title: Saturation Effects in Hadronic Cross Sections

abstract:
  We compute total and differential elastic cross sections of high-energy
hadronic collisions in the loop-loop correlation model that provides a unified
description of hadron-hadron, photon-hadron, and photon-photon reactions. The
impact parameter profiles of pp and gamma*p collisions are calculated. For
ultra-high energies the hadron opacity saturates at the black disc limit which
tames the growth of the hadronic cross sections in agreement with the Froissart
bound. We compute the impact parameter dependent gluon distribution of the
proton xG(x,Q^2,b) and find gluon saturation at small Bjorken x. These
saturation effects manifest S-matrix unitarity in hadronic collisions and
should be observable in future cosmic ray and accelerator experiments at
ultra-high energies. The c.m. energies and Bjorken x at which saturation sets
in are determined and LHC and THERA predictions are given.


title:
Pristine Determination of the Unitarity Triangle Using B -> K D0
  Processes

abstract:
  There is no good reason to think that BSM-CP-odd phases(s) will necessarily
cause large deviations in B-physics from predictions of the SM. Therefore,
residual theory error in extraction of the unitarity triangle can undermine
experimental efforts to search for BSM phase(s). We stress that final states
containing D0 or D0-bar in decays of charged and neutral B's can yield all the
angles of the unitarity triangle with negligble theory error (i.e. O(0.1%)).


title:
Calculation of radiative corrections to the effect of parity
  nonconservation in heavy atoms

abstract:
  We calculate the self-energy and the vertex radiative corrections to the
effect of parity nonconservation in heavy atoms. The sum of the corrections is
of the form ${\cal A}\ln(\lambda_C/r_0)+{\calB}$, where ${\cal A}$ and ${\cal
B}$ are functions of $Z\alpha$, and $\lambda_C$ and $r_0$ are the Compton
wavelength and the nuclear radius, respectively. The function ${\cal A}$ is
calculated exactly in $Z\alpha$ and the function ${\cal B}$ is calculated in
the leading order. In the leading order ${\cal A}\propto \alpha(Z\alpha)^2$ and
${\cal B}\propto \alpha(Z\alpha)$. The sum of the corrections is -0.85% for Cs
and -1.48% for Tl. Using these results we have performed analysis of the
experimental data on atomic parity nonconservation. The values obtained for the
nuclear weak charge, $Q_W=-72.81(28)_{exp}(36)_{theor}$ for Cs and
$Q_W=-116.8(1.2)_{exp}(3.4)_{theor}$ for Tl, agree with predictions of the
standard model within $0.6\sigma$. As an application of our approach we have
also calculated dependence of the Lamb shift on the finite nuclear size.


title: Nonexotic Neutral Gauge Bosons

abstract:
  We study theoretical and experimental constraints on electroweak theories
including a new color-singlet and electrically-neutral gauge boson. We first
note that the electric charges of the observed fermions imply that any such Z'
boson may be described by a gauge theory in which the Abelian gauge groups are
the usual hypercharge along with another U(1) component in a kinetic-diagonal
basis. Assuming that the observed quarks and leptons have
generation-independent U(1) charges, and that no new fermions couple to the
standard model gauge bosons, we find that their U(1) charges form a
two-parameter family consistent with anomaly cancellation and viable fermion
masses, provided there are at least three right-handed neutrinos. We then
derive bounds on the Z' mass and couplings imposed by direct production and
Z-pole measurements. For generic charge assignments and a gauge coupling of
electromagnetic strength, the strongest lower bound on the Z' mass comes from
Z-pole measurements, and is of order 1 TeV. If the new U(1) charges are
proportional to B-L, however, there is no tree-level mixing between the Z and
Z', and the best bounds come from the absence of direct production at LEPII and
the Tevatron. If the U(1) gauge coupling is one or two orders of magnitude
below the electromagnetic one, these bounds are satisfied for most values of
the Z' mass.


title: Drum vortons in high density QCD

abstract:
  Recently it was shown that high density QCD supports of number of topological
defects. In particular, there are U(1)_Y strings that arise due to K^0
condensation that occurs when the strange quark mass is relatively large. The
unique feature of these strings is that they possess a nonzero K^+ condensate
that is trapped on the core. In the following we will show that these strings
(with nontrivial core structure) can form closed loops with conserved charge
and currents trapped on the string worldsheet. The presence of conserved
charges allows these topological defects, called vortons, to carry angular
momentum, which makes them classically stable objects. We also give arguments
demonstrating that vortons carry angular momentum very efficiently (in terms of
energy per unit angular momentum) such that they might be the important degrees
of freedom in the cores of neutron stars.


title: Scattering of color dipoles: from low to high energies

abstract:
  A dipole-dipole scattering amplitude is calculated exactly in the first two
orders of perturbation theory. This amplitude is an analytic function of the
relative energy and the dipoles' sizes. The cross section of the dipole-dipole
scattering approaches the high-energy BFKL asymptotics starting from a
relatively large rapidity $\sim 5$.


title:
Operator relation among neutrino fields and oscillation formulas in
  matter

abstract:
  Starting with the relation between two kinds of neutrino field operators
corresponding to definite flavor and mass states, we investigate if the usual
evolution relations for neutrino oscillation in matter can be consistently
derived, in the case of high energy neutrinos. A negative answer is obtained
contrary to an earlier result [P. D. Mannheim, Phys. Rev. D {\bf 37} (1988)
1935]. The reason for such a difference relies essentially on the Bogolyubov
transformation between two kinds of momentum-helicity creation- and
annihilation-operators with definite flavors and masses, which was not taken
into account in previous treatments.


title: Baryons as Solitons in Chiral Quark Models

abstract:
  We describe the formation of solitons in NJL-type models and discuss the
influence of the regularization scheme on the stability of the solution. We
concentrate on models with non-local regulators in which stable solutions exist
without introducing additional constraints.


title: On the Behavior of the Effective QCD Coupling alpha_tau(s) at Low Scales

abstract:
  The hadronic decays of the tau lepton can be used to determine the effective
charge alpha_tau(m^2_tau') for a hypothetical tau-lepton with mass in the range
0 < m_tau' < m_tau. This definition provides a fundamental definition of the
QCD coupling at low mass scales. We study the behavior of alpha_tau at low mass
scales directly from first principles and without any renormalization-scheme
dependence by looking at the experimental data from the OPAL Collaboration. The
results are consistent with the freezing of the physical coupling at mass
scales s = m^2_tau' of order 1 GeV^2 with a magnitude alpha_tau ~ 0.9 +/- 0.1.


title:
The analysis of $B_{d} -> (\eta, \eta^{\prime}) \ell^+ \ell^-$ decays in
  the standard model

abstract:
  We study the differential branching ratio, branching ratio and the
CP-violating asymmetry for the exclusive $B_{d}->(\eta, \eta^{\prime}) \ell^+
\ell^-$ decays in the standard model. We deduce the $B_{d}->(\eta,
\eta^{\prime})$ form factors from the form factors of $B -> \pi$ available in
the literature, by using the $SU(3)_F$ symmetry. We observe that these decay
modes, which are within the reach of forthcoming B-factories, are very
promising to observe CP-violation.


title: Infrared problems with dimensional regularisation at finite temperature

abstract:
  We address the question whether we have to perform the analytic continuation
to 4 space-time dimensions before or after the perturbative expansion has been
made. Using the simple model of large-N scalar field theory, we show how this
affects quantities like the thermal mass and the pressure, why the two
procedures give different results, and how this relates to the infrared
behaviour of the theory. We conclude that the correct procedure is to take the
limit d -> 4 before performing the perturbative expansion. Infrared divergences
arise if one makes the perturbative expansion before going to the physical
space-time dimension and they correspond to logarithms of the coupling in the
exact (nonperturbative or resummed) expression. Finally, we outline how this
may be relevant to the infrared problems encountered in thermal QCD.


title:
Polarized Parton Distribution in Neutrino Induced Heavy Flavor
  Production

abstract:
  In order to examine polarized strange quark distribution, semi-inclusive
$D/\Dbar$ production in neutrino deep inelastic scattering is studied including
${\cal O}(\alpha_s)$ corrections. Cross section and spin asymmetry are
calculated by using various parametrizations of polarized parton distribution
functions. It is found that $\Dbar$ production is promising to directly extract
the polarized strange sea.


title:
The strange-quark chemical potential as an experimentally accessible
  "order parameter" of the deconfinement phase transition for finite
  baryon-density

abstract:
  We consider the change of the strange-quark chemical potential in the phase
diagram of nuclear matter, employing the Wilson loop and scalar quark
condensate order parameters, mass-scaled partition functions and enforcing
flavor conservation. Assuming the region beyond the hadronic phase to be
described by massive, correlated and interacting quarks, in the spirit of
lattice and effective QCD calculations, we find the strange-quark chemical
potential to change sign: from positive in the hadronic phase - to zero upon
deconfinement - to negative in the partonic domain. We propose this change in
the sign of the strange-quark chemical potential to be an experimentally
accessible order parameter and a unique, concise and well-defined indication of
the quark-deconfinement phase transition in nuclear matter.


title: Bottom quark mass and QCD duality

abstract:
  The mass of the bottom quark is analyzed in the context of QCD finite energy
sum rules. In contrast to the conventional approach, we use a large momentum
expansion of the QCD correlator including terms to order \alpha
_{s}^{2}(m_{b}^{2}/q^{2})^{6} with the upsilon resonances from e^{+}e^{-}
annihilation data as main input. A stable result m_{b}(m_{b})=4.19\pm 0.05 GeV}
for the bottom quark mass is obtained. This result agrees with the independent
calculations based on the inverse moment analysis.


title:
The Gross-Neveu model at finite temperature at next to leading order in
  the 1/N expansion

abstract:
  We present new results on the Gross-Neveu model at finite temperature and at
next-to-leading order in the 1/N expansion. In particular, a new expression is
obtained for the effective potential which is explicitly invariant under
renormalization group transformations. The model is used as a playground to
investigate various features of field theory at finite temperature. For example
we verify that, as expected from general arguments, the cancellation of
ultraviolet divergences takes place at finite temperature without the need for
introducing counterterms beyond those of zero-temperature. As well known, the
discrete chiral symmetry of the 1+1 dimensional model is spontaneously broken
at zero temperature and restored, in leading order, at some temperature T_c; we
find that the 1/N approximation breaks down for temperatures below T_c: As the
temperature increases, the fluctuations become eventually too large to be
treated as corrections, and a Landau pole invalidates the calculation of the
effective potential in the vicinity of its minimum. Beyond T_c, the 1/N
expansion becomes again regular: it predicts that in leading order the system
behaves as a free gas of massless fermions and that, at the next-to-leading
order, it remains weakly interacting. In the limit of large temperature, the
pressure coincides with that given by perturbation theory with a coupling
constant defined at a scale of the order of the temperature, as expected from
asymptotic freedom.


title: On the Role of Higher Twist in Polarized Deep Inelastic Scattering

abstract:
  The higher twist corrections $h^N(x)/Q^2$ to the spin dependent proton and
neutron structure functions $g_1^N(x, Q^2)$ are extracted in a model
independent way from experimental data on $g_1^N$ and found to be
non-negligible. It is shown that the NLO QCD polarized parton densities
determined from the data on g1, including higher twist effects, are in good
agreement with those found earlier from our analysis of the data on g1/F1 and
A1 where higher twist effects are negligible. On the contrary, the LO QCD
polarized parton densities obtained from the data on g1, including higher
twist, differ significantly from our previous results.


title: Transverse lattice calculation of the pion light-cone wavefunctions

abstract:
  We calculate the light-cone wavefunctions of the pion by solving the meson
boundstate problem in a coarse transverse lattice gauge theory using DLCQ. A
large-N_c approximation is made and the light-cone Hamiltonian expanded in
massive dynamical fields at fixed lattice spacing. In contrast to earlier
calculations, we include contributions from states containing many gluonic
link-fields between the quarks.The Hamiltonian is renormalised by a combination
of covariance conditions on boundstates and fitting the physical masses M_rho
and M_pi, decay constant f_pi, and the string tension sigma. Good covariance is
obtained for the lightest 0^{-+} state, which we identify with the pion. Many
observables can be deduced from its light-cone wavefunctions.After perturbative
evolution,the quark valence structure function is found to be consistent with
the experimental structure function deduced from Drell-Yan pi-nucleon data in
the valence region x > 0.5. In addition, the pion distribution amplitude is
consistent with the experimental distribution deduced from the pi gamma^* gamma
transition form factor and diffractive dissociation. A new observable we
calculate is the probability for quark helicity correlation. We find a 45%
probability that the valence-quark helicities are aligned in the pion.


title:
Radiative decays of light vector mesons in a quark level linear sigma
  model

abstract:
  We calculate the P0 to gamma gamma, V0 to P0 gamma and V0to V'0 gamma gamma
decays in the framework of a U(3)xU(3) linear sigma model which includes
constituent quarks. For the first two decays this approach improves results
based on the anomalous Wess-Zumino term, with contributions due to SU(3)
symmetry breaking and vector mixing. The phi to (omega,rho) gamma gamma decays
are dominated by resonant eta' exchange . Our calculation for the later decays
improves and update similar calculations in the -closely related- framework of
vector meson dominance. We obtain BR(phi to rho gamma gamma)=2.5x10^{-5} and
BR(phi to omega gamma gamma)=2.8x10^{-6} within the scope of the
high-luminosity phi factories.


title:
Diffractive heavy pseudoscalar-meson productions by weak neutral
  currents

abstract:
  A first theoretical study for neutrino-induced diffractive productions of
heavy pseudoscalar-mesons, \eta_c and \eta_b, off a nucleon is performed based
on factorization formalism in QCD. We evaluate the forward diffractive
production cross section in perturbative QCD in terms of the light-cone wave
functions of Z boson and \eta_{c,b} mesons, and the gluon distribution of the
nucleon. The diffractive production of \eta_c is governed by the axial vector
coupling of the longitudinally polarized Z boson to Q\bar{Q} pair, and the
resulting \eta_c production cross section is larger than the J/\psi one by one
order of magnitude. The bottomonium \eta_b production, which shows up for
higher beam energy, is also discussed.


title: On the Reduction of CP Violation Phases

abstract:
  We describe a method that is used to reduce, significantly, the number of CP
violating complex phases in the Yukawa parameters. With this Reduction of
Complex Phases (RCP) we obtain only one CP violating complex phase in the case
where the neutrinos have an (effective) $3\times 3$ Majorana mass matrix. For
the See Saw extension of the SM with three righthanded neutrinos, and in
connection with CP violation in leptogenis, we reduce the usual 6 complex
phases to only 2.


title:
SO(10) GUT Models and Their Present Success in Explaining Mass and
  Mixing Data

abstract:
  Some features of SO(10) GUT models are reviewed, and a number of such models
in the literature are compared. While some have been eliminated by recent
neutrino data, others are presently successful in explaining the quark and
lepton mass and mixing data. A short description of one very predictive model
is given which illustrates some of the features discussed. Future tests of the
models are pointed out including one which contrasts sharply with those models
based on an $L_e - L_{\mu} - L_{\tau}$ type symmetry.


title:
Top Pair Production Beyond Double-Pole Approximation: pp, pp~ --> 6
  Fermions and 0, 1 or 2 Additional Partons

abstract:
  Hadron collider cross sections for tt~ production and di-lepton,
single-lepton and all-jet decays with up to 2 additional jets are calculated
using complete LO matrix elements with 6-, 7- and 8-particle final states. The
fixed-width, complex-mass and overall-factor schemes (FWS, CMS & OFS) are
employed and the quality of narrow-width and double-pole approximations (NWA &
DPA) is investigated for inclusive production and suppressed backgrounds to new
particle searches. NWA and DPA cross sections differ by 1% or less. The
inclusion of sub- and non-resonant amplitudes effects a cross section increase
of 5-8% at pp supercolliders, but only minor changes at the Tevatron. On-shell
tt~/Wtb backgrounds for the H --> WW decay in weak boson fusion, the hadronic
\tau decay of a heavy H^\pm and the \phi --> hh --> \tau\tau bb~ radion decay
at the LHC are updated, with corrections ranging from 3% to 30%. FWS and CMS
cross sections are uniformly consistent, but OFS cross sections are up to 6%
smaller for some backgrounds.


title: B --> Phi K_S and Supersymmetry

abstract:
  The rare decay B --> Phi K_S is a well-known probe of physics beyond the
Standard Model because it arises only through loop effects yet has the same
time-dependent CP asymmetry as B --> Psi K_S. Motivated by recent data
suggesting new physics in B --> Phi K_S, we look to supersymmetry for possible
explanations, including contributions mediated by gluino loops and by Higgs
bosons. Chirality-preserving LL and RR gluino contributions are generically
small, unless gluinos and squarks masses are close to the current lower bounds.
Higgs contributions are also too small to explain a large asymmetry if we
impose the current upper limit on B(B_s --> mu mu). On the other hand,
chirality-flipping LR and RL gluino contributions can provide sizable effects
and while remaining consistent with related results in B --> Psi K_S, Delta
M_s, B --> X_s gamma and other processes. We discuss how the LR and RL
insertions can be distinguished using other observables, and we provide a
string-based model and other estimates to show that the needed sizes of mass
insertions are reasonable.


title: Stodolsky's Theorem and Neutrino Oscillation Phases -- for pedestrians

abstract:
  Neutrino oscillations are experimentally observable only as a result of
interference between neutrino states with different masses and THE SAME ENERGY.
All interference effects between neutrino states having different energies are
destroyed by the intereaction between the incident neutrino and the neutrino
detector. Erroneous results are frequently obtained by neglecting the
neutrino-detector interactions.


title: The Photon Spectrum in Upsilon Decays

abstract:
  We present a theoretical prediction for the photon spectrum in radiative
Upsilon decay. Parts of the spectrum have already been understood, but an
understanding of the endpoint region has remained elusive. In this paper we
provide the missing piece, and resolve a controversy in the literature. We
treat the endpoint region of Upsilon -> X gamma decay within the framework of
the soft-collinear effective theory (SCET). Within this approach the Upsilon
structure function arises naturally, and kinematic logarithms are summed by
running operators using renormalization group equations. In a previous paper we
studied the color-octet contribution to the decay. Here we treat the
color-singlet contribution. We combine our result with previous results to
obtain the Upsilon -> X gamma spectrum. We find that resumming the
color-singlet contribution in the endpoint gives a result that is in much
better agreement with the data than the leading order prediction.


title: $|V_{ub}|$ determination by $B \to D_s \pi$

abstract:
  We investigate $\ovar{B^0} \to D_s^- \pi^+$ decay in perturbative QCD
approach which has recently been applied to $B$ meson decays. $\ovar{B^0} \to
D_s^- \pi^+$ decay (and its charge conjugated mode) can be one of the hopeful
modes to determine $|V_{ub}|$ since it occurs through $b \to u$ transition
only. We estimate both factorizable and non-factorizable contribution, and show
that the non-factorizable contribution is much less than the factorizable one.
Our calculation gives ${BR}(\ovar{B^0} \to D_s^- \pi^+) = (50 \sim 70) \times
f_{Ds}^2|{V_{ub}}{V_{cs}}|^2$.


title: Precursor of Color Superconductivity

abstract:
  We investigate possible precursory phenomena of color superconductivity at
finite temperature $T$ with an effective theory of QCD. It is found that the
fluctuation of the diquark pair field exists with a prominent strength even
well above the critical temperature $T_c$. We show that such a fluctuaiton
forms a collective mode, the corresponding pole of which approaches the origin
as $T$ is lowered to $T_c$ in the complex energy plane. We discuss the possible
relevance of the precursor to the observables to be detected in heavy-ion
collisions.


title: Multiple Singular Emission in Gauge Theories

abstract:
  I derive a class of functions unifying all singular limits for the emission
of a given number of soft or collinear gluons in tree-level gauge-theory
amplitudes. Each function is a generalization of the single-emission antenna
function of ref. [1]. The helicity-summed squares of these functions are thus
also generalizations to multiple singular emission of the Catani--Seymour
dipole factorization function.


title: Consistent treatment of spin-1 mesons in the light-front formalism

abstract:
  We analyze the matrix element of the electroweak current between $q \qb$
vector meson states in the framework of a covariant extension of the
light-front formalism. The light-front matrix element of a one-body current is
naturally associated with zero modes, which affect some of the form factors
that are necessary to represent the Lorentz structure of the light-front
integral. The angular condition contains some information on zero modes, i.e.,
only if the effect of zero modes is accounted for correctly, is it satisfied.
With plausible assumptions we derive from the angular condition several
consistency conditions which can be used quite generally to determine the zero
mode contribution of form factors. The correctness of this method is tested by
the phenomenological success of the derived form factors. We compare the
predictions of our formalism with those of the standard light-front approach
and with available data. As examples we discuss the magnetic moment of the
$\rho$, the coupling constant $g_{D^\ast D \pi}$, and the coupling constants of
the pseudoscalar density, $g_\pi$ and $g_K$, which provide a phenomenological
link between constituent and current quark masses.


title: Electroweak instantons/sphalerons at VLHC?

abstract:
  There is a close analogy between electroweak instanton-induced baryon plus
lepton number (B+L) violating processes in Quantum Flavor Dynamics (QFD) and
hard QCD instanton-induced chirality violating processes in deep-inelastic
scattering. In view of the recent information about the latter both from
lattice simulations and from the H1 experiment at HERA, it seems worthwhile to
reconsider electroweak B+L violation at high energies. We present a state of
the art evaluation of QFD instanton-induced parton-parton cross-sections, as
relevant at future high energy colliders in the hundreds of TeV regime, such as
the projected Very Large Hadron Collider (VLHC). We find that the
cross-sections are unobservably small in a conservative fiducial kinematical
region inferred from the above mentioned QFD--QCD analogy. An extrapolation --
still compatible with lattice results and HERA -- beyond this conservative
limit indicates possible observability at VLHC.


title: Relativistic Unitarized Quark/Meson Model in Momentum Space

abstract:
  An outline is given how to formulate a relativistic unitarized constituent
quark model of mesons in momentum space, employing harmonic quark confinement.
As a first step, the momentum-space harmonic-oscillator potential is solved in
a relativistically covariant, three-dimensional quasipotential framework for
scalar particles, using the spline technique. Then, an illustrative toy model
with the same dynamical equations but now one $q\bar{q}$ and one meson-meson
channel, coupled to one another through quark exchange describing the $^3P_0$
mechanism, is solved in closed form on a spline basis. Conclusions are
presented on how to generalize the latter to a realistic multichannel
quark/meson model.


title: Forward observables at RHIC, the Tevatron run II and the LHC

abstract:
  We present predictions on the total cross sections and on the ratio of the
real part to the imaginary part of the elastic amplitude (rho parameter) for
present and future pp and pbar p colliders, and on total cross sections for
gamma p -> hadrons at cosmic-ray energies and for gamma gamma -> hadrons up to
sqrt(s)=1 TeV.
  These predictions are based on a study of many possible analytic
parametrisations and invoke the current hadronic dataset at t=0. The
uncertainties on total cross sections, including the systematic theoretical
errors, reach 1% at RHIC, 3% at the Tevatron, and 10% at the LHC, whereas those
on the rho parameter are respectively 10%, 17%, and 26%.


title: Once Again about Beam-Size or MD-Effect at Colliding Beams

abstract:
  For several processes at colliding beams, macroscopically large impact
parameters give an essential contribution to the standard cross section. These
impact parameters may be much larger than the transverse sizes of the colliding
bunches. In that case, the standard calculations have to be essentially modify.
The corresponding formulae were given twenty years ago. In recent paper of
Baier and Katkov [17] it was claimed that the previous results about
bremsstrahlung spectrum have to be revised and an additional subtraction
related to the coherent contribution has to be done. This additional term has
been calculated with the result that it may be essential for the performed and
future experiments. In the present paper we analyze in detail the coherent and
incoherent contributions in the conditions, considered in paper [17]. In
contract to above claims, we found out that under these conditions the coherent
contribution is completely negligible and, therefore, there is no need to
revise the previous results.


title:
Analysis of the freeze-out parameters for RHIC, SPS and AGS based on ${
  {dE_{T}} \over {d\eta}} / {{dN_{ch}} \over {d\eta}}$ ratio measurements

abstract:
  The ratio ${{dE_{T}} \over {d\eta}} / {{dN_{ch}} \over {d\eta}}$ is analyzed
in the framework of a single-freeze-out thermal hadron gas model. Decays of
hadron resonances are taken into account in evaluations of this ratio. The
predictions of the model at the freeze-out parameters, established previously
from observed particle yields, agree very well with the ratio measured at RHIC,
SPS and AGS.


title: Quantum field theory approach to the vacuum replica in QCD

abstract:
  Quantum field theory is used to describe the contribution of possible new QCD
vacuum replica to hadronic processes. This sigma-like new state has been
recently shown to be likely to appear for any realistic four-quark interaction
kernel as a consequence of chiral symmetry. The local operator creating the
replica vacuum state is constructed explicitly. Applications to physical
processes are outlined.


title: Relating a gluon mass scale to an infrared fixed point in pure gauge QCD

abstract:
  We show that in pure gauge QCD (or any pure non-Abelian gauge theory) the
condition for the existence of a global minimum of energy with a gluon (gauge
boson) mass scale also implies the existence of a fixed point of the $\beta$
function. We argue that the frozen value of the coupling constant found in some
solutions of the Schwinger-Dyson equations of QCD can be related to this fixed
point. We also discuss how the inclusion of fermions modifies this property.


title: A Conjecture about Hadrons

abstract:
  We conjecture that in the chiral limit of QCD the spectrum of hadrons is
comprised of decoupled, reducible chiral multiplets. A simple rule is developed
which identifies the chiral representations filled out by the ground-state
hadrons. Our arguments are based on the algebraic structure of superconvergence
relations derived by Weinberg from the high-energy behavior of pion-hadron
scattering amplitudes.


title:
Dynamical renormalization group approach to transport in
  ultrarelativistic plasmas: the electrical conductivity in high temperature
  QED

abstract:
  The DC electrical conductivity of an ultrarelativistic QED plasma is studied
in real time by implementing the dynamical renormalization group. The
conductivity is obtained from the realtime dependence of a dissipative kernel
related to the retarded photon polarization. Pinch singularities in the
imaginary part of the polarization are manifest as growing secular terms that
in the perturbative expansion of this kernel. The leading secular terms are
studied explicitly and it is shown that they are insensitive to the anomalous
damping of hard fermions as a result of a cancellation between self-energy and
vertex corrections. The resummation of the secular terms via the dynamical
renormalization group leads directly to a renormalization group equation in
real time, which is the Boltzmann equation for the (gauge invariant) fermion
distribution function. A direct correspondence between the perturbative
expansion and the linearized Boltzmann equation is established, allowing a
direct identification of the self energy and vertex contributions to the
collision term.We obtain a Fokker-Planck equation in momentum space that
describes the dynamics of the departure from equilibrium to leading logarithmic
order in the coupling.This determines that the transport time scale is given by
t_{tr}=(24 pi)/[e^4 T \ln(1/e)}]. The solution of the Fokker-Planck equation
approaches asymptotically the steady- state solution as sim e^{-t/(4.038
t_{tr})}.The steady-state solution leads to the conductivity sigma = 15.698
T/[e^2 ln(1/e)] to leading logarithmic order. We discuss the contributions
beyond leading logarithms as well as beyond the Boltzmann equation. The
dynamical renormalization group provides a link between linear response in
quantum field theory and kinetic theory.


title:
Single Quark Transition Model Analysis of Electromagnetic Nucleon
  Resonance Transitions in the [70,1-] Supermultiplet

abstract:
  We apply the single quark transition model to resonance transition amplitudes
extracted from photo-and electroproduction data. We use experimental data on
the S11(1535) and D13(1520) nucleon resonances to extract the amplitudes for
the electromagnetic transition from the nucleon ground state to the [70,1-]
SU(6)xO(3) supermultiplet, and make predictions for the transition amplitudes
of all other states associated with the [70,1-]. We find suprisingly good
agreement with the data.


title:
Leading order pQCD hadron production and nuclear modification factors at
  RHIC and the LHC

abstract:
  Hadron production in leading order pQCD is reviewed. The shape of the single
inclusive particle spectra is well described for $p_T \geq 2-3$ GeV at center
of mass energies from 20 GeV to 2 TeV. The phenomenological K-factor is found
to decrease systematically with $\sqrt{s}$. For ultra-relativistic heavy ion
reactions the calculation is augmented with the effects of initial multiple
parton scattering and final state radiative energy loss. Baseline CERN-LHC
predictions for hadron production in $p+p$ and suppression in central $Pb+Pb$
reactions at $\sqrt{s} = 5.5$ TeV are given in comparison to the corresponding
results at BNL-RHIC and CERN-SPS energies.


title: The flavor distribution of Cosmic Neutrinos

abstract:
  Simple approximate expressions for the relative flavor fluxes of energetic
cosmic neutrinos detected on Earth, are presented in terms of their initial
fluxes at the surface of the producing cosmic sites, assuming the neutrino
mixing angles to lie in the experimentally favored region. These expressions
highlight the main sensitivities to the initial production fluxes as well as to
small variations of the mixing angles within the experimentally preferred
region, thus providing simple methods to disentangle these physical quantities
from cosmic neutrino data. This is more so, due to some striking mathematical
properties of the relative neutrino flavors at $(s_{23}=1/\sqrt{2},
\~s_{13}=0)$, which somehow characterize the whole experimentally preferred
region.
  We also assess the quality of our approximate expressions through a numerical
comparison with the exact results.


title: Phenomenology of Supersymmetric Large Extra Dimensions

abstract:
  We study the phenomenology of a supersymmetric bulk in the scenario of large
extra dimensions. The virtual exchange of gravitino KK states in selectron pair
production in polarized \epem collisions is examined. The leading order
operator for this exchange is dimension six, in contrast to that of graviton KK
exchange which induces a dimension eight operator at lowest order. Some
kinematic distributions for selectron production are presented. These processes
yield an enormous sensitivity to the fundamental higher dimensional Planck
scale.


title: Constraints on pre-big bang parameter space from CMBR anisotropies

abstract:
  The so-called curvaton mechanism --a way to convert isocurvature
perturbations into adiabatic ones-- is investigated both analytically and
numerically in a pre-big bang scenario where the role of the curvaton is played
by a sufficiently massive Kalb--Ramond axion of superstring theory. When
combined with observations of CMBR anisotropies at large and moderate angular
scales, the present analysis allows us to constrain quite considerably the
parameter space of the model: in particular, the initial displacement of the
axion from the minimum of its potential and the rate of evolution of the
compactification volume during pre-big bang inflation. The combination of
theoretical and experimental constraints favours a slightly blue spectrum of
scalar perturbations, and/or a value of the string scale in the vicinity of the
SUSY-GUT scale.


title: On the Neutrino Mass Spectrum and Neutrinoless Double-Beta Decay

abstract:
  Assuming 3-nu mixing, neutrino oscillation explanation of the solar and
atmospheric neutrino data and of the first KamLAND results, massive Majorana
neutrinos and neutrinoless double-beta decay generated only by the (V-A)
charged current weak interaction via the exchange of the three Majorana
neutrinos, we analyze in detail the possibility of determining the type of the
neutrino mass spectrum by measuring of the effective Majorana mass |<m>| in
neutrinoless double-beta decay. The three possible types of neutrino mass
spectrum are considered: i) normal hierarchical (NH), m1 << m2 << m3, ii)
inverted hierarchical (IH), m1 << m2 \simeq m3, and iii) quasi-degenerate (QD),
m1 \simeq m2 \simeq m3 \geq 0.20 eV. The uncertainty in the measured value of
|<m>| due to the imprecise knowledge of the relevant nuclear matrix elements is
taken into account in the analysis. We derive the ranges of values of tan^2
theta_\odot, theta_\odot being the mixing angle which controls the solar
neutrino oscillations, and of the nuclear matrix element uncertainty factor,
for which the measurement of |<m>| would allow one to discriminate between the
NH and IH, NH and QD and IH and QD spectra.


title:
Probing Topcolor-Assisted Technicolor from Top-Charm Associated
  Production at LHC

abstract:
  We propose to probe the topcolor-assisted technicolor (TC2) model from the
top-charm associated productions at the LHC, which are highly suppressed in the
Standard Model. Due to the flavor-changing couplings of the top quark with the
scalars (top-pions and top-Higgs) in TC2 model, the top-charm associated
productions can occur via both the s-channel and t-channel parton processes by
exchanging a scalar field at the LHC. We examined these processes through Monte
Carlo simulation and found that they can reach the observable level at the LHC
in quite a large part of the parameter space of the TC2 model.


title: On the Resummation of Large QCD Corrections to photon photon to b anti-b

abstract:
  We study the resummation of large QCD radiative corrections up to the next to
leading logarithmic accuracy to the process photon photon to b anti-b; i.e., we
resum logarithms of the type alpha_s^p log^{2p}{m^2/s} and alpha_s^p
log^{2p-1}{m^2/s} (m is the quark mass). The only source of all the logarithms
to this accuracy is the off-shell Sudakov form factor included into the
triangle topologies of the one-loop box diagram. We prove that any other
configurations of diagrams to this accuracy, either cancel in subgroups or
develop a universal on-shell Sudakov exponent due to the final quark anti-quark
lines. We study the mechanism of cancellations between the different diagrams,
which leads to the simple resummed results. We show the cancellation explicitly
at three loops for the leading and at two loops for the next-to-leading
logarithms. We also point out the general mechanism responsible for it, and
discuss how it can be extended to higher orders.


title: CPT violating neutrinos in the light of KamLAND and Super-K

abstract:
  We show that a hierarchical CPT violating neutrino spectrum can
simultaneously accommodate all published neutrino data, including the LSND
result, with a total chi^2 which is almost identical to the CPT conserving best
fit. In our scenario the oscillation signal seen by the KamLAND experiment in
antineutrinos is independent of the LMA solar oscillation signal seen in
neutrinos. A larger antineutrino mass splitting accounts for the LSND signal
and also contributes to atmospheric oscillations. Because of this feature,
there is some tension between our model and certain Super-K atmospheric
results. Thus, if LSND did not exist, our model would survive only at the 99%
confidence level; with LSND, our model is (essentially) statistically
equivalent to the CPT conserving best fit.


title: Hadronic D Decays Involving Scalar Mesons

abstract:
  The nonleptonic weak decays of charmed mesons into a scalar meson and a
pseudoscalar meson are studied. The scalar mesons under consideration are
$\sigma$ [or $f_0(600)$], $\kappa$, $f_0(980)$, $a_0(980)$ and $K^*_0(1430)$. A
consistent picture provided by the data implies that the light scalars below or
near 1 GeV form an SU(3) flavor nonet and are predominately the $q^2\bar q^2$
states, while the scalar mesons above 1 GeV can be described as a $q\bar q$
nonet. Hence, we designate $q^2\bar q^2$ to $\sigma, \kappa, a_0(980),
f_0(980)$ and $q\bar q$ to $K^*_0$. Sizable weak annihilation contributions
induced from final-state interactions are essential for understanding the data.
Except for the Cabibbo doubly suppressed channel $D^+\to f_0K^+$, the data of
$D\to\sigma\pi, f_0\pi, f_0K, K^*_0\pi$ can be accommodated in the generalized
factorization approach. However, the predicted rates for $D\to a_0\pi, a_0K$
are too small by one to two orders of magnitude when compared with the
preliminary measurements. Whether or not one can differentiate between the
two-quark and four-quark pictures for the $f_0(980)$ produced in the hadronic
charm decays depends on the isoscalar $f_0-\sigma$ mixing angle in the $q\bar
q$ model.


title: Neutrinos and magnetic fields: a short review

abstract:
  Neutrinos have no electric charge, but a magnetic field can indirectly affect
neutrino properties and interactions through its effect on charged particles.
After a brief field-theoretic discussion of charged particles in magnetic
fields, we discuss two broad kinds of magnetic field effects on neutrinos.
First, effects which come through virtual charged particles and alter neutrino
properties. Second, effects which alter neutrino interactions through charged
particles in the initial or final state. We end with some discussion about
possible physical implications of these effects.


title:
On Gauge couplings, "Large" extra-dimensions and the limit alpha'->0 of
  the String

abstract:
  Using an effective field theory (EFT) approach for a generic model with two
additional dimensions compactified on a two-torus, we compute the total
one-loop radiative corrections to the gauge couplings due to associated
Kaluza-Klein massive and massless states. A consistent treatment of both
infrared (IR) and ultraviolet (UV) divergences shows a connection via infrared
regulator effects between the massless and massive sectors of a compactified
theory. A new correction to the gauge couplings is found such that their UV
behaviour is sensitive to IR regulator dependent effects in the sector of
(infinitely many) massive modes. This correction is a one-loop UV-IR mixing
effect due to infinitely many Kaluza-Klein modes and exists for two compact
dimensions. The link with string theory is addressed to show that this
correction, logarithmic in the UV scale, cannot be recovered from known
(infrared regularised) string calculations in the field theory ``limit''
alpha'->0. We explain the origin of this discrepancy and address some of its
implications.


title: TeV-scale Z' bosons in intersecting D-brane SM-like models

abstract:
  Recent string constructions with intersecting D6 and D5 brane models
succeeded in predicting in the low energy limit a symmetry group and a
fermionic spectrum similar to that of the SM. In such constructions additional
U(1) fields are a generic presence and they (or linear combinations thereof)
become massive through a string mechanism which couples them to RR two-forms.
$U(1)_Y$ of hypercharge emerges as a linear combination of the initial U(1)
symmetries while the massive U(1) fields induce (through mixing with Z boson)
corrections on Z mass. $\rho$ parameter constraints on the latter allow one to
set lower bounds on the string scale in the TeV region. These can then be used
to {\it predict} lower bounds on the masses of the additional $Z'$ bosons,
without specific assumptions about the compactification volume.


title: Thermal Meson properties within Chiral Perturbation Theory

abstract:
  We report on our recent work about the description of a meson gas below the
chiral phase transition within the framework of Chiral Perturbation Theory. As
an alternative to the standard treatment, we present a calculation of the quark
condensate which combines the virial expansion and the meson-meson scattering
data. We have also calculated the full one-loop elastic pion scattering
amplitude at finite temperature and we have unitarized the amplitude using the
Inverse Amplitude Method in order to reproduce the temperature effects on the
mass and width of the $\rho$ and $\sigma$ resonances. Our results show a clear
increase of the thermal $\rho$ width, as expected from previous analysis. The
results for the $\sigma$ are consistent with Chiral Symmetry Restoration. We
comment on the relevance of our results within the context of Relativistic
Heavy Ion Collisions.


title: Recent Developments in the Lund Model

abstract:
  A brief introduction to the String Fragmentation Model and its consequences
is presented. We discuss the fragmentation of a general multi-gluon string and
show that it can be formulated as the production of a set of ''plaquettes''
between the hadronic curve and the directrix. We also discuss certain
interesting scaling properties of the partonic states obtained from standard
parton shower algorithms like those in Pythia and Ariadne, which are
communicated to the final state hadrons obtained through our hadronisation
procedure.


title: A Gaussian effective theory for gluon saturation

abstract:
  We construct a Gaussian approximation to the effective theory for the Colour
Glass Condensate which describes correctly the gluon distribution both in the
low density regime at high transverse momenta (above the saturation scale
$Q_s$), and in the high density regime below $Q_s$, and provides a simple
interpolation between these two regimes. At high momenta, the effective theory
reproduces the BFKL dynamics, while at low momenta, it exhibits gluon
saturation and, related to it, colour neutrality over the short distance scale
$1/Q_s \ll 1/\Lambda_{QCD}$. Gauge--invariant quantities computed within this
approximation are automatically infrared finite.


title: Dispersion relations in real and virtual Compton scattering

abstract:
  A unified presentation is given on the use of dispersion relations in the
real and virtual Compton scattering processes off the nucleon. The way in which
dispersion relations for Compton scattering amplitudes establish connections
between low energy nucleon structure quantities, such as polarizabilities or
anomalous magnetic moments, and the nucleon excitation spectrum is reviewed. We
discuss various sum rules for forward real and virtual Compton scattering, such
as the Gerasimov-Drell-Hearn sum rule and its generalizations, the
Burkhardt-Cottingham sum rule, as well as sum rules for forward nucleon
polarizabilities, and review their experimental status. Subsequently, we
address the general case of real Compton scattering (RCS). Various types of
dispersion relations for RCS are presented as tools for extracting nucleon
polarizabilities from the RCS data. The information on nucleon polarizabilities
gained in this way is reviewed and the nucleon structure information encoded in
these quantities is discussed. The dispersion relation formalism is then
extended to virtual Compton scattering (VCS). The information on generalized
nucleon polarizabilities extracted from recent VCS experiments is described,
along with its interpretation in nucleon structure models. As a summary, the
physics content of the existing data is discussed and some perspectives for
future theoretical and experimental activities in this field are presented.


title: Instanton contribution to scalar charmonium and glueball decays

abstract:
  We study instanton contributions to hadronic decays of the scalar glueball,
the pseudoscalar charmonium state $\eta_c$, and the scalar charmonium state
$\chi_c$. Hadronic decays of the $\eta_c$ are of particular interest. The three
main decay channels are $K\bar{K}\pi$, $\eta\pi\pi$ and $\eta'\pi\pi$, each
with an unusually large branching ratio $\sim 5%$. On the quark level, all
three decays correspond to an instanton type vertex
$(\bar{c}c)(\bar{s}s)(\bar{d}d)(\bar{u}u)$. We show that the total decay rate
into three pseudoscalar mesons can be reproduced using an instanton size
distribution consistent with phenomenology and lattice results. Instantons
correctly reproduce the ratio $B(\pi\pi\eta)/B(\pi\pi\eta')$ but over-predict
the ratio $B(K\bar{K}\pi)/B(\pi\pi\eta(\eta'))$. We consider the role of scalar
resonances and suggest that the decay mechanism can be studied by measuring the
angular distribution of decay products.


title: KamLAND and solar neutrino data eliminate the LOW solution

abstract:
  The KamLAND reactor antineutrino experiment has detected a 3.4\sigma flux
suppression relative to the expectation if no neutrino oscillations occur. We
combine KamLAND data with solar neutrino data and show that the LMA solution is
the only viable oscillation solution to the solar neutrino problem at the
4.4\sigma C. L.


title: Solar neutrino oscillation parameters after first KamLAND results

abstract:
  We analyze the energy spectrum of reactor neutrino events recently observed
in the Kamioka Liquid scintillator Anti-Neutrino Detector (KamLAND) and combine
them with solar and terrestrial neutrino data, in the context of two- and
three-family active neutrino oscillations. In the 2-neutrino case, we find that
the solution to the solar neutrino problem at large mixing angle (LMA) is
basically split into two sub-regions, that we denote as LMA-I and LMA-II. The
LMA-I solution, characterized by lower values of the squared neutrino mass gap,
is favored by the global data fit. This picture is not significantly modified
in the 3-neutrino mixing case. A brief discussion is given about the
discrimination of the LMA-I and LMA-II solutions with future KamLAND data. In
both the 2- and 3-neutrino cases, we present a detailed analysis of the
post-KamLAND bounds on the oscillation parameters.


title: Inventory and Outlook of High Energy Physics

abstract:
  Summary talk at ICHEP 2002, Amsterdam, July 2002. I have kept very close to
the content and style of the talk as it was delivered. You may access the
associated PowerPoint presentation through a link at
http://www.ichep02.nl/MainPages/PlenaryProgram.html


title: Combining first KamLAND results with solar neutrino data

abstract:
  We consider the impact of the recent KamLAND data on neutrino oscillations,
the first terrestrial neutrino experiment that can probe the solar neutrino
anomaly. By combining the first 145.1 days of KamLAND data with the full sample
of latest solar neutrino data we find an enhanced rejection against non-LMA
oscillations, allowed only at more than 4 sigma with respect to LMA.
Furthermore, the new data have a strong impact in narrowing down the allowed
range of Delta_m^2 inside the LMA region. In contrast, our global analysis
indicates that the new data have little impact on the location of the best fit
point. In particular the solar neutrino mixing remains significantly
non-maximal (3 sigma).


title: Magnetic monopoles from gauge theory phase transitions

abstract:
  Thermal fluctuations of the gauge field lead to monopole formation at the
grand unified phase transition in the early Universe, even if the transition is
merely a smooth crossover. The dependence of the produced monopole density on
various parameters is qualitatively different from theories with global
symmetries, and the monopoles have a positive correlation at short distances.
The number density of monopoles may be suppressed if the grand unified symmetry
is only restored for a short time by, for instance, nonthermal symmetry
restoration after preheating.


title: Evolution of Parton Fragmentation Functions at Finite Temperature

abstract:
  The first order correction to the parton fragmentation functions in a thermal
medium is derived in the leading logarithmic approximation in the framework of
thermal field theory. The medium-modified evolution equations of the parton
fragmentation functions are also derived. It is shown that all infrared
divergences, both linear and logarithmic, in the real processes are canceled
among themselves and by corresponding virtual corrections. The evolution of the
quark number and the energy loss (or gain) induced by the thermal medium are
investigated.


title:
Two-loop corrections to Radiative Electroweak Symmetry Breaking in the
  MSSM

abstract:
  We study the O(at*as + at^2) two-loop corrections to the minimization
conditions of the MSSM effective potential, providing compact analytical
formulae for the Higgs tadpoles. We connect these results with the
renormalization group running of the MSSM parameters from the grand unification
scale down to the weak scale, and discuss the corrections to the Higgs mixing
parameter mu and to the running CP-odd Higgs mass mA in various scenarios of
gravity-mediated SUSY breaking. We find that the O(at*as) and O(at^2)
contributions partially cancel each other in the minimization conditions. In
comparison with the full one-loop corrections, the O(at*as + at^2) two-loop
corrections significantly weaken the dependence of the parameters mu and mA on
the renormalization scale at which the effective potential is minimized. The
residual two-loop and higher-order corrections to mu and mA are estimated to be
at most 1% in the considered scenarios.


title: Where is the Higgs boson?

abstract:
  Electroweak precision measurements indicate that the standard model Higgs
boson is light and that it could have already been discovered at LEP 2, or
might be found at the Tevatron Run 2. In the context of a TeV^-1 size extra
dimensional model, we argue that the Higgs boson production rates at LEP and
the Tevatron are suppressed, while they might be enhanced at the LHC or at
CLIC. This is due to the possible mixing between brane and bulk components of
the Higgs boson, that is, the non-trivial brane-bulk `location' of the lightest
Higgs. To parametrize this mixing, we consider two Higgs doublets, one confined
to the usual space dimensions and the other propagating in the bulk.
Calculating the production and decay rates for the lightest Higgs boson, we
find that compared to the standard model (SM), the cross section receives a
suppression well below but an enhancement close to and above the
compactification scale M_c. This impacts the discovery of the lightest (SM
like) Higgs boson at colliders. To find a Higgs signal in this model at the
Tevatron Run 2 or at the LC with sqrt(s)=1.5 TeV, a higher luminosity would be
required than in the SM case. Meanwhile, at the LHC or at CLIC with sqrt(s) ~
3-5 TeV one might find highly enhanced production rates. This will enable the
latter experiments to distinguish between the extra dimensional and the SM for
M_c up to about 6 TeV.


title: Grand Unification in Higher Dimensions

abstract:
  We have recently proposed an alternative picture for the physics at the scale
of gauge coupling unification, where the unified symmetry is realized in higher
dimensions but is broken locally by a symmetry breaking defect. Gauge coupling
unification, the quantum numbers of quarks and leptons and the longevity of the
proton arise as phenomena of the symmetrical bulk, while the lightness of the
Higgs doublets and the masses of the light quarks and leptons probe the
symmetry breaking defect. Moreover, the framework is extremely predictive if
the effective higher dimensional theory is valid over a large energy interval
up to the scale of strong coupling. Precise agreement with experiments is
obtained in the simplest theory --- SU(5) in five dimensions with two Higgs
multiplets propagating in the bulk. The weak mixing angle is predicted to be
sin^2theta_w = 0.2313 \pm 0.0004, which fits the data with extraordinary
accuracy. The compactification scale and the strong coupling scale are
determined to be M_c \simeq 5 x 10^{14} GeV and M_s \simeq 1 x 10^{17} GeV,
respectively. Proton decay with a lifetime of order 10^{34} years is expected
with a variety of final states such as e^+pi^0, and several aspects of flavor,
including large neutrino mixing angles, are understood by the geometrical
locations of the matter fields. When combined with a particular supersymmetry
breaking mechanism, the theory predicts large lepton flavor violating mu -> e
and tau -> mu transitions, with all superpartner masses determined by only two
free parameters. The predicted value of the bottom quark mass from Yukawa
unification agrees well with the data. This paper is mainly a review of the
work presented in hep-ph/0103125, hep-ph/0111068 and hep-ph/0205067.


title:
One-loop contributions of charginos and neutralinos to W-pair production
  in E+ E- collisions

abstract:
  We study the one-loop effects of charginos and neutralinos on the helicity
amplitudes for $\eeww$ in the minimal supersymmetric standard model. The
calculation is tested by using two methods. First, the sum rule for the form
factors between $\eeww$ and the process where the external $W^\pm$ bosons are
replaced by the corresponding Goldstone bosons $\omega^\pm$ is employed to test
the analytic expression and the accuracy of the numerical program. Second, the
decoupling property in the large mass limit is used to test the overall
normalization of the amplitudes. These two tests are most effectively carried
out when the amplitudes are expanded in terms of the modified minimal
subtraction ($\bar{\rm MS}$) couplings of the standard model. The resulting
perturbation expansion is valid at collider energies below and around the
threshold of the light supersymmetric particles. We find that the corrections
to the cross section of the longitudinally polarized $W$-pair production can be
as large as -1.4% at the threshold of the light chargino-pair production for
large scattering angles. We also study the effects of the CP-violating phase in
the chargino and neutralino sectors on the helicity amplitudes. We find that
the resulting CP-violating asymmetries can be at most 0.1%.


title: Higgs Theory and Phenomenology in the Standard Model and MSSM

abstract:
  A short review of the theory and phenomenology of Higgs bosons is given, with
focus on the Standard Model (SM) and the minimal supersymmetric extension of
the Standard Model (MSSM). The potential for Higgs boson discovery at the
Tevatron and LHC, and precision Higgs studies at the LHC and a future e+e-
linear collider are briefly surveyed. The phenomenological challenge of the
approach to the decoupling limit, where the properties of the lightest CP-even
Higgs boson of the MSSM are nearly indistinguishable from those of the SM Higgs
boson is emphasized.


title: QCD multi-jet processes and the multiplicity asymptotics

abstract:
  We will offer the formal arguments that the very high multiplicity (VHM)
events are defined by the heavy QCD jets and, with exponential over
multiplicity accuracy, the number of jets must decrease with the increasing
multiplicity. This must rise the mean transverse momentum of secondaries with
multiplicity. The effectiveness of the LLA in the VHM domain is also discussed.


title: Proton mass effects in wide-angle Compton scattering

abstract:
  We investigate proton mass effects in the handbag approach to wide-angle
Compton scattering. We find that theoretical uncertainties due to the proton
mass are significant for photon energies presently studied at Jefferson Lab.
With the proposed energy upgrade such uncertainties will be clearly reduced.


title:
The Interference between Continuum and Resonance in e+e- -> ccbar
  Experiment

abstract:
  e+e- experiments at charmonium production threshold are reviewed, it is found
that the contribution of the continuum process via virtual photon has been
neglected in almost all the experiments and most channels analyzed. It is
pointed out that the contribution of the continuum part may affect the final
results significantly in psi(2S) and psi(3770) decays, while the interference
between the continuum amplitude and the resonance amplitude may even affect the
J/psi decays as well as the psi(2S) and psi(3770). This leads to the revise of
the analysis of strong and electromagnetic amplitude in psi(2S) decays,
including psi(2S) ->VP which is the long lasting puzzle between J/psi and
psi(2S) decays. For psi(3770) physics, a large constructive interference for
light hadron modes and destructive interference for DDbar could be responsible
for the discrepancy between the larger cross section of inclusive hadrons by
direct measurement of e+e- -> psi(3770)-> hadrons than the DDbar cross section
measured using D single-tag and double-tag method.


title:
Determining the Mass of Supersymmetric Scalars at the CLIC Multi-TeV
  e+e- Collider

abstract:
  The determination of the smuon mass at the CLIC multi-TeV e+e- linear
collider has been studied for two CMSSM benchmarks. Results are given for both
the analysis of the muon energy spectrum and the threshold scan method. The
effects of detector resolution, beam-beam interactions and accelerator- induced
backgrounds are discussed. The energy spectrum technique is also applied to the
\~t -> t ~g process to determine the scalar top mass, in scenarios with the
gluino lighter than the squarks.


title:
Non-Abelian Horizontal Symmetry and Anomalous U(1) Symmetry for the
  Supersymmetric Flavor Problem

abstract:
  It is shown that using non-abelian horizontal gauge symmetry and anomalous
U(1)_A symmetry in grand unified theories (GUTs), realistic quark and lepton
mass matrices including large neutrino mixings can be obtained, while the
differences among the scalar fermion masses are sufficiently small for
suppression of various flavor changing neutral current (FCNC) processes,
especially in E_6 GUT. Combining the Higgs sector, in which doublet-triplet
splitting is realized, a complete E_6\times SU(3)_H GUT, in which three
generations are unified into a single multiplet, Psi(27,3), is obtained.


title:
Implications of the KamLAND Measurement on the Lepton Flavor Mixing
  Matrix and the Neutrino Mass Matrix

abstract:
  We explore some important implications of the KamLAND measurment on the
lepton flavor mixing matrix $V$ and the neutrino mass matrix $M$. The
model-independent constraints on nine matrix elements of $V$ are obtained to a
reasonable degree of accuracy. We find that nine two-zero textures of $M$ are
compatible with current experimental data, but two of them are only marginally
allowed. Instructive predictions are given for the absolute neutrino masses,
Majorana phases of CP violation, effective masses of the tritium beta decay and
neutrinoless double beta decay.


title:
The Impact of Universal Extra Dimensions on the Unitarity Triangle and
  Rare K and B Decays

abstract:
  We calculate the contributions of the Kaluza-Klein (KK) modes to the K_L-K_S
mass difference \Delta M_K, the parameter \epsilon_K, the B^0_{d,s}-\bar
B^0_{d,s} mixing mass differences \Delta M_{d,s} and rare decays K^+\to
\pi^+\nu\bar\nu, K_L\to \pi^0\nu\bar\nu, K_L\to\mu\bar\mu, B\to
X_{s,d}\nu\bar\nu and B_{s,d}\to\mu\bar\mu in the Appelquist, Cheng and
Dobrescu (ACD) model with one universal extra dimension. For the
compactification scale 1/R= 200 GeV the KK effects in these processes are
governed by a 17% enhancement of the \Delta F=2 box diagram function S(x_t,1/R)
and by a 37% enhancement of the Z^0 penguin diagram function C(x_t/1/R)
relative to their Standard Model (SM) values. This implies the suppressions of
\vtd by 8%, of \bar\eta by 11% and of the angle \gamma in the unitarity
triangle by 10^\circ. \Delta M_s is increased by 17%. \Delta M_K is essentially
uneffected. All branching ratios considered in this paper are increased with a
hierarchical structure of enhancements: K^+\to \pi^+\nu\bar\nu (16%), K_L\to
\pi^0\nu\bar\nu (17%), B\to X_{d}\nu\bar\nu (22%), (K_L\to\mu\bar\mu)_{\rm SD}
(38%), B\to X_{s}\nu\bar\nu (44%), B_{d}\to\mu\bar\mu (46%) and
B_{s}\to\mu\bar\mu (72%). For 1/R= 250 (300) GeV all these effects are
decreased roughly by a factor of 1.5 (2.0). We give the relevant Feynman rules
for the five dimensional ACD model. We also emphasize that a consistent
calculation of branching ratios has to take into account the modifications in
the values of the CKM parameters. As a byproduct we confirm the dominant \ord
(g_2 G_F m_t^4 R^2) correction from the KK modes to the $Z^0 b\bar b$ vertex
calculated recently in the large m_t limit.


title: Inflationary cosmology, a dissipative quantum field theory process

abstract:
  The current status of early universe cosmology can be summarized as
precision, but inherently limited, data requiring explanation from precision
and robust theory. Specifically inflation is presently the single concrete hope
for solving the early universe problem, since it is generically realizable in
quantum field theory, but treatment of interactions needs considerable
attention. This talk reviews the importance and progress in this direction.


title: Neutrino mixing in a left-right model

abstract:
  We study the mixing among different generations of massive neutrino fields in
a
  $SU(2)_L \times SU(2)_R \times U(1)_Y$ gauge theory which includes Majorana
and Dirac mass terms in the Yukawa sector. Parity can be spontaneously broken
at a scale $v_R\simeq 10^3-10^4$ GeV. We discuss about possible candidates for
the Yukawa coupling matrices and we found that the model can accommodate a
consistent pattern for neutral fermion masses as well as neutrino oscillations.
The left and right sectors can be connected by a new neutral current.


title: The Solar Neutrino Problem after the first results from Kamland

abstract:
  The first results from the KamLAND experiment have provided confirmational
evidence for the Large Mixing Angle (LMA) MSW solution to the solar neutrino
problem. We do a global analysis of solar and the recently announced KamLAND
data (both rate and spectrum) and investigate its effect on the allowed region
in the $\Delta m^2-\tan^2\theta$ plane. The best-fit from a combined analysis
which uses the KamLAND rate plus global solar data comes at $\Delta m^2 = 6.06
\times 10^{-5}$ eV $^2$ and $\tan^2\theta=0.42$, very close to the global solar
best-fit, leaving a large allowed region within the global solar LMA contour.
The inclusion of the KamLAND spectral data in the global fit gives a best-fit
$\Delta m^2 = 7.15 \times 10^{-5}$ eV $^2$ and $\tan^2\theta=0.42$ and
constrains the allowed areas within LMA, leaving essentially two allowed zones.
Maximal mixing though allowed by the KamLAND data alone is disfavored by the
global solar data and remains disallowed at about $3\sigma$. The LOW solution
is now ruled out at about 5$\sigma$ w.r.t. the LMA solution.


title: Solar Neutrinos Before and After KamLAND

abstract:
  We use the recently reported KamLAND measurements on oscillations of reactor
anti-neutrinos, together with the data of previously reported solar neutrino
experiments, to show that: (1) the total 8B neutrino flux emitted by the Sun is
1.00(1.0 \pm 0.06) of the standard solar model (BP00) predicted flux, (2) the
KamLAND measurements reduce the area of the globally allowed oscillation
regions that must be explored in model fitting by six orders of magnitude in
the Delta m^2-tan^2 theta plane, (3) LMA is now the unique oscillation solution
to a CL of 4.7sigma, (4) maximal mixing is disfavored at 3.1 sigma, (5)
active-sterile admixtures are constrained to sin^2 eta<0.13 at 1 sigma, (6) the
observed ^8B flux that is in the form of sterile neutrinos is
0.00^{+0.09}_{-0.00} (1 sigma), of the standard solar model (BP00) predicted
flux, and (7) non-standard solar models that were invented to completely avoid
solar neutrino oscillations are excluded by KamLAND plus solar at 7.9 sigma .
We also refine quantitative predictions for future 7Be and p-p solar neutrino
experiments.


title:
Cronin effect in proton-nucleus collisions: a survey of theoretical
  models

abstract:
  I compare the available theoretical models that describe the Cronin effect on
hadron and minijet production in proton-nucleus collisions, pointing out
similarities and differences among them. The effect may be summarized by the
value of two variables. Their values computed in the different models are
compared in the energy range 27.4 GeV - 5500 GeV. Finally, I propose to use the
pseudorapidity systematics as a further handle to distinguish among the models.


title:
Landau Ghosts and Anti-Ghosts in Condensed Matter and High Density
  Hadronic Matter

abstract:
  It is observed that the ``ghost'' (originally discovered by Landau in quantum
electro-dynamics) and its counterparts in other theories are indeed ubiquitous
as they occur in a one-loop approximation to any conventional (unbroken) gauge
theory. The mechanism is first exposed in its generality via the Dyson equation
and a simple but explicit example in condensed matter is provided through the
static Clausius-Mossotti and its dynamic counterpart the Lorenz-Lorentz
equation. The physical phase transition phenomenon associated with it is found
to be super-radiance. We verify quantitatively that water (and many other polar
liquids) are indeed super-radiant at room temperature. In quantum
chromo-dynamics on the other hand, we encounter, thanks to asymptotic freedom,
an ``anti-ghost'' which is closely associated with color confinement. Thus, in
QCD, free quarks and glue exist in a super-radiant phase and hadronic matter in
the normal one.


title: Extended Higgs Sectors

abstract:
  I give a brief overview of the motivations for and experimental probes of
extended Higgs sectors containing more than the single Higgs doublet field of
the Standard Model.


title:
Determining $\tan\beta$ with Neutral and Charged Higgs Bosons at a
  Future $e^+e^-$ Linear Collider

abstract:
  The ratio of neutral Higgs field vacuum expectation values, tan(beta), is one
of the most important parameters to determine in either the Minimal
Supersymmetric Standard Model (MSSM) or a general type-II Two-Higgs Doublet
Model (2HDM). Assuming an energy and integrated luminosity of sqrts=500 GeV and
L=2000 fb-1 at a future linear collider (LC), we show that a very accurate
determination of tan(beta) will be possible for low and high tan(beta) values
by measuring the production rates of Higgs bosons and reconstructing Higgs
boson decays. In particular, based on a TESLA simulation, and assuming no other
light Higgs bosons and 100<=mA<=200 GeV, we find that the rate for the process
e+e- --> bbA --> bbbb provides a good determination of tan(beta) at high
tan(beta). In the MSSM Higgs sector, in the sample case of mA = 200 GeV, we
find that the rates for e+e- --> bbA+bbH --> bbbb and for e+e- --> HA --> bbbb
provide a good determination of tan(beta) at high and low tan(beta),
respectively. We also show that the direct measurement of the average total
widths of the H and A in e+e- --> HA --> bbbb events provides an excellent
determination of tan(beta) at large values. In addition, the charged Higgs
boson process e+e- --> H+H- --> tbtb has been studied. The sensitivity to
tan(beta) at the LHC obtained directly from heavy Higgs boson production is
briefly compared to the LC results.


title:
Renormalization Group Equations in Gauge Theories with Multiple U(1)
  Groups

abstract:
  Two-loop renormalization group equations in gauge theories with multiple U(1)
groups are presented. Instead of normalizing the abelian gauge fields in
canonical forms, we retain kinetic-mixing terms and treat the mixing
coefficients as free parameters. The beta- and gamma-functions are then
obtained in a straightforward manner.


title: The new analysis of the KLOE data on the phi->eta pi0 gamma decay

abstract:
  In this paper we present the fit to the recent high-statistical KLOE data on
the phi -> eta pi^0 gamma decay. This decay mainly goes through the a_0 gamma
intermediate state. The obtained results differ from those of the previous
fits: data prefer a high a_0 mass and a considerably large a_0 coupling to the
K\bar K}.


title: Selected Topics in Rapidity Gap Physics

abstract:
  This talk will review selected topics in rapidity gap physics. In particular
I will discuss diffractive jet production and the possibility of searching for
the higgs boson using diffraction at the LHC; the dipole picture of diffraction
and saturation; and those processes where a large momentum is transferred
across the rapidity gap, for which there has been recent progress both
experimentally and theoretically.


title:
Theta Term in QCD sum rules at Finite Temperature and the Neutron
  Electric Dipole Moment

abstract:
  By using thermal QCD sum rules to investigate the $\bar{\theta}$ induced
neutron electric dipole moment $d_n$, we have examined the behaviour of broken
CP symmetry at finite temperature. We find that, below the critical
temperature, the ratio $\mid {d_n \over \bar{\theta}}\mid$ slightly decreases
but survives at temperature effects, implying T nonrestoration of CP-invariance
\cite{Chabab}.


title: Pion distribution amplitudes within the instanton model of QCD vacuum

abstract:
  Pion transition form factor for the process $\gamma*\gamma*\to \pi^0$ at
space-like values of photon momenta is calculated within the effective
quark-meson model with the interaction induced by instanton exchange. The
leading and next-to-leading order power asymptotics of the form factor and the
relation between the light-cone pion distribution amplitudes of twists 2 and 4
and the dynamically generated quark mass are found.


title: Astrophysical Tests of Lorentz Symmetry in Electrodynamics

abstract:
  In this talk presented at the Fourth International Workshop on New Worlds in
Astroparticle Physics, I discuss recent constraints on Lorentz violation in
electrodynamics. The observed absence of birefringence of light that has
propagated over cosmological distances bounds some coefficients for Lorentz
violation to 2 x 10^{-32}.


title:
Forward-backward and isospin asymmetry for B -> K* l+ l- decay in the
  standard model and in supersymmetry

abstract:
  We discuss two dedicated observables in exclusive B -> K* l+ l- decay that
can be used to study effects of physics beyond the standard model, namely the
forward-backward asymmetry in the lepton spectrum and the isospin-asymmetry
between decays of charged and neutral B mesons. We consider the region of large
recoil-energy (i.e. small invariant mass of the lepton pair), and employ the
QCD factorization approach to exclusive B meson decays. Sub-leading effects in
the heavy quark mass expansion have been taken into account for the calculation
of the isospin-asymmetry. We give predictions for decay asymmetries in the
standard model, and its supersymmetric extension with minimal flavor violation,
using parameter values allowed by current experimental constraints on B->X_s
gamma decay.


title:
Tevatron Run-1 Z Boson Data and Collins-Soper-Sterman Resummation
  Formalism

abstract:
  We examine the effect of the Z-boson transverse momentum distribution
measured at the Run-1 of the Tevatron on the nonperturbative function of the
Collins-Soper-Sterman (CSS) formalism, which resums large logarithmic terms
from multiple soft gluon emission in hadron collisions. The inclusion of the
Tevatron Run-1 Z-boson data strongly favors a Gaussian form of the CSS
nonperturbative function, when combined with the other low energy Drell-Yan
data in a global fit.


title:
A New 5-Flavour LO Analysis and Parametrization of Parton Distributions
  in the Real Photon

abstract:
  New, radiatively generated, LO quark (u,d,s,c,b) and gluon densities in a
real, unpolarized photon are presented. We perform a global 3-parameter fit,
based on LO DGLAP evolution equations, to all available data for the structure
function F2^gamma(x,Q^2). We adopt a new theoretical approach called ACOT(chi),
originally introduced for the proton, to deal with the heavy-quark thresholds.
This defines our basic model (CJKL model), which gives a very good description
of the experimental data on F2^gamma(x,Q^2), for both Q^2 and x dependences.
For comparison we perform a standard fit using the Fixed Flavour-Number Scheme
(FFNS_CJKL model), updated with respect to the previous fits of this type. We
show the superiority of the CJKL fit over the FFNS_CJKL one and other LO fits
to the F2^gamma(x,Q^2) data. The CJKL model gives also the best description of
the LEP data on the Q^2 dependence of the F2^gamma, averaged over various
x-regions, and the F_2,c^gamma, which were not used directly in the fit.
Finally, a simple analytic parametrization of the resulting parton densities
obtained with the CJKL model is given.


title:
Lectures on Diffraction and Saturation of Nuclear Partons in DIS off
  Heavy Nuclei

abstract:
  The Lorentz contraction of ultrarelativistic nuclei entails a spatial overlap
and fusion (recombination, saturation) of partons belonging to different
nucleons at the same impact parameter. In these lectures we present a
consistent description of the fusion of partons in terms of nuclear attenuation
of color dipole states of the photon and collective Weizs\"acker-Williams (WW)
gluon structure function of a nucleus. The point that all observables for DIS
off nuclei are uniquely calculable in terms of the nuclear WW glue amounts to a
new form of factorization in the saturation regime.
  We start with the theory of multichannel propagation of color dipoles in a
nuclear medium including the color-singlet to color-octet to color-octet
transitions. We show how the Glauber-Gribov formulas are recovered from the
multichannel formalism. Then we derive the two-plateau momentum distribution of
final state (FS) quarks produced in deep inelastic scattering (DIS) off nuclei
in the saturation regime. Then we comment on the signatures of saturation in
exclusive diffractive DIS. A large body of these lectures is on the recent
theory of jet-jet inclusive cross sections. We show that for hard dijets the
decorrelation momentum is of the order of the nuclear saturation momentum
$Q_A$. For minijets with the transverse momentum below the saturation scale we
predict a complete disappearance of the azimuthal jet-jet correlation. We
conclude with comment on a possible relevance of the decorrelation of jets to
the experimental data from the STAR-RHIC Collaboration.


title: Universality of nonperturbative QCD effects in radiative B-decays

abstract:
  We demonstrate, by an explicit one-loop calculation, that at leading twist
the nonperturbative effects in B -> gamma l nu, B -> gamma gamma and B -> gamma
l+ l- radiative decays are contained in a common multiplicative factor
(\Lambda_B(E_\gamma), where E_\gamma is the energy of the photon). We argue
that this result holds also at higher orders. Ratios of the amplitudes for
these processes do not depend on scales below the mass of the B-meson (M_B),
and can be calculated as perturbative series in \alpha_s(M_B)


title:
Model-independent constraints on contact interactions from LEP2 data
  analysis

abstract:
  We derive model-independent constraints on four-fermion contact
interaction-type dynamics from the published preliminary LEP2 experimental data
on e^+e^- annihilation into \mu^+\mu^- and \tau^+\tau^- pairs, measured at
different energies between 130 and 207 GeV. The basic observables are chosen to
be the total cross section and the forward-backward asymmetry, and the analysis
realistically takes into account data uncertainties and correlations among
measurements at the various energies. The combination of data from different
energy points plays an important role in the determination of regions allowed
for the contact interaction coupling constants. In contrast to the more common
one-parameter analyses, we only obtain constraints on pairs of parameters
rather than limits on individual ones.


title: Detector resolution effects on hadronic mass moments in B -> X l nu

abstract:
  We show how to relate moments of the reconstructed hadronic invariant mass
distribution to the moments of the physical spectrum in a model independent
way. The only information needed on detector resolution functions are their
first few moments. Theoretical predictions for the first three moments as
functions of non-perturbative parameters are given for various lepton energy
cuts.


title:
Effects of Vector Coupling on Chiral and Color-superconducting Phase
  Transitions -- interplay among the scalar, pairing and vector interaction --

abstract:
  We investigate effects of the vector interaction appearing in chiral
effective Lagrangians on the chiral and color superconducting (CSC) phase
transitions using Nambu-Jona-Lasinio model. It is shown that the repulsive
density-density interaction coming from the vector term enhances competition
between the chiral symmerty breaking and CSC phase transition: When the vector
coupling is increased, the first order transition between the chiral symmerty
breaking and CSC phase becomes weaker, and the coexisting phase in which both
the chiral and color-gauge symmetries are dynamically broken comes to exisit in
a wider region in the T-\mu plane. We find that the critical line of the first
order transition can have two endpoints for an intermediate range of the vector
coupling.


title:
Gauge-Higgs unification in the 5 dimensional E_6 and E_7 GUTs on
  orbifold

abstract:
  We consider 5 dimensional E_6 and E_7 supersymmetric grand unified theories
(GUTs) on an orbifold S^1/Z_2, in which the Higgs fields arise from the 5th
components of the 5D gauge fields. We introduce matter fields in 5 dimensions,
then the Yukawa interactions are induced from the gauge interactions among the
5th component of gauge fields and the bulk hyper-multiplets. The adjoint and
fundamental representations of bulk matter fields can induce all Yukawa
interactions of the standard model in E_6 GUT. Furthermore, realistic fermion
mass hierarchies and flavor mixings with the CP violating phase can be
reproduced by introducing the 4D brane localized fields and their interactions.
E_7 GUT can produce all Yukawa interactions by introducing only adjoint matter
hyper-multiplet in the bulk. The charge quantization and anomaly free structure
on the 4D wall are satisfactory in our models.


title:
Charged Higgs Production in the 1 TeV Domain as a Probe of
  Supersymmetric Models

abstract:
  We consider the production, at future lepton colliders, of charged Higgs
pairs in supersymmetric models. Assuming a relatively light SUSY scenario, and
working in the MSSM, we show that, for c.m. energies in the one TeV range, a
one-loop logarithmic Sudakov expansion that includes an "effective" next-to
subleading order term is adequate to the expected level of experimental
accuracy. We consider then the coefficient of the linear (subleading) SUSY
Sudakov logarithm and the SUSY next to subleading term of the expansion and
show that their dependence on the supersymmetric parameters of the model is
drastically different. In particular the coefficient of the SUSY logarithm is
only dependent on $\tan\beta$ while the next to subleading term depends on a
larger set of SUSY parameters. This would allow to extract from the data
separate informations and tests of the model.


title: Inelastic J/psi electroproduction in e-p collisions

abstract:
  Following HERA experiments our interest is focused, in the present paper, on
charmonium production in lepton-proton collisions. Inelastic J/\psi
electroproduction is quite difficult to be measured due to the low rates of
events; almost all experimental studies are indeed performed in photoproduction
regime. J/\psi resonance is considered as the product of the hadronization of a
c \bar{c} pair generated via boson-gluon fusion. The leading order contribution
to the differential cross section, with respect to virtual photon-proton center
of mass energy W and transferred four-momentum squared Q^2, is written as the
sum of two terms related to a colour singlet and a colour octet c \bar{c} pair
production respectively. This expression contains two-gluons contributions and
depends on three parameters; two of them are related to the hadronization
fractions in charmonium states for the c \bar{c} pair (colour singlet and
colour octet), while the third parameter takes into accout possible
``hot-spot'' effects. The values of these parameters are estimated by mean of a
fit to the experimental data collected by H1 collaboration at HERA. By using
different gluon densities, different sets of parameters are obtained, always
with good fits.


title:
Neutrinoless Double Beta Decay from Singlet Neutrinos in Extra
  Dimensions

abstract:
  We study the model-building conditions under which a sizeable
$0\nu\beta\beta$-decay signal to the recently reported level of~0.4 eV is due
to Kaluza--Klein singlet neutrinos in theories with large extra dimensions. Our
analysis is based on 5-dimensional singlet-neutrino models compactified on an
$S^1/Z_2$ orbifold, where the Standard--Model fields are localized on a
3-brane. We show that a successful interpretation of a positive signal within
the above minimal 5-dimensional framework would require a non-vanishing shift
of the 3-brane from the orbifold fixed points by an amount smaller than the
typical scale (100 MeV)$^{-1}$ characterizing the Fermi nuclear momentum. The
resulting 5-dimensional models predict a sizeable effective Majorana-neutrino
mass that could be several orders of magnitude larger than the light neutrino
masses. Most interestingly, the brane-shifted models with only one bulk sterile
neutrino also predict novel trigonometric textures leading to mass scenarios
with hierarchical active neutrinos and large $\nu_\mu$-$\nu_\tau$ and
$\nu_e$-$\nu_\mu$ mixings that can fully explain the current atmospheric and
solar neutrino data.


title: Flavor Symmetry Breaking and Strangeness in the Nucleon

abstract:
  We suggest that breaking of SU(3) flavor symmetry mainly resides in the
baryon wave--functions while the charge operators have no (or only small)
explicit symmetry breaking components. We utilize the collective coordinate
approach to chiral soliton models to support this picture. In particular we
compute the $g_A/g_V$ ratios for hyperon beta--decay and the strangeness
contribution to the nucleon axial current matrix elements and analyze their
variation with increasing flavor symmetry breaking.


title: Meson mass spectrum and OPE: matching to the large-N_c QCD

abstract:
  The relations between masses and decay constants of variety of meson
resonances in the energy range 0--3 GeV are verified from the string-like,
linear mass spectrum for vector, axial-vector, scalar and pseudoscalar mesons
with a universal slope. The way to match the universality with the Operator
Product Expansion (OPE) is proposed. The necessity of small deviations from
linearity in parameterization of the meson mass spectrum and their decay
constants is proven from matching to OPE.


title: Democratic (S)fermions and Lepton Flavor Violation

abstract:
  The democratic approach to account for fermion masses and mixing is known to
be successful not only in the quark sector but also in the lepton sector. Here
we extend this ansatz to supersymmetric standard models, in which the K\"ahler
potential obeys underlying S_3 flavor symmetries. The requirement of neutrino
bi-large mixing angles constrains the form of the K\"ahler potential for
left-handed lepton multiplets. We find that right-handed sleptons can have
non-degenerate masses and flavor mixing, while left-handed sleptons are argued
to have universal and hence flavor-blind masses. This mass pattern is testable
in future collider experiments when superparticle masses will be measured
precisely. Lepton flavor violation arises in this scenario. In particular, \mu
\to e \gamma is expected to be observed in a planning future experiment if
supersymmetry breaking scale is close to the weak scale.


title: Threshold Effects in Charm Hadroproduction

abstract:
  We describe calculations of $c \bar c$ production to next-to-next-to-leading
order (NNLO) and next-to-next-to-leading logarithm (NNLL) near threshold in
$pp$ and $\pi^- p$ interactions. We study the relevance of these calculations
for existing $c \bar c$ total cross section data by examining their sensitivity
to partonic threshold kinematics, their convergence properties and scale
dependence.


title: From Wigner's Supermultiplet Theory to Quantum Chromodynamics

abstract:
  The breadth of Eugene Wigner's interests and contributions is amazing and
humbling. At different times in his life he did seminal work in areas as
diverse as pure mathematics and chemical engineering. His seminal research in
physics is, of course, the best known. In this talk I first describe Wigner's
supermultiplet theory of 1936 using the approximate symmetry of the nuclear
Hamiltonian under a combined spin-isospin symmetry to describe the spectroscopy
of stable nuclei up to about the nucleus molybdenum. I then show how Wigner's
ideas of 1936 have had far reaching and unexpected implications: his ideas led
to the discovery of the color degree of freedom for quarks and to the symmetric
quark model of baryons which is the basis of baryon spectroscopy. I conclude by
pointing out that the color degree of freedom, made into a local symmetry using
Yang-Mills theory, leads to the gauge theory of color, quantum chromodynamics,
which is our present theory of the strong interactions.


title:
Power-Like Threshold Corrections to Gauge Unification in Extra
  Dimensions

abstract:
  One of the much-debated novel features of theories with extra dimensions is
the presence of power-like loop corrections to gauge coupling unification,
which have the potential of allowing a significant reduction of the unification
scale. A recognized problem of such scenarios is the UV sensitivity of the
above power corrections. We consider situations where the grand unified group
is broken by the vacuum expectation value of a bulk field and find that,
because of the softness of this extra-dimensional symmetry breaking mechanism,
power-like threshold corrections are calculable and generic in many of the most
relevant settings. While the precision is limited by the presence of
higher-dimension bulk operators, the most dangerous of these operators are
naturally forbidden by symmetries of the bulk theory. Particularly interesting
and constrained scenarios arise in the context of higher-dimensional
supersymmetry. Our phenomenological exploration of SU(5) models in 5d, linked
in particular with more recently discussed orbifold GUT models, shows promising
results.


title: High Density QCD, Saturation and Diffractive DIS

abstract:
  We review a consistent description of the fusion and saturation of partons in
the Lorentz-contracted ultrarelativistic nuclei in terms of a nuclear
attenuation of color dipole states of the photon and collective
Weizs\"acker-Williams (WW) gluon structure function of a nucleus. Diffractive
DIS provides a basis for the definition of the WW nuclear glue. The point that
all observables for DIS off nuclei are uniquely calculable in terms of the
nuclear WW glue amounts to a new form of factorization in the saturation
regime.


title:
Possible explanation of the discrepancy of the light-cone QCD sum rule
  calculation of g(D*Dpi) coupling with experiment

abstract:
  The introduction of an explicit negative radial excitation contribution in
the hadronic side of the light cone QCD sum rule (LCSR) of Belyaev, Braun,
Khodjamirian and Ruckl, can explain the large experimental value of g(D*Dpi),
recently measured by CLEO. At the same time, it considerably improves the
stability of the sum rule when varying the Borel parameter.


title:
The QCD Pomeron in Ultraperipheral Heavy Ion Collisions: I. The Double
  J/Psi Production

abstract:
  The contribution of the QCD Pomeron to the process AA -> AA J/Psi J/Psi is
discussed. We focus on the photon-photon collision, with the quasi-real photon
coming from the Weizsacker - Williams spectrum of the nuclei. We calculate the
cross section for this process considering the solution of the LLA BFKL
equation at zero momentum transfer using a small-t approximation for the
differential cross section of the subprocess. Furthermore, the impact of
non-leading corrections to the BFKL equation is also analyzed. In both cases
the cross section is found to increase with the energy, predicting considerable
values for the LHC energies. Moreover, we compare our results with the Born
two-gluon approximation, which is energy independent at the photon level. Our
results indicate that the experimental analyzes of this process can be useful
to discriminate the QCD dynamics at high energies.


title: Quasi-particle model for deconfined matter

abstract:
  Our quasi-particle model for deconfined matter near T_c is reviewed. The
extrapolation of lattice QCD data to a finite baryo-chemical potential is
discussed. Determined by the chiral transition temperature T_c, the resulting
equation of state of neutral and beta-stable deconfined matter is soft and
limits size and mass of pure quark stars.


title: Atmospheric Neutrinos Can Make Beauty Strange

abstract:
  The large observed mixing angle in atmospheric neutrinos, coupled with Grand
Unification, motivates the search for a large mixing between right-handed
strange and bottom squarks. Such mixing does not appear in the standard CKM
phenomenology, but may induce significant b to s transitions through gluino
diagrams. Working in the mass eigenbasis, we show quantitatively that an order
one effect on CP violation in B_d to phi+K_S is possible due to a large mixing
between right-handed b and s squarks, while still satisfying constraints from b
to s + gamma. We also include the effect of right- and left-handed bottom
squark mixing proportional to m_b*mu*tan(beta). For small mu*tan(beta) there
may also be a large effect in B_s mixing correlated with a large effect in B_d
to phi+K_S, typically mixing effects are greater than 100 ps^{-1}, an
unambiguous signal of new physics at Tevatron Run II.


title: e^+ e^- Annihilation into J/psi + J/psi

abstract:
  Recent measurements by the Belle Collaboration of the exclusive production of
two charmonia in e^+ e^- annihilation differ substantially from theoretical
predictions. We suggest that a significant part of the discrepancy can be
explained by the process e^+ e^- -> J/psi + J/psi. Because the J/psi + J/psi
production process can proceed through fragmentation of two virtual photons
into two cc-bar pairs, its cross section may be larger than that for J/psi
+eta_c by about a factor 1.8, in spite of a suppression factor
alpha^2/alpha_s^2 that is associated with the QED and QCD coupling constants.


title:
Relativistic Quark Model Calculation of the l1, l2 Coefficients of the
  Chiral Lagrangian

abstract:
  We briefly report on a relativistic quark model scheme to calculate the
O(P^4) pion-pion vertex in the planar approximation and in the chiral limit.
The calculation is reduced to the solution of simple integral equations
(Bethe-Salpeter like) by an effective use of chiral Ward Identities. Specific
model computations are provided.


title: Rho and Sigma Mesons in Unitarized Thermal ChPT

abstract:
  We present our recent results for the rho and sigma mesons considered as
resonances in pion-pion scattering in a thermal bath. We use chiral
perturbation theory to fourth order in p for the low energy behaviour, then
extend the analysis via the unitarization method of the Inverse Amplitude into
the resonance region. The width of the rho broadens about twice the amount
required by phase space considerations alone, its mass staying practically
constant up to temperatures of order 150 MeV. The sigma meson behaves in
accordance to chiral symmetry restoration expectations.


title: Correlations between <p_T> and Multiplicity in a Single BFKL Pomeron

abstract:
  Strong correlations are obtained between the number and the average
transverse momentum of jets emitted by the exchange of a single BFKL Pomeron.


title: Symmetry Breaking and Time Variation of the QCD Coupling

abstract:
  Astrophysical indications that the fine structure constant has undergone a
small time variation during the cosmological evolution are discussed within the
framework of the standard model of the electroweak and strong interactions and
of grand unification. A variation of the electromagnetic coupling constant
could either be generated by a corresponding time variation of the unified
coupling constant or by a time variation of the unification scale, of by both.
The various possibilities, differing substantially in their implications for
the variation of low energy physics parameters like the nuclear mass scale, are
discussed. The case in which the variation is caused by a time variation of the
unification scale is of special interest. It is supported in addition by recent
hints towards a time change of the proton-electron mass ratio.


title: Radiative rho --> eta gamma decay in light cone QCD

abstract:
  The coupling constant of rho --> eta gamma decay is calculated in the
framework of light cone QCD sum rules. A comparison of our prediction on the
coupling constant with the result obtained from analysis of the experimental
data is performed.


title: Explicit generating functional for pions and virtual photons

abstract:
  We construct the explicit one-loop functional of chiral perturbation theory
for two light flavours, including virtual photons. We stick to contributions
where 1 or 2 mesons and at most one photon are running in the loops. With the
explicit functional at hand, the evaluation of the relevant Green functions
boils down to performing traces over the flavour matrices. For illustration, we
work out the pi+ pi- -> pi0 pi0 scattering amplitude at threshold at order p^4,
e^2p^2.


title: Angular Distribution of Particle Flows and Perturbative QCD Predictions

abstract:
  We discuss the predictions of perturbative QCD for angular flows of final
state particles in two and three jet events including their cms energy and jet
resolution (y_{cut}) dependence. The simple analytical formulae for gluon
bremsstrahlung from primary partons, modified for gluon cascading, reproduce
the main features of the experimental data well. For y_{cut}-selected events,
the particle flow is derived from a superposition of colour dipoles in much the
same way that photon radiation is derived from electric dipoles.


title:
Nucleon electromagnetic and axial form factors in point-form
  relativistic quantum mechanics

abstract:
  Results for the proton and neutron electric and magnetic form factors as well
as the nucleon axial form factor are presented for constituent quark models,
based on either one-gluon-exchange and Goldstone-boson-exchange dynamics. The
calculations are performed in a covariant framework using the point-form
approach to relativistic quantum mechanics. The only input to the calculations
is the nucleon wave function of the corresponding constituent quark model. A
comparison is given to results of the instanton-induced constituent quark model
treated with the Bethe-Salpeter equation.