title:
Casimir Energies due to Matter Fields in $T^{2}$ and $T^{2}/Z_{2}$
  Compactifications

abstract:
  We calculate the Casimir energies due to matter fields with various boundary
conditions along two compact directions in $T^{2}$ compactification. We discuss
whether the Casimir energies generate attractive or repulsive forces. On the
theories with extra dimensions, the Casimir energy plays a crucial role in the
mechanism for stabilizing the size of extra dimensions. Finally we argue a
procedure of the application to $Z_{2}$ orbifold.


title: The kinetic equation for the quark Wigner function in strong gluon field

abstract:
  The Vlasov type quantum kinetic equation for deconfined quarks in strong
quasi-classical gluon field is derived in the covariant single-time formalism.
The equations system for the Wigner function components is obtained as a result
of spinor and color decomposition. The field-free and vacuum solutions of the
kinetic equation are found, and the conservation laws are derived. The
flux-tube configuration of gluon field is discussed in detail.


title: Vertex diagrams for the QED form factors at the 2-loop level

abstract:
  We carry out a systematic investigation of all the 2-loop integrals occurring
in the electron vertex in QED in the continuous $D$-dimensional regularization
scheme, for on-shell electrons, momentum transfer $t=-Q^2$ and finite squared
electron mass $m_e^2=a$. We identify all the Master Integrals (MI's) of the
problem and write the differential equations in $Q^2$ which they satisfy. The
equations are expanded in powers of $\epsilon = (4-D)/2$ and solved by the
Euler's method of the variation of the constants. As a result, we obtain the
coefficients of the Laurent expansion in $\epsilon$ of the MI's up to zeroth
order expressed in close analytic form in terms of Harmonic Polylogarithms.


title: Bulk Gauge Fields in Warped Space and Localized Supersymmetry Breaking

abstract:
  We consider five dimensional supersymmetric warped scenarios in which the
Standard Model quark and lepton fields are localized on the ultraviolet brane,
while the Standard Model gauge fields propagate in the bulk. Supersymmetry is
assumed to be broken on the infrared brane. The relative sizes of supersymmetry
breaking effects are found to depend on the hierarchy between the infrared
scale and the weak scale. If the infrared scale is much larger than the weak
scale the leading supersymmetry breaking effect on the visible brane is given
by gaugino mediation. The gaugino masses at the weak scale are proportional to
the square of the corresponding gauge coupling, while the dominant contribution
to the scalar masses arises from logarithmically enhanced radiative effects
involving the gaugino mass that are cutoff at the infrared scale. While the LSP
is the gravitino, the NLSP which is the stau is stable on collider time scales.
If however the infrared scale is close to the weak scale then the effects of
hard supersymmetry breaking operators on the scalar masses can become
comparable to those from gaugino mediation. These operators alter the relative
strengths of the couplings of gauge bosons and gauginos to matter, and give
loop contributions to the scalar masses that are also cutoff at the infrared
scale. The gaugino masses, while exhibiting a more complicated dependence on
the corresponding gauge coupling, remain hierarchical and become proportional
to the corresponding gauge coupling in the limit of strong supersymmetry
breaking. The scalar masses are finite and a loop factor smaller than the
gaugino masses. The LSP remains the gravitino.


title: Higgs studies in ACFA Linear Collider Working Group

abstract:
  We report the important topics in ACFA report as well as the recent progress
in the ACFA Higgs working group.


title:
Open problems in forward-backward multiplicity correlations in
  hadron-hadron collisions in the TeV region

abstract:
  Continuing previous work on forward-backward multiplicity correlation
properties in proton-proton collisions in the framework of the weighted
superposition model of two components (each one described by a negative
binomial multiplicity distribution) with the addition of the leakage parameter
which controls clan spreading from one hemisphere to the opposite one, we
examine E735 data on the c.m. energy dependence of the total correlation
strength and of the forward variance at fixed total multiplicity. A comparison
with the Chou-Yang approach to the problem is presented and extrapolations of
the mentioned variables at LHC c.m. energy in possible scenarios in the new
energy domain are discussed.


title: The QCD factorization in $B \to DKK$ decays

abstract:
  A study of hadron pair production mechanism is motivated by the recent
observed decays $\bar B^0\to D^{(*)+}K^-K^0$. One novel phenomenon is threshold
enhancement of the kaon pair production. We show that these decays in the heavy
quark mass limit can be factorized into a generalized form. The new
non-perturbative quantity is the generalized distribution amplitude which
describes how a quark-antiquark pair transmits into the hadron pair. A proof of
factorization of $\bar B^0\to D^{(*)+}K^-K^0$ decays to all-orders is performed
by using the soft-collinear effective theory. The phenomenological application
is discussed in brief.


title: b \bar b b\bar b production in proton-nucleus collisions at the LHC

abstract:
  A sizable rate of events, with several pairs of $b$-quarks produced
contemporarily by multiple parton interactions, may be expected at very high
energies as a consequence of the large parton luminosities. The production
rates are further enhanced in hadron-nucleus reactions, which may represent a
convenient tool to study the phenomenon. We compare the different contributions
to $b{\bar b}b{\bar b}$ production, due to single and double parton
scatterings, in collisions of protons with nuclei at the CERN-LHC.


title: Effective theories and constraints on new phyhsics

abstract:
  Anomalous moments of the top quark arises from one loop corrections to the
vertices $\bar t t g$ and $\bar t t \gamma$. We study these anomalous couplings
in different frameworks: effective theories, Standard Model and 2HDM. We use
available experimental results in order to get bounds on these anomalous
couplings.


title: QCD-Instantons and Saturation at Small x

abstract:
  We briefly report on the contribution of QCD-instantons to the phenomenon of
saturation in deep-inelastic scattering (DIS) at small Bjorken-x. The
explicitly known instanton gauge field serves as a concrete realization of an
underlying non-perturbative saturation mechanism associated with strong
classical fields. Two independent strategies were pursued, with consistent
results: On the one hand, an approach starting from instanton-perturbation
theory was considered and on the other hand, the scattering of a Wilson loop in
an instanton gauge field background. In both cases, the conspicuous, intrinsic
instanton size scale <rho> ~ 0.5 fm, as known from the lattice, turns out to
determine the saturation scale.


title: Multiparton scattering at the LHC

abstract:
  The large parton flux at high energy gives rise to events where different
pairs of partons interact contemporarily with large momentum exchange. A main
effect of multiple parton interactions is to generate events with many jets at
relatively large transverse momenta. The large value of the heavy quarks
production cross section may however give also rise a sizable rate of events
with several $b$-quarks produced. We summarize the main features of multiparton
interactions and make some estimate of the inclusive cross section to produce
two $b{\bar b}$ pairs within the acceptance of the ALICE detector.


title: Quasi-fixed point scenario in the modified NMSSM

abstract:
  The simplest extension of the MSSM that does not contradict LEP II
experimental bound on the lightest Higgs boson mass at $\tan\beta\sim 1$ is the
modified Next-to-Minimal Supersymmetric Standard Model (MNSSM). We investigate
the renormalization of Yukawa couplings and soft SUSY breaking terms in this
model. The possibility of $b$-quark and $\tau$-lepton Yukawa coupling
unification at the Grand Unification scale $M_X$ is studied. The particle
spectrum is analysed in the vicinity of the quasi-fixed point where the
solutions of renormalization group equations are concentrated at the
electroweak scale.


title: Are B to PI K CP-asymmetries quantized ?

abstract:
  Search for patterns in the numerous B-decay modes now available is necessary
in order to test the Cabibbo-Kobayashi-Maskawa theory of CP-violation. In
particular, the well-structured pattern of B to PI K branching ratios may lead
to a quantized spectrum for direct CP-asymmetries, providing in this way a
rather unique opportunity to discriminate between strong final state
interaction models.


title: Vacuum engineering at a photon collider?

abstract:
  The aim of this paper is twofold: to provide a rather detailed and
self-contained introduction into the physics of the Disoriented Chiral
Condensate (DCC) for the photon (and linear) collider community, and to
indicate that such physics can be searched and studied at photon colliders.
Some side tracks are also occasionally followed during the exposition, if they
lead to interesting vistas. For gourmets, the Baked Alaska recipe is given in
the appendix.


title:
Electroproduction of vector mesons - factorization of end-point
  contributions

abstract:
  The end-point contributions in the quark longitudinal momentum fraction of
the virtual photon ($\gamma^*$) to vector meson ($V$) impact factor to the
diffractive electroproduction amplitude can be factorized in terms of a
generalized parton evolution of the target parton distribution. The result is
used to model the helicity amplitudes $\gamma^* p \to V p$ in terms of small
$x$ generalized parton distributions.


title:
Isospin Chemical Potential and the QCD Phase Diagram at Nonzero
  Temperature and Baryon Chemical Potential

abstract:
  We use the Nambu--Jona-Lasinio model to study the effects of the isospin
chemical potential on the QCD phase diagram at nonzero temperature and baryon
chemical potential. We find that the phase diagram is qualitatively altered by
a small isospin chemical potential. There are two first order phase transitions
that end in two critical endpoints, and there are two crossovers at low baryon
chemical potential. These results have important consequences for systems where
both baryon and isospin chemical potentials are nonzero, such as heavy ion
collision experiments. Our results are in complete agreement with those
recently obtained in a Random Matrix Model.


title: Sleptogenesis

abstract:
  We propose that the observed baryon asymmetry of the Universe can naturally
arise from a net asymmetry generated in the sleptonic sector at fairly low
reheat temperatures. The best candidate is indeed the right-handed sneutrino.
The initial asymmetry in the sneutrino sector can be produced from the decay of
the inflaton, and is subsequently transferred into the Standard Model (s)lepton
doublet via the decay of the sneutrino. The active sphalerons then reprocess
the leptonic asymmetry into the baryonic asymmetry. The marked feature of this
scenario is that the lepton asymmetry is decoupled from the neutrino Yukawa
sector. We exhibit that our scenario can be embedded within models which seek
the origin of a tiny mass for neutrinos.


title: Towards a standard jet definition

abstract:
  In a simulated measurement of the $W$-boson mass, evaluation of Fisher's
information shows the optimal jet definition to be physically equivalent to the
$k_\mathrm{T}$ algorithm while being much faster at large multiplicities.


title:
Charmonium production in relativistic proton-nucleus collisions : What
  will we learn from the negative x_F region ?

abstract:
  We study the nuclear medium effects on the $c\bar{c}$ time evolution and
charmonium production, in a relativistic proton-nucleus collision. In
particular, we focus on the fragmentation region of the nucleus where the
formation length of the charmonium mesons is shorter than the size of the
nucleus. Little is known on the nuclear effects in this region. We use a
quantum-mechanical model which includes a realistic potential for the
$c\bar{c}$ system and an imaginary potential to describe the collisions of the
$c\bar{c}$ with the nucleons. The imaginary potential introduces a transition
amplitude among the charmonium states and produces an interference pattern on
the charmonium survival probability, which is particulartly important for
$\psi'$. Our results on the suppression factors are compared with data from the
NA50 and E866/NuSea Collaborations. Predictions are given for the suppression
of $J/\psi,~\psi',~\chi_c$ as a function of the nuclear mass and in the
negative $x_F$ region, where data will be available soon.


title:
1/Nc corrections to the SU(4)_c symmetry for L=1 baryons: The Three
  Towers

abstract:
  In the large Nc limit, the mass spectrum of the L=1 orbitally excited baryons
N* has a very simple structure, with states degenerate in pairs of spins
J=(1/2,3/2), (3/2,5/2), corresponding to irreducible representations (towers)
of the contracted SU(4)_c symmetry group. The mixing angles are completely
determined in this limit. Using a mass operator approach, we study 1/Nc
corrections to this picture, pointing out a four-fold ambiguity in the
correspondence of the observed baryons with the large Nc states. For each of
the four possible assignments, we fit the coefficients of the quark operators
contributing to the mass spectrum to O(Nc^{-1}). We comment on the implications
of our results for the constituent quark model description of these states.


title: Spin Effects in Two Quark System and Mixed States

abstract:
  Based on the numeric solution of a system of coupled channels for vector
mesons ($S$- and $D$-waves mixing) and for tensor mesons ($P$- and $F$-waves
mixing) mass spectrum and wave functions of a family of vector mesons
$q\bar{q}$ in triplet states are obtained. The calculations are performed using
a well known Cornell potential with a mixed Lorentz-structure of the
confinement term. The spin-dependent part of the potential is taken from the
Breit-Fermi approach. The effect of singular terms of potential is considered
in the framework of the perturbation theory and by a configuration interaction
approach (CIA), modified for a system of coupled equations. It is shown that
even a small contribution of the $D$-wave to be very important at the
calculation of certain characteristics of the meson states.


title:
Electroweak radiative corrections to single Higgs-boson production in
  e+e- annihilation

abstract:
  We have calculated the complete electroweak O(alpha) radiative corrections to
the single Higgs-boson production processes e+ e- --> nu_l anti-nu_l H
(l=e,mu,tau) in the electroweak Standard Model. Initial-state radiation beyond
O(alpha) is included in the structure-function approach. The calculation of the
corrections is briefly described, and numerical results are presented for the
total cross section. In the G_mu scheme, the bulk of the corrections is due to
initial-state radiation, which affects the cross section at the level of -7% at
high energies and even more in the ZH threshold region. The remaining bosonic
and fermionic corrections are at the level of a few per cent. The confusing
situation in the literature regarding differing results for the fermionic
corrections to this process is clarified.


title:
On double $1^{--}$ charmonium production through two-photon $\e^+ e^-$
  annihilation at $\sqrt{s}=10.6 GeV$

abstract:
  Recent measurements of the Belle Collaboration of the exclusive production of
two charmonia in the $e^+e^-$ annihilation differ substantially from
theoretical predictions. Recently it was suggested that a significant part of
this discrepancy can be explained by the process $e^2e^- --> 2J/psi$ and value
for its cross-section was published. In this paper it is shown, that these
results are incorrect and the values for the cross-sections of the production
of different vector charmonia are presented.


title: Threshold Effects and Lorentz Symmetry

abstract:
  Evidence on the violation of Lorentz symmetry arises from the observation of
cosmic rays with energies beyond the GZK cutoff, $E_{GZK} \simeq 4 \times
10^{19} eV$, from the apparent transparency of the Universe to the propagation
of high energy gamma radiation and from the stability of pions in air showers.
These three paradoxes can be explained through deformations of the relativistic
dispersion relation. Theoretical ideas aimed to understand how Lorentz symmetry
may be broken and phenomenologically interesting deformations of the
relativistic dispersion relation may arise are briefly discussed.


title: On the Dipole Picture in the Nonforward Direction

abstract:
  We calculate, for nonzero momentum transfer, the dipole formula for the high
energy behaviour of elastic and quasielastic scattering of a virtual photon. We
obtain an expression of the nonforward photon impact factor and of the
nonforward photon wave function, and we give a physical interpretation.


title: Non-perturbative Aspects of Schwinger-Dyson Equations

abstract:
  Schwinger-Dyson equations (SDEs) provide a natural staring point to study
non-perturbative phenomena such as dynamical chiral symmetry breaking in gauge
field theories. We briefly review this research in the context of quenched
quantum electrodynamics (QED) and discuss the advances made in the gradual
improvement of the assumptions employed to solve these equations. We argue that
these attempts render the corresponding studies more and more reliable and
suitable for their future use in the more realistic cases of unquenched QED,
quantum chromodynamics (QCD) and models alternative to the standard model of
particle physics.


title: Cubic order for spatial 't Hooft loop in hot QCD

abstract:
  Spatial 't Hooft loops of strength k measure the qualitative change in the
behaviour of electric colour flux in confined and deconfined phase of SU(N)
gauge theory. They show an area law in the deconfined phase, known analytically
to two loop order with a ``k-scaling'' law k(N-k).
  In this paper we compute the O(g^3) correction to the tension.
  It is due to neutral gluon fields that get their mass through interaction
with the wall. The simple k-scaling is lost in cubic order.
  The generic problem of non-convexity shows up in this order.
  The result for large N is explicitely given.


title:
Multiple Parton Scattering in Nuclei: Beyond Helicity Amplitude
  Approximation

abstract:
  Multiple parton scattering and induced parton energy loss in deeply inelastic
scattering (DIS) off heavy nuclei is studied within the framework of
generalized factorization in perturbative QCD with a complete calculation
beyond the helicity amplitude (or soft bremsstrahlung) approximation. Such a
calculation gives rise to new corrections to the modified quark fragmentation
functions. The effective parton energy loss is found to be reduced by a factor
of 5/6 from the result of helicity amplitude approximation.


title: Probe Initial Parton Density and Formation Time via Jet Quenching

abstract:
  Medium modification of jet fragmentation function due to multiple scattering
and induced gluon radiation leads directly to jet quenching or suppression of
leading particle distribution from jet fragmentation. One can extract an
effective total parton energy loss which can be related to the total transverse
momentum broadening. For an expanding medium, both are shown to be sensitive to
the initial parton density and formation time. Therefore, one can extract the
initial parton density and formation time from simultaneous measurements of
parton energy loss and transverse momentum broadening. Implication of the
recent experimental data on effects of detailed balance in parton energy loss
is also discussed.


title: Gauge Symmetry in Fokker-Planck dynamics

abstract:
  Using a Galilean metric approach, based in an embedding of the Euclidean
space into a (4+1)-Minkowski space, we analyze a gauge invariant Lagrangian
associated with a Riemannian manifold R, with metric g. With a specific choice
of the gauge condition, the Euler-Lagrange equations are written covariantly in
R, and then the Fokker-Planck equation is derived, such that the drift and the
diffusion terms are obtained from g. The analysis is carried out for both,
abelian and non abelian symmetries, and an example with the su(2) symmetry is
presented.


title: Hadronic Charmed Meson Decays Involving Axial Vector Mesons

abstract:
  Cabibbo-allowed charmed meson decays into a pseudoscalar meson and an
axial-vector meson are studied. The charm to axial-vector meson transition form
factors are evaluated in the Isgur-Scora-Grinstein-Wise quark model. The dipole
momentum dependence of the $D\to K$ transition form factor and the presence of
a sizable long-distance $W$-exchange are the two key ingredients for
understanding the data of $D\to \bar Ka_1$. The $K_{1A}-K_{1B}$ mixing angle of
the strange axial-vector mesons is found to be $\approx \pm37^\circ$ or
$\pm58^\circ$ from $\tau\to K_1\nu_\tau$ decays. The study of $D\to
K_1(1270)\pi, K_1(1400)\pi$ decays excludes the positive mixing-angle
solutions. It is pointed out that an observation of the decay $D^0\to
K_1^-(1400)\pi^+$ at the level of $5\times 10^{-4}$ will rule out
$\theta\approx -37^\circ$ and favor the solution $\theta\approx -58^\circ$.
Though the decays $D^0\to \bar K_1^0\pi^0$ are color suppressed, they are
comparable to and even larger than the color-allowed counterparts: $\bar
K_1^0(1270)\pi^0\sim K_1^-(1270)\pi^+$ and $\bar K_1^0(1400)\pi^0>
K_1^-(1400)\pi^+$. The finite width effect of the axial-vector resonance is
examined. It becomes important for $a_1(1260)$ in particular when its width is
near 600 MeV.


title: Simulation of Atmospheric Muon and Neutrino Fluxes with CORSIKA

abstract:
  The fluxes of atmospheric muons and neutrinos are calculated by a three
dimensional Monte Carlo simulation with the air shower code CORSIKA using the
hadronic interaction models DPMJET, VENUS, GHEISHA, and UrQMD. For the
simulation of low energy primary particles the original CORSIKA has been
extended by a parametrization of the solar modulation and a microscopic
calculation of the directional dependence of the geomagnetic cut-off functions.
An accurate description for the geography of the Earth has been included by a
digital elevation model, tables for the local magnetic field in the atmosphere,
and various atmospheric models for different geographic latitudes and annual
seasons. CORSIKA is used to calculate atmospheric muon fluxes for different
locations and the neutrino fluxes for Kamioka. The results of CORSIKA for the
muon fluxes are verified by an extensive comparison with recent measurements.
The obtained neutrino fluxes are compared with other calculations and the
influence of the hadronic interaction model, the geomagnetic cut-off and the
local magnetic field on the neutrino fluxes is investigated.


title: Gluon distributions in nuclei at small x: guidance from different models

abstract:
  Different approaches to gluon shadowing at small x are reviewed. Some
available results relevant for RHIC and LHC are compared.


title: Renormalizability of Phi-derivable approximations in scalar phi^4 theory

abstract:
  We discuss the renormalizability of Phi-derivable approximations in scalar
phi^4 theory in four dimensions. The formalism leads to self-consistent
equations for the 2-point and the 4-point functions which are plagued by
ultraviolet divergences. Through a detailed analysis of the one and two-loop
self-energy skeletons, we show that both equations can be renormalized
simultaneously and determine the corresponding counterterms. These insure the
elimination of ultraviolet divergences both at zero and finite temperature.


title: Spectral quark model and low-energy hadron phenomenology

abstract:
  We propose a spectral quark model which can be applied to low energy hadronic
physics. The approach is based on a generalization of the Lehmann
representation of the quark propagator. We work at the one-quark-loop level.
Electromagnetic and chiral invariance are ensured with help of the gauge
technique which provides particular solutions to the Ward-Takahashi identities.
General conditions on the quark spectral function follow from natural physical
requirements. In particular, the function is normalized, its all positive
moments must vanish, while the physical observables depend on negative moments
and the so-called log-moments. As a consequence, the model is made finite,
dispersion relations hold, chiral anomalies are preserved, and the twist
expansion is free from logarithmic scaling violations, as requested of a
low-energy model. We study a variety of processes and show that the framework
is very simple and practical. Finally, incorporating the idea of vector-meson
dominance, we present an explicit construction of the quark spectral function
which satisfies all the requirements. The corresponding momentum representation
of the resulting quark propagator exhibits only cuts on the physical axis, with
no poles present anywhere in the complex momentum space. The momentum-dependent
quark mass compares very well to recent lattice calculations. A large number of
predictions and relations can be deduced from our approach for such quantities
as the pion light-cone wave function, non-local quark condensate, pion
transition form factor, pion valence parton distribution function, etc.


title: Searching for a light Fermiophobic Higgs Boson at the Tevatron

abstract:
  We propose new production mechanisms for light fermiophobic Higgs bosons
($h_f$) with suppressed couplings to vector bosons ($V$) at the Fermilab
Tevatron. These mechanisms (e.g. $qq'\to H^\pm h_f$) are complementary to the
conventional process $qq'\to Vh_f$, which suffers from a strong suppression of
$1/\tan^2\beta$ in realistic models with a $h_f$. The new mechanisms extend the
coverage at the Tevatron Run II to the larger $\tan\beta$ region, and offer the
possibility of observing new event topologies with up to 4 photons.


title:
A Kinematically Complete Measurement of the Proton Structure Function F2
  in the Resonance Region and Evaluation of Its Moments

abstract:
  We measured the inclusive electron-proton cross section in the nucleon
resonance region (W < 2.5 GeV) at momentum transfers Q**2 below 4.5 (GeV/c)**2
with the CLAS detector. The large acceptance of CLAS allowed for the first time
the measurement of the cross section in a large, contiguous two-dimensional
range of Q**2 and x, making it possible to perform an integration of the data
at fixed Q**2 over the whole significant x-interval. From these data we
extracted the structure function F2 and, by including other world data, we
studied the Q**2 evolution of its moments, Mn(Q**2), in order to estimate
higher twist contributions. The small statistical and systematic uncertainties
of the CLAS data allow a precise extraction of the higher twists and demand
significant improvements in theoretical predictions for a meaningful comparison
with new experimental results.


title: Numerical evaluation of a two loop diagram in the cutoff regularization

abstract:
  The sunset diagram of $\lambda\phi^4$ theory is evaluated numerically in
cutoff scheme and a nonzero finite term (in accordance with dimensional
regularization (DR) result) is found in contrast to published calculations.
This finding dramatically reduces the critical couplings for symmetry breaking
in the two loop effective potential discussed in our previous work.


title: Possible evidence of extended objects inside the proton

abstract:
  Recent experimental determinations of the Nachtmann moments of the inelastic
structure function of the proton F2p(x, Q**2), obtained at Jefferson Lab, are
analyzed for values of the squared four-momentum transfer Q**2 ranging from ~
0.1 to ~ 2 (GeV/c)**2. It is shown that such inelastic proton data exhibit a
new type of scaling behavior and that the resulting scaling function can be
interpreted as a constituent form factor consistent with the elastic nucleon
data. These findings suggest that at low momentum transfer the inclusive proton
structure function originates mainly from the elastic coupling with extended
objects inside the proton. We obtain a constituent size of ~ 0.2 - 0.3 fm.


title: Heavy quark studies with nuclear emulsions

abstract:
  Emulsions have started particle physics with the discovery of natural
radioactivity by Becquerel in 1896. The development of the ``nuclear
emulsions'' made it possible to detect tracks of single particle and to perform
detailed measurements of their interactions. The discovery of the pion in 1947
was the first, spectacular demonstration of their unique features for the
direct observation of the production and decay of short-lived particles, with
negligible or very low background. In particular, these features are now
exploited for studies of heavy quark physics in experiments where nuclear
emulsions are combined with electronic detectors and profit is taken of the
remarkable technological progress in automated analysis. In these experiments,
neutrinos provide a selective probe for specific quark flavors. Interesting
results on charm production and decay are expected in the very near future.


title: Supersymmetric Effects in Deep Inelastic Neutrino-Nucleus Scattering

abstract:
  We compute the supersymmetric (SUSY) contributions to neutrino
(antineutrino)-nucleus deep inelastic scattering in the Minimal Supersymmetric
Standard Model (MSSM). We consider the ratio of neutral current to charged
current cross sections, $R_{\nu}$ and $R_{\bar \nu}$, and compare with the
deviations of these quantities from the Standard Model predictions implied by
the recent NuTeV measurement. After performing a model-independent analysis, we
find that SUSY loop corrections generally have the opposite sign from the NuTeV
anomaly. We discuss one scenario in which a right-sign effect arises, and show
that it is ruled out by other precision data. We also study for R
parity-violating (RPV) contributions. Although RPV effects could, in principle,
reproduce the NuTeV anomaly, such a possibility is also ruled out by other
precision electroweak measurements.


title: QCD phase diagram at small densities from simulations with imaginary mu

abstract:
  We review our results for the QCD phase diagram at baryonic chemical
potential mu_B \leq pi T. Our simulations are performed with an imaginary
chemical potential mu_I for which the fermion determinant is positive. For 2
flavors of staggered quarks, we map out the phase diagram and identify the
pseudo-critical temperature T_c(mu_I). For mu_I/T \leq pi/3, this is an
analytic function, whose Taylor expansion is found to converge rapidly, with
truncation errors far smaller than statistical ones. The truncated series may
then be continued to real mu, yielding the corresponding phase diagram for mu_B
\lsim 500 MeV. This approach provides control over systematics and avoids
reweighting. We outline our strategy to find the (2+1)-flavor critical point.


title:
The Complementarity of Eastern and Western Hemisphere Long-Baseline
  Neutrino Oscillation Experiments

abstract:
  We present a general formalism for extracting information on the fundamental
parameters associated with neutrino masses and mixings from two or more long
baseline neutrino oscillation experiments. This formalism is then applied to
the current most likely experiments using neutrino beams from the Japan Hadron
Facility (JHF) and Fermilab's NuMI beamline. Different combinations of muon
neutrino or muon anti-neutrino running are considered. To extract the type of
neutrino mass hierarchy we make use of the matter effect. Contrary to naive
expectation, we find that both beams using neutrinos is more suitable for
determining the hierarchy provided that the neutrino energy divided by baseline
($E/L$) for NuMI is smaller than or equal to that of JHF. Whereas to determine
the small mixing angle, $\theta_{13}$, and the CP or T violating phase
$\delta$, one neutrino and the other anti-neutrino is most suitable. We make
extensive use of bi-probability diagrams for both understanding and extracting
the physics involved in such comparisons.


title:
T-violation in flavour oscillations as a test for relativity principles
  at a neutrino factory

abstract:
  We study the effects of violation of the equivalence principle (VEP) or
violation of Lorentz invariance (LIV) in the neutrino sector on the asymmetry
between T-conjugate oscillation probabilities, $\Delta P_T \equiv
P(\nu_{\alpha} \to \nu_{\beta}) - P(\nu_{\beta} \to \nu_{\alpha})$, in a
three-flavour framework. We find that additional mixing due to these
mechanisms, while obeying all present bounds, can lead to an observable
enhancement, suppression, and/or sign change in $\Delta P_T$ for the preferred
energies and baselines of a neutrino factory. The measurement of this asymmetry
can be used to establish a new upper limit of order $10^{-26}$ on VEP or LIV in
the $(\nu_e, \nu_\mu)$ and $(\nu_e, \nu_\tau)$ sectors.


title: T-violation tests for relativity principles

abstract:
  We consider the implications of a violation of the equivalence principle or
of Lorentz invariance in the neutrino sector for the T-asymmetry $\Delta P_T
\equiv P(\nu_{\alpha} \to \nu_{\beta}) - P(\nu_{\beta} \to \nu_{\alpha})$ in a
three-flavour framework. We find that additional mixing due to these
mechanisms, while obeying all present bounds, can lead to a substantial
enhancement, suppression, and/or sign change in $\Delta P_T$ for the preferred
energies and baselines of a neutrino factory. This in turn allows for the
possibility of improving existing constraints by several orders of magnitude.


title:
Angular Conditions,Relations between Breit and Light-Front Frames, and
  Subleading Power Corrections

abstract:
  We analyze the current matrix elements in the general collinear (Breit)
frames and find the relation between the ordinary (or canonical) helicity
amplitudes and the light-front helicity amplitudes. Using the conservation of
angular momentum, we derive a general angular condition which should be
satisfied by the light-front helicity amplitudes for any spin system. In
addition, we obtain the light-front parity and time-reversal relations for the
light-front helicity amplitudes. Applying these relations to the spin-1 form
factor analysis, we note that the general angular condition relating the five
helicity amplitudes is reduced to the usual angular condition relating the four
helicity amplitudes due to the light-front time-reversal condition. We make
some comments on the consequences of the angular condition for the analysis of
the high-$Q^2$ deuteron electromagnetic form factors, and we further apply the
general angular condition to the electromagnetic transition between spin-1/2
and spin-3/2 systems and find a relation useful for the analysis of the
N-$\Delta$ transition form factors. We also discuss the scaling law and the
subleading power corrections in the Breit and light-front frames.


title:
Jet quenching and event-wise mean-pt fluctuations in Au-Au collisions at
  sqrt-sNN = 200 GeV in Hijing-1.37

abstract:
  Based on Hijing-1.37 simulations, event-wise mean-pt fluctuations in Au-Au
collisions at sqrt-sNN = 200 GeV are studied with graphical and numerical
methods. This study shows that jets/minijets could represent a substantial
source of mean-pt fluctuations, and jet quenching could reduce these
fluctuations significantly. Mean-pt fluctuation measurements are a promising
probe of correlation structure produced in the early stages of central
collisions at RHIC energies.


title:
Indirect Detection of CMSSM Neutralino Dark Matter with Neutrino
  Telescopes

abstract:
  We review the prospects of detecting supersymmetric dark matter in the
framework of the Constrained Minimal Supersymmetric Standard Model, and compare
indirect with direct detection capabilities.


title: DVCS on spinless nuclear targets in impulse approximation

abstract:
  Within the impulse approximation, we derive expressions for the amplitude of
deeply virtual Compton scattering on spinless nuclei in terms of the
generalized parton distributions of the nucleon. As an application, nuclear
effects in the beam-charge and single-spin asymmetries are discussed.


title: Out of Equilibrium Dynamics of the Inflaton Re-examined

abstract:
  In a series of papers Boyanovsky et al. have studied the evolution of an
inflaton with a negative mass squared and a quartic self coupling using the
Closed Time Path (CTP) formalism relevant for out-of-equilibrium dynamics. In
this paper we comment on various aspects of these works. We first compare their
approach to alternate approaches to study inflaton dynamics and point out that
the use of the CTP formalism gives the same results as standard field theory in
the Hartree and leading order large N approximations. We then rederive using
the WKB approximation the large momentum mode functions of the inflaton needed
for renormalisation and point out some differences with the previously obtained
results. We also argue that the WKB approximation is valid only for large $k/a$
and not for large $k$ as apparently assumed in the above mentioned works. We
comment on the renormalisation prescription adopted in these works and finally
discuss how it differs from another more commonly used prescription.


title:
Inclusive Charmonium Production via Double $c \bar c$ in $e^+e^-$
  Annihilation

abstract:
  Motivated by the recent observation of double charm quark pair production by
the Belle Collaboration, we calculate the complete ${\cal O}(\alpha_{s}^{2})$
inclusive production cross sections for $\eta_{c}$, $J/\psi$, and
$\chi_{cJ}$(J=0, 1, 2) plus $c\bar{c}$ in $e^+ e^-$ annihilation through a
virtual photon. We consider both color-singlet and color-octet contributions,
and give the analytical expressions for these cross sections. The complete
color-singlet calculations are compared with the approximate fragmentation
calculations as functions of the center-of-mass energy $\sqrt{s}$. We find that
most of the fragmentation results substantially overestimate the cross sections
(e.g. by a factor of $\sim$4 for $\chi_{c1}$ and $\chi_{c2}$) at the Belle and
BaBar energy $\sqrt{s}=10.6$GeV. The fragmentation results become a good
approximation only when $\sqrt{s}$ is higher than about 100GeV. We further
calculate the color-octet contributions to these cross sections with analytical
expressions. We find that while the color-octet contribution to $J/\psi$
inclusive production via double charm is negligible (only about 3%), the
color-octet contributions to $\chi_{c1}$ and $\chi_{c2}$ can be significant.


title:
Excited Baryons in Large N_c QCD Revisited: The Resonance Picture Versus
  Single-Quark Excitations

abstract:
  We analyze excited baryon properties via a 1/N_c expansion from two
perspectives: as resonances in meson-nucleon scattering, and as single-quark
excitations in the context of a simple quark model. For both types of analysis
one can derive novel patterns of degeneracy that emerge as N_c --> \infty, and
that are shown to be compatible with one another. This helps justify the
single-quark excitation picture and may give some insight into its successes.
We also find that in the large N_c limit one of the S_{11} baryons does not
couple to the pi-N channel but couples to the eta-N channel. This is
empirically observed in the N(1535), which couples very weakly to the pi-N
channel and quite strongly to the eta-N channel. The comparatively strong
coupling of the N(1650) to the pi-N channel and weak coupling to eta-N channel
is also predicted. In the context of the simple quark model picture we
reproduce expressions for mixing angles that are accurate up to O(1/N_c)
corrections and are in good agreement with mixing angles extracted
phenomenologically.


title:
Neutrino Observatories Can Characterize Cosmic Sources and Neutrino
  Properties

abstract:
  Neutrino telescopes that measure relative fluxes of ultrahigh-energy
$\nu_{e}, \nu_{\mu}, \nu_{\tau}$ can give information about the location and
characteristics of sources, about neutrino mixing, and can test for neutrino
instability and for departures from CPT invariance in the neutrino sector. We
investigate consequences of neutrino mixing for the neutrino flux arriving at
Earth, and consider how terrestrial measurements can characterize distant
sources. We contrast mixtures that arise from neutrino oscillations with those
signaling neutrino decays. We stress the importance of measuring $\nu_{e},
\nu_{\mu}, \nu_{\tau}$ fluxes in neutrino observatories.


title:
Technicolor corrections on $B_{s,d} \to \gamma\gamma$ decays in QCD
  factorization

abstract:
  Within the framework of the Top-color-assisted Technicolor (TC2) model, we
calculate the new physics contributions to the branching ratios $\calb(B_{s,d}
\to \gamma \gamma)$ and CP violating asymmetries $\rcpm(B_{s,d} \to \gamma
\gamma)$ in the QCD factorization based on the heavy-quark limit $m_b \gg
\Lambda_{QCD}$. Using the considered parameter space, we find that (a) for both
$B_s\to \gamma \gamma$ and $B_d \to \gamma \gamma$ decays, the new physics
contribution can provide a factor of two to six enhancement to their branching
ratios, (b) for the $B_s \to \gamma \gamma$ decay, its direct CP violation is
very small in both the SM and TC2 model, and (c) the CP violating asymmetry
$\rcpm(B_d \to \gamma \gamma)$ is around the ten percent level in both the SM
and TC2 model, but the sign of CP asymmetry in the TC2 model is different from
that in the SM.


title: Bubble collisions in a SU(2) model of QCD

abstract:
  Starting from the QCD action in an instanton-like SU(2) Yang-Mills field
theory, we derive equations of motion in Minkowski space. Possible bubble
collisions are studued in a (1+1)-dimension reduction . We find gluonic
structures like interior walls, which might give rise to CMBR effects.


title: Theoretical Overview of Lorentz and CPT Violation

abstract:
  In this talk, I discuss some recent theoretical progress concerning the
Lorentz- and CPT-violating extension of the standard model. The results
summarized include the development of an explicit connection between
noncommutative field theory and the standard model extension, placement of new
bounds in the photon sector, calculation of one-loop renormalization beta
functions in QED, and an analysis of field redefinitions.


title: Isospin violation in mixing and decays of rho- and omega-mesons

abstract:
  Influence of the isospin-violating (\rho^0, \omega)-mixing is discussed for
any pair of decays of \rho^0, \omega into the same final state. It is
demonstrated, in analogy to the CP-violation in neutral kaon decays, that
isospin violation can manifest itself in various forms: direct violation in
amplitudes and/or violation due to mixing. In addition to the known decays
(\rho^0, \omega)\to\pi^+\pi^- and (\rho^0, \omega)\to\pi^0\gamma, the pair of
decays to e^+e^- and the whole set of radiative decays with participation of
\rho^0, \omega (in initial or final states) are shown to be also useful and
perspective for studies. Existing data on these decays agree with the universal
character of the mixing parameter and indirectly support enhancement of
\rho^0\to\pi^0\gamma in respect to \rho^{\pm}\to\pi^{\pm}\gamma. Future precise
measurements will allow to separate different forms of isospin violation and
elucidate their mechanisms.


title:
Dynamical mass generation for fermions in quenched Quantum
  Electrodynamics at finite temperature

abstract:
  We study the dynamical generation of masses for fundamental fermions in
quenched quantum electrodynamics (qQED) at finite temperature in the bare
vertex approximation, using Schwinger-Dyson equations (SDE). Motivated by
perturbation theory, a further simplification is introduced by taking the wave
function renormalization to be unity. In the zeroth mode approximation, the SDE
for the fermion propagator resembles QED in 2+1 dimensions (QED3) at zero
temperature with an effective dimensionful coupling alpha'=alpha T. For a fixed
temperature, mass is dynamically generated above a certain critical value of
this coupling. As expected, raising the temperature restores chiral symmetry
and fermions become massless again. We also argue that by summing over the
frequency modes and under suitable simplifications, qualitative aspects of the
result do not undergo significant changes.


title: Optimal Jet Finder

abstract:
  We describe a FORTRAN 77 implementation of the optimal jet definition for
identification of jets in hadronic final states of particle collisions. We
discuss details of the implementation, explain interface subroutines and
provide a usage example. The source code is available from
http://www.inr.ac.ru/~ftkachov/projects/jets/


title: Update on pion weak decay constants in nuclear matter

abstract:
  The QCD sum rule calculation of the in-medium pion decay constants using
pseudoscalar-axial vector correlation function, $i \int d^4x e^{ip\cdot x} <
\rho| T[{\bar d}(x) i \gamma_5 u (x) {\bar u}(0) \gamma_\mu \gamma_5 d (0)] |
\rho>$ is revisited. In particular, we argue that the dimension 5 condensate,
$<{\bar q} (i D_0)^2 q >_N + {1\over 8} < {\bar q} g_s \sigma \cdot {\cal G} q
>_N$, which is crucial for splitting the time ($f_t$) and space ($f_s$)
components of the decay constant, is not necessarily restricted to be positive.
Its positive value is found to yield a tachyonic pion mass. Using the in-medium
pion mass as an input, we fix the dimension 5 condensate to be around $-0.025
{\rm GeV}^2 \sim -0.019$ GeV$^2$. The role of the $N$ and $\Delta$ intermediate
states in the correlation function is also investigated. The $N$ intermediate
state is found not to contribute to the sum rules. For the $\Delta$
intermediate state, we either treat it as a part of the continuum or propose a
way to subtract explicitly from the sum rules. With (and without) explicit
$\Delta$ subtraction while allowing the in-medium pion mass to vary within 139
MeV $ \le m_\pi^* \le$ 159 MeV, we obtain $f_s/f_\pi = 0.37 \sim 0.78$ and $f_t
/ f_\pi = 0.63 \sim 0.79$.


title: Lepton Helicity Distributions in Polarized Drell-Yan Process

abstract:
  The lepton helicity distributions in the polarized Drell-Yan process at RHIC
energy are investigated. For the events with relatively low invariant mass of
lepton pair in which the weak interaction is negligible, only the measurement
of lepton helicity can prove the antisymmetric part of the hadronic tensor.
Therefore it might be interesting to consider the helicity distributions of
leptons to obtain more information on the structure of nucleon from the
polarized Drell-Yan process. We estimate the QCD corrections at O(alpha_s)
level to the hadronic tensor including both intermediate gamma and Z bosons. We
present the numerical analyses for different invariant masses and show that the
u (bar{u}) and d (bar{d}) quarks give different and characteristic
contributions to the lepton helicity distributions. We also estimate the lepton
helicity asymmetry for the various proton's spin configurations.


title: Critical Behavior of Non Order-Parameter Fields

abstract:
  We show that all of the relevant features of a phase transition can be
determined using a non order parameter field which is a physical state of the
theory. This fact allows us to understand the deconfining transition of the
pure Yang-Mills theory via the physical excitations rather than using the
Polyakov loop.


title:
Pair Production and Angular Distribution of Helicity Flipped Neutrinos
  in a Left-Right Symmetric Model

abstract:
  We assume that a massive Dirac neutrino is characteized by two
phenomenological parameters, a magnetic moment, and a charge radius, and we
calculate the cross-section of the scattering $e^+e^-\to \nu \bar \nu$ in a
left-right symmetric model. We also analyze the angular distribution of the
neutrino (antineutrino) with respect to the original direction of the electron
(positron) to different state of helicity of the neutrino. We find that the
favored directions for the neutrino (antineutrino) with respect to the electron
(positron) is forward $(\theta =0)$ and backward $(\theta= \pi)$, and is not
very probable in the perpendicular direction $(\theta = \frac{\pi}{2})$. The
calculation is for $\phi = -0.005$ and $M_{Z_2}=500$ $GeV$, parameters of the
Left-Right symmetric model.


title:
Lepton Flavour Eigenstates do not Exist if Neutrinos are Massive:
  `Neutrino Oscillations' Reconsidered

abstract:
  If neutrinos are massive, `lepton flavour eigenstates' are absent from the
amplitudes of all Standard Model processes. Measurements of $\Gamma(\pi \to e
\nu)/\Gamma(\pi \to \mu \nu)$ and of the MNS matrix are shown to exclude the
existence of such states. Incoherent production of neutrinos of different
flavour modifies the usual oscillation phase derived assuming production of a
lepton flavour eigenstate. The new prediction can be tested in long line-base
experiments by comparison of `$\nu_{\mu}$ disappearance' of neutrinos from pion
and kaon decay.


title: Constraints on extra-dimensional theories from virtual-graviton exchange

abstract:
  We study the effective interactions induced by loops of extra-dimensional
gravitons and show the special role of a specific dimension-6 four-fermion
operator, product of two flavour-universal axial currents. By introducing an
ultraviolet cut-off, we compare the present constraints on low-scale quantum
gravity from various processes involving real-graviton emission and
virtual-graviton exchange. The LEP2 limits on dimension-6 four-fermion
interactions give one of the strongest constraint on the theory, in particular
excluding the case of strongly-interacting gravity at the weak scale.


title:
LFV decays and anomalous magnetic (electric) moments in a lepton mass
  matrices ansatz induced by SUSY GUT

abstract:
  By using the anomalous magnetic and electric dipole moments of the $\tau$
lepton in an effective lagrangian approach to the new physics, we investigate
the lepton flavor violation (LFV) decays, $l\to l'\gamma$, and $\mu,\tau$
anomalous magnetic and electric dipole moments in a lepton mass matrices ansatz
which induced by SUSY GUT. We put very stringent constraints LFV decays and
$\tau$ anomalous magnetic and electric dipole moments.


title: High scale mixing unification and large neutrino mixing angles

abstract:
  Starting with the hypothesis that quark and lepton mixings are identical at
or near the GUT scale, we show that the large solar and atmospheric neutrino
mixing angles together with the small reactor angle $U_{e3}$ can be understood
purely as a result of renormalization group evolution. The only requirements
are that the three neutrinos must be quasi degenerate in mass and have same CP
parity. It predicts that the common Majorana mass for the neutrinos must be
larger than 0.1 eV making the idea testable in the currently planned or ongoing
experiments searching for neutrinoless-double-beta decay.


title:
The form factor of the pion in "point-form" of relativistic dynamics
  revisited

abstract:
  The electromagnetic form factor of the pion is calculated in the "point-form"
of relativistic quantum mechanics using simple, phenomenological wave
functions. It is found that the squared charge radius of the pion is predicted
one order of magnitude larger than the experimental value and the asymptotic
behavior expected from QCD cannot be reproduced. The origin of these
discrepancies is analyzed. The present results confirm previous ones obtained
from a theoretical model and call for major improvements in the implementation
of the "point-form" approach.


title: Transverse-momentum dependent parton distributions in large-Nc QCD

abstract:
  The transverse-momentum dependent quark distributions are studied in the
limit of the large number of colors Nc. The leading orders of Nc are determined
for all twist-2 distributions including the T-odd functions. The isospin
structure of the dominant contributions is found.


title: Equation of State of Oscillating Brans-Dicke Scalar and Extra Dimensions

abstract:
  We consider a Brans-Dicke scalar field stabilized by a general power law
potential with power index $n$ at a finite equilibrium value. Redshifting
matter induces oscillations of the scalar field around its equilibrium due to
the scalar field coupling to the trace of the energy momentum tensor. If the
stabilizing potential is sufficiently steep these high frequency oscillations
are consistent with observational and experimental constraints for arbitrary
value of the Brans-Dicke parameter $\omega$. We study analytically and
numerically the equation of state of these high frequency oscillations in terms
of the parameters $\omega$ and $n$ and find the corresponding evolution of the
universe scale factor. We find that the equation of state parameter can be
negative and less than -1 but it is not related to the evolution of the scale
factor in the usual way. Nevertheless, accelerating expansion is found for a
certain parameter range. Our analysis applies also to oscillations of the size
of extra dimensions (the radion field) around an equilibrium value. This
duality between self-coupled Brans-Dicke and radion dynamics is applicable for
$\omega= -1 + 1/D$ where D is the number of extra dimensions.


title:
Enhancement and Suppression of the Neutrino-Nucleon Total Cross Section
  at Ultra-High Energies

abstract:
  We argue that high gluon density effects at small $x$ are important for the
calculation of ultra-high energy neutrino nucleon cross sections due to the
phenomenon of geometric scaling. We calculate the cross section for $\nu N \to
\mu X$, including high gluon density effects, using the all twist formalism of
McLerran and Venugopalan and show that it can be related to the dipole nucleon
cross section measured in DIS experiments. For neutrino energies of
$E_{\nu}\sim 10^{12}$ GeV, the geometric scaling region extends all the way up
to $Q^2 \sim M^2_{W}$. We show that geometric scaling can lead to an {\it
enhancement} of the neutrino nucleon total cross section by 1-2 orders of
magnitude compared to the leading twist cross section and discuss the
implications for neutrino observatories. At extremely high energies, gluon
saturation effects suppress the neutrino nucleon total cross section and lead
to its unitarization.


title: Interaction of a TeV Scale Black Hole with the Quark-Gluon Plasma at LHC

abstract:
  If the fundamental Planck scale is near a TeV, then parton collisions with
high enough center-of-mass energy should produce black holes. The production
rate for such black holes has been extensively studied for the case of a
proton-proton collision at \sqrt s = 14 TeV and for a lead-lead collision at
\sqrt s = 5.5 TeV at LHC. As the parton energy density is much higher at
lead-lead collisions than in pp collisions at LHC, one natural question is
whether the produced black holes will be able to absorb the partons formed in
the lead-lead collisions and eventually `eat' the quark-gluon plasma formed at
LHC. In this paper, we make a quantitative analysis of this possibility and
find that since the energy density of partons formed in lead-lead collisions at
LHC is about 500 GeV/fm^3, the rate of absorption for one of these black holes
is much smaller than the rate of evaporation. Hence, we argue that black holes
formed in such collisions will decay very quickly, and will not absorb very
many nearby partons. More precisely, we show that for the black hole mass to
increase via parton absorption at the LHC the typical energy density of quarks
and gluons should be of the order of 10^{10} GeV/fm^3. As LHC will not be able
to produce such a high energy density partonic system, the black hole will not
be able to absorb a sufficient number of nearby partons before it decays. The
typical life time of the black hole formed at LHC is found to be a small
fraction of a fm/c.


title: Factorization, Power Corrections, and the Pion Form Factor

abstract:
  This letter is an investigation of the pion form factor utilizing recently
developed effective field theory techniques. The primary results reported are:
Both the transition and electromagnetic form factors are corrected at order
$\Lambda/Q$. However, these corrections only arise due to time ordered products
which are sensitive to soft components of the pion. The usual higher twist wave
function corrections contribute only at order $\Lambda^2/Q^2$, when the quark
mass vanishes. In the case of the electromagnetic form factor the $\Lambda/Q$
power correction is enhanced by a power of $1/\alpha_s(Q)$ relative to the
leading order result of Brodsky and Lepage, if the scale $\sqrt{\Lambda Q}$ is
non-perturbative. This enhanced correction could explain the discrepancy with
the data.


title: Two-loop electroweak angular-dependent logarithms at high energies

abstract:
  We present results on the two-loop leading and angular-dependent
next-to-leading logarithmic virtual corrections to arbitrary processes at
energies above the electroweak scale. In the `t Hooft-Feynman gauge the
relevant Feynman diagrams involving soft and collinear gauge bosons \gamma, Z,
W^\pm coupling to external legs are evaluated in the eikonal approximation in
the region where all kinematical invariants are much larger than the
electroweak scale. The logarithmic mass singularities are extracted from
massive multi-scale loop integrals using the Sudakov method and alternatively
the sector-decomposition method in the Feynman-parameter representation. The
derivations are performed within the spontaneously broken phase of the
electroweak theory, and the two-loop results are in agreement with the
exponentiation prescriptions that have been proposed in the literature based on
a symmetric SU(2) x U(1) theory matched with QED at the electroweak scale.


title: Fermion mass and mixing patterns from a rotating mass matrix

abstract:
  It is shown that all existing data on mixing between up and down fermion
states (i.e. CKM matrix and neutrino oscillations) and on the hierarchical
quark and lepton mass ratios between generations are consistent with the two
phenomena being both consequences of a mass matrix rotating in generation space
with changing energy scale. As a result, the rotation of the mass matrix can be
traced over some 14 orders of magnitude in energy from the mass scale of the
$t$-quark at 175 GeV to below that of the atmospheric neutrino at 0.05 eV. This
is a summary of recent work done in collaboration with Chan Hong-Mo and Jose
Bordes.


title: From Long to Short Distances in Perturbative QCD

abstract:
  Infrared safe differential cross sections, such as event shape distributions,
can be measured over wide kinematic ranges, from regions where fixed order
calculations are adequate to regions where nonperturbative dynamics dominate.
Such observables provide an ideal laboratory for the study of the transition
between weak and strong coupling in quantum field theory. This talk begins with
some of the fundamentals of the perturbative description of QCD and the basis
of resummation techniques, followed by a brief discussion of selected topics
from recent fixed-order and resummed calculations. It focuses on how resummed
perturbation theory has been used to deduce the structure of nonperturbative
corrections, and to provide a framework with which to address the transition
from short- to long-distance dynamics in QCD.


title: Popping out the Higgs boson off vacuum at Tevatron and LHC

abstract:
  In the prospect of diffractive Higgs production at the LHC collider, we give
an extensive study of Higgs boson, dijet, diphoton and dilepton production at
hadronic colliders via diffraction at both hadron vertices. Our model, based on
non factorizable Pomeron exchange, describes well the observed dijet rate
observed at Tevatron Run I. Taking the absolute normalization from data, our
predictions are given for diffractive processes at Tevatron and LHC. Stringent
tests of our model and of its parameters using data being taken now at Tevatron
Run II are suggested. These measurements will also allow to discriminate
between various models and finally to give precise predictions on diffractive
Higgs boson production cross-section at the LHC.


title: D-Meson Production from Recombination in Hadronic Collisions

abstract:
  Nonperturbative effects in $D$-meson production in pion-nucleon and
proton-nucleon collisions are investigated within the recombination model. The
coalescence of perturbatively created charm quarks with sea- and valence-quarks
from projectile and target fragments is shown to be competitive in magnitude
with standard fragmentation calculations at both central (small $x_F$) and
forward rapidities. Corresponding flavor asymmetries for inclusive $D$-meson
production are thus mostly generated on the (light-) parton distribution level,
and turn out to be in reasonable overall agreement with available fixed-target
data. Predictions for upcoming measurements at RHIC are given.


title: J/psi c\bar{c} production in e+e- and hadronic interactions

abstract:
  Predictions of the nonperturbative Quark Gluon Strings model based on the
1/N-expansion in QCD and string picture of interactions for production of
states containing heavy quarks are considered. Relations between fragmentation
functions for different states are used to predict the fragmentation function
of c-quark to J/psi-mesons. The resulting cross section for J/psi-production in
e+e- annihilation is in a good agreement with recent Belle result. It is argued
that associated production of c\bar{c} states with open charm should give a
substantial contribution to production of these states in hadronic interactions
at very high energies.


title:
Reviewing the problem of the U(1) axial symmetry and the chiral
  transition in QCD

abstract:
  We discuss the role of the U(1) axial symmetry for the phase structure of QCD
at finite temperature. We expect that, above a certain critical temperature,
also the U(1) axial symmetry will be (effectively) restored. We will try to see
if this transition has (or has not) anything to do with the usual chiral
transition: various possible scenarios are discussed. In particular, supported
by recent lattice results, we analyse a scenario in which a U(1)-breaking
condensate survives across the chiral transition. This scenario can be
consistently reproduced using an effective Lagrangian model. The effects of the
U(1) chiral condensate on the slope of the topological susceptibility in the
full theory with quarks are studied: we find that this quantity (in the chiral
limit of zero quark masses) acts as an order parameter for the U(1) axial
symmetry above the chiral transition. Further information on the new U(1)
chiral order parameter is derived from the study (at zero temperature) of the
radiative decays of the pseudoscalar mesons in two photons: a comparison of our
results with the experimental data is performed.


title:
Constraining top squark in R-parity violating SUSY model using existing
  Tevatron data

abstract:
  Signal of lighter top squark has been looked for using Tevatron data in the
di-electron plus di-jet channel. We find that the mass of the lighter top
squark when it decays dominantly in the electron plus jet channel, can be ruled
out up to 220 GeV at 95% C.L. using di-electron data. In the framework of
R-parity breaking SUSY model we exclude relevant R-parity violating couplings
for a range of top squark masses and other SUSY parameters. The bounds on
R-parity violating couplings are very stringent for the parameter space where
lighter top squark turns out to be the next to lightest supersymmetric
particle.


title: Preheating and Thermalization after Inflation

abstract:
  After a short review of inlationary preheating, we discuss the development of
equilibrium in the frameworks of massless $\lambda \Phi^4$ model. It is shown
that the process is characterised by the appearance of Kolmogorov spectra and
the evolution towards thermal equilibrium follows self-similar dynamics.
Simplified kinetic theory gives values for all characteristic exponents which
are close to what is observed in lattice simulations. This allows estimation of
the resulting reheating temperature.


title: Neutrinos with Seesaw Masses and Suppressed Interactions

abstract:
  Mixing between light and heavy neutrino states has been proposed as an
explanation (or partial explanation) for the 3-sigma NuTeV anomaly and the
2-sigma departure of the $Z^0$ invisible width from its expected value. I
assume herein that neutrino masses and mixings result from the conventional
seesaw mechanism involving six chiral neutrino states, the first three being
members of weak doublets, the others weak singlets. A finely-tuned choice of
both the (bare) Majorana masses and the (Higgs-induced) Dirac masses can fit
solar and atmospheric neutrino data and also result in significant (but
necessarily flavor-dependent) mixing between singlet and doublet states such as
would yield detectable suppression of light neutrino interaction amplitudes.
The possibility for this kind of suppressive mixing is constrained by the
observed upper limit on radiative muon decay.


title:
Are the New Physics Contributions from the Left-Right Symmetric Model
  Important for the Indirect CP Violation in the Neutral B Mesons?

abstract:
  Several works analyzing the new physics contributions from the Left-Right
Symmetric Model to the CP violation phenomena in the neutral B mesons can be
found in the literature. These works exhibit interesting and experimentally
sensible deviations from the Standard Model predictions but at the expense of
considering a low right scale \upsilon_R around 1 TeV. However, when we stick
to the more conservative estimates for \upsilon_R which say that it must be at
least 10^7 GeV, no experimentally sensible deviations from the Standard Model
appear for indirect CP violation. This estimate for \upsilon_R arises when the
generation of neutrino masses is considered. In spite of the fact that this
scenario is much less interesting and says nothing new about both the CP
violation phenomenon and the structure of the Left-Right Symmetric Model, this
possibility must be taken into account for the sake of completeness and when
considering the see-saw mechanism that provides masses to the neutrino sector.


title:
A Search for Periodicity in the Super-Kamiokande Solar Neutrino Flux
  Data

abstract:
  The publicly available Super-Kamiokande 10 day plot data have been searched
for a periodic modulation in the range between 10 and 500 days, with the
periodogram method. A peak is observed for T = 13.75 days, significant at 98.9%
C.L. I discuss possible ways to check this result and, if confirmed, to
investigate its origin.


title: A QCD Analysis of Quark Recombination for Leading Particle Effect

abstract:
  The quark recombination mechanism is proposed to explain the asymmetry
between production rates of $D^+$ and of $D^-$ in their inclusive productions,
and also asymmetries for other charmed hadrons. These asymmetries are observed
in experiment and are called as leading particle effects. In this work we give
a general analysis for contributions of quark recombination to these
asymmetries. The contributions consist of a perturbative- and nonperturbative
part. We perform two types of factorization by considering the produced hadron
with large transverse momentum and by taking charm quark as a heavy quark,
respectively. In the case of large transverse momentum the effect of quark
recombination is the standard twist-4 effect. We find that the contributions
are parameterized with four nonperturbative functions, defined with four quark
operators at twist-4, for initial hadrons without polarization. By taking charm
quark as a heavy quark the factorization can be performed with the heavy quark
effective theory(HQET). The effect of quark recombination is in general
parameterized by eight nonperturbative parameters which are defined as
integrals with matrix elements of four quark operators defined in HQET. For
unpolarized hadrons in the initial state, the parameters can effectively be
reduced to four. Perturbative parts in the two types of factorization are
calculated at tree-level.


title:
Right-handed Majorana Neutrino Mass Matrices for Generating Bimaximal
  Mixings in Degenerate and Inverted Models of Neutrinos

abstract:
  An attempt is made to generate the bimaximal mixings of the three species of
neutrinos from the textures of the right-handed Majorana neutrino mass
matrices. We extend our earlier work in this paper for the generation of the
nearly degenerate as well as the inverted hierarchical models of the
left-handed Majorana neutrino mass matrices using the non-diagonal textures of
the right-handed Majorana neutrino mass matrices and the diagonal form of the
Dirac neutrino mass matrices, within the frame work of the seesaw mechanism in
a model independent way. Such Majorana neutrino mass models are important to
explain the recently reported result on the neutrinoless double beat decay
(0/nu/beta/beta) experiment,together with the earlier established data on LMA
MSW solar and atmospheric neutrino oscillations.


title:
New, Efficient and Clean Strategies to Explore CP Violation Through
  Neutral B Decays

abstract:
  We point out that decays of the kind $B_d\to D_\pm K_{S(L)}$ and $B_s\to
D_\pm\eta^{(')},D_\pm\phi, ...$, where $D_+$ and $D_-$ denote the CP-even and
CP-odd eigenstates of the neutral D-meson system, respectively, provide very
efficient, theoretically clean determinations of the angle $\gamma$ of the
unitarity triangle. In this new strategy, we use the $B^0_q$--$\bar{B^0_q}$
($q\in\{d,s\}$) mixing phase $\phi_q$ as an input, and employ only ``untagged''
and mixing-induced CP-violating observables, which satisfy a very simple
relation, allowing us to determine $\tan\gamma$. Using a plausible dynamical
assumption, $\gamma$ can be fixed in an essentially unambiguous manner. The
corresponding formalism can also be applied to $B_d\to D_\pm\pi^0,D_\pm\rho^0,
>...$ and $B_s\to D_\pm K_{S(L)}$ decays. Although these modes appear less
attractive for the extraction of $\gamma$, they provide interesting
determinations of $\sin\phi_q$. In comparison with the conventional $B_d\to
J/\psi K_{S(L)}$ and $B_s\to J/\psi\phi$ methods, these extractions do not
suffer from any penguin uncertainties, and are theoretically cleaner by one
order of magnitude.


title:
A Closer Look at $B_{d,s}\to D f_r$ Decays and Novel Avenues to
  Determine $\gamma$

abstract:
  Decays of neutral B mesons originating from $b\to D r$ $(r\in\{s,d\})$
processes, i.e. $B_d\to DK_{S(L)}$, $B_s\to D\eta^{(')}, D\phi, ...$ $(r=s)$
and $B_s\to DK_{S(L)}$, $B_d\to D\pi^0, D\rho^0, ...$ $(r=d)$ modes, offer
valuable insights into CP violation. Here the neutral $D$ mesons may be
observed through $D\to f_\pm$ or $D\to f_{NE}$, where $f_\pm$ and $f_{NE}$ are
CP eigenstates and CP non-eigenstates, respectively. Recently, we pointed out
that ``untagged'' and mixing-induced CP-violating $B_{d,s}\to D_\pm f_s$
observables provide a very efficient, theoretically clean determination of the
angle $\gamma$ of the unitarity triangle. Here we perform a more detailed
analysis of the $B_{d,s}\to D[\to f_\pm]f_s$ channels, and focus on $B_{d,s}\to
D[\to f_{NE}] f_s$, where interference effects between Cabibbo-favoured and
doubly Cabibbo-suppressed D-meson decays lead to complications. We show that
$\gamma$ can nevertheless be determined in an elegant and essentially
unambiguous manner from the $B_{d,s}\to D[\to f_{NE}]f_s$ observables with the
help of the corresponding ``untagged'' $B_{d,s}\to D[\to f_\pm]f_s$
measurements. Moreover, we may also extract hadronic B- and D-decay parameters.
Several interesting features of decays of the kind $B_{d,s}\to D f_d$ are also
pointed out.


title: Neutrino Factories and the "Magic" Baseline

abstract:
  We show that for a neutrino factory baseline of $L \sim 7300 km - 7 600 km$ a
``clean'' measurement of $\sin^2 2 \theta_{13}$ becomes possible, which is
almost unaffected by parameter degeneracies. We call this baseline "magic"
baseline, because its length only depends on the matter density profile. For a
complete analysis, we demonstrate that the combination of the magic baseline
with a baseline of 3000 km is the ideal solution to perform equally well for
the $\sin^2 2 \theta_{13}$, sign of $\Delta m_{31}^2$, and CP violation
sensitivities. Especially, this combination can very successfully resolve
parameter degeneracies even below $\sin^2 2 \theta_{13} < 10^{-4}$.


title: Estimating the inelasticity with the information theory approach

abstract:
  Using the information theory approach, in both its extensive and nonextensive
versions, we estimate the inelasticity parameter $K$ of hadronic reactions
together with its distribution and energy dependence from $p\bar{p}$ and $pp$
data. We find that the inelasticity remains essentially constant in energy
except for a variation around $K\sim 0.5$, as was originally expected.


title: New Exact Solutions for QCD

abstract:
  A new class of exact quantum solutions of QCD is presented. These solutions
have negative energy and are stable to all fluctuations. The lowest-energy
solution state is explicitly constructed and proposed as a candidate for the
QCD vacuum. This vacuum exhibits confinement in the sense that any colored
quark configurations require infinite energy to create. In addition to the
vacuum, other solutions include hadrons whose mass and radius are
self-consistently determined as local minima of the energy.


title: Pion Structure Function $F_{2}^{\pi}$ in the Valon Model

abstract:
  Partonic structure of constituent quark (or{\it{valon}}) in the
Next-to-Leading Order is used to calculate pion structure function. This is a
further demonstration of the finding that the constituent quark structure is
universal, and once it is calculated, the Structure of any hadron can be
predicted thereafter, using a convolution method, without introducing any new
free parameter. The results are compared with the pion structure function from
ZEUS Coll. Leading Neutron Production in $e^{+}p$ collisions at HERA. We found
good agreement with the experiment. A resolution for the issue of normalization
of the experimental data is suggested. In addition, the proportionality of
$F_{2}^{\pi}$ and $F_{2}^{p}$, which have caused confusion in the normalization
of ZEUS data is discussed and resolved.


title:
Crossover quintessence and cosmological history of fundamental
  "constants"

abstract:
  Crossover quintessence predicts that the time variation of fundamental
couplings is substantially faster at redshift $z\approx 2$ than over the past
few billion years. This could reconcile the reported time variation of the fine
structure constant from quasar absorption lines with severe bounds from
archeo-nuclear physics and high precision tests of the equivalence principle.
We present a model that is consistent with all present data on time varying
couplings, tests of the equivalence principle and cosmology.


title:
Nonleptonic B decays into two light mesons in soft-collinear effective
  theory

abstract:
  We consider nonleptonic B decays into two light mesons at leading order in
soft-collinear effective theory, and show that the decay amplitudes are
factorized to all orders in alpha_s. The operators for nonleptonic B decays in
the full theory are first matched to the operators in SCET_I, which is the
effective theory appropriate for sqrt{m_b Lambda} <mu <m_b with Lambda~0.5 GeV.
We evolve the operators and the relevant time-ordered products in SCET_I to
SCET_II, which is appropriate for mu < sqrt{m_b Lambda}. Using the
gauge-invariant operators in SCET_II, we compute nonleptonic B decays in SCET,
including the nonfactorizable spectator contributions and spectator
contributions to the heavy-to-light form factor. As an application, we present
the decay amplitudes for B ->pi,pi in soft-collinear effective theory.


title:
The QCD Pomeron in Ultraperipheral Heavy Ion Collisions: II. Heavy Quark
  Production

abstract:
  The heavy quark production in ultraperipheral heavy ion collisions is
investigated, in particular we focus on the results from the coherent
interactions given by the two-photon process. One addresses the heavy quark
total cross sections at photon level considering the saturation model and the
BFKL dynamics in the color dipole picture. The corresponding cross sections at
nuclear level are presented. It is verified that the QCD dynamics implies an
enhancement of the cross section in comparison with previous calculations.


title: Low-scale Quintessential Inflation

abstract:
  In quintessential inflationary model, the same master field that drives
inflation becomes, later on, the dynamical source of the (present) accelerated
expansion. Quintessential inflationary models require a curvature scale at the
end of inflation around $10^{-6}M_{\rm P}$ in order to explain the large scale
fluctuations observed in the microwave sky. If the curvature scale at the end
of inflation is much smaller than $10^{-6}M_{\rm P}$, the large scale adiabatic
mode may be produced thanks to the relaxation of a scalar degree of freedom,
which will be generically denoted, according to the recent terminology, as the
curvaton field. The production of the adiabatic mode is analysed in detail in
the case of the minimal quintessential inflationary model originally proposed
by Peebles and Vilenkin.


title:
The more precise determination of hadronic contribution to muonic (g-2)
  factor and to alpha(M^2_z)

abstract:
  The hadronic vacuum-polarization contribution to the muon anomalous magnetic
moment a_{mu}(hadr) and to the value of the eleectromagnetic coupling constant
at q^2 = M^2_z are determined more precisely in connection with a new more
exact value of the electronic width of rho-meson. The QCD model with infinite
number of vector mesons is used. The more precisely determined results are:
a_{mu}(hadr) = 678(7)*10^{-10}, \delta\alpha_{hadr}(M^2_z) = 0.02786(6).


title: HadAtom02

abstract:
  These are the proceedings of the workshop "HadAtom02", held at the CERN,
October 14 - 15, 2002. The main topic of the workshop concerned the physics of
hadronic atoms and in this contest recent results from experiments and theory
were presented. These proceedings contain the list of participants, the
scientific program and a short contribution from each speaker.


title: Coupling $g_{f_0 K^+ K^-}$ and the structure of $f_0(980)$

abstract:
  We use light-cone QCD sum rules to evaluate the strong coupling $g_{f_0 K^+
K^-}$ which enters in several analyses concerning the scalar $f_0(980)$ meson.
The result: $6.2\le g_{f_0 K^+ K^-}\le 7.8$ GeV is larger than in previous
determinations.


title: Z-lineshape versus 4th generation masses

abstract:
  The dependence of the Z-resonance shape on the location of the threshold of
the N\bar{N} production (N is the 4th generation neutrino) is analyzed. The
bounds on the existence of 4th generation are derived from the comparison of
the theoretical expression for the Z-lineshape with the experimental data. The
4th generation is excluded at 95% C. L. for m_N<46.7\pm 0.2 GeV.


title: CP violation in $B \to \phi K_S$ decay at large $\tan\beta$

abstract:
  We consider the chargino contribution to the CP violation in $B \to \phi K_S$
decay in the minimal supersymmetric standard model at large $\tan\be$. It is
shown that the Wilson coefficient $C_{8g}$ of the chromomagnetic penguin
operator can be significantly enhanced by the chargino-mediated diagrams while
satisfying other direct/indirect experimental constraints. The enhanced
$C_{8g}$ allows large deviation in the CP asymmetry from the standard model
prediction, especially it can explain the apparent anomaly reported by BaBar
and Belle.


title: Spontaneous baryogenesis in warm inflation

abstract:
  We discuss spontaneous baryogenesis in the warm inflation scenario. In
contrast with standard inflation models, radiation always exists in the warm
inflation scenario, and the inflaton must be directly coupled to it. Also, the
transition to the post-inflationary radiation dominated phase is smooth and the
entropy is not significantly increased at the end of the period of inflation.
In addition, after the period of warm inflation ends, the inflaton does not
oscillate coherently but slowly rolls. We show that as a consequence of these
features of warm inflation, the scenario can well accommodate the spontaneous
baryogenesis mechanism, provided that the decoupling temperature $T_{D}$ of the
baryon or the $B-L$ violating interactions is higher than the temperature of
radiation during the late stages of inflation.


title: Neutrino Masses in a 5D $SU(3)_W$ TeV Unification Model

abstract:
  We study the generation of neutrino masses in the $SU(3)_W$ electroweak
unified theory in $M_4\times S_1/(Z_2\times Z'_2)$ spacetime. By appropriate
orbifolding, the bulk symmetry $SU(3)_W$ is broken into $SU(2)_L \times U(1)_Y$
at one of the fixed points, where the quarks reside. The leptons form $SU(3)_W$
triplets, localized at the other symmetric fixed point. The fermion masses
arise from the bulk Higgs sector containing a triplet and an anti-sextet. We
construct neutrino Majorana masses via 1-loop quantum corrections by adding a
parity odd bulk triplet scalar. No right-handed neutrino is needed. The
neutrino mass matrix is of the inverted hierarchy type. We show that the model
can easily accommodate the bi-large mixing angle solution favored by the recent
neutrino experiments without much fine tuning of parameters. The constraints
from $\mu\ra 3e$ transition and neutrinoless double beta decays are discussed.


title:
Higgs pair production in association with a vector boson at e+e-
  colliders in theories of higher dimensional gravity

abstract:
  The models of large extra compact dimensions, as suggested by Arkani-Hamed,
Dimopoulos and Dvali, predict exciting phenomenological consequences with
gravitational interactions becoming strong at the TeV scale. Such theories can
be tested at the existing and future colliders. In this paper, we study the
contribution of virtual Kaluza-Klein excitations (both spin-0 and 2) in the
process $e^+e^- \to HHZ$ and $ e^+e^- \to HH\gamma $ at future linear collider
(NLC). We find that the virtual exchange KK gravitons can modify the
cross-section $\sigma(e^+e^- \to HHZ)$ significantly from its Standard Model
value and will allow the effective string scale to be probed up to 6.6 TeV. The
second process is absent at the tree level in the standard model, and can
therefore be used to put limits on the effective string scale of 7.4 TeV.


title: Warped QCD without the Strong CP Problem

abstract:
  QCD in a five-dimensional sliced AdS bulk with chiral extra-quarks on the
boundaries is generically free from the strong CP problem. Accidental axial
symmetry is naturally present except for suppressed breaking interactions,
which plays a role of the Peccei-Quinn symmetry to make the strong CP phase
sufficiently small. Breaking suppression and enhancement due to AdS warping are
considered in addition to naive boundary separation effects.


title:
About neutral kaons and similar systems; from quantum field theory to
  effective mass matrices

abstract:
  Systems of neutral interacting mesons are investigated, concerning in
particular the validity of their description by an effective hamiltonian.
First, I study its connection to quantum field theory and show that the
spectrum of such systems cannot be reduced in general to the one of a single
constant effective mass matrix. Choosing nevertheless to work in this customary
formalism, one then faces several ways to diagonalize a complex matrix, which
lead to different eigenvalues and eigenvectors. Last, and it is the main
subject of this work, because K0 and its charge conjugate K0bar are also
connected, in quantum field theory, by hermitian conjugation, any constant
effective mass matrix is defined, in this basis, up to arbitrary diagonal
antisymmetric terms; I use this freedom to deform the mass matrix in various
ways and study the consequences on its spectrum. Emphasis is put on the role of
discrete symmetries throughout the paper. That the degeneracy of the
eigenvalues of the full renormalized mass matrix can be a sufficient condition
for the outcome of CP violation is outlined in an appendix. In the whole work,
the dual formalism of |in> and <out| states and bi-orthogonal basis, suitable
for non-normal matrices, is used.


title: Superluminal pions in a hadronic fluid

abstract:
  We study the propagation of pions at finite temperature and finite chemical
potential in the framework of the linear sigma model with 2 quark flavors and
$N_c$ colors. The velocity of massless pions in general differs from that of
light. One-loop calculations show that in the chiral symmetry broken phase
pions, under certain conditions, propagate faster than light.


title: Essential Solar Neutrinos

abstract:
  A Neutrino Unbound gem (http://www.to.infn.it/~giunti/NU). Essential
information (formulas, figures, tables, references, etc.) on solar neutrinos.


title:
A new gamma*-p / pbar-p factorization test in diffraction, valid below
  Q^2 about 6 GeV^2

abstract:
  One of the key experimental issues in high energy hadron physics is the
extent to which data from the diffractive interaction mechanism may be
described by a factorized formula which is the product of a universal term
describing the probability of finding a Pomeron in a proton (loosely referred
to as the "Pomeron flux-factor") and a term decribing the Pomeron's interaction
with the other incident proton. In the present paper, after demonstrating that
existing data on diffractive gamma*-p and pbar-p interactions show that the
Pomeron flux-factor is not universal, we present the results of a new test of
factorization in these interactions which does not rely on universality of the
flux-factor. The test is satisfied to within ~20% for 1 < Q^2 ~ 6 GeV^2 and
beta < 0.2 in the gamma*-p interactions, suggesting that the resons for
non-universality of the flux-factor have a limited effect on the factorization
itself. However, a clear breakdown of this test is observed at larger Q^2.
Kharzeev and Levin suggest that this can be attributed to the onset of QCD
evolution effects in the Pomeron's structure. The breakdown occurs in a Q^2
region which agrees with their estimates of a small Pomeron size.


title: Supersymmetry and neutrino mass

abstract:
  The existence of neutrino mass and mixing is a strong pointer towards physics
beyond the standard model. An overview of the possibility of having neutrino
masses in supersymmetric theories is attempted here. Some of the recent works
reviewed suggest Dirac masses, whereas others include Majorana masses as well.
Side by side, it is shown how R-parity violating supersymmetry opens new
avenues in the neutrino sector. Reference is also made to light sterile
neutrinos, nearly degenerate neutrinos and neutrinos acquiring masses from hard
supersymmetry breaking terms which are suppressed by the Planck scale. In
several of the cases, it is pointed out how the models that give neutrino
masses and mixing have independent motivations of their own, and can be tested
in accelerator experiments.


title: N* Properties from the 1/N_c Expansion

abstract:
  The 1/N_c expansion (N_c being the number of QCD colors) has been applied in
recent papers to the phenomenology of excited baryon resonances. This talk
surveys the work done to date, and discusses its successes and remaining
challenges.


title: A remark on the short distance potential in gluodynamics

abstract:
  The structure of leading nonperturbative corrections to the static Coulomb
potential in QCD at small distances is analyzed. We argue in favor of the
correction linearly dependent on distance and remark that lattice measurements
of static potential for charges in higher representations can distinguish
between different phenomenological models used to describe it. Related problems
of validity of Dirac quantization condition for running charges in abelian
theory and significance of the quantity <A^2> are briefly discussed.


title: The Standard Model Partly Supersymmetric

abstract:
  We present a novel class of theories where supersymmetry is only preserved in
a partial (non-isolated) sector. The supersymmetric sector consists of CFT
bound-states that can coexist with fundamental states which do not respect
supersymmetry. These theories arise from the 4D holographic interpretation of
5D theories in a slice of AdS where supersymmetry is broken on the UV boundary.
In particular, we consider the Standard Model where only the Higgs sector (and
possibly the top quark) is supersymmetric. The Higgs mass-parameter is then
protected by supersymmetry, and consequently the electroweak scale is naturally
smaller than the composite Higgs scale. This not only provides a solution to
the hierarchy problem, but predicts a ``little'' hierarchy between the
electroweak and new physics scale. Remarkably, the model only contains a single
supersymmetric partner, the Higgsino (and possibly the stop), and as in the
usual MSSM, predicts a light Higgs boson.


title: Proton number fluctuation as a signal of the QCD critical end-point

abstract:
  We argue that the event-by-event fluctuation of the proton number is a
meaningful and promising observable for the purpose of detecting the QCD
critical end-point in heavy-ion collision experiments. The long range
fluctuation of the order parameter induces a characteristic correlation between
protons which can be measured. The proton fluctuation also manifests itself as
anomalous enhancement of charge fluctuations near the end-point, which might be
already seen in existing data.


title: Renormalization group analysis of the tau-lepton decay within QCD

abstract:
  A technique to sum up the regular corrections appearing under the analytic
continuation from the spacelike momentum region to the timelike one is
proposed. A perturbative part of the inclusive semileptonic decay width of the
tau-lepton in analyzed in detail.


title:
CP violation in top quark production at the LHC and Two-Higgs-Doublet
  Models

abstract:
  We discuss CP violation in top-antitop production at the LHC, induced by
gluon fusion and final-state Higgs exchange. Results by Bernreuther and
Brandenburg are confirmed and further reduced. The lepton energy asymmetry is
studied in detail in explicit Two-Higgs-Doublet Models with near-maximal mixing
in the neutral Higgs sector. Unless there is only one light Higgs particle, and
unless (in Model II) tanbeta \lsim 1, the CP-violating effects are very small,
possibly too small to be seen at the LHC.


title: Massive and Massless Scalar Field and Confinement

abstract:
  Generalization of QCD motivated classical SU(2) Yang--Mills theory coupled to
the scalar field is discussed. The massive scalar field, corresponding the
scalar glueball, provides a confining potential for static, point-like,
external sources. In case of massless scalar field screening solutions are
found. However, there is a confining sector as well. Both, massive and massless
confining solutions are compared with phenomenological potentials. The case of
non-dynamical permittivity is also discussed.


title: What do we know about the proton spin structure?

abstract:
  A brief summary of the theoretical and experimental knowledge of the spin
structure of the proton is presented. The helicity distributions of quark and
gluons are discussed, together with their related sum rules. The transversity
distribution is also introduced with possible strategies for its measurement.
Novel spin dependent and $\bfk_\perp$ unintegrated distribution and
fragmentation functions are discussed, in connection with a new and rich
phenomenology of transverse single spin asymmetries.


title: Deeply virtual Compton scattering off nuclei

abstract:
  We consider the hard leptoproduction of a photon off nuclei up to spin-1. As
a new result we present here the general azimuthal angular dependence of the
differential cross section for a spin-1 target. Its twist-two Fourier
coefficients of the interference and squared deeply virtual Compton scattering
amplitude are evaluated in leading order approximation of perturbation theory
in terms of generalized parton distributions, while the pure Bethe--Heitler
cross section is exactly calculated in terms of electromagnetic form factors.
Relying on a simple model for the nucleon generalized parton distribution $H$,
which describes the existing DVCS data for a proton target, we estimate the
size of unpolarized cross sections, beam and longitudinal target spin as well
as unpolarized charge asymmetries for present fixed target experiments with
nuclei. These estimates are confronted with preliminary HERMES data for
deuterium and neon.


title: Transversity and Lambda polarization

abstract:
  Two related issues are discussed, which might be easily explored by present
and future COMPASS experiments. The first one deals with the new world of
transversity, the fundamental polarized parton distribution so far totally
unknown. The second issue concerns Lambda production in polarized
semi-inclusive processes, with a measurement of the Lambda polarization, which
might give novel information on distribution and fragmentation properties of
polarized partons. In case of transverse polarization the detection of Lambda's
gives access to a new way of measuring transversities. Also the interesting
case of Lambda polarization in unpolarized processes is discussed.


title:
The universal psi-prime-prime to psi-prime ratio as unambiguous
  signature for hard physics in nuclear reactions and in decays of beauty
  hadrons

abstract:
  We suggest the ratio of the $\psi''(3770)/\psi'(3686)$ production cross
sections as an unambiguous probe of the dominance of hard, point-like physics
in charmonium production. If hard physics dominates the charmonium production
the ratio : ${\sigma(\psi'')\over\sigma(\psi')}\approx {\Gamma(\psi''\to
l^+l^-)\over \Gamma(\psi'\to l^+l^-)} \approx 0.1$ is independent of the
process. We argue that since the dominant $D\bar D$ decay mode of the
$\psi''$-meson can be detected with a high efficiency at the current facilities
the effective counting rate for the $\psi''$ production should be comparable to
that of the $\psi'$ and hence it could be observed at the $B$-factories. Even
in hadron induced processes the ratio will not be changed significantly by
final state interactions due to the similar mass and size of these two
charmonium states. A possible exception are the charmonium state interactions
with low energy particles -- comovers -- which are especially relevant for the
heavy ion collisions.


title: J/\psi Photo- and DIS Production via Nonlinear Evolution

abstract:
  We apply our solution of the nonlinear evolution equation to the case of
  $J/\psi$ photo and DIS production on nucleons and nuclei targets. The
uncertainty in the $J/\psi$ wave function normalization due to Fermi motion is
treated as a free parameter. We obtain good reproduction of the HERA
experimental data on a proton target. Calculations of $J/\psi$ mesons coherent
production on nuclei targets are presented and discussed. Our analysis supports
the conclusions reached in our previous studies, stressing the importance of
nonlinear evolution in the kinematical domain of high-density QCD.


title: Gribov's Light Quark Confinement Scenario

abstract:
  I give a brief description of Gribov's light quark confinement scenario and
of the Gribov--Dyson--Schwinger equation for light quarks. It is shown that the
Green function obtained from this equation exhibits chiral symmetry breaking.


title: Turkish Comments on "Future Perspectives in HEP"

abstract:
  These comments were prepared during the ICFA Seminar on "Future Persrectives
in High Energy Physics" held at CERN (8-11 October 2002) and partially
presented at the Panel and General Discussion on Interregional Collaboration
for Future Facilities (10 October). Comments include arguments favoring the
existence of the fourth SM family and new level of compositness. Then, the
possible role of the linac-ring type colliders for future HEP research is
discussed emphasizing TeV scale lepton-hadron and photon-hadron colliders. This
preprint presents prepared transparencies and some illuminating remarks with
corresponding references.


title: Symmetry breaking and quark-hadron duality in structure functions

abstract:
  We identify conditions under which a summation over nucleon resonances can
yield, via quark-hadron duality, parton model results for electromagnetic and
neutrino structure functions at large x. While a summation over the lowest even
and odd parity multiplets is sufficient to achieve duality in the symmetric
quark model, a suppression of transitions to specific final states is required
for more realistic cases incorporating SU(6) breaking. We outline several
scenarios consistent with duality, discuss their implications for the high Q^2
behavior of transition form factors, and illustrate how they can expose the
patterns in the flavor-spin dependence of inter-quark forces.


title: Little Inflatons and Gauge Inflation

abstract:
  Cosmological inflation gives a natural answer for a variety of cosmological
questions, including the horizon problem, the flatness problem, and others.
However, inflation yields new questions relating to the flatness of the
inflaton potential. Recent studies of ``little'' fields, a special class of
pseudo-Goldstone bosons, have shown it is possible to protect the mass of a
field while still yielding order one interactions with other fields. In this
paper, we will show that ``little inflatons'' are natural candidates for the
slow roll field of hybrid inflation models. We consider both supersymmetric and
non-supersymmetric models, and give a simple examples based on approximate
Abelian symmetries which solve the inflaton flatness problem of supergravity.
We also present hybrid models in which components of gauge fields in higher
dimensions play the role of the inflaton. Protected by higher-dimensional gauge
symmetry, they, too, naturally have large couplings while suppressed mass
terms. We summarize the implications of the new WMAP data on such models.


title: Neutrinos and Nucleosynthesis in Supernova

abstract:
  The type II supernova is considered as a candidate site for the production of
heavy elements. The nucleosynthesis occurs in an intense neutrino flux, we
calculate the electron fraction in this environment.