title: Critical couplings in Crystalline Color superconductivity

abstract:
  Solving the Schwinger-Dyson equations, we analyze the pairing of quarks in
asymmetric quark matter where quarks have different chemical potentials. We
show that in the asymmetric quark matter a crystalline color-superconducting
gap opens when the quark coupling is stronger than a critical value. The
critical coupling is nonzero, since the infrared divergence is lessened when
the momenta of pairing quarks are not opposite. The superconducting gaps and
the critical couplings are calculated both at high and intermediate densities.


title: Theory of Neutrino Flavor Mixing

abstract:
  The depth of our theoretical understanding of neutrino flavor mixing should
match the importance of this phenomenon as a herald of long-awaited empirical
challenges to the standard model of particle physics. After reviewing the
familiar, simplified quantum mechanical model and its flaws, I sketch the
deeper understanding of both vacuum and matter-enhanced flavor mixing that is
found in the framework of scattering theory. While the simplified model gives
the ``correct answer'' for atmospheric, solar, and accelerator/reactor neutrino
phenomena, I argue that a key insight from the deeper picture will simplify the
treatment of neutrino transport in astrophysical environments---supernovae, for
example---in which neutrinos play a dynamically important role.


title:
Almost Maximal Lepton Mixing with Large T Violation in Neutrino
  Oscillations and Neutrinoless Double Beta Decay

abstract:
  We point out two simple but instructive possibilities to construct the
charged lepton and neutrino mass matrices, from which the nearly bi-maximal
neutrino mixing with large T violation can naturally emerge. The two lepton
mixing scenarios are compatible very well with current experimental data on
solar and atmospheric neutrino oscillations, and one of them may lead to an
observable T-violating asymmetry between \nu_\mu --> \nu_e and \nu_e -->
\nu_\mu transitions in the long-baseline neutrino oscillation experiments.
Their implications on the neutrinoless double beta decay are also discussed.


title:
Single gluino production in the R-parity lepton number violating MSSM at
  the LHC

abstract:
  We examine the $R_{p}$-violating signal of single gluino production
associated with a charged lepton or neutrino at the large hadron collider
(LHC), in the model of R-parity relaxed supersymmetric model. If the parameters
in the ${\rlap/R}_p$ supersymmetric interactions are not too small, and the
mass of gluino is considered in the range from several GeV (as the Lightest
Supersymmetric Particle) to 800 GeV, the cross section of the single gluino
production via Drell-Yan processes can be in the order of $10^2 \sim 10^3$
femto barn, and that via gluon fusion in the order of $10^{-1} \sim 10^3$ femto
barn. If the gluino decay can be well detected in the CERN LHC, this process
provides a prospective way to probe supersymmetry and $R_p$ violation.


title:
Search for T-violation in Neutrino Oscillation with the Use of Muon
  Polarization at a Neutrino Factory

abstract:
  A possibility to search for T-violation in neutrino oscillation with the use
of muon polarization is studied. The sensitivity to T-violation is examined
with different muon polarization as a function of muon energy and long-baseline
distances.


title: Towards the Equation of State of Classical SU(2) Lattice Gauge Theory

abstract:
  We determine numerically the full complex Lyapunov spectrum of SU(2)
Yang-Mills fields on a 3-dimensional lattice from the classical chaotic
dynamics. The equation of state, S(E), is determined from the Kolmogorov-Sinai
entropy extrapolated to the large size limit.


title: Diffusion corrections to the hard pomeron

abstract:
  The high-energy behaviour of two-scale hard processes is investigated in the
framework of small-x models with running coupling, having the Airy diffusion
model as prototype. We show that, in some intermediate high-energy regime, the
perturbative hard Pomeron exponent determines the energy dependence, and we
prove that diffusion corrections have the form hinted at before in particular
cases. We also discuss the breakdown of such regime at very large energies, and
the onset of the non-perturbative Pomeron behaviour.


title: Calculation of Reggeon Vertices in QCD

abstract:
  The method of calculation of effective vertices of interaction of the
Reggeized gluon and quark with particles in QCD in the next-to-leading order is
developed. The method is demonstrated in the case of already known vertices of
both gluon-gluon and quark-quark transitions in the scattering of gluons and
quarks on the Reggeized gluon. It is used for the calculation of the
gluon-quark transition in the scattering on the Reggeized quark.


title: The pion structure function and jet production in $\gamma p \to n X$

abstract:
  Despite its theoretical and practical importance, the pion structure is still
badly constrained, particularly at low $x_{\pi}$ and in the sea-quark and gluon
sectors. Recently ZEUS have presented data on dijet photoproduction with a
leading neutron, which is dominated by slightly off-shell pion exchange and can
be used to constrain the pion densities down to $x_{\pi}\simeq 0.01$. We
compare a recent NLO calculation to the ZEUS data and find that the lower gluon
densities of SMRS seem to be preferred by the data. Theoretical uncertainties,
in particular from the pion flux, are discussed in some detail.


title: Mesonic Tensor Form Factors with Light Front Quark Model

abstract:
  We study the tensor form factors for $P \to P$ and $P \to V$ transitions in
the light-front quark model with $P$ and $V$ being pseudoscalar and vector
mesons, respectively. We explore the behaviors of these form factors in the
entire physical range of $0\leq p^2\leq (M_i - M_f)^2$. At the maximum recoil
of $p^2=0$, we compare our results of the form factors in $B\to \pi,K,\rho,K^*$
with various other calculations in the literature.


title: An absolute polarimeter for high energy protons

abstract:
  A study of the spin asymmetries for polarized elastic proton proton
collisions in the electromagnetic hadronic interference (CNI) region of
momentum transfer provides a method of self calibration of proton polarization.
The method can be extended to non-identical spin half scattering so that, in
principle, the polarization of a proton may be obtained through an analysis of
its elastic collision with a different polarized particle, helium 3 for
instance. Sufficiently large CNI spin asymmetries provide enough information to
facilitate the evaluation of nearly all the helicity amplitudes at small t as
well as the polarization of both initial spin half fermions. Thus it can serve
equally well as a polarimeter for helium 3.


title: Leptogenesis with Single Right-Handed Neutrino Dominance

abstract:
  We make an analytic and numerical study of leptogenesis in the framework of
the (Supersymmetric) Standard Model plus the see-saw mechanism with a U(1)
family symmetry and single right-handed neutrino dominance. In presenting our
analytic and numerical results we make a clear distinction between the
theoretically clean asymmetry parameter $\epsilon_1$ and the baryon asymmetry
$Y_B$. In calculating $Y_B$ we propose and use a fit to the solutions to the
Boltzmann equations which gives substantially more reliable results than
parametrisations previously used in the literature. Our results show that there
is a decoupling between the low energy neutrino observables and the
leptogenesis predictions, but that nevertheless leptogenesis is capable of
resolving ambiguities within classes of models which would otherwise lead to
similar neutrino observables. For example we show that models where the
dominant right-handed neutrino is the heaviest are preferred to models where it
is the lightest and study an explicit example of a unified model of this type.


title: Ioffe Time in Double Logarithmic Approximation

abstract:
  We analyze the light cone (Ioffe) time structure of the gluon distribution
function in the double logarithmic approximation. We show that due to QCD
evolution Ioffe equation is modified. The characteristic light cone time of the
gluons does not increase as fast with increasing energy (decreasing Bjorken x)
as predicted by the parton distributions exhibiting Bjorken scaling due to the
increase of the transverse momenta of the gluons in the DGLAP ladder.


title: Multi-GeV Gluonic Mesons

abstract:
  Lattice QCD gives reliable predictions for hybrid charmonium and multi-GeV
glueball masses. Proton-antiproton annihilation may offer an excellent
opportunity for the first observation of these states. There are two distinct
possible programs: The search for J^PC-exotic and non-J^PC-exotic states. The
latter program represents substantially higher cross sections and does not
absolutely require partial wave analysis, two very attractive features. The
program can be performed with a varying pbar energy <10 GeV and a fixed target.


title: Supernovae, Hypernovae and Color Superconductivity

abstract:
  We argue that Color Superconductivity (CSC, Cooper pairing in quark matter
leading to the breaking of SU(3) color symmetry) may play a role in triggering
the explosive endpoint of stellar evolution in massive stars (M > 8 M_{\odot}).
We show that the binding energy release in the transition of a sub-core region
to the CSC phase can be of the same order of magnitude as the gravitational
binding energy release from core collapse. The core temperature during collapse
is likely below the critical temperature for CSC, and the transition is first
order, proceeding on Fermi timescales when the pressure reaches a critical
value of several times nuclear density. We also discuss the implications for
hypernova events with total ejecta energy of 10-100 times that of type II
supernova.


title: On the NLO Power Correction to Photon-Pion Transition Form Factor

abstract:
  We propose a perturbative evaluation for the next-to-leading-order (NLO)
$O(1/Q^4)$ power correction to the photon-pion transition form factor. The
effects of the NLO power correction are analyzed.


title: Multiplicity Ratios and the Confinement Mechanism

abstract:
  I review theoretical and experimental challenges in studies of the ratio of
multiplicities in quark and gluon jets, and its relevance for our understanding
of hadronization.


title:
Pion Generalized Dipole Polarizabilities by Virtual Compton Scattering
  $\pi e \to \pi e\gamma$

abstract:
  We present a calculation of the cross section and the event generator of the
reaction $\pi e\to \pi e \gamma$. This reaction is sensitive to the pion
generalized dipole polarizabilities, namely, the longitudinal electric
$\alpha_L(q^2)$, the transverse electric $\alpha_T(q^2)$, and the magnetic
$\beta(q^2)$ which, in the real-photon limit, reduce to the ordinary electric
and magnetic polarizabilities $\bar{\alpha}$ and $\bar{\beta}$, respectively.
The calculation of the cross section is done in the framework of chiral
perturbation theory at ${\cal O}(p^4)$. A pion VCS event generator has been
written which is ready for implementation in GEANT simulation codes or for
independent use.


title: The LEP Trail to Non-Perturbative QCD

abstract:
  This talk summarizes the presentations given in the Hadronic Physics session
at the LEPTRE meeting, emphasizing the importance of LEP data in our quest for
a successful approach to non-perturbative QCD.


title:
Violation of the Equivalence Principle in the light of the SNO and SK
  solar neutrino results

abstract:
  The SNO result on charged current deuteron disintegration, the
SuperKamiokande 1258-day data on electron scattering, and other solar neutrino
results are used to revisit the model of neutrino oscillations driven by a
violation of the equivalence principle. We use a chisq minimization technique
to examine oscillation between the nu(e) and another active neutrino, both
massless, and find that within the Standard Solar Model the fit to the SNO and
SuperKamiokande spectra are moderately good while a very good fit is obtained
when the absolute normalizations of the 8B and hep neutrino fluxes are allowed
to vary. The best fit prefers large, but not maximal, mixing, essentially no
hep neutrinos, and a 40% reduction in the 8B neutrino flux. The fit to the
total rates from the different experiments is not encouraging but when the
rates and spectra are considerd together the situation is much improved. We
remark on the expectations of the VEP model for the neutral current
measurements at SNO.


title: In-medium \Sigma^0-\Lambda Mixing in QCD Sum Rules

abstract:
  The \Sigma^0-\Lambda mixing angle in isospin-asymmetric nuclear medium is
investigated by using QCD sum rules. From the general consideration of the
in-medium baryonic correlations, in-medium baryon mixings are shown to have
several Lorentz structures such as the scalar mixing angle \theta^S and the
vector mixing angle \theta^V. This causes a difference between the particle
mixing \theta (= \theta^S + \theta^V) and the anti-particle mixing \bar{\theta}
(= \theta^S - \theta^V). From the finite energy sum rules for the
\Sigma^0-\Lambda mixing, we find that the in-medium part of the mixing angle
has a relation \theta^S_{Med} \simeq - \theta^V_{Med} in the isospin-asymmetric
medium. This implies that the medium affects mainly the anti-particle mixing.
  From the Borel sum rules, we obtain |\bar{\theta} - \theta_0| \simeq 0.39
|(\rho_n - \rho_p)| / \rho_0 with \theta_0, \rho_n, \rho_p and \rho_0 being the
vacuum mixing angle, the neutron density, the proton density and the normal
nuclear matter density respectively.


title:
Effective gluon interactions in the Colour Superconductive Phase of two
  flavor QCD

abstract:
  The gluon self-energies and dispersion laws in the color superconducting
phase of QCD with two massless flavors are calculated using the effective
theory near the Fermi surface. These quantities are calculated at zero
temperature for all the eight gluons, those of the remaining SU(2) color group
and those corresponding to the broken generators. The construction of the
effective interaction is completed with the one loop calculation of the three-
and four-point gluon interactions.


title: A new mass relation among the hadron vector resonances

abstract:
  We show that the hadron vector resonances are described by fields
transforming according to different inequivalent representations of the Lorentz
group: (1/2,1/2) and (1,0)+(0,1). The vector representation (1/2,1/2) is well
studied and corresponds to the gauge fields. On the other hand, the chiral
representations (1,0) and (0,1) are described by the second rank antisymmetric
tensor fields, for which interaction theory has not yet been constructed. In
the framework of the phenomenological Nambu - Jona-Lasinio approach we have
introduced and used all these fields for a description of the vector
resonances. A new mass relation between low-lying hadron vector and
axial-vector resonances is obtained. This relation is in agreement with the
present experimental data.


title: Soft Color Enhancement of the Production of J/psi's by Neutrinos

abstract:
  We calculate the production of J/psi mesons by neutrino-nucleon collisions in
fixed target experiments. Soft color, often referred to as color evaporation
effects, enhance production cross sections due to the contribution of color
octet states. Though still small, J/\psi production may be observable in
present and future experiments like NuTeV and muon colliders.


title: Expected Signals in Relic Neutrino Detectors

abstract:
  Here we estimate the magnitude of the signals expected for realistic cosmic
neutrino backgrounds in detectors attempting to measure the mechanical forces
exerted on macroscopic targets by the elastic scattering of relic neutrinos. We
study effects proportional to the weak coupling constant $G_F$ and to $G_F^2$
for Dirac and Majorana neutrinos, either relativistic or non-relativistic, both
gravitationally bound or not.


title: The High Density Effects in Heavy Quark Production at pA Colliders

abstract:
  In this paper we investigate the role of the high density effects in the
heavy quark production cross section in $pA$ processes at RHIC and LHC. We use,
as initial condition, a gluon distribution consistent with fixed target nuclear
data and the Glauber-Mueller approach to describe the high density effects. We
show that this process can be used as a probe of the presence of the high
density effects. Moreover, we include these effects in the calculation of the
heavy quark production in $AA$ collisions, verifying that they cannot be
disregarded both in the estimates of quarkonium suppression and in the initial
conditions of the quark-gluon plasma.


title:
Gluons, quarks, and the transition from nonperturbative to perturbative
  QCD

abstract:
  Lattice-based investigations of two fundamental QCD quantities are described,
namely the gluon and quark propagators in Landau gauge. We have studied the
Landau gauge gluon propagator using a variety of lattices with spacings from a
= 0.17 to 0.41 fm. We demonstrate that it is possible to obtain scaling
behavior over a very wide range of momenta and lattice spacings and to explore
the infinite volume and continuum limits. These results confirm that the Landau
gauge gluon propagator is infrared finite. We study the Landau gauge quark
propagator in quenched QCD using two forms of the O(a)-improved propagator and
we find good agreement between these. The extracted value of the infrared quark
mass in the chiral limit is found to be 300 +/- 30 MeV. We conclude that the
momentum regime where the transition from nonperturbative to perturbative QCD
occurs is Q^2 approx 4GeV^2.


title:
Yukawa Hierarchy Transfer from Superconformal Sector and Degenerate
  Sfermion Masses

abstract:
  We propose a new type of supersymmetric models coupled to superconformal
field theories (SCFT's), leading simultaneously to hierarchical Yukawa
couplings and completely degenerate sfermion masses. We consider models with an
extra Abelian gauge symmetry to generate hierarchical structure for couplings
between the SM sector and the SC sector. Interestingly, this hierarchy is
inversely transferred to the Yukawa couplings in the SM sector. In this type of
models, flavor-independent structure of the superconformal fixed point
guarantees that the sfermion masses of the first and the second generations are
completely degenerate at low energy.


title:
New Theoretical and Experimental Correlation Aspects of QCD-Instantons
  in High Energy Collisions

abstract:
  Possibility of experimental identification of QCD-instantons in high energy
collisions is studied by means of correlations analysis in final states.
Instanton-induced processes amplitudes are performed in the framework of QCD in
Gauss approximation. Hadronization is taken into account by Monte-Carlo method.
Obtained results can be used as additional criterions of QCD-instanton
identification at HERA (DESY). Unlike previous results in this report we
consider also nonzero quarks modes contribution into parton distributions of
instanton processes.


title:
Resummation of Double Logarithmic Terms LN^2(1/x) in the Polarized
  Nonsinglet Structure Function g_1 at Small x via GLAP-Like Approach

abstract:
  An alternative equation, resumming of the $\ln^2 1/x$ terms for the polarized
nonsinglet structure function $g_1^{NS}$ at small $x$ is presented.
Construction of the GLAP-like formula for the auxiliary function, corresponding
to the $g_1^{NS}$ at rescaled $Q^2$ variable is shown. Predictions of this
approach for the $g_1^{NS}$ function at small $x$ in a case of a flat as well
as a dynamical input are given. The role of the fixed coupling constant and the
running one is also discussed.


title:
Theoretical status of the lifetime predictions: $(\Delta \Gamma/
  \Gamma)_{B_s}, \tau_{B^+}/\tau_{B_d}$ and $\tau_{\Lambda_b}/\tau_{B_d}$

abstract:
  We give a review of the theoretical status of the lifetime predictions in the
standard model. In case of $(\Delta \Gamma/ \Gamma)_{B_s}$ we are already in a
rather advanced stage. We obtain
$(\Delta\Gamma/\Gamma)_{B_s}=(9.3^{+3.4}_{-4.6})%$. It seems to be difficult to
improve these errors substantially. In addition now some experimental results
are available. For $\tau_{B^+}/\tau_{B_d}$ and $\tau_{\Lambda_b} / \tau_{B_d}$
the theoretical status is much less advanced and the discrepancy between
experiment and theory still remains. We conclude with a what-to-do-list for
theorists.


title: DCC Dynamics in (2+1)D-O(3) model

abstract:
  The dynamics of symmetry-breaking after a quench is numerically simulated on
a lattice for the (2+1)-dimensional O(3) model. In addition to the standard
sigma-model with temperature-dependent Phi^4-potential the energy functional
includes a four-derivative current-current coupling to stabilize the size of
the emerging extended topological textures. The total winding number can be
conserved by constraint. As a model for the chiral phase transition during the
cooling phase after a hadronic collision this allows to investigate the
interference of 'baryon-antibaryon' production with the developing disoriented
aligned domains. The growth of angular correlations, condensate, average
orientation is studied in dependence of texture size, quench rate, symmetry
breaking. The classical dissipative dynamics determines the rate of energy
emitted from the relaxing source for each component of the 3-vector field which
provides a possible signature for domains of Disoriented Chiral Condensate. We
find that the 'pions' are emitted in two distinct pulses; for sufficiently
small lattice size the second one carries the DCC signal, but it is strongly
suppressed as compared to simultaneous 'sigma'-meson emission. We compare the
resulting anomalies in the distributions of DCC pions with probabilities
derived within the commonly used coherent state formalism.


title:
Leading and higher twists in the proton polarized structure function at
  large Bjorken x

abstract:
  A phenomenological parameterization of the proton polarized structure
function has been developed for x > 0.02 using deep inelastic data up to ~ 50
(GeV/c)**2 as well as available experimental results on both photo- and
electro-production of proton resonances. According to the new parameterization
the generalized Drell-Hearn-Gerasimov sum rule is predicted to have a
zero-crossing point at Q**2 = 0.16 +/- 0.04 (GeV/c)**2. Then, low-order
polarized Nachtmann moments have been estimated and their Q**2-behavior has
been investigated in terms of leading and higher twists for Q**2 > 1
(GeV/c)**2. The leading twist has been treated at NLO in the strong coupling
constant and the effects of higher orders of the perturbative series have been
estimated using soft-gluon resummation techniques. In case of the first moment
higher-twist effects are found to be quite small for Q**2 > 1 (GeV/c)**2, and
the singlet axial charge has been determined to be a0[10 (GeV/c)**2] = 0.16 +/-
0.09. In case of higher order moments, which are sensitive to the large-x
region, higher-twist effects are significantly reduced by the introduction of
soft gluon contributions, but they are still relevant at Q**2 ~ few (GeV/c)**2
at variance with the case of the unpolarized transverse structure function of
the proton. Our finding suggests that spin-dependent correlations among partons
may have more impact than spin-independent ones. As a byproduct, it is also
shown that the Bloom-Gilman local duality is strongly violated in the region of
polarized electroproduction of the Delta(1232) resonance.


title: Charmed baryons in lattice QCD

abstract:
  Masses of singly and doubly charmed baryons are calculated in quenched
lattice QCD using an improved action of the D234 type on an anisotropic
lattice. The mass differences between spin 3/2 and spin 1/2 baryon states are
calculated and compared to mass differences between vector and pseudoscalar
mesons. The suppression of spin splittings in mesons containing heavy quarks,
characteristic of quenched QCD simulations, is not observed in the baryon
sector. The mass dependence of color hyperfine effects is discussed within the
context of the quark model and heavy quark effective theory.


title:
Application of Pauli-Villars regularization and discretized light-cone
  quantization to a single-fermion truncation of Yukawa theory

abstract:
  We apply Pauli-Villars regularization and discretized light-cone quantization
to the nonperturbative solution of (3+1)-dimensional Yukawa theory in a
single-fermion truncation. Three heavy scalars, including two with negative
norm, are used to regulate the theory. The matrix eigenvalue problem is solved
for the lowest-mass state with use of a new, indefinite-metric Lanczos
algorithm. Various observables are extracted from the wave functions, including
average multiplicities and average momenta of constituents, structure
functions, and a form factor slope.


title: The Structure of GUT Breaking by Orbifolding

abstract:
  Recently, an attractive model of GUT breaking has been proposed in which a 5
dimensional supersymmetric SU(5) gauge theory on an S^1/(Z_2\times Z_2')
orbifold is broken down to the 4d MSSM by SU(5)-violating boundary conditions.
Motivated by this construction and several related realistic models, we
investigate the general structure of orbifolds in the effective field theory
context, and of this orbifold symmetry breaking mechanism in particular. An
analysis of the group theoretic structure of orbifold breaking is performed.
This depends upon the existence of appropriate inner and outer automorphisms of
the Lie algebra, and we show that a reduction of the rank of the GUT group is
possible. Some aspects of larger GUT theories based on SO(10) and E_6 are
discussed. We explore the possibilities of defining the theory directly on a
space with boundaries and breaking the gauge symmetry by more general
consistently chosen boundary conditions for the fields. Furthermore, we derive
the relation of orbifold breaking with the familiar mechanism of Wilson line
breaking, finding a one-to-one correspondence, both conceptually and
technically. Finally, we analyse the consistency of orbifold models in the
effective field theory context, emphasizing the necessity for self-adjoint
extensions of the Hamiltonian and other conserved operators, and especially the
highly restrictive anomaly cancellation conditions that apply if the bulk
theory lives in more than 5 dimensions.


title:
Probing scalar-pseudoscalar mixing in the CP violating MSSM at
  high-energy $e^+e^-$ colliders

abstract:
  We study the production processes $e^+e^-\to H^0_iZ$, $H^0_iH^0_j$ and
$H^0_i\nu_e\overline \nu_e$ in the context of the CP violating MSSM. In a given
channel we show that the cross-section for all i (=1,2,3) can be above 0.1 fb
provided $M_{H_{2,3}}\la 300$ GeV. This should be detectable at a Next Linear
Collider and would provide evidence for scalar-pseudoscalar mixing.


title:
Coupling constants g$_{a_0\omega\gamma}$ and g$_{a_0\rho\gamma}$ as
  derived from QCD sum rules

abstract:
  We consider the two point correlation function of scalar current in QCD sum
rules approach to estimate the overlap amplitude of $a_0$ meson. We then employ
QCD sum rules to calculate the coupling constants g$_{\omega a_0\gamma}$ and
g$_{\rho a_0\gamma}$ by studying the three point ${a_0\omega\gamma}$- and
${a_0\rho\gamma}$-correlation functions.


title:
Distortions in the negative energy Dirac sea: violation of the Gottfried
  sum rule and $\Delta\bar{u}$ in proton

abstract:
  We report on recent work concerning the effect which the change in vacuum
structure (negative energy Dirac sea), in the presence of a confining scalar
field, has on the nucleon structure functions and parton distributions. Using
the Dirac equation in 1+1 dimensions, we show that distortions in the Dirac sea
are responsible for part of the violation of the Gottfried sum rule -- i.e.,
part of the flavor asymmetry in the proton sea. Our basic argument is that,
even if isospin is an exact symmetry, the presence of a confining potential
changes the vacuum structure, and inevitably leads to a violation of SU(2)
flavour symmetry in a hadron with a different number of valence $u$ and $d$
quarks. The same mechanism also leads to a prediction for $\Delta\bar{u}$ and
$\Delta\bar{d}$.


title: Study of B0-->J/Psi D(*) and etac D(*) in Perturbative QCD

abstract:
  Motivated by recent interest in soft $J/\Psi$ production in B decays, we
investigate ${B}^0 \to J/\Psi D^{(\star)}$ and $\eta_c D^{(\star)}$ decays in
perturbative QCD. We find that, within that framework, these decays are
calculable since the heavy $c\bar{c}$ pair in the final states is created by a
hard gluon. The branching ratios are estimated to be around $10^{-7}\sim
10^{-8}$, too small to be consistent with the data, suggesting that other
mechanism(s) contribute to the observed excess of soft $J/\Psi$ in ${B}^0 \to
J/\Psi + X$ decays. The possibility of the production of a hybrid $s{\bar d}g$
meson with mass about 2 GeV is briefly entertained.


title:
Asymmetries Between Strange and Antistrange Particle Production in
  Pion-Proton Interactions

abstract:
  Recent measurements of the asymmetries between Feynman $x$ distributions of
strange and antistrange hadrons in $\pi^- A$ interactions show a strong effect
as a function of $x_F$. We calculate strange hadron production in the context
of the intrinsic model and make predictions for particle/antiparticle
asymmetries in these interactions.


title: Are the $J/\psi$ and $\chi_c A$ Dependencies the Same?

abstract:
  It has been empirically observed that the dependence of $J/\psi$ and $\psi'$
production on nuclear mass number $A$ is very similar. This has been postulated
to be due to the predominance of color octet pre-resonant states in charmonium
production and absorption. Two new experiments, NA60 at CERN and HERA-B at
DESY, will measure the $\chi_c$ $A$ dependence for the first time. These
measurements should shed new light on the charmonium production and absorption
mechanisms.


title: Kaon physics with a high-intensity proton driver

abstract:
  We study opportunities for future high-precision experiments in kaon physics
using a high-intensity proton driver, which could be part of the front-end of a
muon storage ring complex. We discuss in particular the rare decays
$K_L\to\pi^0\nu\bar\nu$, $K^+\to\pi^+\nu\bar\nu$, $K_L\to\pi^0e^+e^-$, and
lepton-flavour violating modes such as $K_L\to\mu e$ and $K\to\pi\mu e$. The
outstanding physics potential and long-term interest of these modes is
emphasized. We review status and prospects of current and planned experiments
for the processes under consideration, and indicate possible improvements and
strategies towards achieving the necessary higher sensitivity. Finally, we
outline the machine requirements needed to perform these high-precision kaon
experiments in the context of a muon storage ring facility.


title: On P-wave meson decay constants in the heavy quark limit of QCD

abstract:
  In previous work it has been shown that, either from a sum rule for the
subleading Isgur-Wise function $\xi_3(1)$ or from a combination of Uraltsev and
Bjorken SR, one infers for $P$-wave states $|\tau_{1/2}(1)| \ll
|\tau_{3/2}(1)|$. This implies, in the heavy quark limit of QCD, a hierarchy
for the {\it production} rates of $P$-states $\Gamma(\bar{B}_d \to D ({1 \over
2}) \ell \nu) \ll \Gamma(\bar{B}_d \to D ({3 \over 2}) \ell \nu)$ that seems at
present to be contradicted by experiment. It was also shown that the decay
constants of $j = {3 \over 2}$ $P$-states vanish in the heavy quark limit of
QCD, $f_{3/2}^{(n)} = 0$. Assuming the {\it model} of factorization in the
decays $\bar{B}_d \to \bar{D}_s^{**}D$, one expects the opposite hierarchy for
the {\it emission} rates $\Gamma(\bar{B}_d \to \bar{D}_s ({3 \over 2}) D) \ll
\Gamma(\bar{B}_d \to \bar{D}_s ({1 \over 2}) D)$, since $j = {1 \over 2}$
$P$-states are coupled to vacuum. Moreover, using Bjorken SR and previously
discovered SR involving heavy-light meson decay constants and IW functions, one
can prove that the sums $\sum\limits_n ({f^{(n)} \over f^{(0)}})^2$,
$\sum\limits_n ({f_{1/2}^{(n)} \over f^{(0)}})^2$ (where $f^{(n)}$ and
$f_{1/2}^{(n)}$ are the decay constants of $S$-states and $j = {1\over 2}$
$P$-states) are divergent. This situation seems to be realized in the
relativistic quark models \`a la Bakamjian and Thomas, that satisfy HQET and
predict decays constants $f^{(n)}$ and $f_{1/2}^{(n)}$ that do not decrease
with the radial quantum number $n$.


title:
$\Delta M_s/\Delta M_d$, $\sin 2\beta$ and the angle $\gamma$ in the
  Presence of New $\Delta F=2$ Operators

abstract:
  We present formulae for the mass differences $\Delta M_d$ and $\Delta M_s$ in
the \BBds systems and for the CP violation parameter $\epsilon$ which are valid
in minimal flavour violation models giving rise to new four-fermion $\Delta
F=2$ operators. Short distance contributions to $\Delta M_s$, $\Delta M_d$ and
$\epsilon$ are parameterized by three {\it real} functions $F^s_{tt}$,
$F^d_{tt}$ and $F^\epsilon_{tt}$, respectively ($F^s_{tt} = F^d_{tt} =
F^\epsilon_{tt}$ holds only if the Standard Model $(V-A) \otimes (V-A)$
operators dominate). We present simple strategies involving the ratio $\Delta
M_s/\Delta M_d$, $\sin2\beta$ and $\gamma$ that allow to search for the effects
of the new operators. We point out that their sizable contributions to the
ratio $\Delta M_s/\Delta M_d$ would in principle allow $\gamma$ to be larger
than $90^\circ$. Constraints on the functions $F^i_{tt}$ imposed by the present
(and future) experimental data are also discussed. As an example we show that
for large $\tan\bar\beta\equiv v_2/v_1$ and $H^+$ not too heavy, $F^s_{tt}$ in
the MSSM with heavy sparticles can be substantially smaller than in the SM due
the charged Higgs box contributions and in particular due to the growing like
$\tan^4\bar\beta$ contribution of the double penguin diagrams involving neutral
Higgs boson exchanges. As a result the bounds on the function $F^s_{tt}$ can be
violated which allows to exclude large mixing of stops. In this scenario the
range of $\sin2\beta$ following from $\epsilon$ and $\Delta M_d$ is identical
to the SM ones ($0.5<\sin 2\beta<0.8$). On the other hand $\gamma$ following
from $\Delta M_s/\Delta M_d$ is lower.


title:
Comment on "Chiral symmetry and the intrinsic structure of the nucleon"-
  by D.B.Leinweber,A.W.Thomas and R.D.Young

abstract:
  Some remarks are presented on a recent paper (Leinweber,Thomas and Young,
Phys.Rev.Lett. 86, 5011, 2001). In particular a statement of the above paper on
the fact that the ratio between the magnetic moments of proton and neutron
should remain constant at -3/2, independent of the change of the quark mass is
discussed on the basis of the general parameterization.


title: Generation Structure and Proton Decay Problem

abstract:
  Possible generation structure is investigated. We considere alternative
possibility of combination of leptons and quarks to compose each generation,
where the combination of $(\nu_{\tau},{\tau})$ and $(u,d)$ compose a
generation. Our model exhibits the hierarcy structure after sea-saw mechanism
provived that possible existence of realistic right-handed neutrinos are taken
into account. Then, in the GUTs model based on our scheme, possible
inter-generation properties are examined together with the classification of
gauge bosons. It is shown that if our scheme is realized, the proton decay
exhibits different mode from ordinary one.


title:
RG/Pade Estimate of the Three-Loop Contribution to the QCD Static
  Potential Function

abstract:
  The three renormalization-group-accessible three-loop coefficients of powers
of logarithms within the \bar{MS} series momentum-space for the QCD static
potential are calculated and compared to values obtained via asymptotic
Pad\'e-approximant methods. The leading and next-to-leading logarithmic
coefficients are both found to be in exact agreement with their asymptotic
Pad\'e-predictions. The predicted value for the third RG-accessible coefficient
is found to be within 7% relative |error| of its true value for n_f leq 6, and
is shown to be in exact agreement with its true value in the n_f \to \infty
limit. Asymptotic Pad\'e estimates are also obtained for the remaining
(RG-inaccessible) three-loop coefficient. Comparison is also made with recent
estimates of the three-loop contribution to the configuration-space
static-potential function.


title: Stable Superstring Relics and Ultrahigh Energy Cosmic Rays

abstract:
  One of the most intriguing experimental results of recent years is the
observation of Ultrahigh Energy Cosmic Rays (UHECRs) above the GZK cutoff.
Plausible candidates for the UHECR primaries are the decay products of a
meta--stable matter state with mass of order O(10^{12-15 GeV}), which
simultaneously is a good cold dark matter candidate. We study possible
meta-stable matter states that arise from Wilson line breaking of GUT
symmetries in semi-realistic heterotic string models. In the models that we
study the exotic matter states can be classified according to patterns of
SO(10) symmetry breaking. We show that cryptons, which are states that carry
fractional electric charge $\pm1/2$, and are confined by a hidden gauge group
cannot produce viable dark matter. This is due to the fact that, in addition to
the lightest neutral bound state, cryptons give rise to meta-stable charged
bound states. However, these states may still account for the UHECR events. We
argue that the uniton, which is an exotic Standard Model quark but carries
``fractional'' U(1)_{Z'} charge, as well as the singleton, which is a Standard
Model singlet with ``fractional'' U(1)_{Z'} charge do provide viable dark
matter candidates and can at the same time explain the observed UHECR events.


title: Flavour structure, flavour symmetry and supersymmetry

abstract:
  We discuss the role played by the horizontal flavour symmetry in
supersymmetric theories. In particular, we consider the horizontal symmetry
$SU(3)_H$ between the three fermion families and show how this concept can help
in explaining the fermion mass spectrum and mixing pattern in the context of
SUSY GUTs.


title:
Gauge Mediated Proton Decay in a Renormalizable SUSY SO(10) with
  Realistic Mass Matrices

abstract:
  Proton decay via d=5 operators is excluded by now not only in the framework
of SUSY SU(5) but also its extensions like SUSY SO(10) are on the verge of
being inconsistent with d=5 decays. It is reasonable therefore to suppress,
e.g. by a symmetry, the d=5 operators and to consider gauge boson induced d=6
decays. This is suggested in several recent papers in the framework of models
with a lighter $ M_X$. We discuss here explicitly the fermionic sector of such
a renormalizable SUSY SO(10) with realistic mass matrices. We find that the
recently ``observed'' large leptonic mixing leads to an enhancement of the
nucleon decay channels involving $\mu$'s and in particular the $\mu^+\pi^o$,
$\mu^+\pi^-$ modes.


title: Proton Stability in Six Dimensions

abstract:
  We show that Lorentz and gauge invariance explain the long proton lifetime
within the standard model in six dimensions. The baryon-number violating
operators have mass dimension 15 or higher. Upon TeV-scale compactification of
the two universal extra dimensions on a square $T^2/Z_2$ orbifold, a discrete
subgroup of the 6-dimensional Lorentz group continues to forbid dangerous
operators.


title:
Phenomenology of High Energy Neutrinos in Low-Scale Quantum Gravity
  Models

abstract:
  We show that neutrino telescopes, optimized for detecting neutrinos of TeV to
PeV energy, can reveal threshold effects associated with TeV-scale gravity. The
signature is an increase with energy of the cross section beyond what is
predicted by the Standard Model. The advantage of the method is that the
neutrino cross section is measured in an energy region where i) the models are
characteristically distinguishable and ii) the Standard Model neutrino cross
section can be reliably calculated so that any deviation can be conclusively
identified.


title: Assisted inflation via tachyon condensation

abstract:
  In this paper we propose a new mechanism of inflating the Universe with
non-BPS $D4$ branes which decay into stable $D3$ branes via tachyon
condensation. In a single brane scenario the tachyon potential is very steep
and unable to support inflation. However if the universe lives in a stack of
branes produced by a set of non-interacting unstable $\tilde {D4}$ branes, then
the associated set of tachyons may drive inflation along our 3 spatial
dimensions. After tachyon condensation the Universe is imagined to be filled
with a set of parallel stable $D3$ branes. We study the scalar density
perturbations and reheating within this setup.


title: Electroweak corrections to the observables of W-boson production at RHIC

abstract:
  The processes of the single W-production in hadron-hadron collisions are
suggested for investigation of the nucleon spin. An approach is proposed for
the determination of quark spin densities at low x. The lowest order
electroweak radiative corrections to the observable quantities are calculated.
The numerical calculations of the cross sections and the single spin
asymmetries taking into consideration the electroweak corrections at RHIC
energies have been made.


title: m_u+m_d From Isovector Pseudoscalar Sum Rules

abstract:
  We revisit the isovector pseudoscalar sum rule determination of m_u+m_d,
using families of finite energy sum rules known to be very accurately satisfied
in the isovector vector channel. The sum rule constraints are sufficiently
strong to allow a determination of both m_u+m_d and the excited resonance decay
constants. The corresponding Borel transformed sum rules are also very well
satisfied, providing a non-trivial consistency check on the treatment of direct
instanton contributions. We obtain [m_u+m_d](2 GeV)=7.8\pm 1.1 MeV (in the MS
bar scheme), only marginally compatible with the most recent sum rule
determinations, but in good agreement with recent unquenched lattice
extractions.


title:
Non-renormalization theorems in softly broken SQED and the soft
  $\beta$-functions

abstract:
  The renormalization of softly broken SQED is related to the one of
supersymmetric QED by using the construction with a local gauge supercoupling
and by taking into account softly broken anomalous axial U(1) symmetry. From
this extended model one obtains the non-renormalization theorems of SQED and
the counterterms of the soft breaking parameters as functions of the
supersymmetric counterterms. Due to the Adler-Bardeen anomaly of the axial
current an invariant regularization scheme does not exist, and therefore the
$\beta$-functions of soft breaking parameters are derived from an algebraic
construction of the Callan-Symanzik equation and of the renormalization group
equation. We obtain the soft $\beta$-functions in terms of the gauge
$\beta$-function and of the anomalous dimension of the supersymmetric matter
mass. In particular, we find that the X-term of the scalar mass
$\beta$-function as well as the gauge $\beta$-function in $l\geq 2$ are due to
the Adler-Bardeen anomaly of the axial symmetry.


title: An example of resonance saturation at one loop

abstract:
  We argue that the large-Nc expansion of QCD can be used to treat a Lagrangian
of resonances in a perturbative way. As an illustration of this we compute the
L_10 coupling of the Chiral Lagrangian by integrating out resonance fields at
one loop. Given a Lagrangian and a renormalization scheme, this is how in
principle one can answer in a concrete and unambiguous manner questions such as
at what scale resonance saturation takes place.


title: The $\pt$ spectrum of heavy quarks in photoproduction

abstract:
  We illustrate a formalism that allows to match the next-to-leading order
cross section for the photoproduction of heavy quarks to the cross section
obtained by resumming logarithms of $\pt/m$ to the next-to-leading accuracy,
thus giving a sensible prediction for any value of $\pt$. We present a
comparison between our predictions and H1 and ZEUS data.


title: Towards a global analysis of polarized parton distributions

abstract:
  We present a technique for implementing in a fast way, and without any
approximations, higher-order calculations of partonic cross sections into
global analyses of parton distribution functions. The approach, which is set up
in Mellin-moment space, is particularly suited for analyses of future data from
polarized proton-proton collisions, but not limited to this case. The
usefulness and practicability of this method is demonstrated for the
semi-inclusive production of hadrons in deep-inelastic scattering and the
transverse momentum distribution of ``prompt'' photons in pp collisions, and a
case study for a future global analysis of polarized parton densities is
presented.


title: Form factors of heavy-to-light B decays at large recoil

abstract:
  General relations between the form factors of B decays to light mesons are
derived using the heavy quark and large recoil expansion. On their basis the
complete account of contributions of second order in the ratio of the light
meson mass to the large recoil energy is performed. Both ground and excited
final meson states are considered. It is shown that most of the known form
factor relations remain valid after the inclusion of quadratic mass
corrections. The validity of some of such relations requires additional
equalities for the helicity amplitudes. It is found that all these relations
and equalities are fulfilled in the relativistic quark model based on the
quasipotential approach in quantum field theory. The contribution of 1/m_b
corrections to the branching fraction of the rare radiative B decay is
discussed.


title: CP Tagged Decays at SuperBaBar

abstract:
  We explore the possibility of measuring the CKM parameter gamma using CP
tagged decays at a very high luminosity e+e- B Factory. A new collider capable
of integrating as much as 10 inverse attobarns per year is being discussed as a
possible future for SLAC beyond the current PEP-II program, and could also be
in the future of KEK. In two years of operation, it could be possible for a
successor to BaBar or Belle to accumulate a sample of one million CP tagged B
decays. We find that a theoretically clean extraction of gamma with uncertainty
less than 5 degrees may be achievable in the analysis of such a data set.


title:
Inferring $\rhobar$ and $\etabar$ of the CKM matrix - A simplified,
  intuitive approach

abstract:
  This analysis is based on the same ideas and numerical inputs of the recent
paper by Ciuchini et al. on the subject. Some approximations are applied, which
make analytical calculations applicable in most of the work, thus avoiding
Monte Carlo integration. The final result is practically identical to the one
obtained by the more detailed numerical analysis.


title: Vector Meson Photoproduction at High-t and Comparison to HERA Data

abstract:
  We explore QCD calculations for the process gamma p -> V X where V is a
vector meson, in the region s >> -t and -t >> Lambda_QCD^2. We compare our
calculations for the J/psi, phi and rho mesons with data from the ZEUS
Collaboration at HERA and demonstrate that the BFKL approach is consistent with
the data even for light mesons, whereas the two-gluon exchange approach is
inadequate. We also predict the differential cross-sections for the Upsilon and
omega for which no data are currently available.


title:
Resummations with renormalon effects for the hadronic vacuum
  polarization contribution to the muon (g-2)

abstract:
  The hadronic vacuum polarization contribution to the muon (g-2) value is
calculated by considering a known dispersion integral which involves the $R_{e+
e-}(s)$ ratio. The theoretical part stemming from the region below 1.8 GeV is
the largest contribution in our approach, and is calculated by using a contour
integral involving the associated Adler function $D(Q^2)$. In the resummations,
we explicitly take into account the exactly known renormalon singularity of the
leading infrared renormalon in the usual and in the modified Borel transform of
$D(Q^2)$, and map further away from the origin the other renormalon
singularities by employing judiciously chosen conformal transformations. The
renormalon effect increases the predicted value of the hadronic vacuum
polarization contribution to the muon (g-2), and therefore diminishes the
difference between the recently measured and the SM/QCD-predicted value of
(g-2). It is also shown that the total QED correction to the hadronic vacuum
polarization is very small, about 0.06 percent.


title: CP Violation Search in $\tau\to \pi\pi^0\nu_{\tau}$ Decays

abstract:
  Using a sample of 12.2 million $\tau$-lepton pairs produced by $e^+e^-$
annihilation at $\sqrt{s}\sim 10.6 $GeV and collected by the CLEO detector, we
search for and set limits on CP violation in $\tau$-lepton decays. For each
event, we require that both $\tau$-leptons decay via the mode $\tau\ra
\pi\pi^0\nu$. The search is performed within the context of a multi-Higgs
Doublet Model and the imaginary part of the coupling constant parameterizing
the non-Standard Model diagram leading to CP violation is constrained to be
$-0.046 < \Im{(\Lambda}) < 0.022$ at 90% CL. The novel search technique is of
general utility.


title: HERWIG 6.3 Release Note

abstract:
  A new release of the Monte Carlo program HERWIG (version 6.3) is now
available. The main new features are new (MRST) built-in parton distribution
functions, more SM gauge boson production processes, 2 to 3 MSSM Higgs
production processes, an option to handle negative event weights, and an
interface to the CIRCE beamstrahlung program.


title:
Axially asymmetric fermion scattering off electroweak phase transition
  bubble walls with hypermagnetic fields

abstract:
  We show that in the presence of large scale primordial hypermagnetic fields,
it is possible to generate an axial asymmetry for a first order electroweak
phase transition. This happens during the reflection and transmission of
fermions off the true vacuum bubbles, due to the chiral nature of the fermion
coupling with the background field in the symmetric phase. We derive and solve
the Dirac equation for such fermions and compute the reflection and
transmission coefficients for the case when these fermions move from the
symmetric to the symmetry broken phase. We also comment on the possible
implications of such axial charge segregation processes for baryon number
generation.


title:
Higher twist and transverse momentum dependent parton distributions: a
  light-front hamiltonian approach

abstract:
  In order to study twist-3 and transverse momentum dependent parton
distributions, we use light-front time-ordered pQCD at order $\alpha_s$ to
calculate various distribution functions for a dressed quark target. This study
enables us to investigate in detail the existing relations between twist-3 and
transverse momentum dependent parton distributions. Our calculation shows
explicitly that two versions of such relations, considered to be equivalent,
occur in the literature which need to be distinguished. Moreover, we examine
sum rules for higher twist distributions. While the Burkhardt-Cottingham sum
rule for $g_2$ is fulfilled, the corresponding sum rule for $h_2$ is violated.


title: Precision determination of |V_{ub}| from inclusive decays

abstract:
  We propose determining |V_{ub}| from inclusive semileptonic B decay using
combined cuts on the leptonic and hadronic invariant masses to eliminate the
b->c background. Compared to a pure dilepton invariant mass cut, the
uncertainty from unknown order (\Lambda_{QCD}/m_b)^3 terms in the OPE is
significantly reduced and the fraction of b->u events is roughly doubled.
Compared to a pure hadronic invariant mass cut, the uncertainty from the
unknown light-cone distribution function of the b quark is significantly
reduced. We find that |V_{ub}| can be determined with theoretical uncertainty
at the 5-10% level.


title: Fractals in top non-leptonic decays

abstract:
  A study of the use of fractals in top non-leptonic decays for the sake of
discrimination against background is presented. Preliminary results show that
fractals may provide a useful check for top event enrichment techniques.


title:
Electroweak Radiative Corrections to Parity-Violating Electroexcitation
  of the $\Delta$

abstract:
  We analyze the degree to which parity-violating (PV) electroexcitation of the
$\Delta(1232)$ resonance may be used to extract the weak neutral axial vector
transition form factors. We find that the axial vector electroweak radiative
corrections are large and theoretically uncertain, thereby modifying the
nominal interpretation of the PV asymmetry in terms of the weak neutral form
factors. We also show that, in contrast to the situation for elastic electron
scattering, the axial $N\to\Delta$ PV asymmetry does not vanish at the photon
point as a consequence of a new term entering the radiative corrections. We
argue that an experimental determination of these radiative corrections would
be of interest for hadron structure theory, possibly shedding light on the
violation of Hara's theorem in weak, radiative hyperon decays.


title:
Second moment of quark structure function of the rho-meson in QCD sum
  rules

abstract:
  The second moments of the quark structure functions of the longitudinally and
transversally polarized rho-mesons are calculated in the framework of QCD sum
rules in external fields. Operators of dimension 4 and 6 are taken into
account. The results are: 0.84 for the longitudinal polarization, 0.5 for the
transversal polarization. The large difference between these values indicates
that the rho-meson polarization strongly influences the internal structure. In
particular, in the case of the longitudinally polarized rho-meson the gluon sea
is found to be strongly suppressed, it is less than 0.20 - 0.25, whereas in
usual hadron case -- about 0.4 - 0.5.


title: Coulomb Gauge QCD, Confinement, and the Constituent Representation

abstract:
  Quark confinement and the genesis of the constituent quark model are examined
in nonperturbative QCD in Coulomb gauge. We employ a self-consistent method to
construct a quasiparticle basis and to determine the quasiparticle interaction.
The results agree remarkably well with lattice computations. They also
illustrate the mechanism by which confinement and constituent quarks emerge,
provide support for the Gribov-Zwanziger confinement scenario, clarify several
perplexing issues in the constituent quark model, and permit the construction
of an improved model of low energy QCD.


title:
Large order behavior in perturbation theory of the pole mass and the
  singlet static potential

abstract:
  We discuss upon recent progress in our knowledge of the large order behavior
in perturbation theory of the pole mass and the singlet static potential. We
also discuss about the renormalon subtracted scheme, a matching scheme between
QCD and any effective field theory with heavy quarks where, besides the usual
perturbative matching, the first renormalon in the Borel plane of the pole mass
is subtracted.


title: Neutralinos in E_6 inspired supersymmetric U(1)' models

abstract:
  The neutralino sector in E_6 inspired supersymmetric models with extra
neutral gauge bosons and singlet Higgs fields contains additional gaugino and
singlino states compared to the MSSM. We discuss the neutralino mixing in rank
5 and rank 6 models and analyze the supersymmetric parameter space where the
light neutralinos have mainly singlino or MSSM character. The neutralino
character, resonance effects of the new gauge bosons and, assuming mSUGRA-type
RGEs, different selectron masses lead to significant differences between the
MSSM and the extended models in neutralino production at an e^+e^- linear
collider. Beam polarization may improve the signatures to distinguish between
the models. In an appendix, we present the mass terms of the gauge bosons,
charginos and sfermions which show a significant different mass spectrum than
in the MSSM and give all relevant neutralino couplings.


title: Higgs Radiation off Top Quarks at the Tevatron and the LHC

abstract:
  Higgs bosons can be searched for in the channels $p\bar p/pp\to t\bar tH+X$
at the Tevatron and the LHC. We have calculated the QCD corrections to these
processes in the Standard Model at next-to-leading order. The higher-order
corrections reduce the renormalization and factorization scale dependence
considerably and stabilize the theoretical predictions for the cross sections.
At the central scale $\mu=(2m_t+M_H)/2$ the properly defined $K$ factors are
slightly below unity for the Tevatron ($K \sim 0.8$) and slightly above unity
for the LHC ($K \sim 1.2$).


title:
Lepton Flavour Mixing Matrix and CP Violation from Neutrino Oscillation
  Experiments

abstract:
  The measurement of the charged-current 8B solar neutrino reaction on
deuterium at the Sudbury Neutrino Observatory confirms the neutrino oscillation
hypothesis for the solar neutrino problem, and the result favours the solution
with large neutrino mixing angles. We demonstrate that the current neutrino
oscillation data (including atmospheric and reactor neutrinos) are sufficient
to construct the lepton flavour mixing matrix with a reasonable accuracy. We
also infer the maximum size of CP violation effects consistent with the current
neutrino oscillation experiments.


title: Bi-maximal neutrino mixing and small U_{e3} from Abelian flavor symmetry

abstract:
  Atmospheric neutrino data strongly suggests a near-maximal \nu_\mu-\nu_{\tau}
mixing and also solar neutrino data can be nicely explained by another
near-maximal \nu_e-\nu_{\mu} or \nu_e-\nu_{\tau} mixing. We examine the
possibility that this bi-maximal mixing of atmospheric and solar neutrinos
arises naturally, while keeping U_{e3} and \Delta m^2_{sol}/\Delta m^2_{atm}
small enough, as a consequence of Abelian flavor symmetry. Two simple scenarios
of Abelian flavor symmetry within supersymmetric framework are considered to
obtain the desired form of the neutrino mass matrix and the charged lepton mass
matrix parameterized by the Cabibbo angle \lambda\approx 0.2. Future
experiments at a neutrino factory measuring the size of U_{e3} and the sign of
\Delta m^2_{32} could discriminate those scenarios as they predict distinctive
values of U_{e3} in connection with \Delta m^2_{sol}/\Delta m^2_{atm} and also
with the order of the neutrino mass eigenvalues.


title: Natural mu-term generation in supergravity scenario

abstract:
  We discuss a natural way to generate the mu-term in supergravity scenario.
Once the supergravity effects are taken into account, the vacuum expectation
values (VEVs) of the heavy fields are in general shifted from the values in the
supersymmetric limit. We note that this fact is independent of any Kahler
ansatz and the values of the VEV shifts are of the order of the gravitino mass.
As an example, an explicit model is presented, in which both of the mu-term and
the B-term of the electroweak scale are generated by the VEV shifts through the
supergravity effects. This model is a kind of the next to minimal
supersymmetric standard model, but there is no light standard model singlet
field. Also, we emphasize that our discussion can be naturally applied to the
supersymmetric grand unified theory.


title: Calculation of the Higgs Boson Mass Using the Complementarity Principle

abstract:
  We compute the Higgs mass in a model for the electroweak interactions based
on a confining theory. This model is related to the standard model by the
complementarity principle. A dynamical effect due to the large typical scale of
the Higgs boson shifts its mass above that of the W-bosons. We obtain m_H=129.6
GeV.


title:
Top quark spin correlations at hadron colliders: Predictions at
  next-to-leading order QCD

abstract:
  The collider experiments at the Tevatron and the LHC will allow for detailed
investigations of the properties of the top quark. This requires precise
predictions of the hadronic production of $t\bar t$ pairs and of their
subsequent decays. In this Letter we present for the reactions $p {\bar p}, p p
\to t{\bar t} + X \to \ell^+\ell'^-X$ the first calculation of the dilepton
angular distribution at next-to-leading order (NLO) in the QCD coupling,
keeping the full dependence on the spins of the intermediate $t\bar{t}$ state.
The angular distribution reflects the degree of correlation of the $t$ and
$\bar t$ spins which we determine for different choices of $t$ and $\bar t$
spin bases. In the case of the Tevatron, the QCD corrections are sizeable, and
the distribution is quite sensitive to the parton content of the proton.


title: Parton distributions for the pion in a chiral quark model

abstract:
  Parton distributions for the pion are studied in a chiral quark model
characterized by a quark propagator for which a spectral representation is
assumed. Electromagnetic and chiral symmetry constraints are imposed through
the relevant Ward-Takahashi identities for flavoured vertex functions.
Finiteness of the theory, requires the spectral function to be non-positive
definite. Straightforward calculation yields the result that the pion structure
function becomes one in the chiral limit, regardless of the details of the
spectral function. LO and NLO evolution provide a satisfactory description of
phenomenological parameterizations of the valence distribution functions but
fails to describe gluon and sea distributions.


title: Axial structure of the nucleon

abstract:
  We review the current status of experimental and theoretical understanding of
the axial nucleon structure at low and moderate energies. Topics considered
include (quasi)elastic (anti)neutrino-nucleon scattering, charged pion
electroproduction off nucleons and ordinary as well as radiative muon capture
on the proton.


title:
Electroweak Corrections to the Charged Higgs Boson Decay into Chargino
  and Neutralino

abstract:
  The electroweak corrections to the partial widths of the $H^+ \to
\tilde{\chi}^+_i \tilde{\chi}_j^0 (i=1,j=1,2)$ decays including one-loop
diagrams of the third generation quarks and squarks, are investigated within
the Supersymmetric Standard Model. The relative corrections can reach the
values about 10%, therefore they should be taken into account for the precise
experimental measurement at future colliders.


title: Two-Loop Jet Physics: Status and Prospects

abstract:
  I review the recent theoretical progress towards the computation of jet
observables at two loops in QCD.


title:
Quark correlations and gluon propagators in elastic vector meson
  production

abstract:
  We study the behavior of the differential cross section for vector meson
photoproduction at large momentum transfer in the two-gluon exchange model. We
focus on the treatment of two-quark correlation function in the proton and on
gluon propagators with a dynamically generated mass. We find that only the
large t region is sensitive to the particular details of these inputs.


title:
Pseudoscalar (Charged) Higgs Boson Production with $Z^0$
  ($W^{\pm}$)-Boson at Muon Colliders in the Models with Several Higgs Doublets
  and Singlets

abstract:
  Pseudoscalar and charged Higgs bosons production in the processes $\mu^+
\mu^-\to P^0_i Z^0$, $\mu^+\mu^- \to H^{\pm}W^{\mp}$ within the models with
several Higgs doublets and singlets is considered.


title: Status of Spin Physics

abstract:
  Fundamental spin physics has made striking progresses in the last years; new
ideas, experiments and data interpretations have been proposed and keep
emerging. A review of some of the most important issues in the spin structure
of nucleons is made and prospects for the future are discussed.


title: Doublet-Triplet Splitting in Realistic Heterotic String Derived models

abstract:
  There has been recently a surge of interest in Grand Unified Theories on
orbifolds of higher dimensional spaces. In particular, the higher dimensional
doublet-triplet splitting mechanism has been of much interest. I revisit the
superstring doublet-triplet splitting mechanism in which the color triplets are
projected out by the GSO projections, while leaving the electroweak doublets in
the physical spectrum. The connection with the higher dimensional theories is
elucidated. It is shown that the doublet-triplet splitting depends crucially on
the assignment of boundary conditions in the compactified directions.


title: Particle Candidates of Ultrahigh Energy Cosmic Rays

abstract:
  We discuss candidates for trans-GZK cosmic rays observed in a variety of
detectors. Three types of primaries are represented among the abstracts
submitted to this meeting: neutrin os causing a Z-burst, protons arising from
the decay of ultra-heavy metastable particles and neutrinos within the
framework of low scale string-like models of unification. We attempt to
evaluate the relative merits of these schemes. No definite conclusion can be
reached at this time. However, we point out that some schemes are more
credible/predictive than others. Data to be gathered by the Pierre Auger
observatories as well as orbiting detectors (OWL, Airwatch...) should be able
to decide between the various schemes.


title: Quarkonium hadron interaction in QCD

abstract:
  The analytic continuation of the operator product expansion of the scattering
amplitude allows to compute the heavy-quarkonium hadron total cross section.
The energy dependence of the Upsilon and Upsilon' cross sections with a proton
is discussed.


title:
Predictions for Higgs and SUSY spectra from SO(10) Yukawa Unification
  with mu > 0

abstract:
  We use $t, b, \tau$ Yukawa unification to constrain SUSY parameter space. We
find a narrow region survives for $\mu > 0$ (suggested by \bsgam and the
anomalous magnetic moment of the muon) with $A_0 \sim - 1.9 m_{16}$, $m_{10}
\sim 1.4 m_{16}$, $m_{16} \sim 1200 -3000$ \gev and $\mu, M_{1/2} \sim 100 -
500$ \gev. Demanding Yukawa unification thus makes definite predictions for
Higgs and sparticle masses.


title: Instantons in QCD: Theory and Application of the Instanton Liquid Model

abstract:
  Numerical and anaytical studies of the instanton liquid model have allowed
the determination of many hadronic parameters during the last 13 years. Most
part of this thesis is devoted to the extension of the analytical methods. The
meson correlation (polarization) functions are calculated in the instanton
liquid model including dynamical quark loops. The correlators are plotted and
masses and couplings of the $\sigma$, $\rho$, $\omega$, $a1$ and $f1$ are
obtained from a spectral fit. A separated analysis allows the determination of
the $\eta'$ mass too. The results agree with the experimental values on a 10%
level. Further I give some predictions for the proton form factors, which are
related to the proton spin (problem). A gauge invariant gluon mass for small
momenta is also calculated. At the end of the work some predictions are given,
which do not rely on the instanton liquid model. A gauge invariant quark
propagator is calculated in the one instanton background and is compared to the
regular and singular propagator. An introduction to the skill of choosing a
suitable gauge, especially a criterium for choosing regular or singular gauge,
is given. An application is the derivation of a finite relation betweewn the
quark condensate and the QCD scale $\Lambda$, where neither an infrared cutoff
nor a specific instanton model has been used. In general the instanton liquid
model exhibits an astonishing internal consistency and a good agreement with
the experimental data.


title: The Superfluid and Conformal Phase Transitions of Two-Color QCD

abstract:
  The phase structure of two-color QCD is examined as a function of the
chemical potential and the number of light quark flavors. We consider effective
Lagrangians for two-color QCD containing the Goldstone excitations, spin-one
particles and negative intrinsic parity terms. We discuss the possibility of a
conformal phase transition and the enhancement of the global symmetries as the
number of flavors is increased. The effects of a quark chemical potential on
the spin-one particles and on the negative intrinsic parity terms are analyzed.
It is shown that the phase diagram that is predicted by the linearly realized
effective Lagrangian at tree-level matches exactly that predicted by chiral
perturbation theory.


title: Solving the Strong CP and the SUSY Phase Problems with Parity Symmetry

abstract:
  We propose a simultaneous solution to the strong CP problem and the SUSY
phase problem based on parity symmetry realized when the supersymmetric
standard model is embedded into a left-right symmetric framework at a scale
near 2 x 10^{16} GeV, as suggested by neutrino masses and gauge coupling
unification. In this class of models, owing to parity, SUSY contributions to
the muon anomalous magnetic moment can be naturally large without conflicting
with the EDM of the electron and the neutron. The strong CP violation parameter
\theta is zero at the tree level, also due to parity (P), but is induced due to
P-violating effects below the unification scale. We estimate the induced \theta
to be < 10^{-16}, if we adopt a constrained supersymmetric spectrum with
universal scalar masses. In the more general SUSY breaking scenario, after
imposing flavor changing constraints, we find theta ~ (10^{-8}-10^{-10}), which
is compatible with, but not much below the present limit on neutron EDM. We
also argue that potential non-perturbative corrections to \theta from quantum
gravitational effects are not excessive in these models.


title: Next-to-Leading Order Results for t-tbar-h Production at the Tevatron

abstract:
  We compute the O(alpha_s^3) total cross section for the process (p pbar -> t
tbar h) in the Standard Model, at \sqrt{s}=2 TeV. The next-to-leading order
corrections drastically reduce the renormalization and factorization scale
dependence of the Born cross section and slightly decrease the total cross
section for renormalization and factorization scales between m_t and 2m_t.


title: Charm Physics - Like Botticelli in the Sistine Chapel

abstract:
  After sketching heavy quark expansions as applied to heavy flavour decays I
emphasize the relevance of nonperturbative dynamics at the charm scale for
exclusive $b\to c$ modes. I address the issue of quark-hadron duality for charm
and discuss both the experimental and theoretical status of $D^0-\bar D^0$
oscillations. Finally I argue that comprehensive CP studies of charm decays
provide novel portals to New Physics and suggest benchmark figures for
desirable sensitivities.


title: Meson propagators in spontaneously broken gauge theories

abstract:
  Contrary to common belief, the longitudinal vector meson and scalar meson
propagators have very different forms in spontaneously broken gauge theories.
We choose the Abelian-Higgs model as an example and show that the longitudinal
vector meson and scalar meson propagators have double poles by an extensive use
of the Ward-Takahashi identities.


title: Flavour symmetry breaking in the polarized nucleon sea

abstract:
  After a brief review on flavour symmetry breaking (FSB) in the unpolarized
nucleon sea, we discuss theoretical predications for FSB in the polarized
nucleon sea from meson cloud and `Pauli blocking'.


title:
Dressed Quark Propagator at Finite Temperature in the Schwinger-Dyson
  approach with the Rainbow Approximation - exact numerical solutions and their
  physical implication

abstract:
  The Schwinger-Dyson equation for the quark in the rainbow approximation at
finite temperature (T) is solved numerically without introducing any ansatz for
the dressed quark propagator. The dymanical quark mass-function and the
wave-function renormalization are found to have non-trivial dependence on
three-momentum, Matsubara-frequency and temperature. The critical temperature
of the chiral phase transition (T_c) and the T-dependence of the quark
condensate are highly affected by the wave-function renormalization. We found
that T_c \simeq 155 MeV which is consistent with the result of the finite
temperature lattice QCD simulation. It is also found that the system is not a
gas of free quarks but a highly interacting system of quarks and gluons even in
the chirally symmetric phase.


title:
Heavy quark hadroproduction in k_T-factorization approach and the
  experimental data

abstract:
  We compare the numerical predictions of the k_T-factorization approach
(semihard theory) for heavy quark production in high energy nucleon-nucleon and
photon-nucleon collisions with the experimental data from Tevatron-collider and
HERA. Predictions for heavy quark production at Tevatron, LHC and HERA are also
presented.


title:
CP violation in the lepton flavor violating interactions mu -> e gamma
  and tau -> mu gamma

abstract:
  We calculate the possible CP violating asymmetries for LFV decays mu -> e
gamma and tau -> mu gamma. Our predictions depend on the chosen new model
independent contribution. The result of measurements of such asymmetries for
these decays will open a new window to determine the physics beyond the SM.


title: Solving the Altarelli-Parisi equations with truncated moments

abstract:
  The technique of truncated moments of parton distributions allows us to study
scaling violations without making any assumption on the shape of parton
distributions. The numerical implementation of the method is however difficult,
since the evolution equations for truncated moments are not diagonal. We
present a simple way to improve the efficiency of the numerical solution of the
evolution equations for truncated moments. As a result, the number of truncated
moments needed to achieve the required precision in the evolution is
significantly smaller than in the original formulation of the technique. The
method presented here can also be used to obtain the value of parton
distributions in terms of truncated moments, and therefore it can be viewed as
a technique for the solution of the Altarelli-Parisi equations.


title:
Parametric Resonance Amplification of Neutrino Oscillations in
  Electromagnetic Wave with Varying Amplitude and "Castle Wall" Magnetic Field

abstract:
  Within the Lorentz invariant formalizm for description of neutrino evolution
in electromagnetic fields and matter we consider neutrino spin oscillations in
the electromagnetic wave with varying amplitude and in "castle wall" magnetic
field. It is shown for the first time that the parametric resonances of
neutrino oscillations in such systems can occur.


title: Understanding $B\to D^{*-}N\bar{N}$ and Its Implications

abstract:
  The CLEO Collaboration recently reported the observation of the $B^0\to
D^{*-}p\bar{n}$ mode at a rate only a factor of 4--5 lower than $B^0\to
D^{*-}\rho^+$ and $D^{*-}\pi^+$. We try to understand this with a factorization
approach of current produced nucleon pairs. The baryon weak vector current form
factors are related by isospin rotation to nucleon electromagnetic form
factors. By using $G^{p,n}_M$ measured from $e^+e^-\to \bar{N}N$ and
$p\bar{p}\to e^+e^-$ processes, assuming factorization of the $B^0\to D^{*-}$
transition and the $p\bar n$ pair production, we are able to account for up to
60% of the observed rate. The remainder is argued to arise from the axial
current. The model is then applied to B decays to other mesons plus $p\bar{n}$
modes and $D^{*-}$ plus strange baryon pairs.


title: Single sneutrino production in $\gamma\gamma$ collisions

abstract:
  We study the single production of sneutrinos with two leptons (or jets) via
$\gamma\gamma$ collision in an R-parity ($R_{p}$) violating supersymmetric
model. The subsequent decays of the sneutrino are also considered. The single
production of sneutrinos may provide a significant test of supersymmetry and
$R_p$-violation with flavour conserving and flavour changing final states. If
such processes coming from $R_p$ violation are not detected, the parameter
space of the model will be strongly constrained at the future Linear Collider.


title:
Measuring effective electroweak couplings in single top production at
  the LHC

abstract:
  We study the mechanism of single top production at the LHC in the framework
of an effective electroweak Lagrangian, analyzing the sensitivity of different
observables to the magnitude of the effective couplings that parametrize new
physics beyond the Standard Model. The observables relevant to the distinction
between left and right effective couplings involve in practice the measurement
of the spin of the top and this can be achieved only indirectly by measuring
the angular distribution of its decay products. We show that the presence of
effective right-handed couplings implies that the top is not in a pure spin
state. A unique spin basis is singled out which allows one to connect top decay
products angular distribution with the polarized top differential cross
section. We present a complete analytical expression of the differential
polarized cross section of the relevant perturbative subprocess including
general effective couplings. The mass of the bottom quark, which actually turns
out to be more relevant than naively expected, is retained. Finally we analyze
different aspects the total cross section relevant to the measurement of new
physics through the effective couplings. The above analysis also applies to
anti-top production in a straightforward way.


title: Inclusive Higgs boson and dijet production via Double Pomeron exchange

abstract:
  We evaluate Higgs boson and dijet cross-sections at the Tevatron collider via
Double Pomeron exchange when accompanying particles in the central region are
taken into account. Such {\it inclusive} processes, normalized to the observed
dijet rate observed at run I, noticeably increase the predictions for tagged
(anti)protons in the run II with respect to {\it exclusive} ones, with the
potentiality of Higgs boson detection.


title:
Nuclear Structure Functions and Heavy Flavour Leptoproduction Off the
  Nucleus at Small x in Perturbative QCD

abstract:
  Nuclear structure functions and cross-sections for heavy flavour production
in lepton-nucleus collisions are investigated in the low $x$ region accessible
now or in the near future. The scattering on a heavy nucleus is described by
the sum of fan diagrams of BFKL pomerons, which is exact in the high-colour
limit. The initial condition for the evolution at $x=0.01$ is taken from a
saturation model, which reproduces the experimental data on the proton. The $A$
dependence of the structure functions is well described by a power factor
$A^\alpha$, with $\alpha$ reaching values as low as 1/2 at extremely low $x$.
The total cross-sections for heavy flavour production reach values of the order
of mb, and the corresponding transverse momentum distributions are sizeable up
to transverse momenta larger than the initial large scale $\sqrt{Q^2+4m_f^2}$.


title: Soliton Formation in Chiral Quark Models

abstract:
  We describe how the non-local regularization can be implemented in the
calculation of solitons in the Nambu Jona-Lasinio model as well as in the
equivalent linear sigma-model. We investigate different forms of regulators and
show that the 3-momentum cut-off leads to serious conceptual difficulties.


title: High Density QCD

abstract:
  The dynamics of high partonic density QCD is presented considering, in the
double logarithm approximation, the parton recombination mechanism built in the
AGL formalism, developed including unitarity corrections for the nucleon as
well for nucleus. It is shown that these corrections are under theoretical
control. The resulting non linear evolution equation is solved in the
asymptotic regime, and a comprehensive phenomenology concerning Deep Inelastic
Scattering like $F_2$, $F_L$, $F_2^c$. $\partial F_2/ \partial \ln Q^2$,
$\partial F^A_2/ \partial \ln Q^2$, etc, is presented. The connection of our
formalism with the DGLAP and BFKL dynamics, and with other perturbative (K) and
non-perturbative (MV-JKLW) approaches is analised in detail. The phenomena of
saturation due to shadowing corrections and the relevance of this effect in ion
physics and heavy quark production is emphasized. The implications to e-RHIC,
HERA-A, and LHC physics and some open questions are mentioned.


title: Current Bounds on Technicolor with Scalars

abstract:
  Technicolor with scalars is the simplest dynamical symmetry breaking model
and one in which the predicted values of many observables may be readily
calculated. This letter applies current LEP, Tevatron, CESR, and SLAC data from
searches for neutral and charged scalars and from studies of b-quark physics to
obtain bounds on technicolor with scalars. Expectations for how upcoming
measurements will further probe the theory's parameter space are also
discussed.


title:
Solution to the 3-Loop $\Phi$-Derivable Approximation for Massless
  Scalar Thermodynamics

abstract:
  We develop a systematic method for solving the 3-loop $\Phi$-derivable
approximation to the thermodynamics of the massless $\phi^4$ field theory. The
method involves expanding sum-integrals in powers of $g^2$ and m/T, where g is
the coupling constant, m is a variational mass parameter, and T is the
temperature. The problem is reduced to one with the single variational
parameter m by solving the variational equations order-by-order in $g^2$ and
m/T. At the variational point, there are ultraviolet divergences of order $g^6$
that cannot be removed by any renormalization of the coupling constant. We
define a finite thermodynamic potential by truncating at $5^{th}$ order in g
and m/T. The associated thermodynamic functions seem to be perturbatively
stable and insensitive to variations in the renormalization scale.


title:
Semiclassical suppression of black hole production in particle
  collisions

abstract:
  It is argued that the cross section for production of large black holes, for
which a semiclassical description is applicable, cannot be given by the
geometric area of the black hole horizon, as claimed recently in the
literature. Rather the production cross section in a few-particle collision is
suppressed by at least a factor exp(-I_E) with I_E being the Gibbons-Hawking
(Euclidean) action for the black hole. Thus only essentially non-classical
small black holes with mass of the order of the Planck mass can possibly be
produced in few-particle collisions at trans-Planckian energies.


title: Effects of the Muon g-2 Anomaly on Dark Matter and Accelerator Physics

abstract:
  The effect of the recently observed 2.6 sigma deviation of the muon anomalous
magnetic moment (a_mu = (g_mu -2)/2) from its Standard Model prediction is
examined within the framework of supergravity models with grand unification and
R parity invariance. The constraints of the Higgs mass bounds, the b -> s gamma
bounds (including the large tan beta NLO corrections) and the cosmological
relic density of light neutralinos (including all slepton neutralino
coannihilation effects) are included in the analysis. For universal soft
breaking, the Higgs and b -> s gamma bounds puts a lower bound m_1/2 >~ 300
GeV, most of the parameter space now falling in the co-annihilation region. The
2 sigma lower bound on the magnetic moment anomaly places an upper bound of
m_1/2 ~< 800 GeV. It is seen that mSUGRA requires that a_mu ~< 50 \times
10^{-10}. One finds for m_h > 114 GeV, that tan beta > 5(7) for A_0 = 0(-4
m_1/2) and for m_h > 120 GeV, one has tan beta > 15 (10) for A_0 = 0(-4m_1/2).
The sparticle spectrum is now much constrained, and the reaches of the Tevatron
RUN II, NLC, and LHC for new physics discovery are discussed. Dark matter
detection rates are examined, and it is seen that future detectors now would be
able to scan most of the parameter space. Models with non-universal soft
breaking in the Higgs and third generation of squarks and sleptons are
exmained, and it is seen that a new Z s-channel annihilation of neutralinos in
the early universe is possible with dark matter detection rates accessible to
the next round of detectors.


title: Higgs Sector of the Minimal Left-Right Symmetric Model

abstract:
  We perform an exhaustive analysis of the most general Higgs sector of the
minimal left-right symmetric model (MLRM). We find that the CP properties of
the vacuum state are connected to the Higgs spectrum: if CP is broken
spontaneously, the MLRM does not approach the Standard Model in the limit of a
decoupling left-right symmetry breaking scale. Depending on the size of the CP
phases scenarios with extra non-decoupling flavor-violating doublet Higgses or
very light SU(2) triplet Higgses emerge, both of which are ruled out by
phenomenology. For zero CP phases the non-standard Higgses decouple only if a
very unnatural fine-tuning condition is fulfilled. We also discuss
generalizations to a non-minimal Higgs sector.


title: Interpreted History Of Neutrino Theory Of Light And Its Future

abstract:
  De Broglie's original idea that a photon is composed of a
neutrino-antineutrino pair bound by some interaction was severely modified by
Jordan. Although Jordan addressed an important problem (photon statistics) that
de Broglie had not considered, his modifications may have been detrimental to
the development of a composite photon theory. His obsession with obtaining Bose
statistics for the composite photon made it easy for Pryce to prove his theory
untenable. Pryce also indicated that forming transversely-polarized photons
from neutrino-antineutrino pairs was impossible, but others have shown that
this is not a problem. Following Pryce, Berezinskii has proven that any
composite photon theory (using fermions) is impossible if one accepts five
assumptions. Thus, any successful composite theory must show which of
Berezinskii's assumptions is not valid. A method of forming composite particles
based on Fermi and Yang's model will be discussed. Such composite particles
have properties similar to conventional photons. However, unlike the situation
with conventional photon theory, Lorentz invariance can be satisfied without
the need for gauge invariance or introducing non-physical photons.


title:
More Straightforward Extraction of the Fundamental Lepton Mixing
  Parameters from Long-Baseline Neutrino Oscillations

abstract:
  We point out the simple reversibility between the fundamental neutrino mixing
parameters in vacuum and their effective counterparts in matter. The former can
therefore be expressed in terms of the latter, allowing more straightforward
extraction of the genuine lepton mixing quantities from a variety of
long-baseline neutrino oscillation experiments. In addition to the
parametrization-independent results, we present the formulas based on the
standard parametrization of the lepton flavor mixing matrix and give a typical
numerical illustration.


title: Charm Quark Mass

abstract:
  We report on the result for the charm quark mass as obtained from our lattice
QCD computation in the quenched approximation. Our result in the MSbar scheme
is m_c(m_c)=1.26(4)(12) GeV.


title:
Chiral phase transition of bulk Abelian gauge theories in the
  Randall-Sundrum brane world

abstract:
  The chiral phase transition of strong-coupling Abelian gauge theories is
investigated in the brane world. It is assumed that gauge boson propagates in
an extra dimension, i.e. bulk gauge theories. The phase structure is
analytically evaluated by using the low-energy effective theories. We also
numerically solve the ladder Schwinger-Dyson equation for the full fermion
propagator including Kaluza-Klein (KK) excitation modes of the gauge field. It
is found that the chiral phase transition is of the second order, and the
critical value of the coupling constant is obtained. The extra dimension has a
large influence on the chiral phase transition for the Randall-Sundrum (RS)
brane world. It is studied how the number of KK modes affect the chiral phase
transition.


title:
Chiral quark model with infrared cut-off for the description of meson
  properties in hot matter

abstract:
  A simple chiral quark model of the Nambu--Jona-Lasinio (NJL) type with a
quark confinement mechanism is constructed for the description of the light
meson sector of QCD at finite temperature. Unphysical quark production
thresholds in the NJL model are excluded by an infrared cut-off in the momentum
integration within quark loop diagrams. This chiral quark model satisfies the
low energy theorems. Using the vacuum masses and decay widths of \pi- and
\rho-mesons for fixing the model parameters, the properties of the \sigma-
meson are derived. Within the Matsubara formalism, the model is systematically
extended to finite temperatures where chiral symmetry restoration due to a
dropping constituent quark mass entails a vanishing of the infrared cut-off
(deconfinement) at the pion Mott temperature T_c=186 MeV. Besides of the pion
mass and weak decay constant, the masses, coupling constants and decay widths
of \sigma- and \rho-mesons in hot matter are investigated. The quark-antiquark
decay channel of the light mesons is opened for T>T_c only and becomes
particularly strong for the \rho- meson. The two-pion decay channel below T_c
has almost constant width for the \rho- meson up to T_c, but for the
\sigma-meson it closes below T_c such that a scalar meson state with vanishing
width is obtained as a precursor of the chiral/deconfinement transition.


title: Electromagnetic corrections to gamma pi(+) -> pi(0) pi(+)

abstract:
  The amplitude for the anomalous transitions gamma pi(+) -> pi(0) pi(+) is
analyzed within Chiral Perturbation Theory including electromagnetic
interactions. The presence of a t-channel one-photon exchange contribution
induces sizeable e^2 corrections which enhance the cross-section in the
threshold region and bring the theoretical prediction into agreement with
available data. In the case of the crossed reaction gamma pi(0) -> pi(+) pi(-),
the same contribution appears in the s-channel and its effects are small.


title:
Gell-Mann - Oakes - Renner relation in a magnetic field at finite
  temperature

abstract:
  In the first order of chiral perturbation theory the corrections to
$F_{\pi^0}$ and $M_{\pi^0}$ in a magnetic field at finite temperature have been
found. It was shown that they are shifted in such a manner that Gell-Mann -
Oakes - Renner relation remains valid under these conditions.


title: Classical aspects of quantum fields far from equilibrium

abstract:
  We consider the time evolution of nonequilibrium quantum scalar fields in the
O(N) model, using the next-to-leading order 1/N expansion of the 2PI effective
action. A comparison with exact numerical simulations in 1+1 dimensions in the
classical limit shows that the 1/N expansion gives quantitatively precise
results already for moderate values of N. For sufficiently high initial
occupation numbers the time evolution of quantum fields is shown to be
accurately described by classical physics. Eventually the correspondence breaks
down due to the difference between classical and quantum thermal equilibrium.


title: On the fermionic signature of the lattice monopoles

abstract:
  We consider fermions in the field of static monopole-like configurations in
the Euclidean space-time. In all the cases considered there exists an infinite
number of zero modes, labeled by frequency i\omega. The existence of such modes
is a manifestation of instability of the vacuum in the presence of the
monopoles and massless fermions. In the Minkowski space the corresponding
phenomenon is well known and is a cornerstone of the theory of the magnetic
catalysis. Moreover, the well known zero mode of Jackiw and Rebbi corresponds
to the limiting case, \omega = 0. We provide arguments why the chiral
condensate could be linked to the density of the monopoles in the infrared
cluster. A mechanism which can naturally explain the equivalence of the
critical temperatures for the deconfinement and chiral transitions, is
proposed. We discuss possible implications for the phenomenology of the lattice
monopoles.


title: Theory of the Quark-Gluon Plasma

abstract:
  These lectures are an introduction to recent developments in the study of the
high temperature phase of QCD by using weak coupling techniques. After a brief
introduction to some techniques of quantum field theory at finite temperature,
I proceed to an analysis of the various important scales and degrees of freedom
of the quark-gluon plasma and focus on the effective theory for the collective
modes which develop at the particular momentum scale $gT$, where $g$ is the
gauge coupling and $T$ the temperature. A powerful technique to construct the
effective theory is based on kinetic equations which govern the dynamics of the
hard degrees of freedom. Some of the collective phenomena that are described by
this effective theory are briefly mentioned. Then I turn to the calculation of
the entropy of the quark-gluon plasma and show how the information coded in the
effective theory can be exploited in (approximately) self-consistent
calculations.


title:
The mirror world interpretation of the 1908 Tunguska event and other
  more recent events

abstract:
  Mirror matter is predicted to exist if parity (i.e. left-right symmetry) is a
symmetry of nature. Remarkably mirror matter is capable of simply explaining a
large number of contemporary puzzles in astrophysics and particle physics
including: Explanation of the MACHO gravitational microlensing events, the
existence of close-in extrasolar gas giant planets, apparently `isolated'
planets, the solar, atmospheric and LSND neutrino anomalies, the
orthopositronium lifetime anomaly and perhaps even gamma ray bursts. One
fascinating possibility is that our solar system contains small mirror matter
space bodies (asteroid or comet sized objects), which are too small to be
revealed from their gravitational effects but nevertheless have explosive
implications when they collide with the Earth. We examine the possibility that
the 1908 Tunguska explosion in Siberia was the result of the collision of a
mirror matter space body with the Earth. We point out that if the catastrophic
event and many other similar smaller events are manifestations of the mirror
world then these impact sites should be a good place to start digging for
mirror matter. Mirror matter could potentially be extracted and purified using
a centrifuge and have many useful industrial applications.


title: Suppressing the $\mu$ and neutrino masses by a superconformal force

abstract:
  The idea of Nelson and Strassler to obtain a power law suppression of
parameters by a superconformal force is applied to understand the smallness of
the $\mu$ parameter and neutrino masses in R-parity violating supersymmetric
standard models. We find that the low-energy sector should contain at least
another pair of Higgs doublets, and that a suppression of $\lsim O(10^{-13})$
for the $\mu$ parameter and neutrino masses can be achieved generically. The
superpotential of the low-energy sector happens to possess an anomaly-free
discrete R-symmetry, either $R_3$ or $R_6$, which naturally suppresses certain
lepton-flavor violating processes, the neutrinoless double beta decays and also
the electron electric dipole moment. We expect that the escape energy of the
superconformal sector is $\lsim$ O(10) TeV so that this sector will be
observable at LHC. Our models can accommodate to a large mixing among neutrinos
and give the same upper bound of the lightest Higgs mass as the minimal
supersymmetric standard model.


title:
Critical and tricritical exponents of the Gross-Neveu model in the
  large-$N_f$ limit

abstract:
  The critical and the tricritical exponents of the Gross-Neveu model are
calculated in the large-$N_f$ limit.
  Our results indicate that these exponents are given by the mean-field values.


title:
The contribution of off-shell gluons to the structure functions F_2^c
  and F_L^c$ and the unintegrated gluon distributions

abstract:
  We calculate the perturbative parts of the structure functions $F_2^c$ and
$F_L^c$ for a gluon target having nonzero transverse momentum squared at order
$\alpha_s$. The results of the double convolution (with respect to the Bjorken
variable $x_B$ and the transverse momentum) of the perturbative part and the
unintegrated gluon densities are compared with HERA experimental data for
$F_2^c$. The contribution from $F_L^c$ structure function ranges (10-30)% of
that of $F_2^c$ at the kinematical range of HERA experiments.


title:
Cross Sections, Probabilities, Multiplicities and Spectra of Secondaries
  in High Energy Heavy Ion Interactions

abstract:
  We present a short review of theoretical results (mainly for
experimentalists) published in many different papers. The formulae are
presented for the different integrated cross sections, the number of
interacting nucleons, multiplicities of secondaries, the dispersions of
multiplicity distributions. Two possible tests for the search of Quark-Gluon
Plasma formation are discussed. CERN SPS data for production of secondaries in
central Pb+Pb collisions are compared with Quark-Gluon String Model
predictions.


title:
$D_s$ decays to $\eta$ and $\eta^\prime$ final states: a
  phenomenological analysis

abstract:
  We consider the semileptonic and nonleptonic $D_s$ decay modes to final
states with $\eta$ and $\eta^\prime$. We use QCD sum rules to determine the
$D_s \to \eta$ form factor $f_+^\eta$, and a generalized factorization ansatz
to compute nonleptonic decays. We propose a parameterization of possible OZI
suppressed contributions producing the $\eta^\prime$ in the final state,
compatible with current data; such a scheme can be further constrained
improving the precision of the measurement of the $D_s$ decay rates, as
expected by the ongoing experiments.


title:
Soft-Gluon Resummation for the Fragmentation of Light and Heavy Quarks
  at Large x

abstract:
  We present a QCD study of fragmentation processes for light and heavy quarks
in the semi-inclusive region of large x. Large logarithmic terms, due to
soft-gluon radiation, are evaluated and resummed to all perturbative orders in
the QCD coupling alpha_s. Complete analytical results to next-to-leading
logarithmic accuracy are given for one-particle and two-particle inclusive
distributions in e+e- annihilation and DIS. Factorization of parton radiation
at low transverse momenta is exploited to identify the universal
(process-independent) perturbative fragmentation function that controls
heavy-quark processes, and to perform next-to-leading logarithmic resummation
of its soft-gluon contributions. To gauge the quantitative impact of
resummation, we perform numerical studies of light- and heavy-quark
fragmentation in e+e- collisions.