title: Standard Model with Duality: Physical Consequences

abstract:
  The Dualized Standard Model offers a natural place both to Higgs fields and
to fermion generations with Higgs fields appearing as frame vectors in internal
symmetry space and generation appearing as dual colour. If they are assigned
those niches, it follows that there are exactly 3 generations of fermions, and
that at the tree-level, only one generation has a mass (fermion mass hierarchy)
while the CKM matrix is the identity. However, loop corrections lift this
degeneracy giving nonzero CKM mixing and masses to fermions of the two lower
generations. A recent calculation to 1-loop level, with just a few parameters,
yields a very good fit to the empirical CKM matrix and sensible values also to
the lower generation masses. In addition, predictions are obtained, in areas
ranging from low energy flavour-changing neutral current decays to extremely
high energy cosmic rays, which are testable in experiments now being planned.


title:
Elastic \rho' and \phi Meson Photo- and Electroproduction with
  Non-Resonant Background

abstract:
  The backgrounds due to the direct diffractive dissociation of the photon into
the $\pi^+\pi^-$ as well as $K^+K^-$ pairs to the "elastic" diffractive $\rho
'$ and $\phi $ mesons production in electron-proton collisions are calculated.
It is shown that the role of background and background-resonant interference
contributions is very important in experimental distribution of $M_{\pi^+
\pi^-}$ in the $\rho '$ mass region. The amplitude for the background process
is proportional to the $\pi$-meson - proton or K-meson - proton cross sections.
Therefore, describing the HERA data, one can estimate $\sigma (\pi p)$ and
$\sigma (Kp)$ at energies higher than the region of direct measurements.


title: Light quarks masses and condensates in QCD

abstract:
  We review some theoretical and phenomenological aspects of the scenario in
which the spontaneous breaking of chiral symmetry is not triggered by a
formation of a large condensate <\bar{q} q>. Emphasis is put on the resulting
pattern of light quark masses, on the constraints arising from QCD sum rules
and on forthcoming experimental tests.


title: On the determination of CP violating Majorana phases

abstract:
  The determination of CP violating phases in the Majorana neutrino mixing
matrix using phenomenological constraints from neutrino oscillations,
neutrinoless double beta decay, ($\mu^-, e^+$) conversion and few other
processes is discussed. We give the expressions for the phases in terms of the
mixing angles and masses consistent with the recent data from Kamiokande.


title: Polarization of tau leptons in semileptonic B decays

abstract:
  Analytic formulae for the one-loop order QCD corrections to the differential
width of the semileptonic b decay are given with the tau polarization taken
into account. Thence the polarization of tau is expressed by its energy and the
invariant mass of the tau + antineutrino system. The non-perturbative
corrections by Falk et al. are incorporated in the calculation.


title:
The ratio of p and n yields in NC neutrino(antineutrino)-nucleus
  scattering and strange form factors of the nucleon

abstract:
  We calculate the ratio of proton and neutron yields in NC induced
neutrino(antineutrino)-nucleus inelastic scattering at neutrino energies of
about 1 GeV. We show that this ratio depends very weakly on the nuclear models
employed and that in the neutrino and antineutrino cases the ratios have
different sensitivity to the axial and vector strange form factors; moreover,
the ratio of antineutrino--nucleus cross sections turns out to be rather
sensitive to the electric strange form factor. We demonstrate that measurements
of these ratios will allow to get information on the strange form factors of
the nucleon in the region Q > 0.4 GeV^2.


title: QCD at high energies

abstract:
  The following topics in perturbative QCD are reviewed: recent theoretical
progress in higher-order calculations; soft-gluon resummation for
hard-scattering processes at large $E_T$ and high $x$; low-$x$ behaviour of
structure functions and recent theoretical results on BFKL dynamics; infrared
renormalons and power corrections to perturbative predictions; updated summary
of $\as$ measurements.


title: On non-perturbative corrections to the Kahler potential

abstract:
  We present the results of a detailed investigation into the consequences of
adding specific string motivated non-perturbative corrections to the usual tree
level Kahler potential in dilaton dominated scenarios. The success of the model
is judged through our ability to obtain a realistic VEV for the dilaton < Re S
> ~ 2, corresponding to the true minima of the scalar potential and being
associated with a reasonable value for the SUSY breaking scale via the
gravitino mass. The status of the so-called moduli problem is also reviewed in
each of the ansatze studied. Those include previous proposals made in the
context of both the chiral and the linear multiplet formalisms to describe
gaugino condensation, and a new ansatz which shows explicitly the equivalence
between the two.


title: Physics at Future Colliders

abstract:
  After a brief review of the Big Issues in particle physics, we discuss the
contributions to resolving that could be made by various planned and proposed
future colliders. These include future runs of LEP and the Fermilab Tevatron
collider, B factories, RHIC, the LHC, a linear electron-positron collider, an
electron-proton collider in the LEP/LHC tunnel, a muon collider and a future
larger hadron collider (FLHC). The Higgs boson and supersymmetry are used as
benchmarks for assessing their capabilities. The LHC has great capacities for
precision measurements as well as exploration, but also shortcomings where the
complementary strengths of a linear electron-positron collider would be
invaluable. It is not too soon to study seriously possible subsequent
colliders.


title:
Branching Ratios and CP Asymmetries of B Decays to a Vector and a
  Pseudoscalar Meson

abstract:
  We consider two body decays of B meson into a light vector (V) and a
pseudoscalar (P) meson. The constraint obtained from the $B\to P P$ modes on
the parameter space of the input parameters is imposed also on $B\to V P$
modes. In particular we constrain $\xi\equiv (1/N_c)$ for those modes from
recently measured $B\to \omega K, \phi K$ and are able to get a satisfactory
pictures for all modes where data exists. Modes that should be seen shortly and
those with possibly large CP asymmetries are identified.


title:
Hybrid MSW + VO Solution of the Solar Neutrino Problem in
  String-Motivated Unified Theories

abstract:
  It is shown that the hybrid MSW + VO solution of the solar neutrino problem,
according to which the solar nu_e undergo matter-enhanced transitions into
nu_mu, nu_tau in the Sun followed by long wave length (about 1.5 10^8 km) nu_e
-> nu_mu, nu_tau oscillations in vacuum between the Sun and the Earth, can
occur naturally in string-motivated grand unified theories. We consider the
supersymmetric version of a string-type SU(4)xSU(2)_LxSU(2)_R theory with
U(1)_X family symmetry, which was shown to successfully describe the charged
fermion masses and the quark mixing, and extend the earlier fermion mass
analysis to the neutrino sector. We show that the four oscillation parameters
Delta m_31^2, Delta m_21^2 and sin^2 2 theta_12, sin^2 2 theta_13,
characterising the combined matter-enhanced transitions and vacuum oscillations
of the solar nu_e, naturally get values in the ranges of the hybrid MSW + VO
solutions found recently.


title:
Self-consistent calculation of parton distributions at low normalization
  point in the chiral quark-soliton model

abstract:
  We calculate the isosinglet unpolarized quark-- and antiquark distributions
at a low normalization point in the large--$N_c$ limit. The nucleon is
described as a self-consistent soliton solution of the effective chiral theory.
The ultraviolet cutoff is implemented by a Pauli-Villars subtraction. The quark
and antiquark distributions satisfy the momentum as well as the baryon number
sum rule, corresponding to ``constituent'' quarks whose structure is not yet
resolved at the low scale. Already at this level a sizable number of antiquarks
is present.


title: Spin content of the nucleon in a valence and sea quark mixing model

abstract:
  A dynamical valence and sea quark mixing model is shown to fit the baryon
ground state properties as well as the spin content of the nucleon. The
relativistic correction and the $q^3{\leftrightarrow} q^3q\bar{q}$ transition
terms induced by the quark axial vector current
$\bar{\psi}\vec{\gamma}\gamma^5\psi$ in this model space is responsible for the
quark spin reduction.


title: A new method for the calculation of massive multiloop diagrams

abstract:
  Starting from the parametric representation of a Feynman diagram, we obtain
it's well defined value in dimensional regularisation by changing the integrals
over parameters into contour integrals. That way we eventually arrive at a
representation consisting of well-defined compact integrals. The result is a
simple transformation of the integrand which gives the analytic continuation of
a wide class of Feynmanintegrals. The algorithm will especially be fit for
numerical calculation of general massive multi-loop integrals. An important
advantage of this method is that it allows us to calculate both infinite and
finite parts independently.


title: Novel Enhancement of Loop-Induced $H^\pm W^\mp Z^0$ Vertex

abstract:
  We discuss the non-decoupling effects on the loop-induced $H^\pm W^\mp Z^0$
vertex in the general two Higgs-doublet model. The decay process $H^\pm \to
W^\pm Z^0$ is analyzed at one-loop level and possible enhancement of the decay
width is explored. We find that a novel enhancement can be realized by the
Higgs non-decoupling effects with large mass difference between charged and
CP-odd Higgs bosons. The branching ratio of the process can be a few % $\sim$
10%. Therefore the decay mode may be detectable at LHC or future $e^+e^-$
linear colliders (LC's).


title:
Form Factors of $\gamma^{*}\rho\to\pi$ and $\gamma^{*}\gamma\to\pi^0$
  Transitions and Light-Cone Sum Rules

abstract:
  The method of light-cone QCD sum rules is applied to the calculation of the
form factors of $\gamma^*\rho \to \pi$ and $\gamma^*\gamma \to \pi^0$
transitions. We consider the dispersion relation for the
$\gamma^*(Q^2)\gamma^*(q^2) \to \pi^0$ amplitude in the variable $q^2$. At
large virtualities $q^2$ and $Q^2$, this amplitude is calculated in terms of
light-cone wave functions of the pion. As a next step, the light-cone sum rule
for the $\gamma^*(Q^2) \rho \to \pi $ form factor is derived. This sum rule,
together with the quark-hadron duality, provides an estimate of the hadronic
spectral density in the dispersion relation. Finally, the $\gamma^*(Q^2)\gamma
\to \pi^0$ form factor is obtained taking the $q^2=0$ limit in this relation.
Our predictions are valid at $Q^2 \geq 1 {GeV}^2$ and have a correct asymptotic
behaviour at large $Q^2$.


title: Heavy-Flavour Pentaquarks in a Chiral Constituent Quark Model

abstract:
  Within the chiral constituent quark model of Glozman and Riska, we discuss
the stability of heavy pentaquarks, i.e. hadrons containing four light quarks
and a heavy antiquark. The spin-dependent part of the Hamiltonian is dominated
by the short-range part of the Goldstone-boson-exchange interaction. We find
that these systems are not bound, having an energy above the lowest
dissociation threshold into a baryon and a meson.


title: Strange Skyrmions: status and observable predictions

abstract:
  The chiral soliton approach (CSA) provides predictions of the rich spectrum
of baryonic states with different values of strangeness for any baryon number
B. In the sector with B=1 the well known octet and decuplet of baryons are
described within CSA, and some exotic states are predicted. In the B=2 sector
there are many predictions, but only few of them - e.g. the existence of the
virtual $\Lambda$N-state - have been confirmed till now. Possible reasons for
this are discussed. In particular, the B=2 SO(3) hedgehog interpreted usually
as H-particle within CSA has dimensions considerably smaller than dimensions of
the deuteron. Therefore, the estimates of its production cross section made
previously in the assumption that H-particle and deuteron are approximately of
the same size, may be too optimistic. Other branches of the CSA predictions
corresponding to other local minima of the B=2 configurations of the SU(3)
chiral fields: SU(2) torus and skyrmion molecule with strangeness content close
to 0.5 are also considered.


title:
Bounds on sterile neutrino mixing for cosmologically interesting mass
  range

abstract:
  This talk summarizes our recent work which studied the impact of resonant
$\nu_e \to\nu_s$ and $\bar{\nu}_e\to\bar{\nu}_s$ ($\nu_s$ is a sterile
neutrino) conversions on supernova physics, under the assumption that the mass
of the sterile state is in the few eV -cosmologically significant range.


title: Borexino as a test of solar matter density fluctuations

abstract:
  This talk summarizes some results of our recent work focusing on the
possibility to test solar matter density fluctuations by the future Borexino
experiment.


title: Next-to-leading gluonic reggeons in the high-energy effective action

abstract:
  We study the next-to-leading gluon exchange in the high-energy scattering
that contributes to the amplitude to order $s^0$ up to logarithmic corrections.
Similar to the leading gluon exchange these contribution can be described in
terms of reggeon exchanges. There are several gluonic reggeons at the
next-to-leading level. Some of them transfer parity or gauge group
representation different from the leading gluonic reggeon. Unlike the leading
one they are sensitive to the helicity and transverse momenta of the scattering
partons. We extend the high-energy effective action and derive from the action
of gluodynamics the terms describing the next-to-leading reggeons and their
interaction in the multi-Regge approximation.


title:
Patterns of Spontaneous Chiral Symmetry Breaking in the Large-Nc Limit
  of QCD-Like Theories

abstract:
  It is shown that in vector-like gauge theories, such as QCD, and in the limit
of a large number of colours Nc, the ordering pattern of narrow vector and
axial-vector states at low energies is correlated with the size of the possible
local order parameters of chiral symmetry breaking. This has implications on
the underlying dynamics of spontaneous chiral symmetry breaking in QCD, and
also on possible values of the parameter S for oblique electroweak corrections,
the analogue of the QCD low energy constant L10.


title: Review on the Status of Spin Structure Function Measurements

abstract: This paper has been withdrawn by the author


title:
Running Coupling in Non-Perturbative QCD - I. Bare Vertices and y-max
  Approximation

abstract:
  A recent claim that in quantum chromodynamics the gluon propagator vanishes
in the infrared limit, while the ghost propagator is more singular than a
simple pole, is investigated analytically and numerically. This picture is
shown to be supported even at the level in which the vertices in the
Dyson-Schwinger equations are taken to be bare. The running coupling is shown
to be uniquely determined by the equations and to have a large finite infrared
limit.


title:
The gaussian propagator formalism and the determination of the leading
  Regge trajectory for phi^3 field theory

abstract:
  As the number of loops goes to infinity Feynman $\alpha$-parameters undergo a
fixing mechanism which entails a gaussian representation for propagators in
scalar field theories. Here, we describe this mechanism in the fullest detail.
The fixed values are in fact mean-values which can be determined via
consistency conditions. The consistency conditions imply that one
$\alpha$-parameter is integrated in the usual way and the dependence of the
mean-values of the other $\alpha$-parameters on it must be determined. Here we
present a method for doing this exactly which requires the solution of an
equation system. We present an analytic solution for this equation system in
the case of the ladder-graph topology. The Regge behaviour is obtained in a
simple way as well as an analytic expression for the leading Regge trajectory.
Then, the consistency equations for the two (in the ladder case) independent
$\alpha$-parameters mean-values are solved numerically. Agreement with previous
determinations of the intercept $\alpha (0)$ is obtained for $\alpha (0) \
\gsim$ 0.3. However, we are able to calculate $\alpha (t/m^2)$ for - 3.6
$\lsim$ $t/m^2$ $\lsim$ 1.8 and find that it is close to linear.
  We consider the massless limit of the theory and find that the
$\alpha$-parameters mean-values and the trajectory $\alpha (t)$ have limits
which are independent of the mass, a phenomenon which also occurs for
renormalizable theories via the renormalization group equations.


title: Relativistic Antihydrogen Production

abstract:
  We calculate the production of relativistic antihydrogen atoms by bound-free
pair production. The cross section is calculated in the semiclassical
approximation (SCA), or equivalently in the plane wave Born approximation
(PWBA) using exact Dirac-Coulomb wave functions. We compare our calculations to
the equivalent photon approximation (EPA).


title: Neutrino Magnetic Moment Upper Bound From Solar Neutrino Observations

abstract:
  Using the data from SuperKamiokande, Kamiokande and Homestake solar neutrino
experiments we derive an upper bound on the magnetic moment of the neutrino and
find $\mu_{\nu_e}\leq(2.2-2.3)\times 10^{-10}\mu_{B}$, within four different
standard solar models. We assume equal magnetic moments for all neutrino
flavours. This limit is obtained when neutrinos do not undergo any
"disappearence" mechanism other than the magnetic moment conversion due to the
solar magnetic field and for a total or nearly total suppression of the
intermediate energy neutrinos. In our work we consider an energy dependent
suppression of solar neutrinos. We also point out that the limit may be further
reduced if the detector threshold energy in $\nu_{e,x}e^{-}$ scattering with
solar neutrinos is decreased.


title: Neutrino ground state in a dense star

abstract:
  It has recently been argued that long range forces due to the exchange of
massless neutrinos give rise to a very large self-energy in a dense,
finite-ranged, weakly-charged medium. Such an effect, if real, would
destabilize a neutron star. To address this issue we have studied the related
problem of a massless neutrino field in the presence of an external, static
electroweak potential of finite range. To be precise, we have computed to one
loop the exact vacuum energy for the case of a spherical square well potential
of depth alpha and radius R. For small wells, the vacuum energy is reliably
determined by a perturbative expansion in the external potential. For large
wells, however, the perturbative expansion breaks down. A manifestation of this
breakdown is that the vacuum carries a non-zero neutrino charge. The energy and
neutrino charge of the ground state are, to a good approximation for large
wells, those of a neutrino condensate with chemical potential mu=alpha. Our
results demonstrate explicitly that long-range forces due to the exchange of
massless neutrinos do not threaten the stability of neutron stars.


title: The MSSM and Why it Works

abstract:
  An introduction to the minimal supersymmetric standard model is presented. We
emphasize phenomenological motivations for this model, along with examples of
experimental tests. Particular attention is paid to the Higgs sector of the
theory.


title: Probing Anomalous Higgs Coupling through mu+ mu- --> H gamma

abstract:
  The process mu+ mu- --> H gamma, though small compared to the resonance
process, could be observable at proposed muon colliders, given expected
integrated luminosities. The apparently leading diagrams occur at tree-level,
and are proportional to the Higgs-muon coupling. We show, however, that the
one-loop contribution is comparable to the tree-level amplitude. Furthermore,
the one-loop diagrams, unlike those at tree-level, could be greatly enhanced by
possible anomalous Higgs-top quark or Higgs-gauge boson couplings. For a 500
GeV unpolarized muon collider, the total cross section for H-gamma associated
production approaches 0.1 fb.


title: Confinement and the Supercritical Pomeron in QCD

abstract:
  Deep-inelastic diffractive scaling violations have provided fundamental
insight into the QCD pomeron, suggesting a single gluon inner structure rather
than that of a perturbative two-gluon bound state. This paper derives a
high-energy, transverse momentum cut-off, confining solution of QCD. The
pomeron, in first approximation, is a single reggeized gluon plus a ``wee
parton'' component that compensates for the color and particle properties of
the gluon. This solution corresponds to a supercritical phase of Reggeon Field
Theory.
  Beginning with the multi-regge behavior of massive quark and gluon
amplitudes, reggeon unitarity is used to derive a reggeon diagram description
of a wide class of multi-regge amplitudes, including those describing the
formation and scattering of bound-state Regge poles. When quark and gluon
masses are taken to zero, a logarithmic divergence is produced by helicity-flip
reggeon interactions containing the infra-red quark triangle anomaly. With the
gauge symmetry partially broken, this divergence selects the bound states and
amplitudes of a confining theory. Both the pomeron and hadrons have an
anomalous color parity wee-parton component. For the pomeron the wee parton
component determines that it carries negative color charge parity and that the
leading singularity is an isolated Regge pole.


title: Threshold Expansion and Dimensionally Regularised NRQCD

abstract:
  A Lagrangean and a set of Feynman rules are presented for non-relativistic
QFT's with manifest power counting in the heavy particle velocity $v$. A
r\'egime is identified in which energies and momenta are of order $Mv$. It is
neither identical to the ultrasoft r\'egime corresponding to radiative
processes with energies and momenta of order $Mv^2$, nor to the potential
r\'egime with on shell heavy particles and Coulomb binding. In this soft
r\'egime, massless particles are on shell, and heavy particle propagators
become static. Examples show that it contributes to one- and two-loop
corrections of scattering and production amplitudes near threshold. Hence,
NRQFT agrees with the results of threshold expansion. A simple example also
demonstrates the power of dimensional regularisation in NRQFT.


title: On the CP asymmetries in Majorana neutrino decays

abstract:
  We study the CP asymmetries in lepton number violating two body scattering
processes and show explicitly how they vanish, in agreement with unitarity
constraints. We relate these cross section asymmetries to the CP decay rate
asymmetries of the intermediate massive neutrinos and show how the inclusion of
the Universe expansion via Boltzmann equations is the key ingredient to allow
the production of a non-vanishing asymmetry in spite of the unitarity
constraint on the cross sections. We then show that the absorptive parts of
both the one loop vertex and self energy corrections do contribute to the CP
decay asymmetries.


title:
The diffraction cone for exclusive vector meson production in deep
  inelastic scattering

abstract:
  We develop the color dipole gBFKL phenomenology of a diffraction cone for
photo- and electroproduction $\gamma^{*}N \to VN$ of heavy vector mesons
(charmonium & bottonium) at HERA and in fixed target experiments. We predict a
substantial shrinkage of the diffraction cone from the CERN/FNAL to the HERA
range of c.m.s. energy $W$. The $Q^{2}$-controlled selectivity to the color
dipole size (scanning phenomenon) is shown to lead to a decrease of the
diffraction slope with $Q^{2}$ (which is supported by the available
experimental data). We predict an approximate flavor independence of the
diffraction slope in the scaling variable $Q^{2}+m_{V}^{2}$. For diffractive
production of the radially excited $2S$ states ($\Psi',\Upsilon'$) the
counterintuitive inequality of diffraction slopes $B(2S) \lsim B(1S)$ is
predicted, which defies the common wisdom that diffraction slopes are larger
for reactions with larger size particles.


title: R-Parity Violation and the HERA Events

abstract:
  The excess in high-Q^2 events at HERA is introduced and possible explanations
within the framework of R-parity violating supersymmetry are discussed.


title:
Photon Pair Production with Soft Gluon Resummation in Hadronic
  Interactions

abstract:
  The production rate and kinematic distributions of isolated photon pairs
produced in hadron interactions are studied. The effects of the initial-state
multiple soft-gluon emission to the scattering subprocesses q-qbar, qg, and gg
to gamma gamma X are resummed with the Collins-Soper-Sterman soft gluon
resummation formalism. The effects of fragmentation photons from qg to gamma q,
followed by q to gamma X, are also studied. The results are compared with data
from the Fermilab Tevatron collider. A prediction of the production rate and
kinematic distributions of the diphoton pair in proton-nucleon reactions is
also presented.


title: Nucleon parton distributions in the large $N_c$ limit

abstract:
  We review recent progress in calculating the twist--2 parton distribution
functions at a low normalization point in the large--$N_c$ limit, where the
nucleon can be described as a soliton of the effective chiral lagrangian. This
field-theoretic approach preserves all general requirements on the distribution
functions (positivity, normalization etc.). In particular, it allows to
calculate the polarized and unpolarized antiquark distributions at the low
normalization point.


title:
Remarks on Next-to-Leading Order Analysis of Polarized Deep Inelastic
  Scattering Data

abstract:
  Since the x dependence of the axial-anomaly effect in inclusive polarized
deep inelastic scattering is fixed, the transformation from the $\bar{MS}$
scheme to different factorization schemes are not arbitrary. If the quark spin
distribution is demanded to be anomaly-free so that it does not evolve with
$Q^2$ and hard gluons contribute to the first moment of $g_1(x)$, then all the
moments of coefficient and splitting functions are fixed by perturbative QCD
for a given $\gamma_5$ prescription, contrary to the commonly used
Adler-Bardeen (AB) or AB-like scheme. It is urged that, in order to correctly
demonstrate the effect of factorization scheme dependence, the QCD analysis of
polarized structure functions in next-to-leading order should be performed,
besides the $\bar{MS}$ scheme, in the chiral-invariant factorization scheme in
which the axial anomaly resides in the gluon coefficient function, instead of
the less consistent and ambiguous AB scheme.


title: Precision W-Boson and Higgs Boson Mass Determinations at Muon Colliders

abstract:
  Precise determinations of the masses of the $W$ boson and of the top quark
could stringently test the radiative structure of the Standard Model (SM) or
provide evidence for new physics. We analyze the excellent prospects at a muon
collider for measuring $M_W$ and $m_t$ in the $W^+W^-$ and $ZH$ threshold
regions. With an integrated luminosity of 10 (100) fb$^{-1}$, the W-boson mass
could be measured to a precision of 20 (6) MeV, provided that theoretical and
experimental systematics are understood. A measurement of $\Delta M_W=6$ MeV
would constrain the mass of a $\sim 100$ GeV Higgs to about $\pm 10$ GeV. We
demonstrate that a measurement at future colliders of the Bjorken process. With
an integrated luminosity of $100\fbi$ it is possible to measure the Standard
Model Higgs mass to within 45\mev at a $\mu^+\mu^-$ collider for $\mh=100\gev$.


title: CP Violation -- An Essential Mystery in Nature's Grand Design

abstract:
  CP violation has so far been observed in one system only, namely in the
decays of neutral kaons, and it can still be described by a single real
quantity corresponding to a superweak scenario. In these lectures I describe
why limitations on CP invariance are a particularly fundamental phenomenon and
what experimental information is available. The KM ansatz constitutes the
minimal implementation of CP violation: without requiring unknown degrees of
freedom it can reproduce the known CP phenomenology. It unequivocally predicts
large or even huge CP asymmetries of various kinds in the decays of beauty
hadrons. New theoretical technologies will enable us in the foreseeable future
to express at least some of these predictions in a quantitatively reliable
fashion. There is tremendous potential for discovering New Physics in beauty
transitions. Continuing efforts in strange decays and further dedicated
searches for electric dipole moments and for CP asymmetries in charm decays are
likewise essential for discovering crucial elements that still are missing in
the puzzle that is Nature's Grand Design.


title:
Two Pion Correlations as a Possible Experimental Probe for Disoriented
  Chiral Condensates

abstract:
  We discuss two-pion correlations as a possible experimental probe into
disoriented chiral condensates. In particular, we point out that the
iso-singlet squeezed states of the BCS type have peculiar two-particle
correlations in the back-to-back and the identical momentum configurations
which should be detectable experimentally. We motivate the examination of the
squeezed state by showing that such state naturally appears in a final stage of
nonequilibrium phase transitions via the parametric resonance mechanism
proposed by Mr\'owczy\'nski and M\"uller.


title: On the renormalization-scheme dependence in quantum field theory

abstract:
  Using quantum electrodynamics as an example, a dependence of physical
predictions of quantum field theory in a finite perturbation theory order on
the choice of renormalization scheme is studied. It is shown that On-Mass-Shell
renormalization scheme is distinguished in quantum electrodynamics not only due
to the agreement of the theory predictions with experimental results but also
due to a set of specific theoretical properties. Thus performing
renormalization procedure in other theories, it seems reasonable to use some of
On-Mass-Shell renormalization scheme prescriptions.


title:
Implications for $B \to \eta K$ and $B \to Glueball + K$ Modes from
  Observed Large $B\to \eta' K+X$

abstract:
  The unexpectedly large branching ratios for $B\to \eta' K (\eta' X_s)$ decays
could be of gluonic origin. We study the implications for $B\to \eta K (\eta
X_s)$ and $P K (PX_s)$, where $P$ is the pseudoscalar glueball. In the
mechanism proposed by Fritzsch, large branching ratios are predicted for these
modes. The $B\to \eta K$ rate is barely within the experimental limit, and
$B\to P K$, $PX_s$ could be at the 0.1% and 1% level, respectively. Smaller but
less definite results are found for the mechanism of $g^* \to \eta' g$ via the
gluon anomaly.


title:
Spontaneous Generation of Pseudoscalar Mass in the U(3)xU(3) Linear
  Sigma Model

abstract:
  A novel, nonperturbative, way to generate chiral symmetry breaking within the
linear sigma model for 3 flavours is discussed. After spontaneous chiral
symmetry breaking in the vacuum at the tree level the scalar nonet obtains
mass, while the pseudoscalars are massless. Then, including quantum loops in a
nonperturbative, self-consistent way chiral symmetry is broken by nonplanar
graphs in a second step, and also the pseudoscalars become massive. By
interpreting the basic symmetry to be a discrete permutation symmetry, in
accord with superselection rules, no additional Goldstone bosons are expected.


title: The Quantum Field Theory of the Kaon Oscillations

abstract:
  We consider the covariant formulation of the kaon mixing in the context of
the propagator method. It results important to check the possibility of a
sizable effect in the vacuum regeneration of kaons. We discuss all those terms
which may give relevant contributions to modify the exponential decay law of
the Wigner-Weisskopf narrow width approximation. Moreover, we examine the
characteristic structure of the complex singularities of the matrix propagator
and we provide a generalized form of the Bell-Steinberger unitarity sum rule.


title:
Determination of V_cb from exclusive decays in a relativistic quark
  model

abstract:
  In the framework of a relativistic covariant Bethe-Salpeter model for the
quark-antiquark system we present a renewed determination of the
Cabbibo-Kobayashi-Maskawa matrix element $|V_{cb}|$. Complementing an earlier
analysis applied to the whole decay spectrum for $B\to D^* e\nu$ we now also
employ the ``zero-recoil method'' that uses the end point of the decay spectrum
($\omega=1$) and is suited for heavy-to-heavy transitions. The averaged
experimental value extracted from the data at zero recoil, $|V_{cb}|{\cal
F}(\omega=1)=0.0343\pm0.0015$, then leads to $|V_{cb}|=0.0360\pm 0.0016$. This
value is somewhat larger than the one that uses the whole decay spectrum for
the model analysis. We also contrast this result to a nonrelativistic model and
to recent experiments on the $B\to D e\nu$ semileptonic decay.


title:
Predictions for D^*+- Photoproduction at HERA with New Fragmentation
  Functions from LEP1

abstract:
  We present new sets of nonperturbative fragmentation functions for D^*+-
mesons, both at leading and next-to-leading order in the MS-bar factorization
scheme with five massless quark flavors. They are determined by fitting the
latest OPAL and ALEPH data on inclusive D^*+- production in e^+e^-
annihilation. We take the charm-quark fragmentation function to be of the form
proposed by Peterson et al. and thus obtain new values of the epsilon_c
parameter, which are specific for our choice of factorization scheme. With
these fragmentation functions, recent data on inclusive D^*+- photoproduction
in ep collisions at HERA are reasonably well reproduced.


title: Lattice Calculation of the Strangeness Magnetic Moment of the Nucleon

abstract:
  We report on a lattice QCD calculation of the strangeness magnetic moment of
the nucleon. Our result is $G_M^s(0) = - 0.36 \pm 0.20 $. The sea contributions
from the u and d quarks are about 80% larger. However, they cancel to a large
extent due to their electric charges, resulting in a smaller net sea
contribution of $ - 0.097 \pm 0.037 \mu_N$ to the nucleon magnetic moment. As
far as the neutron to proton magnetic moment ratio is concerned, this sea
contribution tends to cancel out the cloud-quark effect from the Z-graphs and
result in a ratio of $ -0.68 \pm 0.04$ which is close to the SU(6) relation and
the experiment. The strangeness Sachs electric mean-square radius $< r_s^2>_E$
is found to be small and negative and the total sea contributes substantially
to the neutron electric form factor.


title: Gluino Cascade Decays With Broken R--Parity

abstract:
  We study the pattern of gluino cascade decays in a class of supersymmetric
models where R-parity is spontaneously broken. The multi-lepton and same-sign
dilepton rates in these models are compared with those of the Minimal
Supersymmetric Standard Model. We show that these rates can be substantially
enhanced in models with broken R-parity.


title: Exclusive photoproduction of $\Phi$ on Proton in the quark-diquark model

abstract:
  We present predictions for the exclusive photoproduction of $\Phi$-meson on
Proton at large tranfer, where we use a quark-diquark structure model for the
proton. Extrapolation from our results to lower tranfers is comparable in
magnitude with available data in that range. This may support the diquark model
in its ability to provide, for that process, an appropriate link between
diffractive physics at low transfer and the standard semi-perturbative approach
of hard exclusive processes at very large tranfer, where the proton recovers
its three-quark structure.


title: The Top-Antitop Threshold at Muon Colliders

abstract:
  Muon colliders are expected to naturally have a small spread in beam energy
making them an ideal place to study the excitation curve. We present the
parameter determinations that are possible from measuring the total cross
section near threshold at a $\mu ^+\mu ^-$ collider.


title: Neutrino Mass and Missing Momentum Higgs Boson Signals

abstract:
  In the simplest scheme for neutrino masses invoking a triplet of Higgs
scalars there are two CP-even neutral Higgs bosons $H_i$ (i=1,2) and one
massive pseudoscalar $A$. For some choices of parameters, the lightest $H_1$
may be lighter than the Standard Model Higgs boson. If the smallness of
neutrino mass is due to the small value of the triplet expectation value, as
expected in a seesaw scheme, the Higgs bosons may decay dominantly to the
invisible neutrino channel. We derive limits on Higgs masses and couplings that
follow from LEP I precision measurements of the invisible Z width.


title: Fermion masses in SO(10) with a single adjoint Higgs field

abstract:
  It has recently been shown how to break SO(10) down to the Standard Model in
a realistic way with only one adjoint Higgs. The expectation value of this
adjoint must point in the B-L direction. This has consequences for the possible
form of the quark and lepton mass matrices. These consequences are explored in
this paper, and it is found that one is naturally led to consider a particular
form for the masses of the heavier generations. This form implies typically
that there should be large (nearly maximal) mixing of the mu- and
tau-neutrinos. An explanation that does not involve large tan beta also emerges
for the fact that b and tau are light compared to the top quark.


title: Dynamical Electro-Weak Symmetry Breaking with a Standard Model Limit

abstract:
  We argue that a Standard Model decoupling limit is generically the necessary
ingredient which makes scenarios of electro-weak symmetry breaking viable. This
applies especially also to models of dynamical electro-weak symmetry breaking.
Additional requirements are only that the mass predictions of a given model
(e.g. predictions or theoretical limits on the Higgs or top mass) are
consistent with existing data. We discuss the necessary ingredients for
dynamical symmetry breaking and present a dynamically broken
left-right-symmetric model as an example. The model exhibits such a decoupling
limit, is phenomenologically viable and leads to interesting mass predictions
and relations which are further examined.


title: Ordering Dynamics of Topological Defect Networks

abstract:
  I report on some work in progress on the dynamics of extended objects in
field theories after a rapid phase transition, as is relevant in the early
Universe. An analytic technique, originally introduced to approximate the
dynamics of topological defects in condensed matter systems, is extended to
cover relativistic objects. An exact formula for the area density of domain
walls in $D$ dimensions is derived.


title:
Supersymmetric Quantum Effects on the hadronic width of a heavy charged
  Higgs boson in the MSSM

abstract:
  We discuss the QCD and leading electroweak corrections to the hadronic width
of the charged Higgs boson of the MSSM. In our renormalization framework,
tan(beta) is defined through Gamma(H^+ -> tau^+ nu_{tau}). We show that a
measurement of the hadronic width of H^\pm and/or of the branching ratio of its
tau-decay mode with a modest precision of ~20% could be sufficient to unravel
the supersymmetric nature of H^\pm in full consistency with the low-energy data
from radiative B-meson decays.


title:
Chiral perturbation theory analysis of the baryon magnetic moments
  revisited

abstract:
  We reexamine critically the chiral expansion for the baryon magnetic moments
including the contributions from loops which involve intermediate octet and
decuplet baryons. We find that, contrary to some claims, the nonanalytic loop
contributions of orders $m_s^{1/2}$ and $m_s ln m_s$ are of the same general
size because of large coupling factors for the latter, and that the decuplet
contributions are as large as the octet contributions and must be included in a
consistent calculation. There is no clear evidence of the convergence of the
chiral series. The adequacy of the theory will not be established until
dynamical models are able to calculate the contributions from the counterterms
that largely hide the loop effects in fits to the data.


title:
Neutrino Mass Spectrum with $\nu_{\mu}$ $\to$ $\nu_s$ Oscillations of
  Atmospheric Neutrinos

abstract:
  We consider the ``standard'' spectrum of the active neutrinos (characterized
by strong mass hierarchy and small mixing) with additional sterile neutrino,
$\nu_s$. The sterile neutrino mixes strongly with the muon neutrino, so that
$\nu_{\mu} \leftrightarrow \nu_s$ oscillations solve the atmospheric neutrino
problem. We show that the parametric enhancement of the $\nu_{\mu}
\leftrightarrow \nu_s$ oscillations occurs for the high energy atmospheric
neutrinos which cross the core of the Earth. This can be relevant for the
anomaly observed by the MACRO experiment. Solar neutrinos are converted both to
$\nu_{\mu}$ and $\nu_s$. The heaviest neutrino ($\approx \nu_{\tau}$) may
compose the hot dark matter of the Universe. Phenomenology of this scenario is
elaborated and crucial experimental signatures are identified. We also discuss
properties of the underlying neutrino mass matrix.


title: Heavy Quark Hadroproduction in Perturbative QCD

abstract:
  Existing calculations of heavy quark hadroproduction in perturbative QCD are
either based on the approximate conventional zero-mass perturbative QCD theory
or on next-to-leading order (NLO) fixed-flavor-number (FFN) scheme which is
inadequate at high energies. We formulate this problem in the general mass
variable-flavor-number scheme which incorporates initial/final state heavy
quark parton distribution/fragmentation functions as well as exact mass
dependence in the hard cross-section. This formalism has the built-in feature
of reducing to the FFN scheme near threshold, and to the conventional zero-mass
parton picture in the very high energy limit. Making use of existing
calculations in NLO FFN scheme, we obtain more complete results on bottom
production in the general scheme to order \alpha_s^3 both for current
accelerator energies and for LHC. The scale dependence of the cross-section is
reduced, and the magnitude is increased with respect to the NLO FFN results. It
is shown that the bulk of the large NLO FFN contribution to the single
heavy-quark inclusive cross-section is already contained in the (resummed)
order \alpha_s^2 ``heavy flavor excitation'' term in the general scheme.


title: Four-Way Neutrino Oscillations

abstract:
  We present a four-neutrino model with three active neutrinos and one sterile
neutrino which naturally has maximal $\nu_\mu\to\nu_\tau$ oscillations of
atmospheric neutrinos and can explain the solar neutrino and LSND results. The
model predicts $\nu_e \to \nu_\tau$ and $\nu_e \to \nu_\mu$ oscillations in
long-baseline experiments with $L/E \gg 1$ km/GeV with amplitudes that are
determined by the LSND oscillation amplitude and argument controlled by the
atmospheric $\delta m^2$.


title: Heavy Baryon Chiral Perturbation Theory with Light Deltas

abstract:
  We demonstrate how heavy mass methods, previously applied to chiral
perturbation theory calculations involving the interactions of nucleons and
pions, can be generalized to include interactions with the $\Delta(1232)$ in a
systematic formalism which we call the "small scale expansion."


title: Intrinsic charm of light mesons and CP violation in heavy quark decay

abstract:
  We investigate the impact of the intrinsic heavy quark states on the
predicted values of CP asymmetries in the decays of heavy mesons. It is shown
that the intrinsic charm contribution, although dynamically suppressed in QCD,
is favored by the weak interaction, and therefore it can significantly dilute
the predicted values of CP-violating asymmetries. This introduces additional
non-perturbative uncertainty into the estimate of direct CP violating effects.
We provide a phenomenological estimate of intrinsic charm content of eta and
eta' mesons by expanding various amplitudes in terms of the heavy-light quark
mixing angle and discuss theoretical uncertainties in the estimates of direct
CP-violating asymmetries in B -> eta^(') K^(*).


title: New Physics and Enhanced Gluonic Penguin

abstract:
  We discuss the historical development of the gluonic B-penguin, its
sensitivity to $H^+$ effects, and $\bsg\sim$ 10--15% as a possible solution to
the $\Bsl$ and $n_C$ problems. The latter and the connection of the gluonic
penguin to inclusive $B\to \eta^\prime+ X_s$ production through the gluon
anomaly, with the intriguing prospect of 10% inclusive CP asymmetries, bring us
to topics of current interest.


title:
Tevatron Signatures of Long-lived Charged Sleptons in Gauge-Mediated
  Supersymmetry Breaking Models

abstract:
  In supersymmetric models with gauge-mediated supersymmetry breaking, charged
sleptons are the next lightest supersymmetric particles and decay outside the
detector for large regions of parameter space. In such scenarios, supersymmetry
may be discovered by searches for a number of novel signals, including highly
ionizing tracks from long-lived slow charged particles and excesses of
multi-lepton signals. We consider this scenario in detail and find that the
currently available Tevatron data probes regions of parameter space beyond the
kinematic reach of LEP II. Future Tevatron runs with integrated luminosities of
2, 10, and 30 fb-1 probe right-handed slepton masses of 110, 180, and 230 GeV
and Wino masses of 310, 370, and 420 GeV, respectively, greatly extending
current search limits.


title:
Classical antiparticles, quantum supersymmetry anomaly and constituent
  models

abstract:
  The two ways of constrained systems quantization are considered from the
point of view of their self-consistency at the quantum level. With a
transparent example of a particle in the external electromagnetic field we
demonstrate that the procedure of gauge fixing turns out rather dangerous and
may lead to a quantum anomaly in the operator algebra. We discuss additional
classical symmetries as an essential element for tracing out this anomaly. The
two cases of a spinning and a spinless particles in the external
electromagnetic field are discussed to illustrate the situation.


title:
Spontaneous CP violation and Higgs spectrum in a Next to Minimal
  Supersymmetric Model

abstract:
  We explore the possibility of spontaneous CP violation within the Next to
Minimal Supersymmetric Standard Model. In the most general form of the model,
without a discrete $Z_3$ symmetry, we find that even at tree level spontaneous
CP violation can occur, while also permitting Higgs masses consistent with
experiment.


title: Determination of the angle gamma using B -> D* V modes

abstract:
  We propose a method to determine the angle $\gamma=arg(V_{ub})$, using the
$B\to D^*V$ ($V=K^*, \rho$) modes. The $D^*$ is considered to decay to $D \pi$.
An interference of the $B \to D^{*0}V$ and $B \to \bar {D^{*0}}V$ amplitudes is
achieved by looking at a common final state $f$, in the subsequent decays of
$D^0/\bar{D^0}$. A detailed analysis of the angular distribution, allows
determination, not only of $\gamma$ and $|V_{ub}|$, but also all the hadronic
amplitudes and strong phases involved. No prior knowledge of doubly Cabibbo
suppressed branching ratios of $D$ are required. Large CP violating asymmetries
($\sim30 %$ for $\gamma=30^o$) are possible if $\bar{D^0} \to f$ is doubly
Cabbibo suppressed, while $D^0 \to f$ is Cabbibo allowed, for decays of $B^+$
or $B^0$.


title:
The action for the (propagating) torsion and the limits on the torsion
  parameters from present experimental data

abstract:
  Starting from the well established form of the Dirac action coupled to the
electromagnetic and torsion field we find that there is some additional softly
broken local symmetry associated with torsion. This symmetry fixes the form of
divergences of the effective action after the spinor fields are integrated out.
Then the requirement of renormalizability fixes the torsion field to be
equivalent to some massive pseudovector and its action is fixed with accuracy
to the values of coupling constant of torsion-spinor interaction, mass of the
torsion and higher derivative terms. Implementing this action into the abelian
sector of the Standard Model we establish the upper bounds on the torsion mass
and coupling. In our study we used results of present experimental limits on
four-fermion contact interaction (LEP, HERA, SLAC, SLD, CCFR) and TEVATRON
limits on the cross section of new gauge boson, which could be produced as a
resonance at high energy $p\bar{p}$ collisions.


title: The lightest scalar glueball

abstract:
  Recently performed investigations of meson spectra allow us to determine the
resonance structure for the waves $IJ^{PC}=00^{++}$, $10^{++}$, $02^{++}$,
$12^{++}$ = $IJ^P= 1/2 0^+$ in the mass region up to 1900 MeV, thus
establishing the meson multiplets $1^3P_0q\bar q$ and $2^3P_0q\bar q$.
Experimental data demonstrate that there are five scalar/isoscalar states in
this mass region. Four of them are $q\bar q$ states, that is, members of the
$1^3P_0q\bar q$ and $2^3P_0q\bar q$ nonets, while the fifth state is an extra
one not accomodated by $q \bar q$ systematics; it has the properties of the
lightest scalar glueball. Analysis of the $00^{++}$-wave performed within the
framework of the dispersion relation technique allows us to reconstruct the
mixing of a pure gluonium with neighbouring scalar $q \bar q$ states belonging
to $1^3P_0q\bar q$ and $2^3P_0q\bar q$ nonets: three scalar mesons share the
gluonium state between each other -- those are two comparatively narrow
resonances $f_0(1300)$ and $f_0(1500)$ and a broad resonance
$f_0(1530^{+90}_{-250})$. The broad state is a descendant of the gluonium,
keeping about 40-50% of its component.


title: QCD and the Hadronic Final State in Deep Inelastic Scattering at HERA

abstract:
  The measurements of the hadronic final state in deep inelastic scattering at
HERA are reviewed and discussed in the context of QCD. Covered are the general
event properties in terms of energy flows, charged particle production, and
charm and strangeness production. Quark fragmentation properties are studied in
the Breit frame. Event shape measurements allow "power corrections" to be
applied and the strong coupling alpha_s to be extracted. Other alpha_s
measurements are based on dijet rates. Jet rates as well as charm production
have been used to determine the gluon density in the proton. Indications have
been found in the hadronic final state for unconventional, non-DGLAP evolution
at small x, which could be explained with BFKL evolution. Signatures for QCD
instanton effects are discussed and first search results are presented.


title:
Renormalization of nonequilibrium dynamics at large N and finite
  temperature

abstract:
  We generalize a previously proposed renormalization and computation scheme
for nonequilibrium dynamics to include finite temperature and one-loop
selfconsistency as arising in the large-N limit. Since such a scheme amounts
essentially to tadpole summation, it also includes, at high temperature, the
hard mass corrections proportional to T^2. We present some numerical examples
at T=0 and at finite temperature; the results reproduce the essential features
of other groups. Especially, we can confirm a recently discovered sum rule for
the late time behaviour.


title:
A polarised QCD condensate: nu p elastic scattering as a probe of U_A(1)
  dynamics

abstract:
  U_A(1) dynamics have the potential to induce a polarised condensate inside a
nucleon. The formation of this condensate is related to the realisation of
U_A(1) symmetry breaking by tunneling processes such as instantons. If it is
present, the polarised condensate induces a term in g_1 which has support only
at x=0. Tunneling processes then induce a net transfer of ``spin'' from finite
x to x=0. The polarised condensate may be measured by comparing the
flavour-singlet axial charges which are extracted from polarised deep inelastic
and nu p elastic scattering experiments.


title: Hard Leptoproduction of Charged Vector Mesons

abstract:
  We present an analysis of twist-2, leading order QCD amplitudes for hard
exclusive leptoproduction of charged vector mesons. These processes are
determined by nonforward parton distribution functions which are nondiagonal in
quark flavor. We derive relations between flavor diagonal and nondiagonal
distribution functions based on isospin symmetry. Furthermore, we discuss
general features of rho^+ and rho^- production cross sections, and present
estimates based on a simple model for nonforward distribution functions.


title:
The equivalence between the color dipole model and the BFKL Pomeron at
  leading order

abstract:
  We compute the onium-onium scattering amplitude at fixed impact parameter in
the framework of the perturbative QCD dipole model. Relying on the conformal
properties of the dipole cascade and of the elementary dipole-dipole scattering
amplitude, we obtain an exact result for this onium-onium scattering amplitude,
which is proved to be identical to the BFKL result, and which is frame
invariant. The asymptotic expression for this amplitude at fixed impact
parameter agrees with previous numerical simulations.


title: Lepton Flavor Violation and Fermion Masses

abstract:
  Lepton flavor violation may be a signature of "GUT scale" physics, if the
messenger scale for SUSY breaking is above the "GUT scale." We elaborate on the
details of this simple statement in the following talk.


title:
On Electroweak Moments of Baryons and Spin-Flavour Structure of the
  Nucleon

abstract:
  The phenomenological sum-rule-based approach is used to discuss the quark
composition dependence of some static and quasi-static electroweak
characteristics of nucleons.The role of nonvalence degrees of freedom, the
nucleon sea partons and/or peripheral meson currents, is shown to be important
to select and make use of the relevant symmetry parametrization of hadron
observables. With our preferable universal value of the SU(3)-symmetry
parameter $\alpha_{D}=D/F+D=.58$, taken for both magnetic moments and
axial-vector constants entering into the semi-leptonic baryon decays, we obtain
the following values for moments $\Delta q$ of the spin-dependent structure
function of the proton: $\Delta u \simeq .84(.82), \Delta d \simeq -.42(-.44),
\Delta s=-.22 \pm .05 (-.10 \pm .03)$, where the values in parentheses
correspond to the widely used "standard" value of $\alpha^{axial}_{D}=.63$. The
estimations of the strange sea contributions to the nucleon magnetic moments
and rms are also presented.


title: Top Quark Physics: Overview

abstract:
  In this presentation I will primarily focus on top quark physics but I will
include a discussion of the W-boson mass and the possibility of discovering a
light Higgs boson via associated production at the Tevatron.


title: Proposals for Studying TeV $WW \to WW$ Interactions Experimentally

abstract:
  We discuss how to experimentally study the electroweak symmetry breaking
(EWSB) sector by observing $WW \to WW$ interactions in the TeV region. We
discuss some general features of the event structure in the signal and the
background events. Various techniques to enhance the signal-to-background ratio
are also presented. We show how to detect longitudinal W-bosons either in the
central rapidity region of the detector or in the beam pipe direction. Finally,
we globally classify the sensitivities of the Large Hadron Collider and the
Linear Colliders to probing the next-to-leading order bosonic operators of the
electroweak chiral lagrangian used to parametrize models of strongly coupled
EWSB sector.


title: New Glueball-Meson Mass Relations

abstract:
  Using the ``glueball dominance'' picture of the mixing between q\bar{q}
mesons of different hidden flavors, we establish new glueball-meson mass
relations which serve as a basis for glueball spectral systematics. For the
tensor glueball mass 2.3\pm 0.1 GeV used as an input parameter, these relations
predict the following glueball masses: M(0^{++})\simeq 1.65\pm 0.05 GeV,
M(1^{--})\simeq 3.2\pm 0.2 GeV, M(2^{-+})\simeq 2.95\pm 0.15 GeV,
M(3^{--})\simeq 2.8\pm 0.15 GeV. We briefly discuss the failure of such
relations for the pseudoscalar sector. Our results are consistent with
(quasi)-linear Regge trajectories for glueballs with slope \simeq 0.3\pm 0.1
GeV^{-2}.


title: Sneutrino Cold Dark Matter With Lepton-Number Violation

abstract:
  The tau sneutrino is proposed as a candidate for galactic halo dark matter,
and as the cold dark matter (CDM) component of the universe. A
lepton-number-violating sneutrino mass, \tilde{\nu}\tilde{\nu}, splits the tau
sneutrino into two mass eigenstates: \tilde{\nu} \rightarrow \tilde{\nu}_\pm.
The absence of a Z \tilde{\nu}_- \tilde{\nu}_- coupling implies that the
lighter mass eignestate, \tilde{\nu}_-, does not annihilate via the s-channel
Z-exchange to a low cosmological abundance, and furthermore, halo sneutrinos do
not scatter excessively in Ge detectors. For the majority of the relevant
parameter space, the event rate in Ge detectors is \geq 10^{-2} events/kg/day.
The lepton number violation required for sneutrino CDM implies that the tau
neutrino mass is m_{\nu_\tau} \gtrsim 5 MeV, large enough to be excluded by B
factory experiments. Events of the form l^+ l^- \not E or jj \not E , with low
m_{ll} or m_{jj}, may be observed at LEP2. A seesaw mechanism is investigated
as the origin for the lepton number violation, and several other cosmological
and particle physics consequences of sneutrino CDM are discussed.


title:
A Family--Universal Anomalous U(1) in String Models as the Origin of
  Supersymmetry Breaking and Squark Degeneracy

abstract:
  Recently a promising mechanism for supersymmetry breaking that utilizes both
an anomalous U(1) gauge symmetry and an effective mass term m ~ 1TeV of certain
relevant fields has been proposed. In this paper we examine whether such a
mechanism can emerge in superstring derived free fermionic models. We observe
that certain three generation string solutions, though not all, lead to an
anomalous U(1) which couples universally to all three families. The advantages
of this three-family universality of $U(1)_A$, compared to the two-family case,
proposed in earlier works, in yielding squark degeneracy, while avoiding
radiative breaking of color and charge, are noted. The root cause of the flavor
universality of $U(1)_A$ is the cyclic permutation symmetry that characterizes
the $Z_2\times Z_2$ orbifold compactification with standard embedding, realized
in the free fermionic models by the NAHE set. It is shown that
non--renormalizable terms which contain hidden--sector condensates, generate
the required suppression of the relevant mass term $m$, compared to the Planck
scale. While the D-term of the family universal $U(1)_A$ leads to squark
degeneracy, those of the family dependent U(1)'s, remarkably enough, are found
to vanish for the solutions considered, owing to minimization of the potential.


title: The $F_2$ slope and shadowing corrections in DIS

abstract:
  Recent HERA low $Q^2$ data show that the logarithmic slope of the
protonstructure function ($\frac{\partial F_2}{\partial \ln Q^2}$) is
significantly different from perturbative QCD expectations for smallvalues of
$Q^2$ at exeedingly small values of $x$. We show that shadowing (screening)
corrections provide a natural explanation for this experimental observation.


title: The Structure of the Photon in Hard Hadronic Processes

abstract:
  The concept of the structure of the photon is discussed and the progress in
the measurement of various structure functions of the photon as well of parton
distributions in the photon is shortly reviewed.


title: Evidence for no shrinkage in elastic photoproduction of J/Psi

abstract:
  The differential cross section dsigma/dt of elastic photoproduction of J/Psi
at different gamma p center of mass energies W are used to determine the
properties of the exchanged trajectory in the reaction gamma p --> J/Psi p. In
the region |t| < 1 GeV^2, the resulting trajectory is alpha(t) = (1.153 \pm
0.027) + (-0.001 \pm 0.072)t. The vanishing value of the slope of the
trajectory is an experimental evidence for no shrinkage and thus for the
perturbative nature of the exchange.


title: Supersymmetric theories with explicit R-parity violation

abstract:
  $R_p$ and motivation for explicit $R\!\!\!/}_p$, MSSM $\rightarrow$ $
R\!\!\!/}_p$ MSSM, Bounds on ${R\!\!\!/}_p$ couplings, Collider-specific
phenomenology, Cosmological implications, Summary and outlook, References


title: Emission of electron density waves by neutrinos in a dense medium

abstract:
  We study the production of electron density waves by neutrinos propagating
through a plasma. We treat this process in field theoretically as a Cerenkov
emission of phonons (quanta of electron density waves) by neutrinos. We compute
the energy transfered to the plasma by the neutrinos and apply it to the shock
wave revival problem of supernovae.


title:
The Excess of HERA High$-Q^2$ Events and Leptoquarks in a Left-Right
  Symmetric Preon Model

abstract:
  An interpretation that the HERA excess events are due to intermediate
production and decay of composite leptoquarks in the left-right symmetric preon
model is given. Because of the preon-line rule, expected to be valid well, the
event-ratio of neutral to charged current interactions is predicted to be one.


title:
Semiclassical Approximation for Non-Abelian Field Strength Correlators
  in the Instanton Dilute Gas Model

abstract:
  Field strength correlators are semi-classically evaluated in the dilute gas
model of non-Abelian sources (instantons) and compared with lattice data for
QCD at zero temperature. We show that one of the Euclidean invariant, tensorial
structures vanishes for configurations being purely selfdual or anti-selfdual.
We compute the invariant functions contributing to the correlators within the
two lowest orders in an instanton density expansion. Fitting instanton size and
density for quenched and full QCD, we obtain a reasonable description.


title: The Landau-Pomeranchuk-Migdal effect in a thin target

abstract:
  The Landau, Pomeranchuk, Migdal (LPM) effect (suppression of the
bremsstrahlung from high energy electron due to a multiple scattering of an
emitting electron in dense media) is considered for the case when thickness of
a target is of the order or less than the formation length of radiation. The
effects of the polarization of a medium and transition radiation are taken into
account as well. Qualitative picture of the phenomenon is discussed in detail.
Comparison with recent experimental data is carried out.


title: Chiral Perturbation Theory for Nuclear Physicists

abstract:
  Chiral perturbation theory is the low energy effective theory of the strong
interactions for the light pseudoscalar degrees of freedom. This program is
based on effective Lagrangian techniques and is an expansion in the powers of
the momenta and the powers of the quark masses, which correct the soft-pion
theorems. After briefly reviewing these features and some results, we address
the implications of this program to $\pi-N$ scattering, the $\pi-N$ sigma term
and some recent investigations of the implications of chiral symmetry to
nucleon-nucleon forces. We finally look at the implications of chiral
perturbation theory to hadron mass relations.


title: On decay of bubble of disoriented chiral condensate

abstract:
  We discuss the space-time structure for the process of decay of a bubble of
hypothetic phase -- disoriented chiral condensate (DCC). The evolution of the
initial classical field configuration corresponding to the bubble of DCC is
studied both numerically and analytically. The process of decay of this initial
configuration depends crucially on selfinteraction of the pionic fields. It is
shown that in some cases this selfinteraction leads to the formation of sort of
breather solution, formed from pionic fields situated in the center of the
initial bubble of DCC. This breather looks like a long-lived source of pionic
fields.


title:
Solution of $a_2/a_1$ sign problem in heavy meson decays:
  nonfactorizable soft gluons in nonleptonic heavy meson decays

abstract:
  For the first time, a solution to the $a_2/a_1$ sign problem in heavy meson
decay based on PQCD factorization theorems. The point is to include QCD
evolution effort characteristic scales involved in decay processes.


title: Baryon Chiral Perturbation Theory in Partially Quenched Large-Nc QCD

abstract:
  Baryons of lower spin in partially quenched large-$N_c$ QCD are studied with
particular emphasis to interpolation between standard unquenched and fully
quenched limits. In large $N_c$ limit of partially quenched QCD, we calculate
$\Delta m$, the chiral one-loop correction to baryon masses. We find that
leading order contribution to $\Delta m$ is independent of number of ghost
quarks introduced. For finite $N_c$, chiral correction $\Delta m$ does satisfy
the Bernard--Golterman's third theorem and has no infared quenching singularity
except for fully quenched limit. At large $N_c$ limit, however, we show that
the third theorem is bypassed and nontrivial quenched chiral corrections do
arise. In unquenched limit, we also show that standard chiral perturbation
theory results are reproduced in which $\eta'$ loop contributions are
explicitly taken into account.


title: Model-independent $\tan \beta$ bounds in the MSSM

abstract:
  We demonstrate, through the study of the one-loop effective potential in the
MSSM, the existence of fully model-independent lower and upper theoretical
bounds on $\tan \beta$. We give their general analytic form and illustrate some
of their implications.


title: Quark and Lepton Mass Matrix in an Asymptotically Non-Free Theory

abstract:
  We analyze fermion mass-matrix structure in an asymptotically non-free model
with 4 + 1bar generations. The texture at the GUT scale is uniquely determined
by supposing that the masses of heavy up-type quarks (charm as well as top) are
realized as their infrared fixed point values. By assuming SO(10) GUT-like
relations for Yukawa couplings in this model, this texture can explain all
fermion masses and quark mixing with only one small parameter, which is almost
equal to the Cabibbo angle.


title: Measuring Arg($V_{ub}$) in $B\to K\pi$

abstract:
  It has previously been shown that a measurement of Arg$(V_{ub})=\gamma$ can
be obtained from a triangle construction using ${\cal B}(B^0\to K^+\pi^-)$,
${\cal B}(\bar{B^0}\to K^-\pi^+)$, ${\cal B}(B^\pm\to K^0_s\pi^\pm)$, and
${\cal B}(B^\pm\to \pi^\pm\pi^0)$. We evaluate experimental as well as
theoretical uncertainties in this measurement. We find that a measurement of
$\gamma $ with the next generation of B-factories (BaBar, BELLE, CLEO III) is
statistics rather than theory limited if soft rescattering effects are small.


title:
Lepton flavor violation at linear collider experiments in supersymmetric
  grand unified theories

abstract:
  Lepton flavor violation at linear collider experiments is discussed. We show
that detectable lepton flavor violation could occur through scalar lepton pair
production and decay in the supersymmetric SU(5) grand unified theory in spite
of the stringent present experimental constraints by rare process searches.
Possible cross sections about 40fb for an e+e- collider and 280fb for an e-e-
collider are illustrated.


title:
Novel Scaling Behavior for the Multiplicity Distribution under
  Second-Order Quark-Hadron Phase Transition

abstract:
  Deviation of the multiplicity distribution $P_q$ in small bin from its
Poisson counterpart $p_q$ is studied within the Ginzburg-Landau description for
second-order quark-hadron phase transition. Dynamical factor $d_q\equiv
P_q/p_q$ for the distribution and ratio $D_q\equiv d_q/d_1$ are defined, and
novel scaling behaviors between $D_q$ are found which can be used to detect the
formation of quark-gluon plasma. The study of $d_q$ and $D_q$ is also very
interesting for other multiparticle production processes without phase
transition.


title: Local duality for the $\rho$-meson width revisited

abstract:
  Local duality estimates for the $\rho$-meson leptonic width and the spectrum
of radial excitations are updated. New perturbative corrections are included in
the analysis that gives good agreement with experimental data on low energy
resonances.


title: Bilinear R-parity Violation in Neutrinoless Double Beta Decay

abstract:
  We discuss some phenomenological issues of the effective quark-lepton
operators emerging from the bilinear lepton-Higgs couplings in the
superpotential and in the soft supersymmetry (SUSY) breaking sector of the
supersymmetric models without R-parity. The contribution of these operators to
the neutrinoless double beta decay is derived. The corresponding nuclear matrix
elements are calculated within the renormalized quasiparticle random phase
approximation, which includes the Pauli effect of fermion pairs and does not
collapse for the physical values of the nuclear force strength. On this basis
we extract from the experimental data new stringent limits on the 1st
generation mass parameter characterized the lepton-Higgs bilinear coupling and
on the electron sneutrino vacuum expectation value.


title: Some aspects of the BFKL evolution

abstract:
  I review the recent progress in small $x$ physics, concentrating on the
topics relevant to the BFKL evolution.


title:
Long-baseline neutrino oscillation experiments and CP violation in the
  lepton sector

abstract:
  We discuss possibilities to investigate the effects of CP (and T) violation
in the lepton sector in neutrino oscillation experiments. We consider the
effects of CP violation in the framework of two schemes of mixing of four
massive neutrinos that can accommodate the results of all neutrino oscillation
experiments. Using the constraints on the mixing parameters that follow from
the results of short-baseline neutrino oscillation experiments, we derive
rather strong upper bounds on the effects of CP violation in nu_mu<->nu_e
transitions in long-baseline neutrino oscillation experiments. We show that the
effects of CP violation in nu_mu<->nu_tau transitions in long-baseline
oscillation experiments can be as large as is allowed by the unitarity of the
mixing matrix. The matter effects, which complicate the problem of searching
for CP violation in long-baseline experiments, are discussed in detail. We
consider the T-odd asymmetries whose measurement could allow to reveal T and CP
violation in the lepton sector independently from matter effects.


title: Dark Matter: Motivation, Candidates and Searches

abstract:
  The physical nature of most of the gravitating mass in the universe is
completely mysterious. The astrophysical evidence for the presence of this dark
matter and astrophysical constraints on its properties will be reviewed. The
most popular dark-matter candidates will be introduced, and current and future
attempts to search for them directly and indirectly will be discussed.


title: The Structure of Hadrons

abstract:
  Recent experimental results contributing to the understanding of the
structure of the nucleon are reviewed. They include the final NMC results on
proton and deuteron structure functions; a re-analysis of the CCFR data on F2
and xF3; new preliminary results from CDF on charge asymmetry in W production,
from E866 on Drell-Yan mu-pair production and from E706 on prompt photon
production. New results from HERA on F2, on the gluon density at low x, on the
charm contribution F2(ccbar), on a determination of FL and on measurements in
the very low Q2 region are discussed.


title: Future probes of the origin of CP violation

abstract:
  We review what has been learned about CP violation in the K system. It is
natural to hypothesize that the observed CP-violating effects are caused by the
Standard Model weak interaction. We describe the stringent future test of this
hypothesis via experiments on the B system. Then, we see how new physics beyond
the Standard Model could be revealed by this test.


title: Perturbative pion form factor reexamined

abstract:
  We recalculate the pion electromagnetic form factor based on the perturbative
QCD formalism that includes the Sudakov resummation. We take into account the
evolution of the pion wave function in $b$, which represents the transverse
extent of the pion. An infrared enhancement is observed when $1/b$ approaches
$\Lambda_{QCD}$. We propose to freeze the evolution of the wave function at
some scale above $\Lambda_{QCD}$, such that perturbative contributions are
stablized. Our predictions are consistent with experimental data, and
insensitive to the variation of relevant parameters.


title: Renormalisation Invariance and the Soft $\beta$-Functions

abstract:
  We demonstrate that the soft supersymmetry-breaking terms in a N=1 theory can
be linked by simple renormalisation group invariant relations which are valid
to all orders of perturbation theory. In the special case of finite N=1
theories, the soft terms preserve finiteness to all orders.


title:
A connection between inclusive semileptonic decays of bound and free
  heavy quarks

abstract:
  A relativistic constituent quark model, formulated on the light-front, is
used to derive a new parton approximation for the inclusive semileptonic decay
width of the B-meson. A simple connection between the decay rate of a free
heavy-quark and the one of a heavy-quark bound in a meson or in a baryon is
established. The main features of the new approach are the treatment of the
b-quark as an on-mass-shell particle and the inclusion of the effects arising
from the b-quark transverse motion in the B-meson. In a way conceptually
similar to the deep-inelastic scattering case, the B-meson inclusive width is
expressed as the integral of the free b-quark partial width multiplied by a
bound-state factor related to the b-quark distribution function in the B-meson.
The non-perturbative meson structure is described through various quark-model
wave functions, constructed via the Hamiltonian light-front formalism using as
input both relativized and non-relativistic potential models. A link between
spectroscopic quark models and the B-meson decay physics is obtained in this
way. Our predictions for the B -> X_c l nu_l and B -> X_u l nu_l decays are
used to extract the CKM parameters |V_cb| and |V_ub| from available inclusive
data. After averaging over the various quark models adopted and including
leading-order perturbative QCD corrections, we obtain |V_cb| = (43.0 +/-
0.7_exp +/- 1.8_th) 10^-3 and |V_ub| = (3.83 +/- 0.48_exp +/- 0.14_th) 10^-3,
implying |V_ub / V_cb| = 0.089 +/- 0.011_exp +/- 0.005_th, in nice agreement
with existing predictions.


title: Light $q\bar{q}$ Resonances: Spectrum and Decays

abstract:
  I give a brief introduction to light $q\bar{q}$ resonances. The properties of
$q\bar{q}$ states are discussed in the context of the constituent quark model,
including predictions for mass and partial decay widths. Problems and puzzles
in the meson spectrum are pointed out with an emphasis on how an 8+ GeV photon
beam can address these. I also point out some areas where I believe theoretical
study would be useful.


title: Strangeness, Charm, and Beauty: Mesons with One Heavy Quark

abstract:
  I review the properties of mesons with one heavy quark. I start by examining
the predicted masses and widths in the context of the quark model and heavy
quark effective theory. Some recent experimental results are described and I
conclude with comments on potentially interesting future experimental studies.


title: The Evolution of Unpolarized Singlet Structure Functions at Small x

abstract:
  A systematic study is performed of the impact of the various resummed
small-$x$ contributions to the anomalous dimensions and coefficient functions
on the evolution of unpolarized structure functions in deep-inelastic
scattering. The proton structure functions $F_2^p$ and $F_L^p$ as well as the
photon structure function $F_2^{\gamma}$ are considered together with the
corresponding parton densities. The general analytic solution of the evolution
equations in Mellin-$N$ space is derived, and different approximate solutions
are compared. Potential effects of less singular small-$x$ terms in the
anomalous dimension and coefficient functions are discussed.


title: Virtual Supersymmetric Corrections in e^+e^- Annihilation

abstract:
  Depending on their masses, Supersymmetric particles can affect various
measurements in Z decay. Among these are the total width (or consequent
extracted value of $\alpha_s$), enhancement or suppression of various flavors,
and left-right and forward-backward asymmetries. The latter depend on squark
mass splittings and are, therefore, a possible test of the Supergravity related
predictions. We calculate leading order corrections for these quantities
considering in particular the case of light photino and gluino where the SUSY
effects are enhanced. In this limit the effect on $\alpha_s$ is appreciable,
the effect on $R_b$ is small, and the effect on the asymmetries is extremely
small.


title: Astro-Particle Physics

abstract:
  Recent developments of those areas of astro-particle physics are discussed
that were represented at the HEP97 conference. In particular, the current
status of direct and indirect dark-matter searches and of TeV neutrino and
gamma-ray astronomy will be reviewed.


title: Instanton-anti-instanton molecule with non-zero-modes of quarks included

abstract:
  A straightforward algebraic derivation is carried out of light quark
propagator and effective action in the instanton-anti-instanton molecule. Exact
expressions are obtained which contain contributions of all quark modes.
Possible implications of the results include chiral phase transition and
correlation functions of mesons and baryons.


title: Sleptons in R-Parity Violating SUSY

abstract:
  In R-parity violating SUSY models sleptons can be produced singly in e+e- and
qqbar collisions. The formation of slepton resonances at LEP2 or Tevatron at
current energies is an exciting possibility. Existing LEP2 and Tevatron data
can be exploited to look for sleptons and, if unsuccessful, to derive bounds on
the Yukawa couplings of sleptons to quark and lepton pairs.


title: Supersymmetry and Large Scale Left-Right Symmetry

abstract:
  We show that the low energy limit of the minimal supersymmetric Left-Right
models is the supersymmetric standard model with an exact R-parity. The theory
predicts a number of light Higgs scalars and fermions with masses much below
the $B-L$ and $SU(2)_R$ breaking scales. The non-renormalizable version of the
theory has a striking prediction of light doubly charged supermultiplets which
may be accessible to experiment. Whereas in the renormalizable case the scale
of parity breaking is undetermined, in the non-renormalizable one it must be
bigger than about $10^{10} - 10^{12}$ GeV. The precise nature of the see-saw
mechanism differs in the two versions, and has important implications for
neutrino masses.


title: A Model of Composite Quarks and Leptons

abstract:
  In continuation of our model of composite electron, its companion neutrinos,
photon and electro-weak gauge bosons as well as their super-partners based on
extended Lorentz group $SU(3)\otimes SU(3)$ in (8+1) dimensional space-time, we
show that the remaining leptons, quarks, lepto-quarks and gluons as well as
their respective super-partners can be considered as composites of fundamental
particles belonging to the $5\otimes 5$ dimensional representation of the
further extended Lorentz group $SU(5)\otimes SU(5)$ in (24+1) dimensional
space-time. The fundamental particles constituting the composite ones do not
posses quantum numbers of the latter such as charge, hypercharge etc. Since
according to our estimate based on experimental limit on the electron
life-time, the mass of the fundamental particles is in the Planckian regime,
the composite particles would break up into their constituents at these
energies and lose their quantum numbers.


title: B Physics - A Theoretical Review

abstract:
  This overview of what we can hope to learn from high-statistics experiments
in B physics in the next few years includes: (a) a review of parameters of the
Cabibbo-Kobayashi-Maskawa (CKM) Matrix; (b) direct determination of magnitudes
of CKM elements; (c) forthcoming information from studies of kaons; (d) CP
violation in B decays; (e) aspects of rate measurements; (f) the role of
charm-anticharm annihilation; (g) remarks on tagging; and (h) effects beyond
the standard model.


title: Rare Decays of \psi and \Upsilon

abstract:
  We study two-body weak hadronic decays of \psi and Upsilon employing the
factorization scheme. Branching ratios for \psi -> PP/PV and \Upsilon -> PP/PV
decays in the Cabibbo-angle-enhanced and Cabibbo-angle-suppressed modes are
predicted.


title: A Model of Composite Electrons and Photons

abstract:
  It is shown that electrons and photons can be considered as composities of
particles representating the fundamental representation of the extended Lorentz
group $SU(3)\otimes SU(3)$ in (8+1) dimensional space-time which are held
together by force mediated by gauge particles belonging to the regular
representation. In this theory, spin states of electron, positron and photon
belong to the $8\otimes 8$ representation of the group. The fine structure
constant of the fundamental gauge interaction is found to be unity from the
fact that the photon is massless. The mass of the fundamental particles
constituting the electron and the photon is estimated to be $\geq 10^{21}$ GeV
from the experimental limit for the life-time of electron decay into neutrino
and photon which is a consequence of the model. This corresponds to distances
of less than $10^{-35}$ cm which is smaller than the Planck length indicating
thereby that the composite nature of electrons and photons will be revealed
when we go to Planckian energies.


title: A Nonperturbative Measurement of the Broken Phase Sphaleron Rate

abstract:
  We develop a method to compute the sphaleron rate in the electroweak broken
phase nonperturbatively. The rate is somewhat slower than a perturbative
estimate. In SU(2) X U(1) Higgs theory at the physical value of Theta_W, and
assuming that the latent heat of the phase transition reheats the universe to
the equilibrium temperature, baryon number erasure after the phase transition
is prevented only when lambda/g^2 <= 0.036.


title: Perturbative Duality in the Resonance Spin Structure Functions

abstract:
  We investigate the relations between the spin structure functions in the
scaling and resonance regions. We examine the possible duality between the two,
and draw inferences for the behavior of the asymmetry A_1 at large x. Finally,
we point out the importance of additional polarized structure function data in
the resonance region in terms of testing the hysteresis of perturbative
physics.


title: Probing flavor changing interactions in photon-photon collisions

abstract:
  We examine the subprocess $\gamma\gamma \to t\bar{c}+\bar{t}c$ at
electron-positron colliders in the two-Higgs-doublet model with flavor-changing
scalar couplings, where all the one-loop contribuions are considered, and the
results are applicable to the whole mass range of the weakly coupled Higgs
bosons. Because of the heavy top quark mass, this process is important in
probing the flavor-changing top-charm-scalar vertex and could be detectable at
the Next Linear Collider, if the values of the parameters are favorable. The
results show that this process is more promising than the direct $e^{+} e^{-}$
process for discovering flavor changing scalar interactions.


abstract:
  The interaction of dyons in the mean field approximation is considered. The
result of interaction is the mass term for dyonic field in the effective
Lagrangian. Due to the mass term the profile function of dyon falls off
exponentially at large distances.


title:
Analytic approach to the complete set of QED corrections to fermion pair
  production in e+e- annihilation

abstract:
  We present the convolution integral for fermion pair production in the
electroweak standard theory to order O(alpha) including also soft photon
exponentiation. The result is complete in the sense that it includes initial
and final state radiation and their interference. From the basic result -
analytic formulae for the differential cross section - we also derive the
corresponding expressions for total cross section and integrated
forward-backward asymmetry. The numerical importance of different contributions
for the analysis of experiments at LEP/SLC energies is discussed.


title:
QED corrections with partial angular integration to fermion pair
  production in e+e- - annihilation

abstract:
  Analytic formulae are derived for the complete photon energy spectrum due to
QED corrections to fermion pair production in case of a limited angular
acceptance for the final state fermions. After a numerical integration over the
energy of non-observed photons, this corresponds to typical experimental
conditions at LEP/SLC.


title:
$\rho^0-\omega$ mixing in U(3)}$_L\times$ U(3)$_R$ chiral theory of
  mesons

abstract:
  In this paper, U(3)$_L\times$ U(3)$_R$ chiral theory of mesons is extended to
the leading order in quark mass expansion in order to evaluate the
$\rho^0-\omega$ mixing. It is shown that the use of path integral method to
integrate out the quark fields naturally leads to the $\rho^0-\omega$ mixing
vertices, and this mixing is entirely from the quark loop in this theory. The
off-shell behaviour of the mixing amplitude is analyzed. The on-shell mixing
amplitude is obtained from the decay $\omega\to \pi^+\pi^-$. Furthermore, the
constraints on the light quark mass parameters are extracted from the
$\rho^0-\omega$ mixing and the mesons masses, and the mass splitting of
$K^*(892)$-mesons is predicted.


title: Backreactions in Superinflationary Cosmologies

abstract:
  We examine Jordan-Brans-Dicke theories with a linear potential for the scalar
field by means of a stochastic approach. The backreaction of the scalar field
fluctuations on the classical background is described. The analysis is
concentrated on those values of the Jordan-Brans-Dicke parameter which predict
a superinflationary pre-big-bang branch. The graceful exit problem present in
these theories is discussed.


title: Star Wreck

abstract:
  Electroweak models with low-energy supersymmetry breaking predict the
existence of stable non-topological solitons, Q-balls, that can be produced in
the early universe. The relic Q-balls can accumulate inside a neutron star and
gradually absorb the baryons into the scalar condensate. This causes a slow
reduction in the mass of the star. When the mass reaches a critical value, the
neutron star becomes unstable and explodes. The cataclysmic destruction of the
distant neutron stars may be the origin of the gamma-ray bursts.


title:
Electroweak Phase Transition and Baryogenesis in the Minimal
  Supersymmetric Standard Model

abstract:
  I describe work done in collaboration with M. Joyce and K. Kainulainen on (1)
the strength of the electroweak phase transition in the MSSM and (2) the
mechanism for producing the baryon asymmetry during the phase transition. In
the former we compare the effective potential and dimensional reduction methods
for describing the phase transition and search the parameter space of the MSSM
for those values where it is strong enough. In the latter we give a systematic
computation of the baryon asymmetry due the CP-violating force acting on
charginos in the vicinity of the bubble wall. We find that a light right-handed
stop, a light Higgs boson, and a large phase in the mu parameter, are the main
necessary ingredients for producing the baryon asymmetry.


title: Mass of the Lowest Scalar (0++) Glueball in the QCD Sum Rules

abstract:
  The mass of the lowest scalar glueball is discussed by using QCD sum rules.
We find that the glueball mass is sensitive to the choice of moments and
slightly depends on the radiative corrections. With the help of suitable
moments and stability criteria, we get the scalar glueball mass: $1710\pm110$
MeV without radiative corrections and $1580\pm150$ MeV with radiative
corrections.


title: Perturbative framework for the pi(+)pi(-) atom

abstract:
  The perturbative framework is developed for the calculation of the pi(+)pi(-)
atom characteristics on the basis of the field-theoretical Bethe-Salpeter
approach. A closed expression for the first-order correction to the pi(+)pi(-)
atom lifetime has been obtained.


title: On The Deser-Siegel-Townsend Notivarg

abstract:
  The interaction of the notivarg with an external Weyl current is discussed.
The continuity equation for the Weyl current is obtained. The canonical
analysis of the theory of the notivarg interacting with the external Weyl
current is performed. The covariant propagator of the notivarg is found.


title:
Comment on ``Interference Fragmentation Functions and Valence Quark Spin
  Distributions in the Nucleon''

abstract:
  The original version of this paper commented on a paper by Jaffe, Jin, and
Tang (hep-ph/9710561). That paper has been revised, and my original comment no
longer applies to the revised version. The original version of my comment
(hep-ph/9801217v1) provides a simple argument that two-particle correlations in
parity-invariant fragmentation cannot provide a measurement of the helicity of
the fragmenting quark.


title: Coherent muon-electron conversion in muonic atoms

abstract:
  Transition rates for coherent muon-electron conversion in muonic atoms, mu+N
--> e+N, are computed for various types of muon number violating interactions.
Attention is paid to relativistic atomic effects, Coulomb distortion, finite
nuclear size, and nucleon distributions. Discrepancies with previously
published results are pointed out and explained. Results are presented for
several elements of current and future experimental interest.


title:
Multiplicity Distribution and Mechanisms of the High-Energy Hadron
  Collisions

abstract:
  We discuss the multiplicity distribution for highest accessible energies of
$pp$- and $\bar pp$- interactions from the point of view of the multiparton
collisions. The inelastic cross sections for the single, $\sigma_1$, and
multiple (double and, presumably, triple, $\sigma_{2+3}$) parton collisions are
extracted from the analysis of the experimental data on the multiplicity
distribution up to the Tevatron energies. It follows that $\sigma_1$ becomes
energy independent while $\sigma_{2+3}$ increases with $\sqrt{s}$ for
$\sqrt{s}\ge$ 200 GeV. The observed growth of $<p_{\perp}>$ with multiplicity
is attributed to the increasing role of multiparton collisions for the high
energy $\bar pp(pp)$- inelastic interactions.


title:
Simplifying Algebra in Feynman Graphs, Part II: Spinor Helicity from the
  Spacecone

abstract:
  Manifestly Lorentz covariant Feynman rules are given in terms of a "scalar"
field for each helicity, dramatically simplifying the calculation of amplitudes
with massless particles. The spinor helicity formalism is properly identified
as a null complex spacelike (not lightlike) gauge, where two massless external
momenta define the reference frame. Usually this gauge is applied only to
external line factors; we extend this method to vertices and propagators by
modifying the action itself using lightcone methods.


title: Equal-Time Hierarchies in Quantum Transport Theory

abstract:
  We investigate in the equal-time formalism the derivation and truncation of
infinite hierarchies of equations of motion for the energy moments of the
covariant Wigner function. From these hierarchies we then extract kinetic
equations for the physical distribution functions which are related to
low-order energy moments, and show how to determine the higher order moments in
terms of these lowest order ones. We apply the general formalism to scalar and
spinor QED with classical background fields and compare with the results
derived from the three-dimensional Wigner transformation method.


title: Light-Cone Sum Rules

abstract:
  A short introduction is given to the method of light-cone sum rules, their
theoretical background and main modifications. The discussion is concentrated
but not restricted to the applications to heavy quark decays.


title:
Vortex formation in two dimensions: When symmetry breaks, how big are
  the pieces?

abstract:
  We investigate the dynamics of second order phase transitions in two
dimensions, breaking a gauged U(1) symmetry. Using numerical simulations, we
show that the density of topological defects formed scales with the quench
timescale $\tau_Q$ as $n \sim \tau_Q^{-1/2}$ when the dynamics is overdamped at
the instant when the freezeout of thermal fluctuations takes place, and $n \sim
\tau_Q^{-2/3}$ in the underdamped case. This is predicted by the scenario
proposed by one of us [1].


title: Two-loop operator matrix elements calculated up to finite terms

abstract:
  We present the two-loop corrected operator matrix elements calculated in
N-dimensional regularization up to the finite terms which survive in the limit
$\epsilon = N - 4 \to 0 $. The anomalous dimensions of the local operators have
been previously extracted from the pole terms and determine the scale evolution
of the deep inelastic structure functions measured in unpolarized lepton hadron
scattering. The finite $\epsilon$-independent terms in the two-loop expressions
are needed to renormalize the local operators up to third order in the strong
coupling constant $\alpha_s$. Further the unrenormalized expressions for the
two-loop corrected operator matrix elements can be inserted into specific one
loop graphs to obtain a part of the third order contributions to these matrix
elements. This work is a first step in obtaining the anomalous dimensions up to
third order so that a complete next-to-next-to-leading order (NNLO) analysis
can be carried out for deep inelastic electroproduction.


title:
Gluon interference effects in t-tbar production at the Next Linear
  Collider

abstract:
  We study the effects of gluon interference in the production and
semi-leptonic decay of a t-tbar pair above threshold at the Next Linear
Collider (NLC). We calculate all matrix elements to next-to-leading order and
use the resulting expressions for the development of a Monte Carlo event
generator. Our results show effects at the level of 10% in differential
cross-sections. We thus extend previous results obtained by analytical means in
the soft-gluon limit.


title: An Explanation for the rho-pi Puzzle of J/psi and psi' Decays

abstract:
  We propose a new explanation for the longstanding puzzle of the tiny
branching fraction of psi' -> rho pi relative to that for J/psi -> rho pi. In
the case of J/psi, we argue that this decay is dominated by a higher Fock state
in which the ccbar pair is in a color-octet ^3S_1 state and via annihilate
process ccbar -> qqbar. In the case of the psi', we argue that the probability
for the ccbar pair in this higher Fock state to be close enough to annihilate
is suppressed by a dynamical effect related to the small energy gap between the
mass of the psi' and the DDbar threshold.


title:
A Comparative Study for the Evolution of Structure Functions: DGLAP
  versus FOPT

abstract:
  We investigate an alternative to the DGLAP evolution of structure functions
through the use of Fixed Order Perturbation Theory. Remarkable agreement
between the two methods are found in the polarized sector for a wide $x$, $Q^2$
region. However, for the unpolarized sector the agreement is poorer.


title:
Quark Model, Nonperturbative Wave Functions, the QCD Sum Rules and
  Instantons

abstract:
  The main subject of these lectures is the Nonperturbative Wave Functions. We
describe some nonperturbative methods (like QCD sum rules, dispersion
relations, duality etc) in order to study this object. We also consider some
applications of the obtained results, such as form factors, inclusive
amplitudes and diffractive electroproduction. Finally, we discuss the instanton
liquid model which may help us to understand the success of the constituent
quark model.


title:
Stringent New Bounds on Supersymmetric Higgs Bosons from Existing
  Tevatron Data

abstract:
  Limits are derived on models with extended Higgs sectors, including the
Minimal Supersymmetric Standard Model (MSSM), by exploiting the data on $\tau^+
\tau^- + $ 2 jets final states, used by the CDF collaboration to place limits
on third generation leptoquarks. The main observation here is that both
leptoquark production and associated $b \bar{b}$ Higgs production can lead to
$b \bar{b} \tau^+ \tau^-$ final states.


title:
Analysis of hadronic invariant mass spectrum in inclusive charmless
  semileptonic B decays

abstract:
  We make an analysis of the hadronic invariant mass spectrum in inclusive
charmless semileptonic B meson decays in a QCD-based approach. The decay width
is studied as a function of the invariant mass cut. We examine their
sensitivities to the parameters of the theory. The theoretical uncertainties in
the determination of $|V_{ub}|$ from the hadronic invariant mass spectrum are
investigated. A strategy for improving the theoretical accuracy in the value of
$|V_{ub}|$ is described.


title:
Recent Developments in Perturbative QCD: Q^2 Evolution of Chiral-Odd
  Distributions h_1(x,Q^2) and h_L(x,Q^2)

abstract:
  After reviewing QCD definitions of the chiral-odd spin-dependent parton
distributions $h_1(x,Q^2)$ and h_L(x,Q^2), I will summarize the main feature of
the recent two results in perturbative QCD: (i) Next-to-leading order $Q^2$
evolution of h_1(x,Q^2). (ii) Leading order Q^2 evolution of the twist-3
distribution h_L(x,Q^2) and the universal simplification of the Q^2 evolution
of all the twist-3 distributions in the large N_c limit.


title: Phase Transitions in the Core of Global Embedded Defects

abstract:
  We demonstrate the existence of global monopole and vortex configurations
whose core exhibits a phase structure. We determine the critical values of
parameters for which the transition from the symmetric to the non-symmetric
phase occurs and discuss the novel dynamics implied by the non-symmetric cores
for defect interactions. We model phase transitions in the core of global
embedded topological defects by identifying the relevant parameters with the
vacuum expectation value of a dynamical scalar field. Finally, we argue that
superheavy defects that undergo a core phase transition in the very early
universe provide a novel realization for topological inflation.