title:
Flavor-dependent CP violation and electroweak baryogenesis in
  supersymmetric theories

abstract:
  We analyze electroweak baryogenesis in supersymmetric theories with
flavor-dependent CP-violating phases. We generalize the standard approach to
include the flavor dependence of the CP-violating sources and obtain an
analytical approximate expression for the baryon asymmetry of the universe
induced by these sources. It is shown that in the framework where the
$\mu$-term is real and the chargino sources vanish, large flavor mixing might
lead to a substantial baryon asymmetry through the squark contributions, once
the condition to have a strong first-order phase transition induced by light
right-handed up squarks is relaxed. We derive model independent bounds on the
relevant up-squark left-right mass insertions. We show that in supersymmetric
models with non-minimal flavor structure these bounds can be reached and the
required baryon asymmetry can be generated, while satisfying the constraints
coming from the electric dipole moments.


title:
Deep inelastic J/Psi production at HERA in the colour singlet model with
  k_T-factorization

abstract:
  We consider J/Psi meson production in $ep$ deep inelastic scattering in the
colour singlet model using the k_T-factorization QCD approach. We investigate
the z-, Q^2-, p_T^2-, y^*- and W-dependences of inelastic J/Psi production on
different forms of the unintegrated gluon distribution. The p_T^2- and
Q^2-dependences of the J/Psi spin aligment parameter alpha are presented also.
We compare the theoretical results with recent experimental data taken by the
H1 and ZEUS collaborations at HERA. It is shown that experimental study of the
polarization J/Psi mesons at Q^2 < 1 {GeV}^2 is an additional test of BFKL
gluon dynamics.


title: Polarization of Prompt J/psi and Upsilon(nS)

abstract:
  We review predictions, based on the nonrelativistic QCD factorization
framework, for the polarizations of prompt J/psi's and Upsilon(nS)'s produced
at the Fermilab Tevatron. We also discuss the effect of relativistic
corrections on the theoretical prediction for the polarization of prompt
J/psi's at the Tevatron.


title: Parity Violation and Neutrino Mass

abstract:
  Besides the fact of parity violation in weak interactions, based on evidences
from neutrino oscillation and tritium beta decay, a natural conjecture is that
neutrinos may be spacelike particles with a tiny proper mass. A Dirac-type
equation for spacelike neutrinos is further investigated and its solutions are
discussed. This equation can be written in two spinor equations coupled
together via nonzero proper mass while respecting maximum parity violation.


title:
Signals of anomaly mediated supersymmetry breaking in an e^- gamma
  collider

abstract:
  We study the signatures of minimal anomaly mediated supersymmetry breaking in
an e^- gamma collider. We demonstrate that the associated production of a
sneutrino with the lightest chargino leads to a substantially large signal
size. The background is negligibly small, though. Even more interestingly, a
measurement of the fundamental supersymmetry breaking parameters could be
possible.


title: Superhorizon curvaton amplitude in inflation and pre-big bang cosmology

abstract:
  We follow the evolution of the curvaton on superhorizon scales and check that
the spectral tilt of the curvaton perturbations is unchanged as the curvaton
becomes non-relativistic. Both inflation and pre-big bang cosmology can be
treated since the curvaton mechanism within the two scenarios works the same
way. We also discuss the amplitude of the density perturbations, which leads to
some interesting constrains on the pre-big bang scenario. It is shown that
within a SL(3,R) non-linear sigma model one of the three axions has the right
coupling to the dilaton and moduli to yield a flat spectrum with a high string
scale, if a quadratic non-perturbative potential is generated and an
intermediate string phase lasts long enough.


title: Nucleon strangeness and spin crisis?

abstract:
  We summarize three alternative extensions of the quark-valence picture of
nucleon strangeness and spin, including (1) gluon spin in QCD, (2) Bjorken sum
rule and QCD, (3) D--E meson mixing and tadpole leakage. All three approaches
suggest that ~40% of the nucleon's spin (as well as its momentum) resides with
quarks, but that less than 6% is due to strange quarks.


title:
Conference Summary (5th Int. Conf. on Hyperons, Charm, and Beauty
  Hadrons)

abstract:
  A summary is given of the 5th International Conference on Hyperons, Charm and
Beauty Hadrons held in Vancouver, Canada, June 25th to 29th, 2002. This series
of conferences began in 1995 in Strasbourg, France, in large part through the
efforts of A. Fridman, to whose memory this talk is dedicated. Topics reviewed
include kaon and hyperon physics, charm and beauty production and decays, heavy
baryons, the physics of the Cabibbo-Kobayashi-Maskawa matrix and CP violation,
and precision electroweak analyses. An attempt is made to combine a review of
the high points of the conference with a more general overview of the field and
its prospects.


title:
Possible Evidence for a Chiral Particle D_1chi, Axial-Vector in the D
  Meson System

abstract:
  In the covariant level-classification scheme of hadrons proposed recently,
the existence of "chiral particles", scalar and axial-vector mesons as the
partners of the ground-state pseudo-scalar and vector mesons, respectively,
were predicted in the D and B meson systems, realizing a linear representation
of chiral symmetry. In this work we reanalyze the D* pi mass spectra obtained
through the Upsilon (4S) and Z0 decays to show a possibility for the D_1chi.


title:
Possible Evidence for a Chiral Particle B_0chi, Scalar Meson in the B
  Meson System

abstract:
  In the covariant level-classification scheme of hadrons proposed recently,
the existence of "chiral particles", scalar and axial-vector mesons as the
partners of the ground-state pseudo-scalar and vector mesons, respectively,
were predicted in the D meson and B meson systems, realizing a linear
representation of chiral symmetry. In this work we reanalyze the B0 pi mass
spectra through Z0 decays to show a possibility for the scalar B_0chi.


title:
Thermal Model Description of Strangeness Enhancement at Mid-Rapidity in
  Pb--Pb collisions at 158 GeV A/c

abstract:
  The results of the WA97 collaboration for strange particle production at
mid-rapidity in Pb--Pb collisions at 158 GeV A/c at CERN display a strong
strangeness enhancement with system size at mid-rapidity which is dependent on
the strangeness of the particle concerned, and saturates at values of
participating nucleons greater than 120. These results are phenomenologically
described by the mixed canonical ensemble, with canonical (exact) strangeness
conservation involving all strange resonances, and grand canonical conservation
of charge and baryon number. A detailed quantitative analysis shows that the
data are well described by an equilibrium (gamma_S equivalent to 1) hadron gas.


title:
Towards strangeness saturation in central heavy-ion collisions at high
  energies

abstract:
  Analyses of the centrality binned identified hadron multiplicities at SPS and
RHIC within the statistical-thermal model point to strangeness saturation with
increasing centrality and energy.


title: Which blazars are neutrino loud?

abstract:
  Protons accelerated in the cores of active galactic nuclei can effectively
produce neutrinos only if the soft radiation background in the core is
sufficiently high. We find restrictions on the spectral properties and
luminosity of blazars under which they can be strong neutrino sources. We
analyze the possibility that neutrino flux is highly beamed along the rotation
axis of the central black hole. The enhancement of neutrino flux compared to
GeV gamma-ray flux from a given source makes the detection of neutrino point
sources more probable. At the same time the smaller open angle reduces the
number of possible neutrino-loud blazars compared to the number of gamma-ray
loud ones. We present the table of 15 blazars which are the most likely
candidates for the detection by future neutrino telescopes.


title:
Higher-Dimensional Origin of Heavy Sneutrino Domination and Low-Scale
  Leptogenesis

abstract:
  If the expectation value of the right-handed (rhd) sneutrino comes to
dominate the universe, its decay naturally leads to successful leptogenesis, as
well as significant dilution of dangerous inflationary relics, such as the
gravitino. The resulting baryon asymmetry is independent of other cosmological
initial conditions. This attractive variant of leptogenesis requires at least
one of the rhd neutrinos to have small Yukawa coupling and to have mass ~ 10^6
GeV, much smaller than the grand unified (GUT) scale. We show that these
features naturally arise in the context of independently motivated and
successful 5d orbifold GUTs with inverse-GUT-scale-sized extra dimensions. Rhd
neutrinos are realized as bulk fields N_i with 5d bulk masses, while Yukawa
couplings and lepton-number-violating masses for the N_i are localized at the
SM boundary. The exponential suppression of the would-be N_i zero-modes leads
to the desired small 4d Yukawa couplings and small masses for the rhd neutrino
states. The see-saw prediction for the lhd neutrino mass scale is automatically
maintained. We show that this realization of rhd neutrinos is nicely
accommodated within an attractive orbifold-GUT flavour model, where all flavour
hierarchies have a geometrical origin.


title: Axial Vector Current and Coupling of the Quark in the Instanton Model

abstract:
  We compute the axial vector current, form factor, and coupling for quarks in
the instanton liquid model with two light flavors. Non-local current
corrections are derived, as required by the effective 't Hooft interaction. We
obtain a pion-mediated axial form factor and an axial coupling which, when
simply applied in the non-relativistic limit for constituent quarks, matches
the experimental value to within a few percent, both in and out of the chiral
limit.


title: The Muon g-2 Revisited

abstract:
  I present a short review of the present status of the Standard Model
prediction of the anomalous magnetic moment of the muon, with special emphasis
on the hadronic contributions.


title: Coulomb induced diffraction of energetic hadrons into jets

abstract:
  The electromagnetic (e.m.) current conservation and renormalizability of QCD
are used to calculate the amplitude of energetic hadron(photon) diffraction
into several jets with large relative transverse momenta off the
nucleon(nucleus) Coulomb field. Numerical estimates of the ratio of e.m. and
strong amplitudes show that within the kinematic range where the leading twist
approximation for the strong amplitude is applicable, the e.m. contribution can
be neglected. In pA scattering at LHC and in the fragmentation of a photon into
two jets in ultraperipheral AA collisions in the black limit (which maybe
realistic at LHC) e.m. contribution may win.


title: Ratio of Photoproduction Rates of $\jpsi$ and $\psi(2S)$

abstract:
  There are different approaches for diffractive photoproduction of charmonia.
Recently, a new approach is proposed, in which charm quarks are taken as heavy
quarks and the nonperturbative effect related to charmonia can be handled with
nonrelativistic QCD. The interaction between the $c\bar c$ pair and the initial
hadron is through exchange of soft gluons. The exchange of soft gluons can be
studied with heavy quark effective theory and an expansion in the inverse of
charm quark mass $m_c$ can be employed. In this approach a simple formula for
the S-matrix can be derived by neglecting higher orders in $m_c^{-1}$ and
relativistic correction related to charmonia. The S-matrix is related to the
usual gluon distribution $g(x)$ at small $x$. This result is different than
those from other approaches. Confronting experiment the result is not in
agreement with experimental measurement because large errors from higher order
in $m_c^{-1}$ and from relativistic corrections. Nevertheless the ratio of
cross sections of $\jpsi$ and $\psi(2S)$ can be predicted more precisely than
cross-sections. In this letter we show that the ratio predicted in this
approach with an estimation of relativistic corrections is in good agreement
with the recent measurement at HERA.


title: Triplet Higgs boson at hadron colliders

abstract:
  The novel feature of a Higgs-triplet representation is a nonzero tree-level
coupling of $H^+ W^- Z$, which is absent in all Higgs-doublet models. We study
the associated production of a singly-charged Higgs boson of the Higgs-triplet
representation with a $W$ or $Z$ boson at hadron colliders, followed by the
$H^+ \to W^+ Z$ decay. We find that the $2\ell+4j$ final state gives an
interesting level of signal with a negligible background, plus it allows a full
mass reconstruction of the charged-Higgs boson. The cover range of the
charged-Higgs mass is between 110 and 200 GeV.


title: Reaction of the fermion field on spontaneous change of its mass

abstract:
  Modification of the particles in the course of the source evolution is
considered. Influence of this effect on multiplicities and correlations of the
particles is displayed, including an enhancement of the production rates and
identical particle correlations and also back-to-back particle-antiparticle
correlations.


title: Gauge invariance and form factors for the decay B --> gamma l^+l^-

abstract:
  We analyse the form factors for the B --> gamma l^+l^- weak transition. We
show that making use of the gauge invariance of the B --> gamma l^+l^-
amplitude, the structure of the form factors in the resonance region, and their
relations at large values of the photon energy results in efficient constraints
on the behavior of the form factors. Based on these constraints, we propose a
simple parametrization of the form factors and apply it to the lepton
forward-backward (FB) asymmetry in the B --> gamma l^+l^- decay. We find that
the behavior of the FB asymmetry as a function of the photon energy, as well as
the location of its zero, depend only weakly on the B --> gamma l^+l^- form
factors, and thus constitutes a powerful tool for testing the standard model.


title: Hadronic EDMs, the Weinberg Operator, and Light Gluinos

abstract:
  We re-examine questions concerning the contribution of the three-gluon
Weinberg operator to the electric dipole moment of the neutron, and provide
several QCD sum rule-based arguments that the result is smaller than - but
nevertheless consistent with - estimates which invoke naive dimensional
analysis. We also point out a regime of the MSSM parameter space with light
gluinos for which this operator provides the dominant contribution to the
neutron electric dipole moment due to enhancement via the dimension five color
electric dipole moment of the gluino.


title: Quark-hadron duality in electron-pion scattering

abstract:
  We explore the relationship between exclusive and inclusive electromagnetic
scattering from the pion, focusing on the transition region at intermediate
Q^2. Combining Drell-Yan data on the leading twist quark distribution in the
pion with a model for the resonance region at large x, we calculate QCD moments
of the pion structure function over a range of Q^2, and quantify the role of
higher twist corrections. Using a parameterization of the pion elastic form
factor and phenomenological models for the pi -> rho transition form factor, we
further test the extent to which local duality may be valid for the pion.


title: Variation of Fine Structure Constant from Non-Universal Gravity

abstract:
  We relate the reported variation in the value of the fine structure constant
to a possible non-universality of the gravitational interaction with respect to
different particle generations.


title: Nucleon Compton Scattering with Two Space--Like Photons

abstract:
  We calculated two--photon exchange effects for elastic electron--proton
scattering at high momentum transfers. The corresponding nucleon Compton
amplitude is defined by two space--like virtual photons that appear to have
significant virtualities. We make predictions for a) a single--spin beam
asymmetry, and b) a single--spin target asymmetry or recoil proton polarization
caused by an unpolarized electron beam.


title: Probing Kaluza-Klein Dark Matter with Neutrino Telescopes

abstract:
  In models in which all of the Standard Model fields live in extra universal
dimensions, the lightest Kaluza-Klein (KK) particle can be stable. Calculations
of the one-loop radiative corrections to the masses of the KK modes suggest
that the identity of the lightest KK particle (LKP) is mostly the first KK
excitation of the hypercharge gauge boson. This LKP is a viable dark matter
candidate with an ideal present-day relic abundance if its mass is moderately
large, between 600 to 1200 GeV. Such weakly interacting dark matter particles
are expected to become gravitationally trapped in large bodies, such as the
Sun, and annihilate into neutrinos or other particles that decay into
neutrinos. We calculate the annihilation rate, neutrino flux and the resulting
event rate in present and future neutrino telescopes. The relatively large mass
implies that the neutrino energy spectrum is expected to be well above the
energy threshold of AMANDA and IceCube. We find that the event rate in IceCube
is between a few to tens of events per year.


title: Distinguishing scalar from pseudoscalar Higgs production at the LHC

abstract:
  In this letter we examine the production channels for the scalar or
pseudoscalar Higgs plus two jets at the CERN Large Hadron Collider (LHC). We
identify possible signals for distinguishing between a scalar and a
pseudoscalar Higgs boson.


title:
Harmony of the Froissart Theorem in Fundamental Dynamics of Particles
  and Nuclei

abstract:
  It has been shown that the great ancient Pythagorean ideas have found
themselves in the latest researches in high energy elementary particles and
nuclear physics. In this respect we concern and discuss the mathematical,
physical and geometrical aspects of the famous Froissart theorem and in this
way one establishes a link of this theorem to the mathematics and ideas
elaborated in the Pythagorean school. A harmony of the Froissart theorem in
fundamental dynamics of particles and nuclei has been displayed. We argue that
a harmony of the Froissart theorem allow us to hear the new notes of {\it ``the
music of the spheres"} just in the Pythagoreans sense.


title:
Generalized Cardassian Expansion: Models in Which the Universe is Flat,
  Matter Dominated, and Accelerating

abstract:
  The Cardassian universe is a proposed modification to the Friedmann Robertson
Walker (FRW) equation in which the universe is flat, matter dominated, and
accelerating. Here we generalize the original Cardassian proposal to include
additional variants on the FRW equation. Specific examples are presented.
  In the ordinary FRW equation, the right hand side is a linear function of the
energy density, $H^2 \sim \rho$. Here, instead, the right hand side of the FRW
equation is a different function of the energy density, $H^2 \sim g(\rho)$.
This function returns to ordinary FRW at early times, but modifies the
expansion at a late epoch of the universe. The only ingredients in this
universe are matter and radiation: in particular, there is {\it no} vacuum
contribution. Currently the modification of the FRW equation is such that the
universe accelerates. The universe can be flat and yet consist of only matter
and radiation, and still be compatible with observations. The energy density
required to close the universe is much smaller than in a standard cosmology, so
that matter can be sufficient to provide a flat geometry. The modifications may
arise, e.g., as a consequence of our observable universe living as a
3-dimensional brane in a higher dimensional universe. The Cardassian model
survives several observational tests, including the cosmic background
radiation, the age of the universe, the cluster baryon fraction, and structure
formation. As will be shown in future work, the predictions for observational
tests of the generalized Cardassian models can be very different from generic
quintessence models, whether the equation of state is constant or time
dependent.


title: Taming the BFKL Intercept via Gluon Saturation

abstract:
  We show that the inclusion of parton density effects in the perturbative
small-x evolution reduces the strength of the powerlike growth of total
hadronic cross sections.


title: Neutrino Mass Models

abstract:
  I review promising approaches to neutrino mass models, focussing on three
neutrino patterns of neutrino masses and mixing angles, and the corresponding
Majorana mass matrices. I discuss the see-saw mechanism, and show how it may be
applied in a very natural way to give a neutrino mass hierarchy with large
atmospheric and solar angles by assuming single right-handed neutrino
dominance. A theoretical framework for understanding quark and lepton
(including neutrino) masses and mixing angles based on SUSY, GUTs and Family
symmetry is then described, and sample models which involve single right-handed
neutrino dominance are discussed.


title:
The curvaton as a Bose-Einstein condensate of chiral pseudo
  Nambu-Goldstone bosons

abstract:
  Explaining cosmic inflation by the effective dynamics of an $SU(N_C)$ pure
gauge theory of scale $\La\sim 10^{-6} M_p$ is lacking an explanation of the
(Gaussian) spatial curvature perturbations needed to seed the formation of
large-scale structure after inflation. In this work it is demonstrated how
fundamentally charged fermions of mass $m_F\sim 10^{-12} \La$, whose
approximate chiral symmetry is spontaneously broken during inflation, can cure
this shortcoming. The associated gas of weakly interacting pseudo
Nambu-Goldstone bosons (PNGB) undergoes Bose-Einstein (BE) condensation well
before the end of inflation. This causes the occurence of condensed light
scalar fields effectively acting as a curvaton. Fermions may also be charged
under a gauge group $G$ with a weak coupling $g$. Since fermions charged under
$SU(N_C)$ are confined after inflation the decay of Nambu-Goldstone bosons,
which reside in the condensates and in the PNGB radiation generated at
reheating, is mainly into fermions {\sl solely} charged under $G$. The
associated decay rate $\Gamma$ is estimated using PCAC and large $N_C$
counting. PNGB decay takes place during radiation domination after cosmological
scales have entered the horizon. Neglecting the effects of the spontaneous
breaking of G induced by the BE condensation, it is demonstrated that the
observed spectrum of spatial curvature perturbations $P^{1/2}_\xi\sim 5\times
10^{-5}$ is compatible with $g\sim 10^{-3}$, a ratio $r_{\tiny{dec}}\sim
10^{-4}$ of curvaton to radiation energy at PNGB decay, and a curvaton
effective equation of state $p_{\tiny{curv}}=-0.9 \rho_{\tiny{curv}}$.


title: Non-thermal leptogenesis with almost degenerate superheavy neutrinos

abstract:
  We present a model with minimal assumptions for non-thermal leptogenesis with
almost degenerate superheavy right-handed neutrinos in a supersymmetric set up.
In this scenario a gauge singlet inflaton is directly coupled to the
right-handed (s)neutrinos with a mass heavier than the inflaton mass. This
helps avoiding potential problems which can naturally arise otherwise. The
inflaton decay to the Standard Model leptons and Higgs, via off-shell
right-handed (s)neutrinos, reheats the Universe. The same channel is also
responsible for generating the lepton asymmetry, thus requiring no stage of
preheating in order to excite superheavy (s)neutrinos. The suppressed decay
rate of the inflaton naturally leads to a sufficiently low reheat temperature,
which in addition, prevents any wash out of the yielded asymmetry. We will
particularly elaborate on important differences from leptogenesis with on-shell
(s)neutrinos. It is shown that for nearly degenerate neutrinos a successful
leptogenesis can be accommodated for a variety of inflationary models with a
rather wide ranging inflationary scale.


title: Silicon Detectors at the LHC

abstract:
  The silicon systems of the Large Hadron Collider (LHC) detectors are briefly
described. The complexity and diversity of the projects are illustrated by
highlighting for discussion different components of the silicon systems in each
experiment.


title: String Inspired Neutrino Mass Models

abstract:
  I discuss a class of hierarchical neutrino mass models based on the see-saw
mechanism with single right-handed neutrino dominance. I apply this mechanism
to a string inspired SUSY Pati-Salam model and indicate how it may emerge from
intersecting D-branes.


title:
Tests of the nature and of the gluon content of the \sigma(0.6) from D
  and D_{s} semileptonic decays

abstract:
  We summarize the different features which show that QCD spectral sum rule
analyses of the scalar two- and three-point functions do not favour the $\bar
uu+\bar dd$ interpretation of the broad and low mass $\sigma (0.6)$ and
emphasize that a measurement of the $D_s$ semileptonic decays into $\pi\pi$ can
reveal in a model-independent way its eventual gluon component $\sigma_B$. The
analysis also implies that one expects an observation of the $K\bar K$ final
states from the $\sigma_B$ which may compete (if phase space allowed) with the
one from a low mass $\bar ss$ state assumed in the literature to be the SU(3)
partner of the observed $\sigma (0.6)$ if the latter is a $\bar uu+\bar dd$
state


title: Magnetic field generation from non-equilibrium phase transitions

abstract:
  We study the generation of magnetic fields during the stage of particle
production resulting from spinodal instabilities during phase transitions out
of equilibrium. The main premise is that long-wavelength instabilities that
drive the phase transition lead to strong non-equilibrium charge and current
fluctuations which generate electromagnetic fields. We present a formulation
based on the non-equilibrium Schwinger-Dyson equations that leads to an exact
expression for the spectrum of electromagnetic fields valid for general
theories and cosmological backgrounds and whose main ingredient is the
transverse photon polarization out of equilibrium. This formulation includes
the dissipative effects of the conductivity in the medium. As a prelude to
cosmology we study magnetogenesis in Minkowski space-time in a theory of N
charged scalar fields to lowest order in the gauge coupling and to leading
order in the large N within two scenarios of cosmological relevance. The
long-wavelength power spectrum for electric and magnetic fields at the end of
the phase transition is obtained explicitly.
  It follows that equipartition between electric and magnetic fields does not
hold out of equilibrium. In the case of a transition from a high temperature
phase, the conductivity of the medium severely hinders the generation of
magnetic fields, however the magnetic fields generated are correlated on scales
of the order of the domain size, which is much larger than the magnetic
diffusion length. Implications of the results to cosmological phase transitions
driven by spinodal unstabilities are discussed.


title: Supersymmetric Dark Matter

abstract:
  After a short introduction on some general implications of recent
cosmological observations, we discuss the properties of relic neutralinos in
connection with present experimental strategies for detecting WIMPs.


title:
The spontaneous generation of magnetic fields at high temperature in a
  supersymmetric theory

abstract:
  The spontaneous generation of magnetic and chromomagnetic fields at high
temperature in the minimal supersymmetric standard model (MSSM) is
investigated. The consistent effective potential including the one-loop and the
daisy diagrams of all bosons and fermions is calculated and the magnetization
of the vacuum is observed. The mixing of the generated fields due to the quark
and s-quark loop diagrams and the role of superpartners are studied in detail.
It is found that the contribution of these diagrams increases the magnetic and
chromomagnetic field strengths as compared with the case of a separate
generation of fields. The magnetized vacuum state is found to be stable due to
the magnetic masses of gauge fields included in the daisy diagrams.
Applications of the results obtained are discussed. A comparison with the
standard model case is done.


title: Double deeply virtual Compton scattering off the nucleon

abstract:
  We study the double deeply virtual Compton scattering (DDVCS) process off the
nucleon, through the scattering of a spacelike virtual photon with large
virtuality resulting in the production of a timelike virtual photon, decaying
into an e^+ e^- pair. This process is expressed in the Bjorken regime in terms
of generalized parton distributions (GPDs) and it is shown that by varying the
invariant mass of the lepton pair, one can directly extract the GPDs from the
observables. We give predictions for the DDVCS cross section and beam helicity
asymmetry and discuss its experimental feasibility.


title: Supergravity Inflation Free from Harmful Relics

abstract:
  We present a realistic supergravity inflation model which is free from the
overproduction of potentially dangerous relics in cosmology, namely moduli and
gravitinos which can lead to the inconsistencies with the predictions of baryon
asymmetry and nucleosynthesis. The radiative correction turns out to play a
crucial role in our analysis which raises the mass of supersymmetry breaking
field to intermediate scale. We pay a particular attention to the non-thermal
production of gravitinos using the non-minimal Kahler potential we obtained
from loop correction. This non-thermal gravitino production however is
diminished because of the relatively small scale of inflaton mass and small
amplitudes of hidden sector fields.


title: Radiative Neutralino Decay in Supersymmetric Models

abstract:
  The radiative decay Z2-> Z1 gamma proceeds at the one-loop level in the MSSM.
It can be the dominant decay mode for the second lightest neutralino Z2 in
certain regions of parameter space of supersymmetric models, where either a
dynamical and/or kinematic enhancement of the branching fraction occurs. We
perform an updated numerical study of this decay mode in both the minimal
supergravity model (mSUGRA) and in the more general MSSM framework. In mSUGRA,
the largest rates are found in the ``focus point'' region, where the mu
parameter becomes small, and the lightest neutralinos become higgsino-like; in
this case, radiative branching fraction can reach the 1% level. Our MSSM
analysis includes a scan over independent positive and negative gaugino masses.
We show branching fractions can reach the 10-100% level even for large values
of the parameter tan(beta). These regions of parameter space are realized in
supergravity models with non-universal gaugino masses. Measurement of the
radiative neutralino branching fraction may help pin down underlying parameters
of the fundamental supersymmetric model.


title: QCD in Nuclear Collisions

abstract:
  The relationship between RHIC and HERA data is explored using the idea of
saturation (color glass condensate) as a unifying framework for interpretation.
A description of the early stages of a heavy ion collision is given with the
RHIC results. The relevant QCD dynamics at the various stages of a heavy ion
collision, from production of gluons to equilibration, is reviewed. Some
comments on current phenomenology are given.


title:
Renormalization-Mass Scale Dependence in QCD Contributions to
  Semileptonic $b \to u$ Decay

abstract:
  QCD contributions to the $b \to u \ell^- \bar{\nu}_\ell$ decay rate, which
are known to two-loop order in the $\bar{MS}$ scheme, exhibit sufficient
dependence on the renormalization mass $\mu$ to compromise phenomenological
predictions for inclusive semileptonic $B \to X_u$ processes. Such scale
dependence is ameliorated by the renormalization-group (RG) extraction and
summation of all leading and RG-accessible subleading logarithms occurring
subsequent to two-loop order in the perturbative series. This optimal
RG-improvement of the known portion of the perturbative series virtually
eliminates $\mu$-dependence as a source of theoretical uncertainty in the
predicted semileptonic $B \to X_u$ inclusive rate.


title:
Determination of weak phases $\phi_2$ and $\phi_3$ from $B\to
  \pi\pi,K\pi$ in the pQCD method

abstract:
  We look at two methods to determine the weak phases $\phi_2$ and $\phi_3$
from $B \to \pi\pi$ and $K\pi$ decays within the perturbative QCD approach. We
obtain quite interesting bounds on $\phi_2$ and $\phi_3$ from recent
experimental measurements in asymmetric B-factory: $55^o \leq \phi_2 \leq
100^o$ and $51^o \leq \phi_3 \leq 129^o$. Specially we predict the possibility
of large direct CP violation effect in $B^0 \to \pi^{+}\pi^{-}$ decay with
$A_{cp}^{dir}(B\to \pi^{+} \pi^{-})=(23\pm7)$ %.


title: Preserving the Lepton Asymmetry in the Brane World

abstract:
  In models where the Standard Model spectrum is localized on a brane embedded
in a higher dimensional spacetime, we discuss the lepton number violation
induced by the emission of right-handed neutrinos from the brane. We show that
quite generically the presence of the right-handed neutrinos in the bulk leads
to rapid lepton number violating processes which above the electroweak scale
would wash away any prior lepton or baryon asymmetry. In order to preserve the
lepton asymmetry, the brane-bulk couplings for at least one lepton flavor must
be extremely suppressed. We show that this has a natural interpretation in the
brane world.


title: Precocious Gauge Symmetry Breaking in $SU(6) \times SU(2)_R$ Model

abstract:
  In the $SU(6) \times SU(2)_R$ string-inspired model, we evolve the couplings
and the masses down from the string scale $M_S$ using the renormalization group
equations and minimize the effective potential. This model has the flavor
symmetry including the binary dihedral group $\tilde{D}_4$. We show that the
scalar mass squared of the gauge non-singlet matter field possibly goes
negative slightly below the string scale. As a consequence, the precocious
radiative breaking of the gauge symmetry down to the standard model gauge group
can occur. In the present model, the large Yukawa coupling which plays an
important role in the symmetry breaking is identical with the colored Higgs
coupling related to the longevity of the proton.


title:
Lepton-Flavor Violating Decay of Tau Lepton in the Supersymmetric Seesaw
  Model

abstract:
  Now the bounds on the lepton-flavor violating (LFV) decay modes of tau lepton
are being improved by the Belle experiment in the KEK B factory. In this paper
the LFV decay of tau lepton is discussed in the supersymmetric seesaw model,
using the current neutrino oscillation data.


title:
NNLL corrections to the angular distribution and to the forward-backward
  asymmetries in b -> X_s l+ l-

abstract:
  We present NNLL results for the double differential decay width dGamma(b ->
X_s l+ l-)/(dsh dcos(theta)), where theta is the angle between the momenta of
the b-quark and the l+, measured in the rest-frame of the lepton pair. From
these results we also derive NNLL results for the lepton forward-backward
asymmetries. Genuinely new calculations for the combined virtual- and gluon
bremsstrahlung corrections associated with the operators O_7, O_9 and O_10 are
necessary. We find that the NNLL corrections drastically reduce the
renormalization scale dependence of the forward-backward asymmetries. In
particular, sh_0, the position at which the forward-backward asymmetries
vanish, is essentially free of uncertainties due to the renormalization scale
at NNLL precision. We find sh_0(NNLL)=0.162 +/- 0.005, where the error is
dominated by the uncertainty in (m_c/m_b). This is to be compared with
sh_0(NLL)=0.144 +/- 0.020, where the error is dominated by uncertainties due to
the choice of mu.


title: Measuring the initial electron beam polarizarion in e gamma collisions

abstract:
  The investigation of $e \gamma \to \nu W$ process is crucial for a possible
high energy $e \gamma$ or $\gamma \gamma$ collider since it offers the
possibility for both new physics discovery and precision measurements. The
polarization of the initial beam is a limiting factor for the systematic errors
in both cases. This note addresses the feasibility of making a measurement of
the initial electron beam polarization with relative statistical error of one
percent. Generator and detector level MC tools are used to obtain a realistic
event selection for the signal process at the future CLIC test facility running
at $ \sqrt{s}=150$ GeV.


title: Lifetimes of heavy hadrons beyond leading logarithms

abstract:
  The lifetime splitting between the B^+ and B_d^0 mesons has recently been
calculated in the next-to-leading order of QCD. These corrections are necessary
for a reliable theoretical prediction, in particular for the meaningful use of
hadronic matrix elements computed with lattice QCD. Using results from quenched
lattice QCD we find tau(B^+)/tau(B^0_d)=1.053 +/- 0.016 +/- 0.017, where the
uncertainties from unquenching and 1/m_b corrections are not included. The
lifetime difference of heavy baryons Xi_b^0 and \Xi_b^- is also discussed.


title: Decoupling and lepton flavor violation in extra dimension

abstract:
  We discuss the fermion mass hierarchy and the flavor mixings in the fat brane
scenario of five dimensional SUSY theory. The decoupling solution of the
sfermion mass spectrum can be realized by introducing the vector-like mirror
fields in an extra dimension. In this scenario, both the left- and right-handed
sleptons can have sizable flavor mixings. We point out that this sizable flavor
mixings can induce the suitable magnitude of the muon anomalous magnetic moment
($g_\mu -2$) within the experimental bounds of lepton flavor violating
processes.


title:
Two-Loop Bosonic Electroweak Corrections to the Muon Lifetime and
  M_Z-M_W Interdependence

abstract:
  The two-loop electroweak bosonic correction to the muon lifetime and the
M_W-M_Z interdependece is computed using analytical methods of asymptotic
expansion. Combined with previous calculations this copmletes the full two-loop
correction to $\Delta r$ in the Standard Model. The shift to the prediction of
W-boson mass due to two-loop bosonic corrections does not exceed 1 MeV for the
range of the Higgs mass from 100 to 1000 GeV.


title:
Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral
  quark soliton model (I) -- phenomenological predictions --

abstract:
  Theoretical predictions are given for the light-flavor sea-quark
distributions including the strange quark ones on the basis of the flavor SU(3)
version of the chiral quark soliton model. Careful account is taken here of the
SU(3) symmetry breaking effects due to the mass difference between the strange
and nonstrange quarks. This effective mass difference $\Delta m_s$ between the
strange and nonstrange quarks is the only one parameter necessary for the
flavor SU(3) generalization of the model. A particular emphasis of study is put
on the {\it light-flavor sea-quark asymmetry} as exemplified by the observables
$\bar{d} (x) - \bar{u} (x), \bar{d} (x) / \bar{u} (x), \Delta \bar{u} (x) -
\Delta \bar{d} (x)$ as well as on the {\it particle-antiparticle asymmetry} of
the strange quark distributions represented by $s (x) - \bar{s} (x), s (x) /
\bar{s} (x), \Delta s (x) - \Delta \bar{s} (x)$ etc. As for the unpolarized
sea-quark distributions, the predictions of the model seem qualitatively
consistent with the available phenomenological information provided by the NMC
data for $\bar{d} (x) - \bar{u} (x)$, the E866 data for $\bar{d} (x) / \bar{u}
(x)$, the CCFR data and Barone et al.'s fit for $s (x) / \bar{s} (x)$ etc. The
model is shown to give several unique predictions also for the spin-dependent
sea-quark distribution, such that $\Delta s (x) \ll \Delta \bar{s}(x) \lesssim
0$ and $\Delta \bar{d}(x) < 0 < \Delta \bar{u}(x)$, although the verification
of these predictions must await more elaborate experimental investigations in
the near future.


title:
Microscopic modelling of defects production and their annealing after
  irradiation in silicon for HEP particle detectors

abstract:
  In this contribution, the production of defects in radiation fields and their
evolution toward equilibrium in silicon for detector uses has been modelled. In
the quantitative model developed, the generation rate of primary defects is
calculated starting from the projectile - silicon interaction and from recoil
energy redistribution in the lattice. Vacancy-interstitial annihilation,
interstitial migration to sinks, divacancy and vacancy-impurity complex (VP,
VO, V2O, CiOi and CiCs) formation are considered. The results of the model
support the experimental available data. The correlation between the initial
material parameters, temperature, irradiation and annealing history is
established. The model predictions could be a useful clue in obtaining harder
materials for detectors at the new generation of accelerators or for space
missions.


title:
Z-scaling, high-pT direct photon and pi0-meson production at RHIC and
  LHC

abstract:
  The scaling properties of direct photon production in pp, barpp and pA
collisions at high energies is reviewed. The experimental data on the cross
sections obtained at ISR, SpS and Tevatron are used in the analysis. The
properties of data z-presentation, the energy and angular independencies, the
power law, and A-dependence are discussed. The use of z-scaling to search for
new physics phenomena in hadron-hadron, hadron-nucleus and nucleus-nucleus
collisions is suggested. The violation of z-scaling characterized by the change
of the fractal dimension is considered as a new and complimentary signature of
a nuclear phase transition. The cross sections of direct photon, pi0- and
eta0-meson production in pp and pPb collisions at RHIC and LHC energies are
predicted.


title: Possible Large Direct CP Violations in Charmless B-Decays

abstract:
  We discuss the perturbative QCD approach for the exclusive two body B-meson
decays to light mesons. We briefly review its ingredients and some important
theoretical issues on factorization approach. We show numerical results which
are compatible with present experimantal data for the charmless B-meson decays.
Specailly we predict the possibility of large direct CP violation effects in
$B^0 \to \pi^{+}\pi^{-}$ $(23\pm7 %)$ and $B^0\to K^{+}\pi^{-}$ $(-17\pm5%)$.
In the last section we investigate two methods to determine the weak phases
$\phi_2$ and $\phi_3$ from $B \to \pi\pi,K\pi$ processes. We obtain bounds on
$\phi_2$ and $\phi_3$ from present experimental measurements.


title: Instantons 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. Dependence of characteristic instanton size on
gluon condensate and correlation length in nonperturbative vacuum is found.
Comparison of obtained instanton size distribution with lattice data is made.


title: The QCD Effective Charge to All Orders

abstract:
  Using the pinch technique, we show how to construct the QCD effective charge
to all orders.


title: Unitarity Quadrangles of Four Neutrino Mixing

abstract:
  We present a classification of the unitarity quadrangles in the four-neutrino
mixing scheme. We find that there are totally thirty-six distinct topologies
among twelve different unitarity quadrangles. Concise relations are established
between the areas of those unitarity quadrangles and the rephasing invariants
of CP and $T$ violation.


title: Neutrino masses and particle physics beyond the standard model

abstract:
  The evidence for non-vanishing neutrino masses from solar and atmospheric
neutrinos provides the first solid hint towards physics beyond the standard
model. A full reconstruction of the neutrino spectrum may well provide a key to
the theoretical structures underlying the standard model such as supersymmetry,
grand unification or extra space dimensions. In this article we discuss the
impact of absolute neutrinos masses on physics beyond the standard model. We
review the information obtained from neutrino oscillation data and discuss the
prospects of the crucial determination of the absolute neutrino mass scale, as
well as the intriguing connection with the Z-burst model for extreme-energy
cosmic rays.


title: Heavy quark production via leptoquarks at a neutrino factory

abstract:
  The proposed neutrino factory (NF) based on a muon storage ring (MSR) is an
ideal place to look for heavy quark production via neutral current (NC) and
charged current (CC) interactions. In this article, we address the issue of
contribution coming from mediating leptoquarks (LQ) in $\nu_\mu
(\bar\nu_e)-{\rm N}$ interactions leading to the production of $b(\bar b)$ at a
MSR and investigate the region where LQ interactions are significant in the
near-site experiments.


title: CP violation in neutrino oscillation and leptogenesis

abstract:
  We study the correlation between CP violation in neutrino oscillations and
leptogenesis in the framework with two heavy Majorana neutrinos and three light
neutrinos. Among three unremovable CP phases, a heavy Majorana phase
contributes to leptogenesis. We show how the heavy Majorana phase contributes
to Jarlskog determinant $J$ as well as neutrinoless double $\beta$ decay by
identifying a low energy CP violating phase which signals the CP violating
phase for leptogenesis. For some specific cases of the Dirac mass term of
neutrinos, a direct relation between lepton number asymmetry and $J$ is
obtained. For the most general case of the framework, we study the effect on $
J $ coming from the phases which are not related to leptogenesis, and also show
how the correlation can be lost in the presence of those phases.


title: B Physics and Extra Dimensions

abstract:
  We compute the dominant new physics contributions to the processes Z -> b b
and B - B in the context of two representative models with extra dimensions.
The main thrust of the calculations focuses on how to control the effects of
the infinite tower of Kaluza-Klein modes inside the relevant one-loop diagrams.
By comparing the results with the existing experimental data, most importantly
those for Rb, we show that one may derive interesting lower bounds on the size
of the compactification scale Mc.


title: Charm and bottom quark masses from QCD moment sum rules

abstract:
  In this work the charm and bottom quark masses are determined from QCD moment
sum rules for the charmonium and upsilon systems. In our analysis we include
both the results from non-relativistic QCD and perturbation theory at
next-next-to-leading order. For the pole masses we obtain $M_c=1.75\pm 0.15$
GeV and $M_b=4.98\pm 0.125$ GeV. Using the potential-subtracted mass in
intermediate steps of the calculation the MS-masses are determined to $m_c(m_c)
= 1.19 \pm 0.11$ GeV and $m_b(m_b) = 4.24 \pm 0.10$ GeV.


title: CP--Violating Invariants in Supersymmetry

abstract:
  I study the weak basis CP-violating invariants in supersymmetric models, in
particular those which cannot be expressed in terms of the Jarlskog--type
invariants, and find basis--independent conditions for CP conservation. With an
example of the K-anti-K mixing, I clarify what are the combinations of
supersymmetric parameters which are constrained by experiment.


title:
Next-to-next-to-leading order fits to CCFR'97 $xF_3$ data and infrared
  renormalons

abstract:
  We briefly summarize the outcomes of our recent improved fits to the
experimental data of CCFR collaboration for $xF_3$ structure function of $\nu
N$ deep-inelastic scattering at the next-to-next-to-leading order. Special
attention is paid to the extraction of $\alpha_s(M_Z)$ and the parameter of the
infrared renormalon model for $1/Q^2$-correction at different orders of
perturbation theory. The results can be of interest for planning similar
studies using possible future data of Neutrino Factories.


title:
Determining the BDMPS transport coefficient via medium-modified
  fragmentation functions

abstract:
  In nucleus-nucleus collisions at RHIC and LHC, partons produced at high
transverse momentum can undergo multiple scattering within the collision region
prior to fragmenting into hadrons. We have studied the resulting
medium-modified fragmentation function based on a calculation of the BDMPS-Z
medium-induced gluon radiation for a dense, expanding medium of small finite
extension. Here we explain how the BDMPS transport coefficient which measures
the energy density attained in the collision, can be extracted from the
observed modification of high-pt hadroproduction. We also comment on the
significant remaining uncertainties in extracting the transport coefficient
from data.


title: Nonequilibrium quantum fields with large fluctuations

abstract:
  We consider the nonequilibrium evolution of an O(N)-symmetric scalar quantum
field theory using a systematic two-particle irreducible 1/N-expansion to
next-to-leading order, which includes scattering and memory effects. The
corresponding ``full Kadanoff-Baym equations'' are solved numerically without
further approximations. This allows one to obtain a controlled nonperturbative
description of far-from-equilibrium dynamics and the late-time approach to
quantum thermal equilibrium. Employing in addition a first-order gradient
expansion for the Wigner transformed correlators we derive kinetic equations.
In contrast to standard descriptions based on loop expansions, our equations
remain valid for nonperturbatively large fluctuations. As an application, we
discuss the fluctuation dominated regime following parametric resonance in
quantum field theory.


title:
Diffractive effects in spin-flip pp amplitudes and predictions for
  relativistic energies

abstract:
  We analyze the diffractive (Pomeron) contribution to pp spin-flip amplitude
and discuss the possible scenarios for energies available at the Relativistic
Heavy-Ion Collider (RHIC). In particular, we show that RHIC data will be
instrumental in assessing the real contribution of diffraction to spin
amplitudes.


title:
Hadron correlators, spectral functions and thermal dilepton rates from
  lattice QCD

abstract:
  We discuss information on thermal modifications of hadron properties which
can be extracted from the structure of Euclidean correlation functions of
hadronic currents as well as more direct information obtained through the
reconstruction of the spectral functions based on the Maximum Entropy Method.


title: Unintegrated gluon in the photon and heavy quark production

abstract:
  The unintegrated gluon density in the photon is determined, using the
Kimber-Martin-Ryskin prescription . In addition, a model of the unintegrated
gluon is proposed, based on the saturation model extended to the large-x
region. These gluon densities are applied to obtain cross sections for charm
and bottom production in gamma-p and gamma-gamma collisions using the k_t
factorization approach. We investigate both direct and resolved photon
contributions and make comparison with the results from the collinear approach
and the experimental data. An enhancement of the cross section due to inclusion
of non-zero transverse momenta of the gluons is found. The charm production
cross section is consistent with the data. The data exceed our conservative
estimate for bottom production in gamma-p collisions, but theoretical
uncertainties are too large to claim a significant inconsistency. A substantial
discrepancy between theory and the experiment is found for gamma gamma -> b
bbar X, not being cured by the k_t factorization approach.


title: A study of top polarization in single-top production at the LHC

abstract:
  This paper complements the study of single top production at the LHC aiming
to estimate the sensitivity of different observables to the magnitude of the
effective couplings. In a previous paper the dominant $W$-gluon fusion
mechanism was considered, while here we extend the analysis to the subdominant
(10% with our set of experimental cuts) s-channel process. In order to
distinguish left from right effective couplings it is required to consider
polarized cross-sections and/or include $m_b$ effects. The spin of the top is
accessible only indirectly by measuring the angular distribution of its decay
products. We show that the presence of effective right-handed couplings implies
necessarily that the top is not in a pure spin state. We discuss to what extent
quantum interference terms can be neglected in the measurement and therefore
simply multiply production and decay probabilities clasically. The coarsening
involved in the measurement process makes this possible. We determine for each
process the optimal spin basis where theoretical errors are minimized and,
finally, discuss the sensitivity in the s-channel to the effective right-handed
coupling. The results presented here are all analytical and include $m_b$
corrections. They are derived within the narrow width approximation for the
top.


title: An Instanton Picture O.P.E. <A^2> Condensate?

abstract:
  Gluon two- and three-point Green Functions computed in Landau gauge from the
lattice show the existence of power corrections to the purely perturbative
expressions, that can be explained through an Operator Product Expansion as the
influence of a non gauge invariant mass dimension two condensate. The
relationship of this condensate with topological properties of QCD, namely
instantons, will be studied, giving a first estimate of the contribution of
instantons to this condensate based in the direct lattice measure, after a
cooling process, of the instanton liquid properties.


title: Remarks on Semileptonic B and D Decays into Orbitally Excited Mesons

abstract:
  We have obtained the differential decay rate and calculated the branching
ratios of the exclusive semileptonic decays $B(D) \to Xl\nu$, where $X$ is a
p-wave meson, using the nonrelativistic ISGW quark model. Our results are
compared with the predictions of the ISGW2 model. We have computed some
branching ratios that were not reported or were reported with 0.00 in this
model. For example, we find that $Br(B_c^- \to \bar{B_{s2}^{*0}}l^-\bar{\nu}) =
4.03 \times 10^{-5}$, $Br(B_c^- \to \bar{B_2^{*0}}l^- \bar{\nu}) =3.65 \times
10^{-6}$ and $Br(D_s^+ \to f_2l^+\nu) = 2.7 \times 10^{-5}$, which seems to be
at the reach of forthcoming experiments. Furthermore, we have classified the
$B_{u,d,s} \to Tl\nu$ decays in two groups and compared the semileptonic and
nonleptonic decays including a tensor meson in the final state.


title: Diquark interaction and gaps for color superconductivity

abstract:
  Using flow equations, we derive an effective quark-quark interaction and
obtain the coupled set of gap equations for the condensates of the CFL phase of
massless $N_f=3$ dense QCD. The formalism developed here enables one to
consider more general case of nonzero $s$-quark mass.


title: Scattering Through QCD Sphalerons

abstract:
  Diffractive parton-parton scattering in the soft pomeron regime can be
explained by the production of a QCD sphaleron. Sphaleron production results
into the emission of $3+2N_F$ gluons and quarks. At RHIC we expect many
sphalerons to be released thereby affecting most prompt processes.


title: Three-Neutrino Mass Matrices with Two Texture Zeros

abstract:
  Out of the fifteen 3 x 3 neutrino mass matrices with two texture zeros seven
are compatible with the neutrino oscillation data. While 2 of them correspond
to hierarchical neutrino masses and 1 to an inverted hierarchy, the remaining 4
correspond to degenerate masses. Moreover only the first 3 of the 7 mass
matrices are compatible with the maximal mixing angle of atmospheric neutrino
and hence favoured by data. We give compact expressions for mass matrices in
terms of mass eigenvalues and study phenomenological implications for the 7
cases. Similarity of the textures of the neutrino, charged-lepton mass matrices
with those of quark mass matrices is also discussed.


title:
Stable, Time-Dependent, Exact Solutions for Brane Models with a Bulk
  Scalar Field

abstract:
  We derive two classes of brane-world solutions arising in the presence of a
bulk scalar field. For static field configurations, we adopt a time-dependent,
factorizable metric ansatz that allows for radion stabilization. The solutions
are characterized by a non-trivial warping along the extra dimension, even in
the case of a vanishing bulk cosmological constant, and lead to a variety of
inflationary, time-dependent solutions of the 3D scale factor on the brane. We
also derive the constraints necessary for the stability of these solutions
under time-dependent perturbations of the radion field, and we demonstrate the
existence of phenomenologically interesting, stable solutions with a positive
cosmological constant on the brane.


title:
A statistical mechanics framework for multi-particle production in high
  energy reactions

abstract:
  We deduce the particle distributions in particle collisions with
multihadron-production in the framework of mechanical statistics. They are
derived as functions of x, P_T^2 and the rest mass of different species for a
fixed total number of all produced particles, inelasticity and total transverse
energy. For P_T larger than the mass of each particle we get the behaviour
\frac{dn_i}{dP_T} \sim \sqrt{P_T} e^{-\frac{P_T}{T_H}} Values of <P_T>_\pi,
<P_T>_K, and <P_T>_{\bar{p}} in agreement with experiment are found by taking
T_H=180MeV (the Hagedorn temperature).


title: Jet Quenching

abstract: A short summary of the physics underlying jet quenching is given


title:
Dual coherent particle emission as generalised Cherenkov-like effect in
  high energy particle collisions

abstract:
  In this paper we introduce a new kind of nuclear/hadronic coherent particle
production mechanism in high-energy collisions called \emph{dual coherent
particle emission (DCPE)} which takes place when the phase velocities of the
emitted particle v_{Mph} and that of particle source v_{B_1ph} satisfy the dual
coherence condition: v_{Mph} <= v_{B_1ph}^-1. The general signatures of the
DCPE in the nuclear and hadronic media are established and some experimental
evidences are given.


title: Questions and Remarks About Clans in Multiparticle Dynamics

abstract:
  The fact that several important effects in multiparticle dynamics, on which
QCD has not yet satisfactory predictions, have been interpreted in terms of the
validity of negative binomial (Pascal) regularity and related clan properties
at the level of simpler substructures, raises intriguing questions on clan
properties in all classes of collisions, the main one being whether clans are
observable objects or merely a mathematical concept. We approach this problem
by studying clan masses and rapidity distributions in each substructure for
e+e- annihilation and hh collisions, and find that such properties can indeed
characterise the different components. These results support the idea that
clans could be observable, a challenging problem for future experiments.


title:
Integral equation for spin dependent unintegrated parton distributions
  incorporating double ln^2(1/x) effects at low x

abstract:
  In this paper we derive an integral equation for the evolution of
unintegrated (longitudinally) polarized quark and gluon parton distributions.
The conventional CCFM framework is extended at small x in order to incorporate
the QCD expectations concerning the double ln^2(1/x) resummation at low x for
the integrated distributions. Complete Altarelli-Parisi splitting functions are
included, that makes the formalism compatible with the LO Altarelli-Parisi
evolution at large and moderately small values of x. The obtained modified
polarized CCFM equation is shown to be partially diagonalized by the
Fourier-Bessel transform. Results of the numerical solution for this modified
CCFM equation for the non-singlet quark distributions are presented.


title: Distribution of the largest eigenvalues of the Levi - Smirnov ensemble

abstract:
  We calculate the distribution of the k-th largest eigenvalue in the random
matrix Levi-Smirnov (LSE) ensemble, using the spectral dualism between LSE and
chiral Gaussian Unitary Ensemble (GUE). Then we reconstruct universal spectral
oscillations and we investigate an asymptotic behavior of the spectral
distribution.


title: Three-body nonleptonic B decays in perturbative QCD

abstract:
  We develop perturbative QCD formalism for three-body nonleptonic $B$ meson
decays. Leading contributions are identified by defining power counting rules
for various topologies of amplitudes. The analysis is simplified into the one
for two-body decays by introducing two-meson distribution amplitudes. This
formalism predicts both nonresonant and resonant contributions, and can be
generalized to baryonic decays.


title: The doubly heavy baryons

abstract:
  We present the results for the masses of the doubly heavy baryons $\Xi_{QQ'}$
and $\Omega_{Q'Q}$ where $Q,Q'=b,c$ obtained in the framework of the simple
approximation within the nonperturbative string approach.


title:
The bound state corrections to the semileptonic decays of the heavy
  baryons

abstract:
  We present an investigation of the lepton energy distributions in the
inclusive semileptonic weak decays of heavy baryons performed within a
relativistic quark model formulated on the light front (LF). Using the
heavy-quark LF distribution functions related to the equal time momentum wave
functions taken from the Kalman--Tran--D'Souza model we compute the electron
energy spectra and the total semileptonic widths of the Lambda_Q and Xi_Q
(Q=c,b) baryons and confront the results with existing data.


title:
Minkowski solution of Dyson-Schwinger equations in momentum subtraction
  scheme

abstract:
  Using the Green function integral representation the Dyson-Schwinger
equations are solved directly in Minkowski space. Essential ideas of the
spectral techniques are discussed and applied on two renormalizable models: the
Yukawa theory with massive pseudoscalar meson and conventional spinor QED.
Within the momentum subtraction procedure, the appropriate renormalization is
performed analytically which leads to the usual dispersion formulation. The
electron propagator obtained in this frame is compared with the solution of
Euclidean Dyson-Schwinger equation and with the perturbation theory results as
well. The proposed method has the advantage of obtaining solutions in both the
space- and {\bf{time}}-like regimes of momenta. In addition,when the coupling
constant increases we find some un-expected discrepancy between the Euclidean
and integral representation solutions. Especially, when the solutions of the
original momentum DSE's exhibit the signal for confinement then the spectral
approach gives no solution for Lehmann function of confined particle.


title: Standard and non-standard neutrino properties

abstract:
  I review the interpretation of solar and atmospheric neutrino data in terms
neutrino oscillations and describe some ways to account for the required
neutrino masses and mixing angles from first principles, both within top-down
and bottom-up approaches. I also discuss non-oscillation phenomena such as
nu-less double beta which may probe the absolute scale of neutrino mass, and
also reveal its Majorana nature. I note that leptonic CP violation induced by
``Majorana'' phases drop from oscillations but play a role in the leptogenesis
scenario for the baryon asymmetry of the Universe. Direct tests of leptonic CP
violation in oscillation experiments, such as neutrino factories, will be a
tough challenge, due to the hierarchical neutrino mass splittings and the
smallness of theta13 indicated by reactors. The large solar mixing angle
theta12 offers a way to probe otherwise inaccessible features of supernova
physics. Finally, I note that in low-scale models of neutrino mass, one may
probe all mixing angles, including the atmospheric theta23, at high energy
accelerator experiments such as the LHC or NLC. A neat example is supersymmetry
with bilinear breaking of R parity, where the LSP decay branching ratios are
directly correlated to the neutrino mixing angles. I also discuss
non-oscillation solutions to the solar neutrino problem in terms of spin-flavor
precession and non-standard neutrino interactions, which will be crucially
tested at KamLAND.


title: Ward identity and electrical conductivity in hot QED

abstract:
  We study the Ward identity for the effective photon-electron vertex summing
the ladder diagrams contributing to the electrical conductivity in hot QED at
leading logarithmic order. It is shown that the Ward identity requires the
inclusion of a new diagram in the integral equation for the vertex that has not
been considered before. The real part of this diagram is subleading and
therefore the final expressions for the electrical conductivity at leading
logarithmic order are not affected.


title: CP-violation and mixing in charmed mesons

abstract:
  The Standard Model contribution to D0-anti-D0 mixing is dominated by the
contributions of light s and d quarks. Neglecting the tiny effects due to b
quark, both mass and lifetime differences vanish in the limit of SU(3)_F
symmetry. Thus, the main challenge in the Standard Model calculation of the
mass and width difference in the D0-anti-D0 system is to estimate the size of
SU(3) breaking effects. We prove that D meson mixing occurs in the Standard
Model only at second order in SU(3) violation. We consider the possibility that
phase space effects may be the dominant source of SU(3) breaking. We find that
y=(\Delta \Gamma)/(2\Gamma) of the order of one percent is natural in the
Standard Model, potentially reducing the sensitivity to new physics of
measurements of D meson mixing. We also discuss the possibility of observing
lifetime differences and CP violation in charmed mesons both at the currently
operating and proposed facilities.


title: On the Possibility of Optical Unification in Heterotic Strings

abstract:
  Recently J. Giedt discussed a mechanism, entitled optical unification,
whereby string scale unification is facilitated via exotic matter with
intermediate scale mass. This mechanism guarantees that a virtual MSSM
unification below the string scale is extrapolated from the running of gauge
couplings upward from M_Z^o when an intermediate scale desert is assumed. In
this letter we explore the possibility of optical unification within the
context of weakly coupled heterotic strings. In particular, we investigate this
for models of free fermionic construction containing the NAHE set of basis
vectors. This class is of particular interest for optical unification, because
it provides a standard hypercharge embedding within SO(10), giving the standard
k_Y = 5/3 hypercharge level, which was shown necessary for optical unification.
We present a NAHE model for which the set of exotic SU(3)_C
triplet/anti-triplet pairs, SU(2)_L doublets, and non-Abelian singlets with
hypercharge offers the possibility of optical unification. Whether this model
can realize optical unification is conditional upon these exotics not receiving
Fayet-Iliopoulos (FI) scale masses when a flat direction of scalar vacuum
expectation values is non-perturbatively chosen to cancel the FI D-term, xi,
generated by the anomalous U(1)-breaking Green-Schwarz-Dine-Seiberg-Wittten
mechanism. A study of perturbative flat directions and their phenomenological
implications for this model is underway.
  This paper is a product of the NFS Research Experiences for Undergraduates
and the NSF High School Summer Science Research programs at Baylor University.


title:
Quantum dynamics of phase transitions in broken symmetry $\lambda
  \phi^4$ field theory

abstract:
  We perform a detailed numerical investigation of the dynamics of broken
symmetry $\lambda \phi^4$ field theory in 1+1 dimensions using a
Schwinger-Dyson equation truncation scheme based on ignoring vertex
corrections. In an earlier paper, we called this the bare vertex approximation
(BVA). We assume the initial state is described by a Gaussian density matrix
peaked around some non-zero value of $<\phi(0)>$, and characterized by a single
particle Bose-Einstein distribution function at a given temperature. We compute
the evolution of the system using three different approximations: Hartree, BVA
and a related 2PI-1/N expansion, as a function of coupling strength and initial
temperature. In the Hartree approximation, the static phase diagram shows that
there is a first order phase transition for this system. As we change the
initial starting temperature of the system, we find that the BVA relaxes to a
new final temperature and exhibits a second order phase transition. We find
that the average fields thermalize for arbitrary initial conditions in the BVA,
unlike the behavior exhibited by the Hartree approximation, and we illustrate
how $<\phi(t)>$ and $<\chi(t)>$ depend on the initial temperature and on the
coupling constant. We find that the 2PI-1/N expansion gives dramatically
different results for $<\phi(t)>$.


title:
Comment on ``Radiative corrections and parity nonconservation in heavy
  atoms''

abstract:
  Very brief summary of the most recent developments in an area of QED
corrections to the parity nonconservation in atoms is presented. Main
conclusion - experimental results of Wood et al do not contradict the standard
model


title: Inverse beta-decay of arbitrarily polarized neutrons in a magnetic field

abstract:
  We calculate the cross section of the inverse beta decay process, $\nu_e+n\to
p+e$, in a background magnetic field which is much smaller than $m_p^2/e$.
Using exact solutions of the Dirac equation in a constant magnetic field, we
find the cross section for arbitrary polarization of the initial neutrons. The
cross section depends on the direction of the incident neutrino even when the
initial neutron is assumed to be at rest and has no net polarization. Possible
implications of the result are discussed.


title: Gluon-Exchange in Spin-Dependent Fragmentation

abstract:
  The fragmentation of an unpolarized quark into a transversely polarized
spin-1/2 particle is studied in the framework of a simple model. Special
attention is payed to the gluon exchange which is incorporated in the gauge
link of the fragmentation function, and which we model by an abelian gauge
field. The transverse single spin asymmetries in $e^+ e^-$ annihilation and
semi-inclusive deep-inelastic scattering are calculated in the one-loop
approximation. For $e^+ e^-$ annihilation one finds a cancellation between
contributions from two on-shell intermediate states, which have no counterpart
in deep-inelastic scattering. As a consequence of this cancellation, the model
predicts the same spin asymmetry for both processes implying that, in the
one-loop approximation, the corresponding fragmentation function is universal.


title:
Fragmentation functions and their role in determining the polarized
  parton densities

abstract:
  We extract the pion fragmentation functions and their uncertainties from a
judicious choice of e+e- and semi-inclusive DIS data. These are used to study
the error propagation in the extraction of polarized parton densities from
semi-inclusive DIS asymmetries. We conclude that the uncertainties on polarized
PDs have been underestimated in the past.


title: Four-pion production

abstract:
  Starting from the low-energy structure derived from QCD, we extend the
amplitudes for four-pion production in e+ e- annihilation and tau decays up to
invariant four-pion masses of 1 GeV. Cross sections and branching ratios
BR(rho^0 -> 4 pi) are compared with available data.


title: Neutrino Radar

abstract:
  We point out that with improving our present knowledge of experimental
neutrino physics it will be possible to locate nuclear powered vehicles like
submarines, aircraft carriers and UFOs and detect nuclear testing. Since
neutrinos cannot be shielded, it will not be possible to escape these
detection. In these detectors it will also be possible to perform neutrino
oscillation experiments during any nuclear testing.


title:
Bhabha vs. Moller scattering as a contact-interaction analyzer at a
  polarized Linear Collider

abstract:
  We discuss electron-electron contact-interaction searches in the Bhabha and
Moller processes at planned Linear Colliders run in the electron-positron and
electron-electron modes, with longitudinally polarized beams. Our analysis is
based on the measurement, for the two processes, of polarized differential
cross sections that allow to disentangle the different, independent,
four-fermion couplings. We evaluate by a model-independent analysis the
sensitivities to the contact coupling constants, emphasizing the role of the
available beam polarization and the complementarity of the two processes in
giving the best limits. We also make a comparison with the potential of
$e^+e^-\to\mu^+\mu^-$ at the same energy and beams polarization.


title:
On the CP Violation Associated with Majorana Neutrinos and Neutrinoless
  Double-Beta Decay

abstract:
  Assuming 3-neutrino mixing and massive Majorana neutrinos, we analyze the
possibility of establishing the existence of CP-violation associated with
Majorana neutrinos in the lepton sector i) by measuring of the effective
Majorana mass |<m>| in neutrinoless double beta-decay with a sufficient
precision and ii) by measuring of, or obtaining a stringent upper limit on, the
lightest neutrino mass m1. Information on m1 can be obtained in the tritium
beta decay experiment KATRIN and from astrophysical and cosmological
observations. Proving that the indicated CP-violation takes place requires, in
particular, a relative experimental error on the measured value of |<m>| not
bigger than 20 %, a ``theoretical uncertainty'' in the value of |<m>| due to an
imprecise knowledge of the corresponding nuclear matrix elements smaller than a
factor of 2, a value of tan^2 theta_(solar) larger than 0.55, and values of the
relevant Majorana CP-violating phases typically within the intervals of (Pi/2 -
3 Pi/4) and (5Pi/4 - 3Pi/2).


title:
Quantum field dynamics of the slow rollover in the linear delta
  expansion

abstract:
  We show how the linear delta expansion, as applied to the slow-roll
transition in quantum mechanics, can be recast in the closed time-path
formalism. This results in simpler, explicit expressions than were obtained in
the Schr\"odinger formulation and allows for a straightforward generalization
to higher dimensions. Motivated by the success of the method in the
quantum-mechanical problem, where it has been shown to give more accurate
results for longer than existing alternatives, we apply the linear delta
expansion to four-dimensional field theory.
  At small times all methods agree. At later times, the first-order linear
delta expansion is consistently higher that Hartree-Fock, but does not show any
sign of a turnover. A turnover emerges in second-order of the method, but the
value of $<\hat{\Phi}^2(t)>$ at the turnover is larger that that given by the
Hartree-Fock approximation. Based on this calculation, and our experience in
the corresponding quantum-mechanical problem, we believe that the Hartree-Fock
approximation does indeed underestimate the value of $<\hat{\Phi}^2(t)>$ at the
turnover. In subsequent applications of the method we hope to implement the
calculation in the context of an expanding universe, following the line of
earlier calculations by Boyanovsky {\sl et al.}, who used the Hartree-Fock and
large-N methods. It seems clear, however, that the method will become
unreliable as the system enters the reheating stage.


title: Theory-Motivated Benchmark Models and Superpartners at the Tevatron

abstract:
  Recently published benchmark models have contained rather heavy
superpartners. To test the robustness of this result, several benchmark models
have been constructed based on theoretically well-motivated approaches,
particularly string-based ones. These include variations on anomaly and
gauge-mediated models, as well as gravity mediation. The resulting spectra
often have light gauginos that are produced in significant quantities at the
Tevatron collider, or will be at a 500 GeV linear collider. The signatures also
provide interesting challenges for the LHC. In addition, these models usually
account for electroweak symmetry breaking with relatively less fine-tuning than
previous benchmark models.


title:
Measuring the Spectra of High Energy Neutrinos with a Kilometer-Scale
  Neutrino Telescope

abstract:
  We investigate the potential of a future kilometer-scale neutrino telescope
such as the proposed IceCube detector in the South Pole, to measure and
disentangle the yet unknown components of the cosmic neutrino flux, the prompt
atmospheric neutrinos coming from the decay of charmed particles and the
extra-galactic neutrinos, in the 10 TeV to 1 EeV energy range.
  Assuming a power law type spectra,
  $d\phi_\nu/dE_\nu \sim \alpha E_\nu^\beta$, we quantify the discriminating
power of the IceCube detector and discuss how well we can determine magnitude
($\alpha$) as well as slope ($\beta$) of these two components of the high
energy neutrino spectrum, taking into account the background coming from the
conventional atmospheric neutrinos.


title: Bulk neutrinos and core collapse supernovae

abstract:
  We discuss the phenomenology of neutrino mixing with bulk fermions in the
context of supernova physics. The constraints on the parameter space following
from the usual energy loss argument can be relaxed by four orders of magnitude
due to a feedback mechanism that takes place in a broad region of the parameter
space. Such a mechanism also affects the protoneutron star evolution through a
non trivial interplay with neutrino diffusion. The consistency with the SN
1987A signal is discussed, as well as the implications for deleptonization,
cooling, composition of the neutrino flux and the delayed explosion scenario.


title:
Calculation of the energy levels and sizes of baryons with a noncentral
  harmonic potential

abstract:
  It is considered that the effective interaction between any two quarks in a
baryon can be approximately described by a simple harmonic potential. Also, it
is made use of the nonrelativistic approximation. The problem is firstly solved
in Cartesian coordinates in order to find the energy levels irrespective of
their angular momenta and then it is also solved in polar cilindrical
coordinates for taking into account the angular momenta of the levels. The only
parameters used in the calculation are the constituent masses of quarks. By
making a comparison between the two solutions the energies and the
corresponding angular momenta (and parity) of almost all baryon levels are
described. The agreement with the experimental data is quite impressive. The
solution in Cartesian coordinates also produces some very important figures for
the sizes of baryons and for the harmonic oscillator constant which is clearly
related to confinement.


title: Unique Graviton Exchange Signatures at Linear Colliders

abstract:
  Many types of new physics can lead to contact interaction-like modifications
in $e^+e^-$ processes below direct production threshold. We examine the
possibility of uniquely identifying the effects of graviton exchange from
amongst this large set of models by using the moments of the angular
distribution of the final state particles. In the case of $e^+e^-\to f\bar
f(W^+W^-)$ we demonstrate that this technique allows for the unique
identification of the graviton exchange signature at the $5\sigma$ level for
mass scales as high as $6(2.5)\sqrt s$.


title: Leptogenesis and CP Violation in Neutrino Oscillations

abstract:
  Assuming the seesaw and leptogenesis mechanisms, I give some general remarks
on possible connection or disconnection between CP violation in heavy Majorana
neutrino decays and that in neutrino oscillations. A simple but predictive
ansatz is proposed to simultaneously interpret the observed baryon asymmetry of
the universe and oscillations of solar and atmospheric neutrinos.


title:
Kinetic equilibration in heavy ion collisions: the role of elastic
  processes

abstract:
  We discuss the question of thermalization during the very early stages of a
high energy heavy ion collision. We review a recent study where we explicitely
showed that, contrarily to a widely used assumption, elastic collisions between
the produced partons are not sufficient to rapidly drive the system toward
local kinetic equilibrium. We then briefly discuss recent developments
concerning the description of kinetic equilibration and comment on some open
issues related to phenomenology.


title: History of Spin and Statistics

abstract:
  These lectures were given in the framework of the ``Dixi\`eme s\'eminaire
rhodanien de physique'' entitled ``Le spin en physique'', given at Villa
Gualino, Turin, March 2002. We have shown how the difficulties of
interpretation of atomic spectra led to the Pauli exclusion principle and to
the notion of spin, and then described the following steps: the Pauli spin with
2$\times$2 matrices after the birth of "new" quantum mechanics, the Dirac
equation and the magnetic moment of the electron, the spins and magnetic
moments of other particles, proton, neutron and hyperons. Finally, we show the
crucial role of statistics in the stability of the world.


title:
Search for z-scaling violation in p-p and p-A collisions at high
  energies

abstract:
  New analysis of experimental data on hadron (pi, K, barp) production in p-p
and p-D collisions at high-pT in z-presentation is performed. Data on inclusive
cross sections of cumulative particles produced in backward hemisphere in p-A
collisions are analyzed as well. The scaling function for nuclear targets (Li,
Be, C, Al, Cu and Ta) are constructed and compared with high-pT data
z-presentation. The hypothesis on z-scaling violation as a signature of new
physics phenomena is discussed.


title: $\mu_\nu$

abstract:
  The present situation and hopes on bounding (founding) neutrino magnetic
moment in future are reviewed.


title:
Scaling properties of hadron production in pi-p and pi-A collisions at
  high-pT

abstract:
  Scaling features of particles produced in pi-p and pi-A collisions over a
high-pT range at high energies are studied. The general concept of z-scaling is
applied for the analysis of pi-p and pi-A experimental data on the inclusive
cross section. The scaling function psi(z) and scaling variable z are
constructed and the anomalous dimension delta_pi is found. The A-dependence of
particle production in pion-nucleus collisions is studied. The predictions of
the inclusive cross section of the pi0-mesons produced in pi-A collisions in
the central rapidity range at high energies have been made.


title: QCD calculations of thermal photon and dilepton production

abstract:
  In this talk, I review new developments of QCD calculations of photon and
dilepton production rates in a Quark-Gluon plasma. All the rates are now known
up to $O(\alpha_s)$ both for photons and dileptons, thanks to the resummation
of multiple scatterings. For dileptons, a direct numerical calculation on the
lattice attempted recently will also be discussed.


title: Non-Standard Time Reversal and Transverse Single-Spin Asymmetries

abstract:
  A system of quarks interacting with chiral fields is shown to provide a
physical realization of a "non-standard" time reversal for particle multiplets
which mixes the multiplet components. We argue that, if the internal structure
of the nucleon is governed by a chiral dynamics, the so-called T-odd quark
distribution functions are not forbidden by time-reversal invariance and hence
might be non vanishing. This agrees with some other recent results. From a
phenomenological point of view, this would give rise to single-spin asymmetries
in inclusive processes involving a transversely polarized nucleon: in
particular, in pion lepto- and hadro-production and in Drell-Yan processes.


title:
Towards a new global QCD analysis: low x DIS data from non-linear
  evolution

abstract:
  A new approach to global QCD analysis is developed. The main ingredients are
two QCD-based evolution equations. The first one is the Balitsky-Kovchegov
nonlinear equation, which sums higher twists while preserving unitarity. The
second equation is linear and it is responsible for the correct short distance
behavior of the theory, namely it includes the DGLAP kernel. Our approach
allows extrapolation of the parton distributions to very high energies
available at the LHC as well as very low photon virtualities, $Q^2\ll 1 {\rm
GeV^2}$.
  All existing low $x$ data on the $F_2$ structure function is reproduced using
one fitting parameter. The resulting $\chi^2/df=1$.
  Analyzing the parameter $\lambda\equiv \partial\ln F_2/\partial(\ln 1/x)$ at
very low $x$ and $Q^2$ well below $1 {\rm GeV^2}$ we find $\lambda \simeq 0.08
- 0.1$. A result which agrees with the "soft pomeron" intercept without
involving soft physics.


title:
Pade/renormalization-group improvement of inclusive semileptonic B decay
  rates

abstract:
  Renormalization Group (RG) and optimized Pade-approximant methods are used to
estimate the three-loop perturbative contributions to the inclusive
semileptonic b \to u and b \to c decay rates. It is noted that the \bar{MS}
scheme works favorably in the b \to u case whereas the pole mass scheme shows
better convergence in the b \to c case. Upon the inclusion of the estimated
three-loop contribution, we find the full perturbative decay rate to be
192\pi^3\Gamma(b\to u\bar\nu_\ell\ell^-)/(G_F^2| V_{ub}|^2) = 2065 \pm 290{\rm
GeV^5} and 192\pi^3\Gamma(b\to c\ell^-\bar\nu_\ell)/(G_F^2|V_{cb}|^2)= 992 \pm
198 {\rm GeV^5}, respectively. The errors are inclusive of theoretical
uncertainties and non-perturbative effects. Ultimately, these perturbative
contributions reduce the theoretical uncertainty in the extraction of the CKM
matrix elements |V_{ub}| and |V_{cb}| from their respective measured inclusive
semileptonic branching ratio(s).


title: Effects of Radion Mixing on the Standard Model Higgs Boson

abstract:
  We discuss how mixing between the Standard Model Higgs boson and the radion
of the Randall-Sundrum model can lead to significant shifts in the expected
properties of the Higgs boson. In particular we show that the total and partial
decay widths of the Higgs, as well as the $h\to gg$ branching fraction, can be
substantially altered from their SM expectations, while the remaining branching
fractions are modified less than about 5% for most of the parameter space
volume. Precision measurements of Higgs boson properties at at a Linear
Collider are shown to probe a large region of the Randall-Sundrum model
parameter space.


title: Supersymmetric Noncommutative QED and Lorentz Violation

abstract:
  We consider Lorentz-violating operators induced at the loop level in
softly-broken supersymmetric noncommutative QED. Dangerous operators forbidden
in the supersymmetric limit are generated via finite corrections, with the
scale of supersymmetry breaking serving as a gauge-invariant regulator. We
compare the most dangerous loop effects to those obtained in noncommutative
theories truncated by a momentum-space cutoff, and find significantly improved
bounds.


title: $\gamma$-Radiation of thermalized Quark-Gluon-Plasma

abstract:
  Long time ago, photon production was proposed as a probe and a thermometer
for Quark-Gluon Plasma (QGP). However, only recently has the complete
$\alpha_s$ order photon spectrum been obtained. In this paper we give a brief
review of the problematic as well as discuss the ${\cal O}(\alpha_s)$ result.


title: Thirty Years of Precision Electroweak Physics

abstract:
  We discuss the development of the theory of electroweak radiative corrections
and its role in testing the Standard Model, predicting the top quark mass,
constraining the Higgs boson mass, and searching for deviations that may signal
the presence of new physics.


title: Intrinsic Charm in B-Meson Decays

abstract:
  Light cone hadron wave functions support Fock states of arbitrarily high
particle number: their heavy quark content arises naturally through QCD
interactions. We discuss what role c\bar c pairs, intrinsic to a hadron's
structure, can play in B-meson decays. The effects can be prominent in hadronic
decays for which the tree-level contributions are Cabibbo-suppressed, as in
B\to \pi K decay, and they mimic ``charming penguin'' contributions.


title:
Structure change of Cooper pairs in color superconductivity -- Crossover
  from BCS to BEC ? --

abstract:
  We discuss a possibility of transition from color superconductivity of the
standard BCS type at high density, to Bose-Einstein Condensation (BEC) of
Cooper pairs at lower density. Examining two-flavor QCD over a wide range of
baryon density, we found the size of a Cooper pair becomes small enough to be
comparable to the averaged quark-quark distance at lower density. We also
consider the same problem in two-color QCD.


title:
Understanding the genesis of mass: a mystery pointing towards the mirror
  world

abstract:
  We give a pedagogical and concise presentation of dynamical mass generation
involving strongly-interacting mirror fermions. As a paradigm which has been
explicitly shown to predict correctly the weak scale and the weak angle and
thus addressing successfully the essence of the hierarchy problem of energy
scales (contrary to "supersymmetric" or "extra-dimension" models) and the
unification of fundamental forces, it might have already manifested indirectly
its validity experimentally, as first noted by the author in 1998, via the
bottom-quark forward-backward asymmetry and the related coupling parameter A_b.
After a decade during which the particle-physics community was frequently
misled by a particularly obscurantist interpretation of the L.E.P./S.L.C.
precision data, this approach emerges as a strong candidate for new physics
beyond the standard model of elementary particles to be thoroughly tested in
the forthcoming high-energy experiments.


title:
The Physics Potential of Future Long Baseline Neutrino Oscillation
  Experiments

abstract:
  We discuss in detail different future long baseline neutrino oscillation
setups and we show the remarkable potential for very precise measurements of
mass splittings and mixing angles. Furthermore it will be possible to make
precise tests of coherent forward scattering and MSW effects, which allow to
determine the sign of $\Delta m^2$. Finally strong limits or measurements of
leptonic CP violation will be possible, which is very interesting since it is
most likely connected to the baryon asymmetry of the universe.


title: Bosonic Corrections to $\Delta r$ at the Two Loop Level

abstract:
  The details of the recent calculation of the two-loop bosonic corrections to
the muon lifetime in the Standard Model are presented. The matching on the
Fermi theory is discussed. Renormalisation in the on-shell and in the MS scheme
is studied and transition between the schemes is shown to lead to identical
results. High precision numerical methods are compared with mass difference and
large mass expansions.


title: Transversity and Meson Photoproduction

abstract:
  Both meson photoproduction and semi-inclusive deep inelastic scattering can
potentially probe transversity in 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 transverse polarization asymmetry is
examined. We use a dynamical model to calculate the asymmetry and relate that
to the transversity distribution of the nucleon.


title:
Long-term damage induced by hadrons in silicon detectors for uses at the
  LHC-accelerator and in space missions

abstract:
  In the present paper, the phenomenological model developed by the authors in
previous papers has been used to evaluate the degradation induced by hadron
irradiation at the future accelerator facilities or by cosmic protons in high
resistivity silicon detectors. The damage has been analysed at the microscopic
(defects production and their evolution toward equilibrium) and at the
macroscopic level (changes in the leakage current of the p-n junction). The
rates of production of primary defects, as well as their evolution toward
equilibrium have been evaluated considering explicitly the type of the
projectile particle and its energy. Vacancy-interstitial annihilation,
interstitial migration to sink, complex (VP, VO, CiOi, CiCs) and divacancy
formation are taken into account for different initial silicon material. The
influence of these defects on the leakage detector current has been calculated
in the frame of the Schokley-Read-Hall model.


title: Production of gauge bosons plus jets in hadronic collisions

abstract:
  A computational strategy and a collection of codes are presented for studying
multiparticle final states in hard hadronic collisions.


title:
Higgs Doublets as Pseudo Nambu-Goldstone Bosons in Supersymmetric E_6
  Unification

abstract:
  The idea to have Higgs doublets as pseudo Nambu-Goldstone (PsNG) multiplet is
examined in the framework of supersymmetric E_6 unified theory. We show that
extra PsNG multiplets other than the expected Higgs doublets necessarily appear
in the E_6 case. If we demand that the extra PsNG multiplets neither disturb
the gauge coupling unification nor make the color gauge coupling diverge before
unification occurs, only possibility for the extra PsNG is 10+\bar{10} of
SU(5). This is realized when the symmetry breaking E_6 \to SO(10) occurs in the
\phi(27)+\phi(\bar{27}) sector while E_6 \to SU(4)_C\times SU(2)_L\times
U(1)\times U(1) in the \Sigma(78) sector. The existence of 10+\bar{10}
multiplets with mass around 1 TeV is therefore a prediction of this E_6 PsNG
scenario. Implication of their existence on the proton decay is also discussed.


title: Matching the Electroweak Penquins Q_7 and Q_8

abstract:
  We report on recent advances on the computation of the matrix elements of the
electroweak penguins Q_7 and Q_8 which are relevant for the Delta I=3/2
contribution to epsilon'_K in the chiral limit. The matching of scale and
scheme dependences between Wilson coefficients and these matrix elements is
done analytically at NLO in alpha_S.


title:
Does CPT violation affect the B_d meson life times and decay
  asymmetries?

abstract:
  We study indirect CPT violating effects in B_d meson decays and mixing,
taking into account the recent constraints on the CPT violating parameters from
the Belle collaboration. The life time difference of the B_d meson mass
eigenstates, expected to be negligible in the standard model and many of its
CPT conserving extensions, could be sizeable (\sim a few percent of the total
width) due to breakdown of this fundamental symmetry. The time evolution of the
direct CP violating asymmetries in one amplitude dominated processes (inclusive
semileptonic B_d decays, in particular) turn out to be particularly sensitive
to this effect.


title:
The Strange Quark Mass, alpha_s and the Chiral Limit Electroweak Penguin
  Matrix Elements From Hadronic Tau Decay Data

abstract:
  Hadronic tau decay data provides access to the light quark vector (V) and
axial vector (A) spectral functions. This makes possible investigations of the
dynamics of QCD at intermediate scales and improved determinations of certain
QCD/Standard Model parameters. We discuss three such applications: (1) the
investigation of the nature of duality violation in QCD at intermediate scales
(and its relation to the determination of alpha_s); (2) the extraction of m_s
from flavor-breaking differences of flavor 'ud' and 'us' data; and (3) the
determination of the dimension D=6 term in the OPE for the flavor 'ud' V-A
correlator difference. The latter is relevant to the evaluation of the chiral
limit values of the K-->pi pi electroweak penguin matrix elements, and hence to
our understanding of expectations for epsilon'/epsilon in the Standard Model.


title: Present Status of epsilon'/epsilon

abstract:
  We give the recent experimental results and theoretical analysis of CP
violating ratio epsilon'/epsilon. The present status is discussed in the light
of the standard model.


title: K-essential Leptogenesis

abstract:
  K-essence is a possible candidate for dark energy of the Universe. In this
paper we consider couplings of k-essence to the matter fields of the standard
electroweak theory and study the effects of the cosmological CPT violation
induced by the CPT violating {\bf Ether} during the evolution of the k-essence
scalar field on the laboratory experiments and baryogenesis. Our results show
that the matter and antimatter asymmetry can be naturally explained {\it via}
leptogenesis without conflicting with the experimental limits on CPT violation
test. The mechanism for baryogenesis proposed in this paper provides a unified
picture for dark energy and baryon matter of our Universe and allows an almost
degenerate neutrino mass pattern with a predicted rate on the neutrinoless
double beta decays accessible to the experimental sensitivity in the near
future.


title: Large mixing angle oscillations as a probe of the deep solar interior

abstract:
  We re-examine the sensitivity of solar neutrino oscillations to noise in the
solar interior using the best current estimates of neutrino properties. Our
results show that the measurement of neutrino properties at KamLAND provides
new information about fluctuations in the solar environment on scales to which
standard helioseismic constraints are largely insensitive. We also show how the
determination of neutrino oscillation parameters from a combined fit of KamLAND
and solar data depends strongly on the magnitude of solar density fluctuations.
We argue that a resonance between helioseismic and Alfven waves might provide a
physical mechanism for generating these fluctuations and, if so,
neutrino-oscillation measurements could be used to constrain the size of
magnetic fields deep within the solar radiative zone.


title: Does A Narrow Tetraquark $cc\bar{u}\bar{d}$ State Exist?

abstract:
  The existence of a shallow or virtual tetraquark state, $cc\bar{u}\bar{d}$,
is discussed. Using the putative masses for the doubly charmed baryons
($ccu/ccd$) from SELEX, the mass of the $cc\bar{u}\bar{d}$ state is estimated
to be about $3.9 GeV$, only slightly above the $DD^*$ threshold. The
experimental signatures for various $cc\bar{u}\bar{d}$ masses are also
discussed.