title: Low-Energy Predictions of Lopsided Family Charges

abstract:
  We consider the Froggatt-Nielsen (FN) mechanism reproducing the observed mass
hierarchies and mixing angles for quarks and leptons. The large $\nu_\mu $-$
\nu_\tau$ mixing suggested from recent Superkamiokande experiments on the
atmospheric neutrinos implies lopsided FN U(1) charges for the lepton doublets.
There are two possible charge assignments to generate the large $\nu_\mu$-$
\nu_\tau$ mixing. We point out that the two models with different charge
assignments have distinct low-energy predictions and hence they are
distinguishable in future neutrino experiments on such as CP violation and
$2\beta 0\nu$ decay.


title: pi(-)p atom in ChPT: strong energy-level shift

abstract:
  The general formula of the pi(-)p atom strong energy-level shift in the 1s
state is derived in the next-to-leading order in the isospin breaking, and in
all orders in chiral expansion. Isospin-breaking corrections to the level shift
are explicitly evaluated at order p^2 in ChPT. The results clearly demonstrate
the necessity to critically reaccess the values of the piN scattering lengths,
extracted from the energy-level shift measurement by means of the potential
model-based theoretical analysis.


title: Effective theories and hadronic bound states

abstract:
  Recent progress in the description of the properties of hadronic atoms on the
basis of non-relativistic effective Lagrangian approach and Chiral Perturbation
Theory (ChPT) is reported. For the case of the pi(+)pi(-) atom decay, the
problem is completely solved, both conceptually and numerically. For the pi(-)p
atom, a general expression for the ground-state energy is obtained in the first
non-leading order in isospin breaking, and the numerical analysis is carried
out at O(p^2) in ChPT. We briefly consider a possible solution of the
"potential model puzzle" in the hadronic atom problem, providing a constructive
algorithm for the derivation of the isospin-breaking part of the short-range
hadronic potential from field theory.


title: Problems with the Casimir Vacuum Energy

abstract:
  A critical look is taken at the calculation of the Casimir effect. The
boundary conditions play an important role and should be imposed in a physical
way. An acceptable result for the vacuum energy is only obtained when different
regularization schemes yield the same result. Radiative corrections to the
Casimir force between two parallel plates due to electromagnetic vacuum
fluctuations have been obtained both in full QED and in a low-energy, effective
field theory with conflicting results. Including surface terms in the effective
Lagrangian, the QED result can be understood. Finally, a problem with the
electromagnetic vacuum energy on $S^3$ is pointed out and a solution suggested.
The structure of higher order corrections to this result is discussed.


title: Bounds on Heavy-to-Heavy Weak Decay Form Factors

abstract:
  We provide upper and lower bounds on the semileptonic weak decay form factors
for $B \to D^(*)$ and $\Lambda_b \to \Lambda_c$ decays by utilizing inclusive
heavy quark effective theory sum rules. These bounds are calculated to second
order in $\Lambda_{QCD}/m_Q$ and first order in $\alpha_s$. The $O(\alpha_s^2
\beta_0)$ corrections to the bounds at zero recoil are also presented.


title:
Analysis of $B \to K\pi$ decays with small elastic final state
  interactions

abstract:
  An analysis of $B \to K\pi$ decays is given, assuming a small elastic $\pi K
$ rescattering phase difference.Using factorization model only for the
tree-level and electroweak penguin amplitudes, we show that the strong penguin
amplitude, its absorptive part and the CP-violation weak phase $\gamma$ can be
obtained from the measured $B \to K\pi$ branching ratios. The strength of the
strong penguin and its absorptive part thus obtained from the CLEO data, are
found to be very close to factorization model values and suggests a current $s$
quark mass around $m_{s} = 106 \rm MeV$. The central value of $\gamma$ is found
to be around $76.10^{\circ}$, with a possible value in the range
$50^{\circ}-100^{\circ}$.


title:
Effects of the Scale-dependent Vacuum Expectation Values in the
  Renormalization Group Analysis of Neutrino Masses

abstract:
  The contribution of scale-dependent vacuum expectation values (VEVs) of Higgs
scalars, which gives significant effects in the evolution of fundamental
fermion masses in the Minimal Supersymmetric Standard Model (MSSM), is now
considered in the derivation of the one-loop analytic expression for the
evolution of the left-handed Majorana neutrino masses with energies. The
inclusion of such effect of the running VEV increases the stability of the
neutrino masses under quantum corrections and leads to a mild decrease of
neutrino masses with higher energies.


title: CP-Violating MSSM Higgs Bosons in the Light of LEP 2

abstract:
  In the MSSM, the CP parities of the neutral Higgs bosons may be mixed by
radiative effects induced by explicit CP violation in the third generation of
squarks. To allow for this possibility, we argue that the charged Higgs-boson
mass and tan(beta) should be used to parametrize the MSSM Higgs sector. We
introduce a new benchmark scenario of maximal CP violation appropriate for
direct searches of CP-violating MSSM Higgs bosons. We show that the bounds
established by LEP 2 on the MSSM Higgs sector may be substantially relaxed at
low and intermediate values of tan(beta) in the presence of CP violation, and
comment on possible Higgs boson signatures at LEP 2 within this framework.


title: A Higgs or Not a Higgs?

abstract:
  This talk summarizes a method for analyzing the properties of any new scalar
particle, which is systematic in the sense that it minimizes apriori
theoretical assumptions about the properties of the scalar particle, leading to
very model-independent results. This kind of analysis lends itself to
systematic survey through the terrain of candidate theories, which we find has
vast unpopulated areas. It is also useful for quantifying the comparison of the
goodness of fit of competing descriptions of data, should a new scalar be
found.


title: The shape function in field theory

abstract:
  The shape function describes (non-perturbative) Fermi motion effects in
semi-inclusive heavy flavour decay. Its renormalization properties are
substantially dependent on the kind of ultraviolet regulator used. For example,
the double logarithm that appears at one loop is larger by a factor 2 in
dimensional regularization than in lattice regularization. We show that
factorization of long-distance effects inside the shape function is achieved
with any regulator considered.


title:
Enhanced photon production from quark-gluon plasma: Finite-lifetime
  effect

abstract:
  Photon production from a thermalized quark-gluon plasma of finite lifetime is
studied directly in real time with a nonequilibrium formulation that includes
off-shell (energy nonconserving) effects. To lowest order we find that
production of direct photons form a quark-gluon plasma of temperature T ~ 200
MeV and lifetime t ~ 10-20 fm/c is strongly enhanced by off-shell (anti)quark
bremsstrahlung q(\bar{q})->q(\bar{q})\gamma. The yield from this nonequilibrium
finite-lifetime effect dominates over those obtained from higher order
equilibrium rate calculations in the range of energy E > 2 GeV and falls off
with a power law for E >> T.


title: Dileptons from $\eta_c$ in Nucleus-Nucleus collisions

abstract:
  Preliminary estimates suggest that excess dimuon production with invariant
mass in the range 1.5 -- 2.5 GeV in nucleus-nucleus collisions can be explained
on the basis of $\eta_c$ production. This appears to be consistent with all the
peripheral and central collision data with various nuclei such as S-U at 200
GeV/nucleon except for the central collision data on Pb-Pb at 158 GeV/nucleon.
Some explanations based on glueball production for Pb-Pb data are discussed.


title: A manifestation of a gluon saturation in e-A DIS

abstract:
  This is a short presentation of our talks given at eRHIC Workshop at the BNL.
We give here a status report of our attempts to understand how gluon saturation
will manifest itself in deep inelastic scattering with nuclei. This summary
reflects our current understanding and shows directions of our research rather
then a final answer to the question. Nevertheless, we are able to share with
our reader our tentative answer to the question:``Why do we need to measure DIS
with nuclei and why these data will be complementary to the information
obtained from proton DIS".


title:
Analytical calculation of heavy baryon correlators in NLO of
  perturbative QCD

abstract:
  We present analytical next-to-leading order results for the correlator of
baryonic currents at the three-loop level with one finite mass quark. We obtain
the massless and the HQET limits of the correlator as particular cases from the
general formula, we also give explicit expressions for the moments of the
spectral density. Calculations have been performed with an extensive use of the
symbolic manipulation programs MATHEMATICA and REDUCE.


title:
What the Infrared Behavior of QCD Green Functions can tell us about
  Confinement in the Covariant Gauge

abstract:
  We review aspects of confinement in the covariant and local description of
QCD and discuss to what extend our present knowledge of the infrared behavior
of QCD Green functions can support this description. In particular, we
emphasize: the positivity violations of transverse gluon and quark states, the
Kugo-Ojima confinement criterion, and the conditions necessary to avoid the
decomposition property for colored clusters. We summarize how these issues
relate to the infrared behavior of the propagators in Landau gauge QCD as
extracted from solutions to truncated Dyson-Schwinger equations and lattice
simulations.


title: What Can We Learn from Charmless Rare B Decays - the Past/Next 3 Years

abstract:
  A personal perspective is given on physics of charmless rare B decays: 1997
-- 2003.


title: Highlights of Cern Workshop on Charm Production in A+A Collisions

abstract:
  Models and experimental effort concerning open and hidden charm production in
nuclear collisions discussed at Cern Workshop in December 99 are reviewed. The
most recent development is also mentioned.


title:
Quantum Dissipative Effects and Neutrinos : current constraints and
  future perspectives

abstract:
  We establish the most stringent experimental constraints coming from recent
terrestrial neutrino experiments on quantum mechanical decoherence effects in
neutrino systems. Taking a completely phenomenological approach, we probe
vacuum oscillations plus quantum decoherence between two neutrino species in
the channels $\nu_\mu \to \nu_\tau$, $\nu_\mu \to \nu_e$ and $\nu_e \to
\nu_\tau$, admitting that the quantum decoherence parameter $\gamma$ is related
to the neutrino energy $E_\nu$ as : $\gamma=\gamma_0 (E_\nu/\text{GeV})^{n}$,
with $n=-1,0,1$ and 2. Our bounds are valid for a neutrino mass squared
difference compatible with the atmospheric, the solar and, in many cases, the
LSND scale. We also qualitatively discuss the perspectives of the future long
baseline neutrino experiments to further probe quantum dissipation.


title: Flavor Decomposition of Nucleon Structure at a Neutrino Factory

abstract:
  We explore the possibilities for measuring the quark content of the proton
and neutron using neutrino beams produced at a muon storage ring. Because of
the nature of the beams, small nuclear targets such as hydrogen and deuterium
can be considered, as well as polarized targets. The statistics expected from
these targets are calculated using nominal muon storage ring intensities, and
the resulting statistical errors on the numerous structure functions available
are given, for both polarized and unpolarized targets. It is shown that with a
relatively small target, the structure functions F_2, xF_3, xg_1 and xg_5 for
neutrinos and antineutrinos on protons and deuterium, either unpolarized or
polarized, could be determined with excellent precision over most of the
accessible kinematic range.


title:
Polarizations of J/\psi and \psi' in hadroproduction at Tevatron in the
  k_t factorization approach

abstract:
  We present a calculation for the polarizations of $J/\psi$ and $\psi'$
produced in the hadron collisions at the Fermilab Tevatron. Various color octet
channels including ${}^1S_0^{(8)}$, ${}^3P_J^{(8)}$, and ${}^3S_1^{(8)}$ as
well as contributions from $\chi_{cJ}$ decays are considered in the $k_t$
factorization approach. We find that in a rather wide range of the transverse
momenta of $J/\psi$ and $\psi'$, the production rates could be dominated by the
${}^1S_0^{(8)}$ channel, and the predicted polarizations from the
${}^1S_0^{(8)}$ channel and $\chi_{cJ}$ feeddown contributions are roughly
compatible with the preliminary CDF data. This might provide a possible release
from the conflict between the NRQCD collinear parton model calculations and the
CDF data.


title:
Non-topological solitons as nucleation sites for cosmological phase
  transitions

abstract:
  I consider quantum field theories that admit charged non-topological solitons
of the Q-ball type, and use the fact that in a first-order cosmological phase
transition, below the critical temperature, there is a value of the soliton
charge above which the soliton becomes unstable and expands, converting space
to the true vacuum, much like a critical bubble in the case of ordinary
tunneling. Using a simple model for the production rate of Q-balls through
charge accretion during a random walk out of equilibrium, I calculate the
probability for the formation of critical charge solitons and estimate the
amount of supercooling needed for the phase transition to be completed.


title: Like-sign dimuon charge asymmetry in the decay of B B-bar pairs

abstract:
  We discuss the CP-violating dimuon charge asymmetry of events p p-bar ---> B
B-bar X ---> mu mu X in the Standard Model. Our conclusion is that the
asymmetry is larger than previously expected and may reach a few percent for
the (B_d^0, B-bar_d^0) system. The analysis is also extended to the Two Higgs
Doublet Model (Model II).


title:
Supersymmetric Scaling Violations (I). Solving the Supersymmetric DGLAP
  Evolution

abstract:
  We analize the renormalization group equations of supersymmetric QCD with N=1
for the evolution of parton distributions. For this purpose we develope a
simple recursive algorithm in x-space to include both regular regions and
supersymmetric regions in the evolution in the step approximation.
Supersymmetric distributions are generated within a radiative model, with
vanishing initial conditions for the superpartners. Here we focus on a scenario
with broken susy, characterized by a lighter gluino coupled to the standard
evolution and a decoupled scalar quark. Predictions for the all the
distributions are presented.


title: The Light-Cone Fock Expansion in Quantum Chromodynamics

abstract:
  A fundamental question in QCD is the non-perturbative structure of hadrons at
the amplitude level--not just the single-particle flavor, momentum, and
helicity distributions of the quark constituents, but also the multi-quark,
gluonic, and hidden-color correlations intrinsic to hadronic and nuclear
wavefunctions. The light-cone Fock-state representation of QCD encodes the
properties of a hadrons in terms of frame-independent wavefunctions. A number
of applications are discussed, including semileptonic B decays, deeply virtual
Compton scattering, and dynamical higher twist effects in inclusive reactions.
A new type of jet production reaction, "self-resolving diffractive
interactions" can provide direct information on the light-cone wavefunctions of
hadrons in terms of their quark and gluon degrees of freedom as well as the
composition of nuclei in terms of their nucleon and mesonic degrees of freedom.
The relation of the intrinsic sea to the light-cone wavefunctions is discussed.
The physics of light-cone wavefunctions is illustrated for the quantum
fluctuations of an electron.


title: The Light-Cone Fock Representation in QCD

abstract:
  The light-cone Fock-state representation of QCD encodes the properties of a
hadrons in terms of frame-independent wavefunctions, providing a systematic
framework for evaluating structure functions, exclusive hadronic matrix
elements, including time-like heavy hadron decay amplitudes, form factors, and
deeply virtual Compton scattering. A new type of jet production reaction,
"self-resolving diffractive interactions" can provide direct information on the
light-cone wavefunctions of hadrons in terms of their quark and gluon degrees
of freedom as well as the composition of nuclei in terms of their nucleon and
mesonic degrees of freedom. The relation of the intrinsic sea to the light-cone
wavefunctions is discussed. The decomposition of light-cone spin is illustrated
for the quantum fluctuations of an electron.


title: Resonance Enhanced Tunneling

abstract:
  Time evolution of tunneling in thermal medium is examined using the real-time
semiclassical formalism previously developed. Effect of anharmonic terms in the
potential well is shown to give a new mechanism of resonance enhanced
tunneling. If the friction from environment is small enough, this mechanism may
give a very large enhancement for the tunneling rate. The case of the
asymmetric wine bottle potential is worked out in detail.


title:
Enhancement of the Higgs pair production at LHC; the MSSM and extra
  dimension effects

abstract:
  The neutral Higgs pair production at the LHC is studied in the MSSM, the
large extra dimensional (ADD) model and the Randall-Sundrum (RS) model, where
the total cross section can be significantly enhanced compared to that in the
SM. The $p_{_T}$, invariant mass and rapidity distributions of each model have
been shown to be distinctive: The ADD model raises the $p_T$ and invariant mass
distributions at high scales of $p_T$ and invariant mass; in the RS model
resonant peaks appear after the SM contribution dies away; the SM and the MSSM
distributions drop rapidly at those high scales; in the ADD and the RS models
the rapidity distributions congregate more around the center. It is concluded
that various distributions of the Higgs pair production at the LHC with
restrictive kinematic cuts would provide one of the most robust signals for the
extra dimensional effects.


title: Phenomenology of Radion in Randall-Sundrum Scenario

abstract:
  The success of the Randall-Sundrum scenario relies on stabilization of the
modulus field or the radion, which is the scalar field about the background
geometry. The stabilization mechanism proposed by Goldberger and Wise has the
consequence that this radion is lighter than the graviton Kaluza-Klein states
so that the first particle to be discovered is the radion. In this work, we
study in details the decay, production, and detection of the radion at
hadronic, $e^+ e^-$, and $\gamma\gamma$ colliders.


title: Universal features of fluctuations

abstract:
  Universal scaling laws of fluctuations (the $\Delta$-scaling laws) can be
derived for equilibrium and off-equilibrium systems when combined with the
finite-size scaling analysis. In any system in which the second-order critical
behavior can be identified, the relation between order parameter, criticality
and scaling law of fluctuations has been established and the relation between
the scaling function and the critical exponents has been found.


title: Hard Parton Rescatterings and Minijets in Nuclear Collisions at LHC

abstract:
  The average number of minijets and the corresponding transverse energy
produced in heavy ion collisions are evaluated by including explicitly
semi-hard parton rescatterings in the dynamics of the interaction. At the LHC
semi-hard rescatterings have a sizable effect on global characteristics of the
typical inelastic event. An interesting feature is that the dependence on the
cutoff which separates soft and hard parton interactions becomes less critical
after taking rescatterings into account.


title:
Rho Electroproduction and the Hadronic Contribution to Deeply Virtual
  Compton Scattering

abstract:
  A two-gluon-exchange model incorporating perturbative and non-perturbative
effects is presented for rho electroproduction which provides an excellent
description of all current data. This is then used to calculate the
contribution from the rho to deeply virtual Compton scattering via the
vector-meson-dominance transition rho -> gamma. This is found to be
sufficiently large to provide a significant contribution through interference
with the perturbative QCD term.


title: Proton decay in SO(10) SUSY GUTs

abstract:
  We calculate the proton lifetime in an SO(10) supersymmetric grand unified
theory [SUSY GUT] with U(2) family symmetry. This model fits the low energy
data, including the recent data for neutrino oscillations. We discuss the
predictions of this model for the proton lifetime in light of recent
SuperKamiokande results which significantly constrain the SUSY parameter space
of the model.


title: Bottom-up thermalization in heavy ion collisions

abstract:
  We describe how thermalization occurs in heavy ion collisions in the
framework of perturbative QCD. When the saturation scale $Q_s$ is large
compared to $\Lambda_{QCD}$, thermalization takes place during a time of order
$\alpha^{-13/5}Q_s^{-1}$ and the maximal temperature achieved is
$\alpha^{2/5}Q_s$.


title: Predictions for the Decays of Radially-Excited Baryons

abstract:
  We consider decays of the lowest-lying radially excited baryons. Assuming a
single-quark decay approximation, and negligible configuration mixing, we make
model-independent predictions for the partial decay widths to final states with
a single meson. Masses of unobserved states are predicted using an old mass
formula rederived using large-$N_c$ QCD. The momentum dependence of the
one-body decay amplitude is determined phenomenologically by fitting to
observed decays. Comparison of these predictions to experiment may shed light
on whether the Roper resonance can be interpreted as a three-quark state.


title: Dispersion analysis for generalized spin polarizabilities

abstract:
  We report on a dispersion relation formalism for the virtual Compton
scattering (VCS) reaction on the proton, which for the first time allows a
dispersive evaluation of 4 generalized polarizabilities. The dispersion
formalism provides a new tool to analyze VCS experiments above pion threshold,
thus increasing the sensitivity to the generalized polarizabilities of the
nucleon.


title: Asymptotic Space-Time Behavior of HTL Gauge Propagator

abstract:
  The asymptotic behavior as t\to\infty and r\to\infty of the hard-thermal-loop
propagator D^{\mu\nu}(t,r) is computed in the Coulomb gauge. The asymptotic
falloff is always a power law though generally different in the deep time-like
and space-like regions. The contributions of quasiparticle poles and Landau
branch cuts are computed. The most difficult calculation is the contribution of
the branch cut in the transverse propagator D^{ij}(t,r). For QED this produces
a leading behavior of order T/r in both the time-like and space-like regions.
The inclusion of a magnetic mass so as to describe QCD makes the leading
behavior 1/(Tr^{3}), thus improving the infrared convergence. The asymptotic
space-like behavior of all contributions (longitudinal and transverse, poles
and cuts) is confirmed by also computing in the Euclidean formalism and
analytically continuing. The results are compared will those for free gauge
bosons at finite temperature.


title:
Experimental Puzzles in Heavy Flavor Decays - Anomalously high $\eta'$
  appearance in charmless strange B decays - Flavor SU(3) breaking in Charm
  Decays

abstract:
  Simple experimental tests are proposed which can clarify the origin for the
anomalously high $\eta'$ appearance in charmless strange final states in $B$
decays and can investigate the the nature of SU(3) symmetry-breaking in weak
heavy flavor decays.


title: On the number of colours in Quantum Chromodynamics

abstract:
  It is commonly believed that ${\pi}^0 \to 2 \gamma$ decay shows that there
are three colours in Quantum Chromodynamics (QCD). It is shown here that this
is not correct. When correct colour dependent charges of the quarks are
considered then it is shown that this decay does not make any statement about
the number of colours in QCD.


title:
Extra Dimensions and Compositeness as a Basis for Hierarchy in Quark
  Mass Matrices

abstract:
  Strong gauge and top-Yukawa couplings predicted in the presence of extra
dimensions lead to a trickle-down effect of the top-coupling through the
renormalization group equations for the quark Yukawa matrices. The matrix
elements for the u and d-quarks get progressively smaller as one moves away
from the dominant (33)-element revealing a hierarchical pattern for the mass
matrices.


title: Analysis of the QCD-improved factorization in B -> J/\psi K

abstract:
  We consider the exclusive decay $B\to J/\psi K$ using the QCD-improved
factorization method in the heavy quark limit. It is shown that the decay
amplitude is factorizable in this limit and nonfactorizable contributions are
calculable from first principles in perturbation theory. Also the spectator
contributions at order $\alpha_s$ are finite and suppressed in the heavy quark
limit. We present the result at next-to-leading order in strong interaction,
and leading order in $1/m_b$ in the heavy quark limit.


title:
Radion effects on the production of an intermediate-mass scalar and Z at
  LEP II

abstract:
  We have studied the $e^+ e^- \to Z \phi_i \to Z jj$ process, where $\phi_i$
is the Higgs and/or radion bosons. The implications of the radion effects on
the preliminary ALEPH data are also discussed. The case of the lighter radion
than Higgs boson is disfavored by the ALEPH analyses of the $b$ tagged four-jet
data, since the radion predominantly decays into two gluon jets due to the QCD
trace anomaly. If the radion is highly degenerate in mass with the Higgs, the
cross section can be increased more than at one sigma level, with natural scale
of the vacuum expectation value of the radion.


title:
Centrality dependence of multiplicities in ultrarelativistic nuclear
  collisions

abstract:
  We compute the centrality dependence of multiplicities of particles produced
in ultrarelativistic nuclear collisions at various energies and atomic numbers.
The computation is carried out in perturbative QCD with saturated densities of
produced gluons and by including effects of nuclear geometry. Numbers are given
for Au+Au collisions at RHIC energies.


title: Testing LSND at long-baseline neutrino experiments

abstract:
  Recently it was suggested that two very different mass-squared differences
play a role in atmospheric neutrino oscillations. The larger of these also
accounts for the LSND result and the smaller of these also drives the solar
neutrino oscillations. We consider the predictions of this scheme for
long-baseline experiments. We find that high statistics experiments, such as
MINOS, can observe a clean signal for this scheme, which is clearly
distinguishable from the usual scheme of atmospheric neutrino oscillations
driven by a single mass-squared difference.


title: QCD dipole model and k_T factorization

abstract:
  It is shown that the colour dipole approach to hard scattering at high energy
is fully compatible with k_T factorization at the leading logarithm
approximation (in -log x_Bj). The relations between the dipole amplitudes and
unintegrated diagonal and non-diagonal gluon distributions are given. It is
also shown that including the exact gluon kinematics in the k_T factorization
formula destroys the conservation of transverse position vectors and thus is
incompatible with the dipole model for both elastic and diffractive amplitudes.


title: Recent Theoretical Developments in LEP 2 Physics

abstract:
  Recent theoretical developments in electron-positron annihilation into
fermion pairs are summarized. In particular, two-fermion production, DPA for WW
signal, single-W production and ZZ signal


title:
Quantization of eletric charge, the neutrino and generation
  nonuniversality

abstract:
  text of abstract It is showed that the eletric charge quantization is
unconnected to Majorana neutrino in the non-universal generations
leptoquark-bilepton flavordynamics which includes the right-handed neutrino and
an explicit U(1) factor in the gauge semisimple group.


title:
Constraints for the nuclear sea quark distributions from the Drell-Yan
  process at the SPS

abstract:
  Nuclear modifications to the Drell-Yan dilepton production cross sections in
p+A and A+A collisions in the leading twist approximation are caused by nuclear
effects in the parton distributions of bound nucleons. For non-isoscalar
nuclei, isospin corrections must also be considered. We calculate these effects
for p+A and Pb+Pb collisions at CERN SPS energies. Our goal is to place
constraints on nuclear effects in sea quark distributions in the region x >
0.2. We show that the net nuclear corrections remain small for p+A collisions
at E_lab=450 GeV. However, in Pb+Pb collisions at E_lab=158 AGeV, effects of >
20% are predicted at large M. The data collected by the NA50 collaboration
could thus be used to constrain the nuclear effects in the sea quark
distributions in the region of the EMC effect, x > 0.3.


title: \chi_{cJ} polarizations at the Fermilab Tevatron

abstract:
  We propose the measurement of $\chi_{cJ}$ polarizations at high energy hadron
colliders to study heavy quarkonium production mechanism. We find that the
color-singlet model in the $k_t$ factorization approach predicts very different
behavior for $\chi_{cJ}$ polarizations at the Fermilab Tevatron compared with
the NRQCD predictions in the collinear parton model. In the color-singlet $k_t$
factorization approach, for both $\chi_{c1}$ and $\chi_{c2}$ productions, the
helicity $h=0$ states dominate over other helicity states at large $p_T$. These
properties are very useful in distinguishing between the two production
mechanisms which are related to the interesting issue of $J\psi$ and $\psi'$
polarizations, and may provide a crucial test for the $k_t$ factorization
approach.


title: A Model of the Electroweak Interactions with Invisible Higgs Particle

abstract:
  We propose a minimal unified model of the electroweak interactions without a
Higgs particle in the final physical spectrum. This is achieved through adding
a nonlinear constraint for the Higgs field in the Lagrangian in which the
field's content is the same as in the Weinberg-Salam (WS) model. In the unitary
gauge the generation of masses of the $W^{\pm}$ and $Z$ bosons, as well as for
the leptons and quarks, reproduces the known pattern in the WS model. The path
integral quantization shows that with the exception of the scalar particles'
all other vertices, known from the WS model in the unitary gauge, remain. A
Ward identity relative to the electromagnetic gauge group is also derived.


title:
Light-Cone Wavefunction Representation of Deeply Virtual Compton
  Scattering

abstract:
  We give a complete representation of virtual Compton scattering $\gamma^* p
\to \gamma p$ at large initial photon virtuality $Q^2$ and small momentum
transfer squared $t$ in terms of the light-cone wavefunctions of the target
proton. We verify the identities between the skewed parton distributions
$H(x,\zeta,t)$ and $E(x,\zeta,t)$ which appear in deeply virtual Compton
scattering and the corresponding integrands of the Dirac and Pauli form factors
$F_1(t)$ and $F_2(t)$ and the gravitational form factors $A_{q}(t)$ and
$B_{q}(t)$ for each quark and anti-quark constituent. We illustrate the general
formalism for the case of deeply virtual Compton scattering on the quantum
fluctuations of a fermion in quantum electrodynamics at one loop.


title: The Overlap Representation of Skewed Quark and Gluon Distributions

abstract:
  Within the framework of light-cone quantisation we derive the complete and
exact overlap representation of skewed parton distributions for unpolarised and
polarised quarks and gluons. Symmetry properties and phenomenological
applications are discussed.


title:
Next-to-leading Order SUSY-QCD Calculation of Associated Production of
  Gauginos and Gluinos

abstract:
  Results are presented of a next-to-leading order calculation in perturbative
QCD of the production of charginos and neutralinos in association with gluinos
at hadron colliders. Predictions for cross sections are shown at the energies
of the Fermilab Tevatron and CERN Large Hadron Collider for a typical
supergravity (SUGRA) model of the sparticle mass spectrum and for a light
gluino model.


title: Constraints on the Proton's Gluon Density from Lepton-Pair Production

abstract:
  Massive lepton-pair production, the Drell-Yan process, should be a good
source of independent constraints on the gluon density, free from the
experimental and theoretical complications of photon isolation that beset
studies of prompt photon production. We provide predictions for the
spin-averaged and spin-dependent differential cross sections as a function of
transverse momentum $Q_T$.


title: Bottom and Charm Production at LHC and RHIC

abstract:
  We study $b\bar{b}$ and $c\bar{c}$ production and the influence of nuclear
shadowing at LHC and RHIC energies. We find a significant reduction in the
production cross section of both charm and bottom at RHIC and LHC. Bound states
such as $\Upsilon$ and $J/\Psi$ are suppressed by this reduction in the charm
production cross sections. Therefore, $J/\Psi$ suppression may not be useful as
a signature for the quark gluon plasma.


title:
The gamma -> 3 pi form factor as a constraint on Schwinger-Dyson
  modeling of light quarks

abstract:
  The form factor for gamma pi^+ -> pi^+ pi^0 was calculated in a simple-minded
constituent model with a constant quark mass parameter, as well as in the
Schwinger-Dyson approach. The comparative discussion of these and various other
theoretical results on this anomalous process, as well as the scarce already
available data (hopefully to be supplemented by more accurate CEBAF data soon),
seem to favor Schwinger-Dyson modeling which would yield relatively small
low-momentum values of the constituent (dynamically dressed) quark mass
function.


title: Skyrmion-anti-Skyrmion Annihilation with Omega Mesons

abstract:
  We study numerically the annihilation of an omega-stabilized Skyrmion and an
anti-Skyrmion in three spatial dimensions. To our knowledge this is a first
successful simulation of Skyrmion-anti-Skyrmion annihilation which follows
through to the point where the energy is carried by outgoing meson waves.
  We encounter instabilities similar to those encountered is earlier
calculations, but in our case these are not fatal and we are able to simulate
through this process with a global energy loss of less than 8%, and to identify
robust features of the final radiation pattern. The system passes through a
singular configuration at the time of half-annihilation. This is followed by
the onset of fast oscillations which are superimposed on the smoother process
which leads to the appearence of outgoing spherical waves.
  We investigate the two prominent features of this process, the proliferation
of small, fast oscillations, and the singular intermediate configuration. We
find that our equations of motion allow for a regime in which the amplitude of
certain small perturbations increases exponentially. This regime is similar but
not identical to the situation pointed out earlier regarding the original
Skyrme model. We argue that the singularity may be seen as the result of a
pinch effect similar to that encountered in plasmas.


title:
Eikonal propagators and high-energy parton-parton scattering in gauge
  theories

abstract:
  In this paper we consider soft high-energy parton-parton scattering processes
in gauge theories, i.e., elastic scattering processes involving partons at very
high squared energies in the center of mass and small squared transferred
momentum. By a direct resummation of perturbation theory in the limit we are
considering, we derive expressions for the truncated-connected quark
(antiquark) propagator in an external gluon field, as well as for the residue
at the pole of the full unrenormalized propagator, both for scalar and fermion
gauge theories. These are the basic ingredients to derive high-energy
parton-parton scattering amplitudes, using the LSZ reduction formulae and a
functional integral approach. The above procedure is also extended to include
the case in which at least one of the partons is a gluon. The meaning and the
validity of the results are discussed.


title: Anomalous Quartic Gauge Boson Couplings at Hadron Colliders

abstract:
  We analyze the potential of the Fermilab Tevatron and CERN Large Hadron
Collider (LHC) to study anomalous quartic vector--boson interactions (photon
photon Z Z) and (photon photon W+ W-). Working in the framework of SU(2)_L X
U(1)_Y chiral Lagrangians, we study the production of photons pairs accompanied
by (e+e-), (e nu), and jet pairs to impose bounds on these new couplings,
taking into account the unitarity constraints. We compare our findings with the
indirect limits coming from precision electroweak measurements as well as with
presently available direct searches at LEPII. We show that the Tevatron Run II
can provide limits on these quartic limits which are of the same order of
magnitude as the existing bounds from LEPII searches. LHC will be able to
tighten considerably the direct constraints on these possible new interactions,
leading to more stringent limits than the presently available indirect ones.


title: Dynamical Quark Effects in QCD on the Lattice - results from the CP-PACS

abstract:
  Results of a systematic lattice QCD simulation with two degenerate flavors of
sea quarks, identified as dynamical u and d quarks, are presented. The
simulation was performed on a dedicated parallel computer, called CP-PACS,
developed at the University of Tsukuba. Clear dynamical quark effects are
observed in the light hadron mass spectrum and in the light quark masses: In
the light hadron mass spectrum, major parts of the discrepancy between quenched
QCD and experiment are shown to be removed by introducing two flavors of
dynamical quarks. For the averaged mass of u and d quarks, we find
$m_{ud}^{\bar{\rm MS}}(2{\rm GeV}) = 3.44^{+0.14}_{-0.22}$ MeV using the $\pi$
and $\rho$ meson masses as physical input, and for the s quark mass, we obtain
$m_{s}^{\bar{\rm MS}}(2{\rm GeV}) = 88^{+4}_{-6}$ MeV or $90^{+5}_{-11}$ MeV
with the K or $\phi$ meson mass as additional input. These values are about
20-30% smaller than the previous estimates in the quenched approximation. We
also discuss the U(1) problem and B meson decay constants.


title:
Inclusive Quark Production in $e^{+}e^{-}$-Annihilation - A Path
  Integral Approach

abstract:
  The single-particle inclusive differential cross-section for a reaction
$a+b\to c+X$ is written as imaginary part of a correlation function in a
forward scattering amplitude for $a+b\to a+b$ in a modified effective theory.
In this modified theory the interaction Hamiltonian $\tilde H_I$ equals $H_I$
of the original theory up to a certain time. Then there is a sign change and
$\tilde H_I$ becomes nonlocal. This is worked out in detail for scalar field
models and for QED plus the abelian gluon model. A suitable path integral for
direct calculations of inclusive cross sections is presented.


title: Why the f(0)(980) is mostly ssbar

abstract:
  We exploit the W-emission process to study the measured weak decay of the
D(s,+)(1.9686) meson into f(0)(980) and a positively charged pion. We conclude
that the scalar f(0)(980) meson contains mostly strange-antistrange flavors,
which is supported by different model studies.


title:
Maximum lepton asymmetry from active-sterile neutrino oscillations in
  the Early Universe

abstract:
  A large lepton asymmetry could be generated in the Early Universe by
oscillations of active to sterile neutrinos with a small mixing angle sin 2
\theta < 10^-2. The final order of magnitude of the lepton asymmetry \eta is
mainly determined by its growth in the last stage of evolution when the MSW
resonance dominates the kinetic equations. In this paper we present a simple
way of calculating the maximum possible lepton asymmetry which can be created.
Our results are in good agreement to previous calculations. Furthermore, we
find that the growth of asymmetry does not obey any particular power law. We
find that the maximum possible asymmetry at the freeze-out of the n/p ratio at
T \sim 1 MeV strongly depends on the mass-squared difference \delta m^2: the
asymmetry is negligible for \delta m^2 \ll 1 eV^2 and reaches asymptotically
large values for \delta m^2 \ge 50 eV^2.


title: Is the $\sigma(600)$ a Glueball? Two photon reactions can tell us

abstract:
  Minkowski and Ochs have recently argued that the small two photon coupling of
a conjectured $\sigma(600)$ is so small that it is likely to be a glueball. We
ask whether this can be so or whether it is simply gauge invariance that
produces the observed low mass suppression?


title: Radiatively corrected shape function for inclusive heavy hadron decays

abstract:
  We discuss the non-perturbative and the radiative corrections to inclusive B
decays from the point of view known from QED corrections to high energy e^+ e^-
processes. Here the leading contributions can be implemented through the so
called ``radiator function'' which corresponds to the shape function known in
heavy hadron decays. In this way some new insight into the origin of the shape
function is obtained. As a byproduct, a parameterization of the radiatively
corrected shape function is suggested which can be implemented in Monte Carlo
studies of inclusive heavy hadron decays.


title: Analysis of oscillations of atmospheric neutrinos

abstract:
  We briefly review the current status of standard oscillations of atmospheric
neutrinos in schemes with two, three, and four flavor mixing. It is shown that,
although the pure \nu_\mu-->\nu_\tau channel provides an excellent 2\nu fit to
the data, one cannot exclude, at present, the occurrence of additional
subleading \nu_\mu-->\nu_e oscillations (3\nu schemes) or of sizable
\nu_\mu-->\nu_s oscillations (4\nu schemes). It is also shown that the wide
dynamical range of energy and pathlength probed by the Super-Kamiokande
experiment puts severe constraints on nonstandard explanations of the
atmospheric neutrino data, with a few notable exceptions.


title: Influence of a medium on coherent scattering of high-energy photon

abstract:
  The coherent scattering of photon in the Coulomb field (the Delbr\"uck
scattering) is considered for the momentum transfer $\Delta \ll m$ in the frame
of the quasiclassical operator method. In high-energy region this process
occurs over rather long distance. The process amplitude is calculated taking
into account the multiple scattering of particles of the intermediate
electron-positron pair in a medium. The result is the suppression of the
process.


title:
Do precision electroweak constraints guarantee $e^+e^-$ collider
  discovery of at least one Higgs boson of a two-Higgs-doublet model?

abstract:
  We consider a CP-conserving two-Higgs-doublet type II model with a light
scalar or pseudoscalar neutral Higgs boson ($\h=\hl$ or $\h=\ha$) that has no
$ZZ/WW$ coupling and, thus, cannot be detected in $\epem\to Z\h$
(Higgs-strahlung) or $\nu\anti\nu \h$ (via $WW$ fusion). Despite sum rules
which ensure that the light $\h$ must have significant $t\anti t$ or $b\anti b$
coupling, for a wedge of moderate $\tanb$, that becomes increasingly large as
$\mh$ increases, the $\h$ can also escape discovery in both $b\anti b \h$ and
$t\anti t \h$ production at a $\rts=500-800\gev$ $\epem$ collider (for expected
luminosities). If the other Higgs bosons happen to be too heavy to be produced,
then no Higgs boson would be detected. We demonstrate that, despite such high
masses for the other Higgs bosons, only the low-$\tanb$ portion of the
no-discovery wedges in $[\mh,\tanb]$ parameter space can be excluded due to
failure to fit precision electroweak observables. In the $\tanb\gsim 1$ regions
of the no-discovery wedges, we find that the 2HDM fit to precision electroweak
observables has small $\Delta\chi^2$ relative to the best minimal one-doublet
SM fit.


title: Fixing the conformal window in QCD

abstract:
  A physical characterization of Landau singularities is emphasized, which
should trace the lower boundary N_f^* of the conformal window in QCD and
supersymmetric QCD. A natural way to disentangle ``perturbative'' from
``non-perturbative'' contributions to amplitudes below N_f^* is suggested.
Assuming an infrared fixed point persists in the perturbative part of the QCD
coupling even below N_f^* leads to the condition \gamma(N_f^*)=1, where \gamma
is the critical exponent. Using the Banks-Zaks expansion, one gets 4<N_f^*<6.
This result is incompatible with the existence of an analogue of Seiberg
duality in QCD. The presence of a negative ultraviolet fixed point is required
both in QCD and in supersymmetric QCD to preserve causality within the
conformal window. Evidence for the existence of such a fixed point in QCD is
provided.


title:
Radiative Correction to the Transferred Polarization in Elastic
  Electron-Proton Scattering

abstract:
  Model independent radiative correction to the recoil proton polarization for
the elastic electron-proton scattering is calculated within method of electron
structure functions. The explicit expressions for the recoil proton
polarization are represented as a contraction of the electron structure and the
hard part of the polarization dependent contribution into cross-section. The
calculation of the hard part with first order radiative correction is
performed. The obtained representation includes the leading radiative
corrections in all orders of perturbation theory and the main part of the
second order next-to-leading ones. Numerical calculations illustrate our
analytical results.


title: Instantons and Nucleon Magnetism

abstract:
  We construct improved QCD sum rules for the nucleon magnetic moments by
implementing direct-instanton contributions to the operator product expansion
of the nucleon correlator in a magnetic background field. The instanton
contributions are found to affect only those sum rules which had previously
been considered unstable. The new sum rules show a high degree of stability and
reproduce the experimental values of the nucleon magnetic moments for values of
the magnetic quark condensate susceptibility which are consistent with other
estimates.


title:
Unitarity and Interfering Resonances in pipi Scattering and in Pion
  Production piN->pipiN

abstract:
  Additivity of Breit-Wigner phases has been proposed to describe interfering
resonances in partial waves in $\pi\pi$ scattering. This assumption leads to an
expression for partial wave amplitudes that involves products of Breit-Wigner
amplitudes. We show that this expression is equivalent to a coherent sum of
Breit-Wigner amplitudes with specific complex coefficients which depend on the
resonance parameters of all contributing resonances. We use analyticity of
$\pi\pi$ partial wave amplitudes to show that they must have the form of a
coherent sum of Breit-Wigner amplitudes with complex coefficients and a complex
coherent background. The assumption of additivity of Breit-Wigner phases
restricts the partial waves to analytical functions with very specific form of
residues of Breit-Wigner poles. We argue that the general form provided by the
analyticity is more appropriate in fits to data to determine resonance
parameters. The partial wave unitarity can be imposed using the modern methods
of constrained optimization. We discuss unitarity and the production amplitudes
in $\pi N\to\pi\pi N$ and use analyticity in the dipion mass variable to
justify the common practice of writing the production amplitudes as a coherent
sum of Breit-Wigner amplitudes with free complex coefficients and a complex
coherent background in fits to mass spectra with interfering resonances.


title: Does the $D^-/D^+$ production asymmetry decrease at large $x_F$?

abstract:
  We have applied the meson cloud model (MCM) to calculate the asymmetries in
$D$ and $D_s$ meson production in high energy $\Sigma^-$-nucleus and
$\pi^-$-nucleus collisions. We find a good agreement with recent data. Our
results suggest that the asymmetries may decrease at large $x_F$.


title: Hidden Sector Gaugino Condensation and the Observable World

abstract:
  We study the phenomenology of a class of models describing modular invariant
gaugino condensation in the hidden sector of a low-energy effective theory
derived from the heterotic string. Placing simple demands on the resulting
observable sector - such as proper electroweak symmetry-breaking, superpartner
spectra consistent with current limits and neutralino relic densities of an
acceptable magnitude - results in significant restrictions on the possible
configurations of the hidden sector.


title:
Prolongation of Friction Dominated Evolution for Superconducting Cosmic
  Strings

abstract:
  This investigation is concerned with cosmological scenarios based on particle
physics theories that give rise to superconducting cosmic strings (whose
subsequent evolution may produce stable loop configurations known as vortons).
Cases in which electromagnetic coupling of the string current is absent or
unimportant have been dealt with in previous work. The purpose of the present
work is to provide quantitative estimates for cases in which electromagnetic
interaction with the surrounding plasma significantly affects the string
dynamics. In particular it will be shown that the current can become
sufficiently strong for the initial period of friction dominated string motion
to be substantially prolonged, which would entail a reinforcement of the short
length scale end of the spectrum of the string distribution, with potentially
observable cosmological implications if the friction dominated scenario lasts
until the time of plasma recombination.


title:
Quarkonium Production through Hard Comover Rescattering in Polarized and
  Unpolarized pp Scattering

abstract:
  In this paper hadroproduction of charmonium states in polarized pp collisions
is discussed. A thermal picture for the gluonic cloud of comovers is given
making contact between the formalism and the measured unpolarized cross
sections. The experimentally observed non-polarization of the final J/psi
states leads to the consequence that no correlations between the initial proton
spin and the final charmonium spin should be existent. Hence the single spin
asymmetries vanish to leading order in that model.


title:
Lepton Masses and Mixing Angles with Spontaneously Broken O(3) Flavor
  Symmetry

abstract:
  We present a model based on an O(3) flavor symmetry and a minimal extension
of the scalar sector to induce hierarchical breaking, O(3) -> O(2) -> SO(2) ->
nothing. The model naturally accounts for all the known lepton parameters and
yields various interesting predictions for others: (i) Neutrinos are nearly
degenerate, m_\nu \sim 0.1 eV; (ii) The solar neutrino problem is solved by the
MSW small mixing angle solution; (iii) The MNS mixing angle theta_{13} is
unobservably small, theta_{13} = O(10^{-5}).


title:
New effective treatment of the light-front nonvalence contribution in
  timelike exclusive processes

abstract:
  We discuss a necessary nonvalence contribution in timelike exclusive
processes. Following a Schwinger-Dyson type of approach, we relate the
nonvalence contribution to an ordinary light-front wave function that has been
extensively tested in the spacelike exclusive processes. A complicate four-body
energy denominator is exactly cancelled in summing the light-front time-ordered
amplitudes. Applying our method to $K_{\ell3}$ and $D^0\to K^- \ell^+ \nu_l$
where a rather substantial nonvalence contribution is expected, we find not
only an improvement in comparing with the experimental data but also a
covariance(i.e. frame-independence) of existing light-front constituent quark
model.


title: Real-time Nonequilibrium Dynamics in Hot QED Plasmas

abstract:
  The quantum kinetics of photons is studied directly in real time by
implementing the dynamical renormalization group. In contrast to conventional
approach, the dynamical renormalization group method consistently includes
off-shell (energy non-conserving) effects and accounts for time-dependent
collisional kernel. To lowest order we find that in the relaxation time
approximation the semihard photon distribution function relaxes with a power
law.


title: Effective dissipative dynamics for polarized photons

abstract:
  In the framework of open quantum systems, the propagation of polarized
photons can be effectively described using quantum dynamical semigroups. These
extended time-evolutions induce irreversibility and dissipation. Planned, high
sensitive experiments, both in the laboratory and in space, will be able to put
stringent bounds on these non-standard effects.


title:
epsilon'/epsilon and Rare K Decays in the Standard Model and
  Supersymmetry

abstract:
  After briefly reviewing the status of epsilon'/epsilon in the Standard Model,
I discuss SUSY contributions to epsilon'/epsilon, K^+ to pi^+ nu bar nu, K_L to
pi^0 nu bar nu and K_L to pi^0 e^+ e^-. While in the simplest case of the MSSM
with Minimal Flavour Violation the main effect is a suppression of these
transitions with respect to the Standard Model, large enhancements are possible
in more general SUSY models, with interesting correlations among the different
processes.


title: Chiral Meson Masses at Finite Temperature and Density

abstract:
  The ratio of the sigma mass to the pion mass at finite temperatures and
densities provides for a quantitative signal of chiral symmetry breaking. We
calculate this ratio by using an extension to finite chemical potential of the
field theoretic composite operator formalism as applied to QCD. The calculation
is limited to regions of the phase diagram where only quark-antiquark
condensates dominate (no quark-quark condensates) and it confirms the expected
behaviours. In particular the sigma becomes an essentially stable particle in a
narrow region bordering the transition line from broken to restored chirality .
This pattern is qualitatively the same both for the region where the transition
is of second order as for the region where it is of first order (apart from the
discontinuities expected in the latter case).


title:
Soft gluons and gauge-invariant subtractions in NLO parton-shower Monte
  Carlo event generators

abstract:
  We address the problem of decomposing graphs in perturbative QCD into terms
associated with particular regions. Motivated by asking how to incorporate
next-to-leading order (NLO) QCD corrections in parton-shower algorithms, we
require that: (a) The integrand for the hard part is to be integrable even if
the corrections are applied to a process that is not infrared and collinear
safe. (b) The splitting between the terms should be defined gauge-invariantly.
(c) The dependence on cut-offs should obey homogeneous evolution equations. In
the context of one-gluon-emission graphs for deep inelastic scattering, we
explain a subtractive technique that is based on gauge-invariant Wilson-line
operators. Appropriate organization of subtractions involving the soft region
allows a connection to previous work where evolution equations with respect to
the directions of the Wilson lines have been derived.


title: Neutrino Masses and Mixing Angles in a Realistic String-Inspired Model

abstract:
  We analyse a supersymmetric string-inspired model of all fermion masses and
mixing angles based on the Pati-Salam $SU(4)\times SU(2)_L \times SU(2)_R$
gauge group supplemented by a $U(1)_X$ flavour symmetry.
  The model involves third family Yukawa unification and predicts the top mass
and the ratio of the vacuum expectation values $\tan \beta$.
  The model also provides a successful description of the CKM matrix and
predicts the masses of the down and strange quarks.
  However our main focus is on the neutrino masses and MNS mixing angles, and
we show how the recent atmospheric neutrino mixing observed by
Super-Kamiokande, and the MSW solution to the solar neutrino problem lead to
important information about the flavour structure of the model near the string
scale.
  We show how single right-handed neutrino dominance may be implemented by the
use of ``Clebsch zeros'', leading to the LMA MSW solution, corresponding to
bi-maximal mixing. The LOW MSW and SMA MSW solutions are also discussed.


title:
Particle Rapidity Density Saturation in Heavy Ion Collisions and the
  Dual String Model

abstract:
  We show that the Dual String Model with fusion leads, in heavy ion
collisions, to strict saturation of the particle (pseudo-)rapidity density,
normalised to the number of participant nucleons, as that number increases.
Asymptotically, as the centre-of-mass energy goes to infinity with the number
of participants fixed, this density approaches the nucleon-nucleon density.
  A comparison with recent WA98 data is presented.


title:
Searching for Anomalous Higgs Couplings in Peripheral Heavy Ion
  Collisions at the LHC

abstract:
  We investigate the sensitivity of the heavy ion mode of the LHC to anomalous
Higgs boson couplings to photons, H-photon-photon, through the analysis of the
processes photon photon to b anti-b and photon photon to photon photon in
peripheral heavy ion collisions. We suggest cuts to improve the signal over
background ratio and determine the capability of LHC to impose bounds on
anomalous couplings by searching for a Higgs boson signal in these modes.


title: Strong CP problem and mirror world: the Weinberg Wilczek axion revisited

abstract:
  A new possibility for solving the strong CP-problem is suggested,which
assumes that apart of the ordinary world of observable particles described by
standard model, there exits a mirror sector of particles and two sectors share
the same Peccei-Quinn symmetry realized {\it a l\`a} Weinberg-Wilczek model.
The mirror gauge group is completely analogous to that of the standard model
for ordinary particles but having somewhat larger electroweak scale,which in
turn implies the infrared scale $\Lambda'$ of the mirror strong interactions
has to be larger than the ordinary QCD scale $\Lambda$. In this way, the axion
mass and interaction constants are actually determined by mirror sector scales
$v'$ and $\Lambda'$, while the $\theta$ terms are simultaneously cancelled in
both sectors due to mirror symmetry. The experimental and astrophysical limits
on such an axion is discussed. An interesting parameter window is found where
$f_a \sim {\rm few}\times 10^4$ GeV whereas the axion mass is $\sim 1$ MeV.


title: Explanation on Negative Mass-Square of Neutrinos

abstract:
  It has been known for many years that the measured mass-square of neutrino is
probably negative. For solving this puzzle, we have further investigated the
hypothesis that neutrinos are superluminal fermions. A new Dirac-type equation
is proposed and a tachyonic quantum theory is briefly discussed. This equation
is equivalent to two Weyl equations coupled together via nonzero mass while
respecting the maximum parity violation, and it reduces to one Weyl equation
when the neutrino mass becomes zero.


title: Large Two-Loop Contributions to g-2 from a Generic Pseudoscalar Boson

abstract:
  We calculate the dominant contributions to the muon $g-2$ at the two-loop
level due to a generic pseudoscalar boson that may exist in any exotic Higgs
sector in most extensions of the standard model. The leading effect comes from
diagrams of the Barr-Zee type. A sufficiently light pseudoscalar Higgs boson
can give rise to contribution as large as the electroweak contribution which is
measurable in the next round of $g-2$ experiment. Through the contribution we
calculated here, the anticipated improved data in the recent future on the muon
$g-2$ can put the best limit on the possible existence of a light pseudoscalar
boson in physics beyond the standard model.


title: Spectator effects and quark-hadron duality in inclusive beauty decays

abstract:
  The two important issues concerning the theory of inclusive decays are
studied: (1) evaluation of expectation values of four-quark operators in order
to systematically include the spectator effects and (2) estimation of duality
breaking corrections in heavy quark expansion. Our study leads to the
theoretical prediction of the ratio of lifetimes of $\Lambda_b$ and $B$ close
to the experimental one and the duality breaking corrections of about 10% of
the leading decay rate.


title:
Commutators of Lepton Mass Matrices, CP Violation, and Matter Effects in
  Medium-Baseline Neutrino Experiments

abstract:
  We introduce the commutators of lepton mass matrices to describe the
phenomenon of lepton flavor mixing, and establish their relations to the
effective Hamiltonians responsible for the propagation of Dirac and Majorana
neutrinos. The determinants of those commutators are invariant under matter
effects, leading to an instructive relationship between the universal
CP-violating parameters in vacuum and in matter. In the scenario of low-energy
(100 MeV \leq E \leq 1 GeV) and medium-baseline (100 km \leq L \leq 400 km)
neutrino experiments, we illustrate the features of lepton flavor mixing and CP
violation. The terrestrial matter effects on CP- and T-violating asymmetries in
\nu_\mu \to \nu_e and $\bar{\nu}_\mu \to \bar{\nu}_e neutrino oscillations are
also discussed. We demonstrate that a relatively pure signal of leptonic CP
violation at the percent level can be established from such medium-baseline
experiments with low-energy neutrino beams.


title: Hard exclusive photoproduction of $\Phi$ and $J/\Psi$ mesons

abstract:
  We present predictions for differential cross sections for the reaction
$\gamma p \to \Phi p$ and give an outlook to which extent our calculations may
be generalized to the photoproduction of $J/\Psi$ mesons. Our results are
obtained within perturbative QCD treating the proton as a quark-diquark system.


title:
Connecting generalized parton distributions and light-cone wave
  functions

abstract:
  The relation of generalized (skewed) quark distributions to nucleon wave
functions is discussed in the context of light-cone quantization.


title:
Nucleon Transversity Distribution from Azimuthal Spin Asymmetry in Pion
  Electroproduction

abstract:
  The azimuthal asymmetry observed by the HERMES collaboration in
semi-inclusive pion production in deep inelastic scattering of unpolarized
positron on the longitudinally polarized proton target, can provide information
of the quark transversity distributions of the nucleon. We show that the quark
transversity distributions predicted both by the light-cone
quark-spectator-diquark model and by a pQCD inspired model can give consistent
descriptions of the available HERMES data for the analyzing powers
$A_{UL}^{\sin \phi}$ and $A_{UL}^{\sin 2 \phi}$ for $\pi^+$ and $\pi^-$
productions. We also show that the two models give similar predictions of
$A_{UL}^{\sin \phi}$ for $\pi^+$ production, whereas they give very different
predictions of $A_{UL}^{\sin \phi}$ for $\pi^-$ production at large $x$.
Further precision measurement of $A_{UL}^{\sin \phi}$ for $\pi^-$ production
can provide a decisive test of different models.


title: Analytical QCD and multiparticle production

abstract:
  We review the perturbative approach to multiparticle production in hard
collision processes. It is investigated to what extent parton level analytical
calculations at low momentum cut-off can reproduce experimental data on the
hadronic final state. Systematic results are available for various observables
with the next-to-leading logarithmic accuracy (the so-called modified leading
logarithmic approximation - MLLA). We introduce the analytical formalism and
then discuss recent applications concerning multiplicities, inclusive spectra,
correlations and angular flows in multi-jet events. In various cases the
perturbative picture is surprisingly successful, even for very soft particle
production.


title: Four-neutrino oscillation solutions of the atmospheric neutrino anomaly

abstract:
  In the context of neutrino scenarios characterized by four (three active plus
one sterile) neutrino species and by mass spectra with two separated doublets,
we analyze solutions to the atmospheric neutrino anomaly which smoothly
interpolate between \nu_\mu-->\nu_\tau and \nu_\mu-->\nu_s oscillations. We
show that, although the Super-Kamiokande data disfavor the pure \nu_\mu-->\nu_s
channel, they do not exclude its occurrence, with sizable amplitude, in
addition to the \nu_\mu-->\nu_\tau channel. High energy muon data appear to be
crucial in assessing the relative amplitude of active and sterile neutrino
oscillations. It is also qualitatively shown that such atmospheric \nu
solutions are compatible with analogous solutions to the solar neutrino
problem, which involve oscillations of \nu_e in both sterile and active states.


title:
Excited State Contributions to the Heavy Baryon Fragmentation Functions
  in a Quark-Diquark Model

abstract:
  Spin dependent fragmentation functions for heavy flavor quarks to fragment
into heavy baryons are calculated in a quark-diquark model. The production of
intermediate spin 1/2 and 3/2 excited states is explicity included. The
resulting $\Lambda_b$ production rate and polarization at LEP energies are in
agreement with experiment. The $\Lambda_c$ and $\Xi_c$ functions are also
obtained. The spin independent $f_1(z)$ is compared to data. The integrated
values for production rates agree with the data.


title:
Filling up the Two-Body Partial Decay Width of P-Wave Charmonia with the
  Color Octet Contribution

abstract:
  The importance of the color octet component in P-wave charmonia is discussed
in the context of exclusive decay processes. It is vital to include this
contribution already at the level of the two-body decay channels. The \pi \pi
and proton-antiproton channels are used as examples.


title:
The tauola-photos_F environment for versioning the TAUOLA and PHOTOS
  packages

abstract:
  We present the system for versioning two packages: the TAUOLA of tau lepton
decay and PHOTOS for radiative corrections in decays. The following features
can be chosen in automatic or semi-automatic way: (1) format of the common
block HEPEVT; (2) version of the physics input (for TAUOLA): as published, as
initialized by CLEO collaboration, as initialized by ALEPH collaboration (it is
suggested to use this version only with the help of the collaboration advice);
(3) type of application: stand-alone, universal interface through HEPEVT,
interface for KKMC Monte Carlo; (4) random number generators; (5) compiler
options.


title: External Magnetic Fields in QFT: A Non-Perturbative Approach

abstract:
  A discussion of the influence of boundaries and scalar field interactions in
the non-perturbative dynamics of fermions in an external magnetic field, along
with their possible applications to condensed matter and cosmology, is briefly
presented. The significance of the results for electroweak baryogenesis in the
presence of an external magnetic field is indicated.


title:
Non-Perturbative Effects of Strong Magnetic Fields on Neutrino
  Self-energy: A New Approach

abstract:
  The Ritus' $E_{p}$ eigenfunction method is extended to the case of spin-1
charged particles in a constant electromagnetic field and used to calculate the
one-loop neutrino self-energy in the strong-field approximation $m_{e}^{2}\ll
eB\ll M_{W}^{2}$. The implications of the obtained results for neutrino
oscillations in the early Universe, assuming the existence of a sufficiently
large ($m_{e}^{2}\ll eB\ll m_{\mu}^{2}$) primordial magnetic field, are
discussed.


title:
Can Neutrinos and High-Energy Particles Test Finsler Metric of
  Space-Time?

abstract:
  The Finsler-relativistic metric function $F(g;R)$ and the associated
Hamiltonian function $H(g;P)$, being considered together with explicit
Finslerian special-relativistic kinematic transformations, give rise to a
self-consistent and rigorous framework upon which corrections to
Lorentz-relativistic quantities can properly be evaluated. The concomitant
relations generalize their Lorentzian prototypes through the presence of a
single characteristic parameter, ~$g$, so that the explicated
Particle-Antiparticle Asymmetry, as well as the search for possible distinction
between the pseudo-Euclidean Light Geometry and the Finsler-relativistic
Neutrino Geometry, can well be traced in terms of this parameter. At any fixed
rest-mass value $m$ and $g\ne0$, the dependences of energy on three-dimensional
momentum prove to be of different forms, as given by the respective functions
$E^{(+)}(g;m;|{\bf P}|)$ and $E^{(-)}(g;m;|{\bf P}|)$, for particles and
antiparticles. This splitting of the mass-shell, as well as various entailed
Finslerian approximations with respect to $g$, can naturally be proposed for
experimental study in order to obtain estimations on $g$. Since neutrinos and
antineutrinos are uncomposed neat particles, measuring the difference between
their velocities seems to be the best way for testing implied Finslerian
corrections to conventional Lorentzian quantities. Accelerators which can
produce neutrinos and antineutrinos are ideal instruments to gain this aim. The
known measurements led to the conclusion that the difference $<0.7\cdot
10^{-4}~(95%~CL)$, while announced future long baseline neutrino experiments
probably raise the sensitivity to approach the high level of $\sim 10^{-9}$.


title:
Fractional Fokker-Planck Equation and Oscillatory Behavior of Cumulant
  Moments

abstract:
  The Fokker-Planck equation is considered, which is connected to the birth and
death process with immigration by the Poisson transform. The fractional
derivative in time variable is introduced into the Fokker-Planck equation. From
its solution (the probability density function), the generating function (GF)
for the corresponding probability distribution is derived. We consider the case
when the GF reduces to that of the negative binomial distribution (NBD), if the
fractional derivative is replaced to the ordinary one. Formulas of the
factorial moment and the $H_j$ moment are derived from the GF. The $H_j$ moment
derived from the GF of the NBD decreases monotonously as the rank j increases.
However, the $H_j$ moment derived in our approach oscillates, which is
contrasted with the case of the NBD. Calculated $H_j$ moments are compared with
those given from the data in $p\bar{p}$ collisions and in $e^+e^-$ collisions.


title: Gravitational Origin of Quark Masses in an Extra-Dimensional Brane World

abstract:
  Using the warped extra dimension geometry of the many-brane extension of the
Randall-Sundrum solution, we find a natural explanation for the observed quark
masses of the three Standard Model (SM) generations. Localizing massless SM
matter generations on neighboring 3-branes in an extra dimensional world leads
to phenomenologically acceptable effective four dimensional masses arising from
the coupling of the fermion field with the background metric. Thus this
geometry can simultaneously address the gauge and quark mass hierarchy
problems.


title: Rare radiative B decay to the orbitally excited K_2^*(1430) meson

abstract:
  The exclusive rare radiative B meson decay to the orbitally excited tensor
K_2^*(1430) meson is investigated in the framework of the relativistic quark
model based on the quasipotential approach in quantum field theory. The
calculated branching ratio BR(B --> K_2^*(1430)\gamma)=(1.7\pm 0.6)\times
10^{-5} as well as the ratio BR(B --> K_2^*(1430)\gamma)/BR(B -->
K^*(892)\gamma)=0.38\pm 0.08 is found in a good agreement with recent
experimental data from CLEO.


title:
Parton distribution functions from nonlocal light-cone operators with
  definite twist

abstract:
  We introduce the chiral-even and chiral-odd quark distributions as forward
matrix elements of related bilocal quark operators with well-defined
(geometric) twist. Thereby, we achieve a Lorentz invariant classification of
these distributions which differ from the conventional ones by explicitly
taking into account the necessary trace terms. The relations between both kinds
of distribution functions are given and the mismatch between their different
definition of twist is discussed. Wandzura-Wilczek--like relations between the
conventional distributions (based on dynamical twist) are derived by means of
geometric twist distribution functions.


title: Search Strategies for non-Standard Higgses at e+e- Colliders

abstract:
  The Higgs search strategies in minimal non-supersymmetric extensions of the
SM are discussed.


title:
$\rho$-Meson wave functions from nonlocal light-cone operators with
  definite twist

abstract:
  We introduce chiral-even and chiral-odd meson wave functions as
vacuum-to-meson matrix elements of bilocal quark operators with well-defined
(geometric) twist. Thereby, we achieve a Lorentz invariant classification of
these distributions which differ from the conventional ones by explicitly
taking into account the trace terms. The relations between conventional and new
wave functions are given.


title:
Determination of the pion-nucleon coupling constant and scattering
  lengths

abstract:
  We critically evaluate the isovector GMO sum rule for forward pion-nucleon
scattering using the recent precision measurements of negatively charged
pion-proton and pion-deuteron scattering lengths from pionic atoms. We deduce
the charged-pion-nucleon coupling constant, with careful attention to
systematic and statistical uncertainties. This determination gives, directly
from data a pseudoscalar coupling constant of
14.11+-0.05(statistical)+-0.19(systematic) or a pseudovector one of 0.0783(11).
This value is intermediate between that of indirect methods and the direct
determination from backward neutron-proton differential scattering cross
sections. We also use the pionic atom data to deduce the coherent symmetric and
antisymmetric sums of the negatively charged pion-proton and pion-neutron
scattering lengths with high precision. The symmetric sum gives
0.0012+-0.0002(statistical)+-0.0008 (systematic) and the antisymmetric one
0.0895+-0.0003(statistical)+-0.0013(systematic), both in units of inverse
charged pion-mass. For the need of the present analysis, we improve the
theoretical description of the pion-deuteron scattering length.


title: Damping of the HERA effect in DIS?

abstract:
  The drastic rise of the proton structure function F_2(x,Q^2) when the
Bj\"orken variable x decreases, seen at HERA for a large span of Q^2, negative
values for the 4-momentum transfer, may be damped when Q^2 increases beyond
several hundreds GeV^2. A new data analysis and a comparison with recent models
for the proton structure function is proposed to discuss this phenomenon in
terms of the derivative \partial ln F_2(x,Q^2)/\partial ln(1/x).


title: Hybrid mesons from lattice QCD

abstract:
  Recent lattice simulation studies of heavy-quark hybrid mesons in which the
quark and antiquark are bound together by an excited gluon field are
summarized.


title: Soft gluon cascades and BFKL equation

abstract:
  In this paper we deal with high energy scattering in the Regge limit, using a
soft cascade approach. We derive an evolution equation for the gluon density in
soft gluons cascades in the leading logarithmic approximation of perturbative
QCD, and show that this equation reproduces BFKL equation in the forward case.
The whole cascade is equivalent to a single gluon whose self-energy is
responsible for gluon reggeization. The same type of equation is obtained for
the QED case.


title: Can CP entanglement with the environment mask CP violation?

abstract:
  We consider departures from hamiltonian dynamics in the evolution of neutral
kaons due to their interactions with the environment that generate entanglement
among them.


title: Indirect Violation of CP, T and CPT in the Bd-system

abstract:
  The problem of indirect violation of discrete symmeties CP, T and CPT in a
neutral meson system can be described using two complex parameters epsilon and
delta, which are invariant under rephasing of meson and quark fields. For the
Bd system, where the width difference between the physical states is
negligible, only Re(delta) and Im(epsilon) survive. As a consequence, the
traditional observables constructed for kaons, which are based on flavour tag,
are not useful for the analogous study in this system. We describe how using a
CP tag and studying CP-to-flavour transitions of the B mesons, we may build
asymmetries, alternative to those used for the kaon, which enable us to test T
and CPT invariances of the effective hamiltonian for the Bd system.


title:
$\bar d - \bar u$ asymmetry and semi-inclusive production of pions in
  DIS

abstract:
  We investigate unambiguities in the extraction of the $\bar d - \bar u$
asymmetry from semi-inclusive production of pions in DIS. The role of several
effects beyond the quark-parton model (QPM) which lead to $N_p^{\pi^+} \ne
N_n^{\pi^+}$ and $N_p^{\pi^-} \ne N_n^{\pi^-}$ and may therefore cloud such an
extraction is studied. The results are discussed in the context of the recent
HERMES data. We find that the interaction of the resolved photon with the
nucleon significantly modifies the observed $\bar d - \bar u$ asymmetry. The
exclusive elastic production of $\rho$ mesons plays a similar role for the
large-$z$ data sample. Our estimate shows a rather small effect of the
spectator mechanism. Nuclear effects in the deuteron also look potentially
important but are difficult to estimate quantitatively.
  Throughout the paper we make in addition several general remarks concerning
semi-inclusive and exclusive production of mesons.


title: Echoes of the fifth dimension?

abstract:
  In this article we examine the question of whether the highest energy cosmic
ray primaries could be ultra relativistic magnetic monopoles. The analysis is
performed within the framework of large compact dimensions and TeV scale
quantum gravity. Our study indicates that while this hypothesis must be
regarded as highly speculative it cannot be ruled out with present data.


title: Top Mass Measurement and Bottom Fragmentation at the LHC

abstract:
  We show some recent HERWIG results related to the top quark mass measurement
at the LHC and discuss possible improvements for studies of the bottom quark
fragmentation function in the top decay.


title: eps'/eps in the standard model

abstract:
  I discuss the estimate of the CP-violating ratio eps'/eps by stressing the
role played by the chiral quark model in predicting the experiment and in
showing that the same dynamical mechanism at work in the Delta I=1/2 rule also
explains the larger value obtained for eps'/eps in this model with respect to
other estimates.


title: Multiplicities in Parton and Dipole QCD Cascades

abstract:
  Evolution equations for multiplicities in QCD cascades can, both in the
parton and dipole picture, be used to estimate corrections beyond the formal
accuracy of the modified leading log approximation (MLLA). The differences
between the two pictures, and other uncertainties beyond first order MLLA
corrections, are here investigated in some detail. For example, I discuss how
some colour suppressed corrections, which cannot be determined without better
knowledge of non-perturbative QCD, are related to the question of colour
reconnection. A generalized evolution equation for the dipole cascade is also
presented.


title: Precision of electro--weak couplings of scalar leptoquarks at TESLA

abstract:
  We investigate the potential to measure the electro-weak couplings of scalar
leptoquarks $\Phi_s$ at TESLA for energies in the range of $\sqrt{s} \simeq 1
\TeV$ using the pair production process $e^+e^- \to \Phi_s \bar{\Phi}_s$.


title:
Heavy Quarkonium Physics beyond the Next-to-Next-to-Leading Order of
  NRQCD

abstract:
  In this talk I briefly review the recent progress in calculation of the high
order corrections to the parameters of the nonrelativistic heavy
quark-antiquark system in the effective theory approach.


title: Discovery and Identification of W' Bosons at e+e- Colliders

abstract:
  We report on studies of the sensitivity to extra gauge bosons of the
reactions e^+ e^- -> nu nubar gamma and e gamma -> nu q + X to extract
discovery limits for W' 's. The discovery potential for a W' is, for some
models, comparable to that of the LHC. These processes may be also useful for
determining W' and Z' couplings to fermions which would complement measurements
made at the Large Hadron Collider.


title:
A Study of the Thermodynamical Properties of a Hot, Dense Hadron Gas
  Using an Event Generator - Hadro-Molecular-Dynamical Calculation -

abstract:
  We investigate the equilibration and the equation of state of a hot hadron
gas at finite baryon density using an event generator which is designed to
approximately satisfy detailed balance at finite temperatures and finite baryon
densities of the hadronic scale (80 MeV < T < 170 MeV and 0.157 fm^-3 < n_B <
0.315 fm^-3). Molecular-dynamical simulations were performed for a system of
hadrons in a box with periodic boundary conditions. Starting from an initial
state composed of only nucleons with a uniform phase-space distribution, the
evolution takes place through interactions such as collisions, productions and
absorptions. The system approaches a stationary state of baryons, mesons and
their resonances, which is characterized by the value of the exponent in the
energy distribution common to the different particles, i.e., the temperature.
After the equilibration, thermodynamic quantities, such as the energy density,
particle density, entropy and pressure are calculated. Above T - m_pi, the
obtained equation of state exhibits a significant deviation from the naive
mixed free gas model. Large values of the entropy per baryon are also notable.
In our system, the excitation of heavy baryon resonances and meson production
are enhanced simultaneously, and the increase of the temperature becomes
moderate, but a Hagedorn-type artificial temperature saturation does not occur.
The pressure exhibits a linear dependence on the energy density.


title:
Charged Particle Fluctuations as a Signal of the Dynamics of Heavy Ion
  Processes

abstract:
  Comparing proposed quantities to analyze charged particle fluctuations in
heavy ion experiments we find the dispersion of the charges in a central
rapidity box as best suited. Various energies and different nuclear sizes were
considered in an explicit Dual-Parton-Model calculation using the DPMJET code.
A definite deviation from predictions of recently considered statistical models
was obtained. Hence the charged particle fluctuations should provide a clear
signal of the dynamics of heavy ion processes. They should allow to directly
measure the degree of thermalization in a quantitative way.


title: Conceptual aspects of QCD factorization in hadronic B decays

abstract:
  I review the meaning of ``QCD factorization'' in hadronic two-body B decays
and then discuss recent results of theoretical (rather than phenomenological)
nature: the proof of factorization at two loops; the identification of
``chirally enhanced'' power corrections; and the role of annihilation
contributions.


title: Horizontal $U(1)_H$ symmetry: a non-anomalous model

abstract:
  Spontaneously broken Abelian gauge symmetries can explain the fermion mass
hierarchies of the minimal supersymmetric standard model. In most cases it is
assumed that the $U(1)_H$ symmetry is anomalous. However, non-anomalous models
are also viable and yield an interesting phenomenology. Cancellation of the
gauge anomalies implies the following results: unification of leptons and
down-type quarks Yukawa couplings is allowed at most for two generations. The
$\mu$ term is necessarily somewhat below the supersymmetry breaking scale. The
superpotential has accidental $B$ and $L$ symmetries, and R-parity is
automatically conserved in the supersymmetric limit. Anomaly canncellation also
implies that the determinant of the quark mass matrix must vanish, wich is
possible only if $m_{up}=0$. This solves the strong CP problem and provides an
unambiguous low energy test of the model.


title: An estimate of a lower bound on the masses of mirror baryons

abstract:
  We consider the most favorable conditions to indirectly observe the mixing of
ordinary and mirror hadrons in non-leptonic and weak radiative decays of
hyperons. This allows us to set a lower bound on the masses of mirror baryons.
This bound turns out to be impressively high, of the order of $10^6$GeV.


title: Color conductivity and ladder summation in hot QCD

abstract:
  The color conductivity is computed at leading logarithmic order using a Kubo
formula. We show how to sum an infinite series of planar ladder diagrams,
assuming some approximations based on the dominance of soft scattering
processes between hard particles in the plasma. The result agrees with the one
obtained previously from a kinetical approach.


title: Charmed baryons from lattice QCD

abstract:
  The results of a recent quenched lattice QCD simulation for charmed baryons
are presented. In contrast to a previous calculation, it is found that
hyperfine splittings are in agreement with quark model expectations and
comparable to experimental values. Preliminary calculations using lattice NRQCD
yield results which are compatible with those obtained using a Dirac-Wilson
action of the D234 type for the charm quark.


title:
Droplet Formation in Quark-Gluon Plasma at Low Temperatures and High
  Densities

abstract:
  Considering the low-temperature ($T$) and high-baryon-number-density ($n_B$)
region of the QCD phase diagram, we present a model for the first-order phase
transition between the quark-gluon plasma (QGP) and the recently proposed
colour superconducting phase. We study nucleation of a droplet of the
superconducting phase within the metastable QGP gas. Numerical results for the
activation energy, radius and other physical parameters of the droplets, at
various temperatures, densities and gap parameters, are given. We have
estimated the latent heat of the phase transition. In the $T-n_B$ plane, we are
able to demarcate the region of the superconducting phase.


title:
Weak and Electromagnetic Nuclear Decay Signatures for Neutrino Reactions
  in SuperKamiokande

abstract:
  We suggest the study of events in the SuperKamiokande neutrino data due to
charged- and neutral-current neutrino reactions followed by weak and/or
electromagnetic decays of struck nuclei and fragments thereof. This study could
improve the prospects of obtaining evidence for $\tau$ production from $\nu_\mu
\to \nu_\tau$ oscillations and could augment the data sample used to disfavor
$\nu_\mu \to \nu_{sterile}$ oscillations.


title: Correlated Scattering and Cluster Planes

abstract:
  We suggest a new correlation in diffractive production of 2 ``clusters''
$A+B\to A^\ast B^\ast$ with large intrinsic angular momenta for each $A^\ast$
and $B^\ast$ cluster. These correlations are expected in the context of the
``color dipole picture'' for high energy collision and reflect the approximate
conservation of dipole direction during the collision. This conservation is in
particular manifest when the two dipoles, $\vec d_A$, $\vec d_B$ and the impact
vector $\undtilb$ are all parallel. The predicted positive triple correlation
is between the momentum transfer $\undtildel$ and the planes of the $A^\ast$
and $B^\ast$ clusters.


title:
Searching for the Higgs Boson at Hadron Colliders using the Missing Mass
  Method

abstract:
  If the Higgs is produced with a large enough cross section in the {\em
exclusive} reaction $p + \bar{p} \to p + H + \bar{p}$ it will give rise to a
peak at $M_H$ in the {\em missing mass} ($MM$) spectrum, calculated from the
4-momenta of the beam particles and the outgoing $p$ and $\bar{p}$. The
resolution in $MM$ can be approximately 250 MeV, independent of $M_H$ from 100
GeV to 200 GeV. This high resolution makes a search feasible over nearly this
full mass range at the Tevatron with 15 fb$^{-1}$ as hoped for in Run II.


title:
B -> X_s gamma in supersymmetry: large contributions beyond the leading
  order

abstract:
  We discuss possible large contributions to B -> X_s gamma, which can occur at
the next-to-leading order in supersymmetric models. They can originate from
terms enhanced by tan(beta) factors, when the ratio between the two Higgs
vacuum expectation values is large, or by logarithm of M_{susy}/M_W, when the
supersymmetric particles are considerably heavier than the W boson. We give
compact formulae which include all potentially large higher-order
contributions. We find that tan(beta) terms at the next-to-leading order do not
only appear from the Hall-Rattazzi-Sarid effect (the modified relation between
the bottom mass and Yukawa coupling), but also from an analogous effect in the
top-quark Yukawa coupling. Finally, we show how next-to-leading order
corrections, in the large tan(beta) region, can significantly reduce the limit
on the charged-Higgs mass, even if supersymmetric particles are very heavy.


title: Flat Directions in Flipped SU(5) I: All-Order Analysis

abstract:
  We present a systematic classification of field directions for the
string-derived flipped SU(5) model that are D- and F-flat to all orders.
Properties of the flipped SU(5) model with field values in these directions are
compared to those associated with other flat directions that have been shown to
be F-flat to specific finite orders in the superpotential. We discuss the
phenomenological Higgs spectrum, and quark and charged-lepton mass textures.


title:
Solar neutrino results and Violation of the Equivalence Principle: An
  analysis of the existing data and predictions for SNO

abstract:
  Violation of the Equivalence Principle (VEP) can lead to neutrino oscillation
through the non-diagonal coupling of neutrino flavor eigenstates with the
gravitational field. The neutrino energy dependence of this oscillation
probability is different from that of the usual mass-mixing neutrino
oscillations. In this work we explore, in detail, the viability of the VEP
hypothesis as a solution to the solar neutrino problem in a two generation
scenario with both the active and sterile neutrino alternatives, choosing these
states to be massless. To obtain the best-fit values of the oscillation
parameters we perform a chi square analysis for the total rates of solar
neutrinos seen at the Chlorine (Homestake), Gallium (Gallex and SAGE),
Kamiokande, and SuperKamiokande (SK) experiments. We find that the goodness of
these fits is never satisfactory. It markedly improves, especially for VEP
transformation to sterile neutrinos, if the Chlorine result is excluded from
the analysis. The 1117-day SK data for recoil electron spectrum are also
examined for signals of VEP oscillations. For these fits, we consider
variations of the Standard Solar Model by allowing the absolute normalizations
of the 8B and hep neutrinos to vary. Here the fits are quite good but the best
fit values of the parameters are rather different from those from the total
rates fits. A combined fit to the total rates and recoil electron spectrum data
is also performed. We present the 90% confidence limit contours for all the
three analyses mentioned above. The best-fit parameters obtained from the
recoil electron spectrum and the combined analysis of rate and spectrum are
used to predict the charge current and scattering electron spectrum at SNO.


title: Quasi-multi-Regge Processes with a Quark Exchange in the t-channel

abstract:
  The QCD amplitudes for particle's production in the quasi-multi-Regge
kinematics with a quark exchange in crossing channels are calculated in the
Born approximation. In particular they are needed to find next-to-leading
corrections to the quark Regge trajectory and to the integral kernel of the
Bethe-Salpeter equation for the t-channel partial wave with fermion quantum
numbers and a negative signature. The gauge-invariant action for the
interaction of the reggeized quarks and gluons with the usual particles is
constructed.


title: Sigma-term physics in the perturbative chiral quark model

abstract:
  We apply the perturbative chiral quark model (PCQM) at one loop to analyse
meson-baryon sigma-terms. Analytic expressions for these quantities are
obtained in terms of fundamental parameters of low-energy pion-nucleon physics
(weak pion decay constant, axial nucleon coupling, strong pion-nucleon form
factor) and of only one model parameter (radius of the nucleonic three-quark
core). Our result for the piN sigma term of about 45 MeV is in good agreement
with the value deduced by Gasser, Leutwyler and Sainio using
dispersion-relation techniques and exploiting the chiral symmetry constraints.


title: Neutrino interactions with a weak slowly varying electromagnetic field

abstract:
  We derive the effective action for processes involving two neutrinos and two
photons at energies much below the electron mass. We discuss several
applications in which one or both photons are replaced by external fields. In
particular, Cherenkov radiation and neutrino pair production in weak external
fields are investigated for massive Dirac neutrinos.


title:
Transverse momentum dependence in gluon distribution and fragmentation
  functions

abstract:
  We investigate the twist two gluon distribution functions for spin 1/2
hadrons, emphasizing intrinsic transverse momentum of the gluons. These
functions are relevant in leading order in the inverse hard scale in scattering
processes such as inclusive leptoproduction or Drell-Yan scattering, or more
general in hard processes in which at least two hadrons are involved. They show
up in azimuthal asymmetries. For future estimates of such observables, we
discuss specific bounds on these functions.


title:
The description for the spin polarizabilities of hadrons based on the
  covariant Lagrangian

abstract:
  On the basis of the correspondence principle between the relativistic moving
medium electrodynamics and relativistic quantum field theory the covariant
Lagrangian of the electromagnetic field interaction with the polarized spin
particles have been obtained. This Lagrangian satisfies the main relativistic
quantum field theory requirements and contains four independent covariant spin
structures, which have particular physical meaning. It is shown that the spin
polarizabilities give the contribution to the amplitude for Compton scattering
on the spin-1/2 hadron in the ${\cal O}(\omega^3)$.


title:
Double-logarithmic asymptotics of the electromagnetic form factors of
  the electron and quark

abstract:
  The asymptotic behaviour of the electromagnetic form factors of the electron
and quark is obtained in the double-logarithmic approximation for Sudakov
kinematics, i.e. for the case that the value of the momentum transfer is much
greater than the mass of the particle.


title:
Electroweak Corrections to the Deacy $H^+\to W^+h$ in the Minimal
  Supersymmetric Model

abstract:
  We calculate the $O(\alpha_{ew}m_{t(b)}^{2}/m_{W}^{2})$ and $O(\alpha_{ew}
m_{t(b)}^4/m_W^4)$ supersymmetric electroweak corrections to the process
$H^+\to W^+h$ in the Minimal Supersymmetric Model. These corrections arise from
the virtual effects of the third family quaurks (top and bottom) and squarks
(top-squark and bottom-squark). We find that for $m_{H^+}>200$GeV at low
$\tan\beta(\leq 3)$, the corrections can increase the tree-level decay widths
and the branching radios more than 20% and 40%, respectively.


title:
Top quark threshold production in $\gamma\gamma$ collisions: current
  theoretical issues

abstract:
  The top quark-antiquark pair threshold production at future High Energy
Photon Colliders is considered in view of the recent advances in the
theoretical description of the nonrelativistic heavy quark dynamics.


title: Has the QCD RG-Improved Parton Content of Virtual Photons been Observed?

abstract:
  It is demonstrated that present $e^+e^-$ and DIS ep data on the structure of
the virtual photon can be understood entirely in terms of the standard `naive'
quark--parton model box approach. Thus the QCD renormalization group (RG)
improved parton distributions of virtual photons, in particular their gluonic
component, have not yet been observed. The appropriate kinematical regions for
their future observation are pointed out as well as suitable measurements which
may demonstrate their relevance.


title: On a fate of hot quantum field theories

abstract:
  It is argued that for hot quantum fields, the necessary effective
perturbation theories may be based on a resummation procedure which, contrarily
to the zero temperature case, differs substantially from the one ordinarily in
use. Important differences show up in the infrared sector of hot quantum field
theories.


title: Global three-neutrino oscillation analysis of neutrino data

abstract:
  A global analysis of the solar, atmospheric and reactor neutrino data is
presented in terms of three-neutrino oscillations. We include the most recent
solar neutrino rates of Homestake, SAGE, GALLEX and GNO, as well as the recent
1117 day Super-Kamiokande data sample, including the recoil electron energy
spectrum both for day and night periods and we treat in a unified way the full
parameter space for oscillations, correctly accounting for the transition from
the matter enhanced (MSW) to the vacuum oscillations regime. Likewise, we
include in our description conversions with $\theta_{12} > \pi/4$. For the
atmospheric data we perform our analysis of the contained events and the
upward-going $\nu$-induced muon fluxes, including the previous data samples of
Frejus, IMB, Nusex, and Kamioka experiments as well as the full 71 kton-yr
(1144 days) Super-Kamiokande data set, the recent 5.1 kton-yr contained events
of Soudan2 and the results on upgoing muons from the MACRO detector. We first
present the allowed regions of solar and atmospheric oscillation parameters
$\theta_{12}$, $\Delta m^2_{21}$ and $\theta_{23}$, $\Delta m^2_{32}$,
respectively, as a function of $\theta_{13}$ and determine the constraints from
atmospheric and solar data on the mixing angle $\theta_{13}$, common to solar
and atmospheric analyses. We also obtain the allowed ranges of parameters from
the full five-dimensional combined analysis of the solar, atmospheric and
reactor data.


title: Puzzling aspects of hot quantum fields

abstract:
  Over the past decade, Finite Temperature Quantum Field Theories have
benefitted from impressive developments, while an increasing number of
intriguing points were made. Some of them are presented here, recent and older,
in a non exhaustive list.