title:
Prospects of measuring $\sin^2 2\Theta_{13}$ and the sign of $\Delta
  m^2$ with a massive magnetized detector for atmospheric neutrinos

abstract:
  The pattern of oscillation parameters emerging from current experimental data
can be further elucidated by the observation of matter effects. In contrast to
planned experiments with conventional neutrino beams, atmospheric neutrinos
offer the possibility to search for Earth-induced matter effects with very long
baselines. Resonant matter effects are asymmetric on neutrinos and
anti-neutrinos, depending on the sign of $\Delta m^2$. In a three-generation
oscillation scenario, this gives access to the mass hierarchy of neutrinos,
while the size of the asymmetry would measure the admixture of electron
neutrinos to muon/tau neutrino oscillations (the mixing angle $\Theta_{13}$).
The sensitivity to these effects is discussed after the detailed simulation of
a realistic experiment based on a massive detector for atmospheric neutrinos
with charge identification. We show how a detector, which measure and
distinguish between $\nu_\mu$ and $\bar{\nu}_\mu$ charged current events, might
be sensitive to matter effects using atmospheric neutrinos, provided the mixing
angle $\Theta_{13}$ is large enough.


title: The Snowmass Points and Slopes: Benchmarks for SUSY Searches

abstract:
  The ``Snowmass Points and Slopes'' (SPS) are a set of benchmark points and
parameter lines in the MSSM parameter space corresponding to different
scenarios in the search for Supersymmetry at present and future experiments.
This set of benchmarks was agreed upon at the 2001 ``Snowmass Workshop on the
Future of Particle Physics'' as a consensus based on different existing
proposals.


title: QCD and e+e- --> Baryon + anti-Baryon

abstract:
  We discuss the QCD constraints on e+e- --> baryon-anti-baryon close to
threshold, in light of the puzzling experimental data which indicate that close
to threshold sigma (e+e- --> n n-bar) > sigma (e+e- --> p p-bar). We focus on
the process e+e- --> Delta Delta-bar, which is particularly simple from the
theoretical point of view. In this case it is possible to make exact QCD
predictions for the relative yields of the four members of the Delta multiplet,
modulo one crucial dynamical assumption.


title: Charmless B Decays to Final States with Radially Excited Vector Mesons

abstract:
  We consider the weak decays of a B meson to final states that contain a
S-wave radially excited vector meson. We consider vector-pseudoscalar final
states and calculate ratios of the type $B \to \rho^{\prime} \pi/B \to \rho
\pi$, $B \to \omega^{\prime} \pi/B \to \omega \pi$ and $B \to \phi^{\prime}
\pi/B \to \phi \pi$ where $\rho^{\prime}$, $\omega^{\prime}$ and
$\phi^{\prime}$ are higher $\rho$, $\omega$ and $\phi$ S-wave radial
excitations. We find such decays to have larger or similar branching ratios
compared to decays where the final state $\rho$, $\omega$ and $\phi$ are in the
ground state. We also study the effect of radial mixing in the vector system
generated from hyperfine interaction and the annihilation term.


title: Positivity of High Density Effective Theory

abstract:
  We show that the effective field theory of low energy modes in dense QCD has
positive Euclidean path integral measure. The complexity of the measure of QCD
at finite chemical potential can be ascribed to modes which are irrelevant to
the dynamics at sufficiently high density. Rigorous inequalities follow at
asymptotic density. Lattice simulation of dense QCD should be possible using
the quark determinant calculated in the effective theory.


title:
The contribution of the four-parton final states to gamma* gamma* ->
  hadrons

abstract:
  In the analysis of the total cross section for the gamma* gamma* -> hadrons
process, we include the four parton final states, which are part of the
O(alpha_s^2) corrections. The four-parton final states contain the diagrams
with gluon exchange in the crossed channel, which constitute the leading order
of the BFKL resummation. We show that the diagrams with gluon exchange in the
crossed channel play an important role in the large Y region, however their
contribution to the cross section must be evaluated exactly. In fact, the
high-energy limit, which constitutes the kinematic framework of the BFKL
resummation, is not sufficiently accurate at LEP2 energies. The inclusion of
the diagrams with gluon exchange in the crossed channel reduces the discrepancy
between the theory and the LEP2 data collected by the L3 Collaboration, but the
data still lie above the theory, even allowing for a large scale uncertainty in
the theory. Thus, in order to describe accurately the data for gamma* gamma* ->
hadrons in the large Y region, corrections of an order higher than O(alpha_s^2)
seem to be necessary.


title: High Energy QCD and the Large Nc Limit

abstract:
  We review recent progress in understanding QCD at high energies and the role
played in it by the large Nc limit. We discuss unitarization of total hadronic
cross sections and saturation of structure functions at high energies.


title: A lower bound on the right-handed neutrino mass from leptogenesis

abstract:
  In the seesaw model, the baryon asymmetry of the Universe can be generated by
the decay of the lightest right-handed neutrino, nu_R. For a hierarchical
spectrum of right-handed neutrinos, we show that there is a model independent
upper bound on the CP asymmetry produced in these decays: epsilon < 3 m_{nu_3}
M_{nu_R}/(8 pi <H_u>^2). This implies that epsilon and the mass M_{nu_R} of the
lightest right-handed neutrino are not independent parameters, as is commonly
assumed. If m_{nu_3} = sqrt{Delta m^2_{atm}} and the nu_R are produced
thermally, then leptogenesis requires a reheat temperature of the Universe
T_{reh} > M_{nu_R} > 10^8 GeV. Reasonable estimates of nu_R production and the
subsequent washout of the asymmetry, as made by Buchmuller and Plumacher, imply
M_{nu_R} > 10^9 GeV, and T_{reh} > 10^{10} GeV. Implications for the gravitino
problem are also discussed.


title: HBT interferometry and the parton-hadron phase transition

abstract:
  We discuss predictions for the pion and kaon interferometry measurements in
relativistic heavy ion collisions at SPS and RHIC energies. In particular, we
confront relativistic transport model calculations that include explicitly a
first-order phase transition from a thermalized quark-gluon plasma to a hadron
gas with recent data from the RHIC experiments. We critically examine the
"HBT-puzzle" both from the theoretical as well as from the experimental point
of view. Alternative scenarios are briefly explained.


title:
QCD corrections to decay-lepton polar and azimuthal angular
  distributions in e+e- -> t tbar in the soft-gluon approximation

abstract:
  QCD corrections to order alpha_s in the soft-gluon approximation to angular
distributions of decay charged leptons in the process e+e- -> t tbar followed
by semileptonic decay of t or tbar, are obtained in the e+e- centre-of-mass
frame. As compared to distributions in the top rest frame, these have the
advantage that they would allow direct comparison with experiment without the
need to reconstruct the top rest frame. The results also do not depend on the
choice of a spin quantization axis for t or tbar. Analytic expression for the
triple distribution in the polar angle of t and polar and azimuthal angles of
the lepton is obtained. Analytic expression is also derived for the
distribution in the charged-lepton polar angle. Numerical values are discussed
for total c.m. energies of 400 GeV, 800 GeV and 1500 GeV.


title: Eta decays at and beyond $\mathbf{p^4}$ in Chiral Perturbation Theory

abstract:
  An overview is given of Chiral Perturbation Theory and various applications
to eta decays. In particular, the main decay $\eta\to3\pi$ is discussed at the
one-loop level, and estimates of the higher order corrections are given. The
importance of $p^6$ and higher order effects in double Dalitz and
$\eta\to\pi^0\gamma\gamma$ decays is pointed out. In all these cases the need
for new experimental results is stressed.


title: TeV Neutrinos from Companion Stars of Rapid-Rotating Neutron Stars

abstract:
  We have estimated the number flux of of mu-neutrinos which are produced due
to the hadronic interactions between the cosmic rays coming from a neutron star
and the matter in a companion star. The event rate at 1 km^2 detectors of
high-energy neutrinos such as ICECUBE, ANTARES and NESTOR is also estimated to
be 2.7 \times 10^4 events yr^-1 when the source is located at 10 kpc away from
the Earth. We have estimated the number of such a system and concluded that
there will be several candidates in our galaxy. Taking these results into
consideration, this scenario is promising and will be confirmed by the future
observations.


title: A stationary relativistic representation of the bound state

abstract:
  We show that a bound system in momentum space can be treated like a gas of
free elementary constituents and a collective excitation of a background field
which represents the countless quantum fluctuations generating the binding
potential. The distribution function of the internal momenta in the bound
system at rest is given by the projection of the solution of a relativistic
bound state equation on the free wave functions of the elementary constituents.
The 4-momentum carried by the collective excitation is the difference between
the bound state 4-momentum and the sum of the free 4-momenta. This definiton
ensures the explicit fulfilment of Lorentz covariance, mass-shell constraints
and single particle normalizability of the bound state function. The discussion
is made for a two particle bound state and can be easily generalized to the
case of three or more particles.


title:
Oscillations of $K^0$ Mesons in the Phase Volume Approach in the
  Standard Model and in the Model of Dynamical Analogy of the
  Cabibbo-Kobayashi-Maskawa Matrices

abstract:
  The elements of the theory of dynamical expansion of the theory of weak
interaction working at the tree level, i.e. the model of dynamical analogy of
Cabibbo-Kobayashi- Maskawa matrices, are given.
  The equation for mass difference of $K^0_1, K^0_2$ mesons or the length of
$K^0, \bar K^0$ meson oscillations in the phase volume approach in the frame
work of the standard model of the weak interactions and the model of dynamical
analogy of Cabibbo-Kobayashi-Maskawa matrices is calculated (in this model the
oscillations of $K^0, \bar K^0$ mesons arise at violation of strangeness by $B$
bosons). Comparison of the length of oscillations in the diagram and phase
volume approaches was done. The length of $K^0 \leftrightarrow \bar K^0$
oscillations in the phase volume approach is much more than the length of these
oscillations in the diagram approach.


title: Light-meson orbital excitations in the QCD string approach

abstract:
  In the framework of the QCD string approach it is shown that the
spin-averaged masses $\bar{M}(nL)$ of all low-lying light mesons are well
described using the string tension $\sigma$ as the only parameter. The Regge
slope $\alpha'_L$ and the intercept $\alpha_L(0)$ of the Regge L-trajectory for
$\bar{M}(nL)$ are calculated analytically and turn out to be $\alpha'_L = 0.80$
GeV${}^{-2}$ (for $L \leq 4$) and $\alpha_L(0) = -0.34$, in good agreement with
the experimental data: $\alpha'_{L {\rm exp}} = 0.81 \pm 0.01$ GeV${}^{-2}$,
$\alpha_{L {\rm exp}}(0) = -0.30 \pm 0.02$. To obtain this strong agreement
with the data the nonperturbative quark self-energy contributions to the meson
masses must be taken into account, which appeared to be large and negative for
small values of L, and are even for larger values of L important for a close
fit. From the present analysis of the meson spectra the restriction $\alpha_s
\leq 0.40$ on the strong coupling is required.


title: Structure of neutrino mass matrix and CP violation

abstract:
  We reconstruct the neutrino mass matrix in the flavor basis, using all
available experimental data on neutrino oscillations. Majorana nature of
neutrinos, normal mass hierarchy (ordering) and validity of the LMA MSW
solution of the solar neutrino problem are assumed. We study dependences of the
mass matrix elements, m_{alpha beta}, on the CP violating Dirac, delta, and
Majorana, rho, sigma, phases, for different values of the mixing angle
theta_{13} and of the absolute mass scale, m_1. The contours of constant mass
in the rho-sigma plane have been constructed for all m_{alpha beta}. These
rho-sigma plots allow to systematically scan all possible structures of the
mass matrix. We identify regions of parameters in which the matrix has (i) a
structure with the dominant mu tau-block, (ii) various hierarchical structures,
(iii) flavor alignment, (iv) structures with special ordering or equalities of
elements, (v) the democratic form. In certain cases the matrix can be
parameterized by powers of a unique expansion (ordering) parameter lambda
approximately 0.2 - 0.3 (lambda_{ord} approximately 0.6 - 0.7). Perspectives to
further restrict the structure of mass matrix in future experiments, in
particular in the beta beta_{0 nu}-decay searches, are discussed.


title: Partial Deconfinement in Color Superconductivity

abstract:
  We analyze the fate of the unbroken SU(2) color gauge interactions for 2
light flavors color superconductivity at non zero temperature. Using a simple
model we compute the deconfining/confining critical temperature and show that
is smaller than the critical temperature for the onset of the superconductive
state itself. The breaking of Lorentz invariance, induced already at zero
temperature by the quark chemical potential, is shown to heavily affect the
value of the critical temperature and all of the relevant features related to
the deconfining transition. Modifying the Polyakov loop model to describe the
SU(2) immersed in the diquark medium we argue that the deconfinement transition
is second order. Having constructed part of the equation of state for the 2
color superconducting phase at low temperatures our results are relevant for
the physics of compact objects featuring a two flavor color superconductive
state.


title: UHECR as Decay Products of Heavy Relics? The Lifetime Problem

abstract:
  The essential features underlying the top-down scenarii for UHECR are
discussed, namely, the stability (or lifetime) imposed to the heavy objects
(particles) whatever they be: topological and non-topological solitons,
X-particles, cosmic defects, microscopic black-holes, fundamental strings. We
provide an unified formula for the quantum decay rate of all these objects as
well as the particle decays in the standard model. The key point in the
top-down scenarii is the necessity to adjust the lifetime of the heavy object
to the age of the universe. This ad-hoc requirement needs a very high
dimensional operator to govern its decay and/or an extremely small coupling
constant. The natural lifetimes of such heavy objects are, however, microscopic
times associated to the GUT energy scale (sim 10^{-28} sec. or shorter). It is
at this energy scale (by the end of inflation) where they could have been
abundantly formed in the early universe and it seems natural that they decayed
shortly after being formed.


title: What exactly is a Skyrmion?

abstract:
  Skyrmions are well known to be baryons because their topological charge has
been positively identified with the baryon number. Beyond that their identity
has never been clear. In view of the possibility of skyrmion production through
Disoriented Chiral Condensates in heavy ion collisions, the exact identity of
the skyrmion must be resolved before they can be identified in experiments. It
is shown that skyrmions are not individual baryons but coherent states of known
baryons and higher resonances on a compact manifold associated with the spin
and flavor symmetry group. An outline of how to calculate exactly the
probability amplitudes of the superposition of physical baryon and excited
baryon states that make up the skyrmion is given.

categories: hep-ph gr-qc hep-th math-ph math.MP nucl-th quant-ph


title: Joint resummation in electroweak boson production

abstract:
  We present a phenomenological application of the joint resummation formalism
to electroweak annihilation processes at measured boson momentum Q_T. This
formalism simultaneously resums at next-to-leading logarithmic accuracy large
threshold and recoil corrections to partonic scattering. We invert the impact
parameter transform using a previously described analytic continuation
procedure. This leads to a well-defined, resummed perturbative cross section
for all nonzero Q_T, which can be compared to resummation carried out directly
in Q_T space. From the structure of the resummed expressions, we also determine
the form of nonperturbative corrections to the cross section and implement
these into our analysis. We obtain a good description of the transverse
momentum distribution of Z bosons produced at the Tevatron collider.


title: Bounds on Charged, Stable Superpartners from Cosmic Ray Production

abstract:
  Supersymmetric models often predict a lightest superpartner (LSP) which is
electrically charged and stable on the timescales of collider experiments. If
such a particle were to be observed experimentally, is it possible to determine
whether or not it is stable on cosmological timescales? Charged, stable
particles are usually considered to be excluded by cosmological arguments
coupled with terrestrial searches for anomalously heavy water molecules. But
when the cosmology is significantly altered, as can happen in models with large
extra dimensions, these arguments are in turn significantly weakened. In this
paper we suggest an alternate way to use searches for superheavy water to
constrain the lifetimes of long-lived, charged particles, independent of most
cosmological assumptions. By considering SUSY production by cosmic rays in the
upper atmosphere, we are able to use current bounds on superheavy water to
constrain the mass scale of squarks and gluinos to be greater than about 230
GeV, assuming a stable, charged LSP. This bound can be increased, but only by
significantly increasing the size of the initial water sample tested.


title:
A new interpretation of one CPT violation test for $K_0 - \bar{K}_0$
  system

abstract:
  Using a more accurate approximation than that applied by Lee--Oehme--Yang we
show that the interpretation of the tests measuring the difference between the
$K_{0}$ mass and the ${\bar K}_{0}$ mass as the CPT--symmetry test is wrong. We
find that in fact such tests are tests for the existence of the hypothetical
interaction allowing the first order $|\Delta S| = 2$ transitions $K_{0}
\rightleftharpoons {\bar K}_{0}$.


title:
Weak Annihilation and the Effective Parameters a_1 and a_2 in
  Nonleptonic D Decays

abstract:
  Based on SU(3) flavor symmetry, many of the quark-graph amplitudes in
two-body nonleptonic decays of charmed mesons can be extracted from experiment,
which enable us to see the relevance and importance of weak annihilation
topologies and to determine the complex parameters $a_1$ and $a_2$ to test the
factorization approach. It is found that $a_2$ in $D\to \bar K^*\pi$ and $D\to
\bar K\rho$ can be different by a factor of 2, indicating that nonfactorizable
corrections to the latter are far more important than the former. The relative
phase between $a_1$ and $a_2$ is about $150^\circ$. Weak annihilation
topologies induced by nearby resonances via final-state rescattering can be
described in a model-independent manner. Although the W-exchange contribution
in $D\to PP$ decays is dominated by resonant final-state interactions (FSIs),
its amplitude in VP decays (V: vector meson, P: pseudoscalar meson) receives
little contributions from FSIs in the quark-antiquark resonance formation. As a
consequence, the sign flip of the W-exchange amplitude in $D\to\bar K^*\pi$ and
$\bar K\rho$ decays, which is needed to explain the relatively real decay
amplitudes of $D\to \bar K\rho$, remains unexplained. SU(3) symmetry is badly
broken in some Cabibbo-suppressed modes and it can be accounted for by the
accumulation of some modest SU(3) violation in individual quark-graph
amplitudes.


title: Two Lectures on Technicolor

abstract:
  These two lectures on technicolor and extended technicolor (ETC) were
presented at l'Ecole de GIF at LAPP, Annecy-le-Vieux, France, in September
2001. In Lecture I, the motivation and structure of this theory of dynamical
breaking of electroweak and flavor symmetries is summarized. The main
phenomenological obstacles to this picture--flavor-changing neutral currents,
precision electroweak measurements, and the large top-quark mass--are reviewed.
Then, their proposed resolutions--walking technicolor and topcolor-assisted
technicolor are discussed. In Lecture II, a scenario for CP violation is
presented based on vacuum alignment for technifermions and quarks. It has the
novel feature of CP--violating phases that are rational multiples of pi to
better than one part in 10^{10} without fine-tuning of parameters. The scheme
thereby avoids light axions and a massless up quark. The mixing of neutral
mesons, the mechanism of top--quark mass generation, and the CP--violating
parameters epsilon and sin(2 beta) strongly constrain the form of
ETC--generated quark mass matrices.


title:
Reexamining radiative decays of $1^{--}$ quarkonium into $\eta'$ and
  $\eta$

abstract:
  Recently CLEO has studied the radiative decay of $\Upsilon$ into $\eta'$ and
an upper limit for the decay has been determined. Confronting with this upper
limit,most of theoretical predictions for the decay fails. After briefly
reviewing these predictions we re-examine the decay by separating
nonperturbative effect related to the quarkonium and that related to $\eta'$ or
$\eta$, in which the later is parameterized by distribution amplitudes of
gluons in $\eta'$. With this factorization approach we obtain theoretical
predictions which are in agreement with experiment. Uncertainties in our
predictions are discussed. The possibly largest uncertainties are from
relativistic corrections for $J/\Psi$ and the value of the charm quark mass. We
argue that the effect of these uncertainties can be reduced by using quarkonium
masses instead of using quark masses. An example of the reduction is shown with
an attempt to explain the violation of the famous 14% rule in radiative decays
of charmonia.


title: Gauge coupling renormalization in orbifold field theories

abstract:
  We investigate the gauge coupling renormalization in orbifold field theories
preserving 4-dimensional N=1 supersymmetry in the framework of 4-dimensional
effective supergravity. As a concrete example, we consider the 5-dimensional
Super-Yang-Mills theory on a slice of AdS_5. In our approach, one-loop gauge
couplings can be determined by the loop-induced axion couplings and the tree
level properties of 4-dimensional effective supergravity which are much easier
to be computed.


title:
Enhanced baryon number violation due to cosmological defects with
  localized fermions along extra dimension

abstract:
  We propose a new scenario of baryon number violation in models with extra
dimensions. In the true vacuum, baryon number is almost conserved due to the
localization mechanism of matter fields, which suppresses the interactions
between quarks and leptons. We consider several types of cosmological defects
in four-dimensional spacetime that shift the center of the localized matter
fields, and show that the magnitudes of the baryon number violating
interactions are well enhanced. Application to baryogenesis is also discussed.


title:
The decays gluino -> stop_1 b-quark W and gluino -> stop_1 c-quark and
  phenomenological implications in supersymmetric theories

abstract:
  We show that the decay gluino -> stop_1 b-quark W is important and can even
be dominant in the region of parameter space where it is kinematically allowed.
We discuss phenomenological implications within the Minimal Supersymmetric
Standard Model and models with broken R-parity. We consider the flavour
diagonal case as well as a possible mixing between squarks of different
generations. In the latter case also the decay gluino -> stop_1 c-quark is
potentially important. We show that the decay gluino -> stop_1 b-quark W is
sensitive to the stop mixing angle. Furthermore we demonstrate that in
scenarios with a higgsino--like LSP the gluino decays mainly into final states
containing top quarks or a light stop if allowed by kinematics.


title: MC generators in CHORUS

abstract:
  This note presents an overview of general-purpose and specific Monte-Carlo
event generators used in the simulation of the CERN - CHORUS experiment, aiming
to search for $\nu_{\mu} \to \nu_{\tau}$ oscillations and charm particle decays
in an emulsion target.


title:
Finite temperature spectral functions of the linear O(N)-model at large
  N applied to the $\pi -\sigma$ system

abstract:
  The thermal evolution of the spectral densities derivable from the two-point
functions of the elementary and the quadratic composite fields of the O(N)
model is studied in the isosinglet channel and in the broken symmetry phase at
infinite N. The results are applied with realistic parameter values to the N=4
case. They provide a reasonable description of the $\sigma$ meson at T=0.
Threshold enhancement is observed around $T\sim 1.07m_\pi$. For higher
temperatures the maximum of the spectral function in the single meson channel
decreases and becomes increasingly rounded.


title: Neutrinoless Double Beta Decay with Negligible Neutrino Mass

abstract:
  If the electron neutrino has an effective nonzero Majorana mass, then
neutrinoless double beta decay will occur. However, the latter is possible also
with a negligible neutrino mass. We show how this may happen in a simple model
of scalar diquarks and dileptons. This possibility allows neutrino masses to be
small and hierarchical, without conflicting with the possible experimental
evidence of neutrinoless double beta decay.


title:
Renormalization of self-consistent Schwinger-Dyson equations at finite
  temperature

abstract:
  We show that Dyson resummation schemes based on Baym's $\Phi$-derivable
approximations can be renormalized with counter term structures solely defined
on the vacuum level. First applications to the self-consistent solution of the
sunset self-energy in $\phi^4$-theory are presented.


title: Double Beta Decay

abstract:
  The motivation, present status, and future plans of the search for the
neutrinoless double beta decay are reviewed. It is argued that, motivated by
the recent observations of neutrino oscillations, there is a reasonable hope
that neutrinoless double beta decay corresponding to the neutrino mass scale
suggested by oscillations, <m_{\nu}> of about 50 meV, actually exists. The
challenges to achieve the sensitivity corresponding to this mass scale, and
plans to overcome them, are described.


title:
The SU(2) and SU(3) chiral phase transitions within Chiral Perturbation
  Theory

abstract:
  The SU(2) and SU(3) chiral phase transitions in a hot gas made of pions,
kaons and etas are studied within the framework of Chiral Perturbation Theory.
By using the meson meson scattering phase shifts in a second order virial
expansion, we are able to describe the temperature dependence of the quark
condensates. We have estimated the critical temperatures where the different
condensates melt. In particular, the SU(3) formalism yields a lower critical
temperature for the non-strange condensates than within SU(2), and also
suggests that the strange condensate may melt at a somewhat higher temperature,
due to the different strange and non-strange quark masses.


title: Two-loop corrections to Light-by-Light scattering in Supersymmetric QED

abstract:
  We use an n-dimensional projection method to calculate helicity amplitudes
for photon-photon scattering up to the two-loop level, for massless particles
inside the loop. We confirm the recent standard model results found by Bern et
al using another calculational method. We further apply the method to N=1 and
N=2 supersymmetric QED. As predicted by the supersymmetric Ward identity, two
of the independent amplitudes vanish. The remaining amplitude simplifies as the
number of supersymmetries increases. For N=2 SUSY QED, only contributions of
weight 4 remain.


title:
Neutrino magnetic moment, large extra dimensions and high energy cosmic
  neutrino spectra

abstract:
  We point out that the presence of bulk neutrinos in models with large extra
spatial dimensions can lead to observable flavour specific deformations in the
spectra of extreme high energy cosmic neutrinos. These deformations are due to
the spin precession of the high energy neutrinos in the background magnetic
fields via electromagnetic interactions. Measurements with existing and
proposed neutrino telescopes which are meant to detect high energy neutrinos
can therefore provide a novel way to probe the size of extra hidden dimensions.
We qualitatively illustrate the flavour suppression due to the Earth, Sun and
intergalactic magnetic fields. An observable consequence of this precession
could be an angular asymmetry for the extreme high energy neutrinos from the
atmosphere and flavour specific deformations of the intergalactic neutrinos.


title: One-loop vertex integrals in heavy-particle effective theories

abstract:
  We give a complete analytical computation of three-point one-loop integrals
with one heavy propagator, up to the third tensor rank, for arbitrary values of
external momenta and masses.


title:
Reexamining nonstandard interaction effects on supernova neutrino flavor
  oscillations

abstract:
  Several extensions of the standard electroweak model allow new four-fermion
interactions (nu_a nu_b * ff) with strength eps_ab*G_F, where (a,b) are flavor
indices. We revisit their effects on flavor oscillations of massive
(anti)neutrinos in supernovae, in order to achieve, in the region above the
protoneutron star, an analytical treatment valid for generic values of the
neutrino mixing angles (omega,phi,psi)=(theta_12,theta_13,theta_23). Assuming
that eps_ab<<1, we find that the leading effects on the flavor transitions
occurring at high (H) and low (L) density along the supernova matter profile
can be simply embedded through the replacements phi-->phi+eps_H and
omega-->omega+eps_L, respectively, where eps_H and eps_L are specific linear
combinations of the eps_ab's. Similar replacements hold for eventual
oscillations in the Earth matter. From a phenomenological point of view, the
most relevant consequence is a possible uncontrolled bias (phi-->phi+eps_H) in
the value of the mixing angle phi inferred by inversion of supernova neutrino
data. Such a drawback, however, does not preclude the discrimination of the
neutrino mass spectrum hierarchy (direct or inverse) through supernova neutrino
oscillations.


title: The Colour Glass Condensate: An Introduction

abstract:
  In these lectures, we develop the theory of the Colour Glass Condensate. This
is the matter made of gluons in the high density environment characteristic of
deep inelastic scattering or hadron-hadron collisions at very high energy. The
lectures are self contained and comprehensive. They start with a
phenomenological introduction, develop the theory of classical gluon fields
appropriate for the Colour Glass, and end with a derivation and discussion of
the renormalization group equations which determine this effective theory.


title:
Supersymmetric Regularization, Two-Loop QCD Amplitudes and Coupling
  Shifts

abstract:
  We present a definition of the four-dimensional helicity (FDH) regularization
scheme valid for two or more loops. This scheme was previously defined and
utilized at one loop. It amounts to a variation on the standard 't
Hooft-Veltman scheme and is designed to be compatible with the use of helicity
states for "observed" particles. It is similar to dimensional reduction in that
it maintains an equal number of bosonic and fermionic states, as required for
preserving supersymmetry. Supersymmetry Ward identities relate different
helicity amplitudes in supersymmetric theories. As a check that the FDH scheme
preserves supersymmetry, at least through two loops, we explicitly verify a
number of these identities for gluon-gluon scattering (gg to gg) in
supersymmetric QCD. These results also cross-check recent non-trivial two-loop
calculations in ordinary QCD. Finally, we compute the two-loop shift between
the FDH coupling and the standard MS-bar coupling, alpha_s. The FDH shift is
identical to the one for dimensional reduction. The two-loop coupling shifts
are then used to obtain the three-loop QCD beta function in the FDH and
dimensional reduction schemes.


title:
Weak Scale Quantum Gravity Effects for $\gamma\gamma\to ZZ$ in the TeV
  region

abstract:
  We consider the effect of massive spin-2 gravitons that occur as Kaluza-Klein
excitations of the graviton in a Weak scale Quantum Gravity scenario on the
process $\gamma \gamma \to ZZ$, which in the Standard Model can proceed through
loop diagrams. For a wide range of parameters, we show that the massive
gravitons leave behind signatures that should be verifiable in a TeV scale
scattering experiment.


title:
Nucleon electromagnetic form factors in a single-time constituent quark
  model

abstract:
  The main statement of the nucleon constituent quark model with a fixed number
of particles as basic ansatz are considered in a framework of the single-time
(quasipotential) approach to the bound state problem. The scaling law breacking
for the proton form factor is investigated for Q^2 = 0 -- 2 Gev^2.


title:
How one can estimate relativistic contribution into nucleon observables
  in the relativistic constituent quark model

abstract:
  A nonrelativistic decomposition for the quark energy by the ratio of the
dispersion of quark momentum squared and the effective quark mass is
investigated in the framework of the relativistic oscillator constituent quark
model as bound systems of three valence quarks. It is shown that relativistic
corrections are defined by dispersion of the squared absolute value of the
quark momentum. The variations of the quark mass and oscillator parameter are
studied in detail both in the spectrum and in the nucleon magnetic moments.


title: Theoretical Status of Muon (g-2)

abstract:
  The theoretical status of the muon anomaly is reviewed including the recent
change in the light by light hadronic correction. Specific attention is given
to the implications of the shift in the difference between the BNL experimental
result and the standard model prediction for sparticle mass limits. The
implication of the BNL data for Yukawa unification is discussed and the role of
gaugino mass nonuniversalities in the satisfaction of Yukawa unification is
explored. An analysis of the BNL constraint for the satisfaction of the relic
density constraint and for the search for dark matter is also given.


title:
Effect of Matter Motion and Polarization in Neutrino Flavour
  Oscillations

abstract:
  The Lorentz invariant formalism for description of neutrino flavor
oscillation in moving and polarized matter is developed. It is shown that the
neutrino effective potential, which determines the effective mass difference
between neutrinos in matter can be sufficiently changed by relativistic motion
of matter. In the case of matter motion parallel to neutrino propagation,
matter effects in neutrino flavor oscillations are suppressed. In the case of
relativistic motion of matter in the opposite direction sufficient increase of
effects of matter in neutrino oscillations is predicted. The dependence of the
matter term in neutrino effective potential on the values and correlations of
the three vectors, the neutrino and matter speeds and matter polarization, is
discussed in details.


title: Triangular and Y-shaped hadrons in QCD

abstract:
  Gauge invariant extended configurations are considered for the three
fundamental (quarks) or adjoint (gluons) particles. For quarks it is shown that
the Y-shaped configuration is the only possible. For adjoint sources both the
Y-shaped and triangular configurations may realize. The corresponding static
potentials are calculated in the Method of Field Correlators and in the case of
baryon shown to be consistent with the lattice simulations. For adjoint sources
the potentials of Y-shaped and Delta-shaped configurations turn out to be close
to each other, which leads to almost degenerate masses of 3-- 3g glueballs and
odderon trajectories.


title:
Intermediate Symmetries in the Spontaneous Breaking of Supersymmetric
  SO(10)

abstract:
  We study the supersymmetric spontaneous symmetry breaking of SO(10) into
SU(3)xSU(2)xU(1) for the most physically interesting cases of SU(5) or flipped
SU(5)xU(1) intermediate symmetries. The first case is more easily realized
while the second one requires a fine-tuning condition on the parameters of the
superpotential. This is because in the case of SU(5) symmetry there is at most
one singlet of the residual symmetry in each SO(10) irreducible representation.
We also point out on more general grounds in supersymmetric GUT's that some
intermediate symmetries can be exactly realized and others can only be
approximated by fine-tuning. In the first category, there could occur some
tunneling between the vacua with exact and approximate intermediate symmetry.
The flipped SU(5)xU(1) symmetry improves the unification of gauge couplings if
(B-L) is broken by (B-L)=1 scalars yielding right handed neutrino masses below
10^{14} GeV}.


title: Predictions for deeply virtual Compton scattering on a spin-one target

abstract:
  We consider hard leptoproduction of a photon on a spin-one target and give
the general azimuthal angular dependence of the differential cross section.
Furthermore, we estimate the beam spin asymmetry for an unpolarized deuteron
target at HERMES.


title: A Half-Composite Standard Model at a TeV and Sin^2 theta_W

abstract:
  We apply a recently proposed mechanism -- in which an SU(3) symmetry predicts
the weak mixing angle -- to construct realistic theories with composite quarks
and leptons at a TeV. Although the models are strongly coupled, they are
reliably analyzed using complementarity and 't Hooft's anomaly matching. In the
simplest models the right-handed fermions are composite, while the left-handed
are elementary. Strong SU(2)_R forces give rise to 12-particle
instanton-mediated processes. They violate baryon and lepton numbers by three
units and result in spectacular multilepton and multijet events at the LHC.
Models in which the leptons are in an SU(3)-triplet can be directly tested in
muonium-antimuonium conversion experiments.


title:
Future determination of the neutrino-nucleon cross section at extreme
  energies

abstract:
  Future detectors of cosmic rays, such as EUSO and OWL, can test the Standard
Model predictions for the neutrino interactions at energies well beyond the
reach of any terrestrial experiment. The relative rates of horizontal and
upgoing air showers, combined with the angular distribution of upgoing air
showers will allow one to measure the neutrino-nucleon cross section at
center-of-mass energy 10^5 GeV or higher.


title: Analysis of $B\to K^* \ell^+ \ell^-$ decays at large recoil

abstract:
  We study the exclusive decays of $B\to K^{*}\ell^+ \ell^-$ within the
framework of the perturbative QCD (PQCD). We obtain the form factors for the
$B\to K^{*}$ transition in the large recoil region, where the PQCD for heavy
$B$ meson decays is reliable. We find that our results for the form factors at
$q^2=0$ are consistent with those from most of the other QCD models in the
literature. Via the decay chain of $B\to K^* (K\pi) \ell^+ \ell^-$, we obtain
many physical observables related to the different helicity combinations of
$B\to K^* \ell^+ \ell^-$. In particular, we point out that the T violating
effect suppressed in the standard model can be up to $O(10%)$ in some CP
violating models with new physics.


title:
Extraction of the CKM angle $\gamma$ from the new "mixed " system of
  $B^+ \to \pi^+ K^0$ and $B_d^0 \to \pi^0 K^0$ decays

abstract:
  In this paper we try to extract the CKM angle $\gamma$ from the new "mixed"
system of $B^+ \to \pi^+ K^0$ and $B_d^0 \to \pi^0 K^0$ decays. We also made an
update for the constraints on the angle $\gamma$ from the observables $R$ and
$A_0$. In the parametrization, the SU(2) isospin symmetry of strong
interactions has been applied. We found the following results: (a) the measured
value of $R$ is now very close to unit, the bound on the angle $\gamma$ from
the measurement of $R$ is therefore not as promising as before, but some bounds
on $\gamma$ can still be read off from $r-\gamma$ plane if $r$ could be fixed
by using an additional input; (b) the measured $R_1$ implies a limit on the
strong phase $\Delta_1$; (c) due to the contribution from the color allowed
electroweak penguin, the minimal value of $R_1$ can be larger than unit. For
$\epsilon_1=0.2$ and $R_1=1.2$, the range of $65^\circ \leq \gamma \leq
115^\circ$ will be excluded, such bounds on $\gamma$ are interesting and
complimentary to the limits from global fit; (d) the dependences of extraction
of $\gamma$ on the variation of parameters $\epsilon_1$, $\rho$, $r_1$ and
strong phases are also studied.


title: The Proton Spin Problem in the Chiral Bag Model

abstract:
  The flavor singlet axial charge has been a source of study in the last years
due to its relation to the so called {\it Proton Spin Problem}. The relevant
flavor singlet axial current is anomalous, i.e., its divergence contains a
piece which is the celebrated $U_A(1)$ anomaly. This anomaly is intimately
associated with the $\eta^\prime$ meson, which gets its mass from it. When the
gauge degrees of freedom of QCD are confined within a volume as is presently
understood, the $U_A(1)$ anomaly is known to induce color anomaly leading to
"leakage" of the color out of the confined volume (or bag). For consistency of
the theory, this anomaly should be cancelled by a boundary term. This ``color
boundary term" inherits part or most of the dynamics of the volume (i.e., QCD).
In this thesis, we exploit this mapping of the volume to the surface via the
color boundary condition to perform a complete analysis of the flavor singlet
axial charge in the chiral bag model using the Cheshire Cat Principle. This
enables us to obtain the hitherto missing piece in the axial charge associated
with the gluon Casimir effect. The result is that the flavor singlet axial
charge is small independent of the confinement (bag) size ranging from the
skyrmion picture to the MIT bag picture, thereby confirming the (albeit
approximate) Cheshire Cat phenomenon.


title:
Constraining the variation of the coupling constants with big bang
  nucleosynthesis

abstract:
  We consider the possibility of the coupling constants of the $SU(3)\times
SU(2)\times U(1)$ gauge interactions at the time of big bang nucleosynthesis
having taken different values from what we measure at present, and investigate
the allowed difference requiring the shift in the coupling constants not
violate the successful calculation of the primordial abundances of the light
elements. We vary gauge couplings and Yukawa couplings (fermion masses) using a
model in which their relative variations are governed by a single scalar field,
dilaton, as found in string theory. The results include a limit on the fine
structure constant
$-6.0\times10^{-4}<\Delta\alpha_{EM}/\alpha_{EM}<1.5\times10^{-4}$, which is
two orders stricter than the limit obtained by considering the variation of
$\alpha_{EM}$ alone.


title:
Verification of CPT-invariance of QED bound states for the production of
  muonium or antimuonium in scattering of electrons or positrons by nuclei

abstract:
  A possibility of a verification of CPT-invariance of QED for bound states by
example of muonium or antimuonium produced in reactions of scattering of
electrons or positrons by nuclei is considered. The number of events of the
muonium production is estimated for contemporary accelerators. The method of
the detection of muonium by measuring of oscillations of the decay curve caused
by the interference between the ground and excited state of muonium is
suggested. The admixture of the excited muonium to the final state is
calculated.


title:
Renormalization in Self-Consistent Approximation schemes at Finite
  Temperature III: Global Symmetries

abstract:
  We investigate the symmetry properties for Baym's $\Phi$-derivable schemes.
We show that in general the solutions of the dynamical equations of motion,
derived from approximations of the $\Phi$-functional, do not fulfill the
Ward-Takahashi identities of the symmetry of the underlying classical action,
although the conservation laws for the expectation values of the corresponding
Noether currents are fulfilled exactly for the approximation. Further we prove
that one can define an effective action functional in terms of the
self-consistent propagators which is invariant under the operation of the same
symmetry group representation as the classical action. The requirements for
this theorem to hold true are the same as for perturbative approximations: The
symmetry has to be realized linearly on the fields and it must be free of
anomalies, i.e., there should exist a symmetry conserving regularization
scheme. In addition, if the theory is renormalizable in Dyson's narrow sense,
it can be renormalized with counter terms which do not violate the symmetry.


title: Accounting for coherence in interjet E_t flow: a case study

abstract:
  Recently, interest has developed in the distribution of interjet energy
flows, with for example the leading-log calculation of the highly non-trivial
colour structure of primary emissions in 4-jet systems. Here we point out
however that at leading-log level it is insufficient to consider only multiple
primary emission from the underlying hard antenna -- additionally, one must
take into account the coherent structure of emission from arbitrarily
complicated ensembles of large-angle soft gluons. Similar considerations apply
to certain definitions of rapidity gaps based on energy flow. We examine this
new class of terms in the simpler context of 2-jet events, and discover
features that point at novel aspects of the QCD dynamics.


title: Charge Asymmetry in the Brane World and Formation of Charged Black Holes

abstract:
  In theories with an infinite extra dimension, free particles localized on the
brane can leak out to the extra space. We argue that if there were color
confinement in the bulk, electrons would be more able to escape than quarks and
than protons (which are composed states). Thus, this process generates an
electric charge asymmetry on brane matter densities. A primordial charge
asymmetry during Big Bang Nucleosynthesis era is predicted. We use current
bounds on this and on electron disappearance to constrain the parameter space
of these models. Although the generated asymmetry is generically small, it
could be particularly enhanced on large densities as in astrophysical objects,
like massive stars. We suggest the possibility that such accumulation of charge
may be linked, upon supernova collapse, to the formation of a charged Black
Hole and the generation of Gamma-Ray Bursts.


title: The Nucleon's Mirror Image: Revealing the Strange and Unexpected

abstract:
  A remarkably successful program of parity-violating electron scattering
experiments is providing new insight into the structure of the nucleon.
Measurement of the vector form factors enables a definitive study of potential
strange quark-antiquark contributions to the electromagnetic structure such as
the magnetic moment and charge distribution. Recent experimental results have
already indicated that effects of strangeness are much smaller than
theoretically expected. In addition, the neutral axial form factor appears to
display substantial corrections as one might expect from an anapole effect.


title: Elusive vector glueball

abstract:
  If the vector glueball exists in the mass range that theory suggests, its
resonance production cross section can be seen in e+e- annihilation only if the
decay width is very narrow (< a few MeV). Otherwise it willbe observed only
indirectly through its mixing with psi(2S). A few tests of the glueball-psi'
mixing are proposed for future charm factories.


title: Energy dependence of CNI analyzing power for proton-carbon scattering

abstract:
  We use a simple Regge model to determine the energy dependence of the
analyzing power for pC scattering in the CNI region. We take the model of
Cudell et al which determines the Regge couplings and intercepts for the I=0,
non-flip Regge exchanges (Pomeron, f1 and \omega) and extend it to the
spin-flip amplitudes by allowing each of these exchanges to have independent
spin-flip factors tau_P, tau_f and tau_\omega. Using this we show that by
making measurments at two separate energies, with polarization known at one
energy, one can fix the ratios of the analyzing power at any energy. By making
an additional assumption that is reasonable, but not necessarily true, namely
tau_\omega=tau_f, we show that one can predict the energy dependence of the
analyzing power {using the existing E950 data}. We present the corresponding
predictions for beam energies of 100 GeV and 250 GeV protons on a fixed carbon
target based on a fit to the Spin 2000 data. Finally, we discuss the relation
of these results to the pp CNI analyzing power.


title:
An approach to solve Slavnov-Taylor identities in nonsupersymmetric
  non-Abelian gauge theories

abstract:
  We present a way to solve Slavnov--Taylor identities in a general
nonsupersymmetric theory. The solution can be parametrized by a limited number
of functions of spacetime coordinates, so that all the effective fields are
dressed by these functions via integral convolution. The solution restricts the
ghost part of the effective action and gives predictions for the physical part
of the effective action.


title:
Kaon-nucleon and D-nucleon scattering in the quark model, including
  spin-orbit interactions

abstract:
  Interactions of charmed and strange mesons with baryonic matter can be
calculated in the nonrelativistic quark potential model. For KN scattering data
exists, and the theoretical results for S-waves are in approximate agreement
with experiment. Here we apply the same model to the scattering of open-charm
(D) mesons by nucleons, and give quark model predictions for DN scattering
amplitudes. Spin-orbit forces in KN and DN will also be discussed.


title:
Gauge Dependence of Mass and Condensate in Chirally Asymmetric Phase of
  Quenched QED3

abstract:
  We study three dimensional quenched Quantum Electrodynamics in the bare
vertex approximation. We investigate the gauge dependence of the dynamically
generated Euclidean mass of the fermion and the chiral condensate for a wide
range of values of the covariant gauge parameter $\xi$. We find that (i) away
from $\xi=0$, gauge dependence of the said quantities is considerably reduced
without resorting to sophisticated vertex {\em ansatze}, (ii) wavefunction
renormalization plays an important role in restoring gauge invariance and (iii)
the Ward-Green-Takahashi identity seems to increase the gauge dependence when
used in conjunction with some simplifying assumptions. In the Landau gauge, we
also verify that our results are in agreement with those based upon dimensional
regularization scheme within the numerical accuracy available.


title:
Octet magnetic moments and the violation of CGSR in $\chi$QM with
  configuration mixing

abstract:
  Octet baryon magnetic moments are calculated within \chiQM, respecting color
spin spin forces (Szczepaniak et al., PRL 87, 072001(2001)), incorporating the
orbital angular momentum as well as the quark sea contribution through the
Cheng and Li mechanism (PRL 80, 2789(1998)). Using configuration mixing
generated by color spin spin forces as well as the concept of ``effective''
quark mass to include the effects of confinement, we are able to get an
excellent fit to the octet magnetic moments as well as the violation of Coleman
Glashow Sum Rule (CGSR) without any further input except for the ones already
used in \chiQM as well as in NRQM. Specifically, in the case of p, \Sigma^+,
\Xi^o, and violation of CGSR we get a perfect fit whereas in almost all the
other cases the results are within 5% of the data.


title: The s-d Transition in Heavy Mesons

abstract:
  A class of $|\Delta s|=1$ transition is analyzed in the $D_s^+-D^+$ and $\bar
B_s^0-\bar B^0$ systems. Short distance Wilson coefficients are calculated
within HQET. Novel features of the transitions are discussed. We find that
these transitions are unobservable in the standard model.


title:
The $f_0$ Mesons in Processes $\pi\pi\to\pi\pi, K\bar{K}$ and Chiral
  Symmetry

abstract:
  In a combined analysis of the experimental data on the coupled processes
$\pi\pi\to\pi\pi,K\bar{K}$ in the channel with $I^GJ^{PC}=0^+0^{++}$, the
following results are obtained in a model-independent way: 1) The $f_0(665)$
state with properties of the $\sigma$-meson is proved to exist; 2) it is shown
that the ${f_0}(980)$ and especially ${f_0}(1370)$ (if exists) have a dominant
$s{\bar s}$ component; 3) indications of the glueball nature of the $f_0(1500)$
and of a considerable $s{\bar s}$ component in the ${f_0}(1710)$ are obtained;
4) conclusion on the linear realization of chiral symmetry is drawn.


title:
Spin waves in the magnetized plasma of a supernova and its excitation by
  neutrino fluxes

abstract:
  The spin effects on electromagnetic waves in a strongly magnetized plasma
with rare collisions is considered with the help of relativistic kinetic
equations, which takes into account the electron spin dynamics in the
selfconsistent electric and magnetic fields. It is shown that for
electromagnetic waves propagating almost perpendicular to ambient magnetic
field the spin effects become essential in the vicinity of electron
gyrofrequency and the corresponding wave dispersion and growth rate of the
electromagnetic spin waves in the presence of intense quasi monoenergetic
fluxes of neutrino is determined.


title:
Neutrino Matter Effect Invariants and the Observables of Neutrino
  Oscillations

abstract:
  We generalise our previous observation on the invariance of the Jarlskog
determinant to matter effects in neutrino oscillations. Within the context of
standard neutrino oscillation theory with matter effects, we present the
complete set of (five) matter invariant observables for neutrino propagation in
matter. We give some examples of their application.


title: Vector and axial vector mesons at finite temperature

abstract:
  We consider the thermal correlation functions of vector and axial-vector
currents and evaluate corrections to the vector and axial-vector meson pole
terms to one loop in chiral perturbation theory. As expected, the pole
positions do not shift to leading order in temperature. But the residues
decrease with temperature.


title: Simple Quark Model with Chiral Phenomenology

abstract:
  We propose a new approach to the determination of hadronic observables in
which the essential features of chiral symmetry are combined with conventional
constituent quark models. To illustrate the approach, we consider the simple
quark model in the limit of SU(3) flavour symmetry at the strange quark mass.
The comparison with data is made after an analytic continuation which ensures
the correct leading nonanalytic behaviour of chiral perturbation theory. The
approach not only gives an excellent fit for the octet baryon magnetic moments
but the prediction for the $\Delta^{++}$ magnetic moment is also in good
agreement with current measurements.


title: Multiparticle production and quantum chromodynamics

abstract:
  The theory of strong interactions, quantum chromodynamics (QCD), is quite
successful in the prediction and description of main features of multiparticle
production processes at high energies. The general perturbative QCD approach to
these processes (mainly to e+e- -annihilation) is briefly formulated and its
problems are discussed. It is shown that the analytical calculations at the
parton level with the low-momentum cut-off reproduce experimental data on the
hadronic final state in multiparticle production processes at high energies
surprisingly accurately even though the perturbative expansion parameter is not
very small. Moreover, it is important that the perturbative QCD has been able
not only to describe the existing data but also to predict many bright
qualitatively new phenomena.


title:
A phenomenological interpretation of open charm production at HERA in
  terms of the semi-hard approach

abstract:
  In the framework of the semi-hard (k_t-factorization) approach, we analyze
the various charm production processes in the kinematic region covered by the
HERA experiments.


title: Sweeping the Space of Admissible Quark Mass Matrices

abstract:
  We propose a new and efficient method of reconstructing quark mass matrices
from their eigenvalues and a complete set of mixing observables. By a
combination of the principle of NNI (nearest neighbour interaction) bases which
are known to cover the general case, and of the polar decomposition theorem
that allows to convert arbitrary nonsingular matrices to triangular form, we
achieve a parameterization where the remaining freedom is reduced to one
complex parameter. While this parameter runs through the domain bounded by a
circle with radius R determined by the up-quark masses around the origin in the
complex plane one sweeps the space of all mass matrices compatible with the
given set of data.


title:
Supergraph Techniques and Two-Loop Beta-Functions for Renormalizable and
  Non-Renormalizable Operators

abstract:
  We present a construction kit for calculating two-loop beta functions in N=1
supersymmetric theories for the operators of the superpotential using
supergraph techniques. In particular, it allows to compute the beta functions
for every desired, even higher dimensional, operator of the superpotential from
the wavefunction renormalization constants of the theory. We apply this method
to calculate the two-loop beta functions for the lowest-dimensional effective
neutrino mass operator in the Minimal Supersymmetric Standard Model (MSSM) and
for the Yukawa couplings in the MSSM extended by singlet superfields and the
mass matrix for the latter. Our method can be applied to any N=1 supersymmetric
theory.


title: The longitudinal structure function of the proton for small x

abstract:
  A comparison of the H1 data on the longitudinal structure function, $F_L$, at
small $x$ with the predictions from the generalized vector dominance / color
dipole picture (GVD/CDP) is presented. Using the set of parameters previously
determined in the fits to the total cross section, $\sigma_{\gamma^* p}$, we
find good agreement with the data for $F_L$. Scaling in $\eta = (Q^2 + m^2_0) /
\Lambda^2 (W^2)$ is discussed in detail for the longitudinal and transverse
photoabsorption cross sections.


title:
Neutrino Counting, NuTeV Measurements, Higgs Mass and V_{us} as Probes
  of Vectorlike Families in ESSM/SO(10)

abstract:
  The Extended Supersymmetric Standard Model (ESSM), motivated on several
grounds, introduces two vector-like families [16+ 16-bar of SO(10)] with masses
of order one TeV. In an earlier work, a successful pattern for fermion masses
and mixings (to be called pattern I) has been proposed within a unified
SO(10)-framework, based on MSSM, which makes seven predictions, in good accord
with observations, including V_{cb} ~ 0.04, and \sin^22\theta_{\nu_\mu\nu_\tau}
\~ 1. To exibit new phenomenological possibilities which may arise within ESSM,
we present here a variant pattern (to be called pattern II) for fermion masses
and mixings, within the SO(10)/ESSM framework, which possesses the same degree
of success as pattern I as regards the masses and mixings of all fermions
including neutrinos. The main point of this paper is to first note that either
one of these two patterns, embedded in ESSM, would lead to a reduction in the
LEP neutrino-counting from N_\nu = 3 (in good agreement with the data) and also
provide a simple explanation of the (g-2)_\mu-anomaly, as pointed out in the
accompanying paper. They can, however, be distinguished from each other by (a)
a sharpening of our understanding of the true magnitude of the anomaly in
\nu_\mu-nucleon scattering, recently reported by the NuTeV group, (b) improved
measurements of m_t, m_H and m_W, (c) improved tests of e-\mu
lepton-universality in charged current processes, and (d) improvements in the
measurements of V_{ud} and V_{us}. Pattern II (extended to ESSM) would predict
departures from the standard model in the right direction with regard to (a)
and (b), though not as regards (c) and (d) while Pattern I practically would
coincide with the standard model as regards its predictions for all four
features: (a)-(d).


title: Geometric scaling and QCD evolution

abstract:
  We study the impact of the QCD DGLAP evolution on the geometric scaling of
the gluon distributions which is expected to hold at small x within the
saturation models. To this aim we solve the DGLAP evolution equations with the
initial conditions provided along the critical line Q^2=Q_s^2(x) where Q_s^2(x)
= Q_0^2 x^{-\lambda}and satisfying geometric scaling. Both fixed and running
coupling cases are studied. We show that in the fixed coupling case the
geometric scaling at low x is stable against the DGLAP evolution for
sufficiently large values of the parameter \lambda and in the double
logarithmic approximation of the DGLAP evolution this happens for \lambda >
4N_c\alpha_s/\pi. In the running coupling case geometric scaling is found to be
approximately preserved at very small x. The residual geometric scaling
violation in this case can be approximately factored out and the corresponding
form-factor controlling this violation is found.


title:
Prospects for heavy supersymmetric charged Higgs boson searches at
  hadron colliders

abstract:
  We investigate the production of a heavy charged Higgs boson at hadron
colliders within the context of the MSSM. A detailed study is performed for all
important production modes and basic background processes for the
t\bar{t}b\bar{b} signature. In our analysis we include effects of initial and
final state showering, hadronization, and principal detector effects. For the
signal production rate we include the leading SUSY quantum effects at high
\tan\beta>~ mt/mb. Based on the obtained efficiencies for the signal and
background we estimate the discovery and exclusion mass limits of the charged
Higgs boson at high values of \tan\beta. At the upgraded Tevatron the discovery
of a heavy charged Higgs boson (MH^+ >~ 200 GeV) is impossible for the
tree-level cross-section values. However, if QCD and SUSY effects happen to
reinforce mutually, there are indeed regions of the MSSM parameter space which
could provide 3\sigma evidence and, at best, 5\sigma charged Higgs boson
discovery at the Tevatron for masses M_H^+<~ 300 GeV and M_H^+<~ 250 GeV,
respectively, even assuming squark and gluino masses in the (500-1000) GeV
range. On the other hand, at the LHC one can discover a H^+ as heavy as 1 TeV
at the canonical confidence level of 5\sigma; or else exclude its existence at
95% C.L. up to masses ~ 1.5 TeV. Again the presence of SUSY quantum effects can
be very important here as they may shift the LHC limits by a few hundred GeV.


title:
Electroweak Constraints on Minimal Higher-Dimensional Extensions of the
  Standard Model

abstract:
  We derive electroweak constraints on the compactification scale of minimal
5-dimensional extensions of the Standard Model, in which all or only some of
the SU(2)$_L$ and U(1)$_Y$ gauge fields and Higgs bosons feel the presence of
the fifth dimension. In our analysis, we assume that the fermions are always
localized on a 3-brane. In this context, we also present the consistent
quantization procedure of the higher-dimensional models in the generalized
$R_\xi$ gauge. We find that the usually derived lower bound of $\sim 4$ TeV on
the compactification scale may be significantly lowered to $\sim 3$ TeV if the
SU(2)$_L$ gauge boson is the only particle that propagates in all 5 dimensions.


title: Soft electroweak breaking from hard supersymmetry breaking

abstract:
  We present a class of four-dimensional models, with a non-supersymmetric
spectrum, in which the radiative corrections to the Higgs mass are not
sensitive, at least at one-loop, to the UV completion of the theory. At one
loop, Yukawa interactions of the top quark contribute to a finite and negative
Higgs squared mass which triggers the electroweak symmetry breaking, as in
softly broken supersymmetric theories, while gauge interactions lead to a
logarithmic cutoff dependent correction that can remain subdominant. Our
construction relies on a hard supersymmetry breaking localized in the theory
space of deconstruction models and predicts, within a renormalizable setup,
analogous physics as five-dimensional scenarios of Scherk-Schwarz supersymmetry
breaking. The electroweak symmetry breaking can be calculated in terms of the
deconstruction scale, replication number, top-quark mass and electroweak gauge
couplings. For m_top ~ 170 Gev, the Higgs mass varies from 158 GeV for N=2 to
178 GeV for N=10.


title:
The Effective Lagrangian in the Randall-Sundrum Model and Electroweak
  Physics

abstract:
  We consider the two-brane Randall-Sundrum (RS) model with bulk gauge fields.
We carefully match the bulk theory to a 4D low-energy effective Lagrangian. In
addition to the four-fermion operators induced by KK exchange we find that
large negative S and T parameters are induced in the effective theory. This is
a tree-level effect and is a consequence of the shapes of the W and Z wave
functions in the bulk. Such effects are generic in extra dimensional theories
where the standard model (SM) gauge bosons have non-uniform wave functions
along the extra dimension. The corrections to precision electroweak observables
in the RS model are mostly dominated by S. We fit the parameters of the RS
model to the experimental data and find somewhat stronger bounds than
previously obtained; however, the standard model bound on the Higgs mass from
precision measurements can only be slightly relaxed in this theory.


title: Lattice QCD with Dynamical Quarks from the UKQCD Collaboration

abstract:
  A brief overview of the lattice technique of studying QCD is presented.
Recent results from the UKQCD Collaboration's simulations with dynamical quarks
are then presented. In this work, the calculations are all at a fixed lattice
spacing and volume, but varying sea quark mass from infinite (corresponding to
the quenched simulation) down to roughly that of the strange quark mass. The
main aim of this work is to uncover dynamical quark effects from these
``matched'' ensembles.


title: The $Z \to b \bar{b}$ Decay Asymmetry and Left-Right Models

abstract:
  It has been pointed out recently by Chanowitz that the $Z \to b\bar{b}$ decay
asymmetry poses a problem for the standard model whether it is genuine or not
[Chanowitz:2001bv]. If this conflict is interpreted as new physics in the
b-quark couplings, it suggests a rather large right handed coupling of the
b-quark to the Z-boson. We show that it is possible to accommodate this result
in left-right models that single out the third generation.


title: CP-Violation in Kaluza-Klein and Randall-Sundrum Theories

abstract:
  The Kaluza-Klein theory and Randall-Sundrum theory are examined
comparatively, with focus on the five dimensional (Dirac) fermion and the
dimensional reduction to four dimensions. They are treated in the Cartan
formalism. The chiral property, localization, anomaly phenomena are examined.
The electric and magnetic dipole moment terms naturally appear. The order
estimation of the couplings is done. This is a possible origin of the
CP-violation.


title:
The exclusive $B_s->\phi \ell^+ \ell^-$ decay in the two Higgs doublet
  models

abstract:
  We study the differential branching ratio, branching ratio and the
forward-backward asymmetry for the exclusive $B_s->\phi \ell^+ \ell^-$ decay in
the two Higgs doublet model. We analyze the dependencies of these quantities on
the model parameters and show that these observables are highly sensitive to
new physics and hence may provide powerful probe of the SM and beyond.


title: Dark matter in the Galaxy

abstract:
  After a brief introduction to standard cosmology and the dark matter problem
in the the Universe, we consider a self-gravitating noninteracting fermion gas
at nonzero temperature as a model for the dark matter halo of the Galaxy. This
fermion gas model is then shown to imply the existence of a supermassive
compact dark object at the Galactic center.


title:
Calculation of the Chiral Lagrangian Coefficients from the Underlying
  Theory of QCD: A Simple Approach

abstract:
  We calculate the coefficients in the chiral Lagrangian approximately from QCD
based on a previous study of deriving the chiral Lagrangian from the first
principles of QCD in which the chiral Lagrangian coefficients are defined in
terms of certain Green's functions in QCD. We first show that, in the large
N(c)-limit, the anomaly part contributions to the coefficients are exactly
cancelled by certain terms in the normal part contributions, and the final
results of the coefficients only concern the remaining normal part
contributions depending on QCD interactions. We then do the calculation in a
simple approach with the approximations of taking the large-N(c) limit, the
leading order in dynamical perturbation theory, and the improved ladder
approximation, thereby the relevant Green's functions are expressed in terms of
the quark self energy. By solving the Schwinger-Dyson equation for the quark
self energy, we obtain the approximate QCD predicted coefficients and the quark
condensate which are consistent with the experimental values.


title:
Lepton polarization asymmetry in radiative dileptonic B-meson decays in
  MSSM

abstract:
  In this paper we study the polarization asymmetries of the final state lepton
in the radiative dileptonic decay of B meson (\bsllg) in the framework of
Minimal Supersymmetric Standard Model (MSSM) and various other unified models
within the framework of MSSM e.g. mSUGRA, SUGRA (where condition of
universality of scalar masses is relaxed) etc. Lepton polarization, in addition
of having a longitudinal component (\pl), can have two other components, \pt
and \pn, lying in and perpendicular to the decay plane, which are proportional
to \ml and hence are significant for final state being $\mu^+ ~ \mu^-$ or
$\tau^+ \~\tau^-$. We analyse the dependence of these polarization asymmetries
on the parameters of the various models.


title: Once more on mixing of the a_0(980) and f_0(980) mesons

abstract:
  We show that a recent proposal by Close and Kirk fails to describe a_0(980)
and f_0(980) mixing when physical masses and widths are included.


title: Tests of CPT invariance for neutral-flavoured-meson--antimeson mixing

abstract:
  We focus on two aspects of CPT invariance in neutral-meson--antimeson ($M^0
\bar M^0$) mixing: 1. Tests of CPT invariance, using only the property of
``lack of vacuum regeneration'', which occurs as a part of the well-known
Lee--Oehme--Yang (LOY) theory; 2. Methods for extracting the CPT-violating
mixing parameter $\theta$ through explicit calculations by using the LOY-type
theory fully. In the latter context, we demonstrate the importance of the
C-even $| M^0 \bar M^0>$ state. In particular, by measuring the time dependence
of opposite-sign dilepton events arising from decays of the C-even and C-odd $|
M^0 \bar M^0>$ states, $\theta$ may be disentangled from the parameters
$\lambda_+$ and $\bar \lambda_-$ characterizing violations of the $\Delta F =
\Delta Q$ rule. Furthermore, these two parameters may also be determined. The
same is true if one uses like-sign dilepton events arising from only the C-even
$| M^0 \bar M^0>$ state.


title: T-odd correlations in charged Kl4 decays

abstract:
  We analyse the sensitivity to physics beyond the SM of T-odd correlations in
$K_{\ell 4}$ decays, which do not involve the lepton polarization. We show that
a combined analysis of $K^+_{\mu 4}$ and $K^-_{\mu 4}$ decays can lead to new
constraints about CP violation in $\Delta S=1$ charged-current interactions,
complementary to those obtained from the transverse muon polarization in
$K_{\mu 3}$ and of comparable accuracy.


title:
New physics effects in (Lambda_b -> Lambda l^+ l^-) decay with lepton
  polarizations

abstract:
  We study lepton polarization asymmetries in the (Lambda_b -> Lambda l^+ l^-)
decay using the most general model independent effective Hamiltonian. The
dependence of the lepton polarizations and their combinations on the new Wilson
coefficients are studied in detail. It is observed that there is a region for
the new Wilson coefficients for which the branching ratio coincides with the
standard model prediction, while lepton polarizations show considerable
departure from standard model.


title:
Lattice measurements of nonlocal quark condensates, vacuum correlation
  length, and pion distribution amplitude in QCD

abstract:
  Recent data of lattice measurements of the gauge-invariant nonlocal scalar
quark condensates are analyzed to extract the short--distance correlation
length, 1/\lambda_q, and to construct an admissible Ansatz for the condensate
behaviour in a coordinate space. The correlation length values for both the
quenched and full-QCD cases appear in a good agreement with the well-known QCD
SR estimates of the mixed quark-gluon condensate,
  2 \lambda_q^2 = <\bar{q}(ig\sigma^{\mu\nu}G_{\mu\nu})q>/<\bar{q}q>
  = 0.8 - 1.1 GeV^2. We test two different Ansatzes for a nonlocal quark
condensate and trace their influence on the twist-2 pion distribution amplitude
by means of QCD SRs. The main features of the pion distribution amplitude are
confirmed by the CLEO experimental results.


title: Charge fluctuations in a quark-antiquark system

abstract:
  It is pointed out that the recent data on charge fluctuations observed in
heavy ion collisions are compatible with production of a system of weakly
correlated constituent quarks and antiquarks.


title:
Leptonic $ \mu $- and $ \tau $-decays: mass effects, polarization
  effects and $ O(\alpha) $ radiative corrections

abstract:
  We calculate the radiative corrections to the unpolarized and the four
polarized spectrum and rate functions in the leptonic decay of a polarized $
\mu $ into a polarized electron. The new feature of our calculation is that we
keep the mass of the final state electron finite which is mandatory if one
wants to investigate the threshold region of the decay. Analytical results are
given for the energy spectrum and the polar angle distribution of the final
state electron whose longitudinal and transverse polarization is calculated. We
also provide analytical results on the integrated spectrum functions. We
analyze the $ m_e \to 0 $ limit of our general results and investigate the
quality of the $ m_e \to 0 $ approximation. In the $ m_e \to 0 $ case we
discuss in some detail the role of the $ O(\alpha) $ anomalous helicity flip
contribution of the final electron which survives the $ m_e \to 0 $ limit. The
results presented in this 0203048 also apply to the leptonic decays of
polarized $ \tau $-leptons for which we provide numerical results.


title: Pion and Kaon Electromagnetic Form Factors

abstract:
  We study the electromagnetic form factor of the pion and kaons at
low-energies with the use of Chiral Perturbation Theory. The analysis is
performed within the three flavour framework and at next-to-next-to-leading
order. We explain carefully all the relevant consistency checks on the
expressions, present full analytical results for the pion form factor and
describe all the assumptions in the analysis. From the phenomenological point
of view we make use of our expression and the available data to obtain the
charge radius of the pion obtaining $<r^2 >_V^\pi=(0.452+-0.013) fm^2$, as well
as the low-energy constant $L_9^r(m_\rho)= (5.93+-0.43)10^{-3}$. We also obtain
experimental values for 3 combinations of order $p^6$ constants.


title: Heavy quark production in photon-nucleon and photon-photon collisions

abstract:
  We discuss several mechanisms of heavy quark production in (real)
photon-nucleon and (real) photon - (real) photon collisions. In particular we
focuse on application of the Saturation Model. We discuss how to generalize the
formula from virtual photon - proton scattering and analyze threshold effects.
We discuss a possibility to measure the cross section for $\gamma \gamma \to 2
c 2 \bar c$. In addition to the main dipole-dipole contribution included in a
recent analysis, we propose how to calculate within the same formalism the
hadronic single-resolved contribution to heavy quark production. At high
energies this yields a sizeable correction of about 30-40 % for inclusive charm
production and 15-20 % for bottom production. We consider a subasymptotic
component to the dipole-dipole approach. We get a good description of recently
measured $\sigma(\gamma \gamma \to c \bar c X)$. Adding all possible
contributions to $e^+ e^- \to b \bar b X$ together removes a huge deficit
observed in earlier works but does not solve the problem totally. Whenever
possible, we compare the present approach to the standard collinear one. We
propose how to distinguish different mechanisms by measuring heavy
quark-antiquark correlations.


title: Zee model and Neutrinoless double beta decay

abstract:
  The original Zee model can easily accommodate a bi-maximal mixing solution
for the atmospheric and solar neutrino problems. From the most recent fit to
the data we obtain a set of parameters for the Zee model. However, the recent
claim on a positive signal observed in a neutrinoless double beta decay, which
requires a nonzero $m_{ee}$, cannot be accounted for by the Zee model. Based on
the observed neutrino mass-square differences and mixings, we derive a few
general patterns for the neutrino mass matrix in the flavor basis, which can
correctly describe the atmospheric, solar, and $0\nu\beta\beta$ data. Finally,
we investigate a few possible extensions to the Zee model, which can give the
required mass patterns.


title: Corrections to the fluxes of a Neutrino Factory

abstract:
  In view of their physics goals, future neutrino factories from muon decay aim
at an overall flux precision of ${\cal O}(1%)$ or better. We analytically study
the QED radiative corrections to the neutrino differential distributions from
muon decay. Kinematic uncertainties due to the divergence of the muon beam are
considered as well. The resulting corrections to the neutrino flux turn out to
be of order ${\cal O}(0.1%)$, safely below the required precision.


title: Probing High-Energy Physics with High-Precision QED Measurements

abstract:
  I summarize our self-contained determinations of the lowest order hadronic
contributions to the anomalous magnetic moments a_{\mu,\tau} of the muon and
tau leptons, the running QED coupling \alpha(M_Z) and the muonium hyperfine
splitting \nu. Using as a revised estimate of the light-by light scattering:
a_\mu(LL)=85(18) 10^{-11}, we deduce: a_\mu^{SM} = 116 591 861(78) 10^{-11},
a_\tau^{SM} = 117 759(7) 10^{-8}, giving: a_\mu^{SM}-a_\mu^{exp}=162(170)
10^{-11}. We also obtain: \alpha^{-1}(M_Z)=128.926(25) and the Fermi energy
splitting: \nu_F^{SM}=4 459 031 783(229) {Hz}. Lower bounds on some eventual
new physics are given, while \nu_F^{SM} leads e.g. to m_\mu/m_e=206.768 276(11)
in remarkable agreement with the data.


title:
Effect of possible stronger neutrino interaction at $E_{\nu_\mu}\sim
  10^{11}$ GeV upon the extraction of $\sin^2 \theta_W$ from the
  neutral-current cross section at NuTeV

abstract:
  The possibility exists that cosmic-ray neutrinos with energies of $\sim
10^{20}$ eV interact in the atmosphere with a cross section at the millibarn
level, giving rise to some of the highest-energy air showers. In a specific
dynamical model which can give rise to such a cross section, we show that there
can be a small effect upon the extraction of the effective value of $\sin^2
\theta_W$ from $\nu_\mu$-hadron, neutral-current cross section data at NuTeV.


title:
The double radiative annihilation of the heavy-light fermion bound
  states

abstract:
  We consider the double-radiative decays of heavy-light QED and QCD atoms,
$\mu^+ e^- \to \gamma\gamma$ and $\bar{B}^{0}_s \to \gamma\gamma$. Especially,
we take under scrutiny contributions coming from operators that vanish on the
free-quark mass shell. We show that by field redefinitions these operators are
converted into contact terms attached to the bound state dynamics. A net
off-shell contribution is suppressed with respect to the effect of the well
known flavour-changing magnetic-moment operator by the bound-state binding
factor. The negligible off-shellness of the weakly bound QED atoms becomes more
relevant for strongly bound QCD atoms. We analyze this off-shellness in
model-approaches to QCD, one of them enabling us to keep close contact to the
related effect in QED. We also comment on the off-shell effect in the
corresponding process $\bar{B}_d \to K^* \gamma$, and discuss possible
hindering of the claimed beyond-standard-model discovery in this decay mode.


title: The Higgs Working Group: Summary Report (2001)

abstract:
  Report of the Higgs working group for the Workshop `Physics at TeV
Colliders', Les Houches, France, 21 May - 1 June 2001. It contains 7 separate
sections: A. Theoretical Developments B. Higgs Searches at the Tevatron C.
Experimental Observation of an invisible Higgs Boson at LHC D. Search for the
Standard Model Higgs Boson using Vector Boson Fusion at the LHC E. Study of the
MSSM channel $A/H \to \tau \tau$ at the LHC F. Searching for Higgs Bosons in
$t\bar t H$ Production G. Studies of Charged Higgs Boson Signals for the
Tevatron and the LHC


title: Analytic Properties of Finite-Temperature Self-Energies

abstract:
  The analytic properties in the energy variable k_{0} of finite-temperature
self-energies are investigated. A typical branch cut results from n particles
being emitted into the heat bath and n' being absorbed from the heat bath.
There are three main results: First, in addition to the branch points at which
the cuts terminate, there are also branch points attached to the cuts along
their length. Second, branch points at k_{0}=\pm k are ubiquitous and for
massive particles they are essential singularities. Third, in a perturbative
expansion using free particle propagators or in a resummed expansion in which
the propagator pole occurs at a real energy, the self-energy will have a branch
point at the pole location.


title:
Comparison of theory with experiment for positron production from
  high-energy electrons moving along crystal axes

abstract:
  Various positron distributions are obtained using an approach developed
earlier for the description of electron-photon showers in axially aligned
single crystals. Based on these distributions, characteristics of the positron
yield measured in recent experiments are calculated. Theoretical estimations
display a rather good agreement with experimental results obtained using 3 to
10 GeV electrons aligned to the <111> - axis of the tungsten crystals.


title: Spin-dependent forces of quarks in baryon

abstract:
  Nonperturbative spin-dependent forces of quarks in a baryon are calculated
directly from the QCD Lagrangian in the framework of the Field Correlator
Method both for heavy and light quarks. Resulting forces contain terms of 5
different structures, only one being known before in asymptotic form.
Perturbative terms obtained by the same method are standard and have different
signs and structures with respect to the corresponding nonperturbative ones,
implying possible cancellations for some baryonic states.


title: Superluminal Paradox and Neutrino

abstract:
  Einstein's theory of special relativity(SR) and the principle of causality
imply that the speed of any moving object can not exceed that of light in a
vacuum($c$).However,there were many attempts in literature discussing the
particle moving with speed $u>c$(called as superluminal particle or
tachyon)either in the scheme of SR or beyond it.These theories all encountered
a series of insurmountable difficulties which will be named ``superluminal
paradox''in this paper.We will analyze it in some detail and then prove that
the paradox disappears unambiguously in quantum theory,which is compatible with
SR.Most likely,the superluminal particle in real world is just a kind of known
particle,the neutrino.


title:
CP violation in realistic String Models with family universal anomalous
  U(1)

abstract:
  The characteristic property of the Z2XZ2 orbifold compactification is the
cyclic permutation symmetry between the three twisted sectors. We discuss how
this property, which is retained in a class of realistic free fermionic string
models, may be instrumental in enabling fermion mass hierarchy while ensuring
sfermion mass degeneracy, irrespective of the dominant source of supersymmetry
breaking. The cyclic symmetry is reflected in some models in the existence of a
family universal anomalous U(1)_A. We analyze the FCNC and CP violation effects
in a model with a dominant U(1)_A SUSY breaking. In this theories, new sources
of FC are always suppressed with respect to the average sfermion masses. We
make a phenomenological analysis of these effects and find that in most of the
cases they are in qualitative agreement with the phenomenological limits. The
most sensitive low-energy observables to these new FC sources are the
$\epsilon_K$ parameter, measuring indirect CP violation in neutral kaon mixing
and EDMs. These observables set important constraints on the structure of the
sfermion mass matrices, but do not require a large fine-tuning of the initial
parameters and can be satisfied in most realistic constructions.


title: Q-ball formation in the wake of Hubble-induced radiative corrections

abstract:
  We discuss some interesting aspects of the $\rm Q$-ball formation during the
early oscillations of the flat directions. These oscillations are triggered by
the running of soft $({\rm mass})^2$ stemming from the nonzero energy density
of the Universe. However, this is quite different from the standard $\rm
Q$-ball formation. The running in presence of gauge and Yukawa couplings
becomes strong if $m_{1/2}/m_0$ is sufficiently large. Moreover, the $\rm
Q$-balls which are formed during the early oscillations constantly evolve, due
to the redshift of the Hubble-induced soft mass, until the low-energy
supersymmtery breaking becomes dominant. For smaller $m_{1/2}/m_0$, $\rm
Q$-balls are not formed during early oscillations because of the shrinking of
the instability band due to the Hubble expansion. In this case the $\rm
Q$-balls are formed only at the weak scale, but typically carry smaller
charges, as a result of their amplitude redshift. Therefore, the Hubble-induced
corrections to the flat directions give rise to a successful $\rm Q$-ball
cosmology.


title:
On the Determination of Spin-Dependent Parton Distributions in
  Semi-Inclusive Deep Inelastic Scattering

abstract:
  New polarized fragmentation functions are introduced and justified, in
addition to those conventional ones assumed to be independent of the helicity
of the parent parton. It is demonstrated that due to our present ignorance
concerning these new parton-spin dependent leading-twist fragmentation
functions, it is impossible to utilize current experiments on spin-dependent
semi-inclusive deep inelastic lepton nucleon scattering to disentangle the
separate polarized parton distributions.


title:
A next-to-leading order study of photon-pion and pion pair
  hadro-production in the light of the Higgs boson search at the LHC

abstract:
  We discuss the production of photon-pion and pion pairs with a large
invariant mass at collider energies. We present a study based on a perturbative
QCD calculation at full next-to-leading order accuracy, implemented in the
computer programme DIPHOX. We give estimations for various observables, which
concern the reducible background to the Higgs boson search in the channel H -->
gamma gamma, in the mass range 80-140 GeV at the LHC. We critically discuss the
reliability of these estimates due to our imperfect knowledge of fragmentation
functions at high z and a subtle interplay between higher order corrections and
realistic experimental cuts. We conclude that, whereas the invariant mass
spectrum of photon-pion pairs is theoretically better under control, in the
dipion case large uncertainties remain.


title:
Resonant and Non-Resonant Effects in Photon-Technipion Production at
  Lepton Colliders

abstract:
  Lepton collider experiments can search for light technipions in final states
made striking by the presence of an energetic photon: $e+e- \to
\photon\technipion$. To date, searches have focused on either production
through anomalous coupling of the technipions to electroweak gauge bosons or on
production through a technivector meson (\technirho, \techniomega) resonance.
This paper creates a combined framework in which both contributions are
included. This will allow stronger and more accurate limits on technipion
production to be set using existing data from LEP or future data from a
higher-energy linear collider. We provide explicit formulas and sample
calculations (analytic and Pythia) in the framework of the Technicolor Straw
Man Model, a model that includes light technihadrons.


title: The Phenomenology of Cosmological SUSY Breaking

abstract:
  We point out consequences of the assumption that supersymmetry breaking is of
cosmological origin.


title: The Higgs Boson Production Cross Section as a Precision Observable?

abstract:
  We investigate what can be learned at a linear collider about the sector of
electroweak symmetry breaking from a precise measurement of the Higgs boson
production cross section through the process e+e- -> hZ. We focus on deviations
from the Standard Model arising in its minimal supersymmetric extension. The
analysis is performed within two realistic future scenarios, taking into
account all prospective experimental errors on supersymmetric particle masses
as well as uncertainties from unknown higher order corrections. We find that
information on tan beta and M_A could be obtained from a cross section
measurement with a precision of 0.5 - 1 %. Alternatively, information could be
obtained on the gaugino mass parameters M_2 and mu if they are relatively
small, M_2, mu approximately 200 GeV.


title: Uniqueness of a recently proposed U(1) gauge extension

abstract:
  Consider the addition of a right-handed SU(2) fermion multiplet (with neither
color nor hypercharge) to each family of quarks and leptons. The resultant
theory admits a new U(1) gauge symmetry only if the additional multiplet is a
singlet $N_R$, which corresponds to the well-known case of $U(1)_{B-L}$, or a
triplet $(\Sigma^+, \Sigma^0, \Sigma^-)$, which corresponds to the proposal of
hep-ph/0112232. This disproves the assertion that the latter is somehow a
``trivial'' or ``expected'' discovery.


title:
Detection of B_s->mu mu at the Tevatron Run II and Constraints on the
  SUSY Parameter Space

abstract:
  A measurement of the branching ratio for the rare decay mode B_s->mu mu at
the Tevatron is an opportunity to test various supersymmetric scenarios. We
investigate the prospects for studying this mode in Run II and estimate that
CDF would be sensitive to this decay for a branching ratio > 1.2 \times 10^{-8}
with 15 \invfb (or, if a similar analysis holds for D0, >6.5\times 10^{-9} for
the combined data). We calculate the branching ratio in minimal supergravity
(mSUGRA) parameter space, and find that tan\beta > 30 can be probed. (This
mSUGRA parameter space cannot be probed by direct production of SUSY particles
at Run II.) Including other experimental constraints on the mSUGRA parameter
space, one finds that CDF \bsmumu measurements would be able to cover the full
mSUGRA parameter space for tan\beta = 50 if the muon g_{\mu} - 2 anomaly
exceeds \sim 11 \times 10^{-10}, and about half the allowed parameter space for
tan\beta = 40. A large branching ratio > 7(14) \times 10^{-8} (feasible with
only 2 \invfb) would be sufficient to exclude the mSUGRA model for tan\beta\leq
50(55). Dark matter neutralino-proton detection cross sections are examined in
the allowed region, and should be large enough to be accessible to future
planned experiments. Combined measurements of \bsmumu the Higgs mass m_h and
the muon g_{\mu}-2 anomaly would be sufficient to determine the \mu>0 mSUGRA
parameters (or show the model is inconsistent with the data). We also briefly
discuss the \bsmumu decay in R parity violating models. There, for some models,
the branching ratio can be large enough to be detected even for small tan\beta
and large \mhalf.


title:
Complete solution of Altarelli-Parisi evolution equation in
  next-to-leading order and non-singlet structure function at low-x

abstract:
  We present complete solution of Altarelli-Parisi (AP) evolution equation in
next-to-leading order (NLO) and obtain t-evolution of non-singlet structure
function at low-x. Results are compared with HERA low-x and low-Q^2 data and
also with those of complete solution in leading order (LO) of AP evolution
equation.


title: $1/m_b$ source in inclusive b-hadron decays

abstract:
  We show that threshold resummation of the end-point logarithms in inclusive
$b$-hadron decays leads to a Sudakov factor, which introduces $1/m_b$ power
corrections through infrared renormalons. These power corrections are strong
enough to account for the observed semileptonic branching ratio, charm yield,
and lifetime ratios by breaking the local quark-hadron duality.


title:
CP violating phase $\gamma$ and the partial widths asymmetry in $B^- \to
  \pi^+ \pi^- K^-$ and $B^- \to K^+ K^- K^-$ decays

abstract:
  Motivated by recent Belle measurement of the branching ratios $B^- \to \pi^+
\pi^- K^-$ and $B^- \to K^+ K^- K^-$ and $B^\pm \to \chi_{c0} K^\pm$, we
investigate the CP violating asymmetry in the partial widths for the decays
$B^- \to \pi^+ \pi^- K^-$ and $B^- \to K^+ K^- K^-$, which results from the
interference of the nonresonant decay amplitude with the resonant amplitude
$B^\pm \to \chi_{c0} K^\pm $ $ \to\pi^+ \pi^- K^\pm $ and $B^\pm \to \chi_{c0}
K^\pm$ $ \to K^+ K^- K^-$. By taking $\gamma \simeq 58^o$ we predict that the
partial widths asymmetry is reaching 10% for the $B^- \to \pi^+ \pi^- K^-$
decay and 16% for the $B^- \to K^+ K^- K^-$decay.


title:
A comparison of different methods in the study of dynamical fluctuations
  in high energy e+e- collisions

abstract:
  Different methods in the study of anomalous scaling of factorial moments in
high energy e+e- collisions are examined in some detail. It is shown that the
horizontal and vertical factorial moments are equivalent only when they are
used in combination with the cummulant variables. The influence of different
reference frames and that of phase space restrictions is also discussed.


title: Diffractive scattering

abstract:
  We discuss basic concepts and properties of diffractive phenomena in soft
hadron collisions and in deep-inelastic scattering at low Bjorken-x. The paper
is not a review of the rapidly developing field but presents an attempt to show
in simple terms the close inter-relationship between the dynamics of
high-energy hadronic and deep-inelastic diffraction. Using the saturation model
of Golec-Biernat and Wusthoff as an example, a simple explanation of
geometrical scaling is presented. The relation between the QCD anomalous
multiplicity dimension and the Pomeron intercept is discussed.


title: Four-pion production in e+ e- annihilation

abstract:
  We calculate the processes e+ e- -> 4 pions and tau -> nu_tau + 4 pions to
O(p^4) in the low-energy expansion of the standard model. The chiral amplitudes
of O(p^4) can be extended via resonance exchange to energies around 1 GeV.
Higher-order effects have been included in the form of omega, a_1 and double
rho exchange and by performing a resummation of the pion form factor. The
predicted cross sections and the branching ratios BR(rho -> 4 pions) are in
good agreement with available data.


title:
Criticism of "Necessity of simultaneous co-existence of instantaneous
  and retarded interactions in classical electrodynamics" by Andrew E.
  Chubykalo and Stoyan J. Vlaev

abstract:
  The demonstration that the electromagnetic fields derived from the
Lienard-Wiechert potentials do not satisfy the Maxwell equations is proved to
be false. Errors were made in the computation of the derivatives of retarded
quantities. The subsequent inference of the necessity of both instantaneous and
retarded electromagnetic interactions cannot be made. Different choices of
gauge can lead to a variety of forms for the scalar and vector potentials,
always with the same retarded fields. Classical electromagnetic theory is
complete as usually expressed. One may choose to work in the Lorenz gauge in
which all quantities are retarded.


title: RS1 Cosmology as Brane Dynamics in an AdS/Schwarzschild Bulk

abstract:
  We explore various facets of the cosmology of the Randall-Sundrum scenario
with two branes by considering the dynamics of the branes moving in a bulk
AdS/Schwarzschild geometry. This approach allows us both to understand in more
detail and from a different perspective the role of the stabilization of the
hierarchy in the brane cosmology, as well as to extend to the situation where
the metric contains a horizon. In particular, we explicitly determine how the
Goldberger-Wise stabilization mechanism perturbs the background bulk geometry
to produce a realistic cosmology.


title: Prospects for sgoldstino search at the LHC

abstract:
  In this paper we estimate the LHC sgoldstino discovery potential for the
signatures with gamma gamma and ZZ in a final state.


title: Strong Dynamics and Electroweak Symmetry Breaking

abstract:
  The breaking of the electroweak symmetry, and origin of the associated ``weak
scale,'' may be due to a new strong interaction. Theoretical developments over
the past decade have led to viable models and mechanisms that are consistent
with current experimental data. Many of these schemes feature a privileged role
for the top quark, and third generation, and are natural in the context of
theories of extra space dimensions at the weak scale. We review various models
and their phenomenological implications which will be subject to definitive
tests in future collider runs at the Tevatron, the LHC, and future linear
electron-positron colliders, as well as sensitive studies of rare processes.