title:
The Pinch Technique Beyond One Loop: The Gauge-Independent Two-Loop
  Quark Self-Energy

abstract:
  It is shown how the pinch technique algorithm may be consistently extended
beyond the one-loop level to obtain the gauge-independent two-loop fermion
self-energy -i\hat\Sigma^(2)(p) in QCD in the pinch technique approach. The
starting point for the construction is the general diagrammatic representation
of the two-loop quark self-energy in terms of renormalized one-loop two- and
three-point function and tree level Bethe-Salpeter-type quark-gluon scattering
kernel insertions in the one-loop quark self-energy. Using factors of
longitudinal gluon four-momentum only from lowest order gauge field propagators
and triple gauge vertices to trigger the relevant Ward identities, the function
-i\hat\Sigma^(2)(p) is explicitly constructed from the consideration of the
two-loop QCD corrections to the Compton scattering of a photon off a quark. It
is shown that the resulting pinch technique self-energy -i\hat\Sigma^(2)(p) is
gauge-independent at all momenta, does not shift the position of the propagator
pole and is multiplicatively renormalizable by local counterterms. The
demonstration of the gauge independence is based on an efficient diagrammatic
method to deal with the several dozen two-loop diagrams involved. It is
explicitly shown by this example that the general correspondence between the
pinch technique n-point functions and those obtained in the background field
method in the Feynman quantum gauge \xi_{Q} = 1 does not persist beyond one
loop.


title: On The Pinch Technique Beyond One Loop

abstract:
  A brief account is given of the problems involved in extended the pinch
technique beyond the one-loop level, and of investigations into one possible
approach to solving them.


title:
The Supersymmetric QCD Radiative Corrections to Top Quark Semileptonic
  Decays

abstract:
  The one-loop supersymmetric QCD corrections to the top quark semileptonic
decays $t\to b \bar{l} {\nu_l}$ are considered. The corrections are found to
reduce the decay width. In the still acceptable parameter space the corrections
to the percentage change in top quark semileptonic decay width can reach the
level of -0.7%.


title: The static potential in QCD to two loops

abstract:
  We evaluate the static QCD potential to two--loop order. Compared to a
previous calculation a sizable reduction of the two--loop coefficient $a_2$ is
found.


title: Consistency of data on soft photon production in hadronic interactions

abstract:
  The glob model of Lichard and Van Hove and the modified soft annihilation
model (MSAM) of Lichard and Thompson are used as a phenomenological tool for
relating results from various experiments on soft photon production in high
energy collisions. The total phenomenological expectation is composed of
contributions from classical bremsstrahlung, the soft annihilation model and
the glob model. The empirical excess above the background from hadronic decays
at very small longitudinal momenta of photons is well reproduced, as well as
that for transverse momenta pT >~ 10 MeV/c. Some data do not require the glob
model and MSAM components in the phenomenological mixture, but do not exclude
them. On the basis of consistency of all data with the total theoretical
expectation we argue that the results of all experiments are mutually
consistent. The models are unable to describe the excess of ultrasoft photons
(pT <~ 10 MeV/c), seen by some, but not all, experiments. This may indicate an
as yet unknown projectile-mass-dependent production mechanism. Possible
relations of soft photon production to other phenomena are discussed. A
simple-to-use, but physically equivalent version of the glob model is
developed, which enables an easy check of presented results.


title: On quantization of gravity

abstract:
  The theory of gravity without free gravitational fields is considered. It is
assumed that gravitational radiation is some hypothetical matter fields.
Gravitational emission is a process of the decay of proton into hypothetical
matter fields at the Planck scale.


title: New Perspectives on the Quest for Unification

abstract:
  Synthesizing older ideas about the 1/N expansion in gauge theory, the quantum
mechanics of black holes, and quantum field theory in Anti de Sitter space, a
new correspondence between gauge theory and quantum gravity has illuminated
both subjects.


title:
A supersymmetric resolution of the anomaly in charmless nonleptonic
  $B$-decays

abstract:
  We examine the large branching ratio for the process $B\to \eta^{\prime} K$
from the standpoint of R parity violating supersymmetry. We have given all
possible $R_p$ violating contributions to $B\to \eta^{\prime} K$ amplitudes. We
find that only two pairs of $\lambda^{\prime}$-type $R_p$ violating couplings
can solve this problem after satisfying all other experimental bounds. We also
analyze those modes where these couplings can appear, {\em e.g.}, $B^\pm \to
\pi^{\pm}K^0$, $B^{\pm,0} \to K^{*\pm,0} \eta^{(\prime)}$, $B^{\pm} \to\phi
K^{\pm}$ etc., and predict their branching ratios. Further, one of these two
pairs of couplings is found to lower the branching ratio of $B^{\pm}\to\phi
K^\pm$, thereby allowing larger $\xi\equiv{1\over N_c}$. This allows us to fit
$B^{\pm}\to \omega K^{\pm}$ and $B^{\pm}\to \omega \pi^{\pm}$, which could not
be done in the SM framework.


title:
SUPERSYMMETRIC DARK MATTER: MSSM and SUGRA schemes in the light of a
  possible annual modulation effect in WIMP direct search

abstract:
  Recently the DAMA/NaI Collaboration reported further indication of a possible
modulation effect in WIMP direct detection. In this note we discuss the
relevance of this result for supersymmetric theories where the neutralino is
the dark matter candidate. We specifically consider the Minimal Supersymmetric
extension of the Standard Model (MSSM) and Supergravity-inspired schemes, with
possible deviations of the unification conditions at the GUT scale in the Higgs
sector. The main results of our analysis show that the annual modulation data
are widely compatible with an interpretation in terms of a relic neutralino as
the major component of dark matter in the Universe. We also discuss the
implications for searches of supersymmetry at accelerators and for indirect
searches of neutralino dark matter.


title:
Formalism for dilepton production via virtual photon bremsstrahlung in
  hadronic reactions

abstract:
  We derive a set of new formulas for various distributions in dilepton
production via virtual photon bremsstrahlung from pseudoscalar mesons and
unpolarized spin-one-half fermions. These formulas correspond to the leading
and sub-leading terms in the Low-Burnett-Kroll expansion for real photon
bremsstrahlung. The relation of our leading-term formulas to previous works is
also shown. Existing formulas are examined in the light of Lorentz covariance
and gauge invariance. Numerical comparison is made in a simple example, where
an "exact" formula and real photon data exist. The results reveal large
discrepancies among different bremsstrahlung formulas. Of all the leading-term
bremsstrahlung formulas, the one derived in this work agrees best with the
exact formula. The issues of M_T-scaling and event generators are also
addressed.


title:
Azimuthal asymmetry as a new handle on $\sigma_{L}/\sigma_{T}$ in
  diffractive DIS

abstract:
  We propose a new method of the determination of
$R^{D}=\sigma_{L}^{D}/\sigma_{T}^{D}$ from the dependence of the diffractive
cross section on the azimuthal angle between the electron scattering and proton
scattering planes. The method is based on our finding of the model independence
of the ratio of the $LT$ interference and transverse diffractive structure
functions. The predicted azimuthal asymmetry is substantial and can be measured
at HERA. We show that the accuracy of our reconstruction of $R^{D}$ is adequate
for a reliable test of an important pQCD prediction of $R^{D}\gsim 1$ for large
$\beta$.


title: The g_(Ko* K pi) coupling constant in QCD

abstract:
  The strong coupling constant g_(Ko* K pi) of the scalar Ko* meson decay to (K
pi) is calculated in light cone QCD sum rule. The predicted value of the
coupling constant g_(Ko* K pi) is in a good agreement with the experimental
result.


title: Summary

abstract:
  This summary is an attempt to overview the wealth of new results and ideas in
quarkonium physics presented at the Seattle Workshop.


title:
Strong WW scattering at the end of the 90's: theory and experimental
  prospects

abstract:
  The nature of electroweak symmetry breaking can only be established
definitively by the direct discovery and detailed study of the symmetry
breaking quanta at high energy colliders. At the LHC the ability to observe TeV
scale strong WW scattering confers a no-lose capability to establish the mass
scale and interaction strength of the symmetry breaking quanta, even if the
symmetry breaking quanta resist discovery and whether strong WW scattering is
observed or excluded. This lecture discusses the motivation to consider strong
WW scattering in light of what we have learned from precision electroweak data
during the decade. The theoretical basis for strong WW scattering is explained
with an introductory review of the Higgs mechanism from a general perspective
that encompasses light, perturbative Higgs bosons or nonperturbative, dynamical
symmetry breaking by TeV scale strong interactions. The experimental signals
and backgrounds are reviewed and the sensitivity of experiments at the LHC is
assessed.


title: A See-saw model of sterile neutrino

abstract:
  If the smallness of the mass of the sterile neutrino is to be explained by
the see-saw mechanism, the off-diagonal entries of the mass matrix needs to be
protected by some symmetry not far above the electroweak scale. We implement
see-saw mechanism in a gauge model based on $SU(2)^q_L \times SU(2)^l_L \times
U(1)^q_Y \times U(1)^l_Y$ un-unified gauge group which breaks to $SU(2)_L
\times U(1)_Y$ at the TeV region via a two-step symmetry breaking chain. The
right handed diagonal block is tied to the highest scale up to which the
un-unification symmetry holds. The sterile neutrino emerges from a quark-lepton
mixed representation of the un-unified group.


title: Introduction to Hadronic B Physics

abstract:
  An overview of the theory of B physics is given, with an emphasis on issues
in the strong interactions and hadronic physics. This article is taken from an
introductory chapter of The BaBar Physics Book - Physics at an Asymmetric B
Factory, SLAC Report SLAC-R-504. It is written at the level of a basic survey
aimed at the experimental community.


title: Charged heavy vector boson production at the Large Hadron Collider

abstract:
  We evaluate the sensitivity of the Large Hadron Collider (LHC) to charged
heavy vector boson production followed by their decays to $W^\pm Z^0$. We
include the correlated decays of the gauge bosons to leptonic final states.
With an integrated luminosity of $10^5$ pb$^{-1}$, charged technirhos in the
minimal SU(N)$_{TC}$ model for $N\geq 7$ yield signals with a significance
larger than 5. In more general models, we explore the range of parameter space
to which LHC experiments will be sensitive. Rapidity correlations exhibiting
enhanced longitudinal gauge boson pair production are also shown.


title: Nonequilibrium Photons as a Signature of Quark-hadron Phase Transition

abstract:
  We study the nonequilibrium photon production in the quark-hadron phase
transition, using the Friedberg-Lee type solitons as a working model for
quark-hadron physics. We propose that to search for nonequilibrium photons in
the direct photon measurements of heavy-ion collisions may be a characteristic
test of the transition from the quark-gluon to hadronic phases.


title: Running of Soft Parameters in Extra Space-Time Dimensions

abstract:
  The evolution of the parameters including those in the soft
supersymmetry-breaking (SSB) sector is studied in the minimal supersymmetric
standard model (MSSM) with a certain set of Kaluza-Klein towers which has been
recently considered by Dienes et al. We use the continuous Wilson
renormalizaion group technique to derive the matching condition between the
effective, renormalizable and original, unrenormalizable theories. We
investigate whether the assumption on a large compactification radius in the
model is consistent with the gauge coupling unification, the $b-\tau$
unification and the radiative breaking of the electroweak gauge symmetry with
the universal SSB terms. We calculate the superpartner spectrum under the
assumption of the universal SSB parameters to find differences between the
model and the MSSM.


title: Physics Projects for a Future CERN-LNGS Neutrino Programme

abstract:
  We present an overview of the future projects concerning the neutrino
oscillation physics in Europe. Recently a joint CERN-LNGS scientific committee
has reviewed several proposals both for the study of atmospheric neutrinos and
for long (LBL) and short baseline (SBL) neutrino oscillation experiments.
  The committee has indicated the priority that the European high energy
physics community should follows in the field of neutrino physics, namely a new
massive, atmospheric neutrino detector and a nu_tau appearance campaign
exploiting the new CERN-LNGS Neutrino Facility (NGS), freshly approved by CERN
and INFN.
  The sensitivity and the discovery potential of the whole experimental program
in the Super-Kamiokande allowed region are discussed.


title:
Is a Standard Model interpretation of the Isolated High Energy Lepton
  and Missing Transverse Momentum HERA events disfavoured?

abstract:
  The H1 collaboration has recently reported the observation of events with an
isolated high energy lepton and missing transverse momentum. All analysed
Standard Model processes were found to fail in explaining the origin of muon
events leaving a statistical fluctuation as the only explanation of their
appearance. In this paper I discuss mechanisms by which Standard Model
processes could either produce or mimic such events and point out several
biases of the H1 analysis which led to an underestimation of their
contribution.


title: Pionic Fluctuations of Constituent Quarks

abstract:
  Pion loop fluctuations of the constituent u and d quarks are shown to give
only a minute contribution to the intrinsic charge radius of the neutron, under
the assumption that the pion-quark coupling constant has its conventional
value, with a cut-off scale of the order of 1.0 GeV. The contribution from the
pion loops to the anomalous magnetic moment of the neutron represents a small
($\sim$ 12-14%) increase over of the static quark model value.


title: Real CP Violation

abstract:
  We propose a new mechanism called "real CP violation" to originate
spontaneous CP violation. Starting with a CP conserving theory with scalar
fields in the adjoint representation of a global or local non-abelian symmetry,
we show that even though the VEV's of such scalars are real they give rise to a
spontaneous violation of CP. We provide an illustrative example of how this new
mechanism of CP violation can give rise to physically significant phases which
produce a complex CKM mixing matrix. This mechanism may prove useful in string
models with moduli in the adjoint representation as well as in tackling the
strong CP problem.


title:
Current tensor with heavy photon for double hard photon emission by
  longitudinally polarized electron

abstract:
  The electron current tensor for the scattering of heavy photon on
longitudinally polarized electron accompanied with two hard real photonsis
considered. The contribution of collinear and semicollinear kinematics is
computed. The obtained result allows to calculate the corresponding
contribution into second order radiative correction to DIS or electron-positron
annihilation cross-sections with the next-to-leading accuracy.


title: A Case of Well-Defined Thermal Derivative Expansion to Lowest Order

abstract:
  We examine a very simple model for which the leading contribution to the
one-loop effective potential at finite temperature is uniquely defined despite
the presence of the Landau terms. In addition we report on the usual
non-analyticity at finite temperature in order to compare our perturbative
results with exact ones obtained in the literature. Finally, we point out the
significance of our conclusions in the context of symmetry restoration at
finite temperature.


title:
Resonant conversions of extremely high energy neutrinos in dark matter
  halos

abstract:
  We study the effect of adiabatically resonant conversion in galactic halos of
neutrinos at the highest energies ($ \sim 10^{20}$ - $10^{22}$ eV), when the
$\nu$ source is in the center of a galaxy. Using the standard neutrino
properties and the standard cosmological scenario for the hot dark part of
matter, we find that interesting conversions may take place just for neutrino
parameters relevant to the solar and atmospheric neutrino problem. The effect
is due to the large enhancement in the $\nu$ density in galactic halos and to
the form of the effective matter potential both below and above the pole of the
$Z$ resonance.


title: Probing SUSY-induced CP violations at B factories

abstract:
  In the minimal supersymmetric standard model (MSSM), the \mu-parameter and
the trilinear coupling A_t may be generically complex and can affect various
observables at B factories. Imposing the edm constraints, we find that there is
no new large phase shift in the B^0 - \bar{B^0} mixing, CP violating dilepton
asymmetry is smaller than 0.1 %, and the direct CP violation in B\to X_s \gamma
can be as large as \sim \pm 16 %.


title: More on higher order decays of the lighter top squark

abstract:
  We discuss the three-body decays stop_1 -> W^+ b neutralino_1, stop_1 -> H^+
b neutralino_1, stop_1 -> b slepton_i neutrino_l, and stop_1 -> b sneutrino_l
l^+$ ($l =e,\mu,\tau$) of the lighter top squark within the minimal
supersymmetric standard model. We give the complete analytical formulas for the
decay widths and present a numerical study in view of an upgraded Tevatron, the
CERN LHC, and a future lepton collider demonstrating the importance of these
decay modes.


title: On the photon constituency of protons

abstract:
  We argue that existing measurements of ep collisions at HERA --in which an
energetic photon is made via a QED `Compton' subprocess-- can provide rather
detailed information on the photonic parton density of the proton. This
function and its deviations from Bjorken scaling should be measurable, allowing
for an interesting test of the theory. The photonic distribution function and
its gluonic counterpart should show a strikingly different evolution with
momentum scale.


title: Hybrid inflation with running inflaton mass

abstract:
  We realize and study a model of hybrid inflation in the context of softly
broken supersymmetry. The inflaton is taken to be a flat direction in the
superfield space and, due to unsuppressed couplings, its soft supersymmetry
breaking mass runs with scale. Both gauge and Yukawa couplings are taken into
account and different inflationary scenarios are investigated depending on the
relative strenght of the couplings and the mass spectrum.


title: Measurements in Gauge Mediated SUSY Breaking Models at LHC

abstract:
  Characteristic examples are presented of scenarios of particle production and
decay in supersymmetry models in which the supersymmetry breaking is
transmitted to the observable world via gauge interactions. The cases are
chosen to illustrate the main classes of LHC phenomenology that can arise in
these models. A new technique is illustrated that allows the full
reconstruction of supersymmetry events despite the presence of two unobserved
particles. This technique enables superparticle masses to be measured directly
rather than being inferred from kinematic distributions. It is demonstrated
that the LHC is capable of making sufficient measurements so as to severely
over-constrain the model and determine the parameters with great precision


title: D-term Inflation and M-theory

abstract:
  Models of supersymmetric D-term inflation require a new mass scale near
10^{15-16} GeV in order to match the density perturbation spectrum observed by
COBE. Attempts to obtain such a scale from the anomalous U(1) of string
theories fail in most string models. However there is hope that models based on
non-standard embeddings in M-theory can solve the discrepancy. We will show
that such models still suffer from the other drawback of D-inflationary models,
namely that Planckian field values are required to drive inflation. Thus it is
hard to understand why the inflaton potential remains so flat without imposing
stringent symmetries on the superpotential. We also examine a fascinating
quasi-fixed point behavior for the gauge coupling of the anomalous U(1) in
these extra-dimensional models, and show that either the presence of large
numbers of fields in the 5-dimensional bulk or strongly suppressed U(1) gauge
couplings is required in order to restore naturality to the inflationary
potential.


title: Beyond the Standard Model for Hillwalkers

abstract:
  In the first lecture, the Standard Model is reviewed, with the aim of seeing
how its successes constrain possible extensions, the significance of the
apparently low Higgs mass indicated by precision electroweak experiments is
discussed, and defects of the Standard Model are examined. The second lecture
includes a general discussion of the electroweak vacuum and an introduction to
supersymmetry, motivated by the gauge hierarchy problem. In the third lecture,
the phenomenology of supersymmetric models is discussed in more detail, with
emphasis on the information provided by LEP data. The fourth lecture introduces
Grand Unified Theories, with emphases on general principles and on neutrino
masses and mixing. Finally, the last lecture contains short discussions of some
further topics, including supersymmetry breaking, gauge-mediated messenger
models, supergravity, strings and $M$ phenomenology.


title:
Determining SUSY Parameters in Chargino Pair-Production in $e^+e^-$
  Collisions

abstract:
  In most supersymmetric theories, charginos $\tilde{\chi}^\pm_{1,2}$, mixtures
of charged color-neutral gauginos and higgsinos, belong to the class of the
lightest supersymmetric particles. They are easy to observe at $e^+e^-$
colliders. By measuring the total cross sections and the left-right asymmetries
with polarized electron beams in $e^+e^-\to\tilde{\chi}_i^-\tilde{\chi}_j^+
[i,j=1,2]$, the chargino masses and the gaugino-higgsino mixing angles can be
determined. From these observables the fundamental SUSY parameters can be
derived: the SU(2) gaugino mass $M_2$, the modulus $|\mu|$ and $\cos \Phi_\mu$
of the higgsino mass parameter, and $\tan\beta = v_2/v_1$, the ratio of the
vacuum expectation values of the two neutral Higgs doublet fields. The
solutions are unique; the CP-violating phase $\Phi_\mu$ can be determined
uniquely by analyzing effects due to the normal polarization of the charginos.


title: Nucleon Spin Puzzle: Ten Years Later

abstract:
  This is a brief survey of the present state of ideas concerning the parton
content of the nucleon spin after their ten-years evolution since the discovery
of the EMC.


title: Low-energy photon-neutrino inelastic processes beyond the Standard Model

abstract:
  We investigate in this work the leading contributions of the MSSM with
R-parity violation and of Left-Right models to the low-energy five-leg
photon-neutrino processes.
  We discuss the results and compare them to the Standard Model ones.


title: Fermion masses and symmetry breaking of a U(2) flavour symmetry

abstract:
  We show how a specific sequential breaking pattern of a U(2) flavour symmetry
occurs automatically in a broad framework. The relative orientation in U(2)
space of the spurion fields that breaks the U(2) symmetry is uniquely fixed,
thus determining the form of the fermion mass matrices in a predictive way.


title: Cosmic-ray antiprotons from neutralino annihilation in the halo

abstract:
  We report the main results of a paper where recent data of low-energy
cosmic-ray $\bar p$ spectrum have been analyzed in terms of newly calculated
fluxes for secondary antiprotons and for a possible contribution of an exotic
signal due to neutralino annihilation in the galactic halo. We also present the
results of a paper in which we have proved that a sizeable fraction of the
supersymmetric neutralino configurations, singled out by the DAMA/NaI data on a
possible annual modulation effect in WIMP direct search, may provide detectable
cosmic-ray antiproton signals.


title: Nucleon structure from the quasithreshold inverse pion electroproduction

abstract:
  The process $\pi N\to e^+e^- N$ (IPE), being a natural and unique laboratory
for studying the hadron electromagnetic structure in the
sub-$N\bar{N}$-threshold time-like region of the virtual-photon ``mass''
$\lambda^2$, turns out to be also very useful for investigating the nucleon
weak structure. A theoretical basis of the methods for extracting practically
model-independent values of the electromagnetic hadron form factors in the
time-like region and for determining the weak structure of the nucleon in the
space-like region from experimental data on IPE at low energies is outlined.
The results of extracting, by those methods, the electromagnetic
$F_1^v(\lambda^2)$ and pseudoscalar $G_P(t)$ form-factors of a nucleon are
presented, where an indication of the existence of the state $\pi^\p$ in the
range 500-800 MeV (possibly the first radial excitation of pion) is obtained,
and the coupling constant of this new state with the nucleon is estimated.


title: The Standard Model

abstract:
  These lectures provide an introduction to the basic aspects of the Standard
Model, $SU(3)_{C} \times SU(2)_{L} \times U(1)_{Y}$.


title:
Interpreting the Neutron's Electric Form Factor: Rest Frame Charge
  Distribution or Foldy Term?

abstract:
  The neutron's electric form factor contains vital information on nucleon
structure, but its interpretation within many models has been obscured by
relativistic effects. I demonstrate that, to leading order in the relativistic
expansion of a constituent quark model, the Foldy term cancels exactly against
a contribution to the Dirac form factor F_1 to leave intact the naive
interpretation of G^n_E as arising from the neutron's rest frame charge
distribution.


title: The Physics of Relic Neutrinos

abstract:
  We report on the main results presented at the workshop on The Physics of
Relic Neutrinos. The study of relic neutrinos involves a broad spectrum of
problems in particle physics, astrophysics and cosmology. Features of
baryogenesis and leptogenesis could be imprinted in the properties of the relic
neutrino sea. Relic neutrinos played a crucial role in the big bang
nucleosynthesis. Being the hot component of the dark matter, they have
participated in the structure formation in the universe. Although the direct
detection of the sea seems impossible at this stage, there could be various
indirect manifestations of these neutrinos which would allow us to study the
properties of the sea both in the past and at the present epoch.


title:
Scheme-Independent Predictions in QCD: Commensurate Scale Relations and
  Physical Renormalization Schemes

abstract:
  Commensurate scale relations are perturbative QCD predictions which relate
observable to observable at fixed relative scale, such as the ``generalized
Crewther relation", which connects the Bjorken and Gross-Llewellyn Smith deep
inelastic scattering sum rules to measurements of the $e^+ e^-$ annihilation
cross section. All non-conformal effects are absorbed by fixing the ratio of
the respective momentum transfer and energy scales. In the case of fixed-point
theories, commensurate scale relations relate both the ratio of couplings and
the ratio of scales as the fixed point is approached. The relations between the
observables are independent of the choice of intermediate renormalization
scheme or other theoretical conventions. Commensurate scale relations also
provide an extension of the standard minimal subtraction scheme, which is
analytic in the quark masses, has non-ambiguous scale-setting properties, and
inherits the physical properties of the effective charge $\alpha_V(Q^2)$
defined from the heavy quark potential. The application of the analytic scheme
to the calculation of quark-mass-dependent QCD corrections to the $Z$ width is
also reviewed.


title:
Triple and Quartic Interactions of Higgs Bosons in the General
  Two-Higgs-Doublet Model

abstract:
  In the case of minimal supersymmetric extension of the Standard Model (MSSM),
when the pseudoscalar Higgs boson mass is less than the supersymmetry energy
scale, the effective theory at the electroweak scale is a two-Higgs-doublet
model. We diagonalize the mass matrix of the general two-Higgs-doublet model,
expressing Higgs boson self-couplings in terms of two mixing angles and four
Higgs boson masses, and derive in a compact form the complete set of Feynman
rules, including quartic couplings in the Higgs sector, for the case of
CP-violating potential. Some processes of double and triple Higgs boson
production at a high-energy linear collider are calculated in the case of
mixing angles and scalar boson masses satisfying the MSSM constraints.


title: Physics with $B \to \eta'$ and $B\to J/\psi$

abstract:
  In this talk I discuss two topics related to B decays. I will first discuss
the Standard Model prediction for $B\to \eta' X_s$, and then discuss how to use
experimental information from $B\to J/\psi K^*$ to test CP violation beyond the
SM.


title: $B \to \eta' X_s$ in the Standard Model

abstract:
  We study $B \to \eta' X_s$ within the framework of the Standard Model.
Several mechanisms such as $b \to \eta' s g$ from the QCD anomaly, and $b \to
\eta's $ and $B\to \eta' s \bar q$ from four-quark operators are treated
simultaneously. We find that the first mechanism give a significant
contribution to the branching ratio for $B\to \eta' X_s$, while the other two
mechanisms account for about 15% of the experimental value. The Standard Model
prediction for $B\to \eta' X_s$ is consistent with the CLEO data.


title: Solar Neutrino Oscillation Diagnostics at Superkamiokande and Sno

abstract:
  Results for solar neutrino detection from the SuperKamiokande collaboration
have been presented recently while those from the Sudbury Neutrino Observatory
are expected in the near future. These experiments are sensitive to the 8B
neutrinos from the sun, the shape of whose spectrum is well-known but the
normalisation is less certain. We propose several variables, insensitive to the
absolute flux of the incident beam, which probe the shape of the observed
spectrum and can sensitively signal neutrino oscillations. They provide methods
to extract the neutrino mixing angle and mass splitting from the data and also
to distinguish oscillation to sequential neutrinos from those to a sterile
neutrino.


title:
Reduction of Feynman graph amplitudes to a minimal set of basic
  integrals

abstract:
  An algorithm for the reduction of massive Feynman integrals with any number
of loops and external momenta to a minimal set of basic integrals is proposed.
The method is based on the new algorithm for evaluating tensor integrals,
representation of generalized recurrence relations for a given kind of
integrals as a linear system of PDEs and the reduction of this system to a
standard form using algorithms proposed by G. Reid. Basic integrals reveal as
parametric derivatives of the system in the standard form and the number of
basic integrals in the minimal set is determined by the dimension of the
solution space of the system of PDEs.


title:
Power Corrections to Fragmentation Functions in Flavour-Singlet Deep
  Inelastic Scattering

abstract:
  We investigate the power-suppressed corrections to fragmentation functions in
flavour-singlet deep inelastic lepton scattering, to complement the previous
results for the non-singlet contribution. Our method is a dispersive approach
based on an analysis of Feynman graphs containing massive gluons. As in
non-singlet deep inelastic scattering we find that the leading corrections are
proportional to 1/Q^2.


title: Perturbative QCD theory (includes our knowledge of alpha_s)

abstract:
  Following the logic of the great Chinese warrior-philosopher Master Sun Tzu,
  "The rules of the military are five: measurement, assessment, calculation,
comparison and victory", we address the problem of what we know, think we know,
and think about the QCD coupling.


title: $b\to s s \bar d$ Decay in Two Higgs Doublet Models

abstract:
  In the Standard Model, the box-diagram mediated decay $b\to s s \bar d$ is
predicted to occur with an extremely small branching ratio of below $10^{-11}$,
thus providing a safe testing ground for exposing new physics. We study this
process in several Two Higgs Doublet Models and explore their parameter space,
indicating where this process becomes observable.


title: Mean field theory for collective motion of quantum meson fields

abstract:
  Mean field theory for the time evolution of quantum meson fields is studied
in terms of the functional Schroedinger picture with a time-dependent Gaussian
variational wave functional. We first show that the equations of motion for the
variational wavefunctional can be rewritten in a compact form similar to the
Hartree-Bogoliubov equations in quantum many-body theory and this result is
used to recover the covariance of the theory. We then apply this method to the
O(N) model and present analytic solutions of the mean field evolution equations
for an N-component scalar field. These solutions correspond to quantum
rotations in isospin space and represent generalizations of the classical
solutions obtained earlier by Anselm and Ryskin. As compared to classical
solutions new effects arise because of the coupling between the average value
of the field and its quantum fluctuations. We show how to generalize these
solutions to the case of mean field dynamics at finite temperature. The
relevance of these solutions for the observation of a coherent collective state
or a disoriented chiral condensate in ultra-relativistic nuclear collisions is
discussed.


title: The intercept of the BFKL pomeron from Forward Jets at HERA

abstract:
  Recently the H1 and ZEUS collaborations have presented cross sections for DIS
events with a forward jet. The BFKL formalism is able to produce an excellent
fit to these data. The extracted intercept of the hard pomeron suggests that
when all higher order corrections are taken into account the cross section will
still rise very rapidly as expected for low $x$ dynamics.


title: Heavy Majorana Neutrinos and Baryogenesis

abstract:
  The scenario of baryogenesis through leptogenesis is reviewed in models
involving heavy Majorana neutrinos. The various mechanisms of CP violation
occurring in the out-of-equilibrium lepton-number-violating decays of heavy
Majorana neutrinos are studied within a resummation approach to
unstable-particle mixing. It is explicitly demonstrated how the resummation
approach preserves crucial field-theoretic properties such as unitarity and CPT
invariance. Predictions of representative scenarios are presented after solving
numerically the Boltzmann equations describing the thermodynamic evolution of
the Universe. The phenomenological consequences of loop effects of heavy
Majorana neutrinos on low-energy observables, such as lepton-flavour and/or
lepton-number non-conservation in $\tau$ and $Z$-boson decays and electron
electric dipole moment, are discussed.


title: Gluon mini-jet production in nuclear collisions at high energies

abstract:
  We show explicitly that the leading soft gluon $p_T$ distribution, predicted
by Kovner, McLerran, and Weigert after solving classical Yang-Mills equations,
can be understood in terms of conventional QCD perturbation theory. We also
demonstrate that the key logarithm in their result represents the logarithm in
DGLAP evolution equations.


title:
Determination of Radiative Widths of Scalar Mesons from Experimental
  Results on $\gamma\gamma\to\pi\pi$

abstract:
  The scalar mesons in the 1 GeV region constitute the Higgs sector of the
strong interactions. They are responsible for the masses of all light flavour
hadrons. However, the composition of these scalar states is far from clear,
despite decades of experimental effort. The two photon couplings of the
$f_{0}$'s are a guide to their structure. Two photon results from Mark II,
Crystal Ball and CELLO prompt a new Amplitude Analysis of
$\gamma\gamma\to\pi^+\pi^-$, $\pi^0\pi^0$ cross-sections. Despite their
currently limited angular coverage and lack of polarized photons, we use a
methodology that provides the nearest one can presently achieve to a
model-independent partial wave separation. We find two distinct classes of
solutions. Both have very similar two photon couplings for the $f_0(980)$ and
$f_0(400-1200)$. Hopefully these definitive results will be a spur to dynamical
calculations that will bring us a better understanding of these important
states.


title: Flavour Dynamics with General Scalar Fields

abstract:
  We consider a spontaneously broken gauge theory based on the standard model
(SM) group G = SU(2) x U(1) with scalar fields that carry arbitrary
representations of G, and we investigate some general properties of the charged
and neutral current involving these fields. In particular we derive the
conditions for having real or complex couplings of the Z boson to two different
neutral or charged scalar fields, and for the existence of CP-violating
Z-scalar-scalar couplings. Moreover, we study models with the same fermion
content as in the SM, with one SU(2) Higgs singlet, and an arbitrary number of
Higgs doublets. We show that the structure of the Z-Higgs boson and of the
Yukawa couplings in these models can be such that CP-violating Zb{\bar b}G form
factors which conserve chirality are induced at the one-loop level.


title: Strongly Interacting Neutrinos and the Highest Energy Cosmic Rays

abstract:
  Cosmic rays of energies larger than the Greisen-Zatsepin-Kuzmin (GZK) cutoff
may be neutrinos if they acquire strong interactions due to a ``precocious
unification'' of forces. A scenario for this to happen is outlined. There is no
contradiction with precision measurements carried out at LEP and SLAC.
Observable consequences at LHC and future neutrino detectors are discussed.


title: Spectral Content of Isoscalar Nucleon Form Factors

abstract:
  The nucleon strange vector and isoscalar electromagnetic form factors are
studied using a spectral decomposition. The K\bar{K} contribution to the
electric and magnetic radii as well as the magnetic moment is evaluated to all
orders in the strong interaction using an analytic continuation of experimental
KN scattering amplitudes and bounds from unitarity. The relationship between
non-resonant and resonant K\bar{K} contributions to the form factors is
demonstrated, and values for the vector and tensor \phi N\bar{N} couplings are
derived. The K\bar{K} spectral functions are used to evaluate the credibility
of model calculations for the strange quark vector current form factors.


title: Quark Masses and Flat Directions in String Models

abstract:
  I discuss a method for producing a quasi-realistic inter-generational quark
mass hierarchy in string models. This approach involves non-Abelian singlet
states developing intermediate scale vacuum expectation values. I summarize
recent investigations into string model realization of this. Talk presented at
QCD98, Paris, France, 1-6 June 1998.


title:
QCD Corrections to Scalar Production via Heavy Quark Fusion at Hadron
  Colliders

abstract:
  We recently proposed that, due to the top-quark-mass enhanced Yukawa
coupling, the s-channel production of a charged scalar or pseudo-scalar from
heavy quark fusion can be an important new mechanism for discovering
non-standard spin-0 particles. In this work, we present the complete O(alpha_s)
QCD corrections to this s-channel production process at hadron colliders,
including the results of QCD resummation over multiple soft-gluon emission. The
systematic QCD-improved production and decay rates at the FermiLab Tevatron and
the CERN LHC are given for the charged top-pions in the topcolor models and for
the charged Higgs bosons in the generic two Higgs doublet model. The direct
extension to the production of the neutral (pseudo-)scalars via bb\bar fusion
is studied in the minimal supersymmetric standard model (MSSM) with large
tan(beta), and in the topcolor model with large bottom Yukawa coupling.


title: Pion Exchange and the H1 Forward Spectrometer Data

abstract:
  We point out that the $\Delta\pi$ component of the nucleon wave function is
vital to the interpretation of the recent H1 data for leading baryon
production. While the $n/p$ ratio is equal to two with the $N\pi$ component
alone, the inclusion of the $\Delta\pi$ component brings this ratio very near
to unity, as observed in the experiment. This result demonstrates that pion
exchange can not only account for leading neutron but also for a large fraction
of the leading proton production.


title: Chiral Symmetry and the Nucleon Spin Structure Functions

abstract:
  We carry out a systematic investigation of twist-two spin dependent structure
functions of the nucleon within the framework of the chiral quark soliton model
(CQSM) by paying special attention to the role of chiral symmetry of QCD. We
observe a substantial difference between the predictions of the longitudinally
polarized distribution functions and the transversity distribution ones. That
the chiral symmetry is responsible for this difference can most clearly be seen
in the isospin dependence of the corresponding first moments, i.e. the axial
and tensor charges. The CQSM predicts $g_A^{(0)} / g_A^{(3)} \simeq 0.25$ for
the ratio of the isoscalar to isovector axial charges, and $g_T^{(0)} /
g_T^{(3)} \simeq 0.46$ for the ratio of the isoscalar to isovector tensor
charges, which should be compared with the prediction of the naive (non-chiral)
MIT bag model, $g_A^{(0)} / g_A^{(3)} = g_T^{(0)} / g_T^{(3)} = 3 / 5$.


title:
Do the E866 Drell Yan data change our picture of the chiral structure of
  the nucleon ?

abstract:
  We revisit the evaluation of the pionic mechanism of the
$\bar{u}-\bar{d}$-asymmetry in the proton structure function. Our analysis is
based on the extended AGK unitarity relation between contributions of different
mechanisms to the inclusive particle production and the total photoabsorption
cross-section (i.e. the proton structure function). We reanalyze the role of
isovector reggeons in inclusive production of nucleons and Delta isobars in
hadronic reactions. We find rather large contribution of reggeon-exchange
induced production of Delta isobars. This leaves much less room for the
pion-exchange induced mechanism of $\Delta$ production and provides a
constraint on the $\pi N \Delta$ form factor. The production of leading pions
in proton-proton collisions at ISR puts additional constraints on the $\pi NN$
vertex form factors. An extension of the AGK-rules to reggeon exchange suggests
a negligible contribution to the proton structure function from DIS off the
exchanged $\rho,a_2$ reggeons. All these constraints are used then to estimate
the pion content of the nucleon and allow to calculate parameter-free the
$x$-dependence of $\bar d - \bar u$. We discuss the violation of the Gottfried
Sum Rule and $\bar d$-$\bar u$ asymmetry and compare to the one obtained from
the E866 experiment at Fermilab. We estimate the background to the pion
structure function being determined by the ZEUS and H1 collaborations at HERA
from leading neutron experiments.


title:
A Theoretical Reappraisal of Branching Ratios and CP Asymmetries in the
  Decays $B \to (X_d,X_s) \ell^+ \ell^-$ and Determination of the CKM
  Parameters

abstract:
  We present a theoretical reappraisal of the branching ratios and CP
asymmetries for the decays $ B \to X_q \ell^+ \ell^-$, with $q=d,s$, taking
into account current theoretical uncertainties in the description of the
inclusive decay amplitudes from the long-distance contributions, an improved
treatment of the renormalization scale dependence, and other parametric
dependencies. Concentrating on the partial branching ratios $\Delta {\cal B}(B
\to X_q \ell^+ \ell^-)$, integrated over the invariant dilepton mass region $1
{GeV}^2 \leq s \leq 6 {GeV}^2$, we calculate theoretical precision on the
charge-conjugate averaged partial branching ratios $<\Delta{\cal B}_q >=
(\Delta {\cal B}(B \to X_q \ell^+ \ell^-) + \Delta {\cal B}(\bar{B} \to
\bar{X}_q \ell^+ \ell^-))/2$, CP asymmetries in partial decay rates
$(a_{CP})_q=(\Delta {\cal B}(B \to X_q \ell^+ \ell^-) - \Delta {\cal B}(\bar{B}
\to \bar{X}_q \ell^+ \ell^-))/(2 < \Delta{\cal B}_q >)$, and the ratio of the
branching ratios $\Delta {\cal R} = < \Delta{\cal B}_d >/< \Delta{\cal B}_s>$.
For the central values of the CKM parameters, we find $<\Delta {\cal B}_s >
=(2.22^{+0.29}_{-0.30}) \times 10^{-6}$, $<\Delta {\cal B}_d >
=(9.61^{+1.32}_{-1.47}) \times 10^{-8}$, $(a_{CP})_s
=-(0.19^{+0.17}_{-0.19})%$, $(a_{CP})_d =(4.40^{+3.87}_{-4.46})%$, and $\Delta
{\cal R} =(4.32 \pm 0.03)%$. The dependence of $<\Delta{\cal B}_d>$ and $\Delta
{\cal R}$ on the CKM parameters is worked out and the resulting constraints on
the unitarity triangle from an eventual measurement of $\Delta {\cal R}$ are
illustrated.


title: Photogravitational processes

abstract:
  In the linearized theory of gravity coupled to the electromagnetic field, we
calculate the cross sections of two processes in which both the gravitational
and electromagnetic interactions play a role. Those processes, in which a
graviton is produced in the final state, are: (a) the photoproduction of
gravitons off electrons and (b) the production of a photon and a graviton from
electron-positron annihilation. The motivation and outlook for these
calculations are discussed.


title: Mixing and Decay Constants of Pseudoscalar Mesons: The Sequel

abstract:
  We present further tests and applications of the new eta-eta' mixing scheme
recently proposed by us. The particle states are decomposed into orthonormal
basis vectors in a light-cone Fock representation. Because of flavor symmetry
breaking the mixing of the decay constants can be identical to the mixing of
particle states at most for a specific choice of this basis. Theoretical and
phenomenological considerations show that the quark flavor basis has this
property and allows, therefore, for a reduction of the number of mixing
parameters. A detailed comparison with other mixing schemes is also presented.


title: Heavy Quark Production

abstract:
  We provide a brief overview of some current experimental and theoretical
issues of heavy quark production.


title:
Asymptotic high energy behavior of the deeply virtual Compton scattering
  amplitude

abstract:
  We compute the deeply virtual Compton scattering (DVCS) amplitude for forward
and backward scattering in the asymptotic limit. Since this calculation does
not assume ordering of the transverse momenta, it includes important
logarithmic contributions that are beyond those summed by the DGLAP evolution.
These contributions lead to a power-like behavior for the forward DVCS
amplitude.


title: Exclusive B -> pi e^+ e^- and B -> rho e^+ e^-

abstract:
  We investigate the exclusive B -> pi e^+ e^- and B -> rho e^+ e^- decays in
framework of the general two Higgs doublet model (model III), in which an extra
phase angle in the charged--Higgs fermion coupling, i.e., a new source for CP
violation exists. The CP violation for both decays are calculated and it is
observed that the CP violating asymmetry in model III differs significantly
than the one predicted by the standard model and model II which is a special
case of model III. Furthermore, it is shown that the zero value of forward
backward asymmetry A_{FB} is shifted when compared with the SM value, which can
also serve as the efficiency tool for establishing new physics.


title:
Global Three-Neutrino Vacuum Oscillation fits to the Solar and
  Atmospheric Anomalies

abstract:
  We determine the three-neutrino mixing and mass parameters that are allowed
by the solar and atmospheric neutrino data when vacuum oscillations are
responsible for both phenomena. The global fit does not appreciably change the
allowed regions for the parameters obtained from effective two-neutrino fits.
We discuss how measurements of the solar electron energy spectrum below 6.5 GeV
in Super-Kamiokande and seasonal variations in the Super-Kamiokande, $^{71}$Ga,
and BOREXINO experiments can distinguish the different solar vacuum solutions.


title: Cabibbo-suppressed non-leptonic B- and D-decays involving tensor mesons

abstract:
  The Cabibbo-suppressed non-leptonic decays of B (and D) mesons to final
states involving tensor mesons are computed using the non-relativistic quark
model of Isgur-Scora-Grinstein-Wise with the factorization hypothesis. We find
that some of these B decay modes, as B --> (K^*, D^*)D^*_2, can have branching
ratios as large as 6 x 10^{-5} which seems to be at the reach of future B
factories.


title: Exploiting $h \to W^*W^*$ Decays at the Upgraded Fermilab Tevatron

abstract:
  We study the observability of a Standard Model-like Higgs boson at an
upgraded Fermilab Tevatron via the mode $h \to W^*W^*$. We concentrate on the
main channel $gg \to h \to W^*W^* \to l \nu l \nu$. We also find the mode
$q\bar q'\to W h \to W W^*W^* \to l^\pm \nu l^\pm \nu jj$ useful. We perform
detector level simulations by making use of a Monte Carlo program SHW.
Optimized searching strategy and kinematical cuts are developed. We find that
with a c.m. energy of 2 TeV and an integrated luminosity of 30 fb$^{-1}$ the
signal should be observable at a 3$\sigma$ level or better for the mass range
of 145 GeV < m_h < 180 GeV. For 95% confidence level exclusion, the mass reach
is 135 GeV < m_h <190 GeV. We also present results of studying these channels
with a model-independent parameterization. Further improvement is possible by
including other channels. We conclude that the upgraded Fermilab Tevatron will
have the potential to significantly advance our knowledge of Higgs boson
physics.


title: Scale of SU(2)_R symmetry breaking and leptogenesis

abstract:
  Models of leptogenesis often invoke the out-of-equilibrium decays of heavy
right-handed neutrinos in order to create a baryon asymmetry of the universe
through the electroweak phase transition. Their presumed existence argues
strongly for the presence of an $SU(2)_R$ gauge symmetry. We study the
equilibrating effects of the resulting additional right-handed interactions and
find that successful leptogenesis requires that $m_N \gtrsim 10^{16}$ GeV if
$m_N > m_{W_R}$, and $m_{W_R} \gtrsim 3 \times 10^6 GeV (m_N /10^2 GeV)^{2/3}$
if $m_{N}<m_{W_R}$, where $m_{N}$ is the mass of the lightest right-handed
neutrino. However, the $m_N > m_{W_R}$ option is excluded in a supersymmetric
theory with gravitinos.


title: Semi-Exclusive Processes: New Probes of Hadron Structure

abstract:
  We define and study hard ``semi-exclusive'' processes of the form $A+B \to C
+ Y$ which are characterized by a large momentum transfer between the particles
$A$ and $C$ and a large rapidity gap between the final state particle $C$ and
the inclusive system $Y$. Such reactions are in effect generalizations of deep
inelastic lepton scattering, providing novel currents which probe specific
quark distributions of the target $B$ at fixed momentum fraction. We give
explicit expressions for photo- and leptoproduction cross sections such as
$\gamma p \to \pi Y$ in terms of parton distributions in the proton and the
pion distribution amplitude. Semi-exclusive processes provide opportunities to
study fundamental issues in QCD, including odderon exchange and color
transparency, and suggest new ways to measure spin-dependent parton
distributions.


title: Determining the Weak Phase $\gamma$ in the Presence of Rescattering

abstract:
  We suggest a new technique to determine the CKM phase $\gamma$ {\em without}
neglecting the (soft) final state rescattering effects. We use (time
integrated) $B$ meson decay rates to $\pi$'s and $K$'s. A set of 5 $\Delta S =
0$ (or 1 $\Delta S =0$ and 4 $\Delta S= 1$) decay rates is used to compute the
strong phases and magnitudes of the tree level and penguin contributions as
functions of $\gamma$. These are used to {\em predict} a $\Delta S = 1$
$(\Delta S = 0) B_{d/s}$ decay rate as a function of $\gamma$ (using SU(3)
symmetry). The measurement of this decay rate then gives $\gamma$. We
illustrate this technique using different cases. Most of the decay modes we use
are expected to be accessible at the B-factories (e^+ e^- or hadron machines).


title: Hadronic B Meson Decays - getting ready for CP violation

abstract:
  We review recent results on hadronic B meson decays including rare as well as
non-suppressed decays. The main emphasis is on those channels relevant to
measurement of CP violation in the coming B factories. After briefly describing
flavor-tagged charm counting, we cover B -> DK(*), B -> charmless 2-body
decays, inclusive eta' production, and final-state-interaction phases in B ->
Psi K* and B -> D* rho.


title:
Infrared-finite factorization and renormalization scheme for exclusive
  processes. Application to pion form factors

abstract:
  We develop and discuss an infrared-finite factorization and optimized
renormalization scheme for calculating exclusive processes which enables the
inclusion of transverse degrees of freedom without entailing suppression of
calculated observables, like form factors. This is achieved by employing an
analytic, i.e., infrared stable, effective coupling $\alpha_{s}(Q^{2})$ which
removes the Landau singularity at $Q^{2}=\Lambda_{\rm QCD}^{2}$ by a
power-behaved correction. The ensuing contributions to the cusp anomalous
dimension, related to the Sudakov form factor, and to the quark anomalous
dimension, which controls evolution, lead to enhancement of the hard part of
exclusive amplitudes, calculated in perturbative QCD. The phenomenological
implications of this framework are analyzed by applying it to the pion's
electromagnetic form factor and the pion-photon transition.


title: QED Structure Functions of the Photon

abstract:
  In deep inelastic electron-photon scattering in leading order QED,
egamma->egamma*gamma->effbar, there are four non-zero structure functions. We
calculate them for real photons retaining the full dependence on the fermion
mass, and show numerical results of its effect.


title: Zee Mass Matrix and Bi-Maximal Neutrino Mixing

abstract:
  We investigate neutrino masses and mixings within the framework of the Zee
mass matrix, with three lepton flavors. It is shown that the bi-maximal
solution is the only possibility to reconcile atmospheric and solar neutrino
data, within this ansatz. We obtain two almost degenerate neutrinos, which are
mixtures of all three neutrino flavors, with heavy masses $\simeq \sqrt{\Delta
m_{atm}^2}$. The predicted mass of the lightest neutrino, which should consist
mostly of $\nu_{\mu}$ and $\nu_{\tau}$, is $\simeq \Delta
m_{\odot}^2/(2\sqrt{\Delta m_{atm}^2})$.


title: M-theory dark matter

abstract:
  The phenomenological implications of the eleven dimensional limit of
$M$-theory (strongly coupled $E_8\times E_8$) are investigated. In particular
we calculate the supersymmetric particle spectrum subject to constraints of
correct electroweak symmetry breaking and the requirement that the lightest
supersymmetric particle provides the dark matter of the universe. We also
calculate direct detection event rates of the lightest neutralino relevant for
non-baryonic dark matter experiments. The modulation effect, due to Earth's
annual motion is also calculated.


title: Electron Neutrino Sources from the Core of the Earth

abstract:
  The physical interpretation of extensive measurements of electron neutrinos
(in laboratories located on or somewhat below the Earth's surface) often
require geophysical notions concerning the possible neutrino sources. Here, we
discuss the notion that the Earth's core is a substantial source of low energy
electron neutrinos.


title: The Standard Model of Particle Physics

abstract:
  Particle physics has evolved a coherent model that characterizes forces and
particles at the most elementary level. This Standard Model, built from many
theoretical and experimental studies, is in excellent accord with almost all
current data. However, there are many hints that it is but an approximation to
a yet more fundamental theory. We trace the development of the Standard Model
and indicate the reasons for believing that it is incomplete.


title:
The large-scale modulation of the density distribution in standard
  axionic CDM and its cosmological and physical impact

abstract:
  It is shown, that the energy density of coherent axion field oscillations in
the cosmology of standard invisible axion should be distributed in the Universe
in the form of archioles, being nonlinear inhomogeneous structure, reflecting
the large scale distribution of Brownian structure of axion strings in the very
early Universe. Spectrum of inhomogeneities, generated by archioles, is
obtained and their effects in the spectrum and quadrupole anisotropy of relic
radiation are considered. The axionic-string-decay-model-independent
restriction on the scale of axion interaction is obtained.


title:
Superconductivity by long-range color magnetic interaction in
  high-density quark matter

abstract:
  We argue that in quark matter at high densities, the color magnetic field
remains unscreened and leads to the phenomenon of color superconductivity.
Using the renormalization group near the Fermi surface, we find that the
long-range nature of the magnetic interaction changes the asymptotic behavior
of the gap $\Delta$ at large chemical potential $\mu$ qualitatively. We find
$\Delta\sim\mu g^{-5}\exp(-{3\pi^2\over\sqrt{2}}{1\over g})$, where $g$ is the
small gauge coupling. We discuss the possibility of breaking rotational
symmetry by the formation of a condensate with nonzero angular momentum, as
well as interesting parallels to some condensed matter systems with long-range
forces.


title: Lattice QCD Calculations of Leptonic and Semileptonic Decays

abstract:
  In lattice QCD, obtaining properties of heavy-light mesons has been easier
said than done. Focusing on the $B$ meson's decay constant, it is argued that
towards the end of 1997 the last obstacles were removed, at least in the
quenched approximation. These developments, which resulted from a fuller
understanding and implementation of ideas in effective field theory, bode well
for current studies of neutral meson mixing and of semileptonic decays.


title: Instant Preheating

abstract:
  We describe a new efficient mechanism of reheating. Immediately after rolling
down the rapidly moving inflaton field $\phi$ produces particles $\chi$, which
may be either bosons or fermions. This is a nonperturbative process which
occurs almost instantly; no oscillations or parametric resonance is required.
The effective masses of the $\chi$ particles may be very small at the moment
when they are produced, but they ``fatten'' when the field $\phi$ increases.
When the particles $\chi$ become sufficiently heavy, they rapidly decay to
other, lighter particles. This leads to an almost instantaneous reheating
accompanied by the production of particles with masses which may be as large as
$10^{17}-10^{18}$ GeV. This mechanism works in the usual inflationary models
where $V(\phi)$ has a minimum, where it takes only a half of a single
oscillation of the inflaton field $\phi$, but it is especially efficient in
models with effective potentials slowly decreasing at large $\phi$ as in the
theory of quintessence.


title: Improved Single Sector Supersymmetry Breaking

abstract:
  Building on recent work by N. Arkani-Hamed and the present authors, we
construct realistic models that break supersymmetry dynamically and give rise
to composite quarks and leptons, all in a single strongly-coupled sector. The
most important improvement compared to earlier models is that the
second-generation composite states correspond to dimension-2 "meson" operators
in the ultraviolet. This leads to a higher scale for flavor physics, and gives
a completely natural suppression of flavor-changing neutral currents. We also
construct models in which the hierarchy of Yukawa couplings is explained by the
dimensionality of composite states. These models provide an interesting and
viable alternative to gravity- and gauge-mediated models. The generic
signatures are unification of scalar masses with different quantum numbers at
the compositeness scale, and lighter gaugino, Higgsino, and third-generation
squark and slepton masses. We also analyze large classes of models that give
rise to both compositeness and supersymmetry breaking, based on gauge theories
with confining, fixed-point, or free-magnetic dynamics.


title: Scaling Exponent and Fluctuation Strength in High Energy Collisions

abstract:
  The information on dynamical fluctuations that can be extracted from the
anomalous scaling observed recently in hadron-hadron collision experiments is
discussed in some detail. A parameter ``effective fluctuation strength'' is
proposed to estimate the strength of dynamical fluctuations. The method for
extracting its value from the experimentally observed quantities is given. Some
examples for the application of this method to real experimental data are
presented.


title:
Homogeneous nucleation of quark-gluon plasma, finite size effects and
  long-lived metastable objects

abstract:
  The general formalism of homogeneous nucleation theory is applied to study
the hadronization pattern of the ultra-relativistic quark-gluon plasma (QGP)
undergoing a first order phase transition. A coalescence model is proposed to
describe the evolution dynamics of hadronic clusters produced in the nucleation
process. The size distribution of the nucleated clusters is important for the
description of the plasma conversion. The model is most sensitive to the
initial conditions of the QGP thermalization, time evolution of the energy
density, and the interfacial energy of the plasma-hadronic matter interface.
The rapidly expanding QGP is first supercooled by about $\Delta T = T - T_c =
4-6 %$. Then it reheats again up to the critical temperature T_c. Finally it
breaks up into hadronic clusters and small droplets of plasma. This fast
dynamics occurs within the first $5-10 fm/c$. The finite size effects and
fluctuations near the critical temperature are studied. It is shown that a drop
of longitudinally expanding QGP of the transverse radius below 4.5 fm can
display a long-lived metastability. However, both in the rapid and in the
delayed hadronization scenario, the bulk pion yield is emitted by sources as
large as 3-4.5 fm. This may be detected experimentally both by a HBT
interferometry signal and by the analysis of the rapidity distributions of
particles in narrow p_T-intervals at small p_T on an event-by-event basis.


title:
A method for research on behaviour of a dimesoatomic wave function at
  small distances

abstract:
  The Schr\"odinger equation discribing the local potential model of a strong
$\pi^+\pi^-$-interaction was studied. The influence of the strong
$\pi^+\pi^-$-interaction of the behaviour of pionium nS-state wave functions at
small distances is studied both analytically (perturbatively) and numerically.
It is shown that in the whole the accounting of strong interaction results in
multiplying pure Coulomb pionium wave functions by some function is practically
independent of the value of the principal quantum number n. Due to this reason,
the n-independence of probability of $\pi^+\pi^-$-atom production in nS-state
remains the same as in the case of a pure Coulomb $\pi^+\pi^-$-interaction.


title: Loop Calculations and OZI Rule

abstract:
  The role of two step mechanisms in the OZI rule violation in NNbar
annihilation at low energies is reviewed. The full calculation of two-meson
doorway mechanisms shows that the off-mass-shell contributions are important.
Moreover, for the (phi pi0) and (phi rho) annihilation channels three-meson
doorway contributions are non-negligible and improve agreement with the data. A
significant enhancement of phi production is found in the resonant rescattering
mechanisms p pbar -> pi+ pi- K Kbar -> pi+ pi- phi and p pbar -> eta K Kbar ->
eta phi.


title:
A simple model for transverse energy distribution in heavy ion
  collisions

abstract:
  A simple geometrical model (often quoted in literature as the Glauber model)
of heavy ion collisions is recapitulated. It is shown that the transverse
energy distribution of heavy ion collisions follow the geometry of the
collision. An extension of the model to include rapidity and transverse mass
particle spectra is discussed.


title: Hierarchy problem in the shell-Universe model

abstract:
  In the model where the Universe is considered as a thin shell expanding in
5-dimensional hyper-space there is a possibility to obtain one scale for
particle theory corresponding to the 5-dimensional cosmological constant and
Universe thickness.


title: Spin dependent structure function $g_1$ at small $x$ and small $Q^2$

abstract:
  Theoretical expectations concerning the low $x$ and low $Q^2$ behaviour of
$g_1$ are summarized and compared with the recent SMC data.


title: Top Dipole Form Factors and Loop-induced CP-violation in Supersymmetry

abstract:
  The one-loop Minimal Supersymmetric Standard Model (MSSM) contributions to
the weak and electromagnetic dipole form factors of the top quark are
presented. Far from the Z peak, they are not sufficient to account for all the
new physics effects. In the context of the calculation of the process e^+e^- ->
t tbar to one loop in the MSSM, we compare the impact on the phenomenology of
the CP-violating dipole form factors of the top quark with the contribution
from CP-violating box graphs. Some exemplificative observables are analyzed and
the relevance of both the contributions is pointed out. The one-loop
expressions for the electromagnetic and weak dipole form factors in a general
renormalizable theory and the SM and MSSM couplings and conventions are also
given.


title: Perspectives on Heavy Quark 98

abstract:
  I summarize and comment upon some highlights of HQ98, the Workshop on Heavy
Quarks (strange, charm, and beauty) at Fixed Target.


title: The Standard Model and Beyond

abstract:
  We start with a brief presentation of the Standard Model and the weak neutral
current, in view of a discussion of parity-violation in electron-hadron
electroweak interactions. We then discuss some limitations of this model,
motivating the consideration of larger frameworks such as grand-unification and
supersymmetry. We also comment about the possible effects of additional light
neutral gauge bosons.


title: Inelastic Sum Rules

abstract:
  The history and present status of several sum rules for deep-inelastic lepton
scattering are reviewed, with particular attention to the discovery of scaling,
partons, quarks and QCD. Two outstanding issues are then discussed in more
detail: the singlet (Ellis-Jaffe) nucleon spin sum rule and the
Drell-Hearn-Gerasimov-Iddings sum rule.


title:
Charged right-handed currents in the leptoquark-bilepton flavordynamics
  chiral models

abstract:
  Flavordynamics chiral models of leptoquark fermions and bilepton gauge bosons
with masses up to about 1 TeV, although coincident at low energy with the
standard model, address the question of fermion mass hyerarchy and explain the
flavor question. The presence of charged right-handed weak currents coupled to
bileptons, which we point out herein, is another remarkable feature of these
chiral theories.


title:
Charge quantization in the largest leptoquark-bilepton chiral
  electroweak scheme

abstract:
  The uniqueness of the hypercharge assignments in the three fermion families
leptoquark-bilepton $SU(3)_C \times SU(4)_L \times U(1)_N$ model is
established. Although the gauge group contains an explicit U(1) factor, freedom
from triangle anomalies combined with the requirement of nonvanishing charged
fermion masses uniquely fix the electric charges of all fermions independently
of the neutrinos being massless or not. The electric-charge quantization,
family replication, and the existence of three colors are interwoven.


title: BFKL at next-to-leading order

abstract:
  This is a summary of the contributions on the next-to-leading order
corrections to the BFKL equation which were presented to the `Small-x and
Diffraction' working group at the 1998 Durham Workshop on HERA Physics.


title: Cooper pairing at large N in a 2-dimensional model

abstract:
  We study a 2-dimensional model of Fermi fields that is closely related to the
Gross-Neveu model, and show that to leading order in 1/N a <psi-psi> condensate
forms. This effect is independent of the chemical potential, a peculiarity that
we expect to be specific to 2 dimensions. We also expect the condensate to be
unstable against corrections at higher orders in 1/N. We compute the Green's
functions associated with the composite psi-psi, and show that the Fermion
acquires a Majorana mass proportional to the gap, and that a massless Goldstone
pole appears.


title: Scalar resonances in leptophilic multi-Higgs models

abstract:
  We show that the Higgs resonance can be amplified in a 3-3-1 model with a
multi-Higgs "leptophilic" scalar sector. This would allow the observation of
the Higgs particle in muon colliders even for Higgs masses considerably higher
than the ones expected to be seen in the electroweak standard model framework.


title: Establishing a nu_{mu,tau} Component in the Solar Neutrino Flux

abstract:
  We point out that the recoil electron kinetic energy spectra in the nu-e
elastic scattering are different for incident nu_{e} or nu_{mu,tau}, and hence
one can in principle establish the existence of the nu_{mu,tau} component in
the solar neutrino flux by fitting the shape of the spectrum. This would be a
new model-independent test of the solar neutrino oscillation in a single
experiment, free from astrophysical and nuclear physics uncertainties. For the
^7Be neutrinos, it is possible to determine the nu_{mu,tau} component at
BOREXINO or KamLAND, if the background is sufficiently low. Note that this
effect is different from the distortion in the incident neutrino energy
spectrum, which has been discussed in the literature.


title: Leading Order Textures for Lepton Mass Matrices

abstract:
  In theories with three light neutrinos, certain simplicity assumptions allow
the construction of a complete list of leading order lepton mass matrices.
These matrices are consistent with m_{tau} \neq 0, Delta m^2_{12} \ll Delta
m^2_{23}, theta_{23} approx 1, and theta_{13} = 0, as suggested by measurements
of atmospheric and solar neutrino fluxes. The list contains twelve generic
cases: two have three degenerate neutrinos, eight have two neutrinos forming a
Dirac state, and in only two cases is one neutrino much heavier than the other
two. For each of these twelve generic cases the possible forms for the
perturbations which yield m_{mu} are given. Ten special textures are also
found.


title:
On a Qualitative Difference between the Dynamics of Particle Production
  in Soft and Hard Processes of High Energy Collisions

abstract:
  The qualitative difference between the anomalous scaling properties of
hadronic final states in soft and hard processes of high energy collisions is
studied in some detail. It is pointed out that the experimental data of e^+e^-
collisions at $E_{cm}=$91.2 GeV from DELPHI indicate that the dynamical
fluctuations in e^+e^- collisions are isotropical, in contrast to the
anisotropical fluctuations oberserved in hadron-hadron collision experiments.
This assertion is confirmed by the Monte Carlo simulation using the Jetset7.4
event generator.


title: Levy Stability Index from Multifractal Spectrum

abstract:
  A method for extracting the Levy stability index $\mu$ from the multi-fractal
spectrum $f(\alpha)$ in high energy multiparticle production is proposed. This
index is an important parameter, characterizing the non-linear behaviour of
dynamical fluctuations in high energy collisions. Using the random cascading
$\alpha$ model as example, the validity of this method is tested. It is shown
that this method, basing on a linear fit, is consistent with and more accurate
than the usual method of fitting the ratio of $q$th to 2nd order multi-fractal
(R\'enyi) dimensions to the Peschanski formula.


title: Factorization and high-energy effective action

abstract:
  I demonstrate that the amplitude for high-energy scattering can be factorized
as a convolution of the contributions due to fast and slow fields. The fast and
slow fields interact by means of Wilson-line operators -- infinite gauge
factors ordered along the straight line. The resulting factorization formula
gives a starting point for a new approach to the effective action for
high-energy scattering in QCD.


title: Chiral Symmetry and Quark Confinement

abstract:
  In the physical vacuum of QCD, the energy density of light-quark fields
strongly coupled to slowly varying gluon fields can be negative, and so a
condensate of pairs of quarks and antiquarks of nearly opposite momenta forms
which breaks chiral symmetry, confines quarks, and makes gluons massive.


title:
The penguin operators in nonresonant $B^- \to M \bar M \pi^-$ $(M
  =\pi^-, K^-, K^0)$ decays

abstract:
  We investigate the contributions coming from the penguin operators in the
nonresonant $B^- \to M \bar M \pi^-$ ($M =\pi^-, K^-, K^0$) decays. The
effective Wilson coefficients of the the strong penguin operators $O_{4,6}$ are
found to be relatively larger. We calculate the contributions arising from the
$O_4$ and $O_6$ operators in the nonresonant decays $B^- \to M \bar M\pi^-$ ($M
= \pi^-, K^-, \bar K^0$) using a model combining heavy quark symmetry and the
chiral symmetry, developed previously. We find that the forbidden nonresonant
$B^- \to K^0 \bar K^0 \pi^-$ decay occurs through the strong penguin operators.
These penguin contributions affect the branching ratios for $B^- \to M \bar
M\pi^-$ ($M = \pi^-, K^-$) by only a few percent. The branching ratio for $B^-
\to K^0 \bar K^0 \pi^-$ is estimated to be of the order $ 10^{-6}$.


title:
Lepton-Flavour Violation in Ordinary and Supersymmetric Grand Unified
  Theories

abstract:
  By an explicit calculation we show that in ordinary SU(5) logarithmic
divergence in the amplitude of $\mu \to e\gamma$ cancels among diagrams and
remaining finite part is suppressed by at least $1/M_{GUT}^2$. In SUSY SU(5),
when the effect of flavour changing wave function renormalization is taken into
account such logarithmic correction disappears, provided a condition is met
among SUSY breaking masses. In SUGRA-inspired SUSY GUT the remaining
logarithmic effect is argued not to be taken as a prediction of the theory.


title: On Higgs mechanism in non-perturbative region

abstract:
  A generalization of the Higgs mechanism is considered which takes into
account the contributions of gauge field vacuum configuration into the
formation of the physical vacuum. For the Abelian Higgs model the triviality
bound $m_H\le~1.15m_A$ is found.


title: Diffractive Photoproduction of $\Upsilon$ at HERA

abstract:
  Predictions for the diffractive photoproduction of the $\Upsilon$-family at
HERA energies, within the framework of the analysis by Frankfurt, Koepf and
Strikman, are presented. Two novel effects lead to a significant enhancement of
the original calculation: the non-diagonal (or skewed) kinematics, calculated
to leading-log($Q^2$) accuracy, and the large magnitude of the real part of the
amplitude. The resultant cross sections are found to agree fairly well with
recent preliminary data from ZEUS and H1. A strong correlation between the mass
of the diffractively produced state and the energy dependence of the cross
section is found. In particular, a considerably stronger rise in energy is
predicted than that found in $J/\psi$-production.


title: Low x and diffraction: theory

abstract:
  Some outstanding issues in high energy scattering are discussed. Particular
emphasis is placed on recent developments concerning the next-to-leading log
corrections to the BFKL equation.


title: Final states in small x deep inelastic scattering

abstract:
  This talk summarises our work on the calculation of small-$x$ jet rates
within the BFKL and CCFM approaches. The two approaches are proven to yield the
same results at the leading logarithm level to order ${\bar \alpha}_{S}^{3}$.
The proof is then extended to all orders.


title: Metastable quark-antiquark droplets within the Nambu-Jona-Lasinio model

abstract:
  Chemically non-equilibrated quark-antiquark matter is studied within the
Nambu-Jona-Lasinio model. The equations of state of non-strange (q=u,d) and
strange (q=s) quark-antiquark systems are calculated in the mean-field
approximation. The existence of metastable bound states with zero pressure is
predicted at finite densities and temperatures less than about 50 MeV. It is
shown that the minimum energy per particle occurs for symmetric systems, with
equal densities of quarks and antiquarks. At T=0 these metastable states have
quark number densities of about 0.5 fm^-3 for q=u,d and of 1 fm^-3 for q=s. A
first order chiral phase transition is found at finite densities and
temperatures. The critical temperature for this phase transition is
approximately 75 MeV (90 MeV) for the non-strange (strange) baryon-free
quark-antiquark matter. For realistic choices of parameters, the model does not
predict the phase transition in chemically equilibrated systems. Possible decay
channels of the metastable quark-antiquark droplets and their signatures in
relativistic heavy-ion collisions are discussed.


title:
FeynHiggs: a program for the calculation of the masses of the neutral
  CP-even Higgs bosons in the MSSM

abstract:
  FeynHiggs is a Fortran code for the calculation of the masses of the neutral
CP-even Higgs bosons in the MSSM up to two-loop order. It is based on the
complete diagrammatic on-shell results at the one-loop level, the leading
diagrammatic two-loop QCD contributions and further improvements taking into
account leading electroweak two-loop and leading higher-order QCD corrections.
The Higgs-boson masses are calculated as functions of the MSSM parameters for
general mixing in the scalar top sector and arbitrary choices of the parameters
in the Higgs sector of the model.


title:
Propagator in the Instanton Background and Instanton-Induced Processes
  in Scalar Model

abstract:
  The cross section of the multiparticle scattering processes in the
non-perturbative sector of the scalar -lambda * phi^4 model is studied within
the semiclassical approximation. For this purpose the exact formula for the
residue of the propagator in the instanton background is derived. The exponent
of the cross section is calculated at small energies both analytically and
numerically in the leading and next-to-leading orders in energy. The results
are in agreement with the numerical calculations of ref.[1].


title: Diffraction at HERA, Color Opacity and Nuclear Shadowing

abstract:
  The QCD factorization theorem for diffractive processes in DIS is used to
derive formulae for the leading twist contribution to the nuclear shadowing of
parton distributions in the low thickness limit. Based on the current analyzes
of diffraction at HERA we find that the average strength of the interactions
which govern diffraction in the gluon sector at $x \le 10^{-3}, Q_0=2 GeV$ is
~50 mb. This is 3 times larger than in the quark sector and suggests that
applicability of DGLAP approximation requires significantly larger $Q_0$ in the
gluon sector. We use this information to estimate quark and gluon shadowing for
heavy nuclei and to calculate its$Q^2$ depen- dence. For A~200 the amount of
the gluon shadowing: $G_A/AG_N\sim 0.25-0.4$ at $x<10^{-3},Q=2GeV$ is sensitive
to the probability of the small size configurations within wave function of the
gluon "partonometer" at the $Q_0$ scale. At this scale for $A\sim 200$ the
nonperturbative contribution to the gluon density is reduced by a factor of 4-5
at $x \le 10^{-3}$ unmasking PQCD physics in the gluon distribution of heavy
nuclei. Such shadowing would strongly modify the first stage of the heavy ion
collisions at LHC, and would lead to large color opacity effects in $eA$
collisions at x<0.001. The leading twist contribution to the cross section of
the coherent $J/\psi$ production off $A\ge 12$ nuclei at $\sqrt s \ge 70$ GeV
is strongly reduced as compared to the naive color transparency expectations.
The Gribov black body limit for $F_{2A}(x,Q^2)$ is extended to the case of the
gluon distributions in nuclei and shown to be relevant for the HERA kinematics
of $eA$ collisions. Properties of the final states are also briefly discussed.


title:
Complete 2-loop quantum electrodynamic contributions to the muon
  lifetime in the Fermi model

abstract:
  The complete 2-loop QED contributions to the muon lifetime have been
calculated analytically in the Fermi theory. The exact result for the effects
of virtual and real photons, virtual electrons, muons and hadrons as well as
e+e- pair creation is
  Delta Gamma^(2)=Gamma_0(alpha/pi)^2[(156815/5184)-(1036/27)zeta(2)
  -(895/36)zeta(3)+(67/8)zeta(4)
  +53zeta(2)ln(2)-(0.042+/-0.002)]
  where Gamma_0 is the tree-level width. This eliminates the theoretical error
in the extracted value of the Fermi coupling constant, G_F, which was
previously the source of the dominant uncertainty. The new value is
  G_F=(1.16637 +/- 0.00001) x 10^-5 GeV^-2
  with the error being entirely experimental. Several experiments are planned
for the next generation of muon lifetime measurements and these can proceed
unhindered by theoretical uncertainties.


title: Talk on QCD Calculations by Numerical Integration

abstract:
  Calculations in Quantum Chromodynamics are typically performed using a method
pioneered by Ellis, Ross and Terrano in 1981. In this method, one combines
numerical integrations over the momenta of final state particles with
analytical integrations over the momenta of virtual particles. I discuss a more
flexible method in which one performs all of the integrations numerically.


title: Flavor Changing processes in Quarkonium Decays

abstract:
  We study flavor changing processes $\Upsilon \to B/{\bar B} X_s$ and $J/\psi
\to D/{\bar D} X_u$ in the B factories and the Tau-Charm factories. In the
standard model, these processes are predicted to be unobservable, so they serve
as a probe of the new physics. We first perform a model independent analysis,
then examine the predictions of models; such as TopColor models, MSSM with
R-parity violation and the two Higgs doublet model; for the branching ratios of
$\Upsilon \to B/{\bar B} X_s$ and $J/\psi \to D/{\bar D} X_u$ . We find that
these branching ratios could be as large as $10^{-6}$ and $10^{-5}$ in the
presence of new physics.


title: Violation of Time-Reversal Invariance and CPLEAR Measurements

abstract:
  Motivated by the recent CPLEAR measurement on the time-reversal
non-invariance, we review the situation concerning the experimental
measurements of charge conjugation, parity violation and time reversibility, in
systems with non-Hermitean Hamiltonians. This includes in particular neutral
meson systems, like K0-barK0, D0-barD0 and B0-barB0. We discuss the formalism
that describes particle-antiparticle mixing and time evolution of states,
paying particular emphasis to the orthogonality conditions of incoming and
outgoing states. As a result, we confirm that the CPLEAR experiment makes a
direct measurement of violation of time-reversal without any assumption of
unitarity and CPT-violation. The asymmetry which signifies T-violation, is
found to be independent of time and decay processes.


title: The cold axion populations

abstract:
  We give a systematic discussion of the contributions to the cosmological
energy density in axions from vacuum realignment, string decay and wall decay.
We call these the cold axion populations because their kinetic energy per
particle is at all times much less than the ambient temperature. In case there
is no inflation after the Peccei-Quinn phase transition, the value of the axion
mass for which axions contribute the critical energy density for closure is
estimated to be of order $6 \cdot 10^{-6}$ eV, with large uncertainties. It is
emphasized that there are two groups of cold axions differing in velocity
dispersion by a factor of order $10^3$.


title:
Pseudoscalar Higgs production in association with stop and sbottom pairs
  at the LHC in the MSSM

abstract:
  We study the processes `gluon gluon -> squark antisquark CP-odd Higgs' within
the theoretical framework of the Supergravity (SUGRA) inspired Minimal
Supersymmetric Standard Model (MSSM) at the leading order (LO) in perturbative
Quantum Chromo-Dynamics (QCD). Other than constituting a novel production
mechanism of the neutral, CP-odd Higgs particle, they also allow one to relate
the size of the corresponding production rates to the ratio of the vacuum
expectation values of the two Higgs fields tan(beta), to the trilinear
couplings A_0 and to the sign of the Higgsino mass term sign(mu). This
interplay is made easier by the absence of any mixing in the
{tilde{q}}_1{tilde{q}}_2 A vertices, contrary to the case of all other Higgs
bosons of the theory.


title:
On the Factorial Moment Analysis of High Energy Experimental Data with
  Non-integer Partition Number

abstract:
  It is pointed out that in doing the factorial moment analysis with
non-integer partition $M$ of phase space, the influence of the phase-space
variation of two- (or more-) particle correlations has to be considered
carefully. In this paper this problem is studied and a systematic method is
developed to minimize this influence. The efficiency and self-consistency of
this method are shown using the data of 250 GeV/$c$ $\pi^+$p and K$^+$p
collisions from the NA22 experiment as example.


title: Spin Asymmetries In Diffractive $J/\Psi$ Leptoproduction

abstract:
  In this report we calculate the cross section and $A_{ll}$ asymmetry for the
diffractive $J/\Psi$ leptoproduction. We study dependences of the asymmetry on
the structure of the Pomeron-proton coupling


title: Target Mass Corrections to the Spin-dependent Structure Functions

abstract:
  The target mass corrections to the twist-2 contributions of the
spin-dependent structure functions are calculated using operator product
expansion in lowest order in QCD. The influence of such corrections to the
different relations between the structure functions is considered.


title: Presion tests of the SM: higher order corrections and the Higgs mass

abstract:
  Recent calculations of the two-loop electroweak effects enhanced by powers of
the top mass have been implemented in the main electroweak libraries and have
an important effect on the indirect determination of the Higgs mass MH. I
briefly review the main results of these calculations and discuss in detail the
residual uncertainties and their impact on the global fit to MH. The
perspectives for the near future are also considered.


title:
Topological Charge Screening and the `Proton Spin' Beyond the Chiral
  Limit

abstract:
  The theory of the `proton spin' effect proposed in our earlier papers is
extended to include the chiral SU(3) symmetry breaking and flavour mixing
induced by non-vanishing quark masses in QCD. The theoretical basis is the
derivation of exact, unified Goldberger-Treiman (GT) relations valid beyond the
chiral limit. The observed suppression in the flavour singlet axial charge
$a^0(Q^2)$ is explained by an anomalously small value for the slope of the
singlet current correlation function $<0|T~\pl^\m J_{\m 5}^0 ~ \pl^\n J_{\n
5}^0 |0>$, a consequence of the screening of topological charge in the QCD
vacuum. Numerical predictions are obtained by evaluating the current
correlation functions using QCD spectral sum rules. The results, $a^0(Q^2) =
0.31 \pm 0.02$ and $\int dx ~g_1^p(x,Q^2) = 0.141 \pm 0.005$ (at $Q^2=10
\~\GV^2$), are in good agreement with current experimental data on the
polarised proton structure function $g_1^p$.


title: F_2 at low Q^2

abstract:
  We analyse the data for the proton structure function $F_2$ over the entire
$Q^2$ domain, including especially low $Q^2$, in terms of perturbative and
non-perturbative QCD contributions. The small distance configurations are given
by perturbative QCD, while the large distance contributions are given by the
vector dominance model and, for the higher mass $q \overline{q}$ states, by the
additive quark approach.


title:
Off-mass-shell Sudakov-like suppression factor for the fermionic
  four-point function in QCD

abstract:
  We consider a four-point process, associated with a wide-angle elastic
scattering of two off-mass-shell spin-1/2 matter particles, in a non-abelian
gauge theory. On the basis of a worldline approach, which reverts the
functional to a path-integral description of the system, we factorize an
eikonal (``soft'') subsector of the full theory and calculate the Sudakov-like
suppression factor for the four-point function as a whole, once we have
extracted the associated anomalous dimensions and taken into account the
renormalization-group controlled evolution.


title: Duality symmetry of Reggeon interactions in multicolour QCD

abstract:
  The duality symmetry of the Hamiltonian and integrals of motion for Reggeon
interactions in multicolour QCD is formulated as an integral equation for the
wave function of compound states of $n$ reggeized gluons. In particular the
Odderon problem in QCD is reduced to the solution of the one-dimensional
Schr\"odinger equation. The Odderon Hamiltonian is written in a normal form,
which gives a possibility to express it as a function of its integrals of
motion.


title: Fully Supersymmetric CP Violation in K and B Systems

abstract:
  We analyze CP violation in supersymmetric extensions of the Standard Model
with heavy scalar fermions of the first two generations. Neglecting
intergenerational mixing in the sfemion mass matrices and thus considering only
chargino, charged Higgs and W--boson diagrams we show that it is possible to
fully account for CP violation in the kaon system even in the absence of the
standard CKM phase. This opens new possibilities for large supersymmetric
contributions to CP violation in the B system.


title:
Anomalous U(1), holomorphy, supersymmetry breaking and dilaton
  stabilization

abstract:
  We argue that in certain models with family symmetries the implementation of
the alignment mechanism for the supression of the flavor changing neutral
currents requires mass matrices with holomorphic zeros in the down quark
sector. Holomorphic zeros typically open flat directions that potentially spoil
the uniqueness of the supersymmetric vacuum. We then present an anomalous U(1)
model without holomorphic zeros in the quark sector that can reproduce the
fermion mass hierarchies, provided that $\tan{\beta}$ is of order one. To avoid
undesired flavor changing neutral currents we propose a supersymmetry breaking
mechanism and a dilaton stabilization scenario that result in degenerate
squarks at $M\sim M_{GUT}$ and a calculable low energy spectrum. We present the
numerical predictions of this model for the Higgs mass for different values of
$M$ and $\tan{\beta}$.


title: Probability and QCD

abstract:
  The probabilities of point events in space 3 + 1 obey an equation of Dirac
type. Masses, moments, energies, spins, etc. are the parameters of the
probability distribution of such events. The terms and equations of quark-gluon
theories turn out theoretically probabilistic terms and theorems. Confinement
and asymptotic freedom are explained by behaviour of such probabolities. And
here we have the probabilistic foundations of the theory of gravitation.
Knowledge of the elements of linear algebra and differential calculus is
sufficient to understand the content of this article.


title: Light Gluino Predictions for Jet Cross Sections in Tevatron Run II

abstract:
  The CDF inclusive jet transverse energy cross section at 1.8 TeV suggests
anomalous behavior at both low and high transverse energies. In addition the
scaled ratio of the 0.63 TeV to 1.8 TeV data lies significantly below the
standard model prediction and suggests structure not attributable to standard
model processes. These anomalies are in line with what would be expected in the
light gluino scenario. We perform a unified fit and extrapolate to two TeV to
predict the results at run II.


title: Note on Shadowing and Diffraction in Deep-Inelastic Lepton Scattering

abstract:
  We discuss the close relation between shadowing in deep-inelastic
lepton-nucleus scattering and diffractive photo- and leptoproduction of hadrons
from free nucleons. We show that the magnitude of nuclear shadowing at small
Bjorken-x, as measured by the E665 and NMC collaborations, is directly related
to HERA data on the amount of diffraction in the scattering from free nucleons.


title:
Parametric Amplification of Density Perturbation in the Oscillating
  inflation

abstract:
  We study the adiabatic density perturbation in the {\it oscillating
inflation}, proposed by Damour and Mukhanov. The recent study of the
cosmological perturbation during reheating shows that the adiabatic fluctuation
behaves like as the perfect fluid and no significant amplification occurs on
super-horizon scales. In the oscillating inflation, however, the accelerated
expansion takes place during the oscillating stage and there might be a
possibility that the parametric amplification on small scales affects the
adiabatic long-wavelength perturbation. We analytically show that the density
perturbation neglecting the metric perturbation can be amplified by the
parametric resonance and the instability band becomes very broad during the
oscillating inflation. We examined this issue by solving the evolution equation
for perturbation numerically. We found that the parametric resonance is
strongly suppressed for the long wave modes comparable to the Hubble horizon.
The result indicates that the metric perturbation plays a crucial role for the
evolution of scalar field perturbation. Therefore, in the single field case,
there would be no significant imprint of the oscillating inflation on the
primordial spectrum of the adiabatic perturbation. However, it could be
expected that the oscillating inflation in the multi-field system gives the
enormous amplification on large scales, which may lead to the production of the
primordial black holes.


title:
Octet Magnetic Moments with Null Instantons and Semibosonized
  Nambu-Jona-Lasinio Model

abstract:
  It is shown that the difference between the magnetic moment results in the
quark model with null instantons and semibosonized Nambu-Jona-Lasinio model
lies in the description of the magnetic moment of the $ \Lambda$-hyperon.


title: Splitting of Three Nearly Mass-Degenerate Neutrinos

abstract:
  Assuming the canonical seesaw mechanism together with an SO(3) family
symmetry for leptons, broken only by the charged-lepton masses, I show that the
three neutrinos of Majorana mass $m_0$ are split radiatively in two loops by a
maximum finite calculable amount of order $10^{-9} m_0$. This is very suitable
for dark matter and vacuum solar neutrino oscillations. I also discuss how
atmospheric neutrino oscillations can be incorporated.


title: Superheavy Dark Matter from Thermal Inflation

abstract:
  It is quite plausible that the mass of the dark matter particle increases
significantly after its freeze-out, due to a scalar field rolling to large
values. We describe a realization of this scenario in the context of thermal
inflation which naturally gives a cold dark matter particle with the correct
cosmological abundance and a mass around $10^{10} {\rm GeV}$, evading the
conventional upper bound of $10^5 {\rm GeV}$. We also discuss another
realization which could produce a cosmologically interesting abundance of near
Planck mass, possibly electromagnetically charged, particles. The detection and
observational consequences of superheavy cold dark matter or WIMPZILLAs are
briefly examined.


title: Enhanced electroweak radiative corrections in SUSY and precision data

abstract:
  Enhanced radiative corrections generated in SUSY extensions of the Standard
Model make the fit of the precision data ($Z$-boson decay parameters and
$W$-boson mass) worse. This negative effect is washed out for heavy enough
squarks due to decoupling property of SUSY models. We find that even for light
squarks the enhanced radiative corrections can be small. In this case
substantial $\tilde{t}_L \tilde{t}_R$ mixing is necessary.


title: Strong and electromagnetic decays for excited heavy mesons

abstract:
  We discuss a model for heavy mesons where the light quark (u or d) moves in
the colour electric field from a heavy quark (c or b) placed in the center of
the bag. We calculate energy spectra for pionic and photonic transitions from
excited states. The transition amplitudes and the branching ratios between
electromagnetic and pionic transitions compares favorable with the limited
amount of known experimental data.


title:
The NLO DGLAP extraction of $\alpha_s$ and higher twist terms from CCFR
  $xF_3$ and $F_2$ structure functions data for $\nu N$ DIS

abstract:
  We performed the detailed NLO analysis of the combined CCFR $xF_3$ and $F_2$
structure functions data and extracted the value of $\alpha_s$, parameters of
distributions and higher-twist (HT) terms using the direct solution of the
DGLAP equation. The value of $\alpha_s(M_Z)=0.1222\pm 0.0048 (exp)\pm
0.0040(theor)$ was obtained. The result has larger central value and errors,
than the original result of the CCFR collaboration, in view of the
incorporation into the fits of the HT terms as the free model independent
parameters. The $x$-shapes of the HT contributions to $xF_3$ and $F_2$ are in
agreement with the results of other model-independent extractions and are in
qualitative agreement with the predictions of the infrared renormalon model. We
also argue that the low $x$ CCFR data might have the defects, since their
inclusion into the fits led to the following low $x$-behaviour of the gluon
distribution $xG(x,9 GeV^2) \sim x^{0.092\pm 0.0073}$, in contradiction with
the results of its extraction from low $x$ HERA data.