title: Two-loop virtual corrections to B --> X_s l^+ l^- in the standard model

abstract:
  We calculate O(alpha_s) two-loop virtual corrections to the differential
decay width dGamma(B --> X_s l^+ l^-)/ds, where s is the invariant mass squared
of the lepton pair. We also include those contributions from gluon
bremsstrahlung which are needed to cancel infrared and collinear singularities
present in the virtual corrections. Our calculation is restricted to the range
0.05 < s/m_b^2 < 0.25 where the effects from resonances are small. The new
contributions drastically reduce the renormalization scale dependence of
existing results for dGamma(B --> X_s l^+ l^-)/ds. For the corresponding
branching ratio (restricted to the above s-range) the renormalization scale
uncertainty gets reduced from +/- 13% to +/- 6.5%.


title: \pi\pi scattering

abstract:
  We demonstrate that, together with the available experimental information,
chiral symmetry determines the low energy behaviour of the $\pi\pi$ scattering
amplitude to within very small uncertainties. In particular, the threshold
parameters of the S-, P-, D- and F-waves are predicted, as well as the mass and
width of the $\rho$ and of the broad bump in the S-wave. The implications for
the coupling constants that occur in the effective Lagrangian beyond leading
order and also show up in other processes, are discussed. Also, we analyze the
dependence of various observables on the mass of the two lightest quarks in
some detail, in view of the extrapolations required to reach the small physical
masses on the lattice. The analysis relies on the standard hypothesis,
according to which the quark condensate is the leading order parameter of the
spontaneously broken symmetry. Our results provide the basis for an
experimental test of this hypothesis, in particular in the framework of the
ongoing DIRAC experiment: The prediction for the lifetime of the ground state
of a $\pi^+\pi^-$ atom reads $\tau=(2.90\pm 0.10)10^{-15} sec$.


title:
Soft Gluon Resummation in Transverse Momentum Space for Electroweak
  Boson Production at Hadron Colliders

abstract:
  The distribution of W and Z bosons produced with small transverse momentum
(pt) at hadron colliders receives important contributions from large logarithms
arising from soft gluon emission. Although conventionally the all-orders
resummation of these `Sudakov' logarithms is performed in impact parameter
(Fourier transform) space, pt-space resummation is also possible, and offers
certain advantages.We present a detailed phenomenological analysis of W and Z
production at small pt at the Tevatron $p \bar p$ collider, using pt-space
resummation. A good description of the CDF and D0 data can be obtained provided
a significant non-perturbative contribution is included. We also present
predictions for the LHC.


title: Gold-plated processes at photon colliders

abstract:
  We review the most important topics and objectives of the physics program of
the gamma-gamma, gamma-electron collider (photon collider) option for an e+e-
linear collider.


title: Jet Photoproduction at THERA

abstract:
  We demonstrate that a future high-energy electron-proton collider like THERA
could largely extend the current HERA program in jet photoproduction of testing
QCD and determining the partonic structure of the proton and the photon.
Depending on the electron beam energy (250-500 GeV) and the collider mode ($ep$
or $\gamma p$), the range in the hard transverse energy scale of the jets could
be increased by a factor of 2-3 and the reach in the momentum fraction $x$ of
the partons in the proton or photon by at least one order of magnitude. It
would thus become possible to check the determinations of the gluon density in
the proton obtained in deep-inelastic scattering experiments, to measure the
gluon density in the photon down to low values of $x$, and to study the QCD
dynamics in multi-jet events.


title: Transport theory for a two-flavor color superconductor

abstract:
  QCD with two light quark flavors at high baryonic density and low temperature
is a color superconductor. The diquark condensate partially breaks the SU(3)
gauge symmetry down to an SU(2) subgroup. We study thermal fluctuations of the
superconductor for temperatures below the gap. These are described by a simple
transport equation, linked to a quasiparticle behavior of the thermal
excitations of the condensate. When solved in the collisionless limit and close
to equilibrium, it gives rise to the ``hard superconducting loop'' (HSL)
effective theory for the unbroken SU(2) gauge fields with momenta smaller than
the gap. This theory describes Debye screening and Landau damping of the gauge
fields in the presence of the diquark condensate. We also explain how our
effective theory follows to one-loop order from quantum field theory. Our
approach provides a convenient starting point for the computation of transport
coefficients of the two-flavor color superconductor.


title:
Effect of the scalar condensate on the linear gauge field response in
  the Abelian Higgs model

abstract:
  The effective equations of motion for low-frequency mean gauge fields in the
Abelian Higgs model are investigated in the presence of a scalar condensate,
near the high temperature equilibrium. We determine the current induced by an
inhomogeneous background gauge field in the linear response approximation up to
order $e^4$, assuming adiabatic variation of the scalar fields. The physical
degrees of freedom are found and a physical gauge choice for the numerical
study of the combined Higgs+gauge evolution is proposed.


title: Impact of a Light Strange-Beauty Squark on B_s Mixing and Direct Search

abstract:
  If one has Abelian flavor symmetry, $s_R$-$b_R$ mixing could be near maximal.
This can drive a "strange-beauty" squark ($\widetilde{sb}_{1}$) to be rather
light, but still evade the $b\to s\gamma$ constraint. Low energy constraints
imply that all other superpartners are at TeV scale, except for a possibly
light neutralino, $\widetilde \chi_1^0$. Whether light or heavy, the
$\widetilde{sb}_{1}$ can impact on the $B_s$ system: $\Delta m_{B_s}$ and
indirect CP phase, even for $B_s \to \phi\gamma$. Direct search is similar to
usual $\tilde b \to b\widetilde \chi_1^0$, but existing bounds are weakened by
$\widetilde{sb}_{1} \to s\widetilde \chi_1^0$ possibility. All these effects
could be studied soon at the Tevatron.


title: Low-Energy Supersymmetry and its Phenomenology

abstract:
  The structure of low-energy supersymmetric models of fundamental particles
and interactions is reviewed, with an emphasis on the minimal supersymmetric
extension of the Standard Model (MSSM) and some of its variants. Various
approaches to the supersymmetry-breaking mechanism are considered. The
implications for the phenomenology of Higgs bosons and supersymmetric particles
at future colliders are discussed.


title: Seesaw tau lepton mass and calculable neutrino masses in a 3-3-1 model

abstract:
  In a version of the 3-3-1 model proposed by Duong and Ma the introduction of
the scalar sextet for giving mass to the charged leptons is avoided by adding a
singlet charged lepton. We show that in this case the $\tau$ lepton gains mass
through a seesaw--like mechanism. Besides we show how to generate neutrino
masses at the tree and at the 1-loop level with the respective
Maki-Nakagawa-Sakata leptonic mixing matrices.


title: Dark Matter Constraints in Heterotic M-Theory with Five-Brane Dominance

abstract:
  The phenomenological implications of the M-theory limit in which
supersymmetry is broken by the auxiliary fields of five-brane moduli is
investigated.
  Assuming that the lightest neutralino provides the dark matter in the
universe, constraints on the sparticle spectrum are obtained. Direct detection
rates for dark matter are estimated.


title: Equilibration in an Interacting Field Theory

abstract:
  We use a combination of perturbation theory and numerical techniques to study
the equilibration of two interacting fields which are initially at thermal
equilibrium at different temperatures. Using standard rules of quantum field
theory, we examine the master equations that describe the time evolution of the
distribution functions for the two coupled systems. By making a few reasonable
assumptions we reduce the resulting coupled integral/differential equations to
a pair of differential equations that can be solved numerically. Our results
show with good accuracy how these coupled systems approach a common equilibrium
temperature.


title: Instanton interactions in dense-matter QCD

abstract:
  A Coulomb gas representation of dense-matter QCD is derived from a dual
transformation of the low-energy effective Lagrangian. The point-like charges
Q=+1,-1 of the gas are identified with the instantons and anti-instantons of
such topological charges. An instanton repels another instanton with the same
force as it attracts an anti-instanton, in contrast to the semiclassical
interaction.


title: Analysis of SU(3)_c X SU(3)_L X U(1)_X local gauge theory

abstract:
  Six different models, straightforward extensions of the standard model to
SU(3)_c X SU(3)_L X U(1)_X, which do not contain particles with exotic electric
charges are described. Two of the models are one family and four are three
family models. In two of the three family models one of the families transforms
different from the others, and in the other two all the three families are
different.


title: Analytic Confinement and Regge Trajectories

abstract:
  A simple relativistic quantum field model with the Yukawa-type interaction is
considered to demonstrate that the analytic confinement of the constituent
("quarks") and carrier ("gluons") particles explains qualitatively the basic
dynamical properties of the spectrum of mesons considered as two-particle
stable bound states of quarks and gluons: the quarks and gluons are confined,
the glueballs represent bound states of massless gluons, the masses of mesons
are larger than the sum of the constituent quark masses and the Regge
trajectories of mesonic orbital excitations are almost linear.


title:
On the Manifestation of Chiral Symmetry in Nuclei and Dense Nuclear
  Matter

abstract:
  This article reviews our view on how chiral symmetry, its pattern of breaking
and restoration under extreme conditions manifest themselves in the nucleon,
nuclei, nuclear matter and dense hadronic matter. Topics treated are nucleon
structure in terms of chiral symmetry, "first-principle" (QCD) calculations of
the properties of finite nuclei effectuated by embedding the ``standard nuclear
physics approach" into the framework of effective field theories of nuclei with
predictions for certain astrophysical processes, a reinterpretation of the
Brown-Rho (BR) scaling that implements chiral symmetry property of baryon-rich
medium \`a la "vector manifestation" of hidden local symmetry, evidences for BR
scaling in nuclear processes at normal nuclear matter density and at higher
density, the notion of "broadband equilibration" in heavy-ion processes, and
the role of strangeness in the formation of compact stars and their collapse
into black-holes. We revisit the "Cheshire-Cat phenomenon" recently revived in
the form of "quark-hadron continuity" in mapping low-density structure of
hadrons to high-density structure of quarks and gluons and suggest how
color-flavor locking in terms of QCD variables and hidden local symmetry in
terms of hadronic variables may be connected and how BR scaling could fit into
this "continuity" scheme.


title: The Randall-Sundrum Scenario with an Extra Warped Dimension

abstract:
  We investigate a scenario with two four-branes embedded in six dimensions.
When the metric is periodic and compact in one of the dimensions parallel to
the branes, the value of the effective cosmological constant for the remaining
five dimensions can assume a variety of values, determined by the dependence of
the metric on the sixth dimension. The picture that emerges resembles the
Randall-Sundrum model but with an extra warped dimension that allows the usual
brane-bulk fine tuning to be satisfied without finely tuning any of the
parameters in the underlying six dimensional theory. Although the action
contains terms with four derivatives of the metric, we show that when the
branes have a finite, natural thickness, such terms have only a small effect on
the Randall-Sundrum structure. The presence of these four derivative terms also
allows a configuration that resembles that produced by a domain wall but which
results from gravity alone.


title: Graviton loops and brane observables

abstract:
  We discuss how to consistently perform effective Lagrangian computations in
quantum gravity with branes in compact extra dimensions. A reparametrization
invariant and infrared finite result is obtained in a non trivial way. It is
crucial to properly account for brane fluctuations and to correctly identify
physical observables. Our results correct some confusing claims in the
literature. We discuss the implications of graviton loops on electroweak
precision observables and on the muon g-2 in models with large extra
dimensions. We model the leading effects, not controlled by effective field
theory, by introducing a hard momentum cut-off.


title: Anomalous magnetic moment of the muon in the two Higgs doublet model

abstract:
  We calculate the new physics effects on the anomalous magnetic moment of the
muon in the framework of the two Higgs doublet model. We predict an upper bound
for the lepton flavor violating coupling, which is responsible for the point
like interaction between muon and tau, by using the uncertainty in the
experimental result of the muon anomalous magnetic moment. We show that the
upper bound predicted is more stringent compared to the one which is obtained
by using the experimental result of the muon electric dipole moment


title: A compendium of light-cone quantization

abstract:
  For the purpose of consistent notation and easy reference the most important
relations in light-cone quantization are compiled from a recent review
(Brodsky, Pauli Pinsky, Physics Reports 301 (1998) 299), where all further
details and derivations can be found. Some further typos are removed.


title: Applying the flow equations to QCD

abstract:
  The effective quark-antiquark-interaction is derived from Lagrangian QCD in
the front form by means of the flow equations. It coincides with previous
results.


title:
On the effective light-cone QCD-Hamiltonian: Application to the pion and
  other mesons

abstract:
  The effective interaction between a quark and an anti-quark as obtained
previously with by the method of iterated resolvents is replaced by the
up-down-model and applied to flavor off-diagonal mesons including the positive
pion. The only free parameters are the canonical ones, the coupling constant
and the masses of the quarks.


title: Do neutrino oscillations allow an extra phenomenological parameter?

abstract:
  The quantity $\xi$ introduced recently in the phenomenological description of
neutrino oscillations is in fact not a free parameter, but a fixed number.


title:
Measuring $D^0-\bar D^0$ Mixing and Relative Strong Phases at a Charm
  Factory

abstract:
  We propose a set of measurements at a charm factory to determine the
$D^0-\bar D^0$ mixing parameters $\Delta M$ and $\Delta\Gamma$ and the strong
phase difference $\delta$ between doubly-Cabibbo-suppressed (DCS) and
Cabibbo-favored (CF) neutral $D$ decays into $K^-\pi^+$. The method can also be
used to measure strong phase differences between other corresponding DCS and CF
amplitudes. These phase differences are important for studies of $D^0$--$\bar
D^0$ mixing.


title: A Dynamical Principle For 3D-4D Interlinkage In Salpeter-like Equations

abstract:
  The half-century old Markov-Yukawa Transversality Principle ($MYTP$) which
provides a theoretical rationale for the covariant instantaneous approximation
($CIA$) that underlies all Salpeter-like equations, is generalized to a
covariant null-plane ansatz ($CNPA$). A common characteristic of both
formulations is an exact 3D-4D interlinkage of BS amplitudes which facilitates
a two-tier description: the 3D form for spectroscopy, and the 4D form for
transition amplitudes as 4D loop integrals. Some basic applications of $MYTP$
on the covariant null plane (quark mass function, vacuum condensates, and decay
constants) are given on the lines of earlier applications to these processes
under $CIA$.
  PACS: 03.65.-w ; 03.65.Co ; 11.10.Qr ; 11.10.St
  Keywords: Markov-Yukawa Transversality Principle ($MYTP$); Salpeter-like eqs;
Cov Instantaneity Ansatz ($CIA$); Cov Null-Plane Ansatz ($CNPA$); 3D-4D
interlinkage; Vertex function; 4D loops


title: Isotropy and Stability of the Brane

abstract:
  We reexamine Wald's no-hair theorem for global anisotropy in the brane world
scenarios. We derive a set of sufficient conditions which must be satisfied by
the brane matter and bulk metric so that a homogeneous and anisotropic brane
asymptotically evolves to a de Sitter spacetime in the presence of a positive
cosmological constant on the brane. We discuss the violations of these
sufficient conditions and we show that a negative nonlocal energy density or
the presence of strong anisotropic stress (i.e., a magnetic field) may lead the
brane to collapse. We discuss the generality of these conditions.


title: The flavour asymmetry of polarized anti-quarks in the nucleon

abstract:
  We present a study of the flavour asymmetry of polarized anti-quarks in the
nucleon using the meson cloud model. We include contributions both from the
vector mesons and the interference terms of pseudoscalar and vector mesons.
Employing the bag model, we first give the polarized valence quark distribution
of the $\rho$ meson and the interference distributions. Our calculations show
that the interference effect mildly increases the prediction for $\Delta
\dbar(x)-\Delta \ubar(x)$ at intermediate $x$ region. We also discuss the
contribution of `Pauli blocking' to the asymmetry.


title: Non-exponential decays and nonextensivity

abstract:
  We demonstrate that non-exponential decays of unstable systems can be
understood as yet another example of nonextensivity encountered in many
physical systems and as such can be characterized by the nonextensivity
parameter q.


title: After bulky brane inflation

abstract:
  Reheating or entropy production on the three-brane from a decaying bulk
scalar field is studied in the brane-world picture of the Universe. It is shown
that a significant amount of dark radiation is produced in this process unless
only the specific modes are excited, so that subsequent entropy production
within the brane is required in general before primordial nucleosynthesis.


title: Tau Polarizations in the Three-body Slepton Decays with Stau as the NLSP

abstract:
  In the gauge-mediated supersymmetry breaking models with scalar tau as the
next-to-lightest supersymmetric particle, a scalar lepton may decay dominantly
into its superpartner, tau lepton, and the lightest scalar tau particle. We
give detailed formulas for the three-body decay amplitudes and the polarization
asymmetry of the outgoing tau lepton . We find that the tau polarizations are
sensitive to the model parameters such as the stau mixing angle, the neutralino
to slepton mass ratio and the neutralino mixing effect.


title: An Improved Parton Shower algorithm in QED

abstract:
  An improved QED Parton Shower algorithm to calculate photonic radiative
corrections to QED processes at flavour factories is described. We consider the
possibility of performing photon generation in order to take into account also
the effects due to interference between initial and final state radiation.
Comparisons with exact order $\alpha$ results are shown and commented.


title: Producing massive sterile neutrinos as warm Dark Matter

abstract:
  This paper has been withdrawn by the authors.
  This paper started with a wrong term describing elastic scattering. The
correct form of the kinetic equations for the density matrix are derived e.g.
in A. Dolgov, Yad. Fiz. 33 (1981) 1309; K. Enqvist, K. Kainulainen and J.
Maalampi, Nucl. Phys. B 349 (1991) 754; G. Sigl and G. Raffelt, Nucl. Phys. B
406 (1993) 423. When using the correct form of the kinetic equations, the
result is in good agreement with old results, A. Dolgov and S. Hansen,
hep-ph/0009083.


title: QCD-based pion distribution amplitudes confronting experimental data

abstract:
  We use QCD sum rules with nonlocal condensates to re-calculate more
accurately the moments and their confidence intervals of the twist-2 pion
distribution amplitude including radiative corrections. We are thus able to
construct an admissible set of pion distribution amplitudes which define a
reliability region in the $a_{2}$, $a_{4}$ plane of the Gegenbauer polynomial
expansion coefficients. We emphasize that models like that of Chernyak and
Zhitnitsky, as well as the asymptotic solution, are excluded from this set. We
show that the determined $a_{2}$, $a_{4}$ region strongly overlaps with that
extracted from the CLEO data by Schmedding and Yakovlev and that this region is
also not far from the results of the first direct measurement of the pion
valence quark momentum distribution by the Fermilab E791 collaboration.
Comparisons with recent lattice calculations and instanton-based models are
briefly discussed.


title: Direct CP Asymmetry of B -> X_d \gamma in the effective SUSY model

abstract:
  We investigate the effect of supersymmetric CP violating phases on the
inclusive decay B\to X_d\gamma. Although such a decay contains a large
background from B\to X_s\gamma, if isolated it may exhibit sizeable CP
violation, both in the Standard Model (SM) and in the context of models beyond
the SM. With unconstrained supersymmetric CP violating phases we show that the
direct CP asymmetry (A_CP) lies in the region -40% \le A_CP \le 40%, where a
positive asymmetry would constitute a clear signal of physics beyond the SM.
Even if a direct measurement of B\to X_d\gamma proves too dif ficult
experimentally, its asymmetry contributes non-negligibly to the measurements of
A_CP for B\to X_s\gamma, and thus should be included in future analyses. We
show t hat there may be both constructive and destructive interference between
A^d\gamma_CP and A^s\gamma_CP.


title: Exploring New Physics in the $B\to \phi K$ System

abstract:
  Employing the SU(2) isospin symmetry of strong interactions and estimates
borrowed from effective field theory, we explore the impact of new physics on
the decays $B^\pm\to \phi K^\pm$ and $B_d\to \phi K_S$ in a model-independent
manner. To this end, we introduce - in addition to the usual mixing-induced CP
asymmetry in $B_d\to \phi K_S$ - a set of three observables, which may not only
provide smoking-gun signals for new-physics contributions to different isospin
channels, but also valuable insights into hadron dynamics. Imposing dynamical
hierarchies of amplitudes, we discuss various patterns of these observables,
including also scenarios with small and large rescattering processes. Whereas
the $B\to\phi K$ system provides, in general, a powerful tool to search for
indications of new physics, there is also an unfortunate case, where such
effects cannot be distinguished from those of the Standard Model.


title:
Heavy quark production via supersymmetric interaction at a neutrino
  factory

abstract:
  We investigate b-quark production in both charged and neutral current
channels through neutrino-nucleon scattering at a neutrino factory, mediated by
the lepton flavour violating interactions present in a supersymmetric theory
with broken R-parity. Using values of the effctive interaction strengths well
below the current and projected experimental bounds, we are still able to
predict markedly enhanced event rates, especially for the neutral current
events which are not allowed at the lowest order in the standard model (SM).
Data from neutrino factories can therefore be used to probe strengths of such
interactions to considerably higher precision than what can be envisioned in
other experiments.


title: Non-singlet structure functions beyond the next-to-next-to leading order

abstract:
  We study the evolution of the flavour non-singlet deep-inelastic structure
functions F_{2,NS} and F_3 at the next-to-next-to-next-to-leading order (N^3LO)
of massless perturbative QCD. The present information on the corresponding
three-loop coefficient functions is used to derive approximate expressions of
these quantities which prove completely sufficient for values x > 10^{-2} of
the Bjorken variable. The inclusion of the N^3LO corrections reduces the
theoretical uncertainty of alpha_s determinations from non-singlet scaling
violations arising from the truncation of the perturbation series to less than
1%. We also study the predictions of the soft-gluon resummation, of
renormalization-scheme optimizations by the principle of minimal sensitivity
(PMS) and the effective charge (ECH) method, and of the Pade' summation for the
structure-function evolution kernels. The PMS, ECH and Pade' approaches are
found to facilitate a reliable estimate of the corrections beyond N^3LO.


title:
Thermal versus Direct $J/\Psi$ Production in Ultrarelativistic Heavy-Ion
  Collisions

abstract:
  The production of $J/\Psi$ mesons in central collisions of heavy nuclei is
investigated as a function of collision energy. Two contributions are
considered simultaneously: early (hard) production coupled with subsequent
suppression in a Quark-Gluon Plasma, as well as thermal recombination of
primordially produced $c$ and $\bar c$ quarks at the hadronization transition.
Whereas the former still constitutes the major fraction of the observed
$J/\Psi$ abundance at SpS energies, the latter dominates the yield at RHIC. The
resulting excitation function for the number of $J/\Psi$'s over open charm
pairs exhibits nontrivial structure around $\sqrt{s} \simeq 30$ AGeV, evolving
into a significant rise towards maximal RHIC energy. We study this feature
within different (thermal) scenarios for $J/\Psi$ suppression, including
parton-induced quasifree destruction as a novel mechanism.


title: Gauge Unification in Higher Dimensions

abstract:
  A complete 5-dimensional SU(5) unified theory is constructed which, on
compactification on the orbifold with two different Z_2's (Z_2 and Z_2'),
yields the minimal supersymmetric standard model. The orbifold accomplishes
SU(5) gauge symmetry breaking, doublet-triplet splitting, and a vanishing of
proton decay from operators of dimension 5. Until 4d supersymmetry is broken,
all proton decay from dimension 4 and dimension 5 operators is forced to vanish
by an exact U(1)_R symmetry. Quarks and leptons and their Yukawa interactions
are located at the Z_2 orbifold fixed points, where SU(5) is unbroken. A new
mechanism for introducing SU(5) breaking into the quark and lepton masses is
introduced, which originates from the SU(5) violation in the zero-mode
structure of bulk multiplets. Even though SU(5) is absent at the Z_2' orbifold
fixed point, the brane threshold corrections to gauge coupling unification are
argued to be negligibly small, while the logarithmic corrections are small and
in a direction which improves the agreement with the experimental measurements
of the gauge couplings. Furthermore, the X gauge boson mass is lowered, so that
proton decay to e^+ \pi^0 is expected with a rate within about one order of
magnitude of the current limit. Supersymmetry breaking occurs on the Z_2'
orbifold fixed point, and is felt directly by the gauge and Higgs sectors,
while squarks and sleptons acquire mass via gaugino mediation, solving the
supersymmetric flavor problem.


title: Neutrino-Lepton Masses, Zee Scalars and Muon g-2

abstract:
  Evidence for neutrino oscillations is pointing to the existence of tiny but
finite neutrino masses. Such masses may be naturally generated via radiative
corrections in models such as the Zee model where a singlet Zee-scalar plays a
key role. We minimally extend the Zee model by including a right-handed singlet
neutrino \nu_R. The radiative Zee-mechanism can be protected by a simple U(1)_X
symmetry involving only the \nu_R and a Zee-scalar. We further construct a
class of models with a single horizontal U(1)_FN (a la Frogatt-Nielsen) such
that the mass patterns of the neutrinos and leptons are naturally explained. We
then analyze the muon anomalous magnetic moment (g-2) and the flavor changing
\mu --> e\gamma decay. The \nu_R interaction in our minimal extension is found
to induce the BNL g-2 anomaly, with a light charged Zee-scalar of mass 100-300
GeV.


title: Muon Anomalous Magnetic Moment (g-2)_mu and the Randall-Sundrum Model

abstract:
  We study the effects of the Kaluza-Klein gravitons in the Randall-Sundrum
model on the recent BNL measurements of the muon (g-2) deviation from the
standard model prediction. By examining the J-partial wave unitarity bounds of
the elastic process gamma+gamma->gamma+gamma, the cut-off on the number of
massive KK gravitons, n_c, has been introduced. We found that the recently
measured (Delta a_mu) can be accommodated in the RS model, within the natural
parameter space allowed by the perturbative unitarity. For example, dozens
(hundreds) of the n_c for Lambda_pi=1-2 TeV (3 TeV) can explain the reported
Delta a_mu.


title:
The graceful exit from the anomaly-induced inflation: Supersymmetry as a
  key

abstract:
  The stable version of the anomaly-induced inflation does not need a fine
tuning and leads to sufficient expansion of the Universe. The non-stable
version (Starobinsky model) provides the graceful exit to the FRW phase. We
indicate the possibility of the inflation which is stable at the beginning and
unstable at the end. The effect is due to the soft supersymmetry breaking and
the decoupling of the massive sparticles at low energy.


title:
The Meson Mass Spectrum from a Systematically Renormalized Light-Front
  Hamiltonian

abstract:
  We extend a systematic renormalization procedure for quantum field theory to
include particle masses and present several applications. We use a Hamiltonian
formulation and light-front quantization because this may produce a convergent
Fock-space expansion. The QCD Hamiltonian is systematically renormalized to
second order in the strong coupling and the Fock-space expansion is truncated
to lowest order to produce a finite-dimensional Hamiltonian matrix. The
renormalized Hamiltonian is used to calculate the spectra of the $b\bar{b}$ and
$c\bar{c}$ mesons as a lowest-order test of our procedure for full QCD.
  The analytic determination of the renormalized Hamiltonian matrix generates
expressions that must be numerically integrated to generate quantitative
results. The efficiency of the numerical calculation depends on how well the
basis functions can approximate the real state. We examine the effectiveness of
using Basis-Splines (B-Splines) to represent QCD states. After briefly
describing these functions, we test them using the one- and two-dimensional
harmonic oscillator problems. We test their ability to represent realistic
wavefunctions by using them to find the glueball mass spectrum.
  An efficient algorithm for numerically calculating the matrix elements in the
glueball and meson problems is necessary because the calculation is numerically
intensive. We describe our algorithm and discuss its parallel-cpu
implementation.


title: Cosmological Evolution of Global Monopoles

abstract:
  We investigate the cosmological evolution of global monopoles in the
radiation dominated (RD) and matter dominated (MD) universes by numerically
solving field equations of scalar fields. It is shown that the global monopole
network relaxes into the scaling regime, unlike the gauge monopole network. The
number density of global monopoles is given by $n(t) \simeq (0.43\pm0.07) /
t^{3}$ during the RD era and $n(t) \simeq (0.25\pm0.05) / t^{3}$ during the MD
era. Thus, we have confirmed that density fluctuations produced by global
monopoles become scale invariant and are given by $\delta \rho \sim 7.2(5.0)
\sigma^{2} / t^{2} $ during the RD (MD) era, where $\sigma$ is the breaking
scale of the symmetry.


title: Exclusive Hadronic Processes and Color Transparency

abstract:
  We review the current status of high energy exclusive processes and color
transparency.


title: Excited electron contribution to the e+e- -> \gamma\gamma cross-section

abstract:
  The differential cross-section for the process e+e- -> \gamma\gamma is
calculated assuming the presence of excited electrons with a chiral magnetic
coupling. This calculation permits constraining the excited electron coupling
using the same theoretical framework as the one generally used for direct
production searches.


title: Exclusive Decays of $B\to K^{(*)}l^+l^-$ in the PQCD

abstract:
  We study the exclusive decays of $B\to K^{(*)}l^+l^-$ within the framework of
the PQCD. We obtain the form factors for the $B\to K^{(*)}$ transitions in all
allowed values of $q^2$, which agree with the lattice results. We find that our
distributions of the decay rates and leptonic asymmetries are consistent with
that given in the other QCD models in the literature.


title:
Single Diffractive Lambda_c^+ Production in Polarized pp Scattering with
  Polarized Gluon Distribution in the Proton

abstract:
  Based on the hard-scattering factorization which decomposes the diffractive
structure function into a pomeron flux and a pomeron structure function, we
study the single diffractive Lambda_c^+ production in polarized pp scattering:
p + p -> p + Lambda_c^+ + X, which will be observed at forthcoming RHIC
experiment. By analyzing the cross section and correlation of the spin
polarization between the initial proton and produced Lambda_c^+, we found that
the process is quite effective for testing both hard-scattering factorization
and models of the polarized gluon distribution in the proton.


title: The processes gamma gamma to Z H in SM and MSSM

abstract:
  The process gamma gamma to ZH first arises at the 1-loop level, and as such
it provides remarkable tests of the structure of the electroweak Higgs sector.
These tests are complementary to those in the gauge sector involving gamma
gamma to gamma gamma, gamma Z, ZZ. We show that in the Standard Model (SM)
where H=H_{SM}, as well as in the supersymmetric case where H=h^0, H^0 or A^0,
observables exist (like e.g. the energy dependence, angular distribution,
photon polarization dependence or final Z polarization) which present rather
spectacular properties. Such properties involve strong threshold effects with
steps, bumps or peaks, reflecting the type of Higgs and heavy quarks and
chargino masses and couplings predicted by the SM and supersymmetric models.


title:
Helicity and Transversity Distribution of Nucleon and $\Lambda$-Hyperon
  from $\Lambda$ Fragmentation

abstract:
  It is shown that $\Lambda$-hyperon fragmentation in charged lepton deep
inelastic scattering (DIS) on a polarized nucleon target can provide sensitive
information concerning the quark helicity and transversity distributions for
both nucleon and $\Lambda$-hyperon at large $x$. Numerical predictions are
given for the spin transfers of the produced $\Lambda$, when the target nucleon
is polarized either longitudinally or transversely, and with the nucleon and
$\Lambda$ quark distributions evaluated both in an SU(6)
quark-spectator-diquark model and in a perturbative QCD (pQCD) based model. It
is also shown that the predicted spin transfers have different behaviors for
proton and neutron targets, and this can provide sensitive tests of different
predictions for the quark helicity and transversity distributions of the $d$
valence quark of the proton at large $x$.


title: Spin-Dependent Structure Functions of Real and Virtual Photons

abstract:
  The implications of the positivity constraint, $|g_1^{\gamma(P^2)}(x,Q^2)|
\leq F_1^{\gamma(P^2)}(x,Q^2)$, on the presently unknown spin--dependent
structure function $g_1^{\gamma(P^2)}(x,Q^2)$ of real and virtual photons are
studied at scales $Q^2\gg P^2$ where longitudinally polarized photons dominate
physically relevant cross sections. In particular it is shown how to implement
the physical constraints of positivity and continuity at $P^2=0$ in NLO
calculations which afford a nontrivial choice of suitable (DIS) factorization
schemes related to $g_1^{\gamma}$ and $F_1^{\gamma}$ and appropriate boundary
conditions for the polarized parton distributions of real and virtual photons.
The predictions of two extreme `maximal' and `minimal' saturation scenarios are
presented and compared with results obtained within the framework of a simple
quark `box' calculation expected to yield reasonable estimates in the not too
small regions of $x$ and $P^2$.


title: Heavy quark production in the semihard QCD approach at THERA

abstract:
  In the framework of the semihard ($k_T$ factorization) QCD approach, we
consider the photoproduction of D* mesons associated with two hadron jets and
the D* production in DIS at THERA conditions with the emphasis on the BFKL and
CCFM dynamics of gluon distributions. In the photoproduction of D* mesons the
attention is focused on the variable $x_\gamma$, which is the fraction of the
photon momentum contributed to a pair of jets with largest $p_T$. We show that
our theoretical results are sensitive to the BFKL type dynamics which may be
investigated at THERA energies. We also discuss possible effect of $\J/\psi$
meson spin alignement, which is thought to be a vivid manifestation of gluon
off-shellness.


title:
Phenomenological quark model for baryon magnetic moments and beta decay
  ratios ($G_A/G_V$)

abstract:
  Baryon magnetic moments and beta decay ratios ($G_A/G_V$) are calculated in a
phenomenological quark model. Non-static effects of pion exchange and orbital
excitation are included. Good agreement with experiment is found for a combined
fit to all measured baryon magnetic moments and beta decay ratios. The model
predicts an antiquark content for the proton that is consistent with the
Gottfried sum rule.


title: Power scaling rules for charmonia production and HQEFT

abstract:
  We discuss the power scaling rules along the lines of a complete Heavy Quark
Effective Field Theory (HQEFT) for the description of heavy quarkonium
production through a color-octet mechanism. To this end, we firstly derive a
tree-level heavy quark effective Lagrangian keeping both particle-antiparticle
mixed sectors allowing for heavy quark-antiquark pair annihilation and
creation, but describing only low-energy modes around the heavy quark mass.
Then we show the consistency of using HQEFT fields in constructing four-fermion
local operators a la NRQCD, to be identified with standard color-octet matrix
elements. We analyze some numerical values extracted from charmonia production
by different authors and their hierarchy in the light of HQEFT.


title: Finite temperature field theory

abstract:
  These lectures review phases and phase transitions of the Standard Model,
with emphasis on those aspects which are amenable to a first principle study.
Model calculations and theoretical ideas of practical applicability are
discussed as well. Contents: 1.Overview; 2. Field Theory at Finite Temperature
and Density; 3.Critical Phenomena; 4.Electroweak Interactions at Finite
Temperature; 5. Thermodynamics of Four Fermions models; 6.The Phases of QCD;
7.QCD at Finite Temperature, $\mu_B = 0$; 8.QCD at Finite Temperature, $\mu_B
\ne 0$.


title: QCD Spectroscopy at Gsi: Exotica and Charmonia

abstract:
  In this talk I give a short summary of the basics of conventional and exotic
meson spectroscopy, and consider in particular those issues in the charmonium
and charmonium hybrid sectors which can be addressed by a future antiproton
facility at GSI.


title: Implementing Unitarity in Perturbation Theory

abstract:
  Unitarity cannot be perserved order by order in ordinary perturbation theory
because the constraint $UU^\dagger=\1$ is nonlinear. However, the corresponding
constraint for $K=\ln U$, being $K=-K^\dagger$, is linear so it can be
maintained in every order in a perturbative expansion of $K$. The perturbative
expansion of $K$ may be considered as a non-abelian generalization of the
linked-cluster expansion in probability theory and in statistical mechanics,
and possesses similar advantages resulting from separating the short-range
correlations from long-range effects. This point is illustrated in two QCD
examples, in which delicate cancellations encountered in summing Feynman
diagrams of are avoided when they are calculated via the perturbative expansion
of $K$. Applications to other problems are briefly discussed.


title: Watson's theorem and electromagnetism in K -> pi pi decay

abstract:
  We consider what constraints unitarity and CPT invariance yield on the strong
and electromagnetic phases entering K -> pi pi decay. In particular, we show
that the relative size of the electromagnetically-induced changes in the I=0
and I=2 phase shifts in the two--pion final state do not depend on the explicit
coupling to the pi^+ pi^- gamma channel. This demonstrates that Watson's
theorem can be extended to include the presence of electromagnetism. We point
out the consequences for the general structure of the K -> pi pi decay
amplitudes in the presence of isospin violation.


title:
Supersymmetry Contribution to Bottom Quark Production at Hadron
  Colliders

abstract:
  A new contribution from pair-production of light gluinos, of mass 12 to 16
GeV, with two-body decays into bottom quarks and light bottom squarks, helps to
obtain a bottom-quark production rate in better agreement with hadron collider
data. The masses of the gluino and bottom squark are further restricted by the
ratio of like-sign to opposite-sign leptons at hadron colliders. Constraints on
this scenario from other data are examined and predictions are made.


title: Electro-strong interaction and high Q^2 events at HERA

abstract:
  A previously proposed unified field theory of electro-strong interactions
requires two scales of length within hadrons, $\sim10^{-15}m$ and
$\sim10^{-18}m$ respectively, and the onset of new phenomena at the shorter
scale. Studies at the HERA electron-proton collider at the shorter scale have
revealed a possible excess of high-transverse momentum events, as expected,
with $Q^2 \geq 30,000$ $(Gev/c)^2$. The collider is currently being upgraded.
This will permit a clearer test to be carried out.


title: Seesaw mechanism in three flavors

abstract:
  We advance a method used to analyse the neutrino properties (masses and
mixing) in the seesaw mechanism. Assuming the hierarchical Dirac and light
neutrino masses we establish rather simple relations between the light and the
heavy neutrino parameters in the favored region of the solar and the
atmospheric neutrino experiments. A empirical condition satisfied by the RH
mixing angles is obtained.


title: Massive fermion production in nonsingular superstring cosmology

abstract:
  We study massive spin-1/2 fermion production in nonsingular superstring
cosmology, taking into account one-loop quantum corrections to a superstring
effective action with dilaton and modulus fields. While no creation occurs in
the massless limit, massive fermions can be produced by the existence of a
time-dependent frequency. Due to the increase of the Hubble expansion rate
during the modulus-driven phase, the occupation of number of fermions continues
to grow until the point of the graceful exit, after which fermion creation
ceases with the decrease of the Hubble rate.


title: Strange hadron resonances as a signature of freeze-out dynamics

abstract:
  We study the production and the observability of Lambda*(1520), K*0(892), and
Sigma*(1385), strange hadron resonances as function of the freeze-out
conditions within the statistical model of hadron production. We obtain an
estimate of how many decay products are rescattered in evolution towards
thermal freeze-out following chemical freeze-out, and find that the resonance
decay signal is strong enough to be detected. We show how a combined analysis
of at least two resonances can be used to understand the chemical freeze-out
temperature, and the time between chemical and thermal freeze-outs.


title: On the Size of Hadrons

abstract:
  The form factor and the mean-square radius of the pion are calculated
analytically from a parametrized form of a $q\bar q$ wave function. The
numerical wave function was obtained previously by solving numerically an
eigenvalue equation for the pion in a particular model. The analytical formulas
are of more general interest than just be valid for the pion and can be
generalized to the case with unequal quark masses. Two different
parametrizations are investigated. Because of the highly relativistic problem,
noticable deviations from a non-relativistic formula are obtained.


title: Quadratic Divergences in Kaluza-Klein Theories

abstract:
  We investigate the so-called ``Kaluza-Klein regularisation'' procedure in
supersymmetric extensions of the standard model with additional compact
dimensions and Scherk-Schwarz mechanism for supersymmetry breaking. This
procedure uses a specific mathematical manipulation to obtain a finite result
for the scalar potential. By performing the full calculation, we show that the
finiteness of this result is not only a consequence of the underlying
supersymmetry, but also the result of an implicit fine-tuning of the
coefficients of the terms that control the ultraviolet behaviour. The
finiteness of the Higgs mass at one-loop level seems therefore to be an
artefact of the regularisation scheme, and quadratic divergences are expected
to reappear in higher orders of perturbation theory.


title:
$\etap K$ puzzle of B meson decays and new physics effects in the TC2
  model

abstract:
  Using the low energy effective Hamiltonian with the generalized
factorization, we calculate the new physics contributions to $B \to \pi^+
\pi^-, K \pi$ and $K \etap$ in the Topcolor-assisted-Technicolor(TC2) model,
and compare the results with the available data. By using $F_0^{{\rm
B\pi}}(0)=0.20\pm 0.04$ preferred by the CLEO data of $B \to \pi^+ \pi^-$
decay, we find that the new physics enhancements to $B \to K \etap$ decays are
significant in size, $\sim 50%$ with respect to the standard model predictions,
insensitive to the variations of input parameters and hence provide a simple
and plausible new physics interpretation for the observed unexpectedly large
$B\to K \etap$ decay rates.


title:
Possibility of T-violating P-conserving magnetism and its contribution
  to the T-odd P-even neutron-nucleus forward elastic scattering amplitude

abstract:
  T-violating P-even magnetism is considered. The magnetism arises from the
T-violating P-conserving vertex of a spin 1/2 particle interaction with the
electromagnetic field. The vertex varnishes for a particle on the mass shell.
Considering the particle interaction with a point electric charge we have
obtained the T-violating P-even spin dependent potential which is inversely
proportional to the cubed distance from the charge. The matrix element of this
potential is zero for particle states on the mass shell, nevertheless, the
potential contributes to the T-odd P-even neutron forward elastic scattering
amplitude by a deformed nucleus with spin S>1/2. The contribution arises if we
take into account incident neutron plane wave distortion by the strong neutron
interaction with the nucleus.


title:
The $B -> X_s gamma gamma$ decay in the standard model and the general
  two-Higgs-doublet model

abstract:
  Based on the low-energy effective Hamiltonian, we calculate the new physics
corrections to the branching ratio and the differential distributions of the
rare decay $B \to X_s \gamma \gamma$ induced by the new gluonic and electroweak
charged-Higgs penguin diagrams in the general two-Higgs-doublet model with the
restriction $\lambda_{ij}^{U,D}=0$ for $i\neq j$. Within the considered
parameter space, we see the following: (a) the standard model predictions of
${\cal B}(B \to X_s \gamma \gamma)$ and $A_{FB}$ have a moderate $m_s$
dependence; (b) in model III, the prediction of the branching ratio ${\cal B}(B
\to X_s \gamma \gamma)$ ranges from one third to three times of the standard
model prediction, but is highly correlated with that of ${\cal}(B \to X_s
\gamma)$; (c) the new physics enhancement to the branching ratio ${\cal B}(B
\to X_s \gamma \gamma)$ in model II can be as large as $(30-50)%$; (d) the
contribution from 1PR diagrams is dominant and hence four normalized
differential distributions are insensitive to the variation of scale $\mu$ and
possible new physics corrections; (e) due to the smallness of its decay rate
and the long-distance background, the $B \to X_s \gamma \gamma$ decay is not a
better process in detecting new physics than the $B \to X_s \gamma$ decay.


title: Radiative four-fermion processes at LEP2

abstract:
  The production of four fermions plus a visible photon in electron-positron
collisions is analyzed, with particular emphasis on the LEP2 energy range. The
study is based on the calculation of exact matrix elements, including the
effect of fermion masses. In the light of the present measurements performed at
LEP, triple and quartic anomalous gauge couplings are taken into account. Due
to the presence of a visible photon in the final state, particular attention is
paid to the treatment of higher-order QED corrections. Explicit results for
integrated cross sections and differential distributions are shown and
commented. The features of the Monte Carlo program WRAP, used to perform the
calculation and available for experimental analysis, are described.


title: Hyperon ratios at RHIC and the coalescence predictions at mid-rapidity

abstract:
  Quark coalescence predictions for various multi-strange baryon to anti-baryon
ratios for central Au+Au collisions at RHIC energies are compared to
preliminary data of the STAR collaboration. The formation of Quark Matter and
the sudden recombination of its constituent quarks into hadrons is found to be
in agreement with these preliminary data. It seems that strange hadron and
antihadron production in Au+Au collisions at RHIC is similar to that in Pb+Pb
collisions at CERN SPS.


title: Decays of the pi+ pi- atom

abstract:
  We construct an effective non-relativistic quantum field theory that
describes bound states of pi+ pi- pairs and their hadronic decays. We then
derive a general expression for the lifetime of the ground state at
next-to-leading order in isospin breaking. Chiral perturbation theory allows
one to relate the decay rate to the two S-wave pi pi scattering lengths and to
several low-energy constants that occur in the chiral Lagrangian. Recent
predictions for the scattering lengths give tau = (2.9 \pm 0.1) * 10^{-15} sec.
This result may be confronted with pi+ pi- lifetime measurements, like the one
presently carried out at CERN.


title:
Limitations of the $\Phi$ measure of fluctuations in event-by-event
  analysis

abstract:
  We provide a critical overview of the $\Phi$ measure of fluctuations and
correlations. In particular we show that its discriminating power is rather
limited in situations encountered in experiment.


title:
Gauge Invariance, Color-Octet Vector Resonances and Double Technieta
  Production at the Tevatron

abstract:
  We show that the usual vector meson dominance method does not apply directly
to the mixing of a color-octet vector boson (color-octet technirho) with the
gluon because of gauge invariance. We propose a gauge invariant method where
one works in a physical basis with mass eigenstate fields. As a result, we show
that the physical technirho does not couple to two gluons, contrary to the
general belief. Consequences for the production of a pair of color-octet,
isosinglet technipions (technietas) at Fermilab is analysed by means of a
simulation of the signal and background, including kinematical cuts. We find
that the signal is too small to be observed.


title: New Limits on the Color-Octet Technirho Mass from its Decay to Dijets

abstract:
  Recently has been shown that the physical (mass eigenstate) color-octet
technirho does not couple to two gluons. In this letter we study how this
result affects the presently accepted limits for the color-octet technirho mass
obtained from the study of dijets production at the Tevatron. First we show
that data from Tevatron Run 1b can not exclude any mass range. Finally, we
obtain limits for the Tevatron Run II.


title:
Supersymmetric lepton flavour violation in a linear collider: the role
  of charginos

abstract:
  The occurrence of a significant amount of supersymmetric lepton flavour
violation at laboratory energies, through $\tilde\nu_\mu - \tilde\nu_\tau$
mixing, has become a realistic possibility in the wake of the super-Kamiokande
atmospheric neutrino result. This effect can be observed in an e+e- linear
collider with the distinct final state tau+mu+ jets+E_T. We show that the pair
production of charginos can make an important contribution to this process and
has to be taken into account in addition to that of sneutrinos or charged
sleptons. Some case studies are presented with CM energies of 500 and 800 GeV
and integrated luminosities of 50, 500 and 1000 fb-1.


title: Casimir scaling in a dual superconducting scenario of confinement

abstract:
  The string tensions of flux tubes associated with static charges in various
SU(3) representations are studied within the dual Ginzburg-Landau (DGL) theory.
The ratios of the string tensions between higher and fundamental
representations, $d_{D} \equiv \sigma_{D}/\sigma_{F}$, are found to depend only
on the Ginzburg-Landau (GL) parameter, $\kappa = m_{\chi}/m_{B}$, the mass
ratio between monopoles $m_\chi$ and dual gauge bosons $m_B$. In the case of
the Bogomol'nyi limit ($\kappa=1$), analytical values of $d_{D}$ are easily
obtained by adopting the manifestly Weyl invariant formulation of the DGL
theory, which are provided simply by the number of color-electric Dirac strings
inside the flux tube. A numerical investigation of the ratio for various
GL-parameter cases is also performed, which suggests that the Casimir scaling
is obtained in the type-II parameter range within the interval $\kappa=5 \sim
9$ for various ratios $d_D$.


title:
The Monte Carlo Event Generator YFSWW3 version 1.16 for W-Pair
  Production and Decay at LEP2/LC Energies

abstract:
  We present the Monte Carlo event generator YFSWW3 version 1.16 for theprocess
of W-pair production and decay in electron-positron collisions. It includes
${\cal O}(\alpha)$ electroweak radiative corrections in the WW production stage
together with the ${\cal O}(\alpha^3)$ initial-state-radiation (ISR)
corrections in the leading-logarithmic (LL) approximation, implemented within
the Yennie-Frautschi-Suura (YFS) exclusive exponentiation framework. The photon
radiation in the W decays is generated by the dedicated program PHOTOS up to
${\cal O}(\alpha^2)$ LL, normalised to the W branching ratios. The program is
interfaced with the $\tau$ decay library TAUOLA and the quark
fragmentation/hadronization package JETSET. The semi-analytical code KORWAN for
the calculations of the differential and total cross-sections at the Born level
and in the ISR approximation is included.


title:
Renormalon-inspired resummations for vector and scalar correlators-
  estimating the uncertainty in {alpha}_{s}({m}_{\tau}^{2}) and and
  {\alpha}({M}_{Z}^{2})

abstract:
  We perform an all-orders resummation of the QCD Adler D-function for the
vector correlator, in which the portion of perturbative coefficients involving
the leading power of b, the first beta-function coefficient, is resummed. To
avoid a renormalization scale dependence when we match the resummation to the
exactly known NLO and NNLO results, we employ the Complete Renormalization
Group Improvement (CORGI) approach. These fixed-order and resummed CORGI
results are analytically continued by numerically performing a contour integral
to obtain corresponding fixed and all-orders ``contour-improved'' results for
the e+e- R-ratio ands its tau decay analogue R_{\tau}. The difference between
these fixed-order and all-order results is used to estimate the uncertainty in
the extraction of {alpha}_{s}({M}_{Z}^{2}} from R_{\tau} measurements, and that
in the QED coupling {\alpha}({M}_{Z}^{2}) due to hadronic corrections related
to R. Analogous resummations for the scalar correlator are performed, and used
to assess the uncertainty in the Higgs decay width to a heavy quark pair. We
point out that CORGI fixed-order contour-improved results for R and the Higgs
decay width, can be given explicitly in terms of the Lambert-W function and
hypergeometric functions, avoiding the need for numerical integration.


title:
Analysis of Couplings with Large Tensor Representations in SO(2N) and
  Proton Decay

abstract:
  We develop techniques for the analysis of SO(2N) invariant couplings which
allow a full exhibition of the SU(N) invariant content of the spinor and tensor
representations. The technique utilizes a basis consisting of a specific set of
reducible SU(N) tensors in terms of which the SO(2N) invariant couplings have a
simple expansion. The technique is specially useful for couplings involving
large tensor representations. We exhibit the technique by performing a complete
determination of the trilinear couplings in the superpotential for the case of
SO(10) involving the 16 plet of matter, i.e., we give a full determination of
the ${16-16-10_s}$, ${16-16-120_a}$ and ${16-16-\bar{126}_s}$ couplings. The
possible role of large tensor representations in the generation of quark lepton
textures is discussed. It is shown that the couplings involving $\bar{126}$
dimensional representation generate extra zeros in the Higgs triplet textures
which can lead to an enhancement of the proton decay lifetime by a factor of
$10^3$. These results also have implications for neutrino mass textures.


title: Kaon and Charm Physics: Theory

abstract:
  We introduce and discuss basic topics in the theory of kaons and charmed
particles. In the first part, theoretical methods in weak decays such as
operator product expansion, renormalization group and the construction of
effective Hamiltonians are presented, along with an elementary account of
chiral perturbation theory. The second part describes the phenomenology of the
neutral kaon system, CP violation, $\varepsilon$ and
$\varepsilon'/\varepsilon$, rare kaon decays ($K\to\pi\nu\bar\nu$, $K_L\to\pi^0
e^+e^-$, $K_L\to\mu^+\mu^-$), and some examples of flavour physics in the charm
sector.


title:
Probing Models with Near Degeneracy of the Chargino and LSP at a Linear
  e+e- Collider

abstract:
  For some choices of soft SUSY--breaking parameters, the LSP is a stable
neutralino, the NLSP is a chargino almost degenerate in mass with the LSP (with
mass difference $\sim m_{\pi}-$few GeV), and all other sparticles are
relatively heavy. We discuss the potential of a $\sqrt{s}\sim 600\gev$ $e^+e^-$
collider for studying such models.


title: The Glueball sector of two-flavor Color Superconductivity

abstract:
  We construct the effective Lagrangian describing the light glueballs
associated with the unbroken and confining SU(2) color subgroup for the 2
flavor superconductive phase of QCD. This Lagrangian constitutes a key
ingredient for understanding the non perturbative physics of 2 flavor color
superconductivity. We estimate the two photon decay process of the light
glueballs using the saturation of the electromagnetic trace anomaly at the
effective Lagrangian level. The present results are particularly relevant to
our model of Gamma Ray Bursts based on color superconductivity in Quark Stars
(R. Ouyed and F. Sannino astro-ph/0103022).


title: Baryons with two heavy quarks

abstract:
  We consider general physical characteristics of doubly heavy baryons: the
spectroscopy in the framework of potential approach and sum rules of QCD,
mechanisms of production in various interactions on the basis of fragmentation
model with account of preasymptotic corrections caused by higher twists over
the transverse momentum of baryon, inclusive decays and lifetimes in the
operator product expansion over the inverse powers of heavy quark masses as
well as the exclusive decays in the sum rules of QCD. We generalize the methods
developed in the effective theory of heavy quarks towards the description of
systems with two heavy quarks and a single light quark. The calculations are
presented for the masses, decay widths and yields of baryons with two heavy
quarks in the running and planned experimental facilities. We discuss the
prospects of search for the baryons and possibilities of experimental
observation. The most bright physical effects concerning these baryons as well
as their position in the system for the theoretical description of heavy quark
dynamics are considered.


title: A combined treatment of neutrino decay and neutrino oscillations

abstract:
  Neutrino decay in vacuum has often been considered as an alternative to
neutrino oscillations. Because non-zero neutrino masses imply the possibility
of both neutrino decay and neutrino oscillations, we present a
model-independent formal treatment of these combined scenarios. For that, we
show for the example of Majoron decay that in many cases decay products are
observable and may even oscillate. Furthermore, we construct a minimal scenario
where we study the physical implications of neutrino oscillations with
intermediate decays.


title: N^* electroproduction amplitudes in a model with dynamical confinement

abstract:
  The Roper resonance is described in a chiral version of the chromodielectric
model as a cluster of three quarks in radial-orbital configuration
(1s)$^2$(2s)$^1$, surrounded by $\pi$ and $\sigma$-meson clouds and by a
chromodielectric field which assures quark dynamical confinement. Radial
profiles for all fields are determined self-consistently for each baryon.
Transverse $A_{1/2}$ and scalar $S_{1/2}$ helicity amplitudes for the
nucleon-Roper transition are calculated. The contribution of glueball and
$\sigma$-meson vibrations is estimated; although small for N(1440), the
$\sigma$ contribution can be large for N(1710).


title: Generalized dipole polarizabilities and the spatial structure of hadrons

abstract:
  We present a phenomenological discussion of spin-independent, generalized
dipole polarizabilities of hadrons entering the virtual Compton scattering
process gamma* h -> gamma h. We introduce a new method of obtaining a tensor
basis with appropriate Lorentz-invariant amplitudes which are free from
kinematical singularities and constraints. We then motivate a gauge-invariant
separation into a generalized Born term containing ground-state properties
only, and a residual contribution describing the model-dependent internal
structure. The generalized dipole polarizabilities are defined in terms of
Lorentz-invariant residual amplitudes. Particular emphasis is laid on a
physical interpretation of these quantities as characterizing the spatial
distributions of the induced electric polarization and magnetization of
hadrons. It is argued that three dipole polarizabilities, namely the
longitudinal electric alpha_L(q^2), the transverse electric alpha_T(q^2), and
the magnetic beta(q^2) ones are required in order to fully reconstruct local
polarizations induced by soft external fields in a hadron. One of these
polarizabilities, alpha_T(q^2), describes an effect of higher order in the soft
final-photon momentum q'. We argue that the associated spatial distributions
obtained via the Fourier transforms in the Breit frame are meaningful even for
such a light particle as the pion. The spatial distributions are determined at
large distances r ~ 1/m_pi for pions, kaons, and octet baryons by use of ChPT.


title:
Scalar Glueball-qqbar Mixing above 1 GeV and implications for Lattice
  QCD

abstract:
  Lattice QCD predictions have motivated several recent studies of the mixing
between the predicted JPC = 0++ glueball and a qqbar nonet in the 1.3 to 1.7
GeV region. We show that results from apparently different approaches have some
common features, explain why this is so and abstract general conclusions. We
place particular emphasis on the flavour dependent constraints imposed by
decays of the f0(1370), f0(1500) and f0(1700) to all pairs of pseudoscalar
mesons. From these results we identify a systematic correlation between
glueball mass, mixing, and flavour symmetry breaking and conclude that the
glueball may be rather lighter than some quenched lattice QCD computations have
suggested. We identify experimental tests that can determine the dynamics of a
glueball in this mass region and discuss quantitatively the feasibility of
decoding glueball-qqbar mixing.


title:
Incorporating next-to-leading order matrix elements for hadronic diboson
  production in showering event generators

abstract:
  A method for incorporating information from next-to-leading order QCD matrix
elements for hadronic diboson production into showering event generators is
presented. In the hard central region (high jet transverse momentum) where
perturbative QCD is reliable, events are sampled according to the first order
tree level matrix element. In the soft and collinear regions next-to-leading
order corrections are approximated by calculating the differential cross
section across the phase space accessible to the parton shower using the first
order (virtual graphs included) matrix element. The parton shower then provides
an all-orders exclusive description of parton emissions. Events generated in
this way provide a physical result across the entire jet transverse momentum
spectrum, have next-to-leading order normalization everywhere, and have
positive definite event weights. The method is generalizable without
modification to any color singlet production process.


title: Axion-like particles as ultra high energy cosmic rays?

abstract:
  If Ultra High Energy Cosmic Rays (UHECRs) with E>4 10^{19} eV originate from
BL Lacertae at cosmological distances as suggested by recent studies, the
absence of the GZK cutoff can not be reconciled with Standard-Model particle
properties. Axions would escape the GZK cutoff, but even the coherent
conversion and back-conversion between photons and axions in large-scale
magnetic fields is not enough to produce the required flux. However, one may
construct models of other novel (pseudo)scalar neutral particles with
properties that would allow for sufficient rates of particle production in the
source and shower production in the atmosphere to explain the observations. As
an explicit example for such particles we consider SUSY models with light
sgoldstinos.


title: Neutrino kinetics in a magnetized dense plasma

abstract:
  The relativistic kinetic equations (RKE) for lepton plasma in the presence of
a strong external magnetic field are derived in Vlasov approximation. The new
RKE for the electron spin distribution function includes the weak interaction
with neutrinos originated by the axial vector current ($\sim c_A$) and provided
by the parity nonconservation. In a polarized electron gas Bloch equation
describing the evolution of the magnetization density perturbation is derived
from the electron spin RKE being modified in the presence of neutrino fluxes.
Such modified hydrodynamical equation allows to obtain the new dispersion
equation in a magnetized plasma from which the neutrino driven instability of
spin waves can be found. It is shown that this instability is more efficient
e.g. in a magnetized supernova than the analogous one for Langmuir waves
enhanced in an isotropic plasma.


title:
Evolution program for parton densities with perturbative heavy flavor
  boundary conditions

abstract:
  A new code for the scale evolution of modified-minimal-subtraction-scheme
parton densities is described. Through next-to-leading order the program uses
exact splitting functions. In next-to-next-to-leading order approximate
splitting functions are used. For efficiency the program includes analytical
results for the evaluation of the weights required for the integrations over
the longitudinal momentum fractions of the partons. It also incorporates the
operator matrix elements required for the matching conditions across heavy
flavor thresholds in higher order perturbation theory. The more efficient
handling of the weights implies that the code is faster than similar evolution
codes in all modes of operation. The program is written in the C programming
language.


title:
Soft Supersymmetry Breaking, Scalar Top-Charm Mixing and Higgs
  Signatures

abstract:
  The squark mass-matrix from the soft supersymmetry (SUSY) breaking sector
contains a rich flavor-mixing structure that allows O(1) mixings among top- and
charm-squarks while being consistent with all the existing theoretical and
experimental bounds. We formulate a {\it minimal} flavor-changing-neutral
current scheme in which the squark mixings arise from the non-diagonal scalar
trilinear interactions. This feature can be realized in a class of new models
with horizontal U(1)_H symmetry which generates realistic quark-mass matrices
and provides a solution to the SUSY \mu-problem. Finally, without using the
mass-insertion approximation, we analyze SUSY radiative corrections to the
bcH^+ and tch^0 couplings, and show that these couplings can reveal exciting
new discovery channels for the Higgs boson signals at the Tevatron and the LHC.


title: Solar neutrinos: global analysis and implications for SNO

abstract:
  We present a global analysis of all the available solar neutrino data
treating consistently the 8B and hep neutrino fluxes as free parameters. The
analysis reveals at 99.7% C.L. eight currently-allowed discrete regions in
two-neutrino oscillation space, five regions corresponding to active neutrinos
and three corresponding to sterile neutrinos. Most of the allowed solutions are
robust with respect to changes in the analysis procedure, but the traditional
vacuum solution is fragile. The globally-permitted range of the 8B neutrino
flux, 0.45 to 1.95 in units of the BP2000 flux, is comparable to the 3 sigma
range allowed by the standard solar model. We discuss the implications for SNO
of a low mass, Delta m^2 ~ 6 times 10^{-12} eV^2, vacuum oscillation solution,
previously found by Raghavan, and by Krastev and Petcov, but absent in recent
analyses that included Super-Kamiokande data. For the SNO experiment, we
present refined predictions for the charged-current rate and the ratio of the
neutral-current rate to charged-current rate. The predicted charged-current
rate can be clearly distinguished from the no-oscillation rate only for the LMA
solution. The predicted ratio of the neutral-current rate to charged-current
rate is distinguishable from the no-oscillation ratio for the LMA, SMA, LOW,
and VAC solutions for active neutrinos.

categories: hep-ph astro-ph cond-mat hep-ex nucl-ex nucl-th


title: Low-scale Quantum Gravity and Double Nucleon Decay

abstract:
  In models with a low quantum gravity scale, one might expect sizable effects
from nonrenormalizable interactions that violate the global symmetries of the
standard model. While some mechanism must be invoked in such theories to
suppress higher-dimension operators that contribute to proton decay, operators
that change baryon number by two units are less dangerous and may be present at
phenomenologically interesting levels. Here we focus on Delta B=2 operators
that also change strangeness. We demonstrate how to compute explicitly a
typical nucleon-nucleon decay amplitude, assuming a nonvanishing six-quark
cluster probability and MIT bag model wave functions. We then use our results
to estimate the rate for other possible modes. We find that such
baryon-number-violating decays may be experimentally accessible if the
operators in question are present and the Planck scale is less than ~ 400 TeV.


title:
Pion Production by Parametric Resonance Mechanism with Quantum Back
  Reactions

abstract:
  We investigate the problem of quantum back reactions due to particle
production by the parametric resonance mechanism in an environment of
nonequilibrium chiral phase transition. We work with the linear sigma model and
employ Boyanovsky et al.'s formalism to take account of back reactions under
the Hartree-Fock approximation. We calculate the single pion momentum
distributions and two pion correlations under the initial condition of thermal
equilibrium and small amplitude sigma oscillations around a potential minimum.
We observe that the resonance peak survives under the back reaction which is
remarkable considering the strong coupling of the sigma model.


title:
No-Scale Scenarios in the Light of New Measurement of Muon Anomalous
  Magnetic Moment

abstract:
  Supersymmetric contribution to the muon anomalous magnetic moment a_\mu is
discussed in the no-scale-type supersymmetry breaking scenarios. Taking the
correlation between the supersymmetric contributions to a_\mu and Br(b\to
s\gamma), it is shown that the precise measurements of these quantities serve
an important constraint on the relative sign of the gaugino masses; combining
the 2.6-\sigma deviation in a_\mu from the standard-model prediction measured
by the E821 experiment and Br(b\to s\gamma) measured by CLEO, the sign of the
product M_2M_3 is strongly preferred to be positive, where M_2 and M_3 are
SU(2)_L and SU(3)_C gaugino mass parameters, respectively. In particular,
no-scale-type models with universal gaugino masses are in accord with the two
constraints and also with the Higgs mass bound. In addition, it is also shown
that future improvements in the measurements of a_\mu and Br(b\to s\gamma) may
provide serious test of the cases with M_2M_3<0.


title:
Muon Anomalous Magnetic Moment, Two-Higgs-Doublet Model, and
  Supersymmetry

abstract:
  The recent measurement on the muon anomalous magnetic moment $a_\mu$ shows a
$2.6\sigma$ deviation from the standard model value. We show that it puts
strong constraints on the parameter space of the two-higgs doublet model (2HDM)
II. The dominant contribution of the Higgses comes at the two-loop level, and
in order to explain the data it favors a pseudoscalar $A$ with a light mass
range and a large $\tan\beta$. At 95% C.L., upper limit for
$m_{\scriptscriptstyle A}$ is $29 (55) (85)$ GeV for $\tan\beta=30 (45)
  (60)$, and $\tan \beta$ is bounded below at 17. This is in sharp contrast to
the conclusion one draws from considering one-loop Higgs contributions alone.
Finally, we also discuss the role of the Higgs contributions in the minimal
supersymmetric standard model.


title: Coulomb dissociation of a fast pion into two jets

abstract:
  We calculate the electromagnetic contribution to the scattering amplitude of
pion diffractive dissociation into di-jets which is described by one photon
exchange. The result shows that the factorization procedure known for the
description of exclusive reactions holds also for this quasi-exclusive process.
We find that the longitudinal momentum distribution of di-jets does not depend
on the form of the pion distribution amplitude. We discuss the magnitude of the
cross section.


title: Pair Production from Vacuum at the Focus of an X-Ray Free Electron Laser

abstract:
  There are definite plans for the construction of X-ray free electron lasers
(FEL), both at DESY, where the so-called XFEL is part of the design of the
electron-positron linear collider TESLA, as well as at SLAC, where the
so-called Linac Coherent Light Source (LCLS) has been proposed. Such an X-ray
laser would allow for high-field science applications: One could make use of
not only the high energy and transverse coherence of the X-ray beam, but also
of the possibility of focusing it to a spot with a small radius, hopefully in
the range of the laser wavelength. Along this route one obtains very large
electric fields, much larger than those obtainable with any optical laser of
the same power. In this letter we discuss the possibility of obtaining an
electric field so high that electron-positron pairs are spontaneously produced
in vacuum (Schwinger pair production). We find that if X-ray optics can be
improved to approach the diffraction limit of focusing, and if the power of the
planned X-ray FELs can be increased to the terawatt region, then there is ample
room for an investigation of the Schwinger pair production mechanism.

categories: hep-ph astro-ph hep-ex hep-th physics.plasm-ph


title: Quark-Antiquark Potential and Generalized Borel Transform

abstract:
  The heavy quark potential and particularly the one proposed by Richardson to
incorporate both asymptotic freedom and linear confinement is analyzed in terms
of a generalized Borel Transform recently proposed. We were able to obtain, in
the range of physical interest, an approximate analytical expression for the
potential in coordinate space valid even for intermediate distances. The
deviation between our approximate potential and the numerical evaluation of the
Richardson's one is much smaller than $\Lambda $ of QCD. The $c\overline{c}$
and $b\overline{b}$ quarkonia energy levels agree reasonably well with
experimental data for $c$ and $b$ masses in good agreement with the values
obtained from experiments.


title: Radion Phenomenology in the Randall Sundrum Scenario

abstract:
  Phenomenology of a radion ($\phi$) in the Randall-Sundrum scenario is
discussed. The radion couples to the trace of energy momentum tensor of the
standard model with a strength suppressed only by a new scale
($\Lambda_{\phi}$) which is an order of the electroweak scale. In particular,
the effective coupling of a radion to two gluons is enhanced due to the trace
anomaly of QCD. Therefore, its production cross section at hadron colliders
could be enhanced, and the dominant decay mode of a relatively light radion is
$\phi \to g g$, unlike the SM Higgs boson case. We also present constraints on
the mass $m_{\phi}$ and the new scale $\Lambda_{\phi}$ from the Higgs search
limit at LEP, perturbative unitarity bound and the stability of the
radion/Higgs potential under radiative corrections.


title: Covariant approach to equilibration in effective field theories

abstract:
  The equilibration of two coupled reservoirs is studied using a Green function
approach which is suitable for future development with the closed time path
method. The problem is solved in two parameterizations, in order to demonstrate
the non-trivial issues of parameterization in both the intermediate steps and
the interpretation of physical quantities. We use a covariant approach to find
self-consistent solutions for the statistical distributions as functions of
time. We show that by formally introducing covariant connections, one can
rescale a slowly varying non-equilibrium theory so that it appears to be an
equilibrium one, for the purposes of calculation. We emphasize the importance
of properly tracking variable redefinitions in order to correctly interpret
physical quantities.


title:
Radiative electroweak symmetry breaking in the extra dimensions
  scenarios

abstract:
  We study the radiative spontaneous electroweak symmetry breaking in the extra
dimensions scenarios of the standard model extension proposed by Antoniadis
{\it et al}, Dienes {\it et al.} and Pomarol {\it et al.}. In the framework of
multi-scale effective theory when viewing from the ultraviolet cutoff scale
down to the low energy scale, we find that the effects of Kaluza-Klein
excitations of bosons can change the sign of the Higgs mass term of the
standard model from positive to negative and therefore trigger the electroweak
symmetry breaking at 1.6 (2) TeV or so when the compactification scale is
assumed to be 0.8 (1.5) TeV or so. New particle contents beyond the SM or
supersymmetry are not necessary for this mechanism. We conclude that in the
extra dimension scenarios, the radiative correction can naturally induce the
desired electroweak symmetry breaking.


title: Production of Light Goldstone Particles on Photon Colliders

abstract:
  By realizing the project of intensive
  $\gamma $ beams with large energy (necessary for Photon Colliders) an
essential flux of light Goldstone particles (LGP - axions, arions, familons,
majorons) can be generated. The probability of LGP production is calculated for
different densities of laser photons in the conversion region (with absorption
of one or several laser photons). The method for observation of LGP via its
absorption in the matter is also presented.


title: Derivative expansions of the non-equilibrium effective action

abstract:
  New techniques for evaluating the closed time path action for non-equilibrium
quantum fields are presented. A derivative expansion is performed using a
proper time kernel. Applications relevant to the scalar field theory of warm
inflation are discussed and dissipation terms resummed. The effective action of
the electromagnetic field is also considered. In this case the leading term can
be related to the conductivity of a plasma and has a simple interpretation in
terms of the classical Drude theory of conductivity.


title:
Active-sterile neutrino oscillations in the early Universe: asymmetry
  generation at low |delta m^2| and the Landau-Zener approximation

abstract:
  It is well established that active-sterile neutrino oscillations generate
large neutrino asymmetries for very small mixing angles ($\sin^2
2\theta_0\lesssim 10^{-4}$), negative values of $\delta m^2$ and provided that
$|\delta m^2|\gtrsim 10^{-4} {\rm eV^2}$. By numerically solving the quantum
kinetic equations, we show that the generation still occurs at much lower
values of $|\delta m^2|$. We also describe the borders of the generation at
small mixing angles and show how our numerical results can be analytically
understood within the framework of the Landau-Zener approximation thereby
extending previous work based on the adiabatic limit. This approximate approach
leads to a fair description of the MSW dominated regime of the neutrino
asymmetry evolution and is also able to correctly reproduce its final value. We
also briefly discuss the impact that neutrino asymmetry generation could have
on big bang nucleosynthesis, CMBR and relic neutrinos.


title:
False vacuum decay: effective one-loop action for pair creation of
  domain walls

abstract:
  An effective one-loop action built from the soliton field itself for the
two-dimensional (2D) problem of soliton pair creation is proposed. The action
consists of the usual mass term and a kinetic term in which the simple
derivative of the soliton field is replaced by a covariant derivative. In this
effective action the soliton charge is treated no longer as a topological
charge but as a Noether charge. Using this effective one-loop action, the
soliton-antisoliton pair production rate is calculated and one recovers Stone's
exponential factor and the prefactor of Kiselev, Selivanov and Voloshin. The
results are also valid straightforwardly to the problem of pair creation rate
of domain walls in dimensions greater than 2.


title: Study of the $B_c$-meson lifetime

abstract:
  We in terms of optical theorem estimate the lifetime of $B_c-$meson with the
parameters which are deturmined by fitting the data for the lifetimes and
inclusive semilepton-decays of various $B$ and $D$ mesons. In the estimate, we
find that the bound-state effects are important, and take them into account
carefully in the framework which attributes the effects to the effective masses
of the decay heavy quarks in the inclusive processes. We also find that to
$B_c$ lifetime the penguin contribution is enhanced due to possible
interference between the penguin and the `tree part' $c_1O_1+c_2O_2$.


title:
Comment on Neutrino Masses and Oscillations in an $SU(3)_L \times
  U(1)_N$ Model with Radiative Mechanism

abstract:
  We discussed how neutrino masses and oscillations are radiatively generated
in an $SU(3)_L$ $\times$ $U(1)_N$ gauge model with a symmetry based on
$L_e-L_\mu-L_\tau$ ($\equiv$$L^\prime$). The model is characterized by lepton
triplets $\psi^i=(\nu^i,\ell^{-i},E^{-i})$, where $E^{-i}$ are negatively
charged heavy leptons, an $SU(3)_L$ triplet Higgs scalar $\xi$ and a singlet
Higgs scalar $k^{++}$. These Higgs scalars can be interpreted as a Zee's and
Zee-Babu's scalar for radiative mechanisms. We demonstrated that the mass
hierarchy of $\Delta m_{atm}^2$ $\gg$ $\Delta m_\odot^2$ arise as a consequence
of the dynamical hierarchy between $L^\prime$-conserving one-loop effects and
$L^\prime$-violating two-loop effects, and our model is relevant to yield
quasivacuum solution for solar neutrino problem.


title: Searching for New Physics via CP Violation in B -> pi pi

abstract:
  We show how B -> pi pi decays can be used to search for new physics in the b
-> d flavour-changing neutral current. One needs one piece of theoretical
input, which we take to be a prediction for P/T, the ratio of the penguin and
tree amplitudes in Bd -> pi+ pi-. If present, new physics can be detected over
most of the parameter space. If \alpha (\phi_2) can be obtained independently,
measurements of B+ -> pi+ pi0 and Bd/Bd(bar) -> pi0 pi0 are not even needed.


title: CP Asymmetry Measurements in psi K0 and the CKM Paradigm

abstract:
  Recent experimental observations of CP asymmetry in B0 -> psi K0 constitute
the first significant signal of CP violation outside the neutral kaon system;
thus they represent an important milestone to test the CKM paradigm. We,
therefore, undertake a critical appraisal of the existing experimental and
theoretical inputs used to deduce constraints on sin(2 beta) and other
important parameters and thus find, in particular, sin(2 beta) > 0.50 at 95% CL
which is completely compatible with the combined experimental result: sin(2
beta) = 0.46 +- 0.17, representing an important success of the CKM model of CP
violation. Searches for new physics in B decays to psi+K0 like final states
will require improved precision; we make some suggestions to facilitate these.
We also present a global fit including the new CP asymmetry measurements in
B->psi+K0 as an additional input yielding e.g. gamma =29-56 degrees, eta-bar =
>.19-.36, rho-bar=.15-.37, Jcp=(1.8 - 3.0) X 10^(-5), $Br(K+ -> pi+ nu
nu-bar)=(0.51 - 0.90) X 10^(-10) and Br(KL -> pi0 nu nu-bar) = (0.11 - 0.31) X
10^(-10) at 95% CL.


title: Pion production in nonequilibrium Chiral perturbation Theory

abstract:
  We apply the formalism of Chiral Perturbation Theory out of thermal
equilibrium to describe explosive production of pions via the parametric
resonance mechanism. To lowest order the lagrangian is that of the Nonlinear
Sigma Model where the pion decay constant becomes a time-dependent function.
This model alows for a consistent nonequilibrium formulation within the
framework of the closed time path method, where one-loop effects can be
systematically accounted for and renormalized. We work in the narrow resonance
regime where there is only one resonant band. The present approach is limited
to remain below the back-reaction time, although it accounts for nearly all the
pion production during the typical plasma lifetime. The space and time
components of the pion decay constant are also analyzed.


title: Muon and tau anomalies updated

abstract:
  We present a new independent evaluation of the hadronic vacuum polarization
contributions a_l{had}(l.o)=(1/2)(g-2)_l{had}(l.o) to the anomalous magnetic
moment (anomaly) of the muon and tau leptons using tau-decays and e+e- data.
The alone theoretical input used for describing the high-energy region not
accessible experimentally is perturbative QCD plus (negligible) additional
effects due to the QCD vacuum condensates. We obtain: a_mu{had}(l.o)=
7020.6(75.6)10^{-11} and a_tau{had}(l.o)= 353.6(3.8)10^{-8}, which we compare
with previous determinations. Our analysis leads to the Standard Model (SM)
prediction: a_mu^{SM}=116~591~846.9(78.9)10^{-11}.Confronting a_mu^{SM} with
the recent BNL measurement leads to a_mu{new}=
a_mu{exp}-a_mu{SM}=176(170)10^{-11}. Combined with the mean existing
determinations of a_mu^{had}(l.o), this leads to the conservative range: -42 <
a_mu{new}10^{11} < 413 at 90% CL, from which we derive conservative lower
bounds on the scales of some new physics. We also update our old predictions of
the SM contributions to a_tau. Including QED to sixth order, higher order
hadronic and electroweak contributions, we obtain a_tau{SM}=117 755(7)10^{-8},
waiting for a future precise measurement of a_tau.


title: Nonstandard neutrino properties and the high-energy cosmic neutrino flux

abstract:
  Recently, it has been shown that cosmic neutrino flux at the GRB/AGN source,
$F_{\nu_e}^0 : F_{\nu_{\mu}}^0 : F_{\nu_{\tau}}^0 \simeq 1 :2 :0 $, inevitably
oscillates (in the three neutrino framework) to 1 : 1: 1, irrespective of the
mixing angle relevant to the solar data. It has also been pointed out that the
intrinsic flux of the cosmic high-energy neutrinos may not have the standard
ratio, in which case the cosmic neutrino flux in the far distance should be
dependent of the mixing angle. For neutrinos with nonzero electromagnetic
properties, we show in the latter case that matter effects on oscillations of
high-energy cosmic neutrinos can substantially modify the vacuum oscillation
probability, if the mass-squared difference is $\lsim 10^{-10}$ eV^2.


title: New Supernova Limit on Large Extra Dimensions

abstract:
  If large extra dimensions exist in nature, supernova (SN) cores will emit
large fluxes of Kaluza-Klein gravitons, producing a cosmic background of these
particles with energies and masses up to about 100 MeV. Radiative decays then
give rise to a diffuse cosmic gamma-ray background with E_gamma < 100 MeV which
is well in excess of the observations if more than 0.5-1% of the SN energy is
emitted into the new channel. This argument complements and tightens the
well-known cooling limit from the observed duration of the SN1987A neutrino
burst. For two extra dimensions we derive a conservative bound on their radius
of R < 0.9 x 10^-4 mm, for three extra dimensions it is R < 1.9 x 10^-7 mm.


title: Zee model and phenomenology of lepton sector

abstract:
  The virtual effects of the Zee charged scalar boson on the
lepton-family-number (LFN) violating processes are studied. We obtain the
constraints on the individual Yukawa coupling constants of the Zee boson to
leptons. Using these constraints, we predict the upper bounds on the
muonium-antimuonium conversion probability, the branching fractions of the LFN
violating decays such as $\tau \to e\gamma$, $\tau \to \mu\gamma$, $\tau^- \to
\mu^+e^-e^-$ and $\tau \to e^+\mu^-\mu^-$. The contribution of the Zee boson to
the muon anomalous magnetic moment is also considered


title:
Nuclear Broadening Effects on Hard Prompt Photons at Relativistic
  Energies

abstract:
  We calculate prompt photon production in high-energy nuclear collisions. We
focus on the broadening of the intrinsic transverse momenta of the partons in
the initial state from nuclear effects, and their influence on the prompt
photon p_t distribution. Comparing to WA98 data from Pb+Pb collisions at SPS
energy we find evidence for the presence of nuclear broadening at high p_t in
this hard process. Below p_t=2.7 GeV the photon distribution is due to small
momentum transfer processes. At RHIC energy, the effect of intrinsic transverse
momentum on the spectrum of prompt photons is less prominent. The region
p_t=3-4 GeV would be the most promising for studying the nuclear broadening
effects at that energy. Below p_t=2-3 GeV the contribution from large momentum
transfers flattens out, and we expect that region to be dominated by soft
contributions.


title: Instantons and Glueballs

abstract:
  We investigate the impact of instantons on scalar glueball properties in a
largely model-independent analytical approach based on the instanton-improved
operator product expansion (IOPE) of the $0^{++}$ glueball correlator. The
instanton contributions turn out to be dominant, to substantially improve the
consistency of the correponding QCD sum rules, and to increase the glueball
residue about fivefold.


title: Lepton Transmutation in $e^+e^-$ Collision

abstract: This paper is subsumed and superseded by hep-ph/0111175.


title: Spontaneous CPT Violation in Confined QED

abstract:
  Symmetry breaking induced by untwisted fermions in QED in a nonsimply
connected spacetime with topology $S^{1}\times R^{3}$ is investigated. It is
found that the discrete CPT symmetry of the theory is spontaneously broken by
the appearance of a constant vacuum expectation value of the electromagnetic
potential along the direction of space periodicity. The constant potential is
shown to be gauge nonequivalent to zero in the nonsimply connected spacetime
under consideration. Due to the symmetry breaking, one of the electromagnetic
modes of propagation is massive with a mass that depends on the inverse of the
compactification length. As a result, the system exhibits a sort of topological
directional superconductivity.


title:
Ultrahigh-Energy Neutrino-Nucleon Cross Sections and Perturbative
  Unitarity

abstract:
  Unitarity relates the total cross section for neutrino-nucleon scattering to
the neutrino-nucleon forward scattering amplitude. Assuming the validity of the
perturbative expansion of the forward amplitude in the {\em weak} coupling
constant, we derive a unitarity bound on the inelastic cross section. The
inelastic cross section saturates this bound at a typical neutrino energy
$E_\nu \simeq 10^8 {\rm GeV}$. This implies that calculations of the inelastic
cross section that use current parton distribution functions and lowest order
weak perturbation theory are unreliable above this energy.


title: Determination of nuclear parton distributions

abstract:
  Parametrization of nuclear parton distributions is investigated in the
leading order of alpha_s. The parton distributions are provided at Q^2=1 GeV^2
with a number of parameters, which are determined by a chi^2 analysis of the
data on nuclear structure functions. Quadratic or cubic functional form is
assumed for the initial distributions. Although valence quark distributions in
the medium x region are relatively well determined, the small x distributions
depend slightly on the assumed functional form. It is difficult to determine
the antiquark distributions at medium x and gluon distributions. From the
analysis, we propose parton distributions at Q^2=1 GeV^2 for nuclei from
deuteron to heavy ones with the mass number A~208. They are provided either
analytical expressions or computer subroutines for practical usage. Our studies
should be important for understanding the physics mechanism of the nuclear
modification and also for applications to heavy-ion reactions. This kind of
nuclear parametrization should also affect existing parametrization studies in
the nucleon because "nuclear" data are partially used for obtaining the optimum
distributions in the "nucleon".


title: From Quark Stars to Hybrid Stars

abstract:
  We show the possible existence of compact stars having a surface composed of
a mixed phase of quarks and hadrons. This scenario can be realized both for
self-bound stars, satisfying the so-called Witten-Bodmer hypothesis, and for
gravitationally bound stars. This class of solutions of the
Tolman-Oppenheimer-Volkoff equation can be obtained in all the models we
discuss, within a physically acceptable range of values of the model
parameters.


title: The Running Coupling BFKL Anomalous Dimensions and Splitting Functions

abstract:
  I explicitly calculate the anomalous dimensions and splitting functions
governing the Q^2 evolution of the parton densities and structure functions
which result from the running coupling BFKL equation at LO, i.e. I perform a
resummation in powers of ln(1/x) and in powers of beta_0 simultaneously. This
is extended as far as possible to NLO. These are expressed in an exact,
perturbatively calculable analytic form, up to small power-suppressed
contributions which may also be modelled to very good accuracy by analytic
expressions. Infrared renormalons, while in principle present in a solution in
terms of powers in alpha_s(Q^2), are ultimately avoided. The few higher twist
contributions which are directly calculable are extremely small. The splitting
functions are very different from those obtained from the fixed coupling
equation, with weaker power-like growth ~x^(-0.25), which does not set in until
extremely small x indeed. The NLO BFKL corrections to the splitting functions
are moderate, both for the form of the asymptotic power-like behaviour and more
importantly for the range of x relevant for collider physics. Hence, a stable
perturbative expansion and predictive power at small x are obtained.


title: QCD factorization for B -> PP

abstract:
  In this work, we give a detailed discussion for QCD factorization involved
the complete chirally enhanced power corrections for B decays to two light
pseudoscalar mesons, and present some detailed calculations of radiative
corrections at the order of alpha_s. We point out that the infrared finiteness
of the vertex corrections in the chirally enhanced power corrections requires
twist-3 light-cone distribution amplitudes (LCDAs) of the light pseudoscalar
symmetric. However, even in the symmetric condition, there is also logarithmic
divergence from the endpoints of the twist-3 LCDAs in the hard spectator
scattering. We point out that the decay amplitudes of B --> PP predicted by QCD
factorization are really free of the renormalization scale dependence, at least
at the order of alpha_s. At last, we briefly compare the QCD factorization with
the generalized factorization and PQCD method.


title:
Coulomb corrections and multiple e+e- pair production in
  ultra-relativistic nuclear collisions

abstract:
  We consider the problem of Coulomb corrections to the inclusive cross
section. We show that these corrections in the limiting case of small charge
number of one of the nuclei coincide with those to the exclusive cross section.
Within our approach we also obtain the Coulomb corrections for the case of
large charge numbers of both nuclei.


title:
Heavy quarkonium production in double Pomeron exchange processes in
  perturbative QCD

abstract:
  We calculate the heavy quarkonium production in double pomeron exchange
processes in perturbative QCD by using two-gluon exchange model. For the
$P$-wave $\chi_J$ productions, we find $\chi_1$ and $\chi_2$ production
amplitudes which vanish in the forward scattering limit. We also calculate
direct $J/\psi(\Upsilon)+\gamma$ production in the same approach, and these
direct contributions are much smaller than the feeddown contributions from the
$P$-wave states.