title: On the observability of the neutrino charge radius

abstract:
  It is shown that the probe-independent charge radius of the neutrino is a
physical observable; as such, it may be extracted from experiment, at least in
principle. This is accomplished by expressing a set of experimental
neutrino-electron cross-sections in terms of the finite charge radius and two
additional gauge- and renormalization-group-invariant quantities, corresponding
to the electroweak effective charge and mixing angle.


title: Vacuum Hydrodynamics

abstract:
  The Higgs vacuum -- with its constant background field -- is not `empty' but
is a kind of medium. Any ordinary medium, viewed at sufficiently long length
scales, has a hydrodynamic description and can propagate sound waves. The
vacuum medium is unusual; the speed of sound is formally infinite and there is
no linear sound-wave regime. Instead, long-wavelength disturbances are
described by some intrinsically nonlinear hydrodynamic equations.


title:
A simple model for nuclear structure functions at small $x$ in the
  dipole picture

abstract:
  A simple model for nuclear structure functions in the region of small x and
small and moderate $Q^2$, is presented. It is a parameter-free extension, in
the Glauber-Gribov approach to nuclear collisions, of a saturation model for
the nucleon. A reasonable agreement with experimental data on ratios of nuclear
structure functions is obtained. Nuclear effects in the
longitudinal-to-transverse cross section ratios are found to be small.
Predictions of the model for values of $x$ smaller than those available to
present experiments are given. The unintegrated gluon distribution and the
behaviour of the saturation scale which result from this model are shown and
discussed.


title: B-Meson Gateways to Missing Charmonium Levels

abstract:
  We outline a coherent strategy for exploring the four remaining narrow
charmonium states [$\eta_{c}^{\prime}(2\slj{1}{1}{0})$,
$h_{c}(1\slj{1}{2}{1})$, $\eta_{c2}(1\slj{1}{3}{2})$, and
$\psi_{2}(1\slj{3}{3}{2})$] expected to lie below charm threshold. Produced in
$B$-meson decays, these levels should be identifiable \textit{now} via striking
radiative transitions among charmonium levels and in exclusive final states of
kaons and pions. Their production and decay rates will provide much needed new
tests for theoretical descriptions of heavy quarkonia.


title: Note on Triangle Anomalies and Assignment of Singlet in 331-like Model

abstract:
  It is pointed out that in the $331-$like model which uses both fundamental
and complex conjugate representations for an assignment of the representations
to the left-handed quarks and the scalar representation to their corresponding
right-handed counterparts, the nature of the scalar should be taken into
account in order to make the fermion triangle anomalies in the theory
anomaly-free, i.e. renormalizable in a sense with no anomalies, even after the
spontaneous symmetry breaking.


title: The Minimal Moose for a Little Higgs

abstract:
  Recently a new class of theories of electroweak symmetry breaking have been
constructed. These models, based on deconstruction and the physics of theory
space, provide the first alternative to weak-scale supersymmetry with naturally
light Higgs fields and perturbative new physics at the TeV scale. The Higgs is
light because it is a pseudo-Goldstone boson, and the quadratically divergent
contributions to the Higgs mass are cancelled by new TeV scale ``partners'' of
the {\em same} statistics. In this paper we present the minimal theory space
model of electroweak symmetry breaking, with two sites and four link fields,
and the minimal set of fermions. There are very few parameters and degrees of
freedom beyond the Standard Model. Below a TeV, we have the Standard Model with
two light Higgs doublets, and an additional complex scalar weak triplet and
singlet. At the TeV scale, the new particles that cancel the 1-loop quadratic
divergences in the Higgs mass are revealed. The entire Higgs potential needed
for electroweak symmetry breaking--the quartic couplings as well as the
familiar negative mass squared--can be generated by the top Yukawa coupling,
providing a novel link between the physics of flavor and electroweak symmetry
breaking.


title: The Littlest Higgs

abstract:
  We present an economical theory of natural electroweak symmetry breaking,
generalizing an approach based on deconstruction. This theory is the smallest
extension of the Standard Model to date that stabilizes the electroweak scale
with a naturally light Higgs and weakly coupled new physics at TeV energies.
The Higgs is one of a set of pseudo Goldstone bosons in an $SU(5)/SO(5)$
nonlinear sigma model. The symmetry breaking scale $f$ is around a TeV, with
the cutoff $\Lambda \lsim 4\pi f \sim $ 10 TeV. A single electroweak doublet,
the ``little Higgs'', is automatically much lighter than the other pseudo
Goldstone bosons. The quartic self-coupling for the little Higgs is generated
by the gauge and Yukawa interactions with a natural size $O(g^2,\lambda_t^2)$,
while the top Yukawa coupling generates a negative mass squared triggering
electroweak symmetry breaking. Beneath the TeV scale the effective theory is
simply the minimal Standard Model. The new particle content at TeV energies
consists of one set of spin one bosons with the same quantum numbers as the
electroweak gauge bosons, an electroweak singlet quark with charge 2/3, and an
electroweak triplet scalar. One loop quadratically divergent corrections to the
Higgs mass are cancelled by interactions with these additional particles.


title: Prompt Quark Production by exploding Sphalerons

abstract:
  Following recent works on production and subsequent explosive decay of QCD
sphaleron-like clusters, we discuss the mechanism of quark pair production in
this process. We first show how the gauge field explosive solution of Luscher
and Schechter can be achieved by non-central conformal mapping from the
O(4)-symmetric solution. Our main result is a new solution to the Dirac
equation in real time in this configuration, obtained by the same inversion of
the fermion O(4) zero mode. It explicitly shows how the quark acceleration
occurs, starting from the spherically O(3) symmetric zero energy chiral quark
state to the final spectrum of non-zero energies.
  The sphaleron-like clusters with any Chern-Simons number always produce ${\rm
N_F} {\bar {\bf L}}{\bf R}$ quarks, and the antisphaleron-like clusters the
chirality opposite.
  The result are relevant for hadron-hadron and nucleus-nucleus collisions at
large $\sqrt{s}$, wherein such clusters can be produced.


title: Mooses, Topology and Higgs

abstract:
  New theories of electroweak symmetry breaking have recently been constructed
that stabilize the weak scale and do not rely upon supersymmetry. In these
theories the Higgs boson is a weakly coupled pseudo-Goldstone boson. In this
note we study the class of theories that can be described by theory spaces and
show that the fundamental group of theory space describes all the relevant
classical physics in the low energy theory. The relationship between the low
energy physics and the topological properties of theory space allow a
systematic method for constructing theory spaces that give any desired low
energy particle content and potential. This provides us with tools for
analyzing and constructing new theories of electroweak symmetry breaking.


title:
Measuring the Higgs Boson Self Coupling at the LHC and Finite Top Mass
  Matrix Elements

abstract:
  Inclusive Standard Model Higgs boson pair production and subsequent decay to
same-sign dileptons via weak gauge W bosons at the CERN Large Hadron Collider
has the capability to determine the Higgs boson self-coupling, lambda. The
large top quark mass limit is found not to be a good approximation for the
signal if one wishes to utilize differential distributions in the analysis. We
find that it should be possible at the LHC with design luminosity to establish
that the Standard Model Higgs boson has a non-zero self-coupling and that
lambda/lambda(SM) can be restricted to a range of 0--3.7 at 95% confidence
level if its mass is between 150 and 200 GeV.


title:
CP--violating Chargino Contributions to the Higgs Coupling to Photon
  Pairs in the Decoupling Regime of Higgs Sector

abstract:
  In most supersymmetric theories, charginos $\tilde{\chi}^\pm_{1,2}$ belong to
the class of the lightest supersymmetric particles and the couplings of Higgs
bosons to charginos are in general complex so that the CP--violating chargino
contributions to the loop--induced coupling of the lightest Higgs boson to
photon pairs can be sizable even in the decoupling limit of large pseudoscalar
mass $m_A$ with only the lightest Higgs boson kinematically accessible at
future high energy colliders. We introduce a specific benchmark scenario of CP
violation consistent with the electric dipole moment constraints and with a
commonly accepted baryogenesis mechanism in the minimal supersymmetric Standard
Model. Based on the benchmark scenario of CP violation, we demonstrate that the
fusion of the lightest Higgs boson in linearly polarized photon--photon
collisions can allow us to confirm the existence of the CP--violating chargino
contributions {\it even in the decoupling regime of the Higgs sector} for
nearly degenerate SU(2) gaugino and higgsino mass parameters of about the
electroweak scale.


title: Cosmic Density Perturbations from Late-Decaying Scalar Condensations

abstract:
  We study the cosmic density perturbations induced from fluctuation of the
amplitude of late-decaying scalar condensations (called \phi) in the scenario
where the scalar field \phi once dominates the universe. In such a scenario,
the cosmic microwave background (CMB) radiation originates to decay products of
the scalar condensation and hence its anisotropy is affected by the fluctuation
of \phi. It is shown that the present cosmic density perturbations can be
dominantly induced from the primordial fluctuation of \phi, not from the
fluctuation of the inflaton field. This scenario may change constraints on the
source of the density perturbations, like inflation. In addition, a correlated
mixture of adiabatic and isocurvature perturbations may arise in such a
scenario; possible signals in the CMB power spectrum are discussed. We also
show that the simplest scenario of generating the cosmic density perturbations
only from the primordial fluctuation of \phi (i.e., so-called ``curvaton''
scenario) is severely constrained by the current measurements of the CMB
angular power spectrum if correlated mixture of the adiabatic and isocurvature
perturbations are generated.


title: Explicit model realizing parton-hadron duality

abstract:
  An explicit model realizing parton-hadron duality and fitting the data is
suggested. Complex nonlinear Regge trajectories are important ingredients of
the model. The inclusion of $\Delta$ and $N^*$ trajectories should account for
all resonances in the direct channel. The exotic trajectory is responsible for
the smooth background.


title: Analyticity Relations at High Energies and Forward Scattering

abstract:
  Making use of a derivative dispersion approach, we investigate the behavior
of the the total cross section and the rho parameter for pp and p(bar)p
scattering from accelerator to cosmic ray energies. The discrepancies in the
cosmic ray information is treated through the definition of two different
ensembles of data. Simultaneous and individual fits to the above quantities
through the Donnachie-Landshof and Kang-Nicolescu parametrizations allows to
infer an upper bound for the intercept of the soft Pomeron and also show that
the data investigated do not favor the Odderon hypothesis.


title: Finite mass corrections in orbifold gauge theories

abstract:
  The Standard Model Higgs boson can be identified with the extra dimensional
component of a gauge boson in a higher dimensional theory where the gauge group
is broken to the Standard Model group by the orbifold action. In that case the
Standard Model symmetry can be radiatively broken by the Hosotani mechanism and
the Higgs boson mass is protected from bulk quadratic divergences by the higher
dimensional gauge theory without any need of supersymmetry. However the latter
does not protect a priori the Higgs mass from brane quadratic divergences. We
show by an explicit calculation in the orbifold $S^1/Z_2$ that such effects are
absent at one-loop. Moreover we identify the symmetry that protects such brane
mass terms to all orders in perturbation theory and thus guarantees the absence
of a corresponding mass counterterm


title:
Collider Signatures of Neutrino Masses and Mixing from R-parity
  Violation

abstract:
  R-parity violation in the supersymmetric standard model can be the source of
neutrino masses and mixing. We analyze the neutrino mass matrix coming from
either bilinear or trilinear R-parity violation and its collider signatures,
assuming that the atmospheric and solar neutrino data are explained by three
active neutrino oscillations. Taking the gauge mediated supersymmetry breaking
mechanism, we show that the lightest neutralino decays well inside the detector
and the model could be tested by observing its branching ratios in the future
colliders. In the bilinear model where only the small solar neutrino mixing
angle can be accommodated, the relation, $10^3$ BR($\nu e^\pm \tau^\mp$) $\sim$
BR($\nu \mu^\pm \tau^\mp$) $\approx$ BR($\nu \tau^\pm \tau^\mp$), serves as a
robust test of the model. The large mixing angle solution can be realized in
the trilinear model which predicts BR($\nu e^\pm \tau^\mp$) $\sim$ BR($\nu
\mu^\pm \tau^\mp$) $\sim$ BR($\nu \tau^\pm \tau^\mp$). In either case, the
relation, BR($e jj$) $\ll$ BR($\mu jj$) $\sim$ BR($\tau jj$), should hold to be
consistent with the atmospheric neutrino and CHOOZ experiments.


title: Lambda Polarization in Deep-Inelastic Production

abstract:
  We propose a model for the longitudinal polarization of Lambda baryons
produced in deep-inelastic lepton scattering at any xF, based on static SU(6)
quark-diquark wave functions and polarized intrinsic strangeness in the nucleon
associated with individual valence quarks. Free parameters of the model are
fixed by fitting the NOMAD data on the longitudinal polarization of Lambda
hyperons in neutrino interactions. Our model correctly reproduces the observed
dependences of Lambda polarization on the kinematic variables. Within the
context of our model, the NOMAD data imply that the intrinsic strangeness
associated with a valence quark has anticorrelated polarization. We also
compare our model predictions with results from the HERMES and E665 experiments
using charged leptons. Predictions of our model for the COMPASS experiment are
also presented.


title:
Measurement of Lambda and Lambda-bar polarization in muon neutrino
  charged current interactions in NOMAD

abstract:
  The Lambda and Lambda-bar polarizations in muon neutrino charged current
interactions have been measured in the NOMAD experiment. The event sample (8087
reconstructed Lambda's and 649 Lambda-bar's) is more than an order of magnitude
larger than that of previous bubble chamber experiments, while the quality of
event reconstruction is comparable. For the Lambda hyperons we observe negative
polarization along the W-boson direction which is enhanced in the target
fragmentation region: Px(xF < 0) = -0.21 +- 0.04 (stat) +- 0.02 (sys). In the
current fragmentation region we find Px(xF > 0) = -0.09 +- 0.06 (stat) +-
0.03(sys). A significant transverse polarization (in the direction orthogonal
to the Lambda production plane) has been observed for the first time in a
neutrino experiment: Py = -0.22 +- 0.03 (stat) +- 0.01 (sys). The dependence of
the absolute value of Py on the Lambda transverse momentum with respect to the
hadronic jet direction is in qualitative agreement with the results from
unpolarized hadron-hadron experiments. The polarization vector of Lambda-bar
hyperons measured for the first time in neutrino interactions is found to be
consistent with zero.


title:
General Quasiparticle Propagator and Mass Dependence in Degenerate Color
  Superconductivity

abstract:
  The general quasiparticle propagator in dense quark matter is derived for
equal mass quarks. Specialized to an NJL model, this propagator includes one
new condensate, $\Delta_3$, in addition to the usual CFL condensate,
$\Delta_1$. The gap equation is solved in two NJL models and the dependence on
the quark mass of the condensates and the gap is presented. Analytic
approximations for the condensates are obtained and compared to exact numerical
solutions. The results are shown to differ from those obtained by neglecting
$\Delta_3$, especially for smaller values of $\Delta_1$. The two different NJL
models presented are also shown to give different results when $\Delta_3$ is
not neglected. The methods used in this paper can be generalized to the
physical case where only the strange quark is significantly massive.


title: The silver channel at the Neutrino Factory

abstract:
  We notice that looking for $\nu_e \to \nu_\tau$ at the same time as $\nu_e
\to \nu_\mu$ oscillations could significantly help to reduce the errors in the
leptonic CP-violating phase $\delta$ measurement. We show how the $\nu_e \to
\nu_\mu$ (``golden'') and $\nu_e \to \nu_\tau$ (``silver'') transitions
observed at an OPERA-like 2 Kton lead-emulsion detector at L = 732 Km, in
combination with the $\nu_e \to \nu_\mu$ transitions observed at a 40 Kton
magnetized iron detector with a baseline of L = 3000 Km, strongly reduce the
so-called $(\theta_{13}, \delta)$ ambiguity. We also show how a moderate
increase in the OPERA-like detector mass (4 Kton instead of 2 Kton) completely
eliminates the clone regions even for small values of $\theta_{13}$.


title: Universal Extra Dimensions at the e-e- Colliders

abstract:
  Universal Extra Dimensions (UEDs) with compactification radius near the TeV
scale provide interesting phenomenology at future colliders. The collider
signals of the first Kaluza-Klein (KK) level are very similar to those of a
supersymmetric model with a nearly degenerate superpartner spectrum. The
heavier first level KK states cascade decay to the lightest KK particles (LKP),
which is neutral and stable because of KK-parity. The signatures involve
missing energy and relatively soft jets and leptons which can be difficult for
detection. The KK electron signal in $e^- e^-$ collisions is free from the
problematic two photon background therefore provides a unique opportunity for a
detailed studies of the KK electrons in the Universal Extra Dimension scenario.


title: Higher order QED corrections to muon decay spectrum

abstract:
  QED radiative corrections to polarized muon decay spectrum are considered.
Leading and next--to--leading logarithmic approximations are used.
Exponentiation of soft radiation is discussed. The present theoretical
uncertainty of the spectrum description is estimated.


title:
B\bar{B} Mixing and CP Violation in SU(2)_L \times SU(2)_R \times U(1)
  Models

abstract:
  We reexamine the mass mixing and CP violation in the B\bar{B} system in
general SU(2)_L \times SU(2)_R \times U(1) models related to the recent
measurements. The right-handed contributions can be sizable in B\bar{B} mixing
and CP asymmetry in B decays for a heavy W^\prime even with a mass about 3 TeV.
On the other hand the lower bound on the mass of W^\prime can be taken down to
approximately 300 GeV.


title:
Off--axis Beams and Detector Clusters: Resolving Neutrino Parameter
  Degeneracies

abstract:
  There are three parameter degeneracies inherent in the three--neutrino
analysis of long--baseline neutrino experiments. We develop a systematic method
for determining whether or not a set of measurements in neutrino oscillation
appearance experiments with approximately monoenergetic beams can completely
resolve these ambiguities. We then use this method to identify experimental
scenarios in which the parameter degeneracies may be efficiently resolved.
Generally speaking, with two appearance measurements degeneracies can occur
over wide areas of the $(\delta,\theta_{13})$ parameter space; with three
measurements they occur along lines in the parameter space and with four
measurements they occur only at isolated points. If two detectors are placed at
the same distance from the source but at different locations with respect to
the main axis of the beam (a detector cluster), each detector will measure
neutrinos at different energies. Then one run with neutrinos and one run with
antineutrinos will give the four independent measurements that in principle can
resolve all of the parameter degeneracies if $\sin^22\theta_{13} \geq 0.002$.
We also examine scenarios with detector clusters using only neutrino beams.
Without detector clusters, the measurement of neutrinos and antineutrinos at a
short distance and only neutrinos at a longer distance may also work.


title:
Finite temperature spectral function of the $\sigma$ meson from large N
  expansion

abstract:
  The spectral function of the scalar-isoscalar channel of the O(N) symmetric
linear $\sigma$ model is studied in the broken symmetry phase. The
investigation is based on the leading order evaluation of the self-energy in
the limit of large number of Goldstone bosons. We describe its temperature
dependent variation in the whole low temperature phase. This variation closely
reflects the trajectory of the scalar-isoscalar quasiparticle pole. In the
model with no explicit chiral symmetry breaking we have studied near the
critical point also the corresponding dynamical exponent.


title:
Second sheet $\sigma$ pole and the threshold enhancement of the spectral
  function in the scalar-isoscalar meson-sector

abstract:
  The scalar-isoscalar propagator of the effective linear $\sigma$ model of
meson dynamics is investigated with the help of an expansion in the number of
the Goldstone bosons. A generic scenario is suggested for the temperature and
density driven evolution of its pole in the second Riemann sheet. An extended
temperature range, correlated with characteristic pole locations, is found
where the phenomenon of threshold enhancement takes place in the corresponding
spectral function.


title:
The dependence of the "experimental" pion-nucleon sigma term on higher
  partial waves

abstract:
  A dependence of the value of the pion-nucleon sigma term on higher partial
waves is discussed. Two recent predictions of a high value of sigma term are
scrutinezed. It has been concluded that the main reason for obtaining high
values of the sigma term are input D waves that are not consistent with
analyticity.


title: Violation of Sum Rules for Twist-3 Parton Distributions

abstract:
  Sum rules for twist-3 distributions are reexamined. Integral relations
between twist-3 and twist-2 parton distributions suggest the possibility for a
$\delta$-function at $x=0$. We confirm and clarify this result by constructing
$h_L$ and $h_L^3$ (quark-gluon interaction dependent part of $h_L$) explicitly
from their moments for a one-loop dressed massive quark. The physics of these
results is illustrated by calculating $h_L(x,Q^2)$ using light-front
time-ordered pQCD to ${O}(\alpha_S)$ on a quark target.


title: Color Superconductivity in Dense QCD and Structure of Cooper Pairs

abstract:
  The two-flavor color superconductivity is examined over a wide range of
baryon density with a single model. To study the structural change of Cooper
pairs, quark correlation in the color superconductor is calculated both in the
momentum space and in the coordinate space. At extremely high baryon density,
our model becomes equivalent to the usual perturbative QCD treatment and the
gap is shown to have a sharp peak near the Fermi surface due to the
weak-coupling nature of QCD. On the other hand, the gap is a smooth function of
the momentum at lower densities due to strong color magnetic and electric
interactions. The size of the Cooper pair is shown to become comparable to the
averaged inter-quark distance at low densities, which indicates a crossover
from BCS to BEC (Bose-Einstein condensation) of tightly bound Cooper pairs may
take place at low density.


title: Effect of Hadron Dynamics on the Proton Lifetime

abstract:
  A detailed, quantitative re-examination of the effect of hadron dynamics on
baryon decay, modeled in terms of Skyrme-field tunneling, indicates that any
hadronic suppression should be quite mild. This appears to be another
illustration of the `Cheshire-cat' phenomenon, that variation of the
apportionment between description of the nucleon as a bag of quarks and
description as a Skyrme field configuration has little influence on many
nucleon properties. Perhaps the largest remaining uncertainty in evaluating the
decay rate has to do with the overlap between a specified quark-antiquark
configuration and a final meson state.


title: Getting beta-alpha without penguins

abstract:
  Oscillation effects in B0 -> Ks D0 and related processes are considered to
determine delta=beta-alpha+pi. We suggest that D0 decays to CP eigenstates used
in concert with inclusive D0 decays provide a powerful method for determining
delta cleanly i.e. without any complication from penguin processes. The CP
asymmetry is expected to be <=40% for D0 decays to non-CP eigenstates and <=80%
for decays to CP eigenstates. This method can lead to a fairly accurate
determination of delta with O(10^8-10^9) B-mesons.


title: Electromagnetic Polarization Effects due to Axion Photon Mixing

abstract:
  We investigate the effect of axions on the polarization of electromagnetic
waves as they propagate through astronomical distances. We analyze the change
in the dispersion of the electromagnetic wave due to its mixing with axions. We
find that this leads to a shift in polarization and turns out to be the
dominant effect for a wide range of frequencies. We analyze whether this effect
or the decay of photons into axions can explain the large scale anisotropies
which have been observed in the polarizations of quasars and radio galaxies. We
also comment on the possibility that the axion-photon mixing can explain the
dimming of distant supernovae.


title: Fractality and geometry in ultra-relativistic nuclear collisions

abstract:
  Assuming fractality of hadronic constituents, we argue that asymmetry of
space-time can be induced in the ultra-relativistic interactions of hadrons and
nuclei. The asymmetry is expressed in terms of the anomalous fractal dimensions
of the colliding objects. Besides state of motion, the relativistic principle
is applied to the state of asymmetry as well. Such realization of relativity
concerns scale dependence of physical laws emerging at small distances. We show
that induced asymmetries of space-time are a priori not excluded by the
Michelson's experiment even at large scales.


title: The GUT? Neutrino bi-large mixing and proton decay

abstract:
  In this talk, we introduce a new scenario of grand unified theory (GUT) with
anomalous $U(1)_A$ gauge symmetry, which can explain doublet-triplet splitting,
quark and lepton masses and mixing angles. In neutrino sector, the scenario
realizes LMA solution for solar neutrino problem and large $U_{e3}=O(0.1)$.
Moreover, the scenario predicts that the main decay mode of proton is from
dimension 6 operators and the lifetime of proton must be near the present
limit. The realization of gauge coupling unification requires that the cutoff
scale of the scenario must be around the usual GUT scale $\Lambda_G\sim 2\times
10^{16}$ GeV, which is smaller than the Planck scale. It may suggest the extra
dimension in which gauge fields in visible sector do not propagate. This talk
is based on the papers. [maekawa,maekawa2,maekawa3,BM,MY]


title:
Joint Angular Distribution of B_s -> J/\psi \phi with Subsequent \phi ->
  \rho \pi and J/\psi -> \ell^+ \ell^- Decays

abstract:
  The covariant density matrix formalism is used to obtain the joint angular
distribution of the decay B_s -> J/\psi \phi(1020) with subsequent \phi -> \rho
\pi and J/\psi -> \ell^+ \ell^- decays. The result is shown algebraically to be
a special case of our previous work on the decay distribution of B_d -> J/\psi
K_1(1270) with K_1 -> K \pi and J/\psi -> \ell^+ \ell^-.


title: Status of lattice structure function calculations

abstract:
  Lattice QCD allows computations of moments of structure functions from first
principles. An overview of the present status of the calculations is given.
Recent results and future perspectives are discussed.


title: Baryons 2002: Outlook

abstract:
  Summary and outlook presented at the 9th International Conference on the
Structure of Baryons (BARYONS 2002), Jefferson Lab, March 3-8, 2002


title: Direct Higgs production and jet veto at hadron colliders

abstract:
  We consider Higgs boson production through gluon--gluon fusion in hadron
collisions, when a veto is applied on the transverse momenta of the
accompanying hard jets. We compute the QCD corrections to this process at NLO
and NNLO, and present numerical results at the Tevatron and the LHC.


title: A Step Beyond the Bounce: Bubble Dynamics in Quantum Phase Transitions

abstract:
  We study the dynamical evolution of a phase interface or bubble in the
context of a \lambda \phi^4 + g \phi^6 scalar quantum field theory. We use a
self-consistent mean-field approximation derived from a 2PI effective action to
construct an initial value problem for the expectation value of the quantum
field and two-point function. We solve the equations of motion numerically in
(1+1)-dimensions and compare the results to the purely classical evolution. We
find that the quantum fluctuations dress the classical profile, affecting both
the early time expansion of the bubble and the behavior upon collision with a
neighboring interface.


title: Quantum fields and quantum groups

abstract:
  Quantum fields are shown to provide an example of infinite-dimensional
quantum groups. A dictionary is established between quantum field and quantum
group concepts: the expectation value over the vacuum is the counit, Wick's
theorem is the definition of a twisted product, operator and time-ordered
products are examples of twisted products. Through this dictionary,
coquasitriangular structures are introduced in quantum field theory. These
structures are the origin of Wick's theorem and quasifree states.
Renormalization becomes the replacement of a coquasitriangular structure by a
2-coboundary. Quantum groups provide a second quantization without commutators
which can second-quantize noncommutative algebras.


title:
Production and decay of spinning black holes at colliders and tests of
  black hole dynamics

abstract:
  We analyse the angular momentum distribution of black holes produced in high
energy collisions in space-times with extra spatial dimensions. We show that
the black hole spin significantly affects the energy and angular spectra of
Hawking radiation. Our results show the experimental sensitivity to the angular
momentum distribution and provide tests of black hole production dynamics.


title: \tau - \mu Flavor Violation as a Probe of the Scale of New Physics

abstract:
  Motivated by the recent strong experimental evidence of large \nu_mu-\nu_tau
neutrino mixing, we explore current bounds on the analogous mixing in the
charged lepton sector. We present a general formalism for dimension-6 fermionic
effective operators involving tau-mu mixing with typical Lorentz structure
(\bar{mu} \Gamma tau)(\bar{q}^a \Gamma {q}^b), and discuss their relationship
to the standard model gauge symmetry and the underlying flavor dynamics. We
derive the low-energy constraints on the new physics scale associated with each
operator, mostly from current experimental bounds on rare decay processes of
tau, hadrons or heavy quarks. For operators involving at least one light quark
(u,d,s), these constraints typically give a bound on the new physics scale of a
few TeV or higher. Those operators with two heavy quarks turn out to be more
weakly constrained at the present, giving bounds of a few hundred GeV. A few
scalar and pseudo-scalar operators are free from all current experimental
constraints.


title:
Parton Distributions in Light-Cone Gauge: Where Are the Final-State
  Interactions?

abstract:
  We show that the final-state interaction effects in the single target spin
asymmetry discovered by Brodsky et al. can be reproduced by either a standard
light-cone gauge definition of the parton distributions with a prescription of
the light-cone singularities consistent with the light-cone gauge link, or a
modified light-cone gauge definition with a gauge link involving the gauge
potential at the spatial infinity.


title: Remark on the Theoretical Uncertainty in B^0-\bar{B}^0 Mixing

abstract:
  We re-examine the theoretical uncertainty in the Standard Model expression
for $B^0$-$\bar{B}^0$ mixing. We focus on lattice calculations of the ratio
$\xi$, needed to relate the oscillation frequency of $B^0_s$-$\bar{B}^0_s$
mixing to the poorly known CKM element $V_{td}$. We replace the usual linear
chiral extrapolation with one that includes the logarithm that appears in
chiral perturbation theory. We find a significant shift in the ratio $\xi$,
from the conventional $1.15\pm0.05$ to $\xi=1.32\pm0.10$.


title: Electromagnetic structure of hadrons

abstract:
  In the previous papers (/quant-ph/0204037, /quant-ph/0204134,
quant-ph/0205075), based on Dirac's equation we have considered the
electromagnetic structure of the leptons. In the present paper, using the
Yang-Mills equation we will analyse the electromagnetic structure of the
hadrons.


title:
Black Hole Production at LHC: String Balls and Black Holes from pp and
  Lead-lead Collisions

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 at LHC has been extensively studied for the case of a
proton-proton collision. In this paper, we extend this analysis to a lead-lead
collision at LHC. We find that the cross section for small black holes which
may in principle be produced in such a collision is either enhanced or
suppressed, depending upon the black hole mass. For example, for black holes
with a mass around 3 TeV we find that the differential black hole production
cross section, d\sigma/dM, in a typical lead-lead collision is up to 90 times
larger than that for black holes produced in a typical proton-proton collision.
We also discuss the cross-sections for `string ball' production in these
collisions. For string balls of mass about 1 (2) TeV, we find that the
differential production cross section in a typical lead-lead collision may be
enhanced by a factor up to 3300 (850) times that of a proton-proton collision
at LHC.


title: $\bar B^0 \to \pi^+ X$ in the Standard Model

abstract:
  In this paper we investigate the possibility of studying $B\to \pi$ form
factor using the semi-inclusive decays $\bar B^0 \to \pi^+ + X_q$. In general
$B\to PX$ semi-inclusive decays involve several hadronic parameters. But for
$\bar B^0 \to \pi^+ X_q$ decays we find that in the factorization
approximation, the only unknown hadronic parameters are the form factors
$F^{B\to \pi}_{0,1}$. Therefore these form factors can be studied in $\bar B^0
\to \pi^+ X_q$ decays. Using theoretical model calculations for the form
factors the branching ratios for $\bar B^0 \to \pi^+ X_d(\Delta S = 0) $ and
$\bar B^0 \to \pi^+ X_s (\Delta S = -1)$, with the cut $E_{\pi} > 2.1$ GeV, are
estimated to be in the ranges of $(3.1\sim 4.9) \times 10^{-5}(F^{B\to
\pi}_1(0)/0.33)^2$ and $(2.5\sim 4.2)\times 10^{-5}(F_1^{B\to \pi}(0)/0.33)^2$,
respectively, depending on the value of $\gamma$. The combined branching ratio
for $\bar B^0 \to \pi^+ (X_d+ X_s)$ is about $7.4\times 10^{-5} (F^{B\to
\pi}_1(0)/0.33)^2$ and is insensitive to $\gamma$. We also discuss CP
asymmetries in these decay modes.


title: Instantons in QCD with Many Colors

abstract:
  We study instantons in QCD with many colors. We first discuss a number of
qualitative arguments concerning the large N_c scaling behavior of a random
instanton ensemble. We show that most hadronic observables are compatible with
standard large N_c counting rules provided the average instanton size is O(1)
and the instanton density is O(N_c) in the large N_c limit. This is not the
case for the topological susceptibility and the mass of the eta'. For these
observables consistency with conventional large N_c counting requires that
fluctuations in the instanton liquid are suppressed compared to Poissonian
fluctuations. Using mean field estimates and numerical simulations we show that
the required scaling behavior of the instanton density is natural in models in
which the instanton density is regularized in terms of a classical repulsive
core. We also show that in these models fluctuations of the topological charge
are suppressed and that m^2_eta'=O(1/N_c). We conclude that the instanton
liquid model is not necessarily in conflict with the 1/N_c expansion.


title:
Electromagnetic Form Factors and the Localization of Quark Orbital
  Angular Momentum in the Proton

abstract:
  A new picture is given of generalized parton distributions probed in
experiments in which the probe scale $Q^{2}$ and the momentum transfer
$\DD^{2}$ are well separated. Application of this picture to the $Q^{2}$
dependence of the form factors $F_{1}, F_{2}$ shows that gauge invariant quark
orbital angular momentum can be measured and indeed {\it localized} in the
transverse profile of the proton. A previous prediction that
$\sqrt{Q^{2}}F_{2}(Q^{2})/F_{1}(Q^{2}) \sim const. $ is generalized to GPD
language. This prediction appears to have been confirmed by recent CEBAF data.


title: Quark-Squark Alignment Revisited

abstract:
  We re-examine the possibility that the solution to the supersymmetric flavor
problem is related to small mixing angles in gaugino couplings induced by
approximate horizontal Abelian symmetries. We prove that, for a large class of
models, there is a single viable structure for the down quark mass matrix with
four holomorphic zeros. Consequently, we are able to obtain both lower and
upper bounds on the supersymmetric mixing angles and predict the contributions
to various flavor changing neutral current processes. We find that the most
likely signals for alignment are $\Delta m_D$ close to the present bound,
significant CP violation in $D^0-\bar{D^0}$ mixing, and shifts of order a few
percent in various CP asymmetries in $B^0$ and $B_s$ decays. In contrast, the
modifications to radiative B decays, to $\epsilon^\prime/\epsilon$ and to
$K\to\pi\nu\bar\nu$ decays are small. We further investigate a new class of
alignment models, where supersymmetric contributions to flavor changing
processes are suppressed by both alignment and RGE-induced degeneracy.


title: Effective Fields in Dense Quantum Chromodynamics

abstract:
  In the high density, low temperature limit, Quantum Chromodynamics exhibits a
transition to phases characterized by color superconductivity and energy gaps
in the fermion spectra. We review some fundamental results obtained in this
area and in particular we describe the low energy effective lagrangian
describing the motion of the quasi-particles in the high density medium (High
Density Effective Theory).


title: A Solution to the Coincidence Puzzle of \Omega_{B} and \Omega_{DM}

abstract:
  We show that a class of Affleck--Dine baryogenesis directly relates the
observed mass density of baryons, \Omega_{B}, to that of dark matter,
\Omega_{DM}. In this scenario, the ratio of baryon to dark matter mass density
is solely determined by the low energy parameters, except for an O(0.1)
effective CP-violating phase. We find that \Omega_{B}/\Omega_{DM}=O(0.1) with
reasonable parameters, which lies surprisingly just in the range of
observation. This scenario is totally free from the cosmological gravitino
problem, and independent of the detailed history of the Universe as long as it
satisfies quite weak constraints.


title: Two-Loop QCD Helicity Amplitudes for $e^+e^- \to 3$~Jets

abstract:
  We compute the two-loop QCD helicity amplitudes for the process e^+e^- --> q
bar{q} g. The amplitudes are extracted in a scheme-independent manner from the
coefficients appearing in the general tensorial structure for this process. The
tensor coefficients are derived from the Feynman graph amplitudes by means of
projectors, within the conventional dimensional regularization scheme. The
actual calculation of the loop integrals is then performed by reducing all of
them to a small set of known master integrals. The infrared pole structure of
the renormalized helicity amplitudes agrees with the prediction made by Catani
using an infrared factorization formula. We use this formula to structure our
results for the finite part into terms arising from the expansion of the pole
coefficients and a genuine finite remainder, which is independent of the scheme
used to define the helicity amplitudes. The analytic result for the finite
parts of the amplitudes is expressed in terms of one- and two-dimensional
harmonic polylogarithms.


title: Ground-state energy of pionic hydrogen to one loop

abstract:
  We investigate the ground-state energy of the pi- p atom (pionic hydrogen) in
the framework of QCD+QED. In particular, we evaluate the strong energy-level
shift. We perform the calculation at next-to-leading order in the low-energy
expansion in the framework of the relevant effective field theory. The result
provides a relation between the strong energy shift and the pion-nucleon S-wave
scattering lengths - evaluated in pure QCD - at next-to-leading order in
isospin breaking and in the low-energy expansion. We compare our result with
available model calculations.


title: Hadron properties in nuclear medium and their impacts on observables

abstract:
  The effect of changes in hadron properties in a nuclear medium on physical
observables is discussed. Highlighted results are, (1) hypernuclei, (2)
meosn-nuclear bound states, (3) $K$-meson production in heavy ion collisions,
and (4) $J/\Psi$ dissociation in a nuclear medium. In addition, results for the
near-threshold $\omega$- and $\phi$-meson productions in proton proton
collisions are reported.


title: LUSIFER: a LUcid approach to SIx-FERmion production

abstract:
  LUSIFER is a Monte Carlo event generator for all processes e+e-->6fermions,
which is based on the multi-channel Monte Carlo integration technique and
employs the full set of tree-level diagrams. External fermions are taken to be
massless, but can be arbitrarily polarized. The calculation of the helicity
amplitudes and of the squared matrix elements is presented in a compact way.
Initial-state radiation is included at the leading logarithmic level using the
structure-function approach. The discussion of numerical results contains a
comprehensive list of cross sections relevant for a 500GeV collider, including
a tuned comparison to results obtained with the combination of the WHIZARD and
MADGRAPH packages as far as possible. Moreover, for off-shell top-quark pair
production and the production of a Higgs boson in the intermediate mass range
we additionally discuss some phenomenologically interesting distributions.
Finally, we numerically analyze the effects of gauge-invariance violation by
comparing various ways of introducing decay widths of intermediate top quarks,
gauge and Higgs bosons.


title: Is the Lightest Kaluza-Klein Particle a Viable Dark Matter Candidate?

abstract:
  In models with universal extra dimensions (i.e. in which all Standard Model
fields, including fermions, propagate into compact extra dimensions) momentum
conservation in the extra dimensions leads to the conservation of Kaluza--Klein
(KK) number at each vertex. KK number is violated by loop effects because of
the orbifold imposed to reproduce the chiral Standard Model with zero modes,
however, a KK parity remains at any order in perturbation theory which leads to
the existence of a stable lightest KK particle (LKP). In addition, the
degeneracy in the KK spectrum is lifted by radiative corrections so that all
other KK particles eventually decay into the LKP. We investigate cases where
the Standard Model lives in five or six dimensions with compactification radius
of TeV$^{-1}$ size and the LKP is the first massive state in the KK tower of
either the photon or the neutrino. We derive the relic density of the LKP under
a variety of assumptions about the spectrum of first tier KK modes. We find
that both the KK photon and the KK neutrino, with masses at the TeV scale, may
have appropriate annihilation cross sections to account for the dark matter,
$\Omega_M \sim 0.3$.


title:
Ultrahigh Energy Cosmic Rays: The state of the art before the Auger
  Observatory

abstract:
  In this review we discuss the important progress made in recent years towards
understanding the experimental data on cosmic rays with energies $\agt 10^{19}$
eV. We begin with a brief survey of the available data, including a description
of the energy spectrum, mass composition, and arrival directions. At this point
we also give a short overview of experimental techniques. After that, we
introduce the fundamentals of acceleration and propagation in order to discuss
the conjectured nearby cosmic ray sources. We then turn to theoretical notions
of physics beyond the Standard Model where we consider both exotic primaries
and exotic physical laws. Particular attention is given to the role that
TeV-scale gravity could play in addressing the origin of the highest energy
cosmic rays. In the final part of the review we discuss the potential of future
cosmic ray experiments for the discovery of tiny black holes that should be
produced in the Earth's atmosphere if TeV-scale gravity is realized in Nature.


title: The Colour Glass Condensate

abstract:
  I briefly review the physical picture of the saturated gluons at small-x as a
Colour Glass Condensate, and the effective theory which forms the basis of this
picture.


title:
The Transverse Quark Distribution and Proton Electromagnetic Form
  Factors in Skew Distribution Formalism

abstract:
  Skew density matrices can be diagonalized to yield probability
interpretation. The power-counting prediction of perturbative QCD is found
consistent with recent CEBAF data on $F_2(Q^2)/F_1(Q^2)$


title: Dissipation at Two-Loop Level: Undressing the Chiral Condensate

abstract:
  A simple and consistent real time analysis of the long-wavelength chiral
condensate fields in the background of hard thermal modes is presented in the
framework of the linear sigma model. Effective evolution equations are derived
for the inhomogeneous condensate fields coupled to a heat bath. Multiple
effects of the thermal background on the disoriented chiral condensate are
studied using linear response theory. We determine the temperature dependence
of the equilibrium condensate, and examine the modification of the sigma and
pion dispersion relations as these mesons traverse a hot medium. We calculate
the widths by determining the dissipative coefficients at nonzero temperature
at one- and two-loop order with resummed meson masses. Our results show that
not only decay processes, but elastic scattering processes are significant at
high temperatures, yielding to short relaxation times in the phase transition
region. The relaxation times obtained are shorter than in previous estimates,
making the observation of DCC signals questionable. Throughout this work
Goldstone's Theorem is fulfilled when chiral symmetry is spontaneously broken.


title: Away-from-jet energy flow

abstract:
  We consider interjet observables in hard QCD processes given by the energy
flow E_out in a region away from all hard jets. Here the QCD radiation is
depleted (E_out << Q), and therefore these observables provide ideal means to
study non-perturbative effects. We derive an evolution equation (in the large
N_c limit) which resums, for large Q/E_out, all leading terms arising from
large angle soft emission (double logarithms are absent). We discuss the
analytical features of the result and identify universal and geometry-dependent
contributions. Our analysis confirms features found using numerical methods by
Dasgupta and Salam.


title: Theoretical Models of Neutrino Masses and Mixings

abstract:
  We review theoretical ideas, problems and implications of different models
for neutrino masses and mixing angles. We give a general discussion of schemes
with three or more light neutrinos. Several specific examples are analyzed in
some detail, particularly those that can be embedded into grand unified
theories.


title:
The LMA Solution from Bimaximal Lepton Mixing at the GUT Scale by
  Renormalization Group Running

abstract:
  We show that in see-saw models with bimaximal lepton mixing at the GUT scale
and with zero CP phases, the solar mixing angle theta_{12} generically evolves
towards sizably smaller values due to Renormalization Group effects, whereas
the evolution of theta_{13} and theta_{23} is comparatively small. The
currently favored LMA solution of the solar neutrino problem can thus be
obtained in a natural way from bimaximal mixing at the GUT scale. We present
numerical examples for the evolution of the leptonic mixing angles in the
Standard Model and the MSSM, in which the current best-fit values of the LMA
mixing angles are produced. These include a case where the mass eigenstates
corresponding to the solar mass squared difference have opposite CP parity.


title: A proof of fulfillment of the strong bootstrap condition

abstract:
  It is shown that the kernel of the BFKL equation for the octet color state of
two Reggeized gluons satisfies the strong bootstrap condition in the
next-to-leading order. This condition is much more restrictive than the one
obtained from the requirement of Reggeized form for the elastic scattering
amplitudes in the next-to-leading approximation. It is necessary, however, for
self-consistency of the assumption of Reggeized form of the production
amplitudes in multi-Regge kinematics, which are used in the derivation of the
BFKL equation. The fulfillment of the strong bootstrap condition for the kernel
opens a way to a rigorous proof of the BFKL equation in the next-to-leading
approximation.


title: A hidden hierarchy of neutrino masses

abstract:
  The Dirac masses of neutrinos can exhibit a strong hierarchy even if the
Majorana masses of the right-handed neutrinos are degenerate and the hierarchy
of the mass scales governing the oscillations of solar and atmospheric
neutrinos is rather small. This phenomenon results from the see-saw mechanism
and the algebraic structure of the effective mass operator for the active
neutrinos. The large hierarchy of the Dirac masses is drastically modified by a
symmetric unitary matrix $R$ acting in the flavor space. A realistic pattern of
neutrino masses and mixing is obtained. Maximal mixing for atmospheric
neutrinos is attributed to the charged lepton sector. Large mixing in solar
neutrino oscillations is due to the neutrino sector. Small $U_{e3}$ is a
natural consequence of the model. The masses of the active neutrinos are given
by $\mu_3\approx\sqrt{\Delta m_{@}^2}$ and $\mu_1/\mu_2\approx
\tan^2\theta_\odot$.


title:
Appell Functions and the Scalar One-Loop Three-point Integrals in
  Feynman Diagrams

abstract:
  The scalar three-point function appearing in one-loop Feynman diagrams is
compactly expressed in terms of a generalized hypergeometric function of two
variables. Use is made of the connection between such Appell function and
dilogarithms coming from a previous investigation. Special cases are obtained
for particular values of internal masses and external momenta.


title: Hydrodynamical description of Galactic Dark Matter

abstract:
  We consider simple hydrodynamical models of galactic dark matter in which the
galactic halo is a self-gravitating and self-interacting gas that dominates the
dynamics of the galaxy. Modeling this halo as a sphericaly symmetric and static
perfect fluid satisfying the field equations of General Relativity, visible
barionic matter can be treated as ``test particles'' in the geometry of this
field. We show that the assumption of an empirical ``universal rotation curve''
that fits a wide variety of galaxies is compatible, under suitable
approximations, with state variables characteristic of a non-relativistic
Maxwell-Boltzmann gas that becomes an isothermal sphere in the Newtonian limit.
Consistency criteria lead to a minimal bound for particle masses in the range
$30 \hbox{eV} \alt m \alt 60 \hbox{eV}$ and to a constraint between the central
temperature and the particles mass. The allowed mass range includes popular
supersymmetric particle candidates, such as the neutralino, axino and
gravitino, as well as lighter particles ($m\sim$ keV) proposed by numerical
N-body simulations associated with self-interactive ``cold'' and ``warm'' dark
matter structure formation theories.


title: Dirac Neutrino Anapole Moment

abstract:
  We calculate the Dirac neutrino anapole moment (a_{\nu_l}) in the context of
the Standard Model (SM) making use of the Dirac form factor F_D(q^2) introduced
recently by J. Bernabeu, L. G. Cabral-Rosetti, J. Papavassiliou y J. Vidal by
using the Pinch Technique (PT) formalism, working in two different gauge-fixing
schemes (R_\xi guage and the electroweak BFM), at the one loop level. We show
that the neutrino anapole form factor F_A(q^2) and Dirac form factor F_D(q^2)
are related as follows: F_A(q^2) = \frac{1}{q^2} F_D(q^2). Hence, the Dirac
neutrino charge radius < r^2_{\nu_l} > and the anapole moment satisfy the
simple relation a_{\nu_l} = {1/6} < r^2_{\nu_l} >. Therefore, we show that the
anapole moment (as the charge radius) of the neutrino is a physical quantity,
which only gets contribution from the proper neutrino electromagnetic vertex
(in electroweak BFM), and that a_{\nu_l} is of the order 10^{-34} cm^2.


title:
Neutrino Large Mixing in Universal Yukawa Coupling Model with Small
  Violation

abstract:
  We have analyzed the possibility that the universal Yukawa coupling
(democratic mass matrix) with small violations of Dirac and Majorana neutrinos
can induce the large mixing of neutrinos through the seesaw mechanism. The
possibility can be achieved by the condition that the violation parameters of
Majorana neutrinos are sufficiently smaller than the violation parameters of
Dirac neutrinos. Allowed regions of the violation parameters producing the
observed neutrino mass hierarchy and large neutrino mixing are not so
restricted at present in contrast to the violation parameters for quark sector.


title: Four Puzzles of Neutrino Mixing

abstract:
  There are four puzzling questions about by the magnitudes of neutrino mixings
and mass splittings. A brief sketch is given of the various kinds of models of
neutrino masses and how they answer these questions. Special attention is given
to so-called "lopsided" models.


title: A realistic formulation of approximate CP

abstract:
  CP violation in the SM is naturally implemented as a small imaginary
perturbation to real Yukawa couplings. For example, a large CP asymmetry in B_d
decays can arise if the imaginary parts of quark mass matrices are of order
10^(-3)m_t,b or smaller. Applying the same principle of ``additive CP
violation'' to soft SUSY-breaking terms, the electric dipole moments of the
neutron and mercury atom are predicted near current experimental limits; for
nonuniversal A-terms, EDM bounds can be satisfied given certain flavour
structures. The proposal is conveniently formulated in a democratic basis, with
Yukawas and soft terms of the form const. x (1+eps+i zeta) where eps<<1,
zeta<~10^(-3), motivated by approximate permutation x CP symmetry.


title:
A Flavor Symmetry Model for Bilarge Leptonic Mixing and the Lepton
  Masses

abstract:
  We present a model for leptonic mixing and the lepton masses based on flavor
symmetries and higher-dimensional mass operators. The model predicts bilarge
leptonic mixing (i.e., the mixing angles theta_{12} and theta_{23} are large
and the mixing angle theta_{13} is small) and an inverted hierarchical neutrino
mass spectrum. Furthermore, it approximately yields the experimental
hierarchical mass spectrum of the charged leptons. The obtained values for the
leptonic mixing parameters and the neutrino mass squared differences are all in
agreement with atmospheric neutrino data, the Mikheyev--Smirnov--Wolfenstein
large mixing angle solution of the solar neutrino problem, and consistent with
the upper bound on the reactor mixing angle. Thus, we have a large, but not
close to maximal, solar mixing angle theta_{12}, a nearly maximal atmospheric
mixing angle theta_{23}, and a small reactor mixing angle theta_{13}. In
addition, the model predicts theta_{12} ~= pi/4 - theta_{13}.


title: Pion transition form factor: interplay of hard and soft limits

abstract:
  The behaviour of the pion transition form factor for the process
$\gamma^\star\gamma \to \pi^0$ and $\gamma^\star\gamma^\star\to \pi^0$ at
space-like values of photon momenta is estimated within the nonlocal covariant
quark-meson model. The nonlocal contributions are important to install the
axial anomaly at zero photon virtualities and give the contributions to the
twist-4 power correction to the form factor at large virtualities. The leading
and next-to-leading order power asymptotics of the form factor and the relation
between the light-cone pion distribution amplitudes and the dynamically
generated quark mass function are found.


title:
Hypothetical first order $|\Delta S|=2$ transitions in the
  $K^{0}-\bar{K^{0}}$ complex

abstract:
  The influence of a hypothetical CP violating $|\Delta S|=2$ interaction on
the time evolution of the $K^{0} - \bar{K^{0}}$ system is investigated. It is
shown, that if we were to assume the existence of the superweak-like
interaction then this would lead to the conclusion, that there might be
observable effects in the masses of the neutral kaons. We address the
possibility of experimental observation of these effects and perform a computer
simulation of one of the parameters which describe such effects. Instead of the
widely used Lee, Oehme and Yang approximation, which is not suitable to
considering this kind of interaction we use a formalism based on the
Krolikowski-Rzewuski equation.


title: Chiral Lagrangian from gauge invariant,nonlocal, dynamical quark model

abstract:
  Parameters of Gasser Leutwyler chiral Lagrangian are proved saturated by
dynamical quark self energy Sigma(k^2) in a gauge invariant, nonlocal,
dynamical quark model.


title: Seesaw induced Higgs Mechanism

abstract:
  We discuss a two scalar doublets model which induces the Higgs mechanism by
means of a seesaw mechanism. This model naturally predicts a light Higgs scalar
whose mass is suppressed by the grand unification scale. The model predicts an
intermediate scale between the electroweak symmetry breaking scale and the
grand unification scale at $10^9$ GeV. Below this intermediate energy scale the
usual standard model appears as an effective theory. A seesaw mechanism in the
scalar sector of the model not only induces the standard Higgs mechanism, but
also solves the hierarchy problem. An implementation of this mechanism in
models where the Planck scale is in the TeV region is discussed.


title: Cold Dark Matter and Neutralinos

abstract:
  Neutralinos are natural candidates for cold dark matter in many realizations
of supersymmetry. We briefly review our recent results in the evaluation of
neutralino relic abundance and direct detection rates in a class of
supergravity models.


title: J/psi Pair Production at the Tevatron

abstract:
  The double J/psi production in p\bar{p} collision is revisited. It is found
that the J/\psi pair production rate at leading order with p_T > 4 GeV in
conventional scheme is larger than the rate derived from color-octet mechanism
by a factor of five. As the double J/psi production is shown to be attainable
with data yet collected at the Tevatron detectors, experimental study on it
would be helpful to clarify the validity of the conventional color-singlet
description for heavy quarkonium production.


title:
Hadronic $\tau$ decay, the renormalization group, analiticity of the
  polarization operators and QCD parameters

abstract:
  The ALEPH data on hadronic tau-decay is throughly analysed in the framework
of QCD. The perturbative calculations are performed in 1-4-loop approximation.
The analytical properties of the polarization operators are used in the whole
complex q^2 plane. It is shown that the QCD prediction for R_{tau} agrees with
the measured value R_{tau} not only for conventional Lambda^{conv}_3 =
(618+-29) MeV but as well as for Lambda^{new}_3 = (1666+-7) MeV. The
polarization operator calculated using the renormgroup has nonphysical cut
[-Lambda^2_3, 0]. If Lambda_3 = Lambda^{conv}_3, the contribution of only
physical cut is deficient in the explanation of the ALEPH experiment. If
Lambda_3 = Lambda^{new}_3 the contribution of nonphysical cut is very small and
only the physical cut explains the ALEPH experiment. The new sum rules which
follow only from analytical properties of polarization operators are obtained.
Basing on the sum rules obtained, it is shown that there is an essential
disagreement between QCD perturbation theory and the tau-lepton hadronic decay
experiment at conventional value Lambda_3. In the evolution upwards to larger
energies the matching of r(q^2) (Eq.(12)) at the masses J/psi, Upsilon and 2m_t
was performed. The obtained value alpha_s(-m^2_z) = 0.141+-0.004 (at Lambda_3 =
Lambda^{new}_3) differs essentially from conventional value, but the
calculation of the values R(s) = sigma(e+e- -> hadrons)/sigma(e+e- -> mu+mu-),
R_l = Gamma(Z -> hadrons)/Gamma(Z -> leptons), alpha_s(-3 GeV^2), alpha_s(-2.5
GeV^2) does not contradict the experiments.


title: Theory Status of eps'/eps

abstract:
  I shortly review the present status of the theoretical calculations of
eps'/eps and the comparison with the present experimental results. I discuss
the role of higher order chiral corrections and in general of non-factorizable
contributions for the explanation of the Delta I = 1/2 selection rule and
direct CP violation in kaon decays. Still lacking satisfactory lattice
calculations, analytic methods and phenomenological approaches are helpful in
understanding correlations among theoretical effects and experimental data.
Substantial progress from lattice QCD is expected in the coming years.


title: Dirac Gaugino Masses and Supersoft Supersymmetry Breaking

abstract:
  We introduce a new supersymmetric extension of the standard model in which
the gauge sector contains complete N=2 supersymmetry multiplets. Supersymmetry
breaking from the D-term vev of a hidden sector U(1) gauge field leads to Dirac
soft supersymmetry breaking gaugino masses, and a new type of soft scalar
trilinear couplings. The resulting squark and slepton masses are finite,
calculable, positive and flavor universal. The Higgs soft mass squared is
negative. The phenomenology of these theories differs significantly from the
MSSM. We discuss a variety of possible origins for the soft operators and new
fields, including models in both four and higher dimensions.


title:
Weak magnetism effects in the direct Urca processes in cooling neutron
  stars

abstract:
  In the mean field approximation, we study the effects of weak magnetism and
pseudoscalar interaction in the neutrino energy losses caused by the direct
Urca processes on relativistic nucleons in the degenerate baryon matter. Our
formula for the neutrino energy losses incorporates the effects of nucleon
recoil, parity violation, weak magnetism, and pseudoscalar interaction. For
numerical testing of our formula, we use a self-consistent relativistic model
of the multicomponent baryon matter. We found that, due to weak magnetism
effects, relativistic emissivities increase by approximately 40-50%, while the
pseudoscalar interaction only slightly suppresses the energy losses,
approximately by 5%.


title:
Renormalization scheme dependence in the case of a QCD non-power
  perturbative expansion

abstract:
  A novel, non-power, expansion of QCD quantities replacing the standard
perturbative expansion in powers of the renormalized couplant a has recently
been introduced and examined by two of us. Being obtained by analytic
continuation in the Borel plane, the new expansion functions W_n(a) share the
basic analyticity properties with the expanded quantity. In this note we
investigate the renormalization scale dependence of finite order sums of this
new expansion for the phenomenologically interesting case of the tau-lepton
decay rate.


title: Gauge coupling renormalization in RS1

abstract:
  We compute the 4D low energy effective gauge coupling at one-loop order in
the compact Randall-Sundrum scenario with bulk gauge fields and charged matter,
within controlled approximations. While such computations are subtle, they can
be important for studying phenomenological issues such as grand unification.
Ultraviolet divergences are cut-off using Pauli-Villars regularization so as to
respect 5D gauge and general coordinate invariance. The structure of these
divergences on branes and in the bulk is elucidated by a 5D position-space
analysis. The remaining finite contributions are obtained by a careful analysis
of the Kaluza-Klein spectrum. We comment on the agreement between our results
and expectations based on the AdS/CFT correspondence, in particular logarithmic
sensitivity to the 4D Planck scale.


title: QED box amplitude in heavy fermion production

abstract:
  We evaluate the two-photon box contribution to heavy fermion production in
electron positron annihilation, that provides O(alpha^2) electromagnetic
corrections to the Born cross section. The study of its non-relativistic
expansion, relevant at energies close to the threshold of production, is also
performed. We also verify that the threshold expansion of the one-loop
integrals correctly reproduces our results, thus extending the applicability of
this technique to heavy fermion production diagrams.


title:
On the two-loop sbottom corrections to the neutral Higgs boson masses in
  the MSSM

abstract:
  We compute the O(ab*as) two-loop corrections to the neutral Higgs boson
masses in the Minimal Supersymmetric Standard Model, using the effective
potential approach. Such corrections can be important in the region of
parameter space corresponding to tan(beta)>>1 and sizeable mu. In spite of the
formal analogy with the O(at*as) corrections, there are important differences,
since the dominant effects are controlled by the sbottom-Higgs scalar
couplings. We propose a convenient renormalization scheme that avoids
unphysically large threshold effects associated with the bottom mass, and
absorbs the bulk of the O(ab*as + ab*at) corrections into the one-loop
expression. We give general explicit formulae for the O(ab*as) corrections to
the neutral Higgs boson mass matrix. We also discuss the importance of the
O(ab^2) corrections and derive a formula for their contribution to mh in a
simple limiting case.


title: The Minimal Supersymmetric Model without a mu term

abstract:
  We propose a supersymmetric extension of the standard model which is a
realistic alternative to the MSSM, and which has several advantages. No ``mu''
supersymmetric Higgs/Higgsino mass parameter is needed for sufficiently heavy
charginos. An approximate U(1) R symmetry naturally guarantees that tan beta is
large, explaining the top/bottom quark mass hierarchy. This symmetry also
suppresses supersymmetric contributions to anomalous magnetic moments, b to s
gamma, and proton decay, and these processes place no lower bounds on
superpartner masses, even at large tan beta. The soft supersymmetry breaking
mass parameters can easily be obtained from either gauge or Planck scale
mediation, without the usual mu problem. Unlike in the MSSM, there are
significant upper bounds on the masses of superpartners, including an upper
bound of 114 GeV on the mass of the lightest chargino. However the MSSM bound
on the lightest Higgs mass does not apply.


title: A New Interpretation on Quantum Mechanics

abstract:
  Based on new experiments about the "macroscopic Schrodinger's cat state"
etc., a self-consistent interpretation on quantum mechanics is presented from
the new point of view combining physics, philosophy and mathematics together.


title: Further evidence for a large glue component in the f0(1500) meson

abstract:
  We argue that the experimental decay rates of the f0(1500) meson into two
pseudoscalar mesons and into two photons are incompatible with a
quark-antiquark state and that the f0(1710) meson is dominantly an ssbar state.


title: CP violation in the radiative dileptonic B-meson decays

abstract:
  We investigate the CP violating asymmetry, the forward backward asymmetry and
the CP violating asymmetry in the forward-backward asymmetry for the radiative
dileptonic B-meson decays $B_{d}\to \gamma \ell^+ \ell^-$ for the $\ell= e,
\mu, \tau$ channels. It is observed that these asymmetries are quite sizable
and $B_{d}\to \gamma \ell^+ \ell^-$ decays seem promising for investigating CP
violation.


title: A Quantization of 2+1-Gravity Related to High-Energy Yang-Mills Theory

abstract:
  We point out that canonical quantization of the two-body problem in
2+1-Gravity is related to the high-energy equation in Yang-Mills theory by a
proper ordering of the relevant operators. This feature arises from expanding
the Hamiltonian around its conformal limit - or treating running coupling
effects in the Yang-Mills case - and yields a peculiar short distance behaviour
of the wave functions.


title:
Spontaneous Symmetry Breakings in the Linear Sigma Model at finite
  baryonic density

abstract:
  The linear sigma model with pions and sigma coupled to baryons and a
(massive) gauge vector meson is considered for the description of a finite
baryonic density system. The stability equation for the bound system is studied
in the homogeneous limit considering quantum fluctuations for the scalar and
pseudo scalar fields within a variational method with truncations. Nearly exact
solutions for the stability equation which also solve the field equations are
sought semi-analytically. Bosonic fields are found to have non zero expected
classical values at finite density corresponding to condensates of dynamical
symmetry breakings. The two components of baryon field, neutron and proton for
example, acquire different masses due to the isospin symmetry breaking and
these states may even oscillate in the medium. There is a non trivial solution
for the (massive) vector meson field indicating the occurrence of a gauge
dynamical symmetry breaking at finite density typical of a superconductor.


title:
Convergence of the Linear Delta Expansion in the Critical O(N) Field
  Theory

abstract:
  The linear delta expansion is applied to the 3-dimensional O(N) scalar field
theory at its critical point in a way that is compatible with the large-N
limit. For a range of the arbitrary mass parameter, the linear delta expansion
for <phi^2> converges, with errors decreasing like a power of the order n in
delta. If the principal of minimal sensitivity is used to optimize the
convergence rate, the errors seem to decrease exponentially with n.


title: Omega, J/psi and psi' Transverse Mass Spectra at RHIC

abstract:
  The transverse mass spectra of J/psi and psi' mesons and Omega hyperons
produced in central Au+Au collisions at RHIC energies are discussed within a
statistical model used successfully for the interpretation of the SPS results.
The comparison of the presented model with the future RHIC data should serve as
a further crucial test of the hypothesis of statistical production of charmonia
at hadronization. Finally, in case of validity, the approach should allow to
estimate the mean transverse flow velocity at the quark gluon plasma
hadronization.


title:
A New Parametrization of the Seesaw Mechanism and Applications in
  Supersymmetric Models

abstract:
  We present a new parametrization of the minimal seesaw model, expressing the
heavy-singlet neutrino Dirac Yukawa couplings $(Y_\nu)_{ij}$ and Majorana
masses $M_{N_i}$ in terms of effective light-neutrino observables and an
auxiliary Hermitian matrix $H.$ In the minimal supersymmetric version of the
seesaw model, the latter can be related directly to other low-energy
observables, including processes that violate charged lepton flavour and CP.
This parametrization enables one to respect the stringent constraints on
muon-number violation while studying the possible ranges for other observables
by scanning over the allowed parameter space of the model. Conversely, if any
of the lepton-flavour-violating process is observed, this measurement can be
used directly to constrain $(Y_\nu)_{ij}$ and $M_{N_i}.$ As applications, we
study flavour-violating $\tau$ decays and the electric dipole moments of
leptons in the minimal supersymmetric seesaw model.


title: Physics of Event Generators

abstract:
  An event generator for nuclear collisions is a microscopic model, obtained
from extrapolating elementary interactions -- as electron-positron
annihilation, deep inelastic scattering, and proton-proton interactions --
towards proton-nucleus and nucleus-nucleus scattering, by using Monte Carlo
techniques.
  In this paper, we will discuss the physical concepts behind such event
generators. We first present some qualitative discussion of nuclear scattering,
before discussing particle production and strings. We then discuss the parton
model, and finally multiple scattering theory.


title:
Dominant Contributions to Lateral Distribution Functions in Ultra-High
  Energy Cosmic Ray Air Showers

abstract:
  In hadron induced air showers of highest energies (E> 1e18 eV), the lateral
distribution functions of electrons and muons are a superposition of many
separate electromagnetic sub-showers, initiated by meson decay at different
altitudes and energies. The lateral distribution function is the primary tool
for reconstructing the energy of the primary in a UHE cosmic ray shower, so
understanding it in detail is a prerequisite for having confidence in the
energy determination. We analyze in this paper the dominant contributions to
the ground level lateral distribution functions, as a function of the altitude
and energy at which the sub-showers are initiated. Far from the core, the
dominant contribution to the density of electrons comes from sub-showers
initiated at low altitudes and low energies (E<100 GeV). The dominant
sub-showers are initiated at large radial distance from the core and at a large
angle with respect to the main shower axis. This demonstrates the need for
careful treatment of low energy hadron physics modeling even for ultrahigh
energy primaries.


title: Variation of Fundamental Couplings and Nuclear Forces

abstract:
  The dependence of the nuclear force on standard model parameters plays an
important role in bounding time and space variations of fundamental couplings
over cosmological time scales. We discuss the quark-mass dependence of deuteron
and di-neutron binding in a systematic chiral expansion. The leading quark-mass
dependence of the nuclear force arises from one-pion exchange and from local
quark-mass dependent four-nucleon operators with coefficients that are
presently unknown. By varying these coefficients while leaving nuclear
observables at the physical values of the quark masses invariant, we find
scenarios where two-nucleon physics depends both weakly and strongly on the
quark masses. While the determination of these coefficients is an exciting
future opportunity for lattice QCD, we conclude that, at present, bounds on
time and space variations of fundamental parameters from the two-nucleon sector
are much weaker than previously claimed. This brings into question the
reliability of coupling-constant bounds derived from more complex nuclei and
nuclear processes.


title:
New Generation of Parton Distributions with Uncertainties from Global
  QCD Analysis

abstract:
  A new generation of parton distribution functions with increased precision
and quantitative estimates of uncertainties is presented. This work includes a
full treatment of available experimental correlated systematic errors for both
new and old data sets and a systematic and pragmatic treatment of uncertainties
of the parton distributions and their physical predictions. The new gluon
distribution is considerably harder than that of previous standard fits.
Extensive results on the uncertainties of parton distributions at various
scales, and on parton luminosity functions at the Tevatron RunII and the LHC,
are obtained. The latter provide the means to quickly estimate the
uncertainties of a wide range of physical processes at these high-energy hadron
colliders, such as the production cross sections of the $W,Z$ at the Tevatron
and the LHC, and that of a light Higgs.


title: Radiative decay of Upsilon(nS) into S-wave sbottomonium

abstract:
  A calculation is presented of the radiative decay of the Upsilon(nS) into a
bound state of bottom squarks. Predictions are provided of the branching
fraction as a function of the masses of the bottom squark and the gluino.
Branching fractions as large as several times 10^{-4} are obtained for
supersymmetric particle masses in the range suggested by the analysis of
bottom-quark production cross sections. Data are shown that limit the range of
allowed masses. Forthcoming high-statistics data from the CLEO Collaboration
offer possibilities of discovery or significant new bounds on the existence and
masses of supersymmetric particles.


title: Yet Another Extension of the Standard Model: Oases in the Desert?

abstract:
  We have searched for conceptually simple extensions of the standard model,
and describe here a candidate model which we find attractive. Our starting
point is the assumption that off-diagonal CKM mixing matrix elements are
directly related by lowest order perturbation theory to the quark mass
matrices. This appears to be most easily and naturally implemented by assuming
that all off-diagonal elements reside in the down-quark mass matrix. This
assumption is in turn naturally realized by introducing three generations of
heavy, electroweak-singlet down quarks which couple to the Higgs sector
diagonally in flavor, while mass-mixing off-diagonally with the light
down-quarks. Anomaly cancellation then naturally leads to inclusion of
electroweak vector-doublet leptons. It is then only a short step to completing
the extension to three generations of fundamental representations of E(6).
Assuming only that the third generation B couples to the Higgs sector at least
as strongly as does the top quark, the mass of the B is roughly estimated to
lie between 1.7 TeV and 10 TeV, with lower-generation quarks no heavier. The
corresponding guess for the new leptons is a factor two lower. Within the
validity of the model, flavor and CP violation are ``infrared'' in nature,
induced by semi-soft mass mixing terms, not Yukawa couplings. If the Higgs
couplings of the new quarks are flavor symmetric, then there necessarily must
be at least one ``oasis'' in the desert, induced by new radiative corrections
to the top quark and Higgs coupling constants, and roughly at 1000 TeV.


title: Saturation and Vector Mesons

abstract:
  Through an analysis of diffractive vector meson production, we show that the
proton appears quite dense to a small size probe at present HERA energies. This
means that saturation effects are already important.


title:
Renormalization Group Equation of Quark-Lepton Mass Matrices in the
  SO(10) Model with Two Higgs Scalars

abstract:
  The renormalization group equations (RGEs) of the mass matrices of quarks and
leptons in a SO(10) model with two Higgs scalars in the Yukawa coupling are
studied. This model is the minimal model of SUSY and non-SUSY SO(10) GUT which
can reproduce all the experimental data. Non-SUSY SO(10) GUT model has the
intermediate energy phase, Pati-Salam phase, and passes through the symmetry
breaking pattern, $SO(10) \to SU(2)_L \times SU(2)_R \times SU(4)_C \to SU(2)_L
\times U(1)_Y \times SU(3)_C$. Though minimal, it has, after the Pati-Salam
phase, four Higgs doublets in Yukawa interactions. We consider the RGE's of the
Yukawa coupling constants of quarks and charged leptons and of the coupling
constants of the dimension five operators of neutrinos corresponding to the
above symmetry breaking pattern. The scalar quartic interactions are also
incorporated.


title: Effects of Squark Processes on the Axino CDM Abundance

abstract:
  We investigate the role of an effective dimension-4 axino-quark-squark
coupling in the thermal processes producing stable cold axino relics in the
early Universe. We find that, while the induced squark and quark scattering
processes are always negligible, squark decays become important in the case of
low reheat temperature and large gluino mass. The effect can tighten the bounds
on the scenario from the requirement that cold dark matter axinos do not
overclose the Universe.


title: Integrable mixing of A_{n-1} type vertex models

abstract:
  Given a family of monodromy matrices {T_u; u=0,1,...,K-1} corresponding to
integrable anisotropic vertex models of A_{(n_u)-1}-type, we build up a related
mixed vertex model by means of glueing the lattices on which they are defined,
in such a way that integrability property is preserved. Algebraically, the
glueing process is implemented through one dimensional representations of
rectangular matrix algebras A(R_p,R_q), namely, the `glueing matrices' zeta_u.
Here R_n indicates the Yang-Baxter operator associated to the standard Hopf
algebra deformation of the simple Lie algebra A_{n-1}. We show there exists a
pseudovacuum subspace with respect to which algebraic Bethe ansatz can be
applied. For each pseudovacuum vector we have a set of nested Bethe ansatz
equations identical to the ones corresponding to an A_{m-1} quasi-periodic
model, with m equal to the minimal range of involved glueing matrices.


title: Charged Higgs Boson Production in Bottom-Gluon Fusion

abstract:
  We compute the complete next-to-leading order SUSY-QCD corrections for the
associated production of a charged Higgs boson with a top quark via
bottom-gluon fusion. We investigate the applicability of the bottom parton
description in detail. The higher order corrections can be split into real and
virtual corrections for a general two Higgs doublet model and into additional
massive supersymmetric loop contributions. We find that the perturbative
behavior is well under control. The supersymmetric contributions consist of the
universal bottom Yukawa coupling corrections and non-factorizable diagrams.
Over most of the relevant supersymmetric parameter space the Yukawa coupling
corrections are sizeable, while the remaining supersymmetric loop contributions
are negligible.


title: Probing the Majorana mass scale of right-handed neutrinos in mSUGRA

abstract:
  We discuss the perspectives of testing the right-handed Majorana mass scale
M_R of the SUSY see-saw model in the mSUGRA framework. Lepton-flavor violating
low energy processes are analyzed in recently proposed post-LEP benchmark
scenarios, taking into account present uncertainties and future developments in
the neutrino sector. Nonobservation of mu -> e gamma in the next-generation PSI
experiment will provide upper bounds on M_R of the order of 10^(12-14) GeV,
while on the other hand, a positive signal for tau -> mu gamma at SUPERKEKB or
the LHC may determine M_R for a given mSUGRA scenario with an accuracy of a
factor of 2.


title: QCD Vacuum and Axions: What's Happening?

abstract:
  A deeper understanding of the vacuum structure in QCD invites one to rethink
certain aspects of the axion physics. The recent advances are mostly due to
developments in supersymmetric gauge theories and the brane theory, in which
QCD can be embedded. They include, but are not limited to, the studies of
metastable vacua in multicolor gluodynamics, and the domain walls. We briefly
review basics of the axion physics and then present a modern perspective on a
rich interplay between the QCD vacuum structure and axion physics.


title: QED radiative corrections to parity nonconservation in heavy atoms

abstract:
  The self-energy and vertex QED radiative corrections (Z alpha^2 f(Z alpha))
are shown to give a large negative contribution to the parity nonconserving
(PNC) amplitude in heavy atoms. The correction -0.7(2)% found for the 6s-7s PNC
amplitude in Cs brings the experimental result for this transition into
agreement with the standard model. The calculations are based on a new identity
that expresses the radiative corrections to the PNC matrix element via
corrections to the energy shifts induced by the finite nuclear size.


title: Chiral dynamics and B to 3 pi decay

abstract:
  I discuss our knowledge of the scalar sector of QCD and how it impacts the
determination of the CKM angle \alpha from the isospin analysis of B\to \rho\pi
decay.


title: The Polarized and Unpolarized Photon Content of the Nucleon

abstract:
  The equivalent photon content of polarized and unpolarized nucleons (protons,
neutrons), utilized in Weizs\"acker--Williams approximations, are presented.
For this purpose a new expression for the elastic photon component of a
polarized nucleon is derived. The inelastic photon components are obtained from
the corresponding momentum evolution equations subject to the boundary
conditions of their vanishing at some low momentum scale. The resulting photon
asymmetries, important for estimating cross section asymmetries in photon
induced subprocesses are also presented for some typical relevant momentum
scales.


title:
Zweig-rule-satisfying inelastic rescattering in B decays to pseudoscalar
  mesons

abstract:
  We discuss all contributions from Zweig-rule-satisfying SU(3)-symmetric
inelastic FSI-induced corrections in B decays to $\pi \pi$, $\pi K$,
$K\bar{K}$, $\pi \eta (\eta ')$, and $K \eta (\eta ')$ . It is shown how all of
these FSI corrections lead to a simple redefinition of the amplitudes,
permitting the use of a simple diagram-based description, in which, however,
weak phases may enter in a modified way. The inclusion of FSI corrections
admitted by the present data allows an arbitrary relative phase between the
penguin and tree short-distance amplitudes. The FSI-induced error of the
method, in which the value of the weak phase $\gamma $ is to be determined by
combining future results from $B^+,B^0_d,B^0_s$ decays to $K\pi$, is estimated
to be of the order of $5^o$ for $\gamma \approx 50^o-60^o$.


title:
SUSY effects on the exclusive semi-leptonic decays $B \to \pi \tau^+
  \tau^-$ and $B \to \rho \tau^+ \tau^-$

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


title: Two-photon cross-sections from the saturation model

abstract:
  A saturation model for the total gamma-gamma and gamma*-gamma* cross-sections
and for the real photon structure function F_2^gamma(x,Q^2) is described. The
model is based on a QCD dipole picture of high energy scattering. The
two-dipole cross-section is assumed to satisfy the saturation property with the
saturation radius taken from the GBW analysis of the gamma*-p interaction at
HERA. The model is combined with the QPM and non-pomeron reggeon contributions
an it gives a very good description of the data on the gamma-gamma total
cross-section, on the photon structure function F_2^gamma(x,Q^2) at low x and
on the gamma*-gamma* cross-section. Production of heavy quarks in gamma-gamma
collisions is also studied.


title: Saturation model for 2-gamma physics

abstract:
  We introduce a saturation model for photon-photon interactions, based on a
QCD dipole picture of high energy scattering. The two-dipole cross-section is
assumed to satisfy the saturation property. This pomeron-like contribution is
supplemented with QPM and non-pomeron reggeon contributions. The model gives a
very good description of the data on the gamma-gamma total cross-section, on
the photon structure function F_2^gamma(x,Q^2) at low x and on the
gamma*-gamma* cross-section.


title: Assisting pre-big bang phenomenology through short-lived axions

abstract:
  We present the results of a detailed study of how isocurvature axion
fluctuations are converted into adiabatic metric perturbations through axion
decay, and discuss the constraints on the parameters of pre-big bang cosmology
needed for consistency with present CMB-anisotropy data. The large-scale
normalization of temperature fluctuations has a non-trivial dependence both on
the mass and on the initial value of the axion. In the simplest, minimal models
of pre-big bang inflation, consistency with the COBE normalization requires a
slightly tilted (blue) spectrum, while a strictly scale-invariant spectrum
requires mild modifications of the minimal backgrounds at large curvature
and/or string coupling.


title:
Generalized parton distributions for weakly bound systems from
  light-front quantum mechanics

abstract:
  We present generalized parton distributions for weakly bound systems on the
light cone in order to build intuition about the light-front formalism. Physics
at the crossover is reviewed in terms of the light-cone Fock space
representation. Furthermore, we link light-cone Fock components to the equal
(light-cone) time projection of the covariant Bethe-Salpeter amplitude.
Continuity of the distributions arises naturally in this weak binding model.


title: Unitarity Triangles and the Search for New Physics

abstract:
  Assuming that the Kobayashi-Maskawa mechanism gives the dominant contribution
to CP violation at low energies, we propose a novel way of testing the flavour
sector of the Standard Model which has the potencial for discovering New
Physics. Using 3 x 3 unitarity of the V_{CKM} matrix and choosing a complete
set of rephasing invariant phases, we derive a set of exact relations in terms
of measurable quantities, namely moduli of V_{CKM} and arguments of rephasing
invariant quartets. These tests complement the usual analysis in the \rho, \eta
plane and, if there is New Physics, may reveal its source.


title: Racetrack models in theories from extra dimensions

abstract:
  We have investigated moduli stabilization leading to hierarchical
supersymmetry breakdown in racetrack models with two moduli fields
simultaneously present in the effective racetrack superpotential. We have shown
that stabilization of moduli occurs when a shift symmetry of the moduli space
becomes gauged. This gauging results in a D-term contribution to the scalar
potential that depends on moduli scalars. To break supersymmetry at a minimum
created this way in the case where only a single combination of moduli is
present in the superpotential one needs supergravity corrections. If the
superpotential depends on two independent combinations of moduli, supersymmetry
is broken by non-vanishing F-terms without supergravity terms. Some of the
minima that we see correspond to a non-vanishing expectation value of the
blowing-up modulus in the case of type IIB orientifold models. We point out
that the mass of the gauge boson associated with gauged shift symmetry becomes
naturally light in warped compactifications.


title:
Variation of the cross section for e+e- --> W+H- in the Minimal
  Supersymmetric Standard Model

abstract:
  We study the loop-induced process e+e- --> W+H- in the Minimal Supersymmetric
Standard Model (MSSM). This process allows the charged Higgs boson to be
produced in e+e- collisions when its mass is larger than half the
center-of-mass energy, so that e+e- --> H+H- is kinematically forbidden. By
scanning over the MSSM parameters subject to experimental constraints we
examine the range of values possible for this cross section. We find that, in
regions of parameter space where this cross section is large enough to be of
interest, the contributions from supersymmetric particles typically increase
the cross section by 50-100% compared to the non-supersymmetric two Higgs
doublet model result. Choosing a few typical MSSM parameter sets, we show the
regions in the m_{H^{\pm}}-tan(beta) plane in which at least 10 W^{\pm}H^{\mp}
events would be produced at the e+e- collider for m_{H^{\pm}} >= sqrt(s)/2. We
also show that including radiative corrections to the MSSM Higgs sector has
only a small effect on the cross section.


title:
Two-loop effective potential for the minimal supersymmetric standard
  model

abstract:
  I compute the complete two-loop effective potential for the minimal
supersymmetric standard model in the Landau gauge. This enables an accurate
determination of the minimization conditions for the vacuum expectation values
of the Higgs fields. Checks on the result follow from supersymmetric limits and
from renormalization-scale invariance. The renormalization group equations for
the field-independent vacuum energy and the vacuum expectation values are also
presented. I provide numerical examples showing the improved accuracy and scale
dependence obtained with the full two-loop effective potential.


title:
Constraining the absolute neutrino mass scale and Majorana CP violating
  phases by future neutrinoless double beta decay experiments

abstract:
  Assuming that neutrinos are Majorana particles, in a three generation
framework, current and future neutrino oscillation experiments can determine
six out of the nine parameters which fully describe the structure of the
neutrino mass matrix. We try to clarify the interplay among the remaining
parameters, the absolute neutrino mass scale and two CP violating Majorana
phases, and how they can be accessed by future neutrinoless double beta
($0\nu\beta\beta$) decay experiments, for the normal as well as for the
inverted order of the neutrino mass spectrum. Assuming the oscillation
parameters to be in the range presently allowed by atmospheric, solar, reactor
and accelerator neutrino experiments, we quantitatively estimate the bounds on
$m_0$, the lightest neutrino mass, that can be infered if the next generation
$0\nu\beta\beta$ decay experiments can probe the effective Majorana mass
($m_{ee}$) down to
  $\sim$ 1 meV. In this context we conclude that in the case neutrinos are
  Majorana particles: (a) if $m_0 \gsim 300$ meV, {\em i.e.}, within the range
directly attainable by future laboratory experiments as well as astrophysical
observations, then $m_{ee} \gsim 30$ meV must be observed;
  (b) if $m_0 < 300$ meV, results from future $0\nu\beta\beta$ decay
experiments combined with stringent bounds on the neutrino oscillation
parameters, specially the solar ones, will place much stronger limits on the
allowed values of $m_0$ than these direct experiments.


title:
Absence of shadowing in Drell-Yan production at finite transverse
  momentum exchange

abstract:
  Within a perturbative scalar QED model recently considered by Brodsky et al.,
we study how leading-twist Coulomb rescatterings affect the Drell-Yan cross
section at small x = x_{target}, and compare to the case of deep inelastic
scattering at small x_{B}. We show that in the range where the transverse
momentum transferred to the target is large compared to its minimal value $\sim
\morder{x}$, Coulomb rescatterings affect the DIS cross section but not the
Drell-Yan production rate. This illustrates that the leading-twist parton
distribution functions become non-universal when cross sections which are
differential in target-related particles are considered.


title: Correcting the Minimization Bias in Searches for Small Signals

abstract:
  We discuss a method for correcting the bias in the limits for small signals
if those limits were found based on cuts that were chosen by minimizing a
criterion such as sensitivity. Such a bias is commonly present when a
"minimization" and an "evaluation" are done at the same time. We propose to use
a variant of the bootstrap to adjust the limits. A Monte Carlo study shows that
these new limits have correct coverage.


title: Mass spectra of doubly heavy Omega_QQ' baryons

abstract:
  We evaluate the masses of baryons composed of two heavy quarks and a strange
quark with account for spin-dependent splittings in the framework of potential
model with the KKO potential motivated by QCD with a three-loop beta-function
for the effective charge consistent with both the perturbative limit at short
distances and linear confinement term at long distances between the quarks. The
factorization of dynamics is supposed and explored in the nonrelativistic
Schroedinger equation for the motion in the system of two heavy quarks
constituting the doubly heavy diquark and the strange quark interaction with
the diquark. The limits of approach, its justification and uncertainties are
discussed. Excited quasistable states are classified by the quantum numbers of
heavy diquark composed by the heavy quarks of the same flavor.


title:
The f_0(980) and a_0(980) Productions in Two-Photon Collisions and
  Radiative phi Meson Decays

abstract:
  We study how the scalar f_0(980) and a_0(980) states are produced in the
two-photon collisions and radiative decays of the phi meson through unitarized
Born amplitudes with the charged pion and kaon loops followed by S-wave
meson-meson scattering amplitudes. We found in a previous paper that f_0(980)
is generated as the bound state resonance, but a_0(980) as the cusp, and find
herre that the nature of the generation of both states is consistent with the
features of the production processes.


title: Consequences of symmetries in renormalizing collinear effective theory

abstract:
  We consider effects of symmetries on renormalization properties of the
collinear effective theory. We investigate which types of operators are
possible in the effective theory satisfying gauge invariance,
reparameterization invariance and residual energy invariance. Each symmetry
puts a constraint on the possible structure of the theory, and there can appear
only specific combinations of operators in the effective Lagrangian satisfying
all the symmetry requirements. And the final effective Lagrangian is not
renormalized to all orders in alpha_s as long as no other nonlocal operators
are induced at higher order. We explicitly prove this at one loop by
renormalizing one-gluon vertices and discuss their features.