title: The nucleon in the chiral quark model: an alternative computation scheme

abstract:
  We formulate the quark sea contributions to the energy and various physical
observables in terms of Euclidean Green functions and their K-spin partial wave
reduction. In this framework it is not necessary to discretize the continuous
spectrum by introducing a finite boundary. Using this formulation we perform a
new self-consistent computation of the nucleon state in the Nambu-Jona-Lasinio
model. Besides this technical advantage such an alternative computation scheme
makes it possible to obtain the numerical predictions of the model in an
entirely independent way. We use the Pauli-Villars cutoff to define the model.
Our results for the nucleon energy, the mesonic profile, and various
observables essentially confirm results obtained by other groups using this
regularization. The results for $g\sub{A}$, obtained on the basis of quark
currents, are close to the experimental value.


title: Four jet event shapes in electron-positron annihilation

abstract:
  We report next-to-leading order perturbative QCD predictions of 4 jet event
shape variables for the process e+e- \to 4 jets obtained using the general
purpose Monte Carlo EERAD2. This program is based on the known `squared' one
loop matrix elements for the virtual \gamma^* \to 4 parton contribution and
squared matrix elements for 5 parton production. To combine the two distinct
final states numerically we present a hybrid of the commonly used subtraction
and slicing schemes based on the colour antenna structure of the final state
which can be readily applied to other processes. We have checked that the
numerical results obtained with EERAD2 are consistent with next-to-leading
order estimates of the distributions of previously determined four jet-like
event variables. We also report the next-to-leading order scale independent
coefficients for some previously uncalculated observables; the light hemisphere
mass, narrow jet broadening, Aplanarity and the 4 jet transition variables with
respect to the JADE and Geneva jet finding algorithms. For each of these
observables, the next-to-leading order corrections calculated at the physical
scale significantly increase the rate compared to leading order (the K factor
is approximately 1.5 -- 2). With the exception of the 4 jet transition
variables, the published DELPHI data lies well above the O(\alpha_s^3)
predictions. The renormalisation scale uncertainty is still large and in most
cases the data prefers a scale significantly smaller than the physical scale.
This situation is reminiscent of that for three jet shape variables, and should
be improved by the inclusion of power corrections and resummation of large
infrared logarithms.


title:
Proton-helium elastic scattering: a possible high-energy polarimeter at
  RHIC-BNL

abstract:
  We examine a suggestion to use ${p-} ^4{He}$ elastic scattering, as an
absolute polarimeter for high-energy polarized proton beams, by means of a
Coulomb-Nuclear Interference effect for the single-spin asymmetry $A_N(t)$,
around the diffractive minimum of the differential cross section $|t|\sim 0.21
GeV^2$. Although this reaction has a fairly simple dynamical structure, our
theoretical uncertainties and the present experimental inaccuracy of the
differential cross section in this $t$ region, allows one to generate dramatic
effects for $A_N(t)$, which will be discussed.


title: Applications of Perturbative NRQCD

abstract:
  We review the theoretical ideas and tools required to arrive at a
next-to-next-to-leading order (NNLO) description of the heavy quark-antiquark
production cross section in $e^+e^-$ annihilation for the case that the center
of mass kinetic energy of the quarks is larger than $\Lambda_{QCD}$. In this
case the NNLO cross section can be calculated with purely perturbative methods.
We present details of the calculation and discuss two applications, the
determination of the bottom quark mass from Upsilon sum rules and the
top-antitop production cross section close to threshold in $e^+e^-$
annihilation.


title:
Symmetry Tests within the Standard Model and Beyond from Nuclear Muon
  Capture

abstract:
  Precision measurements in nuclear muon capture on the proton and $^3$He allow
for tests of the Standard Model for the strong and electroweak interactions,
complementary to those achieved in high energy experiments. The present
situation and future prospects are reviewed, emphasizing where renewed efforts
could prove to be rewarding in exploring ever further beyond the confines of
the Standard Model.


title:
Non-perturbative computation of gluon mini-jet production in nuclear
  collisions at very high energies

abstract:
  At very high energies, in the infinite momentum frame and in light cone
gauge, a hard scale proportional to the high parton density arises in QCD. In
an effective theory of QCD at small $x$, this scale is of order $\alpha_S\mu$,
where $\mu$ is simply related to the gluon density at higher rapidities. The ab
initio real time evolution of small $x$ modes in a nuclear collision can be
described consistently in the classical effective theory and various features
of interest can be studied non-perturbatively. In this paper, we discuss
results from a real time lattice computation of the production of gluon jets at
very high energies. At very large transverse momenta, $k_t\geq \mu$, our
results match the predictions from pQCD based mini-jet calculations. Novel
non-perturbative behaviour of the small $x$ modes is seen at smaller momenta
$k_t\sim \alpha_S\mu$. Gauge invariant energy-energy correlators are used to
estimate energy distributions evolving in proper time.


title:
The eikonal approach to calculation of the multiphoton exchange
  contributions to the total cross sections of \pi^+pi^- atom interaction with
  ordinary atoms

abstract:
  The total cross sections of interaction of relativistic \pi^+\pi^- atom with
ordinary atoms are obtained in the eikonal approach, which takes into
consideration all multiphoton exchange processes. Contribution of these
processes strongly depends on the atom nucleus charge Z and varies from 1.5%
for Titanium (Z=22) to 14% for Tantalum (Z=73)


title: The universal properties of the electroweak phase transition

abstract:
  The first order electroweak phase transition in the Standard Model turns into
a regular cross-over at a critical Higgs mass m_{H,c} approximately 75 GeV. At
the critical point the transition is of second order. We make a detailed
investigation of the critical properties of the electroweak theory at the
critical point, and we find that the transition falls into the 3d Ising
universality class. The continuum limit extrapolation of the critical Higgs
mass is m_{H,c} = 72(2) GeV, which implies that there is no electroweak phase
transition in the Standard Model.


title: Confinement vs. screening in 3d (effective high T) gauge theories

abstract:
  The physics of electric and magnetic screening in non-Abelian finite
temperature field theory is closely related to the non-perturbative properties
of the corresponding three-dimensional effective theories which are confining.
I discuss recent lattice results obtained for the mass spectrum, string tension
and the static potential in SU(2) pure gauge theory and the SU(2) Higgs model
and their connection to screening masses. The non-perturbative $O(g_3^2)$
corrections to the Debye mass are evaluated.


title:
The Supersymmetric Flavor Problem for Heavy First-Two Generation Scalars
  at Next-to-Leading Order

abstract:
  We analyze in detail the constraints on SUSY-model parameters obtained from
K-Kbar mixing in the hypothesis of a splitted SUSY spectrum. FCNC contributions
from gluino-squark-quark interactions are studied in the so-called mass
insertion approximation. We present boundaries on mass insertions and on SUSY
mass scales. We improve previous results by including the NLO-QCD corrections
to Delta S=2 effective Hamiltonian and the complete set of B-parameters for the
evaluation of hadronic matrix elements.
  A full set of magic-numbers, that can be used for further analyses of these
models, is also given. We find that the inclusion of NLO-QCD corrections and
the B-parameters change the results obtained at LO and in the Vacuum Insertion
Approximation by an amount of about 25-35%.


title: Addendum to: 2HDMs predictions for $B \to X_s \gamma$ in NLO QCD

abstract:
  We update our work ``Two Higgs Doublet Model predictions for B->X_s gamma in
NLO QCD'', hep-ph/9802391 by taking into account the recently calculated
electromagnetic corrections. We present a new exclusion contour plot
(tan(\beta),m_H), where these corrections are included.


title:
Hunting for Contact Interactions at HERA with polarized lepton and
  proton beams

abstract:
  We explore the discovery and analysis potentials of the HERA collider, with
and without polarized beams, in search for electron-quark contact interactions
in the neutral current channel. We find that the sensitivity to contact
interactions when both beams are polarized is similar to the unpolarized case,
and is better than in the case where one has only lepton polarization. We
emphasize that the measurement of spin asymmetries in such a polarized context
could give some crucial informations on the chiral structure of these
postulated new interactions. The experimental conditions are carefully taken
into account.


title: Thermal Dileptons from a Nonperturbative Quark-Gluon Phase

abstract:
  Assuming that gluon condensates are important even above the deconfining
phase transition, we develop a model for the dilepton yield from a quark gluon
plasma. Using a simple fire ball description of a heavy ion collision, and
various estimates of the strengths of the gluon condensates, we compare our
predicted dilepton yields with those observed in the CERES and HELIOS
experiments at CERN. The simple model gives an adequate description of the
data, and in particular it explains the observed considerable enhancement of
the yield in the low mass region.


title:
Dissociation rates of J/psi's with comoving mesons - thermal vs.
  nonequilibrium scenario

abstract:
  We study J/psi dissociation processes in hadronic environments. The validity
of a thermal meson gas ansatz is tested by confronting it with an alternative,
nonequilibrium scenario. Heavy ion collisions are simulated in the framework of
the microscopic transport model UrQMD, taking into account the production of
charmonium states through hard parton-parton interactions and subsequent
rescattering with hadrons. The thermal gas and microscopic transport scenarios
are shown to be very dissimilar. Estimates of J/psi survival probabilities
based on thermal models of comover interactions in heavy ion collisions are
therefore not reliable.


title: J/\psi Suppression in Nucleus-Nucleus Collisions

abstract:
  We propose a model for the production and suppression of J/\psi mesons in
high-energy hadronic collisions. We factorized the process into a production of
the $c\bar{c}$ pairs of relative momentum $k=k_c-k_{\bar{c}}$ convoluted with a
transition probability from the produced $c\bar{c}$ pairs into the observed
J/$\psi$ mesons. As the produced $c\bar{c}$ pairs exit the nuclear matter, the
multiple scattering between the colored $c$ and $\bar{c}$ and the nuclear
medium increases the square of the relative momentum between the $c$ and
$\bar{c}, q^2=-k^2$, such that some of the $c\bar{c}$ pairs gain enough
invariant mass to transmute into open charm states. With only one parameter,
the amount of energy gained by the produced $c\bar{c}$ pair per unit length in
the nuclear medium, our model can fit all observed J/\psi suppression data
including recent NA50 data from Pb-Pb collisions.


title: Chiral Symmetry and the Nucleon Spin Structure Functions

abstract:
  We carry out a systematic investigation of twist-two spin dependent structure
functions of the nucleon within the framework of the chiral quark soliton model
(CQSM) by paying special attention to the role of chiral symmetry of QCD. The
importance of chiral symmetry is illustrated through the good reproduction of
the recent SLAC data for the neutron spin structure function $g_1^n (x,Q^2)$.
We also observe substantial difference between the predictions of the
longitudinally polarized distribution functions and those of the transversity
distribution functions. That the chiral symmetry may be responsible for this
difference is seen in the isospin dependence of the corresponding first
moments, i.e. the axial and tensor charges. The CQSM predicts $g_A^{(0)} /
g_A^{(3)} \simeq 0.25$ for the ratio of the isoscalar to isovector axial
charges, while $g_T^{(0)} / g_T^{(3)} \simeq 0.46$ for the ratio of the
isoscalar to isovector tensor charges, which should be compared with the
prediction $g_A^{(0)} / g_A^{(3)} = g_T^{(0)} / g_T^{(3)} = 3 / 5$ of the
constituent quark model or of the naive MIT bag model without proper account of
chiral symmetry. Another prominent prediction of the CQSM is the opposite
polarization of the $\bar{u}$ and $\bar{d}$ antiquarks, thereby indicating the
SU(2) asymmetric sea quark (spin) polarization in the nucleon.


title: Predictions for the forward cone in diffractive DIS

abstract:
  We calculate the diffraction slope $B_{D}$ for diffractive DIS. We find a
counterintuitive rise of $B_{D}$ from exclusive diffractive excitation of
vector mesons to excitation of continuum states with $M^{2} \sim Q^{2}$. For
the small-mass continuum we predict a rapid variation of $B_{D}$ with $M^{2}$
on the scale $m_{V}^{2}$ and a sharp drop of $B_{D}$ for a small-mass continuum
above the vector meson excitation.


title: The Simplest Massive Lagrangian Without Higgs Mechanism

abstract:
  The simplest massive Lagrangian, invariant for the global SU(2)
transformation, is constructed.


title:
Renormalization of the chiral pion-nucleon Lagrangian beyond
  next-to-leading order

abstract:
  The complete renormalization of the generating functional for Green functions
of quark currents between one-nucleon states in two flavor heavy baryon chiral
perturbation theory is performed to order $q^4$. We show how the heat kernel
method has to be extended for operators orthogonal to the heavy fermion
four-velocity. A method is developed to treat the multi-coincidence limit
arising from insertions of dimension two (and higher) operators on internal
baryon propagators in self-energy graphs. As examples, we study the divergences
in the isoscalar magnetic moment and the scalar form factor of the nucleon.


title:
Colour octet contribution to exclusive P-wave charmonium decay into
  nucleon-antinucleon

abstract:
  We show that although there is no infrared divergence in exclusive P-wave
quarkonium decays, the colour octet contribution is no less important than in
the inclusive decay. Results from more proper calculations with only colour
singlet contribution are not sufficient to account for the measured partial
decay widths and so the next higher Fock state must be included. Using the
$\c_J$ decay into $N\bar N$ as an example, a scheme is devised to yield
estimates of the decay widths using both contributions, the results are
comparable with experimental measurements.


title: Exploring Ensembles of Instantons

abstract:
  A number of observables are constructed which can give useful information on
instanton ensembles.The basic properties used are : (1) Instantons are SU(2)
configurations ,(2)They are self-dual or antiself-dual.


title:
Large Coulomb corrections to the $e^+e^-$ pair production at
  relativistic heavy ion colliders

abstract:
  We consider the Coulomb correction (CC) to the $e^+e^-$ pair production
related to multiphoton exchange of the produced $e^{\pm}$ with nuclei. The
contribution of CC to the energy distribution of $e^+$ and $e^-$ as well as to
the total pair production cross section are calculated with an accuracy of the
order of 1%. The found correction to the total Born cross section is negative
and equal to -25% at the RHIC for Au--Au and -14% at the LHC for Pb--Pb
collisions.


title: The running QCD coupling in the pre-asymptotic region

abstract:
  We study deviations from the perturbative asymptotic behaviour in the running
QCD coupling by analysing non-perturbative measurements of alpha_s (p) at low
momenta as obtained from the lattice three-gluon vertex. Our exploratory study
provides some evidence for power corrections to the perturbative running
proportional to 1/p^2.


title:
Matrix Element Corrections to Parton Shower Simulations of Heavy Quark
  Decay

abstract:
  Parton showers are accurate for soft and/or collinear emission, but for a
good description of the whole of phase space they need to be supplemented by
matrix element corrections. In this paper, we discuss matrix element
corrections to the decay t->Wb and apply our results to the HERWIG Monte Carlo
event generator. The phenomenological results show marked improvement relative
to previous versions and agree well with the exact first-order matrix-element
calculation.


title: Phase diagram of 3D SU(3) gauge-adjoint Higgs system

abstract:
  Thermally reduced QCD leads to three dimensional SU(3) gaugefields coupled to
an adjoint scalar field $A_0$. We compute the effective potential in the
one-loop approximation and evaluate the VEV's of $TrA_0^2$ and $TrA_0^3$. In
the Higgs phase not only the former, but also the latter has a VEV. This
happens where the SU(3) gauge symmetry is broken minimally with U(2) still
unbroken. It is plausible that in the Higgs phase one has a transition for
large enough Higgs selfcoupling to a region where $TrA_0^3$ has no VEV and
where the gaugesymmetry is broken maximally to $U(1)\times U(1)$.


title: Production of massive particles during reheating

abstract:
  What is commonly called the reheat temperature, $T_{RH}$, is not the maximum
temperature obtained after inflation. The maximum temperature is, in fact, much
larger than $T_{RH}$. As an application of this we consider the production of
massive stable dark-matter particles of mass $M_X$ during reheating, and show
that their abundance is suppressed as a power of $T_{RH}/M_X$ rather than
$\exp(-M_X/T_{RH})$. We find that particles of mass as large as $2\times 10^3$
times the reheat temperature may be produced in interesting abundance. In
addition to dark matter, our analysis is relevant for baryogenesis if the
baryon asymmetry is produced by the baryon (or lepton) number violating decays
of superheavy bosons, and also for relic ultra-high energy cosmic rays if
decays of superheavy particles are responsible for the highest energy cosmic
rays.


title: Diffraction : past, present and future

abstract:
  Hadronic diffraction has become a hot and fashionable subject in recent years
due to the great interest triggered by the HERA and Tevatron data. These data
have helped to put the field in a different perspective paving the road to a
hopefully more complete understanding than hitherto achieved. The forthcoming
data in the next few years from even higher energies (LHC) promise to sustain
this interest for a long time. It is, therefore, necessary to provide the
younger generations with as complete as possible discussion of the main
developments that have marked the growth of high energy diffractive physics in
the past and to assess the present state of the art. For this reason, this part
will be by far the largest. The analysis of the relationship between
conventional diffractive physics and the low-x physics from deep inelastic
scattering will allow us also to review the instruments which could help to
understand the developments we can expect from the future.


title: Pion--Pion Scattering Experiments at Low Energy

abstract:
  This work reviews the available experimental information on the pi-pi
scattering lengths, especially the recent near-threshold pi N -> pi pi N data
from several laboratories and the related application of the Chew-Low-Goebel
(CLG) technique well below 1 GeV/c momentum. At this time uncertainties
stemming from non-pion-exchange backgrounds in near-threshold CLG studies
appear to preclude a determination of the pi$-pi scattering lengths with the
desired accuracy of 10% or better.


title:
Strange hyperon and antihyperon production from quark and string-rope
  matter

abstract:
  Hyperon and antihyperon production is investigated using two microscopical
models: {\bf (1)} the fast hadronization of quark matter as given by the ALCOR
model; {\bf (2)} string formation and fragmentation as in the HIJING/B model.
We calculate the particle numbers and momentum distributions for Pb+Pb
collisions at CERN SPS energies in order to compare the two models with each
other and with the available experimental data. We show that these two
theoretical approaches give similar yields for the hyperons, but strongly
differ for antihyperons.


title:
Description of the weak interactions within the framework of
  electrodynamics

abstract:
  The weak interactions are described within the framework of electrodynamics.
The massive vector field is considered as photon with the effective mass
defined in the second order of the perturbation theory. Muon and tau-lepton are
considered to be composite particles having the structure
electron-positron-electron. The mass of muon is defined by the section of
two-photon annihilation. The mass of tau-lepton is defined by the section of
three-photon annihilation.


title: Atmospheric Neutrino Tests of Neutrino Oscillation Mechanisms

abstract:
  Recent Super-Kamiokande data on the atmospheric neutrino anomaly are used to
test various mechanisms for neutrino oscillations. It is found that the current
atmospheric neutrino data alone cannot rule out any particular mechanism.
Future long-baseline experiments should play an important role in identifying
the underlying neutrino oscillation mechanism.


title: The Family Group in Grand Unified Theories

abstract:
  We review the known ways of incorporating and breaking symmetries in a
renormalizable way. We summarize the various grand unified theories based on
$SU_5, SO_{10}$, and $E_6$ as family enlargement groups. An $SU_5$ model with
an $SU_2$ gauged family group is presented as an illustration. In it, the
e-family (i.e., e,u and d) is classically massless and acquires calculable mass
corrections. The family group is broken by the same agent that does the
superstrong breaking. Finally, we sketch a way of unifying the family group
with $SU_5$ into $SU_8$.


title: Nonperturbative interaction in qqbar bound states

abstract: We report about recent progress in the treatment of bound states in QCD.


title: Stochastic Disoriented Chiral Condensates

abstract:
  Applying a Langevin description of the linear sigma model we investigate four
different scenarios for the evolution of a disoriented chiral condensate:
annealing or quench with initial conditions governed by effective `light' or
physical mass pions. We present pion number distributions estimated from the
zero mode (i.e. k=0-field) component. The best DCC signal is expected for the
quench scenario with initial conditions centered around zero as would be the
case of effective light `pions' close to the phase transition. Our
investigations support the idea of looking for DCC formation in individual
events.


title: Inelasticity for hadron-carbon nucleus collisions from emulsion chamber

abstract:
  The inelasticity of hadron-carbon collisions for energies exceeding 100 TeV
is estimated from the carbon-emulsion chamber data at Pamirs to be $<K_C> =
0.65\pm 0.08$. When combined with data on hadron-lead collisions taken at the
same energy range it results in the $K\sim A^{0.086}$ mass number dependence of
inelasticity. The evaluated partial inelasticity for secondary ($\nu > 1$)
interactions, $K_{\nu >1} \simeq 0.2$, suggests that most of the energy is lost
in the first interaction.


title: Do we observe L\'evy flights in cosmic rays?

abstract:
  We argue that the so called long flying component (LFC) observed in some
cosmic ray experiments are yet another manifestation of L\'evy distributions
(with index $q=1.3$), this time of the distribution observation probability of
the depths of starting points of cascades. It means that LFC is governed by the
so called long-tail L\'evy-like anomalous superdiffusion, a phenomenon
frequently encountered in Nature. Its connection with the so called Tsallis's
statistics is also briefly discussed.


title: SU(N) SUSY GUTS with String Remnants: Minimal SU(5) and Beyond

abstract:
  A new superstring-motivated framework for a treatment of SU(N) SUSY GUTs is
argued. We show that all the present difficulties of the minimal supersymmetric
SU(5) model can successfully be overcome with a new renormalizable
reflection-invariant superpotential with two-adjoint scalars, one of which is
interpreted as a massive string mode essentially decoupled from the low-energy
particle spectra. This superpotential is proved to properly fix a mass ratio of
the basic adjoint scalar moduli, while its gauge-type reflection symmetry
essentially protects the model from gravitational smearing. The significant
heavy threshold effect related with the generic mass splitting of adjoint
moduli is shown to alter appropriately the running of gauge couplings towards
the realistic string-scale grand unification. Furthermore, the extension of the
superpotential to some SU(N) GUTs gives rise to, among many degenerate vacua,
the missing VEV vacuum configuration for the basic adjoint scalar, thus
providing a further clue to a doublet-triplet splitting problem, on the one
hand, and a family symmetry $SU(N-5)_F$ for quarks and leptons, on the other.
We predict the existence on a TeV scale two or three families of
pseudo-Goldstone bosons of type ($5+\bar{5}$) + SU(5)-singlets depending on
SU(7) or SU(8) GUT selected.


title: Four Various String Baryon Models and Regge Trajectories

abstract:
  Rotational motions for the quark-diquark (q-qq), linear (q-q-q)
"three-string" (Y) and "triangle" string baryon models are considered and
applied to description of baryonic orbitally exited states on the Regge
trajectories. For the model "triangle" (three pointlike masses bounded pairwise
by relativistic strings) the rotating closed string has a form of a curvilinear
triangle composed of segments of a hypocycloid. The ultrarelativistic
asymptotic relation between the energy $E=M$ and the total angular momentum $J$
has the same form $J\simeq\alpha'E^2+\alpha_1E^{1/2}$ for rotational states in
all string baryon models. Taking into account some type of quark spin-orbit
interaction one can describe the baryonic Regge trajectories by means of all
mentioned string baryon configurations under assumption of different effective
string tensions for them. Model depending estimations of effective quark masses
in this procedure $m_{ud}\simeq 130$ MeV, $m_{s}\simeq 270$ MeV are close for
all string configurations.


title: Four-Neutrino Mixing, Oscillations and Big-Bang Nucleosynthesis

abstract:
  We investigate the implications of the standard Big-Bang Nucleosynthesis
constraint on the number of light neutrinos in the framework of the two
four-neutrino schemes that are favored by the results of neutrino oscillation
experiments.


title: On fixed points and fermion mass structure from large extra dimensions

abstract:
  We examine the fixed point behaviour of Yukawa couplings in supersymmetric
theories with varying numbers of dimensions. We show that Pendleton-Ross fixed
point behaviour is greatly amplified in the MSSM with no extra dimensions and 4
extra $5+\bar{5}$ multiplets or the MSSM with one extra large dimension and 3
extra $5+\bar{5}$ multiplets. We also show that power law running in models
with large extra dimensions can give a hierarchical set of quasi-fixed points
for the Yukawa couplings in a manner which is similar to the Froggatt-Nielsen
mechanism. However, we also point out the limited perturbative domain in models
with power law running


title: Radiative corrections in inclusive rare B decays

abstract:
  We report recent theoretical progress in the analysis of radiative
corrections in inclusive rare B-decays. In view of the B-factories, currently
under construction at SLAC and KEK, and of the upgraded CESR experiment, the
experimental status of rare B decays is expected to improve significantly in
the near future. We review the complete NLL QCD calculations of the inclusive b
-> s gamma and the b -> d gamma decay rates. We also discuss recently computed
electroweak corrections and further improvements which lead to the current
theoretical prediction of B(B -> X_s gamma) = (3.32 +/- 0.30) * 10^{-4}. We
shortly comment on the theoretical uncertainty and on implications to physics
beyond the SM. We collect the experimental data already available from CESR and
LEP and discuss experimental and theoretical problems regarding the photon
energy spectrum.


title:
Nonequilibrium quantum dynamics of phase transitions in an expanding
  universe

abstract:
  I summarize the derivation of a set of Feynman rules appropriate for the
perturbative description of the nonequilibrium dynamics of the
symmetry-breaking phase transition in $\lambda\phi^4$ theory in a
Robertson-Walker universe. The approximation scheme I develop provides for a
treatment of dissipative effects which are essential to an adequate description
of the nonequilibrium state. It also provides for the emergence from an
initially symmetric state of a final state exhibiting the properties of
spontaneous symmetry breaking without the introduction by hand of any explicit
symmetry breaking.


title: Top Quark Seesaw Theory of Electroweak Symmetry Breaking

abstract:
  We study electroweak symmetry breaking involving the seesaw mechanism of
quark condensation. These models produce a composite Higgs boson involving the
left-handed top quark, yet the top mass arises naturally at the observed scale.
We describe a schematic model which illustrates the general dynamical ideas. We
also consider a generic low-energy effective theory which includes several
composite scalars, and we use the effective potential formalism to compute
their spectrum. We develop a more detailed model in which certain features of
the schematic model are replaced by additional dynamics.


title:
Fixed point structure of Pade-summation approximations to the QCD
  beta-function

abstract:
  Pad\'e-improvement of four-loop beta-functions in massive phi^4 scalar field
theory is shown to predict the known five-loop contribution with astonishing
(0.2%) accuracy, supporting the applicability of Pade-summations for
approximating all-orders MS-bar QCD beta-functions, as suggested by Ellis,
Karliner, and Samuel. Surprisingly, the most general set of [2|2] approximants
consistent with known two-, three-, and four-loop contributions to the QCD
beta-function with up to six flavours fail to exhibit any zeros that could be
interpreted as positive infrared fixed points, regardless of the unknown
five-loop term. When they occur, positive zeros of such [2|2] approximants are
preceded by singularities, leading to a double-valued beta-function that is
decoupled entirely from the infrared region, similar to the beta-function of
SUSY gluodynamics.


title: Dijet Mass Spectrum Limits on Flavor-Universal Colorons

abstract:
  Using recent D0 data on the dijet mass spectrum, we present a limit on
flavor-universal colorons. At 95% CL we find Mc/cot(theta) > 837 GeV. We
discuss the implications of this limit for models of quark compositeness,
non-standard gluon interactions, and dynamical electroweak symmetry breaking.
In addition, we place a lower bound Lambda_A8 > 2.1 TeV on the scale of
color-octet axial-vector contact interactions among quarks which could arise in
models of quark compositeness.


title: Chiral baryon in the coherent pair approximation

abstract:
  We revisit the work of K. Goeke, M. Harvey, F. Gr\"ummer, and J. N. Urbano
(Phys. Rev. {\bf D37}, 754 (1988)) who considered a chiral model for the
nucleon based on the linear sigma model with scalar-isoscalar scalar-isovector
mesons coupled to quarks and solved using the coherent-pair approximation. In
this way the quantum pion field can be treated in a non-perturbative fashion.
In this work we review this model and the coherent pair approximation
correcting several errors in the earlier work. We minimize the expectation
value of the chiral hamiltonian in the ansatz coherent-pair ground state
configuration and solve the resulting equations for nucleon quantum numbers. We
calculate the canonical set of nucleon observables and compare with the
Hedgehog model and experiment. Using the corrected equations yield slightly
different values for nucleon observables but do not correct the large virial
deviation in the $\pi$-nucleon coupling. Our results therefore do not
significantly alter the conclusions of Goeke, et al..


title: The elastic QCD dipole amplitude at one-loop

abstract:
  We derive the analytic expression of the two one-loop dipole contributions to
the elastic 4-gluon amplitude in QCD. The first one corresponds to the double
QCD pomeron exchange, the other to an order alpha^2 correction to one-pomeron
exchange. Both are expressed in terms of the square of the recently derived
triple QCD pomeron vertex and involve a summation over all conformal
Eigenvectors of the BFKL kernel.


title: Stabilized NMSSM without Domain Walls

abstract:
  We reconsider the Next to Minimal Supersymmetric Standard Model (NMSSM) as a
natural solution to the $\mu$-problem and show that both the stability and the
cosmological domain wall problems are eliminated if we impose a ${\cal {Z}}_2$
$R$-symmetry on the non-renormalizable operators.


title:
Taylor's Series and Dispersion Relation Analyses of the Vector Pion Form
  Factor and their Comparison with Perturbative and Non Perturbative
  Calculations

abstract:
  The first three coefficients of the Taylor's series expansion of the vector
pion form factor as a function of the momentum transfer are evaluated using
experimental data on the pion form factor and the P-wave pi pi phase shifts.
The real part of the form factor as a function of energy is also calculated by
dispersion relation. Comparisons these results with Chiral Perturbation Theory
and unitarized models are given.


title: Hard thermal loops effective action for piO -> gamma gamma

abstract:
  I consider the low temperature correction to the anomalous coupling of a
neutral pion to two photons from an effective Lagrangian point of view.


title: Abelian Landau-Pomeranchuk-Migdal effects

abstract:
  It is shown that the high-energy expansion of the scattering amplitude
calculated from Feynman diagrams factorizes in such a way that it can be
reduced to the eikonalized form up to the terms of inverse power in energy in
accordance with results obtained by solving the Klein-Gordon equation.
Therefore the two approaches when applied to the suppression of the emission of
soft photons by fast charged particles in dense matter should give rise to the
same results. A particular limit of thin targets is briefly discussed.


title: Isospin Violation in Hadronic B-Decays

abstract:
  I present two disparate examples of isospin violation in hadronic B-decays.
In the first, the presence of \rho^0-\omega mixing in the decay
B^\mp\to\rho^\mp\rho^0(\omega)\to\rho^\mp\pi^+ \pi^- permits the extraction of
sgn(\sin \alpha), where \alpha is the usual angle of the unitarity triangle,
with minimal hadronic uncertainty. In the second, the presence of
\pi^0-\eta,\eta' mixing can obscure the extraction of \sin 2\alpha from an
isospin analysis in B\to\pi\pi decays.


title: Parton Distributions, d/u, and Higher Twist Effects at High X

abstract:
  A re-analysis of the NMC and SLAC data leads to a great improvement in our
knowledge of the valence d and u parton distribution functions at high x.
Standard parton distributions with our modifications are in good agreement with
QCD predictions for d/u at x=1, and with the CDHSW nu p and nubar p data, the
HERA charged current cross section data, the collider high-P_t jet data, and
the CDF W asymmetry data. With the inclusion of target mass and higher twist
corrections, the modified PDF's also describe all DIS data up to x = 0.98 and
down to Q^2 = 1 GeV^2.


title: Towards the Solution of the Solar Neutrino Problem

abstract:
  We discuss various aspects of the solar neutrino spectrum distortion and time
variations of fluxes. (i) Oscillations of neutrinos which cross the mantle and
the core of the Earth can be parametrically enhanced. The parametric effect
gives correct physical interpretation of the calculated day-night asymmetry.
(ii) Solution of the $\nu_{\odot}$-problem in schemes with three and more
neutrinos which accommodate explanations of other neutrino anomalies, in
particular, the atmospheric neutrino anomaly, can lead to complicated
distortion of the boron neutrino spectrum. (iii) The study of correlations
between time (seasonal or day-night) variations and spectrum distortion will
help to identify the solution of the $\nu_{\odot}$-problem.


title:
Comparison of Neutrino and Muon Structure Functions, Shadowing
  Corrections and Charge Symmetry Violation

abstract:
  Comparison of structure functions measured in neutrino and charged lepton
deep inelastic scattering can be used to test basic properties of parton
distribution functions such as the validity of charge symmetry. Recent
experiments indicate a substantial discrepancy between $F_2^\nu$ and $F_2^\mu$
in the region of small Bjorken-x. We discuss nuclear corrections and strange
and anti strange quark effects and show that none of them can account for the
observed discrepancy. These results suggest surprisingly large CSV effects in
nucleon sea distributions.


title: Hard exclusive electroproduction of two pions and their resonances

abstract:
  We study the hard exclusive production of two pions in the virtual photon
fragmentation region with various invariant masses including the resonance
region. The amplitude is expressed in terms of two-pion light cone distribution
amplitudes ($2\pi$DA's). We derive dispersion relations for these amplitudes,
which enables us to fix them completely in terms of $\pi\pi$ scattering phases
and a few low-energy subtraction constants determind by the effective chiral
lagrangian. Quantitative estimates of the resonance as well $\pi\pi$ background
DA's at low normalization point are made. We also prove certain new soft pion
theorem relating two-pion DA's to the one-pion DA. Crossing relations between
$2\pi$DA's and parton distributions in a pion are discussed.
  We demontrate that by studying the shape of the $\pi\pi$ mass spectra (not
absolute cross section!) in a diffractive electroproduction one can extract the
deviation of the meson ($\pi,\rho,$ etc.) wave functions from their asymptotic
form $6 z(1-z)$ and hence to get important information about the structure of
mesons. Also we discuss how the moments of quark distributions in a pion can be
measured in the hard diffraction. We suggest (alternative to S\"oding's)
parametrization of $\pi\pi$ spectra which is suitable for large photon
virtuality.


title: Grand unification with gauge mediated supersymmetry breaking

abstract:
  We consider constraints on gauge mediated supersymmetry breaking models
imposed by the requirement of grand unification. In particular, we demonstrate
several ways to reduce the number of parameters coming from the dynamical
supersymmetry breaking sector. One of approaches exploits nonperturbative
unification of gauge couplings in multi-messenger models.


title:
Exact mass dependent two--loop $\bar{\alpha}_s(Q^2)$ in the background
  MOM renormalization scheme

abstract:
  A two-loop calculation of the renormalization group $\beta$--function in a
momentum subtraction scheme with massive quarks is presented using the
background field formalism. The results have been obtained by using a set of
new generalized recurrence relations proposed recently by one of the authors
(O.V.T.). The behavior of the mass dependent effective coupling constant is
investigated in detail. Compact analytic results are presented.


title:
Aspects of Higgs physics and physics beyond the Standard Model at LHC
  and e+e- linear colliders

abstract:
  Recent developments in prospects of searching for Higgs particles and testing
their properties at the LHC and at TeV e+e- linear colliders are summarized.
The discovery limits of supersymmetric particles at the LHC are presented and
the accuracy is explored with which the fundamental SUSY parameters in the
context of supergravity models can be determined at high-luminosity linear
colliders. Finally, new discovery limits for gauge bosons in left-right
symmetric models at the LHC are presented.


title:
Flavor asymmetry of polarized and unpolarized sea quark distributions in
  the large-N_c limit

abstract:
  We summarize recent attempts to calculate the flavor asymmetry of the
nucleon's sea quark distributions in the large-$N_c$ limit, where the nucleon
can be described as a soliton of an effective chiral theory. We discuss the
leading-twist longitudinally polarized and transversity antiquark
distributions, $\Delta\bar u (x) - \Delta\bar d (x)$ and $\delta\bar u (x) -
\delta\bar d (x)$, as well as the unpolarized one, $\bar u (x) - \bar d (x)$,
which appears only in the next-to-leading order of the $1/N_c$-expansion.
Results for $\bar u (x) - \bar d (x)$ are in good agreement with the recent
Drell-Yan data from the FNAL E866 experiment. The longitudinally polarized
antiquark asymmetry, $\Delta\bar u (x) - \Delta\bar d (x)$, is found to be
larger than the unpolarized one.


title: Evaluation of \alpha (M^2_Z) and (g-2)_\mu

abstract:
  This talk summarizes the recent development in the evaluation of the leading
order hadronic contributions to the running of the QED fine structure constant
\alpha(s), at $s=M_{\rm Z}^2$, and to the anomalous magnetic moments of the
muon $(g-2)_\mu$. The accuracy of the theoretical prediction of these
observables is limited by the uncertainties on the hadronic contributions.
Significant improvement has been achieved in a series of new analyses which is
presented historically in three steps: (I), use of $\tau$ spectral functions in
addition to e^+e^- cross sections, (II), extended use of perturbative QCD and
(III), application of QCD sum rule techniques. The most precise values obtained
are: $\Delta\alpha_{had} (M_2^Z) =(276.3\pm1.6)\times10^{-4}$, yielding
$\alpha^{-1}(M_{\rm Z}^2)=128.933\pm0.021$, and $a_\mu^{\rm
had}=(692.4\pm6.2)\times 10^{-10}$ with which one finds for the complete
Standard Model prediction $a_\mu^{\rm SM}=(11 659 159.6\pm6.7)\times10^{-10}$.
For the electron $(g-2)_e$, the hadronic contribution is $a_e^{\rm
had}=(187.5\pm1.8)\times 10^{-14}$.


title: Classical inflaton field induced creation of superheavy dark matter

abstract:
  We calculate analytically and numerically the production of superheavy dark
matter (X) when it is coupled to the inflaton field \phi within the context of
a slow-roll m_\phi^2 \phi^2/2 inflationary model with coupling g^2 X^2
\phi^2/2. We find that X particles with a mass as large as 1000 H_i, where H_i
is the value of the Hubble expansion rate at the end of inflation, can be
produced in sufficient abundance to be cosmologically significant today. This
means that superheavy dark matter may have a mass of up to 10^{-3} Planck mass.
We also derive a simple formula that can be used to estimate particle
production as a result of a quantum field's interaction with a general class of
homogeneous classical fields. Finally, we note that the combined effect of the
inflaton field and the gravitational field on the X field causes the production
to be a nonmonotonic function of g^2.


title: Parametric Amplification of Gravitational Fluctuations During Reheating

abstract:
  We demonstrate that cosmological perturbations can undergo amplification by
parametric resonance during the preheating period following inflation, even on
scales larger than the Hubble radius, without violating causality. A unified
description of gravitational and matter fluctuations is crucial in order to
determine the strength of the instability. To extract specific signatures of
the oscillating inflaton field during reheating, it is essential to focus on a
variable describing metric fluctuations which is constant in the standard
analyses of inflation. When doing this in the case of a massive inflaton
without self coupling, we find no additional growth of super-horizon modes
during reheating beyond what the usual analyses of the growth of fluctuations
predict. However, for a massless self coupled inflaton, there is an initial
increase in the value of the gravitational potential, which may lead to
different predictions for observations.


title:
Comment on the possible electron neutrino excess in the Super-Kamiokande
  atmospheric neutrino experiment

abstract:
  We investigate the implications of a possible excess of the electron neutrino
events in the Super-Kamiokande atmospheric neutrino experiment. The excess, if
real, leads to constraints on the $\nu_\mu \leftrightarrow \nu_e$, $\nu_\mu
\leftrightarrow \nu_\tau$ and $\nu_e \leftrightarrow \nu_\tau$ oscillation
parameters. Specifically, the excess impies that $\nu_e - \nu_\mu$ and $\nu_\mu
- \nu_\tau$ mixings are large and $\nu_e - \nu_\tau$ mixing is small. We show
that the electron neutrino excess favors the large mixing angle MSW solution of
the solar neutrino problem.


title: The Mu and Tau Number of Supernovae

abstract:
  The neutrino-nucleon cross section is slightly larger than that for
$\bar\nu-N$. Therefore, $\bar\nu$ will escape more quickly from core collapse
supernovae leaving the star $\nu$ rich. A diffusion formalism is used to
calculate the time evolution of the mu and tau lepton number densities. These
quickly reach steady state equilibria. We estimate that a protoneutron star
with a maximum temperature near 50 MeV will contain over 50 % more $\nu_\mu$
and $\nu_\tau$ than $\bar\nu_\mu$ and $\bar\nu_\tau$. Supernovae may be the
only known systems with large mu and or tau lepton numbers.


title:
Upper bounds on all R-parity-violating \lambda\lambda'' combinations
  from proton stability

abstract:
  In an R-parity-violating supersymmetric theory, we derive upper bounds on all
the \lambda''_{ijk}\lambda_{i'j'k'}-type combinations from the consideration of
proton stability, where \lambda''_{ijk} are baryon-number-violating couplings
involving three baryonic fields and \lambda_{i'j'k'} are
lepton-number-violating couplings involving three leptonic fields.


title: Proton-nucleus cross section at high energies

abstract:
  Cross sections for proton inelastic collision with different nuclei are
described within the Glauber and multiple scattering approximations. A
significant difference between approximate `Glauber' formula and exact
calculations with a geometrical scaling assumption for very high-energy cross
section is shown. Experimental values of proton-proton cross sections obtained
using extensive air shower data are based on the relationship of proton-proton
and respective proton-air absorption cross sections. According to obtained
results values reported by the Akeno and Fly's Eye experimental groups are
about 10% overestimated. The proper energy dependence of absorption cross
section for collisions with air nuclei is of a great importance for studies of
high energy cosmic rays using the Monte Carlo technique.


title: Exact Results in Renormalization of Softly Broken SUSY Gauge Theories

abstract:
  It is shown that softly broken theory is equivalent to a rigid theory in
external spurion superfield. The singular part of effective action in a broken
theory follows from a rigid one by a simple redefinition of the couplings. This
gives an explicit relation between the soft and rigid couplings
renormalizations. As an illustration the renormalization group functions in the
MSSM have been calculated. The method opens a possibility to construct a
totally all loop finite N=1 SUSY gauge theory, including the soft SUSY breaking
terms. Explicit relations between the soft terms, which lead to a completely
finite theory in any loop order, are given.


title:
Measuring CP Violation and Testing Factorization in B_d \to D^*\pmD^\mp
  and B_s \to D^*\pm_sD^\mp_s Decays

abstract:
  We show that the CP-violating phases \beta and \beta' can respectively be
determined from the time-dependent measurements of B_d \to D^*\pmD^\mp and B_s
\to D^*\pm_sD^\mp_s decays, whose final states are non-CP eigenstates. The
penguin contributions to the mixing-induced interference quantities are
expected to be about 4% or smaller. We also point out two observables of O(1),
which are pure functions of decay constants and form-factors, for a clean test
of the factorization hypothesis in neutral-B decays into two heavy charmed
mesons.


title:
Drell-Yan Cross Section and J/psi Production in High-Energy
  Nucleus-Nucleus Collisions

abstract:
  We use the Drell-Yan differential distribution dN_{DY}^{AB}/dE_T in
high-energy nucleus-nucleus collisions to obtain a relation between the
transverse energy E_T and the impact parameter b. Such a relation is then
utilized to study the transverse-energy dependence of J/psi production in Pb-Pb
collisions, using the J/psi absorption model presented previously. The
anomalous Pb-Pb suppression data at 158A GeV can be explained if one assumes
the occurrence of a new phase of strong J/psi absorption when the energy
density exceeds 4.2 GeV/fm^3. The results are extended to make predictions for
J/psi production at higher collision energies. It is found that J/psi survival
probabilities reach the lowest survival limit when the nucleon-nucleon
center-of-mass energies is greater than about 35 GeV.


title:
Charge and Colour Breaking Constraints in the MSSM With Non-Universal
  SUSY Breaking

abstract:
  We examine charge/colour breaking along directions in supersymmetric field
space which are F and D-flat. We catalogue the dangerous directions and include
some new ones which have not previously been considered. Analytic expressions
for the resulting constraints are provided which are valid for all patterns of
supersymmetry breaking. As an example we consider a recently proposed pattern
of supersymmetry breaking derived in Horava-Witten M-theory, and show that
there is no choice of parameters for which the physical vacuum is a global
minimum.


title: What the Atmospheric Neutrino Anomaly is Not

abstract:
  The atmospheric neutrino anomaly is the apparent reduction of the
$\nu_{\mu}/\nu_{e}$ ratio observed in underground detectors. It represents
either a reduction in the muon neutrino interaction rate or an excess of the
electron neutrino interaction rate, or both.
  Unable to answer the question of ``What else could it be?'' this paper
explores a number of alternatives which do not seem to be viable. Various
methods to reduce the apparent muon rate or to increase the apparent electron
rate are discussed.
  Perhaps our bias that the interactions are due to neutrinos of atmospheric
origin is incorrect. Both of these assumptions need to be confirmed. Efforts to
reduce uncertainties in the estimated atmospheric neutrino flux would also help
to narrow the possibilities further.


title:
The QCD analysis of the CCFR data for $xF_3$: higher twists and
  $\alpha_s(M_Z)$ extractions at the NNLO and beyond

abstract:
  The improved next-to-next-to-leading order (NNLO) QCD analysis of the
experimental data of the CCFR collaboration for the $xF_3$ structure function
is made. Theoretical ambiguities of the NNLO fits are estimated by means of the
Pad\'e resummation technique, which was applied both in the expanded and
non-expanded forms. The NNLO and the new N$^3$LO $\alpha_s(Q^2)$
$\bar{MS}$-matching conditions are used. In the process of the fits we are
taking into account the target mas corrections and the twist-4 $1/Q^2$-terms.
Our NNLO results for $\alpha_s(M_Z)$ values, extracted from the CCFR $xF_3$
data, are $\alpha_s(M_Z)=0.118 \pm 0.002 (stat)\pm 0.005 (syst) \pm
0.003(theory)$ provided the twist-4 contributions are fixed through the
infrared renormalon model and $\alpha_s(M_Z)=0.116^{+ 0.006}_{-0.007}(stat)\pm
0.005 (syst) \pm 0.004(theory)$ provided the twist-4 terms are considered as
the free parameters. It is shown that the extracted at the NNLO order $x$-shape
of the twist-4 correction is almost unchanged after application of the Pad\'e
resummation approximant.


title: Three-Flavour Neutrino-Mixing Implications of the LSND Result

abstract:
  The LSND result is shown to fit into a minimal three-flavour neutrino-mixing
scenario capable of describing all known experimental facts provided the large
Delta M^2 = m_3^2 - m_2^2 \sim m_3^2 - m_1^2 lies in the range 2.5 x 10^{-1} <
Delta M^2 < 3.0 eV^2. In this range the value of P_{\mu\tau} is expected to be
about 5% or larger.


title:
Coherency vs. Stochasticity in Spike Production in Nuclear Collisions at
  Intermediate Energies

abstract:
  Multiparticle spike-production process is investigated in central C-Cu
collisions at 4.5 $A$ Gev/c per nucleon. The study is based on two different
hypotheses - stochastic vs. coherent - of the formation of spikes. To observe
manifestations of the stochastic dynamics, the non-regularities in the
multiplicity distributions are analyzed using intermittency approach to a
possible phase transition as well as the one-dimensional intermittency model.
The entropy indices are calculated based on the erraticity approach. Coherency
is studied in the framework of the coherent gluon-jet radiation model. To this
end, the spike-center pseudorapidity distributions are analyzed. Coexistence of
the two mechanisms of spike formation process is discussed.


title: Neutrino oscillations in space within a solvable model

abstract:
  We study neutrino oscillations in space within a realistic model in which
both the source and the target are considered to be stationary having
Gaussian-form localizations. The model admits an exact analytic solution in
field theory which may be expressed in terms of complementary error functions,
thereby allowing for a quantitative discussion of quantum-mechanical (coherent)
versus statistical (incoherent) uncertainties. The solvable model provides an
insightful framework in addressing questions related to propagation and
oscillation of neutrinos that may not be attainable by the existing approaches.
We find a novel form of plane-wave behaviour of neutrino oscillations if the
localization spread of the source and target states due to quantum mechanics is
of macroscopic size but much smaller than neutrinos' oscillation length.
Finally, we discuss the limits on the coherence length of neutrino oscillations
and find that they mainly arise from uncertainties of statistical origin.


title: Supersymmetric dark matter with a cosmological constant

abstract:
  Recent measurements of cosmological parameters from the microwave background
radiation, type Ia supernovae, and the age of globular clusters help determine
the relic matter density in the universe. It is first shown with mild
cosmological assumptions that the relic matter density satisfies $\Omega_M h^2
< 0.6$ independent of the cosmological constant and independent of the SNIa
data. Including the SNIa data, the constraint becomes $\Omega_M h^2 < 0.35$.
This result is then applied to supersymmetric models motivated by generic
features in supergravity mediated supersymmetry breaking. The result is an
upper bound on gaugino masses within reach of the LHC and a 1.5 TeV lepton
collider. Thus, cosmological considerations are beginning to limit the
supersymmetric mass spectra in the experimentally verifiable range without
recourse to finetuning arguments, and without assuming a zero cosmological
constant.


title:
Improved QCD perturbative contributions and power corrections in
  radiative and semileptonic rare B decays

abstract:
  We calculate the leading power corrections to the decay rates, distributions
and hadronic spectral moments in rare inclusive \bxsll decays in the standard
model, using heavy quark expansion (HQE) in $(1/m_b)$ and a phenomenological
model implementing the Fermi motion effects of the b-quark bound in the
B-hadron. We include next-to-leading order perturbative QCD corrections and
work out the dependences of the spectra, decay rates and hadronic moments on
the model parameters in either HQE and the Fermi motion model. In the latter,
we take into account long-distance effects via $B \to X_s +(J/\psi,
\psi^\prime,...) \to X_s \ell^+ \ell^- $ with a vector meson dominance ansatz
and study the influence of kinematical cuts in the dilepton and hadronic
invariant masses on branching ratios, hadron spectra and hadronic moments. We
present leading logarithmic QCD corrections to the $b \to s \gamma\gamma$
amplitude. The QCD perturbative improved $B_{s}\to\gamma\gamma$ branching ratio
is given in the standard model including our estimate of long-distance effects
via $B_s \to \phi \gamma \to \gamma \gamma$ and $B_s \to \phi \psi \to \phi
\gamma \to \gamma \gamma$ decays. The uncertainties due to the renormalization
scale and the parameters of the HQE inspired bound state model are worked out.


title: SUSY Variants of the Electroweak Phase Transition

abstract:
  The MSSM with a light right-handed stop and supersymmetric models with a
singlet whose vev is comparable to that of the SU(2)_W Higgs allow for a
strongly first-order electroweak phase transition even for a mass of the
lightest Higgs around 100 GeV. After a short review of the standard model
situation we discuss these supersymmetric models. We also compare perturbative
calculations based on the dimensionally reduced 3-dimensional action with
lattice results and present an analytic procedure based on an analogue of the
stochastic vacuum model of QCD to estimate the nonperturbative contributions.


title: Higgs Decay into Gluons up to O(\alpha_s^3 G_F m_t^2)

abstract:
  The decay of the Standard Model Higgs boson in the intermediate-mass range
into gluons is considered where special emphasis is put on the influence of the
leading electroweak corrections proportional to G_F m_t^2. An effective
Lagrangian approach is used where the top quark is integrated out. The
evaluation of the coefficient function is performed using two different
methods. The first one is concerned with the direct evaluation of the vertex
diagrams and the second method is based on a low-energy theorem. In a first
step the tools needed for the computation are provided namely the
renormalization constants of the QCD Lagrangian are computed up to O(\alpha_s^2
G_F m_t^2). Also the decoupling constants for the strong coupling constant
\alpha_s and the light quark masses relating the quantities of the full theory
to the corresponding quantities of the effective one are evaluated up to order
\alpha_s^2 G_F m_t^2.


title: Another Look at Just-So Solar Neutrino Oscillations

abstract:
  We take another look at ``Just-So'' solar neutrino oscillations,
characterizing them by the energy $E_{\pi/2}$ at which the distance-varying
angle is $\pi/2$, instead of the usual $\Delta m^2$. The rising spectrum
recently observed by SuperKamiokande is consistent with $E_{\pi/2}\sim$ 6-9 MeV
and marginally with 48 MeV. The pp neutrinos must then be reduced to one-half
the standard solar model prediction, and $^7$Be neutrinos must make up a
significant part of the SAGE and GALLEX gallium signal. For $E_{\pi/2}$ close
to 9 and 48 MeV, the $^7$Be neutrinos will also show a large seasonal
variation, emphasizing the importance of direct measurements of the $^7$Be
neutrinos.


title: Beyond The Standard Model: This Time for Real

abstract:
  The value of the neutrino mass reported by the SuperK collaboration fits
beautifully into the framework of gauge theory unification. Here I justify this
claim, and review the other main reasons to believe in that framework.
Supersymmetry and SO(10) symmetry are important ingredients; nucleon
instability is a dramatic consequence.


title: The Bjorken Sum Rule in the Analytic Approach to Perturbative QCD

abstract:
  Results of applying analytic perturbation theory (APT) to the Bjorken sum
rule are presented. We study the third-order QCD correction within the analytic
approach and investigate its renormalization scheme dependence. We demonstrate
that, in the framework of the method, theoretical predictions of the Bjorken
sum rule are, practically, scheme independent for the entire interval of
momentum transfer.


title: Non-perturbative Effects in $B\to X_sl^+l^-$

abstract:
  The rare decay $B\to X_sl^+l^-$ provides excellent prospects for precision
tests of Standard Model flavour dynamics. The process can be computed in
perturbation theory with small uncertainty. However, in order to ensure a
reliable theoretical prediction, also potentially important effects from
non-perturbative QCD have to be controlled with sufficient accuracy. The
present article summarizes recent developments related to this topic.


title: Fractality of pomeron-exchange processes in diffractive DIS

abstract:
  By using Monte Carlo simulation of pomeron exchange model, the dependence of
the fractal behavior of the pomeron induced system in deep inelastic
lepton-nucleon scattering upon the diffractive kinematic variables is found
rather robust and not sensitive to the distinct parameterization of the pomeron
flux factor and structure function. Based on this characteristic fractal plot,
a feasible experimental test of the phenomenological pomeron-exchange model in
DESY $ep$ collider HERA is proposed.


title:
The Gross--Llewellyn Smith Sum Rule in the Analytic Approach to
  Perturbative QCD

abstract:
  We apply analytic perturbation theory to the Gross--Llewellyn Smith sum rule.
We study the $Q^2$ evolution and the renormalization scheme dependence of the
analytic three-loop QCD correction to this sum rule, and demonstrate that the
results are practically renormalization scheme independent and lead to rather
different $Q^2$ evolution than the standard perturbative correction possesses.


title: Renormalized Effective Hamiltonian Approach to QCD

abstract:
  Continuing our previous QCD Hamiltonian studies in the gluonic and quark
sectors, we describe a new renormalization procedure which generates an
effective Hamiltonian. The formulation, which is in the Coulomb gauge, provides
an improved framework for investigating hadron structure.


title: A monte carlo study of the rare decay $B \to X_s \ell^+ \ell^-$

abstract:
  We study, using a monte carlo approach, the rare decay $B\to X_s \ell^+
\ell^-$ including effects of the arbitrariness of the phase between the $\psi$
amplitudes and the perturbative amplitude, $b$-quark fermi motion inside the
$B$ meson, and experimental smearing of lepton momenta. The fermi motion of
$b$-quark inside the $B$ meson is modeled by the ACCMM model. We found that
such effects reduce the sensitivities of the spectra of invariant mass and
forward-backward asymmetry of the lepton pair to new physics; especially, in
the neighborhood of the $\psi$ resonances. We also estimate the sensitivity
range of Wilson coefficients with respect to the uncertainties.


title: Infrared and light-cone limit in hot QED

abstract:
  In hot gauge theories a breakdown of the hard thermal loop expansion occurs
for light-like external momenta or in the infrared region. In QED where a
resummation of ladder diagrams is usually advocated, it is shown that long
range magnetic interations involve a broader set of graphs. The consequence is
a generalized compensation of the hard modes damping terms at leading order in
the infrared limit and near the light-cone. The relevance of the so-called
improved hard thermal loop resummation scheme is discussed.


title: Higgs Mass, CP Violation and Phase Transition in the MSSM

abstract:
  The effective potential in the MSSM at the one-loop level is used to evaluate
masses of the neutral Higgs scalars and to study finite-temperature phase
transition. The CP violation in the Higgs sector, which is induced by the
spontaneous mechanism or by the complex parameters in the MSSM through
radiative corrections, is determined at zero and finite temperatures.


title: Phonon-Like Excitations of the Instanton Liquid

abstract:
  The phonon-like excitations of (anti)-instanton liquid ($\bar II$) due to
adiabatic variations of vacuum wave functions are studied in this paper. The
kinetic energy term is found and proper effective Lagrangian for such
excitations is evaluated.The properties of their spectrum, while the
corresponding masses are defined by $\Lambda_{QCD}$ with prevailing
chromoelectric component, are investigated based on the phenomenology of QCD
vacuum already developed.


title: Relativistic quark model and lowest hybrid mesons

abstract:
  The relativistic four-quark equations are found in the framework of the
dispersion relation technique. The solutions of these equations using the
method based on the extraction of leading singularities of the amplitudes are
obtained. The mass spectrum values of lowest hybrid mesons are calculated.


title: Resonance in Strong WW Rescattering in Massive SU(2) Gauge Theory

abstract:
  We investigate the effects of WW rescattering through strong anomalous
four-vector boson couplings. In the I=1, J=1 channel, we find a resonance with
a mass of approximately 200 GeV and a width of less than 12 GeV. In an
application to pion physics we find a small correction to the KSRF relation.


title: Lorentz-Violating Extension of the Standard Model

abstract:
  In the context of conventional quantum field theory, we present a general
Lorentz-violating extension of the minimal SU(3) x SU(2) x U(1) standard model
including CPT-even and CPT-odd terms. It can be viewed as the low-energy limit
of a physically relevant fundamental theory with Lorentz-covariant dynamics in
which spontaneous Lorentz violation occurs. The extension has gauge invariance,
energy-momentum conservation, and covariance under observer rotations and
boosts, while covariance under particle rotations and boosts is broken. The
quantized theory is hermitian and power-counting renormalizable, and other
desirable features such as microcausality, positivity of the energy, and the
usual anomaly cancellation are expected. Spontaneous symmetry breaking to the
electromagnetic U(1) is maintained, although the Higgs expectation is shifted
by a small amount relative to its usual value and the $Z^0$ field acquires a
small expectation. A general Lorentz-breaking extension of quantum
electrodynamics is extracted from the theory, and some experimental tests are
considered. In particular, we study modifications to photon behavior. One
possible effect is vacuum birefringence, which could be bounded from
cosmological observations by experiments using existing techniques. Radiative
corrections to the photon propagator are examined. They are compatible with
spontaneous Lorentz and CPT violation in the fermion sector at levels suggested
by Planck-scale physics and accessible to other terrestrial laboratory
experiments.


title: Limits on a Light Leptophobic Gauge Boson

abstract:
  We consider the phenomenology of a naturally leptophobic $Z$-prime boson in
the 1 to 10 GeV mass range. The $Z$-prime's couplings to leptons arise only via
a radiatively-generated kinetic mixing with the $Z$ and photon, and hence are
suppressed. We map out the allowed regions of the mass-coupling plane and show
that such a $Z$-prime that couples to quarks with electromagnetic strength is
not excluded by the current data. We then discuss possible signatures at bottom
and charm factories.


title:
Detecting and Studying the Lightest Pseudo-Goldstone Boson at Future
  $pp$, $e^+e^-$ and $\mu^+\mu^-$ Colliders

abstract:
  For an attractive class of dynamical symmetry breaking (technicolor) models,
the lightest neutral pseudo-Nambu-Goldstone boson ($\pzero$) contains only
down-type techniquarks and charged technileptons. We discuss the prospects for
discovering and studying the $\pzero$ of such models at the Tevatron and the
LHC and at future $\epem$ and $\mupmum$ colliders. Depending upon the number of
technicolors, $\ntc$, discovery of the $\pzero$ at the Tevatron and the LHC in
the $gg\to\pzero\to\gam\gam$ mode could be possible over a wide range of mass.
For $\ntc=4$, discovery of the $\pzero$ at an $\epem$ collider via the reaction
$\epem\to\gam \pzero$ should be possible as long as $\mpzero$ is not near
$\mz$. In the $\gam\gam$ collider mode of operation at an $\epem$ collider, the
$\gam\gam\to\pzero\to b\anti b$ signal should be very robust if $\ntc=4$. For
the minimal $\ntc=1$ case, detection of the $\pzero$ at the Tevatron and in
$\epem$ collisions will be very difficult, and the precision of measurements at
the LHC and the $\gam\gam$ collider decline markedly. A $\mupmum$ collider
yields a $\pzero$ production rate that does not depend markedly upon $\ntc$. At
a $\mupmum$ collider discovery of the $\pzero$ as an $s$-channel resonance
should prove possible via scanning, even if it has not already been detected
elsewhere. Once $\mpzero$ is precisely known, operation of the $\mupmum$
collider as a $\pzero$ factory will allow precision measurements of enough
observables to determine the number of technicolors of the theory and (up to a
discrete set of ambiguities) the fundamental parameters of the low-energy
effective Lagrangian describing the Yukawa couplings of the $\pzero$.


title: Can lepton flavor violating interactions explain the LSND results?

abstract:
  If the atmospheric and the solar neutrino problem are both explained by
neutrino oscillations, and if there are only three light neutrinos, then all
mass-squared differences between the neutrinos are known. In such a case,
existing terrestrial neutrino oscillation experiments cannot be significantly
affected by neutrino oscillations, but, in principle there could be an anomaly
in the neutrino flux due to new neutrino interactions. We discuss how a
non-standard muon decay $\mu^+ \to e^+ \bar\nu_e \nu_\ell$ would modify the
neutrino production processes of these experiments. Since $SU(2)_L$ violation
is small for New Physics above the weak scale one can use related
flavor-violating charged lepton processes to constrain these decays in a model
independent way. We show that the upper bounds on $\mu \to 3e$,
muonium-antimuonium conversion and $\tau \to \mu e e$ rule out any observable
effect for the present experiments due to $\mu^+ \to e^+ \bar\nu_e \nu_\ell$
for $\ell=e,\mu,\tau$, respectively. Applying similar arguments to
flavor-changing semi-leptonic reactions we exclude the possibility that the
"oscillation signals" observed at LSND are due to flavor-changing interactions
that conserve total lepton number.


title:
Resonant Slepton Production at Hadron Colliders in R-parity Violating
  Models

abstract:
  Single $s$-channel production of sleptons, such as $\tilde \tau$'s and/or
$\tilde \nu_\tau$, with their subsequent decay into purely leptonic or dijet
final states is possible in hadronic collisions via R-parity violating
couplings. We examine the impact of slepton production on bump searches in both
the Drell-Yan and dijet channels and examine whether the lepton charge
asymmetry in the $\ell\nu$ channel provides for additional search sensitivity.
As a consequence, search reaches in the slepton mass-R-parity violating
coupling plane are obtained for both the Tevatron and LHC. The possibility of
using the leptonic angular distributions and the lepton charge asymmetry to
distinguish slepton resonances from new gauge bosons is also analyzed.


title: Rare K Decays and New Physics Beyond the Standard Model

abstract:
  Rare decays provide a complementary window to direct collider searches as
probes of physics beyond the Standard Model. We present an overview of the New
Physics sensitivity provided by existing and future measurements of rare
leptonic and semileptonic $K$ decays within the context of several classes of
models.


title:
A Possible Hidden Symmetry and Geometrical Source of the Phase in the
  CKM Matrix

abstract:
  Based on the present data, the three CKM angles may construct a spherical
surface triangle whose area automatically provides a "holonomy" phase. By
assuming this geometrical phase to be that in the CKM matrix determined by an
unknown hidden symmetry, we compare the theoretical prediction on $\epsilon$
with data and find they are consistent within error range. We also suggest
restrictions for the Wolfenstein parameters explicitly, the agreement will be
tested by more precise measurements in the future. At least we can claim that
such geometrical phase should be part of the weak phase appearing in the CKM
matrix, even not the whole.


title: Updated Analysis of $a_2/a_1$ in Exclusive B Decays

abstract:
  Using recent experimental data and various theoretical calculations on form
factors, we reanalyze the effective parameters $a_1$ and $a_2$ and their ratio.


title: Damping rates in the MSSM and electroweak baryogenesis

abstract:
  We present an analysis of the thermalization rate of Higgsinos and winos
based on the imaginary part of the two-point Green function in the {\it
unbroken} phase of the MSSM. We use improved propagators including resummation
of hard thermal loops and the thermalization rate is computed at the one-loop
level in the high temperature approximation. We find that the damping is
typically dominated by scattering with gauge bosons, resulting in a damping
rate of about $\gamma_{\Ht}\simeq 0.025T$, $\gamma_{\Wt}\simeq 0.065T$. The
contribution from scattering with scalars is relatively small. Implications for
baryogenesis are also discussed.


title: Bose-Einstein Correlations and Color Reconnection in W-pair production

abstract:
  We propose a systematic study of Bose-Einstein correlations between identical
hadrons coming from different W decays. Experimentally accessible signatures of
these correlations as well as of possible color reconnection effects are
discussed on the basis of two-particle inclusive densities.


title: Atmospheric neutrino observations and flavor changing interactions

abstract:
  Flavor changing (FC) neutrino-matter interactions can account for the
zenith-angle dependent deficit of atmospheric neutrinos observed in the
SuperKamiokande experiment, without directly invoking neither neutrino mass,
nor mixing. We find that FC $\nu_\mu$-matter interactions provide a good fit to
the observed zenith angle distributions, comparable in quality to the neutrino
oscillation hypothesis. The required FC interactions arise naturally in many
attractive extensions of the Standard Model.


title: The Standard Model and Beyond

abstract:
  Content 1. Why we do Believe in the Standard Model
  2. Why we do not Believe in the Standard Model
  2.1Conceptual Problems
  2.2Hints from Experiment
  --2.2.1 Unification of Couplings
  --2.2.2 Dark Matter
  --2.2.3 Baryogenesis
  --2.2.4 Neutrino Masses
  --2.2.5 Ultra High Energy Cosmic Rays
  3. Conclusion


title: Non-perturbative energy levels of two-fermion bound states

abstract:
  For the S-states of positronium and muonium, the terms of an expansion of
energy levels in powers of the fine structure constant $\alpha$ are also
members of a "recoil series". The first two terms of that series are calculated
to all orders in $\alpha$.


title: Some Aspects of Trace Anomaly

abstract:
  We review briefly some well known facts about trace anomaly and then
concentrate on its 'infrared' manifestation. Among other things we show by
means of dispersion relations that dilatations and translations are conflicting
symmetries. We discuss the occurrence of some subtraction constants in
convergent dispersion relations and illustrate it on the decay process of Higgs
to two photons in the electroweak theory.


title: Classical theory for non-perturbative dynamics in hot QCD

abstract:
  I present an effective classical theory which describes the non-perturbative
real-time dynamics in hot gauge theories and has the potential for numerical
implementation.


title: Top Quark and Electroweak Symmetry Breaking Mechanism

abstract:
  After a brief comment on the role of top quark in models of electroweak
symmetry breaking (EWSB), I shall discuss what we know about top quark
interaction and how to improve that knowledge. Since bottom quark is the weak
isospin partner of the top quark, its interaction with a scalar boson may also
distinguish models of EWSB. We show that Tevatron can provide useful
information through the associated production of a scalar with a bottom quark
pair.


title: Flat directions, String Compactification and 3 Generation Models

abstract:
  We show how identification of absolutely flat directions allows the
construction of a new class of compactified string theories with reduced gauge
symmetry that may or may not be continuously connected to the original theory.
We use this technique to construct a class of 3 generation models with just the
Standard Model gauge group after compactification. We discuss the low-energy
symmetries necessary for a phenomenologically viable low-energy model and
construct an example in which these symmetries are identified with string
symmetries which remain unbroken down to the supersymmetry breaking scale.
Remarkably the same symmetry responsible for stabilising the nucleon is also
responsible for ensuring one and only one pair of Higgs doublets is kept light.
We show how the string symmetries also lead to textures in the quark and lepton
mass matrices which can explain the hierarchy of fermion masses and mixing
angles.


title:
Asymptotic Pade-Approximant Predictions for Renormalization-Group
  Functions of Massive $\phi^4$ Scalar Field Theory

abstract:
  Within the context of massive N-component $\phi^4$ scalar field theory, we
use asymptotic Pade-approximant methods to estimate from prior orders of
perturbation theory the five-loop contributions to the coupling-constant
beta-function $\beta_g$, the anomalous mass dimension $\gamma_m$, the
vacuum-energy beta-function $\beta_v$, and the anomalous dimension $\gamma_2$
of the scalar field propagator. These estimates are then compared with explicit
calculations of the five-loop contributions to $\beta_g$, $\gamma_m$,
$\beta_v$, and are seen to be respectively within 5%, 18%, and 27% of their
true values for $N$ between 1 and 5. We then extend asymptotic Pade-approximant
methods to predict the presently unknown six-loop contributions to $\beta_g$,
$\gamma_m$, and $\beta_v$. These predictions, as well as the six-loop
prediction for $\gamma_2$, provide a test of asymptotic Pade-approximant
methods against future calculations.


title: Diffractive vector mesons beyond the s-channel helicity conservation

abstract:
  We derive a full set, and determine the twist, of helicity amplitudes for
diffractive production of light to heavy vector mesons in deep inelastic
scattering. For large $Q^{2}$ all helicity amplitudes but the double-flip are
calculable in perturbative QCD and are proportional to the gluon structure
function of the proton at a similar hard scale. We find a substantial breaking
of the $s$-channel helicity conservation which must persist also in real
photoproduction.


title: Review on Double Beta Decay Experiments and Comparison with Theory

abstract:
  The current situation of the double beta decay direct counting experiments is
briefly reviewed. A comparison with the theoretical predictions in some
representative nuclear models is presented.


title: Evolution of the EMC Effect in Light Nuclei

abstract:
  The evolution of the EMC effect as a function of atomic mass $A$ is
considered for the first time for the lightest nuclei, D, $^3H$, $^3He$ and
$^4He$, with an approach based on the Bethe-Salpeter formalism. We show that
the pattern of the oscillation of the ratio $r^A(x) = F_2^A/F_2^N(D)$ varies
with $A$, unlike the pattern for nuclei with masses $A > 4$, where only the
amplitude of the oscillation changes.


title: Some Questions and Answers About CPT Violation

abstract:
  Minuscule violations of CPT and Lorentz invariance might arise in an
extension of the standard model as suppressed effects from a more fundamental
theory. In this contribution to the CarruthersFest, I present and answer some
questions about CPT and the possibility of its violation.


title: CPT and Lorentz Tests in Penning Traps

abstract:
  A theoretical analysis is performed of Penning-trap experiments testing CPT
and Lorentz symmetry through measurements of anomalous magnetic moments and
charge-to-mass ratios. Possible CPT and Lorentz violations arising from
spontaneous symmetry breaking at a fundamental level are treated in the context
of a general extension of the SU(3) x SU(2) x U(1) standard model and its
restriction to quantum electrodynamics. We describe signals that might appear
in principle, introduce suitable figures of merit, and estimate CPT and Lorentz
bounds attainable in present and future Penning-trap experiments. Experiments
measuring anomaly frequencies are found to provide the sharpest tests of CPT
symmetry. Bounds are attainable of approximately $10^{-20}$ in the
electron-positron case and of $10^{-23}$ for a suggested experiment with
protons and antiprotons. Searches for diurnal frequency variations in these
experiments could also limit certain types of Lorentz violation to the level of
$10^{-18}$ in the electron-positron system and others at the level of
$10^{-21}$ in the proton-antiproton system. In contrast, measurements comparing
cyclotron frequencies are sensitive within the present theoretical framework to
different kinds of Lorentz violation that preserve CPT. Constraints could be
obtained on one figure of merit in the electron-positron system at the level of
$10^{-16}$, on another in the proton-antiproton system at $10^{-24}$, and on a
third at $10^{-25}$ using comparisons of $H^-$ ions with antiprotons.


title:
On the value of $\alpha_s$ from the analysis of the SLAC/BCDMS deep
  inelastic scattering data

abstract:
  We performed NLO QCD analysis of the nonsinglet part of the combined
SLAC/BCDMS data on $F_2$ with the extraction of $\alpha_s$ and high twist
contribution. It was shown that the value of $\alpha_s$ obtained in the
analysis is sensitive to the statistical inference procedures dealing with
systematic errors on the data. The fit with the complete account of
point-to-point correlations of the data gave the value of
$\alpha_s(M_Z)=0.1180\pm0.0017 (68% C.L.)$, to be compared with the previously
reported value of $\alpha_s(M_Z)=0.113\pm0.003 (99% C.L.)$. This new value of
$\alpha_s$ is compatible with the LEP measurements and the world average. The
high twist contribution being strongly anti-correlated with the value of
$\alpha_s$ became lower than it was previously reported.


title: Lattice QCD and heavy quarks

abstract:
  Some interesting heavy-flavor questions are mentioned that may yield to the
methods of lattice QCD. Special emphasis is placed on topics which arise in the
discussion of CP violation in $B$ decays. Other subjects include quarkonium and
light-quark systems and some potential applications outside QCD.


title:
Cryptons: a stringy form of decaying superheavy dark matter, as a source
  of the ultra high energy cosmic rays

abstract:
  Cryptons, metastable bound states of matter in the string hidden sector, with
dynamically determined masses M_X on the order of 10^{12} GeV and lifetimes
tau_X greater than or on the order of 10^{18} yr, may be generated, through
inflation, with an abundance close to that required for a near-critical
universe. Their decay debris may be responsible for the most energetic
particles striking Earth's atmosphere. Recent developments of this astonishing
hypothesis are reviewed, indicating that NESTOR or the PIERRE AUGER project may
be able to confirm or refute the existence of cryptons.


title:
Matter Creation via Vacuum Fluctuations in the Early Universe and
  Observed Ultra-High Energy Cosmic Ray Events

abstract:
  Cosmic rays of the highest energy, above the Greisen-Zatsepin-Kuzmin cut-off
of the spectrum, may originate in decays of superheavy long-living X-particles.
These particles may be produced in the early Universe from vacuum fluctuations
during or after inflation and may constitute a considerable fraction of Cold
Dark Matter. We calculate numerically their abundance for a wide range of
models. X-particles are considered to be either bosons or fermions. Particles
that are several times heavier than inflaton, m_inflaton \approx 10^{13} GeV,
and were produced by this mechanism, can account for the critical mass in the
Universe naturally. In some cases induced isocurvature density fluctuations can
leave an imprint in anisotropy of cosmic microwave background radiation.


title: Universal Seesaw Mass Matrix Model and SO(10)\times SO(10) Unification

abstract:
  On the universal seesaw mass matrix model, which is a promising model of the
unified description of the quark and lepton mass matrices, the behaviors of the
gauge coupling constants and intermediate energy scales in the SO(10)_L\times
SO(10)_R model are investigated related to the neutrino mass generation
scenarios. The unification of the gauge coupling constants in the framework of
the non-SUSY model is possible if the SO(10) symmetry is broken via Pati-Salam
type symmetries.


title: The nuclear interaction at Oklo 2 billion years ago

abstract:
  We re-examine the effort to constrain the time-variability of the coupling
constants of the fundamental interactions by studying the anomalous isotopic
abundance of Sm observed at the remnants of the natural reactors which were in
operation at Oklo about 2 billion years ago, in terms of a possible deviation
of the resonance energy from the value observed today. We rely on new samples
that were carefully collected to minimize natural contamination and also on a
careful temperature estimate of the reactors. We obtain the upper bound
$(-0.2\pm 0.8)\times 10^{-17}$ ${\rm y}^{-1}$ on the fractional rate of change
of the electromagnetic as well as the strong interaction coupling constants.
Our result basically agrees with and even suggests some improvement of the
result due recently to Damour and Dyson. Strictly speaking, however, we find
another range of the resonance energy shift indicating a nonzero time variation
of the constants. We find a rather strong but still tentative indication that
this range can be ruled out by including the Gd data, for which it is essential
to take the effect of contamination into account.


title: Soft Gluon Resummation for Heavy Quark Electroproduction

abstract:
  We present the threshold resummation for the cross section for
electroproduction of heavy quarks. We work to next-to-leading logarithmic
accuracy, and in single-particle inclusive kinematics. We provide
next-to-leading and next-to-next-to-leading order expansions of our resummed
formula, and examine numerically the quality of these finite order
approximations. For the case of charm we study their impact on the structure
function $F_2$ and its differential distribution with respect to the charm
transverse momentum.


title: Uses of QCD sumrules (QCDSR) from different points of view

abstract:
  We support the idea that the baryon, B with mass $M_B$, couples to its
current with a coupling $\la_{B}^2 \sim 0.71 M_B^6$ from an analysis of
magnetic moment sum rules. And we find a sum rule among the experimental
magnetic moments which is independent of the parameters of QCDSR.


title: Higgs Boson Signals in Three b-jet Final States at the Fermilab Tevatron

abstract:
  At the Fermilab Tevatron, final states with three tagged b-jets could play an
important role in searches for a Higgs boson with mass in the range 100-300
GeV. These signals arise from gb fusion and we demonstrate their observability
in the limit of a large b-quark Yukawa coupling. Rather promising discovery
limits on such a coupling are obtained and consequent effects on the parameter
space of the Higgs-boson sector in the MSSM are discussed.


title:
Perturbative QCD analysis of $B(B\to Xl\bar{\nu})$, charm yield $<n_c>$
  in B decay, and $\tau (\Lambda_b)/\tau (B_d)$

abstract:
  We apply perturbative QCD factorization theorems to inclusive heavy hadron
decays, and obtain simultaneously a low semileptonic branching ratio $B(B\to
Xl\bar{\nu})=10.16%$, the average charm yield $<n_c>=1.17$ per $B$ decay, a
small lifetime ratio $\tau(\Lambda_b)/\tau(B_d)=0.78$, and the correct absolute
decay widths of the $B$ meson and of the $\Lambda_b$ baryon.


title:
Embedding Phenomenological Quark-Lepton Mass Matrices into SU(5) Gauge
  Models

abstract:
  We construct phenomenological quark-lepton mass matrices based on S$_3$
permutation symmetry in a manner fully compatible with SU(5) grand unification.
The Higgs particles we need are {\bf 5}, {\bf 45} and their conjugates. The
model gives a charge $-$1/3 quark vs charged lepton mass relation, and also a
good fit to mass-mixing relations for the quark sector, as well as an
attractive mixing pattern for the lepton sector, explaining a large mixing
angle between $\nu_\mu$ and $\nu_\tau$, and either large or small
$\nu_e-\nu_\mu$ mixing angle, depending on the choice of couplings, consistent
with the currently accepted solutions to the solar neutrino problem.


title: Radiative B_c -> tau nu_tau gamma decay

abstract:
  The radiative "B_c -> tau nu_tau gamma" decay is analyzed in the standard
model. The branching ratio of this decay is calculated and the contributions of
the Bremstrahlung and structure dependent parts are compared. It is shown that
this decay can be detected at LHC.


title: Constraints of Mixing Angles from Lepton Number Violating Processes

abstract:
  We discuss the constraints of lepton mixing angles from lepton number
violating processes such as neutrinoless double beta decay, (\mu^-)-(e^+)
conversion and K decay, $K^- \to \pi^+\mu^-\mu^-$ which are allowed only if
neutrinos are Majorana particles. The rates of these processes are proportional
to the averaged neutrino mass defined by $<m_{\nu} >_{a b}\equiv
|\sum_{j=1}^{3}U_{a j} U_{b j}m_j|$ in the absence of right-handed weak
coupling. Here $a, b (j)$ are flavour(mass) eigen states and $U_{a j}$ is the
left-handed lepton mixing matrix. We obtain the consistency conditions which
are satisfied irrelevant to the concrete values of CP violation phases (three
phases in Majorana neutrinos). These conditions constrain the lepton mixing
angles, neutrino masses $m_i$ and (< m_{\nu} >_{a b}). By using these
constraints we obtain the limits on the averaged neutrino masses for
(\mu^-)-(e^+) conversion and K decay, $K^- \to \pi^+\mu^-\mu^-$.


title: The BTeV Program at Fermilab

abstract:
  A description is given of BTeV, a proposed program at the Fermilab collider
sited at the C0 intersection region. The main goals are measurement of mixing,
CP violation and rare decays in both the $b$ and charm systems. The detector is
a two-arm-forward spectrometer capable of triggering on detached vertices and
dileptons, and possessing excellent particle identification, electron, photon
and muon detection.


title: Physics Involved in Neutrino Oscillation

abstract:
  Neutrino oscillation is discussed with emphases placed more on its conceptual
aspects. After reviewing the two conventional formulations, referred to here as
the same-energy prescription and the same-momentum prescription, wave packet
treatments are developed for each of these two prescriptions. Both wave packets
localized in space and those in time are considered, and, by invoking
relativistic kinematics as well, the necessary conditions for oscillation to
occur are derived, which appear to have a form more well-defined and
quantitative than what have been noted before. Some phenomenological
implications suggested by the wave packet treatments are briefly mentioned.
Finally, as a possible third prescription, the same-velocity prescription is
given.


title:
The Polarization of Radiation in Single Cristals in the Quasiclassical
  Approach

abstract:
  The radiation emission spectra of polarized photons emitted from charged
particles in single oriented crystals are obtained in Bayer-Katkov
quasiclassical approach. The results of numerical calculations are presented in
the region of small angles of incidence for which the coherent theory fails but
magnetic bremsstrahlung region isn't yet achieved. The spectral distribution of
linear polarization degree repeats, in general, the form of the intensity
distribution. At sufficiently small angles, in the case of planar orientation
of crystal, there is a wide maximum of essential linear polarization at low
frequencies.


title: Testing CPT with B Mesons

abstract:
  Apparent violations of CPT and Lorentz symmetry might arise in nature as a
result of spontaneous symmetry breaking in a theory beyond the standard model.
This talk summarizes a few relevant theoretical and experimental issues, with
some emphasis on implications for CPT tests with neutral-B mesons.


title:
Low-x behavior of spin structure functions: unitarity and
  nonperturbative hadron structure

abstract:
  We consider low-x behavior of the spin structure functions g_1(x) and h_1(x)
in the unitarized chiral quark model that combines the ideas on constituent
quark structure of hadrons with a geometrical scattering picture and unitarity.
A nondiffractive singular low-x dependence of g^p_1(x) and g_1^n(x) is obtained
and a diffractive type smooth behavior of h_1(x) is predicted at small x.


title: Running-mass models of inflation, and their observational constraints

abstract:
  If the inflaton sector is described by softly broken supersymmetry, and the
inflaton has unsuppressed couplings, the inflaton mass will run strongly with
scale. Four types of model are possible. The prediction for the spectral index
involves two parameters, while the COBE normalization involves a third, all of
them calculable functions of the relevant masses and couplings. A crude
estimate is made of the region of parameter space allowed by present
observation.


title:
Gravitational Phase Transition of Fermionic Matter in a
  General-Relativistic Framework

abstract:
  The Thomas-Fermi model at finite temperature is extended to describe a system
of self-gravitating weakly interacting massive fermions in a
general-relativistic framework. By cooling a nondegenerate gas of weakly
interacting massive fermions below some critical temperature, a condensed phase
emerges, consisting of quasidegenerate fermion stars. For fermion masses of 10
to 25 keV, these fermion stars may very well provide an alternative explanation
for the supermassive compact dark objects that are observed at galactic
centers.


title: W+W- Hadronic Decay Properties

abstract:
  Recent measurements of the properties of W+W- events produced in e+e-
collisions at Ecm=183 GeV at LEP are reviewed. The data are used to investigate
the predicted effects of final state interactions, specifically "colour
reconnection".


title: Expansion and Hadronization of a Chirally Symmetric Quark--Meson Plasma

abstract:
  Using a chirally symmetric Lagrangian, which contains quarks as elementary
degrees of freedom and mesons as bound states, we investigate the expansion and
hadronization of a fireball, which initially contains only quarks and produces
mesons by collisions. For this model, we study the time scales of expansion and
thermal and chemical equilibration. We find that the expansion progresses
relatively fast, leaving not necessarily enough time to establish thermal and
chemical equilibrium. Mesons are produced in the bulk of the fireball rather
than at a surface, at a temperature below the Mott temperature. Initial density
fluctuations become amplified during the expansion. These observations
challenge the applicability of hydrodynamical approaches to the expansion of a
quark-gluon plasma.


title: Searching for new physics in $b\to s s \bar d$ decays

abstract:
  For any new physics possibly emerging in the future B experiments, the
problem is how to extract the signals from the SM background. We consider the
decay $b\to s s\bar d$ which is very small in the SM. In the MSSM this decay is
possibly accessible in the future experiments. In the supersymmetric models
with R-parity violating couplings, this channel is not strictly constrained,
thus being useful in obtaining bounds on the lepton-number violating couplings.
A typical candidate for the suggested search is the $B^-\to K^-K^-\pi^+$ mode.


title: Direct Calculations of the Odderon Intercept in the Perturbative QCD

abstract:
  The odderon intercept is calculated directly, from its expression via an
average energy of the odderon Hamiltonian, using both trial wave functions in
the variational approach and the wave function recently constructed by
R.A.Janik and J.Wosiek.
  The results confirm their reported value for the energy. The odderon
intercept is calculated directly, from its expression via an average energy of
the odderon Hamiltonian, using both trial wave functions in the variational
approach and the wave function recently constructed by R.A.Janik and
J.Wosiek.The results confirm their reported value for the energy. Variational
calculations give energies some 30% higher. However they also predict the
odderon intercept to be quite close to unity. In fact, for realistic values of
$\alpha_s$, the intercept calculated variationally is at most 2% lower than the
exact one: 0.94 instead of 0.96. It is also found that the solution for $q_3=0$
does not belong to the odderon spectrum. The diffusion parameter is found to be
of the order 0.6.


title:
Positivity Constraints on Chiral Perturbation Theory Pion-Pion
  Scattering Amplitudes

abstract:
  We test the positivity property of the chiral perturbation theory (ChPT)
pion-pion scattering amplitudes within the Mandelstam triangle. In the one-loop
approximation, ${\cal O}(p^4)$, the positivity constrains only the coefficients
$b_3$ and $b_4$, namely one obtains that $b_4$ and the linear combination
$b_3+3 b_4$ are positive quantities. The two-loops approximation gives
inequalities involving all the six arbitrary parameters entering ChPT
amplitude, but the corrections to the one-loop approximation results are small.
ChPT amplitudes pass unexpectedly well all the positivity tests giving strong
support to the idea that ChPT is the good theory of the low energy pion-pion
scattering.


title:
The Hyperon-Nucleon Interaction Potential in the Bound State Soliton
  Model: The $\Lambda N$ Case

abstract:
  We develop the formalism to study the hyperon-nucleon interaction potential
within the bound state approach to the SU(3) Skyrme model. The general
framework is illustrated by applying it to the diagonal $\Lambda N$ potential.
The central, spin-spin and tensor components of this interaction are obtained
and compared with those derived using alternative schemes.