title: Lepton number violating processes and Majorana neutrinos

abstract:
  We discuss some generic properties of lepton number violating (\Lv) processes
and their relation to different entries of the Majorana neutrino mass matrix.
Present and near future experiments searching for these processes, except the
neutrinoless double beta decay, are unable to probe light(eV mass region) and
heavy(hundred GeV mass region) neutrinos. On the other hand due to the effect
of a resonant enhancement, some of \Lv decays can be very sensitive to the
intermediate mass neutrinos with typical masses in hundred MeV region. These
neutrinos may appear as admixtures of the three active and an arbitrary number
of sterile neutrino species. We analyze the experimental constraints on these
massive neutrino states and discuss their possible cosmological and
astrophysical implications.


title: Can the Lambda pi scattering phase shifts be large?

abstract:
  Motivated by the presence of nearby thresholds in other baryon-meson channels
with I=1 and S=-1, we investigate whether the Lambda pi scattering phase shifts
at a center-of-mass energy equal to the Xi mass could be larger than suggested
by lowest-order chiral perturbation theory. Within a coupled-channel K-matrix
approach, we find that the S-wave phase shift could be as large as -7 degrees.


title: Models for the Polarized Parton Distributions of the Nucleon

abstract:
  Polarized deep inelastic scattering (DIS) data are analyzed in leading and
next-to-leading order of QCD within the common `standard' scenario of polarized
parton distributions with a flavor-symmetric light sea (antiquark) distribution
$\delta\bar{q}$, and a completely SU(3)$_f$ broken `valence' scenario with
totally flavor-asymmetric light sea densities
$(\delta\bar{u}\neq\delta\bar{d}\neq\delta\bar{s})$. The latter flavor-broken
light sea distributions are modelled with the help of a Pauli-blocking ansatz
at the low radiative/dynamical input scales of $\mu_{\rm LO(NLO)}^2=0.26$
(0.40) GeV$^2$ which complies with predictions of the chiral quark-soliton
model and expectations based on the statistical parton model as well as with
the corresponding, well established, flavor-broken unpolarized sea
($\bar{d}>\bar{u}$). Present semi-inclusive DIS data cannot yet uniquely
discriminate between those two flavor-symmetric and flavor-broken polarized
light sea scenarios.


title: Neutralino Warm Dark Matter

abstract:
  In the supersymmetric (SUSY) standard model, the lightest neutralino may be
the lightest SUSY particle (LSP), and it is is a candidate of the dark matter
in the universe. The LSP dark matter might be produced by the non-thermal
process such as heavy particle decay after decoupling of the thermal relic LSP.
If the produced LSP is relativistic, and does not scatter enough in the thermal
bath, the neutralino LSP may contribute as the warm dark matter (WDM) to wash
out the small scale structure of O(0.1) Mpc. In this letter we calculate the
energy reduction of the neutralino LSP in the thermal bath and study whether
the LSP can be the WDM. If temperature of the production time T_I is smaller
than 5MeV, the bino-like LSP can be the WDM and may contribute to the
small-scale structure of O(0.1) Mpc. The Higgsino-like LSP might also work as
the WDM if T_I< 2MeV. The wino-like LSP cannot be the WDM in the favoured
parameter region.


title: Democratic Neutrino Mixing and Radiative Corrections

abstract:
  The renormalization effect on a specific ansatz of lepton mass matrices,
arising naturally from the breaking of flavor democracy for charged leptons and
that of mass degeneracy for light neutrinos, is studied from a superhigh energy
scale M_0 \sim 10^{13} GeV to the electroweak scale in the framework of the
minimal supersymmetric standard model. We find that the democratic neutrino
mixing pattern obtained from this ansatz may in general be instable against
radiative corrections. With the help of similar flavor symmetries we prescribe
a slightly different scheme of lepton mass matrices at the scale M_0, from
which the democratic mixing pattern of lepton flavors can be achieved, after
radiative corrections, at the experimentally accessible scales.


title:
A Comparison of the Momentum Spectra in Deep Inelastic Scattering with
  the Modified Leading Logarithmic Approximation

abstract:
  The evolution of the logarithmic scaled energy spectra with energy scale, in
the framework of the modified leading logarithmic approximation (MLLA), is
investigated. The behaviour of the higher order moments of HERA deep inelastic
scattering data are compared with the analytic predictions of MLLA.


title: Initial Condition for QGP Evolution from NEXUS

abstract:
  We recently proposed a new approach to high energy nuclear scattering, which
treats the initial stage of heavy ion collisions in a sophisticated way.
  We are able to calculate macroscopic quantities like energy density and
velocity flow at the end of this initial stage, after the two nuclei having
penetrated each other.
  In other words, we provide the initial conditions for a macroscopic treatment
of the second stage of the collision.
  We address in particular the question of how to incorporate the soft
component properly. We find almost perfect "Bjorken scaling": the rapidity
coincides with the space-time rapidity, whereas the transverse flow is
practically zero. The distribution of the energy density in the transverse
plane shows typically a very "bumpy" structure.


title: Diffraction 2000: New Scaling Laws in Shadow Dynamics

abstract:
  New scaling structure for the shadow corrections in elastic scattering from
deuteron at high energies has been presented and discussed. It is shown that
this structure corresponds to the experimental data on
proton(antiproton)-deuteron total cross sections. The effect of weakening for
the inelastic screening at superhigh energies has been theoretically predicted.


title: Hadronic Corrections at O(alpha^2) to the Energy Spectrum of Muon Decay

abstract:
  We consider the impact of O(alpha^2) hadronic corrections to the energy
spectrum of the decay electron in muon decay. We find that the correction can
be described, within good approximation, by a linear function in the electron
energy. Explicit expressions for the form factors needed in an approach based
on dispersion integrals are given.


title:
One-loop Singular Behaviour of QCD and SUSY QCD Amplitudes with Massive
  Partons

abstract:
  We discuss the structure of infrared and ultraviolet singularities in
on-shell QCD and supersymmetric QCD amplitudes at one-loop order. Previous
results, valid for massless partons, are extended to the case of massive
partons. Using dimensional regularization, we present a general factorization
formula that controls both the singular epsilon-poles and the logarithmic
contributions that become singular for vanishing masses. We introduce
generalized Altarelli--Parisi splitting functions and discuss their relations
with the singular terms in the amplitudes. The dependence on the regularization
scheme is also considered.


title: On the Dual Standard Model's Structure and some Related Toy models

abstract: Withdrawn; note hep-th/0110236 covers some similar material.


title:
Looking for Instanton-induced Processes at HERA Using a Multivariate
  Technique Based on Range Searching

abstract:
  We present a method to discriminate instanton-induced processes from standard
DIS background based on Range Searching. This method offers fast and automatic
scanning of a large number of variables for a combination of variables giving
high signal to background ratio and the smallest theoretical and experimental
uncertainties.


title: Strangeness Content in the Nucleon

abstract:
  I review recent studies of strangeness content in the nucleon pertaining to
the flavor-singlet $g_A^0$, the $\bar{s}s$ matrix element and the strangeness
electric and magnetic form factors $G_E^s(q^2)$ and $G_M^s(q^2)$, based on
lattice QCD calculations. I shall also discuss the relevance of incorporating
the strangeness content in nuclei in regard to strange baryon-antibaryon
productions from proton-nucleus and nucleus-nucleus collisions at SPS and RHIC
energies.


title: The Time Dependence of B0->f Decays

abstract:
  We calculate the time dependence of B0->f decays (and analogously D0->f
decays) and use this result to obtain expressions for the time dependence of:
an untagged sample (B0->f and Bbar->f decays combined), a sample containing
charge-conjugate final states (B0->f and B0->fbar decays combined), and a
sample containing all four decay modes together. For simplicity we assume CP
violating effects are negligible.


title: Emergence of Classicality in Quantum Phase Transitions

abstract:
  We show that classicality emerges during quantum phase transitions due to
parametric interactions without coupling to environments. The Wigner functions
are explicitly calculated for the Gaussian vacuum, number, and thermal states
of a free scalar field that describes the spinodal instability regime. The
Wigner functions are sharply peaked around their classical trajectories during
the phase transition and exhibit classical correlation only for unstable long
wavelength modes but retain quantum coherence for short wavelength modes. Thus
classicality emerges from the quantum evolution of phase transitions without a
classical order parameter. We define a quantal ordering parameter that is
linear in the field variable and satisfies the classical field equation.

categories: hep-ph cond-mat.stat-mech hep-th nucl-th


title:
Systematics of Large Axial Vector Meson Production in Heavy Flavor Weak
  Decays

abstract:
  Branching ratios observed for $D$ and B decays to final states
$a_1(1260)^{\pm} X$ are comparable to those for corresponding decays to
$\pi^{\pm} X$ and $\rho^{\pm} X$ and much larger than those for all other
decays. Implications are discussed of a "vector-dominance model" in which a $W$
is produced and immediately turns into an axial vector, vector or pseudoscalar
meson. Data for decays to all such final states are shown to have large
branching ratios and satisfy universality relations. Upper limits on small
strong phase differences between amplitudes relevant to CP violation models are
obtained from analysis of the predicted and observed suppression of $B^o$
decays into neutral final states $\pi^o X^o$, $\rho^oX^o$ and $a_1^o X^o$. .
Branching ratios of $\approx 1%$ are predicted for the as yet unobserved
presence of the $D_{s1}(2536)$ charmed-strange axial vector in B decays.


title:
The superfluid phases of quark matter: Ginzburg-Landau theory and color
  neutrality

abstract:
  We apply Ginzburg-Landau theory to determine BCS pairing in a
strongly-coupled uniform superfluid of three-flavor massless quarks in flavor
equilibrium. We elucidate the phase diagram near the critical temperature in
the space of the parameters characterizing the thermodynamic potential terms of
fourth order in the pairing gap. Within the color and flavor antisymmetric
channel with zero total angular momentum, the phase diagram contains an
isoscalar (IS) color-antitriplet phase and a color-flavor-locked (CFL) phase,
reached by a second order transition from the normal state, as well as states
reached by a first order transition. We complement the general Ginzburg-Landau
approach by deriving the high-density asymptotic form of the Ginzburg-Landau
free energy from the weak-coupling gap equation. The dynamically-screened,
long-range color magnetic interactions are taken into account in solving the
gap equation. We find that in the limit of weak coupling, the IS phase is less
favorable near the transition temperature than the CFL phase. In view of the
fact that deconfined quark matter must be color charge neutral, we incorporate
the constraint of overall color neutrality into the Ginzburg-Landau theory and
the gap equation. This constraint yields a disparity in the chemical potential
between colors and reduces the size of the gap, in the presence of the
anisotropy of the order parameters in color space. In comparison with the case
in which there are no chemical potential differences between colors and hence
the superfluid generally has nonzero net color charge, we find that while the
constraint of color neutrality has only negligible effects on the gap in the
weak coupling regime, it appreciably destabilizes the IS phase in the strong
coupling regime without affecting the CFL phase.


title:
Measuring the P-odd Pion-Nucleon Coupling h_{\pi NN}^{(1)} in \pi^+
  Photoproton Production Near the Threshold

abstract:
  We show that polarized gamma p -> \pi^+ n in the threshold region is an
excellent candidate for measuring the leading parity-violating pion-nucleon
coupling h_{\pi NN}^{(1)} to an uncertainty of 20% if it has a natural size
from dimensional analysis. The conclusion is based on a large unpolarized cross
section, a new low-energy theorem for the photon polarization asymmetry at the
threshold A_\gamma|_{th} = \sqrt{2} f_\pi (\mu_p-\mu_n) h_{\pi NN}^{(1)}/g_A
m_N \sim h_{\pi NN}^{(1)}/2, and its strong dominance at forward and backward
angles in the threshold region.


title: CP, T and CPT Symmetries at the Turn of a New Millenium

abstract:
  After summarizing the status concerning CP violation in 1998 I describe the
exciting developments of the last two years and extrapolate to the future. I
comment on recent lessons about T and CPT invariance maninly from CPLEAR and
emphasize the potential of finding New Physics by analyzing $K_{\mu 3}$ and
charm decays and searching for electric dipole moments.


title: Is It Possible to Study the Wave Function of 2S Vector Mesons at HERA ?

abstract:
  We present a short review of anomalous properties in diffractive photo- and
electroproduction of radially excited V'(2S) vector mesons. Using the color
dipole gBFKL phenomenology we analyze anomalous Q^{2} and energy dependence of
the production cross section, V'(2S)/V(1S) production ratio, the diffraction
slope and anomalous t behaviour of the differential cross section d\sigma/dt.
The origin of these anomalies is based on the interplay of the nodal structure
of V'(2S) radial wave function with the energy and dipole size dependence of
the dipole cross section and the diffraction slope. We analyze how a different
pattern of anomalous behaviour of V'(2S) production leads to a different
position of the node in the wave function and discuss how that node position
can be extracted from the data at HERA.


title:
Update of the direct detection of dark matter and the role of the
  nuclear spin

abstract:
  We update our exploration of the MSSM parameter space at the weak scale where
new accelerator and cosmological constraints are respected. The dependence of
WIMP-nucleon cross sections on parameters of the MSSM, uncertainties of the
nucleon structure and other theoretical assumptions like universality and
co-annihilation are considered. In particular, we find that the coannihilation
does not have a significant effect in our analysis in certain regions which are
allowed even with coannihilation. The new cosmological constraint on the relic
neutralino density used in the form $0.1 < \Omega_\chi h^2_0<0.3$ does also not
significantly affect the regions of allowed neutralino-nucleon cross sections.
We notice that for nuclear targets with spin the spin-dependent interaction may
determine the lower bound for the direct detection rate when the cross section
of the scalar interaction drops below about $10^{-12} $pb.


title: Matter profile effect in neutrino factory

abstract:
  We point out that the matter profile effect --- the effect of matter density
fluctuation on the baseline --- is very important to estimate the parameters in
a neutrino factory with a very long baseline. To make it clear, we propose the
method of the Fourier series expansion of the matter profile. By using this
method, we can take account of both the matter profile effect and its
ambiguity. For very long baseline experiment, such as L=7332km, in the analysis
of the oscillation phenomena we need to introduce a new parameter $ a_{1} $---
the Fourier coefficient of the matter profile --- as a theoretical parameter to
deal with the matter profile effects.


title:
Instantaneous Bethe-Salpeter Equation: Analytic Approach for
  Nonvanishing Masses of the Bound-State Constituents

abstract:
  The instantaneous Bethe-Salpeter equation, derived from the general
Bethe-Salpeter formalism by assuming that the involved interaction kernel is
instantaneous, represents the most promising framework for the description of
hadrons as bound states of quarks from first quantum-field-theoretic
principles, that is, quantum chromodynamics. Here, by extending a previous
analysis confined to the case of bound-state constituents with vanishing
masses, we demonstrate that the instantaneous Bethe-Salpeter equation for
bound-state constituents with (definitely) nonvanishing masses may be converted
into an eigenvalue problem for an explicitly - more precisely, algebraically -
known matrix, at least, for a rather wide class of interactions between these
bound-state constituents. The advantages of the explicit knowledge of this
matrix representation are self-evident.


title: SUSY at the Linear Colliders: Working Group Summary

abstract:
  I summarise the activities of the different members of the SUSY working
group. There have been two major areas of activity: 1) precision measurement of
the SUSY particle masses/couplings and hence those of the SUSY model
parameters, 2) investigations into SUSY searches at \eplem, \gamgam, $\game$
and $\emem$ colliders, in the nonstandard scenarios such as explicit CP
violation, R-parity violation and Anomaly Mediated Supersymmtery Breaking. In
addition there have been studies which looked at the effect of `large' extra
dimensions at the various colliders mentioned above.


title: Physics potential of the LHC

abstract:
  The basic aim of physics studies at the LHC is to unravel the mechanism
responsible for the spontaneous symmetry breaking in the Standard Model (SM).
  In the currently accepted theoretical picture, this translates into finding
`direct' experimental evidence for the Higgs sector. TeV scale supersymmetry
(SUSY) provides a very attractive solution to the `naturalness' problem that
theories with elementary scalar fields have. Hence in this talk I will
summarise the physics potential of the LHC for searching for Higgs and
Supersymmetry as well as for measurement of the parameters of the Higgs sector
and the SUSY model. Theories with localised gravity (and large extra
dimensions) give a credible option to have Standard Model without the attendant
`naturalness' problems. I will therefore also summarise the potential of LHC to
probe these `large' extra dimensions.


title: $B\to \pi \rho$, $\pi \omega$ Decays in Perturbative QCD Approach

abstract:
  We calculate the branching ratios and CP asymmetries for $B^0 \to
\pi^+\rho^-$, $B^0 \to \rho^+\pi^-$, $B^+ \to \rho^+\pi^0$, $B^+ \to
\pi^+\rho^0$, $B^0 \to \pi^0\rho^0$, $B^+ \to \pi^+\omega$ and $B^0 \to
\pi^0\omega$ decays, in a perturbative QCD approach. In this approach, we
calculate non-factorizable and annihilation type contributions, in addition to
the usual factorizable contributions. Our result is in agreement with the
measured branching ratio of $B^0/\bar B^0 \to \pi^\pm\rho^\mp$, $B^\pm \to
\pi^\pm\rho^0$, $\pi^\pm \omega$ by CLEO and BABAR collaboration. We also
predict large CP asymmetries in these decays. These channels are useful to
determine the CKM angle $\phi_2$.


title:
Vector-to-Pseudoscalar and Meson-to-Baryon Ratios in Hadronic Z Decays
  at LEP

abstract:
  Mass dependences of the total production rates per hadronic Z decay of all
light-flavour hadrons measured so far at LEP are extrapolated to the zero mass
limit (m=0) using phenomenological laws of hadron production related to the
spin, isospin, strangeness content and mass of the particles. The
vector-to-pseudoscalar and meson-to-baryon ratios at m=0 are found to be: rho^+
/ 3 pi^+ = 1.2 +/- 0.3 and pi^+ / p = 2.9 +/- 0.3, in good agreement with the
predictions of quark combinatorics.


title:
Probing the violation of equivalence principle at a muon storage ring
  via neutrino oscillation

abstract:
  We examine the possible tests of violation of the gravitational equivalence
principle (VEP) at a muon storage ring via neutrino oscillation experiments. If
the gravitational interactions of the neutrinos are not diagonal in the flavour
basis and the gravitational interaction eigenstates have different couplings to
the gravitational field, this leads to the neutrino oscillation. If one starts
with $\mu ^+$ beam then appearance of $\tau ^\pm$, $e ^+$ and $\mu ^-$ in the
final state are the signals for neutrino oscillation. We have estimated the
number of $\mu ^-$ events in this scenario in $\nu_\mu -N$ deep inelastic
scattering. Final state lepton energy distribution can be used to distinguish
the VEP scenario from the others. A large area of VEP parameter space can be
explored at a future muon storage ring facility with moderate beam energy.


title: Nonlinear Gluon Evolution in the Color Glass Condensate: I

abstract:
  We consider a nonlinear evolution equation recently proposed to describe the
small-$x$ hadronic physics in the regime of very high gluon density. This is a
functional Fokker-Planck equation in terms of a classical random color source,
which represents the color charge density of the partons with large $x$. In the
saturation regime of interest, the coefficients of this equation must be known
to all orders in the source strength. In this first paper of a series of two,
we carefully derive the evolution equation, via a matching between classical
and quantum correlations, and set up the framework for the exact background
source calculation of its coefficients. We address and clarify many of the
subtleties and ambiguities which have plagued past attempts at an explicit
construction of this equation. We also introduce the physical interpretation of
the saturation regime at small $x$ as a Color Glass Condensate. In the second
paper we shall evaluate the expressions derived here, and compare them to known
results in various limits.


title: Shadowing Effects on Vector Boson Production

abstract:
  We explore how nuclear modifications to the nucleon structure functions,
shadowing, affect massive gauge boson production in heavy ion collisions at
different impact parameters. We calculate the dependence of $Z^0$, $W^+$ and
$W^-$ production on rapidity and impact parameter to next-to-leading order in
Pb+Pb collisions at 5.5 TeV/nucleon to study quark shadowing at high $Q^2$. We
also compare our Pb+Pb results to the $pp$ rapidity distributions at 14 TeV.


title: O'Mega: An Optimizing Matrix Element Generator

abstract:
  I sketch the architecture of O'Mega, a new optimizing compiler for tree
amplitudes in quantum field theory. O'Mega generates the most efficient code
currently available for scattering amplitudes for many polarized particles in
the standard model. A complete infrastructure for physics beyond the standard
model is provided.


title: Top Physics

abstract:
  The Run I experiments at the Fermilab Tevatron Collider discovered the top
quark and provided first measurements of many of its properties. Run II (and
eventually the LHC and NLC experiments) promise to extend our knowledge of the
top quark significantly. Understanding the top quark's large mass, and indeed
the origin of all mass, appears to require physics beyond the Standard Model.
Thus, the top quark may have unusual properties accessible to upcoming
experiments.


title: Four-Neutrino Oscillations at SNO

abstract:
  We discuss the potential of SNO to constraint the four-neutrino mixing
schemes favoured by the results of all neutrino oscillations experiments. These
schemes allow simultaneous transitions of solar $\nu_e's$ into active
$\nu_\mu$'s, $\nu_\tau$'s and sterile $\nu_s$ controlled by the additional
parameter $\cos^2(\vartheta_{23}) \cos^2(\vartheta_{24})$ and they contain as
limiting cases the pure $\nu_e$-active and $\nu_e$-sterile neutrino
oscillations. We first obtain the solutions allowed by the existing data in the
framework of the BP00 standard solar model and quantify the corresponding
predictions for the CC and the NC/CC event ratios at SNO for the different
allowed regions as a function of the active-sterile admixture. Our results show
that some information on the value of $\cos^2(\vartheta_{23})
\cos^2(\vartheta_{24})$ can be obtained by the first SNO measurement of the CC
ratio, while considerable improvement on the knowledge of this mixing will be
achievable after the measurement of the NC/CC ratio.


title: Hydrodynamics of relativisic systems with broken continuous symmetries

abstract:
  We show how hydrodynamics of relativistic system with broken continuous
symmetry can be constructed using the Poisson bracket technique. We illustrate
the method on the example of relativistic superfluids.


title: Optimizing T-violating Effects for Neutrino Oscillations in Matter

abstract:
  Matter effects may strongly enhance the Jarlskog factor J in T and
CP-violating three-neutrino oscillation probabilities. However, we show that
when J is enhanced, the same matter effects suppress the oscillating factors
and increase the oscillation length. The net result is that there is no large
enhancement in measurable probabilities for earth-bound experiments using
neutrino parameters suggested by current experiments. We show that by an
appropriate choice of the experimental parameters, neutrino energy and travel
length, the T-violating probability can be enhanced by matter effects over
their vacuum values by 50%. Our approach is analytical, allowing considerable
insight into the underlying physics.


title: Testing neutrino mixing at future collider experiments

abstract:
  Low energy supersymmetry with bilinear breaking of R-parity leads to a
weak-scale seesaw mechanism for the atmospheric neutrino scale and a radiative
mechanism for the solar neutrino scale. The model has striking implications for
collider searches of supersymmetric particles. Assuming that the lightest SUSY
particle is the lightest neutralino we demonstrate that (i) The neutralino
decays inside the detector even for tiny neutrino masses. (ii) Measurements of
the neutrino mixing angles lead to predictions for the ratios of various
neutralino branching ratios implying an independent test of neutrino physics at
future colliders, such as the Large Hadron Collider or a Linear Collider.


title: Feynman-Schwinger technique in field theories

abstract:
  In these lectures we introduce the Feynman-Schwinger representation method
for solving nonperturbative problems in field theory. As an introduction we
first give a brief overview of integral equations and path integral methods for
solving nonperturbative problems. Then we discuss the Feynman-Schwinger (FSR)
representation method with applications to scalar interactions. The FSR
approach is a continuum path integral integral approach in terms of covariant
trajectories of particles. Using the exact results provided by the FSR approach
we test the reliability of commonly used approximations for nonperturbative
summation of interactions for few body systems.


title: HTL Resummation of the Thermodynamic Potential

abstract:
  Starting from the Phi-derivable approximation scheme at leading-loop order,
the thermodynamical potential in a hot scalar theory, as well as in QED and
QCD, is expressed in terms of hard thermal loop propagators. This
nonperturbative approach is consistent with the leading-order perturbative
results, ultraviolet finite, and, for gauge theories, explicitly
gauge-invariant. For hot QCD it is argued that the resummed approximation is
applicable in the large-coupling regime, down to almost twice the transition
temperature.


title: Resolving the Solar Neutrino Problem with KamLAND

abstract:
  We study how well KamLAND, the first terrestrial neutrino experiment capable
of addressing the solar neutrino problem, will perform in ascertaining whether
or not the large mixing angle MSW solution (with $10^{-5}<\Delta m_{21}^2<
10^{-4} eV^2$ and oscillation amplitude $sin^2 2 \theta_{12}>0.3$) is correct.
We find that in a year of operation KamLAND will provide unequivocal evidence
for or against this solution. Furthermore, its sensitivity to the
three-neutrino oscillation parameters in this region is sufficiently acute as
to determine $\Delta m_{21}^2$ to approximately $\pm 10$ % (for $sin^2 2
\theta_{12}>0.7$) and to fix $sin^2 2 \theta_{12}$ to within $\pm 0.1$ (at the
$2\sigma$ level) with three years of accumulated data, independent of the value
of $\theta_{13}$.


title: Classical Initial Conditions for Ultrarelativistic Heavy Ion Collisions

abstract:
  We construct an analytical expression for the distribution of gluons in the
state immediately following a heavy ion collision in the quasi-classical limit
of QCD given by McLerran-Venugopalan model. The resulting gluon number
distribution function includes the effects of all multiple rescatterings of
gluons with the nucleons of both colliding nuclei. The typical transverse
momentum k of the produced gluons is shown to be of the order of the saturation
scale of the nuclei Qs, as predicted by Mueller. We analyze the properties of
the obtained distribution and demonstrate that due to multiple rescatterings it
remains finite (up to logarithms of k) in the soft transverse momentum limit of
k << Qs unlike the usual perturbative initial conditions given by collinear
factorization. We calculate the total number of produced gluons and show that
it is proportional to the total number of gluons inside the nuclear wave
function before the collision with the proportionality coefficient c = 2 ln2.


title: Prospect for Searches for Gluinos and Squarks at a Tevatron Tripler

abstract:
  We examine the discovery potential for SUSY new physics at a p{\bar p}
collider upgrade of Tevatron with \sqrt s = 5.4 TeV and luminosity L ~= 4\times
10^{32} cm^{-2}s^{-1} (the Tripler). We consider the reach for gluinos and
squarks using the experimental signatures with large missing transverse energy
(\met) of jets + \met and 1l + jets + \met (where l=electron or muon) within
the framework of minimal supergravity. The Tripler's strongest reach for the
gluino is 1060 GeV for the jets + \met channel and 1140 GeV for the 1l + jets +
\met channel for 30 fb^{-1} of integrated luminosity (approximately two years
running time). This is to be compared with the Tevatron where the reach is
440(460) GeV in the jets + \met channel for 15(30) fb^{-1} of integrated
luminosity.


title:
A Renormalization Group Improved Calculation of Top Quark Production
  near Threshold

abstract:
  The top quark cross section close to threshold in $e^+e^-$ annihilation is
computed including the summation of logarithms of the velocity at
next-to-next-to-leading-logarithmic order in QCD. The remaining theoretical
uncertainty in the normalization of the total cross section is at the few
percent level, an order of magnitude smaller than in previous
next-to-next-to-leading order calculations. This uncertainty is smaller than
the effects of a light standard model Higgs boson.


title: The Standard Model: Physical Basis and Scattering Experiments

abstract:
  We present an introduction into the basic concepts of the Standard Model,
i.e. the gauge theories of the forces and the Higgs mechanism for generating
masses. The Glashow-Salam-Weinberg theory of the electroweak interactions will
be described in detail. The key experiments are reviewed, including the
precision tests at high energies. Finally, the limitations and possible physics
areas beyond the Standard Model are discussed.


title: Basics of QCD Perturbation Theory: TASI 2000

abstract:
  This is an introduction to the use of QCD perturbation theory, emphasizing
generic features of the theory that enable one to separate short-time and
long-time effects. I also cover some important classes of applications:
electron-positron annihilation to hadrons, deeply inelastic scattering, and
hard processes in hadron-hadron collisions.


title: Scaling Violations in the $Q^2$ Logarithmic Derivative of $F_2$

abstract:
  We examine the latest HERA experimental measurements of the $Q^2$ logarithmic
derivative of the proton structure function. We analyze the characteristics of
DGLAP with and without screening, as well as a Regge type model, and compare
their predictions to all available data on $\slope$ including those for fixed
W. Our results show that the present data can be described in pQCD taking into
account shadowing corrections. However, such a description cannot be considered
a conclusive signal of gluon saturation since the experimental data on $\slope$
do not allow one to discriminate between the various approaches, in spite of
their very different construction.


title: Some comments on the missing charm puzzle

abstract:
  In this talk we summarize the status of theoretical predictions for the
average number of charm quarks in a B-hadron decay.


title: Spin Effects In Diffractive Reactions

abstract:
  Double spin asymmetries in the diffractive $Q \bar Q$ and $J/\Psi$
leptoproduction are discussed. It is shown that the asymmetries for
longitudinally polarized lepton and longitudinally or transversely polarized
proton can be used to study spin dependent gluon distribution of the proton at
small $x$.


title:
Left Hand Singularities, Hadron Form Factors and the Properties of the
  Sigma Meson

abstract:
  By applying analyticity and single channel unitarity we derive a new formula
which is useful to analyze the role of the left-hand singularities in hadron
form factors and in the determination of the resonance parameters. Chiral
perturbation theory is used to estimate the left-hand cut effects in $\pi\pi$
scattering processes. We find that in the IJ=11 channel the left-hand cut
effect is negligible and in the IJ=20 channel the phase shift is dominated by
the left-hand cut effect. In the IJ=00 channel the left-hand cut contribution
to the phase shift has the wrong sign comparing with the experimental data and
therefore it necessitates the $\sigma$ resonance. The new experimental results
from the E865 collaboration is crucial in reducing the uncertainty in the
determination of the mass and width of the $\sigma$ resonance within our
scheme.


title: Hybrid Inflation and Supergravity

abstract:
  Hybrid inflation is a natural scenario in the absence of supersymmetry. In
the context of supergravity, however, it has to face the naturalness problems
of the initial conditions and of the adequate suppression of the inflaton mass.
Both can be successfully addressed in a class of models involving Kaehler
potentials associated with products of SU(1,1)/U(1) Kaehler manifolds and
"decoupled" fields acquiring large vacuum expectation values through D-terms.


title: Gravitino creation by an oscillating scalar field

abstract:
  This paper has been withdrawn because the analytic estimates are not
confirmed by the numerical calculation of Nilles, Peloso and Sorbo
(hep-ph/0102264 and hep-th/0103202).


title: Large Neutrino Mixing from Renormalization Group Evolution

abstract:
  The renormalization group evolution equation for two neutrino mixing is known
to exhibit nontrivial fixed point structure corresponding to maximal mixing at
the weak scale. The presence of the fixed point provides a natural explanation
of the observed maximal mixing of $\nu_{\mu}-\nu_{\tau}$ if the $\nu_{\mu}$ and
$\nu_{\tau}$ are assumed to be quasi-degenerate at the seesaw scale without
constraining on the mixing angles at that scale. In particular, it allows them
to be similar to the quark mixings as in generic grand unified theories. We
discuss implementation of this program in the case of MSSM and find that the
predicted mixing remains stable and close to its maximal value, for all
energies below the $O$(TeV) SUSY scale. We also discuss how a particular
realization of this idea can be tested in neutrinoless double beta decay
experiments.


title: Lectures on Technicolor and Compositeness

abstract:
  Lecture 1 provides an introduction to dynamical electroweak symmetry
breaking. Lectures 2 and 3 give an introduction to compositeness, with emphasis
on effective lagrangians, power-counting, and the 't Hooft anomaly-matching
conditions.


title: Hyperons, Charm and Beauty Hadrons: Conclusion and Outlook

abstract:
  In this concluding talk, the advances in the Flavour Problem studies are
discussed, following the structure of the presentations in the Conference. The
subjects touched are organized as follows: Baryons, K-physics, Charm and Beauty
production, Charm and Beauty decays, B-Mixing and CP-Violation, Heavy
Quarkonium.


title:
Semileptonic Form-factors from B-> K* gamma Decays in the Large Energy
  Limit

abstract:
  Making use of the measurement of the $B\to K^*\gamma$ branching ratio
together with the relations following from the limit of high recoil energy, we
obtain stringent constraints on the values of the form-factors entering in
heavy-to-light $B\to V\ell\ell'$ processes such as $B\to K^*\ell^+\ell^-$,
$B\to K^*\nu \bar{\nu}$ and $B\to \rho\ell\nu$ decays. We show that the
symmetry predictions, when combined with the experimental information on
radiative decays, specify a severely restricted set of values for the vector
and axial-vector form-factors evaluated at zero momentum transfer, $q^2=0$.
These constraints can be used to test model calculations and to improve our
understanding of the $q^2$-dependence of semileptonic form-factors. We stress
that the constraints remain stringent even when corrections are taken into
account.


title:
Real Time Nonequilibrium Dynamics of Quantum Plasmas. Quantum Kinetics
  and the Dynamical Renormalization Group

abstract:
  We implement the dynamical renormalization group (DRG) using the hard thermal
loop (HTL) approximation for the real-time nonequilibrium dynamics in hot
plasmas. The focus is on the study of the relaxation of gauge and fermionic
mean fields and on the quantum kinetics of the photon and fermion distribution
functions. As a concrete physical prediction, we find that for a QGP of
temperature T sim 200 MeV and lifetime 10 < t < 50 fm/c there is a new
contribution to the hard (k \sim T) photon production from off-shell
bremsstrahlung (q rightarrow q gamma and bar{q} rightarrow bar{q} gamma) at
just O (alpha) that grows logarithmically in time and is comparable to the
known on-shell Compton scattering and pair annihilation at O(alpha alpha_s).


title: The Landau Pole at Finite Temperature

abstract:
  We study the Landau pole in the lambda phi^4 field theory at non-zero and
large temperatures. We show that the position of the thermal Landau pole
Lambda_L(T) is shifted to higher energies with respect to the zero temperature
Landau pole Lambda_L(0). We find for high temperatures T > Lambda_L(0),
Lambda_L(T) simeq pi^2 T / log (T / Lambda_L(0)). Therefore, the range of
applicability in energy of the lambda phi^4 field theory increases with the
temperature.


title: CKM matrix: the `over-consistent' picture of the unitarity triangle

abstract:
  In presenting an up-to-date account of the experimental knowledge of the CKM
matrix, special emphasis is placed on the exceptional degree of consistency
shown by the current Standard Model determination of the unitarity triangle;
some implications in the question of how the theoretical nature of the dominant
uncertainties affects the Standard Model predictions are discussed. Recent
experimental results include improved determinations of |V_{cb}| by OPAL and
CLEO, the confirmation of rare (charmless hadronic and electromagnetic penguin)
B decays and preliminary sin(2 beta) measurements by BaBar and Belle (new world
average: sin(2 beta) = 0.48 +0.22 -0.24). The updated constraints lead to the
Standard Model predictions sin(2 beta) = 0.68 +/- 0.03(exp) +/- 0.04(th), sin(2
alpha) = -0.43 +/- 0.15(exp) +/- 0.20(th), gamma = 56 +/- 5(exp)(+5 -6)(th)
deg, Delta m_{Bs} = 16.2 (+2.7 -0.3)(exp)(+1.5 -1.0)(th) ps^{-1}.


title: Small-x Resummation and HERA Structure Function Data

abstract:
  We apply our systematic NLO small x resummation of singlet splitting
functions to the scaling violations of structure functions and compare the
results with data. We develop various theoretical tools which are needed in
order to relate resummed parton distributions to measurable structure
functions, and we present results from a variety of fits to HERA data for the
structure functions F_2 and F_L using the resummation. The behaviour of the
singlet splitting functions at small x and fixed Q^2 is effectively
parametrized as x^{-lambda}. We find that, for lambda small or negative, the
resummed description of scaling violations may be phenomenologically as good as
or even better than the standard next-to-leading order treatment. However, the
best fit gluon density and value of alpha_s can be significantly modified by
the resummation.


title: CP-violating ZZh Coupling at e+e- Linear Colliders

abstract:
  We study the general Higgs-weak boson coupling with CP-violation via the
process e+e- -> f \bar f h. We categorize the signal channels by sub-processes
Zh production and ZZ fusion and construct four CP asymmetries by exploiting
polarized e+e- beams. We find complementarity among the sub-processes and the
asymmetries to probe the real and imaginary parts of the CP-violating form
factor. Certain asymmetries with unpolarized beams can retain significant
sensitivity to the coupling. We conclude that at a linear collider with high
luminosity, the CP-odd ZZh coupling may be sensitively probed via measurements
of the asymmetries.


title: Lorentz and CPT Tests in QED

abstract:
  A theoretical framework extending QED in the context of the standard model is
used to analyze a variety of Lorentz and CPT tests in atomic systems.
Experimental signatures of possible Lorentz and CPT violation in these systems
are investigated, and bounds are discussed.


title:
Chromomagnetic Catalysis of Color Superconductivity in a
  (2+1)-dimensional NJL Model

abstract:
  The influence of a constant uniform external chromomagnetic field $H$ on the
formation of color superconductivity has been investigated. The consideration
was performed in the framework of a (2+1)-dimensional Nambu--Jona-Lasinio model
with two different four-fermionic structures responsible for $<\bar qq>$ and
diquark $<qq>$ condensates. In particular, it was shown that there exists a
critical value $H_c$ of the external chromomagnetic field such that at $H>H_c$
a nonvanishing diquark condensate is dynamically created (the so-called
chromomagnetic catalysis effect of color superconductivity). Moreover, external
chromomagnetic fields may in some cases enhance the diquark condensate of color
superconductivity.


title:
Infrared Fixed Point Structure in Minimal Supersymmetric Standard Model
  with Baryon and Lepton Number Violation

abstract:
  We study in detail the renomalization group evolution of Yukawa couplings and
soft supersymmetry breaking trilinear couplings in the minimal supersymmetric
standard model with baryon and lepton number violation. We obtain the exact
solutions of these equations in a closed form, and then depict the infrared
fixed point structure of the third generation Yukawa couplings and the highest
generation baryon and lepton number violating couplings. Approximate analytical
solutions for these Yukawa couplings and baryon and lepton number violating
couplings, and the soft supersymmetry breaking couplings are obtained in terms
of their initial values at the unification scale. We then numerically study the
infrared fixed surfaces of the model, and illustrate the approach to the fixed
points.


title:
Bounds on the Mass and Coupling Constant of Radion in the
  Randall-Sundrum Theory

abstract:
  Assuming the Goldberger-Wise mechanism, we investigated the effective
potential at the one-loop level in the Randall-Sundrum theory. We found the
lower and upper bounds of the radion mass m_\phi and the radion-SM coupling
constant, 0.8 GeV \lesssim m_\phi \lesssim 260 GeV and 1400 GeV \lesssim
\Lambda_\phi \lesssim 1500 GeV for the one-loop level potential. These bounds
were determined from two constraints of warp factor = O(M_W/M_{Pl}) and Higgs
vev \simeq 246 GeV, which can produce strong bounds of m_\phi and \Lambda_\phi.
It is phenomenologically important that the one-loop allowed upper bound of the
radion mass is about five times larger than the tree-level one, but the radion
is still lighter than the Kaluza-Klein modes.


title:
QED Radiative Correction for the Single-W Production using a Parton
  Shower Method

abstract:
  A parton shower method for the photonic radiative correction is applied to
the single W-boson production processes. The energy scale for the evolution of
the parton shower is determined so that the correct soft-photon emission is
reproduced. Photon spectra radiated from the partons are compared with those
from the exact matrix elements, and show a good agreement. Possible errors due
to a inappropriate energy-scale selection or due to the ambiguity of energy
scale determination are also discussed, particularly for the measurements on
triple gauge-couplings.


title: Goldstone boson-nucleon dynamics: Working group summary and outlook

abstract:
  We highlight some of the recent results in chiral dynamics for systems with
one nucleon/baryon presented at Chiral Dynamics 2000. We outline the most
urgent experimental and theoretical challenges to be tackled in the coming
years.


title: Isospin Symmetry Breaking and the $\rho-\omega$-System

abstract:
  Simple quark models for the low lying vector mesons suggest a mixing between
the u- and d-flavors and a violation of the isospin symmetry for the
$\rho-\omega$- system much stronger than observed. It is shown that the chiral
dynamics, especially the QCD anomaly, is responsible for a restoration of the
isospin symmetry in the $\rho-\omega$-system.


title: Cosmic Birefringence within the Framework of Heterotic String Theory

abstract:
  Low energy string theory predicts the existence of an axion field which can
lead to cosmic birefringence. We solve the electromagnetic wave equations in
the presence of such an axion and a dilaton field in order to determine their
effect on the polarization of light. We find that the presence of dilaton field
leads to a nontrivial modification of the final result. We comment on the
possibility of discovering such an effect by observations of radio wave
polarizations from distant radio galaxies and quasars. We have also determined
the limits on the string theory parameters that are imposed by the current
polarization data from distant quasars and radio galaxies.


title: Skewed parton distributions and wide-angle exclusive scattering

abstract:
  The overlap representation of skewed parton distributions is discussed and
applications to wide-angle Compton scattering and electroproduction of mesons
are presented. The amplitudes for these processes factorise into parton-level
subprocess amplitudes and form factors representing 1/x-moments of skewed
parton distributions.


title:
Mapping the proton unintegrated gluon distribution in dijets
  correlations in real and virtual photoproduction at HERA

abstract:
  We discuss how the dijet azimuthal correlations in DIS and real
photoproduction at HERA probe the differential (unintegrated) gluon
distribution in the proton. We find a strong dependence of the azimuthal
correlation pattern on Bjorken-$x$, photon virtuality and the cut on the jet
transverse momenta. A rise of the azimuthal decorrelations is observed with
decreasing Bjorken-x due to the interplay of perturbative and nonperturbative
effects. We predict a strong rise of the same-side jet rate with photon energy
for real photoproduction. We discuss conditions for the correlation function to
be dominated by hard perturbative gluons and ways of constraining the size of
the nonperturbative soft component. We make some predictions for the THERA
energy range. The analysis of the energy dependence of the isolated jet and
two-jet cross sections in photoproduction would be a new way to study the not
yet well constrained unintegrated gluon distributions and to explore the onset
of the pQCD regime.


title: A Toy Model of Colour Screening in the Proton

abstract:
  In hadronic collisions, the mini-jet cross section is formally divergent in
the limit pT -> 0. We argue that this divergence is tamed by some effective
colour correlation length scale of the hadron. A toy model of the hadronic
structure is introduced, that allows an estimate of the screening effects, and
especially their energy dependence.


title: Relaxation of 2+1 dimensional classical O(2) symmetric scalar fields

abstract:
  Real time thermalization and relaxation phenomena are studied in the low
energy density phase of the 2+1 dimensional classical O(2) symmetric scalar
theory by solving numerically its dynamics. The near-equilibrium decay rate of
on-shell waves and the power law governing the large time asymptotics of the
off-shell relaxation agree with the analytic results based on linear response
theory. The realisation of the Mermin-Wagner theorem is also studied in the
final equilibrium ensemble.


title: Baryon wave functions in QCD and integrable models

abstract:
  A new theoretical framework is proposed for the description of baryon
light-cone distribution amplitudes, based on the observation that their scale
dependence to leading logarithmic accuracy is described by a completely
integrable model. The physical interpretation is that one is able to find a new
quantum number that distinguishes partonic components in the nucleon with
different scale dependence.


title: A General MSSM Parameter Scan

abstract:
  The excluded tan(beta) range and Higgs boson mass regions in the framework of
the Minimal Supersymmetric extension of the Standard Model (MSSM) depend on
several parameters. The Higgs boson masses, cross-sections and branching
fractions have been determined including two-loop diagrammatic calculations.
The limits obtained with a more general scan over the parameter space of the
MSSM are compared with those in the so-called benchmark scenario. The
combination of the searches for Higgs particles in the 1999 data collected by
the DELPHI collaboration at center-of-mass energies between 191.6 and 201.7 GeV
allows stringent limits to be set in combination with previous DELPHI results.
In addition, an interpretation in the framework of the general MSSM scan of the
2000 LEP data at the hightest energies between 201.7 and 209.0 GeV is given. We
show that the current data for the HZ and hA production can be comfortably
accommodated in the MSSM.


title:
The Effect of Weak Interactions on the Ultra-Relativistic Bose-Einstein
  Condensation Temperature

abstract:
  We calculate the ultra-relativistic Bose-Einstein condensation temperature of
a complex scalar field with weak lambda Phi^4 interaction. We show that at high
temperature and finite density we can use dimensional reduction to produce an
effective three-dimensional theory which then requires non-perturbative
analysis. For simplicity and ease of implementation we illustrate this process
with the linear delta expansion.


title:
O'Mega & WHIZARD: Monte Carlo Event Generator Generation For Future
  Colliders

abstract:
  I describe the optimizing matrix element generator O'Mega and Wolfgang
Kilian's event generator generator WHIZARD. These tools cooperate in the
automated production of efficient unweighted event generators for linear
collider physics.


title:
Bootstrap quark model and spectra masses, electromagnetic properties of
  low-lying hadrons

abstract:
  The paper is devoted to the construction of low-energy quark scattering
amplitudes. Bootstrap quark model allows to describe the light and heavy hadron
spectroscopy based on three principles: unitarity, analicity and crossing
symmetry. The resulting quark interaction appeared to be effectively
short-range. This interaction is determined mainly by the exchange in the gluon
channel: the constituent-gluon mass appeared to not be small. Our calculation
indicates an important role of an interaction which is induced by instantons.
Such an interaction is necessary for deriving both the pion mass and
$\eta$-$\eta'$ mass splitting. However, due to the rules of $1/N_c$-expansion
this interaction influences slightly the other channels while in the
$\eta$-$\eta'$ channel it provides the correct values of masses and gives the
angle of $\eta_1-\eta_8$ mixture close to that of the quark model. We discuss
the possibility of constructing the amplitudes which take into account the
quark confinement.


title: Threshold Resummation and Rapidity Dependence

abstract:
  We study the effects of threshold resummation on the rapidity dependence of
single-particle-inclusive cross sections, using the prompt photon cross section
as an example. We make use of the full resummation formula at next-to-leading
logarithmic accuracy and develop a new technique for treating rapidity in
resummation. We compare our phenomenological results with those of previous
studies and discuss differences and similarities of the two existing
resummation formalisms.


title: Associated Top-Higgs production at future colliders

abstract:
  We discuss the relevance of the associated production of a Higgs boson with a
pair of top-antitop quarks at both the LHC and a future high energy e^+e^-
collider.


title: Cumulant ratios in fully developed turbulence

abstract:
  In the context of random multiplicative cascade processes, we derive
analytical solutions for one- and two-point cumulants with restored
translational invariance. On taking ratios of cumulants in ln epsilon,
geometrical effects due to spatial averaging cancel out. These ratios can
successfully distinguish between splitting functions while multifractal scaling
exponents and multiplier distributions cannot.


title:
Multiplicity dependence of Bose-Einstein correlations in
  antiproton-proton reactions: a discussion of possible origins

abstract:
  The observed pronounced multiplicity dependence of correlation functions in
hadron-hadron reactions and in particular of Bose-Einstein correlations
provides information about underlying physics. We discuss in this contribution
several interpretations, giving special attention to the string model for
Bose-Einstein correlations of Andersson and Hofmann, as well as the core-halo
picture of Csorgo, Lorstad and Zimanyi.


title: The S-wave \Lambda\pi phase shift is not large

abstract:
  We study the strong interaction S-wave \Lambda\pi phase shift in the region
of the \Xi mass in the framework of a relativistic chiral unitary approach
based on coupled channels. All parameters have been previously determined in a
fit to strangeness S= -1 S-wave kaon-nucleon data. We find 0^\circ \le \delta_0
\le 1.1^\circ in agreement with previous chiral perturbation theory
calculations (or extensions thereof). We also discuss why a recent coupled
channel K-matrix calculation gives a result for \delta_0 that is negative and
much bigger in magnitude. We argue why that value should not be trusted.


title:
Point form relativistic quantum mechanics, antiparticles and exchange
  currents

abstract:
  It is shown that the dynamical observables calculated with the point form
relativistic quantum mechanics incorporate effects of particle-antiparticle
creation from the vacuum by interactions. The electromagnetic observables
obtained with the point form impulse approximation include contributions from
the ``pair'' exchange currents that are associated with the interactions
between particles. This implies that the recently calculated nucleon
electromagnetic formfactors with the chiral constituent quark model
automatically take into account effects of ``pair'' exchange currents that are
associated with the Goldstone boson exchange between the constituent quarks as
well as with the confining interaction.


title: Neutrino Masses and Mixing in Brane-World Theories

abstract:
  We present a comprehensive study of five-dimensional brane-world models for
neutrino physics based on flat compactifications. Particular emphasis is put on
the inclusion of bulk mass terms. We derive a number of general results for
such brane-world models with bulk mass terms. In particular, in the limit of
small brane-bulk couplings, the electroweak eigenstates are predominantly given
as a superposition of three light states with non-trivial small admixtures of
bulk states. As a consequence, neutrinos can undergo standard oscillations as
well as oscillation into bulk Kaluza-Klein states. We use this structure to
construct a specific model based on Z_2 orbifolding and bulk Majorana masses
which is compatible with all observed oscillation phenomena. The solar neutrino
deficit is explained by oscillations into sterile bulk states while the
atmospheric neutrino deficit is due to mu - tau oscillations with naturally
maximal mixing. In addition, the model can accommodate the LSND result and a
significant neutrino dark matter component. We also analyze the constraints
from supernova energy loss on neutrino brane-world theories and show that our
specific model is consistent with these constraints.


title: Neutrino masses through a type II seesaw mechanism at TeV scale

abstract:
  In this work we show that we can generate neutrino masses through the type-II
see-saw mechanism working at TeV scale in the context of a 331 model.


title:
Determining the sign of $\Delta_{31}$ at long baseline neutrino
  experiments

abstract:
  Recently it is advocated that high intensity and low energy $(E_\nu \sim 2
GeV)$ neutrino beams should be built to probe the $(13)$ mixing angle $\phi$ to
a level of a few parts in $10^4$. Experiments using such beams will have better
signal to background ratio in searches for $\nu_\mu \to \nu_e$ oscillations. We
propose that such experiments can also determine the sign of $\Delta_{31}$ even
if the beam consists of {\it neutrinos} only. By measuring the $\nu_\mu \to
\nu_e$ transitions in two different energy ranges, the effects due to
propagation of neutrinos through earth's crust can be isolated and the sign of
$\Delta_{31}$ can be determined. If the sensitivity of an experiment to $\phi$
is $\epsilon$, then the same experiment is automatically sensitive to matter
effects and the sign of $\Delta_{31}$ for values of $\phi \geq 2 \epsilon$.


title: Physics of the Nucleon Sea Quark Distributions

abstract:
  Sea quark distributions in the nucleon have naively been expected to be
generated perturbatively by gluon splitting. In this case, there is no reason
for the light quark and anti-quark sea distributions to be different. No
asymmetries in the strange or heavy quark sea distributions are predicted in
the improved parton model. However, recent experiments have called these naive
expectations into question. A violation of the Gottfried sum rule has been
measured in several experiments, suggesting that $\bar u < \bar d$ in the
proton. Additionally, other measurements, while not definitive, show that there
may be an asymmetry in the strange and anti-strange quark sea distributions.
These effects may require nonperturbative explanations. In this review we first
discuss the perturbative aspects of the sea quark distributions. We then
describe the experiments that could point to nonperturbative contributions to
the nucleon sea. Current phenomenological models that could explain some of
these effects are reviewed.


title: Electron Scattering with Polarized Targets at TESLA

abstract:
  Measurements of polarized electron-nucleon scattering can be realized at the
TESLA linear collider facility with projected luminosities that are about two
orders of magnitude higher than those expected of other experiments at
comparable energies. Longitudinally polarized electrons, accelerated as a small
fraction of the total current in the e+ arm of TESLA, can be directed onto a
solid state target that may be either longitudinally or transversely polarized.
A large variety of polarized parton distribution and fragmentation functions
can be determined with unprecedented accuracy, many of them for the first time.
A main goal of the experiment is the precise measurement of the x- and
Q^2-dependence of the experimentally totally unknown quark transversity
distributions that will complete the information on the nucleon's quark spin
structure as relevant for high energy processes. Comparing their Q^2-evolution
to that of the corresponding helicity distributions constitutes an important
precision test of the predictive power of QCD in the spin sector. Measuring
transversity distributions and tensor charges allows access to the hitherto
unmeasured chirally odd operators in QCD which are of great importance to
understand the role of chiral symmetry. The possibilities of using unpolarized
targets and of experiments with a real photon beam turn TESLA-N into a
versatile next-generation facility at the intersection of particle and nuclear
physics.


title: On the Determination of the Polarized Sea Distributions of the Nucleon

abstract:
  The possibilities to determine the flavor structure of the polarized sea
(antiquark) distributions of the nucleon via vector boson $(\gamma^*, W^{\pm},
Z^0)$ production at high energy polarized hadron--hadron colliders, such as the
Relativistic Heavy--Ion Collider (RHIC), are studied in detail. In particular
the perturbative stability of the expected asymmetries in two representative
models for the (un)broken flavor structure are investigated by confronting
perturbative QCD leading order predictions of the expected asymmetries with
their next--to--leading order counterparts.


title: KNO scaling 30 years later

abstract:
  KNO scaling, i.e. the collapse of multiplicity distributions P_n onto a
universal scaling curve manifests when P_n is expressed as the distribution of
the standardized multiplicity (n-c)/lambda with c and lambda being location and
scale parameters governed by leading particle effects and the growth of average
multiplicity. At very high energies, strong violation of KNO scaling behavior
is observed (p-pbar) and expected to occur (e+e-). This challenges one to
introduce novel, physically well motivated and preferably simple scaling rules
obeyed by high-energy data. One possibility what I find useful and which
satisfies the above requirements is the repetition of the original scaling
prescription (shifting and rescaling) in Mellin space, that is, for the
multiplicity moments' rank. This scaling principle is discussed here,
illustrating its capabilities both on model predictions and on real data.


title: Nuclear structure functions and off-shell corrections

abstract:
  The $n$-th moments of the nuclear structure function $F_2^A(x,Q^2)$ are
analyzed using the off-shell kinematics appropriate to describe deep inelastic
electron-nucleus scattering within the impulse approximation. It is shown that
off-shell effects are sensitive to the form of both the nuclear spectral
function and the nucleon structure function $F_2^N(x,Q^2)$, and can be as large
as $\sim 10%$ at Q$^2~\sim~2$~(GeV/c)$^2$.


title: Exclusive hadronic Tau decays in the resonance effective action of QCD

abstract:
  Until present the study of the form factors associated to the vector and
axial-vector components of the hadronic weak current has been carried out with
a plethora of modelizations of the underlying strong interactions. While of
importance to get an understanding of the dynamics involved, the amount and
quality of the experimental data start to show some discrepancies with the
analysed models. Moreover, and from a theoretical point of view, most of these
models are not consistent with quantum chromodynamics (QCD). We propose a
QCD-based model-independent procedure to analyse those decays through the use
of the resonance chiral theory, the low-energy effective action of QCD in the
relevant resonance region. Within this framework we study the hadronic
off-shell width of the Rho meson and the vector form factor of the pion in
Tau(-) -> Pi(-) Pi(0) nu_tau. We also comment on the Tau(-) -> (Pi Pi Pi)(-)
nu_tau decay.


title: Quark-Gluon Plasma Signatures in Nucleus--Nucleus Collisions at CERN SPS

abstract:
  Two signatures of the quark-gluon plasma -- strangeness `enhancement' and
$J/\psi$ `suppression' -- in nucleus--nucleus collisions at the SPS energies
are critically discussed.


title:
TAUOLA the library for tau lepton decay, and KKMC/KORALB/KORALZ/...
  status report

abstract:
  The status of the Monte Carlo programs for the simulation of the $\tau$
lepton production in high energy accelerator experiments and decay is reviewed.
In particular, the status of the following packages is discussed: (i) TAUOLA
for tau-lepton decay, (ii) PHOTOS for radiative corrections in decays, (iii)
KORALB, KORALZ, KKMC packages for tau-pair production in e+e- collisions and
(iv) universal interface of TAUOLA for the decay of tau-leptons produced
by``any'' generator. Special emphasis on requirements from new and future
experiments is given. Some considerations about the software organization
necessary to keep simultaneously distinct physics initializations for TAUOLA
are also included.


title: Analytical description of quasivacuum oscillations of solar neutrinos

abstract:
  We propose a simple prescription to calculate the solar neutrino survival
probability P_{ee} in the quasivacuum oscillation (QVO) regime. Such
prescription is obtained by matching perturbative and exact analytical results,
which effectively take into account the density distribution in the Sun as
provided by the standard solar model. The resulting analytical recipe for the
calculation of P_{ee} is shown to reach its highest accuracy |\Delta P_{ee}| <
2.6 x 10^{-2} in the whole QVO range) when the familiar prescription of
choosing the solar density scale parameter r_0 at the
Mikheyev-Smirnov-Wolfenstein (MSW) resonance point is replaced by a new one,
namely, when r_0 is chosen at the point of ``maximal violation of
adiabaticity'' (MVA) along the neutrino trajectory in the Sun. The MVA
prescription admits a smooth transition from the QVO regime to the MSW
transition one. We discuss in detail the phase acquired by neutrinos in the
Sun, and show that it might be of relevance for the studies of relatively short
timescale variations of the fluxes of the solar \nu lines in the future
real-time solar neutrino experiments. Finally, we elucidate the role of matter
effects in the convective zone of the Sun.


title:
Non standard analysis of the solar neutrino anomaly (updated including
  the SNO day/night spectral data)

abstract:
  Continuing previous work, a model independent analysis of the solar neutrino
anomaly is performed in terms of neutrino oscillations, allowing a comparison
with the predictions of the Standard Solar Model. SMA and LMA solutions emerge
also in this case, although somewhat different from the standard ones. The
significance of the NC/CC double ratio measurable in SNO is illustrated in this
context.


title:
Fermionic current-carrying cosmic strings: zero-temperature limit and
  equation of state

abstract:
  The equation of state for a superconducting cosmic string whose current is
due to fermionic zero modes is derived analytically in the case where the
back-reaction of the fermions to the background is neglected. It is first shown
that the zero mode fermions follow a zero temperature distribution because of
their interactions (or lack thereof) with the string-forming Higgs and gauge
fields. It is then found that the energy per unit length U and the tension T
are related to the background string mass m through the simple relation
U+T=2m*m. Cosmological consequences are briefly discussed.


title:
Nuclear Effects on the UHE Neutrino-Nucleon Deep Inelastic Scattering
  Cross Section

abstract:
  Using a recent parametrization of nuclear effects in parton distribution
functions we calculate the neutrino-nucleon cross section at energies relevant
for ultra high energy neutrino telescopes. The modification of the cross
section in comparison with the calculation using parton densities in free
nucleons is of the order of few per cent for the parameter range of interest in
neutrino telescopes (A=10 and E=10$^6$ GeV) and it reaches 20 % at the highest
energies (E=10$^{12}$ GeV) and for the largest nuclear size (A=190) considered.


title: Neutrino-Induced Giant Air Showers in Large Extra Dimension Models

abstract:
  In models based on large extra dimensions where massive spin 2 exchange can
dominate at high energies, the neutrino-proton cross section can rise to
typical hadronic values at energies above 10^20 eV. The neutrino then becomes a
candidate for the primary that initiates the highest energy cosmic ray showers.
We investigate characteristics of neutrino-induced showers compared to
proton-induced showers. The comparison includes study of starting depth,
profile with depth, lateral particle distribution at ground and muon lateral
distribution at ground level. We find that for cross sections above 20 mb there
are regions of parameter space where the two types of showers are essentially
indistinguishable. We conclude that the neutrino candidate hypothesis cannot be
ruled out on the basis of shower characteristics.


title: A Constrained Standard Model from a Compact Extra Dimension

abstract:
  A SU(3) \times SU(2) \times U(1) supersymmetric theory is constructed with a
TeV sized extra dimension compactified on the orbifold S^1/(Z_2 \times Z_2').
The compactification breaks supersymmetry leaving a set of zero modes which
correspond precisely to the states of the 1 Higgs doublet standard model.
Supersymmetric Yukawa interactions are localized at orbifold fixed points. The
top quark hypermultiplet radiatively triggers electroweak symmetry breaking,
yielding a Higgs potential which is finite and exponentially insensitive to
physics above the compactification scale. This potential depends on only a
single free parameter, the compactification scale, yielding a Higgs mass
prediction of 127 \pm 8 GeV. The masses of the all superpartners, and the
Kaluza-Klein excitations are also predicted. The lightest supersymmetric
particle is a top squark of mass 197 \pm 20 GeV. The top Kaluza-Klein tower
leads to the \rho parameter having quadratic sensitivity to unknown physics in
the ultraviolet.


title:
Hyperon semileptonic decay constants and quark-spin content of the octet
  baryons

abstract:
  We present the recent investigation on the effect of the SU(3) symmetry
breaking in the spin structure of the octet baryons.


title: Recent Developments in Supersymmetric Dark Matter

abstract:
  A brief review is given of some of the recent developments in the theoretical
analyses of supersymmetric dark matter. These include the effects of
uncertainties in the wimp velocity and wimp density and of the effects of
uncertainties in the quark densities of the proton. Also analyzed are the
effects of non-universalities in the gaugino sector and their effects on
determining the nature of cold dark matter, i.e., if the neutralino is bino
like, higgsino like, or wino like. The maximum and the minimum elastic
neutralino proton cross sections are discussed and a comparison of the direct
and the indirect detection arising from the capture and annihilation of
neutralinos in the core of the earth and the sun is given. Some of the other
recent developments are summarized.


title: Twist-three analysis of photon electroproduction with pion

abstract:
  We study twist-three effects in spin, charge, and azimuthal asymmetries in
deeply virtual Compton scattering on a spin-zero target. Contributions which
are power suppressed in 1/Q generate a new azimuthal angle dependence of the
cross section which is not present in the leading twist results. On the other
hand the leading twist terms are not modified by the twist three contributions.
They may get corrected at twist four level. In the Wandzura-Wilczek
approximation these new terms in the Fourier expansion with respect to the
azimuthal angle are entirely determined by the twist-two skewed parton
distributions. We also discuss more general issues like the general form of the
angular dependence of the differential cross section, validity of factorization
at twist-three level, and a relation of skewed parton distributions to spectral
functions.


title:
On the reactions p + p -> p + Lambda + K^+ and p + p -> p + Sigma^0 +
  K^+ near thresholds

abstract:
  The cross sections for the reactions of the strange production p + p -> p +
Lambda + K^+ and p + p -> p + Sigma^0 + K^+ near thresholds of the final states
p Lambda K^+ and p Sigma^0 K^+ are calculated in the effective Lagrangian
approach. Our approach is based on the dominant contribution of the one-pion
exchange and strong interaction of the colliding protons in the initial state.
The theoretical values of the cross sections agree reasonably well with the
experimental data. The polarization properties of the Lambda and Sigma^0
hyperons are discussed.


title:
The differential equation method: evaluation of complicated Feynman
  integrals

abstract:
  We discuss a progress in calculation of Feynman integrals which has been done
with help of the differential equation method and demonstrate the results for a
class of two-point two-loop diagrams.


title: Semi-Inclusive B\to K(K^*) X Decays with Initial Bound State Effects

abstract:
  The effects of initial $b$ quark bound state for the semi-inclusive decays
$B\to K(K^*) X$ are studied using light cone expansion and heavy quark
effective theory methods. We find that the initial bound state effects on the
branching ratios and CP asymmetries are small. In the light cone expansion
approach, the CP-averaged branching ratios are increased by about 2% with
respect to the free $b$-quark decay. For $\bar B^0 \to K^- (K^{*-}) X$, the
CP-averaged branching ratios are sensitive to the phase $\gamma$ and the CP
asymmetry can be as large as 7% (14%), whereas for $B^-\to \bar K^0 (\bar
K^{*0})X$ the CP-averaged branching ratios are not sensitive to $\gamma$ and
the CP asymmetries are small ($< 1%$). The CP-averaged branching ratios are
predicted to be in the ranges $(0.53 \sim 1.5)\times 10^{-4}$ [$(0.25 \sim
2.0)\times 10^{-4}$] for $\bar B^0 \to K^- (K^{*-})X$ and $(0.77 \sim
0.84)\times 10^{-4}$ [$(0.67 \sim 0.74)\times 10^{-4}$] for $B^-\to \bar K^0
(\bar K^{*0}) X$, depending on the value of the CP violating phase $\gamma$. In
the heavy quark effective theory approach, we find that the branching ratios
are decreased by about 10% and the CP asymmetries are not affected. These
predictions can be tested in the near future.


title:
Recent results from the canfranc dark matter search with germanium
  detectors

abstract:
  Two germanium detectors are currently operating in the Canfranc Underground
Laboratory at 2450 m.w.e looking for WIMP dark matter. One is a 2 kg 76Ge IGEX
detector (RG-2) which has an energy threshold of 4 keV and a low-energy
background rate of about 0.3 c/keV/kg/day. The other is a small (234 g) natural
abundance Ge detector (COSME), of low energy threshold (2.5 keV) and an energy
resolution of 0.4 keV at 10 keV which is looking for WIMPs and for solar
axions. The analysis of 73 kg-days of data taken by COSME in a search for solar
axions via their photon Primakoff conversion and Bragg scattering in the Ge
crystal yields a 95% C.L. limit for the axion-photon coupling g < 2.8 10^-9
GeV^-1. These data, analyzed for WIMP searches provide an exclusion plot for
WIMP-nucleon spin-independent interaction which improves previous plots in the
low mass region. On the other hand, the exclusion plot derived from the 60
kg-days of data from the RG-2 IGEX detector improves the exclusion limits
derived from other ionization (non thermal) germanium detector experiments in
the region of WIMP masses from 30 to 100 GeV recently singled out by the
reported DAMA annual modulation effect.


title: Soft diffraction at the LHC and properties of the Pomeron

abstract:
  We briefly describe a model for soft diffraction. The model description of
ISR, SppbarS and Tevatron data, and the predictions of the total, elastic,
single and double diffractive cross sections at the LHC can be found in the
original paper. Here we address issues raised at Diffraction 2000, in
particular concerning the nature of the resulting Pomeron trajectory.


title:
Particle interferometry, binary sources and oscillations in two-particle
  correlations

abstract:
  The basics and the formalism of Bose-Einstein correlations is briefly
reviewed. The invariant Buda-Lund form is summarized. Tools are presented that
can be utilized in a model-independent search for non-Gaussian structuctures in
the two-particle Bose-Einstein correlation functions. The binary source
formalism of particle interferometry is presented and related to oscillations
in the two-particle Bose-Einstein and Fermi-Dirac correlation functions. The
frequency of the observed oscillations in the NA49 two-proton correlation
function in Pb+Pb collisions at CERN SPS energies is explained with the help of
the reconstructed space-time picture of particle production and the binary
nature of the proton source in this reaction.


title:
Decay-lepton angular distributions in e+e- -> t tbar to O(alpha_s) in
  the soft-gluon approximation

abstract:
  Order-alpha_s QCD corrections in the soft-gluon approximation to angular
distributions of decay charged leptons in the process e+e- -> t tbar, followed
by semileptonic decay of t or tbar, are obtained in the e+e- centre-of-mass
frame. As compared to distributions in the top rest frame, these have the
advantage that they would allow direct comparison with experiment without the
need to reconstruct the top rest frame or a spin quantization axis. Analytic
expressions for the distribution in the charged-lepton polar angle and triple
distribution in the polar angle of t and polar and azimuthal angles of the
lepton are obtained. Numerical values are discussed for total c.m. energies of
400 GeV and 800 GeV.


title: Common Features of Particle Multiplicities in Heavy Ion Collisions

abstract:
  Results of a systematic study of fully integrated particle multiplicities in
central Au-Au and Pb-Pb collisions at beam momenta 1.7 A GeV, 11.6 A GeV
(Au-Au) and 158 A GeV (Pb-Pb) using a statistical-thermal model are presented.
The close similarity of the colliding systems makes it possible to study heavy
ion collisions under definite initial conditions over a range of centre-of-mass
energies covering more than one order of magnitude. We conclude that a thermal
model description of particle multiplicities, with additional strangeness
suppression, is possible for each energy. The degree of chemical equilibrium of
strange particles and the relative production of strange quarks with respect to
u and d quarks are higher than in e+e-, pp and pp(bar) collisions at comparable
and even at lower energies. The average energy per hadron in the comoving frame
is always close to 1 GeV per hadron despite the fact that the energy varies
more than 10-fold.


title: B Physics and CP Violation

abstract:
  After an introduction to the Standard-Model description of CP violation and a
brief look at the present status of this phenomenon in the kaon system, a
classification of non-leptonic B-decays is given and the formalism of
$B^0_{d,s}$--$\bar{B^0_{d,s}}$ mixing is discussed. We then turn to the
$B$-factory benchmark modes, CP violation in charged B decays, and the
$B_s$-meson system. Finally, we focus both on $B\to\pi K$ decays, which play an
important role to probe the CKM angle $\gamma$, and on the $B_d\to\pi^+\pi^-$,
$B_s\to K^+K^-$ system, which allows an interesting determination of $\beta$
and $\gamma$.


title: Electroweak Corrections to the Top Quark Decay

abstract:
  We have calculated the one-loop electroweak corrections to the decay t-> bW+,
including the counterterm for the CKM matrix elements V(tb). Previous
calculations used an incorrect delta V(tb) that led to a gauge dependent
amplitude. However, since the contribution stemming from delta V(tb) is small,
those calculations only underestimate the width by roughly one part in 10^5.


title: Density perturbations arising from multiple field slow-roll inflation

abstract:
  In this paper we analyze scalar gravitational perturbations on a
Robertson-Walker background in the presence of multiple scalar fields that take
values on a (geometrically non-trivial) field manifold during slow-roll
inflation. For this purpose modified and generalized slow-roll functions are
introduced and their properties examined. These functions make it possible to
estimate to what extent the gravitational potential decouples from the scalar
field perturbations. The correlation function of the gravitational potential is
calculated in an arbitrary state. We argue that using the vacuum state seems a
reasonable assumption for those perturbations that can be observed in the CMBR.
Various aspects are illustrated by examples with multiple scalar fields that
take values on flat and curved manifolds.


title: Strong Decays of Scalar Glueball in a Scale-Invariant Chiral Quark Model

abstract:
  An effective meson Lagrangian including a scalar glueball is constructed on
the base of $U(3)\times U(3)$ chiral symmetry. The glueball is introduced into
the meson Lagrangian by using the principle of scale invariance of an effective
Lagrangian and the dilaton model. The singlet-octet mixing of scalar meson
states is described by means of 't Hooft interaction. The contribution of the
scalar and pseudoscalar anomalies into the breaking of scale invariance is
taken into account. The mixing of quarkonia with the glueball is described. The
mass spectrum of scalar mesons together with the glueball and also their strong
decay widths are calculated. From comparing the obtained results with
experimental data, it follows that $f_0(1500)$ is rather a glueball, whereas
$f_0(1710)$ is a quarkonium. This accords with the results obtained in our
previous works where radially-excited scalar meson states were described. It is
shown that $\rho$-mesons play an important role in the description of glueball
decays.


title: Extracting energies from the vacuum

abstract:
  We present and study a possible mechanism of extracting energies from the
vacuum by external classical fields. Taking a constant magnetic field as an
example, we discuss why and how the vacuum energy can be released in the
context of quantum field theories. In addition, we give a theoretical
computation showing how much vacuum energies can be released. The possibilities
of experimentally detecting such a vacuum-energy releasing are discussed.


title: Hyperon Nonleptonic Weak Decays Revisited

abstract:
  We first review the current algebra - PCAC approach to nonleptonic octet
baryon 14 weak decay B (\to) (B^{\prime})(\pi) amplitudes. The needed four
parameters are independently determined by (\Omega \to \Xi \pi),(\Lambda K) and
(\Xi ^{-}\to \Sigma ^{-}\gamma) weak decays in dispersion theory tree order. We
also summarize the recent chiral perturbation theory (ChPT) version of the
eight independent B (\to) (B^{\prime}\pi) weak (\Delta I) = 1/2 amplitudes
containing considerably more than eight low-energy weak constants in one-loop
order.


title: Supersymmetry predictions for epsilon'/epsilon

abstract:
  We study the predictions for the direct CP violation parameter
epsilon'/epsilon in a class of string-inspired model with non-universal soft
A-terms. We show that the non-universality of the A-terms plays an important
rule in enhancing the supersymmetric contributions to the CP violation
epsilon'/epsilon. In particular, the supersymmetric contribution to
epsilon'/epsilon can be of order the KTeV result, epsilon'/epsilon ~ 10^(-3).


title: FCNC in SUSY models with non-universal A-terms

abstract:
  We study the inclusive branching ratio for B-> X_s gamma in a class of
string-inspired SUSY models with non-universal soft-breaking A-terms. We show
that b->s gamma do not severely constrain the non-universality of these models
and the parameter regions which are important for generating sizeable
contribution to epsilon'/epsilon, of order 2 x10^(-3), are not excluded. We
also show that the CP asymmetry of this decay is predicted to be much larger
than the standard model prediction in a wide region of the parameter space. In
particular, it can be of order 10-15% which can be accessible at B factories.


title: QED in the Worldline Formalism

abstract:
  A survey is given of applications of the ``string-inspired'' worldline
formalism to the computation of amplitudes and effective actions in QED.


title: Compton scattering in Noncommutative Space-Time at the NLC

abstract:
  We study the Compton scattering in the noncommutative counter part of QED (NC
QED). Interactions in NC QED have momentum dependent phase factors and the
gauge fields have Yang Mills type couplings, this modifies the cross sections
and are different from the commuting Standard Model. Collider signals of
noncommutative space-time are studied at the Next Linear Collider (NLC)
operating in the $e \gamma$ mode. Results for different polarised cases are
presented and it is shown that the Compton process can probe the noncommutative
scale in the range of 1 - 2.5 TeV for typical proposed NLC energies.


title: The Condensed Matter Physics of QCD

abstract:
  Important progress in understanding the behavior of hadronic matter at high
density has been achieved recently, by adapting the techniques of condensed
matter theory. At asymptotic densities, the combination of asymptotic freedom
and BCS theory make a rigorous analysis possible. New phases of matter with
remarkable properties are predicted. They provide a theoretical laboratory
within which chiral symmetry breaking and confinement can be studied at weak
coupling. They may also play a role in the description of neutron star
interiors. We discuss the phase diagram of QCD as a function of temperature and
density, and close with a look at possible astrophysical signatures.


title: Connection between Distribution and Fragmentation Functions

abstract:
  We show that the quark fragmentation function $D(z)$ and the quark
distribution function $q(x)$ are connected in the $z \to 1$ limit by the
approximate relation $D(z)/z \simeq q(2-1/z)$, where both quantities are in
their physical regions. Predictions for proton production in inelastic $e^+
e^-$ annihilation, based on the new relation and standard parametrizations of
quark distribution functions, are found to be compatible with the data.


title: The Minimal Model of Nonbaryonic Dark Matter: A Singlet Scalar

abstract:
  We propose the simplest possible renormalizable extension of the Standard
Model - the addition of just one singlet scalar field - as a minimalist model
for non-baryonic dark matter. Such a model is characterized by only three
parameters in addition to those already appearing within the Standard Model: a
dimensionless self-coupling and a mass for the new scalar, and a dimensionless
coupling, \lambda, to the Higgs field. If the singlet is the dark matter, these
parameters are related to one another by the cosmological abundance constraint,
implying that the coupling of the singlet to the Higgs field is large, \lambda
\sim O(0.1 - 1). Since this parameter also controls couplings to ordinary
matter, we obtain predictions for the elastic cross section of the singlet with
nuclei. The resulting scattering rates are close to current limits from both
direct and indirect searches. The existence of the singlet also has
implications for current Higgs searches, as it gives a large contribution to
the invisible Higgs width for much of parameter space. These scalars can be
strongly self-coupled in the cosmologically interesting sense recently proposed
by Spergel and Steinhardt, but only for very low masses (< 1 GeV), which is
possible only at the expense of some fine-tuning of parameters.


title:
An effective field theory for collinear and soft gluons: heavy to light
  decays

abstract:
  We construct the Lagrangian for an effective theory of highly energetic
quarks with energy Q, interacting with collinear and soft gluons. This theory
has two low energy scales, the transverse momentum of the collinear particles,
p_perp, and the scale p_perp^2/Q. The heavy to light currents are matched onto
operators in the effective theory at one-loop and the renormalization group
equations for the corresponding Wilson coefficients are solved. This running is
used to sum Sudakov logarithms in inclusive B -> X_s gamma and B -> X_u \ell nu
decays. We also show that the interactions with collinear gluons preserve the
relations for the soft part of the form factor for heavy to light decays found
by Charles et al., establishing these relations in the large energy limit of
QCD.


title:
The CP violating phase $\gamma$ from global fit of rare charmless
  hadronic B decays

abstract:
  We study constraints on the CP violating phase $\gamma$ in the
Kobayashi-Maskawa model using available experimental data. We first follow the
conventional method to up date the constraint on $\gamma$ by performing a
$\chi^2$ analysis using data from $|\epsilon_K|$, $\Delta m_{B_{d,s}}$ and
$|V_{ub}/V_{cb}|$. We also include the recent information on $\sin2\beta$ in
the analysis. We obtain the best fit for $\gamma$ to be $66^\circ$ and the 95%
C.L. allowed range to be $42^\circ \sim 87^\circ$. We then develop a method to
carry out a $\chi^2$ analysis based on SU(3) symmetry using data from $B\to \pi
\pi$ and $B\to K \pi$. We also discuss SU(3) breaking effects from model
estimate. We find that present data on $B\to \pi\pi, K \pi$ can also give some
constraint on $\gamma$ although weaker than the earlier method limited by the
present experimental errors. Future improved data will provide more stringent
constraint. Finally we perform a combined fit using data from $|\epsilon_K|$,
$\Delta m_{B_{d,s}}$, $|V_{ub}/V_{cb}|$, $\sin2\beta$ and rare charmless
hadronic B decays. The combined analysis gives $\gamma=67^\circ$ for the best
fit value and $43^\circ \sim 87^\circ$ as the 95% C.L. allowed range. Several
comments on other methods to determine $\gamma$ based on SU(3) symmetry are
also provided.


title: New meson mass relation and lowest pseudoscalar glueball mass

abstract:
  A new meson mass relation for meson nonet is given after considering mixing
with glueball. The mixing between pseudoscalar mesons and pseudoscalar glueball
will decrease the mass of glueball by about 500 Mev. So, according to the
predicted mass of the pure pseudoscalar glueball given by lattice calculation
and effective Hamiltonian, the expected mass of mixed pseudoscalar glueball is
about 1.7 Gev. This result is helpful for experimemtal search for the mixed
Isoscalar pseudoscalar glueball.


title: New form of matter at CERN SPS: Quark Matter but not Quark Gluon Plasma

abstract:
  I argue that a new form of matter is indeed seen in Pb+Pb collisions at CERN
SPS. However, this Quark Matter (QM) is different from the theoretically
predicted Quark Gluon Plasma (QGP) because its effective degrees of freedom
seem to be the massive (dressed) constituent quarks instead of almost massless
quarks and gluons. The equation of state of QM is hard,the time of its
rehadronization is short, while the equation of state of a QGP is soft and the
time of its rehadronization is long. Other similarities and differences are
also summarized.


title: Anomalous magnetic moment of the electron in a medium

abstract:
  Radiative effects are considered for an electron moving in a medium in the
presence of an external electromagnetic field. Anomalous magnetic moment (AMM)
of the electron in alpha-order is calculated under these conditions in the form
of two-dimensional integral. Behavior of AMM of high energy electron under
influence of multiple scattering in a medium is analyzed. Both mentioned
effects lead to reduction of AMM.


title: Spin effects in diffractive hadron photoproduction

abstract:
  We study spin asymmetries in diffractive $Q \bar Q$ and vector meson
production which are sensitive to the spin-dependent part of the
two-gluon-nucleon coupling. It is found that the $A_{ll}$ and $A_{lT}$
asymmetry in diffractive reactions can be used to study polarized gluon
distributions of the proton.


title:
NJL model in Four Dimension at Finite Temperature, Chemical Potentialand
  Curvature

abstract:
  Two flavor Nambu-Jona-Lasinio model with N components is studied in curved
space time at finite temperature and density in the leading 1/N expansion. In
four space time dimension the model exhibits first order phase transition for
positive curvature. Whereas in flat space an increase in temperature induces a
second order phase transition even at finite density, in curved space the
transition becomes first order. We obtain the phase boundary in
density-temperature plane and exhibit its behavior with changing curvature. A
three dimensional plot of the phase boundary in $\mu$-T-R space is drawn.


title:
On the polarization properties of the charmed baryon Lambda^+_c in the
  Lambda^+_c -> p + K^- + pi^+ + pi^0 decay

abstract:
  The polarization properties of the charmed Lambda^+_c baryon are investigated
in weak non-leptonic four-body Lambda^+_c -> p + K^- + pi^+ + pi^0 decay. The
probability of this decay and the angular distribution of the probability are
calculated in the effective quark model with chiral U(3)XU(3) symmetry
incorporating Heavy Quark Effective theory (HQET) and the extended
Nambu-Jona-Lasinio model with a linear realization of chiral U(3)XU(3)
symmetry. The theoretical value of the probability of the decay Lambda^+_c -> p
+ K^- + pi^+ + pi^0 relative to the probability of the decay Lambda^+_c -> p +
K^- + pi^+ does not contain free parameters and fits well experimental data.
The application of the obtained results to the analysis of the polarization of
the Lambda^+_c produced in the processes of photo and hadroproduction is
discussed.


title:
Magnetic moment of the two-particle bound state in quantum
  electrodynamics

abstract:
  We have formulated the quasipotential method for the calculation of the
relativistic and radiative corrections to the magnetic moment of the
two-particle bound state in the case of particles with arbitrary spin. It is
shown that the g-factors of bound particles contain $O(\alpha^2)$ terms
depending on the particle spin. Numerical values for the g-factors of the
electron in the hydrogen atom and deuterium are obtained.


title: Studying the scale and q^2 dependence of K^+-->pi^+e^+e^- decay

abstract:
  We extract the K^+-->pi^+e^+e^- amplitude scale at q^2=0 from the recent
Brookhaven E865 high-statistics data. We find that the q^2=0 scale is fitted in
excellent agreement with the theoretical long-distance amplitude. Lastly, we
find that the observed q^2 shape is explained by the combined effect of the
pion and kaon form-factor vector-meson-dominance rho, omega and phi poles, and
a charged pion loop coupled to a virtual photon-->e^+e^- transition.


title: Production of Two Photons and a Jet Through Gluon Fusion

abstract:
  We have computed the cross-section and distributions for the production of
two photons and a jet via the process $g g \to \gamma\gamma g$. In the Standard
Model, this process occurs at the one-loop level through pentagon and box
diagrams. We show that at the LHC this is a significant mechanism for the
production of the two photons and a jet. This process is also an important
background to the Higgs boson production, when the Higgs boson decays into two
photons. We also explorethis process at the Tevatron.


title: Prospects of Discovering the Higgs Boson at the Tevatron

abstract:
  We carry out an event generator based study to evaluate the usefulness of the
the exclusive signature ``$e^\pm (\mu^\pm) + 2$ bottom jets'' in discovering
the Higgs boson at the Tevatron.
  Using an event generator, we show that with enough luminosity, one should be
able to detect the Higgs boson up to the mass of about 130 GeV. We consider a
slightly modified version of the above signature that includes one extra jet.
  This new signature is more useful because it increases the number of signal
events significantly.


title: Valence quark distributions in mesons in generalized QCD sum rules

abstract:
  The method for calculation of valence quark distributions at intermediate $x$
is presented. The imaginary part of the virtual photon forward scattering
amplitude on the quark current with meson quantum number is considered. Initial
and final virtualities $p^2_1$ and $p^2_2$ of the currents are assumed to be
large, negative and different, $p^2_1 \not= p^2_2$. The operator product
expansion (OPE) in $p^2_1, p^2_2$ up to dimension 6 operators is performed.
Double dispersion representations in $p^2_1, p^2_2$ of the amplitude in terms
of physical states contributions are used. Equalling them to those calculated
in QCD by OPE the desired sum rules for quark distributions in mesons are
found. The double Borel transformations are applied to the sum rules, killing
non-diagonal transition terms, which deteriorated the accuracy in the previous
calculations of quark distributions in nucleon. Leading order perturbative
corrections are accounted. Valence quark distributions in pion, longitudinally
and transversally polarized $\rho$-mesons are calculated at intermediate $x$,
$0.2 \la x \la 0.7$ and normalization points $Q^2 = 2-4 GeV^2$ with no fitting
parameters. The use of the Regge behaviour at small $x$ and quark counting
rules at large $x$ allows one to find the first and the second moments of
valence quark distributions. The obtained quark distributions may be used as an
input for evolution equations. In the case of pion the quark distribution is in
agreement with those found from the data on the Drell-Yan process.


title: Observing Spin Correlations in Single Top Production and Decay

abstract:
  The weak decay of a polarized top quark has a rich structure of angular
correlations among its decay products. We describe some of the noteworthy
features of such decays. We then examine the three modes of single top
production, with an emphasis on the status of calculations of the degree and
direction of polarization at Run II of the Tevatron. The associated production
of a top quark with a W boson will be very difficult to observe at the
Tevatron. Prospects for observing the other two production mechanisms are much
better. The spin state of the produced top quark is understood at leading order
in the W* production channel. For the Wg-fusion process, we present new results
including the resummed logarithmic corrections of the form ln(mt^2/mb^2). The
spin-dependence of the complete order alpha_s corrections to either of these
processes has not yet been determined. The fraction of spin up top quarks is
large (approx. 95%) for both modes provided that the appropriate spin
quantization axis is chosen.