title: Soft hadron production in pp interactions up to ISR energies

abstract:
  Soft hadron production is described as a two-step process, where the
interaction of the partonic constituents of the colliding hadrons leads to the
production of intermediate subsystems (fireballs), which decay subsequently
into hadrons. The weights of the various final states are derived from the
corresponding phase-space factors modified by empirical transition elements.
The results compare well with data at energies between particle production
thresholds and ISR energies. Special emphasis is put on correlation data, which
offer the opportunity to shed some light on the question whether particle
production proceeds via fireballs or strings.


title: Solving the Solar and Atmospheric Neutrino Problems with Supersymmetry

abstract:
  The simplest unified extension of the Minimal Supersymmetric Standard Model
with bi-linear R--Parity violation provides a predictive scheme for neutrino
masses which can account for the observed atmospheric and solar neutrino
anomalies. Despite the smallness of neutrino masses R-parity violation is
observable at present and future high-energy colliders, providing an
unambiguous cross-check of the model.


title: A geometrical estimation of saturation of partonic densities

abstract:
  We propose a new criterium for saturation of the density of partons both in
nucleons and nuclei. It is applicable to any multiple scattering model which
would be used to compute the number of strings exchanged in $ep$ and $eA$
collisions. The criterium is based on percolation of strings, and the onset of
percolation is estimated from expectations coming from the study of heavy ion
collisions at high energies. We interpret this onset as an indication of
saturation of the density of partons in the wave function of the hadron. In
order to produce quantitative results, a particular model fitted to describe
present HERA data and generalized to the nuclear case is used. Nevertheless,
with the number of scatterings controlled by the relation between inclusive and
diffractive processes, conclusions are weakly model-dependent as long as
different models are tuned to describe the experimental data. This constitutes
a new approach, based on the eikonal description of soft hadronic collisions,
and different from others which employ either perturbative QCD ideas or
semiclassical methods. It offers an alternative picture for saturation in the
small $Q^2$ region.


title: News about nu's

abstract:
  We review new results in neutrino physics, including the latest data of the
Super-Kamiokande, SNO and K2K experiments.


title:
The Specific Heat of Normal, Degenerate Quark Matter: Non-Fermi Liquid
  Corrections

abstract:
  In normal degenerate quark matter, the exchange of dynamically screened
transverse gluons introduces infrared divergences in the quark self-energies
that lead to the breakdown of the Fermi liquid description. If the core of
neutron stars are composed of quark matter with a normal component, cooling by
direct quark Urca processes may be modified by non-Fermi liquid corrections. We
find that while the quasiparticle density of states is finite and non-zero at
the Fermi surface, its frequency derivative diverges and results in non-Fermi
liquid corrections to the specific heat of the normal, degenerate component of
quark matter. We study these non-perturbative non-Fermi liquid corrections to
the specific heat and the temperature dependence of the chemical potential and
show that these lead to a reduction of the specific heat.


title: CP Violation in B Decays

abstract:
  The role of B decays in the study of CP violation is reviewed. We treat the
interactions and spectroscopy of the $b$ quark and then introduce CP violation
in $B$ meson decays, including time-dependences, decays to CP eigenstates and
non-eigenstates, and flavor tagging. Additional topics include studies of
strange $B$'s, decays to pairs of light pseudoscalar mesons, and the roles of
gluonic and electroweak penguin diagrams, and final-state interactions.


title:
Focus Point Supersymmetry: Proton Decay, Flavor and CP Violation, and
  the Higgs Boson Mass

abstract:
  In focus point supersymmetry, all squarks and sleptons, including those of
the third generation, have multi-TeV masses without sacrificing naturalness. We
examine the implications of this framework for low energy constraints and the
light Higgs boson mass. Undesirable contributions to proton decay and electric
dipole moments, generic in many supersymmetric models, are strongly suppressed.
As a result, the prediction for alpha_s in simple grand unified theories is 3
to 5 standard deviations closer to the experimental value, and the allowed
CP-violating phases are larger by one to two orders of magnitude. In addition,
the very heavy top and bottom squarks of focus point supersymmetry naturally
produce a Higgs boson mass at or above 115 GeV without requiring heavy
gauginos. We conclude with an extended discussion of issues related to the
definition of naturalness and comment on several other prescriptions given in
the literature.


title: Phenomenology of Higgs bosons in the Zee-Model

abstract:
  To generate small neutrino masses radiatively, the Zee-model introduces two
Higgs doublets and one weak-singlet charged Higgs boson to its Higgs sector.
  From analyzing the renormalization group equations, we determine the
possibile range of the lightest CP-even Higgs boson ($h$) mass and the Higgs
boson self-couplings as a function of the cut-off scale beyond which either
some of the coupling constants are strong enough to invalidate the perturbative
analysis or the stability of the electroweak vacuum is no longer guaranteed.
Using the results obtained from the above analysis, we find that the singlet
charged Higgs boson can significantly modify the partial decay width of $h \to
\gamma \gamma$ via radiative corrections, and its collider phenomenology can
also be drastically different from that of the charged Higgs bosons in the
usual two-Higgs-doublet models.


title: Non-factorizable contributions in B decays revisited

abstract:
  Two-body decays of B mesons are studied by decomposing their amplitude into a
sum of factorizable and non-factorizable ones. The former is estimated by using
the naive factorization while the latter is calculated by using a hard pion (or
kaon) approximation in the infinite momentum frame. It is seen that the
non-factorizable contribution is small but not negligible in color favored
decays while it is more important in color mismatched decays.


title:
Direct Detection of Neutralino Dark Matter and the Anomalous Dipole
  Moment of the Muon

abstract:
  We compare predictions for the spin-independent contribution to the
neutralino-proton scattering cross section $\sig$ and for the anomalous
magnetic dipole moment of the muon, $a_\mu = (g_\mu-2)/2$, in models with
gravity-mediated supersymmetry breaking. We nearly always find a positive
correlation between these two measurables, i.e. scenarios with larger $a_\mu$
also tend to have larger $\sig$, but the detailed prediction differs greatly
between models. In particular, we find that for the popular mSUGRA scenario
with universal soft breaking masses at the scale of Grand Unification,
measurements of $a_\mu$ currently seem more promising. On the other hand, if
scalar soft breaking masses at the GUT scale receive sizable contributions from
SO(10) D-terms, one often finds scenarios with large $\sig$ but $a_\mu$ below
the currently foreseen sensitivity. A string-inspired model with non-universal
scalar spectrum at the GUT scale falls between these two cases.


title: Higgs, SUSY and the Standard Model at $\gamma\gamma$ Colliders

abstract:
  In this report I surveyed physics potential of the gamma-gamma option of a
Linear e+e- Collider with the following questions in mind: What new discovery
can be expected at a gamma-gamma collider in addition to what will be learned
at its `parent' e+e- Linear Collider? By taking account of the hard energy
spectrum and polarization of colliding photons, produced by Compton
back-scattering of laser light off incoming e- beams, we find that a
gamma-gamma collider is most powerful when new physics appears in the neutral
spin-zero channel at an invariant mass below about 80% of the c.m. energy of
the colliding e-e- system. If a light Higgs boson exists, its properties can be
studied in detail, and if its heavier partners or a heavy Higgs boson exists in
the above mass range, they may be discovered at a gamma-gamma collider. CP
property of the scalar sector can be explored in detail by making use of linear
polarization of the colliding photons, decay angular correlations of final
state particles, and the pattern of interference with the Standard model
amplitudes. A few comments are given for SUSY particle studies at a gamma-gamma
collider, where a pair of charged spinless particles is produced in the s-wave
near the threshold. Squark-onium may be discovered. An e^\pm gamma collision
mode may measure the Higgs-Z-gamma coupling accurately and probe flavor
oscillations in the slepton sector. As a general remark, all the Standard Model
background simulation tools should be prepared in the helicity amplitude level,
so that simulation can be performed for an arbitrary set of Stokes parameters
of the incoming photon beams.


title:
Spin effects in the fragmentation of transversely polarized and
  unpolarized quarks

abstract:
  We study the fragmentation of a transversely polarized quark into a non
collinear (k_T not= 0) spinless hadron and the fragmentation of an unpolarized
quark into a non collinear transversely polarized spin 1/2 baryon. These
nonperturbative properties are described by spin and k_T dependent
fragmentation functions and are revealed in the observation of single spin
asymmetries. Recent data on the production of pions in polarized semi-inclusive
DIS and long known data on Lambda polarization in unpolarized p-N processes are
considered: these new fragmentation functions can describe the experimental
results and the single spin effects in the quark fragmentation turn out to be
surprisingly large.


title: Properties of color singlet chain states in $e^+e^-$ annihilation

abstract:
  We use the method of the color effective Hamiltonian to study the structure
of color singlet chain states in $N_c=3$ and in the large $N_c$ limit. In order
to obtain their total fraction when $N_c$ is finite, we illustrate how to
orthogonalize these non-orthogonal states. We give numerical results for the
fraction of orthogonalized states in $e^+e^-\to q\bar{q}gg$. With the help of a
diagram technique, we derive their fraction up to $O(1/N_c^2)$ for the general
multigluon process. For large $N_c$ the singlet chain states correspond to
well-defined color topologies. Therefore we may expect that the fraction of
non-color-singlet-chain states is an estimate of the fraction of events where
color reconnection is possible. In the case of soft gluon bremsstrahlung, we
give an explicit form for the color effective Hamiltonian which leads to the
dipole cascade formulation for parton showering in leading order in $N_c$. The
next-to-leading order corrections are also given for $e^+e^-\to q\bar{q}g_1g_2$
and $e^+e^-\to q\bar{q}g_1g_2g_3$.


title:
HERWIG 6.5: an event generator for Hadron Emission Reactions With
  Interfering Gluons (including supersymmetric processes)

abstract:
  HERWIG is a general-purpose Monte Carlo event generator, which includes the
simulation of hard lepton-lepton, lepton-hadron and hadron-hadron scattering
and soft hadron-hadron collisions in one package. It uses the parton-shower
approach for initial- and final-state QCD radiation, including colour coherence
effects and azimuthal correlations both within and between jets. This article
updates the description of HERWIG published in 1992, emphasising the new
features incorporated since then. These include, in particular, the matching of
first-order matrix elements with parton showers, a more correct treatment of
heavy quark decays, and a wide range of new processes, including many predicted
by the Minimal Supersymmetric Standard Model, with the option of R-parity
violation. At the same time we offer a brief review of the physics underlying
HERWIG together with details of the input and control parameters and the output
data, to provide a self-contained guide for prospective users of the program.
This version of the manual (version 3) is updated to HERWIG version 6.5, which
is expected to be the last major release of Fortran HERWIG. Future developments
will be implemented in a new C++ event generator, HERWIG++.


title: Three-Body Decays of Top and Bottom Squarks

abstract:
  We investigate the decays of third generation scalar quarks in the Minimal
Supersymmetric extension of the Standard Model, focusing on the three-body
modes. We calculate the partial widths of the decays of heavier top and bottom
squarks into the lighter ones and a fermion pair [through virtual vector boson,
Higgs boson or gaugino exchanges] and the partial widths of the three-body
decays of both top squarks into bottom quarks and a pair of fermion and scalar
fermion [we consider the case of lighter $\tilde{\tau}$ or $\tilde{b}$ states]
and into a bottom quark, the lightest neutralino and a $W$ or a charged Higgs
boson $H^\pm$. Some of these decay modes are shown to have substantial
branching ratios in some areas of the parameter space.


title: QCD at finite isospin density: from pion to quark-antiquark condensation

abstract:
  QCD at finite isospin chemical potential mu_I is studied. This theory has no
fermion sign problem and can be simulated on the lattice using present-day
techniques. We solve this theory analytically in two limits: low mu_I where
chiral perturbation theory is applicable, and asymptotically high mu_I where
perturbative QCD is at work. At low isospin density the ground state is a
superfluid pion condensate. At very high density it is a Fermi liquid with
Cooper pairing. The pairs carry the same quantum numbers as the pions.
Motivated by this observation, we put forward a conjecture that the transition
from hadron to quark matter is smooth. The conjecture passes several nontrivial
tests. Our results imply a nontrivial phase diagram in the space of temperature
and chemical potentials of isospin and baryon number. At asymtotically large
values of mu_I and small values of baryon chemical potential the ground state
is in a phase similar to Fulde-Ferrell-Larkin-Ovchinnikov phase. It is
characterized by a spatially modulated superfluid order parameter
<ubar*gamma_5*d> and may be the asymptotic limit of the inhomogeneous pion
condensation phase advocated by Migdal and others.


title:
Measuring the Higgs Branching Fraction into two Photons at Future Linear
  \ee Colliders

abstract:
  We examine the prospects for measuring the \gaga branching fraction of a
Standard Model-like Higgs boson with a mass of 120 GeV at the future TESLA
linear \ee collider, assuming an integrated luminosity of 1 ab$^{-1}$ and
center-of-mass energies of 350 GeV and 500 GeV. The Higgs boson is produced in
association with a fermion pair via the Higgsstrahlung process \ee $\to ZH$,
with $Z \to$ \qq or \nn, or the WW fusion reaction $e^+e^- \to \nu_e
\bar{\nu_e} H$. A relative uncertainty on BF(\hgg) of~16% can be achieved in
unpolarized \ee collisions at $\sqrt{s}$=~500 GeV, while for $\sqrt{s}$=~350
GeV the expected precision is slightly poorer. With appropriate initial state
polarizations $\Delta$BF(\hgg)/BF(\hgg) can be improved to 10%. If this
measurement is combined with the expected error for the total Higgs width, a
precision of 10% on the \gaga Higgs boson partial width appears feasible.


title: Reconstructing Supersymmetric Theories at the Linear Collider

abstract:
  High precision measurements at the linear collider will allow a model-
independent reconstruction of nature at high energy scales. The method of
bottom-up extrapolation from the electroweak scale to the GUT scale is
explained and both a universal minimal supergravity and a gaugino-mediated
model are presented as examples. Comparisons are made with the LHC-only case.


title: QCD radiative corrections to $\gamma^*\gamma^* \to$ hadrons

abstract:
  We compute the order-$\as$ corrections to the total cross section and to jet
rates for the process $\epem\to\epem +$ hadrons, where the hadrons are produced
through crossed-channel quark exchange in the hard scattering of two off-shell
photons originating from the incoming leptons. We use a next-to-leading order
general-purpose partonic Monte Carlo event generator that allows the
computation of a rate differential in the produced leptons and hadrons. We
compare our results with the available experimental data for $\epem\to\epem +$
hadrons at LEP2.


title: Neutrino Masses in SUSY Models

abstract:
  In this talk we assume the conventional see-saw mechanism, and contruct a
hierarchical pattern of three active neutrinos with bi-maximal mixing. In order
to enforce the hierarchy we use the single right handed neutrino dominance
mechanism which is a very nice way to ensure a neutrino mass hierarchy in the
presence of large mixing angles. We show how this mechanism can be organised in
the framework of a U(1) family symmetry, then discuss a realistic
string-inspired model which includes such a symmetry.


title: On the Radiative Corrections to the Pseudo-scalar Higgs Boson Mass

abstract:
  We reexamine the one-loop corrections to the mass of the pseudo-scalar Higgs
boson, using the effective potential. In the absence of the chargino and
neutralino contributions its mass exhibits a large scale dependence in the
large $M_{1/2}$ regime, especially for values of $\tan \beta>20$. Thus,
although of electroweak origin, the heaviness of the $M_{1/2}$, in conjunction
with the largeness of $\tan \beta$, makes these corrections very important for
establishing a scale independent result and an unambiguous determination of the
pseudo-scalar mass in this region of the parameter space.


title: Renormalization Group Flow Equations For The Scalar O(N) Theory

abstract:
  Self-consistent new renormalization group flow equations for an
O(N)-symmetric scalar theory are approximated in next-to-leading order of the
derivative expansion. The Wilson-Fisher fixed point in three dimensions is
analyzed in detail and various critical exponents are calculated.


title:
Light-Front-Quantized QCD in Light-Cone Gauge: The Doubly Transverse
  Gauge Propagator

abstract:
  The light-front (LF) quantization of QCD in light-cone gauge has a number of
remarkable advantages, including explicit unitarity, a physical Fock expansion,
the absence of ghost degrees of freedom, and the decoupling properties needed
to prove factorization theorems in high momentum transfer inclusive and
exclusive reactions. We present a systematic study of LF-quantized gauge theory
following the Dirac method and construct the Dyson-Wick S-matrix expansion
based on LF-time-ordered products. The free theory gauge field is shown to
satisfy the Lorentz condition as an operator equation as well as the light-cone
gauge condition. Its propagator is found to be transverse with respect to both
its four-momentum and the gauge direction. The interaction Hamiltonian of QCD
can be expressed in a form resembling that of covariant theory, except for
additional instantaneous interactions which can be treated systematically. The
renormalization constants in YM theory are shown to satisfy the identity
$Z_1=Z_3$ at one loop order. The QCD $\beta$ function computed in the
noncovariant light-cone gauge agrees with that known in the conventional
framework. Some comments on the relationship of our LF framework, with the
doubly transverse gauge propagator, to the analytic effective charge and
renormalization scheme defined by the pinch technique, the unitarity relations
and the spectral representation are also made. LF quantization thus provides a
consistent formulation of gauge theory, despite the fact that the hyperplanes
$x^{\pm}=0$ used to impose boundary conditions constitute characteristic
surfaces of a hyperbolic partial differential equation.


title: Three-Loop Leading Top Mass Contributions to the rho Parameter

abstract:
  We present analytical results for the leading contributions of the top quark
to the electroweak rho parameter at order GF^3 Mt^6 and GF^2 Mt^4 alpha_s. The
Higgs boson and the gauge bosons are taken to be massless in this limit. The
correction of order GF^3 Mt^6 is found to be sizeable in comparison to the the
leading two-loop GF^2 Mt^4 correction, however it is much smaller than the
subleading GF^2 Mt^2 MZ^2 correction.


title: Brane Fluctuation and New Counting Rules for Kaluza-Klein Towers

abstract:
  In models with extra dimensions, branes have been usually treated as solid
bodies though they are prohibited by the relativity. In the previous letter, we
proposed a method of taking account of brane fluctuation by introducing
Nambu-Goldstone bosons, and prove that when a tension of the brane is small,
the interaction between boundary fields and Kaluza-Klein modes is suppressed
exponentially. In this letter, we further investigate this suppression in more
generic configuration, and obtain three counting rules, ``AND'', ``OR'' and
``STACK'' rules, depending on the softness of branes and the character of
fields on the branes four dimensions. The choice determines the number of
Kaluza-Klein towers contributing to renormalization group equations, leading to
a remarkable change in the running behavior of coupling constants.


title:
Signals of R-parity violating supersymmetry in neutrino scattering at
  muon storage rings

abstract:
  Neutrino oscillation signals at muon storage rings can be faked by
supersymmetric (SUSY) interactions in an R-parity violating scenario. We
investigate the $\tau$-appearance signals for both long-baseline and near-site
experiments, and conclude that the latter is of great use in distinguishing
between oscillation and SUSY effects. On the other hand, SUSY can cause a
manifold increase in the event rate for wrong-sign muons at a long-baseline
setting, thereby providing us with signatures of new physics.


title: TASI Lectures on The Strong CP Problem

abstract:
  These lectures discuss the $\theta$ parameter of QCD. After an introduction
to anomalies in four and two dimensions, the parameter is introduced. That such
topological parameters can have physical effects is illustrated with two
dimensional models, and then explained in QCD using instantons and current
algebra. Possible solutions including axions, a massless up quark, and
spontaneous CP violation are discussed.


title: Anomalies and WZW-term of two-flavour QCD

abstract:
  The U(2)_R x U(2)_L symmetry of QCD with two massless flavours is subject to
anomalies which affect correlation functions involving the singlet currents
A^0_\mu or V^0_\mu. These are relevant for pion-photon interactions, because -
for two flavours - the electromagnetic current contains a singlet piece. We
give the effective Lagrangian required for the corresponding low energy
analysis to next-to-leading order, without invoking an expansion in the mass of
the strange quark. In particular, the Wess-Zumino-Witten term that accounts for
the two-flavour anomalies within the effective theory is written down in closed
form.


title: Phenomenology of Supersymmetric Theories with and without R-Parity

abstract:
  We review supersymmetry models with and without R-parity. After briefly
describing the Minimal Supersymetric Standard Model and its particle content we
move to models where R-parity is broken, either spontaneously or explicitly. In
this last case we consider the situation where R-parity is broken via bilinear
terms in the superpotential. The radiative breaking of these models is
described in the context of $b$--$\tau$ and $b$--$\tau$--$t$ unification.
Finally we review the phenomenology of these R-parity violating models.


title: Asymptotic deconfinement in high-density QCD

abstract:
  We discuss QCD with two light flavors at large baryon chemical potential mu.
Color superconductivity leads to partial breaking of the color SU(3) group. We
show that the infrared physics is governed by the gluodynamics of the remaining
SU(2) group with an exponentially soft confinement scale Lambda_QCD'
Delta*exp[-a*mu/(g*Delta)], where Delta<<mu is the superconducting gap, g is
the strong coupling, and a=0.81... We estimate that at moderate baryon
densities Lambda_QCD' is O(10 MeV) or smaller. The confinement radius increases
exponentially with density, leading to "asymptotic deconfinement." The velocity
of the SU(2) gluons is small due to the large dielectric constant of the
medium.


title: Fermions from Bosons in a Theta Vacuum

abstract: Withdrawn. Work never submitted.


title: Parton showers beyond the leading order: a factorization approach

abstract:
  We discuss recent work on methods for incorporating nonleading QCD
corrections in parton shower algorithms.


title:
Constraints on ultraviolet-stable fixed points in supersymmetric gauge
  theories

abstract:
  We consider the possibility that some supersymmetric gauge theories which are
not asymptotically free can be governed by ultraviolet-stable fixed points. If
this scenario can be realized, gaugino masses will exhibit power-law running
with scale, providing a possible solution to the supersymmetric flavor problem.
While naive perturbative calculations hint at the appearance of
ultraviolet-stable fixed points in certain theories, there are strong
constraints following from limits on the scaling dimensions of gauge-invariant
operators, positivity of central charges, and Cardy's conjectured constraint on
the flow of the Euler coefficient in the stress tensor trace anomaly. Also, we
prove that if ultraviolet-stable fixed points do exist, they cannot occur in
the perturbative regime of a renormalizable model, and that all-orders results
in the limit of large numbers of chiral superfields are necessarily
inconclusive. However, we argue that the general idea of ultraviolet-stable
fixed points in supersymmetric gauge theories is viable, and exhibit models
that can satisfy all known constraints.


title: Skewed Parton Distributions

abstract:
  Applications of perturbative QCD to deeply virtual Compton scattering and
hard exclusive electroproduction processes require a generalization of usual
parton distributions for the case when long-distance information is accumulated
in nonforward matrix elements of quark and gluon light-cone operators. We
describe two types of nonperturbative functions parametrizing such matrix
elements: double distributions F(x,y;t) and skewed distribution functions
  F_\zeta(X;t), discuss their properties, and basic uses in the QCD description
of hard exclusive processes.


title:
The tensor reduction and master integrals of the two-loop massless
  crossed box

abstract:
  We briefly discuss an algorithm for the tensor reduction of the two-loop
massless crossed boxes, with light-like external legs, and the computation of
the relative master integrals.


title:
Leptogenesis in a Realistic Supersymmetric Model of Inflation with a Low
  Reheat Temperature

abstract:
  We discuss leptogenesis in a realistic supersymmetric model of inflation with
a low reheat temperature 1-10 GeV. The lepton asymmetry is generated by a
decaying right handed sneutrino, which is produced after inflation during
preheating. The inflationary model is based on a simple variant of the
Next-to-Minimal Supersymmetric Standard model (NMSSM) which solves the \mu
problem, called \phiNMSSM, where the additional singlet \phi plays the role of
the inflaton in hybrid (or inverted hybrid) type models. The model is invariant
under an approximate Peccei-Quinn symmetry which also solves the strong CP
problem, and leads to an invisible axion with interesting cosmological
consequences. We show how the baryon number of the universe and the nature of
cold dark matter are determined by the same parameters controlling the strong
CP problem, the \mu problem and the neutrino masses and mixing angles.


title: Neutrino focusing

abstract:
  We study the lensing of neutrinos by astrophysical objects. At the difference
of photons, neutrinos can cross a stellar core; as a result the lens quality
improves. While Uranians alone would benefit from this effect in the Sun,
similar effects could be considered for binary systems.


title:
Ambiguities of theoretical parameters and CP/T violation in neutrino
  factories

abstract:
  We study the sensitivity to the CP/T-violation search in the presence of
ambiguities of the theoretical parameters. Three generations of neutrinos are
considered. The parameters whose ambiguities are considered are the differences
of the squared masses, the mixing angles, and the density of matter.
  We first consider the statistics that are sensitive to the genuine
CP-violation effect originating from the imaginary coupling. No ambiguity of
the parameters is considered in this part. It is argued that the widely-adopted
usual statistics are not necessarily sensitive to the genuine CP-violation
effect. Two statistics that are sensitive to the imaginary coupling are
proposed. The qualitative difference between these statistics and the usual one
are discussed.
  Next we proceed to the case where the ambiguity of the parameters is present.
The sensitivity of the CP-violation search is greatly spoiled when the baseline
length is longer than about one thousand kilometers, which turns out to be due
to the ambiguity of the matter effect. Thus the CP-violation search by use of
CP conjugate channels turns out to require a low energy neutrino and short
baseline length. It is also shown that such a loss of sensitivity is avoided by
using T-conjugate oscillation channels.


title:
Texture Specific Mass Matrices and CP violating asymmetry in B^o_d({\bar
  B}^o_d) -> \psi K_S

abstract:
  In the context of texture 4 - zero and texture 5 - zero hierarchical quark
mass matrices, CP violating asymmetry in $B^o_d({\bar B}^o_d) \to \psi K_S$
(sin2$\beta$) has been evaluated by considering quark masses at $m_Z$ scale.
For a particular viable texture 4 - zero mass matrix the range of sin2\beta is:
0.27 - 0.60 and for the corresponding texture 5 - zero case it is 0.31 - 0.59.
Further our calculations reveal a crucial dependence of sin2$\beta$ on light
quark masses as well as the phase in this sector.


title: N = 2 Supersymmetry in a Hybrid Inflation Model

abstract:
  The slow roll inflation requires an extremely flat inflaton potential. The
supersymmetry (SUSY) is not only motivated from the gauge hierarchy problem,
but also from stabilizing that flatness of the inflaton potential against
radiative corrections. However, it has been known that the Planck suppressed
higher order terms in the K\"ahler potential receive large radiative
corrections loosing the required flatness in the N = 1 supergravity. We propose
to impose a global N = 2 SUSY on the inflaton sector. What we find is that the
N = 2 SUSY Abelian gauge theory is exactly the same as the desired hybrid
inflation model. The flat potential at the tree level is not our choice of
parameters but a result of the symmetry. We further introduce a cut-off scale
of the theory which is lower than the Planck scale. This lower cut-off scale
suppresses the supergravity loop corrections to the flat inflaton potential.


title: Phenomenology of single transverse spin asymmetries

abstract:
  A unified and consistent phenomenological approach to single transverse spin
asymmetries in the framework of perturbative QCD, with the inclusion of a new
class of spin and k_T dependent distribution and fragmentation functions, is
presented. As an example, results on A_N(p(pol) p --> pion X) and P_Lambda(p p
-->Lambda(pol) X) are shown.


title: Trace anomalies and the $\Delta I = 1/2$ rule

abstract:
  Trace Anomaly Dominance in weak $K$-decays successfully reproduces the
$\Delta I = {1\over 2}$ selection rule results, as observed in $K_S \to \pi\pi,
K_L \to \pi\pi\pi, K_S \to \gamma\gamma$ and $K_L \to \pi^0 \gamma\gamma$.


title: CKM Phases from CP Asymmetries

abstract:
  Measuring phases in the Cabibbo-Kobayashi-Maskawa matrix through CP
asymmetries in B decays is a major goal of current and future experiments.
Methods based on charge-conjugation and isospin symmetries involve very little
theoretical uncertainties, while schemes based on flavor SU(3) involve
uncertainties due to SU(3) breaking. Resolving these uncertainties requires
further studies involving a dialogue between theory and experiments.


title:
Double-diffractive processes in high-resolution missing-mass experiments
  at the Tevatron

abstract:
  We evaluate, in a model-independent way, the signal-to-background ratio for
Higgs -> b bbar detection in exclusive double-diffractive events at the
Tevatron and the LHC. For the missing-mass approach to be able to identify the
Higgs boson, it will be necessary to use a central jet detector and to tag b
quark jets. The signal is predicted to be very small at the Tevatron, but
observable at the LHC. However we note that the background, that is
double-diffractive dijet production, may serve as a unique gluon factory. We
also give estimates for the double-diffractive production of chi_c and chi_b
mesons at the Tevatron. We emphasize that a high-resolution missing-mass
measurement, on its own, is insufficient to identify rare processes.


title: Electroweak Physics for Color Superconductivity

abstract:
  We construct the effective theories describing the electroweak interactions
for the low energy excitations associated with the color superconductive phases
of QCD at high matter density. The main result, for the 3 flavor case, is that
the quasiparticle Goldstone boson $\pi^0$ decay into two physical massless
photons is identical to the zero density case once we use the new Goldstone
decay constant and the modified electric charge $\widetilde{e}=e \cos\theta$,
with $\tan\theta =2e/\sqrt{3}g_s$ and $g_s$ the strong coupling constant. For 2
flavors we find that the coupling of the quarks to the neutral vector boson
$Z^0$ is modified with respect to the zero density case. We finally point out
possible applications of our result to the physics of compact objects.


title: Dynamics of O(N) chiral supersymmetry at finite energy density

abstract:
  We consider an O(N) version of a massive, interacting, chiral supersymmetry
model solved exactly in the large N limit. We demonstrate that the system
approaches a stable attractor at high energy densities, corresponding to a
non-perturbative state for which the relevant field quanta are massless. The
state is one of spontaneously broken O(N), which, due to the influence of
supersymmetry, does not become restored at high energies. Introducing soft
supersymmetry breaking to the Lagrangian results in scalar masses at the soft
breaking scale m_s independent of the mass scale of supersymmetry mu, with even
smaller masses for the fermions.


title: Highlights of CP 2000

abstract:
  Various developing topics in CP violation are reviewed. There are many
theoretical reasons to hope that the CKM paradigm may be incomplete. It is
surely too soon to be claiming new physics in \epsilon^\prime/\epsilon or in
D^0-\bar D^0 mixing, but rare K decays offer interesting places to search for
new physics. It is probably also premature to see a clash between global CKM
fits and current estimates of sin \beta and \gamma, where much more precise
data will soon be available. There are interesting possibilities to look for CP
violation in neutrino oscillations and in Higgs physics. Rapid progress can be
expected now that CP violation is moving to the top of the particle physics
agenda.


title: Dileptons from a Quark Gluon Plasma with Finite Baryon Density

abstract:
  We investigate the effects of a baryon-antibaryon asymmetry on the spectrum
of dileptons radiating from a quark gluon plasma. We demonstrate the existence
of a new set of processes in this regime. The dilepton production rate from the
corresponding diagrams is shown to be as important as that obtained from the
usual quark-antiquark annihilation.


title: pbarp and pp Elastic Scattering in a Multipole-Pomeron Model

abstract:
  We assume that the Pomeron is a sum of Regge multipoles, each corresponding
to a finite gluon ladder. From a fit to the diffraction cone data of pp- and
pbarp- scattering we found that the triple pole is significant for the rise of
the ratio sigma_el/sigma_tot at high energies.


title: Magnetic Collapse of a Neutron Gas: No Magnetar Formation

abstract:
  A degenerate neutron gas in equilibrium with a background of electrons and
protons in a magnetic field exerts its pressure anisotropically, having a
smaller value perpendicular than along the magnetic field. For critical fields
the magnetic pressure may produce the vanishing of the equatorial pressure of
the neutron gas, and the outcome could be a transverse collapse of the star.
This fixes a limit to the fields to be observable in stable pulsars as a
function of their density. The final structure left over after the implosion
might be a mixed phase of nucleons and meson ($\pi^{\pm,0},\kappa^{\pm,0}$)
condensate (a strange star also likely) or a black string, but no magnetar at
all.


title: CP Violation

abstract:
  Three possibilities for the origin of CP violation are discussed: (1) the
Standard Model in which all CP violation is due to one parameter in the CKM
matrix, (2) the superweak model in which all CP violation is due to new physics
and (3) the Standard Model plus new physics. A major goal of B physics is to
distinguish these possibilities. CP violation implies time reversal violation
(TRV) but direct evidence for TRV is difficult to obtain.


title: Low-Energy Supersymmetry and the Tevatron Bottom-Quark Cross Section

abstract:
  A long-standing discrepancy between the bottom-quark production cross section
and predictions of perturbative quantum chromodynamics is addressed. We show
that pair production of light gluinos, of mass 12 to 16 GeV, with two-body
decays into bottom quarks and light bottom squarks, yields a bottom-quark
production rate in agreement with hadron collider data. We examine constraints
on this scenario from low-energy data and make predictions that may be tested
at the next run of the Fermilab Tevatron Collider.


title:
Three-loop non-diagonal current correlators in QCD and NLO corrections
  to single-top-quark production

abstract:
  The non-diagonal correlators of vector and scalar currents are considered at
three-loop order in QCD. The full mass dependence is computed in the case where
one of the quarks is massless and the other one carries the mass $M$. As
applications we consider the single-top-quark production via the process
$q\bar{q}\to t\bar{b}$ and the decay rate of a charged Higgs into hadrons. In
both cases the computed NLO corrections are shown to be numerically much less
important than the leading ones.


title: Study of $\Lambda_b\to\Lambda\nu\bar{\nu}$ with Polarized Baryons

abstract:
  We investigate the decay of $\Lambda_b\to\Lambda\nu\bar{\nu}$ with the
polarized baryons of $\Lambda_b$ and $\Lambda$. With the most general hadronic
form factors, we first study the decay branching ratio and then derive the
longitudinal, normal and transverse polarizations of $\Lambda$ in terms of the
spin unit vectors of $\Lambda_b$ and $\Lambda $ and the momentum of $\Lambda $.
A polarization of $\Lambda_b$ is also discussed.


title:
HELAC-PHEGAS: automatic computation of helicity amplitudes and cross
  sections

abstract:
  HELAC-PHEGAS is a FORTRAN based package that is able to compute automatically
and efficiently tree-order helicity amplitudes and cross sections for arbitrary
scattering processes within the standard electroweak theory and QCD. The
algorithm for the amplitude computation, HELAC, exploits the virtues of the
Dyson-Schwinger equations. The phase-space generation algorithm, PHEGAS,
constructs all possible kinematical mappings dictated by the amplitude under
consideration. Combined with mutichannel self-optimized Monte Carlo integration
it results to efficient cross section evaluation.


title: Hyperon Polarization in Inclusive Hadronic Production

abstract:
  A QCD formula for the polarization in the large-p_T \Lambda hyperon
production in the unpolarized nucleon-nucleon collision at large x_F is
derived. We focus on the mechanism in which the chiral-odd spin-independent
twist-3 quark distribution E_F(x,x) becomes the source of the transversely
polarized quarks fragmenting into the polarized \Lambda. A simple model
estimate for that contribution shows the possibility that it gives rise to a
sizable \Lambda polarization.


title:
Diagnostics of quark-gluon plasma in ultrarelativistic heavy ion
  collisions by hard QCD-processes

abstract:
  We analyze the possibilities for studying properties of dense QCD-matter,
created in ultrarelativistic nuclear collisions, by hard QCD-production
processes, so-called "hard" probes -- heavy quarkonia, hard jets, high mass
dimuons. Special attention is paid to the potential of coming heavy ion
experiments on Large Hadron Collider to observe the rescattering and energy
losses of hard partons in quark-gluon plasma.


title: One-loop QCD corrections to quark scattering at NNLO

abstract:
  We present the O(as^4) virtual QCD corrections to unlike-quark and like-quark
scattering due to the interference of one-loop amplitudes with one-loop
amplitudes. The structure of the infrared divergences agrees with that
predicted by Catani. The results are expressed in an analytic form so that the
relevant expressions for crossed scattering processes can be obtained in a
straightforward manner. The one-loop contributions presented here, together
with the interference of tree with two-loop amplitudes given recently, complete
the 2 to 2 virtual QCD corrections at NNLO for the massless quark scattering
processes.


title:
Levy Stable Law Description of the Intermittent Behavior in Pb+Pb
  Collisions at 158 AGeV/c

abstract:
  The factorial moments (FM) of multiplicity distributions in one- and
two-dimensions are studied for Pb+Pb collisions at 158 AGeV/c. The results are
compared with FRITIOF, RQMD and VENUS predictions. In the relation between FM
and the number of partitions, $M$, obvious {\it positive} intermittence
exponents, $\phi_q$, are observed. The exponents, $\phi_q$, are compared with
the anomalous dimensions, $d_q$. Then they are expressed in terms of L\'evy
stable indices, $\mu$. Meanwhile the experimental data within the interval,
$2<\eta <6$, fulfills the requirements of the L\'evy stable region ($0 \le \mu
\le 2$), the results from the other intervals are away from this region. All
their corresponding indices have negative values.


title:
Confining strings in the Abelian-projected SU(3)-gluodynamics II.
  4D-case with $\theta$-term

abstract:
  The generalization of 4D confining string theory to the SU(3)-inspired case
is derived. It describes string representation of the Wilson loop in the
SU(3)-analogue of compact QED extended by the $\theta$-term. It is shown that
although the obtained theory of confining strings differs from that of compact
QED, their low-energy limits have the same functional form. This fact leads to
the appearance of the string $\theta$-term in the low-energy limit of the
SU(3)-inspired confining string theory. In particular, it is shown that in the
extreme strong coupling regime, the crumpling of string world sheets could
disappear owing to the string $\theta$-term at $\theta=\pi/12$. Finally, some
characteristic features of the SU(N)-case are pointed out.


title:
Color degrees of freedom in nuclear collisions and charmonium
  suppression

abstract:
  In high energy nuclear collisions, the Glauber model is commonly used to
evaluate $J/\psi$ suppression due to inelastic interaction with colorless bound
nucleons. This requires an effective value for the $J/\psi$-nucleon absorption
cross section which is larger than theoretically expected. On the other hand,
multiple nucleon-nucleon collisions mediated by color exchange interactions,
excite their color degrees of freedom. We investigate the importance of this
effect and conclude that the related corrections are important to explain the
effective value extrapolated from experiment.


title: Lensing at cosmological scales: a test of higher dimensional gravity

abstract:
  Recent developments in gravitational lensing astronomy have paved the way to
genuine mappings of the gravitational potential at cosmological scales. We
stress that comparing these data with traditional large scale structure surveys
will provide us with a test of gravity at such scales. These constraints could
be of great importance in the framework of higher dimensional cosmological
models.


title: Aspects of parity, CP, and time reversal violation in hot QCD

abstract:
  We discuss various aspects of parity, CP, and time reversal invariances in
QCD. In particular, we focus attention on the previously proposed possibility
that these experimentally established symmetries of strong interactions may be
broken at finite temperature and/or density. This would have dramatic
signatures in relativistic heavy ion collisions; we describe some of the most
promising signals.


title: Quark description of nuclear matter

abstract:
  We discuss the role of an adjoint chiral condensate for color superconducting
quark matter. Its presence leads to color-flavor locking in two-flavor quark
matter. Color is broken completely as well as chiral symmetry in the two-flavor
theory with coexisting adjoint quark-antiquark and antitriplet quark-quark
condensates. The qualitative properties of this phase match the properties of
ordinary nuclear matter without strange baryons. This complements earlier
proposals by Schafer and Wilczek for a quark description of hadronic phases. We
show for a class of models with effective four-fermion interactions that
adjoint chiral and diquark condensates do not compete, in the sense that
simultaneous condensation occurs for sufficiently strong interactions in the
adjoint chiral channel.


title: Application of new multiloop QCD input to the analysis of $xF_3$ data

abstract:
  The new theoretical input to the analysis of the experimental data of the
CCFR collaboration for $F_3$ structure function of $\nu N$ deep inelastic
scattering is considered. This input comes from the next-to-next-to-leading
order corrections to the anomalous dimensions of the Mellin moments of the
$F_3$ structure function. The QCD scale $\Lambda_{\overline{MS}}^{(4)}$ is
extracted from higher-twist independent fits. The results obtained demonstrate
the minimization of the influence of perturbative QCD contributions to the
value of $\Lambda_{\overline{MS}}^{(4)}$


title: Open Charm Enhancement in Pb+Pb Collisions at SPS

abstract:
  The statistical coalescence model for the production of open and hidden charm
is considered within the canonical ensemble formulation. The data for the
J/\psi multiplicity in Pb+Pb collisions at 158 A GeV are used for the model
prediction of the open charm yield. We find a strong enhancement of the open
charm production, by a factor of about 2--4, over the standard hard-collision
model extrapolation from nucleon-nucleon to nucleus-nucleus collisions. A
possible mechanism of the open charm enhancement in A+A collisions at the SPS
energies is proposed.


title: Pomeron contribution to Spin-flip

abstract:
  The pp polarization data confirm the presence of a diffractive-like (Pomeron)
contribution in the spin-flip amplitude. The extrapolation to RHIC energies
does not appear very promising.


title: Exploring Neutrino Oscillations with Superbeams

abstract:
  We consider the medium- and long-baseline oscillation physics capabilities of
intense muon-neutrino and muon-antineutrino beams produced using future
upgraded megawatt-scale high-energy proton beams. In particular we consider the
potential of these conventional neutrino ``superbeams'' for observing
\nu_\mu\to\nu_e oscillations, determining the hierarchy of neutrino mass
eigenstates, and measuring CP-violation in the lepton sector. The physics
capabilities of superbeams are explored as a function of the beam energy,
baseline, and the detector parameters. The trade-offs between very large
detectors with poor background rejection and smaller detectors with excellent
background rejection are illustrated. We find that it may be possible to
observe \nu_\mu\to\nu_e oscillations with a superbeam provided that the
amplitude parameter \sin^2 2\theta_{13} is larger than a few \times 10^{-3}. If
\sin^2 2\theta_{13} is of order 10^{-2} or larger, then the neutrino mass
hierarchy can be determined in long-baseline experiments, and if in addition
the large mixing angle MSW solution describes the solar neutrino deficit then
there is a small region of parameter space within which maximal CP-violation in
the lepton sector would be observable in a low-energy medium-baseline
experiment. We explicitly consider massive water Cherenkov and liquid argon
detectors at superbeams with neutrino energies ranging from 1 GeV to 15 GeV,
and baselines from 295 km to 9300 km. Finally, we compare the oscillation
physics prospects at superbeams with the corresponding prospects at neutrino
factories. The sensitivity at a neutrino factory to CP violation and the
neutrino mass hierarchy extends to values of the amplitude parameter \sin^2
2\theta_{13} that are one to two orders of magnitude lower than at a superbeam.


title: Non-Oscillation Searches of Neutrino Mass in the Age of Oscillations

abstract:
  We focus on the implications of the oscillations for the shape of nuclear
beta-spectrum (=direct search for nu mass). This is of interest because of the
existing bound, m_(nu_e)<2.2 eV, that could improve by one order of magnitude
with future experiments. We stress important connections with the results of
Liquid Scintillator Neutrino Detector, nu_e disappearance experiments,
supernova neutrinos and neutrinoless double beta decay.


title: V-A hadronic tau decays : a QCD laboratory

abstract:
  Recent ALEPH/OPAL data on the V-A spectral functions from hadronic tau decays
are used for fixing the QCD continuum threshold at which the first and second
Weinberg sum rules should be satisfied in the chiral limit, and for predicting
the values of the low-energy constants f_\pi,~m_{\pi^+}-m_{\pi^0} and {L}_{10}.
Some DMO-like sum rules and the $\tau$-total hadronic widths R_{\tau,V-A} are
also used for extracting the values of the D=6,~8 QCD vacuum condensates and
the corresponding (in the chiral limit) electroweak kaon penguin matrix
elements Q^{3/2}_{8,7}\ra_{2\pi},, where a deviation from the vacuum saturation
estimate has been obtained. Combining these results with the one of the QCD
penguin matrix element Q^{1/2}_{6}\ra_{2\pi} obtained from a (maximal) \bar
qq-gluonium mixing scheme from the scalar meson sum rules, we deduce, in the
Electroweak Standard Model (ESM), the conservative upper bound for the
CP-violating ratio: \epsilon'/\epsilon \leq (22\pm 9) 10^{-4}, in agreement
with the present measurements.


title: Cold Dark Matter detection in SUSY models at large tan(beta)

abstract:
  We study the direct detection rate for SUSY cold dark matter (CDM) predicted
by the minimal supersymmetric standard model with universal boundary conditions
and large values for tan(beta). The relic abundance of the lightest
supersymmetric particle (LSP), assumed to be approximately a bino, is obtained
by including its coannihilations with the next-to-lightest supersymmetric
particle (NLSP), which is the lightest s-tau. The cosmological constraint on
this quantity severely limits the allowed SUSY parameter space, especially in
the case the CP-even Higgs has mass of around 114 GeV. We find that for large
tan(beta) it is possible to find a subsection of the allowed parameter space,
which yields detectable rates in the currently planned experiments.


title: Impact of bosonic decays on the search for t~_1 and b~_1 squarks

abstract:
  We perform a detailed study of the decays of the lighter top and bottom
squarks (t~_1 and b~_1) in the Minimal Supersymmetric Standard Model (MSSM). We
show that the decays into Higgs or gauge bosons, i.e. t~_1 -> b~_1 + (H^+ or
W^+) and b~_1 -> t~_1 + (H^- or W^-), can be dominant in a wide range of the
MSSM parameters due to the large Yukawa couplings and mixings of t~ and b~.
Compared to the decays into fermions, such as t~_1 -> t + (neutralino_i or
gluino) and t~_1 -> b + chargino_j, these bosonic decay modes can have
significantly different decay distributions. We also show that the effect of
the supersymmetric QCD running of the quark and squark parameters on the t~_1
and b~_1 decay branching ratios is quite dramatic. These could have an
important impact on the search for t~_1 and b~_1 and the determination of the
MSSM parameters at future colliders.


title:
On Contributions of Two-Particle Correlation Functions to the
  Intermittent behavior in Heavy-Ion Collisions

abstract:
  The factorial moments (FM) of the multiplicity distributions in one- and
two-dimensions are studied in Pb+Pb collisions at 158 AGeV. Obvious
intermittency slopes are observed in the relation between FM and the partition
number M. The Bose-Einstein correlations (BEC) are investigated in the emulsion
data sample. The influences of the two-particle correlation functions (TPCF) on
the scaling behavior of FM are also investigated. The dependence of TPCF on the
invariant relative momentum Q as well as on the pseudo-rapidity $\delta\eta$
are calculated. It is found that TPCF fulfill the requirements of a power-law
scaling comparable with the scaling rule of FM. The expected contributions of
TPCD to FM are quantitatively estimated.


title:
Comparison of Pion-Kaon Scattering in SU(3) Chiral Perturbation Theory
  and Dispersion Relations

abstract:
  We establish the framework for the comparison of $\pi K$ scattering
amplitudes from SU(3) chiral perturbation theory with suitable dispersive
representations which result from the combination of certain fixed-t dispersion
relations with dispersion relations on hyperbolic curves. This allows for
predictions for some combinations of low energy constants appearing in higher
order calculations of chiral perturbation theory. Using a simple
parametrization for the lowest partial waves, first estimates for some
combinations are presented.


title: Report of the Working Group on Goldstone Bosons

abstract:
  An overview is presented of the talks in the working group on Goldstone
Bosons. Topics touched on are CP-violation in the Kaon system, rare Kaon
decays, $\pi\pi$-scattering, $\phi$-meson decays, scalar mesons, form-factors
and polarizabilities, $\eta$-decays, chiral symmetry breaking, connections with
QCD at short-distances and effective theories for electroweak physics.


title: Parton showers and multijet events

abstract:
  A Monte-Carlo event-generator has been developed which is dedicated to
simulate electron-positron annihilations. Especially a new approach for the
combination of matrix elements and parton showers ensures the independence of
the hadronization parameters from the CMS energy. This enables for the first
time the description of multijet-topologies, e.g. four jet angles, over a wide
range of energy, without changing any parameter of the model. Covering all
processes of the standard model our simulator is capable to describe
experiments at present and future accelerators, i.e. the LEP collider and a
possible Next Linear Collider(NLC).


title: A Short Introduction to Non-Relativistic Effective Field Theories

abstract:
  I discuss effective field theories for heavy bound systems, particularly
bound systems involving two heavy quarks. The emphasis is on the relevant
concepts and on interesting physical applications and results.


title: Window on Higgs Boson: Fourth Generation $b^\prime$ Decays Revisited

abstract:
  Direct and indirect searches of the Higgs boson suggest that 113 GeV
$\lesssim m_H \lesssim$ 170 GeV is likely. With the LEP era over and the
Tevatron Run II search via $p\bar p \to WH+X$ arduous, we revisit a case where
$WH$ or $ZH +$ jets could arise via strong $b^\prime\bar b^\prime$ pair
production. In contrast to 10 years ago, the tight electroweak constraint on
$t^\prime$--$b^\prime$ (hence $t^\prime$--$t$) splitting reduces FCNC
$b^\prime\to bZ$, $bH$ rates, making $b^\prime\to cW$ naturally competitive.
Such a "cocktail solution" is precisely the mix that could evade the CDF search
for $b^\prime\to bZ$, and the $b^\prime$ may well be lurking below the top. In
light of the Higgs program, this two-in-one strategy should be pursued.


title:
Non Linear Breaking of the Electroweak Symmetry and Large Extra
  Dimensions

abstract:
  We consider the coupling to gravity in 4+delta dimensions of a non linear
electroweak symmetry breaking sector, with delta compactified dimensions, and
derive an effective lagrangian by integrating over the KK excitations of the
graviton and of the dilaton. The effective chiral lagrangian describes the
interactions of the electroweak gauge bosons and the goldstone bosons from the
electroweak breaking.


title:
GRAPE-Dilepton (version1.1), A Generator for Dilepton Production in ep
  Collisions

abstract:
  GRAPE-Dilepton is a Monte Carlo event generator for dilepton production in ep
collisions. The cross-section calculation is based on the exact matrix elements
in the electroweak theory at tree level. The dilepton productions via $\gamma
\gamma$, $\gamma Z^0$, $Z^0 Z^0$ collisions and via photon internal conversion
are taken into account. In addition, the effects of the $Z^0$ on/off-shell
production are also included. The relevant Feynman amplitudes are generated by
the automatic calculation system GRACE. The calculation of the proton vertex
covers the whole kinematical region. This generator has an interface to PYTHIA
and SOPHIA to obtain complete hadronic final states.


title:
Single charged Higgs boson production at next generation linear
  colliders

abstract:
  We study the single production of charged Higgs bosons in e+e- collisions,
chiefly in the Minimal Supersymmetric Standard Model. Our analysis complements
foregoing studies of the pair production channel especially in regions where
the kinematic constraint suppresses pair production. We present cross sections
relevant to experiments at the next generation linear colliders and some brief
discussions of their phenomenology. Our analysis shows that the single
production is a useful alternative channel for studying the phenomenology of
charged Higgs bosons, and there are regions of parameter space where it is
accessible beyond the kinematic limit for pair production.


title: Chargino searches at LEP for complex MSSM parameters

abstract:
  We reanalyze the results of the chargino searches at LEP (on the basis of the
DELPHI 189 GeV data sample), including the possibility of complex MSSM
parameters. We point out the possible differences between the complex- and
real-parameter analysis. We check that the regions excluded by ``standard''
analyses remain generally robust against the introduction of complex
parameters, with the exception of light sneutrino and low $\tan\beta$ scenario,
where additional constraints like those given by the $Z^0$ width or electric
dipole moment measurements are necessary.


title: On the parametrization of atmospheric muon angular flux underwater

abstract:
  The analytical expression for angular integral flux of atmospheric muons in
matter with the explicit relation of its parameters with those of the sea level
spectrum is obtained. The fitting formula for the sea level muon spectrum at
different zenith angles for spherical atmosphere is proposed. The concrete
calculations for pure water are presented. Fluctuations of muon energy losses
are taken into account by means of parametrized correction factor calculated
using survival probabilities resulted from Monte Carlo simulations.
Parametrizations of all continuous energy losses are obtained with using the
most recent expressions for muon interaction cross-sections. The corresponding
parametrization errors and field of method application are comprehensively
discussed. The proposed formulae could be useful primarily for experimentalists
processing data of arrays located deep under water or under ice.


title: Kaon Physics with Light Sgoldstinos and Parity Conservation

abstract:
  Superpartners of goldstino -- scalar and pseudoscalar sgoldstinos -- interact
weakly with ordinary particles. One or both of them may be light. We consider a
class of supersymmetric extensions of the Standard Model in which interactions
of sgoldstinos with quarks and gluons conserve parity but do not conserve quark
flavor. If the pseudoscalar sgoldstino $P$ is light, m_P<(m_K-2m_\pi), and the
scalar sgoldstino is heavier, m_S>(m_K-m_\pi), an interesting place for
experimental searches is the poorly explored area of three-body decays of
kaons, K^0_{S,L}\to\pi^+\pi^- P, K^0_{S,L}\to\pi^0\pi^0 P and K^+\to\pi^+\pi^0
P, with $P$ subsequently decaying into \gamma\gamma, possibly e^+e^-, or flying
away from the detector. We evaluate the constraints on the flavor-violating
coupling of sgoldstino to quarks which are imposed by K^0_L-K^0_S mass
difference and CP-violation in neutral kaon system, and find that these
constraints allow for fairly large Br(K\to\pi\pi P). We find that the most
interesting ranges of branching ratios start at Br(K^0_L\to\pi\pi P)\sim
10^{-3}, Br(K^+\to\pi^+\pi^0 P)\sim 10^{-4}, Br(K_S^0\to\pi\pi P)\sim 10^{-3}.
These searches for light pseudoscalar sgoldstino would be sensitive to the
supersymmetry breaking scale \sqrt{F} in the 100 TeV range and above. We also
briefly discuss the cases of light scalar sgoldstino and relatively heavy
sgoldstinos.


title:
Spin Dependent Fragmentation Functions for Heavy Flavor Baryons and
  Single Heavy Hyperon Polarization

abstract:
  Spin dependent fragmentation functions for heavy flavor quarks to fragment
into heavy baryons are calculated in a quark-diquark model. The production of
intermediate spin 1/2 and 3/2 excited states is explicity included. $\Lambda_b$
, $\Lambda_c$ and $\Xi_c$ production rate and polarization at LEP energies are
calculated and, where possible, compared with experiment. A different approach,
also relying on a heavy quark-diquark model, is proposed for the small momentum
transfer inclusive production of polarized heavy flavor hyperons. The predicted
$\Lambda_c$ polarization is roughly in agreement with experiment.


title: The color dipole picture of the Drell-Yan process

abstract:
  At high energies, Drell-Yan (DY) dilepton production viewed in the target
rest frame should be interpreted as bremsstrahlung and can be expressed in
terms of the same color dipole cross section as DIS. We compute DY cross
sections on a nucleon target with the realistic parameterization for the dipole
cross section saturated at large separations. The results are compared to
experimental data and predictions for RHIC are presented. The transverse
momentum distribution of the DY process is calculated and energy growth is
expected to be steeper at large than at small transverse momenta. We also
calculate the DY angular distribution and investigate deviations from the
1+cos^2(\theta) shape.


title: On neutrino family problem

abstract:
  The experiment conducted at the Brookhaven AGS at 1962 [1] on the interaction
of high-energy neutrinos with matter is considered in literature the
observation of electron and muon types of neutrinos. After analysis of the
experiment we have concluded that the latter does not give direct evidence of
the neutrino family existence.


title: Compatibility of various approaches to heavy-quark fragmentation

abstract:
  We find that the definition of the heavy-quark fragmentation function given
by Jaffe and Randall differs by a factor of the longitudinal-momentum fraction
z from the standard Collins-Soper definition. Once this factor is taken into
account, the explicit calculation of Braaten et al. is found to be in agreement
with the general analysis of Jaffe and Randall. We also examine the model of
Peterson et al. for heavy-quark fragmentation and find that the quoted values
of the width and of the value of $z$ at the maximum are in error. The corrected
values are in agreement with the analysis of Jaffe and Randall.


title:
Can we distinguish SUSY breaking terms between weakly and strongly
  coupled heterotic string theories ?

abstract:
  We study soft SUSY breaking terms in heterotic M-theory. We show that both
weakly and strongly coupled heterotic string models lead to the same relations
of soft SUSY breaking terms, $A=-M$ and $m^2 = M^2/3$, up to $O((\alpha
T/S)^2)$.


title: Enforced Electrical Neutrality of the Color-Flavor Locked Phase

abstract:
  We demonstrate that quark matter in the color-flavor locked phase of QCD is
rigorously electrically neutral, despite the unequal quark masses, and even in
the presence of an electron chemical potential. As long as the strange quark
mass and the electron chemical potential do not preclude the color-flavor
locked phase, quark matter is automatically neutral. No electrons are required
and none are admitted.


title: P and T Odd Asymmetries in Lepton Flavor Violating Tau Decays

abstract:
  We calculated the differential cross sections of the processes in which one
of the pair created tau particles at an e^+ e^- collider decays into lepton
flavor violating final states e.g. tau -> mu gamma, tau -> 3 mu, tau -> mu ee.
Using the correlations between angular distributions of both sides of tau
decays, we can obtain information on parity and CP violations of lepton flavor
non-conserving interactions. The formulae derived here are useful in
distinguishing different models, since each model of physics beyond the
standard model predicts different angular correlations. We also calculate
angular distributions of the major background process to tau -> l gamma search,
namely tau -> l nu \bar{\nu} gamma, and discuss usefulness of the angular
correlation for background suppression.


title: Domain walls of high-density QCD

abstract:
  We show that in very dense quark matter there must exist metastable domain
walls where the axial U(1) phase of the color-superconducting condensate
changes by 2pi. The decay rate of the domain walls is exponentially suppressed
and we compute it semiclassically. We give an estimate of the critical chemical
potential above which our analysis is under theoretical control.


title: Diffraction at HERA and Prospects with H1

abstract:
  In the context of the tremendous progress achieved at HERA in diffraction and
the need for a new level of statistical and systematic precision, the new very
large acceptance forward spectrometer planned by H1 (VFPS) is presented and the
physics issues are stressed.


title: Radion signature in $\gamma\gamma$ scattering

abstract:
  We investigate the phenomenological consequences of the possible existence of
the radion at a TeV-scale for $\gamma\gamma$ scattering in the TeV range. We
find that polarized cross-sections only give possible experimental signatures
for the radion.


title: A frequentist analysis of solar neutrino data

abstract:
  We present a Monte Carlo analysis in terms of neutrino oscillations of the
total rates measured in solar neutrino experiments in the framework of
frequentist statistics. We show that the goodness of fit and the confidence
level of the allowed regions in the space of the neutrino oscillation
parameters are significantly overestimated in the standard method. We also
present a calculation of exact allowed regions with correct frequentist
coverage. We show that the exact VO, LMA and LOW regions are much larger than
the standard ones and merge together giving an allowed band at large mixing
angles for all Delta m^2 > 10^{-10} eV^2.


title:
Coordinate Space Distributions of Antiquark Flavor Asymmetries in the
  Proton

abstract:
  We examine the space-time properties of the distribution (dbar - ubar) and
dbar/ubar in the proton. The difference of the antiquark distributions shows
the expected peak at the approximate pion Compton wavelength and is
supportative of the thesis that the meson cloud of the nucleon is at the origin
of the asymmetry of (dbar - ubar), with the pion cloud playing a dominant role.


title: Majorana Neutrino Masses and Neutrino Oscillations

abstract:
  We examine some patterns of Majorana neutrino mass matrix which is compatible
with the phenomenological lepton flavor mixing matrix and non-observation of
neutrinoless double beta decay. Imposing $(M_{\nu})_{ee}=0$ for the Majorana
neutrino mass matrix in the leading order, we obtain a relationship between the
solar mixing angle and the neutrino masses $m_1$ and $m_2$. Additional possible
texture zeros are assigned to the mass matrix so as for the nonvanishing
$\theta_{13}$ to be predictable in terms of neutrino masses. We also show how
three neutrino masses can be predicted from the solar mixing angle and the
experimental results of $\Delta m^2_{sol}$ and $\Delta m^2_{atm}$ in this
framework, and we discuss naturality of the forms of the mass matrix found in
our work.


title: On possible $\Theta$ vacua states in heavy ion collisions

abstract:
  We have simulated the possible $\Theta$ vacua states in heavy ion collisions.
In a quench like scenario, random phases of the chiral fields were evolved in a
zero temperature potential incorporating the breaking of $U_A(1)$ symmetry.
Initial random phases very quickly settles into oscillation around the values
dictated by the potential. The simulation indicate that $\Theta$ vacua states
that can be populated in heavy ion collisions is a coherent superposition of a
number of modes.


title: Statistical model for pionic partons

abstract:
  We present a model for the structure of the pion. Based on ideas of a
recently developed statistical model of the nucleon, we assume the pion to be a
gas of partons. The finite-size corrections (FSC) are incorporated through two
parameters. Using the same two FSC parameters for the proton and pion we
reproduce quantitatively the data on $\pi^- N \to \mu^+ \mu^- X$ Drell-Yan
production and valence quark distribution of the pion.


title: Radiative VPgamma transitions and eta-eta' mixing

abstract:
  A value for the $\eta$-$\eta^\prime$ mixing angle is extracted from the data
on $VP\gamma$ transitions using simple quark-model ideas. The set of data
covers {\it all} possible radiative transitions between the pseudoscalar and
vector meson nonets. Two main ingredients of the model are the introduction of
flavour-dependent overlaps for the various $q\bar{q}$ wave functions and the
use of the quark-flavour basis to describe the $\eta$-$\eta^\prime$ system. In
this basis the mixing angle is found to be $\phi_P=(37.7\pm 2.4)^\circ$.


title: Chiral loop and LsigmaM predictions for phi->pi0etagamma

abstract:
  A prediction for the contributions of chiral loops and the L$\sigma$M model
to the radiative $\phi\to\pi^0\eta\gamma$ decay mode is presented. The
L$\sigma$M is used as an appropriate framework for describing the pole effects
of the $a_0(980)$ scalar resonance. As a result, a better agreement with
present available data is achieved for the higher part of the $\pi^0\eta$
invariant mass spectrum. For the branching ratio, a value of
$B(\phi\to\pi^0\eta\gamma)=(0.75$--$0.95)\times 10^{-4}$ is found.


title: Prediction of three heavy spin-0 particles in the SM

abstract:
  The axial-vector couplings of the internediate bosons with fermions lead to
the prediction of three very heavy spin-0 states in the SM, whose masses are
about 10^{14}GeV. If these states on mass shell there are problems of negative
probability. A new perturbation theory of the SM is proposed.


title: Thermal Production of Gravitinos

abstract:
  We evaluate the gravitino production rate in supersymmetric QCD at high
temperature to leading order in the gauge coupling. The result, which is
obtained by using the resummed gluon propagator, depends logarithmically on the
gluon plasma mass. As a byproduct, a new result for the axion production rate
in a QED plasma is obtained. The implicatons for the cosmological dark matter
problem are briefly discussed, in particular the intriguing possibility that
gravitinos are the dominant part of cold dark matter.


title: Expansion of bound-state energies in powers of m/M

abstract:
  We describe a new approach to computing energy levels of a non-relativistic
bound-state of two constituents with masses M and m, by a systematic expansion
in powers of m/M. After discussing the method, we demonstrate its potential
with an example of the radiative recoil corrections to the Lamb shift and
hyperfine splitting relevant for the hydrogen, muonic hydrogen, and muonium. A
discrepancy between two previous calculations of O(alpha(Zalpha)^5 m^2/M)
radiative recoil corrections to the Lamb shift is resolved and several new
terms of O(alpha(Zalpha)^5 m^4/M^3) and higher are obtained.


title: Scales and Phases in Particle Physics and Cosmology

abstract:
  I describe and analyze the various energy scales that emerge from studying
the structure of the Standard Models of particle physics and cosmology.
Remarkably, save for the scale of the cosmological vacuum energy, all the
scales below the Fermi scale appear to be naturally associated with generalized
see-saw mechanisms. I also briefly discuss the known and presumed CP-violating
phases emerging from physics associated with these models and their physical
extensions. I end by commenting on the insights one might expect to gain from
experiment on these issues in the next decade.


title: Seesaw neutrino masses and mixing with extended democracy

abstract:
  In the context of a minimal extension of the Standard Model with three extra
heavy right-handed neutrinos, we propose a model for neutrino masses and mixing
based on the hipothesis of a complete alignment of the lepton mass matrices in
flavour space. Considering a uniform quasi-democratic structure for these
matrices, we show that, in the presence of a highly hierarchical right-handed
neutrino mass spectrum, the effective neutrino mass matrix, obtained through
the seesaw mechanism, can reproduce all the solutions of the solar neutrino
problem.


title: High-energy neutrino conversion and the lepton asymmetry in the universe

abstract:
  We study matter effects on oscillations of high-energy neutrinos in the
Universe. Substantial effect can be produced by scattering of the neutrinos
from cosmological sources ($z\gta 1$) on the relic neutrino background,
provided that the latter has large CP-asymmetry: $\eta\equiv
(n_\nu-n_{\bar{\nu}})/n_\gamma\gta 1$, where $n_\nu$, $n_{\bar{\nu}}$ and
$n_\gamma$ are the concentrations of neutrinos, antineutrinos and photons. We
consider in details the dynamics of conversion in the expanding neutrino
background. Applications are given to the diffuse fluxes of neutrinos from
GRBs, AGN, and the decay of super-heavy relics. We find that the vacuum
oscillation probability can be modified by $\sim (10-20)%$ and in extreme cases
allowed by present bounds on $\eta$ the effect can reach $\sim 100%$.
Signatures of matter effects would consist (i) for both active-active and
active-sterile conversion, in a deviation of the numbers of events produced in
a detector by neutrinos of different flavours,
$N_{\alpha}~(\alpha=e,\mu,\tau)$, and of their ratios from the values given by
vacuum oscillations; such deviations can reach $\sim 5-15%$, (ii) for
active-sterile conversion, in a characteristic energy dependence of the ratios
$N_{e}/N_{\mu},N_{e}/N_{\tau},N_{\mu}/N_{\tau}$. Searches for these matter
effects will probe large CP and lepton asymmetries in the universe.


title:
Is nonperturbative inflatino production during preheating a real threat
  to cosmology?

abstract:
  We discuss toy models where supersymmetry is broken due to non-vanishing
time-varying vacuum expectation value of the inflaton field during preheating.
We discuss the production of inflatino the superpartner of inflaton due to
vacuum fluctuations and then we argue that they do not survive until
nucleosynthesis and decay along with the inflaton to produce a thermal bath
after preheating. Thus the only relevant remnant is the helicity \pm 3/2
gravitinos which can genuinely cause problem to nucleosynthesis.


title: QCD prediction for heavy boson transverse momentum distributions

abstract:
  We investigate the predictive power of Collins, Soper, and Sterman's
$b$-space QCD resummation formalism for transverse momentum ($Q_T$)
distributions of heavy boson production in hadronic collisions. We show that
the predictive power of the resummation formalism has a strong dependence on
the collision energy $\sqrt{S}$ in addition to its well-known $Q^2$ dependence,
and the $\sqrt{S}$ dependence improves the predictive power at collider
energies. We demonstrate that at Tevatron and the LHC energies, the $Q_T$
distributions derived from $b$-space resummation are not sensitive to the
nonperturbative input at large $b$, and give good descriptions of the $Q_T$
distributions of heavy boson production at all transverse momenta $Q_T \leq Q$.


title:
Neutrino Magnetic Moment Solution for the Solar Neutrino Problem and the
  SNO Experiment

abstract:
  The motivations for the magnetic moment solution to the solar neutrino
problem are briefly reviewed and the expected values for a number of
observables to be measured by the SNO experiment are calculated assuming three
different solar magnetic field profiles. The observables examined are the
charged current event rate, the ratio of the neutral current to the charged
current event rates and the charged current electron spectrum as well as their
first and second moments. The dependence of results on the hep neutrino flux is
also analysed and a comparison is made with the corresponding oscillation
results.


title:
An explanation of the "negative neutrino mass squared" anomaly in
  tritium $ \beta$-decay based on a theory of mass

abstract:
  A proposed solution of the anomalous behavior of the electron spectrum near
the endpoint of tritium $\beta$-decay is offered. It is based on a new theory
of mass in which mass becomes a dynamical variable, and the electron in the
tritium $\beta$-decay has a narrow mass distribution. The predicted Kurie plots
explain the main feature (``$m_{\nu}^2 < 0 $'') of this anomalous behavior.


title: Historical roots of gauge invariance

abstract:
  Gauge invariance is the basis of the modern theory of electroweak and strong
interactions (the so called Standard Model). The roots of gauge invariance go
back to the year 1820 when electromagnetism was discovered and the first
electrodynamic theory was proposed. Subsequent developments led to the
discovery that different forms of the vector potential result in the same
observable forces. The partial arbitrariness of the vector potential A brought
forth various restrictions on it. div A = 0 was proposed by J. C. Maxwell;
4-div A = 0 was proposed L. V. Lorenz in the middle of 1860's . In most of the
modern texts the latter condition is attributed to H. A. Lorentz, who half a
century later was one of the key figures in the final formulation of classical
electrodynamics. In 1926 a relativistic quantum-mechanical equation for charged
spinless particles was formulated by E. Schrodinger, O. Klein, and V. Fock. The
latter discovered that this equation is invariant with respect to
multiplication of the wave function by a phase factor exp(ieX/hc) with the
accompanying additions to the scalar potential of -dX/cdt and to the vector
potential of grad X. In 1929 H. Weyl proclaimed this invariance as a general
principle and called it Eichinvarianz in German and gauge invariance in
English. The present era of non-abelian gauge theories started in 1954 with the
paper by C. N. Yang and R. L. Mills.


title: Power counting and effective field theory for charmonium

abstract:
  We hypothesize that the correct power counting for charmonia is in the
parameter Lambda_QCD/m_c, but is not based purely on dimensional analysis (as
is HQET). This power counting leads to predictions which differ from those
resulting from the usual velocity power counting rules of NRQCD. In particular,
we show that while Lambda_QCD/m_c power counting preserves the empirically
verified predictions of spin symmetry in decays, it also leads to new
predictions which include: A hierarchy between spin singlet and triplet octet
matrix elements in the J/psi system. A quenching of the net polarization in
production at large transverse momentum. No end point enhancement in radiative
decays. We discuss explicit tests which can differentiate between the
traditional and new theories of NRQCD.


title:
Branching ratios and CP-violating asymmetries of $B_s \to h_1 h_2 $
  decays in the general two-Higgs doublet models

abstract:
  Based on the low-energy effective Hamiltonian with the generalized
factorization, we calculate the new physics contributions to branching ratios
and CP-violating asymmetries of the charmless hadronic decays $B_s \to h_1 h_2$
in the standard model and the general two-Higgs doublet models (models I, II,
and III). Within the considered paramter space, we find the following. (a) In
models I and II, the new physics corrections are always small in size and will
be masked by other larger known theoretical uncertainties. (b) In model III,
the new physics corrections to the branching ratios of those QCD
penguin-dominated decays $\ov B_s \to K^0\etapp, K^+ K^{-*}, etc.$, are large
in size and insensitive to the variations of $\mhp$ and $\nceff$. For tree- or
electroweak penguin-dominated decay modes, however, the new physics corrections
are very small in size. (c) For $\ov B_s \to K^+ K^{-*}$ and other seven decay
modes, the branching ratios are at the level of $(1-3)\times 10^{-5}$ and will
be measurable at the future hadron colliders with large $b$ production. (d)
Among the studied thirty nine $B_s$ meson decay modes, seven of them can have a
CP-violating asymmetry ${\cal A}_{CP}$ larger than 20% in magnitude. The new
physics corrections are small or moderate in magnitude. (e) Because of its
large and $\nceff$ stable branching ratio and CP violating asymmetry, the decay
$\ov B_s \to K^+ K^{-*}$ seems to be the "best" channel to find CP violation of
$B_s$ system through studies of two-body charmless decays of $B_s$ meson.


title:
Integral characteristics of bremsstrahlung and pair photoproduction in a
  medium

abstract:
  The bremsstrahlung of an electron and $e^{-}e^{+}$-pair creation by a photon
in a medium is considered in high-energy region, where influence of the
multiple scattering on the processes (the Landau-Pomeranchuk-Migdal (LPM)
effect) becomes essential. The integral characteristics: the radiation length
and the total probability of radiation and pair photoproduction are analyzed
under influence of the LPM effect.


title:
Observational constraints on models of inflation from the density
  perturbation and gravitino production

abstract:
  Present data require a spectral index $n\gsim 0.95$ at something like
1-$\sigma$ level. If this lower bound survives it will constrain `new' and
`modular' inflation models, while raising it to 1.00 would rule out all of
these models plus many others.
  After inflation, gravitinos are created by the oscillating field until the
`intermediate' epoch when the Hubble parameter falls below the gravitino mass,
or reheating, whichever is earlier. In a wide range of parameter space, these
gravitinos are more abundant than those from thermal collisions, leading to
stronger cosmological constraints.


title: Study of Radiative Leptonic D Meson Decays

abstract:
  We study the radiative leptonic $D$ meson decays of $D^+_{(s)}\to
\l^+\nu_{\l}\gamma$ ($\l=e,\mu,\tau$), $D^0\to \nu\bar{\nu}\gamma$ and $D^0\to
\l^+\l^-\gamma$ ($l=e,\mu$) within the light front quark model. In the standard
model, we find that the decay branching ratios of $D^+_{(s)}\to
e^+\nu_e\gamma$, $D^+_{(s)}\to\mu^+\nu_{\mu}\gamma$ and
$D^+_{(s)}\to\tau^+\nu_{\tau}\gamma$ are $6.9\times 10^{-6}$ ($7.7\times
10^{-5}$), $2.5\times 10^{-5}$ ($2.6\times 10^{-4}$), and $6.0\times 10^{-6}$
($3.2\times 10^{-4}$), and that of $D^0\to\l^+\l^-\gamma$ ($\l=e,\mu$) and
$D^0\to\nu\bar{\nu}\gamma$ are $6.3\times 10^{-11}$ and $2.7\times 10^{-16}$,
respectively.


title: A light Higgs Boson would invite Supersymmmetry

abstract:
  If the Higgs boson weighs about 115 GeV, the effective potential of the
Standard Model becomes unstable above a scale of about 10^6 GeV. This
instability may be rectified only by new bosonic particles such as stop
squarks. However, avoiding the instability requires fine-tuning of the model
couplings, in particular if the theory is not to become non-perturbative before
the Planck scale. Such fine-tuning is automatic in a supersymmetric model, but
is lost if there are no Higgsinos. A light Higgs boson would be prima facie
evidence for supersymmetry in the top-quark and Higgs sectors.


title: Can We Observe the Quark Gluon Plasma in Cosmic Ray Showers ?

abstract:
  The possibility of detection of some features of high energy particle
interactions with detectors placed at medium depths underground through studies
on high energy muons is investigated. These muons carry information about the
early interactions occurring during the development of the hadron cascade near
the top of the atmosphere. They might reveal the effects resulting from
creation of quark gluon plasma in interactions of ultra high energy cosmic ray
iron nuclei with air nuclei.


title: Charge asymmetry of pions in the process $e^-e^+\to e^-e^+\pi^+\pi^-$

abstract:
  The study of the charge asymmetry of produced particles allows to investigate
the interference of different production mechanisms and to determine new
features of the corresponding amplitudes. In the process $e^- e^+ \to e^- e^+
\pi^+ \pi^-$ the two-pion system is produced via two mechanisms: two-photon
(C-even state) and bremsstrahlung (C-odd state) production. We study the charge
asymmetry of pions in a differential in the pion momenta cross section
originating from an interference between these two mechanisms. At low effective
mass of dipions this asymmetry is directly related to the s- and p-phases of
elastic $\pi\pi$ scattering. At higher energies it can give new information
about the $f_0$ meson family, $f_2(1270)$ meson, etc. The asymmetry is
expressed via the pion form factor $F_\pi$ and helicity amplitudes $M_{ab}$ for
the subprocess $\gamma^*\gamma\to \pi^+\pi^-$ as $\sum G_{ab}{\rm
Re}(F_\pi^*M_{ab})$ where we have calculated analytically the coefficients
$G_{ab}$ for the region giving the main contribution to the effect. Several
distributions of pions are presented performing a numerical analysis in a model
with point-like pions. In the region near the dipion threshold the asymmetry is
of the order of 1%. We show that with suitable cuts the signal to background
ratio can be increased up to about 10%.


title: Finite temperature correlation functions

abstract:
  Lattice measurements of the Pisa group (A.Di Giacomo et al., hep-lat/9603018)
are analyzed numerically and parameters of correlation functions are extracted
from the data - both below and above deconfinement temperature Tc. Gluon
condensate is found for six temperatures in the interval 0.956 Tc - 1.131 Tc
and field distributions in deconfined phase are obtained.


title:
Equation of state of strongly coupled Hamiltonian lattice QCD at finite
  density

abstract:
  We calculate the equation of state of strongly coupled Hamiltonian lattice
QCD at finite density by constructing a solution to the equation of motion
corresponding to an effective Hamiltonian using Wilson fermions. 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. This
result is in qualitative agreement with continuum models and should be
verifiable by future numerical simulations.


title: New insights concerning dimension-eight effects in weak decays

abstract:
  Most past work on weak nonleptonic decays has mixed dimensional
regularization in the weak operator product expansion with some form of a
cutoff regularization in the evaluation of the matrix elements. Even with the
usual technique of matching the two schemes, this combination misses physics at
short distance which can be described by dimension eight (and higher dimension)
operators. I describe some recent work with V. Cirigliano and E. Golowich which
clarifies these effects and provides a numerical estimate suggesting that they
are important.


title: Anti-B-B Mixing Constrains Topcolor-Assisted Technicolor

abstract:
  We argue that extended technicolor augmented with topcolor requires that all
mixing between the third and the first two quark generations resides in the
mixing matrix of left-handed down quarks. Then, the anti-B_d--B_d mixing that
occurs in topcolor models constrains the coloron and Z' boson masses to be
greater than about 5 TeV. This implies fine tuning of the topcolor couplings to
better than 1%.


title:
Charged spin 1/2 particle in an arbitrary magnetic field in two spatial
  dimensions: a supersymmetric quantum mechanical system

abstract:
  It is shown that the 2 X 2 matrix Hamiltonian describing the dynamics of a
charged spin 1/2 particle with g-factor 2 moving in an arbitrary, spatially
dependent, magnetic field in two spatial dimensions can be written as the
anticommuator of a nilpotent operator and its hermitian conjugate.
Consequently, the Hamiltonians for the two different spin projections form
partners of a supersymmetric quantum mechanical system. The resulting
supersymmetry algebra can then be exploited to explicitly construct the exact
zero energy ground state wavefunction for the system. Modulo this ground state,
the remainder of the eigenstates and eigenvalues of the two partner
Hamiltonians form positive energy degenerate pairs. We also construct the
spatially asymptotic form of the magnetic field which produces a finite
magnetic flux and associated zero energy normalizable ground state
wavefunction.


title: Energy Spectra of Reactor Neutrinos at KamLAND

abstract:
  The upcoming reactor neutrino experiment, KamLAND, has the ability to explore
the Large Mixing Angle (LMA) solution to the solar neutrino problem. Here, we
investigate the precision to which KamLAND should be able to measure these
parameters, utilizing the distortion of the energy spectrum of reactor
neutrinos. Incomplete knowledge of the fuel composition of the reactors will
lead to some error on this measurement. We estimate the size of this effect.


title: Brane Mediated Supersymmetry Breaking

abstract:
  We propose a mechanism for mediating supersymmetry breaking in Type I string
constructions. The basic set-up consists of a system of three D-branes: two
parallel D-branes, a matter D-brane and a source D-brane, with supersymmetry
breaking communicated via a third D-brane, the mediating D-brane, which
intersects both of the parallel D-branes. We discuss an example in which the
first and second family matter fields correspond to open strings living on the
intersection of the matter D-brane and mediating D-brane, while the gauge
fields, Higgs doublets and third family matter fields correspond to open
strings living on the mediating D-brane. As in gaugino mediated models, the
gauginos and Higgs doublets receive direct soft masses from the source brane,
and flavour-changing neutral currents are naturally suppressed since the first
and second family squarks and sleptons receive suppressed soft masses. However,
unlike the gaugino mediated model, the third family squarks and sleptons
receive unsuppressed soft masses, resulting in a very distinctive spectrum with
heavier stops, sbottoms and staus.


title: Wall Velocity in the MSSM

abstract:
  We compute the wall velocity in the MSSM with W, tops and stops contributing
to the friction. In a wide range of parameters including those which fulfil the
requirements of baryogenesis we find a wall velocity of order v_w=O(0.01) much
below the SM value.


title:
Single chargino production via gluon-gluon fusion in a supersymmetric
  theory with an explicit R-parity violation

abstract:
  We studied the production of single chargino$\tilde{\chi}_1^{\pm}$
accompanied by $\mu^{\mp}$ lepton via gluon-gluon fusion at the LHC. The
numerical analysis of their production rates is carried out in the mSUGRA
scenario with some typical parameter sets. The results show that the cross
sections of the $\tilde{\chi}_1^{\pm}\mu^{\mp}$ productions via gluon-gluon
collision are in the order of $1 \sim 10^{2}$ femto barn quantitatively at the
CERN LHC, and can be competitive with production mechanism via quark-antiquark
annihilation process.


title:
Charged Higgs boson pair production via gluon-gluon collisions in MSSM
  with CP violation

abstract:
  The CP-violating effects to the subprocess $gg\to H^+H^-$ is studied in the
mSUGRA scenario at the CERN LHC, by taking into account the experimental bounds
of electron and neutron EDM's. The CP violation effects in this process are
related to the complex phases of $\mu$ and $A_{f}$ in the mSUGRA scenario. In
our calculation we consider small CP phases of $\mu$ and $A_{f}$ and neglect
the effects of neutral Higgs bosons mixing. In this case the CP effects to the
process mainly come from the complex couplings of Higgs-squark-squark. We find
a strong dependence of charged Higgs boson pair production rate on the complex
couplings in the MSSM parameter space.


title:
An electroweak library for the calculation of EWRC to e+ e- --> f fbar
  within the CalcPHEP project

abstract:
  We present a description of calculations of the electroweak amplitude for e+
e- --> f fbar process. The calculations are done within the OMS (on-mass-shell)
renormalization scheme in two gauges: in Rxi, which allows an explicit control
of gauge invariance by examining cancellation of gauge parameters and search
for gauge-invariant subsets of diagrams, and in the unitary gauge as a
cross-check. The formulae we derived are realized in a FORTRAN code eeffLib,
which is being created within the framework of the project CalcPHEP. We present
a comprehensive comparison between eeffLib results for the light top with
corresponding results of the well-known program ZFITTER for the u ubar channel,
as well as a preliminary comparison with results existing in the world
literature.


title: Evolution equations for the effective four-quark interactions in QCD

abstract:
  A nonperturbative renormalization group equation describes how the momentum
dependent four-quark vertex depends on an infrared cutoff. We find a quasilocal
one-particle irreducible piece generated by (anomaly-free) multi-gluon
exchange. It becomes important at a cutoff scale where scalar and pseudoscalar
meson-bound states are expected to play a role. This interaction remains
subleading as compared to the effective one-gluon exchange contribution. The
local instanton induced four-quark interaction becomes dominant at a scale
around 800 MeV. In absence of a gluon mass the strong dependence of the
one-gluon exchange on the transferred momentum indicates that the pointlike
interactions of the Nambu-Jona-Lasinio model cannot give a very accurate
description of QCD. A pointlike effective four-quark interaction becomes more
realistic in case of spontaneous color symmetry breaking.


title: Supernova Neutrino Detection in Borexino

abstract:
  We calculated the expected neutrino signal in Borexino from a typical Type II
supernova at a distance of 10 kpc. A burst of around 110 events would appear in
Borexino within a time interval of about 10 s. Most of these events would come
from the reaction channel $\bar{\nu}_e+p\to e^++n$, while about 30 events would
be induced by the interaction of the supernova neutrino flux on $^{12}$C in the
liquid scintillator. Borexino can clearly distinguish between the
neutral-current excitations $^{12}{C}(\nu,\nu')^{12}{C}^*$(15.11 MeV) and the
charged-current reactions $^{12}{C}(\nu_e,e^-)^{12}{N}$ and
$^{12}{C}(\bar{\nu}_e,e^+)^{12}{B}$, via their distinctive event signatures.
The ratio of the charged-current to neutral-current neutrino event rates and
their time profiles with respect to each other can provide a handle on
supernova and non-standard neutrino physics (mass and flavor oscillations).


title: Gravitino production during preheating and the equivalence theorem

abstract:
  We review our results on the calculation of helicity 1/2 gravitino production
during preheating. The method we present is based on the equivalence between
goldstinos and longitudinal gravitinos at high energies. The problem is thus
reduced to the standard (Majorana) fermion production after inflation.
Comparison between helicity 3/2 and 1/2 production and with the results
obtained in the unitary gauge is also presented.


title: Hypernuclear potentials and the pseudoscalar meson exchange contribution

abstract:
  The pieces of the hypernuclear strangeness violating potential due to the
pseudoscalar meson exchanges are derived using methods which were successfully
applied to hyperon nonleptonic decays. The estimates are tested by comparison
with measured hyperon nonleptonic decay amplitudes. All isospin changes $\Delta
I=1/2$ and $\Delta I=3/2$ are included in the derived potential. All
calculational methods used are reviewed and described in detail.


title: Direct CP-asymmetry in Inclusive Rare B-decays in 2HDM

abstract:
  The direct CP-asymmetry in the inclusive $B \to X_d \gamma$ and $B \to X_d
e^+ e^ - $ decays is investigated in the two-Higgs doublet extension of the
Standard Model (2HDM). The investigation is performed in the lowest
non-vanishing order of the perturbation theory using the existing restrictions
on the 2HDM parameters space. It is shown that the direct CP-asymmetry in the
$B \to X_d \gamma$ decay can deviate significantly from the Standard Model
predictions. In the presence of only one source of CP-violation (the CKM matrix
weak phase) $a_{CP}(B \to X_d \gamma)$ can have the sign opposite to that in
the SM. The new source of CP-violation can make $|a_{CP}(B \to X_d \gamma)|$
arbitrary small (unlike the SM case) and hence unmeasurable. Quantitatively,
the obtained results suffer from the uncertainty of the choice of
renormalization scale. As for the $B \to X_d e^+ e^ - $ rate asymmetry, its
renormalization scale dependence in the lowest non-vanishing order does not
allow to conclude if this quantity is efficient for testing New Physics beyond
the Standard Model.


title: Lifetimes of b-flavoured hadrons

abstract:
  I discuss the heavy quark expansion for the inclusive widths of heavy-light
hadrons, which predicts quite well the experimental ratios of B_q meson
lifetimes. As for $\Lambda_b$, current determinations of ${\cal O}(m_b^{-3})$
contribution to $\tau(\Lambda_b)$ do not allow to explain the small measured
value of $\tau(\Lambda_b)/\tau(B_d)$. As a final topic, I discuss the
implications of the measurement of the B_c lifetime.