title: Why is CPT fundamental?

abstract:
  G. L\"uders and W. Pauli proved the $\mathcal{CPT}$ theorem based on
Lagrangian quantum field theory almost half a century ago. R. Jost gave a more
general proof based on ``axiomatic'' field theory nearly as long ago. The
axiomatic point of view has two advantages over the Lagrangian one. First, the
axiomatic point of view makes clear why $\mathcal{CPT}$ is fundamental--because
it is intimately related to Lorentz invariance. Secondly, the axiomatic proof
gives a simple way to calculate the $\mathcal{CPT}$ transform of any
relativistic field without calculating $\mathcal{C}$, $\mathcal{P}$ and
$\mathcal{T}$ separately and then multiplying them. The purpose of this
pedagogical paper is to ``deaxiomatize'' the $\mathcal{CPT}$ theorem by
explaining it in a few simple steps. We use theorems of distribution theory and
of several complex variables without proof to make the exposition elementary.


title: Can Symmetric Texture reproduce Neutrino Bi-large Mixing?

abstract:
  We study the symmetric texture of geometric form with 2-zeros to see if it is
consistent with the presently-known neutrino masses and mixings. In the
neutrino mass matrix elements we obtain numerically the allowed region of the
parameters including CP violating phases, which can reproduce the present
neutrino experiment data. The result of this analysis dictates the narrow
region for the GUT model including Pati-Salam symmetry with texture zeros to be
consistent with the experimental data. The $|U_{e3}|$ and $J_{CP}$ are also
predicted in such models.


title:
Trace and chiral anomalies in QED and their underlying theory
  interpretation

abstract:
  Parametrizing the possible underlying theory or new physics' decoupling
effects in the most general way we reexamined the validity of canonical trace
relation and chiral symmetry in certain one-loop two-point functions. The
anomalies and the relation between chiral and trace Ward identities are
investigated and interpreted in the perspective of a complete underlying theory
or new physics instead of regularization, with some new phenomena found as
by-products.


title:
Atmospheric neutrinos: LMA oscillations, Ue3 induced interference and
  CP-violation

abstract:
  We consider oscillations of the low energy (sub-GeV sample) atmospheric
neutrinos in the three neutrino context. We present the semi-analytic study of
the neutrino evolution and calculate characteristics of the e-like events
(total number, energy spectra and zenith angle distributions) in the presence
of oscillations. At low energies there are three different contributions to the
number of events: the LMA contribution (from electron-neutrino oscillations
driven by the solar oscillation parameters), the Ue3-contribution proportional
to s13**2, and the Ue3 - induced interference of the two amplitudes driven by
the solar oscillation parameters. The interference term is sensitive to the
CP-violation phase. We describe in details properties of these contributions.
We find that the LMA, the interference and Ue3 contributions can reach 5 - 6%,
2 - 3% and 1 - 2 % correspondingly. An existence of the significant (> 3 - 5 %)
excess of the e-like events in the sub-GeV sample and the absence of the excess
in the multi-GeV range testifies for deviation of the 2-3 mixing from maximum.
We consider a possibility to measure the deviation as well as the CP- violation
phase in future atmospheric neutrino studies.


title: Grand Unification in the Projective Plane

abstract:
  A 6-dimensional grand unified theory with the compact space having the
topology of a real projective plane, i.e., a 2-sphere with opposite points
identified, is considered. The space is locally flat except for two conical
singularities where the curvature is concentrated. One supersymmetry is
preserved in the effective 4d theory. The unified gauge symmetry, for example
SU(5), is broken only by the non-trivial global topology. In contrast to the
Hosotani mechanism, no adjoint Wilson-line modulus associated with this
breaking appears. Since, locally, SU(5) remains a good symmetry everywhere, no
UV-sensitive threshold corrections arise and SU(5)-violating local operators
are forbidden. Doublet-triplet splitting can be addressed in the context of a
6d N=2 super Yang-Mills theory with gauge group SU(6). If this symmetry is
first broken to SU(5) at a fixed point and then further reduced to the standard
model group in the above non-local way, the two light Higgs doublets of the
MSSM are predicted by the group-theoretical and geometrical structure of the
model.


title:
Comment on the stability of the Yukawa couplings and the cosmological
  problems of intersecting brane models

abstract:
  In string theory, stabilization of moduli fields and their cosmological
implications have been discussed by many authors. In this paper we do not
consider conventional modulus, nor relative distance between two branes. We
focus our attention to a relative position of three intersecting branes.
Surprisingly, there had been no phenomonological argument on the stabilization
of such moduli. We will show that the area of the corresponding triangle is not
a free parameter, but an effective potential is generated from conventional
loop corrections in the low energy effective theory. Of course, the
stabilization does not induce any serious problem, because one is allowed to
modify other parameters of the model to adjust the Yukawa couplings. Then the
stabilization puts a constraint that is a different nature from the ones that
have been discussed before. We also discuss cosmological problems and show a
simple idea that can solve the problem.


title: The Muon Decay at the Two Loop Level of the Electroweak Interactions

abstract:
  The progress in the evaluation of the muon decay lifetime is reviewed. The
electroweak bosonic corrections are given together with the respective shift of
the W boson mass. After inclusion of the recently corrected fermionic
contributions, this requires an updated fitting formula for the prediction of
MW.


title: Inclusive Double Diffractive Production of SUSY Particles at the LHC

abstract:
  We estimate the inclusive double diffractive production of SUSY particles at
the LHC using a modified version of the POMWIG Monte Carlo event generator. The
diffractive events are produced via the Ingelman-Schlein model for double
pomeron exchange. The MSSM parameter space is scanned using the ``Snowmass
benchmark points'' and it is shown that the lightest Higgs boson is the only
SUSY particle with a large enough rate to be detected using these diffractive
events.


title:
A study of $q {\bar q}$ states in transverse lattice QCD using
  alternative fermion formulations

abstract:
  In this work we investigate $q{\bar q}$ spectra and wavefunctions of light
front transverse lattice Hamiltonians that result from different methods of
formulating fermions on the transverse lattice. We adopt the one link
approximation for the transverse lattice and Discrete Light Cone Quantization
to handle longitudinal dynamics. We perform a detailed study of the continuum
limit of DLCQ and associated techniques to manage severe light front infrared
divergences. We explore the effects of various parameters of the theory,
especially, the strength of the helicity-flip interaction and the link mass on
spectra and wavefunctions.


title: Light GUT Triplets and Yukawa Splitting

abstract:
  Triplet-mediated proton decay in Grand Unified Theories (GUTs) is usually
suppressed by arranging a large triplet mass. Here we explore instead a
mechanism for suppressing the couplings of the triplets to the first and second
generations compared to the Yukawa couplings, so that the triplets' mass can be
below the GUT scale. This mechanism is based on a ``triplet symmetry'' in the
context of product-group GUTs. We study two possibilities. One, which requires
the top Yukawa to arise from a non-renormalizable operator at the GUT scale, is
that all triplet couplings to matter are negligible, so that the triplets can
be at the weak scale. The second is that some triplet couplings, and in
particular $T t b$ and $T \bar{t} \bar{l}$, are equal to the corresponding
Yukawa couplings. This would give a distinct signature of grand unification if
the triplets were sufficiently light. However, we derive a model-independent
bound on the triplet mass in this case, which is at least 10$^6$GeV. Finally,
we construct a GUT model based on Yukawa splitting, with the triplets at
10$^{14}$GeV, as required for coupling unification to work.


title: The ${q}\bar{q}$ spectra and the structure of the scalar mesons

abstract:
  The ${q}\bar{q}$ spectrum is studied within a chiral constituent quark model.
It provides with a good fit of the available experimental data from light
(vector and pseudoscalar) to heavy mesons including some recent results on
charmonium. The $0^{++}$ light mesons and the new $D$ states measured at
different factories cannot be described as $q\bar q$ pairs and a tetraquark
structure is suggested.


title: New Perspectives for B-Physics from the Lattice

abstract:
  We give an introduction to the problems faced on the way to a reliable
lattice QCD computation of B-physics matrix elements. In particular various
approaches for dealing with the large scale introduced by the heaviness of the
b-quark are mentioned and promising recent achievements are described. We
present perspectives for future developments.


title:
Charm content of a proton in collinear parton model and in
  k_T-factorization approach

abstract:
  It is shown that the difference between the c-quark proton structure
functions calculated in the k_T-factorization approach using different
unintegrated gluon distribution functions is the same order as the difference
between results obtained in the parton model and in the k_T-factorization
approach.


title: The electron thermal propagator at p>>T: An entire function of p_{0}

abstract:
  The retarded electron propagator S_{R}(p_{0},p) at high momentum p>>T was
shown by Blaizot and Iancu to be an entire function of complex p_{0}. In this
paper a specific form for S_{R}(p_{0},p) is obtained and checked by showing
that its temporal Fourier transform S_{R}(t, p) has the correct behavior at
large t. Potential infrared and collinear divergences from the emission of soft
photons do not occur.


title:
Exploring Leptonic CP Violation by Reactor and Neutrino Superbeam
  Experiments

abstract:
  We point out the possibility that reactor measurement of theta_{13}, when
combined with high-statistics nu_e appearance accelerator experiments, can
detect leptonic CP violation. Our proposal is based on a careful statistical
analysis under reasonable assumptions on systematic errors, assuming 2 years
running of the neutrino mode J-PARC -> Hyper-Kamiokande experiment and a few
years running of a reactor experiment with 100 ton detectors at the
Kashiwazaki-Kariwa nuclear power plant. We show that the method can be arranged
to be insensitive to the intrinsic parameter degeneracy but is affected by the
one due to unknown sign of Delta m^2_{31}.


title: The Viscosity of Meson Matter

abstract:
  We report a calculation of the shear viscosity in a relativistic
multicomponent meson gas as a function of temperature and chemical potentials.
We approximately solve the Uehling-Uhlenbeck transport equation of kinetic
theory, appropriate for a boson gas, with relativistic kinematics. Since at low
temperatures the gas can be taken as mostly composed of pions, with a fraction
of kaons and etas, we explore the region where binary elastic collisions with
at least one pion are the dominant scattering processes. Our input meson
scattering phase shifts are fits to the experimental data obtained from chiral
perturbation theory and the Inverse Amplitude Method. Our results take the
correct non-relativistic limit (viscosity proportional to the square root of
the temperature), show a viscosity of order the cubed of the pion mass up to
temperatures somewhat below that mass, and then a large increase due to kaons
and etas. Our approximation may break down at even higher temperatures, where
the viscosity follows a temperature power law with an exponent near 3.


title:
Resummed jet rates for heavy quark production in electron-positron
  annihilation

abstract:
  Expressions for Sudakov form factors for heavy quarks are presented. They are
used to construct resummed jet rates in electron-positron annihilation.
Predictions are given for production of bottom quarks at LEP and top quarks at
the Linear Collider.


title: Resummed jet rates with heavy quarks in electron-positron collisions


title: Hadronic Spectra and Kaluza-Klein Picture of the World

abstract:
  A manifestation of Kaluza-Klein picture in hadron spectra is discussed. It is
argued that the experimentally observed structures in hadron spectra confirm
the Kaluza-Klein picture of the world.


title: Ultra-High Energy Neutrino Fluxes: New Constraints and Implications

abstract:
  We apply new upper limits on neutrino fluxes and the diffuse extragalactic
component of the GeV gamma-ray flux to various scenarios for ultra high energy
cosmic rays and neutrinos. As a result we find that extra-galactic top-down
sources can not contribute significantly to the observed flux of highest energy
cosmic rays. The Z-burst mechanism where ultra-high energy neutrinos produce
cosmic rays via interactions with relic neutrinos is practically ruled out if
cosmological limits on neutrino mass and clustering apply.


title: On a Neutrino Electroweak Radius

abstract:
  We study a combination of amplitudes for neutrino scattering that can isolate
a (gauge-invariant) difference of chirality-preserving neutrino electroweak
radii for $\nu_\mu$ and $\nu_\tau$. This involves both photon and $Z_\mu$
exchange contributions. It is shown that the construction singles out the
contributions of the hypercharge gauge field $B_{\mu}$ in the standard model.
We comment on how gauge-dependent terms from the charge radii cancel with other
terms in the relative electroweak radii defined.


title: The B-Meson Distribution Amplitude in QCD

abstract:
  The B-meson distribution amplitude is calculated using QCD sum rules. In
particular we obtain an estimate for the integral relevant to exclusive
B-decays \lambda_B = 460 \pm 110 MeV at the scale 1 GeV. A simple QCD-motivated
parametrization of the distribution amplitude is suggested.


title:
The Gluon Green's Function in the BFKL Approach at Next-to-Leading
  Logarithmic Accuracy

abstract:
  We investigate the gluon Green's function in the high energy limit of QCD
using a recently proposed iterative solution of the
Balitsky-Fadin-Kuraev-Lipatov (BFKL) equation at next-to-leading logarithmic
(NLL) accuracy. To establish the applicability of this method in the NLL
approximation we solve the BFKL equation as originally written by Fadin and
Lipatov, and compare the results with previous studies in the leading
logarithmic (LL) approximation.


title: Energy Loss of Leading Partons in a Thermal QCD Medium

abstract:
  We consider bremsstrahlung energy loss for hard partons traversing a
quark-gluon plasma. Accounting correctly for the probabilistic nature of the
energy loss, and making a leading-order accurate treatment of bremsstrahlung,
we find that the suppression of the spectrum is nearly flat, with the most
suppression at energies $E \sim 30 T$ ($T$ the QGP temperature), in contrast to
previous literature but in agreement with experimental data. This flat pattern
should also be observed at the LHC.


title: Measurement of $\theta_{13}$ by reactor experiments

abstract:
  I describe how reactor measurements of $\sin^22\theta_{13}$ can be improved
by a near-far detector complex. I show that in the Kashiwazaki plan it is
potentially possible to measure $\sin^2{2\theta_{13}}$ down to 0.02.


title: Chiral symmetry restoration in excited hadrons

abstract:
  The evidence, theoretical justification and implications of chiral symmetry
restoration in excited hadrons are presented.


title: The pion-pion scattering lengths from DIRAC

abstract:
  The scattering lengths of a two pion system are the {\it golden magnitudes}
to test the QCD predictions in the low energy sector. The DIRAC (PS-212)
experiment at CERN will obtain a particular combination of the S-wave isospin 0
and 2 scattering lengths by measuring the lifetime of pionium, the
hydrogen-like $\pi^+ \pi^-$ atom. This measurement tests the accurate
predictions of the Chiral Perturbation Theory. The most recent experimental
results are presented.


title: Muon Colliders, Monte Carlo and Gauge Invariance

abstract:
  If calculated in the standard way, the cross section for the collision of two
unstable particles turns out to diverge. This is because this cross section is
actually proportional to the size of the colliding beams. The effect is called
the "linear beam size effect". We present a way of including this linear beam
size effect in the usual Monte Carlo integration procedure. Furthermore we
discuss the gauge breaking that this may cause.


title:
Quark condensate and deviations from string-like behaviour of meson
  spectra

abstract:
  I analyse the hypothesis that deviations from the linear meson mass spectra
appear due to the dynamical chiral symmetry breaking in QCD. It is shown that
the linear mass spectrum for the light, non-strange vector and axial-vector
mesons is then parametrized by the constant $f_{\pi}$, being successful
phenomenologically. The toy model for deviations from linearity is proposed.


title:
Lattice-QCD-based Schwinger-Dyson Approach for Chiral Symmetry
  Restoration at Finite Temperature

abstract:
  We propose the Schwinger-Dyson (SD) formalism based on lattice QCD, i.e.,
LQCD-based SD formalism, for the study of dynamical chiral-symmetry breaking in
QCD. We extract the kernel function K(p^2) in the SD equation from the lattice
data of the quark propagator in the Landau gauge. As remarkable features, we
find infrared vanishing and intermediate enhancement of the kernel function
K(p^2) in the SD equation. We apply the LQCD-based SD equation to thermal QCD,
and calculate the quark mass function at the finite temperature. We find chiral
symmetry restoration at the critical temperature T_c \sim 100MeV.


title: Q ball inflation

abstract: We show that inflation can occur in the core of a Q-ball.


title:
A CP asymmetry in e^+e^- \to \chi^0_i\chi^0_j \to \chi^0_j \tau stau_k
  with tau polarization

abstract:
  We propose a CP-odd asymmetry in the supersymmetric process e^+e^- \to
\chi^0_i \chi^0_j \to \chi^0_j \tau stau_k by means of the transverse \tau
polarization. We calculate the asymmetry and cross sections at a future linear
collider in the 500 GeV c.m.s. energy range with longitudinal polarized beams
and high luminosity. We work in the Minimal Supersymmetric Standard Model with
complex parameters \mu, M_1 and A_\tau. The asymmetry can reach values up to 60
%. We also estimate the sensitivity for measuring the \tau polarization
necessary to probe the CP asymmetry.


title: The charmed strange meson system

abstract:
  Motivated by the recent surprising discovery of two new meson states with c
s-bar quark content but unexpectedly low masses and narrow total decay widths,
we work out, in a nonrelativistic potential-model approach developed already
some two decades ago, the predictions for the energy levels of the
corresponding charm-antistrange quark bound states. In spite of the fact that
this simple quark model reproduces the mass spectrum of the previously observed
hadrons remarkably well, we are led to the conclusion that, without
considerable modifications, both the new states do not fit into this framework.


title: Resonant Leptogenesis

abstract:
  We study the scenario of thermal leptogenesis in which the leptonic
asymmetries are resonantly enhanced through the mixing of nearly degenerate
heavy Majorana neutrinos that have mass differences comparable to their decay
widths. Field-theoretic issues arising from the proper subtraction of real
intermediate states from the lepton-number-violating scattering processes are
addressed in connection with an earlier developed resummation approach to
unstable particle mixing in decay amplitudes. The pertinent Boltzmann equations
are numerically solved after the enhanced heavy-neutrino self-energy effects on
scatterings and the dominant gauge-mediated collision terms are included. We
show that resonant leptogenesis can be realized with heavy Majorana neutrinos
even as light as about 1 TeV, in complete accordance with the current solar and
atmospheric neutrino data.


title: Parton Distributions

abstract:
  I discuss our current understanding of parton distributions. I begin with the
underlying theoretical framework, and the way in which different data sets
constrain different partons, highlighting recent developments. The methods of
examining the uncertainties on the distributions and those physical quantities
dependent on them is analysed. Finally I look at the evidence that additional
theoretical corrections beyond NLO perturbative QCD may be necessary, what type
of corrections are indicated and the impact these may have on the
uncertainties.


title: Lattice supersymmetry and string phenomenology

abstract:
  I discuss the usefulness of lattice supersymmetry in relation to string
phenomenology. I suggest how lattice results might be incorporated into string
phenomenology. I outline difficulties and describe some constructions that
contain an exact lattice version of supersymmetry, thereby reducing fine-tuning
of the regulator. I mention some problems that occur for these lattices.


title:
Phenomenology of the <VVP> Green's function within the Resonance Chiral
  Theory

abstract:
  We analyse the odd-intrinsic-parity effective Lagrangian of QCD valid for
processes involving one pseudoscalar with two vector mesons described in terms
of antisymmetric tensor fields. Substantial information on the
odd-intrinsic-parity couplings is obtained by constructing the
vector-vector-pseudoscalar Green's three-point function, at leading order in
1/N_C, and demanding that its short-distance behaviour matches the
corresponding OPE result. The QCD constraints thus enforced allow us to predict
the decay amplitude omega -> pi gamma, the O(p^6) corrections to pi -> gamma
gamma and the slope parameter in pi -> gamma gamma^*.


title: Dark Matter Detection in the Light of Recent Experimental Results

abstract:
  The existence of dark matter was suggested, using simple gravitational
arguments, seventy years ago. Although we are now convinced that most of the
mass in the Universe is indeed some non-luminous matter, we still do not know
its composition. The problem of the dark matter in the Universe is reviewed
here. Particle candidates for dark matter are discussed with particular
emphasis on Weakly Interacting Massive Particles (WIMPs). Experiments searching
for these relic particles, carried out by many groups around the world, are
also reviewed, paying special attention to their direct detection by observing
the elastic scattering on target nuclei through nuclear recoils. Finally, we
concentrate on the theoretical models predicting WIMPs, and in particular on
supersymmetric extensions of the standard model, where the leading candidate
for WIMP, the neutralino, is present. There, we compute the cross section for
the direct detection of neutralinos, and compare it with the sensitivity of
detectors. We mainly discuss supergravity, superstring and M-theory scenarios.


title: Forensic Cosmology: Probing Baryons and Neutrinos With BBN and the CBR

abstract:
  The primordial abundances of the light nuclides produced by Big Bang
Nucleosynthesis (BBN) during the first 20 minutes in the evolution of the
Universe are sensitive to the universal density of baryons and to the expansion
rate of the early Universe. For example, while deuterium is an excellent
baryometer, helium-4 provides an accurate chronometer. Some 400 kyr later, when
the cosmic background radiation (CBR) was freed from the grasp of the ionized
plasma of protons and electrons, the spectrum of temperature fluctuations also
depended on (among other parameters) the baryon density and the density in
relativistic particles. The comparison between the constraints imposed by BBN
and those from the CBR reveals a remarkably consistent picture of the Universe
at two widely separated epochs in its evolution. Combining these two probes
leads to new estimates of the baryon density at present and tighter constraints
on possible physics beyond the standard model of particle physics. In this
review the consistency between these complementary probes of the universal
baryon density and the early-Universe expansion rate is exploited to provide
new constraints on any asymmetry between relic neutrinos and anti-neutrinos
(neutrino degeneracy).


title:
Lower limits on R-parity-violating couplings in supersymmetric models
  with light squarks

abstract:
  We interpret the results of searches for strongly interacting massive
particles to place absolute lower limits on R-parity-violating couplings for
squarks with mass (m_\tilde{q}) below 100 GeV. Recent searches for anomalous
isotopes require that there be a baryon-number-violating or
lepton-number-violating coupling larger than 10^{-22} -- 10^{-21} if
m_\tilde{q} > 18 GeV. Using data from searches for stable particles at the CERN
Large Electron Positron collider (LEP) we demonstrate that this lower limit
increases by 14 orders of magnitude, to an R-parity-violating coupling larger
than 10^{-8} -- 10^{-7} for any squarks of mass less than 90 GeV. In the
presence of an R-parity-violating coupling of this magnitude, neutralinos
cannot explain the dark matter density in the Universe.


title: Confining Strings and High-Energy Reactions

abstract:
  We present the loop-loop correlation model that allows us to compute
confining flux tubes and to examine their effects and manifestations in
high-energy reactions.


title:
Addendum: The SNO Solar Neutrino Data, Neutrinoless Double Beta-Decay
  and Neutrino Mass Spectrum

abstract:
  We update our earlier study in [1], which was inspired by the 2002 SNO data,
on the implications of the results of the solar neutrino experiments for the
predictions of the effective Majorana mass in neutrinoless double beta-decay,
|<m>|. We obtain predictions for |<m>| using the values of the neutrino
oscillation parameters, obtained in the analyzes of the presently available
solar neutrino data, including the just published data from the salt phase of
the SNO experiment, the atmospheric neutrino and CHOOZ data and the first data
from the KamLAND experiment. The main conclusion reached in ref. [1] of the
existence of significant lower bounds on |<m>| in the cases of neutrino mass
spectrum of inverted hierarchical (IH) and quasi-degenerate (QD) type is
strongly reinforced by fact that combined solar neutrino data i) exclude the
possibility of cos(2 \theta_\odot)=0 at more than 5 s.d., ii) determine as a
best fit value cos(2 \theta_\odot)=0.40, and ii) imply at 95% C.L. that cos(2
\theta_\odot) \geq 0.22, \theta_\odot being the solar neutrino mixing angle.
For the IH and QD spectra we get using, e.g., the 90% C.L. allowed ranges of
values of the oscillation parameters, |<m>| \geq 0.010 eV and |<m>| \geq 0.043
eV, respectively. We also comment on the possibility to get information on the
neutrino mass spectrum and on the CP-violation in the lepton sector due to
Majorana CP-violating phases.


title:
Pion susceptibility of the QCD vacuum from an effective quark-quark
  interaction

abstract:
  A modified method for calculating the pion vacuum susceptibility from an
effective quark-quark interaction model is derived. Within this approach it is
shown that the pion vacuum susceptibility is free of ultraviolet divergence and
is much smaller than the previous estimations.


title: Effective Lagrangian for Baryons and Baryon-Meson Interaction

abstract:
  Expansion of model Nambu-Jona-Lasinio is considered and on its basis an
effective lagrangian for mesons, baryons and baryon - meson interaction has
been obtained.


title: Dark matter from SU(4) model

abstract:
  The left-right symmetric Pati-Salam model of the unification of quarks and
leptons is based on SU(4) and SU(2)xSU(2) groups. These groups are naturally
extended to include the classification of families of quarks and leptons. We
assume that the family group (the group which unites the families) is also the
SU(4) group. The properties of the 4-th generation of fermions are the same as
that of the ordinary-matter fermions in first three generations except for the
family charge of the SU(4)_F group: F=(1/3,1/3,1/3,-1), where F=1/3 for
fermions of ordinary matter and F=-1 for the 4-th generation. The difference in
F does not allow the mixing between ordinary and fourth-generation fermions.
Because of the conservation of the F charge, the creation of baryons and
leptons in the process of electroweak baryogenesis must be accompanied by the
creation of fermions of the 4-th generation. As a result the excess n_B of
baryons over antibaryons leads to the excess n_{\nu 4}=N-\bar N=n_B of
neutrinos over antineutrinos in the 4-th generation. This massive
fourth-generation neutrino may form the non-baryonic dark matter. In principle
their mass density n_{\nu 4}m_N in the Universe can give the main contribution
to the dark matter, since the lower bound on neutrino mass m_N from the data on
decay of the Z-bosons is m_N > m_Z/2. The straightforward prediction of this
model leads to the amount of cold dark matter relative to baryons, which is an
order of magnitude bigger than allowed by observations. This inconsistency may
be avoided by non-conservation of the F-charge.


title: Tetraquarks in a chiral constituent quark model

abstract:
  We analyze the possibility of heavy-light tetraquark bound states by means of
a chiral constituent quark model. The study is done in a variational approach.
Special attention is paid to the contribution given by the different terms of
the interacting potential and also to the role played by the different color
channels. We find a stable state for both $qq\bar{c}\bar{c}$ and
$qq\bar{b}\bar{b}$ configurations. Possible decay modes of these structures are
analyzed.


title:
Hard core attraction in hadron scattering and the family of the Ds meson
  molecule

abstract:
  We study the discovered Ds(2317) at BABAR, CLEO and BELLE, and find that it
belongs to a class of strange multiquarks, which is equivalent to the class of
kaonic molecules bound by hard core attraction. In this class of hadrons a kaon
is trapped by a s-wave meson or baryon. To describe this class of multiquarks
we apply the Resonating Group Method, and extract the hard core
kaon-meson(baryon)interactions. We derive a criterion to classify the
attractive channels. We find that the mesons f0(980), Ds(2457), Bs scalar and
axial, and also the baryons with the quantum numbers of Lambda, Xi_c, Xi_b and
also Omega_cc, Omega_cb and Omega_bb belong to the new hadronic class of the
Ds(2317).


title: Hadronisation at LEP

abstract:
  An overview of recent results from LEP concerning the hadronisation process
is presented. Emphasis is placed on the $b$-quark. The first presented analysis
is the measurement of the $b$-quark fragmentation function. It includes a new,
hadronic-model independent method to extract the x-dependence of the
non-perturbative QCD component from the measured fragmentation function. This
is followed by the results of two analyses on, respectively, production rates
of b-excited states and branching fractions of b-quarks to neutral and charged
b-hadrons. Multiplicity in the final state is also discussed concerning the
difference in multiplicities between b and light quark initiated events, and
total multiplicities in three jet events. Finally, recent measurements of
\omega and \eta meson production rates are given.


title: Precision measurement of oscillation parameters with reactors

abstract:
  We review the potential of long and intermediate baseline reactor neutrino
experiments in measuring the mass and mixing parameters. The KamLAND experiment
can measure the solar mass squared difference very precisely. However it is not
at the ideal baseline for measuring the solar neutrino mixing angle. If low-LMA
is confirmed by the next results from KamLAND, a reactor experiment with a
baseline of 70 km should be ideal to measure precisely the solar neutrino
mixing angle. If on the contrary KamLAND re-establishes high-LMA as a viable
solution, then a 20--30 km intermediate baseline reactor experiment could yield
very rich phenomenology.


title:
Impact of beam polarization on CP asymmetries in neutralino pair
  production

abstract:
  We analyze the dependence of CP-odd asymmetries on longitudinally polarized
e+ and e- beams in neutralino production and subsequent leptonic two-body
decays. We give numerical examples of the asymmetries and of the cross sections
in the Minimal Supersymmetric Standard Model with complex parameters mu, M_1
and A_{tau} for a collider with sqrt{s}=500 GeV. We show that longitudinally
polarized electron and positron beams can enhance considerably both the
asymmetries and the cross sections.


title: Neutrino Oscillations: A Global Analysis

abstract:
  We review the status of the neutrino oscillation physics (as of June 2003),
with a particular emphasis on the present knowledge of the neutrino mass-mixing
parameters in a three generation approach. We consider first the nu_mu-->nu_tau
flavor transitions of atmospheric neutrinos. It is found that standard
oscillations provide the best description of the SK+K2K data, and that the
associated mass-mixing parameters are determined at 1 sigma (and dof=1) as:
Delta m^2=(2.6 +-0.4) x 10^-3 eV^2 and sin^2(2theta)=1.00+0.00-0.05. Such
indications, presently dominated by SK, could be strengthened by further K2K
data. Then we analyze the energy spectrum of reactor neutrino events recently
observed at KamLAND and combine them with solar and terrestrial neutrino data.
We find that the solution to the solar neutrino problem at large mixing angle
(LMA) is basically split into two sub-regions, that we denote as LMA-I and
LMA-II. The LMA-I solution, characterized by lower values of the squared
neutrino mass gap, is favored by the global data fit. Finally, we briefly
illustrate how prospective data from the SNO and KamLAND can increase our
confidence in the occurrence of standard matter effects in the Sun, which are
starting to emerge from current data.


title: Relativistic Faddeev approach to a non-local NJL model

abstract:
  The diquark and nucleon are studied in a non-local NJL model. We solve the
relativistic Faddeev equation and compare the results with the ordinary NJL
model. Although the model is quark confining, it is not diquark confining in
the rainbow-ladder approximation. We show that the off-shell contribution to
the diquark $T$ matrix is crucial for the structure of the nucleon: without its
inclusion the attraction in the scalar channel is too weak to form a three-body
bound state.


title: NUFACT'03: The Fate of the Clones

abstract:
  We present a Neutrino-Factory-based setup with three detectors of different
kind in principle capable to solve the eightfold-degeneracy in the simultaneous
measurement of $\theta_{13}$ and $\delta$, for $\theta_{13} \geq 1^\circ
(\sin^2 (2 \theta_{13}) \geq 10^{-3})$. Our setup includes a Superbeam-driven
water Cherenkov (the Superbeam conceived as the first stage of the Neutrino
Factory); two muon-storage-ring-driven detectors (namely, a large magnetized
iron calorimeter and an emulsion cloud chamber) to take advantage of both the
so-called "golden" ($\nu_e \to \nu_\mu$) and "silver" ($\nu_e \to \nu_\tau$)
channels.


title: Nonrigid chiral soliton for the octet and decuplet baryons

abstract:
  Systematic treatment of the collective rotation of the nonrigid chiral
soliton is developed in the SU(3) chiral quark soliton model and applied to the
octet and decuplet baryons. The strangeness degrees of freedom are treated by a
simplified bound-state approach which omits the locality of the kaon wave
function. Then, the flavor rotation is divided into the isospin rotation and
the emission and absorption of the kaon. The kaon Hamiltonian is diagonalized
by the Hartree approximation. The soliton changes the shape according to the
strangeness. The baryons appear as the rotational bands of the combined system
of the soliton and the kaon.


title: An Improved Splitting Function for Small x Evolution

abstract:
  We summarize our recent result for a splitting function for small x evolution
which includes resummed small x logarithms deduced from the leading order BFKL
equation with the inclusion of running coupling effects. We compare this
improved splitting function with alternative approaches.


title:
Dynamics of effective gluon fields in hadrons in the method of field
  correlators

abstract: This paper has been withdrawn by the author.


title:
The trilinear neutral Higgs self-couplings in the MSSM. Complete
  one-loop analysis

abstract:
  The Higgs boson effective self-couplings $\lambda_{hhh}$ and $\lambda_{HHH}$
are calculated in the framework of the Minimal Supersymmetric Standard Model
(MSSM) for the complete set of one-loop diagrams with one of the Higgs bosons
off-shell. The comparison with previous results, where only the leading
correction terms in the limiting case of large masses of virtual particles were
calculated, is carried out. We analyse the dependence of the self-couplings on
the energy and ${\tt tan} \beta$; it is demonstrated that the tree-level
self-couplings could acquire substantial one-loop corrections, which could be
phenomenologically important.


title: Exotic Theta^+ baryon production induced by a photon and a pion

abstract:
  We investigate the photoproduction of the $\Theta^+(1540)$ on a nucleon
($\gamma n \to K^- \Theta^+$, $\gamma p \to \bar{K}^0 \Theta^+$) and the
pion-induced $\Theta^+$ production reaction on the proton ($\pi^- p \to K^-
\Theta^+$). The total cross sections near threshold are estimated by using
hadronic models with effective interaction Lagrangians and form factors that
preserve gauge-invariance of the electromagnetic current. The photoproduction
cross sections are found to be a few hundred nb, with the cross section on the
proton being larger than that on the neutron. The pion-induced production cross
section is found to be around a few hundred $\mu$b but sensitive to the $K^* N
\Theta$ coupling whose value is not yet known. We also study the production
cross section assuming that the $\Theta^+$ has negative parity. The cross
sections are then found to be much suppressed compared to the case where
$\Theta^+$ has positive parity. Hence, the interpretation of the $\Theta^+$ as
an odd-parity pentaquark state seems to be disfavored from the estimates of
cross section for the photon-proton reaction from the SAPHIR experiment.


title: Interpreting the time-dependent CP asymmetry in $B^0 \to \pi^0 K_S$

abstract:
  Flavor SU(3) is used for studying the time-dependent CP asymmetry in $B^0 \to
\pi^0 K_S$ by relating this process to $B^0\to \pi^0\pi^0$ and $B^0 \to
K^+K^-$. We calculate correlated bounds on $S_{\pi K} - \sin 2\beta$ and
$C_{\pi K}$, with maximal magnitudes of 0.2 and 0.3, where $S_{\pi K}$ and
$C_{\pi K}$ are coefficients of $\sin\Delta mt$ and $\cos\Delta mt$ in the
asymmetry. Stronger upper limits on $B^0 \to K^+K^-$ are expected to reduce
these bounds and to imply nonzero lower limits on these observables. The
asymmetry is studied as a function of a strong phase and the weak phase
$\gamma$.


title: Searches for New Particles at the Energy Frontier at the Tevatron

abstract:
  Run 2 at the Tevatron started in spring 2001. CDF and D0 are taking data at a
center-of-mass energy of 1.96 TeV. First results on searches for phenomena
beyond the Standard Model are presented. In January 2003, the integrated
luminosity recorded per experiment was lower than the luminosity collected at
Run 1. Nevertheless, these results are already competitive due to improved
detector capabilities and to the increase in the center-of-mass energy.


title:
Dark matter searches: looking for the cake or its frosting?
  (Detectability of a subdominant component of the CDM)

abstract:
  The dark matter candidates we are searching for, e.g. neutralinos, may be one
of many components of the cold dark matter (CDM). We point out here that very
subdominant components, constituting even 1% of the CDM for indirect detection
and much less for direct detection, remain observable in current and future
searches. So if a CDM signal is confirmed in CDM search experiments (except for
a signal from annihilations in the dark halo) we will need to find out the halo
fraction accounted for the CDM component we detected.


title:
Long Baseline Neutrino Oscillations: Parameter Degeneracies and JHF/NuMI
  Complementarity

abstract:
  A summary of the parameter degeneracy issue for long baseline neutrino
oscillations is presented and how a sequence of measurements can be used to
resolve all degeneracies. Next, a comparison of the JHF and NuMI Off-Axis
proposals is made with emphasis on how both experiments running neutrinos can
distinguish between the normal and inverted hierarchies provided the E/L of
NuMI is less than or equal to the E/L of JHF. Due to the space limitations of
this proceedings only an executive style summary can be presented here, but the
references and transparencies of the talk contain the detailed arguments.


title: Tracking Curvaton(s)?

abstract:
  The ratio of the curvaton energy density to that of the dominant component of
the background sources may be constant during a significant period in the
evolution of the Universe. The possibility of having tracking curvatons, whose
decay occurs prior to the nucleosynthesis epoch, is studied. It is argued that
the tracking curvaton dynamics is disfavoured since the value of the curvature
perturbations prior to curvaton decay is smaller than the value required by
observations. It is also argued, in a related context, that the minimal
inflationary curvature scale compatible with the curvaton paradigm may be
lowered in the case of low-scale quintessential inflation.


title: Perturbative corrections to curvature sum rules

abstract:
  Two new sum rules were recently discovered by Le Yaouanc et al. by applying
the operator product expansion to the nonforward matrix element of a
time-ordered product of $b \to c$ currents in the heavy-quark limit of QCD.
They lead to the constraints $\sigma^2 > 5\rho^2/4$ and $\sigma^2 >
3(\rho^2)^2/5 + 4\rho^2/5$ on the curvature of the $\bar{B} \to D^{(*)}$
Isgur-Wise function, both of which imply the absolute lower bound $\sigma^2 >
15/16$ when combined with the Uraltsev bound $\rho^2 > 3/4$ on the slope. This
paper calculates order $\alpha_s$ corrections to these bounds, increasing the
accuracy of the resultant constraints on the physical form factors. The latter
may have implications for the determination of $|V_{cb}|$ from exclusive
semileptonic $B$ meson decays.


title: Pentaquark as Kaon-Nucleon Resonance

abstract:
  Several recent experiments have reported evidence for a narrow feature in the
K(+)-neutron system, an apparent resonant state ~ 100 MeV above threshold and
with a width < 25 MeV. This state has been labelled as Theta(+) (previously as
Z(*)), and because of the implied inclusion of a anti-strange quark, is
referred to as a pentaquark, that is, five quarks within a single bag. We
present an alternative explanation for such a structure, as a higher angular
momentum resonance in the isospin zero K(+) -N system. One might call this an
exit channel or a molecular resonance. In a non-relativistic potential model we
find a possible candidate for the kaon-nucleon system with relative angular
momentum L=3, while L=1 and 2 states possess centrifugal barriers too low to
confine the kaon and nucleon in a narrow state at an energy so high above
threshold. A rather strong state-dependence in the potential is essential,
however, for eliminating an observable L=2 resonance at lower energies.


title:
An Interacting Parton Model for Quark and Anti-quark distributions in
  the Baryon

abstract:
  In this paper we study a 1+1 dimensional relativistic parton model for the
structure of baryons. The quarks and anti-quarks interact through a linear
potential. We obtain an analytic formula for the isospin averaged valence quark
distribution in the chiral and large Nc limits. The leading 1/Nc and non-zero
current quark mass corrections are estimated. Then we extend this model to
include `sea' and anti-quarks. We find that the anti-quark content is small at
a low value of Q^2. Using these distributions as initial conditions for Q^2
evolution, we compare with experimental measurements of the structure function
xF_3(x,Q^2) and find reasonable agreement. The only parameters we can adjust
are the fraction of baryon momentum carried by valence quarks and the initial
scale Q_0^2.


title: The effective neutrino charge radius

abstract:
  It is shown that at one-loop order a neutrino charge radius (NCR) may be
defined, which is ultraviolet finite, does not depend on the gauge-fixing
parameter, nor on properties of the target other than its electric charge. This
is accomplished through the systematic decomposition of physical amplitudes
into effective self-energies, vertices, and boxes, which separately respect
electroweak gauge invariance. In this way the NCR stems solely from an
effective proper photon-neutrino one-loop vertex, which satisfies a naive,
QED-like Ward identity. The NCR so defined may be extracted from experiment, at
least in principle, by expressing a set of experimental electron-neutrino
cross-sections in terms of the finite NCR and two additional gauge- and
renormalization-group-invariant quantities, corresponding to the electroweak
effective charge and mixing angle.


title:
CJK- Improved LO Parton Distributions in the Real Photon and Their
  Experimental Uncertainties

abstract:
  A new analysis of the radiatively generated, LO quark (u,d,s,c,b) and gluon
densities in the real, unpolarized photon, improved in respect to our paper
[1], is presented. We perform four new global fits to the experimental data for
F2^gamma, two using a standard FFNS approach and two based on ACOT(chi) scheme
[2], leading to the FFNS(CJK) and CJK models. We also present the analysis of
the uncertainties of the new CJK 2 parton distributions due to the experimental
errors, the very first such analysis performed for the photon. This analysis is
based on the Hessian method, for a comparison for chosen cross-sections we use
also the Lagrange method.


title: Varying Alpha and the Electroweak Model

abstract:
  Inspired by recent claims for a varying fine structure constant, alpha, we
investigate the effect of ``promoting coupling constants to variables'' upon
various parameters of the standard model. We first consider a toy model:
Proca's theory of the massive photon. We then explore the electroweak theory
with one and two dilaton fields. We find that a varying alpha unavoidably
implies varying W and Z masses. This follows from gauge invariance, and is to
be contrasted with Proca' theory. For the two dilaton theory the Weinberg angle
is also variable, but Fermi's constant and the tree level fermion masses remain
constant unless the Higgs' potential becomes dynamical. We outline some
cosmological implications.


title: QCD: Confinement, Hadron Structure and DIS

abstract:
  The main features of QCD, e.g. confinement, chiral symmetry breaking, Regge
trajectories are naturally and economically explained in the framework of the
Field Correlator Method (FCM). The same method correctly predicts the spectrum
of hybrids and glueballs. When applied to DIS and high-energy scattering it
leads to the important role of higher Fock components in the Fock tower of
moving hadron, containing primarily gluonic excitations.


title:
Charge asymmetry in $\pi^+\pi^-$ electroproduction on proton at high
  energies as a test of $\sigma,\rho$ mesons degeneration

abstract:
  The charge asymmetry induced by interference of amplitudes with $\sigma$ and
$\rho$ mesons decaying to $\pi^+\pi^-$ pair created in the fragmentation region
of proton, suggest to be a test of degeneration hypothesis of $\rho$ and
$\sigma$ mesons. Some numerical estimations are given.


title: Mass spectrum of heavy hybrid mesons in the QCD string model

abstract:
  This paper has been withdrawn by the author, since it had been the worse
repetition of hep-ph/0302070.


title:
Static potentials and confining field structure of baryons and
  3g-glueballs

abstract:
  This paper has been withdrawn by the authors, since it had been the excessive
repetition of the part of hep-ph/0310190.


title: Gauge-invariant effective fields in QCD and the strong charge screening

abstract: This paper has been withdrawn by the author.


title:
Measurement of the Two Photon Decay Width of the Higgs Boson at the
  TESLA Photon Collider

abstract:
  We report on the accuracy of the measurement of the two photon decay width of
a Higgs boson with the mass of 120 GeV at the TESLA Photon Collider, assuming a
$\gamma \gamma$ integrated luminosity of 80 fb$^{-1}$ in the hard part of the
spectrum. The QCD radiative corrections for the quark pair background processes
are taken into account by a reweighting procedure. We found that the product
$\Gamma (\rm H \to \gamma \gamma) \times \rm BR (\rm H \to \rm b \bar{\rm b})$
can be measured with the statistical error of 1.8% in one year of run.


title: Lower limit on the neutralino mass in the general MSSM

abstract:
  We discuss constraints on SUSY models with non-unified gaugino masses and R_P
conservation. We derive a lower bound on the neutralino mass combining the
direct limits from LEP, the indirect limits from gmuon, bsgamma, Bsmumu and the
relic density constraint from WMAP. The lightest neutralino (mneutralino=6GeV)
is found in models with a light pseudoscalar with MA<200GeV and a large value
for $tan\beta$. Models with heavy pseudoscalars lead to mneutralino>18(29)GeV
for $\tan\beta=50(10)$. We show that even a very conservative bound from the
muon anomalous magnetic moment can increase the lower bound on the neutralino
mass in models with mu<0 and/or large values of $\tan\beta$. We then examine
the potential of the Tevatron and the direct detection experiments to probe the
SUSY models with the lightest neutralinos allowed in the context of light
pseudoscalars with high $\tan\beta$. We also examine the potential of an e+e-
collider of 500GeV to produce SUSY particles in all models with neutralinos
lighter than the W. In contrast to the mSUGRA models, observation of at least
one sparticle is not always guaranteed.


title: Positive Parity Pentaquarks Pragmatically Predicted

abstract:
  We consider the possibility that the lightest pentaquark is a parity even
state, with one unit of orbital angular momentum. Working within the framework
of a constituent quark model, we show that dominant spin-flavor interactions
render certain parity-even states lighter than any pentaquark with all quarks
in the spatial ground state. For such states, we focus on predicting the mass
and decays of other members of the same SU(3) flavor multiplet. Specifically,
we consider the strangeness -2 cascade pentaquarks, which are relatively immune
to mixing. We take into account flavor SU(3) breaking effects originating from
the strange quark mass as well as from the structure of the spin-flavor
exchange interactions themselves. We predict the lightest cascade pentaquarks
at approximately 1906 MeV, with a full width about 3 times larger than that of
the Theta^+.


title: Top Quarks and Electroweak Symmetry Breaking in Little Higgs Models

abstract:
  `Little Higgs' models, in which the Higgs particle arises as a
pseudo-Goldstone boson, have a natural mechanism of electroweak symmetry
breaking associated with the large value of the top quark Yukawa coupling. The
mechanism typically involves a new heavy SU(2)_{L} singlet top quark, T. We
discuss the relationship of the Higgs boson and the two top quarks. We suggest
experimental tests of the Little Higgs mechanism of electroweak symmetry
breaking using the production and decay of the T at the Large Hadron Collider.


title: A study of pentaquark $\Theta$ state in the chiral SU(3) quark model

abstract:
  The structure of the pentaquark state uudd-sbar is studied in the chiral
SU(3) quark model as well as in the extended chiral SU(3) quark model, in which
the vector meson exchanges are included. Four configurations of JP=1/2- and
four of JP=1/2+ are considered. The results show that the isospin T=0 state is
always the lowest one for both JP=1/2- and JP=1/2+ cases in various models. But
the theoretical value of the lowest one is still about 200-300 MeV higher than
the experimental mass of $\Theta$. It seems that a dynamical calculation should
be done for the further study.


title: Aspects of spin-dependent dark matter search

abstract:
  The Weakly Interacting Massive Particle (WIMP) is the main candidate for the
relic dark matter. A set of exclusion curves currently obtained for cross
sections of the spin-dependent WIMP-proton and WIMP-neutron interaction is
given. A two-orders-of-magnitude improvement of the sensitivity of the dark
matter experiment is needed to reach the SUSY predictions for relic
neutralinos. It is noted that near-future experiments with the high-spin
isotope Ge-73 can yield a new important constraint on the neutralino-neutron
effective coupling and the SUSY parameter space.


title: B_s -> mu mu as a Probe of Tan(beta) at the Tevatron

abstract:
  Recently it has been understood that flavor-changing processes mediated by
Higgs bosons could be a new and powerful tool for discovering supersymmetry. In
this paper we show that they may also provide an important method for
constraining the parameters of the minimal supersymmetric standard model
(MSSM). Specifically, we show that observation of B_s -> mu mu at the Tevatron
implies a significant, model-independent lower bound on tan(beta) in the MSSM.
This is very important because tan(beta) enters crucially in predictions and
interpretations of the MSSM, though it is difficult to measure. Within specific
models, or with other data, the bound becomes significantly stronger.


title: Raising Sfermion Masses by Adding Extra Matter Fields

abstract:
  The renormalization group flow of soft supersymmetry breaking masses is
sensitive to the field contents of the theory one considers. We point out that
the addition of extra vector-like matter fields to the minimal supersymmetric
standard model raises the masses of squarks and sleptons relative to those of
gauginos. We discuss its phenomenological implications. Besides an obvious
effect to the superparticle mass spectrum, we find that radiative corrections
from heavier stop loops increase the lightest CP-even Higgs boson mass. We also
discuss impact on models with no-scale boundary conditions. It turns out that,
unlike the minimal case, staus can become heavier than a B-ino like neutralino,
which is cosmologically favored.


title: The Spectral Quark Model and Light Cone Phenomenology

abstract:
  Chiral quark models offer a practical and simple tool to describe covariantly
both low and high energy phenomenology in combination with QCD evolution. This
can be done in full harmony with chiral symmetry and electromagnetic gauge
invariance. We review the recently proposed spectral quark model where all
these constraints are implemented.


title: pi K scattering inputs to ChPT

abstract:
  Experimental information on low energy $\pi K$ scattering would shed light on
the poorly known OZI suppressed sector of ChPT. I describe recent work aimed at
generating such information based on available experimental data by setting up
and then solving with appropriate boundary conditions a non linear system of
equations of the Roy and Steiner type. First results of this analysis are
presented.


title:
Realistic constraints on the doubly charged bilepton couplings from
  Bhabha scattering with LEP data

abstract:
  Upper limits on doubly charged bilepton couplings and masses are extracted
from LEP data for Bhabha scattering at energy range $\sqrt{s}=183-202$ GeV
using standard model program ZFITTER which calculates radiative corrections. We
find that $g_{L}^{2}/M_{L}^{2}<O(10^{-5})GeV^{-2}$ at 95% C.L. for scalar and
vector bileptons.


title:
$ZZ\gamma$ and $Z\gamma\gamma$ couplings in $\gamma e$ collision with
  polarized beams

abstract:
  The potential of $\gamma$e mode of linear $e^{+}e^{-}$ collider to probe
$ZZ\gamma$ and $Z\gamma\gamma$ vertices is investigated through the Z boson
production from the procees $\gamma e\to Z e$. Considering the longitudinal and
transverse polarization states of the Z boson and incoming polarized beams we
find the 95% C.L. limits on the form factors $h_{3}^{Z}$, $h_{4}^{Z}$,
$h_{3}^{\gamma}$ and $h_{4}^{\gamma}$ with integrated luminosity 500$fb^{-1}$
and $\sqrt{s}=$0.5, 1, 1.5 TeV energies. It is shown that the polarization can
improve sensitivities by factors 2-3 depending on the energy.


title:
Impact-Parameter Dependence of the Diagonal GPD of the Pion from Chiral
  Quark Models

abstract:
  We analyze the impact-parameter dependent diagonal non-singlet generalized
parton distribution of the pion in two distinct chiral quark models: the
Spectral Quark Model and the Nambu-Jona-Lasinio model. Leading-order
perturbative QCD evolution from the low quark-model scale to higher scales is
carried out with the help of the inverse Mellin transform. The model agrees
very reasonably with the recent results from transverse-lattice calculations,
while the forward parton distribution agrees with the experimental data.


title:
Chemical equilibrium study in nucleus-nucleus collisions at relativistic
  energies

abstract:
  We present a detailed study of chemical freeze-out in nucleus-nucleus
collisions at beam energies of 11.6, 30, 40, 80 and 158A GeV. By analyzing
hadronic multiplicities within the statistical hadronization approach, we have
studied the strangeness production as a function of centre of mass energy and
of the parameters of the source. We have tested and compared different versions
of the statistical model, with special emphasis on possible explanations of the
observed strangeness hadronic phase space under-saturation. We show that, in
this energy range, the use of hadron yields at midrapidity instead of in full
phase space artificially enhances strangeness production and could lead to
incorrect conclusions as far as the occurrence of full chemical equilibrium is
concerned. In addition to the basic model with an extra strange quark
non-equilibrium parameter, we have tested three more schemes: a two-component
model superimposing hadrons coming out of single nucleon-nucleon interactions
to those emerging from large fireballs at equilibrium, a model with local
strangeness neutrality and a model with strange and light quark non-equilibrium
parameters. The behaviour of the source parameters as a function of colliding
system and collision energy is studied. The description of strangeness
production entails a non-monotonic energy dependence of strangeness saturation
parameter gamma_S with a maximum around 30A GeV. We also present predictions of
the production rates of still unmeasured hadrons including the newly discovered
Theta^+(1540) pentaquark baryon.


title: Models of maximal atmospheric neutrino mixing

abstract:
  We discuss two types of neutrino mass matrices which both give $\theta_{23} =
45^\circ$, i.e., a maximal atmospheric mixing angle. We review three models,
based on the seesaw mechanism and on simple extensions of the scalar sector of
the Standard Model, where those mass matrices are obtained from symmetries.


title: Out-of-equilibrium electromagnetic radiation

abstract:
  We derive general formulas for photon and dilepton production rates from an
arbitrary non-equilibrated medium from first principles in quantum field
theory. At lowest order in the electromagnetic coupling constant, these relate
the rates to the unequal-time in-medium photon polarization tensor and
generalize the corresponding expressions for a system in thermodynamic
equilibrium. We formulate the question of electromagnetic radiation in real
time as an initial value problem and consistently describe the virtual
electromagnetic dressing of the initial state. In the limit of slowly evolving
systems, we recover known expressions for the emission rates and work out the
first correction to the static formulas in a systematic gradient expansion.
Finally, we discuss the possible application of recently developed techniques
in non-equilibrium quantum field theory to the problem of electromagnetic
radiation. We argue, in particular, that the two-particle-irreducible (2PI)
effective action formalism provides a powerful resummation scheme for the
description of multiple scattering effects, such as the
Landau-Pomeranchuk-Migdal suppression recently discussed in the context of
equilibrium QCD.


title: Radion Induced Spontaneous Baryogenesis

abstract:
  We describe a possible scenario for the baryogenesis arising when matter is
added on the branes of a Randall-Sundrum model with a radion stabilizing
potential. We show that the radion field can naturally induce spontaneous
baryogenesis when the cosmological evolution for the matter on the branes is
taken into account.


title:
The SUSY seesaw model and lepton-flavor violation at a future
  electron-positron linear collider

abstract:
  We study lepton-flavor violating slepton production and decay at a future
e^+e^- linear collider in context with the seesaw mechanism in mSUGRA post-LEP
benchmark scenarios. The present knowledge in the neutrino sector as well as
improved future measurements are taken into account. We calculate the signal
cross-sections \sigma(e^{+/-}e^- -> l_{\beta}^{+/-} l_{\alpha}^-
\tilde{\chi}_b^0 \tilde{\chi}_a^0); l_{\delta}=e, \mu, \tau; \alpha =|= \beta
and estimate the main background processes. Furthermore, we investigate the
correlations of these signals with the corresponding lepton-flavor violating
rare decays l_{\alpha} -> l_{\beta} \gamma. It is shown that these correlations
are relatively weakly affected by uncertainties in the neutrino data, but very
sensitive to the model parameters. Hence, they are particularly suited for
probing the origin of lepton-flavor violation.


title: Footprints of Super-GZK Cosmic Rays in the Pilliga State Forest

abstract:
  High energy cosmic ray data collected by the SUGAR Collaboration in the
Pilliga State Forest have been re-analyzed using up-to-date shower simulations.
Complete, inclined angle, Monte Carlo simulations reveal 2 events with energies
in excess of $7\times 10^{19}$ eV at 95% CL, independent of the choice of
hadronic interaction model and of chemical composition of the primary. An
additional 3 events, with mean energy $\agt 7\times 10^{19}$ eV, were also
re-analyzed in the same manner. A lower bound on the flux at the high end of
the spectrum, as observed in the Southern sky, is presented on the basis of our
analysis.


title:
Effects of the Neutrino B-term on Slepton Mixing and Electric Dipole
  Moments

abstract:
  The supersymmetric standard model with right-handed neutrino supermultiplets
generically contains a soft supersymmetry breaking mass term: $\delta L ={1
\over 2} B_\nu M\tilde{\nu}_R \tilde {\nu}_R$. We call this operator the
"neutrino $B$-term". We show that the neutrino $B$-term can give the dominant
effects from the neutrino sector to lepton flavor violating processes and to
lepton electric dipole moments.


title: Probing the Higgs self-coupling at hadron colliders using rare decays

abstract:
  We investigate Higgs boson pair production at hadron colliders for Higgs
boson masses m_H\leq 140 GeV and rare decay of one of the two Higgs bosons.
While in the Standard Model the number of events is quite low at the LHC, a
first, albeit not very precise, measurement of the Higgs self-coupling is
possible in the gg -> HH -> b\bar{b}\gamma\gamma channel. A luminosity-upgraded
LHC could improve this measurement considerably. A 200 TeV VLHC could make a
measurement of the Higgs self-coupling competitive with a next-generation
linear collider. In the MSSM we find a significant region with observable Higgs
pair production in the small \tan\beta regime, where resonant production of two
light Higgs bosons might be the only hint at the LHC of an MSSM Higgs sector.


title: Proposal to observe the strong Van der Waals force in e+\bar{e} -> 2 \pi

abstract:
  Large discrepancy of the p-wave phase shift data $\delta_{1}(\nu)$ of the
$\pi$-$\pi$ scattering from those of the dispersion calculation is pointed out.
In order to determine which is correct, the pion form factor $F_{\pi}(\nu)$,
which is the second source of information of the phase shift $\delta_{1}(\nu)$,
is used. It is found that the phase shift obtained from the dispersion is not
compatible with the data of the pion form factor. What is wrong with the
dispersion calculation, is considered.


title: Power Corrections to e+e- Dijet Event Shapes

abstract:
  We discuss a class of event shapes for e+e- dijet events that include the
thrust as a special case. Large logarithmic corrections to the corresponding
cross sections can be resummed to all logarithmic orders at leading power.
However, irrespective of the order up to which the perturbative expansion is
calculated, it has to be supplemented by nonperturbative corrections due to its
at best asymptotic nature. We find that the leading power corrections are
universal for the class of event shapes discussed here. Based on these
findings, we provide sample numerical predictions for the distributions of the
new event shapes.


title:
CP Violation and $\Delta I=1/2$ Enhancement for $K \to \pi\pi$, $K \to
  \pi\pi\gamma$ Weak Decays

abstract:
  Data indicate that $\Delta I=1/2$ transitions account for 4.5-4.7% of both CP
conserving and CP violating $K \to 2\pi$ decays, as well as CP conserving
radiative $K \to \pi\pi\gamma$ processes. Observed $K \to \pi\pi\gamma/\pi\pi$
branching ratios are shown to scale near $\alpha/\pi$ or $\alpha/2\pi$. The
$K_L$-$K_S$ mixing angle $\phi$ and the semileptonic weak-rate asymmetry
$\delta$ are reviewed, and theory is shown to be consistent with data. Also, $K
\to 2\pi$ $\Delta I=1/2$ dominance is studied in the context of the chiral
constituent quark model, displaying again excellent agreement with data.
Finally, indirect and direct kaon CP violation are successfully described in
the framework of photon-mediated loop graphs. This suggests that kaon CPV can
be understood via second-order weak transitions, radiatively corrected.


title: Two-Loop Bethe Logarithms

abstract:
  We calculate the two-loop Bethe logarithm correction to atomic energy levels
in hydrogen-like systems. The two-loop Bethe logarithm is a low-energy quantum
electrodynamic (QED) effect involving multiple summations over virtual excited
atomic states. Although much smaller in absolute magnitude than the well-known
one-loop Bethe logarithm, the two-loop analog is quite significant when
compared to the current experimental accuracy of the 1S-2S transition: it
contributes -8.19 and -0.84 kHz for the 1S and the 2S state, respectively. The
two-loop Bethe logarithm has been the largest unknown correction to the
hydrogen Lamb shift to date. Together with the ongoing measurement of the
proton charge radius at the Paul Scherrer Institute its calculation will bring
theoretical and experimental accuracy for the Lamb shift in atomic hydrogen to
the level of 10^(-7).


title:
The Ds(2317) and Ds(2463) Mesons as Scalar and Axial-Vector Chiralons in
  the Covariant Level-Classification Scheme

abstract:
  The new narrow mesons observed recently in the final states Ds+ pi0 and Ds*+
pi0 are pointed out to be naturally assigned as the ground-state scalar and
axial-vector chiralons in the c sbar system, which would newly appear in the
covariant hadron-classification scheme proposed a few years ago.


title: Scalar Mesons and Chiral States

abstract:
  The essential points and physical backgrounds of the covariant
level-classification scheme, based on U(12)SF * O(3,1)L, are reviewed: This
scheme is extended from the non-relativistic SU(6)SF * O(3)L scheme by
introducing the new SU(2)-spin (rho-spin) degree of freedom, which is necessary
for covariant description of composite hadrons. Our scheme predicts the
existence of new type of chiral mesons and baryons (Chiralons) out of the
conventional SU(6)SF * O(3)L scheme. The sigma nonet is a typical example of
chiralons to be assigned to the q qbar relativistic S-wave state. The new
narrow mesons Ds(2317)/Ds(2463) are naturally assigned as the ground-state
scalar and axial-vector chiralons in the c sbar system.


title: Unfactorizing Polychromatic Penguins

abstract:
  Firstly, I report on a recent work --carried out with T. Hambye and E. de
Rafael-- on how to use the large-Nc expansion to calculate unfactorized
contributions from the strong penguin operators, and their impact on
observables such as epsilon'/epsilon and the Delta I = 1/2 rule. Secondly,
based on work done with M. Golterman, I explain how this calculation allows one
to predict some rather dramatic consequences for quenched QCD. This may help
explain the present discrepancy between lattice and experimental results for
epsilon'/epsilon. The emphasis of this article is put on the explanation of the
method of calculation used, which is fully analytic. This allows one to build
some intuition and understand the role played by the different hadronic scales
in determining the size of the different contributions.


title:
Poincare' invariance constraints on non-relativistic effective field
  theories

abstract:
  We discuss Poincare' invariance in the context of non-relativistic effective
field theories of QCD. We show, in the cases of the HQET and pNRQCD, that the
algebra of the generators of the Poincare' transformations imposes precise
constraints on the form of the Lagrangian. In the case of the HQET they are the
relations formerly obtained by reparametrization invariance.


title: Symmetries in QFT

abstract:
  This document contains notes from the graduate lecture course, "Symmetries in
QFT" given by J.F.Wheater at Oxford University in Hilary term. The course gives
an informal introduction to QFT.


title: Constraints on the Electrical Charge Asymmetry of the Universe

abstract:
  We use the isotropy of the Cosmic Microwave Background to place stringent
constraints on a possible electrical charge asymmetry of the universe. We find
the excess charge per baryon to be $q_{e-p}<10^{-26}e$ in the case of a uniform
distribution of charge, where $e$ is the charge of the electron. If the charge
asymmetry is inhomogeneous, the constraints will depend on the spectral index,
$n$, of the induced magnetic field and range from $q_{e-p}<5\times 10^{-20}e$
($n=-2$) to $q_{e-p}<2\times 10^{-26}e$ ($n\geq 2$). If one could further
assume that the charge asymmetries of individual particle species are not
anti-correlated so as to cancel, this would imply, for photons, $q_\gamma<
10^{-35}e$; for neutrinos, $q_\nu<4\times10^{-35}e$; and for heavy (light) dark
matter particles $q_{\rm dm}<4\times10^{-24}e$ ($q_{\rm dm}<4\times10^{-30}e$).


title: Inhomogeneous Color Superconductivity

abstract:
  We discuss the possibility that in finite density QCD an anisotropic phase is
realized. This case might arise for quarks with different chemical potential
and/or different masses. In this phase crystalline structures may be formed. We
consider this possibility and we describe, in the context of an effective
lagrangian, the corresponding phonons as the Nambu-Goldstone bosons associated
to the breaking of the space symmetries.


title: Pomeron/Odderon Interference in Diffractive Meson Pairs Production

abstract:
  We study Pomeron-Odderon interference effects giving rise to charge and
single-spin asymmetries in diffractive electroproduction of a $\pi^+ \pi^-$
pair. The final state interactions and the role of $f_0$ meson are discussed.
The absence of $f_0$ signal in the charge asymmetry observed by HERMES may be
due to the smalness of its quark component.


title: Transversity and single spin asymmetries

abstract:
  The transverse spin of interacting light quarks is described by two
independent non-perturbative inputs, twist-2 transversity and twist-3
quark-gluon correlators, while for free massive quarks they are related by the
equations of motion. Similar relation emerges also in a model, where
quark-hadron transition is treated in a probabilistic way. The single spin
asymmerty in SIDIS appears due to the interplay of transverity with Collins
fragmentation function, which appears to be of twist 3, when defined in a
Lorentz invariant way.


title: A Coulomb Gauge Model of Mesons

abstract:
  A model of mesons which is based on the QCD Hamiltonian in Coulomb gauge is
presented. The model relies on a novel quasiparticle basis to improve the
reliability of the Fock space expansion. It is also relativistic, yields chiral
pions, and is tightly constrained by QCD (quark masses are the only
parameters). Applications to hidden flavor mesons yield results which are
comparable to phenomenological constituent quark models while revealing the
limitations of such models.


title: Exotic baryons and multibaryons in chiral soliton models

abstract:
  Recently observed exotic baryon resonance with positive strangeness is
discussed. The chiral soliton model, which allowed to predict the mass and
width of this state, predicts also a number of other exotic states, strange and
non-strange, some of them are, probably, observed in experiments. The existence
of exotic multibaryons is expected as well, with positive strangeness or
beauty, and negative charm. The possibility of binding of anticharm and
antibeauty is pointed out.


title: Status of the computation of fBs, fBd, xi and g

abstract:
  Current status of the computation of the neutral B-meson mixing amplitudes,
with particular attention to the heavy-light meson decay constants, is
reviewed. The values for these quantities, as well as for the coupling of the
pion to the lowest doublet of heavy-light mesons, are given.


title: Z' Mediated Flavor Changing Neutral Currents in B Meson Decays

abstract:
  We study the effects of an extra U(1)' gauge boson with flavor changing
couplings with fermion mass eigenstates on certain B meson decays that are
sensitive to such new physics contributions. In particular, we examine to what
extent the current data on B_d -> \phi K, B_d -> \eta' K and B_s -> \mu^+ \mu^-
decays may be explained in such models, concentrating on the example in which
the flavor changing couplings are left-chiral. We find that within reasonable
ranges of parameters, the Z' contribution can readily account for the anomaly
in S_{\phi K_S} but is not sufficient to explain large branching ratio of B_d
-> \eta' K with the same parameter value. S_{\phi K_S} and S_{\eta' K_S} are
seen to be the dominant observables that constrain the extra weak phase in the
model.


title: The $J/\psi DD^*$ vertex

abstract:
  We employ QCD sum rules to calculate the $J/\psi DD^*$ form factors and
coupling constant by studying the three-point $J/\psi D^*D$ correlation
function. We find that the momentum dependence of the form factor depends on
the off-shell meson. We get a value for the coupling which is in agreement with
estimates based on constituent quark model.


title: Inclusive Quarkonium Decays

abstract:
  I review recent progress in the calculation of inclusive quarkonium decays in
the framework of QCD nonrelativistic effective field theories and in relation
to the experimental measurements.


title: $D^0-\bar{D^0}$ Mixing and Rare Charm Decays

abstract:
  We review the current status of flavor-changing neutral currents in the charm
sector. We focus on the standard-model predictions and identify the main
sources of theoretical uncertainties in both charm mixing and rare charm
decays. The potential of these observables for constraining short-distance
physics in the standard model and its extensions is compromised by the presence
of large nonperturbative effects. We examine the possible discovery windows in
which short-distance physics can be tested and study the effects of various
extensions of the standard model. The current experimental situation and future
prospects are reviewed.


title:
On the Charge Asymmetry of the Like-Sign Lepton Pairs Induced by
  $B-\bar{B}$ Production Asymmetry

abstract:
  In Monte Carlo simulation of $pp$ and $pn$ interactions, it is shown that the
charge asymmetry of like-sign lepton pairs can be observed as a manifestation
of $B-\bar{B}$ production asymmetry.
  In this way, the $B-\bar{B}$ production asymmetry could be studied
experimentally without full reconstruction of $B$-mesons.


title: Connecting Polyakov Loops to Hadrons

abstract:
  The order parameter for the pure Yang-Mills phase transition is the Polyakov
loop, which encodes the symmetries of the Z_N center of the SU(N) gauge group.
The physical degrees of freedom of any asymptotically free gauge theory are
hadronic states. Using the Yang-Mills trace anomaly and the exact Z_N symmetry
we show that the transfer of information from the order parameter to hadrons is
complete.


title: Medium Modification of Jet Shapes and Jet Multiplicities

abstract:
  Medium-induced parton energy loss is widely considered to underly the
suppression of high-pt leading hadron spectra in 200 GeV/A Au+Au collisions at
RHIC. Its description implies a characteristic kt-broadening of the subleading
hadronic fragments associated to the hard parton. However, this latter effect
is more difficult to measure and remained elusive so far. Here, we discuss how
it affects genuine jet observables which are accessible at LHC and possibly at
RHIC. We find that the kt-broadening of jet multiplicity distributions provides
a very sensitive probe of the properties of dense QCD matter, whereas the
sensitivity of jet energy distributions is much weaker. In particular, the
sensitive kinematic range of jet multiplicity distributions is almost
unaffected by the high multiplicity background.


title: High Density Effective Theory Confronts the Fermi Liquid

abstract:
  The high density effective theory recently introduced by Hong and Hsu to
describe ultradense relativistic fermionic matter is used to calculate the
tree-level forward scattering amplitude between two particles at the Fermi
surface. While the direct term correctly reproduces that of the underlying
gauge theory, the exchange term has the wrong sign. The physical consequences
are discussed in the context of Landau's theoretical description of the Fermi
liquid.


title: New Strategies to Extract Weak Phases from Neutral B Decays

abstract:
  We discuss new, theoretically clean strategies to determine the angle
$\gamma$ of the unitarity triangle from $B_d\to DK_{S(L)}$, $B_s\to
D\eta^{(')}, D\phi, ...$ decays, and point out that the $B_s\to DK_{S(L)}$ and
$B_d\to D\pi^0, D\rho^0, ...$ modes allow very interesting determinations of
the $B^0_q$--$\bar{B^0_q}$ mixing phases $\phi_s$ and $\phi_d$, respectively.
Their colour-allowed counterparts $B_s\to D_s^{(*)\pm} K^\mp, ...$ and $B_d\to
D^{(*)\pm} \pi^\mp, ...$ also offer new methods to probe $\gamma$.


title: Roy's equations and the pion-pion experimental data

abstract:
  Roy's equations are used to check if the scalar-isoscalar pion-pion
scattering amplitudes fitted to experimental data fulfill crossing symmetry
conditions. It is shown that the amplitudes describing the ``down-flat'' phase
shift solution satisfy crossing symmetry below 1 GeV while the amplitudes
fitted to the "up-flat'' data do not. In this way the long standing "up-down"
ambiguity in the phenomenological determination of the scalar-isoscalar
pion-pion amplitudes has been resolved confirming the independent result of the
recent joint analysis of the pi+pi- and pi0pi0 data.


title: New formalism for QCD parton showers

abstract:
  We present a new formalism for parton shower simulation of QCD jets, which
incorporates the following features: invariance under boosts along jet axes,
improved treatment of heavy quark fragmentation, angular-ordered evolution with
soft gluon coherence, more accurate soft gluon angular distributions, and
better coverage of phase space. It is implemented in the new HERWIG++ event
generator.


title:
Nonfactorizable contributions in B decays to charmonium: the case of
  $B^- \to K^- h_c$

abstract:
  Nonleptonic $B$ to charmonium decays generally show deviations from the
factorization predictions. For example, the mode $B^- \to K^- \chi_{c0}$ has
been experimentally observed with sizeable branching fraction while its
factorized amplitude vanishes. We investigate the role of rescattering effects
mediated by intermediate charmed meson production in this class of decay modes,
and consider $B^- \to K^- h_c$ with $h_c$ the $J^{PC}=1^{+-}$ $\bar c c$ meson.
Using an effective lagrangian describing interactions of pairs of heavy-light
$Q{\bar q}$ mesons with a quarkonium state, we relate this mode to the
analogous mode with $\chi_{c0}$ in the final state. We find ${\cal B}(B^- \to
K^- h_c)$ large enough to be measured at the $B$ factories, so that this decay
mode could be used to study the poorly known $h_c$.


title: Power corrections in models with extra dimensions

abstract:
  We critically revisit the issue of power-law running in models with extra
dimensions. The general conclusion is that, in the absence of any additional
physical principle, the power-corrections tend to depend strongly on the
details of the underlying theory.


title:
The role of double helicity-flip amplitudes in small-angle elastic
  pp-scattering

abstract:
  We asses a role of the double helicity-flip amplitudes in small-angle elastic
pp-scattering and obtain a new unitary bound for the double helicity-flip
amplitude F_2 in elastic pp-scattering at small values of t on the basis of the
U-matrix method of the s-channel unitarization.


title: Vector Mesons and Dence Skyrmion Matter

abstract:
  In our continuing effort to understand hadronic matter at high density, we
have developed a unified field theoretic formalism for dense skyrmion matter
using a single Lagrangian to describe simultaneously both matter and meson
fluctuations and studied in-medium properties of hadrons. Dropping the quartic
Skyrme term, we incorporate into our previous Lagrangian the vector mesons rho
and omega in a form which is consistent with the symmetries of QCD. The results
that we have obtained, reported here, expose a hitherto unsuspected puzzle
associated with the role the omega meson plays at short distance. Since the
omega meson couples to baryon density, it leads to a pseudo-gap scenario for
the chiral symmetry phase transition, which is at variance with standard
scenario of QCD at the phase transition. We find that in the presence of the
omega mesons, the scale-anomaly dilaton field is prevented from developing a
vanishing vacuum expectation value at the chiral restoration, as a consequence
of which the in-medium pion decay constant does not vanish. This seems to
indicate that the omega degree of freedom obstructs the vector manifestation
which is considered to be a generic feature of effective field theories matched
to QCD.


title: Symbolic calculation of multiparticle Feynman amplitudes

abstract:
  Using the newly modified method developed for symbolic evaluation of Feynman
amplitudes we examine two processes $2\to 2$ (including a case of Majorana
fermions) at a tree level. Constructing special polarization basis for spinor
particles, we obtain compact expressions for helicity amplitudes. We present
the regular way for simplification of evaluated symbolic expressions.


title: Aspects of Confinement: a Brief Review

abstract:
  A brief and biased overview of the phenomenon of confinement in QCD is
presented in three parts: (1) the definition of confinement, (2) properties of
confinement, (3) ideas of confinement. The second part chiefly consists of a
brief review of recent lattice computations related to confinement while the
third summarizes some of the current analytical approaches to understanding
confinement. These include the Dyson-Schwinger formalism in Landau gauge,
Hamiltonian QCD in Coulomb gauge, and the vortex picture of confinement.


title: Large mass Q-Qbar production from the Color Glass Condensate

abstract:
  We compute quark-antiquark pair production in the context of the Color Glass
Condensate model for central heavy-ion collisions. The calculation is performed
analytically to leading order in the density of hard sources present in the
projectiles, and is applicable to quarks with a mass large compared to the
saturation momentum. The formulas derived in this paper are compared to
expressions derived in the framework of collinearly factorized perturbative QCD
and in kt factorization models. We comment on the breaking of kt factorization
which occurs beyond leading order in our approach.


title:
Energy and Angular Distribution of Upward UHE Neutrinos and Signals of
  Low Scale Gravity: Role of Tau Decay

abstract:
  We present extensive results and analysis of energy and angular distributions
of diffuse UHE $\nu_{e}$, $\nu_{\mu}$, and $\nu_{\tau}$ fluxes propagated
through earth, with and without augmentation of the standard model interactions
by low scale gravity. With propagated fluxes in hand we estimate event rates in
a $1km^{3}$ detector in ice with characteristics of ICECUBE. We determine that,
at 0.5PeV energy threshold, there is a significant difference in the ratios of
down shower events to upward muon events between the standard model and the low
scale gravity cases with 1TeV and 2TeV mass scales. The same is true for energy
threshold at 5PeV. Though the difference is large in all flux models,
statistical significance of this difference depends on the flux models,
especially at 5PeV and above. Both flavor assumptions, $\nu_{e}$, $\nu_{\mu}$,
$\nu_{\tau}::1$, 2, 0 and $% \nu_{e}$, $\nu_{\mu}$, $\nu_{\tau}::1$, 1, 1, and
all flux models show large differences. Though rates of tagged events are low,
we find that $\nu_{\tau}$ regeneration by $\tau $ decay may play an important
role in disclosing deviations from standard model predictions at energies in
the neighborhood of 1 PeV for 1TeV-scale gravity, for example. We emphasize
those analyses whose sensitivity to new physics is independent of the flux
model assumed.


title: Applicability of Perturbative QCD to Pion Virtual Compton Scattering

abstract:
  We study explicitly the applicability of perturbative QCD (pQCD) to the pion
virtual Compton scattering. It is found that there are central-region
singularities introduced by the QCD running coupling constant, in addition to
the end-point singularities generally existed in other exclusive processes such
as the pion form factor. We introduce a simple technique to evaluate the
contributions from these singularities, so that we can arrive at a judgement
that these contributions will be unharmful to the applicability of pQCD at
certain energy scale, i.e., the ``work point'' which is defined to determine
when pQCD is applicable to exclusive processes. The applicability of pQCD for
different pion distribution amplitudes are explored in detail. We show that
pQCD begins to work at 10 ${GeV}^2$. If we relax our constraint to a weak
sense, the work point may be as low as 4 ${GeV}^2$.


title:
Renormalon Cancellation and Perturbative QCD Potential as a
  Coulomb+Linear Potential

abstract:
  Recently evidence has been found that the perturbative QCD potential agrees
well with phenomenological potentials and lattice computations of the QCD
potential. We review the present status of the perturbative QCD potential and
theoretical backgrounds. We also report our recent analysis which shows
analytically, on the basis of renormalon dominance picture, that the
perturbative QCD potential quickly ``converges'' to a Coulomb-plus-linear form.
The Coulomb-plus-linear potential can be computed systematically as we include
more terms of the perturbative series; up to three-loop running (our current
best knowledge), it shows a convergence towards lattice results. e.g. At
one-loop running, the linear potential is sigma*r with sigma = (2*pi*C_F/beta0)
Lambda_MSbar^2.


title: S-Matrix Elements in General Renormalization Schemes

abstract:
  Starting from the Lehmann-Symanzik-Zimmermann reduction theorem, we provide a
general procedure to extract S-matrix elements from Green functions in
arbitrary renormalization schemes.


title: Chiral Symmetry in Light-front QCD

abstract:
  The definition of chiral transformations in light-front field theory is very
different from the conventional form in equal-time formalism. We study the
consistency of chiral transformations and chiral symmetry in light-front QCD
and derive a complete new light-front axial-vector current for QCD. The
breaking of chiral symmetry in light-front QCD is only associated with helicity
flip interaction between quarks and gluons. Remarkably, the new axial-vector
current does not contain the pion pole part so that the associate chiral charge
smoothly describes pion transitions for various hadronic processes.


title:
Studies of Angular Correlations in the Decays $B^0_s\to J/\psi \phi$ by
  Using the SIMUB Generator

abstract:
  The performance of the method of angular moments on the $\Delta\Gamma_s$
determination from analysis of untagged decays $B^0_s(t),\bar{B}^0_s(t)\to
J/\psi (\to l^+l^-) \phi (\to K^+K^-)$ is examined by using the SIMUB
generator.
  The results of Monte Carlo studies with evaluation of measurement errors are
presented.
  The method of angular moments gives stable results for the estimate of
$\Delta\Gamma_s$ and is found to be an efficient and flexible tool for the
quantitative investigation of the $B^0_s\to J/\psi \phi$ decay.
  The statistical error of the ratio $\Delta\Gamma_s/\Gamma_s$ for values of
this ratio in the interval [0.03, 0.3] was found to be independent on this
value, being 0.015 for $10^5$ events.


title:
Exclusive $B \to (K^*, \rho) \gamma$ decays in the general
  two-Higgs-doublet models

abstract:
  By employing the QCD factorization approach, we calculated the
next-to-leading order new physics contributions to the branching ratios, CP
asymmetries, isospin and U-spin symmetry breaking of the exclusive decays $B
\to V \gamma$ ($V=K^*, \rho$), induced by the charged Higgs penguins in the
general two-Higgs-doublet models. Within the considered parameter space, we
found that (a) the new physics corrections to the observables are generally
small in the model I and model III-A, moderate in model II, but large in model
III-B; (b) from the well measured branching ratios and upper limits, a lower
bound of $\mhp > 200$ GeV in model II was obtained, while the allowed range of
$\mhp$ in model III-B is $ 226 \leq \mhp \leq 293 $ GeV; these bounds are
comparable with those from the inclusive $B \to X_s \gamma$ decay; (c)the NLO
Wilson coefficient $C_7(m_b)$ in model III-B is positive and disfavered by the
measured value of isospin symmetry breaking $\Delta_{0-}^{exp} (K^*\gamma) =
(3.9 \pm 4.8)%$, but still can not be excluded if we take the large errors into
account; (d) the CP asymmetry $\acp(B \to \rho \gamma)$ in model III-B has an
opposite sign with the one in the standard model (SM), which may be used as a
good observable to distinguish the SM from model III-B; (e) the isospin
symmetry breaking $\Delta(\rho\gamma)$ is less than 10% in the region of
$\gamma = [ 40 \sim 70]^\circ$ preferred by the global fit result, but can be
as large as 20 to 40% in the regions of $\gamma \leq 10^\circ$ and $\gamma \geq
120^\circ$. The SM and model III-B predictions for $\Delta(\rho \gamma)$ are
opposite in sign for small or large values of the CKM angles; (f) the U-spin
symmetry breaking $\Delta U(K^*,\rho)$ in the SM and the general
two-Higgs-doublet models is generally small in size: $\sim 10^{-7}$.


title: Littlest Higgs Model and Unitarity Constraints

abstract:
  The Littlest Higgs Model is constrained using the tree-level perturbative
arguments, similar to those employed to obtain the Higgs mass bound. It is
found that the perturbative unitaity violations set in at energy scales $\sim
1.5\chi f$, where $f$ is the analog of pion decay constant and sets the scale
for the masses in the theory and also the strong interaction scale and $\chi$
is a dimensionless parameter which together with $f$ sets the mass scale of
heavy scalars in the theory.


title: Precision Study of Positronium: Testing Bound State QED Theory

abstract:
  As an unstable light pure leptonic system, positronium is a very specific
probe atom to test bound state QED. In contrast to ordinary QED for free
leptons, the bound state QED theory is not so well understood and bound state
approaches deserve highly accurate tests. We present a brief overview of
precision studies of positronium paying special attention to uncertainties of
theory as well as comparison of theory and experiment. We also consider in
detail advantages and disadvantages of positronium tests compared to other QED
experiments.


title: Late Reheating, Hadronic Jets and Baryogenesis

abstract:
  If inflaton couples very weakly to ordinary matter the reheating temperature
of the universe can be lower than the electroweak scale. In this letter we show
that the late reheating occurs in a highly non-uniform way, within narrow areas
along the jets produced by ordinary particles originated from inflaton decays.
Depending on inflaton mass and decay constant, the initial temperature inside
the lumps of the overheated plasma may be large enough to trigger the
unsuppressed sphaleron processes with baryon number non-conservation, allowing
for efficient local electroweak baryogenesis.


title:
Systematic study related to the role of initial impurities and
  irradiation rates in the formation and evolution of complex defects in
  silicon for detectors in HEP experiments

abstract:
  The influence of oxygen and carbon impurities on the concentrations of
defects in silicon for detector uses, in complex fields of radiation,
characteristic to high energy physics experiments, is investigated in the frame
of the quantitative phenomenological model developed previously by the authors
and extended in the present paper. Continuous irradiation conditions are
considered, simulating realistically the environments for these experiments.
The generation rate of primary defects is calculated starting from the
projectile - silicon interaction and from the recoil energy redistribution in
the lattice. The mechanisms of formation of complex defects are explicitly
analysed. Vacancy-interstitial annihilation, interstitial and vacancy migration
to sinks, divacancy, vacancy- and interstitial-impurity complex formation and
decomposition are considered. Oxygen and carbon impurities present in silicon
could monitor the concentration of all stable defects, due to their interaction
with vacancies and interstitials. Their role in the mechanisms of formation and
decomposition of the following stable defects: V_2, VO, V_2O, C_i, C_iO_i,
C_iC_s and VP, is studied. The model predictions cover a generation primary
rate of defects between 10^2 pairs/cm3/s and 10^{11} pairs/cm3/s, and could be
a useful clue in obtaining harder materials for detectors for space missions,
at the new generation of accelerators, as, e.g. LHC, Super-LHC and Eloisatron,
or for industrial applications.


title: Dual superconductor models of color confinement

abstract:
  The lectures, delivered at ECT (European Centre for Theoretical Studies in
Nuclear Physics and Related Areas) in Trento (Italy) in 2002 and 2003, are
addressed to physicists who wish to acquire a minimal background to understand
present day attempts to model the confinement of quantum chromo-dynamics (QCD)
in terms of dual superconductors. The lectures focus more on the models than on
attempts to derive them from QCD. They discuss the Dirac theory of magnetic
monopoles, the world sheet swept out by Dirac strings, deformations of Dirac
strings and charge quantization, gauge fields associated to the field tensor
and to the dual field tensor, the Landau-Ginzburg (Abelian Higgs) model of a
dual superconductor, the flux tube joining two equal and opposite
color-electric charges, the Abrikosov-Nielsen-Olesen vortex, the divergencies
of the London limit, the comparison of the calculated flux tube and string
tension with lattice data, duality transformations and the use of Kalb-Ramond
fields, the two-potential Zwanziger formalism, abelian gauge fixing and abelian
projection, the occurence of monopoles in an abelian gauge, the maximal abelian
gauge, and the confinement of static SU(3) color charges.


title: Dark Matter, Muon g-2 and Other SUSY Constraints

abstract:
  Recent developments constraining the SUSY parameter space are reviewed within
the framework of SUGRA GUT models. The WMAP data is seen to reduce the error in
the density of cold dark matter by about a factor of four, implying that the
lightest stau is only 5 -10 GeV heavier than the lightest neutralino when m_0,
m_{1/2} < 1 TeV. The CMD-2 re-analysis of their data has reduced the
disagreement between the Standard Model prediction and the Brookhaven
measurement of the muon magnetic moment to 1.9 sigma, while using the tau decay
data plus CVC, the disagreement is 0.7 sigma. (However, the two sets of data
remain inconsistent at the 2.9 sigma level.) The recent Belle and BABAR
measurements of the B -> phi K CP violating parameters and branching ratios are
discussed. They are analyzed theoretically within the BBNS improved
factorization method. The CP parameters are in disagreement with the Standard
Model at the 2.7 sigma level, and the branching ratios are low by a factor of
two or more over most of the parameter space. It is shown that both anomalies
can naturally be accounted for by adding a non-universal cubic soft breaking
term at M_G mixing the second and third generations.


title: The finite mass calculations for Gamma Gamma --> L+ L- Gamma process

abstract:
  The process $\gamma\gamma\to l^+ l^- \gamma$ will be used for the photon
beams luminosity measurement when the total angular momentum of colliding
photons equals zero. The previous studies of this process were performed in the
chiral limit. But the mass contribution should be taken into account.


title:
Pseudoscalar Higgs boson production associated with a single bottom
  quark at hadron colliders

abstract:
  We compute the complete next-to-leading order (NLO) SUSY-QCD corrections for
the associated production of a pseudoscalar Higgs boson with a bottom quark via
bottom-gluon fusion at the CERN Large Hadron Collider (LHC) and the Fermilab
Tevatron. We find that the NLO QCD correction in the MSSM reaches $40%\sim50%$
at the LHC and $45%\sim80%$ at the Tevatron in our chosen parameter space.