title:
Photo-production of Nucleon Resonances and Nucleon Spin Structure
  Function in the Resonance Region

abstract:
  The photo-production of nucleon resonances is calculated based on a chiral
constituent quark model including both relativistic corrections H{rel} and
two-body exchange currents, and it is shown that these effects play an
important role. We also calculate the first moment of the nucleon spin
structure function g1 (x,Q^2) in the resonance region, and obtain a
sign-changing point around Q^2 ~ 0.27 {GeV}^2 for the proton.


title:
Is right-handed neutrino degeneracy compatible with the solar and
  atmospheric neutrino data?

abstract:
  In light of the recent solar and atmospheric neutrino data, we investigate
the possibility of having an exactly degenerate spectrum for heavy right-handed
Majorana neutrinos at the grand unification scale. The analysis is performed in
the context of the minimal supersymmetric standard model with unbroken R-parity
and extended with three heavy Majorana neutrino fields in order to implement
the seesaw mechanism. In the absence of a Dirac-type leptonic mixing, the only
source of lepton flavour violation is the right-handed neutrino sector.
Inspired by GUT-motivated relations among the quark, charged-lepton and Dirac
neutrino Yukawa coupling matrices, and after the inclusion of the radiative
effects, we determine the effective neutrino mass matrix at the electroweak
scale. Using then the latest global analyses of the solar and atmospheric data
at 99% C.L., we conclude that, within this framework, the only solar solutions
compatible with the experimental data are the LOW and LMA solutions, being the
latter the most favoured one. At 90% C.L., only the LMA solution is allowed.


title:
Hidden symmetry and separation of variables in the problem of two
  centres with a confinement-type potential

abstract:
  An additional spheroidal integral of motion and a group of dynamic symmetry
in a model quantum-mechanical problem of two centres eZ_{1}Z_{2}omega with
Coulomb and oscillator interactions is obtained, the group properties of its
solutions being studied. P(3) \otimes P(2,1), P(5,1) and P(4,2) groups are
considered as the dynamic symmetry groups of the problem, among them P(3)
\otimes P(2,1) group possessing the smallest number of parameters. The obtained
results may appear useful at the calcuations of QQq-baryons and QQg-mesons
energy spectra.


title: Spin effects in deeply virtual Compton scattering

abstract:
  We consider the azimuthal angle dependence in the cross section of the hard
leptoproduction of a photon on a nucleon target. We show that this dependence
allows to define observables that isolate the twist-two and twist-three sectors
in the deeply virtual Compton scattering amplitude. All twist-two and
twist-three Compton form factors can be extracted from measurements of the
charge odd part of the polarized cross section and give access to all
generalized parton distributions.


title: Heavy Quark Production in the Semihard QCD Approach at HERA and Beyond

abstract:
  Processes of heavy quark production at HERA, TEVATRON and THERA energies are
considered using the semihard ($k_T$ factorization) QCD approach with emphasis
on the BFKL dynamics of gluon distributions.


title: $\pi K$ sum rules and the SU(3) chiral expansion

abstract:
  A recently proposed set of sum rules, based on the pion-Kaon scattering
amplitudes and their crossing-symmetric conjugates are analysed in detail. A
key role is played by the $l=0$ $\pi\pi\to K\overline K$ amplitude which
requires an extrapolation to be performed. It is shown how this is tightly
constrained from analyticity, chiral counting and the available experimental
data, and its stability is tested. A re-evaluation of the $O(p^4)$ chiral
couplings $L_1$, $L_2$, $L_3$ is obtained, as well as a new evaluation of the
large $N_c$ suppressed coupling $L_4$.


title: Non-perturbative effects in e^+e^- event-shape variables

abstract:
  We review theoretical methods employed to study non-perturbative
contributions to e^+e^- event-shapes and discuss their phenomenological
relevance.


title: Vacuum mimicking phenomena in neutrino oscillations

abstract:
  It is shown generally that any oscillation probability in matter with
approximately constant density coincides with that in vacuum to the first two
nontrivial orders in $\Delta m^2_{jk}L/E$ if $|\Delta m^2_{jk}L/E|\ll 1$ and
$|G_F N_e L|\ll 1$ are satisfied.


title:
Bounds on the Higgs-Boson Mass in the Presence of Non-Standard
  Interactions

abstract:
  The triviality and vacuum stability bounds on the Higgs-boson mass are
revisited in the presence of new interactions parameterized in a
model-independent way by an effective lagrangian. When the scale of new physics
is below 50 TeV the triviality bound is unchanged but the stability lower bound
is increased by 40-60 GeV. Should the Higgs-boson mass be close to its current
lower experimental limit, this leads to the possibility of new physics at the
scale of a few TeV, even for modest values of the effective lagrangian
parameters.


title: Neutrino Oscillations in Caianiello's Quantum Geometry Model

abstract:
  Neutrino flavor oscillations are analyzed in the framework of Quantum
Geometry model proposed by Caianiello. In particular, we analyze the
consequences of the model for accelerated neutrino particles which experience
an effective Schwarzschild geometry modified by the existence of an upper limit
on the acceleration, which implies a violation of the equivalence principle. We
find a shift of quantum mechanical phase of neutrino oscillations, which
depends on the energy of neutrinos as E^3. Implications on atmospheric and
solar neutrinos are discussed.


title: Feynman's derivation of Maxwell equations and extra dimensions

abstract:
  It is shown that Feynman's derivation of Maxwell equations admits a
generalization to the case of extra spatial dimensions. The generalization is
unique and is only possible in seven dimensional space.


title: Susceptibilities to order $\alpha_s$ in the high density phase of QCD

abstract:
  We compute the free energy density of QCD to order $\alpha_s$ at very high
density and non-zero quark masses. The counterterms needed to renormalise the
theory to order $\alpha_s$ is same as the vacuum (non-zero density) theory. We
investigate the response of the theory to non-zero quark masses and chemical
potentials. We study quark number density and quark number susceptibility in
the high density limit, where the ratio of the quark mass to the corresponding
chemical potential is very small ($m/\mu\ll 1$). In this limit both number
density and susceptibility contain a $\ln(m/\mu)$ contribution at order
$\alpha_s$. We compute the scalar and pseudoscalar susceptibilities to order
$\alpha_s$ in three flavour QCD at high density taking quark masses and
chemical potentials to be degenerate and non-zero. At extremely high density,
since $\alpha_s$ is very small, both the susceptibilities are found to be same
in the chiral limit. This means that the scalar-pseudoscalar splitting is
absent in the CFL phase.


title: Electromagnetic suppression of the decay mu --> e+gamma

abstract:
  Due to large QED anomalous dimensions of the electric and magnetic dipole
operators, the rate of the rare muon decay mu --> e+gamma is suppressed by the
factor [ 1- 8 alpha/pi ln(Lambda/m_mu) ], independent of the physics
responsible for the lepton-flavor violation, except for the scale Lambda at
which it occurs. For Lambda = 100 -- 1000 GeV, the resulting decrease of the
rate amounts to about 12 -- 17 %.


title: Hadron-Gluon Interactions and the Pomeron

abstract:
  An interaction term is added to the QCD Lagrangian involving hadron and gluon
fields. An effective vertex is calculated for such interactions through
exchanges of reggeized gluons. This gives rise to an effective coupling for
hadron-gluon elastic scattering in the t-channel, which is used in an inclusive
hadron-hadron interaction from which the Pomeron intercept alpha(0) is
calculated.


title: The Cosmological Constant, False Vacua, and Axions

abstract:
  It is suggested that the true ground state of the world has exactly vanishing
vacuum energy and that the cosmological constant that seems to have been
observed is due to our region of the universe being stuck in a false vacuum,
whose energy is split from the true vacuum by non-renormalizable operators that
are suppressed by powers of the Planck scale. It is shown that conventional
invisible axion models typically have the features needed to realize this
possibility. In invisible axion models the same field and the same potential
can explain both the cosmological constant (or dark energy) and the dark
matter. It is also shown that the idea can be realized in non-axion models, an
example of which is given having $\Lambda = M_W^7/M_{Pl}^3$, which accords well
with the observed value.


title: Eikonal Evolution and Gluon Radiation

abstract:
  We give a simple quantum mechanical formulation of the eikonal propagation
approximation, which has been heavily used in recent years in problems
involving hadronic interactions at high energy. This provides a unified
framework for several approaches existing in the literature. We illustrate this
scheme by calculating the total, elastic, inelastic and diffractive DIS cross
sections, as well as gluon production in high energy hadronic collisions. From
the q-qbar-g-component of the DIS cross sections, we straightforwardly derive
low x evolution equations for inelastic and diffractive DIS distribution
functions. In all calculations, we provide all order 1/N corrections to the
results existing in the literature.


title: Flavor without Flavor Symmetry

abstract:
  Non-trivial patterns of quark and lepton masses and mixings can arise without
there being any underlying flavor symmetry that distinguishes among the three
families. Two realistic examples are given.


title: Constraints on the size of the quark gluon plasma

abstract:
  We use simple entropy arguments to estimate the possible size of the QGP at
the AGS and the SPS. We find that the possibility to form a large volume of QGP
at the AGS or the SPS is very small. The size of the QGP at RHIC and the LHC is
also predicted.


title: Calculation of 1-loop Hexagon Amplitudes in the Yukawa Model

abstract:
  We calculate a class of one-loop six-point amplitudes in the Yukawa model.
The construction of multi-particle amplitudes is done in the string inspired
formalism and compared to the Feynman diagrammatic approach. We show that there
exists a surprisingly efficient way of calculating such amplitudes by using
cyclic identities of kinematic coefficients and discuss in detail cancellation
mechanisms of spurious terms. A collection of formulas which are useful for the
calculation of massless hexagon amplitudes is given.


title: Quarkonium suppression as a probe of a saturated gluon plasma ?

abstract:
  A dense parton system is expected to be formed in the early stage of
relativistic heavy-ion collisions at RHIC energies and above. The probability
of a quark gluon plasma production and the resulting strength of its signatures
depends strongly on the initial conditions associated to the distributions of
partons in the nuclear wave functions. At very high energies, the growth of
parton distributions should saturate, possibly forming a Color Glass
Condensate, which is characterized by a bulk momentum scale $Q_s$. As a direct
consequence, the possible signatures of the QGP should be $Q_s$-dependent if
the saturation scenario is valid for RHIC and LHC. In this Letter we assume the
saturation scenario for the QGP formation and estimate the saturation scale
dependence of quarkonium suppression. We conclude that, if this scenario is
valid, the $\Upsilon$ suppression only occurs at large values of $Q_s$.


title: tau -> mu gamma and mu -> e gamma as probes of neutrino mass models

abstract:
  We discuss the possibility of discriminating between different supersymmetric
see-saw models by improving the experimental sensitivity to charged lepton
flavour violating processes. Assuming a hierarchical neutrino mass spectrum, we
classify realistic see-saw models according to how the hierarchy Delta
m^2_{sun} << Delta m^2_{atm} is generated, and study the predictions of each
class for the branching ratios of tau -> mu gamma and mu -> e gamma. The
process tau -> mu gamma is found to be a particularly promising tool to probe
the fundamental see-saw parameters, and especially to identify the origin of
the large atmospheric mixing angle. Predictions for mu -> e gamma are more
model-dependent. We point out that, even with an improvement of the
experimental sensitivities by three orders of magnitude, both tau -> mu gamma
and mu -> e gamma could escape detection in models where Delta m^2_{atm} is
determined by one of the lightest right-handed neutrinos.


title:
Soft Color Interactions and Diffractive Hard Scattering at the Fermilab
  Tevatron

abstract:
  An improved understanding of nonperturbative QCD can be obtained by the
recently developed soft color interaction models. Their essence is the
variation of color string-field topologies, giving a unified description of
final states in high energy interactions, e.g., diffractive and nondiffractive
events in ep and ppbar. Here we present a detailed study of such models (the
soft color interaction model and the generalized area law model) applied to
ppbar, considering also the general problem of the underlying event including
beam particle remnants. With models tuned to HERA ep data, we find a good
description also of Tevatron data on production of W, beauty and jets in
diffractive events defined either by leading antiprotons or by one or two
rapidity gaps in the forward or backward regions. We also give predictions for
diffractive J/psi production where the soft exchange mechanism produces both a
gap and a color singlet ccbar state in the same event. This soft color
interaction approach is also compared with Pomeron-based models for
diffraction, and some possibilities to experimentally discriminate between
these different approaches are discussed.


title:
Model-dependent and independent implications of the first Sudbury
  Neutrino Observatory results

abstract:
  We briefly discuss some implications of the first solar \nu results from the
Sudbury Neutrino Observatory (SNO) experiment in the charged-current channel.
We first show that the present SNO response function is very similar to the
Super-Kamiokande (SK) one above 8.6 MeV in kinetic electron energy. On the
basis of such equivalence we confirm, in a completely model-independent way,
the SNO evidence for an active, non-electron neutrino component in the SK event
sample, with a significance greater than 3 sigma. Then, by assuming no
oscillations into sterile neutrinos, we combine the SK+SNO data to derive
allowed regions for two free parameters: (i) the ratio f_B of the true B \nu
flux from the Sun to the corresponding value predicted by the standard solar
model (SSM), and (ii) the \nu_e survival probability <Pee>, averaged over the
common SK and SNO response function. We obtain the separate 3sigma ranges:
f_B=1.03^{+0.50}_{-0.58} (in agreement with the SSM central value, f_B=1) and
<Pee> =0.34^{+0.61}_{-0.18} (in >3sigma disagreement with the standard
electroweak model prediction, <Pee>=1, with strong anticorrelation between the
two parameters. Finally, by taking f_B and its uncertainties as predicted by
the SSM, we perform an updated analysis of the $2\nu$ active neutrino
oscillation parameters (\delta m^2,\tan^2\omega) including all the solar \nu
data, as well as the spectral data from the CHOOZ reactor experiment. We find
that only the solutions at \tan^2\omega~O(1) survive at the 3sigma level in the
global fit, with a preference for the one at high \delta m^2---the so-called
large mixing angle solution.


title: Instantons in the Saturation Environment

abstract:
  We show that instanton calculations in QCD become theoretically well defined
in the gluon saturation environment which suppresses large size instantons. The
effective cutoff scale is determined by the inverse of the saturation scale. We
concentrate on two most important cases: the small-x tail of a gluon
distribution of a high energy hadron or a large nucleus and the central
rapidity region in a high energy hadronic or heavy ion collision. In the
saturation regime the gluon density in a single large ultrarelativistic nucleus
is high and gluonic fields are given by the classical solutions of the
equations of motion. We show that these strong classical fields do not affect
the density of instantons in the nuclear wave function compared to the
instanton density in the vacuum. A classical solution with non-trivial
topological charge is found for the gluon field of a single nucleus at the
lowest order in the instanton perturbation theory. In the case of
ultrarelativistic heavy ion collisions a strong classical gluonic field is
produced in the central rapidity region. We demonstrate that this field
introduces a suppression factor of exp{-c \rho^4 Q_s^4 / [8 \alpha^2 N_c (Q_s
\tau)^2]} in the instanton size distribution, where Q_s is the saturation scale
of both (identical) nuclei, \tau is the proper time and c = 1 is the gluon
liberation coefficient. This factor suggests that gluonic saturation effects at
the early stages of nuclear collisions regulate the instanton size distribution
in the infrared region and make the instanton density finite by suppressing
large size instantons.


title:
Thermally Generated Gauge Singlet Scalars as Self-Interacting Dark
  Matter

abstract:
  We show that a gauge singlet scalar S, with a coupling to the Higgs doublet
of the form lambda_{S} S^{\dagger}S H^{\dagger}H and with the S mass entirely
generated by the Higgs expectation value, has a thermally generated relic
density Omega_{S} \approx 0.3 if m_{S} \approx
(2.9-10.5)(Omega_{S}/0.3)^{1/5}(h/0.7)^{2/5} MeV for Higgs boson masses in the
range 115 GeV to 1 TeV. Remarkably, this is very similar to the range (m_{S} =
(6.6-15.4)\eta^{2/3} MeV) required in order for the self-interaction
(\eta/4)(S^{\dagger}S)^{2} to account for self-interacting dark matter when
\eta is not much smaller than 1. The corresponding coupling is lambda_{S}
\approx (2.7 \times 10^{-10} - 3.6 \times
10^{-9})(Omega_{S}/0.3)^{2/5}(h/0.7)^{4/5}, implying that such scalars are very
weakly coupled to the Standard Model sector.


title:
Determining the phases alpha and gamma from time-dependent CP violation
  in B0 decays to rho(omega) + pseudoscalar

abstract:
  A method is proposed for the determination of the unitarity angle alpha
through tree penguin interference. The modes needed would be of the form
B0/B0-bar -> rho0 M and B0/B0-bar -> omega M where M is spin-0 uu-bar/dd-bar
meson, for instance M=pi0, eta, eta',a0 or f0. An analogous method can also
determine gamma using M=KS or K_L. The validity of the theoretical
approximations used may be tested by over determining alpha with several modes.
If two or more modes are used, the determination has a four-fold ambiguity but
additional information from pure penguin decays or theoretical estimates may be
used to reduce the ambiguity to alpha, alpha+pi. The method as applied to
determining gamma is probably less promising.


title:
Constraints on Electron-quark Contact Interactions and Implications to
  models of leptoquarks and Extra Z Bosons

abstract:
  We update the global constraint on four-fermion $ee q q$ contact
interactions. In this update, we included the published data of H1 and ZEUS for
the 94--96 run in the $e^+ p$ mode and the newly published data of H1 for the
1999 run in the $e^- p$ mode. Other major changes are the new LEPII data on
hadronic cross sections above 189 GeV, and the atomic parity violation
measurement on Cesium because of a new and improved atomic calculation, which
drives the data within $1\sigma$ of the standard model value. The global data
do not show any evidence for contact interactions, and we obtain 95% C.L.
limits on the compositeness scale. A limit of $\Lambda^{eu}_{LL+(-)} > 23
(12.5)$ TeV is obtained. Implications to models of leptoquarks and extra Z
bosons are examined.


title: MONOLITH: a high resolution neutrino oscillation experiment

abstract:
  MONOLITH is a proposed massive magnetized tracking calorimeter at the Gran
Sasso laboratory in Italy, optimized for the detection of atmospheric muon
neutrinos. The main goal is to test the neutrino oscillation hypothesis through
an explicit observation of the full first oscillation swing. The sensitivity
range for this measurement comfortably covers the entire Super-Kamiokande
allowed region. Other measurements include studies of matter effects, the NC/CC
and neutrino/anti-neutrino ratio with atmospheric neutrinos and auxiliary
measurements from the CERN to Gran Sasso neutrino beam. Depending on approval,
data taking with part of the detector could start in 2005. The MONOLITH
detector and its performance are described.


title:
Supersymmetric Electroweak Corrections to Sbottom Decay into Lighter
  Stop and Charged Higgs Boson

abstract:
  The Yukawa corrections of order ${\cal O}(\alpha_{ew}m_{t(b)}^2/m_W^2)$,
${\cal O}(\alpha_{ew}m_{t(b)}^3/m_W^3)$ and ${\cal
O}(\alpha_{ew}m_{t(b)}^4/m_W^4)$ to the width of sbottom decay into lighter
stop plus charged Higgs boson are calculated in the Minimal Supersymmetric
Standard Model. These corrections depend on the masses of charged Higgs boson
and lighter stop, and the parameters $\tan\beta$ and $\mu$. For favorable
parameter values, the corrections decrease or increase the decay widths
significantly. Especially for high values of $\tan\beta$(=30) the corrections
exceed at least 10% for both $\tilde b_1$ and $\tilde b_2$ decay. But for low
values of $\tan\beta$(=4,10) the corrections are small and the magnitudes are
less than 10%. The numerical calculations also show that using the running
bottom quark mass which includes the QCD effects and resums all high order
$\tan\beta$-enhanced effects can improve much the convergence of the
perturbation expansion.


title: Transverse Lambda polarization in unpolarized semi-inclusive DIS

abstract:
  The long-standing problem of transverse Lambda polarization in high-energy
collisions of unpolarized hadrons can be tackled by considering new, spin and
k_T-dependent quark fragmentation functions for an unpolarized quark into a
polarized, spin-1/2 hadron. Simple phenomenological parameterizations of these
new "polarizing fragmentation functions", which describe quite well the
experimental data on Lambda and Lambda-bar hyperons produced in p-A processes,
are utilized and extended here to give predictions for transverse Lambda
polarization in semi-inclusive DIS


title:
Implications of the Higgs Boson Searches on Different Soft SUSY-breaking
  Scenarios

abstract:
  We investigate the Higgs boson sector of the Minimal Supersymmetric Standard
Model (MSSM) in the framework of the three most prominent soft SUSY-breaking
scenarios, mSUGRA, MGMSB and mAMSB. For each scenario, we determine the
parameters at the electroweak scale from the set of input variables at higher
energy scales (depending on the specific scenario) and evaluate the Higgs boson
properties. The latter are based on results obtained within the
Feynman-diagrammatic approach by taking into account the complete one-loop and
the dominant two-loop contributions. The maximum value of the mass of the
lightest neutral CP-even MSSM Higgs boson, m_h, is determined in the three
scenarios, and the behavior of the Higgs couplings to fermions and gauge bosons
is investigated. Restrictions on tan beta and on the set of higher-energy scale
parameters are derived from the lower limits arising from the Higgs search at
LEP2. We furthermore discuss the regions of parameter space in the three
scenarios compatible with interpreting the excess observed at LEP2 as a Higgs
signal, with m_h = (115.0 + 1.3 - 0.9) GeV. The case where the events observed
at LEP2 could originate from the production of the heavier neutral CP-even
Higgs boson is also considered. The implications of a possible Higgs signal at
115 GeV for SUSY searches at future colliders are briefly discussed for each of
the three scenarios.


title: Longitudinal Lambda polarization in polarized semi-inclusive DIS

abstract:
  We calculate, within pQCD parton model at leading orders, the expression of
the longitudinal polarization of Lambda baryons produced in polarized
semi-inclusive DIS, including weak interaction effects. We present some
numerical estimates in few cases for which data are or will soon be available
and discuss how to gather new information on polarized fragmentation functions.


title: Langevin Evolution of Disoriented Chiral Condensate

abstract:
  As the matter produced in a relativistic heavy ion collision cools through
the QCD phase transition, the dynamical evolution of the chiral condensate will
be driven out of thermal equilibrium. As a prelude to analyzing this evolution,
and in particular as a prelude to learning how rapid the cooling must be in
order for significant deviations from equilibrium to develop, we present a
detailed analysis of the time-evolution of an idealized region of disoriented
chiral condensate. We set up a Langevin field equation which can describe the
evolution of these (or more realistic) linear sigma model configurations in
contact with a heat bath representing the presence of other shorter wavelength
degrees of freedom. We first analyze the model in equilibrium, paying
particular attention to subtracting ultraviolet divergent classical terms and
replacing them by their finite quantum counterparts. We use known results from
lattice gauge theory and chiral perturbation theory to fix nonuniversal
constants. The result is a theory which is ultraviolet cutoff independent and
that reproduces quantitatively the expected equilibrium behavior of the quantum
field theory of pions and sigma fields over a wide range of temperatures.
Finally, we estimate the viscosity $\eta(T)$, which controls the dynamical
timescale in the Langevin equation, by requiring that the timescale for DCC
decay agrees with previous calculations. The resulting $\eta(T)$ is larger than
that found perturbatively. We also determine the temperature below which the
classical field Langevin equation ceases to be a good model for the quantum
field dynamics.


title:
Global Analysis of Solar Neutrino Oscillations Including SNO CC
  Measurement

abstract:
  For active and sterile neutrinos, we present the globally allowed solutions
for two neutrino oscillations. We include the SNO CC measurement and all other
relevant solar neutrino and reactor data. Five active neutrino oscillation
solutions (LMA, LOW, SMA, VAC, and Just So2) are currently allowed at 3 sigma;
three sterile neutrino solutions (Just So2, SMA, and VAC) are allowed at 3
sigma. The goodness of fit is satisfactory for all eight solutions. We also
investigate the robustness of the allowed solutions by carrying out global
analyses with and without: 1) imposing solar model constraints on the 8B
neutrino flux, 2) including the Super-Kamiokande spectral energy distribution
and day-night data, 3) including a continuous mixture of active and sterile
neutrinos, 4) using an enhanced CC cross section for deuterium (due to
radiative corrections), and 5) a optimistic, hypothetical reduction by a factor
of three of the error of the SNO CC rate. For every analysis strategy used in
this paper, the most favored solutions all involve large mixing angles: LMA,
LOW, or VAC. The favored solutions are robust, but the presence at 3 sigma of
individual sterile solutions and the active Just So2 solution is sensitive to
the analysis assumptions.


title:
On the dynamics of phase transitions and the nonequilibrium formation of
  topological defects

abstract:
  We study the formation of topological defects in nonequilibrium phase
transitions of both classical and quantum field theory. We examine three model
systems. 1). The phase transition of a quantum scalar field in a FRW universe
is analyzed through a first-principles approach in which the dynamics of the
two-point function is derived from the two-loop, two-particle-irreducible
closed-time-path effective action. Identifying signatures of correlated domains
in the infrared portion of the momentum-space power spectrum we find that the
domain size scales as a power-law with the expansion rate of the universe. The
observed power-law scaling is in good agreement with the predictions of the
Kibble-Zurek mechanism of defect formation and provides evidence of the
freeze-out scenario in the context of nonequilibrium quantum field theory. 2).
The formation and interaction of topological textures is analyzed in the phase
transition of a classical O(3) scalar field theory in 2+1 dimensions. We
provide quantiive arguments that by the end of the transition the length scales
of the texture distribution result from a competition between the length scale
determined at freeze-out and the ordering dynamics of a textured system. 3). We
discuss a black hole phase transition in semiclassical gravity. We review the
thermodynamics of a black hole system and determine that the phase transition
is entropically driven. We introduce a quantum atomic model of the equilibrium
black hole system and show that the phase transition is realized as the abrupt
excitation of a high energy state. We investigate the nonequilibrium dynamics
of the black hole phase transition and explore similar examples from the
Kosterlitz-Thouless transition in condensed matter to the Hagedorn transition
in string theory.


title: Single-spin asymmetries and soft-gluon poles

abstract:
  Mechanism for the single transverse spin asymmeties in the pion production,
p^\uparrow + p'\to \pi(\ell_T) + X, and the \Lambda hyperon polarization, p +
p' \to \Lambda^\uparrow (\ell_T)+ X, is investigated in the framework of QCD
factorization theorem. We identify all the soft-gluon pole contributions coming
from the twist-3 distribution and/or fragmentation functions and show that they
give rise to large asymmetries at large x_F.


title:
Precision measurements, extra quark-lepton generations and 50 GeV
  neutrinos

abstract:
  The existence of extra chiral generations with all fermions heavier than
$m_Z$ is strongly disfavored by the precision electroweak data. However the
data still allow a few extra generations if the neutral leptons have masses
close to 50 GeV. Such heavy neutrino can be searched in the reaction $e^+ e^-
\to N\bar{N}\gamma$. Existence of 50 GeV neutrinos makes standard model Higgs
boson invisible.


title: Quark-hadron duality: resonances and the onset of scaling

abstract:
  We examine the origin of Bloom-Gilman duality and the relationship between
resonances and scaling in deep-inelastic scattering. A simple quantum
mechanical model is used to illustrate the essential features of Bloom-Gilman
duality at low momentum transfer. As an application of local duality, we
discuss model-independent relations between structure functions at x ~ 1 and
elastic electromagnetic form factors.


title: Parton Distribution of Proton in a Simple Statistical Model

abstract:
  This paper has been withdrawn by the authors. due fail of replacement of the
paper. new version is hep-ph/0201214.


title: Impact of the first SNO results on Neutrino Mass and Mixing

abstract:
  We investigate the implications of the SNO charged-current (CC) and electron
scattering (ES) measurements of solar \br neutrino fluxes for neutrino mass and
mixing parameters by performing a global and unified $\chi^2$ analysis of the
solar neutrino data in the framework of two neutrino mixing. We consider both
$\nu_e -\nu_{active}$ and $\nu_e -\nu_{sterile}$ solutions and perform (i)
analysis of the total rates data of Cl, Ga, SK and SNO experiments and (ii)
global analysis including the total rates data, the recoil electron spectrum
data of SK and the CC spectrum observed at SNO. For the $\nu_e-\nu_{active}$
case the inclusion of the SNO results in the analysis of the total rates
reduces(enhances) the goodness-of-fit (GOF) of the SMA(LMA) solution. The flat
spectrum observed at SK further favours the LMA solution over the SMA solution
and no allowed area is obtained in the SMA region at 3$\sigma$ level from the
global analysis. For the $\nu_e -\nu_{sterile}$ case, with the inclusion of the
SNO results, all the solutions are disfavoured with a probability of more than
99% from the total rates analysis while for the global analysis the GOF of
these become much worse.


title:
The decays \bar{B}->\bar{K}D and \bar{B}-> \bar{K}\bar{D} and final
  state interactions

abstract:
  The decays \bar{B}-> \bar{K}D and \bar{B}-> \bar{K}\bar{D} taking into
account final state interactions are discussed. These decays are described by
four strong phases \delta_0,\delta_1,\bar{\delta}_0,\bar{\delta}_1 (subscripts
0 and 1 refers to I=0 and I=1 final states), one weak phase \gamma and four
real amplitudes. It is argued that strong interaction dynamics implies
\bar{\delta}_1=0,\delta_0=-\delta_1. Rescattering has significant effects on
weak amplitudes. Taking into account, rescattering, we find that direct
CP--violating asymmetry in these decays may lie in the range \mp 0.023\sin
\gamma \leq \QTR{cal}{A}_{1,2}\leq \mp 0.086\sin \gamma.


title:
Event-by-event fluctuations in hydrodynamical description of heavy-ion
  collisions

abstract:
  Effects caused by the event-by-event fluctuation of the initial conditions in
hydrodynamical description of high-energy heavy-ion collisions are
investigated. Non-negligible effects appear for several observable quantities,
even for a fixed impact parameter $\vec b $. They are sensitive to the equation
of state, being the dispersions of the observable quantities in general smaller
when the QGP phase appears at the beginning of hydrodynamic evolution than when
the fluid remains hadron gas during whole the evolution.


title:
Optimal observables to search for indirect supersymmetric QCD signals in
  Higgs boson decays

abstract:
  In this work we study the indirect effects of squarks and gluinos via
supersymmetric QCD radiative corrections in the decays of Higgs particles
within the Minimal Supersymmetric Standard Model. We consider a heavy
supersymmetric spectrum and focus on the main nondecoupling effects. We propose
a set of observables that are sensitive to these corrections and that will be
accessible at the CERN Large Hadron Collider and Fermilab Tevatron. These
observables are the ratios of Higgs boson branching ratios into quarks divided
by the corresponding Higgs boson branching ratios into leptons, and both
theoretical and experimental uncertainties are expected to be minimized. We
show that these nondecoupling corrections are sizable for all the proposed
observables in the large $\tan\beta$ region and are highly correlated. A global
analysis of all these observables will allow the experiments to reach the
highest sensitivity to indirect supersymmetric signals.


title:
Off-Diagonal 5D Metrics and Mass Hierarchies with Anisotropies and
  Running Constants

abstract:
  The gravitational equations of the three dimensional (3D) brane world are
investigated for both off-diagonal and warped 5D metrics which can be
diagonalized with respect to some anholonomic frames when the gravitational and
matter fields dynamics are described by mixed sets of holonomic and anholonomic
variables. We construct two new classes of exact solutions of Kaluza-Klein
gravity which generalize the Randall-Sundrum metrics to configurations with
running on the 5th coordinate gravitational constant and anisotropic
dependencies of effective 4D constants on time and/or space variables. We
conclude that by introducing gauge fields as off-diagonal components of 5D
metrics, or by considering anholonomic frames modelling some anisotropies in
extra dimension spacetime, we induce anisotropic tensions (gravitational
polarizations) and running of constants on the branes. This way we can generate
the TeV scale as a hierarchically suppressed anisotropic mass scale and the
Newtonian and general relativistic gravity are reproduced with adequate
precisions but with corrections which depend anisotropically on some
coordinates.


title:
Transverse energy dependence of J/Psi suppression in Au+Au collisions at
  RHIC energy

abstract:
  Prediction for transverse energy dependence of $J/\psi$ to Drell-Yan ratio in
Au+Au collisions at RHIC energy was obtained in a model which assume 100%
absorption of $J/\psi$ above a threshold density. The threshold density was
obtained by fitting the NA50 data on $J/\psi$ suppression in Pb+Pb collisions
at SPS energy. At RHIC energy, hard processes may be important. Prediction of
$J/\psi$ suppression with and without hard processes were obtained. With hard
processes included, $J/\psi$'s are strongly suppressed.


title:
Peculiar effects in the combination of neutrino decay and neutrino
  oscillations

abstract:
  In this talk, we will demonstrate some concepts of a simultaneous treatment
of neutrino decays and neutrino oscillations in an illustrative manner. This
includes topics such as phase coherence discussions and time delay effects of
massive supernova neutrinos.


title:
Anisotropic $e^+ e^-$ pressure due to the QED effect in strong magnetic
  fields and the application to the entropy production in neutrino-driven wind

abstract:
  We study the equation of state of electron in strong magnetic fields which
are greater than the critical value $B_c \simeq 4.4 \times 10^{13}$ Gauss. We
find that such a strong magnetic field induces the anisotropic pressure of
electron. We apply the result to the neutrino-driven wind in core-collapse
supernovae and find that it can produce large entropy per baryon, $S \sim 400
k_B$. This mechanism might successfully account for the production of the heavy
nuclei with mass numbers A = 80 -- 250 through the r-process nucleosynthesis.


title: No cosmological domain wall problem for weakly coupled fields

abstract:
  After inflation occurs, a weakly coupled scalar field will in general not be
in thermal equilibrium but have a distribution of values determined by the
inflationary Hubble parameter. If such a field subsequently undergoes discrete
symmetry breaking, then the different degenerate vacua may not be equally
populated so the domain walls which form will be `biased' and the wall network
will subsequently collapse. Thus the cosmological domain wall problem may be
solved for sufficiently weakly coupled fields in a post-inflationary universe.
We quantify the criteria for determining whether this does happen, using a
Higgs-like potential with a spontaneously broken $Z_2$ symmetry.


title: The Breaking of Isospin and the rho-omega-System

abstract:
  Simple quark models for the low lying vector mesons suggest a mixing between
the u- and d-flavors and a violation of the isospin symmetry for the rho-omega
system much stronger than observed. It is shown that the chiral dynamics,
especially the QCD anomaly, is responsible for a restoration of the isospin
symmetry in the rho-omega system.


title: Status of Hard Interactions (Jets and Heavy Flavor)

abstract:
  We review the status of hard interactions, in particular of jet and heavy
flavor production, at HERA and LEP. Emphasis is given to recent theoretical
developments. Instantons, event shapes, and prompt photons are also briefly
discussed.


title: The MSSM invisible Higgs in the light of dark matter and g-2

abstract:
  Giving up the assumption of the gaugino mass unification at the GUT scale,
the latest LEP and Tevatron data still allow the lightest supersymmetric Higgs
to have a large branching fraction into invisible neutralinos. Such a Higgs may
be difficult to discover at the LHC and is practically unreachable at the
Tevatron. We argue that, for some of these models to be compatible with the
relic density, light sleptons with masses not far above the current limits are
needed. There are however models that allow for larger sleptons masses without
being in conflict with the relic density constraint. This is possible because
these neutralinos can annihilate efficiently through a Z-pole. We also find
that many of these models can nicely account, at the 2\sigma level, for the
discrepancy in the latest g-2 measurement. However, requiring consistency with
the g-2 at the 1\sigma level, excludes models that lead to the largest Higgs
branching fraction into LSP's. In all cases one expects that even though the
Higgs might escape detection, one would have a rich SUSY phenomenology even at
the Tevatron, through the production of charginos and neutralinos.


title: On Domain-like Structures in the QCD Vacuum

abstract:
  We suggest that clusters or domains of topological charge and action density
occur in the QCD vacuum as an effect of singularities in gauge fields and can
simultaneously lead to confinement and chiral symmetry breaking. The string
constant, condensates and topological susceptibility are estimated within a
simplified model of hyperspherical domains with interiors of constant field
strength with reasonable values obtained. Propagators of dynamical quarks and
gluons have compact support in configuration space, thus having entire Fourier
transforms, which gives rise to their confinement.


title: Search for t->ch at e+e- Linear Colliders

abstract:
  We study the rare top-quark decay t->ch, where h is a generic Higgs boson, at
a linear collider. If kinematically accessible, all models contain this decay
at some level due to quark flavor mixing. Some models, such as Model III of the
two-Higgs doublet model, have a tree-level top-charm-Higgs coupling, and the
branching ratio is close to 0.5%. Others, such as the MSSM, have a coupling
induced at one-loop, and can have a branching ratio in the range of 10^{-5} -
5x10^{-4}. We find that a linear collider of root(s) = 500 GeV and a luminosity
of 500 fb^{-1} will begin to be sensitive to this range of the coupling.


title: Out-of-plane QCD radiation in hadronic Z0 production

abstract:
  We present the QCD analysis of the cumulative out-of-event-plane momentum
distribution in the process proton-antiproton into Z0 and a hard jet (event
plane defined by the proton, antiproton and Z0 momenta). Particular attention
is placed on the near-to-planar events for which we derive the all-order
resummed result to next-to-leading accuracy. We consider also the leading power
correction originating from the fact that, even in hard processes, the resummed
QCD coupling runs into the infrared region. We aim at the same level of
accuracy which, in e+e- annihilation, seems to be sufficient for making
predictions. Contributions from a ``soft underlying event'' due to beam remnant
interactions are discussed. Experimental data (not yet available) are needed to
cast light on the predictive level of standard QCD analysis in hard
hadron-hadron collisions. We plot examples of the predicted distribution at
Tevatron energies. The techniques here developed can be extended to other hard
hadron-hadron and hadron-lepton processes.


title: Kzero--Anti-Kzero and Bzero--Anti-Bzero Constraints On Technicolor

abstract:
  I propose a resolution of the strong CP problem of quarks based on vacuum
alignment in theories of dynamically broken electroweak and flavor symmetries.
Mixing in the neutral B and K--meson systems is used to restrict the form of
quark mass and mixing matrices and to constrain the masses of the topcolor
gauge bosons V_8 and Z' to be greater than 5 TeV. The K^0 mixing parameter
epsilon is calculated for models whose quark mass matrix leads to weak, but not
strong, CP violation. It is easy to accomodate its value in some models while,
in others, no reasonable combination of extended technicolor and topcolor
masses can account for epsilon.


title: Predictions of the sign of \mu from supersymmetry breaking models

abstract:
  The sign of the supersymmetric Higgs mass \mu is usually taken as an
independent input parameter in analyses of the supersymmetric standard model. I
study the role of theories of supersymmetry breaking in determining the sign of
\mu as an output. Models with vanishing soft scalar couplings at the apparent
gauge coupling unification scale are known to predict positive \mu. I
investigate more general results for the sign of \mu as a function of the
holomorphic soft scalar couplings, and compare to predictions of models with
gaugino mass dominance at higher scales. In a significant region of the
B_0/m_{1/2} versus A_0/m_{1/2} plane including A_0 = B_0 = 0, \mu must be
positive. In another region, \mu is definitely negative. Only in a smaller
intermediate region does knowledge of the supersymmetry breaking mechanism not
permit a definite prediction of the sign of \mu. The last region will shrink
considerably as the top quark mass becomes more accurately known.


title: Scale of fermion mass generation

abstract:
  Unitarity of longitudinal weak vector boson scattering implies an upper bound
on the scale of electroweak symmetry breaking, $\Lambda_{EWSB}\equiv
\sqrt{8\pi}v\approx$ 1 TeV. Appelquist and Chanowitz have derived an analogous
upper bound on the scale of fermion mass generation, proportional to $v^2/m_f$,
by considering the scattering of same-helicity fermions into pairs of
longitudinal weak vector bosons in a theory without a standard Higgs boson. We
show that there is no upper bound, beyond that on the scale of electroweak
symmetry breaking, in such a theory. This result is obtained by considering the
same process, but with a large number of longitudinal weak vector bosons in the
final state. We further argue that there is no scale of (Dirac) fermion mass
generation in the standard model. In contrast, there is an upper bound on the
scale of Majorana-neutrino mass generation, given by $\Lambda_{Maj}\equiv 4\pi
v^2/m_\nu$. In general, the upper bound on the scale of fermion mass generation
depends on the dimensionality of the interaction responsible for generating the
fermion mass. We explore the scale of fermion mass generation in a variety of
excursions from the standard model: models with fermions in nonstandard
representations, a theory with higher-dimension interactions, a
two-Higgs-doublet model, and models without a Higgs boson.


title: The evolution and persistence of dumbbells

abstract:
  We use large-scale numerical simulations to study the formation and evolution
of non-topological defects in a generalized electroweak phase transition
described by the Glashow-Salam-Weinberg model without fermions. Such defects
include dumbbells, comprising a pair of monopoles joined by a segment of
electroweak string. These exhibit complex dynamics, with some shrinking under
the string tension and others growing due to the monopole-antimonopole
attractions between near neighbours. We estimate the range of parameters where
the network of dumbbells persists, and show that this region is narrower than
the region within which infinite straight electroweak strings are
perturbatively stable.


title: Parameters' domain in three flavour neutrino oscillations

abstract:
  We consider analytically the domain of the three mixing angles $\Theta_{ij}$
and the CP phase $\delta$ for three flavour neutrino oscillations both in
vacuum and matter. Similarly to the quark sector, it is necessary and
sufficient to let all the mixing angles $\Theta_{12},\Theta_{13},\Theta_{23}$
and $\delta$ be in the range $<0,\frac{\pi}{2}>$ and $0 \leq \delta < 2 \pi$,
respectively. To exploit the full range of $\delta$ will be important in future
when more precise fits are possible, even without CP violation measurements.
With the above assumption on the angles we can restrict ourselves to the
natural order of masses $m_1<m_2<m_3$. Considerations of the mass schemes with
some negative $\delta m^2$'s, though for some reasons useful, are not necessary
from the point of view of neutrino oscillation parametrization and cause double
counting only. These conclusions are independent of matter effects.


title:
A Contribution of Photon Hadronic Component in the Leptoproduction
  Charmed Structure Function at Large x and Q^2

abstract:
  We calculated the contribution of the photon hadronic component in the
charmed structure function of the leptoproduction. The contribution comes from
scattering of the c quarks of the virtual photon on the quarks and gluons of
the proton. Comparison of our calculations with the measurements of the charm
production in $\mu^+p$-scattering by EMC shows, that contribution of resolved
photon can explain the excess of EMC data over the predictions of the
photon-gluon fusion model at large momentum transfers. Thus, one does not need
to use a non-perturbative admixture of the charmed quarks in the proton wave
function (''intrinsic charm'') to describe such an excess in EMC data.


title: Status of Structure Functions and Partons

abstract:
  We briefly review some of the developments in the study of parton
distributions which have occurred since DIS2000, including discussion of
uncertainties, shadowing, unintegrated and generalized distributions.


title: Model for fermion mass matrices and the origin of quark-lepton symmetry

abstract:
  Several phenomenological features of fermion masses and mixings can be
accounted for by a simple model for fermion mass matrices, which suggests an
underlying U(2) horizontal symmetry. In this context, it is also proposed how
an approximate quark-lepton symmetry can be achieved without unified gauge
theories.


title:
Indirect Bounds on Z-> mu e and Lepton Flavor Violation at Future
  Colliders

abstract:
  Motivated by the interest in lepton number violating processes, we study the
connection between the rate of Z -> mu e decay and those of the low-energy
processes mu ->3 e, and mu -> e conversion in nuclear field. We show that if
the vector or axial Z form factors are dominant, Br(Z->mu e) is not observable,
while if the Z dipole form factors are dominant, the relatively weak indirect
bound Br(Z->mu e)<7 10^{-9} does not fully preclude a signal at future
colliders, as TESLA. We finally comment on the relation of Z->mu e with Z->tau
e and Z->tau mu decays, and suggest a simple scaling law for these three
processes.


title:
Fourth generation effects in rare (B_s -> l^+ l^-) and (B_s -> l^+ l^-
  gamma) decays

abstract:
  The contribution of the fourth generation quarks to the rare (B_s -> l^+ l^-)
and (B_s -> l^+ l^- gamma) decays are studied. Constraints on the extended
Cabibbo-Kobayashi-Maskawa matrix elements |V_{tb} V_{ts}*| and |V_{t'b}
V_{t's}*| are obtained from the existing experimental result for the branching
ratio of the (B -> X_s gamma) decay. The branching ratios of the
above-mentioned decays, as well as the photon spectrum in the (B_s -> l^+ l^-
gamma) decay, are studied. It is found that the results are sensitive to the
existence of the fourth generation.


title: More on the Interaction Region of PEP-N

abstract:
  The PEP-N project consists of a small, very low-energy e- storage ring (VLER)
located in one of the interaction-straight regions of PEP-II. The small ring is
brought into collision with the low-energy (3.1 GeV) e+ beam (LER). The
center-of-mass energies from this collision are between the Phi and J/Psi
resonances. We achieve a head-on collision through the use of a central
magnetic dipole field that generates a large horizontal bending field. This
field is also the central field of the detector. The large energy range of the
VLER, in order to maximize the center-of-mass energy range, complicates the
collision point geometry. In order to maintain the beam orbits near the
collision point two techniques are used. The first is to scale the central
dipole field up and down with the energy of the VLER and the second is to use
passive shielding to decrease the integral B.dl of the dipole field seen by the
VLER. Changes in the orbit of the LER are corrected with local bending magnets.
Further details of the interaction region geometry as well as design issues
that include synchrotron radiation from the high-current positron beam are
discussed.


title: Baryon Form Factors in QCD

abstract:
  This is a summary of perturbative QCD calculations of baryon form factors.
For e^+ e^- going to baryon-antibaryon pairs, normalized calculations are
available and reported for the entire ground state octet and decuplet,
including off-diagonal form factors, and for the S_{11}(1535)-antiS_{11}. (The
latter results are new for this report.) We also include some explanation of
how the results come to be.


title: Softly Broken A_4 Symmetry for Nearly Degenerate Neutrino Masses

abstract:
  The leptonic Higgs doublet model of neutrino masses is implemented with an
A_4 discrete symmetry (the even permutation of 4 objects or equivalently the
symmetry of the tetrahedron) which has 4 irreducible representations: 1, 1',
1'', and 3. The resulting spontaneous and soft breaking of A_4 provides a
realistic model of charged-lepton masses as well as a nearly degenerate
neutrino mass matrix. Phenomenological consequences at and below the TeV scale
are discussed.


title: A Diagrammatic Interpretation of the Boltzmann Equation

abstract:
  We study nonlinear response in weakly coupled nonequilibrium $\phi^4$ theory
in the context of both classical transport theory and real time quantum field
theory, based on a generalized Kubo formula which we derive. A novel connection
between these two approaches is established which provides a diagrammatic
interpretation of the Boltzmann equation.


title: Associated production of Higgs and single top at hadron colliders

abstract:
  We study the production of the Higgs boson in association with a single top
quark at hadron colliders. The cross sections for the three production
processes (t-channel, s-channel, and W-associated) at both the Tevatron and the
LHC are presented. We investigate the possibility of detecting a signal for the
largest of these processes, the t-channel process at the LHC, via the Higgs
decay into b b-bar. The QCD backgrounds are large and difficult to curb,
hindering the extraction of the signal. Extensions of our analysis to the
production of supersymmetric Higgs bosons are also addressed. The cross section
is enhanced for large values of tangent beta, increasing the prospects for
extracting a signal.


title: Two-Photon Processes at Intermediate Energies

abstract:
  Exclusive hadron production processes in photon-photon collisions provide
important tests of QCD at the amplitude level, particularly as measures of
hadron distribution amplitudes and skewed parton distributions. The
determination of the shape and normalization of the distribution amplitudes has
become particularly important in view of their importance in the analysis of
exclusive semi-leptonic and two-body hadronic B-decays. Interesting two-photon
physics, including doubly-tagged $\gamma^* \gamma^*$ reactions, will be
accessible at low energy, high luminosity $e^+ e^-$ colliders, including
measurements of channels important in the light-by-light contribution to the
muon $g$--2 and the study of the transition between threshold production
controlled by low-energy effective chiral theories and the domain where
leading-twist perturbative QCD becomes applicable. The threshold regime of
hadron production in photon-photon and $e^+ e^-$ annihilation, where hadrons
are formed at small relative velocity, is particularly interesting as a test of
low energy theorems, soliton models, and new types of resonance production.
Such studies will be particularly valuable in double-tagged reactions where
polarization correlations, as well as the photon virtuality dependence, can be
studied.


title: Black Holes at the LHC

abstract:
  If the scale of quantum gravity is near a TeV, the LHC will be producing one
black hole (BH) about every second. The BH decays into prompt, hard photons and
charged leptons is a clean signature with low background. The absence of
significant missing energy allows the reconstruction of the mass of the
decaying BH. The correlation between the BH mass and its temperature, deduced
from the energy spectrum of the decay products, can test experimentally the
higher dimensional Hawking evaporation law. It can also determine the number of
large new dimensions and the scale of quantum gravity.


title:
Rare $B\to K^{*}\nu\bar{\nu}$ decay with polarized $K^{*}$ in the fourth
  generation model

abstract:
  The rare $B\to K^{*}\nu\bar{\nu}$ decay when $K^{*}$ meson is longitudinally
or transversely polarized is analysed in the context of the fourth generation
model. A significant enhancement to the missing energy spectrum over the SM is
recorded.


title: Parton distribution functions in nuclei

abstract:
  Optimum nuclear parton distributions are determined by an analysis of muon
and electron deep inelastic scattering data. Assuming simple A dependence and
polynomial functions of x and 1-x for nuclear modification of parton
distributions, we determine the initial distributions by a chi^2 analysis.
Although valence-quark distributions are relatively well determined except for
the small-x region, antiquark distributions cannot be fixed at medium and large
x. It is also difficult to fix gluon distributions.


title:
Next-to-Next-to-Leading Logarithms in Four-Fermion Electroweak Processes
  at High Energy

abstract:
  We sum up the next-to-next-to-leading logarithmic virtual electroweak
corrections to the high energy asymptotics of the neutral current four-fermion
processes for light fermions to all orders in the coupling constants using the
evolution equation approach. From this all order result we derive finite order
expressions through next-to-next-to leading order for the total cross section
and various asymmetries. We observe an amazing cancellation between the sizable
leading, next-to-leading and next-to-next-to-leading logarithmic contributions
at TeV energies.


title:
A new parametrization of the neutrino mixing matrix for neutrino
  oscillations

abstract:
  In this paper we study three active neutrino oscillations, favored by recent
data from SuperK and SNO, using a new parametrization of the lepton mixing
matrix $V$ constructed from a linear combination of the unit matrix $I$, and a
hermitian unitary matrix $U$, that is, $V = \cos\theta I + i\sin \theta U$.
There are only three real parameters in $V$ including the parameter $\theta$.
It is interesting to find that experimental data on atmospheric neutrino
dictates the angle $\theta$ to be $\pi/4$ such that the $\nu_\mu$ and
$\nu_\tau$ mixing is maximal. The solar neutrino problem is solved via the MSW
effect with a small mixing angle, with $U$ depending on one small parameter
$\epsilon$. The resulting mixing matrix with just two parameters ($\theta$ and
$\epsilon$) predicts that the oscillating probabilities for $\nu_e\to \nu_\mu$
and $\nu_e \to \nu_\tau$ to be equal and of the order $2\epsilon^2 = (0.25\sim
2.5)\times 10^{-3}$. The measurement of CP asymmetries at the proposed Neutrino
Factories would also provide a test of our parametrization.


title: Search for the Higgs boson: theoretical perspectives

abstract:
  We present a short review of experimental and theoretical constraints on the
mass of the Standard Model Higgs boson. We briefly illustrate the
unsatisfactory aspects of the standard theory, and we present some general
considerations about possible non-standard scenarios.


title: Pseudoscalar Meson Mixing in Effective Field Theory

abstract:
  We show that for any effective field theory of colorless meson fields, the
mixing schemes of particle states and decay constants are not only related but
also determined exclusively by the kinetic and mass Lagrangian densities. In
the general case, these are bilinear in terms of the intrinsic fields and
involve non-diagonal kinetic and mass matrices. By applying three consecutive
steps this Lagrangian can be reduced into the standard quadratic form in terms
of the physical fields. These steps are : (i) the diagonalization of the
kinetic matrix, (ii) rescaling of the fields, and (iii) the diagonalization of
the mass matrix. In case, where the dimensions of the non-diagonal kinetic and
mass sub-matrices are respectively, $k\times k$ and $n\times n$, this procedure
leads to mixing schemes which involve $[k(k-1)/2] + [n(n-1)/2]$ angles and $k$
field rescaling parameters. This observation holds true irrespective with the
type of particle interactions presumed. The commonly used mixing schemes,
correspond to a proper choice of the kinetic and mass matrices, and are derived
as special cases. In particular, $\eta$-$\eta '$ mixing, requires one angle, if
and only if, the kinetic term with the intrinsic fields has a quadratic form.


title:
Probing lepton flavour violation in $\nu_{\mu} + N \to \tau + ...$
  scattering and $\mu \to tau$ conversion on nucleons

abstract:
  We study lepton flavour-violating interactions which could result in the
$\tau$-lepton production in the $\nu_{\mu}N$ scattering or in $\mu \to \tau$
conversion on nucleons at high energies. Phenomenological bounds on the
strength of $\bar{\tau}\nu_{\mu}\bar{q}q^{'}$ interactions are extracted from
the combined result of the NOMAD and CHORUS experiments on searching for
$\nu_{\mu} - \nu_{\tau}$ oscillations. Some of these bounds supersede limits
from rare decays. We also propose a ``missing energy'' type experiment
searching for $\mu - \tau$ conversion on nucleons. The experiment can be
performed at a present accelerator or at a future neutrino factory.


title: Multiparticle production and perturbative QCD

abstract:
  The perturbative quantum chromodynamics (QCD) is quite successful in the
description of main features of multiparticle production processes. Ten most
appealing characteristics are described in this brief review talk and compared
with QCD predictions. The general perturbative QCD approach is demonstrated and
its problems are discussed. It is shown that the analytical calculations at the
parton level with the low-momentum cut-off reproduce experimental data on the
hadronic final state surprisingly accurately even though the perturbative
expansion parameter is not very small. Moreover, the perturbative QCD has been
able not only to {\it describe} the existing data but also to {\it predict}
many new bright qualitative phenomena.


title:
Extracting the Flavour Structure of a Baryon-Number R-parity Violating
  Coupling at the LHC

abstract:
  The detection of the flavour content of jets produced from R-parity violating
neutralino decays is investigated in the case where one baryon-number violating
coupling dominates. Simulations are performed of the ATLAS experiment at the
LHC for all couplings, other than lambda"_tjk since neutralino decays through
these couplings are very suppressed. Secondary vertex distributions and muons
produced by heavy-quark (b- and c-) jets allow discrimination between LSP decay
modes. The dominant coupling can be identified at better than 3.5 sigma in
almost all cases, with the only remaining ambiguity caused by the inability to
distinguish strange from down quarks.


title: New Model for the QCD Analytic Running Coupling

abstract:
  As an elaboration of the analytic approach to Quantum Chromodynamics (QCD), a
new model for the QCD analytic running coupling is proposed. A self-evident
advantage of the new analytic running coupling (NARC) is that it incorporates
the infrared enhancement and the ultraviolet asymptotic freedom in a single
expression. It is essential that additional parameters are not introduced in
the theory. The absence of unphysical singularities in the physical region
$q^2>0$ and a fairly well loop and scheme stability are the remarkable features
of the NARC. By making use of practically the same values of $\Lambda_{QCD}$ in
the approach developed, one succeeded in description of various physical
phenomena, from quark confinement to the $\tau$ lepton decay. This undoubtedly
implies that the new analytic running coupling substantially involves both the
nonperturbative and the perturbative behavior of Quantum Chromodynamics.


title: Minijet transverse spectrum in high-energy hadron-nucleus collisions

abstract:
  Hadron-nucleus collisions at LHC energies are studied by including explicitly
semi-hard parton rescatterings in the collision dynamics. Under rather general
conditions, we obtain explicit formulae for the semi-hard cross-section and the
inclusive minijet transverse spectrum. As an effect of the rescatterings the
spectrum is lowered at small $p_t$ and is enhanced at relatively large
transverse momenta, the deformation being more pronounced at increasing
rapidity. Its study allows to test the proposed interaction mechanisms and
represents an important baseline to examine nucleus-nucleus collisions.


title: Does F2 need a hard pomeron?

abstract:
  We show that the latest HERA measurements of F2 are compatible with the
existence of a triple pole at J=1. Such a structure also accounts for soft
forward hadronic amplitudes, so that the introduction of a new singularity is
not necessary to describe DIS data.


title: Energy flow in QCD and event shape functions

abstract:
  Hadronization corrections to the thrust and related event shape distributions
in the two-jet kinematical region of e+e- annihilation are summarized by
nonperturbative shape functions. The moments of shape functions are given by
universal matrix elements in QCD, which describe the energy flow in QCD final
states. We show how the nonperturbative structure of these matrix elements may
be inferred from resummed perturbation theory and Lorentz invariance. This
analysis suggests the same functional forms for the shape functions as were
found in phenomenological studies, and sheds light on the physical significance
of the parameters that characterize these functions.


title: Probing the Planck Scale with Neutrino Oscillations

abstract:
  Quantum gravity "foam", among its various generic Lorentz non-invariant
effects, would cause neutrino mixing. It is shown here that, if the foam is
manifested as a nonrenormalizable effect at scale M, the oscillation length
generically decreases with energy $E$ as (E/M)^(-2). Neutrino observatories and
long-baseline experiments should have therefore already observed foam-induced
oscillations, even if M is as high as the Planck energy scale. The null
results, which can be further strengthened by better analysis of current data
and future experiments, can be taken as experimental evidence that Lorentz
invariance is fully preserved at the Planck scale, as is the case in critical
string theory.


title: Dissipative Dynamics of Inflation

abstract:
  Dissipative scalar quantum field theory is examined at zero temperature.
Estimates of radiation production are given. Relevance of the results to
supercooled and warm inflation are discussed.

categories: hep-ph astro-ph cond-mat.stat-mech gr-qc hep-th


title:
A gobal fit to the anomalous magnetic moment, b->s gamma and Higgs
  limits in the constrained MSSM

abstract:
  New data on the anomalous magnetic moment a_mu of the muon together with the
b->s gamma decay rate are considered within the supergravity inspired
constrained minimal supersymmetric model. We perform a global statistical chi^2
analysis of these data and show that the allowed region of parameter space is
bounded from below by the Higgs limit, which depends on the trilinear coupling
and from above by the anomalous magnetic moment a_mu. The newest b->s gamma
data deviate 1.7 sigma from recent SM calculations and prefer a similar
parameter region as the 2.6 sigma deviation from a_mu.


title:
The Fourth SM Family Enhancement to the Golden Mode at the Upgraded
  Tevatron

abstract:
  We study the observability for a Higgs boson at upgraded Tevatron via the
modes gg->h->ZZ->4l (l=e,mu). We find that the signal can be observed at an
integrated luminosity of 30 fb^(-1) if the fourth SM family exists.


title: Classical Initial Conditions for Nucleus-Nucleus Collisions

abstract:
  We present the results of an analytical calculation of the distribution of
gluons in the state immediately following a heavy ion collision in the
quasi-classical limit of QCD given by McLerran-Venugopalan model. We show that
the typical transverse energy Et of the produced gluons is of the order of the
saturation scale of the nuclei Qs, as predicted by Mueller. We demonstrate that
due to multiple rescatterings the obtained gluon distribution remains finite
(up to logarithms of k) in the soft transverse momentum limit of k << Q_s. We
compare the gluon spectrum in the single nuclear wave function before the
collision to the spectrum of the produced gluons. The total number of produced
gluons turns out to be proportional to the total number of gluons inside the
nuclear wave function before the collision with the proportionality coefficient
c = 2 ln 2.


title: TESLA Technical Design Report Part I: Executive Summary

abstract: The TESLA Technical Design Report Part I: Executive summary


abstract:
  The TESLA Technical Design Report Part III: Physics at an e+e- Linear
Collider


title: Resumming the color-octet contribution to radiative Upsilon decay

abstract:
  At the upper endpoint of the photon energy spectrum in Upsilon -> X gamma,
the standard NRQCD power counting breaks down and the OPE gives rise to
color-octet structure functions. Furthermore, in this kinematic regime large
Sudakov logarithms appear in the octet Wilson coefficients. The endpoint
spectrum can be treated consistently within the framework of a recently
developed effective field theory of collinear and soft particles. Here we show
that within this approach the octet structure functions arise naturally and
that Sudakov logarithms can be summed using the renormalization group
equations. We derive an expression for the resummed energy spectrum and, using
a model lightcone structure function, investigate the phenomenological
importance of the resummation.


title:
Accounting for running alpha_s for the non-singlet components of the
  structure functions F_1 and g_1 at small x

abstract: Talk given at 9th Workshop DIS 2001, Bologna, April,27 -May,1, 2001.


title: Higher twist corrections to the sum rule for semileptonic B decay

abstract:
  The sum rule for charmless inclusive semileptonic B-meson decays allows a
theoretically clean and experimentally efficient determination of |V_{ub}|. The
leading twist contribution to the sum rule is known in QCD. We compute higher
twist corrections to the sum rule using the heavy quark effective theory.


title:
A next-to-leading order QCD analysis of deeply virtual Compton
  scattering amplitudes

abstract:
  We present a next-to-leading order (NLO) QCD analysis of unpolarized and
polarized deeply virtual Compton scattering (DVCS) amplitudes, for two
different input scenarios, in the $\bar{MS}$ scheme. We illustrate and discuss
the size of the NLO effects and the behavior of the amplitudes in skewedness,
$\zeta$, and photon virtuality, $Q^2$. In the unpolarized case, at fixed $Q^2$,
we find a remarkable effective power-law behaviour in $\zeta$, akin to Regge
factorization, over several orders of magnitude in $\zeta$. We also quantify
the ratio of real to imaginary parts of the DVCS amplitudes and their
sensitivity to changes of the factorization scale.


title: Ultra High Energy Cosmic Ray, Superheavy Dark Matter and Extra Dimension

abstract:
  We propose a new mechanism for explaining the very long lifetime of
superheavy dark matter X, which is proposed as a source of the ultra
high-energy cosmic rays above the GZK cutoff (5 \times 10^{19} eV). The singlet
X particle couples to the MSSM particles only through a bulk singlet field
which develops the v.e.v. in the ``hidden'' brane. The distance between this
hidden brane and the ``visible'' brane naturally leads to the exponential
suppression of the coupling. The X particle decays predominantly into the
higgsino and higgs boson of the MSSM, and its decay spectrum is completely
determined once their properties are known.


title: Search for $a_0(980)$ and $f_0(980)$ mesons in $\phi\to\gamma K\bar K$

abstract:
  We study the decay $\phi\to\gamma K^+K^-$ taking into account the scalar
mesons production $\phi\to\gamma(f_0+a_0) \to\gamma K^+K^-$ and the final state
radiation. We note that the relative sign between the final state radiation
amplitude and the scalar meson production amplitude is fixed in the $K^+K^-$
loop model which describes data on the $\phi\to \gamma f_0\to\gamma\pi\pi$ and
$\phi\to\gamma a_0\to\gamma\pi\eta$ decays. As consequence this model predicts
the definite interference between the final state radiation and the scalar
resonance production amplitudes. We calculate the mass spectra of the
$\phi\to\gamma K^+K^-$ decay and the differential cross-sections for
$e^+e^-\to\phi\to\gamma K^+K^-$ and for $e^+e^-\to\phi\to\gamma K^0\bar K^0$
reactions.


title: Brane-skyrmions and wrapped states

abstract:
  In the context of a brane world and including an induced curvature term in
the brane action, we obtain the effective lagrangian for the Goldstone bosons
(branons) associated with the spontaneous breaking of the translational
invariance in the bulk. In addition to the branons, this effective action has
Skyrmion-like solitonic states which can be understood as holes in the brane.
We study their main properties such as mass and size, the Skyrmion-branon
interaction and their possible fermionic quantization. We also consider states
where the brane is wrapped around the extra dimensions and their relation with
the brane-skyrmions. Finally, we extend our results to higher-dimensional
branes, such as those appearing in M-theory, where brane-skyrmions could also
be present.


title: Hard colour singlet exchange at the Tevatron from the BFKL equation

abstract:
  We study rapidity gaps between jets in ppbar collisions at the Tevatron by a
novel solution of the nonforward BFKL equation including nonleading effects
through the consistency constraint and running coupling. Results differ from
earlier calculations based on the asymptotic Mueller-Tang formula, but agree
with D0 data when including full event simulation using PYTHIA to model the gap
survival probability.


title: Anderson Theorem for Color Superconductor

abstract:
  Ginzburg-Landau functional is derived for a system possessing both chiral and
diquark condensates. Anderson theorem for such a system is formulated and
proved.


title: Earth matter effects on the supernova neutrino spectra

abstract:
  We explore the earth matter effects on the energy spectra of neutrinos from a
supernova. We show that the observations of the energy spectra of $\nu_e$ and
$\bar{\nu}_e$ from a galactic supernova may enable us to identify the solar
neutrino solution, to determine the sign of $\Delta m^2_{32}$, and to probe the
mixing matrix element $|U_{e3}|^2$ to values as low as $10^{-3}$. We point out
scenarios in which the matter effects can even be established through the
observation of the spectrum at a single detector.


title:
Susy QCD and High Energy Cosmic Rays 1. Fragmentation functions of Susy
  QCD

abstract:
  The supersymmetric evolution of the fragmentation functions (or timelike
evolution) within N=1 $QCD$ is discussed and predictions for the fragmentation
functions of the theory (into final protons) are given. We use a backward
running of the supersymmetric DGLAP equations, using a method developed in
previous works. We start from the usual QCD parameterizations at low energy and
run the DGLAP back, up to an intermediate scale -assumed to be supersymmetric-
where we switch-on supersymmetry. From there on we assume the applicability of
an N=1 supersymmetric evolution (ESAP). We elaborate on possible application of
these results to High Energy Cosmic Rays near the GZK cutoff.


title: Probing MSSM Higgs Sector CP Violation at a Photon Collider

abstract:
  We study the phenomenological implications of the Higgs sector CP violation
at a photon collider. In our model, the CP violation is radiatively induced by
the non-trivial CP phases of the third-generation scalar-quark sector in the
MSSM. We re-evaluate the $s$-channel resonance production cross sections and
the polarization asymmetries of the neutral Higgs bosons based on the
calculation of the mass matrix of the neutral Higgs bosons which is valid for
any values of the relevant SUSY parameters. The CP properties of the Higgs
bosons can be precisely probed through their $s$-channel resonance productions
at a photon linear collider by exploiting circularly and/or linearly polarized
backscattered laser photons.


title: Strong and Weak CP Violation in Technicolor

abstract:
  I discuss vacuum alignment and CP violation in technicolor theories of
electroweak and flavor symmetry breaking. I review the surprising appearance of
rational phase solutions in the technifermion sector and propose a new solution
of the strong CP problem of quarks. I then discuss the sources of weak CP
violation, in both the CKM matrix and the suppressed extended technicolor and
topcolor--assisted technicolor interactions. It is easy to reproduce the
observed value of the neutral kaon CP-violating parameter epsilon from these
interactions.


title:
Twist-4 photon helicity-flip amplitude in DVCS on a nucleon in the
  Wandzura-Wilczek approximation

abstract:
  We computed twist-4 part of the photon spin-flip amplitude in deeply virtual
Compton scattering on a nucleon in the Wandzura-Wilczek approximation. We found
a factorizable contribution, which arises from photon scattering on quarks with
non-zero angular momentum along the collision axis. As the genuine twist-2
amplitude arises at the NLO, for moderate virtualities of the hard photon, $Q^2
\le 10$ GeV$^2$, kinematical twist-4 correction can give numerically important
contribution to the photon helicity-flip amplitude.


title: Heavy ion collision multiplicities and gluon distribution functions

abstract:
  Atomic number ($A$) and energy ($\roots$) scaling exponents of multiplicity
and transverse energy in heavy ion collisions are analytically derived in the
perturbative QCD + saturation model. The exponents depend on the small-$x$
behaviour of gluon distribution functions at an $x$-dependent scale. The
relation between initial state and final state saturation is also discussed.


title:
New constraints on ultrashort-ranged Yukawa interactions from atomic
  force microscopy

abstract:
  Models in which the gravitational and gauge interactions are unified at ~1
TeV lead to the possibility that large extra dimensions would produce
Yukawa-type corrections to the Newtonian gravitational law at small distances.
In some models with n = 3 extra dimensions, deviations from Newtonian gravity
would occur at separations ~5 nm, a distance scale accessible to an atomic
force microscope (AFM). Here we present constraints on the Yukawa corrections
derived from the latest AFM Casimir force measurement by Mohideen, et al. which
are up to 19 times stronger than those obtained from their previous experiment.
We then discuss new designs for AFM experiments which have the potential to
significantly improve upon these constraints.


title: Searches for new particles at LEP: a summary report

abstract: We review the progress made at LEP in the quest for new particles.


title: Rare charm meson decays D->Pl^+l^- and c->ul^+l^- in SM and MSSM

abstract:
  We study the nine possible rare charm meson decays D->Pl^+l^-
(P=pi,K,eta,eta') using the Heavy Meson Chiral Lagrangians and find them to be
dominated by the long distance contributions. The decay D^+ -> pi^+l^+l^- with
the branching ratio 1*10^(-6) is expected to have the best chances for an early
experimental discovery. The short distance contribution in the five Cabibbo
suppressed channels arises via the c->ul^+l^- transition; we find that this
contribution is detectable only in the D->pi l^+l^- decay, where it dominates
the differential spectrum at high-q^2. The general Minimal Supersymmetric
Standard Model can enhance the c->ul^+l^- rate by up to an order of magnitude;
its effect on the D->Pl^+l^- rates is small since the c->ul^+l^- enhancement is
sizable in low-q^2 region, which is inhibited in the hadronic decay.


title: New Cosmological and Experimental Constraints on the CMSSM

abstract:
  We analyze the implications of several recent cosmological and experimental
measurements for the mass spectra of the Constrained MSSM (CMSSM). We compute
the relic abundance of the neutralino and compare the new cosmologically
expected and excluded mass ranges with those ruled out by the final LEP bounds
on the lightest chargino and Higgs masses, with those excluded by current
experimental values of $\br(B\to X_s \gamma)$, and with those favored by the
recent measurement of the anomalous magnetic moment of the muon. We find that
for $tan\beta\lsim 45$ there remains relatively little room for the mass
spectra to be consistent with the interplay of the several constraints. On the
other hand, at larger values of $tan\beta\$ the decreasing mass of the
pseudoscalar Higgs gives rise to a wide resonance in the neutralino WIMP
pair-annihilation, whose position depends on the ratio of top and bottom quark
masses. As a consequence, the cosmologically expected regions consistent with
other constraints often grow significantly and generally shift towards
superpartner masses in the $\tev$ range.


title:
Hierarchy and Anarchy in Quark Mass Matrices, or Can Hierarchy Tolerate
  Anarchy?

abstract:
  The consequences of adding random perturbations (anarchy) to a baseline
hierarchical model of quark masses and mixings are explored. Even small
perturbations of the order of 5% of the smallest non-zero element can already
give deviations significantly affecting parameters of the
Cabibbo-Kobayashi-Maskawa (CKM) matrix, so any process generating the anarchy
should in general be limited to this order of magnitude. The regularities of
quark masses and mixings thus appear to be far from a generic feature of
randomness in the mass matrices, and more likely indicate an underlying order.


title: Probes Of Universal Extra Dimensions at Colliders

abstract:
  In the Universal Extra Dimensions model of Appelquist, Cheng and Dobrescu,
all of the Standard Model fields are placed in the bulk and thus have
Kaluza-Klein(KK) excitations. These KK states can only be pair produced at
colliders due to the tree-level conservation of KK number, with the lightest of
them being stable and possibly having a mass as low as $\simeq 350-400$ GeV.
After calculating the contribution to $g-2$ in this model we investigate the
production cross sections and signatures for these particles at both hadron and
lepton colliders. We demonstrate that these signatures critically depend upon
whether the lightest KK states remain stable or are allowed to decay by any of
a number of new physics mechanisms. These mechanisms which induce KK decays are
studied in detail.


title: Tau Neutrinos from Astrophysical and Cosmological Sources

abstract:
  Previous work on the neutrino spectra from high energy sources has not
included the tau neutrinos directly produced by the decays in the source. Here
we consider the tau neutrino component and discuss how its inclusion modifies
the expected neutrino spectra. We discuss implications for interpreting any
observed tau neutrino component in TeV - UHE events as evidence of nu_mu -->
nu_tau oscillations.


title: Expanding non homogeneous configurations of the $\lambda \phi^4$ model

abstract:
  A time dependent variational approach is considered to derive the equations
of movement for the $\lambda \phi^4$ model. The temporal evolution of the model
is performed numerically in the frame of the Gaussian approximation in a
lattice of 1+1 dimensions given non homogeneous initial conditions (like
bubbles) for the classical and quantum parts of the field which expands. A
schematic model for the initial conditions is presented considering the model
at finite fermionic density. The non zero fermionic density may lead either to
the restoration of the symmetry or to an even more asymmetric phase. Both kinds
of situations are considered as initial conditions and the eventual differences
in early time dynamics are discussed. In the early time evolution there is
strong energy exchange between the classical and quantum parts of the field as
the initial configuration expands. The contribution of the quantum fluctuations
is discussed especially in the strong coupling constant limit. The continuum
limit is analyzed.


title:
Probing an extended region of Delta m^2 with rapidly oscillating 7Be
  solar neutrinos

abstract:
  If 7Be solar neutrinos can be observed in real time experiments, then an
extended region of Delta m^2 can be probed by a proper analysis of the rapidly
changing phase of vacuum oscillations due to the eccentricity of the earth's
orbit about the sun. For the case of maximal vacuum mixing, a kind of Fourier
analysis of expected data for one year's time could uniquely pick out Delta m^2
if it lies in the region ~10^{-10} - 6 X 10^{-9} (eV)^2.


title:
The Physical Foundation of the Quark Model: the Quark Model as an
  approximation of the BCC Model

abstract:
  From the Dirac sea concept, the BCC model infers that the quarks u and d
constitute a body center cubic quark lattice in the vacuum; when a quark $q^*$
is excited from the vacuum, the nearest primitive cell u' and d' is
accompanying excited by the quark $q^*$. Using the energy band theory, the
model deduces the quantum numbers (I, S, C, b, and Q) and the masses of all
quarks using a united mass formula. Then, it shows that the system of} 3
excited quarks ($q^*u'd'$$) is a baryon, and it deduces the baryon spectrum in
terms of the sum laws. This theoretical baryon spectrum is in accordance with
the experimental results. It also shows that there are only two elementary
quarks (u and d), while the other quarks (s, c, b, ...) are the excited states
of the elementary quarks, hence the SU(3) (u, d, and s), the SU(4) (u, d, s,
and c), and the SU(5) (u, d, s, c, and b) are the natural extensions of the
SU(2) (u and d). The BCC model provides the physical foundation (quarks, SU(N)
groups, and that a baryon is made of 3 quarks) for the Quark Model. The Quark
Model is the SU(N) approximation of the BCC model. The confinement concept is
not needed in the BCC model, because it is replaced by the accompanying
excitation concept. The SU(N)} groups are also not} necessary, as they are
replaced by the body center cubic groups. We also predict some new baryons:
}$\Lambda(2560)$, $\Sigma_{C}(2280)$, $\Omega^{-}(3720)$,
$\Lambda_{C}^{+}(6600)$, $\Lambda_{b}^{0}(9960)$...


title: Direct Measurement of the Top Quark Charge at Hadron Colliders

abstract:
  We consider photon radiation in tbar-t events at the upgraded Fermilab
Tevatron and the CERN Large Hadron Collider (LHC) as a tool to measure the
electric charge of the top quark. We analyze the contributions of tbar-t-gamma
production and radiative top quark decays to p-p, pbar-p -> gamma l^+/- nu
bbar-b jj, assuming that both b-quarks are tagged. With 20~fb^{-1} at the
Tevatron, the possibility that the ``top quark'' discovered in Run I is
actually an exotic charge -4/3 quark can be ruled out at the 95% confidence
level. At the LHC, it will be possible to determine the charge of the top quark
with an accuracy of about 10%.


title:
Transverse Momentum Spectra of $J/\psi$ and $\psi^{\prime}$ Mesons from
  Quark Gluon Plasma Hadronization in Nuclear Collisions

abstract:
  Recent results on transverse mass spectra of $J/\psi$ and $\psi^{\prime}$
mesons in central Pb+Pb collisions at 158 A$\cdot$GeV are considered. It is
shown that those results support a hypothesis of statistical production of
charmonia at hadronization and suggest the early thermal freeze--out of
$J/\psi$ and $\psi^{\prime}$ mesons. Based on this approach the collective
transverse velocity of hadronizing quark gluon plasma is estimated to be
$<v^H_T> \approx 0.2$. Predictions for transverse mass spectra of hidden and
open charm mesons at SPS and RHIC are discussed.


title: Large Extra Dimensions from a Small Extra Dimension

abstract:
  Models with extra dimensions have changed our understanding of the hierarchy
problem. In general, these models explain the weakness of gravity by diluting
gravity in a large bulk volume, or by localizing the graviton away from the
standard model. In this paper, we show that the warped geometries necessary for
the latter scenario can naturally induce the large volumes necessary for the
former. We present a model in which a large volume is stabilized without
supersymmetry. We comment on the phenomenology of this scenario and
generalizations to additional dimensions.


title: Top-quark spin correlation at Linear Colliders with anomalous couplings

abstract:
  We investigate the feasibility of probing anomalous top-quark couplings of
$Wtb$, $Z t \bar{t}$, and $\gamma t \bar{t}$ in terms of an effective
Lagrangian with dimension-six operators at future $e^+e^-$ linear colliders
with a c. m. energy $\sqrt s \sim 500-800$ GeV. We first examine the
constraints on these anomalous couplings from the $Z\to b \bar{b}$ data at LEP
I and from unitarity considerations. We then consider in detail the effects of
anomalous couplings on $t \bar{t}$ spin correlations in the top-pair production
and decay with three spin bases: the helicity, beamline and off-diagonal bases.
Our results show that the polarized beams are more suitable for exploring the
effects of different new operators. For polarized beams, the helicity basis
yields the best sensitivity.


title:
Implications of the Pseudo-Scalar Higgs Boson in determining the
  Neutralino Dark Matter

abstract:
  In the framework of the Constrained Minimal Supersmmetric Standard Model
(CMSSM) we discuss the impact of the pseudo-scalar Higgs boson in delineating
regions of the parameters which are consistent with cosmological data and E821
data on the anomalous magnetic moment of muon. For large values of the
parameter $\tan \beta > 50$, cosmologically allowed corridors of large $m_0$,
$M_{1/2}$ are opened, due to the s-channel pseudo-scalar exchange in the pair
annihilation of the lightest of the neutralinos to $b \bar{b}$ or $\tau
\bar{\tau}$, which dominates in this region. However, no such corridors are
found for values $\tan \beta < 50 $. Combining cosmological and E821 data puts
severe upper limits on sparticle masses. We find that at LHC, but even at a
$e^{+}e^{-}$ linear collider with center of mass energy $\sqrt{s} = 800\GeV$,
such as TESLA, supersymmetry can be discovered, if it is based on the CMSSM.


title: A Vademecum on Quark-Hadron Duality

abstract:
  We present an elementary introduction to the problem of quark-hadron duality
and its practical limitations, in particular as it concerns local duality
violation in inclusive B meson decays. We show that the accurate definition of
duality violation elaborated over the recent years allows one to derive
informative constraints on violations of local duality. The magnitude of
duality violation is particularly restricted in the total semileptonic widths.
This explains its strong suppression in concrete dynamical estimates. We
analyze the origin of the suppression factors in a model-independent setting,
including a fresh perspective on the Small Velocity expansion. A new
potentially significant mechanism for violation of local duality in
\Gamma_sl(B) is analyzed. Yet we conclude that the amount of duality violation
in \Gamma_sl(B) must be safely below the half percent level, with realistic
estimates being actually much smaller. Violation of local duality in
\Gamma_sl(B) is thus far below the level relevant to phenomenology. We also
present a cautionary note on the B->D^* decay amplitude at zero recoil and show
that it is much more vulnerable to violations of quark-hadron duality than
\Gamma_sl(B). A critical review of some recent literature is given. We point
out that the presently limiting factor in genuinely model-independent
extraction of V_cb is the precise value of the short-distance charm quark mass.
We suggest a direct and precise experimental check of local quark-hadron
duality in semileptonic B->X_c l\nu decays.


title: Quenching of hadron spectra in media

abstract:
  We determine how the yield of large transverse momentum hadrons is modified
due to induced gluon radiation off a hard parton traversing a QCD medium. The
quenching factor is formally a collinear- and infrared-safe quantity and can be
treated perturbatively. In spite of that, in the $p_\perp$ region of practical
interest, its value turns out to be extremely sensitive to large distances and
can be used to unravel the properties of dense quark-gluon final states
produced in heavy ion collisions. We also find that the standard modelling of
quenching by shifting $p_\perp$ in the hard parton cross section by the mean
energy loss is inadequate.


title: QCD and Hadron Dynamics

abstract:
  Perturbative QCD predicts and describes various features of multihadron
production. An amazing similarity between observable hadron systems and
calculable underlying parton ensembles justifies the attempts to use the
language of quarks and gluons down to small momentum scales, to approach the
profound problems that are commonly viewed as being entirely non-perturbative.


title: On Calculation of the Neutron Charge Radius

abstract:
  We show that the anomalous quark magnetic moments and relativistic effects in
the nucleon wave function result in the correct value of the neutron charge
radius.


title: Sterile neutrino creating a reduced LSND effect

abstract:
  Although the hypothetic sterile neutrino $\nu_s$ is probably not involved
significantly in the deficits of solar $\nu_e$'s and atmospheric $\nu_\mu$'s,
it may cause the possible LSND effect. In fact, we face such a situation, when
the popular nearly bimaximal texture of active neutrinos $\nu_e$, $\nu_\mu$,
$\nu_\tau$ is perturbed through a small rotation in the 14 plane, where $\nu_4$
is the extra neutrino mass state induced by the sterile neutrino $\nu_s$. Then,
with $m^2_1\simeq m^2_2$ we predict in the simplest case of $s_{13}\to0$ that
$\sin^22\theta_{\rm LSND}=s^4_{14}/2$ and $\Delta m^2_{\rm LSND} = |\Delta
m^2_{41}|$. However, the negative CHOOZ experiment imposes on $s^4_{14}/2$ the
upper bound $1.3\times10^{-3}$, suggesting a reduction of the amplitude of
possible LSND effect.


title:
Particle spectrum in the modified NMSSM in the strong Yukawa coupling
  limit

abstract:
  A theoretical analysis of solutions of renormalisation group equations in the
MSSM corresponding to the quasi-fixed point conditions shows that the mass of
the lightest Higgs boson in this case does not exceed $94\pm 5\text{GeV}$. It
means that a substantial part of the parameter space of the MSSM is practically
excluded by existing experimental data from LEP II. In the NMSSM the upper
bound on the lightest Higgs boson mass reaches its maximum in the strong Yukawa
coupling regime, when Yukawa constants are considerably larger the gauge ones
on the Grand Unification scale. In this paper a particle spectrum in a simple
modification of NMSSM which leads to a self-consistent solution in the
considered region of the parameter space is studied. This model allows one to
get $m_h\sim 125\text{GeV}$ even for comparatively low values of $\tan\beta\ge
1.9$. For an analysis of the Higgs boson spectrum and neutralino spectrum a
method for diagonalisation of mass matrices proposed formerly is used. The mass
of the lightest Higgs boson in this model does not exceed $130.5\pm
3.5\text{GeV}$.


title:
Supersymmetric SO(10) GUT Models with Yukawa Unification and a Positive
  Mu Term

abstract:
  Supersymmetric grand unified models based on SO(10) gauge symmetry have many
desireable features, including the unification of Yukawa couplings. Using
D-term contributions to scalar masses arising from the breakdown of SO(10),
Yukawa coupling unification only to 30% can be achieved in models with a
positive superpotential Higgs mass. The superparticle mass spectrum is highly
constrained, and yields relatively light top squarks and charginos.
Surprisingly, the pattern of GUT scale soft SUSY breaking masses are close to
those found in the context of inverted hierarchy models. Our analysis supports
the idea that the low energy MSSM parameter space is an approximate SO(10)
inspired fixed point.


title: Background Enhancement of CPT Reach at an Asymmetric Phi Factory

abstract:
  Photoproduction of neutral-kaon pairs is studied from the perspective of CP
and CPT studies. Interference of the P and S waves, with the former due to
diffractive phi production and the latter to f_0/a_0 production, is shown to
enhance the CPT reach. Results are presented of Monte Carlo studies based on
rates expected in future experiments.


title:
Final-state interaction and s-quark helicity conservation in B -> J/psi
  K*

abstract:
  The Section of charm quark spin conservation is deleted since it involves
more dynamical assumptions than previously stated. A few comments are added in
view of new experimental results.


title: Upper Limit on the Higgs Particle Mass

abstract:
  It is shown that the effective Standard Model theory with the physical Higgs
mass lighter than $\sim 200$ GeV takes the form of an unbroken electroweak
theory already at moderately high, $O(1 TeV)$, energy scales. No such
transitional scale exists for the heavier Higgses. This result is independently
obtained by two standard regularization methods.


title: Comments on Non-Commutative Phenomenology

abstract:
  It is natural to ask whether non-commutative geometry plays a role in four
dimensional physics. By performing explicit computations in various toy models,
we show that quantum effects lead to violations of Lorentz invariance at the
level of operators of dimension three or four. The resulting constraints are
very stringent.


title: Invariant Operators in Collinear Effective Theory

abstract:
  We consider processes which produce final state hadrons whose energy is much
greater than their mass. In this limit interactions involving collinear
fermions and gluons are constrained by a symmetry, and we give a general set of
rules for constructing leading and subleading invariant operators. Wilson
coefficients C(mu,P) are functions of a label operator P, and do not commute
with collinear fields. The symmetry is used to reproduce a two-loop result for
factorization in B -> D pi in a simple way.


title: A proof of factorization for B -> D pi

abstract:
  We prove that the matrix elements of four fermion operators mediating the
decay B^0 -> D^+ \pi^- and B^- -> D^0 \pi^- factor into the product of a form
factor describing the B -> D transition and a convolution of a short distance
coefficient with the nonperturbative pion light-cone wave function. This is
shown to all orders in alpha_s, up to corrections suppressed by factors of
1/mb, 1/mc, and 1/E_pi. It is not necessary to assume that the pion state is
dominated by the q-qbar Fock state.