title: CP Violation and Rare Decays of K and B Mesons

abstract:
  These lectures describe CP violation and rare decays of K and B mesons and
consist of ten chapters: i) Grand view of the field including CKM matrix and
the unitarity triangle, ii) General aspects of the theoretical framework, iii)
Particle-antiparticle mixing and CP violation, iv) Standard analysis of the
unitarity triangle, v) The ratio epsilon'/epsilon including most recent
developments, vi) Rare decays K^+ -> pi^+ nu barnu and K_L -> pi^0 nu barnu,
vii) Express review of other rare decays, viii) Express review of CP violation
in B decays, ix) A brief look beyond the Standard Model including connections
between epsilon'/epsilon and CP violating rare K decays, x) Final messages.


title: Instantons and $\eta$ Meson Production near threshold in NN collisions

abstract:
  An enhancement for the $\eta$ production in proton-neutron collisions as
compared with that in proton-proton scattering has been recently observed. We
present a calculation for the production cross section, in proton-neutron
collisions near threshold, within instanton model for the QCD vacuum and show
that a specific flavor dependent nonperturbative quark-gluon interaction
related to instantons is able to explain the observed enhancement.


title:
Effective theory for the soft fluctuation modes in the spontaneously
  broken phase of the N-component scalar field theory

abstract:
  The effective dynamics of the low-frequency modes is derived for the O(N)
symmetric scalar field theory in the broken symmetry phase. The effect of the
high-frequency fluctuations is taken into account at one-loop level exactly. A
new length scale is shown to govern the long-time asymptotics of the linear
response function of the Goldstone modes. The large time asymptotic decay of an
arbitrary fluctuation is determined in the linear regime. We propose a set of
local equations for the numerical solution of the effective non-linear
dynamics. The applicability of the usual gradient expansion is carefully
assessed.


title: A simple scheme for masses and mixings of quarks and neutrinos

abstract:
  The mass matrices of charged fermions have a simple structure if expressed in
powers of the small parameter sigma=(m_c/m_t)^{1/2}. It is suggested that the
mass matrix of the three heavy neutrinos occuring in grand unified theories can
be expressed in terms of the same parameter. The requirement that these heavy
neutrinos carry different U(1) generation quantum numbers gives rise to an
almost unique form for this matrix. By applying the see-saw mechanism, the mass
splitting of the two lightest neutrinos comes out to be tiny, favoring the
vacuum oscillation solution for solar neutrinos. The mixing matrix is of the
bimaximal type but contains also CP violating phases.


title:
Mixing Effects in the Finite-Temperature Effective Potential of the MSSM
  with a Light Stop

abstract:
  We incorporate the effects of mixing arising from the trilinear terms in the
MSSM potential to the effective three dimensional theory for the MSSM at high
temperature in the limit of large $m_{A}$. There are relevant one-loop effects
that modify the 3D parameters of the effective theory.
  We calculate the two-loop effective potential of the 3D theory for the Higgs
and the right handed stop to analyse the possible phase transitions and to
determine the precise region in the $m_{h}$-$m_{\tilde{t}_{2}}$ plane for which
the sphaleron constraint for preservation of the baryon asymmetry is satisfied.
There is an upper bound on the value of the mixing parameter coming from stop
searches. We also compare with previous results obtained using 4D calculations
of the effective potential for the regime of large $m_{Q}$. A two-stage phase
transition persists for a small range of values of $m_{\tilde{t}_{2}}$ for
given values of the mixing parameter and $\tan\beta$. This can further
constrain the allowed region of parameter space. Electroweak baryogenesis
requires a value of $m_{\tilde{t}_{2}}\lsi 170$ and $m_{h} \lsi 105$ GeV for
$m_{Q}=300$ GeV.


title:
Considerations Concerning the Radiative Corrections to Muon Decay in the
  Fermi and Standard Theories

abstract:
  The FAC, PMS, and BLM optimization methods are applied to the QED corrections
to the muon lifetime in the Fermi V-A theory. The FAC and PMS scales are close
to m_e, while the BLM scale nearly concides with the geometric average
\sqrt{m_e m_\mu}. The optimized expressions are employed to estimate the third
order coefficient in the \alpha(m_\mu) expansion and the theoretical error of
the perturbative series. Using arguments based on effective field theory and a
simple examination of Feynman diagrams, it is shown that, if contributions of
O(\alpha m_\mu^2/M_W^2) are neglected, the corrections to muon decay in the SM
factorize into the QED correction of the Fermi V-A theory and the electroweak
amplitude g^2/(1-\Delta r), both of which are strictly scale-independent. We
use the results to clarify how the QED corrections to muon decay and the Fermi
constant G_F should be used in the SM, and what is the natural choice of scales
if running couplings are employed.


title:
Charged Higgs- and R-Parity-Violating Slepton-Strahlung at Hadron
  Colliders

abstract:
  It is shown that the radiation of a charged Higgs boson off a
third-generation quark (charged-Higgs-strahlung) provides an important channel
for the discovery of the charged Higgs at hadron colliders. Equivalently, in
supersymmetric models with explicit lepton-number (R-parity) violation,
sleptons may also be produced in association with quarks (slepton-strahlung).
Higgs- and slepton-strahlung production cross sections are given for both the
Tevatron and the LHC. The LHC cross sections imply that heavy ${\cal{O}}$(TeV)
charged Higgs bosons can be produced via charged-Higgs-strahlung and that
strahlung production of charged sleptons is possible even for small R-parity
violating couplings. The possible discovery of sleptons through this channel
offers a surprising handle on models of neutrino masses.


title:
Interpreting virtual photon interactions in terms of parton distribution
  functions

abstract:
  Interactions of virtual photons are analyzed in terms of photon structure. It
is argued that the concept of parton distribution functions is
phenomenologically very useful even for highly virtual photons involved in hard
collisions. The role of longitudinal photons for proper interpretation of jet
cross--sections in the region of moderate virtualities accessible at HERA is
investigated.


title: Masses and mixing angles and going beyond the Standard Model

abstract:
  The idea, following Michel and O'Raifeartaigh, of assigning meaning to the
(gauge) \underline{group} and not only the Lie algebra for a Yang Mills theory
is reviewed. Hints from the group and the fermion spectrum of the Standard
Model are used to suggest the putting forward of our AGUT-model, which gives a
very good fit to the orders of magnitudes of the quark and lepton masses and
the mixing angles including the CP-breaking phase. But for neutrino
oscillations modifications of the model are needed. Baryogenesis is not in
conflict with the model.


title:
Implications of a New Solar System Population of Neutralinos on Indirect
  Detection Rates

abstract:
  Recently, a new Solar System population of weakly interacting massive
particle (WIMP) dark matter has been proposed to exist. We investigate the
implications of this population on indirect signals in neutrino telescopes (due
to WIMP annihilations in the Earth) for the case when the WIMP is the lightest
neutralino of the MSSM, the minimal supersymmetric extension of the standard
model. The velocity distribution and capture rate of this new population is
evaluated and the flux of neutrino-induced muons from the center of the Earth
in neutrino telescopes is calculated. The strength of the signal is very
sensitive to the velocity distribution of the new population. We analytically
estimate this distribution using the approximate conservation of the component
of the WIMP angular momentum orthogonal to the ecliptic plane. The non-linear
problem of combining a fixed capture rate from the standard galactic WIMP
population with one rising linearly with time from the new population to obtain
the present-day annihilation rate in the Earth is also solved analytically. We
show that the effects of the new population can be crucial for masses below
around 150 GeV, where enhancements of the predicted muon flux from the center
of the Earth by up to a factor of 100 compared to previously published
estimates occur. As a result of the new WIMP population, the next generation of
neutrino telescopes should be able to probe a much larger region of parameter
space in the mass range 60-130 GeV.


title: Dilepton Production at Fermilab and RHIC

abstract:
  Some recent results from several fixed-target dimuon production experiments
at Fermilab are presented. In particular, we discuss the use of Drell-Yan data
to determine the flavor structure of the nucleon sea, as well as to deduce the
energy-loss of partons traversing nuclear medium. Future dilepton experiments
at RHIC could shed more light on the flavor asymmetry and possible
charge-symmetry-violation of the nucleon sea. Clear evidence for scaling
violation in the Drell-Yan process could also be revealed at RHIC.


title: On finite-density QCD at large Nc

abstract:
  Deryagin, Grigoriev, and Rubakov (DGR) have shown that in finite-density QCD
at infinite Nc the Fermi surface is unstable with respect to the formation of
chiral waves with wavenumber twice the Fermi momentum, while the BCS
instability is suppressed. We show here that at large, but finite Nc, the DGR
instability only occurs in a finite window of chemical potentials from above
Lambda_QCD to mu_critical = exp(gamma ln^2 Nc + O(ln Nc ln ln Nc))Lambda_QCD,
where gamma = 0.02173. Our analysis shows that, at least in the perturbative
regime, the instability occurs only at extremely large Nc, Nc > 1000 Nf, where
Nf is the number of flavors. We conclude that the DGR instability is not likely
to occur in QCD with three colors, where the ground state is expected to be a
color superconductor. We speculate on possible structure of the ground state of
finite-density QCD with very large Nc.


title: Leading nucleon and the proton-nucleus inelasticity

abstract:
  We present in this paper a calculation of the average proton-nucleus
inelasticity. Using an Iterative Leading Particle Model and the Glauber model,
we relate the leading particle distribution in nucleon-nucleus interactions
with the respective one in nucleon- proton collisions. To describe the leading
particle distribution in nucleon-proton collisions, we use the Regge Mueller
formalism.
  Contribution to 26th ICRC - Salt Lake City, Utah. August, 1999.
  HE 1.1.14


title: Degenerate or Hierarchical Neutrinos in Supersymmetric Inflation

abstract:
  Two moderate extensions of the minimal supersymmetric standard model are
considered. The first one includes a U(1)_{B-L} gauge group, while the second
is based on a left-right symmetric gauge group. In these models, hybrid
inflation is `naturally' realized and the mu problem is solved via a
Peccei-Quinn symmetry. Baryon number conservation is an automatic consequence
of a R-symmetry. The baryon asymmetry of the universe is generated through a
primordial leptogenesis. In the `B-L' case, neutrinos are assumed to acquire
degenerate masses equal to about 1.5 eV by coupling to SU(2)_L triplet
superfields, thereby providing the hot dark matter of the universe. In the
`left-right' model, light neutrinos acquire hierarchical masses by the seesaw
mechanism. They are taken from the small angle MSW resolution of the solar
neutrino puzzle and the SuperKamiokande data. Maximal nu_{mu}-nu_{tau} mixing,
implied by the same data, is easily accommodated. The gravitino and
baryogenesis constraints can be satisfied, in both models, with more or less
`natural' values of the relevant coupling constants.


title: The production of light Goldstone particles on photon colliders

abstract:
  It is shown that by realizing the project of intensive $\gamma $ beams with
large energy (project PLC) an essential flux of light Goldstone particles
(axions, arions, familons, majorons) will be generated. The light higgs can be
observed via interaction with matter. The probability of light higgs - electron
production by absorption of several laser photons simultaneously is calculated.


title: Global Positioning of Spin GPS Scheme for Half-Spin Massive Spinors

abstract:
  We present a simple and flexible method of keeping track of the complex
phases and spin quantization axes for half-spin initial- and final-state Weyl
spinors in scattering amplitudes of Standard Model high energy physics
processes. Both cases of massless and massive spinors are discussed. The method
is demonstrated and checked numerically for spin correlations in tau tau-bar
production and decay. Its main application will be in the forthcoming work of
combining effects due to multiple photon emission (exponentiation) and spin,
embodied in the Monte Carlo event generators for production and decay of
unstable fermions such as the tau lepton, t-quark and hypothetical new heavy
particles.


title:
Coherent Exclusive Exponentiation CEEX: the Case of the Resonant e+ e-
  Collision

abstract:
  We present the first-order coherent exclusive exponentiation (CEEX) scheme,
with the full control over spin polarization for all fermions. In particular it
is applicable to difficult case of narrow resonances. The resulting spin
amplitudes and the differential distributions are given in a form ready for
their implementation in the Monte Carlo event generator. The initial-final
state interferences are under control. The way is open to the use of the exact
amplitudes for two and more hard photons, using Weyl-spinor techniques, without
giving up the advantages of the exclusive exponentiation, of the
Yennie-Frautschi-Suura type.


title: Superluminal Particles in Cosmic-Ray Physics

abstract:
  Present low-energy bounds on Lorentz symmetry violation do not allow to
exclude the possible existence of superluminal particles (superbradyons) with
critical speed in vacuum $c_i \gg c$ (c = speed of light) whose kinematical
properties would be close to of "ordinary" particles (bradyons) apart from the
difference in critical speed. If they exist, superbradyons may be the basic
building blocks of vacuum and and matter at Planck scale, provide most of the
matter in the Universe and be natural dark matter candidates. We present an
updated discussion of their theoretical and experimental properties, especially
as cosmic ray primaries or sources, as well as problems related to their
possible direct detection.


title: Flux tube dynamics in the dual superconductor

abstract:
  We study plasma oscillations in a flux tube of the dual superconductor model
of 't Hooft and Mandelstam. A magnetic condensate is coupled to an
electromagnetic field by its dual vector potential, and fixed electric charges
set up a flux tube. An electrically charged fluid (a quark plasma) flows in the
tube and screens the fixed charges via plasma oscillations. We investigate both
Type I and Type II superconductors, with plasma frequencies both above and
below the threshold for radiation into the Higgs vacuum. We find strong
radiation of electric flux into the superconductor in all regimes, and argue
that this invalidates the use of the simplest dual superconductor model for
dynamical problems.


title: Non-linear Regge spectrum fits to experimentally up-dated meson states

abstract:
  The exciting feature of recent times is the inflow of new experimental data.
Fits to the $\pi, \r$ and f meson resonances found by the VES collaboration,
along with those of the PDG 1998 compilation are reported using a non-linear
model for Regge trajectories. There are only five parameters including the pion
mass and the states come out as Regge -type excitations of the pion. Total
number of mesons fitted are 23 and the fit is good to $\sim$ 3% for 18 of them
and $\sim$ 9% for others.


title:
Limiting temperature of hadrons using states predicted from
  kappa-deformed Poincar\'e algebra

abstract:
  The experimental hadronic density of states dN/dm, assumed to be a sum of
normalized Breit- Wigner distributions and plotted as a function of the hadron
mass m, fails to show a Hagedorn like growth beyond 2 GeV, probably due to a
lack of data. Experimental hadronic states are fitted using $\ka$ -deformed
Poincar\'e algebra and the fit is used to extrapolate for including states not
detected. For the theoretical density of states the plot is a straight line in
the log scale even beyond 2 GeV with a limiting temperature of 400 MeV.


title: Global Analysis of Solar Neutrino Data

abstract:
  The data from all solar neutrino experiments presented at the Neutrino 98
conference has been analyzed and a brief summary of the status of the two most
popular neutrino solutions of the solar neutrino problem, the MSW mechanism and
vacuum oscillations, is presented here. The inclusion of the recoil-electron
data and of the zenith angle distribution of events in the SuperKamiokande
detector, together with the routine analysis of the rates, into a global
$\chi^2$ fit impose stringent constraints on these neutrino oscillation
scenarios.


title: Lepton flavor violation in a supersymmetric E_6 type model

abstract:
  This paper has been replaced as hep-ph/0003063 titled `Lepton flavor
violation in the supersymmetric standard model with vectorlike leptons'.


title: Macroscopic parity violating effects and 3He-A

abstract:
  We discuss parity violating effects in relativistic quantum theory and their
analogues in effective field theory of superfluid 3He-A. A mixed
axial-gravitational Chern-Simons term in the relativistic effective action and
its condensed matter analog are responsible for the chiral fermion flux along
the rotation axis of the heat bath in relativistic system and for the unusual
Omega-odd dependence of the zero-temperature density of the normal component on
the rotation velocity in 3He-A.


title:
Maximal $\nu_e \to \nu_s$ solution to the solar neutrino problem:
  just-so, MSW or energy independent?

abstract:
  We examine the maximal $\nu_e \to \nu_s$ solution to the solar neutrino
problem. This solution can be motivated by the exact parity model and other
theories. The $\nu_e$ survival probability exhibits one of three qualitatively
different behaviours depending on the value of $\Delta m^2$, viz. approximately
energy independent, just-so or MSW. By the last of these we mean an enhanced
night-time event rate due to regeneration in the Earth. We study all of these
possibilities in the context of the recent SuperKamiokande data.


title: Effective photon spectra for Photon Colliders

abstract:
  The luminosity distribution in the effective $\gamma\gamma$ mass at photon
collider has usually two peaks which are well separated: high energy peak with
mean energy spread 5-7% and wide low energy peak.The low energy peak depends
strongly on details of design it is unsuitablefor the study of New Physics
phenomena. We find simple approximte form of spectra of collided photons for
$\gamma\gamma$ and $e\gamma$ colliders wich convolution describes high energy
luminosity peak with good accuracy in the most essential preferable region of
parameters.


title: $B\to X_s\tau^+\tau^-$ in a CP softly broken two Higgs doublet model

abstract:
  The differential branching ratio, forward-backward asymmetry, CP asymmetry
and lepton polarization for a B-meson to decay to strange hadronic final states
and a $\tau^+\tau^-$ pair in a CP softly broken two Higgs doublet model are
computed. It is shown that contributions of neutral Higgs bosons to the decay
are quite significant when $\tan\beta$ is large. And it is proposed to measure
the direct CP asymmetry in back-forward asymmetry.


title:
Seesaw-constrained MSSM, Solution to the SUSY CP Problem and a
  Supersymmetric Explanation of $\epsilon'/\epsilon$

abstract:
  We analyze CP violation in the supersymmetric standard model (MSSM) embedded
minimally into a left-right symmetric gauge structure with the seesaw mechanism
for neutrino masses. With the plausible assumption of universal scalar masses
it is shown that CP violation in the hadron sector of the MSSM is described by
a single phase residing in the supersymmetry breaking Lagrangian. This improves
the CP properties of the MSSM by providing a natural solution to the SUSY CP
problem. Furthermore, $\epsilon'/\epsilon$ vanishes in this model above the
seesaw scale; extrapolation to the weak scale then leads to a prediction in
agreement with the NA31 and the recent KTeV observations. The electric dipole
moment of the neutron is naturally suppressed, we estimate its magnitude to be
about $4 \times 10^{-29}$ ecm. Additional predictions include a tightly
constrained super particle spectrum and vanishingly small CP asymmetries in the
$B$ meson system.


title:
Chiral Symmetry Breaking and Color Superconductivity in the Instanton
  Picture

abstract:
  The instanton approach to spontaneous chiral symmetry breaking is reviewed,
with emphasis on the connection to chiral random matrix theory. We extend the
approach to discuss the finite density, zero-temperature behaviour of quark
matter. Since the instanton-induced interactions are attractive in both
$\bar{q}q$ and $qq$ channels, a competition ensues between phases of matter
with condensation in either or both. It results in chiral symmetry restoration
due to the onset of diquark condensation, a `colour superconductor', at finite
density.


title: Gauge mechanism of mediation of supersymmetry breaking

abstract:
  Most phenomenologically acceptable supersymmetric models imply breaking of
supersymmetry in a separate sector of fields introduced just for this purpose.
Supersymmetry breaking is transferred to the Standard Model due to a certain
interaction with this additional sector. In this review we disuss one of the
popular mechanisms of such mediation with the key role played by the Standard
Model gauge interactions. We consider general principles of gauge mediation and
give the critical analysis of specific models together with their
phenomenological and cosmological implications. We present also basic facts
concerning mechanisms of dynamical supersymmetry breaking.


title: Cosmological Moduli Problem and Thermal Inflation Models

abstract:
  In superstring theories, there exist various dilaton and modulus fields which
masses are expected to be of the order of the gravitino mass $m_{3/2}$. These
fields lead to serious cosmological difficulties, so called ``cosmological
moduli problem'', because a large number of moduli particles are produced as
the coherent oscillations after the primordial inflation. We make a
comprehensive study whether the thermal inflation can solve the cosmological
moduli problem in the whole modulus mass region $m_\phi \sim 10 eV - 10^4 GeV$
predicted by both hidden sector supersymmetry (SUSY) breaking and
gauge-mediated SUSY breaking models. In particular, we take into account the
primordial inflation model whose reheating temperature is so low that its
reheating process finishes after the thermal inflation ends. We find that the
above mass region $m_\phi (\simeq m_{3/2}) \sim 10 eV - 10^4 GeV$ survives from
various cosmological constraints in the presence of the thermal inflation.


title: Tevatron Potential for Technicolor Search with Prompt Photons

abstract:
  We perform a detailed study of the process of single color octet isoscalar
$\eta_T$ production at the Tevatron with $\eta_T \to \gamma + g$ decay
signature, including a complete simulation of signal and background processes.
We determined a set of optimal cuts from an analysis of the various kinematical
distributions for the signal and backgrounds. As a result we show the exclusion
and discovery limits on the $\eta_T$ mass which could be established at the
Tevatron for some technicolor models.


title: W Boson Production at NLO

abstract:
  We discuss W boson production at HERA including NLO QCD corrections. A
detailed comparison with previous work is presented.


title: Bi-maximal Neutrino Mixing With SO(3) Flavour Symmetry

abstract:
  We demonstrate that an $SU(2)_L\times U(1)_Y$ model with extended Higgs
sector gives rise to bi-maximal neutrino mixing through the incorporation of
SO(3) flavour symmetry and discrete symmetry. The neutrino and the charged
lepton masses are generated due to higher dimensional terms. The hierarchical
structures of neutrinos and charged leptons are obtained due to inclusion of
SO(3) flavour symmetry and discrete symmetry.The model can accommodate the
vacuum oscillation solution of solar neutrino problem, through reasonable
choice of model parameters along with the atmospheric neutrino experimental
result.


title: A consistent approach to bubble-nucleation theory

abstract:
  We summarize recent work on the consistent calculation of bubble-nucleation
rates. Our approach is based on the notion of a real coarse-grained potential.
The bubble-nucleation rate is calculated through an expansion around the
semiclassical saddle point associated with tunnelling. We resolve outstanding
problems related to the convexity of the potential, the double-counting of the
effect of fluctuations and the inherent ultraviolet divergences. We determine
the region of validity of the expansion around the saddle point. We find that
this expansion fails near the spinodal line, and for weak or
radiatively-induced first-order phase transitions. We apply our method to the
bound on the Higgs-boson mass from vacuum metastability and the electroweak
phase transition.


title: Two-loop heavy top corrections to the Z boson partial widths

abstract:
  We present the evaluation of the two-loop O(g^4 mt^2) effects in the partial
widths of the Z boson in the MSbar scheme and in two different implementations
of the on-shell scheme. We observe a clear reduction of the scheme dependence
of the predictions. The renormalization procedure and the Heavy Top Expansion
employed in the O(g^4 mt^2) calculations are illustrated in some detail and
intermediate results are provided. We discuss the implication of our results on
the constraints for the Higgs mass making use of simple interpolating formulas.
We find that precision data give mh < 285 GeV at 95% C.L. taking into account
the theory uncertainty. Including also the information from direct search
experiments we obtain a 95% upper bound mh < 345 GeV.


title: Skyrmions and Bags in the 2D-O(3) model

abstract:
  Localized static solutions of the 2D-O(3) model are investigated in a
representation with the 3-vector field $\vec Phi$ split into the unit vector
$\hat Phi$ and the modulus $\Phi$. As in the nonlinear version of the model
this allows for the definition of a topological winding number $B$, and for the
separation of the complete configuration space into distinct $B$-sectors. For
small values of the $\Phi^4$-coupling strength the stable energy minima in
these sectors are characterized by bag formation in the modulus field which in
the standard cartesian representation of the linear O(3) model would be
unstable towards decay into the trivial B=0 vacuum. Stabilized by
$B$-conservation they exhibit a surprising variety of very appealing features
for multiply charged systems. With the total charge bound into one common deep
bag opposite ways of distributing the topological charge density inside the bag
can be realized: Pointlike structures which retain the individuality of single
constituents (or doubly charged pairs), or a deconfined charge density spread
uniformly throughout the interior of the bag. It is suggested that this
extension supplies a crucial link to overcome the unsatisfactory existing
mismatch between multiskyrmion configurations and nuclear structure.


title: Astrophysical Constraints on Large Extra Dimensions

abstract:
  In the Kaluza-Klein (KK) scenario with n large extra dimensions where gravity
propagates in the 4+n dimensional bulk of spacetime while gauge and matter
fields are confined to a four dimensional subspace, the light graviton KK modes
can be produced in the Sun, red giants and supernovae. We study the energy-loss
rates through photon-photon annihilation, electron-positron annihilation,
gravi-Compton-Primakoff scattering, gravi-bremsstrahlung and nucleon-nucleon
bremsstrahlung, and derive lower limits to the string scale M_S. The most
stringent lower limit obtained from SN1987A leads to $M_S> 30 - 130$ TeV
(2.1-9.2 TeV) for the case of two (three) large extra dimensions.


title:
Tau-neutrino Appearance Searches using Neutrino Beams from Muon Storage
  Rings

abstract:
  We study the possibilities offered by muon storage rings for tau-neutrino
appearance experiments due to nu_mu to nu_tau and nu_e to nu_tau oscillations.
Tau event rates for such experiments are first discussed with a view to
examining their variation prior to the inclusion of experimental cuts, in order
to better understand how baselines, beam energies, forward peaking of decay
neutrinos with increasing energies and average fluxes intercepted by detectors
of various sizes can affect their optimization. Subsequently, event rates
implementing cuts are computed for hadronic and wrong-sign lepton decay modes
and used to plot 90% C.L. contours for the parameters that can be explored in
such experiments. The expected scaling of the contours with energy and baseline
is discussed. The results show that even for modest muon beam energies,
convincing coverage of the Super Kamiokande parameters is possible. In
addition, very significant enlargement of present-day bounds on the mass and
mixing parameters of all types of neutrino oscillations is guaranteed by such
searches.


title: Breakthroughs on the Dark Matter Issue

abstract:
  Last year observations had a profound impact on our views on the amount and
nature of dark matter in the universe. We give a brief review of the recent
history of dark matter models beyond the pure cold dark matter universe. In
view of the most recent cosmological data, we then go on to discuss models with
a positive cosmological constant. Finally we explicitly analyse a class of
particle physics models for a dynamical cosmological component with negative
pressure (``quintessence''), in the context of supersymmetric theories.


title:
Energy dependence of mean multiplicities in gluon and quark jets at the
  next-to-next-to-next-to-leading order

abstract:
  Analytic predictions for the energy dependence of the mean multiplicities in
gluon and quark jets are presented at the next-to-next-to-next-to-leading order
(3NLO) of perturbative QCD and are compared to experiment. The 3NLO correction
to the gluon jet multiplicity is found to be small. The corresponding
theoretical expression provides a good description of available gluon jet
measurements. In contrast, the 3NLO correction to the quark jet multiplicity is
large and the theoretical expression does not describe the data accurately. It
is shown that the well known success of the next-to-leading order (NLO)
approximation in describing the energy evolution of quark jet multiplicity can
be attributed to the equivalence of the quark and gluon expressions at NLO to
within a constant factor, and to almost constant contributions from higher
order terms to the gluon jet result.


title: The Z -> bb decay asymmetry and flavor changing neutral currents

abstract:
  The measured value of A_b, the Z \bar bb asymmetry parameter, disagrees with
the Standard Model at 99% confidence level. If genuine the discrepancy could
indicate new interactions unique to third generation quarks, implying enhanced
Z penguin amplitudes. Enhanced rates are predicted for rare K and B decays,
such as K^{+} --> pi^{+}\bar nu nu, K_{L} --> pi^{0}\bar nu nu, B --> X_{s}\bar
nu nu, and B_{s} --> \bar mu mu. Measurements of epsilon^{\prime}/epsilon then
imply QCD penguin amplitudes must also be similarly enhanced. The Higgs sector
of an SU(2)_L x SU(2)_R gauge theory has some of the features needed to explain
these phenomena and would also imply right-handed penguin amplitudes.


title: Pomeron and Reggeized Glueball/Sigma

abstract:
  It has long been believed that the Pomeron, which has been successful in
phenomenological fits to high energy scattering data, is associated with
gluonic exchange. By determining the Regge-nucleon vertex in terms of
previously determined glueball-quark coupling we show that the Pomeron might be
related to the Regge trajectory defined by a light scalar glueball/sigma system
and a tensor glueball, which involves complicated nonperturbative QCD. We
predict a tensor glueball at 2.8 GeV.


title: NNLO results for heavy quark and direct photon production near threshold

abstract:
  I present some results for the next-to-next-to-leading order expansions of
the resummed cross sections for heavy quark and direct photon production near
threshold in hadronic collisions.


title:
Calculations of Neutralino-Stau Coannihilation Channels and the
  Cosmologically Relevant Region of MSSM Parameter Space

abstract:
  Assuming that the lightest supersymmetric particle (LSP) is the lightest
neutralino, we present a detailed exploration of neutralino-stau coannihilation
channels, including analytical expressions and numerical results. We also
include neutralino coannihilations with the selectron and smuon. We evaluate
the implications of coannihilations for the cosmological relic density of the
LSP, which is assumed to be stable, in the constrained minimal supersymmetric
extension of the Standard Model (CMSSM), in which the soft
supersymmetry-breaking parameters are universal at the supergravity GUT scale.
We evaluate the changes due to coannihilations in the region of the MSSM
parameter space that is consistent with the cosmological upper limit on the
relic LSP density. In particular, we find that the upper limit on the mass of
the neutralino is increased from about 200 GeV to about 600 GeV in the CMSSM,
and estimate a qualitatively similar increase for gauginos in the general MSSM.


title:
End-point of the Electroweak Phase Transition using the auxiliary mass
  method

abstract:
  We study the end-point of the Electroweak phase transition using the
auxiliary mass method. The end point is $m_H\sim40$ (GeV) in the case $m_t=0$
(GeV) and strongly depends on the top quark mass. A first order phase
transition disappears at $m_t\sim 160$ (GeV). The renormalization effect of the
top quark is significant.


title: Neutrino Propagation Through Fluctuating Media

abstract:
  The description of neutrino propagation through a fluctuating medium is
summarized. Fluctuation-Dissipation-Theorem arguments relate microscopic
fluctuations to thermodynamic quantities, allowing these to be very generally
studied in astrophysical environments.
  Fluctuation-induced modifications to neutrino oscillations have been studied
in detail within the Sun and within the envelope of supernovae, and although
surprisingly large effects have been found none appear to be observable in the
near future.


title: Do Quarks Obey D-Brane Dynamics? II

abstract:
  The cross section for two bosonic D0-branes is calculated in limit
$\alpha'\to 0$. It is found that the cross section shows Regge behavior.


title:
Two-loop corrections to the correlator of tensor currents in
  gluodynamics

abstract:
  Results of evaluating the leading order $\alpha_s$ corrections to the
correlator of tensor currents in pure gluodynamics are presented. These
corrections to the parton result for the correlator are not large numerically
that allows one to use perturbation theory for the analysis of the resonance
spectrum within the sum rules method.


title: R_b and R_l in MSSM without R-Parity

abstract:
  We examined Z\ell^+\ell^- and Zb\bar b couplings in the minimal
supersymmetric model (MSSM) with explicit R-parity violating interactions. We
found the top quark L-violating couplings \lambda'_{i3k} and B-violating
couplings \lambda''_{3j3} could give significant contributions through the top
quark loops. To accomadate the latest R_{\ell} data, \lambda'_{i3k} are suject
to stringent bounds, some of which can be much stronger than the current
bounds. Within the current perturbative unitarity bound of 1.25 for
\lambda''_{3j3}, the R_b value in R-violating MSSM agrees well with the
experimental data at $2\sigma$ level, but may lie outside the 1\sigma range
depending on the involved sfermion mass.


title:
Inflation in the five-dimensional universe with an orbifold extra
  dimension

abstract:
  New inflationary solutions to the Einstein equation are explicitly
constructed in a simple five-dimensional model with an orbifold extra dimension
$S^1/Z_2$. We consider inflation caused by cosmological constants for the
five-dimensional bulk and the four-dimensional boundaries. In our solutions the
extra dimension is static, and the background metric has a non-trivial
configuration in the extra dimension. In addition to the solution for a
vanishing bulk cosmological constant, which has already been discussed, we
obtain solutions for a non-zero one.


title: Magnetic Moments of Heavy Baryons

abstract:
  First non-trivial chiral corrections to the magnetic moments of triplet (T)
and sextet (S^(*)) heavy baryons are calculated using Heavy Hadron Chiral
Perturbation Theory. Since magnetic moments of the T-hadrons vanish in the
limit of infinite heavy quark mass (m_Q->infinity), these corrections occur at
order O(1/(m_Q \Lambda_\chi^2)) for T-baryons while for S^(*)-baryons they are
of order O(1/\Lambda_\chi^2). The renormalization of the chiral loops is
discussed and relations among the magnetic moments of different hadrons are
provided. Previous results for T-baryons are revised.


title: Spin structure function of the virtual photon

abstract:
  We investigate the spin structure of the virtual photon beyond the leading
order in QCD. The first moment of the virtual photon spin structure function
$g_1^\gamma(x,Q^2,P^2)$ with QCD effects turns out to be non-vanishing in
contrast to the real photon case. Numerical analysis for virtual as well as
real photon case is presented.


title: Single transverse spin asymmetries in inclusive hadron production

abstract:
  A consistent phenomenological approach to the computation of transverse
single spin asymmetries in inclusive hadron production is presented, based on
the assumed generalization of the QCD factorization theorem to the case in
which quark intrinsic motion is taken into account. New k_T and spin dependent
quark distribution and fragmentation functions are considered: some of them are
fixed by fitting data on p(transv. polarized) + p -> pion + X and predictions
are given for single spin asymmetries in l + p(transv. polarized) -> pion + X
and gamma^* + p(transv. polarized) -> pion + X processes.


title:
Search for Scalar Leptoquarks with polarized protons (and neutrons) at
  HERA and future $ep(n)$ Machines

abstract:
  The effects of Scalar Leptoquarks in various channels have been analysed for
the HERA collider and also for an eventual new $ep$ machine running at higher
energies. We emphasize the relevance of polarized beams.


title:
High Transverse Momentum Meson Production: A Different Way To Probe
  Hadron Structure

abstract:
  Hard, or high transverse momentum, pion photoproduction can be a tool for
probing the parton structure of the beam and target. We discuss the
perturbative and soft processes that contribute, and show how regions where
perturbative processes dominate can give us the parton structure information.
Polarized initial states are needed to get information on polarization
distributions. Current polarization asymmetry data is mostly in the soft
region. However, with the proposed EPIC machine parameters, determining the
polarized gluon distribution using hard pion photoproduction appears quite
feasible.


title: Drag Effects in Charm Photoproduction

abstract:
  We have refined a model for charm fragmentation at hadron colliders. This
model can also be applied to the photoproduction of charm. We investigate the
effect of fragmentation on the distribution of produced charm quarks. The drag
effect is seen to produce charm hadrons that are shifted in rapidity in the
direction of the beam remnant. We also study the importance of different
production mechanisms such as charm in the photon and from parton showers.


title:
The Triple-Alpha Process and the Anthropically Allowed Values of the
  Weak Scale

abstract:
  In multiple-universe models, the constants of nature may have different
values in different universes. Agrawal, Barr, Donoghue and Seckel have pointed
out that the Higgs mass parameter, as the only dimensionful parameter of the
standard model, is of particular interest. By considering a range of values of
this parameter, they showed that the Higgs vacuum expectation value must have a
magnitude less than 5.0 times its observed value, in order for complex
elements, and thus life, to form. In this report, we look at the effects of the
Higgs mass parameter on the triple-alpha process in stars. This process, which
is greatly enhanced by a resonance in Carbon-12, is responsible for virtually
all of the carbon production in the universe. We find that the Higgs vacuum
expectation value must have a magnitude greater than 0.90 times its observed
value in order for an appreciable amount of carbon to form, thus significantly
narrowing the allowed region of Agrawal et al.


title:
Measurement of the running b-quark mass using $e^+e^- \to b\bar{b}g$
  events

abstract:
  We have studied the determination of the running b-quark mass, $m_b(M_Z)$,
using $Z^0$ decays into 3 or more hadronic jets. We calculated the ratio of
$\geq3$-jet fractions in $e^+e^-\to b\bar{b}$ vs. $e^+e^-\to q_l\bar{q_l}$
($q_l$ = u or d or s) events at next-to-leading order in perturbative QCD using
six different infra-red- and collinear-safe jet-finding algorithms. We compared
with corresponding measurements from the SLD Collaboration and found a
significant algorithm-dependence of the fitted $m_b(M_Z)$ value. Our best
estimate, taking correlations into account, is $m_b(M_Z) = 2.56 \pm 0.27
(stat.) ^{+0.28}_{-0.38} (syst.) ^{+0.49}_{-1.48} (theor.) GeV/c^2$.


title: Angular and momentum asymmetry in particle production at high energies

abstract:
  Angular asymmetry and momentum disbalance for a pair of particles produced at
high energy in central rapidity region are studied. The asymmetry is
substantial for small momenta of produced particles but diminishes when they
rise.


title: A New Mechanism for Single Spin Asymmetries in Strong Interactions

abstract:
  It is shown that the contribution of the instantons to the fragmentation of
quarks leads to the appearance of a imaginary part in diagrams of quark-quark
scattering at large transfer momentum. The imaginary part comes from the
analytical continuation of the instanton amplitudes from Euclidean to Minkowsky
space-time and reflects quasiclassical origin of instanton solution of QCD
equations of motion. This phenomenon and instanton--induced quark spin-flip
give a new nonperturbative mechanism for the observed anomalous single-spin
asymmetries in hadron-hadron and lepton-hadron interactions.


title: Thinking About Top within the Standard Model

abstract:
  I present an overview of standard-model top-quark physics at the Fermilab
Tevatron. Topics discussed include the top-quark mass, weak interaction, strong
interaction, and rare decays.


title: Hadronic Regge Trajectories: Problems and Approaches

abstract:
  We scrutinized hadronic Regge trajectories in a framework of two different
models --- string and potential. Our results are compared with broad spectrum
of existing theoretical quark models and all experimental data from PDG98. It
was recognized that Regge trajectories for mesons and baryons are not straight
and parallel lines in general in the current resonance region both
experimentally and theoretically, but very often have appreciable curvature,
which is flavor-dependent. For a set of baryon Regge trajectories this fact is
well described in the considered potential model. The standard string models
predict linear trajectories at high angular momenta J with some form of
nonlinearity at low J.


title: Effects of Extra Dimensions on Unitarity and Higgs Boson Mass

abstract:
  We study the unitarity constraint on the two body Higgs boson elastic
scattering in the presence of extra dimensions. The contributions from exchange
of spin-2 and spin-0 Kaluza-Klein states can have large effect on the partial
wave amplitude. Unitarity condition restrict the maximal allowed value for the
ratio $r$ of the center of mass energy to the gravity scale to be less than
one. Although the constraint on the standard Higgs boson mass for $r$ of order
one is considerably relaxed, for small $r$ the constraint is similar to that in
the Standard Model. The resulting bound on the Higgs boson mass is not
dramatically altered if perturbative calculations are required to be valid up
to the maximal allowed value for $r$.


title: Meson PVV Interactions are determined by Quark Loops

abstract:
  We show that all abnormal parity three-body meson interactions can be
adequately described by quark loops, evaluated at zero external momentum, with
couplings determined by $U(N_f)$ symmetry. We focus primarily on radiative
meson decays which involve one pseudoscalar. The agreement with experiment for
non-rare decays is surprisingly good and requires very few parameters, namely
the coupling constants $g_{\pi qq}$ and $g_{\rho qq}$ and some mixing angles.
This agreement extends to some three-body decays that are dominated by pion
pairs in a P-wave state.


title:
Renormalization Group Approach to the O(N) linear Sigma Model at Finite
  Temperature

abstract:
  The Wilsonian renormalization group (RG) method is applied to finite
temperature systems for the study of non-perturbative methods in the field
theory. We choose the O(N) linear sigma model as the first step. Under the
local potential approximation, we solve the Wilsonian RG equation as a
non-linear partial differential equation numerically. The evolution of the
domain is taken into account using the naive cut and extrapolation procedure.
Our procedure is shown to yield the correct solution obtained by the auxiliary
field method in the large $N$ limit. To introduce thermal effects, we consider
two schemes. One in which the sum of the Matsubara frequencies are taken before
the scale is introduced is found to give more physical results. We observe a
second order phase transition in both the schemes. The critical exponents are
calculated and are shown to agree with the results from lattice calculations.


title: Deep inelastic lepton-hadron scattering as a test of perturbative QCD

abstract:
  Exploration of the small $x$ kinematic region by the HERA experiments led to
a revival of some models which existed before the advent of Quantum Chromo
Dynamics (QCD) as the theory of the strong interactions. Predictions of these
models for the deep inelastic structure functions are compared with those given
by QCD. Future experiments will concentrate on the large $x$-region and we will
discuss some issues which are important for the test of QCD. In particular we
emphasize the next-to-next-to-leading (NNLO) order analysis of the structure
functions and the determination of the strong coupling constant $\alpha_s$. We
also make some critical remarks about the relevance of so called large
corrections in the small and large $x$-region.


title:
On the Long Distance Contribution to the $B_s\to \gamma\gamma$ Decay in
  the Effective Lagrangian Approach

abstract:
  We re-estimate the decay branching ratio of $B_s\to 2\gamma$ through
$D_s^+D_s^-$ and $D_s^{*+}D_s^{*-}$ intermediate states, in the effective
Lagrangian approach. We find that the branching ratio does not exceed a few
times $10^{-7}$, contrary to the result recently claimed in the literature.


title: Review of recent results in spin physics

abstract:
  Recent results in polarized DIS are reviewed. Particular emphasis is placed
on new measurements of transverse and longitudinal asymmetries, on the tests of
the spin sum rules and on the analysis of the spin structure function $g_1$ in
perturbative QCD at NLO.


title: The primary protons and the atmospheric neutrino fluxes

abstract:
  The predictions of the atmospheric nu event rates are affected by significant
uncertainties, however the evidence for the `disappearance' of nu_mu's and
antinu_mu's obtained by SK and other underground detectors is robust and cannot
be accounted in the framework of the minimum standard model without assuming
very large ad hoc experimental systematic effects. The existence of `new
physics' beyond the standard model is therefore close to be established;
neutrino oscillations provide a very good fit to all data. The theoretical
uncertainties do have an important role in the detailed interpretation of the
data, and in the estimate of oscillation parameters.


title: Elastic rho production at HERA

abstract:
  Results on elastic electroproduction of rho mesons are presented for a photon
virtuality in the range 1 < Q^2 < 60 GeV^2 and for a hadronic centre of mass
energy in the range 30 < W < 140 GeV. The shape of the (pi pi) mass
distribution is discussed and measurements of the cross section dependences on
Q^2, W and t (the four-momentum transfer squared to the proton) are presented.
The full set of rho spin density matrix elements is measured, providing
information on the rho meson and on the photon polarisation states. In
particular, the ratio R of longitudinal to transverse gamma^*p cross section is
determined.


title: The Hard Diffraction in Vector Meson Production at HERA

abstract:
  Results on elastic vector meson production at HERA are presented in the
framework of perturbative QCD. The energy dependence of the cross section for
J/Psi photoproduction and for rho electroproduction is studied. A full
polarisation analysis, including the measurement of the 15 elements of the spin
density matrix and of R=sigma_L/sigma_T, is presented for rho
electroproduction. Finally heavier vector mesons (Psi' and Upsilon) production
is discussed.


title:
Additional Nucleon Current Contributions to Neutrinoless Double Beta
  Decay

abstract:
  We have examined the importance of momentum dependent induced nucleon
currents such as weak-magnetism and pseudoscalar couplings to the amplitude of
neutrinoless double beta decay in the mechanisms of light and heavy Majorana
neutrino as well as in that of Majoron emission. Such effects are expected to
occur in all nuclear models in the direction of reducing the light neutrino
matrix elements by about 30%. To test this we have performed a calculation of
the nuclear matrix elements of the experimentally interesting nuclei A = 76,
82, 96, 100, 116, 128, 130, 136 and 150 within the pn-RQRPA. We have found that
indeed such corrections vary somewhat from nucleus to nucleus, but in all cases
they are greater than 25 percent. In the case of heavy neutrino the effect is
much larger (a factor of 3). Combining out results with the best presently
available experimental limits on the half-life of the neutrinoless double beta
decay we have extracted new limits on the effective neutrino mass (light and
heavy) and the effective Majoron coupling constant.


title:
On b- and tau-multiplicities per event in SUSY (mSUGRA) and instrumental
  implications

abstract:
  We investigate the probability to find a b or tau in SUSY production with the
mSUGRA model. We find that in the entire parameter space the probability per
event to find a b-jet of E_T^b > 50 GeV within CMS acceptance (eta < 2.4) is
significant for all tan(beta), varying from a 10 % level to 90 % depending on
the m_0, m_1/2 region. The probabilities per event to find a tau with the same
kinematical cuts is also significant and it increases sharply with tan(beta).
These findings point to the central role a microvertex device would play in
case that SUSY (mSUGRA) is indeed realized in nature and found at the LHC.
First investigations done in the context of the more general MSSM scenario
confirm the findings based on mSUGRA.


title: Asymmetry of prompt photon production in p-p collisions at RHIC

abstract:
  The prompt photon production in p-p collisions at high energies is studied.
Double-spin asymmetry of the process is calculated by using Monte Carlo code
SPHINX. A possibility to discriminate the spin-dependent gluon distributions
and to determine sign of Delta G is discussed. Detailed study of expected
background, such as pi0 production and decay, is given. The predictions for the
longitudinal asymmetry of the prompt photons and pi0-meson production in the
p-p collisions at RHIC energies have been made.


title: A New Study of the Polarized Parton Densities in the Nucleon

abstract:
  We present a new next-to-leading order QCD analysis of the world data on
inclusive polarized deep inelastic lepton-nucleon scattering adding to the old
set of data the final SMC results, the HERMES proton and very recent SLAC/E155
deuteron data. We find an excellent fit to the data and present results for the
polarized parton densities in different factorization schemes. These results
are in a good agreement with what follows from the theory. We have also found
that the main effect of the newly incorporated data is a better determination
of the polarized gluon density.


title: Relations among Higher Order QCD corrections

abstract:
  We study the scheme transformation of next to leading order QCD corrections
to various processes. An interesting relation by Drell, Levy and Yan (DLY)
among space like and time like processes is studied carefully in the next to
leading order level. We construct factorisation scheme invariants and show that
they are DLY-invariant.


title:
Skewed distributions fixed by diagonal partons at small x,\xi and
  $\gamma^* p \to Vp$ at HERA

abstract:
  We show that the skewed parton distributions are completely determined at
small x and \xi by the conventional diagonal partons. We study the application
to diffractive vector meson production at HERA.


title:
Evidence for Statistical Production of J/psi Mesons in Nuclear
  Collisions at 158--200 A GeV

abstract:
  The hypothesis of statistical production of J/psi mesons at hadronization is
formulated and checked against experimental data. It explains in the natural
way the observed scaling behavior of the J/psi to pion ratio at the CERN SPS
energies. Using the multiplicities of J/psi and eta mesons the hadronization
temperature T_H = 175 MeV is found, which agrees with the previous estimates of
the temperature parameter based on the analysis of the hadron yield
systematics.


title: \bar u - \bar d asymmetry - a few remarks

abstract:
  We make a few remarks on possible sources of uncertainties of the $\bar d -
\bar u$ asymmetry obtained by different methods and comment on its possible
verification in the future. In addition we comment on its present
understanding.


title: Initial conditions and evolution of off-diagonal distributions

abstract:
  We briefly discuss the problem of specifying initial conditions for evolution
of off-diagonal (skewed) parton distributions. We present numerical results to
show that evolution rapidly washes out differences of input.


title: A QCD analysis of HERA and fixed target structure function data

abstract:
  The parton momentum densities in the proton are obtained from a NLO QCD
analysis of structure functions measured by HERA and fixed target experiments.
The uncertainties in these parton densities, the structure functions and
related cross sections are estimated from the experimental errors, taking into
account all correlations. Standard Model predictions for the charged current
Born cross sections at large x and Q2 are calculated and compared with recent
data from ZEUS.


title: Odderon and photon exchange in pseudoscalar meson production

abstract:
  We consider exclusive $\pi^0$ production in ep-scattering. At high energies
odderon and photon exchange contribute. The photon exchange contribution is
evaluated exactly using data for the total virtual photon-proton absorption
cross section. The odderon exchange contribution is calculated in
nonperturbative QCD, using functional integral techniques and the model of the
stochastic vacuum. For the proton we assume a quark-diquark structure as
suggested by the small odderon amplitude in pp and $p \bar{p}$ forward
scattering. We show that odderon exchange leads to a much larger inelastic than
elastic $\pi^0$ production cross section. Observing our process at HERA would
establish the soft odderon.


title: Theoretical Uncertainties in Gamma_sl(b->u)

abstract:
  I review the existing theoretical uncertainties in relating the semileptonic
decay width in b->u transitions to the underlying Kobayashi-Maskawa mixing
element |V_ub|. The theoretical error bars are only a few percent in |V_ub|,
with uncertainties from the impact of the nonperturbative effects nearly
negligible.


title: Competing Condensates in Two Dimensions

abstract:
  We generalize our previous 2-dimensional model in which a pairing condensate
psi-psi was generated at large N. In the present case, we allow for both
psi-psi and a chiral condensate psibar-psi to exist. We construct the effective
potential to leading order in 1/N, and derive the gap equations at finite
density and temperature. We study the zero density and temperature situation
analytically. We perform the renormalization explicitly and we show that the
physics is controlled by a parameter related to the relative strengths of the
interactions in the pairing and chiral channels. We show that although a
solution to the gap equations exists in which both condensates are
non-vanishing, the global minimum of the effective potential always occurs for
the case when one or the other condensate vanishes.


title: Unitarization of Total Cross Section and Coherent Effect in pQCD

abstract:
  A formula to unitarize the leading-log BFKL-Pomeron amplitude is derived
using a coherent property of two-body collision in the peripheral region. This
procedure also allows an algebraic characterization of the Reggeon in QCD based
on color, instead of the total angular momentum of the gluons being exchanged.


title: Aspects of high density effective theory in QCD

abstract:
  We study an effective theory of QCD at high density in detail, including the
finite temperature effects and the leading order correction in $1/\mu$
expansion. We investigate the Cooper pair gap equation and find that the
color-flavor locking phase is energetically preferred at high density. We also
find the color-superconducting phase transition occurs in dense quark matter
when the chemical potential is larger than $250\pm 100~{\rm MeV}$ and the
temperature is lower than 0.57 times the Cooper pair gap in the leading order
in the hard-dense-loop approximation. The quark-neutrino four-Fermi coupling
and the quark-axion coupling receive significant corrections in dense quark
matter.


title:
Nucleon Mass Corrections to Spin Dependent Structure Functions and
  Relations Between their Twist-3 Contributions

abstract:
  The nucleon mass corrections are calculated to all polarized structure
functions for neutral and charged current deep inelastic scattering in lowest
order in the coupling constant. The impact of the target mass corrections on
the general relations between the twist--2 and twist--3 parts of the structure
functions is studied and three new relations between the twist--3 contributions
are derived. The size of nucleon mass corrections for the $g_1$ and $g_2$
structure functions are estimated.


title:
Axial Vector Amplitudes, Second Order Fermions, and Standard Model
  Photon -- Neutrino Processes

abstract:
  We present an extension of the string-inspired technique suitable to the
calculation of amplitudes and effective Lagrangians involving both vector and
axial vector gauge fields. The technique is easily adaptable to problems
involving constant external fields. We demonstrate the advantages of the
formalism by a calculation of the one-loop vector-axialvector amplitude in a
general constant electromagnetic field. The relevance of this calculation for
photon-neutrino processes is commented upon. We also clarify the properties of
the formalism with respect to the chiral symmetry, and its connection to second
order fermions.


title:
Searches For New Bosons Coupling To e-q Pairs At HERA And Other
  Colliders

abstract:
  The early observation at HERA of an excess of events compared to the
expectation from the Standard Model in very short distance $e^+p$
deep-inelastic scattering processes has renewed the interest in the search for
new physics which could manifest in electroweak-like interactions. New
preliminary results from the H1 and ZEUS experiments making use of all
available $e^+p$ data are reviewed here, with an emphasis on the search for new
bosons possessing Yukawa couplings to lepton-quark pairs. The sensitivity of
HERA to leptoquarks, and to squarks of R-parity violating supersymmetry, is
confronted to existing indirect constraints from rare and forbidden
semi-leptonic decays, atomic parity violation and neutrinoless double-beta
decay, as well as to direct constraints from LEP and Tevatron colliders. The
HERA and Tevatron colliders are found to offer exciting prospects for new
physics, accessing yet unexplored domains of the mass-coupling plane. Possible
striking manifestation of explicit lepton flavour violation is also discussed.


title: Hamiltonian renormalization for bound state problem in gluodynamics

abstract:
  The systematic approach to study bound states in gluodynamics is presented.
The method utilizes flow equations together with low-energy phenomenology, that
provides the perturbative renormalization scaling in conjuction with the change
of the basis to constituent gluon states. The renormalized effective
Hamiltonian of gluodynamics up to the second order is obtained at low energies,
which provides a kind of constituent gluon model for glueball bound states. The
approach allows to include perturbative QCD corrections into nonperturbative
calculations of many-body techniques. The performed numerical calculations
support the constituent picture of hadronic observables.


title: New Physics Effects in $B \to K^(*) \nu \nu$ Decays

abstract:
  We present a model-independent analysis of rare B decays, $B \to K^{(*)} \nu
\nu$. The effect of possible new physics is written in terms of dimension-6
four-fermi interactions. The lepton number violating scalar- and tensor-type
interactions are included, and they induce $B \to K^{(*)} \nu \nu ({\bar \nu}
{\bar \nu})$ decays. We show systematically how the branching ratios and
missing mass-squared spectrum depend on the coefficients of the four-fermi
interactions.


abstract:
  We consider $b \to s \gamma$ decays in the Left-Right Symmetric Model. Values
of observables sensitive to chiral structure such as the $\Lambda$ polarization
in the $\Lambda_b \to \Lambda \gamma$ decays and the mixing-induced CP
asymmetries in the $B_{d,s} \to M^0 \gamma$ decays can deviate in the LRSM
significantly from the SM values. The combined analysis of $P_\Lambda$ and
$A_{CP}$ as well as ${\cal BR}(b \to s \gamma)$ can be used to determine the
model parameters.


title:
Analyzing powers in inclusive pion production at high energy and the
  nucleon spin structure

abstract:
  Analyzing powers in inclusive pion production in high energy transversely
polarized proton-proton collisions are studied theoretically in the framework
of the quark recombination model. Calculations by assuming the SU(6)
spin-flavor symmetry for the nucleon structure disagree with the experiments.
We solve this difficulty by taking into account the %We overcome this
difficulty by taking into account the realistic spin distribution functions of
the nucleon, which differs from the SU(6) expectation at large $x$, %but
coincides with a perturbative QCD constraint on the ratio of the unpolarized
valence distributions, $u/d \to 5$ as $x \to 1$. We also discuss the kaon spin
asymmetry and find $A_N(K^+) = -A_N(K^0)$ in the polarized proton-proton
collisions at large $x_F$.


title: Polarized Fragmentation Functions

abstract:
  In this talk I present a review on the theoretical status of polarized
fragmentation functions and the prospects for conceivable future semi-inclusive
deep-inelastic scattering and proton-proton collision experiments to measure
them.


title: Energetics of neutrinos in neutron stars

abstract:
  I review our proof that long range forces induced by the exchange of massless
neutrino-antineutrino pairs do not affect the stability of neutron stars.


title: Low x News for Monte Carlo

abstract:
  This talk,given at Monte Carlo Workshop, is a review of news in low $x$
physics which, I think, would be useful for writing of the Monte Carlo codes.
The following topics are discussed here: (i) the next-to-leading order BFKL
Pomeron; (ii) two indications for shadowing corrections (SC) in DIS from HERA
data; (iii) matching of "soft" and "hard" photon - proton interactions; and
(iv) survival probability for large rapidity gap (LRG) processes in
hadron-hadron scattering and DIS. I hope, that our current understanding of
these topics will allow us to narrow the gap between the MC codes and our
microscopic theory - QCD.


title: Renormalization Group Improved BFKL Equation

abstract:
  I report on the recent proposal of a generalized small-x equation which, in
addition to exact leading and next-to-leading BFKL kernels, incorporates
renormalization group constraints in the relevant collinear limits.


title: Estimates of T-odd distribution and fragmentation functions

abstract:
  Estimates of the T-odd fragmentation and distribution functions, $H_1^\perp$
and $f_{1T}^{\perp}$, are presented. Our evaluations are based on a fit on
experimental data of polarized proton-proton scattering. We use our estimates
to make predictions for electron polarized-proton azimuthal asymmetries.


title: Neutrino Masses and Mixings: a Theoretical Perspective

abstract:
  We briefly review the recent activity on neutrino masses and mixings which
was prompted by the confirmation of neutrino oscillations by the
Superkamiokande experiment.


title: Diffractive Interactions at DIS99: Experimental Summary

abstract:
  Experimental results on diffraction, which were presented at the 7th
International Workshop on Deep Inelastic Scattering and QCD (DIS99), are
summarized.


title: Gluons in small-$x_B$ deep-inelastic scattering

abstract:
  The existing data obtained in deep-inelastic scattering (DIS) experiments in
the kinematical region $x_B \approxle 10^{-2}$ and $Q^2 \ge 5 {GeV}^2$ are
examined to gain further insight into the dynamics of interacting gluons. It is
shown that not only the regularities observed in diffractive scattering and
those found in large-transverse-momentum jet production, but also the striking
features of the structure function $F_2(x_B,Q^2)$ observed in normal DIS-events
in this kinematical region can be understood as direct consequences of
self-organized criticality. The results explicitly demonstrate the usefulness
of concepts and methods of Complex Sciences in understanding the various
striking features observed in high-energy collision processes in which ``soft''
gluons play the dominating role.


title: Relativistic corrections to the Pionium Lifetime

abstract:
  Next to leading order contributions to the pionium lifetime are considered
within non-relativistic effective field theory. A more precise determination of
the coupling constants is then needed in order to be consistent with the
relativistic pion-pion scattering amplitude which can be obtained from chiral
perturbation theory. The relativistic correction is found to be 4.1% and
corresponds simply to a more accurate value for the non-relativistic decay
momentum.


title: Monopoles and Coulomb Gas Representation of the QCD Effective Lagrangian

abstract:
  A novel Coulomb gas (CG) description of low energy QCD_4(N_c) is constructed.
The construction is based on the dual transformation of the QCD effective
Lagrangian. By considering a large gauge transformation, the charges of this
statistical system are identified with magnetic monopoles which carry
fractional charges of strength 1/N_c. Furthermore, the creation operator which
inserts the magnetic charge in the CG picture is explicitly constructed and
demonstrated to have a non-zero vacuum expectation value, indicating that
confinement does occur. The Wilson loop operator as well as the creation
operator for the domain wall in CG representation is also constructed.
Additional support for the D-brane picture suggested by Witten is also found.
Lastly, the relation of the CG picture with the instanton-quarks is also
discussed.


title: West Indies or Antarctica -- Direct CP Violation in B Decays

abstract: A Discovery Voyage into The Age of: PENGUINS (chubby little figure).


title: The Hadronic Tau Decay Signature of a Heavy Charged Higgs Boson at LHC

abstract:
  The hadronic tau decay channel offers by far the best signature for heavy
charged Higgs boson search at the LHC in the large $\tan\beta$ region. By
exploiting the distinct polarization of the tau and its large transverse mass,
along with the accompanying missing--$p_T$, one can probe for a charged Higgs
boson up to a mass of about 600 GeV in an essentially background-free
environment. The transverse mass distribution of the tau jet also provides a
fairly unambiguous estimate of the charged Higgs boson mass.


title: Effective Field Theory Approach to Pionium

abstract:
  The various dynamical scales below the pion mass involved in $\pi^{+}$
$\pi^{-}$ atoms are sequentially integrated out using non-relativistic
effective field theory techniques. This allows us to systematically organise
the corrections to the energy levels and decay width. We present our results in
terms of a single unknown constant which may be obtained by matching to the
Chiral Lagrangian with electromagnetic interactions at two loops.


title:
Transverse Double-Spin Asymmetries for Dimuon Production in pp
  Collisions

abstract:
  We calculate the transverse double-spin asymmetry for the production of
dimuons in pp collisions as function of the dimuon rapidity and mass to
next-to-leading accuracy in the strong coupling. Predictions for BNL-RHIC and
HERA-N are made by assuming a saturation of Soffer's inequality at a low
hadronic input scale. It seems unlikely that transversity can be measured in
dimuon production at RHIC.


title: Heavy quark photoproduction

abstract:
  I present a review of selected topics in the computation of heavy flavour
cross sections in photon-hadron collisions.


title: Isolated-photon production in polarized hadronic collisions

abstract:
  After a short discussion on the definition of isolated-photon cross sections
in perturbative QCD, I present phenomenological predictions relevant for
polarized hadron-hadron collisions in the RHIC energy range. The possibility of
measuring $\Delta g$ is investigated.


title: Physics Overview

abstract:
  Recent developments of physics at the TeV energy scale, especially physics
related to the electron-positron linear colliders are briefly reviewed. The
topics include the present status of the standard model, Higgs physics,
supersymmetry, strongly interacting electroweak symmetry breaking mechanism,
and top quark physics.


title: Recent Progress in QCD

abstract:
  The past few years have seen remarkable progress in the theory and
phenomenology of QCD, bringing perturbative and nonperturbative methods into
closer contact with each other and with experiment.


title:
Constraining an R-parity violating supersymmetric theory from the
  SuperKamiokande data on atmospheric neutrinos

abstract:
  The constraints on an R-parity violating supersymmetric theory arising from
the recent SuperKamiokande results on atmospheric neutrinos are studied, with
special reference to a scenario with bilinear R-parity violating terms.
Considering both the fermionic and scalar sectors, we find that a large area of
the parameter space is allowed, in terms of both the lepton-number violating
entries in the superpotential and the soft R-violating terms in the scalar
potential, and that no fine-tuning is required. However, the need to avoid
flavour changing neutral currents puts additional restrictions on the theory,
requiring either the R-violating terms in the superpotential to be smaller than
the R-conserving ones, or a hierarchy in the R-violating parameters for
different lepton flavours in the superpotential.


title: 1S and MSbar Bottom Quark Masses from Upsilon Sum Rules

abstract:
  The bottom quark 1S mass, $M_b^{1S}$, is determined using sum rules which
relate the masses and the electronic decay widths of the $\Upsilon$ mesons to
moments of the vacuum polarization function. The 1S mass is defined as half the
perturbative mass of a fictitious ${}^3S_1$ bottom-antibottom quark bound
state, and is free of the ambiguity of order $\Lambda_{QCD}$ which plagues the
pole mass definition. Compared to an earlier analysis by the same author, which
had been carried out in the pole mass scheme, the 1S mass scheme leads to a
much better behaved perturbative series of the moments, smaller uncertainties
in the mass extraction and to a reduced correlation of the mass and the strong
coupling. We arrive at $M_b^{1S}=4.71\pm 0.03$ GeV taking
$\alpha_s(M_Z)=0.118\pm 0.004$ as an input. From that we determine the
$\bar{MS}$ mass as $\bar m_b(\bar m_b) = 4.20 \pm 0.06$ GeV. The error in $\bar
m_b(\bar m_b)$ can be reduced if the three-loop corrections to the relation of
pole and $\bar{MS}$ mass are known and if the error in the strong coupling is
decreased.


title:
Diphoton Background to Higgs Boson Production at the LHC with Soft Gluon
  Effects

abstract:
  The detection and the measurement of the production cross section of a light
Higgs boson at the CERN Large Hadron Collider demand the accurate prediction of
the background distributions of photon pairs. To improve this theoretical
prediction, we present the soft-gluon resummed calculation of the $p p \to
\gamma \gamma X$ cross section, including the exact one loop $g g \to \gamma
\gamma g$ contribution. By incorporating the known fixed order results and the
leading terms in the higher order corrections, the resummed cross section
provides a reliable prediction for the inclusive diphoton invariant mass and
transverse momentum distributions. Given our results, we propose the search for
the Higgs boson in the inclusive diphoton mode with a cut on the transverse
momentum of the photon pair, without the requirement of an additional tagged
jet.


title: Mass Bounds for Flavour Mixing Bileptons

abstract:
  Mass bounds for doubly-charged bilepton gauge bosons are derived from
constraints on fermion pair production at LEP and lepton-flavour violating
charged lepton decays. The limit obtained of 700 GeV for the doubly-charged
bilepton does not depend on the bilepton coupling being flavour-diagonal,
unlike other bounds which have been given in the literature.


title: Virtual annihilation contribution to orthopositronium decay rate

abstract:
  Order alpha^2 contribution to the orthopositronium decay rate due to
one-photon virtual annihilation is found to be
  delta Gamma = (alpha/pi)^2 (pi^2 ln(alpha) - 0.8622(9))Gamma_LO.


title: CCFM prediction for F_2 and forward jets at HERA

abstract:
  Predictions of the CCFM evolution equation for F_2 and forward jets at HERA
energies are obtained from a modified version of the Monte Carlo program
SMALLX. The treatment of the non-Sudakov form factor $\Delta_{ns}$ is discussed
as well as the effect of the so called "consistency constraint". For the first
time a good description of F_2 and the forward jet data is obtained from the
CCFM equation.


title: Photoproduction and electroproduction of charm at high energies

abstract:
  We estimate the differential and total cross sections for both the
photoproduction of vector D*-meson and its yield in deep inelastic scattering
at the HERA collider in the framework of model motivated by perturbative
calculations in QCD. The offered model allows us to take into account higher
twists over the transverse momentum of meson at p_T ~ m_c and to correctly
approach the dominance of $c$-quark fragmentation at p_T >> m_c. We consider a
possibility for the hadronization of color-octet c q-bar state into the meson.
The combined contribution by the singlet and octet-color terms results in a
good agreement with the experimental data for both the photoproduction and the
production in deep inelastic scattering.


title: The One-Dimensional Spinless Relativistic Coulomb Problem

abstract:
  Motivated by a recent analysis which presents explicitly the general
solution, we consider the eigenvalue problem of the spinless Salpeter equation
with a ("hard-core amended") Coulomb potential in one dimension. We prove the
existence of a critical coupling constant (which contradicts the assertions of
the previous analysis) and give analytic upper bounds on the energy
eigenvalues. These upper bounds seem to disprove the previous explicit
solution.


title: High-t Diffraction

abstract:
  The study of those rapidity gap processes where a large momentum is
transferred across the rapidity gap provides an ideal opportunity to understand
the gap producing mechanism wholly within the framework of QCD perturbation
theory. The current theoretical and experimental status of this `high-t
diffraction' is reviewed.


title: Determining SUSY Parameters from Chargino Pair Production

abstract:
  A procedure to determine the chargino mixing angles and, subsequently, the
fundamental SUSY parameters M2, mu and tan(beta) by measurements of the total
cross section and the spin correlations in e+e- annihilation to chi1^+ chi1^-
chargino pairs is discussed.


title: Transversity distributions and Drell-Yan spin asymmetries

abstract:
  We discuss transversity distributions and Drell-Yan transverse double spin
asymmetries. First, the antiquark flavor asymmetry $\Delta_{_T} \bar
u/\Delta_{_T} \bar d$ is discussed by using two different descriptions, a
meson-cloud model and a Pauli exclusion model. We find that both calculations
produce a significant $\Delta_{_T} \bar d$ excess over $\Delta_{_T} \bar u$.
Next, we study its effects on the transverse spin asymmetry $A_{_{TT}}$ and on
the Drell-Yan proton-deuteron asymmetry $\Delta_{_T}\sigma^{pd}/2
\Delta_{_T}\sigma^{pp}$. We find that the ratio $\Delta_{_T}\sigma^{pd}/2
\Delta_{_T}\sigma^{pp}$ is very useful for investigating the flavor asymmetry
effect.


title: DIANA, a program for Feynman Diagram Evaluation

abstract:
  A C-program DIANA (DIagram ANAlyser) for the automatic Feynman diagram
evaluation is presented.


title: Spin dependence of diffractive DIS

abstract:
  I review the recent progress in the theory of s-channel helicity
nonconservation (SCHNC) effects in diffractive DIS including the unitarity
driven demise of the Burkhardt-Cottingham sum rule and strong scaling departure
from the Wandzura-Wilczek relation.


title: Intrinsic $k_{\perp}$ in the pomeron

abstract:
  In a consistent QCD approach to diffractive DIS gluons in the pomeron have
soft $z_{g}$ distribution and very broad intrinsic $k_{\perp}$ distribution.
The latter has not yet been incorporated into diffractive Monte-Carlo
generators (RAPGAP,....). I argue that the so-introduced bias in the
diffractive jet analysis may be the reason why H1 Collaboration finds the very
large and hard gluon content of the pomeron. I discuss possible direct
experimental determinations of intrinsic $k_{\perp}$ in the pomeron.


title: Parton correlations in the proton; going beyond collinearity

abstract:
  We discuss specific observables that can be measured in deep inelastic
leptoproduction in the case of 1-particle inclusive measurements, namely
azimuthal asymmetries. These asymmetries contain information on the intrinsic
transverse momentum of partons, with close connection to the gluon dynamics in
hadrons.


title:
Unitarity and nonperturbative effects in the spin structure functions at
  small $x$

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


title: Contact Interactions: Results from ZEUS and a Global Analysis

abstract:
  In a search for signatures of physics processes beyond the Standard Model,
various eeqq vector contact interaction hypotheses have been tested in the ZEUS
experiment. No significant evidence of a contact interaction signal has been
found. The analysis is based on NC e+p DIS data corresponding to an integrated
luminosity of 47.7 pb-1 and results in 95% CL limits on the effective mass
scales Lambda ranging from 1.7 to 5 TeV for the different one-parameter contact
interaction scenarios considered.
  Within the global analysis, including data from other experiments as well,
any contact interactions with mass scale below 2.1 TeV are excluded at 95% CL.
Combined mass scale limits for specific one-parameter scenarios range from 5.1
to 18 TeV. Upper limits on possible effects to be observed in future HERA, LEP
and Tevatron running are estimated. The total hadronic cross-section at LEP and
e-p scattering cross-section at HERA are strongly constrained by existing data,
whereas large cross-section deviations are still possible for Drell-Yan lepton
pair production at the Tevatron.


title: Renormalization Group Improved Small-x Equation

abstract:
  We propose and analyze an improved small-x equation which incorporates exact
leading and next-to-leading BFKL kernels on one hand and renormalization group
constraints in the relevant collinear limits on the other. We work out in
detail the recently proposed omega-expansion of the solution, derive the
Green's function factorization properties and discuss both the gluon anomalous
dimension and the hard pomeron. The resummed results are stable, nearly
renormalization-scheme independent, and join smoothly with the fixed order
perturbative regime. Two critical hard pomeron exponents are provided, which -
for reasonable strong-coupling extrapolations - are argued to provide bounds on
the pomeron intercept.


title: Probing the QCD pomeron in doubly tagged e^+ e^- collisions

abstract:
  We calculate the total cross-section for $\gamma^* \gamma^*$ collisions and
for the process $e^+ e^- \to e^+ e^- + hadrons$ with two tagged leptons
assuming dominance of the QCD pomeron exchange. We solve the BFKL equation
including the dominant subleading effects generated by the consistency
constraint which restricts the available phase-space of the emitted gluons to
the region inwhich the virtuality of the exchanged gluons is dominated by their
transverse momentum squared. Estimate of the possible soft pomeron contribution
to the $\gamma^* \gamma^*$ cross-section is also presented. At very high CM
energies $W$ the calculated total $\gamma^* \gamma^*$ cross-section exhibits
effective power-law $(W^2)^{\lambda}$ behaviour with $\lambda \sim 0.3$. We
confront our results with the recent measurements at LEP and give predictions
for the energies which can be accessible at TESLA and at other future linear
$e^+ e^-$ colliders.


title:
Bounds on New Physics from the New Data on Parity Violation in Atomic
  Cesium

abstract:
  We assume the latest experimental determination of the weak charge of atomic
cesium and analyze its implications for possible new physics. We notice that
the data would imply positive upper and lower bounds on the new physics
contribution to the weak charge, $\delta_NQ_W$. The required new physics should
be of a type not severely constrained by the high energy precision data. A
simplest possibility would be new neutral vector bosons almost un-mixed to the
$Z$ and with sizeable couplings to fermions. The lower positive bound would
however forbid zero or negative $\delta_NQ_W$ and exclude not only the standard
model but also models with sequential $Z^\prime$, in particular simple-minded
towers of $Z$-like excitations from extra-dimensions. The bound would also
imply an upper limit on the $Z^\prime$ mass within the models allowed.
Conclusions are also derived for models of four-fermion contact interactions.


title: Plasmon interactions in the quark-gluon plasma

abstract:
  Yang-Mills theory at finite temperature is rewritten as a theory of plasmons
which provides a Hamiltonian framework for perturbation theory with resummation
of hard thermal loops.


title: Hard diffraction and QCD multi-Pomeron vertices

abstract:
  We discuss the phenomenological and theoretical implications of recent
progresses in the evaluation of multi-Pomeron vertices in high-energy
perturbative QCD.


title: Additional phases induced by the supersymmetric CP phases

abstract:
  The explicit CP violation in the MSSM radiatively induces a finite
unremovable alignment between the Higgs doublets. This additinal phase can be
as large as the original CP phases in certain portions of the MSSM parameter
space. Considering the specific case of the charginos, this additional phase is
shown to induce a conceivable amount of CP violation near the would--be CP
conserving points. Moreover, the CP violation in the absence of this phase is
smaller than the one in the presence of it, and the former can never compete
with the latter, however large $\tan\beta$ is.


title:
First-order chiral phase transition may naturally lead to the
  ``quenched'' initial condition and strong soft-pion fields

abstract:
  We propose a novel mechanism for DCC formation in a first-order chiral phase
transition. In this case the effective potential for the chiral order parameter
has a local minimum at $\Phi\sim 0$ in which the chiral field can be
``trapped''. If the expansion is sufficiently fast a bubble of disoriented
chiral field can emerge and decouple from the rest of the fireball. The bubble
may overshoot the mixed phase and subsequently supercool until the barrier
disappears, when the potential resembles that at T=0. This situation
corresponds to the initial condition realized in a ``quench''. Thus, the
subsequent alignment in the vacuum direction leads to strong amplification of
low momentum modes of the pion field. We propose that these DCCs could
accompany the previously suggested baryon rapidity fluctuations.


title: Towards a lattice calculation of $\Delta q$ and $\delta q$

abstract:
  Within the framework of lattice QCD a high statistics computation of the
nucleon axial and tensor charges is given. Particular attention is paid to the
chiral and continuum extrapolations.


title: Analysis of Rapidity Gap Cuts in Diffractive DIS

abstract:
  The requirement of a large pseudo-rapidity gap to select diffractive DIS
events at HERA restricts the kinematically accessible region of phase space for
a significant range of $Q^2$, $\beta$ and $\xpom$. Consequences of this include
a breakdown of $\xpom$-factorization in large rapidity gap diffractive samples
and an enhancement in the relative contribution of quark-antiquark-gluon
processes over dijet processes in the diffractive DIS sample.


title: Elements of a field theory of unitarity corrections

abstract:
  I explain the motivation for investigating the high energy limit of QCD and
give a brief presentation of recent progress in the understanding of unitarity
corrections in this kinematic regime. Special emphasis is given to the
conformal field theory structure discovered in these unitarity corrections.


title: Trilinear R-Parity Violation: Theory to Experiment

abstract:
  Supersymmetric models without conservation of R-parity are reviewed and
low-energy constraints on the extra trilinear couplings listed. Current
searches at the LEP, Tevatron and HERA colliders are then summed up. Prospects
for further study, especially at future colliders, are briefly touched upon.


title: Mirage Gauge Coupling Unification and TeV Scale Strings

abstract:
  We consider gauge coupling unification in models with TeV scale strings and
large compact dimensions realized as type IIB string orientifolds. Following an
observation by Ibanez we show that the gauge couplings at low energies can
behave as if they effectively unify at $M_U \sim 2 \times 10^{16} GeV$ with
$\alpha_U \sim 1/24$. This requires the $\sigma$ model anomaly coefficients
$b_a^{i'}$ not to be all equal and their ratio to the $\beta$-functions of
minimally supersymmetric Standard Model $\beta_a$ to be a constant independent
of the gauge group. If, in addition, $b_a^{i'}$ have a gauge group independent
constant piece the relation between the unified gauge coupling and the dilaton
VEV is modified so that there can be weakly coupled gauge theories arising from
strongly coupled strings.


title: Structure functions in polarized proton-deuteron Drell-Yan processes

abstract:
  Polarized proton-deuteron (pd) Drell-Yan processes are investigated for
studying new spin structure of a spin-1 hadron. Our formalism indicates that
there exist many structure functions: 108 in general and 22 in the \vec
Q_T-integrated case. A naive parton model suggests that at least one of them
should be related to the tensor polarized distributions, which have not been
measured at all. There are some experimental possibilities at FNAL, HERA, and
RHIC to study the polarized pd reactions.


title: Constraints on an enhanced sbar d Z vertex from epsilon'/epsilon

abstract:
  We analyze rare kaon decays in models in which the dominant new effect is an
enhanced sbar d Z vertex Z_{ds}. We point out that in spite of large
theoretical uncertainties the CP-violating ratio epsilon'/epsilon provides at
present the strongest constraint on Im Z_{ds}. Assuming 1.5 10^{-3} <
epsilon'/epsilon < 3 10^{-3} and Standard Model values for the CKM parameters
we obtain the bounds BR(K_L -> pi^0 nu nubar) < 3.9 10^{-10} and BR(K_L -> pi^0
e^+ e^-)_{dir} < 7.9 10^{-11}. Using the bound on Re Z_{ds} from K_L -> mu^+
mu^- we find BR(K^+ -> pi^+ nu nubar) < 2.6 10^{-10}. We also discuss new
physics scenarios in which in addition to an enhanced sbar d Z vertex also
neutral meson mixing receives important new contributions. In this case our
most conservative bounds are BR(K_L -> pi^0 nu nubar) < 1.8 10^{-9}, BR(K_L ->
pi^0 e^+ e^-)_{dir} < 2.8 10^{-10} and BR(K^+ -> pi^+ nu nubar) < 6.1 10^{-10}.
The dependence of the upper bound for BR(K_L -> pi^0 nu nubar) on the CKM
parameters is also analyzed.


title: High-t Diffraction at HERA

abstract:
  The double dissociation photoproduction cross section for the process gamma p
-> XY, in which the systems X and Y are separated by a large rapidity gap, is
measured at large 4-momentum transfer squared |t| > 20 GeV^2 by the H1
Collaboration at HERA. This measurement provides for the first time a direct
measurement of the energy dependence of the gap production process at high |t|.


title: Spin Dependence of Deep Inelastic Diffraction

abstract:
  Using a perturbative model for diffractive interactions, we derive an
expression for the polarized diffractive structure function $g_1^D$ in the high
energy limit. This structure function is given by the interference of
diffractive amplitudes with polarized and unpolarized exchanges. For the
polarized exchange we consider both two-gluon and quark-antiquark amplitudes.
The polarized diffractive amplitude receives sizable contributions from
non-strongly ordered regions in phase space, resulting in a double logarithmic
enhancement at small $x$. The resummation of these double logarithmic terms is
outlined. We also discuss the transition from our perturbative expression to
the nonperturbative region. A first numerical estimate indicates that the
perturbative contribution to the spin asymmetry is substantially larger than
the nonperturbative one.


title: Single spin asymmetry in DVCS

abstract:
  In the following note, we will present an estimation of the single spin
asymmetry in deeply virtual Compton scattering (DVCS) which directly allows one
to test predictions of the ratio of the imaginary part of the amplitude in DIS
to DVCS, as well as access the skewed parton distributions at small $x$ in the
DGLAP region. We find it to be large for the HERA kinematics to be accessible
in forthcoming runs with polarized electrons.


title: Constraints on Phases of Supersymmetric Flavour Conserving Couplings

abstract:
  In the unconstrained MSSM, we reanalyze the constraints on the phases of
supersymmetric flavour conserving couplings that follow from the electron and
neutron electric dipole moments (EDM). We find that the constraints become weak
if at least one exchanged superpartner mass is >O(1 TeV) or if we accept large
cancellations among different contributions. However, such cancellations have
no evident underlying symmetry principle. For light superpartners, models with
small phases look like the easiest solution to the experimental EDM
constraints. This conclusion becomes stronger the larger is the value of
$\tan\beta$. We discuss also the dependence of $\epsilon_K$, $\Delta m_B$ and
$b\to s\gamma$ decay on those phases.


title:
Fermionic dispersion relations at finite temperature and non-vanishing
  chemical potentials in the minimal standard model

abstract:
  We calculate the fermionic dispersion relations in the minimal standard model
at finite temperature in presence of non-vanishing chemical potentials due to
the CP-asymmetric fermionic background. The dispersion relations are calculated
for a vacuum expectation value of the Higgs field equal to zero (unbroken
electroweak symmetry). The calculation is performed in the real time formalism
of the thermal field theory at one-loop order in a general $\xi$ gauge. The
fermionic self-energy is calculated at leading order in temperature and
chemical potential and this fact permits us to obtain gauge invariant
analytical expressions for the dispersion relations.


title: New physics in ttbar spin correlations at the Tevatron

abstract:
  We show that the angular distributions of leptons or jets due to ttbar spin
correlations allow a determination of the top chromomagnetic moment kappa with
an accuracy of order 0.1. The method is quite insensitive to background, event
reconstruction, and other experimental uncertainties. The total event number is
important, so we suggest the inclusion of all-hadronic events.


title:
Bounds on R-parity Violating Couplings at the Weak Scale and at the GUT
  Scale

abstract:
  We present an update of the most stringent experimental bounds on the
trilinear R-parity violating couplings. We then analyse bounds on the R-parity
violating couplings at the unification scale by renormalising the weak scale
bounds. We derive unification scale upper bounds upon the couplings which are
broadly independent of the fermion mass texture assumed. The R-parity violating
couplings are factors of two to five more severely bounded at the unification
scale than at the electroweak scale. In the presence of quark mixing, a few of
the bounds are orders of magnitude stronger than their weak scale counterparts
due to new R-parity violating operators being induced in the renormalisation
between high and low scales. These induced bounds are fermion mass texture
dependent. New bounds upon the weak scale couplings are obtained by the
requirement of perturbativity between the weak and unification scales. A
comprehensive set of the latest limits is included.


title: Effective Transport Equations for non-Abelian Plasmas

abstract:
  Starting from classical transport theory, we derive a set of covariant
equations describing the dynamics of mean fields and their statistical
fluctuations in a non-Abelian plasma in or out of equilibrium. A general
procedure is detailed for integrating-out the fluctuations as to obtain the
effective transport equations for the mean fields. In this manner, collision
integrals for Boltzmann equations are obtained as correlators of fluctuations.
The formalism is applied to a hot non-Abelian plasma close to equilibrium. We
integrate-out explicitly the fluctuations with typical momenta of the Debye
mass, and obtain the collision integral in a leading logarithmic approximation.
We also identify a source for stochastic noise. The resulting dynamical
equations are of the Boltzmann-Langevin type. While our approach is based on
classical physics, we also give the necessary generalizations to study the
quantum plasmas. Ultimately, the dynamical equations for soft and ultra-soft
fields change only in the value for the Debye mass.


title: Feynman-Schwinger representation approach to nonperturbative physics

abstract:
  The Feynman-Schwinger representation provides a convenient framework for the
cal culation of nonperturbative propagators. In this paper we first investigate
an analytically solvable case, namely the scalar QED in 0+1 dimension. With
this toy model we illustrate how the formalism works. The analytic result for
the self energy is compared with the perturbative result. Next, using a
$\chi^2\phi$ interaction, we discuss the regularization of various divergences
encountered in this formalism. The ultraviolet divergence, which is common in
standard perturbative field theory applications, is removed by using a
Pauli-Villars regularization. We show that the divergence associated with large
values of Feynman-Schwinger parameter $s$ is spurious and it can be avoided by
using an imaginary Feynman parameter $is$.


abstract:
  Some theoretical results on V_ub and V_cb determinations from inclusive
decays of b hadrons are highlighted.


title:
Renormalizability and the model independent observables for abelian Z'
  search

abstract:
  The observables useful for the model independent search for signals of the
abelian Z' in the processes e^+ e^- \to {\bar f}f are introduced. They are
based on the renormalization group relations between the Z' couplings to the
Standard Model particles developed recently and extend the variables suggested
by Osland, Pankov and Paver. The bounds on the values of the observables at the
center-of-mass energy \sqrt{s} = 500GeV are derived.


title:
How Good are Present Analytical QCD-Predictions on Fluctuations in
  Angular Intervals ?

abstract:
  Results on two-particle angular correlations in jet cones and on multiplicity
fluctuations in one- and two- dimensional angular intervals, delivered by three
experiments (DELPHI, L3 and ZEUS, at $\sqrt{s}$ from few to 183 GeV) are
compared to present existing analytical QCD calculations, using the LPHD
hypothesis. Two different types of functions have been tested. While the
differentially normalized correlation functions show substantial deviations
from the predictions, a globally normalized correlation function agrees
surprisingly well. The role of the QCD parameters $\alpha_s$, $\Lambda$ and
$n_f$ is discussed. The necessity to include full energy-momentum conservation
into the analytical calculations is stressed.