title: Electroweak symmetry breaking as a consequence of compact dimensions

abstract:
  It has been shown recently that the Higgs doublet may be composite, with the
left-handed top-bottom doublet and a new right-handed anti-quark as
constituents bound by some four-quark operators with nonperturbative
coefficients. I show that these operators are naturally induced if there are
extra space dimensions with a compactification scale in the multi-TeV range.
The Higgs compositness is due mainly to the Kaluza-Klein modes of the gluons,
while flavor symmetry breaking may be provided by various fields propagating in
the compact dimensions. I comment briefly on the embedding of this scenario in
string theory.


title: Dynamics in the Conformal Window in QCD like Theories

abstract:
  The dynamics with an infrared stable fixed point in the conformal window in
QCD like theories (with a relatively large number of fermion flavors) is
studied. The dependence of masses of colorless bound states on a bare fermion
mass is described. In particular it is shown that in such dynamics, glueballs
are much lighter than bound states composed of fermions, if the value of the
infrared fixed point is not too large. This yields a clear signature for the
conformal window, which is in particular can be useful for lattice computer
simulations of these gauge theories.


title:
Neutrino mixing and masses from long baseline and atmospheric
  oscillation experiments

abstract:
  We argue that regardless of the outcome of future Long Baseline experiments,
additional information will be needed to unambiguously decide among the
different scenarios of neutrino mixing. We use, for this purpose, a simple test
of underground data: an asymmetry between downward and upward going events.
Such an asymmetry, in which matter effects can be crucial, tests electron and
muon neutrino data separately and can be compared with the theoretical
prediction without relying on any simulation program.


title: Survival Probability of Large Rapidity Gaps

abstract:
  We summarize the discussions on the value of the survival probabilities of
large rapidity gap (LRG) processes at Durham WS'98.


title: On Bell's locality tests with neutral kaons

abstract:
  We present some general considerations on possible experimental tests of
Bell's locality in the neutral kaon system, and comment on the recent
literature on the topic.


title: U_A(1) Problems and Gluon Topology - Anomalous Symmetry in QCD

abstract:
  Many of the distinctive and subtle features of the dynamics in the $U_A(1)$
channel in QCD can be related to gluon topology, more precisely to the
topological susceptibility $\chi(k^2) = i\int d^4x~e^{ikx}< 0|T~Q(x)~Q(0)|0>$,
where $Q = {\a_s\over8\pi} {\rm tr} G_{\m\n} \tilde G^{\m\n}$ is the gluon
topological charge density. The link is the $U_A(1)$ axial (ABJ) anomaly. In
this lecture, we describe the anomalous $U_A(1)$ chiral Ward identities in a
functional formalism and show how two apparently unrelated `$U_A(1)$ problems'
-- the mass of the $\eta'$ and the violation of the Ellis-Jaffe sum rule in
polarised deep-inelastic scattering -- can be explained in terms of the gluon
topological susceptibility. They are related through a $U_A(1)$ extension of
the Goldberger-Treiman formula, which is derived here for QCD with both
massless and massive quarks.


title: The Proton-Spin Crisis: another ABJ anomaly?

abstract:
  Contents: 1. Introduction; 2. The First Moment Sum Rule for $g_1^p$; 3. The
Parton Model and the `Proton Spin'; 4. The CPV Method and Topological Charge
Screening; 5. Experiment; 6. Semi-Inclusive Polarised DIS.


title: Neutrino masses and Z' physics

abstract:
  The characteristic scale of neutral current, provided by an extension of
Standard Model with a local group over the right-handed fermions, determines
the smallness of neutrino masses of Dirac kind. The experimental observation of
neutrino oscillations imposes the stringent limit on the $Z^\prime$ physics
appearance at low energies.


title: Automatic Computation of Feynman Diagrams

abstract:
  Quantum corrections significantly influence the quantities observed in modern
particle physics. The corresponding theoretical computations are usually quite
lengthy which makes their automation mandatory. This review reports on the
current status of automatic calculation of Feynman diagrams in particle
physics. The most important theoretical techniques are introduced and their
usefulness is demonstrated with the help of simple examples. A survey over
frequently used programs and packages is provided, discussing their abilities
and fields of applications. Subsequently, some powerful packages which have
already been applied to important physical problems are described in more
detail. The review closes with the discussion of a few typical applications for
the automated computation of Feynman diagrams, addressing current physical
questions like properties of the $Z$ and Higgs boson, four-loop corrections to
renormalization group functions and two-loop electroweak corrections.


title:
Heavy-to-Light Form Factors in the Final Hadron Large Energy Limit of
  QCD

abstract:
  We argue that the Large Energy Effective Theory (LEET), originally proposed
by Dugan and Grinstein, is applicable to exclusive semileptonic, radiative and
rare heavy-to-light transitions in the region where the energy release E is
large compared to the strong interaction scale and to the mass of the final
hadron, i.e. for q^2 not close to the zero-recoil point. We derive the
Effective Lagrangian from the QCD one, and show that in the limit of heavy mass
M for the initial hadron and large energy E for the final one, the heavy and
light quark fields behave as two-component spinors. Neglecting QCD
short-distance corrections, this implies that there are only three form factors
describing all the pseudoscalar to pseudoscalar or vector weak current matrix
elements. We argue that the dependence of these form factors with respect to M
and E should be factorizable, the M-dependence (sqrt(M)) being derived from the
usual heavy quark expansion while the E-dependence is controlled by the
behaviour of the light-cone distribution amplitude near the end-point u=1. The
usual expectation of the (1-u) behaviour leads to a 1/E^2 scaling law, that is
a dipole form in q^2. We also show explicitly that in the appropriate limit,
the Light-Cone Sum Rule method satisfies our general relations as well as the
scaling laws in M and E of the form factors, and obtain very compact and simple
expressions for the latter. Finally we note that this formalism gives
theoretical support to the quark model-inspired methods existing in the
literature.


title: QCD-Instantons at HERA -- An Introduction

abstract:
  We review our ongoing theoretical and phenomenological study of the discovery
potential for instanton-induced events in deep-inelastic scattering (DIS) at
HERA. Constraints from recent lattice simulations will be exploited and
translated into a ``fiducial'' kinematical region for our predictions of the
instanton-induced DIS cross-section.


title: Phenomenology of Neutrino Oscillations

abstract:
  This review is focused on neutrino mixing and neutrino oscillations in the
light of the recent experimental developments. After discussing possible types
of neutrino mixing for Dirac and Majorana neutrinos and considering in detail
the phenomenology of neutrino oscillations in vacuum and matter, we review all
existing evidence and indications in favour of neutrino oscillations that have
been obtained in the atmospheric, solar and LSND experiments. We present the
results of the analyses of the neutrino oscillation data in the framework of
mixing of three and four massive neutrinos and investigate possibilities to
test the different neutrino mass and mixing schemes obtained in this way. We
also discuss briefly future neutrino oscillation experiments.


title: Constraints on mixing angles of Majorana neutrinos

abstract:
  By combining the inputs from the neutrinoless double beta decay and the fits
of cosmological models of dark matter with solar and atmospheric neutrino data,
we obtain constraints on two of the mixing angles of Majorana neutrinos, which
become stronger when coupled with the reactor neutrino data. These constraints
are strong enough to rule out Majorana neutrinos if the small angle solution of
solar neutrino puzzle is borne out.


title: Strong WW interactions at the LHC

abstract:
  We present a brief pedagogical introduction to the Effective Electroweak
Chiral Lagrangians, which provide a model independent description of the WW
interactions in the strong regime. When it is complemented with some
unitarization or a dispersive approach, this formalism allows the study of the
general strong scenario expected at the LHC, including resonances.


title: Unification of the $k_T$ and threshold resummations

abstract:
  We derive a resummation formula for a $k_T$-dependent parton distribution
function at threshold, where $k_T$ is a parton transverse momentum. The
derivation requires infrared cutoffs for both longitudinal and transverse loop
momenta as evaluating soft gluon emissions in the Collins-Soper resummation
framework. This unified resummation exhibits suppression at large $b$, $b$
being the conjugate variable of $k_T$, which is similar to the $k_T$
resummation, and exhibits enhancement at small $b$, similar to the threshold
resummation.


title:
Percolation approach to phase transitions in high energy nuclear
  collisions

abstract:
  We study continuum percolation in nuclear collisions for the realistic case
in which the nuclear matter distribution is not uniform over the collision
volume, and show that the percolation threshold is increased compared to the
standard, uniform situation. In terms of quark-gluon plasma formation this
means that the phase transition threshold is pushed to higher energies.


title: Our World as an Expanding Shell

abstract:
  In the model where the Universe is considered as a thin shell expanding in
5-dimensional hyper-space there is a possibility to have just one scale for a
particle theory corresponding to the Universe thickness. From a realistic model
the relation of this parameter to the Universe size was found.


title: The BFKL Equation at Next-to-Leading Order and Beyond

abstract:
  On the basis of a renormalization group analysis of the kernel and of the
solutions of the BFKL equation with subleading corrections, we propose and
calculate a novel expansion of a properly defined effective eigenvalue
function. We argue that in this formulation the collinear properties of the
kernel are taken into account to all orders, and that the ensuing
next-to-leading truncation provides a much more stable estimate of hard Pomeron
and of resummed anomalous dimensions.


title: Higgs boson. Complete discovery and the windiw to a New Physics

abstract:
  1. We discuss the opportunities of complete Higgs boson discovery at
different colliders. Main conclusion here is: Photon collider is the best for
this goal. 2. We discuss how to use the Higgs boson (after its discovery) as
the window to a New Physics. Main conclusion here is: Higgs boson production in
gluon and photon fusion together with production in process $e\gamma\to eH$
provides very good window to a New Physics with the scale $\Lambda\gg M_H$.


title: Semirelativistic Treatment of Bound States

abstract:
  This talk reviews several aspects of the "semirelativistic" description of
bound states by the spinless Salpeter equation (which represents the simplest
equation of motion incorporating relativistic effects) and, in particular,
presents or recalls some very simple and elementary methods which allow to
derive rigorous statements on the corresponding solutions, that is, on energy
levels as well as wave functions. In principle, these methods work for all
physical situations which may be formulated as an eigenvalue problem.


title:
Effect of supersymmetric CP phases on the $B \to X_s \gamma$ and $B \to
  X_s l^+ l^-$ decays in the minimal supergravity model

abstract:
  We investigate the effect of supersymmetric CP violating phases on the $B\to
X_s \gamma$ and $B\to X_s l^+l^-$ decays in the minimal supergravity model. We
show that the phase of the trilinear scalar coupling constant for top squarks
is strongly suppressed and aligned to that of the gaugino mass due to a
renormalization effect from the Planck scale to the electroweak scale. As a
result, the effect of supersymmetric CP violating phases on the $B \to X_s
\gamma$ and $B \to X_s l^+ l^-$ decays are small taking into account the
neutron and the electron electric dipole moment constraints. For the $B \to
X_s\gamma$ decay, the amplitude has almost no new CP violating phase and the
direct CP asymmetry is less than 2 %. For the $B \to X_s l^+ l^-$ decay, the
branching ratio can be sizably different from that in the standard model only
when the sign of the $B \to X_s \gamma$ amplitude is opposite to that in the
standard model.


title: Evaluation of $\alpha(M_{\rm Z}^2)$ and $(g-2)_\mu$

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


title:
Comment on "Calculation of Quarkonium Spectrum and m_b, m_c to Order
  alpha^4"

abstract:
  In a recent paper, we included two loop, relativistic one loop and second
order relativistic tree level corrections, plus leading nonperturbative
contributions, to obtain a calculation of the lower states in the heavy
quarkonium spectrum correct up to, and including, $O(\alpha_s^4)$ and leading
$\Lambdav^4/m^4$ terms. The results were obtained with, in particular, the
value of the two loop static coefficient due to Peter; this been recently
challenged by Schr\"oder. In our previous paper we used Peter's result; in the
present one we now give results with Schr\"oder's, as this is likely to be the
correct one. The variation is slight as the value of $b_1$ is only one among
the various $O(\alpha_s^4)$ contributions. With Schr\"oder's expression we now
have, $$m_b=5\,001^{+104}_{-66}\;\mev;\quad
\bar{m}_b(\bar{m}_b^2)=4\,440^{+43}_{-28}\;\mev,$$
$$m_c=1\,866^{+190}_{-154}\;\mev;\quad
\bar{m}_c(\bar{m}_c^2)=1\,531^{+132}_{-127}\;\mev.$$ Moreover,
$$\Gammav(\Upsilonv\rightarrow e^+e^-)=1.07\pm0.28\;\kev
\;(\hbox{exp.}=1.320\pm0.04\,\kev)$$ and the hyperfine splitting is predicted
to be $$M(\Upsilonv)-M(\eta)=47^{+15}_{-13}\;\mev.$$


title: B Physics in the Next Millennium

abstract:
  As we approach the turn of the century, the Standard Model is still
consistent with all our experimental observations and the path to a more
complete picture of the fundamental constituents and their interactions has yet
to be clearly identified. Beauty flavored hadrons have provided crucial
experimental information on several fundamental parameters of the Standard
Model and may lead to one of the most challenging test of its validity and
provide some clues on the path towards a more complete theory. Several
experiments will try to explore this rich phenomenology in the next few years.
Their physics goals and discovery potential will be compared.


title: Tau weak dipole moments from azimuthal asymmetries

abstract:
  We show that transverse and normal single-$tau$ polarization of $tau$ pairs
produced at $e^+$ $e^-$ unpolarized collisions, at the $Z$ peak, are sensitive
to weak (magnetic and electric) dipole moments of the $tau$. We also show how
these components of the $\tau$ polarization are accessible by measuring
appropriate azimuthal asymmetries in the angular distribution of its decay
products. Sensitivities of the order of $10^{-18}$ $e\cdot cm$, for the
weak-electric dipole moment, and $10^{-4}$ ($10^{-3}$), for the real
(imaginary) part of the weak-magnetic dipole moment of $\tau$, may be achieved.
Compatible bounds are also presented from spin-spin correlated asymmetries.


title: Uncovereing thick and thin strings via renormalons

abstract:
  The talk is about the power corrections in QCD. Renormalons, both infrared
and ultraviolet, provide with a kind of a kinematical framework to fix
exponents of the leading power corrections to various observables. Any viable
dynamical framework is to reproduce this pattern of the power corrections. In
this mini-review, we emphasize that a simple dynamical framework satisfying
this requirement may well be provided by the strings inherent to the Abelian
Higgs model. This model comes naturally into consideration within the U(1)
projection of QCD which makes explicit the dual-superconductor model of the
confinement. At large distances (compared to $\LQ^{-1}$) there are
Abrikosov-Nielsen-Olesen strings which develop a characteristic
non-perturbative transverse size of order $\LQ^{-1}$ and match in this way the
infrared renormalons. At short distances there are no ANO strings but there
still exist dynamical manifestations of the stringy topological condition that
(external) quarks are connected by a mathematically thin line along which the
vacuum is trivial. These manifestations may match ultraviolet renormalons.


title:
Theoretical Update of Pseudoscalar Meson Distribution Amplitudes of
  Higher Twist: The Nonsinglet Case

abstract:
  We discuss the two and three particle light-cone distribution amplitudes
(DAs) of pseudoscalar nonsinglet mesons of twist 3 and 4. Using nonlocal
operator identities and conformal expansion, we derive closed expressions for
several DAs. We also include meson-mass corrections which prove to be dominant
in the twist 4 DAs of K and eta mesons. Explicit parametrizations for the DAs
of pi, K and eta mesons are given, with the numerical input parameters
determined from QCD sum rules.


title: Chiral Random Matrix Models in QCD

abstract:
  We review some motivation behind the introduction of chiral random matrix
models in QCD, with particular emphasis on the importance of the
Gell-Mann-Oakes (GOR) relation for these arguments. We show why the microscopic
limit is universal in power counting, and present arguments for why the
macroscopic limit is generic for a class of problems that defy power counting,
examples being the strong CP and U(1) problems. Some new results are discussed
in light of recent lattice simulations.


title:
Constraints on Topcolor Assisted Technicolor Models from Vertex
  Corrections

abstract:
  We use the LEP/SLD data to place constraints on Topcolor Assisted Technicolor
Models. We find that due to a large negative shift in R_b induced by charged
top-pion exchange, it is difficult to make the models compatible with
experiment.


title: Light by Light Scattering at High Energy: a Tool to Reveal New Particles

abstract:
  We point out a few remarkable properties of the $\gamma\gamma\to\gamma\gamma$
process at high energy. They should allow to search for effects of new
particles and interactions. We give illustrations with threshold effects due to
pairs of new charged particles (charginos, charged Higgses, sfermions),
resonance effects due to s-channel production of neutral scalars (standard or
supersymmetric Higgs particles, technipions) and unitarity saturating
amplitudes due to a strongly interacting sector. The use of polarized photon
beams is also briefly discussed.


title: Does Weak CP Phase Originate from a Certain Geometry ?

abstract:
  We further investigate the probability that, weak CP phase originates in a
certain geometry. We find that our postulation on weak CP Phase gives strict
constraints on angle gamma in unitarity triangle DB and the element Vtd in
Cabibbo-Kobayashi-Maskawa (CKM) matrix. The predicted Vtd is about 0.0086 and
gamma about 75.3^o with the very narrow window respectively. These two
parameters can be used to test our postulation precisely in near future.


title:
Polarized Virtual Photon Structure Function in the Next-to-leading Order
  in QCD

abstract:
  The virtual photon structure function $g_1^{\gamma}(x,Q^2,P^2)$, which can be
obtained in polarized $e^{+}e^{-}$ colliding-beam experiments, is investigated
for $\Lambda^2 \ll P^2 \ll Q^2$, where $-Q^2$ ($-P^2$) is the mass squared of
the probe (target) photon. The analysis is made to next-to-leading order in
QCD, in the framework of the QCD improved parton model with the DGLAP evolution
equations. The non-leading corrections significantly modify the leading log
result, in particular, at large $x$ as well as at small $x$.


title:
Four Light Neutrinos in Singular Seesaw Mechanism with Abelian Flavor
  Symmetry

abstract:
  The four light neutrino scenario, which explains the atmosphere, solar and
LSND neutrino experiments, is studied in the framework of the seesaw mechanism.
By taking both the Dirac and Majorana mass matrix of neutrinos to be singular,
the four neutrino mass spectrum consisting of two almost degenerate pairs
separated by a mass gap $\sim 1$ eV is naturally generated. Moreover the
right-handed neutrino Majorana mass can be at $\sim 10^{14}$ GeV scale unlike
in the usual singular seesaw mechanism. Abelian flavor symmetry is used to
produce the required neutrino mass pattern. A specific example of the flavor
charge assignment is provided to show that maximal mixings between the
$\nu_\mu-\nu_\tau$ and $\nu_e-\nu_s$ are respectively attributed to the
atmosphere and solar neutrino anomalies while small mixing between two pairs to
the LSND results. The implication in the other fermion masses is also
discussed.


title: Recent developments in Deep-Inelastic Scattering

abstract:
  We review several recent developments in the theory and phenomenology of
deep-inelastic scattering, with particular emphasis on precision tests of QCD
and progress in the detailed perturbative treatment of structure functions and
parton distributions. We discuss specifically determinations of alpha_s; higher
twist contributions to structure functions and renormalons; structure functions
at small x and resummation of energy logarithms.


title: Spin Physics

abstract:
  We review the current situation in polarized scattering experiments. We
describe the theoretical interpretation of inclusive deep inelastic processes,
the current experimental situation and perturbative analyses which extract
structure functions and parton distribution functions. We also discuss various
issues such as positivity constraints, small x and the possibility of polarized
colliding beam experiments at HERA, semi-inclusive processes, the separation of
flavors and the measurement of the gluon polarization, and the possibility of
using polarisation experiments to put constraints on new physics.


title: Precise tests of a quark mass texture

abstract:
  The relations $|V_{ub}/V_{cb}|=(m_u/m_c)^{1/2}$ and
$|V_{td}/V_{ts}|=(m_d/m_s)^{1/2}$ between the CKM matrix elements and the quark
masses are shown to imply a remarkably precise determination of the CKM
unitarity triangle or of the Wolfenstein parameters $\rho$, $\eta$ consistent
with the data so far. We view this as a clean test of a quark mass texture
neatly arising from a hierarchical breaking of a U(2) flavour symmetry.


title: Probing the Structure of the Pomeron

abstract:
  We suggest that the pseudo-rapidity cut dependence of diffractive
deep-inelastic scattering events at HERA may provide a sensitive test of models
of diffraction. A comparison with the experimental cross section shows that the
Donnachie-Landshoff model and a simple two-gluon exchange model of the pomeron
model are disfavoured. However a model with a direct coupling of the pomeron to
quarks is viable for a harder quark--pomeron form factor, as is a model based
on the leading-twist operator contribution. We also consider a direct-coupling
scalar pomeron model. We comment on the implications of these results for the
determination of the partonic structure of the pomeron.


title: Effective action for QED in 2+1 dimensions at finite temperature

abstract:
  We calculate the effective action for a constant magnetic field and a
time-dependent time-component of the gauge field in 2+1 dimensions at finite
temperature. We also discuss the behaviour of the charge density and the
fermion condensate as order parameters of symmetry breaking.


title:
Effects of Higgs sector CP violation in top-quark pair production at the
  LHC

abstract:
  A striking manifestation of CP violation in the electroweak symmetry breaking
sector would be the existence of neutral Higgs boson(s) with undefined CP
parity. We analyse signatures of such a boson, with a mass of about 300 GeV or
larger, produced in high energy proton-proton collisions at LHC energies in its
top-quark antitop-quark decay channel. The large irreducible $t\bar t$
background is taken into account. We propose, both for the dilepton and the
lepton + jets decay channels of $t\bar t$, several correlations and asymmetries
with which (Higgs sector) CP violation can be traced. We show that for
judiciously chosen cuts on the $t\bar t$ invariant mass these CP observables
yield, for an LHC integrated luminosity of 100 $\rm{fb}^{-1}$, statistically
significant signals for a range of Higgs boson masses and Yukawa couplings.


title:
Strange form factors of the proton: a new analysis of the neutrino
  (antineutrino) data of the BNL-734 experiment

abstract:
  We consider ratios of elastic neutrino(antineutrino)-proton cross sections
measured by the Brookhaven BNL-734 experiment and use them to obtain the
neutral current (NC) over charged current (CC) neutrino-antineutrino asymmetry.
We discuss the sensitivity of these ratios and of the asymmetry to the
electric, magnetic and axial strange form factors of the nucleon and to the
axial cutoff mass M_A. We show that the effects of the nuclear structure and
interactions on the asymmetry and, in general, on ratios of cross sections are
negligible. We find some restrictions on the possible values of the parameters
characterizing the strange form factors. We show that a precise measurement of
the neutrino-antineutrino asymmetry would allow the extraction of the axial and
vector magnetic strange form factors in a model independent way. The
neutrino-antineutrino asymmetry turns out to be almost independent on the
electric strange form factor and on the axial cutoff mass.


title: Are Right-Handed Mixings Observable?

abstract:
  Asymmetric mass matrices can induce large RH mixings. Those are non-
measurable in the SM but are there and play an important role in its
extensions. The RH rotations are in particular relevant for the proton decay,
neutrino properties and baryon asymmetry. E.g. large RH mixings lead to kaon
dominated proton decay even without SUSY and could be the reason for a large
neutrino mixing. By studying those phenomena one can learn about the RH
rotation matrices and this can reduce considerably the arbitrariness in the
present fermionic mass study.


title:
Effects of magnetohydrodynamics matter density fluctuations on the solar
  neutrino resonant spin-flavor precession

abstract:
  Taking into account the stringent limits from helioseismology observations on
possible matter density fluctuations described by magnetohydrodynamics theory,
we find the corresponding time variations of solar neutrino survival
probability due to the resonant spin-flavor precession phenomenon with
amplitude of order O(10%). We discuss the physics potential of high statistics
real time experiments, like as Superkamiokande, to observe the effects of such
magnetohydrodynamics fluctuations on their data. We conclude that these
observations could be thought as a test of the resonant spin-flavor precession
solution to the solar neutrino anomaly.


title: Field-induced axion emission via process $e^+ e^- \to a$ in plasma

abstract:
  The annihilation into axion $e^+ e^- \to a$ is investigated in a plasma and
an external magnetic field. This process via a plasmon intermediate state has a
resonant character at a particular energy of the emitted axion. The emissivity
by $e^+ e^- \to a$ is compared with the axion cyclotron emissivity.


title: Non-Leptonic Two-Body B Decays Beyond Factorization

abstract:
  We present a general scheme and scale independent parameterization of
two-body non-leptonic B decay amplitudes which includes perturbative QCD
corrections as well as final state interactions in a consistent way. This
parameterization is based on the Next-to-Leading effective Hamiltonian for
non-leptonic B decays and on Wick contractions in the matrix elements of the
local operators. Using this parameterization, and making no dynamical
assumption, we present a classification of two-body B decay channels in terms
of the parameters entering in the decay amplitudes. This classification can be
considered as the starting point for a model-independent analysis of
non-leptonic B decays and of CP violating asymmetries. We also propose, on the
basis of the large N expansion, a possible hierarchy among the different
effective parameters. We discuss the strategy to extract the most important
effective parameters from the experimental data. Finally, we establish a
connection between our parameterization and the diagrammatic approach which is
widely used in the literature.


title: The intrinsic charm contribution to the proton spin

abstract:
  The charm quark contribution to the first moment of $g_1(x,Q^2)$ is
calculated using a heavy mass expansion of the divergence of the singlet axial
current. It is shown to be small.


title:
The muon anomalous magnetic moment in QED: three-loop electron and tau
  contributions

abstract:
  We present an analytic calculation of electron and tau O(alpha^3) loop
effects on the muon anomalous magnetic moment. Computation of such three-loop
diagrams with three mass scales is possible using asymptotic and eikonal
expansions. An evaluation of a new type of eikonal integrals is presented in
some detail.


title: Generalized Schwinger Mass Formula

abstract:
  We generalize Schwinger's original mass formula to the case of an additional
isosinglet mixing with the nonet mesons. We then make further generalization to
either (i) an arbitrary number of additional isosinglets mixing with nonet
mesons, or (ii) an arbitrary number of mesons mixing with an additional
isosinglet. In the former case, we present an explicit relation, while in the
latter case, we show by numerical example that the new mass formula is only
weakly affected by the inclusion of additional mesons, and hence holds with
good accuracy for each of the 3x3 mass sub-matrices.


title:
Model-Independent Analysis of B -> pi K Decays and Bounds on the Weak
  Phase gamma

abstract:
  A general parametrization of the amplitudes for the rare two-body decays B ->
pi K is introduced, which makes maximal use of theoretical constraints arising
from flavour symmetries of the strong interactions and the structure of the
low-energy effective weak Hamiltonian. With the help of this parametrization, a
model-independent analysis of the branching ratios and direct CP asymmetries in
the various B -> pi K decay modes is performed, and the impact of hadronic
uncertainties on bounds on the weak phase gamma = arg(Vub*) is investigated.


title: Aspects of Type I String Phenomenology

abstract:
  We study different phenomenological aspects of compact, D=4, N=1 Type IIB
orientifolds considered as models for unification of the standard model and
gravity. We discuss the structure of the compactification, string and
unification scales depending on the different possible D-brane configurations.
It is emphasized that in the context of Type I models the $M_W/M_{Planck}$
hierarchy problem is substantially alleviated and may be generated by
geometrical factors. We obtain the effective low-energy supergravity Lagrangian
and derive the form of soft SUSY-breaking terms under the assumption of
dilaton/moduli dominance. We also discuss the role of anomalous U(1)'s and of
twisted moduli in this class of theories. A novel mechanism based on the role
of singularities is suggested to achieve consistency with gauge coupling
unification in low string scale models.


title: Nuclear Shadowing in DIS at Moderately Small $x_B$

abstract:
  In the rest frame of the nucleus, shadowing is due to hadronic fluctuations
of the incoming virtual photon, which interact with the nucleons. We expand
these fluctuations in a basis of eigenstates of interaction and take only the
$q\bar q$ component of the hadronic structure of the photon into account. We
use a representation in which the $q\bar q$-pair has a definite transverse
size. Starting from the Dirac equation, we develop a path integral approach
that allows to sum all multiple scattering terms and accounts for fluctuations
of the transverse size of the pair, as well as for the finite lifetime of the
hadronic state. First numerical results hep-ph/9807211 have shown that higher
order scattering terms have a strong influence on the total cross section
$\sigma^{\gamma^*A}_{tot}$. The aim of this paper is to give a detailed
derivation of the formula for the total cross section.


title: The Tau Lepton: Particle Physics in a Nutshell

abstract:
  Recent theoretical results in tau lepton physics and their implications for
the experimental analysis are presented. The paper is split into the following
chapters: 1. Introduction, 2. Weak Couplings, 3. Inclusive Decays, Perturbative
QCD and Sum Rules, 4. Exclusive Decays, 5. Beyond the Standard Model.


title: The Tau Lepton and the Search for New Elementary Particle Physics

abstract:
  This Fifth International WEIN Symposium is devoted to physics beyond the
standard model. This talk is about tau lepton physics, but I begin with the
question: do we know how to find new physics in the world of elementary
particles? This question is interwoven with the various tau physics topics.
These topics are: searching for unexpected tau decay modes; searching for
additional tau decay mechanisms; radiative tau decays; tau decay modes of the
W, B, and D; decay of the Z^0 to tau pairs; searching for CP violation in tau
decay; the tau neutrino, dreams and odd ideas in tau physics; and tau research
facilities in the next decades.


title: Non SUSY Unification in Left-Right Models

abstract:
  We explore in a model independent way the possibility of achieving the non
supersymmetric gauge coupling unification within left-right symmetric models,
with the minimal particle content at the left-right mass scale which could be
as low as 1 TeV in a variety of models, and with a unification scale M in the
range $10^5$ GeV $< M< 10^{17.7}$ GeV.


title: An [SU(3)]^4 Supersymmetric grand unified model

abstract:
  We present a grand unified model based on the supersymmetric $SU(3)_L\otimes
SU(3)_{CL}\otimes SU(3)_{CR}\otimes SU(3)_R$ gauge group, which unifies in one
single step the three gauge couplings of the standard model at an scale $M\sim
10^{18}$ GeV, and spontaneously breaks down to $SU(3)_c\otimes U(1)_{EM}$ using
only fundamental representations of SU(3). In this model the proton decay is
highly suppressed and the doublet-triplet problem is lessened. The see-saw
mechanism for the neutrinos is readily implemented with the use of an extra
tiny mass sterile neutral particle for each generation which provides a natural
explanation to the neutrino puzzle.


title: Comment on Radiative Neutrino Mass Matrix with a Sterile Neutrino

abstract:
  A mechanism of radiatively generating neutrino masses is implemented in an
SU(2)_L x U(1)_Y x SU(2)'_L x U(1)'_Y model, where the first and second
families respect SU(2)_L x U(1)_Y while SU(2)'_L x U(1)'_Y is specific for the
third family. The fourth neutrino, nu_s, that has a U(1)_Y x U(1)'_Y coupling
joins in the model to induce neutrino mixings by additional interactions with e
and mu. The phenomenologically consistent oscillation of nu_s - nu_e requires a
dominated coupling of nu_s to e.


title:
MarKov-Yukawa Transversality On Covariant Null Plane: Pion Form Factor,
  Gauge Invariance And Lorentz Completion

abstract:
  The Markov-Yukawa Transversality Principle (MYTP) on a 2-body Bethe-Salpeter
kernel is formulated on a covariant Null Plane (NP) to reconstruct the 4D BS
wave function for 2 fermion quarks in terms of 3D entities that satisfy a 3D
BSE. This result is the null-plane counterpart of a 3D-4D interconnection for
the 2-body BS wave functions found earlier by imposing MYTP covariantly in the
instantaneous rest frame (termed CIA) of the composite. This formulation yields
a 3D BSE which is formally identical to its Covariant Instantaneity form, thus
fully preserving its spectral results, while ensuring full covariance. More
importantly, the reconstructed 4D vertex functions in the covariant null-plane
ensure that 4D quark-loops are now free from ill-defined time-like momentum
integrations (which had plagued the earlier CIA vertex functions), while a
simple prescription of `Lorentz completion' in the new description yields a
manifestly Lorentz-invariant result.This is illustrated for the pion and kaon
form factors with full QED gauge-invariance, showing a $k^{-2}$ behaviour at
large $k^2$, and `correct' slopes at small $k^2$. This method is compared with
the Kadychevsky-Karmanov light-front formalism.


title: The masses and decay widths of heavy hybrid mesons

abstract:
  We first derive the mass sum rules for the heavy hybrid mesons to obtain the
binding energy and decay constants in the leading order of HQET. The pionic
couplings between the lightest $1^{-+}$ hybrid $(Q\bar q g)$ and the lowest
three heavy meson doublets are calculated with the light cone QCD sum rules.
With $SU_f (3)$ flavor symmetry we calculate the widths for all the possible
two-body decay processes with a Goldstone boson in the final state. The total
width of the $1^{-+}$ hybrid is estimated to be 300 MeV. We find the dominant
decay mode of the $1^{-+}$ hybrid is $1^{-+}\to \pi + 1^+$ where the $1^+$
heavy meson belongs to the $(1^+,2^+)$ doublet. Its branching ratio is about
80% so this mode can be used for the experimental search of the lowest heavy
hybrid meson.


title:
Topological Defects in the Left-Right Symmetric Model and their
  Relevance to Cosmology

abstract:
  It is shown that the minimal left-right symmetric model admits cosmic string
and domain wall solutions. The cosmic strings arise when the SU(2)_R is broken
and can either be destabilized at the electroweak scale or remain stable
through the subsequent breakdown to U(1)_{EM}. The strings carry zero modes of
the neutrino fields. Two distinct domain wall configurations exist above the
electroweak phase transition and disappear after that. Thier destablization
provides new sources of non-equilibrium effects below the electroweak scale
which is relevant to baryogenesis.


title: SUSY Particle Production at Hadron Colliders

abstract:
  The determination of the full SUSY QCD corrections to the production of
squarks, gluinos and gauginos at hadron colliders is reviewed. The NLO
corrections stabilize the theoretical predictions of the various production
cross sections significantly and lead to sizeable enhancements of the most
relevant cross sections. We discuss the phenomenological consequences of the
results on present and future experimental analyses.


title: Field-induced axion decay $a \to e^+ e^-$ via plasmon

abstract:
  The axion decay $a \to e^+ e^-$ via a plasmon is investigated in an external
magnetic field. The results we have obtained demonstrate a strong catalyzing
influence of the field as the axion lifetime in the magnetic field of order
$10^{15}$ G and at temperature of order 10 MeV is reduced to $10^4$ sec.


title: Double Asymptotic Scaling in Drell-Yan Processes

abstract:
  Double scaling may be observed in the Drell-Yan process at the Tevatron and
in the ALICE detector at the Large Hadron Collider in a window of masses. In
the double scaling limit of the cross section, the higher order QCD corrections
are quite large, and are driven by the rise in gluon densities in the double
scaling regime. The naive parton model cannot be valid even at asymptotic
energies in the region of phase space where double scaling holds.


title: Gluon Condensate and Parton Propagation in a Quark-Gluon Plasma

abstract:
  A calculation of the thermal quark propagator is presented taking the gluon
condensate above the critical temperature into account. The quark dispersion
relation following from this propagator is derived.


title: Production of Light Fermion-Antifermion Pairs in gamma gamma Collisions

abstract:
  The $O(\alpha)$ corrections to $\gamma\gamma --> f \bar f$ in the Standard
Model are calculated for arbitrary, light fermions $f$. The relevant analytical
results are listed in a form that is appropriate for practical applications,
and numerical results for integrated cross sections are discussed. The
corresponding QED corrections are generally of the order of some per mille for
arbitrary energies. The weak corrections to $\gamma\gamma --> e^-e^+$ are
negligible below the electroweak scale, reach the per-cent level at a few
hundred GeV and grow to about -10% at 2TeV. The weak corrections to $u \bar u$
and $d \bar d$ production have a shape similar to the one for $e^-e^+$, but
they are larger by factors $\sim 1.4$ and $\sim 3$, respectively.


title: Predictions for Fermion-Pair Production at LEP

abstract:
  The status of predictions for fermion-pair production at LEP is summarized
with emphasis on LEP2 energies and on the physics interest there. Some
numerical comparisons with other programs are performed. We also present first
results of a semi-analytical recalculation of photonic corrections with
acollinearity cut in the ZFITTER approach.


title: Real-Time Dynamics with Fermions on a Lattice

abstract:
  The 1+1 dimensional abelian Higgs model with fermions is a toy model for the
theory of electroweak baryogenesis. We study the dynamics of the model with
axially coupled fermions in real-time. The model is defined on a spacetime
lattice to preserve gauge invariance and to obtain numerical stability in a
simple way. We take into account the phenomenon of lattice fermion doubling.
The dynamics is approximated by treating the inhomogeneous Bose fields
classically, which is justified in a large N_f approximation. The back reaction
on the Bose fields due to fermion field fluctuations is calculated using a mode
function expansion. We discuss and present numerical results for the response
of fermions to sphaleron transitions, the renormalizability of the effective
equations of motion and non-perturbative dynamics in the framework of
non-equilibrium quantum field theory. The long-time behaviour of the system is
discussed and we speculate about applications to finite density calculations.


title: Dynamics of QCD at large $N_c$

abstract:
  Dynamics of confinement, chiral symmetry breaking and thermal phase
transition is considered at large $N_c$. It is argued that these phenomena are
quantitatively well described within the Gaussian stochastic model of the QCD
vacuum. Selfconsistent equations are written for the field correlators of the
model, yielding important connection between gluonic correlation length of the
vacuum and the string tension. Comparison to other approaches and experimental
and lattice data is given.


title: Next-to-Leading Order Cross Sections for Tagged Reactions

abstract:
  We extend the phase space slicing method of Giele, Glover and Kosower for
performing next-to-leading order jet cross section calculations in two
important ways: we show how to include fragmentation functions and how to
include massive particles. These extensions allow the application of this
method to not just jet cross sections but also to cross sections in which a
particular final state particle, including a $D$ or $B$-meson, is tagged.


title:
Angular pattern of minijet transverse energy flow in hadron and nuclear
  collisions

abstract:
  The azimuthal asymmetry of minijet system produced at the early stage of
nucleon-nucleon and nuclear collisions in a central rapidity window is studied.
We show that in pp collisions the minijet transverse energy production in a
central rapidity window is essentially unbalanced in azimuth due to asymmetric
contributions in which only one minijet hits the acceptance window. We further
study the angular pattern of transverse energy flow generated by semihard
degrees of freedom at the early stage of high energy nuclear collisions and its
dependence on the number of semihard collisions in the models both including
and neglecting soft contributions to the inelastic cross section at RHIC and
LHC energies as well as on the choice of the infrared cutoff.


title: QCD sum rule analysis of the field strength correlator

abstract:
  The gauge invariant two-point correlator for the gluon field strength tensor
is analysed by means of the QCD sum rule method. To this end, we make use of a
relation of this correlator to a two-point function for a quark-gluon hybrid in
the limit of the quark mass going to infinity. From the sum rules a relation
between the gluon correlation length and the gluon condensate is obtained. We
briefly compare our results to recent determinations of the field strength
correlator on the lattice.


title: High-Energy Tests of Lorentz Invariance

abstract:
  We develop a perturbative framework with which to discuss departures from
exact Lorentz invariance and explore their potentially observable
ramifications. Tiny non-invariant terms introduced into the standard model
Lagrangian are assumed to be renormalizable (dimension $\le 4$), invariant
under $SU(3)\otimes SU(2)\otimes U(1)$ gauge transformations, and rotationally
and translationally invariant in a preferred frame. There are a total of 46
independent TCP-even perturbations of this kind, all of which preserve anomaly
cancellation. They define the energy-momentum eigenstates and their maximal
attainable velocities in the high-energy limit. The effects of these
perturbations increase rapidly with energy in the preferred frame, more rapidly
than those of TCP-odd perturbations. Our analysis of Lorentz-violating
kinematics reveals several striking new phenomena that are relevant both to
cosmic-ray physics ({\it e.g.,} by undoing the GZK cutoff) and neutrino physics
({\it e.g.,} by generating novel types of neutrino oscillations). These may
lead to new and sensitive high-energy tests of special relativity.


title: Unitarity corrections to K+ -> pi+ gamma l+l-

abstract:
  We perform a chiral one-loop calculation of the unitarity corrections to the
processes K+ -> pi+ gamma l+l- up to O(E^6), taking into account pi+pi-
intermediate states. Branching ratios and differential branching ratios are
computed and presented to demonstrate the importance of the above corrections.


title:
The Spin Structure of the Nucleon (Lectures at the 13th Lake Louise
  Winter Institute)

abstract:
  This paper gives a pedagogical introduction to our knowledge of the spin
structure of the nucleon. In particular, polarised deep inelastic lepton
scattering is presented as a tool to study how the nucleon's constituents
combine to generate its spin. The importance of semi-inclusive measurements is
discussed and a window on future experiments in the field is given.


title: Partial Yukawa unification and a supersymmetric origin of flavor mixing

abstract:
  In a large class of supersymmetric SO(10) and left-right models, requiring
that the effective theory below the scale of $SU(2)_R$ breaking be the MSSM
implies partial Yukawa unification with $Y_u=Y_d$ and $Y_e=Y_{\nu^D}$. The same
result also emerges in models with a horizontal $SU(3)_H$ symmetry. As a
result, at the tree level, these models lead to vanishing quark mixing angles.
We show that the correct mixing pattern can be generated in these models at the
loop level from the flavor structure associated with the supersymmetry breaking
terms. We generalize the constraints on supersymmetric parameters from flavor
changing neutral current (FCNC) processes to include several squark mass
insertions and confirm the consistency of the scheme. The expectations of this
scheme for CP violating observables in the $B$ meson system are quiet different
from the KM model, so it can be tested at the B factories.


title:
Partial coherence in the core/halo picture of Bose-Einstein n-particle
  correlations

abstract:
  We study the influence of a possible coherent component in the boson source
on the two-, three- and $n$-particle correlation functions in a generalized
core/halo type of boson-emitting source. In particular, a simple formula is
presented for the strengh of the $n$-particle correlation functions for such
systems. Graph rules are obtained to evaluate the correlation functions of
arbitrary high order. The importance of experimental determination of the 4-th
and 5-th order Bose-Einstein correlation function is emphasized.


title: A Generalised Area Law for Hadronic String Reinteractions

abstract:
  A new model for hadronic string reinteractions based on a generalised area
law is presented. The model describes both the hadronic final states in
$e^+e^-$ annihilation and the diffractive structure function in deep inelastic
scattering. The model also predicts a shift in the W-mass reconstructed from
hadronic decays of W-pairs of the order 65 MeV.


title: Nontriviality of the Linear Sigma Model

abstract:
  We consider techniques (based on an ultraviolet cutoff) used to prove that
the pure boson ($\phi^4)_4$ field theory is trivial and apply them instead to
the dynamically generated quark-level linear sigma model. This cutoff approach
leads to the conclusion that the latter field theory is in fact nontrivial.


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

abstract:
  The axion decay $a \to e^+ e^-$ is investigated in the presence of a plasma
and an external magnetic field. The results demonstrate a strong catalyzing
influence of medium. The axion lifetime in the magnetic field of order
$10^{15}$ G and at the temperature of order 10 MeV is reduced to $10^4$ s.


title: Natural Maximal ny_my - ny_tau Mixing

abstract:
  The naturalness of maximal mixing between myon- and tau-neutrinos is
investigated. A spontaneously broken nonabelian generation symmetry can explain
a small parameter which governs the deviation from maximal mixing. In many
cases all three neutrino masses are almost degenerate. Maximal
ny_my-ny_tau-mixing would indicate that the leading contribution to the light
neutrino masses arises from the expectation value of a heavy weak triplet
rather than from the seesaw mechanism. In this scenario the deviation from
maximal mixing is predicted to be less than about 1%.


title: Topologies of the (M+1)SSM with a Singlino LSP at LEP2

abstract:
  We study the possible signals of the (M+1)SSM with a singlino LSP at LEP2.
First we identify regions of the parameter space which are ruled out by
negative results of sparticle searches in the context of the MSSM. In the
remaining kinematically accessible regions we present total event rates for
topologies which require further studies, i.e. estimations of the corresponding
efficiencies: various 4 charged fermion final states with missing energy,
possibly with displaced vertices due to a long lifetime of the NLSP, the second
lightest neutralino. Searches for these unconventional signatures are essential
in order to cover the entire kinematically accessible parameter space of the
(M+1)SSM with a singlino LSP at LEP2.


title: Instantons and the singlet-coupling in the chiral quark model

abstract:
  Chiral quark model with a broken-U(3) flavor symmetry can be interpreted as
the effective theory of the instanton-dominated non-perturbative QCD. This
naturally suggests the possibility of a negative singlet/octet coupling ratio,
which has been found, in a previous publication, to be compatible with the
phenomenological description of the nucleon spin-flavor structure.


title: Soft Pomeron and Lower-Trajectory Intercepts

abstract:
  We present a preliminary report on the determination of the intercepts and
couplings of the soft pomeron and of the rho/omega and f/a trajectories from
the largest data set available for all total cross sections and real parts of
the hadronic amplitudes. Factorization is reasonably satisfied by the pomeron
couplings, which allows us to make predictions on gamma gamma and gamma p total
cross sections. In addition we show that these data cannot discriminate between
fits based on a simple Regge pomeron-pole and on an asymptotic log^2s-type
behaviour, implying that the effect of unitarisation is negligible. Also we
examine the range of validity in energy of the fit, and the bounds that these
data place on the odderon and on the hard pomeron.


title: Decay of heavy-light hybrids in HQET sum rules

abstract:
  The decay widths of the 0^{++} and 1^{-+} heavy-light hybrids to B(D) and
pion are calculated by using the QCD sum rules. The interpolated current of the
hybrid is chosen as $g\bar q\gamma_{\alpha}G_{\alpha\mu}^aT^ah_{\it v}(x)$. In
order to simplify the calculation and avoid the ambiguity of three-point
correlation function, a two-point correlation function between the pion and
vacuum is used instead. The decay width of the $0^{++}\to B(D)$ is about 12(16)
MeV while the $1^{-+}\to B(D)$ is around 0.4(1.8) MeV. We keep the leading
order of 1/M_Q expansion in our calculation for convenience.


title:
Perturbative QCD and Power Corrected Hadron Spectra and Spectral Moments
  in the Decays $B \to X_s \ell^+ \ell^-$

abstract:
  Leading order (in $\alpha_s$) perturbative QCD and power ($1/m_b^2)$
corrections to the hadronic invariant mass and hadron energy spectra in the
decay $B \to X_s \ell^+ \ell^-$ are reviewed in the standard model using the
heavy quark expansion technique (HQET). In particular, the first two hadronic
moments $<S_H^n>$ and $<E_H^n>$, $n=1,2$, are presented working out their
sensitivity on the HQET parameters $\lambda_1$ and $\bar{\Lambda}$. Data from
the forthcoming B facilities can be used to measure the short-distance
contribution in $B \to X_s \ell^+ \ell^-$ and determine the HQET parameters
from the moments $<S_H^n>$. This could be combined with complementary
constraints from the decay $B \to X \ell \nu_\ell$ to determine these
parameters precisely.


title: Light-cone wave functions of mesons

abstract:
  A review of light-cone, covariant and gauge-invariant wave-functions of
mesons is presented. They are basic non-perturbative objects needed for hard
exclusive processes and for the method of light-cone QCD sum rules. The
emphasis is on the vector mesons and a new (model-independent) way of computing
the mass corrections of vector-meson wave functions is given.


title: Improved Determination of the b-Quark Mass at the Z Peak

abstract:
  Next-to-leading order calculations of heavy quark three-jet production in e^+
e^- annihilation are reviewed. Their application for the measurement of the
b-quark mass at LEP/SLC and to the test of the flavour independence of the
strong coupling constant are discussed. Prospects for future improvements are
studied.


title: Towards a Theory of Charmless Non-Leptonic Two-Body B Decays

abstract:
  We address a number of theoretical and phenomenological issues in two-body
charmless non-leptonic B decays in the context of a factorization model. A
classification of the exclusive decays involving tree and penguin amplitudes is
reviewed. The role of QCD anomaly in exclusive decays involving an $\eta$ or
$\eta'$ is elucidated and comparison is made with the existing data. We argue
that the factorization approach accounts for most of the observed two-body B
decays.


title: Anomalous Gauge Boson Couplings in the e^+ e^- -> ZZ Process

abstract:
  We discuss experimental aspects related to the $\mathrm{e^+ e^-} \to
\mathrm{Z}\mathrm{Z}$ process and to the search for anomalous ZZV couplings
(V$= \mathrm{Z}, \gamma$) at LEP2 and future $\mathrm{e^+ e^-}$ colliders. We
present two possible approaches for a realistic study of the reaction and
discuss the differences between them. We find that the optimal method to study
double Z resonant production and to quantify the presence of anomalous
couplings requires the use of a complete four-fermion final-state calculation.


title: QED effective action at finite temperature

abstract:
  The QED effective Lagrangian in the presence of an arbitrary constant
electromagnetic background field at finite temperature is derived in the
imaginary-time formalism to one-loop order. The boundary conditions in
imaginary time reduce the set of gauge transformations of the background field,
which allows for a further gauge invariant and puts restrictions on the choice
of gauge. The additional invariant enters the effective action by a topological
mechanism and can be identified with a chemical potential; it is furthermore
related to Debye screening. In concordance with the real-time formalism, we do
not find a thermal correction to Schwinger's pair-production formula. The
calculation is performed on a maximally Lorentz covariant and gauge invariant
stage.


title:
Gauge-invariant Green's functions for the bosonic sector of the standard
  model

abstract:
  There are many applications in gauge theories where the usually employed
framework involving gauge-dependent Green's functions leads to considerable
problems. In order to overcome the difficulties invariably tied to gauge
dependence, we present a manifestly gauge-invariant approach. We propose a
generating functional of appropriately chosen gauge-invariant Green's functions
for the bosonic sector of the standard model. Since the corresponding external
sources emit one-particle states, these functions yield the same S-matrix
elements as those obtained in the usual framework. We evaluate the generating
functional for the bosonic sector of the standard model up to the one-loop
level and carry out its renormalization in the on-shell scheme. Explicit
results for some two-point functions are given. Gauge invariance is manifest at
any step of our calculation.


title: Further Comments on a Vanishing Singlet Axial Vector Charge

abstract:
  The recent suggestion of a vanishing flavor-singlet axial charge of nucleon
due to a nontrivial vacuum structure is further amplified. A perturbative QCD
discussion, applicable for the heavy quark contributions, relates it to the
physics of the decoupling theorem. It is also shown that $g_{A}^{0}\simeq 0$
leads to a negative $\eta'$-meson-quark coupling, which has been found to be
compatible with the chiral quark model phenomenology.


title: Simple unitarity relations among charged current coupling constants

abstract:
  I suggest two new unitarity tests for the quark charged current coupling
constants which are $(sin \gamma/sin \alpha) = \zeta$, and $(sin 2\gamma)/(sin
2\alpha) = - ((1-\zeta cos \beta))/(cos \beta-\zeta)$ where $\zeta$ is a CKM
parameter defined in the text. These unitarity identities do not suffer some of
the multi-value ambiguities. Related problems are discussed. The sign of
$\Delta m_{_{B_d}}$ should satisfy the condition $\Delta m cos 2\beta < 0$.


title: Operator Analysis of L=1 Baryon Masses in Large N_c QCD

abstract:
  We consider in detail the mass operator analysis for the nonstrange L=1
excited baryons in large N_c QCD. We present a straightforward procedure for
constructing the large N_c baryon wavefunctions, and provide complete analytic
expressions for the matrix elements of all the independent isosinglet mass
operators. We discuss the relationship between the old-fashioned operator
analyses based on nonrelativistic SU(6) symmetry and the modern large N_c
approach, which has a firmer theoretical foundation. We then suggest a possible
dynamical interpretation for the subset of operators preferred strongly by the
data.


title:
Correlated Wave Packet treatment of Neutrino and Neutral Meson
  Oscillations

abstract:
  A quantum wave packet treatment of neutrino and neutral K and B meson
oscillations is presented which incorporates the recoil particle in the
production process, and includes the effect of the localization and lifetime of
the source assumed to be a resonance or unstable particle. This approach
removes the ambiguities in the conventional single particle treatment of these
oscillations with the recoil particle. A fundamental connection between the
stochastic decay time of the source and the space-time coordinates of the
correlated final state particles is derived.


title:
Sixth-Order Vacuum-Polarization Contribution to the Lamb Shift of the
  Muonic Hydrogen

abstract:
  The sixth-order electron-loop vacuum-polarization contribution to the
$2P_{1/2} - 2S_{1/2}$ Lamb shift of the muonic hydrogen ($\mu^{-} p^+$ bound
state) has been evaluated numerically. Our result is 0.007608(1) meV. This
eliminates the largest uncertainty in the theoretical calculation. Combined
with the proposed precision measurement of the Lamb shift it will lead to a
very precise determination of the proton charge radius.


title:
Accuracy of Calculations Involving $\alpha^3$ Vacuum-Polarization
  Diagrams: Muonic Hydrogen Lamb Shift and Muon $g-2$

abstract:
  The contribution of the $\alpha^3$ single electron-loop vacuum-polarization
diagrams to the Lamb shift of the muonic hydrogen has been evaluated recently
by two independent methods. One uses the exact parametric representation of the
vacuum-polarization function while the other relies on the Pad\'{e}
approximation method. High precision of these values offers an opportunity to
examine the reliability of the Monte-Carlo integration as well as that of the
Pad\'{e} method. Our examination covers both muonic hydrogen atom and muon
$g-2$. We tested them further for the cases involving two-loop vacuum
polarization, where an exact analytic result is known. Our analysis justifies
the result for the Lamb shift of the muonic hydrogen and also resolves the
long-standing discrepancy between two previous evaluations of the muon $g-2$
value.


title:
General analysis of B decays to two pseudoscalars for EWP, rescattering
  and color suppression effects

abstract:
  A general analysis for B decays to two pseudoscalars, involving ten modes, is
presented. A simple model for final state interactions and rescattering effects
is proposed. We show how the data can be used to deduce important information
on electroweak penguins (EWP), rescattering and color suppression effects and
on the CKM parameters in a largely model independent way by using
chisquared-minimization. We find that the current data suggests the presence of
color-suppressed tree at levels somewhat larger than simple theoretical
estimates. Once the data improves the extraction of alpha and/or gamma may
become feasible with this method as we illustrate with the existing data.


title: Light Quarks in the Instanton Vacuum at Finite Baryon Density

abstract:
  We consider the finite density, zero-temperature behaviour of quark matter in
the instanton picture. Since the instanton-induced interactions are attractive
in both $\bar{q}q$ and $qq$ channels, a competition ensues between phases of
matter with condensation in either or both. It results in chiral symmetry
restoration due to the onset of diquark condensation, a `colour supercondutor',
at finite density. Also present is a state with both manners of condensation,
however this phase is found to be thermodynamically disfavoured for equilibrium
matter. Properties of quark matter in each phase are discussed, with emphasis
on the microscopic effects of the effective mass and superconducting energy
gap.


title: The Running BFKL: Resolution of Caldwell's Puzzle

abstract:
  The HERA data on the proton structure function, $F_2(x,Q^2)$, at very small
$x$ and $Q^2$ show the dramatic departure of the logarithmic slope, $\partial
F_2/\partial\log Q^2$, from theoretical predictions based on the DGLAP
evolution. We show that the running BFKL approach provides the quantitative
explanation for the observed $x$ and/or $Q^2$ -dependence of $\partial
F_2/\partial\log Q^2$.


title: Baryogenesis above the Fermi scale

abstract:
  In the standard model and most of its extensions the electroweak transition
is too weak to affect the cosmological baryon asymmetry. Due to sphaleron
processes baryogenesis in the high-temperature, symmetric phase of the standard
model is closely related to neutrino properties. The experimental indications
for very small neutrino masses from the solar and the atmospheric neutrino
deficits favour a large scale of B-L breaking. For hierarchical neutrino
masses, with B-L broken at the unification scale $\Lambda_{GUT} \sim 10^{16}$
GeV, the observed baryon asymmetry $n_B/s \sim 10^{-10}$ is naturally explained
by the decay of heavy Majorana neutrinos. The corresponding baryogenesis
temperature is $T_B \sim 10^{10}$ GeV. In supersymmetric models implications
for the mass spectrum of superparticles can be derived. A consistent picture is
obtained with the gravitino as LSP, which may be the dominant component of cold
dark matter.


title:
Wave Functions, Evolution Equations and Evolution Kernels from Light-Ray
  Operators of QCD

abstract:
  The widely used nonperturbative wave functions and distribution functions of
QCD are determined as matrix elements of light-ray operators. These operators
appear as large momentum limit of nonlocal hadron operators or as summed up
local operators in light-cone expansions. Nonforward one-particle matrix
elements of such operators lead to new distribution amplitudes describing both
hadrons simultaneously. These distribution functions depend besides other
variables on two scaling variables. They are applied for the description of
exclusive virtual Compton scattering in the Bjorken region near forward
direction and the two meson production process. The evolution equations for
these distribution amplitudes are derived on the basis of the renormalization
group equation of the considered operators. This includes that also the
evolution kernels follow from the anomalous dimensions of these operators.
Relations between different evolution kernels (especially the Altarelli-Parisi
and the Brodsky-Lepage) kernels are derived and explicitly checked for the
existing two-loop calculations of QCD. Technical basis of these results are
support and analytically properties of the anomalous dimensions of light-ray
operators obtained with the help of the $\alpha$-representation of Green's
functions.


title: Polarized Structure Functions in QCD

abstract:
  Hadron spin physics is now one of the most active fields of physics.
Especially in the last ten years, great progress has been made both
theoretically and experimentally that has considerably improved our knowledge
of the spin structure of nucleons. We review the nucleon's polarized structure
functions from the viewpoint of factorization theorems and the gauge invariant,
nonlocal light-cone operators in QCD. We discuss a systematic treatment of the
polarized structure functions and the corresponding parton distribution
functions, which are relevant to inclusive lepto- and hadro-production. We give
a detailed analysis of these spin-dependent distribution functions at the
twist-2 and twist-3 level, and present various properties and relations
satisfied by the parton distributions, which can be derived directly from QCD.
We emphasize unique features of higher twist distributions, and the role of the
QCD equations of motion to derive their sensitivity to the quark-gluon
correlation and their anomalous dimensions for Q^2-evolution.


title: Relations among QCD corrections beyond leading order

abstract:
  The status of various relations among higher order QCD corrections is
discussed. In particular, Drell-Levy-Yan relation and Supersymmetric relation
are studied at the two-loop level. We have also investigated the validity of
such relations for physical observables.


title:
Higher Dimensional Operator Corrections to the Goldstino
  Goldberger-Treiman Vertices

abstract:
  The goldstino-matter interactions given by the Goldberger-Treiman relations
can receive higher dimensional operator corrections of $ O(q^{2}/M^{2})$, where
$M$ denotes the mass of the mediators through which SUSY breaking is
transmitted. These corrections in the gauge mediated SUSY breaking models arise
from loop diagrams, and an explicit calculation of such corrections is
presented. It is emphasized that the Goldberger-Treiman vertices are valid only
below the mediator scale and at higher energies goldstinos decouple from the
MSSM fields. The implication of this fact on gravitino cosmology in GMSB models
is mentioned.


title: Exclusive charmless $B_s$ hadronic decays into $\eta'$ and $\eta$

abstract:
  Using the next-to-leading order QCD-corrected effective Hamiltonian,
charmless exclusive nonleptonic decays of the $B_s$ meson into $\eta$ or
$\eta'$ are calculated within the generalized factorization approach.
Nonfactorizable contributions are included with two different treatments. Some
subtleties involved are discussed.


title: Hadron Diffraction Dissociation and the Triple Pomeron Vertex

abstract:
  Hadron diffraction dissociation is considered in the dipole Pomeron model
where the Pomeron is represented by a double pole in the J-plane. We find that
unitarity is satisfied without decoupling of the triple Pomeron vertex. The
reaction bar{p}+p --> bar{p}+X is analysed.


title: Degenerate Neutrinos and Supersymmetric Inflation

abstract:
  A moderate extension of the minimal supersymmetric standard model which
includes a U(1)_(B-L) gauge group (B and L being the baryon and lepton number)
and a Peccei-Quinn symmetry, U(1)_PQ, is presented. The hybrid inflationary
scenario is automatic and `natural' in this model. The mu problem of the
minimal supersymmetric standard model is solved by coupling the electroweak
higgses to fields which break U(1)_PQ. Baryon number conservation and, thus,
proton stability are automatic consequences of a R-symmetry. Neutrinos are
assumed to acquire degenerate masses of about 1.5 eV by coupling to SU(2)_L
triplet superfields, thereby providing the hot dark matter of the universe. The
inflaton decays into these triplets which, via their subsequent decay, produce
a primordial lepton asymmetry later converted into the observed baryon
asymmetry of the universe. The gravitino and baryogenesis constraints can be
satisfied with `natural' values (of order 10^{-3}) of the relevant coupling
constants.


title: W Production in an Improved Parton-Shower Approach

abstract:
  In the description of the production properties of gauge bosons (W+/W-, Z0,
gamma) at colliders, the lowest-order graph normally is not sufficient. The
contributions of higher orders can be introduced either by an explicit
order-by-order matrix-element calculation, by a resummation procedure or by a
parton-shower algorithm. Each approach has its advantages and disadvantages. We
here introduce a method that allows the parton-shower algorithm to be augmented
by higher-order information, thereby offering an economical route to a
description of all event properties. It is tested by comparing with the pT
spectrum of W bosons at the Tevatron.


title:
The quark part of the non-forward BFKL kernel and the ``bootstrap'' for
  the gluon Reggeization

abstract:
  We calculate the quark part of the kernel of the generalized non-forward BFKL
equation at non-zero momentum transfer $t$ in the next-to-leading logarithmic
approximation. Along with the quark contribution to the gluon Regge trajectory,
this part includes pieces coming from the quark-antiquark production and from
the quark contribution to the radiative corrections in one-gluon production in
the Reggeon-Reggeon collisions. The results obtained can be used for an
arbitrary representation of the colour group in the $t-$channel. Using the
results for the adjoint representation, we demonstrate explicitly the
fulfillment of the ``bootstrap'' condition for the gluon Reggeization in the
next-to-leading logarithmic approximation in the part concerning the quark
contribution.


title: Four Issues in Correlations and Fluctuations

abstract:
  Introductory talk at the Session on Correlations and Fluctuations of the
XXVII International Symposium on Multiparticle Dynamics held in Delphi, Greece,
from 6th till 11th of September 1998.


title:
Photoproduction of Heavy Vector Mesons at HERA -- A Testfield for
  Diffraction

abstract:
  Exclusive diffractive photoproduction of heavy vector mesons (V=phi, J/psi
and Upsilon) at HERA is studied in a model employing a dipole Pomeron exchange
(P) with an inelastic gamma-P-V vertex. The model is fitted to the data on
dsigma/dt, B and elastic sigma for Q^2=0 and beyond the threshold region. The
elastic cross sections for both phi and J/psi photoproduction show a moderate
increase within the HERA energy region. The flattening of the slope B(s)
(little or no shrinkage) for J/psi is not correlated with the slope of the
Pomeron trajectory. Estimates for Upsilon photoproduction at HERA are given.


title: High Density Parton Shadowing Corrections in DIS Scaling Violations

abstract:
  The description of the dynamics at high density parton regime is one of the
main open questions of the strong interactions theory. In this paper we address
the shadowing corrections (SC) in the scaling violations of the $F_2$ structure
function using the eikonal approach. We propose a procedure to estimate the
distinct contributions to the SC for $F_2$ and its slope and show that the
recent ZEUS data can be described if the SC in the quark and gluon sectors are
considered. The radius dependence of the SC is estimated. Moreover, we
calculate the superior limit above which the unitarity corrections cannot be
disregarded at low $Q^2$ and show that the recent HERA data overcomes this
bound.


title: Heavy Quark Fragmentation

abstract:
  I present the main aspects of open charm production in $\pi^-\p$ collisions
in the context of the Lund String Fragmentation Model as implemented in the
Monte Carlo program PYTHIA. The emphasis is on the transition from large to
small strings and the dependence on model parameters. A modified version is
presented and compared with experimental results both on asymmetries,
single-charm spectra and correlations.


title: Precocious asymptopia for charm from the running BFKL

abstract:
  The running BFKL equation gives rise to a series of moving poles in the
complex j-plane. Corresponding eigenfunctions (color dipole cross sections) are
the oscillating functions of the color dipole size $r$. The first nodes for all
sub-leading solutions (color dipole cross sections) accumulate at $r_1\sim 0.1
fm$. Therefore the processes dominated by the dipole sizes $r\sim r_1$ are free
of sub-leading BFKL corrections. A practically important example - the
leptoproduction of charm. In a wide range of $Q^2$ the calculated
$F_2^{cc}(x,Q^2)$ is exhausted by the leading BFKL pole and gives a perfect
description of the experimental data.


title: Atmospheric neutrinos from charm

abstract:
  Using next-to-leading order perturbative QCD, we find that the charm
contribution to the atmospheric lepton fluxes dominates over the conventional
ones from pi and K decays for energies higher than 10^5 GeV. We also discuss
theoretical uncertainties involved in the calculations and compare our results
with previous evaluations.


title:
Neutrinoless double beta decay in Supersymmetry with bilinear R-parity
  breaking

abstract:
  We reanalyze the contributions to neutrinoless double beta ($\znbb$) decay
from supersymmetry with explicit breaking of R-parity. Although we keep both
bilinear and trilinear terms, our emphasis is put on bilinear R-parity breaking
terms, because these mimic more closely the models where the breaking of
R-parity is spontaneous. Comparing the relevant Feynman diagrams we conclude
that the usual mass mechanism of double beta decay is the dominant one. From
the non-observation of $\znbb$ decay we set limits on the bilinear R-parity
breaking parameters of typically a (few) 100 $keV$. Despite such stringent
bounds, we stress that the magnitude of R-parity violating phenomena that can
be expected at accelerator experiments can be very large, since they involve
mainly the third generation, while $\znbb$ decay constrains only the first
generation couplings.


title:
A simple Dirac wave function for a Coulomb potential with linear
  confinement

abstract:
  A simple analytical solution is found to the Dirac equation for the
combination of a Coulomb potential with a linear confining potential. An
appropriate linear combination of Lorentz scalar and vector linear potentials,
with the scalar part dominating, can be chosen to give a simple Dirac wave
function. The binding energy depends only on the Coulomb strength, and is not
affected by the linear potential. The method works for the ground state, or for
the lowest state with $l=j-{1/2}$, for any $j$.


title: On the running electromagnetic coupling constant at $M_Z$

abstract:
  We present a discussion on how to define the running electromagnetic coupling
constant at $M_Z$ or some other intermediate scale as e.g. $m_\Upsilon$. We
argue that a natural definition consistent with general requirements of the
renormalization group should be based on Euclidean values of the momentum of
the photon propagator as the appropriate scale. We demonstrate in an explicit
example of evaluating the running coupling constant at the scale of the
$\Upsilon$ resonance mass that the usual definition of the hadronic
contribution with a principal value prescription is inconsistent. In the
determination of the value of $\alpha$ at $M_Z$ the numerical difference due to
using a Euclidean definition rather than the principal value one is comparable
in size to the errors caused by existing experimental and QCD inputs to the
evaluation of $\alpha(M_Z)$.


title: Beating the Standard Model

abstract:
  This report, adapted from my talk at the 1998 Ettore Majorana Subnuclear
School at Erice, proffers speculative explanations of the strong CP problem and
the existence of cosmic rays beyond the GZK bound. It is based on works done
with Sidney Coleman and Howard Georgi.


title: Hard Exclusive Electroproduction of Pions

abstract:
  We investigate the exclusive electroproduction of pi^+ mesons from nucleons.
To leading twist, leading order alpha_s accuracy the corresponding production
amplitude can be decomposed into pseudovector and pseudoscalar parts. Both can
be expressed in terms of quark double distribution functions of the nucleon.
While the pseudovector contribution is connected to ordinary polarized quark
distributions, the pseudoscalar part can be related to one pion t-channel
exchange. We observe that the pseudovector part of the production amplitude is
important at x < 0.1. On the other hand, for 0.1 < x < 0.4 contributions from
one pion exchange dominate.


title: A Goldstone Boson Primer

abstract:
  These lectures are an extremely condensed version of the theory of Goldstone
bosons, with general features illustrated using a simple model. A more
comprehensive version of these lectures, which includes a general discussion of
effective theories of Goldstone bosons, including applications to the
low-energy behaviour of pions, spin waves (in antiferromagnets and
ferromagnets), and to the SO(5) proposal for high-T_c superconductors may be
found in hep-th/9808176.


title: Hybrid quarkonium masses up to the order of ${\cal O}(1/m_Q)$

abstract:
  We have calculated the binding energy of the hybrid quarkonium up to the
order of ${\cal O}(1/m_Q)$ and found their decay constants scale like
$m_Q^{5/4}$ as $m_Q\to \infty$. The $0^{--}$ and $0^{++}$ hybrid quarkonium is
exactly degenerate in the limit of $m_Q\to\infty$ while the ${\cal O}(1/m_Q)$
correction renders the $0^{--}$ mass lower than that for $0^{++}$. The $1^{-+}$
and $1^{+-}$ hybrid is nearly degenerate and lies 0.7 GeV lower than $0^{--}$.
With $m_b=4.8$GeV the mass of $1^{-+}$ $b\bar b g$ state is $(10.75\pm 0.10)$,
which is the lightest exotic hybrid quarkonium.


title: An Ode to Effective Lagrangians

abstract:
  A brief introduction is given to the methods and spirit of effective
lagrangians. The emphasis is on a summary of the overall picture, using a
simple model as the vehicle to motivate and illustrate the main points.
Powercounting is illustrated by estimating the size of the quantum corrections
to the predictions of classical gravity.


title: Matrix Elements of Electroweak Penguin Operators in the 1/Nc Expansion

abstract:
  It is shown that the K -> pi pi matrix elements of the four-quark operator
Q_7, generated by the electroweak penguin-like diagrams of the Standard Model,
can be calculated to first non-trivial order in the chiral expansion and in the
1/Nc expansion. Although the resulting B factors B_7^(1/2) and B_7^(3/2) are
found to depend only logarithmically on the matching scale, mu, their actual
numerical values turn out to be rather sensitive to the precise choice of mu in
the GeV region. We compare our results to recent numerical evaluations from
lattice-QCD and to other model estimates.


title:
The Masses of the Neutral CP-even Higgs Bosons in the MSSM: Accurate
  Analysis at the Two-Loop Level

abstract:
  We present detailed results of a diagrammatic calculation of the leading
two-loop QCD corrections to the masses of the neutral CP-even Higgs bosons in
the Minimal Supersymmetric Standard Model (MSSM). The two-loop corrections are
incorporated into the full diagrammatic one-loop result and supplemented with
refinement terms that take into account leading electroweak two-loop and
higher-order QCD contributions. The dependence of the results for the
Higgs-boson masses on the various MSSM parameters is analyzed in detail, with a
particular focus on the part of the parameter space accessible at LEP2 and the
upgraded Tevatron. For the mass of the lightest Higgs boson, m_h, a parameter
scan has been performed, yielding an upper limit on m_h which depends only on
tan(beta). The results for the Higgs-boson masses are compared with results
obtained by renormalization group methods. Good agreement is found in the case
of vanishing mixing in the scalar quark sector, while sizable deviations occur
if squark mixing is taken into account.


title: Effect of magnetic field on electron neutrino sphere in pulsars

abstract:
  We study the neutrino interaction rates through charged as well as neutral
current weak interactions in hot, dense magnetized matter. At densities near
the neutrino sphere, matter in the presence of intense magnetic field is
polarized and electrons and protons typically occupy the lowest Landau level.
The weak interaction rates in such a situation are severally modified leading
to a sizable change in neutrino opacity and consequently on the location of the
neutrino sphere which also gets distorted. This has implications for pulsar
velocity explanations.


title:
Coulomb corrections to the three-body correlation function in
  high-energy heavy ion reactions

abstract:
  Starting from an asymptotically correct three-body Coulomb wave-function, we
determine the effect of Coulomb final state interaction on the three-particle
Bose-Einstein correlation function of similarly charged particles. We
numerically estimate that the Riverside approximation is not precise enough to
determine the three-body Coulomb correction factor in the correlation function,
if the characteristic HBT radius parameter is 5 - 10 fm, which is the range of
interest in high-energy heavy ion physics.


title:
A Simple Grand Unification View of Neutrino Mixing and Fermion Mass
  Matrices

abstract:
  Assuming three light neutrinos and the see-saw mechanism we present a
semiquantitative model of fermion masses based on (SUSY) SU(5) and abelian
horizontal charges. A good description of the observed pattern of quark and
lepton masses is obtained. For neutrinos we naturally obtain widely split
masses and large atmospheric neutrino mixing as a consequence of SU(5)-related
asymmetric mass matrices for d quarks and charged leptons.


title: Spinodal Inflation

abstract:
  Out-of-equilibrium, non-perturbative, quantum effects significantly modify
the standard picture of inflation in a wide class of models including new,
natural, and hybrid inflation. We find that the quantum evolution of a single
real inflaton field may be modeled by a classical theory of two homogeneous
scalar fields. We briefly discuss the important observational consequences that
are expected to result.


title: Hadronic fluctuations and quark-antiquark asymmetry in the nucleon

abstract:
  We derive the nucleon non-perturbative sea-quark distributions coming from a
composite model involving quarks and hadronic degrees of freedom. The model
predicts a definite structured quark-antiquark asymmetry in the nucleon sea.


title:
Target Mass Corrections for Polarized Structure Functions and New Sum
  Rules

abstract:
  The target mass corrections are calculated for all structure functions of
neutral and charged current deep inelastic scattering in lowest order in the
coupling constant. Representations of the correction to the twist--2 and
twist--3 contributions are derived both in Mellin-$n$ and $x$-space. The impact
of the target mass corrections on the general relations between the twist--2
and twist--3 parts of the structure functions is studied and three new
relations between the twist--3 contributions are derived.


title: Truncated moments of parton distributions

abstract:
  We derive evolution equations satisfied by moments of parton distributions
when the integration over the Bjorken variable is restricted to a subset (x_0
<= x <= 1) of the allowed kinematical range 0<= x<= 1. The corresponding
anomalous dimensions turn out to be given by a triangular matrix which couples
the N--th truncated moment with all (N + K)--th truncated moments with integer
K >= 0. We show that the series of couplings to higher moments is convergent
and can be truncated to low orders while retaining excellent accuracy. We give
an example of application to the determination of alpha_s from scaling
violations.


title:
Summary of the Workshop ``the QCD Phase Transitions'' Brookhaven
  National Laboratory, November 4-7 1998

abstract:
  This is the full text of the summary talk: copies of transparancies of all
talks with Introduction and Summary would be mailed to participants from
RIKEN/BNL center


title: High $Q^2$ Physics at HERA and Searches for New Particles

abstract:
  Preliminary results from H1 and ZEUS on Deep Inelastic Scattering (DIS) at
high momentum transfer squared $Q^2$ are presented. Used are all available $e^+
p$ data accumulated by the H1 and ZEUS experiments between 1994 and 1997,
corresponding to integrated luminosities of $37 {pb}^{-1}$ and $47 {pb}^{-1}$,
respectively. The anomalies observed at high $Q^2$ in the 1994 to 1996 data
still remain, though with less significance. Since this high $Q^2$ domain
represents a new frontier in DIS, the same data are used to search for new
particles possessing direct couplings to lepton-quark pairs. Assuming that the
slight excess of events observed in Neutral Current DIS is due to a statistical
fluctuation, preliminary limits on the production of leptoquarks and of squarks
in R-parity violating MSSM are presented.


title:
The problem of Chiral Restoration and Dilepton Production in Heavy Ion
  Collisions

abstract:
  In the lecture we review several issues related to recent development in
non-perturbative QCD. The ``instanton liquid model'' reproduces not only the
basic vacuum parameters (the condensates), but even hadronic correlators. New
information obtained from lattice simulations also confirm it. Meanwhile the
model itself was developed into a self-consistent approach, allowing to include
't Hooft interaction to all orders. It was also generalized to non-zero
temperatures and high densities. We discuss one issue, displayed by behavior of
the pion and rho correlation functions: the former has strong non-perturbative
effects at small distances, the latter has none. What happens at $T\sim T_c$
can be answered by dilepton production experiments with heavy ion collisions.
The results definitely indicate large changes in spectral density and "melting"
of the rho meson peak, possibly reaching the rate corresponding to complete
chiral restoration.


title: Brane Inflation

abstract:
  We present a novel inflationary scenario in theories with low scale (TeV)
quantum gravity, in which the standard model particles are localized on the
branes whereas gravity propagates in the bulk of large extra dimensions. This
inflationary scenario is natural in the brane world picture. In the lowest
energy state, a number of branes sit on top of each other (or at an orientifold
plane), so the vacuum energy cancels out. In the cosmological setting, some of
the branes "start out" relatively displaced in the extra dimensions and the
resulting vacuum energy triggers the exponential growth of the 3 non-compact
dimensions. The number of e-foldings can be very large due to the very weak
brane-brane interaction at large distances. In the effective four-dimensional
field theory, the brane motion is described by a slowly rolling scalar field
with an extremely flat plateau potential. When branes approach each other to a
critical distance, the potential becomes steep and inflation ends rapidly. Then
the branes "collide" and oscillate about the equilibrium point, releasing
energy mostly into radiation on the branes.


title: Susy Virtual effects at LEP2 Boundary

abstract:
  We examine the possibility that SUSY particles are light, i.e. have a mass
just beyond the final kinematical reach of LEP2. In this case, even if light
particles are not directly detected, their virtual effects are enhanced by a
``close to threshold'' resonance in the s-channel. We find that this resonant
effect is absent in the case of light sfermions, while it is enhanced in the
case of light gauginos, since neutralinos and charginos add coherently in some
regions of the allowed parameter space. We discuss this ``virtual-alliance'' in
detail and try to examine the possibilities of its experimental verification.


title:
Renormalization group relations and searching for abelian Z' Boson in
  the four-fermionic processes

abstract:
  The method of searching for signals of heavy virtual particles is developed.
It is based on a renormalization group equation for the low energy effective
Lagrangian and the decoupling theorem. As an application, the model independent
search for Abelian Z' boson in four-fermion processes is analyzed. The basic
one-loop renormalization group relation for the parameters of the effective
Lagrangian is derived which gives possibility to reduce the problem to the
scattering of the Standard Model particles in the ``external field''
substituting heavy virtual Z' state. From the set of derived relations it is
determined that the absolute value of the Z' coupling to the axial currents has
to be the same for all fermions and is strongly correlated to the Z' coupling
to the scalar fields. The corresponding dependences between the parameters of
the effective Lagrangians are derived.


title: Large extra dimensions and deep-inelastic scattering at HERA

abstract:
  In scenarios motivated by string theories, it is possible to have extra
Kaluza-Klein dimensions compactified to rather large magnitudes, leading to
large effects of gravity at scales down to a TeV. The effect of the spin-2
Kaluza-Klein modes on the deep-inelastic cross-section at HERA is investigated.
We find that the data can be used to obtain bounds on the effective low energy
scale, $M_S$.


title: Revisiting non-perturbative effects in the jet broadenings

abstract:
  We show that taking into account the interplay between perturbative and
non-perturbative effects, the power-suppressed shift to the broadening
distributions becomes B dependent, and the non-perturbative contribution to the
mean values becomes proportional to 1/(Q\sqrt{\as(Q)}). The new theoretical
treatment greatly improves the consistency of the phenomenology with the notion
of the universality of confinement effects in jet shapes.


title: Associated Higgs Production in the MSSM

abstract:
  We investigate the inclusive production of the Higgs bosons of the minimal
supersymmetric model with a heavy quark pair, ($t {\bar t}$ and $b {\bar b}$),
in e^+e^- collisions at high energies, $\sqrt{s}=500 GeV$ and $\sqrt{s}=1 TeV$.
The ${\cal O}(\alpha_s)$ QCD radiative corrections are included and the
dependence of the production rates on the parameters of the MSSM is explored.
The associated production of a Higgs boson with a $b {\bar b}$ pair receives
large resonant contributions and can have a significant rate.


title:
Supersymmetry and Electroweak breaking from extra dimensions at the
  TeV-scale

abstract:
  We analyze some features of the role that extra dimensions, of radius $R$ in
the TeV$^{-1}$ range, can play in the soft breaking of supersymmetry and the
spontaneous breaking of electroweak symmetry. We use a minimal model where the
gauge and Higgs sector of the MSSM are living in the bulk of five dimensions
and the chiral multiplets in a four-dimensional boundary. Supersymmetry is
broken in the bulk by the Scherk-Schwarz mechanism and transmitted to the
boundary by radiative corrections. The particle spectrum is completely
predicted as a function of a unique $R$-charge. The massless sector corresponds
to the pure Standard Model and electroweak symmetry is radiatively broken with
a light Higgs weighing $\simlt$ 110 GeV. The $\mu$-problem is solved and
Higgsinos, gauginos and heavy Higgses acquire masses $\sim 1/R$. Chiral
sfermions acquire radiative squared-masses $\sim \alpha_i/R^2$. The effective
potential is explicitly computed in the bulk of extra dimensions and some
cosmological consequences can be immediately drawn from it. Gauge coupling
running and unification is studied in the presence of Scherk-Schwarz
supersymmetry breaking. The unification is similar to that in the
supersymmetric theory.


title: Scheme dependence of NLO corrections to exclusive processes

abstract:
  We apply the so-called conformal subtraction scheme to predict perturbatively
exclusive processes beyond leading order. Taking into account evolution
effects, we study the scheme dependence for the photon-to-pion transition form
factor and the electromagnetic pion form factor at next-to-leading order for
different pion distribution amplitudes. Relying on the conformally covariant
operator product expansion and using the known higher order results for
polarized deep inelastic scattering, we are able to predict perturbative
corrections to the hard-scattering amplitude of the photon-to-pion transition
form factor beyond next-to-leading order in the conformal scheme restricted to
the conformal limit of the theory.


title: The Global Colour Model of QCD for Hadronic Process - a Review

abstract:
  The Global Colour Model (GCM) of QCD is a quark-gluon quantum field theory
that very successfully models QCD for low energy hadronic processes. An
effective gluon correlator models the interaction between quark currents.
Functional integral calculus allows the GCM to be hadronised (i.e. expressed in
terms of meson and baryon fields). The dominant configuration of the hadronic
functional integrals is revealed to be the constituent quark effect, and is
identical to one version of the truncated quark Dyson-Schwinger equations
(tDSE). However the GCM shows that hadronic physics requires processes that go
beyond the tDSE. In this review examples of meson and nucleon processes are
given. The GCM also plays a pivotal role in showing how QCD may be related to
many other hadronic models.


title:
A Note on QCD Corrections to the forward backward Asymmetry of b-Quarks
  using Thrust to determine the b-Direction

abstract:
  I discuss one-loop QCD corrections to the forward backward asymmetry of the
b-quark at LEP in a way appropriate to the present experimental procedure. I
try to give insight into the structure of the corrections and elucidate some
questions which have been raised by experimental experts. Furthermore, I
complete and comment on results given in the literature.


title: Where is the Higgs boson?

abstract:
  The status of the Higgs boson search in the Standard Model and beyond it is
presented.


title: Nuclear Matter in Intense Magnetic Field and Weak Processes

abstract:
  We study the effect of magnetic field on the dominant neutrino emission
processes in neutron stars.The processes are first calculated for the case when
the magnetic field does not exceed the critical value to confine electrons to
the lowest Landau state.We then consider the more important case of intense
magnetic field to evaluate the direct URCA and the neutronisation processes. In
order to estimate the effect we derive the composition of cold nuclear matter
at high densities and in beta equilibrium, a situation appropriate for neutron
stars. The hadronic interactions are incorporated through the exchange of
scalar and vector mesons in the frame work of relativistic mean field theory.
In addition the effects of anomalous magnetic moments of nucleons are also
considered.


title:
gamma^* gamma -> pi^0 transition and asymptotics of gamma^* gamma and
  gamma^* gamma^* transitions of other unflavored pseudoscalar mesons

abstract:
  For the spacelike momenta k of the virtual photon gamma^*, the pi^0(p)
gamma^*(k) gamma(k') transition form factor is considered in the coupled
Schwinger-Dyson and Bethe-Salpeter approach in conjunction with the generalized
impulse approximation using the dressed quark-photon-quark vertices of the
Ball-Chiu and Curtis-Pennington type. These form factors are compared with the
ones predicted by the vector meson dominance, operator product expansion, QCD
sum rules, and the perturbative QCD for the large spacelike transferred momenta
k. The most important qualitative feature of the asymptotic behavior, namely
the 1/k^2 dependence, is in our approach obtained in the model-independent way.
Again model-independently, our approach reproduces also the Adler-Bell-Jackiw
anomaly result for the limit of both photons being real. For the case of one
highly virtual photon, we find in the closed form the asymptotic expression
which can be easily generalized both to the case of other unflavored
pseudoscalar mesons P^0 = pi^0, eta_8, eta_0, eta_c, eta_b, and to the case of
arbitrary virtuality of the other photon. Implications thereof for certain
important theoretical and experimental applications are pointed out.