title:
Duality in semileptonic inclusive B-decays in potential models: regular
  versus singular potentials

abstract:
  Making use of the nonrelativistic potential model for the description of
mesons, and working in the Shifman-Voloshin limit, we compare the integrated
rate $\Gamma(B\to X_cl\nu)$ calculated as a sum of the individual decay rates
to the quantum-mechanical analog of the OPE. In the case of a potential regular
at the origin, we find a well-defined duality violation, which is however
exponentially small. It corresponds to the charm resonances kinematically
forbidden in the decay process, but apparently picked up by the OPE. For
singular potentials, we do not obtain a full OPE series, but only a limited
Taylor expansion, since the cofficients become infinite beyond some order. In
this case, we do not find an indication of duality violation: the difference is
smaller than the last term of the limited expansion. This emphasizes that the
case of singular potentials, which may be relevant for QCD, deserves further
study.


title: Cosmological Constraints on an Invisibly Decaying Higgs Boson

abstract:
  Working in the context of a proposal for collisional dark matter, we derive
bounds on the Higgs boson coupling $g^{\prime}$ to a stable light scalar
particle, which we refer to as phion ($\phi$), required to solve problems with
small scale structure formation which arise in collisionless dark matter
models. We discuss the behaviour of the phion in the early universe for
different ranges of its mass. We find that a phion in the mass range of 100 MeV
is excluded and that a phion in the mass range of 1 GeV requires a large
coupling constant, $g^{\prime} \gsim 2$, and $m_h \lsim 130$ GeV in order to
avoid overabundance, in which case the invisible decay mode of the Higgs boson
would be dominant.


title:
Charge and Color Breaking conditions associated with the top quark
  Yukawa coupling

abstract:
  In the MSSM, the Charge and Color Breaking (CCB) vacuum in the plane
$(H_2,\tilde{t}_L, \tilde{t}_R)$ typically deviates largely from all D-flat
directions, due to the large effects induced by the presence of the top quark
Yukawa coupling. As a result, the critical CCB bound on the trilinear soft term
$A_t$ becomes more restrictive than the D-flat bound $A_t^2 \le 3
(m_{\tilde{t}_L}^2+m_{\tilde{t}_R}^2+m_2^2)$. For large $\tan \beta$, we
consider the effect of a splitting between the soft squark masses
$m_{\tilde{t}_L},m_{\tilde{t}_R}$ on this optimal CCB bound and give a useful
approximation for it, accurate within 1% in all interesting phenomenological
cases. The physical implications on the top squark mass spectrum and the
one-loop upper bound on the lightest CP-even Higgs boson mass are also
discussed in a model-independent way.


title: Geometric CP Violation with Extra Dimensions

abstract:
  We discuss how CP symmetry can be broken geometrically through orbifold
projections in hidden extra dimensions in the context of D-brane models for
particle unifications. We present a few toy models to illustrate the idea and
suggest ways to incorporate this technique in the context of realistic models.


title:
Twist-three observables in deeply virtual Compton scattering on the
  nucleon

abstract:
  We study twist-three effects in deeply virtual Compton scattering on an
unpolarized spin-1/2 target. A careful definition of observables as Fourier
moments w.r.t. the azimuthal angle allows for a clear separation of twist-two
and -three effects. Although the latter are power suppressed, they give leading
contributions to the twist-three asymmetries and do not affect the twist-two
observables.


title: The prompt photon photoproduction at THERA

abstract:
  We present NLO QCD predictions for the prompt photon photoproduction at the
THERA, and compare them with results for the HERA collider.


title: Strategies for The Determination of phi3 in B- -> D0 K-

abstract:
  Direct CP violation in decays such as B- -> D0 K- is sensitive to the CKM
angle phi_3 because these decays allow the interference of b-quark to c-quark
with b-quark to u-quark transitions. Indeed, phi_3 may be determined if one can
infer the strong phase of the B and subsequent D0 decays from experimental
data. In this talk, I will discuss how this can be carried out using either a
single decay mode of the D0 by combining data from a number of D0 decay modes
as well as the use of other, analogous decays and the prospects of implementing
such methods at various B-factories. Since the properties of the D0 decays are
crucial to these methods, it is possible that D0-D0-bar mixing at the 1% level
will contaminate the results. I will therefore discuss various methods to
remove such confounding effects so that phi-3 may be determined even if such
mixing is present.


title: Axions and a Gauged Peccei-Quinn Symmetry

abstract:
  The axion solution to the strong CP problem requires an anomalous global U(1)
symmetry. We show that the existence of such a symmetry is a natural
consequence of an extra dimension in which a gauged U(1) is spontaneously
broken on one of two branes, leaving an accidental global symmetry on the other
brane. Depending on where the standard model matter lives, the resulting axion
can be either the DFSZ or hadronic type. Gaugino-mediated supersymmetry
breaking fits comfortably in our framework. In addition, we present a model in
which the supersymmetry-breaking and Peccei-Quinn breaking scales are naturally
of the same size.


title:
Reply to "Comment about pion electroproduction and the axial form
  factors"

abstract:
  It is shown that comments by Guichon [hep-ph/0012126], and also by Bernard,
Kaiser, and Mei{\ss}ner [hep-ph/0101062], regarding my recent criticism [Phys.
Rev. Lett. 85, 3576 (2000)] of how the axial form factor is supposed to enter
pion electroproduction do not address the main point of my argument and
therefore are irrelevant.


title: Inflationary Baryogenesis

abstract:
  In this letter we explore the possibility of creating the baryon asymmetry of
the universe during inflation and reheating due to the decay of a field
associated with the inflaton. CP violation is attained by assuming that this
field is complex with a phase that varies as the inflaton evolves. We consider
chaotic and natural inflation scenarios. In the former case, the complex
decaying field is the inflaton itself and, in the latter case, the phase of the
complex field is the inflaton. We calculate the asymmetry produced using the
Bogolyubov formalism that relates annihilation and creation operators at late
time to the annihilation and creation operators at early time.


title: Standard Model Parameters and the Cosmological Constant

abstract:
  Simple functional relations amongst standard model couplings, including
gravitional, are conjectured. Possible implications for cosmology and future
theory are discussed.


title: The strange border of the QCD phases

abstract:
  We address the flavour composition along the border between the hadronic and
the quark-gluon plasma phases of QCD. The ratio of strange to up and down
antiquarks ($\lambda_s$) produced in partic le and nuclear collisions, is found
to increase in collisions with initially reached energy density ($\epsilon_i$)
up to $\epsilon_{crit}$ $\sim$ 1 GeV/$fm^3$. Above this value it decreases
approximately linearly and reaches its asymptotic value at zero baryon chemical
potential ($\mu_B$). We demonstrate that $\lambda_s$ in nuclear collisions is
approaching its asymptotic value at $\epsilon_i$ $\sim$ 8-9 GeV/$fm^3$,
corresponding to $\sqrt{s}$ $\sim$ 3-8 TeV per nucleon+nucleon pair which will
be reached at the LHC. After correcting for the difference in the chemical
potentials of various colliding systems, $\lambda_s$ universally saturates
across the QCD phase boundary, following the temperature. Recent experimental
puzzles as the increase in the $K/\pi$ ratio in Pb+Pb collisions at 40 GeV per
nucleon, its different behaviour at midrapidity, the decrease of the double
ratio of $K/\pi$(A+A/p+p) in nucleus nucleus over p+p collisions with
increasing $\sqrt{s}$, and the increase of $\lambda_s$ in p+A over p+p
collisions at the same $\sqrt{s}$, are naturally explained. We study the
approach of thermodynamic observables at $\mu_B=0$ to the transition point and
extract an estimate of the critical temperature.


title:
Dynamical Fermion Masses Under the Influence of Kaluza-Klein Fermions in
  Randall-Sundrum Background

abstract:
  The dynamical fermion mass generation on the D3-brane in the Randall-Sundrum
space-time is discussed in a model with bulk fermions in interaction with
fermions on the branes. It is found that the dynamical fermion masses are
generated at the natural (R.-S.) radius of the compactified extra space and may
be made small compared with masses of the Kaluza-Klein modes which is of order
of TeV.


title:
The Distinctive Feature of Weak Interactions and Some of Its
  Subsequences (Impossibility of Generation of Masses and Absence of the MSW
  Effect

abstract:
  In the Quantum theory the wave functions form a full and orthonormalized
functional space. For this reason we can use the equation on eigenfunctions and
eigenstates and find the eigenenergies $E_n$ and eigenfunctions $\Psi_n$ to
determine the physical characteristics of the considered systems (or models).
In the Quantum theory the observed values are the average value of operators.
Since the wave functions create a full and orthonormalized space, the average
values of operators coincide with eigenvalues of operators. This situation
takes place in the case of strong and electromagnetic interactions. However,
the average values of the weak interaction operators are equal to zero since
only the left-handed components of spinors participate in the weak
interactions. It means that in these interactions the connected states cannot
exist. Then the weak interaction of the particles (scatterings, decays) can be
considered only in the framework of the standard perturbative approach. It is
shown that the weak interactions cannot generate masses and the equation for
Green's function of the weak interacting fermions (neutrinos) in the matter
coincides with the equation for Green's function of fermions in vacuum. And in
the result we come to a conclusion: the mechanism of resonance enhancement of
neutrino oscillations in matter (i.e. MSW effect) cannot exist.


title: On the Deconfinement Phase Transition in Heavy-Ion Collisions

abstract:
  The factorial moments (FM) of multiplicity distribution are used to study the
deconfinement phase transition in heavy-ion collisions. The relation between FM
and the partition number, $M$, results positive intermittency exponents,
$\phi_q$. According to the signatures suggested from certain statistical
models, the two-dimensional results of the dependence of $\phi_q/\phi_2$,
anomalous fractal, $d_q/d_2$ and R\'enyi dimensions, ${\cal R}_q/{\cal R}$, and
the normalized exponents, $\zeta_q$, on the orders of FM evidently supply
evidence for the quark-hadron phase transition in Pb+Pb collisions at 158 AGeV.


title: Quark/gluon content of eta(1295) and eta(1440)

abstract:
  The quark/gluon content of eta(1295) and eta(1440) mesons is discussed,
mesons being considered as members of the first radial excitation 2^1S_0 qqbar
nonet. Recent results on eta(1295) and eta(1440) two-photon widths from L3
together with the information on radiative J/Psi decay allow one to evaluate
the eta(1295)/eta(1440) mixing angle and the admixture of the glueball
component. We found that eta(1440) is dominantly non-strange qqbar state, with
a possible admixture of the glueball component (20 pm 20)%.


title: Regeneration of Anti-Protons in Ultrarelativistic Heavy-Ion Collisions

abstract:
  The production and annihilation of antiprotons in the hadronic phase of
heavy-ion collisions is evaluated within a thermal equilibrium approach. It is
shown that the inverse reaction of $p\bar p$ annihilation (i.e., multi-pion
annihilation $N_\pi \pi\to p\bar p$ with $N_\pi\simeq$~5-7) in connection with
oversaturation of pion phase space (i.e., finite pion chemical potentials)
plays an important role in understanding the observed antiproton yields at SpS
energies within the standard picture of subsequent chemical and thermal
freezeout. Implications for RHIC energies are also addressed.


title:
Rare Kaon Decay K^+ --> \pi^+ \nu \bar{\nu} in SU(3)_C X SU(3)_L X
  U(1)_N Models

abstract:
  The rare kaon decay K^+ --> \pi^+ \nu \bar{\nu} is considered in the
framework of the models based on the SU(3)_C X SU(3)_L X U(1)_N (3 - 3 - 1)
gauge group. It is shown that a lower bound of the Z' mass in the 3 - 3 - 1
model with right-handed neutrinos at a value of 3 TeV is derived, while that in
the minimal version -- 1.7 TeV.


title: Charm Physics and the Poor Sleeper's Impatience

abstract:
  After a short review of the theoretical tools available to describe heavy
flavour physics I sketch the present profile of the weak dynamics of charm
hadrons with respect to lifetimes, oscillations and CP violation. I argue that
comprehensive studies of charm decays provide novel portals to New Physics and
suggest some benchmark figures for desirable sensitivities.


title:
Determination of the angle $\gamma$ from nonleptonic $B_c \to D_s D^0$
  decays

abstract:
  We note that the two body nonleptonic pure tree decays $B_c^\pm \to D_s^\pm
D^0(\bar D^0)$ and the corresponding vector-vector modes $B_c^\pm \to D_s^{*
\pm} D^{*0}(\bar D^{* 0}) $ are well suited to extract the weak phase $\gamma$
of the unitarity triangle. The CP violating phase $\gamma$ can be determined
cleanly as these decay modes are free from the penguin pollutions.


title:
Multiplicities and Transverse Energies in Central AA Collisions at RHIC
  and LHC from pQCD, Saturation and Hydrodynamics

abstract:
  We compute the particle multiplicities and transverse energies at central and
nearly central AA collisions at RHIC and LHC. The initial state is computed
from perturbative QCD supplemented by the conjecture of saturation of produced
partons. The expansion stage is described in terms of hydrodynamics assuming
longitudinal boost invariance and azimuthal symmetry. Transverse flow effects,
a realistic list of hadrons and resonance decays are included. Comparison with
the data of the multiplicities at $\sqrt s=56$ AGeV and 130 AGeV from RHIC is
done and predictions for the full RHIC energy and LHC energy are made for the
multiplicities and transverse energies. The reduction from the initially
released minijet transverse energy to the $E_T$ in the final state is less than
in the one-dimensional case but still dramatic: a factor of 2.7 at RHIC, and
3.6 at the LHC.


title: CP Violation in Higgs-Boson Interactions

abstract:
  We consider a general two-Higgs-doublet model with CP violation in the scalar
sector, that leads, at the one-loop level of the perturbation expansion, to
CP-violation in the process $e^+e^- \to t\bar{t} \to l^\pm ...$ and $e^+e^- \to
t\bar{t} \to b/\bar{b} ...$. The goal of this study is to include {\it
consistently} CP-violating effects in distributions of top-quark decay products
($l^\pm$ or $b/\bar{b}$) that emerge {\it both} from $t\bar{t}$ production {\it
and} from $t$ or $\bar{t}$ decay processes.


title:
Neutrino scattering on polarized electron target and neutrino magnetic
  moment

abstract:
  The completed and proposed experiments for the measurement of the neutrino
magnetic moment are discussed. To improve the sensitivity of the search for the
neutrino magnetic moment we suggest to use a polarized electron target in the
processes of neutrino (antineutrino) -- electron scattering. It is shown that
in this case the weak interaction term in the total cross section is few times
smaller comparing with unpolarized case, but the electromagnetic term does not
depend on electron polarization.


title:
A fast and precise method to solve the Altarelli-Parisi equations in x
  space

abstract:
  A numerical method to solve linear integro-differential equations is
presented. This method has been used to solve the QCD Altarelli-Parisi
evolution equations within the H1 Collaboration at DESY-Hamburg. Mathematical
aspects and numerical approximations are described. The precision of the method
is discussed.


title:
Nonperturbative vacuum and condensates in QCD below thermal phase
  transition

abstract:
  Thermodynamic properties of the QCD nonperturbative vacuum with two light
quarks are studied. It is shown that at low temperatures T<M_\pi relativistic
massive pions can be treated within the dilute gas approximation. Analytic
temperature dependence of the quark condensate is found in perfect agreement
with the numerical calculations obtained at the three-loop level of the chiral
perturbation theory with non-zero quark mass. The gluon condensate slightly
varies with the increase of the temperature. It is shown that the temperature
derivatives of the anomalous and normal (quark massive term) contributions to
the trace of the energy-momentum tensor in QCD are equal to each other in the
low temperature region.


title: Total Cross Sections

abstract:
  A unified approach to total cross-sections, based on the QCD contribution to
the rise with energy, is presented for the processes $pp$, $p{\bar p}$, $\gamma
p, \gamma \gamma, e^+e^- \to hadrons$. For proton processes, a discussion of
the role played by soft gluon summation in taming the fast rise due to
mini-jets is presented. For photon-photon processes, a comparison with other
models indicates the need for precision measurements in both the low and high
energy region, likely only with measurements at future Linear Colliders.


title: On the metastability of the Standard Model vacuum

abstract:
  If the Higgs mass m_H is as low as suggested by present experimental
information, the Standard Model ground state might not be absolutely stable. We
present a detailed analysis of the lower bounds on m_H imposed by the
requirement that the electroweak vacuum be sufficiently long-lived. We perform
a complete one-loop calculation of the tunnelling probability at zero
temperature, and we improve it by means of two-loop renormalization-group
equations. We find that, for m_H=115 GeV, the Higgs potential develops an
instability below the Planck scale for m_t>(166\pm 2) GeV, but the electroweak
vacuum is sufficiently long-lived for m_t < (175\pm 2) \GeV.


title: Chiral effective theory of strong interactions

abstract:
  The review of chiral effective theory (CET) is given. CET is based on quantum
chromodynamics and describes the processes of strong interaction at low
energies. It is proved, that CET comes as a consequence of the spontaneous
violation of chiral symmetry in QCD - the appearance of chiral symmetry
violating vacuum condensates. The Goldstone theorem for the case of QCD is
proved and the existence of the octet of massless Goldstone bosons (pi, K, eta)
is demonstrated in the limit of massless u,d,s quarks (or the triplet of
massless pions in the limit m_u,m_d->0). It is shown, that the same phenomenon
- the appearance of quark condensate in QCD - which causes the Goldstone
bosons, results in appearance of violating chiral symmetry massive baryons. The
general form of CET Lagrangian is derived. Few examples of higher order
corrections to tree diagrams in CET are given. The Wess-Zumino term (of order
p^4 term in CET Lagrangian) is presented. Low energy sum rules are presented.
QCD and CET at finite temperature are discussed. In the framework of CET the
T^2 correction to quark condensate in QCD at finite temperature T is calculated
and the results of higher order temperature corrections are demonstrated. These
results indicate on phase transition in QCD at T \sim 150-200 MeV. The mixing
of current correlators in order T^2 is proved.


title: Penguin Contractions and Factorization in B -> K pi Decays

abstract:
  We study Lambda_{QCD}/m_B corrections to factorization in B -> K pi decays.
First, we analyze these decay channels within factorization, showing that,
irrespectively of the value of gamma, it is not possible to reproduce the
experimental data. Then, we discuss Lambda_{QCD}/m_B corrections to these
processes, and argue that there is a class of doubly Cabibbo enhanced
non-factorizable contributions, usually called charming penguins, that cannot
be neglected. Including these corrections, we obtain an excellent agreement
with experimental data. Furthermore, contrary to what is obtained with
factorization, we predict sizable rate asymmetries in B^\pm -> K^\pm \pi^0 and
B -> K^\pm pi^\mp.


title: The heavy baryons in the nonperturbative string approach

abstract:
  We present some piloting calculations of the short-range correlation
coefficients for the light and heavy baryons and masses of the doubly heavy
baryons $\Xi_{QQ'}$ and $\Omega_{QQ'}$ ($Q,Q'=c,b$) in the framework of the
simple approximation within the nonperturbative QCD approach.


title: Resummed B -> X_u l nu Decay Distributions to Next-to-Leading Order

abstract:
  We perform factorization of the most general distribution in semileptonic B
-> X_u decays and we resum the threshold logarithms to next-to-leading order.
  From this (triple-differential) distribution, any other distribution is
obtained by integration. As an application of our method, we derive simple
analytical expressions for a few distributions, resummed to leading
approximation. It is shown that the shape function can be directly determined
by measuring the distribution in m_X^2/E_X^2, not in m_X^2/m_B^2. We compute
the resummed hadron energy spectrum, which has a ``Sudakov shoulder'', and we
show how the distribution in the singular region is related to the shape
function. We also present an improved formula for the photon spectrum in B->X_s
gamma which includes soft-gluon resummation and non-leading operators in the
effective hamiltonian. We explicitly show that the same non-perturbative
function - namely the shape function - controls the non-perturbative effects in
all the distributions in the semi-leptonic and in the rare decay.


title: Non-adiabatic level crossing in (non-) resonant neutrino oscillations

abstract:
  We study neutrino oscillations and the level-crossing probability
$P_{LZ}=\exp(-\gamma_n\F_n\pi/2)$ in power-law like potential profiles
$A(r)\propto r^n$. After showing that the resonance point coincides only for a
linear profile with the point of maximal violation of adiabaticity, we point
out that the ``adiabaticity'' parameter $\gamma_n$ can be calculated at an
arbitrary point if the correction function $\F_n$ is rescaled appropriately. We
present a new representation for the level-crossing probability,
$P_{LZ}=\exp(-\kappa_n\G_n)$, which allows a simple numerical evaluation of
$P_{LZ}$ in both the resonant and non-resonant cases and where $\G_n$ contains
the full dependence of $P_{LZ}$ on the mixing angle $\theta$. As an application
we consider the case $n=-3$ important for oscillations of supernova neutrinos.


title: Quark-Hadron Duality in Structure Functions

abstract:
  While quark-hadron duality is well-established experimentally, the current
theoretical understanding of this important phenomenon is quite limited. To
expose the essential features of the dynamics behind duality, we use a simple
model in which the hadronic spectrum is dominated by narrow resonances made of
valence quarks. We qualitatively reproduce the features of duality as seen in
electron scattering data within our model. We show that in order to observe
duality, it is essential to use the appropriate scaling variable and scaling
function. In addition to its great intrinsic interest in connecting the
quark-gluon and hadronic pictures, an understanding of quark-hadron duality
could lead to important benefits in extending the applicability of scaling into
previously inaccessible regions.


title: Out-of-equilibrium phenomena in high energy nuclear collisions

abstract:
  In the first part we study the possibility that a Disoriented Chiral
Condensate (DCC) forms when hot hadronic matter is quenched, using the linear
sigma model. We formulate an original sampling strategy for the initial field
configuration in order to get an estimate of the probability that a potentially
observable coherent pion field appears in a heavy-ion collision. We obtain a
probability of the order of 1/1000 at CERN SPS energies. Next, we study the
correlation between isospin orientations of the distinct modes of the pion
field emerging after a quench. We show that this correlation is absent: the
distinct modes behave as distinct DCCs. This contradicts the common belief that
the state produced in the simplest form of the quench scenario - with a fully
thermalized initial state - is identical to the originally proposed DCC. In the
second part, we investigate the role of elastic scatterings in the process of
kinetic equilibration of gluons produced in the very early times of the
collision. We compare the two available scenarios describing the initial
conditions: saturation and minijet production. We treat the elastic processes
in the small scattering angle limit and work in the relaxation time
approximation. By measuring the isotropy of different observables as a function
of time, we show that the usual assumption that elastic collisions are
efficient enough to rapidly achieve kinetic equilibrium is not reliable. Due to
the longitudinal expansion at early times, the actual equilibration time is an
order of magnitude bigger than the typical 1 fm estimate usually assumed.


title: The Z ->anti-b b decay asymmetry: lose-lose for the Standard Model

abstract:
  Combining precision measurements and the Higgs boson search limit, the
electroweak data has evolved to a point where new physics is favored whether
the 3.2 sigma A_{FB}^b anomaly is genuine or not. Such new physics could
greatly alter the inferred value of the Higgs boson mass.


title: J/Psi Production at RHIC in a QGP

abstract:
  In central collisions at RHIC, the initial production of heavy quarks will
for the first time yield multiple pairs of c-cbar in each central event. If a
region of deconfined quarks and gluons is subsequently formed, a new mechanism
for the formation of heavy quarkonium bound states will be activated. This will
result from the mobility of heavy quarks in the deconfined region, such that
bound states can be formed from a quark and an antiquark which were originally
produced in separate incoherent interactions. Our model estimates of this
effect predict a dramatic increase in the number of observed J/Psi at RHIC,
over that predicted from extrapolation of color-screening or gluon dissociation
mechanisms from the lower CERN-SPS energies. The centrality and energy
dependence of this effect should be readily observable by the Star and Phenix
detectors. Thus the J/Psi abundance at RHIC will continue to provide a
signature of QGP formation. However, it is in this environment a more useful
probe, since contrary to prior expectations this large predicted J/Psi
abundance should be relatively easy to measure.


title:
CP violation in the inclusive b -> s g decay in the framework of multi
  Higgs doublet models

abstract:
  We study the decay width and CP asymmetry of the inclusive process b--> s g
(g denotes gluon) in the multi Higgs doublet models with complex Yukawa
couplings, including next to leading QCD corrections. We analyse the
dependencies of the decay width and CP asymmetry on the scale \mu and CP
violating parameter \theta. We observe that there exist an enhancement in the
decay width and CP asymmetry is at the order of 10^{-2}.


title: New physics in CP violation experiments

abstract:
  CP violation plays a privileged role in our quest for new physics beyond the
electroweak standard model (SM). In the SM the violation of CP in the weak
interactions has a single source: the phase of the quark mixing matrix (the CKM
matrix, for Cabibbo-Kobayashi-Maskawa). Most extensions of the SM exhibit new
sources of CP violation. For instance, the truly minimal supersymmetric
extension of the SM (CMSSM) has two new phases in addition to the CKM phase.
Given that CP violation is so tiny in the kaon system, is still largely
unexplored in B physics and is negligibly small in the electric dipole moments,
it is clear that new physics may have a good chance to manifest some departure
from the SM in this particularly challenging class of rare phenomena. On the
other hand, it is also apparent that CP violation generally represents a major
constraint on any attempt at model building beyond the SM. In this review we
tackle these two sides of the relation between CP violation and new physics.
Our focus will be on the potentialities to use CP violation as a probe on
Supersymmetric (SUSY) extensions of the SM. We wish to clarify the extent to
which such indirect signals for SUSY are linked to a fundamental theoretical
issue: is there a relation between the mechanism that originates the whole
flavor structure and the mechanism that is responsible for the breaking of
supersymmetry? Different ways to answer this question lead to quite different
expectations for CP violation in B physics.


title:
New Underground Neutrino Observatory - GENIUS- in the New Millenium :
  for Solar Neutrinos, Dark Matter and Double Beta Decay

abstract:
  Double beta decay is indispensable to solve the question of the neutrino mass
matrix together with $\nu$ oscillation experiments. The most sensitive
experiment since eight years - the Heidelberg-Moscow experiment in Gran-Sasso -
already now, with the experimental limit of < m_\nu > < 0.26 eV excludes
degenerate $\nu$ mass scenarios allowing neutrinos as hot dark matter in the
universe for the small angle MSW solution of the solar neutrino problem. It
probes cosmological models including hot dark matter already now on the level
of future satellite experiments MAP and PLANCK. It further probes many topics
of beyond Standard Model physics at the TeV scale. Future experiments should
give access to the multi-TeV range and complement on many ways the search for
new physics at future colliders like LHC and NLC. For neutrino physics GENIUS
will allow to test almost all neutrino mass scenarios allowed by the present
neutrino oscillation experiments. At the same time GENIUS will cover a wide
range of the parameter space of predictions of SUSY for neutralinos as cold
dark matter. Further it has the potential to be a real-time detector for
low-energy (pp and 7Be) solar neutrinos. A GENIUS Test Facility has just been
funded and will come into operation by end of 2001.


title: Weak Decays Of Heavy Mesons In A Covariant Quark Model

abstract:
  In this paper we investigate weak decays of heavy mesons in the framework of
a covariant quark model, which is based on the Bethe-Salpeter equation in
instantaneous approximation. Apart from a phenomenological confinement
potential, a residual interaction induced by instantons is adopted. Masses and
many decay observables of light mesons have already been described successfully
in this model. An appropiate extension allows a unified description of light
and heavy systems.
  Using a set of parameters which are fixed by the mass spectra, we evaluate
the form factors of semileptonic decays of charmed and bottom mesons. In the
heavy quark limit these can be reduced to the Isgur-Wise function, which is
calculated. Finally the form factors are used to determine the non-leptonic
decay rates of B mesons in the factorization approximation.


title:
Gluon Pair Production from a Space-Time Dependent Classical Chromofield
  via Vacuum Polarization

abstract:
  We investigate the production of gluon pairs from a space-time dependent
classical chromofield via vacuum polarization within the framework of the
background field method of QCD. The investigation of the production of gluon
pairs is important in the study of the evolution of the quark-gluon plasma in
ultra-relativistic heavy-ion collisions at RHIC and LHC.


title: A remark on higher dimension induced domain wall defects in our world

abstract:
  There has been recent interest in new types of topological defects arising in
models with compact extra dimensions. We discuss in this context the old
statement that if only SU(N) gauge fields and adjoint matter live in the bulk,
and the coupling is weak, then the theory possesses a spontaneously broken
global Z(N) symmetry, with associated domain wall defects in four dimensions.
We discuss the behaviour of this symmetry at high temperatures. We argue that
the symmetry gets restored, so that cosmological domain wall production could
be used to constrain such models.


title: Charmonium Production off Nuclei: from SPS to RHIC

abstract:
  Physics of charmonium suppression in nuclear collisions drastically changes
between the energies of SPS and RHIC. Mechanisms suppressing charmonia at SPS
are reviewed, neither of which is important at RHIC. On the other hand,
coherence, or shadowing of c-quarks and gluons barely seen at SPS, become a
dominant effect at RHIC providing a much stronger suppression. A onset of
coherence at Fermilab energies explains the observed cross section ratio
steeply falling at large Feynman x_F. In nuclear collisions variation of
charmonium suppression with x_F suggests a sensitive probe for QGP.


title:
The thermodynamics of the quark-gluon plasma: Self-consistent
  resummations vs. lattice data

abstract:
  We discuss a recent approach for overcoming the poor convergence of the
perturbative expansion for the thermodynamic potential of QCD. This approach is
based on self-consistent approximations which allow for a gauge-invariant and
manifestly ultraviolet-finite resummation of the essential physics of the hard
thermal/dense loops. The results thus obtained are in good agreement with
available lattice data down to temperatures of about twice the critical
temperature. Calculations for a plasma with finite quark density (i.e., with a
non-zero chemical potential $\mu$) are no more difficult than at $\mu=0$.


title: Quark mass effects in B -> Xs gamma

abstract:
  The charm-loop contribution to B -> Xs gamma is found to be numerically
dominant and very stable under logarithmic QCD corrections. The strong
enhancement of the branching ratio by QCD logarithms is mainly due to the
b-quark mass evolution in the top-quark sector. These observations allow us to
achieve better control over residual scale dependence at the next-to-leading
order. Furthermore, we observe that the sensitivity of the matrix element < Xs
gamma | (sc)_(V-A)(cb)_(V-A) | b > to mc/mb is the source of a sizeable
uncertainty that has not been properly taken into account in previous analyses.
Replacing mc^pole/mb^pole in this matrix element by the more appropriate
mc(mu)/mb^pole with mc < mu < mb causes an 11% enhancement of the SM prediction
for BR[B -> Xs gamma]. For E_gamma > 1.6 GeV in the B-meson rest frame, we find
BR[ B -> Xs gamma]_{E_gamma > 1.6 GeV} = (3.60 +_ 0.30) * 10^-4. The difference
between our result and the current experimental world average is consistent
with zero at the level of 1 sigma. We also discuss the implementation of new
physics effects in our calculation. The lower bound on the charged Higgs boson
mass in 2HDM(II) is found the be higher than 350 GeV.


title: The solar LMA neutrino oscillation solution in the Zee model

abstract:
  We examine the neutrino mass matrix in the version of Zee model where both
Higgs doublets couple to the leptons. We show that in this case one can
accommodate the large mixing angle (LMA) MSW solution of the solar neutrino
problem, while avoiding maximal solar mixing and conflicts with constraints on
lepton family number-violating interactions. In the simplified scenario we
consider, we have the neutrino mass spectrum characterized by $m_1 \simeq m_2
\simeq \sqrt{\Delta m^2_\mathrm{atm}}/\sin 2\theta$ and $m_3/m_1 \simeq \cos
2\theta$, where $\theta$ is the solar mixing angle.


title:
Fermion Mixing and Mass Hierarchy as Consequences of Mass Matrix
  Rotation

abstract:
  It is shown that a fermion mass matrix changing in orientation (rotating)
with changing scales can give a simple yet near-quantitative explanation for
quark mixing, neutrino oscillations and the fermion mass hierarchy.


title: False Vacuum Decay after Inflation

abstract:
  Inflation is terminated by a non-equilibrium process which finally leads to a
thermal state. We study the onset of this transition in a class of hybrid
inflation models. The exponential growth of tachyonic modes leads to
decoherence and spinodal decomposition. We compute the decoherence time, the
spinodal time, the size of the formed domains and the homogeneous classical
fields within a single domain.


title: Parton densities and dipole cross-sections at small x in large nuclei

abstract:
  Unintegrated gluon densities in nuclei, dipole-nucleus cross-sections and
quark densities are numerically investigated in the high-colour limit, with the
scattering on a heavy nucleus exactly described by the sum of fan diagrams of
BFKL pomerons. The initial condition for the evolution in rapidity is quickly
forgotten, and the gluon density presents a "supersaturation" pattern, as
previous studies indicated. Both dipole-nucleus cross-sections and quark
densities present the expected saturation features. Identifying the position in
transverse momentum $l$ of the maximum of the gluon distribution with the
saturation momentum $Q_s(y,b)$, at large rapidities all distributions depend
only on one variable $[l/Q_s(y,b)]$ or $[rQ_s(y,b)]$.


title: The prompt TeV-PeV atmospheric neutrino window

abstract:
  We discuss the possible existence of an observational window, in the TeV-PeV
energy range, for the detection of prompt neutrinos from the decay of charmed
particles produced in cosmic ray interactions with the atmosphere. We calculate
the event rates for muon and tau neutrinos of heavy quark, mostly charm,
origin. We argue that their prompt fluxes are observable in a kilometer-scale
neutrino telescope, even though the calculations are subjected to large
uncertainties, which we quantify. We raise the possibility that a small
component of prompt neutrinos may already be present in the observed samples of
current experiments. We also discuss the interplay of the predicted fluxes with
those produced by the flavor oscillation of conventional atmospheric neutrinos,
and by anticipated cosmic sources.


title: Broken R-parity, stop decays, and neutrino physics

abstract:
  We discuss the phenomenology of the lightest stop in models where R-parity is
broken by bilinear superpotential terms. In this class of models we consider
scenarios where the R-parity breaking two-body decay ~t_1->\tau^+b competes
with the leading three-body decays such as ~t_1->W^+b~\chi^0_1. We demonstrate
that the R-parity violating decay can be sizable and in some parts of the
parameter space even the dominant one. Moreover we discuss the expectations for
\~t_1->\mu^+b and ~t_1->e^+b. The recent results from solar and atmospheric
neutrinos suggest that these are as important as the tau bottom mode. The
\~t_1->l^+b decays are of particular interest for hadron colliders, as they may
allow a full mass reconstruction of the lighter stop. Moreover these decay
modes allow cross checks on the neutrino mixing angle involved in the solar
neutrino puzzle complementary to those possible using neutralino decays. For
the so--called small mixing angle or SMA solution ~t_1->e^+b should be
negligible, while for the large mixing angle type solutions all ~t_1->l^+b
decays should have comparable magnitude.


title: GUT Breaking on the Brane

abstract:
  We present a five-dimensional supersymmetric SU(5) theory in which the gauge
symmetry is broken maximally (i.e. at the 5D Planck scale M_*) on the same 4D
brane where chiral matter is localized. Masses of the lightest Kaluza-Klein
modes for the colored Higgs and X and Y gauge fields are determined by the
compactification scale of the fifth dimension, M_C ~ 10^{15} GeV, rather than
by M_*. These fields' wave functions are repelled from the GUT-breaking brane,
so that proton decay rates are suppressed below experimental limits. Above the
compactification scale, the differences between the standard model gauge
couplings evolve logarithmically, so that ordinary logarithmic gauge coupling
unification is preserved. The maximal breaking of the grand unified group can
also lead to other effects, such as O(1) deviations from SU(5) predictions of
Yukawa couplings, even in models utilizing the Froggatt-Nielsen mechanism.


title: Mixing of three neutrinos in matter

abstract:
  Explicit analytical expression is derived for mixing matrix of three
neutrinos in matter using a set of direct vacuum physical parameters. Results
are presented in simple, symmetrical form. The physical contents are more clear
than using of traditional mixing angles. There is no problem about mixing
orders.


title: Decoupled oscillations and resonances of three neutrinos in matter

abstract:
  In a previous paper, we gave a new theoretical framework in which three
neutrino mixing in matter are discussed. Rigorous analytical solutions are
obtained. In present paper an approximate method is developed for studying
three flavor neutrino oscillations in matter in the new framework. Using
condition of $\Delta m_{1}^{2}\ll \Delta m_{2}^{2}$, decoupled resonances,
which is discovered by Kuo {\it et al.} previously, are obtained without small
angle approximation. Calculation and approximation is consistent and rigorous.
All the formulae appear in simple symmetric form and some physical
characteristic are more explicit. Around the two resonant points, the mass
eigenvalue whose eigenfunction does not take part in the oscillation process,
can be easily calculated to higher precision. We find, the oscillation
amplitude is dominated by vacuum mixing and is smaller than 1 for smaller A
resonance, but it is not in the larger A. This is characteristic for the three
flavor oscillations, but do not exist in two flavor.


title: J/psi plus dijet associated production in two-photon collisions

abstract:
  We study the production of a J/psi meson in association with one or two jets
in gamma gamma collisions concentrating on the direct-photon contribution,
which is expected to be dominant for large J/psi-meson transverse momentum
and/or large dijet invariant mass. We work at leading order in the
factorization formalism of nonrelativistic QCD and include all relevant
colour-octet processes. We present distributions in J/psi-meson transverse
momentum and rapidity appropriate for CERN LEP2, a future e^+e^- linear
collider, and a possible gamma gamma collider mode of the latter. In the case
of the e^+e^- linear collider, we assume the beamstrahlung spectrum appropriate
for DESY TESLA.


title:
Matter-induced vertices for photon splitting in a weakly magnetized
  plasma

abstract:
  We evaluate the three-photon vertex functions at order $B$ and $B^{2}$ in a
weak constant magnetic field at finite temperature and density with on shell
external lines. Their application to the study of the photon splitting process
leads to consider high energy photons whose dispersion relations are not
changed significantly by the plasma effects. The absorption coefficient is
computed and compared with the perturbative vacuum result. For the values of
temperature and density of some astrophysical objects with a weak magnetic
field, the matter effects are negligible.


title:
Gluino Contribution to Radiative B Decays: New Operators, Organization
  of QCD Corrections and Leading Order Results

abstract:
  The gluino-induced contribution to the decay $b \to s \gamma$ is investigated
in supersymmetric frameworks with generic sources of flavour violation. It is
emphasized that the operator basis of the standard model effective Hamiltonian
is enlarged and that a suitable redefinition allows to realize the usual scheme
of leading and next-to-leading logarithmic contributions when QCD corrections
are included. The effects of the leading order
  QCD corrections on the inclusive branching ratio for $b \to s \gamma$ are
shown. Constraints on supersymmetric sources of flavour violation are derived.


title:
Radiative Corrections to the Higgs Boson Mass for a Hierarchical Stop
  Spectrum

abstract:
  An effective theory approach is used to compute analytically the radiative
corrections to the mass of the light Higgs boson of the Minimal Supersymmetric
Standard Model when there is a hierarchy in the masses of the stops (M_st1 >>
M_st2 >> M_top, with moderate stop mixing). The calculation includes up to
two-loop leading and next-to-leading logarithmic corrections dependent on the
QCD and top-Yukawa couplings, and is further completed by two-loop
non-logarithmic corrections extracted from the effective potential. The results
presented disagree already at two-loop-leading-log level with widely used
findings of previous literature. Our formulas can be used as the starting point
for a full numerical resummation of logarithmic corrections to all loops, which
would be mandatory if the hierarchy between the stop masses is large.


title:
The check of QCD based on the tau-decay data analysis in the complex
  q^2-plane

abstract:
  The thorough analysis of the ALEPH data on hadronic tau-decay is performed in
the framework of QCD. The perturbative calculations are performed in 3 and
4-loop approximations. The terms of the operator product expansion (OPE) are
accounted up to dimension D=8. The value of the QCD coupling constant
alpha_s(m_tau^2)=0.355 pm 0.025 was found from hadronic branching ratio R_tau.
The V+A and V spectral function are analyzed using analytical properties of
polarization operators in the whole complex q^2-plane. Borel sum rules in the
complex q^2 plane along the rays, starting from the origin, are used. It was
demonstrated that QCD with OPE terms is in agreement with the data for the
coupling constant close to the lower error edge alpha_s(m_tau^2)=0.330. The
restriction on the value of the gluonic condensate was found
<(alpha_s/pi)G^2>=0.006 pm 0.012 GeV^2. The analytical perturbative QCD was
compared with the data. It is demonstrated to be in strong contradiction with
experiment. The restrictions on the renormalon contribution were found. The
instanton contributions to the polarization operator are analyzed in various
sum rules. In Borel transformation they appear to be small, but not in spectral
moments sum rules.


title:
The Monte Carlo Program KoralW version 1.51 and The Concurrent Monte
  Carlo KoralW&YFSWW3 with All Background Graphs and First Order Corrections to
  W-Pair Production

abstract:
  The version 1.51 of the Monte Carlo (MC) program KoralW for all $e^+e^-\to
f_1\bar f_2 f_3\bar f_4$ processes is presented. The most important change
since the previous version 1.42 is the facility for writing MC events on the
mass storage device and re-processing them later on. In the re-processing one
may modify parameters of the Standard Model in order to fit them to
experimental data. Another important new feature is a possibility of including
complete ${\cal O}(\alpha)$ corrections to double-resonant W-pair
component-processes in addition to all background (non-WW) graphs. The
inclusion is done with the help of the YFSWW3 MC event generator for fully
exclusive differential distributions (event-per-event). Technically, it is done
in such a way that YFSWW3 runs concurrently with KoralW as a separate slave
process, reading momenta of the MC event generated by KoralW and returning the
correction weight to KoralW. KoralW introduces the ${\cal O}(\alpha)$
correction using this weight, and finishes processing the event (rejection due
to total MC weight, hadronization, etc.). The communication between KoralW and
YFSWW3 is done with the help of the FIFO facility of the UNIX/Linux operating
system. This does not require any modifications of the FORTRAN source codes.
The resulting Concurrent MC event generator KoralW&YFSWW3 looks from the user's
point of view as a regular single MC event generator with all the standard
features.


title: Recent theoretical developments in CP violation

abstract:
  We review recent suggestions for testing through B decays the flavor
structure of CP violation in the Standard Model. Relative signs of CP
asymmetries in U-spin related processes can by themselves test the
Kobayashi-Maskawa mechanism in a crude manner. Ratios of charge-averaged decay
rates and certain CP asymmetries may constrain tightly the weak phases
$\gamma=\phi_3$ and $\alpha=\phi_2$.


title:
Exact Results for Supersymmetric Renormalization and the Supersymmetric
  Flavor Problem

abstract:
  We explore the effects of a strongly-coupled, approximately scale-invariant
sector on the renormalization of soft supersymmetry breaking terms. A useful
formalism for deriving exact results for renormalization of soft supersymmetry
breaking terms is given in an appendix, and used to generalize previously known
results to include the effects of nontrilinear superpotential terms. We show
that a class of theories which explain the flavor hierarchy without flavor
symmetries can also solve the supersymmetric flavor problem by producing nearly
degenerate masses for the first two generations of scalar superpartners within
each charge sector. Effects from trilinear scalar terms are also suppressed,
although their initial values must be relatively small. Our mechanism results
in testable predictions for the superpartner spectrum.


title: Parton Distribution Function Uncertainties

abstract:
  We present parton distribution functions which include a quantitative
estimate of its uncertainties. The parton distribution functions are optimized
with respect to deep inelastic proton data, expressing the uncertainties as a
density measure over the functional space of parton distribution functions.
This leads to a convenient method of propagating the parton distribution
function uncertainties to new observables, now expressing the uncertainty as a
density in the prediction of the observable. New measurements can easily be
included in the optimized sets as added weight functions to the density
measure. Using the optimized method nowhere in the analysis compromises have to
be made with regard to the treatment of the uncertainties.


title: Hard Scattering Based Luminosity Measurement at Hadron Colliders

abstract:
  A strategy to determine the luminosity at Hadron Colliders is discussed using
the simultaneous W-boson and Z-boson event counts. The emphasis of the study
will be on the uncertainty induced by the parton density functions.
Understanding this source of uncertainties is crucial for a reliable luminosity
determination using the W-boson and Z-boson events. As an example we will use
the D0 run 1 results to extract the luminosity using the vector boson events
and compare the result with the traditional method. Subsequently we will look
at the implications for the top cross section uncertainties using the extracted
luminosity.


title: Testing the principle of equivalence by supernova neutrinos

abstract:
  We study the possible impact of the neutrino oscillation which could be
induced by a tiny violation of equivalence principle (VEP) for neutrinos
emitted from supernova driven by gravitational collapse. Due to the absence of
any significant indication of neutrino oscillation in the SN1987A data, we
obtain sever bounds on relevant VEP parameters \delta \gamma\lsim O(10^{-31})
for massless or degenerated neutrinos and \delta \gamma \lsim O(10^{-16})\times
[\Delta m^2/10^{-5} eV^2] for massive neutrinos.


title: Moments of the Proton F2 Structure Function at Low Q2

abstract:
  The Q^2 dependence of inclusive electron-proton scattering F_2 structure
function data in both the nucleon resonance region and the deep inelastic
region, at momentum transfers below 5 (GeV/c)^2, is investigated. Moments of
F_2 are constructed, down to momentum transfers of Q^2 ~ 0.1 (GeV/c)^2. The
second moment is only slowly varying with Q^2 down to Q^2 ~ 1 (GeV/c)^2, which
is a reflection of duality. Below Q^2 of 1 (GeV/c)^2, the Q^2 dependence of the
moments is predominantly governed by the elastic contribution, whereas the
inelastic channels still seem governed by local duality.


title:
Muon anomalous magnetic moment in the standard model with two Higgs
  doublets

abstract:
  The muon anomalous magnetic moment is investigated in the standard model with
two Higgs doublets (S2HDM) motivated from spontaneous CP violation. Thus all
the effective Yukawa couplings become complex. As a consequence of the non-zero
phase in the couplings, the one loop contribution from the neutral scalar
bosons could be positive and negative relying on the CP phases. The
interference between one and two loop diagrams can be constructive in a large
parameter space of CP-phases. This will result in a significant contribution to
muon anomalous magnetic moment even in the flavor conserving process with a
heavy neutral scalar boson ($m_h \sim$ 200 GeV) once the effective muon Yukawa
coupling is large ($|\xi_\mu|\sim 50$). In general, the one loop contributions
from lepton flavor changing scalar interactions become more important. In
particular, when all contributions are positive in a reasonable parameter space
of CP phases, the recently reported 2.6 sigma experiment vs. theory deviation
can be easily explained even for a heavy scalar boson with a relative small
Yukawa coupling in the S2HDM.


title:
Probing anomalous quartic gauge-boson couplings via e+e- -->
  4fermions+gamma

abstract:
  All lowest-order amplitudes for e+e- --> 4f+gamma are calculated including
five anomalous quartic gauge-boson couplings that are allowed by
electromagnetic gauge invariance and the custodial SU(2)_c symmetry. Three of
these anomalous couplings correspond to the operators L_0, L_c, and L_n that
have been constrained by the LEP collaborations in WWgamma production. The
anomalous couplings are incorporated in the Monte Carlo generator RACOONWW.
Moreover, for the processes e+e- --> 4f+gamma RACOONWW is improved upon
including leading universal electroweak corrections such as initial-state
radiation. The discussion of numerical results illustrates the size of the
leading corrections as well as the impact of the anomalous quartic couplings
for LEP2 energies and at 500GeV.


title: On predictions of the first results from RHIC

abstract:
  In this talk, I will discuss the predictions of the first results from RHIC:
the charged particle multiplicity $dN_{\rm ch}/d\eta$, its centrality
dependence and the elliptic flow $v_2$.


title: The influence of the hadronic interaction on the pionium wave functions

abstract:
  The influence of the hadronic \pi\pi interaction on the wave functions of
pionium (the Coulomb bound \pi^+\pi^- system) at distances less than 10 fm is
calculated for s-states with principal quantum numbers n<5. Hadronic \pi\pi
potentials are used that reproduce the scattering phase shifts of two-loop
chiral perturbation theory. The pionium wave functions \psi_n (r) are obtained
by integrating the coupled Schr\"odinger equations for the
(\pi^+\pi^-,\pi^0\pi^0) system. We find that, for r<10 fm, n^{3/2} \psi_n (r)
is practically independent of n. From this we conclude that the production
rates of the s-states of pionium are proportional to n^{-3}, a result needed
for the interpretation of the DIRAC experiment currently running at CERN.


title:
Semi-hard scatterings at RHIC and LHC: initial conditions and charged
  multiplicities

abstract:
  Minijet production in ultra-relativistic heavy-ion collisions is discussed by
taking semi-hard parton rescatterings explicitly into account. At both RHIC and
LHC energies we find sizable effects on global characteristics of the nuclear
collision like the initial multiplicity and transverse energy of the minijets.
The dependence of these quantities on the cutoff that separates soft and hard
interactions becomes much smoother after the inclusion of the rescatterings.
This allows to define an energy and centrality dependent saturation cutoff and
to push perturbative computations to rather low values of the cutoff. As an
application we compute the charged multiplicity at mid rapidity and compare it
to the recent RHIC data.


title: RHIC and diffraction in pp Spin-flip

abstract:
  We argue that diffraction (Pomeron) contribution is present in the pp
spin-flip amplitude. RHIC polarization will be able to prove (or disprove) this
conjecture.


title: A New Approach to a Global Fit of the CKM Matrix

abstract:
  We report on a global CKM matrix analysis taking into account most recent
experimental and theoretical results. The statistical framework (Rfit)
developed in this paper advocates formal frequentist statistics. Other
approaches, such as Bayesian statistics or the 95% CL scan method are also
discussed. We emphasize the distinction of a model testing and a model
dependent, metrological phase in which the various parameters of the theory are
determined. Measurements and theoretical parameters entering the global fit are
thoroughly discussed, in particular with respect to their theoretical
uncertainties. Graphical results for confidence levels are drawn in various one
and two-dimensional parameter spaces. Numerical results are provided for all
relevant CKM parameterizations, the CKM elements and theoretical input
parameters. Predictions for branching ratios of rare K and B meson decays are
obtained. A simple, predictive SUSY extension of the Standard Model is
discussed.


title:
Contributions of Vector-Like Quarks to $B \to X_s \gamma$ and $B_s^0
  \bar B_s^0$ Mixing

abstract:
  The radiative decay $\BSgamma$ and the mixing $\BsBs$ are discussed in the
vector-like quark model which contains extra SU(2)-singlet quarks with the same
electric charges as the up-type and down-type quarks. Constraints on the
extended Cabibbo-Kobayashi-Maskawa matrix are obtained from the experimental
results for the branching ratio of $\BSgamma$ . Within these experimental
bounds, any value of the branching ratio can be accounted for by the
contributions from the vector-like quarks. In sizable ranges of the model
parameters, the mixing parameter for $\BsBs$ is much different from the
prediction of the standard model.


title:
On Symplectic and Multisymplectic Srtuctures and their Discrete Versions
  in Lagrangian Formalism

abstract:
  We introduce the Euler-Lagrange cohomology to study the symplectic and
multisymplectic structures and their preserving properties in finite and
infinite dimensional Lagrangian systems respectively. We also explore their
certain difference discrete counterparts in the relevant regularly discretized
finite and infinite dimensional Lagrangian systems by means of the difference
discrete variational principle with the difference being regarded as an entire
geometric object and the noncommutative differential calculus on regular
lattice. In order to show that in all these cases the symplectic and
multisymplectic preserving properties do not necessarily depend on the relevant
Euler-Lagrange equations, the Euler-Lagrange cohomological concepts and content
in the configuration space are employed.


title: Rescattering corrections in elastic scattering

abstract:
  A detailed study of the rescattering series is performed within a model,
using a generalized procedure of eikonalization and fitted to the $pp$ and
$\bar pp$ elastic scattering data. We estimate and compare the various
rescattering corrections to be added to the Born contribution in the amplitude.
We find that their number is finite, whereas it increases with the energy and
the transfer, like does their importance. In the domain where data exist, we
find also that a correct computation must include, at least, all two- and
three-Reggeon exchanges and some four- and five-Reggeon exchanges. Any
approximation aiming to reduce this (large) number of exchange would be
hazardous, especially when extrapolating. We extend our estimates in the domain
of future experiments.


title:
Absolute determination of D_s branching ratios and f_{D_s} extraction at
  a neutrino factory

abstract:
  A method for a direct measurement of the exclusive D_s branching ratios and
of the decay constant f_{D_s} with a systematical error better than 5% is
presented. The approach is based on the peculiar vertex topology of the
anti-neutrino induced diffractive charm events. The statistical accuracy
achievable with a neutrino factory is estimated.


title: Photon production by a quark gluon plasma

abstract:
  In this talk, I review the status of the calculation of the photon production
rate in a hot quark-gluon plasma. Particular emphasis is given to the
discussion of the various length scales of the problem.


title: Poincare' invariance and the heavy-quark potential

abstract:
  We derive and discuss the constraints induced by Poincare' invariance on the
form of the heavy-quark potential up to order 1/m^2. We present two
derivations: one uses general arguments directly based on the Poincare' algebra
and the other follows from an explicit calculation on the expression of the
potential in terms of Wilson loops. We confirm relations from the literature,
but also clarify the origin of a long-standing false statement pointed out
recently.


title: A Microscopic View of Parton $k_T$ Effects In High $p_T$ Processes

abstract:
  A microscopic mechanism is proposed for understanding the rather large $k_T$
effects ($<k_T>$ = $1-1.5 GeV/c$, as yet unaccounted for by hard QCD), found by
the Fermilab E706 Collaboration for 530 and 800 GeV/c protons incident on light
nuclear targets (mass $A$) like Be. The essential idea is that such high
incident projectile momenta tend to break up the confinement barriers for the
quark-partons residing in the individual nucleonic constituents of the target
nucleus that fall in a tube-like zone around the projectile's path, so that
these particles tend to behave as a collection of quark-partons confronting the
beam. Using simple combinatorial principles, the resultant $<k_T>^2$ value
works out as $(3A_{eff}-1) \beta^2$, where $A_{eff}$ is the number of affected
nucleons in the tube-like zone, and $\beta$ is a scale parameter derived from
the basic quark-pair interaction. Using the previously found results of a
Bethe-Salpeter model (attuned to $q{\bar q}$ and $qqq$ spectroscopy), one in
which a key ingredient is the infrared part of the gluon propagator, giving
$\beta^2= 0.068 GeV^2$, the desired $<k_T>$ range is reproduced, suggesting the
persistence of $soft$ QCD effects even at high $p_T$. Keywords: Direct photon;
high-$p_T$ reaction; parton $k_T$ distribution; soft-QCD effect.


title:
Evidence for the flavor singlet axial anomaly related effects in $\phi$
  meson electromagnetic production at large momentum transfers

abstract:
  The gluonic contributions to the conventional PCAC formulas due to flavor
singlet axial anomaly have been instrumental in explaining the mass of the
$\eta^{\prime}$ and providing a plausible explanation for solving the spin
crisis. We show that they also play an important role in the description of
photo- and electroproduction of vector mesons at low energy and high momentum
transfers. We calculate the contributions of this type to $\phi$ meson
electromagnetic production in a model, which contains also a soft pomeron, and
find agreement with recent CLAS data.


title: J/psi Suppression and Enhancement in Au+Au Collisions at the BNL RHIC

abstract:
  We consider the production of the J/psi mesons in heavy ion collisions at
RHIC energies in the statistical coalescence model with an exact (canonical
ensemble) charm conservation. The c\bar{c} quark pairs are assumed to be
created in the primary hard parton collisions, but the formation of the open
and hidden charm particles takes place at the hadronization stage and follows
the prescription of statistical mechanics. The dependence of the J/psi
production on both the number of nucleon participants and the collision energy
is studied. The model predicts the J/psi suppression for low energies, whereas
at the highest RHIC energy the model reveals the J/psi enhancement.


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

abstract:
  We study the kinetic equilibration of gluons produced in the very early
stages of a high energy heavy ion collision in a ``self-consistent'' relaxation
time approximation. We compare two scenarios describing the initial state of
the gluon system, namely the saturation and the minijet scenarios, both at RHIC
and LHC energies. We argue that, in order to characterize kinetic
equilibration, it is relevant to test the isotropy of various observables. As a
consequence, we find in particular that in both scenarios elastic processes are
not sufficient for the system to reach kinetic equilibrium at RHIC energies.
More generally, we show that, contrary to what is often assumed in the
literature, elastic collisions alone are not sufficient to rapidly achieve
kinetic equilibration. Because of longitudinal expansion at early times, the
actual equilibration time is at least of the order of a few fermis.


title: Opening the Crystalline Color Superconductivity Window

abstract:
  Cold dense quark matter is in a crystalline color superconducting phase
wherever pairing occurs between species of quarks with chemical potentials
whose difference \delta\mu lies within an appropriate window. If the
interaction between quarks is modeled as point-like, this window is rather
narrow. We show that when the interaction between quarks is modeled as
single-gluon exchange, the window widens by about a factor of ten at accessible
densities and by much larger factors at higher density. This striking
enhancement reflects the increasingly (1+1)-dimensional nature of the physics
at weaker and weaker coupling. Our results indicate that crystalline color
superconductivity is a generic feature of the phase diagram of cold dense quark
matter, occurring wherever one finds quark matter which is not in the
color-flavor locked phase. If it occurs within the cores of compact stars, a
crystalline color superconducting region may provide a new locus for glitch
phenomena.


title: Radion effects on unitarity in gauge-boson scattering

abstract:
  The scalar field associated with fluctuations in the positions of the two
branes, the ``radion'', plays an important role determining the cosmology and
collider phenomenology of the Randall-Sundrum solution to the hierarchy
problem. It is now well known that the radion mass is of order the weak scale,
and that its couplings to standard model fields are order 1/TeV to the trace of
the energy momentum tensor. We calculate longitudinal vector boson scattering
amplitudes to explore the constraints on the radion mass and its coupling from
perturbative unitarity. The scattering cross section can indeed become
non-perturbative at energies prior to reaching the TeV brane cutoff scale, but
only when some curvature-Higgs mixing on the TeV brane is present. We show that
the coefficient of the curvature-Higgs mixing operator must be less than about
3 for the 4-d effective theory to respect perturbative unitarity up to the TeV
brane cutoff scale. Mass bounds on the Higgs boson and the radion are also
discussed.


title: A simple out-of-equilibrium field theory formalism ?

abstract:
  In this paper, we determine a condition of applicability of a very simple
formalism for the calculation of a fast process taking place in a
non-equilibrium medium, in which the particle distribution functions are frozen
in time.
  Indeed, a well known obstacle for the use of such a naive formalism is the
appearance of the so-called ``pinch singularities''. We argue that these
potentially dangerous terms can be regularized, and that they are negligible if
the characteristic time-scale of the process under study is small compared to
the relaxation time of the system.


title: Determining See-Saw Parameters from Weak Scale Measurements?

abstract:
  The see-saw mechanism is a very attractive explanation for small neutrino
masses, parametrized at the GUT scale by the right-handed Majorana mass matrix,
${\cal M}$, and the neutrino Yukawa matrix, ${\bf Y_\nu}$. We show that in a
SUSY model with universal soft terms, ${\cal M}$ and ${\bf Y_\nu}$ can be
calculated from the light neutrino masses, the MNS matrix, and ${\bf
Y^{\dagger}_\nu} {\bf Y_\nu}$, which enters into the left-handed slepton
radiative corrections. This suggests that in principle the GUT-scale inputs of
the seesaw could be reconstructed from the neutrino and sneutrino mass
matrices. We briefly discuss why this is impractical, but advocate the neutrino
and sneutrino mass matrices as an alternative bottom-up parametrization of the
seesaw.


title: Vacuum Polarisation Tensors in Constant Electromagnetic Fields: Part III

abstract:
  The string-inspired technique is used for a first calculation of the one-loop
axialvector vacuum polarisation in a general constant electromagnetic field. A
compact result is reached for the difference between this tensor and the
corresponding vector vacuum polarisation. This result is confirmed by a Feynman
diagram calculation. Its physical relevance is briefly discussed.


title: Semi-leptonic B-decays and the two-pion distribution amplitudes

abstract:
  We show that the semi-leptonic decay B+ -> pi+ pi- l+ \nu_l can be used as a
source of information for two-pion distribution amplitudes. The connection
between these amplitudes and the B-meson decay width is achieved by the light
cone sum rule method. We show the relevant distribution amplitudes and give the
formula for the decay width.


title: Theoretical correction to the neutral $B^0$ meson asymmetry

abstract:
  Certain types of asymmetries in neutral meson physics have not been treated
properly, ignoring the difference of normalization factors with an assumption
of the equality of total decay width. Since the corrected asymmetries in $B^0$
meson are different from known asymmetries by a shift in the first order of CP-
and CPT-violation parameters, experimental data should be analyzed with the
consideration of this effect as in $K^0$ meson physics.


title: Width difference of the B_s mesons from lattice QCD

abstract:
  We extend our previous studies to calculate the B meson B parameters B_B and
B_S on the lattice, and present an update of the results for the B_s meson
width difference. We perform an extensive study of systematic errors in the
quenched calculation of the B-parameters, and find that the systematic errors
are in good control using the NRQCD action for heavy quark. We also report our
preliminary results from unquenched simulations.


title:
Analysis of the nature of the $\phi\to\gamma\pi\eta$ and
  $\phi\to\gamma\pi^0\pi^0$ decays

abstract:
  hep-ph/0104081 was put by accident insdead of "replace hep-ph/0101024"(v2).
We apologize very much.


title: Treatment of the QCD coupling in high energy processes

abstract:
  The treatment of the running QCD coupling in evolution equations is
discussed. It is shown that the use of the virtuality of ladder (vertical)
partons as the scale for QCD coupling in every rung of ladder graphs is an
approximation that holds for DIS at large x only. On the contrary, in the small
x region the coupling depends on the virtuality of s -channel (horizontal)
gluons. This observation leads to different results for the Regge-like
processes and DIS structure functions at small x.


title: Curvature perturbation at the local extremum of the inflaton's potential

abstract:
  The spectrum of curvature perturbation generated during inflation is studied
in the case the inflation-driving scalar field (inflaton) $\phi$ crosses over
its potential extremum. It is shown that the nondecaying mode of perturbation
has a finite value and a proper formula is given. The result is also extended
to more general cases where $\ddot{\phi}$ is non-negligible.


title:
The coupling constant g$_{\rho\sigma\gamma}$ as derived from QCD sum
  rules

abstract:
  We employ QCD sum rules to calculate the coupling constant
g$_{\rho\sigma\gamma}$ by studying the three point
${\rho\sigma\gamma}$-correlation function. Our results is consistent with the
value of this coupling constant obtained using vector meson dominance of the
electromagnetic current and the experimental $\rho^0$-photoproduction data.


title: Statistical Analysis of Solar Neutrino Data

abstract:
  We estimate with Monte Carlo the goodness of fit and the confidence level of
the standard allowed regions for the neutrino oscillation parameters obtained
from the fit of solar neutrino data. We calculate allowed regions with correct
frequentist coverage using the Crow-Gardner prescription of smallest acceptance
intervals. We present also the results of a calculation of Bayesian allowed
regions with a flat prior in the log(tan^2 theta)-log(Delta m^2) plane.


title:
Testing the AMSB Model via $e^+e^- \to \tilde{\chi}^+ \tilde{\chi}^-
  \gamma$}

abstract:
  The possibility of detecting the signature of a nearly invisible charged wino
($\CH$) decaying into a soft pion and the LSP($\LSP$), predicted by the Anomaly
Mediated Symmetry Breaking model, via the process
$e^+e^-\r\gamma{\tilde\chi}^{+}{\tilde\chi}^{-}$ at the Next Linear Collider
has been explored. Using the recently, proposed bounds on slepton and wino
masses derived from the condition of stability of the electroweak symmetry
breaking vacuum and employing some standared kinematical cuts to supress the
background, we find that almost the whole of the allowed parameter space with
the slepton mass less than 1 TeV, can be probed at $\sqrt{s}$ 500 GeV.
Determination of the slepton and the chargino masses from this signal is a
distinct possiblity. Any violation of the above mass bound will suggest that
the standard vacuum is unstable and we are living in a false vacuum.


title: Comment on Intrinsic and dynamically generated scalar meson states

abstract:
  The scalar-meson assignments of Shakin and Wang in a generalized
Nambu--Jona-Lasinio model are contradicted by recent experimental information.
Also the strict distinction made by these authors between ``intrinsic'' and
``dynamically generated'' states is contested, as well as a number of other
statements.


title: Precision test of a Fermion mass texture

abstract:
  Texture zeros in the quark Yukawa matrices generally lead to precise and
simple expressions for CKM matrix elements in terms of ratios of quark masses.
Using the new data on $b-$decays we test a particularly promising texture zero
solution and show that it is at best approximate. We analyse the approximate
texture zero structure and show it is consistent with experiment. We
investigate the implications for the CKM unitarity triangle, measurements at
$BaBar$ and $BELLE$ as well as for the theories which invoke family symmetries.


title: Global U(1) Invariance and Mass Scales in Supersymmetry

abstract:
  In a supersymmetric theory with global U(1) invariance, the spontaneous
breaking of the latter without the breaking of supersymmetry is revisited in
the case of the most general superpotential of 3 singlet superfields. The
interesting possibility of having 2 hierarchical mass scales is pointed out,
together with its consequences as applied to the axionic solution of the strong
CP problem.


title:
Charmless B -> VV Decays in QCD Factorization: Implications of Recent
  $B\to \phi K^*$ Measurement

abstract:
  In the heavy quark limit, both vector mesons in the charmless B -> VV decay
should have zero helicity and the corresponding amplitude is proportional to
the form factor difference $(A_1-A_2)$. The first observed charmless $B\to VV$
mode, $B\to\phi K^*$, indicates that the form factors $A_1(q^2)$ and $A_2(q^2)$
cannot be very similar at low $q^2$ as shown in some form-factor models. The
approach of QCD-improved factorization implies that the nonfactorizable
correction to each partial-wave or helicity amplitude is not the same; the
effective parameters $a_i$ vary for different helicity amplitudes. The
leading-twist nonfactorizable corrections to the transversely polarized
amplitudes vanish in the chiral limit and hence it is necessary to take into
account twist-3 distribution amplitudes of the vector meson in order to have
renormalization scale and scheme independent predictions. Branching ratios of
$B\to VV$ decays are calculated in two different models for form factors, and
the predicted decay rates are different by a factor of $1.5\sim 2$. Owing to
the absence of (S-P)(S+P) penguin contributions to the W-emission amplitudes,
tree-dominated decays tend to have larger branching ratios than the
penguin-dominated ones.


title:
Phenomenology of Non-Abelian Flat Directions in a Minimal Superstring
  Standard Model

abstract:
  Recently, we presented the first non-Abelian flat directions that produce
from a heterotic string model solely the three-generation MSSM states as the
massless spectrum in the observable sector of the low energy effective field
theory. In this paper we continue to develop the systematic techniques for the
analysis of nonrenormalizable superpotential terms and non-Abelian flat
direction in realistic string models. Some of our non-Abelian directions were
F-flat to all finite orders in the superpotential. We study for the same string
model the varying phenomenologies resulting from a large set of such all-order
flat directions. We focus on the quark, charged lepton, and Higgs doublet mass
matrices resulting for our phenomenologically superior non-Abelian flat
direction. We review and apply a string-related method for generating large
mass hierarchies between MSSM generations, first discussed in string-derived
flipped SU(5) models, when all generational mass terms are of renormalizable or
very low non-renormalizable order.


title: Implications of maximal Jarlskog invariant and maximal CP violation

abstract:
  We argue here why CP violating phase Phi in the quark mixing matrix is
maximal, that is, Phi=90 degrees. In the Standard Model CP violation is related
to the Jarlskog invariant J, which can be obtained from non commuting Hermitian
mass matrices. In this article we derive the conditions to have Hermitian mass
matrices which give maximal Jarlskog invariant J and maximal CP violating phase
Phi. We find that all squared moduli of the quark mixing elements have a
singular point when the CP violation phase Phi takes the value Phi=90 degrees.
This special feature of the Jarlskog invariant J and the quark mixing matrix is
a clear and precise indication that CP violating Phase Phi is maximal in order
to let nature treat democratically all of the quark mixing matrix moduli.


title:
Diffractive beauty photoproduction as a short distance probe of QCD
  pomeron

abstract:
  High-energy open beauty photoproduction probes the vacuum exchange at
distances $\sim 1/m_b$ and detects significant corrections to the BFKL
asymptotics coming from the subleading vacuum poles. We show that the interplay
of leading and subleading vacuum exchanges gives rise to the cross section
$\sigma^{b\bar b}(W)$ growing much faster than it is prescribed by the exchange
of the leading pomeron trajectory with intercept
$\alpha_{\Pom}(0)-1=\Delta_{\Pom}=0.4$. Our calculations within the color
dipole BFKL model are in agreement with the recent determination of
$\sigma^{b\bar b}(W)$ by the H1 collaboration. The comparative analysis of
diffractive photoproduction of beauty, charm and light quarks exhibits the
hierarchy of pre-asymptotic pomeron intercepts which follows the hierarchy of
corresponding hardness scales. We comment on the phenomenon of decoupling of
soft and subleading BFKL singularities at the scale of elastic
$\Upsilon(1S)$-photoproduction which results in precocious color dipole BFKL
asymptotics of the process $\gamma p \to \Upsilon p$.


title: Supernova Constraints on Neutrino Mass and Mixing

abstract:
  In this article I review the constraints on neutrino mass and mixing coming
from type-II supernovae. The bounds obtained on these parameters from shock
reheating, r-process nucleosynthesis and from SN1987A are discussed. Given the
current constraints on neutrino mass and mixing the effect of oscillations of
neutrinos from a nearby supernova explosion in future detectors will also be
discussed.


title: Earth Regeneration of Solar Neutrinos at SNO and Super-Kamiokande

abstract:
  We analyze the 1258-day Super-Kamiokande day and night solar neutrino energy
spectra with various $\chi^2$ definitions. The best-fit lies in the LMA region
at $(\Delta m^2, tan^2 \theta)=(5.01\times 10^{-5} eV^2, 0.60)$, independently
of whether systematic errors are included in the $\chi^2$-definition. We
compare the exclusion and allowed regions from the different definitions and
choose the most suitable definition to predict the regions from SNO at the end
of three years of data accumulation. We first work under the assumption that
Super-Kamiokande sees a flux-suppressed flat energy spectrum. Then, we consider
the possibility of each one of the three MSW regions being the solution to the
solar neutrino problem. We find that the exclusion and allowed regions for the
flat spectrum hypothesis and the LMA and LOW solutions are alike. In three
years, we expect SNO to find very similar regions to that obtained by
Super-Kamiokande. We evaluate whether the zenith angle distribution at SNO with
optimum binning will add anything to the analysis of the day and night spectra;
for comparison, we show the results of our analysis of the 1258-day zenith
angle distribution from Super-Kamiokande, for which the best-fit parameters are
$(\Delta m^2, tan^2 \theta)=(5.01\times 10^{-5} eV^2, 0.56)$.


title:
Next-to-leading order QCD corrections to top quark spin correlations at
  hadron colliders: the reactions $g g \to t {\bar t} (g)$ and $g q ({\bar q})
  \to t {\bar t} q ({\bar q})$

abstract:
  We have computed the cross section for $t\bar t$ production by gluon-gluon
fusion at next-to-leading order (NLO) in the QCD coupling, keeping the full
dependence on the $t\bar t$ spins. Furthermore we have determined to the same
order the spin dependent cross sections for the processes $g + q ({\bar q})\to
t {\bar t} + q ({\bar q})$. Together with our previous results for $q + {\bar
q} \to t {\bar t} (g)$ these results allow for predictions, at NLO QCD, of the
hadronic production of $t\bar t$ pairs in a general spin configuration. As an
application we have determined the degree of correlation of the $t$ and $\bar
t$ spins at NLO, using various spin quantisation axes.


title: Freezing of QCD coupling affects the short distance static potential

abstract:
  A striking contradiction between lattice short range static potential (nf=0)
and standard perturbative potential, observed by Bali G.S., is investigated in
the framework of the background perturbation theory. With the use of the
background coupling which contains the only background parameter - mass mB,
fixed by fine structure fit in bottomonium, the lattice data are nicely
explained without introduction of exotic short range linear potential with
large "string tension" approx. 1 GeV squared. A significant difference between
the background coupling and standard perturbative coupling is found in the
range 0.05 fm < r<0.15 fm, while at larger distances, r > 0.3 fm the background
coupling fast approaches the freezing value. Some problems concerning the
strong coupling properties at short and long distances are discussed and
solutions are suggested.


title: Conformal window and Landau singularities

abstract:
  A physical characterization of Landau singularities is emphasized, which
should trace the lower boundary N_f^* of the conformal window in QCD and
supersymmetric QCD. A natural way to disentangle ``perturbative'' from
  ``non-perturbative'' contributions below N_f^* is suggested. Assuming an
infrared fixed point is present in the perturbative part of the QCD coupling
even in some range below N_f^* leads to the condition gamma(N_f^*)=1, where
gamma is the critical exponent. This result is incompatible with the existence
of an analogue of Seiberg free dual magnetic phase in QCD. Using the Banks-Zaks
expansion, one gets
  4<N_f^*<6. The low value of N_f^* gives some justification to the infrared
finite coupling approach to power corrections, and suggests a way to compute
their normalization from perturbative input. If the perturbative series are
still asymptotic in the negative coupling region, the presence of a negative
ultraviolet fixed point is required both in QCD and in supersymmetric QCD to
preserve causality within the conformal window. Some evidence for such a fixed
point in QCD is provided through a modified Banks-Zaks expansion. Conformal
window amplitudes, which contain power contributions, are shown to remain
generically finite in the N_f=-\infty one-loop limit in simple models with
infrared finite perturbative coupling.


title: On the Anomalous Dimension of the Transversity Distribution $h_1(x,Q^2)$

abstract:
  We calculate the leading order anomalous dimension of the transversity
structure function directly using three different methods, the local light-cone
expansion in the forward case, the non-forward case, and the short-distance
expansion of the forward Compton amplitude. Our results agree with the original
calculation by Artru and Mekhfi [Z. Phys. {\bf 45} (1990) 669], which has been
doubted recently. We also comment on the next-to-leading order anomalous
dimension.


title: On the gravitational production of superheavy dark matter

abstract:
  The dark matter in the universe can be in the form of a superheavy matter
species (WIMPZILLA). Several mechanisms have been proposed for the production
of WIMPZILLA particles during or immediately following the inflationary epoch.
Perhaps the most attractive mechanism is through gravitational particle
production, where particles are produced simply as a result of the expansion of
the universe. In this paper we present a detailed numerical calculation of
WIMPZILLA gravitational production in hybrid-inflation models and
natural-inflation models. Generalizing these findings, we also explore the
dependence of the gravitational production mechanism on various models of
inflation. We show that superheavy dark matter production seems to be robust,
with Omega_X h^2 ~ (M_X / (10^11 GeV))^2 (T_RH / (10^9 GeV)), so long as M_X <
H_I, where M_X is the WIMPZILLA mass, T_RH is the reheat temperature, and H_I
is the expansion rate of the universe during inflation.


title: Signals of Supersymmetric Flavour Models in B Physics

abstract:
  If the mechanism of Supersymmetry breaking is not flavour blind, some flavour
symmetry is likely to be needed to prevent excessive flavour changing neutral
current effects. We discuss two flavour models (based respectively on a U(2)
and on a SU(3) horizontal symmetry) providing a good fit to fermion masses and
mixings and particularly constraining the supersymmetry soft breaking terms. We
show that, while reproducing successfully the Standard Model fit of the
unitarity triangle, it is possible to obtain sizable deviations from the
Standard Model predictions for three very clean B-physics observables: the time
dependent CP asymmetries in $B_d \to J/\psi K^0$ and in $B_s \to J/\psi \phi$
and the $B_s-\bar{B}_s$ mass difference. Our analysis exhibits with two
explicit realizations that in supersymmetric theories with a new flavour
structure in addition to the Yukawa matrices there exist concrete
potentialities for revealing supersymmetry indirectly in theoretically clean
$B$-physics observables.


title:
Effects of Flavor-dependent $q\bar{q}$ Annihilation on the Mixing Angle
  of the Isoscalar Octet-Singlet and Schwinger's Nonet Mass Formula

abstract:
  By incorporating the flavor-dependent quark-antiquark annihilation amplitude
into the mass-squared matrix describing the mixing of the isoscalar states of a
meson nonet, the new version of Schwinger's nonet mass formula which holds with
a high accuracy for the $0^{-+}$, $1^{--}$, $2^{++}$, $2^{-+}$ and $3^{--}$
nonets is derived and the mixing angle of isoscalar octet-singlet for these
nonets is obtained. In particular, the mixing angle of isoscalar octet-singlet
for pseudoscalar nonet is determined to take the value of $-12.92^\circ$, which
is in agreement with the value of $-13^\circ\sim-17^\circ$ deduced from a
rather exhaustive and up-to-date analysis of data. It is also pointed out that
the omission of the flavor-dependent $q\bar{q}$ annihilation effect might be a
factor resulting in the invalidity of Schwinger's original nonet mass formula
for pseudoscalar nonet.


title: Splitting Triplet and Doublet in Extra Dimensions

abstract:
  A novel mechanism to realize the triplet-doublet splitting in supersymmetric
SU(5) grand unified theories is proposed in the framework of higher dimensional
theories where chiral multiplets are localized due to kink configuration of a
SU(5) singlet. An adjoint Higgs field which spontaneously breaks the SU(5)
gauge symmetry is assumed to be involved with the localization process,
splitting the wave functions of the color-triplet Higgs from its doublet
counterpart. The resulting effective four-dimensional theory does not possess
manifest SU(5) invariance. By adjusting couplings, the doublet mass can be
exponentially suppressed. We also show that dimension 5 proton decay from
triplet Higgs exchange can be suppressed to a negligible level.


title: Lepton Flavor Violating Z Decays in the Zee Model

abstract:
  We calculate lepton flavor violating (LFV) Z decays Z \to {{e_i^\pm}}e_j^\mp
(i, j = e, \mu, \tau ; i\neq j) in the Zee model keeping in view the radiative
leptonic decays e_i\to e_j\gamma (i = \mu, \tau ; j = e, \mu ; i\neq j), \mu
decay and anomalous muon magnetic moment (\mu AMM). We investigate three
different cases of Zee f_{ij} coupling (A) f_{e\mu}^2 = f_{\mu\tau}^2= f_{\tau
e}^2, (B) f_{e\mu}^2 \gg f_{\tau e}^2 \gg f_{\mu\tau}^2, and (C) f_{\mu\tau}^2
\gg f_{e\mu}^2 \gg f_{\tau e}^2 subject to the neutrino phenomenology.
Interestingly, we find that, although the case (C) satisfies the large excess
value of \mu AMM, however, it is unable to explain the solar neutrino
experimental result, whereas the case (B) satisfies the bi-maximal neutrino
mixing scenario, but confronts with the result of \mu AMM experiment. We also
find that among all the three cases, only the case (C) gives rise to largest
contribution to the ratio B(Z\to e^\pm\tau^\mp)/B(Z\to \mu^\pm \mu^\mp) \simeq
{10}^{-8} which is still two order less than the accessible value to be probed
by the future linear colliders, whereas for the other two cases, this ratio is
too low to be observed even in the near future for all possible LFV Z decay
modes.


title:
Probing Anomalous Top-Couplings through the Final Lepton Angular and
  Energy Distributions at Polarized NLC

abstract:
  The angular and energy distributions of the final lepton in e ebar t tbar -->
l^{+-} X at next linear colliders (NLC) are analyzed a model-independent way
for arbitrary longitudinal beam polarizations as sensitive tests of possible
anomalous top-quark couplings. The angular-energy distribution is expressed as
a combination of independent functions of the angle and the energy, where each
anomalous parameter is the coefficient of an individual term. Every parameter
could be thereby determined simultaneously via the optimal-observable
procedure. On the other hand, anomalous tbW couplings totally decouple from the
angular distribution, which enables us to study t-tbar-gamma/Z couplings
exclusively.


title: The reach of a future Linear Collider after the g-2 result

abstract:
  Combining the cosmological requirement on dark matter with the recent BNL g-2
measurement it is argued that, within the mSUGRA framework, the preferred
region for SUSY mass parameters falls well inside the area covered by the
future linear colliders under consideration for right handed sleptons and of
the 2 lightest neutralinos. The coverage for the lightest chargino and left
handed sleptons is also favoured but with smaller confidence.


title: Contact Interactions, Large Extra Dimensions and Leptoquarks at THERA

abstract:
  The sensitivity of THERA to different models of "new physics" has been
studied, both for the contact interaction approximation and for the resonance
production. For contact interaction models conserving parity, scales up to
about 18 TeV can be explored at THERA, extending considerably beyond the
existing bounds. Significant improvement of existing limits is also expected
for models with large extra dimensions. Effective Plank mass scales up to about
2.8 TeV can be probed. THERA will be the best machine to study leptoquark
properties, for leptoquark masses up to about 1 TeV. It will be sensitive to
the leptoquark Yukawa couplings down to lambda ~ 0.01.


title:
Parton densities and saturation scale from non-linear evolution in DIS
  on nuclei

abstract:
  We present the numerical solution of the non-linear evolution equation for
DIS on nuclei for $x = 10^{-2} \div 10^{-7}$. We demonstrate that the solution
to the non-linear evolution equation is quite different from the Glauber -
Mueller formula which was used as the initial condition for the equation.
  We illustrate the energy profit for performing DIS experiments on nuclei.
  However, it turns out that the gain is quite modest: $x_{Au} \simeq 5 x_{\rm
proton} $ for the same parton density.
  We find that the saturation scale $Q^2_s \propto A^{{1/3}}$. For gold the
saturation scale $Q_{s,Au} \simeq 1.5 GeV$ at $x= 10^{-3}$. Such a large value
leads to considerable contribution of the high density QCD phase to RHIC data
and reveals itself in essential damping for both $xG_A$ and $F_{2A}$.


title:
One-loop corrections to the chargino and neutralino mass matrices in the
  on-shell scheme

abstract:
  We present a consistent procedure for the calculation of the one-loop
corrections to the charginos and neutralinos by using their on-shell mass
matrices. The on-shell gaugino mass parameters M and M', and the Higgsino mass
parameter \mu are defined by the elements of these on-shell mass matrices. The
on-shell mass matrices are different by finite one-loop corrections from the
tree-level ones given in terms of the on-shell parameters. When the on-shell M
and \mu are determined by the chargino sector, the neutralino masses receive
corrections up to 4%. This must be taken into account in precision measurements
at future e^+ e^- linear colliders.


title:
QCD Factorization in B -> pi K, pi pi Decays and Extraction of
  Wolfenstein Parameters

abstract:
  In the heavy-quark limit, the hadronic matrix elements entering nonleptonic
$B$-meson decays into two light mesons can be calculated from first principles
including ``nonfactorizable'' strong-interaction corrections. The $B\to\pi
K,\pi\pi$ decay amplitudes are computed including electroweak penguin
contributions, SU(3) violation in the light-cone distribution amplitudes, and
an estimate of power corrections from chirally-enhanced terms and annihilation
graphs. The results are then used to reduce the theoretical uncertainties in
determinations of the weak phases $\gamma$ and $\alpha$. In that way, new
constraints in the $(\bar\rho,\bar\eta)$ plane are derived. Predictions for the
$B\to\pi K, \pi\pi$ branching ratios and CP asymmetries are also presented. A
good global fit to the (in part preliminary) experimental data on the branching
fractions is obtained without taking recourse to phenomenological models.


title:
On vanishing of the factorizable $c\bar c$ contribution in the radiative
  $B \to K^*\gamma$ decay

abstract:
  We argue that the factorizable $c\bar c$ long- and short-distance
contributions to the $B\to K^*\gamma$ amplitude vanish, separately, if defined
in a gauge-invariant way. Therefore, the $c\bar c$ states contribute to the
radiative decay only through the non-factorizable soft-gluon exchanges.


title: One-loop Higgs mass finiteness in supersymmetric Kaluza-Klein theories

abstract:
  We analyze the one-loop ultraviolet sensitivity of the Higgs mass in a
five-dimensional supersymmetric theory compactified on the orbifold S^1/Z_2,
with superpotential localized on a fixed-point brane. Four-dimensional
supersymmetry is broken by Scherk-Schwarz boundary conditions. Kaluza-Klein
interactions are regularized by means of a brane Gaussian distribution along
the extra dimension with length l_s\simeq\Lambda^{-1}_s, where \Lambda_s is the
cutoff of the five-dimensional theory. The coupling of the n-mode, with mass
M^{(n)}, acquires the n-dependent factor exp{-(M^{(n)}/\Lambda_s)^2/2}, which
makes it to decouple for M^{(n)}\gg \Lambda_s. The sensitivity of the Higgs
mass on \Lambda_s is strongly suppressed and quadratic divergences cancel by
supersymmetry. The one-loop correction to the Higgs mass is finite and equals,
for large values of \Lambda_s, the value obtained by the so-called
KK-regularization.


title: Solar and atmospheric neutrinos: a solution with large extra dimensions

abstract:
  We have studied [1] flavor neutrinos confined to our four-dimensional world
coupled to one "bulk" state, i.e., a Kaluza-Klein tower. Within a minimal
model, we accomodate existing experimental constraints (CHOOZ experiment, solar
and atmospheric data). No direct flavor oscillations nor MWS effects are
needed. An energy independent suppression is produced at large distances.


title:
Hadronic interactions, precocious unification, and cosmic ray showers at
  Auger energies

abstract:
  At Auger energies only model predictions enable us to extract primary cosmic
ray features. The simulation of the shower evolution depends sensitively on the
first few interactions, necessarily related to the quality of our understanding
of high energy hadronic collisions. Distortions of the standard ``soft
semi-hard'' scenario include novel large compact dimensions and a string or
quantum gravity scale not far above the electroweak scale. Na\"{\i}vely, the
additional degrees of freedom yield unification of all forces in the TeV range.
In this article we study the influence of such precocious unification during
atmospheric cascade developments by analyzing the most relevant observables in
proton induced showers.


title: Chargino and Neutralino Decays Revisited

abstract:
  We perform a comprehensive analysis of the decays of charginos and
neutralinos in the Minimal Supersymmetric Standard Model where the neutralino
$\chi_1^0$ is assumed to be the lightest supersymmetric particle. We focus, in
particular, on the three-body decays of the next-to-lightest neutralino and the
lightest chargino into the lightest neutralino and fermion-antifermion pairs
and include vector boson, Higgs boson and sfermion exchange diagrams, where in
the latter contribution the full mixing in the third generation is included.
The radiative corrections to the heavy fermion and SUSY particle masses will be
also taken into account. We present complete analytical formulae for the Dalitz
densities and the integrated partial decay widths in the massless fermion case,
as well as the expressions of the differential decay widths including the
masses of the final fermions and the polarization of the decaying charginos and
neutralinos. We then discuss these decay modes, in particular in scenarios
where the parameter $\tan \beta$ is large and in models without universal
gaugino masses at the Grand Unification scale where some new decay channels,
such as decays into gluinos and $q\bar{q}$ pairs, open up.