title: Nonlinear evolution in high-density QCD

abstract:
  We consider deeply inelastic scattering at very high energies in the
saturation regime. The emerging picture corresponds to the propagation of a
dipole, the quark-antiquark pair, in a shock wave color field of the target. We
use the fomalism of Wilson lines to study the evolution of dipole densities in
energy logarithms. Our analysis results into an equation in multicolor limit
which sums leading logs but keeps the nonlinearities up to cubic order in
densities.


title: Extraction of a Weak Phase from $B \to D^{(*)} \pi$

abstract:
  To observe CP-violating asymmetries through the interference of a weaker
amplitude with a stronger one in $\bo \to D^{(*)} \pi$ and $\ob \to D^{(*)}
\pi$ decays, one must collect enough events that the intensity associated with
the weaker amplitude would be statistically significant. We show that provided
the weaker amplitude is measured separately in $B^\pm \to D^{(*)\pm} \pi^0$
decays, the time-integrated approach requires around $2.5 \cdot 10^8 \ B \bar
B$ pairs for measurements of the weak phase $\sin(2\beta + \gamma)$ with an
uncertainty of $0.05$ or better. We also determine the optimal conditions for
precise $2\beta + \gamma$ measurements and discuss the possibilities for
resolving a discrete ambiguity.


title: Hadronic Regge Trajectories in the Resonance Energy Region

abstract:
  Nonlinearity of hadronic Regge trajectories in the resonance energy region
has been proved.


title: Big bang nucleosynthesis constraints on bulk neutrinos

abstract:
  We examine the constraints imposed by the requirement of successful big bang
nucleosynthesis on models with one large extra dimension and a single bulk
neutrino. We solve the Boltzman kinetic equations for the thermal distribution
of bulk neutrino modes and evaluate their contribution to the energy density of
the universe at the BBN epoch. This helps us to constrain the size of the extra
dimensions and the mixing parameter between the active and bulk neutrinos.


title: Non-perturbative gluons in diffractive photo-production of J/Psi

abstract:
  The modifications induced in the calculation of the cross section of the
diffractive process gamma gamma -> J/Psi J/Psi when the gluon propagator is
changed are analyzed. Instead of the usual perturbative gluon propagator,
alternative forms obtained using non-perturbative methods like Dyson-Schwinger
equations are used to consider in a more consistent way the contributions of
the infrared region. The result shows a reduction in the differential
cross-section for low momentum transfer once compared with the perturbative
result, to be confirmed with future experimental results from TESLA.


title: Black hole production and Large Extra Dimensions

abstract:
  Black hole (BH) production at colliders is possible when the colliding energy
is above the Planck scale, which can effectively be at TeV scale in models of
large extra dimensions. In this work, we study the production of black holes at
colliders and discuss the possible signatures. We point out the ``$ij\to {\rm
BH}+ $ others'' subprocesses, in which the BH and other SM particles are
produced with a large transverse momentum. When the BH decays, it gives a
signature that consists of particles of high multiplicity in a boosted
spherical shape on one side of the event and a few number of high $p_T$ partons
on the other side, which provide very useful tags for the event.


title: Grand Unified Models on $S_1/(Z_2 \times Z_2')$ Orbifold

abstract:
  We suggest two grand unified models where the fifth dimensional coordinate is
compactified on an $S_1/(Z_2 \times Z_2')$ orbifold.


title: Measuring Cosmic Defect Correlations in Liquid Crystals

abstract:
  From the theory of topological defect formation proposed for the early
universe, the so called Kibble mechanism, it follows that the density
correlation functions of defects and anti-defects in a given system should be
completely determined in terms of a single length scale $\xi$, the relevant
domain size. Thus, when lengths are expressed in units of $\xi$, these
distributions should show universal behavior, depending only on the symmetry of
the order parameter, and space dimensions. We have verified this prediction by
analyzing the distributions of defects/anti-defects formed in the
isotropic-nematic phase transition in a thin layer of nematic liquid crystals.
Our experimental results confirm this prediction and are in reasonable
agreement with the results of numerical simulations.


title: In Quest of Neutrino Masses at ${\cal{O}}$(eV) Scale

abstract:
  Neutrino oscillation and tritium beta decay experiments taken simultaneously
into account are able to access the so far imperceptible absolute neutrino
masses at the electronvolt level. The neutrino mass spectrum derived in this
way is independent of the nature of neutrinos (Dirac or Majorana). Furthermore,
the lack of neutrinoless double beta decay gives additional constraints on the
Majorana neutrino mass spectrum. A case of three neutrinos is examined.
Influence of different solutions to the solar neutrino deficit problem on the
results is discussed. Apart from the present situation, four qualitatively
distinct experimental situations which are possible in the future are
investigated: when the two decay experiments give only upper bounds on
effective neutrino masses, when either one of them gives a positive result, and
when both give positive results. The discussion is carried out by taking into
account the present experimental errors of relevant neutrino parameters as well
as their much more precise expected estimations (e.g. by $\nu$ factories). It
is shown in which cases the upgraded decay experiments simultaneously with
neutrino oscillation data may be able to fix the absolute scale of the neutrino
mass spectrum, answer the question of the neutrino nature and put some light on
CP phases in the lepton sector.


title: Main Injector LCW (Low Conductivity Water) Control System

abstract:
  There are six service buildings uniformly spaced along the perimeter of
  MI (Main Injector). A total of 18 LCW pumps were installed around the MI ring
with 3 pumps per building. Approximately 8,000 GPM of LCW is required to cool
magnets, bus and power supplies in the MI enclosure and service buildings. In
each service building, a PLC control system controls pumps and valves, and it
monitors pressures, flow, resistivities and temperatures. The PLC hardware
system consists of a Gateway module and a variety of I/O modules, which are
made by Sixnet of Clifton Park, NY. The control system communicates with other
buildings including MCR (Main Control Room) via an Ethernet link and front-end
computers. For more details of the MI LCW control system, refer to [1] and [2].
One of the key elements of the PLC software is called ISaGRAF workbench, which
was created by CJ International of Seyssins, France. The workbench provides a
comprehensive control-programming environment, where control programs can be
written in five different languages. For more details of ISaGRAF, refer to [3].


title: Highlights of the SLD Physics Program at the SLAC Linear Collider

abstract:
  Starting in 1989, and continuing through the 1990s, high-energy physics
witnessed a flowering of precision measurements in general and tests of the
standard model in particular, led by e+e- collider experiments operating at the
Z0 resonance. Key contributions to this work came from the SLD collaboration at
the SLAC Linear Collider. By exploiting the unique capabilities of this
pioneering accelerator and the SLD detector, including a polarized electron
beam, exceptionally small beam dimensions, and a CCD pixel vertex detector, SLD
produced a broad array of electroweak, heavy-flavor, and QCD measurements. Many
of these results are one of a kind or represent the world's standard in
precision. This article reviews the highlights of the SLD physics program, with
an eye toward associated advances in experimental technique, and the
contribution of these measurements to our dramatically improved present
understanding of the standard model and its possible extensions.


title: A Simple Derivation of the JIMWLK Equation

abstract:
  A simple derivation of the Jalilian-Marian, Iancu, McLerran, Weigert,
Leonidov and Kovner (JIMWLK) equation for the evolution of small-x QCD
wavefunctions is given. The derivation makes use of the equivalence between the
evolution of a (in general complicated) small-x wavefunction with that of the
evolution of the (simple) dipole probing the wavefunction in a high energy
scattering.


title:
Analytic parametrizations of the non-perturbative Pomeron and
  QCD-inspired models

abstract:
  We consider several classes of analytic parametrizations of hadronic
scattering amplitudes, and compare their predictions to all available forward
data (proton- proton, antiproton-proton, pion-proton, kaon-proton,
photon-proton, photon- photon, sigma-proton). Although these parametrizations
are very close for energy larger than 9 GeV, it turns out that they differ
markedly at low energy, where a universal Pomeron term ~(ln s)**2 enables one
to extend the fit down to 4 GeV.


title: Unquenched calculation of alpha_s from Green functions: progress report

abstract:
  We present preliminary results on the computation of the QCD running coupling
constant in the MOM_tilde scheme and Landau gauge with two flavours of
dynamical Wilson quarks. Gluon momenta range up to about 7 GeV (beta=5.6, 5.8
and 6.0) with a constant dynamical quark mass. This range already allows to
exhibit some evidence for a sizeable 1/mu^2 correction to the asymptotic
behaviour, as in the quenched approximation. We find Lambda_MS^(N_f=2) =
264(27) MeV x [a^{-1}(5.6,0.1560)/(2.19 GeV)], which leads to alpha_s(M_Z) =
0.113(3)(4). In view of the systematics error to be controlled, this
encouraging result is more a preliminary indication than a real prediction.


title: Power Corrections to Perturbative QCD and OPE in Gluon Green Functions

abstract:
  We show that QCD Green functions in Landau Gauge exhibit sizable $O(1/\mu^2)$
corrections to the expected perturbative behavior at energies as high as 10
GeV. We argue that these are due to a $<A^2>$-condensate which does not vanish
in Landau gauge.


title:
Double Diffractive Higgs and Di-photon Production at the Tevatron and
  LHC

abstract:
  We use the POMWIG Monte Carlo generator to predict the cross-sections for
double diffractive higgs and di-photon production at the Tevatron and LHC. We
find that the higgs production cross-section is too small to be observable at
Tevatron energies, and even at the LHC observation would be difficult. Double
diffractive di-photon production, however, should be observable within one year
of Tevatron Run II.


title: Cosmology with a long range repulsive force

abstract:
  We consider a class of cosmological models in which the universe is filled
with a (non-electric) charge density that repels itself by means of a force
carried by a vector boson with a tiny mass. When the vector's mass depends upon
other fields, the repulsive interaction gives rise to an electromagnetic
barrier which prevents these fields from driving the mass to zero. This can
modify the cosmology dramatically. We present a very simple realization of this
idea in which the vector's mass arises from a scalar field. The electromagnetic
barrier prevents this field from rolling down its potential and thereby leads
to accelerated expansion.


title: CPT and Lorentz Violations in Neutrino Oscillations

abstract:
  Tests of Lorentz invariance violation and CPT Violation in neutrino
oscillations are discussed. The sensitivity of current and future experiments
is presented.


title:
A compilation of total cross section data on e^+ e^- --> hadrons and
  pQCD tests

abstract:
  All available data on the total cross sections and R-ratio of e^+ e^- -->
hadrons are compiled from the PPDS(DataGuide), PPDS(ReacData) and
HEPDATA(Reaction) databases and transformed to a compilation of data on the e^+
e^- --> quark antiquark --> hadrons in the continuum region which can be used
in tests of the parton model and pQCD calculations. This evaluated data
compilation is made available in PPDS system and is accessible through the Web.
It is shown that current predictions from the parton model and pQCD are well
supported by this world "continuum" data compilation which can then be used in
future refinements of the alpha_s(Q^2) as well as alpha_{QED}(Q^2) evolution
forms.


title: Precision testing the Standard Model

abstract:
  Internal consistency of the most sensitive electroweak measurements within
the standard model framework is examined. Confirming an earlier observation on
the separation of Z-pole asymmetry measurements into {\em hadronisation-
free}and {\em hadronisation-sensitive}, the electroweak mixing angle derived
using the former is in perfect agreement with the precision W mass. These two
complimentary measurements of weak radiative corrections, when combined with
the lower limit on Higgs mass, are incompatible with the measured top quark
mass. To overcome this inconsistency, a scenario readily testable in Run-II at
Tevatron is envisaged: an upward shift of the top quark mass by about 10 GeV
($\sim 2\sigma$). If, however, the improved top quark mass remains at its
current value or the lower limit on Higgs mass moves up substantially, then
abandoning the SM may become inevitable.


title: A simple Solution to the Strong CP Problem

abstract:
  We propose a minimal modification of the standard model, remarkable in its
simplicity, which may solve the strong CP problem. It employs three Higgs
doublets with interactions taken to be invariant under a flavor symmetry. Both
CP and the flavor symmetry are softly broken by Higgs boson mass terms. In tree
approximation, quark mass matrices are triangular and arg det M vanishes,
Radiative corrections yield a tiny and tolerable value of theta-bar.


title: Non-Equilibrium Aspects of Chiral Field Theories

abstract:
  First, the chiral phase transition at nonzero temperature and baryon chemical
potential is studied at mean field level in the sigma model that includes quark
degrees of freedom explicitly. For small bare quark masses the critical point
separating the first order phase transition line and the smooth crossover
region is determined, and the spinodal lines are drawn. Adiabatic lines are
computed showing that the critical point does not serve as focusing point in
the adiabatic expansion. Second, coarse-grained evolution equations for
inhomogeneous chiral condensate fields coupled to a heat bath are derived in
the linear sigma model. Multiple effects of the thermal background on the
Disoriented Chiral Condensate (DCC) are studied within linear response theory.
In-medium modification of the pion dispersion relation is examined. The
deviation from the speed of light of the velocity of soft Goldstone modes is
calculated. Decay widths of pions and sigma mesons are computed at nonzero
temperature at one- and two-loop order in perturbation theory. We show that
elastic scattering processes are significant for the dissipation of DCCs in the
phase transition region. Throughout this work we made sure that Goldstone's
Theorem is fulfilled when chiral symmetry is spontaneously broken.


title: Two-particle decays of B_c meson into charmonium states

abstract:
  The factorization of hard and soft contributions into the hadronic decays of
B_c meson at large recoils is explored in order to evaluate the decay rates
into the S, P and D-wave charmonia associated with rho and pi. The constraints
of approach applicability and uncertainties of numerical estimates are
discussed. The mode with the J/psi in the final state is evaluated taking into
account the cascade radiative electromagnetic decays of excited P-wave states,
that enlarges the branching ratio by 20-25%.


title:
Possible Odderon discovery at HERA via charge asymmetry in the
  diffractive pi+pi- production

abstract:
  We discuss how the evasive Odderon signal can be enhanced by final state
interactions. We suggest the charge asymmetry of pion spectra in diffractive
pi+pi- photoproduction as a promising signature of the Odderon exchange.


title: Absorption in a Particle Oscillations

abstract:
  In the framework of field approach with finite time interval the particle
oscillations in a medium are considered. The absorption in a final states do
not lead to dramatic suppression of ab-transitions. Also we touch on the
problem of infrared singularities. The approach under study is infrared-free.
It is shown that "correction" published recently [A.Gal, Phys. Rev. C61 (2000)
028201] is clearly wrong.


title:
Possibility of spontaneous CP violation in the nonminimal supersymmetric
  standard model with two neutral Higgs singlets

abstract:
  A supersymmetric standard model with two Higgs doublets and two Higgs
singlets is investigated if it can accommodate the possibility of spontaneous
CP violation. Assuming the degeneracy of the scalar quark masses of the third
generation, we find that spontaneous CP violation in the Higgs sector is viable
in our model. In the case of spontaneous CP violation, the masses of the
lightest two neutral Higgs bosons are estimated to be 80 and 125 GeV for some
parameter values in our model, which, are consistent with LEP2 data.


title:
Aspects of the Unitarized Soft Multipomeron Approach in DIS and
  Diffraction

abstract:
  We study in detail the main features of the unitarized Regge model (CFKS),
recently proposed to describe the small-$Q^2$ domain. It takes into account a
two-component description with two types of unitarized contributions: one is
the multiple pomeron exchange contribution, interacting with the large dipole
configurations, and the other one consists of a unitarized dipole cross
section, describing the interaction with the small size dipoles. We analyze the
ratio between soft and hard pieces as a function of the virtuality, and also
compare the resulting dipole cross section to that from the saturation model.
Diffraction dissociation is also considered, showing the scaling violations in
diffractive DIS and estimating the corresponding logarithmic slope.


title: QCD string model for hybrid adiabatic potentials

abstract:
  Hybrid adiabatic potentials are considered in the framework of the QCD string
model. The einbein field formalism is applied to obtain the large-distance
behaviour of adiabatic potentials. The calculated excitation curves are shown
to be the result of interplay between potential-type longitudinal and
string-type transverse vibrations. The results are compared with recent lattice
data.


title: Hadronic potentials from effective field theories

abstract:
  We construct the potentials that describe the spectrum and decay of
electromagnetic bound states of hadrons, and are consistent with ChPT. These
potentials satisfy the matching condition which enables one to express the
parameters of the potential through the threshold scattering amplitudes
calculated in ChPT. We further analyze the ambiguity in the choice of the
short-range hadronic potentials, which satisfy this matching condition.


title: Determining the Supernova Direction by its Neutrinos

abstract:
  Supernova neutrinos, which arrive at Earth earlier than light, allow for the
earliest determination of the direction of the supernova. The topic of this
paper is to study how accurately we can determine the supernova direction. We
simulate supernova neutrino events at the SuperKamiokande detector, using a
realistic supernova model and several realistic neutrino oscillation models.
With the results of our simulation, we can restrict the supernova direction to
be within a circle of radius $9^\circ$. In several neutrino oscillation models,
this accuracy is increased to $8^\circ$. We also discuss the influence of an
accident that occurred at the SuperKamiokande detector. After repair of the
detector, using the remaining PMTs, the accuracy becomes about $12^\circ$ for
no oscillation.


title:
Adjoint bulk scalars and supersymmetric unification in the presence of
  extra dimensions

abstract:
  There are several advantages of introducing adjoint superfields at
intermediate energies around $M=10^{13}$ GeV. Such as (i) gauge couplings still
unify (ii) neutrino masses and mixings are produced (iii) primordial lepton
asymmetry can be produced. We point out that if adjoint scalars have bulk
excitations along with gauge bosons whereas fermions and the doublet scalar
live on boundary then N=2 supersymmetric beta functions $\tilde{b_i}$ vanish.
Thus even if extra dimensions open up at an intermediate scale $\mu_0$ and all
N=2 Yang-Mills fields as well as N=2 matter fields in the adjoint
representation propagate in the bulk, still gauge couplings renormalize beyond
$\mu_0$ just like they do in 4-dimensions with adjoint scalars. Consequently
unification is achieved in the presence to extra dimensions, mass scales are
determined uniquely via Renormalization Group Equations(RGE) and unification
scale remains high enough to suppress proton decay. This scenario can be
falsified if we get signatures of extra dimensions at low energy.


title: Neutrinos and their flavor mixing in nuclear astrophysics

abstract:
  In this thesis we explore the implications of neutrino oscillations in the
context of the solar neutrino data, the atmospheric neutrino data and results
from the terrestrial accelerator/reactor neutrino oscillation experiments. We
perform comprehensive $\chi^2$ analysis for the global solar neutrino data
including SNO and present our results for two flavor $\nu_e-\nu_{active}$ and
$\nu_e-\nu_{sterile}$ oscillations. We explore the apparent conflict between
the flat SK spectrum and the non-monotonic energy dependence of the solar
neutrino survival probability inferred from the global data on total rates. We
analyze the SK atmospheric neutrino data in the framework of two and three
generations. For the three-generation analysis we simultaneously take into
account the results of the terrestrial neutrino experiments. We consider the
possibility of unstable neutrinos and explore the viability of this decay model
as a solution to the atmospheric neutrino anomaly. We make quantitative
predictions for the number of events recorded in the water Cerenkov detectors
due a galactic supernova and examine the signatures of neutrino mass and mixing
in the resultant neutrino signal.


title: Heavy quark potential and mass spectra of heavy mesons

abstract:
  The relativistic quark model is presented. The quark-antiquark potential for
the Schroedinger-like equation is constructed with the account of retardation
effects and one-loop radiative corrections. It consists of the one-gluon
exchange part and the confining part which is the mixture of the Lorentz scalar
and Lorentz vector contributions. The latter contains both the Dirac and Pauli
terms. In the v^2/c^2 approximation the mass spectra of heavy quarkonia
(charmonium and bottomonium) are calculated in good agreement with experiment.
In the case of heavy-light mesons (B and D) the light quark is treated
completely relativistically and only the expansion in the inverse heavy quark
mass is used. The mass spectra of the ground and excited states of D, D_s, B,
B_s mesons are calculated. They exhibit some features of the so-called ``level
inversion''. The obtained results are generally in accord with experimental
data. Still there exist some discrepancies between measurements of different
collaborations.


title: Light-Quark Vector Meson Spectroscopy

abstract:
  The current situation for vector meson spectroscopy is outlined, and it is
shown that the data are inconsistent with the generally-accepted model for
meson decay. A possible resolution in terms of exotic mesons is given. Although
this resolves some of the issues, fresh theoretical questions are raised.


title: Decline and Fall of the Standard Model?

abstract:
  Motivations for physics beyond the Standard Model are reviewed, with
particular emphasis on supersymmetry at the TeV scale. Constraints on the
minimal supersymmetric extension of the Standard Model with universal soft
supersymmetry-breaking terms (CMSSM) are discussed. These are also combined
with the supersymmetric interpretation of the anomalous magnetic moment of the
muon. The prospects for observing supersymmetry at accelerators are reviewed
using benchmark scenarios to focus the discussion. Prospects for other
experiments are discussed, including the detection of cold dark matter, mu -> e
gamma and related processes, as well as proton decay.


title: Strangeness-changing scalar form factors

abstract:
  We derive expressions for strangeness-changing scalar form factors, which
incorporate known theoretical constraints both at low and high energies. Their
leading behaviour in the limit of a large number of colours is calculated from
the resonance chiral Lagrangian. A set of short-distance constraints on the
scalar resonance couplings is obtained, imposing the form factors to vanish at
infinite momentum transfer. Making use of previous results on S-wave KPi
scattering [1], and a coupled--channel dispersion-relation analysis, the KPi,
KEta and KEta' scalar form factors are calculated up to 2 GeV. These scalar
form factors are a key ingredient in the determination of the corresponding
scalar spectral function which is important in the extraction of the mass of
the strange quark from QCD sum rules as well as hadronic tau decays.


title: Light quark masses from scalar sum rules

abstract:
  In this work, the mass of the strange quark is calculated from QCD sum rules
for the divergence of the strangeness-changing vector current. The
phenomenological scalar spectral function which enters the sum rule is
determined from our previous work on strangeness-changing scalar form factors
[1]. For the running strange mass in the MS_bar scheme, we find m_s(2 GeV) = 99
+- 16 MeV. Making use of this result and the light-quark mass ratios obtained
from chiral perturbation theory, we are also able to extract the masses of the
lighter quarks m_u and m_d. We then obtain m_u(2 GeV) = 2.9 +- 0.6 MeV and
m_d(2 GeV) = 5.2 +- 0.9 MeV. In addition, we present an updated value for the
light quark condensate.


title: Large-Nc QCD and Low Energy Interactions

abstract:
  This talk reviews recent progress in formulating the dynamics of the
electroweak interactions of hadrons at low energies, within the framework of
the 1/Nc-expansion in QCD. The emphasis is put on the basic issues of the
approach.


title: Technicolor Evolution

abstract:
  This talk describes how modern theories of dynamical electroweak symmetry
breaking have evolved from the original minimal QCD-like technicolor model in
response to three key challenges: R_b, flavor-changing neutral currents, and
weak isospin violation.


title: Color Superconducting State of Quarks

abstract:
  An introductory review of physics of color superconducting state of matter is
presented. Comparison with superconductivity in electron systems reveals
difficulties involved in formulating color superconductivity theory at
moderately ultra-nuclear density.


title:
Complete meson-meson scattering within one loop in Chiral Perturbation
  Theory: Unitarization and resonances

abstract:
  We review our recent one-loop calculation of all the two meson scattering
amplitudes within SU(3) Chiral Perturbation Theory, i.e. with pions, kaons and
etas. By unitarizing these amplitudes we are able to generate dynamically the
lightest resonances in meson-meson scattering. We thus obtain a remarkable
description of the meson-meson scattering data right from threshold up to 1.2
GeV, in terms of chiral parameters in good agreement with previous
determinations.


title: Solitosynthesis of Q-balls

abstract:
  We study the formation of Q-balls in the early universe, concentrating on
potentials with a cubic or quartic attractive interaction. Large Q-balls can
form via solitosynthesis, a process of gradual charge accretion, provided some
primordial charge assymetry and initial ``seed'' Q-balls exist. We find that
such seeds are possible in theories in which the attractive interaction is of
the form $A H \psi^* \psi$, with a light ``Higgs'' mass. Condensate formation
and fragmentation is only possible for masses $m_\psi$ in the sub-eV range;
these Q-balls may survive untill present.


title: Inclusive Higgs Production at Next-to-Next-to-Leading Order

abstract:
  We describe the contributions of virtual corrections and soft gluon emission
to the inclusive Higgs boson production cross section $pp\to H + X$ computed at
next-to-next-to-leading order in the heavy top quark limit. We also discuss
estimates of the leading non-soft corrections.


title:
Neutrinos from the Annihilation or Decay of Superheavy Relic Dark Matter
  Particles

abstract:
  In light of the mounting evidence that the highest energy cosmic rays are
dominated by protons and not gamma-rays, we discuss the prospect that these
cosmic rays are generated in the decay or annihilation of superheavy relic
particles. We calculate the high energy neutrino spectrum which results and
normalize our results to the ultra-high energy cosmic ray spectrum. We show
that most scenerios are already constrained by present limits placed by the
AMANDA experiment.


title:
Identification of Randall-Sundrum Graviton Resonances at Linear
  Colliders

abstract:
  We discuss several methods which can be used to distinguish the graviton
resonances of the Randall-Sundrum model from the graviton-like resonances which
may occur in other theories. The Breit-Wigner line shape of the RS graviton is
found to be particularly useful. In particular we show that the "effective"
graviton resonance present in the model of Dvali et al ~can be distinguished
from those of the Randall-Sundrum scenario for a reasonably wide range of model
parameters.


title: Testing Theories of Fermion Masses

abstract:
  The origin of quark and lepton masses is one of the outstanding problems of
physics. As the experimental data becomes more and more accurate, testing
theories of fermion masses requires greater care. In this talk we discuss a
theoretical framework for testing those theories with a high energy desert. It
is only with precision tests that we can hope to narrow the set of viable,
beyond the standard model theories.


title: Long-distance contributions to the QCD pressure

abstract:
  The QCD pressure is a most fundamental quantity, for which lattice data is
available up to a few times the critical temperature $T_c$. Perturbation
theory, even at very high temperatures, has serious convergence problems.
Combining analytical and 3d numerical methods, we show that it is possible to
compute the QCD pressure from about $2 T_c$ to infinity. We also describe an
algorithm to generate and classify high order Feynman diagrams which is
tailored to minimize computational effort.


title: Out of Equilibrium Dynamics of Supersymmetry at High Energy Density

abstract:
  We investigate the out of equilibrium dynamics of global chiral supersymmetry
at finite energy density. We concentrate on two specific models. The first is
the massive Wess-Zumino model which we study in a selfconsistent one-loop
approximation. We find that for energy densities above a certain threshold, the
fields are driven dynamically to a point in field space at which the fermionic
component of the superfield is massless. The state, however is found to be
unstable, indicating a breakdown of the one-loop approximation. To investigate
further, we consider an O(N) massive chiral model which is solved exactly in
the large $N$ limit. For sufficiently high energy densities, we find that for
late times the fields reach a nonperturbative minimum of the effective
potential degenerate with the perturbative minimum. This minimum is a true
attractor for O(N) invariant states at high energy densities, and this provides
a mechanism for determining which of the otherwise degenerate vacua is chosen
by the dynamics. The final state for large energy density is a cloud of
massless particles (both bosons and fermions) around this new nonperturbative
supersymmetric minimum. By introducing boson masses which softly break the
supersymmetry, we demonstrate a see-saw mechanism for generating small fermion
masses. We discuss some of the cosmological implications of our results.


title: Astrophysical Polarimetry of Cosmological Sources

abstract:
  Kostelecky and Mewes have recently shown that sensitive constraints can be
placed on some aspects of Lorentz symmetry violation using certain astronomical
data on high-redshift sources. Here, I introduce that data in its astronomical
context, making it clear that these data are robust and accurate for their
purpose. In particular, I explain that spatially extended scattered light from
obscured quasars leads to a centrosymmetric scattering polarization, with
polarization position angle independent of wavelength. Evidentally, these
relationships aren't spoiled by propagation effects as the photons cross the
universe.


title: Relativistic direct Urca processes in cooling neutron stars

abstract:
  We derive a relativistic expression for neutrino energy losses caused by the
direct Urca processes in degenerate baryon matter of neutron stars. We use two
different ways to calculate the emissivity caused by the reactions to our
interest. First we perform a standard calculation by Fermi's ''golden'' rule.
The second calculation, resulting in the same expression, is performed with the
aid of polarization functions of the medium. Our result for neutrino energy
losses strongly differs from previous non-relativistic results. We also discuss
nonconservation of the baryon vector current in reactions through weak charged
currents in the medium, when the asymmetry between protons and neutrons is
considered. The above effects, not discussed in the literature before,
substantially modify the polarization functions responsible for the induced
weak charged currents in baryon matter.


title:
Perturbative and non-perturbative QCD corrections to wide-angle Compton
  scattering

abstract:
  We investigate corrections to the handbag approach for wide-angle Compton
scattering off protons at moderately large momentum transfer: the photon-parton
subprocess is calculated to next-to-leading order QCD and contributions from
the generalized parton distribution E} are taken into account. Photon and
proton helicity flip amplitudes are non-zero due to these corrections which
leads to a wealth of polarization phenomena in Compton scattering. Thus, for
instance, the incoming photon asymmetry or the transverse polarization of the
proton are non-zero although small.


title: Large Quark Rotations Neutrino Oscillations and Proton Decay

abstract:
  The large freedom in the SM fermionic mass matrices allows for large LH and
LH quark rotations. This is a natural possibility in view of the observed large
leptonic mixing. Proton decay and especially its gauge mediated decay is
sensitive also to those mixing angles which are non-relevant in the SM. A model
with realistic mass matrices and large rotations is presented.. It is shown
that the large leptonic mixing leads to enhancement of the proton decay
branching ratios involving muons.


title: On the Status of Three-Neutrino Mixing

abstract:
  All existing solar and atmospheric neutrino oscillation data are described by
the standard two-neutrino formulas with neutrino mass squared differences that
satisfy the hierarchy relation $\Delta m^{2}_{sol} \ll \Delta m^{2}_{atm}$. We
discuss this phenomenon from the point of view of three-neutrino mixing.
Possibilities to see effects of three-neutrino mixing and, in particular,
effects of CP-violation in the lepton sector depend on the values of
$|U_{e3}|^2 $ and $\Delta m^{2}_{sol}$. We present an upper bound of
$|U_{e3}|^2 $, which was obtained from a three-neutrino analysis of CHOOZ data
in the case if the solar neutrino oscillation parameters lie in the LMA allowed
region.


title: Two photon width of eta_c

abstract:
  We discuss the measured partial width of the pseudoscalar charmonium state,
$\eta_c$, into two photons. Predictions from potential models are examined and
compared with experimental values. Including radiative corrections, it is found
that present measurements are compatible both with a QCD type potential and
with a static Coulomb potential, with $\alpha_s$ evaluated at two loops.
Results are also compared with those from $\jpsi$ data through the NRQCD model.


title: Transverse Asymmetry in Hadron Leptoproduction at Small x

abstract:
  We consider double spin asymmetries for longitudinally polarized leptons and
transversally polarized protons in diffractive vector meson and $Q \bar Q$
production for the HERMES energy range on the basis of the two-gluon model. The
asymmetry predicted for meson production is quite small. Large asymmetry is
expected for $Q \bar Q$ production.


title: Resummation of the jet broadening in DIS

abstract:
  We calculate the leading and next-to-leading logarithmic resummed
distribution for the jet broadening in deep inelastic scattering, as well as
the power correction for both the distribution and mean value. A truncation of
the answer at NLL accuracy, as is standard, leads to unphysical divergences. We
discuss their origin and show how the problem can be resolved. We then examine
DIS-specific procedures for matching to fixed-order calculations and compare
our results to data. One of the tools developed for the comparison is an NLO
parton distribution evolution code. When compared to PDF sets from MRST and
CTEQ it reveals limited discrepancies in both.


title: Limits on the Mass of a Composite Higgs Boson: an Update

abstract:
  We discuss the bound on the mass of the Higgs boson arising from precision
electroweak measurements in the context of the triviality of the scalar Higgs
model. We show that, including possible effects from the underlying nontrivial
dynamics, a Higgs boson mass of up to 500 GeV is consistent with current data.


title:
MRST2001: partons and alpha_S from precise deep inelastic scattering and
  Tevatron jet data

abstract:
  We use all the available new precise data for deep inelastic and related hard
scattering processes to perform NLO global parton analyses. These new data
allow an improved determination of partons and, in particular, the inclusion of
the recent measurements of the structure functions at HERA and of the inclusive
jets at the Tevatron help to determine the gluon distribution and alpha_S
better than ever before. We find a somewhat smaller gluon at low x than
previous determinations and that alpha_S(M_Z^2) = 0.119 +/- 0.002 (expt.) +/-
0.003 (theory).


title:
Next-to-leading-log renormalization-group running in heavy-quarkonium
  creation and annihilation

abstract:
  In the framework of potential NRQCD, we obtain the next-to-leading-log
renormalization-group running of the matching coefficients for the heavy
quarkonium production currents near threshold. This allows to obtain S-wave
heavy-quarkonium production/annihilation observables with next-to-leading-log
accuracy within perturbative QCD. In particular, we give expressions for the
decays of heavy quarkonium to e^+e^- and to two photons. We also compute the
O(m\alpha^8\ln^3\alpha) corrections to the Hydrogen spectrum.


title: Probing TeV-scale gauge unification by hadronic collisions

abstract:
  Grand unified theories (GUTs) and extra dimensions are potential ingredients
of the new physics that may resolve various outstanding problems of the
Standard Model. If the inverse size of (one of) the extra dimension(s) is
smaller than the GUT scale and standard gauge bosons are allowed to propagate
in the bulk then, among other consequences, the evolution of the gauge
couplings deviates from the usual logarithmic running somewhat below and
between these two scales.
  In this work, we show that if the compactification scale is the order of 10
TeV, then this modified running may be observable at the CERN Large Hadron
Collider in the dijet invariant mass distribution. We also demonstrate that
dijets are highly sensitive to the renormalization effects of the extra
dimensions, and are potential tools for determining the number of dimensions
and the value of the compactification scale.


title: Top quark associated production of topcolor pions at hadron colliders

abstract:
  We investigate the associated production of a neutral physical pion with top
quarks in the context of topcolor assisted technicolor. We find that single-top
associated production does not yield viable rates at either the Tevatron or
LHC. tt-associated production at the Tevatron is suppressed relative to
Standard Model ttH, but at the LHC is strongly enhanced and would allow for
easy observation of the main decay channels to bottom quarks, and possible
observation of the decay to gluons.


title: Soft SUSY-breaking scenarios in the light of Higgs searches at LEP2

abstract:
  The Higgs boson sector of the Minimal Supersymmetric Standard Model (MSSM) is
investigated in a uniform way in the framework of the three most prominent soft
SUSY-breaking scenarios, mSUGRA, mGMSB and mAMSB, especially concerning the
Higgs searches at LEP2.


title:
Nonequilibrium Phenomena in Quantum Field Theory: From Linear Response
  to Dynamical Renormalization Group

abstract:
  This thesis is devoted to studying aspects of real-time nonequilibrium
dynamics in quantum field theory by implementing an initial value formulation
of quantum field theory. The main focus is on the linear relaxation of mean
fields and quantum kinetics in nonequilibrium multiparticle quantum systems
with potential applications to ultrarelativistic heavy ion collisions,
cosmological phase transitions and condensed matter systems. We first study the
damping of fermion mean fields in a fermion-scalar plasma with a view towards
understanding baryon transport phenomena during electroweak baryogenesis.
Secondly, we apply and extend the renormalization group method to study
nonequilibrium dynamics with the goals of constructing a quantum kinetic
description that goes beyond usual Boltzmann kinetics and understanding
anomalous relaxation associated with infrared phenomena. The final part of this
thesis presents a real-time kinetic analysis of direct photon production from a
quark-gluon plasma created in ultrarelativistic heavy ion collisions. We show
that the direct photon yield is significantly enhanced by the lowest order
energy-nonconserving processes originated in the transient lifetime of the
quark-gluon plasma.


title: Nuclear effects in the Drell-Yan process at very high energies

abstract:
  We study Drell-Yan (DY) dilepton production in proton(deuterium)-nucleus and
in nucleus-nucleus collisions within the light-cone color dipole formalism.
This approach is especially suitable for predicting nuclear effects in the DY
cross section for heavy ion collisions, as it provides the impact parameter
dependence of nuclear shadowing and transverse momentum broadening, quantities
that are not available from the standard parton model. For p(D)+A collisions we
calculate nuclear shadowing and investigate nuclear modification of the DY
transverse momentum distribution at RHIC and LHC for kinematics corresponding
to coherence length much longer than the nuclear size. Calculations are
performed separately for transversely and longitudinally polarized DY photons,
and predictions are presented for the dilepton angular distribution.
Furthermore, we calculate nuclear broadening of the mean transverse momentum
squared of DY dileptons as function of the nuclear mass number and energy. We
also predict nuclear effects for the cross section of the DY process in heavy
ion collisions. We found a substantial nuclear shadowing for valence quarks,
stronger than for the sea.


title: Light-front quark model analysis of rare $B\to K\ell^+\ell^-$ decays

abstract:
  Using the light-front quark model, we calculate the transition form factors,
decay rates, and longitudinal lepton polarization asymmetries for the exclusive
rare $B\to K\ell^+\ell^-(\ell=e,\mu,\tau$) decays within the standard model.
Evaluating the timelike form factors, we use the analytic continuation method
in $q^+=0$ frame to obtain the form factors $F_+$ and $F_T$, which are free
from zero-mode. The form factor $F_-$ which is not free from zero-mode in $q^+
= 0$ frame and contaminated by the higher(or nonvalence) Fock states in $q^+
\neq 0$ frame is obtained from an effective treatment for handling the
nonvalence contribution based on the Bethe-Salpeter formalism. The
covariance(i.e. frame-independence) of our model calculation is discussed. We
obtain the branching ratios for ${\rm BR}(B\to K\ell^+\ell^-)$ as
$4.96\times10^{-7}|V_{ts}/V_{cb}|^2$ for $\ell=e,\mu$ and $1.27\times
10^{-7}|V_{ts}/V_{cb}|^2$ for $\ell=\tau$.


title:
Kaon Condensation and Enforced Charge Neutrality of the Color-Flavor
  Locked Phase

abstract:
  We investigate the influence of charged kaon condensation in hadronic sector
on the formation of the electron-free charge neutral quark matter of
equipartition of three light flavors, i.e., a phenomenon called ``enforced
electrical neutrality" of the color-flavor locked (CFL) phase. We employ the
chiral quark model which is assumed to be applicable, "bottom-up," toward
chiral restoration while accessible to kaon condensation in the hadronic
sector. Approaching "bottom-up" the high density regime is more appropriate in
addressing the properties of compact stars than approaching "top-down" from
asymptotic QCD. It turns out that the presence of hadronic kaon condensation
makes the electron-free charge-neutral CFL phase energetically more favorable
with a relatively small color-superconducting gap $\Delta_0\sim 20$ MeV
compared to $\Delta_0\sim 70$ MeV required in the absence of such kaon
condensation.


title:
Violations of local equilibrium and linear response in classical lattice
  theories

abstract:
  We study the dynamics of $\phi^4$ theory and the FPU $\beta$ model under
thermal gradients, from first principles. We analyze quantitatively how local
equilibrium and linear response are violated, paying special care to how we
find observables that unambiguously display these violations. Relations between
these quantities to equations of state are also examined. Further, we discuss
how we can approach similar dynamical problems in continuum quantum field
theory. We analyze how close we are to obtaining the continuum results.


title: Counting tree diagrams: asymptotic results for QCD-like theories

abstract:
  We discuss the enumeration of Feynman diagrams at tree order for processes
with external lines of different types. We show how this can be done by
iterating algebraic Schwinger-Dyson equations. Asymptotic estimates for very
many external lines are derived. Applications include QED, QCD and scalar QED,
and the asymptotic estimates are numerically confronted with the exact results.


title: Strange Vector Form Factor of Kaons

abstract:
  Starting from the $\omega$-$\phi$ mixing, further assuming the coupling of
the quark-current of some flavour to be of universal strenth exclusively to the
component of vector-meson wave function with the same flavour and finally
taking numerical values of the coupling constant ratios $(f_{\omega K \bar
K}/f_{\omega}^e)$, $(f_{\phi K\bar K/f_{\phi}^e)$ from the isoscalar part of a
realistic six-resonance unitary and analytic model of the kaon electromagnetic
structure, the strange-quark vector current form factor behaviour of K-mesons
in space-like and time-like regions is predicted.


title: Theoretical Uncertainties in Sparticle Mass Predictions

abstract:
  We contrast the sparticle spectra obtained from three modern publicly
available codes along model lines in minimal supersymmetric standard model
(MSSM) parameter space. From this we gain an idea of the uncertainties involved
with sparticle spectra calculations. The differences in predicted sparticle
masses are typically at the several percent-level. In the focus-point scenario,
there are differences of 30% in the weak gaugino masses. These uncertainties
need to be reduced in order to obtain accurate information about fundamental
models of supersymmetry breaking.


title:
Tau Polarisation and its Correlations as a Signal for Higgs Bosons -
  Universal Spin Interface for TAUOLA Package

abstract:
  We show how the tau+ tau- spin correlations can be used to improve the
recognition of the parent boson spin, and hence to identify scalar boson H -->
tau+ tau- events from the vector boson Z\gamma --> tau+ tau- background in high
energy accelerator experiments.


title:
About Q2 Dependence of the Asymmetry A_1 from the Similarity of the g_1
  and F_3 Structure Functions

abstract:
  We consider a new approach for taking into account the Q2 dependence of
asymmetry A_1. This approach is based on the similarity of the Q2 behavior and
the shape of the spin-dependent structure function g_1(x,Q^2) and spin averaged
structure function F_3(x,Q^2).


title: The transition of virtual photons into pseudoscalar mesons

abstract:
  The possibility to constrain the meson distribution amplitude from the
transitions of virtual photons to pseudoscalar mesons is investigated. It is
shown that for a large range in the two photon virtualities the transition form
factors are essentially independent of the distribution amplitudes. This in
turn entails parameter-free predictions of QCD.


title: Structure functions at large x

abstract:
  Structure function data together with other measurements from fixed-target
deep inelastic scattering and hadron-hadron collider experiments which
contribute to our knowledge of the parton density functions are reviewed. The
inclusive cross-section measurements of neutral and charged current
interactions at HERA are presented and their impact on the parton density
functions is discussed. Future prospects for an improved knowledge of the
parton density functions at large x are briefly mentioned.


title: Parametrization of the Energy Spectrum in the Tritium Beta Decay

abstract:
  Taking into account mixings among neutrino states, the end of the energy
spectrum of the electron in the tritium beta decay is investigated. It is shown
that for real energy resolutions of a spectrometer, $ \Delta E > 0.08$ eV, the
effective electron neutrino mass should [not] be taken in the form
$m_\beta^{(1)} = \sqrt{\sum|U_{ei}|^2 m_i^2} [m_\beta^{(2)} = \sum|U_{ei}|^2
m_i$.


title:
Constraints on heavy Z' couplings from \Delta S = 2 B^- -> K^- K^- \pi^+
  decay

abstract:
  The heavy Z' boson with family nonuniversal couplings can introduce flavour
changing effects. Constraints on nondiagonal Z' couplings coming from the \mu-e
conversion in a muonic atom, K^0 - \bar{K^0} and B - \bar{B} mixing, epsilon
and epsilon'/ \epsilon CP- violating coefficients have been already
established. By using the OPAL upper bound of the branching ratio for the B^-
-> K^- K^- \pi^+ decay, we indicate additional constraints on the Z' couplings.
We comment also on the constraints of Z' couplings coming from the b->d d
\bar{s} transition. The constraint obtained here from the upper bound of the
B^- -> K^- K^- \pi^+ decay involves a different combination of couplings than
those previously presented, but is much weaker.


title: Supersymmetry and Brane Cosmology

abstract:
  We consider a five-dimensional brane world scenario where the fifth dimension
is compactified on $S^1/Z_2$. We show that the familiar four-dimensional
cosmology on our brane is easily recovered during a primordial stage of
inflation if supersymmetry is exploited. Even if some vacuum energy density
appears localized on our three brane, heavy supersymmetric bulk fields adjust
themselves and acquire a nontrivial configuration along the extra-dimension.
This phenomenon redistributes uniformly the energy density across the bulk and
the resulting energy-momentum tensor does not display any singularity
associated to the initial localized energy density on our three-brane. No jumps
across the brane are present for the derivatives of the metric and Einstein's
equations are solved by constant solutions along the fifth dimension. Our
findings make it clear that cosmological phenomena in the supersymmetric brane
world scenario must be studied taking properly into account bulk supersymmetric
states. This comment is particularly relevant when applied to (super)gravity
since in supersymmetric brane world scenarios, even though chiral matter and
gauge fields may be restricted to live on boundaries, gravity multiplets always
propagate in the bulk.


title: Ultrahigh energy neutrinos, small x and unitarity

abstract:
  The ultrahigh energy cross section for neutrino interactions with nucleons is
reviewed, and unitarity constraints are discussed. We argue that existing QCD
extrapolations are self-consistent, and do not imply a breakdown of the
perturbative expansion in the weak coupling.


title: The Spin of the Nucleon in Effective Models

abstract:
  The three flavor soliton approach for baryons is utilized to discuss effects
of flavor symmetry breaking in the baryon wave--functions on axial current
matrix elements. The flavor content of the singlet axial current matrix
elements, that parameterizes the quark spin contribution to the total angular
momentum, is disentangled and studied as a function of the effective flavor
symmetry breaking. Here the nucleon and the Lambda--hyperon are considered.


title: Low energy threshold corrections to neutrino masses and mixing angles

abstract:
  We compute the low energy threshold corrections to neutrino masses and mixing
in the Standard Model (SM) and its minimal supersymmetric version, using the
effective theory technique. We demonstrate that they stabilize the
renormalization group (RG) running with respect to the choice of the scale to
which the RG equation is integrated. This confirms the correctness of the
recent re-derivation of the RGE for the SM in hep-ph/0108005. The explicit
formulae for the low energy threshold corrections corrections can be applied to
specific models of neutrino masses and mixing.


title:
Gauge-Independent Off-Shell Fermion Self-Energies at Two Loops: The
  Cases of QED and QCD

abstract:
  We use the pinch technique formalism to construct the gauge-independent
off-shell two-loop fermion self-energy, both for Abelian (QED) and non-Abelian
(QCD) gauge theories. The new key observation is that all contributions
originating from the longitudinal parts of gauge boson propagators, by virtue
of the elementary tree-level Ward identities they trigger, give rise to
effective vertices, which do not exist in the original Lagrangian; all such
vertices cancel diagrammatically inside physical quantities, such as current
correlation functions or S-matrix elements. We present two different, but
complementary derivations: First, we explicitly track down the aforementioned
cancellations inside two-loop diagrams, resorting to nothing more than basic
algebraic manipulations. Second, we present an absorptive derivation,
exploiting the unitarity of the S-matrix, and the Ward identities imposed on
tree-level and one-loop physical amplitudes by gauge invariance, in the case of
QED, or by the underlying Becchi-Rouet-Stora symmetry, in the case of QCD. The
propagator-like sub-amplitude defined by means of this latter construction
corresponds precisely to the imaginary parts of the effective self-energy
obtained in the former case; the real part may be obtained from a (twice
subtracted) dispersion relation. As in the one-loop case, the final two-loop
fermion self-energy constructed using either method coincides with the
conventional fermion self-energy computed in the Feynman gauge.


title: Predictions for the unitarity triangle angles in a new parametrization

abstract:
  A new approach to the parametrization of the CKM matrix, $V$, is considered
in which $V$ is written as a linear combination of the unit matrix $I$ and a
non-diagonal matrix $U$ which causes intergenerational-mixing, that is
$V=\cos\theta I+i\sin\theta U$. Such a $V$ depends on 3 real parameters
including the parameter $\theta$. It is interesting that a value of
$\theta=\pi/4$ is required to fit the available data on the CKM-matrix
including CP-violation. Predictions of this fit for the angles $\alpha$,
$\beta$ and $\gamma$ for the unitarity triangle corresponding to
$V_{11}V^*_{13} + V_{21} V^*_{23} +V_{31}V^*_{33} =0$, are given. For
$\theta$=$\pi/4$, we obtain $\alpha=88.46^\circ$, $\beta=45.046^\circ$ and
$\gamma=46.5^\circ$. These values are just about in agreement, within errors,
with the present data. It is very interesting that the unitarity triangle is
expected to be approximately a right-angled, isosceles triangle. Our prediction
$\sin 2\beta = 1$ is in excellent agreement with the value $0.99\pm 0.15\pm
0.05$ reported by the Belle collaboration at the Lepton-Photon 2001 meeting.


title: The Nuts and Bolts of Diffraction

abstract:
  Results on soft and hard diffraction are briefly reviewed with emphasis on
the interplay among factorization properties, universality of rapidity gap
formation and unitarity.


title:
Higgs Sector of Non-minimal Supersymmetric Models at Future Hadron
  Colliders

abstract:
  We investigate the potential of current and planned hadron colliders
operating at the TeV scale in disentangling the structure of the Higgs sector
of non-minimal Supersymmetric extensions of the Standard Model with an extra
gauge singlet. We assume universality of the soft Supersymmetry breaking terms
at the GUT scale as well as a CP-even Higgs boson with mass around 115 GeV, as
suggested by LEP. We find that mixing angles between the doublet and singlet
Higgs states are always small. However, concrete prospects exist at both the
Tevatron (Run II) and the Large Hadron Collider of detecting at least one
neutral Higgs state with a dominant singlet component, in addition to those
available from a doublet Higgs sector which is similar to the one of the
Minimal Supersymmetric Standard Model.


title: Physics of the radion in the Randall-Sundrum scenario

abstract:
  In the Randall-Sundrum solution to the hierarchy problem, the fluctuations of
the size of the extra dimension are characterized by a single scalar field,
called the radion. The radion is expected to have a mass somewhat lower than
the TeV scale with couplings of order 1/TeV to the trace of the energy momentum
tensor. In addition, the radion can mix with the Higgs boson. Implications for
phenomenology are briefly reviewed.


title:
L_e + L_\mu - L_\tau - L_s Symmetry and a Mixed 2+2 Scenario for
  Neutrino Oscillations

abstract:
  Recent results from SuperKamiokande and SNO experiments have set severe
constraints on possible mixings of a light sterile neutrino, \nu_s, with the
three active species required for a simultaneous explanation of the solar,
atmospheric and LSND neutrino oscillation data. A consistent scheme has emerged
from a global analysis of the data wherein two of the neutrinos are nearly
degenerate with a mass of order 1 eV, that mix significantly with the two
lighter states. We present realizations of such a mixed 2+2 oscillation
scenario based on L_e + L_\mu - L_\tau - L_s symmetry (L_i stands for the ith
lepton number). Breaking of of this lepton number symmetry by a small mass term
for \nu_s leads to the required large mixings for both the atmospheric and the
solar neutrino oscillations. Sum rules for the neutrino oscillation parameters
are derived within this scheme, and are shown to be consistent with present
data. These models predict U_{e3} = 0.02-0.03, which can serve as a test of
this idea. We also present gauge models based on mirror extensions of the
Standard Model that naturally lead to a light sterile neutrino with the
required mixing pattern.


title: Reheating and turbulence

abstract:
  We show that the ''turbulent'' particle spectra found in numerical
simulations of the behavior of matter fields during reheating admit a simple
interpretation in terms of hydrodynamic models of the reheating period. We
predict a particle number spectrum $n_{k}\propto k^{-\alpha}$ with $\alpha \sim
2$ for $k\to 0.$


title: Ultrahigh Energy Neutrinos in the Light of SuperK

abstract:
  We propose a novel approach for studying neutrino oscillations with
extragalactic neutrinos. We show that measurement of the neutrino induced
upward hadronic and electromagnetic showers and upward muons could be used to
detect $\nu_\mu \to \nu_\tau$ oscillations. We find significant signal to
background ratios for the hadronic/electromagnetic showers with energies above
10 TeV to 100 TeV initiated by the extragalactic neutrinos. We demonstrate that
a kilometer-size neutrino telescope has a very good chance of detecting
neutrino oscillations.


title: SU(3)_c X SU(3)_L X U(1)_X as an SU(6) X U(1)_X subgroup

abstract:
  An extension of the Standard Model to the local gauge group SU(3)_c X SU(3)_L
X U(1)_X as a family independent model is presented. The mass scales, the gauge
boson masses and the masses for the spin 1/2 particles in the model are
studied. The mass differences between the up and down quark sectors, between
the quarks and leptons, and between the charged and neutral leptons in one
family are analyzed. The existence of two Dirac neutrinos for each family, one
light and one very heavy, is predicted. By using experimental results from LEP,
SLC and atomic parity violation we constrain the mixing angle between the two
neutral currents and the mass of the additoinal neutral gauge boson to be
0.00013 \leq sin{\theta} \leq 0 and 1.5 TeV \leq M_Z2 at 95% CL.


title:
Open Heavy Flavor Production in QCD -- Conceptual Framework and
  Implementation Issues

abstract:
  Heavy flavor production is an important QCD process both in its own right and
as a key component of precision global QCD analysis. Apparent disagreements
between fixed-flavor scheme calculations of b-production rate with experimental
measurements in hadro-, lepto-, and photo-production provide new impetus to a
thorough examination of the theory and phenomenology of this process. We review
existing methods of calculation, and place them in the context of the general
PQCD framework of Collins. A distinction is drawn between scheme dependence and
implementation issues related to quark mass effects near threshold. We point
out a so far overlooked kinematic constraint on the threshold behavior, which
greatly simplifies the variable flavor number scheme. It obviates the need for
the elaborate existing prescriptions, and leads to robust predictions. It can
facilitate the study of current issues on heavy flavor production as well as
precision global QCD analysis.


title:
Muon anomalous magnetic moment: a consistency check for the
  next-to-leading order hadronic contributions

abstract:
  A model for verifying a consistency of the next-to-leading order hadronic
contributions to the muon anomalous magnetic moment with those of the leading
order is proposed. A part of the next-to-leading order hadronic contributions
related to the vacuum polarization is rather accurately reproduced in the
model. I find a new numerical value for the light-by-light hadronic
contribution that leads to agreement with recent experimental result for the
muon anomalous magnetic moment.


title: Quantum corrections to neutrino masses and mixing angles

abstract:
  Contents: 1. Introduction 2. Fermion masses and mixing 3. Neutrino masses in
the effective theory 4. Quantum corrections from the renormalization group
evolution 4.1. RG equations for the CKM matrix 4.2. RG equations for neutrino
masses and mixing angles 4.3. Evolution of the neutrino masses 4.4. Mixing of
two neutrinos 4.5 Mixing of three neutrinos and fixed points 5. Low energy
threshold corrections 5.1. Threshold corrections in the SM 5.2. Threshold
corrections in the MSSM 5.2.1. Three-fold degeneracy and flavour diagonal
corrections 5.2.2. Three-fold degeneracy and flavour non-diagonal corrections
5.2.3. Two-fold degeneracy and threshold corrections 6. Conclusions, Appendix
A, Appendix B, References.


title: Photoproduction of isolated photons at HERA in NLO QCD

abstract:
  The NLO QCD calculation for the photoproduction of the isolated photon with a
large $p_T$ at the HERA $ep$ collider is presented. The single resolved photon
contribution and the QCD corrections of order $\alpha_s$ to the Born term are
consistently included. The sizeable NNLO contributions, the box and the double
resolved photon subprocesses, are taken into account in addition. The
importance of the isolation cut, as well as the influence of other experimental
cuts on the p_T and rapidity eta_gamma distributions are discussed in detail.
Results are compared with experimental data and with the different NLO
calculations.


title: Charming penguin in nonleptonic B decays

abstract:
  In the study of two-body charmless B decays as a mean of looking for direct
CP-violation and measuring the CKM mixing parameters in the Standard Model, the
short-distance penguin contribution with its absorptive part generated by charm
quark loop seems capable of producing sufficient $B \to K\pi$ decays rates, as
obtained in factorization and QCD-improved factorization models. However there
are also long-distance charming penguin contributions which also give rise to a
strong phase due to the rescattering $D^{*}D^{*} \to K\pi$ . In this talk, I
would like to discuss \cite{Isola} a recent work on the long-distance charming
penguin as a a different approach to the calculation of the penguin
contributions in $B \to K\pi$ decays from charmed meson intermediate states.
Using chiral effective Lagrangian for light and heavy mesons, corrected for
hard pion and kaon momenta, we show that the charming-penguin contributions
increase significantly the $B \to K\pi$ decays rates from its short-distance
contributions, giving results in better agreement with experimental data.


title: Accessing transversity with interference fragmentation functions

abstract:
  We discuss in detail the option to access the transversity distribution
function $h_1(x)$ by utilizing the analyzing power of interference
fragmentation functions in two-pion production inside the same current jet. The
transverse polarization of the fragmenting quark is related to the transverse
component of the relative momentum of the hadron pair via a new azimuthal
angle. As a specific example, we spell out thoroughly the way to extract
$h_1(x)$ from a measured single spin asymmetry in two-pion inclusive
lepton-nucleon scattering. To estimate the sizes of observable effects we
employ a spectator model for the fragmentation functions. The resulting
asymmetry of our example is discussed as arising in different scenarios for the
transversity.


title:
Lattice calculation of the zero-recoil form factor of anti-B --> D*
  lepton anti-neutrino: toward a model independent determination of |V(cb)|

abstract:
  We develop a new method in lattice QCD to calculate the form factor F(1) at
zero recoil. This is the main theoretical ingredient needed to determine
|V(cb)| from the exclusive decay anti-B --> D* lepton anti-neutrino. We
introduce three ratios, in which most of statistical and systematic error
cancels, making a precise calculation possible. We fit the heavy-quark mass
dependence directly, and extract the 1/m_Q^2 and three of the four 1/m_Q^3
corrections in the heavy-quark expansion. In this paper we show how the method
works in the quenched approximation, obtaining F(1) = 0.913
(+0.024-0.017)(+/-0.016)(+0.003-0.014)(+0.000-0.016)(+0.006-0.014) where the
uncertainties come, respectively, from statistics and fitting, matching lattice
gauge theory to QCD, lattice spacing dependence, light quark mass effects, and
the quenched approximation. We also discuss how to reduce these uncertainties
and, thus, to obtain a model-independent determination of |V(cb)|.


title: "Glueballs": results and perspectives from the lattice

abstract:
  I review the present status of lattice calculations of properties of
gluon-rich hadrons and comment on future prospects, in view of planned
experiments.


title: Rare decays: theory vs. experiments

abstract:
  We present an overview of rare K, D and B decays. Particular attention is
devoted to those flavour-changing neutral-current processes of K and B mesons
that offer the possibility of new significant tests of the Standard Model. The
sensitivity of these modes to physics beyond the Standard Model and the status
of their experimental study are also discussed.


title:
Momentum Transfer Dependence of the Differential Cross Section for
  $J/\psi$ Production

abstract:
  We discuss the $t$ dependence of
  $J/\psi$ production in the region of $0< -t < M^2_{\psi}$. The forward slope
of the elastic differential cross section is calculated assuming a dipole-type
dependence for the gluon ladder-proton form factor. The $t$ dependence of
$d\sigma/dt$ is obtained using DGLAP evolution both for the elastic channel at
low $-t$ and for the inelastic channel at large values of $-t$, up to $-t\simeq
M^2_{\psi}$. Results are presented and compared with the relevant experimental
data.


title:
NLO corrections in MC event generator for angular distribution of
  Drell-Yan lepton pair production

abstract:
  Using a subtraction method, we derive the formulae suitable for use in
Monte-Carlo event generators to give the angular distribution for the
gluon-quark induced NLO corrections in Drell-Yan lepton pair production. We
also give the corresponding helicity density matrix for W and Z boson
production.


title:
Leptogenesis, neutrinoless double beta decay and terrestrial CP
  violation

abstract:
  Leptogenesis in left-right symmetric theories is studied. The usual see-saw
mechanism is modified by the presence of a left-handed Higgs triplet. A simple
connection between the properties of the light left-handed and heavy
right-handed neutrinos is found. Predictions of this scenario for neutrinoless
double beta decay and terrestrial CP violation in long-baseline experiments are
given. These observables can in principle distinguish different realizations of
the model.


title: SO(10) SUSY GUT Model with a U(1) x Z_2 x Z_2 Flavor Symmetry

abstract:
  An SO(10) SUSY GUT model which leads to maximal atmospheric neutrino mixing
and the LMA solar neutrino solution, developed in collaboration with S.M. Barr,
is briefly described. Since the model is quantitatively predictive, it can be
used to assess the need for a neutrino factory, as shown in collaboration with
S. Geer.


title: CKM Status and Prospects

abstract:
  This presentation reviews the Standard Model formalism governing the weak
decays of quarks, as embodied in the Cabibbo-Kobayashi-Maskawa (CKM) weak
mixing matrix, and summarizes the experimental status and outlook. Two recent
CLEO V_cb analyses are described. Complications from strong interactions in
relating the experimentally accessible quantities to CKM elements are
highlighted, and prospects for addressing those difficulties with LQCD and
CLEO-c are outlined.


title:
The anomalous chiral perturbation theory meson Lagrangian to order $p^6$
  revisited

abstract:
  We present a revised and extended construction of the mesonic Lagrangian
density in chiral perturbation theory (ChPT) at order $p^6$ in the anomalous
(or epsilon) sector, ${\cal{L}}_{6,\epsilon}$. After improving several aspects
of the strategy we used originally, i.e., a more efficient application of
partial integration, the implementation of so-called Bianchi identities, and
additional trace relations, we find the new monomial sets to include 24
$SU(N_f)$, 23 SU(3), and 5 SU(2) elements. Furthermore, we introduce 8
supplementary terms due to the extension of the chiral group to $SU(N_f)_L
\times SU(N_f)_R \times U(1)_V$.


title:
Vacuum-polarization corrections to the parity-nonconserving 6s-7p
  transition amplitude in 133Cs

abstract:
  The dominant one-loop radiative corrections to atomic wave functions, those
associated with vacuum polarization in the nuclear Coulomb field, are evaluated
for the 6s-7s parity-nonconserving (PNC) transition amplitude in 133Cs. These
corrections increase the size of the PNC amplitude by 0.4% and,
correspondingly, increase the difference between the experimental value of the
weak charge Q_W(133Cs) and the value predicted by the standard model.


title:
Charmful Baryonic B Decays $\bar B^0\to\Lambda_c\bar p$ and $\bar
  B\to\Lambda_c\bar p\pi(\rho)$

abstract:
  We study the two-body and three-body charmful baryonic B decays: $\bar B^0\to
\Lambda_c\bar p$ and $\bar B\to \Lambda_c \bar p\pi(\rho)$. The factorizable
W-exchange contribution to $\bar B^0\to\Lambda_c\bar p$ is negligible. Applying
the bag model to evaluate the baryon-to-baryon weak transition matrix element,
we find $B(\bar B^0\to\Lambda_c\bar p)\leq 1.1\times
10^{-5}|g_{B^0p\Sigma_b^+}/6|^2$ with $g_{B^0p\Sigma_b^+}$ being a strong
coupling for the decay $\Sigma_b^+\to \bar B^0 p$ and hence the predicted
branching ratio is well below the current experimental limit. The factorizable
contributions to $B^-\to\Lambda_c\bar p\pi^-$ can account for the observed
branching ratio of order $6\times 10^{-4}$. The branching ratio of order
$2\times 10^{-3}$ for $B^-\to\Lambda_c\bar p\rho^-$ is larger than that of
$B^-\to\Lambda_c\bar p\pi^-$ by a factor of about 2.6. We explain why the
three-body charmful baryonic B decay has a larger rate than the two-body one,
contrary to the case of mesonic B decays.


title: Baryon Spectroscopy at Beijing Electron Positron Collider

abstract:
  BES Collaboration has collected 58 million $J/\psi$ events at the Beijing
Electron-Positron Collider (BEPC). $J/\psi$ decays provide an excellent place
for studying excited nucleons and hyperons -- $N^*$, $\Lambda^*$, $\Sigma^*$
and $\Xi^*$ resonances. Physics motivation, data status, partial wave analyses
and future prospects are presented for the baryon resonance program at BES.


title: Quark number susceptibilities from lattice QCD

abstract:
  Results from our recent investigations of quark number susceptibilities in
both quenched and 2-flavour QCD are presented as a function of valence quark
mass and temperature. A strong reduction (~40%) is seen in the strange quark
susceptibility above Tc in both cases. A comparison of our isospin
susceptibility results with the corresponding weak coupling expansion reveals
once again the non-perturbative nature of the plasma up to 3 Tc. Evidence
relating the susceptibility to another non-perturbative phenomena, pionic
screening lengths, is presented.


title:
Proton Decay, Fermion Masses and Texture from Extra Dimensions in SUSY
  GUTs

abstract:
  In supersymmetry, there are gauge invariant dimension 5 proton decay
operators which must be suppressed by a mass scale much larger than the Planck
mass. It is natural to expect that this suppression should be explained by a
mechanism that explains the hierarchical structure of the fermion mass
matrices. We apply this argument to the case where wave functions of chiral
multiplets are localized under a kink background along an extra spatial
dimension and the Yukawa couplings as well as the coefficients of the proton
decay operators are determined by the overlap of the relevant wave functions. A
configuration is found in the context of SU(5) supersymmetric grand unified
theory that yields realistic values of quark masses, mixing angles, CP phase
and charged lepton masses and sufficiently small genuine dimension 5 proton
decay operators. Inclusion of SU(5) breaking effects is essential in order to
obtain non-vanishing CP phase as well as correct lepton masses. The resulting
mass matrix has a texture structure in which texture zeros are a consequence of
extremely small overlap of the wave functions. Our approach requires explicit
breaking of supersymmetry in the extra dimension, which can be realized in
(de)constructing extra dimension.


title: Colour superconductivity in finite systems

abstract:
  In this paper we study the effect of finite size on the two-flavour colour
superconducting state. As well as restricting the quarks to a box, we project
onto states of good baryon number and onto colour singlets, these being
necessary restrictions on any observable ``quark nuggets''. We find that
whereas finite size alone has a significant effect for very small boxes, with
the superconducting state often being destroyed, the effect of projection is to
restore it again. The infinite-volume limit is a good approximation even for
quite small systems.


title:
Gluonic effects in vector meson photoproduction at large momentum
  transfers

abstract:
  Non-perturbative QCD mechanisms are of fundamental importance in strong
interaction physics. In particular, the flavor singlet axial anomaly leads to a
gluonic pole mechanism which has been shown to explain the $\eta^{\prime}$
mass, violations of the OZI rule and more recently the proton spin. We show
here that the interaction derived from the gluonic pole exchange explains the
high momentum transfer behavior of the photoproduction cross sections of vector
mesons at JLab energies.


title:
Statistical Coalescence Model Analysis of J/psi Production in Pb+Pb
  Collisions at 158 A GeV

abstract:
  Production of J/\psi mesons in heavy ion collisions is considered within the
statistical coalescence model. The model is in agreement with the experimental
data of the NA50 Collaboration for Pb+Pb collisions at 158 A GeV in a wide
centrality range, including the so called ``anomalous'' suppression domain. The
model description of the J/psi data requires, however, strong enhancement of
the open charm production in central Pb+Pb collisions. This model prediction
may be checked in the future SPS runs.


title:
The Reach of the Fermilab Tevatron and CERN LHC for Gaugino Mediated
  SUSY Breaking Models

abstract:
  In supersymmetric models with gaugino mediated SUSY breaking (inoMSB), it is
assumed that SUSY breaking on a hidden brane is communicated to the visible
brane via gauge superfields which propagate in the bulk. This leads to GUT
models where the common gaugino mass $m_{1/2}$ is the only soft SUSY breaking
term to receive contributions at tree level. To obtain a viable phenomenology,
it is assumed that the gaugino mass is induced at some scale $M_c$ beyond the
GUT scale, and that additional renormalization group running takes place
between $M_c$ and $M_{GUT}$ as in a SUSY GUT. We assume an SU(5) SUSY GUT above
the GUT scale, and compute the SUSY particle spectrum expected in models with
inoMSB. We use the Monte Carlo program ISAJET to simulate signals within the
inoMSB model, and compute the SUSY reach including cuts and triggers approriate
to Fermilab Tevatron and CERN LHC experiments. We find no reach for SUSY by the
Tevatron collider in the trilepton channel. %either with or without %identified
tau leptons. At the CERN LHC, values of $m_{1/2}=1000$ (1160) GeV can be probed
with 10 (100) fb$^{-1}$ of integrated luminosity, corresponding to a reach in
terms of $m_{\tg}$ of 2150 (2500) GeV. The inoMSB model and mSUGRA can likely
only be differentiated at a linear $e^+e^-$ collider with sufficient energy to
produce sleptons and charginos.


title: Leptoproduction of Polarized Vector Mesons

abstract:
  We present a status report on a study of vector meson leptoproduction for the
HERA energy range on the basis of the generalized handbag approach. In contrast
to the leading twist approach transverse degrees of freedom as well as Sudakov
suppressions are taken into account in the subprocess. First results for the
cross section for photoproduction of longitudinally polarized rho-mesons are
found to be in fair agreement with experiment.


title: Neutrino Anomalies and Quasi-Dirac neutrinos

abstract:
  We discuss possibility of describing solar, atmospheric and LSND results with
four neutrinos forming two quasi-degenerate pairs. The simplest versions of
this 2+2 scheme with either $\nu_e$ or $\nu_\mu$ mixing exclusively with
sterile neutrino is disfavored by the SNO and atmospheric neutrino results
respectively. A generalized scheme with sterile state participating in both the
solar and atmospheric oscillations is still allowed. We show thasolar and
atmospheric oscillations is still allowed. We show that the complex pattern of
mixing needed for this purpose follows from a simple L_e+L_\mu-L_\tau-L_s
symmetry. Specific form of L_e+L_\mu-L_\tau-L_s symmetric mass matrix is
determined from experimental results. Two theoretical schemes which lead to
this form and a proper breaking of L_e+L_\mu-L_\tau-L_s symmetry are discussed.


title: The non-forward BFKL amplitude and rapidity gap physics

abstract:
  We discuss the BFKL approach to processes with large momentum transferred
through a rapidity gap. The Mueller and Tang scheme to the BFKL non-forward
parton-parton elastic scattering amplitude at large $t$, is extended to include
higher conformal spins. The new contributions are found to decrease with
increasing energy, as follows from the gluon reggeisation phenomenon, and to
vanish for asymptotically high energies. However, at moderate energies and high
$|t|$, the higher conformal spins dominate the amplitude. We illustrate the
effects by studying the production of two high $E_T$ jets separated by a
rapidity gap at HERA energies. In a simplified framework, we find excellent
agreement with the HERA photoproduction data once we incorporate the rapidity
gap survival probability against soft rescattering effects. We emphasize that
measurements of the analogous process in electroproduction may probe different
summations over conformal spins.


title:
Associated t anti-t H production at a VLHC: measuring the top-quark
  Yukawa coupling

abstract:
  Future hadron colliders will have the potential to measure some of the most
relevant Higgs boson couplings with high precision. In this paper we
investigate the potential of a Very Large Hadron Collider (VLHC) to measure the
top-quark Yukawa coupling.


title:
Collider Implications of Kaluza-Klein Excitations of the Electroweak
  Gauge Bosons

abstract:
  It is possible for the SM fields to propagate into one or more large extra
compact dimensions. Such fields have associated KK excitations that produce
additional contributions to the SM processes. We calculate the effects that
these KK excitations have on cross sections for $e^{+}e^{-}$ collider processes
in a model in which the SM gauge bosons, and perhaps the Higgs, can propagate
into one TeV$^{-1}$-size extra compact dimension. Specifically, we consider
muon pair production, Bhabha scattering, dijet production, Higgs production,
and single-photon production. At prospective high energy $e^{+}e^{-}$
colliders, we find significant deviations from the SM cross sections: For
example, a 600 GeV collider produces a 20% reduction in the cross section for
muon pair production as compared to the SM for a compactification scale of 3.5
TeV. The effect is much smaller at LEP2 energies, where the compactification
scale must be lower than 2 TeV in order to produce a 6% effect.


title: A Road to the Standard Grand Unified Theory

abstract:
  In this talk, we propose a GUT scenario in which doublet-triplet splitting is
naturally realized in SO(10) unification using the Dimopoulos-Wilczek mechanism
and the realistic mass matrices of quarks and leptons are obtained in a simple
way. For the neutrino sector, bi-maximal neutrino mixing angles are realized.
Moreover, the generic interaction is allowed, namely, all the terms which are
allowed by the symmetry are included in the scenario. Therefore, once we fix
the integer number charges of the anomalous U(1)_A symmetry, which plays an
essential role in the scenario, all the scales, GUT breaking scale, mass scales
of superheavy particles, are determined. The scenario can be extended into E_6
unification, in which a condition for suppression of flavor changing neutral
current (FCNC) is automatically satisfied.


title: Off-shell Suppression of Renormalons in Non-relativistic QCD Boundstates

abstract:
  We study an effect of the off-shellness of the quark and antiquark inside a
heavy quarkonium system on IR renormalons contained in the perturbative
computations of the quarkonium energy levels. We demonstrate that, when the
off-shellness p_Q^2 -m_Q^2 \sim alpha_S^2 m_Q^2 is larger than m_Q Lambda_QCD,
renormalons in the energy levels as calculated in perturbative QCD are
suppressed by a factor Lambda_QCD/alpha_S^2 m_Q as compared to those in 2
m_pole + V_QCD(r). In this case the residual O(Lambda_QCD^4) renormalon has the
same dimension as that of the leading gluon-condensate contribution.


title: Extraction of gamma

abstract:
  After a brief look at the well-known standard approaches to determine the
angle gamma of the unitarity triangle, we focus on two kinds of strategies,
employing $B\to\pi K$ modes, and U-spin-related B decays. Interesting
"puzzles", which may already be indicated by the present B-factory data, are
pointed out, and the importance of the extraction of hadronic parameters, which
are provided by these strategies as by-products, is emphasized.


title: Renormalization Group Flow in large N_c

abstract:
  We calculate renormalization group flow equations for the linear sigma-model
in large N_c approximation. The flow equations decouple and can be solved
analytically. The solution is equal to a self consistent solution of the NJL
model in the same approximation, which shows that flow equations are a
promising method to extend the calculation to higher order in 1/N_c. Including
explicit chiral symmetry breaking, the large N_c approximation describes
physics reasonably well. We further compare the analytic solution to the
usually used polynomial truncation and find consistency.


title:
The spontaneous generation of magnetic and chromomagnetic fields at high
  temperature in the Standard Model

abstract:
  The spontaneous generation of the magnetic and chromomagnetic fields at high
temperature is investigated in the Standard Model. The consistent effective
potential including the one-loop and the daisy diagrams of all boson and
fermion fields is calculated. The mixing of the generated fields due to the
quark loop diagram is studied in detail. It is found that the quark
contribution increases the magnetic and chromomagnetic field strengths as
compared with the separate generation of fields. The magnetized vacuum state is
stable due to the magnetic gauge field masses included in the daisy diagrams.
Some applications of the results obtained are discussed.


title: Sum rules for total hadronic widths of mesons

abstract:
  Mass sum rules for meson multiplets derived from exotic commutators may be
written for complex masses. Then the real parts give the well known mass
formulae (GM-O, Schwinger, Ideal) and the imaginary ones give the corresponding
sum rules for total hadronic widths. The masses and widths of the meson nonets
submit to a definite orders. It thus follows that tables of the meson nonets
should include information about masses, widths and the orders as well as the
mixing angle. The width sum rule for the nonet complying with Schwinger mass
formula may be depicted as a straight line in the $(m,\Gamma)$ plane. It is
easily verifiable and satisfied better for high mass nonets.


title: On suppressing the Higgsino-mediated proton decay in SUSY SO(10) GUT's

abstract:
  Using the freedom in SO(10) GUT's one can generalize the existing models
without changing the mass spectrum of fermions to obtain a significant
suppression of proton decay resulting from the baryon number violating
operators of dimension 5. In some limiting cases, their contributions can be
made negligible compared to the dimension 6 operators resulting from the heavy
gauge bosons exchange.


title:
Lepton Flavor Violating Process in Degenerate and Inverse-Hierarchical
  Neutrino Models

abstract:
  We have investigated the lepton flavor violation in the supersymmetric
framework assuming the large mixing angle MSW solution with the
quasi-degenerate and the inverse-hierarchical neutrino masses. In the case of
the quasi-degenerate neutrinos, the predicted branching ratio BR$(\mu \to e
\gamma)$ strongly depends on $m_\nu$ and $U_{e3}$. For $U_{e3}\simeq 0.05$ with
$m_\nu \simeq 0.3 \eV$, the prediction is close to the present experimental
upper bound if the right-handed Majorana neutrino masses are degenerate. On the
other hand, the prediction is larger than the experimental upper bound for
$U_{e3}\geq 0.05$ in the case of the inverse-hierarchical neutrino masses.


title: On the B $ +AFw-to J/+AFw-Psi K^* $ Decay

abstract:
  We calculate the process- and polarization-dependent nonfactorizable terms
$+AFw-widetilde{a}_{+AFw-lambda}$ of the B$+AFw-to$ J$/+AFw-Psi {+AFw-rm K^*}$
decay within the QCD-improved factorization approach. The longitudinal part
$+AFw-widetilde{a}_{0}$ is infrared convergent and large enough to agree with
recent experimental data, provided that the B-K$^*$ form factors
$A_1(m^2_{+AFw-Psi})$ and $A_2(m^2_{+AFw-Psi})$ satisfy some constraints met by
many (but not all) models.
  The transverse parts $+AFw-widetilde{a}_{+AFw-pm}$ on the other hand are
infrared divergent, the procedure used to handle such divergence is discussed
in relation with the B$+AFw-to$ J$/+AFw-Psi {+AFw-rm K}$ case in which the same
problem arises. Our nonzero phases of the helicity amplitudes are consistent
with experimental data recently measured for the first time by the BaBar
collaboration.


title: Implications of a New Effective Chiral Meson Lagrangian

abstract:
  Based on a recently derived effective chiral meson Lagrangian from the
extended SU(2)\otimes SU(2) Nambu -- Jona-Lasinio (ENJL) model, in the linear
realization of chiral symmetry, we extract to leading order in the 1/N_c
expansion all associated relevant three-point functions \rho \to \pi\pi, \sigma
\to \pi\pi, a_1 \to \rho\pi, a_1 \to \sigma\pi, as well as the amplitude for
\pi\pi scattering. We discuss the formal differences of these amplitudes as
compared with those derived in the literature and calculate the associated
decay widths and scattering parameters. The differences have two origins: i)
new terms, which are proportional to the current quark mass and arise from
taking the correct NJL vacuum from the first steps in a proper-time expansion,
are present in the Lagrangian; ii) an implemented chiral covariant treatment of
the diagonalization in the pseudoscalar - axialvector sector induces new
couplings between three or more mesonic fields. Both effects have been derived
from the chiral Ward Takahashi identities, which are fully taken into account
at each order of the proper-time expansion.


title: Search for New Physics Effects at a Linear Collider with Polarized Beams

abstract:
  The four-fermion contact-interaction searches in the process
$e^+e^-\to\mu^+\mu^-$ at a future $e^+e^-$ Linear Collider with c.m. energy
$\sqrt{s}=0.5$ TeV and with both beams longitudinally polarized are studied. We
evaluate the corresponding model-independent constraints on the coupling
constants, emphasizing the role of beam polarization, and make a comparison
with the case of Bhabha scattering.


title: Searching for the CP-Violation Associated with Majorana Neutrinos

abstract:
  The effective Majorana mass which determines the rate of the neutrinoless
double beta decay, |<m>|, is considered in the case of three-neutrino mixing
and massive Majorana neutrinos. Assuming a rather precise determination of the
parameters characterizing the neutrino oscillation solutions of the solar and
atmospheric neutrino problems has been made, we discuss the information a
measurement of |<m>| > (0.005 - 0.010) eV can provide on the value of the
lightest neutrino mass and on the CP-violation in the lepton sector. The
implications of combining a measurement of |<m>| with future measurement of the
neutrino mass in tritium beta-decay experiments for the possible determination
of leptonic CP-violation are emphasized.


title: Bremsstrahlung Radiation as Coherent State in Thermal QED

abstract:
  Based on fully finite temperature field theory we investigate the radiation
probability in the bremsstrahlung process in thermal QED. It turns out that the
infrared divergences resulting from the emission and absorption of the real
photons are canceled by the virtual photon exchange processes at finite
temperature. The full quantum calculation results for soft photons radiation
coincide completely with that obtained in the semi-classical approximation. In
the framework of Thermofield Dynamics it is shown that the bremsstrahlung
radiation in thermal QED is a coherent state, the quasiclassical behavior of
the coherent state leads to above coincidence.


title:
Production of the MSSM Higgs Bosons at Next Generation Linear $e^+e^-$
  Colliders

abstract:
  % insert abstract here We study the production of the Higgs bosons predicted
in the Minimal Supersymmetric extension of the Standard Model $(h^0, H^0, A^0,
H^\pm)$, with the reactions $e^{+}e^{-}\to b\bar b h^0 (H^0, A^0)$, and
$e^+e^-\to \tau^-\bar \nu_\tau H^+, \tau^+\nu_\tau H^-$, using the helicity
formalism. We evaluate cross section of $h^0, H^0, A^0$ and $H^\pm$ in the
limit when $\tan\beta$ is large. The numerical computation is done considering
two stages of a possible Next Linear $e^{+}e^{-}$ Collider: the first with
$\sqrt{s}=500$ $GeV$ and design luminosity 50 $fb^{-1}$, and the second with
$\sqrt{s}=1$ $TeV$ and luminosity 100-200 $fb^{-1}$.


title:
Inverse Beta Decay in a Nonequilibrium Antineutrino Flux from a Nuclear
  Reactor

abstract:
  The evolution of the reactor antineutrino spectrum toward equilibrium above
the inverse beta-decay threshold during the reactor operating period and the
decay of residual antineutrino radiation after reactor shutdown are considered.
It is found that, under certain conditions, these processes can play a
significant role in experiments seeking neutrino oscillations.


title:
Parton Distributions Functions of Pion, Kaon and Eta pseudoscalar mesons
  in the NJL model

abstract:
  Parton distributions of pseudoscalar pi,K and eta mesons obtained within the
NJL model using the Pauli-Villars regularization method are analyzed in terms
of LO and NLO evolution, and the valence sea quark and gluon parton
distributions for the pion are obtained at Q^2 = 4 GeV^2 and compared to
existing parametrizations at that scale. Surprisingly, the NLO order effects
turn out to be small compared to the LO ones. The valence distributions are in
good agreement with experimental analyses, but the gluon and sea distributions
come out to be softer in the high-x region and harder in the low-x region than
the experimental analyses suggest.


title:
Heavy Quark Production in CC and NC DIS and The Structure of Real and
  Virtual Photons in NLO QCD

abstract:
  This thesis consists of two parts. In the first part heavy quark production
in neutral current and charged current DIS is studied within the variable
flavor number scheme of Aivazis, Collins, Olness, and Tung (ACOT). For this
purpose all the relevant partonic subprocesses have been calculated to order
O(\alpha_s^1) for general masses and couplings taking into account massive
initial state quark-partons as needed in the variable flavor number scheme of
ACOT. By the calculation of the before missing radiative corrections to
scattering amplitudes on massive quark partons the ACOT scheme could be
completed to full order O(\alpha_s^1). These results might also prove useful
for studying the intrinsic charm content of nucleons. In the second part the
parton content of pions and real and virtual photons is analyzed in leading
order (LO) and next-to-leading oder (NLO) QCD within the framework of the
radiative parton model of Gl\"uck, Reya, and Vogt (GRV). Furthermore, the
factorization of the cross section for the process e^+ e^- -> e^+ e^- X into
fluxes of transverse/longitudinal target photons and the cross sections for
deep inelastic scattering off these target photons is investigated in detail.
It is demonstrated that the factorization remains valid also for virtual P^2 \=
0 target photons in the Bjorken limit P^2 << Q^2. However, the neglected terms
are of the order O(\sqrt{P^2/Q^2}) only and not of the order O(P^2/Q^2) as
might have been naively expected. Finally, the photon structure functions have
been calculated in lowest order perturbation theory according to the doubly
virtual box \gamma^*(P^2) \gamma^*(Q^2) -> q \bar{q}. A useful compilation of
various limits of these general expressions is provided.


title: Generation of Magnetic Fields in Cosmology

abstract:
  Mechanisms of generation of magnetic fields in the early universe which could
seed the present-day large scale galactic magnetic fields, are briefly
reviewed. Three possible ways to create large scale magnetic fields are
discussed: breaking of conformal invariance of electromagnetic interactions and
inflationary stretching of the field wave length, first order cosmological
phase transitions, and chaotic electric currents generated by turbulent flows
in the primeval plasma.


title:
Lepton Flavor Changing Neutral Current Processes at Lepton-Hadron
  Colliders

abstract:
  We investigate the potentials of high energy lepton-proton colliders to
detect a flavor changing $l-l^{\prime}-Z$ or $l-l^{\prime}-\gamma$ couplings
from the processes $ep\to\mu(\tau)X$ and $\mu p\to \tau X$. For the
$l-l^{\prime}-Z$ coupling we consider string inspired $E_6$ model whereas
$l-l^{\prime}-\gamma$ coupling is analyzed in the framework of anomalous
magnetic moment type interaction (AMMI) model.


title: Theory of Multiparticle Production in the Soft Region

abstract:
  We review theoretical and experimental advances in the application of the
perturbative QCD approach to the description of particle distributions in jets
in the (semi) soft region with particular emphasis on HERA physics.


title: On the Field Renormalization Constant for Unstable Particles

abstract:
  A recently proposed normalization condition for the imaginary part of the
self-energy of an unstable particle is shown to lead to a closed expression for
the field renormalization constant Z. In turn, the exact expression for Z is
necessary, in some important cases, in order to avoid power-like infrared
divergences in high orders of perturbation theory. In the same examples, the
width plays the r\^ole of an infrared cutoff and, consequently, Z is not an
analytic function of the coupling constant.


title: Duality in Semi-Exclusive Processes

abstract:
  Semi-exclusive processes like \gamma p \to \pi^+ Y are closely analogous to
DIS, ep \to eX, in the limit where the momentum transfer |t| to the pion and
the mass of the inclusive system Y are large but still much smaller than the
total CM energy. We apply Bloom-Gilman duality to this semi-exclusive process.
The energy dependence of the \gamma p \to \pi^+ n cross section given by
semi-local duality agrees with data for moderate values of |t|, but its
normalization is underestimated by about two orders of magnitude. This
indicates that rather high momentum transfers are required for the validity of
PQCD in the hard subprocess \gamma u \to \pi^+ d. In the case of Compton
scattering \gamma p \to \gamma p the analogous discrepancy is about one order
of magnitude. In electroproduction the virtuality of the incoming photon can be
used to directly measure the hardness of the subprocess.