title:
Heavy-quark binding and kinetic energies in heavy-light mesons and the
  constituent quark model

abstract:
  The spin-averaged binding energy and the hyperfine mass splitting of
heavy-light mesons are investigated within the constituent quark model as a
function of the inverse heavy-quark mass. It is shown that the so-called
heavy-quark kinetic energy, -lambda1 / 2mQ, may differ remarkably from the
non-relativistic expectation <p**2> / 2mQ, thanks to relativistic effects in
the effective interquark potential for heavy-light mesons, which may yield
substantial 1 / mQ corrections to the heavy-quark static limit. The
determination of the difference of the hadronic parameter lambda1 in the
B(u(d)) and B(c) mesons can provide information about the strength of
relativistic effects in the interquark interaction.


title: Recent tests of parton hadron duality in multiparticle final states

abstract:
  A large variety of jet properties can be described perturbatively by evolving
the parton cascade down to small scales of order of a few 100 MeV. We discuss
two recent applications of this approach: 1. the soft limit of the particle
spectrum which is nearly energy independent as expected for the soft gluon
bremsstrahlung; further tests of this interpretation in $e^+e^-$ and DIS are
presented; 2. the steep decrease of the distribution of rapidity gaps in
$e^+e^-$ annihilation can be explained by the Sudakov formfactor for quark
jets.


title: Two-Particle Correlations and $B^0\bar{B}^0$ Mixing

abstract:
  We study the EPR correlation implied by the entangled wavefunction of the
$B^0\bar{B}^0$ pair created by the $\Upsilon $(4S) resonance. The analysis uses
the basis provided by the mass eigenstates $B_1,B_2$ rather than the flavour
states $B^0, \bar{B}^0$. Data on the inclusive dilepton charge ratio are close
to the expectation of quantum mechanics, but nearly 8 standard deviations away
from that of complete decoherence.


title: Supergravity Radiative Effects on Soft Terms and the $\mu$ Term

abstract:
  We compute quadratically divergent supergravity one-loop effects on soft
supersymmetry-breaking parameters and the $\mu$ term in generic hidden sector
supergravity models. These effects can significantly modify the matching
condition for soft parameters at the Planck scale and also provide several new
sources of the $\mu$ term which are naturally of order the weak scale. We also
discuss some phenomenological implications of these effects, particularly the
violation of the scalar mass universality which may lead to dangerous FCNC
phenomena, and apply the results to superstring effective supergravity models.


title:
Polarizabilities and parity non-conservation in the Cs atom and limits
  on the deviation from the standard electroweak model

abstract:
  A semi-empirical calculation of the 6s - 7s Stark amplitude $\alpha$ in Cs
has been performed using the most accurate measurements and calculations of the
electromagnetic amplitudes available. This is then used to extract the
parameters of the electroweak theory from experimental data. The results are:
$\alpha = 269.0 (1.3) a_0^3$, weak charge of Cs $Q_W = -72.41(25)_{exp}
(80)_{theor}$, deviation from the Standard model $S = -1.0(.3)_{exp}
(1.0)_{theor}$ and limit on the mass of the extra Z-boson in SO(10) model
$M_{Z_x} > 550 GeV$.


title:
Production and Decay of Stops and Sbottoms, and Determination of SUSY
  Parameters

abstract:
  We present numerical predictions for the decay branching ratios of the
heavier stop and sbottom mass eigenstates. We estimate the precision to be
expected for the determination of the underlying supersymmetry parameters of
the stop and sbottom systems.


title: Higgs Particle Decays in Supersymmetry

abstract:
  We present a detailed study of the decays of the Higgs bosons $H^+$, $H^0$,
and $A^0$ within the Minimal Supersymmetric Standard Model including SUSY--QCD
corrections. We find that the supersymmetric modes $\tilde t \bar{\tilde b}$
($\tilde t \bar{\tilde t}$, and for large $\tan\beta$ $\tilde b \bar{\tilde
b}$) can dominate the $H^+$ ($H^0$, $A^0$) decays in a wide range of the model
parameters due to the large Yukawa couplings and mixings of $\tilde t$ and
$\tilde b$. Compared to the conventional modes $H^+ \to \tau^+ \nu_{\tau}, t
\bar b$, and $H^0, A^0 \to t \bar t, b \bar b$, the supersymmetric modes can
have an important impact on the Higgs boson searches at future colliders.


title: Mass spectra and leptonic decay widths of heavy quarkonia

abstract:
  A nonrelativistic Hamiltonian with plausible spin dependent corrections is
proposed for the quarkonia below their respective strong decay thresholds. With
only six free parameters this model reproduces the nine known masses of the
bottomonia within about 1 MeV, the six known masses of the charmonia within a
few MeV and the five known leptonic decay widths of the ${}^3S_1$ states within
about {20 %}. The model is then used to predict the masses of the remaining 43
quarkonia (some of them for the first time) and of the leptonic decay widths of
the two ${}^1S_0(\bar{b}c)$ states. Comparison with some other models is made.


title: Observation of Low x Phenomena in Hadronic Final States

abstract:
  The expectations for and the measurements of transverse energy flows, single
particle p_T spectra, and the rate of forward jets in deep inelastic ep events
from the H1 and ZEUS experiments at HERA are reported and discussed. It is
shown that together they offer a good chance to establish deviations from the
DGLAP paradigm. At the present level of limited statistics the measurements are
compatible with predictions using BFKL resummation and with the color dipole
model. Models based on DGLAP evolution describe the p_T spectra and forward
jets less well but are not ruled out yet.


title: Study of e+ e- --> WW --> Lepton Neutrino q qbar at 500 GeV

abstract:
  W-pair production in e+ e- annihilation at 500 GeV is studied using different
Monte Carlo generators and the proposed detector for the Linear Collider in its
TESLA version. Semileptonic W decays are used to give hints for the detector
optimization and to determine the expected accuracy of the W mass determination
and the measurement of the anomalous triple gauge boson couplings. With an
expected luminosity of 50 inverse fb a W mass measurement with an accuracy of
15 MeV should be possible. The triple gauge boson couplings can be determined
with an accuracy in the order of ten to minus three.


title:
On the determination of M_W and TGCs in W-pair production using the best
  measured kinematical variables

abstract:
  A study is made of the feasibility of maximum likelihood fits to determine
M_W and triple gauge boson couplings using only those experimental kinematical
variables that are well measured. A computational tool to calculate theoretical
probabilities for those kinematical variables is discussed and then applied to
samples of unweighted events produced by an event generator. Detailed results
on the M_W determination for semileptonic final states in W-pair production
show the feasibility of the method. For TGCs one result is presented as an
illustration.


title:
Effect of Tev scale new physics on the cross-section for the process e^+
  e^- --> h \gamma

abstract:
  Tev scale new heavy physics could significantly affect the cross-section for
the rare process $e^+e^-\to H\gm $ through non-renormalizable operators
involving the light SM fields. In this article we show that for $\sqs =500$ Gev
and $\lam =1$ Tev some of these operators, which are only weakly constrained by
the latest LEP and SLD data, could produce an observable number of events for
$m_H$ lying in the range 200-500 Gev. Whereas for $\lam =5$ Tev although no
event with $m_H\le 250$ Gev is likely to be seen, for moderately heavy higgs
bosons with $m_H$ lying in the range (400-500) Gev the production rate will be
large enough to be detectable.


title: Lambda Polarization in Lepton Induced Reactions

abstract:
  Different phenomenological approaches for Lambda and Lambda-bar polarization
in polarized semi-inclusive deep inelastic scattering and electron-positron
annihilation at Z^0 pole are considered. Current and future experiments will
soon provide accurate enough data to study spin phenomena in these reactions
and distinguish between various models.


title: Thermal Fluctuations of Domains of Disoriented Chiral Condensates

abstract:
  We argue that disoriented chiral condensate (DCC) domains are not well
defined for temperatures above the Ginzburg temperature $T_G$ ($\simeq 0.7
T_c$). Above $T_G$, the dynamics of DCC domains is dominated by thermal
fluctuations leading to fluctuating orientation of the chiral field in a given
domain. It implies that DCC domains may form even in relatively lower energy
collisions where the temperature only reaches $T_G$, and never rises to $T_c$.
It also means that detection of DCC can not be taken as a signal for an
intermediate chirally symmetric phase of matter. Using these considerations, we
estimate the probability distribution for DCC domains as a function of the
chiral angle.


title: Theoretical aspects of hadron photoproduction

abstract:
  We review recent developments in the theoretical description of inclusive
single-hadron production at next-to-leading order in the parton model of
quantum chromodynamics. Fragmentation functions are extracted from fits to data
of inclusive pion and kaon production in e^+e^- annihilation at different
centre-of-mass energies. Exploiting sensitivity to the scaling violation, one
can simultaneously fit the asymptotic scale parameter Lambda so as to obtain an
independent determination of the strong coupling constant alpha_s. Owing to the
factorization theorem, the fragmentation functions only depend on the species
of the produced particles, but not on the process by which they are produced.
This allows one to make absolute theoretical predictions for inclusive pion and
kaon production in other types of experiments such as photon-photon,
photon-hadron, or hadron-hadron scattering. Recent data of photoproduction
taken by the H1 and ZEUS Collaborations at DESY HERA nicely agree with such
next-to-leading-order predictions.


title:
Dark matter constraints in the minimal and nonminimal SUSY standard
  model

abstract:
  We determine the allowed parameter space and the particle spectra of the
minimal SUSY standard model (MSSM) and nonminimal SUSY standard model (NMSSM)
imposing correct electroweak gauge-symmetry breaking and recent experimental
constraints. The parameters of the models are evolved with the SUSY RGEs
assuming universality at the GUT scale. Applying the new unbounded from below
(UFB) constraints we can exclude the LSP singlinos and light scalar and
pseudoscalar Higgs singlets of the NMSSM. This exclusion removes the
experimental possibility to distinguish between the MSSM and NMSSM via the
recently proposed search for an additional cascade produced in the decay of the
bino into the LSP singlino. Furthermore the effects of the dark matter
condition for the MSSM and NMSSM are investigated and the differences
concerning the parameter space, the SUSY particle and Higgs sector are
discussed.


title: Testing CPT Symmetry

abstract:
  In this talk, I review the possibility that CPT and Lorentz symmetry might be
spontaneously broken in nature by effects originating in a theory beyond the
standard model, and I discuss some existing and future experimental tests.


title:
Equation of State, Radial Flow and Freeze-out in High Energy Heavy Ion
  Collisions

abstract:
  We have shown that recent experimental data on radial flow, both from AGS and
SPS energies, are in agreement with the Equation of State (EOS) including the
QCD phase transition. New hydro-kinetic model (HKM) is developed, which
incorporates hydrodynamical treatment of expansion and proper kinetics of the
freeze-out. We show that the freeze-out surfaces for different secondaries and
different collisions are very different, and they are not at all isotherms (as
was assumed in most previous hydro works). Comparison of HKM results with
cascade-based event generator RQMD is also made in some details: we found that
both EOS and flow are in rather good agreement, while the space-time picture is
still somewhat different.


title: Are $e\mu$ colliders interesting?

abstract:
  We show that current experimental constraints already severely restrict what
might be observable at $e\mu$ colliders. We identify some cases where it may be
possible to probe physics beyond what might be possible at other facilities and
make some remarks about physics capability of high energy $e\mu$ colliders.


title: Further remarks on isospin breaking in charmless semileptonic B decays

abstract:
  We consider the isospin breaking corrections to charmless semileptonic decays
of B mesons. Both, the recently measured branching ratios of exclusive decays
by the CLEO Collaboration and the end-point reion of the inclusive lepton
spectrum in form factor models, can be affected by these corrections. Isospin
corrections can affect the determination of |V_ub| from exclusive semileptonic
B decays at a level comparable to present statistical uncertainties.


title:
Nonequilibrium inflaton dynamics and reheating. II. Fermion production,
  noise, and stochasticity

abstract:
  We present a detailed and systematic analysis of the coarse-grained,
nonequilibrium dynamics of a scalar inflaton field coupled to a fermion field
in the latter stages of the reheating period of inflationary cosmology. We
derive coupled nonperturbative equations for the inflaton mean field and
variance at two loops in a general curved spacetime, and show that the
equations of motion are real and causal, and that the gap equation for the
two-point function is dissipative due to fermion particle production. We then
specialize to the case of Minkowski space and small-amplitude inflaton
oscillations, and derive the perturbative one-loop dissipation and noise
kernels to fourth order in the Yukawa coupling constant; the normal-threshold
dissipation and noise kernels are shown to satisfy a zero-temperature
fluctuation-dissipation relation. We derive a Langevin equation for the
dynamics of the inflaton zero mode, and show that its variance is
non-negligible during reheating. Stochastic evolution of the inflaton may have
important astrophysical consequences.


title:
Creation of photons and electron - positron pairs by a neutrino in a
  strong magnetic field

abstract:
  The processes of the photon and electron-positron pair production by a
neutrino propagating in a strong magnetic field are investigated in the
framework of the Standard Model. The process probabilities and the mean values
of the neutrino energy and momentum loss are calculated. Possible astrophysical
manifestations of the processes considered are briefly analysed.


title: A New Signature of Dark Matter

abstract:
  Dark matter capture and annihilation in planets and their satellites, in
addition to producing neutrinos (already the basis of several ongoing
experiments), is shown to lead to more significant heat generation in these
bodies for a uniform dark matter halo. This thermal output becomes more
prominent when clumped dark matter passes through the solar system. The dark
matter annihilations should be treated as a new source of heat in the solar
system which in some special cases may lead to unique imprints. Such new
signatures of the dark matter are found in the generation of the puzzling
magnetic field of Ganymede. This new source of heat perhaps cannot explain the
formation and segregation of Ganymedean structure (which are probably due to
conventional gravitational and radioactive heating), but provides a possible
explanation of the origin of the Ganymedean magnetic field.


title: Event Generators for WW Physics

abstract:
  The report summarizes the results of the activities of the Working Group on
Event Generators for WW Physics at CERN during 1995.


title: Neutrino masses and flavor symmetries

abstract:
  The problem of neutrino masses and mixing angles is analysed in a class of
supersymmetric grand unified models, with SO(10) gauge symmetry and global U(2)
flavour symmetry. Adopting the seesaw mechanism for the generation of the
neutrino masses, one obtains a mass matrix for the left-handed neutrinos which
is directly related to the parameters of the charged sector, while the unknown
parameters of the right-handed Majorana mass matrix are inglobed in a single
factor.


title: Resummation of perturbative QCD by Pade approximants

abstract:
  In this lecture I present some of the new developments concerning the use of
Pade Approximants (PA's) for resumming perturbative series in QCD. It is shown
that PA's tend to reduce the renormalization scale and scheme dependence as
compared to truncated series. In particular it is proven that in the limit
where the $\beta$ function is dominated by the 1-loop contribution, there is an
exact symmetry that guarantees invariance of diagonal PA's under changing the
renormalization scale. In addition it is shown that in the large $\beta_0$
approximation diagonal PA's can be interpreted as a systematic method for
approximating the flow of momentum in Feynman diagrams. This corresponds to a
new multiple scale generalization of the Brodsky-Lepage-Mackenzie (BLM) method
to higher orders. I illustrate the method with the Bjorken sum rule and the
vacuum polarization function.


title: Reheating in the Presence of Noise

abstract:
  Explosive particle production due to parametric resonance is a crucial
feature of reheating in inflationary cosmology. Coherent oscillations of the
inflaton field act as a periodically varying mass in the evolution equation for
matter fields which couple to the inflaton. This in turn results in the
parametric resonance instability. Thermal and quantum noise will lead to a
nonperiodic perturbation in the mass. We study the resulting equation for the
evolution of matter fields and demonstrate that noise (at least if it is
temporally uncorrelated) will increase the rate of particle production. We also
estimate the limits on the magnitude of the noise for which the resonant
behavior is qualitatively unchanged.


title: Double Counting Ambiguities in the Linear Sigma Model

abstract:
  We study the dynamical consequences imposed on effective chiral field
theories such as the quark-level SU(2) linear $\sigma$ model (L$\sigma$M) due
to the fundamental constraints of massless Goldstone pions, the normalization
of the pion decay constant and form factor, and the pion charge radius. We
discuss quark-level double counting L$\sigma$M ambiguities in the context of
the Salam-Weinberg $Z = 0$ compositeness condition. Then SU(3) extensions to
the kaon are briefly considered.


title:
Supersymmetric QCD Parity Nonconservation in Top Quark Pairs at the
  Tevatron

abstract:
  In the supersymmetry (SUSY) models, because of the mass difference between
the left- and right-top squarks, the supersymmetric QCD interactions can
generate parity violating effects in the production of $ t \bar t$ pairs. We
show that SUSY QCD radiative corrections to the parity violating asymmetry in
the production rates of the left- and right-handed top quarks via the $q \bar q
\ra t \bar t$ process can reach about 3% at the Fermilab Tevatron with
$\sqrt{s}=2$ TeV. This could be observable with an integrated luminosity larger
than $2 fb^{-1}$. We also show that in these models the SUSY QCD radiative
corrections to the $t \bar t$ production rate are small unless gluinos are very
light, of the order of 1 GeV.


title: Instanton Induced Phenomena in the Effective Standard Model

abstract:
  It is shown that in the Effective Standard Model new phenomena can arise due
to the presence of small instanton configurations. The chief result is that
under certain conditions new hidden coupling constants could exist in the
model. In the Electroweak sector that might result in the possibility of
observing B+L violating processes due to a highly non perturbative contribution
to the holy grail function. The same phenomenon might occur in the QCD sector
of the theory and could be observed in the DIS experiments at HERA.


title:
Six fermion processes at future $e^+ e^-$ colliders: signal and
  irreducible background for top, WWZ and Higgs physics in charged current
  final states

abstract:
  We compute several total and differential cross sections relevant to top,
  WWZ and Higgs physics at future $e^+e^-$ colliders taking into account the
full set of Feynman diagrams for six fermion final states. We examine in
particular charged current processes, in which final particles cannot be formed
by three Z's decay. We include in our calculations initial state radiation and
beamstrahlung effects, and the most important QCD corrections in an approximate
(naive) form. We also compare this complete approach with production $\times$
decay approximation.


title: An electroweak SU(2)left x U(1) gauge theory of J=0 mesons

abstract:
  I build a SU(2)left x U(1) electroweak gauge theory of J=0 mesons, which
transform like sets of fermion-antifermion composite fields. SU(2)left x U(1)
is embedded in a natural way, compatible with the Glashow-Salam-Weinberg model
for quarks, into the chiral group U(N)left x U(N)right, N being the (even)
number of ``flavours''. The Lagrangian exhibits a chiral SU(2)left x SU(2)right
symmetry at the limit when the hypercharge coupling g' goes to zero. It is
spontaneously broken down to its diagonal SU(2)v subgroup; as the latter
includes the U(1) group of electromagnetism, this provides an explanation for
the quantization of the electric charge. Comparison with recent works by Cho et
al. unraveling dyon-like solution is an electroweak model with the same
structure suggests that electric-magnetic duality may be realized here, with
the occurrence of a strongly interacting sector. Chiral are electroweak
spontaneous breaking are identical. Consequences for the nature of the
Goldstone bosons are examined. The mass spectrum is analysed. It bears no
special connection with the nature of the ``fermionic content'' of the mesons
and shares with the leptonic sector the same arbitrariness. No information on
the mass of the Higgs boson can be expected without additional input. New
results about CP violation are obtained: ``indirect'' CP violation appears to
results from P violation (unitarity compels the electroweak mass eigenstates to
be C eigenstates), and the role of the Kobayashi-Maskawa mixing matrix for
fermions fades away: mesonic mass eigenstates can still be CP eigenstates
despite the presence of a complex phase. I briefly show how the customary
results for the leptonic decays of pseudoscalar mesons are recovered. The
extension to leptons is discussed.


title:
String unification scale and the hyper-charge Kac-Moody level in the
  non-supersymmetric standard model

abstract:
  The string theory predicts the unification of the gauge couplings and
gravity. The minimal supersymmetric Standard Model, however, gives the
unification scale $\sim 2\times 10^{16}$ GeV which is significantly smaller
than the string scale $\sim 5\times 10^{17}$ GeV of the weak coupling heterotic
string theory. We study the unification scale of the non-supersymmetric minimal
Standard Model quantitatively at the two-loop level. We find that the
unification scale should be at most $\sim 4\times 10^{16}$ GeV and the desired
Kac-Moody level of the hyper-charge coupling should be $1.33 \lsim \ky \lsim
1.35$ in the absence of significant string threshold effects.


title: Exclusive Hadronic B-Decays

abstract:
  Exclusive non-leptonic two-body decays are discussed on the basis of a
generalized factorization approach which also includes non-factorizeable
contributions. Numerous decay processes can be described satisfactorily. The
success of the method makes possible the determination of decay constants from
non-leptonic decays. In particular, we obtain f_{D_s}=(234+-25) MeV and
f_{D^*_s}=(271+-33) MeV. The observed constructive and destructive interference
pattern in charged B- and D-decays, respectively, can be understood in terms of
the different alpha_s-values governing the interaction among the quarks. The
running of alpha_s is also the cause of the observed strong increase of the
amplitude of lowest isospin when going to low energy transitions.


title:
Next-to-Leading Order QCD corrections to Three-Jet Rates with Massive
  Quarks

abstract:
  The reaction $e^+e^-$ annihilation into three jets was recently computed for
massive quarks at next-to-leading order in perturbative QCD. We discuss some
results of our calculation for b jets produced at the Z resonance.


title:
Next-to-leading order QCD corrections to $e^+e^-\to 3$ jets with massive
  quarks

abstract:
  We discuss a calculation of the next-to-leading order QCD corrections to the
process $e^+e^-\to 3$ jets with massive quarks, and show numerical results for
the three jet fraction and the differential two jet rate.


title:
Report of the Working Group on `W Mass and QCD' (Phenomenology Workshop
  on LEP2 Physics, Oxford, April 1997)

abstract:
  The W Mass and QCD Working Group discussed a wide variety of topics relating
to present and future measurements of M(W) at LEP2, including QCD backgrounds
to W+W- production. Particular attention was focused on experimental issues
concerning the direct reconstruction and threshold mass measurements, and on
theoretical and experimental issues concerning the four jet final state. This
report summarises the main conclusions.


title:
Signatures of Higgs Bosons in the Top Quark Decay Channel at Hadron
  Colliders

abstract:
  We analyze some signatures of neutral Higgs bosons, produced in high energy
proton (anti)proton collisions, which decay primarily to top quarks. This
channel is clouded by a large irreducible $t\bar t$ background. We investigate
the $t\bar t$ invariant-mass distribution in the lepton+jets decay mode of
$t\bar t$ and a $t\bar t$ spin-spin correlation in the dilepton decay mode. At
the LHC such Higgs bosons can be detected in the $t\bar t$ invariant-mass
spectrum, and the spin-spin correlation studied by us is also sensitive to a
Higgs boson if this particle has a sizeable pseudoscalar component.


title: Quantum Fluctuations of Axions

abstract:
  We study the time evolution of the quantum fluctuations of the axion field
for both the QCD axion as well as axions arising in the context of supergravity
and string theories. We explicitly keep track not only of the coherently
oscillating zero momentum mode of the axion but also of the higher non-zero
momentum modes using the full axion potential. The full axion potential makes
possible two kinds of instabilities: spinodal instabilities and parametric
resonance instabilities. The presence of either of these instabilities can lead
to a quasi-exponential increase in the occupation of non-zero momentum modes
and the build-up of the quantum fluctuations of the axions. If either of these
becomes a significant effect then axions would no longer be a suitable cold
dark matter candidate. Our results confirm the conventional wisdom that these
effects are not significant in the setting of an expanding FRW universe and
hence axions are indeed cold dark matter candidates.


title:
More about Electroweak Baryogenesis in the Minimal Supersymmetric
  Standard Model

abstract:
  We compute the baryon asymmetry generated at the electroweak phase transition
by the Higgs scalar sector of the minimal supersymmetric standard model.
Because of large enhancement effects from low momentum modes, Higgs particles
may be responsible for the observed baryon asymmetry even though CP-violation
in the Higgs sector only appears at the one-loop level. We also discuss the
approximations made in the analysis and suggest possible improvements.


title: Microphysics of Gauge Vortices and Baryogenesis

abstract:
  I give a brief overview of a novel mechanism for generating the baryon
asymmetry of the universe at the electroweak scale. This scenario circumvents
the need for a strongly first order electroweak phase transition by utilizing
gauged topological solitons to realize the requisite departure from thermal
equilibrium.


title: Implications of the Fleischer-Mannel Bound

abstract:
  Fleischer and Mannel (FM) have shown that it may become possible to constrain
the angle $\gamma$ of the unitarity triangle from measurements of various
$B\to\pi K$ decays. This constraint is independent of hadronic uncertainties to
the few percent level. We show that, within the Standard Model, the FM bound
gives strong constraints on the CKM parameters. In particular, it could predict
a well defined sign for $\sin2\gamma$ and $\sin2\alpha$. In a class of
extensions of the Standard Model, where the New Physics affects only $\Delta
B=2$ (and, in particular, not $\Delta B=1$) processes, the FM bound can lead to
constraints on CP asymmetries in $B$ decays into final CP eigenstates even if
$B-\bar B$ mixing is dominated by unknown New Physics. In our analysis, we use
a new method to combine in a statistically meaningful way the various
measurements that involve CKM parameters.


title: Generation of Large Lepton Asymmetries

abstract:
  We present here a realistic model to produce a very large lepton asymmetry L
of 0.1 to 1, without producing a large baryon asymmetry. The model is based on
the Affleck and Dine scenario, in which the field acquiring a large vacuum
expectation value during inflation is a s-neutrino right. We require $L$ to be
large enough for the electroweak symmetry to be spontaneously broken at all
temperatures after inflation, with the consequent suppression of sphaleron
transitions.


title: Neutrino-photon reactions in astrophysics and cosmology

abstract:
  At energies above the threshold for $W$ production the process $\nu \gamma
\to l W^+$ is competive with $\nu \nu$ scattering at the same center of mass
energies. In a cosmological setting, absorption of ultra high energy neutrinos
by the microwave photon background is comparable to absorption by the neutrino
background. In passing through matter, the process $\nu \to l W^+$ will occur
in the coulomb field of nuclei. For iron, the interaction rate per nucleon is
roughly 20% of the charge current cross-section. The related process,
$\anti\nu_e e^- \to \gamma W^-$ dominates $\anti\nu_e e^-$ scattering for about
a decade in energy above the resonance for $W$ production.


title: CP Violation Beyond the Standard Model

abstract:
  Recent developments concerning CP violation beyond the Standard Model are
reviewed. The central target of this presentation is the $B$ system, as it
plays an outstanding role in the extraction of CKM phases. Besides a general
discussion of the appearance of new physics in the corresponding CP-violating
asymmetries through $B^0_q$--$\bar{B^0_q}$ mixing $(q\in\{d,s\})$, it is
emphasized that CP violation in non-leptonic penguin modes, e.g. in $B_d\to\phi
K_{S}$, offers a powerful tool to probe physics beyond the Standard Model. In
this respect $B\to\pi K$ modes, which have been observed recently by the CLEO
collaboration, may also turn out to be very useful. Their combined branching
ratios allow us to constrain the CKM angle $\gamma$ and may indicate the
presence of physics beyond the Standard Model.


title:
Pinning down neutralino properties from a possible modulation signal in
  WIMP direct search

abstract:
  We analyze the properties of neutralino under the hypothesis that some
preliminary experimental results of the DAMA/NaI Collaboration may be
indicative of a yearly modulation effect. We examine which supersymmetric
configurations would be singled out by the DAMA/NaI data. We also discuss the
possibility to investigate these configurations by means of experimental
searches for relic neutralinos other than direct searches. We finally discuss
the possibility to probe these configurations by accelerator searches.


title: The Proton Spin and Flavor Structure in the Chiral Quark Model

abstract:
  After a pedagogical review of the simple constituent quark model and deep
inelastic sum rules, we describe how a quark sea as produced by the emission of
internal Goldstone bosons by the valence quarks can account for the observed
features of proton spin and flavor structures. Some issues concerning the
strange quark content of the nucleon are also discussed.


title: The Free Energy in Scalar Electrodynamics at High Temperature

abstract:
  Massless scalar electrodynamics is studied at high temperature and zero
chemical potential. I derive the free energy to order $\lambda^2$, $\lambda
e^2$ and $e^4$ by effective field theory methods. The first step consists of
the construction of an effective three-dimensional field theory that is valid
on distance scales $R\gg 1/T$ and whose parameters can be written as power
series in $\lambda$ and $e^2$. These coupling constants encode the contribution
to physical quantities from the scale $T$. The second step is the use of the
effective Lagrangian and perturbative calculations yield the contributions to
the free energy from the scale $eT\sim\sqrt{\lambda}T$.


title:
Why Naive Quark Model Can Yield a Good Account of the Baryon Magnetic
  Moments

abstract:
  The chiral quark model suggests that the baryon quark-sea is negatively
polarized. This modifies the spin structure as given by the naive quark model
and agrees with experimental data. However, for the magnetic moments, there is
significant cancellation between the contritutions from this sea
spin-polarization and the orbital angular momentum so that effectively the
moments are given by the valence constituent quarks alone, as in the NQM.


title: Fixed points and vacuum energy of dynamically broken gauge theories

abstract:
  We show that if a gauge theory with dynamical symmetry breaking has
non-trivial fixed points, they will correspond to extrema of the vacuum energy.
This relationship provides a different method to determine fixed points.


title: Negative contributions to S in an effective field theory

abstract:
  We show that an effective field theory that includes non-standard couplings
between the electroweak gauge bosons and the top and bottom quarks may yield
negative contributions to both the S and T oblique radiative electroweak
parameters. We find that that such an effective field theory provides a better
fit to data than the standard model (the chi-squared per degree of freedom is
half as large). We examine in some detail an illustrative model where the
exchange of heavy scalars produces the correct type of non-standard couplings.


title:
One and two loop anomalous dimensions for the chiral-odd structure
  function h1

abstract:
  Because the chiral-odd structure function h_1 will be measured in the
polarized Drell-Yan process, it is important to predict the behavior of h_1
before the measurement. In order to study the Q^2 evolution of h_1, we discuss
one and two loop anomalous dimensions which are calculated in the Feynman gauge
and minimal subtraction scheme.


title: Finite Grand Unified Theories and Inflation

abstract:
  A class of finite GUTs in curved spacetime is considered in connection with
the cosmological inflation scenario. It is confirmed that the use of the
running scalar-gravitational coupling constant in these models helps realizing
a successful chaotic inflation. The analyses are made for some different sets
of the models.


title: Flavor Mixing, CP-Violation and the Masses ov the Light Quarks

abstract:
  The observed hierarchy of the quark masses is interpreted as a signal for an
underlying ``subnuclear democracy'' as the relevant symmetry of the quark mass
terms. A simple breaking of the symmetry leads to a mixing between the second
and the third family, in agreement with observation. Introducing the mixing
between the first and the second family, one finds an interesting pattern of
maximal CP--violation as well as a complete determination of the elements of
the CKM matrix and of the unitarity triangle.


title: Recent Developments in Theory of CP Violation

abstract:
  Four topics in theory of CP violation are reviewed. (a) CP violation in $B$
decays: We describe a new clean way of constraining the angle $\gamma$ of the
unitarity triangle and how new CP violation in decay amplitudes can signal new
physics. (b) CP violation in $K$ decays: We explain the special features of the
decay $K_L\ra\pi^0\nu\bar\nu$ both as a measurement of Standard Model CP
violating parameters and as a probe of new physics. (c) CP violation in $D$
decays: We describe the consequences of CP violation from new physics in
$D-\bar D$ mixing. (d) CP violation in Supersymmetry: We explain how a
combination of measurements of CP violating processes will give insight into
the flavor and CP structure of supersymmetry.


title: Low-Energy Pion-Nucleon Interaction and the Sigma-Term

abstract:
  A dispersion framework, appropriate for discussing the low-energy
pion-nucleon interaction, is reviewed. Sensitivity of the isoscalar D-amplitude
at the unphysical Cheng-Dashen point to input from different phase shift
analyses and low-energy experiments is discussed.


title:
A New Qualitative Prediction of the Parton Model for High Energy Hadron
  Collisions

abstract:
  Inclusive single jet production in hadron collisions is considered. It is
shown that the QCD parton model predicts a nonmonotonic dependence of the
inclusive cross section on the fraction of the energy deposited in the jet
registered, if it is normalized on the same cross section measured at another
collision energy. Specifically, if the cross section is normalized by the one
measured at a higher collision energy, it possesses a minimum which depends on
jet rapidity. This prediction can be tested at the Fermilab Tevatron, at the
CERN LHC, and at the Very Large Hadron Collider under discussion.


title: Jet Production in Regge-Limit of QCD

abstract:
  Current issues on jet production in hadron collisions for Regge-limit of QCD
are briefly discussed.


title:
Towards resolution of the scalar meson nonet enigma II.Gell-Mann-Okubo
  revisited

abstract:
  We rederive the new SU(3) multiplet mass formula
2M^2(s\bar{s})+3M^2(n\bar{n}, I=1)=4M^2(s\bar{n})+M^2(n\bar{n},I=0) (n=u,d},
obtained in our previous paper by using Regge phenomenology, for the
pseudoscalar and scalar mesons in the Nambu-Jona-Lasinio model with
instanton-induced interaction. We apply this formula to the problem of the
correct q\bar{q} assignment for the scalar meson nonet. Our results strongly
favor the masses of the scalar isoscalar mostly octet and mostly singlet states
in the vicinity of 1.45 GeV and 1.1 GeV, respectively


title:
New Mechanisms of Dynamical Supersymmetry Breaking and Direct Gauge
  Mediation

abstract:
  We construct supersymmetric gauge theories with new mechanisms of dynamical
supersymmetry breaking. The models have flat directions at the classical level,
and different mechanisms lift these flat directions in different regions of the
classical moduli space. In one branch of the moduli space, supersymmetry is
broken by confinement in a novel manner. The models contain only dimensionless
couplings and have large groups of unbroken global symmetries, making them
potentially interesting for model-building. As an illustrative application, we
couple the standard model gauge group to a model with an SU(5) global symmetry,
resulting in a model with composite messengers and a non-minimal spectrum of
superpartner masses.


title: Nucleon Strange Magnetic Moment and Relativistic Covariance

abstract:
  We calculate the corrections to the strange matrix elements of the nucleon
resulting from the breaking of rotational invariance on the light-cone. In the
meson cloud model, the strange magnetic moment mu_S is seen to change sign once
the spurious form factors arising from this violation are subtracted. The
resulting mu_S is small and slightly positive, in agreement with the trend of
the recent data from the SAMPLE experiment. The value of the strange magnetic
form factor is predicted to be largely Q^2 independent over the range
accessible in upcoming experiments.


title: Neutral Pion Electroproduction on the Proton near Threshold

abstract:
  The neutral pion electroproduction on the proton is considered in the
framework phenomenological model based on the PCAC, current algebra with hard
pions and chiral symmetry breaking interaction. The s- wave differential
cross-section of the electroproduction of neutral pions off protons near the
threshold is predicted as function photon momentum transfer squared $k^2$ . The
s- wave multipoles $ReE_{0+}$ and $ReL_{0+}$ as function of the energy of the
$\pi^0p$- system are given for the small $k^2$ and $% k^2=0.1(GeV/c)^2$. The
results are compered with the experiment. It is shown the significant role of
the explicit chiral symmetry breaking.


title: Non-decoupling effects due to a dimensionful coupling

abstract:
  We show that the dimensionful scalar cubic coupling in 3+1 dimensions gives
rise to non-decoupling effects and analyze the behavior of these effects. In
the process, we clarify how it is perturbatively consistent to construct
theories in which the cubic coupling is dominant. We use the scalar sector of
the Supersymmetric Standard Model as an example. We discuss how the
non-decoupling effects may be analyzed systematically.


title: Light and Strange Quark Masses with Dynamical Wilson Fermions

abstract:
  We determine the masses of the light and the strange quarks in the
MS-bar-scheme using our high-statistics lattice simulation of QCD with
dynamical Wilson fermions. For each of our three sea quarks we have analyzed
our data at five different values of the valence quark mass, enabling us to
parameterize our fit results in the (sea-quark mass, valence quark mass) plane.
For the light quark mass we find m_light(2 GeV) = 2.7(2) MeV, which is lower
than in quenched simulations. Applying a new method, which we propose to
extract the strange quark mass in a sea of two dynamical light quarks, we
obtain m_strange(2 GeV) = 140(20) MeV.


title: Narrow width of a glueball decay into two mesons

abstract:
  The widths of a glueball decay to two pions or kaons are analyzed in the pQCD
framework. Our results show that the glueball ground state has small branching
ratio for two-meson decay mode, which is around $10^{-2}$. The predicted values
are consistent with the data of $\xi\to\pi\pi, KK$ if $\xi$ particle is a
$2^{++}$ glueball. Applicability of pQCD to the glueball decay and comparison
with $\chi_{cJ}$ decay are also discussed.


title:
One particle cross section in the target fragmentation region: an
  explicit calculation in (\phi^3)_6

abstract:
  One particle inclusive cross sections in the target fragmentation region are
considered and an explicit calculation is performed in (\phi^3)_6 model field
theory. The collinear divergences can be correctly absorbed into a parton
density and a fragmentation function but the renormalized cross section gets a
large logarithmic correction as expected in a two scale regime. We find that
the coefficient of such a correction is precisely the scalar DGLAP kernel.
Furthermore the consistency of this result with an extended factorization
hypothesis is investigated.


title: The running of the b-quark mass from LEP data

abstract:
  Next-to-leading order QCD corrections to three jet heavy quark production in
$e^+ e^-$ collisions, including quark mass effects, are presented. The
extraction of the b-quark mass form LEP data is considered and the first
experimental evidence for the running of a quark mass is discussed.


title: Radiative and rare kaon decays : an update

abstract:
  We review some new developments in the theoretical description of the
processes K ->pi gamma gamma, K_L ->gamma l^+ l^-, K_L ->pi^0 e^+ e^- and K_L
->mu^+ mu^-.


title:
Leptoquark Pair Production at e+e- Linear Colliders: Signals and
  Background

abstract:
  We study pair production of leptoquarks in e+e- annihilation at linear
colliders. A detailed simulation including beamstrahlung and initial state
radiation, leptoquark decay and hadronization, as well as detector smearing, is
performed. Discovery limits are estimated for center-of-mass energies of 500
and 800 GeV. The prospects for determining masses and couplings of leptoquarks
are also investigated.


title: Anomalous W^+ W^- t {\bar t} Couplings at the e^+ e^- Linear Collider

abstract:
  We study production of t {\bar t} via W^+ W^- fusion, including the relevant
backgrounds at the proposed Linear Collider (an e^+ e^- collider with \sqrt{S}
= 1.5 TeV) in the context of a Higssless Standard Model (SM), i.e. a nonlinear
SU(2)_L \times U(1)_Y chiral Lagrangian, including dimension five W^+ W^- t
{\bar t} interactions. Deviation from the SM total cross section can be used to
constrain the coefficients of these operators to an order of 2 \times 10^{-1}
(divided by the cut-off scale \Lambda = 3.1 TeV) with a 95% C.L.. However,
there are three ways in which this sensitivity can be improved by a factor of
two. First, by studying the deviation of the t {\bar t} kinematics from what is
predicted by the SM; second, by polarizing the collider electron beam; and
third, by studying the polarization of the produced top quarks. In this way, we
show that it is also possible to attempt to dis-entangle the contributions from
different anomalous operators, isolating the form of new physics contributions.


title: Relaxing the Geodesic Rule in Defect Formation Algorithms

abstract:
  In studying the formation of topological defects, it is conventional to
assume the ``geodesic rule'' which is equivalent to minimizing gradients of the
order parameter. This assumption has been called into question in
field-theoretic studies of first order phase transitions and in the case of
local defects. We present a scheme for numerically investigating the formation
of strings without assuming the geodesic rule. Our results show that the
fraction of string in infinite strings grows as we deviate from the geodesic
rule.


title:
Sphenomenology --- An Overview, with a Focus on a Higgsino LSP World,
  and on Eventual Tests of String Theory

abstract:
  In this talk, as requested, I begin with a overview and with some basic
reminders about how evidence for supersymmetry in nature might appear -- in
particular, how SUSY signatures are never clear so it is difficult to search
for them without major theoretical input. Models can be usefully categorized
phenomenologically by naming their LSP -- that is, once the LSP is
approximately fixed so is the behavior of the observables, and the resulting
behavior is generally very different for different LSPs. Next I compare the
three main LSP-models (gravitino, bino, higgsino). Hints from data suggest
taking the higgsino-LSP world very seriously, so I focus on it, and describe
its successful prediction of reported events from the 1996 LEP runs. SUSY
signatures in the $\tilde h$ LSP world are very different from those that are
usually studied. Then I briefly discuss how to measure the parameters of the
effective Lagrangian from collider and decay data. Finally I turn to how data
will test and help extract the implications of string theories.


title: Signal and Backgrounds for Leptoquarks at the LHC

abstract:
  We study the potentiality of the CERN Large Hadron Collider (LHC) to unravel
the existence of first generation scalar leptoquarks.
  Working with the most general $SU(2)_L \otimes U(1)_Y$ invariant leptoquark
interactions, we analyze in detail the signals and backgrounds that lead to a
final state containing a pair $e^+e^-$ and jets. Our results indicate that a
machine like the LHC will be able to discover leptoquarks with masses up to
2--3 TeV depending on their couplings.


title:
Turning Around the Sphaleron Bound: Electroweak Baryogenesis in an
  Alternative Post-inflationary Cosmology

abstract:
  The usual sphaleron bound and the statement of the impossibility of baryon
production at a second order phase transition or analytic cross-over are
reformulated in the first part of the paper as requirements of the expansion
rate of the Universe at the electroweak scale. With an (exact or effective)
additional contribution to the energy density scaling as 1/a^6, which dominates
until just before nucleosynthesis, the observed baryon asymmetry may be
produced at the electroweak scale in simple extensions of the Minimal Standard
Model, even in the case that the phase transition is not first order. We focus
our attention on one such cosmology, in which the Universe goes through a
period termed `kination' in which its energy is dominated by the kinetic energy
of a scalar field. The required kinetic energy dominated modes can occur either
as a field rolls down an exponential (or steeper) potential, or in the
oscillation of a field about the minimum of a steep power-law potential. We
implement in detail the former case with a single exponential field first
driving inflation, and then rolling into a kinetic energy dominated mode.
Reheating is achieved using an alternative to the usual mechanism due to
Spokoiny, in which the Universe is `reheated' by particle creation in the
expanding background. Density perturbations of the magnitude required for
structure formation may also be generated. We show that the analogous model for
the power-law potential cannot be consistently implemented. In models with
inflation driven by a second field and the usual mechanism of reheating (by
decay of the inflaton) the required kinetic energy dominated cosmology is
viable in both types of potential.


title: Electroweak Baryogenesis without the Phase Transition

abstract:
  Radiation domination at the electroweak epoch is a simplifying assumption,
but one for which there is no observational basis. Treating the expansion rate
as a variable, I re-examine electroweak baryogenesis in various scenarios. At a
first order phase transition the main effect is on the sphaleron bound, which
becomes a lower bound on the expansion rate in any given theory. At a
second-order or cross-over phase transition, the created baryon asymmetry is
directly proportional to the expansion rate. I sketch an alternative
post-inflationary cosmology, in which the kinetic energy of a scalar field
dominates the Universe until shortly before nucleosynthesis, and argue that the
observed baryon asymmetry could be produced in this case even at an analytic
cross-over.


title: Interference Fragmentation Functions and the Nucleon's Transversity

abstract:
  We introduce twist-two quark interference fragmentation functions in helicity
density matrix formalism and study their physical implications. We show how the
nucleon's transversity distribution can be probed through the final state
interaction between two mesons ($\pi^+\pi^-$, $K\bar K$, or $\pi K$) produced
in the current fragmentation region in deep inelastic scattering on a
transversely polarized nucleon.


title:
Effective Potential at Finite Temperature: RG improvement vs. High
  temperature expansion

abstract:
  We have applied the recently proposed renormalization group improvement
procedure of the finite temperature effective potential, and have investigated
extensively the phase structure of the massive scalar $\phi^4$ model, showing
that the $\phi^4$ model has a rich 3-phase structure at $T \neq 0$, two of them
are not seen in the ordinary perturbative analysis. Temperature dependent phase
transition in this model is shown to be strongly the first order.


title:
Technicolor leptoquarks and the excess of NC and CC events with
  high-$Q^2$ at HERA

abstract:
  In this paper we pursue a consistent leptoquark interpretation for HERA
anomalies in the framework of Technicolor. We find that: (a) one F=0 scalar
Technicolor leptoquark $P_3^{'}$ with a mass of 200 GeV can provide the
required contributions to account for the excess of both neutral and charged
current events with high-$Q^2$ at HERA; (b) the current data still allow the
coexistence of $ P_3^{'}$ with m(P_3^{'})= 200 GeV$ and $P_3^0$ with
$m(P_3^0)=225 GeV$, they could contribute effectively to $e^+p$ collision
process and may be responsible for the apparent splitting of average mass of H1
and ZEUS NC events with high-$Q^2$.


title:
Exclusive nonleptonic bottom to charm baryon decays including
  nonfactorizable contributions

abstract:
  Exclusive nonleptonic decays of bottom baryons to charm baryons and
pseudoscalar light mesons are analyzed within a relativistic three-quark model.
We include factorizing as well as nonfactorizing contributions to the decay
amplitudes. The total contribution of the nonfactorizing diagrams amount up to
30% of the factorizing contributions in amplitude. We present detailed
predictions for rates and asymmetry parameters.


title: Asymptotic multiplicity scaling: a renormalization group perspective

abstract:
  A generalization of the Polyakov-Koba-Nielsen-Olesen scaling law of the
multiplicity distributions P(n,s) is developed. It states that a suitable
change in the normalization point of P(n,s) compensated by a rescaling can
restore data collapsing onto a universal curve if the original scaling rule is
violated. We show that the iteratively executed transformation of P(n,s) can be
viewed as varying the collision energy. The e+e- and p-pbar multiplicity data
at top energies are found to exhibit a fixed point property of the iteration.


title: Theoretical Analysis of B -> D^{**} pi Decays

abstract:
  The decays B -> D^{**} pi, where D^{**} is a narrow p-wave charm resonance,
are investigated in the context of a generalized factorization hypothesis,
including the leading nonfactorizable corrections. The decay rates for these
processes are related to the corresponding semileptonic rates at maximum
recoil. It is pointed out that the current data on the branching ratio for the
decay B^- -> D_2^{*0} pi^- may pose a problem for theory. We predict that
future, more accurate measurements of this branching ratio will find a value
B(B^- -> D_2^{*0} pi^-) = 4 * 10^{-4}, a factor 5 lower than the current
central value.


title: B Mixing on the Lattice: $f_B$, $f_{B_s}$ and Related Quantities

abstract:
  The MILC collaboration computation of heavy-light decay constants is
described. Results for $f_B$, $f_{B_s}$, $f_D$, $f_{D_s}$ and their ratios are
presented. These results are still preliminary, but the analysis is close to
being completed. Sources of systematic error, both within the quenched
approximation and from quenching itself, are estimated, although the latter
estimate is rather crude. A sample of our results is: $f_B=153 \pm 10
{}^{+36}_{-13} {}^{+13}_{-0} MeV$, $f_{B_s}/f_B = 1.10 \pm 0.02
{}^{+0.05}_{-0.03} {}^{+0.03}_{-0.02}$, and $f_{B}/f_{D_s} = 0.76 \pm 0.03
{}^{+0.07}_{-0.04} {}^{+0.02}_{-0.01}$, where the errors are statistical,
systematic (within the quenched approximation), and systematic (of quenching),
respectively. The largest source of error comes from the extrapolation to the
continuum. The second largest source is the chiral extrapolation. At present,
the central values are based on linear chiral extrapolations; a shift to
quadratic extrapolations would for example raise $f_B$ by $\approx 20$ MeV and
thereby make the error within the quenched approximation more symmetric.


title: Charge and Color Breaking in Supersymmetry and Superstrings

abstract:
  Charge and color breaking minima in SUSY theories might make the standard
vacuum unstable. In this talk a brief review of this issue is performed. When a
complete analysis of all the potentially dangerous directions in the field
space of the theory is carried out, imposing that the standard vacuum should be
the global minimum, the corresponding constraints turn out to be very strong
and, in fact, there are extensive regions in the parameter space of soft
SUSY--breaking terms that become forbidden. For instance, in the context of the
MSSM with universal soft terms, this produces important bounds, not only on the
value of A, but also on the values of B, M and m. In specific SUSY scenarios,
as fixed point models, no-scale supergravity, gauge-mediated SUSY breaking and
superstrings, the charge and color breaking constraints are also very
important. For example, if the dilaton is the source of SUSY breaking in
four-dimensional superstrings, the whole parameter space (m_{3/2},B) is
excluded on these grounds. Cosmological analyses are also briefly reviewed.


title: The $b\to s\gamma\gamma$ transition in softly broken supersymmetry

abstract:
  We study the effect of supersymmetric contributions to the effective quark
transition $b\to s\gamma\gamma$, including leading order QCD effects. We apply
the discussion to the decay $B_s\to\gamma\gamma$. Even though one-particle
irreducible contributions could play a role, numerical cancelations make the
amplitude for the two-photon emission strongly correlated to the $b\to s\gamma$
amplitude which is sharply constrained by experiment. A quite general statement
follows: as long as non-standard physics effects appear only in the matching of
the Wilson coefficients of the standard effective operator basis, the
deviations from the standard model expectations of the decay rates induced by
$b\to s\gamma\gamma$ are bound to follow closely the corresponding deviations
on $b\to s\gamma$. Effects of new physics are therefore bound to be small.


title: On Effective Field Theories at Finite Temperature

abstract:
  Chapter one is devoted to a study of fermions and bosons in two spatial
dimensions in external electromagnetic fields. The effectve action is
calculated by integrating out the matter fields. In chapter two, I investigate
the resummation program of Braaten and Pisarski. I calculate the screening mass
squared and the free energy in Yukwava theory to two and three-loop order,
respectively, in resummed perturbation theory. The main part of the present
work is on effective field theories at finite temperature. I discuss the
concepts of dimensional reduction, modern renormalization theory, and
renormalizable field theories (``fundamental theories'') versus
non-renormalizable theories (``effective theories''). Two methods for
constructing effective three dimensional field theories are discussed. The
first is based on the effective potential, and is applied to field theory with
$N$ charged U(N) symmetric scalar coupled to an Abelian gauge field. The second
method is an effective field theory approach based on diagrammatical methods,
recently developed by Braaten and Nieto. I apply the methods to various
problems in spinor and scalar QED.


title: Masses of W and Z bosons without Higgs

abstract:
  A Lagrangian of electroweak interactions without Higgs is used to study the
contributions of quarks and leptons to the masses of the W and the Z bosons. It
is shown that the $SU(2)\times U(1)$ symmetry is broken by both fermion masses
and axial-vector components of the intermediate bosons. The masses of the W and
the Z bosons are obtained to be (m^{2}_{W}={1\over2}g^{2}m^{2}_{t}) and
(m^{2}_{Z}=\rho m^{2}_{W}/cos^{2}\theta_{W}) with (\rho\simeq 1). Two fixed
gauge fixing terms for W and Z boson fields are derived respectively. A
coupling between photon and Z boson is predicted. Massive neutrinos are
required.


title: An Illustrative Example of How Quark-Hadron Duality Might Work

abstract:
  We discuss the issue of the local quark-hadron duality at high energies in
two- and four-dimensional QCD. A mechanism of the dynamical realization of the
quark-hadron duality in two- dimensional QCD in the limit of large number of
colors, N_c -> \infty, (the 't Hooft model) is considered. A similar mechanism
of dynamical smearing may be relevant in four-dimensional QCD. Although
particular details of our results are model-dependent, the general features of
the duality implementation conjectured previously get further support.


title: Neutrino Trapping and Neutrino Mass Bounds

abstract:
  It has been shown recently that the exchange of virtual neutrino pairs leads
to an unphysically large energy-density in neutron stars and white dwarfs,
unless neutrinos have a minimum mass, m > 0.4 eV. Here we consider the
possibility that the presence of trapped low-energy neutrinos can suppress the
exchange of virtual neutrino pairs, thereby avoiding a large energy-density
even for massless neutrinos. We show that a) there can be subvolumes in a
neutron star or white dwarf where neutrino-trapping does not take place, and
which can thus have an unphysically large energy density, and b) even in those
volumes where trapping does occur, the resulting suppression can be too small
to alter the conclusion that neutrinos must have a minimum mass.


title: Supersymmetry at LHC and NLC

abstract:
  This talk discusses the prospects for supersymmetry studies at the LHC and
NLC. The results are based on those of the Supersymmetry Working Group at the
1996 Snowmass Workshop.


title: Proof of Factorization for Exclusive Deep-Inelastic Processes

abstract:
  This talk summarized the proof of hard-scattering factorization for exclusive
deep-inelastic processes, such as diffractive meson production.


title:
Primordial Abundances of ^6Li, ^9Be, and ^11B with Neutrino Degeneracy
  and Gravitational Constant Variation

abstract:
  Recent measurements of deuterium abundances from QSO absorption spectra show
two conflicting numbers, which differ by an order of magnitude. Allowing the
neutrino degeneracy together with gravitational constant variation at the epoch
of primordial nucleosynthesis, the implication of these observations on the
^6Li, ^9Be and ^11B abundances will be discussed. Within the permitted ranges
consistent with D, ^4He and ^7Li, we observe the strong \eta dependence of ^11B
as in SBBN but no significant dependence of ^6Li and ^9Be on the baryon number
density is observed. The predictions of ^6Li and ^9Be for low and high
deuterium differ by an order of magnitude and predictions for ^11B differ by
several orders of magnitude at most and vary with \eta.


title: Thermodynamics of Strong Interactions

abstract:
  The state of art in studying thermodynamic properties of hot and dense
nuclear matter is reviewed with the special emphasis on the
confinement-deconfinement transition between hadron matter and quark-gluon
plasma. The most popular models used for describing deconfinement are analysed,
including statistical bootstrap models, pure phase models, the model of
clustered quarks, and the string-flip potential model. Predictions of these
models are compared with the lattice numerical simulations. It is concluded
that precursor fluctuation effects must be taken into account in order to get a
realistic description of deconfinement transition. Deconfinement cannot be
considered as a transition between pure hadron and quark-gluon phases.
Quark-gluon plasma and hadron clusters are different quantum states of the same
system, so that any statistical model pretending to treat nuclear matter under
extreme conditions must incorporate the probability of these different
channels.


title:
Magnetic Catalysis of Chiral Symmetry Breaking in QED at Finite
  Temperature

abstract:
  The catalysis of chiral symmetry breaking by a magnetic field in the massless
weak-coupling phase of QED is studied. The dynamical mass of a fermion (energy
gap in the fermion spectrum) is shown to depend essentially nonanalytically on
the renormalized coupling constant $\alpha$ in a strong magnetic field. The
temperature of the symmetry restoration is calculated analytically as
$T_c\approx m_{dyn}$, where $m_{dyn}$ is the dynamical mass of a fermion at
zero temperature.


title: Chiral Symmetry Breaking in the weakly coupled QED in a Magnetic Field

abstract:
  The catalysis of chiral symmetry breaking in the massless weakly coupled QED
in a magnetic field is studied. It is shown that the effect is due to the
dimensional reduction $D\to D-2$ in the dynamics of fermion pairing in a
magnetic field. The dynamical mass of fermions (energy gap in the fermion
spectrum) is determined. The temperature of the symmetry restoration is
estimated analytically.


title: Photon polarisation in diffractive deep inelastic scattering

abstract:
  The distribution of a suitably defined azimuthal angle in diffractive deep
inelastic scattering contains information on the polarisation of the exchanged
photon. In particular it allows one to constrain the longitudinal diffractive
structure function. We investigate the potential of such bounds in general and
for particular diffractive final states.


title: Investigations of Azimuthal Asymmetry in Semi-Inclusive Leptoproduction

abstract:
  We consider the azimuthal asymmetries in semi-inclusive deep inelastic
leptoproduction arising due to both perturbative and nonperturbative effects at
HERMES energies and show that the $k_T^2/Q^2$ order corrections to $< \cos\phi
>$ and $< \cos2\phi >$ are significant. We also reconsider the results of
perturbative effects for $< \cos\phi >$ at large momentum transfers \cite{A1}
using the more recent sets of scale-dependent distribution and fragmentation
functions, which bring up to $18{%}$ difference in $< \cos\phi >$. In the same
approach we calculate the $< \cos2\phi >$ as well.


title: Dilepton Emission from Dense Hadron Gas

abstract:
  Using a Hagedorn resonance gas picture and quark-hadron duality we estimate
the dilepton emission rate in the vicinity of the QCD deconfinement phase
transition. The result is then used to calculate a dilepton spectrum in
ultrarelativistic heavy ion collisions. We show that multibody contributions
taken into account in the Hagedorn resonance gas approach provide an
enhancement of the production rate of massive dileptons as compared to the
previously considered sources.


title: The Confinement

abstract:
  Numerous aspects and mechanisms of color confinement in QCD are surveyed.
After a gauge-invariant definition of order parameters, the phenomenon is
formulated in the language of field correlators, to select a particular
correlator responsible for confinement. In terms of effective Lagrangians
confinement is viewed upon as a dual Meissner effect and a quantitative
correspondence is established via the popular abelian projection method, which
is explained in detail. To determine the field configurations possibly
responsible for confinement, the search is made among the classical solutions,
and selection criterium is introduced.


title: The Parton Structure of Real Photons

abstract:
  The QCD treatment of the photon structure is recalled. Emphasis is given to
the recently derived momentum sum rule, and to the proper choice of the
factorization scheme and/or boundary conditions for the evolution equations
beyond the leading order. Parametrizations of the photon's parton content are
examined and compared. The small-x behaviour of the photon structure is briefly
discussed.


title: Structure of the constituent quark and quark distributions of hadrons

abstract:
  We study the structure of constituent quarks by dressing bare quarks with the
Goldstone bosons and its implications for quark distribution functions of
hadrons $f_1(x)$, $g_1(x)$ and $h_1(x)$. In particular we discuss effects of
the dressing on the nucleon spin structure, and find that contributions to
chiral-odd $h_1(x)$ is quite different from those to $g_1 (x)$, which can be
measured in the semi-inclusive polarized deep inelastic scattering.


title:
Soft Binary Processes, NJL Model and Absolute Values of the Amplitudes
  of Reactions pi- p --> pi0 n and pi- p --> eta n

abstract:
  In the model the entire high-energy part of the amplitude (Regge power
dependence from the total energy) comes as consequence of Gribov's diffusion of
the constituent quarks in the space of rapidities and impact parameters. Charge
exchange of the quarks, which goes at small quark anti-quark invariant masses,
is described by low-energy Nambu - Jona-Lasinio model. It is shown that spin
structure of the amplitudes and dominating spin-orbit (spin-flip) amplitudes
are well described by this model without free parameters.


title: Virtual Photons in Low Energy pi-pi Scattering

abstract:
  The low energy scattering of pions is investigated in the presence of
electromagnetic interactions at leading order and at next-to-leading order for
the amplitudes involving at most one pair of charged pions. The size of the
electromagnetic corrections to the S-wave scattering lengths is found to be
comparable to the size of the two loop strong interaction corrections.


title:
The Chiral-Odd Distribution Function $h_1$: IR-Renormalon Contribution
  and $\alpha_s$-Correction

abstract:
  The chiral-odd distribution function $h_1$ is discussed in the framework of
the renormalon approach. Using a bag-model calculation for $h_1$, we calculate
its intrinsic uncertainty due to renormalon poles. The result is given as a
function of Bjorken-$x$ as well as for the first moments separately. We also
extract the perturbative corrections to the first moments of $h_1$.


title: Test of Special Relativity from K Physics

abstract:
  A breakdown of the Local Lorentz Invariance and hence the special theory of
relativity in the Kaon system can, in principle, induce oscillations between
the $K^0$ and $\bar{K}^0$ states. We construct a general formulation in which
simultaneous pairwise diagonalization of mass, momentum and weak eigenstates is
not assumed and the maximum attainable speeds of the momentum eigenstates are
different. This mechanism permits Local Lorentz Invariance violation in a
manner that may or may not violate CPT. In the $CPT-$conserving case, we show
that violation of special relativity could be clearly tested experimentally via
the energy dependence of the $K_L-K_S$ mass difference and we discuss
constraints imposed by present experiments. In the CPT-violating case the
$K^0$--$\bar{K}^0$ system also allows the possiblity of testing different
Lorentz properties of matter and antimatter.


title: $Z\gamma H$ Vertex Effects at Future Colliders

abstract:
  We show that the Higgs production in $e\gamma$ collisions, through the
one-loop reaction $e\gamma\to eH$ at large transverse momentum, can provide a
precise determination of the $Z\gamma H$ vertex. We concentrate on the analysis
of signal rates vs background looking for strategies to improve the ratio
$S/B$. Possible bounds on anomalous contributions to the $Z\gamma H$ vertex are
derived.


title:
Lepton pair production by a high energy photon in a strong
  electromagnetic field

abstract:
  Using impact-factor representation, we consider the lepton pair production by
an incident high-energy photon in a strong electromagnetic field of a nucleus.
By summing leading terms of perturbation series, we obtain a simple formula for
the amplitude, valid to all orders in ${\cal O}(\alpha Z)$ and arbitrary field
of the nucleus. Using these results, we derive, in a simple manner, the results
for the lepton pair production by a virtual incident photon in a Coulomb field.
For real incident photon our results coincide with the known ones. Also, a
particular example of a non-Coulomb potential is discussed in some detail.


title:
Octet Baryon Magnetic Moments in the Chiral Quark Model with
  Configuration Mixing

abstract:
  The Coleman-Glashow sum-rule for magnetic moments is always fulfilled in the
chiral quark model, independently of SU(3) symmetry breaking. This is due to
the structure of the wave functions, coming from the non-relativistic quark
model. Experimentally, the Coleman-Glashow sum-rule is violated by about ten
standard deviations. To overcome this problem, two models of wave functions
with configuration mixing are studied. One of these models violates the
Coleman-Glashow sum-rule to the right degree and also reproduces the octet
baryon magnetic moments rather accurately.


title: Pion--Nucleon Scattering in a New Approach to Chiral Perturbation Theory

abstract:
  We study pion--nucleon scattering with a chiral lagrangian of pions,
nucleons, and $\Delta$-isobars. The scattering amplitude is evaluated to
one-loop $Q^3$ order, where $Q$ is a generic small momentum, using a new
approach which is equivalent to heavy baryon chiral perturbation theory. We
obtain a good fit to the experimental phase shifts for pion center-of-mass
kinetic energies up to 100 MeV. A sigma term greater than 45 MeV is favored,
but the value is not well determined.


title: Top Quark Physics for Beautiful and Charming Physicists

abstract:
  I discuss two aspects of top-quark physics: V_tb and the top-quark mass. The
similarities and differences with bottom and charm physics are emphasized.


title: A Supersymmetry Primer

abstract:
  I provide a pedagogical introduction to supersymmetry. The level of
discussion is aimed at readers who are familiar with the Standard Model and
quantum field theory, but who have had little or no prior exposure to
supersymmetry. Topics covered include: motivations for supersymmetry, the
construction of supersymmetric Lagrangians, superspace and superfields, soft
supersymmetry-breaking interactions, the Minimal Supersymmetric Standard Model
(MSSM), R-parity and its consequences, the origins of supersymmetry breaking,
the mass spectrum of the MSSM, decays of supersymmetric particles, experimental
signals for supersymmetry, and some extensions of the minimal framework.


title:
Radiations from Axion Miniclusters and Axion Boson Stars in Galactic
  Magnetic Fields

abstract:
  The paper has been withdrawm. A completely new version on oscillating axionic
boson stars will appear.


title: On the Fragmentation Function for Heavy Quarks in e+e- collisions

abstract:
  We use a recent O(alpha_s^2) calculation of the differential cross section
for the production of heavy quarks in e+e- annihilation to compute a few
moments of the heavy quark single-inclusive production cross section. We verify
that, contrary to some recent claims, the leading and next-to-leading
logarithmic terms in this cross section are correctly given by the standard NLO
fragmentation function formalism for heavy quark production.


title: Spin Effects In Diffractive High-Energy Reactions

abstract:
  Spin effects in diffractive $pp$ and $lp$ reactions are analyzed. It is shown
that the structure of the pomeron coupling can be studied in future polarized
experiments.


title:
Next-to-Leading-Order Corrections to the Production of Heavy-Flavour
  Jets in e+e- Collisions

abstract:
  In this paper we describe the calculation of the process e+e- -> Z/gamma ->
QQbar + X, where Q is a heavy quark, at order alpha_s^2.


title:
Loop Effects of Exotic Leptons on Vector-Boson Pair Production at e^+e^-
  Colliders

abstract:
  We study quantum effects of exotic heavy leptons on the production of two
vector bosons in e^+e^- annihilation. We present closed analytic expressions
for vector-boson self-couplings and differential cross sections, within the
framework of two favourable new-physics scenarios: (i) the fourth-generation
Majorana-neutrino model and (ii) an E_6-inspired model with sequential mirror
isodoublets. We constrain these models by requiring that their contributions to
the oblique electroweak parameters be compatible with a recent global fit to
high-precision data. We then systematically analyze the loop-induced deviations
in the LEP2 cross section of e^+e^- -> W^+W^- predicted by the models thus
confined.


title: Neutrino electron scattering and left-right symmetry: future tests

abstract:
  Low-energy high-resolution neutrino-electron scattering experiments may play
an important role in testing the gauge structure of the electroweak
interaction. We propose the use of radioactive neutrino sources (e.g.
$^{51}$Cr) in underground experiments such as BOREXINO and HELLAZ as a probe of
the weak neutral current structure. As an illustration, we display the
sensitivity of these detectors in testing the possible existence of
right-handed weak neutral currents.


title:
Unified description of the non-singlet spin dependent structure function
  $g_1$ incorporating Altarelli-Parisi evolution and the double logarithmic
  $ln^2(1/x)$ effects at low $x$

abstract:
  A unified equation for the non-singlet spin dependent structure function
$g_1^{ns}(x,Q^2)$ which incorporates the complete leading order
Altarelli-Parisi evolution at finite $x$ and double logarithmic $ ln^2(1/x)$
effects at $x \to 0$ is formulated. The solution of this equation reasonably
agrees with the recent data obtained by the Spin Muon Collaboration.


title: The Gaugino \beta-Function

abstract:
  We present an elegant exact formula for the gaugino $\beta$-function in a
softly-broken supersymmetric gauge theory, of the form $\beta_M = {\cal
O}(\beta_g/g)$, where $\beta_g$ is the gauge $\beta$ function and ${\cal O}$ is
a simple differential operator acting on the gauge coupling $g$ and the Yukawa
coupling.


title: Neutrinos Properties Beyond the Standard Model

abstract:
  The present observational status of neutrino physics is sketched, with
emphasis on the hints that follow from solar and atmospheric neutrino
observations, as well as dark matter. I also briefly review the ways to account
for the observed anomalies and some of their implications


title: Sparticle Production in Electron-Photon Collisions

abstract:
  We explore the potential of electron-photon colliders to measure fundamental
supersymmetry parameters via the processes $e\gamma \to \tilde e \tilde\chi^0$
(selectron-neutralino) and $e\gamma\to \tilde\nu \tilde\chi^-$
(sneutrino-chargino). Given the $\tilde\chi^0$ and $\tilde\chi^-$ masses from
$e^+e^-$ and hadron collider studies, cross section ratios
$\sigma(\gamma_-)/\sigma(\gamma_+)$ for opposite photon helicities determine
the $\tilde\nu_L$, $\tilde e_L$ and $\tilde e_R$ masses, independent of the
sparticle branching fractions. The difference $m_{\tilde\nu_L}^2-m_{\tilde
e_L}^2$ measures $M_W^2\cos2\beta$ in a model-independent way. The $\tilde e_L$
and $\tilde e_R$ masses test the universality of soft supersymmetry breaking
scalar masses. The cross section normalizations provide information about the
gaugino mixing parameters.


title:
Reconstruction of quark mass matrices in the NNI form from the
  experimental data

abstract:
  We examined the question that what is a general form of quark mass matrices
which is achieved by the transformation that leaves the left-handed gauge
interaction invariant. In particular, we analyzed in detail the Fritzsch-type
and the Branco-Silva-Marcos-type parametrization. Both parametrizations contain
ten parameters and can be expressed by the experimental data. We explicitly
reconstructed quark mass matrices in terms of quark masses and CKM parameters
for the Fritzsch-type parametrization.


title: SU(5)+Adjoint Higgs at Finite Temperature

abstract:
  I present a three-dimensional effective theory that describes the
high-temperature equilibrium behavior of the SU(5) theory accurately, but is
much easier to study using non-perturbative methods than the original
four-dimensional one. The effective theory is obtained by perturbatively
integrating out the super-heavy Matsubara modes as well as the heavy temporal
component of the gauge field. Regardless of the particle spectrum of the
original theory, the resulting three-dimensional theory contains only a gauge
field and an adjoint Higgs field. The phase diagram of the theory is analysed
perturbatively and it is shown to have a cellular structure in
three-dimensional parameter space.


title: How sensitive to FCNC can $B^0$ CP asymmetries be?

abstract:
  We show that the study of CP asymmetries in neutral B-meson decays provides a
very sensitive probe of flavour-changing neutral currents (FCNC). We introduce
two new angles, $\alpha_{SM}$ and $\beta_{SM}$, whose main feature is that they
can be readily obtained from the measurement of the CP asymmetries $a_{J/\psi
K_s}$, $a_{\pi^+ \pi^-}$ and the ratio $R_u
\equiv|V_{ud}V_{ub}^*|/|V_{cd}V_{cb}^*|$, providing a quantitative test of the
presence of new physics in a model-independent way.
  Assuming that new physics is due to the presence of an isosinglet down-type
quark, we indicate how to reconstruct the unitarity quadrangles and point out
that the measurements of the above asymmetries, within the expected
experimental errors, may detect FCNC effects, even for values of $|\sum_{i=1}^3
V_{id} V_{ib}^* / (V_{td} V_{tb}^*)| $ at the level of a few times $10^{-2}$.


title:
Corrections of order (Z\alpha)^6 m^2_e/m_\mu in the muonium fine
  structure, induced by three photon exchange diagrams

abstract:
  In the framework of the quasipotential method we calculate the contributions
of the kind \alpha^6\ln\alpha, alpha^6 of three-photon exchange diagrams to the
energy spectrum of muonium $n^3S_1$ state in the leading order on $m_e/m_\mu$.
Analytical expression of obtained correction for arbitrary principal quantum
number is equal to (Z\alpha)^6(m_e/m_\mu)m_e(6\ln(2)-35/48)/n^3.


title: Selection rules at the quark-antiquark vertex of the QCD Pomeron

abstract:
  We derive the full analytic expression for the QCD eikonal coupling of a
quark-antiquark state to the exchanged gluon-gluon state in the BFKL formalism.
The formula is valid for all conformal spin configurations of the
quark-antiquark and gluon-gluon states. In particular, a new selection rule on
conformal spins characterizes the non-dominant BFKL components with intercept
below the Pomeron in the conformal-invariant framework.


title:
Exclusive Nonleptonic Decays of Bottom and Charm Baryons in a
  Relativistic Three-Quark Model: Evaluation of Nonfactorizing Diagrams

abstract:
  Exclusive nonleptonic decays of bottom and charm baryons are studied within a
relativistic three-quark model with a Gaussian shape for the momentum
dependence of the baryon-three-quark vertex. We include factorizing as well as
nonfactorizing contributions to the decay amplitudes. For heavy-to-light
transitions Q -> q u d the total contribution of the nonfactorizing diagrams
amount up to approximately 60% of the factorizing contributions in amplitude,
and up to approximately 30% for b -> c u d transitions. We calculate the rates
and the polarization asymmetry parameters for various nonleptonic decays and
compare them to existing data and to the results of other model calculations.


title: Texture dynamics for neutrinos

abstract:
  An ansatz for mass matrix was recently proposed for charged leptons,
predicting (in its diagonal approximation) $m_\tau\simeq1776.80$ MeV from the
experimental values of $m_e$ and $m_\mu$, in agreement with $m_\tau^{exp}=
1777.00^{+0.30}_{-0.27}$ MeV. Now it is applied to neutrinos. If the amplitude
of neutrino oscillations $\nu_\mu\to\nu_\tau$ is $\sim 1/2$ and
$|m^2_{\nu_\tau}-m^2_{\nu_\mu}|\sim(0.0003 to 0.01) eV^2$, as seems to follow
from atmospheric-neutrino experiments, this ansatz predicts $m_{\nu_e}\ll
m_{\nu_\mu}\sim(0.2 to 1)\times 10^{-2} $ eV and $m_{\nu_\tau}\sim(0.2 to
1)\times 10^{-1} eV$, and also the amplitude of neutrino oscillations $\nu_e
\to \nu_\mu \sim 2^{+4}_{-2}\times 10^{-4}$ (in the vacuum). Such a very small
amplitude for $\nu_e \to \nu_\mu $ is implied by the value of $ m_\tau^{exp} -
1776.80 $ MeV used to determine the deviation of the diagonalizing matrix
$\hat{U}^{(e)}$ from $\hat{1}$ in the lepton Cabibbo-Kobayashi- Maskawa matrix
$\hat{V} = \hat{U}^{(\nu) \dagger}\hat{U}^{(e)}$. Here, $\hat{U}^{(\nu)}$ by
itself gives practically no oscillations $\nu_e \to\nu_\mu$, while it provides
the large oscillations $\nu_\mu \to\nu_\tau$.


title:
Contribution of hadronic vacuum polarization to hyperfine splitting of
  muonic hydrogen

abstract:
  The contribution of hadronic vacuum polarization to the hyperfine splitting
of the muonic hydrogen ground state is calculated with the account of
experimental data on the cross section of e^+e^-\to annihilation into hadrons
and the dipole parameterization of electromagnetic proton form factors.


title: The b-$\tau$-unification in GUTs with non-chiral matter

abstract:
  It is shown, that the presently accepted value for b-quark mass can be
obtained from the requirement of the exact b-$\tau$ unification in the both
non-SUSY and SUSY non-chiral extended GUTs.


title: Inelastic photoproduction of polarised $J/\psi$

abstract:
  The comparison of $J/\psi$ photoproduction data in the inelastic region with
theoretical predictions based on the NRQCD approach has remained somewhat
ambiguous and controversial, in particular at large values of the inelasticity
variable $z$. We study the polar and azimuthal decay angular distribution of
$J/\psi$ mesons as functions of $z$ and transverse momentum $p_t$. Future
measurements of decay angular distributions at the HERA $ep$ collider will
provide a new test of theoretical approaches to factorisation between
perturbation theory and quarkonium bound-state dynamics and shed light on the
colour-octet production fraction in various regions of $z$ and $p_t$.


title:
Improved QCD expansion and the problem of determination of alpha_s and
  the condensates from the tau decays

abstract:
  The problem of determination of $\alpha_{s}$ and the condensates from the
moments of invariant mass distribution in the semileptonic tau decays is
considered. It is investigated how the extracted values of alpha_s(m^{2}_{tau})
and the condensates are affected by the the renormalization scheme dependence
of the next-to-next-to-leading order perturbative corrections to the spectral
moments. A simplified approach is used, in which the nonperturbative
contributions are approximated by the terms of dimension six in the SVZ
expansion, which arise from the four-quark condensates. \\


title: New Physics at LEP2

abstract:
  Searches for new physics in the first year of running of LEP2, at energies of
161 and 172 GeV, are summarized. After a short review of WW results and their
implications on new physics, searches for the Higgs boson and SUSY particles,
analyses of four-jet final states and constraints on possible explanations for
the HERA high Q**2 anomaly are discussed in turn.


title:
Predictions from conformal algebra for the deeply virtual Compton
  scattering

abstract:
  Basing on the constraint equalities which arise from the algebra of the
collinear conformal group and the conformal operator product expansion, we
predict the solutions of the leading order evolution equations for the
non-forward distributions, including transversity, in terms of the conformal
moments; next-to-leading order flavour singlet coefficient functions for the
polarized and unpolarized deeply virtual Compton scattering; as well as the
contribution from renormalon chains to the eigenfunctions of the exclusive
non-singlet evolution kernel.


title: WW Physics at LEP2

abstract:
  The analyses and results on WW physics obtained in the first year of running
of LEP2 are summarized. The determination of the W mass, both through the
measurement of the WW production cross section at a center-of-mass energy of
161 GeV and through the study of the invariant mass distribution of W decay
products in the 172 GeV run are described first. Preliminary results on
searches for anomalous triple gauge-boson vertices are also presented.


title: Comprehensive Study of the Possibility of Day - Night Effect Enhancement

abstract:
  A set of quantitative predictions for the day-night asymmetry in the Super -
Kamiokande detector is presented. For these predictions, neutrino events are
collected in ``samples'' defined by the trajectories in the Earth of the
corresponding solar neutrinos. The more important samples considered here are:
the full sample of neutrinos detected at night, the sample of night neutrinos
which cross the Earth core and the sample of night neutrinos which does not
cross the Earth core. For energy integrated event rates, the day-night
asymmetry for core crossing neutrinos is up to six times bigger than the
day-night asymmetry for the full sample of night neutrinos. When the reduction
in statistics is considered, an effective enhancement up to a factor $\approx
2.3$ is obtained. The selection of core crossing neutrinos may be relevant for
the recoil - $e^-$ spectra too. From these results it is reasonable to expect
the Super Kamiokande detector be able to constrain the small mixing angle
solution of the solar neutrino problem ($\sin^2 2 \theta_v \leq 0.01$) through
the day-night effect. Furthermore, it is proposed that the day-night effect may
limits the total flux of 8B neutrino produced in the Sun. At last, the
sensitivity of these predictions to the Earth model uncertainties is
quantitatively discussed.


title: Cascade Mixing and the CP-Violating Angle Beta

abstract:
  In the decay chain B(d) --> Psi + K --> Psi + (pi l nu), neutral K mixing
follows on the heels of neutral B mixing. This "cascade mixing" leads to an
interference which probes cos(2*beta), where beta is one of the three
CP-violating phase angles which characterize CP violation in the Standard
Model. Widely-discussed future B-system experiments will determine
trigonometric functions of these three phase angles, leaving the underlying
angles themselves discretely ambiguous. A determination of cos(2*beta) through
cascade mixing would eliminate all the discrete ambiguities entirely.


title: New Models of Gauge Mediated Dynamical Supersymmetry Breaking

abstract:
  We propose a simple class of nonrenormalizable models of gauge mediated
dynamical supersymmetry breaking. The models do not have gauge singlet fields.
The Standard Model gauge group is embedded in the global symmetry of the SUSY
breaking sector. At the renormalizable level the models possess a set of
classical flat directions. Only one of those flat directions is unlifted by
quantum effects, and requires nonrenormalizable term to stabilize the potential
for the corresponding modulus. Large vacuum expectation value of this modulus
at the minimum of the potential generates mass terms for the messenger fields.
There are no light messengers, thus this class of models evades difficulties
encountered in earlier constructions using nonrenormalizable models.


title:
Dilepton production by bremsstrahlung of meson fields in nuclear
  collisions

abstract:
  We study the bremsstrahlung of virtual omega mesons due to the collective
deceleration of nuclei at the initial stage of an ultrarelativistic heavy-ion
collision. It is shown that electromagnetic decays of these mesons may give an
important contribution to the observed yields of dileptons. Mass spectra of
positron-electron and muon pairs produced in central Au+Au collisions are
calculated under some simplifying assumptions on the space-time variation of
the baryonic current in a nuclear collision process. Comparison with the CERES
data for 160 AGev Pb+Au collisions shows that the proposed mechanism gives a
noticeable fraction of the observed lepton pairs in the intermediate region of
invariant masses. Sensitivity of the dilepton yield to the in-medium
modification of masses and widths of vector mesons is demonstrated.


title: The VIIth Blois Workshop: Theory Summary and Factorization Issues

abstract:
  Workshop presentations on elastic and diffractive scattering and other recent
advances in hadron physics are summarized. The role of ``factorization'' in
determining parton properties of the pomeron is particularly discussed.


title: Four-quark Operators Relevant to B Meson Lifetimes from QCD Sum Rules

abstract:
  At the order of 1/m_b^3, the B meson lifetimes are controlled by the hadronic
matrix elements of some four-quark operators. The nonfactorizable magnitudes of
these four-quark operator matrix elements are analyzed by QCD sum rules in the
framework of heavy quark effective theory. The vacuum saturation for
color-singlet four-quark operators is justified at hadronic scale, and the
nonfactorizable effect is at a few percent level. However for color-octet
four-quark operators, the vacuum saturation is violated sizably that the
nonfactorizable effect cannot be neglected for the B meson lifetimes. The
implication to the extraction of some of the parameters from B decays is
discussed. The B meson lifetime ratio is predicted as
\tau(B^-)/\tau(B^0)=1.09\pm 0.02. However, the experimental result of the
lifetime ratio \tau(\Lambda_b)/\tau(B^0) still cannot be explained.


title: Complete Result for Positronium Energy Levels at Order alpha^6 m

abstract:
  We have completed theoretical predictions for positronium energy levels
through order alpha^6 m by the calculation of the spin independent, radiative
recoil correction. This contribution is significant and amounts to 10.64 MHz
for the 1S state. We further perform detailed comparison of theoretical
predictions to experimental results for 1S-2S and 2S-2P transitions.


title:
Atmospheric Neutrino Oscillation and a Phenomenological Lepton Mass
  Matrix

abstract:
  We propose simple phenomenological lepton mass matrices which describe the
three neutrinos almost degenerate in mass, leading to a very large mixing angle
between $\nu_\mu$ and $\nu_\tau$, as consistent with a recent report on
atmospheric neutrino oscillation from the Superkamiokande collaboration. Our
matrix model also gives $\nu_e-\nu_\mu$ mixing in agreement with the value
required for neutrino oscillation to explain the solar neutrino problem.


title: Signals for Neutralino Box Effects at LEP2

abstract:
  We have computed the contribution to the observables of the final two fermion
channel at LEP2, at the limiting energy $\sqrt{q^2}=200 GeV$, coming from boxes
with two neutralinos of purely gaugino type, of mass $M=100 GeV$. We find a
potentially visible effect only for the muon channel, in the cross section and,
to a lesser extent, in the forward-backward asymmetry. Analogous effects coming
from the chargino box are also briefly discussed.


title: k-Factorization and Next-to-leading BFKL Kernel

abstract:
  I review recent results by Fadin,Lipatov and collaborators and by our
group,leading to the almost complete calculation of the next-to-leading BFKL
kernel,of its eigenvalues,and of the resummed gluon anomalous dimension.
Qualitative implications for small-x structure functions include consistent
running coupling effects and a sizeable decrease of the Pomeron intercept,so as
to slow down the small-x rise at low values of Q.


title: An Asymptotically Free Extension of QCD and ALEPH Four Jet Events

abstract:
  We show that a recently proposed extension of QCD by the addition of a
multiplet of scalars transforming as (2,2,1) under $SU(2)_L\times SU(2)_R\times
SU(3)_ {colour}$ provides a natural and parameter-free explanation for many
observed features of the excess 4 jet events reported by ALEPH.


title:
Filtering Out Signals of Gauge-Mediated Supersymmetry Breaking: Can We
  Always Eliminate Conventional Supersymmetric Effects ?

abstract:
  We investigate the signal $\gamma\gamma$ + missing energy in a high-energy
linear $e^+e^-$ collider, with a view to differentiating between gauge-mediated
supersymmetry breaking and the conventional supersymmetric models. Prima facie,
there is considerable chance of confusion between the two scenarios if the
assumption of gaugino mass unification is relaxed. We show that the use of
polarized electron beams enables one to distinguish between the two schemes in
most cases. There are some regions in the parameter space where this idea does
not work, and we suggest some additional methods of distinction. We also
perform an analysis of some signals in the gauge-mediated model, coming from
the pair production of the second-lightest neutralino.


title: Exclusive charmonium decays

abstract:
  The role of power corrections and higher Fock-state contributions to
exclusive charmonium decays will be discussed. It will be argued that the J/Psi
(Psi') decays into baryon-antibaryon pairs are dominated by the valence
Fock-state contributions. P-wave charmonium decays, on the other hand, receive
strong contributions from the c cbar g Fock states since the valence Fock-state
contributions are suppressed in these reactions. Numerical results for J/Psi
(Psi') --> B Bbar decay widths will be also presented and compared to data.


title:
Chiral-odd transversity spin structure function $h_1(x)$ of the nucleon
  in a constituent quark model

abstract:
  We study the chiral-odd transversity spin-dependent quark distribution
function $h_1 (x)$ of the nucleon in a constituent quark model. The twist-2
structure functions, $f_1(x)$, $g_1(x)$ and $h_1(x)$ are calculated within the
diquark spectator approximation. Whereas an inequality $f_1(x) > h_1(x) >
g_1(x)$ holds with the interaction between quark and diquark being scalar, the
axial-vector effective quark-diquark interaction, which contributes to the
$d$-quark distribution, does not lead to such a simple relation. We find that
$h_1(x)$ for the $d$-quark becomes somewhat smaller than $g_1^d (x)$, when we
fix the model parameter to reproduce known other structure functions. We also
include corrections due to the non-trivial structure of the constituent quark,
which is modeled by the Goldstone boson dressing. This improves agreements of
$f_1(x)$ and $g_1(x)$ with experiments, and brings further reduction of
$h_1^d(x)$ distribution. Consequences for semi-inclusive experiments are also
discussed.


title: A brief review of R-parity-violating couplings

abstract:
  I review the upper limits on the R-parity-violating Yukawa couplings from
indirect searches. Some limits have been updated using recent data.


title: Semileptonic B decays to excited charm mesons

abstract:
  Exclusive semileptonic B decays to the lightest excited charmed mesons are
investigated at order $\Lambda_{QCD}/m_Q$ in the heavy quark effective theory.
At zero recoil, $\Lambda_{QCD}/m_Q$ corrections to the matrix elements of the
weak currents can be written in terms of the leading Isgur-Wise functions for
the corresponding transition and meson mass splittings. The differential decay
rates are predicted, including $\Lambda_{QCD}/m_Q$ corrections with some model
dependence away from zero recoil. Applications to B decay sum rules and
factorization are presented.


title: Renormalizations in Softly Broken SUSY Gauge Theories

abstract:
  The supergraph technique for calculations in supersymmetric gauge theories
where supersymmetry is broken in a "soft" way (without introducing quadratic
divergencies) is reviewed. By introducing an external spurion field the set of
Feynman rules is formulated and explicit connections between the UV
counterterms of a softly broken and rigid SUSY theories are found. It is shown
that the renormalization constants of softly broken SUSY gauge theory also
become external superfields depending on the spurion field. Their explicit form
repeats that of the constants of a rigid theory with the redefinition of the
couplings. The method allows us to reproduce all known results on the
renormalization of soft couplings and masses in a softly broken theory. As an
example the renormalization group functions for soft couplings and masses in
the Minimal Supersymmetric Standard Model up to the three-loop level are
calculated.


title: The b-quark and Symmetries of the Strong Interaction

abstract:
  Applications of HQET and NRQCD to fragmentation are briefly reviewed. The
special role of the b-quark in applications of heavy quark symmetry is
discussed. Predictions of HQET for semileptonic B decays to excited charmed
mesons are considered.