title:
One-loop Neutron Electric Dipole Moment from Supersymmetry without
  R-parity

abstract:
  We present a detailed analysis together with exact numerical calculations on
one-loop contributions to neutron electric dipole moment from supersymmetry
without R-parity, focusing on the gluino, chargino, and neutralino
contributions. Apart from the neglected family mixing among quarks, complete
formulae are given for the various contributions, through the quark dipole
operators, to which the present study is restricted. We discuss the structure
and main features of the R-parity violating contributions and the interplay
between the R-parity conserving and violating parameters. In particular, the
parameter combination $\mu_i^*\lambda^{\prime}_{i11}$, under the optimal
parametrization adopted, is shown to be solely responsible for the R-parity
violating contributions in the supersymmetric loop diagrams. While
$\mu_i^*\lambda^{\prime}_{i11}$ could bear a complex phase, the latter is not
necessary to have a R-parity violating contribution.


title: Studies of s-channel Resonances at the CLIC Multi-TeV e+e- Collider

abstract:
  Several models predict the existence of new resonances in the multi-TeV
region, which should be accessible in e+e- collisions by s-channel production.
In this paper, we review the phenomenology of some specific models and we
present a preliminary study of the potential of the future CLIC collider for
the determination of their nature and properties.


title:
Enhanced Minijet Production in $A-A$ Collisions from Gluons with Large
  Transverse Momenta

abstract:
  We find supersaturation for the intrinsic gluon distribution of nuclei, i.e.
the low $x$ unintegrated nuclear gluon distribution peaks at intermediate
transverse momenta $k_t=Q_s$ and vanishes at zero $k_t$. Taking into account
the intrinsic transverse momenta of the gluons and the saturation scale $p_s$
of the produced gluons, we calculate the minijet cross section arising from
gluon gluon scattering for RHIC energies. For central collisions at
$\sqrt{s}=200GeV$ the saturation scale $p_s \approx 1.4$ GeV is larger due to
intrinsic $k_t$ effects and increases with energy. Our theoretical results on
charged particle multiplicity agree very well with the recent experimental data
from RHIC.


title: Solar neutrinos with magnetic moment and solar field profiles

abstract:
  A statistical analysis of the pre-SNO solar neutrino data is made assuming
the solar neutrino deficit to be resolved by the interaction of the neutrino
magnetic moment with the solar magnetic field. Given the general
characteristics of the field profiles known to lead to the best event rate
predictions, several specific choices of profiles are assumed and fits to the
rates, to the electron recoil spectrum in SuperKamiokande and to the combined
rates and spectrum are performed. Both the rate and spectrum fits are
remarkably better than in a previous analysis of the magnetic moment solution
which used a former standard solar model and previous data, and in particular,
rate fits are far better than those from oscillations. The global analysis also
reflects the general very good quality of the fits.


title: Koenigs function and branching processes

abstract:
  An explicit solution of time-homogeneous pure birth branching processes is
described. It gives alternative extensions for the negative binomial
distribution (branching processes with immigration) and for the Furry-Yule
distribution (branching processes without immigration).


title: Charming penguin contributions to B => K \pi

abstract:
  We present calculations of the charming-penguin long-distance contributions
to B => K \pi decays due to intermediate charmed meson states. Our calculation
is based on the Chiral Effective Lagrangean for light and heavy mesons,
corrected for the hard pion and kaon momenta. We find that the charming-penguin
contributions increase significantly the B => K \pi decay rates in comparison
with the short-distance contributions, giving results in better agreement with
experimental data.


title: A Status Review of Inflationary Cosmology

abstract:
  The first aim of this lecture is to highlight two areas of recent progress in
inflationary cosmology, namely reheating and the quantum theory of cosmological
perturbations. The second aim is to discuss important conceptual problems for
the current realizations of inflation based on fundamental scalar matter
fields, and to present some new approaches at solving these problems.


title: Sphalerons in Two Higgs Doublet Theories

abstract:
  We undertake a comprehensive investigation of the properties of the sphaleron
in electroweak theories with two Higgs doublets. We do this in as
model-independent a way as possible: by exploring the physical parameter space
described by the masses and mixing angles of the Higgs particles. If there is a
large split in the masses of the neutral Higgs particles, there can be several
sphaleron solutions, distinguished by their properties under parity and the
behaviour of the Higgs field at the origin. In general, these solutions appear
in parity conjugate pairs and are not spherically symmetric, although the
departure from spherical symmetry is small. Including CP violation in the Higgs
potential can change the energy of the sphaleron by up to 14 percent for a
given set of Higgs masses, with significant implications for the baryogenesis
bound on the mass of the lightest Higgs.


title: Supersymmetric effects in rare semileptonic decays of B and K mesons

abstract:
  Rare flavour-changing neutral-current transitions of the type $s \to d
\ell^+\ell^-(\nu\bar\nu)$ and $b \to s \ell^+\ell^-(\nu\bar\nu)$ are analysed
in supersymmetric extensions of the Standard Model with generic flavour
couplings. It is shown that these processes are particularly sensitive to the
left--right mixing of the squarks and that, in the presence of non-universal
$A$ terms, they could lead to unambiguous signatures of new physics in
exclusive $K$ and $B$ meson decays.


title: Theoretical Overview: Motivations for Lepton Flavor Violation

abstract:
  In the coming years, experiments underway will increase the sensitivity to
charged lepton flavor violation by four orders of magnitude. These experiments
will stringently probe weak scale physics. I review the status of global
symmetries in the standard model and present several well-motivated models that
predict observable lepton flavor violation. Finally, I describe what we might
learn from future experimental results, whether positive or null.


title: Third Generation Seesaw Mixing with new Vector-Like Weak-Doublet Quarks

abstract:
  We present a class of models with a third generation seesaw mixing with new
vector-like weak-doublet quarks. We analyze a low-energy phenomenology and
present several strong dynamics, high-energy realizations of these models. In
the Topcolor type scenario, named Top-Bottom Color, we obtain an effective,
composite two Higgs doublet model where the third generation isospin splitting
is introduced via tilting interactions related to the broken non-abelian gauge
groups (i.e. without strong, triviality-sensitive U(1) groups). In addition, we
discuss $t\bar{t}$ production at the Next Linear Collider (NLC) and suggest how
one can experimentally observe and distinguish between the weak-doublet and the
weak-singlet types of seesaw mixing.


title:
Two-Loop Master Integrals for $\gamma^* \to 3$ Jets: The non-planar
  topologies

abstract:
  The calculation of the two-loop corrections to the three-jet production rate
and to event shapes in electron--positron annihilation requires the computation
of a number of two-loop four-point master integrals with one off-shell and
three on-shell legs. Up to now, only those master integrals corresponding to
planar topologies were known. In this paper, we compute the yet outstanding
non-planar master integrals by solving differential equations in the external
invariants which are fulfilled by these master integrals. We obtain the master
integrals as expansions in $\e=(4-d)/2$, where $d$ is the space-time dimension.
The fully analytic results are expressed in terms of the two-dimensional
harmonic polylogarithms already introduced in the evaluation of the planar
topologies.


title: The source of the "third flow component"

abstract:
  A model for energy, pressure and flow velocity distributions at the beginning
of relativistic heavy ion collisions has been developed to be used as initial
condition for hydrodynamical calculations. The results show that at the early
stages QGP forms a tilted disk, such that the direction of the largest pressure
gradient stays in the reaction plane, but deviates from both the beam and the
usual transverse flow directions. Such initial conditions may lead to the
creation of the "antiflow" or the "third flow component".


title:
Next-to-leading order mass effects in QCD Compton process of polarized
  DIS

abstract:
  The method originally developed for the exact calculations in QED theory is
applied for the calculation of NLO effects in QCD Compton processes. QCD
corrections to the structure functions and sum rules are obtained. Different
interpretations of the NLO effects due to finite quark mass are discussed.


title:
QCD Isospin Breaking in Meson Masses, Decay Constants and Quark Mass
  Ratios

abstract:
  The procedure to calculate masses and matrix-elements in the presence of
mixing of the basis states is explained in detail. We then apply this procedure
to the two-loop calculation in Chiral Perturbation Theory of pseudoscalar
masses and decay constants including quark mass isospin breaking. These results
are used to update our analysis of $K_{\ell4}$ done previously and obtain a
value of $m_u/m_d$ in addition to values for the low-energy-constants $L_i^r$.


title: The improved nuclear parton distributions

abstract:
  In this paper we propose an improvement of the EKS nuclear parton
distributions for the small x region of high energy processes, where the
perturbative high parton density effects cannot be disregarded. We analyze the
behavior of the ratios $xG_A/xG_N$ and $F_2^A/F_2^D$ and verify that at small x
they are strongly modified when compared to the EKS predictions. The
implications of our results for the heavy ion collisions in RHIC and LHC are
discussed.


title:
Deuteron photodisintegration within the Quark-Gluon Strings Model and
  QCD motivated nonlinear Regge trajectories

abstract:
  We investigate deuteron two-body photodisintegration within the framework of
the Quark-Gluon Strings Model with nonlinear baryon Regge trajectories. Special
attention is paid to the use of QCD motivated Regge trajectories of the
logarithmic and square-root form which have been suggested recently by
Brisudov\'{a}, Burakovsky and Goldman. We find that the recent experimental
data from TJNAF in the few GeV region can reasonably be described by the model.
Angular distributions at different $\gamma$-energies are presented and the
effect of a forward-backward asymmetry is discussed. Predictions for the energy
dependence of $d\sigma/dt$ at higher energies and different $\Theta_{cm}$ are
presented, too.


title: Spatial gradients in the cosmological constant

abstract:
  It is possible that there may be differences in the fundamental physical
parameters from one side of the observed universe to the other. I show that the
cosmological constant is likely to be the most sensitive of the physical
parameters to possible spatial variation, because a small variation in any of
the other parameters produces a huge variation of the cosmological constant. It
therefore provides a very powerful {\em indirect} evidence against spatial
gradients or temporal variation in the other fundamental physical parameters,
at least 40 orders of magnitude more powerful than direct experimental
constraints. Moreover, a gradient may potentially appear in theories where the
variability of the cosmological constant is connected to an anthropic selection
mechanism, invoked to explain the smallness of this parameter. In the Hubble
damping mechanism for anthropic selection, I calculate the possible gradient.
While this mechanism demonstrates the existence of this effect, it is too small
to be seen experimentally, except possibly if inflation happens around the
Planck scale.


title: Cosmological Constraints on Large Extra Dimensions

abstract:
  We calculate the production of massive Kaluza-Klein(KK) modes via
nucleon-nucleon gravi-bremsstrahlung in the early universe. Overproduction of
these states would result in early matter domination and therefore a low age
for the universe so it is possible to place constraints on the number and size
of large extra dimensions. The constraints are stronger than those from Sn1987a
- for 2 large extra dimensions and T_QCD=170 MeV, we show the fundamental scale
must be larger than 1,000 TeV.


title: Light quark masses: a status report at DPF 2000

abstract:
  A summary of the extraction of light quark masses from both QCD sumrules and
lattice QCD simulations is presented. The focus is on providing a careful
statement of the potential weaknesses in each calculation, and on integrating
the work of different collaborations to provide a coherent picture.


title:
Intrinsic Broadening of the Transverse Momentum Spectra in
  Ultrarelativistic Heavy-Ion Collisions?

abstract:
  The mean transverse momentum in high energy nuclear collisions is studied.
The formation of a Color Glass Condensate results in an increase of the square
of the mean transverse momentum with the charged multiplicity per unit rapidity
and unit transverse area. This prediction is in agreement with the presently
available data, in particular with the heavy-ion data, lending support to the
notion that the transverse momentum spectra in ultrarelativistic collisions of
heavy nuclei might be controlled by intrinsic transverse momentum broadening
and not by hadronic rescattering, i.e. transverse flow.


title: 'Steckbrief' Lambda

abstract:
  The phenomenology of the FLRW models with non-vanishing cosmological constant
(CC) is briefly surveyed in the light of the recent astrophysical and
cosmological observations. A subset of these models, which probably includes
the world where we live, is singled out by the combined data from high redshift
Type Ia supernovae, CMBR and the cosmic inventory of matter in our universe.
The kinematical success of a non-vanishing CC, however, leaves open many
dynamical questions in quantum field theory. A semiclassical renormalization
group approach to the CC might perhaps shed some light on them. In this
context, the CC is naturally non-zero simply because it is a running parameter.


title: Precision Higgs Physics at a Future Linear Collider

abstract:
  Assuming that a Higgs sector is responsible for electroweak symmetry
breaking, we attempt to address two important questions: How much better
precision are various measurements of Higgs boson properties at a future linear
collider than at the LHC? What can a future linear collider do for Higgs
physics that the LHC cannot?


title: Radial and elliptic flow at RHIC: further predictions

abstract:
  Using a hydrodynamic model, we predict the transverse momentum dependence of
the spectra and the elliptic flow for different hadrons in Au+Au collisions at
sqrt(s) = 130 A GeV. The dependence of the differential and p_t-integrated
elliptic flow on the hadron mass, equation of state and freeze-out temperature
is studied both numerically and analytically.


title:
Tests of physics beyond the Standard Model with future low energy
  neutrino experiments

abstract:
  Neutrino-electron scattering can be used to probe neutrino electromagnetic
properties at low-threshold underground detectors with good recoil electron
energy resolution. We study the sensitivity of Helium detector experiments,
such as HELLAZ, for artificial anti-neutrino sources. We show that, for a
$^{90}Sr-Y$ source, one expects a sensitivity to the neutrino magnetic moment
at the level of $\mu_{\nu}= 2 \times 10^{-11}\mu_{B}$. We also report the
sensitivity that these experiments could have in searching for an additional
gauge boson in $E_6$ models.


title: Inelastic Dark Matter

abstract:
  Many observations suggest that much of the matter of the universe is
non-baryonic. Recently, the DAMA NaI dark matter direct detection experiment
reported an annual modulation in their event rate consistent with a WIMP relic.
However, the Cryogenic Dark Matter Search (CDMS) Ge experiment excludes most of
the region preferred by DAMA. We demonstrate that if the dark matter can only
scatter by making a transition to a slightly heavier state (Delta m ~ 100kev),
the experiments are no longer in conflict. Moreover, differences in the energy
spectrum of nuclear recoil events could distinguish such a scenario from the
standard WIMP scenario. Finally, we discuss the sneutrino as a candidate for
inelastic dark matter in supersymmetric theories.


title: Non-Annihilation Processes, Fermion-Loop and QED Radiation

abstract:
  The bulk of large radiative corrections to any process can be obtained by
promoting coupling constants to be running ones and by including QED radiation
at the leading logarithmic level via structure functions evoluted at some
scale. The problem of fixing the proper scale in running coupling constants and
in structure functions for non-annihilation processes is briefly addressed and
the general solution is analyzed.


title: Spinor techniques for massive fermions with arbitrary polarization

abstract:
  We present a new variant of the spinor techniques for calculating the
amplitudes of processes involving massive fermions with arbitrary polarization.
It is relatively simple and leads to basic spinor products. Our procedure is
not more complex than CALCUL spinor techniques for massless fermions. We obtain
spinor Chisholm identities for massive fermions. As an illustration,
expressions are given for the amplitudes of electron-positron annihilation into
fermions-pairs for several polarizations.


title:
The Kalman-Tran-D'Souza Model and the Semileptonic Decay Rates of Heavy
  Baryons

abstract:
  We present an investigation of the inclusive semileptonic decay widths of the
heavy baryons Lambda_Q and Xi_Q, (Q=b,c) performed within a relativistic
constituent quark model, formulated on the light-front. In a way conceptually
similar to the deep-inelastic scattering case, the H_Q baryon inclusive width
is expressed as the integral of the free Q-quark partial width multiplied by a
bound-state factor related to the Q-quark distribution function in the H_Q. The
non-perturbative meson structure is described through the quark-model wave
functions, constructed via the Hamiltonian light-front formalism using as input
the Kalman-Tran-D'Souza equal time wave functions. A link between spectroscopic
quark models and the H_Q decay physics is obtained in this way. It is shown
that the bound-state effects and the Fermi motion of the b-quark remarkably
reduce the decay rate with respect to the free-quark result. Our predictions
for the BR(Lambda_c ->X_s e nu_e) and BR(Lambda_b->X_c e nu_e) decays are in
good agreement with existing data.


title: Screening Corrections in Photo and DIS Production of $J/\Psi$

abstract:
  Photo and DIS production of $J/\Psi$ are investigated and compared with
calculations based on pQCD in the LLA approximation without and with screening
corrections. The calculation includes corrections induced by the real part of
the production amplitude, the skewed (off diagonal) gluon structure function
and the relativistic Fermi motion within the charmonium system. Our pQCD
results are also compared with the predictions obtained from a Regge type two
Pomeron model. Our results suggest some preference for our screened model, but
the available data does not enable us to exclude any of the three models we
have examined. The properties of these models, when extrapolated to both low
and very high energies may provide a more effective discrimination between the
different parameterizations.


title: Small, Dense Quark Stars from Perturbative QCD

abstract:
  As a model for nonideal behavior in the equation of state of QCD at high
density, we consider cold quark matter in perturbation theory. To second order
in the strong coupling constant, $\alpha_s$, the results depend sensitively on
the choice of the renormalization mass scale. Certain choices of this scale
correspond to a strongly first order chiral transition, and generate quark
stars with maximum masses and radii approximately half that of ordinary neutron
stars. At the center of these stars, quarks are essentially massless.


title:
Hamiltonian lattice QCD at finite density: equation of state in the
  strong coupling limit

abstract:
  The equation of state of Hamiltonian lattice QCD at finite density is
examined in the strong coupling limit by constructing a solution to the
equation of motion corresponding to an effective Hamiltonian describing the
ground state of the many body system. This solution exactly diagonalizes the
Hamiltonian to second order in field operators for all densities and is used to
evaluate the vacuum energy density from which we obtain the equation of state.
We find that up to and beyond the chiral symmetry restoration density the
pressure of the quark Fermi sea can be negative indicating its mechanical
instability. Our result is in qualitative agreement with continuum models and
should be verifiable by future lattice simulations of strongly coupled QCD at
finite density.


title: Recent BCP progress in Taiwan

abstract:
  I review theoretical progresses on $B$ physics and CP violation which were
made in Taiwan recently. I concentrate on the approaches to exclusive $B$ meson
decays based on factorization assumption, SU(3) symmetry, perturbative QCD
factorization theorem, QCD factorization, and light-front QCD formalism.


title: Glueball States in a Constituent Gluon Model

abstract:
  In a model with dynamical gluon mass, we investigate the bound states of two
and three gluons via a Schr\"odinger equation. The short distance potential is
approximated by one-gluon-exchange while the long distance part is assumed to
be of a breakable string. We estimate the masses and in particular the {\it
sizes} of low-lying bound states with no orbital angular momentum. By
considering quantum-mechanical smearing of the gluon fields and normalizing to
lattice results on $M_{0^{++}}$ and $M_{2^{++}}$, we find that the $0^{++}$
glueball is rather small in size compared with the others. The fitted gluon
mass is of order 600 to 700 MeV, which is reasonable. The 3-gluon glueballs
$0^{-+}$, $1^{--}$ and $3^{--}$ states are nearly degenerate, and their mass
ratio with $2^{++}$ is largely independent of all parameters and consistent
with lattice calculations. We estimate the mass of $1^{--}$ glueball to be
$3.1-3.7$ GeV, which is close to the mass of $J/\psi$ and $\psi^\prime$.


title: Progress on two-loop non-propagator integrals

abstract:
  At variance with fully inclusive quantities, which have been computed already
at the two- or three-loop level, most exclusive observables are still known
only at one loop, as further progress was hampered up to very recently by the
greater computational problems encountered in the study of multi-leg amplitudes
beyond one loop. We discuss the progress made lately in the evaluation of
two-loop multi-leg integrals, with particular emphasis on two-loop four-point
functions.


title: Degenerate and Other Neutrino Mass Scenarios and Dark Matter

abstract:
  I discuss in this talk mainly three topics related with dark matter motivated
neutrino mass spectrum and a generic issue of mass pattern, the normal versus
the inverted mass hierarchies. In the first part, by describing failure of a
nontrivial potential counter example, I argue that the standard 3 $\nu$ mixing
scheme with the solar and the atmospheric $\Delta m^2$'s is robust. In the
second part, I discuss the almost degenerate neutrino (ADN) scenario as the
unique possibility of accommodating dark matter mass neutrinos into the 3 $\nu$
scheme. I review a cosmological bound and then reanalyze the constraints
imposed on the ADN scenario with the new data of double beta decay experiment.
In the last part, I discuss the 3 $\nu$ flavor transformation in supernova (SN)
and point out the possibility that neutrinos from SN may distinguish the normal
versus inverted hierarchies of neutrino masses. By analyzing the neutrino data
from SN1987A, I argue that the inverted mass hierarchy is disfavored by the
data.


title: The Generalized Gell-Mann--Low Theorem for Relativistic Bound States

abstract:
  The recently established generalized Gell-Mann--Low theorem is applied in
lowest perturbative order to bound-state calculations in a simple scalar field
theory with cubic couplings. The approach via the generalized Gell-Mann--Low
Theorem retains, while being fully relativistic, many of the desirable features
of the quantum mechanical approaches to bound states. In particular, no
abnormal or unphysical solutions are found in the model under consideration.
Both the non-relativistic and one-body limits are straightforward and
consistent. The results for the spectrum are compared to those of the
Bethe-Salpeter equation (in the ladder approximation) and related equations.


title: Contact interactions and polarized beams at a Linear Collider

abstract:
  We discuss contact-interaction searches in the processes e^+e^-\to
\mu^+\mu^-, b\bar{b} and c\bar{c} at an e^+e^- Linear Collider with c.m. energy
\sqrt{s}=0.5 TeV and with longitudinally polarized beams. The measurement of
polarized cross sections allows to study the individual helicity cross
sections, and consequently to derive separate, model-independent, constraints
on the four-fermion contact interaction couplings. We evaluate the reach on
those parameters foreseeable in the case of both electron and positron
polarization fixed at some reference values, and compare it with the situation
where only electron polarization is available. The analysis is based on
polarized integrated cross sections with optimal kinematical cuts that can
improve the sensitivity to the relevant couplings. While electron polarization
would by itself allow such an analysis, the additional positron polarization
(with no loss of beam intensity) and optimization can have a crucial role in
improving the sensitivity to the new interactions.


title: Leptogenesis with SU(5)-inspired mass matrices

abstract:
  In the baryogenesis via leptogenesis framework the baryonic asymmetry depends
on lepton mass matrices. In a previous paper we used SO(10)-inspired mass
matrices and we found few possibilities to obtain a sufficient level of
asymmetry. In the present paper we use SU(5)-inspired mass matrices, which also
allow to check the dependence of the baryonic asymmetry on Dirac neutrino
masses. In particular, we find that the large mixing matter solution to the
solar neutrino problem, which within SO(10) gives too small asymmetry, can now
be favoured.


title:
`Strategy of Regions': Expansions of Feynman Diagrams both in Euclidean
  and Pseudo-Euclidean Regimes

abstract:
  The strategy of regions [1] turns out to be a universal method for expanding
Feynman integrals in various limits of momenta and masses. This strategy is
reviewed and illustrated through numerous examples. In the case of typically
Euclidean limits it is equivalent to well-known prescriptions within the
strategy of subgraphs. For regimes typical for Minkowski space, where the
strategy of subgraphs has not yet been developed, the strategy of regions is
characterized in the case of threshold limit, Sudakov limit and Regge limit.


title: Test of QCD Predictions for Multiparticle Production at LEP

abstract:
  I discuss various QCD tests for multiparticle production, such as
multiplicities, dead-cone effect and inclusive spectra. The common feature of
all these predictions is the crucial importance of coherence effect to be taken
into account.


title: Photonic and Leptonic Rare B Decays

abstract:
  Some selected topics involving photonic and leptonic rare B decays are
reviewed. The interest in their measurement for the CKM phenomenology is
underlined. They are also potentially interesting in searching for physics
beyond the standard model. This is illustrated on the examples of the decays $B
\to (K,K^*) \ell^+ \ell^-$ and $B \to (\rho, \omega) \gamma$ by contrasting
their anticipated phenomenological profiles in the standard model and some
variants of supersymmetric models.


title: Nielsen-Olesen vortex in varying-alpha theories

abstract:
  We consider soliton solutions to Bekenstein's theory, for which the fine
structure constant $\alpha=e^2/(4\pi\hbar c)$ is allowed to vary due to the
presence of a dielectric field pervading the vacuum. More specifically we
investigate the effects of a varying $\alpha$ upon a complex scalar field with
a U(1) electromagnetic gauge symmetry subject to spontaneous symmetry breaking.
We find vortex solutions to this theory, similar to the Nielsen-Olesen vortex.
Near the vortex core the electric charge is typically much larger than far away
from the string, lending these strings a superconducting flavour. In general
the dielectric field coats the usual local string with a global string
envelope. We discuss the cosmological implications of networks of such strings,
with particular emphasis on their ability to generate inhomogeneous
recombination scenarios. We also consider the possibility of the dielectric
being a charged free field. Even though the vacuum of such a field is trivial,
we find that the dielectric arranges itself in the shape of a local string,
with a quantized magnetic flux at the core -- presumably borrowing these
topological features from the underlying Nielsen-Olesen vortex.


title:
The charge and mass perturbative renormalization in explicitly covariant
  LFD

abstract:
  In several preceding studies, the explicitly covariant formulation of light
front dynamics was developed and applied to many observables. In the present
study we show how in this approach the renormalization procedure for the first
radiative correction can be carried out in a standard way, after separating out
the contributions depending on the orientation of the light-front plane. We
calculate the renormalized QED vertices $\gamma e^-\to e^-$ and $e^+e^-\to
\gamma $ and the electron self-energy and recover, in a straightforward way,
the well known analytical results obtained in the Feynman approach.


title: RG generated fermion mass

abstract:
  Chiral symmetry breaking in a purely fermionic theory is investigated by the
help of the renormalization group method. The RG equation for the running mass
$m_k$ admits a solution with vanishing bare mass and finite physical mass. The
running Fermi coupling constant, $G_k$, converges to a finite (renormalized)
physical value. It is also shown that the RG equation for $\tilde G$, the
dimensionless Fermi coupling, has an UV fixed point $\tilde G_{UV}$. Contrary
to a previous result however, it is proven that the chiral symmetry breaking
point $\tilde G_c$ does not coincide with $\tilde G_{UV}$.


title:
A Phenomenological Analysis of Gluon Mass Effects in Inclusive Radiative
  Decays of the $\rm{J/\psi}$ and $\Upsilon

abstract:
  The shapes of the inclusive photon spectra in the processes $\Jp \to \gamma
X$ and $\Up \to \gamma X$ have been analysed using all available experimental
data.
  Relativistic, higher order QCD and gluon mass corrections were taken into
account in the fitted functions. Only on including the gluon mass corrections,
were consistent and acceptable fits obtained. Values of
$0.721^{+0.016}_{-0.068}$ GeV and $1.18^{+0.09}_{-0.29}$ GeV were found for the
effective gluon masses (corresponding to Born level diagrams) for the $\Jp$ and
$\Up$ respectively. The width ratios $\Gamma(V \to {\rm hadrons})/\Gamma(V \to
\gamma+ {\rm hadrons}) V=\Jp, \Up$ were used to determine $\alpha_s(1.5 {\rm
GeV})$ and $\alpha_s(4.9 {\rm GeV})$. Values consistent with the current world
average $\alpha_s$ were obtained only when gluon mass correction factors,
calculated using the fitted values of the effective gluon mass, were applied. A
gluon mass $\simeq 1$ GeV, as suggested with these results, is consistent with
previous analytical theoretical calculations and independent phenomenological
estimates, as well as with a recent, more accurate, lattice calculation of the
gluon propagator in the infra-red region.


title: Anomaly Mediated Supersymmetry Breaking, D-terms and R-symmetry

abstract:
  We explore two distinct resolutions to the tachyonic slepton puzzle in the
Anomaly Mediated Supersymmetry Breaking scenario. Both are based on extending
the MSSM by an anomaly free U(1) symmetry, and in both cases exact RG
invariance is preserved.


title: A model for decoherence of entangled beauty

abstract:
  In the context of the entangled $B^0 \bar B^0$ state produced at the
$\Upsilon(4S)$ resonance, we consider a modification of the usual
quantum-mechanical time evolution with a dissipative term, which contains only
one parameter denoted by $\lambda$ and respects complete positivity. In this
way a decoherence effect is introduced in the time evolution of the 2-particle
$B^0 \bar B^0$ state, which becomes stronger with increasing distance between
the two particles. While our model of time evolution has decoherence for the
2-particle system, we assume that, after the decay of one of the two B mesons,
the resulting 1-particle state obeys the purely quantum-mechanical time
evolution. From the data on dilepton events we derive an upper bound on
$\lambda$. We also show how $\lambda$ is related to the so-called ``decoherence
parameter'' $\zeta$, which parameterizes decoherence in neutral flavoured
meson--antimeson systems.


title:
Bose-Einstein correlations in cascade processes and non-extensive
  statistics

abstract:
  We discuss the effect of nonextensivity of the emitting source on the
Bose-Einstein correlations (BEC). This is done numerically by comparing cascade
hadronization model (CAS), which is known to exhibit fractal structure in both
space-time and phase-space, with its equivalent obtained from the information
theory approach (MaxEnt), in which hadronization proceeds uniformly in the
phase-space. To this end we have developed a new method of accounting for BEC
in Monte Carlo event generators, which preserves all kinematics of the
hadronization process.


title: Probing for the Charm Content of $B$ and $\Upsilon$ Mesons

abstract:
  A slow $J/\psi$ bump exists in the inclusive $B\to J/\psi + X$ spectrum,
while the softness of $J/\psi$ spectrum in $\Upsilon(1S) \to J/\psi + X$ decay
is in strong contrast with expectations from color octet mechanism. We propose
{\it intrinsic} charm as the explanation:the former is due to $\bar B\to J/\psi
D \pi$,with three charm quarks in the final state; the latter is just a small
fraction of $\Upsilon(1S) \to (c\bar c)_{\rm slow} + 2$"jet" events, where the
slow moving $c\bar c$ system evolves into $D^{(*)}$ pairs. Experimental search
for these phenomena at B Factories and the Tevatron is strongly urged, as the
implications go beyond QCD.


title: On particle production for high energy neutrino beams

abstract:
  Analytical formulae for the calculation of secondary particle yields in p-A
interactions are given. These formulae can be of great practical importance for
fast calculations of neutrino fluxes and for designing new neutrino beam-lines.
The formulae are based on a parameterization of the inclusive invariant cross
sections for secondary particle production measured in p-Be interactions. Data
collected in different energy ranges and kinematic regions are used. The
accuracy of the fit to the data with the empirical formulae adopted is within
the experimental uncertainties. Prescriptions to extrapolate this
parameterization to finite targets and to targets of different materials are
given. The results obtained are then used as an input for the simulation of
neutrino beams. We show that our approach describes well the main
characteristics of measured neutrino spectra at CERN. Thus it may be used in
fast simulations aiming at the optimisation of the proposed long-baseline
neutrino beams at CERN and FNAL. In particular we will show our predictions for
the CNGS beam from CERN to Gran Sasso.


title:
Next-to-leading Order Calculation of Associated Production of Gauginos
  and Gluinos

abstract:
  Results are presented of a next-to-leading order calculation in perturbative
QCD of the production of charginos and neutralinos in association with gluinos
at hadron colliders. Predictions for total and differential cross sections are
shown at the energies of the Fermilab Tevatron and CERN Large Hadron Collider
for a typical supergravity model of the sparticle mass spectrum and for a light
gluino model.


title: Precision Studies of the Higgs Boson Profile at the e+e- Linear Collider

abstract:
  This paper reviews the potential of a high luminosity e+e- linear collider
(LC) in the precision study of the Higgs boson profile. The complementarity of
the linear collider data with that from the LHC is also discussed together with
a comparison with a muon collider.


title: Isospin Symmetry Breaking in \rho\to\pi\gamma Decay

abstract:
  In terms of effective field theory and mixed propagator approach, we show
that there is a larger hidden effect of isospin breaking in
$\rho^0\to\pi^0\gamma$ decay due to an $\omega$ exchange,
$\rho^0\to\omega\to\pi^0\gamma$. The branching ratio is predicted as
$B(\rho^0\to\pi^0\gamma)=(11.67\pm 2.0)\times 10^{-4}$, which is much larger
than Partcile Data Group's datum $(6.8\pm 1.7)\times 10^{-4}$ and one of
charged mode, $B(\rho^\pm\to\pi^\pm\gamma)=(4.5\pm 0.5)\times 10^{-4}$.


title: Nonlinear Landau damping of a plasmino in the quark-gluon plasma

abstract:
  On the basis of the Blaizot-Iancu equations, which are a local formulation of
the hard thermal loop (HTL) equations of motion for soft fluctuating quark and
gluon fields and their induced sources, the coupled kinetic equations for
plasminos and plasmons are obtained. The equality of matrix elements for
nonlinear scattering of a plasmino by hard particles in covariant and temporal
gauges is established by using effective Ward identities. The model problem of
the interaction of two infinitely narrow packets with fermion and boson quantum
numbers is considered. The kinematical relations between wave vectors of the
plasmino and plasmon are derived, when the effective pumping over of the plasma
excitation energy from the fermion branch of plasma excitations to the boson
branch and vice versa occur. The expression for the nonlinear Landau damping
rate of a plasmino at rest is found, and a comparison with a plasmino damping
constant obtained within the framework of the hard thermal loop approximation
is made. The nonlinear Landau damping rate for normal quark excitations is
shown to diverge like $1/\sqrt{q^2}$ near the light cone where $q$ is a
four-momentum of excitations, and the improved Blaizot-Iancu equations removing
this divergence are proposed.


title: Why the Quark-Gluon Plasma isn't a Plasma

abstract:
  An alternate picture of the deconfined phase of gauge theories is described.
Instead of a plasma, the theory is viewed as a condensate of Polyakov lines.
The pressure is determined by an elementary mean field theory.


title: QCD-improved factorization in nonleptonic B decays

abstract:
  I consider nonleptonic decays of B mesons into two light mesons using the
light-cone wave functions for the mesons. In the heavy quark limit,
nonfactorizable contributions are calculable from first principles in some
decay modes. I review the idea of the QCD-improved factorization method and
discuss the implications in phenomenology.


title: Lepton Flavor Violation and Radiative Neutrino Masses

abstract:
  Lepton flavor violation in various sectors of the theory can bring important
effects on neutrino masses and mixing through wave function renormalization. We
examine general conditions for flavor structure of radiative corrections
producing the atmospheric and solar neutrino mass splittings from degenerate
mass patterns. Also obtained are the mixing angle relations consistent with the
experimental results.


title:
Rare $\Lambda_{b}\to \Lambda $ l$^{+}$ l$^{-}$ Decays with Polarized
  $\Lambda $

abstract:
  We investigate the rare baryonic exclusive decays of $\Lambda_b\to \Lambda
l^+ l^- (l=e,\mu,\tau)$ with polarized $\Lambda $. Under the approximation of
the heavy quark effective theory (HQET), in the standard model we derive the
differential decay rates and various polarization asymmetries by including
lepton mass effects. We find that with the long-distance effects the decay
branching ratios are $5.3\times 10^{-5}$ for $\Lambda_b\to \Lambda l^+ l^-\
(l=e,\mu)$ and $1.1\times 10^{-5}$ for $\Lambda_b\to \Lambda \tau^+\tau^-$. The
effects of new physics in the decay rates are also discussed. The integrated
longitudinal $\Lambda$ polarizations are -0.31 and -0.12, while that of the
normal ones 0.02 and 0.01, for di-muon and tau modes, respectively. The CP-odd
transverse polarization of $\Lambda$ is zero in the standard model but it is
expected to be sizable in some theories with new physics.


title: Extracting SUSY Parameters from the Higgs Boson Properties

abstract:
  We calculate the ratio of the two branching ratios, Br(h -> bb-bar) and Br(h
-> cc-bar) + Br(h -> gg), in the minimal supersymmetric standard model taking
into account the SUSY-loop corrections to the Higgs sector and the hbb-bar
vertex. We show that the heavy Higgs mass can be extracted from the ratio,
almost independently of other SUSY parameters, in the region of tan(beta) ~<
10.


title: Topics on four-fermion Physics at electron-positron colliders

abstract:
  I review the most recent progresses in the calculation of four-fermion
processes in electron-positron collisions


title: Parton interactions in the Bjorken limit of QCD

abstract:
  We consider the Bjorken limit in the framework of the effective action
approach and discuss its similarities to the Regge limit. The proposed
effective action allows for a rather simple calculation of the known evolution
kernels. We represent the result in terms of two-parton interaction operators
involving gluon and quark operators depending on light-ray position and
helicity and analyze their symmetry properties.


title:
Interplay between perturbative and non-perturbative QCD in three-jet
  events

abstract:
  We present the perturbative (PT) and non-perturbative (NP) analysis of the
cumulative out-of-event-plane momentum distribution in e+e- annihilation in the
near-to-planar three-jet region. A physical interpretation based on simple QCD
considerations and kinematical relations will be given, with the aim of
extending the described techniques to other multi-jet processes and, possibly,
to hadron-hadron collisions.


title:
Determination of the Gaugino Mass Parameter M_1 in Different Linear
  Collider Modes

abstract:
  We study the different linear collider modes with regard to the determination
of the gaugino mass parameter M_1. In a specific mSUGRA inspired scenario we
compare four processes with polarized beams: (a) e+ e- --> neutralino_1
neutralino_2 --> neutralino_1 neutralino_1 e+ e-, (b) e- gamma --> neutralino_1
selectron_{L/R} --> neutralino_1 neutralino_1 e-, (c) gamma gamma -->
chargino_1^+ chargino_1^- --> neutralino_1 neutralino_1 e+ e- neutrino_e
anti-neutrino_e, (d) e- e- --> selectron_{L/R} selectron_{L/R} --> neutralino_1
neutralino_1 e- e-.


title: Production of MSSM Higgs Bosons in $\gamma\gamma$ Collisions

abstract:
  The heavy Higgs bosons $H,A$ of the minimal supersymmetric extension of the
Standard Model can be produced as resonances in high-energy $\gamma\gamma$
colliders. Prospects of the search for these particles in $b\bar b$ and
neutralino-pair final states are studied in this report. Heavy Higgs bosons can
be found with masses up to about 70-80% of the initial $e^+e^-$ collider energy
for moderate values of $\tan\beta$, i.e. in areas of the parameter space not
accessible at other colliders.


title: Effective average action in statistical physics and quantum field theory

abstract:
  An exact renormalization group equation describes the dependence of the free
energy on an infrared cutoff for the quantum or thermal fluctuations. It
interpolates between the microphysical laws and the complex macroscopic
phenomena. We present a simple unified description of critical phenomena for
O(N)-symmetric scalar models in two, three or four dimensions, including
essential scaling for the Kosterlitz-Thouless transition.


title: Virtual photon impact factors with exact gluon kinematic

abstract:
  An explicit analytic formula for the transverse and longitudinal impact
factors S_{T,L}(N,\gamma) of the photon using k_T factorization with exact
gluon kinematics is given. Applications to the QCD dipole model and the
extraction of the unintegrated gluon structure function from data are proposed.


title: Mueller-Navelet Jets at Hadron Colliders

abstract:
  We critically examine the definition of dijet cross sections at large
rapidity intervals in hadron-hadron collisions, taking proper account of the
various cuts applied in a realistic experimental setup. We argue that the
dependence of the cross section on the precise definition of the parton
momentum fractions and the presence of an upper bound on the momentum transfer
cannot be neglected, and we provide the relevant modifications to the
analytical formulae by Mueller and Navelet. We also point out that the choice
of equal transverse momentum cuts on the tagging jets can spoil the possibility
of a clean extraction of signals of BFKL physics.


title: A Neutrino Mass Matrix Model with many Quantum charges and No SUSY

abstract:
  We present a model based on our favourite gauge group which we call Anti-GUT
and which in its extended form to be applied for neutrinos in the see-saw
picture consists in that we have for each family separately a set of gauge
fields as in the Standard Model plus a gauged (B-L)-charge. It may function as
a concrete model manifestation of the type of model suggested by some general
statistical considerations as to what a mass matrix model is to be to match
naturally the rough features of the spectrum and the baryon asymmetry so nicely
obtained in see-saw models along the Fukugita-Yanagida scheme.


title: Wavelets and their use

abstract:
  This review paper is intended to give a useful guide for those who want to
apply discrete wavelets in their practice. The notion of wavelets and their use
in practical computing and various applications are briefly described, but
rigorous proofs of mathematical statements are omitted, and the reader is just
referred to corresponding literature. The multiresolution analysis and fast
wavelet transform became a standard procedure for dealing with discrete
wavelets. The proper choice of a wavelet and use of nonstandard matrix
multiplication are often crucial for achievement of a goal. Analysis of various
functions with the help of wavelets allows to reveal fractal structures,
singularities etc. Wavelet transform of operator expressions helps solve some
equations. In practical applications one deals often with the discretized
functions, and the problem of stability of wavelet transform and corresponding
numerical algorithms becomes important. After discussing all these topics we
turn to practical applications of the wavelet machinery. They are so numerous
that we have to limit ourselves by some examples only. The authors would be
grateful for any comments which improve this review paper and move us closer to
the goal proclaimed in the first phrase of the abstract.

categories: hep-ph cond-mat math-ph math.MP math.NA nlin.CD physics.comp-ph


title: On the two-loop electroweak amplitude of the muon decay

abstract:
  We present an analysis of the two-loop amplitude of the muon decay in the
Standard Model (SM) using algebraic renormalization techniques. In addition, we
discuss a manifestly BRST invariant IR regulator for the photon within the SM.


title:
Study of two-photon production process in proton-proton collisions below
  the pion production threshold

abstract:
  The energy spectrum for high energy $\gamma$-rays ($E_\gamma \geq 10$ MeV)
from the process $pp \to \gamma \gamma X$ emitted at $90^0$ in the laboratory
frame has been measured at an energy below the pion production threshold,
namely, at 216 MeV. The resulting photon energy spectrum extracted from $\gamma
- \gamma$ coincidence events consists of a narrow peak at a photon energy of
about 24 MeV and a relatively broad peak in the energy range of (50 - 70) MeV.
The statistical significance for both the narrow and broad peaks exceeds
5$\sigma$. This behavior of the photon energy spectrum is interpreted as a
signature of the exotic dibaryon resonance $d^\star_1$ which is assumed to be
formed in the radiative process $pp \to \gamma d^\star_1$ followed by its
electromagnetic decay via the $d^\star_1 \to pp \gamma$ mode. The experimental
spectrum is compared with those obtained by means of Monte Carlo simulations.


title:
Realistic Gluino Axion Model Consistent with Supersymmetry Breaking at
  the TeV Scale

abstract:
  The recently proposed model of using the dynamical phase of the gluino to
solve the strong CP problem is shown to admit a specific realization in terms
of fundamental singlet superfields, such that the breaking of supersymmetry
occurs only at the TeV scale, despite the large axion scale of 10^{9} to
10^{12} GeV. Phenomenological implications are discussed.


title:
Study of relativistic bound states in a scalar model using
  diagonalization/Monte Carlo methods

abstract:
  We use a recently proposed diagonalization/Monte Carlo computational scheme
to study relativistic two-body and three-body bound states in 1+1 dimensional
phi^6-phi^4 theory. We find that the approach is well-suited for calculating
bound state energies and wavefunctions.


title: Future Summary

abstract:
  We are emerging from a period of consolidation in particle physics. Its
great, historic achievement was to establish the Theory of Matter. This Theory
will serve as our description of ordinary matter under ordinary conditions --
allowing for an extremely liberal definition of "ordinary -- for the
foreseeable future. Yet there are many indications, ranging from the numerical
to the semi-mystical, that a new fertile period lies before us. We will
discover compelling evidence for the unification of fundamental forces and for
new quantum dimensions (low-energy supersymmetry). We will identify new forms
of matter, which dominate the mass density of the Universe. We will achieve
much better fundamental understanding of the behavior of matter in extreme
astrophysical and cosmological environments. Lying beyond these expectations,
we can identify deep questions that seem to call for ideas outside our present
grasp. And there's still plenty of room for surprises.


title:
Regularization-independent study of renormalized non-perturbative
  quenched QED

abstract:
  A recently proposed regularization-independent method is used for the first
time to solve the renormalized fermion Schwinger-Dyson equation numerically in
quenched QED$_4$. The Curtis-Pennington vertex is used to illustrate the
technique and to facilitate comparison with previous calculations which used
the alternative regularization schemes of modified ultraviolet cut-off and
dimensional regularization. Our new results are in excellent numerical
agreement with these, and so we can now conclude with confidence that there is
no residual regularization dependence in these results. Moreover, from a
computational point of view the regularization independent method has enormous
advantages, since all integrals are absolutely convergent by construction, and
so do not mix small and arbitrarily large momentum scales. We analytically
predict power law behaviour in the asymptotic region, which is confirmed
numerically with high precision. The successful demonstration of this efficient
new technique opens the way for studies of unquenched QED to be undertaken in
the near future.


title: Meson Exchange Effect on Color Superconductivity

abstract:
  We investigate the effects of pion and gluon exchanges on the formation of
two-flavor color superconductivity at moderate density, $\mu <1 GeV$. The
chiral quark model proposed by Manohar and Georgi containing pions as well as
gluons is employed to show that the pion exchange reduces substantially the
value of the superconducting gap gotten with the gluon exchange only. It turns
out that the pion exchanges produce a repulsion between quark-quark pair in a
spin and isospin singlet state.
  We suggest that the phase consisiting of pions, gluons and quarks is one of
the candidates of in-medium QCD phase at moderate density.


title: Renormalon Analysis of Heavy-Light Exclusive B Decays

abstract:
  We study two-body exclusive decays of the form B -> D^(*) L (L = \pi, \rho)
in the heavy quark limit. We perform a renormalon analysis of such processes to
determine the order at which nonperturbative factorization-breaking power
corrections enter the amplitude. We find that a class of leading power
corrections to the color octet matrix element, of O(\Lambda_QCD/m_b), vanish in
the limit of a symmetric light meson parton distribution function. We discuss
the phenomenological significance of this result.


title: On propagation of photon in a medium

abstract:
  The equations for variation of the Stokes parameters and intensity of photons
propagating in a medium, whose optical properties may be described by the
permittivity tensor, are derived. Classification of different cases of photon
propagation is suggested on a basis of these equations.


title:
Polarized parton distributions from charged-current deep-inelastic
  scattering and future neutrino factories

abstract:
  We discuss the determination of polarized parton distributions from
charged-current deep-inelastic scattering experiments. We summarize the
next-to-leading order treatment of charged-current polarized structure
functions, their relation to polarized parton distributions and scale
dependence, and discuss their description by means of a next-to-leading order
evolution code. We discuss current theoretical expectations and positivity
constraints on the unmeasured C-odd combinations Delta q-Delta qbar of
polarized quark distributions, and their determination in charged-current
deep-inelastic scattering experiments. We give estimates of the expected errors
on charged-current structure functions at a future neutrino factory, and
perform a study of the accuracy in the determination of polarized parton
distributions that would be possible at such a facility. We show that these
measurements have the potential to distinguish between different theoretical
scenarios for the proton spin structure.


title: Q Rings

abstract:
  We show the existence of new stable ring-like localized scalar field
configurations whose stability is due to a combination of topological and
nontopological charges. In that sense these defects may be called
semitopological. These rings are Noether charged and also carry Noether current
(they are superconducting). They are local minima of the energy in scalar field
theories with an unbroken U(1) global symmetry. We obtain numerical solutions
of the field configuration corresponding to large rings and derive virial
theorems demonstrating their stability. We also derive the minimum energy field
configurations in 3D and simulate the evolution of a finite size Q ring on a
three dimensional lattice thus generalizing our demonstration of stability.


title:
The vector form factor of the pion from unitarity and analyticity: a
  model-independent approach

abstract:
  We study a model-independent parameterization of the vector pion form factor
that arises from the constraints of analyticity and unitarity. Our description
should be suitable up to sqrt(s) ~ 1.2 GeV and allows a model-independent
determination of the mass of the rho(770) resonance, M(rho) = (775.1 +- 0.5)
MeV. We analyse the experimental data on tau(-) -> pion(-) pion(0)
neutrino(tau), in this framework, and its consequences on the low-energy
observables worked out by chiral perturbation theory. An evaluation of the
two-pion contribution to the anomalous magnetic moment of the muon, a_muon, and
to the fine structure constant, alpha(M(Z)^2), is also performed.


title:
Deep Inelastic Scattering of Leptons and Hadrons in the QCD Parton Model
  and Experimental Tests

abstract:
  We present the basic aspects of deep inelastic phenomena in the framework of
the QCD parton model. After recalling briefly the standard kinematics, we
discuss the physical interpretation of unpolarized and polarized structure
functions in terms of parton distributions together with several important sum
rules. We also make a rapid survey of the experimental situation together with
phenomenological tests, in particular concerning various QCD predictions. In
the summary, we try to identify some significant open questions, to clarify
where we stand and to see what we expect to learn in the future.


title:
Baryon Transport in Dual Models and the Possibility of a Backward Peak
  in Diffraction

abstract:
  Dual string models contain significant baryon transfers and seem essentially
consistent with the available data. We here turn to a careful consideration of
the relevant topological structures. The baryon transfer is associated with one
of two possible types of cuts in various baryonium exchanges. As the baryonium
with the highest intercept easily couples to two Pomerons such transfers should
occur abundantly in percolating dense Pomerons systems. From the color
structure this quark-less baryonium can be identified with an Odderon exchange.
As the Odderon is predicted to have an almost Pomeron -like trajectory it has
to involve small coupling constants so that steeper trajectories can initially
determine the data. As this suppression is not anticipated for diffractive
processes a tiny observable backward peak should occur in the initial baryon
distribution for massive diffractive systems.


title: Everyone Makes Mistakes - Including Feynman

abstract:
  This talk is dedicated to Alberto Sirlin in celebration of his seventieth
birthday. I wish to convey my deep appreciation of his many important
contributions to particle physics over 40 years and look forward to many more
years of productive research.


title: Theoretical Aspects of Inclusive Light-Hadron Production

abstract:
  We summarize the key results of a recent global analysis of inclusive
single-charged-hadron production in high-energy colliding-beam experiments. In
the framework of the parton model of quantum chromodynamics at next-to-leading
order (NLO), fragmentation functions (FFs) for charged pions, charged kaons,
and (anti) protons are extracted from experimental data of e^+e^- annihilation
at the Z-boson resonance and at centre-of-mass energy root(s) = 29 GeV. This
fit also yields a new NLO value for the strong-coupling constant, namely
alpha_s^(5)(M_Z) = 0.1170 +- 0.0073. The scaling violations encoded in the FFs
through the Altarelli-Parisi evolution equations are tested by confronting
(e^+e^-)-annihilation data from DESY DORIS, DESY PETRA, and CERN LEP2 with NLO
predictions based on these FFs. Comparisons of p p-bar data from CERN S p p-bar
S and the Fermilab Tevatron, gamma p data from DESY HERA, and gamma gamma data
from LEP2 with the corresponding NLO predictions allow us to test the
universality of the FFs predicted by the factorization theorem.


title: Heavy Quark Production at High Energy

abstract:
  We report on QCD radiative corrections to heavy quark production valid at
high energy. The formulae presented will allow a matched calculation of the
total cross section which is correct at $O(\as^3)$ and includes resummation of
all terms of order $\as^3 [\as \ln (s/m^2)]^n$. We also include asymptotic
estimates of the effect of the high energy resummation. A complete description
of the calculation of the heavy quark impact factor is included in an appendix.


title: The Rydberg-Atom-Cavity Axion Search

abstract:
  We report on the present progress in development of the dark matter axion
search experiment with Rydberg-atom-cavity detectors in Kyoto, CARRACK I and
CARRACK II. The axion search has been performed with CARRACK I in the 8 % mass
range around $ 10 \mu {\rm eV} $, and CARRACK II is now ready for the search in
the wide range $ 2 \mu {\rm eV} - 50 \mu {\rm eV} $. We have also developed
quantum theoretical calculations on the axion-photon-atom system in the
resonant cavity in order to estimate precisely the detection sensitivity for
the axion signal. Some essential features on the axion-photon-atom interaction
are clarified, which provide the optimum experimental setup for the axion
search.


title:
Lepton Asymmetries in Heavy Baryon Decays of $\Lambda_b\to\Lambda
  l^+l^-$

abstract:
  We study the dilepton forward-backward and the longitudinal, normal and
transverse lepton polarization asymmetries in the heavy baryon decays of
$\Lambda_b\to\Lambda l^+l^-$. We show that the asymmetries have a less
dependence on the non-perturbative QCD effects. In the standard model, we find
that the integrated forward-backward asymmetries (FBAs) and three components of
the polarizations in the QCD sum rule approach (pole model) are $-0.13\
(-0.12)$ and $(58.3,-9.4,-0.07)%$ ($(58.3,-12.6,-0.07)%$) for
$\Lambda_b\to\Lambda\mu^+\mu^-$ and $-0.04 (-0.03)$ and $(10.9,-10.0,-0.39)%$
($(10.9,-0.2,-0.34)%$) for $\Lambda_b\to\Lambda\tau^+\tau^-$, respectively.


title: Aspects of Non-Equilibrium Dynamics in Quantum Field Theory

abstract:
  This work is devoted to the study of relaxation--dissipation processes in
systems described by Quantum Field Theory. In the first part, I focus on the
phi^4 scalar quantum field theory in finite volume in the large N limit. I find
that the zero-mode quantum fluctuations cannot grow macroscopically large
starting from microscopic initial conditions, while the long-wavelength
fluctuations do scale with the linear size of the system, signalling dynamical
infrared properties quite different from the equilibrium ones. I also introduce
a non-gaussian Hartree-Fock approximation (tdHF) and I derive the mean-field
coupled time-dependent Schroedinger equations for the modes of the scalar
field. The dynamical evolution of a uniform condensate is studied in a further
controlled gaussian approximation, for N=1. Results similar to the large N case
show an internal inconsistency of this approximation. I also study the dynamics
of the system in infinite volume in the broken symmetry phase. The data show
that the fixed points of the evolution cover at most the classically metastable
part of the static effective potential. I finally study the dynamical evolution
for the O(N+1) nonlinear sigma model in 1+1 dimensions in the large N limit. I
first of all verify that the large coupling limit of the O(N+1) phi^4 model,
which renders the model non linear, commutes with the large N limit, so that
the O(infty) nonlinear sigma model is uniquely defined. I then study the
evolution of several observables, like the spectrum of produced particles,
finding no evidence for parametric resonance. I conclude with some remarks on
the ``state of art'' in gauge theories and some comments about the open issues
in the subject.


title:
Note on the Impact Parameter Analysis of High Energy Proton Proton
  Collisions

abstract:
  Following prior analysis for measured pp elastic differential cross section,
the impact parameter representation in terms of profile functions is calculated
from two different parameterizations on single diffractive dissociation data.
The derivative of this quantity with respect to the collision energy squared s
measures the growth rate of the reaction's blackness. Its distribution in
impact parameter space allows detailed insight into the growth pattern of the
total cross section and the approaching unitarity limit. Comparing the results
with the elastic case, the different mechanisms of unitarization of the two
parametrizations are discussed.


title: Chiral Lagrangians at finite density

abstract:
  The effective SU(2) chiral Lagrangian with external sources is given in the
presence of non-vanishing nucleon densities by calculating the in-medium
contributions of the chiral pion-nucleon Lagrangian. As a by product, a
relativistic quantum field theory for Fermi many-particle systems at zero
temperature is directly derived from relativistic quantum field theory with
functional methods.


title: Non-perturbative QCD analysis of near-to-planar three-jet events

abstract:
  We present the analysis of the 1/Q-suppressed non-perturbative (NP)
contribution to the cumulative out-of-event-plane momentum distribution in e+e-
annihilation in the near-to-planar three-jet region. It complements our
previous study of the perturbative (PT) distributions resummed to single
logarithmic accuracy. Due to inter-jet soft gluon radiation, the NP
contributions (as well as the PT distributions) are sensitive to the geometry
(the angles between jets) and the colour structure of the underlying hard
process (topology of the three-prong parton antenna). The results and
techniques presented here could be extended to other multi-jet processes and,
in particular, to hadron-hadron collisions.


title: Quantum corrections for the MSSM Higgs couplings to SM fermions

abstract:
  Higgs Yukawa couplings to down-type fermions receive, in the MSSM,
supersymmetric quantum corrections that can be of order 1 for large values of
tan\beta, provided \mu \sim MSUSY. Therefore, a sensitive prediction for
observables driven by any of these couplings can only be obtained after an
all-order resummation of the large corrections. We perform this necessary step
and show, as an example, the effect of the resummation on the computation of
the p\bar{p},pp \to t\bar{b}H^{-} + X cross-section and on the branching ratio
BR(b\to s\gamma) at the next-to-leading order.


title:
Solar neutrino problem accounting for self-consistent
  magnetohydrodynamics solution for solar magnetic fields

abstract:
  The analysis of the resonant spin-flavour (RSF) solutions to the solar
neutrino problem in the framework of simplest analytic solutions to the solar
magneto-hydrodynamics (MHD) equations is presented. We performed the global fit
of the recent solar neutrino data, including event rates as well as day and
night recoil electron spectra induced by solar neutrino interactions in
SuperKamiokande. We compare quantitatively our simplest MHD-RSF fit with vacuum
oscillation (VAC) and MSW--type (SMA, LMA and LOW) solutions to the solar
neutrino problem using a common well-calibrated theoretical calculation and fit
procedure and find MHD-RSF fit to be somewhat better than those obtained for
the favored neutrino oscillation solutions. We made the predictions for future
experiments to disentangle the MHD-RSF scenario from other scenarios.


title:
Resolving SM-like scenarios via Higgs boson production at a Photon
  Collider: I. 2HDM versus SM

abstract:
  We consider the possibility that after operations at the LHC and e^+e^-
Linear Colliders a Higgs boson will be discovered, but no signal of New Physics
will be found (Standard-Model-like scenario). This can occur in the Standard
Model (SM) as well as in other models, including the Two-Higgs-Doublet Model
(2HDM), the MSSM, etc. Experiments at a Photon Collider can resolve these
cases.
  In this paper we compare the SM and the 2HDM~(II). In the analysis we use as
independent quantities the ratios, to the SM values, of couplings of the
observed Higgs boson to gauge bosons, and to up and down-type quarks (basic
couplings). We derive a relation between these ratios within the 2HDM~(II), a
pattern relation. With the aid of this relation, different possible
realizations of an SM-like scenario are found. For these realizations, we
calculate the loop couplings of the Higgs boson with \gamma\gamma and Z \gamma,
and also with gluons, taking into account the expected accuracy in the
measurements of the basic couplings. The obtained deviation of the two-photon
width from its SM value is generally higher than the expected inaccuracy in the
measurement of \Gamma_{\gamma \gamma} at a Photon Collider. The result is
sensitive to the parameters of the Higgs self interaction.


title: Around SuSy 1970

abstract:
  This is the talk given at the Symposium "Thirty Years of Supersymmetry",
October 13-15, 2000, Theoretical Physics Institute, University of Minnesota.
The history of construction of the first supersymmetric field theory in four
dimensions (1970) is reviewed. In Appendix a verbatim translation of my paper
published in 1971 in Russian (preprint FIAN-41) is presented. In this paper
what is now known as chiral and vector supermultiplets were algebraically
constructed.


title: Relic Dark energy from Trans-Planckian Regime

abstract:
  As yet, there is no underlying fundamental theory for the transplanckian
regime. There is a need to address the issue of how the observables in our
present universe are affected by processes that may have occured during the
transplanckian regime. A particular feature of the family of dispersion
functions chosen is the production of ultralow frequencies at very high momenta
$k> M_P$. We name the range of the ultralow energy modes (of very short
distances) that have frequencies equal or less than the current Hubble rate
$H_0$ as the $\it{tail}$ modes. These modes are still frozen today due to the
expansion of the universe. We calculate their energy today and show that the
$tail$ provides a strong candidate for the {\it dark energy} of the universe.
During inflation, their energy is about 122-123 orders of magnitude smaller
than the total energy. We present the exact solutions and show that: the CMBR
spectrum is that of a (nearly) black body, and that the adiabatic vacuum is the
only choice for the initial conditions. Finally, some of these results can also
be applied to black hole physics.


title: Chiral Symmetry and the Intrinsic Structure of the Nucleon

abstract:
  Understanding hadron structure within the framework of QCD is an extremely
challenging problem. In order to solve it, it is vital that our thinking should
be guided by the best available insight. Our purpose here is to explain the
model independent consequences of the approximate chiral symmetry of QCD for
two famous results concerning the structure of the nucleon. We show that both
the apparent success of the constituent quark model in reproducing the ratio of
the proton to neutron magnetic moments and the apparent success of the Foldy
term in reproducing the observed charge radius of the neutron are coincidental.
That is, a relatively small change of the current quark mass would spoil both
results.


title: Theory of eps'/eps

abstract:
  I shortly review the present status of the theoretical estimates of eps'/eps.
I consider a few aspects of the theoretical calculations which may be relevant
in understanding the present experimental results. I discuss the role of higher
order chiral corrections and in general of non-factorizable contributions for
the explanation of the Delta I = 1/2 selection rule in kaon decays and
eps'/eps. Lacking reliable lattice calculations, the 1/N expansion and
phenomenological approaches may help in understanding correlations among
theoretical effects and the experimental data. The same dynamics which
underlies the CP conserving selection rule appears to drive eps'/eps in the
range of the recent experimental measurements.


title: Leading electroweak logarithms at one loop

abstract:
  We summarize results for the complete one-loop electroweak logarithmic
corrections for general processes at high energies and fixed angles. Our
results are applicable to arbitrary matrix elements that are not
mass-suppressed. We give explicit results for W-boson-pair production in e^+e^-
annihilation.


title:
Photon-3-Pion And Pion-2-Photon Form Factors From Dynamical Constituent
  Quarks

abstract:
  We study the form factors of the low energy anomalous pion-2-photon and
photon-3-pion processes in the nonlocal chiral quark model which incorporates
the momentum dependence of the dynamical quark mass and realizes correctly the
chiral symmetries. The obtained slope parameter for pion-2-photon is in
reasonable agreement with the direct experimental results but smaller than the
ones invoking vector meson dominance. Our result for the photon-3-pion form
factor interpolates between the two extremes of theoretical approaches, with
the largest one provided by the vector meson dominance and the smallest one by
the Schwinger-Dyson approach. But all of them are well below the single data
point available so far. This situation will hopefully be clarified by the
experiments at CEBAF and CERN.


title: Nonfactorizable contributions to the decay mode D^0 -> K^0 \bar{K^0}

abstract:
  We point out that the decay mode D^0 -> K^0 \bar{K^0} has no factorizable
contribution. In the chiral perturbation language, treating D^0 as heavy, the
O(p) contribution is zero. We calculate the nonfactorizable chiral loop
contributions of order O(p^3). Then, we use a heavy-light type chiral quark
model to calculate nonfactorizable tree level terms, also of order O(p^3),
proportional to the gluon condensate. We find that both the chiral loops and
the gluon condensate contributions are of the same order of magnitude as the
experimental amplitude.


title:
Fermion propagator in out of equilibrium quantum-field system and the
  Boltzmann equation

abstract:
  We aim to construct from first principles a perturbative framework for
studying nonequilibrium quantum-field systems that include massless Dirac
fermions. The system of our concern is quasiuniform system near equilibrium or
nonequilibrium quasistationary system. We employ the closed-time-path formalism
and use the so-called gradient approximation. Essentially no further
approximation is introduced. We construct a fermion propagator, with which a
well-defined perturbative framework is formulated. In the course of
construction of the framework, we obtain the generalized Boltzmann equation
(GBE) that describes the evolution of the number-density functions of
(anti)fermionic quasiparticles.


title: Dark Matter and the SUSY Mass Scale

abstract:
  The connection between the present density of neutralinos that are left over
from the Big Bang and the superparticle mass scale is briefly reviewed.
Superparticle mass scales in the range from a few GeV to several TeV can lead
to an acceptable density of thermal relic neutralinos, the actual value
depending on relations between the masses of certain sparticles and Higgs
bosons.


title: Intermittency and Correlations at LEP and at HERA

abstract:
  A review on recent investigations of local fluctuations and genuine
correlations in electron-positron annihilations at LEP and in positron-proton
collisions at HERA is given.


title: Lattice measurement of the energy-gap in a spontaneously broken phase

abstract:
  Using lattice simulations of a one-component $(\lambda \Phi^4)_4$ theory, we
have measured the energy spectrum $\omega({\mathbf{k}})$ in the broken phase at
various lattice sizes. Our data show that the energy-gap $\omega(0)$ is {\it
not} the `Higgs mass' $M_h$ but an infrared-sensitive quantity that becomes
smaller and smaller by increasing the lattice size and may even vanish in the
infinite-volume limit.


title: The sound velocity in an equilibrium hadron gas

abstract:
  We calculate the velocity of sound in an ideal gas of massive hadrons with
non-vanishing baryon number. The gas is in thermal and chemical equilibrium.
Also we show that the temperature dependence $T(\tau) \cong T_{0} \cdot
({\tau_{0} \over \tau})^{c_{s}^{2}}$ is approximately valid, when the gas
expands longitudinally according to the Bjorken law.


title:
A Unified Model of Exclusive $\rho^0$, $\phi$ and $\jpsi$
  Electroproduction

abstract:
  A two-component model is developed for diffractive electroproduction of
$\rho^0$, $\phi$ and $\jpsi$, based on non-perturbative and perturbative
two-gluon exchange. This provides a common kinematical structure for
non-perturbative and perturbative effects, and allows the role of the
vector-meson vertex functions to be explored independently of the production
dynamics. A good global description of the vector-meson data is obtained.


title: Alternative Scenarios for the Fragmentation of a Gluonic Lund String

abstract:
  The assumptions in the Lund model suffice to prescribe a unique stochastic
process for the fragmentation of a string into a set of hadrons, so long as the
string is "flat", ie as long as the state described by the string consists only
of a quark and an antiquark stretching a constant force field between them.
Emission of gluons causes the string to trace more complicated surfaces in
Minkowski space, and some form of generalization of the 1+1 dimensional model
is required. One such generalizaiotn has been developed and implemented as a
Monte Carlo routine "JETSET" by Torbj\"orn Sj\"ostrand, which has been hightly
successful in describing experimental data. But there are theoretical reasons
to believe that the fragmentation scheme employed in JETSET is not entirely
satisfactory; most notably, non-adherance to the Lund Area law, and certain
problems in handling transverse momenta. A few alternative scenarios, which we
have examined in detail and implemented in separate computer programs, will be
presented here, with comparisons to JETSET in certain simple cases. Our effort
has been to preserve the area law for the fragmentation of a gluonic string,
while we explored the possibility of allowing the fragmentation process to
reshape the string surface slightly.


title: Higgs Bosons and the Indirect Search for WIMPs

abstract:
  We investigated the contribution of the MSSM Higgs bosons produced in the
neutralino annihilation in the Earth and Sun to the total WIMPs detection
signals. We found that this contribution is very important and results in a
lower bound for the muon flux from the Sun of 10^{-7} - 10^{-8} m^{-2} yr^{-1}
for neutralinos heavier than 200 GeV. We noticed that due to the SUSY charged
Higgs bosons one can expect an energetic tau neutrino flux from the Sun at a
level of 10^2 m^{-2} yr^{-1}.


title: The Spin Structure of the Nucleon

abstract:
  We present an overview of recent experimental and theoretical advances in our
understanding of the spin structure of protons and neutrons.


title: Generalized Parton Distributions

abstract:
  Applications of perturbative QCD to deeply virtual Compton scattering and
hard exclusive electroproduction processes require a generalization of the
usual parton distributions for the case when long-distance information is
accumulated in nondiagonal matrix elements of quark and gluon light-cone
operators. I describe two types of nonperturbative functions parametrizing such
matrix elements: double distributions and skewed parton distributions. I
discuss their general properties, relation to the usual parton densities and
form factors, evolution equations for both types of generalized parton
distributions (GPD), models for GPDs and their applications in virtual and real
Compton scattering.


title:
Resumming the Light Hemisphere Mass and Narrow Jet Broadening
  distributions in e^+e^- annihilation

abstract:
  We present predictions of two event shape distributions, the light hemisphere
mass and the narrow jet broadening, to next-to-leading logarithmic order. We
apply the coherent branching formalism to resum the leading O(alphas^n
L^{2n-1}) and next-to-leading O(alphas^n L^{2n-2}) infrared logarithms to all
orders in the coupling constant. We include the recently calculated
non-logarithmic next-to-leading order contributions. Applying simple power
corrections to the resummed result gives good agreement with the available data
from LEP.


title: Introduction to QCD Sum Rule Approach

abstract:
  In these lectures, I describe the techniques used within the QCD sum rule
approach. The basic concepts of the approach are introduced using a simple
model of quantum-mechanical oscillator in 2+1 dimensions. Then I discuss their
field-theoretical extension and the construction of the operator product
expansion for current correlators in QCD. The calculation of static parameters
is illustrated on the example of sum rules in the vector and axial meson
channels. Finally, the QCD sum rule calculation of the pion electromagnetic
form factor is presented as an example of application of the method to dynamic
characteristics of the hadrons.


title: Radiative corrections to the Casimir force and effective field theories

abstract:
  Radiative corrections to the Casimir force between two parallel plates are
considered in both scalar field theory of one massless and one massive field
and in QED. Full calculations are contrasted with calculations based on
employing ``boundary-free'' effective field theories. The difference between
two previous results on QED radiative corrections to the Casimir force between
two parallel plates is clarified and the low-energy effective field theory for
the Casimir effect in QED is constructed.


title: Potential of Photon Collider in resolving SM-like scenarios

abstract:
  After operations at the LHC and e^+e^- Linear Colliders it may be found that
a Standard-Model-like scenario is realized. In this scenario no new particle
will be discovered, except a single Higgs boson having partial widths or
coupling constants squared with fundamental particles close, within anticipated
experimental uncertainty, to those of the SM. Experiments at a Photon Collider
can resolve whether the SM model or e.g. the Two Higgs Doublet Model is
realized in Nature.
  For the SM-like version of the 2HDM (II) we study the loop couplings of the
Higgs boson with \gamma\gamma and Z \gamma, and also with gluons. The deviation
of the two-photon width from its SM value is generally higher than the expected
inaccuracy in the measurement of \Gamma_{\gamma \gamma} at a Photon Collider.
The result is sensitive to the parameters of the Higgs self interaction.


title: Electroweak baryogenesis and the Higgs and stop masses

abstract:
  In this talk we review the actual situation concerning electroweak phase
transition and baryogenesis in the minimal supersymmetric extension of the
Standard Model. A strong enough phase transition requires light Higgs and stop
eigenstates. For a Higgs mass in the range 110--115 GeV, there is a stop window
in the range 105--165 GeV. If the Higgs is heavier than 115 GeV, stronger
constrains are imposed on the space of supersymmetric parameters. A
baryon-to-entropy ratio is generated by the chargino sector provided that the
$\mu$ parameter has a CP-violating phase larger than $\sim$ 0.04.


title: The Three Neutrino Scenario

abstract:
  I have discussed in my talk several remaining issues in the standard
three-flavor mixing scheme of neutrinos, in particilar, the sign of $\Delta
m^2_{13}$ and the leptonic CP violating phase. In this report I focus on two
topics: (1) supernova method for determining the former sign, and (2)
illuminating how one can detect the signatures for both of them in
long-baseline ($\gsim 10$ km) neutrino oscillation experiments. I do this by
formulating perturbative frameworks appropriate for the two typical options of
such experiments, the high energy and the low energy options with beam energies
of $\sim$ 10 GeV and $\sim$ 100 MeV, respectively.


title:
CompHEP-PYTHIA interface: integrated package for the collision events
  generation based on exact matrix elements

abstract:
  CompHEP, as a partonic event generator, and PYTHIA, as a generator of final
states of detectable objects, are interfaced. Thus, integrated tool is proposed
for simulation of (almost) arbitrary collision processes at the level of
detectable particles. Exact (multiparticle) matrix elements, convolution with
structure functions, decays, partons hadronization and (optionally) parton
shower evolution are basic stages of calculations. The PEVLIB library of event
generators for LHC processes is described.


title: Suppression of multi-gluon fluctuations in jets at a Linear Collider

abstract:
  It was shown that at typical energies and luminosities of an $e^+e^-$ linear
collider one can observe a significant suppression of fluctuations of the
number of gluons in small angular regions. This property of jets is expected in
$e^+e^-$ annihilation as well as in any collision producing high energy quarks
which give rise to the QCD gluon cascade. The reduction of multiplicity
fluctuations was obtained from perturbative QCD using bunching parameters and
then cross checked with a Monte Carlo simulation. The parton-level Monte Carlo
simulation confirms the prediction, while the hadron level illustrates that the
effect survives the hadronization process.


title: Measuring the Higgs CP property at a Photon Linear Collider

abstract:
  We study measurement of the CP property of the Higgs boson at a photon linear
collider. One method where we take advantage of interference between
Higgs-production and background amplitudes is proposed. A broad peak of the
photon energy spectrum is helpful in observing the energy dependence of the
interference effects. Numerical results for the process $\gamma \gamma \to t
\bar{t}$ are shown as an example.


title:
The Drell-Levy-Yan Relation: ep vs $e^+e^-$ Scattering to
  $O(\alpha_s^2)$

abstract:
  We study the validity of a relation by Drell, Levy and Yan (DLY) connecting
the deep inelastic structure (DIS) functions and the single-particle
fragmentation functions in $e^+e^-$ annihilation which are defined in the
spacelike ($q^2<0$) and timelike ($q^2>0$) regions, with respect to physical
evolution kernels for the two processes to $O(\alpha_s^2)$. We also comment on
a relation proposed by Gribov and Lipatov.


title: Toward Determination of m_t at 50 MeV Accuracy

abstract:
  The top quark mass will be determined to high accuracy from the shape of the
ttbar total production cross section in the threshold region at a future linear
e+e- collider. Presently the estimated statistical error in the measurement of
the MSbar mass of the top quark is \sim 50 MeV, while the estimated theoretical
error is 150-200 MeV. In order to reduce the theoretical uncertainty to below
50 MeV, we have recently computed an important part of the higher-order
corrections. We deomonstrate the significance of the calculated correction.


title:
General one-loop renormalization group evolutions and electroweak
  symmetry breaking in the (M+1)SSM

abstract:
  We study analytically the general features of electroweak symmetry breaking
in the context of the Minimal Supersymmetric Standard Model extended by one
Higgs singlet. The exact analytical forms of the renormalization group
evolutions of the Yukawa couplings and of the soft supersymmetry breaking
parameters are derived to one-loop order. They allow on one hand controllable
approximations in closed analytical form, and on the other a precise study of
the behaviour of infrared quasi fixed point regimes which we carry out. Some of
these regimes are shown to be phenomenologically inconsistent, leading to too
small an effective $\mu$-parameter. The remaining ones serve as a suitable
benchmark to understand analytically some salient aspects, often noticed
numerically in the literature, in relation to the electroweak symmetry breaking
in this model. The study does not need any specific assumption on $\tan \beta$
or on boundary conditions for the soft supersymmetry breaking parameters, thus
allowing a general insight into the sensitivity of the low energy physics to
high energy assumptions.


title:
Coulomb-hadron phase factor and spin phenomena in a wide region of
  transfer momenta

abstract:
  The Coulomb-hadron interference effects are examined at small and large $t$.
The methods for the definition of spin-dependent parts of hadron scattering
amplitude are presented. The additional contributions to analyzing power $A_N$
and the double spin correlation parameter $A_{NN}$ owing to the
electromagnetic-hadron interference are determined in the diffraction dip
domain of high-energy elastic hadron scattering.


title: Study of e+e- -> H+H- at a 800 GeV Linear Collider

abstract:
  The production and decay of heavy charged Higgs bosons at a 800 GeV e+e-
linear collider have been studied. The analysis of the H+H- -> tb tb, expected
to be dominant in the MSSM, and H+H- -> W+h0 W-h0 decay modes leading to the
same final state consisting of two W bosons and four b quarks, provides with a
determination of the boson mass to 1 GeV and of the production cross section
with 10% accuracy for 500 fb-1 of data.


title:
Relativistic corrections to the electromagnetic polarizabilities of
  compound systems

abstract:
  The low-energy amplitude of Compton scattering on the bound state of two
charged particles of arbitrary masses, charges and spins is calculated. A case
in which the bound state exists due to electromagnetic interaction (QED) is
considered. The term, proportional to $\omega^2$, is obtained taking into
account the first relativistic correction. It is shown that the complete result
for this correction differs essentially from the commonly used term
$\Delta\alpha$, proportional to the r.m.s. charge radius of the system. We
propose that the same situation can take place in the more complicated case of
hadrons.


title: A gap-less mode of the singlet Higgs field

abstract:
  Recent lattice results suggest the existence of a gap-less mode of the
singlet Higgs field. We present a description of spontaneous symmetry breaking
in $\lambda\Phi^4$ theories showing why one is faced with long-wavelength,
collective modes of the scalar condensate with $\tilde{E}({\bf{p}}) \to 0$
energy in the ${\bf{p}} \to 0$ limit.


title:
Some Phenomenological Aspects of the (n + m + 1) dimensional Brane World
  Scenario with an m-form Field

abstract:
  In the D = (n + m + 1) dimensional brane world scenario with m compact
dimensions, the radion modulus can be stabilised by a massive bulk m-form
antisymmetric field. We analyse some of the phenomenological aspects of this
scenario. We find that the radion mass is smaller than the TeV scale, but
larger than that in the case where the radion modulus is stabilised by a bulk
scalar field. From the macroscopic n dimensional spacetime point of view, the
m-form field mimics a set of p-form fields. We analyse the mass spectrum of
these fields. The lowest mass is \stackrel{>}{_\sim} TeV whereas, for any bulk
or brane field, the excitations in the compact space have Planckian mass and
are likely to reintroduce the hierarchy problem. Also, we analyse the couplings
of the m-form field to the matter fields living on a brane. The present results
are applicable to more general cases also.


title: Correlations in e+e- --> W+W- hadronic decays

abstract:
  A mathematical formalism for the analysis of correlations in multi-source
events such as $W^+W^-$ production in $e^+e^-$ annihilations is presented.
Various measures used in experimental searches for inter-$W$ correlations are
reviewed.


title: Neutrino Oscillation Workshop 2000: Conference Summary

abstract:
  The NOW2000 Workshop summarized the present status and future possibilities
for all aspects of neutrino physics and astrophysics. Neutrino oscillation
physics has truly come of age in the last few years. It is now data driven
(analogous to cosmology and much of high energy physics in general).
Experimental techniques and the theoretical interpretation have developed
dramatically. An example of the latter includes the more realistic analysis of
neutrino oscillations in the framework of 3 or more mass eigenstates. The
phenomenological emphasis has shifted from degenerate to hierarchical neutrino
spectra.


title: Vector mesons in Quasilocal Quark Models

abstract:
  We consider the Quasilocal Quark Model of NJL type including vector and
axial-vector four-fermion interaction with derivatives. In the presence of a
strong attraction in the scalar channel the chiral symmetry is spontaneously
broken and as a consequence the composite meson states are generated in the
vector and axial-vector channels. The appropriate set of Chiral Symmetry
Restoration Sum Rules in these channels are imposed as matching rules to QCD at
intermediate energies. The mass spectrum and some decay constants for ground
and excited meson states are calculated.


title: Coherent Exclusive Exponentiation of 2f Processes in e+e- Annihilation

abstract:
  In the talk we present the Coherent Exclusive Exponentiation (CEEX) which is
implemented in the KK MC event generator for the process e+e- to f bar f +n
gamma, f=mu,tau,d,u,s,c,b for center of mass energies from tau lepton threshold
to 1TeV, that is for LEP1, LEP2, SLC, future Linear Colliders,
b,c,tau-factories etc. We will attempt a short discussion of the theoretical
concepts necessary in our approach, in particular the relations between the
rigorous calculation of spin amplitudes (perturbation expansion), phase space
parametrisation and exponentiation. In CEEX effects due to photon emission from
the initial beams and outgoing fermions are calculated in QED up to
second-order, including all interference effects. Electroweak corrections are
included in first-order, at the amplitude level. The beams can be polarised
longitudinally and transversely, and all spin correlations are incorporated in
an exact manner. Precision predictions, in particular the photon emission at
LEP2 energies, are also shown.


title:
The pionic width of the $\omega(782)$ meson within a well-defined,
  unitary quantum field theory of (anti-)particles and (anti-)holes

abstract:
  We investigate the indirect generation of the partial width of the
$\omega(782)$ meson with respect to the reaction $\omega(782) \to \rho(770) \pi
\to\pi^+\pi^-\pi^0$ within the context of a ``Unitary Effective Resonance
Model'' (UERM), which has previously been applied to resonant fermionic field
operators, here extended to scalar, pseudoscalar and vector bosonic fields. The
$\omega(782)$ meson is described by a (quasi-)real field, while the
intermediate $\rho(770)$ meson is considered to be a resonant degree of
freedom, which can be treated consistently within the UERM.
  In the limit of an infinitesimal width (imaginary part of self-energy), the
UERM yields a consistent treatment of relativistic quantum field theory (QFT).
Some aspects of the UERM of (anti-)particles and (anti-)holes are discussed.

categories: hep-ph astro-ph cond-mat.mtrl-sci nucl-th quant-ph


title: Conformal Expansions: A Template for QCD Predictions

abstract:
  The use of conformal expansions for predictions in quantum chromodynamics is
discussed as a way to avoid renormalization scheme and scale ambiguities, as
well as factorial growth of perturbative coefficients due to renormalons.
Special emphasis is given to the properties of an assumed skeleton expansion
and its relation to the Banks-Zaks expansion. The relation of BLM scale-setting
to the skeleton expansion is also discussed and new criteria for the
applicability of BLM scale-setting are presented.


title: Bubble Walls, CP Violation and Electroweak Baryogenesis in the MSSM

abstract:
  We discuss the generation of the baryon asymmetry by a strong first order
electroweak phase transition in the early universe, particularly in the context
of the MSSM. This requires a thorough numerical treatment of the bubble wall
profile in the case of two Higgs fields. CP violating complex particle masses
varying with the Higgs field in the wall are essential. Since in the MSSM there
is no indication of spontaneous CP violation around the critical temperature
(contrary to the NMSSM) we have to rely on standard explicit CP violation.
Using the WKB approximation for particles in the plasma we are led to Boltzmann
transport equations for the difference of left-handed particles and their CP
conjugates. This asymmetry is finally transformed into a baryon asymmetry by
out of equilibrium sphaleron transitions in the symmetric phase. We solve the
transport equations and find a baryon asymmetry depending mostly on the CP
violating phases and the wall velocity.


title: Lepton-Flavor Violation with Non-universal Soft Terms

abstract:
  We study the lepton-flavor violation processes tau ->mu gamma and mu->e gamma
in two different examples of models with non-universal soft breaking terms
derived from strings. We show that the predictions are quite different from
those of universal scenarios. Non-universal A-terms provide an interesting
framework to enhance the supersymmetric contributions to CP violation effects.
We observe that in the case of the lepton-flavor violation we study, the
non-universality of the scalar masses enhances the branching ratios more
significantly than the non-universality of the A-terms. We find that the
current experimental bounds on these processes restrict both the parameter
space of the models and the texture of the Yukawa couplings which predicts the
lepton masses, providing at the same time an interesting experimental test for
physics beyond the Standard Model.


title:
Direct photons: a nonequilibrium signal of the expanding quark-gluon
  plasma

abstract:
  Direct photon production from a longitudinally expanding quark-gluon plasma
(QGP) at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC)
energies is studied with a real-time kinetic description that is consistently
incorporated with hydrodynamics. Within Bjorken's hydrodynamical model, energy
nonconserving (anti)quark bremsstrahlung q(\bar{q})\to q(\bar{q})\gamma and
quark-antiquark annihilation q\bar{q}\to \gamma are shown to be the dominant
nonequilibrium effects during the transient lifetime of the QGP. For central
collisions we find a significant excess of direct photons in the range of
transverse momentum 1-2 \lesssim p_T \lesssim 5 GeV/c as compared to
equilibrium results. The photon rapidity distribution exhibits a central
plateau. The transverse momentum distribution at midrapidity falls off with a
{\em power law} p^{-\nu}_T with 2.5 \lesssim \nu \lesssim 3 as a consequence of
these energy nonconserving processes, providing a distinct experimental {\em
nonequilibrium signature}. The power law exponent \nu increases with the
initial temperature of the QGP and hence with the total multiplicity rapidity
distribution dN_\pi/dy.


title: Spacetime Fluctuations and the Cosmological Constant Problem

abstract:
  Spacetime geometry is treated as a fluctuating, stochastic quantum system
allowing an effective quantum gravity solution to the cosmological constant
problem. A Focker-Planck equation for the probability density of spacetime
metric fluctuations is solved for an FRW universe and the most probable value
for the metric scale factor R is for a very small cosmological constant.