title:
Implication of scalar-pseudoscalar mixing on $\epsilon'/\epsilon$ in
  SUSY models

abstract:
  We study the effects of scalar-pseudoscalar mixing induced from quantum loop
on $\epsilon'/\epsilon$ in SUSY models with $\tan\beta\sim m_{t}/m_{b}$. We
find that even the non-universal soft ${\cal A}^{d}$ term and Yukawa matrix,
$Y^{d}$, are hermitian, the predicted value of $|\epsilon'/\epsilon|$ can be
consistent with the measured results of NA48 and KTeV. And also the EDMs are
compatible with experimental bounds.


title: The pion diffractive dissociation into two jets

abstract:
  The method used and results obtained are described for calculation of the
cross section for the pion diffractive dissociation into two jets. The main new
qualitative result is that the distribution of longitudinal momenta for jets is
not simply proportional to the profile of the pion wave function
  $\phi_{\pi}(x)$, but depends on it in a complicated way. In particular, it is
shown that under conditions of the E791 experiment, the momentum distribution
of jets is similar in its shape for the asymptotic and CZ wave functions. It is
concluded therefore that, unfortunately, the process considered is really
weakly sensitive to the profile of the pion wave function, and the accuracy of
data is insufficient to distinguish clearly between different models of
$\phi_{\pi}(x)$. Comparison with the results of other papers on this subject is
given.


title: Non-equilibrium Hadrochemistry in QGP Hadronization

abstract:
  This survey offers an introductory tutorial for students of any age of the
currently thriving field of hadrochemistry. We discuss the different chemical
potentials, how the hadronic phase space is described and how one evaluates the
abundance of hadrons at time of hadronization. We show that a rather accurate
description of experimental data arises and we present results of fits to
hadron yields at SPS and RHIC. We show that introduction of chemical
non-equilibrium originating in a sudden hadronization of a QGP is favored
strongly at SPS and is presently also emerging at RHIC. The low chemical
freeze-out temperatures are consistent with the picture of single freeze-out
scenario (chemical and thermal freeze-out coincide).


title:
A renormalisation group approach to two-body scattering in the presence
  of long-range forces

abstract:
  We apply renormalisation-group methods to two-body scattering by a
combination of known long-range and unknown short-range potentials. We impose a
cut-off in the basis of distorted waves of the long-range potential and
identify possible fixed points of the short-range potential as this cut-off is
lowered to zero. The expansions around these fixed points define the power
countings for the corresponding effective field theories. Expansions around
nontrivial fixed points are shown to correspond to distorted-wave versions of
the effective-range expansion. These methods are applied to scattering in the
presence of Coulomb, Yukawa and repulsive inverse-square potentials.


title: Diffractive Higgs production: Soft Colour Interactions perspective

abstract:
  We briefly present the soft colour interaction models which are successful in
reproducing a multitude of diffractive hard scattering data, and give
predictions for diffractive Higgs production at the Tevatron and LHC. Only a
few diffractive Higgs events may be produced at the Tevatron, but we predict a
substantial rate at the LHC.


title: Tau Flavour Violation in Sparticle Decays at the LHC

abstract:
  We consider sparticle decays that violate tau lepton number, motivated by
neutrino oscillation data. We work in the context of the constrained minimal
supersymmetric extension of the Standard Model (CMSSM), in which the different
sleptons have identical masses at the GUT scale, and neutrino Dirac Yukawa
couplings mix them. We find that the branching ratio for decay of the heavier
neutralino chi_2 to chi + tau mu is enhanced when the LSP mass m_chi =
m_stau_1, including the region of CMSSM parameter space where coannihilation
keeps the relic chi density within the range preferred by cosmology. Thus chi_2
to chi + tau mu decay may provide a physics opportunity for observing the
violation of tau lepton number at the LHC that is complementary to tau to mu +
gamma decay. Likewise, chi_2 to chi + e mu decay is also enhanced in the
coannihilation region, providing a complement to mu to e + gamma decay.


title:
Search for Cold Dark Matter and Solar Neutrinos with GENIUS and
  GENIUS-TF

abstract:
  The new project 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 2002.


title: Heavy Triplet Leptons and New Gauge Boson

abstract:
  A heavy triplet of leptons $(\Sigma^+, \Sigma^0, \Sigma^-)_R$ per family is
proposed as the possible anchor of a small seesaw neutrino mass. A new U(1)
gauge symmetry is then also possible, and the associated gauge boson $X$ may be
discovered at or below the TeV scale. We discuss the phenomenology of this
proposal, with and without possible constraints from the NuTeV and atomic
parity violation experiments, which appear to show small discrepancies from the
predictions of the standard model.


title: First Results from the HDMS experiment in the Final Setup

abstract:
  The Heidelberg Dark Matter Search (HDMS) is an experiment designed for the
search for WIMP dark matter. It is using a special configuration of Ge
detectors, to efficiently reduce the background in the low-energy region below
100 keV. After one year of running the HDMS detector prototype in the Gran
Sasso Underground Laboratory, the inner crystal of the detector has been
replaced with a HPGe crystal of enriched $^{73}$Ge. The final setup started
data taking in Gran Sasso in August 2000. The performance and the first results
of the measurement with the final setup are discussed.


title:
Soft-collinear effective theory and heavy-to-light currents beyond
  leading power

abstract:
  An important unresolved question in strong interaction physics concerns the
parameterization of power-suppressed long-distance effects to hard processes
that do not admit an operator product expansion (OPE). Recently Bauer et al.\
have developed an effective field theory framework that allows one to formulate
the problem of soft-collinear factorization in terms of fields and operators.
We extend the formulation of soft-collinear effective theory, previously worked
out to leading order, to second order in a power series in the inverse of the
hard scale. We give the effective Lagrangian and the expansion of ``currents''
that produce collinear particles in heavy quark decay. This is the first step
towards a theory of power corrections to hard processes where the OPE cannot be
used. We apply this framework to heavy-to-light meson transition form factors
at large recoil energy.


title: Cosmological constant and curved 5D geometry

abstract:
  We study the value of cosmological constant in de Sitter brane embedded in
five dimensions with positive, vanishing and negative bulk cosmological
constant. In the case of negative bulk cosmological constant, we show that not
zero but tiny four-dimensional cosmological constant can be realized by tiny
deviation from bulk curvature of the Randall-Sundrum model.


title: D-->PV decays with final state interactions

abstract:
  We employ one-particle-exchange method to study D-->PV decays in D-->K \rho,
\pi K*, \pi \rho processes. Taking into account a strong phase and considering
nonfactorizable effect, we can get good results consistent with the
experimental data. Nonfactorizable effect is not always large, but in some
cases, the nonfactorizable effect is nececcesary to accommodate the
experimental data. Strong phase is approximately SU(3) flavour symmetric.


title:
Non Standard $\eta-\eta^{\prime}$ mixing and the Nonleptonic B and
  $\Lambda_b$ Decays to $\eta$ and $\eta^{\prime}$

abstract:
  Radial mixing in the pseudoscalar $\eta-\eta^{\prime}$ systems can be
generated from hyperfine interactions and annihilation terms. For the
$\eta-\eta^{\prime}$ system we find the effects of radial mixing are
appreciable and seriously affect the decay branching ratios for $B \to
\eta(\eta^{\prime})K(K^*)$, mainly by modifying the $B \to \eta(\eta^{\prime})$
form factors. In particular, the effect of radial mixing in conjunction with
the interference effects among penguin amplitudes can resolve puzzles in the $B
\to \eta(\eta^{\prime}) K$ decays. The decay $\Lambda_b \to \Lambda
\eta(\eta^{\prime})$ on the other hand is dominated by a single amplitude so
that the significant interference effects of B decays are absent here.
Moreover, since no $\Lambda_b \to \eta(\eta^{\prime})$ form factors are
involved here, the effect of radial mixing is essentially negligible. Hence,
unlike the B system, we do not predict a large enhancement of $\Lambda_b \to
\Lambda \eta^{\prime}$ relative to $\Lambda_b \to \Lambda \eta$.


title: Searching for New Physics in Leptonic Decays of Bottomonium

abstract:
  New Physics can show up in various well-known processes already studied in
the Standard Model, in particular by modifying decay rates to some extent. In
this work, I examine leptonic decays of $\Upsilon$ vector resonances of
bottomonium below $B\bar{B}$ production, subsequent to a magnetic dipole
radiative structural transition of the vector resonance yielding a pseudoscalar
continuum state, searching for the existence of a light Higgs-like neutral
boson that would imply a slight but experimentally measurable breaking of
lepton universality.


title: Rapidity Spectra Analysis in Terms of Non Extensive Statistic Approach

abstract:
  We provide description of rapidity spectra of particles produced in p-anti-p
collisions using anomalous diffusion approach to account for their
non-equilibrium character. In particular, we exhibit connection between
multiproduction processes and anomalous diffusion described through the
nonlinear Focker-Planck equation with nonlinearity given by the nonextensivity
parameter q describing the underlying Tsallis q-statistics and demonstrate how
it leads to the Feynman scaling violation in these collisions. The q parameter
obtained this way turns out to be closely connected to parameter 1/k converting
the original poissonian multiplicity distribution to its observed Negative
Binomial form. The inelasticity of reaction has been also calculated and found
to slightly decrease with the increasing energy of reaction.
  Keywords: inelasticity, rapidity spectra, nonextensivity


title: A Heavy-Light Chiral Quark Model

abstract:
  We present a new chiral quark model for mesons involving a heavy and a light
(anti-) quark. The model relates various combinations of a quark - meson
coupling constant and loop integrals to physical quantities. Then, some
quantities may be predicted and some used as input. The extension from other
similar models is that the present model includes the lowest order gluon
condensate of the order (300 MeV)^4 determined by the mass splitting of the 0^-
and the 1^- heavy meson states. Within the model, we find a reasonable
description of parameters such as the decay constants f_B and f_D, the
Isgur-Wise function and the axial vector coupling g_A in chiral perturbation
theory for light and heavy mesons.


title: Off-forward Matrix Elements in Light-front Hamiltonian QCD

abstract:
  We investigate the off-forward matrix element of the light cone vector
operator for a dressed quark state in light-front Hamiltonian perturbation
theory. We obtain the corresponding splitting functions in a straightforward
way. We show that the end point singularity is canceled by the contribution
from the normalization of state. Considering mixing with the gluon operator, we
verify the helicity sum rule in perturbation theory. We show that the quark
mass effects are suppressed in the plus component of the matrix element but in
the transverse component, they are not suppressed. We emphasize that this is a
particularity of the off-forward matrix element and is absent in the forward
case.


title:
Forward-backward asymmetries of lepton pairs in events with a large
  transverse momentum jet at hadron colliders

abstract:
  We discuss forward-backward charge asymmetries for lepton pair production in
association with a large transverse momentum jet at hadron colliders. The
measurement of the lepton charge asymmetry relative to the jet direction
A_{FB}^j gives a new determination of the effective weak mixing angle
sin^2{\theta_{eff}^{lept}(M_Z^2)} with in principle a statistical precision
after cuts of \sim 10^{-3} (8 x 10^{-3}) at LHC (Tevatron), due to the large
cross section of the process with initial gluons. The identification of b jets
also allows for the measurement of the bottom quark Z asymmetry A_{FB}^b at
hadron colliders although with a lower precision than at LEP, the resulting
statistical precision for sin^2{\theta_{eff}^{lept}(M_Z^2)} being \sim 9 x
10^{-4} (2 x 10^{-2} at Tevatron).


title: J^PC Exotic Mesons from the Bethe-Salpeter Equation

abstract:
  Masses for vector 1--, axialvector 1+-, 1++, and exotic-vector 1-+ mesons are
calculated within a quantum field theoretic framework based on the
Dyson-Schwinger equations using a model form of the quark-antiquark interaction
that is separable. The model provides an excellent description of pion and
K-meson observables and the flavor-octet ground-state meson spectrum. With no
adjustments to model parameters, a numerical solution of the Bethe-Salpeter
equation yields two exotic 1-+ mesons with masses of 1439 and 1498 MeV.


title:
Getting the most from the statistical analysis of solar neutrino
  oscillations

abstract:
  (Abridged.) We present a thorough analysis of the current solar neutrino
data, in the context of two-flavor active neutrino oscillations. We aim at
performing an accurate and exhaustive statistical treatment of both the input
and the output information. Concerning the input, we analyze 81 observables,
including the Cl rate, the total Ga rate and its winter-summer difference, the
44 spectrum bins from SK and the 34 spectrum bins from SNO. We carefully
evaluate and propagate the effects of 31 correlated systematic uncertainties,
including 12 SSM input errors, the 8B neutrino energy spectrum uncertainty, as
well as 11 and 7 systematics in SK and SNO, respectively. Concerning the
output, we express the chi-squared analysis results in terms of ``pulls,''
embedding the single contributions to the total chi-squared. It is shown that
the pull method, as compared to the (numerically equivalent) covariance matrix
approach, is not only simpler and more advantageous, but also includes useful
indications about the preferred variations of the neutrino fluxes with respect
to their SSM predictions. Our results confirm the current best-fit solution
(LMA), but also allow, with acceptable statistical significance, other
solutions in the low-mass (LOW) or in the quasi-vacuum oscillation (QVO)
regime, while the small mixing angle (SMA) solution could be recovered only by
ad hoc ``recalibrations'' of several SSM and experimental systematics.


title: Astrophysical and Cosmological Constraints on Neutrino masses

abstract:
  We review some astrophysical and cosmological properties and implications of
neutrino masses and mixing angles. These include: constraints based on the
relic density of neutrinos, limits on their masses and lifetimes, BBN limits on
mass parameters, neutrinos and supernovae, and neutrinos and high energy cosmic
rays.


title: Final State Interactions and Delta S=-1, Delta C=\pm 1 B--decays

abstract:
  The final state interactions (FSI) in Delta S=-1, Delta C=\pm 1, decays of
B-meson are discussed. The rescattering corrections are found to be of order of
15-20%. The strong interaction phase shifts are estimated and their effects on
CP-asymmetry are discussed.


title: Baryon Chiral Dynamics

abstract:
  After contrasting the low energy effective theory for the baryon sector with
one for the Goldstone sector, I use the example of pion nucleon scattering to
discuss some of the progress and open issues in baryon chiral perturbation
theory.


title:
Forward Elastic Scattering of Light on Light,
  \gamma+\gamma\to\gamma+\gamma

abstract:
  The forward elastic scattering of light on light, {\em i.e.,} the reaction
$\gamma+\gamma \to \gamma+\gamma$ in the forward direction, is analyzed
utilizing real analytic amplitudes. We calculate $\rho_{\gamma \gamma}$, the
ratio of the real to the imaginary portion of the forward scattering amplitude,
by fitting the total $\gamma \gamma$ cross section data in the high energy
region $5 GeV \le \sqrt s \le 130 $ GeV, assuming a cross section that rises
asymptotically as $\ln^2 s$. We then compare $\rho_{\gamma\gamma}$ to
$\rho_{nn}$, the ratio of the even portions of the $pp$ and $\pbar p$ forward
scattering amplitudes, as well as to $\rho_{\gamma p}$, the $\rho$ value for
Compton scattering. Within errors, we find that the three $\rho$-values in the
c.m.s. energy region $5 GeV \le \sqrt s \le 130$ GeV are the same, as predicted
by a factorization theorem of Block and Kadailov.


title:
Top-squark searches at the Tevatron in models of low-energy
  supersymmetry breaking

abstract:
  We study the production and decays of top squarks (stops) at the Tevatron
collider in models of low-energy supersymmetry breaking. We consider the case
where the lightest Standard Model (SM) superpartner is a light neutralino that
predominantly decays into a photon and a light gravitino. Considering the
lighter stop to be the next-to-lightest Standard Model superpartner, we analyze
stop signatures associated with jets, photons and missing energy, which lead to
signals naturally larger than the associated SM backgrounds. We consider both
2-body and 3-body decays of the top squarks and show that the reach of the
Tevatron can be significantly larger than that expected within either the
standard supergravity models or models of low-energy supersymmetry breaking in
which the stop is the lightest SM superpartner. For a modest projection of the
final Tevatron luminosity, L = 4 fb-1, stop masses of order 300 GeV are
accessible at the Tevatron collider in both 2-body and 3-body decay modes. We
also consider the production and decay of ten degenerate squarks that are the
supersymmetric partners of the five light quarks. In this case we find that
common squark masses up to 360 GeV are easily accessible at the Tevatron
collider, and that the reach increases further if the gluino is light.


title: Inflationary cosmology from STM theory of gravity

abstract:
  I study the power-law and de Sitter expansions for the universe during
inflation from the STM theory of gravity. In a de Sitter expansion the
additional dimension is related to the cosmological constant. I find from
experimental data that the mass of the inflaton field is $m^2=2/(3\Psi^2)$. In
power-law expansion, the fifth coordinate appears to be a dimensionless
constant. The interesting here is that the $\Psi$-value depends on the initial
conditions. I find the 5D line element for this inflationary expansion, which
is a function of the classical component of the inflaton.


title: Theory of hard photoproduction

abstract:
  The present theoretical knowledge about photons and hard photoproduction
processes, i.e. the production of jets, light and heavy hadrons, quarkonia, and
prompt photons in photon-photon and photon-hadron collisions, is reviewed.
Virtual and polarized photons and prompt photon production in hadron collisions
are also discussed. The most important leading and next-to-leading order QCD
results are compiled in analytic form. A large variety of numerical predictions
is compared to data from TRISTAN, LEP, and HERA and extended to future electron
and muon colliders. The sources of all relevant results are collected in a rich
bibliography.


title: Re-analysis of the $D^* D\pi$ coupling in the light-cone QCD sum rules

abstract:
  The recent measurement from the CLEO experiment presents the $DD^*\pi$
coupling, $17.9\pm 0.3 \pm 1.9$. This value is much larger than any of QCD sum
rule predictions available in literature. We report that, with a relevant
treatment of the continuum subtraction as well as with the asymptotic form of
the twist-2 pion wave function, the light-cone QCD sum rule can provide the
coupling comparable to the experimental value. The stability of the resulting
sum rule becomes much better with these corrections.


title: B0-B0bar mixing

abstract:
  The subject of particle-antiparticle mixing in the neutral B meson systems is
reviewed. The formalism of B0-B0bar mixing and basic Standard Model predictions
are given, before experimental issues are discussed and the latest combinations
of experimental results on mixing parameters are presented, including those on
mixing-induced CP violation, mass differences, and decay-width differences.
Finally, time-integrated mixing results are used to improve our knowledge on
the fractions of the various b-hadron species produced at high energy
colliders.


title:
Benchmarks for the Forward Observables at RHIC, the Tevatron-run II and
  the LHC

abstract:
  We present predictions on the total cross sections and on the ratio of the
real part to the imaginary part of the elastic amplitude (rho parameter) for
present and future pp and pbar p colliders, and on total cross sections for
gamma p -> hadrons at cosmic-ray energies and for gamma gamma-> hadrons up to
sqrt{s}=1 TeV. These predictions are based on an extensive study of possible
analytic parametrisations invoking the biggest hadronic dataset available at
t=0. The uncertainties on total cross sections, including the systematic errors
due to contradictory data points from FNAL, can reach 1.9% at RHIC, 3.1% at the
Tevatron, and 4.8% at the LHC, whereas those on the rho parameter are
respectively 5.4%, 5.2%, and 5.4%.


title:
Strangeness production in heavy ion collisions at SPS and RHIC within
  two-source statistical model

abstract:
  The experimental data on hadron yields and ratios in central Pb+Pb and Au+Au
collisions at SPS and RHIC energies, respectively, are analysed within a
two-source statistical model of an ideal hadron gas. These two sources
represent the expanding system of colliding heavy ions, where the hot central
fireball is embedded in a larger but cooler fireball. The volume of the central
source increases with rising bombarding energy. Results of the two-source model
fit to RHIC experimental data at midrapidity coincide with the results of the
one-source thermal model fit, indicating the formation of an extended fireball,
which is three times larger than the corresponding core at SPS.


title: Leptogenesis and the Violation of Lepton Number and CP at Low Energies

abstract:
  In the context of the minimal supersymmetric seesaw model, we study the
implications of the current neutrino data for thermal leptogenesis,
$\beta\beta_{0\nu}$ decay, and leptonic flavour- and CP-violating low-energy
observables. We express the heavy singlet-neutrino Dirac Yukawa couplings
$(Y_\nu)_{ij}$ and Majorana masses $M_{N_i}$ in terms of the light-neutrino
observables and an auxiliary hermitian matrix $H$, which enables us to scan
systematically over the allowed parameter space. If the lightest heavy neutrino
$N_1$ decays induce the baryon asymmetry, there are correlations between the
$M_{N_1}$, the lightest active neutrino mass and the primordial lepton
asymmetry $\epsilon_1$ on the one hand, and the $\beta\beta_{0\nu}$ decay
parameter $m_{ee}$ on the other hand. {\it However, leptogenesis is insensitive
to the neutrino oscillation phase}. We find lower bounds $M_{N_1}\gsim 10^{10}$
GeV for the normal light-neutrino mass hierarchy, and $M_{N_1}\gsim 10^{11}$
GeV for the inverted mass hierarchy, respectively, indicating a potentially
serious conflict with the gravitino problem. Depending on $M_{N_1}$, we find
upper (upper and lower bounds) on the lightest active neutrino mass for the
normal (inverted) mass hierarchy, and a lower bound on $m_{ee}$ even for the
normal mass ordering. The low-energy lepton-flavour- and CP-violating
observables induced by renormalization are almost independent of leptogenesis.
The electron electric dipole moment may be close to the present bound, reaching
$d_e\sim 10^{-(27-28)}$ e cm in our numerical examples, while $d_\mu$ may reach
$d_\mu\sim 10^{-25}$ e cm.


title: Three-body confinement force in a realistic constituent quark model

abstract:
  We show that in realistic constituent quark models based on a two-body
confinement interaction color states appear in the middle of the experimentally
known spectrum. To avoid this situation we implement a three-body confinement
interaction, introduced on an algebraic basis, into a semirelativistic version
of the Goldstone-boson-exchange constituent quark model and by solving the
Faddeev equations we show that this interaction can increase the gap between
singlet and colour states, such as the latter can be ignored and the known
baryons can be described as $q^3$ systems. We analyze the effect of a $\Delta$-
and a Y-shape three-body interaction.


title: Resource Letter: The Standard Model and Beyond

abstract:
  This Resource Letter provides a guide to literature on the Standard Model of
elementary particles and possible extensions. In the successful theory of
quarks and leptons and their interactions, important questions remain, such as
the mechanism of electroweak symmetry breaking, the origin of quark and lepton
masses, the source of the baryon asymmetry of the Universe, and the makeup of
its matter and energy density. References are cited for quarks and leptons,
gauge theories, color and chromodynamics, weak interactions, electroweak
unification, CP violation, dynamics of heavy quarks, Higgs bosons, precision
electroweak measurements, supersymmetry, dynamical electroweak symmetry
breaking, composite quarks and leptons, grand unification and extended gauge
groups, string theories, large extra dimensions, neutrino masses, cosmic
microwave background radiation, dark matter, dark energy, accelerator
facilities, and non-accelerator experiments.


title: Realistic Dirac Leptogenesis

abstract:
  We present a model of leptogenesis that preserves lepton number. The model
maintains the important feature of more traditional leptogenesis scenarios: the
decaying particles that provide the CP violation necessary for baryogenesis
also provide the explanation for the smallness of the neutrino Yukawa
couplings. This model clearly demonstrates that, contrary to conventional
wisdom, neutrinos need not be Majorana in nature in order to help explain the
baryon asymmetry of the universe.


title: Supersymmetric Dark Matter -- A Physics' Godot?

abstract:
  Where is the long--awaited one? A supersymmetric neutralino has been a
favored candidate for the WIMP dark matter but, so far, it has not been found.
One way to locate it is to identify where it can be hiding in the vast
supersymmetric parameter space. A combination of theoretical, experimental and
cosmological constraints leads to remarkably well--defined allowed regions
which favor lighter neutralino, and other superpartner, mass ranges.
Nevertheless the neutralino can still be as heavy as roughly $800\gev$. The
resulting scalar direct detection cross sections range from some $10^{-7}$ pb
down to $10^{-10}$ pb, which is at least one order of magnitude below the
sensitivity of today's experiments but which will be almost fully explored by a
new generation of planned detectors.


title: Nonlinear Behavior of Quarkonium Formation and Deconfinement Signals

abstract:
  We anticipate new features of quarkonium production in heavy ion collisions
at RHIC and LHC energies which differ from a straightforward extrapolation of
results at CERN SPS energy. General arguments indicate that one may expect
quarkonium formation rates to increase more rapidly with energy and centrality
than the production rate of the heavy quarks which they contain. This is due to
new formation mechanisms in which independently-produced quarks and antiquarks
form a bound quarkonium state. This mechanism will depend quadratically on the
total number of initially-produced heavy quark pairs, and becomes numerically
significant only at RHIC and LHC energy. When viewed as a signal of color
deconfinement, a transition from suppression to enhancement may be observed.
Explicit model calculations are presented, in which one can follow striking
variations of final quarkonium production within a range of parameter space.


title:
On Nature of Right-Handed Singlet in 331 Model and Anomalies before and
  after SSB

abstract:
  The gauge invariant and anomaly-free 331 model is studied with $R_\xi$ gauges
in order to see which of the right-handed singlet between the case (i),
assigning the bosonic singlet to the counterpart of 3 and $\bar 3$
representations, and the case (ii), assigning fermionic siglet to the
counterpart of the left-handed 3 representation and assigning the antifermionic
singlet to that of the left-handed $\bar 3$ representaion, should be assigned
in physics but not mathematics to the counterparts of the left-handed
fundamental 3 representation and the left-handed complex conjugate $\bar 3$
representation. It is shown that through an effect on the Yukawa interaction of
the transformation property of the singlet it depends on the choices of the
case (i) or the case (ii) whether the anomaly coefficients even after the
spontaneous symmetry breaking (SSB) vanish or not, and the coefficients vanish
only in the case (ii) but do not in the case (i). Furthermore, it is pointed
out that the BRS invariance after the SSB holds for the case (ii) and (i-b) of
two possibilities in the choice for the mass eigenstates in the case (i) and
thus the BRS invariance does not necessarily ensure renormalizability of the
theory though the inverse of it holds.


title:
The Finite Temperature SU(2) Savvidy Model with a Non-trivial Polyakov
  Loop

abstract:
  We calculate the complete one-loop effective potential for SU(2) gauge bosons
at temperature T as a function of two variables: phi, the angle associated with
a non-trivial Polyakov loop, and H, a constant background chromomagnetic field.
Using techniques broadly applicable to finite temperature field theories, we
develop both low and high temperature expansions. At low temperatures, the real
part of the effective potential V_R indicates a rich phase structure, with a
discontinuous alternation between confined (phi=pi) and deconfined phases
(phi=0). The background field H moves slowly upward from its zero-temperature
value as T increases, in such a way that sqrt(gH)/(pi T) is approximately an
integer. Beyond a certain temperature on the order of sqrt(gH), the deconfined
phase is always preferred. At high temperatures, where asymptotic freedom
applies, the deconfined phase phi=0 is always preferred, and sqrt(gH) is of
order g^2(T)T. The imaginary part of the effective potential is non-zero at the
global minimum of V_R for all temperatures. A non-perturbative magnetic
screening mass of the form M_m = cg^2(T)T with a sufficiently large coefficient
c removes this instability at high temperature, leading to a stable
high-temperature phase with phi=0 and H=0, characteristic of a
weakly-interacting gas of gauge particles. The value of M_m obtained is
comparable with lattice estimates.


title:
The study of a flavor-changing neutral toppion production process
  $e^+e^-\to t\bar{c}\Pi_t^0$

abstract:
  We have studied a flavor-changing toppion production process $e^{+}e^{-}\to
t\bar{c}\Pi^{0}_{t}$ in the topcolor-assisted technicolor(TC2) model. The
studies show that, with high centre of mass energy in TESLA collider, the
production cross section of $e^{+}e^{-}\to t\bar{c}\Pi^{0}_{t}$ is at the order
of magnitude 0.1 fb in most parameter regions of TC2 model and a few tens
events of toppion can be produced each year. The resonance effect can enhance
the cross section to a few fb when toppion mass is small.
  With clean background, the toppion events can possibly be detected at TESLA
collider. On the other hand, we find that there exists a narrow peak near
$m_t-m_c$ in the toppion-charm invariant mass distribution which could be
clearly detected. Therefore, such a toppion production process $e^{+}e^{-}\to
t\bar{c}\Pi^{0}_{t}$ provides a unique chance to detect toppion events and test
the TC2 model.


title:
On the predictions of dip-effect in Q^2 dependence of electromagnetic
  and electroweak formfactors of pi-meson decay and their experimental
  verification

abstract:
  In present note the arguments in favour of future high statistical
measurements of the formfactors that describe pi-meson decays into
lepton-antilepton pair and photon are presented. It is shown that these
formfactors Q^2 dependence contains the important information on the dynamics
of quark motion inside a hadron.


title: On the Stability of Rapidity Gap Analysis

abstract:
  It is argued that the newly introduced moments of rapidity gaps for the
event-by-event fluctuations depends on the number of events and multiplicity.
The interesting ones of them are unstable under ISR energies of h-h collisions.
The instability get well improved when multiplicity increases.


title: Vacuum polarization energy losses of high energy cosmic rays

abstract:
  The process of the vacuum polarization energy losses of high energy cosmic
rays propagating in the extragalactic space is considered. The process is due
to the polarization of Cosmic Background Radiation by a moving charged
particle. With the goal of the description of the process, the photon mass,
refractive indices and permittivity function for low and high energy photons
are found. Calculations show the rather noticeable level of the energy losses
for propagating protons with the enegies more than 10^6 - 10^7 GeV. The
influence of the polarization energy losses on propagation of cosmic rays is
discussed.


title:
Constraints on Supersymmetric Flavor Changing Parameters Using B->PP
  Decays

abstract:
  We study contributions of quark-squark-gluino interactions in Minimal
Supersymmetric Standard Model (MSSM) to B->PP (PP =Kpi, pipi, KK) decays using
QCD improved factorization method for the evaluation of the hadronic matrix
elements and taking into account renormalization group running of the Wilson
coefficients from SUSY scale (~ m_{\tilde q}) to the low energy scale (= m_b)
applicable to B decays. Using the most recent experimental data we obtain
constraints on flavor changing Supersymmetric (SUSY) parameters
(\delta_{ij})_{LL, RR}. For \Delta S = -1 processes, b-> s gamma is usually
considered to give the strongest limits. We, however, find that in some part of
the parameter space B-> Kpi processes give stronger bounds. Implications for
B^0_s -\bar B^0_s mixing is discussed. We also study cons traints obtained from
\Delta S = 0 processes B-> pipi, KK, rho gamma and B_d -\bar B_d mixing. In
this case, in a large part of the parameter space B_d - \bar B_d provides the
best bound, but B-> K^- K^0, rho gamma can still give interesting constraints
in a complementary region of the parameter space.


title: Bulk viscosity of interacting strange quark matter

abstract:
  The quarks are regarded as quasiparticles, which acquire an effective mass
generated by the interaction with the other quarks of the dense system. The
bulk viscosity is re-expressed in the case of interacting strange quark matter.
We find that the viscosity is a few ~ tens times larger than that of
non-interacting quark gas due to the small correction of medium effect to the
equation of state. The limiting spins of strange stars will rise so
significantly that the pulsars with shorter period may exist.


title:
Spin structure function $g_1(x,Q^2)$ and the DHGHY integral $I(Q^2)$ at
  low $Q^2$: predictions from the GVMD model

abstract:
  Theoretical predictions for polarized nucleon structure function $g_1(x,Q^2)$
at low $Q^2$ are obtained in the framework of the Generalized Vector Meson
Dominance model. Contributions from both light and heavy vector mesons are
evaluated. In the photoproduction limit the first moment of $g_1$ is related to
the static properties of nucleon via the Drell-Hearn-Gerasimov-Hosoda-Yamamoto
sum rule. This property is employed to fix the magnitude of the light vector
meson contribution to $g_1$, using the recent measurements in the region of
baryonic resonances. Results are compared to the data on $g_1(x,Q^2)$. Finally,
the DHGHY moment function $I(Q^2)$ is calculated, and our theoretical
predictions are confronted with the recent preliminary data obtained at the
Jefferson Laboratory.


title: Mass Effects in Hard Exclusive Photoproduction of $J/\Psi$ Mesons

abstract:
  We report on an attempt to describe hard exclusive photoproduction of
$J/\Psi$ mesons, i.e. the reaction $\gamma p \to J/\Psi p$, by means of a
modified version of the hard-scattering approach, in which the proton is
treated as a quark-diquark rather than a three-quark system. In order to
improve the applicability of the model at momentum transfers of only a few GeV
we take into account constituent-mass effects in the calculation of the
perturbative scattering amplitude. With a standard $J/\Psi$-meson distribution
amplitude and diquark-model parameters adopted from preceding investigations of
other photon-induced reactions our predictions for differential cross sections
overestimate the naive extrapolation of the low-momentum transfer ZEUS data.
Our results, however, reveal the importance of taking into account the
charm-quark mass.


title: Status of the NLO Corrections to the Photon Impact Factor

abstract:
  We present the status of the programme of calculating the next-to-leading
order corrections to the virtual photon impact factor. In particular, we
discuss new results for the transversely polarized photon. We briefly outline
the definition of infrared finite terms and the subtraction of the leading
logarithmic parts.


title:
Higgs mass sum rule in the light of searching for $Z^{\prime}$ boson at
  the Tevatron

abstract:
  We discuss the Higgs boson mass sum rules in the Minimal Supersymmetric
Standard Model in order to estimate the upper limits on the masses of stop
quarks as well as the lower bounds on the masses of the scalar Higgs boson
states. The investigation of the bounds on the scale of quark-lepton
compositeness derived from the CDF Collaboration (Fermilab Tevatron) data and
applied to new extra gauge bosons is taken into account. These extra gauge
bosons are considered in the framework of the extended $SU(2)_{h}\times
SU(2)_{l}$ interaction model.


title: The scalar sector of the Randall-Sundrum model

abstract:
  We derive the effective potential for the Standard Model Higgs-boson sector
interacting with Kaluza-Klein excitations of the graviton ($h_\mu^{\nu n}$) and
the radion ($\phi$) and show that {\it only} the Standard Model vacuum solution
of $\partial V(h)/\partial h =0$ (h is the Higgs field) is allowed. We then
consider the consequences of the curvature-scalar mixing xi R \Hhat^\dagger
\Hhat$ (where $\Hhat$ is a Higgs doublet field on the visible brane), which
causes the physical mass eigenstates h and $\phi$ to be mixtures of the
original Higgs and radion fields. First, we discuss the theoretical constraints
on the allowed parameter space. Next, we give precise procedures for computing
the h and $\phi$ couplings given the {\it physical} eigenstate masses, mh and
$\mphi$, xi and the new physics scales of the model. We show that LEP/LEP2 data
implies that not both the h and $\phi$ can be light. In the allowed region of
parameter space, we examine numerically the couplings and branching ratios of
the h and $\phi$ for several cases with $\mh=120\gev$ and $\mphi\leq 300\gev$.
The resulting prospects for detection of the h and $\phi$ at the LHC, a future
LC and a $\gam\gam$ collider are reviewed. For moderate $|\xi|$, both the
anomalous $h\to gg$ coupling and (when $\mh>2\mphi$) the non-standard decay
channel $h \to \phi\phi$ can substantially impact h discovery. Presence of the
latter is a direct signature for non-zero xi. We find that $BR(h \to \phi\phi)$
as large as $30 \div 40 %$ is possible when $|\xi|$ is large. Conversely, if
$\mphi>2\mh$ then $BR(\phi\to hh)$ is generally large. The feasibility of
experimentally measuring the anomalous gg and $\gam\gam$ couplings of the h and
$\phi$ is examined.


title: Resonance Spin Flavour Precession of Solar Neutrinos After SNO NC Data

abstract:
  We present an analysis of the solar neutrino data assuming the deficit of
solar neutrinos to be originated from the interaction of their transition
magnetic moments with the solar magnetic field. We perform fits to the rates
only and global fits and consider separately the existing data prior to the
announcement of the SNO NC results, and present data. Predictions for the
Borexino experiment are also derived. The solar field profiles are taken both
in the radiation zone and core of the sun, and in the convective zone. The
latter are chosen so as to exhibit a rapid increase across the bottom of the
convective zone and a moderate decrease towards the surface. Regarding the
field profiles in the radiative zone and core, it is found that the data show a
preference for those cases in which a strong field rests at the solar centre
with a steep decrease thereafter. For these, the quality of the global fits is
as good as the one from the best oscillation solutions and the same as for the
convective zone profiles examined. It is also found that the $\chi^2$ of the
fits increases when the most recent data are considered, owing to the smaller
errors involved. This in turn provides more precise predictions for Borexino
than previous ones, thus resulting in a clearer possible distinction between
magnetic moment and the currently favoured oscillation solutions.


title: Isolating a light Higgs boson from the di-photon background at the LHC

abstract:
  We compute the QCD corrections to the gluon fusion subprocess gg to gamma
gamma, which forms an important component of the background to the search for a
light Higgs boson at the LHC. We study the dependence of the improved pp to
gamma gamma X background calculation on the factorization and renormalization
scales, on various choices for photon isolation cuts, and on the rapidities of
the photons. We also investigate ways to enhance the statistical significance
of the Higgs signal in the di-photon channel.


title: Gluon Distribution Functions in the kT-factorization Approach

abstract:
  At small x, the effects of finite transverse momenta of partons inside a
hadron become increasingly important, especially in analyses of jets and
heavy-quark production. These effects can be systematically accounted for in a
formalism based on kT-factorization and unintegrated distribution functions. We
present results for the unintegrated distribution function, together with the
corresponding integrated one, obtained within the framework of the Linked
Dipole Chain model. Comparisons are made to results obtained within other
approaches.


title: The Equation of State for Dense QCD and Quark Stars

abstract:
  We calculate the equation of state for degenerate quark matter to leading
order in hard-dense-loop (HDL) perturbation theory. We solve the
Tolman-Oppenheimer-Volkov equations to obtain the mass-radius relation for
dense quark stars. Both the perturbative QCD and the HDL equations of state
have a large variation with respect to the renormalization scale for quark
chemical potential below 1 GeV which leads to large theoretical uncertainties
in the quark star mass-radius relation.


title: Higgs-Boson Interactions within the Randall-Sundrum Model

abstract:
  The scalar sector of the Randall-Sundrum model is discussed. The effective
potential for the Standard Model Higgs-boson (h) interacting with Kaluza-Klein
excitations of the graviton and the radion (phi) has been derived and it has
been shown that only the Standard Model-like vacuum is allowed. The theoretical
and experimental consequences of the curvature-scalar mixing xi RHH introduced
on the visible brane are considered and simple sum rules that relate the
couplings of the mass eigenstates (h) and (phi) to pairs of vector bosons and
fermions are derived. The sum rule for the ZZh and ZZ phi couplings in
combination with LEP/LEP2 data implies that not both the h and phi can be
light. We present explicit results for the still allowed region in the
(mh,mphi) plane that remains after imposing the LEP upper limits for
non-standard scalar couplings to a ZZ pair. The phenomenological consequences
of the mixing are investigated and, in particular, it is shown that the
Higgs-boson decay h -> phi phi would provide an experimental signature for
non-zero xi and can have a very substantial impact on the Higgs-boson searches,
having BR(h->phi phi) as large as 30 - 40 %.


title: The $J/\psi D D$ Vertex in QCD Sum Rules

abstract:
  The $J/\psi D D$ form factor is evaluated in a QCD sum rule calculation for
both $D$ and $J/\psi$ off-shell mesons. We study the double Borel sum rule for
the three point function of two pseudoscalar and one vector meson current. We
find that the momentum dependence of the form factors is different if the $D$
or the $J/\psi$ meson is off-shell, but they lead to the same coupling constant
in the $J/\psi D D$ vertex.


title: CP violation in $B \to PP$ in the SM with SU(3) symmetry

abstract:
  In this paper we study CP violation in $B\to PP$ decays in the Standard Model
using SU(3) flavor symmetry. With SU(3) symmetry only seven hadronic parameters
are needed to describe $B\to PP$ decays in the SM when annihilation
contributions are neglected. The relevant hadronic parameters can be determined
using known experimental data from $B\to \pi\pi$ and $B\to K \pi$. We predict
branching ratios and CP asymmetries for some of the unmeasured $B \to PP$
decays. Some of the CP asymmetries can be large and measured at B factories.
The effects of annihilation contributions can also be studied using present
experimental data. Inclusion of annihilation contributions introduces six more
hadronic parameters. We find that annihilation contributions are in general
small, but can have significant effects on CP asymmetries and some $B_s \to
PP$.


title: QCD at non-zero chemical potential and temperature from the lattice

abstract:
  A study of QCD at non-zero chemical potential, mu, and temperature, T, is
performed using the lattice technique. The transition temperature (between the
confined and deconfined phases) is determined as a function of mu and is found
to be in agreement with other work. In addition the variation of the pressure
and energy density with mu is obtained for small positive mu. These results are
of particular relevance for heavy-ion collision experiments.


title: Reshuffling the OPE: Delocalized Operator Expansion

abstract:
  A prescription for the short-distance expansion of Euclidean current
correlators based on a delocalized modification of the multipole expansion of
perturbative short-distance coefficient functions is proposed that appreciates
the presence of nonlocal physics in the nonperturbative QCD vacuum. This
expansion converges better than the local Wilson OPE, which is recovered in the
limit of infinite resolution. As a consequence, the usual local condensates in
the Wilson OPE become condensates that depend on a resolution parameter and
that can be expressed as an infinite series of local condensates with
increasing dimension. In a calculation of the nonperturbative correction to the
ground state energy level of heavy quarkonia the improved convergence
properties of the delocalized expansion are demonstrated. Phenomenological
evidence is gathered that the gluon condensate, often being the leading
nonperturbative parameter of the Wilson OPE, is indeed a function of
resolution. The delocalized expansion is applied to derive a leading order
scaling relation for $f_D/f_B$ in the heavy mass expansion.


title:
A NLO calculation of the hadron-jet cross section in photoproduction
  reactions

abstract:
  We study the photoproduction of large-p_T charged hadrons in e p collisions,
both for the inclusive case and for the case where a jet in the final state is
also measured. Our results are obtained by a NLO generator of partonic events.
We discuss the sensitivity of the cross section to the renormalisation and
factorisation scales, and to various fragmentation function parametrisations.
The possibility to constrain the parton densities in the proton and in the
photon is assessed. Comparisons are made with H1 data for inclusive charged
hadron production.


title: Statistical hadronisation phenomenology

abstract:
  The analyses of hadron production in the framework of the statistical
hadronisation model are reviewed. The analysis of average multiplicities in
collisions at relatively low centre-of-mass energy confirms previous findings,
namely the universality of hadronisation temperature and of strange to
non-strange quark production rate. The study of transverse momentum spectra of
identified hadrons allows a further determination of the hadronisation
temperature which is found to be compatible with that obtained from fits to
average multiplicities.


title:
Estimating the small-x exponent of the nonsinglet structure function g1
  from the Bjorken Sum Rule

abstract:
  We present a new estimate of the exponent governing the small-x behaviour of
the nonsinglet structure function g_1(p-n) derived under the assumption that
the Bjorken Sum Rule is valid. We use the world wide average of alpha_s and the
NNNLO QCD corrections to the Bjorken Sum Rule. The structure function g_1(NS)
is found to be clearly divergent for small x.


title:
Triple and quartic interactions of Higgs bosons in the two-Higgs-doublet
  model with CP violation

abstract:
  We consider the two-Higgs-doublet model with explicit CP-violation, where the
effective Higgs potential is not CP-invariant at the tree-level. Three neutral
Higgs bosons of the model are the mixtures of CP-even and CP-odd bosons which
exist in the CP-conserving limit of the theory. The mass spectrum and
tree-level couplings of the neutral Higgs bosons to gauge bosons and fermions
are significantly dependent on the parameters of the Higgs boson mixing matrix.
We calculate the Higgs-gauge boson, Higgs-fermion, triple and quartic Higgs
self-interactions in the MSSM with explicit CP-violation in the Higgs sector
and CP-violating Yukawa interactions of the third generation scalar quarks. In
some regions of the MSSM parameter space substantial changes of the
self-interaction vertices take place, leading to significant suppression or
enhancement of the multiple Higgs boson production cross sections.


title:
The $\tau$-polarisation test for the $H/A\to\tau^+\tau^-$ signal at the
  LHC

abstract:
  The correlation between the two $\tau$-polarisations is predicted to be
opposite $(+-/-+)$ for the $H/A \to \tau^+\tau^-$ signal, while it corresponds
to the same sign combinations for the Drell-Yan $(++/--)$ and $t \bar t$ $(--)$
backgrounds. We show that this correlation can serve as a distinctive test to
confirm the presence of the MSSM Higgs bosons $H$ and $A$ in their hadronic
$\tau^+\tau^-$ decay channels at the LHC.


title: Exploring the neutrino mass matrix at M_R scale

abstract:
  We discuss the neutrino mass matrix which predicts zero or small values of
|V_{13}| in MSSM and found the inequality, sin^2 2theta_{12} <= sin^2
2theta_sol, where sin^2 2theta_{12} is the mixing angle at M_R scale and sin^2
2theta_{sol} is the value determined by the solar neutrino oscillation. This
constraint says that the model which predicts a larger value of tan^2
theta_{sol} at M_R than the experimental value is excluded. In particular, the
bi-maximal mixing scheme at M_R scale is excluded, from the experimental value
tan^2 theta_sol<1. In this model, |V_{13}| and a Dirac phase at m_Z are induced
radiatively and turn out to be not small. The effective neutrino mass <m_nu> is
expected to be of order 0.05 eV.


title: Detection of heavy charged Higgs bosons at future Linear Colliders

abstract:
  We show how a statistically significant signal of heavy charged Higgs bosons
of a general Two-Higgs Doublet Model produced in association with tau-neutrino
pairs can be established at future Linear Colliders in the $H^+\to t\bar b\to
4$ jet decay channel. This signature is particularly relevant in the kinematic
configuration $\sqrt s\lsim2 M_{H^\pm}$, when the pair production channel
$e^+e^-\to H^-H^+$ is no longer available. Here, the initially overwhelming
background, constituted by top quark pair production and decay, can vigorously
be reduced thanks to a dedicated selection procedure that allows one to extract
a signal in a region of several tens of GeV around $M_{H^\pm}\approx \sqrt
s/2$, for $\tan\beta\gsim40$.


title: QCD effective actions from the solutions of the transport equations

abstract:
  We solve the collisionless transport equations of a quark-gluon plasma
interacting through mean chromodynamic fields. The system is assumed to be
translation invariant in one or more space-time directions. We present exact
solutions that hold if the vector gauge fields in the direction of the
translation invariance commute with their covariant derivatives. We also solve
the equations perturbatively when the commutation condition is relaxed.
Further, we derive the color current and the associated effective action. For
the static quasi-equilibrium system, our results reproduce the full one-loop
effective action of QCD in the presence of constant background fields, where
the above mentioned commutation condition is satisfied.


title: Graviton production from extra dimensions

abstract:
  Graviton production due to collapsing extra dimensions is studied. The
momenta lying in the extra dimensions are taken into account. A $D$-dimensional
background is matched to an effectively four-dimensional standard radiation
dominated universe. Using observational constraints on the present
gravitational wave spectrum, a bound on the maximal temperature at the
beginning of the radiation era is derived. This expression depends on the
number of extra dimensions, as well as on the $D$-dimensional Planck mass.
Furthermore, it is found that the extra dimensions have to be large.


title:
Does Solar Physics Provide Constraints to Weakly Interacting Massive
  Particles?

abstract:
  We investigate whether present data on helioseismology and solar neutrino
fluxes may constrain WIMP--matter interactions in the range of WIMP parameters
under current exploration in WIMP searches. We find that, for a WIMP mass of 30
GeV, once the effect of the presence of WIMPs in the Sun's interior is
maximized, the squared isothermal sound speed is modified, with respect to the
standard solar model, by at most 0.4% at the Sun's center. The maximal effect
on the Boron-8 solar neutrino flux is a reduction of 4.5%. Larger masses lead
to smaller effects. These results imply that present sensitivities in the
measurements of solar properties, though greatly improved in recent years, do
not provide information or constraints on WIMP properties of relevance for dark
matter. Furthermore, we show that, when current bounds from direct WIMP
searches are taken into account, the effect induced by WIMPs with dominant
coherent interactions are drastically reduced as compared to the values quoted
above. The case of neutralinos in the minimal supersymmetric standard model is
also discussed.


title: Topological Defect Densities in Type-I Superconducting Phase Transitions

abstract:
  We examine the consequences of a cubic term addition to the mean-field
potential of Ginzburg-Landau theory to describe first order superconductive
phase transitions. Constraints on its existence are obtained from experiment,
which are used to assess its impact on topological defect creation. We find no
fundamental changes in either the Kibble-Zurek or Hindmarsh-Rajantie
predictions.


title: Quark-Hadron Picture of the Deuteron Photodisintegration

abstract:
  The high energy two-body photodisintegration of the deuteron is an ideal
reaction for the identification of quark effects in the nuclei. In particular,
the study of this reaction in the few GeV region can clarify the transition
from the nucleonic degrees of freedom to the QCD picture of hadrons. The CLAS
large angle spectrometer of Hall B at TJNAF allowed for the first time to
measure the differential cross section for photon energy between 0.5 and 3 GeV,
over all proton angles between 10 and 140 degrees in the laboratory frame.
Preliminary results from the analysis of 30% of the total statistic accumulated
is shown. These results are in good agreement with the available data, and are
well described by the recent calculation of the deuteron photodisintegration
cross section derived in the framework of the Quark Gluon String Model.


title: Heisenberg's Universal (lns)**2 Increase of Total Cross Sections

abstract:
  The (lns)**2 behaviour of total cross-sections, first obtained by Heisenberg
50 years ago, receives now increased interest both on phenomenological and
theoretical levels. In this paper we present a modification of the Heisenberg's
model in connection with the presence of glueballs and we show that it leads to
a realistic description of all existing hadron total cross-section data.


title: Deeply Virtual Compton Scattering on the Deuteron

abstract:
  We study deeply virtual Compton scattering (DVCS) on a deuteron target. We
model the Generalized Quark Distributions in the deuteron by using the impulse
approximation for the lowest Fock-space state. Numerical predictions are given
for the unpolarized cross sections for the kinematical regimes relevant for
JLab and HERMES at HERA. Differential cross sections show the same pattern as
for the proton case and at low values of t they are of comparable size.


title:
Gluon Distributions and Color Charge Correlations in a Saturated
  Light-cone Wavefunction

abstract:
  We describe the light-cone wavefunction in the saturation regime in terms of
the density of gluons per unit of transverse phase space, the occupation
number, and in terms of the color charge correlator. The simple McLerran-
Venugopalan model gives what are claimed to be general results for the phase
space gluon density, but it does not well describe the general case for the
charge correlator. We derive the general momentum dependence and rapidity
dependence of the color charge correlator which exhibits strong color
shielding. A simplel physical picture which leads to these general results is
described.


title: Has the GZK suppression been discovered?

abstract:
  The energy spectra of ultra high energy cosmic rays reported by the AGASA,
Fly's Eye, Haverah Park, HiRes, and Yakutsk experiments are all shown to be in
agreement with each other for energies below 10^{20} eV (after small
adjustments, within the known uncertainties, of the absolute energy scales).
The data from HiRes, Fly's Eye, and Yakutsk are consistent with the expected
flux suppression above 5\times 10^{19} eV due to interactions of cosmic rays
with the cosmic microwave background, the Greisen-Zatsepin-Kuzmin (GZK)
"supression," and are inconsistent with a smooth extrapolation of the observed
cosmic ray energy spectrum to energies > 5\times 10^{19}$ eV. AGASA data show
an excess of events above 10^{20} eV, compared to the predicted GZK suppression
and to the flux measured by the other experiments.


title:
Parton saturation effects to the Drell-Yan process in the color dipole
  picture

abstract:
  We report on the results obtained in the study of the parton saturation
effects, taken into account through the multiscattering Glauber-Mueller
approach, applied to the Drell-Yan (DY) process described in the color dipole
picture. As a main result, one shows that those effects play an important role
in the estimates of the DY differential cross section atRHIC energies.


title:
The S-Wave Pion-Nucleon Scattering Lengths from Pionic Atoms using
  Effective Field Theory

abstract:
  The pion-deuteron scattering length is computed to next-to-next-to-leading
order in baryon chiral perturbation theory. A modified power-counting is then
formulated which properly accounts for infrared enhancements engendered by the
large size of the deuteron, as compared to the pion Compton wavelength. We use
the precise experimental value of the real part of the pion-deuteron scattering
length determined from the decay of pionic deuterium, together with constraints
on pion-nucleon scattering lengths from the decay of pionic hydrogen, to
extract the isovector and isoscalar S-wave pion-nucleon scattering lengths, a^-
and a^+, respectively. We find a^-=(0.0918 \pm 0.0013) M_\pi^{-1} and
a^+=(-0.0034 \pm 0.0007) M_\pi^{-1}.


title: Heavy Quark Photoproduction in Ultra-peripheral Heavy Ion Collisions

abstract:
  Heavy quarks are copiously produced in ultra-peripheral heavy ion collisions.
In the strong electromagnetic fields, c c-bar and b b-bar are produced by
photonuclear and two-photon interactions; hadroproduction can occur in grazing
interactions. We present the total cross sections, quark transverse momentum
and rapidity distributions, as well as the Q Q-bar invariant mass spectra from
the three production channels. We consider AA and pA collisions at the
Relativistic Heavy Ion Collider and Large Hadron Collider. We discuss
techniques for separating the three processes and describe how the AA to pA
production ratios might be measured accurately enough to study nuclear
shadowing.


title:
A study of QCD coupling constant from fixed target deep inelastic
  measurements

abstract:
  We reanalyze deep inelastic scattering data of BCDMS Collaboration by
including proper cuts of ranges with large systematic errors. We perform also
the fits of high statistic deep inelastic scattering data of BCDMS, SLAC, NM
and BFP Collaborations taking the data separately and in combined way and find
good agreement between these analyses. We extract the values of the QCD
coupling constant \alpha_s(M^2_Z) up to NLO level. The fits of the combined
data for the nonsinglet part of the structure function F_2 predict the coupling
constant value \alpha_s(M^2_Z) = 0.1174 \pm 0.0007 (stat) \pm 0.0019 (syst) \pm
0.0010 (normalization). The fits of the combined data for both: the nonsinglet
part of F_2 and the singlet one, lead to the values \alpha_s(M^2_Z) = 0.1177
\pm 0.0007 (stat) \pm 0.0021 (syst) \pm 0.0009 (normalization). Both above
values are in very good agreement with each other.


title: Perturbative stability of the QCD analysis of DIS data

abstract:
  We perform pQCD analysis of the existing DIS data for charged leptons with
account of corrections up to the NNLO. The parton distributions, value of
strong coupling constant, and high-twist terms are extracted and their
stability with respect to account of the NNLO corrections is analyzed. All the
quantities are generally stable within their experimental errors. Obtained
value of the strong coupling constant is $\alpha_s^{\rm NNLO}(M_{\rm
Z})=0.1143\pm 0.0014 ({\rm exp})$ with a guess $\alpha_s^{\rm NNNLO}(M_{\rm
Z})\sim 0.113$.


title: Probing Noncommutative Space-Time in the Laboratory Frame

abstract:
  The phenomenological investigation of noncommutative space-time in the
laboratory frame are presented. We formulate the apparent time variation of
noncommutativity parameter $\theta_{\mu\nu}$ in the laboratory frame due to the
earth's rotation. Furthermore, in the noncommutative QED, we discuss how to
probe the electric-like component
  $\overrightarrow{\theta_{E}}=(\theta_{01},\theta_{02},\theta_{03})$ by the
process $e^-e^+\to\gamma\gamma$ at future $e^-e^+$ linear collider.
  We may determine the magnitude and the direction of
  $\overrightarrow{\theta_{E}}$ by detailed study of the apparent time
variation of total cross section.
  In case of us observing no signal, the upper limit on the magnitude of
$\overrightarrow{\theta_E^{}}$ can be determined independently of its
direction.


title: A Problematic Set of Two-Loop Self-Energy Corrections

abstract:
  We investigate a specific set of two-loop self-energy corrections involving
squared decay rates and point out that their interpretation is highly
problematic. The corrections cannot be interpreted as radiative energy shifts
in the usual sense. Some of the problematic corrections find a natural
interpretation as radiative nonresonant corrections to the natural line shape.
They cannot uniquely be associated with one and only one atomic level. While
the problematic corrections are rather tiny when expressed in units of
frequency (a few Hertz for hydrogenic P levels) and do not affect the
reliability of quantum electrodynamics at the current level of experimental
accuracy, they may be of importance for future experiments. The problems are
connected with the limitations of the so-called asymptotic-state approximation
which means that atomic in- and out-states in the S-matrix are assumed to have
an infinite lifetime.


title: The Vietri Codices

abstract:
  Studying heavy flavour physics is driven by multiple motivations: to probe
our theoretical control over QCD; enhance our information on gluon and sea
quark structure functions; use heavy flavour production as signal for the onset
of the quark-gluon plasma; revisit light flavour spectroscopy through the final
states in heavy flavour decays; extract fundamental quantities like CKM and MNS
parameters; search for new Physics. The last two years have witnessed
tremendous amplification in our knowledge of heavy flavour dynamics. We know
the elements of the CKM matrix with significantly improved reliability; a new
door has been opened by the observation of K^+ --> pi^+ nu nu-bar; with direct
CP violation being established in K_L decays and the expected huge CP asymmetry
been observed in B_d(t) --> psi K_S the CKM description has attained the level
of a tested theory of CP violation. Yet more than ever the Standard Model is
viewed as incomplete: apart from the peculiar pattern in mass related
parameters of the fundamental fermions there is more direct evidence in the
signals for neutrino oscillations, the strong CP problem and the baryon number
of the universe. A worldwide, interrelated and comprehensive program has been
developed for heavy quark and lepton physics that will provide essential
impetus towards a deeper understanding of nature's grand design.


title:
D-wave Charmonium Production in $e^+e^-$ Annihilation at $\sqrt{s}=10.6$
  GeV

abstract:
  We calculate the D-wave charmonium production in $e^+e^-$ annihilation at
BELLE and BABAR at $\sqrt{s}=10.6$ GeV using the nonrelativistic QCD
factorization formalism, including color singlet and color octet contributions.
We analyze the contributions of various processes for $\delta_J(J=1,2)$
production. We find that both the color singlet and color octet channels may
give substantial contributions, and the production rates are estimated to be
$\sigma (\delta_1)\simeq 0.043-0.16pb$ and $\sigma (\delta_2)\simeq
0.094-0.29pb$, which, however, are very sensitive to the choice of the color
octet matrix elements of the D-wave charmonium states. The measurement of
D-wave charmonium production at BABAR and BELLE in the future will be very
helpful to test the color octet mechanism and to determine the color octet
matrix elements.


title:
Semi-inclusive Decay $B\to \phi X_s$: Rate and Momentum Spectrum of
  $\phi$

abstract:
  We study the rate and $\phi$ momentum distribution in semi-inclusive decays
$B \to\phi X_s $ induced by the quark level processes $b\to\phi s$ and
$b\to\phi s g$, in which the gluon is radiated from the internal charm quark
loop or emitted from the virtual gluon of the strong penguin (inner
bremsstrahlung). We find ${\cal B}(b\to\phi s)=6.7\times 10^{-5}$ and ${\cal
B}(b\to\phi s g)=3.8\times 10^{-5}$. The momentum spectrum of $\phi$ produced
by $b\to\phi s g $ is very broad. With the cut $|{\bf k}_{\phi}|\geq 2.0$ GeV,
${\cal B}(b\to\phi s)=6.1\times 10^{-5}$ (where the Fermi motion of the
$b$-quark in the $B$-meson is described by a Gaussian), and ${\cal B}(b\to\phi
s g)=1.0\times 10^{-5}$. Due to the special nature of $\phi$, many difficulties
which hindered a reliable theoretical prediction for $B\to \eta' X_s$ decay are
absent in the process $B\to \phi X_s$. Therefore, theoretical predictions for
$B\to \phi X_s$ are relatively clean. Moreover, the clear experimental
signature of the $\phi$ is of great help. Data for $B\to\phi X_s$, both the
branching ratio and the $\phi$ momentum distribution, would teach us about the
strength of strong penguins which might be of great importance in the search
for CP violation and for new physics at $B$ factories.


title: The Chiral Phase Transition in Dissipative Dynamics

abstract:
  Numerical simulations of the chiral phase transition in the (3+1)dimensional
O(4)-model are presented. The evolutions of the chiral field follow purely
dissipative dynamics, starting from random chirally symmetric initial
configurations down to the true vacuum with spontaneously broken symmetry. The
model stabilizes topological textures which are formed together with domains of
disoriented chiral condensate (DCC) during the roll-down phase. The classically
evolving field acts as source for the emission of pions and $\sigma$ mesons.
The exponents of power laws for the growth of angular correlations and for
emission rates are extracted. Fluctuations in the abundance ratios for neutral
and charged pions are compared with those for uncorrelated sources as potential
signature for the chiral phase transition after heavy-ion collisions. It is
found that the presence of stabilizing textures (baryons and antibaryons)
prevents sufficiently rapid growth of DCC-domain size, so observability of
anomalous tails in the abundance ratios is unlikely. However, the transient
formation of growing DCC domains causes sizable broadening of the distributions
as compared to the statistical widths of generic sources.


title: From QCD lattice calculations to the equation of state of quark matter

abstract:
  We describe two-flavor QCD lattice data for the pressure at finite
temperature and zero chemical potential within a quasiparticle model. Relying
only on thermodynamic selfconsistency, the model is extended to nonzero
chemical potential. The results agree with lattice calculations in the region
of small chemical potential.


title:
Dependence of hadron spectra on decoupling temperature and resonance
  contributions

abstract:
  Using equilibrium hydrodynamics with initial conditions for the energy and
net baryon number densities from the perturbative QCD + saturation model, a
good simultaneous description of the measured pion, kaon and (anti)proton
spectra in central Au+Au collisions at $\sqrt s=130 A$GeV is found with a
single decoupling temperature $\Tdec=150...160$ MeV. The interplay between the
resonance content of the EoS and the development of the transverse flow leads
to inverse slopes and $<p_T>$ of hadrons which increase with decreasing
$\Tdec$. The origin of this result is discussed.


title: Precision Electroweak Tests of the Standard Model

abstract:
  The present status of precision electroweak data is reviewed. These data
include measurements of e+e- -> f+fbar, taken at the Z resonance at LEP, which
are used to determine the mass and width of the Z boson. In addition,
measurements have also been made of the forward-backward asymmetries for
leptons and heavy quarks, and also the final state polarisation of the
tau-lepton. At SLAC, where the electron beam was polarised, measurements were
made of the left-right polarised asymmetry, A_LR, and the left-right
forward-backward asymmetries for b and c quarks.
  The mass, MW, and width, GW, of the W boson have been measured at the
Tevatron and at LEP, and the mass of the top quark, Mt, has been measured at
the Tevatron. These data, plus other electroweak data, are used in global
electroweak fits in which various Standard Model parameters are determined. A
comparison is made between the results of the direct measurements of MW and Mt
with the indirect results coming from electroweak radiative corrections. Using
all precision electroweak data fits are also made to determine limits on the
mass of the Higgs boson. The influence on these limits of specific
measurements, particularly those which are somewhat inconsistent with the
Standard Model, is explored. The data are also analysed in terms of the quasi
model-independent epsilon variables.
  Finally, the impact on the electroweak fits of the improvements in the
determination of the W-boson and top-quark masses, expected from the Tevatron
Run 2, is examined.


title: Non-Anomalous Flavor Symmetries and $SU(6) \times SU(2)_R$ Model

abstract:
  We introduce the flavor symmetry ${\bf Z}_M \times {\bf Z}_N \times D_4$ into
the $SU(6) \times SU(2)_R$ string-inspired model. The cyclic group ${\bf Z}_M$
and the dihedral group $D_4$ are R symmetries, while ${\bf Z}_N$ is a non-R
symmetry. By imposing the anomaly-free conditions on the model, we obtain a
viable solution under many phenomenological constraints coming from the
particle spectra. For neutrino sector, we find a LMA-MSW solution but not
SMA-MSW ones. The solution includes phenomenologically acceptable results
concerning fermion masses and mixings and also concerning hierarchical energy
scales including the GUT scale, the $\mu$ scale and the Majorana mass scale of
R-handed neutrinos.


title:
A test of the instanton vacuum with low-energy theorems of the axial
  anomaly

abstract:
  We revisit the QCD+QED axial anomaly low-energy theorems which give an exact
relation between the matrix elements of the gluon and photon parts of the axial
anomaly operator equation within the framework of the {\em effective action}
derived from the instanton vacuum. The matrix elements between the vacuum and
two photon states and between the vacuum and two gluon states are investigated
for arbitrary $N_f $ in the chiral limit. Having gauged the effective action
properly, we show that the model does exactly satisfy the low-energy theorems.


title:
Study on Two Coupled Relativistic Superfluids with Spontaneous Symmetry
  Breaking

abstract:
  In this paper, we have studied two coupled relativistic superfluids with
spontaneous U(1) symmetry breaking, using Poisson bracket technique. After
constructing the commutators between thermo-quantities and field quantities,
the equations of motion are obtained. These equations describe the system in
the frame of two-constituent superfluid theory and provide a clear picture
relating the symmetry breaking and the physical quantities explicitly. The
interference effect is discussed and the Josephson-type equation is also given.
Furthermore, the dissipation effect and entropy production mechanism are
presented and the dissipative coefficients are given explicitly in the
first-order theory framework.


title: Mapping the Transverse Nucleon Spin

abstract:
  The transverse nucleon spin can be transferred to the quarks and gluons in
several ways. In the factorizing, hard scattering processes to be considered,
these are parameterized at leading twist by the transversity distribution
function and at next-to-leading twist by quark-gluon correlation functions. The
latter enter the description of the structure function $g_2$ and possibly of
single spin asymmetries. It is discussed what is known about these functions
and what are the remaining open issues.


title:
Remarks on the U(1) axial symmetry in QCD at zero and non-zero
  temperature

abstract:
  This paper is organized in two parts. The first part (Sections 2-5) is
dedicated to the theory at T=0 and contains a pedagogical review of some
fundamental aspects related with the chiral symmetries of QCD, the U(1) problem
and its solution proposed by 'tHooft, Witten and Veneziano. In the second part
(Sections 6-14) we discuss the role of the U(1) axial symmetry for the phase
structure of QCD at finite temperature. One expects that, above a certain
critical temperature, also the U(1) axial symmetry will be restored. We will
try to see if this transition has (or has not) anything to do with the usual
chiral transition: various possible scenarios are discussed. In particular, we
analyse a scenario in which the U(1) axial symmetry is still broken above the
chiral transition. We will show that this scenario can be consistently
reproduced in the full respect of the relevant QCD Ward Identities and also
using an effective Lagrangian model. A new order parameter is introduced for
the U(1) axial symmetry.


title: First lattice QCD estimate of the g_{D^* D pi} coupling

abstract:
  We present the results of the first lattice QCD study of the strong coupling
g_{D^* D pi}. From our simulations in the quenched approximation, we obtain
g_{D^* D pi} = 18.8 +/- 2.3^{+1.1}_{-2.0} and hat(g)_c = 0.67 +/-
0.08^{+0.04}_{-0.06}. Whereas previous theoretical studies gave different
predictions, our result favours a large value for hat(g)_c. It agrees very well
with the recent experimental value by CLEO. hat(g) varies very little with the
heavy mass and we find in the infinite mass limit hat(g)_infinity = 0.69(18).


title: Thermal rho and sigma mesons from chiral symmetry and unitarity

abstract:
  We study the temperature evolution of the rho and sigma mass and width, using
a unitary chiral approach. The one-loop pion-pion scattering amplitude in
Chiral Perturbation Theory at finite temperature is unitarized via the Inverse
Amplitude Method. Our results predict a clear increase with T of both the rho
and sigma widths. The masses decrease slightly for high T, while the
rho-pion-pion coupling increases. The rho behavior seems to be favored by
experimental results. In the sigma case, it signals chiral symmetry
restoration.


title: Antisymmetric Higgs representation in SO(10) for neutrinos

abstract:
  A Model based on SO(10) grand unified theory (GUT) and supersymmetry is
presented to describe observed phenomena for neutrinos. The large mixing angles
among different generations, together with the small masses, are attributed to
the Higgs boson structure at the GUT energy scale. Quantitative discussions for
these observables are given, taking into account their energy evolution.


title: The decay eta_c^prime -> eta_c pi pi

abstract:
  It is pointed out that the decay of the recently observed charmonium
eta_c^prime resonance, eta_c^prime -> eta_c pi pi is simply related to the well
studied decay psi^prime -> J/psi pi pi and can thus be used for absolute
normalization of other decay modes of the eta_c^prime. The total rate of the
discussed decay should be approximately three to four times the corresponding
rate for the psi^prime$ resonance making the channel with charged pions the
most probable exclusive decay mode of the eta_c^prime with the branching ratio
in the range 5-10 %.


title: Froissart Bound from Gluon Saturation

abstract:
  We demonstrate that the dipole-hadron cross-section computed from the
non-linear evolution equation for the Colour Glass Condensate saturates the
Froissart bound in the case of a fixed coupling and for a small dipole (Q^2 >>
Lambda_{QCD}^2). That is, the cross-section increases as the logarithm squared
of the energy, with a proportionality coefficient involving the pion mass and
the BFKL intercept (alpha_s N_c/pi)4 ln 2. The pion mass enters via the
non-perturbative initial conditions at low energy. The BFKL equation emerges as
a limit of the non-linear evolution equation valid in the tail of the hadron
wavefunction. We provide a physical picture for the transverse expansion of the
hadron with increasing energy, and emphasize the importance of the colour
correlations among the saturated gluons in suppressing non-unitary
contributions due to long-range Coulomb tails. We present the first calculation
of the saturation scale including the impact parameter dependence. We show that
the cross-section at high energy exhibits geometric scaling with a different
scaling variable as compared to the intermediate energy regime.


title:
Implications of B -> rho gamma measurements in the Standard Model and
  Supersymmetric Theories

abstract:
  We study the implications of the recently improved upper limits on the
branching ratios for the decays B -> rho gamma, expressed as R(rho gamma/K^*
gamma) = BR(B -> rho gamma)/BR(B -> K^* gamma) <0.047. We work out the
constraints that the current bound on R(rho gamma/K^* gamma) implies on the
parameters of the quark mixing matrix in the standard model (SM). Using the
present profile of the unitarity triangle, we predict this ratio to be R(rho
gamma/K^* gamma) = 0.023 +/- 0.012. We also work out the correlations involving
R(rho gamma/K^* gamma), the isospin-violating ratio Delta (rho gamma), and the
direct CP-violating asymmetry A_CP (rho gamma) in B -> rho gamma decays in the
SM, in the minimal supersymmetric extension of the SM (MSSM), and in an
extension of the MSSM involving an additional flavor-changing structure in b ->
d transitions.


title: Scale dependence of the quark masses and mixings: leading order

abstract:
  We consider the Renormalization Group Equations (RGE) for the couplings of
the Standard Model and its extensions. Using the hierarchy of the quark masses
and of the Cabibbo-Kobayashi-Maskawa (CKM) matrix our argument is that a
consistent approximation for the RGE should be based on the parameter $\lambda=
|\hat{V}_{ud}| \approx0.22$. We consider the RGE in the approximation where we
neglect all the relative terms of the order $\sim\lambda^{4}$ and higher.
Within this approximation we find the exact solution of the evolution equations
of the quark Yukawa couplings and of the vacuum expectation value of the Higgs
field. Then we derive the evolution of the observables: quark masses, CKM
matrix, Jarlskog invariant, Wolfenstein parameters of the CKM matrix and the
unitarity triangle. We show that the angles of the unitarity triangle remain
constant. This property may restrict the possibility of new symmetries or
textures at the grand unification scale.


title: Nuclear Disintegration in Magnetic Fields

abstract:
  We employ the Weizsaecker-Williams method of virtual quanta to study
disintegration of nuclei in magnetic field. We explore a variety of field
configurations and conclude that for the energy range of interest for
applications to cosmic rays (10^{18}-10^{21} eV) such disintegrations are not a
significant source of energy or flux loss for any realistic acceleration
mechanism.


title: A Predictive Ansatz for Neutrino Mixing and Leptogenesis

abstract:
  We propose a non-SO(10) modification of the Buchmueller-Wyler ansatz for
neutrino mixing and leptogenesis, in which charged lepton, Dirac and Majorana
neutrino mass matrices have fewer free parameters. Predictions of this new
ansatz for three light neutrino masses, three lepton flavor mixing angles, the
neutrinoless double-beta decay and the cosmological matter-antimatter asymmetry
are all in very good agreement with current experimental and observational
data.


title: Diffraction and sigma_{gamma* p}

abstract:
  The empirical scaling law, wherein the total photoabsorption cross section
depends on the single variable eta=(Q^2+m_0^2)/Lambda^2(W^2), provides
empirical evidence for saturation in the sense of sigma_{gamma*
p}(W^2,Q^2)/sigma_{gamma p}(W^2) --> 1 for W^2 --> infinity at fixed Q^2. The
total photoabsorption cross section is related to elastic diffraction in terms
of a sum rule. The excess of diffractive production over the elastic component
is due to inelastic diffraction that contains the production of hadronic states
of higher spins. Motivated by the diffractive mass spectrum, the generalized
vector dominance/color dipole picture (GVD/CDP) is extended to successfully
describe the DIS data in the full region of x=<0.1, all Q^2>=0, where the
diffractive two-gluon-exchange mechanism dominates.


title: Further remarks on $\pi\pi$ scattering dispersion relations

abstract:
  The naive use of higher order perturbation theory leads the left--hand cut
integrals in $\pi\pi$ dispersion relations~\cite{hjy,Xiao01} divergent. This
problem is discussed and solved. Also we point out that the Adler zero
condition imposes three constraints on the dispersion relations. The $\sigma $
pole position is determined using the improved method, $M_\sigma= 483\pm 13
{\rm MeV}$,$\Gamma_\sigma=
  705 \pm 50{\rm MeV}$. The scattering length parameter is found to be in
excellent agreement with the experimental result.


title:
3- and 2-body supersymmetric processes: predictions, challenges and
  prospectives

abstract:
  The processes subject of this talk are: 1) the 2 --> 3 processes
contributing, together with the 2 --> 2 one to the hadron-collider production
of a charged Higgs boson in association with a t-quark; 2) the 2 --> 2 and 2
--> 3 processes giving rise to the hadron-collider strahlung of a charged
slepton from a t-quark in R_p-violating models in which lepton-number-violating
trilinear couplings largely dominate over bilinear ones; 3) 3-body neutralino
and chargino decays in similar R_p-violating scenarios. The significance of the
R_p-violating processes is critically assessed against implications from
neutrino physics. Contributions to neutrino masses arising at the tree level,
at the one- and two-loop levels are reviewed. Comments are also made on the
production of sneutrinos via gluon fusion and on the decay of sneutrinos into
photons pairs, and on the influence that constraints from neutrino physics have
on these processes.


title:
GENIUS - A New Underground Observatory for Non-Accelerator Particle
  Physics

abstract:
  The GENIUS (Germanium in Liquid Nitrogen Underground Setup) project has been
proposed in 1997 [KK-BEY97] as first third generation double beta decay
project, with a sensitivity aiming down to a level of an effective neutrino
mass of <m_{\nu}> < 0.01eV or less. Such sensitivity is important to fix the
structure of the neutrino mass matrix with high accuracy, which cannot be done
by neutrino oscillation experiments alone. GENIUS will allow broad access also
to many other topics of physics beyond the Standard Model of particle physics
at the multi-TeV scale. For search of cold dark matter GENIUS will cover a
large part of the parameter space of predictions of SUSY for neutralinos as
dark matter [Bed-KK2,Ell,KK-LowNu2]. Finally, GENIUS has the potential to be a
real-time detector for low-energy (pp and 7{Be}) solar neutrinos
[Bau-KK,KK-LowNu2]. A GENIUS-Test Facility has just been funded and will come
into operation by end of 2002.


title: Search for Dark Matter by GENIUS-TF and GENIUS

abstract:
  The new project GENIUS will cover a wide range of the parameter space of
predictions of SUSY for neutralinos as cold dark matter. Together with DAMA it
will be the only experiment which can probe the seasonal modulation signal.
Concerning hot dark matter GENIUS will be able to fix the (effective) neutrino
mass with high accuracy. A GENIUS Test Facility has just been funded and will
come into operation by end of 2002.


title: A Duality as a Theory for the Electroweak Interactions

abstract:
  We present a model based on a SU(2) confining theory which is dual to the
standard model. This duality allows to calculate the electroweak mixing angle
and the Higgs boson mass. Possible tests of this duality are discussed.


title: Exploring Light-Cone Sum Rules for Pion and Kaon Form Factors

abstract:
  We analyze the higher-twist effects and the SU(3)-flavour symmetry breaking
in the correlation functions used to calculate form factors of pseudoscalar
mesons in the QCD light-cone sum rule approach. It is shown that the Ward
identities for these correlation functions yield relations between twist-4 two-
and three-particle distribution amplitudes. In addition to the relations
already obtained from the QCD equations of motions, we have found a new one.
With the help of these relations, the twist-4 contribution to the light-cone
sum rule for the pion electromagnetic form factor is reduced to a very simple
form. Simultaneously, we correct a sign error in the earlier calculation. The
updated light-cone sum rule prediction for the pion form factor at intermediate
momentum transfers is compared with the recent Jefferson Lab data. Furthermore,
from the correlation functions with strange-quark currents the kaon
electromagnetic form factor and the $K\to \pi$ weak transition form factors are
predicted with $O(m_s)\sim O(m_K^2)$ accuracy.


title:
Problems of QCD factorization in exclusive decays of B meson to
  charmonium

abstract:
  We study the exclusive decays of $B$ meson into P-wave charmonium states
$\chi_{cJ}(J=0,1)$ in the QCD factorization approach with light-cone
distribution functions describing the mesons in the processes. For $B \to
\chi_{c1} K$ decay, we find that there are logarithmic divergences arising from
nonfactorizable spectator interactions even at twist-2 order and the decay rate
is too small to accommodate the experimental data. For $B\to \chi_{c0} K$
decay, we find that aside from the logarithmic divergences arising from
spectator interactions at leading-twist order, more importantly, the
factorization will break down due to the infrared divergence arising from
nonfactorizable vertex corrections, which is independent of the specific form
of the light-cone distribution functions. Our results may indicate that QCD
factorization in the present form may not be safely applied to $B$-meson
exclusive decays to charmonium states.


title: Soft and hard QCD in charmonium production

abstract:
  Hard and soft QCD dynamics are both important in charmonium hadroproduction,
as presented here through a next-to-leading order QCD matrix element
calculation combined with the colour evaporation model. Observed $x_F$ and
$p_\perp$ distributions of $J/\psi$ in hadroproduction are reproduced. Quite
similar results can also be obtained with a Monte Carlo event generator where
\ccbar pairs are instead produced through leading order matrix elements and the
parton shower approximation of higher order processes. The soft dynamics may
alternatively be described by the soft colour interaction model. We also
discuss the relative rates of different charmonium states and introduce an
improved model for mapping the continuous ccbar mass spectrum on the physical
charmonium resonances.


title: Prompt J/psi production from Tevatron to LHC

abstract:
  Models with essential non-perturbative QCD dynamics and describing Tevatron
data on high-$p_\perp$ charmonium are extrapolated to give predictions of
prompt J/psi production at the LHC. Differences of up to an order of magnitude
occurs. An important point is here the treatment of higher order perturbative
QCD effects.


title: Improved mapping of ccbar onto charmonium states

abstract:
  We discuss the relative rates of different charmonium states and introduce an
improved model for mapping the continuous ccbar mass spectrum on the physical
charmonium resonances.


title: Randall-Sundrum black holes and strange stars

abstract:
  It has recently been suggested that the existence of bare strange stars is
incompatible with low scale gravity scenarios. It has been claimed that in such
models, high energy neutrinos incident on the surface of a bare strange star
would lead to catastrophic black hole growth. We point out that for the flat
large extra dimensional case, the parts of parameter space which give rise to
such growth are ruled out by other methods. We then go on to show in detail how
black holes evolve in the the Randall-Sundrum two brane scenario where the
extra dimensions are curved. We find that catastrophic black hole growth does
not occur in this situation either. We also present some general expressions
for the growth of five dimensional black holes in dense media.


title:
Gauge Origin of Baryon Number Conservation and Suppressed Neutrino
  Masses From Five Dimensions

abstract:
  We consider a 5D SUSY $SU(3)_c\times SU(2)_L\times U(1)_Y\times {\cal U}(1)$
model compactified on an $S^{(1)}/Z_2$ orbifold. To cancel anomalies arising
from the presence of ${\cal U}(1)$, we employ a Chern-Simons term and also
chiral fields which could reside on the brane or in the bulk depending on the
model. The presence of ${\cal U}(1)$ symmetry leads to baryon number
conservation, gives rise to matter parity, and permits satisfactory neutrino
masses and mixings even for a low fundamental scale. The brane Fayet-Iliopoulos
D-terms naturally break ${\cal U}(1)$, leaving N=1 SUSY unbroken in 4
dimensions.


title:
Initial-State Interactions and Single-Spin Asymmetries in Drell-Yan
  Processes

abstract:
  We show that the initial-state interactions from gluon exchange between the
incoming quark and the target spectator system lead to leading-twist
single-spin asymmetries in the Drell-Yan process. The QCD initial-state
interactions produce a $T-$odd spin-correlation between the target spin and the
virtual photon production plane which is not power-law suppressed in the
Drell-Yan scaling limit. The origin of the single-spin asymmetry in $\pi
p^\uparrow \to \ell^+ \ell^- X$ is a phase difference between two amplitudes
coupling the proton target with $J^z_p = \pm {1\over 2}$ to the same
final-state, the same amplitudes which are necessary to produce a nonzero
proton anomalous magnetic moment. The calculation requires the overlap of
target light-front wavefunctions differing by one unit of orbital angular
momentum projection $L_z;$ thus the SSA in the Drell-Yan reaction provides a
direct measure of orbital angular momentum in the QCD bound state. The
single-spin asymmetry predicted for the Drell-Yan process $\pi p^\uparrow \to
\ell^+ \ell^- X$ is similar to the single-spin asymmetries in deep inelastic
semi-inclusive leptoproduction $\ell p^\uparrow \to \ell' \pi X$ which arises
from the final-state rescattering of the outgoing quark.


title: Strange Hadron Resonances: Freeze-Out Probes in Heavy-Ion Collisions

abstract:
  Hyperon resonances are becoming an extremely useful tool allowing the study
of the properties of hadronic fireballs made in heavy ion collisions. Their
yield, compared to stable particles with the same quark composition, depends on
hadronization conditions. The resonance's short lifetime makes them ideal
probes of the fireball chemical freeze-out mechanisms. An analysis of resonance
abundance in heavy ion collisions should be capable of distinguishing between
possible hadronization scenarios, in particular between sudden and gradual
hadronization. In this paper, we review the existing SPS and RHIC experimental
data on resonance production in heavy ion collisions, and discuss in terms of
both thermal and microscopic models the yields of the two observed resonances,
K* and Lambda(1520). We show how freeze-out properties, namely chemical
freeze-out temperature and the lifetime of the interacting hadron phase which
follows, can be related to resonance yields. Finally, we apply these methods to
SPS and RHIC measurements, discuss the significance and interpretations of our
findings, and suggest further measurements which may help in clarifying
existing ambiguities.


title: Studying CP Violation -- Chances for a New Alliance

abstract:
  The last three years have seen a phase transition in our knowledge about CP
violation: (i) Direct CP violation has been established in $K_L \to \pi \pi$.
(ii) The first CP violation outside $K_L$ decays has been observed in $B_d \to
\psi K_S$: $<{\rm sin}2\phi_1 > = 0.78 \pm 0.08$ in amazing agreement with the
prediction from the CKM description. The latter is thus seen as a tested
theory. This increase in knowledge is not matched by progress in understanding.
Searches for further manifestations of CP and T violation are mandatory. It is
argued that one can profit greatly from studying atoms, molecules and nuclei.


title:
Diffractive production and the total cross section in deep inelastic
  scattering

abstract:
  We explore the consequences for diffractive production, gamma* p --> X p, in
deep inelastic scattering at low values of x\sim Q^2/W^2 <<1 that follow from
our recent representation of the total photoabsorption cross section,
sigma_{gamma* p}, in the generalized vector dominance/ color dipole
picture(GVD/CDP) that is based on the generic structure of the
two-gluon-exchange from QCD. Sum rules are derived that relate the transverse
and the longitudinal (virtual) photoabsorption cross section to diffractive
forward production of q q-bar states that carry photon quantum numbers
("elastic diffraction"). Agreement with experiment in the W^2 and Q^2
dependence is found for M_X^2/Q^2<<1, where M_X is the mass of the produced
system X. An additional component ("inelastic diffraction"), not actively
contributing to the forward Compton amplitude, is needed for diffractive
production at high values of M_X. Our previous theoretical representation of
the total photoabsorption cross section sigma_{gamma* p}=sigma_{gamma* p}(eta),
in terms of the scaling variable eta=(Q^2+m_0^2)/Lambda^2(W^2) is extended to
include the entire kinematic domain, x=<0.1 and all Q^2 with Q^2>=0, where
scaling in eta holds experimentally.


title:
Tetraquark bound states in a constituent quark model and the nature of
  the a_0(980) and f_0(980)

abstract:
  In this work we study tetraquark bound states in the framework of the
constituent quark model of Ref. [2], which has been used for the description of
non-strange two- and three-baryon systems and later on applied to the hadron
spectra.


title:
Uncertainties on the measurements of the top mass at a future E+E-
  collider

abstract:
  The uncertainties due to limited knowledge of the multi-hadron final state on
the measurements of the top mass at future linear colliders are discussed. The
study is performed for E+E- -> tt-bar annihilation events at the centre-of-mass
energy of 500 GeV using Monte Carlo models tuned to LEP experiments. The
uncertainties are determined for the all hadronic top-decay mode as well as for
the lepton-plus-jets channel.


title: Cosmic scalar fields with flat potential

abstract:
  The dynamics of cosmic scalar fields with flat potential is studied. Their
contribution to the expansion rate of the universe is analyzed, and their
behaviour in a simple model of phase transitions is discussed.