title:
Charged Higgs and Stau Production in Anomaly Mediated Supersymmetry
  Breaking

abstract:
  Charged Higgs production in association with staus in electron positron
annihilation is a signal of supersymmetry with bilinear R-Parity violation. In
this model, neutrino masses and mixing angles are generated due to mixing with
neutralinos. We show how parameters related to neutrino physics can be
determined at a $500 {\mathrm fb}^{-1}$ Linear Collider from measurements of
charged Higgs and stau production cross sections and decay rates. This can be
achieved in AMSB where charged Higgs and stau can have similar masses.


title: Non-thermal Dark Matter from Affleck-Dine Baryogenesis

abstract:
  In this talk we discuss the origin and nature of the dark matter in the
Affleck-Dine (AD) baryogenesis. The AD baryogenesis via most of the flat
directions predict formations of large Q-balls, and a great number of the
lightest supersymmetric particles (LSPs) are produced nonthermally via the
late-time decays of these Q-balls. In order to avoid the overclosure of the
universe by these nonthermally produced LSPs, an LSP with a large
pair-annihilation cross section, like Higgsino- or Wino-like neutralino, is
required, instead of the standard Bino-like neutralino. This reveals new
cosmologically interesting parameter regions in various SUSY breaking models,
which have not attracted much attention so far.


title:
Flavor changing Z decay $Z\to b\bar{s}(\bar{b}s)$ in topcolor-assisted
  technicolor models

abstract:
  In the context of topcolor-assisted technicolor (TC2) models, we examine the
flavor changing (FC) Z decay $Z\to b\bar{s}(\bar{b}s)$ and calculate the
contributions of the new particles predicted by TC2 models to the branching
ratio Br($Z\to b\bar{s}+\bar{b}s$). We find that the contributions mainly come
from the top-pions. In most of the parameter space, the Br($Z\to
b\bar{s}+\bar{b}s$) can reach $10^{-5}$, which may be detected in near future
experiments such as Giga-Z version of the TESLA. Thus, the FC Z decay $Z\to
b\bar{s}(\bar{b}s)$ can be used to test TC2 models.


title:
Abandoning Exact SU(3) in Coupled-Channel Final-State Interactions
  through Reggeon Exchange for $B\to \pi\pi, K\bar{K}$

abstract:
  For weak decays $B_d^{0}\to \pi\pi$ and $K\bar{K}$ the effects of SU(3)
breaking in coupled-channel final-state interaction effects are discussed in a
Regge framework. It is shown that SU(3) breaking in the inelastic final-state
transitions dramatically affects the phases of the isospin $I=0,1,2$ amplitudes
in the $B_d^{0}$ decays. The effect of the singlet penguin diagram on these
phases is studied. Furthermore, on the example of the $B_d^{0}\to \pi\pi$
decays, the dependence of CP asymmetries on the size of penguin amplitude is
analyzed.


title: Chern-Simons-fermion model of quarks

abstract:
  We propose an extension of the standard model where quarks are viewed as
fermions with a ``bare'' integer (weak) hypercharge which is normalized with a
fractional part created by a quantized topological Chern-Simons configuration
of the weak gauge fields. Consistency with hypercharge patterns not included in
the standard model is shown.


title: Matter-induced modification of resonances at RHIC freezeout

abstract:
  We discuss the physical effects causing a modification of resonance masses,
widths and even shapes in a dilute hadronic gas at late stages of heavy ion
collisions. We quantify the conditions at which resonances are produced at
RHIC, and found that it happens at $T\approx 120 MeV$. Although in the pp case
the ``kinematic'' effects like thermal weighting of the states is sufficient,
in AA we see a clear effect of dynamical interaction with matter, both due to a
variety of s-channel resonances and due to t-channel scalar exchanges. The
particular quantity we focus mostly on is the $\rho$ meson mass, for which
these dynamical effects lead to about -50 MeV shift, on top of about -20 MeV of
a thermal effect: both agree well with preliminary data from STAR experiment at
RHIC. We also predict a complete change of shape of $f_0(600)$ resonance, even
by thermal effects alone.


title: New and Useful Gauge Extension of the MSSM

abstract:
  A new nontrivial U(1) gauge extension of the Minimal Supersymmetric Standard
Model (MSSM) is proposed which automatically conserves baryon number and lepton
number, and solves the mu problem. Naturally small Dirac neutrino masses are
also possible in this context.


title:
DIS structure functions and the double-spin asymmetry in $\rho^0$
  electroproduction within a Regge approach

abstract:
  The proton, neutron and deuteron structure functions $F_2(x,Q^2)$ and
$g_1(x,Q^2)$, measured at intermediate $Q^2$, are analyzed within a Regge
approach. This analysis serves to fix the parameters of this scheme which are
then used to calculate, in a unified Regge approach, the properties of $\rho^0$
meson electroproduction on the proton and the deuteron. In this way, the
double-spin asymmetry observed at HERMES in $\rho^0$ electroproduction on the
proton, can be related to the anomalous behavior of the flavor-singlet part of
the spin-dependent structure function $g_1(x,Q^2)$ at small $x$.


title: Varying Couplings From Orbifold GUTs

abstract:
  We discuss the variation of gauge couplings in time in the framework of
orbifold constructions, due to a change of the extra compact dimension's size.
Models with gauge coupling unification allow to estimate the variation of the
strong coupling constant $\al_3$ and to relate it to a variation of
$\alpha_{em}$. The extra-dimensional construction turns out to be crucial for
the model to be compatible with data. Within the presented 5D scenarios, the
tower of KK states significantly affects gauge coupling running, leads to low
scale unification, and provides a suppression of the $\al_3(M_Z)$ variation.


title: Overview of tan(beta) Determination at a Linear e+e- Collider

abstract:
  The ratio of the vacuum expectation value of the two Higgs doublets,
tan(beta), is an important parameter of the general 2-Higgs-Doublet Model
(2HDM) and the Minimal Supersymmetric extension of the Standard Model (MSSM).
The expected uncertainty on the determination of tan(beta) at a Linear Collider
(LC) of at least 500 GeV center-of-mass energy and high luminosity is reviewed
based on studies of neutral and charged Higgs boson production.


title: Big Corrections from a Little Higgs

abstract:
  We calculate the tree-level expressions for the electroweak precision
observables in the SU(5)/SO(5) littlest Higgs model. The source for these
corrections are the exchange of heavy gauge bosons, explicit corrections due to
non-linear sigma-model dynamics and a triplet Higgs VEV. Weak isospin violating
contributions are present because there is no custodial SU(2) global symmetry.
The bulk of these weak isospin violating corrections arise from heavy gauge
boson exchange while a smaller contribution comes from the triplet Higgs VEV. A
global fit is performed to the experimental data and we find that throughout
the parameter space the symmetry breaking scale is bounded by f > 4 TeV at 95%
C.L. Stronger bounds on f are found for generic choices of the high energy
gauge couplings. We find that even in the best case scenario one would need
fine tuning of less than a percent to get a Higgs mass as light as 200 GeV.


title: Progress in calculating hexagon amplitudes at one-loop

abstract:
  In this article I review recent progress towards the analytical calculation
of massless 6--point amplitudes. A way to organize such calculations is
sketched and results for scattering amplitudes in the Yukawa model are
presented.


title: Fermionic currents flowing along extended objects

abstract:
  This PhD thesis discusses the internal structure of topological defects, and
branes in extra-dimensions, carrying fermionic currents.
  The general framework in which these objects may appear is presented in the
first part while the second part is devoted to the dynamic of cosmic strings, a
class of topological defects of uttermost importance to modern cosmology, as it
can be obtained from a macroscopic covariant formalism. This formalism offers a
unified description of cosmic strings, including the case for which they carry
internal currents, and allows the study of their cosmological evolution, and
implications, by means of numerical simulations. Its validity has already been
confirmed for cosmic string carrying bosonic currents, and the third part
provides new results concerning the fermionic currents case. First, the fermion
mass spectrum in a cosmic string is computed, and suggests that fermionic
currents are usually built on massive propagation modes leading to a new
equation of state. This highlights that the usual one parameter macroscopic
formalism is not always sufficient in case of fermionic currents. Moreover,
contrary to the bosonic case, the dynamics stemming from this equation of state
exhibits transitions between the subsonic and supersonic regimes whose
consequences in cosmology could be important. The last part is an extension of
these results to brane cosmology for which our universe is viewed as a four
dimensional domain wall embedded in a five dimensional space-time. In the
framework of the Randall-Sundrum model, the masses of the trapped fermions on
the brane can be predicted.


title: Octet and Decuplet Baryon Magnetic Moments in the Chiral Quark Model

abstract:
  Octet and decuplet baryon magnetic moments have been formulated within the
\chiQM with configuration mixing incorporating the sea quark polarizations and
their orbital angular momentum through the generalization of the Cheng-Li
mechanism. When the parameters of \chiQM without configuration mixing are fixed
by incorporating the latest data pertaining to $\bar u-\bar d$ asymmetry (E866)
and the spin polarization functions, in the case of octet magnetic moments the
results not only show improvement over the nonrelativistic quark model results
but also give a non zero value for the right hand side of Coleman-Glashow sum
rule, usually zero in most of the models. When effects of configuration mixing
and ``mass adjustments'' due to confinement are included, in the case of p,
\Sigma^+, \Xi^o, the \Sigma \Lambda transition magnetic moment and the
violation of Coleman Glashow sum rule an almost perfect agreement with data is
obtained. In the case of decuplet magnetic moments, we obtain a good overlap
for \Delta^{++}, \Omega^- and the transition magnetic moment $\Delta N$ for
which data are available. In case, we incorporate in our analysis the gluon
polarization \Delta g, found phenomenologically through the relation
\Delta\Sigma(Q^2)=\Delta\Sigma-\frac{3\alpha_s(Q^2)}{2\pi}\Delta g(Q^2), we not
only obtain improvement in the quark spin distribution functions and magnetic
moments but also the value of \Delta g comes out to be in good agreement with
certain recent measurements as well as theoretical estimates.


title: F-enomenology

abstract:
  The advantages of Flipped SU(5) over conventional Supersymmetric GUTs, like
SU(5), are discussed. Recent values of the strong coupling at M_Z, sin-squared
theta-Weinberg, g-2 of the muon, and the lower limit on the proton lifetime for
the (K+, anti-neutrino) mode point directly to Flipped SU(5) as the simplest
way to avoid potential pitfalls. It is shown that "F(lipped)-enomenology"
accomodates easily all presently available low-energy data, favoring a rather
"light" supersymmetric spectrum while yielding the right amount of Cold Dark
Matter and a proton lifetime in the ((e+/muon+), pi-zero) mode which is beyond
the present experimental limit yet still possibly accessible to a further round
of experiments.


title: Looking for new solutions to the hierarchy problem

abstract:
  While in first and second quantization the fundamental operators are
respectively coordinates and fields (functions), an extension of quantum field
theory can be achieved if the usual pair of conjugate momenta is represented by
functionals. After a brief introduction on the hierarchy problem, we show how
the ordinary quantum field theory can arise from a specific limit of this
extension. We will also show how this extension can offer new solutions to the
hierarchy problem. The peculiarity that makes this scenario appealing (as
possible solution of the hierarchy problem), is the absence of new light
particles at (or close to) the electroweak scale. This is in much better
agreement with the experimental observation, since (until now) all searches for
new physics signals have confirmed the remarkable success of the Standard Model
(contrary to common expectations).


title:
Twist-3 effects for polarized virtual photon structure function
  $g_2^\gamma$

abstract:
  We investigate twist-3 effects in the polarized virtual photon. The structure
function $g_2^\gamma$, which exists only for the virtual photon target and can
be measured in future polarized $e^+ e^-$ collider experiments, receives both
twist-2 and twist-3 contributions. The twist-3 part is analyzed in pure QED
interaction as well as in LO QCD. We find the twist-3 contribution is
appreciable for the photon in contrast to the nucleon case.


title: CP violation in $B_{d,s}\to l^+l^-$

abstract:
  CP violation in rare leptonic B decays are analyzed in the standard model
(SM) and models beyond SM (supersymmetric models and two Higgs doublet models).


title: Precision calculation for e+ e- -> 2f: the KK MC project

abstract:
  We present the current status of the coherent exclusive (CEEX) realization of
the YFS theory for the processes in e+ e- -> 2f via the KK MC. We give a brief
summary of the CEEX theory in comparison to the older (EEX) exclusive
exponentiation theory and illustrate recent theoretical results relevant to the
LEP2 and LC physics programs.


title: An Electroweak Weizsacker-Williams Method

abstract:
  The Weizsacker-Williams method is a semiclassical approximation scheme used
to analyze a wide variety of electromagnetic interactions. It can greatly
simplify calculations that would otherwise be impractical or impossible to
carry out using the standard route of the Feynman rules. With a few reasonable
assumptions, the scope of the method was generalized so as to accommodate weak,
as well as the usual electromagnetic, interactions. The results are shown to be
in excellent agreement, in the high energy limit of interest, with other
methods, and the generalized scheme is shown to still work in regimes of
analysis where those methods break down.


title: Neutrino Mass, Mixing, and Flavor Change

abstract:
  The theoretical basics of neutrino mass and mixing are reviewed. Dirac and
Majorana masses are explained, and added together to produce the see-saw
picture of the lightness of neutrinos. This picture predicts that neutrinos are
Majorana particles. The character, and an apparent paradox, of Majorana
neutrinos are examined. The physics of neutrino flavor change (oscillation), in
vacuo and in matter, is reviewed.


title:
Rare decay Z --> neutrino antineutrino photon photon via quartic gauge
  boson couplings

abstract:
  We present a detailed calculation of the rare decay Z --> neutrino
antineutrino photon photon via the quartic neutral gauge boson coupling
Z-Z-photon-photon in the framework of the effective Lagrangian approach. The
current experimental bound on this decay mode is then used to constrain the
coefficients of this coupling. It is found that the bounds obtained in this
way, of the order of $10^{-1}$, are weaker than the ones obtained from the
analysis of triple-boson production at LEP-2


title:
Study of CP Property of the Higgs at a Photon Collider using
  $\gamma\gamma\to t\bar t\to l X $

abstract:
  We study possible effects of CP violation in the Higgs sector on $t\bar t$
production at a $\gamma\gamma$-collider. These studies are performed in a
model-independent way in terms of six form-factors $\{\Re(S_{\gamma}),
\Im(S_{\gamma}), \Re(P_{\gamma}), \Im(P_{\gamma}), S_t, P_t\}$ which
parametrize the CP mixing in the Higgs sector, and a strategy for their
determination is developed. We observe that the angular distribution of the
decay lepton from $t/\bar t$ produced in this process is independent of any CP
violation in the $tbW$ vertex and hence best suited for studying CP mixing in
the Higgs sector. Analytical expressions are obtained for the angular
distribution of leptons in the c.m. frame of the two colliding photons for a
general polarization state of the incoming photons. We construct combined
asymmetries in the initial state lepton (photon) polarization and the final
state lepton charge. They involve CP even ($x$'s) and odd ($y$'s) combinations
of the mixing parameters. We study limits up to which the values of $x$ and
$y$, with only two of them allowed to vary at a time, can be probed by
measurements of these asymmetries, using circularly polarized photons. We use
the numerical values of the asymmetries predicted by various models to
discriminate among them. We show that this method can be sensitive to the
loop-induced CP violation in the Higgs sector in the MSSM.


title:
Torsion contraints from the recent precision measurement of the muon
  anomaly

abstract:
  In this paper we consider non-minimal couplings of the Standard Model
fermions to the vector (trace) and axial vector (pseudo-trace) components of
the torsion tensor. We then evaluate the contributions of these vector and
axial vector components to the muon anomaly and use the recent precision
measurement of the muon anomaly to derive constraints on the torsion
parameters.


title:
Neutrino Oscillations, SUSY See-Saw Mechanism and Charged Lepton Flavor
  Violation

abstract:
  Neutrino oscillations give clear evidence for non-vanishing neutrino masses
and lepton-flavor violation (LFV) in the neutrino sector. This provides strong
motivation to search for signals of LFV also in the charged lepton sector, and
to probe the SUSY see-saw mechanism. We compare the sensitivity of rare
radiative decays on the right-handed Majorana mass scale M_R with the reach in
slepton-pair production at a future linear collider.


title: Instanton infra-red stabilization in the nonperturbative QCD vacuum

abstract:
  The influence of nonperturbative fields on instantons in quantum
chromodynamics is studied. Nonperturbative vacuum is described in terms of
nonlocal gauge invariant vacuum averages of gluon field strength. Effective
action for instanton is derived in bilocal approximation and it is demonstrated
that stochastic background gluon fields are responsible for infra-red
(IR)stabilization of instantons. Comparison of obtained instanton size
distribution with lattice data is made.


title:
Precision Measurements in the Scalar Top Sector of the MSSM at a Linear
  e+e- Collider

abstract:
  The scalar top discovery potential has been studied for the TESLA project
with a full-statistics background simulation at sqrt(s)=500 GeV and L=500 fb-1.
The beam polarization is very important to measure the scalar top mixing angle
and to determine its mass. The latest estimation of the beam polarization
parameters is applied. This study includes e+ polarization, which improves the
sensitivity. For a 180 GeV scalar top at minimum production cross section, we
obtain Delta(m)=0.8 GeV and Delta(cos(Theta))=0.008 in the neutralino channel,
and Delta(m)=0.5 GeV and Delta(cos(Theta))=0.004 in the chargino channel. The
MSSM parameters for the Snowmass point 5 at cos(Theta)=0.513 predict a scalar
top of 210 GeV and a neutralino of about 120 GeV. For this parameter choice
Delta(m)=0.95 GeV and Delta(cos(Theta))=0.0125 is obtained, and a preliminary
c-tagging study is presented in the neutralino channel.


title: NLO Higgs boson rapidity distribution at hadron colliders

abstract:
  We describe a new method, based on an extension of the unitarity cutting
rules proposed earlier, which is very efficient for the algorithmic evaluation
of phase-space integrals for various differential distributions. As a first
application, we compute the next-to-leading order normalized rapidity
distribution of the CP-even and the CP-odd Higgs boson produced in hadron
collisions through gluon fusion. We work in the heavy top-quark approximation;
we find that the NLO corrections at the LHC are approximately 5% in the zero
rapidity region.


title: Muon anomalous magnetic moment and lepton flavor violation in MSSM

abstract:
  We give a thorough analysis of the correlation between the muon anomalous
magnetic moment and the radiative lepton flavor violating (LFV) processes
within the minimal supersymmetric standard model. We find that in the case when
the slepton mass eigenstates are nearly degenerate, $\delta a_\mu$, coming from
SUSY contributions, hardly depends on the lepton flavor mixing and, thus, there
is no direct relation between $\delta a_\mu$ and the LFV processes. On the
contrary, if the first two generations' sleptons are much heavier than the 3rd
one, i.e., in the effective SUSY scenario, the two quantities are closely
related. In the latter scenario, the SUSY parameter space to account for the
experimental $\delta a_\mu$ is quite different from the case of no lepton
flavor mixing. Especially, the Higgsino mass parameter $\mu$ can be either
positive or negative.


title: Exploring Flavor Structure of Supersymmetry Breaking at B factories

abstract:
  We investigate flavor physics at present and future B factories in order to
distinguish supersymmetric models. We evaluate CP asymmetries in various B
decay modes, Delta M(Bd), Delta M(Bs), and epsilon_K in three supersymmetric
models, i.e. the minimal supergravity, the SU(5) SUSY GUT with right handed
neutrinos, and a supersymmetric model with U(2) flavor symmetry. The allowed
regions of Delta M(Bs)/Delta M(Bd) and CP asymmetries in B to J/psi K_S and b
to s gamma are different for the three models so that it is possible to
distinguish the three models by precise determinations of these observables in
near future experiments.


title: A numerical method for NNLO calculations

abstract:
  A method to isolate the poles of dimensionally regulated multi-loop integrals
and to calculate the pole coefficients numerically is extended to be applicable
to phase space integrals as well.


title: Higgs and SUSY Particle Production at Hadron Colliders

abstract:
  The theoretical status of Higgs boson and supersymmetric particle production
at hadron colliders is reviewed with particular emphasis on recent results and
open problems.


title: Photon-neutrino interactions in strong magnetic field

abstract:
  The two-photon two-neutrino interaction induced by magnetic field is
investigated. In particular the processes $\gamma \gamma \to \nu \bar \nu$ and
$\gamma \to \gamma \nu \bar \nu$ are studied in the presence of strong magnetic
field. An effective Lagrangian and partial amplitudes of the processes are
presented. Neutrino emissivities due to the reactions $\gamma \gamma \to \nu
\bar \nu$ and $\gamma \to \gamma \nu \bar \nu$ are calculated taking into
account of the photon dispersion and large radiative corrections. A comparison
of the results obtained with previous estimations and another inducing
mechanisms of the processes under consideration is made.


title: Adiabatic density perturbations and matter generation from the MSSM

abstract:
  We propose that the inflaton is coupled to ordinary matter only
gravitationally and that it decays into a completely hidden sector. In this
scenario both baryonic and dark matter originate from the decay of a flat
direction of the minimal supersymmetric standard model (MSSM), which is shown
to generate the desired adiabatic perturbation spectrum via the curvaton
mechanism. The requirement that the energy density along the flat direction
dominates over the inflaton decay products fixes the flat direction almost
uniquely. The present residual energy density in the hidden sector is typically
shown to be small.


title:
The 2+1 Dimensional Quark/Anti-quark Potential in Fourth Order
  Color-Dielectric Transverse Lattice QCD

abstract:
  The 2+1 dimensional (2 space dimensions and 1 time dimension) Transverse
Lattice is constructed using the Color Dielectric formalism. The dynamics of
the Color Dielectric link fields are not known from first principles, so an
ansatz for the effective action is made, which is truncated at fourth order in
the fields. Since the Transverse Lattice is a Light-Front field theory, it
lacks manifest rotational invariance. This lack of manifest rotational
invariance is exploited to determine the couplings in the effective action by
calculating the Quark/Anti-quark Potential, an observable that is very
sensitive to rotational symmetry. This calculation lays the groundwork for a
fully 3+1 dimensional treatment of the Transverse Lattice.


title: Localisation and mass generation for non-Abelian gauge fields

abstract:
  It has been suggested recently that in the presence of suitably "warped"
extra dimensions, the low-energy limit of pure gauge field theory may contain
massive elementary vector bosons localised on a "brane", but no elementary
Higgs scalars. We provide non-perturbative evidence in favour of this
conjecture through numerical lattice measurements of the static quark-antiquark
force of pure SU(2) gauge theory in three dimensions, of which one is warped.
We consider also warpings leading to massless localised vector bosons, and
again find evidence supporting the perturbative prediction, even though the
gauge coupling diverges far from the brane in this case.


title: On the Renormalization of the Minimal Supersymmetric Standard Model

abstract:
  The renormalization of the Minimal Supersymmetric Standard Model is
discussed. In particular we focus on the soft-supersymmetry breaking sector of
the MSSM and comment on non-renormalization theorems.


title: N^3LO fits to xF_3 data : $\alpha_s$ vs 1/Q^2 contributions

abstract:
  The results of approximate N$^$3LO and detailed NNLO fits to $xF_3$ data of
the CCFR'97 collaboration are presented. We demonstrate that $1/Q^2$
non-perturbative corrections to $xF_3$ modeled by three independent procedures
are shadowed by perturbative QCD effects, starting at the NNLO. Special
attention is paid to revealing the role of the recently calculated NNLO
corrections to the anomalous dimensions and $N^3$LO corrections to the
coefficient functions of odd moments of $xF_3$ with $n\leq 13$. The related
values of $\alpha_s(M_Z)$ are extracted.


title: Supersymmetric Higgs Bosons in a 5D Orbifold Model

abstract:
  We analyze the phenomenology of the Higgs sector in a 5D model compactified
on an $S_1/Z_2$ orbifold with a compactification scale $M_C \sim {\mathcal
O}(TeV)$ where supersymmetry breaking is localized on a brane at one of the
fixed points. We show that the conventional MSSM Higgs boson mass bounds in 4D
can be violated when we allow the gauge sector, Higgs and third family
multiplets to live in the fifth extra dimension.


title: High Energy Neutrino and Tau Airshowers in Standard and New Physics

abstract:
  High Energy Neutrino may lead to a New High Energy Astronomy. Neutrino
interaction in matter at PeVs- EeVs may behave differently from Standard Model
predictions because possible TeV Gravity scenario. While traditional km^3
neutrino underground detector will be uneasy to disentangle the Gravity TeV
scenario any new Horizontal Tau Air-Shower detectors at PeVs tau energy, beyond
Mountain Chains, will be greatly enhanced and it may probe fruit-fully the New
TeV Physics imprint. Moreover observing upcoming and horizontal tau air-showers
{UPTAUS, HORTAUS} from high mountains toward Mount Chains or along widest Earth
Crust crown masses at the Horizons edges, Ultra High Energy,UHE, nu_{tau} and
its consequent tau lepton decay in flight, will greatly amplify any single UHE
nu_{tau} track and it will test, at highest energies, huge volumes comparable
to underground km^3 ones; observing UPTAUS and HORTAUs from higher balloons or
satellites at orbit altitudes, at GZK energies, the Horizontal Crown effective
Masses may even exceed 150 km^3. These Highest energies (10^{19} eV) nu
astronomy are tuned to test the needed abundant nu fluence in GZK Z-Showering
model: in this scenario ZeV Ultra High Energy neutrino are hitting on relic
light (0.1-5 eV masses) anti-neutrinos, clustered in dark hot halos, creating
UHE Z bosons whose decay in flight may be the hadronic secondaries observed on
Earth atmosphere as UHECR, isotropically spread along the cosmic edges and
clustered toward few correlated BL Lac sources.


title:
Phenomenological Analysis of Charmless Decays Bs->PP,PV with QCD
  Factorization

abstract:
  We calculated the CP averaged branching ratios and CP-violating asymmetries
of two-body charmless hadronic Bs->PP,PV decays with the QCDF approach,
including the contributions from the chirally enhanced power corrections and
weak annihilations. Only several decay modes, such as Bs -> K^(*)K,
K^(*{\pm}){\pi}^{\mp}, K^{\pm}{\rho}^{\mp}, {\eta}^('){\eta}^('), have large
branching ratios, which may be observed in the near future. The penguin-to-tree
ratio P_{\pi \pi}/T_{\pi \pi} and a bound on angle ${\gamma}$ are given.


title: Transversity in Exclusive and Inclusive Processes

abstract:
  Both meson photoproduction and semi-inclusive deep inelastic scattering can
potentially probe transversity properties of the nucleon. We explore how that
potential can be realized dynamically. The role of rescattering in both
exclusive and inclusive meson production as a source for single spin
asymmetries is examined. Using a dynamical model, we evaluate the spin
independent $\cos 2\phi$ asymmetry associated with transversity of quarks
inside unpolarized hadrons, at HERMES kinematics. We also explore the effects
of rescattering on the transversity distribution of the nucleon.


title: QCD two-loop amplitudes for e+e- --> 3 jets: the fermionic contribution

abstract:
  We review a new technique for the calculation of two-loop amplitudes and
discuss as an example the fermionic contributions to e+ e- --> q qbar g.


title: Lepton Asymmetry in Polarized Drell-Yan

abstract:
  The lepton helicity distributions in the polarized Drell-Yan process at RHIC
energy are investigated. In the absence of the weak interaction, only the
measurement of lepton helicity can prove the antisymmetric part of the hadronic
tensor. Therefore it might be interesting to consider the helicity
distributions of leptons to obtain more information on the structure of nucleon
from the polarized Drell-Yan process. We estimate the QCD corrections at ${\cal
O} (\alpha_s)$ level to the hadronic tensor including both intermediate
$\gamma$ and $Z$ bosons. We report the numerical analyses on the $Z$ pole and
show that the $u (\bar{u})$ and $d (\bar{d})$ quarks give different and
characteristic contributions to the lepton helicity distributions. We also
estimate the lepton helicity asymmetry for the various proton's spin
configurations.


title: Low-energy diffraction; a direct-channel point of view: the background

abstract:
  We argue that at low-energies, typical of the resonance region, the
contribution from direct-channel exotic trajectories replaces the Pomeron
exchange, typical of high energies. A dual model realizing this idea is
suggested. While at high energies it matches the Regge pole behavior, dominated
by a Pomeron exchange, at low energies it produces a smooth, structureless
behavior of the total cross section determined by a direct-channel nonlinear
exotic trajectory, dual to the Pomeron exchange.


title: Mini Black Holes from Ultrahigh Energy Cosmic Neutrinos

abstract:
  We review the perhaps most exciting phenomenology of models with extra
spatial dimensions and Planck scale near TeV: the production of mini black
holes in ultrahigh energy particle collisions, and the discovery potential of
cosmic ray/cosmic neutrino experiments for black hole events before the start
of LHC.


title:
Virtual Compton scattering in the generalized Bjorken region and
  positivity bounds on generalized parton distributions

abstract:
  The positivity bounds on generalized parton distributions are derived from
the positivity properties of the absorptive part of the amplitude of the
virtual Compton scattering in the generalized Bjorken region.


title:
Color Evaporation Description of Inelastic Photo-Production of J/\psi at
  HERA

abstract:
  The H1 Collaboration recently reported a new analysis on the inelastic photo-
production of J/\psi mesons at DESY HERA ep collider. We show that these new
experimental results are well described by the Color Evaporation Model for
quarkonium production. Moreover, this new data requires the introduction of
resolved photon contributions in order to explain the results on small
charmonium energy fraction, indicating that colored c \bar{c} pairs also
contribute to the process.


title:
Polarized SIDIS: comment on purity method for extraction of polarized
  quark distributions

abstract:
  The role of hadronization mechanism in polarization phenomena in semi
inclusive deep inelastic scattering (SIDIS) and a purity method for extraction
of polarized distribution functions are discussed. According to the Monte Carlo
(MC) event generator, on which this method is based, hadrons can be produced
via quark (diquark) fragmentation or light cluster decays. In contrast, the
purity method assumes that only quark fragmentation gives contribution to
hadron production in the current fragmentation region. The ignorance of
contributions from diquark fragmentation and cluster decays to asymmetry can be
source of incorrect values of polarized quark distributions extracted by the
purity method.


title:
Generation of cosmological large lepton asymmetry from a rolling scalar
  field

abstract:
  We propose a new scenario to simultaneously explain a large lepton asymmetry
and a small baryon asymmetry. We consider a rolling scalar field and its
derivative coupling to the lepton number current. The presence of an effective
nonzero time derivative of the scalar field leads to $CPT$ violation so that
the lepton asymmetry can be generated even in thermal equilibrium as pointed
out by Cohen and Kaplan. In this model, the lepton asymmetry varies with time.
In particular, we consider the case where it grows with time. The final lepton
asymmetry is determined by the decoupling of the lepton number violating
interaction and can be as large as order unity. On the other hand, if the
decoupling takes place after the electroweak phase transition, a small baryon
asymmetry is obtained from the small lepton asymmetry at that time through
sphaleron effects. We construct a model in which a rolling scalar field is
identified with a quintessence field.


title:
The Spectrum of a Binding System for a Heavy Quark with an Anti-Sbottom
  or for a Sbottom and Anti-Sbottom Pair

abstract:
  Since long-lived light bottom squark (sbottom) and its anti-particle with a
mass close to the bottom quark have not been excluded by experiments so far, we
consider such a sbottom to combine with its anti-particle to form a color
singlet meson-like bound state or to combine with a common anti-quark to form a
fermion-like one, or accordingly their anti-particles to form an anti-particle
bound system. Namely we calculate the low-lying spectrum of the systems based
on QCD inspired potential model. To be as relativistic as possible, we start
with the framework of Bethe-Salpeter (BS) equation even for non-relativistic
binding systems. Finally, we obtain the requested spectrum by constructing
general forms of the BS wave functions and solving the BS equations under
instantaneous approximation.


title: CP Violation in Hyperon Nonleptonic Decays within the Standard Model

abstract:
  We calculate the CP-violating asymmetries A(Lambda_-^0) and A(Xi_-^-) in
nonleptonic hyperon decay within the Standard Model using the framework of
heavy-baryon chiral perturbation theory (chiPT). We identify those terms that
correspond to previous calculations and discover several errors in the existing
literature. We present a new result for the lowest-order (in chiPT)
contribution of the penguin operator to these asymmetries, as well as an
estimate for the uncertainty of our result that is based on the calculation of
the leading nonanalytic corrections.


title: Is Unitarity of CKM Matrix Violated?

abstract:
  The unitarity of the CKM matrix is examined in the light of the latest
available accurate data. The analysis shows that for the elements in the first
row, there are two types of experimental measurements leading to different
results for the violation of unitarity. A conclusive result cannot be derived
at present. Only more precise data can determine whether the CKM matrix opens
new vistas beyond the standard model or not. The experimental data for the
elements in the second row are not as precise as for those in the first row,
and within the measured uncertainty, the unitarity is not violated. The desired
data is not available for the elements in the third row.


title: Massive two-loop Bhabha scattering -- the factorizable subset

abstract:
  The experimental precision that will be reached at the next generation of
colliders makes it indispensable to improve theoretical predictions
significantly. Bhabha scattering (e^+ e^- \to e^+ e^-) is one of the prime
processes calling for a better theoretical precision, in particular for
non-zero electron masses. We present a first subset of the full two-loop
calculation, namely the factorizable subset. Our calculation is based on DIANA.
We reduce tensor integrals to scalar integrals in shifted (increased)
dimensions and additional powers of various propagators, so-called
dots-on-lines. Recurrence relations remove those dots-on-lines as well as
genuine dots-on-lines (originating from mass renormalization) and reduce the
dimension of the integrals to the generic d = 4 - 2 \epsilon dimensions. The
resulting master integrals have to be expanded to ${\it O}(\epsilon)$ to ensure
proper treatment of all finite terms.


title: Limits of the Standard Model

abstract:
  Supersymmetry is one of the most plausible extensions of the Standard Model,
since it is well motivated by the hierarchy problem, supported by measurements
of the gauge coupling strengths, consistent with the suggestion from precision
electroweak data that the Higgs boson may be relatively light, and provides a
ready-made candidate for astrophysical cold dark matter. In the first lecture,
constraints on supersymmetric models are reviewed, the problems of fine-tuning
the electroweak scale and the dark matter density are discussed, and a number
of benchmark scenarios are proposed. Then the prospects for discovering and
measuring supersymmetry at the LHC, linear colliders and in non-accelerator
experiments are presented. In the second lecture, the evidence for neutrino
oscillations is recalled, and the parameter space of the seesaw model is
explained. It is shown how these parameters may be explored in a supersymmetric
model via the flavour-changing decays and electric dipole moments of charged
leptons. It is shown that leptogenesis does not relate the baryon asymmetry of
the Universe directly to CP violation in neutrino oscillations. Finally,
possible CERN projects beyond the LHC are mentioned.


title: Theoretical Developments on Hard QCD Processes at Colliders

abstract:
  I review recent theoretical progress on the description of heavy quark, jet
and gauge boson production at colliders within perturbative QCD. Particular
emphasis is put on the improved understanding of fragmentation phenomena,
resummation of large logarithmic corrections and on precision calculations
beyond the next-to-leading order.


title: Prospects for Higgs properties determination at the LHC

abstract:
  The strategies recently developed to study Higgs boson properties at the LHC
are reviewed. It is shown how to obtain model-independent determinations of
couplings to fermions and gauge bosons by exploiting different production and
decay channels. We consider in some detail the case of Weak Boson Fusion Higgs
production with H --> b \bar b as well as the prospects for the determination
of the Higgs self-coupling at the SLHC.


title:
Numerical evaluation of the general massive 2-loop self-mass master
  integrals from differential equations

abstract:
  The system of 4 differential equations in the external invariant satisfied by
the 4 master integrals of the general massive 2-loop sunrise self-mass diagram
is solved by the Runge-Kutta method in the complex plane. The method offers a
reliable and robust approach to the direct and precise numerical evaluation of
Feynman graph integrals.


title: MACRO results on atmospheric neutrino oscillations

abstract:
  In this paper I shall resume the results of the MACRO experiment on
atmospheric muon neutrino oscillations.


title: The ANTARES neutrino telescope

abstract:
  The ANTARES collaboration is building a deep underwater neutrino Cerenkov
telescope at 2400 m which will be located off the Mediterranean sea coast near
Toulon, France. The main scientific aims of the experiment are the detection of
high energy upgoing muons coming from astrophysical neutrinos, indirect dark
matter searches, the study of atmospheric neutrino oscillations. The detector
will be completed in the end of 2004.


title: Bose Einstein Correlations in the Lund Model for Multijet Systems

abstract:
  The interference based analysis of Bose Einstein Correlations in the Lund
Model has hitherto been limited to simple strings without gluonic excitations.
A new fragmentation method based on the Area Law in the Lund Model allows such
an analysis to be extended to multigluon strings.


title: News on Leptogenesis

abstract:
  The possibility to explain the CMB measurement of the baryon asymmetry with
leptogenesis results in a stringent bound on the neutrino masses such that
[(m_1)^2+(m_2)^2+(m_3)^2]^(1/2) < 0.30 eV. We discuss the implications of such
a bound for future experiments on the absolute neutrino mass scale.


title: Direct Urca processes in superdense cores of neutron stars

abstract:
  We use the field theoretical model to perform relativistic calculations of
neutrino energy losses caused by the direct Urca processes on nucleons in the
degenerate baryon matter. By our analysis, in a free nucleon gas under beta
equilibrium, the direct neutron decay is forbidden if the number density of
neutrons exceeds the critical value $n_{n}^{c}=5.9\times 10^{31} cm^{-3}$. In
superdense nuclear matter, $n>n_{0}$, the weak decay of neutrons is possible
only due to strong interactions, caused by an exchange of isovector mesons.
Mean field of isovector mesons in the medium creates a large energy gap between
spectrums of protons and neutrons, which is required by kinematics of beta
decay. Our expression for the neutrino energy losses, obtained in the mean
field approximation, incorporates the effects of nucleon recoil, parity
violation, weak magnetism, and pseudoscalar interaction. For numerical testing
of our formula, we use a self-consistent relativistic model of the
multicomponent baryon matter. The relativistic emissivity of the direct Urca
reactions is found substantially larger than predicted in the non-relativistic
approach. We found that, due to weak magnetism effects, relativistic
emissivities increase by approximately 40-50%.


title:
Plasma effects in neutrino-pair emission due to Cooper pairing of
  protons in superconducting neutron stars

abstract:
  The neutrino emission due to formation and breaking of Cooper pairs of
protons in superconducting cores of neutron stars is considered with taking
into account the electromagnetic coupling of protons to ambient electrons. Our
calculation shows that the contribution of the vector weak current to the
$\nu\bar\nu$ emissivity of protons is much larger than that calculated by
different authors without taking into account the plasma effects. Partial
contribution of the pairing protons to the total neutrino radiation from the
neutron star core is very sensitive to the critical temperatures for the proton
and neutron pairing and can dominate in some domains of these parameters.


title: Numerical evaluation of master integrals from differential equations

abstract:
  The 4-th order Runge-Kutta method in the complex plane is proposed for
numerically advancing the solutions of a system of first order differential
equations in one external invariant satisfied by the master integrals related
to a Feynman graph. The particular case of the general massive 2-loop sunrise
self-mass diagram is analyzed. The method offers a reliable and robust approach
to the direct and precise numerical evaluation of master integrals.


title: Strong Final State Interactions in gamma.gamma --> W+W-

abstract:
  We study the effects of a possible strong final state interaction among
longitudinal W's in gamma.gamma --> W+W-. The relevant partial wave amplitudes
are modified by an Omn\`es function approximated by a Breit-Wigner form factor.
We study the fractional cross section f_{00} = \sigma_{LL}/\sigma_{Total} with
both W's longitudinally polarised, in the presence of a J = 2 resonance (M =
2.5 TeV, Width = 500 GeV) or a J = 0 resonance (M = 1 TeV, Width = 1 TeV),
whose parameters are scaled up from the f_2 and \sigma resonances in the \pi\pi
system. We also examine the effects of final state interaction in the case of
polarised photons (J_z = 0 or J_z = 2), and the impact on the
Drell-Hearn-Gerasimov sum rule.


title: Suppressing FCNC and CP-Violating Phases with Extra Dimensions

abstract:
  The infrared attractiveness of soft-supersymmetry breaking (SSB) parameters
is investigated in extra dimensions. The SSB parameters are assumed to run from
the Planck scale M_{PL} down to the GUT scale M_{GUT}. We find that, even for
M_{PL}/M_{GUT}=100, the SSB parameters in six dimensions can align out of their
anarchical disorder at M_{PL} in such a way that flavor-changing neutral
currents as well as dangerous CP-violating phases are sufficiently suppressed
at M_{GUT}. A concrete, realistic example based on SU(5) in six dimensions is
presented.


title:
Problems of Double Charm Production in $e^+e^-$ Annihilation at
  $\sqrt{s}=10.6$ GeV

abstract:
  Using the nonrelativistic QCD(NRQCD) factorization formalism, we calculate
the color-singlet cross sections for exclusive production processes
${e^++e^-\to J/\psi+\eta_c}$~ and ~$e^++e^-\to J/\psi + \chi_{cJ}$~$(J=0,1,2)$
at the center-of-mass energy $\sqrt{s}$=10.6 GeV. The cross sections are
estimated to be 5.5fb, 6.7fb, 1.1fb, and 1.6fb for $\eta_c, \chi_{c0},
\chi_{c1}$ and $\chi_{c2}$, respectively. The calculated $J/\psi+\eta_c$
production rate is smaller than the recent Belle data by about an order of
magnitude, which might indicate the failure of perturbative QCD calculation to
explain the double-charmonium production data. The complete
$\cal{O}$$(\alpha^2_{s})$ color-singlet cross section for ${e^++e^-\to
\chi_{c0}+ c\bar {c}}$ is calculated. In addition, we also evaluate the ratio
of exclusive to inclusive production cross sections. The ratio of
$J/\psi\eta_c$ production to $J/\psi c\bar{c}$ production could be consistent
with the experimental data.


title: B0 - B0 bar mixing, B -> J/psi K_S and B -> X_d gamma in general MSSM

abstract:
  We consider the gluino-mediated SUSY contributions to B0 - B0 bar mixing, B
-> J/psi K_S and B -> X_d gamma in the mass insertion approximation. We find
the (LL) mixing parameter can be as large as |delta_{13}^d_{LL}| < 2*10^-1, but
the (LR) mixing is strongly constrained by the B -> X_d gamma branching ratio
and we find |delta_{13}^d_{LR}| < 10^-2. The implications for the direct CP
asymmetry in B -> X_d gamma and the dilepton charge asymmetry (A_{ll}) are also
discussed, where substantial deviations from the standard model predictions are
possible.


title:
The problem of hierarchies and family replications in an extension of
  quantum field theory

abstract:
  We will show that an extension of quantum field theory, recently proposed to
solve the hierarchy problem, can give an elegant explanation of quark/lepton
family replications. This scenario prefers fermion mass models based on a
family permutation discrete symmetry.


title:
Renormalization-group running of the cosmological constant and the fate
  of the universe

abstract:
  For a generic quantum field theory we study the role played by the
renormalization-group (RG) running of the cosmological constant (CC) in
determining the ultimate fate of the universe. We consider the running of the
CC of generic origin (the vacuum energy of quantum fields and the potential
energy of classical fields), with the RG scale proportional to the (total
energy density$\rm{)^{1/4}}$ as the most obvious identification. Starting from
the present-era values for cosmological parameters we demonstrate how the
running can easily provide a negative cosmological constant, thereby changing
the fate of the universe, at the same time rendering compatibility with
critical string theory. We also briefly discuss the recent past in our
scenario.


title: Spin Response of the Nucleon in the Resonance Region

abstract:
  I discuss recent results from Jefferson Lab on the measurement of inclusive
spin structure functions in the nucleon resonance region using polarized
electron beams and polarized targets. Results on the first moment of the spin
structure function for protons and neutrons are discussed, as well as the
Bjorken integral. I will argue that the helicity structure of individual
resonances plays a vital role in understanding the nucleon's spin response in
the domain of strong interaction QCD, and must be considered in any analysis of
the nucleon spin structure at low and intermediate photon virtuality.


title: Radiative return at e+e- factories

abstract:
  The energy dependence of the electron - positron hadronic cross section can
be measured not only by a straightforward energy scan, but also by means of the
radiative return method. To provide extensive comparisons between theory and
experiment a Monte Carlo event generator is an indispensable tool. We have
developed such a generator called PHOKHARA, which simulates e+e- -> mesons +
photon(s) processes. In this paper we present its latest tests and upgrades.


title: What is the Magnetic Moment of the Electron?

abstract:
  A direct definition of the intrinsic magnetic moment of the electron is
given, which does not use infrared regularizations and interactions with
external fields. The expression does not depend on the unavoidable ambiguities
of the definition of a 1-electron state (exact form of its soft photon cloud).
The method leads to the same analytic expression as the conventional approach,
thus preserving the excellent agreement between theory and experiment.


title: Unique factorization in perturbative QFT

abstract:
  We discuss factorization of the Dyson--Schwinger equations using the Lie- and
Hopf algebra of graphs. The structure of those equations allows to introduce a
commutative associative product on 1PI graphs. In scalar field theories, this
product vanishes if and only if one of the factors vanishes. Gauge theories are
more subtle: integrality relates to gauge symmetries.


title:
Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk Standard
  Model and Constraint from \Delta \rho

abstract:
  Randall-Sundrum scenario with all the standard model (SM) fermions and gauge
bosons in the bulk is phenomenologically studied. Even though the simple
assumption of universal bulk fermion mass m_\psi leads to the same Kaluza-Klein
(KK) mass spectrum for all the SM fermions and thus suppresses new
contributions to Flavor-Changing-Neutral-Current and the \rho parameter, large
Yukawa coupling of the top quark generates its KK mode mixing and breaks the
degeneracy: unacceptably large contribution to \Delta \rho occurs. With a
different bulk fermion mass to SU(2) singlet bottom quark, we demonstrate that
there exists some parameter space to satisfy the \Delta \rho constraint.


title: Recent status of polarized parton distributions

abstract:
  We study an influence of precise data on uncertainty of polarized parton
distribution functions. This analysis includes the SLAC-E155 proton target data
which are precise measurements. Polarized PDF uncertainties are estimated by
using the Hessian matrix. We examine correlation effect between the antiquark
and gluon uncertainties. It suggests that reducing the gluon uncertainty is
needed to determine the polarized antiquark distribution clearly.


title: O(\alpha^2 L) Radiative Corrections to Deep Inelastic ep Scattering

abstract:
  The leptonic QED radiative corrections are calculated in the next-to-leading
log approximation ${\cal O}[\alpha^2 \ln(Q^2/m_e^2)]$ for unpolarized deeply
inelastic $ep$--scattering in the case of mixed variables. The corrections are
determined using mass factorization in the OMS--scheme for the
double--differential scattering cross sections.


title: Why We Need Both the LHC and an e+e- Linear Collider

abstract:
  We discuss the connection between the understanding of TeV scale physics to
be found at the LHC and a high energy e+e- linear collider, using Higgs
physics, low energy supersymmetry, and the top quark sector as examples.


title: Sudakov Logarithms in Four-Fermion Electroweak Processes at High Energy

abstract:
  We discuss recent results for the asymptotic behavior of fermion scattering
amplitudes in the Sudakov limit. The results include next-to-next-to-leading
logarithmic electroweak corrections and are used for the analysis of
fermion-antifermion pair production in e+e- annihilation at high energy. The
importance of the subleading logarithmic contributions is emphasized and the
fermionic contributions to the Abelian form factor at two loops are discussed.


title: Where do the tedious products of zetas come from?

abstract:
  Lamentably, the full analytical content of the epsilon-expansion of the
master two-loop two-point function, with arbitrary self-energy insertions in
4-2epsilon dimensions, is still unknown. Here we show that multiple zeta values
(MZVs) of weights up to 12 suffice through O(epsilon^9). Products of primitive
MZVs are generated by a processes of "pseudo-exponentiation"" whose
combinatorics faithfully accord with expectations based on Kreimer's modified
shuffle product and on the Drinfeld-Deligne conjecture. The existence of such a
mechanism, relating thousands of complicated rational numbers, enables us to
identify precise and simple combinations of MZVs specific to quantum field
theories in even numbers of spacetime dimensions.


title:
Rare B_s -> \gamma \nu \bar{\nu} decay with polarized photon and new
  physics effects

abstract:
  Using the most general, model independent effective Hamiltonian, the rare B_s
->\gamma \nu \bar{\nu} decay with polarized photon is studied. The sensitivity
of the branching ratio and photon polarization to the new Wilson coefficients
are investigated. It is shown that these physical observables are sensitive to
the vector and tensor type interactions, which would be useful in search of new
physics.


title: Two-loop electroweak corrections at high energies

abstract:
  We discuss two-loop leading and angular-dependent next-to-leading logarithmic
electroweak virtual corrections to arbitrary processes at energies above the
electroweak scale. The relevant Feynman diagrams involving soft-collinear gauge
bosons gamma, Z, W, have been evaluated in eikonal approximation. We present
results obtained from the analytic evaluation of massive loop integrals. To
isolate mass singularities we used the Sudakov method and alternatively the
sector decomposition method in the Feynman-parameter representation.


title: NNLL QCD Corrections to the Decay $B \to X_s \ell^+ \ell^-$

abstract:
  We briefly discuss the status of the NNLL QCD calculations in the inclusive
rare B decay $B \to X_s \ell^+ \ell^-$. Two important ingredients, the two-loop
matrix elements of the four quark operator ${\cal O}_2$ and the bremsstrahlung
contributions, were quite recently finalised. The new contributions
significantly improve the sensitivity of the inclusive decay $B \to X_s l^+
l^-$ decay in testing extensions of the standard model in the sector of flavour
dynamics; for instance the two-loop calculation cuts the low- scale uncertainty
in half and the bremsstrahlung calculation leads to a 10% shift of the position
of the zero of the forward- backward asymmetry.


title:
Sivers effect and transverse single spin asymmetries in Drell-Yan
  processes

abstract:
  Sivers asymmetry, adopted to explain transverse single spin asymmetries (SSA)
observed in inclusive pion production, p(transv. polarized) p --> pion + X and
p-bar(transv. polarized) p --> pion + X is used here to compute SSA in
Drell-Yan processes; in this case, by considering the differential cross
section in the lepton-pair invariant mass, rapidity and transverse momentum,
other mechanisms which may originate SSA cannot contribute. Estimates for RHIC
experiments are given.


title:
A Covariant Path Amplitude Description of Flavour Oscillations: The
  Gribov-Pontecorvo Phase for Neutrino Vacuum Propagation is Right

abstract:
  An extended study is performed of geometrical and kinematical assumptions
used in calculations of the neutrino oscillation phase. The almost universally
employed `equal velocity' assumption, in which all neutrino mass eigenstates
are produced at the same time, is shown to underestimate, by a factor of two,
the neutrino propagation contribution to the phase. Taking properly into
account, in a covariant path amplitude calculation, the incoherent nature of
neutrino production as predicted by the Standard Model, results in an important
source propagator contribution to the phase. It is argued that the commonly
discussed Gaussian `wave packets' have no basis within quantum mechanics and
are the result of a confused amalgam of quantum and classical wave concepts.


title:
The scintillating crystal detector for the dark matter searches
  (proposal)

abstract:
  The study of the crystal scintillating detector (based on pure CsI) is
proposed with the aim of use in future Dark Matter searches. The planned energy
range of the recoil nuclei detection between 2 and 40 KeV allows to register
neutralino interactions with masses up to 100 GeV/c**2.


title:
Single spin asymmetries, unpolarized cross sections and the role of
  partonic transverse momentum

abstract:
  Partonic intrinsic transverse momentum can be essential for the explanation
of large single spin asymmetries in hadronic reactions in the framework of
perturbative QCD. The status of an ongoing program investigating in a
consistent way the role of intrinsic transverse momentum both in unpolarized
and polarized processes is discussed. We compute inclusive cross sections for
hadron and photon production in hadronic collisions and for Drell-Yan
processes; the results are compared with available experimental data in several
different kinematical situations.


title:
New results for hadronic collisions in the framework of the Parton-Based
  Gribov-Regge Theory

abstract:
  We recently proposed a new approach to high energy nuclear scattering, which
treats hadronic collisions in a sophisticated way. Demanding theoretical
consistency as a minimal requirement for a realistic model, we provide a
solution for the energy conservation, screening problems and identical
elementary interactions, the so-called "Parton-Based Gribov-Regge Theory"
including enhanced diagrams. We can now present some of our results for SPS and
RHIC energies.


title: Pseudoscalar neutral mesons in hot and dense matter

abstract:
  The behavior of neutral pseudoscalar mesons $\pi^0, \eta$ and $\eta'$ in hot
and dense matter is investigated, in the framework of the three flavor
Nambu-Jona-Lasinio model. Three different scenarios are considered: zero
density and finite temperature, zero temperature and finite density in a flavor
asymmetric medium with and without strange valence quarks, and finite
temperature and density. The behavior of mesons is analyzed in connection with
possible signatures of restoration of symmetries. In the high density region
and at zero temperature it is found that the mass of the $\eta'$ increases, the
deviation from the mass of the $\eta$ being more pronounced in matter without
strange valence quarks.


title:
MSSM Higgs-Boson Production at the Linear Collider: Dominant Corrections
  to the WW-Fusion Channel

abstract:
  In the Minimal Supersymmetric Standard Model (MSSM) we calculate the
corrections to neutral CP-even Higgs-boson production in the WW-fusion and
Higgs-strahlung channel, e+e- -> \bar nu nu {h,H}, at a future Linear Collider,
taking into account all O(alpha) corrections arising from loops of fermions and
sfermions. For the production of the lightest MSSM Higgs boson, h, we find
genuine loop corrections (beyond the universal Higgs propagator corrections) of
up to -5%. For the heavy CP-even neutral Higgs boson, H, which shows decoupling
behavior at tree level, we find non-negligible corrections that can enhance the
cross section considerably in parts of the MSSM parameter space. At a
center-of-mass energy of \sqrt{s} = 1000 GeV, heavy CP-even Higgs-boson masses
of up to M_H <= 700 GeV are accessible at the Linear Collider in favorable
regions of the MSSM parameter space.


title: Exploring Small Extra Dimensions at the Large Hadron Collider

abstract:
  Many models that include small extra space dimensions predict graviton states
which are well separated in mass, and which can be detected as resonances in
collider experiments. It has been shown that the ATLAS detector at the Large
Hadron Collider can identify such narrow states up to a mass of 2080 GeV in the
decay mode G->ee, using a conservative model. This work extends the study of
the ee channel over the full accessible parameter space, and shows that the
reach could extend as high as 3.5 TeV. It then discusses ways in which the
expected universal coupling of the resonance can be confirmed using other decay
modes. In particular, the mode G-> di-photons is shown to be measurable with
good precision, which would provide powerful confirmation of the graviton
hypothesis. The decays G-> mu mu, WW, ZZ and jet--jet are measurable over a
more limited range of couplings and masses. Using information from mass and
cross-section measurements, the underlying parameters can be extracted. In one
test model, the size of the extra dimension can be determined to a precision in
length of 7x10^-33 m.


title: Precision Analysis of the Lightest MSSM Higgs Boson at Future Colliders

abstract:
  We investigate the sensitivity of observables measurable in e^+ e^-, gamma
gamma and mu^+ mu^- collisions for distinguishing the properties of the light
neutral CP-even Higgs boson in the minimal supersymmetric extension of the
Standard Model (MSSM) from those of a Standard Model (SM) Higgs boson with the
same mass. We explore first the available parameter space in the constrained
MSSM (CMSSM), with universal soft supersymmetry-breaking parameters,
incorporating the most recent direct limits on sparticle and Higgs masses, the
indirect constraints from b to s gamma and g_mu - 2, and the cosmological relic
density. We calculate the products of the expected CMSSM Higgs production cross
sections and decay branching ratios sigma X B normalized by the corresponding
values expected for those of a SM Higgs boson of the same mass. The results are
compared with the precisions expected at each collider, and allow for a direct
comparison of the different channels. The measurements in the Higgs sector are
found to provide important consistency tests of the CMSSM. We then generalize
our analysis to the case of a non-universal Higgs model (NUHM), where the
values of M_A and mu are independent parameters. We explore in particular the
sensitivity to M_A, finding that measurements at e^+ e^-, gamma gamma and mu^+
mu^- colliders could yield indirect constraints on its value, up to M_A ~ 1200
GeV. We discuss the potential of these measurements for distinguishing between
the CMSSM and the NUHM, probing in this way the assumption of universality.


title: Studying the Higgs Sector at the CLIC Multi-TeV $e^+e^-$ Collider

abstract:
  In this paper, we review the role of a multi-TeV $e^+e^-$ linear collider to
complete the mapping of the Higgs boson profile and studying heavier bosons in
extended scenarios with more than one Higgs doublet.


title:
Effect of pre-existing baryon inhomogeneities on the dynamics of
  quark-hadron transition

abstract:
  Baryon number inhomogeneities may be generated during the epoch when the
baryon asymmetry of the universe is produced, e.g. at the electroweak phase
transition. The regions with excess baryon number will have a lower temperature
than the background temperature of the universe. Also the value of the quark
hadron transition temperature $T_c$ will be different in these regions as
compared to the background region. Since a first-order quark hadron transition
is very susceptible to small changes in temperature, we investigate the effect
of the presence of such baryonic lumps on the dynamics of quark-hadron
transition. We find that the phase transition is delayed in these lumps for
significant overdensities. Consequently, we argue that baryon concentration in
these regions grows by the end of the transition. We briefly discuss some
models which may give rise to such high overdensities at the onset of the
quark-hadron transition.


title: DIANA and selected applications

abstract:
  New developments concerning the extension of the Feynman diagram analyzer
DIANA are presented. We discuss new graphics facilities, different approaches
to automation of momenta distribution and parallel processing facilities.
Furthermore applications to $t\bar t$ production and Bhabha scattering are
shortly discussed.


title: Analytic evaluation of Feynman graph integrals

abstract:
  We review the main steps of the differential equation approach to the
analytic evaluation of Feynman graphs, showing at the same time its application
to the 3-loop sunrise graph in a particular kinematical configuration.


title:
Beautified with Goodly Shape: Rethinking the Properties of Large Extra
  Dimensions

abstract:
  Much recent attention has focused on theories with large extra compactified
dimensions. However, while the phenomenological implications of the volume
moduli associated with such compactifications are well understood, relatively
little attention has been devoted to the shape moduli. In this talk, I
demonstrate that non-trivial shape moduli can lead to a number of effects which
are relevant not only for experimental searches for extra dimensions, but also
for the interpretation of experimental data if such extra dimensions are found.
This talk reports on work done partly in collaboration with Arash Mafi.


title: Single Hadronic-Spin Asymmetries in Weak Interaction Processes

abstract:
  We show that measurements of single-spin asymmetries (SSAs) in charged
current weak interaction processes such as deep inelastic neutrino scattering
on a polarized target and inclusive $W$ production in polarized hadron-hadron
collisions discriminate between the two fundamental QCD mechanisms (the Sivers
and Collins effects) which have been proposed to explain such time-reversal-odd
asymmetries. It has recently been shown that QCD final-state interactions due
to gluon exchange between the struck quark and the proton spectators in
semi-inclusive deep inelastic lepton scattering will produce non-zero
Sivers-type single-spin asymmetries which survive in the Bjorken limit. We show
that this QCD final-state interaction produces identical SSAs in charged and
neutral current reactions. Furthermore, the contribution of each quark to the
SSA from this mechanism is proportional to the contribution of that quark to
the polarized baryon's anomalous magnetic moment. In contrast, the Collins
effect contribution to SSAs depends on the transversity distribution of quarks
in the polarized target. Since the charged current only couples to quarks of
one chirality, it cannot sense the transversity distribution of the target, and
thus it gives no Collins-type contribution to single-spin correlations.


title: Relic density of neutralinos in minimal supergravity

abstract:
  We evaluate the relic density of neutralinos in the minimal supergravity
(mSUGRA) model. All 2->2 neutralino annihilation diagrams, as well as all
initial states involving sleptons, charginos, neutralinos and third generation
squarks are included. Relativistic thermal averaging of the velocity times
cross sections is performed. We find that co-annihilation effects are only
important on the edges of the model parameter space, where some amount of
fine-tuning is necessary to obtain a reasonable relic density. Alternatively,
at high tan(beta), annihilation through the broad Higgs resonances gives rise
to an acceptable neutralino relic density over broad regions of parameter space
where little or no fine-tuning is needed.


title: "Subthreshold" $e^+e^-$ pairs production on photon colliders

abstract:
  In this paper we consider the process of "subthreshold" electron-positron
pairs creation in the region of laser conversion. The total number of positrons
and their distribution are obtained. This phenomena is offered for use as a
good test to examine nonlinear effects of quantum electrodynamics on TESLA.


title: Continuum methods in lattice perturbation theory

abstract:
  We show how methods of continuum perturbation theory can be used to simplify
perturbative lattice calculations. We use the technique of asymptotic
expansions to expand lattice loop integrals around the continuum limit. After
the expansion, all nontrivial dependence on momenta and masses is encoded in
continuum loop integrals and the only genuine lattice integrals left are
tadpole integrals. Using integration-by-parts relations all of these can be
expressed in terms of a small number of master integrals. Four master integrals
are needed for bosonic one loop integrals, sixteen in QCD with Wilson or
staggered fermions.


title: The Di-Photon Background to a Light Higgs Boson at the LHC

abstract:
  Recent years have seen a significant advance in our ability to calculate
two-loop matrix elements. In this talk we describe an application of this
breakthrough to improve our understanding of the background to the search for a
light Higgs boson at the LHC. In particular, we focus on the QCD corrections to
the gluon fusion subprocess gg to gamma gamma, which forms an important
component of the background in the di-photon channel. We find that the K factor
for this subprocess is significantly smaller than estimated previously.


title:
Testing of CP, CPT and causality violation with the light propagation in
  vacuum in presence of the uniform electric and magnetic fields

abstract:
  We have considered the structure of the fundamental symmetry violating part
of the photon refractive index in vacuum in the presence of constant electric
and magnetic fields. This part of the refractive index can, in principle,
contain CPT symmetry breaking terms. Some of the terms violate Lorentz
invariance, whereas the others violate locality and causality. Estimates of
these effects, using laser experiments are considered.


title: Constraining the Littlest Higgs

abstract:
  Little Higgs models offer a new way to address the hierarchy problem, and
give rise to a weakly-coupled Higgs sector. These theories predict the
existence of new states which are necessary to cancel the quadratic divergences
of the Standard Model. The simplest version of these models, the Littlest
Higgs, is based on an $SU(5)/SO(5)$ non-linear sigma model and predicts that
four new gauge bosons, a weak isosinglet quark, $t'$, with $Q=2/3$, as well as
an isotriplet scalar field exist at the TeV scale. We consider the
contributions of these new states to precision electroweak observables, and
examine their production at the Tevatron. We thoroughly explore the parameter
space of this model and find that small regions are allowed by the precision
data where the model parameters take on their natural values. These regions
are, however, excluded by the Tevatron data. Combined, the direct and indirect
effects of these new states constrain the `decay constant' $f\gsim 3.5$ TeV and
$m_{t'}\gsim 7 $ TeV. These bounds imply that significant fine-tuning be
present in order for this model to resolve the hierarchy problem.


title: Higher order QED corrections to deep inelastic scattering

abstract:
  We calculate the leptonic ${\cal O}(\alpha^2 L)$ corrections for unpolarized
deeply inelastic ep scattering using mixed variables.


title: Lattice QCD -- from quark confinement to asymptotic freedom

abstract:
  According to the present understanding, the observed diversity of the strong
interaction phenomena is described by Quantum Chromodynamics, a gauge field
theory with only very few parameters. One of the fundamental questions in this
context is how precisely the world of mesons and nucleons is related to the
properties of the theory at high energies, where quarks and gluons are the
important degrees of freedom. The lattice formulation of QCD combined with
numerical simulations and standard perturbation theory are the tools that allow
one to address this issue at a quantitative level.


title: Non-perturbative solution of metastable scalar models

abstract:
  Schwinger-Dyson equations for propagators are solved for the scalar $\Phi^3$
theory and massive Wick-Cutkosky model.
  With the help of integral representation the results are obtained directly in
Minkowski space in and beyond bare vertex approximation. Various
renormalization scheme are employed which differ by the finite strength field
renormalization function $Z$ . The $S-$matrix is puzzled from the Green's
function and the effect of truncation of the DSEs is studied. Independently on
the approximation the numerical solution breaks down for certain critical value
of the coupling constant, for which the on-shell renormalized propagator starts
to develop the unphysical singularity at very high space-like square of
momenta.


title: QCD Evolution of Transversity in Leading and Next-to-Leading Order

abstract:
  I shall present a rather pedagogical discussion of the transversity
distributions in the quark-parton model and, in particular, the role of
perturbative QCD corrections. Among the topics I shall discuss are: LO and NLO
evolution, the Soffer bound and so-called K factors in the Drell-Yan process.
The main conclusion will be that, compared to unpolarised or even
longitudinally polarised hadron scattering, the case of transverse spin should
actually provide a far clearer window onto the workings of QCD and the
interplay with the quark-parton model.


title: Exploring Nucleon Spin Structure in Longitudinally Polarized Collisions

abstract:
  We review how RHIC is expected to deepen our understanding of the spin
structure of longitudinally polarized nucleons. After briefly outlining the
current status of spin-dependent parton densities and pointing out open
questions, we focus on theoretical calculations and predictions relevant for
the RHIC spin program. Estimates of the expected statistical accuracy for such
measurements are presented, taking into account the acceptance of the RHIC
detectors.


title: Determining the Higgs Boson Self Coupling at Hadron Colliders

abstract:
  Inclusive Standard Model Higgs boson pair production at hadron colliders has
the capability to determine the Higgs boson self-coupling, lambda. We present a
detailed analysis of the gg\to HH\to (W^+W^-)(W^+W^-)\to
(jjl^\pm\nu)(jj{l'}^\pm\nu) and gg\to HH\to (W^+W^-)(W^+W^-)\to
(jjl^\pm\nu)({l'}^\pm\nu {l''}^\mp\nu) (l, {l'}, {l''}=e, \mu) signal channels,
and the relevant background processes, for the CERN Large Hadron Collider, and
a future Very Large Hadron Collider operating at a center-of-mass energy of 200
TeV. We also derive quantitative sensitivity limits for lambda. We find that it
should be possible at the LHC with design luminosity to establish that the
Standard Model Higgs boson has a non-zero self-coupling and that lambda /
lambda_{SM} can be restricted to a range of 0-3.8 at 95% confidence level (CL)
if its mass is between 150 and 200 GeV. At a 200 TeV collider with an
integrated luminosity of 300 fb^{-1}, lambda can be determined with an accuracy
of 8 - 25% at 95% CL in the same mass range.


title: The Ideal Mixing Departure in Vector Meson Physics

abstract:
  In this work we study the departure for the ideal $\phi-\omega$ mixing angle
in the frame of the Nambu-Jona-Lasinio model. We have shown that in that
context, the flavour symmetry breaking is unable to produce the shifting in the
mixing angle. We introduce a nonet symmetry breaking in the neutral vector
sector to regulate the non-strange content of the $\phi$ meson. The phenomenon
is well reproduced by our proposal.


title: Infrared renormalons and analyticity structure in pQCD

abstract:
  Relation between the infrared renormalons, the Borel resummation
prescriptions, and the analyticity structure of Green functions in perturbative
QCD (pQCD) is investigated. A specific recently suggested Borel resummation
prescription resulted in the Principal Value and an additional power-suppressed
correction that is consistent with the Operator Product Expansion. Arguments
requiring the finiteness of the result for any power coefficient of the leading
infrared renormalon, and the consistency in the case of the absence of that
renormalon, require that this prescription be modified. The apparently most
natural modification leads to the result represented by the Principal Value.
The analytic structure of the amplitude in the complex coupling plane, obtained
in this way, is consistent with that obtained in the literature by other
methods.


title:
Renormalization-Group Improvement of Effective Actions Beyond Summation
  of Leading Logarithms

abstract:
  Invariance of the effective action under changes of the renormalization scale
$\mu$ leads to relations between those (presumably calculated) terms
independent of $\mu$ at a given order of perturbation theory and those higher
order terms dependent on logarithms of $\mu$. This relationship leads to
differential equations for a sequence of functions, the solutions of which give
closed form expressions for the sum of all leading logs, next to leading logs
and subsequent subleading logarithmic contributions to the effective action.
The renormalization group is thus shown to provide information about a model
beyond the scale dependence of the model's couplings and masses. This procedure
is illustrated using the $\phi_6^3$ model and Yang-Mills theory. In the latter
instance, it is also shown by using a modified summation procedure that the
$\mu$ dependence of the effective action resides solely in a multiplicative
factor of $g^2 (\mu)$ (the running coupling). This approach is also shown to
lead to a novel expansion for the running coupling in terms of the one-loop
coupling that does not require an order-by-order redefinition of the scale
factor $\Lambda_{QCD}$. Finally, logarithmic contributions of the instanton
size to the effective action of an SU(2) gauge theory are summed, allowing a
determination of the asymptotic dependence on the instanton size $\rho$ as
$\rho$ goes to infinity to all orders in the SU(2) coupling constant.


title:
Leptogenesis-MNS Link in Unified Models with Natural Neutrino Mass
  Hierarchy

abstract:
  We discuss the relation between leptogenesis and the MNS phases in the class
of see-saw models called light sequential dominance in which the right-handed
neutrinos dominate sequentially, with the dominant right-handed neutrino being
the lightest one. The heaviest right-handed neutrino then decouples, leaving
effectively two right-handed neutrinos. Light sequential dominance is motivated
by SO(10) models which predict three right-handed neutrinos. With an
approximate Yukawa texture zero in the 11 position there are only two see-saw
phases which are simply related to the MNS phase measurable at a neutrino
factory and the leptogenesis phase. The leptogenesis phase is predicted to be
equal to the neutrinoless double beta decay phase.


title:
Anomalous Gauge Interactions of the Higgs Boson: Precision Constraints
  and Weak Boson Scatterings

abstract:
  Interaction of Higgs scalar (H) with weak gauge bosons (V=W,Z) is the {\it
key} to understand electroweak symmetry breaking (EWSB) mechanism. New physics
effects in the HVV interactions, as predicted by models of compositeness,
supersymmetry and extra dimensions, can be formulated as anomalous couplings
via a generic effective Lagrangian. We first show that the existing electroweak
precision data already impose nontrivial indirect constraints on the anomalous
HVV couplings. Then, we systematically study VV --> VV scatterings in the TeV
region, via Gold-plated pure leptonic decay modes of the weak bosons. We
demonstrate that, even for a light Higgs boson in the mass range 115GeV < m_H <
300GeV, this process can directly probe the anomalous HVV interactions at the
LHC with an integrated luminosity of 300fb^{-1}, which further supports the
``No-Lose'' theorem for the LHC to uncover the EWSB mechanism. Comparisons with
the constraints from measuring the cross section of VH associate production and
the Higgs boson decay width are also given.


title: Is There An Ultimate Symmetry in Physics?

abstract: A speculative discussion on the role of various symmetries in physics.


title: Neutrinos from Accreting Neutron Stars

abstract:
  The magnetospheres of accreting neutron stars develop electrostatic gaps with
huge potential drops. Protons and ions, accelerated in these gaps along the
dipolar magnetic field lines to energies greater than 100 TeV, can impact onto
a surrounding accretion disc. A proton-induced cascade so develops, and
$\nu$-emission is produced from charged pion decays. Using GEANT4, a computer
code that tracks particles produced in high energy collisions, we have
calculated the resulting $\nu$-spectrum with extensive disc shower simulations.
We show that the $\nu$-spectrum produced out of the proton beam is a power law.
We use this result to propose accretion-powered X-ray binaries (with highly
magnetized neutron stars) as a new population of point-like $\nu$-sources for
km-scale detectors, such as ICECUBE. As a particular example we discuss the
case of A0535+26. We show that ICECUBE should find A0535+26 to be a periodic
$\nu$-source: one for which the formation and loss of its accretion disc can be
fully detected. Finally, we briefly comment on the possibility that smaller
telescopes, like AMANDA, could also detect A0535+26 by folding observations
with the orbital period.


title: Single-Spin Asymmetries and Transversity

abstract:
  A pedagogical introduction to single-spin asymmetries (SSA's) and
transversity is presented. Discussion in some detail is made of certain aspects
of (SSA's) in lepton-nucleon and in hadron-hadron scattering and the role of
pQCD and evolution in the context of transversity.


title: Inflatonic Q-ball evaporation: A new paradigm for reheating the Universe

abstract:
  We show that the inflaton condensate associated with a global symmetry can
fragment into quasi stable Q balls after the end of inflation, provided the
inflaton oscillations give rise to an effective equation of state with negative
pressure. We argue that chaotic inflation with a running inflaton mass may give
rise to the desired scenario where the process of fragmentation into inflatonic
Q balls can actually take place even though there is total zero charge. We show
that such inflatonic Q balls will reheat the Universe to a sufficiently low
temperature via surface evaporation.


title:
Axial charge segregation and CP violation during the electroweak phase
  transition with hypermagnetic fields

abstract:
  We study the scattering of fermions off the true vacuum bubbles nucleated
during a first order electroweak phase transition in the presence of a
background hypermagnetic field. By considering the limit of an infinitely thin
bubble wall, we derive and analytically solve the Dirac equation in three
spatial dimensions for left and right chirality modes and compute reflection
and transmission coefficients for the case when the fermions move from the
symmetric toward the broken symmetry phase. Given the chiral nature of the
fermion coupling with the background field in the symmetric phase, an axial
asymmetry is generated during the scattering processes. This mechanism is thus
shown to provide an additional source of CP violation within the standard
model. We discuss possible implications for baryon number generation.


title:
Chiral phase properties of finite size quark droplets in the
  Nambu--Jona-Lasinio model

abstract:
  Chiral phase properties of finite size hadronic systems are investigated
within the Nambu--Jona-Lasinio model. Finite size effects are taken into
account by making use of the multiple reflection expansion. We find that, for
droplets with relatively small baryon numbers, chiral symmetry restoration is
enhanced by the finite size effects. However the radius of the stable droplet
does not change much, as compared to that without the multiple reflection
expansion.


title: Lepton flavor violation in lopsided models and a neutrino mass model

abstract:
  A widely adopted theoretical scheme to account for the neutrino oscillation
phenomena is the see-saw mechanism together with the ``lopsided'' mass
matrices, which is generally realized in the framework of supersymmetric grand
unification. We will show that this scheme leads to large lepton flavor
violation at low energy if supersymmetry is broken at the GUT or Plank scale.
Especially, the branching ratio of $\mu\to e\gamma$ already exceeds the present
experimental limit. We then propose a phenomenological model, which can account
for the LMA solution to the solar neutrino problem and at the same time predict
branching ratio of $\mu\to e\gamma$ below the present limit.


title: Study of Color Transparency in Production of Vector Mesons off Nuclei

abstract:
  Within a light-cone QCD formalism based on the Green function technique
incorporating color transparency, coherence length effects and gluon shadowing
we study electroproduction of vector mesons off nuclei. We found rather large
color transparency effects in the range of Q^2 < 10-20 GeV^2. They are stronger
at low than at high energies and can be easily identified by HERMES or at JLab.
We provide predictions for incoherent and coherent vector meson production for
future measurements.


title: CP Violation in the Higgs Sector and Phase Transition in the MSSM

abstract:
  We investigate the electroweak phase transition in the presence of a large CP
violation in the squark sector of the MSSM. When the CP violation is large,
scalar-pseudoscalar mixing of the Higgs bosons occurs and a large CP violation
in the Higgs sector is induced. It, however, weakens first-order phase
transition before the mixing reaches the maximal. Even when the CP violation in
the squark sector is not so large that the phase transition is strongly first
order, the phase difference between the broken and symmetric phase regions
grows to O(1), which leads to successful baryogenesis, when the charged Higgs
bosons is light.


title: Nonlinear corrections to the DGLAP equations in view of the HERA data

abstract:
  The effects of the first nonlinear corrections to the DGLAP evolution
equations are studied by using the recent HERA data for the structure function
$F_2(x,Q^2)$ of the free proton and the parton distributions from CTEQ5L and
CTEQ6L as a baseline. By requiring a good fit to the H1 data, we determine
initial parton distributions at $Q_0^2=1.4$ GeV$^2$ for the nonlinear scale
evolution. We show that the nonlinear corrections improve the agreement with
the $F_2(x,Q^2)$ data in the region of $x\sim 3\cdot 10^{-5}$ and $Q^2\sim 1.5$
GeV$^2$ without paying the price of obtaining a worse agreement at larger
values of $x$ and $Q^2$. For the gluon distribution the nonlinear effects are
found to play an increasingly important role at $x\lsim 10^{-3}$ and
$Q^2\lsim10$ GeV$^2$, but rapidly vanish at larger values of $x$ and $Q^2$.
Consequently, contrary to CTEQ6L, the obtained gluon distribution at $Q^2=1.4$
GeV$^2$ shows a power-like growth at small $x$. Relative to the CTEQ6L gluons,
an enhancement up to a factor $\sim6$ at $x=10^{-5}$, $Q_0^2=1.4$ GeV$^2$
reduces to a negligible difference at $Q^2\gsim 10$ GeV$^2$.


title: Three-body Baryonic anti-B -->Lambda anti-p pi Decays and Such

abstract:
  We study decay rates and spectra of anti-B --> Lambda anti-p pi, Sigma0
anti-p pi, Sigma- anti-n pi, Xi0 anti-Sigma+ pi, Xi- anti-Sigma0 pi and Xi-
anti-Lambda pi modes under a factorization approach. The baryon pairs are
produced through vector, axial vector, scalar and pseudoscalar operators.
Previous predictions, including ours, are an order of magnitude too small
compared to experiment. By incorporating QCD counting rules and studying the
asymptotic behavior, we find an earlier relation between the pseudoscalar and
axial vector form factors to be too restrictive. Instead, the pseudoscalar and
scalar form factors are related asymptotically. Following this approach, the
measured Lambda anti-p pi rate (~4.0x10^{-6}) and spectrum can be understood,
and Lambda should be dominantly left-hand polarized, while we expect Br(Sigma0
anti-p pi)~1.6x10^{-6}. These results and other predictions can be checked
soon.


title: On the extra factor of two in the phase of neutrino oscillations

abstract:
  Attempts to modify the standard expression for the phase in neutrino
oscillations by an extra factor of two are based on misuse of quantum
mechanics. Claims to present Bruno Pontecorvo and his coauthors as
``godfathers'' of this ``extra 2'' factor are easily disproved by unbiased
reading their articles.


title: Twisted Moduli and Supersymmetry Breaking

abstract:
  We discuss how localized twisted moduli in type I string theory can provide a
string realization of brane world supersymmetry breaking models.


title:
Chern-Simons number asymmetry from CP violation at electroweak tachyonic
  preheating

abstract:
  We consider the creation of non-zero Chern-Simons number in a model of the
early Universe, where the Higgs field experiences a fast quench at the end of
inflation and subsequently rolls down its potential barrier. Neglecting the
expansion, we perform numerical lattice simulations in the Abelian Higgs model
in 1+1 dimensions with an added phenomenological C and P violating term during
this stage of so-called tachyonic preheating. The results suggest that even the
sign of the Chern-Simons and thus baryon number is dependent on the ratio of
the Higgs to W mass. We also discuss the appropriate choice of vacuum initial
conditions for classical simulations.


title:
Contributions due to the longitudinal virtual photon in the
  semi-inclusive ep collision at HERA

abstract:
  The importance of contributions due to the longitudinally polarised virtual
photon and the longitudinal-transverse interference term, in the unpolarised ep
collisions is discussed. The numerical calculations for the Compton process, e
p --> e gamma X, at the HERA collider were performed in the Born approximation.
The various distributions in the ep centre-of-mass and Breit frames are
presented. These cross sections are dominated by the transversely polarised
intermediate photon, even for large values of its virtuality.


title: Experimental Results on Heavy Quarks

abstract:
  This paper reviews the results presented at the 31st ICHEP on Heavy Quarks,
with emphasis on those related to the determinationof the unitarity triangle
parameters.


title: Role of T-odd functions in high energy hadronic collisions

abstract:
  I propose a simple model for predicting the enegy behavior of T-odd, chiral
odd function $h_1^{\perp}$. Furthermore I illustrate a method for extracting
$h_1^{\perp}$ and the transversity function from Drell-Yan. The method may be
applied also to other reactions.


title: Phenomenology of Non-Commutative Field Theories

abstract:
  We study the effects of non-commutative QED (NCQED) in fermion pair
production, gamma + gamma to f + \bar{f} and Compton scattering, e + gamma to e
+ gamma. Non-commutative geometries give rise to 3- and 4-point photon vertices
and to momentum dependent phase factors in QED vertices which will have
observable effects in high energy collisions. We consider e^+ e^- colliders
with energies appropriate to the TeV Linear Collider proposals and the
multi-TeV CLIC project operating in gamma gamma and e gamma modes.
Non-commutative scales roughly equal to the center of mass energy of the e^+e^-
collider can be probed, with the exact value depending on the model parameters
and experimental factors. The Compton process is sensitive to Lambda_{NC}
values roughly twice as large as those accessible to the pair production
process.


title: NLO QCD Corrections to A_LL^pi

abstract:
  We present a calculation for single-inclusive large-p_T pion production in
longitudinally polarized pp collisions in next-to-leading order QCD. The
corresponding double-spin asymmetry A_LL^pi for this process will soon be used
at BNL-RHIC to measure Delta g.


title: Tau EDM at Low Energies

abstract:
  Low energy tau pair production, at B factories and on top of the $\Upsilon$
resonances, allows for a detailed investigation on the CP violation at the
electromagnetic tau pair production vertex. High statistic available at low
energies offers the opportunity for an independent analysis of CP-violation in
the $\tau$ lepton physics. We show that stringent and independent bounds on the
$\tau$ electric dipole moment, competitive with the high energy measurements,
can be established in low energies experiments.


title: Observational Tests of Open Strings in Braneworld Scenarios

abstract:
  We consider some consequences of describing the gauge and matter degrees of
freedom in our universe by open strings, as suggested by the braneworld
scenario. We focus on the geometric effects described by the open string metric
and investigate their observational implications. The causal structure of
spacetime on the brane is altered; it is described not by the usual metric
$g_{\mu\nu}$, but instead by the open string metric, that incorporates the
electromagnetic background, $G_{\mu\nu} = g_{\mu\nu} - (2\pi \alpha^\prime)^2
(F^2)_{\mu\nu}$. The speed of light is now slower when propagating along
directions transverse to electromagnetic fields or an NS-NS two form, so that
Lorentz invariance is explicitly broken. A generalized equivalence principle
guarantees that the propagation of {\it all} particles, not just photons, (with
the exception of gravitons) is slower in these transverse directions. We
describe a variety of astrophysical and laboratory-based experiments designed
to detect the predicted variations in the causal structure. We show that
current technology cannot probe beyond open string lengths of $10^{-13}$ cm,
corresponding to MeV string scales. We also point out that in a braneworld
scenario, constraints on large scale electromagnetic fields together with a
modest phenomenological bound on the NS-NS two-form naturally lead to a bound
on the scale of canonical noncommutativity that is two orders of magnitude
below the string length. By invoking theoretical constraints on the NS-NS
two-form this bound can be improved to give an extremely strong bound on the
noncommutative scale well below the Planck length, $\sqrt{|\theta|_{max}} <
10^{-35} {\rm cm} \times ({{\rm TeV} \over {\rm string} {\rm scale}}


title: A Complete Basis for Power Suppressed Collinear-Ultrasoft Operators

abstract:
  We construct operators that describe power corrections in mixed
collinear-ultrasoft processes in QCD. We treat the ultrasoft-collinear
Lagrangian to O(lambda^2), and heavy-to-light currents involving collinear
quarks to O(\lambda) including new three body currents. A complete gauge
invariant basis is derived which has a full reduction in Dirac structures and
is valid for matching at any order in alpha_s. The full set of
reparameterization invariance (RPI) constraints are included, and are found to
restrict the number of parameters appearing in Wilson coefficients and rule out
some classes of operators. The QCD ultrasoft-collinear Lagrangian has two
O(lambda^2) operators in its gauge invariant form. For the O(lambda)
heavy-to-light currents there are (4,4,14,14,21) subleading (scalar,
pseudo-scalar, vector, axial-vector, tensor) currents, where (1,1,4,4,7) have
coefficients that are not determined by RPI. In a frame where v_perp=0 and n.v
=1 the total number of currents reduces to (2,2,8,8,13), but the number of
undetermined coefficients is the same. The role of these operators and
universality of jet functions in the factorization theorem for heavy-to-light
form factors is discussed.


title: ICTP Lectures on Theoretical Aspects of Neutrino Masses and Mixings

abstract:
  Recent neutrino oscillation experiments are yielding valuable information on
the nature of neutrino masses and mixings even though we are far from a
complete understanding of the new physics implied by them. In these lectures, I
summarize the current theoretical status of neutrino mass physics.


title: What are we learning from RHIC?

abstract:
  This talk is an attempt to summarize some of the first results obtained at
RHIC. I discuss the significance of these measurements for establishing the
properties of hot and dense QCD matter and for understanding the dynamics of
the theory at the high parton density, strong color field frontier.


title: Axions and their Distribution in Galactic Halos

abstract:
  Axion physics is briefly reviewed. Constraints from laboratory searches,
astrophysics and cosmology require the axion mass to be in the range $10^{-6}
\lesssim m_a < 3\cdot 10^{-3}$eV. Near the lower end of this range, axions are
all or a major component of the cold dark matter of the universe. The late
infall of axions, and of any other cold dark matter particles, onto our galaxy
produces streams and caustics in its halo. The outer caustics are topological
spheres whereas the inner caustics are rings. The self-similar model of
galactic halo formation predicts that the caustic ring radii $a_n$ obey the
approximate law $a_n \sim 1/n$. Evidence for this law has been found in a
statistical study of 32 extended and well-measured external galactic rotation
curves, and in the existence and distribution of sharp rises in the Milky Way
rotation curve. Moreover, a triangular feature in the IRAS map of the Galactic
plane is consistent with the imprint of a ring caustic upon the baryonic
matter. Its position coincides with a rise in the rotation curve, the one
nearest to us. These observations imply that the dark matter in our
neighborhood is dominated by a single flow. Estimates of that flow's density
and velocity vector are given.