry and composite Higgs models. The results we expose motivate an increase in experimental sensitivity to fundamental hadronic dipoles, and a further exploration of the SM contribution to both flavour violating D decays and nuclear electric dipole moments. |
0810.0400 | Tom\'a\v{s} Brauner | Hiroaki Abuki and Tomas Brauner | Strongly interacting Fermi systems in 1/N expansion: From cold atoms to
color superconductivity | 13 pages, REVTeX4, 11 eps figures; v2: reference added, version to
appear in Phys. Rev. D | Phys.Rev.D78:125010,2008 | 10.1103/PhysRevD.78.125010 | null | hep-ph cond-mat.supr-con nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the 1/N expansion proposed recently as a strategy to include
quantum fluctuation effects in the nonrelativistic, attractive Fermi gas at and
near unitarity. We extend the previous results by calculating the
next-to-leading order corrections to the critical temperature along the whole
BCS-BEC crossover. We demonstrate explicitly that the extrapolation from the
mean-field approximation, based on the $1/N$ expansion, provides a useful
approximation scheme only on the BCS side of the crossover. We then apply the
technique to the study of strongly interacting relativistic many-fermion
systems. Having in mind the application to color superconductivity in cold
dense quark matter, we develop, within a simple model, a formalism suitable to
compare the effects of order parameter fluctuations in phases with different
pairing patterns. Our main conclusion is that the relative correction to the
critical temperature is to a good accuracy proportional to the mean-field ratio
of the critical temperature and the chemical potential. As a consequence, it is
significant even rather deep in the BCS regime, where phenomenologically
interesting values of the quark-quark coupling are expected. Possible impact on
the phase diagram of color-superconducting quark matter is discussed.
| [
{
"created": "Thu, 2 Oct 2008 12:15:51 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 2008 08:32:05 GMT",
"version": "v2"
}
] | 2010-04-15 | [
[
"Abuki",
"Hiroaki",
""
],
[
"Brauner",
"Tomas",
""
]
] | We investigate the 1/N expansion proposed recently as a strategy to include quantum fluctuation effects in the nonrelativistic, attractive Fermi gas at and near unitarity. We extend the previous results by calculating the next-to-leading order corrections to the critical temperature along the whole BCS-BEC crossover. We demonstrate explicitly that the extrapolation from the mean-field approximation, based on the $1/N$ expansion, provides a useful approximation scheme only on the BCS side of the crossover. We then apply the technique to the study of strongly interacting relativistic many-fermion systems. Having in mind the application to color superconductivity in cold dense quark matter, we develop, within a simple model, a formalism suitable to compare the effects of order parameter fluctuations in phases with different pairing patterns. Our main conclusion is that the relative correction to the critical temperature is to a good accuracy proportional to the mean-field ratio of the critical temperature and the chemical potential. As a consequence, it is significant even rather deep in the BCS regime, where phenomenologically interesting values of the quark-quark coupling are expected. Possible impact on the phase diagram of color-superconducting quark matter is discussed. |
hep-ph/9906211 | Cetin Savkli | C. Savkli, J. Tjon, F. Gross | Feynman-Schwinger representation approach to nonperturbative physics | 26 pages, 9 figures, minor correction | Phys.Rev.C60:055210,1999; Erratum-ibid.C61:069901,2000 | 10.1103/PhysRevC.60.055210 10.1103/PhysRevC.61.069901 | WM-99-109 | hep-ph | null | The Feynman-Schwinger representation provides a convenient framework for the
cal culation of nonperturbative propagators. In this paper we first investigate
an analytically solvable case, namely the scalar QED in 0+1 dimension. With
this toy model we illustrate how the formalism works. The analytic result for
the self energy is compared with the perturbative result. Next, using a
$\chi^2\phi$ interaction, we discuss the regularization of various divergences
encountered in this formalism. The ultraviolet divergence, which is common in
standard perturbative field theory applications, is removed by using a
Pauli-Villars regularization. We show that the divergence associated with large
values of Feynman-Schwinger parameter $s$ is spurious and it can be avoided by
using an imaginary Feynman parameter $is$.
| [
{
"created": "Wed, 2 Jun 1999 03:32:17 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Sep 1999 19:44:48 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Savkli",
"C.",
""
],
[
"Tjon",
"J.",
""
],
[
"Gross",
"F.",
""
]
] | The Feynman-Schwinger representation provides a convenient framework for the cal culation of nonperturbative propagators. In this paper we first investigate an analytically solvable case, namely the scalar QED in 0+1 dimension. With this toy model we illustrate how the formalism works. The analytic result for the self energy is compared with the perturbative result. Next, using a $\chi^2\phi$ interaction, we discuss the regularization of various divergences encountered in this formalism. The ultraviolet divergence, which is common in standard perturbative field theory applications, is removed by using a Pauli-Villars regularization. We show that the divergence associated with large values of Feynman-Schwinger parameter $s$ is spurious and it can be avoided by using an imaginary Feynman parameter $is$. |
hep-ph/9406209 | Aneesh V. Manohar | Aneesh V. Manohar | Baryons in the Large N Limit | (12 pages, 3 figures. Uses harvmac and uufiles), UCSD/PTH 94-01 | null | null | null | hep-ph | null | The properties of baryons can be computed in a systematic expansion in
$1/N_c$, where $N_c$ is the number of colors. Recent results on the axial
couplings and masses of baryons (for the case of three flavors) are presented.
The results give insight into the structure of flavor $SU(3)$ breaking for
baryons.
----------------------------------------------------------------------------
Talks presented at the Symposium on Internal Spin Structure of the Nucleon
(Yale University, Jan 94) and at the Workshop on Continuous Advances in QCD
(Theoretical Physics Institute, University of Minnesota, Feb 94).
| [
{
"created": "Wed, 1 Jun 1994 22:31:08 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Manohar",
"Aneesh V.",
""
]
] | The properties of baryons can be computed in a systematic expansion in $1/N_c$, where $N_c$ is the number of colors. Recent results on the axial couplings and masses of baryons (for the case of three flavors) are presented. The results give insight into the structure of flavor $SU(3)$ breaking for baryons. ---------------------------------------------------------------------------- Talks presented at the Symposium on Internal Spin Structure of the Nucleon (Yale University, Jan 94) and at the Workshop on Continuous Advances in QCD (Theoretical Physics Institute, University of Minnesota, Feb 94). |
1710.08161 | Szymon Tracz | Henryk Czy\.z, Johann H. K\"uhn, Szymon Tracz | Direct, Resonant Production of States with Positive Charge Conjugation
in Electron-Positron Annihilation | 7 pages, 6 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent theory results on direct production of resonances with positive charge
conjugation in electron-positron annihilation are reviewed. The strong model
dependence is emphasized, with predictions varying between 0.03 eV and 0.43 eV
for the charmonium state with $J^{PC} = 1^{++}$ and between 0.16 eV and 4.25 eV
for the state with $J^{PC} = 2^{++}$. For the state with $J^{PC} = 0^{++}$ the
cross section is of $\cal{O}$ $(m^2_e/M^2_{\chi})$ and thus negligeable for all
practical purpose. The importance of the relative phase of the production
amplitude is emphasized.
| [
{
"created": "Mon, 23 Oct 2017 09:23:45 GMT",
"version": "v1"
}
] | 2017-10-24 | [
[
"Czyż",
"Henryk",
""
],
[
"Kühn",
"Johann H.",
""
],
[
"Tracz",
"Szymon",
""
]
] | Recent theory results on direct production of resonances with positive charge conjugation in electron-positron annihilation are reviewed. The strong model dependence is emphasized, with predictions varying between 0.03 eV and 0.43 eV for the charmonium state with $J^{PC} = 1^{++}$ and between 0.16 eV and 4.25 eV for the state with $J^{PC} = 2^{++}$. For the state with $J^{PC} = 0^{++}$ the cross section is of $\cal{O}$ $(m^2_e/M^2_{\chi})$ and thus negligeable for all practical purpose. The importance of the relative phase of the production amplitude is emphasized. |
1412.8034 | Ian Shoemaker | Francesco Sannino, Ian M. Shoemaker | Asymptotically Safe Dark Matter | 5 pages, 2 multi-panel figures, PRD version | Phys. Rev. D 92, 043518 (2015) | 10.1103/PhysRevD.92.043518 | CP3-Origins-2014-047 DNRF90, DIAS-2014-47 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new paradigm for dark matter (DM) interactions in which the
interaction strength is asymptotically safe. In models of this type, the
coupling strength is small at low energies but increases at higher energies,
and asymptotically approaches a finite constant value. The resulting
phenomenology of this "asymptotically safe DM" is quite distinct. One
interesting effect of this is to partially offset the low-energy constraints
from direct detection experiments without affecting thermal freeze-out
processes which occur at higher energies. High-energy collider and indirect
annihilation searches are the primary ways to constrain or discover
asymptotically safe dark matter.
| [
{
"created": "Sat, 27 Dec 2014 11:18:25 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2015 10:24:15 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Aug 2015 19:35:11 GMT",
"version": "v3"
}
] | 2015-09-02 | [
[
"Sannino",
"Francesco",
""
],
[
"Shoemaker",
"Ian M.",
""
]
] | We introduce a new paradigm for dark matter (DM) interactions in which the interaction strength is asymptotically safe. In models of this type, the coupling strength is small at low energies but increases at higher energies, and asymptotically approaches a finite constant value. The resulting phenomenology of this "asymptotically safe DM" is quite distinct. One interesting effect of this is to partially offset the low-energy constraints from direct detection experiments without affecting thermal freeze-out processes which occur at higher energies. High-energy collider and indirect annihilation searches are the primary ways to constrain or discover asymptotically safe dark matter. |
1110.1182 | Alma D. Rojas | Alfredo Aranda, Cesar Bonilla and Alma D. Rojas | Neutrino masses generation in a Z_4 model | v1:24 pages, 4 figures,v2: references added,v3:25 pages, 4 figures,
corrections and improvements have been made, all data and figures have been
updated and typos fixed | Phys. Rev. D 85, 036004 (2012) | 10.1103/PhysRevD.85.036004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a renormalizable flavor model with Z_4 as flavor symmetry in both
the quark and lepton sectors. The model is constructed with a minimal approach
and no-right handed neutrinos are introduced. In this approach a minimum number
of two SU(2) Higgs doublets and one scalar singlet are required in order to
obtain the Nearest Neighbor Interaction form for charged fermions and to
generate neutrino masses radiatively. For the quark sector we follow the charge
assignations made by Branco et. al. in reference [1]. All fermion masses and
mixing angles in the model are in agreement with current experimental data and
only the inverted hierarchy for the neutrino mass spectrum is allowed. Since
neutrinos are Majorana the contribution to neutrinoless double beta decay is
also analyzed.
| [
{
"created": "Thu, 6 Oct 2011 08:36:07 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2011 01:16:02 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Feb 2012 03:33:36 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Aranda",
"Alfredo",
""
],
[
"Bonilla",
"Cesar",
""
],
[
"Rojas",
"Alma D.",
""
]
] | We present a renormalizable flavor model with Z_4 as flavor symmetry in both the quark and lepton sectors. The model is constructed with a minimal approach and no-right handed neutrinos are introduced. In this approach a minimum number of two SU(2) Higgs doublets and one scalar singlet are required in order to obtain the Nearest Neighbor Interaction form for charged fermions and to generate neutrino masses radiatively. For the quark sector we follow the charge assignations made by Branco et. al. in reference [1]. All fermion masses and mixing angles in the model are in agreement with current experimental data and only the inverted hierarchy for the neutrino mass spectrum is allowed. Since neutrinos are Majorana the contribution to neutrinoless double beta decay is also analyzed. |
1110.0265 | Thomas Mehen | Sean Fleming (U. of Arizona) and Thomas Mehen (Duke U.) | The decay of the X(3872) into \chi_{cJ} and the Operator Product
Expansion in XEFT | 20 pages, 10 figures | null | 10.1103/PhysRevD.85.014016 | INT-PUB-11-042 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | XEFT is a low energy effective theory for the X(3872) that can be used to
systematically analyze the decay and production of the X(3872) meson, assuming
that it is a weakly bound state of charmed mesons. In a previous paper, we
calculated the decays of X(3872) into \chi_{cJ} plus pions using a two-step
procedure in which Heavy Hadron Chiral Perturbation Theory (HH\chiPT)
amplitudes are matched onto XEFT operators and then X(3872) decay rates are
then calculated using these operators. The procedure leads to IR divergences in
the three-body decay X(3872) \to \chi_{cJ} \pi \pi when virtual D mesons can go
on-shell in tree level HH\chiPT diagrams. In previous work, we regulated these
IR divergences with the $D^{*0}$ width. In this work, we carefully analyze
X(3872) \to \chi_{cJ} \pi^0 and X(3872) \to \chi_{cJ} \pi \pi using the
operator product expansion (OPE) in XEFT. Forward scattering amplitudes in
HH\chiPT are matched onto local operators in XEFT, the imaginary parts of which
are responsible for the decay of the X(3872). Here we show that the IR
divergences are regulated by the binding momentum of the X(3872) rather than
the width of the D^{*0} meson. In the OPE, these IR divergences cancel in the
calculation of the matching coefficients so the correct predictions for the
X(3872) \to \chi_{c1} \pi \pi do not receive enhancements due to the width of
the D^{*0}. We give updated predictions for the decay X(3872) \to \chi_{c1} \pi
\pi at leading order in XEFT.
| [
{
"created": "Mon, 3 Oct 2011 04:45:03 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Oct 2011 22:20:03 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Fleming",
"Sean",
"",
"U. of Arizona"
],
[
"Mehen",
"Thomas",
"",
"Duke U."
]
] | XEFT is a low energy effective theory for the X(3872) that can be used to systematically analyze the decay and production of the X(3872) meson, assuming that it is a weakly bound state of charmed mesons. In a previous paper, we calculated the decays of X(3872) into \chi_{cJ} plus pions using a two-step procedure in which Heavy Hadron Chiral Perturbation Theory (HH\chiPT) amplitudes are matched onto XEFT operators and then X(3872) decay rates are then calculated using these operators. The procedure leads to IR divergences in the three-body decay X(3872) \to \chi_{cJ} \pi \pi when virtual D mesons can go on-shell in tree level HH\chiPT diagrams. In previous work, we regulated these IR divergences with the $D^{*0}$ width. In this work, we carefully analyze X(3872) \to \chi_{cJ} \pi^0 and X(3872) \to \chi_{cJ} \pi \pi using the operator product expansion (OPE) in XEFT. Forward scattering amplitudes in HH\chiPT are matched onto local operators in XEFT, the imaginary parts of which are responsible for the decay of the X(3872). Here we show that the IR divergences are regulated by the binding momentum of the X(3872) rather than the width of the D^{*0} meson. In the OPE, these IR divergences cancel in the calculation of the matching coefficients so the correct predictions for the X(3872) \to \chi_{c1} \pi \pi do not receive enhancements due to the width of the D^{*0}. We give updated predictions for the decay X(3872) \to \chi_{c1} \pi \pi at leading order in XEFT. |
1305.6294 | Daniel Are\'an | Daniel Arean, Ioannis Iatrakis, Matti Jarvinen | The spectrum of (h)QCD in the Veneziano limit | 16 pages, 7 figures. Contribution to the XVIII European Workshop on
String Theory (Corfu, September 2012) | null | null | CCTP-2013-03 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we report on the analysis of the zero temperature spectra of
glueballs and mesons for holographic QCD in the Veneziano limit. We work within
a holographic bottom-up model named V-QCD which takes into account the full
backreaction of the flavor degrees of freedom. By studying the fluctuations of
this model we compute spectra of mesons and glueballs as a function of
x=N_f/N_c. The spectra are discrete and gapped (modulo the pions) in the QCD
regime, where x is below the critical value x_c at which the conformal
transition takes place. The masses uniformly converge to zero in the walking
region x -> x_c following Miransky scaling. Moreover, all the ratios of masses
asymptote to finite constants as x -> x_c. Therefore there is no "dilaton" in
the spectrum. Finally, we compute the S-parameter, which is found to be of O(1)
in the walking regime.
| [
{
"created": "Mon, 27 May 2013 19:02:49 GMT",
"version": "v1"
}
] | 2013-05-28 | [
[
"Arean",
"Daniel",
""
],
[
"Iatrakis",
"Ioannis",
""
],
[
"Jarvinen",
"Matti",
""
]
] | In this note we report on the analysis of the zero temperature spectra of glueballs and mesons for holographic QCD in the Veneziano limit. We work within a holographic bottom-up model named V-QCD which takes into account the full backreaction of the flavor degrees of freedom. By studying the fluctuations of this model we compute spectra of mesons and glueballs as a function of x=N_f/N_c. The spectra are discrete and gapped (modulo the pions) in the QCD regime, where x is below the critical value x_c at which the conformal transition takes place. The masses uniformly converge to zero in the walking region x -> x_c following Miransky scaling. Moreover, all the ratios of masses asymptote to finite constants as x -> x_c. Therefore there is no "dilaton" in the spectrum. Finally, we compute the S-parameter, which is found to be of O(1) in the walking regime. |
0806.3958 | Juan Rojo | Juan Rojo | Quantifying the performance of jet algorithms at LHC | 4 pages, 6 figs, to appear in the proceedings of the DIS 2008
Workshop, 7-11 April 2008, University College London, references corrected | null | null | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present contribution we introduce a strategy to quantify the
performance of modern infrared and collinear safe jet clustering algorithms in
processes which involve the reconstruction of heavy object decays. We determine
optimal choices for fictional narrow $Z'\to q\bar{q}$ and $H\to gg$ over a
range of masses, providing examples of simple quark-jet and gluon-jet samples
respectively. We show also that our estimates are robust against the presence
of high-luminosity pileup.
| [
{
"created": "Tue, 24 Jun 2008 19:39:26 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 2008 16:04:33 GMT",
"version": "v2"
}
] | 2008-06-25 | [
[
"Rojo",
"Juan",
""
]
] | In the present contribution we introduce a strategy to quantify the performance of modern infrared and collinear safe jet clustering algorithms in processes which involve the reconstruction of heavy object decays. We determine optimal choices for fictional narrow $Z'\to q\bar{q}$ and $H\to gg$ over a range of masses, providing examples of simple quark-jet and gluon-jet samples respectively. We show also that our estimates are robust against the presence of high-luminosity pileup. |
0709.1486 | Haibo Yu | R. N. Mohapatra, Nobuchika Okada and Hai-Bo Yu | Diquark Higgs at LHC | 5 pages, 3 figures | Phys.Rev.D77:011701,2008 | 10.1103/PhysRevD.77.011701 | UMD-PP-07-010 | hep-ph | null | Existence of color sextet diquark Higgs fields with TeV masses will indicate
a fundamentally different direction for unification than conventional grand
unified theories. There is a class of partial unification models based on the
gauge group $SU(2)_L\times SU(2)_R\times SU(4)_c$ that implement the seesaw
mechanism for neutrino mass with seesaw scale around $10^{11}$ GeV, where
indeed such light fields appear naturally despite the high gauge symmetry
breaking scale. They couple only to up-type quarks in this model.
We discuss phenomenological constraints on these fields and show that they
could be detected at LHC via their decay to either $tt$ or single top + jet. We
also find that existing Tevatron data gives a lower bound on its mass somewhere
in the 400-500 GeV, for reasonable values of its coupling.
| [
{
"created": "Mon, 10 Sep 2007 21:09:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mohapatra",
"R. N.",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Yu",
"Hai-Bo",
""
]
] | Existence of color sextet diquark Higgs fields with TeV masses will indicate a fundamentally different direction for unification than conventional grand unified theories. There is a class of partial unification models based on the gauge group $SU(2)_L\times SU(2)_R\times SU(4)_c$ that implement the seesaw mechanism for neutrino mass with seesaw scale around $10^{11}$ GeV, where indeed such light fields appear naturally despite the high gauge symmetry breaking scale. They couple only to up-type quarks in this model. We discuss phenomenological constraints on these fields and show that they could be detected at LHC via their decay to either $tt$ or single top + jet. We also find that existing Tevatron data gives a lower bound on its mass somewhere in the 400-500 GeV, for reasonable values of its coupling. |
0901.0266 | Ian Low | Ian Low and Shashank Shalgar | Implications of the Higgs Discovery in the MSSM Golden Region | 17 pages and 6 figures; v2: minor revision and added references to
match JHEP version | JHEP 0904:091,2009 | 10.1088/1126-6708/2009/04/091 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the lightest CP-even Higgs boson in the MSSM is discovered at the LHC, two
measurements could be made simultaneously: the Higgs mass m_h and the event
rate Bs(gg -> h -> gamma gamma). We study to what extent the combination of
these two measurements would allow us to extract parameters in the stop mass
matrix, including the off-diagonal mixing term, with a focus on the MSSM golden
region where the stops are light and the mixing is large. Even though both the
production cross-section and the decay amplitude are not sensitive to
supersymmetric parameters outside of the stop sector, the branching ratio
depends on the total decay width, which is dominated by the Higgs decay to b
quarks and sensitive to both the pseudo-scalar mass m_A and the supersymmetric
Higgs mass \mu. In the end we find m_A is an important input in extracting the
stop mass parameters, while a fair estimate of the off-diagonal mixing term
could be obtained without prior knowledge of \mu.
| [
{
"created": "Fri, 2 Jan 2009 18:25:41 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 2009 21:55:08 GMT",
"version": "v2"
}
] | 2009-05-01 | [
[
"Low",
"Ian",
""
],
[
"Shalgar",
"Shashank",
""
]
] | If the lightest CP-even Higgs boson in the MSSM is discovered at the LHC, two measurements could be made simultaneously: the Higgs mass m_h and the event rate Bs(gg -> h -> gamma gamma). We study to what extent the combination of these two measurements would allow us to extract parameters in the stop mass matrix, including the off-diagonal mixing term, with a focus on the MSSM golden region where the stops are light and the mixing is large. Even though both the production cross-section and the decay amplitude are not sensitive to supersymmetric parameters outside of the stop sector, the branching ratio depends on the total decay width, which is dominated by the Higgs decay to b quarks and sensitive to both the pseudo-scalar mass m_A and the supersymmetric Higgs mass \mu. In the end we find m_A is an important input in extracting the stop mass parameters, while a fair estimate of the off-diagonal mixing term could be obtained without prior knowledge of \mu. |
2004.09701 | Dian-Yong Chen | Dian-Yong Chen, Jing Liu and Jun He | Reconciling the X(2240) with the Y(2175) | 7 pages, 5 figures, 3 tables, accepted for publication in the
Phys.Rev.D | Phys. Rev. D 101, 074045 (2020) | 10.1103/PhysRevD.101.074045 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we reanalyzed the cross sections for $e^+ e^- \to
K^+K^-$, where a new structure $X(2240)$ was reported by BES III Collaboration.
By including the interference between the direct coupling and vector meson
intermediate processes, we find the mass and width of $X(2240)$ are $2197.4\pm
4.4$ MeV and $75.6\pm 7.2 $ MeV, respectively, which are well consistent with
the PDG average values of the resonance parameters for $Y(2175)$, thus, we
conclude that the $X(2240)$ should be the same state as the $Y(2175)$.
| [
{
"created": "Tue, 21 Apr 2020 01:28:41 GMT",
"version": "v1"
}
] | 2020-05-06 | [
[
"Chen",
"Dian-Yong",
""
],
[
"Liu",
"Jing",
""
],
[
"He",
"Jun",
""
]
] | In the present work, we reanalyzed the cross sections for $e^+ e^- \to K^+K^-$, where a new structure $X(2240)$ was reported by BES III Collaboration. By including the interference between the direct coupling and vector meson intermediate processes, we find the mass and width of $X(2240)$ are $2197.4\pm 4.4$ MeV and $75.6\pm 7.2 $ MeV, respectively, which are well consistent with the PDG average values of the resonance parameters for $Y(2175)$, thus, we conclude that the $X(2240)$ should be the same state as the $Y(2175)$. |
2211.10513 | Kazuki Sakurai | Mohammad Mahdi Altakach, Priyanka Lamba, Fabio Maltoni, Kentarou
Mawatari and Kazuki Sakurai | Quantum information and CP measurement in $H \to \tau^+ \tau^-$ at
future lepton colliders | 14 pages, 2 figures, Version published in PRD | null | 10.1103/PhysRevD.107.093002 | null | hep-ph hep-ex quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a methodology and investigate the feasibility of measuring
quantum properties of tau lepton pairs in the $H \to \tau^+ \tau^-$ decay at
future lepton colliders. In particular, observation of entanglement,
steerability and violation of Bell inequalities are examined for the ILC and
FCC-ee. We find that detecting quantum correlation crucially relies on precise
reconstruction of the tau lepton rest frame and a simple kinematics
reconstruction does not suffice due to the finite energy resolution of the
colliding beams and detectors. To correct for energy mismeasurements, a
log-likelihood method is developed that incorporates the information of impact
parameters of tau lepton decays. We demonstrate that an accurate measurement of
quantum properties is possible with this method. As a by-product, we show that
a novel model-independent test of CP violation can be performed and the
CP-phase of $H \tau \tau$ interaction can be constrained with an accuracy
comparable to dedicated analyses, i.e., up to $7.9^{\circ}$ and $5.4^{\circ}$
at ILC and FCC-ee, respectively.
| [
{
"created": "Fri, 18 Nov 2022 21:41:29 GMT",
"version": "v1"
},
{
"created": "Fri, 12 May 2023 09:39:01 GMT",
"version": "v2"
}
] | 2023-05-15 | [
[
"Altakach",
"Mohammad Mahdi",
""
],
[
"Lamba",
"Priyanka",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Mawatari",
"Kentarou",
""
],
[
"Sakurai",
"Kazuki",
""
]
] | We introduce a methodology and investigate the feasibility of measuring quantum properties of tau lepton pairs in the $H \to \tau^+ \tau^-$ decay at future lepton colliders. In particular, observation of entanglement, steerability and violation of Bell inequalities are examined for the ILC and FCC-ee. We find that detecting quantum correlation crucially relies on precise reconstruction of the tau lepton rest frame and a simple kinematics reconstruction does not suffice due to the finite energy resolution of the colliding beams and detectors. To correct for energy mismeasurements, a log-likelihood method is developed that incorporates the information of impact parameters of tau lepton decays. We demonstrate that an accurate measurement of quantum properties is possible with this method. As a by-product, we show that a novel model-independent test of CP violation can be performed and the CP-phase of $H \tau \tau$ interaction can be constrained with an accuracy comparable to dedicated analyses, i.e., up to $7.9^{\circ}$ and $5.4^{\circ}$ at ILC and FCC-ee, respectively. |
2304.00041 | Yoxara S\'anchez Villamizar | S. Kovalenko, A. S. de Jesus, A. R. Zerwekh, Y.M. Oviedo-Torres, F. S.
Queiroz, T. B. de Melo, J. P. Neto, Y. S. Villamizar | On the Role of LHC and HL-LHC in Constraining Flavor Changing Neutral
Currents | 11 pages, 7 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The Standard Model (SM) has no flavor-changing neutral current (FCNC)
processes at the tree level. Therefore, processes featuring FCNC in new physics
are tightly constrained by data. Typically, the lower bounds on the scale of
new physics obtained from $K-\bar{K}$ or $B-\bar{B}$ mixing lie well above 10
TeV, surpassing the reach of current and future colliders. In this paper, we
demonstrate, using a specific Z' model, that such limits can be severely
weakened by applying certain parametrizations of the quark mixing matrices with
no prejudice while maintaining the CKM matrix in agreement with the data. We
highlight the valuable role of the often-overlooked D0 mixing in deriving
robust FCNC limits and show that the LHC and HL-LHC are promising probes for
flavor-changing interactions mediated by a Z' boson.
| [
{
"created": "Fri, 31 Mar 2023 18:01:00 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2023 11:24:41 GMT",
"version": "v2"
}
] | 2023-12-05 | [
[
"Kovalenko",
"S.",
""
],
[
"de Jesus",
"A. S.",
""
],
[
"Zerwekh",
"A. R.",
""
],
[
"Oviedo-Torres",
"Y. M.",
""
],
[
"Queiroz",
"F. S.",
""
],
[
"de Melo",
"T. B.",
""
],
[
"Neto",
"J. P.",
""
],
[
"Villamizar",
"Y. S.",
""
]
] | The Standard Model (SM) has no flavor-changing neutral current (FCNC) processes at the tree level. Therefore, processes featuring FCNC in new physics are tightly constrained by data. Typically, the lower bounds on the scale of new physics obtained from $K-\bar{K}$ or $B-\bar{B}$ mixing lie well above 10 TeV, surpassing the reach of current and future colliders. In this paper, we demonstrate, using a specific Z' model, that such limits can be severely weakened by applying certain parametrizations of the quark mixing matrices with no prejudice while maintaining the CKM matrix in agreement with the data. We highlight the valuable role of the often-overlooked D0 mixing in deriving robust FCNC limits and show that the LHC and HL-LHC are promising probes for flavor-changing interactions mediated by a Z' boson. |
hep-ph/0403049 | Jan van Leusen | S. Barshay, L. M. Sehgal and J. van Leusen | Large Direct CP Violation in B^0 -> pi^+ pi^- and an Enhanced Branching
Ratio for B^0 -> pi^0 pi^0 | 10 pages, 2 figures, 1 table; v2: Misprint corrected in Eq. (12),
second line: -a_m replaced by +a_m. To appear in Phys. Lett. B | Phys.Lett. B591 (2004) 97-103 | 10.1016/j.physletb.2004.04.014 | null | hep-ph | null | Recent measurements of B^0 -> pi pi decays reveal two features that are in
conflict with conventional calculations: the channel B^0 (Bbar^0) -> pi^+ pi^-
shows a large direct CP-violating asymmetry, and the channel B^0 (B^0) -> pi^0
pi^0 has an unexpectedly high branching ratio. We show that both features can
be understood in terms of strong-interaction mixing of pi pi and D Dbar
channels in the isospin-zero state, an effect that is important because of the
large experimentally observed ratio Gamma(B^0 / Bbar^0 -> D^+ D^-) / Gamma (B^0
/ Bbar^0 -> pi^+ pi^-) approx. 50. Our dynamical model correlates the branching
ratios and the CP-violating parameters C and S, for the decays B^0 (Bbar^0) ->
pi^+ pi^-, B^0 (Bbar^0) -> pi^0 pi^0, B^0 (Bbar^0) -> D^+ D^- and B^0 (Bbar^0)
-> D^0 Dbar^0.
| [
{
"created": "Thu, 4 Mar 2004 16:44:58 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 2004 16:10:18 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Barshay",
"S.",
""
],
[
"Sehgal",
"L. M.",
""
],
[
"van Leusen",
"J.",
""
]
] | Recent measurements of B^0 -> pi pi decays reveal two features that are in conflict with conventional calculations: the channel B^0 (Bbar^0) -> pi^+ pi^- shows a large direct CP-violating asymmetry, and the channel B^0 (B^0) -> pi^0 pi^0 has an unexpectedly high branching ratio. We show that both features can be understood in terms of strong-interaction mixing of pi pi and D Dbar channels in the isospin-zero state, an effect that is important because of the large experimentally observed ratio Gamma(B^0 / Bbar^0 -> D^+ D^-) / Gamma (B^0 / Bbar^0 -> pi^+ pi^-) approx. 50. Our dynamical model correlates the branching ratios and the CP-violating parameters C and S, for the decays B^0 (Bbar^0) -> pi^+ pi^-, B^0 (Bbar^0) -> pi^0 pi^0, B^0 (Bbar^0) -> D^+ D^- and B^0 (Bbar^0) -> D^0 Dbar^0. |
hep-ph/0207267 | Mark Hindmarsh | Mark Hindmarsh (Sussex University) | Level Set Method for the Evolution of Defect and Brane Networks | 46pp LaTeX, revtex4(preprint), 1 eps figure, revised for publication.
Note title change | Phys.Rev. D68 (2003) 043510 | 10.1103/PhysRevD.68.043510 | SUSX-TH/02-013 | hep-ph | null | A theory for studying the dynamic scaling properties of branes and
relativistic topological defect networks is presented. The theory, based on a
relativistic version of the level set method, well-known in other contexts,
possesses self-similar ``scaling'' solutions, for which one can calculate many
quantities of interest. Here, the length and area densities of cosmic strings
and domain walls are calculated in Minkowski space, and radiation, matter, and
curvature-dominated FRW cosmologies with 2 and 3 space dimensions. The scaling
exponents agree the naive ones based on dimensional analysis, except for cosmic
strings in 3-dimensional Minkowski space, which are predicted to have a
logarithmic correction to the naive scaling form. The scaling amplitudes of the
length and area densities are a factor of approximately 2 lower than results
from numerical simulations of classical field theories. An expression for the
length density of strings in the condensed matter literature is corrected.
| [
{
"created": "Mon, 22 Jul 2002 16:24:29 GMT",
"version": "v1"
},
{
"created": "Tue, 13 May 2003 14:31:36 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Hindmarsh",
"Mark",
"",
"Sussex University"
]
] | A theory for studying the dynamic scaling properties of branes and relativistic topological defect networks is presented. The theory, based on a relativistic version of the level set method, well-known in other contexts, possesses self-similar ``scaling'' solutions, for which one can calculate many quantities of interest. Here, the length and area densities of cosmic strings and domain walls are calculated in Minkowski space, and radiation, matter, and curvature-dominated FRW cosmologies with 2 and 3 space dimensions. The scaling exponents agree the naive ones based on dimensional analysis, except for cosmic strings in 3-dimensional Minkowski space, which are predicted to have a logarithmic correction to the naive scaling form. The scaling amplitudes of the length and area densities are a factor of approximately 2 lower than results from numerical simulations of classical field theories. An expression for the length density of strings in the condensed matter literature is corrected. |
1512.00857 | Tomas Kasemets | Tomas Kasemets, Wouter J. Waalewijn, Lisa Zeune | Calculating Soft Radiation at One Loop | 21 pages, 1 figure; v2: references added | null | 10.1007/JHEP03(2016)153 | NIKHEF 2015-043 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an efficient way to calculate the effect of soft QCD radiation at
one loop, which is needed for predictions at next-to-next-to-leading
logarithmic accuracy. We use rapidity coordinates and isolate the divergences
in the integrand. By performing manipulations with cumulative variables, we
avoid complications from plus distributions. We address rapidity divergences,
divergences with an azimuthal dependence, complicated jet boundaries and
multi-differential measurements. The process and measurements can be easily
adjusted, as we demonstrate by reproducing many existing soft functions. The
results for a general LHC process with multiple Wilson lines are obtained by
treating Wilson lines that are not back-to-back using a boost. We also obtain,
for the first time, the N-jettiness soft function for generic jet angularities,
and the collinear-soft function for the measurement of two angularities.
| [
{
"created": "Wed, 2 Dec 2015 21:00:07 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Dec 2015 12:49:37 GMT",
"version": "v2"
}
] | 2016-04-20 | [
[
"Kasemets",
"Tomas",
""
],
[
"Waalewijn",
"Wouter J.",
""
],
[
"Zeune",
"Lisa",
""
]
] | We present an efficient way to calculate the effect of soft QCD radiation at one loop, which is needed for predictions at next-to-next-to-leading logarithmic accuracy. We use rapidity coordinates and isolate the divergences in the integrand. By performing manipulations with cumulative variables, we avoid complications from plus distributions. We address rapidity divergences, divergences with an azimuthal dependence, complicated jet boundaries and multi-differential measurements. The process and measurements can be easily adjusted, as we demonstrate by reproducing many existing soft functions. The results for a general LHC process with multiple Wilson lines are obtained by treating Wilson lines that are not back-to-back using a boost. We also obtain, for the first time, the N-jettiness soft function for generic jet angularities, and the collinear-soft function for the measurement of two angularities. |
hep-ph/0506224 | Feng Wu | Lincoln Wolfenstein and Feng Wu | Strong Phases in the Decays B to pi pi | 6 pages, 1 figures | Phys.Rev. D72 (2005) 077501 | 10.1103/PhysRevD.72.077501 | CMU-HEP-05-06 | hep-ph | null | Two sources of strong phases in the decays $B$ to $\pi\pi$ are identified:
(1) "quasi-elastic scattering" corresponding to intermediate states like
$\pi\pi$ and $\rho\rho$, (2) ``$c\bar{c}$'' corresponding to intermediate
states like $D\bar{D}$ and $D^{*}\bar{D}^{*}$. Possibilities of using data to
identify these two sources are discussed and illustrated. Present data suggests
both sources may be significant.
| [
{
"created": "Wed, 22 Jun 2005 20:27:25 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2005 22:05:43 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Wolfenstein",
"Lincoln",
""
],
[
"Wu",
"Feng",
""
]
] | Two sources of strong phases in the decays $B$ to $\pi\pi$ are identified: (1) "quasi-elastic scattering" corresponding to intermediate states like $\pi\pi$ and $\rho\rho$, (2) ``$c\bar{c}$'' corresponding to intermediate states like $D\bar{D}$ and $D^{*}\bar{D}^{*}$. Possibilities of using data to identify these two sources are discussed and illustrated. Present data suggests both sources may be significant. |
2302.05358 | Fedor Lazarev | Konstantin Kouzakov, Fedor Lazarev and Alexander Studenikin | Elastic neutrino scattering on nuclear systems as a probe of neutrino
electromagnetic interactions | 4 pages, based on the presentation at the 41st International
Conference on High Energy Physics (ICHEP2022 6-13 July 2022, Bologna, Italy),
prepared for the ICHEP2022 proceedings | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We study the electromagnetic contribution to elastic neutrino-proton and
neutrino-neutron scattering processes. The neutrino electromagnetic charge,
magnetic, electric, and anapole form factors of both diagonal and transition
types in the mass basis are taken into account in the present formalism. When
treating the nucleon electromagnetic vertex, we take into account not only the
charge and magnetic form factors of a nucleon, but also its electric and
anapole form factors. We examine how the effects of the neutrino magnetic
moment can be disentangled from those of the strange quark contributions to the
nucleon weak neutral current form factors.
| [
{
"created": "Fri, 10 Feb 2023 16:19:43 GMT",
"version": "v1"
}
] | 2023-02-13 | [
[
"Kouzakov",
"Konstantin",
""
],
[
"Lazarev",
"Fedor",
""
],
[
"Studenikin",
"Alexander",
""
]
] | We study the electromagnetic contribution to elastic neutrino-proton and neutrino-neutron scattering processes. The neutrino electromagnetic charge, magnetic, electric, and anapole form factors of both diagonal and transition types in the mass basis are taken into account in the present formalism. When treating the nucleon electromagnetic vertex, we take into account not only the charge and magnetic form factors of a nucleon, but also its electric and anapole form factors. We examine how the effects of the neutrino magnetic moment can be disentangled from those of the strange quark contributions to the nucleon weak neutral current form factors. |
2403.08669 | Markus Mayer | Markus Mayer, Luciano Rezzolla, Hannah Elfner, Gabriele Inghirami,
Dirk H. Rischke | BHAC-QGP: three-dimensional MHD simulations of relativistic heavy-ion
collisions, II. Application to Au-Au collisions | 17 pages, 18 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We present BHAC-QGP, a new numerical code to simulate the evolution of matter
created in heavy-ion collisions. BHAC-QGP is based on the Black Hole Accretion
Code (BHAC), which has been designed to model astrophysical processes through
the solution of the equations of general-relativistic magnetohydrodynamics.
Like the mother code, BHAC-QGP uses Adaptive Mesh Refinement (AMR), which
allows for a dynamic adjustment of the resolution in regions of the
computational domain where a particularly high accuracy is needed. We here
discuss a number of applications of BHAC-QGP to Au-Au collisions at
Relativistic Heavy-Ion Collider (RHIC) energies and show that the code is able
to reproduce results of other simulations of these scenarios, but with much
higher accuracy.
| [
{
"created": "Wed, 13 Mar 2024 16:20:30 GMT",
"version": "v1"
}
] | 2024-03-14 | [
[
"Mayer",
"Markus",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Elfner",
"Hannah",
""
],
[
"Inghirami",
"Gabriele",
""
],
[
"Rischke",
"Dirk H.",
""
]
] | We present BHAC-QGP, a new numerical code to simulate the evolution of matter created in heavy-ion collisions. BHAC-QGP is based on the Black Hole Accretion Code (BHAC), which has been designed to model astrophysical processes through the solution of the equations of general-relativistic magnetohydrodynamics. Like the mother code, BHAC-QGP uses Adaptive Mesh Refinement (AMR), which allows for a dynamic adjustment of the resolution in regions of the computational domain where a particularly high accuracy is needed. We here discuss a number of applications of BHAC-QGP to Au-Au collisions at Relativistic Heavy-Ion Collider (RHIC) energies and show that the code is able to reproduce results of other simulations of these scenarios, but with much higher accuracy. |
1605.08011 | Walter T. Giele | Radja Boughezal, John M. Campbell, R. Keith Ellis, Christfried Focke,
Walter Giele, Xiaohui Liu, Frank Petriello and Ciaran Williams | Color singlet production at NNLO in MCFM | 31 pages, 10 figures, 11 Tables, Code can be downloaded <a href=
"html://mcfm.fnal.gov" > html://mcfm.fnal.gov </a> | null | 10.1140/epjc/s10052-016-4558-y | FERMILAB-PUB-16-120-T, IPPP/16/32 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the implementation of several color-singlet final-state processes
at Next-to-Next-to Leading Order (NNLO) accuracy in QCD to the publicly
available parton-level Monte Carlo program MCFM. Specifically we discuss the
processes $pp\rightarrow H$, $pp\rightarrow Z$, $pp\rightarrow W$,
$pp\rightarrow HZ$, $pp\rightarrow HW$ and $pp\rightarrow\gamma\gamma$. Decays
of the unstable bosons are fully included, resulting in a flexible fully
differential Monte Carlo code. The NNLO corrections have been calculated using
the non-local $N$-jettiness subtraction approach. Special attention is given to
the numerical aspects of running MCFM for these processes at this order. We pay
particular attention to the systematic uncertainties due to the power
corrections induced by the $N$-jettiness regularization scheme and the
evaluation time needed to run the hybrid openMP/MPI version of MCFM at NNLO on
multi-processor systems.
| [
{
"created": "Wed, 25 May 2016 19:16:50 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Boughezal",
"Radja",
""
],
[
"Campbell",
"John M.",
""
],
[
"Ellis",
"R. Keith",
""
],
[
"Focke",
"Christfried",
""
],
[
"Giele",
"Walter",
""
],
[
"Liu",
"Xiaohui",
""
],
[
"Petriello",
"Frank",
""
],
[
"Williams",
"Ciaran",
""
]
] | We present the implementation of several color-singlet final-state processes at Next-to-Next-to Leading Order (NNLO) accuracy in QCD to the publicly available parton-level Monte Carlo program MCFM. Specifically we discuss the processes $pp\rightarrow H$, $pp\rightarrow Z$, $pp\rightarrow W$, $pp\rightarrow HZ$, $pp\rightarrow HW$ and $pp\rightarrow\gamma\gamma$. Decays of the unstable bosons are fully included, resulting in a flexible fully differential Monte Carlo code. The NNLO corrections have been calculated using the non-local $N$-jettiness subtraction approach. Special attention is given to the numerical aspects of running MCFM for these processes at this order. We pay particular attention to the systematic uncertainties due to the power corrections induced by the $N$-jettiness regularization scheme and the evaluation time needed to run the hybrid openMP/MPI version of MCFM at NNLO on multi-processor systems. |
hep-ph/0010310 | Michael Chanowitz | Michael S. Chanowitz | New Physics and the Landau Pole | 26 pages, 5 figures | Phys.Rev.D63:076002,2001 | 10.1103/PhysRevD.63.076002 | LBNL-45962 | hep-ph hep-lat | null | In scalar field theories the Landau pole is an ultraviolet singularity in the
running coupling constant that indicates a mass scale at which the theory
breaks down and new physics must intervene. However, new physics at the pole
will in general affect the running of the low energy coupling constant, which
will in turn affect the location of the pole and the related upper limit
(``triviality'' bound) on the low energy coupling constant. If the new physics
is strongly coupled to the scalar fields these effects can be significant even
though they are power suppressed. We explore the possible range of such effects
by deriving the one loop renormalization group equations for an effective
scalar field theory with a dimension 6 operator representing the low energy
effects of the new physics. As an independent check we also consider a
renormalizable model of the high-scale physics constructed so that its low
energy limit coincides with the effective theory.
| [
{
"created": "Thu, 26 Oct 2000 19:47:36 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Chanowitz",
"Michael S.",
""
]
] | In scalar field theories the Landau pole is an ultraviolet singularity in the running coupling constant that indicates a mass scale at which the theory breaks down and new physics must intervene. However, new physics at the pole will in general affect the running of the low energy coupling constant, which will in turn affect the location of the pole and the related upper limit (``triviality'' bound) on the low energy coupling constant. If the new physics is strongly coupled to the scalar fields these effects can be significant even though they are power suppressed. We explore the possible range of such effects by deriving the one loop renormalization group equations for an effective scalar field theory with a dimension 6 operator representing the low energy effects of the new physics. As an independent check we also consider a renormalizable model of the high-scale physics constructed so that its low energy limit coincides with the effective theory. |
hep-ph/0209260 | Andrianov Alexander | A. A. Andrianov (1 and 2), V. A. Andrianov (1) and S. S. Afonin (1)
((1) St.Petersburg State University, (2) INFN, Sezione di Bologna) | QCD tests for Quasilocal Quark Model | 9 pages, Latex, Talk at 12th International Seminar on High Energy
Physics QUARKS'2002, Novgorod, Russia | null | null | null | hep-ph | null | We perform the QCD testing of the Quasilocal Quark Model (QQM) based on
Operator Product Expansion (OPE). The quark current correlators calculated in
framework of the model, are compared to their OPE in QCD at intermediate
energies. The QQM provides a reasonable resolution for mass spectrum of parity
doublers in scalar and vector meson channels.
| [
{
"created": "Mon, 23 Sep 2002 15:10:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Andrianov",
"A. A.",
"",
"1 and 2"
],
[
"Andrianov",
"V. A.",
"",
"St.Petersburg State University"
],
[
"Afonin",
"S. S.",
"",
"St.Petersburg State University"
]
] | We perform the QCD testing of the Quasilocal Quark Model (QQM) based on Operator Product Expansion (OPE). The quark current correlators calculated in framework of the model, are compared to their OPE in QCD at intermediate energies. The QQM provides a reasonable resolution for mass spectrum of parity doublers in scalar and vector meson channels. |
hep-ph/0209177 | Vladimir Smirnov | V.A. Smirnov | Analytical Evaluation of Double Boxes | 18 pages, LaTeX with axodraw.sty; Talk presented at the 36th Annual
Winter School on Nuclear and Particle Physics (Repino, Russia, 25 February -
03 March 2002) | null | null | null | hep-ph | null | Recent results on the analytical evaluation of double-box Feynman integrals
and the corresponding methods of evaluation are briefly reviewed.
| [
{
"created": "Mon, 16 Sep 2002 20:10:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Smirnov",
"V. A.",
""
]
] | Recent results on the analytical evaluation of double-box Feynman integrals and the corresponding methods of evaluation are briefly reviewed. |
0807.2006 | Jacques Distler | Jacques Distler and Daniel Robbins | General F-Term Gauge Mediation | 18 pages, LaTeX, using utarticle class, v2: Section on D-term
breaking added. Miscellaneous improvements in the prose | null | null | UTTG-07-08 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a model-independent formalism of gauge mediation, Meade, Seiberg, and Shih
have shown that hidden sector effects are captured by two-point correlation
functions of the gauge current superfields and that, generically, many of the
characteristic features of gauge mediated SUSY breaking do not survive. We
review the general story, particularly the way that the correlators enter the
low-energy effective action and give rise to soft-breaking terms. We then
specialize to the case where there is a small parameter, F/m^2, where m is the
mass scale characterizing the hidden sector, and F is the strength of the SUSY
breaking. To leading nontrivial order in this small parameter, we show that
many of the classic predictions of gauge mediated SUSY breaking are recovered.
| [
{
"created": "Sun, 13 Jul 2008 01:52:34 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jul 2008 17:35:13 GMT",
"version": "v2"
}
] | 2008-07-20 | [
[
"Distler",
"Jacques",
""
],
[
"Robbins",
"Daniel",
""
]
] | In a model-independent formalism of gauge mediation, Meade, Seiberg, and Shih have shown that hidden sector effects are captured by two-point correlation functions of the gauge current superfields and that, generically, many of the characteristic features of gauge mediated SUSY breaking do not survive. We review the general story, particularly the way that the correlators enter the low-energy effective action and give rise to soft-breaking terms. We then specialize to the case where there is a small parameter, F/m^2, where m is the mass scale characterizing the hidden sector, and F is the strength of the SUSY breaking. To leading nontrivial order in this small parameter, we show that many of the classic predictions of gauge mediated SUSY breaking are recovered. |
hep-ph/0308197 | Rabindra N. Mohapatra | H. S. Goh, R. N. Mohapatra and Siew-Phang Ng | Minimal SUSY SO(10) model and predictions for neutrino mixings and
leptonic CP violation | 22 pages, 6 figures | Phys.Rev.D68:115008,2003 | 10.1103/PhysRevD.68.115008 | UMD-PP-03-68 | hep-ph | null | We discuss a minimal Supersymmetric SO(10) model where B-L symmetry is broken
by a {\bf 126} dimensional Higgs multiplet which also contributes to fermion
masses in conjunction with a {\bf 10} dimensional superfield. This minimal
Higgs choice provides a partial unification of neutrino flavor structure with
that of quarks and has been shown to predict all three neutrino mixing angles
and the solar mass splitting in agreement with observations, provided one uses
the type II seesaw formula for neutrino masses. In this paper we generalize
this analysis to include arbitrary CP phases in couplings and vevs. We find
that (i) the predictions for neutrino mixings are similar with $U_{e3}\simeq
0.18$ as before and other parameters in a somewhat bigger range and (ii) that
to first order in the quark mixing parameter $\lambda$ (the Cabibbo angle), the
leptonic mixing matrix is CP conserving. We also find that in the absence of
any higher dimensional contributions to fermion masses, the CKM phase is
different from that of the standard model implying that there must be new
contributions to quark CP violation from the supersymmetry breaking sector.
Inclusion of higher dimensional terms however allows the standard model CKM
phase to be maintained.
| [
{
"created": "Tue, 19 Aug 2003 18:41:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Goh",
"H. S.",
""
],
[
"Mohapatra",
"R. N.",
""
],
[
"Ng",
"Siew-Phang",
""
]
] | We discuss a minimal Supersymmetric SO(10) model where B-L symmetry is broken by a {\bf 126} dimensional Higgs multiplet which also contributes to fermion masses in conjunction with a {\bf 10} dimensional superfield. This minimal Higgs choice provides a partial unification of neutrino flavor structure with that of quarks and has been shown to predict all three neutrino mixing angles and the solar mass splitting in agreement with observations, provided one uses the type II seesaw formula for neutrino masses. In this paper we generalize this analysis to include arbitrary CP phases in couplings and vevs. We find that (i) the predictions for neutrino mixings are similar with $U_{e3}\simeq 0.18$ as before and other parameters in a somewhat bigger range and (ii) that to first order in the quark mixing parameter $\lambda$ (the Cabibbo angle), the leptonic mixing matrix is CP conserving. We also find that in the absence of any higher dimensional contributions to fermion masses, the CKM phase is different from that of the standard model implying that there must be new contributions to quark CP violation from the supersymmetry breaking sector. Inclusion of higher dimensional terms however allows the standard model CKM phase to be maintained. |
2011.04685 | Dmitry Kalashnikov | Konstantin Belotsky and Ekaterina Esipova and Dmitriy Kalashnikov and
Andrei Letunov | Problems of the correspondence principle for the recombination cross
section in dark plasma | null | Proceedings to the 23rd Workshop What Comes Beyond the Standard
Models Bled, 2020, VOL. 21, NO. 2, page 77 | null | arXiv:2104.11081 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We raise the issues concerning correspondence principle in description of a
recombination of oppositely charged particles. These issues have come from
cosmological dark matter (DM) problem investigations. Particles possessing
Coulomb-like interaction are considered. Such Coulomb-like interaction between
DM particles is assumed though the problem seems to be more general. Analysis
showed that usage of different semiclassical approaches leads to the apparent
discrepancy between numbers of recombination acts. We attempted to find some
conditions under which classical cross-section (which relates to multiple soft
photon process) reduces to quantum one, which is obtained in semi-classical
approximation (Kramers' formula). We just draw attention to this and provide
some (not decisive) arguments.
| [
{
"created": "Mon, 9 Nov 2020 19:05:25 GMT",
"version": "v1"
}
] | 2022-04-21 | [
[
"Belotsky",
"Konstantin",
""
],
[
"Esipova",
"Ekaterina",
""
],
[
"Kalashnikov",
"Dmitriy",
""
],
[
"Letunov",
"Andrei",
""
]
] | We raise the issues concerning correspondence principle in description of a recombination of oppositely charged particles. These issues have come from cosmological dark matter (DM) problem investigations. Particles possessing Coulomb-like interaction are considered. Such Coulomb-like interaction between DM particles is assumed though the problem seems to be more general. Analysis showed that usage of different semiclassical approaches leads to the apparent discrepancy between numbers of recombination acts. We attempted to find some conditions under which classical cross-section (which relates to multiple soft photon process) reduces to quantum one, which is obtained in semi-classical approximation (Kramers' formula). We just draw attention to this and provide some (not decisive) arguments. |
0905.2056 | Jakub Wagner | B. Pire, L. Szymanowski, J. Wagner | Timelike Compton Scattering at LHC | To appear in the proceedings of Excited QCD, Zakopane, Poland, 8-14
Feb 2009 | Acta Phys.Polon.Supp.2:373,2009 | null | CPHT-PC035.0409 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exclusive photoproduction of dileptons, gamma N ->l+l- N, is and will be
measured in ultraperipheralcollisions at hadron colliders. We demonstrate that
the timelike deeply virtual Compton scattering (TCS) mechanism gamma q -> l+l-
q, where the lepton pair comes from the subprocess gamma q -> gamma* q,
dominates in some accessible kinematical regions, thus opening a new way to
study generalized parton distributions (GPD) in the nucleon at small
skewedness.
| [
{
"created": "Wed, 13 May 2009 10:26:49 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wagner",
"J.",
""
]
] | Exclusive photoproduction of dileptons, gamma N ->l+l- N, is and will be measured in ultraperipheralcollisions at hadron colliders. We demonstrate that the timelike deeply virtual Compton scattering (TCS) mechanism gamma q -> l+l- q, where the lepton pair comes from the subprocess gamma q -> gamma* q, dominates in some accessible kinematical regions, thus opening a new way to study generalized parton distributions (GPD) in the nucleon at small skewedness. |
hep-ph/0201109 | null | O.D.Chernavskaya, I.I.Royzen | From constituent quarks to hadrons in course of nuclear matter expansion | 12? pages, 3 figures (.gif), 1 table (table.tex) | null | null | null | hep-ph | null | The up-dated three-phase concept of nuclear matter evolution in course of
cooling down - from the phase of quark-qluon plasma (QGP) through the
intermediate phase allowing for massive constituent quarks (valons), pions and
kaons (QPK) to the phase of hadronic matter (H) - is exploited for the
treatment of relative hadronic yields in the central region of heavy ion
collisions. The most attention is paid to the description of the QPK-phase
which is argued to be a gaseous one and lasts until the valonic spacing
approaches the confinement radius (at the temperature about 110 MeV), when the
valons start fusing to be locked, in the end, within the hadrons. The hadronic
yields emerged from thermal treatment of QPK-phase and simple combinatorial
approach to the hadronization process are shown to fit the available
experimental data from AGS, SPS and RHIC quite well. This provides an
alternative insight into the real origin of the observed relative hadronic
yields which is (to a considerable extent) free of the well known puzzle
inherent in some conventional models where the early chemical freeze-out is
assumed: namely, why the gaseous thermal approach to actually tightly packed
(even overlapping) hadrons seems workable? Many predictions for the other
hadronic yields which could be observed at these machines as well as at LHC are
given.
| [
{
"created": "Sun, 13 Jan 2002 13:12:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chernavskaya",
"O. D.",
""
],
[
"Royzen",
"I. I.",
""
]
] | The up-dated three-phase concept of nuclear matter evolution in course of cooling down - from the phase of quark-qluon plasma (QGP) through the intermediate phase allowing for massive constituent quarks (valons), pions and kaons (QPK) to the phase of hadronic matter (H) - is exploited for the treatment of relative hadronic yields in the central region of heavy ion collisions. The most attention is paid to the description of the QPK-phase which is argued to be a gaseous one and lasts until the valonic spacing approaches the confinement radius (at the temperature about 110 MeV), when the valons start fusing to be locked, in the end, within the hadrons. The hadronic yields emerged from thermal treatment of QPK-phase and simple combinatorial approach to the hadronization process are shown to fit the available experimental data from AGS, SPS and RHIC quite well. This provides an alternative insight into the real origin of the observed relative hadronic yields which is (to a considerable extent) free of the well known puzzle inherent in some conventional models where the early chemical freeze-out is assumed: namely, why the gaseous thermal approach to actually tightly packed (even overlapping) hadrons seems workable? Many predictions for the other hadronic yields which could be observed at these machines as well as at LHC are given. |
2402.07725 | George Rupp | George Rupp | $\sigma(500)$ resonance pole positions as function of $m_\pi$: analysis
with a unitary coupled-channel model | 6 pages, 4 figures, LaTeX style of Acta Physica Polonica B, writeup
of talk by George Rupp at the Excited QCD 2024 Workshop, 14-20 January 2024
in Benasque, Spain | null | null | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Resonance pole positions of the $f_0(500)$ alias $\sigma(500)$ meson are
computed and plotted as a continuous function of pion mass in the framework of
a unitary and analytic coupled-channel model for scalar mesons as dynamical
$q\bar{q}$ states. The $\sigma$ is described with a light and a strange
$q\bar{q}$ seed, mixing with each other mainly through the common $\pi\pi$,
$K\bar{K}$, and $\eta\eta$ meson-meson channels. The few model parameters are
fitted to experimental $S$-wave $\pi\pi$ phase shifts up to 1 GeV, yielding, in
the case of the physical pion mass, resonance poles at $(460-i222)$ MeV for the
$\sigma(500)$ and $(978-i37)$ MeV for the $f_0(980)$. Resonance, bound-state,
and virtual-state pole trajectories are shown as a function of $m_\pi$ running
from 139.57 MeV to 1 GeV. These are compared to recent lattice QCD computations
that use interpolating fields corresponding to the model's channels, i.e., for
a few discrete $m_\pi $values.
| [
{
"created": "Mon, 12 Feb 2024 15:38:31 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Rupp",
"George",
""
]
] | Resonance pole positions of the $f_0(500)$ alias $\sigma(500)$ meson are computed and plotted as a continuous function of pion mass in the framework of a unitary and analytic coupled-channel model for scalar mesons as dynamical $q\bar{q}$ states. The $\sigma$ is described with a light and a strange $q\bar{q}$ seed, mixing with each other mainly through the common $\pi\pi$, $K\bar{K}$, and $\eta\eta$ meson-meson channels. The few model parameters are fitted to experimental $S$-wave $\pi\pi$ phase shifts up to 1 GeV, yielding, in the case of the physical pion mass, resonance poles at $(460-i222)$ MeV for the $\sigma(500)$ and $(978-i37)$ MeV for the $f_0(980)$. Resonance, bound-state, and virtual-state pole trajectories are shown as a function of $m_\pi$ running from 139.57 MeV to 1 GeV. These are compared to recent lattice QCD computations that use interpolating fields corresponding to the model's channels, i.e., for a few discrete $m_\pi $values. |
0809.0425 | Gustavo Gil da Silveira | M.B. Gay Ducati, G.G. Silveira | Diffractive Higgs boson photoproduction in $\gamma p$ process | 12 pages, 12 figures, corrected typos and grammar | Phys.Rev.D78:113005,2008 | 10.1103/PhysRevD.78.113005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore an alternative process for the diffractive Higgs boson production
in peripheral pp collisions arising from Double Pomeron Exchange in
photon-proton interaction. We introduce the impact factor formalism in order to
enable the gluon ladder exchange in the photon-proton subprocess, and to permit
the central Higgs production. The event rate for the diffractive Higgs
production in central rapidity is estimated to be about 0.6 pb at Tevatron and
LHC energies. This result is higher than predictions from other approaches for
diffractive Higgs production, showing that the alternative production process
leads to an enhanced signal for the detection of the Higgs boson at hadron
colliders. Our results are compared to those obtained from a similar approach
proposed by the Durham group. In this way we may examine the future
developments in its application to pp and AA collisions.
| [
{
"created": "Tue, 2 Sep 2008 12:30:02 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Dec 2008 16:22:06 GMT",
"version": "v2"
}
] | 2008-12-30 | [
[
"Ducati",
"M. B. Gay",
""
],
[
"Silveira",
"G. G.",
""
]
] | We explore an alternative process for the diffractive Higgs boson production in peripheral pp collisions arising from Double Pomeron Exchange in photon-proton interaction. We introduce the impact factor formalism in order to enable the gluon ladder exchange in the photon-proton subprocess, and to permit the central Higgs production. The event rate for the diffractive Higgs production in central rapidity is estimated to be about 0.6 pb at Tevatron and LHC energies. This result is higher than predictions from other approaches for diffractive Higgs production, showing that the alternative production process leads to an enhanced signal for the detection of the Higgs boson at hadron colliders. Our results are compared to those obtained from a similar approach proposed by the Durham group. In this way we may examine the future developments in its application to pp and AA collisions. |
2212.09755 | Alberto Salvio | Alberto Salvio | Thermal Production of Massless Dark Photons | 16 pages, 4 figures; v2: comments on the validity of these
calculations for massive dark photons added, published version | JCAP 07 (2023) 035 | 10.1088/1475-7516/2023/07/035 | null | hep-ph astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | A dark photon is predicted by several well-motivated Standard Model
extensions and UV completions. Here the most general effective field theory up
to dimension-six operators describing the interactions of a massless dark
photon with all Standard Model particles is considered. This captures the
predictions of a generic model featuring this type of vector boson at
sufficiently low energies. In such framework the thermal production rate of
dark photons is computed at leading order, including the contributions of all
SM particles. The corresponding cosmological yield of the dark photon and its
contribution to the effective number of neutrinos are also calculated. These
predictions satisfy the current observational bounds and will be tested by
future measurements.
| [
{
"created": "Mon, 19 Dec 2022 19:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2023 13:55:27 GMT",
"version": "v2"
}
] | 2023-07-13 | [
[
"Salvio",
"Alberto",
""
]
] | A dark photon is predicted by several well-motivated Standard Model extensions and UV completions. Here the most general effective field theory up to dimension-six operators describing the interactions of a massless dark photon with all Standard Model particles is considered. This captures the predictions of a generic model featuring this type of vector boson at sufficiently low energies. In such framework the thermal production rate of dark photons is computed at leading order, including the contributions of all SM particles. The corresponding cosmological yield of the dark photon and its contribution to the effective number of neutrinos are also calculated. These predictions satisfy the current observational bounds and will be tested by future measurements. |
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