title:
CHIRAL BACKGROUND FOR THE TWO PION EXCHANGE NUCLEAR POTENTIAL: A
  PARAMETRIZED VERSION

abstract:
  We argue that the minimal chiral background for the two-pion exchange
nucleon-nucleon interaction has nowadays a rather firm conceptual basis, which
entitles it to become a standard ingredient of any modern potential. In order
to facilitate applications, we present a parametrized version of a
configuration space potential derived previously. We then use it to assess the
phenomenological contents of some existing NN potentials.


title:
PRODUCTION OF DRELL--YAN PAIRS IN HIGH ENERGY NUCLEON--NUCLEON
  COLLISIONS

abstract:
  We compute cross sections for the Drell-Yan process in N--N collisions at
next-to-leading order in $\alpha_s$. The mass, rapidity, transverse momentum,
and angular dependence of these cross sections are presented. An estimate of
higher order corrections is obtained from next-to-next-to-leading order
calculation of the mass distribution. We compare the results with some of the
existing data to show the quality of the agreement between calculations and
data. We present predictions for energies which will become available at the
RHIC and LHC colliders. Uncertainties in these predictions due to choices of
scale, scheme and parton distribution are discussed.


title: CP Nonconservation in $e^+e^-\to t\bar tg$

abstract:
  CP violation effects in $e^+ e^- \to t\bar tg$ are examined. CP-odd,
$T_n$-odd and $T_n$-even observables can both be used to extract information on
the real and imaginary parts of Feynman amplitudes. Two Higgs doublet model
with CP violating phase from neutral Higgs exchange is used to estimate
possible effects.


title: TESTS OF FACTORIZATION IN COLOR SUPPRESSED NONLEPTONIC B DECAY MODES,

abstract:
  We propose a number of tests of factorization for the color-suppressed
nonleptonic decay channels: $B \to K^{(*)} \; \eta_c$ and $B \to K^{(*)} \;
\eta^\prime_c$. The relevant leptonic constants and form factors are calculated
within the QCD sum rules approach.


title:
QCD Corrections to Electroweak Annihilation Decays of Superheavy
  Quarkonia

abstract:
  QCD corrections to all the allowed decays of superheavy groundstate quarkonia
into electroweak gauge and Higgs bosons are presented. For quick estimates,
approximations that reproduce the exact results within less than at worst two
percent are also given.


title: Anomalous Weak Boson Couplings: Suggestions from Unitarity and Dynamics

abstract:
  Taking into account the constraints from LEP1 and lower energy experiments,
we identify the seven $SU(2)\times U(1)$ gauge invariant purely bosonic $dim=6$
operators which provide a quite general description of how New Physics could
reflect in the bosonic world, if it happens that all new degrees of freedom are
too heavy to be directly produced in the future colliders. Five of these
operators are CP conserving and the remaining ones are CP violating. We derive
the unitarity constraints for the CP violating operators and compare them with
the already known constraints for the CP conserving ones. Dynamical
renormalizable models are also presented, which partly elucidate what the
appearance of each of these operators can teach us on the mechanism of
spontaneous gauge symmetry breaking.


title:
QCD Radiative Correction to Zero Recoil Sum Rules for Heavy Flavor
  Transitions in the Small Velocity Limit.

abstract:
  We consider the small velocity sum rules for heavy flavour semileptonic
transitions that are used to estimate the zero recoil values of semileptonic
heavy flavour form factors. We analyze the complete O($\alpha _S$) radiative
correction to these sum rules. The corrections are universal and influence all
"model-independent" bounds previously derived for semileptonic form factors at
zero recoil.


title: Form Factor Relations for Heavy-to-Light Transitions

abstract:
  Assuming simple properties of the spectator particle in weak decays the form
factors of hadronic current matrix elements are shown to be related to a single
universal function. The Isgur-Wise result for heavy-to-heavy transitions
follows as well as similar relations for heavy-to-light decay processes. The
approximation should hold for total energies of the final particle large
compared to the confinement scale. A comparison with experimentally determined
D-decay form factors and QCD sum rule results for B-decays is very encouraging.


title: Triviality Bounds in the Next to Minimal Supersymmetric Standard Model

abstract:
  We study the implications of the triviality problem for the Higgs masses and
other relevant parameters in the Next to Minimal Supersymmetric Standard Model
(NMSSM). By means of triviality, a new way to constrain parameters is proposed,
and therefore we are able to derive triviality bounds on the heaviest-Higgs
mass, the lightest-Higgs mass, the soft SUSY- breaking parameters, and the
vacuum expectation value of the Higgs gauge singlet through a thorough
examination of the parameter space. The triviality upper bound on the
lightest-Higgs mass predicted by NMSSM is indeed larger than the upper bound
predicted by MSSM.


title: The Minimal Supersymmetric Model of Higgs-Higgs Condensation

abstract:
  This paper is motivated by three issues associated with the supersymmetric
extension of the standard model: the $\mu$ problem, the possibility of raising
the upper bound on the lightest-Higgs mass, and the triviality problem
associated with the Higgs sector. A new scheme based on the Higgs-Higgs
condensation is proposed, and it is shown that these three issues are well
solved by this scheme. As the first realization of this new scheme, the Minimal
Supersymmetric Model of Higgs-Higgs Condensation (MSMHHC) is constructed and
studied in detail. The MSMHHC is identical with the MSSM (Minimal
Supersymmetric Standard Model) in the fundamental particle content, and their
lagrangians differ only in the Higgs sector. The Higgs sector of the MSMHHC is
based on the softly-broken supersymmetric Nambu$-$Jona-Lasinio model with the
four-field interaction of the Higgs doublets. At low energy, these two Higgs
doublets condense into two neutral Higgs gauge singlets, and the low-energy
effective lagrangian of the MSMHHC has the form of the non-minimal
supersymmetric standard model which contains two more Higgs singlets than the
MSSM. Another unique feature of the MSMHHC is that heavy top quark always
implies strongly-interacting low-energy Higgs sector, i.e., a large mass for
the lightest Higgs boson. A systematic study of the parameter space is also
made in order to reveal the qualitative features of the MSMHHC. Finally, we
comment on the question "How large can the lightest-Higgs mass be?" with the
conclusion that the supersymmetric model of Higgs-Higgs condensation will be
the most promising candidate if the lightest-Higgs mass of the MSSM is excluded
by the future experiments.


title:
On the Phase of $B^0$--$\bar {B^0}$ Mixing Matrix Elements in the SUSY
  Standard Model

abstract:
  It is shown that the complex phase of $B^0$--$\bar {B^0}$ mixing matrix
element is same as that of the standard model one up to the minor correction of
the order of $(m_c/m_t)^2$ or less in the SUSY standard model. This conclusion
is valid as far as the Yukawa coupling constants are perturbative and
realistic, and can be available for other realistic models where generation
mixing and CP violation are solely due to Yukawa interaction among quarks and
Higgs doublets.


title:
Exclusive high-$Q^2$ electroproduction: light-cone wave functions and
  electromagnetic form factors of mesons,

abstract:
  We apply the light-cone technique to electroproduction reaction $ep\to
e\pi^+n$ long considered as a means of measuring the electromagnetic form
factor of the pion. We show that the interpretation of the long-standing puzzle
of large transverse cross section ($\sigma_T$) in terms of the $\gamma^*\rho\to
\pi$ transition on the $\rho$ mesons in the light-cone proton is possible, but
requires quite a slow decrease of the $F_{\rho\pi}(\q2)$ form factor. This
interpretation can be tested in the related $ep\to e\pi^0p$ reaction.
Corrections which are due to the final-state meson-baryon interactions (FSI)
are evaluated and are shown to amount to a $25\%$ effect at moderately large
$\q2$. Vanishing FSI with increasing $Q^2$ - the color transparency phenomenon
- is shown to be very strong.


title: Theoretical Ambiguities of QCD Predictions at the Z^0 Peak.

abstract:
  We discuss uncertainties of QCD predictions for the hadronic width of the
$Z^0$ boson. Emphasis is put on quantitative estimates, taking into account the
current precision of experimental data.


title:
On Connection between Coefficient Functions for Deep-Inelastic and
  Annihilation Processes

abstract:
  It has been shown that the one-loop behavior of the axial anomaly, occurring
when the axial current is appropriately normalized, leads to the cancellation
of the corrections of type $C_F^N{\bar \alpha}_s^N,~~ (N\geq 1) $ in the
Crewther relation for the coefficient functions of deep-inelastic and
annihilation processes. The arguments in favour of the overall factorization of
the factor $\beta({\bar \alpha}_s)/ {\bar \alpha}_s$ in all orders of
perturbation theory in this relation are presented.


title: Supersymmetry and Neutrinoless Double Beta Decay

abstract:
  Neutrinoless double beta decay ($\znbb$) induced by superparticle exchange is
investigated. Such a supersymmetric (SUSY) mechanism of $\znbb$ decay arises
within SUSY theories with R-parity non-conservation (\rp). We consider the
minimal supersymmetric standard model (MSSM) with explicit \rp terms in the
superpotential (\rp MSSM). The decay rate for the SUSY mechanism of $\znbb$
decay is calculated. Numerical values for nuclear matrix elements for the
experimentally most interesting isotopes are calculated within pn-QRPA.
Constraints on the \rp MSSM parameter space are extracted from current
experimental half-life limits. The most stringent limits are derived from data
on $^{76}$Ge. It is shown that these constraints are more stringent than those
from other low-energy processes and are competitive to or even more stringent
than constraints expected from accelerator searches.


title:
Convergence of the Optimized Delta Expansion for the Connected Vacuum
  Amplitude -- Anharmonic Oscillator

abstract:
  The convergence of the linear $\delta$ expansion for the connected generating
functional of the quantum anharmonic oscillator is proved. Using an
order-dependent scaling for the variational parameter $\lambda$, we show that
the expansion converges to the exact result with an error proportional to
$\exp(-cN^{1/3})$.


title:
A strongly first order electroweak phase transition from strong
  symmetry-breaking interactions

abstract:
  We argue that a strongly first order electroweak phase transition is natural
in the presence of strong symmetry-breaking interactions, such as technicolor.
We demonstrate this using an effective linear scalar theory of the
symmetry-breaking sector.


title:
Landau Pole Effects and the Parameter Space of the Minimal Supergravity
  Model

abstract:
  It is shown that analyses at the electroweak scale can be significantly
affected due to Landau pole effects in certain regions of the parameter space.
This phenomenon arises due to a large magnification of errors of the input
parameters $m_t$, $\alpha_G$ which have currently a 10 percent uncertainty in
their determination. The influence of the Landau pole on the constraint that
the scalar SUSY spectrum be free of tachyons is also investigated.It is found
that this constraint is very strong and eliminates a large portion of the
parameter space.Under the above constraint the trilinear soft SUSY breaking
term at the electroweak scale is found to lie in a restricted domain.


title: Searching for the Scalar of the Strongly-Coupled Standard Model

abstract:
  We investigate decays of the scalar bound state present in the Abbott-Farhi
model. We show that decays with photons in the final state may have large
branching ratios. We also show that operators coupling the scalar particle to
two photons or to a photon and a Z^0 are not seriously constrained by
electroweak data, unlike other sectors of the Abbott-Farhi model.


title: Parton densities beyond perturbation theory

abstract: Non perturbative corrections to deep inelastic scattering are computed.


title: 1/M Corrections to Baryonic Form Factors in the Quark Model

abstract:
  Weak current-induced baryonic form factors at zero recoil are evaluated in
the rest frame of the heavy parent baryon using the nonrelativistic quark
model. Contrary to previous similar work in the literature, our quark model
results do satisfy the constraints imposed by heavy quark symmetry for
heavy-heavy baryon transitions at the symmetric point $v\cdot v'=1$ and are in
agreement with the predictions of the heavy quark effective theory for
antitriplet-antitriplet heavy baryon form factors at zero recoil evaluated to
order $1/m_Q$. Furthermore, the quark model approach has the merit that it is
applicable to any heavy-heavy and heavy-light baryonic transitions at maximum
$q^2$. Assuming a dipole $q^2$ behavior, we have applied the quark model form
factors to nonleptonic, semileptonic and weak radiative decays of the heavy
baryons. It is emphasized that the flavor suppression factor occurring in many
heavy-light baryonic transitions, which is unfortunately overlooked in most
literature, is very crucial towards an agreement between theory and experiment
for the semileptonic decay $\Lambda_c\to\Lambda e^+\nu_e$. Predictions for the
decay modes $\b,~\Lambda_c \to p\phi,~\Lambda_b\to\Lambda\gamma$,
$\Xi_b\to\Xi\gamma$, and for the semileptonic decays of $\Lambda_b,~\Xi_{b,c}$
and $\Omega_b$ are presented.
  }


title: Direct quark transition potential for $\Lambda N \to NN$ decay

abstract:
  The weak $\Lambda N\to NN$ transition is studied in the valence quark model
approach. The quark component of the two baryon system is described in the
quark cluster model and the weak transition potential is calculated by
evaluating the matrix elements of the $\Delta S=1$ effective weak Hamiltonian.
The transition potential is applied to the decay of hypernuclei and the results
are compared with available experimental data. The results indicate that direct
quark process is significant and qualitatively different when compared with
those in conventional meson-exchange calculations. The direct quark mechanism
predicts the violation of the $\Delta I = 1/2$ rule for this transition.


title: Chiral Perturbation Theory

abstract:
  A short overview of the current state of Chiral Perturbation Theory is given.
This includes a description of the basic assumptions, the usefulness of the
external field method is emphasized using a simple lowest order example. Then
at next-to-leading order the determination of the parameters is discussed. We
also present the status of calculations at ${\cal O}(p^6)$. Finally I present
the extension into 3 directions: estimates of the free parameters, inclusion of
nonleptonic weak and electromagnetic interactions, and inclusion of
non-Goldstone fields in the chiral Lagrangian. Invited Talk at the
International Workshop on Nuclear \& Particle Physics ``Chiral Dynamics in
Hadrons \& Nuclei,'' Feb 6 $\sim$ Feb 10, 1995, Seoul, Korea.


title:
Squeezed and Correlated States of Quantum Fields and Multiplicity
  Particle Distributions

abstract:
  The primary aim of the present paper is to attract the attention of particle
physicists to new developments in studying squeezed and correlated states of
the electromagnetic field as well as of those working on the latest topic to
new findings about multiplicity distributions in quantum chromodynamics. The
new types of nonclassical states used in quantum optics as squeezed states,
correlated states, even and odd coherent states (Schr\"odinger cat states) for
one--mode and multimode interaction are reviewed. Their distribution functions
are analyzed according to the method used first for multiplicity distributions
in high energy particle interactions. The phenomenon of oscillations of
particle distribution functions of the squeezed fields is described and
confronted to the phenomenon of oscillations of cumulant moments of some
distributions for squeezed and correlated field states. Possible extension of
the method to fields different from the electromagnetic field (gluons, pions,
etc.) is speculated.


title: Quark Mass Textures Within a Finite Non-Abelian Dicyclic Group

abstract:
  Using as a flavor symmetry a finite nonabelian dicyclic $Q_{2N}$ group, we
show how to derive quark mass matrices with two arrangements of symmetric
texture zeros which are phenomenologically viable. Three other such acceptable
textures in the recent literature are unattainable in this approach and hence
disfavored. We assume massive vector-like fermions and Higgs singlets
transforming as judiciously-chosen $Q_{2N}$ doublets and use the tree-level
mass generation mechanism of Froggatt and Nielsen.


title: Confinement and scaling in deep inelastic scattering

abstract:
  We show that parton confinement in the final state generates large $1/Q^2$
corrections to Bjorken scaling, thus leaving less room for the logarithmic
corrections. In particular, the $x$-scaling violations at large $x$ are
entirely described in terms of power corrections. For treatment of these
non-perturbative effects, we derive a new expansion in powers of $1/Q^2$ for
the structure function that is free of infra-red singularities and which
reduces corrections to the leading term. The leading term represents scattering
from an off-mass-shell parton, which keeps the same virtual mass in the final
state. It is found that this quasi-free term is a function of a new variable
$\bar x$, which coincides with the Bjorken variable $x$ for $Q^2\to\infty$. The
two variables are very different, however, at finite $Q^2$. In particular, the
variable $\bar x$ depends on the invariant mass of the spectator particles.
Analysis of the data at large $x$ shows excellent scaling in the variable $\bar
x$, and determines the value of the diquark mass to be close to zero. $\bar
x$-scaling allows us to extract the structure function near the elastic
threshold. It is found to behave as $F_2\sim (1-x)^{3.7}$. Predictions for the
structure functions based on $\bar x$-scaling are made.


title: NON-UNIFIED SPARTICLE AND PARTICLE MASSES IN UNIFIED THEORIES.

abstract:
  We give examples of minimal extensions of the simplest SU(5) SUSY-GUT in
which all squarks and sleptons of a family have different tree level masses at
the unification scale. This phenomenon is general; it occurs when the quarks
and leptons are the light remnants of a theory which contains extra heavy
families at the unification scale. The examples have interesting relations
between Yukawa couplings: In one model the ratio of the top to bottom Yukawas
is as large as $\simeq 3$, partly accounting for the large $m_t /m_b$. Another
gives $m_b/m_\tau$ between 2/3 and 1; this relaxes the strict bounds on the top
mass and neutrino properties that come from $b$--$\tau$ unification. Still
another allows $ m_s/m_\mu$ to be between 1/6 and 1 and evades the potentially
problematic GUT relation of $m_s=m_\mu$. The final example has horizontal
sparticle splittings in spite of the existence of horizontal symmetries.


title: Constraints on the light quark masses from the heavy meson spectrum

abstract:
  We use the observed $SU(3)$ breaking in the mass spectrum of mesons
containing a single heavy quark to place restrictions on the light quark
current masses. A crucial ingredient in this analysis is our recent
first-principles calculation of the electromagnetic contribution to the
isospin-violating mass splittings. We also pay special attention to the role of
higher-order corrections in chiral perturbation theory. We find that large
corrections are necessary for the heavy meson data to be consistent with $m_u =
0$.


title:
Theory, Phenomenology, and Prospects for Detection of Supersymmetric
  Dark Matter

abstract:
  One of the great attractions of minimal super-unified supersymmetric models
is the prediction of a massive, stable, weakly interacting particle (the
lightest supersymmetric partner, LSP) which can have the right relic abundance
to be a cold dark matter candidate. In this paper we investigate the identity,
mass, and properties of the LSP after requiring gauge coupling unification,
proper electroweak symmetry breaking, and numerous phenomenological
constraints. We then discuss the prospects for detecting the LSP from (1) LSP
annihilations into positrons, anti-protons, and gamma rays in the galactic
halo, (2) large underground arrays to detect upward going muons arising from
LSP capture and annihilation in the sun and earth, (3) elastic collisions on
matter in a table top apparatus, and (4) production of LSPs or decays into LSPs
at high energy colliders. Our conclusions are that space annihilation
experiments and large underground detectors are of limited help in initially
detecting the LSP although perhaps they could provide confirmation of a signal
seen in other experiments, while table top detectors have considerable
discovery potential. Colliders, however, might be the best dark matter
detectors of all.


title: A New Look At Neutrino Limits From Big Bang Nucleosynthesis

abstract:
  We take a fresh look at the limits on the number of neutrino flavors derived
from big bang nucleosynthesis. In particular, recent measurements of the \he4
abundance enable one to estimate the primordial \he4 mass fraction at $Y_p =
0.232 \pm .003(stat) \pm .005(syst)$. For a baryon to photon ratio, $\eta$,
consistent with the other light elements, this leads to a best fit for the
number of neutrino flavors $N_\nu < 3$ (the precise number depends on $\eta$)
indicating a very strong upper limit to $N_\nu$. Here, we derive new upper
limits on $N_\nu$, paying special attention to the fact that the best estimate
may lie in an unphysical region ($N_\nu < 3$ if all three neutrino flavors are
light or massless; the lower bound to $N_\nu$ may even be as low as 2, if the
small window for a $\nu_\tau$ mass is exploited.) Our resulting upper limits
therefore depend on whether $N_\nu \ge 2$ or 3 is assumed. We also explore the
sensitivity of our results to the adopted value of $\eta$ and the assumed
systematic errors in $Y_p$.


title: Phases in the MSSM, Electric Dipole Moments and Cosmological Dark Matter

abstract:
  We consider the effect of CP violating phases in the MSSM on the relic
density of the lightest supersymmetric particle (LSP). In particular, we find
that the upper limits on the LSP mass are relaxed when phases in the MSSM are
allowed to take non-zero values when the LSP is predominantly a gaugino (bino).
Previous limits of $\mb \la 250$ GeV for $\Omega h^2 < 0.25$ can be relaxed to
$\mb \la 650$ GeV. We also consider the additional constraints imposed by the
neutron and electron electric dipole moments induced by these phases. Though
there is some restriction on the phases, the bino mass may still be as large as
$\sim$ 350 GeV and certain phases can be arbitrarily large.


title: THE SENSITIVITY TO NEW PHYSICS OF A LEP SCAN IN 1995

abstract:
  We study the implications of possible off-peak measurements in the 1995 LEP
run, in regard to probing physics beyond the Standard Model. To do so, we
determine the accuracy with which various nonstandard couplings can be expected
to be measured in the three different scan scenarios recently discussed by
Clarke and Wyatt. We find that each scan scenario allows greater sensitivity to
a different set of new physics couplings. Oblique parameters are best measured
with the longest scan, while nonstandard fermion couplings to the Z tend to be
better constrained (albeit only marginally) if all of the 1995 LEP measurements
are taken on the Z peak.


title:
The bootstrap condition for many reggeized gluons and the photon
  structure function at low x and large number of colours.

abstract:
  The bootstrap condition is generalized to $n$ reggeized gluons. As a result
it is demonstrated that the intercept generated by $n$ reggeized gluons cannot
be lower than the one for $n=2$. Arguments are presented that in the limit
$N_{c}\rightarrow\infty$ the bootstrap condition reduces the $n$ gluon chain
with interacting neighbours to a single BFKL pomeron. In this limit the leading
contribution from $n$ gluons corresponds to $n/2$ non-interacting BFKL pomerons
(the $n/2$ pomeron cut). The sum over $n$ leads to a unitary
$\gamma^{\ast}\gamma$ amplitude of the eikonal form.


title: A Monte Carlo Calculation of Atmospheric Muon and Neutrino Fluxes

abstract:
  Production of muons and neutrinos in cosmic ray interactions with the
atmosphere has been investigated with a cascade simulation program based on
Lund Monte Carlo programs. The resulting `conventional' muon and neutrino
fluxes (from $\pi ,K$ decays) agree well with earlier calculations, whereas the
improved charm particle treatment used in this study gives significantly lower
`prompt' fluxes compared to earlier estimates. This implies better prospects
for detecting very high energy neutrinos from cosmic sources.


title: Attractive Channel Skyrmions and the Deuteron

abstract:
  The deuteron is described as a quantum state on a ten-dimensional manifold
$M_{10}$ of Skyrme fields of degree two, which are obtained by calculating the
holonomy of $SU(2)$ instantons. The manifold $M_{10}$ includes both toroidal
configurations of minimal energy and configurations which are approximately the
product of two Skyrmions in the most attractive relative orientation. The
quantum Hamiltonian is of the form $-\Delta +V$, where $\Delta$ is the
covariant Laplace operator on $M_{10}$ and $V$ is the potential which $M_{10}$
inherits from the Skyrme potential energy functional. Quantum states are
complex-valued functions on the double cover of $M_{10}$ satisfying certain
constraints. There is a unique bound state with the quantum numbers of the
deuteron, and its binding energy is approximately 6 MeV. Some of the deuteron's
electrostatic and magnetostatic properties are also calculated and compared
with experiment.


title: Once more about the $\omega \to 3\pi$ contact term

abstract:
  The manifestations of the $\omega \to 3\pi$ contact term and its unitary
partners are investigated in the framework of the chiral effective lagrangian
theory with vector mesons. We conclude that nowadays the existence and
magnitude of the contact term can be extracted neither from theory, nor
experiment. The theoretical uncertainty is caused by the one-loop corrections.
Some speculations about them lead to the generalized KSRF relation
$\frac{f_\pi^2g^2_{\rho \pi \pi}}{m_\rho^2}=\frac{m_K}{2\sqrt{2} \pi f_\pi}$.


title:
Supercritical Pomeron and eikonal representation of the diffraction
  scattering amplitude

abstract:
  The intercept of the supercritical Pomeron is examined with the use of
different forms of the scattering amplitudes of the bare Pomeron. The
one-to-one correspondence between the eikonal phase and the ratio of the
elastic and total cross section is shown. Based on new experimental data of the
CDF Collaboration, the intercept and power of the logarithmic growth of the
bare and total Pomeron amplitude are analyzed. It is shown that as a result of
the eikonalization procedure, the bare QCD Pomeron becomes compatible with
experiment.


title: $\xi(2230)$ is likely to be a glueball

abstract:
  On the basis of the recent results of $\xi(2230)\rightarrow \pi^+\pi^-, p\bar
p$ and $\xi(2230)\rightarrow K^+K^-,~K_SK_S$, measured by the BES Collaboration
in $J/\psi$ radiative decays, combined with the PS185 experiment of $p\bar
p\rightarrow \xi(2230)\rightarrow K\bar K$, we argue that because of its very
narrow partial decay widths to $\pi\pi$ and $K\bar K$ ( less than $1~MeV$ ),
its large production rate in $J/\psi$ radiative decays, and its flavor-
symmetric couplings to $\pi\pi$ and $K\bar K$, the $\xi(2230)$ is very likely
to be a $J^{PC}=(even)^{++}$ glueball.


title:
Possible effects of color screening and large string tension in heavy
  quarkonium spectrum

abstract:
  Possible effects of the color screened confinement potential are
investigated. Color screened linear potential with a large string tension
$T=(0.26-0.32)GeV^2$ is suggested by a study of the $c\bar c$ and $b\bar b$
spectra. The $\psi (4160)$ and $\psi (4415)$ are respectively assigned as the
$\psi (4S)$-dominated and the $\psi (5S)$ $c\bar c$ states. Satisfactory
results for the masses and leptonic widths (with QCD radiative corrections) of
$c\bar c$ and $b\bar b$ states are obtained.


title: The quark axial vector coupling and heavy meson decays

abstract:
  Form factors and decay widths for $D^{\ast}\rightarrow D \gamma$ and
$D^{\ast}\rightarrow D \pi$ decays are estimated in a relativistic constituent
quark model. Relativistic corrections due to light quarks are found to be
substantial and to suppress the vector and axial vector form factors. The CLEO
experimental value of $R^0_{\gamma}\equiv \Gamma (D^{\ast 0}\rightarrow D^{0}
\gamma)/ \Gamma (D^{\ast 0}\rightarrow D^{0} \pi^{0})=0.572\pm 0.057\pm 0.081$
is used to determine the quark axial vector coupling $g_A$, which is found to
be $0.6-0.8$ for $m_u=(350-200) MeV$ correspondingly, as compared with the
chiral model result $g_{A}= 0.8-0.9$. The heavy meson-pion strong coupling $g$
is found to be $0.4-0.6$, much smaller than $g=1$ which is expected in the
large $N_{C}$ and nonrelativistic limit, but consistent with some heavy hadron
chiral theory and QCD sum rule results. The failure of nonrelativistic
treatment for the light quark in the heavy meson decays is also emphasized.


title: Hadronic matrix elements and radiative $B\to K^{*}\gamma$ decay

abstract:
  Within the standard model, we calculate the radiative $B\rightarrow
K^{\star}\gamma$ decay rate based on a Bethe-Salpeter description for the meson
wave functions and the hadronic matrix elements. With a reasonable choice of
parameters the branching ratio BR($B \rightarrow K^{\star}\gamma$) is found to
be $(3.8-4.6)\times 10^{-5}$, which is in agreement with the CLEO experimental
data. We also find with $m_{b}=5.12 GeV$ the ratio $R\equiv {\Gamma
(B\rightarrow K^{\star}\gamma )}/{\Gamma (b\rightarrow s\gamma )}=(10-12)\%$,
which can be slightly larger if a smaller $m_{b}$ is chosen. In this approach,
the light degrees of freedom in mesons are treated as light constituent quarks
with relativistic kinematics, and the form factors in the decay amplitude are
essentially determined by the relativistic kenematics and the overlap of wave
functions of the initial and final state mesons. Due to the large recoil
momentum of the $K^{\star}$ meson at the $B$ meson rest frame, the form factors
are sensitive to the overlap integral of the meson wave functions, which are
determined dynamically by a QCD-motivated inter-quark potential. Relativistic
effects on the meson wave functions mainly due to the Breit-Fermi interactions
are found to be significant in determining the decay rate.


title:
Gluon Distributions in Real and Virtual Photon and the Photon Structure
  Function

abstract:
  Gluon distributions in real and virtual photons are calculated using
evolution equations in the NLO approximation. The quark distributions in the
photon determined on the basis of the QCD sum rule approach in ref.[1] are
taken as an input. It is shown that gluon distribution in the photon can be
reliably determined up to $x = 0.03 \div 0.05$ much lower than the
corresponding values in the case of quark distributions.Two variants of the
calculations are considered: (1) it is assumed that there are no intrinsic
gluons in the photon at some low normalization point $Q^2 = Q^2_0 \sim 1
GeV^2$; (2) it is assumed that gluonic content of the photon at low $Q^2_0$ is
described by gluonic content of vector mesons $\rho, \omega, \varphi$. The
gluon distributions in these two variants appear to be different. This fact
permits one to clarify the origin of nonperturbative gluonic content of the
photon by comparing the results with experiment. Structure functions $F_2(x)$
for real and virual photon are calculated and it is shown that in the region $x
\geq 0.2$ where QCD approach is valid, there is a good agreement with
experiment.


title: Charmed particle production in hadron-hadron collision

abstract:
  In the framework of Quark--Gluon--String Model developed recently in ITEP we
calculate spectra of charmed particles $D$, $D_s$, $\Lambda_c$, $\Xi_c$,
$\Omega_c$ in hadron--hadron collisions taking into account the decays of
$S$--wave resonances like $D^*$, $D^*_s$, $\Sigma_c$, $\Sigma^*_c$, $\Xi^*_c$,
$\Xi'_c$, and $\Omega^*_c$. We describe the bulk of the existing data on $D$,
$D^*$, and $\Lambda_c$ production in $\pi p$ and $pp$ collisions and predict
the yield of charmed particles in $\Sigma^-p$ and $\Xi^-p$ reactions at hyperon
beam energies of $340\;GeV/c$ and $600\;GeV/c$. Because of significant
production of baryon resonances our predictions for unfavored fragmentation
differ from predictions of other models which do not take resonance production
into account.


title: A string no-scale supergravity model and its experimental consequences

abstract:
  We propose a string-derived model based on the gauge group $SU(5)\times U(1)$
which satisfies the stringent constraints from no-scale supergravity, allows
gauge coupling unification at the string scale, and entails previously
unexplored correlations among various sectors of the model. All supersymmetric
observables are given in terms of a single mass parameter with self-consistency
of the model determining the rest, including $\tan\beta=2.2-2.3$ and
$m_t\approx175\GeV$. A small non-universality of the scalar masses at the
string scale produces a downward shift in the right-handed slepton masses at
the electroweak scale, such that for $m_{1/2}\gsim180\GeV$ these particles
become lighter than the lightest neutralino. This cutoff in the parameter space
entails the imminent discovery of charginos at the Tevatron via trilepton
events ($m_{\chi^\pm_1}<90\GeV$). Also, the lightest Higgs boson
($m_h<90\GeV$), the lightest chargino, and the right-handed sleptons
($m_{\tilde\ell_R}<50\GeV$) should be readily observable at LEPII. We also
discuss the model predictions for $B(b\to s\gamma)$, $(g-2)_\mu$, $R_b$, and
the prospects for direct neutralino dark matter detection.


title:
Higgs boson production at $e^+ e^-$ colliders: a model independent
  approach.

abstract:
  We consider non-Standard Model physics effects using an effective lagrangian
parameterization. We determine the operators whose effects are most significant
and extract the sensitivity to the scale of new physics generated by the
existing data. We then consider processes containing the Higgs particle in
$e^+e^-$ colliders as a probe for new physics effects, and demonstrate their
usefulness in this area.


title: CLASSICAL PHOTOABSORPTION SUM RULES

abstract:
  We use a quantum loop expansion to derive sum rule constraints on polarized
photoabsorption cross sections in the Standard Model, generalizing earlier
results obtained by Altarelli, Cabibbo, and Maiani. We show that the
logarithmic integral of the spin-dependent photoabsorption cross section
$\int^\infty_{\nu_{th}} {d\nu\over \nu} \Delta \sigma_{\rm Born}(\nu) $
vanishes for any $2 \to 2$ Standard Model or supersymmetric process $\gamma a
\to b c$ in the classical, tree-graph approximation. Here $\nu = {p \cdot q}/M$
and $\Delta \sigma(\nu) = \sigma_P(\nu)- \sigma_A(\nu)$ is the difference
between the photoabsorption cross section for parallel and antiparallel photon
and target helicities. Tests of the sum rule for the reactions $\gamma e \to W
\nu$ and $\gamma \gamma \to W^+ W^-$ can provide new tests of the canonical
magnetic and quadrupole couplings of the Standard Model. We also extend the sum
rule to certain virtual photon processes.


title: Cosmology with a TeV mass GUT Higgs

abstract:
  The most natural way to break the GUT gauge symmetry is with a Higgs field
whose vacuum expectation value is of order $10^{16}\,\mbox{GeV}$ but whose mass
is of order $10^2$ to $10^3\,\mbox{GeV}$. This can lead to a cosmological
history radically different from what is usually assumed to have occurred
between the standard inflationary and nucleosynthesis epochs, which may solve
the gravitino and Polonyi/moduli problems in a natural way.


title: Lepton Mass Matrix Models

abstract:
  The smallness and hierarchy in fermion parameters could be the result of
selection rules due to an Abelian horizontal symmetry broken by a small
parameter. When applied to the lepton sector, then for a large class of models,
a number of interesting order of magnitude relations arise: with $i<j$,
$m(\nu_i)/m(\nu_j)\sim\sin^2\theta_{ij}$;
$m(\ell^-_i)/m(\ell^-_j)\lsim\sin\theta_{ij}$; $m(\nu_i)/m(\nu_j)\gsim
m^2(\ell^-_i)/m^2(\ell^-_j)$; $m(\nu_e)\lsim m(\nu_\mu)\lsim m(\nu_\tau)$. The
relations between neutrino masses and mixings may become exact if the
horizontal symmetry together with holomorphy induce certain zero entries in the
lepton mass matrices. A full high energy theory is likely to include scalars
with flavor changing couplings and heavy leptons in vector representations;
however, the masses of these particles are too heavy to be directly observed in
experiment. Indirect evidence for the horizontal symmetry may arise from other
sectors of the theory: non-degenerate sleptons are allowed as the symmetry
aligns lepton and slepton mass matrices; light leptoquarks are allowed as the
symmetry can make their couplings diagonal and chiral.


title:
Gluonic and leptonic decays of heavy quarkonia and the determination of
  $\alpha_s(m_c)$ and $\alpha_s(m_b)$

abstract:
  QCD running coupling constant $\alpha_s(m_c)$ and $\alpha_s(m_b)$ are
determined from heavy quarkonia $c\overline{c}$ and $b\overline{b}$ decays. The
decay rates of $V\rightarrow 3g$ and $V\rightarrow e^+ e^-$ for $V=J/\psi$ and
$\Upsilon$ are estimated by taking into account both relativistic and QCD
radiative corrections. The decay amplitudes are derived in the Bethe-Salpeter
formalism, and the decay rates are estimated by using the meson wavefunctions
which are obtained with a QCD-inspired inter-quark potential. For the
$V\rightarrow 3g$ decay we find the relativistic correction to be very large
and to severely suppress the decay rate. Using the experimental values of ratio
$R_g\equiv \frac {\Gamma (V\longrightarrow 3g)}% {\Gamma (V\longrightarrow
e^{+}e^{-})}\approx 10,~32 $ for $V=J/\psi, ~\Upsilon$ respectively, and the
calculated widths , we find $\alpha_{s}(m_c)=0.29\pm 0.02 $ and
$\alpha_s(m_b)=0.20\pm 0.02$. These values for the QCD running coupling
constant are substantially enhanced, as compared with the ones obtained without
relativistic corrections, and are consistent with the QCD scale parameter
$\Lambda_{\overline {MS}}^{(4)}% \approx 200MeV$. We also find that these
results are mainly due to kinematic corrections and not sensitive to the
dynamical models.


title: Strongly Coupled Electroweak Symmetry Breaking: Implications of Models

abstract:
  We discuss the phenomenology of models of dynamical electroweak symmetry
breaking which attempt to generate the observed fermion mass spectrum. After
briefly describing the variety of and constraints on proposed models, we
concentrate on the signatures of colored pseudo-Nambu-Goldstone bosons and
resonances at existing and proposed colliders. These particles provide a
possibly unique signature: strongly produced resonances associated with
electroweak symmetry breaking. (This is the subgroup report for the
``Electroweak Symmetry Breaking and Beyond the Standard Model" working group of
the DPF Long Range Planning Study. This report will appear as a chapter in
``Electroweak Symmetry Breaking and Beyond the Standard Model", edited by T.
Barklow, S. Dawson, H.E. Haber, and J. Siegrist, to be published by World
Scientific.)


title: Isospin Breaking and Fine Tuning in Top-Color Assisted Technicolor

abstract:
  Recently, Hill has proposed a model in which new, potentially low-energy,
top-color interactions produce a top-condensate ({\em a la}
Nambu---Jona-Lasinio) and accommodate a heavy top quark, while technicolor is
responsible for producing the $W$ and $Z$ masses. Here we argue that isospin
breaking gauge interactions, which are necessary in order to split the top and
bottom quark masses, are likely to couple to technifermions. In this case they
produce a significant shift in the $W$ and $Z$ masses (i.e.~contribute to
$\Delta \rho_* = \alpha T$) if the scale of the new interactions is near 1 TeV.
In order to satisfy experimental constraints on $\Delta \rho_*$, we find that
either the effective top quark coupling or the top-color coupling must be
adjusted to 1\%. Independent of the couplings of the technifermions, we show
that the isospin-splitting of the top and bottom quarks implies that the
top-color gauge bosons must have masses larger than about 1.4 TeV. Our analysis
can also be applied to strong extended technicolor (ETC) models that produce
the top-bottom splitting via isospin breaking ETC interactions.


title: Quark Singlets: Implications and Constraints

abstract:
  Quarks whose left- and right-handed chiral components are both singlets with
respect to the SU(2) weak-isospin gauge group, offer interesting physics
possibilities beyond the Standard Model (SM) already studied in many contexts.
We here address some further aspects. We first collect and update the
constraints from present data on their masses and mixings with conventional
quarks. We discuss possible effects on $b\to s\gamma$ and $Z\to b\bar b$ decays
and give fresh illustrations of CP asymmetries in $B^0$ decays differing
dramatically from SM expectations. We analyse singlet effects in grand
unification scenarios: $d$-type singlets are most economically introduced in
${\bf 5+5^*}$ multiplets of $SU(5)$, with up to three generations, preserving
gauge coupling unification with perturbative values up to the GUT scale;
$u$-type singlets can arise in ${\bf 10+10^*}$ multiplets of $SU(5)$ with at
most one light generation. With extra matter multiplets the gauge couplings are
bigger; we give the two-loop evolution equations including exotic multiplets
and a possible extra $U(1)$ symmetry. Two-loop effects can become important,
threatening unification (modulo threshold effects), perturbativity and
asymptotic freedom of $\alpha_3$. In the Yukawa sector, top-quark fixed-point
behaviour is preserved and singlet-quark couplings have infrared fixed points
too, but unification of $b$ and $\tau$ couplings is not possible in a
three-generation $E_6$ model.


title: Quantum evolution of the disoriented chiral condensates

abstract:
  We study the dynamics of the chiral phase transition expected during the
expansion of the quark-gluon plasma produced in a high energy hadron or heavy
ion collision, using the $O(4)$ linear sigma model in the mean field
approximation. Imposing boost invariant initial conditions at an initial proper
time $\tau_0$ and starting from an approximate equilibrium configuration, we
investigate the possibility of formation of disoriented chiral condensate
during the expansion. In order to create large domains of disoriented chiral
condensates low-momentum instabilities have to last for long enough periods of
time. Our simulations show no instabilities for an initial thermal
configuration. For some of the out-of-equilibrium initial states studied, the
fluctuation in the number of particles with low transverse momenta become large
at late proper times.


title: Intrinsic Charm Contribution to Double Quarkonium Hadroproduction

abstract:
  Double $J/\psi$ production has been observed by the NA3 collaboration in $\pi
N$ and $p N$ collisions with a cross section of the order of 20-30 pb. The
$\psi \psi$ pairs measured in $\pi^- $ nucleus interactions at 150 and 280
GeV$/c$ are observed to carry an anomalously large fraction of the projectile
momentum in the laboratory frame, $x_{\psi \psi} \geq 0.6$ at 150 GeV$/c$ and
$\geq 0.4$ at 280 GeV$/c$. We postulate that these forward $\psi \psi$ pairs
are created by the materialization of Fock states in the projectile containing
two pairs of intrinsic $c \overline c$ quarks. We calculate the overlap of the
charmonium states with the $|\overline u d c \overline c c \overline c \rangle$
Fock state as described by the intrinsic charm model and find that the $\pi^- N
\rightarrow \psi \psi$ longitudinal momentum and invariant mass distributions
are both well reproduced. We also discuss double $J/\psi$ production in $pN$
interactions and the implications for other heavy quarkonium production
channels in QCD.


title:
QCD Mechanisms for Double Quarkonium and Open Heavy Meson
  Hadroproduction

abstract:
  Double $J/\psi$ production on the order of 20-30 pb has been observed by the
NA3 collaboration. These $\psi \psi$ pairs, measured in $\pi^- N$ interactions
at 150 and 280 GeV$/c$ and in $pN$ interactions at 400 GeV$/c$, carry a large
fraction of the projectile momentum, $x_{\psi \psi} \geq 0.6$ for the 150
GeV$/c$ beam and $\geq 0.4$ at 280 GeV$/c$. We examine several sources of $\psi
\psi$ pair production within QCD, including ${\cal O}(\alpha_s^4)$ $\psi \psi$
production, leading-twist $b \overline b$ production and decay, and the
materialization of heavy-quark Fock states in the projectile. We estimate the
production cross section and the single and double $J/\psi$ momentum and mass
distributions for each, comparing the results with the NA3 data, and predict
$\psi \psi$ production in $pN$ interactions at 800 GeV$/c$, accessible to
current fixed-target experiments. We also discuss the observable implications
of open heavy meson pair production from the intrinsic heavy quark Fock states.


title:
CALCULATION OF THE D AND B MESON LIFETIMES AND THE UNITARITY TRIANGLE
  PARAMETERS

abstract:
  Using the expansions of the heavy meson decay widths in the heavy quark mass
and QCD sum rules for estimates of corresponding matrix elements,\, we
calculate the $D^{\pm,o,s}$ and $B^{\pm,o,s}$ meson lifetimes. The results for
D mesons are in a reasonable agreement with the data,\, while it is predicted:
$[\Gamma (B_d)-\Gamma (B^\pm)]/\Gamma_B\se 4\%\,$ (and the lifetime difference
of the $B_d$ and $B_s$ mesons is even smaller);\,
$[\Gamma(B_s^{short})-\Gamma(B_s^{long})]/{\ov \Gamma}(B_s)\se 8\%\,.$ The role
of the weak annihilation and Pauli interference contributions to the lifetime
differences is described in detail. In the course of self-consistent
calculations the values of many parameters crucial for calculations with
charmed and beauty mesons are found. In particular,\, the quark pole masses
are: $M_c\se 1.65\,GeV,\,\, M_b\se 5.04\,GeV\,,$ and the decay constants are:
$f_D(M_c)\se 165\,MeV\,,\,\,f_B(M_b)\se 120\,MeV\,$. It is also shown that the
nonfactorizable corrections to the $B-{\bar B}$ mixing are large,\,
$B_B(M_b)\se (1-18\%)\,.$ The values of the unitarity triangle parameters are
found which are consistent with these results and the data available (except
for the NA31 result for the $\epsilon ^{\prime}/\epsilon$ which is too large):
$|V_{cb}|\se 4.2\cdot 10^{-2}\,,\, |V_{td}|\se 1.3\cdot 10^{-2}\,,\,
|V_{ub}/V_{cb}|\se 0.10\,,\, \{\,A\se 0.86\,,\,\,\rho \se -0.40\,,\,\, \eta \se
0.20\,\}.$


title: Renormalons and confinement

abstract:
  We compute the renormalon ambiguity of the static potential, in the limit of
a large number of flavors. An extrapolation of the QED result to QCD implies
that the large distance behavior of the quark potential is arbitrary in
perturbation theory, as there are an infinite number of prescriptions to
assign. The shape of the potential at large distances is not only affected by
the renormalon pole closest to the origin of the Borel plane, but a resummation
of all renormalon contributions is required. In particular, confinement can be
accommodated, but it is not explained. At short distances there is no
indication of a linear term in the potential.


title: Effects of the Gravitino on the Inflationary Universe

abstract:
  Gravitino problem is discussed in detail. We derive an upperbound on the
reheating temperature from the constraints of the big-bang nucleosynthesis and
the present mass density of the universe. Compared to previous works, we have
improve the following three points; (i) the gravitino production cross sections
are calculated by taking all the relevant terms in the supergravity lagrangian
into account, (ii) high energy photon spectrum is obtained by solving the
Boltzmann equations numerically, and (iii) the evolutions of the light elements
(D, T, $^3$He, $^4$He) at the temperature lower than $\sim$1MeV are calculated
by using modified Kawano's computer code.


title: A Remark on the $Z^0 \to b\bar b$ Width

abstract:
  The $Z^0 \to b\bar b$ width, $\Gamma_b$, is analysed in conjunction with the
total and hadronic $Z^0$ widths, $\Gamma_T$ and $\Gamma_h$. Assuming,
tentatively, that the present 2$\sigma$ discrepancy in $\Gamma_b$ will
substantiate as time goes on, for large values of $m_H$ it will be sufficient
to modify the $Z^0 b \bar b$ vertex only. In contrast, for small values of
$m_H$, the theoretical predictions for both the $Z^0$ width into light quarks
and leptons as well as the $Z^0 \to b\bar b$ vertex will have to be modified.


title: REAL-TIME DYNAMICS OF PARTON-HADRON CONVERSION

abstract:
  We propose a new and universal approach to the hadronization problem that
incorporates both perturbative QCD and effective field theory in their
respective domains of validity and that models the transition between them in
analogy to the finite temperature QCD phase transition. Using techniques of
quantum kinetic theory, we formulate a real-time description in momentum and
position space. The approach is applied to the evolution of fragmenting $q\bar
q$ and $gg$ jets as the system evolves from the initial 2-jet, via parton
multiplication and cluster formation, to the final yield of hadrons. We
investigate time scale of the transition, energy dependence, cluster size and
mass distributions, and compare our results for particle production and
Bose-Einstein correlations with experimental data for $e^+e^-\rightarrow
hadrons$. An interesting possibility to extract the space-time evolution of the
system from Bose enhancement measurements is suggested.


title: Top Quark Distributions in Hadronic Collisions

abstract:
  We present kinematical distributions for top quark pairs produced at the
Tevatron \ppbar\ Collider, as predicted within Next-to-Leading-Order QCD. We
consider single and double-inclusive distributions, and compare our results to
those obtained with the shower Monte Carlo HERWIG. We discuss the implications
of our findings for experimental issues such as the measurement of the top
quark mass.


title: The strong coupling, unification, and recent data

abstract:
  The prediction of the strong coupling assuming (supersymmetric) coupling
constant unification is reexamined. We find, using the new electroweak data,
$\alpha_{s}(M_{Z}) \approx 0.129 \pm 0.010$. The implications of the large
$\alpha_{s}$ value are discussed. The role played by the $Z$ beauty width is
stressed. It is also emphasized that high-energy (but not low-energy)
corrections could significantly diminish the prediction. However, unless
higher-dimension operators are assumed to be suppressed, at present one cannot
place strong constraints on the super-heavy spectrum. Non-leading electroweak
threshold corrections are also discussed.


title: "An SO(10) Solution to the Puzzle of Quark and Lepton Masses"

abstract:
  It is shown that almost all features of the quark and lepton masses can be
satisfactorily and simply explained without family symmetry, including the
threefold mass hierarchy among the generations, and the relations $m_{\tau}^0 =
m_b^0$, $m_{\mu}^0 = 3 m_s^0$, $m_e^0 = \frac{1}{3} m_d^0$, $m_u^0/m_t^0 <<
m_d^0/m_b^0$, $\tan \theta_c = \sqrt{m_d^0/m_s^0}$, $V_{cb} <<
\sqrt{m_s^0/m_b^0}$, and $V_{ub} \sim V_{cb}V_{us}$. Various aspects of the
group theory of $SO(10)$ play an essential role in explaining these relations.
The form of the mass matrices, rather than being imposed arbitrarily, emerges
naturally from a simple structure at the unification scale. This structure
involves only vector, spinor and adjoint representations. There are distinctive
and testable predictions for $\tan \beta$ and the neutrino mixing angles.


title: Top Quark Physics

abstract:
  In these three lectures, I review the physics of top quark. Each of the
lectures is self-contained.


title: Oscillons: Resonant Configurations During Bubble Collapse

abstract:
  Oscillons are localized, non-singular, time-dependent, spherically-symmetric
solutions of nonlinear scalar field theories which, although unstable, are
extremely long-lived. We show that they naturally appear during the collapse of
subcritical bubbles in models with symmetric and asymmetric double-well
potentials. By a combination of analytical and numerical work we explain
several of their properties, including the conditions for their existence,
their longevity, and their final demise. We discuss several contexts in which
we expect oscillons to be relevant. In particular, their nucleation during
cosmological phase transitions may have wide-ranging consequences.

categories: hep-ph astro-ph cond-mat nlin.PS patt-sol


title:
The Effects of Flavor Changing Neutral Current and
  Cabibbo-Kobayashi-Maskawa Matrix

abstract:
  We study the effects of tree-level flavor changing neutral current and its
present status with Cabibbo-Kobayashi-Maskawa matrix. Especially, we remark the
effects of flavor changing neutral current on the unitary triangle of
Cabibbo-Kobayashi-Maskawa matrix. In the case when the unitarity is nearly
conserved, we find that the allowed FCNC in the $db$ sector is $\left|
{{z_d}^{db}}/{{V_{CKM}}^{td} {{V_{CKM}}^{tb}}^\ast} \right| \sim O({10}^{-2})$,
from the evaluation of the present bounds for the mixing size of neutral $B$
meson ($x_d$), and the $CP$ violation parameter in the neutral $K$ meson
($\epsilon$). Although the size is small, the new physics due to the tree-level
FCNC in the $db$ sector is expected to be visible in the $B \rightarrow X_d \,
l^+ \, l^- $ and the $CP$ asymmetries in the neutral $B$ meson system. In the
case when the unitarity is violated and the quadrangle is conserved, the FCNC
is large enough, i.e. $\left| {{z_d}^{db}}/{{V_{CKM}}^{td}
{{V_{CKM}}^{tb}}^\ast} \right| \sim O(1)$. Then, a significant contribution is
also expected in the inclusive $B \rightarrow X_d \, \gamma$ decay.


title: Hadronic Weak Decays of Heavy Mesons and Nonfactorization

abstract:
  The parameters $\chi_{1,2}$, which measure nonfactorizable soft gluon
contributions to hadronic weak decays of mesons, are updated by extracting them
from the data of $D,\,B\to PP,~VP$ decays ($P$: pseudoscalar meson, $V$: vector
meson). It is found that $\chi_2$ ranges from $-0.36$ to $-0.60$ in the decays
from $D\to\bar{K}\pi$ to $D^+\to\phi\pi^+,~D\to\bar{K}^*\pi$, while it is of
order 10\% with a positive sign in $B\to\psi K,~D\pi,~D^*\pi,~D\rho$ decays.
Therefore, the effective parameter $a_2$ is process dependent in charm decay,
whereas it stays fairly stable in $B$ decay. This implies the picture that
nonfactorizable effects become stronger when the decay particles become less
energetic after hadronization. As for $D,\,B\to VV$ decays, the presence of
nonfactorizable terms in general prevents a possible definition of effective
$a_1$ and $a_2$. This is reenforced by the observation of a large longitudinal
polarization fraction in $B\to\psi K^*$ decay, implying $S$-wave dominated
nonfactorizable effects. The nonfactorizable term dominated by the $S$-wave is
also essential for understanding the decay rate of $B^-\to D^{*0} \rho^-$. It
is found that all nonfactorizable effects $A_1^{nf}/A_1^{BK^*},~A
_1^{nf}/A_1^{B\rho},~A_1^{nf}/A_1^{BD^*}$ ($nf$ standing for nonfactorization)
are positive and of order 10\%, in accordance with $\chi_2(B\to D(D^*)\pi(
\rho))$ and $\chi_2(B\to\psi K)$. However, we show that in $D\to\bar{K}^*\rho$
decay nonfactorizable effects cannot be dominated by the $S$-wave. A
polarization measurement in the color- and Cabibbo-suppressed decay mode
$D^+\to\phi\rho^+$ is strongly urged in order to test if $A_2^{nf}/A_2$ plays a
more pivotal role than $A_1^{nf}/A_1$ in charm decay.


title: Bound on nonlocal scale from LEP

abstract:
  Leptons, quarks and gauge bosons are assumed to be described by local field
theory. Stringent bounds on nonlocal scale can be derived from the high-
presision LEP measurements. We find a bound on nonlocal scale $\Lambda_{nl} >
1020\: Gev$, C.L.95\% from LEP data.


title:
DRELL-YAN PROCESSES AS A PROBE OF CHARGE SYMMETRY VIOLATION IN THE PION
  AND NUCLEON

abstract:
  We extend earlier investigations of charge symmetry violation in the valence
quark distributions of the nucleon, and make similar estimates for the pion.
The sensitivity of pion-induced Drell-Yan measurements to such effects is then
examined. It is shown that combinations of $\pi^+$ and $\pi^-$ data on
deuterium and hydrogen are sensitive to these violations, and that the pion and
nucleon charge symmetry violating terms separate as a function of $x_\pi$ and
$x_N$ respectively. We estimate the background terms which must be evaluated to
extract charge symmetry violation.


title:
NON-EQUILIBRIUM DESCRIPTION OF BREMSSTRAHLUNG IN DENSE MATTER (Landau -
  Pomeranchuk - Migdal Effect)

abstract:
  The soft behavior of the bremsstrahlung from a source is discussed in terms
of classical transport models and within a non--equilibrium quantum field
theory (Schwinger - Kadanoff - Baym - Keldysh) formulation.


title: Defect Production in Slow First Order Phase Transitions

abstract:
  We study the formation of vortices in a U(1) gauge theory following a
first-order transition proceeding by bubble nucleation, in particular the
effect of a low velocity of expansion of the bubble walls. To do this, we use a
two-dimensional model in which bubbles are nucleated at random points in a
plane and at random times and then expand at some velocity $v_{\rm b}<c$.
Within each bubble, the phase angle is assigned one of three discrete values.
When bubbles collide, magnetic `fluxons' appear: if the phases are different, a
fluxon--anti-fluxon pair is formed. These fluxons are eventually trapped in
three-bubble collisions when they may annihilate or form quantized vortices. We
study in particular the effect of changing the bubble expansion speed on the
vortex density and the extent of vortex--anti-vortex correlation.


title: Temperature dependence of heavy meson masses

abstract:
  Using a previously derived QCD effective hamiltonian we find the masses of
heavy quarkonia states. Non perturbative effects are included through
temperature dependent gluonic condensates. We find that even a moderate change
in these condensates in a hot hadronic environment (below the deconfining
transition) is sufficient to significantly change the heavy meson masses.


title: An Anti-WKB Approximation

abstract:
  In the WKB approximation the $\nabla^2S$ term in Schrodinger's equation is
subordinate to the |\nabla S|^2 term. Here we study an anti-WKB approximation
in which the $\nabla^2 S$ term dominates (after a guess for S is supplied). Our
approximation produces only the nodeless ground state wavefunction, but it can
be used in potential problems where the potential is not symmetric, and in
problems where there are many degrees of freedom. As a test, we apply the
method to potential problems, including the hydrogen and helium atoms and to
$\phi^4$ field theory.


title:
An introduction to the perturbative QCD pomeron and to jet physics at
  large rapidities

abstract:
  In these lectures we discuss the Balitsky, Fadin, Kuraev, and Lipatov (BFKL)
theory, which resums the leading logarithmic contributions to the radiative
corrections to parton scattering in the high-energy limit, and we apply it to
hadronic two-jet production at large rapidity intervals.


title: $(B+L)$-conserving Nucleon Decays in Supersymmetric Models

abstract:
  The presence of the $(B+L)$-conserving decay modes $n \to K^+ e^-,$ $n \to
K^+ \mu^-,$ $p \to K^+ e^- \pi^+$ and $p \to K^+ \mu^- \pi^+$ is shown to be a
characteristic feature of a class of models with explicit breaking of
$R$-parity. These modes dominate over the $(B-L)$-conserving ones in certain
regions of the parameter space; the impact of this scenario for nucleon decay
search at the Super-Kamiokande is discussed.


title: Non-decoupling of Heavy Neutrinos and Lepton Flavour Violation

abstract:
  We consider a class of models predicting new heavy neutral fermionic states,
whose mixing with the light neutrinos can be naturally significant and produce
observable effects below the threshold for their production. We update the
indirect limits on the flavour non-diagonal mixing parameters that can be
derived from unitarity, and show that significant rates are in general expected
for one-loop-induced rare processes due to the exchange of virtual heavy
neutrinos, involving the violation of the muon and electron lepton numbers. In
particular, the amplitudes for $\mu$--$e$ conversion in nuclei and for $\mu\to
ee^+e^-$ show a non-decoupling quadratic dependence on the heavy neutrino mass
$M$, while $\mu\to e\gamma$ is almost independent of the heavy scale above the
electroweak scale. These three processes are then used to set stringent
constraints on the flavour-violating mixing angles. In all the cases
considered, we point out explicitly that the non-decoupling behaviour is
strictly related to the spontaneous breaking of the SU(2) symmetry.


title: Do W_L and H form a p-wave bound state?

abstract:
  We examine the possibility of bound state formation in the W_L H --> W_L H
channel. The dynamical calculation using the N/D method indicates that when the
interactions among the Goldstone and Higgs bosons become sufficiently strong, a
p-wave state [I^G(J^P)=1^-(1^+)] may emerge.


title: Theory of a Strongly Interacting Electroweak Symmetry Breaking Sector

abstract:
  In this review we discuss theories of the electroweak symmetry breaking
sector in which the $W$ and $Z$ interactions become strong at an energy scale
not larger than a few TeV.


title:
Constraints on Z1-Z2 Mixing from the Decay $Z1 \to e-e+$ in the
  left-right Symmetric Model

abstract:
  We examine the decay of $Z_1$ in electrons with recent data from LEP. The
partial width $\Gamma(Z_1\to e^-e^+)$ is studied in the framework of a
left-right symmetric model with standard electroweak corrections. Processes
measured near the resonance has served to measure the neutral coupling
constants very precisely, which is useful to set bounds on the parameters of
the model. This partial decay occurs in the resonance zone. As a consecuence
the process is independent of the mass of the additional $Z_2$ heavy gauge
boson which appears in this kind of models and so we have the mixing angle $\f$
between the left and the right bosons as the only additional parameter. In this
paper we take advantage of this fact to set a bound for $\f$: $-9\times
10^{-3}\leq\f\leq 4\times 10^{-3}$, which is in agreement with other
constraints previously reported.


title: Improved Coulomb Correction Formulae for Bose-Einstein Correlations

abstract:
  We present improved Coulomb correction formulae for Bose-Einstein
correlations including also exchange term and use them to calculate appropriate
correction factors for several source functions. It is found that Coulomb
correction to the exchange function in the Bose-Einstein correlations cannot be
neglected.


title: Axino Mass in Supergravity Models

abstract:
  We analyze the mass of the axino, the fermionic superpartner of the axion, in
general supergravity models incorporating a Peccei--Quinn--symmetry and
determine the cosmological constraints on this mass. In particular, we derive a
simple criterion to identify models with an LSP--axino which has a mass of
$O(m_{3/2}^2/f_{PQ})=O($keV) and can serve as a candidate for (warm) dark
matter. We point out that such models have very special properties and in
addition, the small axino mass has to be protected against radiative
corrections by demanding small couplings in the Peccei--Quinn--sector.
Generically, we find an axino mass of order $m_{3/2}$. Such masses are
constrained by the requirement of an axino decay which occurs before the
decoupling of the ordinary LSP. Especially, for a large Peccei--Quinn--scale
$f_{PQ}>10^{11}$ GeV this constraint might be difficult to fulfill.


title: QCD SPECTRAL SUM RULES FOR HEAVY FLAVOURS

abstract:
  Recent developments in the uses of QCD spectral sum rules (QSSR) for heavy
flavours are summarized and updated. QSSR results are compared with the
existing data and with the ones from alternative approaches.


title: Wavelet correlations in hierarchical branching processes

abstract:
  A study of correlations in tractable multiparticle cascade models in terms of
wavelets reveals many promising features. The selfsimilar construction of the
wavelet basis functions and their multiscale localization properties provide a
new approach to the statistical analysis and analytical control of
hierarchically organized branching processes. The exact analytical solution of
several discrete models shows that the wavelet transformation supresses
redundancy in the correlation information. Wavelet correlations can be
naturally interpreted as correlations between structures (clumps) living on
different scales.


title: Factorization in One-Loop Gauge Theory

abstract:
  Factorization properties of one-loop gauge theory amplitudes have been used
as checks on explicitly computed amplitudes and in the construction of ansatze
for higher-point ones. In massless theories, such as QCD at high energies,
infrared divergences complicate factorization. Here we prove that factorization
in such theories is described by a set of universal functions. In particular, a
proof of the universality of one-loop splitting functions as the momenta of two
particles become collinear is presented. Factorization in multi-particle
channels is also given. The discontinuity functions that appear in the
splitting functions may also be used to obtain infrared divergent box integral
functions from finite ones.


title: On the Interpretation of $\pi N \to \pi \pi N$ Data near Threshold

abstract:
  Near threshold pion production experiments have been recently carried out and
used to extract S--wave $\pi\pi$ scattering lengths. We emphasize here that at
present these processes are related only at the tree level (and its first
correction) in chiral perturbation theory. Higher order corrections (including
loops) must be evaluated before rigorous claims concerning S--wave $\pi\pi$
scattering lengths can be made.


title: ONE LOOP QED VERTEX IN ANY COVARIANT GAUGE: ITS COMPLETE ANALYTIC FORM

abstract:
  The one loop vertex in QED is calculated in arbitrary covariant gauges as an
analytic function of its momenta. The vertex is decomposed into a longitudinal
part, that is fully responsible for ensuring the Ward and Ward-Takahashi
identities are satisfied, and a transverse part. The transverse part is
decomposed into 8 independent components each being separately free of
kinematic singularities in $\bf any$ covariant gauge in a basis that modifies
that proposed by Ball and Chiu. Analytic expressions for all 11 components of
the ${O(\alpha)}$ vertex are given explicitly in terms of elementary functions
and one Spence function. These results greatly simplify in particular kinematic
regimes.


title: The Minimal Quark-Lepton Symmetry Model and the Limit on Z'-mass

abstract:
  A minimal extension of the Standard Model containing the four-color
quark-lepton symmetry is proposed and discussed. The existence of a rather
light extra $Z'$-boson originated from the four-color quark-lepton symmetry is
shown to be compatible with the current electroweak data. The cross sections
$\sigma(e^+ e^- \rightarrow \gamma, Z, Z' \rightarrow \bar f f)$ are
calculated, and their deviations from the SM predictions are shown to be
significant at $\sqrt s \ge 200 GeV$ and available for the measurements at the
LEP200 and future colliders.


title: Quantum KAM Technique and Yang-Mills Quantum Mechanics

abstract:
  We study a quantum analogue of the iterative perturbation theory by
Kolmogorov used in the proof of the Kolmogorov-Arnold-Moser (KAM) theorem. The
method is based on sequent canonical transformations with a "running" coupling
constant $ \lm,\lm^{2},\lm^{4} $ etc. The proposed scheme, as its classical
predecessor, is "superconvergent" in the sense that after the n-th step, a
theory is solved to the accuracy of order $ \lm^{2^{n-1}} $. It is shown that
the Kolmogorov technique corresponds to an infinite resummation of the usual
perturbative series. The corresponding expansion is convergent for the quantum
anharmonic oscillator due to the fact that it turns out to be identical to the
Pade series. The method is easily generalizable to many-dimensional cases. The
Kolmogorov technique is further applied to a non-perturbative treatment of
Yang-Mills quantum mechanics. A controllable expansion for the wave function
near the origin is constructed. For large fields, we build an asymptotic
adiabatic expansion in inverse powers of the field. This asymptotic solution
contains arbitrary constants which are not fixed by the boundary conditions at
infinity. To find them, we approximately match the two expansions in an
intermediate region. We also discuss some analogies between this problem and
the method of QCD sum rules.


title:
On the strange vector form factors of the nucleon in the NJL soliton
  model

abstract:
  Within the Nambu--Jona--Lasinio model strange degrees of freedom are
incorporated into the soliton picture using the collective approach of Yabu and
Ando. The form factors of the nucleon associated with the nonet vector current
are extracted. The numerical results provide limits for the strange magnetic
moment: $-0.05\le\mu_s\le0.25$. For the strange magnetic form factor of the
nucleon the valence quark and vacuum contributions add coherently while there
are significant cancellations for the strange electric form factor.


title: SLC/LEP CONSTRAINTS ON UNIFIED MODELS

abstract:
  We examine the potential of constraining possible nondecoupling effects of
heavy neutrinos and Higgs bosons at LEP and SLC that may show up in the
nonoblique part of the $Zl_il_j$ couplings. We analyze this type of new-physics
interactions within the context of low-energy scenarios motivated by unified
theories, such as the Standard Model (SM) with neutral isosinglets, the
left-right symmetric model, and the minimal supersymmetric SM. Our analysis
comprises a complete set of physical quantities based on the nonobservation of
flavour-violating $Z$-boson decays, lepton universality in the decays $Z\to
l\bar{l}$, and universality of lepton asymmetries at the $Z$ peak. It is found
that these quantities form a set of complementary observables and may hence
constrain the parameter space of the theories. Non-SM contributions of
new-physics interactions to $R_b=\Gamma(Z\to b\bar{b})/\Gamma(Z\to
\mbox{hadrons})$ are briefly discussed within these models.


title: Threshold Behaviour in Gauge Boson Pair Production at LEP 2

abstract:
  We discuss the form of the amplitude for gauge boson pair production at or
near threshold.We show that in the case of W-pair production at LEP2 near
threshold only one anomalous electromagnetic coupling can contribute. This
anomalous coupling is CP violating and contributes to the electric dipole
moment of the $W$. Since this coupling is likely to be small, it is important
to look for ZZgamma couplings in Zgamma production. These couplings are not
suppressed at the W-threshold.


title:
Finite temperature formalism for nonabelian gauge theories in the
  physical phase space

abstract:
  We establish a new framework of finite temperature field theory for
Yang-Mills theories in the physical phase space eliminating all unphysical
degrees of freedoms. Relating our method to the imaginary time formalism of
James and Landshoff in temporal axial gauge, we calculate the two-loop pressure
and provide a systematic and unique method to construct the additional vertices
encountered in their approach.


title: Dynamical Supersymmetry Breaking in Supergravity Theories

abstract:
  In rigid supersymmetry, generic models of dynamical supersymmetry breaking
contain a light Goldstone boson, called the R axion. We show that supergravity
effects explicitly break the R symmetry and give mass to the R axion. For
visible and renormalizable hidden sector models, the massive R axion is free
from astrophysical and cosmological problems. For nonrenormalizable hidden
sector models, the R axion suffers from cosmological difficulties similar to
those of the moduli fields in string theory.


title: GAUGE INVARIANCE AND ANOMALOUS GAUGE BOSON COUPLINGS

abstract:
  Using the S--matrix pinch technique we obtain to one loop order, gauge
independent $\gamma W^-W^+$ and $Z W^-W^+$ vertices in the context of the
standard model, with all incoming momenta off--shell. We show that the vertices
so constructed satisfy simple QED--like Ward identities. These gauge invariant
vertices give rise to expressions for the magnetic dipole and electric
quadrupole form factors of the W gauge boson, which, unlike previous
treatments, satisfy the crucial properties of infrared finiteness and
perturbative unitarity.


title: Effective Supergravity from 4-d Fermionic Strings

abstract:
  The untwisted moduli in four-dimensional fermionic string models are
identified by considering world-sheet Abelian Thirring interactions. The full
Kahler potentials of untwisted sector fields are given for a restricted class
of models.


title:
Some constraints on neutral heavy leptons from flavor-conserving decays
  of the Z boson

abstract:
  Small neutrino masses can arise in some grand unified models or superstring
theories. We consider a model with an enhanced fermion sector containing Dirac
neutral heavy leptons. The dependence on the mass and mixing parameters of
these new fermions is investigated for several measurable quantities. We study
the flavor-conserving leptonic decays of the Z boson and universality breaking
in these decays. We also consider the W boson mass dependence on neutral heavy
lepton parameters.


title: Instanton Effects in $N\bar N$ Annihilation

abstract:
  It is shown that specific spin-flavour properties of the nonperturbative
interaction between quarks induced by instantons allow us to explain the
peculiarities of the OZI rule violation in $N \bar N$ annihilation. New
experiments to test the instanton mechanism of the OZI rule violation are
proposed.


title: Hadroproduction of Charmonium at Large $x_F$

abstract:
  We present a higher-twist production mechanism for $\eta_c$ and $\chi_J$
charmonium at large momentum fraction $x_F$ in pion-nucleon collisions. The
higher-twist contribution is essentially independent of $x_F$ and therefore
becomes dominant at large $x_F$, where the leading-twist contribution falls off
as $(1-x_F)^3$. We show that the higher-twist mechanism produces longitudinally
polarized $\chi_1$ and $\chi_2$. For the $\chi_2$, this is clearly different
from the leading-twist prediction of transverse polarization. For the $\chi_1$,
the polarization of the leading- and higher-twist contributions is
qualitatively similar.


title:
Charged Higgs Boson Search at the Tevatron Upgrade Using Tau
  Polarization

abstract:
  We explore the prospect of charged Higgs boson search in top quark decay at
the Tevatron collider upgrade, taking advantage of the opposite states of
$\tau$ polarization resulting from the $H^\pm$ and $W^\pm$ decays. Methods of
distinguishing the two contributions in the inclusive 1-prong hadronic decay
channel of $\tau$ are suggested. The resulting signature and discovery limit of
$H^\pm$ are presented for the Tevatron upgrade as well as the Tevatron$^\star$
and the Ditevatron options.


title: The Resolving Power of a Reaction

abstract:
  We describe a simple method to compute the Cramer-Rao limit of a high energy
experiment, i.e., the smallest error with which a parameter can in principle be
determined in a reaction. This precision remains a theoretical paradigm since
it assumes perfect experimental conditions. Nevertheless, it is shown at hand
of an example that for simple processes this asymptotic resolving power can be
approached very closely. In all situations, the procedure is at least a useful
test of what could and what cannot be measured by studying a particular
reaction.


title:
$\eta \to \pi^{0} \gamma \gamma$ and $\gamma \gamma \to \pi^{0} \pi^{0}$
  in $O(p^{6})$ chiral perturbation theory

abstract:
  $\eta \rightarrow \pi^{0} \gamma \gamma$ and $\ggpipi$ are considered in
$O(p^{6})$ chiral perturbation theory. In addition to the usual $\rho,\omega$
contributions, there are two $O(p^{6})$ operators (${\cal L}_{6,m}$) arising
from explicit chiral symmetry breaking. Since only one of the two operators
contributes to $\etapigg$, the coefficient of this operator ($\equiv d_3$) can
be determined in two ways : (i) from the measured decay rate of $\eta
\rightarrow \pi^{0} \gamma \gamma$, and (ii) by assuming the resonance
saturations of the low energy coefficients in the $O(p^{6})$ chiral lagrangian.
We find that two methods lead to vastly different values of $d_3$, which would
indicate that either the measured decay rate for $\eta \rightarrow \pi^{0}
\gamma \gamma$ is too large by a factor of $2 \sim 3$, or the resonance
saturation assumptions do not work for $d_3$.


title: Formation and Evolution of Quark-Gluon Plasma at RHIC and LHC

abstract:
  Initial conditions for quark-gluon plasma formation at $\tau=0.1\fm$ are
considered in lowest order perturbative QCD. Chemical composition,
thermalization of the formed semihard quark-gluon system and especially
implications of the new HERA parton distributions with the enhancement at small
$x$ are studied. The plasma at $\tau=0.1\fm$ is shown to be strongly gluon
dominated both at RHIC and LHC, and a possibility for rapid thermalization of
gluons at LHC is pointed out. Uncertainties in the calculations, particularly
shadowing corrections to the parton distributions, are discussed. Free
streaming and ideal hydro limits for the evolution of the gluonic plasma with
the calculated minijet initial conditions are demonstrated, and a lower limit
for final multiplicities obtained for the LHC nuclear collisions.


title:
THE SUPERSYMMETRIC SINGLET MAJORON MODEL AND THE GENERAL UPPER BOUND ON
  THE LIGHTEST HIGGS BOSON MASS

abstract:
  An upper bound on the tree-level mass of the lightest Higgs boson of the
Supersymmetric Singlet Majoron Model is obtained. Contrary to some recent
claims, it is shown to be of the same form as the general mass bound previously
calculated for supersymmetric models with an extended Higgs sector.
Soft-breaking masses or exotic vacuum expectation values do not enter in the
tree-level bound [which is only controlled by the electroweak scale (M_Z)] and
also decouple from the most important radiative corrections to the bound (the
ones coming from the top-stop sector). The derivation of the upper bound for
general Supersymmetric Models is reviewed in order to clarify its range of
applicability.


title: About the modern "experimental value" of W boson width.

abstract:
  It is shown that the methods which have been used up to now to determine the
$W$ width from the $p\bar p$ data confirm the SM predictions for some
combinations of various phenomenological parameters, however, they do not give
an independent value for the $W$ width. Moreover, the accuracy that could be
achieved in future experimental checks of SM predictions for such quantities is
limited by effects which require detailed theoretical study.


title: BEYOND THE STANDARD MODEL WITH EFFECTIVE LAGRANGIANS

abstract:
  We discuss some applications of the effective quantum field theory to the
description of the physics beyond the Standard Model. We consider two different
examples. In the first one we derive, at the one-loop level, an effective
lagrangian for an extension of the Standard Model with a charged scalar singlet
by ``integrating out'' the heavy scalar. In the second example we illustrate
the use of general effective theories at the loop level.


title: Physics Goals of a $\mu^+\mu^-$ Collider

abstract:
  This working group report focuses on the physics potential of $\mu^+\mu^-$
colliders beyond what can be accomplished at linear $e^+e^-$ colliders and the
LHC. Particularly interesting possibilities include (i)~$s$-channel resonance
production to discover and study heavy Higgs bosons with $ZZ$ and $WW$
couplings that are suppressed or absent at tree-level (such as the $H$ and $A$
Higgs bosons of supersymmetric models), (ii)~study of the strongly interacting
electroweak sector, where higher energies give larger signals, and
(iii)~measurements of the masses and properties of heavy supersymmetric
particles.


title: INFLATION VERSUS THE COSMOLOGICAL MODULI PROBLEM

abstract:
  We show that in generic supergravity theories the mass of the moduli during
inflation is larger (or at least of the same order of magnitude) than the
Hubble constant. This fact does not depends on the details of the inflation and
on the value of the Hubble parameter during it. The reason is that inflationary
universe is dominated by large F-term (or D-term) density which is higher than
the SUSY breaking scale in the present minimum and stabilizes the flat
directions of the supersymmetric vacua. Therefore, in general even standard
inflationary scenarios (with large H) may solve the cosmological moduli
problem.


title: Weak Decays in the light--front Quark Model

abstract:
  We study the form factors of heavy--to--heavy and heavy--to--light weak
decays using the light--front relativistic quark model. For the
heavy--to--heavy $B \ra D^{(\ast)}$ semileptonic decays we calculate the
corresponding Isgur--Wise function for the whole kinematic region. For the
heavy--to--light $B\ra P$ and $B\ra V$ semileptonic decays we calculate the
form factors at $q^2 = 0$; in particular, we have derived the dependence of the
form factors on the $b$--quark mass in the $m_b \ra \infty$ limit. This
dependence can not be produced by extrapolating the scaling behavior of the
form factors at $q^2_{max}$ using the single--pole assumption. This shows that
the $q^2$ dependence of the form factors in regions far away from the
zero--recoil could be much more complicated than that predicted by the
single--pole assumption.


title: EFFICIENT ANALYTIC COMPUTATION OF HIGHER-ORDER QCD AMPLITUDES

abstract:
  We review techniques simplifying the analytic calculation of one-loop QCD
amplitudes with many external legs, for use in next-to-leading-order
corrections to multi-jet processes. Particularly useful are the constraints
imposed by perturbative unitarity, collinear singularities and a
supersymmetry-inspired organization of helicity amplitudes. Certain sequences
of one-loop helicity amplitudes with an arbitrary number of external gluons
have been obtained using these constraints.


title: Rare Decays, CP Violation and QCD

abstract:
  We discuss several aspects of rare decays and CP violation in the standard
model including the impact of the recent top quark discovery. In particular we
review the present status of next-to-leading QCD calculations in this field
stressing their importance in the determination of the parameters in the
Cabibbo-Kobayashi-Maskawa matrix. We emphasize that the definitive tests of the
standard model picture of rare decays and CP violation will come through a {\it
simultaneous} study of CP asymmetries in $B_{d,s}^0$ decays, the rare decays
$K^+ \to \pi^+\nu \bar\nu$ and $K_L \to \pi^0\nu\bar\nu$, and $(B^0_d-\bar
B^0_d)/(B^0_s-\bar B^0_s)$.


title:
D- and \tau-Decays: Placing New Bounds on R-Parity--Violating
  Supersymmetric Couplings

abstract:
  $D$- and $\tau$-decays are used to place bounds on some $R$-parity--violating
$\lambda'$-type Yukawa interactions. Some of these bounds are competitive with
the existing ones, some are improved while some are new.


title:
New LEP constraints on some supersymmetric Yukawa interactions that
  violate R-parity

abstract:
  We consider one-loop corrections to partial widths of the $Z$ induced by
supersymmetric Yukawa interactions that violate $R$-parity. The precise
experimental values of the leptonic $Z$ partial widths bound these Yukawa
couplings, with the most interesting constraints being those on couplings
involving the $\tau$, since previous constraints on them were very mild.


title:
Helicity probabilities for heavy quark fragmentation into heavy-light
  excited mesons

abstract:
  After a brief review on how heavy quark symmetry constraints the helicity
fragmentation probabilities for a heavy quark hadronizes into heavy-light
hadrons, we present a heavy quark fragmentation model to extract the value for
the Falk-Peskin probability $w_{3/2}$ describing the fragmentation of a heavy
quark into a heavy-light meson whose light degrees of freedom have angular
momentum ${3 \over 2}$. We point out that this probability depends on the
longitudinal momentum fraction $z$ of the meson and on its transverse momentum
$p_\bot$ relative to the jet axis. In this model, the light degrees of freedom
prefer to have their angular momentum aligned transverse to, rather than along,
the jet axis. Implications for the production of excited heavy mesons, like
$D^{**}$ and $B^{**}$, are briefly discussed.


title:
THE GLUON DISTRIBUTION AT SMALL x OBTAINED FROM A UNIFIED EVOLUTION
  EQUATION.

abstract:
  We solve a unified integral equation to obtain the $x, Q_T$ and $Q$
dependence of the gluon distribution of a proton in the small $x$ regime; where
$x$ and $Q_T$ are the longitudinal momentum fraction and the transverse
momentum of the gluon probed at a scale $Q$. The equation generates a gluon
with a steep $x^{- \lambda}$ behaviour, with $\lambda \sim 0.5$, and a $Q_T$
distribution which broadens as $x$ decreases. We compare our solutions with, on
the one hand, those that we obtain using the double-leading-logarithm
approximation to Altarelli-Parisi evolution and, on the other hand, to those
that we determine from the BFKL equation.


title:
Real-time quantum field theory at finite temperature in an inhomogeneous
  media

abstract:
  The method of the real time perturbative calculations of nonequilibrium
averages is generalised to the case of varying chemical potential. Calculations
are performed in the frame of Zubarev's nonequilibrium density matrix approach.
In this approach perturbations of temperature and other thermodynamical
parameters are taken into account explicitly including nonlinear terms. It
differs from the Schwinger-Keldysh approach through the choice of more general
initial conditions for the density matrix.


title:
Gauge Invariant Variables for Spontaneously Broken SU(2) Gauge Theory in
  the Spherical Ansatz

abstract:
  We describe classical solutions to the Minkowski space equations of motion of
SU(2) gauge theory coupled to a Higgs field in the spatial spherical ansatz. We
show how to reduce the equations to four equations for four gauge invariant
degrees of freedom which correspond to the massive gauge bosons and the Higgs
particle. The solutions typically dissipate at very early and late times. To
describe the solutions at early and late times, we linearize and decouple the
equations of motion, all the while working only with gauge invariant variables.
We express the change in Higgs winding of a solution in terms of gauge
invariant variables.


title:
A HIGGS-FREE MODEL FOR FUNDAMENTAL INTERACTIONS. Part I: Formulation of
  the Model

abstract:
  We show that the local conformal group $C$ is a natural symmetry group of
strong, electroweak and gravitational interactions. A model for these
interactions invariant under the local symmetry group $G=SU(3)\times
SU(2)_{L}\times U(1)\times C$ is postulated. It contains all Standard Model and
gravitational fields, however the Higgs mass term $\mu^2\Phi^{\dagger}\Phi$ is
forbidden. Using the unitary gauge and the conformal scale fixing conditions we
can eliminate all four real components of the Higgs field in this model. In
spite of that the tree level masses of vector mesons, leptons and quarks are
automatically generated and they are given by the same formulas as in the
conventional Standard Model. The gravitational sector of the model is also
analyzed and it is shown that the model admits in the classical limit the
Einsteinian form of gravitational interactions. We propose several experimental
tests which can discriminate between the Higgs-Free and the Standard Models.


title:
A HIGGS-FREE MODEL FOR FUNDAMENTAL INTERACTIONS. Part II: Predictions
  for Electroweak Observables

abstract:
  The predictions for electroweak observables following from Higgs-Free Model
for Fundamental Interactions are derived. It is shown that these predictions
are close to the Standard Model predictions and they are in a surprising
agreement with the experimental data. The analysis of electroweak observables
at low and high energy suggests that the Higgs mass $m_H$ is just the
ultraviolet cutoff which increases if the process energy scale increases. We
propose several experimental tests which can discriminate between the Standard
and the Higgs-Free Models.


title:
SIGNALS FOR MINIMAL SUPERGRAVITY AT THE CERN LARGE HADRON COLLIDER:
  MULTI-JET PLUS MISSING ENERGY CHANNEL,

abstract:
  We use ISAJET to perform a detailed study of the missing transverse energy
$\eslt$ plus multi-jet signal expected from superparticle production at the
CERN LHC. Our analysis is performed within the framework of the minimal
supergravity model with gauge coupling unification and radiative electroweak
symmetry breaking. We delineate the region of parameter space where the $\eslt$
supersymmetry signal should be observable at the LHC and compare it to the
regions explorable via searches for sleptons and for chargino/neutralino
production. We confirm that, given a data sample of 10~$\fb^{-1}$, $m_{\tg}\sim
1300$ GeV can be explored if $m_{\tq}\gg m_{\tg}$, while $m_{\tg}\sim 2000$ GeV
can be probed if $m_{\tq}\simeq m_{\tg}$. We further examine what information
can be gleaned from scrutinizing this event sample. For instance, the multi-jet
multiplicity yields information on whether squark production makes a
significant contribution to the observed $\eslt$ sample. Furthermore,
reconstructing hemispheric masses may yield a measure of $m_{\tg}$ to $\sim
15-25\%$. Finally, for favourable ranges of parameters, by reconstructing
masses of tagged $b\bar{b}$ jet pairs, it may be possible to detect Higgs
bosons produced via sparticle cascade decay chains.


title: Inclusive Decays of Heavy Flavours

abstract:
  Recent progress in the theoretical description of inclusive heavy flavour
decays is reviewed. After an outline of the theoretical methods applications to
total decay rates and semileptonic decay spectra are presented.


title:
The Nonresonant Cabibbo Suppressed Decay $B^\pm\to \pi^+\pi^-\pi^\pm$
  and Signal for CP Violation

abstract:
  We consider various contributions to the nonresonant decay $B^\pm\rightarrow
\pi^+\pi^-\pi^\pm$, both of the long-distance and short-distance types with the
former providing for most of the branching ratio, predicted to be
$BR(B^\pm\rightarrow \pi^+\pi^-\pi^\pm) = (1.5 - 8.4 )\times 10^{-5}$. We also
discuss an application to CP violation resulting from the interference of that
nonresonant background (with $m(\pi^+\pi^-)\approx 3.4$ GeV) and
$B^\pm\rightarrow \chi_{c0} \pi^\pm$ followed by $\chi_{c0}\rightarrow
\pi^+\pi^-$. The resulting value of the partial rate asymmetry is $(0.40\sim
0.48)\mbox{sin}\gamma$, where $\gamma = \mbox{arg}(V_{ub}^*)$.


title:
Dynamical Generation of CKM Mixings by Broken Horizontal Gauge
  Interactions

abstract:
  The fermion mass matrices are calculated in the framework of the dynamical
mass generation by the broken horizontal gauge interactions. The
non-proportional mass spectra between up- and down-sectors and CKM mixings are
obtained solely by radiative corrections due to the ordinary gauge
interactions.


title:
Spin content of constituent quarks and one-spin asymmetries in inclusive
  processes

abstract:
  We consider mechanism for one-spin asymmetries observed in inclusive hadron
production. The main role belongs to the orbital angular momentum of the
quark-antiquark cloud in the internal structure of constituent quarks. We argue
that the origin of the asymmetries in pion production is a result of retaining
of this internal angular orbital momentum by the perturbative phase of QCD
under transition from the non-perturbative phase. The non-perturbative hadron
structure is based on the results of chiral quark models. PACS number(s):
11.30.Qc, 12.40.Pp, 13.75.Ni, 13.88.+e


title:
On the determination of the trilinear boson couplings in e^-e^+ -->
  lepton anti-neutrino quark anti-quark at LEPII

abstract:
  We present the full tree-order calculation of the process
$e^+e^-\to\ell\bar{\nu}_\ell\; q \bqp$ including the width effects in a way
which is consistent with gauge invariance and high energy unitarity and which
has a natural interpretation within standard perturbation theory. We also
include C- and P-preserving deviations from Standard Model trilinear vector
boson couplings. An analysis of the sensitivity of these channels on the
trilinear couplings, using well measured angular variables of the four fermion
final state, is also presented.


title: Estimates of $\epsilon\prime/\epsilon$

abstract:
  We review the latest calculations of the next-to-leading $\DSone$ effective
Hamiltonian, relevant for $K\to \pi\pi$ transitions. Numerical results for the
Wilson coefficients are given for different regularization schemes. Predictions
of $\epse$, obtained using different approaches to evaluate the relevant
hadronic matrix elements, are compared. Given the present value of the top
mass, $m_t=(174\pm 17)$ GeV, all the analyses, in spite of the large
theoretical uncertainties, indicate that the value of $\epse$ is smaller than
$1\times 10^{-3}$.


title: Electroweak Penguin Effects In Some $B_s^0$ Two-Body Decays

abstract:
  Using the next-to-leading order low energy effective Hamiltonian for $\Delta
B=1$ transitions, the effects of electroweak penguin operators in some two-body
decay modes of $B_s^0$ meson are estimated in the Standard Model (SM). We find
that in $B_s^0\to\pi^+ K^-$ and $B_s^0\to K^+K^-$ decay modes, the electroweak
penguin effects are small, while in $B_s^0\to\pi^0\bar{K^0}$, $\phi\bar{K^0}$,
$\phi\phi$, the electroweak penguin operators enhance or reduce the pure QCD
penguin and tree level contributions by $20%\sim 80%$ in decay width. We also
present the results of CP asymmetries in these $B_s^0$ deacy modes.


title: Eliminating the Hadronic Uncertainty

abstract:
  The Standard Model Lagrangian requires the values of the fermion masses, the
Higgs mass and three other experimentally well-measured quantities as input in
order to become predictive. These are typically taken to be $\alpha$, $G_\mu$
and $M_Z$. Using the first of these, however, introduces a hadronic
contribution that leads to a significant error. If a quantity could be found
that was measured at high energy with sufficient precision then it could be
used to replace $\alpha$ as input. The level of precision required for this to
happen is given for a number of precisely-measured observables. The $W$ boson
mass must be measured with an error of $\pm13$\,MeV, $\Gamma_Z$ to $0.7$\,MeV
and polarization asymmetry, $A_{LR}$, to $\pm0.002$ that would seem to be the
most promising candidate. The r\^ole of renormalized parameters in perturbative
calculations is reviewed and the value for the electromagnetic coupling
constant in the $\overline{\rm MS}$ renormalization scheme that is consistent
with all experimental data is obtained to be $\alpha^{-1}_{\overline{\rm
MS}}(M^2_Z)=128.17$.


title:
CompHEP - Specialized package for automatic calculations of elementary
  particle decays and collisions

abstract:
  At present time when a new generation of TeV colliders are beginning to
operate one needs to calculate cross-sections for a great number of various
reactions. Such calculations are united in the framework of the collider
physical program, providing definite predictions how to detect the signatures
of the new physics and separate them from the background.
  The CompHEP package was created for calculation of decay and high energy
collision processes of elementary particles in the lowest order (tree)
approximation. The main idea put into the CompHEP was to make available passing
from the lagrangian to the final distributions effectively with the high level
of automatization what is extremely needed in collider physics.


title:
Deconfinement transition in a one-dimensional model at finite
  temperature

abstract:
  We present a model for quark matter with a density dependent quark-quark
(confining) potential, which allows to describe a deconfinement phase
transition as the system evolves from a low density assembly of bound
structures to a high density free Fermi gas of quarks. A proper account of the
many-body correlations induced by the medium is crucial in order to disentangle
this behaviour, which does not uniquely stem from the the naive density
dependence of the interaction. We focus here on the effects of finite
(non-zero) temperatures on the dynamical behaviour of the system. In particular
we investigate the ground state energy per particle and the pair correlation
function, from which one can extract the relevant information about the quarks
being confined or not; the temperature dependence of the transition density is
also derived.


title: High Temperature Phase Transition in Two-Scalar Theories

abstract:
  Two-scalar theories at high temperature exhibit a rich spectrum of possible
critical behaviour, with a second or first order phase transition. In the
vicinity of the critical temperature one can observe critical exponents,
tricritical points and crossover behaviour. None of these phenomena are visible
to high temperature perturbation theory.


title: Radiative $b$ Decays and the Detection of Supersymmetric Dark Matter

abstract:
  The upper bond on the branching ratio for $b\to s\gamma$ decays implies a
stringent lower bound on the mass of the pseudoscalar Higgs boson of the MSSM
if sparticles are heavy. This leads to an upper bound on the expected event
rate in experiments searching for heavy supersymmetric dark matter. Scenarios
with lighter sparticle spectrum and light pseudoscalar Higgs boson are still
possible, but only if $\mu < 0$, which again implies a small LSP counting rate.