title: Large-angle Bhabha scattering and luminosity at flavour factories

abstract:
  The luminosity determination of electron-positron colliders operating in the
region of low-lying hadronic resonances (E_cm ~ 1-10 GeV), such as BEPC/BES,
DAPHNE, KEKB, PEP-II and VEPP-2M, requires the precision calculation of the
Bhabha process at large scattering angles. In order to achieve a theoretical
accuracy at a few 0.1% level, the inclusion of radiative corrections is
mandatory. The phenomenologically relevant effect of QED corrections is taken
into account in the framework of the Parton Shower (PS) method, which is
employed both for cross section calculation and event generation. To test the
reliability of the approach, a benchmark calculation, including exact O(alpha)
corrections and higher-order leading logarithmic contributions, is developed as
well and compared in detail with the PS predictions. The effect of O(alpha)
next-to-leading and higher-order leading corrections is investigated in the
presence of realistic event selections for the Bhabha process at the
Phi-factories. A new Monte Carlo generator for data analysis (BABAYAGA) is
presented, with an estimated accuracy of 0.5%. Possible developments aiming at
improving its precision and range of applicability are discussed.


title: Three Remarks on the MSSM

abstract:
  First of all, "right" sneutrino can be the lightest supersymmetric particle.
Then, the flavor democracy favors large value of the tan^($beta$). Finally, the
huge number of free parameters in the three families MSSM may be considered as
an indication of SUSY at preonic level.


title: Q-ball collisions in the MSSM: gravity-mediated supersymmetry breaking

abstract:
  Collisions of non-topological solitons, Q-balls, are studied in a typical
potential in the Minimal Supersymmetric Standard Model where supersymmetry has
been broken by a gravitationally coupled hidden sector. Q-ball collisions are
studied numerically on a two dimensional lattice for a range of Q-ball charges.
Total cross-sections, as well as cross-sections for fusion and charge-exchange
are calculated. The average percentage increase in charge carried by the
largest Q-ball after a collision is found to be weakly dependent on the initial
charge.


title: Leptoquark signal from global analysis

abstract:
  Data from HERA, LEP and the Tevatron, as well as from low energy experiments
are used to constrain the Yukawa couplings for scalar and vector leptoquarks in
the Buchmuller-Ruckl-Wyler effective model. In the limit of very high
leptoquark masses constraints on the coupling to the mass ratio l/M are derived
using the contact-interaction approximation. For finite masses the coupling
limits are studied as a function of the leptoquark mass. Some leptoquark models
are found to describe the existing experimental data much better than the
Standard Model. Increase in the global probability observed for models
including S_1 or ~V_o leptoquark production/exchange corresponds to more than a
3 sigma effect. Assuming that a real leptoquark signal is observed, calculated
is an allowed region in the l-M plane. The leptoquark signal is mostly
resulting from the new data on the atomic parity violation in cesium, but is
also supported by recent LEP2 measurements, unitarity violation in the CKM
matrix and HERA high-Q^2 results.


title:
Neutralino Production with Polarized Beams in Extended Supersymmetric
  Models

abstract:
  We discuss associated neutralino production e^+ e^- --> \tilde{\chi}^0_1
\tilde{\chi}^0_2 with both beams polarized in the MSSM, NMSSM and an E_6 model.
It is shown that neutralinos with a large singlino component can be produced at
a high luminosity linear collider in a broad parameter range. Polarization
effects in the extended models are compared over the whole parameter space
where the lightest neutralino is mainly a singlino. We explain the complete
different behavior of these models in some parameter regions, which may help to
identify the respective supersymmetric model.


title: The ratio Phi->K+K-/K0K0bar

abstract:
  The ratio Phi->K+K-/K0K0bar is discussed and its present experimental value
is compared with theoretical expectations. A difference larger than two
standard deviations is observed. We critically examine a number of mechanisms
that could account for this discrepancy, which remains unexplained.
Measurements at DAPHNE at the level of the per mille accuracy can clarify
whether there exist any anomaly.


title:
Green's Function in Weak Interactions (in Matter) and Impossibility of
  Realizing the MSW Effect

abstract:
  It is shown that the equation for Green's function of fermions (neutrinos)
with weak interactions (in matter) coincides with the equation for Green's
function of fermions in vacuum. This result is a consequence of the fact that
the right components of fermions do not participate in weak interactions. As a
result we come to a conclusion: the mechanism of resonance enhancement of
neutrino oscillations in matter (i.e. MSW effect) cannot exist.


title: Electroweak Physics

abstract: We review the prospects for studies in electroweak physics at the LHC.


title: Could a Slepton be the Zee boson?

abstract:
  We study the feasibility of incorporating the popular Zee model for neutrino
mass in the framework of the supersymmetric standard model. While a singlet
slepton has the right quantum number to play the role of the Zee charged scalar
boson, the SUSY framework introduces extra contributions. We derive conditions
for the Zee contributions to dominate, hence retaining the flavor of the Zee
model.


title:
Order (alpha^2 Gamma, alpha^3 Gamma) Binding Effects in Orthopositronium
  Decay

abstract:
  We present a new, simplified analysis of the low-energy electron-positron
interaction, and use the resulting effective theory to calculate the binding
effects that contribute to the decay rate, Gamma, of orthopositronium, through
Order(alpha^3 ln(alpha) Gamma). We express the total decay rate in terms of the
annihilation rate for a free electron and positron at threshold, which has just
recently been computed to sufficient precision. Our result corrects errors in a
previous analysis.


title: Can the mirror world explain the ortho-positronium lifetime puzzle?

abstract:
  We suggest that the discrepant lifetime measurements of ortho-positronium can
be explained by ortho-positronium oscillations into mirror ortho-positronium.
This explanation can be tested in future vacuum experiments.


title: Parametric amplification with a friction in heavy ion collisions

abstract:
  We study the effects of the expansion of the system and the friction on the
parametric amplification of mesonic fields in high energy heavy ion collisions
within the linear $\sigma$ model . The equation of motion which is similar to
Mathieu equation is derived to describe the time development of classical
fields in the last stage of a heavy ion collision after the freezeout time. The
enhanced mode is extracted analytically by comparison with Mathieu equation and
the equation of motion is solved numerically to examine whether soft modes will
be enhanced or not. It is found that the strong peak appears around 267 MeV in
the pion transverse momentum distribution in cases with weak friction and high
maximum temperature. This enhancement can be extracted by taking the ratio
between different modes in the pion transverse momentum distribution.


title: Electroproduction of pseudoscalar mesons on the deuteron

abstract:
  A general analysis of polarization phenomena for coherent meson
electroproduction on deuterons, $e+ d\to e+ d +P^0$, where $P^0$ is a
pseudoscalar $\pi ^0$ or $\eta$-meson, is presented. The spin structure of the
electromagnetic current for $P^0$-production at threshold is parametrized in
terms of specific (inelastic) threshold electromagnetic form factors which
depend on the momentum transfer squared and the effective mass of the produced
hadronic system. We give expressions for the structure functions of the
reaction $e+\vec{d}\to e +d+ P^0$ (where the deuteron target is polarized) in
terms of these threshold form factors. The spin and isospin structures of the
$\gamma ^{*}+d\to d+P^0$ amplitudes (where $\gamma ^*$ is a virtual photon) is
established in the framework of the impulse approximation and relationships
between meson electroproduction on deuterons and on nucleons are given. The
reaction of $\pi^0$ electroproduction on deuterons is investigated in detail
both at threshold and in the region of $\Delta $-isobar excitation, using the
effective Lagrangian approach for the calculation of the amplitudes of the
elementary process $\gamma^*+N\to N+\pi$. Special attention is devoted to the
analysis of all standard contributions to the exclusive cross section for
$d(e,e\pi^0)d$, which are functions of the momentum transfer square, $k^2$, of
the excitation energy of the produced hadrons and of the pion production angle,
in a region of relatively large momentum transfer. The sensitivity of these
contributions to different parametrizations of the $\gamma^*\pi\omega$ form
factor as well as to the choice of $NN-$potential is discussed.


title: Neutrinoless double beta decay in four-neutrino models

abstract:
  The most stringent constraint on the so-called effective electron neutrino
mass from the present neutrinoless double beta decay experiments is |M_{ee}| <
0.2 eV, while the planned next generation experiment GENIUS is anticipated to
reach a considerably more stringent limit |M_{ee}|< 0.001 eV. We investigate
the constraints these bounds set on the neutrino masses and mixings of
neutrinos in four-neutrino models where there exists a sterile neutrino along
with the three ordinary neutrinos. We find that the GENIUS experiment would be
sensitive to the electron neutrino masses down to the limit m_{\nu_e}\lsim
0.024 eV in such a scenario.


title: Non-uniform chiral phase in effective chiral quark models

abstract:
  We analyze the phase diagram in effective chiral quark models (the
Nambu-Jona-Lasinio model, the sigma-model with quarks) and show that at the
mean-field level a phase with a periodically-modulated chiral fields separates
the usual phases with broken and restored chiral symmetry. A possible signal of
such a phase is the production of multipion jets travelling in opposite
directions, with individual pions having momenta of the order of several
hundred MeV. This signal can be interpreted in terms of disoriented chiral
condensates.


title:
The weak angle gamma from one-particle inclusive CP asymmetries in the
  B(s) system

abstract:
  We compute CP asymmetries of one-particle inclusive B(s) --> D(s) X decay
rates. We find that the weak angle gamma could in principle be extracted from
these asymmetries although they are very small. Taking the decay width
difference into account, we find that the time integrated CP asymmetries are of
the order A=1.4 10^(-4) sin(gamma). Some large uncertainties remain due to the
lack of experimental data.


title:
Neutrinoless double beta decay with and without Majoron-like boson
  emission in a 3-3-1 model

abstract:
  We consider the contributions to the neutrinoless double beta decays in a
$SU(3)_L\otimes U(1)_N$ electroweak model. We show that for a range of the
parameters in the model there are diagrams involving vector-vector-scalar and
trilinear scalar couplings which can be potentially as contributing as the
light massive Majorana neutrino exchange one. We use these contributions to
obtain constraints upon some mass scales of the model, like the masses of the
new charged vector and scalar bosons. We also consider briefly the decay in
which besides the two electrons a Majoron-like boson is emitted.


title: Possible Origin of Antimatter Regions in the Baryon Dominated Universe

abstract:
  We discuss the evolution of U(1) symmetric scalar field at the inflation
epoch with a pseudo Nambu-Goldstone tilt revealing after the end of exponential
expansion of the Universe. The U(1) symmetry is supposed to be associated with
baryon charge. It is shown that quantum fluctuations lead in natural way to
baryon dominated Universe with antibaryon excess regions. The range of
parameters is calculated at which the fraction of Universe occupied by
antimatter and the size of antimatter regions satisfy the observational
constraints, survive to the modern time and lead to effects, accessible to
experimental search for antimatter.


title:
Supersymmetric Extension of the Standard Model with Naturally Stable
  Proton

abstract:
  A new supersymmetric standard model based on N=1 supergravity is constructed,
aiming at natural explanation for the proton stability without invoking an ad
hoc discrete symmetry through R parity. The proton is protected from decay by
an extra U(1) gauge symmetry. Particle contents are necessarily increased to be
free from anomalies, making it possible to incorporate the superfields for
right-handed neutrinos and an SU(2)-singlet Higgs boson. The vacuum expectation
value of this Higgs boson, which induces spontaneous breakdown of the U(1)
symmetry, yields large Majorana masses for the right-handed neutrinos, leading
to small masses for the ordinary neutrinos. The linear coupling of
SU(2)-doublet Higgs superfields, which is indispensable to the superpotential
of the minimal supersymmetric standard model, is replaced by a trilinear
coupling of the Higgs superfields, so that there is no mass parameter in the
superpotential. The energy dependencies of the model parameters are studied,
showing that gauge symmetry breaking is induced by radiative corrections.
Certain ranges of the parameter values compatible with phenomena at the
electroweak energy scale can be derived from universal values of masses-squared
and trilinear coupling constants for scalar fields at a very high energy scale.


title: Quintessential Adjustment of the Cosmological Constant

abstract:
  We construct a time dependent adjustment mechanism for the cosmological
"constant" which could be at work in a late Friedmann-Robertson-Walker universe
dominated by quintessence and matter. It makes use of a Brans-Dicke field that
couples to the evolving standard-model vacuum energy density. Our explicit
model possesses a stable late-time solution with a fixed ratio of matter and
field energy densities. No fine tuning of model parameters or initial
conditions is required.


title: Flow equations in the light-front QCD: mass gap and confinement

abstract:
  The light-front QCD is studied using the method of flow equations. Solving
the light-front gluon gap equation, the effective gluon mass is generated
dynamically. The effective interaction between static quark and antiquark,
generated through elimination of the quark-gluon minimal coupling by flow
equations, has the Coulomb, $1/q^2$, and confining, $1/q^4$, singular behavior.
Elimination of the quark-gluon coupling at small gluon momenta is governed by
the cutoff dependent, dynamical gluon mass, which makes this elimination
possible and provides such an enhancement at $q\sim 0$. The cutoff, which
regulates small light-front $x$ divergences, sets up a scale for the dynamical
gluon mass and the string tension in the $q\bar{q}$-potential. The mechanism of
confimenemet in the light-front frame is suggested, based on the singular
nature of the light-front gauge along the light-front $x$-axis.


title: Flow Equations for Gluodynamics in the Coulomb Gauge

abstract:
  A systematic procedure to consistently formulate a field theoretical, QCD
bound state problem with a fixed number of constituents is outlined. The
approach entails applying the Hamiltonian flow equations, which are a set of
continuous unitary transformations, to a QCD motivated Hamiltonian with a
confining interaction. The method is developed in detail for gluodynamics in
the Coulomb gauge to obtain an effective block-diagonal Hamiltonian appropriate
to a reduced Fock space with fixed number of dynamical gluons. Standard
many-body techniques are used to numerically diagonalize this Hamiltonian in a
constituent two gluon Fock space. The calculated gluon condensates and glueball
masses are in good agreement with QCD sum rule and lattice results.


title: Gluino Condensation in an Interacting Instanton Ensemble

abstract:
  We perform a semi-classical study of chiral symmetry breaking and of the
spectrum of the Dirac operator in QCD with adjoint fermions. For this purpose
we calculate matrix elements of the adjoint Dirac operator between instanton
zero modes and study their symmetry properties. We present simulations of the
instanton ensemble for different numbers of Majorana fermions in the adjoint
representation. These simulations provide evidence that instantons lead to
gluino condensation in supersymmetric gluodynamics.


title: Pair production of neutralinos via gluon-gluon collisions

abstract:
  The production of a neutralino pair via gluon-gluon fusion is studied in the
minimal supersymmetric model(MSSM) at proton-proton colliders. The numerical
analysis of their production rates are carried out in the mSUGRA scenario. The
results show that this cross section may reach about 80 femto barn for
  $\tilde{\chi}^{0}_{1}\tilde{\chi}^{0}_{2}$ pair production and 23 femto barn
for $\tilde{\chi}^{0}_{2}\tilde{\chi}^{0}_{2}$ pair production with suitable
input parameters at the future LHC collider. It shows that this loop mediated
process can be competitive with the quark-antiquark annihilation process at the
LHC.


title: Neutralino pair production at proton-proton collider

abstract:
  In this paper we investigated the Drell-Yan process of the light neutralino
pair $\tilde{\chi}^0_{i}\tilde{\chi}^0_{j}~(i,j=1,2)$ productions at hadron
colliders. We studied the dependence of the coupling properties of two light
neutralino $\tilde{\chi}^0_{1,2}$ on the three SUSY Lagrangian parameters
$M_1$, $M_2$ and $\mu$, and find that the production rate of $\tilde{\chi}^0_1
\tilde{\chi}^0_2$ pair will be dominated by the Higgsino-like couplings under
the condition $\mu \ll M_2$ and $\mu \sim M_1$, while the productions of
$\tilde{\chi}^0_1\tilde{\chi}^0_1$ and $\tilde{\chi}^0_2\tilde{\chi}^0_2$ pairs
will be enhanced by the gaugino-like couplings under $M_i \ll \mu$. For the
Higgsino-like $\tilde{\chi}^0_{1,2}$ neutralinos, the cross section of
$\tilde{\chi}^0_1\tilde{\chi}^0_2$ production at the LHC can reach $100~fb$.


title: On the infrared behaviour of the (singlet) Higgs propagator

abstract:
  We present a simple semi-perturbative argument in favour of a peculiar
infrared behaviour of the (singlet) Higgs propagator. On the basis of
`triviality' one expects a continuum limit with a two-point function
$\Gamma_2(q) \to (q^2 + M^2_h)$. However, this is not valid in the limit $q \to
0$ where one actually finds a singular behaviour. This is in agreement with
both non-perturbative analyses of the effective potential and with lattice
computations of the propagator and of the zero-momentum susceptibility in the
broken phase. The singular behaviour persists in an O(N) continuous-symmetry
theory, the case first pointed out by Symanzik, and supports the existence of
an extremely weak $1/r$ potential that does not disappear when coupling the
scalar fields to gauge bosons.


title:
Signals of CP Violation in Distributions of Top-Quark Decay Products at
  Linear Colliders

abstract:
  Angular and energy distributions for leptons and bottom quarks in the process
e+e- --> t tbar --> l/b ... have been calculated assuming the most general
top-quark couplings. The double distributions depend both on modification of
the top-quark production and tbW decay vertices. However, the leptonic angular
distribution turned out to be insensitive to non-standard parts of tbW vertex.
The method of optimal observables have been used to estimate sensitivity of
future measurements at linear e+e- colliders


title: Hara Theorem, GIM model, and Asymmetry in Weak Radiative Hyperon Decays

abstract:
  It is shown that in the framework of GIM model,the parity-violating (PV)
$\Sigma^{+}(uus) \Rightarrow p(uud) + \gamma $ decay amplitude does not vanish
but just transforms into another PV decay amplitude, namely, of the
$\Omega^{+}_{cc}(ccs)\to \Xi^{+}_{cc}(ccd)+\gamma $ decay. The known result is
used that the relevant part of the CP-invariant effective current$\times$
current Hamiltonian changes sign under simultaneous quark changes
$d\leftrightarrow s$ and $u\leftrightarrow c$. So, asymmetry of $\Sigma^{+}
\Rightarrow p + \gamma $ decay should not vanish in contrast to the Hara result
of the old-fashioned $SU(3)_{f}$ model. At the same time, the zero asymmetry
prediction persists for the $ \Xi^{-} \Rightarrow \Sigma^{-} + \gamma $ decay.


title: Fermion masses in a model for spontaneous parity breaking

abstract:
  In this paper we discuss a left-right symmetric model for elementary
particles and their connection with the mass spectrum of elementary fermions.
The model is based on the group $SU(2)_L\otimes SU(2)_R\otimes U(1)$. New
mirror fermions and a minimal set of Higgs particles that breaks the symmetry
down to $U(1)_{em}$ are proposed. The model can accommodate a consistent
pattern for charged and neutral fermion masses as well as neutrino
oscillations. An important consequence of the model is that the connection
between the left and right sectors can be done by the neutral vector gauge
bosons Z and a new heavy Z'.


title:
Strong Coupling Constant from Scaling Violations in Fragmentation
  Functions

abstract:
  We present a new determination of the strong coupling constant alpha_s
through the scaling violations in the fragmentation functions for charged
pions, charged kaons, and protons. In our fit we include the latest e+e-
annihilation data from CERN LEP1 and SLAC SLC on the Z-boson resonance and
older, yet very precise data from SLAC PEP at center-of-mass energy sqrt(s)=29
GeV. A new world average of alpha_s is given.


title: Extending the Velocity-dependent One-scale String Evolution Model

abstract:
  We provide a general overview of the velocity-dependent one-scale model for
cosmic string evolution and discuss two further extensions to it. We introduce
and justify a new ansatz for the momentum parameter $k$, and also incorporate
the effect of radiation backreaction. We thus discuss the evolution of the
basic large-scale features of cosmic string networks in all relevant
cosmological scenarios, concentrating in particular on the `scaling' solutions
relevant for each case. In a companion paper, we show, by comparing with
numerical simulations, that this model provides an accurate description of the
large-scale features of cosmic string networks.


title: CP and T violation in neutrino oscillations

abstract:
  The conditions to induce appreciable CP-and T-odd effects in neutrino
oscillations are discussed. The propagation in matter leads to fake CP-and
CPT-odd asymmetries, besides a Bohm-Aharonov type modification of the
interference pattern. We study the separation of fake and genuine CP violation
by means of energy and distance dependence.


title: The relevance of $\gamma_L^*$ in hard collisions of virtual photons

abstract:
  We explore the relevance of extending the concept of the structure to the
longitudinally polarized virtual photon involved in hard collisions. We show
that for moderate photon virtualities and in the kinematical region accessible
in current experiments at HERA and LEP, the contributions of its longitudinal
polarization to hard collisions are sizable and should be taken into account as
part of the resolved photon component.


title: Day - Night Effect Predictions for the SNO Detector

abstract:
  Detailed predictions for the day-night (D-N) asymmetry in the
energy-integrated one year signals in the SNO detector in the case of the MSW
$\nu_e \to \nu_{\mu(\tau)}$ and/or $\nu_e \to \nu_s$ transition solutions of
the solar neutrino problem are presented. The asymmetries in the charged
current (CC) and $\nu - e^{-}$ elastic scattering (ES) event rates are
calculated for both MSW solutions; in the case of the $\nu_e \to \nu_s$
transition solution the D-N asymmetry in the neutral current (NC) event rate
are derived as well. The asymmetries are calculated for three night samples of
events which are produced by the solar neutrinos crossing i) the Earth mantle
only (Mantle), ii) the Earth core (Core) and iii) the Earth core and/or the
mantle (Night). The effects of the uncertainties, e.g., in the values of the
cross-sections of the CC and NC neutrino-induced reactions on deuterium on the
corresponding D-N asymmetry predictions are analyzed. It is shown, in
particular, that that due to the strong enhancement of the transitions of the
solar neutrinos crossing the Earth core, at $\sin^22\theta_V \leq 0.01$ the
corresponding one year average D-N asymmetry in the Core sample of CC events in
the case of the $\nu_e \to \nu_{\mu(\tau)}$ solution can be larger by a factor
of up to $\sim 8$ than the asymmetry in the Night sample. Iso - (D-N) asymmetry
contours in the $\Delta m^2 - \sin^22\theta_V$ plane for the SNO detector are
derived in the region $\sin^22\theta_V \gsim 10^{-4}$ for the Core and Night
samples of the CC, ES and NC events.


title: Deriving effective transport equations for non-Abelian plasmas

abstract:
  Within classical transport theory, an approach is presented to derive
systematically effective collision terms and noise sources for effective
kinetic equations of non-Abelian plasmas. This procedure amounts to the
`integrating-out' of fluctuations, and is applicable for in- and
out-of-equilibrium situations. When applied to a hot non-Abelian plasma close
to equilibrium we recover the collision integral and the noise source first
obtained by B\"odeker. It is also shown that our approach, and hence
B\"odeker's effective theory, is consistent with the fluctuation-dissipation
theorem.


title: A Model of Quark and Lepton Masses I: The Neutrino Sector

abstract:
  If neutrinos have masses, why are they so tiny? Are these masses of the Dirac
type or of the Majorana type? We are already familiar with the mechanism of how
to obtain a tiny Majorana neutrino mass by the famous see-saw mechanism. The
question is: Can one build a model in which a tiny Dirac neutrino mass arises
in a more or less "natural" way? What would be the phenomenological
consequences of such a scenario, other than just merely reproducing the
neutrino mass patterns for the oscillation data? In this article, a systematic
and detailed analysis of a model is presented, with, as key components, the
introduction of a family symmetry as well as a new SU(2) symmetry for the
right-handed neutrinos. In particular, in addition to the calculations of light
neutrino Dirac masses, interesting phenomenological implications of the model
will be presented.


title: Magnetic Moments of Decuplet Baryons in Light Cone QCD

abstract:
  We calculate the magnetic moments of decuplet baryons containing strange
quarks within the framework of light cone QCD sum rules taking into account the
SU(3) flavor symmetry breaking effects. It is obtained that magnetic moments of
the neutral $\sso$ and $\xis0$ baryons are mainly determined by the SU(3)
breaking terms. A comparison of our results on the magnetic moments of the
decuplet baryons with the predictions of other approaches is presented.


title: Neutrino-photon Scattering in a Magnetic Field

abstract:
  Previous calculations of photon-neutrino scattering in a constant background
magnetic field are extended and corrected.


title: Mini-review on Collider Signatures for Extra Dimensions

abstract:
  In this talk, I briefly review collider signatures for two models of extra
dimensions. The first one was proposed by Arkani-Hamed {\it et al.} that
gravity is free to propagate in extra dimensions of very large size ($\alt 1$
mm). Collider signatures for this model can be divided into two types: (i)
emission of real gravitons into extra dimensions, and (ii) exchanges of virtual
gravitons. The second model was proposed by Pomarol {\it et al.} and Dienes
{\it et al.} that the SM gauge bosons are allowed to propagate in extra
dimensions. Collider signatures for the second model are due to the existence
of the Kaluza-Klein (KK) states of $\gamma$, $W$, $Z$, and $g$ bosons.


title: Measurement of the gluon PDF at small x with neutrino telescopes

abstract:
  We analyze the possibility that neutrino telescopes may provide an
experimental determination of the slope lambda of the gluon distribution in the
proton at momentum fractions x smaller than the accelerator reach. The method
is based on a linear relation between lambda and the spectral index (slope) of
the down-going atmospheric muon flux above 100 TeV, for which there is no
background. Considering the uncertainties in the charm production cross section
and in the cosmic ray composition, we estimate the error on the measurement of
lambda through this method, excluding the experimental error of the telescopes,
to be ~ +/- 0.2


title: On decay of large amplitude bubble of disoriented chiral condensate

abstract:
  The time evolution of initially formed large amplitude bubble of disoriented
chiral condensate (DCC) is studied. It is found that the evolution of this
object may have a relatively long pre-decay stage. Simple explanation of such
delay of the DCC bubble decay is given. This delay is related to the existence
of the approximate solutions of multi-soliton type of the corresponding radial
sine-Gordon equation in (3+1) dimensions at large bubble radius.


title:
e^+ e^- --> {tilde t}_1 {tilde t}_1^* (H_1) in the MSSM with explicit CP
  violations

abstract:
  The author considers the effects of the CP-violating phases, e. g. arg(A_t)
and arg(mu) on the e^+ e^- --> {tilde t}_1 {tilde t}_1^* (H_1) processes. The
third generation squark trilinear terms give significant contributions to the
Higgs potential at the one-loop level. This results in the changes of the stop
masses and the lighter stop - the lighter anti-stop - the lightest Higgs
coupling. The author shows the coupling and the loop effects on the processes.
And the author will discuss the determination method of soft parameters.


title: CP Violation in the SM and Beyond in Hadronic B Decays

abstract:
  Three different methods, using $B_d\to J/\psi K_S$, $J/\psi K_S \pi^0$,
$B_d\to K^-\pi^+, \pi^+\pi^-$ and $B_u\to K^- \pi^0, \bar K^0 \pi^-,
\pi^-\pi^0$, to extract hadronic model independent information about new
physics are discussed in this talk.


title: Gravitational Decay Modes of the Standard Model Higgs Particle

abstract:
  If the Einstein field equations are employed at the tree level, then the
decay of the standard model Higgs particle into two gravitons is shown to be
independent of the gravitational coupling strength G. The result follows from
the physical equivalence between the Higgs induced ``inertial mass'' and the
``gravitational mass'' of general relativity. If the Higgs mass lies well
between the mass of a bottom quark anti-quark pair and the mass of a top quark
anti-quark pair, then the Higgs decay into two gravitons will dominate both the
QED induced two photon decay and the QCD induced two jet decays.


title: Baryogenesis vs. proton stability in theories with extra dimensions

abstract:
  We propose a new scenario of baryogenesis in the context of theories with
large extra dimensions. The baryon number is almost conserved at zero
temperature by means of a localization mechanism recently analyzed by
Arkani-Hamed and Schmaltz: leptons and quarks are located at two slightly
displaced positions in the extra space, and this naturally suppresses the
interactions which ``convert'' the latter in the former. We show that this is
expected to be no longer true when finite temperature effects are taken into
account. The whole scenario is first presented in its generality, without
referring to the bulk geometry or to the specific mechanism which may generate
the baryon asymmetry. As an example, we then focus on a baryogenesis model
reminiscent of GUT baryogenesis. The Sakharov out of equilibrium condition is
satisfied by assuming nonthermal production of the bosons that induce baryon
number violation.


title:
Radiative Corrections to the Hadronic Cross-Section Measurement at
  DAPHNE

abstract:
  The hadronic invariant mass distribution for the process of electron-positron
annihilation into a pair of charged pions accompanied by a photon radiated from
the initial state has been studied for the region of DA$\Phi$NE energies. The
Born cross-section and the electromagnetic radiative corrections to it are
calculated for realistic conditions of the KLOE detector. The dependence on the
physical parameters which define the event selection is obtained.


title: Bounds on extra quark-lepton generations from precision measurements

abstract:
  The existence of extra chiral generations is strongly disfavored by the
precision electroweak data if all the extra fermions are heavier than m_Z.
However fits as good as the SM can be obtained if one allows the new neutral
leptons to have masses close to 50 GeV. In the framework of SUSY models
precision measurements cannot exclude one additional generation of heavy
fermions if chargino and neutralino have masses around 60 GeV with delta_m
around 1 GeV.


title:
Bounds on "charginos nearly degenerate with the lightest neutralino"
  mass from precision measurements

abstract:
  Though LEP II direct searches still cannot exclude a chargino nearly
degenerate with the lightest neutralino if its mass is only slightly above half
of the Z boson mass and the sneutrino is light, it can be excluded indirectly
analyzing precision data. In this particular limit simple analytical formulas
for oblique electroweak radiative corrections are presented.


title: Indirect constraints on R-parity violating stop couplings

abstract:
  It was recently claimed that single stop production at the Tevatron,
occurring via R-parity (and baryon number) violating couplings, could lead to
observable signals. In this talk I present some results of a work in progress,
showing that rare B decays and K0-K0bar mixing strongly constrain such a
possibility.


title:
Nonequilibrium evolution and symmetry structure of the large-N $\Phi^4$
  model at finite temperature

abstract:
  We consider the large-N $\Phi^4$ theory with spontaneously broken symmetry at
finite temperature. We study, in the large-N limit, quantum states which are
characterized by a time dependent, spatially homogenous expectation value of
one of the field components, $\phi_N(t)$, and by quantum fluctuations of the
other $N-1$ components, that evolve in the background of the classical field.
Investigating such systems out of equilibrium has recently been shown to
display several interesting features. We extend here this type of
investigations to finite temperature systems. Essentially the novel features
observed at T=0 carry over to finite temperature. This is not unexpected, as
the main mechanisms that determine the late-time behavior remain the same. We
extend two empirical - presumably exact - relations for the late-time behavior
to finite temperature and use them to define the boundaries between the region
of different asymptotic regimes. This results in a phase diagram with the
temperature and the initial value of the classical field as parameters, the
phases being characterized by spontaneous symmetry breaking resp. symmetry
restoration. The time evolution is computed numerically and agrees very well
with the expectations.


title: Helicity Amplitudes for Single-Top Production

abstract:
  Single top quark production at hadron colliders allows a direct measurement
of the top quark charged current coupling. We present the complete tree-level
helicity amplitudes for four processes involving the production and
semileptonic decay of a single top quark: W-gluon fusion, flavor excitation,
s-channel production and W-associated production. For the first three processes
we study the quality of the narrow top width approximation. We also examine
momentum and angular distributions of some of the final state particles.


title: Charm Estimate from the Dilepton Spectra

abstract:
  A validity of a recent estimate of an upper limit of charm production in
central Pb+Pb collisions at 158 AGeV is critically discussed. Within a simple
model we study properties of the background subtraction procedure used for an
extraction of the charm signal from the analysis of dilepton spectra. We
demonstrate that a production asymmetry between positively and negatively
charged background muons and a large multiplicity of signal pairs leads to
biased results. Therefore the applicability of this procedure for the analysis
of nucleus-nucleus data should be reconsidered before final conclusions on the
upper limit estimate of charm production could be drawn.


title: The hadronic off-shell width of meson resonances

abstract:
  Within the resonance chiral effective theory we study the dressed propagators
of the spin-1 fields, as arise from a Dyson-Schwinger resummation
perturbatively constructed from loop diagrams with absorptive contributions in
the s-channel. We apply the procedure to the vector pion form factor and the
elastic pion-pion scattering to obtain the off-shell width of the rho_0 meson.
We adopt a definition of the off-shell width of spin-1 meson resonances that
satisfies the requirements of analyticity, unitarity, chiral symmetry and
asymptotic behaviour ruled by QCD. To fulfil these constraints the resummation
procedure cannot consist only of self-energy diagrams. Our width definition is
shown to be independent of the formulation used to describe the spin-1 meson
resonances.


title: Measuring gamma cleanly with CP-tagged Bs and Bd decays

abstract:
  We propose a new method for measuring the CKM phase gamma using the partial
rates for CP-tagged Bs decays. Such an experiment could be performed at a very
high luminosity symmetric e+e- collider operating at the Upsilon(5S) resonance,
where the Bs-Bsbar state is produced in a state of definite CP. We also discuss
CP-tagging in the Bd system at the Upsilon(4S), where a time-dependent analysis
is required to compensate for the anticipated large CP violation in Bd-Bdbar
mixing.


title: Neutrino survival probabilities in magnetic fields

abstract:
  We show that, for Majorana neutrinos propagating in a constant magnetic
field, the flavour survival probabilities for left-handed neutrinos is the same
as for right-handed neutrinos, i.e., $P^M (\nu_{\alpha L}\to\nu_{\alpha L}) =
  P^M (\nu_{\alpha R}\to\nu_{\alpha R})$, where $\alpha = e, \mu, \tau$,
whereas in the Dirac case the corresponding probabilities $P^D (\nu_{\alpha
L}\to\nu_{\alpha L})$ and $P^D (\bar\nu_{\alpha R}\to\bar\nu_{\alpha R})$ are
in general different. This might lead to a novel way to search for the nature
of neutrinos. We also discuss how this relation for Majorana neutrinos gets
modified when the magnetic field is not constant. However, if matter effects
become important the relation does not hold anymore.


title:
Constraints on the CKM Angle $\gamma$ and Strong Phases from $B\to\pi K$
  Decays

abstract:
  As we pointed out recently, the neutral decays $B_d\to\pi^\mp K^\pm$ and
$B_d\to\pi^0K$ may provide non-trivial bounds on the CKM angle $\gamma$. In
this paper, we reconsider this approach in the light of recent CLEO data, which
look very interesting. In particular, the results for the corresponding
CP-averaged branching ratios are in favour of strong constraints on $\gamma$,
where the second quadrant is preferred. Such a situation would be in conflict
with the standard analysis of the unitarity triangle. Moreover, constraints on
a CP-conserving strong phase $\delta_n$ are in favour of a negative value of
$\cos\delta_n$, which would be in conflict with the factorization expectation.
In addition, there seems to be an interesting discrepancy with the bounds that
are implied by the charged $B\to\pi K$ system: whereas these decays favour a
range for $\gamma$ that is similar to that of the neutral modes, they point
towards a positive value of $\cos\delta_c$, which would be in conflict with the
expectation of equal signs for $\cos\delta_n$ and $\cos\delta_c$. If future
data should confirm this ``puzzle'', it may be an indication for new-physics
contributions to the electroweak penguin sector, or a manifestation of large
non-factorizable SU(3)-breaking effects.


title:
Polarized antiquark distributions from chiral quark-soliton model:
  summary of the results

abstract:
  In these short notes we present a parametrization of the results obtained in
the chiral quark-soliton model for polarized antiquark distributions
$\Delta\bar u$, $\Delta\bar d$ and $\Delta\bar s$ at a low normalization point
around mu=0.6 GeV.


title: The Lambda_b lifetime in the light front quark model

abstract:
  The enhancement of the Lambda_b decay width relative to B decay one due to
the difference of Fermi motion effects in Lambda_b and B is calculated in the
light--front quark model with the simplifying assumption that Lambda_b consists
of the heavy quark and light scalar diquark. In order to explain the large
deviation from unity in the experimental result for tau(Lambda_b)/tau(B), it is
necessary that diquark be light and the ratio of the squares of the Lambda_b
and B wave functions at the origin be \le 1.


title: Landau-Pomeranchuk-Migdal effect in thermal field theory

abstract:
  In recent studies, the production rate of photons or lepton pairs by a quark
gluon plasma has been found to be enhanced due to collinear singularities. This
enhancement pattern is very dependent on rather strict collinearity conditions
between the photon and the quark momenta. It was estimated by neglecting the
collisional width of quasi-particles. In this paper, we study the modifications
of this collinear enhancement when we take into account the possibility for the
quarks to have a finite mean free path. Assuming a mean free path of order
$(g^2T\ln(1/g))^{-1}$, we find that only low invariant mass photons are
affected. The region where collision effects are important can be interpreted
as the region where the Landau-Pomeranchuk-Migdal effect plays a role in
thermal photon production by bremsstrahlung. It is found that this effect
modifies the spectrum of very energetic photons as well. Based on these results
and on a previous work on infrared singularities, we end this paper by a
reasonable physical picture for photon production by a quark gluon plasma, that
should be useful to set directions for future technical developments.


title:
Diquark composites in the color superconducting phase of two flavor
  dense QCD

abstract:
  We study the Bethe-Salpeter equations for spin zero diquark composites in the
color superconducting phase of N_f=2 cold dense QCD. The explicit form of the
spectrum of the diquarks, containing an infinite tower of narrow (at high
density) resonances, is derived. It is argued that there are five
pseudo-Nambu-Goldstone bosons (pseudoscalars) that remain almost massless at
large chemical potential. These five pseudoscalars, along with the massless
quarks of the third color should play an important role in the infrared
dynamics of N_f=2 dense QCD.


title: Cosmology of Brane-Bulk Models in Five Dimensions

abstract:
  We study the cosmology of models with four space and one time dimension where
our universe is a 3-brane and report a few results which extend existing work
in several directions. Assuming a stable fifth dimension, we obtain a solution
for the metric, which does not depend on any arbitrary parameters. We discuss
some implications of this result.


title:
Frame-Independence of Exclusive Amplitudes in the Light-Front
  Quantization

abstract:
  While the particle-number-conserving convolution formalism established in the
Drell-Yan-West reference frame is frequently used to compute exclusive
amplitudes in the light-front quantization, this formalism is limited to only
those frames where the light-front helicities are not changed and the good
(plus) component of the current remains unmixed. For an explicit demonstration
of such criteria, we present the relations between the current matrix elements
in the two typical reference frames used for calculations of the exclusive
amplitudes, i.e. the Drell-Yan-West and Breit frames and investigate both
pseudoscalar and vector electromagnetic currents in detail. We find that the
light-front helicities are unchanged and the good component of the current does
not mix with the other components of the current under the transformation
between these two frames. Thus, the pseudoscalar and vector form factors
obtained by the diagonal convolution formalism in both frames must indeed be
identical. However, such coincidence between the Drell-Yan-West and Breit
frames does not hold in general. We give an explicit example in which the
light-front helicities are changed and the plus component of the current is
mixed with other components under the change of reference frame. In such a
case, the relationship between the frames should be carefully analyzed before
the established convolution formalism in the Drell-Yan-West frame is used.


title:
The Reach of the CERN Large Hadron Collider for Gauge-Mediated
  Supersymmetry Breaking Models

abstract:
  We examine signals for sparticle production at the CERN Large Hadron Collider
(LHC) within the framework of gauge mediated supersymmetry breaking models with
a low SUSY breaking scale for four different model lines, each of which leads
to qualitatively different signatures. We first examine the reach of the LHC
via the canonical E_T^miss and multilepton channels that have been advocated
within the mSUGRA framework. Next, we examine special features of each of these
model lines that could serve to further enhance the SUSY signal over Standard
Model backgrounds. We use ISAJET to evaluate the SUSY reach of experiments at
the LHC. We find that the SUSY reach, measured in terms of m(gluino), is at
least as large, and sometimes larger, than in the mSUGRA framework. In the best
case of the co-NLSP scenario, the reach extends to m(gluino) >~ 3 TeV, assuming
10 fb^-1 of integrated luminosity.


title: Spectators effect in inclusive beauty decays

abstract:
  I review the role of the spectator quarks effect in the inclusive beauty
decays. The evaluation of the expectation values of four-quark operators
between hadronic states and its consequences are discussed.


title:
Quasirotational Motions and Stability Problem in Dynamics of String
  Hadron Models

abstract:
  For the relativistic string with massive ends (the meson model) and four
various string baryon models (q-qq, q-q-q, Y and $\Delta$) we consider the
classical quasirotational motions, which are small disturbances of the planar
uniform rotations of these systems. For the string meson model the two types of
these solutions are obtained. They describe oscillatory motions in the form of
stationary waves in the rotational plane and in the orthogonal direction. This
approach and the suggested method of determining an arbitrary motion of the
system on the base of initial data let us solve the stability problem for the
rotational motions for all mentioned string configurations. It is shown that
the classic rotational motions are {\it stable} for the string meson model (or
its analog q-qq) and for the $\Delta$ baryon configuration, but they are {\it
unstable} for the string baryon models Y and q-q-q. For the latter two systems
any small asymmetric disturbances grow with growing time. The motion of the
q-q-q configuration become more complicated and quasiperiodic but quarks do not
merge. In the case of Y model the evolution of disturbances results in falling
a quark into the junction. These features of the classic behavior are important
for describing the hadron states on the Regge trajectories and for choosing and
developing the most adequate QCD-based string hadron models.


title: Fat penguins and imaginary penguins in perturbative QCD

abstract:
  We evaluate $B\to K\pi$ decay amplitudes in perturbative QCD picture. It is
found that penguin contributions are dynamically enhanced by nearly 50%
compared to those assumed in the factorization approximation. It is also shown
that annihilation diagrams are not negligible, and give large strong phases.
Our results for branching ratios of $B\to K\pi$ decays for a representative
parameter set are consistent with data. We evaluate $B\to K\pi$ decay
amplitudes in perturbative QCD picture. It is found that penguin contributions
are dynamically enhanced by nearly 50% compared to those assumed in the
factorization approximation. It is also shown that annihilation diagrams are
not negligible, and give large strong phases. Our results for branching ratios
of $B\to K\pi$ decays for a representative parameter set are consistent with
data.


title: Production of CP-even and CP-odd Higgs bosons at Muon colliders

abstract:
  In the $s$-channel Higgs-boson-exchange processes, the interference between
the amplitudes for CP-even and CP-odd Higgs bosons is sizable, if the
helicities of initial and final particles are properly fixed and if the mass
difference between these bosons is not much larger than their decay widths. We
discuss this interference effect in the process $\mu^+ \mu^-$ $\to t\bar{t}$.
Examining the effects gives us information on CP-parity for Higgs bosons and on
the sign of a product of the coupling constants for $H\mu^-\mu^+$, $Ht\bar{t}$,
$A\mu^-\mu^+$ and $At\bar{t}$ vertices. The feasibility of observing the
interference effect in future muon colliders is evaluated in the framework of
the minimal supersymmetric extension of the standard model as an example.


title: Variable number schemes for heavy quark electroproduction

abstract: We compare variable number schemes for heavy quark electroproduction


title: Extrapolating SU(3) breaking effects from D to B decays

abstract:
  We consider two SU(3) breaking parameters, $R_1(m_B)$ and $R_2(m_B)$,
appearing in a relation between $B^+\to K\pi$ and $B^+\to\pi\pi$ amplitudes,
which plays an important role in determining the weak phase $\gamma$. We
identify an isospin-related quantity $R_2(m_D)$ measured in $D$ decays,
exhibiting large SU(3) breaking which is likely due to nonfactorizable effects.
With a cautious remark about possible nonfactorizable SU(3) breaking in $B$
decays, we proceed to calculate factorizable SU(3) breaking corrections.
Applying heavy quark symmetry to semileptonic $D$ and B decay form factors, we
find that SU(3) breaking in $R_2(m_B)/R_1(m_B)$ may be significantly larger
than estimated from certain model calculations of form factors.


title:
NLO corrections to the BFKL equation in QCD and in supersymmetric gauge
  theories

abstract:
  We study next-to-leading corrections to the integral kernel of the BFKL
equation for high energy cross-sections in QCD and in supersymmetric gauge
theories. The eigenvalue of the BFKL kernel is calculated in an analytic form
as a function of the anomalous dimension \gamma of the local gauge-invariant
operators and their conformal spin n. For the case of an extended N=4 SUSY the
kernel is significantly simplified. In particular, the terms non-analytic in n
are canceled. We discuss the relation between the DGLAP and BFKL equations in
the N=4 model.


title: QCD Working Group Report

abstract:
  This is the report of the QCD working group at WHEPP 6. Discussions and work
on heavy ion collisions, polarised scattering, and collider phenomenology are
reported.


title: Exploring CP Violation with $B_c$ Decays

abstract:
  We point out that the pure ``tree'' decays $B_c^\pm\to D^\pm_s D$ are
particularly well suited to extract the CKM angle $\gamma$ through amplitude
relations. In contrast to conceptually similar strategies using $B^\pm\to K^\pm
D$ or $B_d\to K^{\ast0} D$ decays, the advantage of the $B_c$ approach is that
the corresponding triangles have three sides of comparable length and do not
involve small amplitudes. Decays of the type $B_c^\pm\to D^\pm D$ -- the
$U$-spin counterparts of $B_c^\pm\to D^\pm_s D$ -- can be added to the
analysis, as well as channels, where the $D^\pm_s$- and $D^\pm$-mesons are
replaced by higher resonances.


title: The electric dipole moment of the neutron in chiral perturbation theory

abstract:
  We calculate the electric dipole moments of the neutron and the Lambda within
the framework of heavy baryon chiral perturbation theory. They are induced by
strong CP-violating terms of the effective Lagrangian in the presence of the
vacuum angle theta_0. The construction of such a Lagrangian is outlined and we
are able to give an estimate for theta_0.


title: Off-forward parton distributions and Shuvaev's transformations

abstract:
  We review Shuvaev's transformations, that relate off-forward parton
distributions (OFPDs) to so-called effective forward parton distributions
(EFPDs). The latter evolve like conventional forward partons. We express
nonforward amplitudes, depending on OFPDs, directly in terms of EFPDs and
construct a model for the EFPDs, which allows to consistently express them in
terms of the conventional forward parton distributions and nucleon form
factors. Our model is self-consistent for arbitrary x, xi, mu, and t.


title:
An automatized algorithm to compute infrared divergent multi-loop
  integrals

abstract:
  We describe a constructive procedure to separate overlapping infrared
divergences in multi-loop integrals. Working with a parametric representation
in D=4-2*epsilon dimensions, adequate subtractions lead to a Laurent series in
epsilon, where the coefficients of the pole- and finite terms are sums of
regular parameter integrals which can be evaluated numerically. We fully
automatized this algorithm by implementing it into algebraic manipulation
programs and applied it to calculate numerically some nontrivial 2-loop 4-point
and 3-loop 3-point Feynman diagrams. Finally, we discuss the applicability of
our method to phenomenologically relevant multi--loop calculations such as the
NNLO QCD corrections for e^+e^- --> 3 jets.


title:
Relating different approaches to nonlinear QCD evolution at finite gluon
  density

abstract:
  We analyze the relation between evolution equations at low x that have been
derived in different approaches in the last several years. We show that the
equation derived by Balitsky and Kovchegov is obtained from the
Jalilian-Marian-Kovner-Leonidov-Weigert (JKLW) equation in the limit of small
induced charge density. We argue that the higher nonlinearities resummed by the
JKLW equation correspond, in physical terms, to the breakdown of the eikonal
approximation when the gluon fields in the target are large.


title: Higgs Boson Searches at LEP Up To sqrt(s) = 202 GeV

abstract:
  The latest preliminary combined results of the Higgs boson searches from the
LEP experiments ALEPH, DELPHI, L3 and OPAL are presented. A general scan of the
MSSM parameters is performed and leads to stringent lower mass limits and for
the first time excludes low tan(beta) values.


title: Free Energy of a Hot Quark-Gluon Plasma

abstract:
  Thermal (Th-)QCD properties appear to disagree with lattice (L-)QCD results,
which suggests that Th-QCD does not have a valid perturbative expansion.
However, we reproduce L-QCD using the first order $\alpha_s$ corrections in
Th-QCD.


title: Angular Distributions in Higgs Decays

abstract:
  A new theory yields unconventional results for the angular distribution of
products like $b-\bar{b}$ jets in Higgs decays.


title: Logarithms of alpha in QED bound states from the renormalization group

abstract:
  The velocity renormalization group is used to determine ln(alpha)
contributions to QED bound state energies. The leading order anomalous
dimension for the potential gives the alpha^5 ln(alpha) Bethe logarithm in the
Lamb shift. The next-to-leading order anomalous dimension determines the
alpha^6 ln(alpha), alpha^7 ln^2(alpha), and alpha^8 ln^3 (alpha) corrections to
the energy. These are used to obtain the alpha^8 ln^3(alpha) Lamb shift and
alpha^7 ln^2(alpha) hyperfine splitting for Hydrogen, muonium and positronium,
as well as the alpha^2 ln(alpha) and alpha^3 ln^2(alpha) corrections to the
ortho- and para-positronium lifetimes.


title: 5-10 GeV Neutrinos from Gamma-Ray Burst Fireballs

abstract:
  A gamma-ray burst fireball is likely to contain an admixture of neutrons, in
addition to protons, in essentially all progenitor scenarios. Inelastic
collisions between differentially streaming protons and neutrons in the
fireball produce muon neutrinos (antineutrinos) of ~ 10 GeV as well as electron
neutrinos (antineutrinos) of ~ 5 GeV, which could produce ~ 7 events/year in
kilometer cube detectors, if the neutron abundance is comparable to that of
protons. Photons of ~ 10 GeV from pi-zero decay and ~ 100 MeV electron
antineutrinos from neutron decay are also produced, but will be difficult to
detect. Photons with energies < 1 MeV from shocks following neutron decay
produce a characteristic signal which may be distinguishable from the
proton-related MeV photons.


title: Neutrino Masses and Leptonic CP Violation

abstract:
  Neutrino oscillations as solutions of the solar neutrino problems and the
atmospheric neutrino deficits may restrict neutrino mass squared differences
and mixing angles in three-neutrino mixing scheme. Currently we have several
solutions depending on the interpretations of the solar neutrino problems.
Combining the neutrino oscillation solutions and a mass matrix ansatz, we
investigated the neutrino mass bounds and found possible leptonic CP-violating
rephasing-invariant quantity $J^{l}_{\tiny CP} \leq 0.012$ for large mixing
angle MSW and just-so vacuum oscillations solutions, and $J^{l}_{\tiny CP} \leq
0.0013$ for small mixing angle MSW solution.


title: Strong coupling constant from bottomonium fine structure

abstract:
  From a fit to the experimental data on the $b\bar{b}$ fine structure, the
two-loop coupling constant is extracted. For the 1P state the fitted value is
$\alpha_s(\mu_1) = 0.33 \pm 0.01(exp)\pm 0.02 (th)$ at the scale $\mu_1 = 1.8
\pm 0.1$ GeV, which corresponds to the QCD constant $\Lambda^{(4)}(2-loop) =
338 \pm 30$ MeV (n_f = 4) and $\alpha_s(M_Z) = 0.119 \pm 0.002. For the 2P
state the value $\alpha_s(\mu_2) = 0.40 \pm 0.02(exp)\pm 0.02(th)$ at the scale
$\mu_2 = 1.02 \pm 0.2$ GeV is extracted, which is significantly larger than in
the previous analysis of Fulcher (1991) and Halzen (1993), but about 30%
smaller than the value given by standard perturbation theory. This value
$\alpha_s(1.0) \approx 0.40$ can be obtained in the framework of the background
perturbation theory, thus demonstrating the freezing of $\alpha_s$. The
relativistic corrections to $\alpha_s$ are found to be about 15%.


title: A perturbative treatment of double gluon exchange in gamma*-proton DIS

abstract:
  A new model for the exchange of two gluons between the virtual photon and the
proton, in non-diffractive deeply inelastic electron-proton scattering, is
developed and studied. This model relies on a perturbative calculation,
previously applied to diffraction, and a general result from Regge theory. As a
first application of the model, we study corrections to the momentum transfer
to the quark-anti-quark pair, at the photon-vertex. We find a significant
enhancement of the cross-section at ~Q^2 momentum transfers, and large negative
corrections for small momentum transfers. The implication of this result for
jet-distributions measured at HERA, is discussed.


title: Large Quark Rotations, Neutrino mixing and Proton Decay

abstract:
  Right-handed (RH) rotations do not play a role in the Standard Model, and
only the differences of the LH mixing angles are involved in ${\bf V}_{\scr
\textrm{CKM}}$. This leads to the huge freedom in the fermionic mass matrices.
However, that is no more true in extensions of the Standard Model. For example
in GUTs large RH rotations of the quarks can be related to the observed large
neutrino mixing or in particular, all mixing angles are relevant for the proton
decay. We present a simple realistic non-SUSY SO(10) GUT with large RH and LH
mixing and study the corresponding nucleon decay rates.


title: Inflation After Preheating

abstract:
  Preheating after inflation may lead to nonthermal phase transitions with
symmetry restoration. These phase transitions may occur even if the total
energy density of fluctuations produced during reheating is relatively small as
compared with the vacuum energy in the state with restored symmetry. As a
result, in some inflationary models one encounters a secondary, nonthermal
stage of inflation due to symmetry restoration after preheating. We review the
theory of nonthermal phase transitions and make a prediction about the
expansion factor during the secondary inflationary stage. We then present the
results of lattice simulations which verify these predictions, and discuss
possible implications of our results for the theory of formation of topological
defects during nonthermal phase transitions.


title:
$\mu \to e \gamma$ and $\mu \to 3e$ Processes with Polarized Muon and
  Supersymmetric Grand Unified Theories

abstract:
  Lepton flavor violating processes $\mu \to e \gamma$ and $\mu \to 3e$ with
polarized muons are studied in the supersymmetric grand unified theory (SUSY
GUT). As a result of a detailed numerical calculation, it is shown that the P-
and T-odd asymmetries defined with the help of the muon polarization and the
ratio of two branching fractions make a good contrast between the SU(5) and
SO(10) SUSY GUT. These observables are useful to extract differences of the two
theories. In particular, the P-odd asymmetry of $\mu \to e \gamma$ varies
100%--100% in SO(10) whereas it is 100% in SU(5) and the T-odd asymmetry of
$\mu \to 3e$ can reach 15% in SU(5) within the EDM constraints whereas it is
small in SO(10).


title: Top quark pair production near the threshold in e+e- collisions

abstract:
  It was reported that the NNLO correction to the total cross section near the
ttbar threshold in e+e- collisions is as large as the NLO correction to it. In
the thesis, we improve the convergence of the perturbative series of the total
cross section by choosing appropriate expansion parameters for both m_t and
alpha_s. With these two prescriptions, the perturbative convergence is much
improved. Correspondingly, the resulting ambiguity for the determination of m_t
is estimated to be 0.1GeV.
  We also study the effect of all types of anomalous top-quark EDM interactions
near the threshold for the first time. We show that one can disentangle these
EDMs by the dependence of CP-odd observables on the CM-energy and on the degree
of initial state polarization. The sensitivity to chromo-EDM at LC turns out to
be better than that at LC in the open top region, but to be worse than that at
LHC by a factor 1/10. The sensitivities to electroweak-EDMs near the threshold
are similar to those in the open top region at LC.


title: QCD analysis of near-to-planar 3-jet events

abstract:
  Perturbative QCD analysis is presented of the cumulative out-of-plane
momentum distribution in the near-to-planar e+e- annihilation events, K_out <<
Q. In this kinematical region multiple gluon radiation effects become
essential. They are resummed with the single-logarithmic accuracy, which
programme includes the 2-loop treatment of the basic radiation and matching
with the exact O(alpha_s^2) result.
  Dedicated experimental analyses of 3-jet event characteristics are of special
interest for the study of the non-perturbative confinement effects.


title: Yukawa Unification, b --> s gamma and Bino-Stau Coannihilation

abstract:
  The minimal supersymmetric standard model with universal boundary conditions
and "asymptotic" Yukawa unification is considered. The full one-loop effective
potential for radiative electroweak symmetry breaking as well as the one-loop
corrections to the charged Higgs boson, b-quark and tau lepton masses are
included. The CP-even Higgs boson masses are corrected to two-loops. The relic
abundance of the lightest supersymmetric particle (bino) is calculated by
including its coannihilations with the next-to-lightest supersymmetric particle
(lightest stau) consistently with Yukawa unification. The branching ratio of b
--> s gamma is evaluated by incorporating all the applicable next-to-leading
order QCD corrections. The bino-stau coannihilations reduce the bino relic
abundance below the upper bound from cold dark matter considerations in a
sizable fraction of the parameter space allowed by b --> s gamma for mu>0.
Thus, the mu>0 case, which also predicts an acceptable b-quark mass, is
perfectly compatible with data.


title:
Effect of the Charm Quark Mass on the BFKL gamma^* gamma^* Total Cross
  Section at LEP

abstract:
  We perform a numerical study of various improvements of the LO BFKL
prediction for the gamma^* gamma^* total cross section in the kinematical
region of the L3 detector at LEP. In particular, we study the effects of a
massive charm quark and of different photon polarizations. The variation of the
BFKL prediction under changes of alpha_s is investigated.


title:
How to Integrate Divergent Integrals: a Pure Numerical Approach to
  Complex Loop Calculations

abstract:
  Loop calculations involve the evaluation of divergent integrals.
  Usually [1] one computes them in a number of dimensions different than four
where the integral is convergent and then one performs the analytical
continuation and considers the Laurent expansion in powers of epsilon =n-4. In
this paper we discuss a method to extract directly all coefficients of this
expansion by means of concrete and well defined integrals in a five dimensional
space. We by-pass the formal and symbolic procedure of analytic continuation;
instead we can numerically compute the integrals to extract directly both the
coefficient of the pole 1/epsilon and the finite part.


title: SO(10) theory of R-parity and neutrino mass

abstract:
  We study the Higgs sector of a SO(10) grand unified theory which predicts
exact conservation of R-parity at all scales and incorporates the see-saw
mechanism. We find possible intermediate scales and light states compatible
with the constraints coming from the running of the gauge couplings. Such a
pattern could lower the SO(10) breaking scale, allowing the d=6 proton decay
operators to be comparable in magnitude to the d=5 ones.


title: Neutrino Oscillations and Cosmology

abstract:
  Phenomenology of neutrino oscillations in vacuum and in cosmological plasma
is considered. Neutrino oscillations in vacuum are usually described in plane
wave approximation. In this formalism there is an ambiguity if one should
assume $\delta p =0$ and correspondingly $\delta E\neq 0$ or vice versa $\delta
E =0$ and $\delta p \neq 0$, or some other condition. We will use the standard
set of quantum field theory rules and show that the theoretical description is
unambiguous and that the state of oscillating neutrinos is determined by the
conditions of their registration. The wave packet formalism is a natural result
of such an approach. Oscillating neutrinos in cosmological plasma cannot be
described in terms of wave function because of a fast loss of coherence due to
elastic or inelastic scattering, so that one should use the density matrix
formalism. Kinetic equations for the density matrix of oscillating neutrinos
are derived. Numerical and semi-analytical solutions of the equations are
examined. In particular, a possibility of amplification of cosmological lepton
asymmetry in the sector of active neutrinos mixed to sterile ones is critically
discussed.


title: Heavy Quark Impact Factor at Next-to-leading Level

abstract:
  We further analyze the definition and the calculation of the heavy quark
impact factor at next-to-leading (NL) log(s) level, and we provide its
analytical expression in a previously proposed k-factorization scheme. Our
results indicate that k-factorization holds at NL level with a properly chosen
energy scale, and with the same gluonic Green's function previously found in
the massless probe case.


title:
Measuring the relative CP-even and CP-odd Yukawa couplings of a Higgs
  boson at a muon-collider Higgs factory

abstract:
  We study a possibility of a measurement of muon Yukawa couplings in s-channel
Higgs boson production at a muon collider with transversely polarized beams. We
investigate sensitivity to the relative size of the CP-odd and CP-even muon
Yukawa couplings. Provided the event rate observed justify the operation of the
$\mu^+\mu^-$ Higgs boson factory, we have found that polarization degree 40% is
sufficient to resolve the CP nature of a single resonance as well as
disentangle it from two overlapping CP conserving resonances.


title: Thermalization After Inflation and Reheating Temperature

abstract:
  We present a detailed examination of thermalization after inflation for
perturbative inflaton decay. Different interactions among particles in the
plasma of inflaton decay products are considered and it will be shown that 2 ->
2 scatterings and particle decay are the important ones. We show that
thermalization occurs after decays dominate scatterings, and that depending on
the typical mass scale of inflaton decay products, different situations may
arise. In particular, thermalization may be delayed until late times, in which
case the bounds from thermal gravitino production on supersymmetric models of
inflation are considerably relaxed. We will also consider the case where the
observable sector consists only of the MSSM matter content, and point out that
flat directions with large vevs may result in earlier thermalization of the
plasma and push the reheat temperature towards its upper limit.


title: A New Approach to Texture Analysis of Quark Mass Matrices

abstract:
  The triangular basis is proposed as an efficient way of analyzing general
quark mass matrices. Applying the method to hermitian hierarchical matrices
with five texture zeros, analytic predictions for quark mixing can be readily
obtained. One unique texture pair is found most favorable with present data.
Some remarks are also made concerning parallel textures between the up and down
quark mass matrices with four zeros.


title: About the Mixing and CP Violation in Neutrino System

abstract:
  Suppose the geometrical explaination to the weak CP phase in quark sector is
also valid for neutrinos, the mixing and CP violation in neutrino system are
discussed. We find a larger $J_{CP}$ than $3\times 10^{-3}$ implys the
large-mixing solution for solar neutrino problem. In case of bi-maximal mixing,
we predict relative large CP violation with $J_{CP}$ larger than $10^{-3}$ in
neutrino system, except the third mixing angle approachs to 0 or $\pi/2$ very
closely.


title:
Renormalizability and model independent description of Z' signals at low
  energies

abstract:
  Model independent search for signals of heavy Z' gauge bosons in low-energy
four-fermion processes is analyzed. It is shown that the renormalizability of
the underlying theory containing Z', formulated as a scattering in the field of
heavy virtual states, can be implemented in specific relations between
different processes. Considering the two-Higgs-doublet model as the low-energy
basis theory, the two types of Z' interactions with light particles are found
to be compatible with the renormalizability. They are called the Abelian and
the "chiral" couplings. Observables giving possibility to uniquely detect Z' in
both cases are introduced.


title: A consistent nonperturbative approach to thermal damping-rates

abstract:
  We propose a nonperturbative scheme for the calculation of thermal
damping-rates using exact renormalization group (RG)-equations. Special
emphasis is put on the thermal RG where first results for the rate were given
in M. Pietroni, Phys. Rev. Lett. 81 (1998), 2424. We point out that in order to
obtain a complete result that also reproduces the known perturbative behaviour
one has to take into account effects that were neglected in the work cited
above. We propose a well-defined way of doing the calculations that reproduces
perturbation theory in lowest order but goes considerably beyond perturbative
results and should be applicable also at second order phase-transitions.


title: The gauge invariant quark correlator in QCD sum rules and lattice QCD

abstract:
  Taking the gauge invariant quark correlator as an example, in this work we
perform a direct comparison of lattice QCD simulations with the QCD sum rule
approach. The quark correlator is first investigated in the framework of QCD
sum rules and the correlation length of the quark field is calculated.
Comparing the phenomenological part of the sum rule with previous measurements
of the quark correlator on the lattice, we are able to obtain an independent
result for the correlation length. From a fit of the lattice data to the
operator product expansion, the quark condensate and the mixed quark-gluon
condensate can be extracted.


title: B_c Meson Production in Nuclear Collisions at RHIC

abstract:
  We study quantitatively the formation and evolution of B_c bound states in a
space-time domain of deconfined quarks and gluons (quark-gluon plasma, QGP). At
the Relativistic Heavy Ion Collider (RHIC) one expects for the first time that
typical central collisions will result in multiple pairs of heavy (in this case
charmed) quarks. This provides a new mechanism for the formation of heavy
quarkonia which depends on the properties of the deconfined region. We find
typical enhancements of about 500 fold for the B_c production yields over
expectations from the elementary coherent hadronic B_c-meson production
scenario. The final population of bound states may serve as a probe of the
plasma phase parameters.


title: Supersymmetric Electroweak Baryogenesis and CP Violation

abstract:
  I review the mechanism of electroweak baryogenesis within the framework of a
string motivated supersymmetric extension of the Standard Model with large
flavor-independent CP-violating phases. Possible implications for the Higgs
sector are considered in correlation with the properties of the right-handed
stop. I also comment on the compatibility of supersymmetric electroweak
baryogenesis with various CP-violating observables.


title: Neutralino Dark Matter in Focus Point Supersymmetry

abstract:
  In recent work, it has been argued that multi-TeV masses for scalar
superpartners are not unnatural. Indeed, they appear to have significant
phenomenological virtues. Here we explore the implications of such `focus
point' supersymmetry for the dark matter problem. We find that constraints on
relic densities do not place upper bounds on neutralino or scalar masses. We
demonstrate that, in the specific context of minimal supergravity, a
cosmologically stable mixed gaugino-Higgsino state emerges as an excellent,
robust dark matter candidate. We estimate that, over a wide range of the
unknown parameters, the spin-independent proton-neutralino cross sections fall
in the range accessible to planned search experiments.


title: Unitarity at small Bjorken x

abstract:
  This paper presents a solution to the nonlinear small x ``projectile side''
evolution equations as derived by Balitskii in 1996. The solution is based on
functional Fokker-Planck methods. The fixed point at small x is explicitly
calculated and all correlation functions in this limit are determined. They
show clear saturation and unitarization properties. Scaling laws that hold
during the saturation phase and throughout the whole course of the evolution
are established. The corresponding Langevin equations are given as a basis for
numerical simulations opening the field for future studies of dynamical issues
of the evolution not analytically accessible. The methods used may be extended
to the ``target side'' equations of Jalilian-Marian, Kovner, Leonidov and
Weigert.


title:
Enhanced antiproton production in Pb(160 AGeV)+Pb reactions: evidence
  for quark gluon matter?

abstract:
  The centrality dependence of the antiproton per participant ratio is studied
in Pb(160 AGeV)+Pb reactions. Antiproton production in collisions of heavy
nuclei at the CERN/SPS seems considerably enhanced as compared to conventional
hadronic physics, given by the antiproton production rates in $pp$ and
antiproton annihilation in $\bar{p}p$ reactions. This enhancement is consistent
with the observation of strong in-medium effects in other hadronic observables
and may be an indication of partial restoration of chiral symmetry.


title: Towards softer scales in hot QCD

abstract:
  An effective theory for the soft field modes in hot QCD has been obtained
recently by integrating out the field modes of momenta of order T and g T. The
mean hard particle distribution obeys a transport equation with a collision
term. The scale that comes out for the soft field is g^2 T ln 1/g .
  N-gluon soft amplitudes are shown to be a sum of tree diagrams and to obey
tree-like Ward identities. These effective amplitudes are used to compute the
one-soft loop contribution to the gluon self-energy when the loop momentum is
of order g^2 T ln 1/g. It allows to identify a new collision term which, when
included into the transport equation, takes into account collisions with gluon
exchange of order g^2 T ln 1/g. The infrared behaviour of the collision term
exhibits a significant change.


title: SARGE: an algorithm for generating QCD-antennas

abstract:
  We present an algorithm to generate any number of random massless momenta in
phase space, with a distribution that contains the kinematical pole structure
that is typically found in multi-parton QCD-processes. As an application, we
calculate the cross-section of some \eplus\eminus \to partons processes, and
compare SARGE's performance with that of the uniform-phase space generator
RAMBO.


title:
Lepton number violating interactions and their effects on neutrino
  oscillation experiments

abstract:
  Mixing between bosons that transform differently under the standard model
gauge group, but identically under its unbroken subgroup, can induce
interactions that violate the total lepton number. We discuss four-fermion
operators that mediate lepton number violating neutrino interactions both in a
model-independent framework and within supersymmetry (SUSY) without R-parity.
The effective couplings of such operators are constrained by: i) the upper
bounds on the relevant elementary couplings between the bosons and the
fermions, ii) by the limit on universality violation in pion decays, iii) by
the data on neutrinoless double beta decay and, iv) by loop-induced neutrino
masses. We find that the present bounds imply that lepton number violating
neutrino interactions are not relevant for the solar and atmospheric neutrino
problems. Within SUSY without R-parity also the LSND anomaly cannot be
explained by such interactions, but one cannot rule out an effect
model-independently. Possible consequences for future terrestrial neutrino
oscillation experiments and for neutrinos from a supernova are discussed.


title:
Status of the solution to the solar neutrino problem based on
  non-standard neutrino interactions

abstract:
  We analyze the current status of the solution to the solar neutrino problem
based both on: a) non-standard flavor changing neutrino interactions (FCNI) and
b) non-universal flavor diagonal neutrino interactions (FDNI). We find that
FCNI and FDNI with matter in the sun as well as in the earth provide a good fit
not only to the total rate measured by all solar neutrino experiments but also
to the day-night and seasonal variations of the event rate, as well as the
recoil electron energy spectrum measured by the SuperKamiokande collaboration.
This solution does not require massive neutrinos and neutrino mixing in vacuum.
Stringent experimental constraints on FCNI from bounds on lepton flavor
violating decays and on FDNI from limits on lepton universality violation rule
out $\nu_e \to \nu_\mu$ transitions induced by New Physics as a solution to the
solar neutrino problem. However, a solution involving $\nu_e \to \nu_\tau$
transitions is viable and could be tested independently by the upcoming
$B$-factories if flavor violating tau decays would be observed at a rate close
to the present upper bounds.


title: Flat direction condensate instabilities in the MSSM

abstract:
  Coherently oscillating scalar condensates formed along flat directions of the
MSSM scalar potential are unstable with respect to spatial perturbations if the
potential is flatter than phi^2, resulting in the formation of non-topological
solitons such as Q-balls. Using renormalization group we calculate the
corrections to the phi^2 potential for a range of flat directions and show that
unstable condensates are a generic feature of the MSSM. Exceptions arise for an
experimentally testable range of stop and gluino masses when there are large
admixtures of stops in the flat direction scalar.


title:
Primordial galactic magnetic fields from domain walls at the QCD phase
  transition

abstract:
  We propose a mechanism to generate large-scale magnetic fields with
correlation lengths of 100 kpc. Domain walls with QCD scale internal structure
form and coalesce obtaining Hubble scale correlations and align nucleon spins.
Due to strong CP violation, nucleons in these walls have anomalous electric and
magnetic dipole moments and thus the walls are ferromagnetic. This induces
electromagnetic fields with Hubble size correlations. The same CP violation
also induces a maximal helicity (Chern-Simons) correlated through the Hubble
volume which supports an inverse cascade allowing the initial correlations to
grow to 100 kpc today. We estimate the generated electromagnetic fields in
terms of the QCD parameters and discuss the effects of the resulting fields.


title: Magnetic Z(N) symmetry in hot QCD and the spatial Wilson loop

abstract:
  We discuss the relation between the deconfining phase transition in gauge
theories and the realization of the magnetic Z(N) symmetry. At low temperature
the Z(N) symmetry is spontaneously broken while above the phase transition it
is restored. This is intimately related to the change of behaviour of the
spatial 't Hooft loop discussed in hep-ph/9909516. We also point out that the
realization of the magnetic symmetry has bearing on the behaviour of the
spatial Wilson loop. We give a physical argument to the effect that at zero
temperature the spatial Wilson loop must have perimeter law behaviour in the
symmetric phase but area law behaviour in the spontaneously broken phase. At
high temperature the argument does not hold and the restoration of magnetic
Z(N) is consistent with area law for the Wilson loop.


title: Large Extra Dimensions at Linear Colliders

abstract:
  In this talk, I first present the motivation for theories wherein extra
spacetime dimensions can be compactified to have large magnitudes. In
particular, I discuss the Arkani-Hamed, Dimopoulos, Dvali (ADD) scenario. I
present the constraints that have been derived on these models from current
experiments and the expectations from future colliders. I concentrate
particularly on the possibilities of probing these extra dimensions at future
linear colliders.


title:
Nucleon strangeness as the response to a strangeness-sensitive probe in
  a class of hadron models

abstract:
  On top of its valence quarks, the full nucleon ground state may contain
appreciable admixture of s-\bar{s} pairs already at small momentum transfers.
This paper discusses strangeness in the mean-field type of nucleon models, and
exemplifies this by explicit calculations in the MIT bag model enriched by the
presence of instantons.
  We calculate the instanton contribution to the strangeness in the MIT bag (on
top of the standard contribution to strangeness found in that model). Although
we do it in an essentially perturbative way, we present a detailed derivation
of the formula expressing nucleon matrix elements of bilinear strange quark
operators, in terms of a model valence nucleon state and interactions producing
quark-antiquark fluctuations on top of that valence state. We do it in detail
to clarify our argument that in the context of the mean-field type of quark
models (where a Fock state expansion exists and where the nucleon state can be
constructed out of single-quark states), the resulting formula acquires a
significance beyond perturbation theory.The derivation combines the usage of
the evolution operator containing a strangeness source, and Feynman-Hellmann
theorem.


title: Is Cabibbo-Kobayasi-Maskawa Matrix Unitary?

abstract:
  First, we give summary of the present values of CKM matrix elements. Then, we
discuss whether CKM matrix is unitary or not, and how we can find out if it is
not unitary.


title:
Subleading Sudakov logarithms in electroweak high energy processes to
  all orders

abstract:
  In future collider experiments at the TeV scale, large logarithmic
corrections originating from massive boson exchange can lead to significant
corrections to observable cross sections. Recently double logarithms of the
Sudakov-type were resummed for spontaneously broken gauge theories and found to
exponentiate. In this paper we use the virtual contributions to the
Altarelli-Parisi splitting functions to obtain the next to leading order kernel
of the infrared evolution equation in the fixed angle scattering regime at high
energies where particle masses can be neglected. In this regime the virtual
corrections can be described by a generalized renormalization group equation
with infrared singular anomalous dimensions. The results are valid for virtual
electroweak corrections to fermions and transversely polarized vector bosons
with an arbitrary number of external lines. The subleading terms are found to
exponentiate as well and are related to external lines, allowing for a
probabilistic interpretation in the massless limit. For $Z$-boson and $\gamma$
final states our approach leads to exponentiation with respect to each
amplitude containing the fields of the unbroken theory. For longitudinal
degrees of freedom it is shown that the equivalence theorem can be used to
obtain the correct double logarithmic asymptotics. At the subleading level,
corrections to the would be Goldstone bosons contribute which should be
considered separately. Explicit comparisons with existing one loop calculations
are made.


title: Hadron Structure Functions within a Chiral Quark Model

abstract:
  We outline a consistent regularization procedure to compute hadron structure
functions within bosonized chiral quark models. We impose the Pauli--Villars
scheme, which reproduces the chiral anomaly, to regularize the bosonized
action. We derive the Compton amplitude from this action and utilize the
Bjorken limit to extract structure functions that are consistent with the
scaling laws and sum rules of deep inelastic scattering.


title:
Extra Dimension Kaluza-Klein Excitations and Electroweak Symmetry
  Breaking

abstract:
  We review the possibilities that the Kaluza-Klein excitations of graviton
states induce electroweak symmetry breaking and that electroweak symmetry
breaking could have a large impact on KK phenomenology.


title: Leading twist asymmetries in deeply virtual Compton scattering

abstract:
  We calculate spin, charge, and azimuthal asymmetries in deeply virtual
Compton scattering at leading twist-two level. The measurement of these
asymmetries gives an access to the imaginary and real part of all deeply
virtual Compton scattering amplitudes. We note that a consistent description of
this process requires taking into account twist-three contributions and give
then a model dependent estimate of these asymmetries.


title:
Static correlation lengths in QCD at high temperatures and finite
  densities

abstract:
  We use a perturbatively derived effective field theory and three-dimensional
lattice simulations to determine the longest static correlation lengths in the
deconfined QCD plasma phase at high temperatures (T\gsim 2 Tc) and finite
densities (\mu\lsim 4 T). For vanishing chemical potential, we refine a
previous determination of the Debye screening length, and determine the
dependence of different correlation lengths on the number of massless flavours
as well as on the number of colours. For non-vanishing but small chemical
potential, the existence of Debye screening allows us to carry out simulations
corresponding to the full QCD with two (or three) massless dynamical flavours,
in spite of a complex action. We investigate how the correlation lengths in the
different quantum number channels change as the chemical potential is switched
on.


title:
Neutrino Oscillation and Charged Lepton-Flavor Violation in the
  Supersymmetric Standard Models

abstract:
  The neutrino experiment results suggest that the neutrinos have finite masses
and the lepton-flavor symmetries are violating in nature. In the supersymmetric
models, the charged lepton-flavor violating processes, such as mu -> e gamma
and tau -> mu gamma, may have the branching ratios accessible to the future
experiments, depending on origins of the neutrino masses and the SUSY breaking.
In this paper we discuss the branching ratios in the supergravity scenario
using the current solar and atmospheric neutrino experimental data.


title: Nuclear beta-decay, Atomic Parity Violation, and New Physics

abstract:
  Determinations of vuds with super-allowed Fermi beta-decay in nuclei and of
the weak charge of the cesium in atomic parity-violation deviate from the
Standard Model predicitions by 2 sigma or more. In both cases, the Standard
Model over-predicts the magnitudes of the relevant observables. I discuss the
implications of these results for R-parity violating (RPV) extensions of the
minimal supersymmetric Standard Model. I also explore the possible consequences
for RPV supersymmetry of prospective future low-energy electroweak
measurements.


title:
The "recoil" correction of order $m \alpha^6$ to hyperfine splitting of
  positronium ground state

abstract:
  The "recoil" correction of order $m \alpha^6$ to the hyperfine splitting of
positronium ground state was found. The formalism employed is based on the
noncovariant perturbation theory in QED. Equation for two-particle component of
full (many-body) wave function is used, in which effective Hamiltonian depends
on the energy of a system. The effective Hamiltonian is not restricted to the
nonrelativistic region, so there is no need in any regularization. To evaluate
integrals over loop momenta, they are divided into "hard" and "soft" parts,
coming from large and small momenta respectively. Soft contributions were found
analytically, and hard ones are evaluated by numerical integration. Some soft
terms due to the retardation cancel each other. To calculate the "hard"
contributions, a great number of noncovariant graphs is replaced by only a few
covariant ones. The hard contribution was found in two ways. The first way is
to evaluate contributions of separate graphs, using the Coulomb gauge. The
second one is to calculate full hard contribution as a whole using the Feynman
gauge. The final result for the "recoil" correction is $0.381(6) m\al^6$ and
agrees with those of previous papers. Diagram-to-diagram comparison with the
revised results of Adkins&Sapirstein was done. All the results agree, so the
"recoil" correction is now firmly established. This means a considerable
disagreement with the experimental data.


title: On the low-energy limit of string and M-theory

abstract:
  We discuss the possible applications of string theory for the construction of
generalizations of the $SU(3)\times SU(2)\times U(1)$ standard model of strong
and electroweak interactions. This includes an investigation of effective $d=4$
dimensional supergravity theories that could be derived from higher dimensional
string theories ($d=10$) and M-theory ($d=11$).It is shown how the question of
unification of gauge and gravitational coupling constants could find a solution
within this framework. The mechanism of hidden sector supersymmetry breakdown
and its consequences for the pattern for soft supersymmetry breaking terms are
discussed in detail.


title: Quark mixings and flavor changing interactions with singlet quarks

abstract:
  Aspects of the quark mixings and flavor changing interactions are
investigated in electroweak models with singlet quarks. The effects on the
ordinary quark mixing are determined in terms of the quark masses and the
parameters describing the mixing between the ordinary quarks q and the singlet
quarks Q (q-Q mixing). Some salient features arise in the flavor changing
interactions through the q-Q mixing. The unitarity of the
Cabibbo-Kobayashi-Maskawa (CKM) matrix within the ordinary quark sector is
violated, and the flavor changing neutral currents (FCNC's) appear both in the
gauge and scalar couplings. The flavor changing interactions are calculated
appropriately in terms of the q-Q mixing parameters and the quark masses, which
really exhibit specific flavor structures. It is found that there are
reasonable ranges of the model parameters to reproduce the ordinary quark mass
hierarchy and the actual CKM structure even in the presence of q-Q mixing. Some
phenomenological effects of the singlet quarks are also discussed. In
particular, the scalar FCNC's may be more important in some cases, if the
singlet quarks as well as the extra scalar particles from the singlet Higgs
fields have masses $\sim$ 100 GeV -- 1 TeV.


title: A Possible Two-Component Structure of the Non-Perturbative Pomeron

abstract:
  We propose a QCD-inspired two-component Pomeron form which gives an excellent
description of the proton-proton, pi-proton, kaon-proton, gamma-proton and
gamma-gamma total cross sections. Our fit has a better CHI2/dof for a smaller
number of parameters as compared with the PDG fit. Our 2-Pomeron form is fully
compatible with weak Regge exchange-degeneracy, universality, Regge
factorization and the generalized vector dominance model.


title: R-Parity Violation and the Decay b to s gamma

abstract:
  We investigate the influence of the R-parity violating couplings lambda,
lambda' and lambda'' on the branching ratio of b to s gamma in leading
logarithmic approximation. The operator basis is enlarged and the corresponding
gamma-matrix calculated. The matching conditions receive new contributions from
the R-parity violating sector. The comparison with the experiment is rather
difficult due to the model dependence of the result.


title: Heavy Quark Pair Production in Polarized Photon--Photon Collisions

abstract:
  We present the next-to-leading-order cross sections of the heavy
quark-antiquark pair production in polarized photon-photon collision for the
general case of photon polarizations. The numerical results for top-antitop
production cross sections together with production asymmetries are obtained for
linearly polarized photon-photon collisions, including one-loop QCD radiative
corrections.


title:
CP odd anomalous interactions of Higgs boson in its production at Photon
  Colliders

abstract:
  We discuss the potentialities of the study of CP-odd interactions of the
Higgs boson with photons via its production at gamma-gamma and e-gamma
colliders. Our treatment of H-gamma-gamma and H-Z-gamma anomalous interactions
includes a set of parameters, whose impact on physical observables has not been
considered before. We focus on two reactions - gamma+gamma-->H and e+gamma-->eH
- and introduce the polarization and/or azimuthal asymmetries that are
particularly sensitive to specific features of anomalies. We discuss the ways
of disentangling effects of physically different parameters of anomalies and
estimate what magnitude of CP violating phenomena can be seen in these
experiments.


title: Q-ball formation in the MSSM with explicit CP violation

abstract:
  Q-balls generically exist in the supersymmetric extensions of the standard
model. Taking into account the additional sources of CP violation, which are
naturally accomodated by the supersymmetric models, it is shown that the Q-ball
matter depends additively on individual CP phases, whereas mass per unit charge
in the Q-ball depends only on the relative phases. There are regions of the
parameter space where there is no stable Q-ball solution in the CP-conserving
limit whereas finite CP phases induce a stable Q-ball.


title:
Electroweak Bloch-Nordsieck violation at the TeV scale: "strong" weak
  interactions ?

abstract:
  Hard processes at the TeV scale exhibit enhanced (double log) EW corrections
even for inclusive observables, leading to violation of the Bloch-Nordsieck
theorem. This effect, previously related to the non abelian nature of free EW
charges in the initial state (e- e+, e- p, p p ...), is here investigated for
fermion initiated hard processes and to all orders in EW couplings. We find
that the effect is important, especially for lepton initiated processes,
producing weak effects that in some cases compete in magnitude with the strong
ones. We show that this (double log) BN violating effect has a universal energy
dependence, related to the Sudakov form factor in the adjoint representation.
The role of this form factor is to suppress cross section differences within a
weak isospin doublet, so that at very large energy the cross sections for
left-handed electron-positron and neutrino-positron scattering become equal.
Finally, we briefly discuss the phenomenological relevance of our results for
future colliders.


title: Electroweak symmetry breaking by extra dimensions

abstract:
  Electroweak symmetry breaking may be naturally induced by the observed quark
and gauge fields in extra dimensions without a fundamental Higgs field. We show
that a composite Higgs doublet can arise as a bound state of $(t, b)_L$ and a
linear combination of the Kaluza-Klein states of $t_R$, due to QCD in extra
dimensions. The top quark mass depends on the number of active $t_R$
Kaluza-Klein modes, and is consistent with the experimental value.


title: Charm Production by Cosmic Muons

abstract:
  Narrow muon bundles in underground detectors permit to study muoproduction
reactions that take place in the surrounding rock. We analyze the relevance of
a QED+QCD reaction, muoproduction of "open charm". The contribution to double
muon events is estimated to be 4-8 % of the one due to QED "trident" process,
for an ideal detector located under a rock depth of 3 km water equivalent, and
an observation threshold of 1 GeV.