title:
Next-to-next-to-leading-order soft-gluon corrections in direct photon
  production

abstract:
  Previous work on soft-gluon resummation for direct photon production is
extended to include additional subleading logarithmic terms through O(alpha
alpha_s^3) and some representative comparisons are made to experimental results
from the E-706 and UA-6 Collaborations. The additional terms are small in
magnitude, indicating good convergence properties to the level of accuracy
calculated. The scale dependence remains much smaller than that of the
next-to-leading-order calculation.


title: Quantum dynamics and thermalization for out-of-equilibrium phi^4-theory

abstract:
  The quantum time evolution of \phi^4-field theory for a spatially homogeneous
system in 2+1 space-time dimensions is investigated numerically for
out-of-equilibrium initial conditions on the basis of the Kadanoff-Baym
equations including the tadpole and sunset self-energies. Whereas the tadpole
self-energy yields a dynamical mass, the sunset self-energy is responsible for
dissipation and an equilibration of the system. In particular we address the
dynamics of the spectral (`off-shell') distributions of the excited quantum
modes and the different phases in the approach to equilibrium described by
Kubo-Martin-Schwinger relations for thermal equilibrium states. The
investigation explicitly demonstrates that the only translation invariant
solutions representing the stationary fixed points of the coupled equation of
motions are those of full thermal equilibrium. They agree with those extracted
from the time integration of the Kadanoff-Baym equations in the long time
limit. Furthermore, a detailed comparison of the full quantum dynamics to more
approximate and simple schemes like that of a standard kinetic (on-shell)
Boltzmann equation is performed. Our analysis shows that the consistent
inclusion of the dynamical spectral function has a significant impact on
relaxation phenomena. The different time scales, that are involved in the
dynamical quantum evolution towards a complete thermalized state, are discussed
in detail. We find that far off-shell 1 <-> 3 processes are responsible for
chemical equilibration, which is missed in the Boltzmann limit. Finally, we
address briefly the case of (bare) massless fields. For sufficiently large
couplings $\lambda$ we observe the onset of Bose condensation, where our scheme
within symmetric \phi^4-theory breaks down.


title: CP violation in $B \to \Phi K_S$ in a model III 2HDM

abstract:
  The mixing induced time dependent CP asymmetry, direct CP asymmetry, and
branching ratio in $B \to \Phi K_S$ in a model III 2HDM are calculated, in
particular, neutral Higgs boson contributions are included. It is shown that
satisfying all the relevant experimental constraints, for time dependent CP
asymmetry $S_{\phi K}$ the model III can agree with the present data, $S_{\phi
k}=-0.39\pm 0.41$, within the $1\sigma$ error, and the direct CP asymmetry
which is zero in SM can be about $ -8% \sim -20%$ in the reasonable regions of
parameters.


title: pp Elastic Scattering at LHC and Nucleon Structure (Conference Report)

abstract:
  High energy elastic pp differential cross section at LHC at the c.m. energy
14 TeV is predicted using the asymptotic behavior of sigma-tot(s) and rho(s),
and the measured pbar-p differential cross section at sqrt{s}=546 GeV. The
phenomenological investigation has progressively led to an effective field
theory model that describes the nucleon as a chiral bag embedded in a
quark-antiquark condensed ground state. The measurement of pp elastic
scattering at LHC up to large |t| >~ 10 GeV^2 by the TOTEM group will be
crucial to test this structure of the nucleon.


title: The MSSM with Non-Universal Higgs Masses

abstract:
  I review a generalization of CMSSM/mSUGRA model in which the Higgs masses are
let to be free, namely the Non Universal Higgs Masses (NUHM) model. In our
study we explore this model by employing constraints from cosmology as well as
from particle physics to restrict the parameter space. We also calculate the
neutralino-proton cross section in the allowed regions.


title: Some Comments on the Putative $\Theta^ +$ (1543) Exotic State

abstract:
  We point out that existing $K^+d$ scattering data available in the PDG
(Particle Data Group compilation) suggest some fluctuations in those momentum
bins where the (Fermi motion broadened) $\Theta^+$[1543] resonance recently
indicated in many gamma nuclear reactions and predicted six years ago by
Diakonv Petrov and Polyakov might have shown up. The I=0, $J^P={1/2}^+$ P-wave
channel should have a universal peak cross section of $\sim 37$ mb at
resonance. The smallness of the effect seen in $K^+d$ with the $\delta \sigma $
fluctuations being less than 4 mb imply an indirect bound $\Gamma_{\Theta^+} <
6$ MeV, far stronger than the direct gamma-d measurements. This renders the
theoretical interpretation of the new state very difficult.


title: Charm particle production in hadronic collisions

abstract:
  We study charm particle production in hadron-hadron collisions. After
calculating perturbatively the charm quark differential cross section, we study
the hadronization mechanisms. It is shown that recombination is the key to
understand the so called Leading Particle Effect in charm meson production. For
charm baryon production, however, leading particle effects are due to a
combination of contributions coming from both, the recombination and the
fragmentation mechanisms. We compare our calculations to experimental data on
charm hadron production in $\pi^- N$ and $p N$ interactions from several
experiments and show that a consistent description of them can be reached
without the aid of other mechanims than recombination and fragmentation.


title: Flavor Mixing and CP Violation of Massive Neutrinos

abstract:
  We present an overview of recent progress in the phenomenological study of
neutrino masses, lepton flavor mixing and CP violation. We concentrate on the
model-independent properties of massive neutrinos, both in vacuum and in
matter. Current experimental constraints on the neutrino mass spectrum and the
lepton flavor mixing parameters are summarized. The Dirac- and Majorana-like
phases of CP violation, which are associated respectively with the
long-baseline neutrino oscillations and the neutrinoless double beta decay, are
discussed in detail. The seesaw mechanism, the leptogenesis scenario and the
strategies to construct lepton mass matrices are briefly described. The
features of flavor mixing between one sterile neutrino and three active
neutrinos are also explored.


title: Neutrino Bi-Large Mixings and Family

abstract:
  After a brief review of quark-lepton relations in grand unified theories
(GUT), we show that the Pati-Salam relation with only one type of Higgs field
configuration with "four zero symmetric texture" can reproduce two large
neutrino mixings as well as observed mass differences. This is quite in
contrast to the case of SU(5) where bi-large mixings essentially come from the
charged lepton sector with non-symmetric charged lepton mass matrix.


title: Proposal for Generic Size of Large Extra Dimensions

abstract:
  In order to resolve the hierarchy problem, large extra dimensions have been
introduced, and it has been suggested that the size of extra dimensions is
sub-millimeter. On the other hand, we assume in this paper that the
cosmological constant comes from the Casimir energy of extra dimensions and
estimate the size of extra dimensions in terms of the value of the cosmological
constant discovered by the recent WMAP observations. We demonstrate that this
size is consistent with the one derived from the hierarchy problem and propose
that there may be a generic size of large extra dimensions when the number of
extra dimensions is equal to two.


title:
Singular Kahler Potential and Heavy Top Quark in A Democratic Mass
  Matrix Model

abstract:
  It is pointed out that heavy top quark mass can be attributed to a singular
normalization of its kinetic term, in which rescaling into canonical one yields
large top Yukawa coupling. We pursue this novel possibility in a democratic
mass matrix model where only the normalization of the third generation can be
different from that of the other two generations. With diagonal breaking of
democratic S_3 symmetry, we show that the singular normalization for the top
quark is essential to reproduce observed quark masses and mixing angles. We
also briefly argue other applications of this mechanism.


title: Quasi-coherent state of pions in the nucleon

abstract:
  Making use of the quasi-coherent state developed by Eriksson et al., we can
find a nucleon solution accompanied by the pion field with trivial topology. We
compare our approach with other related works, and examine a coherent state
description of pions in the baryon structure. Our solution suggests a kind of
nucleon resonance due to the topological change of pion field without the usual
quark excitation.


title:
Neutrino properties and the decay of the lightest supersymmetric
  particle

abstract:
  Supersymmetry with broken R-parity can explain the neutrino mass squared
differences and mixing angles observed in neutrino oscillation experiments. In
the minimal model, where R-parity is broken only by bilinear terms, certain
decay properties of the lightest supersymmetric particle (LSP) are correlated
with neutrino mixing angles. Here we consider charginos, squarks, gluinos and
sneutrinos being the LSP and calculate their decay properties in bilinear
R-parity breaking supersymmetry. Together with the decays of charged scalars
and neutralinos calculated previously this completes the proof that bilinear
R-parity breaking as the source of neutrino masses will be testable at future
colliders. Moreover, we argue that in case of GMSB, the decays of the NLSP can
be used to test the model.


title: Flavor Hierarchy from Extra Dimension and Gauge Threshold Correction

abstract:
  Dynamical quasi-localization of matter fields in extra dimension is an
elegant mechanism to generate hierarchical 4-dimensional Yukawa couplings. We
point out that a bulk matter field whose zero mode is quasi-localized can give
a large Kaluza-Klein threshold correction to low energy gauge couplings, which
is generically of the order of ln (Yukawa)/8pi^2, so it can significantly
affect gauge coupling unification. We compute such threshold corrections in
generic 5-dimensional theories compactified on S^1/Z_2 X Z_2, and apply the
result to grand unified theories on orbifold generating small Yukawa couplings
through quasi-localization.


title:
Cosmological dark energy from the cosmic QCD phase transition and colour
  entanglement

abstract:
  Recent astrophysical observations indicate that the universe is composed of a
large amount of dark energy (DE) responsible for an accelerated expansion of
the universe, along with a sizeable amount of cold dark matter (CDM),
responsible for structure formation. At present, the explanations for the
origin or the nature of both CDM and DE seem to require ideas beyond the
standard model of elementary particle interactions. Here, for the first time,
we show that CDM and DE can arise entirely from the standard principles of
strong interaction physics and quantum entanglement. Quantitative agreement
with the present data obtains without the need for any adjustable parameters.


title: Charming penguins in B => K* pi, K (rho,omega,phi) decays

abstract:
  We evaluate the decays B => K* pi, K (rho,omega,phi) adding the long distance
charming penguin contributions to the short distance: Tree+Penguin amplitudes.
We estimate the imaginary part of the charming penguin by an effective field
theory inspired by the Heavy Quark Effective Theory and parameterize its real
part. The final results for branching ratios depend on only two real parameters
and show a significant role of the charming penguins. The overall agreement
with the available experimental data is satisfactory.


title: Cosmological constraints from extra-dimension induced domain walls

abstract:
  TeV size extra dimensions introduce domain walls. Such walls are inconsistent
with CMB anisotropies. Either inflationary dynamics washes them out, or the
reheating temperature is lower then the temperature at which the walls start
forming networks. As the restoration of the symmetry is non-perturbative we
have performed 5d lattice simulations which show the occurrence of a cut-off in
the fifth dimension as well as symmetry restoration.


title:
Probing generalized parton distributions with electroproduction of
  lepton pairs off the nucleon

abstract:
  We evaluate the differential cross section for the electroproduction of
lepton pairs off a polarized nucleon target in the generalized Bjorken region
to leading power accuracy in hard momentum. We discuss the importance of this
process for phenomenology of generalized parton distributions. A special
attention is given to the sensitivity of physical observables, i.e., diverse
asymmetries, to their dependence on scaling variables that allows to map
directly the functional two-dimensional surface of generalized parton
distributions.


title: New Family of Exotic $\Theta$-Baryons

abstract:
  From the interpretation of the $\Theta^+$ baryon resonance as an excitation
of the ``skyrmion liquid'' with SU(3) flavor symmetry $\bar{10}$ we deduce a
new series of baryons, $\Theta_1^{++}$, $\Theta_1^{+}$ and $\Theta_1^0$,
situated at the top of the 27-plet of SU(3) flavor, with hypercharge Y=2,
isospin T=1 and spin $J=\frac32$. The mass of $\Theta_1$ is estimated 55
MeV/c^2 higher then the mass of $\Theta^+$ and its width at 80 MeV. We also
discuss the other baryons from the 27-plet.


title: Measuring 2beta+gamma with color-allowed B0 -> D+- Ks pi-+ decays

abstract:
  We present a method to measure the weak phase 2beta+gamma in the three-body
decay B0 -> D+- Ks pi-+. These decays are mediated by interfering amplitudes
which are color-allowed and hence relatively large. In addition, the three-body
decay helps to resolve discrete ambiguities present in measurements of the weak
phase. The experimental implications are discussed, and the sensitivity of the
method is evaluated using a simulation.


title: SUSY GUT Models of Neutrino Mass and mu to e gamma

abstract:
  It is explained why excessive mu to e gamma can be a problem in SUSY GUT
see-saw models of neutrino mass, and ways that this problem might be avoided
are discussed.


title:
Chaotic hybrid new inflation in supergravity with a running spectral
  index

abstract:
  We propose an inflation model in supergravity, in which chaotic and hybrid
inflation occurs successively, followed by new inflation. During hybrid
inflation, adiabatic fluctuations with a running spectral index with $\ns >1$
on a large scale and $\ns <1$ on a smaller scale are generated, as favored by
recent results of the first year Wilkinson Microwave Anisotropy Probe. The
initial condition of new inflation is also set dynamically during hybrid
inflation, and its duration and the amplitude of density fluctuations take
appropriate values to help early star formation to realize early reionization.


title:
Fits to data on polarised structure functions and spin asymmetries with
  power law corrections

abstract:
  We have compared polarized parton densities determined in the NLO QCD fits to
polarized structure functions and spin asymmetries. We consider models of such
distributions based on MRST 99 and MRST 2001 fits to non-polarized data. Simple
power law corrections corresponding to higher twists are taken into account and
their importance is analyzed. The role of positivity conditions for parton
densities and their influence on the values of $\chi^{2}$ is discussed.


title: Graviton Cosmology in Universal Extra Dimensions

abstract:
  In models of universal extra dimensions, gravity and all standard model
fields propagate in the extra dimensions. Previous studies of such models have
concentrated on the Kaluza-Klein (KK) partners of standard model particles.
Here we determine the properties of the KK gravitons and explore their
cosmological implications. We find the lifetimes of decays to KK gravitons, of
relevance for the viability of KK gravitons as dark matter. We then discuss the
primordial production of KK gravitons after reheating. The existence of a tower
of KK graviton states makes such production extremely efficient: for reheat
temperature T_RH and d extra dimensions, the energy density stored in gravitons
scales as T_RH^{2+3d/2}. Overclosure and Big Bang nucleosynthesis therefore
stringently constrain T_RH in all universal extra dimension scenarios. At the
same time, there is a window of reheat temperatures low enough to avoid these
constraints and high enough to generate the desired thermal relic density for
KK WIMP and superWIMP dark matter.


title:
Three-Loop Anomalous Dimension of the Heavy Quark Pair Production
  Current in Non-Relativistic QCD

abstract:
  The three-loop non-mixing contributions to the anomalous dimension of the
leading order quark pair production current in non-relativistic QCD are
computed. It is demonstrated that the renormalization procedure can only be
carried out consistently if the dynamics of both soft and the ultrasoft degrees
of freedom is present for all scales below the heavy quark mass, and if the
soft and ultrasoft renormalization scales are always correlated.


title:
CPsuperH: a Computational Tool for Higgs Phenomenology in the Minimal
  Supersymmetric Standard Model with Explicit CP Violation

abstract:
  We provide a detailed description of the Fortran code CPsuperH, a
newly--developed computational package that calculates the mass spectrum and
decay widths of the neutral and charged Higgs bosons in the Minimal
Supersymmetric Standard Model with explicit CP violation. The program is based
on recent renormalization-group-improved diagrammatic calculations that include
dominant higher--order logarithmic and threshold corrections, b-quark
Yukawa-coupling resummation effects and Higgs-boson pole-mass shifts. The code
CPsuperH is self--contained (with all subroutines included), is easy and fast
to run, and is organized to allow further theoretical developments to be easily
implemented. The fact that the masses and couplings of the charged and neutral
Higgs bosons are computed at a similar high-precision level makes it an
attractive tool for Tevatron, LHC and LC studies, also in the CP-conserving
case.


title: Applications of the heavy quark expansion: V_{ub} and spectral moments

abstract:
  The use of inclusive B decays to determine |V_{ub}|, |V_{cb}|, m_b and heavy
quark matrix elements via spectral moments is discussed.


title: Quintessence from Shape Moduli

abstract:
  We show that shape moduli in sub-millimeter extra dimensional scenarios,
addressing the gauge hierarchy problem, can dominate the energy density of the
universe today. In our scenario, the volume of the extra dimensions is
stabilized at a sufficiently high scale to avoid conflicts with nucleosynthesis
and solar-system precision gravity experiments, while the shape moduli remain
light but couple extremely weakly to brane-localized matter and easily avoid
these bounds. Nonlocal effects in the bulk of the extra dimension generate a
potential for the shape moduli. The potential has the right form and order of
magnitude to account for the present day cosmic acceleration, in a way
analogous to models of quintessence as a pseudo Nambu-Goldstone boson.


title: Quark-Lepton Quartification

abstract:
  We propose that quarks and leptons are interchangeable entities in the
high-energy limit. This naturally results in the extension of [SU(3)]^3
trinification to [SU(3)]^4 quartification. In addition to the unbroken color
SU(3)_q of quarks, there is now also a color SU(3)_l of leptons which reduces
to an unbroken SU(2)_l. We discuss the natural occurrence of SU(2)_l doublets
at the TeV energy scale, which leads remarkably to the unification of all gauge
couplings without supersymmetry. Proton decay occurs through the exchange of
scalar bosons, with a lifetime in the range 10^{34} - 10^{36} years.


title: Decay Probability Ratio of Pentaquark Theta^+ State

abstract:
  The pentaquark state of $\Theta^{+}(uudd\bar{s})$ has been observed to decay
with two decay modes: $\Theta^+\to n K^+$ and $\Theta^+ \to p K^0$. The decay
probability ratio of the two decay modes is studied with general symmetry
consideration of isospin, spin, and parity. We arrive at a result of the ratio
$\frac{\Gamma(\Theta^+\to nK^+)}{\Gamma(\Theta^+\to pK^0)}
=\frac{(\alpha-\beta)^2}{(\alpha+\beta)^2}(\frac{k_1}{k_2})^{2L+1}$, which is
valid for the $\Theta^+$ state to be a pure isoscalar or isovector state, or an
isoscalar and isovector mixing state, or an isotensor state with mixture of
isoscalar and isovector components with coefficients $\alpha$ and $\beta$. The
dependence on spin and parity of the pentaquark $\Theta^+$ state is found to be
small due to small difference between the center of mass decay momenta $k_1$
and $k_2$ of the two decay modes. We also provide an analysis on the constraint
of the isospin of $\Theta^+$ from the absence of a peak in the $pK^+$ invariant
mass distribution in the $\gamma p \to pK^+K^-$ process. Future experimental
results about the decay probability ratio may provide information about the
properties of the pentaquark $\Theta^+$ state.


title: Generalized Parton Distributions

abstract:
  We give an overview of the theory for generalized parton distributions.
Topics covered are their general properties and physical interpretation, the
possibility to explore the three-dimensional structure of hadrons at parton
level, their potential to unravel the spin structure of the nucleon, their role
in small-x physics, and efforts to model their dynamics. We review our
understanding of the reactions where generalized parton distributions occur, to
leading power accuracy and beyond, and present strategies for phenomenological
analysis. We emphasize the close connection between generalized parton
distributions and generalized distribution amplitudes, whose properties and
physics we also present. We finally discuss the use of these quantities for
describing soft contributions to exclusive processes at large energy and
momentum transfer.


title: Quark Imaging in the Proton Via Quantum Phase-Space Distributions

abstract:
  We develop the concept of quantum phase-space (Wigner) distributions for
quarks and gluons in the proton. To appreciate their physical content, we
analyze the contraints from special relativity on the interpretation of elastic
form factors, and examine the physics of the Feynman parton distributions in
the proton's rest frame. We relate the quark Wigner functions to the
transverse-momentum dependent parton distributions and generalized parton
distributions, emphasizing the physical role of the skewness parameter. We show
that the Wigner functions allow to visualize quantum quarks and gluons using
the language of the classical phase space. We present two examples of the quark
Wigner distributions and point out some model-independent features.


title: Heavy Quarkonium Production with Polarized Hadrons and Photons

abstract:
  We investigate the inclusive production of prompt J/psi mesons in polarized
hadron-hadron and photon-hadron collisions in the factorization formalism of
NRQCD. Numerical results are presented for BNL RHIC-Spin and the approved SLAC
fixed-target experiment E161 to assess the feasibility to access the
spin-dependent parton distributions in the polarized proton and photon. We
point out that data on J/psi production taken by the PHENIX Collaboration in
unpolarized proton-proton collisions at RHIC tend to favor the NRQCD
factorization hypothesis, while they significantly overshoot the theoretical
prediction of the CSM.


title: Neutrino Masses, Baryogenesis and Bilinear R-parity Violation

abstract:
  We consider the impact of cosmological $B-L$ constraints on supersymmetric
standard models with bilinear breaking of R-parity. In order to avoid erasing
any primordial baryon or lepton asymmetry above the electroweak scale, $B-L$
violation for at least one generation should be sufficiently small. Working in
the context of models with non--universal soft supersymmetry breaking masses,
we show how the above cosmological constraint can be satisfied while
simultaneously providing a neutrino mass matrix required by current data.


title:
chi_{c1} and chi_{c2} decay angular distributions at the Fermilab
  Tevatron

abstract:
  We consider the hadroproduction of chi_{c1} and chi_{c2} mesons and their
subsequent radiative decays to J/psi mesons and photons in the factorization
formalism of nonrelativistic quantum chromodynamics, and study the decay
angular distributions, by means of helicity density matrices, in view of their
sensitivity to color-octet processes. We present numerical results appropriate
for the Fermilab Tevatron.


title:
Leading Effects in Hadroproductions of Lambda_c and D From Constituent
  Quark-Diquark Cascade Picture

abstract:
  We discuss the hadroproductions of Lambda_c, Lambda_c bar, D and D bar in the
framework of the constituent quark-diquark cascade model taking into account
the valence quark annihilation. The spectra of Lambda_c and Lambda_c bar in pA,
Sigma^-A and pi^-A collisions are well explained by the model using the values
of parameters used in hadroproductions of D and D bar. It is shown that the
role of valence diquark in the incident baryon is important for D bar
productions as well as for Lambda_c production.


title:
Analytical calculation of Coulomb corrections to $e^+e^-$ pair
  production at intermediate photon energies

abstract:
  First correction to the high-energy asymptotics of the total $e^+e^-$
photoproduction cross section in the electric field of a heavy atom is obtained
with the exact account of this field. The consideration is based on the use of
the quasiclassical electron Green function in an external electric field. The
influence of screening on the Coulomb corrections is examined in the leading
approximation. It turns out that the high-energy asymptotics of the
corresponding correction is independent of the photon energy. The detailed
comparison of our results with experimental data is performed. This comparison
has justified the analytical result and allowed us to elaborate a simple ansatz
for the next-to-leading correction. Using this ansatz, good agreement with the
experimental data is obtained for photon energies above a few $MeV$. In the
region where both produced particles are relativistic, the corrections to the
high-energy asymptotics of the electron (positron) spectrum are obtained. In
addition, analogous corrections to the bremsstrahlung spectrum are derived
starting from the corresponding results for pair production.


title: Soft SUSY breaking and family symmetry

abstract:
  A spontaneously broken non-Abelian SU(3) family symmetry can generate a
realistic form for quark, charged lepton and neutrino masses and mixing angles.
It also gives a new solution to the SUSY flavour problem by ensuring near
family degeneracy of the soft mass SUSY breaking terms. However the need to
generate large third generation fermion masses means that the group must be
strongly broken to SU(2) giving significant corrections to the third family
squark and slepton masses. We investigate the phenomenological implications of
such breaking and show that it leads to new solutions capable of fitting all
present experimental measurements and bounds as well as the dark matter
abundance.


title:
Associated production of top squarks and charginos at the CERN LHC in
  NLO SUSY-QCD

abstract:
  We calculate the next-to-leading order inclusive total cross sections for the
associated production processes $pp\to \tilde{t}_i\tilde{\chi}_k^-+X$ in the
Minimal Supersymmetric Standard Model at the CERN LHC. Our results provide the
theoretical predictions for the total cross sections for the above processes.
The NLO QCD corrections in general enhance the leading order total cross
sections significantly, and vastly reduce the dependence of the total cross
sections on the renormalization/factorization scale, which leads to increased
confidence in predictions based on these results.


title:
Higgs decays in the Two Higgs Doublet Model: Large quantum effects in
  the decoupling regime

abstract:
  We study the Higgs-boson decays h0 -> b \bar{b}, h0 -> \gamma \gamma and h0
-> \gamma Z within the framework of the Two Higgs Doublet Model (THDM) in the
context of the decoupling regime, together with tree level unitarity
constraints. We show that when the light CP-even Higgs boson of the THDM mimics
the Standard-Model Higgs boson, not only the one-loop effects to h0 -> {\gamma
\gamma ,\gamma Z} but also the one-loop contribution to h0 -> b \bar{b} can be
used to distinguish between THDM and SM. The size of the quantum effects in h0
-> b \bar{b} are of the same order as in h0 -> {\gamma \gamma ,\gamma Z} and
can reach 25% in both cases.


title: Predictions of Physical Observables from Minimal Neutrino Structures

abstract:
  We find all possible seesaw textures which can describe in a natural way the
currently observed neutrino oscillation pattern in terms of a minimum number of
parameters. Natural here means due only to the relative smallness (vanishing)
of some parameters in the relevant lagrangian, without special relations or
accidental cancellations among them. The corresponding predictions for the
mixing angle theta_13 and the effective mass m_ee are given.


title:
Quasi-Degenerate Neutrinos and Lepton Flavour Violation in
  Supersymmetric Models

abstract:
  In supersymmetric (SUSY) models the misalignment between fermion and sfermion
families introduces unsuppressed flavor-changing processes. Even if the mass
parameters are chosen to give no flavor violation, family dependent radiative
corrections make this adjustment not stable. We analyze the rate of l --> l'
gamma in SUSY-GUT models with three quasi-degenerate neutrinos and universal
scalar masses at the Planck scale. We pay special attention to a recently
proposed scenario where the low-energy neutrino mixings are generated from
identical quark and lepton mixings at large scales. We show that: (i) To take
universal slepton masses at the GUT scale is a very poor approximation, even in
no-scale models. (ii) For large neutrino Yukawa couplings the decay mu --> e
gamma would be observed in the planned experiment at PSI. (iii) For large
values of tanbeta the tau coupling gives important corrections, pushing mu -->
e gamma and tau --> mu gamma to accessible rates. In particular, the
non-observation of these processes in the near future would exclude the
scenario with unification of quark and lepton mixing angles. (iv) The absence
of lepton flavor violating decays in upcoming experiments would imply a low
value of tanbeta, small neutrino couplings, and large (>~ 250$ GeV)
SUSY-breaking masses.


title: Scaling Rule for Nonperturbative Radiation in a Class of Event Shapes

abstract:
  We discuss nonperturbative radiation for a recently introduced class of
infrared safe event shape weights, which describe the narrow-jet limit.
Starting from next-to-leading logarithmic (NLL) resummation, we derive an
approximate scaling rule that relates the nonperturbative shape functions for
these weights to the shape function for the thrust. We argue that the scaling
reflects the boost invariance implicit in NLL resummation, and discuss its
limitations. In the absence of data analysis for the new event shapes, we
compare these predictions to the output of the event generator PYTHIA.


title: Charmless $B \to VP$ Decays Using Flavor SU(3) Symmetry

abstract:
  The decays of $B$ mesons to a charmless vector ($V$) and pseudoscalar ($P$)
meson are analyzed within a framework of flavor SU(3) in which symmetry
breaking is taken into account through ratios of decay constants in tree ($T$)
amplitudes. The magnitudes and relative phases of tree and penguin amplitudes
are extracted from data; the symmetry assumption is tested; and predictions are
made for rates and CP asymmetries in as-yet-unseen decay modes. A key
assumption for which we perform some tests and suggest others is a relation
between penguin amplitudes in which the spectator quark is incorporated into
either a pseudoscalar meson or a vector meson. Values of $\gamma$ slightly
restricting the range currently allowed by fits to other data are favored, but
outside this range there remain acceptable solutions which cannot be excluded
solely on the basis of present $B \to VP$ experiments.


title: Phenomenology of the Pentaquark Antidecuplet

abstract:
  We consider the mass splittings and strong decays of members of the
lowest-lying pentaquark multiplet, which we take to be a parity-odd
antidecuplet. We derive useful decompositions of the quark model wave functions
that allow for easy computation of color-flavor-spin matrix elements. We
compute mass splittings within the antidecuplet including spin-color and
spin-isospin interactions between constituents and point out the importance of
hidden strangeness in rendering the nucleon-like states heavier than the S=1
state. Using recent experimental data on a possible S=1 pentaquark state, we
make decay predictions for other members of the antidecuplet.


title: Test of Gauge-Yukawa Unification

abstract:
  Recently it has been proposed that, in the framework of quantum field theory,
both the Standard Model gauge and Yukawa interactions arise from a single gauge
interaction in higher dimensions with supersymmetry. This leads to the
unification of the Standard Model gauge couplings and the third family Yukawa
couplings at the GUT scale. In this work, we make a detailed study of this
unification using the current experimental data, and find a good agreement in a
significant region of the parameter space. Similar relations, required in
Finite Grand Unification models, are also studied.


title: Beautiful Mirrors, Unification of Couplings and Collider Phenomenology

abstract:
  The Standard Model provides an excellent description of the observables
measured at high energy lepton and hadron colliders. However, measurements of
the forward-backward asymmetry of the bottom quark at LEP suggest that the
effective coupling of the right-handed bottom quark to the neutral weak gauge
boson is significantly different from the value predicted by the Standard
Model. Such a large discrepancy may be the result of a mixing of the bottom
quark with heavy mirror fermions with masses of the order of the weak scale. To
be consistent with the precision electroweak data, the minimal extension of the
Standard Model requires the presence of vector-like pairs of SU(2) doublet and
singlet quarks. In this article, we show that such an extension of the Standard
Model is consistent with the unification of gauge couplings and leads to a very
rich phenomenology at the Tevatron, the B-factories and the LHC. In particular,
if the Higgs boson mass lies in the range 120 GeV $\simlt m_h \simlt 180$ GeV,
we show that Run II of the Tevatron collider with 4--8 fb$^{-1}$ of integrated
luminosity will have the potential to discover the heavy quarks, while
observing a 3-$\sigma$ evidence of the Higgs boson in most of the parameter
space. We also discuss the effects on the time dependent CP-asymmetry in $B \to
\phi K_s$ decays.


title:
Coherence length and nuclear shadowing for transverse and longitudinal
  photons

abstract:
  We study nuclear shadowing for transverse and longitudinal photons. The
coherence length, which controls the onset of nuclear shadowing at small
Bjorken-x is longer for longitudinal than for transverse photons. The
light-cone Green function technique properly treats the finite coherence length
in all multiple scattering terms. This is especially important in the region
x>0.01, where most of the data exist. NMC data on shadowing in deep inelastic
scattering are well reproduced in this approach. We also incorporate
nonperturbative effects, in order to extrapolate this approach to small photon
virtualities Q^2, where perturbative QCD cannot be applied. This way, we
achieve a description of shadowing that is based only on quark and gluon
degrees of freedom, even at low Q^2.


title:
Variations on KamLAND: likelihood analysis and frequentist confidence
  regions

abstract:
  In this letter the robustness of the first results from the KamLAND reactor
neutrino experiment with respect to variations in the statistical analysis is
considered. It is shown that an event-by-event based likelhood analysis
provides a more powerful tool to extract information from the currently
available data sample than a least-squares method based on energy binned data.
Furthermore, a frequentist analysis of KamLAND data is performed. Confidence
regions with correct coverage in the plane of the oscillation parameters are
calculated by means of a Monte Carlo simulation. I find that the results of the
usually adopted $\chi^2$-cut approximation are in reasonable agreement with the
exact confidence regions, however, quantitative differences are detected.
Finally, although the current data is consistent with an energy independent
flux suppression, a $\sim 2\sigma$ indication in favour of oscillations can be
stated, implying quantum mechanical interference over distances of the order of
200 km.


title:
The Sensitivity of a Lithium Experiment on Solar Neutrinos to the Mixing
  Angle theta_{12}

abstract:
  A lithium-based radiochemical detector is aimed primarily to detect neutrinos
from CNO cycle what will provide a direct proof of its existence and will be a
stringent test of the theory of stellar evolution. Another task which can be
solved by this experiment is to measure a mixing angle $\theta_{12}$. The
sensitivity of a lithium experiment to $\theta_{12}$ was calculated by
Monte-Carlo following the proposed original technique which can be used as a
complimentary one to a chi-square technique usually applied to this task. It is
shown that the accuracy of measurement of the mixing angle in solar neutrino
experiments is principally limited by the accuracy of a lithium experiment due
to the limiting uncertainty of the energy generated in a pp chain.


title: Impact of Subleading Corrections on Hadronic B Decays

abstract:
  We study the subleading corrections originating from the 3-parton (q\bar q g)
Fock states of final-state mesons in B decays. The corrections could give
significant contributions to decays involving an \omega or \eta^{(\prime)} in
the final states. Our results indicate the similarity of \omega K and \omega
\pi^- rates, of order 5\times 10^{-6}, consistent with the recent measurements.
We obtain a_2(B\to J/\psi K)\approx 0.27+0.05i, in good agreement with data.
Without resorting to the unknown singlet annihilation effects, 3-parton Fock
state contributions can enhance the branching ratios of K\eta' to the level
above 50\times 10^{-6}.


title:
Power counting in baryon chiral perturbation theory including vector
  mesons

abstract:
  It is demonstrated that using a suitable renormalization condition one
obtains a consistent power counting in manifestly Lorentz-invariant baryon
chiral perturbation theory including vector mesons as explicit degrees of
freedom.


title: mu problem in an extended gauge mediation supersymmetry breaking

abstract:
  We study the $\mu$ problem and the radiative electroweak symmetry breaking in
an extended gauge mediation supersymmetry breaking (GMSB) model, in which the
messenger fields are assumed to couple to the different singlet fields due to
the discrete symmetry. Since the spectrum of superpartners is modified, the
constraint from the $\mu$ problem can be relaxed in comparison with the
ordinary GMSB at least from the viewpoint of radiative symmetry breaking. We
study the consistency of the values of $\mu$ and $B_\mu$ with the radiative
electroweak symmetry breaking and also the mass spectrum of superpartners. We
present such a concrete example in a supersymmetric SU(5) unified model which
is constructed from a direct product gauge structure by imposing the
doublet-triplet splitting.


title: Extracting short-distance physics from K_{L,S} -> pi0 e+ e- decays

abstract:
  We present a new analysis of the rare decay K_L -> pi0 e+ e- taking into
account important experimental progress that has recently been achieved in
measuring K_L -> pi0 gamma gamma and K_S -> pi0 e+ e-. This includes a brief
review of the direct CP-violating component, a calculation of the indirect
CP-violating contribution, which is now possible after the measurement of K_S
-> pi0 e+ e-, and a re-analysis of the CP conserving part. The latter is shown
to be negligible, based on experimental input from K_L -> pi0 gamma gamma, a
more general treatment of the form factor entering the dispersive contribution,
and on a comparison with the CP violating rate, which can now be estimated
reliably. We predict B(K_L -> pi0 e+ e-) = (3.2 +1.2 -0.8) 10^{-11} in the
Standard Model, dominated by CP violation with a sizable contribution (~40%)
from the direct effect, largely through interference with the indirect one.
Methods to deal with the severe backgrounds for K_L -> pi0 e+ e- using
Dalitz-plot analysis and time-dependent K_L-K_S interference are also briefly
discussed.


title:
Observables in the Quantum Field Theory of neutrino mixing and
  oscillations

abstract:
  We report about recent results on the Quantum Field Theory of neutrino mixing
and oscillations. A discussion of the relevant observables for flavor fields is
given, leading to oscillation formulas which exhibit corrections with respect
to the usual ones.


title: Pion absorption and rescattering in the ANP model revisited

abstract:
  Single pion leptoproduction in the region of the (3,3) resonance is currently
of high interest for at least two reasons: (i) These reactions constitute an
important part of the total cross section in low energy reactions and are
utilized to detect neutrino oscillations in current and future long baseline
experiments. (ii) Intranuclear rescattering of the pions in heavy nuclei
results in interesting and sizable modifications of the free nucleon cross
sections which are testable in electroproduction experiments. In this article
we give a basic introduction to the pion multiple scattering model of Adler,
Nussinov, and Paschos (ANP) with special emphasis on pion absorption. We also
estimate the probability of multiple scattering.


title:
Transverse Momentum Fluctuations from Clustering and Percolation of
  Strings

abstract:
  Transverse momentum fluctuations can be understood as resulting from
clustering of strings or partons. Data allows to distinguish clustering without
percolation, from clustering with percolation. Percolation is clearly favored
by data.


title:
Supersymmetric electroweak corrections to t bar{t} h associated
  production at e+e- colliders

abstract:
  The electroweak corrections of order ${\cal O}(\alpha_{\rm em}
m^2_{t,b}/m^2_w)$ and ${\cal O}(\alpha_{\rm em} m^3_{t,b}/m^3_w)$ to Higgs
boson associated production with top quark pair are calculated at $e^+e^-$
colliders in the standard model (SM), the two-Higgs-doublet model (2HDM) and
the minimal supersymmetric standard model (MSSM). These corrections are a few
percent in general, and in the MSSM they can be over ten percent for favorable
parameter values allowing by current precise experiments. The total cross
sections including the electroweak corrections get their maximal near $\sqrt{s}
= 700$GeV, and can reach 2.8 fb, 2.7 fb and 2.5 fb in the SM, the 2HDM and the
MSSM, respectively.


title: Worries and Hopes for SUSY in CKM Physics: The b to s Example

abstract:
  We discuss the twofold role of flavor and CP violation as a constraint in
model building and as a signal of SUSY. Considering as an example b to s
transitions, we analyze present bounds on SUSY parameters, discuss possible
deviations from SM predictions in Bd and Bs physics and present strategies to
reveal SUSY signals in present and future experiments in the CKM domain.


title: ee4fgamma, A program for e+e- -> 4f, 4fgamma with nonzero fermion masses

abstract:
  A computer program ee4fgamma for calculating cross sections of any four
fermion final state of e+e--annihilation at high energy and the corresponding
bremsstrahlung reaction that is possible in the framework of the Standard Model
is presented. As the fermion masses are arbitrary, the cross sections can be
computed without any collinear cut, the on-shell top quark production can be
studied and the Higgs boson exchange can be incorporated in a consistent way.
The program can be used as a Monte Carlo generator of unweighted events as
well.


title: Curvaton Dynamics

abstract:
  In contrast to the inflaton's case, the curvature perturbations due to the
curvaton field depend strongly on the evolution of the curvaton before its
decay. We study in detail the dynamics of the curvaton evolution during and
after inflation. We consider that the flatness of the curvaton potential may be
affected by supergravity corrections, which introduce an effective mass
proportional to the Hubble parameter. We also consider that the curvaton
potential may be dominated by a quartic or by a non-renormalizable term. We
find analytic solutions for the curvaton's evolution for all these
possibilities. In particular, we show that, in all the above cases, the
curvaton's density ratio with respect to the background density of the Universe
decreases. Therefore, it is necessary that the curvaton decays only after its
potential becomes dominated by the quadratic term, which results in (Hubble
damped) sinusoidal oscillations. In the case when a non-renormalizable term
dominates the potential, we find a possible non-oscillatory attractor solution
that threatens to erase the curvature perturbation spectrum. Finally, we study
the effects of thermal corrections to the curvaton's potential and show that,
if they ever dominate the effective mass, they lead to premature thermalization
of the curvaton condensate. To avoid this danger, a stringent bound has to be
imposed on the coupling of the curvaton to the thermal bath.


title:
Relativistic corrections to gluon fragmentation into spin-triplet S-wave
  quarkonium

abstract:
  We use the NRQCD factorization formalism to calculate the relativistic
corrections to the fragmentation function for a gluon fragmenting into a
spin-triplet S-wave heavy quarkonium. We make use of the gauge-invariant
formulation of the fragmentation function of Collins and Soper. The color-octet
contribution receives a large, negative relativistic correction, while the
color-singlet contribution receives a large, positive relativistic correction.
The considerable decrease in the color-octet contribution requires a
corresponding increase in the phenomenological value of the leading color-octet
matrix element in order to maintain a fit to the Fermilab Tevatron data.


title: Neutrinos under Strong Magnetic Fields

abstract:
  In this talk we review the results on neutrino propagation under external
magnetic fields. We concentrate on the effects of strong magnetic fields
$M_{W}^{2}\gg B\gg m_{e}^{2}$ in neutral media. It is shown that the neutrino
energy density get a magnetic contribution in the strong-field, one-loop
approximation, which is linear in the Fermi coupling constant as in the charged
medium. It is analyzed how this correction produces a significant oscillation
resonance between electron-neutrinos and the other two active flavors, as well
as with sterile neutrinos. The found resonant level-crossing condition is
highly anisotropic. Possible cosmological applications are discussed. Effects
due to primordial hypermagnetic fields on neutrinos propagating in the
symmetric phase of the electroweak model are also presented. At sufficiently
strong hypermagnetic fields, $B\geq T^{2}$, the neutrino energy is found to be
similar to that of a massless charged particle with one-degree of freedom.


title: Delta-to-N-gamma Coulomb Quadrupole Amplitude in PQCD

abstract:
  We present a leading-order pQCD calculation of the helicity-flip $\Delta\to
N\gamma^*$ matrix element $G_0$ (Coulomb quadrupole amplitude $C2$), taking
into account the transverse momenta of the quarks and the contribution from the
gluons. In the large $Q^2$ limit, its scaling behavior acquires a
double-logarithmic correction $\log^2{(Q^2/\Lambda^2)}$ compared with the
standard scaling analysis, due to the contribution from the orbital motion of
the small-$x$ partons. Based on this and on the latest JLab experimental
results of the $C2-M1$ ratio $R_{SM}$ at $Q^2$ = 3 $\sim$ 4 GeV$^2$, we make a
phenomenological prediction for the latter at higher values of $Q^2$.


title: Rescattering Effects on DIS Parton Distributions

abstract:
  Rescattering of the struck quark in Deep Inelastic Scattering implies that
measured parton distributions are not directly related to the Fock state
probabilities of the target wave function. The production amplitudes acquire
dynamical phases, which gives rise to shadowing and diffraction in DIS.


title: CMB constraints on non-thermal leptogenesis

abstract:
  Leptogenesis is at the heart of particle cosmology which requires physics
beyond the Standard Model. There are two possibilities of realizing
leptogenesis; thermal and non-thermal. Both are viable given the scale of
inflation and the constraint on the reheat temperature. However non-thermal
leptogenesis can leave its imprint upon cosmic micro wave background radiation.
In this paper we will discuss cosmological constraints on non-thermal
leptogenesis scenarios within supersymmetry.


title:
Higgs-mediated muon-electron conversion process in supersymmetric seesaw
  model

abstract:
  We study the effect of the Higgs-exchange diagram for the lepton flavor
violating muon-electron conversion process in nuclei in the supersymmetric
seesaw model. The contribution is significant for a large value of tan beta and
a small value of a neutral heavy Higgs boson mass, in which case the ratio of
the branching ratios of B(mu N -> e N) / B(mu -> e gamma) is enhanced. We also
show that the target atom dependence of the conversion branching ratio provides
information on the size of the Higgs exchange diagram.


title: Dynamical origin of low-mass fermions in Randall-Sundrum background

abstract:
  We investigate a dynamical mechanism to generate fermion mass in the
Randall-Sundrum background. We consider four-fermion interaction models where
the fermion field propagates in an extra-dimension, i.e. the bulk four-fermion
interaction model. It is assumed that two types of fermions with opposite
parity exist in the bulk. We show that electroweak-scale mass is dynamically
generated for a specific fermion anti-fermion condensation, even if all the
scale parameters in the Lagrangian are set to the Planck scale.


title: Chiral quark model with relativistic kinematics

abstract:
  The non-strange baryon spectrum is studied within a three-body model that
incorporates relativistic kinematics. We found that the combined effect of
relativistic kinematics together with the pion exchange between quarks is able
to reverse the order of the first positive- and negative-parity nucleon excited
states as observed experimentally. Including the chiral partner of the pion
(the $\sigma$ meson) leads to an overall good description of the spectrum.


title: A QCD Axion from Higher Dimensional Gauge Field

abstract:
  We point out that a QCD axion solving the strong CP problem can arise
naturally from parity-odd gauge field C_M in 5-dimensional (5D) orbifold field
theory. The required axion coupling to the QCD anomaly comes from the 5D
Chern-Simons coupling, and all other unwanted U(1)_{PQ} breaking axion
couplings can be avoided naturally by the 5D gauge symmetry of C_M and the 5D
locality. If the fifth dimension is warped, the resulting axion scale is
suppressed by small warp factor compared to the Planck scale, thereby the model
can generate naturally an intermediate axion scale f_a=10^{10} - 10^{12}GeV.


title: Top Quark production dynamics

abstract:
  I discuss various aspects of the dynamics of top quark production both via
the strong interaction (pair production) and via the charged current weak
interaction (single top production).


title:
Heavy-quark condensate at zero- and nonzero temperatures for various
  forms of the short-distance potential

abstract:
  With the use of the world-line formalism, the heavy-quark condensate in the
SU(N)-QCD is evaluated for the cases when the next-to-1/r term in the
quark-antiquark potential at short distances is either quadratic, or linear. In
the former case, the standard QCD-sum-rules result is reproduced, while the
latter result is a novel one. Explicitly, it is UV-finite only in less than
four dimensions. This fact excludes a possibility to have, in four dimensions,
very short strings (whose length has the scale of the lattice spacing), and
consequently the short-range linear potential (if it exists) cannot violate the
OPE. In any number of dimensions, the obtained novel expression for the quark
condensate depends on the string tension at short distances, rather than on the
gluon condensate, and grows linearly with the number of colors in the same way
as the standard QCD-sum-rules expression. The use of the world-line formalism
enables one to generalize further both results to the case of finite
temperatures. A generalization of the QCD-sum-rules expression to the case of
an arbitrary number of space-time dimensions is also obtained and is shown to
be UV-finite, provided this number is smaller than six.


title: Unitarity at the LHC energies

abstract:
  Phenomena related to the non-perturbative aspects of strong interactions at
the LHC are discussed with emphasis on elastic and inelastic soft and hard
diffraction processes. Predictions for the global characteristics and angular
distributions in proton-proton collisions with elastic and multiparticle final
states are given. Potential for discovery of the novel effects related to the
increasing role of the elastic scattering at the LHC energies and its physical
implications in diffractive and multiparticle production processes are
reviewed.


title: Super-heavy X particle decay and Ultra-High Energy Cosmic Rays

abstract:
  In this thesis, I describe in great detail the physics of the decay of any
Super-Heavy X particle (with masses up to the grand unification scale ~ 10^16
GeV and possibly beyond), and the computer code I developed to model this
process - which currently is the most complete available one. The general
framework for this work is the Minimal Supersymmetric Standard Model (MSSM).
The results are presented in the form of fragmentation functions of any
(s)particle of the MSSM into any final stable particle (proton, photon,
electron, three types of neutrino, lightest superparticle LSP) at a virtuality
Q = M_X, over a scaled energy range x = 2E/M_X in [10^{-13}, 1]. At very low x
values, color coherence effects have been taken into account through the
Modified Leading Log Approximation (MLLA). The whole process is explicitely
shown to conserve energy with a numerical accuracy up to a few part per mille,
which allows to make quantitative predictions for any N-body decay mode of any
X particle. I then apply the results to the old - and yet unsolved - problem of
Ultra High Energy Cosmic Rays (UHECRs). In particular, I provide quantitative
predictions of generic ``top-down'' models for the neutrino and neutralino
fluxes which could be observed in the next generation of detectors.


title:
Lifetime Differences and CP Violation Parameters of Neutral B Mesons at
  the Next-to-Leading Order in QCD

abstract:
  We compute the next-to-leading order QCD corrections to the off-diagonal
elements of the decay-width matrix Gamma entering the neutral B-meson
oscillations. From this calculation the width differences DeltaGamma and the CP
violation parameters (q/p) of Bd and Bs mesons are estimated, including the
complete O}(alpha_s) QCD corrections and the 1/mb contributions. For the width
difference DeltaGamma_s we agree with previous results. By using the lattice
determinations of the relevant hadronic matrix elements we obtain the
theoretical predictions DeltaGamma_d/Gamma_d=(2.42+-0.59) x 10^(-3) and
DeltaGamma_s/Gamma_s=(7.4+-2.4) x 10^(-2). For the CP violation parameters, we
find |(q/p)_d|-1=(2.96+-0.67) x 10^(-4) and |(q/p)_s|-1=(-1.28+-0.27) x
10^(-5). These predictions are compatible with the experimental measurements
which, however, suffer at present from large uncertainties.


title: W-boson unitarity effects and oscillations in the neutral Kaon system

abstract:
  We study the effects on oscillations in the neutral-Kaon system from lepton
and hadron self-energy loops in the W-boson propagators. The corresponding W
box diagrams are evaluated by attaching the external quark lines to covariant
vertex functions for the composite Kaons, integrating over all off-shell
momenta. We find that the ratio of the imaginary and real parts of the
amplitude is of the same size as with the experimental value of the modulus of
the CP-violating parameter epsilon.


title: Soft Leptogenesis

abstract:
  We study ``soft leptogenesis'', a new mechanism of leptogenesis which does
not require flavour mixing among the right-handed neutrinos. Supersymmetry
soft-breaking terms give a small mass splitting between the CP-even and CP-odd
right-handed sneutrino states of a single generation and provide a CP-violating
phase sufficient to generate a lepton asymmetry. The mechanism is successful if
the lepton-violating soft bilinear coupling is unconventionally (but not
unnaturally) small. The values of the right-handed neutrino masses predicted by
soft leptogenesis can be low enough to evade the cosmological gravitino
problem.


title:
Effects of the scalar FCNC in $b\to sl^+l^-$ transitions and
  supersymmetry

abstract:
  We investigate the potential effects of the scalar flavour changing neutral
currents that are generated e.g. in supersymmetry with $\tan\beta\gg1$ in the
$b\to sl^+l^-$ transitions. Using the experimental upper limit on
$BR(B^0_s\to\mu^+\mu^-)$ we place stringent model independent constraints on
the impact these currents may have on the rates $BR(B\to X_s\mu^+\mu^-)$ and
$BR(B\to K\mu^+\mu^-)$. We find that in the first case, contrary to the claim
made recently in the literature, the maximal potential effects are always
smaller than the uncertainty of the Standard Model NNLO prediction, that is of
order 5-15%. In the second case, the effects can be large but the experimental
errors combined with the unsettled problems associated with the relevant
formfactors do not allow for any firm conclusion about the detectability of a
new physics signal in this process. In supersymmetry the effects of the scalar
flavour changing neutral currents are further constrained by the experimental
lower limit on the $B^0_s$-$\bar B^0_s$ mass difference, so that most likely no
detectable signal of the supersymmetry generated scalar flavour changing
neutral currents in processes $B\to X_s\mu^+\mu^-$ and $B\to K\mu^+\mu^-$ is
possible.


title: TeV Physics from the Top Down

abstract:
  Concrete semi-realistic string/M theory constructions often predict the
existence of new physics at the TeV scale, which may be different in character
from the bottom-up ideas that are motivated by specific problems of the
standard model. I describe two examples, heterotic and open string, of such
constructions. The latter has a particularly interesting strongly-coupled
quasi-hidden sector, which may lead to composite states at low energy and
dynamical supersymmetry breaking. General issues, such as grand unification
versus direct compactification, additional U(1)' gauge symmetries and other
exotics, and flat directions are discussed.


title: Neutrino Masses, Mixing and Neutrinoless Double-Beta Decay

abstract:
  The predictions for the effective Majorana mass |<m>| in neutrinoless
double-beta decay in the case of 3-neutrino mixing and massive Majorana
neutrinos are reviewed. The physics potential of the experiments, searching for
neutrinoless double-beta decay and having sensitivity to $|<m>| \gtap 0.01$ eV,
for providing information on the type of the neutrino mass spectrum, on the
absolute scale of neutrino masses and on the Majorana CP-violation phases in
the PMNS neutrino mixing matrix is also discussed.


title: Sugra Dark Matter

abstract:
  I review the phenomenological and cosmological constraints on the parameter
space associated with the Constrained Minimal Supersymmetric Standard Model
(CMSSM). The effect of the recent WMAP determination of the cold dark matter
density will be discussed. A very constrained model (based on minimal
supergravity relations between the bi- and tri-linear supersymmetry breaking
mass terms) will be outlined.


title: RS1, Custodial Isospin and Precision Tests

abstract:
  We study precision electroweak constraints within a RS1 model with gauge
fields and fermions in the bulk. The electroweak gauge symmetry is enhanced to
SU(2)_L \times SU(2)_R \times U(1)_{B-L}, thereby providing a custodial isospin
symmetry sufficient to suppress excessive contributions to the T parameter. We
then construct complete models, complying with all electroweak constraints, for
solving the hierarchy problem, without supersymmetry or large hierarchies in
the fundamental couplings. Using the AdS/CFT correspondence our models can be
interpreted as dual to a strongly coupled conformal Higgs sector with global
custodial symmetry, gauge and fermionic matter being fundamental fields
external to the CFT. This scenario has interesting collider signals, distinct
from other RS models in the literature.


title: Stabilizing the invisible axion in 3-3-1 models

abstract:
  By introducing local $Z_N$ symmetries with $N=11,13$ in two 3-3-1 models, it
is possible to implement an automatic Peccei-Quinn symmetry, keeping the axion
protected against gravitational effects at the same time. Both models have a
$Z_2$ domain wall problem and the neutrinos are strictly Dirac particles.


title: Towards a Realistic Model of Higgsless Electroweak Symmetry Breaking

abstract:
  We present a 5D gauge theory in warped space based on a bulk SU(2)_L x
SU(2)_R x U(1)_(B-L) gauge group where the gauge symmetry is broken by boundary
conditions. The symmetry breaking pattern and the mass spectrum resembles that
in the standard model (SM). To leading order in the warp factor the rho
parameter and the coupling of the Z (or equivalently the S-parameter) are as in
the SM, while corrections are expected at the level of a percent. From the
AdS/CFT point of view the model presented here can be viewed as the AdS dual of
a (walking) technicolor-like theory, in the sense that it is the presence of
the IR brane itself that breaks electroweak symmetry, and not a localized Higgs
on the IR brane (which should be interpreted as a composite Higgs model). This
model predicts the lightest W, Z and photon resonances to be at around 1.2 TeV,
and no fundamental (or composite) Higgs particles.


title: QCD factorization for B->PP and B->PV decays

abstract:
  A comprehensive study of exclusive hadronic B-meson decays into final states
containing two pseudoscalar mesons (PP) or a pseudoscalar and a vector meson
(PV) is presented. The decay amplitudes are calculated at leading power in
Lambda_{QCD}/m_b and at next-to-leading order in alpha_s using the QCD
factorization approach. The calculation of the relevant hard-scattering kernels
is completed. Important classes of power corrections, including
``chirally-enhanced'' terms and weak annihilation contributions, are estimated
and included in the phenomenological analysis. Predictions are presented for
the branching ratios of the complete set of the 96 decays of B^-, B^0, and B_s
mesons into PP and PV final states, and for most of the corresponding CP
asymmetries. Several decays and observables of particular phenomenological
interest are discussed in detail, including the magnitudes of the penguin
amplitudes in PP and PV final states, an analysis of the pi-rho system, and the
time-dependent CP asymmetry in the K phi and K eta' final states.


title:
Estimate of SU(3) flavour symmetry breaking in B_s -> K^+ K^- vs. B_d ->
  pi^+\pi^- decay

abstract:
  I estimate the SU(3) flavour symmetry breaking in the ratio of
penguin-to-tree ratios of the decays B_s\to K^+ K^- and B_d\to\pi^+\pi^-, given
an assumption on the flavour symmetry breaking of the hadronic input
parameters. The decay amplitudes are calculated in QCD factorization.
Implications for the determination of gamma are discussed.


title: Measuring psi(3770) --> rho pi in e+e- experiment

abstract:
  In S- and D-wave mixing scheme, the branching ratio of psi(3770) --> rho pi
is estimated. Together with the continuum cross section of rho pi estimated by
form factor, the observed cross section of rho pi production at psi(3770) in
e+e- experiment is calculated taking into account the interference effect
between the resonance and continuum amplitudes and the initial state radiative
correction. The behavior of the cross section reveals that the disappearance of
rho pi signal just indicates the existence of the corresponding branching ratio
B(psi(3770) --> rho pi) at the order of 10 to the minus fourth.


title: Tracing very high energy neutrinos from cosmological distances in ice

abstract:
  Astrophysical sources of ultrahigh energy neutrinos yield tau neutrino fluxes
due to neutrino oscillations. We study in detail the contribution of tau
neutrinos with energies above PeV relative to the contribution of the other
flavors. We consider several different initial neutrino fluxes and include tau
neutrino regeneration in transit through the Earth and energy loss of charged
leptons. We discuss signals of tau neutrinos in detectors such as IceCube, RICE
and ANITA.


title: Democratic Mass Matrices From Five Dimensions

abstract:
  We reconstruct the Standard Model (SM) quark masses and the
Cabibbo-Kobayashi-Maskawa (CKM) matrix from a five-dimensional model, with the
fifth dimension compactified on an S^1/Z_2 orbifold. Fermions are localized
only at the orbifold fixed points and the induced quark mass matrices are
almost democratic. Two specific versions of our model with 15 and 24 parameters
are presented, and for both versions we can reproduce the quark mass spectrum
and CKM matrix correctly to the level they are observed in current experiments.


title: Calibration processes for photon-photon colliders

abstract:
  Processes with creation of a pair charged particles with emission of hard
photon and two pairs of charged particles are considered for colliding
partially polarized photon photon beams. The effects of circular and linear
polarization of the initial photons are discussed in more details.


title:
The lowest order inelastic QED processes at polarized photon-electron
  high energy collisions

abstract:
  The compact expressions for cross sections of photoproduction of a pair of
charged particles $\mathrm{e}^+,\mathrm{e}^-$; $\mu^+,\mu^-$; $\pi^+,\pi^-$ as
well as the double Compton scattering process are given. The explicit analytic
expressions for the case of polarized photon and the initial electron in the
kinematics when all the particles can be considered as a massless ones are
presented. The photon polarization is described in the terms of Stokes
parameters.


title:
Large Transverse Momenta in Statistical Models of High Energy
  Interactions

abstract:
  The creation of particles with large transverse momenta in high energy
hadronic collisions is a long standing problem. The transition from small-
(soft) to hard- parton scattering `high-pt' events is rather smooth. In this
paper we apply the non-extensive statistical framework to calculate transverse
momentum distributions of long lived hadrons created at energies from low
(sqrt(s)~10 GeV) to the highest energies available in collider experiments
(sqrt(s)~2000 GeV). Satisfactory agreement with the experimental data is
achieved. The systematic increase of the non-extensivity parameter with energy
found can be understood as phenomenological evidence for the increased role of
long range correlations in the hadronization process.
  Predictions concerning the rise of average transverse momenta up to the
highest cosmic ray energies are also given and discussed.


title: Phenomenological Aspects of Heterotic Orbifold Models at One Loop

abstract:
  We provide a detailed study of the phenomenology of orbifold
compactifications of the heterotic string within the context of supergravity
effective theories. Our investigation focuses on those models where the soft
Lagrangian is dominated by loop contributions to the various soft supersymmetry
breaking parameters. Such models typically predict non-universal soft masses
and are thus significantly different from minimal supergravity and other
universal models. We consider the pattern of masses that are governed by these
soft terms and investigate the implications of certain indirect constraints on
supersymmetric models, such as flavor-changing neutral currents, the anomalous
magnetic moment of the muon and the density of thermal relic neutralinos. These
string-motivated models show novel behavior that interpolates between the
phenomenology of unified supergravity models and models dominated by the
superconformal anomaly.


title:
Spectral Index of Curvaton Perturbations in Flat Potential Inflation
  Models

abstract:
  This paper has been withdrawn. Comments regarding D-term inflation will be
incorporated in a forthcoming article.


title:
Group Theoretical Analysis of Light-Cone Dominated Hadronic Processes
  and Twist Decomposition of Nonlocal Operators in Quantum Chromodynamics

abstract:
  In the framework of nonlocal light-cone expansion of two current operators we
construct bilocal as well as trilocal QCD light-cone operators with definite
geometric twist. We are able to decompose uniquely the appearing QCD light-cone
operators into all their twist parts on the light-cone.
  The quark distribution functions and the vector meson distribution amplitudes
which are defined as forward and skewed nucleonic matrix elements of nonlocal
light-cone operators are classified with respect to geometric twist. Hereby we
found well-kown and new Wandzura-Wilczek type relations between the quark
distribution functions with dynamical twist and, additionally, between the
vector meson distribution amplitudes with dynamical twist.
  Using group theoretical methods we are able to construct all bilocal off-cone
QCD operators with twist 2 and 3. Additionally, we calculate their nucleonic
matrix elements (double distribution functions, scalar and vector meson
distribution amplitudes). In some special cases we give also the twist
decomposition of off-cone QCD operators from minimal up to infinite twist.


title:
Nuclear Structure Functions at Small x from Inelastic Shadowing and
  Diffraction

abstract:
  A model for shadowing in nuclear structure functions at small $x$ and small
or moderate $Q^2$ is presented using the relation with diffraction that arises
from Gribov's reggeon calculus. A reasonable description of the experimental
data is obtained with no fitted parameters. A comparison with predictions from
other models is performed.


title: Large Extra Dimensions and Decaying KK Recurrences

abstract:
  We suggest the possibility that in ADD type brane-world scenarios, the higher
KK excitations of the graviton may decay to lower ones owing to a breakdown of
the conservation of extra dimensional ``momenta'' and study its implications
for astrophysics and cosmology. We give an explicit realization of this idea
with a bulk scalar field $\Phi$, whose nonzero KK modes acquire vacuum
expectation values. This scenario helps to avoid constraints on large extra
dimensions that come from gamma ray flux bounds in the direction of nearby
supernovae as well as those coming from diffuse cosmological gamma ray
background. It also relaxes the very stringent limits on reheat temperature of
the universe in ADD models.


title: Gauge Coupling Unification and Neutrino Masses in 5D SUSY SO(10)

abstract:
  In this talk I discuss the problems and virtues of SUSY GUTs in four
dimensions. I then show how to solve some of these problems, without foregoing
the virtues, by considering an SO(10) SUSY GUT in five dimensions. I discuss
gauge coupling unification and neutrino masses. In particular, it is shown that
the 5D compactification scale and cutoff scale are determined by fitting the
low energy values of the three standard model gauge couplings. Neutrino masses
can be accommodated.


title: Invisible Z-Boson Decays at e+e- Colliders

abstract:
  The measurement of the invisible Z-boson decay width at e+e- colliders can be
done "indirectly", by subtracting the Z-boson visible partial widths from the
Z-boson total width, or "directly", from the process e+e- -> \gamma \nu
\bar{\nu}. Both procedures are sensitive to different types of new physics and
provide information about the couplings of the neutrinos to the Z-boson. At
present, measurements at LEP and CHARM II are capable of constraining the
left-handed Z\nu\nu-coupling, 0.45 <~ g_L <~ 0.5, while the right-handed one is
only mildly bounded, |g_R| <= 0.2. We show that measurements at a future e+e-
linear collider at different center-of-mass energies, \sqrt{s} = MZ and
\sqrt{s}s ~ 170 GeV, would translate into a markedly more precise measurement
of the Z\nu\nu-couplings. A statistically significant deviation from Standard
Model predictions will point toward different new physics mechanisms, depending
on whether the discrepancy appears in the direct or the indirect measurement of
the invisible Z-width. We discuss some scenarios which illustrate the ability
of different invisible Z-boson decay measurements to constrain new physics
beyond the Standard Model.


title: Neutrino Oscillations, Solar Antineutrinos and the Solar Magnetic Fields

abstract:
  Even after the confirmation of the large mixing angle (LMA) solution of the
solar neutrino problem, the scope for resonant spin- flavor precession (RSFP)
transitions as a subdominant effect still exists. In this work,we have
considered suitably suppressed RSFP transitions in addition to the dominant LMA
flavor transitions and translated the bounds on the antineutrino flux into the
bounds on the product of neutrino magnetic moment and solar magnetic field. The
low and intermediate energy neutrinos have been included in the analysis by
obtaining indirect bounds on the corresponding antineutrino fluxes for these
components. It is assumed that the missing beryllium neutrinos are being
converted into muon antineutrinos via RSFP transitions in the Sun.


title:
Addendum to: Solar neutrino oscillation parameters after first KamLAND
  results

abstract:
  In a previous paper [1], we presented a three-flavour oscillation analysis of
the solar neutrino measurements and of the first data from the KamLAND
experiment, in terms of the relevant mass-mixing parameters (delta m^2,
theta_12, theta_13). The analysis, performed by including the terrestrial
neutrino constraints coming from the CHOOZ (reactor), KEK-to-Kamioka (K2K,
accelerator) and Super-Kamiokande (SK, atmospheric) experiments, provided a
stringent upper limit on theta_13, namely, sin^2(theta_13)<0.05 at 3 sigma. We
reexamine such upper bound in the light of a recent (although preliminary)
reanalysis of atmospheric neutrino data performed by the SK collaboration,
which seems to shift the preferred value of the largest neutrino square mass
difference Delta m^2 downwards. By taking the results of the SK official
reanalysis at face value, and by repeating the analysis in [1] with such a new
input, we find that the upper bound on theta_{13} is somewhat relaxed:
sin^2(theta_13)<0.067 at 3 sigma. Related phenomenological issues are briefly
discussed.


title: How Pomerons Meet in Coloured Glass

abstract:
  We compute the perturbative one-to-three Pomeron vertex in the colour glass
condensate using the extended generalized leading logarithmic approximation in
high energy QCD. The vertex is shown to be a conformal four-point function in
two-dimensional impact parameter space. Our result can be used to compare
different theoretical descriptions of the colour glass condensate.


title: Parton-Hadron Duality in Unpolarised and Polarised Structure Functions

abstract:
  We study the phenomenon of parton-hadron duality in both polarised and
unpolarised electron proton scattering using the HERMES and the Jefferson Lab
data, respectively. In both cases we extend a systematic perturbative QCD based
analysis to the integrals of the structure functions in the resonance region.
After subtracting target mass corrections and large x resummation effects, we
extract the remaining power corrections up to order 1/Q^2. We find a sizeable
suppression of these terms with respect to analyses using deep inelastic
scattering data. The suppression appears consistently in both polarised and
unpolarised data, except for the low Q^2 polarised data, where a large negative
higher twist contribution remains. Possible scenarios generating this behavior
are discussed.


title: Neutral Pion Decay Width in a Hot and Dense Medium

abstract:
  We study the behavior of the $\pi^0$ width as a function of temperature and
density. We provide simple expressions for the neutral pion width in a hot and
dense medium based on a renormalized version of the microscopic Nambu Jona
Lasinio model. Then we consider the two cases where the pion mass is finite or
vanishes at the critical temperature and discuss the phenomenological
consequences of both cases.


title: The $\Lambda$(1600): A Strange Hybrid Baryon

abstract:
  We use the method of QCD sum rules to investigate a possible hybrid baryon
with the quantum numbers of the $\Lambda$. Using a current composed of uds
quarks in a color octet and a gluon, a strange hybrid, the $\Lambda_H$ is found
about 500 MeV above the $\Lambda$, and we identify it as the $\Lambda(1600)$.
Using our sigma/glueball model we predict a large branching fraction for the
$\Lambda_H \to \Lambda + \sigma(\pi\pi$ resonance), and the experimental search
for this decay mode could provide a test of the hybrid nature of the
$/Lambda(1600)$.


title:
Neutralino Pair Production and 3-Body Decays at $e^+e^-$ Linear
  Colliders as Probes of CP Violation in the Neutralino System

abstract:
  In the CP-invariant supersymmetric theories, the steep S-wave (slow P-wave)
rise of the cross section for any non-diagonal neutralino pair production in
$e^+ e^-$ annihilation, $e^+e^- \to \tilde{\chi}^0_i \tilde{\chi}^0_j$ ($i \neq
j$), near threshold is accompanied by the slow P-wave (steep S-wave) decrease
of the fermion invariant mass distribution of the 3-body neutralino decay,
$\tilde{\chi}^0_i \to \tilde{\chi}^0_j f\bar{f}$ ($f=l$ or $q$), near the end
point. These selection rules, unique to the neutralino system due to its
Majorana nature, guarantee that the observation of simultaneous sharp S-wave
excitations of the production cross section near threshold and the lepton and
quark invariant mass distribution near the end point is a qualitative,
unambiguous evidence for CP violation in the neutralino system.


title: Fermion Masses and Mixing in Extended Technicolor Models

abstract:
  We study fermion masses and mixing angles, including the generation of a
seesaw mechanism for the neutrinos, in extended technicolor (ETC) theories. We
formulate an approach to these problems that relies on assigning right-handed
$Q=-1/3$ quarks and charged leptons to ETC representations that are conjugates
of those of the corresponding left-handed fermions. This leads to a natural
suppression of these masses relative to the $Q=2/3$ quarks, as well as the
generation of quark mixing angles, both long-standing challenges for ETC
theories. Standard-model-singlet neutrinos are assigned to ETC representations
that provide a similar suppression of neutrino Dirac masses, as well as the
possibility of a realistic seesaw mechanism with no mass scale above the
highest ETC scale of roughly $10^3$ TeV. A simple model based on the ETC group
SU(5) is constructed and analyzed. This model leads to non-trivial, but not
realistic mixing angles in the quark and lepton sectors. It can also produce
sufficiently light neutrinos, although not simultaneously with a realistic
quark spectrum. We discuss several aspects of the phenomenology of this class
of models.


title: Dynamical Symmetry Breaking in Randall-Sundrum Background

abstract:
  Characteristic features of dynamical symmetry breaking are investigated in
Randall-Sundrum (RS) background. To study the influence of bulk fermion or bulk
gauge field I consider a five-dimensional four-fermion interaction model and a
non-Abelian gauge field theory as simple models where the chiral symmetry is
broken down dynamically. Using a four-dimensional Lagrangian induced from the
five-dimensional theory, I calculate the dynamically generated fermion mass and
show how the extra dimension affects the chiral phase transition in the RS
background.


title:
The Axialvector-Vector Amplitude and Neutrino Effective Charge in a
  Magnetized Medium

abstract:
  To one loop the effective neutrino photon interaction takes place through the
vector-vector type and the axialvector-vector type amplitude. In this work we
explicitly write down the form of the axialvector-vector amplitude to all
orders in the external magnetic field in a medium. We then infer upon its zero
external momentum limit which contributes to the effective charge of the
neutrinos inside a magnetized medium. We further show its gauge invariance
properties.


title:
SU(3) trits of orbifolded E_8 x E_8' heterotic string and supersymmetric
  standard model

abstract:
  We present $Z_3$ orbifold compactifications of $E_8\times E_8^\prime$
heterotic string with three Wilson lines, resulting to the maximum number of
SU(3) factors. Here, all the matter spectrums are in the SU(3) trits($\equiv $
three representations ${\bf 3,\bar 3,1}$) of the $SU(3)^8$ GUT. Using this
information, we show how three family supersymmetric standard models(SSM) can
be obtained. Also, the low lying interesting representations(fundamental and
adjoint) of $E_6$ and $E_8$ are given in terms of trits, establishing simple
criteria for treating these low lying representations of exceptional groups.


title:
Magnetic moment of the rho-meson in QCD sum rules: perturbative
  corrections

abstract:
  The magnetic moment of the rho-meson is calculated in the framework of QCD
sum rules in external fields. Perturbative corrections are taken into account.
Bare loop calculations (parton model) give the value 2.0. The nonperturbative
effects (operators of dimension 6) result in negative contribution, whereas
perturbative corrections -- positive one. The final answer is 1.8.


title: Correlations and Equilibration in Relativistic Quantum Systems

abstract:
  In this article we study the time evolution of an interacting field
theoretical system, i.e. \phi^4-field theory in 2+1 space-time dimensions, on
the basis of the Kadanoff-Baym equations for a spatially homogeneous system
including the self-consistent tadpole and sunset self-energies. We find that
equilibration is achieved only by inclusion of the sunset self-energy.
Simultaneously, the time evolution of the scalar particle spectral function is
studied for various initial states. We also compare associated solutions of the
corresponding Boltzmann equation to the full Kadanoff-Baym theory. This
comparison shows that a consistent inclusion of the spectral function has a
significant impact on the equilibration rates only if the width of the spectral
function becomes larger than 1/3 of the particle mass. Furthermore, based on
these findings, the conventional transport of particles in the on-shell
quasiparticle limit is extended to particles of finite life time by means of a
dynamical spectral function A(X,\vec{p},M^2). The off-shell propagation is
implemented in the Hadron-String-Dynamics (HSD) transport code and applied to
the dynamics of nucleus-nucleus collisions.


title: Bose-Einstein condensation in the canonical ensemble

abstract:
  Large-volume, high-temperature Bose-Einstein condensation is illustrated for
a relativistic O(2)-invariant scalar field with fixed charge using the
canonical ensemble. The standard, grand canonical results are reproduced for
the infinite-volume limit. Finite-volume corrections are calculated in the
canonical ensemble and the results are found to differ from the finite-volume
grand canonical approximation in a consistent qualitative way.


title: Implications of $B_s\to \mu^{+}\mu^{-}$ in SO(10)-like Models

abstract:
  We examine the potentially very promising signal $B_s\to \mu^{+}\mu^{-}$ in
supersymmetry with large $\tan\beta$ in a {\em top-down} approach starting from
the best fits of an SO(10)-like model studied recently. Our results go beyond
minimal flavour violation investigated in previous works. We show that the
absolute best fits provide a signal for $B_s\to \mu^{+}\mu^{-}$ at the
borderline of the present limits and hence the ongoing search at the Tevatron
will start having an impact on the global analysis of this class of SUSY
models. We discuss the implications of a measurement of $B_s\to \mu^{+}\mu^{-}$
for restricting the parameter space of gauginos and sfermion masses, and of
signals in other channels $B_{d,s}\to l^{+}+l^{-}$. We also discuss
correlations of $B_s\to \mu^{+}\mu^{-}$ with the CP-odd Higgs mass, $\sin
(\beta -\alpha)$ and $b\to s \gamma$ in SO(10)-like models.


title: General analysis of CP violation in polarized (b -> d l^+ l^-) decay

abstract:
  The CP violating asymmetries in the (b -> d l^+ l^-) decay, when one of the
leptons is polarized, is investigated using the most general form of the
effective Hamiltonian. The sensitivity of the CP violating asymmetries on the
new Wilson coefficients is studied.


title:
Impact of the QCD four-quark condensate on in-medium spectral changes of
  light vector mesons

abstract:
  Within the Borel QCD sum rule approach at finite baryon density we study the
role of the four-quark condensates for the modifications of the vector mesons
$\rho$, $\omega$ and $\phi$ in nuclear matter. We find that in-medium
modifications of the $\rho$ and $\omega$ mesons are essentially dominated by
the dependence of the 4-quark condensate on the nucleon density. In particular,
the numerical value of a parameter ($\kappa_N$), which describes the strength
of the density dependence of the 4-quark condensate beyond the mean-field
approximation, governs the decrease of the $\rho$ mass as a function of the
density. For the $\omega$ meson the sign of the in-medium mass shift is changed
by variations of $\kappa_N$. To study consistently the in-medium broadening of
the light vector mesons we employ $\rho N$ and $\omega N$ scattering amplitudes
derived recently from a covariant unitary coupled channel approach adjusted to
pion- and photo-induced reactions. In contrast to the $\rho$ and $\omega$
mesons, the in-medium mass of the $\phi$ meson is directly related to the
chiral (strange) quark condensate. Measurements of the vector meson spectral
change in heavy-ion collisions with HADES can shed light on the yet unknown
density dependence of the 4-quark condensate.


title: Invalid Ward-Takahashi identities and broken unitarity of the SM

abstract:
  It is found that in the SM the Ward-Takahashi(WT) identities of the
axial-vector currents and the charged vector currents of fermions are invalid
after spontaneous symmetry breaking. The spin-0 components of Z and W fields
are revealed from the invalidity of these WT identities. The masses of these
spin-0 components are at $10^{14}$GeV. They are ghosts. Therefore, unitarity of
the SM after spontaneous symmetry breaking is broken at $10^{14}$GeV.


title:
Bound q-bar q systems in the framework of two-body Dirac equations
  obtained from different versions of 3D-reductions of the Bethe-Salpeter
  Equations

abstract:
  The two-body Dirac equations for the bound q bar q systems are obtained from
the different (five) versions of the 3D-equations derived from Bethe-Salpeter
equation with the instantaneous kernel in the momentum space using the
additional approximations. There are formulated the normalization conditions
for the wave functions satisfying the obtained two-body Dirac equations. The
spin structure of the confining qq interaction potential is taken in the form x
gamma0 X gamma0 + (1-x) I X I, with 0 < x < 1. It is shown that the two-body
Dirac equations obtained from the Salpeter equation does not depend on x. As to
other four versions such a dependence is left. For the systems (u bar s), (c
bar u), (c bar s) the dependence of the stable solutions of the Dirac equations
obtained in the different version on the mixture parameter x is investigated
and results is compared with such dependence of 3D-equations derived from
Bethe-Salpeter equations without the additional approximation and some new
conclusions are obtained.


title:
The Theta+ (1540) as a heptaquark with the overlap of a pion, a kaon and
  a nucleon

abstract:
  We study the very recently discovered Theta+ (1540) at SPring-8, at ITEP and
at CLAS-Thomas Jefferson Lab. We apply the same RGM techniques that already
explained with success the repulsive hard core of nucleon-nucleon, kaon-nucleon
exotic scattering, and the attractive hard core present in pion-nucleon and
pion-pion non-exotic scattering. We find that the K-N repulsion excludes the
Theta+ as a K-N s-wave pentaquark. We explore the Theta+ as a heptaquark,
equivalent to a N+pi+K borromean bound-state, with positive parity and total
isospin I=0. We find that the kaon-nucleon repulsion is cancelled by the
attraction existing both in the pion-nucleon and pion-kaon channels. Although
we are not yet able to bind the total three body system, we find that the
Theta^+ may still be a heptaquark state. We conclude with predictions that can
be tested experimentally.


title: Gaussian Sum-Rule Analysis of Scalar Gluonium and Quark Mesons

abstract:
  Gaussian sum-rules, which are related to a two-parameter Gaussian-weighted
integral of a hadronic spectral function, are able to examine the possibility
that more than one resonance makes a significant contribution to the spectral
function. The Gaussian sum-rules, including instanton effects, for scalar
gluonic and non-strange scalar quark currents clearly indicate a distribution
of the resonance strength in their respective spectral functions. Furthermore,
analysis of a two narrow resonance model leads to excellent agreement between
theory and phenomenology in both channels. The scalar quark and gluonic
sum-rules are remarkably consistent in their prediction of masses of
approximately 1.0 GeV and 1.4 GeV within this model. Such a similarity would be
expected from hadronic states which are mixtures of gluonium and quark mesons.


title: High-Energy Constraints on the Direct Detection of MSSM Neutralinos

abstract:
  The requirement that the MSSM remain an acceptable effective field theory up
to energies beyond the weak scale constrains the sparticle spectrum, and hence
the permissible ranges of cold dark matter neutralino-proton cross sections.
Specifically, squarks are generally much heavier than sleptons if no tachyons
are to appear before the GUT scale ~10^16 GeV, or even before 10 TeV. We
display explicitly the allowed ranges of effective squark and slepton masses at
the weak scale, and the cross-section ranges allowed if the MSSM is to remain
valid without tachyons up to 10 TeV or the GUT scale. The allowed areas in the
cross section-mass plane for both spin-independent and spin-dependent
scattering are significantly smaller than would be allowed if the MSSM were
required to be valid only around the weak scale. In addition to a reduction in
the maximum cross section, the upper limit on the neutralino mass is greatly
reduced when tachyons are avoided, particularly for smaller values of the
squark masses.


title: Saturation Physics in Heavy Ion Collisions

abstract:
  We discuss expectations of saturation physics for various observables in
heavy ion collisions. We show how simple saturation-inspired assumptions about
particle production in heavy ion collisions lead to Kharzeev-Levin-Nardi model.
Comparing this model to RHIC data on particle multiplicities we conclude that
saturation effects may play an important role in particle production and
dynamics at the early stages of Au-Au collisions already at RHIC energies. We
then estimate the contribution of the initial state two-particle azimuthal
correlations to elliptic flow observable v_2 in Au-Au collisions by
constructing a lower bound on these non-flow effects based on v_2 obtained from
the analysis of proton-proton (pp) collisions.


title: Dynamical Low-Mass Fermion Generation in Randall-Sundrum Background

abstract:
  It is investigated that a dynamical mechanism to generate a low mass fermion
in Randall-Sundrum (RS) background. We consider a five-dimensional four-
fermion interaction model with two kinds of bulk fermion fields and take all
the mass scale in the five-dimensional spacetime at the Planck scale.
Evaluating the effective potential of the induced four-dimensional model, I
calculate the dynamically generated fermion mass. It is shown that dynamical
symmetry breaking takes place and one of the fermion mass is generated at the
electroweak scale in four dimensions.


title: On the origin of the large scale structures of the universe

abstract:
  We revise the statistical properties of the primordial cosmological density
anisotropies that, at the time of matter radiation equality, seeded the
gravitational development of large scale structures in the, otherwise,
homogeneous and isotropic Friedmann-Robertson-Walker flat universe. Our
analysis shows that random fluctuations of the density field at the same
instant of equality and with comoving wavelength shorter than the causal
horizon at that time can naturally account, when globally constrained to
conserve the total mass (energy) of the system, for the observed scale
invariance of the anisotropies over cosmologically large comoving volumes.
Statistical systems with similar features are generically known as glass-like
or lattice-like. Obviously, these conclusions conflict with the widely accepted
understanding of the primordial structures reported in the literature, which
requires an epoch of inflationary cosmology to precede the standard expansion
of the universe. The origin of the conflict must be found in the widespread,
but unjustified, claim that scale invariant mass (energy) anisotropies at the
instant of equality over comoving volumes of cosmological size, larger than the
causal horizon at the time, must be generated by fluctuations in the density
field with comparably large comoving wavelength.


title: Theoretical tools for a future e+e- linear collider

abstract:
  Recent progress in the calculation of radiative corrections and in Monte
Carlo event generation, relevant for a future e+e- linear collider, is
reviewed.


title:
GRACE at ONE-LOOP: Automatic calculation of 1-loop diagrams in the
  electroweak theory with gauge parameter independence checks

abstract:
  We describe the main building blocks of a generic automated package for the
calculation of Feynman diagrams. These blocks include the generation and
creation of a model file, the graph generation, the symbolic calculation at an
intermediate level of the Dirac and tensor algebra, implementation of the loop
integrals, the generation of the matrix elements or helicity amplitudes,
methods for the phase space integrations and eventually the event generation.
The report focuses on the fully automated systems for the calculation of
physical processes based on the experience in developing GRACE-loop. As such, a
detailed description of the renormalisation procedure in the Standard Model is
given emphasizing the central role played by the non-linear gauge fixing
conditions for the construction of such automated codes. The need for such
gauges is better appreciated when it comes to devising efficient and powerful
algorithms for the reduction of the tensorial structures of the loop integrals.
A new technique for these reduction algorithms is described. Explicit formulae
for all two-point functions in a generalised non-linear gauge are given,
together with the complete set of counterterms. We also show how infrared
divergences are dealt with in the system. We give a comprehensive presentation
of some systematic test-runs which have been performed at the one-loop level
for a wide variety of two-to-two processes to show the validity of the gauge
check. These cover fermion-fermion scattering, gauge boson scattering into
fermions, gauge bosons and Higgs bosons scattering processes. Comparisons with
existing results on some one-loop computation in the Standard Model show
excellent agreement. We also briefly recount some recent development concerning
the calculation of mutli-leg one-loop corrections.


title: QCD axion and quintessential axion

abstract:
  The axion solution of the strong CP problem is reviewed together with the
other strong CP solutions. We also point out the quintessential
axion(quintaxion) whose potential can be extremely flat due to the tiny ratio
of the hidden sector quark mass and the intermediate hidden sector scale. The
quintaxion candidates are supposed to be the string theory axions, the model
independent or the model dependent axions.


title: What could be learnt from Positronium for Quarkonium?

abstract:
  In order to fulfill Low's theorem requirements, a new lowest order basis for
bound state decay computations is proposed, in which the binding energy is
treated non-perturbatively. The properties of the method are sketched by
reviewing standard positronium decay processes. Then, it is shown how applying
the method to quarkonia sheds new light on some longstanding puzzles.


title: BBN bounds on active-sterile neutrino mixing

abstract:
  Nucleosynthesis restrictions on mixing of active neutrinos with possible
sterile ones are obtained with the account of experimentally determined mixing
between all active neutrinos. The earlier derived bounds, valid in the absence
of active-active mixing, are reanalyzed and significant difference is found in
the resonance case. The results are obtained both analytically and numerically
by solution of complete system of integro-differential kinetic equations. A
good agreement between analytical and numerical approaches is demonstrated. A
role of possibly large cosmological lepton asymmetry is discussed.