title: Physics Opportunities at a Photon-Photon Collider

abstract:
  The advent of back-scattered laser beams for electron-positron colliders will
allow detailed studies of a large array of high energy photon-photon and
photon-electron collision processes with polarized beams. These include tests
of electroweak theory in photon-photon annihilation such as $\gamma \gamma \to
W^+ W^-$, $\gamma \gamma \to $ Higgs bosons, and higher-order loop processes,
such as $\gamma \gamma \to \gamma \gamma, Z \gamma, H^0 Z^0$ and $Z Z.$ Methods
for measuring the anomalous magnetic and quadrupole moments of the $W$ and $Z$
gauge bosons to high precision in polarized electron-photon and photon-photon
collisions are discussed. Since each photon can be resolved into a $W^+ W^-$
pair, high energy photon-photon collisions can also provide a remarkably
background-free laboratory for studying $W W$ collisions and annihilation. I
also review high energy $\gamma \gamma$ and $e \gamma$ tests of quantum
chromodynamics, including the production of two gluon jets in photon-photon
collisions, deeply virtual Compton scattering on a photon target, and
leading-twist single-spin asymmetries for a photon polarized normal to a
production plane. Exclusive hadron production processes in photon-photon
collisions provide important tests of QCD at the amplitude level, particularly
as measures of hadron distribution amplitudes which are also important for the
analysis of exclusive semi-leptonic and two-body hadronic B-decays.


title: B=3 Tetrahedrally Symmetric Solitons in the Chiral Quark Soliton Model

abstract:
  In this paper, B=3 soliton solutions with tetrahedral symmetry are obtained
numerically in the chiral quark soliton model using the rational map ansatz.
The solution exhibits a triply degenerate bound spectrum of the quark orbits in
the background of tetrahedrally symmetric pion field configuration. The
corresponding baryon density is tetrahedral in shape. Our numerical technique
is independent on the baryon number and its application to $B \geq 4$ is
straightforward.


title: Low-Energy Quantum Effective Action for Relativistic Superfluids

abstract:
  We consider relativistic superfluids where the U(1) baryon symmetry is
spontaneously broken. Using the formalism of the quantum effective action, we
show that the low-energy dynamics of the superfluid Goldstone boson is
completely determined by the equation of state. Applying the general formalism
to asymptotically high densities, we find the effective action for the
superfluid Goldstone field to leading order in alpha_s, and show that terms
containing fifth and higher powers of the Goldstone boson appear only at the
alpha_s^2 level with known coefficients.


title: Supersymmetric Higgs Boson Decays in the MSSM with Explicit CP Violation

abstract:
  Decays into neutralinos and charginos are among the most accessible
supersymmetric decay modes of Higgs particles in most supersymmetric extensions
of the Standard Model. In the presence of explicitly CP--violating phases in
the soft breaking sector of the theory, the couplings of Higgs bosons to
charginos and neutralinos are in general complex. Based on a specific benchmark
scenario of CP violation, we analyze the phenomenological impact of explicit CP
violation in the Minimal Supersymmetric Standard Model on these Higgs boson
decays. The presence of CP--violating phases could be confirmed either directly
through the measurement of a CP--odd polarization asymmetry of the produced
charginos and neutralinos, or through the dependence of CP--even quantities
(branching ratios and masses) on these phases.


title:
Electron Mass Operator in a Strong Magnetic Field and Dynamical Chiral
  Symmetry Breaking

abstract:
  The electron mass operator in a strong magnetic field is calculated. The
contribution of higher Landau levels of virtual electrons, along with the
ground Landau level, is shown to be essential in the leading log approximation.
The effect of the electron dynamical mass generation by a magnetic field is
investigated. In a model with N charged fermions, it is shown that some
critical number N_{cr} exists for any value of the electromagnetic coupling
constant alpha, such that the fermion dynamical mass is generated with a
doublet splitting for N < N_{cr}, and the dynamical mass does not arise at all
for N > N_{cr}, thus leaving the chiral symmetry unbroken.


title: On the Stabilization of the Size of Extra Dimensions

abstract:
  We derive a general formalism for constructing a four-dimensional effective
action for the radion field in 5 dimensions, taking into account the possible
dependence of the scale factor on the internal coordinate. First and second
variations of the action with respect to the size of the extra dimension
reveals two types of algebraic constraints on the combination of brane and bulk
Lagrangians that extremize the action, and provide an effective mass for the
radion field. We derive a compact formula for the radion mass squared in terms
of brane and bulk potentials for the case of a bulk scalar field. We further
specialize these constraints for several, five-dimensional realizations of
brane world models.


title: Gauged Inflation

abstract:
  We propose a model for cosmic inflation which is based on an effective
description of strongly interacting, nonsupersymmetric matter within the
framework of dynamical abelian projection and centerization. The underlying
gauge symmetry is assumed to be SU(N) with N$\gg$1. Appealing to a
thermodynamical treatment, the ground-state structure of the model is
determined by a potential for the inflaton field (monopole condensate) which
allows for nontrivially BPS saturated and thereby stable solutions. For $T<M_P$
this leads to an apparent decoupling of gravity from the inflaton dynamics. The
ground state dynamics implies a heat capacity for the vacuum leading to
inflation for temperatures comparable to the mass scale $M$ of the potential.
The dynamics has an attractor property. In contrast to the usual slow-roll
paradigm we have $m\gg H$ during inflation. As a consequence, density
perturbations generated from the inflaton are irrelevant for the formation of
large-scale structure, and the model has to be supplemented with an inflaton
independent mechanism for the generation of spatial curvature perturbations.
Within a small fraction of the Hubble time inflation is terminated by a
transition of the theory to its center symmetric phase. Due to the prevailing
$Z_{N}$ symmetry relic vector bosons are stabilized and therefore potential
originators of UHECR's beyond the GZK bound.


title: Charm mass corrections to the bottomonium mass spectrum

abstract:
  The one-loop corrections to the bottomonium mass spectrum due to the finite
charm mass are evaluated in the framework of the relativistic quark model. The
obtained corrections are compared with the results of perturbative QCD.


title: Scalar mesons above and below 1 GeV

abstract:
  We show that two nonets and a glueball provide a consistent description of
data on scalar mesons below 1.7 GeV. Above 1 GeV the states form a conventional
(q bar q) nonet mixed with the glueball of lattice QCD. Below 1 GeV the states
also form a nonet, as implied by the attractive forces of QCD, but of more
complicated nature. Near the center they are 4 quark states of the Jaffe type
in S-wave, with some (q bar q) in P-wave, but further out they rearrange in
colour to two colourless (q bar q) pairs and finally as meson-meson states. A
simple effective chiral model for such a system with two scalar nonets can be
made involving two coupled linear sigma models. One of these could be looked
upon as the Higgs sector of nonpertubative QCD.


title:
Intrinsic Polarized Strangeness and Lambda Polarization in
  Deep-Inelastic Production

abstract:
  We propose a model for the longitudinal polarization of Lambda baryons
produced in deep-inelastic lepton scattering at any xF, based on static SU(6)
quark-diquark wave functions and polarized intrinsic strangeness in the nucleon
associated with individual valence quarks. Free parameters of the model are
fixed by fitting NOMAD data on the longitudinal polarization of Lambda hyperons
in neutrino collisions. Our model correctly reproduces the observed dependences
of Lambda polarization on the kinematic variables. Within the context of our
model, the NOMAD data imply that the intrinsic strangeness associated with a
valence quark has anticorrelated polarization. We also compare our model
predictions with results from the HERMES and E665 experiments using charged
leptons. Predictions of our model for the COMPASS experiment are also
presented.


title: Exploring the QED vacuum with laser interferometers

abstract:
  It is demonstrated that the nonlinear, and as yet unobserved, QED effect of
slowing down light by application of a strong magnetic field may be observable
with large laser interferometers like for instance LIGO or GEO600.


title:
Neutrino Oscillations with a Proton Driver Upgrade and an Off-Axis
  Detector: A Case Study

abstract:
  We study the physics capabilities of the NuMI beamline with an off-axis
highly-segmented iron scintillator detector and with the inclusion of the
currently under study proton driver upgrade. We focus on the prospects for the
experimental determination of the remaining neutrino oscillation parameters,
assuming different outcomes for experiments under way or in preparation. An
optimization of the beam conditions and detector location for the detection of
the nu_mu to nu_e transitions is discussed. Different physics scenarios were
considered, depending on the actual solution of the solar neutrino puzzle. If
KamLAND measures Delta m^2_solar, we find it possible to measure both
|U_{e3}|^2 and the CP violating phase delta within a viable exposure time,
assuming a realistic detector and a complete data analysis. Exposure to both
neutrino and antineutrino beams is necessary. We can, in addition, shed light
on Delta m^2_solar if its value is at the upper limit of KamLAND sensitivity
(i.e. the precise value of Delta m^2_solar remains unknown even after KamLAND).
If the solar neutrino solution is not in the LMA region, we can measure
|U_{e3}|^2 and determine the neutrino mass hierarchy. The existence of the
proton driver is vital for the feasibility of most of these measurements.


title: BCS-Bose Crossover in Color Superconductivity

abstract:
  It is shown that the onset of the color superconducting phase occurs in the
BCS-BE crossover region.


title: gg-->H-->tau tau at the Upgraded Fermilab Tevatron

abstract:
  We study the neutral Higgs boson production via the gluon fusion process with
the $\tautau$ final state at the upgraded Fermilab Tevatron, including a
complete simulation of signal channels and leading background processes. For
the SM Higgs boson, this $h\to \tautau$ channel may provide important addition
for the Higgs boson discovery in the mass range 120-140 GeV. In minimal
supersymmetric models, natural enhancement for the signal rate over the SM
expectation makes the $h,H,A\to \tautau$ signal observable for large
$\tan\beta$ and low $M_A$, which may lead to full coverage for SUSY Higgs
parameters at the Tevatron with a moderate integrated luminosity.


title:
Does parton saturation at high density explain hadron multiplicities at
  RHIC ?

abstract:
  We discuss the recent claim that hadron multiplicities measured at RHIC
energies are directly described in terms of gluon degrees of freedom fixed from
the initial conditions of central heavy ion collisions. The argument is based
on the parton saturation scenario expected to be valid at high parton densities
and on the assumption of conserved gluon number. Alternatively we conjecture
that "bottom-up" equilibration before hadronization modifies this picture, due
to nonconservation of the number of gluons.


title: Can the CP asymmetries in $B\to \psi K_S$ and $B\to \psi K_L$ differ?

abstract:
  In the standard model the CP asymmetries in $B\to \psi K_S$ and $B\to \psi
K_L$ are equal in magnitude and opposite in sign to very good approximation. We
compute the order $\epsilon_K$ corrections to each of these CP asymmetries and
find that they give a deviation from $\sin 2\beta$ at the half percent level,
which may eventually be measurable. However, the correction to $a_{CP}(B\to
\psi K_S)+a_{CP}(B\to \psi K_L)$ due to $\epsilon_K$ is further suppressed. The
dominant corrections to this sum, at the few times $10^{-3}$ level, come from
the $B$ lifetime difference, and CP violation in $B- \bar B$ mixing and $B \to
\psi K$ decay. New physics could induce a significant difference in the
$\sin(\Delta m_B t)$ time dependence in the asymmetries if and only if the
"wrong-flavor" amplitudes $B \to \psi \bar K$ or $\bar B \to \psi K$ are
generated. A scale of new physics that lies well below the weak scale would be
required. Potential scenarios are therefore highly constrained, and do not
appear feasible. A direct test is proposed to set bounds on such effects.


title:
Renormalization group improvement of the spectrum of Hydrogen-like atoms
  with massless fermions

abstract:
  We obtain the next-to-next-to-leading-log renormalization group improvement
of the spectrum of Hydrogen-like atoms with massless fermions by using
potential NRQED. These results can also be applied to the computation of the
muonic Hydrogen spectrum where we are able to reproduce some known double logs
at O(m\alpha^6). We compare with other formalisms dealing with log resummation
available in the literature.


title: Two Photon Width of eta_c (paper version)

abstract:
  We discuss the measured partial width of the pseudoscalar charmonium state
eta_c into two photons. Predictions from potential models are examined and
compared with experimental values. Including radiative corrections, it is found
that present measurements are compatible both with a QCD type potential and
with a static Coulomb potential. The latter is then used to give an estimate on
the eta_b decay into two photons. Results for eta_c are also compared with
those from j/psi data through the NRQCD model.


title: The Lightest Scalar Nonet as Higgs Bosons of Strong Interactions

abstract:
  I discuss how an extra light scalar meson multiplet could be understood as an
effective Higgs nonet of a hidden local U(3) symmetry. There is growing
evidence that low energy data requires in addition to a conventional (q bar q)
nonet near 1.4 GeV, another light scalar nonet-like structure below 1 GeV,
(sigma(600), a_0(980), f_0(980), kappa), which could be interpreted as such a
Higgs nonet.


title:
Effects of initial axion production and photon--axion oscillation on
  type Ia supernova dimming

abstract:
  Recently, Csaki, Kaloper and Terning (CKT) suggested that axion-photon
oscillation in the intergalactic medium can explain the observed dimming of
distant type Ia supernovae. This mechanism works only if the initial axion flux
is much smaller than the initial photon flux. We study several mechanisms for
such initial axion production. The direct axion production in the supernovae,
the photon-axion oscillation in the magnetic field of supernovae and in the
magnetic field of their host galaxies are addressed. We find it likely that the
initial axion flux is very small and therefore does not pose a problem to the
CKT mechanism.


title: Symmetries, Large Leptonic Mixing and a Fourth Generation

abstract:
  We show that large leptonic mixing occurs most naturally in the framework of
the Sandard Model just by adding a fourth generation. One can then construct a
small $Z_4$ discrete symmetry, instead of the large $S_{4L}\times S_{4R}$,
which requires that the neutrino as well as the charged lepton mass matrices be
proportional to a $4\times 4$ democratic mass matrix, where all entries are
equal to unity. Without considering the see-saw mechanism, or other more
elaborate extensions of the SM, and contrary to the case with only 3
generations, large leptonic mixing is obtained when the symmetry is broken.


title: On Black Hole Detection with the OWL/Airwatch Telescope

abstract:
  In scenarios with large extra dimensions and TeV scale gravity ultrahigh
energy neutrinos produce black holes in their interactions with the nucleons.
We show that ICECUBE and OWL may observe large number of black hole events and
provide valuable information about the fundamental Planck scale and the number
of extra dimensions. OWL is especially well suited to observe black hole events
produced by neutrinos from the interactions of cosmic rays with the 3 K
background radiation. Depending on the parameters of the scenario of large
extra dimensions and on the flux model, as many as 28 events per year are
expected for a Planck scale of 3 TeV.


title:
The exclusive $B -> (K, K^*) \ell^+ \ell^-$ decays in a CP softly broken
  two Higgs doublet model

abstract:
  We study the differential branching ratio, forward-backward asymmetry,
CP-violating asymmetry, CP-violating asymmetry in the forward-backward
asymmetry and polarization asymmetries in the $B -> K \ell^+ \ell^-$ and $B ->
K^* \ell^+ \ell^-$ decays in the context of a CP softly broken two Higgs
doublet model. We analyze the dependencies of these observables on the model
parameters by paying a special attention to the effects of neutral Higgs boson
(NHB) exchanges and possible CP violating effects. We find that NHB effects are
quite significant for both decays. A combined analysis of above-mentioned
observables seems to be very promising as a testing ground for new physics
beyond the SM, especially for the existence of the CP-violating phase in the
theory.


title: Structure of neutrino mass matrix

abstract:
  We reconstruct the neutrino mass matrix in the flavor basis, using
experimental data on neutrino oscillations. Both normal and inverted hierarchy
(ordering) of the mass spectrum are considered. The dependence of the matrix
structure on CP violating Majorana phases $\rho$ and $\sigma$ is studied. The
results are shown in $\rho-\sigma$ plots. We find the possible matrix
structures in the different regions of parameters and discuss the perspectives
to further restrict the matrix structure in future experiments.


title: A Dynamical Scaling Law for Jet Tomography

abstract:
  Medium modifications of parton fragmentation provide a novel tomographic tool
for the study of the hot and dense matter created in ultrarelativistic
nucleus-nucleus collisions. Their quantitative analysis, however, is
complicated by the strong dynamical expansion of the collision region. Here, we
establish for the multiple scattering induced gluon radiation spectrum a
scaling law which relates medium effects in a collision of arbitrary dynamical
expansion to that in an equivalent static scenario. Based on this scaling, we
calculate for typical kinematical values of the RHIC and LHC heavy ion programs
medium-modified parton fragmentation functions for heavy ion collisions with
realistic dynamical expansion.


title:
GR@PPA_4b: A Four Bottom Quark Production Event Generator for PP/PPbar
  Collisions

abstract:
  We have developed an event generator, named GR@PPA_4b, for the four bottom
quark (b bbar b bbar) production processes at PP and PPbar collisions. The
program implements all of the possible processes at the tree level within the
framework of the Standard Model. Users can generate events from the Higgs boson
and photon/Z mediated processes, as well as those from pure QCD interactions.
The integration and the event generation are performed within the newly
developed GR@PPA framework, an extension of the GRACE automatic event-generator
generation system to hadron collisions. This program is so designed that it can
be embedded in a general-purpose event generator PYTHIA version 6.1. PYTHIA
adds the initial- and final-state parton showers and simulates the
hadronization and decays to make generated events realistic. It should be
emphasized that a huge number of diagrams and complicated four-body kinematics
are dealt with strictly in GR@PPA_4b. This program will be useful for studies
of Higgs boson productions, especially those in extended models where the
Yukawa coupling to b quarks is greatly enhanced. The source code is located in
http://atlas.kek.jp/physics/nlo-wg/index.html .


title: Two-point functions for SU(3) Polyakov Loops near T_c

abstract:
  We discuss the behavior of two point functions for Polyakov loops in a SU(3)
gauge theory about the critical temperature, T_c. From a Z(3) model, in mean
field theory we obtain a prediction for the ratio of masses at T_c, extracted
from correlation functions for the imaginary and real parts of the Polyakov
loop. This ratio is m_i/m_r = 3 if the potential only includes terms up to
quartic order in the Polyakov loop; its value changes as pentic and hexatic
interactions become important. The Polyakov Loop Model then predicts how
m_i/m_r changes above T_c.


title: Forced Tunneling and Turning State Explosion in Pure Yang-Mills Theory

abstract:
  We consider forced tunneling in QCD, described semiclassically by
instanton-antiinstanton field configurations. By separating topologically
different minima we obtain details of the effective potential and study the
turning states, which are similar to the sphaleron solution in electroweak
theory. These states are alternatively derived as minima of the energy under
the constraints of fixed size and Chern-Simons number. We study, both
analytically and numerically, the subsequent evolution of such states by
solving the classical Yang-Mills equations in real time, and find that the
gauge field strength is quickly localized into an expanding shell of radiating
gluons. The relevance to high-energy collisions of hadrons and nuclei is
briefly discussed.


title:
Enhancement of Br(B_d -> mu^+ mu^-)/Br(B_s -> mu^+ mu^-) in the MSSM
  with Modified Minimal Flavour Violation and Large tan(beta)

abstract:
  We extend our previous analysis of the decays B_{d,s} -> mu^+ mu^- in the
Minimal Supersymmetric Standard Model (MSSM) to include gluino and neutralino
contributions. We provide analytic formulae, valid at large values of
tan(beta), for the scalar and pseudoscalar Wilson coefficients arising from
neutral Higgs boson exchange diagrams with gluinos and neutralinos. Together
with the remaining contributions (W^{+/-}, H^{+/-}, charginos), and assuming
the Cabibbo-Kobayashi-Maskawa (CKM) matrix to be the only source of flavour
violation, we assess their implications for the branching fractions Br(B_{d,s}
-> mu^+ mu^-). Of particular interest is the quantity R = Br(B_d -> mu^+
mu^-)/Br(B_s -> mu^+ mu^-), since (i) the theoretical errors cancel to a large
extent, and (ii) it offers a theoretically clean way of extracting the ratio
|V_{td}/V_{ts}| in the Standard Model (SM), which predicts R_SM ~
|V_{td}/V_{ts}|^2 ~ O(10^{-2}). Exploring three different scenarios of modified
minimal flavour violation, we find that part of the MSSM parameter space can
accommodate large Br(B_{d,s} -> mu^+ mu^-) branching fractions, while being
consistent with various experimental constraints. More importantly, we show
that the ratio R can be as large as O(1), while the individual branching
fractions may be amenable to detection by ongoing experiments. We conclude that
within the MSSM with large tan(beta) the decay rates of B_{d} -> mu^+ mu^- and
B_{s} -> mu^+ mu^- can be of comparable size even in the case where flavour
violation is due solely to the CKM matrix.


title: Real-time pion propagation in finite-temperature QCD

abstract:
  We argue that in QCD near the chiral limit, at all temperatures below the
chiral phase transition, the dispersion relation of soft pions can be expressed
entirely in terms of three temperature-dependent quantities: the pion screening
mass, a pion decay constant, and the axial isospin susceptibility. The
definitions of these quantities are given in terms of equal-time (static)
correlation functions. Thus, all three quantities can be determined directly by
lattice methods. The precise meaning of the Gell-Mann--Oakes--Renner relation
at finite temperature is given.


title:
Thermal Parameters in Heavy Ion Collisions at SPS and RHIC: Centrality
  Dependence

abstract:
  The centrality dependence of thermal parameters describing hadron
multiplicities and intermediate-mass dilepton spectra in heavy-ion collisions
at SPS and RHIC is analyzed. From experimental hadron multiplicities we deduce
evidence for strangeness saturation at high energy and maximum centrality. The
observed dilepton spectra can be parameterized by a centrality independent
temperature.


title: Phenomenology of Randall-Sundrum Black Holes

abstract:
  We explore the phenomenology of microscopic black holes in the $S^1/Z_2$
Randall-Sundrum (RS) model. We consider the canonical framework in which both
gauge and matter fields are confined to the brane and only gravity spills into
the extra dimension. The model is characterized by two parameters, the mass of
the first massive graviton $(m_1)$, and the curvature $1/\ell$ of the RS
anti-de Sitter space. We compute the sensitivity of present and future cosmic
ray experiments to various regions of $\ell$ and $m_1,$ and compare with that
of Runs I and II at the Tevatron. As part of our phenomenological analysis, we
examine constraints placed on $\ell$ by AdS/CFT considerations.


title: Reparameterization Invariance for Collinear Operators

abstract:
  We discuss restrictions on operators in the soft-collinear effective theory
(SCET) which follow from the ambiguity in the decomposition of collinear
momenta and the freedom in the choice of light-like basis vectors $n$ and $\bar
n$. Invariance of SCET under small changes in $n$ and/or $\bar n$ implies a
symmetry of the effective theory that constrains the form of allowed operators
with collinear fields. The restrictions occur at a given order in the power
counting as well as between different orders. As an example, we present the
complete set of higher order operators that are related to the collinear quark
kinetic term.


title:
The Coupling of eta Mesons to Quarks and Baryons from D_s^* -> D_s pi^0
  Decay

abstract:
  The known ratio of the branching fractions for D_s^* --> D_s pi^0 and D_s^*
--> D_s gamma may be used to extract the coupling of eta mesons to strange
quarks once the value of the pi^0-eta mixing angle is known. This requires that
realistic models for the spectra as well as the magnetic dipole (M1) decays of
the heavy-light (Q qbar) mesons are available. The coupling of eta mesons to
light quarks may then be estimated using SU(3) flavor symmetry. Applied to the
quark model for the baryons, an eta NN pseudovector coupling constant of f_{eta
NN} = 0.35^{+0.15}_{-0.25} is obtained. If the charm quark couples
significantly to the eta meson, as is suggested by the decay mode psi' -->
J/(psi eta), then somewhat larger values of f_{eta NN} can be obtained. These
values are sufficiently small to be consistent with phenomenological analysis
of photoproduction of the eta on the nucleon and the reaction pp --> pp eta.


title: A supernova constraint on bulk majorons

abstract:
  In models with large extra dimensions all gauge singlet fields can in
principle propagate in the extra dimensional space. We have investigated
possible constraints on majoron models of neutrino masses in which the majorons
propagate in extra dimensions. It is found that astrophysical constraints from
supernovae are many orders of magnitude stronger than previous accelerator
bounds. Our findings suggest that unnatural types of the "see-saw" mechanism
for neutrino masses are unlikely to occur in nature, even in the presence of
extra dimensions.


title: Neural Network Parametrization of Deep-Inelastic Structure Functions

abstract:
  We construct a parametrization of deep-inelastic structure functions which
retains information on experimental errors and correlations, and which does not
introduce any theoretical bias while interpolating between existing data
points. We generate a Monte Carlo sample of pseudo-data configurations and we
train an ensemble of neural networks on them. This effectively provides us with
a probability measure in the space of structure functions, within the whole
kinematic region where data are available. This measure can then be used to
determine the value of the structure function, its error, point-to-point
correlations and generally the value and uncertainty of any function of the
structure function itself. We apply this technique to the determination of the
structure function F_2 of the proton and deuteron, and a precision
determination of the isotriplet combination F_2[p-d]. We discuss in detail
these results, check their stability and accuracy, and make them available in
various formats for applications.


title:
CP-Violation in the Production of Tau-Leptons at TESLA with Beam
  Polarization

abstract:
  We study the prospects of discovering CP-violation in the production of
tau-leptons in the reaction {e+e- --> tau+tau- at TESLA, an e+e- linear
collider with center-of-mass energies of 500 or even 800 GeV. Non-vanishing
expectation values of certain correlations between the momenta of the decay
products of the two tau leptons would signalthe presence of CP-violation beyond
the standard model. We study how longitudinal beam polarization of the electron
and positron beams will enhance these correlations. We find that T-odd and
T-even vector correlations are well suited for the measurements of the real and
imaginary parts of the electric dipole form factors. We expect measurements of
the real part with a precision of roughly 10^-20 ecm and of the imaginary part
of 10^-17 ecm. This compares well with the size of the expected effects in many
extensions of the standard model.


title: Quark and Nucleon Self-Energy in Dense Matter

abstract:
  In a recent work we introduced a nonlocal version of the
Nambu--Jona-Lasinio(NJL) model that was designed to generate a quark
self-energy in Euclidean space that was similar to that obtained in lattice
simulations of QCD. In the present work we carry out related calculations in
Minkowski space, so that we can study the effects of the significant vector and
axial-vector interactions that appear in extended NJL models and which play an
important role in the study of the $\rho$, $\omega$ and $a_1$ mesons. We study
the modification of the quark self-energy in the presence of matter and find
that our model reproduces the behavior of the quark condensate predicted by the
model-independent relation $<\bar qq>_{\rho} = <\bar
qq>_0(1-\sigma_N\rho_N/f_{\pi}^2m_{\pi}^2 +...)$, where $\sigma_N$ is the
pion-nucleon sigma term and $\rho_N$ is the density of nuclear matter. (Since
we do not include a model of confinement, our study is restricted to the
analysis of quark matter. We provide some discussion of the modification of the
above formula for quark matter.) The inclusion of a quark current mass leads to
a second-order phase transition for the restoration of chiral symmetry. That
restoration is about 80% at twice nuclear matter density for the model
considered in this work. We also find that the part of the quark self-energy
that is explicitly dependent upon density has a strong negative Lorentz-scalar
term and a strong positive Lorentz-vector term, which is analogous to the
self-energy found for the nucleon in nuclear matter when one makes use of the
Dirac equation for the nucleon. In this work we calculate the nucleon self
-energy in nuclear matter using our model of the quark self-energy and obtain
satisfactory results.


title: Nonlocality of the Nucleon Axial Charge and Solar Neutrino Problem

abstract:
  It is shown that the specific space distribution of the nucleon axial charge
may lead to the significant reduction of the cross section of the reaction
$p+p\to D+e^++\nu$ and may provide the mechanism to explain observed deficit of
solar neutrinos.


title: Lepton number violating muon decay and the LSND neutrino anomaly

abstract:
  We show that lepton number violating muon decays, \mu^+ -> e^+ + \nu_e-bar +
\nu_i-bar (i=e, \mu or \tau), can consistently explain the neutrino anomaly
reported by the LSND experiment. Two effective operators in the Standard Model
are identified which lead to just such decays and no other processes. The scale
of new physics \Lambda must be relatively low, \Lambda < 500 GeV. Extensions of
the Standard Model which realize these effective operators are presented. Since
new physics affects only the decay of the muon, and not of \pi^+-, our scenario
predicts a null result for \nu_\mu-bar - \nu_e-bar oscillation searches at the
Fermilab mini--BOONE experiment. Models which realize these effective
operators, while consistent with all available data, can be tested in the near
future through (i) discovery of new scalar particles with masses below about
500 GeV, (ii) small but observable deviations in e^+ e^- -> \mu^+ \mu^- and e^+
e^- -> \nu \nu \gamma cross sections, (iii) observable corrections to the muon
g-2, and (iv) lepton number violating Z^0 decays with branching ratios of order
10^{-7}.


title: Decays of the $\hat\rho(1^{-+})$ Exotic Hybrid and $\eta$-$\eta'$ Mixing

abstract:
  QCD sum-rules are used to calculate the $\hat\rho(1^{-+})\to\pi\eta,
\pi\eta'$ decay widths of the exotic hybrid in two different $\eta-\eta'$
mixing schemes.
  In the conventional flavour octet-singlet mixing scheme, the decay widths are
both found to be small, while in the recently-proposed quark mixing scheme, the
decay width $\Gamma_{\hat\rho\to\eta\pi}\approx 250 MeV$ is large compared with
the decay width $\Gamma_{\hat\rho\to\eta^\prime\pi}\approx 20 MeV$. These
results provide some insight into $\eta$-$\eta'$ mixing and hybrid decay
features.


title:
The charm quark EDM and singlet P-wave charmonium production in
  supersymmetry

abstract:
  We analyze the singlet $P$--wave charmonium production at $e^+ e^-$ colliders
within the framework of unconstrained supersymmetry. We show that the
CP--violating transitions, dominated by the gluino exchange, are typically four
orders of magnitude larger than the CP--conserving ones, and former is
generated by the electric dipole moment of the charm quark. Our results can be
directly tested via the charmonium searches at the CLEO--c experiment.


title: Nucleon Charge and Magnetization Densities from Sachs Form Factors

abstract:
  Relativistic prescriptions relating Sachs form factors to nucleon charge and
magnetization densities are used to fit recent data for both the proton and the
neutron. The analysis uses expansions in complete radial bases to minimize
model dependence and to estimate the uncertainties in radial densities due to
limitation of the range of momentum transfer. We find that the charge
distribution for the proton is significantly broad than its magnetization
density and that the magnetization density is slightly broader for the neutron
than the proton. The neutron charge form factor is consistent with the Galster
parametrization over the available range of Q^2, but relativistic inversion
produces a softer radial density. Discrete ambiguities in the inversion method
are analyzed in detail. The method of Mitra and Kumari ensures compatibility
with pQCD and is most useful for extrapolating form factors to large Q^2.


title:
Confronting the Conventional Ideas of Grand Unification with Fermion
  Masses, Neutrino Oscillations and Proton Decay

abstract:
  It is noted that a set of facts points to the relevance in four dimensions of
conventional supersymmetric unification based on minimally a string-unified
G(224)-symmetry, or maximally SO(10). These include: (i) the observed family-
structure, (ii) quantization of electric charge, (iii) meeting of the three
gauge couplings, (iv) neutrino oscillations [in particular the value of $\Delta
m^2(\nu_\mu-\nu_\tau)$, suggested by SuperK], (v) the intricate pattern of the
masses and mixings of the fermions, including the smallness of $V_{cb}$ and the
largeness of $\theta^{osc}_{\nu_{\mu}\nu_{\tau}}$, and (vi) the need for B-L as
a generator to implement baryogenesis (via lepto-genesis). A concrete proposal
is presented within a predictive SO(10)/G(224)-framework that successfully
describes the masses and mixings of all fermions, including the neutrinos -
with eight predictions, all in agreement with observation. Within this
framework, a systematic study of proton decay is carried out, which (a) pays
special attention to its dependence on the fermion masses, (b) limits the
threshold corrections so as to preserve natural coupling unification, and (c)
uses recently improved values of the matrix element and renormalization
effects. Allowing for both MSSM and its proposed variant, the so-called ESSM,
as effective low-energy theories, the study shows that a conservative upper
limit on the proton lifetime is about (1/3 - 2)$\times 10^{34}$ years, with
$\bar{\nu}K^{+}$ being the dominant decay mode, and quite possibly
$\mu^{+}K^{0}$ and $e^+\pi^0$ being prominent. This in turn strongly suggests
that an improvement in the current sensitivity by a factor of five to ten ought
to reveal proton decay. For comparison, some alternatives to the conven- tional
approach to unification pursued here are mentioned at the end.


title:
Effects of the R-parity violation in the minimal supersymmetric standard
  model on dilepton pair production at the CERN LHC

abstract:
  We investigate in detail the effects of the R-parity lepton number violation
in the minimal supersymmetric standard model (MSSM) on the parent process $pp
\to e^+ e^- + X$ at the CERN Large Hadron Collider (LHC). The numerical
comparisons between the contributions of the R-parity violating effects to the
parent process via the Drell-Yan subprocess and the gluon-gluon fusion are
made. We find that the R-violating effects on $e^+ e^-$ pair production at the
LHC could be significant. The results show that the cross section of the $ e^+
e^-$ pair productions via gluon-gluon collision at the LHC can be of the order
of $10^2$ fb, and this subprocess maybe competitive with the production
mechanism via the Drell-Yan subprocess. We give also quantitatively the
analysis of the effects from both the mass of sneutrino and coupling strength
of the R-parity violating interactions.


title: Structure functions of the nucleon and nuclei in neutrino reactions

abstract:
  Determination of parton distribution functions in nuclei is important for
calculating nuclear corrections in oscillation experiments, from which detailed
information should be extracted on neutrino properties. First, nuclear parton
distributions are discussed for explaining high-energy nuclear reaction data.
Possible nuclear modification is explained for valence-quark and antiquark
distributions. It is rather difficult to determine gluon distributions in
nuclei. Next, reversing the topic, we discuss structure functions which could
be investigated by neutrino reactions. Determination of polarized parton
distributions in the nucleon is discussed in polarized neutrino reactions. In
addition, neutrino reactions should be important for finding nuclear
modification of valence-quark distributions at small x if structure function
ratios F_3^A/F_3^D are measured for various nuclei.


title:
Measuring the Spin of Invisible Massive Graviton Excitations at Future
  Linear Colliders

abstract:
  We consider the production process e-e+ -> G\gamma of invisible gravitons (G)
at future linear colliders. We discuss whether the angular distribution of the
photon (\gamma) can be used to measure the spin of the invisible graviton, or
of any other invisible objects produced. We propose a method based on the
Fourier expansion of the transverse energy squared moment distribution of the
photon. We provide justification for this method, and confirm, especially for
the case of two extra dimensions, that the method is valid within a realistic
setup, which includes the simulation of the Standard Model background,
beamstrahlung, bremsstrahlung, calorimeter resolution and calorimeter coverage.
When the number of extra dimensions is increased, the angular distribution does
not provide sufficient information to extract the spin, but this method still
offers a useful parameterization of the single photon cross section using which
the nature of the missing object can be studied.


title: Matching NLO QCD computations and parton shower simulations

abstract:
  We propose a method for matching the next-to-leading order (NLO) calculation
of a given QCD process with a parton shower Monte Carlo (MC) simulation. The
method has the following features: fully exclusive events are generated, with
hadronization according to the MC model; total exclusive rates are accurate to
NLO; NLO results for distributions are recovered upon expansion in $\alpha_S$;
hard emissions are treated as in NLO computations while soft/collinear
emissions are handled by the MC simulation, with the same logarithmic accuracy
as the MC; and matching between the hard- and soft/collinear-emission regions
is smooth. A fraction of events with negative weight is generated, but
unweighting remains possible with reasonable efficiency. The method is
clarified using a simple toy model, and illustrated by application to the
hadroproduction of W$^+$W$^-$ pairs.


title: Exact resolution of the Baxter equation for reggeized gluon interactions

abstract:
  The interaction of reggeized gluons in multi-colour QCD is considered in the
Baxter-Sklyanin representation, where the wave function is expressed as a
product of Baxter functions Q(lambda) and a pseudo-vacuum state. We find n
solutions of the Baxter equation for a composite state of n gluons with poles
of rank r in the upper lambda semi-plane and of rank n-1-r in the lower lambda
semi-plane (0 leq r leq n-1). These solutions are related by n-2 linear
equations with coefficients depending on coth (pi lambda). The poles cancel in
the wave function, bilinear combination of holomorphic and anti-holomorphic
Baxter functions, guaranteeing its normalizability. The quantization of the
intercepts of the corresponding Regge singularities appears as a result of the
physical requirements that the holomorphic energies for all solutions of the
Baxter equation are the same and the total energies, calculated around two
singularities lambda, lambda^* --> + i or -i, coincide. It results in simple
properties of the zeroes of the Baxter functions. For illustration we calculate
the parameters of the reggeon states constructed from three and four gluons.
For the Odderon the ground state has conformal spin |m -m | = 1 and its
intercept equals unity. The ground state of four reggeized gluons possesses
conformal spin 2 and its intercept turns out to be higher than that for the
BFKL Pomeron. We calculate the anomalous dimensions of the corresponding
operators for arbitrary alpha_s/omega.


title: Finite Grand Unified Theories and the Quark Mixing Matrix

abstract:
  In N = 1 super Yang-Mills theories, under certain conditions satisfied by the
spectrum and the Yukawa couplings, the beta functions will vanish to all orders
in perturbation theory. We address the generation of realistic quark mixing
angles and masses in such finite Grand Unified Theories. Working in the context
of finite SUSY SU(5), we present several examples with realistic quark mixing
matrices. Non-Abelian discrete symmetries are found to be important in
satisfying the conditions for finiteness. Our realistic examples are based on
permutation symmetries and the tetrahedral symmetry $A_4$. These examples
enable us to address questions such as the decay rate of the proton in finite
GUTs.


title: E_6 multiplets and unification in extra dimensions

abstract:
  We study the effect of all matter multiplets contained in {\bf 27}
representation of $E_6$ GUT on gauge coupling unification in extra dimensions.
Extra members of {\bf 27} multiplets of all three generations have their `zero
modes' near $m_t$ such that they can be directly probed. From TeV scale onwards
extra dimensions open up, theory becomes N=2 supersymmetric and gauge couplings
unify or they do not, depending on how we distribute matter fields and gauge
fields in bulk and brane. We find three such possible embedding which will lead
to perfect gauge coupling unification below 100 TeV region for one extra
dimension and lower than that if number of extra dimensions is larger.


title:
Special relativity constraints on the effective constituent theory of
  hybrids

abstract:
  We consider a simplified constituent model for relativistic
strong-interaction decays of hybrid mesons. The model is constructed using
rules of renormalization group procedure for effective particles in light-front
quantum field theory, which enables us to introduce low-energy phenomenological
parameters. Boost covariance is kinematical and special relativity constraints
are reduced to the requirements of rotational symmetry. For a hybrid meson
decaying into two mesons through dissociation of a constituent gluon into a
quark-anti-quark pair, the simplified constituent model leads to a rotationally
symmetric decay amplitude if the hybrid meson state is made of a constituent
gluon and a quark-anti-quark pair of size several times smaller than the
distance between the gluon and the pair, as if the pair originated from one
gluon in a gluonium state in the same effective theory.


title: Spontaneous chiral symmetry breaking in the linked cluster expansion

abstract:
  We investigate dynamical chiral symmetry breaking in the Coulomb gauge
Hamiltonian QCD. Within the framework of the linked cluster expansion we extend
the BCS ansatz for the vacuum and include correlation beyond the
quark-antiquark paring. In particular we study the effects of the three-body
correlations involving quark-antiquark and transverse gluons. The high momentum
behavior of the resulting gap equation is discussed and numerical computation
of the chiral symmetry breaking is presented.


title: Static potential in baryon in the method of field correlators

abstract:
  The static three-quark potential in arbitrary configuration of quarks is
calculated analytically. It is shown to be in a full agreement with the precise
numerical simulations in lattice QCD. The results of the work have important
application in nuclear physics, as they allow to perform accurate analytic
calculations of spectra of the baryons.


title: Status of Supersymmetry in the Light of Recent Experiments

abstract:
  In this talk we discuss the constraints on supersymmetry arising from data
from a number of recent experiments. There appears to be good cumulative
evidence from experiment in favor of positivity of the sign of the Higgs mixing
parameter $\mu$. Implications of this result for Yukawa unification are
discussed since Yukawa unification is sensitive to the $\mu$ sign. An analysis
of dark matter under the constraints of Yukawa unification is also given. It is
shown that the simultaneous imposition of all existing constraints sharply
defines the parameter space of models. Specifically models with nonuniversality
of gaugino masses provide a simple resolution to the positivity of the $\mu$
parameter and Yukawa unification. Implications of these results for colliders
and for the next generation of dark matter searches are also discussed.


title: Large Nc means Nc=3

abstract:
  We show that the nonperturbative solution of the SU(2) linear sigma model
field theory requires color number Nc=3. Also, we show that the three-point and
four-point functions bootstrap (or nonperturbatively ``shrink'') in the chiral
limit to the tree amplitudes. Independently, we show that a chiral phase
transition for Nf=2 requires Tc=180 MeV, consistent with the computer lattice
value (173 +/- 8 MeV).


title: Imprint of SNO neutral current data on the solar neutrino problem

abstract:
  We perform a global analysis in the framework of two active neutrino
oscillations of all solar neutrino data, including the recent SNO day and night
spectra (comprised of the charged current (CC), elastic scattering (ES) and
neutral current (NC) events), the Super-Kamiokande (SK) day and night spectra
(from 1496 days) and the updated SAGE results. We find that the Large Mixing
Angle (LMA) solution is selected at the 99% C.L.; the best-fit parameters are
\Delta m^2=5.6 \times 10^{-5} eV^2 and \theta=32^{\circ}. No solutions with
\theta\geq \pi/4 are allowed at the 5\sigma C.L. Oscillations to a pure sterile
state are excluded at 5.3\sigma, but a sizeable sterile neutrino component
could still be present in the solar flux.


title: Constraints from Neutrinoless Double Beta Decay

abstract:
  We examine the constraints from the recent HEIDELBERG-MOSCOW double beta
decay experiment. It leads us to the almost degenerate or inverse hierarchy
neutrino mass scenario. In this scenario, we obtain possible upper bounds for
the Majorana CP violating phase in the lepton sector by incorporating the data
from the neutrino oscillation, the single beta decay experiments, and from the
astrophysical observation. We also predict the neutrino mass that may be
measurable in the future beta decay experiments.


title:
Possible Effects of Noncommutative Geometry on Weak CP Violation and
  Unitarity Triangles

abstract:
  Possible effects of noncommutative geometry on weak CP violation and
unitarity triangles are discussed by taking account of a simple version of the
momentum-dependent quark mixing matrix in the noncommutative standard model. In
particular, we calculate nine rephasing invariants of CP violation and
illustrate the noncommutative CP-violating effect in a couple of charged
D-meson decays. We also show how inner angles of the deformed unitarity
triangles are related to CP-violating asymmetries in some typical B_d and B_s
transitions into CP eigenstates. B-meson factories are expected to help probe
or constrain noncommutative geometry at low energies in the near future.


title: Ordinary atom-mirror atom bound states: A new window on the mirror world

abstract:
  Mirror symmetry is a plausible candidate for a fundamental symmetry of
particle interactions which can be exactly conserved if a set of mirror
particles exist. The properties of the mirror particles seem to provide an
excellent candidate to explain the inferred dark matter of the Universe and
might also be responsible for a variety of other puzzles in particle physics,
astrophysics, meteoritics and planetary science. One such puzzle -- the
orthopositronium lifetime problem -- can be explained if there is a small
kinetic mixing of ordinary and mirror photons. We show that this kinetic mixing
implies the existence of ordinary atom - mirror atom bound states with
interesting terrestrial and astrophysical implications. We suggest that
sensitive mass spectroscopic studies of ordinary samples containing heavy
elements such as lead might reveal the presence of these bound states, as they
would appear as anomalously heavy elements. In addition to the effects of
single mirror atoms, collective effects from embedded fragments of mirror
matter (such as mirror iron microparticles) are also possible. We speculate
that such mirror matter fragments might explain a mysterious UV photon burst
observed coming from a laser irradiated lead target in a recent experiment.


title: Baryogenesis from primordial tensor perturbations

abstract:
  During inflation primordial quantum fluctuations of the spacetime metric
become classical and there is a spontaneous CPT violation by the spin
connection coupling terms of the metric with fermions. The energy levels of the
left and the right chirality neutrinos is split which gives rise to a net
lepton asymmetry at equilibrium. A net baryon asymmetry of the same magnitude
can be generated from this lepton asymmetry either by a GUT, $B-L$ symmetry or
by electroweak sphaleron processes which preserve $B+L$ symmetry.
  If the amplitude of the primordial tensor perturbations is of the order of
$10^{-6}$ (as is expected from inflation models) and the lepton/baryon number
violating processes freeze out at the GUT era $T_d \sim 10^{16} Gev$ then a
baryon number asymmetry of the correct magnitude $10^{-10}$ can be generated.


title: Symmetry Breaking and Time Variation of Gauge Couplings

abstract:
  Astrophysical indications that the fine structure constant has undergone a
small time variation during the cosmological evolution are discussed within the
framework of the standard model of the electroweak and strong interactions and
of grand unification. A variation of the electromagnetic coupling constant
could either be generated by a corresponding time variation of the unified
coupling constant or by a time variation of the unification scale, of by both.
The various possibilities, differing substantially in their implications for
the variation of low energy physics parameters like the nuclear mass scale, are
discussed. The case in which the variation is caused by a time variation of the
unification scale is of special interest. It is supported in addition by recent
hints towards a time change of the proton-electron mass ratio. Implications for
the analysis of the Oklo remains and for quantum optics tests are discussed.


title: Experimental tests of the Okubo-Zweig-Iizuka rule in hadron interactions

abstract:
  The OZI rule have been tested in a number of experiments in a wide interval
of energies. It was found that the rule is fulfilled well, within few percent
of accuracy. The results of experiments with stopped antiprotons at LEAR
(CERN), where unexpected large violation (by a factor 3-70) of the OZI rule was
found, were quite surprising. Later experiments found strong violation of the
OZI rule not only in antiproton annihilation but also in reactions with protons
and pions.
  In the review we consider the phenomenology of the OZI rule, to what extent
it is valid in the hadron interactions. The experimental evidences of the large
OZI violation are discussed. The polarized strangeness model and its
explanation of the large OZI violation is discussed, the review of other
theoretical models is given.


title: On the Monopole Model Of Form Factors for Heavy Meson Decays

abstract:
  A pole model for the form factors describing heavy to light meson transitions
is constructed, and the results compared with the predictions of the heavy
quark effective theory (HQET). While most of the HQET-predicted relationships
among form factors hold at the maximum value of $q^2$, many are violated,
suggesting that the simplest version of the pole model of meson form factors
should be used with caution, especially when combined with HQET.


title: Stability of the Higgs mass in theories with extra dimensions

abstract:
  We analyze the ultraviolet stability of the Higgs mass in recently proposed
Kaluza-Klein models compactified on S_1/Z_2 or S_1/(Z_2\times Z_2'), both at
the field theory and string theory level. Fayet-Iliopoulos terms of U(1)
hypercharge are shown to be of vital importance for this discussion. Models
with a single Higgs doublet seem to be generically affected by quadratic
divergences.


title:
Non-abelian Topological Strings and Metastable States in Linear Sigma
  Model

abstract:
  Non-abelian (NA) topological string defects exist in QCD with the spontaneous
chiral symmetry breaking $U(N_f)_L \times U(N_f)_R \to U(N_f)_V$. Anomaly
effects lead to domain walls connected to these strings. In the framework of
linear sigma model we find the configuration of these defects. Also we show
that in this model metastable CP violating vacuua exist. Strings as well as
extended regions of metastable vacuua may form during the chiral transition
which could have interesting effects.


title: Exclusive $B\to K^{**} \gamma$ Decays in the QCD LCSR approach

abstract:
  We predict contributions of higher $K$-resonances to the radiative rare
decays $b\to s\gamma$, in the framework of the QCD sum rules on the light cone
(LCSR). Our calculations are restricted to the leading twist-two operators for
$K^*(892)$ and to the asymptotic wave function for the other $K^{**}$-mesons.
Using experimental data on the semileptonic $\tau\to K^{**}\nu_{\tau}$ decays,
we extract the corresponding decay constants for vector and axial-vector
$K^{**}$-mesons. We present results for the corresponding branching ratios and
compare them with the existing theoretical predictions.


title: $\eta-\eta^\prime$ mixing and the next-to-leading-order power correction

abstract:
  The next-to-leading-order $O(1/Q^4)$ power correction for $\eta\gamma$ and
$\eta^\prime\gamma$ form factors are evaluated and employed to explore the
$\eta-\eta^\prime$ mixing. The parameters of the two mixing angle scheme are
extracted from the data for form factors, two photon decay widths and radiative
$J/\psi$ decays. The $\chi^2$ analysis gives the result:
$f_{\eta_1}=(1.16\pm0.06)f_\pi, f_{\eta_8}=(1.33\pm0.23)f_\pi,
\theta_1=-9^\circ\pm 3^\circ, \theta_8=-21.3^\circ\pm 2.3^\circ$, where
$f_{\eta_{1(8)}}$ and $\theta_{1(8)}$ are the decay constants and the mixing
angles for the singlet (octet) state. In addition, we arrive at a stringent
range for $f_{\eta^\prime}^c:-10$ MeV$\le f_{\eta^\prime}^c\le -4$ MeV.


title: The neutrino puzzle in the light of SNO

abstract:
  SNO's neutral current measurement has added a new piece to the emerging
neutrino physics puzzle. Putting together the presently available experimental
information, an essentially unique picture emerges: The solar neutrino anomaly
is explained by nu_e --> nu_tau oscillations, the atmospheric neutrino anomaly
is explained by nu_{mu} --> nu_s and the LSND data are explained by nu_e -->
nu_{mu}. This scheme will be tested by future experiments: MiniBooNE will test
the oscillation explanation of the LSND anomaly, while the long baseline
experiments will discriminate between the nu_{mu} --> nu_s and nu_{mu} -->
nu_{tau} possibilities for resolving the atmospheric anomaly (confirming or
disconfirming the Super-Kamiokande result that the latter is favoured over the
former).


title:
Classification and one loop renormalization of dimension six and eight
  operators in quantum gluodynamics

abstract:
  We determine the complete set of independent dimension six and eight Lorentz
scalar operators in Yang-Mills theory for an arbitrary colour group. The
anomalous dimension mixing matrix is determined at one loop.


title:
Deviation from standard QED at large distances: influence of transverse
  dimensions of colliding beams on bremsstrahlung

abstract:
  The radiation at collision of high-energy particles is formed over a rather
long distances and therefore is sensitive to an environment. In particular the
smallness of the transverse dimensions of the colliding beams leads to
suppression of bremsstrahlung cross section for soft photons. This beam-size
effect was discovered and investigated at INP, Novosibirsk around 1980. At that
time an incomplete expression for the bremsstrahlung spectrum was calculated
and used because a subtraction associated with the extraction of pure
fluctuation process was not performed. Here this procedure is done. The
complete expression for the spectral-angular distribution of incoherent
bremsstrahlung probability is obtained. The case of Gaussian colliding beams is
investigated in details. In the case of flat beams the expressions for the
bremsstrahlung spectrum are simplified essentially. Comparison of theory with
VEPP4 and HERA data is performed. Possible application of the effect to linear
$e^+e^-$ collider tuning is discussed.


title:
The charm contribution into the proton structure function in DIS at the
  HERA ep-collider

abstract:
  In the framework of perturbative QCD and a model for the production of
charmed hadrons the structure function $F^c_2$ is calculated and compared with
the experimental data of H1 and ZEUS Collaborations. We show that the spectator
mechanism of the $D^*$-meson production independent of a hadronic remnant is
valid at $p_T>10$ GeV, only. We find that the evolution of $F^c_2(x,Q^2)$
versus the virtuality $Q^2$ can be neglected in the kinematic region of HERA.


title:
Massive c\bar c g - Calculation in Diffractive DIS and Diffractive D^* -
  Production at HERA

abstract:
  We calculate the cross section for $c\bar{c}g$-production in diffractive DIS
with finite quark masses at zero momentum transfer $t$. The calculation is done
in the leading log(1/$x_{P}$) approximation and is valid in the region of high
diffractive masses $M$ (small $\beta$). We apply our cross section formula
including both $c{\bar c}$- and $c\bar{c}g$ in a Monte Carlo simulation to
diffractive $D^{*\pm}$ meson production at HERA. We compare our predictions to
results of H1 using three parameterizations for the unintegrated gluon density.


title: Reheating as a surface effect

abstract:
  We describe a new mechanism for reheating the Universe through evaporation of
a surface charge of a fragmented inflaton condensate. We show that for a range
of Yukawa coupling of the inflaton to the matter sector evaporation gives rise
to a much smaller reheat temperature compared to the standard perturbative
decay. As a consequence, reheating through a surface effect could solve the
gravitino and moduli over production problem in inflationary models without
fine tuning the Yukawa sector.


title: Experimental Constraints on the Neutralino-Nucleon Cross Section

abstract:
  In the light of recent experimental results for the direct detection of dark
matter, we analyze in the framework of SUGRA the value of the
neutralino-nucleon cross section. We study how this value is modified when the
usual assumptions of universal soft terms and GUT scale are relaxed. In
particular we consider scenarios with non-universal scalar and gaugino masses
and scenarios with intermediate unification scale. We also study superstring
constructions with D-branes, where a combination of the above two scenarios
arises naturally. In the analysis we take into account the most recent
experimental constraints, such as the lower bound on the Higgs mass, the $b\to
s\gamma$ branching ratio, and the muon $g-2$.


title: Quark-quark correlations and baryon electroweak observables

abstract:
  The simple independent quark models have difficulties explaining
simultaneously the totality of the known hyperon magnetic moments and hyperon
semi-leptonic decay rates. We show that both the Goldstone boson loop
contributions and the two-quark effective exchange currents are essential in
explaining these observables.


title: Majorana Mass Zeroes from Triplet VEV without Majoron Problem

abstract:
  It is shown how to obtain recently-proposed two-zero Majorana mass textures
in models with three Higgs triplets with small VEVs and a sufficiently massive
triplet Majoron by using abelian discrete symmetries. It is briefly discussed
how in SU(5) grand unification where the triplets occur in {\bf 15}'s the
neutrino textures can be related to up- and down- quark mass textures.


title: Classical gluodynamics in curved space--time and the soft Pomeron

abstract:
  QCD at the classical level possesses scale invariance which is broken by
quantum effects. This ``dimensional transmutation'' phenomenon can be
mathematically described by formulating classical gluodynamics in a curved,
conformally flat, space-time with non-vanishing cosmological constant. We study
QCD high-energy scattering in this theory. We find that the properties of the
scattering amplitude at small momentum transfer are determined by the energy
density of vacuum fluctuations. The approach gives rise to the power growth of
the total hadron-hadron cross section with energy, i.e. the Pomeron. The
intercept of the Pomeron and the multiplicity of produced particles are
evaluated. We also speculate about a possible link between conformal anomaly
and TeV scale quantum gravity.


title: Anisotropic admixture in color-superconducting quark matter

abstract:
  The analysis of color-superconducting two-flavor deconfined quark matter at
moderate densities is extended to include a particular spin-1 Cooper pairing of
those quarks which do not participate in the standard spin-0 diquark
condensate. (i) The relativistic spin-1 gap Delta' implies spontaneous
breakdown of rotation invariance manifested in the form of the quasi-fermion
dispersion law. (ii) The critical temperature of the anisotropic component is
approximately given by the relation T_c'~ Delta'(T=0)/3. (iii) For massless
fermions the gas of anisotropic Bogolyubov-Valatin quasiquarks becomes
effectively gapless and two-dimensional. Consequently, its specific heat
depends quadratically on temperature. (iv) All collective Nambu-Goldstone
excitations of the anisotropic phase have a linear dispersion law and the whole
system remains a superfluid. (v) The system exhibits an electromagnetic
Meissner effect.


title: Spin Alignment of Vector Meson in High Energy Reactions

abstract:
  The recent data on the polarization of vector meson at LEP show that the
vector mesons favor the helicity zero state. We calculate the helicity density
matrix of vector meson which contains a polarized fragmenting quark by adding
the spin of the fragmenting quark and that of the antiquark created in the
fragmentation. The data at LEP imply a significant polarization for the
antiquark in the opposite direction as that of the fragmenting quark. We extend
the calculations to other reactions and make predictions for vector mesons in
deeply inelastic lepton-nucleon scatterings and polarized $pp$ collisions.


title: Perturbative Saturation and the Soft Pomeron

abstract:
  We show that perturbation theory provides two distinct mechanisms for the
power like growth of hadronic cross sections at high energy. One, the leading
BFKL effect is due to the growth of the parton density, and is characterized by
the leading BFKL exponent. The other mechanism is due to the infrared
diffusion, or the long range nature of the Coulomb field of perturbatively
massless gluons. When perturbative saturation effects are taken into account,
the first mechanism is rendered ineffective but the second one persists. We
suggest that these two distinct mechanisms are responsible for the appearance
of two pomerons. The density growth effects are responsible for the hard
pomeron and manifest themselves in small systems (e.g. gamma^* or small size
fluctuations in the proton wave function) where saturation effects are not
important. The soft pomeron is the manifestation of the exponential growth of
the black saturated regions which appear in typical hadronic systems. We point
out that the nonlinear generalization of the BFKL equation which takes into
account wave function saturation effects ("pomeron loops") provides a well
defined perturbative framework for the calculation of the soft pomeron
intercept. The conjecture of a perturbative soft pomeron is consistent with
picturing the proton as a loosely bound system of several small black regions
corresponding e.g. to constituent quarks of size about 0.3 fm. Phenomenological
implications of this picture are compatible with the main qualitative features
of data on p-p scattering.


title: Neutrinoless Double Beta Decay of 134Xe

abstract:
  In view of recent great progress achieved in the experimental study of the
neutrinoless double beta decay (0nbb-decay) of 134Xe we discuss theoretical
aspects of this process. The light and heavy Majorana neutrino exchange as well
as the trilinear R-parity breaking contributions to 0nbb-decay are considered.
We show that the sensitivity of the studied process to the signal of lepton
number violation is only by factor 2-3 weaker in comparison with the 0nbb-decay
of 136Xe. The current limits on effective neutrino mass (light and heavy) and
trilinear R-parity violating parameter lambda'_111 deduced from lower limits on
the 0nbb-decay half-lifes of various nuclei are reviewed and perspectives of
the experimental verification of recently announced evidence of the 0nbb-decay
of 76Ge are discussed.


title:
Transverse $\tau$ polarization in $B_c \to \tau \bar \nu_{\tau} \gamma $
  decay

abstract:
  The possible transverse polarization of the $\tau$-lepton, which is $T$-odd
and can be used to measure CP-violation, is estimated precisely in the
radiative decay mode $B_c \to \tau \bar \nu_\tau \gamma$ with possible
parameters for the multi Higgs doublet model and the R-parity violating
supersymmetric model. We find that the up-bound of the transverse polarization
with possible parameters in the models is at very different levels i.e. it can
be $\leq 15\sim 23%$ for the former but $\leq 0.1 %$ for the latter, and it is
accessible experimentally soon.


title:
Radiative corrections to single Higgs boson production in $e^+ e^-$
  annihilation

abstract:
  For energies relevant to future linear colliders, $\sqrt{s} \gsim 500$ GeV,
the WW fusion channel dominates the Higgs boson production cross section $e^+
e^- \to \bar{\nu} \nu h^0$. We have calculated the one-loop corrections to this
process due to fermion and sfermion loops in the context of the MSSM. As a
special case, the contribution of the fermion loops in the SM has also been
studied. In general, the correction is negative and sizeable of the order of 10
percent, the bulk of it being due to fermion loops.


title: Phenomenology of Very High Multiplicity Hadron Processes

abstract:
  We discuss the possibility to suppress the nonperturbative effects if the
very high multiplicity hadron final states are chosen. The theoretical
uncertainties and possible experimental measurements are described.


title: Expanding running coupling effects in the hard Pomeron

abstract:
  We study QCD hard processes at scales of order k^2 > Lambda^2 in the limit in
which the beta-function coefficient - b is taken to be small, but alphas(k) is
kept fixed. The (nonperturbative) Pomeron is exponentially suppressed in this
limit, making it possible to define purely perturbative high-energy Green's
functions. The hard Pomeron exponent acquires diffusion and running coupling
corrections which can be expanded in the b parameter and turn out to be
dependent on the effective coupling b alphas^2 Y. We provide a general setup
for this b-expansion and we calculate the first few terms both analytically and
numerically.


title: The radiative return at small angles: virtual corrections

abstract:
  Virtual corrections for electron--positron annihilation into one real and one
off-shell photon of invariant mass Q^2 are evaluated. Special attention is paid
to those configurations where the real photon is collinear with the beam
direction. This calculation is an important ingredient of a Monte Carlo
program, which simulates events with tagged photons from initial-state
radiation, including NLO corrections.


title:
Ultracold neutrons, quantum effects of gravity and the Weak Equivalence
  Principle

abstract:
  We consider an extension of the recent experiment with ultracold neutrons and
the quantization of its vertical motion in order to test the Weak Equivalence
Principle. We show that an improvement on the energy resolution of the
experiment may allow to establish a modest limit to the Weak Equivalence
Principle and on the gravitational screening constant. We also discuss the
influence of a possible new interaction of Nature.


title: Interaction of Wilson loops in confining vacuum

abstract:
  Nonperturbative and perturbative interaction mechanisms of Wilson loops in
gluodynamics are studied within the background field formalism. The first one
operates when distance between minimal surfaces of the loops is small and may
be important for sea quark effects and strong decay processes. The second
mechanism -- perturbative interaction in nonperturbative confining background
is found to be physically dominant for all loop configurations characteristic
of scattering process. It reduces to perturbative gluon exchanges at small
distances, while at larger distances it corresponds to the t-channel exchange
of (reggeized) glueball states.
  Comparison to other approaches is made and possible physical applications are
discussed.


title:
Implications of the first neutral current data from SNO for Solar
  Neutrino Oscillation

abstract:
  We perform model independent and model dependent analyses of solar neutrino
data including the neutral current event rate from SNO. The inclusion of the
first SNO NC data in the model independent analysis determines the allowed
ranges of $^{8}{B}$ flux normalisation and the $\nu_e$ survival probability
more precisely than what was possible from the SK and SNO CC combination. We
perform global $\nu_e-\nu_{active}$ oscillation analyses of solar neutrino data
using the NC rate instead of the SSM prediction for the $^{8}{B}$ flux, in view
of the large uncertainty in the latter. The LMA gives the best solution, while
the LOW solution is allowed only at the $3\sigma$ level.


title: Tunneling transition to the Pomeron regime

abstract:
  We point out that, in some models of small-x hard processes, the transition
to the Pomeron regime occurs through a sudden tunneling effect, rather than a
slow diffusion process. We explain the basis for such a feature and we
illustrate it for the BFKL equation with running coupling by gluon rapidity
versus scale correlation plots.


title: Neutrinos, Grand Unification and Leptogenesis

abstract:
  Data on solar and atmospheric neutrinos provide evidence for neutrino masses
and mixings. We review some basic neutrino properties, the status of neutrino
oscillations and implications for grand unified theories, including
leptogenesis.


title:
Inclusive Distributions for Hadronic Collisions in the
  Valon-Recombination Model

abstract:
  Inclusive distributions of soft production of mesons in hadronic collisions
are calculated in the valon-recombination model. The new determination of the
valon distributions from hard scattering data makes possible a tightly
interrelated treatment of pion and kaon production in the fragmentation regions
of proton, pion and kaon. Only one free parameter is used in the determination
of the valon distribution in the kaon. No other adjustable parameter is needed
to fit the $x$-distributions of the data on inclusive cross sections, except
for the normalizations since the data are at fixed $p_T$. The success of the
model in reproducing seven inclusive distributions suggests that there are two
important mechanisms at work in soft production. One is that the structure of
the hadron that fragments is highly relevant. The other is that the produced
particles are formed by the recombination of quarks and antiquarks. These two
aspects about hadrons in soft processes can be well described in the framework
of the valon-recombination model.


title:
Heavy Quarkonium Spectrum at ${\cal O}(\alpha_s^5m_q)$ and Bottom/Top
  Quark Mass Determination

abstract:
  We present the next-to-next-to-next-to-leading ${\cal O}(\alpha_s^5m_q)$
result for the ground state energy of a heavy quarkonium system. On the basis
of this result we determine the bottom quark mass from $\Upsilon(1S)$ resonance
and provide an explicit formula relating the top quark mass to the resonance
energy in $t\bar t$ threshold production.


title: See-Saw Realization of the Texture Zeros in the Neutrino Mass Matrix

abstract:
  We study the see-saw realization of seven textures of the neutrino mass
matrix, which were presented by Frampton, Glashow and Marfatia. Two of them B_1
and B_2 are not realized in the see-saw mechanism without fine-tuning of
parameters. We present some specific textures of the Dirac neutrino mass matrix
and the right-handed Majorana neutrino one. In order to test these textures, we
discuss the effect on the branching ratio of mu --> e gamma. We also study the
U(1)_X times U(1)_{X'} flavor symmetry, in which U(1)_X is anomalous and
U(1)_{X'} is non-anomolous, to reproduce texture zeros. We present examples of
U(1) charges for two textures A_1 and A_2$.


title: Measuring the Higgs boson's parity using tau --> rho nu

abstract:
  We present a very promising method for a measurement of the Higgs boson
parity using the H/A -> tau^+ tau^- --> rho^+ nu rho^- nu --> pi^+ pi^0 nu pi^-
pi^0 nu decay chain. The method is both model independent and independent of
the Higgs production mechanism. Angular distributions of the tau decay products
which are sensitive to the Higgs boson parity are defined and are found to be
measurable using typical properties of a future detector for an e^+ e^- linear
collider. The prospects for the measurement of the parity of a Higgs boson with
a mass of 120 GeV are quantified for the case of e^+ e^- collisons of 500 GeV
center of mass energy with an integrated luminosity of 500 fb^-1. The Standard
Model Higgsstrahlung production process is used as an example.


title:
Dynamical Solution to Supersymmetric CP Problem with Vanishing B
  Parameter

abstract:
  The CP violation gives rise to severe restriction of soft breaking terms in
supersymmetric standard models. Among them, constraints on the holomorphic soft
mass of Higgs doublets (the B parameter) are difficult to satisfy due to the
other inherent problem in the Higgs potential; the mu problem. In this letter,
it is argued that these CP and mu problems can be rather relaxed provided that
B is vanishing at high-energy scale. A generic mechanism and some examples of
model are presented to dynamically realize this condition by introducing gauge
singlet fields.


title: Introduction to Inflationary Cosmology

abstract:
  The early universe according to the big bang and the grand unified theories
is discussed. The shortcomings of big bang are summarized together with their
resolution by inflationary cosmology. Inflation, the subsequent oscillation and
decay of the inflaton, and the resulting "reheating" of the universe are
studied. The density perturbations produced by inflation and the temperature
fluctuations of the cosmic background radiation are sketched. The hybrid
inflationary model is described. Two "natural" extensions of this model which
avoid the disaster encountered in its standard realization from the
overproduction of monopoles are presented.


title:
Landau's Theoretical Minimum, Landau's Seminar, ITEP in the Beginning of
  the 1950's

abstract:
  I recollect on the organization of the Landau school and describe the early
history of the ITEP Theory Department, as well as the history of creation of
famous Landau, Abrikosov, and Khalatnikov's papers, and Landau's papers on
P-parity violation and CP-conservation. The recollections carry an imprint of
the epoch long gone ..."


title:
Clustering, GUT scale and neutrino masses in Ultrahigh energy cosmic
  rays

abstract:
  We determine the probability that an ultrahigh energy (above 5\cdot 10^{19}
eV) proton created at a distance r with energy E arrives at earth above a
threshold E_c. The clustering of ultrahigh energy cosmic rays suggests that
they might be emitted by compact sources. We present a statistical analysis on
the source density based on the multiplicities. The ultrahigh energy cosmic ray
spectrum is consistent with the decay of GUT scale particles. By using a
maximum likelihood analysis we determine the mass of these GUT scale particles.
We consider the possibility that a large fraction of the ultrahigh energy
cosmic rays are decay products of Z bosons which were produced in the
scattering of ultrahigh energy cosmic neutrinos on cosmological relic
neutrinos. Based on this scenario we determine the required mass of the
heaviest relic neutrino as well as the necessary ultrahigh energy cosmic
neutrino flux via a maximum likelihood analysis.


title: Rare Charm Decays

abstract:
  This paper is a written version of a talk on rare (FCNC) D meson decays as
presented at the Electroweak Moriond 2002. The presentation proceeds in two
parts. We first consider Standard Model predictions, taking into account both
short-distance and long distance effects. Then several New Physics options
(e.g. supersymmatry, strong dynamics, extra large dimenions, etc) are
considered.


title: Unitarity Corrections and Structure Functions

abstract:
  We have studied the color dipole picture for the description of the deep
inelastic process, mainly the structure functions which are driven directly by
the gluon distribution. Estimates for those functions are obtained using the
effective dipole cross section given by the Glauber-Mueller approach in QCD,
encoding the corrections due to the unitarity effects associated with the
saturation phenomenon. Frame invariance is verified in the calculations of the
observables when analysing the experimental data.


title: Heavy Quarkonium Dynamics

abstract:
  An introduction to the recent developments in perturbative heavy quarkonium
physics is given. Covered are the effective theories NRQCD, pNRQCD and vNRQCD,
the threshold expansion, the role of renormalons, and applications to bottom
and top quark physics.


title:
Simple solutions of relativistic hydrodynamics for cylindrically
  symmetric systems

abstract:
  Simple, self-similar, analytic solutions of relativistic hydrodynamics are
presented for cylindrically symmetric, three dimensionally expanding fireballs
corresponding to central collisions of heavy ions at relativistic bombarding
energies.


title: Neutrino Telescopes' Sensitivity to Dark Matter

abstract:
  The nature of the dark matter of the Universe is yet unknown and most likely
is connected with new physics. The search for its composition is under way
through direct and indirect detection. Fundamental physical aspects such as
energy threshold, geometry and location are taken into account to investigate
proposed neutrino telescopes of km^3 volume sensitivities to dark matter. These
sensitivities are just sufficient to test a few WIMP scenarios. Telescopes of
km^3 volume, such as IceCube, can definitely discover or exclude superheavy (M
> 10^10 GeV) Strong Interacting Massive Particles (Simpzillas). Smaller
neutrino telescopes such as ANTARES, AMANDA-II and NESTOR can probe a large
region of the Simpzilla parameter space.


title:
Thermodynamic limit of the canonical partition function with respect to
  the quark number in QCD

abstract:
  We investigate QCD in the canonical ensemble with respect to the quark
number. We reveal that the canonical description in which the quark number is
fixed would be reduced to the grand canonical description under the
thermodynamic limit. Since the grand canonical ensemble contains fluctuations
of the quark number, the idea of the canonical ensemble is of no use for the
purpose of defining order parameters for the deconfinement transition. We
clarify the origin of such reduction and propose an idea to define the order
parameter. The Monte-Carlo simulation by means of the spin system, which is an
effective model of QCD at finite temperature, shows prosperous behaviors though
the results suffer from the severe statistical error due to the sign problem.


title: Probing anomalous right-handed top quark couplings in rare B decays

abstract:
  We explore the anomalous right-handed $\bar{t}sW$ and $\bar{t}bW$ couplings
using $ B \to X_s \gamma$ and $B \to X_s l^+ l^-$ decays induced by the
flavour-changing penguin diagrams. The anomalous $\bar{t}sW$ coupling can yield
10% enhancement of the $B \to X_s l^+ l^-$ decay rate under the constraint from
the present $B \to X_s \gamma$ data, while it does not affect the
forward-backward asymmetry of the charged lepton. The allowed region for
anomalous $\bar{t}bW$ coupling by the $ B \to X_s \gamma$ constraint is
two-fold, the small value region and the large value region. Though the effect
of the small anomalous coupling on the $B \to X_s l^+ l^-$ branching ratio is
very little, it can yield a substantial chanhge for the forward-backward
asymmetry.


title: Oscillation damping of chiral string loops

abstract:
  Chiral cosmic string loop tends to the stationary (vorton) configuration due
to the energy loss into the gravitational and electromagnetic radiation. We
describe the asymptotic behaviour of near stationary chiral loops and their
fading to vortons. General limits on the gravitational and electromagnetic
energy losses by near stationary chiral loops are found. For these loops we
estimate the oscillation damping time. We present solvable examples of
gravitational radiation energy loss by some chiral loop configurations. The
analytical dependence of string energy with time is found in the case of the
chiral ring with small amplitude radial oscillations.


title: Bounds on neutrino magnetic moment tensor from solar neutrinos

abstract:
  Solar neutrinos with non-zero magnetic moments will contribute to the
electron scattering rates in the Super-Kamiokande experiment. The magnetic
moment scattering events in Super-K can be accommodated in the standard VO or
MSW solutions by a change of the parameter space of mass square difference and
mixing angle-but the shifted neutrino parameters obtained from Super-K will
(for some values of neutrino magnetic moments) become incompatible with the
fits from SNO, Gallium and Chlorine experiments. We compute the upper bounds on
the Dirac and Majorana magnetic moments of solar neutrinos by simultaneously
fitting all the observed solar neutrino rates. The bounds the magnetic moment
matrix elements are of the order of 10^{-10} Bohr magnetron.


title: Cabibbo Allowed D -> K pi gamma Decays

abstract:
  The weak radiative Cabibbo allowed decays D^+ -> anti K^0 pi^+ gamma and D^0
-> K^- pi^+ gamma with nonresonant K pi are investigated by relying on the
factorization approximation for the nonleptonic weak transitions and the model
which combines the heavy quark effective theory and the chiral Lagrangian
approach. The dominant contributions to the amplitudes come from the long
distance effects. The decay amplitude has both parity violating and parity
conserving parts. The parity violating part includes also a bremsstrahlung
contribution. The branching ratio obtained for the parity conserving part is of
the order 10^-4 for the D^0 -> K^- pi^+ gamma decay and 10^-5 for the D^+ ->
anti K^0 pi^+ gamma, when the effect of light vector mesons is included, and
smaller otherwise. The branching ratio for the parity violating part with a
photon energy cut of 50 MeV, is close to 10^-3 for the D^0 decay and 4x10^-4
for the D^+ decay. We present Dalitz plots and energy spectra for both
transitions as derived from our model and we probe the role of light vector
mesons in these decays.


title: Baryon number violation, baryogenesis and defects with extra dimensions

abstract:
  In generic models for grand unified theories(GUT), various types of baryon
number violating processes are expected when quarks and leptons propagate in
the background of GUT strings. On the other hand, in models with large extra
dimensions, the baryon number violation in the background of a string is not
trivial because it must depend on the mechanism of the proton stabilization. In
this paper we argue that cosmic strings in models with extra dimensions can
enhance the baryon number violation to a phenomenologically interesting level,
if the proton decay is suppressed by the mechanism of localized wavefunctions.
We also make some comments on baryogenesis mediated by cosmological defects. We
show at least two scenarios will be successful in this direction. One is the
scenario of leptogenesis where the required lepton number conversion is
mediated by cosmic strings, and the other is the baryogenesis from the decaying
cosmological domain wall. Both scenarios are new and have not been discussed in
the past.


title: The Two-Loop Pinch Technique in the Electroweak Sector

abstract:
  The generalization of the two-loop Pinch Technique to the Electroweak Sector
of the Standard Model is presented. We restrict ourselves to the case of
conserved external currents, and provide a detailed analysis of both the
charged and neutral sectors. The crucial ingredient for this construction is
the identification of the parts discarded during the pinching procedure with
well-defined contributions to the Slavnov-Taylor identity satisfied by the
off-shell one-loop gauge-boson vertices; the latter are nested inside the
conventional two-loop self-energies. It is shown by resorting to a set of
powerful identities that the two-loop effective Pinch Technique self-energies
coincide with the corresponding ones computed in the Background Feynman gauge.
The aforementioned identities are derived in the context of the
Batalin-Vilkovisky formalism, a fact which enables the individual treatment of
the self-energies of the photon and the $Z$-boson. Some possible
phenomenological applications are briefly discussed.


title: Relativistic Quantum Transport Theory

abstract:
  Relativistic quantum transport theory has begun to play an important role in
the space-time description of matter under extreme conditions of high energy
density in out-of-equilibrium situations. The following introductory lectures
on some of its basic concepts and methods comprise the sections: 1.
Introduction; 2. Aims of transport theory (classical); 3. Quantum mechanical
distribution functions - the density matrix and the Wigner function; 4.
Transport theory for quantum fields; 5. Particle production by classical
fields; 6. Fluid dynamics of relativistic quantum dust.


title: Gluon Correlators in the Kogan-Kovner Model

abstract:
  The Lorentz-invariant gluon correlation functions, corresponding to scalar
and pseudo-scalar glueballs, are calculated for Kogan's and Kovner's
variational ansatz for the pure SU(N) Yang-Mills wavefunctional.
  One expects that only one dynamical mass scale should be present in QCD; the
ansatz generates the expected scale for both glueballs, as well as an
additional scale for the scalar glueball. The additional mass scale must
therefore vanish, or be close to the expected one. This is shown to constrain
the nature of the phase transition in the Kogan-Kovner ansatz.


title: Proton Decay in Minimal Supersymmetric SU(5)

abstract:
  We systematically study proton decay in the minimal supersymmetric SU(5)
grand unified theory. We find that although the available parameter space of
soft masses and mixings is quite constrained, the theory is still in accord
with experiment.


title: The U(1) axial symmetry and the chiral transition in QCD

abstract:
  We discuss the role of the U(1) axial symmetry for the phase structure of QCD
at finite temperature. We expect that, above a certain critical temperature,
also the U(1) axial symmetry will be restored. We will try to see if this
transition has (or has not) anything to do with the usual chiral transition:
various possible scenarios are discussed. In particular, we analyse a scenario
in which the U(1) axial symmetry is still broken above the chiral transitions.
We will show that this scenario can be consistently reproduced using an
effective Lagrangian model. A new order parameter is introduced for the U(1)
axial symmetry.


title: Chiral Born-Infeld Theory: topological spherically symmetrical solitons

abstract:
  Finite-energy topological spherically symmetrical solutions of Chiral
Born-Infeld Theory are studied. Properties of these solution are obtained, and
a possible physical interpretation is also given.


title: Before and After: How has the SNO NC measurement changed things?

abstract:
  We present "Before and After" global oscillation solutions, as well as
predicted "Before and After" values and ranges for ten future solar neutrino
observables (for BOREXINO, KamLAND, SNO, and a generic p-p neutrino detector).
We have performed global analyses using the full SNO day-night energy spectrum
and, alternatively, just the SNO CC and NC rates and the day-night
asymmetry.The ``Before'' case includes all solar neutrino data (and some
theoretical improvements) available prior to April 20, 2002 and the ``After''
case includes, in addition, the new SNO data on the CC, NC, and day-night
asymmetry. The LMA solution is the only currently allowed MSW oscillation
solution at ~99% CL. The LOW solution is allowed only at more than 2.5 sigma,
SMA at 3.7 sigma or 4.7 sigma (depending upon analysis strategy), and pure
sterile oscillations at 4.7sigma. Small mixing angles are ``out''(pure sterile
is ``way out''); MSW with large mixing angles is definitely ``in''. Vacuum
oscillations are allowed at 3 sigma, but not a 2 sigma. Precise maximal mixing
is excluded at 3.2 sigma for MSW solutions and at 2.8 sigma for vacuum
solutions. Most of the predicted values for future observables for the
BOREXINO, KamLAND, and future SNO measurements are changed only by minor
amounts by the inclusion of the recent SNO data. In order to test the
robustness of the allowed neutrino oscillation regions and the predictions for
future observables, we have carried out calculations using a variety of
strategies to analyze the SNO and other solar neutrino data.


title: Heterotic Orbifolds

abstract:
  A review of orbifold geometry is given, followed by a review of the
construction of four-dimensional heterotic string models by compactification on
a six-dimensional Z_3 orbifold. Particular attention is given to the details of
the transition from a classical theory to a first-quantized theory.
Subsequently, a discussion is given of the systematic enumeration of all
standard-like three generation models subject to certain limiting conditions.
It is found that the complete set is described by 192 models, with only five
possibilities for the hidden sector gauge group. It is argued that only four of
the hidden sector gauge groups are viable for dynamical supersymmetry breaking,
leaving only 175 promising models in the class. General features of the spectra
of matter states in all 175 models are discussed. Twenty patterns of
representations are found to occur. Accomodation of the Minimal Supersymmetric
Standard Model (MSSM) spectrum is addressed. States beyond those contained in
the MSSM and nonstandard hypercharge normalization are shown to be generic,
though some models do allow for the usual hypercharge normalization found in
SU(5) embeddings of the Standard Model gauge group. Only one of the twenty
patterns of representations, comprising seven of the 175 models, is found to be
without an anomalous U(1). Various quantities of interest in effective
supergravity model building are tabulated for the set of 175 models. String
scale gauge coupling unification is shown to be possible, albeit contrived, in
an example model.


title: The QCD/SM Working Group: Summary Report

abstract:
  This Report documents the results obtained by the Working Group on Quantum
ChromoDynamics and the Standard Model for the Workshop ``Physics at TeV
Colliders'', Les Houches, France, 21 May - 1 June 2001. The account of
uncertainties in Parton Distribution Functions is reviewed. Progresses in the
description of multiparton final states at Next-to-Leading Order and the
extension of calculations for precision QCD observables beyond this order are
summarized. Various issues concerning the relevance of resummation for
observables at TeV colliders is examined. Improvements to algorithms of jet
reconstruction are discussed and predictions for diphoton and photon pi-zero
production at the LHC are made for kinematic variables of interest regarding
searches for a Higgs boson decaying into two photons. Finally, several
improvements implemented in Monte-Carlo event generators are documented.


title:
LMA Solution to the Solar Neutrino Problem and a Phenomenological
  Charged Lepton Mass Matrix

abstract:
  We propose a phenomenological form of the charged lepton mass matrix, which
extends the idea of ``lopsided'' mass matrix in the literature. The features of
the form are that both the 2-3 and 1-3 elements of the charged lepton mass
matrix are of order 1 and that the small elements have a new structure . This
form leads to an interesting result that both large atmospheric and solar
neutrino mixing can be accounted for by the matrix. Another interesting result
of this mass matrix is that it leads to very small 1-3 mixing in the lepton
sector and can suppress the branching ratio of $\mu\to e\gamma$ under the
present experimental limit in the supersymmetric see-saw case.


title:
Longitudinal polarization of hyperons in high $p_\perp$ jets in singly
  polarized pp collisions at high energies

abstract:
  We calculate the longitudinal polarizations of hyperons in high $p_\perp$
jets in $pp$ collisions in which one of the protons is longitudinally polarized
at RHIC energies using different models for the spin transfer in fragmentation
process. The results show that the measurements of these polarizations can be
used to study the spin transfer in high energy fragmentation processes in
general and to test the different models in particular. Our results show
especially that the magnitude of the polarization of $\Lambda$ is rather small
whereas that of $\Sigma^+$ is considerably larger in the large rapidity region.
The differences between the results from different pictures for $\Sigma^+$
polarizations is also much larger. Hence, the measurement of $\Sigma^+$
polarization should be more effective to distinguish between different models
especially the SU(6) or the DIS picture for spin transfer in fragmentation
processes.


title:
Transient domain walls and lepton asymmetry in the Left-Right symmetric
  model

abstract:
  It is shown that the dynamics of domain walls in Left-Right symmetric models,
separating respective regions of unbroken SU(2)_L and SU(2)_R in the early
universe, can give rise to baryogenesis via leptogenesis. Neutrinos have a
spatially varying complex mass matrix due to CP-violating scalar condensates in
the domain wall. The motion of the wall through the plasma generates a flux of
lepton number across the wall which is converted to a lepton asymmetry by
helicity-flipping scatterings. Subsequent processing of the lepton excess by
sphalerons results in the observed baryon asymmetry, for a range of parameters
in Left-Right symmetric models.


title: The doubly heavy baryons in the nonperturbative QCD approach

abstract:
  We present some piloting calculations of the masses of the doubly heavy
baryons in the framework of the simple approximation within the nonperturbative
string approach. The simple analytical results for dynamical masses of heavy
and light quarks and eigenvalues of the effective QCD Hamiltonian are
presented.


title:
Continuity of generalized parton distributions for the pion virtual
  Compton scattering

abstract:
  We discuss a consistent treatment of the light-front gauge-boson and meson
wave functions in the analyses of the generalized parton distributions(GPDs)
and the scattering amplitudes in deeply virtual Compton scattering(DVCS) for
the pion. The continuity of the GPDs at the crossover, where the longitudinal
momentum fraction of the probed quark is same with the skewedness parameter,
and the finiteness of the DVCS amplitude are ensured if the same light-front
radial wave function as that of the meson bound state wave function is used for
the gauge boson bound state arising from the pair-creation(or nonvalence)
diagram. The frame-independence of our model calculation is also guaranteed by
the constraint from the sum rule between the GPDs and the form factors.