title: Diquark-antidiquark states with hidden or open charm

abstract:
  Some features and predictions of a recently proposed model based on
diquark-antidiquark bound states are illustrated. Its ability in accomodating
newly discovered charmed resonances around 4 GeV is discussed.


title: Kinematics in Vector Boson Fusion

abstract:
  The vector boson fusion process leads to two forward/backward jets (tag jets)
and the produced state, a Higgs boson in this case, moving slowly in the p-p
C.M. frame at the LHC. For the case of Higgs decaying to W+W (W*) with Higgs
mass below 180 GeV, the W bosons have low momentum in the Higgs C.M. For the
case of W leptonic decays, this fact allows for an approximate reconstruction
of the two final state neutrinos. In turn, those solutions then provide
additional kinematic cuts against background.


title:
Probing the Fundamental Symmetries of the Early Universe: The Low Energy
  Frontier

abstract:
  Searching for the fundamental symmetries that characterize the particle
physics of the early universe lies at the forefront of particle physics,
nuclear physics, and cosmology. In this talk, I review low energy probes of
these symmetries and discuss what they may teach us about what lies beyond the
fundamental symmetries of the Standard Model.


title:
Perturbative vs Schwinger-propagator method for the calculation of
  amplitudes in a magnetic field

abstract:
  We consider the calculation of amplitudes for processes that take place in a
constant background magnetic field, first using the standard method for the
calculation of an amplitude in an external field, and second utilizing the
Schwinger propagator for charged particles in a magnetic field. We show that
there are processes for which the Schwinger propagator method does not yield
the total amplitude. We explain why the two methods yield equivalent results in
some cases and indicate when we can expect the equivalence to hold. We show
these results in fairly general terms and illustrate them with specific
examples as well.


title: On Goldstone bosons decoupling from high-lying hadrons

abstract:
  In this paper, we discuss a decoupling of the Goldstone bosons from highly
excited hadrons in relation to the restoration of chiral symmetry in such
hadrons. We use a generalised Nambu-Jona-Lasinio model with the interaction
between quarks in the form of an instantaneous Lorentz-vector confining
potential. This model is known to provide spontaneous breaking of chiral
symmetry in the vacuum via the standard selfenergy loops for valence quarks.
For highly excited hadrons, where the typical momentum of valence quarks is
large, the loop contributions represent only a small correction to the
chiral-invariant classical contributions and asymptotically vanish.
Consequently the chiral symmetry violating Lorentz-scalar dynamical mass of
quarks vanishes. Then the conservation of the axial vector current in the
chiral limit requires, via the Goldberger-Treiman relation, that the valence
quarks decouple from the Goldstone boson. As a consequence, the whole hadron
decouples from the Goldstone boson as well, which implies that its axial
constant also vanishes.


title:
Neutrino Dark Energy and Moduli Stabilization in a BPS Braneworld
  Scenario

abstract:
  A braneworld model for neutrino Dark Energy (DE) is presented. We consider a
five dimensional two-branes set up with a bulk scalar field motivated by
supergravity. Its low-energy effective theory is derived with a moduli space
approximation (MSA). The position of the two branes are parametrized by two
scalar degrees of freedom (moduli). After detuning the brane tensions a
classical potential for the moduli is generated. This potential is unstable for
dS branes and we suggest to consider as a stabilizing contribution the Casimir
energy of bulk fields. In particular we add a massive spinor (neutrino) field
in the bulk and then evaluate the Casimir contribution of the bulk neutrino
with the help of zeta function regularization techniques. We construct an
explicit form of the 4D neutrino mass as function of the two moduli. To recover
the correct DE scale for the moduli potential the usual cosmological constant
fine-tuning is necessary, but, once accepted, this model suggests a stronger
connection between DE and neutrino physics.


title:
MERADGEN 1.0: Monte Carlo generator for the simulation of radiative
  events in parity conserving doubly-polarized Moller scattering

abstract:
  The Monte Carlo generator MERADGEN 1.0 for the simulation of radiative events
in parity conserving doubly-polarized Moller scattering has been developed.
Analytical integration wherever it is possible provides rather fast and
accurate generation. Some numerical tests and histograms are presented.


title: Quantum decoherence and neutrino data

abstract:
  In this work we perform global fits of microscopic decoherence models of
neutrinos to all available current data, including LSND and KamLAND spectral
distortion results. In previous works on related issues the models used were
supposed to explain LSND results by means of quantum gravity induced
decoherence. However those models were purely phenomenological without any
underlying microscopic basis. It is one of the main purposes of this article to
use detailed microscopic decoherence models with complete positivity, to fit
the data.The decoherence in these models has contributions not only from
stochastic quantum gravity vacua operating as a medium, but also from
conventional uncertainties in the energy of the (anti)neutrino beam. All these
contributions lead to oscillation-length independent damping factors modulating
the oscillatory terms from which one obtains an excellent fit to all available
neutrino data, including LSND and Kamland spectral distortion.


title: A model of the effect of collisions on QCD plasma instabilities

abstract:
  We study the effect of including a BGK collisional kernel on the collective
modes of a QCD plasma which has a hard-particle distribution function which is
anisotropic in momentum space. We calculate dispersion relations for both the
stable and unstable modes and show that the addition of hard particle
collisions slows the rate of growth of QCD plasma unstable modes. We also show
that for any anisotropy there is an upper limit on the collisional frequency
beyond which no instabilities exist. Estimating a realistic value for the
collisional frequency for alpha_s ~ 0.2 - 0.4 we find that for the
large-anisotropy case which is relevant for the initial state of matter
generated by free streaming in heavy-ion collisions that the collisional
frequency is below this critical value.


title: A Variable Flavour Number Scheme for Heavy Quark Production at Small x

abstract:
  We define a new variable flavour number scheme for use in deep inelastic
scattering, motivated by the need to consistently implement high energy
resummations alongside a fixed order QCD expansion. We define the DIS(chi)
scheme at fixed order, and show how to obtain the small x coefficient functions
and heavy flavour matrix elements to leading order in the high energy
resummation. We then implement these results in a global fit at LO which
includes leading resummations with running coupling corrections. Finally, we
address the impact of the resummed results on predictions for the longitudinal
structure function. We find that they stabilise the behaviour of F_L at small
x. Overall, we find that resummations significantly improve the fit to
scattering data in the low x regime, although higher orders in the fixed order
expansion are needed to describe current structure function and related data
over the complete x range.


title: Markovian Monte Carlo solutions of the NLO QCD evolution equations

abstract:
  We present precision Monte Carlo calculations solving the QCD evolution
equations up to the next-to-leading-order (NLO) level. They employ forward
Markovian Monte Carlo (FMC) algorithms, which provide the rigorous solutions of
the QCD evolution equations. Appropriate Monte Carlo algorithms are described
in detail. They are implemented in the form of the Monte Carlo program EvolFMC,
which features the NLO kernels for the QCD evolution. The presented numerical
results agree with those from independent, non-MC, programs (QCDNum16,
APCheb33) at the level of 0.1%. In this way we have demonstrated the
feasibility of the precision MC calculations for the QCD evolution and provided
very useful numerical tests (benchmarks) for other, non-Markovian, MC
algorithms developed recently.


title: Matrix Elements of SU(6) Generators for Baryons at Arbitrary $N_c$

abstract:
  We present explicit formulas for the matrix elements of the SU(6) generators
for totally symmetric spin-flavor states, relevant for baryon spectroscopy in
large $N_c$ QCD. We rely on the interplay between two different methods to
calculate these matrix elements. As an outcome, general analytic formulas of
the corresponding SU(6) isoscalar factors are derived for arbitrary $N_c$.
These results can be used to study excited states of nonstrange and strange
baryons.


title:
Damping of supernova neutrino transitions in stochastic shock-wave
  density profiles

abstract:
  Supernova neutrino flavor transitions during the shock wave propagation are
known to encode relevant information not only about the matter density profile
but also about unknown neutrino properties, such as the mass hierarchy (normal
or inverted) and the mixing angle theta_13. While previous studies have
focussed on "deterministic" density profiles, we investigate the effect of
possible stochastic matter density fluctuations in the wake of supernova shock
waves. In particular, we study the impact of small-scale fluctuations on the
electron (anti)neutrino survival probability, and on the observable spectra of
inverse-beta-decay events in future water-Cherenkov detectors. We find that
such fluctuations, even with relatively small amplitudes, can have significant
damping effects on the flavor transition pattern, and can partly erase the
shock-wave imprint on the observable time spectra, especially for
sin^2(theta_13) > O(10^-3).


title: Simulation of QED Radiation in Particle decays using the YFS Formalism

abstract:
  In this paper we describe a program (SOPHTY) implementing QED corrections to
decays in the HERWIG++ event generator. In order to resum the dominant soft
emissions to all orders, the program is based on the YFS formalism. In
addition, universal large collinear logarithms are included and the approach
can be systematically extended to incorporate exact, process specific, higher
order corrections to decays. Due to the large number of possible decay modes
the program is designed to operate, as far as possible, independently of the
decay matrix elements.


title:
Phenomenological analysis connecting proton-proton and antiproton-proton
  elastic scattering

abstract:
  Based on the behavior of the elastic scattering data, we introduce an almost
model-independent parametrization for the imaginary part of the scattering
amplitude, with the energy and momentum transfer dependences inferred on
empirical basis and selected by rigorous theorems and bounds from axiomatic
quantum field theory. The corresponding real part is analytically evaluated by
means of dispersion relations, allowing connections between particle-particle
and particle-antiparticle scattering. Simultaneous fits to proton-proton and
antiproton-proton experimental data in the forward direction and also including
data beyond the forward direction, lead to a predictive formalism in both
energy and momentum transfer. We compare our extrapolations with predictions
from some popular models and discuss the applicability of the results in the
normalization of elastic rates that can be extracted from present and future
accelerator experiments (Tevatron, RHIC and LHC).


title: What can we learn from neutrino electron scattering?

abstract:
  Precision tests of the standard model are essential for constraining models
of new physics. Neutrino-electron elastic scattering offers a clean probe into
many electroweak effects that are complimentary to the more canonical
measurements done at collider facilities. Such reactions are rare, even as
compared with the already tiny cross-sections for neutrino-nucleon scattering,
and competitive precision measurements have historically been challenging to
obtain. Due to new existing and proposed high-flux neutrino sources, this is
about to change. We present a topical survey of precision measurements that can
be done with neutrino-electron scattering in light of these new developments.
Specifically, we consider four distinct neutrino sources: nuclear reactors,
neutrino factories, beta-beams, and conventional beams. For each source we
estimate the expected future precision of several representative observables,
including the weak mixing angle, neutrino magnetic moments, and potential
leptonic Z' couplings. We find that future neutrino-electron scattering
experiments should add non-trivially to our understanding of fundamental
physics.


title: All-orders resummation for diphoton production at hadron colliders

abstract:
  We present a QCD calculation of the transverse momentum distribution of
photon pairs produced at hadron colliders, including all-orders soft-gluon
resummation valid at next-to-next-to-leading logarithmic accuracy. We specify
the region of phase space in which the calculation is most reliable, compare
our results with data from the Fermilab Tevatron, and make predictions for the
Large Hadron Collider. The uncertainty of predictions for production of
diphotons from fragmentation of final-state quarks is examined.


title: Electroweak symmetry breaking and precision data

abstract:
  We study the impact of LEP2 constraints on the dimensionless coefficients of
the electroweak chiral Lagrangian on the precision observables using the
improved renormalization group equations. We find that the current uncertainty
in the triple and quartic gauge boson couplings can accommodate electroweak
symmetry breaking models with $S(\Lambda=1 \textrm{TeV}) > 0$.


title: Probing a Very Narrow $Z'$ Boson with CDF and D0 Data

abstract:
  The CDF and D0 data of nearly 475 $\text{pb}^{-1}$ in the dilepton channel is
used to probe a recent class of models, Stueckelberg extensions of the Standard
Model (StSM), which predict a $Z'$ boson whose mass is of topological origin
with a very narrow decay width. A Drell-Yan analysis for dilepton production
via this $Z'$ shows that the current data put constraints on the parameter
space of the StSM. With a total integrated luminosity of $8 $ $\text{fb}^{-1}$,
the very narrow $Z'$ can be discovered up to a mass of about 600 GeV. The StSM
$Z'$ will be very distinct since it can occur in the region where a
Randall-Sundrum graviton is excluded.


title: Two-body decays of Lambda_b

abstract:
  Two body non-leptonic decays:Lambda_b-->Lambda_c P(V) are investigated.
Baryon form factors of the heavy quark effective theory are employed. Form
factors for renormalization in full QCD are also considered. We find that
contributions of the non-factorizable terms are negligible in b-decays.
Comparison with calculations in other models shows that form factors for
renormalization in full QCD should be more relevant. The asymmetry parameters
are negative as in the charmed baryons cases. An experimental measure on the
form factors V1 and A1 is accentuated to test the validity of HQET.


title: Higher-Order threshold effects to inclusive processes in QCD

abstract:
  We present threshold enhanced QCD corrections to inclusive processes such as
Deep inelastic scattering, Drell-Yan process and Higgs productions through
gluon fusion and bottom quark annihilation processes using the resummed cross
sections. The resummed cross sections are derived using renormalisation group
invariance and mass factorisation theorem that these hard scattering cross
sections satisfy and Sudakov resummation of QCD amplitudes. We show how these
higher order threshold QCD corrections improve the theoretical predictions for
the Higgs production through gluon fusion at hadron colliders.


title: Extra-Dimensions and Dark Matter

abstract:
  In this paper we study the general scenario of an effective theory coming
from the compactification of a higher dimensional theory in a string inspired
setting. This leads to gauge coupling unification at an intermediate mass
scale. After having computed all the threshold corrections (due to Kaluza-Klein
modes) to the running of the couplings of the MSSM we embark in a detailed
phenomenological analysis of the model, based on the numerical package
DarkSUSY, to find constraints on the scenario from Dark Matter data. The mass
spectrum of the theory does not have tachyons. Moreover we find that the
neutralino is still the LSP with a relic density compatible with the most
recent experimental data. With respect to the standard mSUGRA scenario we find
that the neutralino is higgsino like in most of the parameter space. Our
modifications to the DarkSUSY package will be shortly available upon request.


title: Leptogenesis Below the Davidson-Ibarra Bound

abstract:
  The observed baryon asymmetry of the Universe is suitably created in thermal
leptogenesis through the out-of-equilibrium decay of $N_1$, the lightest of the
three heavy singlet neutral fermions which anchor the seesaw mechanism to
obtain small Majorana neutrino masses. However, this scenario suffers from the
incompatibility of a generic lower bound on the mass of $N_1$ and the upper
bound on the reheating temperature of the Universe after inflation. A modest
resolution of this conundrum is proposed.


title:
Deriving the Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner
  equation with classical and quantum source terms

abstract:
  We discuss the high-energy evolution equation in Quantum Chromodynamics (QCD)
in the framework of the color glass condensate. We rewrite the generating
functional of QCD with the color glass condensate into a representation with
the density of states and a simple eikonal coupling. In this representation we
introduce an auxiliary variable which is identified as the quantum color charge
density consistent with non-commutativity in the operator formalism. We revisit
the derivation of the Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner
(JIMWLK) equation to clarify how the non-commutative nature among the color
charge density operators can be disregarded in the regime where the gluon
density is high.


title:
g_a0-rho-gamma and g_f0-rho-gamma coupling constants in three point QCD
  sum rules

abstract:
  The coupling constant of a0-->rho-gamma and f0-->rho-gamma decays are
calculated using 3-point sum rule. We estimate the coupling constant
g_a0-rho-gamma and g_f0-rho-gamma which are an essential ingredient in the
analysis of physical processes involving isoscalar f0(980) and isovector
a0(980) mesons.


title: Charmonium from Classical Pure SU(3) Yang-Mills Configurations

abstract:
  A generalized Faddeev-Niemi ansatz for the gluon field is discussed. In its
simplest parametrization, the ansatz allows a solution of the classical SU(3)
Yang-Mills equations. From these solutions a confining potential for heavy
quarkonia is defined. The investigation of charmonium spectra proves that the
potential is able to reproduce the experimental spectra at the level of 3%.
Moreover, charmonium leptonic and strong decays are investigated. The results
are in fair agreement with experimental figures and are in line with other
quark model calculations.


title: CP nonconservation in the leptonic sector

abstract:
  In this paper we use an exact method to impose unitarity on moduli of the
neutrino PMNS matrix recently determined, and show how one could obtain
information on CP non-conservation from a limited experimental information. One
suggests a novel type of global fit by expressing all the theoretical
quantities in terms of convention independent parameters: the Jarlskog
invariant $J$ and the moduli $|U_{\alpha i}|$, able to resolve the positivity
problem of $|U_{e 3}|$. In this way the fit will directly provide a value for
$J$, and if it is different from zero it will prove the existence of CP
violation in the available experimental data. If the best fit result,
$|U_{e3}|^2<0$, from M. Maltoni {\em et al}, New J.Phys. {\bf 6} (2004) 122 is
confirmed, it will imply a new physics in the leptonic sector.


title: Quark mass thresholds in QCD thermodynamics

abstract:
  We discuss radiative corrections to how quark mass thresholds are crossed, as
a function of the temperature, in basic thermodynamic observables such as the
pressure, the energy and entropy densities, and the heat capacity of high
temperature QCD. The indication from leading order that the charm quark plays a
visible role at surprisingly low temperatures, is confirmed. We also sketch a
way to obtain phenomenological estimates relevant for generic expansion rate
computations at temperatures between the QCD and electroweak scales, pointing
out where improvements over the current knowledge are particularly welcome.


title:
Heavy-flavor effects in supersymmetric Higgs boson production at hadron
  colliders

abstract:
  We evaluate the effect of the bottom-quark mass on resummed transverse
momentum distributions of supersymmetric Higgs bosons at the Tevatron and LHC.
The mass of the bottom quark acts as a non-negligible momentum scale at small
transverse momenta and affects resummation of soft and collinear radiation in
this region. The improved treatment of the b-quark mass and kinematical effects
lead to observable modifications in the resummed predictions for both
colliders.


title: Susceptibilities and speed of sound from PNJL model

abstract:
  We present the Taylor expansion coefficients of the pressure in quark number
chemical potential $\mu_0=\mu_B / 3=\mu_u=\mu_d$, for the strongly interacting
matter as described by the PNJL model for two light degenerate flavours of
quarks u and d. The expansion has been done upto eighth order in $\mu_0$, and
the results are consistent with recent estimates from Lattice. We have further
obtained the specific heat $C_V$, squared speed of sound $v_s^2$ and the
conformal measure $\cC$.


title: Generalized Modified Gravity in Large Extra Dimensions

abstract:
  We discuss effective interactions among brane matter induced by modifications
of higher dimensional Einstein gravity through the replacement of
Einstein-Hilbert term with a generic function f(R, R_AB R^AB, R_ABCD R^ABCD) of
the curvature tensors. We determine gravi-particle spectrum of the theory, and
perform a comparative analysis of its predictions with those of the Einstein
gravity within Arkani-Hamed--Dvali--Dimopoulos (ADD) setup. We find that this
general higher-curvature quantum gravity theory contributes to scatterings
among both massive and massless brane matter (in contrast to much simpler
generalization of the Einstein gravity, f(R), which influences only the massive
matter), and therefore, can be probed via various scattering processes at
present and future colliders and directly confronted with the ADD expectations.
In addition to collision processes which proceed with tree-level gravi-particle
exchange, effective interactions among brane matter are found to exhibit a
strong sensitivity to higher-curvature gravity via the gravi-particle loops.
Furthermore, particle collisions with missing energy in their final states are
found to be sensitive to additional gravi-particles not found in Einstein
gravity. In general, road to a correct description of quantum gravity above
Fermi energies depends crucially on if collider and other search methods end up
with a negative or positive answer for the presence of higher-curvature
gravitational interactions.


title: Kaon Electroproduction off Proton

abstract:
  The elementary reaction of kaon exclusive electroproduction on protons has
been studied in a broad kinematical range. Data for the calculation of the form
factor of the kaon have been taken at different values of the invariant center
of mass energy W in the range W=1.8, 1.85, 1.98, 2.08 (GeV), for one value of
the transferred 4-momentum Q2=2.35 (GeV/c)2. In this analysis, we calculated
sigma-L and sigma-T by using the Rosenbluth separation. Then the
electromagnetic kaon form factor was calculated by Chew-Low extrapolation.


title: Triviality and the (Supersymmetric) See-Saw

abstract:
  For the D=5 Majorana neutrino mass operator to have a see-saw ultraviolet
completion that is viable up to the Planck scale, the see-saw scale is bounded
above due to triviality limits on the see-saw couplings. For supersymmetric
see-saw models, with realistic neutrino mass textures, we compare constraints
on the see-saw scale from triviality bounds, with those arising from
experimental limits on induced charged-lepton flavour violation, for both the
CMSSM and for models with split supersymmetry.


title:
Collins effect in semi-inclusive deeply inelastic scattering and in
  electron positron annihilation

abstract:
  The Collins fragmentation function is extracted from HERMES data on azimuthal
single spin asymmetries in semi-inclusive deeply inelastic scattering, and
BELLE data on azimuthal asymmetries in electron positron annihilations. A
Gaussian model is assumed for the distribution of transverse parton momenta and
predictions are used from the chiral quark-soliton model for the transversity
distribution function. We find that the HERMES and BELLE data yield a
consistent picture of the Collins fragmentation function which is compatible
with COMPASS data and the information previously obtained from an analysis of
DELPHI data. Estimates for future experiments are made.


title:
Production of q bar-q Pairs in Proton-Nucleus Collisions at High
  Energies

abstract:
  We calculate production of quark-antiquark pairs in high energy
proton-nucleus collisions both in the quasi-classical approximation of
McLerran-Venugopalan model and including quantum small-$x$ evolution. The
resulting production cross section is explicitly expressed in terms of
Glauber-Mueller multiple rescatterings in the classical case and in terms of
dipole-nucleus scattering amplitude in the quantum evolution case. We
generalize the result of one of us (K.T.) beyond the aligned jet
configurations. We expand on the earlier results of Blaizot, Gelis and
Venugopalan by deriving quark production cross section including quantum
evolution corrections in rapidity intervals both between the quarks and the
target and between the quarks and the projectile.


title: Higher-dimensional operators in SUSY SO(10) GUT models

abstract:
  SO(10) GUT models with only small Higgs fields use higher-dimensional
operators to generate realistic fermion mass matrices. In particular, a Higgs
field in the spinor representation, 16^d_H, acquires a weak scale vev. We
include the weak vev of the corresponding field \bar{16}^u_H and investigate
the effect on two successful models, one by Albright and Barr (AB) and another
by Babu, Pati and Wilczek (BPW). We find that the BPW model is a particular
case within a class of models with identical fermion masses and mixings. In
contrast, we expect corrections to the parameters of AB-type models.


title: New Regions for a Chameleon to Hide

abstract:
  We show that inclusion of an extremely small quartic coupling constant in the
potential for a nearly massless scalar field greatly increases the
experimentally allowed region for the mass term and the coupling of the field
to matter.


title: Yukawa and Tri-scalar Processes in Electroweak Baryogenesis

abstract:
  We derive the contributions to the quantum transport equations for
electroweak baryogenesis due to decays and inverse decays induced by tri-scalar
and Yukawa interactions. In the Minimal Supersymmetric Standard Model (MSSM),
these contributions give rise to couplings between Higgs and fermion
supermultiplet densities, thereby communicating the effects of CP-violation in
the Higgs sector to the baryon sector. We show that the decay and inverse
decay-induced contributions that arise at zeroth order in the strong coupling,
\alpha_s, can be substantially larger than the O(\alpha_s) terms that are
generated by scattering processes and that are usually assumed to dominate. We
revisit the often-used approximation of fast Yukawa-induced processes and show
that for realistic parameter choices it is not justified. We solve the
resulting quantum transport equations numerically with special attention on the
impact of Yukawa rates and study the dependence of the baryon-to-entropy ratio
Y_B on MSSM parameters.


title:
A_4 symmetry and prediction of U_{e3} in a modified Altarelli-Feruglio
  model

abstract:
  We show that a modification of a recently proposed model by Altarelli and
Feruglio with softly broken $A_4$ symmetry leads naturally to nonvanishing
$U_{e3}$ with $\theta_{13}\simeq 2^o - 4^o$. The observed mass squared
differences for solar and atmospheric neutrinos have been fitted without fine
tuning among model parameters. The predicted solar neutrino mixing angle is
brought down from the tri-bimaximal prediction to be in concordance with the
latest global analysis including experimental data from KamLAND and SNO.


title:
On the inclusive gluon jet production from the triple pomeron vertex in
  the perturbative QCD

abstract:
  Single and double inclusive cross-sections for gluon jet production from
within the triple pomeron vertex are studied in the reggeized gluon technique.
It is shown that to satisfy the AGK rules the vertex has to be fully symmetric
in all four reggeized gluons which form the two final pomerons. The single
inclusive cross-sections are found for different cuttings of the triple pomeron
vertex. They sum into the expression obtained by Yu.Kovchegov and K.Tuchin in
the colour dipole picture. The found double inclusive cross-sections satisfy
the AGK rules.


title: Omega-phi mixing in chiral perturbation theory

abstract:
  We investigate omega-phi meson mixing to leading order in chiral perturbation
theory utilizing the antisymmetric tensor field formulation. We update the
quark mass ratio R from rho-omega mixing, R = 42 \pm 4.


title:
An improved study of the kappa resonance and the non-exotic $s$ wave
  $\pi K$ scatterings up to $\sqrt{s}=2.1$GeV of LASS data

abstract:
  We point out that the dispersion relation for the left hand cut integral
presented in one of our previous paper (Nucl. Phys. {\bf A}733(2004)235) is
actually free of subtraction constant, even for unequal mass elastic
scatterings. A new fit to the LASS data~\cite{Aston} is performed and firm
evidence for the existence of $\kappa$ pole is found. The correct use of
analyticity also put strong constraints on threshold parameters -- which are
found to be in good agreement with those obtained from chiral theories. We also
determined the pole parameters of $K_0^*(1430)$ on the second sheet, and
reconfirm the existence of $K_0^*(1950)$ on the third sheet. We stress that the
LASS data do not require them to have the twin pole structure of a typical
Breit--Wigner resonance.


title: Higher-Twist Distribution Amplitudes of the K Meson in QCD

abstract:
  We present a systematic study of twist-3 and twist-4 light-cone distribution
amplitudes of the K meson in QCD. The structure of SU(3)-breaking corrections
is studied in detail. Non-perturbative input parameters are estimated from QCD
sum rules and renormalons. As a by-product, we give a complete reanalysis of
the twist-3 and -4 parameters of the pi-meson distribution amplitudes; some of
the results differ from those usually quoted in the literature.


title: How Nuclear Diffuseness Affects RHIC Data

abstract:
  The fact that nuclei have diffuse surfaces (rather than being simple spheres)
has dramatic consequences on the interpretation of RHIC heavy-ion data.
  The effect is quite small (but not negligible) for central collisions, but
gets increasingly important with decreasing centrality.
  One may actually divide the collision zone into a central part ("core"), with
expected high energy densities, and a peripheral part ("corona"), with smaller
energy densities, more like in pp or pA collisions.
  We will discuss that many complicated "features" observed at RHIC become
almost trivial after subtracting the corona background. We are focussing on
AuAu collisions at 200 GeV.


title:
Nonperturbative Effects in Event Shapes from Soft-Collinear Effective
  Theory

abstract:
  Soft-collinear effective theory (SCET) is used to demonstrate factorization
for event shape distributions in the two-jet region. The leading
nonperturbative power corrections to these distributions can be characterized
as shape functions defined in terms of Wilson lines of soft gluons. The
relation of these results to the well-known predictions for shifts in the
distributions induced by the leading power corrections is discussed.


title: Universality of Nonperturbative Effects in Event Shapes

abstract:
  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 of soft gluons in the shape functions leads to a
proof of universality for power corrections to the mean values of event shapes,
without invoking the single gluon approximation.


title: Collider Signatures of SuperWIMP Warm Dark Matter

abstract:
  SuperWeakly-Interacting Massive Particles (superWIMPs) produced in the late
decays of other particles are well-motivated dark matter candidates and may be
favored over standard Weakly-Interacting Massive Particles (WIMPs) by small
scale structure observations. Among the most promising frameworks that
incorporate superWIMPs are R-parity conserving supersymmetry models in which
the lightest supersymmetric particle (LSP) is the gravitino or the axino. In
these well-defined particle models, astrophysical observations have direct
implications for possible measurements at future colliders.


title:
A Consistent Prescription for the Production Involving Massive Quarks in
  Hadron Collisions

abstract:
  This paper addresses the issue of production of charm or bottom quarks in
association with a high pT process in hadron hadron collision. These quarks can
be produced either as part of the hard scattering process or as a remnant from
the structure functions. The latter sums terms of the type (alpha_s
log(pT/mq))^n. If structure functions of charm or bottom quarks are used
together with a hard process which also allows production of these quarks
double counting occurs. This paper describes the correct procedure and provides
two examples of its implimentation in single top and Drell-Yan at the LHC.


title: Shape of the Unitary Triangle and Phase Conventions of the CKM Matrix

abstract:
  A shape of the unitary triangle versus a CP violating parameter \delta
depends on the phase conventions of the CKM matrix, because the CP violating
parameter \delta cannot directly be observed, so that it is not
rephasing-invariant. In order to seek for a clue to the quark mass matrix
structure and the origin of the CP violation, the dependence of the unitary
triangle shape on the parameter \delta is systematically investigated.


title: Production of doubly charmed baryons in B decays

abstract:
  We study the doubly charmed baryonic B decays $B\to \Xi_{c} \Lambda_{c}$ and
$B\to \Lambda^{+}_{c} \Lambda^{-}_{c} K$, recently observed by BELLE. We find
that the unexpected large branching ratios (BRs) could be ascribed to the final
state interactions (FSIs), which are dictated by $B\to DD^{+}_{s}\to \Xi_{c}
\Lambda^{+}_{c}$ and $B\to \bar D^0 D^{0} K\to \Lambda^{+}_{c} \Lambda^{-}_{c}
K$. By utilizing the same mechanism, we predict that the BRs for $B^{+}\to \bar
\Xi^{0}_{c} \Sigma^{+}_{c}$ and $B^{+} \to \Sigma^{\mp}_{c} \Lambda^{\pm}_{c}
K^{+}$ decays could be as large as $BR(B^{+}\to \bar\Xi^{0}_{c}
\Lambda^{+}_{c})$ and $10^{-4}$, respectively. In addition, extending the FSIs
to the processes associated with the creation of the $s\bar s$ pair,
$BR(B^{+}\to \bar \Omega_{c} \Xi^{+}_{c})$ at percent level is achievable.


title: Scattering amplitudes with massive fermions using BCFW recursion

abstract:
  We study the QCD scattering amplitudes for \bar{q}q \to gg and \bar{q}q \to
ggg where q is a massive fermion. Using a particular choice of massive fermion
spinor we are able to derive very compact expressions for the partial spin
amplitudes for the 2 \to 2 process. We then investigate the corresponding 2 \to
3 amplitudes using the BCFW recursion technique. For the helicity conserving
partial amplitudes we again derive very compact expressions, but were unable to
treat the helicity-flip amplitudes recursively, except for the case where all
the gluon helicities are the same. We therefore evaluate the remaining partial
amplitudes using standard Feynman diagram techniques.


title:
Dynamically generated 0^+ heavy mesons in a heavy chiral unitary
  approach

abstract:
  In terms of the heavy chiral Lagrangian and the unitarized coupled-channel
scattering amplitude, interaction between the heavy meson and the light
pseudoscalar meson is studied. By looking for the pole of scattering matrix on
an appropriate Riemann sheet, a $DK$ bound state $D_{s0}^*$ with the mass of
$2.312\pm0.041$ GeV is found. This state can be associated as the narrow
$D_{sJ}^*(2317)$ state found recently. In the same way, a $B{\bar K}$ bound
state $B_{s0}^*$ is found, and its mass of $5.725\pm0.039$ GeV is predicted.
The spectra of $D_0^*$ and $B_0^*$ with $I=1/2$ are further investigated. One
broad and one narrow states are predicted in both charm and bottom sectors. The
coupling constants and decay widths of the predicted states are also
calculated.


title: BFKL Pomeron in string models

abstract:
  We consider scattering amplitudes in string models in the Regge limit of high
energies and fixed momentum transfers with the use of the unitarity in direct
channels. Intermediate states are taken in the multi-Regge kinematics
corresponding to the production of resonances with fixed invariant masses and
large relative rapidities. In QCD such kinematics leads to the BFKL equation
for the Pomeron wave function in the leading logarithmic approximation. We
derive a similar equation in the string theory and discuss its properties. The
purpose of this investigation is to find a generalization of the BFKL approach
to the region of small momentum transfers where non-perturbative corrections to
the gluon Regge trajectory and reggeon couplings are essential. The BFKL
equation in the string theory contains additional contributions coming from a
linear part of the Regge trajectory and from the soft Pomeron singularity
appearing already in the tree approximation. In higher dimensions in addition,
a non-multi-Regge kinematics corresponding to production of particles with
large masses is important. We solve the equation for the Pomeron wave function
in the string theory for D=4 and discuss integrability properties of analogous
equations for composite states of several reggeised gluons in the multi-colour
limit.


title: Transverse-Momentum Resummation for Slepton-Pair Production at the LHC

abstract:
  We perform a first precision calculation of the transverse-momentum (q_T)
distribution of slepton pair and slepton-sneutrino associated production at the
CERN Large Hadron Collider (LHC). We implement soft-gluon resummation at the
next-to-leading logarithmic (NLL) level and consistently match the obtained
result to the pure fixed-order perturbative result at leading order (LO) in the
QCD coupling constant, i.e. O(alpha_s). We give numerical predictions for
stau_1 stau_1^* and stau_1 sneutrino_tau^* + stau_1^* sneutrino_tau production,
also implementing recent parameterizations of non-perturbative effects. The
results show a relevant contribution of resummation both in the small and
intermediate q_T-regions and little dependence on unphysical scales and
non-perturbative contributions.


title:
The fundamental symmetries in the neutral kaon system -- a pedagogical
  choice --

abstract:
  During the recent years experiments with neutral kaons have yielded
remarkably sensitive results which are pertinent to such fundamental phenomena
as CPT invariance (protecting causality), time-reversal invariance violation,
coherence of wave functions, and entanglement of kaons in pair states. We
describe the phenomenological developments and the theoretical conclusions
drawn from the experimental material. An outlook to future experimentation is
indicated. An overview of formal similarities in fields outside neutral kaons
is included.


title:
Testing the Ginzburg-Landau approximation for three-flavor crystalline
  color superconductivity

abstract:
  It is an open challenge to analyze the crystalline color superconducting
phases that may arise in cold dense, but not asymptotically dense, three-flavor
quark matter. At present the only approximation within which it seems possible
to compare the free energies of the myriad possible crystal structures is the
Ginzburg-Landau approximation. Here, we test this approximation on a
particularly simple "crystal" structure in which there are only two condensates
$<us > \sim \Delta \exp(i {\bf q_2}\cdot {\bf r})$ and $<ud > \sim \Delta
\exp(i {\bf q_3}\cdot {\bf r})$ whose position-space dependence is that of two
plane waves with wave vectors ${\bf q_2}$ and ${\bf q_3}$ at arbitrary angles.
For this case, we are able to solve the mean-field gap equation without making
a Ginzburg-Landau approximation. We find that the Ginzburg-Landau approximation
works in the $\Delta\to 0$ limit as expected, find that it correctly predicts
that $\Delta$ decreases with increasing angle between ${\bf q_2}$ and ${\bf
q_3}$ meaning that the phase with ${\bf q_2}\parallel {\bf q_3}$ has the lowest
free energy, and find that the Ginzburg-Landau approximation is conservative in
the sense that it underestimates $\Delta$ at all values of the angle between
${\bf q_2}$ and ${\bf q_3}$.


title: Little Higgs Dark Matter

abstract:
  The introduction of T parity dramatically improves the consistency of Little
Higgs models with precision electroweak data, and renders the lightest T-odd
particle (LTP) stable. In the Littlest Higgs model with T parity, the LTP is
typically the T-odd heavy photon, which is weakly interacting and can play the
role of dark matter. We analyze the relic abundance of the heavy photon,
including its coannihilations with other T-odd particles, and map out the
regions of the parameter space where it can account for the observed dark
matter. We evaluate the prospects for direct and indirect discovery of the
heavy photon dark matter. The direct detection rates are quite low and a
substantial improvement in experimental sensitivity would be required for
observation. A substantial flux of energetic gamma rays is produced in the
annihilation of the heavy photons in the galactic halo. This flux can be
observed by the GLAST telescope, and, if the distribution of dark matter in the
halo is favorable, by ground-based telescope arrays such as VERITAS and HESS.


title: A Conserved Vector Current test using low energy beta-beams

abstract:
  We discuss the possibility of testing the weak currents and, in particular,
the weak magnetism term through the measurement of the electron anti-neutrinos
capture by protons at a low energy beta-beam facility. We analyze the
sensitivity using both the total number of events and the angular distribution
of the positrons emitted in a water Cerenkov detector. We show that the weak
magnetism form factor might be determined with better than several percent
accuracy using the angular distribution. This offers a new way of testing the
Conserved Vector Current hypothesis.


title:
Charm Quark Contribution to K+ -> pi+ nu anti-nu at
  Next-to-Next-to-Leading Order

abstract:
  We calculate the complete NNLO QCD corrections to the charm contribution of
the rare decay K+ -> pi+ nu nu-bar. We encounter several new features, which
were absent in lower orders. We discuss them in detail and present the results
for the 2-loop matching conditions of the Wilson coefficients, the 3-loop
anomalous dimensions, and the 2-loop matrix elements of the relevant operators
that enter the NNLO renormalization group analysis of the Z-penguin and the
electroweak box contribution. The inclusion of the NNLO QCD corrections leads
to a significant reduction of the theoretical uncertainty from 9.8% down to
2.4% in the relevant parameter Pc, implying the leftover scale uncertainties in
BR(K+ -> pi+ nu nu-bar) and in the determination of |V_td|, sin(2 beta), and
gamma from the K -> pi nu nu system to be 1.3%, 1.0%, 0.006, and 1.2 degrees,
respectively. For the charm quark MSbar mass mc=(1.30+-0.05) GeV and |V_us|=
0.2248 the NLO value Pc=0.37+-0.06 is modified to Pc=0.38+-0.04 at the NNLO
level with the latter error fully dominated by the uncertainty in mc. We
present tables for Pc as a function of mc and alphas(MZ) and a very accurate
analytic formula that summarizes these two dependences as well as the dominant
theoretical uncertainties. Adding the recently calculated long-distance
contributions we find BR(K+ -> pi+ nu nu-bar)=(8.0+-1.1)*10^-11 with the
present uncertainties in mc and the Cabibbo-Kobayashi-Maskawa elements being
the dominant individual sources in the quoted error. We also emphasize that
improved calculations of the long-distance contributions to K+ -> pi+ nu nu-bar
and of the isospin breaking corrections in the evaluation of the weak current
matrix elements from K+ -> pi0 e+ nu would be valuable in order to increase the
potential of the two golden K -> pi nu nu decays in the search for new physics.


title:
The Bounds on the magnetic moment of the tau-neutrino via the process
  (e+e-)-->nunu(bar)gamma

abstract:
  Bounds on the anamolous magnetic moment of the tau neutrino are calculated
through the reaction (e+e-)-->nunu(bar)gamma at the neutral boson pole and in
the framework of an extended standard model, a left-right symmetric model and a
superstring-inspired model which has one extra low-energy neutral gauge boson.
The results are based


title: Numerical Approach to Multi Dimensional Phase Transitions

abstract:
  We present an algorithm to analyze numerically the bounce solution of
first-order phase transitions. Our approach is well suited to treat phase
transitions with several fields. The algorithm consists of two parts. In the
first part the bounce solution without damping is determined, in which case
energy is conserved. In the second part the continuation to the physically
relevant case with damping is performed. The presented approach is numerically
stable and easily implemented.


title: The minimal non-minimal standard model

abstract:
  In this letter I discuss a class of extensions of the standard model that
have a minimal number of possible parameters, but can in principle explain dark
matter and inflation. It is pointed out that the so-called new minimal standard
model contains a large number of parameters that can be put to zero, without
affecting the renormalizability of the model. With the extra restrictions one
might call it the minimal (new) non minimal standard model (MNMSM). A few
hidden discrete variables are present. It is argued that the inflaton should be
higher-dimensional. Experimental consequences for the LHC and the ILC are
discussed.


title: Weak corrections to gluon-induced top-antitop hadro-production

abstract:
  We calculate purely weak virtual one-loop corrections to the production cross
section of top-antitop pairs at the Large Hadron Collider via the gluon-gluon
fusion subprocess. We find very small negative corrections to the total cross
section, of order -0.6%, but significantly larger effects to the differential
one, particularly in the transverse momentum distribution, of order -5% to -10%
(in observable regions). In case of parity-conserving spin-asymmetries of the
final state, $\alpha_{\mathrm{S}}^2\alpha_{\mathrm{W}}$ corrections are
typically of a few negative percent, with the exception of positive and
negative peaks at $+12%$ and -5%, respectively (near where the tree-level
predictions change sign), while those arising in parity-violating asymmetries
(which are identically zero in QCD) are typically at a level of a few permille.


title: Comprehensive Interpretation of Thermal Dileptons at the SPS

abstract:
  Employing thermal dilepton rates based on medium-modified electromagnetic
correlation functions we show that recent dimuon spectra of the NA60
collaboration in central In-In collisions at the CERN-SPS can be understood in
terms of radiation from a hot and dense hadronic medium. Earlier calculated
\rho-meson spectral functions, as following from hadronic many-body theory,
provide an accurate description of the data up to dimuon invariant masses of
about M\simeq 0.9 GeV, with good sensitivity to details of the predicted
\rho-meson line shape. This, in particular, identifies baryon-induced effects
as the prevalent ones. We show that a reliable description of the \rho
contribution opens the possibility to study further medium effects: at higher
masses (M \simeq 0.9-1.5 GeV) 4-pion type annihilation is required to account
for the experimentally observed excess indicating precursor effects of chiral
symmetry restoration (``chiral mixing''), while remaining structures in the
\omega and \phi region are suggestive for modifications in their line shapes as
well.


title:
Di-photon Higgs signals at the LHC in the Next-to-Minimal Supersymmetric
  Standard Model

abstract:
  The NMSSM contains a Higgs singlet in addition to the two Higgs doublets
typical of the MSSM, thus resulting in a total of seven physical Higgs mass
states. Therefore, the phenomenology of the NMSSM Higgs sector can vary
considerably from that of the MSSM and there are good prospects of finding in
regions of the NMSSM parameter space Higgs signals that cannot be reproduced in
the MSSM. We examined here the two-photon decay mode of a Higgs boson and found
that up to three neutral Higgs states, heavy and/or light, could be
simultaneously observable at the LHC, a possibility precluded to the MSSM.
There are also some possibilities that only the lightest NMSSM Higgs boson be
detectable via this mode, with a mass beyond the upper limit of the
corresponding MSSM state, thus also allowing to distinguish between the two
scenarios. However, in most of the NMSSM parameter space the configurations of
the non-minimal model are not very different from those arising in the minimal
case.


title:
Fermion masses and proton decay in a minimal five-dimensional SO(10)
  model

abstract:
  We propose a minimal SO(10) model in 5 space-time dimensions. The single
extra spatial dimension is compactified on the orbifold S^1/(Z_2 x Z_2')
reducing the gauge group to that of Pati-Salam. The breaking down to the
standard model group is obtained through an ordinary Higgs mechanism taking
place at the Pati-Salam brane, giving rise to a proper gauge coupling
unification. We achieve a correct description of fermion masses and mixing
angles by describing first and second generations as bulk fields, and by
embedding the third generation into four multiplets located at the Pati-Salam
brane. The Yukawa sector is simple and compact and predicts a neutrino spectrum
of normal hierarchy type. Concerning proton decay, dimension five operators are
absent and the essentially unique localization of matter multiplets implies
that the minimal couplings between the super-heavy gauge bosons and matter
fields are vanishing. Non-minimal interactions are allowed but the resulting
dimension six operators describing proton decay are too suppressed to produce
observable effects, even in future, super-massive detectors.


title: The Battle of Albuera, the FC Liverpool and the Standard Model

abstract:
  The Standard Model despite its well-known short comings is unlikely to yield
without offering stubborn resistance. There are compelling arguments that New
Physics lurks around the TeV scale. Continuing comprehensive studies of beauty,
$\tau$ and charm transitions can be instrumentalized to reveal it and shed
light on it. They are thus complementary to findings obtained at the LHC and
presumably essential in clarifying the true nature of that New Physics. A
Super-B facility seems to provide the cleanest environment for pursuing such an
ambitious program. I list desirable features of such a setup as well as
challenges for the accelerator and detector designs and for the theoretical
analysis.


title:
The rare decays B --> K(*) anti-K(*) and R-parity violating
  supersymmetry

abstract:
  We study the branching ratios, the direct CP asymmetries in $B\to
K^{(*)}\bar{K}^{(*)}$ decays and the polarization fractions of $B\to
K^{*}\bar{K}^{*}$ decays by employing the QCD factorization in the minimal
supersymmetric standard model with R-parity violation. We derive the new upper
bounds on the relevant R-parity violating couplings from the latest
experimental data of $B\to K^{(*)}\bar{K}^{(*)}$, and some of these constraints
are stronger than the existing bounds. Using the constrained parameter spaces,
we predict the R-parity violating effects on the other quantities in $B\to
K^{(*)}\bar{K}^{(*)}$ decays which have not been measured yet. We find that the
R-parity violating effects on the branching ratios and the direct $CP$
asymmetries could be large, nevertheless their effects on the longitudinal
polarizations of $B\to K^{*}\bar{K}^{*}$ decays are small. Near future
experiments can test these predictions and shrink the parameter spaces.


title: Decays of sigma, kappa, a0(980) and fo(980)

abstract:
  Ratios of coupling constants for these decays are compared with q-qbar
predictions and Jaffe's 4-quark model. In both models, the predicted ratio
g^2(kappa -> K-pi)/ g^2(sigma -> pi-pi) is much too small. Also, for q-qbar,
the predicted ratio g^2(kappa -> K-eta ')/g^2(kappa -> K-pi) is much larger
than observed. Both models fail for g^2(fo -> KK)/g^2(a0 -> KK). This ratio
requires that fo has a dominant KK component. It arises naturally because the
fo pole lies very close to the KK threshold, giving its wave function a long KK
tail.


title:
Production of Triply Charmed $\Omega_{ccc}$ Baryons in $e^+e^-$
  Annihilation

abstract:
  The total and differential cross sections for the production of triply
charmed $\Omega_{ccc}$ baryons in $e^{+}e^{-}$ annihilation are calculated at
the $Z$-boson pole.


title:
On the Quasi-fixed Point in the Running of CP-violating Phases of
  Majorana Neutrinos

abstract:
  Taking the standard parametrization of three-flavor neutrino mixing, we
carefully examine the evolution of three CP-violating phases $(\delta,
\alpha^{}_1, \alpha^{}_2)$ with energy scales in the realistic limit
$\theta^{}_{13} \to 0$. If $m^{}_3$ vanishes, we find that the one-loop
renormalization-group equation (RGE) of $\delta$ does not diverge and its
running has no quasi-fixed point. When $m^{}_3 \neq 0$ holds, we show that the
continuity condition derived by Antusch {\it et al} is always valid, no matter
whether the $\tau$-dominance approximation is taken or not. The RGE running of
$\delta$ undergoes a quasi-fixed point determined by a nontrivial input of
$\alpha^{}_2$ in the limit $m^{}_1 \to 0$. If three neutrino masses are nearly
degenerate, it is also possible to arrive at a quasi-fixed point in the RGE
evolution of $\delta$ from the electroweak scale to the seesaw scale or vice
versa. Furthermore, the continuity condition and the quasi-fixed point of
CP-violating phases in another useful parametrization are briefly discussed.


title: Anomalous Viscosity of an Expanding Quark-Gluon Plasma

abstract:
  We argue that an expanding quark-gluon plasma has an anomalous viscosity,
which arises from interactions with dynamically generated color fields. We
derive an expression for the anomalous viscosity in the turbulent plasma domain
and apply it to the hydrodynamic expansion phase, when the quark-gluon plasma
is near equilibrium. The anomalous viscosity dominates over the collisional
viscosity for weak coupling and not too late times. This effect may provide an
explanation for the apparent ``nearly perfect'' liquidity of the matter
produced in nuclear collisions at the Relativistic Heavy Ion Collider without
the assumption that it is a strongly coupled state.


title: Charmonium spectrum and new observed states

abstract:
  The linearity and parallelism of Regge trajectories is combined with a
hyperfine splitting relation in multiplet to study charmonium spectrum. It is
found that predictions to the spectrum of 1D multiplet could be made once
another 1D state is confirmed. The newly observed X(3872), Y(3940), X(3940),
Y(4260) and Z(3930) are studied within the charmonium framework.


title:
Consequences of Partial Vector Meson Dominance for the Phenomenology of
  Colored Technihadrons

abstract:
  In this paper we address the question: ``do the limits on technirho
production at the Tevatron mean what we think they do ?'' These limits are
based on calculations that rely on Vector Meson Dominance (VMD). VMD was
invented in order to describe the interaction of electrons with hadrons (the
rho meson and pions). The method has been used also as a tool in the study of
Technicolor phenomenology. Nevertheless there are evidences in the sense that,
even in its original, context VMD is not completely realized. In this work we
investigate the consequences of a deviation from complete VMD for the
phenomenology of colored technihadrons. We focus specially on the production of
the color octet technirho and color triplet technipions. We found that a
relative small direct coupling of the proto-technirho to quarks is enough to
suppress or even eliminate the interaction among quarks and the physical
technirho. On the other hand, it is possible to suppress the coupling of the
physical technirho to technipions but in this case a large interaction among
the technipions and the proto-gluon must be introduced. The consequences for
the limits on the mass of the color octet technirho are also investigated.


title: Natural Implementation of Neutralino Dark Matter

abstract:
  The prediction of neutralino dark matter is generally regarded as one of the
successes of the Minimal Supersymmetric Standard Model (MSSM). However the
successful regions of parameter space allowed by WMAP and collider constraints
are quite restricted. We discuss fine-tuning with respect to both dark matter
and Electroweak Symmetry Breaking (EWSB) and explore regions of MSSM parameter
space with non-universal gaugino and third family scalar masses in which
neutralino dark matter may be implemented naturally. In particular allowing
non-universal gauginos opens up the bulk region that allows Bino annihilation
via t-channel slepton exchange, leading to ``supernatural dark matter''
corresponding to no fine-tuning at all with respect to dark matter. By contrast
we find that the recently proposed ``well tempered neutralino'' regions involve
substantial fine-tuning of MSSM parameters in order to satisfy the dark matter
constraints, although the fine tuning may be ameliorated if several
annihilation channels act simultaneously. Although we have identified regions
of ``supernatural dark matter'' in which there is no fine tuning to achieve
successful dark matter, the usual MSSM fine tuning to achieve EWSB always
remains.


title:
A Remark on Vector Meson Dominance, Universality and the Pion Form
  Factor

abstract:
  In this paper, we address the universality problem in the mass-mixing
representation of vector meson dominance. First we stress the importance of
using physical (mass eigenstate) fields in order to get the correct $q^2$
dependence of the pion form factor. Then we show that, when a direct coupling
of the (proto-)photon to the pions is included, it is not necessary to invoke
universality. Our method is similar to the delocalization idea in some
deconstrunction theories.


title:
Four Generation CP Violation in B -> phi K^0, pi^0 K^0, eta' K^0 and
  Hadronic Uncertainties

abstract:
  The fourth generation can give the correct trend of S_{phi K^0}, S_{pi^0 K^0}
< sin2phi_1/beta, as indicated by data, and the effect, being largely leading
order, is robust against hadronic uncertainties. The effect on S_{eta' K^0},
however, is diluted away by hadronic effects, and S_{eta' K^0} \simeq
sin2phi_1/beta is expected. The near maximal arg[V^*_{t's}V_{t'b}] \lesssim
90^\circ that is needed could resolve the unequal direct CP violation seen in B
-> K^+ pi^- and K^+ pi^0 modes, and is consistent with b ->s l^+l^- and B_s
mixing constraints.


title:
Interesting radiative patterns of neutrino mass in an SU(3)_C X SU(3)_L
  X U(1)_X model with right-handed neutrinos

abstract:
  We investigate a simple model of neutrino mass based on SU(3)_C X SU(3)_L X
U(1)_X gauge unification. The Yukawa coupling of the model has automatic
lepton-number symmetry which is broken only by the self-couplings of the Higgs
boson. At tree level, neutrino spectrum contains three Dirac fermions, one
massless and two degenerate in mass. At the two loop-level, neutrinos obtain
Majorana masses and correct the tree-level result which naturally gives rise to
an inverted hierarchy mass pattern and interesting mixing which can fit the
current data with minor fine-tuning. In another scenarios, one can pick the
scales such that the loop-induced Majorana mass matrix is bigger than the Dirac
one and thus reproduces the usual seesaw mechanism.


title: Quark pair production in high energy pA collisions: General features

abstract:
  A consistent treatment of both multiple scattering and small x quantum
evolution effects on pair production in high energy pA collisions is feasible
in the framework of the Color Glass Condensate (hep-ph/0402257). We first
discuss the properties of quark pair production in the classical effective
theory where only multiple scattering effects are included. Explicit results
are given for pair production as a function of the invariant mass of pairs, the
pair momenta, the atomic mass number A and the quark mass. We relate the
logarithms that appear in our formulation of pair production to logarithms that
appear in the limit of collinear factorization in QCD. Violations of kT
factorization and medium modifications, as represented by the Cronin effect,
are also investigated. We next consider how small x quantum evolution
(shadowing) effects modify the results for pair production. In particular, we
provide results for the rapidity distribution of pairs and the dependence of
the Cronin effect on rapidity. We discuss the dependence of our results on the
initial conditions for small x evolution and comment on its implications for
pair production at RHIC and the LHC.


title: Interactions of multi-quark states in the chromodielectric model

abstract:
  We investigate 4-quark ($qq\bar{q}\bar{q}$) systems as well as multi-quark
states with a large number of quarks and anti-quarks using the chromodielectric
model. In the former type of systems the flux distribution and the
corresponding energy of such systems for planar and non-planar geometries are
studied. From the comparison to the case of two independent $q\bar{q}$-strings
we deduce the interaction potential between two strings. We find an attraction
between strings and a characteristic string flip if there are two degenerate
string combinations between the four particles. The interaction shows no strong
Van-der-Waals forces and the long range behavior of the potential is well
described by a Yukawa potential, which might be confirmed in future lattice
calculations. The multi-quark states develop an inhomogeneous porous structure
even for particle densities large compared to nuclear matter constituent quark
densities. We present first results of the dependence of the system on the
particle density pointing towards a percolation type of transition from a
hadronic matter phase to a quark matter phase. The critical energy density is
found at $\epsilon_c = 1.2 GeV/fm^3$.


title: Real and Imaginary Elements of Fermion Mass Matrices

abstract:
  Prompted by the recent better determination of the angles of the unitarity
triangle, we re-appraise the problem of finding simple fermion mass textures,
possibly linked to some symmetry principle and compatible with grand
unification. In particular, the indication that the angle alpha is close to
rectangle turns out to be the crucial ingredient leading us to single out
fermion mass textures whose elements are either real or purely imaginary. In
terms of the five parameters ascribed to the quark sector, these textures
reproduce the eight experimental data on quark mass ratios and mixings within 1
sigma. When embedded in an SU(5) framework, these textures suggest a common
origin for quark and lepton CP violations, also linked to the spontaneous
breaking of the gauge group.


title: CP, T and CPT analyses in EPR - correlated $ B^0 \bar B ^0 $ decays

abstract:
  In this work we study the T, CP and CPT symmetries in the B-meson system. Our
analysis and results are addressed to the case of correlated mesons in the
B-factories.
  In the first set of theory and results we investigate the consequences of
these discrete symmetries in the B-mixing and interference between mixing and
decay. With the help of the CP-tag we compute all possible intensities and
asymmetries which concern flavour-specific and CP Golden Plate decays. Our
proposed observables are a new self-consistency check for the Standard Model,
as well as a new exploration for the traces of the discrete symmetries in the
B-system.
  In the second set of results we study CPT violation in the initial state of
the B-factories through the loss of indistinguishability of $B^0$ and $\bar
B^0$. We show that, if the consequence of Bose statistic is relaxed, then the
equal-sign dilepton events are considerably modified. We analyze the demise of
flavour tagging and we also prove that the equal-sign charge asymmetry,
$A_{sl}$, is an optimal observable where to look for this new CPT violation
effect. The detailed study of this asymmetry allows us to predict different
behaviours according to the possible values of the CPT violating parameter
$\w$. We conclude that the best observable where to find traces of this novel
kind of CPT violation is the analysis of $A_{sl}$ at small $\Dt$'s. We use
existing data on $A_{sl}$ to put the first limits on $\w$.


title: Regge Trajectories and Renormalization Group

abstract:
  On the basis of the RG invariance we show, in particular, that the Regge
trajectory intercept cannot be calculated as a function of the coupling
constant.


title: Quark Mass Ratios and Mixing Angles from SU(3) Family Gauge Symmetry

abstract:
  We explore a framework for the computation of quark mass ratios and CKM
mixing angles based on an SU(3) family gauge symmetry. The four ratios md/mb,
ms/mb, mu/mt, and mc/mt can be fit at one-loop in the family gauge interaction.
The same is true of the quark mixing angles theta12 and theta23, although the
result for theta13 is too small. The CP violating phase is naturally O(1).


title: Top Pair Production in Randall-Sundrum Models

abstract:
  If the lowest lying Kaluza-Klein states in Randall-Sundrum (RS1) models have
masses in the 10-100 TeV range, direct production of these states at the LHC or
ILC is impossible, and electroweak precision measurements may not be
sufficiently sensitive. We address the possibility that high-precision
measurements of top pair production at the ILC may provide the first evidence
of these states. We consider RS1 models with fermions on and off the brane,
with bulk left and right handed mass terms, discuss brane kinetic terms and
calculate corrections to top pair production in these models.


title:
Constraints on B and Higgs Physics in Minimal Low Energy Supersymmetric
  Models

abstract:
  We study the implications of minimal flavor violating low energy
supersymmetry scenarios for the search of new physics in the B and Higgs
sectors at the Tevatron collider and the LHC. We show that the already
stringent Tevatron bound on the decay rate B_s -> mu+ mu- sets strong
constraints on the possibility of generating large corrections to the mass
difference Delta M_s of the B_s eigenstates. We also show that the B_s -> mu+
mu- bound together with the constraint on the branching ratio of the rare decay
b -> s gamma has strong implications for the search of light, non-standard
Higgs bosons at hadron colliders. In doing this, we demonstrate that the former
expressions derived for the analysis of the double penguin contributions in the
Kaon sector need to be corrected by additional terms for a realistic analysis
of these effects. We also study a specific non-minimal flavor violating
scenario, where there are flavor changing gluino-squark-quark interactions,
governed by the CKM matrix elements, and show that the B and Higgs physics
constraints are similar to the ones in the minimal flavor violating case.
Finally we show that, in scenarios like electroweak baryogenesis which have
light stops and charginos, there may be enhanced effects on the B and K mixing
parameters, without any significant effect on the rate of B_s -> mu+ mu-.


title: Leptogenesis beyond the limit of hierarchical heavy neutrino masses

abstract:
  We calculate the baryon asymmetry of the Universe in thermal leptogenesis
beyond the usual lightest right-handed (RH) neutrino dominated scenario (N_1DS)
and in particular beyond the hierarchical limit (HL), M_1 << M_2 << M_3, for
the RH neutrino mass spectrum. After providing some orientation among the large
variety of models, we first revisit the central role of the N_1DS, with new
insights on the dynamics of the asymmetry generation and then discuss the main
routes departing from it, focusing on models beyond the HL. We study in detail
two examples of `strong-strong' wash-out scenarios: one with `maximal phase'
and the limit of very large M_3, studying the effects arising when
delta_2=(M_2-M_1)/M_1 is small. We extend analytical methods already applied to
the N_1DS showing, for example, that, in the degenerate limit (DL), the
efficiency factors of the RH neutrinos become equal with the single decay
parameter replaced by the sum. Both cases disprove the misconception that close
RH neutrino masses necessarily lead to a final asymmetry enhancement and to a
relaxation of the lower bounds on M_1 and on the initial temperature of the
radiation-dominated expansion. We also explain why leptogenesis tends to favor
normal hierarchy compared to inverted hierarchy for the left-handed neutrino
masses.


title: Higgs-gauge boson interactions in the economical 3-3-1 model

abstract:
  Interactions among the standard model gauge bosons and scalar fields in the
framework of SU(3)_C X SU(3)_L X U(1)_X gauge model with minimal (economical)
Higgs content are presented. From these couplings, all scalar fields including
the neutral scalar $h$ and the Goldstone bosons can be identified and their
couplings with the usual gauge bosons such as the photon, the charged $W^\pm$
and the neutral $Z$, without any additional condition, are recovered. In the
effective approximation, full content of scalar sector can be recognized. The
CP-odd part of Goldstone associated with the neutral non-Hermitian bilepton
gauge boson $G_{X^0}$ is decouple, while its CP-even counterpart has the mixing
by the same way in the gauge boson sector. Masses of the new neutral Higgs
boson $H^0_1$ and the neutral non-Hermitian bilepton $X^0$ are dependent on a
coefficient of Higgs self-coupling ($\lambda_1$). Similarly, masses of the
singly-charged Higgs boson $H_2^\pm$ and of the charged bilepton $Y^\pm$ are
proportional through a coefficient of Higgs self-interaction ($\lambda_4$). The
hadronic cross section for production of this Higgs boson at the LHC in the
effective vector boson approximation is calculated. Numerical evaluation shows
that the cross section can exceed 260 $fb$.


title:
Superradiance and subradiance in the electromagnetic radiative decay of
  X(3872)

abstract:
  It is pointed out that if the molecular interpretation of the recently
observed resonance X(3872) is valid, then nature may have prepared a good
laboratory for us to examine the phenomenon of superradiance and subradiance of
Dicke. The superradiance and supradiance factors are evaluated and the effects
on the electromagnetic radiative decay of X(3872) are discussed. Our results
using coordinate space representation is similar to the momentum space results
of Voloshin.


title:
From In-In to Pb-Pb collisions: Lessons from high-precision Dilepton
  Measurements

abstract:
  The NA60 experiment has studied low mass muon pair production in In-In
collisions at 158 AGeV with unprecedented precision. With these measurements
one can constrain the in-medium modifications of hadrons embedded in nuclear
matter more thoroughly than from previous experiments. In the present paper we
argue that these constraints could be significantly further tightened and
theoretical uncertainties in modeling of the medium evolution reduced by an
additional experiment measuring low mass di-muon production in Pb-Pb collisions
at 158 AGeV with the same resolution as provided by NA60 for the In-In system.


title:
The Elements of the Neutrino Mass Matrix: Allowed Ranges and
  Implications of Texture Zeros

abstract:
  We study the range of the elements of the neutrino mass matrix m_nu in the
charged lepton basis. Neutrino-less double beta decay is sensitive to the ee
element of m_nu. We then analyze the phenomenological implications of single
texture zeros. In particular, interesting predictions for the effective mass
can be obtained, in the sense that typically only little cancellation due to
the Majorana phases is expected. Some cases imply constraints on the
atmospheric neutrino mixing angle.


title: Hadronic Higgs Production with Heavy Quarks at the Tevatron and the LHC

abstract:
  We review the status of the QCD corrected cross sections and kinematic
distributions for the production of a Higgs boson in association with top quark
or bottom quark pairs at the Fermilab Tevatron and at the LHC. Results for
b-bbar-H production are presented in the Minimal Supersymmetric Model, where
the rates can be greatly enhanced relative to the Standard Model rates. We
place particular emphasis on theoretical uncertainties due to renormalization
and factorization scale dependence and on the uncertainties coming from the
Parton Distribution Functions.


title: Two-photon width of eta_c and eta'_c from Heavy-Quark Spin Symmetry

abstract:
  We evaluate the two-photon width of the pseudoscalar charmonia, Gamma(eta_c
-> gamma gamma) and Gamma(eta'_c -> gamma gamma), within a Heavy-Quark
Spin-Symmetry setting and show that whereas the former agrees with experiment,
the latter is more than twice larger than the recent measurement by CLEO. When
binding-energy effects are included in the eta'_c case, the discrepancy is
worse, pointing out at a possible anomaly in the eta'_c decay.


title:
Upper bounds on SUSY contributions to b to s transitions from B_s -
  B_sbar mixing

abstract:
  We study the constraints on supersymmetric contributions to b to s
transitions from the recent allowed range and measurement of Bs-Bsbar mixing
obtained by the D0 and CDF collaborations at the Tevatron. We compute the upper
bounds on the relevant off-diagonal squark mass terms and compare them with the
bounds coming from Delta F=1 decays. We find that the constraints on
chirality-flipping mass insertions are unaffected. Conversely, the measurement
of Bs-Bsbar mixing is effective in constraining chirality-conserving mass
insertions, and it has striking effects in the case in which left- and
right-handed insertions have similar size. Finally, we discuss the phase of the
Bs-Bsbar mixing amplitude in the presence of SUSY contributions.


title:
Impact of Delta mB_s on the determination of the unitary triangle and
  bounds on physics beyond the Standard Model

abstract:
  We study the impact on the unitarity triangle of the Bs-bar{Bs} flavor
oscillation data analyses being carried out at the Tevatron Run II. In the
current version of this work we consider the first direct experimental bound on
the mass difference Delta mB_s recently reported by DO along with the first
measurement achieved by CDF, Delta mB_s=(17.33 + - 0.4) ps^{-1}. In particular
we show how these measurements further constrain the compatibility between the
experimental value of sin(2beta)^{exp.}=(0.591,0.783) at 99% C.L. and the value
obtained by the fit of the CKM parameters considering just CP conserving
experimental observables: sin(2beta)^{CP-conserv.}=(0.742,0.856) at 99% C.L. We
also obtain bounds on certain classes of processes beyond the SM.


title: Twisted Flavors and Tri/bi-Maximal Neutrino Mixing

abstract:
  A new framework for handling flavor symmetry breaking in the neutrino sector
is discussed where the source of symmetry breaking is traced to the global
property of right-handed neutrinos in extra-dimensional space. Light neutrino
phenomenology has rich and robust predictions such as the tri/bi-maximal form
of generation mixing, controlled mass spectrum, and no need of flavor mixing
couplings in the theory.


title: Study on Strong Decays of $D_{sJ}(2632)$

abstract:
  The resonance $D_{sJ}(2632)$ observed by SELEX, has attracted great interests
and meanwhile brought up serious dispute. Its spin-parity, so far has not
finally determined and if it exists, its quark-structure might be exotic.
Following the previous literature where $D_{sJ}(2632)$ is assumed to be a
radial-excited state of $1^-$, we consider the possibilities that it might be a
$q\bar q$ ground state of $2^+$ or the first radial-excited state of $0^+$
$D_{sJ}(2317)$ and re-calculate its strong decay widths in terms of the
Bethe-Salpeter equation. Our results indicate that there still is a sharp
discrepancy between the theoretical evaluation and data.


title: Neutrino Mass and New Physics

abstract:
  We review the present state of and future outlook for our understanding of
neutrino masses and mixings. We discuss what we think are the most important
perspectives on the plausible and natural scenarios for neutrinos and what may
have the most promise to throw light on the flavor problem of quarks and
leptons. We focus on the seesaw mechanism which fits into the big picture of
particle physics such as supersymmetry and grand unification providing a
unified approach to flavor problem of quarks and leptons. We argue that in
combination with family symmetries, this may be at the heart of a unified
understanding of flavor puzzle. We also discuss other new physics ideas such as
neutrinos in models with extra dimensions and possible theoretical implications
of sterile neutrinos. We outline some tests for the various schemes.


title: 5D seesaw, flavor structure, and mass textures

abstract:
  In the 5D theory in which only 3 generation right-handed neutrinos are in the
bulk, the neutrino flavor mixings and the mass spectrum can be constructed
through the seesaw mechanism. The 5D seesaw is easily calculated just by a
replacement of the
  Majorana mass eigenvalues, M_i, by 2 M_*tan(h)[\pi RM_i] (M_*: 5D Planck
scale,
  R: compactification radius). The 5D features appear when the bulk mass, which
induces the 4D Majorana mass, is the same as the compactification scale or
larger than it. Depending on the type of bulk mass, the seesaw scales of the 3
generations are strongly split (the tan-function case) or degenerate (the
tanh-function case). In the split case, the seesaw enhancement is naturally
realized. The single right-handed neutrino dominance works in a simple setup,
and some specific mass textures, which are just assumptions in the 4D setup,
can be naturally obtained in
  5 dimensions. The degenerate case is also useful for a suitable neutrino
flavor structure.


title:
B\to X_s\gamma, X_s l^+ l^- decays and constraints on the mass insertion
  parameters in the MSSM

abstract:
  In this paper, we study the upper bounds on the mass insertion parameters
$(\delta^{q}_{AB})_{ij}$ in the minimal supersymmetric standard model (MSSM).
We found that the information from the measured branching ratio of $B \to X_s
l^+ l^-$ decay can help us to improve the upper bounds on the mass insertions
parameters $\left (\delta^{u,d}_{AB})_{3j,i3}$. Some regions allowed by the
data of $Br(B \to X_s \gamma) $ are excluded by the requirement of a SM-like
$C_{7\gamma}(m_b)$ imposed by the data of $Br(B \to X_s l^+ l^-)$.


title:
Two-Loop Vertices in Quantum Field Theory: Infrared and Collinear
  Divergent Configurations

abstract:
  A comprehensive study is performed of two-loop Feynman diagrams with three
external legs which, due to the exchange of massless gauge-bosons, give raise
to infrared and collinear divergencies. Their relevance in assembling realistic
computations of next-to-next-to-leading corrections to physical observables is
emphasised. A classification of infrared singular configurations, based on
solutions of Landau equations, is introduced. Algorithms for the numerical
evaluation of the residues of the infrared poles and of the infrared finite
parts of diagrams are introduced and discussed within the scheme of dimensional
regularization. Integral representations of Feynman diagrams which form a
generalization of Nielsen - Goncharov polylogarithms are introduced and their
numerical evaluation discussed. Numerical results are shown for all different
families of multi-scale, two-loop, three-point infrared divergent diagrams and
successful comparisons with analytical results, whenever available, are
performed. Part of these results has already been included in a recent
evaluation of electroweak pseudo-observables at the two-loop level.


title:
Electric properties of the baryon anti-decuplet in the SU(3) chiral
  quark-soliton model

abstract:
  We investigate the electric form factors and charge radii of the pentaquark
baryons within the framework of the chiral quark-soliton model. We consider the
rotational $1/N_c$ and linear $m_s$ corrections, assuming isospin symmetry and
employing the symmetry-conserving quantization. The flavor-decomposed charge
densities of the $\Theta^+$ are presented. The electric form factors and charge
radii of the charged pentaquark baryons turn out to be very similar to those of
the corresponding octet baryons. The charge radii of the neutral pentaquark
baryons are obtained to be very tiny and positive. The strange electric form
factor of the pentaquark proton is shown to be larger than the corresponding
one of the proton by around 20%. We also present the charge radii of the baryon
decuplet for comparison.


title: Right-Handed Sector Leptogenesis

abstract:
  Instead of creating the observed baryon asymmetry of the universe by the
decay of right-handed (RH) neutrinos to left-handed leptons, we propose to
generate it dominantly by the decay of the RH neutrinos to RH leptons. This
mechanism turns out to be successful in large regions of parameter space. It
may work, in particular, at a scale as low as $\sim$~TeV, with no need to
invoke quasi-degenerate RH neutrino masses to resonantly enhance the asymmetry.
Such a possibility can be probed experimentally by the observation at colliders
of a singlet charged Higgs particle and of RH neutrinos. Other mechanisms which
may lead to successful leptogenesis from the RH lepton sector interactions are
also briefly presented. The incorporation of these scenarios in left-right
symmetric and unified models is discussed.


title: Event generators for top quark production and decays

abstract:
  This contribution provides brief descriptions the current status of the basic
Monte Carlo event generators for top-quark production and decays.


title: Condensation of a Classical Scalar Field After Inflation and Dark Energy

abstract:
  In cosmological context, classical scalar fields are important ingredients
for inflation models, many candidate models of dark energy, symmetry breaking
and phase transition epochs, and their consequences such as baryo and
lepto-genesis. We investigate the formation of these fields by studying the
production of a light quantum scalar field during the decay of a heavy
particle. For simplicity it is assumed to be a scalar too. We discuss the
effects of the decay mode, the thermodynamical state of the decaying field,
boundary conditions, and related physical parameters on the production and
evolution of a condensate. For a simplified version of this model we calculate
the asymptotic behaviour of the condensate and conditions for its contribution
to the dark energy with an equation of state close to a cosmological constant.
We also discus the role of the back-reaction from interactions with other
fields and expansion of the Universe on the evolution of the condensate.


title:
Tests of Two-Body Dirac Equation Wave Functions in the Decays of
  Quarkonium and Positronium into Two Photons

abstract:
  Two-Body Dirac equations of constraint dynamics provide a covariant framework
to investigate the problem of highly relativistic quarks in meson bound states.
This formalism eliminates automatically the problems of relative time and
energy, leading to a covariant three dimensional formalism with the same number
of degrees of freedom as appears in the corresponding nonrelativistic problem.
It provides bound state wave equations with the simplicity of the
nonrelativistic Schroedinger equation. Here we begin important tests of the
relativistic sixteen component wave function solutions obtained in a recent
work on meson spectroscopy, extending a method developed previously for
positronium decay into two photons. Preliminary to this we examine the
positronium decay in the 3P_{0,2} states as well as the 1S_0. The two-gamma
quarkonium decays that we investigate are for the \eta_{c}, \eta_{c}^{\prime},
\chi_{c0}, \chi_{c2}, \pi^{0}, \pi_{2}, a_{2}, and f_{2}^{\prime} mesons. Our
results for the four charmonium states compare well with those from other quark
models and show the particular importance of including all components of the
wave function as well as strong and CM energy dependent potential effects on
the norm and amplitude. The results for the \pi^{0}, although off the
experimental rate by 15%, is much closer than the usual expectations from a
potential model. We conclude that the Two-Body Dirac equations lead to wave
functions which provide good descriptions of the two-gamma decay amplitude and
can be used with some confidence for other purposes.


title: Occupation number formalism for arbitrary Nc baryons

abstract:
  A general method is presented for computing matrix elements of quark
operators on baryonic states with low strangeness and arbitrary number of
colors Nc. These results are useful in applications of the large Nc expansion
to baryons and exotics. As an application we compute the matrix elements of
strangeness changing operators contributing to kaon couplings to ground state
baryons and pentaquarks, in broken SU(3).


title:
Detection of SUSY in the Stau-Neutralino Coannihilation Region at the
  LHC

abstract:
  We study the feasibility of detecting the stau neutralino
(stau_1-neutralino_1)coannihilation region at the LHC using tau leptons. The
signal is characterized by multiple low energy tau leptons from
neutralino_2-->tau stau_1-->tau tau neutralino_1 decays, where the stau_1 and
neutralino_1 mass difference (Delta M) is constrained to be 5-15 GeV by current
experimental bounds including the bound on the amount of neutralino cold dark
matter. Within the framework of minimal supergravity models, we show that if
hadronically decaying tau's can be identified with 50% efficiency for visible
pt >20 GeV the observation of such signals is possible in the final state of
two tau leptons plus large missing energy and two jets. With a gluino mass of
830 GeV the signal can be observed with as few as 3-10 fb^-1 of data (depending
on the size of Delta M). Using a mass measurement of the tau pairs with 10
fb^-1 we can determine dM with a statistical uncertainty of 12% for Delta M =
10 GeV and an additional systematic uncertainty of 14% if the gluino mass has
an uncertainty of 5%.


title: Systematic Study Of Leptonic Mixing In A Class Of SU_H(2) Models

abstract:
  We perform a systematic analysis of the PMNS matrices which arise when one
assigns the three generations of leptons to the $2\oplus 1$ representation of a
horizontal $SU_H(2)$ symmetry. This idea has been previously explored by
Kuchimanchi and Mohapatra. However, we assume $(i)$ the neutrino mass matrix
results from leptonic couplings to $SU_L(2)$ triplet scalar fields and $(ii)$
hierarchies exist amongst lepton mass matrix elements which result from
couplings to scalar fields with different $SU_H(2)$ charges. Of the sixteen
candidate PMNS matrices which result it is found that only one is both
predictive and possesses a leading order structure compatible with experimental
data. The relevant neutrino mass matrix displays the symmetry
$L_e-L_\mu-L_\tau$ to leading order and we explore the perturbations required
to produce a realistic lepton spectrum. The effective mass in neutrinoless
double beta decay is required to lie in the range
$<m>/(10^{-2}\mathrm{eV})\in[0.7,2.5]$, which is just below current
experimental bounds. $U_{e3}$ is non-zero but not uniquely determined.


title: pi pi scattering in a nonlocal Nambu -- Jona-Lasinio model

abstract:
  We consider a nonlocal version of the Nambu and Jona-Lasinio model. The
nonlocality is contained in the quark-antiquark bilinears of the four-quark
vertices as a form factor of the Gaussian type. The model has three parameters
which can be fixed in favour of the values of the pion mass, the pion decay
constant f_pi, and the current quark mass. The pi pi scattering amplitude is
obtained by calculating the quark box and the sigma-pole diagrams, where sigma
is the scalar isoscalar meson. It is shown that this amplitude satisfies the
well-known Weinberg relation. We obtain the s, p, d wave scattering lengths in
all isotopic channels and the s wave slope parameters. The results are in
satisfactory agreement with both phenomenological data and the basic
requirements of low-energy theorems, thus supporting to the form factor used.


title:
Contributions from flavour changing effective operators to the physics
  of the top quark at LHC

abstract:
  We consider all relevant dimension six operators to perform a model
independent analysis of flavour changing single top production at the LHC.


title:
The structure function method applied to polarized and unpolarized
  electron-proton scattering: a solution of the G_E(p)/G_M(p) discrepancy

abstract:
  The cross section for polarized and unpolarized electron-proton scattering is
calculated taking into account radiative corrections in leading and next-to
leading logarithmic approximation. The expression of the cross section is
formally similar to the cross section of the Drell-Yan process, where the
structure functions of the electron play the role of Drell-Yan probability
distributions. The interference of the Born amplitude with the two photon
exchange amplitude (box-type diagrams) is expressed as a contribution to
K-factor and it is larger when the momentum is equally shared between the two
photons, assuming that proton form factors decrease rapidly with the momentum
transfer squared. The calculation of the box amplitude is done when the
intermediate state is a proton or the Delta-resonance. The results of numerical
estimations show that the present calculation of radiative corrections can
bring into agreement the conflicting experimental results on proton
electromagnetic form factors an that the two photon contribution is very small.


title: The two-loop vector form factor in the Sudakov limit

abstract:
  Recently two-loop electroweak corrections to the neutral current four-fermion
processes at high energies have been presented. The basic ingredient of this
calculation is the evaluation of the two-loop corrections to the Abelian vector
form factor in a spontaneously broken SU(2) gauge model. Whereas the final
result and the derivation of the four-fermion cross sections from evolution
equations have been published earlier, the calculation of the form factor from
the two-loop Feynman diagrams is presented for the first time in this paper. We
describe in detail the individual contributions to the form factor and their
calculation with the help of the expansion by regions method and Mellin-Barnes
representations.


title: On the Strangeness -1 S-wave Meson-Baryon Scattering

abstract:
  We consider meson-baryon interactions in S-wave with strangeness -1. This is
a non-perturbative sector populated by plenty of resonances interacting in
several two-body coupled channels.We study this sector combining a large set of
experimental data. The recent experiments are remarkably accurate demanding a
sound theoretical description to account for all the data. We employ unitary
chiral perturbation theory up to and including \cal{O}(p^2) to accomplish this
aim. The spectroscopy of our solutions is studied within this approach,
discussing the rise from the pole content of the two \Lambda(1405) resonances
and of the \Lambda(1670), \Lambda(1800), \Sigma(1480), \Sigma(1620) and
\Sigma(1750). We finally argue about our preferred solution.


title: Evidence for infrared finite coupling in Sudakov resummation

abstract:
  New arguments are presented in favor of the infrared finite coupling approach
to power corrections in the context of Sudakov resummation. The more regular
infrared behavior of some peculiar combinations of Sudakov anomalous
dimensions, free of Landau singularities at large Nf, is pointed out. A general
conflict between the infrared finite coupling and infrared renormalon
approaches to power corrections is explained, and a possible resolution is
proposed, which makes use of the arbitrariness of the choice of constant terms
in the Sudakov exponent. A simple ansatz for a `universal' non-perturbative
Sudakov effective coupling at large Nf emerges naturally from these
considerations. An alternative evidence for an infrared finite {\em
perturbative} effective coupling in the Drell-Yan process at large Nf (albeit
at odds with the infrared renormalon argument) is found within the framework of
Sudakov resummation for eikonal cross sections of Laenen, Sterman and
Vogelsang.


title:
On B_s -> mu+ mu- and Cold Dark Matter Scattering in the MSSM with
  Non-Universal Higgs Masses

abstract:
  We show that present experimental constraints on B_s -> mu+ mu- decay and the
CDMS upper limit on the cold dark matter elastic scattering cross section
already have significant impact on the parameter space of the minimal
supersymmetric extension of the Standard Model (MSSM) with non-universal
supersymmetry-breaking scalar masses for the Higgs multiplets (NUHM). The
relaxation of scalar universality in the MSSM allows the possibility of a
relatively light mass M_A for the pseudoscalar Higgs boson. The present upper
limit on B_s -> mu+ mu- already excludes much of the scope for this possibility
in the NUHM, in contrast to the constrained MSSM with universal scalar masses
(CMSSM), where B_s -> mu+ mu- decay does not exclude any ranges of parameters
not already excluded by b -> s \gamma decay. Cold dark matter scattering is
also enhanced for small M_A, but the impact of present upper limit on B_s ->
mu+ mu- on the NUHM parameter space is in many cases greater than that of the
CDMS scattering limit, particularly at large tanb.


title:
Unusual High-Energy Phenomenology of Lorentz-Invariant Noncommutative
  Field Theories

abstract:
  It has been suggested that one may construct a Lorentz-invariant
noncommutative field theory by extending the coordinate algebra to additional,
fictitious coordinates that transform nontrivially under the Lorentz group.
Integration over these coordinates in the action produces a four-dimensional
effective theory with Lorentz invariance intact. Previous applications of this
approach, in particular to a specific construction of noncommutative QED, have
been studied only in a low-momentum approximation. Here we discuss
Lorentz-invariant field theories in which the relevant physics can be studied
without requiring an expansion in the inverse scale of noncommutativity.
Qualitatively, we find that tree-level scattering cross sections are
dramatically suppressed as the center-of-mass energy exceeds the scale of
noncommutativity, that cross sections that are isotropic in the commutative
limit can develop a pronounced angular dependence, and that nonrelativistic
potentials (for example, the Coloumb potential) become nonsingular at the
origin. We consider a number of processes in noncommutative QED that may be
studied at a future linear collider. We also give an example of scattering via
a four-fermion operator in which the noncommutative modifications of the
interaction can unitarize the tree-level amplitude, without requiring any other
new physics in the ultraviolet.


title: Limits on Lorentz Violation from Synchrotron and Inverse Compton Sources

abstract:
  We derive new bounds on Lorentz violations in the electron sector from
existing data on high-energy astrophysical sources. Synchrotron and inverse
Compton data give precisely complementary constraints. The best bound on a
specific combination of electron Lorentz-violating coefficients is at the 6 x
10^(-20) level, and independent bounds are available for all the
Lorentz-violating c coefficients at the 2 x 10^(-14) level or better. This
represents an improvement in some bounds by fourteen orders of magnitude.


title: Radiative decays of Bc mesons in a Bethe-Salpeter model

abstract:
  We evaluate the complete spectrum of the Bc mesons, below the open flavor BD
threshold, in a Bethe-Salpeter model. We make predictions for the radiative
decay widths of the Bc excited states. We compare our results with those of
other models.


title:
Toward a NNLO calculation of the B-->X_s+gamma decay rate with a cut on
  photon energy: II. Two-loop result for the jet function

abstract:
  The complete two-loop expression for the jet function J(p^2,mu) of
soft-collinear effective theory is presented, including non-logarithmic terms.
Combined with our previous calculation of the soft function S(omega,mu), this
result provides the basis for a calculation of the effect of a photon-energy
cut in the measurement of the B-->X_s+gamma decay rate at
next-to-next-to-leading order in renormalization-group improved perturbation
theory. The jet function is also relevant to the resummation of Sudakov
logarithms in other hard QCD processes.