title: Quo Vadis Strangeness? Strangeness - Open Questions

abstract:
  The study of strange and also charmed hadronic particle production in nuclear
relativistic collisions offers an opportunity to explore the physical
properties of the deconfined quark-gluon phase. We survey the recent
accomplishments and the future directions of this research program.


title: Diffractive production of charm and gluon nuclear shadowing

abstract:
  We evaluate nuclear shadowing of the total cross section of charm particles
production in DIS within the framework of the Gribov theory of nuclear
shadowing using as input the recent QCD Pomeron parton density analysis of the
HERA diffractive data. Assuming that the QCD factorization theorem is
applicable to the charm production off nuclei we also calculate shadowing of
the gluon densities in nuclei and find it sufficiently larg for heavy nuclei:
$G_{A\sim 200}(x,Q^2)/AG_N(x,Q^2) \sim 0.45-0.5 \cdot (A/200)^{-0.15}$ for $x
\sim 10^{-3\div -4}, Q^2 \sim 10 \div 40 GeV^2$ to influence significantly the
physics of heavy ion collisions at LHC. We also discuss some properties of the
final states for $\gamma^*A $ processes dominated by the scattering off small
$x$ gluons like the high $p_t$ jet and charm production.


title: Chemical Nonequilibrium in High Energy Nuclear Collisions

abstract:
  Strange particles produced in S-Au/W/Pb 200 A GeV and Pb-Pb 158 A GeV
reactions are described invoking final hadronic phase space in thermal
equilibrium, but allowing chemical non-equilibrium. Several sets of statistical
freeze-out parameters are obtained for each system, invoking different models
of dense matter. We show that only when allowing for strange and non-strange
flavor abundance non-equilibrium, a statistically significant description of
the experimental results is obtained. Physical properties of the fireball at
chemical freeze-out condition are evaluated and considerable universality of
hadron freeze-out between the two different collision systems is established.
The relevance of the Coulomb effect in the highly charged Pb-Pb fireballs for
the chemical analysis are discussed. The influence of explosive collective
matter flow is also described.


title: Indirect Measurement of the Vertex and Angles of the Unitarity Triangle

abstract:
  The precise measurements of the Bd oscillation frequency and the limit on the
Bs one one as well as the determination of the Cabibbo-Kobayashi-Maskawa matrix
element Vub improve the constraints on the other elements of this matrix.
  A fit to the experimental data and the theory calculations leads to the
determination of the vertex of the unitarity triangle as:
  rho = 0.160 -0.070 +0.094 eta = 0.381 -0.058 +0.061.
  The values of its angles, in their customary definition in terms of sines for
alpha and beta, are found to be:
  sin(2 alpha) = 0.06 -0.42 +0.35 sin(2 beta) = 0.75 +/- 0.09 gamma = 68
-12+11o.
  Indirect information on non-perturbative QCD parameters, on the presence of a
CP violating complex phase in the CKM matrix and on the Bs oscillation
frequency are also extracted.


title:
Cosmological Moduli Problem and Oscillating Inflation in Gauge-Mediated
  Supersymmetry Breaking

abstract:
  We investigate cosmological moduli problem in the gauge-mediated
supersymmetry breaking (GMSB). A mini-inflation (oscillating inflation) takes
place when a scalar field corresponding to the flat direction in GMSB
oscillates along the logarithmic potential induced by the gauge-mediation
mechanism. It is shown that this oscillating inflation can sufficiently dilute
the relic abundance of the string moduli for some ranges of parameters in the
GMSB models.


title: Gamma-Ray Bursts and Dark Matter - a joint origin?

abstract:
  A scenario is presented where large quark-gluon plasma (QGP) objects escaping
the quark-hadron transition in the early Universe account for the baryonic dark
matter as well as act as the sources for gamma-ray bursts. Two basic
assumptions are made. Firstly, we assume that a QGP consisting of u,d and s
quarks is the absolute ground state of QCD and secondly, that the quark-hadron
transition in the early Universe was of first order. Both particle physics and
astrophysics constraints are discussed, mainly from an observational point of
view.


title: Possible New Physics Signals in b -> s gamma and b -> s l^+ l^-

abstract:
  We consider possible new physics contributions to b\to s l^+ l^- assuming the
new physics modifies (chromo)magnetic and electric form factors in b\to s
\gamma^* and b\to s g with the same chirality structure as in the standard
model. Parametrizing the new physics effects on b\to s \gamma^* and b\to s g in
terms of four real parameters, one finds that there are enough region of
parameter space in which the measured branching ratio for B \to X_s \gamma can
be accomodated, and the predicted CP violation effect could be as large as \sim
30%. Moreover, the branching ratio and the forward-backward asymmetry of a
lepton in B \to X_s l^+ l^- and the tau polarization asymmetry in B \to X_s
\tau^+ \tau^- can be deviated from the SM predictions by a factor of \sim 2,
which can be accessible at B factories. We also discuss these observables in a
specific class of supersymmetric models with gluino-mediated flavor changing
neutral current (FCNC).


title: Weak Radiative Hyperon Decays and Vector Meson Dominance

abstract:
  We study the question whether the phenomenologically successful VMD approach
to weak radiative hyperon decays can be made consistent with Hara's theorem and
still yield the pattern of asymmetries exhibited by experimental data. It
appears that an essential ingredient which governs the pattern of asymmetries
is the off-shell behaviour of the input electromagnetic 1/2^- 1/2^+ \gamma
couplings. Although this behaviour can be chosen in such a way that the
experimentally observed pattern is obtained, and yet Hara's theorem satisfied,
at the same time the approach yields a definite prediction for the size of weak
meson-nucleon coupling constants. Comparison with experiment reveals then
another conflict.


title: Exclusive Decays of Charm and Beauty

abstract:
  Exclusive decays of B and D mesons are discussed with the focus on the
theoretical problem how to calculate the relevant hadronic matrix elements of
weak operators in the framework of QCD sum rules. The three lectures are
devoted to
  1. leptonic decays and decay constants
  2. semileptonic decays and form factors
  3. nonleptonic decays and nonfactorizable amplitudes.
  I shall introduce some of the basic concepts, describe various calculational
techniques, and illustrate the numerical results. The latter are compared with
lattice and quark model predictions and, where possible, with experimental
data. Applications include the determination of V_{ub} from B -> \pi \bar{l}
\nu_l and B -> \rho \bar{l} \nu_l, and an estimate of the phenomenological
coefficient a_2 for B -> J/\psi K.


title:
Semileptonic charm decay as a test for the spectator model in the
  $B_c$-meson

abstract:
  The $b$ and the $c$ quark compete with each other in decays of the
$B_c$-meson. We emphasize the need of obtaining reliable signals of $c \to s$
in order to assess the merits of the spectator approximation in calculating the
relative strengths of the two types of decays. This, we argue, can be done by
considering the decay $B_c \to B_s (B_s^*) l \bar{\nu_l}$, followed by
semileptonic decays of the $B_s$. We suggest looking for like-sign dileptons
together with a $D_s$ at the BTeV or LHC-B experiments, and show that such
signals can be made background-free by suitable event selection.


title:
Diffractive charm jet production at hadron colliders in the two-gluon
  exchange model

abstract:
  We present a calculation of diffractive charm jet production at hadron
colliders in perturbative QCD based on the two-gluon exchange model. Differing
from the previous calculations, we abandon the use of the effective
color-singlet vitual gluon simplification, and use the real gluon in the
calculations for the partonic process. We find the final result is free of the
linear singularities due to the small transverse momenta of the exchanged two
gluons. In the leading logarithmic approximation (LLA) in QCD, this process is
related to the off-diagonal gluon density in the proton. As a result, this
process may provide a wide window for testing the two-gluon exchange model, and
may be particularly useful in studying the small $x$ physics. In comparison,
the diffractive bottom jet production is also discussed, and is found to be
important only for large transverse momentum of the jet.


title: On source parameters from particle correlations and spectra

abstract:
  Analytic and numeric approximations are studied in detail for a hydrodynamic
parameterization of single-particle spectra and two-particle correlation
functions in high energy hadron-proton and heavy ion reactions. Two very
different sets of model parameters are shown to result in similarly shaped
correlation functions and single particle spectra in a rather large region of
the momentum space. However, the absolute normalization of the single-particle
spectra is found to be highly sensitive to the choice of the model parameters.
For data fitting the analytic formulas are re-phrased in terms of parameters of
direct physical meaning, like mean transverse flow. The difference between the
analytic and numeric approximations are determined as an analytic function of
source parameters.


title:
Neutrino pair production by a virtual photon in an external magnetic
  field

abstract:
  Production of a massive neutrino-antineutrino pair by a virtual polarized
photon in the Weiberg-Salam model with mixing is studied. The rate of the
neutrino production by photons with various polarizations is found at values of
the magnetic field intensity lower than critical.


title:
On the heavy quark mass expansion for the operator Qbar gamma_5 Q and
  the charm content of eta, eta'

abstract:
  Recently in the context of studies of the intrinsic charm content of the
nucleon and of the eta' meson two groups have arrived at different results for
the 1/m^3 term of the heavy quark expansion for operator $\bar Q\gamma_5Q$
differing by the factor of six. We show that the form of both results violates
certain general conditions. Using the expression for the axial anomaly with the
finite Pauli-Villars regularization we obtain a new expression for 1/m^3 term
of the heavy quark expansion for $\bar Q\gamma_5 Q$. With this new result we
obtain an estimate for the constant f_{\eta'}^{(c)}=-2 MeV.


title:
Violation of SUSY equivalence in triple gauge boson and gaugino
  couplings

abstract:
  Supersymmetry implies that the trilinear couplings between gauge bosons and
gauginos are equal to all orders in perturbation theory. However if SUSY is
broken and some of the superpartners have large SUSY breaking masses then they
can induce non-decoupling deviations in this relation through radiative
corrections. In this article we show that the deviation in the ratio of triple
gauge to gaugino couplings from unity can be around 2.3% (3.3%) in heavy QCD
models (2-1 models). Precision measurements of triple gaugino couplings at
furture high energy colliders can therefore probe such violations and the
existence of heavy superparticles in the multi Tev region which would otherwise
be inaccessible.


title: On the double radiative decay of B_s-meson $B\to\gamma\gamma$

abstract:
  B_s-meson double radiative decay $B \to \gamma\gamma$ is investigated in
frame of supersymmetric extension of the standard model. The branching ratio is
calculated. It is shown that for light Higgs particle and heigh $\tan\beta$
supersymmetric contribution into branching ratio is significunt large than
standard model estimate.


title: Resonant states $^3 P$ channels of Charmonium

abstract:
  We employ QCD sum rules, implemented with two numerical algorithms already
tested in two different channels of Charmonium, in order to predict masses of
resonances just above the ground states in the $^3 P$ channels. We find that
such masses are above the threshold of open charm. We calculate also the
partial decay widths of the ground states into light hadrons and, for even
spins, into two gammas; we find consistency with data.


title: Relativistic Wigner Function Approach to Neutrino Propagation in Matter

abstract:
  In this work we study the propagation of massive Dirac neutrinos in matter
with flavor mixing, using statistical techniques based on Relativistic Wigner
Functions. First, we consider neutrinos in equilibrium within the Hartree
approximation, and obtain the corresponding relativistic dispersion relations
and effective masses. After this, we analyze the same system out of
equilibrium. We verify that, under the appropiate physical conditions, the well
known equations for the MSW effect are recovered. The techniques we used here
appear as an alternative to describe neutrino properties and transport
equations in a consistent way.


title: Transition rates for q q bar -> pi pi pi in a chiral model

abstract:
  We investigate the nature of transition rates for the hadronization process
of q q bar -> Pi Pi Pi as opposed to the transition rates for q q bar -> Pi Pi,
within the Nambu--Jona-Lasinio model that has manifest chiral symmetry. Feynman
diagrams appropriate to this process can be classified according to the
expansion in the inverse number of colors 1/N_c. Two of these types of graphs
are seen to be either 's-like' or 't-like' in nature. A further graph that
contains both s-like and t-like elements, and which is denoted as st-like, is
also present. To describe such a process with two incoming and three outgoing
particles, it is necessary to extend the number of Mandelstam invariants. It is
convenient to introduce seven such variables, of which only five are
independent. The cross section for two incoming particles to three outgoing
particles is then reexpressed in integral form in terms of these invariants. As
a function of sqrt s, the final expression is reduced to an integral over the
four remaining invariants. The limits of integration, which are now
non-trivial, are also discussed. The transition rate for the explicit case of u
u bar -> Pi^+ Pi^- Pi^0, is evaluated numerically, assuming non-chiral pions,
m_Pi = 135MeV. The rate for three pion production is found to be of the same
order of magnitude as for two pion production, making this a non-negligible
contribution to hadronization.


title: Influence of source evolution on particle correlations

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


title: The Renormalization Group Evolution of the CKM Matrix

abstract:
  We compute the renormalization of the complete CKM matrix in the MSbar scheme
and perform a renormalization group analysis of the CKM parameters. The
calculation is simplified by studying only the Higgs sector, which for the
\beta-function of the CKM matrix is at one loop the same as in the full
Standard Model. The renormalization group flow including QCD corrections can be
computed analytically using the hierarchy of the CKM parameters and the large
mass differences between the quarks. While the evolution of the Cabibbo angle
is tiny V_{ub} and V_{cb} increase sizably. We compare our results with the
ones in the full Standard Model.


title: A useful approximate isospin equality for charmless strange B Decays

abstract:
  A useful inequality is obtained if charmless strange B decays are assumed to
be dominated by a $\Delta I = 0$ transition like that from the gluonic penguin
diagram and the contributions of all other diagrams including the tree,
electroweak penguin and annihilation diagrams are small but not negligible. The
interference contributions which are linear in these other amplitudes are
included but the direct contributions which are quadratic are neglected.


title:
Testing CPT and Lorentz Symmetry with Neutral-Meson Oscillations and QED
  Experiments

abstract:
  This talk summarizes some theoretical features and experimental implications
of a general Lorentz-violating extension of the minimal SU(3) x SU(2) x U(1)
standard model that allows for both CPT-even and CPT-odd effects. The theory
would arise as the low-energy limit of a fundamental theory that is Lorentz and
CPT covariant but in which spontaneous Lorentz breaking occurs. The use of
neutral-meson oscillations and various QED systems to bound the apparent CPT
and Lorentz violations is described.


title: Low Energy Data and a Model of Flavor Mixing

abstract:
  We consider a model in which the third family fermions are subjected to an
SU(2) interaction different from the first two family fermions. Constrained by
the Z-pole data, the heavy gauge boson mass is bounded from below to be about
1.7 TeV at the $2\sigma$ level. In this model, the flavor mixing between $\tau$
and $\mu$ can be so large that $Br(\tau\to \mu \bar{\nu_\mu} \nu_\tau)/
Br(\tau\to e \bar{\nu_e} \nu_\tau)$ and $Br(\tau\to \mu \mu \mu)$ provide a
better constraint than the LEP/SLC data in some region of parameter space.
Furthermore, flavor-changing neutral currents are unavoidable in the quark
sector of the model. Significant effects to the $B^0-\bar{B^0}$ mixing and the
rare decays of the $K$ and $B$ mesons, such as $K^\pm \to \pi^\pm \nu {\bar
\nu}, b \to s \nu {\bar \nu}, B_s \to \tau^+\tau^-, \mu^+\mu^-$ and $B_{s,d}
\to \mu^\pm \tau^\mp$, are expected.


title:
Reason for the large scale differences in the results for the
  neutron-antineutron oscillation problem

abstract:
  It is shown that there is a double counting in the standard model of $n\bar
{n}$ mixing in the medium, resulting in full cancellation of leading terms. The
direct calculation of $n\bar{n}$ transition followed by annihilation is
performed. The lower limit for the free-space $n\bar{n}$ oscillation time is
$\tau_{n\bar{n}} \sim T_{n\bar{n}}>10^{16}y$, where $T_{n\bar{n}}$ is the
lifetime of neutron bound in a nucleus. This limit exceeds the previous one by
16 orders of magnitude.


title: Tritium Decay and the Hypothesis of Tachyonic Neutrinos

abstract:
  Numerous recent measurements indicate an excess of counts near the endpoint
of the electron energy spectrum in tritium decay. We show that this effect is
expected if the neutrino is a tachyon. Results of calculations, based on a
unitary (causal) theory of tachyons, are presented. The hypothesis of tachyonic
neutrinos also offers a natural explanation of the V-A structure of the weak
leptonic current in neutrino interactions.


title: Developments in Superstring Theory

abstract:
  In this talk I review recent developments in superstring theory. In the first
half of the talk I discuss some of the earlier developments in this subject.
This includes a review of the status of string theory as a unified theory of
gravity and other interactions, the role of duality in string theory, and
application of string theory to the problem of information loss near a black
hole. In the second half of the talk I review the developments of the last two
years. This includes application of duality symmetries, Matrix theory,
Maldacena conjecture, and derivation of gauge theory results from string
theory. In choosing the list of topics for this talk, I have focussed on those
which are likely to be of some interest to non-string theorists, thereby
leaving out many of the marvelous technical results in this subject.


title:
New explanation of the strange baryon rapidity distributions in
  ultra-relativistic nucleus-nucleus collisions

abstract:
  A model of multiparticle production in hadronic collisions at
ultra-relativistic energies, based on the assumption of independent string
fragmentation, reproduces the rapidity spectra of $\Lambda$ and $\bar{\Lambda}$
in sulphur-sulphur collisions reported by the NA35 Collaboration. This is
achieved after a reconsideration of the intermediate multi-string states and
the structure of the diquarks. Nuclear stopping power is also studied through
the computation of the $p-\bar{p}$ rapidity spectra.


title:
Decoupling of heavy-quark loops in light-light and heavy-light quark
  currents

abstract:
  Matching of light-light quark currents in QCD with a heavy flavour and in the
low-energy effective QCD is calculated in MSbar at two loops. Heavy-light HQET
currents are similarly considered.


title: Non-forward double Pomeron exchange in QCD

abstract:
  We derive the analytic expression of the two one-loop dipole contributions to
the elastic 4-gluon amplitude in QCD for arbitrary transverse momentum. The
first one corresponds to the double QCD pomeron exchange, the other to an order
$\alpha^2$ correction to one-pomeron exchange.


title:
Neutralino-Stau Coannihilation and the Cosmological Upper Limit on the
  Mass of the Lightest Supersymmetric Particle

abstract:
  We consider the effects of neutralino-stau coannihilations on the
cosmological relic density of the lightest supersymmetric particle (LSP) $\chi$
in the minimal supersymmetric extension of the Standard Model (MSSM),
particularly in the constrained MSSM in which universal supergravity inputs at
the GUT scale are assumed. For much of the parameter space in these models,
$\chi$ is approximately a U(1) gaugino ${\tilde B}$, and constraints on the
cosmological relic density $\Omega_{\tilde B} h^2$ yield an upper bound on the
bino mass. We show that in regions of parameter space for which the
cosmological bound is nearly saturated, coannihilations of the $\tilde B$ with
the stau, the next lightest sparticle, are important and may reduce
significantly the bino relic density. Including also bino coannihilations with
the selectrons and smuons, we find that the upper limit on $m_{\chi}$ is
increased from about 200 GeV to about 600 GeV in the constrained MSSM, with a
similar new upper limit expected in the MSSM.


title: WIMPZILLAS!

abstract:
  There are many reasons to believe the present mass density of the universe is
dominated by a weakly interacting massive particle (WIMP), a fossil relic of
the early universe. Theoretical ideas and experimental efforts have focused
mostly on production and detection of thermal relics, with mass typically in
the range a few GeV to a hundred GeV. Here, I will review scenarios for
production of nonthermal dark matter. Since the masses of the nonthermal WIMPS
are in the range 10^{12} to 10^{16} GeV, much larger than the mass of thermal
wimpy WIMPS, they may be referred to as WIMPZILLAS. In searches for dark matter
it may be well to remember that ``size does matter.''


title: Particle Physics in the Early Universe

abstract:
  Two introductory lectures on inflation and dark matter presented at the NATO
Advanced Study Institute on Techniques and Concepts of High-Energy Physics.


title: Adiabatic string shape for non-uniform rotation

abstract:
  It is well known that a straight Nambu-Goto string is an exact solution of
the equations of motion when its end moves in a circular orbit. In this paper
we investigate the shape of a confining relativistic string for a general
motion of its end. We determine analytically the shape of the curved string to
leading order in deviation from straightness, and show that it reduces to an
expected non-relativistic result. We also demonstrate numerically that in
realistic meson models this deviation is always small. We further find that the
angular momentum and energy are the same as for the straight string, but that
the curved string has a small radial momentum not present in a straight string.
Our results justify the common assumption of straight strings usually made in
hadron models.


title: J/psi Production at LEP: Revisited and Resummed

abstract:
  We present the leading order differential and total rates for J/\psi
production at LEP. By leading order we mean all terms of the form
alpha_s[alpha_s log(M_Z^2/M_{psi}^2)]^n and alpha_s^{n+1} log^l(z^2)
log^m(M_Z^2/M_{psi}^2), (l+m=2n-1), in the regions z=2E_psi/M_Z ~ O(1) and z <<
1, respectively. In the intermediate region we interpolate using the available
data. This resummation eliminates the O[alpha_s(M_psi)/alpha_s(M_Z)]~ 2
theoretical uncertainties in previous calculations. The log(z) resummation
results in a suppression of the small z region due to coherent gluon emission.
Comparing the zeroth moment with the LEP data we find the value for the
effective octet matrix element to be <\hat O_8^{\psi}(^3S_1)>=0.019 GeV^3. The
theoretical uncertainties are substantially smaller than those from Tevatron
extractions. Using this value of the octet matrix element we make a prediction
for the first moment of the differential rate and find that the resummed
differential decay rate is in much better agreement with preliminary data than
the color singlet result or the unresummed color octet prediction.


title: The Status of CPT

abstract:
  A short review is given of some theoretical approaches to CPT violation. A
potentially realistic possibility is that small apparent breaking of CPT and
Lorentz symmetry could arise at the level of the standard model from
spontaneous symmetry breaking in an underlying theory. Some experimental
constraints are described.


title:
B decays into two light pseudoscalar mesons and possible effects of
  enhanced b --> s g

abstract:
  We consider the branching ratios and CP asymmetry in the B meson decays into
two pseudoscalar mesons in the generalized factorization approximation. We also
investigate the possible effects of the enhanced chromomagnetic interaction b
--> s g on these exclusive B meson decays that was suggested as a possible
solution to the semileptonic branching ratio of B mesons, the missing charm
puzzle and the large B --> \eta^{'} + X_s. We finds that such enhanced b --> s
g interaction degrades the agreement between the data and the model predictions
for B meson decays into two light mesons in the generalized factorization
approximation.


title: New Method for Detecting Charged (Pseudo-)Scalars at Colliders

abstract:
  We propose a new method for detecting a charged (pseudo-)scalar at colliders,
based upon the observation that its Yukawa coupling to charm and bottom quarks
can be large due to a significant mixing of the top and charm quarks. After
analyzing the typical flavor mixing allowed by low energy data in the topcolor
and the generic two-Higgs doublet models, we study the physics potential of the
Tevatron, LHC, and linear colliders for probing such an s-channel charged
resonance via the single-top (as well as Wh^0) production. We show that
studying its detection at colliders can also provide information on the
dynamics of flavor-changing neutral current phenomena.


title:
Evolution of Structure Functions with Jacobi Polynomial: Convergence and
  Reliability

abstract:
  The Jacobi polynomial has been advocated by many authors as a useful tool to
evolve non-singlet structure functions to higher $Q^2$. In this work, it is
found that the convergence of the polynomial sum is not absolute, as there is
always a small fluctuation present. Moreover, the convergence breaks down
completely for large $N$.


title:
Decay Constants $f_{D_s^*}$ and $f_{D_s}$ from ${\bar{B}}^0\to D^+ l^-
  {\bar{\nu}}$ and ${\bar{B}}^0\to D^+ D_s^{-(*)}$ Decays

abstract:
  We calculate the decay constant of $D_s$ and $D_s^{*}$ with $\bar{B}^0 \ra
D^{+}\ell^{-}\nu$ and $\bar{B}^0 \ra D^{+}D_s^{-(*)}$ decays. In our analysis
we assume that factorization ansatz works and used two different form factor
behaviours (constant and monopole-type) for $F_0(q^2)$. We also consider the
QCD-penguin contributions in hadronic decays within the NDR renormalization
scheme at NLO calculation.
  We estimate the decay constant of the $D_s$ meson to be $219\pm46 MeV$ for
(pole/pole)-type form factor and $239\pm50$ $MeV$ for (pole/constant)-type form
factor. For $D_s^{*}$ meson, we predict $f_{D_s^{*}} = 336 \pm 79 MeV$, and
$f_{D_s^{*}}/f_{D_s} = 1.41 \pm 0.41$ for (pole/constant)-type form factor.


title: Vector-Meson Electroproduction from Generalized Vector Dominance

abstract:
  Including destructively interfering off-diagonal transitions of
diffraction-dissociation type, we arrive at a formulation of GVD for exclusive
vector-meson production in terms of a continuous spectral representation of
dipole form. The transverse cross-section sigma_T for gamma* p -> V p behaves
asymptotically as 1/Q^4, while R_V = sigma_L/sigma_T becomes asymptotically
constant. Contributions violating s-channel helicity conservation stay at the
10-15% level established in low-energy photoproduction and diffractive
hadron--hadron interactions. The data for phi- and rho-meson production for 0
\lsim Q^2 \lsim 20 GeV^2 from HERA are found to be in agreement with these
predictions.


title:
Basis independent study of Supersymmetry without R-parity and the tau
  neutrino mass

abstract:
  In the most general R-parity violating model, including both bilinear and
trilinear terms, the sneutrino receives a vacuum expectation value. We
investigate the constraints on this vev following a basis independent approach,
highlighting the relations between the three most popular basis. We study the
prediction for the tau neutrino mass which follows from the minimization of the
scalar potential in a SUGRA model with universality of the soft parameters at
the GUT scale. Finally we show that the tau neutrino mass controls the R-parity
violating effects both in the fermionic and scalar sectors.


title: Dilatonic Dark Matter and Unified Cosmology -- a New Paradigm --

abstract:
  We study the possibility that the dilaton -- the fundamental scalar field
which exists in all the existing unified field theories -- plays the role of
the dark matter of the universe. We find that the condition for the dilaton to
be the dark matter strongly restricts its mass to be around 0.5 keV or 270 MeV.
For the other mass ranges, the dilaton either undercloses or overcloses the
universe. The 0.5 keV dilaton has the free-streaming distance of about 1.4 Mpc
and becomes an excellent candidate of a warm dark matter, while the 270 MeV one
has the free-streaming distance of about 7.4 pc and becomes a cold dark matter.
We discuss the possible ways to detect the dilaton experimentally


title:
Generalized Gordon Identities, Hara Theorem and Weak Radiative Hyperon
  Decays

abstract:
  It is shown that an alternative form of the parity-nonconserving (PNC)
transition electromagnetic current resolves partly a puzzle with the Hara
theorem. New formulation of it has allowed PNC weak radiative hyperon
transitions of the charged hyperons $\Sigma^{+} \Rightarrow p + \gamma $ and
$\Xi^{-} \Rightarrow \Sigma^{-} + \gamma $ revealing hitherto unseen transition
toroid dipole moment.


title: Naturalness Implications of LEP Results

abstract:
  We analyse the fine-tuning constraints arising from absence of superpartners
at LEP, without strong universality assumptions. We show that such constraints
do not imply that charginos or neutralinos should have been seen at LEP,
contrary to the usual arguments. They do however imply relatively light gluinos
$(m_{\tilde g} \lsim 350 GeV)$ and/or a relation between the soft-breaking
SU(3) gaugino mass and Higgs soft mass $m_{H_U}$. The LEP limit on the Higgs
mass is significant, especially at low $\tan \beta$, and we investigate to what
extent this provides evidence for both a lighter gluino and correlations
between soft masses.


title:
Search for New Physics in $D^\pm \to K_S X^{\pm} $ and $D^\pm \to K_S
  K_S K^{\pm}$

abstract:
  Direct CP violation beyond the standard model can be produced in charged D
decays to final states with a $K_S$ by small new physics contributions to the
transitions $D^+ \to K^o X^+$, where $X^+$ denotes any positively charged
hadronic state or transitions $D^+ \to K^o \bar K^o K^{(*)+}$, where $K^{(*)+}$
denotes any positive strange state. These transitions are doubly-Cabibbo
suppressed and color suppresed in the standard model and branching ratios are
experimentally observed to be suppressed by two orders of magnitude relative to
the allowed $D^+ \to \bar K^o X^+$ or $D^+ \to \bar K^o \bar K^o K^{(*)+}$,
branching ratio. An even smaller new physics contribution might produce an
observable CP asymmetry in $D^\pm \to K_S X^\pm$ or $D^{\pm} \to K_S K_S
K^{(*)\pm}$ decays. Since such asymmetries are easily checked in the early
stages of any charm production experiment, it seems worth while to check them
before the opportunity is lost in later stages of the analysis, even if no
theoretical model predicts such an asymmetry.


title:
Light Quark Mass Difference and Isospin Breaking In Electromagnetic Pion
  Production

abstract:
  It is demonstrated that there is a dynamic isospin breaking effect in the
near threshold $\gamma^{*} N\to \pi N$ reaction due to the mass difference of
the up and down quarks, which also causes isospin breaking in the $\pi N$
system. The photopion reaction is affected through final state $\pi N$
interactions (formally implemented by unitarity and time reversal invariance).
It is also demonstrated that the near threshold $\gamma \vec{N} \to \pi N$
reaction is a practical reaction to measure isospin breaking in the $\pi N$
system, which was first predicted by Weinberg about 20 years ago but has never
been experimentally tested.


title: Initial Value Problems in Quantum Field Theory

abstract:
  We review our work on initial value problems in Quantum Field Theory which is
based on using Schwinger's Closed Time Path formalism and a large-N expansion
of the Path Integral.


title: Inverse Slope Systematics in High-Energy p+p and Au+Au Reactions

abstract:
  We employ the Monte-Carlo PYTHIA to calculate the transverse mass spectra of
various hadrons and their inverse slopes T* at m_T-m=1.5-2 GeV in p+p reactions
at sqrt(s)=200 GeV. Due to (multiple) minijet production T* increases as a
function of the hadron mass. Moreover, the T*(m) systematics has a
``discontinuity'' at the charm threshold, i.e. the inverse slope of D-mesons is
much higher than that of non-charmed hadrons and even of the heavier Lambda_C
baryon. The experimental observation of this characteristic behaviour in Au+Au
collisions would indicate the absence of c-quark rescattering. In contrast, the
assumption of thermalized partons and hydrodynamical evolution would lead to a
smoothly increasing T*(m), without discontinuity at the charm threshold. The
degree of collective transverse flow, indicated by the slope of the T*(m)
systematics, depends strongly on whether kinetic equilibrium is maintained for
some time after hadronization or not.


title: Dilatonic Dark Matter

abstract:
  We study the possibility that the dilaton plays the role of the dark matter
of the universe. We find that the condition for the dilaton to be the dark
matter of the universe strongly restricts its mass to be around 0.5 keV or 270
MeV. For the other mass ranges, the dilaton either undercloses or overcloses
the universe. The 0.5 keV dilaton has the free-streaming distance of about 1.4
Mpc and becomes an excellent candidate of a warm dark matter, while the 270 MeV
one has the free-streaming distance of about 7.4 pc and becomes a cold dark
matter. We discuss the possible ways to detect the dilaton experimentally.


title: Flavor Asymmetry of the Sea Quarks in the Baryon Octet

abstract:
  We show that the chiral $SU(n)\otimes SU(n)$ flavor symmetry on the
null-plane severely restricts the sea quarks in the baryon octet. It predicts
large asymmetry for the light sea quarks $(u,d,s)$, and universality and
abundance for the heavy sea quarks. Further it is shown that existence of the
heavy sea quarks constrained by the same symmetry reduces the theoretical value
of the Ellis-Jaffe sum rule substantially.


title: Information Content in $B \to VV$ Decays and the Angular Moments Method

abstract:
  The time-dependent angular distributions of decays of neutral $B$ mesons into
two vector mesons contain information about the lifetimes, mass differences,
strong and weak phases, form factors, and CP violating quantities. A
statistical analysis of the information content is performed by giving the
``information'' a quantitative meaning. It is shown that for some parameters of
interest, the information content in time and angular measurements combined may
be orders of magnitude more than the information from time measurements alone
and hence the angular measurements are highly recommended. The method of
angular moments is compared with the (maximum) likelihood method to find that
it works almost as well in the region of interest for the one-angle
distribution. For the complete three-angle distribution, an estimate of
possible statistical errors expected on the observables of interest is
obtained. It indicates that the three-angle distribution, unraveled by the
method of angular moments, would be able to nail down many quantities of
interest and will help in pointing unambiguously to new physics.


title: Improved bounds on SUSY accompanied neutrinoless double beta decay

abstract:
  Neutrinoless double beta decay induced by light Majorana neutrino exchange
between two decaying nucleons with squark/slepton exchange inside one and W
exchange inside the other nucleon (so-called vector-scalar exchange) gives
stringent limits on R-parity violating interactions. We have extended previous
work by including the tensor contribution to the transition rate. We discuss
the improved limits on trilinear \Rp -MSSM couplings imposed by the current
experimental limit on the $\znbb$ decay half-life of $^{76}$Ge.


title: Fractals at T=Tc due to instanton-like configurations

abstract:
  We investigate the geometry of the critical fluctuations for a general system
undergoing a thermal second order phase transition. Adopting a generalized
effective action for the local description of the fluctuations of the order
parameter at the critical point ($T=T_c$) we show that instanton-like
configurations, corresponding to the minima of the effective action functional,
build up clusters with fractal geometry characterizing locally the critical
fluctuations. The connection between the corresponding (local) fractal
dimension and the critical exponents is derived. Possible extension of the
local geometry of the system to a global picture is also discussed.


title: Hadronic interactions models beyond collider energies

abstract:
  Studies of the influence of different hadronic models on extensive air
showers at ultra-high energies are presented. The hadronic models considered
are those implemented in the well-known QGSJET and SIBYLL event generators. The
different approaches used in both codes to model the underlying physics is
analyzed using computer simulations performed with the program AIRES. The most
relevant observables for both single collisions and air showers are studied for
primary energies ranging from $10^{14}$ eV up to $10^{20.5}$ eV. In addition,
the evolution of lateral and energy distributions during the shower development
is presented. Our analysis seems to indicate that the behaviour of shower
observables does not largely reflect the strong differences observed in single
collisions.


title:
Important configurations for NN processes in a Goldstone boson exchange
  model

abstract:
  We study the short-range nucleon-nucleon interaction in a nonrelativistic
chiral constituent quark model by diagonalizing a Hamiltonian containing a
linear confinement and a Goldstone boson exchange interaction between quarks. A
finite six-quark basis obtained from single particle cluster model states was
previously used. Here we show that the configurations which appear naturally
through the use of molecular orbitals, instead of cluster model states, are
more efficient in lowering the six-quark energy.


title: Scalar Mesons and Multichannel Amplitudes

abstract:
  Properties of scalar-isoscalar mesons are analysed using separable
interactions in three decay channels: pion-pion, kaon-antikaon and an effective
2pion-2pion. We obtain different solutions by fitting various data on the
pion-pion and kaon-antikaon phase shifts and inelasticities including the
CERN-Cracow-Munich measurements of the pion- p --> pion+ pion- n reaction on a
polarized target. Analytical structure of the meson-meson multichannel
amplitudes is studied with a special emphasis on the role played by the
S-matrix zeroes. S-matrix poles are found in the complex energy plane and
interpreted as scalar resonances. We see a wide f0(500), a narrow f0(980) and a
relatively narrow f0(1400). In one solution a resonance at about 1700 MeV is
also found. Total, elastic and inelastic channel cross sections, branching
ratios and coupling constants are evaluated and compared with data. We
construct approximation to our model and show that the Breit-Wigner approach
has a limited phenomenological applicability.


title: Current Status of the Solar Neutrino Problem with Super-Kamiokande

abstract:
  We perform an updated model-independent analysis using the latest solar
neutrino data obtained by $^{37}$Cl and $^{71}$Ga radiochemical experiments,
and most notably by a large water-Cherenkov detector SuperKamiokande with their
504 days of data taking. We confirm that the astrophysical solutions to the
solar neutrino problem are extremely disfavored by the data and a
low-temperature modification of the standard solar model is excluded by more
than 5 $\sigma$. We also propose a new way of illuminating the suppression
pattern of various solar neutrino flux without invoking detailed flavor
conversion mechanisms. It indicates that the strong suppression of $^7$Be
neutrinos is no more true when the neutrino flavor conversion is taken into
account.


title: Agut Masses

abstract:
  From considerations of the number of matrix elements of different orders of
magnitude in the quark and charged lepton mass matrices, we suggest that the
underlying gauge group responsible for the spectrum should have
several---actually of the order of 7 to 10---cross product factors. This is
taken to support our AGUT gauge group $SMG^3 \times U(1)_f$ which, under
certain simple conditions, is the maximal group transforming the known 45 Weyl
quark-lepton fields into each other. We describe the AGUT fit to the charged
fermion mass spectrum, and briefly discuss baryogenesis and the neutrino mass
problem.


title:
Collinear Factorization and Splitting Functions for
  Next-to-next-to-leading Order QCD Calculations

abstract:
  We consider the singular behaviour of tree-level QCD amplitudes when the
momenta of three partons become simultaneously parallel. We discuss the
universal factorization formula that controls the singularities of the
multiparton matrix elements in this collinear limit and present the explicit
expressions of the corresponding splitting functions. The results fully include
spin (azimuthal) correlations up to ${\cal O}(\as^2)$. In the case of
spin-averaged splitting functions we confirm similar results obtained by
Campbell and Glover.


title: Color and Spin in Quarkonium Production

abstract:
  I describe the NRQCD factorization approach to the inclusive production of
heavy quarkonium, contrasting it with the color-singlet and color evaporation
models. These approaches differ dramatically in their assumptions about the
roles played by color and spin in the production process. They also differ
dramatically in their predictions for the production of charmonium at large
transverse momentum.


title: The Fermion Mass Problem and the Anti-Grand Unification Model

abstract:
  We describe the Anti-Grand Unification Model (AGUT) and the Multiple Point
Principle (MPP) used to calculate the values of the Standard Model gauge
coupling constants in the theory, from the requirement of the existence of
degenerate vacua. The application of the MPP to the pure Standard Model
predicts the existence of a second minimum of the Higgs potential close to the
cut-off, which we take to be the Planck scale, giving our Standard Model
predictions for the top quark and Higgs masses: $M_t = 173 \pm 5$ GeV and $M_H
= 135 \pm 9$ GeV. We also discuss mass protection by chiral charges and present
a fit to the charged fermion mass spectrum using the chiral quantum numbers of
the maximal AGUT gauge group $SMG^3 \times U(1)_f$, where $SMG \equiv SU(3)
\times SU(2) \times U(1)$. The neutrino mass and mixing problem is then briefly
discussed for models with chiral flavour charges responsible for the charged
fermion mass hierarchy.


title: S_3 and the L=1 Baryons in the Quark Model and the Chiral Quark Model

abstract:
  The S_3 symmetry corresponding to permuting the positions of the quarks
within a baryon allows us to study the 70-plet of L=1 baryons without an
explicit choice for the spatial part of the quark wave functions: given a set
of operators with definite transformation properties under the spin-flavor
group SU(3) x SU(2) and under this S_3, the masses of the baryons can be
expressed in terms of a small number of unknown parameters which are fit to the
observed L=1 baryon mass spectrum. This approach is applied to study both the
quark model and chiral constituent quark model. The latter theory leads to a
set of mass perturbations which more satisfactorily fits the observed L=1
baryon mass spectrum (though we can say nothing, within our approach, about the
physical reasonableness of the parameters in the fit). Predictions for the
mixing angles and the unobserved baryon masses are given for both models as
well as a discussion of specific baryons.


title: Fermion Damping in a Fermion-Scalar Plasma

abstract:
  In this article we study the dynamics of fermions in a fermion-scalar plasma.
We begin by obtaining the effective in-medium Dirac equation in real time which
is fully renormalized and causal and leads to the initial value problem. For a
heavy scalar we find the novel result that the decay of the scalar into fermion
pairs in the medium leads to damping of the fermionic excitations and their
in-medium propagation as quasiparticles. That is, the fermions acquire a width
due to the decay of the heavier scalar in the medium. We find the damping rate
to lowest order in the Yukawa coupling for arbitrary values of scalar and
fermion masses, temperature and fermion momentum. An all-order expression for
the damping rate in terms of the exact quasiparticle wave functions is
established. A kinetic Boltzmann approach to the relaxation of the fermionic
distribution function confirms the damping of fermionic excitations as a
consequence of the induced decay of heavy scalars in the medium. A
linearization of the Boltzmann equation near equilibrium clearly displays the
relationship between the damping rate of fermionic mean fields and the fermion
interaction rate to lowest order in the Yukawa coupling directly in real time.


title: Selected Low-Energy Supersymmetry Phenomenology Topics

abstract:
  I review selected topics in supersymmetry, including: effects of
non-universality, high $\tanb$ and phases on SUSY signals; a heavy gluino as
the LSP; gauge-mediated SUSY signals involving delayed decays; R-parity
violation and the very worst case for SUSY discovery; some topics regarding
Higgs bosons in supersymmetry; and doubly-charged Higgs and higgsinos in
supersymmetric left-right symmetric models. I emphasize scenarios in which
detectionof supersymmetric particles and/or the SUSY Higgs bosons might require
special experimental and/or analysis techniques.


title:
A coupled channel unitary chiral approach to the meson-meson interaction
  and pion-pion scattering in a nuclear medium

abstract:
  A new tool which combines chiral perturbation theory and unitarity in coupled
channels is applied with success to the study of the meson-meson interaction,
extending the theoretical predictions up to sqrt{s} = 1.2 GeV, hence improving
considerably the convergence radius of conventional chiral perturbation theory.
The method is applied to obtain the meson-meson phase shifts and inelasticities
as well as the isoscalar pion-pion scattering amplitude inside a nuclear
medium.


title: Roper resonance in the relativistic three-quark model

abstract:
  The relativistic three-quark equations are found in the framework of the
dispersion relation technique. The approximate solutions of these equations
using the method based on the extraction of leading singularities of the
amplitude are obtained. The calculated mass values of two ($ N=2, 56^* $)
baryonic multiplets $ J^P ={{1/2}}^{+},{{3/2}}^{+} $ are in good agreement with
the experimental ones.


title:
SU(3) Analysis of Annihilation Contributions and CP Violating Relations
  in $B \to PP$ Decays

abstract:
  Several methods proposed to measure the angle $\gamma$ in the KM unitarity
triangle assumed that the tree contribution to $B^-\to \pi^-\bar K^0 $ is
purely due to annihilation contributions and is negligibly small. This
assumption has to be tested in order to have a correct interpretation of the
experimental data. In this paper we show that using SU(3) symmetry, the
smallness of the tree contribution can be tested in a dynamic model independent
way. We also derive several relations between CP violating rate differences for
$B\to P P$ decays without assuming the smallness of the annihilation
contributions. These relations provide important tests for the Standard Model
of CP violation.


title:
The Large Mixing of the Pseudoscalars in QCD and Large Flavor Mixing of
  Neutrinos

abstract:
  In analogy to the mixing pattern of the pseudoscalar mesons in QCD we discuss
the mixing of massive neutrinos. Unlike the quarks flavor mixing angles the
leptonic mixing angles are large, nearly maximal. The three massive neutrinos
are nearly degenerate.


title: Chiral symmetry breaking in hot matter

abstract:
  This series of three lectures covers (a) a basic introduction to symmetry
breaking in general and chiral symmetry breaking in QCD, (b) an overview of the
present status of lattice data and the knowlegde that we have at finite
temperature from chiral perturbation theory. (c) Results obtained from the
Nambu--Jona-Lasinio model describing static mesonic properties are discussed as
well as the bulk thermodynamic quantities. Divergences that are observed in the
elastic quark-antiquark scattering cross-section, reminiscent of the phenomenon
of critical opalescence in light scattering, is also discussed. (d) Finally, we
deal with the realm of systems out of equilibrium, and examine the effects of a
medium dependent condensate in a system of interacting quarks.


title: Electroweak effects in the $B^0-{\bar B}^0$ mixing

abstract:
  We compute analytically the complete electroweak two-loop corrections to the
$B^0-{\bar B}^0$ mixing. These corrections fix the normalization of the
electroweak coupling employed in the extraction of $|V_{td}|$ and reduce the
theoretical uncertainty due to higher order electroweak effects from several
percent to a few parts in a thousand. If the LO result is expressed in terms of
$G_\mu$ or of the $\bar{MS}$ coupling $\hat{g}(M_Z)$, the two-loop corrections
are $O(1%)$, the exact value depending on the mass of the Higgs boson. We
discuss in detail the renormalization procedure and the scheme and scale
dependence, and provide practical formulas for the numerical implementation of
our results. We also consider the heavy top mass expansion and show that in the
case at hand it converges very slowly.


title:
Galactic anisotropy of Ultra-High Energy Cosmic Rays produced by
  CDM-related mechanisms

abstract:
  We briefly review current theoretical and experimental status of Ultra-High
Energy Cosmic Rays. We show that ``top-down'' mechanisms of UHE CR which
involve heavy relic particle-like objects predict Galactic anisotropy of
highest energy cosmic rays at the level of minimum $\sim 20%$. This anisotropy
is large enough to be either observed or ruled out in the next generation of
experiments.


title: Form factor relations for pseudoscalar to vector meson transitions

abstract:
  In semi-leptonic and other weak decays of mesons, the hadronic matrix
elements of the operators in the weak Hamiltonian are parametrized by standard
sets of independent, Lorentz invariant, form factors. For the case of
pseudoscalar to vector meson transitions, it has been shown that a Quark Model
description leads to relations between some of the form factors. Here, I give
an alternate, and more general, proof of those relations and thus confirm that,
in the Quark Model, not all the form factors for pseudoscalar to vector meson
transitions are independent. As an application of this result, a Quark Model
measurement of the CKM parameter |Vub| can be obtained, where the dependence on
all hadronic form factors is eliminated.


title: Reply to Comment on "Hara's theorem in the constituent quark model"

abstract:
  In the preceding Comment it is alleged that a "hidden loophole" in the proof
of Hara's theorem has been found, which purportedly invalidates the conclusions
of the paper commented upon. I show that there is no such loophole in the
constituent quark model, and that the "counterexample" presented in the Comment
is not gauge invariant.


title: Glueball Spectrum from an Effective Hamiltonian

abstract:
  Using simple and general arguments we propose an effective Hamiltonian for
the description of low-energy pure QCD. The Hamiltonian is a function of
spatially constant collective modes. Its eigenstates can be organized into
bands classified by the irreducible representations of an O(8) group. The
latter also determine parity and charge conjugation of the states. The energy
spectrum agrees well with the glueball spectrum as measured on the lattice, and
in particular the level ordering with respect to spin is naturally explained.


title: New Polynomial Law of Hadron Mass

abstract:
  A simple and general law of mass, intrinsically with zero freely-adaptable
parameters, is shown to be valid for all the hadrons with one or more flavored
(s, c, or b) quarks/antiquarks, both baryons and mesons. It establishes
correspondences H-->{P_i} between these hadrons with at least one flavored
constituent, H, and specific sets of lighter particles, {P_i}, in which the
total baryon and lepton numbers are conserved. The law is polynomial with a
varying degree that univocally depends only on the particles involved. Its
statement may be given straightforwardly in terms of the binomial series
converging to 1/sqrt{1-beta}. It asserts that, for each hadron H, there exists
a certain set of lighter particles {P_i}, together with a specific reference
hadron h_0 that fixes the mass scale, such that, for a value of the sum of this
power series equal to the mass of H, a definite partial sum of the series
equals the total mass of particles {P_i}. The starting, independent data in the
rule are the masses of the hadrons with exclusively unflavored (u and d)
constituents (among which, our hadrons h_0, such as the proton or pion) and the
masses of leptons. The consequence of the law is a pre-discretization of the
mass spectrum of the hadrons containing at least one flavored constituent, on
account of which the mass of any of them may only assume one of the values
aprioristically determined by the total masses of lighter particles.


title: The Isospin Model prediction for multi-pion tau decays

abstract:
  The predictions of an isospin model are compared with the branching ratios of
the 5 and 6 pion decays of the tau lepton. In both cases, the isospin model
suggests that the tau favours decays in which there is an omega resonance.
Recent measurements of such tau decays confirm this hypothesis. If the decay of
the tau to 7 pions also proceeds through an intermediate omega, then the
isospin model predicts that the branching ratio of the tau to seven charged
pions should be small when compared with other 7 pion decays. New limits on
this mode appear to support this argument.


title:
Penguin Contributions in the Lifetime Difference between $B_s$ and
  $B_d$, and a Possible New Physics

abstract:
  We consider penguin contributions to the lifetime splitting between the $B_s$
and the $B_d$ meson. In the Standard Model the penguin effects are found to be
opposite in sign, but of similar magnitude as the contributions of the
current-current operators, despite of the smallness of the penguin
coefficients. We predict \begin{eqnarray} \frac{\tau(B_s)}{\tau(B_d)} -1 &=&
\lt(-1.2 \pm 10.0 \rt)
  \cdot 10^{-3} \cdot \lt(\frac{f_{B_s}}{190 \mathrm{MeV}} \rt)^2, \no
\end{eqnarray} where the error stems from hadronic uncertainties. Since penguin
coefficients are sensitive to new physics and poorly tested experimentally, we
analyze the possibility to extract them from a future precision measurement of
$\tau \lt(B_s \rt)/\tau\lt(B_d\rt)$. Anticipating progress in the determination
of the hadronic parameters $\epsilon_1$, $\epsilon_2$ and $f_{B_s}/f_{B_d}$ we
find that the coefficient $C_4$ can be extracted with an uncertainty of order
$|\Delta C_4|\simeq 0.1$ from the double ratio
$[\tau(B_s)-\tau(B_d)]/[\tau(B^+)-\tau(B_d)]$, if $|\epsilon_1-\epsilon_2|$ is
not too small.


title:
Current Status of the Resonant Spin-Flavor Precession Solution to the
  Solar Neutrino Problem

abstract:
  We discuss the current status of the resonant spin-flavor precession (RSFP)
solution to the solar neutrino problem. We perform a fit to all the latest
solar neutrino data for various assumed magnetic field profiles in the sun. We
show that the RSFP can account for all the solar neutrino experiments, giving
as good fit as other alternative solutions such as MSW or Just so, and
therefore can be a viable solution to the solar neutrino problem


title:
The Infrared Behavior of One-Loop Gluon Amplitudes at
  Next-to-Next-to-Leading Order

abstract:
  For the case of $n$-jet production at next-to-next-to-leading order in the
QCD coupling, in the infrared divergent corners of phase space where particles
are collinear or soft, one must evaluate $(n+1)$-parton final-state one-loop
amplitudes through $\Ord(\eps^2)$, where $\eps$ is the dimensional
regularization parameter. For the case of gluons, we present to all orders in
$\eps$ the required universal functions which describe the behavior of one-loop
amplitudes in the soft and collinear regions of phase space. An explicit
example is discussed for three-parton production in multi-Regge kinematics that
has applications to the next-to-leading logarithmic corrections to the BFKL
equation.


title:
Soft Masses in Theories with Supersymmetry Breaking by
  TeV-Compactification

abstract:
  We study the sparticle spectroscopy and electroweak breaking of theories
where supersymmetry is broken by compactification (Scherk-Schwarz mechanism) at
a TeV. The evolution of the soft terms above the compactification scale and the
resulting sparticle spectrum are very different from those of the usual MSSM
and gauge mediated theories. This is traced to the softness of the
Scherk-Schwarz mechanism which leads to scalar sparticle masses that are only
logarithmically sensitive to the cutoff starting at two loops. As a result,
squarks and sleptons are naturally an order of magnitude lighter than gauginos.
In addition, the mechanism is very predictive and the sparticle spectrum
depends on just two new parameters. A significant advantage of this mechanism
relative to gauge mediation is that a Higgsino mass $\mu\sim M_susy$ is
automatically generated when supersymmetry is broken. Our analysis applies
equally well to theories where the cutoff is near a TeV or $M_{Pl}$ or some
intermediate scale. We also use these observations to show how we may obtain
compactification radii which are hierarchically larger than the fundamental
cutoff scale.


title:
Large Squark and Slepton Masses for the First-Two Generations in the
  Anomalous U(1) SUSY Breaking Models

abstract:
  Considering that the soft SUSY breaking scalar masses come from a vacuum
expectation value of the D-term for an external gauge multiplet, the
renormalization of the scalar masses is related to the gauge anomaly. Then, if
the external gauge symmetry is anomaly-free and has no kinetic mixing with the
other U(1) gauge symmetries, the scalar masses are non-renormalized at all
orders assuming that the gaugino masses are negligibly small compared with the
scalar masses. Motivated by this, we construct models where the sfermion masses
for the first-two generations are much heavier than the other superparticles in
the minimal SUSY standard model in a framework of the anomalous U(1) mediated
SUSY breaking. In these models we have to introduce extra chiral multiplets
with the masses as large as those for the first-two generation sfermions. We
find that phenomenologically desirable patterns for the soft SUSY breaking
terms can be obtained in the models.


title:
Scales, Couplings Revisited and Low Energy Phenomenology in M-theory on
  $S^1/Z_2$

abstract:
  We revisit the eleven dimension Planck scale, the physical scale of the
eleventh dimension, the physical scale of Calabi-Yau manifold and coupling in
hidden sector in M-theory on $S^1/Z_2$. And we discuss the reasonable bound on
them. Considering F-term of dilaton and moduli SUSY breaking and choosing two
repersentative points which correspond to scalar quasi-massless scenario and
dilaton dominant SUSY breaking scenario respectively, we analyze experimental
constraints to the parameter space. The sparticle spectrum and some
phenomenological predictions are also given.


title: Quark-composites approach to QCD

abstract:
  We present a perturbative approach to QCD based on quark composites, that is
barions and mesons, as fundamental variables.


title:
Analysis of the Lambda_b -> Lambda_c + l nu_l decay within a light-front
  constituent quark model

abstract:
  We present an investigation of the Isgur-Wise form factor relevant for the
semileptonic decay Lambda_b -> \Lambda_c + l nu_l performed within a
light-front constituent quark model. Adopting different baryon wave functions
it is found that the Isgur-Wise form factor depends sensitively on the baryon
structure. It is shown however that the shape of the Isgur-Wise function in the
full recoil range relevant for the Lambda_b -> \Lambda_c + l nu_l decay can be
effectively constrained using recent lattice QCD results at low recoil. Then,
the Lambda_b -> \Lambda_c + l nu_l decay is investigated including both
radiative effects and first-order power corrections in the inverse heavy-quark
mass. Our final predictions for the exclusive semileptonic branching ratio, the
longitudinal and transverse asymmetries, and the longitudinal to transverse
decay ratio are: Br(Lambda_b -> \Lambda_c + l nu_l) = (6.3 +/- 1.6) % |V_bc /
0.040|**2 ~ tau(Lambda_b) / (1.24 ps), a_L = -0.945 +/- 0.014, a_T = -0.62 +/-
0.09 and R_L/T = 1.57 +/- 0.15, respectively. Moreover, both the longitudinal
asymmetry and the (partially integrated) longitudinal to transverse decay ratio
are found to be only marginally affected by the model dependence of the
Isgur-Wise form factor as well as by first-order power corrections; therefore,
their experimental determination might be a very interesting tool for testing
the SM and for investigating possible New Physics.


title: Hadronic Spectroscopy from the Lattice: Glueballs and Hybrid Mesons

abstract:
  Lattice QCD determinations appropriate to hadron spectroscopy are reviewed
with emphasis on the glueball and hybrid meson states in the quenched
approximation. Hybrids are discussed for heavy and for light quarks. The
effects of sea quarks (unquenching) are explored.


title: The single W production case

abstract:
  The so-called CC20 processes have been extensively analyzed in the
literature. They are a sensitive probe of anomalous electromagnetic couplings
of the W boson and represent a background to searches for new physics beyond
the standard model. Moreover, they represent a contribution to the WW total
cross section, used to derive a value for the W boson mass. The issue of gauge
invariance in the CC20 family has been solved by the introduction of the
Fermion-Loop scheme but several subtleties remain, connected with the region of
vanishing scattering angle of the electron and with the limit of massless final
state fermions in a fully extrapolated setup. A satisfactory solution for
computing the total cross section is given in the context of the equivalent
photon or Weizsacker-Williams approximation which factorizes the flux of
quasi-real photons emitted by the electron from the interaction rate between
the positron and the photon assumed to be real. The correct kinematics for the
inclusion of initial state QED radiation is established. QCD corrections to the
process are discussed and numerical results are shown and commented.


title: Space and Family

abstract:
  Geometrical pictures for the family structure of fundamental particles are
developed. They indicate that there might be a relation between the family
repetition structure and the number of space dimensions.


title: Two Photon Physics in pp and AA Collisions

abstract:
  In central collisions at relativistic heavy ion colliders like the
Relativistic Heavy Ion Collider RHIC/Brookhaven and the Large Hadron Collider
LHC (in its heavy ion mode) at CERN/Geneva, one aims at detecting a new form of
hadronic matter - the Quark Gluon Plasma. We discuss here a complementary
aspect of these collisions, the very peripheral ones. Due to coherence, there
are strong electromagnetic fields of short duration in such collisions. They
give rise to photon-photon and photon-nucleus collisions with high flux up to
an invariant mass region hitherto unexplored experimentally. After a general
survey photon-photon luminosities in relativistic heavy ion collisions are
discussed. Special care is taken to include the effects of strong interactions
and nuclear size. Then photon-photon physics at various gamma-gamma-invariant
mass scales is discussed. The region of several GeV, relevant for RHIC is
dominated by QCD phenomena (meson and vector meson pair production). Invariant
masses of up to about 100 GeV can be reached at LHC, and the potential for new
physics is discussed. Photonuclear reactions and other important background
effects, especially diffractive processes are also discussed. Lepton-pair
production, especially electron-positron pair production is copious. Due to the
strong fields there will be new phenomena, especially multiple e+e- pair
production.


title: On Neutrino Masses and Family Replication

abstract:
  The old issue of why there are more than one family of quarks and leptons is
reinvestigated with an eye towards the use of anomaly as a tool for
constraining the number of families. It is found that, by assuming the
existence of right-handed neutrinos (which would imply that neutrinos will have
a mass) and a new chiral SU(2) gauge theory, strong constraints on the number
of families can be obtained. In addition, a model, based on that extra SU(2),
is constructed where it is natural to have one "very heavy" fourth neutrino and
three almost degenerate light neutrinos whose masses are all of the Dirac type.


title: Charged Vacuum Bubble Stability

abstract:
  A type of scenario is considered where electrically charged vacuum bubbles,
formed from degenerate or nearly degenerate vacuua separated by a thin domain
wall, are cosmologically produced due to the breaking of a discrete symmetry,
with the bubble charge arising from fermions residing within the domain wall.
Stability issues associated with wall tension, fermion gas, and Coulombic
effects for such configurations are examined. The stability of a bubble depends
upon parameters such as the symmetry breaking scale and the fermion coupling. A
dominance of either the Fermi gas or the Coulomb contribution may be realized
under certain conditions, depending upon parameter values.


title:
Form factor relations for heavy-to-light meson transitions: tests of the
  Quark Model predictions

abstract:
  In the case of heavy-to-light weak meson transitions, a Quark Model
derivation leads to very general relations between the form factors that
parametrize the hadronic matrix elements. We investigate to what extent these
form factor relations remain a good approximation, beyond the Quark Model.
  In heavy-to-light pseudoscalar-to-vector meson transitions, a simple argument
shows that the V-A structure of the weak interaction leads to a strong
suppression of the helicity h=+1 amplitude - an effect that has been confirmed
experimentally by the CLEO Collaboration, with a full angular analysis of the B
-> K* J/psi decay. We show that the theoretical predictions, in terms of the
hadronic form factors, can accommodate the suppression of the h=+1 amplitude,
only if the Quark Model relations are verified. Moreover, the form factor
relations also allow us to predict the ratio of the two remaining helicity
amplitudes, with h=0 and h=-1; here too, there is excellent agreement with the
CLEO data for the B -> K* J/psi decay. In the future, similar experimental
tests can be carried out, with a few advantages, using the semileptonic decay B
-> rho l- nu_l.
  The Quark Model relations can also be tested against the predictions for the
hadronic form factors, from the more powerful theoretical methods of Lattice
QCD and Light Cone Sum-Rules. The excellent agreement points once again to the
validity of the form factor relations, beyond the Quark Model framework where
they were derived.


title: Hidden Symmetry and Georgi's Vector Limit

abstract:
  We study the generation of vector meson masses in the Hidden Local Symmetry
(HLS) model of low energy QCD. After demoting the HLS to a hidden global
symmetry (HGS), the rho is explicitly shown to be massless for any value of the
HS parameter "a" and the chiral partner of the pion appears as the Goldstone
boson associated with the spontaneous breaking of the HGS, closely resembling
the predictions of Georgi's vector limit.


title: Wilson loop evaluations in the stochastic vacuum model

abstract:
  The stochastic vacuum model description of a heavy meson is discussed in the
context of a gauge invariant approach where Wilson loop expectation values
appear naturally in the O($v^2$) spin-orbit Hamiltonian. These expectation
values have been derived elsewhere, however by a procedure whose legitimacy is
now placed in question. Here they are derived by standard functional methods
with a result that is identical to the previous one. In addition, a full
spin-independent Hamiltonian reduction to O($v^2$) is carried out.


title: Testing QCD with Hypothetical Tau Leptons

abstract:
  We construct new tests of perturbative QCD by considering a hypothetical tau
lepton of arbitrary mass, which decays hadronically through the electromagnetic
current. We can explicitly compute its hadronic width ratio directly as an
integral over the e^+ e^- annihilation cross section ratio, R_{e^+e^-}.
Furthermore, we can design a set of commensurate scale relations and
perturbative QCD tests by varying the weight function away from the form
associated with the V-A decay of the physical tau. This method allows the wide
range of the R_{e^+e^-} data to be used as a probe of perturbative QCD.


title:
Structure functions in the polarized Drell-Yan processes with spin-1/2
  and spin-1 hadrons: I. general formalism

abstract:
  We discuss general formalism for the structure functions which can be
investigated in the polarized Drell-Yan processes with spin-1/2 and spin-1
hadrons. To be specific, the formalism can be applied to the proton-deuteron
Drell-Yan processes. Because of the spin-1 nature, there are new structure
functions which cannot be studied in the proton-proton reactions. Imposing
Hermiticity, parity conservation, and time-reversal invariance, we find that
108 structure functions exist in the Drell-Yan processes. However, the number
reduces to 22 after integrating the cross section over the virtual-photon
transverse momentum Q_T or after taking the limit Q_T->0. There are 11 new
structure functions in addition to the 11 ones in the Drell-Yan processes of
spin-1/2 hadrons. The additional structure functions are associated with the
tensor structure of the spin-1 hadron, and they could be measured by quadrupole
spin asymmetries. For example, the structure functions exist for "intermediate"
polarization although their contributions vanish in the longitudinal and
transverse polarization reactions. We show a number of spin asymmetries for
extracting the polarized structure functions. The proton-deuteron reaction may
be realized in the RHIC-Spin project and other future ones, and it could be a
new direction of next generation high-energy spin physics.


title: Chiral symmetry and the Delta-Nucleon transition form factors

abstract:
  The three complex form factors entering the $\Delta\to N\gamma^\ast$ vertex
are calculated to ${\cal O}(\epsilon^3)$ in the framework of a chiral effective
theory with explicit \Delta(1232) degrees of freedom included. It is shown that
the low q^2 behavior of the form factors is governed by $\pi N$, $\pi\Delta$
loop effects. Predictions are given for the q^2-dependence of the three
transition-multipoles $M1(q^2), E2(q^2), C2(q^2)$. Furthermore, the role of
presently unknown low energy constants that affect the values of the multipole
ratios EMR(q^2) and CMR(q^2) is elucidated.


title:
Extracting |V_{ub}| from the inclusive charmless semileptonic branching
  ratio of b hadrons

abstract:
  We calculate the inclusive charmless semileptonic decay width of the B meson
using a QCD-based approach. This approach is able to account for both dynamic
and kinematic effects of nonperturbative QCD. The charmless semileptonic decay
width is found to be enhanced by long-distance strong interactions by +(7\pm
5)% with respect to the free quark decay width. Using the resulting theoretical
value for the charmless semileptonic decay width, an extraction of $|V_{ub}|$
is made from the measured lifetime and inclusive charmless semileptonic
branching ratio of b hadrons.


title:
Equation of motion of a classical scalar field with back reaction of
  produced particles

abstract:
  In the one-loop approximation we derive the equation of motion for a
classical scalar field \phi_c (t) with the back reaction of particle production
included. Renormalization of mass and couplings of \phi_c is done explicitly.
The equation is non-local in time, but can easily be treated perturbatively or
numerically. For the weak trilinear coupling of the external field to the
produced particles, the new equation gives the same solution as the familiar
one with the \Gamma \phi_c term. For a stronger coupling and other types of
couplings the results are significantly different. The equation can be applied
to the universe heating by the inflaton decay and to spontaneous baryogenesis.


title:
Hadronization and Strangeness Production in a Chirally Symmetric
  Nonequilibrium Model

abstract:
  The expansion and hadronization of a quark meson plasma is studied using an
effective chiral interaction Lagrangian. The particles we consider are light as
well as strange quarks, which can form pions, kaons and eta mesons via
collision processes. The transport equations for the system are solved using a
QMD type algorithm. We find that in chemical equilibrium at high temperatures
the strange quark mass is considerably higher than the strange current quark
mass and becomes even higher if we assume an initial state free of strange
quarks. This leads to a considerably higher production threshold. In contrast
to simpler scenarios, like thermodynamics of free quarks with their bare mass,
we observe that strangeness production in a plasma is hindered and not
favoured. The different particle species created during the evolution become
separated in coordinate as well as in momentum space. We observe, as at CERN
experiments, a larger mean momentum of kaons as compared to pions. Thus the
radial collective velocity may as well originate from a plasma expansion and
not necessarily from a hadronic scenario.


title:
Proton spin content, axial coupling constant and QCD topological
  susceptibility

abstract:
  The part of the proton spin $\Sigma$ carried by $u, d, s$ quarks is
calculated in the framework of the QCD sum rules in the external fields. The
operators up to dimension 9 are accounted. An important contribution comes from
the operator of dimension 3, which in the limit of massless $u, d, s$ quarks is
equal to the derivative of QCD topological susceptibility $\chi^{\prime} (0)$.
The comparison with the experimental data on $\Sigma$ gives $\chi^{\prime}(0)=
(2.3 \pm 0.6) \times 10^{-3} ~ GeV^2$. The limits on $\Sigma$ and
$\chi^{\prime}(0)$ are found from selfconsistency of the sum rule, $\Sigma =
0.33\pm 0.20$, $\chi^{\prime}(0) = (2.4\pm 0.5)\cdot 10^{-3} GeV.$ The values
of $g_A = 1.37 \pm 0.10$ and $g^8_A = 0.65 \pm 0.15$ are also determined.


title:
Bose-Einstein correlations in high-energy multiple particle production
  processes

abstract:
  Correlations among identical bosons, which are familiar from statistical
physics, play an increasingly important role in high energy multiple particle
production processes. They provide information about the region, where the
particles are produced and, if Einstein's condensation can be reached, they can
lead to spectacular new phenomena.


title:
Heavy Quark Production at a $\gamma \gamma$ Collider: the Effect of
  Large Logarithmic Perturbative Corrections

abstract:
  We present quantitative results on the cross section for $\gamma + \gamma
(J_z=0) \to b \bar{b}\to two b$-jets based on the recently achieved all orders
resummation of large soft (Sudakov) and hard (non-Sudakov) double logarithms.
The next-to-leading order QCD perturbative corrections are included exactly. We
find that one needs to include at least four loops for the novel hard leading
logarithms, on the cross section level, in order to be safe from large opposite
sign cancellations that plagued earlier phenomenological studies. We find that
the background to intermediate mass Higgs boson production at a future photon
linear collider (PLC) is thus reasonably well under control and should allow
the direct determination of the partial Higgs width $\Gamma (H \to \gamma +
\gamma)$. Assuming high efficiency $b$-tagging, the total Higgs width
measurement at a PLC is thus a realistic goal.


title: Quark Spin and Orbital Angular Momentum in the Chiral Quark Model

abstract:
  Quark spin and orbital angular momentum in the nucleon are calculated in
symmetry-breaking chiral quark model. The results are compared with data and
other models.


title: Real Time Radiative Corrections to Charged Particle Decay Laws

abstract:
  The real time exponential decay laws for meta-stable charged particles are
shown to require radiative corrections. The methods employed are well known to
be valid for radiatively correcting Breit-Wigner line shapes. Radiative
corrections contribute substantially to precision life time measurements of
muons and pions when initially stopped in condensed matter.


title:
Large mixing, family structure, and dominant block in the neutrino mass
  matrix

abstract:
  A possible connection between the flavour structure of the charged fermions
and the large $\nu_\mu-\nu_\tau$ mixing motivates an ansatz for the neutrino
mass matrix with a dominant block. We distinguish between a general form and
the specific forms of the ansatz, and concentrate on the cases of
phenomenological interest. The general form can incorporate an observable
amount of CP violation in the leptonic sector. Only specific forms can
incorporate the Mikheyev-Smirnov-Wolfenstein solutions for solar neutrinos,
with small or large mixing angles. Other specific variants explain the Los
Alamos neutrino anomaly, or provide a two-neutrino hot dark matter component.


title:
Possible Origin of Fermion Chirality and Gut Structure From Extra
  Dimensions

abstract:
  The fundamental chiral nature of the observed quarks and leptons and the
emergence of the gauge group itself are most puzzling aspects of the standard
model. Starting from general considerations of topological properties of gauge
field configurations in higher space-time dimensions, it is shown that the
existence of non-trivial structures in ten dimensions would determine a class
of models corresponding to a grand unified GUT structure with complex fermion
representations with respect to $ SU(3)_C \otimes SU(2)_L \otimes U(1)_Y$. The
discussion is carried out within the framework of string theories with
characteristic energy scales below the Planck mass. Avoidance of topological
obstructions upon continuous deformation of field configurations leads to
global chiral symmetry breaking of the underlying fundamental theory, imposes
rigorous restrictions on the structure of the vacuum and space-time itself and
determines uniquely the gauge structure and matter content.


title:
Three-loop beta function and non-perturbative $\alpha_s$ in asymmetric
  momentum scheme

abstract:
  We determine the three-loop coefficient of the beta function in the
asymmetric momentum subtraction scheme in Landau gauge. This scheme is
convenient for lattice studies of \alpha_s, the running coupling constant of
QCD. We present high statistics lattice results for \alpha_s in the SU(3)
Yang-Mills theory without quark, compare with the three-loop running and
extract the value of the corresponding \Lambda_\msbar parameter. We estimate
the systematic error coming from four-loop terms. We obtain the result:
\Lambda_\msbar = 295 (5) (15) {a^{-1}(\beta=6.0) \over 1.97 GeV} MeV.


title:
Sudakov suppression in the soft heavy to light meson transition form
  factor

abstract:
  We calculate hard gluon contribution to the decay vertex that determines the
heavy-to-light meson transition form factor at large recoil. It is found that
resulting Sudakov suppression significantly decreases the soft, wave function
dependent contribution to the form factor. Phenomenological implications of
these findings are discussed.


title:
Numerical Study of Hawking Radiation Photosphere Formation around
  Microscopic Black Holes

abstract:
  Heckler has recently argued that the Hawking radiation emitted from
microscopic black holes has sufficiently strong interactions above a certain
critical temperature that it forms a photosphere, analogous to that of the sun.
In this case, the visible radiation is much cooler than the central temperature
at the Schwarzschild radius, in contrast to the naive expectation for the
observable spectrum. We investigate these ideas more quantitatively by solving
the Boltzmann equation using the test particle method. We confirm that at least
two kinds of photospheres may form: a quark-gluon plasma for black holes of
mass M_{BH} < 5 times 10^{14} g and an electron-positron-photon plasma for
M_{BH} < 2 times 10^{12} g. The QCD photosphere extends from the black hole
horizon to a distance of 0.2--4.0 fm for 10^9 g < M_{BH} < 5 10^{14} g, at
which point quarks and gluons with average energy of order \Lambda_{QCD}
hadronize. The QED photosphere starts at a distance of approximately 700 black
hole radii and dissipates at about 400 fm, where the average energy of the
emitted electrons, positrons and photons is inversely proportional to the black
hole temperature, and significantly higher than was found by Heckler. The
consequences of these photospheres for the cosmic diffuse gamma ray and
antiproton backgrounds are discussed: bounds on the black hole contribution to
the density of the universe are slightly weakened.


title:
ISAJET 7.40: A Monte Carlo Event Generator for $pp, \bar pp$, and
  $e^+e^-$ Reactions

abstract:
  ISAJET is a Monte Carlo program which simulates $pp, \bar pp$ and $e^+e^-$
interactions at high energies. This document summarizes the physics underlying
the program and describes how to use it. New features of Version 7.40 include
generation of $W+H$ and $Z+H$ events, non-minimal GMSB models, and use of the
experimental $\alpha_s(M_Z)$ by default.


title:
Isospin-Breaking Vector Meson Decay Constants From Continuous Families
  of Finite Energy Sum Rules

abstract:
  The isospin-breaking vector meson decay constants are determined from a QCD
sum rule analysis of the vector current correlator $<O| T(V^3_\mu V^8_\nu)|
O>$, using a recently proposed implementation of the finite energy sum rule
approach. The analysis employs the three-loop version of the OPE, and two
different families of weight functions. It is shown that the requirement of
consistency between results obtained using these two different weight families
leads to a rather good determination of the parameter describing the deviation
of the D=6 condensate term in the OPE from its vacuum saturation value, and
that the ability to determine this value has non-trivial numerical consequences
to the analysis. The phenomenological relevance of the results to the
extraction of the strange quark mass and the determination of the $6^{th}$
order chiral low energy constant, $Q$, is also briefly discussed.


title: Gaugino Mass without Singlets

abstract:
  In models with dynamical supersymmetry breaking in the hidden sector, the
gaugino masses in the observable sector have been believed to be extremely
suppressed (below 1 keV), unless there is a gauge singlet in the hidden sector
with specific couplings to the observable sector gauge multiplets. We point out
that there is a pure supergravity contribution to gaugino masses at the quantum
level arising from the superconformal anomaly. Our results are valid to all
orders in perturbation theory and are related to the `exact' beta functions for
soft terms. There is also an anomaly contribution to the A terms proportional
to the beta function of the corresponding Yukawa coupling. The gaugino masses
are proportional to the corresponding gauge beta functions, and so do not
satisfy the usual GUT relations.


title:
The signature at the Tevatron for the light doubly charged Higgsino of
  the supersymmetric left-right model

abstract:
  We analyze the signal at the Tevatron for the doubly charged Higgs superfield
of supersymmetric left-right models with gauge mediated supersymmetry breaking.
Due to the presence of a new coupling, the lighter stau is usually less massive
than the lightest neutralino and is frequently the NLSP. The fermionic part of
the doubly charged Higgs field decays dominantly into two tau leptons plus
missing energy (gravitino). We find that the inclusive two tau jets and three
tau jets plus missing energy signatures could be observable at Run II of the
Tevatron. We also find that the distribution in angle between the two highest
E_T tau jets when they come from same sign tau leptons can be used to
distinguish this model from the others.


title: Transversity distributions and spin asymmetries

abstract:
  We discuss transversity distributions and transverse spin asymmetries. First,
$Q^2$ evolution results are shown for transversity and longitudinally polarized
distributions. Second, the antiquark flavor asymmetry $\Delta_{_T} \bar
u/\Delta_{_T} \bar d$ is discussed in two different descriptions, a meson-cloud
model and an exclusion model. Both calculations produce a significant $\Delta_T
\bar d$ excess over $\Delta_{_T} \bar u$. Third, we explain general formalism
of the polarized proton-deuteron Drell-Yan processes. This study is partly
intended to find the asymmetry $\Delta_{_T} \bar u/\Delta_{_T} \bar d$ by the
p-d asymmetry. However, the existence of tensor structure in the deuteron
produces a number of new structure functions. There exist 108 structure
functions and 22 ones even after integrating the cross section over the
virtual-photon transverse momentum $\vec Q_T$.


title: Stochastic Pionisation in Hot Quark-Gluon Matter

abstract:
  We present a microscopic approach to dynamical pionisation of the hot
quark-gluon matter formed in ultrarelativistic heavy ion collisions. The time
evolution of the system is described assuming that quarks undergo Brownian
motion in a thermal bath provided by the gluons. The rate of hadronization as
well as the time dependence of the temperature of the system are seen to be
quite sensitive to the QCD $\Lambda$ parameter. Even in a non-equilibrium
scenario, we find that there appears a clear hint of a first order phase
transition.


title:
Possible scenarios for soft and semi-hard components structure in
  central hadron-hadron collisions in the TeV region

abstract:
  Possible scenarios in hh collisions in the TeV regions are discussed in full
phase space. It is shown that at such high energies one should expect strong
KNO scaling violation and a ln(s) increase of the average charged multiplicity
of the semi-hard component, resulting in a huge mini-jet production.


title: Particle production from axial fields

abstract:
  We study the production of massive fermions in arbitrary vector and
axial-vector classical backgrounds using effective action techniques. A
perturbative calculation shows the different features of each field and in
particular it is seen that pure temporal axial fields can produce particles
whereas it is not possible for a pure vector background. We also analyze from a
non-perturbative point of view a particular configuration with constant
electric and axial fields and show that the presence of the axial background
inhibits the production from the electric field.


title: Radiative four neutrino masses and mixings

abstract:
  The radiative model, proposed by Zee, is extended from the three neutrino
$(\nu_{e,\mu,\tau})$ sector to include a fourth sterile neutrino $\nu_s$. The
oscillations $\nu_e \leftrightarrow \nu_s$ (solar), $\nu_\mu \leftrightarrow
\nu_\tau$ (atmospheric) and $\nu_e \leftrightarrow \nu_\mu$ (LSND) are invoked
to explain all oscillation data with the successful relation $(\Delta
m^2)_{atm} \simeq 2[(\Delta m^2)_{solar} (\Delta m^2)_{LSND}]^{1/2}$ as an
added bonus.


title: Addendum to Finite-size effects on multibody neutrino exchange

abstract:
  The interaction energy of the neutrons due to massless neutrino exchange in a
neutron star has recently been proved, using an effective theory, to be
extremely small and infrared-safe. Our comment here is of conceptual order: two
approaches to compute the total interaction energy density have recently been
proposed. Here, we study the connection between these two approaches. From CP
invariance, we argue that the resulting interaction energy has to be even in
the parameter $b=-G_F n_n /\sqrt{2}$, which expresses the static neutrino
potential created by a neutron medium of density $n_n$.


title: Virtual Photon Structure from Low Q^2 Jet Production

abstract:
  We review next-to-leading order calculations of one- and two-jet production
in ep collisions at HERA for photon virtualities in the range 1<Q^2<100 GeV^2.
Soft and collinear singularities are extracted using the phase space slicing
method. Numerical results are presented for HERA conditions with the Snowmass
jet definition. The transition between photoproduction and deep-inelastic
scattering is studied. We discuss the comparison with recent H1 data of the
dijet rate and differential dijet cross sections with special attention to the
region, in which two jets have equal transverse momenta.


title: Factorization in Color-Suppressed B Meson Decays

abstract:
  We summerize the status of factorization hypothesis in the color-suppressed B
meson decays : $B \to J/\psi K^{(*)}$. We present the general formalism for
decay rates and polarization fractions with considering all possible
non-factorizable contributions which also include the color-octet
contributions, and a new factorization scheme comes appear when the
universality is exist : $\chi_{F1} = \chi_{A1} = \chi_{A2} = \chi_{V} = \chi$.
We consider various phenomenological models to compare their theoretical
predictions with the recent CLEO II experimental measurements.


title: Non-Markovian effects in strong-field pair creation

abstract:
  We analyze a quantum kinetic equation describing both boson and fermion pair
production and explore analytically and numerically the solution of the
non-Markovian kinetic equation. In the Markovian limit of the kinetic equation
we find an analytical solution for the single particle distribution function of
bosons and fermions. The numerical investigation for a homogeneous, constant
electric field shows an enhancement (bosons) or a suppression (fermions) of the
pair creation rate according to the symmetry character of the produced
particles. For strong fields non-Markovian effects are important while they
disappear for weak fields. Hence it is sufficient to apply the low density
limit for weak fields but necessary to take into account memory effects for
strong fields.


title: Weak-scale hidden sector and electroweak Q-balls

abstract:
  By extending the scalar sector of the Standard Model (SM) by a U(1) singlet,
we show that the electroweak symmetry breaking enables the formation of a
stable, electrically neutral, colorless Q-ball which couples to the SM particle
spectrum solely through the Higgs boson. This Q-ball has mainly weak and
gravitational interactions, and behaves as a collection of weakly interacting
massive particles. Therefore, it can be a candidate for the dark matter in the
universe.


title:
The 2nd order corrections to the interaction of two reggeized gluons
  from the bootstrap

abstract:
  The 2nd order corrections are obtained to both forward and nonforward
interaction of reggeized gluons in the octet colour channel using as a basis
the bootstrap relation and a specific ansatz to solve it. The obtained forward
kernel coincides with the logarithmic term plus two first non-logarithmic terms
in the Pomeron 2nd order kernel. Both forward and nonforward kernels are found
to be infrared finite.


title: (Anti-)self-dual homogeneous gluon field and axial anomaly in QCD

abstract:
  The transition form factor, decay width and charge form factor of pion are
calculated within the model of induced nonlocal quark currents based on the
assumption that the nonperturbative QCD vacuum can be characterized by a
homogeneous (anti-)self-dual gluon field. It is shown that the interaction of
the quark spin with the vacuum gluon field, being responsible in the model for
the chiral symmetry breaking and the spectrum of light mesons, can also play
the decisive role in forming the transition form factor and two-photon decay
width. Asymptotic behavior of quark loops in the presence of the background
gluon field for large momentum transfer is discussed.


title: Dark matter: the top of the iceberg?

abstract:
  We argue in favor of the existence of the LIPs, the least interacting
particles, which would only interact with ordinary matter through gravitational
field and could account for (at least) part of the dark matter. The
detectability of LIP matter is addressed at the end.


title:
Electric Dipole Moments Do Not Require the CP-violating Phases of
  Supersymmetry To Be Small

abstract:
  We report the first fully general numerical calculation of the neutron and
electron dipole moments, including the seven significant phases. We find that
there are major regions in the parameter space where none of the phases are
required to be small, contrary to the conventional wisdom. The electric dipole
moments (EDM's) do provide useful constraints, allowing other regions of
parameter space to be carved away. We keep all superpartner masses light so
agreement with experimental limits arises purely from interesting relations
among soft breaking parameters.


title:
Leading Electroweak Corrections to the Neutral Higgs Boson Production at
  the Fermilab Tevatron

abstract:
  We calculate the leading electroweak corrections to the light neutral Higgs
boson production via $q\bar q'\to WH$ at the Fermilab Tevatron in both the
standard model and the minimal supersymmetric model, which arise from the
top-quark and Higgs boson loop diagrams. We found that the leading electroweak
corrections can exceed the QCD corrections for favorable values of the
parameters in the MSSM, but such corrections are only about $-1% \sim -2%$ in
the SM, which are much smaller than the QCD corrections. For the mass region of
$90 < m_{h_0} < 120$ GeV, the leading electroweak corrections can reach -10%
for large $\tan\beta$, and these corrections may be observable at a high
luminosity Tevatron; at the least, new constraints on the $\tan\beta$ can be
established.


title: On the formation of non-topological string networks

abstract:
  We review recent simulations of the formation of a particular class of
non-topological defects known as semilocal strings during a phase transition.
Semilocal strings have properties that are intermediate between topological
cosmic strings and stable electroweak strings, and therefore the observation
that they could form in substantial quantities during a cosmological phase
transition has implications for structure formation, baryogenesis, etc. At the
same time, and from a purely theoretical point of view, they provide a very
good testing ground for investigating the role of gauge fields in defect
formation.


title:
QCD analysis of $xF_3$ structure function data and power correction to
  $\alpha_s$

abstract:
  Power corrections both to the strong coupling constant and to the structure
function itself are estimated on the basis of the LO, NLO and NNLO QCD analysis
of $xF_3$ structure function data. The sign of correction to the coupling
constant is found to be negative. The x-shape of a higher twist contribution to
the structure function is stable up to NNLO.


title: The motion equation for massive fermions and bosons without Higgs

abstract:
  The motion equation with nonzero mass, invariant for weak isospin
transformation, can be obtained from the Dirac equation by the adding of the
Clifford pentad fifth element. The motion equation of the SU(2) Yang-Mills
field components is similar to the Klein-Gordon equation with the nonzero mass.


title:
Angular Distribution of Decay Leptons from e^+e^- \to W^+W^- at
  Threshold

abstract:
  The reaction $ e^+e^- \to W^+W^-$ produces a $W$-boson pair with a
non-trivial spin correlation at threshold. This correlation leads to a
characteristic angular correlation between the leptons produced in $W^{\pm} \to
\ell ^{\pm} \nu$ (angles relative to the $e^-$ beam direction): $d \sigma /d
\cos \theta_+ d \cos \theta_- \sim (1-\cos \theta_+) (1+ \cos \theta_-) (1+\cos
\theta_- \cos \theta_+) $ . If only the $\ell^-$ is observed, its angular
distribution is $d \sigma / d \cos \theta_- \sim (1+\cos \theta_-)(3-\cos
\theta_-) $, implying a forward-backward asymmetry of 3/8. An analytic result
is also given for the azimuthal correlation. These results are reproduced by a
Monte Carlo program, that also enables us to study the effects of the $W$ decay
width. The threshold behaviour, which stems from the dominance of
$\nu$-exchange, is contrasted with that due to $\gamma$- and $Z$-exchange,
which is relevant for annihilation in the helicity state $e^-_Re^+_L$.