title:
Relationship of pionium lifetime with pion scattering lengths in
  generalized chiral perturbation theory

abstract:
  The pionium lifetime is calculated in the framework of the
quasipotential-constraint theory approach, including the sizable
electromagnetic corrections. The framework of generalized chiral perturbation
theory allows then an analysis of the lifetime value as a function of the pion
S-wave scattering lengths with isospins I=0,2, the latter being dependent on
the quark condensate value.


title: Implications of CP and CPT for production and decay of Majorana fermions

abstract:
  The consequences of CP- and CPT-invariance for production and subsequent
decay of Majorana fermions are analytically studied. We derive general symmetry
relations for the spin density matrix for production of Majorana fermions by
polarized fermion-antifermion annihilation which allow to distinguish Majorana
from Dirac fermions. We discuss the influence of the spin correlations on
energy and angular distributions of the decay products. Numerical results are
shown for the production of neutralinos and charginos with subsequent leptonic
decay at a future linear collider with longitudinally polarized beams.


title: On equations for neutrino propagation in matter

abstract:
  We study the dynamical equations for two-family neutrino oscillations in a
medium of continuously-varying density. We can find explicit solutions to these
equations in terms of series of nested integrals. These solutions can serve as
a basis for numerical calculation of these processes or for further study of
their analytical properties.


title: Improving alpha_QED(M_Z^2) and the charm mass by analytic continuation

abstract:
  The standard determination of the QED coupling on the Z pole is performed
using the latest available data for R. The direct application of analytic
continuation techniques is found not to improve the accuracy of the value of
\alpha(M_Z^2). However they help to resolve an ambiguity in the values of R in
the energy region \sqrt{s} < 2 GeV, which, in turn, reduces the uncertainty in
\alpha(M_Z^2). Moreover, they provide a sensitive determination of the mass of
the charm quark. The favoured solution, which uses the inclusive data for R for
\sqrt{s} < 2 GeV, has a pole mass m_c = 1.33-1.40 GeV and \alpha^{-1}(M_Z^2) =
128.972 +/- 0.026; whereas if the sum of the exclusive channels is used to
determine R in this region, we find \alpha^{-1}(M_Z^2) = 128.941 +/- 0.029.


title: Instanton-induced Inelastic Collisions in QCD

abstract:
  We show that the instanton-induced inelastic processes, leading to
multi-gluon production in in high-energy parton-parton scattering, are
considerably enhanced over the quasi-elastic ones, by a factor of 100.
  The basic instanton-induced inelastic contribution cause the parton-parton
cross section to increase as ${\rm ln} {s}$, and their Poisson resummation in
hadron-hadron scattering yield a regge-type cross section. The pomeron slope
and intercept due to instanton-induced contributions are evaluated. We show
that the small intercept is due to the diluteness of the instantons in the QCD
vacuum, while the small slope is related to the smallness of the instanton
sizes.


title: On Higgs Production in Photon Photon Collisions

abstract:
  I review recent progress on the Higgs production in gamma gamma collisions at
the photon mode of the Next Linear Collider (NLC). I mainly focus on two
particular topics. The first topic is the Higgs-two photon vertex, which is
sensitive to new physics, and can be considered a counter of the number of new
heavy particles. I recall the results on QCD and electroweak two loop radiative
corrections. The second topic is the heavy quark anti-quark pair production in
gamma gamma collisions, which is the dominant background process for the Higgs
production at m_H <150 GeV. We suggest a procedure for the resummation of
double (DL) and single (SL) logarithms in the process gamma gamma -> b anti-b.


title: On t anti-t threshold and top quark mass definition

abstract:
  In this talk we discuss the process e^+e^-\to t\bar t near threshold,
calculated with NNLO accuracy as well as top quark mass definitions adequate
for the threshold. As new definition we suggest the PS-bar mass which allows to
calculate recoil corrections to the static PS mass. Using this result we
calculate the cross section of e^+e^-\to t\bar t near threshold at NNLO
accuracy adopting three alternative approaches, namely (1) fixing the pole
mass, (2) fixing the PS mass, and (3) fixing the new mass which we call the
PS-bar mass. We demonstrate that perturbative predictions for the cross section
become much more stable if we use the PS or the PS-bar mass for the
calculations. A careful analysis suggests that the top quark mass can be
extracted from a threshold scan at NLC with an accuracy of about 100 MeV.


title: Scalar Mesons in QCD

abstract:
  We review the analysis of the quark and gluon substructures of the scalar
mesons from QCD spectral sum rules and some low-energy theorems applied to the
scalar QCD anomaly current. The present data favour equal components of \bar
uu+ \bar dd and of gg in the wave functions of the low-mass (below 1 GeV)
scalar mesons, which make the wide \sigma and the narrow f_0(980) as \eta'-like
particles, which can have strong couplings to meson pairs through OZI
violations. A coherent picture of the other I=0 scalar mesons spectra within
this mixing scheme is shortly discussed. We also expect the a_0(980) to be the
lowest isovector \bar ud state, and the K^*_0(1430) its \bar ds partner.


title: Four-Neutrino Scenarios

abstract:
  The main features of four-neutrino 3+1 and 2+2 mixing schemes are reviewed,
after a discussion on the necessity of at least four massive neutrinos if the
solar, atmospheric and LSND anomalies are due to neutrino oscillations.
Complete list of references on four-neutrino mixing at
http://www.to.infn.it/~giunti/neutrino


title: Perturbative Quantum Field Theory

abstract:
  This talk introduces perturbative quantum field on a heuristic level. It is
directed at an audience familiar with elements of quantum mechanics, but not
necessarily with high energy physics. It includes a discussion of the
strategies behind experimental tests of fundamental theories, and of the field
theory interpretations of these tests


title: Key Issues in Hadronic Physics

abstract:
  A group of fifty physicists met in Duck, NC, Nov. 6-9 to discuss the current
status and future goals of hadronic physics. The main purpose of the meeting
was to define the field by identifying its key issues, challenges, and
opportunities. The conclusions, incorporating considerable input from the
community at large, are presented in this white paper.


title:
A Phenomenological Model of the Baryons The Body Center Cubic Model of
  the Vacuum Material

abstract:
  From the quark confinement idea, we conjecture that the quarks compose
colorless particles (uud and udd - the Lee Particles) and then the Lee
Particles construct a body center cubic lattice in the vacuum. In terms of the
energy band theory, from the symmetries of the body center cubic periodic
field, we deduce the baryon spectrum (with a united mass formula) using only 2
flavored quarks u and d. We also predict some new baryons: $\Lambda^{0}$(2559),
$\Lambda_{C}^{+}$(6659), $\Lambda_{b}^{0}$(10159).... The experiments to find
the long lifetime baryon $\Lambda^{0}$(2559) should be done first.


title:
Semileptonic B Decays into Excited Charmed Mesons ($D_1$, $D^*_2$) in
  HQEFT

abstract:
  Exclusive semileptonic B decays into excited charmed mesons ($D_1$, $D^*_2$)
are studied up to the order of $1/m_Q$ in the framework of the heavy quark
effective field theory (HQEFT), which contains the contributions of both
particles and antiparticles. Two wave functions $\eta^b_0$ and $\eta^c_0$,
which characterize the contributions from the kinematic operator at the order
of $1/m_Q$, are calculated by using QCD sum rule approach in HQEFT. Zero recoil
values of other two wave functions $\kappa'_1$ and $\kappa'_2$ are extracted
from the excited charmed-meson masses. Possible effects from the spin-dependent
transition wave functions which arise from the magnetic operators at the order
of $1/m_Q$ are analyzed. It is shown that the experimental measurements for the
branching ratios of $B \to D_1 l\nu$ and $B \to D^*_2 l\nu$ can be understood
in the framework of HQEFT.


title: Zooming-in on Instantons at HERA

abstract:
  In view of the intriguing, preliminary search results for instanton-induced
events at HERA from the H1 collaboration, some important remaining theoretical
issues are discussed. Notably, the question is addressed, to which extent the
H1 analysis may be directly compared to our original predictions from
instanton-perturbation theory, since certain fiducial cuts are lacking in the
H1 data. Various theoretical uncertainties are evaluated and their impact on
the observed excess is discussed. An improved understanding of the experimental
findings along with an encouraging over-all agreement with our original
predictions seems to emerge.


title: Neutrinoless Double Beta Decay in the Dualized Standard Model

abstract:
  The Dualized Standard Model offers a {\it raison d'\^etre} for 3 fermion
generations and an explanation for their distinctive mass and mixing patterns,
reproducing to a reasonable accuracy the empirical mixing matrix and mass
spectrum for both quarks and leptons in terms of just a few parameters. With
its parameters thus fixed, the result is a highly predictive framework. In
particular, it is shown that it gives explicit parameter-free predictions for
neutrinoless double beta decays. For $^{76}Ge$, it predicts a half-life of
$10^{28}-10^{30}$ years, which satisfies the present experimental lower bound
of $1.8 \times 10^{25}$ years.


title: Electroweak Interactions: Summary

abstract:
  The session on precision studies of electroweak interactions is summarized.
The contributions address the bilinear, trilinear, quartic as well as
heavy-quark interactions of the electroweak gauge bosons. This makes up a
picture of the physics of electroweak symmetry and symmetry breaking which can
be investigated with the proposed design of e+e- Linear Colliders and
detectors.


title: Polarization of Upsilon(nS) at the Tevatron

abstract:
  The polarization of inclusive Upsilon(nS) at the Fermilab Tevatron is
calculated within the nonrelativistic QCD factorization framework. We use a
recent determination of the NRQCD matrix elements from fitting the CDF data on
bottomonium production from Run IB of the Tevatron. The result for the
polarization of Upsilon(1S) integrated over the transverse momentum bin 8 < p_T
< 20 GeV is consistent with a recent measurement by the CDF Collaboration. The
transverse polarization of Upsilon(1S) is predicted to increase steadily for
p_T greater than about 10 GeV. The Upsilon(2S) and Upsilon(3S) are predicted to
have significantly larger transverse polarizations than Upsilon(1S).


title:
Models of inflation, supersymmetry breaking and observational
  constraints

abstract:
  We review the connection between inflationary models and observations and
concentrate to describe models based on softly broken supersymmetry, in
particular running mass models, and their predictions. We then present a fit of
the spectral index of the curvature perturbation, assuming a flat $\Lambda$CDM
cosmology.


title:
Comment on stability of atoms and nuclei in multidimensional TeV scale
  gravity

abstract:
  We discuss the stability of atoms and nucleons in the presence of
multidimensional gravity characterized by the unified energy scale 1TeV. We
point out that the multidimensional gravitational attraction can create
additional bound states deep inside of atomic and nucleon constituents. These
states would be characterized by sizes comparable to the TeV scale distance. We
show that shallow gravity induced bound states between an electron and a quark
are ruled out, because collapse processes in atoms to such bound states would
occur on time scales which are in contradiction to current data on the
stability of ordinary matter. The gravitational attraction may also produce
diquark states, which should be considered in addition to those discussed in
the literature. The estimates indicate that, for TeV scale gravity, the problem
of UV divergencies and UV renormalization is crucial. Some universal
renormalization mechanism should exist, which stabilizes atoms in the presence
of multidimensional gravity.


title: Statistical Analysis of Solar Neutrino Data

abstract:
  We calculate with Monte Carlo the goodness of fit and the confidence level of
the standard allowed regions for the neutrino oscillation parameters obtained
from the fit of the total rates measured in solar neutrino experiments. We show
that they are significantly overestimated in the standard method. We also
calculate exact allowed regions with correct frequentist coverage. We show that
the exact VO, LMA and LOW regions are much larger than the standard ones and
merge together giving an allowed band at large mixing angles for all Delta m^2
> 10^{-10} eV^2.


title: The Naked Truth about Hadronic Regge Trajectories

abstract:
  We have reconstructed Regge trajectories (RT), using all existing data on
masses and spin-parities of all currently known hadrons. In this resonance
energy region meson and baryon RT are grossly nonlinear, and only 12% of all RT
could be classified as a linear, with $\sigma=0$, $\alpha'\simeq 0.9$
GeV${}^{-2}$.


title: New insights into the proton structure with ep collider HERA

abstract:
  Since its commissioning in 1991, the ep collider HERA has been running
successfully for almost a decade without stopping improving its performance. In
this report, the inclusive cross section and structure function measurements
for the deep inelastic scattering of neutral and charged current processes in
the full HERA kinematic domain are reviewed. The results are compared with the
Standard Model expectations for the deep inelastic scattering processes. The
new insights into the proton structure and on the underlying strong and
electroweak interactions are discussed.


title: Fermion mass effects in e+e- --> 4f and e+e- --> 4f gamma with cuts

abstract:
  The fermion mass effects in e+ e- --> 4f and in the corresponding
bremsstrahlung reactions in the presence of realistic cuts are studied. It is
shown that, for some four--fermion final states, the mass effects become
sizeable to the extent that they may affect the accuracy of theoretical
predictions which is required to be better than 1%.


title: B Physics at the Z0 Resonance

abstract:
  B physics results from e+ e- annihilation at the Z0 resonance are reviewed. A
vast program is summarised, including the study of B+, B0d, B0s and b baryon
lifetimes, the time dependence of B0d and B0s oscillations, the width
difference in the B0s system, and the measurements of the magnitudes of the CKM
matrix elements Vcb and Vub.


title: The Monte Carlo Event Generator DPMJET-III

abstract:
  A new version of the Monte Carlo event generator DPMJET is presented. It is a
code system based on the Dual Parton Model and unifies all features of the
DTUNUC-2, DPMJET-II and PHOJET 1.12 event generators. DPMJET-III allows the
simulation of hadron-hadron, hadron-nucleus, nucleus-nucleus, photon-hadron,
photon-photon and photon-nucleus interactions from a few GeV up to the highest
cosmic ray energies.


title: Subleading corrections to parity violating pion photoproduction

abstract:
  We compute the photon asymmetry $B_\gamma$ for near threshold parity
violating (PV) pion photoproduction through sub-leading order. We show that
sub-leading contributions involve a new combination of PV couplings not
included in previous analyses of hadronic PV. We argue that existing
constraints on the leading order contribution to $B_\gamma$ -- obtained from
the PV $\gamma$-decay of $^{18}$F -- suggest that the impact of the subleading
contributions may be more significant than expected from naturalness argumen


title:
Renormalization-Scale Invariance, Minimal Sensitivity, and the Inclusive
  Hadronic Decays of a 115 GeV Higgs Particle

abstract:
  Known perturbative expressions for the decay rates of 115 GeV Higgs particle
into either two gluons or a $b\bar{b}$ pair are shown to exhibit
renormalization-scale-($\mu$)-dependence that is largely removed via
renormalization-group/Pade-approximant estimates of these rates' next order
contributions. The extrema in $\mu$ characterizing both rates, as determined
from fully-known orders of perturbation theory, are very nearly equal to
corresponding $\mu$-insensitive rates obtained via estimation of their next
order contributions, consistent with "minimal-sensitivity" expectations.


title: A Pati-Salam model from branes

abstract:
  We explore the possibility of embedding the Pati-Salam model in the context
of Type I brane models. We study a generic model with U(4)_C x U(2)_L x U(2)_R
gauge symmetry and matter fields compatible with a Type I brane configuration.
Examining the anomaly cancellation conditions of the surplus abelian symmetries
we find an alternative hypercharge embedding that is compatible with a low
string/brane scale of the order of 5-7 TeV, when the U(4)_C and U(2)_R brane
stack couplings are equal. Proton stability is assured as baryon number is
associated to a global symmetry remnant of the broken abelian factors. It is
also shown that this scenario can accommodate an extra low energy abelian
symmetry that can be associated to lepton number. The issue of fermion and
especially neutrino masses is also discussed.


title: Composite Scalars at LEP: Constraining Technicolor Theories

abstract:
  LEPI and LEPII data can be used to constrain technicolor models with light,
neutral pseudo-Nambu-Goldstone bosons, Pa. We use published limits on branching
ratios and cross sections for final states with photons, large missing energy,
jet pairs, and b bbar pairs to constrain the anomalous Pa Z0 Z0, Pa Z0 photon,
and Pa photon photon couplings. From these results, we derive bounds on the
size of the technicolor gauge group and the number of technifermion doublets in
models such as Low-scale Technicolor.


title: High energy photon-neutrino elastic scattering

abstract:
  The one-loop helicity amplitudes for the elastic scattering process
$\gamma\nu\to\gamma\nu$ in the Standard Model are computed at high center of
mass energies. A general decomposition of the amplitudes is utilized to
investigate the validity of some of the key features of our results. In the
center of mass, where $\sqrt{s} = 2\omega$, the cross section grows roughly as
$\omega^6$ to near the threshold for $W$-boson production, $\sqrt{s} = m_W$.
Although suppressed at low energies, we find that the elastic cross section
exceeds the cross section for $\gamma\nu\to\gamma\gamma\nu$ when $\sqrt{s}>13 $
GeV. We demonstrate that the scattered photons are circularly polarized and the
net value of the polarization is non-zero. Astrophysical implications of high
energy photon-neutrino scattering are discussed.


title: CP asymmetry in the Higgs decay into the top pair due to the stop mixing

abstract:
  We investigate a potentially large CP violating asymmetry in the decay of a
neutral scalar or pseudoscalar Higgs boson into the top-anti-top pair. The
source of the CP nonconservation is the complex mixing in the (left-right) stop
sector. One of the interesting consequence is the different rates of the Higgs
boson decays into CP conjugate polarized states.


title: Collider Implications of Kaluza-Klein Excitations of the Gluons

abstract:
  We consider an asymmetric string compactification scenario in which the SM
gauge bosons can propagate into one TeV$^{-1}$-size extra compact dimension.
These gauge bosons have associated KK excitations that present additional
contributions to the SM processes. We calculate the effects that the KK
excitations of the gluons, $g^{\star}$'s, have on multijet final state
production in proton-proton collisions at the Large Hadron Collider energy. In
the case of dijet final states with very high $p_{{}_T}$, the KK signal due to
the exchanges of the $g^{\star}$'s is several factors greater than the SM
background for compactification scales as high as about 7 TeV. The
high-$p_{{}_T}$ effect is not as dramatic for the direct production of a single
on-shell $g^{\star}$, which subsequently decays into $q$-$\bar{q}$ pairs, where
the KK signal significantly exceeds the SM three-jet background for
compactification scales up to about 3 TeV. We also present our results for the
four-jet final state signal from the direct production of two on-shell
$g^{\star}$'s.


title: Generating Feynman Diagrams and Amplitudes with FeynArts 3

abstract:
  This paper describes the Mathematica package FeynArts used for the generation
and visualization of Feynman diagrams and amplitudes. The main features of
version 3 are: generation of diagrams at three levels, user-definable model
files, support for supersymmetric models, and publication-quality Feynman
diagrams in PostScript or LaTeX.


title:
Phenomenology of multiple parton radiation in semi-inclusive
  deep-inelastic scattering

abstract:
  In the current region of semi-inclusive deep-inelastic scattering, most
events are accompanied by intensive radiation of soft and collinear partons
which cannot be reliably described at any fixed order of perturbative QCD. In
this paper, a resummation formalism that describes such multiple parton
radiation is compared to the HERA data on semi-inclusive DIS, including the
distributions of energy flow and charged particle multiplicity. We show that
the resummation of multiple parton radiation improves the agreement between the
theory and the data. We make some suggestions on further experimental study of
multiple parton radiation at HERA.


title: Azimuthal asymmetries at HERA: theoretical aspects

abstract:
  We comment on theoretical aspects of the measurement of azimuthal asymmetries
in semi-inclusive charged particle production, made recently by the ZEUS
Collaboration at HERA. By taking the ratio of the two measured asymmetries, we
find good agreement between the perturbative QCD prediction and the
experimental data. To separate the perturbative and nonperturbative
contributions to the asymmetries, we suggest that the azimuthal asymmetries of
the transverse energy flow be measured as a function of a variable $q_T$
related to the pseudorapidity of the energy flow.


title: Electroweak symmetry breaking and extra dimensions

abstract:
  The electroweak symmetry may be broken by a composite Higgs which arises
naturally as a bound state of the top quark if the standard model gauge fields
and fermions propagate in extra dimenions. The top quark mass and the Higgs
mass can be predicted from the infrared fixed points of the renormalization
group equations. The top quark mass is in good agreement with the experimental
value, and the Higgs boson mass is predicted to be $\sim 200$ GeV. The bounds
on the compactification scale can be quite low if all standard model fields
propagate in the same extra dimensions due to the momentum conservation in
extra dimensions. The current lower limits are about 300 GeV for one extra
dimension and 400-800 GeV for two extra dimensions. The future collider
experiments may either discover the Kaluza-Klein (KK) states of the standard
model fields or raise their mass limits significantly. There may also be some
other light bound states which could be observed at upcoming collider
experiments.


title: Predictive SUSY GUT Model for CP Violation, Fermion Masses and Mixings

abstract:
  CP violation, fermion masses and mixing angles including that of neutrinos
are studied in an SUSY SO(10)$\times \Delta (48)\times$ U(1) model. The
nonabelian SU(3) discrete family symmetry $\Delta(48)$ associated with a simple
scheme of U(1) charge assignment on various fields concerned in superpotential
leads to unique Yukawa coupling matrices with zero textures. Thirteen
parameters involving masses and mixing angles in the quark and charged lepton
sector are successfully predicted by only four parameters. The masses and
mixing angles for the neutrino sector could also be predicted by constructing
an appropriate heavy Majorana neutrino mass matrix without involving new
parameters. It is found that the atmospheric neutrino deficit, the mass limit
put by hot dark matter and the LSND $\bar{\nu}_{\mu} \to \bar{\nu}_{e}$ events
may simultaneously be explained, but solar neutrino puzzle can be solved only
by introducing a sterile neutrino. An additional parameter is added to obtain
the mass and mixing of the sterile neutrino. The hadronic parameters $B_{K}$
and $f_{B}\sqrt{B}$ are extracted from the observed $K^{0}$-$\bar{K}^{0}$ and
$B^{0}$-$\bar{B}^{0}$ mixings respectively. The direct CP violation
($\epsilon'/\epsilon$) in kaon decays and the three angles $\alpha$, $\beta$
and $\gamma$ of the unitarity triangle in the CKM matrix are also presented.
More precise measurements of $\alpha_{s}(M_{Z})$, $|V_{cb}|$,
$|V_{ub}/V_{cb}|$, $m_{t}$, as well as various CP violation and neutrino
oscillation experiments will provide an important test for the present model
and guide us to a more fundamental theory.


title: Confinement as crossover

abstract:
  The order parameter of confinement together with the haaron model of the QCD
vacuum is reviewed and it is pointed out that confining forces are generated by
the non-renormalizable, invariant Haar-measure vertices of the path integral. A
hybrid model is proposed for the description of the crossover leading to the
confining vacuum. This scenario suggests that the differences between the low
and the high temperature phases of QCD should be looked for in the quark
channels instead of the hadronic sector.


title: Pseudo-Dirac Scenario for Neutrino Oscillations

abstract:
  We argue how pseudo-Dirac scenario for neutrinos leads to rich neutrino
oscillation phenomena, including oscillation inside each generation. The
pseudo-Dirac scenario is generalized by incorporating generation mixings and
formulae for the various neutrino oscillations are derived. As the application
we compare the formulae with the corresponding data. We find that observed
pattern of mixings, such as almost maximal mixing in the atmospheric neutrino
oscillation, is naturally explained in the generalized Pseudo-Dirac scenario
with small generation mixings. We, however, also point out that there remain
some problems to be settled for this scenario to be viable. The possible
theoretical framework to realize the pseudo-Dirac scenario is also briefly
commented on.


title: On the eta-eta' complex in the SD-BS approach

abstract:
  The bound-state Schwinger-Dyson and Bethe-Salpeter (SD-BS) approach is
chirally well-behaved and provides a reliable treatment of the eta-eta' complex
although a ladder approximation is employed. Allowing for the effects of the
SU(3) flavor symmetry breaking in the quark-antiquark annihilation, leads to
the improved eta-eta' mass matrix.


title: Uncertainties on Atmospheric Neutrino Flux Calculations

abstract:
  The strong evidence of new physics coming from atmospheric neutrino
experiments has motivated a series of critical studies to test the robustness
of the available flux calculations. In view of a more precise determination of
the parameters of new physics, new and more refined flux calculations are in
progress. Here we review the most important sources of theoretical
uncertainties which affect these computations, and the attempts currently under
way to improve them.


title:
$\etap K$ puzzle of B meson decays and new physics effects in the
  general two-Higgs-doublet model

abstract:
  we calculate the new physics contributions to seven measured decays $B \to
\pi^+ \pi^-, K \pi$ and $ K \etap$ in the general two-Higgs-doublet model
(Model III). Within the considered parameter space, we find that: (a) the
CLEO/BaBar measurement of $B\to \pi^+ \pi^-$ decay prefers a small
$F_0^{B\pi}(0)$: $F_0^{B\pi}(0)=0.25 \pm 0.03$; (b) the new physics
enhancements to the penguin-dominated $B \to K\pi$ and $B\to K \etap$ decays
are significant in size, $\sim (40-70)%$ $w.r.t$ the standard model
predictions; and (c) the new physics enhancements can boost the branching
ratios ${\cal B}(B \to K^+ \etap)$ and ${\cal B}(B \to K^0 \etap)$ to be
consistent with the data within one standard deviation, and hence lead to a
simple and plausible new physics interpretation for the $\etap K$ puzzle.


title:
Quantum Violations of the Equivalence Principle in a Modified
  Schwarzschild Geometry. Neutrino Oscillations

abstract:
  Neutrino flavour oscillations are analyzed in a model in which particles
experience an effective Schwarzschild geometry modified by maximal acceleration
corrections. These imply a quantum violation of the equivalence principle. The
corresponding shifts in the phase of the neutrino mass eigenstates are
calculated and discussed.


title: $B \to \pi\pi$ Decay in QCD

abstract:
  A new method is suggested to calculate the $B\to \pi\pi$ hadronic matrix
elements from QCD light-cone sum rules. To leading order in $\alpha_s$ and
$1/m_b$, the sum rule reproduces a factorizable matrix element, in accordance
with the prediction of the QCD factorization approach. Whereas the QCD
factorization can only take into account the nonfactorizable corrections
induced by hard-gluon exchanges, the method suggested here also allows a
systematic inclusion of soft-gluon effects. In this paper, I concentrate on the
latter aspect and present a calculation of the nonfactorizable soft-gluon
exchange contributions to $B\to \pi\pi$. The result, including twist 3 and 4
terms, is suppressed by one power of $1/m_b$ with respect to the factorizable
amplitude. Despite its numerical smallness, the soft effect is at the same
level as the $O(\alpha_s)$ correction to the QCD factorization formula for
$B\to \pi\pi$. The method suggested here can be applied to matrix elements of
different topologies and operators and to various other B-decay channels. I
also comment on the earlier applications of QCD sum rules to nonleptonic decays
of heavy mesons.


title:
Equivalence between Gaussian averaged neutrino oscillations and neutrino
  decoherence

abstract:
  In this paper, we show that a Gaussian averaged neutrino oscillation model is
equivalent to a neutrino decoherence model. Without loss of generality, the
analysis is performed with two neutrino flavors. We also estimate the damping
(or decoherence) parameter for atmospheric neutrinos and compare it to earlier
obtained results.


title:
The anomalous gamma -> pi^+ pi^0 pi^- form factor and the light-quark
  mass functions at low momenta

abstract:
  The gamma -> 3 pi form factor was calculated in a simple-minded constituent
model with a constant quark mass parameter, as well as in the Schwinger-Dyson
approach. The comparison of these and various other theoretical results on this
anomalous process, as well as the scarce already available data (hopefully to
be supplemented by more accurate CEBAF data), seem to favor Schwinger-Dyson
modeling which would yield relatively small low-momentum values of the
constituent (dynamically dressed) quark mass function.


title: QCD-like Theories at Finite Baryon and Isospin Density

abstract:
  We use 2-color QCD as a model to study the effects of simultaneous presence
of chemical potentials for isospin charge, $\mu_I$, and for baryon number,
$\mu_B$. We determine the phase diagrams for 2 and 4 flavor theories using the
method of effective chiral Lagrangians at low densities and weak coupling
perturbation theory at high densities. We determine the values of various
condensates and densities as well as the spectrum of excitations as functions
of $\mu_I$ and $\mu_B$. A similar analysis of QCD with quarks in the adjoint
representation is also presented. Our results can be of relevance for lattice
simulations of these theories. We predict a phase of inhomogeneous condensation
(Fulde-Ferrel-Larkin-Ovchinnikov phase) in the 2 colour 2 flavor theory, while
we do not expect it the 4 flavor case or in other realizations of QCD with a
positive measure.


title: Can Supersymmetric Loops Correct the Fermion Mass Relations in SU(5)?

abstract:
  We investigate three different possibilities for improving the fermion mass
relations that arise in grand unified theories (GUTs). Each scenario relies on
supersymmetric loop effects alone, without modifying the naive Yukawa
unification. First, we consider A-terms that follow the usual proportionality
condition. In this case SUSY effects can improve the mass relations, but not
completely. Interestingly, imposing Yukawa coupling unification for two
families greatly constrains the range of parameters in the MSSM. Secondly, we
employ a new ansatz for the tri-linear A-terms that satisfies all experimental
and vacuum stability bounds, and can successfully modify the mass relations.
Finally, we investigate the use of general (non-proportional) A-terms, with
large off-diagonal entries. In this case flavor changing neutral current (FCNC)
data present an important constraint. We do not pretend to present a complete,
motivated theory of fermion masses. Rather this paper can be viewed as an
existence proof, serving to show that Yukawa coupling unification can occur
even within the framework of minimal GUTs.


title:
Baryon and strangeness enhancement at SPS, RHIC and LHC energies in the
  String Fusion Model

abstract:
  Strangeness and baryon enhancement in heavy ion collisions are discussed in
the framework of the String Fusion Model. The Monte Carlo version of this model
is shown to reasonably reproduce three of the features that have been pointed
out as evidences of the finding of the Quark Gluon Plasma. Namely
hyperon/antihyperon enhancement, dependence of the slope of the $p_{T}$
distributions on the mass of the produced particles and on the centrality of
the collision, are described. Predictions for RHIC and LHC energies are
presented.


title: Dark Matter Implications for Linear Colliders

abstract:
  The existence of dark matter is currently one of the strongest motivations
for physics beyond the standard model. Its implications for future colliders
are discussed. In the case of neutralino dark matter, cosmological bounds do
not provide useful upper limits on superpartner masses. However, in simple
models, cosmological considerations do imply that for supersymmetry to be
observable at a 500 GeV linear collider, some signature of supersymmetry must
appear before the LHC.


title:
Unitarized pseudoscalar meson scattering amplitudes in three flavor
  linear sigma models

abstract:
  The three flavor linear sigma model is studied as a ``toy model'' for
understanding the role of possible light scalar mesons in the \pi \pi, \pi K
and \pi \eta scattering channels. The approach involves computing the tree
level partial wave amplitude for each channel and unitarizing by a simple
K-matrix prescription which does not introduce any new parameters. If the
renormalizable version of the model is used there is only one free parameter.
While this highly constrained version has the right general structure to
explain \pi \pi scatteirng, it is ``not quite'' right. A reasonable fit can be
made if the renormalizability (for the {\it effective} Lagrangian) is relaxed
while chiral symmetry is maintained. The occurence of a Ramsauer Townsend
mechanism for the f_0(980) region naturally emerges. The effect of
unitarization is very important and leads to ``physical'' masses for the scalar
nonet all less than about 1 GeV. The a_0(1450) and K_0^*(1430) appear to be
``outsiders'' in this picture and to require additional fields. Comparison is
made with a scattering treatment using a more general non-linear sigma model
approach. In addition some speculative remarks and a highly simplified larger
toy model are devoted to the question of the quark substructure of the light
scalar mesons.


title:
Radiative decay of a massive particle and the non-thermal process in
  primordial nucleosynthesis

abstract:
  We consider the effects on big bang nucleosynthesis (BBN) of the radiative
decay of a long-lived massive particle. If high-energy photons are emitted
after the BBN epoch ($t \sim 1 - 10^3$ sec), they may change the abundances of
the light elements through photodissociation processes, which may result in a
significant discrepancy between standard BBN and observation. Taking into
account recent observational and theoretical developments in this field, we
revise our previous study constraining the abundance of the
radiatively-decaying particles. In particular, on the theoretical side, it was
recently claimed that the non-thermal production of $^6$Li, which is caused by
the photodissociation of $\hefour$, most severely constrains the abundance of
the radiatively-decaying particle. We will see, however, it is premature to
emphasize the importance of the non-thermal production of $^6$Li because (i)
the theoretical computation of the $^6$Li abundance has large uncertainty due
to the lack of the precise understanding of the $^6$Li production cross
section, and (ii) the observational data of $^6$Li abundance has large errors.


title: Determination of polarized parton distribution functions

abstract:
  We study parametrization of polarized parton distribution functions in the
\alpha_s leading order (LO) and in the next-to-leading order (NLO). From \chi^2
fitting to the experimental data on A_1, optimum polarized distribution
functions are determined. The quark spin content \Delta\Sigma is very sensitive
to the small-x behavior of antiquark distributions which suggests that small-x
data are needed for precise determination of \Delta\Sigma. We propose three
sets of distributions and also provide FORTRAN library for our distributions.


title: QCD Pomeron at Linear Colliders

abstract:
  Recent developments in theory on the calculation of \gamma^* \gamma^*
reaction at high energies, in the aim of detecting the BFKL Pomeron signals,
are briefly introduced. The importance of the NLO QCD corrections to the Photon
Impact Factor in the game is highlighted.


title:
Production Processes as a Tool to Study Parameterizations of Quark
  Confinement

abstract:
  We introduce diquarks as separable correlations in the two-quark Green's
function to facilitate the description of baryons as relativistic three-quark
bound states. These states then emerge as solutions of Bethe-Salpeter equations
for quarks and diquarks that interact via quark exchange. When solving these
equations we consider various dressing functions for the free quark and diquark
propagators that prohibit the existence of corresponding asymptotic states and
thus effectively parameterize confinement. We study the implications of
qualitatively different dressing functions on the model predictions for the
masses of the octet baryons as well as the electromagnetic and strong form
factors of the nucleon. For different dressing functions we in particular
compare the predictions for kaon photoproduction, $\gamma p\to K\Lambda$, and
associated strangeness production, $pp\to pK\Lambda$ with experimental data.
This leads to conclusions on the permissibility of different dressing
functions.


title: Analytic Perturbation Theory for QCD observables

abstract:
  The connection between ghost-free formulations of RG-invariant perturbation
theory in the both Euclidean and Minkowskian regions is studied. Our basic tool
is the "double spectral representation", similar to definition of Adler
function, that stems from first principles of local QFT. It relates real
functions defined in the Euclidean and Minkowskian regions. On this base we
establish a simple relation between -- The trick of resummation of the
$\pi^2$-terms (known from early 80s) for the invariant QCD coupling and
observables in the time-like region and -- Invariant Analytic Approach (devised
a few years ago) with the "analyticized" coupling $\alpha_{\rm an}(Q^2)$ and
nonpower perturbative expansion for observables in the space-like domain which
are free of unphysical singularities . As a result, we formulate a
self-consistent scheme, Analytic Perturbation Theory (APT), that relates a
renorm-invariant, effective coupling functions $\alpha_{an}(Q^2) $ and
$\tilda{alpha}(s),$ as well as non-power perturbation expansions for
observables in both space- and time-like domains, that are free of extra
singularities and obey better convergence in the infrared region. Then we
consider the quark threshold crossing and devise a global APT scheme for the
data analysis in the whole accessible space-like and time-like domain with
various numbers of active quarks. Preliminary estimates indicate that this
global scheme produces results a bit different, sometimes even in the
five-flavour region, on a few per cent level for $\bar{\alpha}_s$ -- from the
usual one, thus influencing the total picture of the QCD parameter correlation.


title: Is there still a strong CP problem?

abstract:
  The role of a chiral U(1) phase in the quark mass in QCD is analysed from
first principles. In operator formulation, there is a parity symmetry and the
phase can be removed by a change in the representation of the Dirac gamma
matrices. Moreover, these properties are also realized in a Pauli-Villars
regularized version of the theory. In the functional integral scenario,
attempts to remove the chiral phase by a chiral transformation are thought to
be obstructed by a nontrivial Jacobian arising from the fermion measure and the
chiral phase may therefore seem to break parity. But if one starts from the
regularized action with the chiral phase also present in the regulator mass
term, the Jacobian for a combined chiral rotation of quarks and regulators is
seen to be trivial and the phase can be removed by a combined chiral rotation.
This amounts to a taming of the strong CP problem.


title:
On the group velocity of oscillating neutrino states and the equal
  velocity assumption

abstract:
  In a two flavour world, the usual equal $p$, equal $E$, or equal $v$
assumptions used to derive the neutrino oscillation length can be replaced by a
specific definition of the velocity of the oscillating state which, unlike
those assumptions, is compatible with exact production kinematics. This
definition is further vindicated by the analysis of $\pi_{\mu 2}$ decay at
rest.


title:
Experimental implications of the dual colour solution to the generation
  puzzle

abstract:
  Apart from offering explanations not only for the distinctive fermion mass
and mixing patterns but also for the actual values of the mass and mixing
parameters, the dual colour solution to the generation puzzle gives numerous
detailed predictions ranging from rare FCNC meson decays and $\mu$-$e$
conversions in nuclei at low energies to cosmic ray air showers with energies
beyond $10^{20}$ eV at the extreme end of the experimental range. Besides, it
predicts a new class of flavour-violating phenomena (called transmutations) due
to the rotating fermion mass matrix which are unambiguously calculable.
Comparison with experiment of these many ``parameter-free'' predictions reveals
no violation of existing bounds but identifies several striking effects which
can be tested with present experimental sensitivity.


title:
String models of glueballs and the spectrum of SU(N) gauge theories in
  2+1 dimensions

abstract:
  The spectrum of glueballs in 2+1 dimensions is calculated within an extended
class of Isgur-Paton flux tube models and is compared to lattice calculations
of the low-lying SU(N) glueball mass spectra. Our modifications of the model
include a string curvature term and different ways of dealing with the flux
tube width. We find that the generic model is remarkably successful at
reproducing the positive charge conjugation, C=+, sector of the spectrum. The
only large (and robust) discrepancy involves the 0-+ state. This raises the
interesting possibility that the lattice spin identification is mistaken and
that this state is in fact 4-+. In addition, the Isgur-Paton model does not
incorporate any mechanism for splitting C=+ from C=- (in contrast to the case
in 3+1 dimensions), while the `observed' spectrum shows a substantial
splitting. We explore several modifications of the model in an attempt to
incorporate this physics in a natural way. At the qualitative level we find
that this constrains our choice to a picture in which the C=+/- splitting is
driven by mixing with new states built on closed loops of adjoint flux. However
a detailed numerical comparison suggests that a model incorporating an
additional direct mixing between loops of opposite orientation is likely to
work better; and that, in any case, a non-zero curvature term will be required.
We also point out that a characteristic of any string model of glueballs is
that the SU(N=infinity) mass spectrum will consist of multiple towers of states
that are scaled up copies of each other. To test this will require a lattice
mass spectrum that extends to somewhat larger masses than currently available.


title: Beyond the Standard Model (In Search of Supersymmetry)

abstract:
  The present lectures contain an introduction to low energy supersymmetry, a
new symmetry that relates bosons and fermions, in particle physics. The
Standard Model of fundamental interactions is briefly reviewed, and the
motivation to introduce supersymmetry is discussed. The main notions of
supersymmetry are introduced. The supersymmetric extension of the Standard
Model - the Minimal Supersymmetric Standard Model - is considered in more
detail. Phenomenological features of the MSSM as well as possible experimental
signatures of SUSY are described. An intriguing situation with the
supersymmetric Higgs boson is discussed.


title: Split Fermions in Extra Dimensions and CP Violation

abstract:
  We discuss CP violation in the quark sector within a novel approach to the
Yukawa puzzle proposed by Arkani-Hamed and Schmaltz, where Yukawa hierarchies
result from localising the Standard Model quark field wave-functions, at
different positions (in the extra dimensions) in a ``fat-brane.'' We show that
at least two extra dimensions are necessary in order to obtain sufficient CP
violation while reproducing the correct quark mass spectrum and mixing angles.


title:
Angle Dependence of Polarization Observables by Fragmentation of
  Deuterons to Pions

abstract:
  The fragmentation of deuterons into pions with nonzero angle emitted in the
kinematical region forbidden for free nucleon-nucleon collisions is analyzed.
The inclusive relativistic invariant spectrum of pions and the tensor analyzing
power ${\rm A}_{YY}$ are investigated within the framework of an impulse
approximation using different kinds of the deuteron wave function. The
influence of ${\rm P}$-wave contribution to the deuteron wave function is
studied, too. Our results are compared with the experimental data and other
calculations performed within both the non-relativistic and relativistic
approaches. It was found that theoretical calculations based on IA do not
provide a consistent understanding of the new data in a whole cumulative region
that can be caused by a influence of non-nucleon degrees of freedom.


title:
Creation of large spatial fluctuations in neutrino asymmetry by neutrino
  oscillations

abstract:
  We consider active-sterile neutrino oscillations in the early universe in an
inhomogeneous isocurvature background. We show that very small initial baryonic
seed-inhomogeneities can trigger a growth of very large amplitude spatial
fluctuations in lepton asymmetry. Domains of varying asymmetry are observed to
persist for a long time despite dissipative effects. The space dependent
asymmetry profiles give rise to MSW-resonances within the domain boundaries,
enhancing dramatically the equilibration of the sterile neutrino species.
According to our one-dimensional toy-model, the effect is so strong that almost
the entire parameter space where exponential growth of asymmetry occurs would
be ruled out by nucleosynthesis.


title:
Open and Hidden Charm Production in Heavy Ion Collisions at
  Ultrarelativistic Energies

abstract:
  We consider the production of the open charm and J/psi mesons in heavy ion
collisions at BNL RHIC. We discuss several recently developed pictures for
J/psi production and argue that a measurement at RHIC energies is crucial for
disentangling these different descriptions.


title: Nuclear effects on the spin-dependent structure functions

abstract:
  We address the question how the spin-dependent nucleon structure function
g1(x,Q**2) gets modified when the nucleon is bound inside a nucleus. We analyze
the influence of nuclear interactions using the delta-pion model, known to
describe well the unpolarized effect, and the free polarized parton
distributions. The results for the neutron in 3-He and proton in 3-H, 7-Li and
19-F are presented, showing significant changes in the parton spin
distributions and in their moments. Scattering processes off polarized 7-Li are
suggested which could justify these theoretical calculations and shed more
light on both nuclear spin structure and short distance QCD.


title: Generalized Proper-Time Approach For The Case Of Broken Isospin Symmetry

abstract:
  We present a derivation of the low-energy effective meson Lagrangian of the
Nambu -- Jona-Lasinio (NJL) model on the basis of Schwinger's proper-time
regularization of the one-loop fermion determinant. We consider the case in
which the $SU(2)\times SU(2)$ chiral symmetry of the NJL Lagrangian is broken
by the current quark mass matrix with $\hat{m}_u\ne\hat{m}_d$. The
non-degeneracy of $d$ and $u$ masses destroys one of the most crucial features
of the proper-time expansion -- the chiral-invariant structure of Seeley --
DeWitt coefficients. We show however that systematic resummations inside the
proper-time expansion are still possible and derive a result which is in full
agreement with the chiral Ward -- Takahashi identities.


title: Quark Orbital Angular Momentum in the Baryon

abstract:
  Analytical and numerical results, for the orbital and spin content carried by
different quark flavors in the baryons, are given in the chiral quark model
with symmetry breaking. The reduction of the quark spin, due to the spin
dilution in the chiral splitting processes, is transferred into the orbital
motion of quarks and antiquarks. The orbital angular momentum for each quark
flavor in the proton as a function of the partition factor $\kappa$ and the
chiral splitting probability $a$ is shown. The cancellation between the spin
and orbital contributions in the spin sum rule and in the baryon magnetic
moments is discussed.


title:
Results from Bottomonia Production at the Tevatron and Prospects for the
  LHC

abstract:
  We extend our previous analysis on inclusive heavy quarkonia hadroproduction
to the whole Upsilon(nS) (n=1,2,3) resonance family. We use a Monte Carlo
framework with the colour-octet mechanism implemented in the PYTHIA event
generator. We include in our study higher order QCD effects such as
initial-state emission of gluons and Altarelli-Parisi evolution of final-state
gluons. We extract some NRQCD colour-octet matrix elements relevant for
Upsilon(nS) (n=1,2,3) hadroproduction from CDF data at the Fermilab Tevatron.
Then we extrapolate to LHC energies to predict prompt bottomonia production
rates. Finally, we examine the prospect to probe the gluon density in protons
from heavy quarkonia inclusive hadroproduction at high transverse momentum and
its feasibility in LHC general-purpose experiments.


title: Tau Physics: Theoretical Perspective

abstract:
  The leptonic decays of the tau lepton provide relevant tests on the structure
of the weak currents and the universality of their couplings to the gauge
bosons. The hadronic tau decay modes constitute an ideal tool for studying
low--energy effects of the strong interaction in very clean conditions.
Accurate determinations of the QCD coupling and the strange quark mass have
been obtained with tau decay data. New physics phenomena, such as a non-zero
tau neutrino mass or violations of conservation laws can also be searched for
with tau decays.


title: Preheating, Thermalization and Supergravity

abstract:
  This contribution to the proceedings collects new recent results on
preheating after inflation. We discuss tachyonic preheating in the SUSY
motivated hybrid inflation; development of equilibrium after preheating; theory
of fermionic preheating and the problem of gravitino overproduction from
preheating.


title:
Q^2 evolution of parton distributions at small x. A study of
  higher-twist effects

abstract:
  We investigate the Q^2 evolution of parton distributions at small x values,
obtained in the case of flat initial conditions. The contributions of twist-two
and (renormalon-type) higher-twist operators of the Wilson operator product
expansion are taken into account. The results are in excellent agreement with
deep inelastic scattering experimental data from HERA.


title:
Neutrino Oscillations in Supersymmetry without Lepton number
  conservation and R-parity

abstract:
  With the on-shell renormalization scheme, we discuss neutrino masses up to
one-loop approximation in the Supersymmetry without lepton number conservation
and R-parity. Ii is shown that in this model with experimentally allowed
parameters, $\Delta m^2_{23}, \Delta m^2_{12}$ and the mixing angles
$|\sin\theta{23}|,|\sin\theta_{12}|$ which are consistent with the present
observation values can be produced. We find that small neutrino mass ($\leq$ 1
eV) sets a loose constraint on the R-parity violation parameters in the soft
breaking terms.


title: The Superspace WZNW Action for 4D, N=1 Supersymmetric QCD

abstract:
  We discuss features of the 4D, N = 1 WZNW term expressed as a function of
chiral superfields and defined in a manner appropriate to calculate
phenomenological matrix elements.


title:
Mass determination of the lightest supersymmetric partner (C-boson and
  C-fermion) and cold dark matter

abstract:
  %auto-ignore This paper has been withdrawn by the author(s) because somebody
do not agree with my idea.


title: The scaling of lepton dipole moments with lepton mass

abstract:
  The dipole moments of the leptons and quarks are matrices in flavor space,
which can potentially reveal as much about the flavor structure of the theory
as do the mass matrices. The off-diagonal elements of the dipole matrices lead
to flavor-changing decays such as \mu -> e \gamma, while the imaginary parts of
the diagonal elements give rise to electric dipole moments. We analyze the
scaling of the leptonic dipole moments with the lepton masses in theories
beyond the standard model. While in many models the dipole moments scale
roughly as lepton mass, it is shown that simple models exist in which the
dipoles scale as the cube of the mass or in other ways. An explicit example
with cubic scaling is presented, which is motivated on independent grounds from
large angle neutrino oscillation data. Our results have great significance for
the observability of the electric dipole moments of e, \mu and \tau, and the
rare decays \mu -> e \gamma, and \tau -> \mu \gamma and will be tested in
several forthcoming experiments.


title:
A local Langevin equation for slow long-distance modes of hot
  non-Abelian gauge fields

abstract:
  The effective theory for the dynamics of hot non-Abelian gauge fields with
spatial momenta of order of the magnetic screening scale g^2 T is described by
a Boltzmann equation. The dynamical content of this theory is explored. There
are three relevant frequency scales, g T, g^2 T and g^4 T, associated with
plasmon oscillations, multipole fluctuations of color charge, and with the
non-perturbative gauge field dynamics, respectively. The frequency scale g T is
integrated out. The result is a local Langevin-type equation. It is valid to
leading order in g and to all orders in log(1/g), and it does not suffer from
the hard thermal loop divergences of classical thermal Yang-Mills theory. We
then derive the corresponding Fokker-Planck equation, which is shown to
generate an equilibrium distribution corresponding to 3-dimensional Yang-Mills
theory plus a Gaussian free field.


title: Top flavour-changing neutral coupling signals at a linear collider

abstract:
  We present an analysis of the sensitivity of the TESLA e+ e- collider to top
flavour-changing neutral couplings to the Z boson and photon. We consider the
cases without beam polarization, with only e- polarization and with e- and e+
polarization, showing that the use of the latter substantially enhances the
sensitivity to discover or bound these vertices. For some of the couplings the
expected LHC limits could be improved up to an order of magnitude for equal
running times.


title: Three generations on a local vortex in extra dimensions

abstract:
  We develop an approach to the origin of three generations of the Standard
Model fermions from one generation in a higher-dimensional theory, where
four-dimensional fermions appear as zero modes trapped in the core of a
topological defect, and the hierarchy of masses and mixings is produced by wave
function overlaps in extra dimensions. We present a model with unbroken U(1)
symmetry where three zero modes appear on an Abrikosov-Nielsen-Olesen vortex
due to nontrivial scalar--fermion interactions.


title:
On the $\sigma_L/\sigma_T$ Ratio in Polarized Vector Meson
  Photoproduction

abstract:
  We study the spin-dependent cross-sections of vector meson photoproduction
for longitudinally and transversely polarized photons within a QCD- model. The
dependence of the $\sigma_T/\sigma_L$ ratio on the photon virtuality and on the
meson wave function is analysed.


title:
2000 CKM-Triangle Analysis A Critical Review with Updated Experimental
  Inputs and Theoretical Parameters

abstract:
  Within the Standard Model, a review of the current determination of the sides
and angles of the CKM unitarity triangle is presented, using experimental
constraints from the measurements of |\epsilon_K|, |V_{ub}/V_{cb}|, \Delta m_d
and from the limit on \Delta m_s, available in September 2000. Results from the
experimental search for {B}^0_s-\bar{B}^0_s oscillations are introduced in the
present analysis using the likelihood. Special attention is devoted to the
determination of the theoretical uncertainties. The purpose of the analysis is
to infer regions where the parameters of interest lie with given probabilities.
The BaBar "95 %, C.L. scanning" method is also commented.


title:
B-physics constraints on baryon number violating couplings: grand
  unification or R-parity violation

abstract:
  We investigate the role that baryon number violating interactions may play in
$B$ phenomenology. Present in various grand unified theories, supersymmetric
theories with R-parity violation and composite models, a diquark state could be
quite light. Using the data on B decays as well as $B - {\bar B}$ mixing, we
find strong constraints on the couplings that such a light diquark state may
have with the Standard Model quarks.


title: Diffractive vector boson production at the Tevatron

abstract:
  The diffractive production of vector bosons at the Tevatron is studied. We
take a hard pomeron flux and use the H1 parton density functions extracted from
their measurement of F_2^{D(3)}. To this we add a reggeon exchange
contribution. We find that the ratio of diffractive to non-diffractive W boson
production is in good agreement with the CDF data. We note that the poorly
understood reggeon contribution might be as large as the pomeron contribution
in the kinematic range of the data. We also note that our pomeron exchange
contribution is much smaller than earlier predictions due to our use of a hard
pomeron flux. All our results have been obtained using the lowest order matrix
elements and we have compared to the results obtained using a modified version
of Herwig which is capable of generating a wide variety of diffractive
scattering processes. Gap survival is estimated using Pythia and is found to be
around 60%. We make predictions which could be compared to future measurements
of diffractive Drell-Yan production.


title: Higgs description of two-flavor QCD vacuum

abstract:
  A Higgs description for the QCD vacuum in the limit of two quark flavors is
proposed. Complete ``spontaneous breaking'' of color symmetry is realized by
condensation of an adjoint quark-antiquark and a quark-quark pair. The vacuum
is invariant under isospin symmetry applying color and flavor transformations
simultaneously. All elementary excitations acquire integral charges. The
dressed microscopic quark and gluon degrees of freedom can be identified with
the macroscopic baryon and vector meson degrees of freedom. In addition to the
nucleons we find soliton--type fermions with integer isospin. Their presence
provides an important test accessible to lattice QCD simulations.


title: Neutrinos

abstract:
  In these lectures the following topics are considered: historical remarks and
general properties, Dirac and Majorana neutrino masses, effective lagrangian
approach, the seesaw mechanism, the number of active left-hauded neutrino
species, the light neutrino mass matrix, the direct measurement of neutrino
masses, double beta decay, neutrino oscillations in vacuum and neutrino
oscillations in matter.


title:
Zenith angle distributions at Super-Kamiokande and SNO and the solution
  of the solar neutrino problem

abstract:
  We have performed a detailed study of the zenith angle dependence of the
regeneration factor and distributions of events at SNO and SK for different
solutions of the solar neutrino problem. In particular, we discuss oscillatory
behaviour and the synchronization effect in the distribution for the LMA
solution, the parametric peak for the LOW solution, etc.. Physical
interpretation of the effects is given. We suggest a new binning of events
which emphasizes distinctive features of zenith angle distributions for the
different solutions. We also find the correlations between the integrated
day-night asymmetry and the rates of events in different zenith angle bins.
Study of these correlations strengthens the identification power of the
analysis.


title: Radiative Transitions in Heavy Mesons in a Relativistic Quark Model

abstract:
  The radiative decays of $D^*$, $B^*$, and other excited heavy mesons are
analyzed in a relativistic quark model for the light degrees of freedom and in
the limit of heavy quark spin-flavor symmetry. The analysis of strong decays
carried out in the corresponding chiral quark model is used to calculate the
strong decays and determine the branching ratios of the radiative $D^*$ decays.
Consistency with the observed branching ratios requires the inclusion of the
heavy quark component of the electromagnetic current and the introduction of an
anomalous magnetic moment for the light quark. It is observed that not only
$D$, but also $B$ meson transitions within a heavy quark spin multiplet are
affected by the presence of the heavy quark current.


title: WIMP Annual Modulation with Opposite Phase in Late-Infall Halo Models

abstract:
  We show that in the late-infall model of our galactic halo by P. Sikivie the
expected phase of the annual modulation of a WIMP halo signal in direct
detection experiments is opposite to the one usually expected. If a
non-virialized halo component due to the infall of (collisionless) dark matter
particles cannot be rejected, an annual modulation in a dark matter signal
should be looked for by experimenters without fixing the phase a-priori.
Moreover, WIMP streams coming to Earth from directions above and below the
galactic plane should be expected, with a characteristic pattern of arrival
directions.


title: On Radiative Weak Annihilation Decays

abstract:
  We discuss a little-studied class of weak decay modes sensitive to only one
quark topology at leading order in G_F: M --> m gamma, where M,m are mesons
with completely distinct flavor quantum numbers. Specifically, they proceed via
the annihilation of the valence quarks through a W and the emission of a single
hard photon, and thus provide a clear separation between CKM and strong
interaction physics. We survey relevant calculations performed to date, discuss
experimental discovery potential, and indicate interesting future directions.


title: Standard Model Neutrinos as Warm Dark Matter

abstract:
  Standard Model neutrinos are not usually considered plausible dark matter
candidates because the usual treatment of their decoupling in the early
universe implies that their mass must be sufficiently small to make them
``hot'' dark matter. In this paper we show that decoupling of Standard Model
neutrinos in low reheat models may result in neutrino densities very much less
than usually assumed, and thus their mass may be in the keV range. Standard
Model neutrinos may therefore be warm dark matter candidates.


title:
Spontaneous CP Violation in the Next-to-Minimal Supersymmetric Standard
  Model Revisited

abstract:
  We re-examine spontaneous CP violation at the tree level in the context of
the next-to-minimal supersymmetric standard model (NMSSM) with two Higgs
doublets and a gauge singlet field. We analyse the most general Higgs potential
without a discrete Z_3 symmetry, and derive an upper bound on the mass of the
lightest neutral Higgs boson consistent with present experimental data. We
investigate, in particular, its dependence on the admixture and CP-violating
phase of the gauge singlet field, as well as on tan(beta). To assess the
viability of the spontaneous CP violation scenario, we estimate epsilon_K by
applying the mass insertion approximation. We find that a non-trivial flavour
structure in the soft-breaking A terms is required to account for the observed
CP violation in the neutral kaon sector. Furthermore, combining the
minimisation conditions for spontaneous CP violation with the constraints
coming from K0-K0bar mixing, we find that the upper bound on the lightest
Higgs-boson mass becomes stronger. We also point out that the electric dipole
moments of electron and neutron are a serious challenge for SUSY models with
spontaneous CP violation.


title: HERWIG for Top Physics at the Linear Collider

abstract:
  We discuss recent improvement in the treatment of gluon radiation in top
production and decay in e+e- processes according to the HERWIG event generator
and show studies on the top mass reconstruction at the future Linear Collider.


title:
Supersymmetric structure of spacetime and matter -superon-graviton
  model-

abstract:
  A unified description of spacetime and matter is proposed by using a single
irreducible representation of SO(10) Super-Poincare algebra(SO(10)SPA). All
(observed) elementary particles except the graviton are the (massless)
eigenstates of SO10)SPA composed of fundamental Nambu-Goldstone fermions with
spin 1/2, superons, associating with the spontaneous breakdown of the
supertranslation of the spacetime. The systematic investigations of the
standard model(SM) and SU(5)GUT by using superon diagrams may reveal the
generation structure, the stability of the proton, K-, B-, D- mixings,
CP-violation, the atmospheric and solar neutrino deficits and the absence of
the electroweak lepton-flavor-mixing. The fundamental action of the
superon-graviton model(SGM) for spacetime and matter is proposed, which is
invariant under a new supersymmetry.


title: Neutrino mass due to the mixing among neutrinos and gauginos

abstract:
  We consider the explanation of both data of the atmospheric neutrino and the
solar neutrino by the neutrino mass matrix derived from the mixing of neutrinos
and gauginos in the extended MSSM with an extra U(1) gauge symmetry. This
scenario directly relates the neutrino mass to supersymmetry. The structure of
the mass hierarchy and the mixing is determined only by the extra U(1)-charge
of neutrinos. Although the model is rather simple, it may be able to realize
both the small and large mixing angle solutions for the solar neutrino problem.
In particular, the large mixing angle MSW solution for the solar neutrino
problem can be easily realized. We discuss the relation between the extra
U(1)-charge and four solutions for the solar neutrino problem.


title:
Optimized Perturbation Theory at Finite Temperature--- Two-Loop
  Analysis---

abstract:
  We study the optimized perturbation theory (OPT) at finite temperature, which
is a self-consistent resummation method. Firstly, we generalize the idea of the
OPT to optimize the coupling constant in lambda phi^4 theory, and give a proof
of the renormalizability of this generalized OPT. Secondly, the principle of
minimal sensitivity and the criterion of the fastest apparent convergence,
which are conditions to determine the optimal parameter values, are examined in
lambda phi^4 theory. Both conditions exhibit a second-order transition at
finite temperature with critical exponent beta = 0.5 in the two-loop
approximation.


title:
S-matrix Bases and Relation between pi pi Scattering and Production
  Amplitudes

abstract:
  It is stated that the requirement of unitarity and of analyticity should be
made on the S-matrix elements with right bases, and the ``universality
argument" made with the bases, which do not regard quark physical picture, is
not right. Accordingly the result of the conventional analyses of the pi pi
production amplitudes following to this argument, leading to non-existence of
the light sigma-meson, is proved to lose its theoretical bases.


title: sigma and kappa in Scattering Processes and New pi0 pi0 Phase Shift Data

abstract:
  The evidences for sigma(600) and kappa(900) observed in our analyses on the
pi pi and K pi scattering phase shift data are described, briefly. The analysis
have been performed by the interfering amplitude method, which satisfies the
unitarity requirement, using physically meaningful parameters. The introduction
of the negative phase shifts (repulsive force) are essential in the analysis.
New data for the pi0 pi0 scattering amplitudes and the I=0 S wave phase shifts
are presented. The data have been obtained in the pi-p charge exchange
reaction, pi- p --> pi0 pi0 n at 9 GeV by the E135 experiment at the KEK PS.
The amplitude analysis are performed. The behavior of the I=0 S wave phase
shifts below KKbar threshold are consistent with those of the pi+ pi-, so
called, standard data and those of the down-flat solution of the
CERN-Cracow-Munich polarization data. The analysis of the pi0 pi0 phase shift
data observes sigma(600) with the B-W parameters, M_sigma =588 +- 12 MeV and
Gamma_sigma =281 +- 25 MeV, which are in good agreement with those in our
analysis on the pi+ pi- data.


title: Observed Property of sigma-Meson and Chiral Symmetry

abstract:
  The phenomenologically observed property of sigma(600) in our recent analyses
of various pi pi-scattering and -production processes is reviewed and compared
with the prediction of SU(2) linear sigma model. Furthermore, a possibility of
the scalar sigma-nonet (sigma (600), kappa (900), f_0(980) and a_0(980))
forming with the pseudoscalar pi-nonet a linear representation of SU(3) chiral
symmetry is investigated. The origin of repulsive background phase shift
delta_BG, which is essential to lead us to the sigma-existence in our phase
shift analysis, is shown to come from the repulsive lambda phi^4 interaction.


title: Production of 3pi0 and eta 2pi0 from pi-p Collision in GAMS Experiment

abstract:
  The data on the pi- p --> M0 n, with M0 = pi0 pi0 pi0 or pi0 pi0 eta obtained
in the GAMS experiment may be useful to study the sigma(400--700) and a_1^chi
(1000), which can be taken as chiral partners of pi and rho, respectively. A
preliminary analysis for 3pi0 invariant mass spectra gives a support for the
assumed a_1^chi with a mass of 930 MeV and Gamma = 170 MeV.


title:
Light sigma-Meson Production in Excited Upsilon Decay Processes I:
  Analyses

abstract:
  We analyze the pi pi production amplitudes in the excited Upsilon decay
processes, Upsilon(2S)-->Upsilon(1S)pi+pi-, Upsilon(3S)-->Upsilon(1S)pi+pi- and
Upsilon(3S)-->Upsilon(2S)pi+pi-, and the pi pi and KKbar production amplitudes
in the charmonium decay processes, psi(2S)-->J psi pi+pi- and J psi-->phi
pi+pi-, phi K+K-. The amplitudes are parametrized by the sum of Breit-Wigner
amplitudes for the sigma and the other relevant particles and of the direct
2pi-production amplitude, following the VMW method. All the pi pi (and KKbar)
invariant mass spectra are reproduced well with the sigma Breit-Wigner
amplitude by using the common parameters, m_sigma=526^(+48)_(-37) MeV and
Gamma_sigma =301^(+145)_(-100) MeV, which is almost consistent with the values
obtained in our previous phase shift analyses. This strongly suggests the
existence of light sigma-meson.


title:
Light sigma-Meson Production in Excited Upsilon Decay Processes II:
  Theoretical Investigation

abstract:
  The results of analyses obtained in Part I are examined from the viewpoint of
chiral symmetry. The mass spectra of pi pi system are widely believed to be
suppressed generally near the threshold, because of the derivative coupling
property of Nambu-Goldstone pi meson. However, this suppression does not hold
in the processes with large energy release, and the steep increase from the pi
pi threshold observed in the transition Upsilon (3S-->1S) is shown to be
consistent with general constraints from chiral symmetry.


title: Covariant Level-Classification Scheme and Chiral Symmetry

abstract:
  Starting from the bi-local Klein-Gordon Equation with spin-independent
squared-mass operator, we give a covariant quark representation of general
composite meson systems with definite Lorentz transformation properties. For
benefit of this representation we are able to deduce automatically the
transformation rules of composite mesons for general symmetry operations from
those of constituent (exciton) quarks. Applying this we investigate especially
physical implication of chiral symmetry for the meson systems, and present a
covariant level-classification scheme, leading to a possible existence of new
meson multiplets of "chiralons."


title: Solving the nucleon spin puzzle based on the chiral quark soliton model

abstract:
  An incomparable feature of the chiral quark soliton model as compared with
many other effective models like the MIT bag model is that it can give
reasonable predictions not only for quark distributions but also for antiquark
distributions. This will be exemplified by the argument on the positivity
constraint for $\bar{u} (x) + \bar{d} (x)$ as well as the Soffer inequality for
quark and antiquark distributions. We also explain how the model can resolve
the so-called nucleon spin puzzle without assuming large gluon polarization at
the low energy scale.


title: Chiral-odd distribution functions in the chiral quark soliton model

abstract:
  The recent measurements of azimuthal single spin asymmetries by the HERMES
collaboration has opened up new possibility to measure chiral-odd distribution
functions through semi-inclusive deep-inelastic scatterings. Here, predictions
are given for the twist-2 and twist-3 chiral-odd distribution functions of the
nucleon within the framework of the chiral quark soliton model, with full
inclusion of the vacuum polarization effects as well as the subleading $1/N_c$
corrections. The importance of the vacuum polarization effects is demonstrated
by showing that the so-called Soffer inequality holds not only for the quark
distributions but also for the antiquark ones.


title:
Production and decay of the neutral top-pion in high energy $e^{+}e^{-}$
  colliders

abstract:
  We study the production and decay of the neutral top-pion $\pi_{t}^{0}$
predicted by topcolor-assisted technicolor(TC2) theory. Our results show that,
except the dominant decay modes $b\bar{b}$, $\bar{t}c$ and $gg$, the
$\pi_{t}^{0}$ can also decay into $\gamma\gamma$ and $Z \gamma$ modes. It can
be significantly produced at high energy $e^{+}e^{-}$ collider(LC) experiments
via the processes $e^{+}e^{-}\to \pi_{t}^{0}\gamma$ and $e^{+}e^{-}\to
Z\pi_{t}^{0}$. We further calculate the production cross sections of the
processes $e^{+}e^{-}\to\gamma\pi_{t}^{0}\to\gamma\bar{t}c$ and $e^{+}e^{-}\to
Z\pi_{t}^{0}\to Z\bar{t}c$. We find that the signatures of the neutral top-pion
$\pi_{t}^{0}$ can be detected via these processes.


title:
Neutrino Masses and Lepton-Flavor Violation in Supersymmetric Models
  with lopsided Froggatt-Nielsen charges

abstract:
  We analyze in detail lepton-flavor violation (LFV) in the charged-lepton
sector such as $\mu \to e \gamma$, $\tau \to \mu \gamma$, $\mu \to eee$ and the
$\mu \to e$ conversion in nuclei, within the framework of supersymmetric models
with lopsided Froggatt--Nielsen charges, in which the large mixing in the
neutrino sector as well as small mixings in the quark sector can be naturally
accommodated. We show that the present experimental limits on the LFV processes
already exclude some of the models. The future proposed search for LFV,
especially in muon processes, can provide a significant probe to this
framework. We also stress the importance of the measurement of $U^{MNS}_{e3}$
in neutrino experiments, and the fact that the KamLAND experiment could play a
significant role to test a certain class of models.


title:
Excitations of Rotational States in String Model of Meson and in
  Three-string Baryon Model

abstract:
  For the relativistic string with massive ends, the three-string baryon model
and other string models of the baryon the small disturbances of well known
rotational motions are considered. For the string meson model the two types of
these disturbances (quasirotational motions) are obtained. They are oscillatory
motions in the form of stationary waves in the rotational plane and in the
orthogonal direction. These solutions may be used for describing more wide
spectrum of hadron excitations and for the quantization of this nonlinear
system. For three-string baryon model or Y configuration these quasirotational
motions are more complicated and contain the branch with growing amplitudes.
This consideration proves that for the three-string model with both massless
and massive ends the rotational motions are unstable on the classical level.


title: Decay rate asymmetry for $B \to X_s \gamma$ in SUSY model

abstract:
  We discuss a rate asymmetry for the radiative $B$-meson decay $B \to X_s
\gamma$ within the framework of the supersymmetric standard model based on N=1
supergravity. This model contains new sources of CP violation. In spite of
severe experimental constraints on the electric dipole moment of the neutron, a
new CP-violating phase may not be suppressed, leading to a sizable enhancement
of the decay rate asymmetry. The magnitude of the asymmetry is predicted to be
larger than that by the standard model in wide parameter regions where the
branching ratio is consistent with its experimental bounds. A possible maximal
magnitude is about 0.1, which will be well accessible at B factories.


title: A Few Aspects of Heavy Quark Expansion

abstract:
  Two topics in heavy quark expansion are discussed. The heavy quark potential
in perturbation theory is reviewed in connection to the problem of the heavy
quark mass. The nontrivial reason behind the failure of the "potential
subtracted" mass in higher orders is elucidated. The heavy quark sum rules are
the second subject. The physics behind the new exact sum rules is described and
a simple quantum mechanical derivation is given. The question of saturation of
sum rules is discussed. A comment on the nonstandard possibility which would
affect analysis of BR_sl(B) vs. n_c is made.


title:
Electron and Neutron Electric Dipole Moments in the Focus Point Scenario
  of SUGRA Model

abstract:
  We estimate the electron and neutron electric dipole moments in the focus
point scenario of the minimal SUGRA model corresponding to large sfermion
masses and moderate to large $\tan\beta$. There is a viable region of moderate
fine-tuning in the parameter space, around $\tan\beta \simeq 5$, where the
experimental limits on these electric dipole moments can be satisfied without
assuming unnaturally small phase angles. But the fine-tuning constraints become
more severe for $\tan\beta > 10$.


title: Nonlinear effects in Compton scattering at photon colliders

abstract:
  The backward Compton scattering is a basic process at future higher energy
photon colliders. To obtain a high probability of e->gamma conversion the
density of laser photons in the conversion region should be so high that
simultaneous interaction of one electron with several laser photons is possible
(nonlinear Compton effect). In this paper a detailed consideration of energy
spectra, helicities of final photons and electrons in nonlinear backward
Compton scattering of circularly polarized laser photons is given.
Distributions of gamma-gamma luminosities with total helicities 0 and 2 are
investigated. Very high intensity of laser wave leads to broadening of the
energy (luminosity) spectra and shift to lower energies (invariant masses).
Beside complicated exact formulae, approximate formulae for energy spectrum and
polarization of backscattered photons are given for relatively small nonlinear
parameter xi^2 (first order correction). All this is necessary for optimization
of the conversion region at photon colliders and study of physics processes
where a sharp edge of the luminosity spectrum and monochromaticity of
collisions are important.


title: Photoabsorption sum rules and quark structure parameters of hadrons

abstract:
  Following the idea of the quark-hadron duality we present, within the
constituent quark model approach, the relations between different
bremsstrahlung-weihgted integrals of the nucleon resonance photoexcitation
cross sections and correlation functions of the quark dipole moments in the
nucleon ground state. These functions are of interest for checking detailed
quark-configuration structure of the nucleon state vector. Some applications of
this approach in meson sector are made and the role of meson degrees of freedom
in the electromagnetic baryon observables is briefly discussed.


title: Radiative Corrections to Chargino Production with Polarized Beams

abstract:
  We show that radiative corrections to chargino production in
electron-positron annihilation with polarized beams can be large especially in
the case of right handed electrons. In addition, there is some dependency on
the squark masses that allows us to extract information about the squark
spectrum from the chargino production.


title: Polarized structure functions of the deuteron

abstract:
  Physics of spin-1 hadron is an unexplored topic in the high-energy region
although spin-1/2 physics has been well investigated in the last decade. It is
important to test our knowledge of hadron spin structure in a quite different
field of spin physics. We discuss tensor structure functions, which do not
exist for the spin-1/2 nucleon, in lepton scattering and in hadron reactions
such as the polarized proton-deuteron Drell-Yan process.


title: Can Subquark Model explain CP violation ?

abstract:
  We study CP violation phenomena with the subquark model which is previously
proposed by us. Our subquark model claims that ``direct'' and ``indirect'' CP
violation originate from different sources, which are both belonging to
subquark dynamics. We discuss KTeV experiment and CP-asymmetry of
$(B_{d}\to{J/{\psi}K_{s}})$-and $(B_{d}\to{\pi}{\pi})$-decay.
  This model predicts : the phases of indirect CP violation :
  ${\theta}_K={\theta}_D={\theta}_{B_s}={\theta}_{T_c}\simeq(1/2){\theta}_{B_d}
  \simeq (1/2){\theta}_{T_u}$.


title:
Scalar partner of $Z^0$-boson with larger mass value than $Z^0$-boson
  mass in Subquark model

abstract:
  The subquark model previously proposed by us showes that the intermediate
$Z^0$-boson is realized as the composite object and its scalar partner has the
mass value larger than $Z^0$-boson mass, which is about 110 GeV.


title:
Evaluation of Self-Intersecting Wilson Loop in the Stochastic Vacuum
  Model

abstract:
  A Wilson loop is evaluated within the stochastic vacuum model for the case
when the respective contour is self-intersecting and its size does not exceed
the correlation length of the vacuum. The result has the form of a certain
functional of the tensor area. It is similar to that for the
non-self-intersecting loop only when the contour is a plane one. Even for such
a contour, the obtained expression depends on the ratio of two functions
parametrizing the bilocal field strength correlator taken at the origin, which
is not so for the case of non-self-intersecting contour.


title: CP Violation in Seesaw Model

abstract:
  We study the structure of CP violating phases in the seesaw model. We find
that the $3\times 6$ MNS matrix contains six independent phases, three of which
are identified as a Dirac phase and two Majorana phases in the light neutrino
sector while the remaining three arise from the mixing of the light neutrinos
and heavy neutrinos. We show how to determine these phases from physical
observables.


title:
Thermalization in a Hartree Ensemble Approximation to Quantum Field
  dynamics

abstract:
  For homogeneous initial conditions, Hartree (gaussian) dynamical
approximations are known to have problems with thermalization, because of
insufficient scattering. We attempt to improve on this by writing an arbitrary
density matrix as a superposition of gaussian pure states and applying the
Hartree approximation to each member of such an ensemble. Particles can then
scatter via their back-reaction on the typically inhomogeneous mean fields.
Starting from initial states which are far from equilibrium we numerically
compute the time evolution of particle distribution functions and observe that
they indeed display approximate thermalization on intermediate time scales by
approaching a Bose-Einstein form. However, for very large times the
distributions drift towards classical-like equipartition.


title:
Markov-Yukawa Transversality Principle And 3D-4D Interlinkage Of
  Bethe-Salpeter Amplitudes

abstract:
  This article is designed to focus attention on the Markov-Yukawa
Transversality Principle (MYTP) as a novel paradigm for an exact 3D-4D
interlinkage between the corresponding BSE amplitudes, with a closely parallel
treatment of $q{\bar q}$ and $qqq$ systems, stemming from a common 4-fermion
Lagrangian mediated by gluon (vector)-like exchange. This unique feature of
MYTP owes its origin to a Lorentz- covariant 3D support to the BS kernel, which
acts as a sort of `gauge principle' and distinguishes it from most other 3D
approaches to strong interaction dynamics. Some of the principal approaches in
the latter category are briefly reviewed so as to set the (less familiar) MYTP
in their context. Two specific types of MYTP which provide 3D support to the
BSE kernel, are considered: a) Covariant Instantaneity Ansatz (CIA); b)
Covariant LF/NP ansatz (Cov.LF). Both lead to formaly identical 3D BSE
reductions but produce sharply different 4D structures: Under CIA, the 4D loop
integrals suffer from Lorentz mismatch of the vertex functions, leading to
ill-defined time-like momentum integrals, but Cov LF is free from this disease.
This is illustrated by the pion form factor under Cov LF. The reconstruction of
the 4D $qqq$ wave function is achieved by Green's function techniques. PACS:
11.10 st ; 12.38 Lg ; 13.40.Fn. Keywords: Tamm-Dancoff, Bethe-Salpeter,
Quasi-potentials, Light-front (LF), Markov-Yukawa, 3D-4D Interlinkage, CIA,
Cov-LF, Spectroscopy.


title:
Role of the nonperturbative input in QCD resummed Drell-Yan
  $Q_T$-distributions

abstract:
  We analyze the role of the nonperturbative input in the Collins, Soper, and
Sterman (CSS)'s $b$-space QCD resummation formalism for Drell-Yan transverse
momentum ($Q_T$) distributions, and investigate the predictive power of the CSS
formalism. We find that the predictive power of the CSS formalism has a strong
dependence on the collision energy $\sqrt{S}$ in addition to its well-known
$Q^2$ dependence, and the $\sqrt{S}$ dependence improves the predictive power
at collider energies. We show that a reliable extrapolation from perturbatively
resummed $b$-space distributions to the nonperturbative large $b$ region is
necessary to ensure the correct $Q_T$ distributions. By adding power
corrections to the renormalization group equations in the CSS formalism, we
derive a new extrapolation formalism. We demonstrate that at collider energies,
the CSS resummation formalism plus our extrapolation has an excellent
predictive power for $W$ and $Z$ production at all transverse momenta $Q_T\le
Q$. We also show that the $b$-space resummed $Q_T$ distributions provide a good
description of Drell-Yan data at fixed target energies.


title:
Three-body forces, single diffraction dissociation and shadow
  corrections to hadron-deuteron total cross-sections

abstract:
  The relationships between the fundamental dynamics and diffraction phenomena
in scattering from two-body composite system are discussed. A new simple
formula for the shadow corrections to the total cross-section in scattering
from deuteron has been derived and new scaling characteristics with a clear
physical interpretation have been established. The effect of weakening the
inelastic screening at super-high energies is theoretically discovered. A
comparison with the experimental data on proton(antiproton)-deuteron total
cross-sections has been performed. It is shown that there is quite a remarkable
correspondence of the theory with the experimental data.


title: Propagation of Muons and Taus at High Energies

abstract:
  The photonuclear contribution to charged lepton energy loss has been
re-evaluated taking into account HERA results on real and virtual photon
interactions with nucleons. With large $Q^2$ processes incorporated, the
average muon range in rock for muon energies of $10^9$ GeV is reduced by only
5% as compared with the standard treatment. We have calculated the tau energy
loss for energies up to $10^9$ GeV taking into consideration the decay of the
tau. A Monte Carlo evaluation of tau survival probability and range show that
at energies below $10^7-10^8$ GeV, depending on the material, only tau decays
are important. At higher energies the tau energy losses are significant,
reducing the survival probability of the tau. We show that the average range
for tau is shorter than its decay length and reduce to 17 km in water for an
incident tau energy of $10^9$ GeV, as compared with its decay length of 49 km
at that energy. In iron, the average tau range is 4.7 km for the same incident
energy.


title: H-->WW as the discovery mode for a light Higgs boson

abstract:
  The production cross section for a m_H=115 GeV, SM Higgs boson in weak boson
fusion at the LHC is sizable. However, the branching fraction for H-->WW is
expected to be relatively small. The signal, with its two forward jets, is
sufficiently different from the main backgrounds that a signal to background
ratio of better than 1:1 can nevertheless be obtained, with large enough rate
to allow for a 5 sigma signal with 35 fb^{-1} of data. The H-->WW signal in
weak boson fusion may thus prove to be the discovery mode for the Higgs boson
at the LHC.


title: Split Multiplets, Coupling Unification and Extra Dimension

abstract:
  We study a gauge coupling unification scenario based on a non-supersymmetric
5-dimensional model. Through an orbifold compactification, we obtain the
Standard Model with split multiplets on a 4-dimensional wall, which is
compatible with a grand unification.


title:
Unitarity constraints on scalar parameters of the Standard and Two Higgs
  Doublets Model

abstract:
  Unitarity constraints on the scalar parameters both for the Standard Model
and the general Two Higgs Doublet Model (THDM) are examined. In the case of the
THDM with an exact discrete symmetry transformation, we show that the mass of
the lightest CP-even Higgs boson ($M_h$) and $\tan\beta$ are strongly
correlated and consequently a strong lower bound can be put on $M_h$ for large
$\tan\beta$. It is also shown that the inclusion of the discrete symmetry
breaking term relaxes the aforementioned correlation.


title: The Earth effects on the supernova neutrino spectra

abstract:
  The Earth effects on the energy spectra of supernova neutrinos are studied.
We analyze numerically the time-integrated energy spectra of neutrino in a
mantle-core-mantle step function model of the Earth's matter density profile.
We consider a realistic frame-work in which there are three active neutrinos
whose mass squared differences and mixings are constrained by the present
understanding of solar and atmospheric neutrinos. We find that the energy
spectra change for some allowed mixing parameters. Especially, the expected
number of events at SNO shows characteristic behavior with respect to energy,
i.e. a great dip and peak. We show that observations of the Earth effect allow
us to identify the solar neutrino solution and to probe the mixing angle
$\theta_{2}$.


title: Polarized strangeness in the nucleon

abstract:
  A large violation of the Okubo-Zweig-Iizuka rule was discovered in the
annihilation of stopped antiprotons. The explanation of these experimental data
is discussed in the framework of the model assumed that the nucleon strange sea
quarks are polarized.


abstract:
  We discuss the implementations of the Bose-Einstein effect from asymmetric
sources in Monte Carlo generators. A comparison of LEP data with results from
the PYTHIA/JETSET code with the standard procedure imitating the effect and
with the results from the weight method
  (with weights depending in various ways on components of momenta differences)
is presented. We show that in this last method one can reproduce the
experimental hierarchy of the source radii.


title:
MNS Parameters from Neutrino Oscillations, Single Beta Decay and Double
  Beta Decay

abstract:
  We examine the constraints on the MNS lepton mixing matrix =66rom the present
and future experimental data of the neutrino oscillation, tritium beta decay,
and neutrinoless double beta decay for Majorana neutrinos. We show that the
small mixing angle solutions for solar neutrino problem are disfavored for
small averaged mass ($<m_\nu>$) of neutrinoless double beta decay ($\leq 0.01$
eV) in the inverse neutrino mass hierarchy scenario. This is the case even in
the normal mass hierarchy scenario except for very restrictive value of the
averaged neutrino mass ($\bar{m_\nu}$) of single beta decay. The lower mass
bound for $\bar{m_\nu}$ is given from the present neutrino oscillation data. We
obtain some relations between $<m_\nu>$ and $\bar{m_\nu}$. The constraints on
the Majorana CP violating phases are also given.


title: Abelian Monopole and Center Vortex Views at the Multi-Instanton Gas

abstract:
  We consider full non-Abelian, Abelian and center projected lattice field
configurations built up from random instanton gas configurations in the
continuum. We study the instanton contribution to the $\bar{Q}Q$ force with
respect to ({\it i}) instanton density dependence, ({\it ii}) Casimir scaling
and ({\it iii}) whether various versions of Abelian dominance hold. We check
that the dilute gas formulation for the interaction potential gives an reliable
approximation only for densities small compared to the phenomenological value.
We find that Casimir scaling does not hold, confirming earlier statements in
the literature. We show that the lattice used to discretize the instanton gas
configurations has to be sufficiently coarse ($a \approx 2\bar{\rho}$ compared
with the instanton size $\bar{\rho}$) such that maximal Abelian gauge
projection and center projection as well as the monopole gas contribution to
the $\bar{Q}Q$ force reproduce the non-Abelian instanton-mediated force in the
intermediate range of linear quasi-confinement. We demonstrate that monopole
clustering also depends critically on the discretization scale confirming
earlier findings based on monopole blocking.


title: Low Energy Pion-Hyperon Interaction

abstract:
  We study the low energy pion-hyperon interaction considering effective
non-linear chiral invariant Lagrangians including pions, rho mesons, hyperons
and corresponding resonances. Then we calculate the S- and P-wave phase-shifts,
total cross sections, angular distributions and polarizations for the momentum
in the center-of-mass frame up to k=400 MeV. With these results we discuss the
CP violation in the csi-> pi-lambda and omega-> pi-csi weak decays.


title:
On the Energy Loss of High Energy Quarks in a Finite-Size Quark-Gluon
  Plasma

abstract:
  We study within the light-cone path integral approach the induced gluon
emission from a fast quark passing through a finite-size QCD plasma. We show
that the leading log approximation used in previous studies fails when the
gluon formation length becomes of the order of the length of the medium
traversed by the quark. Calculation of the energy loss beyond the leading log
approximation gives the energy loss which grows logarithmically with quark
energy contrary to the energy independent prediction of the leading log
approximation.


title: Axion Radiation from Strings

abstract:
  This paper revisits the problem of the string decay contribution to the axion
cosmological energy density. We show that this contribution is proportional to
the average relative increase when axion strings decay of a certain quantity
$N_{\rm ax}$ which we define. We carry out numerical simulations of the
evolution and decay of circular and non-circular string loops, of bent strings
with ends held fixed, and of vortex-antivortex pairs in two dimensions. In the
case of string loops and of vortex-antivortex pairs, $N_{\rm ax}$ decreases by
approximately 20%. In the case of bent strings, $N_{\rm ax}$ remains constant
or increases slightly. Our results imply that the string decay contribution to
the axion energy density is of the same order of magnitude as the
well-understood contribution from vacuum realignment.


title: Staying Thermal with Hartree Ensemble Approximations

abstract:
  We study thermal behavior of a recently introduced Hartree ensemble
approximation, which allows for non-perturbative inhomogeneous field
configurations as well as for approximate thermalization, in the $\phi^4$ model
in 1+1 dimensions. Using ensembles with a free field thermal distribution as
out-of-equilibrium initial conditions we determine thermalization time scales.
The time scale for which the system stays in approximate quantum thermal
equilibrium is an indication of the time scales for which the approximation
method stays reasonable. This time scale turns out to be two orders of
magnitude larger than the time scale for thermalization, in the range of
couplings and temperatures studied. We also discuss simplifications of our
method which are numerically more efficient and make a comparison with
classical dynamics.