title: Variational Approach to Hydrodynamics - from QGP to General Relativity

abstract:
  We derive the special and general relativistic hydrodynamic equations of
motion for ideal fluids from a variational principle. Our approach allows to
find approximate solutions, whenever physically motivated trial functions can
be used. Illustrating this, a Rayleigh-Plesset type equation for the
relativistic motion of a spherical (QGP) droplet is obtained. Also the
corresponding general relativistic effective Lagrangian for spherically
symmetric systems is presented.


title:
Testing Buda-Lund hydro model on particle correlations and spectra in
  NA44, WA93 and WA98 heavy ion experiments

abstract:
  Analytic and numerical approximations to a hydrodynamical model describing
longitudinally expanding, cylindrically symmetric, finite systems are fitted to
preliminary NA44 data measured in 200 AGeV central $S + Pb$ reactions. The
model describes the measured spectra and HBT radii of pions, kaons and protons,
simultaneously. The source is characterized by a central freeze-out temperature
of T_0 = 154 +/- 8 +/- 11 MeV, a "surface" temperature of T_r = 107 +/- 28 +/-
18 MeV and by a well-developed transverse flow, <u_t> = 0.53 +/- 0.17 +/- 0.11.
The transverse geometrical radius and the mean freeze-out time are found to be
R_G = 5.4 +/- 0.9 +/- 0.7 fm and tau_0 = 5.1 +/- 0.3 +/- 0.3 fm/c,
respectively. Fits to preliminary WA93 200 AGeV S + Au and WA98 158 AGeV Pb +
Pb data dominated by pions indicate similar model parameters. The absolute
normalization of the measured particle spectra together with the experimental
determination of both the statistical and the systematic errors were needed to
obtain successful fits.


title: Sensitivity of CPT Tests with Neutral Mesons

abstract:
  The sensitivity of experiments with neutral mesons to possible indirect CPT
violation is examined. It is shown that experiments conventionally regarded as
equivalent can have CPT reaches differing by orders of magnitude within the
framework of a minimal CPT- and Lorentz-violating extension of the standard
model.


title: Gluon plasmon frequency near the light-cone

abstract:
  Thermal perturbation theory based on the resummation scheme by Braaten and
Pisarski suffers from unscreened collinear singularities whenever outer momenta
become light-like. A recently proposed improvement of the hard thermal loops by
an additional resummation of an asymptotic mass promises to solve this problem.
Here we present a detailed investigation of the next-to-leading order plasmon
self-energy. It demonstrates the applicability and consistency of the improved
scheme.


title: Preheating and the Einstein Field Equations

abstract:
  We inaugurate a framework for studying preheating and parametric resonance
after inflation without resorting to any approximations, either in
gravitational perturbation theory or in the evolution of the field(s). We do
this by numerically solving the Einstein field equations in the
post-inflationary universe. In this letter we show how to compare our results
to those of gauge invariant perturbation theory. We then verify Finelli and
Brandenberger's analysis (hep-ph/9809490) of super-horizon modes in $m^2\phi^2$
inflation, showing that they are not amplified by resonant effects. Lastly, we
make a preliminary survey of the nonlinear couplings between modes, which will
be important in models where the primordial metric perturbations undergo
parametric amplification.


title: Interpretation of D(2637) from heavy quark symmetry

abstract:
  We demonstate from heavy quark symmetry that the width of D(2637) claimed by
the DELPHI Collaboration is inconsistent with any bound state with one charm
quark predicted in the D(2637) mass region, except possibly D*_3, D_2 or D'.
The former two possibilities are favoured by heavy quark mass relations.


title: Excited Heavy Baryon Spectrum in Large N_c Heavy Quark Effective Theory

abstract:
  L=1 excited heavy baryon masses are analyzed by heavy quark and large N_c
expansions. In heavy quark limit, mass is parameterized by \Lambda-bar and it
is expanded further by spin-flavor breaking operators to the zeroth order of
1/N_c. Expanding coefficients will be fixed by more data on the excited baryons
in the near future.


title: Spin Effects In Diffractive $J/\Psi$ And $Q \Bar Q$ Leptoproduction

abstract:
  We study the dependencies of spin asymmetries in diffractive leptoproduction
on the spin structure of the pomeron coupling. It is shown that the $A_{ll}$
asymmetry in diffractive processes is proportional to the fraction of the
initial proton momentum $x_p$ carried off by the pomeron. The resulting
asymmetries decrease with increasing energy for diffractive $J/\Psi$ production
and are energy independent for diffractive $Q \bar Q$ leptoproduction. The
connection of these asymmetries with the non-forward gluon distribution in the
proton is discussed.


title:
Spin Asymmetries In Proton-Proton Scattering At High Energies And
  Moderately Large Momentum Transfer

abstract:
  We study $pp$ scattering at high energies and moderately large momentum
transfer using a QCD--based model in which the proton is viewed as being
composed of a quark and a diquark. This model leads to spin asymmetries which
are neither small nor vanish at high energies. The predicted ratio of helicity
flip and non-flip amplitudes is about 0.2-0.3 and $A_n$ asymmetry is about
20-30% for $|t| > 4 {GeV}^2$.


title: The quark inside hadron

abstract:
  We study and solved Schwinger-Dayson equation for massive quarks in the quark
model. Interaction potential is choose as sum oscillator and Coulomb terms. The
calculation show us that negative energy of quark exist under $m_{o} \ll \Vo$
i.e. when mass quark is less that parameters of scale. Us are offered to use
asymptotical behaviour at the solutions Schwinger-Dayson equation selection
physical and non-physical conditions. The quark condensate under different
values mass quarks are calculated. The scale parameters $\Vo$= 520 MeV.


title: Rare Non-hadronic b Decays

abstract:
  This paper summarizes current results for rare non-hadronic b decay
processes. The world average Br(b -> s gamma)=(3.14 +/-0.48)x10^(-4) is in
agreement with the standard model prediction. Upper limits on b-> s l^+ l^- and
b -> l^+ l^- are also given. Finally B^- -> l^- nu upper limits are presented
as well as the world average value of (255+/- 21 +/- 28) MeV for f_{Ds} from
D_s^+ -> l^+ nu decay rate measurements.


title:
Hyperon polarization and single-spin asymmetries in different hadronic
  reactions

abstract:
  We show that the polarization of hyperons observed in high energy collisions
using unpolarized hadron beams and unpolarized nucleon or nuclear targets is
closely related to the left-right asymmetries observed in single spin inclusive
hadron production processes. The relationship is most obvious for the
production of the hyperons which have only one common valence quark with the
projectile. Further implications of the existence of large polarization for
hyperon which has two valence quarks in common with the projectile and their
consequences are discussed. A comparison with the available data is made.
Further tests are suggested.


title: Phenomenology of Low Quantum Gravity Scale Models

abstract:
  We study some phenomenological implications of models where the scale of
quantum gravity effects lies much below the four-dimensional Planck scale.
These models arise from M-theory vacua where either the internal space volume
is large or the string coupling is very small. We provide a critical analysis
of ways to unify electroweak, strong and gravitational interactions in
M-theory. We discuss the relations between different scales in two M-vacua:
Type I strings and Ho\v rava-Witten supergravity models. The latter allows
possibilities for an eleven-dimensional scale at TeV energies with one large
dimension below separating our four-dimensional world from a hidden one.
Different mechanisms for breaking supersymmetry (gravity mediated, gauge
mediated and Scherk-Schwarz mechanisms) are discussed in this framework. Some
phenomenological issues such as dark matter (with masses that may vary in
time), origin of neutrino masses and axion scale are discussed. We suggest that
these are indications that the string scale may be lying in the $10^{10} -
10^{14}$ GeV region.


title:
A First Principles Warm Inflation Model that Solves the Cosmological
  Horizon/Flatness Problems

abstract:
  A quantum field theory warm inflation model is presented that solves the
horizon/flatness problems. The model obtains, from the elementary dynamics of
particle physics, cosmological scale factor trajectories that begin in a
radiation dominated regime, enter an inflationary regime and then smoothly exit
back into a radiation dominated regime, with nonnegligible radiation throughout
the evolution.


title: Testing CPT and Lorentz Symmetry with Neutral-Kaon Oscillations

abstract:
  In this talk, a brief summary is given of the possibility of using
neutral-kaon oscillations to bound CPT- and Lorentz-breaking parameters in an
extension of the minimal standard model.


title: Relic Abundance due to Cosmic Pair Annihilation

abstract:
  Pair annihilation of heavy stable particles that occurs in the early universe
is reconsidered including the off-shell effect not properly taken into account
by the conventional Boltzmann equation approach. Our new calculation of the
time evolution shows that the off-shell effect prolongs the freeze-out, always
with a larger final relic abundance. The final yield (number
density/temperature^3) is insensitive to the effective coupling for the
annihilation and of order (10^{- 8}\times (M/1 GeV)^{1/3}), with $M$ the heavy
particle mass, if the coupling is not too small.


title: B decays to excited charm mesons

abstract:
  We review several aspects of the phenomenology of P-wave $\bar q Q$ mesons:
mass splittings, effective strong couplings and leptonic constants. We also
describe a QCD sum rule determination to order $\alpha_s$ of the form factor
$\tau_{1/2}(y)$ governing the semileptonic $B$ decays to the charm doublet with
$J^P=(0^+_{1/2},1^+_{1/2})$.


title:
New Enhancement Mechanism of the Transitions in the Earth of the Solar
  and Atmospheric Neutrinos Crossing the Earth Core

abstract:
  It is shown that the $\nu_2 \to \nu_{e}$ and $\nu_{\mu} \to \nu_{e}$ ($\nu_e
\to \nu_{\mu (\tau)}$) transitions respectively of the solar and atmospheric
neutrinos in the Earth in the case of $\nu_e - \nu_{\mu (\tau)}$ mixing in
vacuum, are strongly enhanced by a new type of resonance when the neutrinos
cross the Earth core. The resonance is operative at small mixing angles but
differs from the MSW one. It is in many respects similar to the electron
paramagnetic resonance taking place in a specific configuration of two magnetic
fields. The conditions for existence of the new resonance include, in
particular, specific constraints on the neutrino oscillation lengths in the
Earth mantle and in the Earth core, thus the resonance is a ``neutrino
oscillation length resonance''. It leads also to enhancement of the $\nu_2 \to
\nu_e$ and $\nu_e \to \nu_s$ transitions in the case of $\nu_e - \nu_s$ mixing
and of the $\bar{\nu}_{\mu} \to \bar{\nu}_{s}$ (or $\nu_{\mu} \to \nu_{s}$)
transitions at small mixing angles. The presence of the neutrino oscillation
length resonance in the transitions of solar and atmospheric neutrinos
traversing the Earth core has important implications for current and future
solar and atmospheric neutrino experiments, and more specifically, for the
interpretation of the results of the Super-Kamiokande experiment.


title: Hadronic Interactions and TeV Muons in Cosmic Ray Cascades

abstract:
  In view of the interpretation of data collected by large, deep underground
experiments in terms of primary Cosmic Ray physics, this work is focused on the
study of the production of of TeV muons in Extensive Air Showers. The review
tries to point out those features of hadronic interactions that mostly affect
the production of the high energy muons. A few different Monte Carlo codes are
compared, with a particular attention to those based on the Regge-Gribov
framework. The possibility of performing experimental tests of the proposed
models is also briefly discussed.


title:
Effect of m_c on b quark chromomagnetic interaction and on-shell
  two-loop integrals with two masses

abstract:
  The effect of non-zero c quark mass on b quark HQET Lagrangian, up to 1/m_b
level, is calculated at two loops. The results are expressed in terms of
dilogarithmic functions of m_c/m_b. This calculation involves on-shell two-loop
propagator-type diagrams with two different masses, m_b and m_c. A general
algorithm for reducing such Feynman integrals to the basis of two nontrivial
and two trivial integrals is constructed.


title: Scalar-Mediated Flavor-Changing Neutral Currents

abstract:
  The simplest extension of the standard model involves adding a scalar
doublet--the so-called two-Higgs model. In general, the additional scalar will
mediate tree-level flavor-changing neutral currents. Although one can
arbitrarily impose a discrete symmetry to avoid these, it isn't necessary to do
so; reasonable assumptions about the size of the flavor-changing couplings can
make them sufficiently small as to avoid problems in the kaon sector. However,
these same assumptions give much larger effects in the third-family case. We
discuss the model, the "reasonable assumptions" on the size of the couplings,
and examine phenomenological bounds on the couplings, showing that the most
promising signatures are from $B_s --> \mu\tau$, $\mu --> e\gamma$, etc. We
then include the newest result which shows potentially significant effects on
the anomalous magnetic moment of the muon.


title:
The general relation between the weak inclusive decays of bound and free
  heavy quarks

abstract:
  We derive a new parton formula for the inclusive B decays and briefly discuss
its applications to semileptonic and weak radiative decays of the B-meson.


title: Non-Perturbative QED and QCD at Finite Temperature

abstract:
  We present results of numerical solutions of Schwinger-Dyson equations for
the finite-temperature quark and electron propagators. It is shown that both
strongly coupled QED and QCD undergo a chiral symmetry restoring phase
transition as the temperature is increased. We go beyond the bare vertex or
"rainbow" approximation by applying the finite-temperature Ward-Takahashi
identity to constrain the non-perturbative vertex function.


title:
Hadronization mechanisms and longitudinal polarization of Lambda in e+e-
  annihilation at high energies

abstract:
  We suggested that longitudinal polarization of Lambda produced in e+e-
annihilation at LEP energies can provide useful information on hadronization
mechanism in general and on testing the validity of different pictures for the
spin content of baryon in describing the fragmentation process in particular.
We present the results obtained from the calculations based on two very much
different pictures.We compare the results with the recent ALEPH data and make
suggestions for future measurements.


title:
The electroweak pi^+ - pi^0 mass difference and weak matrix elements in
  the 1/Nc expansion

abstract:
  The pi^+ - pi^0 mass difference generated by the electroweak interactions of
the Standard Model is expressed, to lowest order in the chiral expansion and to
leading order in alpha, in terms of an integral involving the same correlation
function Pi_{LR}(Q^2) which governs the well known electromagnetic pi^+ - pi^0
mass difference. We calculate this contribution within the framework of QCD in
the limit of a large number of colours $N_c$. We show how this calculation,
which requires non-trivial contributions from next-to-leading terms in the 1/Nc
expansion, provides an excellent theoretical laboratory for studying issues of
long- and short-distance matching in calculations of weak matrix elements of
four-quark operators. The electroweak pi^+ - pi^0 mass difference turns out to
be a physical observable which is under good analytical control and which
should, therefore, be an excellent testground of numerical evaluations in
lattice-QCD and of model calculations in general.


title: Perturbative QCD Applied to Baryons

abstract:
  We review standard applications of perturbative QCD to baryon production, and
argue by examining data that it is generally relevant at high but
experimentally feasible momentum transfers. Then we consider some new
initiatives, particularly meson photoproduction off baryons and the seeming
quagmire of Delta(1232) electroproduction.


title: Models of Neutrino Masses from Oscillations with Maximal Mixing

abstract:
  We discuss models of neutrino masses that lead to a large mixing angle for
atmospheric neutrino oscillations. In particular we study a mechanism where a
simple texture for the Dirac matrix leads to the observed pattern of mixings
for a continuous range of Majorana matrices in a reasonably natural way. Both
nearly maximal and small mixing solutions for solar neutrinos are compatible
with this model. Possible dynamical realizations are discussed and a detailed
example in terms of horizontal U(1) charges is presented.


title: Tests of CPT and Lorentz Symmetry in Penning-Trap Experiments

abstract:
  This talk discusses the sensitivity of electron-positron and
proton-antiproton Penning-trap experiments to CPT- and Lorentz-violating
effects in the context of an extension of the minimal standard model and
quantum electrodynamics.


title: Unstable massive tau-neutrinos and primordial nucleosynthesis

abstract:
  The impact of unstable Majorana tau neutrinos on primordial nucleosynthesis
is considered. The mass and lifetime of nu_tau are taken in the intervals
0.1-20 MeV and 0.001-400 sec respectively. The studied decay modes are nu_tau
-> nu_mu + phi and nu_tau -> nu_e + phi, where phi is a massless (or light)
scalar. Integro-differential kinetic equations are solved numerically without
any simplifying assumptions. Our results deviate rather strongly from earlier
calculations. Depending on mass, lifetime, and decay channels of the nu_tau,
the number of effective neutrino species (found from He4), in addition to the 3
standard ones, varies from -2 to +2.5. The abundances of H2 and Li7 are also
calculated.


title: |Delta I|=3/2 Decays of the Omega^- in Chiral Perturbation Theory

abstract:
  We study the decays Omega^- -> Cascade+pion using heavy-baryon chiral
perturbation theory to quantify the |Delta I|=1/2 rule in these decay modes.
The ratio of |Delta I|=3/2 to |Delta I|=1/2 amplitudes is somewhat larger in
these decays than it is in other hyperon decays. At leading order there are two
operators responsible for the |Delta I|=3/2 parts of the Omega^- decays which
also contribute at one loop to other hyperon decays. These one-loop
contributions are sufficiently large to indicate (albeit not definitely) that
the measured width ratio of Omega^-->Cascade^0+pion^- to
Omega^-->Cascade^-+pion^0 = 2.7 may be too large.


title: Compton scattering by pion: there is no room for the off-shell effects

abstract:
  We show that the off-shell contributions in Compton scattering by pion may
exist only in the single exchange diagrams. These contributions are canceled
completely in the total gauge-invariant amplitude as it confirmed by one-loop
calculations. It explains, in particular, some results of the chiral
pertubation theory in the order $p^4$ but this cancelation has no relation to
chiral symmetry.


title: Strangeness Production Incorporating Chiral Symmetry

abstract:
  Chiral symmetry is known to be decisive for an understanding of the low
energy sector of strong interactions. It is thus important for a model of
relativistic heavy ion collisions to incorporate the dynamical breaking and
restoration of chiral symmetry. Thus we study an expansion scenario for a
quark-meson plasma using the Nambu--Jona-Lasinio (NJL) model in its three
flavor version. The equations of motion for light and strange quarks as well as
for pions, kaons and etas are solved using a QMD type algorithm, which is based
on a parametrization of the Wigner function. The scattering processes
incorporated into this calculation are of the types qq <--> qq, q\bar q <-->
q\bar q, q\bar q <--> MM and M <--> q\bar q.


title:
Right-handed neutrino mass and bottom-tau ratio in strong coupling
  unification

abstract:
  The recent results of neutrino experiments indicate the existence of the
right-handed neutrinos with masses around intermediate scale, which affects the
prediction of the bottom-tau mass ratio. In the minimal supersymmetric standard
model, this effect largely depends on the right-handed neutrino mass scale and
then may severely limit its lower bound. In this letter, we show that in the
case of strong coupling unification the bottom-tau mass ratio is little
affected by the presence of the right-handed neutrinos. This is because of the
infrared fixed-point behavior of Yukawa couplings, which is a common feature of
this kind of model.


title: Possible Nonstandard Effects in Z+Gamma Events at LEP2

abstract:
  We point out that the so--called 'radiative return' events at LEP2 are suited
to the study of nonstandard physics, particularly if the vector bosons are
emitted into the central detector region. An effective vertex is constructed
which contains the most general gauge invariant eeZGamma interaction and its
phenomenological consequences are examined. Low Energy Constraints on the
effective vertex are discussed as well.


title: Two Photon Reactions at High Energies

abstract:
  Cross sections for the reactions gamma^(*) gamma^(*) --> hadrons and
gamma^(*) gamma^(*) --> 2 vector mesons are calculated as functions of energy
(sqrt(s) > 20 GeV) and photon virtualities. Good agreement with experiment is
obtained for the total hadronic cross section and, after allowing for a
valence-quark contribution from the hadronic part of the photon, with the
photon structure function at small x. The cross section for vector meson
production are shown to be experimentally accessible for moderate values of
Q^2. This is sufficient to probe the nature of the hard pomeron which has
recently been proposed.


title:
Complete Helicity Decomposition of the B-t-tbar Vertex including Higher
  Order QCD Corrections and Applications to e+e- --> t tbar

abstract:
  The complete density matrix for all polarization configurations in the
process B--> t tbar, where B is an off--shell Z or photon and t is the top
quark, is calculated numerically including oneloop QCD corrections, i.e.
virtual and real gluon contributions in O(alphas). The analysis is done in the
framework of the helicity formalism. The results are particularly suited for
top quark production at the Linear Collider, but may be useful in other
circumstances as well. Relations to LEP and Tevatron physics are pointed out.


title: Development Strategies for Pythia version 7

abstract:
  This document describes the strategies for the development of the Pythia7
program. Both the internal and external structure of the program is discussed.
Some comments on relationship to other software is given as well as some
comments on coding conventions and other technical details.


title:
Non-Equilibrium Real-Time Dynamics of Quantum Fields: Linear and
  Non-Linear Relaxation in Scalar and Gauge Theories

abstract:
  The real time evolution of field condensates is solved for small and large
field amplitudes in scalar theories.For small amplitudes,the quantum equations
of motion for the condensate can be linearized and solved by Laplace transform.
The late time evolution turns to be determined by the singularities in the
complex plane (one-particle poles, two- and multi- particle cuts, Landau cuts
for non-zero initial temperature). In hot scalar electrodynamics, we solve the
real time evolution of field condensates with soft length scales \sim
k^{-1}>(eT)^{-1}. Transverse gauge invariant condensates relax as 1/t^2 to
amplitudes determined by the quasiparticle poles. We rederive the HTL action
using the non-equilibrium field theory techniques.In the nonlinear regime (for
large initial energy densities) we analyze the dynamics of dissipation and
relaxation in scalar theory after linear unstabilities are shut-off by the
quantum back-reaction. A new time scale emerges that separates the linear from
the non-linear regimes. This scale is non-perturbative in the coupling and
initial amplitude. A combination of numerical analysis and the implementation
of a dynamical renormalization group resummation via multi-time scale analysis
reveals the presence of unstable bands in the nonlinear regime. These are
associated with power law growth of quantum fluctuations, that result in power
law relaxation and dissipation with {\bf non-universal and non-perturbative
dynamical anomalous exponents.


title:
Distinctive effects in a model of dynamical electroweak symmetry
  breaking

abstract:
  The problem of possible deviations from the Standard Model is considered in
the framework of a variant of dynamical electroweak symmetry breaking. The
parameters of the theory are obtained, which describe deviations from SM in
$Z\to \bar b b$ decay, are also consistent with leptonic left-right asymertry
(SLAC data) and with the existence of a nontrivial solution for vertex $\bar t
(Z,\gamma) c$. The occurrence of this solution leads to a significant
enhancement in neutral flavor changing transition $t\to c$. The intensity of
this transition is connected with the $c$-quark mass, that leads to estimates
of probabilities of exotic decays $t\to c (Z,\gamma)$ (few %) and of the
cross-section of a single $t$-quark production in process $e^+e^-\to t \bar c$
at LEP2 ($\simeq 0.03 pb$ at $\sqrt{s} = 190 GeV$). The model is shown to be
consistent with the totality of the existing data; the predictions allow its
unambiguous check.


title: Baryogenesis through mixing of heavy Majorana neutrinos

abstract:
  We review the scenario of baryogenesis through leptogenesis induced by the
out-of-equilibrium decays of heavy neutrinos. We pay special attention to the
resonant phenomenon of CP violation through mixing of two nearly degenerate
heavy Majorana neutrinos and show how unitarity and CPT invariance is
maintained within the resummation approach. An important consequence of this is
that the leptogenesis scale may be as low as 1 TeV, even for models with
universal Yukawa couplings. We briefly discuss the impact of finite temperature
effects and low-energy constraints to the afore-mentioned mechanism of CP
violation.


title: The quark potential model for vector mesons and their decay constants

abstract:
  The relativistic quark potential model (QPM) is developed for
describingvector mesons and their leptonic decays. The new representation
Salpeter equation for vector mesons is proposed. Studying the $\tau\to\rho\nu$
decay theexpression for $\rho$-meson leptonic decay constant $f_\rho$
isobtained. It is shown that quark model describes on a satisfactory level both
theconstant $f_\rho$ and the masses of other charged vector mesons. Thevalues
for the leptonic decay constants of $K^{*},D^{*},D^{*}_s,B^{*},B^{*}_c$ mesons
are predicted.


title: Polarized Parton Distributions for Spin Asymmetries

abstract:
  We have used QCD and polarized deep-inelastic scattering data to construct
x-dependent polarized parton distributions. These flavor dependent
distributions evolve under the NLO DGLAP equations, satisfy positivity
constraints and agree well with the data. We perform all of the analysis in
x-space, avoiding difficulties with moments, and use these distributions to
predict spin observables. The small-x behavior is sensitive to the model for
the polarized gluon distribution.


title: Extracting chargino/neutralino mass parameters from physical observables

abstract:
  I report on two papers, hep-ph/9806279 and hep-ph/9807336, where
complementary strategies are proposed for the determination of the
chargino/neutralino sector parameters, $M_1, M_2, \mu $ and $\tan \beta$, from
the knowledge of some physical observables. This determination and the
occurrence of possible ambiguities are studied as far as possible analytically
within the context of the unconstrained MSSM, assuming however no CP-violation.


title: Virtual Next-to-Leading Corrections to the Lipatov Vertex

abstract:
  We compute the virtual next-to-leading corrections to the Lipatov vertex in
the helicity-amplitude formalism. These agree with previous results by Fadin
and collaborators, in the conventional dimensional-regularization scheme. We
discuss the choice of reggeization scale in order to minimize its impact on the
next-to-leading-logarithmic corrections to the BFKL equation.


title: Hot B violation, color conductivity, and log(1/alpha) effects

abstract:
  Bodeker has recently argued that non-perturbative processes in very high
temperature non-Abelian plasmas (such as electroweak baryon number violation in
the very hot early Universe) are logarithmically enhanced over previous
estimates and take place at a rate per unit volume of order $\alpha^5 T^4
\ln(1/\alpha)$ for small coupling. We give a simple physical interpretation of
Bodeker's qualitative and quantitative results in terms of Lenz's Law -- the
fact that conducting media resist changes in the magnetic field -- and earlier
authors' calculations of the color conductivity of such plasmas. In the
process, we resolve some confusions in the literature about the value of the
color conductivity and present an independent calculation. We also discuss the
issue of whether the classical effective theory proposed by Bodeker has a good
continuum limit.


title: Rates for non-perturbative processes in hot non-abelian plasma

abstract:
  [Talk given at "Continuous Advances in QCD '98."] I give a simple physical
picture of why the rate $\Gamma$ per unit volume of non-perturbative processes
in hot non-Abelian plasmas (such as electroweak baryon number violation in the
very early universe) depends on coupling as $\Gamma \sim \alpha^5 T^4
\ln(1/\alpha)$. The logarithmic dependence was recently discovered by Bodeker.


title: Characterizing Phases of the non-Abelian Coulomb Gas

abstract:
  The thermodynamic problem of a gas of static quarks carrying U(N) charges and
interacting with each other via U(N) electric gauge fields is formulated and
solved in the large N limit. In a lattice theory, the solution can be found in
any dimension. In particular, in 1+1-dimensions, the continuum model can also
be solved. In that case, and when the quarks are in the adjoint representation,
the explicit solution exhibits a first order quark confinement-deconfinement
transition at a critical temperature and density. We also show that, when there
are fundamental representation quarks, this phase transition persists until the
relative density of fundamental quarks is comparable to the density of adjoint
quarks, where it becomes a third order transition. We discuss the possible
interpretation of the third order transition as deconfinement.


title: Re-analysis of some bubble chamber data on $N \bar{N}$ annihilation

abstract:
  A re-analysis of some $\bar{p}p$ and $\bar{p}n$ data, at rest and in flight,
obtained in bubble chamber experiments, is presented. The ($\pi ^{+}\pi ^{-}$)
and ($K_{S}K_{S}$) final states for the channels (2$\pi ^{-}\pi ^{+}$) and
($K_{S}K_{S}\pi$) are investigated. Evidence for a narrow meson resonance
structure, cautiously suggested as $f_{0} (1500)$, is given. In the ($\pi
^{+}\pi ^{-}$) invariant mass distribution from $\bar{p}n$ annihilations in
flight, using the method of difference spectra, a very clear evidence for $\rho
^{0}, f_{2}(1270)$ and $f_{0} (1500)$ is first time obtained from these data.
  This re-analysis suggests that the old bubble chamber data can still provide
relevant information on the annihilation process in liquid hydrogen and
deuterium, and can elucidate controversial aspects of the annihilation
mechanism.


title: Evidence for Charge Symmetry Violation in Parton Distributions

abstract:
  By comparing structure functions measured in neutrino and charged lepton deep
inelastic scattering, one can test the validity of parton charge symmetry. New
experiments allow us to make such tests, which set rather tight upper limits on
parton charge symmetry violation [CSV] for intermediate Bjorken $x$, but which
appear to show sizable CSV effects at small $x$. We show that neither nuclear
shadowing nor contributions from strange and antistrange quark distributions
can account for the experimentally observed difference between the two
structure functions. We are therefore forced to consider the possibility of a
large CSV effect in the nucleon sea quark distributions. We discuss the
consequences of this effect for other observables, and we propose an experiment
which could detect a large CSV component in the nucleon sea.


title:
New effects observed in central production by the WA102 experiment at
  the CERN Omega Spectrometer

abstract:
  A study of central meson production as a function of the difference in
transverse momentum (dPT) of the exchanged particles shows that undisputed
qqbar mesons are suppressed at small dPT whereas the glueball candidates are
enhanced. In addition, the production cross section for different resonances
depends strongly on the azimuthal angle between the two outgoing protons.


title: Perturbative QCD analysis of exclusive $B$ meson decays

abstract:
  We review the perturbative QCD formalism for exclusive heavy meson decays,
concentrating on the three-scale factorization theorem for nonleptonic
processes. The formalism is then extended to the radiative decay $B\to
K^*\gamma$, which occurs through penguin diagrams. It is observed that the
contributions from the operators other than the penguin one $b\to s\gamma$ are
not negligible. From the best fit to the experimental data of the branching
ratio ${\cal B}(B\to K^*\gamma)$, we extract the $B$ meson wave function, which
possesses a sharp peak in the region with a small momentum fraction.


title: Q2 evolution of parton distributions at low x. Soft initial conditions

abstract:
  We investigate the Q2 evolution of parton distributions at small x values,
recently obtained in the case of soft initial conditions. The results are in
excellent agreement with deep inelastic scattering experimental data from HERA.


title:
The Q2 dependence of the measured asymmetry A1 from the similarity of
  g1(x,Q2) and F3(x,Q2) structure functions

abstract:
  We propose a new approach for taking into account the Q^2 dependence of
measured asymmetry A1. This approach is based on the similarity of the Q2
behaviour and the shape of the spin-dependent structure function g1(x,Q^2) and
spin averaged structure function F3(x,Q^2). The analysis is applied on
available experimental data.


title: On the $\Lambda^+_c$ -> p + K^- + $\pi^+$ decay

abstract:
  The proton energy spectrum and the angular distribution of the probability of
the $\Lambda^+_c$ -> p + $K^-$ + $\pi^+$ decay for the polarized $\Lambda^+_c$
and the unpolarized proton are calculated in the effective quark model with
chiral U(3) X U(3) symmetry incorporating Heavy Quark Effective theory (HQET)
and Chiral perturbation theory at the quark level (CHPT)$_q$. The application
of the obtained result to the analysis of the polarization of the $\Lambda^+_c$
produced in the processes of photo and hadroproduction is discussed. We draw
the similarity between the measurements of the polarization of the
$\Lambda^+_c$ in the $\Lambda^+_c$ -> p + $K^-$ + $\pi^+$ decay and the
$\mu^-$--meson in the $\mu^-$ -> $e^-$ + $\bar{\nu}_e$ + $\nu_{\mu}$ decay.


title:
Quark fragmentation and off-diagonal helicity density matrix elements
  for vector meson production

abstract:
  As confirmed by some recent LEP data on phi, K^* and D^*0 production, final
state interactions in quark fragmentation may give origin to non-zero values of
the off-diagonal element rho_{1,-1} of the helicity density matrix of vector
mesons produced in e^+ e^- annihilations: we give estimates for rho_{1,-1} of
vector mesons with a large x_E and collinear with the parent jet, relating its
size and sign to the associated hard constituent dynamics. We mention possible
non-zero values of rho_{1,-1} in several other processes.


title: Measuring the gluon spin in protons through $\eta'$ central production

abstract:
  The investigation of a proposed glueball filter in proton-proton collisions
led us to show that its action is in fact easily understood in terms of
kinematics. While the procedure proposed stays of interest in reducing
background when lookingfor centrally produced resonances of specified spin and
parity, we stress that it can be put to advantage in giving access to the
polarization of gluons in the inital protons


title:
Single spin asymmetries in polarized proton-proton, polarized
  antiproton-proton inclusive processes

abstract:
  Single spin asymmetries in polarized proton(antiproton) + proton -> pion + X
have been measured to be large. They can be understood within perturbative QCD
by introducing new k_perp and spin dependences in fragmentation and/or
distribution functions. We discuss first how these effects in distribution
functions alone can account for existing data and predict single spin
asymmetries in other processes; then we see how similar effects in
fragmentation functions alone can fit the existing data; finally we devise
strategies to discriminate between the two contributions


title: A New Unified Evolution Equation

abstract:
  WE propose a new unified evolution equation for parton distribution functions
appropriate for both large and small Bjorken x. Compared with the Ciafaloni-
Catani-Fiorani-Marchesini equation, the cancellation of soft poles between
virtual and real gluon emissions is made explicitly without introducing
infrared cutoffs, next-to-leading contributions to the Sudakov resummation can
be included systematically, and the scales of the running coupling constants
are determined unambiguously.


title: Non-Abelian Q-balls in Supersymmetric Theories

abstract:
  We demonstrate the existence of non-abelian non-topological solitons such as
Q-balls in the spectrum of Wess-Zumino models with non-abelian global
symmetries. We conveniently name them Q-superballs and identify them for short
as Q-sballs. More specifically, we show that in contrast to the
non-supersymmetric case, they arise in renormalizable potentials with cubic
self-interactions of only one dimensionful parameter and for the entire
parameter space of the model available. We solve the field equations and
present the explicit form of the Q-sball solution. We compute its main physical
properties and observe that in the supersymmetrically invariant vacuum Q-sballs
form domains of manifestly broken sypersymmetry.


title:
Atmospheric neutrino data : Active-Active $\times$ Active-Sterile
  oscillations

abstract:
  I summarize here the results of a global fit to the full data set
corresponding to 33.0 kt-yr of data of the Super-Kamiokande experiment as well
as to all other experiments in order to compare the active-active and
active-sterile neutrinos oscillation channels to the atmospheric neutrino
anomaly.


title: Report of the GDR working group on the R-parity violation

abstract:
  This report summarizes the work of the "R-parity violation group" of the
French Research Network (GDR) in Supersymmetry, concerning the physics of
supersymmetric models without conservation of R-parity at HERA, LEP, Tevatron
and LHC and limits on R-parity violating couplings from various processes. The
report includes a discussion of the recent searches at the HERA experiment,
prospects for new experiments, a review of the existing limits, and also
theoretically motivated alternatives to R-parity and a brief discussion on the
implications of R-parity violation on the neutrino masses.


title: On neutrino masses and leptonic mixing

abstract:
  Using recent data on neutrino oscillations, we argue that a hierarchical
solution for neutrino masses in a three-family context is possible, and that
the masses of the tau and mu neutrinos are very nearly determined within that
possibility. We also examine the predictions of a model that determines
neutrino and charged lepton mass matrices as well as its consistency with data.


title: CP-Violation in the Top Sector

abstract:
  We discuss the prospects - within several models - for the observation of
CP-violation (CPV) in top decays and production. The outlook looks best for t
-> bW at the LHC (MSSM CPV), t -> b \tau \nu_\tau at TeV3, LHC and NLC (H^+
CPV), p p-bar -> t b-bar + X at TeV3 (MSSM CPV), p p -> t t-bar + X at the LHC
(MSSM CPV and neutral Higgs CPV) and for e^+ e^- -> t t-bar h, t t-bar Z, where
h is the lowest mass neutral Higgs boson, at an NLC with energy \geq 1 TeV
(neutral Higgs CPV).


title: Power Counting and \beta Function in NRQCD

abstract:
  A computation of the NRQCD $\beta$ function both in the Lorentz gauge family
and in the Coulomb gauge to one loop order endorses a velocity power counting
scheme for dimensionally regularised NRQCD. In addition to the ultrasoft scale
represented by bremsstrahlung gluons and the potential scale with Coulomb
gluons and on-shell quarks, a soft r\'egime is identified in which energies and
momenta are of order $Mv$, gluons are on shell and the quark propagator becomes
static. The instantaneous gluon propagator has a non-zero vacuum polarisation
only because of contributions from this r\'egime, irrespective of the gauge
chosen. Rules are derived which allow one to read up from a given graph whether
it is zero because of the homogene{\ia}ty of dimensional regularisation. They
also apply to threshold expansion and are used to prove that ultrasoft quarks
with energy and momentum of order $Mv^2$ decouple from the theory.


title: The Soft R\'egime and \beta Function of NRQCD

abstract:
  Progress towards a complete velocity power counting in non-relativistic
effective field theories, especially NRQCD, is motivated and summarised.


title: Diffractive Production at Collider Energies and Factorization

abstract:
  The most important consequence of Pomeron being a pole is the factorization
property. However, due to Pomeron intercept being greater than 1, the
extrapolated single diffraction dissociation cross section based on a classical
triple-Pomeron formula is too large leading to a potential unitarity violation
at Tevatron energies, which has been referred to as "Dino's paradox". We review
our resolution which involves a proper implementation of final-state screening
correction, with "flavoring" for Pomeron as the primary dynamical mechanism for
setting the relevant energy scale. In this approach, factorization remains
intact, and unambiguous predictions for double Pomeron exchange, doubly
diffraction dissociation, etc., both at Tevatron and at LHC energies, can be
made.


title: New Mesons in the Chirally Symmetric Plasma

abstract:
  A nonperturbative proof is given that the chirally-invariant quark propagator
contains both particle and hole singularities with different dispersion
relations. Mesons made of a quark and a hole will produce dilepton pairs at
masses characteristic of the plasma and with a distinct energy dependence.


title: Testing a CPT- and Lorentz-Violating Extension of the Standard Model

abstract:
  A brief summary is given of recent developments concerning a
Lorentz-violating extension of the standard model and its implications for
experiments testing Lorentz and CPT symmetry.


title: Lessons from B -> X_s gamma in Two Higgs Doublet Models

abstract:
  The next--to--leading order predictions for the branching ratio BR(B -> X_s
gamma) are given in a generalized class of two Higgs doublets models. Included
are the recently calculated leading QED corrections. It is shown that the high
accuracy of the Standard Model calculation is in general not shared by these
models. Updated lower limits on the mass of the charged Higgs boson in Two
Higgs Doublet Models of Type II are presented.


title: Harmonic Sums and Mellin Transforms up to two-loop Order

abstract:
  A systematic study is performed on the finite harmonic sums up to level four.
These sums form the general basis for the Mellin transforms of all individual
functions $f_i(x)$ of the momentum fraction $x$ emerging in the quantities of
massless QED and QCD up to two--loop order, as the unpolarized and polarized
splitting functions, coefficient functions, and hard scattering cross sections
for space and time-like momentum transfer. The finite harmonic sums are
calculated explicitly in the linear representation. Algebraic relations
connecting these sums are derived to obtain representations based on a reduced
set of basic functions. The Mellin transforms of all the corresponding Nielsen
functions are calculated.


title:
Determining $M_1, M_2, \mu$ and $\tan\beta$ in MSSM from Chargino and
  Neutralino Masses

abstract:
  This paper has been withdrawn by the author(s), due a crucial sign error in
Eqn. 1.


title:
Radiative decays of heavy hadrons from light cone QCD sum rules in the
  leading order of HQET

abstract:
  The radiative decays of heavy baryons and lowest three doublets of heavy
mesons are studied with the light cone QCD sum rules in the leading order of
heavy quark effective theory.


title:
Radiative Shift of the Quark Mass in a Constant Chromomagnetic Field at
  Finite Temperature and Density

abstract:
  The radiation shift of the quark mass in a constant chromomagnetic field at
finite temperature and density was calculated. The limiting cases of a weak and
a strong chromomagnetic field were considered. It was shown that in a strong
field there is no imaginary part in the contribution of the finite density
effects to the quark mass shift, and its real part can considerably exceed the
corresponding part of the purely field contribution.


title: Pseudoscalar and scalar meson masses at finite temperature

abstract:
  The composite operator formalism is applied to QCD at finite temperature to
calculate the masses of scalar and pseudoscalar mesons. In particular the ratio
of the sigma mass to the pion mass is an interesting measure of the degree of
chiral symmetry breaking at different temperatures. We calculate the
temperature T* at which M_sigma(T) < 2M_pi(T), above which the sigma partial
width into two pions vanishes. We find T*=0.95T_c (where T_c is the critical
temperature for the chiral phase transition), within the full effective
potential given by the formalism. We find that an expansion a-la Landau of the
effective potential around the critical point in the limit of small quark mass
provides for a very good determination of T*.


title: Soft dilepton production and hard thermal loops

abstract:
  The Hard Thermal Loop expansion, is an attractive theory, but it reveals
difficulties when one uses it as a perturbative scheme. To illustrate this we
use the HTL expansion to calculate the two loop corrections for soft virtual
photons. The resulting corrections are of the same order as the 1-loop
correction.


title: Baryogenesis through lepton number violation

abstract:
  The most promising scenarios of baryogenesis seems to be the one through
lepton number violation. Lepton number violation through a Majarana mass of the
right-handed neutrinos can generate a lepton asymmetry of the universe when the
right-handed neutrinos decay. The left-handed neutrinos get small Majorana
masses through see-saw mechanism in these models. A triplet higgs scalar
violating lepton number explicitly through its couplings to two leptons or two
higgs doublets can also naturally give small Majorana masses to the left-handed
neutrinos and also generate a lepton asymmetry of the universe. We review both
these models of leptogenesis, where the lepton number asymmetry then gets
converted to a baryon asymmetry of the universe before the electroweak phase
transition.


title:
Ratio of productions of pi+pi-atoms to free pi+pi- pairs with account of
  the strong interaction in final states

abstract:
  The ratio of productions of pi+pi- atoms to free pi+pi- pairs is calculated
with account of the strong interaction in final states. It is shown that this
ratio is expressed via a squared ratio of the well-known Coulomb wave functions
and thus can be calculated with a high accuracy.


title:
Opposite-sign Dilepton Asymmetry of Neutral B Decays: a Probe of New
  Physics from CPT or \Delta B = \Delta Q Violation

abstract:
  We show that new physics, either from CPT violation in B^0-\bar{B}^0 mixing
or from \Delta B = -\Delta Q transitions, may lead to an opposite-sign dilepton
asymmetry of neutral B-meson decays. Both effects have the same time-dependent
behavior and therefore are in general indistinguishable from each other. We
also clarify some ambiguity associated with the constraint on CPT violation in
semileptonic decays of incoherent B^0 and \bar{B}^0 mesons.


title:
Sum Rules for Total Interaction Cross Sections of Relativistic
  Elementary Atoms with Atoms of Matter Up to Terms of Order $\alpha^2$

abstract:
  It is shown that $\alpha^2$-term of sum rules for the total cross sections of
interaction of elementary atoms with matter ones, obtained in ref.[Denisenko K.
and Mrowczynski S., Phys. Rev. D36 (1987) 1529] is wrong. New sum rules valid
up to terms of order $\alpha^2$ are derived.


title:
The Influence of Strong Interaction on the Pionium Wave Functions at
  Small Distances

abstract:
  The influence of strong $\pi^+\pi^-$ interaction of the behaviour of pionium
nS-state wave functions at small distance are investigated both analytically
(perturbatively) and so numerically. It is shown that in the whole the
accounting of strong interaction results in multiplying of pure Coulomb pionium
wave functions by some function practically independent on value of principal
quantum number n. Due to this reason the n-independence of probability of
$\pi^+\pi^-$ atom production in nS-state remains the same as in case of pure
Coulomb $\pi^+\pi^-$ interaction


title: Lepton Number Violation in Top-Color Assisted Technicolor

abstract:
  We calculate the rates for lepton number violating processes via the exchange
of the Z' boson occuring in top-color assisted technicolor. The current
experimental limits on muon electron conversion in Ti nuclei allow for a mass
of the new gauge boson around 1 TeV and the magnitudes of the mixing angles
turn out to lie roughly between the analogous elements of the CKM matrix and
its square root.


title: NLO prediction for the photoproduction of the isolated photon at HERA

abstract:
  The NLO calculation of the DIC process with the isolated photon is presented
and the comparison is made with the other NLO calculation and with recent
measurement at HERA. The satisfactory agreement was found.


title: Isospin violation and the proton's neutral weak magnetic form factor

abstract:
  The effects of isospin violation on the neutral weak magnetic form factor of
the proton are studied using two-flavour chiral perturbation theory. The first
nonzero contributions appear at O(p^4) in the small-momentum expansion, and the
O(p^5) corrections are also calculated. The leading contributions from an
explicit Delta(1232) isomultiplet are included as well. At such a high order in
the chiral expansion, one might have expected a large number of unknown
parameters to contribute. However, it is found that no unknown parameters can
appear within loop diagrams, and a single tree-level counterterm at O(p^4) is
sufficient to absorb all divergences. The momentum dependence of the neutral
weak magnetic form factor is not affected by this counterterm.


title: The suppression of $\pi N N(1535)$ coupling in QCD

abstract:
  The light cone QCD sum rules are employed to calculate the $\pi N N(1535)$
coupling $g_{\pi N N^\ast}$. We study the two point correlation function of two
nucleon currents sandwiched between the vacuum and the pion state. The
contribution from the excited states and the continuum is subtracted cleanly
through double Borel transformation with respect to the nucleon and N(1535)
momenta, $p_1^2$, $p_2^2=(p-q)^2$. Our calculation shows that the $\pi N
N(1535)$ coupling is strongly suppressed.


title:
Self-consistent Study on Color Transport in the Quark Gluon Plasma at
  Finite Chemical Potential

abstract:
  We calculate the relaxation time self-consistently to study the damping of
collective color modes and the color conductivity in a QGP by deriving
self-consistent equations for the damping rates of gluons and quarks to leading
order QCD by TFD including a chemical potential for quarks. We show that the
damping rates are not sensitive to the chemical potential whereas color
conductivity is enhanced considerably.


title:
Naturally Light Sterile Neutrinos in Gauge Mediated Supersymmetry
  Breaking

abstract:
  Moduli are generic in string (M) theory. In a large class of gauge-mediated
Supersymmetry breaking models, the fermionic components of such fields have
very light masses, around the eV scale, and non-negligible mixing with active
neutrinos, of order $10^{-4}$. Consequently, these fermions could play the role
of sterile neutrinos to which active neutrinos oscillate, thus affecting
measurements of solar neutrinos or of atmospheric neutrinos. They could also
provide warm dark matter, thus affecting structure formation.


title:
Heavy flavour mass corrections to the longitudinal and transverse cross
  sections in e^+e^- - collisions

abstract:
  The sentence, 7th line below Eq. (28), starting with "Further we exclude all
interference terms ...." is wrong and has been corrected. Eq. (33) :
f_k^{l,(i)} -> h_k^{l,(i)} i=0,1 Second line below Eq. (33) m_bar(m)=m is
replaced by m_bar(\mu_0)=\mu_0 with \mu_0=4.10 GeV and \mu_0=166.1 GeV for
bottom and top respectively. The numbers in the third column of tables 1 and 2
are a little bit changed.


title: Bottom quark mass from QCD sum rules for the Upsilon system

abstract:
  The talk presents an update of the bottom quark mass determination from QCD
moment sum rules for the Upsilon system by the authors. Employing the MS_bar
scheme, we find m_b(m_b) = 4.19 +- 0.06 GeV. The differences to our previous
analysis will be discussed and we comment on the determination of the pole mass
for the bottom quark.


title: A General Analysis of $\gamma$ Determinations from $B\to\pi K$ Decays

abstract:
  We present a general parametrization of $B^\pm\to\pi^\pm K, \pi^0K^\pm$ and
$B_d\to\pi^0 K, \pi^\mp K^\pm$ decays, taking into account both electroweak
penguin and rescattering effects. This formalism allows -- among other things
-- an improved implementation of the strategies that were recently proposed by
Neubert and Rosner to probe the CKM angle $\gamma$ with the help of
$B^\pm\to\pi^\pm K, \pi^0K^\pm$ decays. In particular, it allows us to
investigate the sensitivity of the extracted value of $\gamma$ to the basic
assumptions of their approach. We find that certain SU(3)-breaking effects may
have an important impact and emphasize that additional hadronic uncertainties
are due to rescattering processes. The latter can be controlled by using SU(3)
flavour symmetry arguments and additional experimental information provided by
$B^\pm\to K^\pm K$ modes. We propose a new strategy to probe the angle $\gamma$
with the help of the neutral decays $B_d\to\pi^0 K, \pi^\mp K^\pm$, which is
theoretically cleaner than the $B^\pm\to\pi^\pm K, \pi^0K^\pm$ approach. Here
rescattering processes can be taken into account by just measuring the
CP-violating observables of the decay $B_d\to\pi^0K_{\rm S}$. Finally, we point
out that an experimental analysis of $B_s\to K^+K^-$ modes would also be very
useful to probe the CKM angle $\gamma$, as well as electroweak penguins, and we
critically compare the virtues and weaknesses of the various approaches
discussed in this paper. As a by-product, we point out a strategy to include
the electroweak penguins in the determination of the CKM angle $\alpha$ from
$B\to\pi\pi$ decays.


title: String-mediated electroweak baryogenesis: a critical analysis

abstract:
  We study the scenario of electroweak baryogenesis mediated by
nonsuperconducting cosmic strings. This idea relies upon electroweak symmetry
being restored in a region around the core of the topological defect so that,
within this region, the rate of baryon number violation is enhanced. We compute
numerically how effectively baryon number is violated along a cosmic string, at
an epoch when the baryon number violation rate elsewhere is negligible. We show
that B-violation along nonsuperconducting strings is quite inefficient. When
proper accounting is taken of the velocity dependence of the baryon number
production by strings, it proves too small to explain the observed abundance by
at least ten orders of magnitude, whether the strings are in the friction
dominated or the scaling regime.


title: The Polarized Nucleon in Quark Models

abstract:
  A brief overview of various problems related to the description of a
polarized proton in quark models is presented. Structure functions are
discussed both for longitudinal and transverse polarization. A recently
introduced quantity, relevant in the study of single-spin asymmetries, is shown
to be in principle non-vanishing when computed in chiral models.


title:
Cancellation of 1/m_Q Corrections to the Inclusive Decay Width of a
  Heavy Quark

abstract:
  I review the cancellation of non-perturbative 1/m_Q corrections to the heavy
quark inclusive decay width. I summarize the results of an explicit second loop
order calculation in perturbation theory which shows the absence of linear
corrections when the decay width is expressed in terms of the short distance
mass.


title: Solving QCD Via Multi-Regge Theory

abstract:
  A high-energy, transverse momentum cut-off, solution of QCD is outlined.
Regge pole and ``single gluon'' properties of the pomeron are directly related
to the confinement and chiral symmetry breaking properties of the hadron
spectrum. This solution, which corresponds to a supercritical phase of Reggeon
Field Theory, may only be applicable to QCD with a very special quark content.


title: An effective theory for hot non-Abelian dynamics

abstract:
  I try to explain some recent progress in understanding the non-perturbative
dynamics of hot non-Abelian gauge theories. The non-perturbative physics is due
to soft spatial momenta $|\vec{p}|\sim g^2 T$ where $g$ is the gauge coupling
and $T$ is the temperature. An effective theory for the soft field modes is
obtained by integrating out the field modes with momenta of order $T$ and of
order $g T$ in a leading logarithmic approximation. In this effective theory
the time evolution of the soft fields is determined by a local Langevin-type
equation. This effective theory determines the parametric form of the rate for
hot electroweak baryon number violation as $\Gamma = \kappa g^{10} \log(1/g)
T^4$. The non-perturbative coefficient $\kappa$ is independent of the gauge
coupling and it can be computed by solving the effective equations of motion on
a lattice.


title: Phenomenological viability of string and M-theory scenarios

abstract:
  We analyze the constraints that a correct phenomenology and the absence of
dangerous charge and color breaking (CCB) minima or unbounded from below (UFB)
directions impose on the parameter space of different superstring and M-theory
scenarios. Namely, we analyze in detail the case where supersymmetry (SUSY)
breaking is driven by non-vanishing dilaton and/or moduli F-terms in weakly and
strongly coupled strings, and the specific case where the mechanism of SUSY
breaking is gaugino condensation with or without the participation of
non-perturbative contributions to the K{\"a}hler potential. The results
indicate that, only in some small windows of the parameter space all the
previous tests are succesfully passed. We also discuss the impact of
non-universality of the soft breaking terms on CCB/UFB bounds.


title: Predictions for SUSY Particle Masses from Electroweak Baryogenesis

abstract:
  In collaboration with G.D. Moore, the electroweak phase transition in the
minimal supersymmetric standard model is studied using the two-loop effective
potential. We make a comprehensive search of the MSSM parameter space
consistent with electroweak baryogenesis, taking into account various factors:
the latest experimental constraints on the Higgs boson mass and the rho
parameter, the possibility of significant squark and Higgs boson mixing, and
the exact rate of bubble nucleation and sphaleron transitions. Most of the
baryogenesis-allowed regions of parameter space will be probed by LEP 200,
hence the Higgs boson is likely to be discovered soon if the baryon asymmetry
was indeed created during the electroweak phase transition.


title: Naive Drell-Yan and Its Successor

abstract:
  We review the development in the field of lepton pair production since
proposing parton-antiparton annihilation as the mechanism of massive lepton
pair production. The basic physical picture of the Drell-Yan model has survived
the test of QCD, and the predictions from the QCD improved version have been
confirmed by the numerous experiments performed in the last three decades. The
model has provided an active theoretical arena for studying infrared and
collinear divergences in QCD. It is now so well understood theoretically that
it has become a powerful tool for new phyiscs information such as precision
measurements of the W mass and lepton and quark sizes.


title: CPT and Lorentz Tests in Hydrogen and Antihydrogen

abstract:
  Signals for CPT and Lorentz violation at the Planck scale may arise in
hydrogen and antihydrogen spectroscopy. We show that certain 1S-2S and
hyperfine transitions can exhibit theoretically detectable effects unsuppressed
by any power of the fine-structure constant.


title: Spin Physics and Polarized Structure Functions

abstract:
  A review on the theoretical aspects and the experimental results of polarized
deep inelastic scattering and of other hard scattering processes is presented.
The following items are discussed: longitudinally polarized structure
functions, results from the SLAC and CERN polarization experiments, the QCD
interpretation and the LO and NLO Q2-evolution of g1, the role of the polarized
gluon density, the expectations for x-->0, sum rules, the first moment of the
polarized structure function, the parametrizations of polarized parton
densities, polarized jet, heavy quark and direct photon production, DIS
semi-inclusive asymmetries and elastic neutrino-proton scattering, single and
double spin asymmetries, structure functions for higher spin hadrons and
nuclei, nonperturbative approaches, the transverse structure function g2,
chiral-odd 'transversity' distributions.


title: Heavy-heavy form factors and generalized factorization

abstract:
  We reanalyze B -> D pi and B -> K J/psi data to extract a set of parameters
which give the relevant hadronic matrix elements in terms of factorized
amplitudes. Various sources of theoretical uncertainties are studied, in
particular those depending on the model adopted for the form factors. We find
that the fit to the B -> D pi branching ratios substantially depends on the
model describing the Isgur-Wise function and on the value of its slope. This
dependence can be reduced by substituting the BR(B -> D pi) with suitable
ratios of non-leptonic to differential semileptonic BRs. In this way, we obtain
a model-independent determination of these parameters. Using these results, the
B -> D form factors at q^2=M_pi^2 can be extracted from a fit of the BR(B -> D
pi). The comparison between the form factors obtained in this way and the
corresponding measurements in semileptonic decays can be used as a test of
(generalized) factorization free from the uncertainties due to heavy-heavy form
factor modeling. Finally, we present predictions for yet-unmeasured D pi and D
K branching ratios and extract f_{D_s} and f_{D_s^*} from B -> DD_s decays. We
find f_{D_s} = 270 +- 45 MeV and f_{D_s^*}=260 +- 40 MeV, in good agreement
with recent measurements and lattice calculations.


title:
Is bi-maximal mixing compatible with the large angle MSW solution of the
  solar neutrino problem?

abstract:
  It is shown that the large angle MSW solution of the solar neutrino problem
with a bi-maximal neutrino mixing matrix implies an energy-independent
suppression of the solar nu_e flux. The present solar neutrino data exclude
this solution of the solar neutrino problem at 99.6% CL.


title: The Higgs Sector of the Minimal 3 3 1 Model Revisited

abstract:
  The mass spectrum and the eigenstates of the Higgs sector of the minimal 3 3
1 model are revisited in detail. There are discrepancies between our results
and previous results by another author.


title: CPT and Lorentz Tests in the Standard Model

abstract:
  A general Lorentz-violating extension of the minimal SU(3) x SU(2) x U(1)
standard model is described, including both CPT-even and CPT-odd terms. Some
theoretical properties and experimental implications are given. The extension
can be regarded as a low-energy limit of a physically relevant
Lorentz-covariant fundamental theory in which spontaneous Lorentz violation
occurs.


title:
Evolution of non-forward parton distributions in next-to-leading order:
  singlet sector

abstract:
  We present a general method for the solution of the renormalization group
equations for the non-forward parton distributions on the two-loop level in the
flavour singlet channel based on an orthogonal polynomial reconstruction. Using
this formalism we study the effects of the evolution on recently proposed model
distribution functions.


title: Chiral dynamics - status and perspectives

abstract:
  I review the status of chiral perturbation theory in the one-nucleon sector
and give some predictions to be tested. I then discuss various methods to go to
higher energies (inclusion of the Delta(1232), dispersion relations) and also
to higher precision (virtual photons and isospin violation).


title: New Interactions in Neutral Current Processes

abstract:
  Measurements of neutral current processes off the $Z$-peak are sensitive
probes of new interactions, which may be induced by the exchange of new
particles such as leptoquarks or extra $Z$'s. This talk reviews the
phenomenology of extra interactions in four-fermion processes and updates a
global fit to contact terms in the neutral current sector.


title:
Classical Kinetic Theory of Landau Damping for Self-interacting Scalar
  Fields in the Broken Phase

abstract:
  The classical kinetic theory of one-component self-interacting scalar fields
is formulated in the broken symmetry phase and applied to the phenomenon of
Landau damping. The domain of validity of the classical approach is found by
comparing with the result of a 1-loop quantum calculation.


title: SUSY Dark Matter: Direct Searches vs. Collider Experiments

abstract:
  The lightest neutralino in supersymmetric models with conserved R-parity is
an attractive candidate for non-luminous matter in the universe. If relic
neutralinos are indeed present as dark matter in our galaxy, they can be
directly detected in scattering experiments. This could serve as an independent
search channel for supersymmetry complementary to collider experiments. I
compare the sensitivity of direct detection experiments with the reach for
supersymmetry at collider facilities in the framework of the minimal
supergravity model.


title: Baryogenesis in Models with a Low Quantum Gravity Scale

abstract:
  We make generic remarks about baryogenesis in models where the scale $M_s$ of
quantum gravity is much below the Planck scale. These correspond to M-theory
vacua with a large volume for the internal space. Baryogenesis is a challenge,
particularly for $M_s \lappeq 10^5$ GeV, because there is an upper bound on the
reheat temperature of the Universe, and because certain baryon number violating
operators must be suppressed. We discuss these constraints for different values
of $M_s$, and illustrate with a toy model the possibility of using horizontal
family symmetries to circumvent them.


title:
Signatures of Quark-Gluon-Plasma formation in high energy heavy-ion
  collisions: A critical review

abstract:
  A critical review on signatures of Quark-Gluon-Plasma formation is given and
the current (1998) experimental status is discussed. After giving an
introduction to the properties of QCD matter in both, equilibrium- and
non-equilibrium theories, we focus on observables which may yield experimental
evidence for QGP formation. For each individual observable the discussion is
divided into three sections: first the connection between the respective
observable and QGP formation in terms of the underlying theoretical concepts is
given, then the relevant experimental results are reviewed and finally the
current status concerning the interpretation of both, theory and experiment, is
discussed. A comprehensive summary including an outlook towards RHIC is given
in the final section.


title: The Scalar Sector in 331 Models

abstract:
  We calculate the exact tree-level scalar mass matrices resulting from
symmetry breaking using the most general gauge-invariant scalar potential of
the 331 model, both with and without the condition that lepton number is
conserved. Physical masses are also obtained in some cases, as well as
couplings to standard and exotic gauge bosons.


title:
Two-loop anomalous dimensions for currents of baryons with two heavy
  quarks in NRQCD

abstract:
  We present analytical results on the two-loop anomalous dimensions of
currents for baryons, containing two heavy quarks $J = [Q^{iT}C\Gamma\tau
Q^j]\Gamma' q^k\epsilon_{ijk}$ with arbitrary Dirac matrices $\Gamma$ and
$\Gamma'$ in the framework of NRQCD in the leading order over both the relative
velocity of heavy quarks and the inverse heavy quark mass. It is shown, that in
this approximation the anomalous dimensions do not depend on the Dirac
structure of the current under consideration.


title:
Valence quark annihilation effect on charmed meson production in pi N
  collisions

abstract:
  We discuss the hadroproduction of charmed mesons in the framework of the
constituent cascade model taking into account the valence quark annihilation.
It is shown that the small valence quark annihilation process dominates the
leading particle production at large Feynman x and explains the recent
experimental data on the asymmetry between D^0 and D^0 bar at 350 GeV/c.


title:
A Dynamic Solar Core Model: On the Activity-Related Changes of the
  Neutrino Fluxes

abstract:
  The energy sources of the Sun may actually involve a thermonuclear runaway
energy source present in stellar energy producing regions. I consider the
conjectures of the derived model for the solar neutrino fluxes in case of a
solar core allowed to vary in relation to the surface activity cycle. The
observed neutrino flux data suggest a solar core possibly varying in time. In
the dynamic solar model the quiet and runaway energy sources together may
produce quasi-constant flux in the SuperKamiokande because it is sensitive to
neutral currents, axions and anti-neutrinos, too. I calculate the contributions
of the runaway source to the individual neutrino detectors. The results of the
dynamic solar core model suggest that since the HOMESTAKE detects mostly the
high energy electron neutrinos, therefore the HOMESTAKE data may aniticorrelate
with the activity cycle. Activity correlated changes are expected to be present
only marginally in the GALLEX and GNO data. The gallium detectors are sensitive
mostly to the pp neutrinos, and the changes of the pp neutrinos arising from
the SSM-like core is mostly compensated by the high-energy electron neutrinos
produced by the hot bubbles of the dynamic energy source. The results suggest
that the GALLEX data may show an anti-correlation, while the SuperKamiokande
data may show a correlation with the activity cycle. Predictions of the dynamic
solar model are presented for the SNO and Borexino experiments which can
distinguish between the effects of the MSW mechanism and the consequences of
the dynamic solar model. The results of the dynamic solar model are consistent
with the present heioseismic measurements and can be checked with future
heioseismic measurements as well.
  Keywords: solar neutrino problems - solar activity - thermonuclear runaways


title: Jet Rates in Deep Inelastic Scattering at Small $x$

abstract:
  The recent results of Forshaw and Sabio Vera on small-$x$ jet rates to order
$\alpha_s^3$ are extended to all orders, for any number of jets. A simple
generating function is obtained.


title:
Testing CPT and Lorentz Symmetry with Electrons and Positrons in Penning
  Traps

abstract:
  We present a theoretical analysis of signals for CPT and Lorentz violation in
g-2 and charge-to-mass-ratio experiments on electrons and positrons in Penning
traps. Experiments measuring anomaly frequencies are found to be the most
sensitive to CPT violation. We find that the conventional figure of merit for
CPT breaking, involving the difference of the electron and positron g factors,
is inappropriate in this context, and an alternative is introduced. Bounds of
approximately one part in 10^{20} are attainable.


title:
The Indirect Limit on the Standard Model Higgs Boson Mass from the
  Precision FERMILAB, LEP and SLD Data

abstract:
  Standard Model fits are performed on the most recent leptonic and b quark Z
decay data from LEP and SLD, and FERMILAB data on top quark production, to
obtain $m_t$ and $m_H$. Poor fits are obtained, with confidence levels $\simeq$
2%. Removing the b quark data improves markedly the quality of the fits and
reduces the 95% CL upper limit on $m_H$ by $\simeq$ 50 GeV.


title: Higgs Boson Production and Decay at the Tevatron

abstract:
  The theoretical status of Higgs boson production and decay at the Tevatron
within the Standard Model and its minimal supersymmetric extension is reviewed.
The focus will be on the evaluation of higher-order corrections to the
production cross sections and their phenomenological implications.


title: SUSY Particle Production at the Tevatron

abstract:
  The calculation of the next-to-leading order SUSY-QCD corrections to the
production of squarks, gluinos and gauginos at the Tevatron is reviewed. The
NLO corrections stabilize the theoretical predictions of the various production
cross sections significantly and lead to sizeable enhancements of the most
relevant cross sections for scales near the average mass of the produced
massive particles. We discuss the phenomenological consequences of the results
on present and future experimental analyses.


title: U(1) textures and Lepton Flavor Violation

abstract:
  U(1) family symmetries have led to successful predictions of the fermion mass
spectrum and the mixing angles of the hadronic sector. In the context of the
supersymmetric unified theories, they further imply a non-trivial mass
structure for the scalar partners, giving rise to new sources of flavor
violation. In the present work, lepton flavor non-conserving processes are
examined in the context of the minimal supersymmetric standard model augmented
by a U(1)-family symmetry. We calculate the mixing effects on the \mu-> e\gamma
and \tau -> \mu\gamma rare decays. All supersymmetric scalar masses involved in
the processes are determined at low energies using two loop renormalization
group analysis and threshold corrections. Further, various novel effects are
considered and found to have important impact on the branching ratios. Thus, a
rather interesting result is that when the see-saw mechanism is applied in the
(12 X 12)-sneutrino mass matrix, the mixing effects of the Dirac matrix in the
effective light sneutrino sector are canceled at first order. In this class of
models and for the case that soft term mixing is already present at the GUT
scale, tau -> \mu \gamma decays are mostly expected to arise at rates
significantly smaller than the current experimental limits. On the other hand,
the $\mu \ra e \gamma$ rare decays impose important bounds on the model
parameters, particularly on the supersymmetric scalar mass spectrum. In the
absence of soft term mixing at high energies, the predicted branching ratios
for rare decays are, as expected, well below the experimental bounds.


title: Power Corrections to Flavour-Singlet Structure Functions

abstract:
  We investigate the power-suppressed corrections to structure functions in
flavour singlet deep inelastic lepton scattering, to complement the previous
results for the non-singlet contribution. Our method is a dispersive approach
based on an analysis of Feynman graphs containing massive gluons; and our
results agree with those obtained from leading infrared renormalon
contributions. As in non-singlet deep inelastic scattering we find that the
leading corrections are proportional to 1/Q^2. We find that the singlet
contribution becomes important at small x.


title:
Confinement through a relativistic generalization of the linear
  interaction

abstract:
  Generalizing a covariant framework previously developed, it is shown that
confinement insures that meson $\to q+\bar{q}$ decay amplitudes vanish when
both quarks are on-shell. Regularization of singularities in a covariant linear
potential associated with nonzero energy transfers (i.e. $q^2=0, q^{\mu}\neq0$)
is improved.


title: Gaugino pair production at LHC (CMS)

abstract:
  We investigate \chi^{+/-}_1 \chi^0_2 pair production at LHC (CMS) with
subsequent decays into leptons for the case of nonuniversal gaugino masses.
Visibility of signal by an excess over SM background in 3l + no jets +
E^{miss}_T events depends rather strongly on the relation between LSP mass
\chi^0_1 and \chi^{+/-}_1 mass.


title: Improved Effective Action for Light Quarks Beyond Chiral Limit

abstract:
  We propose an improvement of the Diakonov-Petrov Effective Action on the
basis of the Lee-Bardeen results for the quark determinant in the instanton
field. This Improved Effective Action provides proper account of the current
quark masses, which is particularly important for strange quarks. This Action
is successfully tested by the calculations of the quark condensate, the masses
of the pseudoscalar meson octet and by axial-anomaly low-energy theorems.


title: Effect of Color Screening on Heavy Quarkonia Regge Trajectories

abstract:
  Using an unquenched lattice potential to calculate the spectrum of the
bottomonium system, we demonstrate numerically that the effect of pair creation
is to produce termination of hadronic Regge trajectories, in contrast to the
Veneziano model and the vast majority of phenomenological generalizations.
Termination of Regge trajectories may have significant experimental
consequences.


title: Charge and Colour Breaking in the Constrained MSSM

abstract:
  We show that the physical minimum of the Constrained MSSM is only free from
dangerous charge and colour breaking minima in the region of parameter space
bounded by 110< m_1/2< 400 GeV and 80< m_0< 170 GeV. In the remaining regions,
the cosmology is severely constrained.


title: The Advantages of Being Vectorlike

abstract:
  We construct an asymptotically free gauge theory with an SU(2)xSU(2)xU(1)
vectorlike flavor symmetry. We show that this gauge theory has properties which
provide insight into aspects of low-energy QCD.


title:
$\gamma \gamma\to \pi^0 \pi^0$ as a test for the existence of a light
  $\sigma$ meson

abstract:
  We work out predictions of the Linear Sigma Model for the $\gamma \gamma
\to\pi^0 \pi^0$ cross section. We consider the sigma width, which is introduced
in a consistent way with chiral Ward identities. The results of Chiral
Perturbation Theory are recovered in the $m_\sigma \to \infty$ limit. A fit to
existing experimental results is consistent with a light and broad $\sigma$
meson.


title:
Contribution of $b\to s gg$ through the QCD anomaly in exclusive decays
  $B \to (\eta',\eta) (K, K^{*})$

abstract:
  The charm content in $\eta'$ is estimated using the QCD U(1) axial anomaly
applied to $b\to s g g \to \eta' s$. We find $f_{\eta'}^{(c)} \approx - 3.1$
MeV for $m_c = 1.3$ GeV. Our estimate agrees with other independent methods by
Feldmann and Kroll, and Araki, Musakhanov and Toki. The resulting branching
ratios for $B \to \eta' K$ in the generalized factorization model are
marginally consistent with the CLEO data, although they are lower than the data
by $\sim 2$.


title: Counting defects in an instantaneous quench

abstract:
  The objective of this paper is to study the formation of defects in a non
equilibrium second order phase transition by means of a numerical solution of
the full dynamical equations, and to compare the results with theoretical
predictions to be found in the literature. We simulate an instantaneous quench
to zero temperature in a type II superconductor, measuring the actual density
of defects and its theoretically expected value as a function of time. We also
characterize quantitatively some aspects of the out of equilibrium phase
transition.


title: Historical and other Remarks on Hidden Symmetries

abstract:
  Apart from a few remarks on lattice systems with global or gauge symmetries,
most of this talk is devoted to some interesting ancient examples of symmetries
and their breakdowns in elasticity theory and hydrodynamics. Since Galois
Theory is in many ways the origin of group theory as a tool to analyse (hidden)
symmetries, a brief review of this profound mathematical theory is also given.


title: The light Higgs in supersymmetric models with Higgs triplets

abstract:
  In supersymmetric models the presence of Higgs triplets introduce new quartic
interactions for the doublets that may raise the mass of the lightest CP-even
field up to 205 GeV. We show that the complete effect of the triplets can be
understood by decoupling them from the minimal sector and then analyzing the
vacuum and the spectrum of the two-Higgs doublet model that results. We find
that the maximum value of m_h is only achieved in a very definite region of the
parameter space. In this region, however, radiative corrections decrease the
bound to 190 GeV.


title: Compton Scattering on Pion and Pion Polarizabilities

abstract:
  The Compton scattering on a charged pion is studied using the dispersion
relations. Unknown mass, full width and decay width into \gamma \gamma of the
sigma meson are found from a fit to the experimental data for the process
\gamma+\gamma \to \pi^0+\pi^0. These parameters are used for the calculation of
the cross section of the Compton scattering on the charged pion. The analysis
of the obtained results shows that the data on the elastic \gamma\pion
scattering in the energy region up to \sqrt{s}=1 GeV (together with the data on
process \gamma\gamma \to \pi^0\pi^0) could be used both for a determination of
the pion polarizability values with high precision and for research of the
sigma meson.


title: Electroweak Baryogenesis in a Left-Right Supersymmetric Model

abstract:
  The possibility of electroweak baryogenesis is considered within the
framework of a left-right supersymmetric model. It is shown that for a range of
parameters the large sneutrino VEV required for parity breaking varies at the
electroweak phase transition leading to a production of baryons. The resulting
baryon to entropy ratio is approximated to be ${n_B\over s}\sim \alpha 0.7
\times10^{-8}$, where $\alpha$ is the angle that the phase of sneutrino VEV
changes at the electroweak phase transition.


title: Strangeness counting in high energy collisions

abstract:
  The estimates of overall strange quark production in high energy e+e-, pp and
ppbar collisions by using the statistical-thermal model of hadronisation are
presented and compared with previous works. The parametrization of strangeness
suppression within the model is discussed. Interesting regularities emerge in
the strange/non-strange produced quark ratio which turns out to be fairly
constant in elementary collisions while it is twice as large in SPS heavy ion
collision.


title: Dileptonic decay of B_s meson in SUSY models with large tan\beta

abstract:
  We have added some some refrences & given some figures giving results in
parameter space allowed by b \to s \gamma. Conclusions more or less remains
unchanged.


title: Quark Lepton Mass Hierarchies and the Baryon Asymmetry

abstract:
  The mass hierarchies of quarks and charged leptons as well as a large
$\n_\m$-$\n_\t$ mixing angle are naturally explained by the Frogatt-Nielsen
mechanism with a nonparallel family structure of chiral charges. We extend this
mechanism to right-handed neutrinos. Their out-of-equilibrium decay generates a
cosmological baryon asymmetry whose size is quantized in powers of the
hierarchy parameter $\e^2$. For the simplest hierarchy pattern the neutrino
mass $\bar{m}_\n= (m_{\n_\m}m_{\n_\t})^{1/2} \sim 10^{-2}$ eV, which is
inferred from present indications for neutrino oscillations, implies a baryon
asymmetry $n_B/s \sim 10^{-10}$. The corresponding baryogenesis temperature is
$T_B \sim 10^{10}$ GeV.


title: A See-Saw Model for Atmospheric and Solar Neutrino Oscillations

abstract:
  We have constructed an explicit see-saw model containing two singlet
neutrinos, one carrying a $(B-3L_e)$ gauge charge with an intermediate mass
scale of $\sim O(10^{10})$ GeV along with a sterile one near the GUT (grand
unification theory) scale of $\sim O(10^{16})$ GeV. With these mass scales and
a reasonable range of Yukawa couplings, the model can naturally account for the
near-maximal mixing of atmospheric neutrino oscillations and the small mixing
matter-enhanced oscillation solution to the solar neutrino deficit.


title:
Testing CPT and Lorentz Symmetry with Protons and Antiprotons in Penning
  Traps

abstract:
  A theoretical analysis is performed of Penning-trap experiments comparing
protons and antiprotons to test CPT and Lorentz symmetry through measurements
of anomalous magnetic moments and charge-to-mass ratios. Possible CPT and
Lorentz violations arising at a fundamental level are treated in the context of
a general extension of the standard model of particle physics and its
restriction to quantum electrodynamics. In a suggested experiment measuring
anomaly frequencies a bound on CPT violation of 10^{-23} for a relevant figure
of merit is attainable. Experiments comparing cyclotron frequencies are
sensitive within this theoretical framework to different kinds of Lorentz
violation that preserve CPT. Constraints could be obtained on one figure of
merit at 10^{-24} and on another in a related experiment with H- ions and
antiprotons at the level of 10^{-25}.


title: Low energy limit of effective chiral theory of mesons

abstract:
  Based on an effective chiral theory of pseudoscalar, vector, and axial-vector
mesons, the coefficients of the chiral perturbation theory are predicted. There
is no new parameter in these predictions.


title: Nuclear bound states of $\omega$ mesons

abstract:
  Models based on chiral SU(3)_L \otimes SU(3)_R symmetry and vector meson
dominance suggest an attractive potential for the $\omega$-meson in a nuclear
medium. We discuss the feasibility of producing nuclear bound states of
$\omega$-mesons using $(d,^3He)$ and pion induced reactions on selected nuclear
targets.


title: The Sphaleron Rate: Bodeker's Leading Log

abstract:
  Bodeker has recently shown that the high temperature sphaleron rate, which
measures baryon number violation in the hot standard model, receives
logarithmic corrections to its leading parametric behavior; Gamma = kappa'
[log(m_D / g^2 T) + O(1)] (g^2 T^2 / m_D^2) \alpha_W^5 T^4. After discussing
the physical origin of these corrections, I compute the leading log coefficient
numerically; kappa' = 10.8 pm 0.7. The log is fairly small relative to the O(1)
``correction;'' so nonlogarithmic contributions dominate at realistic values of
the coupling.


title: Heavy quarks in non-relativistic lattice QCD

abstract:
  I give an overview of phenomenological heavy quark results obtained in NRQCD
on the lattice. In particular I discuss the bottomonium and the b-light hadron
spectrum. I also review recent results on the decay constants f_B and f_B_s.


title:
A New Doublet-Triplet Splitting Mechanism for Supersymmetric SO(10) and
  Implications for Fermion Masses

abstract:
  We present a new mechanism for doublet-triplet splitting in supersymmetric
SO(10) models using a missing vev pattern which is different from the one used
in the currently popular Dimopoulos-Wilczek method. In our method, the doublets
in a {$\bf 16,\bar{16}$} pair are the ones split from the rest of the multiplet
and are then mixed with the doublets from one or two {\bf 10}'s giving rise to
the doublets {$\bf H_u$} and {$\bf H_d$} of the standard model. This approach
provides a natural way to understand why top quark is so much heavier than the
bottom quark. It also enables us to generate both hierarchical and
nonhierarchical pattern for neutrino masses, the latter being of interest if
neutrino is the hot component of the dark matter of the universe. We construct
a simple, realistic model based on this idea. The model uses only simple
representations, has no unwanted flat directions and maintains coupling
constant unification as a prediction.


title: The Standard Model and Why We Believe It

abstract:
  The principle components of the Standard Model and the status of their
experimental verification are reviewed. Lectures given at TASI97:
Supersymmetry, Supergravity, and Supercolliders}, Boulder, CO, June 1997.


title:
Fermi spectra and their gauge invariance in hot and dense Abelian and
  non-Abelian theories

abstract:
  The one-loop Fermi spectra (one-particle and collective ones) are found for
all momenta in the $T^2$-approximation and their gauge invariance in hot and
dense Abelian and non-Abelian theories is studied. It is shown that the
one-particle spectrum, if the calculation accuracy is kept strictly, is gauge
invariant for all momenta and has two branches as the bare one. The collective
spectrum always has four branches which are gauge dependent including also
their $|\q|=0$ limit. The exception is the case $m,\mu=0$ for which this
spectrum is gauge invariant for all momenta as well.


title: Energy and momentum density of thermal gluon oscillations

abstract:
  In the exact propagator for finite temperature gluons the location of the
transverse and longitudinal poles in the gluon propagator are unknown functions
of wave vector: $\omega_{T}(k)$ and $\omega_{L}(k)$. The residues of the poles,
also unknown, fix the normalization of the one gluon vector potential and thus
of the field strength. The naive energy density
$\pol{E}\cdot\pol{D}+\pol{B}\cdot\pol{H}$ is not correct because of dispersion.
By keeping the modulations due to the source currents the energy density is
shown to be $\omega_{T}/V$ and $\omega_{L}/V$ regardless of the functional form
of $\omega_{T}(k)$ and $\omega_{L}(k)$. The momentum density is $k/V$. The
resulting energy-momentum tensor is not symmetric.


title:
Higgs Boson Production at Hadron Colliders with Soft Gluon Effects: I.
  Backgrounds

abstract:
  The gold-plated discovery mode of a Standard Model like Higgs boson at the
CERN Large Hadron Collider (LHC) is the H -> Z^0 Z^0 decay mode. To find and
then measure the properties of the Higgs, it is crucial to have the most
precise theoretical prediction both for the signal and the QCD background in
this mode. In this work we calculate the effects of the initial-state multiple
soft-gluon emission on the kinematic distributions of photon and Z^0 pairs
produced in hadron collisions. The Collins-Soper-Sterman formalism is extended
to resum the large logarithmic terms due to soft-gluons. The resummed total
rates, the invariant mass, transverse momentum, and rapidity distributions of
the photon and Z^0 pairs, and the transverse momentum distributions of the
individual vector bosons are presented and compared to the fixed order
predictions in the whole kinematic range, for the LHC energies and for the
upgraded Fermilab Tevatron. Our conclusion is that the resummed predictions
should be used when extracting the Higgs signal at the LHC.


title: Inflation with TeV-scale gravity

abstract:
  Allowing for the possibility of large extra dimensions, the fundamental
Planck scale $M$ could be anywhere in the range $\TeV\lsim M\lsim \mpl$, where
$\mpl=2.4\times 10^{18}\GeV$ is the four-dimensional Planck scale. If
$M\sim\TeV$, quantum corrections would not destabilize the Higgs mass even if
there were no supersymmetry. But we point out that supersymmetry must in fact
be present, if there is an era of cosmological inflation, since during such an
era the inflaton mass satisfies $m\ll M^2/\mpl=10^{-15}(M/\TeV)$ and
supersymmetry will be needed to protect it. If the inflation hypothesis is
accepted, there is no reason to think that Nature has chosen the low value
$M\sim \TeV$, however convenient that choice might have been for the next
generation of collider experiments.


title:
CP Violation in $\gamma \gamma \to t~\bar{t}$ within the Minimal
  Supersymmetric Standard Model

abstract:
  The complete analysis of the CP violation in the process $\gamma \gamma \to t
\bar{t}$ in frame of the Minimal Supersymmetric Model(MSSM) is presented. The
CP-odd observables for describing the CP violating effects in polarized and
unpolarized photon collisions, are calculated. We investigate the possible CP
violation sources induced by the complex soft breaking parameters and study the
CP violating effects contributed by gluino, neutralino and chargino sectors
appearing in the loop diagrams. We find that it is possible to observe the CP
violation effects in top quark pair production via polarized and unpolarized
photon fusions by using optimal observables and favorable parameters.


title: Lattice calculation of $\alpha_s$ in momentum scheme

abstract:
  We compute the flavorless running coupling constant of QCD from the three
gluon vertex in the (regularisation independent) momentum subtraction
renormalisation scheme. This is performed on the lattice with high statistics.
  The expected color dependence of the Green functions is verified. There are
significant $O(a^2\mu^2)$ effects which can be consistently controlled. Scaling
is demonstrated when the renormalisation scale is varied between 2.1 GeV and
3.85 GeV.
  Scaling when the lattice spacing is varied is very well satisfied. The
resulting flavorless conventional two loop $\Lambda^{(c)}_{\bar{MS}}$ is
estimated to be, respectively for the MOM and $\widetilde{MOM}$ scheme, 361(6)
MeV and 345(6) MeV, while the three loop results are, depending on $\beta_2:
\Lambda^{(3)}_{\bar{MS}} = (412 - 59 \frac{\beta_2} {\beta_{2, \bar{MS}}} \pm 6
MeV) $ and $\Lambda^{(3)}_{\bar{MS}} = (382- 46\frac{\beta_2} {\beta_{2,
\bar{MS}}}\pm 5 MeV) $. A preliminary computation of $\beta_2$ in the
$\widetilde{MOM}$ scheme leads to $\Lambda^{(3)}_{\bar{MS}} = 303(5)\frac
{a^{-1}(\beta=6.0)} {1.97 GeV}$ MeV.


title:
Bounds on anomalous gauge couplings from past and near future
  experiments: the role of the different measurements

abstract:
  We analyze the bounds on the set of four "non-blind" anomalous gauge
couplings that will be derived, in absence of deviations from the Standard
Model predictions, from near future measurements at LEP2 and at the TEVATRON.
The bounds are obtained by combining these negative results with those already
available from LEP1 and from atomic parity violation experiments. In this
process, the information coming from LEP2 is treated using a recently proposed
("Z-peak subtracted") theoretical approach. This makes it easier to identify
the specific role that the different experiments play in this determination, in
the spirit of a recent previous investigation for the set of three "blind"
couplings.


title: Mass-Shell Behavior of Electron Propagator at Low Temperature

abstract:
  At T=0 the full electron propagator is known to have an infrared anomalous
dimension and thus a branch point at $P^{2}=m^{2}$ rather than a pole. An
explicit calculation shows that if $0<eT\ll m$ the retarded self-energy is
analytic in the vicinity of $P^{2}\approx m^{2}$, which includes the thermal
mass-shell. The low-temperature propagator has a simple pole. Only when T=0 is
there a branch point at the mass-shell.


title: CP violating lepton asymmetries in Left-Right Models

abstract:
  Lepton charge asymmetries can be used as an alternative means of searching
for new physics. They are interesting because they are small in the Standard
Model and therefore, necessarily evidence new physics. In this work we explore
the use of lepton asymmetries as a probe of the flavour structure of the
left-right symmetric model with spontaneous CP violation. We find that new
physics may enhance the magnitude of $a_{SL}$ up to the precent level within
the appropiate parameter space.


title: Low $\tan{\beta}$ in the extended Minimal Gauge Mediated Model

abstract:
  We consider the Minimal Gauge Mediated Model (MGMM) with either fundamental
or antisymmetric messenger multiplets and study consequences of
messenger-matter mixing. It is shown that constraints on relevant coupling
constants and mixing parameters coming from the existing experimental limits on
lepton flavor violation and FCNC processes allow a wide range of $\tan\beta$ in
MGMM with mixing.


title:
Hydrogen and Antihydrogen Spectroscopy for Studies of CPT and Lorentz
  Symmetry

abstract:
  A theoretical study of possible signals for CPT and Lorentz violation arising
in hydrogen and antihydrogen spectroscopy is described. The analysis uses a
CPT- and Lorentz-violating extension of quantum electrodynamics, obtained from
a general Lorentz-violating extension of the minimal standard model with both
CPT-even and CPT-odd terms. Certain 1S-2S transitions and hyperfine Zeeman
lines exhibit effects at leading order in small CPT-violating couplings.


title: Degenerate and Quasi Degenerate Majorana Neutrinos

abstract:
  We study mixing and CP violation of three left-handed Majorana neutrinos in
the limit of exactly degenerate masses, identify the weak-basis invariant
relevant for CP violation and show that the leptonic mixing matrix is
parametrized only by two angles and one phase. After the lifting of the
degeneracy, this parametrization accommodates the present data on atmospheric
and solar neutrinos, as well as double beta decay. Some of the leptonic mixing
ansatze suggested in the literature correspond to special cases of this
parametrization.


title: New Results in the Physics of Neutrino Oscillations

abstract:
  I report on recent theoretical results about neutrino mixing and
oscillations. I show that in Quantum Field Theory, mixing transformations are
not trivial and the vacuum for the mixed fields has a condensate structure.
This fact has phenomenological consequences on neutrino oscillations: the
oscillation formula turns out to have an additional oscillating piece and
energy dependent amplitudes. The usual Pontecorvo formula is recovered in the
relativistic limit. I report also about preliminary results on the presence of
a topological (Berry) phase for oscillating neutrinos.