title: Searches for Higgs Bosons at LEP2

abstract:
  The latest results of Higgs boson searches from the four LEP experiments,
ALEPH, DELPHI, L3 and OPAL, are reviewed using the data taken in 1996 at
center-of-mass energies between 161 and 172 GeV. No signal was observed. The
95% CL combined lower mass limit for the Minimal Standard Model (MSM) Higgs
boson has increased from 66 GeV at LEP1 to 77.5 GeV with the first LEP2 data.
In the framework of the Two Higgs Doublet Model, the charged Higgs boson mass
limit has increased from 44 GeV to 54.5 GeV, independent of the decay branching
ratio. Large new (m_h,tan_beta) and (m_h,m_A) parameter regions are excluded in
the framework of the Minimal Supersymmetric extension of the Standard Model
(MSSM). Preliminary results from the 1997 data-taking at 183 GeV are presented,
and the prospects for a discovery in the near future are given.


title:
Impact of massive tau-neutrinos on primordial nucleosynthesis. Exact
  calculations

abstract:
  The influence of a massive Majorana tau-neutrino on primordial
nucleosynthesis is rigorously calculated. The system of three
integro-differential kinetic equations is solved numerically for the
tau-neutrino mass in the interval from 0 to 20 MeV. It is found that the usual
assumption of kinetic equilibrium is strongly violated and non-equilibrium
corrections considerably amplify the effect. Even a very weak restriction from
nucleosynthesis, allowing for one extra massless neutrino species, permits to
conclude that m_\nu_\tau < 1 MeV. For a stricter bound, e.g. for dN < 0.3, the
limit is m_\nu_\tau < 0.35 MeV.


title:
Testing the $Z\gamma H$ vertex at future linear colliders for
  intermediate Higgs masses

abstract:
  Higgs production in $e\gamma$ collisions, through the one-loop reaction
$e\gamma\to eH$ at large $p_T$, can provide a precise determination of the
$Z\gamma H$ vertex.


title:
Off-shell Corrections and Moments of the Deep Inelastic Nuclear
  Structure Functions

abstract:
  We present an improved method for handling off-shell effects in deep
inelastic nuclear scattering. With a firm understanding of the effects of the
nuclear wave function, including these off-shell corrections as well as binding
and nucleon-nucleon correlations, we can begin to examine the role of QCD in
nuclei through an analysis of the moments of the nuclear structure function.
Our analysis is aimed at extracting the Q^2 dependence of the moments of the
nucleon structure function by using the recent high x world Iron data and by
properly removing nuclear effects from the perturbative contribution. In
addition, we compare quantitatively the behavior of the extracted moments with
a simple O(1/Q^2) phenomenological form and we determine the mass term for this
parametrization.


title:
The Possibility of Large Direct CP Violation in B to K pi-Like Modes Due
  to Long Distance Rescattering Effects and Implications for the Angle gamma

abstract:
  We consider the strong rescattering effects that can occur in the decays such
as B -> K pi, K* pi, K rho... and their impact on direct CP violation in these
modes. First we discuss, in general, how the CPT theorem constrains the
resulting pattern of partial rate asymmetries leading to different brands of
direct CP. Traditional discussions have centered around the absorptive part of
the penguin graph which has Delta I=0 in b -> s transitions and as a result
causes ``simple'' CP violation; long-distance final state rescattering effects,
in general, will lead to a different pattern of CP: ``compound'' CP violation.
Predictions of simple CP are quite distinct from that of compound CP. Final
states rescattering phases in B decays are unlikely to be small possibly
causing large compound CP violating partial rate asymmetries in these modes.
CPT theorem requires a cancellation of PRA due to compound CP amongst the
$K\pi$ states themselves; thus there can be no net cancellation with other
states such as K*\pi, K\rho etc. Therefore, each class of such modes, namely K
pi, K rho, K^*pi, K a_1 etc. can have large direct CP emanating from
rescattering effects. Various repercussions for the angle $\gamma$ are also
discussed.


title: Double-Flavor Oscillations and Properties of Heavy Mesons

abstract:
  Phenomenon of coherent double-flavor oscillations is discussed. They can
arise when heavy flavored neutral mesons decay with production of neutral
kaons. The oscillations may be used to study detailed properties of the heavy
mesons and their decays. They may give new insight into the problem of
CP-violation. In particular, they provide the only known way to the complete
unambiguous measurements of CP-violating parameters for neutral B-meson decays.
The corresponding experiments seem to be hard, but possible at hadron
facilities.


title: Photon decay gamma->nu anti-nu in an external magnetic field

abstract:
  The process of the photon decay into the neutrino - antineutrino pair in a
magnetic field is investigated. The amplitude and the probability are analysed
in the limits of relatively small and strong fields. The probability is
suppressed by a factor (G_F m^2_e)^2 as compared with the probability of the
pure electromagnetic process gamma -> e- e+. However, the process with
neutrinos could play a role of an additional channel of stellar energy-loss.


title:
Neutrino Beams from Muon Storage Rings: Characteristics and Physics
  Potential

abstract:
  High-intensity high-energy neutrino beams could be produced by exploiting a
very intense future muon source, and allowing the muons to decay in a storage
ring containing a long straight section. Taking the parameters of muon source
designs that are currently under study, the characteristics of the neutrino
beams that could be produced are discussed and some examples of their physics
potential given. It is shown that the neutrino and antineutrino beam
intensities may be sufficient to produce hundreds of charged current
interactions per year in a detector on the far side of the Earth.


title: Dark Matter Neutrinos Must Come with Degenerate Masses

abstract:
  It has been known that there are two schemes in the framework of three flavor
neutrinos to accommodate the global features of the hot dark matter neutrinos,
the solar neutrino deficit and the atmospheric neutrino anomaly in a manner
consistent with terrestrial neutrino experiments, i.e., hierarchical mass
neutrinos and almost degenerate neutrinos. We demonstrate that the recent
result by the CHOOZ experiment excludes the scheme of hierarchical neutrinos.
We also point out in the scheme of almost degenerate neutrinos that if
neutrinos are Majorana particles then the double $\beta$ decay experiments must
see positive signals on their way to reach a limit more stringent than the
present one by a factor of 5.


title: Neutrino Masses in Astrophysics and Cosmology

abstract:
  Cosmology yields the most restrictive limits on neutrino masses and
conversely, massive neutrinos would contribute to the cosmic dark-matter
density and would play an important role for the formation of structure in the
universe. Neutrino oscillations may well solve the solar neutrino problem and
can have a significant impact on supernova physics. The neutrino signal from a
future galactic supernova could provide evidence for cosmologically interesting
neutrino masses or set interesting limits.


title:
Estimates of dilepton spectra from open charm and bottom decays in
  relativistic heavy-ion collisions

abstract:
  The spectra of lepton pairs from correlated open charm and bottom decays in
ultrarelativistic heavy-ion collisions are calculated. Our approach includes
energy loss effects of heavy quarks in deconfined matter which are determined
by temperature and density of the expanding parton medium. We find a noticeable
suppression of the initial transverse momentum spectrum of heavy quarks due to
the energy loss at LHC conditions. Within the central rapidity covered by the
ALICE detector system, the dominant contribution from bottom decays to the high
invariant mass dielectron spectrum is predicted.


title:
The phenomena of the time-violating photon polarization plane and
  neutron spin rotation by a diffraction grating. New methods of measuring of
  the time-violating interactions

abstract:
  It is shown, that the new phenomena of the T-violating photon polarization
plane and neutron spin rotation appear under diffraction in a
noncentrosymmetrical diffraction grating. The equations describing the
T-violating photon scattering by a diffraction grating and neutron interaction
with noncentrosymmetrical crystal have been obtained. These phenomena may be
used for time-violating interactions investigation.


title: QCD connection between hadron and jet multiplicities

abstract:
  The perturbative QCD provides a good overall description of both the jet and
hadron multiplicities in the $e^+e^-$ annihilation reaction. In this
description the hadrons are considered as dual to partons at a small resolution
parameter $Q_0$ characteristic of a hadronic scale of few hundred MeV.


title: Non-spectator contributions to B->X_s eta'

abstract:
  We propose a nonspectator mechanism in which eta' is produced by two gluon
fusion as the underlying process to explain the inclusive B-> X_s eta' as well
as the exclusive B -> K^(*) eta' decays.


title:
J/\Psi N and Psi' N total cross sections from photoproduction data:
  failure of vector dominance

abstract:
  Values for the cross sections $\sigma^{\Psi N}_{tot}$ and $\sigma^{\Psi'
N}_{tot}$ are of crucial importance, once one wants to understand nuclear
suppression of $J/\Psi$($\Psi'$) in a search for the quark gluon plasma. Quoted
values are usually extracted from $\gamma N \to J/\Psi(\Psi') N$ data via the
vector dominance model (VDM) and are very small compared with expectations from
QCD. The validity of QCD is questioned. When the VDM is extended to a
multi-channel case, the $\gamma N$ data lead to a value $2.8\pm 0.12 mb
<\sigma_{tot}^{\Psi N}(\sqrt{s}= 10 GeV) < 4.1\pm 0.15 mb$, which is a factor 3
larger than the VDM prediction. Errors are due to experimental input, and the
corridor shows the theoretical uncertainty. We also derive from the data
$\sigma_{tot}^{\Psi' N}/\sigma_{tot}^{J/\Psi N}\approx 4$, where we could not
estimate the theoretical uncertainty.


title: Quarkonium polarization as a test of non-relativistic effective theory

abstract:
  I compare current approaches to quarkonium production with regard to what
they tell us about quarkonium polarization. Predictions for $J/\psi$
polarization in hadron-hadron and photon-hadron collisions are summarized.


title: Jet photoproduction and the structure of the photon

abstract:
  Various jet observables in photoproduction are studied and compared to data
from HERA. The feasibility of using a dijet sample for constraining the parton
distributions in the photon is then studied. For the current data the
experimental and theoretical uncertainties are comparable to the variation due
to changing the photon parton distribution set.


title: Neutralino Cascades in the (M+1)SSM

abstract:
  In the (M+1)SSM an additional gauge singlet Weyl spinor appears in the
neutralino sector. For a large part of the parameter space this approximative
eigenstate is the true LSP. Then most sparticle decays proceed via an
additional cascade involving the NLSP -> LSP transition, where the NLSP is the
non-singlet next-to-lightest neutralino. We present a comprehensive list of all
processes, which contribute to the NLSP -> LSP transition, the partial widths
and the total NLSP decay rate. We perform a scan of the parameters of the model
compatible with universal soft terms, and find that the NLSP life time can be
quite large, leading to macroscopically displaced vertices. Our results imply
that the signatures for sparticle production in the (M+1)SSM can be very
different from the MSSM, and are important for calculations of the abundance of
dark matter in this model.


title: Structure Functions of the Nucleon and their Interpretation

abstract:
  The current status of measurements of the nucleon structure functions and
their understanding is reviewed. The fixed target experiments E665, CCFR and
NMC and the HERA experiments H1 and ZEUS are discussed in some detail. The
extraction of parton momentum distribution functions from global fits is
described, with particular attention paid to much improved information on the
gluon momentum distribution. The status of alpha_s measurements from deep
inelastic data is reviewed. Models and non-perturbative approaches for the
parton input distributions are outlined. The impact on the phenomenology of QCD
of the data at very low values of the Bjorken x variable is discussed in
detail. Recent advances in the understanding of the transition from deep
inelastic scattering to photoproduction are summarised. Some brief comments are
made on the recent HERA measurements of the ep NC and CC cross-sections at very
high Q2.


title: Two-loop Correction to the Leptonic Decay of Quarkonium

abstract:
  Applying asymptotic expansions at threshold, we compute the two-loop QCD
correction to the short-distance coefficient that governs the leptonic decay
$\psi\to l^+ l^-$ of a S-wave quarkonium state and discuss its impact on the
relation between the quarkonium non-relativistic wave function at the origin
and the quarkonium decay constant in full QCD.


title: Minimal Supersymmetric Standard Model within CompHEP software package

abstract:
  The Minimal Supersymmetric Standard Model is presented as a model for the
CompHEP software package as a set of files containing the complete Lagrangian
of the MSSM, particle contents and parameters. All resources of CompHEP with a
user-friendly interface are now available for the phenomenological study of the
MSSM. Various special features of the model are discussed.


title: Exact Solutions for Matter-Enhanced Neutrino Oscillations

abstract:
  The analogy between supersymmetric quantum mechanics and matter-enhanced
neutrino oscillations is exploited to obtain exact solutions for a class of
electron density profiles. This integrability condition is analogous to the
shape-invariance in supersymmetric quantum mechanics. This method seems to be
the most direct way to obtain the exact survival probabilities for a number of
density profiles of interest, such as linear and exponential density profiles.
The resulting neutrino amplitudes can also be utilized as comparison amplitudes
for the uniform semiclassical treatment of neutrino propagation in arbitrary
electron density profiles.


title:
$b\to s\gamma$ Constraints on the Minimal Supergravity Model with Large
  $\tan\beta$

abstract:
  In the minimal supergravity model (mSUGRA), as the parameter $\tan\beta$
increases, the charged Higgs boson and light bottom squark masses decrease,
which can potentially increase contributions from $tH^\pm$, $\tg\tb_j$ and
$\tz_i\tb_j$ loops in the decay $b\to s\gamma$. We update a previous QCD
improved $b\to s\gamma$ decay calculation to include in addition the effects of
gluino and neutralino loops. We find that in the mSUGRA model, loops involving
charginos also increase, and dominate over $tW$, $tH^\pm$, $\tg\tq$ and
$\tz_i\tq$ contributions for $\tan\beta\agt 5-10$. We find for large values of
$\tan\beta \sim 35$ that most of the parameter space of the mSUGRA model for
$\mu <0$ is ruled out due to too large a value of branching ratio $B(b\to
s\gamma)$. For $\mu >0$ and large $\tan\beta$, most of parameter space is
allowed, although the regions with the least fine-tuning (low $m_0$ and
$m_{1/2}$) are ruled out due to too low a value of $B(b\to s\gamma)$. We
compare the constraints from $b\to s\gamma$ to constraints from the neutralino
relic density, and to expectations for sparticle discovery at LEP2 and the
Fermilab Tevatron $p\bar p$ colliders. Finally, we show that non-universal GUT
scale soft breaking squark mass terms can enhance gluino loop contributions to
$b\to s\gamma$ decay rate even if these are diagonal.


title: Bounding the effect of penguin diagrams in $a_{CP}(B^0 \to \pi^+\pi^-)$

abstract:
  A clean determination of the angle $\alpha$ of the unitary triangle from
$B\to \pi\pi$ decays requires an isospin analysis. If the $B \to \pi^0\pi^0$
and $\bar B \to \pi^0\pi^0$ decay rates are small it may be hard to carry out
this analysis. Here we show that an upper bound on the error on $\sin 2\alpha$
due to penguin diagram effects can be obtained using only the measured rate
$\BR(B^\pm \to \pi^\pm \pi^0)$ and an upper bound on the combined rate $\BR(B
\to \pi^0 \pi^0) + \BR(\bar B \to \pi^0 \pi^0)$. Since no b flavor tagging is
needed to measure this combined rate, the bound that can be achieved may be
significantly better than any approach which requires separate flavor-tagged
neutral pion information.


title: Suggested new modes in supersymmetric proton decay

abstract:
  We show that in supersymmetric unified theories such as SO(10),
implementation of the see-saw mechanism for neutrino masses introduces a new
set of color triplet fields and thereby a new source of d=5 proton decay
operators. For neutrino masses in a plausible range, these operators are found
to have the right strength to yield observable, but not yet excluded, proton
decay rates. The flavor structure of the new operators is distinctive. Proton
decay modes into a charged lepton, such as l^+ \pi^0, l^+ K^0 and l^+ \eta
where l = e or \mu, can become prominent, even for low or moderate values of
tan(\beta) < 10, along with the \nu K^+ and \nu \pi^+ modes. A distinctive
feature is the charged lepton modes involving an e^+ and/or a \mu^+ with the
ratio \Gamma(l^+ K^0):\Gamma(l^+ \pi^0) = 2:1.


title:
$O(N_f\alpha^2)$ Radiative Corrections in Low-Energy Electroweak
  Processes

abstract:
  Of the the three best-measured electroweak observables, $\alpha$, $G_\mu$ and
$M_Z$, the first two are extracted from low-energy processes. Both $G_\mu$ and
$M_Z$ are now known to an accuracy of about 2 parts in $10^5$ and there is a
proposal to improve the measurement of the muon lifetime by a factor of 10 in
an experiment at Brookhaven. Yet calculations of electroweak radiative
corrections currently do no better than a few parts in $10^3$--$10^4$ and
therefore cannot exploit to available experimental precision. We report on the
calculation of the ${\cal O}(N_f\alpha^2)$ corrections to Thomson scattering
and the muon lifetime from which $\alpha$ and $G_\mu$, respectively, are
obtained. The ${\cal O}(N_f\alpha^2)$ corrections are expected to be a dominant
gauge-invariant subset of 2-loop corrections.


title:
Production of Hard Photons and Jets in Deep Inelastic Lepton Proton
  Scattering at Order O(\alpha_s)

abstract:
  We calculate the O(\alpha_s) corrections to the production of a hard and
isolated photon accompanied by one or two jets in deep inelastic lepton nucleon
scattering at HERA. Numerical results are presented and the potential of this
process for studies of parton distribution functions is discussed.


title: QED Corrections for Polarized Elastic MU-E Scattering

abstract:
  We present a new study of polarized elastic muon-electron scattering. The
Born cross-section is calculated for arbitrary polarization of muon and
electron. The complete photonic O(alpha) radiative corrections are determined
for the case of longitudinally polarized muons and electrons. All calculations
are done by two methods: semianalytic, which allows an implementation of the
experimental cuts used for the analysis of MU-E scattering data from the beam
polarimeter of the SMC experiment at CERN and completely analytic, which is
used for cross checks The FORTRAN code MUELA realizes formulae of both
approaches. We prove that certain experimental cuts lead to negligible
radiative corrections in the muon beam polarization experiment.


title:
Nonperturbative Violation of Factorial Moments Scaling in Dissipative
  QCD jets

abstract:
  The nonperturbative modification of the evolution equation for QCD generating
functional is applied to the analysis of the factorial moments of the intrajet
particle distributions in QCD. Nonperturbative preasymptotic correction to the
factorial moments scaling (F-scaling) is calculated. The results are compared
with the available experimental data. The data show the possible presence of
such a nonperturbative effect.


title: Event Orientation in e+e- Annihilation

abstract:
  We review the orientation of e+e- \to q\bar q g events in terms of the polar
and azimuthal angles of the event plane w.r.t. the electron beam direction. The
asymmetry of the azimuthal-angle distribution is, like the left-right
forward-backward polar-angle asymmetry, sensitive to parity-violating effects
in three-jet events; these are presently being explored experimentally. We
present these observables at O(\alpha_s) in perturbative QCD and discuss their
dependence on longitudinal beam polarisation and c.m. energy. A moments
analysis in terms of the orientation angles allows a more detailed test of QCD
by isolating the independent helicity cross-sections.


title: Problems with proton in the QCD dipole picture

abstract:
  The soft gluon part of a proton wave function is investigated and compared
with an onium case. It is argued that at every step of the gluon cascade new
color structures appear. Dipole equation kernel emerges when a diquark limit is
assumed.


title: Radiation Zeros in High-Energy $e^+e^-$ Annihilation into Hadrons

abstract:
  The process $e^+e^- \to q \bar q \gamma$ contains radiation zeros, i.e.
configurations of the four-momenta for which the scattering amplitude vanishes.
We calculate the positions of these zeros for $u$--quark and $d$--quark
production and assess the feasibility of identifying the zeros in experiments
at high energies. The radiation zeros are shown to occur also for massive
quarks, and we discuss how the $b \bar b \gamma$ final state may offer a
particularly clean environment in which to observe them.


title: Next-to-leading order slepton pair production at hadron colliders

abstract:
  We compute total cross sections for various slepton pair production reactions
in next-to-leading order QCD. For pbarp collisions at root S=2TeV, we find
leading order cross sections to be enhanced by typically 35% to 40%. For pp
collisions at root S=14TeV, the enhancement ranges from 25% to 35% depending on
the mass of the sleptons. We comment upon the phenomenological implications of
these results.


title: The Inflaton As Dark Matter

abstract:
  Within the framework of an explicit dynamical model, in which we calculate
the radiatively-corrected, tree-level potential that sets up inflation, we show
that the inflaton can be a significant part of dark matter today. We exhibit
potentials with both a maximum and a minimum. Using the calculated position of
the potential minimum, and an estimate for fluctuations of the inflaton field
in the early universe, we calculate a contribution to the matter energy density
of $(1-2)\times 10^{-47}\GeV^4$ in the present universe, from cold inflatons
with mass of about $6\times 10^9\GeV$. We show that the inflaton might decay in
a specific way, and we calculate a possible lifetime that is several orders of
magnitude greater than the present age of the universe. Inflaton decay is
related to an interaction which, together with a spontaneous breakdown of CP
invariance at a cosmological energy scale, can give rise to a
neutrino-antineutrino asymmetry just prior to the time of electroweak symmetry
breaking.


title: Nucleon Strangeness: Theory

abstract:
  The status of theoretical calculations of the strange quark vector current
form factors of the nucleon is reviewed.


title:
Mass spectrum of orbitally and radially excited heavy-light mesons in
  the relativistic quark model

abstract:
  The mass spectrum of orbitally and radially excited states of B and D mesons
is calculated in the framework of the relativistic quark model. The expansion
in inverse powers of the heavy quark mass is carried out up to the first order,
while the light quark is treated without expansion. We find that the
relativistic treatment of the light quark plays an important role. Different
patterns of P level inversion are discussed. The obtained masses of orbitally
and radially excited states are in accord with available experimental data and
heavy quark symmetry relations.


title: Electroweak Symmetry Breaking via Top Condensation Seesaw

abstract:
  We propose a new mechanism in which all of the electroweak symmetry breaking
is driven by a natural top quark condensate, produced by topcolor interactions
at a multi-TeV scale. The scheme allows the observed top quark mass, and
acceptable T and S parameters, by invoking a seesaw mechanism involving mixing
of the top with an additional isosinglet quark.


title: Heavy Quarkonium Production and Propagation in Nuclei

abstract:
  We describe a precursor in heavy quarkonium production in terms of a coherent
admixture of states of different color, spin, and angular momentum quantum
numbers, and obtain the production amplitudes for different quarkonium bound
states by projecting out this precursor state onto these bound states. The
precursor is absorbed in its passage through a nucleus in a pA reaction, and
the total cross section between this precursor with a nucleon can be calculated
with the two-gluon model of the Pomeron. Such a description of coherent
precursors and their subsequent interactions with nucleons can explain many
salient features of J/psi and psi' production in pA collisions.


title: V-A Constraint on a Product of R-parity Violating Couplings

abstract:
  We study in the framework of R-parity violating supersymmetric theories the
effect of R-parity violation due to the operator L_i L_j \bar{E_k} on the (V-A)
structure of the muon decay. The precisely measured muon decay parameters can
constrain a product of R-parity violating couplings:
|\lambda_{232}\lambda_{131}| < 0.022 at the 90% CL, which is complementary to
the previous limits obtained by the e-\mu universality in \tau decay.


title: Twenty Open Questions in Supersymmetric Particle Physics

abstract:
  We give a brief overview of 20 open theoretical questions in supersymmetric
particle physics. The 20 questions we have chosen range from the GeV scale to
the Planck scale, and include issues pertaining to the Minimal Supersymmetric
Standard Model and its extensions, SUSY-breaking, cosmology, grand unified
theories, and string theory. Throughout, our goal is to address those topics in
which supersymmetry plays a fundamental role, and which are areas of active
research in the field. This survey is written at an introductory level and is
aimed at people who are not necessarily experts in the field.
  (To appear as an Overview Chapter in the review volume "Perspectives on
Supersymmetry", edited by G. Kane, to be published by World Scientific.)


title: HQET and Semileptonic Form Factors

abstract:
  (Contribution to Proceedings of the Seventh International Symposium On Heavy
Flavor Physics, July 7-11, 1997, Santa Barbara.) Theoretical approaches to form
factors of semileptonic decays are discussed in application to $B \ra D +
l+\bar \nu_l$ decay.


title: Lepton CP Asymmetry in B Factories: \epsilon_B and New Physics

abstract:
  In this talk, we first make some brief comments on the phase-convention
dependence of the CP-violating parameter \epsilon_B. A simple framework is then
presented for analyzing new physics contributions to B^0-\bar{B}^0 mixing and
their effects on the lepton CP asymmetry, a promising signal to be further
searched for in the first-round experiments of B factories.


title: Radiative Leptonic Decays of $B_c $ Meson

abstract:
  To the leading order, the radiative leptonic decays $B_c \to \gamma \ell \bar
\nu$ ($ \ell=e, \mu$) are studied carefully. In the study, a non-relativistic
constituent quark model and the effective Lagrangian for the heavy flavour
decays are used. As a result, the branching ratios turn out to be of the orders
of $10^{-5}$ for $B_c \to \gamma \mu \bar \nu $ or for $B_c \to \gamma e \bar
\nu $. Based on this study, we point out the decays being accessible
experimentally at the future LHC, and the possibility to determine the decay
constant $f_{B_c}$ through the radiative decays.


title: Isospin Splittings of Baryons

abstract:
  We discuss the isospin-breaking mass differences among baryons, with
particular attention in the charm sector to the $\Sigma_c^{+}-\Sigma_c^0$,
$\Sigma_c^{++}-\Sigma_c^0$, and $\Xi_c^+-\Xi_c^0$ splittings. Simple potential
models cannot accommodate the trend of the available data on charm baryons.
More precise measurements would offer the possibility of testing how well
potential models describe the non-perturbative limit of QCD.


title:
Multiparticle production in small-x deep inelastic scattering and the
  nature of the Pomeron

abstract:
  Properties of multiparticle final states produced in the central rapidity
region of small-x deep inelastic scattering (DIS) are discussed. It is pointed
out that these properties contain important information on the nature of the
Pomeron - used for the description of total cross section and diffractive
production in DIS. It is shown that models based on universality of the Pomeron
predict charged particle multiplicities in small-x DIS which are in good
agreement with recent HERA results.


title: Proposal of unified fermion texture

abstract:
  A unified form of mass matrix is proposed for neutrinos, charged leptons, up
quarks and down quarks. Some constraints for the parameters involved are tent%
atively postulated. Then, the predictions are neatly consistent with available
experimental data. Among the predictions are: (i) $ m_\tau \simeq 1776.80 $~MeV
(with the inputs of $ m_e $ and $ m_\mu $), (ii) $ m_{\nu_0} \ll m_{\nu_1} \sim
(0.6 to 4)\times 10^{-2} $eV and $ m_{\nu_2} \sim (0.2 to 1)\times 10^{-1} $eV
(with the atmospheric-neutrino inpu% ts of $ |m_{\nu_2}^2 - m_{\nu_1}^2| \sim
(0.0003 to 0.01) eV ^2 $ and the $\nu_\mu \to \nu_\tau $ oscillation amplitude
$\sim 0.8 $), and also (iii) $ m_s \simeq 270 MeV$, $|V_{ub}/V_{cb}| \simeq
0.082 $ and arg$V_{ub} \simeq -64^\circ $ (with the inputs of $ m_c = 1.3 $
GeV, $ m_b = 4.5 $ GeV, $|V_{us}| = 0.221 $ and $|V_{cb}| = 0.041 $, where $
m_u \ll m_c \ll m_t $ and $ m_d \ll m_s \ll m_b $). All elements of the \CKM
matrix are evaluated. All elements of its lepton counterpart are calculated up
to an unknown phase (Appendix B). Some items related to dynamical aspects of
the proposed fermion "texture" are briefly commented on (Appendix A). In
particular, the notion of a novel dark matter, free of any Standard--% Model
interactions (and their supersymmetric variants), appears in the case of preon
option.


title: Delta-Isobar Production in Antiproton Annihilation on the Deuteron

abstract:
  The annihilation of antiprotons on deuterons at rest are investigated for the
case when pion-nucleon and pion-delta-isobar pairs are produced. The two-step
mechanism is investigated by analysing these processes when either neutral
particles and charged ones are produced. Some predictions for the branching
ratios are presented.


title:
Two-Loop Electroweak Heavy-Fermion Corrections to Higgs-Boson Production
  and Decay

abstract:
  The dominant electroweak corrections to the production cross sections and
partial decay widths of a light Standard-Model Higgs boson, with mass M_H <<
2m_t, are due to top-quark loops. By means of a low-energy theorem, we study at
the two-loop level the leading shifts in the Higgs-boson couplings to pairs of
light fermions and gauge bosons induced by a sequential isodoublet of high-mass
fermions. For tree-level and loop-induced Higgs-boson couplings, these
corrections are of relative orders O(G_mu^2 m_F^4) and O(G_mu m_F^2),
respectively, where m_F represents a generic heavy-fermion mass, with m_F >>
M_W, M_H. Except for the Hbb-bar coupling, all results carry over to the case
of the top-quark-induced corrections. We discuss possible phenomenological
consequences of our results.


title:
Non-Perturbative Models For The Quantum Gravitational Back-Reaction On
  Inflation

abstract:
  We consider a universe in which inflation commences because of a positive
cosmological constant, the effect of which is progressively screened by the
interaction between virtual gravitons that become trapped in the expansion of
spacetime. Perturbative calculations have shown that screening becomes
non-perturbatively large at late times. In this paper we consider effective
field equations which can be evolved numerically to provide a non-perturbative
description of the process. The induced stress tensor is that of an effective
scalar field which is a non-local functional of the metric. We use the known
perturbative result, constrained by general principles and guided by a physical
description of the screening mechanism, to formulate a class of ansatze for
this functional. A scheme is given for numerically evolving the field equations
which result from a simple ansatz, from the beginning of inflation past the
time when it ends. We find that inflation comes to a sudden end, producing a
system whose equation of state rapidly approaches that of radiation. Explicit
numerical results are presented.


title: J/psi Suppression as a Signal for the Quark-Gluon Plasma

abstract:
  We review the search for the quark-gluon plasma using the signal of the
suppression of J/psi production in high-energy heavy-ion collisions. Recent
observations of anomalous J/psi suppression in high-energy Pb-Pb collisions
observed by the NA50 Collaboration are examined and compared with earlier
results from pA and nucleus-nucleus collisions with heavy ions of smaller mass
numbers. The anomalous suppression of J/psi production in Pb-Pb collisions can
be explained as due to the occurrence of a new phase of strong J/psi
absorption, which sets in when the number of nucleon-nucleon collisions at a
spatial point exceeds about 4 and corresponds to a local energy density of
about 3.4 GeV/fm**3.


title: The weight for random quark masses

abstract:
  In theories in which the parameters of the low energy theory are not unique,
perhaps having different values in different domains of the universe as is
possible in some inflationary models, the fermion masses would be distributed
with respect to some weight. In such a situation the specifics of the fermion
masses do not have a unique explanation, yet the weight provides the visible
remnant of the structure of the underlying theory. This paper introduces this
concept of a weight for the distribution of masses and provides a quantitative
estimate of it from the observed quarks and leptons. The weight favors light
quark masses and appears roughly scale invariant (rho ~ 1/m). Some relevant
issues, such as the running of the weight with scale and the possible effects
of anthropic constraints, are also discussed.


title: Decays of the Higgs Bosons

abstract:
  We review the decay modes of the Standard Model Higgs boson and those of the
neutral and charged Higgs particles of the Minimal Supersymmetric extension of
the Standard Model. Special emphasis will be put on higher-order effects. [Talk
given at the International Workshop on Quantum Effects in the MSSM. Barcelona,
Spain, September 9-13, 1997.]


title:
Search for Higgs Boson at LHC in the Reaction pp->gamma+gamma+jet at a
  Low Luminosity

abstract:
  We discuss the SM Higgs discovery potential of the LHC in the channel
pp->H+jet->gamma+gamma+jet when the jet is observed at sufficiently high Pt and
a small rapidity to be reliably identified. We calculate all the signal
subprocesses and the irreducible background with realistic kinematical cuts.
The reducible QCD background is also estimated. We conclude that the channel
gamma+gamma+jet can give about 120-200 signal events for Higgs mass MH=100-140
GeV at the integrated luminosity of 30 inverse fb. This signal rate should be
compared with only 330-600 events for the irreducible background per two-photon
invariant mass interval of 2 GeV. We estimate the QCD reducible background at
the level of 20% of the irreducible one. Thus, one may hope that the Higgs
boson can be discovered already during the LHC operation at a low luminosity.
At a high luminosity the observation of several hundreds of high Pt Higgs
bosons in this channel will be possible with significance higher than 15 for
L=100 inverse fb.


title: New Solutions for Scalar-Isoscalar pi-pi Phase Shifts

abstract:
  The scalar-isoscalar pi-pi phase shifts are calculated in the pi-pi energy
range from 600 MeV to 1600 MeV. We use results of the CERN-Cracow-Munich
collaboration for the reaction pi^- p --> pi^+ pi^- n on a transversely
polarized target at 17.2 GeV/c pi^- momentum. Energy-independent separation of
the S-wave pseudoscalar amplitude (pi exchange) from the pseudovector amplitude
(a_1 exchange) is carried out. Below the KK threshold we find two solutions for
the pi-pi phase shifts, for which the phases increase slower with the effective
pi-pi mass than the P-wave phases ("flat" solutions) and two solutions for
which the phases increase faster than the P-wave phases ("steep" solutions).
Above 1420 MeV both sets of phase shifts increase with energy faster than in
the experiment on an unpolarized target. This fact can be related to a presence
of the scalar resonance f_0(1500).


title: Analysis of New Results For Scalar-Isoscalar pi-pi Phase Shifts

abstract:
  The scalar -- isoscalar pi-pi phase shifts are analysed using a separable
potential model of three coupled channels (pipi, KK and an effective 2pi2pi
system). Model parameters are fitted to two sets of solutions obtained in a
recent analysis of the CERN-Cracow-Munich measurements of the pi^- p --> pi^+
pi^- n reaction on a polarized target. A relatively narrow (90 -- 180 MeV)
scalar resonance f_0(1400-1460) is found, together with a wide f_0(500) (Gamma
= 500 MeV) and the narrow f_0(980) state.


title: Minimal SU(5) Resuscitated by Long-Lived Quarks and Leptons

abstract:
  The issue of gauge unification in the (non-supersymmetric) Standard Model is
reinvestigated. It is found that with just an additional fourth generation of
non-sequential and long-lived quarks and leptons, SU(3)xSU(2)xU(1) gauge
couplings converge to a common point of approximately 3.5x10^{15} GeV
(corresponding to a proton lifetime of approximately 10^{34 plus/minus 1}
years). This result is due to the non-negligible- but still perturbative-
contributions of the top and fourth generation Yukawa couplings to the gauge
two-loop beta functions, in contrast with the three generation case where such
a contribution is too small to play an important role in unification.


title:
Cross Section Fluctuations of Photon Projectile in Generalized Vector
  Meson Dominance Model

abstract:
  We explain that the generalized vector meson dominance (GVMD) model is
successful in describing hard high energy processes because it contains
expected in QCD Color Coherent Phenomena. Within the model, which reproduces
Bjorken scaling and nuclear shadowing for deep inelastic processes, we
calculate $P_{\gamma}(\sigma,Q^2)$, the probability for the photon to interact
with a target with the cross section $\sigma$. We find that within the GVMD
model the virtual photon has two main components: the ''hard'' one with the
small cross section of the order of $1/Q^2$ and the high probability and the
''soft'' one with a typical hadronic cross section with the probability
suppressed by the factor of $1/Q^2$. Thus the GVDM model produces
$P_{\gamma}(\sigma,Q^2)$ similar to that within the parton model and suggests
the conspiracy between hard and soft QCD at $Q^2 > 1$ GeV$^2$.
  We study the limit $\sigma \to 0$ and show, that $P_{\gamma}(\sigma,Q^2)
\propto 1/ \sigma$ in both GVMD model and QCD. Thus similarly to the parton
model the GVMD model predicts the Color Transparency phenomenon. This is an
indirect indication that Bjorken scaling, Color Transparency and shadowing in
nuclei in DIS are closely related.


title: Hunting Down Interpretations of the HERA Large-Q^2 data

abstract:
  Possible interpretations of the HERA large-Q^2 data are reviewed briefly. The
possibility of statistical fluctuations cannot be ruled out, and it seems
premature to argue that the H1 and ZEUS anomalies are incompatible. The data
cannot be explained away by modifications of parton distributions, nor do
contact interactions help. A leptoquark interpretation would need a large tau-q
branching ratio. Several R-violating squark interpretations are still viable
despite all the constraints, and offer interesting experimental signatures, but
please do not hold your breath.


title:
Scaling Distribution of Axionic Strings and Estimation of Axion Density
  from Axionic Domain Walls

abstract:
  The damping of the axionic string motion due to the surrounding plasma is
estimated by a detailed calculation of the fermion scatter from a global string
and it is shown that the friction force on the string can be neglected before
the axionic domain wall formation in most cases, which is one of the important
necessary conditions for the scaling distribution of the strings. The energy
density of the axion produced by the collapse of the axionic domain walls is
also evaluated using the axionic string distribution, and it is found to be
larger or at least comparable to the axion density which originates from the
axionic strings.


title: The Standard Model of particle physics

abstract: A brief review of the Standard Model of particle physics is presented.


title:
The Role of Scalar and Pseudoscalar Fields in Determining
  Nucleosynthesis Bounds on the Scale of Supersymmetry Breaking

abstract:
  The effect of spin-0 goldstino superpartners is considered on the
nucleosynthesis bounds arising when a superlight gravitino appears as an
effective massless neutrino species. When the scalar and pseudoscalar
superpartners are relativistic they will decouple at much later times than the
goldstino and consequently will be the dominant effect when obtaining a
nucleosynthesis bound on the scale of supersymmetry breaking. Assuming that the
scalar and pseudoscalar fields decouple at a temperature no later than O(100)
MeV, then typically the scale of supersymmetry breaking \sqrt{F} > 60 TeV. This
corresponds to a lower bound on the gravitino mass m_{3/2} > 1 eV.


title:
Modelling the QCD Phase Transition with an Effective Lagrangian of Light
  and Massive Hadrons

abstract:
  The temperature dependence of quark and gluon condensates in QCD as precursor
of the chiral and deconfining phase transition is modelled with a conformally
extended non-linear sigma-model including broken chiral and scale invariance.
The model is further enlarged by including (free) heavier hadrons. Within this
frame we then study the interplay of QCD scale breaking effects and heavier
hadrons in chiral symmetry restoration.


title: QCD coherence in deep inelastic scattering at small x at HERA

abstract:
  QCD coherence effects in initial state radiation at small x in deep inelastic
scattering in HERA kinematics are studied with the help of the Monte Carlo
model SMALLX. Theoretical assumptions based on the CCFM evolution equation are
reviewed and the basic properties of the partonic final states are
investigated. The results are compared with those obtained in the conventional
DGLAP evolution scheme.


title: Light masses in short distance penguin loops

abstract:
  Penguin diagrams for decays such as $b\to (s,d)\gamma$ involve virtual loops
of $u$ or other light quarks. Logarithms of the virtual quark mass could, in
principle, influence the phenomenological analysis of the decay. It is thus
important to study these logarithms to all orders in QCD perturbation theory.
In this paper we show that, at arbitrary order, the matrix elements of
operators in the effective hamiltonian contributing to $b\to s\gamma$ are
finite for the limit of $m_u \to 0$ in penguin loops.


title: What do we actually know on the proton radius ?

abstract:
  The work is devoted to a consideration of the different determinations of the
proton charge radius. It is demonstrated that the results from the elastic
electron-proton scattering have to be of a higher uncertainty. A review of the
hydrogen Lamb shift measurements and the radius determination from them is also
presented.


title: Using Drell-Yan Processes to Probe Nucleon and Meson Structure Functions

abstract:
  We investigate how Drell-Yan processes can be used to measure the magnitude
of flavor symmetry violation in the proton sea. We examine the utility of the
following beams: protons, charged pions, and charged kaons. In each case we
present an approximate expression for the Drell-Yan asymmetry. Using currently
available parton distributions, we locate those kinematic regions which provide
the greatest information on the quantity $\bar{d}^p(x) - \bar{u}^p(x)$. If
sufficiently intense $K^+$ beams were available, they could provide an
efficient measurement of this quantity. Finally we present and discuss sets of
sum rules for the Drell-Yan processes.


title: CP asymmetries in B0 decays in the left-right model

abstract:
  We study time dependent CP asymmetries in B^0_{d,s} decays in the left-right
model with spontaneous breakdown of CP. Due to the new contributions to
B^0-\bar B^0 mixing the CP asymmetries can be substantially modified. Moreover,
there can be significant new contributions to the $B$-meson decay amplitudes
from the magnetic penguins. Most promising for detection of the new physics in
the planned $B$ factories is that the CP asymmetries in the decays B--> J/\psi
K_S and B--> \phi K_S which are supposed to be equal in the standard model can
differ significantly in this class of models independently of the results in
the measurements of B--> X_s \gamma.


title: QCD Sum Rules Calculation of Heavy $\Lambda$ Semileptonic Decay

abstract:
  We set up sum rules for heavy lambda decays in a full QCD calculation which
in the heavy quark mass limit incorporates the symmetries of heavy quark
effective theory. For the semileptonic $\La_c$ decay we obtain a reasonable
agreement with experiment. For the $\La_b$ semileptonic decay we find at the
zero recoil point a violation of the heavy quark symmetry of about 20%.


title:
New Relations and Constraints on Quark Spin-flavor Contents in
  Symmetry-breaking Chiral Quark Model

abstract:
  New relations between the quark spin-flavor contents of the nucleon and axial
weak coupling constants are obtained in the chiral quark model with both SU(3)
and U(1)-breaking effects. Using the nonsinglet spin combinations, $\Delta_3$
and $\Delta_8$, all spin-flavor observables are functions of only one parameter
$a$ $-$ probability for the chiral pionic fluctuation. The upper and lower
bounds of these observables are given. The optimal range of $a$, determined by
NMC data $\bar d-\bar u$, gives a constraint to the cutoff of the chiral quark
field theory. The model predictions are in good agreement with the existing
data in this range of $a$. The roles of kaon, $\eta$ and $\eta'$ are also
discussed.


title:
The dependence of strange hadron multiplicities on the speed of
  hadronization

abstract:
  Hadron multiplicities are calculated in the ALCOR model for the Pb+Pb
collisions at CERN SPS energy. Considering the newest experimental results, we
display our prediction obtained from the ALCOR model for stable hadrons
including strange baryons and anti-baryons.


title: On the Interactions of Light Gravitinos

abstract:
  In models of spontaneously broken supersymmetry, certain light gravitino
processes are governed by the coupling of its Goldstino components. The rules
for constructing SUSY and gauge invariant actions involving the Goldstino
couplings to matter and gauge fields are presented. The explicit operator
construction is found to be at variance with some previously reported claims. A
phenomenological consequence arising from light gravitino interactions in
supernova is reexamined and scrutinized.


title:
Angular and Energy Distribution in Neutralino Production and Decay with
  complete Spin Correlations

abstract:
  We study the process e^{-}e^{+} \to \tilde{\chi}^0_1\tilde{\chi}^0_2 with the
subsequent decay \tilde{\chi}^0_2 \to \tilde{\chi}^0_1 \ell^{+}\ell^{-} taking
into account the complete spin correlations between production and decay. We
present numerical results for the lepton angular distribution and the
distribution of the opening angle between the outgoing leptons for \sqrt{s}=182
GeV. We examine representative mixing scenarios in the MSSM and study the
influence of the common scalar mass parameter m_0. For the lepton angular
distribution the effect of the spin correlations amounts to up to 20%. The
shape of the lepton angular distribution is very sensitive to the mixing in the
gaugino sector and to the value of m_0. We find that the opening angle
distribution is suitable for distinguishing between Higgsino-like and
gaugino-like neutralinos.


title: Probabilistic Jet Algorithms

abstract:
  Conventional jet algorithms are based on a deterministic view of the
underlying hard scattering process. Each outgoing parton from the hard
scattering is associated with a hard, well separated jet. This approach is very
successful because it allows quantitative predictions using lowest order
perturbation theory. However, beyond leading order in the coupling constant,
when quantum fluctuations are included, deterministic jet algorithms will
become problematic precisely because they attempt to describe an inherently
stochastic quantum process using deterministic, classical language. This
demands a shift in the way we view jet algorithms. We make a first attempt at
constructing more probabilistic jet algorithms that reflect the properties of
the underlying hard scattering and explore the basic properties and problems of
such an approach.


title: Determination of the CKM matrix by semileptonic rare B-decays

abstract:
  The possibility to test the unitarity triangle of CKM matrix is examined by
using the semileptonic rare $B$ decays, $B \rightarrow X_q \, \l^+ \, \l^-$
with $q = d, s$ and $\l$'s are leptons. The discussion is emphasized on the CP
asymmetry in the framework of standard and beyond the standard models. For the
beyond standard model, a minimal extension of the standard model containing an
additional isosinglet charge (-1/3) charge quark, which leads to a deviation
from CKM unitarity, is considered. As the results, in the standard model the CP
asymmetry is visible only for $B \rightarrow X_d \, \l^+ \, \l^-$, while in the
latter model it is sizeable even for $B \rightarrow X_s \, \l^+ \, \l^-$.


title: Four-Fermi Effective Operators in Top-Quark Production and Decay

abstract:
  Effects of four-Fermi-type new interactions are studied in top-quark pair
production and their subsequent decays at future e^+e^- colliders.
Secondary-lepton-energy distributions are calculated for arbitrary longitudinal
beam polarizations. An optimal-observables procedure is applied for the
determination of new parameters.


title: The search for sleptons and flavour lepton number violation at LHC (CMS)

abstract:
  We study a possibility to detect sleptons and flavour lepton number violation
at LHC (CMS). We investigate the production and decays of right- and
left-handed sleptons separately. We have found that for L = 10**5 1/pb it would
be possible to discover right-handed sleptons with a mass up to 350 GeV and
left-handed ones with a mass up to 350 GeV. We also investigate a possibility
to look for flavour lepton number violation in slepton decays due to the mixing
of different generations sleptons. We find that for the maximal (smu_R - se_R)
mixing it is possible to detect such effect for sleptons with a mass up to 250
GeV.


title:
Supersymmetric Left-Right Model and Light Doubly Charged Higgs Bosons
  and Higgsinos

abstract:
  We point out that in a large class of supersymmetric left-right models with
automatic R-parity conservation there are a pair of light doubly charged Higgs
bosons and Higgsinos. Requiring the mass of these particles to satisfy the LEP
Z-width bound implies that $W_R$ mass must be above $10^{9}$ GeV.


title:
Radiative Tau Lepton Pair Production as a Probe of Anomalous
  Electromagnetic Couplings of the Tau

abstract:
  We calculate the squared matrix element for the process e+ e- --> tau+ tau-
gamma allowing for anomalous magnetic and electric dipole moments at the tau
tau gamma vertex. No interferences are neglected and no approximations of light
fermion masses are made. We show that anomalous moments affect not only the
cross section, but also the shape of the photon energy and angular
distributions. We also demonstrate that in the case of the anomalous magnetic
dipole moment, the contribution from interference involving Standard Model and
anomalous amplitudes is significant compared to the contribution from anomalous
amplitudes alone. A program to perform the calculation is available and it may
be employed as a Monte Carlo generator.


title:
A general parametrization for the long-range part of neutrinoless double
  beta decay

abstract:
  Double beta decay has been proven to be a powerful tool to constrain $B-L$
violating physics beyond the standard model. We present a representation for
the long-range part of the general $0\nu\beta\beta$ decay rate allowed by
Lorentz-invariance. Combined with the short range part this general
parametrization in terms of effective $B-L$ violating couplings will provide
the $0\nu\beta\beta$ limits on arbitrary lepton number violating theories.


title: Spontaneous Breaking of R-Parity

abstract:
  If supersymmetry is realized with spontaneous breaking of R-parity, there
will be important consequences in several different areas which can be tested
through different types of experiments. In this talk we review the
phenomenological implications of these theories, with special emphasis on new
signals at the present and future accelerators.


title: Neutrino self-energy and pair creation in neutron stars

abstract:
  Massless neutrino exchange leads to a new long-range force between matter.
Recently, it was claimed both that the potential energy due to this interaction
i) dominates the total energy of neutron stars and ii) that it is zero. We
recalculate the energy of a neutrino propagating in a classical, uniform
background of neutrons and find a negligible, but non-zero contribution to the
total energy of neutron stars. We estimate the neutrino pair creation rate of a
neutron star caused by a density gradient of the background neutrons but found
it too small to be observable.


title: Heavy Quark Effective Theory and Inclusive B Decays

abstract:
  I review the use of the Heavy Quark Effective Theory in the computation of
total rates and differential kinematic distributions in inclusive semileptonic
and radiative B decays. Particular attention is paid to strategies for the
extraction of V_{cb} and V_{ub}.


title: PQCD Analysis of Inclusive Heavy Hadrons Decays

abstract:
  We develop the perturbative QCD formalism for inclusive heavy hadron decays.
Transverse degrees of freedom of partons are introduced to facilitate the
factorization of the heavy hadron decays.


title:
Twist-3 and Quark Mass Contributions to the Polarized Nucleon Structure
  Function g_2(x,Q^2)

abstract:
  Quark mass effects are clarified in the parton model approach to the
transversely polarized nucleon structure function. The special propagator
technique is employed to obtain manifestly gauge invariant results and extract
the buried short-distance contributions inside the soft part after momentum
factorization in the collinear expansion approach. A generalized massive
special propagator for a massive quark is constructed. We identify the
corresponding matrix elements of the transversely polarized structure function
in deep inelastic scatterings by the massive special propagator technique.


title:
Squarks Loop Corrections to the Charged Higgs Boson Pair Production in
  Photon-Photon Collisions

abstract:
  We calculate the squarks one-loop corrections to the cross sections of the
chared Higgs boson pair production in photon-photon collisions in the minimal
supersymmetric extension of standard model(MSSM). In general, in case of the
large splitting in the masses of left-top squark and the right-top squark and
for $\tan\beta$ near 1.5, the corrections can reduce the cross sections by more
than 10% for a wide range of the charged Higgs boson mass, depending on the
$e^+e^-$ center-of-mass energy. But in other cases, the corrections are at most
only a few percent. Those corrections can be comparable to the $O(\alpha
m_t^2/m_W^2)$ Yukawa corrections in previous literature.


title: Electroweak Precision Tests: A Concise Review

abstract:
  1. Introduction 2. Status of the Data 3. Precision Electroweak Data and the
Standard Model 4. A More General Analysis of Electroweak Data
  4.1 Basic Definitions and Results
  4.2 Experimental Determination of the Epsilon Variables
  4.3 Comparing the Data with the Minimal Supersymmetric Standard Model 5.
Theoretical Limits on the Higgs Mass 6. Conclusion


title: The strange-quark mass from QCD sum rules in the pseudoscalar channel

abstract:
  QCD Laplace transform sum rules, involving the axial-vector current
divergences, are used in order to determine the strange quark mass. The
two-point function is known in QCD up to four loops in perturbation theory, and
up to dimension-six in the non-perturbative sector. The hadronic spectral
function is reconstructed using threshold normalization from chiral symmetry,
together with experimental data for the two radial excitations of the kaon. The
result for the running strange quark mass, in the $\bar{MS}$ scheme at a scale
of 1 ${GeV}^{2}$ is: ${\bar m}_{s}(1 GeV^{2}) = 155 \pm 25 {MeV}$.


title:
Developments in Finite Temperature QCD on the Lattice with Dynamical
  Quarks

abstract:
  I report on some recent developments in nonperturbative studies of finite
temperature QCD with dynamical quarks on the lattice. I discuss new studies of
improved lattice actions and their application to finite temperature QCD. I
also summarize the status of lattice investigations about the order of the
finite temperature QCD transition for the case of two flavors of degenerate
light quarks, using both staggered and Wilson lattice fermions.


title: Single Pseudoscalar Meson Production in Diffractive ep Scattering

abstract:
  Exclusive pseudoscalar meson production in ep scattering at high energies is
a direct probe for a possible "odderon" exchange in soft hadronic processes.
Using a simple phenomenological ansatz for the odderon, we demonstrate how it
can be separated from the contribution due to photon-photon fusion, and the
relevant parameters be measured. Total cross sections and differential
distributions are presented for pi0, eta, eta', and eta_c production. Results
are given from both a full calculation and one using the equivalent photon
approximation. The accuracy of the latter is discussed.


title:
Contribution of $b \to sgg$ through the QCD anomaly in exclusive decays
  $B^{\pm}\to (\eta^{\prime},\eta)(K^{\pm}, K^{*\pm})$ and $B^{0}\to
  (\eta^{\prime},\eta)(K^{0},K^{*0})$

abstract:
  We compute the decay rates for the exclusive decays $B^{\pm} \to
(\eta^{\prime},\eta) (K^{\pm}, K^{*\pm})$ and $B^{0}\to (\eta^{\prime},\eta)
(K^{0}, K^{*0})$ in a QCD-improved factorization framework by including the
contribution from the process $b\to sgg \to s (\eta^{\prime}, \eta)$ through
the QCD anomaly. This method provides an alternative estimate of the
contribution $b \to s c\bar{c} \to s(\eta,\eta^\prime)$ to these decays as
compared to the one using the intrinsic charm content of the $\eta^{\prime}$
and $\eta$ mesons determined through the decays $J/\psi \to (\eta,\eta^\prime
,\eta_c) \gamma$. The resulting branching ratios are compared with the CLEO
data on $B^{\pm} \to \eta^{\prime} K^{\pm}$ and $B^{0} \to \eta^{\prime} K^{0}$
and predictions are made for the rest.


title:
Probing Hg contact interactions by gg-->H at a high energy hadron
  collider

abstract:
  In this article we study the effect of Hg contact interaction on H production
by gluon fusion at at a hadron collider. Two such d=6 operators have been
considered. The present precision for measuring \alpha_s implies a lower bound
of around 2 Tev on the scale for the CP even operator O_1. On the other hand
the precision for measuring d_n implies a lower bound of 10^5 TeV on the scale
for the CP odd operator. We show that for the above lower bound O_1 can
significantly affect the parton level cross-section for the process gg-->H.


title: Symmetries and Unification

abstract:
  Symmetries concerning the ordinary coordinate spacetime and internal
spacetime are discussed. A possible unification model of electroweak, strong
and gravitational interactions is briefly described.


title: A Covariant OBE Model for $\eta$ Production in NN Collisions

abstract:
  A relativistic covariant one boson exchange model, previously applied to
describe elastic nucleon-nucleon scattering, is extended to study $\eta$
production in NN collisions. The transition amplitude for the elementary
BN->$\eta$N process with B being the meson exchanged (B=$\pi$, $|sigma$,$\eta$,
$\rho$, $\omega$ and $\delta$) are taken to be the sum of four terms
corresponding to s and u-channels with a nucleon or a nucleon isobar
N*(1535MeV) in the intermediate states. Taking the relative phases of the
various exchange amplitudes to be +1, the model reproduces the cross sections
for the $NN\to X\eta$ reactions in a consistent manner. In the limit where all
$\eta$'s are produced via N^* excitations, interference terms between the
overall contributions from the exchange of pseudoscalart and scalar mesons with
that of vector mesons cancel out. Consequently, much of the ambiguities in the
model predictions due to unknown relative phases of different vector
pseudoscalar exchanges are strongly reduced.


title: Updated Combined Fit of Low Energy Constraints to Minimal Supersymmetry

abstract:
  The new precise LEP measurements of alphas and the electroweak mixing angle
as well as the new LEP II mass limits for supersymmetric particles and new
calculations for the radiative (penguin) decay of the b-quark into sgamma allow
a further restriction in the parameter space of the Constrained Minimal
Supersymmetric Standard Model (CMSSM).


title:
Dynamical derivation of a quantum kinetic equation for particle
  production in the Schwinger mechanism

abstract:
  A quantum kinetic equation has been derived for the description of pair
production in a time-dependent homogeneous electric field $E(t)$. As a source
term, the Schwinger mechanism for particle creation is incorporated. Possible
particle production due to collisions and collisional damping are neglected.
The main result is a closed kinetic equation of the non-Markovian type. In the
low density approximation, the source term is reduced to the leading part of
the well known Schwinger formula for the probability of pair creation. We
compare the formula obtained with other approaches and discuss the differences.


title: Status of neutrino oscillation searches

abstract:
  The current status of neutrino oscillation searches with reactors and
accelerators is reviewed. An outlook, especially on future long baseline
neutrino oscillation projects, is given.


title: Optimal Spin Basis in Polarized Photon Linear Colliders

abstract:
  We analyze the spin correlations of the top quark pairs produced at Photon
Linear Colliders. We employ the circular polarized photon beams and general
spin basis for the top quark pair. We consider general spin bases to find a
strong spin correlation between produced top quark and anti-top quark. We show
the cross-section in these bases and discuss the characteristics of results.


title: SUSY induced CP violation in e+e- to t\bar{t}

abstract:
  The CP violating electric and weak dipole moment form factors of the top
quark, $\dgs$ and $\dzs$, appear in the process \mbox{$e^{+}e^{-} \to t
\bar{t}$}. We present a complete analysis of these dipole moment formfactors
within the Minimal Supersymmetric Standard Model with complex parameters. We
include gluino, chargino, and neutralino exchange in the loop of the
\mbox{$\gamma t\bar{t}$} and \mbox{$Z t\bar{t}$} vertex. We give analytic
expressions and present numerical results for the asymmetries that measure
these formfactors.


title: Search for New Physics with Neutrinoless Double Beta Decay

abstract:
  Neutrinoless double beta decay ($0\nu\beta\beta$) is one of the most
sensitive approaches to test particle physics beyond the standard model. During
the last years, besides the most restrictive limit on the effective Majorana
neutrino mass, the analysis of new contributions by the Heidelberg group led to
bounds on left-right-symmetric models, leptoquarks and R-parity violating
models competitive to recent accelerator limits, which are of special interest
in view of the HERA anomaly at large $Q^2$ and $x$. These new results deduced
from the Heidelberg-Moscow double beta decay experiment are reviewed. Also an
outlook on the future of double beta decay, the GENIUS proposal, is given.


title:
Compton tensor with heavy photon in the case of longitudinally polarized
  fermion

abstract:
  The matrix element squared for Compton scattering of a heavy photon on a
longitudinally polarized electron is calculated. The gauge-invariant tensor
structure of the heavy photon polarization is considered, assuming that all
kinematical invariants and the invariant mass of the heavy photon are large
compared with the electron mass. The expressions for the Born and first order
radiative corrections are obtained. Applications are discussed.


title: New constraints on the tau neutrino mass and fourth generation mixing

abstract:
  We present new constraints on the mass $m_{\nu_\tau}$ of the tau neutrino and
its mixing with a fourth generation neutrino. From an analysis of the partial
widths of tau lepton decays we obtain the following bounds at the 90%
confidence level: $m_{\nu_\tau} < 32$ MeV and $\sin^2\theta < 0.007$, where
$\theta$ describes the Cabibbo-like mixing of the third and fourth generation
neutrinos.


title:
Anomalous charged current couplings of the tau and implications for tau
  compositeness and two-Higgs doublet models

abstract:
  The leptonic branching fractions of the tau lepton are sensitive to anomalous
charged current interactions. We use recent experimental measurements to
determine the weak charged current magnetic and electric dipole moments and the
Michel parameter $\eta$ with unprecedented precision. These results are then
used to constrain the tau compositeness scale and the allowed parameter space
for Higgs doublet models.


title:
Four-jet angular distributions and color charge measurements: leading
  order versus next-to-leading order

abstract:
  We present the next-to-leading order perturbative QCD prediction to the
four-jet angular distributions used by experimental collaborations at LEP for
measuring the QCD color charge factors. We compare our results to ALEPH data
corrected to parton level. We perform a leading order ``measurement'' of the
QCD color factor ratios by fitting the leading order perturbative predictions
to the next-to-leading order result. Our result shows that in an experimental
analysis for measuring the color charge factors the use of the O($\alpha_s^3$)
QCD predictions instead of the O($\alpha_s^2$) results may shift the center of
the fit by a relative factor of $1+2\as$ in the $T_R/C_F$ direction.


title: Running charm quark mass versus M_D and the D_(s) into \mu\nu decay

abstract:
  I study (for the first time) the dependence of M_D and of the leptonic decay
constant f_D on the variation of the running charm quark mass m_c(\nu). I
conclude that the present data on f_{D_s} from D_s into \mu\nu decay give a
weaker constraint than M_D, where the latter leads to the result,
m_c(M_c)=(1.08\pm 0.11) GeV, to two-loop accuracy in the {MS}-bar scheme, in
good agreement with the value m_c(M_c)=(1.23^{+0.04}_{-0.05}) GeV extracted
directly, within the same approximation, from M_{J/\psi}. The agreement of the
corresponding perturbative pole mass with the one extracted directly from the
data can indicate that the non-perturbative effects to the pole mass are
negligible. Inversely, injecting the average value of m_c(M_c) from M_D and
M_{J/\psi} into the m_c behaviour of f_D, I obtain f_D\simeq (1.52\pm
0.16)f_\pi, which combined with the sum rule prediction for f_{D_s}/f_D, gives
f_{D_s}\simeq (1.75\pm 0.18)f_\pi in good agreement with the data. The
extension of the analysis to the case of f_B and f_{D^*} is discussed.


title:
Central pseudoscalar production in pp scattering and the gluon
  contribution to the proton spin

abstract:
  Central pseudoscalar production in $pp$ scattering is suppressed at small
values of $Q_\perp$, where $Q$ is defined as the difference between the momenta
transferred from the two protons. Such a behaviour is expected if the
production occurs through the fusion of two vectors. Photon exchange could
provide the dominant contribution at low transferred momenta, but we argue that
an extension of the experiment could probe the gluon contribution to the proton
spin.


title: Photo-- and Electroproduction of $J^{PC}=1^{-+}$ exotics

abstract:
  We estimate the kinematic dependence of the exclusive photo-- and
electroproduction of $J^{PC}=1^{-+}$ exotic mesons due to $\pi$ exchange. We
show that the kinematic dependence is largely independent of the exotic meson
form factor, which is explicitly derived for a $1^{-+}$ isovector hybrid meson
in the flux-tube model of Isgur and Paton. The relevance to experiments
currently planned at Jefferson Lab is indicated.


title:
Composite Quarks and Leptons from Dynamical Supersymmetry Breaking
  without Messengers

abstract:
  We present new theories of dynamical SUSY breaking in which the strong
interactions that break SUSY also give rise to composite quarks and leptons
with naturally small Yukawa couplings. In these models, SUSY breaking is
communicated directly to the composite fields without ``messenger''
interactions. The compositeness scale can be anywhere between 10 TeV and the
Planck scale. These models can naturally solve the supersymmetric flavor
problem, and generically predict sfermion mass unification independent from
gauge unification.


title: Matter-Enhanced Neutrino Oscillations in the Quasi-Adiabatic Limit

abstract:
  We introduce simple analytic expressions for the neutrino survival
probability in media valid in the quasi-adiabatic limit. These expressions
provide a quick but accurate alternative to numerical solution of the neutrino
propagation equations for the Mikheyev-Smirnov-Wolfenstein effect. They can
also be used to extract information about the density scale height from the
neutrino data. As an example, we present calculations for solar neutrinos.


title: Amplitude analysis of hadron decays

abstract:
  We provide succinct covariant amplitude decompositions of 2-body weak
hadronic decays, with which to compare data, including exclusive rates,
helicity amplitudes and polarizations. For weak decays, the systematic
dependence of these amplitudes on masses and quantum numbers of participating
particles are determined within a factor of about two by the CKM angles and the
Fermi constant so theoretical models need to be much more accurate if they are
to be convincing.


title: A Supersymmetric Resolution of Solar and Atmospheric Neutrino Puzzles

abstract:
  Renormalizable lepton number violating interactions that break R-parity can
induce a Majorana mass for neutrinos. Based on this, we show that it is
possible to obtain a phenomenologically viable neutrino mass matrix that can
accommodate atmospheric neutrino data via $\nu_{\mu}$--$\nu_{\tau}$ mixing and
the solar neutrino data via either the large or small angle MSW effect. We
argue that such a mass matrix could result from an approximate discrete
symmetry of the superpotential that forbids renormalizable baryon number
violating couplings.


title: Search for the next-to-lightest neutralino

abstract:
  We study the inclusive production of the next-to-lightest neutralino chi2,
decaying directly, or via slepton, into two leptons and the lightest
neutralino. The dilepton invariant mass spectrum in these decays has a
characteristic sharp edge near the kinematical upper limit. We propose to
exploit this feature as a search strategy for the chi2, and thereby for SUSY.
The possibilities to determine neutralinos and slepton masses are also
discussed.


title: Search for Anomalous Top--Quark Interaction at LEP-2 Collider

abstract:
  We show that a search for $e^+ e^- \to t \bar q$ $(\bar q = \bar c, \bar u)$
events at LEP--2 collider provide a possibility to improve significantly the
modern constraints on coupling constants of anomalous $t$--quark interaction
via flavor--changing neutral currents.


title:
Renormalization of gauge-invariant operators for the structure function
  g_2(x, Q^{2})

abstract:
  We investigate the nucleon's transverse spin-dependent structure function
g_2(x, Q^{2}) in the framework of the operator product expansion and the
renormalization group. We construct the complete set of the twist-3 operators
for the flavor singlet channel, and give the relations among them. We develop
an efficient, covariant approach to derive the anomalous dimension matrix of
the twist-3 singlet operators by computing the off-shell Green's functions. As
an application, we investigate the renormalization mixing for the lowest moment
case, including the operators proportional to the equations of motion as well
as the ``alien'' operators which are not gauge-invariant.


title: Perturbative universality in QCD jet physics

abstract:
  I survey some recent advances in the applications of the analytical
perturbative approach to the description of particle distributions in multi-jet
processes. New tests of the perturbatively based picture in the (semi) soft
region are discussed.


title:
Towards common origin of supersymmetry breaking, compositeness, and
  gauge mediation

abstract:
  We present a toy model which has the following properties: i) it is strongly
coupled at a certain scale and breaks supersymmetry at this scale; ii) matter
superfields of (one generation of) the Standard Model are effective low energy
degrees of freedom of this strongly coupled theory; iii) direct gauge mediation
of supersymmetry breaking occurs due to messenger superfields that are also
effective low energy degrees of freedom. We discuss the way to generalize this
approach to realistic models with three generations. These models might be
favorable from the point of view of string theory compactifications.


title: $K \to \pi \nu \bar \nu$: A Model Independent Analysis and Supersymmetry

abstract:
  We present a model independent analysis of new-physics contributions to the
decays K^+ \to \pi^+ \nu \bar \nu and K_L \to \pi^0 \nu \bar \nu. We
parameterize the effects of new physics in these decays by two parameters: r_K
and \theta_K, with r_K=1 and \theta_K=0 in the Standard Model (SM). We show how
these parameters can be extracted from future data. This analysis offers some
insight in a possible violation of a "golden relation" between K \to \pi \nu
\bar \nu decays and the CP asymmetry in B \to \psi K_S in the SM pointed out
some time ago. We illustrate these ideas by considering a general class of
supersymmetric models. We find that in the "constrained" MSSM, in which
\theta_K=0, the measurements of Br(K^+ \to \pi^+ \nu \bar \nu) and Br(K_L \to
\pi^0 \nu \bar \nu) directly determine the angle \beta. Moreover, the "golden
relation" remains unaffected. On the other hand, in general SUSY models with
unbroken R-parity the present experimental constraints still allow for
substantial deviations from r_K=1 and \theta_K=0. Typically 0.5 < r_K < 1.3 and
-25^0 < \theta_K < 25^0. Consequently, in these models the violation of the
"golden relation" is possible and values for Br(K^+ \to \pi^+ \nu \bar \nu) and
Br(K_L \to \pi^0 \nu \bar \nu) departing from the SM expectations by factors
2-3 cannot be excluded. Our conclusions differ in certain aspects from the ones
reached in previous analyses. In particular, we stress the possible importance
of left-right flavour-violating mass insertions that were not considered
before.


title:
|V_{ub}| and Perturbative QCD Effects in the $B\to\pi$ Transition Form
  Factor

abstract:
  We report on recent improvements for the $B\to\pi$ form factor. The updated
value of $|V_{ub}|$ is presented.


title: QCD Corrections to Associated Higgs Boson Production

abstract:
  We compute QCD corrections to the processes $e^+e^-\to t \bar t h^0$ and
$pp\to t \bar t h^0$ by treating the Higgs boson as a parton which radiates off
a heavy quark. This approximatiion is valid in the limits $M_h<<M_t$ and $M_h,
M_t<<\sqrt{s}$. The corrections increase the rate for $pp\to t \bar t h^0$ at
the LHC by a factor of 1.2 to 1.5 over the lowest order rate for an
intermediate mass Higgs boson, $M_h < 180 GeV$. The QCD corrections are small
for $e^+e^-\to t \bar t h^0$ at $\sqrt{s}=1 TeV$.


title: Clean CKM Information from Bd(t) -> D(*)+/- pi-/+

abstract:
  It has been known for many years that the Bd(t) -> D(*)+/- {pi-/+, rho-/+,
a1-/+} modes may involve observable CP violating effects. This note describes
how to determine cleanly the Cabibbo-Kobayashi-Maskawa (CKM) phase phi = -2
beta - gamma = -pi + alpha - beta, even in the presence of possible final state
interactions. A discrete ambiguity remains.


title: Search for SUSY at LHC: Precision Measurements

abstract:
  Methods to make precision measurements of SUSY masses and parameters at the
CERN Large Hadron Collider are described.


title: Model building in SUSY QCD

abstract:
  In N=1 Supersymmetric gauge theories, we can calculate non-perturbative
effects in the superpotential. It is interesting to apply this effect to the
phenomenology. We show two models here. One is the low energy supersymmetry
(SUSY) breaking scenario without messenger sector, and the second is the
composite model generating Yukawa interaction dynamically.


title: Non-Perturbative Structure of the Nucleon

abstract:
  While much attention has been focussed on the successes of perturbative QCD
in describing the $Q^2$-dependence of deep-inelastic structure functions, the
starting distributions themselves contain important, non-perturbative
information on the structure of the nucleon, which has been somewhat neglected.
We review some of the most important, recent discoveries resulting from studies
of deep-inelastic scattering. There are important connections between these
discoveries and low energy properties of the nucleon and wherever possible we
shall make these clear. In particular, we shall see that well known features of
QCD, such as dynamical symmetry breaking, are reflected in the properties of
the measured parton distributions.


title: New results in vector meson dominance and rho meson physics

abstract:
  Recent results by Benayoun et al. comparing the predictions of a range of
existing models based on the Vector Meson Dominance hypothesis are summarized
and discussed. These are compared with data on e+ e- -> pi+ pi- and e+ e- ->
mu+ mu- cross-sections and the phase and near-threshold behavior of the
timelike pion form factor, with the aim of determining which (if any) of these
models is capable of providing an accurate representation of the full range of
experimental data. We find that, of the models considered, only that proposed
by Bando et al. is able to consistently account for all information, provided
one allows its parameter "a" to vary from the usual value of 2 to 2.4. Our fit
with the Bando model gives a point-like coupling gamma pi+ pi- of magnitude
approximately -e/6, while the common formulation of VMD excludes such a term.
The resulting values for the rho mass and pi+ pi- and e+ e- partial widths as
well as the branching ratio for the decay omega -> pi+ pi- obtained within the
context of this model are consistent with previous results.


title:
Strong CP and Mu Problems in Theories with Gauge Mediated Supersymmetry
  Breaking

abstract:
  We provide a simple solution to the $\mu$ and strong CP problems in the
context of gauge mediated supersymmetry breaking. The generic appearance of R
symmetry in dynamical supersymmetry breaking is used to implement Peccei-Quinn
symmetry. Acceptable $\mu$ and $B$ terms as well as the large symmetry breaking
scale are induced in the presence of nonrenormalizable interactions.
Cosmological consequences of this scheme turn out to yield constraints on the
PQ symmetry breaking scale and the number of the messenger/heavy quarks.
Complexity in introducing non-R Peccei-Quinn symmetry is contrasted with the
case of R symmetry.


title: Radiative Corrections to Moller Scattering of Polarized Particles

abstract:
  Principal contributions to QED radiative effects for Moller scattering of
polarized particles are investigated both on the Born level and taking into
account radiative corrections (RC). Scattering on the case of longitudinal and
transversal polarized targets is also considered.
  In a general way the expressions for differential cross section and
polarization asymmetry (PA) have been defined, and respective graphics for
longitudinal and transversal polarization asymmetries and also for radiative
corrections to asymmetry are presented. All quantities are presented in terms
of covariant variables. The ultrarelativistic approximation was applied for
calculations. The results of a computer run are presented.


title: A modified BFKL equation with Q depedence

abstract:
  We propose a modified Balitsky-Fadin-Kuraev-Lipatov (BFKL) equation for the
summation of large $\ln(1/x)$, $x$ being the Bjorken variable, which contains
an extra dependence on momentum transfer $Q$ compared to the conventional BFKL
equation. This $Q$ dependence comes from the phase space constraint for soft
real gluon emissions in the derivation of the BFKL kernel. The modified
equation gives a slower rise of the gluon distribution function with $1/x$ for
smaller $Q$, such that the predictions for the structure functions
$F_{2,L}(x,Q^2)$ involved in deep inelastic scattering match the HERA data.
These results are similar to those obtained from the
Ciafaloni-Catani-Fiorani-Marchesini equation, which embodies both the $\ln Q$
and $\ln(1/x)$ summations. The reason that the conventional BFKL equation can
not be applied to the low $Q$ (soft pomeron dominant) region is supplied.


title: Three flavor implications of CHOOZ result

abstract:
  We analyze the recent result of the CHOOZ collaboration in the context of
mixing and oscillations between all the three neutrino flavors. If one assumes
a hierarchy among the vacuum mass eigenvalues (\delta_{21} \ll \delta_{31}),
then the CHOOZ result limits the (13) mixing angle \phi to quite small values.
This in turn limits the contribution of the \nu_e <--> \nu_\mu oscillation
channel to the atmospheric neutrino anomaly to less than 10 percent. It also
implies that the solution to the solar neutrino problem is effectively \nu_e
<--> \nu_\mu oscillation and that of the atmospheric neutrino problem is
effectively \nu_\mu <--> \nu_\tau.


title:
Numerical solution of Q^2 evolution equation for the transversity
  distribution Delta_T q

abstract:
  We investigate numerical solution of the Dokshitzer-Gribov-Lipatov-Altarelli-
Parisi (DGLAP) Q^2 evolution equation for the transversity distribution Delta_T
q or the structure function h_1. The leading-order (LO) and next-to-
leading-order (NLO) evolution equations are studied. The renormalization scheme
is MS or overline{MS} in the NLO case. Dividing the variables x and Q^2 into
small steps, we solve the integrodifferential equations by the Euler method in
the variable Q^2 and by the Simpson method in the variable x. Numerical results
indicate that accuracy is better than 1% in the region 10^{-5}<x<0.8 if more
than fifty Q^2 steps and more than five hundred x steps are taken. We provide a
FORTRAN program for the Q^2 evolution and devolution of the transversity
distribution Delta_T q or h_1. Using the program, we show the LO and NLO
evolution results of the valence-quark distribution Delta_T u_v + Delta_T d_v,
the singlet distribution sum_i (Delta_T q_i + Delta_T qbar_i), and the flavor
asymmetric distribution Delta_T ubar - Delta_T dbar.They are also compared with
the longitudinal evolution results.


title: Quantum Groups in Hadron Phenomenology

abstract:
  We show that application of quantum unitary groups, in place of ordinary
flavor SU(n_f), to such static aspects of hadron phenomenology as hadron masses
and mass formulas is indeed fruitful. The so-called q-deformed mass formulas
are given for octet baryons (1/2)^+ and decuplet baryons (3/2)^+, as well as
for the case of vector mesons 1^- involving heavy flavors. For deformation
parameter q, rigid fixation of values is used. New mass sum rules of remarkable
accuracy are presented. As shown in decuplet case, the approach accounts for
effects highly nonlinear in SU(3)-breaking. Topological implication (possible
connection with knots) for singlet vector mesons and the relation q <--->
\theta_C (Cabibbo angle) in case of baryons are considered.


title: Scalar Top Quark Production at $\mu^+ \mu^-$ Colliders

abstract:
  We discuss the production of stops at a $\mu^+ \mu^-$ collider. We present
numerical predictions for the cross sections within the Minimal Supersymmetric
Standard Model. In particular we consider stop production near $\sqrt{s} =
m_{H^0}$ and $\sqrt{s} = m_{A^0}$.


title:
Nonperturbative Flow Equations with Heat-Kernel Methods at finite
  Temperature

abstract:
  We derive nonperturbative flow equations within an effective constituent
quark model for two quark flavors. Heat-kernel methods are employed for a
renormalization group improved effective potential. We study the evolution of
the effective potential with respect to an infrared cutoff scale $k$ at
vanishing temperature. At the first stage we omit corrections coming from the
anomalous dimension. This investigation is extrapolated to finite temperature,
where we find a second order phase transition in the chiral limit at $T_c
\approx 130$ MeV. Due to a smooth decoupling of massive modes, we can directly
link the low-temperature four-dimensional theory to the three-dimensional
high-temperature theory and can determine universal critical exponents.


title: Optical Activity of a Neutrino Gas

abstract:
  For photons that propagate through a gas of neutrinos with a non-zero
chemical potential, the left-handed and right-handed polarization modes acquire
different dispersion relations. This is due to the CP and CPT-odd terms induced
by such a background on the photon self-energy. We present a detailed
calculation of this effect, which does not depend on any physical assumptions
beyond those of the standard electroweak model. Some possible cosmological and
astrophysical implications of our results are considered in several contexts,
including the recent discussions regarding the rotation of the plane of
polarization of electromagnetic waves over cosmological distances.


title: The ALLM parameterization of sigma_{tot}(gamma* p) - an update

abstract:
  The ALLM parameterization of sigma_{tot}(gamma* p) has been updated by using
all published F_2 data to determine its parameters. The fit yields a chi^2/ndf
of 0.97 for the 1356 data points. The updated ALLM parameterization, ALLM97,
gives a good description of all the available data in the whole x and Q^2 range
studied so far (3\times10^{-6} < x < 0.85, 0 \le Q^2 < 5000 GeV^2).


title: Inelasticity and intranuclear cascading in geometrical multichain model

abstract:
  The inelasticity in nucleus-nucleus collisions at high energies is calculated
in the framework of geometrical multichain model. The very fast increase of the
inelasticity is found as a result of a second-stage cascading process. The same
behaviour is expected for all the models using the wounded nucleon idea. The
simple formula for the number of wounded nucleons inside colliding nuclei does
not need to be exact.


title: Dispersive Bounds on the Shape of B -> D^(*) l nu Form Factors

abstract:
  Dispersive constraints on the shape of the form factors which describe the
exclusive decays B -> D^(*) l nu are derived by fully exploiting spin symmetry
in the ground-state doublet of heavy-light mesons. The analysis includes all
twenty B^(*) -> D^(*) semileptonic form factors. Heavy-quark symmetry, with
both short-distance and 1/m_Q corrections included, is used to provide
relations between the form factors near zero recoil. Simple one-parameter
functions are derived, which describe the form factors in the semileptonic
region with an accuracy of better than 2%. The implications of our results for
the determination of |V_cb| are discussed.


title: A simple method for multi-leg loop calculations 2: a general algorithm

abstract:
  The method introduced in a previous paper to simplify the tensorial reduction
in multi-leg loop calculations is extended to generic one-loop integrals, with
arbitrary internal masses and external momenta.


title:
Two-loop large Higgs mass corrections to electroweak gauge boson quartic
  couplings

abstract:
  The two-loop corrections to the electroweak gauge bosons quartic couplings
growing quadratically with the Higgs boson mass are calculated in the Standard
Model in the limit of large Higgs mass. The corrections to WWWW, WWZZ and ZZZZ
four-vertices are found to be an order of magnitude larger than the two-loop
m_H^2 corrections to light fermion and triple gauge boson vertices. For a heavy
Higgs boson with a mass around 1 TeV the corrections are at the several percent
level and in principle could be observed experimentally.


title:
First determination of the quark mixing matrix element Vtb independent
  of assumptions of unitarity

abstract:
  We present a new method for the determination of the
Cabibbo-Kobayashi-Maskawa quark mixing matrix element $|V_{tb}|$ from
electroweak loop corrections, in particular those affecting the process $Z\to
b\bar{b}$. From a combined analysis of results from the LEP, SLC, Tevatron, and
neutrino scattering experiments we determine $|V_{tb}| = 0.77^{+0.18}_{-0.24}$.
This is the first determination of $|V_{tb}|$ which is independent of unitarity
assumptions.


title:
First unitarity-independent determination of the CKM matrix elements
  $V_{td}$, $V_{ts}$, and ${V_{tb}$ and the implications for unitarity

abstract:
  The magnitudes of the CKM matrix elements $V_{td}$, $V_{ts}$, and $V_{tb}$
are determined for the first time without any assumptions of unitarity. The
implications for the unitarity of the CKM matrix as a whole are discussed.


title: The Mystery of Flavor

abstract:
  After outlining some of the issues surrounding the flavor problem, I present
three speculative ideas on the origin of families. In turn, families are
conjectured to arise from an underlying preon dynamics; from random dynamics at
very short distances; or as a result of compactification in higher-dimensional
theories. Examples and limitations of each of these speculative scenarios are
discussed. The twin roles that family symmetries and GUT's can have on the
spectrum of quarks and leptons is emphasized, along with the dominant role that
the top mass is likely to play in the dynamics of mass generation.


title: Field-induced axion decay $a \to e^+ e^-$ in KSVZ-model

abstract:
  The axion decay into electron-positron pair $a \to e^+ e^-$ is studied in an
external magnetic field in KSVZ-model where axions have only induced coupling
to leptons. The axion lifetime in the field decreases with energy and field
strength to seconds.


title:
Supersymmetric SO(10) with SU(2)_L X SU(2)_R X SU(4)_C Intermediate
  Gauge Symmetry

abstract:
  In recent analyses the existence of
$SU(2)_L\times\SU(2)_R\times\SU(4)_C(g_{2L}\ne g_{2R})$ intermediate gauge
symmetry has been ruled out in SUSY SO(10) model at one-loop level, although
the left-right symmetric intermediate gauge group has been shown to exist with
certain light scalar superfields near 1 TeV.We show,how the asymmetric gauge
group is allowed with an intermediate scale $M_I=10^10- 10^13$ GeV by including
two-loop and threshold effects.


title: Comments on compositeness in the SU(2) linear sigma model

abstract:
  First we summarize the quark-level linear $\sigma$ model compositeness
conditions and verify that indeed $m_\sigma = 2 m_q$ when $m_\pi = 0$ and
$N_c=3$, rather than in the $N_c\to\infty$ limit, as is sometimes suggested.
Later we show that this compositeness picture also predicts a chiral symmetry
restoration temperature $T_c = 2f_\pi$, where $f_\pi$ is the pion decay
constant. We contrast this self-consistent Z=0 compositeness analysis with
prior studies of the compositeness problem.


title: Flavor Changing Neutral Currents at mu^+mu^- Colliders

abstract:
  We illustrate the possibility of observing signals from Flavor Changing
Neutral Currents, originating from the scalar sector of a Two Higgs Doublet
Model. In particular, we focus on the tree level process mu^+ mu^- --> tbar c +
cbar t, via scalar exchange in the s-channel, as a distinctive process for mu^+
mu^- colliders.


title: Flavor and CP violations from sleptons at the muon collider

abstract:
  Supersymmetric theories generally have new flavor and CP violation sources in
the squark and slepton mass matrices. They will contribute to the lepton flavor
violation processes, such as $\mu \to e \gamma$, which can be probed far below
the current bound with an intense muon source at the front end of the muon
collider. In addition, if sleptons can be produced at the muon collider, the
flavor violation can occur at their production and decay, allowing us to probe
the flavor mixing structure directly. Asymmetry between numbers of $\mu^+ e^-$
and $e^+ \mu^-$ events will be a sign for CP violation in supersymmetric flavor
mixing.


title:
Precision Measurements at The Higgs Resonance: A Probe of Radiative
  Fermion Masses

abstract:
  The possibility of radiative generation of fermion masses from soft
supersymmetry breaking chiral flavor violation is explored. Consistent models
are identified and classified. Phenomenological implications for electric
dipole moments and magnetic moments, as well as collider probes -- in
particular those relevant at the Higgs resonance -- are discussed. It is shown
that partial widths $\Gamma_{h^{0} \to ff}$ are enhanced compared with the
minimal supersymmetric standard model.


title:
Time evolution of correlation functions in Non-equilibrium Field
  Theories

abstract:
  We investigate the non-equilibrium properties of an N-component scalar field
theory. The time evolution of the correlation functions for an arbitrary
ensemble of initial conditions is described by an exact functional differential
equation. In leading order in the 1/N expansion the system can be understood in
terms of infinitely many conserved quantities. They forbid the approach to the
canonical thermal distribution. Beyond leading order only energy conservation
is apparent generically. Nevertheless, we find a large manifold of stationary
distributions both for classical and quantum fields. They are the fixed points
of the evolution equation. For small deviations of the correlation functions
from a large range of fixed points we observe stable oscillations. These
results raise the question of if and in what sense the particular fixed point
corresponding to thermal equilibrium dominates the large time behavior of the
system.


title: On Some rare weak decays of vector mesons

abstract:
  Some semileptonic weak decays of vector mesons are considered in the
framework of the most popular quark models. The predicted branching ratios are
unfortunately too small to make a study of these decays realistic at meson
factories under construction.


title: Chiral Phase Transition and Baryon Number Conservation

abstract:
  In the standard $R^4$ embedding of the chiral O(4) model in 3+1 dimensions
the winding number is not conserved near the chiral phase transition and thus
no longer can be identified with baryon number. In order to reestablish
conserved baryon number in effective low-energy models near and above the
critical temperature $T_c$ it is argued that insisting in O(N) models on the
angular nature of the chiral fields with fixed boundary conditions restores
conservation of winding number. For N=2 in 1+1 dimensions it is illustrated
that as a consequence of the angular boundary conditions nontrivial solutions
exist which would be unstable in $R^2$; moving trajectories avoid crossing the
origin; and time evolution of random configurations after a quench leads to
quasistable soliton-antisoliton ensembles with net winding number fixed.


title: Quark Mass Matrices in Superstring Models

abstract:
  Four simple but realistic patterns of quark mass matrices are derived from
orbifold models of superstring theory in the absence of gauge symmetries. Two
of them correspond to the Ramond-Roberts-Ross types, which have five texture
zeros in up and down quark sectors. The other two, with four texture zeros,
preserve the structural parallelism between up and down sectors. The
phenomenological consequences of these mass matrices on flavor mixings and CP
violation are analyzed at the weak scale. With the same input values of quark
mass ratios, we find that only one or two of the four patterns can be in good
agreement with current experimental data.


title: Measuring Trilinear Gauge Boson Couplings at Hadron and Lepton Colliders

abstract:
  We discuss the measurement of the $WWV$ ($V=\gamma,\, Z$) gauge boson
couplings in present and future collider experiments. The major goals of such
experiments will be the confirmation of the Standard Model (SM) predictions and
the search for signals of new physics. The present limits on these couplings
from Tevatron and LEP2 experiments as well as the expectations from future
hadron and lepton collider experiments are summarized. We also study the impact
of initial state radiation on the sensitivity limits which can be achieved at
the NLC and a $\mu^+\mu^-$ collider.


title: Disoriented Chiral Condensate: Theory and Phenomenology

abstract:
  The basic ideas underlying the production dynamics and search techniques for
disoriented chiral condensate are described.


title: Study of the Z Boson at LEP

abstract:
  The Z line shape is measured at LEP with an accuracy at the per mille level.
Usually it is described in the Standard Model of electroweak interactions with
account of quantum corrections. Alternatively, one may attempt different
model-independent approaches in order to extract quantities like mass and width
of the Z boson. If a fit deviates from that in the standard approach, this may
give hints for New Physics contributions. I describe two model-independent
approaches and compare their applications to LEP data with the Standard Model
approach.