title: Natural ranges of supersymmetric signals

abstract:
  The LEP2 experiments pose a serious naturalness problem for supersymmetric
models. The problem is stronger in gauge mediation than in supergravity models.
Particular scenarios, like electroweak baryogenesis or gauge mediation with
light messengers, are strongly disfavoured. Searching a theoretical reason that
naturally explains why supersymmetry has not been found poses strong requests
on model building. If instead an unlikely (p\approx 5%) numerical accident has
hidden supersymmetry to LEP2, we compute the naturalness distribution of values
of allowed sparticle masses and supersymmetric loop effects. We find that b to
s gamma remains a very promising signal of minimal supersymmetry even if there
is now a 20% (4%) probability that coloured particles are heavier than 1 TeV (3
TeV). We study how much other effects are expected to be detectable.


title: Quark and Nuclear Matter in the Linear Chiral Meson Model

abstract:
  We present an analytical description of the phase transitions from a nucleon
gas to nuclear matter and from nuclear matter to quark matter within the same
model. The equation of state for quark and nuclear matter is encoded in the
effective potential of a linear sigma model. We exploit an exact differential
equation for its dependence upon the chemical potential $\mu$ associated to
conserved baryon number. An approximate solution for vanishing temperature is
used to discuss possible phase transitions as the baryon density increases. For
a nucleon gas and nuclear matter we find a substantial density enhancement as
compared to quark models which neglect the confinement to baryons. The results
point out that the latter models are not suitable to discuss the phase diagram
at low temperature.


title:
Indirect Constraints on the Triple Gauge Boson Couplings from $Z \to b
  \bar{b}$ Partial Width: An Update

abstract:
  We update the indirect bounds on anomalous triple gauge couplings coming from
the non-universal one-loop contributions to the $Z \to b \bar{b}$ width. These
bounds, which are independent of the Higgs boson mass, are in agreement with
the standard model predictions for the gauge boson self-couplings since the
present value of $R_b$ agrees fairly well with the theoretical estimates.
Moreover, these indirect constraints on $\Delta g^Z_1$ and $g^Z_5$ are more
stringent than the present direct bounds on these quantities, while the
indirect limit on $\lambda_Z$ is weaker than the available experimental data.


title: Anomalous Higgs Couplings at Colliders

abstract:
  I summarize our results on the attainable limits on the coefficients of
dimension-6 operators from the analysis of Higgs boson phenomenology using data
taken at Tevatron RUNI and LEPII. Our results show that the coefficients of
Higgs-vector boson couplings can be determined with unprecedented accuracy.
Assuming that the coefficients of all ``blind'' operators are of the same
magnitude, we are also able to impose bounds on the anomalous vector-boson
triple couplings comparable to those from double gauge boson production at the
Tevatron and LEPII.


title: Neutrino oscillation physics with a neutrino factory

abstract:
  Data from atmospheric and solar neutrinos indicate that there are at least
three neutrino types involved in oscillation phenomena. Even if the
corresponding neutrino mass scales are very different, the inevitable reference
to mixing between more than two neutrino types has profound consequences on the
planning of the accelerator experiments suggested by these results. We discuss
the measurement of mixing angles and CP phases in the context of the neutrino
beam emanating from a {\it neutrino factory}: the straight sections of a muon
storage ring. We emphasize the importance of charge identification. The
appearance of wrong sign muons in a long baseline experiment may provide a
powerful test of neutrino oscillations in the mass-difference range indicated
by atmospheric-neutrino observations.


title:
Self-consistent treatment of the quark condensate and hadrons in nuclear
  matter

abstract:
  We calculate the contribution of pions to the $\bar qq$-expectation value
$\kappa(\rho)= <M|\bar qq|M>$ in symmetric nuclear matter. We employ exact pion
propagator renormalized by nucleon-hole and isobar-hole excitations.
Conventional straightforward calculation leads to the "pion condensation" at
unrealistically small values of densities, causing even earlier restoration of
chiral symmetry. This requires a self-consistent approach, consisting in using
the models, which include direct dependence of in-medium mass values on
$\kappa(\rho)$, e.g. the Nambu-Jona-Lasinio-model. We show, that in the
self-consistent approach the $\rho$-dependence of the condensate is described
by a smooth curve. The "pion condensate " point is removed to much higher
values of density. The chiral restoration does not take place at least while
$\rho<2.8\rho_0$ with $\rho_0$ being the saturation value. Validity of our
approach is limited by possible accumulation of heavier baryons (delta isobars)
in the ground state of nuclear matter. For the value of effective nucleon mass
at the saturation density we found $m^*(\rho_0)=0.6m$, consistent with nowadays
results of other authors.


title:
Fermion Self-Energy and Chiral Symmetry Breaking from Four-Fermion and
  Gauge Interactions

abstract:
  The exact analytic solutions of the linearized Schwinger-Dyson equation of
fermion self-energy are used to obtain the effective four-fermion and gauge
coupling criticality curves for dynamical chiral symmetry breaking. The results
show that when the zero-momentum gauge coupling $\alpha(0) < \alpha_0(0)$, the
critical gauge coupling in the pure gauge interaction case, the minimal
critical four-fermion coupling $\beta_{\rm min}$ is always non-zero and
positive and will go up as the $\alpha(0)$ decreases. The use of the exact
solutions also allow us to make quite definite estimations of the momentum
scales where chiral symmetry breaking would happen if the values of an infrared
parameter $\xi$ are given separately.


title:
The additive quark model revisited: hadron and photon induced
  cross-sections

abstract:
  The standard additive quark model and the ensuing counting rules are modified
to take into account the quark-gluonic content of the Pomeron and of the
secondary Reggeons. The result is that a much improved description of $pp, \pi
p, \gamma p$ and $\gamma \gamma$ cross-sections is achieved.


title:
Hints of higher twist effects in the slope of the proton structure
  function

abstract:
  We critically analyse the data available on the reduced cross-section in
deeply inelastic $e p$ scattering from the H1 collaboration at HERA. We use
available data on the longitudinal structure function to deduce the nature of
$\d F_2/\d\ln Q^2$ at different $Q^2$ for fixed values of $x$ near $x \sim
10^{-4}$. We present the results in a manner which effectively isolates
possible higher twist effects in the structure function $F_2$.


title:
CP Violation in the Semileptonic $B_{l4}$ (B->D \pi l \nu) Decays: A
  Model Independent Analysis

abstract:
  CP violation from physics beyond the Standard Model is investigated in
$B_{l4}$ decays: $B\to D\pi l\bar{\nu}_l$. The semileptonic $B$-meson decay to
a $D$-meson with an emission of single pion is analyzed with heavy quark
effective theory and chiral perturbation theory. In the decay process, we
include various excited states as intermediate states decaying to the final
hadrons, $D+\pi$. The CP violation is implemented in a model independent way,
in which we extend leptonic current by including complex couplings of the
scalar sector and those of the vector sector in extensions of the Standard
Model. With these complex couplings, we calculate the CP-odd rate asymmetry and
the optimal asymmetry. We find that the optimal asymmetry is sizable and can be
detected at $1\sigma$ level with about $10^6$-$10^7$ $B$-meson pairs, for some
reference values of new physics effects.


title:
CP Violation in the Semileptonic $B_{l4}$ ($B->D \pi l \nu$) Decays:
  Multi-Higgs Doublet Model and Scalar-Leptoquark Models

abstract:
  CP violation from physics beyond the Standard Model is investigated in
$B_{l4}$ decays: $B\to D\pi l\bar{\nu}_l$. In the decay process, we include
various excited states as intermediate states decaying to the final hadrons,
$D+\pi$. We consider the semileptonic decay to a tau lepton family as well. The
CP violation is implemented through complex scalar--fermion couplings in the
multi-Higgs doublet model and scalar-leptoquark models beyond the Standard
Model. With these complex couplings, we calculate the CP-odd rate asymmetry and
the optimal asymmetry. We find that for $B_{\tau 4}$ decays the optimal
asymmetry is sizable and can be detected at $1\sigma$ level with about
$10^6$-$10^7$ $B$-meson pairs, for maximally-allowed values of CP-odd
parameters in those extended models.


title: Quark Gluon Plasma as a Strongly Coupled Color-Coulombic Plasma

abstract:
  We show that the extensively studied equation of state (EOS) of strongly
coupled QED plasma fits the recent lattice EOS data of gluon plasma remarkably
well, with appropriate modifications to take account of color degrees of
freedom and running coupling constant. Hence we conclude that the quark gluon
plasma near the critical temperature is a strongly coupled color-Coulombic
plasma.


title:
Mass and Coupling Constant Limits from Convergence Conditions on the
  Effective Charge in QED

abstract:
  The massless fermion limit of QED is discussed. For on-shell renormalisation
the high energy behaviour fixes no lower limit on the mass of the lightest
fermion if the fine structure constant $\alpha$ is allowed to vary. The choice
of an arbitary (space-like) subtraction point does, however, fix a lower limit
on the mass of the lightest fermion, for any subtraction scale $\mu$, if the
effective charge $\aefmu$ respects both quantum mechanical superposition and
renormalisation scale invariance. Limits on the values of $\alpha$ or the
electron mass are obtained within the Standard Electroweak Model by requiring
convergence of $\aefmz$.


title:
Convergence and Gauge Dependence Properties of the Resummed One-loop
  Quark-Quark Scattering Amplitude in Perturbative QCD

abstract:
  The one-loop QCD effective charge $\alpha_s^{eff}$ for quark-quark scattering
is derived by diagrammatic resummation of the one-loop amplitude using an
arbitary covariant gauge. Except for the particular choice of gauge parameter
$\xi = -3$, $\alpha_s^{eff}$ is found to {\it increase} with increasing
physical scale, $Q$, as $\ln Q$ or $\ln^2 Q$. For $\xi = -3$, $\alpha_s^{eff}$
decreases with increasing $Q$ and satisfies a renormalisation group equation.
Also, except for the case $\xi = 19/9$, convergence radii of geometric series
are found to impose upper limits on $Q$.


title: QCD, conformal invariance and the two pomerons

abstract:
  Using the solution of the BFKL equation including the leading and subleading
conformal spin components, we show how the conformal invariance underlying the
leading log 1/x expansion of perturbative QCD leads to elastic amplitudes
described by two effective Pomeron singularities. One Pomeron is the well-known
"hard" BFKL leading singularity while the new one appears from a shift of the
higher conformal spin BFKL singularities from subleading to leading position.
This new effective singularity is compatible with the "soft" Pomeron and thus,
together with the "hard" Pomeron, meets at large Q^2 the "double Pomeron"
solution which has been recently conjectured by Donnachie and Landshoff.


title: Dileptons, Charm and Bottom in Relativistic Heavy-Ion Collisions

abstract:
  The relation of the thermal dilepton signal from deconfined matter, resulting
in central ultra-relativistic heavy-ion collisions at RHIC and LHC energies, to
the background yields from the Drell-Yan process and correlated semileptonic
decays of open charm and bottom mesons is analyzed. We demonstrate that very
stringent kinematical cuts offer a chance to identify the thermal signal in the
continuum region.


title: Search for SUSY in (Leptons +) Jets + E_T^miss final states

abstract:
  We study the observability of the squarks and gluinos in CMS at LHC.
Classical E_T^miss + jets final state as well as a number of additional
multilepton signatures (0 leptons, 1 lepton, 2 leptons of the same sign, 2
leptons of the opposite sign and 3 leptons) are investigated . The detection of
these sparticles relies on the observation of an excess of events over Standard
Model background expectations. The study is made in the framework of a minimal
SU(5) mSUGRA model as a function of m_0, m_1/2 for 4 sets of model parameters :
tan(beta) = 2 or 35 and sign(mu) = +/- 1 and for fixed value of A_0 = 0. The
CMS detector response is modelled using CMSJET 4.51 fast MC code (non-GEANT).
The results obtained are presented as 5 sigma detection contours in the m_0,
m_1/2 planes and with optimized selection cuts in various regions of the
parameter space. The result of these investigations is that with integrated
luminosity L=10^5 pb^-1 the squark and gluino mass reach is about 2.5 TeV and
covers most of the interesting parts of parameter space according to neutralino
relic density expectations. The influence of signal and background
cross-section uncertainties on the reach contours is estimated. The effect of
pile-up on signal and background is also discussed. This effect is found to be
insignificant for E_T^miss and single lepton signatures, whilst only a minor
deterioration is seen for multilepton final states.


title: Physical Information in the Thermal Continuum Dilepton Spectra

abstract:
  We consider the intermediate mass continuum of dileptons (between $\phi$ and
$J/\psi$) in ultrarelativistic heavy--ion collisions. The thermal signal
depends essentially on thermodynamic state parameters of the hottest parton
stage as $(\tau_i\lambda^q_iT_i^3)^2$ convoluted with an involved detector
acceptance function. A refined analysis of the transverse pair momentum
spectrum at fixed dilepton transverse mass can reveal the maximum temperature
of parton matter.


title: Bell-inequalities for $K^0 \bar{K^0}$ Pairs from $\Phi$-Resonance Decays

abstract:
  We analyze the premises of recent propositions to test local realism via
Bell-inequalities using neutral kaons from $\Phi$-resonance decays as entangled
EPR-pairs. We pay special attention to the derivation of Bell-inequalities, or
related expressions, for unstable and oscillating kaon `quasi-spin' states and
to the possibility of the actual identification of these states through their
associated decay modes. We discuss an indirect method to extract probabilities
to find these states by combining experimental information with theoretical
input. However, we still find inconsistencies in previous derivations of
Bell-inequalities. We show that the identification of the quasi-spin states via
their associated decay mode does not allow the free choice to perform different
tests on them, a property which is crucial to establish the validity of any
Bell-inequality in the context of local realism. In view of this we propose a
different kind of Bell-inequality in which the free choice or adjustability of
the experimental set-up is guaranteed. We also show that the proposed
inequalities are violated by quantum mechanics.


title: Radiative Leptonic B_c Decays in Effective Field Theory

abstract:
  The recent discovery of the B_c meson by the CDF collaboration and proposed
new experiments at Fermilab and CERN motivate new theoretical studies of the
B_c system. Here we investigate the radiative leptonic decay B_c -> gamma l nu.
This process is an important background to the annihilation process B_c -> l
nu, which will be used to extract the B_c decay constant. We perform a
model-independent calculation, based on QCD, of the partial width and various
kinematic distributions. We also examine the decay within the framework of
NRQCD, an effective field theory of nonrelativistic quarks, generalizing the
NRQCD Lagrangian to include external sources for the weak and electromagnetic
currents. Finally, we comment on the role of the B_c* intermediate state for
very soft photon energies.


title: Bell-inequalities for Entangled Neutral Kaons

abstract:
  We extend the use of Bell-inequalities to $\Phi \to K^0 \bar{K^0}$ decays by
exploiting analogies and differences to the well-known and experimentally
verified singlet-spin case. Contrasting with other analyses, our
Bell-inequalities are violated by quantum mechanics and can strictly be derived
from local realistic theories. In principle, quantum mechanics could then be
tested using unstable, oscillating states governed by a CP-violating
Hamiltonian.


title: Solutions to the Atmospheric Neutrino Problem

abstract:
  I summarize here the results of a global fit to the full data set
corresponding to 535 days of data of the Super-Kamiokande experiment as well as
to all other atmosferic neutrino experiments in order to compare the most
likely solutions to the atmospheric neutrino anomaly in terms of oscillations
in the $\nu_\mu \to \nu_e$, $\nu_\mu \to \nu_\tau$, and $\nu_\mu \to \nu_s$
channels.


title: Limits on Majorana Neutrinos from Recent Experimental Data

abstract:
  We investigate the sensitivity of some weak processes to the simplest
extension of the Standard Model with Majorana neutrinos mixing in the leptonic
sector. Values for mixing angles and masses compatible with several
experimental accelerator data and the most recent neutrinoless double--$\beta$
decay limit were found.


title:
On the consistency of LEAR experimets and FENICE in the sector of $p\bar
  p$ interaction near the threshold

abstract:
  Some experiments on LEAR obtained unusual behavior of the $p\bar p$
interaction near the threshold. The experiments on $p\bar p$ forvard scattering
detected zeros and big variation of $\rho$ and at the same time a smooth rising
of ${\sigma}_{tot}$ with lowing energy. Many models has difficulties in
explanating this fact. In the PS170 experiment with a good statistical accuracy
the unexpected behavior of the proton electromagnetic form factor was found.
All these experiments can be considered as an indication for the existence of a
low lying $p\bar p$ bound state 'baryonium'. This statement coincides with that
made for interpretation of the energy dependence of the total cross-section
$e^{+}e^{-}\to hadrons$ in FENICE. There is a model (based on analyticity)
which explained aforementioned experiments and the fact that this 'baryonium'
is not seen in the OBELIX $p\bar p$ annihilation cross-section. Thus LEAR
experiments and FENICE one are consistent near $p\bar p$ threshold and
compatible with the existence of 'baryonium'.


title: Light Meson Spectroscopy

abstract:
  We survey the current status of light meson spectroscopy. We begin with a
general introduction to meson spectroscopy and and its importance in
understanding the physical states of Quantum Chromo Dynamics (QCD).
Phemenological models of hadron spectroscopy are described with particular
emphasis on the constituent quark model and the qualitative features it
predicts for the meson spectrum. We next discuss expectations for hadrons lying
outside the quark model, such as hadron states with excited gluonic degrees of
freedom. These states include so-called hybrids glueballs}, as well as
multiquark states. The established meson states are compared to the quark model
predictions and we find that most meson states are well described by the quark
model. However, a number of states in the light-quark sector do not fit in
well, suggesting the existence of hadronic states with additional degrees of
freedom. We end with a brief description of future directions in meson
spectroscopy.


title: Baryon axial currents

abstract:
  The baryon axial currents are calculated at one-loop order in heavy baryon
chiral perturbation theory by employing both a cutoff and dimensional
regularization. Data from the semileptonic baryon decays is used to perform a
least-squares fit to the two axial couplings D and F of the effective
Lagrangian. Predictions for the momentum dependent axial form factors are made
and the two different regularization schemes are compared. We also include the
spin-3/2 decuplet in the effective theory.


title: Observable Isocurvature Fluctuations from the Affleck-Dine Condensate

abstract:
  In D-term inflation models, Affleck-Dine baryogenesis produces isocurvature
density fluctuations. These can be perturbations in the baryon number, or, in
the case where the present neutralino density comes directly from B-ball decay,
perturbations in the number of dark matter neutralinos. The latter case results
in a large enhancement of the isocurvature perturbation. The requirement that
the deviation of the adiabatic perturbations from scale invariance due to the
Affleck-Dine field is not too large then imposes a lower bound on the magnitude
of the isocurvature fluctuation of about $10^{-2}$ times the adiabatic
perturbation. This should be observable by MAP and PLANCK.


title: Tests of Higgs Boson Couplings at a mu+mu- Collider

abstract:
  We investigate the potential of a muon collider for testing the presence of
anomalous Higgs boson couplings. We consider the case of a light (less than
$160 GeV$) Higgs boson and study the effects on the Higgs branching ratios and
total width, which could be induced by the non standard couplings created by a
class of dim=6 $SU(3)\times SU(2)\times U(1)$ gauge invariant operators
satisfying the constraints imposed by the present and future hadronic and
$e^-e^+$ colliders. For each operator we give the minimal value of the
$\mu^+\mu^-$ integrated luminosity needed for the muon collider ($\mu C$) to
improve these constraints. Depending on the operator and the Higgs mass, this
minimal $\mu C$ luminosity lies between $0.1 fb^{-1}$ and $100 fb^{-1}$.


title: Precision tests of the Standard Model from Z physics

abstract:
  The measurements performed at LEP and SLC have substantially improved the
precision of the test of the Minimal Standard Model. The precision is such that
there is sensitivity to pure weak radiative corrections. This allows to
indirectly determine the top mass (\mt=161$\pm$8 GeV), the W-boson mass
(\MW=80.37$\pm$0.03 GeV), and to set an upper limit on the the Higgs boson mass
of 262 GeV at 95% confidence level.


title: Are there anomalous Z fermion couplings ?

abstract:
  The couplings of the fermions to the Z boson are of great importance in
establishing the validity of the Standard Model and in looking for physics
beyond it.
  The couplings of the b-quark to the Z boson have been the subject of much
experimental study and theoretical interpretation. The apparent excess in the
value of $\Rbbz$, the ratio of the partial width of the Z boson to $\bbbar$ to
its total hadronic width, above the Standard Model expectation reported a few
years ago has now become much less significant. However, the measurements of
the pole forward-backward asymmetry $\Afbzb$ for b-quarks at the Z pole and of
the {\it polarisation parameter} $\Ab$, obtained using a polarised electron
beam, have improved considerably in accuracy.
  The latest data are examined and values of the vector and axial-vector
b-quark and c-quark couplings to the Z are extracted. The left and right handed
couplings are also extracted. It is found that whereas the c-quark couplings
are compatible with the Standard Model, those of the b-quark data are only
compatible with the Standard Model at about the 1% level. In addition, the
individual lepton couplings are extracted and the hypothesis of {\it lepton
universality} is examined.
  The sensitivity of the limits from electroweak fits to the Higgs boson mass
to these data is examined.


title:
Associated jpsi + gamma production through double Pomeron exchange: The
  nature of the Pomeron and hard diffractive factorization breaking

abstract:
  We present a study of associated jpsi + gamma production through double
Pomeron exchange at energies reached at the Fermilab Tevatron and CERN LHC
based on the Ingelman-Schlein model for hard diffractive scattering and the
factorization formalism of nonrelativistic QCD for quarkonia production. We
find that this process (p + pbar \to p + pbar + jpsi + gamma + X) can be used
to probe the gluon content of the Pomeron and study the natrue of hard
diffractive factorization breaking.


title:
Minijet transverse energy production in the next-to-leading order in
  hadron and nuclear collisions

abstract:
  The transverse energy flow generated by minijets in hadron and nuclear
collisions into a given rapidity window in the central region is calculated in
the next-to-leading (NLO) order in QCD at RHIC and LHC energies. The NLO
transverse energy production in pp collisions cross sections are larger than
the LO ones by the factors of K_{RHIC} ~ 1.9 and K_{LHC} ~ 2.1 at RHIC and LHC
energies correspondingly. These results were then used to calculate transverse
energy spectrum in nuclear collisions in a Glauber geometrical model. We show
that accounting for NLO corrections in the elementary pp collisions leads to a
substantial broadening of the E_{perp} distribution for the nuclear ones, while
its form remains practically unchanged.


title:
Probing a Nucleon Spin Structure at TESLA by the Real Polarized Gamma
  Beam

abstract:
  The recent proposals concerning the usage of the real polarized gamma beam,
obtained by the Compton backscattering of the laser photons off the electron
beams from either the linear or circular accelerators were considered. The
heavy quark photoproduction process giving a unique opportunity to measure
polarized gluon distribution was investigated.


title: Neutrinos Mass and Mixing

abstract:
  I review the status of neutrino masses and mixings in the light of the solar
and atmospheric neutrino data. The result from the LSND experiment and the
possible role of neutrinos as hot dark matter are also included. I also discuss
the simplest schemes proposed to reconcile these data which include a light
sterile neutrino in addition to the three standard ones. Implications for
future experiments are commented.


title: Perturbation Analysis of Deformed Q-Balls and Primordial Magnetic Field

abstract:
  We study the excited states of the Q-balls by performing stationary
perturbation on the spherical Q-balls. We find the exact solution of the
stationary perturbation of the global Q-ball with thin wall approximation. For
local Q-balls we solve the equations of motion for the perturbative part
approximately by using expansion about the coupling constant. Furthermore we
comment on the magnetic field generated by the excited Q-balls during the phase
transition precipitated by solitosyhthesis and give an implication into
cosmology.


title: Explicit lepton texture

abstract:
  An explicit form of charged--lepton mass matrix, predicting $ m_\tau =
1776.80 $~MeV from the experimental values of $ m_e $ and $ m_\mu$ (in good
agreement with the experimental figure $ m_\tau = 1777.05^{+0.29}_{-0.26}$
MeV), is applied to three neutrinos $\nu_e $, $\nu_\mu $, $\nu_\tau $ in order
to correlate tentatively their masses and mixing parameters. While for charged
leptons the off--diagonal mass--matrix elements turn out to be small {\it
versus} its diagonal elements, it is suggested that for neutrinos the situation
is inverse. Under such a conjecture, the neutrino masses, lepton \CKM matrix
and neutrino oscillation probabilities are calculated in the corresponding
lowest (and the next to lowest) perturbative order. Then, the nearly maximal
mixing of $\nu_\mu $ and $\nu_\tau $ is predicted in consistency with the
observed deficit of atmospheric $\nu_\mu $'s. However, the predicted deficit of
solar $\nu_e $'s is much too small to explain the observed effect, what
suggests the existence of (at least) one sort, $\nu_s $, of sterile neutrinos,
whose mixing with $\nu_e$ would be responsible for the observed deficit. In the
last Section, promising perspectives for applying the same form of mass matrix
to quarks are outlined. Two independent predictions of $|V_{ub}|/|V_{cb}| =
0.0753 \pm 0.0032 $ and unitary angle $\gamma \simeq 70^\circ $ are deduced
from the experimental values of $|V_{us}|$ and $|V_{cb}|$ (with the use of
quark masses $ m_s $, $ m_c $ and $ m_b $).


title: Fermionic Bound States and Pseudoscalar Exchange

abstract:
  We discuss the possibility that fermions bind due to Higgs or pseudoscalar
exchange. It is reasonable to believe on qualitative grounds that this can
occur for fermions with a mass larger than 800-900 GeV. An exchange of a
pseudoscalar boson leads in the non-relativistic limit to an unacceptable
potential which behaves like 1/r^3 at the origin. We show that this singular
behaviour is smeared out when relativistic effects are included.


title:
A BFKL Monte Carlo Approach to Jet Production at Hadron-hadron and
  Lepton-hadron Colliders

abstract:
  The production of a pair of jets with large rapidity separation in
hadron-hadron collisions, and of forward jets in deep inelastic scattering, can
in principle be used to test the predictions of the BFKL equation. However in
practice kinematic constraints lead to a strong suppression of BFKL effects for
these processes. This is illustrated using a BFKL Monte Carlo approach.


title: Gluon Radiation in Top Mass Reconstruction: Effect of Hadronic W Decays

abstract:
  Top quark events in hadron collisions often contain additional hadronic jets
from gluon bremsstrahlung off the quarks and gluons in the hard subprocesses.
Such extra jets must be taken into account in attempts to reconstruct the
momentum of the top quark from those of its decay products. We have performed a
complete calculation of gluon radiation in top production and decay at the
Fermilab Tevatron including hadronically decaying W bosons. In this talk we
discuss the effect of gluon radiation on the reconstructed mass of the top
quark, using various top mass reconstruction scenarios. Implications for the
LHC are briefly discussed.


title:
Leading particle effect, inelasticity and the connection between average
  multiplicities in {\bf $e^+e^-$} and {\bf $pp$} processes

abstract:
  The Regge-Mueller formalism is used to describe the inclusive spectrum of the
proton in $p p$ collisions. From such a description the energy dependences of
both average inelasticity and leading proton multiplicity are calculated. These
quantities are then used to establish the connection between the average
charged particle multiplicities measured in {\bf $e^+e^-$} and {\bf $pp/{\bar
p}p$} processes. The description obtained for the leading proton cross section
implies that Feynman scaling is strongly violated only at the extreme values of
$x_F$, that is at the central region ($x_F \approx 0$) and at the diffraction
region ($x_F \approx 1$), while it is approximately observed in the
intermediate region of the spectrum.


title: Vortex String Formation in a 3D U(1) Temperature Quench

abstract:
  We report the first large scale numerical study of the dynamics of the second
order phase transition of a U(1) $\lambda \phi^4$ theory in three spatial
dimensions. The transition is induced by a time-dependent temperature drop in
the heat bath to which the fields are coupled. We present a detailed account of
the dynamics of the fields and vortex string formation as a function of the
quench rate. The results are found in good agreement to the theory of defect
formation proposed by Kibble and Zurek.


title: String derived MSSM and M-theory Unification

abstract:
  The recent conjecture of possible equivalence between the string scale $M_S$
and the minimal supersymmetric standard model unification scale M_U ~ 2.5 x
10^{16} GeV is considered in the context of string models. This conjecture
suggests that the observable gauge group just below the string scale should be
SU(3)_C x SU(2)_L x U(1)_Y and that the SU(3)_C x SU(2)_L x U(1)_Y-charged
spectrum of the observable sector should consist solely of the MSSM spectrum.
We demonstrate that string models can actually be constructed that possess
these observable features. Two aspects generic to many classes of three family
SU(3)_C x SU(2)_L x U(1)_Y string models are both an extra local anomalous
U(1)_A and numerous (often fractionally charged) exotic particles beyond the
MSSM. Thus, for these classes, the key to obtaining an M_S = M_U ~ 2.5 x
10^{16} GeV string model is the existence of F- and D-flat directions that near
the string scale can simultaneously break the anomalous U(1) and give mass to
all exotic SM-charged observable particles, decoupling them from the low energy
spectrum. In this letter we show, in the context of free fermionic strings,
that string models with flat directions possessing these features do exist. We
present one such string derived model in which all such exotic observable
states beyond the MSSM receive mass at the scale generated by the Fayet-
Iliopoulos term. The associated F- and D-flat direction is proven flat to all
orders of the superpotential.


title:
Light Neutrinos without Heavy Mass Scales: A Higher-Dimensional Seesaw
  Mechanism

abstract:
  Recent theoretical developments have shown that extra spacetime dimensions
can lower the fundamental GUT, Planck, and string scales. However, recent
evidence for neutrino oscillations suggests the existence of light non-zero
neutrino masses, which in turn suggests the need for a heavy mass scale via the
seesaw mechanism. In this paper, we make several observations in this regard.
First, we point out that allowing the right-handed neutrino to experience extra
spacetime dimensions naturally permits the left-handed neutrino mass to be
power-law suppressed relative to the masses of the other fermions. This occurs
due to the power-law running of the neutrino Yukawa couplings, and therefore
does not require a heavy scale for the right-handed neutrino. Second, we show
that a higher-dimensional analogue of the seesaw mechanism may also be capable
of generating naturally light neutrino masses without the introduction of a
heavy mass scale. Third, we show that such a higher-dimensional seesaw
mechanism may even be able to explain neutrino oscillations without neutrino
masses, with oscillations induced indirectly via the masses of the Kaluza-Klein
states. Fourth, we point out that even when higher-dimensional right-handed
neutrinos are given a bare Majorana mass, the higher-dimensional seesaw
mechanism surprisingly replaces this mass scale with the radius scale of the
extra dimensions. Finally, we also discuss a possible new mechanism for
inducing lepton-number violation by shifting the positions of D-branes in Type
I string theory.


title: Polarization properties of diffractively produced \Lambda_c^+

abstract:
  The Pomeron-gluon-gluon interaction is considered in the QCD-based model for
the charmed baryon production in the process Pomeron + p --> \Lambda_c^+ + X.
  The polarization of the produced heavy quark is induced effectively through
the non-perturbative long-range interaction with the gluon field of the type
[sigma*rotA]. The x_F-dependence of \Lambda_c^+ polarization, P_(x_F,p_T), has
been studied. Its absolute value depends on the model parameter a and it
appears to be sizeable in the wide range of a values: when a ranges from 0.1 to
1.0, the polarization P(x_F,p_T) varies from --0.2 to --0.5 at x_F ~ 0.5 and
p_T in the interval 1 - 2 GeV/c.


title: Top decays into lighter stop and gluino

abstract:
  We have calculated the decay width of the process $t \to \tilde{g}
\tilde{t}_1$ including one loop QCD corrections. We found that the decay width
of the such process could be comparable with that of the standard channel $t
\to b W^+$, and, its QCD correction could enhance the widths over 30% in a very
large mass range of the lighter stop.


title: Yukawa coupling corrections to the decay $H^+ \to W^+ A^0$

abstract:
  We compute the fermionic radiative contributions to the decay $H^+ \to
W^{+(*)} A^0$ in the framework of models with two Higgs doublets (2HDM), for
the case of an on-shell and off-shell W. We show that, in the majority of the
cases, current measurements of the $\rho$ parameter suggest $M_{H^{\pm}}\ge
M_A$ and such decays could invalidate current charged Higgs searches or aid
detection in the region $M_{H^{\pm}}\approx M_W$. We find that the radiative
corrections may approach 50% for small values of $\tan\beta$.


title:
CosmoParticle Physics: Basic Principles and Prospects for Future
  Development

abstract:
  COSMOPARTICLE PHYSICS is the specific crossdisciplinary field of science,
studying foundations of particle physics and cosmology in the combination of
indirect cosmological, astrophysical and physical signatures of their
fundamental relationship. The possibilities to elaborate unique theoretical
grounds for cosmology and particle physics and to study quantitative
relationships between cosmological and laboratory effects follow from the basic
principles of cosmoparticle physics and open new interesting fields of
scientific research in its future development.


title: Nonequilibrium chiral perturbation theory and pion decay functions

abstract:
  We extend chiral perturbation theory to study a meson gas out of thermal
equilibrium. Assuming that the system is initially in equilibrium below the
critical temperature and working within the Schwinger-Keldysh contour
technique, we define consistently the time-dependent pion decay functions, the
counterparts of the pion decay constants, and calculate them up to next to
leading order. The link with curved space-time QFT allows to establish
nonequilibrium renormalisation. The short-time behaviour and the applicability
to a heavy-ion collision plasma are also discussed in this work.


title: Radiative corrections to W-pair production in e+e- annihilation

abstract:
  The status of precision calculations for the processes e+e- --> WW --> 4
fermions is reviewed, paying particular attention to questions of gauge
invariance and recent progress concerning photonic radiative corrections.


title: Hyperon Non-leptonic Weak Decays in the Chiral Perturbation Theory II

abstract:
  Hyperon non-leptonic weak decay amplitudes are studied in the chiral
perturbation theory. The weak interaction vertices caused by the four quark
operators are substituted by the products of the hadronic currents and by the
phenomenologically introduced weak Hamiltonian of hadron operators. Our study
suggests the improvement of the theoretical prediction for the weak decay
amplitudes.


title: Light Pair Correction to Bhabha Scattering at Small Angle

abstract:
  This work deals with the computation of electron pair correction to small
angle Bhabha scattering, in order to contribute to the improvement of
luminometry precision at LEP/SLC below 0.1% theoretical accuracy. The exact QED
four-fermion matrix element for $e^+e^-\to e^+e^-e^+e^-$, including all
diagrams and mass terms, is computed and different Feynman graph topologies are
studied to quantify the error of approximate calculations present in the
literature. Several numerical results, obtained by a Monte Carlo program with
full matrix element, initial-state radiation via collinear structure functions,
and realistic event selections, are shown and critically compared with the
existing ones. The present calculation, together with recent progress in the
sector of $O(\alpha^2)$ purely photonic corrections, contributes to achieve a
total theoretical error in luminometry at the 0.05% level, close to the current
experimental precision and important in view of the final analysis of the
electroweak precision data.


title:
Six-fermion production and Higgs boson physics at future $e^+ e^-$
  colliders

abstract:
  The six-fermion production processes $e^+e^-\to q\bar q l^+ l^-\nu\bar\nu$,
with all the lepton flavours and $q=u,d,c,s$, relevant to the study of the
intermediate-mass Higgs boson at future $e^+e^-$ linear colliders, are
analysed. A Monte Carlo program, taking into account the whole set of
tree-level scattering amplitudes and the relevant radiative effects, is
developed to provide integrated cross sections and generation of unweighted
events. The complete calculation is compared with the available results of real
Higgs production, and the opportunities of precision studies with event
generation are discussed, demonstrating the relevance of a full six-fermion
calculation. Numerical results for integrated cross sections with various
kinematical cuts and including radiative effects are given and commented. In
the analysis of event samples, several distributions are studied and found to
be sensitive to the presence and to the properties of the Higgs boson.


title:
Bubble-nucleation rates for radiatively induced first-order phase
  transitions

abstract:
  We present a consistent calculation of bubble-nucleation rates in theories of
two scalar fields. Our approach is based on the notion of a coarse-grained free
energy that incorporates the effects of fluctuations with momenta above a given
scale k. We establish the reliability of the method for a variety of two-scalar
models and confirm the conclusions of previous studies in one-field theories:
Langer's theory of homogeneous nucleation is applicable as long as the
expansion around the semiclassical saddle point associated with tunnelling is
convergent. This expansion breaks down when the exponential suppression of the
rate by the saddle-point action becomes comparable to the pre-exponential
factor associated with fluctuations around the saddle point. We reconfirm that
Langer's theory is not applicable to the case of weakly first-oder phase
transitions. We also find that the same is true in general for radiatively
induced first-order phase transitions. We discuss the relevance of our results
for the electroweak phase transition and the metastability bound on the
Higgs-boson mass.


title: Pomeron Flux Factor and Diffractive W and Jet Rates

abstract:
  Experimental rates of W and dijets diffractively produced at the Tevatron
Collider have recently become available. We use parametrizations of the pomeron
structure function obtained from HERA data by two different schemes to compare
theoretical expectations with the measured rates.


title:
Distinguishing Indirect Signatures of New Physics at the NLC: Z' Versus
  R-Parity Violation

abstract:
  R-parity violation and extensions of the Standard Model gauge structure offer
two non-minimal realizations of supersymmetry at low energies that can lead to
similar new physics signatures at existing and future colliders. We discuss
techniques that can be employed at the NLC below direct production threshold to
distinguish these two new physics scenarios.


title:
Gauge Lattice Simulation of the soft QGP Dynamics in Ultra-Relativistic
  Heavy-Ion Collisions

abstract:
  In a fully relativistic approach, a RLSM description of nuclei colliding at
ultra-relativistic energies can be formulated within the framework of a
classical transport theory. The valence quarks of the nucleons are described
through collections of classical point-like particles moving in the continuum.
They are coupled to soft gluon fields which are described through the Yang
Mills equations on a gauge lattice. In a first step, we focus on the range of
low-$p_t$ interactions. Results from numerical model simulations of pure
gluonic nucleus-nucleus collisions on SU(2) gauge lattices in 3+1 dimensions
are presented. They show an effect which we call the glue burst.


title: With Neutrino Masses Revealed, Proton Decay is the Missing Link

abstract:
  By way of paying tribute to Abdus Salam, I recall the ideas of higher
unification that he and I initiated. I discuss the current status of those
ideas in the light of recent developments, including those of: (a) gauge
coupling unification, (b) discovery of neutrino-oscillation at SuperKamiokande,
and (c) ongoing searches for proton decay. It is remarked that the mass of
$\nu_\tau$ ($\sim$ 1/20 eV) suggested by the SuperK result seems to provide
clear support for an underlying unity of forces based on the ideas of (i)
SU(4)-color, (ii) left-right symmetry and (iii) supersymmetry. The change in
perspective, pertaining to both gauge coupling unification and proton decay,
brought forth by supersymmetry and superstrings is presented. The beneficial
roles of string- symmetries in addressing certain naturalness problems of
supersymmetry, including that of rapid proton decay, are noted. In the last
section, attention is drawn to the recent joint works with K. Babu and F.
Wilczek, where the influence of neutrino masses and thus of the new SuperK
result on proton decay are noted. In this context, it is remarked that with
neutrino masses and coupling unification revealed, the discovery of proton
decay, that remains as the missing link, should not be far behind.


title: Doubly Charged Higgsino Pair Production and Decays in e+e- Collisions

abstract:
  In supersymmetric grand unified theories, light higgsino multiplets generally
exist in addition to the familiar chargino/neutralino multiplets of the minimal
supersymmetric extension of the Standard Model. The new multiplets may include
doubly charged states $\tilde\Delta^{\pm\pm}$ and $\tilde\delta^{\pm\pm}$. We
study the properties and the production channels of these novel higgsinos in
$e^+e^-$ and $\gamma\gamma$ collisions, and investigate how their properties
can be analyzed experimentally.


title:
Generalized Limits to the Number of Light Particle Degrees of Freedom
  from Big Bang Nucleosynthesis

abstract:
  We compute the big bang nucleosynthesis limit on the number of light neutrino
degrees of freedom in a model-independent likelihood analysis based on the
abundances of He4 and Li7. We use the two-dimensional likelihood functions to
simultaneously constrain the baryon-to-photon ratio and the number of light
neutrinos for a range of He4 abundances $Y_p$ = 0.225 -- 0.250, as well as a
range in primordial Li7 abundances from (1.6 to 4.1) $ \times 10^{-10}$. For
(Li7/H)$_p = 1.6 \times 10^{-10}$, as can be inferred from the Li7 data from
Population II halo stars, the upper limit to $N_\nu$ based on the current best
estimate of the primordial He4 abundance of $Y_p = 0.238$, is $N_\nu < 4.3$ and
varies from $N_\nu < 3.3$ (at 95% C.L.) when $Y_p=0.225$ to $N_\nu < 5.3$ when
$Y_p=0.250$. If Li7 is depleted in these stars the upper limit to $N_\nu$ is
relaxed. Taking (Li7/H)$_p = 4.1 \times 10^{-10}$, the limit varies from $N_\nu
< 3.9$ when $Y_p = 0.225$ to $N_\nu \la 6$ when $Y_p = 0.250$. We also consider
the consequences on the upper limit to $N_\nu$ if recent observations of
deuterium in high-redshift quasar absorption-line systems are confirmed.


title:
Inherent Biases in the Ansatz Function Method used to Search for New
  Particles Decaying to Two-Jets in pbarp Collisions

abstract:
  Searches for new resonant phenomena on top of a continuum spectra need to
make assumptions regarding the shape of the continuum spectra. The Ansatz
function method used in previous searches for new particles decaying to dijets
is investigated and found to have inherent biases that cause the 95% confidence
limits on the signal cross-section to be miss-measured by up to 30 to 50%.


title: Diffuse Ionization in the Milky Way and Sterile Neutrinos

abstract:
  We propose the radiative decay of sterile neutrinos which fill a fraction of
the halo dark matter with a mass of 27.4 eV and lifetime of $\sim 10^{22}$ sec.
as a way to explain the observed diffuse ionization in the Milky Way galaxy.
Since the sterile neutrino number density in the present universe can be
adjusted by arranging its dynamics appropriately, the resulting hot dark matter
contribution to $\Omega_m$ can be small as required by many scenarios of
structure formation. On the other hand a 27.4 eV neutrino could easily be the
partial halo dark matter. One realization of this idea could be in the context
of a mirror universe theory where the gauge and matter content of the standard
model are completely duplicated in the mirror sector (except for an asymmetry
in the weak scale); the three mirror neutrinos can mix with the known neutrinos
via some strongly suppressed mechanism such as the gravitational or heavy right
handed neutrino mediated forces. Two of the mirror neutrinos (say $\nu'_{\mu}$
and $\nu'_{\tau}$) could play the role of the above sterile neutrino.


title: Grand unified textures for neutrino and quark mixings

abstract:
  The atmospheric neutrino data imply large mixing between the $\nu_\mu$ and
$\nu_\tau$ states, $\theta_{23} = (45\pm 12)^\circ$, while the MSW solution to
the solar neutrino problem needs very small mixing angle $\theta_{12} = (2\pm
1)^\circ$. In the quark sector the situation is rather opposite -- the 23
mixing is tiny, $\theta_{23}\simeq 2^\circ$, versus reasonable 12 mixing,
$\theta_{12}\simeq 13^\circ$. We show that such complementary patterns of the
quark and leptonic mixings could naturally emerge in the context of the SU(5)
grand unification, assuming that the fermion mass matrices have the
Fritzsch-like structures but their off-diagonal entries are not necessarily
symmetric. Such a picture exhibits a `see-saw' like correspondence between the
quark and leptonic mixing patterns so that the smaller the quark mixing angle
is, the larger the corresponding leptonic mixing angle becomes. This fact
simply follows from the fermion multiplet structure in SU(5). We also discuss a
model with horizontal symmetry U(2) in which the discussed pattern of the mass
matrices can arise rather naturally.


title: Neutrino Masses from Large Extra Dimensions

abstract:
  Recently it was proposed that the standard model (SM) degrees of freedom
reside on a $(3+1)$-dimensional wall or ``3-brane'' embedded in a
higher-dimensional spacetime. Furthermore, in this picture it is possible for
the fundamental Planck mass $\mst$ to be as small as the weak scale $\mst\simeq
O(\tev)$ and the observed weakness of gravity at long distances is due the
existence of new sub-millimeter spatial dimensions. We show that in this
picture it is natural to expect neutrino masses to occur in the $10^{-1} -
10^{-4}\ev$ range, despite the lack of any fundamental scale higher than
$\mst$. Such suppressed neutrino masses are not the result of a see-saw, but
have intrinsically higher-dimensional explanations. We explore two
possibilities. The first mechanism identifies any massless bulk fermions as
right-handed neutrinos. These give naturally small Dirac masses for the same
reason that gravity is weak at long distances in this framework. The second
mechanism takes advantage of the large {\it infrared} desert: the space in the
extra dimensions. Here, small Majorana neutrino masses are generated by
breaking lepton number on distant branes.


title:
The effect of $B\pi$ continuum in the QCD sum rules for the $(0^+, 1^+)$
  heavy meson doublet in HQET

abstract:
  We study the effect of $B\pi$ continuum in the QCD sum rule analysis of the
heavy meson doublet $(0^+, 1^+)$ in the leading order of heavy quark effective
theory. New sum rules are derived for the leading order binding energy ${\bar
\Lambda_{+,{1\over 2}}}$ and pionic coupling constant $g'$.


title:
Large - Distance Effects in QCD and Spin Asymmetries in Diffractive
  Reactions

abstract:
  Large - distance effects in the hadron wave function for the hadron-Pomeron
vertex in the QCD -model are discussed. It is shown that they lead to the
spin-flip part of the Pomeron coupling which can reach $10 \div 20 %$ with
respect to the non-flip part. The obtained structure of the Pomeron coupling
modifies spin asymmetries in high--energy diffractive reactions where the
Pomeron structure becomes determinative. We study spin asymmetries in exclusive
reactions and in the diffractive $Q \bar Q$ and $J/\Psi$ production. We have
found that spin effects in these diffractive processes are sensitive to the
spin-flip part of the Pomeron coupling.


title:
Hadronic Axion Model in Gauge-Mediated Supersymmetry Breaking and
  Cosmology of Saxion

abstract:
  Recently we have proposed a simple hadronic axion model within gauge-mediated
supersymmetry breaking. In this paper we discuss various cosmological
consequences of the model in great detail. A particular attention is paid to a
saxion, a scalar partner of an axion, which is produced as a coherent
oscillation in the early universe. We show that our model is cosmologically
viable, if the reheating temperature of inflation is sufficiently low. We also
discuss the late decay of the saxion which gives a preferable power spectrum of
the density fluctuation in the standard cold dark matter model when compared
with the observation.


title: Non-Equilibrium Universe and Black Hole Evaporation

abstract:
  The evaporation of the black holes during the very early universe is studied.
Starting from black hole filled universe, the distiributions of particle
species are calculated and showed, that they differ remarkably from the
corresponding equilibrium distributions. This may have great impact to the
physics of the very early universe. Also the evolution of the universe during
the evaporation has been studied.


title: Solving the Schroedinger equation for bound states with Mathematica 3.0

abstract:
  Using Mathematica 3.0, the Schroedinger equation for bound states is solved.
The method of solution is based on a numerical integration procedure together
with convexity arguments and the nodal theorem for wave functions. The
interaction potential has to be spherically symmetric. The solving procedure is
simply defined as some Mathematica function. The output is the energy
eigenvalue and the reduced wave function, which is provided as an interpolated
function (and can thus be used for the calculation of, e.g., moments by using
any Mathematica built-in function) as well as plotted automatically.


title: Supersymmetric Theories with R-Parity Violation

abstract:
  In these Lectures we review the Minimal Supersymmetric Standard Model as well
as some of its extensions that include R-Parity violation. The cases of
spontaneous breaking of R-Parity as well as that of explicit violation through
bilinear terms in the superpotential are studied in detail. The signals at LEP
and the prospects for LHC are discussed.


title:
Factorization scheme analysis of $F_2^{\gamma}(x,Q^2)$ and parton
  distributions functions of the photon

abstract:
  Factorization scheme analysis of $F_2^{\gamma}(x,Q^2)$ in the next-to-leading
order QCD is revisited. It is emphasized that the presence of the inhomogeneous
term in the evolution equations for quark distribution functions of the photon
implies subtle but important difference in the way factorization mechanism
works in photon-hadron and photon-photon collisions as compared to the hadronic
ones. It is argued that none of the existing NLO analyses of
$F_2^{\gamma}(x,Q^2)$ takes this difference properly into account. The source
of the ensuing incompleteness is traced back to the misinterpretation of the
behaviour of $q^{\gamma}(x,M)$ as a function of $\alpha_s(M)$. Parton model
interpretation of the so called ``constant terms'' in the LO photonic
coefficient function $C_{\gamma}^{(0)}(x)$ is given and smooth transition
between the properties of virtual and real photon analyzed. Finally
phenomenological consequences of this analysis are discussed.


title: The Standard Electroweak Theory and Beyond

abstract:
  This set of lectures provides an elementary introduction to the standard
electroweak theory, followed by a detailed discussion of its experimental
tests. We then consider the conceptual limitations of the Standard Model and
briefly review the existing phenomenological indications of new physics. We
summarize the case for a supersymmetric extension of the Standard Model.
Finally we describe the present and planned searches for the Higgs and for new
physics.


title: Theoretical Issues in Rare K, D and B Decays

abstract:
  I discuss some theoretical aspects of rare $K$, $D$ and $B$ decays focusing
mainly on their potential as tests of the one loop structure of the standard
model. I concentrate on flavor changing neutral current processes and compare
our ability to extract short distance physics in the three cases. Finally, I
give some examples of the sensitivity of these decays to extensions of the
standard model.


title:
Nonlinear Supersymmetric Effective Lagrangian and Goldstino Interactions
  at High Energies

abstract:
  We show that the nonlinear supersymmetric effective lagrangian can be used
for model-independent parameterization of the light gravitino scattering
amplitude at energies up to and above the soft supersymmetry-breaking masses.
This provides the most convenient framework for systematic studies of goldstino
phenomenology both at low energies and in high energy colliders.


title:
Distinguishing Hadronic Cascades from Hydrodynamic Models in Pb(160
  AGeV)+Pb Reactions by Impact Parameter Variation

abstract:
  We propose to study the impact parameter dependence of the
anti-Lambda/anti-Proton ratio in Pb(160AGeV)+Pb reactions. The
anti-Lambda/anti-Proton ratio is a sensible tool to distinguish between
hadronic cascade models and hydrodynamical models, which incorporate a QGP
phase transition.


title: Implications of Solar and Atmospheric Neutrinos

abstract:
  The importance of non-zero neutrino mass as a probe of particle physics,
astrophysics, and cosmology is emphasized. The present status and future
prospects for the solar and atmospheric neutrinos are reviewed, and the
implications for neutrino mass and mixing in 2, 3, and 4-neutrino schemes are
discussed. The possibilities for significant mixing between ordinary and light
sterile neutrinos are described.


title: The Problem of the Quark-Lepton Mass Spectrum

abstract:
  We review some approaches to the quark-lepton mass problem. The ideas of
mass-protection and approximate chiral flavour symmetries as a framework for
resolving the mass hierarchy problem are presented. Dynamical calculations of
the top quark and Higgs particle masses, based on infra-red fixed points and
the so-called multiple point principle respectively, are discussed. We also
consider mass matrix texture and the neutrino mass puzzle.


title: The structure of the Troika: Proton, Photon and Pomeron, as seen at HERA

abstract:
  HERA, the electron-proton collider, enables to probe the proton with a high
resolving power due to the deep inelastic scattering reactions at high $Q^2$
values. In the low $Q^2$ region, one can study the properties of the photon.
The large fraction of diffractive events found both in the low and high $Q^2$
region allows the study of the Pomeron. A review of what we have learned from
HERA so far about the structure of these three objects is presented.


title: Atmospheric and Solar Neutrino Oscillations in \nuMSSM and Beyond

abstract:
  We show how a unified description of the various two-flavor neutrino
oscillation solutions, allowed by the atmospheric and solar neutrino
experiments, are naturally realized within the framework of $\nu$MSSM (MSSM
augmented with the seesaw mechanism) and beyond, especially grand unified
theories. A general mechanism for achieving maximal mixing to resolve the
atmospheric anomaly is discussed, and applied to the flipped SU(5) model.
Except in the case of MSSM and SU(5), a light sterile neutrino is an inevitable
consequence of our considerations. The bi-maximal neutrino mixing scenario is
one of the options considered. Neutrino hot dark matter can arise in models
with maximal $\nu_{\mu}-\nu_s$ oscillations. A ${\cal U}(1)$ flavor symmetry,
motivated by the charged fermion mass hierarchies and the magnitudes of the CKM
matrix elements, plays a central role.


title: Heavy quark mass effects in e^+e^- into three jets

abstract:
  Next-to-leading order calculation for three jet heavy quark production in
e^+e^- collisions, including complete quark mass effects, is reviewed. Its
applications at LEP/SLC are also discussed.


title:
NLO calculations of the three-jet heavy quark production in
  e^+e^--annihilation: status and applications

abstract:
  Next-to-leading order calculations for heavy quark three-jet production in
e+e- annihilation are reviewed. Their applications for the measurement of the
b-quark mass at LEP/SLC and for the test of flavour independence of the strong
coupling constant are discussed.


title: Decoupling relations, effective Lagrangians and low-energy theorems

abstract:
  If QCD is renormalized by minimal subtraction (MS), at higher orders, the
strong coupling constant alpha_s and the quark masses m_q exhibit
discontinuities at the flavour thresholds, which are controlled by so-called
decoupling constants, zeta_g and zeta_m, respectively. Adopting the modified MS
(MS-bar) scheme, we derive simple formulae which reduce the calculation of
zeta_g and zeta_m to the solution of vacuum integrals. This allows us to
evaluate zeta_g and zeta_m through three loops. We also establish low-energy
theorems, valid to all orders, which relate the effective couplings of the
Higgs boson to gluons and light quarks, due to the virtual presence of a heavy
quark h, to the logarithmic derivatives w.r.t. m_h of zeta_g and zeta_m,
respectively. We also consider the effective QCD interaction of a CP-odd Higgs
boson and verify the Adler-Bardeen nonrenormalization theorem at three loops.


title: Recent developments in the study of unstable particle processes

abstract:
  Developments in the analysis of W and quark propagators in the resonance
region, and recent considerations concerning the mass and width of the Higgs
boson are reviewed. Particular emphasis is placed on the instability of these
fundamental particles, and on related issues of gauge dependence.


title: Heavy Flavour Production

abstract:
  I review recent developements in the theory of heavy flavour production. In
particular, I dicuss the next-to-leading resummation of soft gluon effects in
heavy flavour hadroproduction, and the next-to-leading resummation of collinear
radiation in the production of heavy flavour at large transverse momenta.


title:
TFT98: Proceedings of the 5th International Workshop on Thermal Field
  Theories and Their Applications

abstract:
  This contains the Proceedings of the 5th International Workshop on Thermal
Field Theories and Their Applications (TFT98) which took place on 10-14 August
1998 in Regensburg, Germany. The contents are in html and postscript format.
The html files contain clickable links to the postscript files of the papers on
the LANL e-print archive. All contributions underwent strict peer review before
being accepted for this volume. Comments and suggestions for improvements
should be sent to ulrich.heinz@cern.ch.

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


title: Fermion Mixing Renormalization and Gauge Invariance

abstract:
  We study the renormalization of the fermion mixing matrix in the Standard
Model and derive the constraints that must be satisfied to respect gauge
invariance to all orders. We demonstrate that the prescription based on the
{\it on-shell} renormalization conditions is not consistent with the
Ward-Takahashi Identities and leads to gauge dependent physical amplitudes. A
simple scheme is proposed that satisfies all theoretical requirements and is
very convenient for practical calculations.


title:
Upper Bounds on $K \to \pi \nu \bar \nu$ and $K_L \to \pi^0 e^+ e^-$
  from $\epsilon^\prime/\epsilon$ and $K_L \to \mu^+ \mu^-$

abstract:
  We analyze rare kaon decays in models in which the dominant new effect is an
enhanced $\bar s d Z$ vertex $Z_{ds}$. We point out that in spite of large
theoretical uncertainties the CP-violating ratio $\epsilon^\prime/\epsilon$
provides at present the strongest constraint on $\Im Z_{ds}$. Assuming $0 \le
\epsilon^\prime/\epsilon \le 2 \cdot 10^{-3}$ and Standard Model values for the
CKM parameters we obtain the bounds ${\rm BR}(K_L \to \pi^0 \nu \bar \nu) \le
2.4 \cdot 10^{-10}$ and ${\rm BR}(K_L \to \pi^0 e^+ e^-) \le 3.6 \cdot
10^{-11}$ (which are substantially stronger than the bounds found recently by
Colangelo and Isidori, using $\epsilon$ instead of $\epsilon^\prime/\epsilon$).
We illustrate how these bounds can be improved with the help of the forthcoming
data on $\epsilon^\prime/\epsilon$. Using the bound on $\Re Z_{ds}$ from $K_L
\to \mu^+ \mu^-$ we find ${\rm BR}(K^+ \to \pi^+ \nu \bar \nu) \le 2.3 \cdot
10^{-10}$. In this context we derive an analytic upper bound on ${\rm BR}(K^+
\to \pi^+ \nu \bar \nu)$ as a function of ${\rm BR}(K_L \to \pi^0 \nu \bar
\nu)$ and the short distance contribution to ${\rm BR}(K_L \to \mu^+ \mu^-)$.
We also discuss new physics scenarios in which in addition to an enhanced $\bar
s d Z$ vertex also neutral meson mixing receives important new contributions.
In this case larger values of the branching ratios in question cannot be
excluded.


title: The $\Delta I=1/2$ Rule in the Chiral Limit

abstract:
  We discuss the matching between long-distance and short-distance at
next-to-leading in $1/N_c$ and show how the scheme-dependence from the two-loop
renormalization group running can be treated. We then use this method to study
the three $O(p^2)$ terms contributing to non-leptonic kaon decays, namely the
usual octet and 27-plet derivative terms as well as the weak mass term using
the Extended Nambu--Jona-Lasinio model as the low energy approximation. We also
discuss subtleties in the momentum routing in the low energy theory and a
problem in separating factorizable and non-factorizable contributions from the
$Q_6$ operator in the chiral limit. We update our earlier results on the $B_K$
parameter as well.


title: Continuity of Quark and Hadron Matter

abstract:
  We review, clarify, and extend the notion of color-flavor locking. We present
evidence that for three degenerate flavors the qualitative features of the
color-flavor locked state, reliably predicted for high density, match the
expected features of hadronic matter at low density. This provides, in
particular, a controlled, weak-coupling realization of confinement and chiral
symmetry breaking in this (slight) idealization of QCD.


title: $s\bar{s}$ dominance of the $f_0$(980) meson

abstract:
  We prove that recent data demonstrates unequivocally that the scalar meson
$f_0$(980) is mostly composed of $s\bar{s}$ quarks and that the coupling of
$f_0$ to photons and mesons is in agreement with the linear sigma model.


title:
Determination of HQET parameter \lambda_1 from Inclusive Semileptonic B
  Meson Decay Spectrum

abstract:
  We estimate the heavy quark effective theory parameter \lambda_1 from
inclusive semileptonic B-meson decay spectrum. By using recent CLEO double
lepton tagging data of B -> X e nu, which shows the lepton momentum as low as
0.6 GeV, we extracted \lambda_1 \sim -0.58 GeV^2. We also derived \bar\Lambda
\sim 0.46 GeV and |V_{cb}| = 0.041 \pm 0.002.


title: Quark deconfinement and meson properties at finite temperature

abstract:
  A simple confining separable interaction Ansatz for the rainbow-ladder
truncated QCD Dyson-Schwinger equations is used to study quark deconfinement
and meson states at finite temperature. The model is fixed at T=0 to implement
quark confinement while preserving the Goldstone mechanism for the $\pi$.
Within the Matsubara formalism, a very slow temperature dependence is found for
the $\pi$ and $\rho$ meson masses $M_H(T)$ until near the deconfinement
temperature $T_c=143$ MeV. Related to rapid decrease of the
dynamically-generated quark mass function for $T>T_c$, this model produces
$\pi$ and $\rho$ masses that rise significantly and are better interpreted as
spatial screening masses. The $T$-dependent screening mass defect $\Delta M_H =
2\pi T-M_H(T)$ is compared to results of lattice gauge theory simulations and
also to those of an infrared dominant analytic model.


title:
Majorana neutrino transition magnetic moments in left-right symmetric
  models

abstract:
  Transition magnetic moments of Majorana neutrinos are discussed in the frame
of the most natural version of the LR model (with left- and right-handed
triplets and a bidoublet in the Higgs sector). We show that their largest
values could be at most $6\cdot 10^{-13} \mu_B$ from diagrams with $W_L$ in the
loop. This could happen for specific models where (i) neutrino-charged lepton
mixing is maximal and (ii) $\kappa_1 \simeq \kappa_2$ (VEVs for neutral Higgs
fields in the bidoublet $\phi$ are equal). Contributions from diagrams with
charged Higgses in the loop are smaller than those in the SM with right-handed
neutrinos.


title: Effects of Perturbative Colour Interference on WW -> 6-jet Distributions

abstract:
  At LEP II it is hoped to measure the W mass to an accuracy of around 40 MeV.
This will require direct reconstruction of the mass of the W from its decay
products in both the semi-leptonic and hadronic decay channels. Final state
perturbative reconnection effects in hadronic decays are considered and their
effect on 6-jet distributions and the reconstructed mass. The perturbative mass
shift is found to be ~ 50 keV in the negative direction.


title: Gravitino constraints on models of neutrino masses and leptogenesis

abstract:
  In the supersymmetric extensions of the standard model, neutrino masses and
leptogenesis requires existence of new particles. We point out that if these
particles with lepton number violating interactions have standard model gauge
interactions, then they may not be created after reheating because of the
gravitino problem. This will rule out all existing models of neutrino masses
and leptogenesis, except the one with right-handed singlet neutrinos.


title: Using Two-jet Events to Understand Hadronization

abstract:
  While the hard phase of the strong interaction is well described by
perturbative QCD, the soft hadronization phase is less understood. Benefiting
from the high statistics from e+e- experiments at the Z0 resonance, it is
possible to impose strong two-jet cuts on the data without loosing the
statistical significance. In these events perturbative activity is suppressed
and hadronization effects can be more prominent. We show that after proper
event cuts a set of observables are sensitive to differences in the
hadronization models. These observables can thus be important tools for a more
detailed study of the hadronization mechanism.


title:
Radiative corrections to pair production of unstable particles: results
  for e^+e^- --> 4 fermions

abstract:
  Radiative corrections to processes that involve the production and subsequent
decay of unstable particles are complex due to various theoretical and
practical problems. The so-called double-pole approximation offers a way out of
these problems. This method is applied to the reaction $e^{+}e^{-} \to
W^{+}W^{-} \to 4 $fermions, which allows us to address all the key issues of
dealing with unstable particles, like gauge invariance, interactions between
different stages of the reaction, and overlapping resonances. Within the
double-pole approximation the complete $\OO(\alpha)$ electroweak corrections
are evaluated for this off-shell $W$-pair production process. Examples of the
effect of these corrections on a number of distributions are presented. These
comprise mass and angular distributions as well as the photon-energy spectrum.


title: Polarized top decay into polarized W: t(up)->W(up) + b at O(alpha_s)

abstract:
  We consider the decay of a polarized top quark into a polarized W-boson plus
a bottom quark, followed by the decay of the W-boson into a pair of leptons or
quarks. The polar angle distribution of the top spin relative to the W-momentum
and the polar angle distribution of the lepton (or quark) in the W-rest frame
is governed by three polarized and three unpolarized rate functions which are
related to the double density matrix elements of the decay $t \to W^+ + b$. We
obtain analytical expressions for the $O(\alpha_s)$ radiative corrections to
the three polarized and three unpolarized rate functions. We also provide a
comprehensive discussion of the dependence of the longitudinal, transverse and
normal polarization of the top quarks produced at $e^+e^-$-colliders on beam
polarization parameters.


title: Nucleon form factors in a chiral constituent-quark model

abstract:
  The electromagnetic form factors of the nucleon have been calculated in a
chiral constituent-quark model. The nucleon wave functions are obtained by
solving a Schr\"odinger-type equation for a semi-relativistic Hamiltonian with
an effective interaction derived from the exchange of mesons belonging to the
pseudoscalar octet and singlet and a linear confinement potential. The
charge-density current operator has been constructed consistently with the
model Hamiltonian in order to preserve gauge invariance and to satisfy the
continuity equation.


title: Implications of N=1 supersymmetry for QCD conformal operators

abstract:
  We prove a set of identities for the anomalous dimensions of the quark and
gluon conformal operators in the flavour singlet channel in QCD. These
relations arise from the graded commutator algebra of the N=1 superconformal
group. We evaluate the rotation matrices for the quantities under study from
the conventional dimensional regularization to the supersymmetry preserving
regularization scheme. Using them we verify the equalities in two-loop
approximation employing the results for the NLO anomalous dimensions of the
conformal operators in the minimal subtraction scheme derived earlier.


title: Electroweak Baryogenesis by Black Holes

abstract:
  We propose a new scenario of the electroweak baryogenesis based on the
properties of electroweak domain walls surrounding black holes in the Higgs
phase vacuum of the extended Standard Model with 2-Higgs doublets. It is shown
that there exists the electroweak domain walls and the symmetric regions
surrounding black holes and that the Hawking radiation of the black holes can
produce a non-zero baryon number density. The scenario can explain the origin
of the baryon number in our universe even without the assumption of the
existence of the first order electroweak phase transition.


title: Rotating string

abstract:
  The qualitative results for string rotation in the frame of Relativistic Flux
Tube Model and the quantitative and qualitative results for decay of massive
open string states of string theory are used as the basic principles in the
Monte Carlo implementation for decay of massive open string. The presented
model can be used as an ingredient into any Monte Carlo model of multiparticle
production for different types of collising particles. In the interval of total
c.m. energy from 3 GeV (e^+e^- annihilation) to 1800 GeV (proton-antiproton
interaction) the presented "soft" (i.e. withaut $qq, gg, qg$ scattering) model
has agreement with experimental data on transverse momentum distribution of
secondary particles up to 4 GeV. According to widely known theoretical
hypothesis, the secondary particles from interval $p_{T} > $1GeV are results of
hard scattering QCD states. Therefore (maybe) one can recover a question about
relation between the classical string solutions of string theory and solutions
of QCD equations.


title:
Quantum Analysis of Rydberg Atom Cavity Detector for Dark Matter Axion
  Search

abstract:
  Quantum analysis is made on the dynamical system consisting of the cosmic
axions, photons and Rydberg atoms which are interacting in the resonant cavity.
The atomic motion in a continuous incident beam is taken into account properly
in order to make a precise estimate of the efficiency of the Rydberg atom
cavity detector for dark matter axion search.


title: Comments on the Sign of CP Asymmetries

abstract:
  Several experiments are about to measure the CP asymmetry for $B \to \psi
K_S$ and other decays. The standard model together with the Kobayashi-Maskawa
ansatz for CP violation predicts the sign as well as the magnitude for this
asymmetry. In this note we elucidate the physics and conventions which lead to
the prediction for the sign of the asymmetry.


title: Trilepton Signature of Minimal Supergravity at the Upgraded Tevatron

abstract:
  The prospects for detecting trilepton events ($\ell = e$ or $\mu$) from
chargino-neutralino ($\chi^\pm_1 \chi^0_2$) associated production are
investigated for the upgraded Fermilab Tevatron Collider in the context of the
minimal supergravity model (mSUGRA). In some regions of parameter space,
$\chi^\pm_1$ and $\chi^0_2$ decay dominantly into final states with $\tau$
leptons and the contributions from $\tau-$leptonic decays enhance the trilepton
signal substantially when soft cuts on lepton transverse momenta are used.
Additional sources of the mSUGRA trilepton signal and dominant irreducible
backgrounds are discussed. The dilepton ($\ell^+\ell^-$) invariant mass
distribution near the endpoint is considered as a test of mSUGRA mass
relations. Discovery contours for $p\bar{p} \to 3\ell +X$ at 2 TeV with an
integrated luminosity of 2 fb$^{-1}$ to 30 fb$^{-1}$ are presented in the
mSUGRA parameter space of $(m_0,m_{1/2})$ for several choices of $\tan\beta$.


title: Grand Unified Theories and Lepton-Flavour Violation

abstract:
  Lepton-flavour violating processes, such as $\mu \to e\gamma$, are studied in
ordinary (non-SUSY) SU(5) and SUSY SU(5) grand unified theories. First given
are some introductory argument on the mechanism of U.V. divergence cancellation
in flavour changing neutral current processes and on the decoupling of
particles with GUT scale masses . We next see that such general argument is
confirmed by an explicit calculation of the amplitude of $\mu \to e\gamma$ in
ordinary SU(5), which shows that logarithmic divergence really cancels among
diagrams and remaining finite part are suppressed by at least $1/M_{GUT}^2$. In
SUSY SU(5), flavour changing slepton mass-squared term get a logarithmic
correction, as recently claimed. However, when the effect of flavour changing
wave function renormalization is also taken into account such logarithmic
correction turns out to disappear, provided a condition is met among SUSY
breaking soft masses. In SUGRA-inspired SUSY GUT, such condition is not
satisfied. But the remaining logarithmic effect is argued not to be taken as a
prediction of the theory associated with an irrelevant operator. We find that
the log-correction should not exist in models with gauge mediated SUSY
breaking.


title: Large-Nc QCD and Spontaneous Chiral Symmetry Breaking

abstract:
  I report on recent work done in collaboration with M. Knecht on patterns of
spontaneous chiral symmetry breaking in the large-Nc limit of QCD-like
theories, and with S. Peris and M. Perrottet concerning the question of
matching long and short distances in large-Nc QCD.


title:
Higgs-Boson Production in Association with Bottom Quarks at
  Next-to-Leading Order

abstract:
  We argue that the leading-order subprocess for Higgs-boson production in
association with bottom quarks is (b\bar{b} -> H). This process is an important
source of Higgs bosons with enhanced Yukawa coupling to bottom quarks. We
calculate the corrections to this cross section at next-to-leading-order in
1/ln(m_H/m_b) and alpha_s and at next-to-next-to-leading order in
1/ln(m_H/m_b).


title: Are the production and decay of a resonance always independent?

abstract:
  The widely accepted assumption that the decay of a resonance proceeds
independently of its production, quantitatively expressed as a factorizing
formula for the differential cross section in the invariant mass of unpolarized
resonance debris, is put under scrutiny. It is shown that the factorization is
always valid for scalar and pseudoscalar resonances, although the usual version
of the formula is not entirely correct. For resonances with nonzero spins the
factorization does not generally take place. We deal in more detail with the
spin-one case, where we show a condition on the decay matrix element that
ensures the validity of the same factorizing formula as in the spinless case.
This condition is satisfied for rho --> pi pi but not, e.g., for K* --> pi K or
a1 --> pi rho. The formalism is applied also to the case when the resonance is
produced not in two-body collisions but in the decay of a heavier particle or
resonance (chain decay). Application of our formulas to the e+e- production in
one-photon approximation agrees with what is known from quantum electrodynamics
and thus provides another test of their soundness.


title:
Production of para-- and orthopositronium at relativistic heavy ion
  colliders

abstract:
  We consider the ortho-- and parapositronium production in the process $AA \to
AA+$ Ps where A is a nucleus with the charge number Z. The inclusive cross
section and the energy distribution of the relativistic Ps are calculated which
are of primary interest from the experimental point of view. The accuracy of
the corresponding cross sections is given by omitting terms $\sim (Z\alpha
)^2/L^2$ for the para--Ps and $\sim (Z\alpha)^2/L$ for the ortho--Ps production
where $L=\ln{\gamma^2} \approx 9$ and 16 for the RHIC and the LHC. Within this
accuracy the multiphoton (Coulomb) corrections are taken into account. We show
that the RHIC and the LHC will be Ps factories with a productions rate of about
$10^5 \div 10^8$ relativistic Ps per day. The fraction of the ortho--Ps is
expected to be of the same order as that of the para--Ps for Au--Au and Pb--Pb
collisions.


title: Quark and Lepton Flavor Mixings in the SU(5) Grand Unification Theory

abstract:
  We explain the imbalance of the flavor mixing angles between the quark and
the lepton sectors in the context of the SU(5) GUT with the see-saw mechanism.
The quark masses and the CKM matrix elements are obtained by using,
respectively, the Fritzsch and Branco - Silva-Marcos form for the up- and
down-quark Yukawa matrices (y^u and y^d) at the GUT scale. The charged-lepton
Yukawa matrix (y^e) is the transpose of y^d, modified by the Georgi-Jarlskog
factor. We show that the neutrino masses and mixing angles suggested by the
recent solar and atmospheric neutrinos are then obtained from a simple texture
of the neutrino Yukawa matrix (y^\nu) and a diagonal right-handed Majorana mass
matrix at the GUT scale.


title:
Eikonal profile functions and amplitudes for $\rm pp$ and $\bar{\rm
  p}{\rm p}$ scattering

abstract:
  The eikonal profile function $J(b)$ obtained from the Model of the Stochastic
Vacuum is parametrized in a form suitable for comparison with experiment. The
amplitude and the extended profile function (including imaginary and real
parts) are determined directly from the complete pp and $\bar{\rm p}$p elastic
scattering data at high energies. Full and accurate representation of the data
is presented, with smooth energy dependence of all parameters. The changes
needed in the original profile function required for description of scattering
beyond the forward direction are described.


title: Meson Cloud, QCD Nucleon Correlator and Chiral Perturbation Theory

abstract:
  We introduce a model for nucleons with correlators that include the
propagation of pseudo Goldstone bosons as well as the standard correlators for
nucleons used in QCD sum rules. From the comparison with experimental nucleon
magnetic dipole moments we estimate the probability of a pion cloud in a
nucleon. The masses obtained from the sum rules are almost independent of the
cloud contributions. We show that the model is consistent with chiral
perturbation theory, and solves a long-standing problem on obtaining the
leading non-analytic correction to the nucleon mass in QCD sum rules.


title: Supersymmetry without R-parity : Constraints from Leptonic Phenomenology

abstract:
  R-parity conservation is an {\it ad hoc} assumption in the most popular
version of the supersymmetric standard model. Most studies of models which do
allow for R-parity violation have been restricted to various limiting
scenarios. The single-VEV parametrization used in this paper provides a
workable framework to analyze phenomenology of the most general theory of SUSY
without R-parity. We perform a comprehensive study of leptonic phenomenology at
tree-level. Experimental constraints on various processes are studied
individually and then combined to yield regions of admissible parameter space.
In particular, we show that large R-parity violating bilinear couplings are not
ruled out, especially for large $\tan\beta$.


title:
Could the $\tau$ be substantially different from $e$ and $\mu$ in the
  supersymmetric standard model?

abstract:
  R-parity stands as an ad hoc assumption in the most popular version of the
supersymmetric standard model. More than fifteen years' studies of R-parity
violations have been restricted to various limiting scenarios. We illustrate
how the single-VEV parametrization provides a workable framework to analyze the
phenomenology of the complete theory of supersymmetry without R-parity. In our
comprehensive study of various aspects of the resulting leptonic phenomenology
at tree-level, we find that the physical $\tau$ lepton could actually bear
substantial gaugino and higgsino components, making it very different from the
$e$ and the $\mu$.


title: R-parity-violating trilinear couplings and recent neutrino data

abstract:
  The nontrivial structure of the neutrino mass matrix, suggested by the recent
Super-Kamiokande results and data from other neutrino experiments, can be
reproduced in R-parity-violating supersymmetric theories. This requires sets of
products of R-parity-violating trilinear couplings to take appropriately chosen
values. It is shown that the existing constraints on these couplings are
satisfied by these choices.


title: Getting to the top with extra dimensions

abstract:
  The prospect of large extra dimensions and an effective theory of gravity at
around a TeV has interesting experimental consequences. In these models, the
Kaluza-Klein modes interact with Standard Model particles and these
interactions lead to testable predictions at present and planned colliders. We
investigate the effect of virtual exchanges of the spin-2 Kaluza-Klein modes in
the production cross-section of $t \bar t$ pairs at the Tevatron and the LHC
and find that the $t \bar t$ cross-section can be an effective probe of the
large extra dimensions. This enables us to put bounds on the effective
low-energy scale.


title: SUSY Phenomenology

abstract:
  Three topics on phenomenology in supersymmetric models are reviewed, namely,
the Higgs sector in the supersymmetric model, B and K meson decay in the
supergravity model and lepton flavor violation processes in supersymmetric
grand unified theory.


title: Two-loop QCD vertices, WST identities and RG quantities

abstract:
  Recent results from the study of the two-loop three-gluon and ghost-gluon
vertices are reviewed. The relevant Ward-Slavnov-Taylor (WST) identities and
Renormalization Group (RG) quantities are discussed.


title: Uncertainty of the atmospheric neutrino fluxes

abstract:
  The uncertainty in the calculation of atmospheric neutrino fluxes is studied.
The absolute value of atmospheric neutrino fluxes is sensitive to variation of
the primary cosmic ray flux model and/or the interaction model. However, the
ratios between different kind of neutrinos stay almost unchanged with these
variations. It is unlikely that the anomalous ratio
$(\nu_{\mu}/\nu_e)_{obs}/(\nu_{\mu}/\nu_e)_{MC}$ reported by Kamiokande and
Super Kamiokande is caused by the uncertainty of predicted atmospheric neutrino
fluxes.


title: Higgs Production: CP Studies in e-e- Collisions

abstract:
  We review the production of scalar Higgs-like particles in high-energy
electron-electron collisions, via the fusion of electroweak gauge bosons. The
emphasis is on how to distinguish a CP-even from a CP-odd Higgs particle. Among
the more significant differences, we find that in the CP-odd case, the Higgs
spectrum is much harder, and the dependence of the total cross section on the
product of the polarizations of the two beams is much stronger, than in the
CP-even case. We also briefly discuss parity violation, and the production of
charged Higgs bosons.


title: Flavor SU(3) in Hadronic B Decays

abstract:
  Here we shall outline a few methods that use the flavor SU(3) symmetry in the
decays of B mesons to determine the angles of the unitarity triangle and to
identify the decay modes which would display a significant CP violation.


title: Quarks and gravitation

abstract: A turnings of the colors quarks mass space make curved the events time-space.


title:
Cabibbo-Kobayashi-Maskawa Matrix, Unitarity Triangle and Geometry Origin
  of the Weak CP Phase

abstract:
  In this work, the postulation that weak CP phase originates in a certain
geometry, is further discussed. According to this postulation, the weak CP
phase is determined by three mixing angles. So, if we can determine
experimentally three elements of the Cabibbo-Kobayashi-Maskawa matrix, we can
then determine the whole CKM matrix and correspondingly, the unitarity
triangle. We find that the angle gamma is about pi/2 and the weak CP phase
delta (delta_{13}) only can exist in the first or fourth quadrant. The
conclusions coincide with the relevant analysis. Some other predictions are
given in this paper, the comparison of the predictions based on the postulation
to the relevant experimental and theoretical results is listed. All the
predictions are consistent with the present experimental results.


title: Axion and Almost Massless Quark as Ingredients of Quintessence

abstract:
  It is pointed out that a natural introduction of quintessence is an axion
with an almost massless quark. With an appropriate gauge or discrete symmetry,
one can obtain the quintessence potential height of order $(0.003 eV)^4$. Even
though the QCD axion with almost massless up quark is a possibility, we stress
the almost massless quark in the hidden sector together with the QCD axion
toward the quintessence.


title: R_F Parity and Almost Massless Up Quark

abstract:
  We introduce a parity $R_F$ to introduce naturally small masses for the first
family members and in particular almost massless $u$ quark toward the strong CP
solution. We also discuss the phenomenological implications of this model on
the proton decay and the neutrino mass. Furthermore, it is possible to embed
this $R_F$ parity to local $U(1)_R$ gauge symmetry.


title:
Ultrarelativistic positronium production in collisions of high energy
  electrons and laser photons

abstract:
  We consider the production of ultrarelativistic parapositronium and
orthopositronium atoms in collisions of high energy electrons with laser
photons. Our results demonstrate the opportunity of intensive positronium beam
formation with Lorentz-factor 10^6 using laser beam conversion on high energy
electrons at the future Electron Linear Accelerators.


title:
On the Coulomb corrections to the total cross section of the interaction
  of the $\pi^+\pi^-$ atom with ordinary atoms at high energy

abstract:
  The size of $\pi^+\pi^-$ atom in the low lying states is considerably smaller
than the radius of atomic screening. Due to that we can neglect this screening
calculating the contribution of multi-photon exchanges. We obtain the analytic
formula for Coulomb corrections which works with a very good accuracy for the
ground state of $\pi^+\pi^-$ atom.


title: The Gauge-Higgs System in Three Dimensions to Two-loop Order

abstract:
  The 3-dimensional gauge-Higgs system describes the non-perturbative infrared
effects of the high-temperature phase of the Standard Model. We calculate the
two-loop self-energies in the 3-dimensional SU(2) Higgs model and in the
corresponding gauged non-linear $\sigma$-model. As an application of the
results, we estimate the dynamically generated vector boson mass in the
symmetric phase of the Higgs model by means of gap equations.


title: Proton polarizability correction to the hydrogen hyperfine splitting

abstract:
  The contribution of \Delta isobar to the correction on proton polarizability
in the hyperfine splitting of hydrogen and muonic hydrogen is calculated with
the account of the experimental data on N-\Delta transition form factors.


title: Precise strength of th piNN coupling constant

abstract:
  We report here a preliminary value for the piNN coupling constant deduced
from the GMO sumrule for forward piN scattering. As in our previous
determination from np backward differential scattering cross sections we give a
critical discussion of the analysis with careful attention not only to the
statistical, but also to the systematic uncertainties. Our preliminary
evaluation gives $g^2_c$(GMO) = 13.99(24).


title:
Scaling Behaviour of Tensor Analysing Power (Ayy) in the Inelastic
  Scattering of Relativistic Deuterons

abstract:
  We suggested a dimensionless relativistic invariant variable (R) which may be
interpreted as a ratio of the excitation energy to the full transferred energy;
therefore this variable measured a "degree of inelasticity" of the scattering.
Existing data on the tensor analysing power of p(d,d')X and 12C(d,d')X
inelastic scattering at momenta from 4.2 to 9 GeV/c are analysed in terms of
this variable. We observe that Ayy taken as function of R does not depend upon
the incident energy, the scattering angle (up to 30 deg. in CM frame); there is
no noticeable difference between the proton and carbon targets as well. It is
remarkable that Ayy is maximal when R near to 0.5-0.6 and small in absolute
value when R is close to its limiting values of 0 and 1.


title:
Phase Transitions in the Early Universe (Is there a Strongly First Order
  Electroweak Phase Transition?)

abstract:
  After some introductory remarks about the prospects of first order phase
transitions in the early universe, we discuss in some detail the electroweak
phase transition. In the standard model case a clear picture is arising
including perturbative and nonperturbative effects. Since in this case the
phase transition is not strongly first order as needed for baryogenesis, we
discuss supersymmetric variants of the standard model, the MSSM with a light
stop$_R$ and a NMSSM model where this can be achieved. We conclude with some
remarks about the technical procedure and about possible effects of a strongly
first order electroweak phase transition including baryogenesis.


title:
Identification of the glueballs and the scalar meson nonet of lowest
  mass

abstract:
  We discuss the theoretical expectations and phenomenological evidence for the
lightest glueballs and the members of the meson nonet with quantum numbers
J^PC=0^{++}. We reconsider the recent evidence for candidate states with masses
below ~1700 MeV, but include also the results from earlier phase-shift
analyses. Arguments are presented to classify the scalars f_0(980) and
f_0(1500) as members of the 0^{++} nonet, with a mixing rather similar to that
of the pseudoscalars eta' and eta. The S-wave states called f_0(400-1200) and
f_0(1370) are considered as different signals from a single broad resonance,
which we take to be the lowest-lying 0^{++} glueball. This state together with
eta(1440) and f_J(1710) with spin J=2 form the basic triplet of binary gluonic
bound states. We argue that these hypotheses are consistent with what can be
expected theoretically.


title: Less Singular Terms and Small x Evolution in a Soluble Model

abstract:
  We calculate the effect of the less singular terms at small x on the
evolution of the coefficient function in \phi^3 theory in six dimensions, which
result from a complete solution of the ladder equation. Scale-invariant
next-to-leading order contributions are also studied. We show that the small x
approximation does not deliver the dominant contributions.


title: Patterns from preheating

abstract:
  The formation of regular patterns is a well-known phenomenon in condensed
matter physics. Systems that exhibit pattern formation are typically driven and
dissipative with pattern formation occurring in the weakly non-linear regime
and sometimes even in more strongly non-linear regions of parameter space. In
the early universe, parametric resonance can drive explosive particle
production called preheating. The fields that are populated then decay quantum
mechanically if their particles are unstable. Thus, during preheating, a
driven-dissipative system exists. In this paper, we show that a self-coupled
inflaton oscillating in its potential at the end of inflation can exhibit
pattern formation.


title:
Production of a Single and a Pair of Heavy-Exotic-Leptons Through the pp
  Collisions

abstract:
  We investigate the production and signatures of a single, pair of
heavy-exotic leptons via the electron-positron induced process and a pair of
heavy exotic leptons via the Drell-Yan process at the CERN Large Hadron
Collider (LHC). We show that the cross-section for the case of the production
of heavy pair exotic leptons are competitive with the ones for the single
production of exotic leptons. We also exhibit some kinematical distributions.


title: Neutrino and Parity Violation in Weak Interaction

abstract:
  It is shown that neutrino oscillation and Majorana type neutrino are not
compatible with Special Theory of Relativity. Instead of the Majorana type
neutrino, traditional neutrino(no rest mass) is considered with additional
assumptions that right-handed neutrino and left-handed antineutrino exist in
nature and naturally thus parity is conserved. Besides, neutrino itself is
considered as longitudinal vacuum-string oscillations. To explain parity
conservation, W+(W-) bosons are suggested as momentary interacting states
between positron (electron) and virtual-positive(negative)-charge strings,
respectively. With these postulations, an alternative explanation is also
suggested for solar neutrino problem.


title:
Supersymmetric Higgs Bosons Discovery Potential at Hadron Colliders
  through $bg$ channel

abstract:
  We explore the discovery potential of the supersymmetric Higgs bosons through
$bg$ channel at Tevatron and LHC. Compared with the process of $qq' \to WH$,
this channel is more advantigeous to finding the supersymmetric Higgs bosons at
Tevatron if $\tan\beta$ is larger than ten.