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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1609.01307 | Michael Petersen | Michael S. Petersen, Neal Katz, Martin D. Weinberg | The Dynamical Response of Dark Matter to Galaxy Evolution Affects
Direct-Detection Experiments | 16 pages, 7 figures, submitted to Phys Rev D | null | 10.1103/PhysRevD.94.123013 | null | hep-ph astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Over a handful of rotation periods, dynamical processes in barred galaxies
induce non-axisymmetric structure in dark matter halos. Using n-body
simulations of a Milky Way-like barred galaxy, we identify both a trapped
dark-matter component, a shadow bar, and a strong response wake in the
dark-matter distribution that affects the predicted dark-matter detection rates
for current experiments. The presence of a baryonic disk together with
well-known dynamical processes (e.g. spiral structure and bar instabilities)
increase the dark matter density in the disk plane. We find that the magnitude
of the combined stellar and shadow bar evolution, when isolated from the effect
of the axisymmetric gravitational potential of the disk, accounts for >30% of
this overall increase in disk-plane density. This is significantly larger that
of previously claimed deviations from the standard halo model. The dark-matter
density and kinematic wakes driven by the Milky Way bar increase the
detectability of dark matter overall, especially for the experiments with
higher $v_{min}$. These astrophysical features increase the detection rate by
more than a factor of two when compared to the standard halo model and by a
factor of ten for experiments with high minimum recoil energy thresholds. These
same features increase (decrease) the annual modulation for low (high) minimum
recoil energy experiments. We present physical arguments for why these dynamics
are generic for barred galaxies such as the Milky Way rather than contingent on
a specific galaxy model.
| [
{
"created": "Mon, 5 Sep 2016 20:05:44 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Petersen",
"Michael S.",
""
],
[
"Katz",
"Neal",
""
],
[
"Weinberg",
"Martin D.",
""
]
] | Over a handful of rotation periods, dynamical processes in barred galaxies induce non-axisymmetric structure in dark matter halos. Using n-body simulations of a Milky Way-like barred galaxy, we identify both a trapped dark-matter component, a shadow bar, and a strong response wake in the dark-matter distribution that affects the predicted dark-matter detection rates for current experiments. The presence of a baryonic disk together with well-known dynamical processes (e.g. spiral structure and bar instabilities) increase the dark matter density in the disk plane. We find that the magnitude of the combined stellar and shadow bar evolution, when isolated from the effect of the axisymmetric gravitational potential of the disk, accounts for >30% of this overall increase in disk-plane density. This is significantly larger that of previously claimed deviations from the standard halo model. The dark-matter density and kinematic wakes driven by the Milky Way bar increase the detectability of dark matter overall, especially for the experiments with higher $v_{min}$. These astrophysical features increase the detection rate by more than a factor of two when compared to the standard halo model and by a factor of ten for experiments with high minimum recoil energy thresholds. These same features increase (decrease) the annual modulation for low (high) minimum recoil energy experiments. We present physical arguments for why these dynamics are generic for barred galaxies such as the Milky Way rather than contingent on a specific galaxy model. |
1306.5218 | Jinfeng Liao | Jinfeng Liao | The Chrial Magnetic Wave and Strong Field Effects in Heavy Ion
Collisions | 8 pages, 4 figures, invited talk at the 8th International Workshop on
Critical Point and Onset of Deconfinement (CPOD2013), March 11-15, Napa,
California, USA | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A number of recent progresses in the study of strong field effects in heavy
ion collisions are discussed here: 1) the Chiral Magnetic Wave (CMW) and its
experimental manifestation via splitting of positive/negative pions' elliptic
flow; 2) the event-by-event azimuthal fluctuations of strong EM fields and its
correlations with matter geometry; 3) a new mechanism for generating axial
current in external electric field, the Chiral Electric Separation Effect
(CESE).
| [
{
"created": "Fri, 21 Jun 2013 19:17:29 GMT",
"version": "v1"
}
] | 2013-06-24 | [
[
"Liao",
"Jinfeng",
""
]
] | A number of recent progresses in the study of strong field effects in heavy ion collisions are discussed here: 1) the Chiral Magnetic Wave (CMW) and its experimental manifestation via splitting of positive/negative pions' elliptic flow; 2) the event-by-event azimuthal fluctuations of strong EM fields and its correlations with matter geometry; 3) a new mechanism for generating axial current in external electric field, the Chiral Electric Separation Effect (CESE). |
hep-ph/0208113 | Michael Czakon | M. Awramik and M. Czakon | Complete Two Loop Bosonic Contributions to the Muon Lifetime in the
Standard Model | 4 pages, 3 figures, references added, final version to appear in
Phys. Rev. Lett | Phys.Rev.Lett.89:241801,2002 | 10.1103/PhysRevLett.89.241801 | null | hep-ph | null | The last missing correction to the muon lifetime in the Standard Model at
O(alpha^2) coming from gauge and Higgs boson loops is presented. The associated
contribution to the parameter Delta r in the on-shell scheme ranges from 6
times 10^{-5} to -4 times 10^{-5} for Higgs boson masses from 100 GeV to 1 TeV.
This result translates into a shift of the W boson mass which does not exceed
+/- 1 MeV in the same range and amounts in particular to approximately -0.8 MeV
for a 115 GeV Higgs boson.
| [
{
"created": "Mon, 12 Aug 2002 17:34:34 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Nov 2002 16:41:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Awramik",
"M.",
""
],
[
"Czakon",
"M.",
""
]
] | The last missing correction to the muon lifetime in the Standard Model at O(alpha^2) coming from gauge and Higgs boson loops is presented. The associated contribution to the parameter Delta r in the on-shell scheme ranges from 6 times 10^{-5} to -4 times 10^{-5} for Higgs boson masses from 100 GeV to 1 TeV. This result translates into a shift of the W boson mass which does not exceed +/- 1 MeV in the same range and amounts in particular to approximately -0.8 MeV for a 115 GeV Higgs boson. |
2105.14061 | Tatsu Takeuchi | Patrick Huber, Hisakazu Minakata, Djordje Minic, Rebekah Pestes, Tatsu
Takeuchi | Neutrino Oscillations at JUNO, the Born Rule, and Sorkin's Triple Path
Interference | 7 pages, 4 figures, uses revtex4-2 | null | 10.1103/PhysRevD.105.115013 | null | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that neutrino oscillations at JUNO offer a unique opportunity to
study Sorkin's triple-path interference, which is predicted to be zero in
canonical quantum mechanics by virtue of the Born rule. In particular, we
compute the expected bounds on triple-path interference at JUNO and demonstrate
that they are comparable to those already available from electromagnetic
probes. Furthermore, the neutrino probe of the Born rule is much more direct
due to an intrinsic independence from any boundary conditions, whereas such
dependence on boundary conditions is always present in the case of
electromagnetic probes. Thus, neutrino oscillations present an ideal probe of
this aspect of the foundations of quantum mechanics.
| [
{
"created": "Fri, 28 May 2021 19:00:00 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Huber",
"Patrick",
""
],
[
"Minakata",
"Hisakazu",
""
],
[
"Minic",
"Djordje",
""
],
[
"Pestes",
"Rebekah",
""
],
[
"Takeuchi",
"Tatsu",
""
]
] | We argue that neutrino oscillations at JUNO offer a unique opportunity to study Sorkin's triple-path interference, which is predicted to be zero in canonical quantum mechanics by virtue of the Born rule. In particular, we compute the expected bounds on triple-path interference at JUNO and demonstrate that they are comparable to those already available from electromagnetic probes. Furthermore, the neutrino probe of the Born rule is much more direct due to an intrinsic independence from any boundary conditions, whereas such dependence on boundary conditions is always present in the case of electromagnetic probes. Thus, neutrino oscillations present an ideal probe of this aspect of the foundations of quantum mechanics. |
1510.03830 | Tina Katharina Herbst | Tina K. Herbst, Jan Luecker, Jan M. Pawlowski | Confinement order parameters and fluctuations | 14 pages, 7 figures | null | null | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study order parameters for the confinement-deconfinement phase transition
related to the Polyakov-loop variable. The functional renormalisation group is
used to compute these order parameters in a unified, non-perturbative continuum
approach. Our result for the expectation value of the traced Polyakov loop
agrees quantitatively with the lattice result. Furthermore, we discuss how this
order parameter differs from the standard continuum Polyakov loop. For
temperatures close to the phase transition temperature there are significant
deviations. We argue that these deviations are of crucial importance for QCD
effective models, which usually implicitly rely on a Gaussian approximation
neglecting this difference.
| [
{
"created": "Tue, 13 Oct 2015 19:25:50 GMT",
"version": "v1"
}
] | 2015-10-14 | [
[
"Herbst",
"Tina K.",
""
],
[
"Luecker",
"Jan",
""
],
[
"Pawlowski",
"Jan M.",
""
]
] | We study order parameters for the confinement-deconfinement phase transition related to the Polyakov-loop variable. The functional renormalisation group is used to compute these order parameters in a unified, non-perturbative continuum approach. Our result for the expectation value of the traced Polyakov loop agrees quantitatively with the lattice result. Furthermore, we discuss how this order parameter differs from the standard continuum Polyakov loop. For temperatures close to the phase transition temperature there are significant deviations. We argue that these deviations are of crucial importance for QCD effective models, which usually implicitly rely on a Gaussian approximation neglecting this difference. |
1210.0411 | Boris Kopeliovich | B. Z. Kopeliovich, I. K. Potashnikova, Ivan Schmidt and M. Siddikov | Incurable Adler relation for soft neutrino interactions | 8 pages, 5 figures. Ivited talk presented by B.Z.K. at International
Conference on New Frontiers in Physics, Crete, June 10-16, 2012 | null | null | USM-TH-306 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Adler relation (AR), which bridges soft interactions of neutrinos and
pions, might look as a manifestation of pion dominance. However neutrino cannot
fluctuate to a pion because of lepton current conservation, instead it
interacts via much heavier hadronic components. This fact leads to nontrivial
relations between interaction amplitudes of different hadronic species, in
particular, it links diagonal and off-diagonal diffractive interactions of
pions. Absorptive corrections break these relations making the AR impossible to
hold universally, i.e. for any target and at any energy. We predict a dramatic
breakdown of the AR for coherent neutrino-production of pions on nuclei at all
energies.
| [
{
"created": "Mon, 1 Oct 2012 14:18:31 GMT",
"version": "v1"
}
] | 2012-10-02 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Potashnikova",
"I. K.",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Siddikov",
"M.",
""
]
] | The Adler relation (AR), which bridges soft interactions of neutrinos and pions, might look as a manifestation of pion dominance. However neutrino cannot fluctuate to a pion because of lepton current conservation, instead it interacts via much heavier hadronic components. This fact leads to nontrivial relations between interaction amplitudes of different hadronic species, in particular, it links diagonal and off-diagonal diffractive interactions of pions. Absorptive corrections break these relations making the AR impossible to hold universally, i.e. for any target and at any energy. We predict a dramatic breakdown of the AR for coherent neutrino-production of pions on nuclei at all energies. |
hep-ph/9609469 | Stefan Groote | S. Groote, J.G. K\"orner and O.I. Yakovlev | QCD Sum Rules for Heavy Baryons at Next-to-Leading Order in alpha_s | 18 pages, LaTeX, 3 figures are included in PostScript format | Phys. Rev. D 55, 3016 (1997) | 10.1103/PhysRevD.55.3016 | MZ-TH/96-21 | hep-ph | null | We derive QCD sum rules for heavy baryons at leading order in $1/m_Q$ and at
next-to-leading order in $\alpha_s$. The calculation involves the evaluation of
four different perturbative three-loop diagrams which determine the
$\alpha_s$-corrections to the Wilson coefficients of the leading term in the
Operator Product Expansion (OPE). From the sum rules we obtain estimates for
the masses and the residues of the heavy baryons $\Lambda_Q$ and $\Sigma_Q$.
The perturbative $O(\alpha_s)$ corrections to the leading order spectral
function amount to about $100%$, and they shift the calculated values for the
baryon masses slightly upward. The residues are shifted upward by about
$20-50%$. For the bound state energy $\bar\Lambda$ given by the difference of
the heavy baryon mass and the pole mass of the heavy quark $m_Q$ we obtain
$m_{\Lambda_Q}-m_Q=780 MeV$ and $m_{\Sigma_Q}-m_Q=950 MeV$. For the residues we
find $|F_\Lambda|=0.028 GeV^3$ and $|F_\Sigma|=0.039 GeV^3$.
| [
{
"created": "Wed, 25 Sep 1996 13:15:57 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Yakovlev",
"O. I.",
""
]
] | We derive QCD sum rules for heavy baryons at leading order in $1/m_Q$ and at next-to-leading order in $\alpha_s$. The calculation involves the evaluation of four different perturbative three-loop diagrams which determine the $\alpha_s$-corrections to the Wilson coefficients of the leading term in the Operator Product Expansion (OPE). From the sum rules we obtain estimates for the masses and the residues of the heavy baryons $\Lambda_Q$ and $\Sigma_Q$. The perturbative $O(\alpha_s)$ corrections to the leading order spectral function amount to about $100%$, and they shift the calculated values for the baryon masses slightly upward. The residues are shifted upward by about $20-50%$. For the bound state energy $\bar\Lambda$ given by the difference of the heavy baryon mass and the pole mass of the heavy quark $m_Q$ we obtain $m_{\Lambda_Q}-m_Q=780 MeV$ and $m_{\Sigma_Q}-m_Q=950 MeV$. For the residues we find $|F_\Lambda|=0.028 GeV^3$ and $|F_\Sigma|=0.039 GeV^3$. |
hep-ph/0010293 | Thorsten Wengler | Thorsten Wengler, Albert De Roeck | The gluon content of the photon from di-jet production at the
photon-photon collider | revised version with minor text changes and one figure replaced | Nucl.Instrum.Meth.A472:217-221,2001 | 10.1016/S0168-9002(01)01186-X | null | hep-ph | null | A study of di-jet measurements at a future photon collider is reported. The
sensitivity to extract the gluon distribution is discussed. The results are
compared with calculations for a linear e+e- collider.
| [
{
"created": "Wed, 25 Oct 2000 15:09:37 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Nov 2000 20:54:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wengler",
"Thorsten",
""
],
[
"De Roeck",
"Albert",
""
]
] | A study of di-jet measurements at a future photon collider is reported. The sensitivity to extract the gluon distribution is discussed. The results are compared with calculations for a linear e+e- collider. |
1602.01801 | Shao-Feng Ge | Shao-Feng Ge, Hong-Jian He, Jing Ren, Zhong-Zhi Xianyu | Realizing Dark Matter and Higgs Inflation in Light of LHC Diphoton
Excess | Phys.Lett.B Final Version. 16pp (7 Figs + 2 Tables). Only minor text
refinements, references added | Phys. Lett. B 757 (2016) 480-492 | 10.1016/j.physletb.2016.04.008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LHC Run-2 has provided intriguing di-photon signals of a new resonance around
750GeV, which, if not due to statistical fluctuations, must call for new
physics beyond the standard model (SM) at TeV scale. We propose a minimal
extension of the SM with a complex singlet scalar $\mathcal{S}$ and a doublet
of vector-like quarks. The scalar sector respects CP symmetry, with its CP-odd
imaginary component $\chi$ providing a natural dark matter (DM) candidate. The
real component of $\mathcal{S}$ serves as the new resonance (750GeV) and
explains the diphoton excess of the LHC Run-2. The new scalar degrees of
freedom of $\mathcal{S}$ help to stabilize the Higgs vacuum, and can realize
the Higgs inflation around GUT scale, consistent with the current cosmology
observations. We construct two representative samples A and B of our model for
demonstration. We study the mono-jet signals of the DM production from
invisible decays Re$(\mathcal{S}) \to \chi\chi$ at the LHC Run-2. We further
derive the DM relic density bound, and analyze the constraints from direct and
indirect DM detections.
| [
{
"created": "Thu, 4 Feb 2016 19:32:37 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 2016 16:09:25 GMT",
"version": "v2"
}
] | 2016-05-02 | [
[
"Ge",
"Shao-Feng",
""
],
[
"He",
"Hong-Jian",
""
],
[
"Ren",
"Jing",
""
],
[
"Xianyu",
"Zhong-Zhi",
""
]
] | LHC Run-2 has provided intriguing di-photon signals of a new resonance around 750GeV, which, if not due to statistical fluctuations, must call for new physics beyond the standard model (SM) at TeV scale. We propose a minimal extension of the SM with a complex singlet scalar $\mathcal{S}$ and a doublet of vector-like quarks. The scalar sector respects CP symmetry, with its CP-odd imaginary component $\chi$ providing a natural dark matter (DM) candidate. The real component of $\mathcal{S}$ serves as the new resonance (750GeV) and explains the diphoton excess of the LHC Run-2. The new scalar degrees of freedom of $\mathcal{S}$ help to stabilize the Higgs vacuum, and can realize the Higgs inflation around GUT scale, consistent with the current cosmology observations. We construct two representative samples A and B of our model for demonstration. We study the mono-jet signals of the DM production from invisible decays Re$(\mathcal{S}) \to \chi\chi$ at the LHC Run-2. We further derive the DM relic density bound, and analyze the constraints from direct and indirect DM detections. |
1310.4422 | Borut Bajc | Borut Bajc and Vasja Susi\v{c} | A realistic renormalizable supersymmetric E6 model | 8 pages, invited talk presented by B.B. at the theory workshop on
"Neutrino Physics and Astrophysics", CETUP* 2013 program, July 15 - July 26,
2013, Lead, South Dakota. To be published in the Proceedings | null | 10.1063/1.4883423 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A complete realistic model based on the supersymmetric version of $E_6$ is
presented. It consists of three copies of matter 27, and a Higgs sector made of
$2\times(27+\bar{27})+351'+\bar{351'}$ representations. An analytic solution to
the equations of motion is found which spontaneously breaks the gauge group
into the Standard Model. The light fermion mass matrices are written down
explicitly as non-linear functions of three Yukawa matrices. This contribution
is based on Ref. [1].
| [
{
"created": "Wed, 16 Oct 2013 15:42:36 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Bajc",
"Borut",
""
],
[
"Susič",
"Vasja",
""
]
] | A complete realistic model based on the supersymmetric version of $E_6$ is presented. It consists of three copies of matter 27, and a Higgs sector made of $2\times(27+\bar{27})+351'+\bar{351'}$ representations. An analytic solution to the equations of motion is found which spontaneously breaks the gauge group into the Standard Model. The light fermion mass matrices are written down explicitly as non-linear functions of three Yukawa matrices. This contribution is based on Ref. [1]. |
hep-ph/0310151 | Heather E. Logan | Heather E. Logan (Wisconsin) | Little Higgs Phenomenology | 3 pages, 2 figures, talk given at EPS 2003, Aachen, Germany, July
2003 | Eur.Phys.J.C33:s729-s731,2004 | 10.1140/epjcd/s2003-03-805-9 | null | hep-ph | null | Recently a new class of models has emerged that addresses the naturalness
problem of a light Higgs boson. In these ''little Higgs'' models, the Standard
Model Higgs boson is a pseudo-Nambu-Goldstone boson of an approximate global
symmetry. The Higgs boson acquires mass radiatively only through ''collective
breaking'' of the global symmetry, so that more than one interaction is
required to give the Higgs a mass. This protects the Higgs mass from receiving
quadratically divergent radiative corrections at one-loop. These models contain
new vector bosons, fermions and scalars at the TeV scale that cancel the
quadratic divergences in the Higgs mass due to the Standard Model gauge, top
quark, and Higgs boson loops. In this talk I review the phenomenology of the
little Higgs models, focusing on collider signatures and electroweak precision
constraints.
| [
{
"created": "Mon, 13 Oct 2003 16:40:45 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Logan",
"Heather E.",
"",
"Wisconsin"
]
] | Recently a new class of models has emerged that addresses the naturalness problem of a light Higgs boson. In these ''little Higgs'' models, the Standard Model Higgs boson is a pseudo-Nambu-Goldstone boson of an approximate global symmetry. The Higgs boson acquires mass radiatively only through ''collective breaking'' of the global symmetry, so that more than one interaction is required to give the Higgs a mass. This protects the Higgs mass from receiving quadratically divergent radiative corrections at one-loop. These models contain new vector bosons, fermions and scalars at the TeV scale that cancel the quadratic divergences in the Higgs mass due to the Standard Model gauge, top quark, and Higgs boson loops. In this talk I review the phenomenology of the little Higgs models, focusing on collider signatures and electroweak precision constraints. |
hep-ph/9502213 | Bonnie Friedman | Xiangdong Ji (MIT) | BREAKUP OF HADRON MASSES AND ENERGY-MOMENTUM TENSOR OF QCD | 21 pages, ReVTeX | Phys.Rev. D52 (1995) 271-281 | 10.1103/PhysRevD.52.271 | MIT-CTP-2407 | hep-ph hep-th | null | Hadron masses are shown to be separable in QCD into contributions of quark
and gluon kinetic and potential energies, quark masses, and the trace anomaly.
The separation is based on a study of the structure of the QCD energy-momentum
tensor and its matrix elements in hadron states. The paper contains two parts.
In the first part, a detailed discussion of the renormalization properties of
the energy-momentum tensor is given. In the second part, a mass separation
formula is derived and then applied to the nucleon, pion, and the QCD vacuum.
Implications of the results on hadron structure and non-perturbative QCD
dynamics are discussed.
| [
{
"created": "Wed, 1 Feb 1995 20:56:20 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Ji",
"Xiangdong",
"",
"MIT"
]
] | Hadron masses are shown to be separable in QCD into contributions of quark and gluon kinetic and potential energies, quark masses, and the trace anomaly. The separation is based on a study of the structure of the QCD energy-momentum tensor and its matrix elements in hadron states. The paper contains two parts. In the first part, a detailed discussion of the renormalization properties of the energy-momentum tensor is given. In the second part, a mass separation formula is derived and then applied to the nucleon, pion, and the QCD vacuum. Implications of the results on hadron structure and non-perturbative QCD dynamics are discussed. |
2206.15252 | Sudhansu Biswal S. | Sudhansu S. Biswal, Sushree S. Mishra and K. Sridhar | $\chi_c$ production in modified NRQCD | 7 pages, 3 figures | null | 10.1016/j.physletb.2022.137490 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous paper, we had modified Non-Relativistic QCD as it applies to
quarkonium production by taking into account the effect of perturbative
soft-gluon emission from the colour-octet quarkonium states. We tested the
model by fitting the unknown non-perturbative parameter in the model from
Tevatron data and using that to make parameter-free predictions for $J/\psi$
and $\psi '$ production at the LHC. In this paper, we study $\chi_c$
production: we fit as before the unknown matrix-element using data from
Tevatron. We, then, extend the results of the previous paper for $J/\psi$
production by calculating the effect of $\chi_c$ feed-down to the $J/\psi$
cross-section, which, by comparing with CMS results at $\sqrt{s}=$ 13 TeV, we
demonstrate to be small. We have also computed $\chi_c^1$ and $\chi_c^2$ at
$\sqrt{s}=$7 TeV and find excellent agreement with data from the ATLAS
experiment.
| [
{
"created": "Thu, 30 Jun 2022 13:00:56 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Biswal",
"Sudhansu S.",
""
],
[
"Mishra",
"Sushree S.",
""
],
[
"Sridhar",
"K.",
""
]
] | In a previous paper, we had modified Non-Relativistic QCD as it applies to quarkonium production by taking into account the effect of perturbative soft-gluon emission from the colour-octet quarkonium states. We tested the model by fitting the unknown non-perturbative parameter in the model from Tevatron data and using that to make parameter-free predictions for $J/\psi$ and $\psi '$ production at the LHC. In this paper, we study $\chi_c$ production: we fit as before the unknown matrix-element using data from Tevatron. We, then, extend the results of the previous paper for $J/\psi$ production by calculating the effect of $\chi_c$ feed-down to the $J/\psi$ cross-section, which, by comparing with CMS results at $\sqrt{s}=$ 13 TeV, we demonstrate to be small. We have also computed $\chi_c^1$ and $\chi_c^2$ at $\sqrt{s}=$7 TeV and find excellent agreement with data from the ATLAS experiment. |
hep-ph/0412179 | Fabian Brau | Fabian Brau and Claude Semay | Light Meson Spectra and Instanton Induced Forces | 14 pages | Phys.Rev. D58 (1998) 034015 | 10.1103/PhysRevD.58.034015 | null | hep-ph | null | The spinless Salpeter equation supplemented by an instanton induced force is
used to describe the spectra of light mesons, including the pseudoscalar ones.
The coupling constants of the instanton induced potential, as well as the quark
constituent masses are not treated as simple free parameters but are calculated
from the underlying instanton theory. Quite good results are obtained provided
the quark are considered as effective degrees of freedom with a finite size. A
further test of the model is performed by calculating the electromagnetic mass
differences between S-wave mesons.
| [
{
"created": "Tue, 14 Dec 2004 13:42:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brau",
"Fabian",
""
],
[
"Semay",
"Claude",
""
]
] | The spinless Salpeter equation supplemented by an instanton induced force is used to describe the spectra of light mesons, including the pseudoscalar ones. The coupling constants of the instanton induced potential, as well as the quark constituent masses are not treated as simple free parameters but are calculated from the underlying instanton theory. Quite good results are obtained provided the quark are considered as effective degrees of freedom with a finite size. A further test of the model is performed by calculating the electromagnetic mass differences between S-wave mesons. |
1604.01553 | En Wang | Yan-Yan Wang, Qi-Fang L\"u, En Wang, De-Min li | Role of $Y(4630)$ in the $p\bar{p}\rightarrow\Lambda_c\bar{\Lambda}_c$
reaction near threshold | 5 pages, 3figures | Phys. Rev. D 94, 014025 (2016) | 10.1103/PhysRevD.94.014025 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the charmed baryon production reaction
$p\bar{p}\rightarrow\Lambda_c\bar{\Lambda}_c$ in an effective Lagrangian
approach. Besides the $t$-channel $D^0$ and $D^{*0}$ mesons exchanges, the
$s$-channel $Y(4630)$ meson exchange is taken into account. For the total cross
sections, the $D^0$ and $D^{*0}$ mesons provide minor background contributions,
while the $Y(4630)$ state gives a clear peak structure with the magnitude of 10
$\mu$b at center of mass energy 4.63 GeV. Basing on the results, we suggest
that the reaction of $p\bar{p}\rightarrow\Lambda_c\bar{\Lambda}_c$ can be used
to search for the $1^{--}$ charmonium-like $Y(4630)$ state, and our predictions
can be tested in future by the $\rm{\bar PANDA}$ facility.
| [
{
"created": "Wed, 6 Apr 2016 09:29:23 GMT",
"version": "v1"
}
] | 2016-08-05 | [
[
"Wang",
"Yan-Yan",
""
],
[
"Lü",
"Qi-Fang",
""
],
[
"Wang",
"En",
""
],
[
"li",
"De-Min",
""
]
] | We investigate the charmed baryon production reaction $p\bar{p}\rightarrow\Lambda_c\bar{\Lambda}_c$ in an effective Lagrangian approach. Besides the $t$-channel $D^0$ and $D^{*0}$ mesons exchanges, the $s$-channel $Y(4630)$ meson exchange is taken into account. For the total cross sections, the $D^0$ and $D^{*0}$ mesons provide minor background contributions, while the $Y(4630)$ state gives a clear peak structure with the magnitude of 10 $\mu$b at center of mass energy 4.63 GeV. Basing on the results, we suggest that the reaction of $p\bar{p}\rightarrow\Lambda_c\bar{\Lambda}_c$ can be used to search for the $1^{--}$ charmonium-like $Y(4630)$ state, and our predictions can be tested in future by the $\rm{\bar PANDA}$ facility. |
1205.5254 | Eligio Lisi | G. L. Fogli, E. Lisi, A. Marrone, D. Montanino, A. Palazzo, A. M.
Rotunno | Global analysis of neutrino masses, mixings and phases: entering the era
of leptonic CP violation searches | Updated version, including recent data released at the Neutrino 2012
Conference. Some references added | null | 10.1103/PhysRevD.86.013012 | null | hep-ph astro-ph.CO hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a global analysis of neutrino oscillation data, including
high-precision measurements of the neutrino mixing angle theta_13 at reactor
experiments, which have confirmed previous indications in favor of theta_13>0.
Recent data presented at the Neutrino 2012 Conference are also included. We
focus on the correlations between theta_13 and the mixing angle theta_23, as
well as between theta_13 and the neutrino CP-violation phase delta. We find
interesting indications for theta_23< pi/4 and possible hints for delta ~ pi,
with no significant difference between normal and inverted mass hierarchy.
| [
{
"created": "Wed, 23 May 2012 19:12:42 GMT",
"version": "v1"
},
{
"created": "Fri, 25 May 2012 17:18:20 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Jun 2012 16:19:08 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Fogli",
"G. L.",
""
],
[
"Lisi",
"E.",
""
],
[
"Marrone",
"A.",
""
],
[
"Montanino",
"D.",
""
],
[
"Palazzo",
"A.",
""
],
[
"Rotunno",
"A. M.",
""
]
] | We perform a global analysis of neutrino oscillation data, including high-precision measurements of the neutrino mixing angle theta_13 at reactor experiments, which have confirmed previous indications in favor of theta_13>0. Recent data presented at the Neutrino 2012 Conference are also included. We focus on the correlations between theta_13 and the mixing angle theta_23, as well as between theta_13 and the neutrino CP-violation phase delta. We find interesting indications for theta_23< pi/4 and possible hints for delta ~ pi, with no significant difference between normal and inverted mass hierarchy. |
hep-ph/9605457 | Thorsten Ohl | Harald Anlauf, Panagiotis Manakos, Thorsten Ohl (TH Darmstadt), Hans
Dieter Dahmen (Universitaet Siegen) | WOPPER, Version 1.5: A Monte Carlo Event Generator for e+e- to (W+W-) to
4f + n gamma at LEP2 and beyond | 36 pages, standard LaTeX (8 PostScript figures), corrected the sign
in the relation of z_Z and g_5^Z, corrected a few typos and included the
Feynman diagrams in PostScript | null | null | IKDA 96/15 | hep-ph hep-ex | null | We describe the new version of the Monte Carlo event generator WOPPER for
four fermion production through W-pairs including resummed leading logarithmic
QED radiative corrections. Among the new features included are singly resonant
background diagrams and anomalous triple gauge boson couplings.
| [
{
"created": "Fri, 31 May 1996 13:55:25 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 1996 17:18:47 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Anlauf",
"Harald",
"",
"TH Darmstadt"
],
[
"Manakos",
"Panagiotis",
"",
"TH Darmstadt"
],
[
"Ohl",
"Thorsten",
"",
"TH Darmstadt"
],
[
"Dahmen",
"Hans Dieter",
"",
"Universitaet Siegen"
]
] | We describe the new version of the Monte Carlo event generator WOPPER for four fermion production through W-pairs including resummed leading logarithmic QED radiative corrections. Among the new features included are singly resonant background diagrams and anomalous triple gauge boson couplings. |
hep-ph/9508403 | Brian Harris | B. W. Harris (Florida State U.), J. Smith (SUNY, Stony Brook) and R.
Vogt (LBL, Berkeley & UC Davis) | Reanalysis of the EMC charm production data with extrinsic and intrinsic
charm at NLO | Latex with 7 figures in seperate file. Revised version to appear in
Nuclear Physics B. Conclusions unchanged | Nucl.Phys.B461:181-196,1996 | 10.1016/0550-3213(95)00652-4 | FSU-HEP-951030,ITP-SB-95-15,LBL-37266 | hep-ph hep-ex | null | A calculation of the next-to-leading order exclusive extrinsic charm quark
differential distributions in deeply inelastic electroproduction has recently
been completed. Using these results we compare the NLO extrinsic contributions
to the charm structure function $F_2(x,Q^2,m_c^2)$ with the corresponding NLO
intrinsic contributions. The results of this analysis are compared with the EMC
DIS charm quark data and evidence for an intrinsic charm component in the
proton is found.
| [
{
"created": "Wed, 30 Aug 1995 17:35:43 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 1995 18:51:07 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Harris",
"B. W.",
"",
"Florida State U."
],
[
"Smith",
"J.",
"",
"SUNY, Stony Brook"
],
[
"Vogt",
"R.",
"",
"LBL, Berkeley & UC Davis"
]
] | A calculation of the next-to-leading order exclusive extrinsic charm quark differential distributions in deeply inelastic electroproduction has recently been completed. Using these results we compare the NLO extrinsic contributions to the charm structure function $F_2(x,Q^2,m_c^2)$ with the corresponding NLO intrinsic contributions. The results of this analysis are compared with the EMC DIS charm quark data and evidence for an intrinsic charm component in the proton is found. |
2104.09908 | Shuming Wu | Shu-Ming Wu, Jia-Jun Wu, Bing-Song Zou | The effective radius for production of baryon-antibaryon pairs from
$\psi$ decays | null | Phys. Rev. D 104, 054018 (2021) | 10.1103/PhysRevD.104.054018 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | By using the covariant L-S Scheme for the partial wave analysis, we deduce
the ratios between the S-wave and D-wave contributions from the recent data of
$\psi(1^-) \to B_8(1/2^+) \bar{B}_8(1/2^-)$ from the BESIII collaboration. For
the $J/\psi\to \Lambda\bar{\Lambda}$ and $J/\psi(\psi(2S))\to
\Sigma^{+}\bar{\Sigma}^{-}$, the ratios are fixed and the average angular
momenta are computed to estimate the effective radii of these processes. The
results show that the effective radii of these decays of $J/\psi(\psi(2S))$ are
very small, which are around 0.04 fm. Thus, it is a nice place to search
excited baryon resonances with lower spin in the decays of $J/\psi(\psi(2S))$.
Furthermore, for the other $\psi(1^-) \to B_8(1/2^+) \bar{B}_8(1/2^-)$
reactions, we propose some methods to get such effective radius.
| [
{
"created": "Tue, 20 Apr 2021 11:33:48 GMT",
"version": "v1"
}
] | 2021-09-22 | [
[
"Wu",
"Shu-Ming",
""
],
[
"Wu",
"Jia-Jun",
""
],
[
"Zou",
"Bing-Song",
""
]
] | By using the covariant L-S Scheme for the partial wave analysis, we deduce the ratios between the S-wave and D-wave contributions from the recent data of $\psi(1^-) \to B_8(1/2^+) \bar{B}_8(1/2^-)$ from the BESIII collaboration. For the $J/\psi\to \Lambda\bar{\Lambda}$ and $J/\psi(\psi(2S))\to \Sigma^{+}\bar{\Sigma}^{-}$, the ratios are fixed and the average angular momenta are computed to estimate the effective radii of these processes. The results show that the effective radii of these decays of $J/\psi(\psi(2S))$ are very small, which are around 0.04 fm. Thus, it is a nice place to search excited baryon resonances with lower spin in the decays of $J/\psi(\psi(2S))$. Furthermore, for the other $\psi(1^-) \to B_8(1/2^+) \bar{B}_8(1/2^-)$ reactions, we propose some methods to get such effective radius. |
1209.0204 | Mikhail Zubkov | G. E. Volovik, M. A. Zubkov | The Nambu sum rule and the relation between the masses of composite
Higgs bosons | Latex, 15 pages | Phys. Rev. D 87, 075016 (2013) | 10.1103/PhysRevD.87.075016 | ITEP-LAT/2012-11 | hep-ph cond-mat.supr-con hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the known results on the bosonic spectrum in various NJL models
both in the condensed matter physics and in relativistic quantum field theory
including $^3$He-B, $^3$He-A, the thin films of superfluid He-3, and QCD
(Hadronic phase and the Color Flavor Locking phase). Next, we calculate bosonic
spectrum in the relativistic model of top quark condensation suggested in
\cite{Miransky}. In all considered cases the sum rule appears that relates the
masses (energy gaps) $M_{boson}$ of the bosonic excitations in each channel
with the mass (energy gap) of the condensed fermion $M_f$ as $\sum M_{boson}^2
= 4 M_f^2$. Previously this relation was established by Nambu in \cite{Nambu}
for $^3$He-B and for the s - wave superconductor. We generalize this relation
to the wider class of models and call it the Nambu sum rule. We discuss the
possibility to apply this sum rule to various models of top quark condensation.
In some cases this rule allows to calculate the masses of extra Higgs bosons
that are the Nambu partners of the 125 GeV Higgs.
| [
{
"created": "Sun, 2 Sep 2012 19:30:31 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2012 14:08:24 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Sep 2012 18:48:08 GMT",
"version": "v3"
},
{
"created": "Thu, 4 Oct 2012 19:41:53 GMT",
"version": "v4"
},
{
"creat... | 2013-05-28 | [
[
"Volovik",
"G. E.",
""
],
[
"Zubkov",
"M. A.",
""
]
] | We review the known results on the bosonic spectrum in various NJL models both in the condensed matter physics and in relativistic quantum field theory including $^3$He-B, $^3$He-A, the thin films of superfluid He-3, and QCD (Hadronic phase and the Color Flavor Locking phase). Next, we calculate bosonic spectrum in the relativistic model of top quark condensation suggested in \cite{Miransky}. In all considered cases the sum rule appears that relates the masses (energy gaps) $M_{boson}$ of the bosonic excitations in each channel with the mass (energy gap) of the condensed fermion $M_f$ as $\sum M_{boson}^2 = 4 M_f^2$. Previously this relation was established by Nambu in \cite{Nambu} for $^3$He-B and for the s - wave superconductor. We generalize this relation to the wider class of models and call it the Nambu sum rule. We discuss the possibility to apply this sum rule to various models of top quark condensation. In some cases this rule allows to calculate the masses of extra Higgs bosons that are the Nambu partners of the 125 GeV Higgs. |
2012.14818 | Tania Robens | Jan Kalinowski, Tania Robens, Dorota Sokolowska and Aleksander Filip
Zarnecki | IDM benchmarks for the LHC and future colliders | 44 pages, 11 figures; v2: corresponds to published journal version
(slight style differences) | Symmetry 2021, 13(6) | 10.3390/sym13060991 | RBI-ThPhys-2020-55 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present cross-section expectations for various processes and collider
options, for benchmark scenarios of the Inert Doublet Model, a Two Higgs
Doublet Model with a dark matter candidate. The proposed scenarios are
consistent with current dark matter constraints, including the most recent
bounds from the XENON1T experiment and relic density, as well as with known
collider and low-energy limits. These benchmarks, chosen in earlier work for
studies at $e^+e^-$ colliders, exhibit a variety of kinematic features that
should be explored at current and future runs of the LHC. We provide cross
sections for all relevant production processes at 13 TeV, 27 TeV and 100 TeV
proton collider, as well as for a possible 10 TeV and 30 TeV muon collider.
| [
{
"created": "Tue, 29 Dec 2020 15:55:38 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jun 2021 19:16:38 GMT",
"version": "v2"
}
] | 2021-06-08 | [
[
"Kalinowski",
"Jan",
""
],
[
"Robens",
"Tania",
""
],
[
"Sokolowska",
"Dorota",
""
],
[
"Zarnecki",
"Aleksander Filip",
""
]
] | We present cross-section expectations for various processes and collider options, for benchmark scenarios of the Inert Doublet Model, a Two Higgs Doublet Model with a dark matter candidate. The proposed scenarios are consistent with current dark matter constraints, including the most recent bounds from the XENON1T experiment and relic density, as well as with known collider and low-energy limits. These benchmarks, chosen in earlier work for studies at $e^+e^-$ colliders, exhibit a variety of kinematic features that should be explored at current and future runs of the LHC. We provide cross sections for all relevant production processes at 13 TeV, 27 TeV and 100 TeV proton collider, as well as for a possible 10 TeV and 30 TeV muon collider. |
0907.1694 | Graciela B. Gelmini | Graciela B. Gelmini | Experimental signatures of non-standard pre-BBN cosmologies | Talk given at the "Dark Matter Conference", Galileo Galilei
Institute, Feb. 9-11, 2009, Florence, Italy. 6 pages, 4 figures | Nucl.Phys.Proc.Suppl.194:63-68,2009 | 10.1016/j.nuclphysbps.2009.07.084 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If detected, dark matter particles such as WIMPs and sterile neutrinos will
be the earliest relics we can study, the first coming from before Big Bang
Nucleosynthesis, an epoch from which we have no data so far. Here we discuss
how different pre-BBN cosmological models affect the properties of these
particles, and how these properties could thus allow to determine the evolution
of the Universe before BBN.
| [
{
"created": "Thu, 9 Jul 2009 23:57:02 GMT",
"version": "v1"
}
] | 2009-11-05 | [
[
"Gelmini",
"Graciela B.",
""
]
] | If detected, dark matter particles such as WIMPs and sterile neutrinos will be the earliest relics we can study, the first coming from before Big Bang Nucleosynthesis, an epoch from which we have no data so far. Here we discuss how different pre-BBN cosmological models affect the properties of these particles, and how these properties could thus allow to determine the evolution of the Universe before BBN. |
1809.02524 | Nikolaos Kidonakis | Nikolaos Kidonakis | Single-top and top-antitop cross sections | 7 pages, 6 figures; presented at QCD@Work 2018, Matera, Italy, June
25-28, 2018 | EPJ Web Conf. 192, 00004 (2018) | 10.1051/epjconf/201819200004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present high-order calculations, including soft-gluon corrections, for
single-top and top-antitop production cross sections and differential
distributions. For single-top production, results are presented for the three
different channels in the Standard Model, for associated production with a
charged Higgs, and for processes involving anomalous couplings. For top-antitop
pair production, total cross sections and top-quark transverse-momentum and
rapidity distributions are presented for various LHC energies.
| [
{
"created": "Fri, 7 Sep 2018 15:09:07 GMT",
"version": "v1"
}
] | 2023-02-21 | [
[
"Kidonakis",
"Nikolaos",
""
]
] | I present high-order calculations, including soft-gluon corrections, for single-top and top-antitop production cross sections and differential distributions. For single-top production, results are presented for the three different channels in the Standard Model, for associated production with a charged Higgs, and for processes involving anomalous couplings. For top-antitop pair production, total cross sections and top-quark transverse-momentum and rapidity distributions are presented for various LHC energies. |
0709.3062 | Michele Salvadore | J. Bartels, M. Salvadore, G. P. Vacca | Multiple interactions and AGK rules in pQCD | Talk given by MS at 12th International Conference on Elastic and
Diffractive Scattering: Forward Physics and QCD, Hamburg, DESY, Germany,
21-25 May 2007. 7pp. Minor changes | null | null | null | hep-ph | null | We review some aspects of multiple interactions in High Energy QCD; we
discuss in particular AGK rules and present some results concerning multiple
interactions in the context of jet production.
| [
{
"created": "Wed, 19 Sep 2007 16:19:57 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2007 08:34:40 GMT",
"version": "v2"
}
] | 2011-11-10 | [
[
"Bartels",
"J.",
""
],
[
"Salvadore",
"M.",
""
],
[
"Vacca",
"G. P.",
""
]
] | We review some aspects of multiple interactions in High Energy QCD; we discuss in particular AGK rules and present some results concerning multiple interactions in the context of jet production. |
1302.4553 | Nick Evans | Nick Evans and Kimmo Tuominen | Holographic Modelling of a Light Techni-Dilaton | 8 pages, 8 pdf figures, added discussion of Fig 3 and new references | null | 10.1103/PhysRevD.87.086003 | SHEP-13-04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simplified holographic model of chiral symmetry breaking in
gauge theory. The chiral condensate is represented by a single scalar field in
AdS, with the gauge dynamics input through radial dependence of its mass,
representing the running of the anomalous dimension of the qbar q operator. We
discuss simple examples of the chiral transition out of the conformal window
when the infrared value of the anomalous dimension, \gamma_m, is tuned to one
(equivalently the AdS-scalar mass squared is tuned to the
Breitenlohner-Freedman bound of -4). The output of the model are the masses of
the $\bar{q} q$ scalar meson bound states. We show in an explicit example that
if the gradient of the running of the anomalous dimension falls to zero at the
scale where the BF bound violation occurs, so that the theory becomes near
conformal, then the theory possesses a techni-dilaton state that is
parametrically lighter than the dynamically generated quark mass. Indeed the
full spectrum of excited meson states also become light (relative to the
techni-quark mass) as they approach a conformal spectrum.
| [
{
"created": "Tue, 19 Feb 2013 09:28:21 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2013 13:27:20 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Mar 2013 11:04:42 GMT",
"version": "v3"
}
] | 2013-04-17 | [
[
"Evans",
"Nick",
""
],
[
"Tuominen",
"Kimmo",
""
]
] | We present a simplified holographic model of chiral symmetry breaking in gauge theory. The chiral condensate is represented by a single scalar field in AdS, with the gauge dynamics input through radial dependence of its mass, representing the running of the anomalous dimension of the qbar q operator. We discuss simple examples of the chiral transition out of the conformal window when the infrared value of the anomalous dimension, \gamma_m, is tuned to one (equivalently the AdS-scalar mass squared is tuned to the Breitenlohner-Freedman bound of -4). The output of the model are the masses of the $\bar{q} q$ scalar meson bound states. We show in an explicit example that if the gradient of the running of the anomalous dimension falls to zero at the scale where the BF bound violation occurs, so that the theory becomes near conformal, then the theory possesses a techni-dilaton state that is parametrically lighter than the dynamically generated quark mass. Indeed the full spectrum of excited meson states also become light (relative to the techni-quark mass) as they approach a conformal spectrum. |
hep-ph/9806409 | Francesco Sannino | T. Appelquist and F. Sannino (Yale Univ.) | The Physical Spectrum of Conformal SU(N) Gauge Theories | 9 pages, LaTeX | Phys.Rev.D59:067702,1999 | 10.1103/PhysRevD.59.067702 | YCTP-P12-98 | hep-ph hep-th | null | We investigate the physical spectrum of vector-like SU(N) gauge theories with
infrared coupling close to but above the critical value for a conformal phase
transition. We use dispersion relations, the momentum dependence of the
dynamical fermion mass and resonance saturation. We show that the second
spectral function sum rule is substantially affected by the continuum
contribution, allowing for a reduction of the axial vector - vector mass
splitting with respect to QCD-like theories. In technicolor theories, this
feature can result in a small or even negative contribution to the electroweak
S parameter.
| [
{
"created": "Thu, 18 Jun 1998 18:18:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Appelquist",
"T.",
"",
"Yale Univ."
],
[
"Sannino",
"F.",
"",
"Yale Univ."
]
] | We investigate the physical spectrum of vector-like SU(N) gauge theories with infrared coupling close to but above the critical value for a conformal phase transition. We use dispersion relations, the momentum dependence of the dynamical fermion mass and resonance saturation. We show that the second spectral function sum rule is substantially affected by the continuum contribution, allowing for a reduction of the axial vector - vector mass splitting with respect to QCD-like theories. In technicolor theories, this feature can result in a small or even negative contribution to the electroweak S parameter. |
2405.17341 | Vishnudath K. N. | C. S. Kim, Dibyakrupa Sahoo, and K. N. Vishnudath | Searching for signatures of new physics in $B \to K \, \nu \,
\overline{\nu}$ to distinguish between Dirac and Majorana neutrinos | 14 pages, 5 captioned figures, more relevant references added | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We conduct a model-independent analysis of the distinct signatures of various
generic new physics possibilities in the decay $B \to K \, \nu \,
\overline{\nu}$ by analyzing the branching ratio as well as the missing
mass-square distribution. Considering the final neutrinos to be of the same
flavor with non-zero mass, we discuss the new physics contributions for both
Dirac and Majorana neutrino possibilities. In our study, we utilize the
analytical relations among form factors in semi-leptonic $B \to K$ transitions,
which are consistent with current lattice QCD predictions to a very high
numerical accuracy. We provide constraints on different new physics parameters,
taking into account the recent measurement of $B^+ \to K^+ \, \nu \,
\overline{\nu}$ branching ratio by the Belle-II collaboration. In future, if
the missing mass-square distribution for $B^+ \to K^+ \, \nu \, \overline{\nu}$
decay gets reported by Belle-II with analysis of more events than their present
data set, one can not only investigate possible new physics effects in these
decays, but also probe the Dirac/Majorana nature of the neutrinos using quantum
statistics, since a difference between the two cases is known to exist in the
presence of non-standard neutrino interactions.
| [
{
"created": "Mon, 27 May 2024 16:47:50 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2024 14:13:51 GMT",
"version": "v2"
}
] | 2024-06-05 | [
[
"Kim",
"C. S.",
""
],
[
"Sahoo",
"Dibyakrupa",
""
],
[
"Vishnudath",
"K. N.",
""
]
] | We conduct a model-independent analysis of the distinct signatures of various generic new physics possibilities in the decay $B \to K \, \nu \, \overline{\nu}$ by analyzing the branching ratio as well as the missing mass-square distribution. Considering the final neutrinos to be of the same flavor with non-zero mass, we discuss the new physics contributions for both Dirac and Majorana neutrino possibilities. In our study, we utilize the analytical relations among form factors in semi-leptonic $B \to K$ transitions, which are consistent with current lattice QCD predictions to a very high numerical accuracy. We provide constraints on different new physics parameters, taking into account the recent measurement of $B^+ \to K^+ \, \nu \, \overline{\nu}$ branching ratio by the Belle-II collaboration. In future, if the missing mass-square distribution for $B^+ \to K^+ \, \nu \, \overline{\nu}$ decay gets reported by Belle-II with analysis of more events than their present data set, one can not only investigate possible new physics effects in these decays, but also probe the Dirac/Majorana nature of the neutrinos using quantum statistics, since a difference between the two cases is known to exist in the presence of non-standard neutrino interactions. |
1306.3583 | M.I. Vyazovsky | M. A. Braun, S. S. Pozdnyakov, M. Yu. Salykin and M. I. Vyazovsky
(Saint-Petersburg State University, Russia) | Gluon production in the Lipatov effective action formalism | 27 pages, 14 figures; to be published in Eur.Phys.Jour. C | null | 10.1140/epjc/s10052-013-2572-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gluon production on two scattering centers is studied in the formalism of
reggeized gluons. Different contributions to the inclusive cross-section are
derived with the help of the Lipatov effective action. The AGK relations
between these contributions are established. The found inclusive cross-section
is compared to the one in the dipole picture and demonstrated to be the same.
| [
{
"created": "Sat, 15 Jun 2013 14:49:49 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Sep 2013 00:47:52 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Braun",
"M. A.",
"",
"Saint-Petersburg State University, Russia"
],
[
"Pozdnyakov",
"S. S.",
"",
"Saint-Petersburg State University, Russia"
],
[
"Salykin",
"M. Yu.",
"",
"Saint-Petersburg State University, Russia"
],
[
"Vyazovsky",
"M. I.",
... | Gluon production on two scattering centers is studied in the formalism of reggeized gluons. Different contributions to the inclusive cross-section are derived with the help of the Lipatov effective action. The AGK relations between these contributions are established. The found inclusive cross-section is compared to the one in the dipole picture and demonstrated to be the same. |
1811.00493 | Jan Sch\"utte-Engel | Jan Sch\"utte-Engel (on behalf of the MADMAX collaboration) | Simulation studies for the MADMAX axion direct detection experiment | 4 pages, 5 figures, Contributed to the 14th Patras Workshop on
Axions, WIMPs and WISPs, DESY in Hamburg, June 18 to 22, 2018 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general approach to solve the Maxwell-axion equations for
arbitrary geometries and materials. The approach is based on the finite element
method (FEM) and applied to experimental setups related to the new MADMAX
(MAgnetized Disc and Mirror Axion eXperiment) project. Analytical methods are
used to verify the FEM simulations. MADMAX is a dielectric haloscope which will
utilize axion-photon conversion at many dielectric interfaces and probe axions
in the mass range $m_a=40-400\,\mu\text{eV}$.
| [
{
"created": "Thu, 1 Nov 2018 16:52:44 GMT",
"version": "v1"
}
] | 2018-11-02 | [
[
"Schütte-Engel",
"Jan",
"",
"on behalf of the MADMAX collaboration"
]
] | We present a general approach to solve the Maxwell-axion equations for arbitrary geometries and materials. The approach is based on the finite element method (FEM) and applied to experimental setups related to the new MADMAX (MAgnetized Disc and Mirror Axion eXperiment) project. Analytical methods are used to verify the FEM simulations. MADMAX is a dielectric haloscope which will utilize axion-photon conversion at many dielectric interfaces and probe axions in the mass range $m_a=40-400\,\mu\text{eV}$. |
2407.13804 | Shaswat Tiwari | Swagato Mukherjee, Vladimir Skokov, Andrey Tarasov and Shaswat Tiwari | TMD factorization bridging large and small x | 6 pages, 1 figure, submitted to Proceedings, 31st workshop on Deep
inelastic scattering: Grenoble, April 8 to 12 2024. arXiv admin note: text
overlap with arXiv:2311.16402 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | QCD factorization takes different forms in the large-x and small-x regimes.
At large-x, collinear factorization leads to the DGLAP evolution equation,
while at small-x, rapidity factorization results in the BFKL equation. To unify
these different regimes, a new TMD factorization based on the background field
method is proposed. This factorization not only reduces to CSS and DGLAP in the
large-x limit and BFKL in the small-x limit, but also defines a general
evolution away from these regimes.
| [
{
"created": "Wed, 17 Jul 2024 22:58:01 GMT",
"version": "v1"
}
] | 2024-07-22 | [
[
"Mukherjee",
"Swagato",
""
],
[
"Skokov",
"Vladimir",
""
],
[
"Tarasov",
"Andrey",
""
],
[
"Tiwari",
"Shaswat",
""
]
] | QCD factorization takes different forms in the large-x and small-x regimes. At large-x, collinear factorization leads to the DGLAP evolution equation, while at small-x, rapidity factorization results in the BFKL equation. To unify these different regimes, a new TMD factorization based on the background field method is proposed. This factorization not only reduces to CSS and DGLAP in the large-x limit and BFKL in the small-x limit, but also defines a general evolution away from these regimes. |
hep-ph/9506309 | Ulf Meissner | V. Bernard, A.H. Blin, B. Hiller, Y.P. Ivanov, A.A. Osipov and Ulf-G.
Mei{\ss}ner | Pion Observables in the Extended NJL Model with Vector and Axial-Vector
Mesons | 39 pp, LaTeX file, uses epsf, 7 figures (appended as compressed tar
files in pion.uu) | Annals Phys. 249 (1996) 499-531 | 10.1006/aphy.1996.0081 | CRN 95-25 and TK 95 18 | hep-ph nucl-th | null | The momentum-space bosonization method of a Nambu and Jona-Lasinio type model
with vector and axial-vector mesons is applied to $\pi\pi$ scattering. Unlike
the case in earlier published papers, we obtain the $\pi\pi$ scattering
amplitude using the linear and nonlinear realizations of chiral symmetry and
fully taking into account the momentum dependence of meson vertices. We show
the full physical equivalence between these two approaches. The chiral
expansion procedure in this model is discussed in detail. Chiral expansions of
the quark mass, pion mass and constant $f_\pi$ are obtained. The low-energy
$\pi \pi $ phase shifts are compared to the available data. We also study the
scalar form factor of the pion.
| [
{
"created": "Tue, 13 Jun 1995 11:30:30 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bernard",
"V.",
""
],
[
"Blin",
"A. H.",
""
],
[
"Hiller",
"B.",
""
],
[
"Ivanov",
"Y. P.",
""
],
[
"Osipov",
"A. A.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | The momentum-space bosonization method of a Nambu and Jona-Lasinio type model with vector and axial-vector mesons is applied to $\pi\pi$ scattering. Unlike the case in earlier published papers, we obtain the $\pi\pi$ scattering amplitude using the linear and nonlinear realizations of chiral symmetry and fully taking into account the momentum dependence of meson vertices. We show the full physical equivalence between these two approaches. The chiral expansion procedure in this model is discussed in detail. Chiral expansions of the quark mass, pion mass and constant $f_\pi$ are obtained. The low-energy $\pi \pi $ phase shifts are compared to the available data. We also study the scalar form factor of the pion. |
1606.06148 | David R. Entem | P.G. Ortega and D. R. Entem and F. Fern\'andez | LHCb pentaquarks in constituent quark models | 5 pages, 2 tables | null | 10.1016/j.physletb.2016.11.008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently discovered $P_c(4380)^+$ and $P_c(4450)^+$ states at LHCb have
masses close to the $\bar D\Sigma_c^*$ and $\bar D^*\Sigma_c$ thresholds,
respectively, which suggest that they may have significant meson-baryon
molecular components. We analyze these states in the framework of a constituent
quark model which has been applied to a wide range of hadronic observables,
being the model parameters, therefore, completely constrained.
The $P_c(4380)^+$ and $P_c(4450)^+$ are studied as molecular states composed
by charmed baryons and open charm mesons. Several bound states with the proper
binding energy are found in the $\bar D\Sigma_c^*$ and $\bar D^*\Sigma_c$
channels. We discuss the possible assignments of these states from their decay
widths. Moreover, two more states are predicted, associated with the $\bar
D\Sigma_c$ and $\bar D^* \Sigma_c^*$ thresholds.
| [
{
"created": "Mon, 20 Jun 2016 14:45:03 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Ortega",
"P. G.",
""
],
[
"Entem",
"D. R.",
""
],
[
"Fernández",
"F.",
""
]
] | The recently discovered $P_c(4380)^+$ and $P_c(4450)^+$ states at LHCb have masses close to the $\bar D\Sigma_c^*$ and $\bar D^*\Sigma_c$ thresholds, respectively, which suggest that they may have significant meson-baryon molecular components. We analyze these states in the framework of a constituent quark model which has been applied to a wide range of hadronic observables, being the model parameters, therefore, completely constrained. The $P_c(4380)^+$ and $P_c(4450)^+$ are studied as molecular states composed by charmed baryons and open charm mesons. Several bound states with the proper binding energy are found in the $\bar D\Sigma_c^*$ and $\bar D^*\Sigma_c$ channels. We discuss the possible assignments of these states from their decay widths. Moreover, two more states are predicted, associated with the $\bar D\Sigma_c$ and $\bar D^* \Sigma_c^*$ thresholds. |
1101.1894 | Dario Zappala | Maurizio Consoli | On the low-energy spectrum of spontaneously broken \Phi^4 theories | 13 pages. Accepted for publication in Modern Physics Letters A | Mod.Phys.Lett.A26:531-542,2011 | 10.1142/S0217732311035067 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The low-energy spectrum of a one-component, spontaneously broken \Phi^4
theory is generally believed to have the same simple massive form \sqrt{{\bf
p}^2 + m^2_h} as in the symmetric phase where < \Phi >=0. However, in lattice
simulations of the 4D Ising limit of the theory, the two-point connected
correlator and the connected scalar propagator show deviations from a standard
massive behaviour that do not exist in the symmetric phase. As a support for
this observed discrepancy, I present a variational, analytic calculation of the
energy spectrum E_1({\bf p}) in the broken phase. This analytic result, while
providing the trend E_1({\bf p})\sim \sqrt{{\bf p}^2 + m^2_h} at large |{\bf
p}|, gives an energy gap E_1(0)< m_h, even when approaching the infinite-cutoff
limit \Lambda \to \infty with that infinitesimal coupling \lambda \sim 1/\ln
\Lambda suggested by the standard interpretation of "triviality" within
leading-order perturbation theory. I also compare with other approaches and
discuss the more general implications of the result.
| [
{
"created": "Mon, 10 Jan 2011 17:24:13 GMT",
"version": "v1"
}
] | 2011-04-04 | [
[
"Consoli",
"Maurizio",
""
]
] | The low-energy spectrum of a one-component, spontaneously broken \Phi^4 theory is generally believed to have the same simple massive form \sqrt{{\bf p}^2 + m^2_h} as in the symmetric phase where < \Phi >=0. However, in lattice simulations of the 4D Ising limit of the theory, the two-point connected correlator and the connected scalar propagator show deviations from a standard massive behaviour that do not exist in the symmetric phase. As a support for this observed discrepancy, I present a variational, analytic calculation of the energy spectrum E_1({\bf p}) in the broken phase. This analytic result, while providing the trend E_1({\bf p})\sim \sqrt{{\bf p}^2 + m^2_h} at large |{\bf p}|, gives an energy gap E_1(0)< m_h, even when approaching the infinite-cutoff limit \Lambda \to \infty with that infinitesimal coupling \lambda \sim 1/\ln \Lambda suggested by the standard interpretation of "triviality" within leading-order perturbation theory. I also compare with other approaches and discuss the more general implications of the result. |
1903.07069 | Chungku Kim | Chungku Kim | On Shell Renormalization Scheme From the Loopwise Expansion of the Pole
Mass | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce an on shell renormalization scheme in which the mass parameter
of minimal MS scheme is replaced with the pole mass obtained from the loop
order expansion of the pole mass in the MS scheme. As a consequence, the
quartic coupling constant remains same as that of the MS scheme and the vacuum
expectation value gets contributions from the one-particle-irreducible
diagrams. We also show the renormalization group invariance of the pole mass in
this scheme.
| [
{
"created": "Sun, 17 Mar 2019 12:27:36 GMT",
"version": "v1"
}
] | 2019-03-19 | [
[
"Kim",
"Chungku",
""
]
] | We introduce an on shell renormalization scheme in which the mass parameter of minimal MS scheme is replaced with the pole mass obtained from the loop order expansion of the pole mass in the MS scheme. As a consequence, the quartic coupling constant remains same as that of the MS scheme and the vacuum expectation value gets contributions from the one-particle-irreducible diagrams. We also show the renormalization group invariance of the pole mass in this scheme. |
2007.16098 | Sergei Gninenko | Sergei Gninenko, Dmitry Gorbunov | Refining constraints from Borexino measurements on a light $Z'$-boson
coupled to $L_\mu$-$L_\tau$ current | 6 pages, version accepted for publication in PLB | null | 10.1016/j.physletb.2021.136739 | INR-TH-2020-035 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent confirmation by FNAL of the $(g-2)_\mu$ muon anomaly gives strong
evidence for the possible existence of new physics beyond the Standard Model in
the muon sector. Thus it is worthy to revisit the existing experimental
constraints on models suggesting theoretically consistent explanations of the
anomaly. In this work, we point out that accounting for the loss of coherence
between the wave packets(mass states) of solar neutrinos is important for
setting limits on any model with new flavor-sensitive couplings in the neutrino
sector. By taking into account this effect and considering more accurately the
experimental constraints from the BOREXINO measurement of the $^7$Be solar
neutrino interaction rate we corrected the limits previously placed on the
coupling of the light $Z'$ to $L_\mu$-$L_\tau$ current in the parameter space
relevant to the muon $(g-2)_\mu$.
| [
{
"created": "Fri, 31 Jul 2020 14:21:16 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 2021 16:34:32 GMT",
"version": "v2"
}
] | 2021-10-27 | [
[
"Gninenko",
"Sergei",
""
],
[
"Gorbunov",
"Dmitry",
""
]
] | The recent confirmation by FNAL of the $(g-2)_\mu$ muon anomaly gives strong evidence for the possible existence of new physics beyond the Standard Model in the muon sector. Thus it is worthy to revisit the existing experimental constraints on models suggesting theoretically consistent explanations of the anomaly. In this work, we point out that accounting for the loss of coherence between the wave packets(mass states) of solar neutrinos is important for setting limits on any model with new flavor-sensitive couplings in the neutrino sector. By taking into account this effect and considering more accurately the experimental constraints from the BOREXINO measurement of the $^7$Be solar neutrino interaction rate we corrected the limits previously placed on the coupling of the light $Z'$ to $L_\mu$-$L_\tau$ current in the parameter space relevant to the muon $(g-2)_\mu$. |
1905.07690 | Jyoti Saini | Suman Kumbhakar and Jyoti Saini | Flavor signatures of complex anomalous $tcZ$ couplings | 11 pages, 1 figures, To be published in EPJ Plus | Eur. Phys. J. Plus 135, 330 (2020) | 10.1140/epjp/s13360-020-00341-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the effects of anomalous $tcZ$ couplings. Such
couplings would potentially affect several neutral current decays of $K$ and
$B$ mesons via $Z$-penguin diagrams. Using constraints from relevant
observables in $K$ and $B$ sectors, we find that the 2$\sigma$ upper bound on
the branching ratio of ${\cal B}(t \to c Z)$ is $1.47 \times 10^{-5}$ for real
coupling and $1.91 \times 10^{-4}$ for complex coupling. The current
experimental upper bound from ATLAS and CMS collaborations on the branching
ratio of $t \to c Z$ are $2.4 \times 10^{-4}$ and $4.9\times 10^{-4}$ at $95\%$
C.L., respectively. Hence the possibility of observation of $t \to c Z$ decay
at the level of $10^{-4}$ would imply the anomalous couplings to be complex.
Such complex couplings should also show up its presence in other related
decays. We find that an order of magnitude enhancement is possible in the
branching ratio of $K_L \to \pi^0 \nu \bar{\nu}$. Further, the complex $tcZ$
coupling can also provide large enhancements in many $CP$ violating angular
observables in $B \to K^* \mu^+ \mu^-$ decay.
| [
{
"created": "Sun, 19 May 2019 05:23:15 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Mar 2020 10:01:40 GMT",
"version": "v2"
}
] | 2020-03-31 | [
[
"Kumbhakar",
"Suman",
""
],
[
"Saini",
"Jyoti",
""
]
] | In this work we study the effects of anomalous $tcZ$ couplings. Such couplings would potentially affect several neutral current decays of $K$ and $B$ mesons via $Z$-penguin diagrams. Using constraints from relevant observables in $K$ and $B$ sectors, we find that the 2$\sigma$ upper bound on the branching ratio of ${\cal B}(t \to c Z)$ is $1.47 \times 10^{-5}$ for real coupling and $1.91 \times 10^{-4}$ for complex coupling. The current experimental upper bound from ATLAS and CMS collaborations on the branching ratio of $t \to c Z$ are $2.4 \times 10^{-4}$ and $4.9\times 10^{-4}$ at $95\%$ C.L., respectively. Hence the possibility of observation of $t \to c Z$ decay at the level of $10^{-4}$ would imply the anomalous couplings to be complex. Such complex couplings should also show up its presence in other related decays. We find that an order of magnitude enhancement is possible in the branching ratio of $K_L \to \pi^0 \nu \bar{\nu}$. Further, the complex $tcZ$ coupling can also provide large enhancements in many $CP$ violating angular observables in $B \to K^* \mu^+ \mu^-$ decay. |
1109.3759 | Roberto Ruiz De Austri | M.E. Cabrera (IFT-UAM/CSIC), J.A. Casas (IFT-UAM/CSIC), V.A. Mitsou
(IFIC-UV/CSIC), R. Ruiz de Austri (IFIC-UV/CSIC), J. Terron (UAM) | Histogram comparison as a powerful tool for the search of new physics at
LHC. Application to CMSSM | null | JHEP 1204 (2012) 133 | 10.1007/JHEP04(2012)133 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a rigorous and effective way to compare experimental and
theoretical histograms, incorporating the different sources of statistical and
systematic uncertainties. This is a useful tool to extract as much information
as possible from the comparison between experimental data with theoretical
simulations, optimizing the chances of identifying New Physics at the LHC. We
illustrate this by showing how a search in the CMSSM parameter space, using
Bayesian techniques, can effectively find the correct values of the CMSSM
parameters by comparing histograms of events with multijets + missing
transverse momentum displayed in the effective-mass variable. The procedure is
in fact very efficient to identify the true supersymmetric model, in the case
supersymmetry is really there and accessible to the LHC.
| [
{
"created": "Sat, 17 Sep 2011 09:12:42 GMT",
"version": "v1"
}
] | 2015-03-19 | [
[
"Cabrera",
"M. E.",
"",
"IFT-UAM/CSIC"
],
[
"Casas",
"J. A.",
"",
"IFT-UAM/CSIC"
],
[
"Mitsou",
"V. A.",
"",
"IFIC-UV/CSIC"
],
[
"de Austri",
"R. Ruiz",
"",
"IFIC-UV/CSIC"
],
[
"Terron",
"J.",
"",
"UAM"
]
] | We propose a rigorous and effective way to compare experimental and theoretical histograms, incorporating the different sources of statistical and systematic uncertainties. This is a useful tool to extract as much information as possible from the comparison between experimental data with theoretical simulations, optimizing the chances of identifying New Physics at the LHC. We illustrate this by showing how a search in the CMSSM parameter space, using Bayesian techniques, can effectively find the correct values of the CMSSM parameters by comparing histograms of events with multijets + missing transverse momentum displayed in the effective-mass variable. The procedure is in fact very efficient to identify the true supersymmetric model, in the case supersymmetry is really there and accessible to the LHC. |
2403.18889 | Martin Hoferichter | Martin Hoferichter | Prospects for PIONEER | 6+3 pages, 4 figures; presented at the 12th Workshop on the CKM
Unitarity Triangle, 18-22 September 2023, Santiago de Compostela | null | null | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pion $\beta$ decay, $\pi^+ \to\pi^0 e^+ \nu_e$, offers a pristine way to
measure the CKM matrix element $V_{ud}$ in a purely mesonic system, with
excellent control over the hadronic matrix elements. We review the physics
goals and current status of the PIONEER experiment, which aims at major
improvements in the branching fractions for the $\pi^+\to e^+ \nu_e$ decay in
Phase I and for pion $\beta$ decay in Phases II and III of its experimental
program, potentially leading to a measurement of $V_{ud}$ competitive with
determinations from $\beta$ decays involving nucleons.
| [
{
"created": "Wed, 27 Mar 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-03-29 | [
[
"Hoferichter",
"Martin",
""
]
] | Pion $\beta$ decay, $\pi^+ \to\pi^0 e^+ \nu_e$, offers a pristine way to measure the CKM matrix element $V_{ud}$ in a purely mesonic system, with excellent control over the hadronic matrix elements. We review the physics goals and current status of the PIONEER experiment, which aims at major improvements in the branching fractions for the $\pi^+\to e^+ \nu_e$ decay in Phase I and for pion $\beta$ decay in Phases II and III of its experimental program, potentially leading to a measurement of $V_{ud}$ competitive with determinations from $\beta$ decays involving nucleons. |
1205.3026 | Zhi-Wei Huang | Zhi-Wei Huang and Jueping Liu | Analytic calculation of doubly heavy hadron spectral density in
coordinate space | An instructive numerical method is added for fast evaluation of the
spectral density | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A systematic and easy-to-use method is developed to calculate directly the
doubly heavy hadron spectral density in the coordinate space. The correlation
function is expressed in terms of hypergeometric functions, and the spectral
density is obtained through two independent approaches: the simple integral
representation method and the epsilon-expansion method, respectively. It is
found that the spectral density of doubly heavy hadrons can be analytically
expressed through commonly known simple functions. This method can drastically
simplify and improve the QCD spectral sum rule calculation of the doubly heavy
hadrons. An instructive numerical method is also presented for fast evaluation
of the spectral density.
| [
{
"created": "Mon, 14 May 2012 13:54:16 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2012 12:53:59 GMT",
"version": "v2"
}
] | 2012-08-31 | [
[
"Huang",
"Zhi-Wei",
""
],
[
"Liu",
"Jueping",
""
]
] | A systematic and easy-to-use method is developed to calculate directly the doubly heavy hadron spectral density in the coordinate space. The correlation function is expressed in terms of hypergeometric functions, and the spectral density is obtained through two independent approaches: the simple integral representation method and the epsilon-expansion method, respectively. It is found that the spectral density of doubly heavy hadrons can be analytically expressed through commonly known simple functions. This method can drastically simplify and improve the QCD spectral sum rule calculation of the doubly heavy hadrons. An instructive numerical method is also presented for fast evaluation of the spectral density. |
hep-ph/9910455 | Randy Lewis | Randy Lewis and Nader Mobed | Isospin Violation and the Proton's Strange Form Factors | 4 pages, 2 figures, Talk given at 8th International Symposium on
Meson-Nucleon Physics and the Structure of the Nucleon (MENU 99), Zuoz,
Switzerland, 16-20 Aug 1999 | PiN Newslett.15:144-147,1999 | null | null | hep-ph nucl-th | null | The strange form factors of the proton are basic to an understanding of
proton structure, and are presently the focus of many experiments. Before the
strangeness effects can be extracted from data, it is necessary to calculate
and remove effects due to isospin violation, which exist independently of the
strange quark but which contribute nevertheless to the experimentally measured
``strange'' form factors. A discussion of the isospin violating contributions
to vector form factors is given here in the context of heavy baryon chiral
perturbation theory.
| [
{
"created": "Fri, 22 Oct 1999 21:54:44 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Lewis",
"Randy",
""
],
[
"Mobed",
"Nader",
""
]
] | The strange form factors of the proton are basic to an understanding of proton structure, and are presently the focus of many experiments. Before the strangeness effects can be extracted from data, it is necessary to calculate and remove effects due to isospin violation, which exist independently of the strange quark but which contribute nevertheless to the experimentally measured ``strange'' form factors. A discussion of the isospin violating contributions to vector form factors is given here in the context of heavy baryon chiral perturbation theory. |
1906.04047 | Raghunath Sahoo | Rutuparna Rath, Arvind Khuntia, Sushanta Tripathy, and Raghunath Sahoo | A Baseline Study of the Event-shape and Multiplicity Dependence of
Chemical Freeze-out Parameters in Proton-Proton Collisions at $\sqrt{s}$ = 13
TeV Using PYTHIA8 | Same as the published version | Physics 2, 679 (2020) | 10.3390/physics2040040 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The event-shape and multiplicity dependence of the chemical freeze-out
temperature ($T_{\text{ch}}$), freeze-out radius ($R$), and strangeness
saturation factor ($\gamma_{s}$) are obtained by studying the particle yields
from the PYTHIA8 Monte Carlo event generator in proton-proton (pp) collisions
at the centre-of-mass $\sqrt{s}$ = 13 TeV. Spherocity is one of the transverse
event-shape techniques to distinguish jetty and isotropic events in high-energy
collisions and helps in looking into various observables in a more differential
manner. In this study, spherocity~classes are divided into three categories,
namely (i) spherocity integrated, (ii) isotropic, and~(iii) jetty. The~chemical
freeze-out parameters are extracted using a statistical thermal model as a
function of the spherocity class and charged particle multiplicity in the
canonical, strangeness canonical, and grand canonical ensembles. A clear
observation of the multiplicity and spherocity class dependence of
$T_{\text{ch}}$, $R$, and $\gamma_{s}$ is observed. A final state multiplicity,
$N_{\rm ch}\geq$ 30 in the forward multiplicity acceptance of the ALICE
detector appears to be a thermodynamic limit, where the freeze-out parameters
become almost independent of the ensembles. This~study plays an important role
in understanding the particle production mechanism in high-multiplicity pp
collisions at the Large Hadron Collider (LHC) energies in view of a finite
hadronic phase lifetime in small systems.
| [
{
"created": "Fri, 7 Jun 2019 15:57:18 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 2020 18:07:43 GMT",
"version": "v2"
}
] | 2020-12-11 | [
[
"Rath",
"Rutuparna",
""
],
[
"Khuntia",
"Arvind",
""
],
[
"Tripathy",
"Sushanta",
""
],
[
"Sahoo",
"Raghunath",
""
]
] | The event-shape and multiplicity dependence of the chemical freeze-out temperature ($T_{\text{ch}}$), freeze-out radius ($R$), and strangeness saturation factor ($\gamma_{s}$) are obtained by studying the particle yields from the PYTHIA8 Monte Carlo event generator in proton-proton (pp) collisions at the centre-of-mass $\sqrt{s}$ = 13 TeV. Spherocity is one of the transverse event-shape techniques to distinguish jetty and isotropic events in high-energy collisions and helps in looking into various observables in a more differential manner. In this study, spherocity~classes are divided into three categories, namely (i) spherocity integrated, (ii) isotropic, and~(iii) jetty. The~chemical freeze-out parameters are extracted using a statistical thermal model as a function of the spherocity class and charged particle multiplicity in the canonical, strangeness canonical, and grand canonical ensembles. A clear observation of the multiplicity and spherocity class dependence of $T_{\text{ch}}$, $R$, and $\gamma_{s}$ is observed. A final state multiplicity, $N_{\rm ch}\geq$ 30 in the forward multiplicity acceptance of the ALICE detector appears to be a thermodynamic limit, where the freeze-out parameters become almost independent of the ensembles. This~study plays an important role in understanding the particle production mechanism in high-multiplicity pp collisions at the Large Hadron Collider (LHC) energies in view of a finite hadronic phase lifetime in small systems. |
1208.0934 | Diego Guadagnoli | Andrzej J. Buras, Jennifer Girrbach, Diego Guadagnoli, Gino Isidori | On the Standard Model prediction for BR(B{s,d} to mu+ mu-) | 15 pages. v3: very minor changes to match the journal version (EPJC) | null | 10.1140/epjc/s10052-012-2172-1 | FLAVOUR(267104)-ERC-20; LAPTH-032/12; CERN-PH-TH/2012-210 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay Bs to mu+ mu- is one of the milestones of the flavor program at the
LHC. We reappraise its Standard Model prediction. First, by analyzing the
theoretical rate in the light of its main parametric dependence, we highlight
the importance of a complete evaluation of higher-order electroweak
corrections, at present known only in the large-mt limit, and leaving sizable
dependence on the definition of electroweak parameters. Using insights from a
complete calculation of such corrections for K to pi bar{nu} nu decays, we find
a scheme in which NLO electroweak corrections are likely to be negligible.
Second, we address the issue of the correspondence between the initial and the
final state detected by the experiments, and those used in the theoretical
prediction. Particular attention is devoted to the effect of the soft
radiation, that has not been discussed for this mode in the previous
literature, and that can lead to O(10%) corrections to the decay rate. The
"non-radiative" branching ratio (that is equivalent to the branching ratio
fully inclusive of bremsstrahlung radiation) is estimated to be (3.23 +/- 0.27)
x 10^{-9} for the flavor eigenstate, with the main uncertainty resulting from
the value of f_{Bs}, followed by the uncertainty due to higher order
electroweak corrections. Applying the same strategy to Bd to mu+ mu-, we find
for its non-radiative branching ratio (1.07 +/- 0.10) x 10^{-10}.
| [
{
"created": "Sat, 4 Aug 2012 14:20:25 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Sep 2012 13:26:43 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Oct 2012 16:00:35 GMT",
"version": "v3"
}
] | 2015-06-11 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Girrbach",
"Jennifer",
""
],
[
"Guadagnoli",
"Diego",
""
],
[
"Isidori",
"Gino",
""
]
] | The decay Bs to mu+ mu- is one of the milestones of the flavor program at the LHC. We reappraise its Standard Model prediction. First, by analyzing the theoretical rate in the light of its main parametric dependence, we highlight the importance of a complete evaluation of higher-order electroweak corrections, at present known only in the large-mt limit, and leaving sizable dependence on the definition of electroweak parameters. Using insights from a complete calculation of such corrections for K to pi bar{nu} nu decays, we find a scheme in which NLO electroweak corrections are likely to be negligible. Second, we address the issue of the correspondence between the initial and the final state detected by the experiments, and those used in the theoretical prediction. Particular attention is devoted to the effect of the soft radiation, that has not been discussed for this mode in the previous literature, and that can lead to O(10%) corrections to the decay rate. The "non-radiative" branching ratio (that is equivalent to the branching ratio fully inclusive of bremsstrahlung radiation) is estimated to be (3.23 +/- 0.27) x 10^{-9} for the flavor eigenstate, with the main uncertainty resulting from the value of f_{Bs}, followed by the uncertainty due to higher order electroweak corrections. Applying the same strategy to Bd to mu+ mu-, we find for its non-radiative branching ratio (1.07 +/- 0.10) x 10^{-10}. |
2404.08971 | Ailin Zhang | You-You Lin, Ji-Ying Wang and Ailin Zhang | Mass spectrum of fully charmed $[cc][\bar c\bar c]$ tetraquarks | 9 pages, 5 tables, PDFLatex | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are three $S$ and seven $P$ fully charmed $[cc][\bar c\bar c]$
tetraquarks, the mass spectrum from $1S$ to $2P$ excitations is calculated in a
non-relativistic quark potential model. In the calculation, the interactions
among four internal quarks/antiquark are approximated as a dominant color
interaction between a diquark and an antidiquark, and a residual interaction
responsible for the diquark/antidiquark cluster effect. The color interaction
between the diquark and the antidiquark is characterized by the conventional
Cornell potential, while the residual interaction is modeled as the Yukawa-type
scalar $\sigma$ and vector $\omega$ boson exchange potentials. In the numerical
results, though the scalar $\sigma$ and vector $\omega$ boson exchange
interactions reduce the masses of $S-$wave $[cc][\bar c\bar c]$ tetraquarks
$40-50$ MeV, they contribute to the masses of other $[cc][\bar c\bar c]$
tetraquarks small. The mass splittings of $[cc][\bar c\bar c]$ tetraquarks
between different multiplets and within the same multiplet are smaller than
those in charmonium, and the splittings are affected by the scalar $\sigma$ or
vector $\omega$ boson exchange interactions small. Our calculations suggest
that the observed $X(6600)$, $X(6900)$ and $X(7300)$ should be different radial
excitations of $[cc][\bar c\bar c]$. The measurements of the $J^{PC}$ quantum
numbers and the mass splittings will be helpful to identify and understand of
the $[cc][\bar c\bar c]$ candidates.
| [
{
"created": "Sat, 13 Apr 2024 11:25:12 GMT",
"version": "v1"
}
] | 2024-04-16 | [
[
"Lin",
"You-You",
""
],
[
"Wang",
"Ji-Ying",
""
],
[
"Zhang",
"Ailin",
""
]
] | There are three $S$ and seven $P$ fully charmed $[cc][\bar c\bar c]$ tetraquarks, the mass spectrum from $1S$ to $2P$ excitations is calculated in a non-relativistic quark potential model. In the calculation, the interactions among four internal quarks/antiquark are approximated as a dominant color interaction between a diquark and an antidiquark, and a residual interaction responsible for the diquark/antidiquark cluster effect. The color interaction between the diquark and the antidiquark is characterized by the conventional Cornell potential, while the residual interaction is modeled as the Yukawa-type scalar $\sigma$ and vector $\omega$ boson exchange potentials. In the numerical results, though the scalar $\sigma$ and vector $\omega$ boson exchange interactions reduce the masses of $S-$wave $[cc][\bar c\bar c]$ tetraquarks $40-50$ MeV, they contribute to the masses of other $[cc][\bar c\bar c]$ tetraquarks small. The mass splittings of $[cc][\bar c\bar c]$ tetraquarks between different multiplets and within the same multiplet are smaller than those in charmonium, and the splittings are affected by the scalar $\sigma$ or vector $\omega$ boson exchange interactions small. Our calculations suggest that the observed $X(6600)$, $X(6900)$ and $X(7300)$ should be different radial excitations of $[cc][\bar c\bar c]$. The measurements of the $J^{PC}$ quantum numbers and the mass splittings will be helpful to identify and understand of the $[cc][\bar c\bar c]$ candidates. |
0705.0673 | Rudnei O. Ramos | Jean-Loic Kneur, Marcus Benghi Pinto, Rudnei O. Ramos and Ederson
Staudt | Updating the Phase Diagram of the Gross-Neveu Model in 2+1 Dimensions | 7 pages, 2 eps figures. Replaced with the version that matches the
published one (PLB) | Phys.Lett.B657:136-142,2007 | 10.1016/j.physletb.2007.10.013 | null | hep-ph cond-mat.soft hep-th | null | The method of optimized perturbation theory (OPT) is used to study the phase
diagram of the massless Gross-Neveu model in 2+1 dimensions. In the temperature
and chemical potential plane, our results give strong support to the existence
of a tricritical point and line of first order phase transition, previously
only suspected to exist from extensive lattice Monte Carlo simulations. In
addition of presenting these results we discuss how the OPT can be implemented
in conjunction with the Landau expansion in order to determine all the relevant
critical quantities.
| [
{
"created": "Fri, 4 May 2007 17:01:36 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2007 15:55:15 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Nov 2007 18:19:37 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Kneur",
"Jean-Loic",
""
],
[
"Pinto",
"Marcus Benghi",
""
],
[
"Ramos",
"Rudnei O.",
""
],
[
"Staudt",
"Ederson",
""
]
] | The method of optimized perturbation theory (OPT) is used to study the phase diagram of the massless Gross-Neveu model in 2+1 dimensions. In the temperature and chemical potential plane, our results give strong support to the existence of a tricritical point and line of first order phase transition, previously only suspected to exist from extensive lattice Monte Carlo simulations. In addition of presenting these results we discuss how the OPT can be implemented in conjunction with the Landau expansion in order to determine all the relevant critical quantities. |
0909.0419 | Hubert Spiesberger | H. Spiesberger | Photon 2009: Summary of Theory Talks | Summary Talk: Int. Conf. on the Structure and the Interactions of the
Photon incl. 18th Int. Workshop on Photon-Photon Collisions and Int. Workshop
on High Energy Photon Linear Colliders, 11-15 May 2009, DESY, Hamburg | null | null | MZ-TH/09-31 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conference 'Photon 2009' on the structure and the interactions of the
photon included sessions on photon-photon collisions and a future high-energy
photon linear collider. This summary of theoretical contributions to the
conference therefore has two parts. I will discuss the physics potential of
photon colliders with an emphasis on the study of electroweak physics and the
search for physics beyond the standard model. Secondly, I will describe a few
highlights in recent progress in the understanding of the properties and the
interaction of the photon, comprising the production of prompt photons, the
photon structure and exclusive hadron production, small-x and total cross
sections of deep inelastic scattering. Finally, I will review the status of the
comparison of measurement and theory for the muon anomalous magnetic moment
g-2.
| [
{
"created": "Wed, 2 Sep 2009 13:27:09 GMT",
"version": "v1"
}
] | 2009-09-03 | [
[
"Spiesberger",
"H.",
""
]
] | The conference 'Photon 2009' on the structure and the interactions of the photon included sessions on photon-photon collisions and a future high-energy photon linear collider. This summary of theoretical contributions to the conference therefore has two parts. I will discuss the physics potential of photon colliders with an emphasis on the study of electroweak physics and the search for physics beyond the standard model. Secondly, I will describe a few highlights in recent progress in the understanding of the properties and the interaction of the photon, comprising the production of prompt photons, the photon structure and exclusive hadron production, small-x and total cross sections of deep inelastic scattering. Finally, I will review the status of the comparison of measurement and theory for the muon anomalous magnetic moment g-2. |
1301.0376 | Li Xihuai | Xi-Huai Li and Jian-Xiong Wang | ${\mathcal O}(\alpha_s v^2)$ correction to $J/\psi$ plus $\eta_c$
production in $e^+e^-$ annihilation at $\sqrt{s}=10.6GeV | null | null | 10.1088/1674-1137/38/4/043101 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the nonrelativistic QCD factorization approach, ${\mathcal
O}(\alpha_s v^2)$ corrections to $\jpsi$ plus $\eta_c$ production in $e^+e^-$
annihilation at $\sqrt{s}=10.6 \gev$ is calculated in this work. The numerical
results show that the correction at $\alpha_s v^2$ order is only about a few
percent for the total theoretical result. It indicates that the perturbative
expansions for the theoretical prediction become convergence and higher order
correction will be smaller. The uncertainties from the long-distance matrix
elements, renormalization scale and the measurement in experiment are also
discussed. Our result is in agreement with previous result in ref [1].
| [
{
"created": "Thu, 3 Jan 2013 04:36:14 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Li",
"Xi-Huai",
""
],
[
"Wang",
"Jian-Xiong",
""
]
] | Based on the nonrelativistic QCD factorization approach, ${\mathcal O}(\alpha_s v^2)$ corrections to $\jpsi$ plus $\eta_c$ production in $e^+e^-$ annihilation at $\sqrt{s}=10.6 \gev$ is calculated in this work. The numerical results show that the correction at $\alpha_s v^2$ order is only about a few percent for the total theoretical result. It indicates that the perturbative expansions for the theoretical prediction become convergence and higher order correction will be smaller. The uncertainties from the long-distance matrix elements, renormalization scale and the measurement in experiment are also discussed. Our result is in agreement with previous result in ref [1]. |
2307.09641 | Gojko Vujanovic | W. Fan, G. Vujanovic, S. A. Bass, A. Angerami, R. Arora, S. Cao, Y.
Chen, T. Dai, L. Du, R. Ehlers, H. Elfner, R. J. Fries, C. Gale, Y. He, M.
Heffernan, U. Heinz, B. V. Jacak, P. M. Jacobs, S. Jeon, Y. Ji, L. Kasper, M.
Kordell II, A. Kumar, J. Latessa, Y.-J. Lee, R. Lemmon, D. Liyanage, A.
Lopez, M. Luzum, A. Majumder, S. Mak, A. Mankolli, C. Martin, H. Mehryar, T.
Mengel, J. Mulligan, C. Nattrass, J. Norman, J.-F. Paquet, C. Parker, J. H.
Putschke, G. Roland, B. Schenke, L. Schwiebert, A. Sengupta, C. Shen, C.
Sirimanna, D. Soeder, R. A. Soltz, I. Soudi, M. Strickland, Y. Tachibana, J.
Velkovska, X.-N. Wang, and W. Zhao (the JETSCAPE Collaboration) | A new metric improving Bayesian calibration of a multistage approach
studying hadron and inclusive jet suppression | 24 pages, 16 figures | null | null | null | hep-ph nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study parton energy-momentum exchange with the quark gluon plasma (QGP)
within a multistage approach composed of in-medium DGLAP evolution at high
virtuality, and (linearized) Boltzmann Transport formalism at lower virtuality.
This multistage simulation is then calibrated in comparison with high $p_T$
charged hadrons, D-mesons, and the inclusive jet nuclear modification factors,
using Bayesian model-to-data comparison, to extract the virtuality-dependent
transverse momentum broadening transport coefficient $\hat{q}$. To facilitate
this undertaking, we develop a quantitative metric for validating the Bayesian
workflow, which is used to analyze the sensitivity of various model parameters
to individual observables. The usefulness of this new metric in improving
Bayesian model emulation is shown to be highly beneficial for future such
analyses.
| [
{
"created": "Tue, 18 Jul 2023 21:10:15 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Oct 2023 22:30:00 GMT",
"version": "v2"
}
] | 2023-10-31 | [
[
"Fan",
"W.",
"",
"the JETSCAPE Collaboration"
],
[
"Vujanovic",
"G.",
"",
"the JETSCAPE Collaboration"
],
[
"Bass",
"S. A.",
"",
"the JETSCAPE Collaboration"
],
[
"Angerami",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Arora",
... | We study parton energy-momentum exchange with the quark gluon plasma (QGP) within a multistage approach composed of in-medium DGLAP evolution at high virtuality, and (linearized) Boltzmann Transport formalism at lower virtuality. This multistage simulation is then calibrated in comparison with high $p_T$ charged hadrons, D-mesons, and the inclusive jet nuclear modification factors, using Bayesian model-to-data comparison, to extract the virtuality-dependent transverse momentum broadening transport coefficient $\hat{q}$. To facilitate this undertaking, we develop a quantitative metric for validating the Bayesian workflow, which is used to analyze the sensitivity of various model parameters to individual observables. The usefulness of this new metric in improving Bayesian model emulation is shown to be highly beneficial for future such analyses. |
1011.2214 | Yue Zhang | Shao-Long Chen, Dilip Kumar Ghosh, Rabindra N. Mohapatra, Yue Zhang | Dynamical R-parity Breaking at the LHC | 30 pages, 13 figures, 6 tables, reference added | JHEP 1102:036,2011 | 10.1007/JHEP02(2011)036 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a class of extensions of the minimal supersymmetric standard model with
(B-L)/left-right symmetry that explains the neutrino masses, breaking R-parity
symmetry is an essential and dynamical requirement for successful gauge
symmetry breaking. Two consequences of these models are: (i) a new kind of
R-parity breaking interaction that protects proton stability but adds new
contributions to neutrinoless double beta decay and (ii) an upper bound on the
extra gauge and parity symmetry breaking scale which is within the large hadron
collider (LHC) energy range. We point out that an important prediction of such
theories is a potentially large mixing between the right-handed charged lepton
($e^c$) and the superpartner of the right-handed gauge boson ($\widetilde
W_R^+$), which leads to a brand new class of R-parity violating interactions of
type $\widetilde{\mu^c}^\dagger\nu_\mu^c e^c$ and $\widetilde{d^c}^\dagger\u^c
e^c$. We analyze the relevant constraints on the sparticle mass spectrum and
the LHC signatures for the case with smuon/stau NLSP and gravitino LSP. We note
the "smoking gun" signals for such models to be lepton flavor/number violating
processes: $pp\to \mu^\pm\mu^\pm e^+e^-jj$ (or $\tau^\pm\tau^\pm e^+e^-jj$) and
$pp\to\mu^\pm e^\pm b \bar{b} jj$ (or $\tau^\pm e^\pm b \bar{b} jj$) without
significant missing energy. The predicted multi-lepton final states and the
flavor structure make the model be distinguishable even in the early running of
the LHC.
| [
{
"created": "Tue, 9 Nov 2010 21:05:24 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Nov 2010 15:49:19 GMT",
"version": "v2"
}
] | 2011-02-16 | [
[
"Chen",
"Shao-Long",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Mohapatra",
"Rabindra N.",
""
],
[
"Zhang",
"Yue",
""
]
] | In a class of extensions of the minimal supersymmetric standard model with (B-L)/left-right symmetry that explains the neutrino masses, breaking R-parity symmetry is an essential and dynamical requirement for successful gauge symmetry breaking. Two consequences of these models are: (i) a new kind of R-parity breaking interaction that protects proton stability but adds new contributions to neutrinoless double beta decay and (ii) an upper bound on the extra gauge and parity symmetry breaking scale which is within the large hadron collider (LHC) energy range. We point out that an important prediction of such theories is a potentially large mixing between the right-handed charged lepton ($e^c$) and the superpartner of the right-handed gauge boson ($\widetilde W_R^+$), which leads to a brand new class of R-parity violating interactions of type $\widetilde{\mu^c}^\dagger\nu_\mu^c e^c$ and $\widetilde{d^c}^\dagger\u^c e^c$. We analyze the relevant constraints on the sparticle mass spectrum and the LHC signatures for the case with smuon/stau NLSP and gravitino LSP. We note the "smoking gun" signals for such models to be lepton flavor/number violating processes: $pp\to \mu^\pm\mu^\pm e^+e^-jj$ (or $\tau^\pm\tau^\pm e^+e^-jj$) and $pp\to\mu^\pm e^\pm b \bar{b} jj$ (or $\tau^\pm e^\pm b \bar{b} jj$) without significant missing energy. The predicted multi-lepton final states and the flavor structure make the model be distinguishable even in the early running of the LHC. |
1308.2239 | Shmuel Nussinov | Shmuel Nussinov | From Higgs to pions and Back -- the Unbearable Lightness of a Composite
Scalar Boson at 125 GeV in Purely Vectorial Theories | null | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the $125 GeV$ "Higgs" particle is unlikely to arise as a
fermion- antifermion composite if the underlying dynamics is a vectorial gauge
theory. The reason is that the lightest scalar in such theories is heavier than
the lightest pseudo-scalar with the mass difference being fixed by the scale of
the theory. LHC searches suggest that the scale of any new physics, including
that of a putative new theory dynamically generating the 125 GeV "Higgs"
particle, is relatively high $\sim{(1/2TeV-1TeV)}$. Also the LHC analysis
suggests that it is {\it scalar} namely $J^P = 0^+$ rather than pseudo-scalar.
Thus it is unlikely that the "Higgs" could arise as a composite in such
theories- though it will arise in special cases when the underlying binding
gauge group is real as a fermion-fermion bound state.
The direct considerations of the various two point functions in the large
$N_c$ limit presented below- suggest that massless pseudo-scalars, but not any
other anomalously light meson, arise as composites of massless fermions say the
massless u and $\bar{d}$ quarks in QCD. These massless pions manifest the
spontaneous breaking of the global axial symmetry in QCD with the pions being
(pseudo) Nambu Goldstone Bosons. This offers a different insight into SXSB in
QCD and most other confining non-abelian gauge vectorial gauge theory.
Specifically we consider the euclidean two point functions $F_I|x-y|$ for
asymptotic $|x-y|$ expressed as a sum over fermionic paths. We conjecture that
for the pseudo-scalar two point function - and for that case only- self
retracing paths and closely related paths make in this limit a positive,
coherent and dominant contribution, a contribution which evades the generic
asymptotic exponential fall-off and allows the lightest pseudoscalars to be
massless. The same arguments imply that the scalars are very massive.
| [
{
"created": "Fri, 9 Aug 2013 20:25:10 GMT",
"version": "v1"
}
] | 2013-08-13 | [
[
"Nussinov",
"Shmuel",
""
]
] | We argue that the $125 GeV$ "Higgs" particle is unlikely to arise as a fermion- antifermion composite if the underlying dynamics is a vectorial gauge theory. The reason is that the lightest scalar in such theories is heavier than the lightest pseudo-scalar with the mass difference being fixed by the scale of the theory. LHC searches suggest that the scale of any new physics, including that of a putative new theory dynamically generating the 125 GeV "Higgs" particle, is relatively high $\sim{(1/2TeV-1TeV)}$. Also the LHC analysis suggests that it is {\it scalar} namely $J^P = 0^+$ rather than pseudo-scalar. Thus it is unlikely that the "Higgs" could arise as a composite in such theories- though it will arise in special cases when the underlying binding gauge group is real as a fermion-fermion bound state. The direct considerations of the various two point functions in the large $N_c$ limit presented below- suggest that massless pseudo-scalars, but not any other anomalously light meson, arise as composites of massless fermions say the massless u and $\bar{d}$ quarks in QCD. These massless pions manifest the spontaneous breaking of the global axial symmetry in QCD with the pions being (pseudo) Nambu Goldstone Bosons. This offers a different insight into SXSB in QCD and most other confining non-abelian gauge vectorial gauge theory. Specifically we consider the euclidean two point functions $F_I|x-y|$ for asymptotic $|x-y|$ expressed as a sum over fermionic paths. We conjecture that for the pseudo-scalar two point function - and for that case only- self retracing paths and closely related paths make in this limit a positive, coherent and dominant contribution, a contribution which evades the generic asymptotic exponential fall-off and allows the lightest pseudoscalars to be massless. The same arguments imply that the scalars are very massive. |
1602.04654 | Marco Frasca | Marco Frasca | Nonlocal Nambu-Jona-Lasinio model and chiral chemical potential | 19 pages, 3 figures. Version accepted for publication in the European
Physical Journal C | Eur. Phys. J. C (2018) 78: 790 | 10.1140/epjc/s10052-018-6200-7 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the critical temperature in a nonlocal Nambu-Jona-Lasinio model
with the presence of a chiral chemical potential. The model we consider uses a
form factor derived from recent studies of the gluon propagator in Yang-Mills
theory and has the property to fit in excellent way the form factor arising
from the instanton liquid picture for the vacuum of the theory.
Nambu-Jona-Lasinio model is derived form quantum chromodynamics providing all
the constants of the theory without any need for fits. We show that the
critical temperature in this case always exists and increases as the square of
the chiral chemical potential. The expression we obtain for the critical
temperature depends on the mass gap that naturally arises from Yang-Mills
theory at low-energy as also confirmed by lattice computations.
| [
{
"created": "Mon, 15 Feb 2016 12:38:37 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Apr 2018 12:52:12 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Aug 2018 17:54:33 GMT",
"version": "v3"
}
] | 2018-10-02 | [
[
"Frasca",
"Marco",
""
]
] | We derive the critical temperature in a nonlocal Nambu-Jona-Lasinio model with the presence of a chiral chemical potential. The model we consider uses a form factor derived from recent studies of the gluon propagator in Yang-Mills theory and has the property to fit in excellent way the form factor arising from the instanton liquid picture for the vacuum of the theory. Nambu-Jona-Lasinio model is derived form quantum chromodynamics providing all the constants of the theory without any need for fits. We show that the critical temperature in this case always exists and increases as the square of the chiral chemical potential. The expression we obtain for the critical temperature depends on the mass gap that naturally arises from Yang-Mills theory at low-energy as also confirmed by lattice computations. |
1102.2760 | Diego Guadagnoli | Diego Guadagnoli | On the consistency between CP violation in the K vs. Bd systems within
the Standard Model | 1+8 pages, 2 figures, Proceedings of CKM2010, the 6th International
Workshop on the CKM Unitarity Triangle, University of Warwick, UK, 6-10
September 2010 | null | null | LPT Orsay 10-95 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the K and Bd systems, indirect CP violation is quantified by the
parameters epsilon_K and sin 2beta respectively. Within the Standard Model, the
uniqueness of the CP violating phase implies that the measurement of either
between epsilon_K and sin 2beta permits to predict the other. Since both these
parameters are very well measured, this turns into a powerful test of
consistency. I discuss the status of this test, especially in the light of
recent advances on the epsilon_K formula.
| [
{
"created": "Mon, 14 Feb 2011 13:17:29 GMT",
"version": "v1"
}
] | 2011-02-15 | [
[
"Guadagnoli",
"Diego",
""
]
] | In the K and Bd systems, indirect CP violation is quantified by the parameters epsilon_K and sin 2beta respectively. Within the Standard Model, the uniqueness of the CP violating phase implies that the measurement of either between epsilon_K and sin 2beta permits to predict the other. Since both these parameters are very well measured, this turns into a powerful test of consistency. I discuss the status of this test, especially in the light of recent advances on the epsilon_K formula. |
1512.06959 | Motohiko Yoshimura | M. Yoshimura and N. Sasao | Photon and neutrino-pair emission from circulating quantum ions | 18 pages, 9 figures | Phys. Rev. D 93, 113018 (2016) | 10.1103/PhysRevD.93.113018 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent proposal of photon and neutrino pair beam is extensively
investigated. Production rates, both differential and total, of single photon,
two-photon and neutrino-pair emitted from quantum ions in circular motion are
calculated for any velocity of ion. This part is an extension of our previous
results at highest energies to lower energies of circulating ions, and helps
much to identify the new process at a low energy ion ring. We clarify how to
utilize the circulating ion for a new source of coherent neutrino beam despite
of much stronger background photons. Once one verifies that the coherence is
maintained in the initial phases of time evolution after laser irradiation,
large background photon emission rates are not an obstacle against utilizing
the extracted neutrino pair beam.
| [
{
"created": "Tue, 22 Dec 2015 05:19:19 GMT",
"version": "v1"
}
] | 2016-07-06 | [
[
"Yoshimura",
"M.",
""
],
[
"Sasao",
"N.",
""
]
] | The recent proposal of photon and neutrino pair beam is extensively investigated. Production rates, both differential and total, of single photon, two-photon and neutrino-pair emitted from quantum ions in circular motion are calculated for any velocity of ion. This part is an extension of our previous results at highest energies to lower energies of circulating ions, and helps much to identify the new process at a low energy ion ring. We clarify how to utilize the circulating ion for a new source of coherent neutrino beam despite of much stronger background photons. Once one verifies that the coherence is maintained in the initial phases of time evolution after laser irradiation, large background photon emission rates are not an obstacle against utilizing the extracted neutrino pair beam. |
2308.09236 | Vanamali Shastry C | Vanamali Shastry, Wojciech Broniowski, Enrique Ruiz Arriola | Off-shellness in generalized parton distributions and form factors of
the pion | 20 pages, 15 figures; version accepted in PhysRevD | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of off-shellness in the generalized parton distributions
of the pion. On general grounds, these distributions exhibit a richer structure
than in the on-shell case due to absence of the crossing symmetry. In
particular, their moments involve additional terms odd in the skewness
parameter, associated with new form factors. We bring up relations between the
off-shell charge and gravitational form factors, as well as the pion form
factor, and discuss their derivations based on the Ward-Takahashi identities.
We illustrate the features at the (leading-$N_c$) one-quark-loop level with the
help of the spectral quark model of the pion, constructed to embed the vector
meson dominance. Simple analytic expressions for the form factors and the
distributions follow. Thus obtained off-shell generalized parton distributions
are evolved from the quark model scale to higher scales with the LO DGLAP
equations. We evaluate the corresponding Compton amplitudes which enter the
cross-section for the electroproduction of the pion off the proton (the
Sullivan process). It is found in our model that the effects of off-shellness
in the generalized parton distribution are substantial, however, they can be
largely canceled by the corresponding off-shell corrections to the pion
propagator. In particular, this is the case of the Compton form factors
entering the deeply virtual Compton scattering amplitude. As a result, we
expect small off-shellness effects in electroproduction reactions, such as the
Sullivan process.
| [
{
"created": "Fri, 18 Aug 2023 01:47:39 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Nov 2023 03:42:27 GMT",
"version": "v2"
}
] | 2023-11-21 | [
[
"Shastry",
"Vanamali",
""
],
[
"Broniowski",
"Wojciech",
""
],
[
"Arriola",
"Enrique Ruiz",
""
]
] | We study the effects of off-shellness in the generalized parton distributions of the pion. On general grounds, these distributions exhibit a richer structure than in the on-shell case due to absence of the crossing symmetry. In particular, their moments involve additional terms odd in the skewness parameter, associated with new form factors. We bring up relations between the off-shell charge and gravitational form factors, as well as the pion form factor, and discuss their derivations based on the Ward-Takahashi identities. We illustrate the features at the (leading-$N_c$) one-quark-loop level with the help of the spectral quark model of the pion, constructed to embed the vector meson dominance. Simple analytic expressions for the form factors and the distributions follow. Thus obtained off-shell generalized parton distributions are evolved from the quark model scale to higher scales with the LO DGLAP equations. We evaluate the corresponding Compton amplitudes which enter the cross-section for the electroproduction of the pion off the proton (the Sullivan process). It is found in our model that the effects of off-shellness in the generalized parton distribution are substantial, however, they can be largely canceled by the corresponding off-shell corrections to the pion propagator. In particular, this is the case of the Compton form factors entering the deeply virtual Compton scattering amplitude. As a result, we expect small off-shellness effects in electroproduction reactions, such as the Sullivan process. |
1712.06395 | Alexander Machavariani | A.I. Machavariani | On the $\rho^o$-meson production in the inclusive proton-proton
collision | 14 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of the $\rho^o$- meson in the inclusive proton-proton
scattering $p_A+p_B\to \rho^o+X$ is studied using extension of parton model
according to generalized vector meson dominance model (GVMD) in region of small
$Q^2=m_{\rho^o}^2$ and $\rho^o$-meson transverse momentum $\le 1-2GeV/c$. The
realistic description of the experimental cross sections of $p_A+p_B\to
\rho^o+X$ for $4.9\le \sqrt{s}\le 65 GeV$ is achieved using an isotropic
distribution of the $\rho^o$-meson. The resulting density matrix allows one to
select values of the quark masses, which lead to the isotropic distribution of
the emitted meson. It is demonstrated that the same cross sections of the
reaction $p_A+p_B\to\rho^o +X$ for the isotropic distribution of the
$\rho^o$-meson can be obtained with different sets of the quark masses and
corresponding coupling constants of the quark-meson vertex functions.
| [
{
"created": "Mon, 18 Dec 2017 13:41:32 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2018 06:27:48 GMT",
"version": "v2"
}
] | 2018-06-14 | [
[
"Machavariani",
"A. I.",
""
]
] | The production of the $\rho^o$- meson in the inclusive proton-proton scattering $p_A+p_B\to \rho^o+X$ is studied using extension of parton model according to generalized vector meson dominance model (GVMD) in region of small $Q^2=m_{\rho^o}^2$ and $\rho^o$-meson transverse momentum $\le 1-2GeV/c$. The realistic description of the experimental cross sections of $p_A+p_B\to \rho^o+X$ for $4.9\le \sqrt{s}\le 65 GeV$ is achieved using an isotropic distribution of the $\rho^o$-meson. The resulting density matrix allows one to select values of the quark masses, which lead to the isotropic distribution of the emitted meson. It is demonstrated that the same cross sections of the reaction $p_A+p_B\to\rho^o +X$ for the isotropic distribution of the $\rho^o$-meson can be obtained with different sets of the quark masses and corresponding coupling constants of the quark-meson vertex functions. |
2306.17239 | Chih-Ting Lu | Peter Athron, Andrew Fowlie, Chih-Ting Lu, Lachlan Morris, Lei Wu,
Yongcheng Wu, Zhongxiu Xu | Can supercooled phase transitions explain the gravitational wave
background observed by pulsar timing arrays? | 12 pages, 3 figures, Replaced to match published version in PRL | null | 10.1103/PhysRevLett.132.221001 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Several pulsar timing array collaborations recently reported evidence of a
stochastic gravitational wave background (SGWB) at nHz frequencies. Whilst the
SGWB could originate from the merger of supermassive black holes, it could be a
signature of new physics near the 100 MeV scale. Supercooled first-order phase
transitions (FOPTs) that end at the 100 MeV scale are intriguing explanations,
because they could connect the nHz signal to new physics at the electroweak
scale or beyond. Here, however, we provide a clear demonstration that it is not
simple to create a nHz signal from a supercooled phase transition, due to two
crucial issues that could rule out many proposed supercooled explanations and
should be checked. As an example, we use a model based on non-linearly realized
electroweak symmetry that has been cited as evidence for a supercooled
explanation. First, we show that a FOPT cannot complete for the required
transition temperature of around 100 MeV. Such supercooling implies a period of
vacuum domination that hinders bubble percolation and transition completion.
Second, we show that even if completion is not required or if this constraint
is evaded, the Universe typically reheats to the scale of any physics driving
the FOPT. The hierarchy between the transition and reheating temperature makes
it challenging to compute the spectrum of the SGWB.
| [
{
"created": "Thu, 29 Jun 2023 18:09:17 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jul 2023 12:12:43 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Aug 2023 14:11:23 GMT",
"version": "v3"
},
{
"created": "Thu, 16 May 2024 03:25:46 GMT",
"version": "v4"
}
] | 2024-06-05 | [
[
"Athron",
"Peter",
""
],
[
"Fowlie",
"Andrew",
""
],
[
"Lu",
"Chih-Ting",
""
],
[
"Morris",
"Lachlan",
""
],
[
"Wu",
"Lei",
""
],
[
"Wu",
"Yongcheng",
""
],
[
"Xu",
"Zhongxiu",
""
]
] | Several pulsar timing array collaborations recently reported evidence of a stochastic gravitational wave background (SGWB) at nHz frequencies. Whilst the SGWB could originate from the merger of supermassive black holes, it could be a signature of new physics near the 100 MeV scale. Supercooled first-order phase transitions (FOPTs) that end at the 100 MeV scale are intriguing explanations, because they could connect the nHz signal to new physics at the electroweak scale or beyond. Here, however, we provide a clear demonstration that it is not simple to create a nHz signal from a supercooled phase transition, due to two crucial issues that could rule out many proposed supercooled explanations and should be checked. As an example, we use a model based on non-linearly realized electroweak symmetry that has been cited as evidence for a supercooled explanation. First, we show that a FOPT cannot complete for the required transition temperature of around 100 MeV. Such supercooling implies a period of vacuum domination that hinders bubble percolation and transition completion. Second, we show that even if completion is not required or if this constraint is evaded, the Universe typically reheats to the scale of any physics driving the FOPT. The hierarchy between the transition and reheating temperature makes it challenging to compute the spectrum of the SGWB. |
hep-ph/9702303 | Francisco Guerrero | Francisco Guerrero and Joaquim Prades (Valencia) | Kaon Polarizabilities in Chiral Perturbation Theory | 9 pages, Latex, 3 ps figures included | Phys.Lett. B405 (1997) 341-346 | 10.1016/S0370-2693(97)00656-4 | FTUV/97-7, IFIC/97-7 | hep-ph | null | We study the kaon polarizabilities in the framework of Chiral Perturbation
Theory to order $p^4$. For the neutral kaon we find that them vanish and they
have the first non-zero contribution to order $p^6$. We also emphasize the
theoretical potential of an eventual measuremnet of the kaon polarizabilities,
in particular of the neutral kaon ones.
| [
{
"created": "Tue, 11 Feb 1997 11:41:05 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Guerrero",
"Francisco",
"",
"Valencia"
],
[
"Prades",
"Joaquim",
"",
"Valencia"
]
] | We study the kaon polarizabilities in the framework of Chiral Perturbation Theory to order $p^4$. For the neutral kaon we find that them vanish and they have the first non-zero contribution to order $p^6$. We also emphasize the theoretical potential of an eventual measuremnet of the kaon polarizabilities, in particular of the neutral kaon ones. |
hep-ph/9708304 | Antonio Riotto | Antonio Riotto (Fermilab) | Cosmological Implications of Low Energy Supersymmetry Breaking Models | 11 pages, LaTeX file. A couple of references added | Phys.Lett. B413 (1997) 22-29 | 10.1016/S0370-2693(97)01100-3 | FERMILAB-Pub-97/276-A | hep-ph astro-ph | null | We show that stable local cosmic strings are a generic prediction of
supersymmetric models where supersymmetry is broken at scales within a few
orders of magnitude of the weak scale and is fed down to the observable sector
by gauge interactions. The typical energy scale of these strings is about
$10^2$ TeV. Since in the most general and natural scenario there are two
different sources of contributions to ordinary superpartner masses, gauge
mediation from the messanger sector and anomalous U(1) D-terms, novel features
are that the cosmic strings may be superconducting with the role of bosonic
charge carriers played by squarks and sleptons and that some baryonic or
leptonic charge may be stored in the core of the string. Possible cosmological
and astrophysical implications of these superconducting strings are discussed.
| [
{
"created": "Mon, 11 Aug 1997 16:46:59 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Aug 1997 15:10:41 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Riotto",
"Antonio",
"",
"Fermilab"
]
] | We show that stable local cosmic strings are a generic prediction of supersymmetric models where supersymmetry is broken at scales within a few orders of magnitude of the weak scale and is fed down to the observable sector by gauge interactions. The typical energy scale of these strings is about $10^2$ TeV. Since in the most general and natural scenario there are two different sources of contributions to ordinary superpartner masses, gauge mediation from the messanger sector and anomalous U(1) D-terms, novel features are that the cosmic strings may be superconducting with the role of bosonic charge carriers played by squarks and sleptons and that some baryonic or leptonic charge may be stored in the core of the string. Possible cosmological and astrophysical implications of these superconducting strings are discussed. |
1812.03348 | Haitao Li | Hai Tao Li and Ivan Vitev | Jet splitting functions in the vacuum and in a QCD medium | 4 pages, 4 figures, Proceedings of Hard Probes 2018, 30 September-5
October, Aix-Les-Bains, France | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-prong structure related to the leading subjets inside a reconstructed
jet opens new avenues toward precision constraints on the in-medium
modification of parton showers. In this talk, we present the first resummed
calculation of the soft-dropped groomed momentum sharing distribution, or the
jet splitting function, in heavy-ion collisions for both light jets and heavy
flavor tagged jets. Existing light jet splitting function data from the STAR
experiment at RHIC and the CMS experiment at LHC can be understood in the
unified framework of soft-collinear effective theory with Glauber gluon
interactions. For heavy flavor jets, very interestingly, the momentum sharing
distribution of b-tagged jets is more strongly modified in comparison to the
one for light jets, which provides a novel handle on mass corrections to
in-medium parton showers that are at present difficult to constraint using
inclusive heavy meson production.
| [
{
"created": "Sat, 8 Dec 2018 16:39:17 GMT",
"version": "v1"
}
] | 2018-12-11 | [
[
"Li",
"Hai Tao",
""
],
[
"Vitev",
"Ivan",
""
]
] | The two-prong structure related to the leading subjets inside a reconstructed jet opens new avenues toward precision constraints on the in-medium modification of parton showers. In this talk, we present the first resummed calculation of the soft-dropped groomed momentum sharing distribution, or the jet splitting function, in heavy-ion collisions for both light jets and heavy flavor tagged jets. Existing light jet splitting function data from the STAR experiment at RHIC and the CMS experiment at LHC can be understood in the unified framework of soft-collinear effective theory with Glauber gluon interactions. For heavy flavor jets, very interestingly, the momentum sharing distribution of b-tagged jets is more strongly modified in comparison to the one for light jets, which provides a novel handle on mass corrections to in-medium parton showers that are at present difficult to constraint using inclusive heavy meson production. |
hep-ph/9412255 | Daniel De Florian | D. de Florian and R. Sassot | ${\cal O}(\alpha_{s})$ Spin-Dependent Weak Structure Functions | 20 pages, revtex, feynman.tex, 5 uuencoded figures | Phys.Rev.D51:6052-6058,1995 | 10.1103/PhysRevD.51.6052 | La Plata Preprint 11-94 | hep-ph | null | The complete next to leading logarithmic (${\cal O}(\alpha_{s})$) corrections
to the spin dependent weak deep inelastic structure functions $g_{1},g_{3}$ and
$g_{4}$, are calculated using dimensional regularization within the HVBM
method. Analysing the quark and gluon initiated contributions to these
corrections for different values for the quark masses, a consistent
factorization prescription for spin dependent quark distributions, which safely
removes soft contributions, is defined. It is shown that within this scheme,
quark initiated corrections are comparable in magnitude to those of gluonic
origin, even though their contributions to the moments are small.
| [
{
"created": "Wed, 7 Dec 1994 19:02:58 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"de Florian",
"D.",
""
],
[
"Sassot",
"R.",
""
]
] | The complete next to leading logarithmic (${\cal O}(\alpha_{s})$) corrections to the spin dependent weak deep inelastic structure functions $g_{1},g_{3}$ and $g_{4}$, are calculated using dimensional regularization within the HVBM method. Analysing the quark and gluon initiated contributions to these corrections for different values for the quark masses, a consistent factorization prescription for spin dependent quark distributions, which safely removes soft contributions, is defined. It is shown that within this scheme, quark initiated corrections are comparable in magnitude to those of gluonic origin, even though their contributions to the moments are small. |
2209.09585 | Roman Zwicky | Saad Nabeebaccus and Roman Zwicky | On the $ R_{K} $ Theory Error | CKM21 proceedings 8pp | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | To quantify the theory error on $R_K$, essentially means to quantify the
uncertainty due to QED corrections since the latter breaks lepton flavour
universality through the lepton masses. Since experiment uses photon shower
programs, e.g. \texttt{PHOTOS}, to capture QED effects, assessing the
uncertainty involves investigating effects not captured by the specific use of
these tools. This includes structure-dependent corrections, potentially large
non-logarithmic terms and charmonium resonances entering the lower bin by
migration of radiation. We are able to close in on these loopholes. For
example, using gauge invariance, we show that structure-dependent QED
corrections do not lead to additional (sizeable) hard-collinear logs of the
form ${\cal O}(\alpha) \ln m_\ell/m_B$. Hence, from the theory point of view
$R_K$ is a safe observable.
| [
{
"created": "Tue, 20 Sep 2022 09:58:15 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Nabeebaccus",
"Saad",
""
],
[
"Zwicky",
"Roman",
""
]
] | To quantify the theory error on $R_K$, essentially means to quantify the uncertainty due to QED corrections since the latter breaks lepton flavour universality through the lepton masses. Since experiment uses photon shower programs, e.g. \texttt{PHOTOS}, to capture QED effects, assessing the uncertainty involves investigating effects not captured by the specific use of these tools. This includes structure-dependent corrections, potentially large non-logarithmic terms and charmonium resonances entering the lower bin by migration of radiation. We are able to close in on these loopholes. For example, using gauge invariance, we show that structure-dependent QED corrections do not lead to additional (sizeable) hard-collinear logs of the form ${\cal O}(\alpha) \ln m_\ell/m_B$. Hence, from the theory point of view $R_K$ is a safe observable. |
2402.18738 | Jamie M. Karthein | Jamie M. Karthein | QCD at Finite Temperature and Density -- Equation of State | Contribution to Quark Matter 2023, 6 pages, 1 figure | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As an important set of thermodynamic quantities, knowledge of the equation of
state over a broad range of temperatures and chemical potentials in the QCD
phase diagram is crucial for our understanding of strongly-interacting matter.
There is a good understanding from first-principles results in lattice QCD,
perturbative QCD and chiral effective field theory about the equation of state.
However, these approaches are valid in different regimes of the phase diagram,
and therefore, a method of providing an equation of state that covers a full
range of the phase diagram involves matching together these results with
appropriate models in order to fill in the gaps between these regions.
Furthermore, with such equations of state, important questions about QCD phase
structure can begin to be addressed, such as whether there is a critical point
in the QCD phase diagram. In this contribution to the proceedings, equations of
state from first-principles and effective theories will be discussed in order
to understand how QCD thermodynamics is affected by the presence of a critical
point.
| [
{
"created": "Wed, 28 Feb 2024 22:37:52 GMT",
"version": "v1"
}
] | 2024-03-01 | [
[
"Karthein",
"Jamie M.",
""
]
] | As an important set of thermodynamic quantities, knowledge of the equation of state over a broad range of temperatures and chemical potentials in the QCD phase diagram is crucial for our understanding of strongly-interacting matter. There is a good understanding from first-principles results in lattice QCD, perturbative QCD and chiral effective field theory about the equation of state. However, these approaches are valid in different regimes of the phase diagram, and therefore, a method of providing an equation of state that covers a full range of the phase diagram involves matching together these results with appropriate models in order to fill in the gaps between these regions. Furthermore, with such equations of state, important questions about QCD phase structure can begin to be addressed, such as whether there is a critical point in the QCD phase diagram. In this contribution to the proceedings, equations of state from first-principles and effective theories will be discussed in order to understand how QCD thermodynamics is affected by the presence of a critical point. |
hep-ph/0305069 | Casalbuoni | Roberto Casalbuoni and Giuseppe Nardulli | Inhomogeneous Superconductivity in Condensed Matter and QCD | RevTex, 83 pages, 26 figures. Submitted to Review of Modern Physics | Rev.Mod.Phys.76:263-320,2004 | 10.1103/RevModPhys.76.263 | CERN-TH/2003-082 | hep-ph cond-mat nucl-th | null | Inhomogeneous superconductivity arises when the species participating in the
pairing phenomenon have different Fermi surfaces with a large enough
separation. In these conditions it could be more favorable for each of the
pairing fermions to stay close to its Fermi surface and, differently from the
usual BCS state, for the Cooper pair to have a non zero total momentum. For
this reason in this state the gap varies in space, the ground state is
inhomogeneous and a crystalline structure might be formed. This situation was
considered for the first time by Fulde, Ferrell, Larkin and Ovchinnikov, and
the corresponding state is called LOFF. The spontaneous breaking of the space
symmetries in the vacuum state is a characteristic feature of this phase and is
associated to the presence of long wave-length excitations of zero mass. The
situation described here is of interest both in solid state and in elementary
particle physics, in particular in Quantum Chromo-Dynamics at high density and
small temperature. In this review we present the theoretical approach to the
LOFF state and its phenomenological applications using the language of the
effective field theories.
| [
{
"created": "Wed, 7 May 2003 10:57:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Casalbuoni",
"Roberto",
""
],
[
"Nardulli",
"Giuseppe",
""
]
] | Inhomogeneous superconductivity arises when the species participating in the pairing phenomenon have different Fermi surfaces with a large enough separation. In these conditions it could be more favorable for each of the pairing fermions to stay close to its Fermi surface and, differently from the usual BCS state, for the Cooper pair to have a non zero total momentum. For this reason in this state the gap varies in space, the ground state is inhomogeneous and a crystalline structure might be formed. This situation was considered for the first time by Fulde, Ferrell, Larkin and Ovchinnikov, and the corresponding state is called LOFF. The spontaneous breaking of the space symmetries in the vacuum state is a characteristic feature of this phase and is associated to the presence of long wave-length excitations of zero mass. The situation described here is of interest both in solid state and in elementary particle physics, in particular in Quantum Chromo-Dynamics at high density and small temperature. In this review we present the theoretical approach to the LOFF state and its phenomenological applications using the language of the effective field theories. |
2104.11765 | Yossathorn Tawabutr | Yuri V. Kovchegov, Andrey Tarasov, Yossathorn Tawabutr | Helicity Evolution at Small $x$: the Single-Logarithmic Contribution | Edited for minor typos. 43 pages, 10 figures | null | 10.1007/JHEP03(2022)184 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We calculate single-logarithmic corrections to the small-$x$ flavor-singlet
helicity evolution equations derived recently in the double-logarithmic
approximation. The new single-logarithmic part of the evolution kernel sums up
powers of $\alpha_s \ln(1/x)$, which are an important correction to the
dominant powers of $\alpha_s \ln^2(1/x)$ summed up by the double-logarithmic
kernel at small values of Bjorken $x$ and with $\alpha_s$ the strong coupling
constant. The single-logarithmic terms arise separately from either the
longitudinal or transverse momentum integrals. Consequently, the evolution
equations we derive employing the light-cone perturbation theory simultaneously
include the small-$x$ evolution kernel and the leading-order polarized DGLAP
splitting functions. We further enhance the equations by calculating the
running coupling corrections to the kernel.
| [
{
"created": "Fri, 23 Apr 2021 18:10:00 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Mar 2022 05:09:50 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Mar 2022 00:07:11 GMT",
"version": "v3"
}
] | 2022-04-08 | [
[
"Kovchegov",
"Yuri V.",
""
],
[
"Tarasov",
"Andrey",
""
],
[
"Tawabutr",
"Yossathorn",
""
]
] | We calculate single-logarithmic corrections to the small-$x$ flavor-singlet helicity evolution equations derived recently in the double-logarithmic approximation. The new single-logarithmic part of the evolution kernel sums up powers of $\alpha_s \ln(1/x)$, which are an important correction to the dominant powers of $\alpha_s \ln^2(1/x)$ summed up by the double-logarithmic kernel at small values of Bjorken $x$ and with $\alpha_s$ the strong coupling constant. The single-logarithmic terms arise separately from either the longitudinal or transverse momentum integrals. Consequently, the evolution equations we derive employing the light-cone perturbation theory simultaneously include the small-$x$ evolution kernel and the leading-order polarized DGLAP splitting functions. We further enhance the equations by calculating the running coupling corrections to the kernel. |
2008.03666 | Feng Yuan | Xiaohui Liu, Felix Ringer, Werner Vogelsang, Feng Yuan | Factorization and its Breaking in Dijet Single Transverse Spin
Asymmetries in $pp$ Collisions | 45 pages, 18 figures | Phys. Rev. D 102, 114012 (2020) | 10.1103/PhysRevD.102.114012 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study factorization in single transverse spin asymmetries for dijet
production in proton-proton collisions, by considering soft gluon radiation at
one-loop order. We show that the associated transverse momentum dependent (TMD)
factorization is valid at the leading logarithmic level. At
next-to-leading-logarithmic (NLL) accuracy, however, we find that soft gluon
radiation generates terms in the single transverse spin dependent cross section
that differ from those known for the unpolarized case. As a consequence, these
terms cannot be organized in terms of a spin independent soft factor in the
factorization formula. We present leading logarithmic predictions for the
single transverse spin dijet asymmetry for $pp$ collisions at RHIC, based on
quark Sivers functions constrained by semi-inclusive deep inelastic scattering
data. We hope that our results will contribute to a better understanding of TMD
factorization breaking effects at NLL accuracy and beyond.
| [
{
"created": "Sun, 9 Aug 2020 05:55:46 GMT",
"version": "v1"
}
] | 2021-01-04 | [
[
"Liu",
"Xiaohui",
""
],
[
"Ringer",
"Felix",
""
],
[
"Vogelsang",
"Werner",
""
],
[
"Yuan",
"Feng",
""
]
] | We study factorization in single transverse spin asymmetries for dijet production in proton-proton collisions, by considering soft gluon radiation at one-loop order. We show that the associated transverse momentum dependent (TMD) factorization is valid at the leading logarithmic level. At next-to-leading-logarithmic (NLL) accuracy, however, we find that soft gluon radiation generates terms in the single transverse spin dependent cross section that differ from those known for the unpolarized case. As a consequence, these terms cannot be organized in terms of a spin independent soft factor in the factorization formula. We present leading logarithmic predictions for the single transverse spin dijet asymmetry for $pp$ collisions at RHIC, based on quark Sivers functions constrained by semi-inclusive deep inelastic scattering data. We hope that our results will contribute to a better understanding of TMD factorization breaking effects at NLL accuracy and beyond. |
1901.06445 | Stephen Adler | Stephen L. Adler | Soft Pions and More | Latex, 13 pages. Talk at the Symposium "The Standard Model at 50
Years", Case Western Reserve University, June 1, 2018 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review the role that soft pion theorems, current algebras, sum rules, and
anomalies played in the foundation of the standard model.
| [
{
"created": "Sat, 19 Jan 2019 00:07:09 GMT",
"version": "v1"
}
] | 2019-01-23 | [
[
"Adler",
"Stephen L.",
""
]
] | I review the role that soft pion theorems, current algebras, sum rules, and anomalies played in the foundation of the standard model. |
hep-ph/0210168 | Stefan Dittmaier | Stefan Dittmaier and Markus Roth | Six-fermion production at e+e- colliders | 7 pages, latex, 4 eps files, to appear in the proceedings of the
"International Workshop on Linear Colliders", August 26-30, 2002, Jeju
Island, Korea | Nucl.Phys.Proc.Suppl. 116 (2003) 38-42 | 10.1016/S0920-5632(03)80140-8 | MPI-PhT/2002-56, KA-TP-16-2002 | hep-ph | null | The class of six-fermion production processes at e+e- colliders comprises
very interesting particle reactions, such as the production of top-quark pairs
and of Higgs bosons in the intermediate Higgs mass range, the scattering of
massive gauge bosons, and triple gauge-boson production. The Monte Carlo event
generator LUSIFER is designed for the analysis of such processes. A few
illustrating results obtained with LUSIFER are discussed.
| [
{
"created": "Thu, 10 Oct 2002 19:32:33 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dittmaier",
"Stefan",
""
],
[
"Roth",
"Markus",
""
]
] | The class of six-fermion production processes at e+e- colliders comprises very interesting particle reactions, such as the production of top-quark pairs and of Higgs bosons in the intermediate Higgs mass range, the scattering of massive gauge bosons, and triple gauge-boson production. The Monte Carlo event generator LUSIFER is designed for the analysis of such processes. A few illustrating results obtained with LUSIFER are discussed. |
hep-ph/9711209 | Yang Ya-Dong | Dongsheng Du, Hongying Jin, Yadong Yang | Reexamination of the resonance contributions in B->X_s e^+ e^- | Revtex file,11 pages,1 figures,Phys.Lett.B in press | Phys.Lett. B417 (1998) 347-352 | 10.1016/S0370-2693(97)01235-5 | BIHEP-TH/97-04 | hep-ph | null | With help of the recent developments in the heavy quarkonium physics, we
reexamine the long distance(LD) effects in \Bsee dominantly from the charmonium
resonances $J/\Psi$ and $\Psi^{\prime}$ through the decay chains $B\ra X_s
J/\Psi (\Psi^{\prime}) \ra X_s e^+ e^-$. We find that the resonance to
nonresonance interference are reduced substantially.
| [
{
"created": "Mon, 3 Nov 1997 13:23:52 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Du",
"Dongsheng",
""
],
[
"Jin",
"Hongying",
""
],
[
"Yang",
"Yadong",
""
]
] | With help of the recent developments in the heavy quarkonium physics, we reexamine the long distance(LD) effects in \Bsee dominantly from the charmonium resonances $J/\Psi$ and $\Psi^{\prime}$ through the decay chains $B\ra X_s J/\Psi (\Psi^{\prime}) \ra X_s e^+ e^-$. We find that the resonance to nonresonance interference are reduced substantially. |
1411.7486 | Neetika Sharma | Neetika Sharma | Generalized parton distributions in the soft-wall model of AdS/QCD | null | Phys. Rev. D 90, 095024 (2014) | 10.1103/PhysRevD.90.095024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a numerical analysis of helicity independent nucleon generalized
parton distributions (GPDs) using the known formalism based on inclusion of
higher Fock states in the soft-wall approach of the anti-de Sitter/QCD model.
We calculate the momentum space GPDs by matching the electromagnetic form
factors in the AdS model to the sum rules in QCD. We investigate their Mellin
moments, transverse impact parameter GPDs, transverse mean square radius, and
transverse width. We further extend this work to investigate the charge and
anomalous magnetization densities for both unpolarized and transversely
polarized nucleons. A comparison of results on density functions with
phenomenological parametrization is also presented.
| [
{
"created": "Thu, 27 Nov 2014 07:02:47 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Sharma",
"Neetika",
""
]
] | We present a numerical analysis of helicity independent nucleon generalized parton distributions (GPDs) using the known formalism based on inclusion of higher Fock states in the soft-wall approach of the anti-de Sitter/QCD model. We calculate the momentum space GPDs by matching the electromagnetic form factors in the AdS model to the sum rules in QCD. We investigate their Mellin moments, transverse impact parameter GPDs, transverse mean square radius, and transverse width. We further extend this work to investigate the charge and anomalous magnetization densities for both unpolarized and transversely polarized nucleons. A comparison of results on density functions with phenomenological parametrization is also presented. |
1406.4104 | Giulio Maria Pelaggi | Giulio Maria Pelaggi | Predictions of a model of weak scale from dynamical breaking of scale
invariance | null | Nuclear Physics B 893 (2015) 443 | 10.1016/j.nuclphysb.2015.01.025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a model where the weak and the DM scale arise at one loop from
the Coleman-Weinberg mechanism. We perform a precision computation of the model
predictions for the production cross section of a new Higgs-like scalar and for
the direct detection cross section of the DM particle candidate.
| [
{
"created": "Mon, 16 Jun 2014 19:14:17 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Jul 2014 13:37:12 GMT",
"version": "v2"
},
{
"created": "Tue, 19 May 2015 08:29:18 GMT",
"version": "v3"
}
] | 2015-05-20 | [
[
"Pelaggi",
"Giulio Maria",
""
]
] | We consider a model where the weak and the DM scale arise at one loop from the Coleman-Weinberg mechanism. We perform a precision computation of the model predictions for the production cross section of a new Higgs-like scalar and for the direct detection cross section of the DM particle candidate. |
1710.00691 | Wei-Min Yang | Wei-Min Yang | Neutrino Mass, Leptogenesis, and Dark Matter from The Dark Sector with
$U(1)_{D}$ | 18 pages, 4 figures, to be published by JHEP. arXiv admin note: text
overlap with arXiv:1706.07235 | null | 10.1007/JHEP03(2018)144 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I suggest a new extension of the SM by introducing a dark sector which has
several new particles and a local $U(1)_{D}$ symmetry. The dark particles bring
about the new and interesting physics beyond the SM. The model can generate the
tiny neutrino mass by a hybrid see-saw mechanism, achieve the leptogenesis at
the TeV scale, and account for the cold dark matter. All of the three things
collectively arise from the dark sector. In particular, it is very feasible to
test the model predictions and probe the dark sector in near future
experiments.
| [
{
"created": "Fri, 29 Sep 2017 11:02:54 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Dec 2017 02:54:57 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Mar 2018 06:10:23 GMT",
"version": "v3"
}
] | 2020-05-20 | [
[
"Yang",
"Wei-Min",
""
]
] | I suggest a new extension of the SM by introducing a dark sector which has several new particles and a local $U(1)_{D}$ symmetry. The dark particles bring about the new and interesting physics beyond the SM. The model can generate the tiny neutrino mass by a hybrid see-saw mechanism, achieve the leptogenesis at the TeV scale, and account for the cold dark matter. All of the three things collectively arise from the dark sector. In particular, it is very feasible to test the model predictions and probe the dark sector in near future experiments. |
1604.07712 | Hiroyuki Ishida | Hiroyuki Ishida, Shinya Matsuzaki, Yuya Yamaguchi | Invisible Axion-Like Dark Matter from Electroweak Bosonic Seesaw | 23 pages, 2 figures, v2: correspond to the published version accepted
in PRD | Phys. Rev. D 94, 095011 (2016) | 10.1103/PhysRevD.94.095011 | SU-HET-02-2016 | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a model based on the classically-scale invariant standard model
(SM) with a strongly coupled vector-like dynamics, which is called hypercolor
(HC). The scale symmetry is dynamically broken by the vector-like condensation
at the TeV scale, so that the SM Higgs acquires the negative mass-squared by
the bosonic seesaw mechanism to realize the electroweak symmetry breaking. An
elementary pseudoscalar $S$ is introduced to give masses for the composite
Nambu-Goldstone bosons (HC pions): the HC pion can be a good target to explore
through a diphoton channel at the LHC. As the consequence of the bosonic
seesaw, the fluctuating mode of $S$, which we call $s$, develops tiny couplings
to the SM particles and is predicted to be very light. The $s$ predominantly
decays to diphoton and can behave as an invisible axion-like dark matter. The
mass of the $s$-dark matter is constrained by currently available cosmological
and astrophysical limits to be $10^{-4} {\rm eV} \lesssim m_s \lesssim 1 \,{\rm
eV}$. We find that the sufficient amount of relic abundance for the $s$-dark
matter can be accumulated via the coherent oscillation. The detection potential
in microwave cavity experiments is also addressed.
| [
{
"created": "Tue, 26 Apr 2016 15:15:56 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2016 08:02:50 GMT",
"version": "v2"
}
] | 2016-11-15 | [
[
"Ishida",
"Hiroyuki",
""
],
[
"Matsuzaki",
"Shinya",
""
],
[
"Yamaguchi",
"Yuya",
""
]
] | We explore a model based on the classically-scale invariant standard model (SM) with a strongly coupled vector-like dynamics, which is called hypercolor (HC). The scale symmetry is dynamically broken by the vector-like condensation at the TeV scale, so that the SM Higgs acquires the negative mass-squared by the bosonic seesaw mechanism to realize the electroweak symmetry breaking. An elementary pseudoscalar $S$ is introduced to give masses for the composite Nambu-Goldstone bosons (HC pions): the HC pion can be a good target to explore through a diphoton channel at the LHC. As the consequence of the bosonic seesaw, the fluctuating mode of $S$, which we call $s$, develops tiny couplings to the SM particles and is predicted to be very light. The $s$ predominantly decays to diphoton and can behave as an invisible axion-like dark matter. The mass of the $s$-dark matter is constrained by currently available cosmological and astrophysical limits to be $10^{-4} {\rm eV} \lesssim m_s \lesssim 1 \,{\rm eV}$. We find that the sufficient amount of relic abundance for the $s$-dark matter can be accumulated via the coherent oscillation. The detection potential in microwave cavity experiments is also addressed. |
hep-ph/9703448 | Marc Knecht | L. Girlanda, M. Knecht, B. Moussallam, J. Stern | Comment on the Prediction of Two-loop Standard Chiral Perturbation
Theory for Low-Energy \pi\pi Scattering | 14 pages, Latex209, 2 figures | Phys.Lett. B409 (1997) 461-468 | 10.1016/S0370-2693(97)00872-1 | CPT-97/P.3470, IPNO/TH 97-08 | hep-ph | null | Four of the six parameters defining the two-loop \pi\pi scattering amplitude
have been determined using Roy dispersion relations. Combining this information
with the Standard \chi PT expressions, we obtain the threshold parameters,
low-energy phases and the O(p^4) constants $l_1^r, l_2^r$. The result $l_2^r (
M_{\rho} ) = ( 1.6 \pm 0.4 \pm 0.9 ) \times 10^{-3} ( {\bar l_2} = 4.17 \pm
0.19 \pm 0.43$) reproduces the correct D-waves but it is incompatible with
existing Standard \chi PT analyses of $K_{l4}$ form factors beyond one loop.
| [
{
"created": "Thu, 27 Mar 1997 19:09:24 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Girlanda",
"L.",
""
],
[
"Knecht",
"M.",
""
],
[
"Moussallam",
"B.",
""
],
[
"Stern",
"J.",
""
]
] | Four of the six parameters defining the two-loop \pi\pi scattering amplitude have been determined using Roy dispersion relations. Combining this information with the Standard \chi PT expressions, we obtain the threshold parameters, low-energy phases and the O(p^4) constants $l_1^r, l_2^r$. The result $l_2^r ( M_{\rho} ) = ( 1.6 \pm 0.4 \pm 0.9 ) \times 10^{-3} ( {\bar l_2} = 4.17 \pm 0.19 \pm 0.43$) reproduces the correct D-waves but it is incompatible with existing Standard \chi PT analyses of $K_{l4}$ form factors beyond one loop. |
hep-ph/9604432 | Douglas Ross | John Ellis and Douglas Ross | Virtual-Sparticle Threshold Effects on Large E_T Jet Cross Sections | 8 pages, uses epsf.sty, 5 figures; New version to be published in
Phys. Letts. B: We have displayed the corrections to cross sections for
various different scattering angles as opposed to different t. We have
corrected certain erroneous statements concerning the high energy behaviour
of the corrections | Phys.Lett.B383:187-192,1996 | 10.1016/0370-2693(96)00719-8 | CERN-TH/96-108, SHEP-96-10 | hep-ph | null | We discuss the one-loop virtual-sparticle corrections to QCD jet cross
sections at large $E_T$ and large dijet invariant masses, with reference to
present Tevatron and future LHC collider experiments. We find characteristic
peaks and dips in the sparticle threshold region, due to interferences with
tree-level QCD diagrams. Their magnitudes may be several per cent of the total
jet cross section, so they might provide a useful search tool that is
complementary to the usual missing-energy signature for supersymmetry.
| [
{
"created": "Mon, 29 Apr 1996 16:44:10 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 1996 17:06:58 GMT",
"version": "v2"
}
] | 2009-09-11 | [
[
"Ellis",
"John",
""
],
[
"Ross",
"Douglas",
""
]
] | We discuss the one-loop virtual-sparticle corrections to QCD jet cross sections at large $E_T$ and large dijet invariant masses, with reference to present Tevatron and future LHC collider experiments. We find characteristic peaks and dips in the sparticle threshold region, due to interferences with tree-level QCD diagrams. Their magnitudes may be several per cent of the total jet cross section, so they might provide a useful search tool that is complementary to the usual missing-energy signature for supersymmetry. |
hep-ph/0111371 | A. Perez-Lorenzana | G. Germ\'an, Anupam Mazumdar and A. P\'erez-Lorenzana | Angular Inflation from Supergravity | 7 pages, one figure. Final version. Title changed, two figures
dropped | Mod.Phys.Lett.A17:1627-1634,2002 | 10.1142/S0217732302008022 | null | hep-ph | null | We study supergravity inflationary models where inflation is produced along
the angular direction. For this we express the scalar component of a chiral
superfield in terms of the radial and the angular components. We then express
the supergravity potential in a form particularly simple for calculations
involving polynomial expressions for the superpotential and Kahler potential.
We show for a simple Polonyi model the angular direction may give rise to a
stage of inflation when the radial field is fixed to its minimum. We obtain
analytical expressions for all the relevant inflationary quantities and discuss
the possibility of supersymmetry breaking in the radial direction while
inflating by the angular component.
| [
{
"created": "Wed, 28 Nov 2001 12:00:17 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2002 10:41:03 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Germán",
"G.",
""
],
[
"Mazumdar",
"Anupam",
""
],
[
"Pérez-Lorenzana",
"A.",
""
]
] | We study supergravity inflationary models where inflation is produced along the angular direction. For this we express the scalar component of a chiral superfield in terms of the radial and the angular components. We then express the supergravity potential in a form particularly simple for calculations involving polynomial expressions for the superpotential and Kahler potential. We show for a simple Polonyi model the angular direction may give rise to a stage of inflation when the radial field is fixed to its minimum. We obtain analytical expressions for all the relevant inflationary quantities and discuss the possibility of supersymmetry breaking in the radial direction while inflating by the angular component. |
hep-ph/9811208 | Narison | Stephan Narison (Univ. Montpellier) | Extracting m_c(M_c) and f_{D_s,B} from the pseudoscalar sum rules | Latex2e sources 5 pages including 2 PS figures and 1 Table. Talk
given at the QCD 98 Euroconference-Montpellier (2-8th July1998) | Nucl.Phys.Proc.Suppl. 74 (1999) 304-308 | 10.1016/S0920-5632(99)00183-8 | Montpellier preprint PM/98-36 | hep-ph hep-ex hep-lat | null | I report here on the (first) direct extraction of the running charm quark
mass m_c(\nu) from the D-meson sum rules, and on the implications of this
result for the estimate of the leptonic decay constants f_{D_s}. The outputs:
m_c(M_c)=(1.08\pm 0.11) GeV, f_{D}= (1.52\pm 0.16)f_\pi, f_{D_s}= (1.75\pm
0.18)f_\pi and f_B=(1.44\pm 0.07)f_\pi are in good agreement with the existing
sum rule results obtained using the pole mass. In particular, the result
f_D\approx f_B supports early '87 sum rule results \cite{SNFB}, which indicated
a huge 1/m correction to the heavy quark symmetry expectation. This talk is
based on the paper hep-ph/9712386 and updates the discussions given there.
| [
{
"created": "Sun, 1 Nov 1998 11:00:57 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Narison",
"Stephan",
"",
"Univ. Montpellier"
]
] | I report here on the (first) direct extraction of the running charm quark mass m_c(\nu) from the D-meson sum rules, and on the implications of this result for the estimate of the leptonic decay constants f_{D_s}. The outputs: m_c(M_c)=(1.08\pm 0.11) GeV, f_{D}= (1.52\pm 0.16)f_\pi, f_{D_s}= (1.75\pm 0.18)f_\pi and f_B=(1.44\pm 0.07)f_\pi are in good agreement with the existing sum rule results obtained using the pole mass. In particular, the result f_D\approx f_B supports early '87 sum rule results \cite{SNFB}, which indicated a huge 1/m correction to the heavy quark symmetry expectation. This talk is based on the paper hep-ph/9712386 and updates the discussions given there. |
hep-ph/9412332 | My Account | J. Lopez and D. Nanopoulos | String no-scale supergravity | 36 pages, Latex, no figures. Significantly expanded to include
explicit calculation of the twisted sector Kahler potential and its
consequences | Int.J.Mod.Phys. A11 (1996) 3439-3478 | 10.1142/S0217751X96001644 | CERN-TH.7519/94 | hep-ph hep-th | null | We explore the postulates of string no-scale supergravity in the context of
free-fermionic string models. The requirements of vanishing vacuum energy, flat
directions of the scalar potential, and stable no-scale mechanism impose strong
restrictions on possible string no-scale models, which must possess only two or
three moduli, and a constrained massless spectrum. The
soft-supersymmetry-breaking parameters involving all twisted and untwisted
fields are given explicitly. This class of models contain no free parameters,
\ie, in principle all supersymmetric particle masses and interactions are
completely determined. A computerized search for free-fermionic models with the
desired properties yields a candidate $SU(5)\times U(1)$ model containing extra
(\r{10},\rb{10}) matter representations that allow gauge coupling unification
at the string scale. Our candidate model possesses a bening non-universal
assignment of supersymmetry breaking scalar masses, which may have interesting
low-energy experimental consequences.
| [
{
"created": "Tue, 20 Dec 1994 14:42:52 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Feb 1995 16:24:27 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Lopez",
"J.",
""
],
[
"Nanopoulos",
"D.",
""
]
] | We explore the postulates of string no-scale supergravity in the context of free-fermionic string models. The requirements of vanishing vacuum energy, flat directions of the scalar potential, and stable no-scale mechanism impose strong restrictions on possible string no-scale models, which must possess only two or three moduli, and a constrained massless spectrum. The soft-supersymmetry-breaking parameters involving all twisted and untwisted fields are given explicitly. This class of models contain no free parameters, \ie, in principle all supersymmetric particle masses and interactions are completely determined. A computerized search for free-fermionic models with the desired properties yields a candidate $SU(5)\times U(1)$ model containing extra (\r{10},\rb{10}) matter representations that allow gauge coupling unification at the string scale. Our candidate model possesses a bening non-universal assignment of supersymmetry breaking scalar masses, which may have interesting low-energy experimental consequences. |
1503.08908 | Kai Schmitz | Kai Schmitz | Leptogenesis during Axion Relaxation after Inflation | 5 pages, 4 figures. Prepared for the proceedings of the 2nd Toyama
International Workshop on Higgs as a Probe of New Physics (HPNP 2015),
February 11-15, 2015 | null | null | IPMU 15-0036 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I present a novel and minimal alternative to thermal
leptogenesis, which builds upon the assumption that the electroweak gauge
bosons are coupled to an axion-like scalar field, as it is, for instance, the
case in certain string compactifications. The motion of this axion-like field
after the end of inflation generates an effective chemical potential for
leptons and antileptons, which, in the presence of lepton number-violating
scatterings mediated by heavy Majorana neutrinos, provides an opportunity for
baryogenesis via leptogenesis. In contrast to thermal leptogenesis, the final
baryon asymmetry turns out to be insensitive to the masses and CP-violating
phases in the heavy neutrino sector. Moreover, the proposed scenario requires a
reheating temperature of at least O(10^12) GeV and it is, in particular,
consistent with heavy neutrino masses close the scale of grand unification.
This talk was given in February 2015 at HPNP 2015 at Toyama University and is
based on recent work (arXiv:1412.2043 [hep-ph]) in collaboration with A.
Kusenko and T. T. Yanagida.
| [
{
"created": "Tue, 31 Mar 2015 04:32:46 GMT",
"version": "v1"
}
] | 2015-04-01 | [
[
"Schmitz",
"Kai",
""
]
] | In this talk, I present a novel and minimal alternative to thermal leptogenesis, which builds upon the assumption that the electroweak gauge bosons are coupled to an axion-like scalar field, as it is, for instance, the case in certain string compactifications. The motion of this axion-like field after the end of inflation generates an effective chemical potential for leptons and antileptons, which, in the presence of lepton number-violating scatterings mediated by heavy Majorana neutrinos, provides an opportunity for baryogenesis via leptogenesis. In contrast to thermal leptogenesis, the final baryon asymmetry turns out to be insensitive to the masses and CP-violating phases in the heavy neutrino sector. Moreover, the proposed scenario requires a reheating temperature of at least O(10^12) GeV and it is, in particular, consistent with heavy neutrino masses close the scale of grand unification. This talk was given in February 2015 at HPNP 2015 at Toyama University and is based on recent work (arXiv:1412.2043 [hep-ph]) in collaboration with A. Kusenko and T. T. Yanagida. |
2205.11548 | Jorge Segovia | Gang Yang, Jialun Ping and Jorge Segovia | Fully-charm and -bottom pentaquarks in a Lattice-QCD inspired quark
model | 12 pages, 7 figures, 12 tables | null | 10.1103/PhysRevD.106.014005 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fully-charm and -bottom pentaquarks, \emph{i.e.} $cccc\bar{c}$ and
$bbbb\bar{b}$, with spin-parity quantum numbers $J^P=\frac{1}{2}^-$,
$\frac{3}{2}^-$ and $\frac{5}{2}^-$, are investigated within a Lattice-QCD
inspired quark model, which has already successfully described the recently
announced fully-charm tetraquark candidate $X(6900)$, and has also predicted
several other fully-heavy tetraquarks. A powerful computational technique,
based on the Gaussian expansion method combined with a complex-scaling range
approach, is employed to predict, and distinguish, bound, resonance and
scattering states of the mentioned five-body system. Both baryon-meson and
diquark-diquark-antiquark configurations, along with all of their possible
color channels are comprehensively considered. Narrow resonances are obtained
in each spin-parity channel for the fully-charm and -bottom systems. Moreover,
most of them seems to be compact multiquarks whose wave-functions are dominated
by either hidden-color baryon-meson or diquark-diquark-antiquark structure, or
by the coupling between them.
| [
{
"created": "Mon, 23 May 2022 18:01:08 GMT",
"version": "v1"
}
] | 2022-07-20 | [
[
"Yang",
"Gang",
""
],
[
"Ping",
"Jialun",
""
],
[
"Segovia",
"Jorge",
""
]
] | The fully-charm and -bottom pentaquarks, \emph{i.e.} $cccc\bar{c}$ and $bbbb\bar{b}$, with spin-parity quantum numbers $J^P=\frac{1}{2}^-$, $\frac{3}{2}^-$ and $\frac{5}{2}^-$, are investigated within a Lattice-QCD inspired quark model, which has already successfully described the recently announced fully-charm tetraquark candidate $X(6900)$, and has also predicted several other fully-heavy tetraquarks. A powerful computational technique, based on the Gaussian expansion method combined with a complex-scaling range approach, is employed to predict, and distinguish, bound, resonance and scattering states of the mentioned five-body system. Both baryon-meson and diquark-diquark-antiquark configurations, along with all of their possible color channels are comprehensively considered. Narrow resonances are obtained in each spin-parity channel for the fully-charm and -bottom systems. Moreover, most of them seems to be compact multiquarks whose wave-functions are dominated by either hidden-color baryon-meson or diquark-diquark-antiquark structure, or by the coupling between them. |
hep-ph/0506259 | Dominik Stockinger | J. Haestier, D. St\"ockinger, G. Weiglein, S. Heinemeyer | Two-loop contributions to electroweak precision observables in the MSSM | Talk given by D.S. at the 2005 International Linear Collider Workshop
- Stanford, USA. 6 pages, 5 figures, misprint corrected | null | null | IPPP/05/34, DCPT/05/68 | hep-ph | null | The evaluation of the two-loop MSSM-contributions to the electroweak
precision observables M_W and s_w^eff at order(alpha_t^2), order(alpha_t
alpha_b), order(alpha_b^2) is presented. These contributions enter via
Delta(rho), and it is explained in detail how one can retain the true,
non-vanishing value of the MSSM Higgs boson mass M_h in spite of using the
gauge-less limit in the calculation. The numerical results can be sizeable, in
particular for strong squark mixing. By comparing the results in the on-shell
and DR-bar renormalization schemes, the remaining theoretical uncertainty is
found to be small.
| [
{
"created": "Fri, 24 Jun 2005 20:01:34 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jul 2005 17:02:17 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Haestier",
"J.",
""
],
[
"Stöckinger",
"D.",
""
],
[
"Weiglein",
"G.",
""
],
[
"Heinemeyer",
"S.",
""
]
] | The evaluation of the two-loop MSSM-contributions to the electroweak precision observables M_W and s_w^eff at order(alpha_t^2), order(alpha_t alpha_b), order(alpha_b^2) is presented. These contributions enter via Delta(rho), and it is explained in detail how one can retain the true, non-vanishing value of the MSSM Higgs boson mass M_h in spite of using the gauge-less limit in the calculation. The numerical results can be sizeable, in particular for strong squark mixing. By comparing the results in the on-shell and DR-bar renormalization schemes, the remaining theoretical uncertainty is found to be small. |
hep-ph/0211043 | Greg Landsberg | Greg Landsberg | Black Holes at Future Colliders and Beyond - a Review | Plenary talk at the SUSY 2002 Conference, DESY, Hamburg, June 17-23,
2002. 14 pages, 4 figures | null | null | null | hep-ph hep-ex | null | As was suggested about a year ago, one of the most dramatic consequences of
low-scale (~1 TeV) quantum gravity is copious production of mini black holes at
future accelerators and in ultra-high-energy cosmic ray collisions. Hawking
radiation of these black holes is constrained mainly to our (3+1)-dimensional
world and results in rich phenomenology. With the original idea having been
cited over a hundred times since its appearence, we review the current status
of astrophysical observations of black holes and selected topics in the mini
black hole phenomenology, such as production rates at colliders and in cosmic
rays, Hawking radiation as a sensitive probe of the dimensionality of extra
space, as well as an exciting possibility of finding new physics in the decays
of black holes.
| [
{
"created": "Tue, 5 Nov 2002 20:31:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Landsberg",
"Greg",
""
]
] | As was suggested about a year ago, one of the most dramatic consequences of low-scale (~1 TeV) quantum gravity is copious production of mini black holes at future accelerators and in ultra-high-energy cosmic ray collisions. Hawking radiation of these black holes is constrained mainly to our (3+1)-dimensional world and results in rich phenomenology. With the original idea having been cited over a hundred times since its appearence, we review the current status of astrophysical observations of black holes and selected topics in the mini black hole phenomenology, such as production rates at colliders and in cosmic rays, Hawking radiation as a sensitive probe of the dimensionality of extra space, as well as an exciting possibility of finding new physics in the decays of black holes. |
hep-ph/0108184 | Dr. Otto C. W. Kong | Otto C.W. Kong (Nat'l Central U, Taiwan) | Neutrino Masses and $\mu \to e \gamma$ in the Generic Supersymmetric
Standard Model | 1+3 pages latex with ws-p8-50x6-00.cls (included); talk at SUSY'01 | null | 10.1142/9789812778192_0038 | NCU-HEP-k001 | hep-ph | null | We summarized our report on neutrino masses and $\mu \to e \gamma$ in the
generic supersymmetric standard model, emphasizing on the much overlooked
scalar masses contributions from R-parity violation.
| [
{
"created": "Thu, 23 Aug 2001 06:36:32 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Kong",
"Otto C. W.",
"",
"Nat'l Central U, Taiwan"
]
] | We summarized our report on neutrino masses and $\mu \to e \gamma$ in the generic supersymmetric standard model, emphasizing on the much overlooked scalar masses contributions from R-parity violation. |
1508.03143 | Jean Cleymans | J. Cleymans, M. D. Azmi | Large Transverse Momenta and Tsallis Thermodynamics | 4 pages, 2 figures, conference SQM2015 | null | 10.1088/1742-6596/668/1/012050 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The charged particle transverse momentum ($p_T$) spectra measured by the
ATLAS and CMS collaborations in proton - proton collisions at sqrt(s) = 0.9 and
7 TeV have been studied using Tsallis thermodynamics. A thermodynamically
consistent form of the Tsallis distribution is used for fitting the transverse
momentum spectra at mid-rapidity. It is found that the fits based on the
proposed distribution provide an excellent description over 14 orders of
magnitude with $p_T$ values up to 200 GeV/c.
| [
{
"created": "Thu, 13 Aug 2015 08:42:16 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Cleymans",
"J.",
""
],
[
"Azmi",
"M. D.",
""
]
] | The charged particle transverse momentum ($p_T$) spectra measured by the ATLAS and CMS collaborations in proton - proton collisions at sqrt(s) = 0.9 and 7 TeV have been studied using Tsallis thermodynamics. A thermodynamically consistent form of the Tsallis distribution is used for fitting the transverse momentum spectra at mid-rapidity. It is found that the fits based on the proposed distribution provide an excellent description over 14 orders of magnitude with $p_T$ values up to 200 GeV/c. |
hep-ph/0201164 | R. Sekhar Chivukula | R. Sekhar Chivukula and Hong-Jian He | Unitarity of Deconstructed Five-Dimensional Yang-Mills Theory | 11 pages, 1 eps figure | Phys.Lett. B532 (2002) 121-128 | null | BUHEP-02-02 and UTHEP-02-26 | hep-ph hep-th | null | The low-energy properties of a compactified five-dimensional gauge theory can
be reproduced in a four-dimensional theory with a replicated gauge group and an
appropriate gauge symmetry breaking pattern. The lightest vector bosons in
these "deconstructed" or "remodeled" theories have masses and couplings
approximately equal to those of the Kaluza-Klein tower of massive vector states
present in a compactified higher-dimensional gauge theory. We analyze the
unitarity of low-energy scattering of the massive vector bosons in a
deconstructed theory, and examine the relationship between the scale of
unitarity violation and the scale of the underlying chiral symmetry breaking
dynamics which breaks the replicated gauge groups. As in the case of
compactified five-dimensional gauge theories, low-energy unitarity is ensured
through an interlacing cancellation among contributions from the tower of
massive vector bosons. We show that the behavior of these scattering amplitudes
is manifest without such intricate cancellations in the scattering of the
would-be Goldstone bosons of the deconstructed theory. Unlike compactified
five-dimensional gauge theories, the amplitude for longitudinal vector boson
scattering in deconstructed theories does grow with energy, though this effect
is suppressed by 1/(N+1), with N+1 being the number of replicated gauge groups.
| [
{
"created": "Thu, 17 Jan 2002 21:04:02 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jan 2002 20:03:14 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"He",
"Hong-Jian",
""
]
] | The low-energy properties of a compactified five-dimensional gauge theory can be reproduced in a four-dimensional theory with a replicated gauge group and an appropriate gauge symmetry breaking pattern. The lightest vector bosons in these "deconstructed" or "remodeled" theories have masses and couplings approximately equal to those of the Kaluza-Klein tower of massive vector states present in a compactified higher-dimensional gauge theory. We analyze the unitarity of low-energy scattering of the massive vector bosons in a deconstructed theory, and examine the relationship between the scale of unitarity violation and the scale of the underlying chiral symmetry breaking dynamics which breaks the replicated gauge groups. As in the case of compactified five-dimensional gauge theories, low-energy unitarity is ensured through an interlacing cancellation among contributions from the tower of massive vector bosons. We show that the behavior of these scattering amplitudes is manifest without such intricate cancellations in the scattering of the would-be Goldstone bosons of the deconstructed theory. Unlike compactified five-dimensional gauge theories, the amplitude for longitudinal vector boson scattering in deconstructed theories does grow with energy, though this effect is suppressed by 1/(N+1), with N+1 being the number of replicated gauge groups. |
1812.08293 | Andrei Angelescu | Andrei Angelescu, Peisi Huang | Multistep Strongly First Order Phase Transitions from New Fermions at
the TeV Scale | 29 pages, 7 figures, 3 tables; v2: references added, matches
published version | Phys. Rev. D 99, 055023 (2019) | 10.1103/PhysRevD.99.055023 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In spite of the vast literature on the subject of first order Electroweak
Phase Transitions (EWPTs), which can provide the necessary conditions for
generating the Baryon Asymmetry in the Universe, fermion-induced EWPTs still
remain a rather uncharted territory. In this paper, we consider a simple
fermionic extension of the Standard Model involving one $SU(2)_L$ doublet and
two $SU(2)_L$ singlet Vector-Like Leptons, strongly coupled to the Higgs boson
and with masses close to the TeV scale. We show how such a simple scenario can
give rise to a non-trivial thermal history of the Universe, involving strongly
first order multistep phase transitions occurring at temperatures close to the
electroweak scale. Finally, we investigate the distinct Gravitational Wave (GW)
signatures of these phase transitions at future space--based GW detectors, such
as LISA, DECIGO, and BBO, and briefly discuss the possible LHC signatures of
the Vector-Like Leptons.
| [
{
"created": "Thu, 20 Dec 2018 00:21:08 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2019 09:27:24 GMT",
"version": "v2"
}
] | 2019-04-03 | [
[
"Angelescu",
"Andrei",
""
],
[
"Huang",
"Peisi",
""
]
] | In spite of the vast literature on the subject of first order Electroweak Phase Transitions (EWPTs), which can provide the necessary conditions for generating the Baryon Asymmetry in the Universe, fermion-induced EWPTs still remain a rather uncharted territory. In this paper, we consider a simple fermionic extension of the Standard Model involving one $SU(2)_L$ doublet and two $SU(2)_L$ singlet Vector-Like Leptons, strongly coupled to the Higgs boson and with masses close to the TeV scale. We show how such a simple scenario can give rise to a non-trivial thermal history of the Universe, involving strongly first order multistep phase transitions occurring at temperatures close to the electroweak scale. Finally, we investigate the distinct Gravitational Wave (GW) signatures of these phase transitions at future space--based GW detectors, such as LISA, DECIGO, and BBO, and briefly discuss the possible LHC signatures of the Vector-Like Leptons. |
1303.0872 | Kyoungchul Kong | Thomas Flacke, Kyoungchul Kong, Seong Chan Park | Phenomenology of Universal Extra Dimensions with Bulk-Masses and
Brane-Localized Terms | 32 pages, 12 figures | null | 10.1007/JHEP05(2013)111 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general model with universal extra dimensions in the presence of
the bulk fermion masses and boundary localized kinetic terms, which are
generically allowed by symmetries of five dimensional gauge theory. We provide
a comprehensive analysis for a general UED model, including Kaluza-Klein mass
spectra, their interactions with the SM particles, and constraints from LHC,
electroweak tests, and dark matter experiments. Finally we show current bounds
on the size of allowed universal bulk mass and universal brane-localized terms.
| [
{
"created": "Mon, 4 Mar 2013 21:43:00 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Flacke",
"Thomas",
""
],
[
"Kong",
"Kyoungchul",
""
],
[
"Park",
"Seong Chan",
""
]
] | We present a general model with universal extra dimensions in the presence of the bulk fermion masses and boundary localized kinetic terms, which are generically allowed by symmetries of five dimensional gauge theory. We provide a comprehensive analysis for a general UED model, including Kaluza-Klein mass spectra, their interactions with the SM particles, and constraints from LHC, electroweak tests, and dark matter experiments. Finally we show current bounds on the size of allowed universal bulk mass and universal brane-localized terms. |
1106.4523 | Hiroyuki Kamano | H. Kamano, S. X. Nakamura, T.-S. H. Lee, T. Sato | Unitary coupled-channels model for three-mesons decays of heavy mesons | 32 pages, 10 figures. Version to appear in PRD | Phys. Rev. D 84, 114019 (2011) | 10.1103/PhysRevD.84.114019 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A unitary coupled-channels model is presented for investigating the decays of
heavy mesons and excited meson states into three light pseudoscalar mesons. The
model accounts for the three-mesons final state interactions in the decay
processes, as required by both the three-body and two-body unitarity
conditions. In the absence of the Z-diagram mechanisms that are necessary
consequences of the three-body unitarity, our decay amplitudes are reduced to a
form similar to those used in the so-called isobar-model analysis. We apply our
coupled-channels model to the three-pions decays of a1(1260), pi2(1670),
pi2(2100), and D0 mesons, and show that the Z-diagram mechanisms can contribute
to the calculated Dalitz plot distributions by as much as 30% in magnitudes in
the regions where f0(600), rho(770), and f2(1270) dominate the distributions.
Also, by fitting to the same Dalitz plot distributions, we demonstrate that the
decay amplitudes obtained with the unitary model and the isobar model can be
rather different, particularly in the phase that plays a crucial role in
extracting the CKM CP-violating phase from the data of B meson decays. Our
results indicate that the commonly used isobar model analysis must be extended
to account for the final state interactions required by the three-body
unitarity to reanalyze the three-mesons decays of heavy mesons, thereby
exploring hybrid or exotic mesons, and signatures of physics beyond the
standard model.
| [
{
"created": "Wed, 22 Jun 2011 18:24:23 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Dec 2011 00:49:01 GMT",
"version": "v2"
}
] | 2011-12-20 | [
[
"Kamano",
"H.",
""
],
[
"Nakamura",
"S. X.",
""
],
[
"Lee",
"T. -S. H.",
""
],
[
"Sato",
"T.",
""
]
] | A unitary coupled-channels model is presented for investigating the decays of heavy mesons and excited meson states into three light pseudoscalar mesons. The model accounts for the three-mesons final state interactions in the decay processes, as required by both the three-body and two-body unitarity conditions. In the absence of the Z-diagram mechanisms that are necessary consequences of the three-body unitarity, our decay amplitudes are reduced to a form similar to those used in the so-called isobar-model analysis. We apply our coupled-channels model to the three-pions decays of a1(1260), pi2(1670), pi2(2100), and D0 mesons, and show that the Z-diagram mechanisms can contribute to the calculated Dalitz plot distributions by as much as 30% in magnitudes in the regions where f0(600), rho(770), and f2(1270) dominate the distributions. Also, by fitting to the same Dalitz plot distributions, we demonstrate that the decay amplitudes obtained with the unitary model and the isobar model can be rather different, particularly in the phase that plays a crucial role in extracting the CKM CP-violating phase from the data of B meson decays. Our results indicate that the commonly used isobar model analysis must be extended to account for the final state interactions required by the three-body unitarity to reanalyze the three-mesons decays of heavy mesons, thereby exploring hybrid or exotic mesons, and signatures of physics beyond the standard model. |
1610.09392 | Nathaniel Craig | Nathaniel Craig, Patrick Draper, Kyoungchul Kong, Yvonne Ng, and
Daniel Whiteson | The unexplored landscape of two-body resonances | 9 pages, 2 figures, 4 tables | null | null | PITT-PACC-1610 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a strategy for searching for theoretically-unanticipated new
physics which avoids a large trials factor by focusing on experimental
strengths. Searches for resonances decaying into pairs of visible particles are
experimentally very powerful due to the localized mass peaks and have a rich
history of discovery. Yet, due to a focus on subsets of theoretically-motivated
models, the landscape of such resonances is far from thoroughly explored. We
survey the existing set of searches, identify untapped experimental
opportunities and discuss the theoretical constraints on models which would
generate such resonances.
| [
{
"created": "Fri, 28 Oct 2016 20:23:31 GMT",
"version": "v1"
}
] | 2016-11-01 | [
[
"Craig",
"Nathaniel",
""
],
[
"Draper",
"Patrick",
""
],
[
"Kong",
"Kyoungchul",
""
],
[
"Ng",
"Yvonne",
""
],
[
"Whiteson",
"Daniel",
""
]
] | We propose a strategy for searching for theoretically-unanticipated new physics which avoids a large trials factor by focusing on experimental strengths. Searches for resonances decaying into pairs of visible particles are experimentally very powerful due to the localized mass peaks and have a rich history of discovery. Yet, due to a focus on subsets of theoretically-motivated models, the landscape of such resonances is far from thoroughly explored. We survey the existing set of searches, identify untapped experimental opportunities and discuss the theoretical constraints on models which would generate such resonances. |
2207.05598 | Jialun Ping | Xiaohuang Hu, Jialun Ping | Analysis of $\Omega(2012)$ as a molecule in the chiral quark model | 10 pages, 5 figures. arXiv admin note: text overlap with
arXiv:2109.09972 | null | 10.1103/PhysRevD.106.054028 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the updated information on $\Omega(2012)$ by the Belle
Collaboration, we conduct a study of all possible $S$-wave pentaquark systems
with quark contents $sssq\bar{q},q=u,d$ in a chiral quark model with the help
of Gaussian expansion method. Channel coupling is also considered. The
real-scaling method (stabilization method) is employed to identify and check
the bound states and the genuine resonances. In addition, the decay widths of
all resonances are given. The results show that $\Omega(2012)$ can be
interpreted as a $\Xi^*K$ molecular state with quantum number of
$IJ^P=0(\frac{3}{2})^-$. Other resonances are obtained: $\Xi^* K^*$ with
$IJ^P=0(\frac{1}{2})^-$ and$0(\frac{3}{2})^-$, $\Omega\pi$ with
$IJ^P=1(\frac{3}{2})^-$. These pentaquark states is expected to be further
verified in future experiments.
| [
{
"created": "Tue, 12 Jul 2022 15:15:03 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Hu",
"Xiaohuang",
""
],
[
"Ping",
"Jialun",
""
]
] | Inspired by the updated information on $\Omega(2012)$ by the Belle Collaboration, we conduct a study of all possible $S$-wave pentaquark systems with quark contents $sssq\bar{q},q=u,d$ in a chiral quark model with the help of Gaussian expansion method. Channel coupling is also considered. The real-scaling method (stabilization method) is employed to identify and check the bound states and the genuine resonances. In addition, the decay widths of all resonances are given. The results show that $\Omega(2012)$ can be interpreted as a $\Xi^*K$ molecular state with quantum number of $IJ^P=0(\frac{3}{2})^-$. Other resonances are obtained: $\Xi^* K^*$ with $IJ^P=0(\frac{1}{2})^-$ and$0(\frac{3}{2})^-$, $\Omega\pi$ with $IJ^P=1(\frac{3}{2})^-$. These pentaquark states is expected to be further verified in future experiments. |
hep-ph/9704435 | null | A.G.Oganesian | Vacuum expectations of the high dimensional operator and their
contribution in Bjorken and Ellis-Jaffe sum rules | 14 pages, LaTeX, 1 figure can be received from author by request | Phys.Atom.Nucl.61:1359-1366,1998; Yad.Fiz.61:1464-1472,1998 | null | null | hep-ph | null | The method of estimation of the unknown high-dimensional vacuum averages is
offered. This method is based on the idea of self-consistence of the
factorization hypothesis. So it appears possible to evaluate all vacuum
averages of dimension 7 and also get some estimations for vacuum averages of
dimension 10. Obtained results are used to calculate high dimensional operator
contribution to Bjorken and Ellis-Jaffe sum rules.
| [
{
"created": "Tue, 29 Apr 1997 15:52:06 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Oganesian",
"A. G.",
""
]
] | The method of estimation of the unknown high-dimensional vacuum averages is offered. This method is based on the idea of self-consistence of the factorization hypothesis. So it appears possible to evaluate all vacuum averages of dimension 7 and also get some estimations for vacuum averages of dimension 10. Obtained results are used to calculate high dimensional operator contribution to Bjorken and Ellis-Jaffe sum rules. |
hep-ph/9710260 | Manuel A. Valle | M. A. Valle Basagoiti | Damping rate of plasmons and photons in a degenerate nonrelativistic
plasma | 9 pages, 2 figures | Phys.Rev.D57:7618,1998 | 10.1103/PhysRevD.57.7618 | EHU-FT/9707 | hep-ph | null | A calculation is presented of the plasmon and photon damping rates in a dense
nonrelativistic plasma at zero temperature, following the resummation program
of Braaten-Pisarski. At small soft momentum $k$, the damping is dominated by $3
\to 2$ scattering processes corresponding to double longitudinal Landau
damping. The dampings are proportional to $(\alpha/v_{F})^{3/2} k^2/m$, where
$v_{F}$ is the Fermi velocity.
| [
{
"created": "Tue, 7 Oct 1997 07:38:57 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Basagoiti",
"M. A. Valle",
""
]
] | A calculation is presented of the plasmon and photon damping rates in a dense nonrelativistic plasma at zero temperature, following the resummation program of Braaten-Pisarski. At small soft momentum $k$, the damping is dominated by $3 \to 2$ scattering processes corresponding to double longitudinal Landau damping. The dampings are proportional to $(\alpha/v_{F})^{3/2} k^2/m$, where $v_{F}$ is the Fermi velocity. |
1503.08255 | Nobuhito Maru | Nobuhito Maru | Higgs Mass in D-Term triggered Dynamical SUSY Breaking | 7 pages, 3 eps files, contribution to Sakata Memorial KMI Workshop on
"Origin of Mass and Strong Coupling Gauge Theories (SCGT15)", 3-6 March 2015,
Nagoya University | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a new mechanism of D-term dynamical supersymmetry breaking in the
context of Dirac gaugino scenario. The existence of a nontrivial solution of
the gap equation for D-term is shown. It is also shown that an observed 126 GeV
Higgs mass is realized by tree level D-term effects in a broad range of
parameters.
| [
{
"created": "Sat, 28 Mar 2015 01:29:44 GMT",
"version": "v1"
}
] | 2015-03-31 | [
[
"Maru",
"Nobuhito",
""
]
] | We discuss a new mechanism of D-term dynamical supersymmetry breaking in the context of Dirac gaugino scenario. The existence of a nontrivial solution of the gap equation for D-term is shown. It is also shown that an observed 126 GeV Higgs mass is realized by tree level D-term effects in a broad range of parameters. |
hep-ph/0210205 | Keith OIive | J. Ellis (CERN), T. Falk, K.A. Olive, Y. Santoso (TPI, U of Minnesota) | Exploration of the MSSM with Non-Universal Higgs Masses | 92 pages LaTeX, 32 eps figures, final version, some changes to
figures pertaining to the b to s gamma constraint | Nucl.Phys.B652:259-347,2003 | 10.1016/S0550-3213(02)01144-6 | CERN-TH/2002-238,UMN-TH-2113/02,TPI-MINN-02/42 | hep-ph astro-ph hep-ex | null | We explore the parameter space of the minimal supersymmetric extension of the
Standard Model (MSSM), allowing the soft supersymmetry-breaking masses of the
Higgs multiplets, m_{1,2}, to be non-universal (NUHM). Compared with the
constrained MSSM (CMSSM) in which m_{1,2} are required to be equal to the soft
supersymmetry-breaking masses m_0 of the squark and slepton masses, the Higgs
mixing parameter mu and the pseudoscalar Higgs mass m_A, which are calculated
in the CMSSM, are free in the NUHM model. We incorporate accelerator and dark
matter constraints in determining allowed regions of the (mu, m_A), (mu, M_2)
and (m_{1/2}, m_0) planes for selected choices of the other NUHM parameters. In
the examples studied, we find that the LSP mass cannot be reduced far below its
limit in the CMSSM, whereas m_A may be as small as allowed by LEP for large tan
\beta. We present in Appendices details of the calculations of
neutralino-slepton, chargino-slepton and neutralino-sneutrino coannihilation
needed in our exploration of the NUHM.
| [
{
"created": "Tue, 15 Oct 2002 00:11:52 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Dec 2002 00:49:12 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Ellis",
"J.",
"",
"CERN"
],
[
"Falk",
"T.",
"",
"TPI, U of Minnesota"
],
[
"Olive",
"K. A.",
"",
"TPI, U of Minnesota"
],
[
"Santoso",
"Y.",
"",
"TPI, U of Minnesota"
]
] | We explore the parameter space of the minimal supersymmetric extension of the Standard Model (MSSM), allowing the soft supersymmetry-breaking masses of the Higgs multiplets, m_{1,2}, to be non-universal (NUHM). Compared with the constrained MSSM (CMSSM) in which m_{1,2} are required to be equal to the soft supersymmetry-breaking masses m_0 of the squark and slepton masses, the Higgs mixing parameter mu and the pseudoscalar Higgs mass m_A, which are calculated in the CMSSM, are free in the NUHM model. We incorporate accelerator and dark matter constraints in determining allowed regions of the (mu, m_A), (mu, M_2) and (m_{1/2}, m_0) planes for selected choices of the other NUHM parameters. In the examples studied, we find that the LSP mass cannot be reduced far below its limit in the CMSSM, whereas m_A may be as small as allowed by LEP for large tan \beta. We present in Appendices details of the calculations of neutralino-slepton, chargino-slepton and neutralino-sneutrino coannihilation needed in our exploration of the NUHM. |
2109.11662 | Mohammadreza Zakeri | Mohammadreza Zakeri, Yu-Feng Zhou | Constraining Time Dependent Dark Matter Signals from the Sun | 30 pages, 19 figures | JCAP 04 (2022) 04, 026 | 10.1088/1475-7516/2022/04/026 | null | hep-ph astro-ph.HE astro-ph.SR | http://creativecommons.org/licenses/by-sa/4.0/ | Dark matter (DM) particles captured by the Sun can produce high energy
electrons outside the Sun through annihilating into meta-stable mediators. The
corresponding cosmic-ray electron signals observed by the space-based
experiments will be time dependent due to the orbital motion of the space-based
detectors. The shape of this time dependence is predictable given the orbital
information of the detectors. Since the high-energy CR electron (with energy
E>100 GeV) fluxes are expected to be constant in time, non-observation of such
time variation can be used to place upper limits on the DM annihilation cross
section. We analyze the time dependence of dark matter cosmic-ray signals in
three space-based experiments: AMS-02, DAMPE and CALET. Under the assumption
that no time dependent signal is observed, we derive the 95% C.L. exclusion
limits on the signal strength from the current data. We map our limits onto the
parameter space of the dark photon model and find that the constraints are
comparable with that derived from the supernova SN1987A.
| [
{
"created": "Thu, 23 Sep 2021 21:58:37 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Nov 2021 18:03:44 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Apr 2022 15:45:17 GMT",
"version": "v3"
}
] | 2022-04-27 | [
[
"Zakeri",
"Mohammadreza",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | Dark matter (DM) particles captured by the Sun can produce high energy electrons outside the Sun through annihilating into meta-stable mediators. The corresponding cosmic-ray electron signals observed by the space-based experiments will be time dependent due to the orbital motion of the space-based detectors. The shape of this time dependence is predictable given the orbital information of the detectors. Since the high-energy CR electron (with energy E>100 GeV) fluxes are expected to be constant in time, non-observation of such time variation can be used to place upper limits on the DM annihilation cross section. We analyze the time dependence of dark matter cosmic-ray signals in three space-based experiments: AMS-02, DAMPE and CALET. Under the assumption that no time dependent signal is observed, we derive the 95% C.L. exclusion limits on the signal strength from the current data. We map our limits onto the parameter space of the dark photon model and find that the constraints are comparable with that derived from the supernova SN1987A. |
0704.0075 | Xiang Liu | Chong Chen, Xiao-Lin Chen, Xiang Liu, Wei-Zhen Deng and Shi-Lin Zhu | Strong decays of charmed baryons | 13 pages, 9 figures, 9 tables. Some descriptions changed. Published
version in PRD | Phys.Rev.D75:094017,2007 | 10.1103/PhysRevD.75.094017 | null | hep-ph hep-ex nucl-ex | null | There has been important experimental progress in the sector of heavy baryons
in the past several years. We study the strong decays of the S-wave, P-wave,
D-wave and radially excited charmed baryons using the $^3P_0$ model. After
comparing the calculated decay pattern and total width with the available data,
we discuss the possible internal structure and quantum numbers of those charmed
baryons observed recently.
| [
{
"created": "Sun, 1 Apr 2007 09:45:55 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Apr 2007 12:24:08 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Apr 2007 16:20:10 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Chen",
"Chong",
""
],
[
"Chen",
"Xiao-Lin",
""
],
[
"Liu",
"Xiang",
""
],
[
"Deng",
"Wei-Zhen",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | There has been important experimental progress in the sector of heavy baryons in the past several years. We study the strong decays of the S-wave, P-wave, D-wave and radially excited charmed baryons using the $^3P_0$ model. After comparing the calculated decay pattern and total width with the available data, we discuss the possible internal structure and quantum numbers of those charmed baryons observed recently. |
1204.4940 | Sylvain Fichet | Sylvain Fichet | Quantified naturalness from Bayesian statistics | 28 pages, 1 figure, v3: to be published in PRD | null | 10.1103/PhysRevD.86.125029 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a formulation of naturalness made in the framework of Bayesian
statistics, which unravels the conceptual problems related to previous
approaches. Among other things, the relative interpretation of the measure of
naturalness turns out to be unambiguously established by Jeffreys' scale. Also,
the usual sensitivity formulation (so-called Barbieri-Giudice measure) appears
to be embedded in our formulation under an extended form. We derive the general
sensitivity formula applicable to an arbitrary number of observables. Several
consequences and developments are further discussed. As a final illustration,
we work out the map of combined fine-tuning associated to the gauge hierarchy
problem and neutralino dark matter in a classic supersymmetric model.
| [
{
"created": "Sun, 22 Apr 2012 21:32:37 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jun 2012 18:30:47 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Nov 2012 21:23:48 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Fichet",
"Sylvain",
""
]
] | We present a formulation of naturalness made in the framework of Bayesian statistics, which unravels the conceptual problems related to previous approaches. Among other things, the relative interpretation of the measure of naturalness turns out to be unambiguously established by Jeffreys' scale. Also, the usual sensitivity formulation (so-called Barbieri-Giudice measure) appears to be embedded in our formulation under an extended form. We derive the general sensitivity formula applicable to an arbitrary number of observables. Several consequences and developments are further discussed. As a final illustration, we work out the map of combined fine-tuning associated to the gauge hierarchy problem and neutralino dark matter in a classic supersymmetric model. |
hep-ph/0509027 | Magno Machado | V.P. Goncalves, M.V.T. Machado, W.K. Sauter | The QCD Pomeron in Ultraperipheral Heavy Ion Collisions: V. Double
Vector Meson Production in the BFKL Approach | 10 pages, 1 figure. Version to be published in the European Physical
Journal C | Eur.Phys.J.C46:219-224,2006 | 10.1140/epjc/s2006-02473-2 | null | hep-ph | null | In this work the double vector meson production in ultraperipheral heavy ion
collisions is investigated within the BFKL approach. The integrated cross
sections and event rates for the processes AA --> V1 V2 AA (V_i = rho, omega,
phi, J/Psi, Upsilon) are computed and theoretical estimates for scattering on
both light and heavy nuclei are given for energies of RHIC and LHC.
| [
{
"created": "Mon, 5 Sep 2005 02:29:13 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2005 15:30:03 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Goncalves",
"V. P.",
""
],
[
"Machado",
"M. V. T.",
""
],
[
"Sauter",
"W. K.",
""
]
] | In this work the double vector meson production in ultraperipheral heavy ion collisions is investigated within the BFKL approach. The integrated cross sections and event rates for the processes AA --> V1 V2 AA (V_i = rho, omega, phi, J/Psi, Upsilon) are computed and theoretical estimates for scattering on both light and heavy nuclei are given for energies of RHIC and LHC. |
0804.1736 | Larry McLerran | Larry McLerran | The Color Glass Condensate and Glasma | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These two lectures concern the Color Glass Condensate and the Glasma. These
are forms of matter which might be studied in high energy hadronic collisions.
The Color Glass Condensate is high energy density gluonic matter. It
constitutes the part of a hadron wavefunction important for high energy
processes. The Glasma is matter produced from the collision of two high energy
hadrons. Both types of matter are associated with coherent fields. The Color
Glass Condensate is static and related to a hadron wavefunction where the
glasma is transient and evolves quickly after a collision. I present the
properties of such matter, and some aspects of what is known of their
properties.
| [
{
"created": "Thu, 10 Apr 2008 15:40:54 GMT",
"version": "v1"
}
] | 2008-04-11 | [
[
"McLerran",
"Larry",
""
]
] | These two lectures concern the Color Glass Condensate and the Glasma. These are forms of matter which might be studied in high energy hadronic collisions. The Color Glass Condensate is high energy density gluonic matter. It constitutes the part of a hadron wavefunction important for high energy processes. The Glasma is matter produced from the collision of two high energy hadrons. Both types of matter are associated with coherent fields. The Color Glass Condensate is static and related to a hadron wavefunction where the glasma is transient and evolves quickly after a collision. I present the properties of such matter, and some aspects of what is known of their properties. |
hep-ph/9610382 | Robert Harris | Kingman Cheung (University of Texas) and Robert M. Harris (Fermilab) | Discovering New Interactions at Colliders | 10 pages, 13 Figures, 5 tables, LaTex, macros epsf.sty,
snowtimes.sty, and snow2e.cls. Summary of New Interactions subgroup of New
Phenomena group at Snowass. To appear in the proceedings of DPF/DPB Summer
Study on New Directions for High Energy Physics, Snowmass, Colorado, June
25-July 12, 1996. Postscript file of paper, as it will appear in snowmass
proceedings, available at
http://www-cdf.fnal.gov/physics/conf96/cdf3913_snow_new_interaction.ps | ECONFC960625:NEW155,1996 | null | UTEXAS-HEP-96-20, Fermilab-Conf-96/362 | hep-ph hep-ex | null | We summarize results of the 1996 Snowmass workshop on future prospects for
discovering dynamical electroweak symmetry breaking, compositeness, and
anomalous couplings of quarks at colliders. We present the mass reach of the
Tevatron to a color singlet or octet technirho, and to a topgluon or topcolor
Z' from topcolor assisted technicolor. We explore the sensitivity of the
Tevatron, LHC, NLC, and VLHC to contact interactions and excited fermions.
Finally we investigate the possibility of seeing anomalous couplings of quarks
at the Tevatron and LHC.
| [
{
"created": "Wed, 16 Oct 1996 19:07:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cheung",
"Kingman",
"",
"University of Texas"
],
[
"Harris",
"Robert M.",
"",
"Fermilab"
]
] | We summarize results of the 1996 Snowmass workshop on future prospects for discovering dynamical electroweak symmetry breaking, compositeness, and anomalous couplings of quarks at colliders. We present the mass reach of the Tevatron to a color singlet or octet technirho, and to a topgluon or topcolor Z' from topcolor assisted technicolor. We explore the sensitivity of the Tevatron, LHC, NLC, and VLHC to contact interactions and excited fermions. Finally we investigate the possibility of seeing anomalous couplings of quarks at the Tevatron and LHC. |
1106.5533 | Boris Blok | B. Blok (Technion), Yu. Dokshitser (LPTHE, University Paris 6), L.
Frankfurt (Tel Aviv University), M. Strikman (Penn State University) | pQCD Physics of multiparton interactions | 16 pages,4 figures Improved presentation; list of references
reworked; qualitative estimate of the magnitude of different contributions in
the beck-to- back region corrected | null | 10.1140/epjc/s10052-012-1963-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study production of two pairs of jets in %hard hadron--hadron collisions
in view of extracting contribution of {\em double hard interactions} of three
and four partons ($3\to4$, $4\to4$). Such interactions, in spite of being power
suppressed at the level of the total cross section, become comparable with the
standard hard collisions of two partons, $2\to4$, in the {\em back-to-back
kinematics} when the transverse momentum imbalances of two pairing jets are
relatively small.
We express differential and total cross sections for two-dijet production in
double parton collisions through the generalized two-parton distributions,
$_2$GPDs \cite{BDFS1}, that contain large-distance two-parton correlations of
non-perturbative origin as well as small-distance correlations due to parton
evolution. We find that these large- and small-distance correlations
participate in different manner in 4-jet production, and treat them in the
leading logarithmic approximation of pQCD that resums collinear logarithms in
all orders.
A special emphasis is given to $3\to4$ double hard interaction processes that
occur as an interplay between large- and short-distance parton correlations and
were not taken into consideration by approaches inspired by the parton model
picture. We demonstrate that the $3\to4$ mechanism, being of the same order in
$\as$ as the $4\to4$ process, turns out to be {\em geometrically enhanced}
compared to the latter and should contribute significantly to 4-jet production.
The framework developed here takes into systematic consideration perturbative
$Q^2$ evolution of $_2$GPDs. It can be used as a basis for future analysis of
NLO corrections to multi-parton interactions (MPI) at LHC and Tevatron
colliders, in particular for improving evaluation of QCD backgrounds to new
physics searches.
| [
{
"created": "Mon, 27 Jun 2011 22:13:24 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jan 2012 14:21:32 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Blok",
"B.",
"",
"Technion"
],
[
"Dokshitser",
"Yu.",
"",
"LPTHE, University Paris 6"
],
[
"Frankfurt",
"L.",
"",
"Tel Aviv University"
],
[
"Strikman",
"M.",
"",
"Penn State University"
]
] | We study production of two pairs of jets in %hard hadron--hadron collisions in view of extracting contribution of {\em double hard interactions} of three and four partons ($3\to4$, $4\to4$). Such interactions, in spite of being power suppressed at the level of the total cross section, become comparable with the standard hard collisions of two partons, $2\to4$, in the {\em back-to-back kinematics} when the transverse momentum imbalances of two pairing jets are relatively small. We express differential and total cross sections for two-dijet production in double parton collisions through the generalized two-parton distributions, $_2$GPDs \cite{BDFS1}, that contain large-distance two-parton correlations of non-perturbative origin as well as small-distance correlations due to parton evolution. We find that these large- and small-distance correlations participate in different manner in 4-jet production, and treat them in the leading logarithmic approximation of pQCD that resums collinear logarithms in all orders. A special emphasis is given to $3\to4$ double hard interaction processes that occur as an interplay between large- and short-distance parton correlations and were not taken into consideration by approaches inspired by the parton model picture. We demonstrate that the $3\to4$ mechanism, being of the same order in $\as$ as the $4\to4$ process, turns out to be {\em geometrically enhanced} compared to the latter and should contribute significantly to 4-jet production. The framework developed here takes into systematic consideration perturbative $Q^2$ evolution of $_2$GPDs. It can be used as a basis for future analysis of NLO corrections to multi-parton interactions (MPI) at LHC and Tevatron colliders, in particular for improving evaluation of QCD backgrounds to new physics searches. |
hep-ph/9812262 | Gerald Cleaver | Gerald B. Cleaver | Quark Masses and Flat Directions in String Models | 10 pages. Standard Latex | null | null | CTP-TAMU-40/98, UPR-795-T | hep-ph hep-th | null | I discuss a method for producing a quasi-realistic inter-generational quark
mass hierarchy in string models. This approach involves non-Abelian singlet
states developing intermediate scale vacuum expectation values. I summarize
recent investigations into string model realization of this. Talk presented at
QCD98, Paris, France, 1-6 June 1998.
| [
{
"created": "Sun, 6 Dec 1998 06:48:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cleaver",
"Gerald B.",
""
]
] | I discuss a method for producing a quasi-realistic inter-generational quark mass hierarchy in string models. This approach involves non-Abelian singlet states developing intermediate scale vacuum expectation values. I summarize recent investigations into string model realization of this. Talk presented at QCD98, Paris, France, 1-6 June 1998. |
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