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Photoproduction of Vector Mesons at Large Transfer: At forward angles, the cross-sections of photoproduction of vector mesons
($\rho$, $\omega$, and $\phi$) are well accounted for by the exchange of the
Pomeron at high energies, while contributions of $t$ channel exchange of
Reggeons are significant at low energies. At... | hep-ph |
Analysis of the decay constants of the heavy pseudoscalar mesons with
QCD sum rules: In this article, we recalculate the contributions of all vacuum condensates
up to dimension-6, in particular the one-loop corrections to the quark
condensates $\alpha_s<\bar{q}q>$ and partial one-loop corrections to the
four-quark co... | hep-ph |
Threshold behavior of Feynman diagrams: the master two-loop propagator: An asymptotic expansion of the two-loop two-point ``master'' diagram with two
masses $m$ and $M$, on the mass shell $Q^2=M^2$, is presented. The treatment of
the non-analytical terms arising in the expansion around the branching point is
discussed.... | hep-ph |
Virtual Corrections to the NLO Splitting Functions for Monte Carlo: the
non-singlet case: Construction of a QCD cascade at the NLO level requires recalculation of the
splitting functions in a different manner [1]. We describe the calculation of
some of the virtual contributions to the non-singlet splitting function. ... | hep-ph |
Induced top Yukawa coupling and suppressed Higgs mass parameters: In the scenarios with heavy top squarks, mass parameters of the Higgs field
must be fine-tuned due to a large logarithmic correction to the soft scalar
mass. We consider a new possibility that the top Yukawa coupling is small above
TeV scale. The large t... | hep-ph |
DUNE potential as a New Physics probe: Neutrino experiments, in the next years, aim to determine with precision all
the six parameters of the three-neutrino standard paradigm. The complete
success of the experimental program is, nevertheless, attached to the
non-existence (or at least smallness) of Non-Standard Interac... | hep-ph |
Partonic structure of the virtual photon: Interactions of virtual photons are analyzed in terms of their parton
distribution functions. It is shown that the concept of parton distribution
functions is phenomenologically very useful even for highly virtual photonds
involved in hard collisions. The role of the longitudin... | hep-ph |
Inelastic dark matter nucleus scattering: Direct detection experiments aim at the detection of dark matter in the form
of weakly interacting massive particles (WIMPs) by searching for signals from
elastic dark matter nucleus scattering. Additionally, inelastic scattering in
which the nucleus is excited is expected from... | hep-ph |
Hard spectator-scattering in B -> pi pi decays at NNLO: We compute the 1-loop (NNLO) corrections to hard spectator-scattering in
tree-dominated hadronic B decays. Depending on the values of hadronic input
parameters the corrections are shown to have a significant impact on the B ->
pi pi branching fractions. | hep-ph |
Dilaton Stabilisation in $D$-term Inflation: Dilaton stabilisation is usually considered to pose a serious obstacle to
successful $D$-term inflation in superstring theories. We argue that the
physics of gaugino condensation is likely to be modified during the
inflationary phase in such a way as to enhance the gaugino c... | hep-ph |
Bell's Inequality and $τ$-Physics at LEP: In this talk given at the TAU92 Workshop, Columbus, OH, Sept. 92, we
summarize results presented in more detail in a recent paper by S. Abel, M.
Dittmar and the author where we gave a general proof that Bell's inequality can
not be tested at a collider experiment. In particular... | hep-ph |
Neutrino induced meson productions in forward limit: We study neutrino-induced meson productions off the nucleon in the forward
limit by applying the PCAC hypothesis to our dynamical coupled-channels (DCC)
model. The DCC model reasonably describes pi N, gamma N -> pi N, eta N, K
Lambda, K Sigma data in the resonance re... | hep-ph |
The linear BESS model and the double Higgs-strahlung production: In this paper we evaluate, in the context of the linear BESS model the
cross-section for the double Higgs-strahlung process. We find that, within the
bounds given by the actual experimental data, significant deviations with
respect to the SM may arise. In... | hep-ph |
Density spikes near black holes in self-interacting dark matter halos
and indirect detection constraints: Self-interacting dark matter (SIDM) naturally gives rise to a cored
isothermal density profile, which is favored in observations of many dwarf
galaxies. The dark matter distribution in the presence of a central b... | hep-ph |
Weak Radiative Hyperon Decays in Chiral Perturbation Theory: The parity-conserving $a$ and parity-violating $b$ amplitudes for weak
radiative hyperon decay are studied using chiral perturbation theory. The
imaginary parts of $a$ and $b$ are computed using unitarity. The real part of
$b$ is dominated by a one-loop infra... | hep-ph |
Report of the Topical Group on Cosmic Probes of Dark Matter for Snowmass
2021: Cosmological and astrophysical observations currently provide the only
robust, positive evidence for dark matter. Cosmic probes of dark matter, which
seek to determine the fundamental properties of dark matter through
observations of the c... | hep-ph |
First exotic hadron with open heavy flavor: $cs\bar u\bar d$ tetraquark: The LHCb Collaboration has reported resonant activity in the channel $D^+
K^-$, identifying two components: $X_0(2900)$ with $J^P = 0^+$ at $2866 {\pm}
7$ MeV, $\Gamma_0=57{\pm} 13$ MeV and $X_1(2900)$ with $J^P = 1^-$ at $2904
{\pm} 7$ MeV, $\Gam... | hep-ph |
Investigating $R_D$ and $R_{D^*}$ anomalies in a Left-Right model with
an Inverse Seesaw: We investigate $R_D$ and $R_{D^*}$ anomalies in a low scale left-right
symmetric model based on $SU(3)_C\times SU(2)_L\times SU(2)_R\times
U(1)_{B-L}\times Z_2$ with a simplified Higgs sector consisting of only one
bidoublet and... | hep-ph |
Phase Transition to RS: Cool, not Supercool: Motivated by the warped conifold compactification, we model the infrared (IR)
dynamics of confining gauge theories in a Randall-Sundrum (RS)-like setup by
modifying the stabilizing Goldberger-Wise (GW) potential so that it becomes
large (in magnitude) in the IR and back-reac... | hep-ph |
Phenomenology of the BFKL pomeron and Unitarity Corrections at low x: The low $x$ limit of deep inelastic electron proton scattering is considered
using methods of perturbative QCD. In the first part we investigate the
phenomenological consequences of the resummation of leading logarithms in $1/x$
given by the BFKL pom... | hep-ph |
Probing neutrino magnetic moment and unparticle interactions with
Borexino: We discuss the limits on the neutrino magnetic moment and hypothetical
interactions with a hidden unparticle sector, coming from the first neutrino
data release of the Borexino experiment. The observed spectrum in Borexino
depends weakly on t... | hep-ph |
Chiral Phase Transition in QCD and Vector Manifestation: Spontaneous chiral symmetry breaking is one of the most important features in
low-energy QCD. The chiral symmetry is expected to be restored at very high
temperature and/or density. Accompanied by the chiral phase transition,
properties of hadrons will be changed... | hep-ph |
Probing a new decay of vector-like top partner mediated by heavy
Majorana neutrino via single production: Models beyond the Standard Model have been proposed to simultaneously solve
the problems of naturalness and neutrino mass, in which heavy Majorana
neutrinos and vector-like top partners are usually predicted. A n... | hep-ph |
Effects of lepton number violating interactions on $t \bar t$ production
at NLC: We discuss the effects of lepton number violating interactions namely,
R-parity violation and leptoquarks on top quark pair production at the upcoming
$e^+ e^-$ linear colliders. Effects of SU(2) singlet, doublet and triplet
leptoquark i... | hep-ph |
Scaling law for the $Υ(4S) \to B \bar B$ and $ψ(3770) \to D
\bar D$ decay constants from effective sum rules: Sum rules for exclusive production of heavy meson pairs in $e^+e^-$
annihilation are used to evaluate the $\Upsilon(4S) \to B \bar B$ and
$\psi(3770) \to D \bar D$ decay widths. Infinitely heavy quark limit i... | hep-ph |
Branching ratios of $B_s\to (K^+K^-,K^0\bar{K}^0)$ and $B_d\to π^+
π^- and determination of \boldmath{$γ(φ_3)$: We explored various cases for the branching ratios (BRs) of $B_s\to K^+K^-$,
$B_s\to K^0\bar{K}^0$ and $B_d\to \pi^+ \pi^-$ decays. We study the possibility
of determining $\gamma $ by using the following t... | hep-ph |
Top quark asymmetry and dijet resonances: CDF recently reported an anomaly in the $m_{jj}$ distribution of dijet events
produced in association with a $W$ boson. If this anomaly is associated with a
new flavor conserving vector resonance, $V$, one might have expected to observe
effects in the analogous $m_{jj}$ distrib... | hep-ph |
NLO QCD Predictions for associated t-tbar-h production in Hadronic
Collisions: We present the next-to-leading-order (NLO) QCD corrections to the inclusive
total cross section for the production of a Higgs boson in association with a
top anti-top quark pair within the Standard Model at the Tevatron and the LHC. | hep-ph |
Calculation of the scattering amplitudes: General equations for the calculation of amplitudes are presented. As an
illustration of application of proposed formulae we calculate electron-electron
scattering amplitudes. | hep-ph |
Manifestaion of SUSY in B decays: SUSY effects on various flavor changing neutral current processes are
discussed in the minimal supergravity model and the SU(5) grand unified theory
with right-handed neutrino supermultiplets. In particular, in the latter case
the neutrino Yukawa coupling constants can be a source of t... | hep-ph |
Pseudoscalar--meson decuplet--baryon coupling constants in light cone
QCD: Taking into account the $SU(3)_f$ breaking effects, the strong coupling
constants of the $\pi$, $K$ and $\eta$ mesons with decuplet baryons are
calculated within light cone QCD sum rules method. It is shown that all
coupling constants, even in... | hep-ph |
The QCD phase structure at finite temperature and density: We discuss the phase structure of QCD for $N_f=2$ and $N_f=2+1$ dynamical
quark flavours at finite temperature and baryon chemical potential. It emerges
dynamically from the underlying fundamental interactions between quarks and
gluons in our work. To this end,... | hep-ph |
Gauge Dependence of Four-Fermion QED Green Function and Atom-Like Bound
State Calculations: We derive a relation between four-fermion QED Green functions of different
covariant gauges which defines the gauge dependence completely. We use the
derived gauge dependence to check the gauge invariance of atom-like bound st... | hep-ph |
Ernest Henley and the shape of baryons: Calculations of pion-baryon couplings, baryon quadrupole and octupole
moments, baryon spin and orbital angular momentum done in collaboration with
Ernest Henley are reviewed. A common theme of this work is the shape of
baryons. Also, a personal account of my work with Ernest Henl... | hep-ph |
Braaten-Pisarski Action, Disoriented Chiral Condensate, and Chiral
Symmetry Non-Restoration: The QCD effective action at high T shows a manifest global chiral symmetry.
And calculations show that the order parameter \psibarpsi vanishes above T_c.
It has been popular to refer to this T_c as chiral symmetry restoration... | hep-ph |
Can an invisible Higgs boson be seen via diffraction at the LHC?: We study the possibility of observing an `invisible' Higgs boson in central
exclusive diffractive production at the LHC. We evaluate the cross section
using, as a simple example, the Standard Model with a heavy fourth generation,
where the invisible deca... | hep-ph |
MLAnalysis: An open-source program for high energy physics analyses: We present a python-based program for phenomenological investigations in
particle physics using machine learning algorithms, called \verb"MLAnalysis".
The program is able to convert LHE and LHCO files generated by
\verb"MadGraph5_aMC@NLO" into data se... | hep-ph |
On next to soft corrections to Drell-Yan and Higgs Boson productions: We present a framework that resums threshold enhanced large logarithms to all
orders in perturbation theory for the production of a pair of leptons in
Drell-Yan process and of Higgs boson in gluon fusion as well as in bottom quark
annihilation. We re... | hep-ph |
Threshold factorization of the Drell-Yan process at next-to-leading
power: We present a factorization theorem valid near the kinematic threshold
$z=Q^2/\hat{s}\to 1$ of the partonic Drell-Yan process $q\bar q\to\gamma^*+X$
for general subleading powers in the $(1-z)$ expansion. We then consider the
specific case of n... | hep-ph |
A Step Toward Model Comparison: Connecting Electroweak-Scale Observables
to BSM through EFT and Bayesian Statistics: Recognizing the potential of effective field theories to posit multiple BSM
scenarios in similar footing, with a possibility to compare them, we inspect
the effects of 11 single scalar-multiplet extens... | hep-ph |
Phenomenological study of the anisotropic quark matter in the 2-flavor
Nambu-Jona-Lasinio model: With the two flavor Nambu-Jona-Lasinio (NJL) model we carry out a
phenomenological study on the chiral phase structure, mesonic properties and
transport properties in a momentum-space anisotropic quark matter. To calculat... | hep-ph |
Double-parton scattering effects in double charm production within gluon
fragmentation scenario: We discuss charm $D^0 D^0$ meson-meson pair production in the forward
rapidity region related to the LHCb experimental studies at $\sqrt{s}$ = 7 TeV.
We consider double-parton scattering mechanisms of double $c \bar c$ pr... | hep-ph |
DGLAP evolution for DIS diffraction production of high masses: In this paper we develop the DGLAP evolution for the system of produced
gluons in the process of diffractive production in DIS, directly from the
evolution equation in Color Glass Condensate approach. We are able to describe
the available experimental data ... | hep-ph |
Instanton induced transverse single spin asymmetry for $π^0$
production in $pp$-scattering: We calculate the production cross-section and the transverse single-spin
asymmetry for pion in $p^{\uparrow}+p\to \pi^0 + X$. Our computation is based
on existence of the instanton induced effective quark-gluon and
quark-gluon... | hep-ph |
MicroBooNE and the $ν_e$ Interpretation of the MiniBooNE Low-Energy
Excess: A new generation of neutrino experiments is testing the $4.8\sigma$ anomalous
excess of electron-like events observed in MiniBooNE. This is of huge
importance for particle physics, astrophysics, and cosmology, not only because
of the potentia... | hep-ph |
Elliptic flow from color-dipole orientation in pp and pA collisions: For ultrarelativistic proton-proton and proton-nucleus collisions, we perform
an exploratory study of the contribution to the elliptic flow $v_2$ coming from
the orientation of the momentum of the produced particles with respect to the
reaction plane.... | hep-ph |
Polarization in B->VV Decays: Factorizable amplitudes in B decays to light vector meson pairs give a
longitudinal polarization satisfying 1- f_L =O(1/m_b^2). This remains formally
true when non-factorizable graphs are included in QCD factorization, and is
numerically realized in B->Rho Rho. In \Delta S=1 decays a QCD p... | hep-ph |
Four-Quark Mesons: The features of a model interpreting the light scalar mesons as
diquark-antidiquark bound states and the consequences of its natural extension
to include heavy quarks are briefly reviewed. | hep-ph |
Hadrons on the worldline, holography, and Wilson flow: Holographic principles have impacted the way we look at strong coupling
phenomena in quantum chromodynamics, strongly interacting extensions of the
standard model, and {condensed-matter} physics. In real world settings,
however, we still lack understanding of why a... | hep-ph |
Reconciling sterile neutrinos with big bang nucleosynthesis: We re-examine the big bang nucleosynthesis (BBN) bounds on the mixing of
neutrinos with sterile species. These bounds depend on the assumption that the
relic neutrino asymmetry $L_{\nu}$ is very small. We show that for $L_{\nu}$
large enough (greater than abo... | hep-ph |
Discovery potential of the next-to-minimal supergravity-motivated model: Applying a likelihood analysis to the next-to-minimal supergravity-motivated
model, we identify parameter space regions preferred by present experimental
limits from collider, astrophysical, and low energy measurements. We then show
that favored r... | hep-ph |
Amplitude Factorization in the Electroweak Standard Model: We lay out the basis of factorization at the amplitude level for processes
involving the entire Standard Model. The factorization appears in a generalized
eikonal approximation in which we expand around a quasi-soft limit for massive
gauge bosons, fermions, and... | hep-ph |
An experiment to detect gravity at sub-mm scale with high-Q mechanical
oscillators: Silicon double paddle oscillators are well suited for the detection of weak
forces because of their high Q factor (about 10^5 at room temperature). We
describe an experiment aimed at the detection of gravitational forces between
masse... | hep-ph |
Vector-like quarks with non-renormalizable interactions: We study the impact of the leading non-renormalizable terms in the effective
field theory that describes general extensions of the Standard Model with
vector-like quarks. Dropping the usual assumption of renormalizability has
several phenomenological consequences... | hep-ph |
Sfermion masses in the supersymmetric economical 3-3-1 model: Sfermion masses and eigenstates in the supersymmetric economical 3-3-1 model
are studied. By lepton number conservation, the exotic squarks and
superpartners of ordinary quarks are decoupled. Due to the fact that in the
3-3-1 models, one generation of quarks... | hep-ph |
Weak interaction corrections to hadronic top quark pair production:
contributions from quark-gluon and $b \bar b$ induced reactions: As an addendum to our previous evaluation of the weak-interaction corrections
to hadronic top-quark pair production we determine the leading weak-interaction
contributions due to the su... | hep-ph |
Low Energy Theorems of Hidden Local Symmetries: We prove to all orders of the loop expansion the low energy theorems of
hidden local symmetries in four-dimensional nonlinear sigma models based on the
coset space $G/H$, with $G$ and $H$ being arbitrary compact groups. Although
the models are non-renormalizable, the proo... | hep-ph |
Neutrino quantum states and spin light in matter: On the basis of the exact solutions of the modified Dirac equation for a
massive neutrino moving in matter we develop the quantum theory of the spin
light of neutrino ($SL\nu$). The expression for the emitted photon energy is
derived as a function of the density of matt... | hep-ph |
Implication of the B -> rho rho data on the B -> pi pi puzzle: We point out that the B -> rho rho data have seriously constrained the
possibility of resolving the B -> pi pi puzzle from the large observed B^0 ->
pi^0 pi^0 branching ratio in the available theoretical approaches. The
next-to-leading-order (NLO) contribut... | hep-ph |
Self-consistent statistical error analysis of $ππ$ scattering: We analyze the conditions under which a statistical error analysis can be
carried out in the case of $\pi\pi$ scattering, namely the normality of
residuals in the conventional $\chi^2$-fit method. Here we check that the
current and benchmarking analyses onl... | hep-ph |
Quantum corrections to leptogenesis from the gradient expansion: Using the closed-time-path formalism we quantify gradient corrections to the
kinetic equations for leptogenesis, that are neglected in the standard
Boltzmann approach. In particular we show that an additional CP-violating
source term arises, which is non-... | hep-ph |
Matter-gravity interaction in a multiply warped braneworld,: The role of a bulk graviton in predicting the signature of extra dimensions
through collider-based experiments is explored in the context of a multiply
warped spacetime. In particular it is shown that in a doubly warped braneworld
model, the presence of the s... | hep-ph |
Transversity Distribution Functions in the Valon Model: By using the valon model, we calculate the Transverse Momentum Distribution
functions, TMDs, inside the Nucleon. TMDs indicate the probability to find
partons with spin aligned (anti- aligned) to the transversely polarized
nucleon. The results are in good agreemen... | hep-ph |
Do W_L and H form a p-wave bound state?: We examine the possibility of bound state formation in the W_L H --> W_L H
channel. The dynamical calculation using the N/D method indicates that when the
interactions among the Goldstone and Higgs bosons become sufficiently strong, a
p-wave state [I^G(J^P)=1^-(1^+)] may emerge. | hep-ph |
Gribov's Equation for the Green Function of Light Quarks: Gribov's scenario of supercritical charges in QCD is investigated. We perform
a numerical study of the corresponding equation for the Green function of light
quarks. This is done in an approximation which neglects all pion contributions.
Different types of solut... | hep-ph |
Supersymmetric D-term Inflation, Reheating and Affleck-Dine Baryogenesis: The phenomenology of supersymmetric models of inflation, where the
inflationary vacuum energy is dominated by D-terms of a U(1), is investigated.
Particular attention is paid to the questions of how to arrange for sufficient
e-folds of inflation ... | hep-ph |
Covariant Description of Flavor Conversion in the LHC Era: A simple covariant formalism to describe flavor and CP violation in the
left-handed quark sector in a model independent way is provided. The
introduction of a covariant basis, which makes the standard model approximate
symmetry structure manifest, leads to a ph... | hep-ph |
Advantages of exclusive γγproduction to probe high mass
systems: We recall that the exclusive production of high mass objects via \gamma\gamma
fusion at the LHC is not strongly suppressed in comparison with inclusive
\gamma\gamma fusion. Therefore it may be promising to study new objects
produced by the \gamma\gamma ... | hep-ph |
Top quark anomalous tensor couplings in the two-Higgs-doublet models: We compute the one loop right and left anomalous tensor couplings ($g_R$ and
$g_L$, respectively) for the top quark, in the aligned two-Higgs-doublet model.
They are the magnetic-like couplings in the most general parameterization of
the $tbW$ vertex... | hep-ph |
Neutralino Dark Matter with Inert Higgsinos and Singlinos: We discuss neutralino dark matter arising from supersymmetric models with
extra inert Higgsinos and singlinos, where inert means that their scalar
partners do not get vacuum expectation values. As an example, we consider the
extended neutralino sector of the E$... | hep-ph |
Lambda Oscillations and the Conservation Laws: Lowe, Bassalleck, Burkhardt, Rusek, Stephenson, and Goldman assert, under the
assumption of decays at fixed space-time points, that Kaon induced Lambda
oscillations disappear. We find, under the same assumption, that energy
conservation and momentum conservation also disap... | hep-ph |
Vacuum energy and the cosmological constant: The accelerating expansion of the Universe points to a small positive value
for the cosmological constant or vacuum energy density. We discuss recent ideas
that the cosmological constant plus LHC results might hint at critical
phenomena near the Planck scale. | hep-ph |
A description of the ratio between electric and magnetic proton form
factors by using space-like, time-like data and dispersion relations: We use the available information on the ratio between the electric and
magnetic proton form factors coming from recently published space-like data and
from the few available time-... | hep-ph |
Nonuniversality of indirect CP asymmetries in $D \to ππ, KK$ decays: We point out that, if the direct CP asymmetries in the $D \to \pi^+ \pi^-$
and $D \to K^+ K^-$ decays are unequal, the indirect CP asymmetries as measured
in these modes are necessarily unequal. This nonuniversality of indirect CP
asymmetries can be s... | hep-ph |
Inclusive electromagnetic decays of the heavy quarkonium at next to
leading log accuracy: We show that perturbation theory may give reasonable numbers for the decays
of the bottomonium and charmonium ground states to $e^+e^-$ and to
$\gamma\gamma$. To reach this conclusion it is important to perform the
resummation o... | hep-ph |
Inverse Problem of Cosmic-Ray Electron/Positron from Dark Matter: We discuss the possibility of solving the inverse problem of the cosmic-ray
electron/positron from decaying/annihilating dark matter, and show simple
analytic formulae to reconstruct the source spectrum of the electron/positron
from the observed flux. We... | hep-ph |
Higgs Physics at the LHC: Some Theory Aspects: In these lecture notes we review some prospect for the upcoming LHC
experiments in view of the exploration of the Standard Model (SM) or its
minimal Supersymmetric extension (MSSM). We focus on some theoretical aspects
concerning the Higgs sector of the two models. We give... | hep-ph |
Hadronic Higgs boson decay at order $α_s^4$ and $α_s^5$: We compute corrections to the decay of the Standard Model Higgs boson to
hadrons, to the fourth order in the strong coupling constant $\alpha_s$. We use
an effective theory in which the Higgs boson couples directly to bottom quarks
and to gluons, via top quark--m... | hep-ph |
Hadronic Light-by-light Scattering Effect on Muon g-2: The hadronic light-by-light scattering contribution to muon $g-2$ is examined
using low energy effective theories of QCD, the Nambu-Jona-Lasinio model and
hidden local chiral symmetry, as guides. Our result is $- 36 \times 10^{-11}$
with an uncertainty of $\pm 16 \... | hep-ph |
CP violation in bilinear R-parity violation and its consequences for the
early universe: Supersymmetric models with bilinear R-parity violation (BRpV) provide a
framework for neutrino masses and mixing angles to explain neutrino oscillation
data. We consider CP violation within the new physical phases in BRpV and
dis... | hep-ph |
Vector gauge boson radiation from compact binary systems in a gauged
$L_μ-L_τ$ scenario: The orbital period of a compact binary system decays mainly due to quadrupole
gravitational radiation, which agrees with the observation to within one
percent. Other types of radiation such as ultralight scalar or pseudoscalar
ra... | hep-ph |
Relic Abundance of Neutralinos in Heterotic String Theory: Weak Coupling
vs. Strong Coupling: The relic abundance of stable neutralinos is investigated in $E_8 \times
E_8'$ heterotic string theory when supersymmetry is spontaneously broken by
hidden-sector gaugino condensates. In the weak coupling regime, very large
... | hep-ph |
The Hunting of the MR Model: We consider experimental signatures of the standard model's minimal
supersymmetric extension with a continuous $U(1)_R$ symmetry (MR model). We
focus on the ability of existing and planned electron-positron colliders to
probe this model and to distinguish it from both the standard model and... | hep-ph |
Heavy neutral 2HDM Higgs Boson Pair Production at CLIC Energies: In this work, the neutral Higgs boson pair production is analyzed at Compact
Linear Collider (CLIC) to be operating at center of mass energies
$\sqrt{s}$=1400 GeV (stage 2) and $\sqrt{s}$=3000 GeV (stage 3). The Higgs
bosons to be searched for are neutral... | hep-ph |
CP violation and limits on New Physics including recent $B_s$
measurements: We analyse present constraints on the SM parameter space and derive, in a
model independent way, various bounds on New Physics contributions to
$B_d^0$--$\bar B_d^0$ and $B_s^0$--$\bar B_s^0$ mixings. Our analyses include
information on a lar... | hep-ph |
The Fundamental Constants in Physics: We discuss the fundamental constants of physics in the Standard Model and
possible changes of these constants on the cosmological time scale. The Grand
Unification of the strong, electromagnetic and weak interactions implies
relations between the time variation of the finestructure... | hep-ph |
Asymmetric Dark Matter via Spontaneous Co-Genesis: We investigate, in the context of asymmetric dark matter (DM), a new
mechanism of spontaneous co-genesis of linked DM and baryon asymmetries,
explaining the observed relation between the baryon and DM densities,
Omega_DM/Omega_B ~ 5. The co-genesis mechanism requires a... | hep-ph |
Connection between diphoton and triboson channels in new physics
searches: Diphoton channel provides a clean signature in searches for new physics. In
this paper, we discuss a connection between the diphoton channel
($\gamma\gamma$) and triboson channels ($Z\gamma\gamma$, $ZZ\gamma$,
$WW\gamma$) imposed by the $SU(2)... | hep-ph |
Universality of Nonperturbative Effects in Event Shapes: Nonperturbative effects in event shape distributions can be characterized by
shape functions derived in the eikonal approximation or, equivalently, from
soft-collinear effective theory. The use of energy flow operators and the boost
invariance of the Wilson lines... | hep-ph |
Cornering pseudoscalar-mediated dark matter with the LHC and cosmology: Models in which dark matter particles communicate with the visible sector
through a pseudoscalar mediator are well-motivated both from a theoretical and
from a phenomenological standpoint. With direct detection bounds being
typically subleading in ... | hep-ph |
Exclusive meson pair production in gamma* gamma scattering at small
momentum transfer: We study the exclusive production of pi pi and rho pi in hard gamma* gamma
scattering in the forward kinematical region where the virtuality of one photon
provides us with a hard scale in the process. The newly introduced concept o... | hep-ph |
CP violation in the semileptonic top decay in two-Higgs doublet model: CP violation in semileptonic top-quark decay is investigated by exactly using
one charged- and three neutral-Higgs bosons obtained by solving the Higgs mass
matrix in two-Higgs doublet model. The CP-violating up-down asymmetry of
leptons from $W$ bo... | hep-ph |
Coherent photoproduction of low-$p_{T}$ charmonium in peripheral heavy
ion collisions within the color dipole model: We calculate the centrality dependence for coherent photoproduction of very
low-$p_{T}$ $J/\psi$ at Relativistic Heavy Ion Collider (RHIC) and Large Hadron
Collider (LHC) energies within the impact par... | hep-ph |
Magnetic Inelastic Dark Matter: Iodine is distinguished from other elements used in dark matter direct
detection experiments both by its large mass as well as its large magnetic
moment. Inelastic dark matter utilizes the large mass of iodine to allay
tensions between the DAMA annual modulation signature and the null re... | hep-ph |
From R_AA via correlations to jets - the long road to tomography: The main motivation to investigate hard probes in heavy ion collisions is to
do tomography, i.e. to infer medium properties from the in-medium modification
of hard processes. Yet while the suppression of high P_T hadrons has been
measured for some time, ... | hep-ph |
Bayesian Selection of sign(mu) within mSUGRA in Global Fits Including
WMAP5 Results: We study the properties of the constrained minimal supersymmetric standard
model (mSUGRA) by performing fits to updated indirect data, including the relic
density of dark matter inferred from WMAP5. In order to find the extent to
whi... | hep-ph |
(Light) Stop Signs: Stop squarks with a mass just above the top's and which decay to a nearly
massless LSP are difficult to probe because of the large SM di-top background.
Here we discuss search strategies which could be used to set more stringent
bounds in this difficult region. In particular, we note that both the r... | hep-ph |
Corrections to the ${\bf SU(3)\times SU(3)}$ Gell-Mann-Oakes-Renner
relation and chiral couplings $L^r_8$ and $H^r_2$: Next to leading order corrections to the $SU(3) \times SU(3)$
Gell-Mann-Oakes-Renner relation (GMOR) are obtained using weighted QCD Finite
Energy Sum Rules (FESR) involving the pseudoscalar current ... | hep-ph |
Dark Matters in Gauged B-3L_i Model: We study a dark matter model with local B-3L_i symmetry that is known as
anomaly free and requires a single right-handed neutrino. Here we have two dark
matter candidates; that is, fermionic or bosonic one. We focus on analyzing
each of the case within the light mass region, which i... | hep-ph |
Resolved Photon Processes: We review the present level of knowledge of the hadronic structure of the
photon, as revealed in interactions involving quarks and gluons ``in" the
photon. The concept of photon structure functions is introduced in the
description of deep--inelastic $e \gamma$ scattering, and existing
paramet... | hep-ph |
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