title: QCD coupling constant value and deep inelastic measurements

abstract:
  We reanalyze deep inelastic scattering data of BCDMS Collaboration by
including proper cuts of ranges with large systematic errors. We perform also
the fits of high statistic deep inelastic scattering data of BCDMS, SLAC, NM
and BFP Collaborations taking the data separately and in combined way and find
good agreement between these analyses. We extract the values of the QCD
coupling constant \alpha_s(M^2_Z) up to NLO level.


title:
General solution of asymptotic conditions for electromagnetic form
  factors of hadrons represented by VMD model

abstract:
  General solution of asymptotic conditions, derived previously for n
vector-meson parametrization of electromagnetic form factor of any strongly
interacting particle with asymptotics 1/t^m (m<n) and combined with a form
factor normalization condition, is presented. The special case of m=n and the
solution of asymptotic conditions without any form factor normalization are
discussed too.


title: Pomeron-Odderon interference effects in electroproduction of two pions

abstract:
  We study Pomeron-Odderon interference effects giving rise to charge and
single-spin asymmetries in diffractive electroproduction of a pi+ pi- pair. We
calculate these asymmetries originating from both longitudinal and transverse
polarizations of the virtual photon in the framework of QCD and in the Born
approximation, in a kinematical domain accessible to HERA experiments. We
predict a sizable charge asymmetry with a characteristic dependence on the
invariant mass of the pi+ pi- pair, which makes this observable very important
for establishing the magnitude of the Odderon exchange in hard processes. The
single spin asymmetry turns out to be rather small. We briefly discuss future
improvements of our calculations and their possible effects on the results.


title: Strange nucleon form factors in the perturbative chiral quark model

abstract:
  We apply the perturbative chiral quark model at one loop to calculate the
strange form factors of the nucleon. A detailed numerical analysis of the
strange magnetic moments and radii of the nucleon, and also the momentum
dependence of the form factors is presented.


title:
The contribution of off-shell gluons to the longitudinal structure
  function F_L

abstract:
  We present results for the structure function F_L for a gluon target having
nonzero transverse momentum square at order \alpha_s. The results of double
convolution (with respect to Bjorken variable x and the transverse momentum) of
the perturbative part and the unintegrated gluon densities are compared with
recent experimental data for F_L at low x values and with predictions of other
approaches.


title:
Constraining neutrino oscillation parameters with current solar and
  atmospheric data

abstract:
  We analyze the impact of recent solar, atmospheric and reactor data in the
determination of the neutrino oscillation parameters, taking into account that
both the solar nu_e and the atmospheric nu_mu may convert to a mixture of
active and sterile neutrinos. We use the most recent global solar neutrino
data, including the 1496-day Super-K neutrino data sample, and we investigate
in detail the impact of the SNO neutral current, spectral and day/night data by
performing also an analysis using only the charged current rate from SNO. The
implications of the first 145.1 days of KamLAND data on the determination of
the solar neutrino parameters are also discussed in detail. We confirm the
clear preference of solar+reactor data for the pure active LMA-MSW solution of
the solar neutrino problem, and obtain that the LOW, VAC, SMA and Just-So^2
solutions are disfavored with a Delta_chi^2 = 22, 22, 36, 44, respectively.
Furthermore, we find that the global solar data constrains the admixture of a
sterile neutrino to be less than 43% at 99% CL. By performing an improved fit
of the atmospheric data, we also update the corresponding regions of
oscillation parameters. We find that the recent atmospheric Super-K (1489-day)
and MACRO data have a strong impact on constraining a sterile component in
atmospheric oscillations: if the nu_mu is restricted to the atmospheric mass
states only a sterile admixture of 16% is allowed at 99% CL, while a bound of
35% is obtained in the unconstrained case. Pure sterile oscillations are
disfavored with a Delta_chi^2 = 34.6 compared to the pure active case.


title:
Recent results from the QCD factorization approach to non-leptonic B
  decays

abstract:
  In this talk I report recent results on hadronic B decays obtained with the
QCD factorization approach. In the first part I update the fit of the
Wolfenstein parameters (\bar\rho,\bar\eta) to CP-averaged B -> pi pi, pi K
branching fractions, and give the correlation between the time-dependent and
direct CP asymmetry in B_d -> pi^+pi^- decay. In the second part I present an
investigation of B decays into final states containing an eta or eta^\prime
meson. I discuss the new theoretical issues that arise for flavour singlet
mesons and present preliminary numerical results that appear to reproduce the
pattern of experimental data reasonably well.


title:
One-loop corrections to the seesaw mechanism in the multi-Higgs-doublet
  Standard Model

abstract:
  We consider the lepton sector of the Standard Model and allow for an
arbitrary number of Higgs doublets and, moreover, for the presence of
right-handed neutrino singlets which enable the seesaw mechanism. In this
framework, we identify and calculate the dominant one-loop radiative
corrections to the tree-level mass matrix of the light neutrinos. The
interesting feature is that both the tree-level and the one-loop contributions
to the light-neutrino mass matrix are quadratic in the Yukawa couplings, with
the effect that the one-loop contribution is smaller than the tree-level one
mainly because of the one-loop factor $(16\pi^2)^{-1}$. We also point out the
possibility of generating radiatively--in this framework--the ratio of solar
over atmospheric neutrino mass-squared differences, as needed for the
large-mixing-angle MSW solution of the solar-neutrino problem.


title:
Polynomiality of unpolarized off-forward distribution functions and the
  D-term in the chiral quark-soliton model

abstract:
  Mellin moments of off-forward distribution functions are even polynomials of
the skewedness parameter. This constraint, called polynomiality property,
follows from Lorentz- and time-reversal invariance. We prove that the
unpolarized off-forward distribution functions in the chiral quark-soliton
model satisfy the polynomiality property. The proof is an important
contribution to the demonstration that the description of off-forward
distribution functions in the model is consistent. As a byproduct of the proof
we derive explicit model expressions for moments of the D-term and compute the
first coefficient in the Gegenbauer expansion for this term.


title: Anomalous U(1): Solving Various Puzzles Of MSSM And SU(5) GUT

abstract:
  We discuss how an anomalous U(1) symmetry when appended to MSSM and SUSY GUTs
[e.g. SU(5)] can help overcome a variety of puzzles related to charged fermion
masses and mixings, flavor changing processes, proton decay and neutrino
oscillations. Proton lifetime for SU(5) GUT, in particular, is predicted in a
range accessible to the ongoing or planned searches.


title: Cosmological Constant, Gauge Hierarchy and Warped Geometry

abstract:
  It is suggested that the mechanism responsible for the resolution of the
gauge hierarchy problem within the warped geometry framework can be generalized
to provide a new explanation of the extremely tiny vacuum energy density rho_V
suggested by recent observations. We illustrate the mechanism with some 5D
examples in which the true vacuum energy is assumed to vanish, and rho_V is
associated with a false vacuum energy such that rho_V^{1/4} ~ TeV^2/M_{Pl} ~
10^{-3} eV, where M_{Pl} denotes the reduced Planck mass. We also consider a
quintessence-like solution to the dark energy problem.


title: Spin Structure Functions in Chiral Quark Soliton Models

abstract:
  In this talk I review studies of hadron structure functions in bosonized
chiral quark models. Such models require regularization and I show that the
two--fold Pauli--Villars regularization scheme not only fully regularizes the
effective action but also leads the scaling laws for structure functions. This
scheme is consistent with other computations of the pion structure function in
that model. For the nucleon structure functions the present approach serves to
determine the regularization prescription for structure functions whose leading
moments are not given by matrix elements of local operators. Some numerical
results are presented for the spin structure functions and the role of strange
quarks is addressed.


title: Neutrinos in Supersymmetry without R-Parity

abstract:
  We show how Bilinear R-Parity violation within the Minimal Supersymmetric
Standard Model can solve the atmospheric and solar neutrino problems by
generating naturally small and hierarchical neutrino masses, together with
neutrino mixing angles consistent with experiments. The relation between
collider and neutrino physics is emphasized.


title: Light Gluino and the Running of alpha_s

abstract:
  A gluino in the mass range 12--16 GeV combined with a light (2--5.5 GeV)
bottom squark, as has been proposed recently to explain an excess of b quark
hadroproduction, would affect the momentum-scale dependence (``running'') of
the strong coupling constant alpha_s in such a way as to raise its value at M_Z
by about 0.014 +/- 0.001. If one combines sources of uncertainty at low (m_b)
and high (M_Z) mass scales, one can only distinguish such an effect at slightly
more than the 2 sigma level. Prospects for improvement in this situation, which
include better lattice QCD simulations and better measurements at M_Z, are
discussed.


title: Leptogenesis without CP Violation at Low Energies

abstract:
  In this letter we give a class of examples where the decays of the heavy
Majorana neutrinos may violate CP even if there is no CP violation at low
energies, i.e., leptogenesis can take place without Majorana or Dirac type CP
phases at low energies.


title:
QCD moment sum rules for Coulomb systems: the charm and bottom quark
  masses

abstract:
  In this work the charm and bottom quark masses are determined from QCD moment
sum rules for the charmonium and upsilon systems. To illustrate the special
character of these sum rules when applied to Coulomb systems we first set up
and study the behaviour of the sum rules in quantum mechanics. In our analysis
we include both the results from nonrelativistic QCD and perturbation theory at
next-next-to-leading order. The moments are evaluated at different values of
q^2 which correspond to different relative influence among the theoretical
contributions. In the numerical analysis we obtain the masses by choosing
central values for all input parameters. The error is estimated from a
variation of these parameters. First, the analysis is performed in the pole
mass scheme. Second, we employ the potential-subtracted mass in intermediate
steps of the calculation to then infer the quark masses in the MS-scheme. Our
final results for the pole- and MS-masses are: M_c = 1.75 \pm 0.15 GeV,
m_c(m_c) = 1.19 \pm 0.11 GeV, M_b = 4.98 \pm 0.125 GeV and m_b(m_b) = 4.24 \pm
0.10 GeV.


title: Tomography of the Earth's Core Using Supernova Neutrinos

abstract:
  We investigate the possibility to use the neutrinos coming from a future
galactic supernova explosion to perform neutrino oscillation tomography of the
Earth's core. We propose to use existing or planned detectors, resulting in an
additional payoff. Provided that all of the discussed uncertainties can be
reduced as expected, we find that the average matter densities of the Earth's
inner and outer cores could be measured with a precision competitive with
geophysics. However, since seismic waves are more sensitive to matter density
jumps than average matter densities, neutrino physics would give partly
complementary information.


title: Investigation of next-to-leading effects in CCFM

abstract:
  The effect of formally next-to-leading contributions to the CCFM evolution
equation are discussed.


title:
Discovery Potential for Doubly Charged Higgs Bosons in e^+e^- Collisions
  at LEP

abstract:
  We study the discovery limits for doubly charged Higgs bosons, Delta^{--},
obtainable at the LEP e^+e^- collider. We expect that the LEP2 collaborations
can rule out the existence of a doubly charged Higgs boson of mass below about
190 GeV for Yukawa couplings greater than 0.1. However, even for larger values
of M_Delta, evidence for the Delta can be seen due to contributions from
virtual intermediate Delta's provided they have relatively large values of the
Yukawa couplings.


title:
Correlation between Delta M_s and B^0_{s,d} --> mu^+ mu^- in
  Supersymmetry at Large tan beta

abstract:
  Considering the MSSM with the CKM matrix as the only source of flavour
violation and heavy supersymmetric particles at large $\tan\beta$, we analyze
the correlation between {\it the increase} of the rates of the decays
$B^0_{s,d}\to \mu^+\mu^-$ and {\it the suppression} of $\Delta M_s$, that are
caused by the enhanced flavour changing neutral Higgs couplings to down-type
quarks. We give analytic formulae for the neutral and charged Higgs couplings
to quarks including large $\tan\beta$ resummed corrections in the $SU(2)\times
U(1)$ limit and comment briefly on the accuracy of this approximation. For
$0.8\le (\Delta M_s)^{\rm exp}/(\Delta M_s)^{\rm SM}\le 0.95$ we find $6\cdot
10^{-7}\ge BR(B^0_s\ra \mu^+\mu^-)^{\rm max} \ge 4\cdot 10^{-8}$ and $1.4\cdot
10^{-8}\ge BR(B^0_d\ra \mu^+\mu^-)^{\rm max}\ge 1\cdot 10^{-9}$. For $(\Delta
M_s)^{\rm exp} \ge (\Delta M_s)^{\rm SM}$ substantial enhancements of
$B^0_{s,d}\ra\mu^+\mu^-$ relative to the expectations based on the Standard
Model are excluded. With $(\Delta M_s)^{\rm exp}>15.0/$ps a conservative
analysis of $(\Delta M_s)^{\rm SM}$ gives $BR(B^0_s\ra
\mu^+\mu^-)\simlt1.2\cdot10^{-6}$ and $BR(B^0_d\ra
\mu^+\mu^-)\simlt3\cdot10^{-8}$. However, we point out that in the less likely
scenario in which the squark mixing is so large that the neutral Higgs
contributions dominate $\Delta M_s$, the rates for $B^0_{s,d}\to \mu^+\mu^-$
increase with increasing $\Delta M_s$ and the bounds in question are weaker.
Violation of all these correlations and bounds would indicate new sources of
flavour violation.


title: Supersymmetry (at large tan beta) and flavour physics

abstract:
  Recent development in exploring flavour dynamics in the supersymmetric
extension of the Standard Model is reviewed. Emphasis is put on possible
interesting effects in b-physics arising for large values of tan beta both in
the case of minimal flavour violation and in the case of flavour violation
originating in the sfermion sector. The importance of the flavour changing
neutral Higgs boson couplings generated by the scalar penguin diagrams and
their role in the interplay of neutral B-meson mixing and B^0_{d,s} --> mu^+
mu^- decays is discussed. It is pointed out that observation of the B^0_d -->
mu^+ mu^- decay with BR at the level $\simgt 3 X 10^{-8}$ would be a strong
indication of nonminimal flavour violation in the quark sector. Possible impact
of flavour violation in the slepton sector on neutrino physics is also
discussed.


title: Little Higgses from an Antisymmetric Condensate

abstract:
  We construct an SU(6)/Sp(6) non-linear sigma model in which the Higgses arise
as pseudo-Goldstone bosons. There are two Higgs doublets whose masses have no
one-loop quadratic sensitivity to the cutoff of the effective theory, which can
be at around 10 TeV. The Higgs potential is generated by gauge and Yukawa
interactions, and is distinctly different from that of the minimal
supersymmetric standard model. At the TeV scale, the new bosonic degrees of
freedom are a single neutral complex scalar and a second copy of SU(2)xU(1)
gauge bosons. Additional vector-like pairs of colored fermions are also
present.


title: New shifted hybrid inflation

abstract:
  A new shifted hybrid inflationary scenario is introduced which, in contrast
to the older one, relies only on renormalizable superpotential terms. This
scenario is automatically realized in a concrete extension of the "minimal"
supersymmetric Pati-Salam model which naturally leads to a moderate violation
of Yukawa unification so that, for mu>0, the predicted b-quark mass is
acceptable even with universal boundary conditions. It is shown that this
extended model possesses a classically flat "shifted" trajectory which acquires
a slope via one-loop radiative corrections and can be used as inflationary
path. The constraints from the cosmic background explorer can be met with
natural values of the relevant parameters. Also, there is no disastrous
production of magnetic monopoles after inflation since the Pati-Salam gauge
group is already broken on the "shifted" path. The relevant part of inflation
takes place at values of the inflaton field which are not much smaller than the
"reduced" Planck scale and, thus, supergravity corrections could easily
invalidate inflation. It is, however, shown that inflation can be kept intact
provided that an extra gauge singlet with a superheavy vacuum expectation
value, which originates from D-terms, is introduced and a specific form of the
Kaehler potential is used. Moreover, it is found that, although the
supergravity corrections are sizable, the constraints from the cosmic
background explorer can again be met by readjusting the values of the
parameters which were obtained with global supersymmetry.


title: Radiative Upsilon Decay at the Endpoint

abstract:
  The standard NRQCD power counting breaks down and the OPE gives rise to
color-octet shape functions at the upper endpoint of the photon energy spectrum
in radiative Upsilon decay. Also in this kinematic regime, large Sudakov
logarithms appear in the octet Wilson coefficients, ruining the perturbative
expansion. Using SCET, the octet shape functions arise naturally and the
Sudakov logarithms can be summed using the renormalization group equations. We
derive an expression for the resummed octet energy spectrum.


title: Stabilization of the Electroweak Z String in the Early Universe

abstract:
  The standard electroweak theory admits a string solution, the Z string, in
which only the electrically neutral Higgs fields are excited. This solution is
unstable at zero temperature: Z strings decay by exciting charged Higgs modes.
In the early Universe, however, there was a long period during which the Higgs
particles were out of equilibrium but the photon field was in thermal
equilibrium. We show that in this phase Z strings are stabilized by
interactions of the charged Higgs modes with the photons. In a first
temperature range immediately below the electroweak symmetry breaking scale,
the stabilized embedded defects are symmetric in internal space (the charged
scalar fields are not excited). There is a second critical temperature below
which the stabilized embedded strings undergo a core phase transition and the
charged scalar fields take on a nonvanishing value in the core of the strings.
We show that stabilized embedded defects with an asymmetric core persist to
very low temperatures. The stabilization mechanism discussed in this paper is a
prototypical example of a process which will apply to a wider class of embedded
defects in gauge theories.


title: QCD Corrections to Resonant Slepton Production in Hadron Colliders

abstract:
  We consider resonant production of sneutrino and slepton at hadronic
colliders such as the Tevatron and the LHC within the context of a R-parity
violating supersymmetric model. We present next to leading order QCD
corrections to total cross sections which originate from both quark- as well as
gluon-initiated processes. For couplings involving only the first generation
quarks, the K factor at the Tevatron can be as large as 1.5 for a 100 GeV
sfermion and falls to nearly 1.1 as the sfermion mass reaches 1 TeV. At the
LHC, the variation is between 1.2 and 1.45 for masses less than 2 TeV. While
the dependence on the parton density parametrization is found to be mild, this
ceases to be true if the strange quark plays a dominant role in the production
process. We also study the renormalization and factorization-scale dependence
and find it to be less pronounced for the NLO cros sections as compared to the
LO. The results obtained in this article are also applicable to resonant
production of any color-neutral scalar.


title: Measuring R-parity-violating couplings in dilepton production at the LHC

abstract:
  We revisit the issue of probing R-violating couplings of supersymmetric
theories at hadronic colliders, particularly at the LHC. Concentrating on
dimuon production, an evaluation of the optimal sensitivity to the R-violating
coupling is performed through a maximum likelihood analysis. The measurement
uncertainties are evaluated through a study of fully generated events processed
through a fast simulation of the ATLAS detector. It is found that a host of
R-violating couplings can be measured to a statistical accuracy of better than
10%, over a significant part of the m_{tilde f} -- lambda parameter space still
allowed by low energy measurements. Since the bounds thus obtained do not
simply scale as the squark mass, one can do significantly better at the LHC
than at the Tevatron. The same analysis can also be extended to assess the
reach of the LHC to effects due to any non-SM structure of the four-fermion
amplitude, caused by exchanges of new particles with different spins such as
leptoquarks and gravitons that are suggested by various theoretical ideas.


title: New bound on penguin pollution in B^0(t) --> pi^+ pi^-

abstract:
  In the presence of penguin contributions, the indirect CP asymmetry in B^0(t)
--> pi^+ pi^- measures sin 2alpha_{eff}, where alpha_{eff} deviates from the
true value of the CKM phase alpha by an amount theta, i.e. alpha_{eff} = alpha
+ theta. Using the measured value of direct CP asymmetry in B^0(t) --> pi^+
pi^-, we derive new bound on |2 theta|.


title: Polarized Deep Inelastic Diffractive Scattering near the Light Cone

abstract:
  Polarized inclusive deep-inelastic scattering is formulated in the light cone
expansion. The QCD evolution of the leading twist distribution functions is
derived. It is shown that the twist--2 contribution to the structure functions
g_2^{D(3)} is obtained via g_1^{D(3)} by a Wandzura--Wilczek relation.


title:
The potential (iz)^m generates real eigenvalues only, under symmetric
  rapid decay conditions

abstract:
  We consider the eigenvalue problems -u"(z) +/- (iz)^m u(z) = lambda u(z), m
>= 3, under every rapid decay boundary condition that is symmetric with respect
to the imaginary axis in the complex z-plane. We prove that the eigenvalues
lambda are all positive real.


title: Bjorken sum rule at low Q^2

abstract:
  A description of the generalized Gerasimov-Drell-Hearn sum rules for proton
and neutron is suggested, using their relation to the Bjorken sum rule. The
results support an earlier conjecture, that the structure function g_T features
a smooth Q^2-dependence, while the structure function g_2 is changing rapidly,
due to the elastic contribution to the Burkhardt-Cottingham sum rule. A
possible violation of this later sum rule is briefly discussed.


title: The Soft-Collinear Effective Theory

abstract:
  In this talk I review an effective field theory that has been developed for
processes with energetic hadrons, referred to as the Soft-Collinear Effective
Theory. After outlining properties of the effective theory I briefly discuss
its application to the processes B -> D pi and B -> Xs gamma.


title:
Cosmic Radiation Constraints on Low String Scale and Extra Dimension
  Cross Sections

abstract:
  The observed interaction energy of cosmic rays with atmospheric nuclei
reaches up to a PeV in the center of mass. We compute nucleon-nucleon and
nucleon-neutrino cross sections for various generic parton cross sections
appearing in string and brane world scenarios for gravity and compare them with
cosmic ray data. Scenarios with effective energy scales in the TeV range and
parton cross sections with linear or stronger growth with the center of mass
energy appear strongly constrained or ruled out. String-inspired scenarios with
infinite-volume extra dimensions may require a fundamental scale above 100 eV
for which they are probably in conflict with gravity on parsec scales.


title:
Chiral and Color-superconducting Phase Transitions with Vector
  Interaction in a Simple Model

abstract:
  We investigate effects of the vector interaction on chiral and color
superconducting (CSC) phase transitions at finite density and temperature in a
simple Nambu-Jona-Lasinio model. It is shown that the repulsive density-density
interaction coming from the vector term, which is present in the effective
chiral models but has been omitted, enhances the competition between the chiral
symmerty breaking (chiSB) and CSC phase transition, and thereby makes the
thermodynamic potential have a shallow minimum over a wide range of values of
the correlated chiral and CSC order parameters. We find that when the vector
coupling is increased, the first order transition between the chiSB and CSC
phases becomes weaker, and the coexisting phase in which both the chiral and
color-gauge symmetry are dynamically broken comes to exisit over a wider range
of the density and temperature. We also show that there can exist two
endpoints, which are tricritical points in the chiral limit, along the critical
line of the first order transition in some range of values of the vector
coupling. Although our analysis is based on a simple model, the nontrivial
interplay between the chiSB and CSC phases induced by the vector interaction is
expected to be a universal phenomenon and might give a clue to understanding
results obtained with two-color QCD on the lattice.


title:
Thermodynamic constraint on the primordial black hole formation in the
  radiation dominated epoch

abstract:
  It has been suggested that the overdense region as a result of
inhomogeneities in the early Universe would have undergone a collapse into the
primordial black holes(PBH). In this work, we discuss a possible constraint on
the PBH formation in the radiation dominated epoch by imposing the generalized
second law of thermodynamics in the context of spherically collapsing scenario.
It is found that both the critical temperature $T_c$ over which the formation
of PBH is not possible and the lower bound on the mass of PBH depend on the
number of degrees of freedom at the time of PBH formation. In the standard
model, one can show that the lower bound on the mass of PBH known in the
literature, of order Planck mass, is consistent with the thermodynamic
constraint constructed in this work. We also pointed out the possibility that
the critical temperature(lower bound on PBH mass) can be lowered(increased)
provided the number of relativistic degrees of freedom of the Universe is
increasing substantially beyond the standard model.


title:
Weak Phase gamma Using Isospin Analysis and Time Dependent Asymmetry in
  B_d -> K_s pi^+ pi^-

abstract:
  We present a method for measuring the weak phase gamma using isospin analysis
of three body B decays into K pi pi channels. Differential decay widths and
time dependent asymmetry in B_d -> K_s pi^+pi^- mode needs to be measured into
even isospin pi pi states. The method can be used to extract gamma, as well as,
the size of the electroweak penguin contributions. The technique is free from
assumptions like SU(3) or neglect of any contributions to the decay amplitudes.
By studying different regions of the Dalitz plot, it is possible to reduce the
ambiguity in the value of gamma.


title: Minimum Of QCD Effective Action As Test Of QCD Confinement Parameter

abstract:
  A new approach to the non-perturbative regime of QCD is proposed by
introducing a (non-hermitian) field $B$ related to the usual gluon field $A$ by
$B_\mu$ = $(1+ \sigma \partial_m) A_\mu$ where $m$ goes to zero after
differentiation, and $\sigma$ is a parameter which `runs' with momentum ($k$).
An exact treatment yields a structure $[1/k^2 + 2\mu^2/k^4]$ for the gluon
propagator, where $\sigma^2$ =$\pi k^4/9\mu^2\alpha_s$, showing $linear$
confinement in the instantaneous limit. This propagator was recently employed
to evaluate some basic condensates and their temperature dependence (in the
cosmological context), which were all reproduced for $\mu = 1GeV$ (termed the
`confinement scale parameter'), in association with the QCD scale parameter
$\Lambda_{qcd}= 200 MeV$ [hep-ph/0109278]. This paper seeks to provide a formal
basis for the ratio $\Lambda_{qcd} / \mu$ by employing the minimality condition
for the $integrated$ effective action $\Gamma$, up to the 2-loop level, using
the Cornwall-Jackiw formalism for composite operators. To that end the mass
function $m(p)$, determined via the Schwinger-Dyson equation (as a zero of the
functional derivative of $\Gamma$ w.r.t $S_F'$), acts as a feeder, and the
stationarity condition on $\Gamma$ as function of $\mu$ and $\alpha_s(\mu)$
gives the ratio $\Lambda /\mu$ = 0.246, in fair accord with the value 0.20
given above. Inclusion of a two-loop $\Gamma$ is crucial for the agreement. \\
Keywords: confinement scale, QCD effective action, minimality condition,
$B$-field.


title:
Universal QED Corrections to Polarized Electron Scattering in Higher
  Orders

abstract:
  We derive QED radiators for the universal corrections to polarized electron
scattering. To 5th order in the coupling constant the flavor non-singlet and
singlet contributions are calculated. We derive the non-singlet and singlet
exponentiation of the leading terms propertional to (alpha ln^2(x))^k to all
orders.


title:
Gamma ray bursts as probes of neutrino mass, quantum gravity and dark
  energy

abstract:
  We calculate the time delays of neutrinos emitted in gamma ray bursts due to
the effects of neutrino mass and quantum gravity using a time dependent Hubble
constant which can significantly change the naive results presented hitherto in
the literature for large redshifts, and gives some sensitivity to the details
of dark energy. We show that the effects of neutrino mass, quantum gravity and
dark energy may be disentangled by using low energy neutrinos to study neutrino
mass, high energy neutrinos to study quantum gravity, and large redshifts to
study dark energy. From low energy neutrinos one may obtain direct limits on
neutrino masses of order 10^{-3} eV, and distinguish a neutrino mass hierarchy
from an inverted mass hierarchy. From ultra-high energy neutrinos the
sensitivity to the scale of quantum gravity can be pushed up to E_{QG} ~ 5
times 10^{30} GeV. By studying neutrinos from GRBs at large redshifts a
cosmological constant could be distinguished from quintessence.


title:
Bjorken unpolarized and polarized sum rules: comparative analysis of
  large-N_F expansions

abstract:
  Analytical all-orders results are presented for the one-renormalon-chain
contributions to the Bjorken unpolarized sum rule for the F_1 structure
function of nu N deep-inelastic scattering in the large-N_F limit. The
feasibility of estimating higher order perturbative QCD corrections, by the
process of naive nonabelianization (NNA), is studied, in anticipation of
measurement of this sum rule at a Neutrino Factory. A comparison is made with
similar estimates obtained for the Bjorken polarized sum rule. Application of
the NNA procedure to correlators of quark vector and scalar currents, in the
euclidean region, is compared with recent analytical results for the
O(alpha_s^4 N_F^2) terms.


title: Hybrid Inflation in Supergravity without Inflaton Superpotential

abstract:
  We propose a new realisation of hybrid inflation in supergravity where the
inflaton field does not appear in the superpotential but contributes only
through the Kahler potential. The scalar potential derived from an R-invariant
superpotential has the same form as that of the Linde's original version. The
correct magnitude of the density perturbations amplitude is found without any
fine-tuning of the coupling parameter in the superpotential for an acceptable
value of the fundamental energy scale of the theory. The eta-problem was also
resolved in this model.


title: Anomalous Magnetic Moment of W-boson at high temperature

abstract:
  By the Schwinger proper-time method, the one-loop contribution to the
anomalous magnetic moment of the W-boson is calculated at high temperature. It
is shown that the value of AMM is positive and depends linearly upon
temperature.


title: Parton Percolation and J/Psi Suppression

abstract:
  The geometric clustering of partons in the transverse plane of nuclear
collisions leads for increasing A or sqrt(s) to percolation. In the resulting
condensate, the partons are deconfined but not yet in thermal equilibrium. We
discuss quarkonium dissociation in this precursor of the quark-gluon plasma,
with an onset of dissociation when the saturation scale of the parton
condensate reaches that of the given quarkonium state.


title:
Perturbative QCD versus pion exchange and hadronic FSI effects in the
  gamma gamma --> pi^+ pi^- reaction

abstract:
  The interplay of pQCD, pion exchange and FSI effects is studied for the gamma
gamma --> pi^+ pi^- reaction in the region of 2 GeV < W_{gamma gamma} < 6 GeV.
We find strong interference effects between pQCD and soft pion-exchange
amplitudes up to W_{gamma gamma} ~ 4 GeV. We discuss to which extend the
conventional hadronic FSI effects could cloud the pQCD effects. We study
multipole soft and hard scattering effects as well as the coupling between
final state hadronic channels. We show how the perturbative effects in gamma
gamma --> rho rho may mix with perturbative effects in gamma gamma --> pi^+
pi^-. The effects discussed in this paper improve the agreement with the new
data of the DELPHI and ALEPH collaborations. We give estimates of the onset of
the pQCD regime. Predictions for gamma gamma --> pi^0 pi^0 are presented.


title:
Pion light-cone wave function and pion distribution amplitude in the
  Nambu-Jona-Lasinio model

abstract:
  We compute the pion light-cone wave function and the pion quark distribution
amplitude in the Nambu-Jona-Lasinio model. We use the Pauli-Villars
regularization method and as a result the distribution amplitude satisfies
proper normalization and crossing properties. In the chiral limit we obtain the
simple results, namely phi_pi(x)=1 for the pion distribution amplitude, and
<k_perp^2> = -M <ubar u> / f_pi^2 for the second moment of the pion light-cone
wave function, where M is the constituent quark mass and f_pi is the pion decay
constant. After the QCD Gegenbauer evolution of the pion distribution amplitude
good end-point behavior is recovered, and a satisfactory agreement with the
analysis of the experimental data from CLEO is achieved. This allows us to
determine the momentum scale corresponding to our model calculation, which is
close to the value Q_0 = 313 MeV obtained earlier from the analogous analysis
of the pion parton distribution function. The value of <k_perp^2> is, after the
QCD evolution, around (400 MeV)^2. In addition, the model predicts a linear
integral relation between the pion distribution amplitude and the parton
distribution function of the pion, which holds at the leading-order QCD
evolution.


title: Level Set Method for the Evolution of Defect and Brane Networks

abstract:
  A theory for studying the dynamic scaling properties of branes and
relativistic topological defect networks is presented. The theory, based on a
relativistic version of the level set method, well-known in other contexts,
possesses self-similar ``scaling'' solutions, for which one can calculate many
quantities of interest. Here, the length and area densities of cosmic strings
and domain walls are calculated in Minkowski space, and radiation, matter, and
curvature-dominated FRW cosmologies with 2 and 3 space dimensions. The scaling
exponents agree the naive ones based on dimensional analysis, except for cosmic
strings in 3-dimensional Minkowski space, which are predicted to have a
logarithmic correction to the naive scaling form. The scaling amplitudes of the
length and area densities are a factor of approximately 2 lower than results
from numerical simulations of classical field theories. An expression for the
length density of strings in the condensed matter literature is corrected.


title:
Conservation of particle multiplicities between chemical and thermal
  freeze-out

abstract:
  The evolution of a hadronic system after its chemical decomposition is
described through a model that conserves the hadronic multiplicities to their
values at chemical freeze-out. In the partition function describing the model
all known hadronic resonances with masses up to 2400 MeV have been included.
The state of the system is found as function of temperature and the
corresponding baryon density is evaluated. The baryon density at thermal
decoupling is also computed.


title: New Signal for Universal Extra Dimensions

abstract:
  In the universal extra dimensions (UED) scenario, the tree level masses of
the first level Kaluza-Klein (KK) excitations of Standard Model particles are
essentially degenerate. Radiative corrections will, however, lift this
degeneracy, allowing the first level excitations to decay to the lightest KK
particle (LKP), which is the gamma^*. KK number conservation implies that the
LKP is stable. Then, since the SM particles radiated during these decays are
rather soft, the observation of KK excitations production and decay in collider
experiments will be quite difficult. We propose to add to this model KK number
violating interactions mediated by gravity, which allow the gamma^* to decay to
a photon and a KK graviton. For a variety a models and a large range of
parameters, these decays will occur within the detector. Thus, pair production
of KK excitations will give rise to a striking collider signal, consisting of
two hard photons plus large missing energy (due to escaping gravitons). We
evaluate the cross-section for these signals at the Tevatron and LHC, and
derive the reach of these colliders in the search for universal extra
dimensions.


title: Triple Photon Production at the Tevatron in Technicolor Models

abstract:
  We study the process p bar{p} --> gamma gamma gamma as a signal for
associated photon-technipion production at the Tevatron. This is a clean
signature with relatively low background. Resonant and non-resonant
contributions are included and we show that technicolor models can be
effectively probed in this mode.


title: Two-loop Renormalization Group Equations in the Standard Model

abstract:
  Two-loop renormalization group equations in the standard model are
re-calculated. A new coefficient is found in the beta-function of the quartic
coupling and a class of gauge invariants are found to be absent in the
beta-functions of hadronic Yukawa couplings. The two-loop beta-function of the
Higgs mass parameter is presented in complete form.


title: Photoproduction of vector mesons in the Soft Dipole Pomeron model

abstract:
  Exclusive photoproduction of all vector mesons by real and virtual photons is
considered in the Soft Dipole Pomeron model. It is emphasized that being the
Pomeron in this model a double Regge pole with intercept equal to one, we are
led to rising cross-sections but the unitarity bounds are not violated. It is
shown that all available data for rho, omega, phi, J/psi and Upsilon in the
region of energies 1.7 <= W <= 250 GeV and photon virtualities 0 <= Q^2 <= 35
GeV^2, including the differential cross-sections in the region of transfer
momenta 0 <= |t| <= 1.6 GeV^2, are well described by the model.


title: Description of $e^-e^+\to\gamma\gamma, Z \gamma, ZZ$ in SM and MSSM

abstract:
  We present a complete analysis of the one loop electroweak corrections to
$e^-e^+\to\gamma\gamma, ~Z\gamma, ~ZZ$ in the Standard (SM) and the Minimal
Supersymmetric Standard Model (MSSM). Analytic expressions are written for the
contributions to the helicity amplitudes. Several observables accessible for
polarized or unpolarized beams and transverse, longitudinal or unpolarized
final states are computed. We show that in the few hundred GeV region, these
observables provide a test of the various SM or MSSM components. For the
dominant TT amplitude at high energy, the sensitivity to the details of the
various sectors disappears, but the energy dependence fixed by leading
logarithmic contributions, provides a model independent signature
discriminating SM from MSSM. Subdominant TL or LL amplitudes though, remain
sensitive to the details of the SM or MSSM sectors. Numerical illustrations are
given for energies up to several TeV. The analysis may also be used to search
for new physics characterized by anomalously strong interactions among the
neutral gauge bosons.


title: Electron in the Ultrashort Laser Pulse

abstract:
  After the clasical approach to acceleration of a charged particle by
delta-form impulsive force, we consider the corresponding quantum theory based
on the Volkov solution of the Dirac equation. We determine the modified Compton
formula for frequency of photons generated by the scattering of the delta-form
laser pulse on the electron in a rest.


title: Separation Distribution of Vacuum Bubbles in de Sitter Space

abstract:
  We compute the probability distribution of the invariant separation between
nucleation centers of colliding true vacuum bubbles arising from the decay of a
false de Sitter space vacuum. We find that even in the limit of a very small
nucleation rate per unit Hubble volume the production of widely separated
bubble pairs is suppressed. This distribution is of particular relevance for
the recently proposed ``colliding bubble braneworld'' scenario, in which the
value of Omega_k (the contribution of negative spatial curvature to the
cosmological density parameter) is determined by the invariant separation of
the colliding bubble pair. We also consider the probability of a collision with
a `third' bubble.


title:
Small x behavior of the slope dlnF_2/dln(1/x) in the framework of
  perturbative QCD

abstract:
  Using an analytical parameterization for the behavior of the x slope of the
structure function F_2 at small x in perturbative QCD, at the leading twist
approximation of the Wilson operator product expansion, and applying a flat
initial condition in the DGLAP evolution equations, we found very good
agreement with new precise deep inelastic scattering experimental data from
HERA.


title:
Higgs-Mediated Electric Dipole Moments in the MSSM: An Application to
  Baryogenesis and Higgs Searches

abstract:
  We perform a comprehensive study of the dominant two- and higher-loop
contributions to the $^{205}$Tl, neutron and muon electric dipole moments
induced by Higgs bosons, third-generation quarks and squarks, charginos and
gluinos in the Minimal Supersymmetric Standard Model (MSSM). We find that
strong correlations exist among the contributing CP-violating operators, for
large stop, gluino and chargino phases, and for a wide range of values of
$\tan\beta$ and charged Higgs-boson masses, giving rise to large suppressions
of the $^{205}$Tl and neutron electric dipole moments below their present
experimental limits. Based on this observation, we discuss the constraints that
the non-observation of electric dipole moments imposes on the
radiatively-generated CP-violating Higgs sector and on the mechanism of
electroweak baryogenesis in the MSSM. We improve previously suggested benchmark
scenarios of maximal CP violation for analyzing direct searches of CP-violating
MSSM Higgs bosons at high-energy colliders, and stress the important
complementary r\^ole that a possible high-sensitivity measurement of the muon
electric dipole moment to the level of $10^{-24}$ $e$ cm can play in such
analyses.


title: Testing coupling relations in SUSY-QCD at a Linear Collider

abstract:
  Supersymmetry predicts that gauge couplings are equal to the corresponding
gaugino-sfermion-fermion Yukawa couplings. This prediction can be tested for
the QCD sector of the MSSM by studying the processes eplus+eminus ->
squark+antisquark+gluon and eplus+eminus -> squark+antiquark+gluino at a future
linear collider. We present results for these processes at next-to-leading
order in alpha_s in the framework of the MSSM. We find sizable SUSY-QCD
corrections. The renormalization scale dependence is significantly reduced at
next-to-leading order.


title: Mesons, Quarks and Leptons

abstract:
  The QCD anomaly leads to an abnormal mixing and mass pattern for the
pseudoscalar mesons. Furthermore it is responsible for the quality of isospin
symmetry in the meson spectrum. Similarities between the large mixing angles
among the neutral 0^-+ mesons and the large mixing angles observed in neutrino
oscillations are pointed out.


title: The linear BESS model and the double Higgs-strahlung production

abstract:
  In this paper we evaluate, in the context of the linear BESS model the
cross-section for the double Higgs-strahlung process. We find that, within the
bounds given by the actual experimental data, significant deviations with
respect to the SM may arise. In the linear BESS model not only the
self-couplings of the Higgs are modified, but also the Z-Higgs couplings. We
think that this is a generic feature of any extension of the SM and, in our
opinion, it should be kept in mind in analyzing the future data on the process
studied here.


title:
(beta beta)_{0 nu}-decay: a possible test of the nuclear matrix element
  calculations

abstract:
  The existing calculations of the nuclear matrix elements of the neutrinoless
double beta-decay differ by about a factor three. This uncertainty prevents
quantative interpretation of the results of experiments searching for this
process. We suggest here that the observation of the neutrinoless double
beta-decay of several nuclei in future experiments of could allow to test
different calculations of the nuclear matrix elements through the direct
comparison of them with the experimental data.


title: A "Running" Gravitational Constant?

abstract:
  If the gravitational interaction is unified with the electroweak and strong
interactions at a mass M=10^15 GeV, the evolution of Newton's constant must
differ from its classical (general relativistic) form. We can model such
behavior by introducing an ad hoc dependence on ln(s/4m^2) where s is the usual
cm energy between two protons. We can then predict the observable effects for
relativistic collisions (sqrt(s)~1.4x10^4 GeV) as well as for the case of low
velocity motion (beta^2~10^-5)


title:
An eikonal model for multiparticle production in hadron-hadron
  interactions

abstract:
  We introduce an eikonal Monte Carlo model (running in conjunction with
HERWIG) for simulating multiparticle production in hadron-hadron interactions.
We compare our simulated data to the CDF Tevatron measurement of the underlying
event activity in hard inelastic proton-antiproton scattering at sqrt(s)=1.8
TeV. By fixing the only free parameter in our model, the total hadron-hadron
cross section, we find that our model describes the data better than either the
HERWIG Underlying Event model or the Hard Multiparton model.


title: Very low energy matching of effective meson theories with QCD

abstract:
  A simple matching procedure is proposed to extract constraints on effective
meson theories. In this way, a QCD prediction for the pion decay constant is
found, F(pi)=2 m(pi)/pi, i.e. approximately 90MeV. The same procedure also
determines other mesonic observables, like the decay width of the sigma meson
to two photons. Finally, some information which can be gained about the
hadronic light-by-light contributions to the muon anomalous moment are briefly
commented.


title: Recent Results For Rho And Odderon Picture

abstract: This has critical errors


title:
Some problems when calculating the quantum corrections to the classical
  't Hooft-Polyakov monopole

abstract:
  We examine whether the analysis of quantum corrections for the kink soliton
carries over to the 't Hooft-Polyakov monopole. For the kink, it is central
that the quantum fluctuations are eigenmodes of a Hermitian operator. For the
monopole, we show the analogous operator is not Hermitian. This property raises
some questions about the quantization procedure for a 't Hooft-Polyakov
monopole.


title:
Decomposition of the QCD String into Dipoles and Unintegrated Gluon
  Distributions

abstract:
  We present the perturbative and non-perturbative QCD structure of the
dipole-dipole scattering amplitude in momentum space. The perturbative
contribution is described by two-gluon exchange and the non-perturbative
contribution by the stochastic vacuum model which leads to confinement of the
quark and antiquark in the dipole via a string of color fields. This QCD string
gives important non-perturbative contributions to high-energy reactions. A new
structure different from the perturbative dipole factors is found in the
string-string scattering amplitude. The string can be represented as an
integral over stringless dipoles with a given dipole number density. This
decomposition of the QCD string into dipoles allows us to calculate the
unintegrated gluon distribution of hadrons and photons from the dipole-hadron
and dipole-photon cross section via kT-factorization.


title:
Constraining supersymmetric models from B_d - B-bar_d mixing and the B_d
  --> J/psi K_S asymmetry

abstract:
  We analyze the chargino contributions to B_d - B-bar_d mixing and CP
asymmetry of the B_d --> J/psi K_S decay, in the framework of the mass
insertion approximation. We derive model independent bounds on the relevant
mass insertions. Moreover, we study these contributions in supersymmetric
models with minimal flavor violation, Hermitian flavor structure, and small CP
violating phases and universal strength Yukawa couplings. We show that in
supersymmetric models with large flavor mixing, the observed values of sin(2
beta) may be entirely due to the chargino-up-squark loops.


title:
Radiative processes (tau -> mu gamma, mu -> e gamma and muon g-2) as
  probes of ESSM/SO(10)

abstract:
  The Extended Supersymmetric Standard Model (ESSM), motivated on several
grounds, introduces two vectorlike families (16 + 16-bar) of SO(10)) with
masses of order one TeV. It is noted that the successful predictions of prior
work on fermion masses and mixings, based on MSSM embedded in SO(10), can be
retained rather simply within the ESSM extension. These include an
understanding of the smallness of V_{cb} ~ 0.04 and the largeness of nu_mu -
nu_tau oscillation angle, sin^2 2 theta_{nu_mu nu_tau}^{osc} ~ 1. We analyze
the new contributions arising through the exchange of the vectorlike families
of ESSM to radiative processes including tau -> mu gamma, mu -> e gamma, b -> s
gamma, EDM of the muon and the muon (g-2). We show that ESSM makes significant
contributions especially to the decays tau -> mu gamma and mu -> e gamma and
simultaneously to muon (g-2). For a large and plausible range of relevant
parameters, we obtain: a_mu^{ESSM} ~ +(10-40) times 10^{-10}, with a correlated
prediction that tau -> mu gamma should be discovered with an improvement in its
current limit by a factor of 3-20. The implications for mu -> e gamma are very
similar. The muon EDM is within reach of the next generation experiments. Thus,
ESSM with heavy leptons being lighter than about 700 GeV (say) can be probed
effectively by radiative processes before a direct search for these vectorlike
leptons and quarks is feasible at the LHC.


title:
Fully differential W' production and decay at next-to-leading order in
  QCD

abstract:
  We present the fully differential production and decay of a W' boson, with
arbitrary vector and axial-vector couplings, to any final state at
next-to-leading order in QCD. We demonstrate a complete factorization of
couplings at next-to-leading order in both the partial width of the W' boson,
and in the full two-to-two cross section. We provide numerical predictions for
the contribution of a W' boson to single-top-quark production, and separate
results based on whether the mass of the right-handed neutrino (nu_R) is light
enough for the leptonic decay channel to be open. The single-top-quark analysis
will allow for an improved direct W' mass limit of 525-550 GeV using data from
run I of the Fermilab Tevatron. We propose a modified tolerance method for
estimating parton distribution function uncertainties in cross sections.


title: Resummations of free energy at high temperature

abstract:
  We discuss resummation strategies for free energy in quantum field theories
at nonzero temperatures T. We point out that resummations should be performed
for the short- and long-distance parts separately in order to avoid spurious
interference effects and double-counting. We then discuss and perform Pade
resummations of these two parts for QCD at high T. The resummed results are
almost invariant under variation of the renormalization and factorization
scales. We perform the analysis also in the case of the massless scalar
$\phi^4$ theory.


title: The Glueball Spectrum from a Potential Model

abstract:
  The spectrum of two-gluon glueballs below 3 GeV is investigated in a
potential model with dynamical gluon mass using variational method. The short
distance potential is approximated by one-gluon exchange, while the long
distance part is taken as a breakable string. The mass and size of the radial
as well as orbital excitations up to principle quantum number n=3 are
evaluated. The predicted mass ratios are compared with experimental and lattice
results.


title: Mechanisms of Supersymmetry Breaking in the MSSM

abstract:
  Preliminary Remarks. Gauge mediated supersymmetry breaking. Gravity mediated
supersymmetry breaking. Anomaly mediated supersymmetry breaking. Gaugino
mediated supersymmetry breaking. Braneworld supersymmetry breaking.
Conclusions.


title: Study of the Higgs-boson decays into WW and ZZ at the Photon Collider

abstract:
  Production of the Standard Model Higgs-boson at the Photon Collider at TESLA
is studied for the Higgs-boson masses above 150 GeV. Simulation of signal and
background processes takes into account realistic luminosity spectra and
detector effects. In the considered mass range, large interference effects are
expected in the W+W- decay channel. By reconstructing W+W- and ZZ final states,
not only the h->gamma gamma partial width can be measured, but also the
relative phase of the scattering amplitude. This opens a new window for the
precise determination of the Higgs-boson couplings. Models with heavy,
fourth-generation fermions and with enlarged Higgs sector (2HDM (II)) are
considered.


title: Non-Gaussianity in multi-field inflation

abstract:
  This article investigates the generation of non-Gaussianity during inflation.
In the context of multi-field inflation, we detail a mechanism that can create
significant primordial non-Gaussianities in the adiabatic mode while preserving
the scale invariance of the power spectrum. This mechanism is based on the
generation of non-Gaussian isocurvature fluctuations which are then transfered
to the adiabatic modes through a bend in the classical inflaton trajectory.
Natural realizations involve quartic self-interaction terms for which a full
computation can be performed. The expected statistical properties of the
resulting metric fluctuations are shown to be the superposition of a Gaussian
and a non-Gaussian contribution of the same variance. The relative weight of
these two contributions is related to the total bending in field space. We
explicit the non-Gaussian probability distribution function which appears to be
described by a single new parameter. Only two new parameters therefore suffice
in describing the non-Gaussianity.


title: The BFKL Pomeron within Physical Renormalization Schemes and Scales

abstract:
  In this lecture the next-to-leading order (NLO) corrections to the QCD
Pomeron intercept obtained from the Balitsky-Fadin-Kuraev-Lipatov (BFKL)
equation are discussed. It is shown that the BFKL Pomeron intercept when
evaluated in non-Abelian physical renormalization schemes with
Brodsky-Lepage-Mackenzie (BLM) optimal scale setting does not exhibit the
serious problems encountered in the modified minimal subtraction (bar{MS})
scheme. The results obtained provide an opportunity for applications of the NLO
BFKL resummation to high-energy phenomenology.
  One of such applications for virtual gamma-gamma total cross section shows a
good agreement with preliminary data at CERN LEP.


title: High-Energy QCD Asymptotics of Photon-Photon Collisions

abstract:
  The high-energy behaviour of the total cross section for highly virtual
photons, as predicted by the BFKL equation at next-to-leading order (NLO) in
QCD, is discussed. The NLO BFKL predictions, improved by the BLM optimal scale
setting, are in good agreement with recent OPAL and L3 data at CERN LEP2. NLO
BFKL predictions for future linear colliders are presented.


title: Pomeron in Elastic Scattering

abstract: This paper has been withdrawn by the author due to a crucial errors.


title:
Unintegrated gluon distributions in a photon from the CCFM equation in
  the single loop approximation

abstract:
  The system of CCFM equations for unintegrated parton distributions in a
photon is considered in the single loop approximation. We include quarks and
non-singular parts of the splitting functions in the corresponding evolution
equations. We solve the system of CCFM equations utilising the transverse
coordinate representation which diagonalises these equations in the single loop
approximation. The results for the unintegrated gluon distributions in a photon
are presented and confronted with the approximate form expressing those
distributions in terms of the integrated gluon and quark distributions and a
suitably defined Sudakov-like form factor.


title: QCD Instantons and High-Energy Diffractive Scattering

abstract:
  We pursue the intriguing possibility that larger-size instantons build up
diffractive scattering, with the marked instanton-size scale <rho>
approximately 0.5 fm being reflected in the conspicuous ``geometrization'' of
soft QCD. As an explicit step in this direction, the known instanton-induced
cross sections in deep-inelastic scattering (DIS) are transformed into the
familiar colour dipole picture, which represents an intuitive framework for
investigating the transition from hard to soft physics in DIS at small x_{Bj}.
The simplest instanton (I) process without final-state gluons is studied first.
With the help of lattice results, the q bar{q}-dipole size r is carefully
increased towards hadronic dimensions. Unlike perturbative QCD, one now
observes a competition between two crucial length scales: the dipole size r and
the size rho of the background instanton that is sharply localized around <rho>
approximately 0.5 fm. For r exceeding <rho>, the dipole cross section indeed
saturates towards a geometrical limit, proportional to the area pi <rho>^2,
subtended by the instanton. In case of final-state gluons, lattice data are
crucially used to support the emerging picture and to assert the range of
validity of the underlying I bar{I}-valley approach. As function of an
appropriate energy variable, the resulting dipole cross section turns out to be
sharply peaked at the sphaleron mass in the soft regime. The general
geometrical features remain like in the case without gluons.


title: The General Structure of Matter

abstract:
  General Classification of Matter; Prequarks and Number of Quarks; Structure
of Nucleons; Generation of Quark Masses; Seas and Sizes of Nucleons;
Contributions of Nucleons Seas to the Structure Functions; Higgs Bosons; Bosons
of the
  Strong and Superstrong Interactions; The Nature of Gluons, Super QCD, The
  Energies of Baryons and Mesons; The Sizes of Baryons and Mesons; The
  Confinement Constant at the Top Quark Scale, The Formation and Evolution of
Galaxies; The Formation of Galaxies and Primordial Stars; The Evolution of
Galaxies; The Formation of Structure; The Rotation of Spiral Galaxies;
  The Non Existence of Dark Matter and Black Holes; Associated Fermions and the
Dual Role of Neutrinos; The Hidden Realm of Gravity; The Connection between
Neutrinos and the Superweak Force; The Galactic Medium as a Neutrino
  Gas; Energy Bands of Neutrinos; Another Solution to the Solar Neutrino
Problem; The Stability of the Deuteron, Triton and Alpha Particle; The
  Absence of Nuclides with A=5 and the Instability of Be8.


title:
Search for the lepton flavor violating decay A^0/H^0 --> tau^{+/-}
  mu^{+/-} at hadron colliders

abstract:
  In the two Higgs doublet model type III and in several other extensions of
the Standard Model, there are no discrete symmetries that suppress flavor
changing couplings at tree level. The experimental observation of the nu_mu --
nu_tau flavor oscillation may suggest the non-conservation of lepton number.
This would lead to the decay of the type A^0/H^0 --> tau^{+/-} mu^{+/-}. We
determine the present low energy limit on lepton flavor violating (LFV)
couplings from the muon g-2 measurement and discuss the prospects for detecting
lepton flavor violating decays at the TeVatron and at the Large Hadron
Collider. The achievable bounds on the LFV coupling parameter lambda_{tau mu}
are presented.


title: On the jet spectrum in nucleus-nucleus interactions

abstract:
  We derive the inclusive transverse spectrum of minijets in nuclear collisions
at very high energies by assuming that the nuclear S-matrix factorizes into a
product of elastic S-matrices for elementary partonic collisions. Interference
effects and, in particular, the contribution of loop diagrams are fully taken
into account in the derivation of the spectrum, which is shown to coincide with
the result earlier obtained by superposing the elementary interactions
incoherently. A quantitative analysis confirms that the deformation induced by
multiple collsions is a large effect at RHIC and LHC energies, for transverse
momenta ~ 20 GeV.


title: The Off-diagonal Goldberger-Treiman Relation and Its Discrepancy

abstract:
  We study the off-diagonal Goldberger-Treiman relation (ODGTR) and its
discrepancy (ODGTD) in the N, Delta, pi sector through O(p^2) using heavy
baryon chiral perturbation theory. To this order, the ODGTD and axial vector N
to Delta transition radius are determined solely by low energy constants. Loop
corrections appear at O(p^4). For low-energy constants of natural size, the
ODGTD would represent a ~ 2% correction to the ODGTR. We discuss the
implications of the ODGTR and ODGTD for lattice and quark model calculations of
the transition form factors and for parity-violating electroexcitation of the
Delta.


title: Antishadowing and multiparticle production

abstract:
  We discuss role of absorbtion and antishadowing in particle production.
Antishadowing, which leads to domination of elastic scattering at high
energies, appears to be consistent with growth of mean multiplicity in hadronic
collisions. Moreover, we demonstrate possibility to reproduce power-like energy
behavior of the mean multiplicity in the model with antishadowing and discuss
physical implications of such behavior for the hadron structure.


title: Mass dependence in vector--meson electroproduction

abstract:
  We demonstrate that the explicit mass dependence of the exponent in the
power--like energy behavior of the vector--meson production cross-section in
the processes of virtual photon interactions with a proton gamma^*p --> Vp
obtained in the off--shell extension of the approach based on unitarity is in a
quantitative agreement with the high--energy HERA experimental data.


title: Photon Distribution Amplitudes in QCD

abstract:
  We develop a consistent technique for the calculation of real photon emission
in hard exclusive processes, which is based on the background field formalism
and allows a convenient separation of hard electromagnetic and soft hadronic
components of the photon. The latter ones are related to matrix-elements of
light-cone operators in the electromagnetic background field and can be
parametrized in terms of photon distribution amplitudes. We construct a
complete set of photon distribution amplitudes up to and including twist-4, for
both chirality-conserving and chirality-violating operators. The distribution
amplitudes involve several nonperturbative parameters and, most importantly,
the magnetic susceptibility of the quark condensate. We review and update
previous estimates of the susceptibility and also give new estimates of
parameters describing higher-twist amplitudes from QCD sum rules.


title: Lepton number and lepton flavor violations in seesaw models

abstract:
  We discuss the impact of fermion mass matrices on some lepton number
violating processes, namely baryogenesis via leptogenesis and neutrinoless
double beta decay, and on some lepton flavor violating processes, namely
radiative lepton decays in supersymmetric seesaw models.


title: The Transverse Spin

abstract:
  Contents :
  1. Pre-history
  2. Transversity versus helicity
  3. The massless limit. "Cardan" and "see-saw" transformations
  4. Transversity distribution delta q(x). The diquark spectator model
  5. Soffer inequality
  6. Tensor charge sum rule
  7. t-channel analysis
  8. Selection rules for delta q(x) measurements
  9. Evolution with Q squared
  10. Quark polarimetry. The sheared-jet (Collins) effect
  11. Single-spin asymmetries in inclusive experiments
  12. Quark distribution dependent on both spin and transverse momentum
  13. First evidence of quark transversity


title: Radiative tau decay and the magnetic moment of the muon

abstract:
  We discuss the decay tau^- -> nu_tau pi^- pi^0 gamma in terms of a model with
the correct low-energy structure and with the relevant resonance degress of
freedom. The nontrivial radiative dynamics becomes visible for large photon
momenta only. We use the model to calculate electromagnetic corrections for the
two-pion contribution to hadronic vacuum polarization extracted from
photon-inclusive two-pion decays. The corrections are insensitive to the
details of the model and depend on the pion form factor only. Putting all
relevant isospin violating corrections together, we obtain a shift Delta a_mu =
(- 120 +/- 26 +/- 3) x 10^-11 to be applied to determinations of the anomalous
magnetic moment of the muon from photon-inclusive tau data.


title: Double parton scatterings in b-quark pairs production at the LHC

abstract:
  A sizable rate of events where two pairs of b-quarks are produced
contemporarily is foreseen at the CERN LHC, as a consequence of the large
parton luminosity. At very high energies both single and the double parton
scatterings contribute to the process, the latter mechanisms, although power
suppressed, giving the dominant contribution to the integrated cross section.


title: Baryon Form Factors at High Momentum Transfer and GPD's

abstract:
  Nucleon elastic and transition form factors at high momentum transfer -t are
treated in terms of generalized parton distributions in a two-body framework.
In this framework the high -t dependence of the form factors give information
about the high k_perp, or short distance b_perp correlations of nucleon model
wave functions. Applications are made to elastic and resonance nucleon form
factors, and real Compton Scattering.


title: Diffractive Higgs Production: Myths and Reality

abstract:
  A critical comparison is made between recent predictions of the cross
sections for diffractive Higgs production at the Tevatron and the LHC. We show
that the huge spread of the predictions arises either because different
diffractive processes are studied or because important effects are overlooked.
Exclusive production offers a reliable, viable Higgs signal at the LHC provided
that proton taggers are installed.


title: Comparison of SUSY mass spectrum calculations

abstract:
  We provide a comparison of the results of four SUSY mass spectrum
calculations in mSUGRA: Isajet, SuSpect, SoftSusy, and SPheno. In particular,
we focus on the high tan(beta) and focus point regions, where the differences
in the results are known to be large.


title:
Multi-parameter fits to the t-tbar threshold observables at a future
  e+e- linear collider

abstract:
  A realistic study of the physics reach of a t-tbar threshold scan at a future
e+e- linear collider is presented. The results obtained take into account
experimental and, to a large extent, theoretical systematic errors, as well as
beam effects. Because of the large correlations between the physical parameters
that can be extracted from the threshold scan, a multi-parameter fit is seen as
mandatory. It is shown that the top mass, the top width and alpha_s(M_Z) can be
extracted simultaneously with uncertainties around 20 MeV, 30 MeV and 0.0012,
respectively, while the top Yukawa coupling can be measured, with the previous
three parameters, to an uncertainty of about 35%, after assuming an external
prior on alpha_s of +/-0.001.


title:
Nonlinear dynamics of soft boson excitations in hot QCD plasma I:
  plasmon-plasmon scattering

abstract:
  On the basis of pure gauge sector of Blaizot-Iancu equation, we derive
kinetic equation of Boltzmann type, taking into account 2n+2-colorless plasmon
decay processes, n=1,2,.... Using so-called Tsytovich correspondence principle,
a direct connection between matrix elements of the plasmon decay processes and
certain effective current, generating these processes, is established. The
procedure of calculation of matrix element for simplest four-plasmon decay is
considered comprehensively. The limiting value of the plasmon occupation number
(~ 1/g^2, where g is a strong coupling) wherein all plasmon decays with n >= 1,
contribute to the right-hand side of the Boltzmann equation, is defined. The
iterative method of calculation of matrix elements for higher decay processes
(n > 1), is proposed, and a problem of their gauge-invariance is discussed.
Proceed from the general reasons the problem of extension of suggested approach
to the case of color plasmons, is considered. The explicit form of linearized
Boltzmann equation for color plasmons is written out, and it is shown that this
equation covariantly conserves the color current, resulting from color-plasmon
number density.


title: QCD Factorization for the Pion Diffractive Dissociation Into Two Jets

abstract:
  We report a detailed study of the process of pion diffraction dissociation
into two jets with large transverse momenta. We find that the standard
collinear factorization does not hold in this reaction. The structure of
non-factorizable contributions is discussed and the results are compared with
the experimental data. Our conclusion is that the existing theoretical
uncertainties do not allow, for the time being, for a quantitative extraction
of the pion distribution amplitude. (Talk presented at the Workshop on
Exclusive Processes at High Momentum Transfer, Jefferson News, VA, May 15-18,
2002)


title: Detect \Delta G at BNL-RHIC via Double Quarkonium Production

abstract:
  The double spin asymmetry for exclusive $J/\psi$ pair production in the
polarized $p-p$ collisions at RHIC is investigated. Our study shows that the
asymmetry in this process is measurable at RHIC-SPIN experiments in the near
future, and, hence it can be used to determine the gluon distribution function
$\Delta G (x)$ in the polarized nucleon.


title: Light neutrino propagation in matter without heavy neutrino decoupling

abstract:
  We review the propagation of light neutrinos in matter assuming that their
mixing with heavy neutrinos is close to present experimental limits. The
phenomenological implications of the non-unitarity of the light neutrino mixing
matrix for neutrino oscillations are discussed. In particular we show that the
resonance effect in neutrino propagation in matter persists, but for slightly
modified values of the parameters and with the maximum reduced by a small
amount proportional to the mixing between light and heavy neutrinos squared.


title:
Analytical solutions of a Dirac bound state equation and their field
  interpretation

abstract:
  We solve the single particle Dirac bound state equation with a particular
confining potential and comment its significance from the point of view of the
quantum field theory. We show that the solutions describe a complex physical
system made of a free particle and of an effective field representing the
confining potential.


title: The Centauro events as a result of induced pions emission

abstract:
  It is shown that only in the case of n pion production amplitude (at n > 10),
which is symmetric enough relative to the momenta permutations, there is
appreciable probability of events with nothing but charged or nothing but
neutral pions. Significant enhancement of the probability of these events in
comparison with that follows from Poisson distribution is caused by induced
pions emission, in complete analogy with the phenomenon of the induced photon
emission in QED.


title:
The Anomalous Chromomagnetic Dipole Moment of the Top Quark in Different
  Frameworks

abstract:
  We give explicit formulae for the anomalous chromomagnetic dipole moment of
the top quark in the framework of the standard model, the two higgs doublet
model and the minimal supersymmetric standard model. Finally, we compare the
results for this coupling with the bound -0.03 <= Delta kappa <= 0.01 coming
from analysis of b --> s gamma process whith an on-shell gluon.


title: The Matter-Antimatter Asymmetry of the Universe

abstract:
  I will give here an overview of the present observational and theoretical
situation regarding the question of the matter-antimatter asymmetry of the
universe and the related question of the existence of antimatter on a
cosmological scale. I will also give a simple discussion of the role of CP
violation in this subject.


title: Extracting gamma Through Flavour-Symmetry Strategies

abstract:
  A brief overview of flavour-symmetry strategies to extract the angle gamma of
the unitarity triangle is given, focusing on B --> pi K modes and the B_d -->
pi^+ pi^-, B_s --> K^+ K^- system. We discuss also a variant of the latter
approach for the e^+ e^- B-factories, where B_s --> K^+ K^- is replaced by B_d
--> pi^{+/-} K^{+/-}.


title:
GVMD model predictions for the low Q^2 behaviour of the spin structure
  function g_1(x,Q^2) and of the DHGHY integral I(Q^2)

abstract:
  Predictions for g_1(x,Q^2) at low Q^2 are obtained in the framework of the
GVMD model. Contributions from both light and heavy vector mesons are
evaluated. The DHGHY sum rule is employed to fix the magnitude of the light
vector meson contribution to g_1, using the recent measurements in the region
of baryonic resonances. The DHGHY moment function is calculated. Predictions
are compared to the data.


title:
Confronting Spin Flavor Solutions of the Solar Neutrino Problem with
  current and future solar neutrino data

abstract:
  We show that spin flavor precession solutions to the solar neutrino problem,
although preferred by the latest solar data, are ruled out by the first results
from the KamLAND reactor experiment, at more than 3_sigma. An illustrative chi2
plot comparing these descriptions with oscillations is given.


title: Two-body modes of B mesons and the CP-b triangle

abstract:
  The study of charmless two-body decays of B mesons is currently one of the
hottest topics in B physics. QCD factorization provides the theoretical
framework for a systematic analysis of such decays. A global fit to B->pi K,pi
pi branching fractions, combined with knowledge on |V(ub)|, establishes the
existence of a CP-violating phase in the bottom sector of the CKM matrix and
tends to favor values of gamma near 90 degrees, somewhat larger than those
suggested by the standard analysis of the unitarity triangle. A novel
construction of the unitarity triangle is presented, which is independent of
B-B(bar) and K-K(bar) mixing. It can provide stringent tests of the Standard
Model with small theoretical uncertainties.


title: Lepton Flavor Violation in Z and Lepton Decays in Supersymmetric Models

abstract:
  The observation of charged lepton flavor non-conservation would be a clear
signature of physics beyond the Standard Model. In particular, supersymmetric
(SUSY) models introduce mixings in the sneutrino and the charged slepton
sectors which could imply flavor-changing processes at rates accessible to
upcoming experiments. In this paper we analyze the possibility to observe Z -->
lep_I lep_J in the GigaZ option of TESLA at DESY. We show that although models
with SUSY masses above the current limits could predict a branching ratio BR(Z
--> mu e) accessible to the experiment, they would imply an unobserved rate of
mu --> e gamma and thus are excluded. In models with a small mixing angle
between the first and the third (or the second and the third) slepton families
GigaZ could observe Z --> tau mu (or Z --> tau e) consistently with present
bounds on lep_J --> lep_I gamma. In contrast, if the mixing angles between the
three slepton families are large the bounds from mu --> e gamma push these
processes below the reach of GigaZ. We show that in this case the masses of the
three slepton families must be strongly degenerated (with mass differences of
order 10^{-3}). We update the limits on the slepton mass insertions
delta_{LL,RR,LR} and discuss the correlation between flavor changing and g_mu-2
in SUSY models.


title:
Hydrodynamics with spontaneous symmetry breaking: application to
  relativistic heavy ion collisions

abstract:
  In this paper we apply hydrodynamics for systems with continuous broken
symmetries to heavy ion collisions in the framework of (1+1) dimensional
Bjorken model. The temperature profile with respect to proper time determined
in that context exhibits no differences with the ideal fluid. On the contrary,
it is shown that the profile obtained when M\"{u}ller-Israel-Stewart second
order theory of dissipation is included on top of standard hydrodynamics
indicates a slower cooling of the system.


title:
CP-odd A^0 production at e^+e^- colliders in MSSM with CP violating
  phases

abstract:
  We study the production of a heavy CP-odd $A^0$ boson in association with a
photon $e^+e^-\to A^0\gamma$ and a Z boson $e^+e^-\to A^0 Z$ as well as the
single production of $A^0$ via $e^+e^- \to \nu_e\bar{\nu}_e A^0$ in the MSSM
with CP violating phases. In the case of $e^+e^-\to A^0\gamma / A^0 Z$, we show
that the squark contribution, which vanishes in the MSSM with real parameters,
turns out to be sizeable in presence of CP violating phases in the soft SUSY
parameters. For $e^+e^- \to \nu_e \bar{\nu}_e A^0$ in both the 2HDM and MSSM
with real parameters, the cross section does not reach observable rates at a
NLC. It is found that with a large CP violating phase for $A_t$, cross sections
of the order 0.1 fb are attainable for all the processes $e^+e^-\to A^0\gamma$,
$e^+e^-\to A^0 Z$ and $e^+e^- \to \nu_e \bar{\nu}_e A^0$.


title: Noise and Dissipation During Preheating

abstract:
  We study the consequences of noise and dissipation for parametric resonance
during preheating. The effective equations of motion for the inflaton and the
radiation field are obtained and shown to present self-consistent noise and
dissipation terms. The equations exhibit the usual parametric resonance
phenomenon, allowing for exponential amplification of the radiation modes
inside the instability bands. By focusing on the dimension of the border of
those bands we explicitly show that they are fractal, indicating the strong
dependence of the outcome in the initial conditions. The simultaneous effect of
noise and dissipation to the fractality of the borders are then examined.


title: Soft and collinear parton radiation in heavy quark production

abstract:
  When the energy of the heavy quark is comparable with its mass, it is natural
to attribute this heavy quark to the hard part of the reaction. At large
energies, this approach is impractical due to large logarithms from intensive
QCD radiation affecting both inclusive and differential observables. We present
a formalism for all-order summation of such logarithms and reliable description
of heavy-quark distributions at all energies. As an illustration, we calculate
angular distributions of B-mesons produced in neutral-current events at large
momentum transfers at the ep collider HERA.


title: Renormalization in Reparameterization Invariance

abstract:
  The renormalization issue of the reparameterization invariance in heavy quark
effective theory and NRQCD is investigated. I argue that the renormalization of
the transformation of the heavy quark field under the variation of the velocity
parameter V is attributed to the renormalization of the small component field
in the proposed transformation. I show that the matching condition for
determining the renormalized small component field can be obtained by imposing
an infinitesimal transformation of V on the relations between the Green's
functions in QCD full theory and those in the effective theory. As an
application, I determine the renormalized transformation to order 1/m^2 using
the matching condition. The obtained result is in disagreement with that
determined by indirect method.


title: Probing neutrino properties with charged scalar lepton decays

abstract:
  Supersymmetry with bilinear R-parity violation provides a predictive
framework for neutrino masses and mixings in agreement with current neutrino
oscillation data. The model leads to striking signals at future colliders
through the R-parity violating decays of the lightest supersymmetric particle.
Here we study charged scalar lepton decays and demonstrate that if the scalar
tau is the LSP (i) it will decay within the detector, despite the smallness of
the neutrino masses, (ii) the relative ratio of branching ratios Br({tilde
tau}_1 --> e sum nu_i)/ Br({tilde tau}_1 --> mu sum nu_i) is predicted from the
measured solar neutrino angle, and (iii) scalar muon and scalar electron decays
will allow to test the consistency of the model. Thus, bilinear R-parity
breaking SUSY will be testable at future colliders also in the case where the
LSP is not the neutralino.


title: No Froissart Bound from Gluon Saturation

abstract:
  In the previous work hep-ph/0112140, hep-ph/0204277, we showed that while the
nonlinear QCD evolution equation of Balitsky and Kovchegov (BK) leads to
saturation of the scattering amplitude locally in impact parameter space, it
does not unitarize the total cross section. This result was recently challenged
by Ferreiro, Iancu, Itakura and McLerran (FIIM) who claim that the
dipole-hadron cross section computed from the BK equation saturates the
Froissart bound. In this comment, we point to a fundamental error in the
argument of FIIM which invalidates their conclusion. We show that if the total
cross section violates unitarity for a coloured scattering probe, it does so
also for a colourless scattering probe.


title:
Polynomiality of off-forward distribution functions in the chiral quark
  soliton model

abstract:
  Mellin moments of off-forward distribution functions are, at t = 0, even
polynomials of the skewedness parameter xi. It is proven that the unpolarized
off-forward distribution functions in the chiral quark soliton model satisfy
this so called polynomiality property. The proof is an important contribution
to the demonstration that the description of off-forward distribution functions
in the model is consistent.


title: Chiral order and fluctuations in multi-flavour QCD

abstract:
  Multi-flavour (N_f>=3) Chiral Perturbation Theory (ChPT) may exhibit
instabilities due to vacuum fluctuations of sea q-bar q pairs. Keeping the
fluctuations small would require a very precise fine-tuning of the low-energy
constants L_4 and L_6 to L_4[crit](M_rho) = - 0.51 * 10^(-3), and
L_6[crit](M_rho) = - 0.26 * 10^(-3). A small deviation from these critical
values -- like the one suggested by the phenomenology of OZI-rule violation in
the scalar channel -- is amplified by huge numerical factors inducing large
effects of vacuum fluctuations. This would lead in particular to a strong
N_f-dependence of chiral symmetry breaking and a suppression of multi-flavour
chiral order parameters. A simple resummation is shown to cure the instability
of N_f>=3 ChPT, but it modifies the standard expressions of some O(p^2) and
O(p^4) low-energy parameters in terms of observables. On the other hand, for
r=m_s/m > 15, the two-flavour condensate is not suppressed, due to the
contribution induced by massive vacuum s-bar s pairs. Thanks to the latter, the
standard two-flavour ChPT is protected from multi-flavour instabilities and
could provide a well-defined expansion scheme in powers of non-strange quark
masses.


title: Parameters in Weight Calculations for the BE Effect

abstract:
  The weight method of implementing the BE effect into Monte Carlo generators
is discussed and presented in some detail. We show how the choice of free
parameters and the definition of "direct" pions influence the results for the
hadronic Z0 decays.


title:
Baryogenesis and Gravitino Dark Matter in Gauge-Mediated
  Supersymmetry-Breaking Models

abstract:
  We discuss two cosmological issues in a generic gauge-mediated supersymmetry
(SUSY)-breaking model, namely the Universe's baryon asymmetry and the gravitino
dark-matter density. We show that both problems can be simultaneously solved if
there exist extra matter multiplets of a SUSY-invariant mass of the order of
the ``$\mu$-term'', as suggested in several realistic SUSY grand-unified
theories. We propose an attractive scenario in which the observed baryon
asymmetry is produced in a way totally independent of the reheating temperature
of inflation without causing any cosmological gravitino problem. Furthermore,
in a relatively wide parameter space, we can also explain the present mass
density of cold dark matter by the thermal relics of the gravitinos without an
adjustment of the reheating temperature of inflation. We point out that there
is an interesting relation between the baryon asymmetry and the dark-matter
density.


title: Linking generalized parton distributions to constituent quark models

abstract:
  The link between the nucleon generalized parton distributions and the
non-diagonal one-body density matrix in momentum space is studied. Attention is
focussed on the region where quark generalized parton distributions (GPD's)
describe emission and reabsorption of a single active quark by the target
nucleon. The correct covariant connection with wave functions used in any
constituent quark model is established. Results obtained with different
constituent quark models are presented for the unpolarized quark GPD's.


title: Reshuffling the OPE: Delocalized Operator Expansion

abstract:
  A generalization of the operator product expansion for Euclidean correlators
of gauge invariant QCD currents is presented. Each contribution to the modified
expansion, which is based on a delocalized multipole expansion of a
perturbatively determined coefficient function, sums up an infinite series of
local operators. On a more formal level the delocalized operator expansion
corresponds to an optimal choice of basis sets in the dual spaces which are
associated with the interplay of perturbative and nonperturbative N-point
correlations in a distorted vacuum. A consequence of the delocalized expansion
is the running of condensates with the external momentum. Phenomenological
evidence is gathered that the gluon condensate, often being the leading
nonperturbative parameter in the OPE, is indeed a function of resolution.
Within a model calculation of the nonperturbative corrections to the ground
state energy of a heavy quarkonium system it is shown exemplarily that the
convergence properties are better than those of the OPE. Potential applications
of the delocalized operator expansion in view of estimates of the violation of
local quark-hadron duality are discussed.


title: Neutrino oscillations beyond two flavours

abstract:
  I review some theoretical aspects of neutrino oscillations in the case when
more than two neutrino flavours are involved. These include: approximate
analytic solutions for 3-flavour (3f) oscillations in matter; matter effects in
nu_mu - nu_tau oscillations; 3f effects in oscillations of solar, atmospheric,
reactor and supernova neutrinos and in accelerator long-baseline experiments;
CP and T violation in neutrino oscillations in vacuum and in matter; the
problem of U_{e3}; 4f oscillations.


title: Finite temperature Z(N) phase transition with Kaluza-Klein gauge fields

abstract:
  If SU(N) gauge fields live in a world with a circular extra dimension,
coupling there only to adjointly charged matter, the system possesses a global
Z(N) symmetry. If the radius is small enough such that dimensional reduction
takes place, this symmetry is spontaneously broken. It turns out that its fate
at high temperatures is not easily decided with straightforward perturbation
theory. Utilising non-perturbative lattice simulations, we demonstrate here
that the symmetry does get restored at a certain temperature T_c, both for a
3+1 and a 4+1 dimensional world (the latter with a finite cutoff). To avoid a
cosmological domain wall problem, such models would thus be allowed only if the
reheating temperature after inflation is below T_c. We also comment on the
robustness of this phenomenon with respect to small modifications of the model.


title: Secondary Neutrinos from Tau Neutrino Interactions in Earth

abstract:
  The energy dependence of "secondary" neutrinos from the process
nutau->tau->numubar->mubar for two input tau neutrino fluxes (F^0_nu ~ 1/E_nu
and 1/E_nu^2), assumed to have been produced via neutrino oscillations from
extragalactic sources, is evaluated to assess the impact of secondary neutrinos
on the upward muon rates in a km^3 detector. We show that the secondard fluxes
are considerably suppressed for the steeper flux, and even for fluxes ~ 1/E_nu,
the secondary flux will be difficult to observe experimentally.


title:
Possibility of the odderon discovery via observation of charge asymmetry
  in the diffractive pi+pi- production at HERA

abstract:
  The interference between the Pomeron and possible odderon mechanisms of
diffractive pi+pi- photoproduction results in charge asymmetry of the produced
pions. The observation of charge asymmetry of pions at moderate M_{pi+pi-} will
be an undoubted signal of odderon existence. To make numeral estimates more
definite, we limit ourselves by the region M_{pi+pi-} = 1.1 -- 1.5 GeV, where
in the odderon mechanism of dipion production, the production via single
f_2(1270) resonance is expected to be dominant. We find a very statistically
significant effect of the odderon induced charge asymmetry even with very
modest estimates for the f_2 photoproduction cross section (without referring
to any particular model of the odderon).


title: Dynamics of broken symmetry lambda phi^4 field theory

abstract:
  We study the domain of validity of a Schwinger-Dyson (SD) approach to
non-equilibrium dynamics when there is broken symmetry. We perform exact
numerical simulations of the one- and two-point functions of lambda phi^4 field
theory in 1+1 dimensions in the classical domain for initial conditions where <
phi(x) > not equal to 0. We compare these results to two self-consistent
truncations of the SD equations which ignore three-point vertex function
corrections. The first approximation, which sets the three-point function to
one (the bare vertex approximation (BVA)) gives an excellent description for <
phi(x) > = phi(t). The second approximation which ignores higher in 1/N
corrections to the 2-PI generating functional (2PI -1/N expansion) is not as
accurate for phi(t). Both approximations have serious deficiencies in
describing the two-point function when phi(0) > .4.


title: Neutrino masses and non abelian horizontal symmetries

abstract:
  Recent neutrino experiments have made very significant progresses and our
knowledge of neutrino masses and mixing has considerably improved. In a model
independent Monte Carlo approach, we have examined a very large class of
textures, in the context of non abelian horizontal symmetries; we have found
that neutrino data select only those charged lepton matrices with left-right
asymmetric texture. The large atmospheric mixing angle needs m_{23} ~= m_{33}.
This result,if combined with similar recent findings for the quark sector in
the B oscillations, can be interpreted as a hint for SU(5) unification. In the
neutrino sector strict neutrino anarchy is disfavored by data, and at least a
factor 2 of suppression in the first row and column of the neutrino majorana
mass matrix is required.


title:
KamLAND potentiality on the determination of Neutrino mixing parameters
  in the post SNO-NC era

abstract:
  We study in detail the power of the reactor experiment kamLAND for
discriminating existing solutions to the SNP and giving accurate information on
neutrino masses and mixing angles. Assuming the expected signal corresponding
to various ``benchmark'' points in the 2 dimensional $(\Delta m^2,\tan^2
\theta)$ mixing plane, we develop a full-fledged $\chi^2$ analysis which
includes KamLAND spectrum and all the existing solar evidence. A complete
modelling of statistical and known systematics errors for 1 and 3 years of data
taking is also included, exclusion plots are presented.
  We find a much higher sensitivity especially for values of $\Delta m^2$ lying
in the central part of the LMA region. The situation would be more complicate
for values closer to the border of the LMA region (the so called HLMA region,
i.e. $\Delta m^2 \leq 2 \times 10^{5}$ and $\Delta m^2 \geq 8-9 \times 10^{-5}$
or $tan^2 \theta$ far from $\tan^2 \theta = 0.5$). In this case kamLAND, with
or without solar evidence, will be able only to select multiple regions in the
parameter space, in the sense that different possible values of the parameters
would produce the same signal.


title: Field-Theory Amplitudes as Resurgent Functions

abstract:
  A series of informal seminars at graduate-student level on the subject of
coupling dependence in quantum field theory, with an elementary introduction to
the notion of resurgent function that forms the appropriate framework for the
coupling dependence of strictly renormalizable theories. While most of the
discussion is pedagogical, there are also a few things for the expert: we
demonstrate, by studying a model spectral integral, that an amplitude may
possess both the t'Hooft set of singularities in the coupling-constant plane,
and Borel-plane singularities of the infrared-renormalon type in its
perturbative part, and yet be uniquely reconstructible from its resurgent
symbol, the appropriate generalization of the semiconvergent perturbation
expansion. In the same model we demonstrate the virtues of a quasi-perturbative
expansion, obtained by resummation of the resurgent symbol in its
nonperturbative direction, and which in contrast to the perturbative one is
Borel summable. On the basis of this expansion, we discuss a systematic
approximation method for the reconstruction of correlation functions with the
resurgent coupling dependence typical of strictly renormalizable and
asymptotically free theories.


title: Effects of new physics in neutrino oscillations in matter

abstract:
  A new flavor changing electron neutrino interaction with matter would always
dominate the nu_e oscillation probability at sufficiently high neutrino
energies. Being suppressed by theta_{13}, the energy scale at which the new
effect starts to be relevant may be within the reach of realistic experiments,
where the peculiar dependence of the signal with energy could give rise to a
clear signature in the nu_e --> nu_tau channel. The latter could be observed by
means of a coarse large magnetized detector by exploiting tau --> mu decays. We
discuss the possibility of identifying or constraining such effects with a high
energy neutrino factory. We also comment on the model independent limits on
them.


title: Scale- and gauge-independent mixing angles for scalar particles

abstract:
  The existing definitions of mixing angles (one-loop radiatively corrected and
renormalization-scale-independent) for scalar particles turn out to be
gauge-dependent when used in gauge theories. We show that a scale- and
gauge-independent mixing angle can be obtained if the scalar self-energy is
improved by the pinch technique, and give two relevant examples in the Minimal
Supersymmetric Standard Model: the mixing of CP-even Higgs scalars and of top
squarks. We also show that the recently proposed definition of mixing angle
that uses the (unpinched) scalar two-point function evaluated at a particular
value of the external momentum [p_*^2=(M_1^2+M_2^2)/2, where M_{1,2} are the
masses of the mixed particles] computed in Feynman gauge coincides with the
gauge-invariant pinched result. In alternative definitions (e.g. in the
on-shell scheme), the improved Higgs mixing angle is different from that in
Feynman gauge. An arbitrariness of the pinch technique for scalar particles is
also discussed.


title: The All-Purpose Neutrino Mass Matrix

abstract:
  A four-parameter Majorana neutrino mass matrix is proposed, which is exactly
diagonalizable with two mixing angles, one of which is pi/4 and the other large
but less than pi/4. The form of this mass matrix allows seven realizations of
the present data on atmospheric and solar neutrino oscillations: three have the
normal hierarchy, two have the inverse hierarchy, and two have three nearly
degenerate masses. The possible inclusion of CP violation is also discussed.


title: CP asymmetries in dileptonic decays of B-meson in MSSM

abstract:
  Scalar interactions (in effective Hamiltonian) can give significant variation
of various experimental observables, as comparted to their respective Standard
Model values, in dileptonic decays of B-meson. Also the quark level transition
$b \to d \ell^- \ell^+$ can be useful to test CP violation. Here we will do
comparative study of CP violation in two independent processes, which have the
same quark level transition ($b \to d \ell^- \ell^+$), $B \to X_d \ell^-
\ell^+$ (the inclusive decay mode) and the exclusive channel $B_d \to \ell^-
\ell^+ \gamma$ (radiative dileptonic decay mode). We will mainly focus on the
comparative study of scalar interactions on the CP asymmetries in these two
different channels.


title: Precision Studies of Relativity in Electrodynamics

abstract:
  In this contribution to the proceedings of the 2002 Workshop for Fundamental
Physics in Space, a discussion of recent work on astrophysical and laboratory
tests of Lorentz symmetry in electrodynamics is presented. Stringent
constraints are placed on birefringence of light emitted from galactic and
extragalactic sources. The prospect of precision clock-comparison experiments
utilizing resonant cavities are considered.