title: Real photon structure at an e^+e^- linear collider

abstract:
  Previous studies of the kinematic coverage for measuring the photon structure
function F_2^gamma at a future 500 GeV e^+e^- linear collider are updated using
current estimates of luminosities and important detector parameters. The
perturbative expansion for the evolution of F_2^gamma is briefly recalled in
view of a recent claim that all existing next-to-leading order analyses of the
photon structure are incorrect. A simple illustration is given of the different
sensitivities of hadronic and photonic structure functions on the strong
coupling constant alpha_s.


title: The Dynamics of Affleck-Dine Condensate Collapse

abstract:
  In the MSSM, cosmological scalar field condensates formed along flat
directions of the scalar potential (Affleck-Dine condensates) are typically
unstable with respect to formation of Q-balls, a type of non-topological
soliton. We consider the dynamical evolution of the Affleck-Dine condensate in
the MSSM. We discuss the creation and linear growth, in F- and D-term inflation
models, of the quantum seed perturbations which in the non-linear regime
catalyse the collapse of the condensate to non-topological soliton lumps. We
study numerically the evolution of the collapsing condensate lumps and show
that the solitons initially formed are not in general Q-balls, but Q-axitons, a
pseudo-breather which can have very different properties from Q-balls of the
same charge. We calculate the energy and charge radiated from a spherically
symmetric condensate lump as it evolves into a Q-axiton. We also discuss the
implications for baryogenesis and dark matter.


title: Solution to the evolution equation for high parton density QCD

abstract:
  In this paper a solution is given to the nonlinear equation which describes
the evolution of the parton cascade in the case of the high parton density.
  The related physics is discussed as well as some applications to heavy
ion-ion collisions.


title: The field strength correlator from QCD sum rules

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


title: Leptoquark and R-Parity Violating SUSY Processes

abstract:
  Pair production of leptoquarks at future e+e- linear colliders is
investigated for center-of-mass energies of 500 GeV and 800 GeV and an
integrated luminosity of 500 fb^-1. Based on a Monte Carlo simulation we
estimate the event rates for signal as well as background processes and
evaluate the discovery potential. As an example of virtual effects we consider
deviations from standard model predictions due to R-parity violating sneutrino
exchange in purely leptonic processes.


title: Theory of the Magnetic Catalysis of Chiral Symmetry Breaking in QED

abstract:
  The theory of the magnetic catalysis of chiral symmetry breaking in QED is
developed. An approximation for the Schwinger-Dyson equations describing
reliably this phenomenon is established, i.e., it is shown that there exists a
consistent truncation of those equations in this problem. The equations are
solved both analytically and numerically, and the dynamical mass of fermions is
determined.


title:
Perturbative fragmentation of vector colored particle into bound states
  with a heavy antiquark

abstract:
  The fragmentation function of vector particle into possible bound S-wave
states with a heavy antiquark is calculated in the leading order of
perturbative QCD for the high energy processes at large transverse momenta with
the different behaviour of anomalous chromomagnetic moment. One-loop equations
are derived for the evolution of fragmentation function moments, which is
caused by the emission of hard gluons by the vector particle. The integrated
probabilities of fragmentation are given. The distribution of bound state over
the transverse momentum with respect to the axis of fragmentation is calculated
in the scaling limit.


title: Light-Quark Mesons and Four-Quark Condensates at Finite Temperature

abstract:
  We propose an analog of the familiar gap equation for the case of four-quark
condensates at finite temperature. The condensates of interest correspond to
scalar, vector, psudoscalar, axial vector, and tensor Dirac structures. Working
with correlators at zero chemical potential without factorization, we arrive at
coupled equations for these four-quark condensates and the masses of certain
light-quark mesons. We study the temperature dependence of the four-quark
condensates and masses; in one of our models, factorization of the four-quark
condensates is shown to be increasingly violated as the temperature is
increased toward $T_c$. The 2$^{++}$ tensor mesons a$_2$(1320)-f$_2$(1270) are
identified as especially sensitive probes of the four-quark condensates.


title:
Hard-thermal-loop Resummation of the Free Energy of a Hot Quark-Gluon
  Plasma

abstract:
  The quark contribution to the free energy of a hot quark-gluon plasma is
calculated to leading order in hard-thermal-loop (HTL) perturbation theory.
This method selectively resums higher order corrections associated with plasma
effects, such as screening, quasiparticles, and Landau damping. Comparing to
the weak-coupling expansion of QCD, the error in the one-loop HTL free energy
is of order alpha_s, but the large alpha_s^(3/2) correction from QCD plasma
effects is included exactly.


title: K_L -> pi pi e e in Chiral Perturbation Theory

abstract:
  The rare decay K_L -> pi pi e e that has recently been observed by KTeV is
analyzed in chiral perturbation theory at the one-loop level.


title:
Comment on the broadening of the $^7$Be neutrino line in vacuum
  oscillation solutions of the solar neutrino

abstract:
  We consider the effect of thermal broadening of the $^7$Be neutrino on vacuum
oscillation solutions of the solar neutrino problem and analyze the conditions
under which the electron-neutrino survival probability must be averaged over
neutrino energy. For "just-so" solutions with $\Delta m^2$ of order $5 \times
10^{-11}~{\rm eV}^2$ averaging is not necessary, but for much larger values, it
is. We analyze the effective broadening due to the extended production region
in the Sun and find similar results. We also comment on the possibility of
seasonal variations of the $^7$Be neutrino signal.


title: Superstring Theory and CP- Violating Phases: Can They Be Related?

abstract:
  We investigate the possibility of large CP- violating phases in the soft
breaking terms derived in superstring models. The bounds on the electric dipole
moments (EDM's) of the electron and neutron are satisfied through cancellations
occuring because of the structure of the string models. Three general classes
of four-dimensional string models are considered: (i) orbifold
compactifications of perturbative heterotic string theory, (ii) scenarios based
on Ho\v{r}ava-Witten theory, and (iii) Type I string models (Type IIB
orientifolds). Nonuniversal phases of the gaugino mass parameters greatly
facilitate the necessary cancellations among the various contributions to the
EDM's; in the overall modulus limit, the gaugino masses are universal at tree
level in both the perturbative heterotic models and the Ho\v{r}ava-Witten
scenarios, which severely restricts the allowed regions of parameter space.
Nonuniversal gaugino masses do arise at one-loop in the heterotic orbifold
models, providing for corners of parameter space with ${\cal O}(1)$ phases
consistent with the phenomenological bounds. However, there is a possibility of
nonuniversal gaugino masses at tree level in the Type I models, depending on
the details of the embedding of the SM into the D- brane sectors. We find that
in a minimal model with a particular embedding of the Standard Model gauge
group into two D- brane sectors, viable large phase solutions can be obtained
over a wide range of parameter space.


title: Precision Observables and Electroweak Theories

abstract:
  We compute the bounds from precision observables on alternative theories of
electroweak symmetry breaking. We show that a cut-off as large as 3 TeV can be
accomodated by the present data, without unnatural fine tuning.


title: New Higgs Signals from Flavor Physics in Large Extra Dimensions

abstract:
  In a realistic theory with large extra dimensions and TeV scale gravity,
there are often other particles living in the extra dimensions in addition to
gravitons. A well motivated candidate is the flavon in a flavor theory which
explains the smallness of the fermion masses by the large volume of the extra
dimensions. The flavon interactions involve the Higgs field and can therefore
give rise to new mechanisms of Higgs boson production. We study these new Higgs
signals, including both real flavon emission and virtual flavon exchange. They
could provide powerful probes of the string scale which are comparable to the
extensively studied graviton production, if the flavons and the graviton feel
the same number of extra dimensions. If the flavons only live in a subspace of
the extra dimensions, they can yield even stronger bounds and may generate
spectacular displaced vertex signals. Our study also applies to a four
dimensional flavor theory with light flavons as well as to any theory with bulk
scalar fields coupled to the Higgs and fermions.


title:
Lowest-Lying Scalar Mesons and a Possible Probe of Their Quark
  Substructure

abstract:
  In this talk, an overview of the status of the light scalar mesons in the
context of the non linear chiral Lagrangian of references [1-3] is presented.
The evidence for the existence of a scalar nonet below 1 GeV is reviewed, and
it is shown that by introducing a scalar nonet an indirect way of probing the
quark substructure of these scalars through the scalar mixing angle can be
obtained. It is then reviewed that consistency of this non-linear chiral
Lagrangian framework with the experimental data on pi pi and pi K scattering,
as well as the decay eta' to eta pi pi, results in a range for the mixing angle
which indicates that the quark substructure of these light scalars are closer
to a four quark picture.


title: The Phenomenology of a Top Quark Seesaw Model

abstract:
  The top quark seesaw mechanism offers a method for constructing a composite
Higgs field without the usual difficulties that accompany traditional
technicolor or topcolor theories. The focus of this article is to study the
phenomenology of the new physics required by this mechanism. After establishing
a set of criteria for a plausible top quark seesaw theory, we develop two
models, the first of which has a heavy weak singlet fermion with hypercharge
4/3 while the second has, in addition, a heavy weak singlet hypercharge -2/3
fermion. At low energies, these theories contain one or two Higgs doublets
respectively. We then derive the low energy effective Higgs potential in detail
for the two-doublet theory as well as study the likely experimental signatures
for both theories. A strong constraint on the one-doublet model is the measured
value of the rho parameter which permits the new heavy fermion to have a mass
of about 5-7 TeV, when the Higgs has a mass greater than 300 GeV. In the
two-doublet model, mixing of the new heavy Y=-2/3 fermion and the b quark
affects the prediction for R_b. In order to agree with the current limits on
R_b, the mass of this fermion should be at least 12 TeV. The mass of the heavy
Y=4/3 fermion in the two-doublet model is not as sharply constrained by
experiments and can be as light as 2.5 TeV.


title: Solving the QCD Hamiltonian for bound states

abstract:
  The systematic approach to study bound states in quantum chromodynamics is
presented. The method utilizes nonperturbative flow equations in the confining
background, that makes possible to perform perturbative renormalization and to
bring the QCD Hamiltonian to a block-diagonal form with the number of
quasiparticles conserving in each block. The effective block-diagonal
Hamiltonian provides constituent description for hadron observables. The
renormalized to the second order effective Hamiltonian of gluodynamics in the
Coulomb gauge is obtained at low energies. The masses for scalar and
pseudoscalar glueballs are predicted.


title:
U_A(1) Symmetry Breaking and eta, eta prime mesons in the Bethe-Salpeter
  Approach

abstract:
  U_A(1) symmetry breaking is studied by introducing the flavor mixing
interaction proposed by Kobayashi, Maskawa and 't Hooft. Combining the one
gluon exchange interaction, the rainbow like Schwinger-Dyson equation and the
ladder like Bethe-Salpeter equation are derived. The anomalous PCAC relation in
the framework of this approximation is considered. The masses of the
pseudoscalar mesons pi,eta and eta' are calculated. It is found that the pion
mass is not sensitive to the strength of the flavor mixing interaction. On the
other hand, the masses of eta and eta' are reproduced by a relatively weak
flavor mixing interaction, for which the chiral symmetry breaking is dominantly
induced by the soft-gluon exchange interaction. The decay constants are
calculated and the anomalous PCAC relation is numerically checked. It is found
that the flavor structures of the eta and eta' mesons significantly depend on
their masses and therefore it is quetionable to define a flavor mixing angle
for eta and eta'.


title: Gravitational production of gravitinos

abstract:
  We calculate the number density of helicity $\pm3/2$ gravitinos produced out
of the vacuum by the non-static gravitational field in a generic inflation
scenario. We compare it to the number density of gravitinos produced in
particle interactions during reheating.


title:
NLO corrections and contribution of a tensor gluon operator to the
  process $\gamma^*\gamma\to \pi\pi$

abstract:
  We have calculated the NLO corrections for the leading twist amplitude of the
reaction $\gamma^*\gamma\to\pi\pi$ at large virtuality of the photon and at
$W^2\ll Q^2$. With a simple model for the two-pion quark and gluon distribution
amplitudes we have estimated that the NLO effects may reduce the leading-order
amplitude by as much as 30%. We have found that besides the usual twist-2 quark
and gluon operators the NLO amplitude receives contribution from a distribution
associated with twist-2 tensor gluon operator. The new gluon distribution can
be investigated by studying the azimuthal asymmetry of the cross section for
$e+\gamma\to e'+\pi\pi$.


title: Early years of neutrino oscillations

abstract: The first papers on neutrino oscillations are shortly reviewed.


title: Color Octet Contribution to J/psi Photoproduction Asymmetries

abstract:
  We investigate $J/\psi$ photoproduction asymmetries in the framework of the
NRQCD factorization approach. It is shown that the color octet contribution
leads to large uncertainties in the predicted asymmetries which rules out the
possibility to precisely measure the gluon polarization in the nucleon through
this final state. For small values of the color octet parameters being
compatible with $J/\psi$ photoproduction data it appears possible that a
measurement of $J/\psi$ asymmetries could provide a new test for the NRQCD
factorization approach, on one hand, or a measurement of the polarized gluon
distribution from low inelasticity events $(z<0.7)$, on the other


title: Deeply virtual Compton scattering in next-to-leading order

abstract:
  We study the amplitude of deeply virtual Compton scattering in
next-to-leading order of perturbation theory including the two-loop evolution
effects for different sets of skewed parton distributions (SPDs). It turns out
that in the minimal subtraction scheme the relative radiative corrections are
of order 20-50%. We analyze the dependence of our predictions on the choice of
SPD, that will allow to discriminate between possible models of SPDs from
future high precision experimental data, and discuss shortly theoretical
uncertainties induced by the radiative corrections.


title:
CP- and T-Violation in the Decay K_L -> pi+ pi- e+ e- and Related
  Processes

abstract:
  I review the theoretical basis of the prediction that the decay K_L -> pi+
pi- e+ e- should show a large CP- and T-violation, a prediction now confirmed
by the KTeV experiment. The genesis of the effect lies in a large violation of
CP- and T-invariance in the decay K_L -> pi+ pi- gamma, which is encrypted in
the polarization state of the photon. The decay K_L -> pi+ pi- e+ e- serves as
an analyser of the photon polarization. The asymmetry in the distribution of
the angle phi between the pi+ pi- and e+ e- planes is a direct measure of the
CP-odd, T-odd component of the photon's Stokes vector. A complete study of the
angular distribution can reveal further CP-violating features, which probe the
non-radiative (charge-radius and short-distance) components of the K_L -> pi+
pi- e+ e- amplitude.


title: The Onset of Deconfinement in Nuclear Collisions

abstract:
  We first consider the origin of colour deconfinement, comparing in particular
spontaneous symmetry breaking and percolation. Next we specify the onset of
deconfinement in nuclear collisions through parton percolation, and with
parameters determined at SPS energy, we give quantitative predictions for
charmonium suppression at RHIC. Finally we show that the parton cascade model
leads to similar predictions, starting from a microscopic description of the
space-time evolution of the collision.


title: Recent Theoretical Developments in CP Violation in the B System

abstract:
  After a brief review of the present status of the standard methods to extract
CKM phases from CP-violating effects in non-leptonic B-decays, an overview of
recent theoretical developments in this field is given, including extractions
of $\gamma$ from $B\to\pi K$ and $B_{s(d)}\to J/\psi K_S$ decays, a
simultaneous determination of $\beta$ and $\gamma$, which is provided by the
modes $B_d\to \pi^+ \pi^-$ and $B_s\to K^+ K^-$, and extractions of CKM phases
from angular distributions of certain $B_{d,s}$ decays, such as $B_d\to J/\psi
\rho^0$ and $B_s\to J/\psi \phi$.


title: New Strategies to Extract CKM Phases from Non-Leptonic B Decays

abstract:
  Several new strategies to extract CKM phases, including a determination of
$\gamma$ from $B_{s(d)}\to J/\psi K_S$ decays and a general approach, which
makes use of the angular distributions of certain $B_{d,s}$ modes, such as
$B_d\to J/\psi \rho^0$ and $B_s\to J/\psi \phi$, are discussed. Special
emphasis is put on a simultaneous determination of $\beta$ and $\gamma$ with
the help of the decays $B_d\to \pi^+ \pi^-$ and $B_s\to K^+ K^-$, which relies
only on the $U$-spin flavour symmetry of strong interactions and is not
affected by any penguin or final-state-interaction effects.


title: New Possibilities for a Light Gluino

abstract:
  Despite many positive indirect indications of light gluinos direct searches
for the expected signatures of gluino containing hadrons have so far turned up
negative severely restricting the allowable windows in gluino mass. After
briefly reviewing the status, we discuss a possible new decay scenario that
could have allowed light gluinos to evade direct detection with possible
consequences for other measurements.


title: CP Violation and B Physics

abstract:
  This is a quick review of CP non-conservation in $B$ physics. Several methods
are described for testing the Kobayashi-Maskawa single phase origin of CP
violation in B decays, pointing out some limitations due to hadronic
uncertainties. A few characteristic signatures of new physics in B decay
asymmetries are listed.


title: Pseudo-spin of time-like lepton and the solar neutrino problem

abstract:
  Based on the dual principle in super-luminous Lorentz transformation this
work shows that pseudo-spin of a time-like bradyon appears to space-like
observers as iso-spin of a corresponding tachyon. Due to the weak interaction,
lepton-tachyon appears as neutrino with hidden imaginary transcendent mass,
suppressed by a factor of $\rho\sim G_F m^2_0$ compared to the rest mass $m_0$
of a corresponding space-like lepton. Assuming a coexistance of tachyon dark
matter in the solar system, we show that the solar neutrino deficit might be
explained by depolarisation of time-like electrons due to elastic scattering in
time-like plasma and the maximal deficit would reach 0.5. Neither day-night nor
seasonal effects are expected due to dynamic balance of fluxes with opposite
pseudo-spin polarisation.


title: Probing Anomalous Top-Couplings at Polarized Linear Collider

abstract:
  The energy spectra of the lepton(s) in eebar --> ttbar --> l^{+-}X/ l^+l^- X'
at next linear colliders (NLC) are analyzed a model-independent way for
arbitrary longitudinal beam polarizations as a general test of possible
anomalous top-quark couplings.


title: Polarized $\Lambda_b\to \Lambda_c l \bar{\nu}$ decay in perturbative QCD

abstract:
  We study the polarized $\Lambda_b$ baryon semileptonic decay $\Lambda_b \to
\Lambda_cl{\bar\nu}$ using perturbative QCD factorization theorem. In this
approach heavy baryon transition form factors are expressed as the convolutions
of hard $b$ quark decay amplitudes with universal $\Lambda_b$ and $\Lambda_c$
baryon wave functions. With the heavy baryon wave functions determined in our
previous work, we predict the asymmetry parameter $\alpha({\hat e})\equiv
(N_+-N_-)/(N_++N_-)=-0.31 {\bf P}\cdot{\hat e}$, where ${\bf P}$ is the
$\Lambda_b$ baryon polarization, ${\hat e}$ a unit vector perpendicular to the
$\Lambda_b$ baryon momentum, $N_+$ ($N_-$) the number of leptons whose momenta
possess positive (negative) components along ${\hat e}$. This result is useful
for extracting the transverse polarization of a $\Lambda_b$ baryon from data of
exclusive semileptonic decays.


title: Gravitational Trapping for Extended Extra Dimension

abstract:
  The solution of Einsteins equations for 4-brane embedded in 5-dimensional
Anti-de-Sitter space-time is found. It is shown that the cosmological constant
can provide the existence of ordinary 4-dimensional Newton's low and trapping
of a matter on the brane.


title: Diffractive Photoproduction in the Framework of Fracture Functions

abstract:
  Recent data on diffractive photoproduction of dijets are analyzed within the
framework of fracture functions and paying special attention to the
consequences of the use of different rapidity gap definitions in order to
identify diffractive events. Although these effects are found to be
significant, it is shown that once they are properly taken into account, a very
precise agreement between diffractive DIS and diffractive dijet photoproduction
emerges without any significant hint of hard factorization breaking.


title:
The NLO DGLAP extraction of alpha_s and higher twist terms from CCFR
  xF_3 and F_2 structure functions data: results and scale dependence

abstract:
  We perform a detailed NLO analysis of the combined CCFR xF_3 and F_2
structure functions data and extract the value of alpha_s, parameters of
distributions and higher-twist (HT) terms using a direct solution of the DGLAP
equation. The value of alpha_s(M_Z)=0.1222\pm 0.0048 (exp) \pm 0.0026 (theor)
is obtained. Our results has a larger central value and errors than the
original one of the CCFR collaboration due to model independent
parameterization of the HT contributions. The dependence of HT contributions on
the QCD renormalization scale is studied.


title: Double Inflation in Supergravity and the Large Scale Structure

abstract:
  The cosmological implication of a double inflation model with hybrid + new
inflations in supergravity is studied. The hybrid inflation drives an inflaton
for new inflation close to the origin through supergravity effects and new
inflation naturally occurs. If the total e-fold number of new inflation is
smaller than $\sim 60$, both inflations produce cosmologically relevant density
fluctuations. Both cluster abundances and galaxy distributions provide strong
constraints on the parameters in the double inflation model assuming
$\Omega_0=1$ standard cold dark matter scenario. The future satellite
experiments to measure the angular power spectrum of the cosmic microwave
background will make a precise determination of the model parameters possible.


title: New Minimal Extension of MSSM

abstract:
  We construct a new minimal extension of the Minimal Supersymmetric Standard
Model (MSSM) by promoting the $\mu$-parameter to a singlet superfield. The
resulting renormalizable superpotential is enforced by a $\mathcal{Z}_5$
$R$-symmetry which is imposed on the non-renormalizable operators as well. The
proposed model provides a natural solution to the $\mu$-problem and is free
from phenomenological and cosmological problems.


title:
Constraints on a general 3-generation neutrino mass matrix from neutrino
  data: application to the MSSM with R-parity violation

abstract:
  We consider a general symmetric $(3\times 3)$ mass matrix for three
generations of neutrinos. Imposing the constraints, from the atmospheric
neutrino and solar neutrino anomalies as well as from the CHOOZ experiment, on
the mass squared differences and on the mixing angles, we identify the ranges
of allowed inputs for the 6 matrix elements. We apply our results to Majorana
left-handed neutrino masses generated at tree level and through
fermion--sfermion loop diagrams in the MSSM with R-parity violation. The
present experimental results on neutrinos from laboratories, cosmology and
astrophysics are implemented to either put bounds on trilinear ($\lambda_{ijk},
\lambda'_{ijk}$) and bilinear
  ($\mu_{e,\mu,\tau}$) R-parity-violating couplings or constrain combinations
of products of these couplings.


title:
CP, T and CPT versus temporal asymmetries for entangled states of the
  Bd-system

abstract:
  The observables used in the K-system to characterize T and CPT violation are
no longer useful for the Bd-system, since the width difference between the
physical states is vanishingly small. We show that only Im(epsilon) and
Re(delta) can survive if Delta Gamma=0, and build alternative CP-odd, CPT-odd,
T-odd and temporal asymmetries for the (B_CP -> B0, B0bar) transitions. These
quantities enable us to test T and CPT invariances of the effective Hamiltonian
for the B-system. The method needs the CP eigenstates B_CP, which can be tagged
unambiguously to order lambda^3 from the entangled states of a B-factory.


title: Pauli-Villars regularization in DLCQ

abstract:
  Calculations in a (3+1)-dimensional model indicate that Pauli-Villars
regularization can be combined with discrete light-cone quantization (DLCQ) to
solve at least some field theories nonperturbatively. Discrete momentum states
of Pauli-Villars particles are included in the Fock basis to automatically
generate needed counterterms; the resultant increase in basis size is found
acceptable. The Lanczos algorithm is used to extract the lowest massive
eigenstate and eigenvalue of the light-cone Hamiltonian, with basis sizes
ranging up to 10.5 million. Each Fock-sector wave function is computed in this
way, and from these one can obtain values for various quantities, such as
average multiplicities and average momenta of constituents, structure
functions, and a form-factor slope.


title:
Expected Polarization of $\Lambda$ particles produced in deep inelastic
  polarized lepton scattering

abstract:
  We calculate the polarization of Lambda and Anti-Lambda particles produced in
deep inelastic polarized lepton scattering. We use two models: the naive quark
model and a model in which SU(3)$_F$ symmetry is used to deduce the spin
structure of SU(3) octet hyperons from that of the proton. We perform the
calculations for Lambda and Anti-Lambda produced directly or as decay products
of $\Sigma^0$ and $\Sigma^*$.


title:
Charge Radii and Magnetic Polarizabilities of the Rho and K* Mesons in
  QCD String Theory

abstract:
  The effective action for light mesons in the external uniform static
electromagnetic fields was obtained on the basis of QCD string theory. We imply
that in the presence of light quarks the area law of the Wilson loop integral
is valid. The approximation of the Nambu-Goto straight-line string is used to
simplify the problem. The Coulomb-like short-range contribution which goes from
one-gluon exchange is also neglected. We do not take into account spin-orbital
and spin-spin interactions of quarks and observe the $\rho$ and $K^*$ mesons.
The wave function of the meson ground state is the Airy function. Using the
virial theorem we estimate the mean charge radii of mesons in terms of the
string tension and the Airy function zero. On the basis of the perturbative
theory, in the small external magnetic field we find the diamagnetic
polarizabilities of $\rho$ and $K^*$ mesons: $\beta_\rho =-0.8\times 10^{-4}
{fm}^3$, $\beta_{K^*}=-0.57\times 10^{-4} {fm}^3$


title: Questions of Identity

abstract:
  As an introduction to NuFact '99, the ICFA/ECFA Workshop on Neutrino
Factories Based on Muon Storage Rings, I place the issues of neutrino
properties and neutrino oscillations in the broader context of fermion flavor.


title: Diphoton Signals for Large Extra Dimensions at the Tevatron and CERN LHC

abstract:
  We analyze the potentiality of hadron colliders to search for large extra
dimensions via the production of photon pairs. The virtual exchange of
Kaluza--Klein gravitons can significantly enhance this processes provided the
quantum gravity scale ($M_S$) is in the TeV range. We studied in detail the
subprocesses $q \bar{q} \to \gamma \gamma$ and $g g \to \gamma \gamma$ taking
into account the complete Standard Model and graviton contributions as well as
the unitarity constraints. We show that the Tevatron Run II will be able to
probe $M_S$ up to 1.5--1.9 TeV at 2$\sigma$ level, while the LHC can extend
this search to 5.3--6.7 TeV, depending on the number of extra dimensions.


title: Dissipative phenomena in chemically non-equilibrated quark gluon plasma

abstract:
  The dissipative corrections to the hydrodynamic equations describing the
evolution of energy-momentum tensor and parton densities are derived in a
simple way using the scaling approximation for the expanding quark gluon plasma
at finite baryon density. This procedure has been extended to study the process
of chemical equilibration using a set of rate equations appropriate for a
viscous quark gluon plasma. It is found that in the presence of dissipation,
the temperature of the plasma evolves slower, whereas the quark and gluon
fugacities evolve faster than their counterparts in the ideal case without
viscosity.


title: Mapping the QCD Phase Diagram

abstract:
  I review recent theoretical developments which show how a key qualitative
feature of the QCD phase diagram, namely a critical point which in a sense
defines the landscape which heavy ion collision experiments are seeking to map,
can be discovered. The map of the phase diagram which I sketch is based on
reasonable inference from universality, lattice gauge theory and models; the
discovery of the critical point would provide an experimental foundation for
the central qualitative feature of the landscape. I also review recent progress
in our understanding of cold, dense quark matter, as may occur in the cores of
neutron stars. In this regime, quarks form Cooper pairs. The formation of such
superconducting phases requires only weak attractive interactions, as provided
by one-gluon exchange at asymptotically high density; these phases may
nevertheless break chiral symmetry (by locking flavor symmetries to color
symmetry) and may have excitations which are indistinguishable from those in a
confined phase. Mapping this part of the phase diagram will require a better
understanding of how the presence of color superconductivity and color-flavor
locking affects neutron star phenomenology.


title: Non-singlet splitting functions in QED

abstract:
  Iterative solution of QED evolution equations for non-singlet electron
structure functions is considered. Analytical expressions in the fourth and
fifth orders are presented in terms of splitting functions. Relation to the
existing exponentiated solution is discussed.


title: Two-loop renormalization of the effective field theory of a static quark

abstract:
  We give a recurrence relation for two-loop integrals encountered in the
effective field theory of an infinitely heavy quark, Q, interacting with gluons
and Nl massless quarks, q, from which we obtain exact two-loop results, in any
dimension and covariant gauge, for the propagator of Q and the vertex function
of the heavy-light current J = Q Gamma q, at zero q momentum. The anomalous
dimension of the Q field agrees with the recent result of Broadhurst, Gray and
Schilcher. The anomalous dimension of the current is gamma_J = d log Z_J / d
log mu = - alpha_s/pi (1 + (127 + 56 zeta(2) - 10 Nl)/72) alpha_s/pi +
O(alpha_s^2)) which gives the new two-loop correction to the result of Voloshin
and Shifman.


title:
Operator product expansion in static-quark effective field theory: large
  perturbative correction

abstract:
  We calculate the coefficients of operators with dimensions d <= 7 in the
operator product expansion of correlators of q Gamma Q currents, for the
effective field theory of an infinite-mass quark, Q. Exact two-loop results are
obtained, with an arbitrary gauge group and spacetime dimension, for the
perturbative (d=0) and quark-condensate (d=3) contributions, confirming our
previous result for the anomalous dimension of the current. Leading-order
results are given for light-quark operators with d=5, 6, 7 and gluon operators
with d=4, 6. The existence of a perturbative correction of order 100% precludes
a reliable determination of f_B from non-relativistic sum rules.


title:
Baryonic currents and their correlators in the Heavy Quark Effective
  Theory

abstract:
  HQET currents with the quantum numbers of the ground-state baryons are
discussed. One-loop anomalous dimensions are calculated, and exact one-loop
matching to QCD currents is found. Two-point correlators of these currents are
calculated taking into account $d\le9$ terms of the OPE. Sum rules for heavy
baryons Lambda_Q and Sigma^(*)_Q are analyzed. Three-point correlators of two
baryonic currents and a heavy-heavy velocity changing current are calculated
with the same accuracy. The baryonic Isgur-Wise form factors are estimated from
the corresponding sum rules.


title:
Sum rules for 1/m corrections to the form factors of semileptonic B
  decays

abstract:
  Semileptonic B decays are described by the Isgur-Wise form factor to the
leading order in 1/m; four new functions appear in the first order [Luke].
Values of these functions are crucial for the applicability of the whole
approach to processes involving c quark. We obtain the sum rules for three
subleading form factors from the QCD sum rules with finite masses by expanding
to the first order in 1/m. The results respect the pattern of the first 1/m
corrections established in HQET, and obey the Luke's theorem. The numerical
estimates show that 1/m_c corrections are sizable but not catastrophic.


title: Introduction to the Heavy Quark Effective Theory

abstract:
  Heavy Quark Effective Theory (HQET) is a new approach to QCD problems
involving a heavy quark. In the leading approximation, the heavy quark is
considered as a static source of the gluon field; 1/m corrections can be
systematically included in the perturbation theory. New symmetry properties not
apparent in QCD appear in HQET. They are used, in particular, to obtain
relations among heavy hadron form factors. HQET also simplifies lattice
simulation and sum rules analysis of heavy hadrons.


title:
Summary of activities in the Working Group on QCD Cascades of the HERA
  Monte Carlo workshop

abstract:
  We summarize the activities in working group 10 concerned with QCD cascades,
and find that although much work still needs to be done, much progress was made
during this workshop in understanding the merits and deficiencies of different
programs.


title: The Colour-Dipole model and the Ariadne program at high Q^2

abstract:
  I present a modification of the Colour Dipole Model for DIS as implemented in
Ariadne to better describe events at high Q^2.


title: String thresholds and Renormalisation Group Evolution

abstract:
  We consider the calculation of threshold effects due to Kaluza Klein and
winding modes in string theory. We show that for a large radius of
compactification these effects may be approximated by an effective field theory
applicable below the string cut-off scale. Using this formalism we show that
the radiative contribution to gauge couplings involving only massive Kaluza
Klein and winding modes may be calculated to all orders in perturbation theory
and determine the full two loop contribution involving light modes and estimate
the magnitude of the higher-order contributions. For the case of the weakly
coupled heterotic string we also discuss how an improved calculation can be
made incorporating the string theory threshold corrections which avoids the
limitations of the effective field theory approach. Using this formalism we
determine the implications for gauge coupling unification for one
representative model including the effects of two loop corrections above the
compactification scale. Finally we discuss the prospects for gauge unification
in Type I models with a low string scale and point out potential fine tuning
problems in this case.


title:
A picture of the Yang-Mills deconfinement transition and its lattice
  verification

abstract:
  In the framework of the center vortex picture of confinement, the nature of
the deconfining phase transition is studied. Using recently developed
techniques which allow to associate a center vortex configuration with any
given lattice gauge configuration, it is demonstrated that the confining phase
is a phase in which vortices percolate, whereas the deconfined phase is a phase
in which vortices cease to percolate if one considers an appropriate slice of
space-time.


title:
Connections between epsilon'/epsilon and Rare Kaon Decays in
  Supersymmetry

abstract:
  We analyze the rare kaon decays $K_L \to \pi^0 \nu \bar \nu$, $K^+ \to \pi^+
\nu \bar \nu$, $K_L \to \pi^0 e^+ e^-$ and $K_L \to \mu^+ \mu^-$ in conjunction
with the CP violating ratio $\epsilon'/\epsilon$ in a general class of
supersymmetric models in which $Z$- and magnetic-penguin contributions can be
substantially larger than in the Standard Model. We point out that radiative
effects relate the double left-right mass insertion to the single left-left
one, and that the phenomenological constraints on the latter reflect into a
stringent bound on the supersymmetric contribution to the $Z$ penguin. Using
this bound, and those coming from recent data on $\epsilon'/\epsilon$ we find
${\rm BR}(K_L \to \pi^0 \nu \bar \nu)\lsim 1.2\cdot 10^{-10}$, ${\rm BR}(K^+
\to \pi^+ \nu \bar \nu)\lsim 1.7\cdot 10^{-10}$, ${\rm BR}(K_L \to \pi^0 e^+
e^-)_{\rm dir}\lsim 2.0\cdot 10^{-11}$, assuming the usual determination of the
CKM parameters and neglecting the possibility of cancellations among different
supersymmetric effects in $\epsilon'/\epsilon$. Larger values are possible, in
principle, but rather unlikely. We stress the importance of a measurement of
these three branching ratios, together with improved data and improved theory
of $\epsilon'/\epsilon$, in order to shed light on the realization of various
supersymmetric scenarios. We reemphasize that the most natural enhancement of
$\epsilon'/\epsilon$, within supersymmetric models, comes from chromomagnetic
penguins and show that in this case sizable enhancements of $BR(K_L \to \pi^0
e^+ e^-)_{\rm dir}$ can also be expected.


title: Hard-thermal-loop resummed pressure of a degenerate quark-gluon plasma

abstract:
  We compute the pressure of a finite density quark-gluon plasma at zero
temperature to leading order in hard-thermal-loop perturbation theory, which
includes the fermionic excitations and Landau damping. The result is compared
with the weak-coupling expansion for finite positive chemical potential $\mu$
through order $\alpha_s^2$ and with a quasiparticle model with a mass depending
on $\mu$.


title: CP Violation in the Higgs Sector of the MSSM

abstract:
  Recently, it has been found that the tree-level CP invariance of the Higgs
potential in the MSSM can be sizeably broken by loop effects due to
soft-CP-violating trilinear interactions involving third generation scalar
quarks. These soft-CP-violating couplings may be constrained by considering new
two-loop contributions to the electron and neutron EDMs. The phenomenological
consequences of such a minimal supersymmetric scenario of explicit CP violation
at present and future colliders are briefly discussed.


title: Color Evaporation Induced Rapidity Gaps

abstract:
  We show that soft color rearrangement of final states can account for the
appearance of rapidity gaps between jets. In the color evaporation model the
probability to form a gap is simply determined by the color multiplicity of the
final state. This model has no free parameters and reproduces all data obtained
by the ZEUS, H1, D0, and CDF collaborations.


title:
Quark- and Gluon-Condensate Contributions to Penguin Four-Fermi
  Operators

abstract:
  The nonperturbative content of the QCD vacuum permits the occurrence of
QCD-vaccum condensate contributions to penguin amplitudes. We calculate the
dimension-4 $<m_q\bar qq>$ and $<\alpha_s G^2>$ contributions to the effective
Wilson coefficients for penguin four-Fermi operators, and discuss how such
contributions may contribute to nonleptonic B decays.


title: Dissipation, noise and DCC domain formation

abstract:
  We investigate the effect of friction on domain formation in disoriented
chiral condensate. We solve the equation of motion of the linear sigma model,
in the Hartree approximation, including a friction and a white noise term. For
quenched initial condition, we find that even in presence of noise and
dissipation domain like structure emerges after a few fermi of evolution.
Domain size as large as 5 fm can be formed.


title: Matching Heavy Particle Approach to Relativistic Theory

abstract:
  On the simple model of interacting massless and heavy scalar fields it is
demonstrated that the technique of heavy baryon chiral perturbation theory
reproduces the results of relativistic theory. Explicit calculations are
performed for diagrams including two-loops.


title: Intermediate-Mass Higgs Searches in Weak Boson Fusion

abstract:
  Weak boson fusion is a copious source of intermediate mass Higgs bosons at
the LHC. The additional very energetic forward jets in these events are
powerful background suppression tools. I analyze the decays H -> gamma gamma
and H -> W^(*)W^(*) -> e mu pTmiss, with the latter a potential discovery
channel, and the decay H -> tau tau -> lep had pTmiss as a method for achieving
the first direct measurement of a Higgs-fermion coupling.
  I perform parton level analyses of the signal and dominant backgrounds for
each decay mode, and demonstrate kinematic cuts and other important tools
neccessary to achieve an S/B > 1/1 rate in all cases. I also perform cross
section calculations with additional gluon emission which provide an estimate
of a minijet veto probability.
  I show that a 5 sigma H -> gamma gamma observation can be made for 110 GeV <
M_H < 150 GeV with modest luminosity, order 40-50 fb^-1, overlapping the region
explored by the CERN LEP and Fermilab Tevatron. For 130 GeV < M_H < 200 GeV, I
show that H -> WW can achieve a 5 sigma observation with S/B much greater than
1/1 with extremely low luminosity, about 2-10 fb^-1 over almost the entire
range. This is the most promising search channel in the 130-200 GeV mass range.
It overlaps the H -> gamma gamma region and nicely complements the H -> WW
measurement that can be made with very low luminosity in inclusive gg -> H
production. I further show that a Higgs-fermion coupling can be directly
measured via the H -> tau tau decay with only about 60 fb^-1.


title: Screening Effects on $F_2$ at Low $x$ and $Q^2$

abstract:
  This is a talk given at Ringberg Workshop:"New Trends in HERA Physics", 30
May - 4 June, 1999.In this talk we discuss how deeply the region of high parton
densities has been studied experimentally at HERA. We show that the
measurements of deep inelastic structure functions at HERA confirm our
theoretical expectation that at HERA we face a challenging problem of
understanding a new system of partons: quarks and gluons at short distances
with so large densities that we cannot treat this system perturbatively. We
collect all experimental indications and manifestations of specific properties
of high parton density QCD.


title: Implementing quadratic supergravity inflation

abstract:
  We study inflation driven by a slow-rolling inflaton field, characterised by
a quadratic potential, and incorporating radiative corrections within the
context of supergravity. In this model the energy scale of inflation is not
overly constrained by the requirement of generating the observed level of
density fluctuations and can have a physically interesting value, e.g. the
supersymmetry breaking scale of $10^{10}$ GeV or the electroweak scale of
$10^3$ GeV. In this mass range the inflaton is light enough to be confined at
the origin by thermal effects, naturally generating the initial conditions for
a (last) stage of inflation of the new inflationary type.


title: Large Mixing and CP Violation in Neutrino Oscillations

abstract:
  I introduce a simple phenomenological model of lepton flavor mixing and CP
violation based on the flavor democracy of charged leptons and the mass
degeneracy of neutrinos. The nearly bi-maximal mixing pattern, which can
interpret current data on atmospheric and solar neutrino oscillations, emerges
naturally from this model. The rephasing-invariant strength of CP or T
violation amounts to about one percent and could be measured in the
long-baseline neutrino experiments. The similarity and difference between
lepton and quark flavor mixing phenomena are also discussed.


title: Probing Supersymmetric Flavor Models with $\epsilon'/\epsilon$

abstract:
  We discuss the supersymmetric contribution to $\epsilon'/\epsilon$ in various
supersymmetric flavor models. We find that in alignment models the
supersymmetric contribution could be significant while in heavy squark models
it is expected to be small. The situation is particularly interesting in models
that solve the flavor problems by either of the above mechanisms and the
remaining CP problems by means of approximate CP, that is, all CP violating
phases are small. In such models, the standard model contributions cannot
account for $\epsilon'/\epsilon$ and a failure of the supersymmetric
contributions to do so would exclude the model. In models of alignment and
approximate CP, the supersymmetric contributions can account for
$\epsilon'/\epsilon$ only if both the supersymmetric model parameters and the
hadronic parameters assume rather extreme values. Such models are then strongly
disfavored by the $\epsilon'/\epsilon$ measurements. Models of heavy squarks
and approximate CP are excluded.


title: The reaction e+e- -> t tbar g at next-to-leading order in alpha_s

abstract:
  The production of top quark pairs together with a hard gluon in e+e-
annihilation is studied including next-to-leading order corrections in the
strong coupling.


title: Covariance of Light-Front Models: Pair Current

abstract:
  We compute the "+" component of the electromagnetic current of a composite
spin-one two-fermion system for vanishing momentum transfer component
$q^+=q^0+q^3$. In particular, we extract the nonvanishing pair production
amplitude on the light-front. It is a consequence of the longitudinal zero
momentum mode, contributing to the light-front current in the Breit-frame. The
covariance of the current is violated, if such pair terms are not included in
its matrix elements. We illustrate our discussion with some numerical examples.


title: H^+H^- Pair Production at the Large Hadron Collider

abstract:
  We study the pair production of charged Higgs bosons at the CERN Large Hadron
Collider in the context of the minimal supersymmetric extension of the standard
model. We compare the contributions due to qq-bar annihilation at the tree
level and gg fusion, which proceeds at one loop. At small or large values of
tan(beta), H^+H^- production proceeds dominantly via bb-bar annihilation, due
to Feynman diagrams involving neutral CP-even Higgs bosons and top quarks,
which come in addition to the usually considered Drell-Yan diagrams. In the
case of gg fusion, the squark loop contributions may considerably enhance the
well-known quark loop contributions.


title: Lattice determinations of the strange quark mass

abstract:
  Lattice calculations of the mass of the strange quark are reviewed. In
particular, the reason for the spread in values is explained with emphasis on
the effects that recently implemented improvements have had on the lattice
determinations.


title: Isolated-photon production in polarized pp collisions

abstract:
  We perform a detailed study of the production of isolated prompt photons in
polarized hadronic collisions, in the centre-of-mass energy range relevant to
RHIC. We compare the results obtained for a traditional cone-isolation
prescription, with those obtained by imposing an isolation condition that
eliminates any contribution to the cross section from the fragmentation
mechanism. The latter prescription will allow us to present the first fully
consistent next-to-leading order calculation in polarized prompt-photon
production. We will discuss the theoretical uncertainties affecting the cross
section, addressing the issue of the reliability of the perturbative expansion,
for both inclusive isolated-photon and photon-plus-jet observables. Finally, we
will study the dependence of our predictions upon the polarized parton
densities, and the implications for the measurability of the gluon density.


title:
Initial State Radiation in Simulations of Vector Boson Production at
  Hadron Colliders

abstract:
  The production of vector bosons at present and future hadron colliders will
provide a crucial test for QCD and Standard Model physics. In this paper we
improve parton shower simulations of Drell-Yan processes by implementing
matrix-element corrections to the initial-state radiation. We apply our work to
the HERWIG Monte Carlo event generator and compare our phenomenological results
with the ones obtained using the previous version of HERWIG, with resummed
calculations which we match to the exact first-order perturbative result, and
with recent Tevatron data. We also make some predictions for jet events at the
LHC.


title:
Scaling violations: Connections between elastic and inelastic hadron
  scattering in a geometrical approach

abstract:
  Starting from a short range expansion of the inelastic overlap function,
capable of describing quite well the elastic pp and $\bar{p}p$ scattering data,
we obtain extensions to the inelastic channel, through unitarity and an impact
parameter approach. Based on geometrical arguments we infer some
characteristics of the elementary hadronic process and this allows an excellent
description of the inclusive multiplicity distributions in $pp$ and $\bar{p}p$
collisions. With this approach we quantitatively correlate the violations of
both geometrical and KNO scaling in an analytical way. The physical picture
from both channels is that the geometrical evolution of the hadronic
constituents is principally reponsible for the energy dependence of the
physical quantities rather than the dynamical (elementary) interaction itself.


title: CP-Violating Effects in Neutralino Scattering and Annihilation

abstract:
  We show that in some regions of supersymmetric parameter space, CP violating
effects that mix the CP-even and CP-odd Higgs bosons can enhance the neutralino
annihilation rate, and hence the indirect detection rate of neutralino dark
matter, by factors of 10^6. The same CP violating effects can reduce the
neutralino scattering rate off nucleons, and hence the direct detection rate of
neutralino dark matter, by factors of 10^{-7}. We study the dependence of these
effects on the phase of the trilinear coupling A, and find cases in the region
being probed by dark matter searches which are experimentally excluded when CP
is conserved but are allowed when CP is violated.


title: Minimal Composite Higgs Model with Light Bosons

abstract:
  We analyze a composite Higgs model with the minimal content that allows a
light Standard-Model-like Higgs boson, potentially just above the current LEP
limit. The Higgs boson is a bound state made up of the top quark and a heavy
vector-like quark. The model predicts that only one other bound state may be
lighter than the electroweak scale, namely a CP-odd neutral scalar. Several
other composite scalars are expected to have masses in the TeV range. If the
Higgs decay into a pair of CP-odd scalars is kinematically open, then this
decay mode is dominant, with important implications for Higgs searches. The
lower bound on the CP-odd scalar mass is loose, in some cases as low as $\sim$
100 MeV, being set only by astrophysical constraints.


title:
Hard Rescattering in QCD and High Energy Two-Body Photodisintegration of
  the Deuteron

abstract:
  Photon absorption by a quark in one nucleon followed by its high momentum
transfer interaction with a quark in the other may produce two nucleons with
high relative momentum. We sum the relevant quark rescattering diagrams, to
show that the scattering amplitude depends on a convolution between the large
angle $pn$ scattering amplitude, the hard photon-quark interaction vertex and
the low-momentum deuteron wave function. The computed cross sections are in
reasonable agreement with the data.


title: The Strangeness Magnetic Moment of the Proton in the Chiral Quark Model

abstract:
  The strangeness magnetic moment of the proton is shown to be small in the
chiral quark model. The dominant loop contribution is due to kaons. The K^*
loop contributions are proportional to the difference between the strange and
light constituent quark masses or $m_{K^*}^{-2}$ and therefore small. The loop
fluctuations that involve radiative transitions between K^* mesons and kaons
are small, when the cut-off scale in the loops is taken to be close to the
chiral symmetry restoration scale. The net loop amplitude contribution to the
strangeness magnetic moment of the proton is about -0.05, which falls within
the uncertainty range of the experimental value.


title: The method of expansion of Feynman integrals

abstract:
  The method of expansion of integrals in external parameters is suggested. It
is quite universal and works for Feynman integrals both in Euclidean and
Minkowski regions of momenta.


title: Theoretical Status of epsilon'/epsilon

abstract:
  We review the present theoretical status of the CP violating ratio
epsilon'/epsilon in the Standard Model (SM) and confront its estimates with the
most recent data. In particular we review the present status of the most
important parameters m_s, B_6^(1/2), B_8^(3/2), \Lambda_MSbar and
Omega_{\eta+\eta'}. While the sign and the order of magnitude of SM estimates
for epsilon'/epsilon agree with the data, for central values of these
parameters most estimates of epsilon'/epsilon in the SM are substantially below
the grand experimental average (21.2\pm 4.6)\cdot 10^{-4}. Only in a small
corner of the parameter space can epsilon'/epsilon in SM be made consistent
with experimental results. In view of very large theoretical uncertainties, it
is impossible to conclude at present that the data on epsilon'/epsilon indicate
new physics. A brief discussion of epsilon'/epsilon beyond the Standard Model
is presented.


title: The Small Observed Baryon Asymmetry from a Large Lepton Asymmetry

abstract:
  Primordial Big-Bang Nucleosynthesis (BBN) tightly constrains the existence of
any additional relativistic degrees of freedom at that epoch. However a large
asymmetry in electron neutrino number shifts the chemical equilibrium between
the neutron and proton at neutron freeze-out and allows such additional
particle species. Moreover, the BBN itself may also prefer such an asymmetry to
reconcile predicted element abundances and observations. However, such a large
asymmetry appears to be in conflict with the observed small baryon asymmetry if
they are in sphaleron mediated equilibrium. In this paper we point out the
surprising fact that in the Standard Model, if the asymmetries in the electron
number and the muon number are equal (and opposite) and of the size required to
reconcile BBN theory with observations, a baryon asymmetry of the Universe of
the correct magnitude and sign is automatically generated within a factor of
two. This small remaining discrepancy is naturally remedied in the
supersymmetric Standard Model.


title:
Neutralino-Nucleus Elastic Scattering in the MSSM with Explicit CP
  Violation

abstract:
  We re-investigate the neutralino-nucleus elastic scattering as a promising
dark matter detection mechanism including contributions from the
scalar-pseudoscalar mixing of neutral Higgs states and the induced phase
between two Higgs doublets due to the CP-violating phases of the scalar top and
bottom sectors in the minimal supersymmetric standard model. The spin-dependent
part of the cross section turns out to be hardly affected by the CP-violating
induced phase due to a mutually destructive unavoidable suppression mechanism
of various relevant supersymmetric parameters. On the other hand, although the
phase $\Phi_\mu$ of the higgsino mass parameter is set to be zero, the
spin-independent part, which can dominate over the spin-dependent part for
heavy nuclei, can be strongly dependent on the CP-violating scalar-pseudoscalar
mixing and the induced phase, in particular, for a large $|\mu|$, a small
charged Higgs boson mass, and a large trilinear term $|A|$ compared to the SUSY
breaking scale. For a small $\tan\beta$ and a large $|\mu|$, the
spin-independent cross section is enhanced by an order of magnitude as the
phase $\Phi_A$ of the trilinear term increases up to $\pi$, while for a large
$\tan\beta$ and a large $|\mu|$ the spin-independent cross section is
significantly suppressed for non-zero values of the phase $\Phi_A$.


title:
Cosmological Consequences of Slow-Moving Bubbles in First-Order Phase
  Transitions

abstract:
  In cosmological first-order phase transitions, the progress of true-vacuum
bubbles is expected to be significantly retarded by the interaction between the
bubble wall and the hot plasma. We examine the evolution and collision of
slow-moving true-vacuum bubbles. Our lattice simulations indicate that phase
oscillations, predicted and observed in systems with a local symmetry and with
a global symmetry where the bubbles move at speeds less than the speed of
light, do not occur inside collisions of slow-moving local-symmetry bubbles. We
observe almost instantaneous phase equilibration which would lead to a decrease
in the expected initial defect density, or possibly prevent defects from
forming at all. We illustrate our findings with an example of defect formation
suppressed in slow-moving bubbles. Slow-moving bubble walls also prevent the
formation of `extra defects', and in the presence of plasma conductivity may
lead to an increase in the magnitude of any primordial magnetic field formed.


title: Standard Model vs New Physics in Rare Kaon Decays

abstract:
  We present a brief overview of rare K decays, emphasizing the different role
of Standard Model and possible New Physics contributions in various channels.


title:
$\Delta S=1,2$ Effective Weak Chiral Lagrangian from the Instanton
  Vacuum

abstract:
  We study the effective weak chiral Lagrangian within the framework of the
instanton vacuum. We incorporate the $\Delta S=1,2$ effective weak Hamiltonian
into the effective low-energy QCD partition function defining the chiral
symmetric quark-Goldstone boson interactions with the momentum-dependent
dynamical quark mass. Employing the derivative expansion, we derive the
corresponding weak effective Lagrangian in leading order with the low energy
constants to be used e.g. in chiral perturbation theory. We find that the
momentum-dependent dynamical quark mass plays an essential role in improving
the low energy constants and their ratio $g_{8}/g_{27}$.


title:
Color Screening Effects on Hadronization in Relativistic Heavy Ion
  Collisions

abstract:
  The effects of color screening on the hadronization of a parton plasma into a
hadron gas are examined at the energies of the relativistic heavy ion collider.
It is found to have the tendency to prevent hadronization and therefore
delaying the conversion of the partons into a hadron gas. Because of the
continual expansion, the resulting hadron gas number densities are lower when
screening is included. This should reduce the hadronic noise to genuine signals
of the quark-gluon plasma. In this sense, color screening is favorable and
should be included in numerical models. In any case, we advocate that numerical
models should allow the confining forces and color screening to act on each
other so as to undergo the phase transition in a natural way. Hadronization is
also shown to seriously disrupt parton equilibration and is yet another reason
why full parton chemical equilibration should not be expected.


title: Observability and Probability of Discovery in Future Experiments

abstract:
  We propose a method to estimate the probability of new physics discovery in
future high energy physics experiments. Physics simulation gives both the
average numbers $<N_b>$ of background and $<N_s>$ of signal events. We find
that the proper definition of the significance is $S_{12} = \sqrt{<N_s>+<N_b>}
- \sqrt{<N_b>}$ in comparison with often used significances $S_1 =
\displaystyle \frac{<N_s>}{\sqrt{<N_b>}}$ and $S_2 = \displaystyle
\frac{<N_s>}{\sqrt{<N_s> + <N_b>}}$. We propose a method for taking into
account systematic uncertainties related to nonexact knowledge of background
and signal cross sections. An account of such systematics is very essential in
the search for supersymmetry at LHC. We propose a method for estimation of
exclusion limits on new physics in future experiments. We also estimate the
probability of new physics discovery in future experiments taking into account
systematical errors.


title: Preheating and Supergravity

abstract:
  In this talk recent developments of the theory of preheating after inflation
are briefly reviewed. In inflationary cosmology, the particles constituting the
Universe are created after inflation due to their interaction with moving
inflaton field(s) in the process of reheating. In inflationary models motivated
by supergravity, both bosons and fermions are created. In the bosonic sector,
the leading channel of particle production is the non-perturbative regime of
parametric resonance dominated by those bosons which are created exponentially
fast with the largest characteristic exponent. In the fermionic sector, the
leading channel corresponds to the regime of parametric excitation of fermions,
which respects Pauli blocking but differs significantly from the perturbative
expectation. In supergravity we also have to consider production of gravitinos
and moduli fields, which are cosmologically dangerous relics. We discuss the
derivation of the gravitino equations in curved space-time with moving
background scalars. We describe recent results on the production of gravitinos
from preheating, which may put strong constraints on the inflationary models.


title: Large Delta(I)=3/2 Contribution to epsilon'/epsilon in Supersymmetry

abstract:
  We show that in supersymmetric extensions of the Standard Model gluino box
diagrams can yield a large Delta(I)=3/2 contribution to s->d+q(bar)+q FCNC
processes, which may induce a sizable CP-violating contribution to the I=2
isospin amplitude in K->pi+pi decays. This contribution only requires moderate
mass splitting between the right-handed up- and down-squarks, and persists for
squark masses of order 1 TeV. Taking into account current bounds on
Im(delta_{sd}^{LL}) from K-K(bar) mixing, the resulting contribution to
epsilon'/epsilon could be an order of magnitude larger than the measured value.


title: $B_c$ meson production at the Tevatron Revisited

abstract:
  CDF recently measured the quantity $\frac{\sigma(B_c^+)}{\sigma(B^+)}
\frac{{\rm BR}(B_c^+ \to J/\psi \ell^+ \nu)}{{\rm BR}(B^+ \to J/\psi K^+)}$,
{}from which we determine the ratio $\frac{\sigma(B_c^+)}{\sigma(\bar b)}$ to
be $(2.08\err{1.06}{0.95})\times 10^{-3}$. In this note, we show that the ratio
$\frac{\sigma(B_c^+)}{\sigma(\bar b)}$ obtained by dividing the $\sigma(B_c^+)$
by the leading order $\sigma(\bar b)$ is consistent with this derived CDF
measurement. We calculate the cross section $\sigma(B_c^+)$ using the
perturbative QCD fragmentation functions of Braaten, Cheung, and Yuan and the
corresponding induced gluon fragmentation functions, with the charm-quark mass
$m_c$ as a parameter. We also estimate the parameter $m_c$ from the CDF data
and then predict the production rate at RunII.


title: Lepton Flavor Violation in SUSY models with U(1)-textures

abstract:
  U(1)-family symmetries have led to successful predictions of the fermion mass
spectrum and the mixing angles of the hadronic sector. In the context of the
supersymmetric unified theories, they further imply a non-trivial mass
structure for the scalar partners, giving rise to new sources of flavour
violation. While tau->mu gamma decays are mostly expected to arise at rates
significantly smaller than the current experimental limits, the mu -> e gamma
rare decays impose important bounds on the model parameters. Even if universal
soft-terms are assumed at the GUT scale, when massive neutrinos are included in
these theories, new mixings appear in the soft-terms. The predicted branching
ratios for rare decays are in this case below the experimental bounds.


title: The Color Evaporation Model in Diffractive $J/\psi$ Photoproduction

abstract:
  Our goal is the study of color effects on the $J/\psi$ and $D$ mesons
production, as well as the study of their elastic production. We use the Color
Evaporation Model (CEM), where a single factor takes into account the
probability that the $c\bar{c}$ produced in a color octet state turns into a
physical (colorless) quarkonium or continues as a color octet, producing open
charm.
  The main result of this work, besides investigating the range of
applicability of the CEM, is to show that this model can be used to describe
the elastic processes of $J/\psi$ and open charm photoproduction without the
use of a Pomeron.


title: QCD Interconnection Effects

abstract:
  Heavy objects like the W, Z and t are short-lived compared with typical
hadronization times. When pairs of such particles are produced, the subsequent
hadronic decay systems may therefore become interconnected. We study such
potential effects at Linear Collider energies.


title:
Strongly Interacting Vector Bosons at TeV e+-e- Linear Colliders
  -Addendum-

abstract:
  Extending earlier investigations, we analyze the quasi-elastic scattering of
strongly interacting electroweak bosons at high-energy e+-e- colliders. The
three processes e+e- -> bar-nu nu W+W-, bar-nu nu ZZ, and e-e- -> W-W- are
examined at a c.m. energy of 1 TeV for high-luminosity runs. The expected
experimental error on the scattering amplitude, parameter-free to leading order
in the chiral expansion of the WW interactions, is estimated for 1 TeV
colliders at the level of ten percent, providing a stringent test of strong
interaction mechanisms for breaking the electroweak symmetries.


title:
Pair production and solutions of the wave equation for particles with
  arbitrary spin

abstract:
  We investigate the theory of particles with arbitrary spin and anomalous
magnetic moment in the Lorentz representation (0,s)X(s,0), in an external
constant and uniform electromagnetic field. We obtain the density matrix of
free particles in pure spin states. The differential probability of pair
producing particles with arbitrary spin by an external constant uniform
electromagnetic field has been found using the exact solutions. We have
calculated the imaginary and real parts of the Lagrangian in an electromagnetic
field that takes into account vacuum polarization.


title: Factorization of Twist-Four Gluon Operator Contributions

abstract:
  We consider diagrams with up to four t-channel gluons in order to specify
gluonic twist-four contributions to deep inelastic structure functions. This
enables us to extend the method developed by R.K.Ellis, W.Furmanski, and
R.Petronzio (EFP) to the gluonic case. The method is based on low-order Feynman
diagrams in combination with a dimensional analysis. It results in explicitly
gauge invariant expressions for the factorization of twist-four gluon-operator
matrix elements and the corresponding coefficient functions.


title: Sum rules for the T-odd fragmentation functions

abstract:
  The conservation of the intrinsic transverse momentum during parton
fragmentation imposes non-trivial constraints on T-odd fragmentation functions.
These significantly enhance the differences between the favoured and unfavoured
fragmentation functions, which could be relevant to understand the azimuthal
asymmetries of charged pion production observed recently by the HERMES
collaboration.


title: Gamma*Gamma* Reactions at High Energies

abstract:
  The total hadronic gamma*gamma* cross sections at high energy are calculated
as a function of energy and photon virtuality in a model combining Regge
exchange, the quark box diagram (a fixed pole in Regge language) and soft and
hard pomeron exchanges evaluated in the context of dipole-dipole scattering.
Good agreement is obtained with the data for the real gamma-gamma cross section
and for the real photon structure function. However the model prediction for
the gamma* gamma* cross section is too small. This is attributed to an
incorrect extrapolation of the Q^2 dependence of the hard pomeron adopted here.
Parametrising it independently shows that the hard part of the cross section
can be well represented by a simple Regge pole with intercept ~ 1.3.


title: Radiative Weak Annihilation Decays

abstract:
  A class of meson decay modes sensitive to only one quark topology at leading
G_F order (annihilation of valence quarks through a W) is described. No
experimental observations, nor even upper limits, have been reported for these
decays. This work presents a simpleminded (order-of-magnitude) calculation of
their branching fractions, and compares to results of previous calculations
where available. Although rare, one of these modes (D_s^+ --> rho^+ gamma)
might already be observable at charm experiments, two others (D^+ --> K^{*+}
gamma, B^+ --> D_s^{*+} gamma) should appear at the B factories, and the rest
at hadron colliders.


title:
Supersymmetric contributions to direct CP violation in K -> pi pi gamma
  decays

abstract:
  We analyze the supersymmetric contributions to direct-CP-violating
observables in $K \to \pi\pi\gamma$ decays induced by gluino-mediated
magnetic-penguin operators. We find that $\epsp_{+-\gamma}$ and the
differential width asymmetry of $K^\pm \to \pi^\pm \pi^0 \gamma$ decays could
be substantially enhanced with respect to their Standard Model values,
especially in the scenario where $\epsp/\eps$ is dominated by supersymmetric
contributions. These observables could therefore provide a useful tool to
search for New Physics effects in $|\Delta S|=1$ transitions, complementary to
$\epsp/\eps$ and rare decays.


title: The Dirac Sea Contribution To The Energy Of An Electroweak String

abstract:
  We present a systematic determination of the order hbar fermionic energy
shift when an electroweak string is perturbed. We show that the combined effect
of zero modes, bound states and continuum states is to lower the total
fermionic ground state energy of the string when the Higgs instability of the
string is excited. The effect of the Dirac sea is thus to destabilise the
string. However, this effect can be offset by populating positive energy
states. Fermions enhance the stability of an electroweak string with
sufficiently populated fermionic bound states.


title: Leptogenesis with Heavy Majorana Neutrinos Reexamined

abstract:
  The mass term for Majorana neutrinos explicitly violates lepton number.
Several authors have used this fact to create a lepton asymmetry in the
universe by considering CP violating effects in the one loop self-energy
correction for the decaying heavy Majorana neutrino. We compare and comment on
the different approaches used to calculate the lepton asymmetry including those
using an effective Hamiltonian and resummed propagators. We also recalculate
the asymmetry in the small mass difference limit.


title: Bag Models with Fuzzy Boundaries

abstract:
  We discuss how hadronic bag models can be generalized in the framework of
fuzzy set theory to implement effects of a smooth and extended phase boundary.


title: Yukawa couplings and proton decay in SUSY models

abstract:
  We discuss proton decay induced by dimension--5 operators in supersymmetric
models containing extra hypercharge-1/3 color-triplets. We derive a general
formula relating dimension-5 operator to the color-triplet mass matrix. We show
that certain zeros in the triplet mass-matrix together with some triplet
coupling selection rules can lead to elimination of dimension-5 operators. We
apply this mechanism to SU(5) and flipped SU(5) theories with extended Higgs
sectors.


title:
Testing the direct CP violation of the Standard Model without knowing
  strong phases

abstract:
  Reference to recent papers and experimental feasibility are added. The paper
will not be published in a hard-copy journal.


title: Baryogenesis and Low Energy CP Violation

abstract:
  CP violation is a crucial component in the creation of the matter - anti
matter asymmetry of the universe. An important open question is whether the CP
violating phenomena observeable in terrestrial experiments have any relation
with those responsible for baryogenesis. We discuss two mechanisms of
baryogenesis where this question can be meaningfully posed: ``electroweak
baryogenesis'' and ``baryogenesis via leptogenesis''. We show how these
scenarios can be constrained by existing and forthcoming experimental data. We
present a specific example of both these scenarios where the CP violating phase
in the Cabbibo Kobayashi Maskawa matrix is related in a calculable way to the
CP violating phase responsible for baryogenesis.


title:
Event generator for the single- and double-photon emission associated
  with neutrino pair-production

abstract:
  A new event generator is proposed for two processes e+e- -> nu nu-bar gamma
and e+e- -> nu nu-bar gamma gamma where nu includes all the neutrino species.
The exact matrix elements of single- and double-photon emission, generated by
the GRACE system, are convoluted with the QED parton shower(QEDPS) to deal with
the initial state radiations(ISR). It is pointed out that a careful treatment
is required to avoid the double counting of the radiative photons between the
matrix elements and the ISR part. A detailed comparison of grc-nu-nu-gamma with
the O(alpha) calculations and other similar Monte Carlo generators is discussed
on the total cross section and on various distributions. It is also examined
how the possible effects of the anomalous triple-gauge-boson couplings can be
observed.


title: Origins of the baryon spectrum

abstract:
  I begin with a key problem of light and strange baryon spectroscopy which
suggests a clue for our understanding of underlying dynamics. Then I discuss
spontaneous breaking of chiral symmetry in QCD, which implies that at low
momenta there must be quasiparticles - constituent quarks with dynamical mass,
which should be coupled to other quasiparticles - Goldstone bosons. Then it is
natural to assume that in the low-energy regime the underlying dynamics in
baryons is due to Goldstone boson exchange (GBE) between constituent quarks.
Using as a prototype of the microscopical quark-gluon degrees of freedom the
instanton-induced 't Hooft interaction I show why the GBE is so important. When
the 't Hooft interaction is iterated in the qq t-channel it inevitably leads to
a pole which corresponds to GBE. This is a typical antiscreening behavior: the
interaction is represented by a bare vertex at large momenta, but it blows up
at small momenta in the channel with GBE quantum numbers, explaining thus a
distinguished role of the latter interaction in the low-energy regime. I show
how the explicitly flavour-dependent short-range part of the GBE interaction
between quarks, perhaps in combination with the vector-meson exchange
interaction, solves a key problem of baryon spectroscopy and present spectra
obtained in a simple analytical calculation as well as in exact
semirelativistic three-body approach.


title:
Transverse Spin in QCD and Transverse Polarized Deep Inelastic
  Scattering

abstract:
  We address the long standing problem of the construction of relativistic spin
operators for a composite system in QCD. Exploiting the kinematical boost
symmetry in light front theory, we show that transverse spin operators for
massless particles can be introduced in an arbitrary reference frame, in
analogy with those for massive particles. In light front QCD, the complete set
of transverse spin operators are identified for the first time, which are
responsible for the helicity flip of the nucleon. We establish the direct
connection between transverse spin in light front QCD and transverse polarized
deep inelastic scattering. We discuss the theoretical and phenomenological
implications of our results.


title:
Do we expect light flavor sea-quark asymmetry also for the
  spin-dependent distribution functions of the nucleon?

abstract:
  After taking account of the scale dependence by means of the standard DGLAP
evolution equation, the theoretical predictions of the chiral quark soliton
model for the unpolarized and longitudinally polarized structure functions of
the nucleon are compared with the recent high energy data. The theory is shown
to explain all the qualitative features of the experiments, including the NMC
data for $F_2^p (x) - F_2^n (x)$, $F_2^n (x) / F_2^p (x)$, the Hermes and NuSea
data for $\bar{d}(x) - \bar{u}(x)$, the EMC and SMC data for $g_1^p(x)$,
$g_1^n(x)$ and $g_1^d(x)$. Among others, flavor asymmetry of the longitudinally
polarized sea-quark distributions is a remarkable prediction of this model,
i.e., it predicts that $\Delta \bar{d}(x) - \Delta \bar{u}(x) = C x^{\alpha} [
\bar{d}(x) - \bar{u}(x)]$ with a sizable negative coefficient $C \simeq -2.0$
(and $\alpha \simeq 0.12$) in qualitative consistency with the recent
semi-phenomenological analysis by Morii and Yamanishi.


title:
Violation of Time Reversal Invariance in the Decays K_L -> pi^+ pi^-
  gamma and K_L -> pi^+ pi^- e^+ e^-

abstract:
  The origin of the large CP-odd and T-odd asymmetry observed in the decay K_L
-> pi^+ pi^- e^+ e^- is traced to the polarization properties of the photon in
the decay K_L -> pi^+ pi^- gamma. The Stokes vector of the photon S = (S_1,
S_2, S_3) is studied as a function of the photon energy and found to possess
CP-violating components S_1 and S_2 which are sizeable over a large part of the
phase space, despite being proportional to the epsilon parameter of the K_L
wave function. The component S_2 is T-even and manifests itself as a circular
polarization of the photon, while S_1 is T-odd and gives rise to the asymmetry
observed in K_L -> pi^+ pi^- e^+ e^-. The latter is shown to survive in the
``hermitian'' limit in which all unitarity phases are absent, and represents a
genuine example of time reversal symmetry breaking in a CPT invariant theory.


title: SUSY spectrum constraints on direct dark matter detection

abstract:
  We perform an investigation of the MSSM parameter space at the Fermi scale
taking into account available accelerator, non-accelerator and cosmological
constraints. Extra assumptions about upper bounds for some of the SUSY
particles are also imposed. We show that a non-observation of the SUSY dark
matter candidates with a high-accuracy dark matter detector, such as Ge-73,
under above-mentioned assumptions can exclude large domains of the MSSM
parameter space and, for instance, can make especially desirable collider
search for light SUSY charged Higgs boson.


title:
Non-factorizable contribution in nonleptonic weak interactions of K
  mesons

abstract:
  Two pion decays of K mesons, K_L-K_S mass difference, two photon and the
Dalitz decays of K_L are studied systematically by assuming that their
amplitude is given by a sum of factorizable and non-factorizable ones. The
former is estimated by using a naive factorization while the latter is assumed
to be dominated by dynamical contributions of various hadron states.


title: The effect of Majorana phase in degenerate neutrinos

abstract:
  There are physical Majorana phases in the lepton flavor mixing matrix when
neutrinos are Majorana fermions. In the case of two degenerate neutrinos, the
physical Majorana phase plays the crucial role for the stability of the maximal
flavor mixing between the second and the third generations against quantum
corrections. The physical Majorana phase of $\pi$ guarantees the maximal mixing
to be stable against quantum corrections, while the Majorana phase of zero lets
the maximal mixing be spoiled by quantum corrections when neutrino masses are
of O(eV). The continuous change of the Majorana phase from $\pi$ to 0 makes the
maximal mixing be spoiled by quantum corrections with O(eV) degenerate neutrino
masses. On the other hand, when there is the large mass hierarchy between
neutrinos, the maximal flavor mixing is not spoiled by quantum corrections
independently of the Majorana phase.


title:
Exploring Timelike Region of QCD Exclusive Processes in Relativistic
  Quark Model

abstract:
  We investigate the form factors and decay rates of exclusive $0^{-}\to0^{-}$
semileptonic meson decays using the constituent quark model based on the
light-front quantization. Our model is constrained by the variational principle
for the linear plus Coulomb interaction motivated by QCD. Our numerical results
are in a good agreement with the available experimental data.


title:
Light-front quark model predictions of meson elastic and transition form
  factors

abstract:
  We investigate the electroweak form factors and semileptonic decay rates of
mesons using the constituent quark model based on the light-front degrees of
freedom. Our results demonstrate the broader applicability of light-front
approach including the timelike region of exclusive processes.


title: |Vcb| and |Vub| from B Decays: Recent Progress and Limitations

abstract:
  The determination of |Vcb| and |Vub| from semileptonic B decay is reviewed
with a critical discussion of the theoretical uncertainties. Future prospects
and limitations are also discussed.


title:
ZFITTER v.6.21 - A Semi-Analytical Program for Fermion Pair Production
  in e+e- Annihilation

abstract:
  We describe ZFITTER, a Fortran program based on a semi-analytical approach to
fermion pair production in e+e- annihilation at a wide range of centre-of-mass
energies, including the PETRA, TRISTAN, LEP1/SLC, and LEP2 energies. A flexible
treatment of complete O(alpha) QED corrections and of some higher order
contributions is made possible with three calculational chains containing
different realistic sets of restrictions in the photon phase space. Numerical
integrations are at most one-dimensional. Complete O(alpha) weak loop
corrections supplemented by selected higher-order terms may be included. The
program calculates Delta r, the Z width, differential cross-sections, total
cross-sections, integrated forward-backward asymmetries, left-right
asymmetries, and for tau pair production also final-state polarization effects.
Various interfaces allow fits to be performed with different sets of free
parameters.


title:
Flavour symmetry as a Spontaneously Broken Discrete Permutation Symmetry
  Embedded in Colour

abstract:
  A new mechanism for breaking an internal symmetry spontaneously is discussed,
which is intermediate between the Nambu-Goldstone and Wigner modes of symmetry
breaking. Here the quark-antiquark sea takes the role of the vacuum of the
Nambu-Goldstone case. Flavour symmetry becomes a discrete permutation symmetry
of the valence quarks with respect to the sea quarks, which can be
spontaneously broken without generation of massless Goldstone bosons.


title:
Hierarchical Quark Mixing and Bimaximal Lepton Mixing on the Same
  Footing

abstract:
  We show that not only the hierarchical quark CKM mixing matrix but also the
"bimaximal" lepton flavor mixing matrix can be derived from the same mass
matrix ansatz based on the broken permutation symmetry, by assuming the
hierarchy of neutrino masses to be $m_1\simeq m_2 <<m_3$. We also reproduce the
recently measured angle of unitary triangle, $\sin 2\beta$, as well as all the
observed experimental values of $V_{{\tiny CKM}}$ of the quark CKM matrix. And
we predict Jarlskog rephasing invariant quantity, $J_{{\tiny CP}} \simeq 0.18
\times 10^{-4}$, and the upper bound of the same quantity in the lepton sector,
$J^l_{{\tiny CP}} \leq 0.012$, which may be indeed large enough to generate the
lepton number violation of the universe.


title: SO(3) Gauge model for neutrino masses and oscillations

abstract:
  I mainly describe neutrino masses and oscillations in the gauge model with
$SO(3)_{F}$ lepton flavor symmetry and with two Higgs triplets. It is shown how
the maximal mixing between $\nu_{\mu}$ and $\nu_{\tau}$ neutrinos comes out
naturally after spontaneous breaking of the symmetry. The nearly two-flavor
mixing scenario is resulted naturally from an approximate permutation symmetry
between the two Higgs triplets. The hierarchy between the neutrino mass-squared
differences, which is needed for reconciling both solar and atmospheric
neutrino data, leads to an almost maximal mixing between $\nu_{e}$ and
$\nu_{\mu}$ neutrinos. Thus the model favors the intriguing bi-maximal mixing
scenario.The three Majorana neutrino masses are allowed to be nearly degenerate
and large enough to play a significant cosmological role. The model can also
lead to interesting phenomena on lepton-flavor violations via the $SO(3)_{F}$
gauge interactions.


title: Spin and total angular momentum of the glue

abstract:
  We briefly review the present theoretical and experimental knowledge on
Delta_g and J_g.


title: Evaluating Real Time Finite Temperature Feynman Amplitudes

abstract:
  We construct a program to calculate Feynman amplitudes at finite temperature
in the real time Keldysh formalism using the symbolic manipulation program {\it
Mathematica}. As an example, the usefulness of this program is demonstrated by
proving the finite temperature Ward identity for QED in a second order
effective theory.


title: Muonium Decay

abstract:
  Modifications of the mu+ lifetime in matter due to muonium (M = mu+ e-)
formation and other medium effects are examined. Muonium and free mu+ decay
spectra are found to differ at O(alpha m_e/m_mu) from Doppler broadening and
O(alpha^2 m_e/m_mu) from the Coulomb bound state potential. However, both types
of corrections are shown to cancel in the total decay rate due to Lorentz and
gauge invariance respectively, leaving a very small time dilation lifetime
difference, (tau_M - tau_mu+)/tau_mu+ = alpha^2 m_e^2/ 2m_mu^2 \simeq 6\times
10^-10, as the dominant bound state effect. It is argued that other medium
effects on the stopped mu+ lifetime are similarly suppressed.


title: Prospects of calculating $\epsilon_K$ and $\epsilon'$ from lattice QCD

abstract:
  An overview of lattice results for the strange quark mass, $B_K$, $B_6$,
$B_7$, and $B_8$ is presented. I give my assessment of the reliability of
various estimates and prospects for future improvements.


title: On exact solutions of the equation for a pion in external fields III

abstract:
  The exact solutions of the equation for a composite scalar particle which
possesses electric and magnetic polarizabilities are found in an external
uniform static magnetic field parallel to the direction of propagation of the
quantized electromagnetic wave. As a particular case, the relativistic coherent
states of a particle in the field of photons were considered. When the average
photon number trends to infinity, the solution tends to the solution
corresponding to the external classical electromagnetic wave with circular
polarization.


title: Can epsilon'/epsilon be supersymmetric?

abstract:
  I first motivate why we may want to look at possible new physics
contributions to epsilon' given relatively clear experimental but unclear
theoretical situations. I reexamine the supersymmetric contribution to epsilon'
and find an important one generally missed in the literature. Based on rather
model-independent arguments based on flavor symmetries, an estimate of the
possible supersymmetric epsilon' is given, which interestingly come around the
reported values without fine-tuning. If the observed values are dominated by
supersymmetry, it is likely to give interesting consequences on hyperon CP
violation, mu --> e+gamma, and neutron and electron electric dipole moments.


title: Effects of Large CP violating phases on $g_{\m}-2$ in MSSM

abstract:
  Effects of CP violation on the supersymmetric electro-weak correction to the
anomalous magnetic moment of the muon are investigated with the most general
allowed set of CP violating phases in MSSM. The analysis includes contributions
from the chargino and the neutralino exchanges to the muon anomaly. The
supersymmetric contributions depend only on specific combinations of CP phases.
The independent set of such phases is classified. We analyse the effects of the
phases under the EDM constraints and show that large CP violating phases can
drastically affect the magnitude of the supersymmetric electro-weak
contribution to $a_{\mu}$ and may even affect its overall sign.


title: Gauge string in the fermion asymmetric matter

abstract:
  Two new effects of interaction of the gauge string with a homogeneous density
of fermions are considered in a gauge model with an anomalous coupling of
vector fields with fermions. First, the presence of an induced nonzero
magnetic-like helicity on the straight string is demonstrated. Second, it is
shown that the equation of motion of the string is modified by a nonlinear term
that can be decomposed into the correction to the string tension and an
additional force perpendicular to the tangent and normal vectors of the string.
Static configurations are found and their stability is studied.


title:
Quantum analysis of Rydberg atom cavity detector for dark matter axion
  search

abstract:
  Quantum calculations are developed on the dynamical system consisting of the
cosmic axions, photons and Rydberg atoms which are interacting in the resonant
microwave cavity. The time evolution is determined for the number of Rydberg
atoms in the upper state which are excited by absorbing the axion-converted and
thermal background photons. The calculations are made, in particular, by taking
into account the actual experimental situation such as the motion and uniform
distribution of the Rydberg atoms in the incident beam and also the spatial
variation of the electric field in the cavity. Some essential aspects on the
axion-photon-atom interaction in the resonant cavity are clarified by these
detailed calculations. Then, by using these results the detection sensitivity
of the Rydberg atom cavity detector is estimated properly. This systematic
quantum analysis enables us to provide the optimum experimental setup for the
dark matter axion search with Rydberg atom cavity detector.


title: Analytical and numerical properties of Q-balls

abstract:
  Stable non-topological solitons, Q-balls, are studied using analytical and
numerical methods. Three different physically interesting potentials that
support Q-ball solutions are considered: two typical polynomial potentials and
a logarithmic potential inspired by supersymmetry. It is shown that Q-balls in
these potentials exhibit different properties in the thick-wall limit where the
charge of a Q-ball is typically considerably smaller than in the thin-wall
limit. Analytical criteria are derived to check whether stable Q-balls exists
in the thick-wall limit for typical potentials. Q-ball charge, energy and
profiles are presented for each potential studied. Evaporation rates are
calculated in the perfect thin-wall limit and for realistic Q-ball profiles. It
is shown that in each case the evaporation rate increases with decreasing
charge.


title:
Effects of the $K^+\to\pi^+\nu\bar{\nu}$ and of other processes on the
  mixing hierarchies in the four-generation model

abstract:
  We analyze in the four-generation model the first measurement of the
branching ratio of rare kaon decay $K^+\to\pi^+\nu\bar{nu}$, along with the
other processes of $K_L-K_S$ mass difference $\Delta m_K$, CP-violating
parameter $\epsilon_K, B_d-\bar{B_d}$ mixing, $B_s-\bar{B_s}$ mixing,
$B(K_L\to\mu\bar{\mu})$, and the upper bound values of $D^0-\bar{D^0}$ mixing
and $B(K_L\to\pi^0\nu\bar{\nu})$, and try to search for mixing of the fourth
generation in the hierarchical mixing scheme of the Wolfenstein
parametrization. Using the results for the mixing of the fourth generation, we
discuss predictions of the $D^0-\bar{D^0}$ mixing ($\Delta m_D$) and the
branching ratio of directly CP-violating decay process
$K_L\to\pi^0\nu\bar{\nu}$, and the effects on the CP asymmetry in neutral B
meson decays and the unitarity triangle.


title:
Production of Low Mass Electron Pairs Due to the Photon-Photon Mechanism
  in Central Collisions

abstract:
  We calculate the probability for dilepton production in central relativistic
heavy ion collisions due to the gamma-gamma mechanism. This is a potential
background to more interesting mechanisms. We find that this mechanism is
negligible in the CERES experiments. Generally, the contribution due to this
mechanism is small in the central region, while it can be large for small
invariant masses and forward or backward rapidities. A simple formula based on
the equivalent photon approximation and applications to a possible scenario at
RHIC are also given.


title:
Comment on the Baier-Katkov Quasiclassical Operator Approach to the
  Landau-Pomeranchuk-Migdal Effect

abstract:
  I demonstrate that the Baier-Katkov approach to the Landau-Pomeranchuk-Migdal
effect based on their quasiclassical operator method is conceptually wrong in
quantum regime of interaction of the charged particles with the medium
constituents which takes place for electrons and positrons in real media.


title: Limits on Neutrino Mass from Cosmic Structure Formation

abstract:
  We consider the effect of three species of neutrinos with nearly degenerate
mass on the cosmic structure formation in a low matter-density universe within
a hierarchical clustering scenario with a flat initial perturbation spectrum.
The matching condition for fluctuation powers at the COBE scale and at the
cluster scale leads to a strong upper limit on neutrino mass. For a flat
universe with matter density parameter Omega=0.3, we obtain m_nu<0.6eV for the
Hubble constant H_0<80km/s/Mpc. Allowing for the more generous parameter space
limited by Omega<0.4, H_0<80km/s/Mpc and age t_0>11.5Gyr, the limit is 0.9eV.


title: On SUSY inspired minimal lepton number violation

abstract:
  A minimal lepton number violation (LNV) is proposed which could naturally
appear in SUSY theories, if Yukawa and LNV couplings had a common origin.
According to this idea properly implemented into MSSM with an additional
abelian flavor symmetry the prototype LNV appears due to a mixing of leptons
with superheavy Higgs doublet mediating Yukawa couplings. As a result, all
significant physical manifestations of LNV reduce to those of the effective
trilinear couplings $LL\bar{E}$ and $LQ\bar{D}$ aligned, by size and
orientation in a flavor space, with the down fermion (charged lepton and down
quark) effective Yukawa couplings, while the effective bilinear terms appear
generically suppressed relative to an ordinary $\mu $-term of MSSM. Detailed
phenomenology of the model related to the flavor-changing processes both in
quark and lepton sectors, radiatively induced neutrino masses and decays of the
LSP is presented. Remarkably, the model can straightforwardly be extended to a
Grand Unified framework and an explicit example with SU(7) GUT is thoroughly
discussed.


title: Hyperon-nucleon coupling from QCD sum rules

abstract:
  The NKY coupling constant for $Y = \Lambda$ and $\Sigma$ is evaluated in a
QCD sum rule calculation. We discuss and extend the result of a previous
analysis in the $\rlap{/}{q}i\gamma_5$ structure and compare it with the result
obtained with the use of the $\gamma_5 \sigma_{\mu \nu}$ structure. We find a
huge violation of the SU(3) symmetry in the $\gamma_5 \sigma_{\mu \nu}$
structure.


title: Spin Dependence of Diffractive Vector Meson Production

abstract:
  I review the recent progress in the theory of s-channel helicity
nonconservation (SCHNC) effects in diffractive DIS. SCHNC in diffractive vector
meson production is an unique probe of the spin-orbit coupling and Fermi motion
of quarks in vector mesons. Photo- and electroproduction of the $\phi$ and its
radial and angular excitations at Jlab is perfectly posed to probe SCHNC in QCD
pomeron exchange. I also discuss the unitarity driven demise of the
Burkhardt-Cottingham sum rule and large & scaling departure from the
Wandzura-Wilczek relation.


title: Unitarity Corrections in High Energy QCD

abstract:
  The high energy limit of QCD is investigated in the generalized leading
logarithmic approximation. We study unitarity corrections to the BFKL Pomeron
containing t-channel states with up to six gluons. Special attention is given
to the field theory structure of the corresponding multi-gluon amplitudes. We
discuss the transition from two to six gluons in the t-channel.