title: Anomalous Magnetic and Electric Dipole Moments of the Tau

abstract:
  This paper reviews the theoretical predictions for and the experimental
measurements of the anomalous magnetic and electric dipole moments of the tau
lepton. In particular, recent analyses of the $\eettg$ process from the L3 and
OPAL collaborations are described. The most precise results, from L3, for the
anomalous magnetic and electric dipole moments respectively are: $\atau = 0.004
\pm 0.027 \pm 0.023$ and $\dtau = (0.0 \pm 1.5 \pm 1.3)\times
10^{-16}{e{\cdot}\mathrm{cm}}$.


title:
Low and High Q^2 Jet Production in \gamma^*\gamma$-Scattering at e+e-
  Colliders

abstract:
  I review recent results on NLO calculations in QCD for inclusive jet
production in \gamma^*\gamma-scattering at e+e- colliders. I discuss the region
of large Q^2 (DIS regime) and the transition to small Q^2 (virtual
photoproduction regime). The limit to real photoproduction is performed and
compared with existing calculations.


title: The Odderon in Theory and Experiment - A mini-Review

abstract:
  We review recent theoretical and phenomenological results on both the
perturbative and non-perturbative Odderon. The HERA type of experiments
constitutes a direct probe of the Odderon.


title: Symmetries and structure of skewed and double distributions

abstract:
  Extending the concept of parton densities onto nonforward matrix elements
<p'|O(0,z)|p> of quark and gluon light-cone operators, one can use two types of
nonperturbative functions: double distributions (DDs) f(x,\alpha;t), F(x,y;t)
and skewed (off&nonforward) parton distributions (SPDs) H(x,\xi;t),
F_\zeta(X,t). We treat DDs as primary objects producing SPDs after integration.
We emphasize the role of DDs in understanding interplay between X (x) and \zeta
(\xi) dependences of SPDs.In particular, the use of DDs is crucial to secure
the polynomiality condition: Nth moments of SPDs are Nth degree polynomials in
the relevant skewedness parameter \zeta or \xi. We propose simple ansaetze for
DDs having correct spectral and symmetry properties and derive model
expressions for SPDs satisfying all known constraints. Finally, we argue that
for small skewedness, one can obtain SPDs from the usual parton densities by
averaging the latter with an appropriate weight over the region [X-\zeta,X] (or
[x - \xi, x + \xi]).


title: Getting the Most From Atmospheric Neutrinos

abstract:
  Observations of atmospheric neutrinos by the SuperKamiokande collaboration
have demonstrated large mixing of the muon-neutrino. However the present
atmospheric neutrino data does not significantly constrain the associated
mixing of the electron-neutrino, or the sign of the mass-squared difference.
Here we identify the diagnostics for these quantities and they also test the
theory of how matter affects neutrino oscillations. These diagnostics are a dip
in the sub-GeV muon flux at a zenith angle of 110 degrees, a bump in the
electron up-down asymmetry at multi-GeV energies and a bump in the
muon-antimuon upward asymmetry.


title: Tau Appearance In Atmospheric Neutrino Interactions

abstract:
  If the correct interpretation of the Super-Kamiokande atmospheric neutrino
data is \nu_\mu -> \nu_\tau oscillation, the contained data sample should
already have more than 10 tau appearance events. We study the challenging task
of detecting the tau, focussing on the decay chain \tau^\pm -> \rho^\pm ->
\pi^\pm \pi^0 in events with quasi-elastic tau production. The background
level, which is currently quite uncertain because of a lack of relevant neutral
current data, can be measured by the near detector in the K2K experiment. Our
estimates of the background suggest that it may be possible to detect tau
appearance in Super-Kamiokande with 5-10 years of running.


title:
The baryon magnetic moments of the octet and the decuplet using
  different limits of the SU(3) flavor group

abstract:
  Working within the non relativistic quark model a two parameter fit to the
magnetic moments of baryons is presented. The fit has an excellent $\chi^2$.
The model is based on taking different flavor groups to describe the different
magnetic moments. The selection of which group to assign to each baryon is
guided by the structure of its wavefunction. The model corresponds to assigning
different effective masses to a quark depending on which baryon is being
considered. Using the values extracted from the fit, the magnetic moments of
the $\Omega^-$ and the $\Delta^{++}$ have been predicted and the comparison to
the existing experimental values is quite satisfactory.


title: Decays of excited strange mesons in the extended NJL model

abstract:
  A chiral U(3)xU(3) Lagrangian, containing besides the usual meson fields
their first radial excitations, is considered. The Lagrangian is derived by
bosonization of the Nambu--Jona-Lasinio quark model with separable non-local
interactions. The spontaneous breaking of chiral symmetry is governed by the
NJL gap equation. The first radial excitations of the kaon, K^* and \phi are
described with the help of two form factors. The values for the decay widths of
the processes K^*' --> \rho K, K^*' --> K^* \pi, K^*'--> K \pi, \phi' --> K^*
K, \phi' --> KK, K' --> K \rho, K' --> K^* \pi and K' --> K 2\pi are obtained
in qualitative agreement with the experimental data.


title:
The renormalization group analysis of the large lepton flavor mixing and
  the neutrino mass

abstract:
  The Superkamiokande experiment suggests the large flavor mixing between nu_mu
and nu_tau. We show that the mixing angle receives significant corrections from
the renormalization group equation (RGE) when both the second and the third
generation neutrino masses are larger than O(0.1eV). This means that the mixing
angle must be small at the decoupling scale of right-handed neutrinos in the
model containing a sterile neutrino nu_s with the mass spectrum of m_nu_s =
m_nu_e << m_nu_mu = m_nu_tau.


title: Relativistic quark model and meson Regge trajectories

abstract:
  The D-and F-wave quark-quark amplitudes are constructed in the framework of
the dispersion N/D-method. The mass values of meson multiplets with
$J^{PC}=1^{--},2^{--},2^{-+},3^{--}$ and $J^{PC}=2^{++},3^{++},3^{+-},4^{++}$
are calculated. The Regge trajectories of mesonic resonances with orbital
numbers L=0,1,2,3 are obtained.


title: Yukawa Coupling Contribution to Magnetic Field Induced Dynamical Mass

abstract:
  By solving the gap equation in the quenched, ladder approximation for an
Abelian gauge model with Yukawa interaction in the presence of a constant
magnetic field, we show that the Yukawa interactions enhance the dynamical
generation of fermion mass. The theory is then studied at finite temperature,
where we prove that the critical magnetic field, required for the mass
generation to be important at temperatures comparable to the electroweak
critical temperature, can be substantially decreased due to the Yukawa
coupling.


title:
Numerical Solution of the Evolution Equation for Orbital Angular
  Momentum of Partons in the Nucleon

abstract:
  The evolution of orbital angular momentum distributions within the radiative
parton model is studied. We use different scenarios for the helicity weighted
parton distributions and consider a broad range of input distributions for
orbital angular momentum. In all cases we are lead to the conclusion that the
absolute value of the average angular momentum per parton peaks at relatively
large $x\approx 0.1$ for perturbatively accessible scales. Furthermore, in all
scenarios considered here the average orbital angular momentum per parton is
several times larger for gluons than for quarks which favours gluon initiated
reactions to measure orbital angular momentum. The large gluon polarization
typically obtained in NLO-fits to DIS data is primarily canceled by the gluon
orbital angular momentum.


title:
Higher Twist Distribution Amplitudes of Vector Mesons in QCD: Twist-4
  Distributions and Meson Mass Corrections

abstract:
  We present a systematic study of twist-4 light-cone distribution amplitudes
of vector mesons in QCD, which is based on conformal expansion. The structure
of meson mass corrections is studied in detail. A complete set of distribution
amplitudes is constructed, which satisfies all (exact) equations of motion and
constraints from conformal expansion. Nonperturbative input parameters are
estimated from QCD sum rules. Our study suggests that meson mass corrections
may present a dominant source of higher twist effects in exclusive processes.


title: Multiparticle Dynamics 1998: Summary talk

abstract:
  Contents:
  1. Pomeron physics
  2. Multiplicities
  3. Single-particle distributions
  4. Correlations and fluctuations
  5. Special final states and interaction mechanisms
  6. Cosmic rays and forward detectors


title: Gluon Density Inside the Proton From Current-Target Correlations ?

abstract:
  The possibility to determine the gluon density inside the proton in deep
inelastic ep collisions using current-target multiplicity correlations is
discussed.


title: Universal Isgur-Wise form factors from QCD sum rules in HQET

abstract:
  We review the role of the universal Isgur-Wise functions parameterizing the
$B$ meson semileptonic matrix elements to charm states in the infinite heavy
quark mass limit. We also discuss the determination of one of such form factors
by QCD sum rules in the framework of the Heavy Quark Effective Theory.


title:
Solar and Atmospheric Neutrino Oscillations and Lepton Flavor Violation
  in Supersymmetric Models with Right-handed Neutrinos

abstract:
  Taking the solar and the atmospheric neutrino experiments into account we
discuss the lepton flavor violating processes, such as $\tau\to\mu\gamma$ or
$\mu\to e\gamma$, in the minimal supersymmetric standard model with
right-handed neutrinos (MSSMRN) and the supersymmetric SU(5) GUT with
right-handed neutrinos (SU(5)RN). The predicted branching ratio of $\mu\to
e\gamma$ in the MSSMRN with the MSW large angle solution is so large that it
goes beyond the current experimental bound if the second-generation
right-handed Majorana mass $M_{\nu_2}$ is greater than $\sim 10^{13}(\sim
10^{14})$GeV for $\tan\beta=30(3)$. When we take the MSW small angle solution,
the $\mu\to e\gamma$ rate is at most about 1/100 of that of the MSW large angle
solution. The 'just so' solution implies $10^{-5}$ of that of the MSW large
angle solution. Also, in the SU(5)RN the large $\mu\to e\gamma$ rate naturally
follows from the MSW large angle solution, and the predicted rate is beyond the
current experimental bound if the typical right-handed Majorana mass $M_N$ is
larger than $\sim 10^{13}(\sim 10^{14})$GeV for $\tan\beta=30(3)$, similarly to
the MSSMRN. We show the multimass insertion formulas and their applications to
$\tau\to\mu\gamma$ and $\mu\to e\gamma$.


title:
The Generalized Gerasimov-Drell-Hearn Integral and the Spin Structure of
  the Nucleon

abstract:
  The spin structure functions g1 and g2 have been calculated in the resonance
region and for small and intermediate momentum transfer. The calculation is
based on a gauge-invariant and unitary model for one-pion photo- and
electroproduction. The predictions of the model agree with the asymmetries and
the spin sturcture functions recently measured at SLAC, and the first moments
of the calculated spin structure functions fullfil the Gerasimov-Drell-Hearn
and Burkhardt-Cottingham sum rules within an error of typically 5-10 %.


title:
Parton Content of Polarized Photons: Theoretical Status and Experimental
  Prospects

abstract:
  The theoretical framework for a next-to-leading order QCD analysis of the
spin-dependent parton densities Delta f^{gamma}(x,Q^2) of the longitudinally
polarized photon and of its structure function g_1^{gamma}(x,Q^2) is reviewed
in some detail. Special emphasis is given to the specific features of different
factorization schemes. Two conceivable scenarios for the polarized parton
densities Delta f^{gamma}(x,Q^2) are introduced, which are suitable to study
the sensitivity of future experiments to the so far unmeasured Delta f^{gamma}.
The experimental prospects of determining Delta f^{gamma} at a polarized
collider mode of HERA or at a linear e^+e^- collider are outlined. Finally, the
Q^2-evolution of the parton content of linearly polarized photons, which shows
some remarkable differences, is briefly discussed.


title: Model-independent electroweak penguins in B decays to two pseudoscalars

abstract:
  We study the effects of electroweak penguin (EWP) amplitudes in $B$ meson
decays into two charmless pseudoscalars in the approximation of retaining only
the dominant EWP operators $Q_9$ and $Q_{10}$. Using flavor SU(3) symmetry, we
derive a set of model-independent relations between EWP contributions and
tree-level decay amplitudes one of which was noted recently by Neubert and
Rosner. Two new applications of these relations are demonstrated in which
uncertainties due to EWP corrections are eliminated in order to determine a
weak phase. Whereas the weak angle $\alpha$ can be obtained from $B\to\pi\pi$
free of hadronic uncertainties, a determination of $\gamma$ from $B^{0,\pm}\to
K\pi^{\pm}$ requires the knowledge of a ratio of certain tree-level hadronic
matrix elements. The smallness of this ratio implies a useful constraint on
$\gamma$ if rescattering can be neglected.


title: Spin-dependent forces between quarks in hadrons

abstract:
  Different mechanisms have been proposed to account for the spin-dependent
interaction between quarks in ground-state hadrons. The first mechanism is the
chromomagnetic interaction arising from one-gluon exchange, a second mechanism
is an interaction arising from meson exchange, and a third from instanton
effects. Some lattice calculations favor the first mechanism for heavy quarks
and the third for light quarks. An argument is presented in favor of the
one-gluon exchange mechanism. However, thus far, nobody has performed a crucial
experiment that can definitively distinguish between these mechanisms.


title: Lepton flavor changing in neutrinoless $\tau$ decays

abstract:
  Neutrino oscillations, as recently reported by the Super-Kamiokande
collaboration, imply that lepton numbers could be violated, and $\tau^{\pm}\to
\mu^{\pm}+\ell^{+}+\ell^{-},\tau^{\pm}\to\mu^{\pm}+\rho^0$ are some typical
examples. We point out that in these neutrinoless modes, the GIM cancelation is
much milder with only a logarithmic behavior $\log (m_j /m_k)$ where $m_{j, k}$
are the neutrino masses. This is in sharp contrast with the vanishingly small
amplitude $\tau^{\pm}\to \mu^{\pm}+\gamma$ strongly suppressed by the quadratic
power $(m_j^2-m_k^2)/ M_{\rm W}^2$. In comparison with the hopelessly small
branching ratio B$(\tau^{\pm}\to \mu^{\pm}+\gamma)\approx 10^{-40}$, the
B$(\tau^{\pm}\to\mu^{\pm}+\ell^{+}+\ell^{-})$ could be larger than $10^{-14}$.
The latter mode, if measurable, could give one more constraint to the lepton
mixing angle $\sin 2\theta_{jk}$ and the neutrino mass ratio $m_j/m_k$, and
therefore is complementary to neutrino oscillation experiments.


title: Theoretical Expectations in Radiative Top Decays

abstract:
  We summarize the Standard Model predictions for the three-body decays of the
top quark t->WbX, where X = Z,H,g or gamma. Because of strong phase space
suppression, we find that the branching ratios for the Z and H final states are
of order a few times 10^{-7}, rendering them invisible at Tevatron Run II. On
the other hand, the decays to g and gamma are suppressed only by the expected
factor of alpha_s or alpha_{em}.


title:
J/psi suppression in heavy ion collisions - interplay of hard and soft
  QCD processes

abstract:
  We study J/psi suppression in AB collisions assuming that the charmonium
states evolve from small, color transparent configurations. Their interaction
with nucleons and nonequilibrated, secondary hadrons is simulated using the
microscopic model UrQMD. The Drell-Yan lepton pair yield and the
J/psi/Drell-Yan ratio are calculated as a function of the neutral transverse
energy in Pb+Pb collisions at 160 GeV and found to be in reasonable agreement
with existing data.


title: Leptoproduction of J/\psi

abstract:
  I review the status of the extraction of NRQCD color-octet $J/\psi$
production matrix elements. Large theoretical uncertainties in current
extractions from hadroproduction and photoproduction are emphasized.
Leptoproduction of $J/\psi$ is calculated within the NRQCD factorization
formalism. Color-octet contributions dominate the cross section, allowing for a
reliable extraction of $<{\cal O}_8^{J/\psi}(^1S_0)>$ and $<{\cal
O}_8^{J/\psi}(^3P_0)>$. A comparison with preliminary data from the H1
collaboration shows that leading order color-octet mechanisms agree with the
measured total cross section for $Q^2 > 4m_c^2$, while the color-singlet model
underpredicts the cross section by a factor of 5.


title:
The leading chiral electromagnetic correction to the nonleptonic Delta I
  = 3/2 amplitude in kaon decays

abstract:
  In kaon decay, electromagnetic radiative corrections can generate shifts in
the apparent Delta I = 3/2 amplitude of order alpha A_0/A_2 ~ 22 alpha. In
order to know the true Delta I = 3/2 amplitude for comparison with lattice
calculations and phenomenology, one needs to subtract off this electromagnetic
effect. We provide a careful estimate of the electromagnetic shift in the
amplitude, which shows that it is smaller than naive expectations, with a
fractional shift of delta A_2/A_2 = -0.016 +- 0.01.


title: Strong radiative corrections to W b bbar production in p pbar collisions

abstract:
  We calculate the strong radiative corrections to the process p pbar -> W(->e
nu) g^*(->b bbar). At the Tevatron this process is the largest background to
the associated Higgs boson production p pbar -> W(-> e nu) H(-> b bbar). The
calculation is based on the subtraction procedure, and the corrections are
found to be significant.


title:
Remark on CP-violating Polarization Asymmetry of tt-bar via Anomalous
  Couplings to gamma and Z

abstract:
  We calculate the CP-violating polarization asymmetry of tt-bar, delta =[
sigma(ee-bar --> t(-)t-bar(-))-sigma(ee-bar --> t(+)t-bar(+)) ]/ sigma(ee-bar
--> tt-bar), for the most general tt-bar gamma/Z couplings without dropping any
non-standard contribution. We find that one term which is usually neglected
increases with s and will eventually become non-negligible at very high energy.


title: SO(3) Gauge Symmetry and Neutrino-Lepton Flavor Physics

abstract:
  Based on the SO(3) gauge symmetry for three family leptons and general
see-saw mechanism, we present a simple scheme that allows three nearly
degenerate Majorana neutrino masses needed for hot dark matter. The vacuum
structure of the spontaneous SO(3) symmetry breaking can automatically lead to
a maximal CP-violating phase. Thus the current neutrino data on both the
atmospheric neutrino anomaly and solar neutrino deficit can be accounted for
via maximal mixings without conflict with the current data on the neutrinoless
double beta decay. The model also allows rich interesting phenomena on lepton
flavor violations.


title: Bose - Einstein effect in Monte Carlo generators

abstract:
  We briefly review various methods of implementing the Bose - Einstein effect
into Monte Carlo generators. The weight methods are discussed in more detail;
in particular, our method employing a clustering algorithm is applies for the
process e^+e^- -> W^+W^-. New results for the multiplicity distributions are
presented.


title:
Distinction of atmospheric neutrino-mu - neutrino-tau and neutrino-mu -
  neutrino-sterile oscillations using short or intermediate baseline
  experiments

abstract:
  The current case for atmospheric $\nu_\mu$ oscillations into active or
sterile neutrinos is reviewed. It is argued that neither the study of neutral
current events at Super-Kamiokande, nor the information obtained from future
long baseline experiments might be sufficient to unambigously decide between
these two scenarios. However, a combination of these results with the results
from future short or intermediate baseline $\tau$ appearance experiments would
clearly resolve most of the remaining ambiguities. This conclusion does not
strongly depend on whether the results from LSND will be confirmed or not. In
the case that LSND would be confirmed, a negative result in such a short or
intermediate baseline experiment would also unambigously exclude the
interpretation of LSND as indirect $\nu_\mu-\nu_\tau-\nu_e$ oscillations.


title: Unity of Forces at the Preon Level with new Gauge Symmetries

abstract:
  In the context of a viable, supersymmetric,preon model,it has been shown by
Babu and Pati that the unity of forces can well occur at the level of preons
near the Planck scale.This preonic approach to unification is explored further
in this note with the inclusion of threshold effects which arise due to
spreading of masses near the scale of suppersymmetry ($M_S=1$ TeV) and the
metacolor scale (${\Lambda}_M=10^11$ GeV).These effects,which were ignored in
the earlier work,are found to have marked consequences on the running and
unification of relevant couplings leading to new possibilities for flavor-color
as well as metacolor gauge symmetries.In particular, allowing for seemingly
reasonable threshold effects,it is found that the metacolor gauge
symmetry,$G_M$ is either $SU(6)_M$ or $SU(4)_M$ (rather than $SU(5)_M$) and the
corresponding flavor-color gauge symmetry is either $SU(2)_LXU(1)_RXSU(4)_C$
(for $G_M=SU(6)_M$) or even just the standard model symmetry
$SU(2)_LXU(1)_YXSU(3)_C$ (for $G_M=SU(6)_M or SU(4)_M$).
  Prospects of other preonic gauge symmetries are also investigated.


title: Beyond the black disk limit: from shadow to antishadow scattering mode

abstract:
  New mode in the hadron scattering is predicted to appear at the energies
beyond $\sqrt{s}\simeq 2$ TeV: the antishadow scattering mode and the
experiments at LHC and VLHC in hadronic reactions will be able to reveal it.
The appearance of the antishadow scattering mode at these energies is
considered on the basis of unitarity and geometrical notions of hadron
interactions. Connections with the nonperturbative--QCD models are discussed.


title:
Top quark threshold production in $\gamma\gamma$ collision in the
  next-to-leading order

abstract:
  The total cross section of the top quark-antiquark pair production near
threshold in $\gamma\gamma$ collision is computed analytically up to the
next-to-leading order in perturbative and nonrelativistic expansion for general
photon helicity. The approximation includes the first order corrections in the
strong coupling constant and the heavy quark velocity to the nonrelativistic
Coulomb approximation.


title: Theory of the pi+ pi- atom

abstract:
  The relativistic perturbative approach based on the Bethe-Salpeter (BS)
equation is developed for the study of the characteristics of the hadronic pi+
pi- atom. The general expression for the atom lifetime is derived. Lowest-order
corrections to the relativistic Deser-type formula for the atom lifetime are
evaluated within the Chiral Perturbation Theory. The lifetime of the pi+ pi-
atom in the two-loop order of the Chiral Perturbation Theory is predicted to be
tau_1=(3.03\pm 0.10)\times 10^{-15}~s.


title:
Differential dispersion relations and elementary amplitudes in a
  multiple diffraction model

abstract:
  We discuss the evaluation of the real part of the elementary amplitudes in
the context of a multiple diffraction model for $pp$ elastic scattering earlier
developed. The framework is based on the concepts of analyticity and polynomial
boundedness, and the techniques of dispersion relations. Novel results concern
the use of derivative dispersion relations at the elementary level
(constituent-constituent interactions) and an optimization of these relations
in terms of one free parameter. In addition to a theoretical improvement, we
achieved a satisfactory description of the physical quantities.


title:
Bubble Wall Profiles With More Than One Scalar Field: A Numerical
  Approach

abstract:
  We present a general numerical approach to solve the equations for bubble
wall profiles in models with more than one scalar field and CP violating
phases. We discuss the algorithm as well as several problems associated with it
and show some profiles for demonstration found with our method.


title:
Solving the Supersymmetric Flavor Problem with Radiatively Generated
  Mass Hierarchies

abstract:
  The supersymmetric flavor problem may be solved if the first and second
generation scalars are heavy (with multi-TeV masses) and scalars with large
Higgs couplings are light (with sub-TeV masses). We show that such an inverted
spectrum may be generated radiatively; that is, from initial conditions where
all scalar masses are multi-TeV at some high scale, those with large Higgs
couplings may be driven asymptotically to the weak scale in the infra-red. The
lightness of third generation scalars is therefore a direct consequence of the
heaviness of third generation fermions, and fine-tuning is avoided even though
the fundamental scale of the soft supersymmetry breaking parameters is
multi-TeV. We investigate this possibility in the framework of the usual Yukawa
quasi-fixed point solutions. The required high scale boundary conditions are
found to be simple and highly predictive. This scenario also alleviates the
supersymmetric CP and Polonyi problems.


title:
On the Oscillation Length Resonance in the Transitions of Solar and
  Atmospheric Neutrinos Crossing the Earth Core

abstract:
  Assuming two-neutrino mixing takes place in vacuum, we study in detail the
conditions under which the $\nu_2 \to \nu_{e}$ and $\nu_{\mu} \to \nu_{e}$
($\nu_e \to \nu_{\mu(\tau)}$) transitions in the Earth are strongly enhanced by
the neutrino oscillation length resonance when the neutrinos cross the Earth
core. We show, in particular, that the neutrino oscillation length resonance is
operative also in the $\bar{\nu}_{\mu} \to \bar{\nu}_{s}$ transitions at small
mixing angles. The properties of the $\nu_2 \to \nu_{e}$ and $\nu_{\mu} \to
\nu_{e}$ ($\nu_e \to \nu_{\mu(\tau)}$) transition probabilities in the
corresponding resonance regions are examined. Some implications of our results
for the transitions of solar and atmospheric neutrinos traversing the Earth
core, relevant for the interpretation of the results of the solar and
atmospheric neutrino experiments, are also discussed.


title: Approximate Flavor Symmetry in Supersymmetric Model

abstract:
  We investigate the maximal approximate flavor symmetry in the framework of
generic minimal supersymmetric standard model. We consider the low energy
effective theory of the flavor physics with all the possible operators
included. Spontaneous flavor symmetry breaking leads to the approximate flavor
symmetry in Yukawa sector and the supersymmetry breaking sector. Fermion mass
and mixing hierachies are the results of the hierachy of the flavor symmetry
breaking. It is found that in this theory it is possible to solve the flavor
changing problems. Furthermore baryogenesis of the universe can be well
described and neutron electric dipole moment is closely below it experimental
bound by assuming approximate CP violating phase $\sim 10^{-2}$ and
superpartner mass around 100 GeV.


title: Large Cosmological Light Element Bound on R Parity Violating Parameters

abstract:
  In R parity violating theories, there does not exist the {\it stable}
lightest supersymmetric particle (LSP). The LSP, $\chi$, of MSSM decays to
lighter ordinary particles with dimension 6 effective R violating interaction
terms. Since the lifetime of $\chi$ can be sufficiently long for small
R-violating couplings, it can affect the standard nucleosynthesis scenario.
This constraint gives an upper limit for the lifetime of $\chi$ in the small
$\tau_\chi$ region; $\sim\tau_\chi>10^6$ s. This translates to the sum of
squared R-violating couplings, for $m_\chi=$ 60 GeV in the photino (bino)
limit, $(0.12 (0.05)|\lambda_{i,j,k}|^2+0.31(0.07) |\lambda^\prime_{i,j\ne
3,k}|^2 +0.04(0.04)|\lambda^{\prime}_{i,3,k}|^2
+0.23(0.12)|\lambda_{i,j,k}^{\prime\prime}(i<j,k\ne 3)|^2)> 7.7\times
10^{-24}$.


title:
Spin and spin-spin correlations in chargino pair production at future
  linear e+e- colliders

abstract:
  A possibility to measure the spin and spin-spin correlations of a chargino
pair is investigated in the process electron positron -> chargino_1
anti-chargino_1 -> (neutralino_1 quark anti-quark) (neutralino_1 quark
anti-quark) at future linear-collider energies. The total and the differential
cross sections are calculated by the GRACE system which allows for the full
spin correlation. Experimental sensitivity of the measurements are examined by
assuming the limited detector resolution, the initial state radiation and the
beam-beam effect (beamstrahlung). It is found that generally the spin-spin
correlation can only be measured with a lower sensitivity than the chargino
spin itself. The dependence of the correlation measurements on the relevant
SUSY parameters can be seen for a light sneutrino case, but the situation
becomes worse for a heavier sneutrino.


title: CP Violation in Vacuum Neutrino Oscillation Experiments

abstract:
  We discuss the use of the CP asymmetry parameter (Acp) as a possible
observable of CP violation in the leptonic sector. In order to do this, we
study for a wide range of values of L/E the behavior of this asymmetry for the
corresponding maximal value of the CP violation factor allowed by all present
experimental limits on neutrino oscillations in vacuum and the recent
Super-Kamiokande atmospheric neutrino result. We work in the three neutrino
flavor framework.


title: Discovery Limits for Techni-Omega Production in $e\gamma$ Collisions

abstract:
  In a strongly-interacting electroweak sector with an isosinglet vector state,
such as the techni-omega, $\omega_T$, the direct $\omega_T Z \gamma $ coupling
implies that an $\omega_T$ can be produced by $Z \gamma$ fusion in $e\gamma$
collisions. This is a unique feature for high energy $e^+e^-$ or $e^-e^-$
colliders operating in an $e\gamma$ mode. We consider the processes $e^- \gamma
\to e^- Z\gamma$ and $e^- \gamma \to e^- W^+ W^-Z$, both of which proceed via
an intermediate $\omega_T$. We find that at a 1.5 TeV $e^+e^-$ linear collider
operating in an $e\gamma$ mode with an integrated luminosity of 200 fb$^{-1}$,
an $\omega_T$ can be discovered for a broad range of masses and widths.


title: Photon Fragmentation at LEP

abstract:
  The production of final state photons in hadronic $Z$-boson decays can be
used to study the quark-to-photon fragmentation function $D_{q\to
\gamma}(z,\mu_{F})$. Currently, two different observables are used at LEP to
probe this function: the `photon' +~1 jet rate and the inclusive photon energy
distribution. We outline the results of a calculation of the `photon' +~1 jet
rate at fixed ${\cal O}(\alpha \alpha_{s})$, which yield a next-to-leading
order determination of the quark-to-photon fragmentation function $D_{q\to
\gamma}(z,\mu_{F})$. The resulting predictions for the isolated photon rate and
the inclusive photon spectrum at the same, fixed order, are found to be in good
agreement with experimental data. Furthermore, we outline the main features of
conventional approaches using parameterizations of the resummed solutions of
the evolution equation and point out deficiencies of these currently available
parameterizations in the large $z$-region. We finally demonstrate that the
ALEPH data on the `photon' +~1 jet rate are able to discriminate between
different parameterizations of the quark-to-photon fragmentation function,
which are equally allowed by the OPAL photon energy distribution data.


title: A conjecture on centauro species

abstract:
  It is argued that Centauro events observed in cosmic ray experiments may be
characteristic of only pp and not p(bar)p interactions.


title:
High Density Quark Matter and the Renormalization Group in QCD with two
  and three flavors

abstract:
  We consider the most general four fermion operators in QCD for two and three
massless flavors and study their renormalization in the vicinity of the Fermi
surface. We show that, asymptotically, the largest coupling corresponds to
scalar diquark condensation. Asymptotically the direct and iterated (molecular)
instanton interactions become equal. We provide simple arguments for the form
of the operators that diagonalize the evolution equations. Some solutions of
the flow equations exhibit instabilities arising out of purely repulsive
interactions.


title: Solar Neutrinos and the Violation of Equivalence Principle

abstract:
  In this Brief Report, a non-standard solution to the solar neutrino problem
is revisited. This solution assumes that neutrino flavors could have different
couplings to gravity, hence, the equivalence principle is violated in this
mechanism. The gravity induced mixing has the potential of accounting for the
current solar neutrino data from several experiments even for massless
neutrinos. We fit this solution to the total rate of neutrino events in the
SuperKamiokande detector together with the total rate from other detectors and
also with the most recent results of the SuperKamiokande results for the
recoil-electron spectrum.


title:
Spin-Momentum Correlations in Inclusive Semileptonic Decays of Polarized
  $\Lambda_b$ Baryons

abstract:
  We consider spin-momentum correlations between the spin of the bottom baryon
$\Lambda_{\mathrm{b}}$ and the momenta of its decay products in its inclusive
semileptonic decay. We define several polar and azimuthal spin-momentum
correlation measures in different event coordinate systems. The values of the
spin-momentum correlation measures are calculated up to ${\cal O}(1/m_b^2)$
using the standard OPE und HQET methods. Some of the measures turn out to be
sufficiently large to make them good candidates for a determination of the
polarization of the $\Lambda_{\mathrm{b}}$ in e.g. $\mathrm{Z}$ decays.


title: Lepton anomalous magnetic moments - a theory update

abstract:
  Standard Model contributions to the electron, muon, and tau lepton anomalous
magnetic moments, a_l=(g_l-2)/2, are reviewed and updated. The fine structure
constant is obtained from the electron g_e-2 and used to refine the QED
contribution to the muon g_mu-2. Recent advances in electroweak and hadronic
effects on g_mu-2 are summarized. Examples of ``New Physics'' probed by the
a_mu Brookhaven experiment E821 are outlined. The prediction for a_tau is also
given.


title: Neutrino Mass: Where Do We Stand, and Where Are We Going?

abstract:
  We discuss the three major hints of neutrino mass: the strong evidence of
mass from the behavior of atmospheric neutrinos, the very promising further
hint from the behavior of solar neutrinos, and the so-far unconfirmed hint from
the LSND experiment. Then, we describe two illustrative neutrino-mass scenarios
suggested by the observed hints. We identify the needed future tests of both
the present hints and the neutrino-mass scenarios.


title: Non-Perturbative Couplings and Color Superconductivity

abstract:
  Quark matter at sufficiently high density exhibits color superconductivity,
due to attractive gluonic interactions. At lower densities of order
$\Lambda_{QCD}^3$, it has been proposed that instanton generated vertices may
play an important role in the Cooper pair formation. We study the
renormalization group flow to the Fermi surface of the full set of couplings
generated by gluonic and instanton interactions. In earlier work we showed that
if the gluonic interactions dominate at the matching scale, their running
determines the scale of the Cooper pair formation Delta. Here we consider all
possibilities, including the one in which the instanton interactions dominate
all others at the matching scale. In the latter case we find that a number of
additional induced couplings (including the gluonic ones) reach their Landau
poles almost simultaneously with the instanton vertex. Presumably all
contribute to the Cooper pair formation. The most important consequence of
including all the couplings is a large increase in the gap size Delta.


title: The $\Lambda_b\to pl{\bar\nu}$ decay in perturbative QCD

abstract:
  We develop perturbative QCD factorization theorems for the exclusive
semileptonic heavy baryon decay $\Lambda_b \to pl{\bar\nu}$, in which the
relevant hadronic form factor is expressed as the convolution of a hard
subamplitude with the $\Lambda_b$ baryon wave function and the proton wave
function. The specific evolution scale for the proton wave function, determined
from the best fit to the data of the proton form factor, is adopted. The
Sudakov resummation for a heavy-light system (the $\Lambda_b$ baryon) and the
quark-level decay diagrams with at least one hard gluon attaching the $b$
quark, which were ignored in the literature, are incorporated. It turns out
that these additional ingredients are important: the neglect of the former and
the latter reduces the results of the form factor by factors 1.5 and 3,
respectively. We present the predictions of the form factor and of the proton
energy spectrum for the various choices of the parameter involved in the
$\Lambda_b$ baryon wave function.


title:
Dynamical structure of the chiral QCD vacuum in the zero modes
  enhancement quantum model

abstract:
  Using the effective potential approach for composite operators we have
formulated the quantum model of the QCD vacuum. It is based on the existence
and importance of the nonperturbative $q^{-4}$-type dynamical, topologically
nontrivial excitations of the gluon field configuration. The QCD vacuum is
found stable since the vacuum energy density has no imaginary part. Moreover, a
possible ground (stationary) state of the nonperturbative Yang-Mills (quenched
QCD) vacuum is discovered. The vacuum energy density at stationary state
depends on a scale at which nonperturbative effects become important. The quark
part of the vacuum energy density depends in addition on the constant of
integration of the corresponding Schwinger-Dyson equation. The value of the
above mentioned scale is determined from the bounds for the pion decay constant
in the chiral limit. Our value for the chiral QCD vacuum energy density is one
order of magnitude bigger than the instanton based models can provide while a
fair agreement with recent phenomenological and lattice results for the chiral
condensate is obtained.


title: Quark Flavor Separation in $\Lambda$-Baryon Fragmentation

abstract:
  It is shown that neutrino and antineutrino deep inelastic scattering of
unpolarized and polarized $\Lambda$ and $\bar{\Lambda}$ productions, can
provide a clean separation of unpolarized and polarized fragmentation functions
of a quark into a $\Lambda$, for both light-flavor quarks and antiquarks and
also for strange quarks. Combining with $\Lambda$ and $\bar{\Lambda}$
productions in polarized electron deep inelastic scattering, one can
systematically measure or check the various flavor and spin dependent
fragmentation functions. Such measurements can provide crucial tests of
different predictions concerning the spin structure of hadrons and the
quark-antiquark asymmetry of the nucleon sea.


title: Perspectives for Direct CP Violation Tests in Hyperon Decays

abstract:
  We discuss the perspectives of measuring direct CP violation parameters in
hyperon decays by measurements with proton and/or antiproton beams, to be
carried out at various facilities, and in particular we propose new experiments
at the Tevatron and at the LHC.


title: Thermal bosonisation in the sine-Gordon and massive Thirring models

abstract:
  We study bosonisation in the massive Thirring and sine-Gordon models at
finite temperature T and nonzero fermion chemical potential $\mu$. For that
purpose we use both canonical operator and path integral approaches, paying
particular attention to the issues of thermal normal ordering and
renormalisation. At T>0 and $\mu=0$, the massive Thirring model bosonises to
the sine-Gordon model with the same T=0 identification between coupling
constants. We prove that not only the partition functions of the two models
coincide, as was recently shown, but also that thermal averages of zero-charge
operators can be identified. In particular, analysis of the point-split
regularised fermion current then leads to the thermal equivalence between
sine-Gordon kinks and Thirring fermions. At $\mu \neq 0$, T>0 and working in
perturbation theory about the massless Thirring model, we show that the
bosonised theory is the sine-Gordon model plus an additional topological term
which accounts for the existence of net fermion charge excitations (the
fermions or the kinks) in the thermal bath. This result generalises one
recently obtained for the massless case, and it is the two-dimensional version
of the low-energy QCD chiral Lagrangian at finite baryon density.


title: Flavor Physics and CP Violation

abstract:
  This is a written version of a series of three lectures aimed at graduate
students in the field of experimental high energy physics. The emphasis is on
physics that is relevant to $B$-factories. The main topics covered are: (i) The
flavor sector of the Standard Model; (ii) Determination of the mixing
parameters; (iii) CP violation in meson decays (a model independent
description); (iv) CP violation in the Standard Model; (v) CP violation as a
probe of new physics.


title: Properties of $\rho$-mesons produced in heavy ion collisions

abstract:
  The mass shift and width broadening of $\rho$-mesons produced in heavy ion
collisions is estimated. It is found that the mass increases by some tens of
MeV but the width becomes large, increasing by 200 MeV at beam energies of a
few GeV$\cdot$A and by twice that amount at beam energies of about a hundred
GeV$\cdot$A.


title: Seeking CP Violating Couplings in ZZ Production at LEP2

abstract:
  The effects of CP violating anomalous ZZZ and gammaZZ vertices in ZZ
production are determined. We present the differential cross-section for e+e-
-> ZZ with dependence on the spins of the Z bosons. It is shown that from the
different spin combinations those with one longitudinally and one transversally
polarized Z in the final state are the most sensitive to CP violating anomalous
couplings.


title: Short- and long-distance contributions to the rare decay K_L-->mu+ mu-

abstract:
  The interplay between short- and long-distance contributions to the K_L-->mu+
mu- decay amplitude is analyzed. The long-distance piece is estimated using
chiral perturbation theory techniques and large-N_C considerations, leading to
a consistent description of the pi^0-->e+ e-, eta-->mu+ mu- and K_L-->mu+ mu-
branching ratios.


title:
Early History of Gauge Theories and Kaluza-Klein Theories, with a Glance
  at Recent Developments

abstract:
  One of the major developments of twentieth century physics has been the
gradual recognition that a common feature of the known fundamental interactions
is their gauge structure. In this article the authors review the early history
of gauge theory, from Einstein's theory of gravitation to the appearance of
non-abelian gauge theories in the fifties. The authors also review the early
history of dimensional reduction, which played an important role in the
developement of gauge-theory. A description is given how, in recent times, the
ideas of gauge-theory and dimensional reduction have emerged naturally in the
context of string theory and non-commutative geometry.


title: Discovery limits for Techni-Omega production in $e\gamma$ Collisions

abstract:
  In a strongly-interacting electroweak sector with an isosinglet vector state,
such as the techni-omega, $\omega_T$, the direct $ \omega_T Z \gamma $ coupling
implies that an $\omega_T$ can be produced by $Z \gamma$ fusion in $e \gamma$
collisions. This is a unique feature for high energy $e^+e^-$ or $e^-e^-$
colliders operating in an $e\gamma$ mode. We consider the processes $e^- \gamma
\to e^- Z\gamma$ and $e^- \gamma \to e^- W^+ W^- Z$, both of which proceed via
an intermediate $\omega_T$. We find that at a 1.5 TeV $e^+e^-$ linear collider
operating in an $e\gamma$ mode with an integrated luminosity of 200 fb$^{-1}$,
we can discover an $\omega_T$ for a broad range of masses and widths.


title: Cold and Hot Dark Matter from a Single Nonthermal Relic

abstract:
  The origin of dark matter in the universe may be scalar particles produced by
amplification of quantum fluctuations during a period of dilaton-driven
inflation. We show, for the first time, that a single species of particles,
depending on its mass and interactions, can be a source of both cold and hot
dark matter simultaneously. Detection of such weakly interacting particles with
masses below a fraction of an eV presents a new challenge for dark matter
searches.


title: Higher-twist contributions in exclusive processes

abstract:
  Using the renormalon technique, we estimate higher-twist contributions in
deeply virtual Compton scattering and in hard exclusive $\pi^0$
leptoproduction.


title:
Production of qqQQ final states in ee collisions in the left-right
  symmetric model

abstract:
  We consider the reaction ee ->qqQQ as a test of lepton number
non-conservation in the framework of the left-right-symmetric electroweak
model. The main contributions to this process are due to Majorana neutrino
exchange in t-channel and doubly charged Higgs (Delta{--}) exchange in
s-channel with a pair of right-handed weak bosons (WR) as intermediate state.
We show that in a linear ee collider with the collision energy of 1 TeV (1.5
TeV) the cross section of this process is 0.01 fb (1 fb), and it will, for the
anticipated luminosity of 10**{35} cm**{-2}, be detectable below the WR
threshold. We study the sensitivity of the reaction on the masses of the heavy
neutrino, WR and Delta{--}.


title: Strange quark matter with dynamically generated quark masses

abstract:
  Bulk properties of strange quark matter (SQM) are investigated within the
SU(3) Nambu-Jona-Lasinio model. In the chiral limit the model behaves very
similarly to the MIT bag model which is often used to describe SQM.
  However, when we introduce realistic current quark masses, the strange quark
becomes strongly disfavored, because of its large dynamical mass.
  We conclude that SQM is not absolutely stable.


title: Baryon Stopping at HERA: Evidence for Gluonic Mechanism

abstract:
  Recent results from the H1 experiment [1] have confirmed the existence of a
substantial baryon asymmetry of the proton sea at small $x$ with magnitude
predicted in hep-ph/9607486. This is a strong support for the idea [3] that
baryon number can be transferred by gluons through a large rapidity interval
without attenuation. In this paper we calculate the dependence of baryon
asymmetry on associated multiplicity of produced hadrons which turns out to be
very sensitive to the underlying dynamics. Comparison with data [1] confirms
the dominance of the gluonic mechanism of baryon number transfer and excludes
any substantial contribution of valence quark exchange.


title: Alternative Interpretation of the Tevatron Top Events

abstract:
  We propose an alternative interpretation of the top events discovered at the
Tevatron in 1995. Given that the charge of the $b$ quark jet cannot be measured
for the whole sample with certainty, the signal can be due to a quark of charge
-4/3 at the reported mass, i.e. 174 GeV, while the top quark is actually
heavier, say above 230 GeV. We point out in this paper that such a scenario is
actually hinted at by the latest precision electroweak measurements of $Z$
decay. To rule out this possibility in the future, the $b$ quark jet charge
analysis has to become definitive, or the single "top" production cross section
has to be measured.


title:
New Results From Lattice QCD: Non-Perturbative Renormalization and Quark
  Masses

abstract:
  For the first time, we compute non-perturbatively, i.e. without lattice
perturbation theory, the renormalization constants of two-fermion operators in
the quenched approximation at $\beta=6.0$, 6.2 and 6.4 using the Wilson and the
tree-level improved SW-Clover actions. We apply these renormalization constants
to fully non-perturbatively estimate quark masses in the $\bar{MS}$ scheme from
lattice simulations of both the hadron spectrum and the Axial Ward Identity in
the quenched approximation. Some very preliminary unquenched Wilson results
obtained from the gluon configurations generated by the T$\chi$L Collaboration
at $\beta=5.6$ and $N_{f}=2$ are also discussed.


title:
Lower Energy Consequences of an Anomalous High-Energy Neutrino
  Cross-Section

abstract:
  A new strong-interaction has been postulated for neutrinos above ~10^{19} eV
to explain the production of highest-energy cosmic ray events. We derive a
dispersion relation relating the hypothesized high-energy cross-section to the
lower-energy neutrino-nucleon elastic amplitude. Remarkably, we find that the
real forward amplitude becomes anomalous seven orders of magnitude lower in
energy than does the total cross-section. We discuss possible measurable
consequences of this early onset of new neutrino physics, and conclude that a
significantly enhanced elastic \nu-N scattering rate may occur for the neutrino
beams available at Fermilab and CERN.


title: Bilepton Production at Hadron Colliders

abstract:
  We examine, as model-independently as possible, the production of bileptons
at hadron colliders. When a particular model is necessary or useful, we choose
the 3-3-1 model. We consider a variety of processes: q anti-q -> Y^{++} Y^{--},
u anti-d -> Y^{++} Y^{-}, anti-u d -> Y^+ Y^{--}, q anti-q -> Y^{++} e^{-}
e^{-}, q anti-q -> phi^{++} phi^{--}, u anti-d -> -> phi^{++} phi^{-}, and
anti-u d -> phi^{+} phi^{--}, where Y and phi are vector and scalar bileptons,
respectively. Given the present low-energy constraints, we find that at the
Tevatron, vector bileptons are unobservable, while light scalar bileptons
(M_phi <= 300 GeV) are just barely observable. At the LHC, the reach is
extended considerably: vector bileptons of mass M_Y <= 1 TeV are observable, as
are scalar bileptons of mass M_phi <= 850 GeV.


title:
Strings at the Intermediate Scale, or is the Fermi Scale Dual to the
  Planck Scale?

abstract:
  We show that if the string scale is identifed with the intermediate scale,
$M_s=\sqrt{M_W M_{Planck}} \sim 10^{11}$ GeV, then the notorious hierarchy,
$M_W/M_{Planck} \sim 10^{-16}$, can be explained using only $M_c/M_s \sim 0.01
\sim \alpha_{GUT} $ as small input parameters, where $M_c$ is the
compactification scale. This is possible for weakly-coupled Type-I open-string
vacua if the observed world is assumed to live in an N=1 supersymmetric 3-brane
sector coupled to a separate, hidden, 3-brane world which breaks supersymmetry,
because for such a model $M_W/M_{Planck} = 1/2 \alpha_{GUT}^2 (M_c/M_s)^6$. We
discuss some of the phenomenological issues presented by such an
intermediate-scale string, showing that its benefits include:
  (i) the possibility of logarithmic gauge-coupling unification of the SM
couplings at $M_s$;
  (ii) a natural axionic solution to the strong-CP problem with a
phenomenologically-acceptable Peccei-Quinn scale;
  (iii) experimentally-interesting neutrino masses, and more.


title:
(S)neutrino properties in R-parity violating supersymmetry: I.
  CP-conserving Phenomena

abstract:
  R-parity-violating supersymmetry (with a conserved baryon number B) provides
a framework for particle physics with lepton number (L) violating interactions.
We examine in detail the structure of the most general R-parity-violating
(B-conserving) model of low-energy supersymmetry. We analyze the mixing of
Higgs bosons with sleptons and the mixing of charginos and neutralinos with
charged leptons and neutrinos, respectively. Implications for neutrino and
sneutrino masses and mixing and CP-conserving sneutrino phenomena are
considered. L-violating low-energy supersymmetry can be probed at future
colliders by studying the phenomenology of sneutrinos. Sneutrino-antisneutrino
mass splittings and lifetime differences can provide new opportunities to probe
lepton number violation at colliders.


title: R-Invariant Topological Inflation

abstract:
  We propose a topological inflation model in the framework of supergravity
with $R$ invariance. This topological inflation model is not only free from the
initial value problem of the inflaton field but also gives low reheating
temperature which is favored in supergravity since the overproduction of
gravitinos is avoided. Furthermore, the predicted spectrum of the density
fluctuations is generally tilted, which will be tested by future observations
on CMB anisotropies and large scale structure of the universe.


title:
Lorentz Covariance and Internal Space-time Symmetry of Relativistic
  Extended Particles

abstract:
  The difference between Lorentz invariance and Lorentz covariance is discussed
in detail. A covariant formalism is developed for the internal space-time
symmetry of extended particles, especially in connection with the insightful
observations Feynman made during the period 1969-72. A Lorentz-group formalism
is presented for the harmonic oscillator model of Feynman, Kislinger and
Ravndal, which was originally based on hadronic mass spectra. This covariant
version allows us to construct a parton distribution function by
Lorentz-boosting the oscillator wave function of a hadron at rest. The role of
the time-separation variable is discussed in detail. It is shown that, due to
our inability to make measurements on this variable, it belongs to Feynman's
rest of the universe. Our failure to observe the rest of the universe leads to
an increase in entropy.


title:
The Proton Spin in the Chiral Bag Model : Casimir Contribution and
  Cheshire Cat Principle

abstract:
  The flavor singlet axial charge has been a source of study in the last years
due to its relation to the so called {\it Proton Spin Problem}. The relevant
flavor singlet axial current is anomalous, i.e., its divergence contains a
piece which is the celebrated $U_A(1)$ anomaly. This anomaly is intimately
associated with the $\eta^\prime$ meson, which gets its mass from it. When the
gauge degrees of freedom of QCD are confined within a volume as is presently
understood, the $U_A(1)$ anomaly is known to induce color anomaly leading to
"leakage" of the color out of the confined volume (or bag). For consistency of
the theory, this anomaly should be canceled by a boundary term. This ``color
boundary term" inherits part or most of the dynamics of the volume (i.e., QCD).
In this paper, we exploit this mapping of the volume to the surafce via the
color boundary condition to perform a complete analysis of the flavor singlet
axial charge in the chiral bag model using the Cheshire Cat Principle. This
enables us to obtain the hitherto missing piece in the axial charge associated
with the gluon Casimir energies. The result is that the flavor singlet axial
charge is small independent of the confinement (bag) size ranging from the
skyrmion picture to the MIT bag picture, thereby confirming the (albeit
approximate) Cheshire Cat phenomenon.


title: Proton spin structure and quark-parton model

abstract:
  The alternative to the standard formulation of the quark-parton model is
proposed. Our relativistically covariant approach is based on the solution of
the master equations relating the structure and distribution functions, which
consistently takes into account the intrinsic quark motion. It is suggested,
that the intrinsic quark motion can substantially reduce the structure function
$g_1$. Simultaneously it is suggested, that the combined analysis of the
polarized and unpolarized data can give an information about the effective
masses and intrinsic motion of the quarks inside the nucleon.


title:
Some aspects of the Standard Model in gravitational backgrounds with
  torsion

abstract:
  Torsion appears in a natural way in modern formulations of the gravitational
theories. In this work we study several aspects of the interplay between the
Standard Model and a classical gravitational background with torsion. In
particular we consider the problem of the gauge and gravitational anomalies,
$B$ and $L$ anomalies, the effective action for the torsion and the propagation
of electromagnetic radiation in the presence of torsion.


title:
Common Hierarchical Lepton Mass Textures for Atmospheric and Solar
  Neutrino Oscillations

abstract:
  We propose and study a common hierarchical mass texture for both charged
lepton and neutrino sectors. The texture gives rise to a large
$\nu_\mu\leftrightarrow\nu_\tau$ mixing. Also it leads to the small angle MSW
effect solution for solar neutrino data. It naturally gives a small
$\nu_e\leftrightarrow \nu_\tau$ oscillation relevant to the CHOOZ result in
certain mass limits.


title: From kaons to neutrinos: quantum mechanics of particle oscillations

abstract:
  The problem of particle oscillation is considered in a pedagogical and
comprehensive way. Examples from K, B and neutrino physics are given.
Conceptual difficulties of the traditional approach to particle oscillation are
discussed. It is shown how the probability current density and the wave packet
treatments of particle oscillations resolve some problems. It is also shown
that only full field theoretical approach is free from conceptual difficulties.
The possibility of oscillation of particles produced together with kaons or
neutrinos is considered in full wave packet quantum mechanics language. Precise
definition of the oscillation of particles which recoil against mixed states is
given. The general amplitude which describes the oscillation of two particles
in the final states is found. Using this EPR-type amplitude the problem of
oscillation of particles recoiling against kaons or neutrinos is resolved. The
relativistic EPR correlations on distances of the order of coherence lengths
are considered.


title: Multiparticle Production in the Soft Limit and QCD Coherence

abstract:
  The production of gluons in a jet is considered in limited phase space,
either with a cut in transverse momentum with respect to the jet axis
$k_\perp<k_\perp^{cut}$ or with a cut in absolute momentum $|\vec{k} |
<k^{cut}$. It is shown in the perturbative QCD calculations that in the soft
limit $k_\perp^{cut} \to 0$ the multiplicity distribution becomes Poissonian,
whereas for $k^{cut} \to 0$ the distribution remains non-Poissonian. The
Poissonian limit is a consequence of the soft gluon coherence in the genuine
multiparticle correlations. We also investigate how incoherent hadronization
processes could possibly modify the predictions for small cut-off parameters.


title: Searching for cold spots in multipion systems

abstract:
  Local fluctuations of pion density in momentum space may lead to
Bose-Einstein condensation. Conditions for this phenomenon to occur in in
high-energy collisions and possibilities of its experimental investigation are
discussed.


title: Small-x one-particle-inclusive quantities in the CCFM approach

abstract:
  This article presents the results of a quantitative study of the small-x data
at HERA, using the CCFM equation. The first step consists of choosing the
version of the CCFM equation to be used, corresponding to selecting a
particular subset of next-to-leading-logarithmic corrections --- the choice is
constrained by requiring a phenomenologically reasonable small-x growth. For
the time being, the parts of the splitting functions that are finite at z=0
have been left out. We then examine results for F_2^c, R, the transverse energy
flow, the charged-particle transverse-momentum spectrum and the forward-jet
cross section and compare to data. While some of the data is reproduced better
than with DGLAP-based calculations, the agreement is not entirely satisfactory,
suggesting that the approach developed here is not yet suitable for detailed
phenomenology. We discuss why, and suggest directions for future work.


title: Charmonium Production at Tevatron, HERA and LHC

abstract:
  Charmonia hadro- and photo-production are analyzed in the framework of the
color-octet model taking into account higher-order effects induced by
initial-state radiation of gluons. We argue that color-octet matrix elements
obtained from Tevatron data might be reconciled with those extracted from HERA
data on inelastic $J/\psi$ photoproduction. Finally we estimate cross sections
for events with muons from prompt $J/\psi$'s as a background for the B physics
programme at LHC experiments.


title: The Leading Power Corrections to the Structure Functions

abstract:
  We show that when Bjorken $x_B$ is large, the leading order twist-four
contributions to the structure functions can be expressed in terms of the
derivatives of the normal twist-two parton distributions. Our analytical
results are not only consistent with the parameterized power corrections
extracted from the data, but also predict the flavor dependence of the power
corrections. We also discuss the impact of our analytical results on the
extraction and the flavor separation of the parton distributions at large $x$.


title:
A heavy quark effective field lagrangian keeping particle and
  antiparticle mixed sectors

abstract:
  We derive a tree-level heavy quark effective Lagrangian keeping
particle-antiparticle mixed sectors allowing for heavy quark-antiquark pair
annihilation and creation. However, when removing the unwanted degrees of
freedom from the effective Lagrangian one has to be careful in using the
classical equations of motion obeyed by the effective fields in order to get a
convergent expansion on the reciprocal of the heavy quark mass. Then the
application of the effective theory to such hard processes should be sensible
for special kinematic regimes as for example heavy quark pair production near
threshold.


title: Higgs- and Goldstone bosons-mediated long range forces

abstract:
  In certain mild extensions of the Standard Model, spin-independent long range
forces can arise by exchange of two very light pseudoscalar spin--0 bosons. In
particular, we have in mind models in which these bosons do not have direct
tree level couplings to ordinary fermions. Using the dispersion theoretical
method, we find a $1/r^{3}$ behaviour of the potential for the exchange of very
light pseudoscalars and a $1/r^{7}$ dependence if the pseudoscalars are true
massless Goldstone bosons.


title: Diffraction at HERA - An Experimentalist's View

abstract:
  Diffraction studies at HERA are introduced, with reference to other
communications to this Conference. Motivations and specific features of the
experimental approaches are stressed.


title:
CP Violation in a two-Higgs doublet model for the top quark: B to psi
  K_S

abstract:
  We explore charged-Higgs CP-violating effects in an intriguing two-Higgs
doublet model which accords special status to the top quark. In this model the
heaviness of the top quark originates naturally from the much larger VEV of the
second Higgs doublet compared to that of the first. The phenomenology of this
model is quite distinct from that of the usual formulations of the two-Higgs
doublet model. In particular, the model can easily account for the observed CP
violation in the kaon sector even if the CKM matrix is real. The associated
non-standard CP phase can be monitored through measurements of the
time-dependent CP asymmetry in B to psi K_S in experiments at the upcoming
B-factories.


title: Models of dynamical supersymmetry breaking and quintessence

abstract:
  We study several models of relevance for the dynamical breaking of
supersymmetry which could provide a scalar component with equation of state
$p=w\rho$, $-1<w<0$. Such models would provide a natural explanation for recent
data on the cosmological parameters.


title: Implication of Super-Kamiokande Data on R-parity Violation

abstract:
  R-parity violating bilinear (soft) terms in the supersymmetric standard model
would be the leading source for nonzero neutrino masses and mixing. We point
out that the mixing between neutralinos (charginos) and neutrinos (charged
leptons) driven by the bilinear terms take factorized forms, which may enable
us to probe the neutrino mixing parameters in a collider. It is then shown that
the Super-Kamiokande data on atmospheric neutrinos require all the baryon
number violating couplings to be substantially suppressed: $\lambda''_{\rm any}
<10^{-9}$.


title:
New two-loop contribution to electric dipole moment in supersymmetric
  theories

abstract:
  We calculate a new type of two-loop contributions to the electric dipole
moments of the electron and neutron in supersymmetric theories. The new
contributions are originated from the potential CP violation in the trilinear
couplings of the Higgs bosons to the scalar-top or the scalar-bottom quarks.
These couplings were previously very weakly constrained. The electric dipole
moments are induced through a mechanism analogous to that due to Barr and Zee.
We find observable effects for a sizeable portion of the parameter space
related to the third generation scalar-quarks in the minimal supersymmetric
standard model which cannot be excluded by earlier considerations.


title: MeV Tau Neutrino in Gauge Mediated Supersymmetry Breaking Model

abstract:
  A supersymmetric model which naturally accommodates MeV tau neutrino within
the framework of gauge mediated supersymmetry breaking is described. The lepton
number violation is originally introduced in the messenger sector of the
theory. A large slepton-Higgs mixing mass and a small lepton-higgsino mixing
mass are generated at one-loop. Scalar tau neutrino has non-vanishing vacuum
expectation value. These result in a non-zero \nu_{\tau} mass which is in the
range of (1-10) MeV.


title:
Analytical solution for multivariate statistics in random multiplicative
  cascades

abstract:
  It has long been a puzzle how to solve random multiplicative cascade
structures analytically. We present an analytical solution found recently in
the form of a simple pedagogical example of the general case.


title:
The Oscillation Length Resonance in the Transitions of Solar and
  Atmospheric Neutrinos Crossing the Earth Core

abstract:
  The characteristic features of the neutrino oscillation length resonance,
taking place in the $\nu_2 \to \nu_{e}$ and $\nu_{\mu} \to \nu_{e}$ ($\nu_e \to
\nu_{\mu (\tau)}$) transitions in the Earth of the solar and atmospheric
neutrinos crossing the Earth core, are reviewed. The resonance enhances
dramatically these transitions at small mixing angles but differs from the MSW
one. It can be responsible, e.g., for the small excess of e-like events at
Zenith angles $\theta_{z} \sim (130^{\circ} - 180^{\circ})$ and can produce at
least part of the Zenith angle dependence of the rate of $\mu-$like events,
exhibited by the Super-Kamiokande atmospheric neutrino data.


title:
A Fixed-Order Calculation of the Heavy-Quark Fragmentation Function in
  e+e- Collisions

abstract:
  We use a recently completed O(alpha_s^2) fixed-order calculation of the
heavy-flavour production cross section in e+e- collisions to compute the
heavy-quark fragmentation function. We fit the result of our calculation,
convoluted with a Peterson fragmentation function, to available data for charm
production, and thus obtain a value for the parameter epsilon in the Peterson
function. We discuss the relevance of mass effects and of subleading terms in
our calculation.


title:
A study of the pi^0pi^0 system produced in charge exchange and central
  collisions

abstract:
  A study of the $\pi^0\pi^0$ system produced in charge exchange $\pi^-p$
collisions at 38 and 100 GeV/c and in central $pp$ interactions at 450 GeV/c
has been carried out. The $S$ wave has rather a complicated structure in both
processes indicating the existence of several scalar resonances. The $f_0(980)$
and $f_0(1500)$ appear as dips at 1 and 1.5 GeV in the $S$ wave for charge
exchange reaction, and as shoulders at these masses in the $S$ wave for central
production. The production of the $f_0(980)$, $f_0(1300)$ and $f_0(1500)$ in
the reaction $pp \to p_f\pi^0\pi^0p_s$ as a function of the $dP_{T}$
kinematical filter shows the behaviour differed from what has been observed for
the undisputed $q\bar{q}$ mesons. An extra $f_0(2000)$ state is seen in the $S$
wave for charge exchange reaction as a dip at 2 GeV. Resonances with higher
spins, $f_2(1270)$, $f_4(2050)$ and $f_6(2510)$, have also been studied. All
the three mesons are produced in the reaction $\pi^-p\to\pi^0\pi^0{n}$ mainly
via an one-pion exchange for small $-t$, whereas a natural-parity exchange
domimates for large $-t$. The behaviour of the centrally produced $f_2(1270)$
as a function of the $dP_{T}$ is consistent with what has been observed for
other $q\bar{q}$ states.


title: Extracting m_c(M_c) and f_{D_s,B} from the pseudoscalar sum rules

abstract:
  I report here on the (first) direct extraction of the running charm quark
mass m_c(\nu) from the D-meson sum rules, and on the implications of this
result for the estimate of the leptonic decay constants f_{D_s}. The outputs:
m_c(M_c)=(1.08\pm 0.11) GeV, f_{D}= (1.52\pm 0.16)f_\pi, f_{D_s}= (1.75\pm
0.18)f_\pi and f_B=(1.44\pm 0.07)f_\pi are in good agreement with the existing
sum rule results obtained using the pole mass. In particular, the result
f_D\approx f_B supports early '87 sum rule results \cite{SNFB}, which indicated
a huge 1/m correction to the heavy quark symmetry expectation. This talk is
based on the paper hep-ph/9712386 and updates the discussions given there.


title:
Constraints on anomalous charged current couplings, tau neutrino mass
  and fourth generation mixing from tau leptonic branching fractions

abstract:
  We use recent experimental measurements of tau branching fractions to
determine the weak charged current magnetic and electric dipole moments of the
tau and the Michel parameter $\eta$ with unprecedented precision. These results
are then used to constrain the tau compositeness scale and the allowed
parameter space for Higgs doublet models. We also present new constraints on
the mass of the tau neutrino and its mixing with a fourth generation neutrino.


title: QCD Tests in Hadronic Final States

abstract:
  Various QCD studies based on jet observables in hadronic final states in
deep-inelastic scattering and hadron-hadron collisions are presented. Measured
quantities are event shape variables, jet rates and jet cross sections. QCD
analyses have been performed to determine the value of the strong coupling
constant $\alpha_s(M_z)$, the gluon density in the proton and to test power
corrections.


title:
Complete analysis of photino-mediated lepton flavor violaitons in
  generalized supersymmetric models

abstract:
  We consider lepton flavor violations (LFV) mediated by photino as a result of
the nondiagonal slepton mass matrices in general supersymmetric models. Using
the experimental upper bounds on l \to l' + gamma and mu^- + Ti \to e^- + Ti as
constraints on the flavor changing slepton mass insertions, we predict the
possible ranges of the upper limits on the branching ratios of other LFV
processes such as l \to 3l', tau \to l_{i\neq 3} + pi^0 (or eta, rho^0, phi),
Z^0 \to l_i bar{l}_{j\neq i}, and muonium \to antimuonium conversion. Most of
these decays are expected to occur with small branching ratios far below the
current or future experimental search limits. We also derive constraints on the
flavor conserving mass insertions from the anomalous magnetic moments of
leptons.


title: Spectroscopy of doubly heavy baryons

abstract:
  Spectra of masses are calculated for the families of doubly heavy baryons in
the framework of nonrelativistic quark model with the QCD potential by
Buchmuller--Tye. We suppose the quark-diquark structure for the wave functions
and take into account the spin-dependent splittings. The physical reasons
causing the existence of quazi-stable excited states in the subsystem of heavy
diquark are considered for the heavy quarks of identical flavors.


title: Gauge Independent Effective Potential and the Higgs Mass Bound

abstract:
  We introduce the Vilkovisky-DeWitt formalism for deriving the lower bound of
the Higgs boson mass.
  We illustrate the formalism with a simplified version of the Standard
Electroweak Model, where all charged boson fields as well as the bottom-quark
field are disregarded. The effective potential obtained in this approach is
gauge independent. We derive from the effective potential the mass bound of the
Higgs boson. The result is compared to its counterpart obtained from the
ordinary effective potential.


title:
Impact Parameter Dependences of the Number of Interacting Nucleons and
  Mean Multiplicities in High Energy Heavy Ion Interactions

abstract:
  We consider the dependences of the average number of interacting nucleons in
high energy heavy ion collisions on the impact parameter in two cases, when the
colliding nuclei have equal atomic weights, and when one nucleus is
significantly more heavy in comparison with the second one. We argue that in
the case of trigger of some rare event (say, $J/\psi$, or $\Upsilon$
production) the multiplicity of the secondaries can change several times for
minimum bias sample, but it should be stable in the case of central events.


title:
Neutrinos in a gravitational background: a test for the universality of
  the gravitational interaction

abstract:
  In this work we propose an extended formulation for the interaction between
neutrinos and gravitational fields. It is based on the parametrized
post-Newtonian aproach, and includes a violation of the universality of the
gravitational interaction which is non diagonal in the weak flavor space. We
find new effects that are not considered in the standard scenario for violation
of the equivalence principle. They are of the same order as the effects
produced by the Newtonian potential, but they are highly directional dependent
and could provide a very clean test of that violation. Phenomenological
consequences are briefly discussed.


title:
Single top Quark Production in e-gamma Collisions and Testing
  Technicolor Models

abstract:
  We study the single top quark production process in various kinds of
technicolor models in high energy positron photon collisions at the future
electron positron linear colliders. It is shown that if there is certain
charged pseudo Goldstone boson (PGB) coupling to t(anti-b), the
t(anti-b)-channel PGB contribution is dominant, but the situation is quite
different from that in the neutral channel, t(anti-t) production in photon
photon collisions, due to the destructive nature of different amplitudes. At
the DESY limear collider TESLA, the event rates in models with
t(anti-b)-channel PGB contributions, such as the top-color-assisted technicolor
model, etc. are experimentally measurable. This process provides a feasible
test of technicolor models with t(abti-b)-channel PGB contributions.


title: The Correlator of Topological Charge Densities at low $Q^2$ in QCD

abstract:
  The correlator of topological charge densities $\chi(Q^2)$ in QCD is
calculated in the domain of low $Q^2$. Basing on the Ward identities the low
energy theorems are proved. The value of the first derivative
$\chi^{\prime}(0)$ found recently by QCD sum rules \cite{1} is used. The
contributions of pseudoscalar quasi-Goldstone bosons as intermediate states in
the correlator are calculated with the account of $\eta-\pi$ mixing.


title: The Distribution of Constituent Charm Quarks in the Hadron

abstract:
  Using a statistical approach in the framework of non-covariant perturbation
theory the distributions for light and charmed quarks in the hadron have been
derived, taking into account the mass of the charmed quark. The parameters of
the model have been extracted from the comparison with NA3 data on
hadroproduction of J/psi particles. A reanalysis of the EMC data on charm
production in muon-nucleon scattering has been performed. It has been found in
comparison with the conventional source of charmed quarks from photon-gluon
fusion, that the EMC data indicate the presence of an additional contribution
from deep-inelastic scattering on charmed quarks at large x. The resulting
admixture of the Fock states, containing charmed quarks in the decomposition of
the proton wave function is of the order of 1%. The approach presented for the
excitation of the Fock states with charmed quarks can also be applied to states
with beauty quarks as well as to the hadronic component of the virtual photon
(resolved photon component).


title: Spin Polarization in Single Top Events

abstract:
  We discuss the optimal spin bases for describing angular correlations in
single top quark events at the Fermilab Tevatron. We define spin bases that
exploit the fact that the top quarks are produced with 100% polarization along
the momenta of the d-type quarks in these events. For single top production
through an s-channel W boson, 98% of the top quarks have their spins in the
antiproton direction. For single top production via Wg-fusion, 96% of the top
quarks have their spins in the spectator jet direction. The direction of the
top quark spin is reflected in the angular correlations of its decay products.


title: Exclusive electroproduction and off-diagonal parton distributions

abstract:
  Off-diagonal parton distributions occur in several hard exclusive reactions.
They extend the study of hadron structure beyond what can be learned from
ordinary distributions and have a particularly rich spin structure. The hard
scattering subprocesses in electroproduction of mesons and of real photons
satisfy helicity selection rules, which provide powerful tools to test
leading-twist dominance at a given value of the hard scale.


title: Tau neutrinos from active galactic nuclei

abstract:
  We study the appearance of $\nu_{\tau}$ from active galactic nuclei (AGN)
through neutrino spin-flip. We consider two situations: i) Spin
(flavour)-precession in a reasonable strength of magnetic field in AGN,
$B_{AGN}$ ii) Adiabatically resonant conversions caused by an interplay of
$B_{AGN}$ and the violation of equivalence principle. Observational
consequences for both situations are discussed.


title: The Glueball Filter in Central Production and Broken Scale Invariance

abstract:
  We propose a possible explanation of the kinematical dependence of the
central production of the scalar glueball candidate observed recently by the
WA91 and WA102 Collaborations, and discussed by Close and Kirk, in the context
of the broken scale invariance of QCD. The dependences of glueball production
on the transverse momenta and azimuthal angles of the final-state protons may
be related to the structure of the trace anomaly in QCD.


title: Compton scattering and nonforward parton distributions

abstract:
  The hard exclusive electroproduction processes provide new information about
hadronic structure accumulated in nonforward parton distributions. The NFPD's
are universal hybrid functions having the properties of parton densities,
hadronic form factors and distribution amplitudes. They give a unified
description of various hard exclusive and inclusive reactions. The basic
supplier of information about nonforward parton distributions is deeply virtual
Compton scattering which offers a remarkable example of Bjorken scaling
phenomena in exclusive processes. Wide-angle real Compton scattering is an
ideal tool to test angle-dependent scaling laws characteristic for soft overlap
mechanism. Hard meson electroproduction is the best candidate to see pQCD hard
gluon exchange in exclusive reactions.


title: Renormalized Effective QCD Hamiltonian: Gluonic Sector

abstract:
  Extending previous QCD Hamiltonian studies, we present a new renormalization
procedure which generates an effective Hamiltonian for the gluon sector. The
formulation is in the Coulomb gauge where the QCD Hamiltonian is renormalizable
and the Gribov problem can be resolved. We utilize elements of the Glazek and
Wilson regularization method but now introduce a continuous cut-off procedure
which eliminates non-local counterterms. The effective Hamiltonian is then
derived to second order in the strong coupling constant. The resulting
renormalized Hamiltonian provides a realistic starting point for approximate
many-body calculations of hadronic properties for systems with explicit gluon
degrees of freedom.


title: QCD sum rules and soft-hard interplay for hadronic form factors

abstract:
  We discuss two types of contributions to hadronic form factors in QCD: hard
gluon exchange and soft wave function overlap. Within the QCD sum rule
approach, the hard contribution has strong numeric suppression by factor
(\alpha_s/\pi) ~ 0.1 for each exchange. For this reason, the soft contribution
dominates at accessible momentum transfers. The ``humpy'' distribution
amplitudes used to enhance hard terms cannot be derived from QCD sum rules in a
self-consistent way. The estimates of soft terms obtained within the local
quark-hadronic duality approach in all cases are close to existing data,
providing an experimental evidence that hard terms are small.


title: Non-Spectator Contributions to Inclusive Charmless $B$ Decays

abstract:
  The light quarks inside $B$ mesons are usually treated as spectators and do
not affect the decay rates which are assumed to be purely due to b quark
decays. In this paper we calculate the non-spectator contributions to inclusive
charmless $B$ decays due to the spectator effects. We find that the
non-spectator contributions to the branching ratio for $\bar B^0$ are small
($<2\times 10^{-4}$), but the contributions to $\Delta S = 0$ and $\Delta S =
-1$, $B^-$ decay branching ratios can be as large as $-7.5\times 10^{-4}$ and
$2\times 10^{-3}$, respectively. These contributions may play an important role
in rare charmless $B$ decays.


title:
Quark Condensation, Induced Symmetry Breaking and Color
  Superconductivity at High Density

abstract:
  The phase structure of hadronic matter at high density relevant to the
physics of compact stars and relativistic heavy-ion collisions is studied in a
low-energy effective quark theory. The relevant phases that figure are (1)
chiral condensation, (2) diquark color condensation (color superconductivity)
and (3) induced Lorentz-symmetry breaking (ISB). For reasonable strengths for
four-Fermi interactions implied by one-gluon exchange quark interactions as
well as instanton-mediated interactions, we find that the ISB phase sets in at
a moderate density while the quark condensate vanishes, followed by color
superconductivity associated with scalar diquark condensation appearing only at
an asymptotic density. Lack of confinement in the model makes the result of
this analysis only qualitative but the hierarchy of the transitions we find
seems to be quite robust.


title: Searches for Sterile Neutrinos at Reactor

abstract:
  We show that in a reactor disappearance oscillation experiment the
sensitivity to the mixing parameter can be substantially improved for $(1 -
5\cdot10^{-4}) eV^{2}$ mass parameter range which includes both the LSND and
the atmospheric neutrino oscillation regions. The objectives are: to search for
the sterile neutrinos and to get a better understanding of the atmospheric
neutrino oscillation mechanism. The parameters of the underground (600 m.w.e.)
Krasnoyarsk reactor and data from the CHOOZ reactor oscillation experiment are
used to estimate the effect and background rates.


title: Investigations of Quark Fragmentation Universality

abstract:
  We propose event cuts in deep inelastic scattering, suitable for an
examination of quark fragmentation universality. We compare the current
hemisphere of the Breit frame with hemispheres in e+e- annihilation events,
using Monte Carlo simulations. The agreement between the two processes is
improved after the suggested events cuts. A method to study the scale evolution
in quark hemispheres using data from fixed energy e+e- experiments is
presented. This makes it possible to use the high statistics from LEP1 also at
scales below the Z mass. We also discuss observables which are sensitive to the
dynamics of regions closer to the remnant. The observables probes the
relatively clean region on the current side of the hardest emission in the
event, and can be used to distinguish between different assumptions about
remnant effects and mechanisms for the parton evolution.


title: A study of Double Pomeron Exchange in ALICE

abstract:
  The non-Abelian nature of QCD suggests that particles that have a gluon
constituent, such as glueballs or hybrids, should exist. Experiments WA76, WA91
and WA102 have performed a dedicated search for these states in central
production using the CERN Omega Spectrometer. New results from central
production show that there is a kinematical filter which can select out
glueball candidates from known qqbar states. A further study of this at high
energies is essential in order to get information on the M(X0) > 2 GeV region.
This paper describes how this could be done using the the ALICE detector at the
LHC.


title: N Delta - Transition Form Factors at Low Momentum Transfer

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. Furthermore, the role
of presently unknown low energy constants that affect the values of EMR and CMR
is elucidated.


title: The Neutrino Magnetic Moment Induced by Leptoquarks

abstract:
  Allowing leptoquarks to interact with both right-handed and left-handed
neutrinos (i.e., ``non-chiral'' leptoquarks), we show that a non-zero neutrino
magnetic moment can arise naturally. Although the mass of the non-chiral vector
leptoquark that couples to the first generation fermions is constrained
severely by universality of the $\pi^+$ leptonic decays and is found to be
greater than 50 TeV, the masses of the second and third generation non-chiral
vector leptoquarks may evade such constraint and may in general be in the range
of $1\sim 100$ TeV. With reasonable input mass and coupling values, we find
that the neutrino magnetic moment due to the second generation leptoquarks is
of the order of $10^{-12}\sim 10^{-16} \mu_{\rm B}$ while that caused by the
third generation leptoquarks, being enhanced significantly by the large top
quark mass, is in the range of $10^{-10}\sim 10^{-14} \mu_{\rm B}$.


title: Hints from the Standard Model for Particle Masses and Mixings

abstract:
  The standard model taken with a momentum space cut-off may be viewed as an
effective low energy theory. The structure of it and its known parameters can
give us hints for relations between these parameters. In the present
investigation the Higgs problem will be discussed, the possible connection of
the Higgs meson with the heavy top quark, and the geometric structure of the
quark and lepton mass matrices.


title: Vacuum Stability Bounds in the Two-Higgs Doublet Model

abstract:
  In the standard model, the requirements of vacuum stability and the validity
of perturbation theory up to the unification scale force the mass of the Higgs
boson to be approximately between 130 GeV and 180 GeV. We re-examine these
requirements in the (non-supersymmetric) two-Higgs doublet model, in the light
of the large top quark mass, and constrain the masses of the Higgs bosons in
this model. It is found that the mass of the charged Higgs boson must be
lighter than 150 GeV. This bound is below the lower bound in the popular
model-II two-Higgs doublet model, and thus we conclude that this model cannot
be valid up to the unification scale. The bounds on the neutral Higgs scalars
are also discussed.


title: Phase Effect of A General Two-Higgs-Doublet Model in $b\to s\gamma$

abstract:
  In a general two-Higgs-doublet model (2HDM), without the {\it ad hoc}
discrete symmetries to prevent tree-level flavor-changing-neutral currents, an
extra phase angle in the charged-Higgs-fermion coupling is allowed. We show
that the charged-Higgs amplitude interferes destructively or constructively
with the standard model amplitude depending crucially on this phase angle. The
popular model I and II are special cases of our analysis. As a result of this
phase angle the severe constraint on the charged-Higgs boson mass imposed by
the inclusive rate of $b\to s\gamma$ from CLEO can be relaxed. We also examine
the effects of this phase angle on the neutron electric dipole moment.
Furthermore, we also discuss other constraints on the charged-Higgs-fermion
couplings coming from measurements of $B^0-\bar{B^0}$ mixing, $\rho_0$, and
$R_b$.


title:
Measurement and Phenomenology of the Proton Structure Function $F_2$
  from ZEUS at HERA

abstract:
  Measurements of the proton structure function $F_2$ in the $Q^2$ range $0.6 -
17 \rm GeV^2$ from ZEUS 1995 shifted vertex data and $Q^2 \simeq 1.5 - 20000
\rm GeV^2$ from 1996 and 1997 ZEUS data are presented. From the former and
other ZEUS $F_2$ data the slopes $d F_2 / d \ln Q^2$ at fixed $x$ and $d F_2 /
d \ln(1/x)$ at fixed $Q^2$ are derived. $F_2$ data at $Q^2$ below $0.9 \rm
GeV^2$ are described successfully by a combination of generalised vector meson
dominance and Regge theory. Using a NLO QCD fit the gluon density in the proton
is extracted in the range $3 \times 10^{-5} < x < 0.7$ from ZEUS 1994 and 1995
data. For $Q^2 \sim 1 \rm GeV^2$ it is found that the $q \bar{q}$ sea
distribution is still rising at small $x$ whereas the gluon distribution id
strongly suppressed. It is shown that these observations may be understood from
the behaviour of the $F_2$ and $d F_2 / d \ln Q^2$ data themselves.


title: Top-Charm Associated Production in High Energy $e^+e^-$ Collisions

abstract:
  The possibility of exploring the flavor changing neutral current
$tcZ/tc\gamma$ couplings in the production vertex for the reaction $\epem\to
t\bar c + \bar tc$ is examined. Using a model independent parameterization for
the effective Lagrangian to describe the most general three-point interactions,
production cross sections are found to be relatively small at LEP II, but
potentially sizeable at higher energy \epem colliders. The kinematic
characteristics of the signal are studied and a set of cuts are devised for
clean separation of the signal from background. The resulting sensitivity to
anomalous flavor changing couplings at LEP II with an integrated luminosity of
$4\times 500$ pb$^{-1}$ is found to be comparable to their present indirect
constraints from loop processes, while at higher energy colliders with $0.5-1$
TeV center-of-mass energy and 50-200 fb$^{-1}$ luminosity, one expects to reach
a sensitivity at or below the percentage level.


title: Universality in Effective Strings

abstract:
  We demonstrate that, due to the finite thickness of domain walls, and the
consequent ambiguity in defining their locations, the effective string
description obtained by integrating out bulk degrees of freedom contains
ambiguities in the coefficients of the various geometric terms. The only term
with unambiguous coefficient is the zeroth order Nambu-Goto term. We argue that
fermionic ghost fields which implement gauge-fixing act to balance these
ambiguities. The renormalized string tension, obtained after integrating out
both bulk and world-sheet degrees of freedom, can be defined in a scheme
independent manner; and we compute the explicit finite expressions, to
one-loop, for the case of compact quantum electrodynamics and phi-4 theory.


title: B decays in the upsilon expansion

abstract:
  Theoretical predictions for B decay rates are rewritten in terms of the
Upsilon(1S) meson mass instead of the b quark mass, using a modified
perturbation expansion. The theoretical consistency of this expansion is shown
both at low and high orders. Our method improves the behavior of the
perturbation series for semileptonic and nonleptonic inclusive decay modes, as
well as for exclusive decay form factors. The results are applied to the
determination of the semileptonic B branching ratio, charm counting, the ratio
of B -> X tau nu and B -> X e nu decay rates, and form factor ratios in B -> D*
e nu decay. We also comment on why it is not possible to separate perturbative
and nonperturbative effects in QCD.


title: Baryogenesis with Scalar Bilinears

abstract:
  We show that if a baryon asymmetry of the universe is generated through the
out-of-equilibrium decays of heavy scalar bilinears coupling to two fermions of
the minimal standard model, it is necessarily an asymmetry conserving $(B-L)$
which cannot survive past the electroweak phase transition because of
sphalerons. We then show that a surviving $(B-L)$ asymmetry may be generated if
the heavy scalars decay into two fermions, \underline {and into two light
scalars} (which may be detectable at hadron colliders). We list all possible
such trilinear scalar interactions, and discuss how our new baryogenesis
scenario may occur naturally in supersymmetric grand unified theories.


title: A Bound on Violations of Lorentz Invariance

abstract:
  Recently Coleman and Glashow [1] have developed a model which allows the
introduction of a small violation of Lorentz invariance. Observational
signatures arise because this interaction also violates flavor conservation and
allows the radiative decay of the muon, $\mu \to e + \gamma$, whose branching
ratio increases as b $\gamma^4$ where $\gamma$ is the Lorentz factor of the
muon with respect to the reference frame in which the dipole anisotropy of the
universal microwave radiation vanishes. In this paper we place a bound of b$<
10^{-25}$ based on observations of horizontal air showers with $n_e \geq 5
\times 10^6$. With such small values of b the proposed radiative decay of the
muon will not affect the functioning of the muon collider.(THIS IS A
PRELIMINARY VERSION)


title: Gluon- vs. Sea quark-Shadowing

abstract:
  We calculate the shadowing of sea quarks and gluons and show that the
shadowing of gluons is {\it not} simply given by the sea quark shadowing,
especially at small $x$. The calculations are done in the lab frame approach by
using the generalized vector meson dominance model. Here the virtual photon
turns into a hadronic fluctuation long before the nucleus. The subsequent
coherent interaction with more than one nucleon in the nucleus leads to the
depletion $\sigma (\gamma^* A) < A\sigma (\gamma^* N)$ known as shadowing. A
comparison of the shadowing of quarks to E665 data for $^{40}Ca$ and $^{207}Pb$
shows good agreement.


title:
Phase diagram of 3D SU(3) gauge-adjoint Higgs system and C- violation in
  hot QCD

abstract:
  Thermally reduced QCD leads to three dimensional SU(3) gaugefields coupled to
an adjoint scalar field $A_0$. We compute the effective potential in the
one-loop approximation and evaluate the VEV's of $TrA_0^2$ and $TrA_0^3$. In
the Higgs phase not only the former, but also the latter has a VEV. This
happens where the SU(3) gauge symmetry is broken minimally with U(2) still
unbroken. The VEV of the cubic invariant breaks charge conjugation and CP. It
is plausible that in the Higgs phase one has a transition for large enough
Higgs selfcoupling to a region where $TrA_0^3$ has no VEV and where the
gaugesymmetry is broken maximally to $U(1)\times U(1)$. For a number of colours
larger than 3 an even richer phase structure is possible.


title: Nucleon Spin Structure and Large $p_T$ Processes at $pp$ Colliders

abstract:
  QCD motivated polarized parton distributions, evolved directly in $x$-space,
are used to predict rates for prompt photon production at RHIC centre of mass
energies. Various scenarios for the polarized gluon distributions are
considered and compared, and the possibility of using large $p_T$ processes in
polarized $pp$ collision experiments to choose between them is analyzed.


title: New Results on the Theoretical Precision of the LEP/SLC Luminosity

abstract:
  We consider the error budget for the calculation of the LEP/SLC luminosity in
the Monte Carlo event generator BHLUMI4.04 from the standpoint of new
calculations of the exact result for the O(alpha) correction to the process e+
e- -> e+ e- + gamma in the low angle luminosity regime at SLC/LEP energies, for
the double bremsstrahlung effect e+ e- -> e+ e- + gamma gamma in this regime,
and for the size of the two-loop virtual correction to e+ e- -> e+ e- in this
regime in context of Yennie-Frautschi-Suura exponentiation. We find that the
error on the O(alpha**2) photonic correction can be reduced from the currently
published value 0.1% to the value 0.027%. This leads to an over-all precision
tag for the currently available program BHLUMI4.04 of 0.061%. This reduction of
the precision of the calculation is important for the final LEP1 EW precision Z
physics tests of the Standard Model.


title: Inclusive Dilepton Production at RHIC

abstract:
  jWe review recent research on Initial Value Problems in Quantum Field Theory.
We pay special attention to the chiral phase transition in the linear sigma
model. We discuss conditions for the development of Disoriented Chiral
Condensates and show how their presence affects both the pion inclusive
distribution and the dilepton distribution. We discuss the use of Schwinger's
closed time path formalism for determining inclusive distribution functions.


title:
Spin Structure of the Proton and Large p_T Processes in Polarized pp
  Collisions

abstract:
  QCD motivated polarized parton distributions, evolved directly in x-space,
are used to predict rates for prompt photon and Jet production at RHIC and
HERA-N center of mass energies. Various scenarios for the polarized gluon
distributions are considered and compared, and the possibility of using large
p_T processes in polarized pp collision experients to choose between them is
analyzed.


title: Tau Signals at the Tevatron for Gauge Mediated Supersymmetry Breaking

abstract:
  We consider the phenomenology of GMSB models where the lighter stau is the
next to lightest supersymmetric particle. In this situation, the dominant
signals for supersymmetry are events with two or three high p_T tau leptons
accompanied by large missing transverse energy. We find that the inclusive two
tau jets signature could be observable at the Tevatron's Run II, while the
inclusive three tau jets signature could be important at Run III.