title: Kinks in the Hartree approximation

abstract:
  The topological defects of the lambda phi^4 theory, kink and antikink, are
studied in the Hartree approximation. This allows us to discuss quantum effects
on the defects in both stationary and dynamical systems. The kink mass is
calculated for a number of parameters, and compared to classical, one loop and
Monte Carlo results known from the literature. We discuss the thermalization of
the system after a kink antikink collision. A classical result, the existence
of a critical speed, is rederived and shown for the first time in the quantum
theory. We also use kink antikink collisions as a very simple toy model for
heavy ion collisions and discuss the differences and similarities, for example
in the pressure. Finally, using the Hartree Ensemble Approximation allows us to
study kink antikink nucleation starting from a thermal (Bose Einstein)
distribution. In general our results indicate that on a qualitative level there
are few differences with the classical results, but on a quantitative level
there are some import ones.


title: Leptogenesis from Supersymmetry Breaking

abstract:
  We show that soft supersymmetry breaking terms involving the heavy sneutrinos
can lead to sneutrino-antisneutrino mixing and to new sources of CP violation,
which are present even if a single generation is considered. These terms are
naturally present in supersymmetric versions of leptogenesis scenarios, and
they induce indirect CP violation in the decays of the heavy sneutrinos,
eventually generating a baryon asymmetry. This new contribution can be
comparable to or even dominate over the asymmetry produced in traditional
leptogenesis scenarios.


title: Chiral Dynamics in the Meson Sector at two Loops

abstract:
  I give a very short introduction to Chiral Perturbation Theory and an
overview of the next-to-next-to-leading order three-flavour calculations done.
I discuss those relevant for an improvement in the accuracy of the measurement
of $V_{us}$ in more detail. One major conclusion is that all needed $p^6$ low
energy constants can be obtained from experiment via the scalar form-factor in
$K_{\ell3}$ decays.


title: On the Electric Charge of the Neutrino

abstract:
  Exact expression is obtained for the differential cross section of elastic
electroweak scattering of longitudinal polarized massive Dirac neutrinos with
the electric charge and anomalous magnetic moment on a spinless nucleus. This
formula contains all necessary information about the nature of the neutrino
mass, charge and magnetic moment. Some of them state that between the mass of
the neutrino its electric charge there exists an interconnection.


title:
The masses of $D_{sj}^\ast$(2317) and $D_{sj}^\ast$(2463) in the MIT bag
  model

abstract:
  The masses of the $D_{sj}^\ast$(2317)and $D_{sj}^\ast$(2463) were found in
the MIT bag model in a reasonable agreement with the experimental values. The
spectrum of ${0^\pm,1^\pm}$ for $D$ and $B$ mesons is presented. The equalities
between the mass splittings $(1^+ - 1^-)(c\bar{q})\approx (1^+ -
1^-)(c\bar{s})$ and $(0^+ - 0^-)(c\bar{q})\approx (0^+ - 0^-)(c\bar{s})$, where
$q=u, d$ are confirmed despite of the fact that $SU(3)_L\times SU(3)_R$ chiral
symmetry is broken by the non-zero strange quark mass.


title:
Random phase approximation and its extension for the quantum O(2)
  anharmonic oscillator

abstract:
  We apply the random phase approximation (RPA) and its extension called
renormalized RPA to the quantum anharmonic oscillator with an O(2) symmetry. We
first obtain the equation for the RPA frequencies in the standard and in the
renormalized RPA approximations using the equation of motion method. In the
case where the ground state has a broken symmetry, we check the existence of a
zero frequency in the standard and in the renormalized RPA approximations. Then
we use a time-dependent approach where the standard RPA frequencies are
obtained as small oscillations around the static solution in the time-dependent
Hartree-Bogoliubov equation. We draw a parallel between the two approaches.


title:
Diffractive electroproduction of two mesons separated by a large
  rapidity gap

abstract:
  We consider the process gamma^* N -> M_1 M_2 N' with a large rapidity gap
between the two mesons M_1 and M_2. Within the QCD collinear approximation, the
scattering amplitude may be written as a convolution of an impact factor
describing the gamma^* -> M_1 transition and an amplitude describing the N ->
M_2 N' collinear process.


title:
The gluon content of the $\eta$ and $\eta^{\prime}$ mesons and the
  $\eta\gamma$, $\eta^{\prime}\gamma$ electromagnetic transition form factors

abstract:
  We compute power-suppressed corrections to the \eta\gamma and
\eta^{\prime}\gamma transition form factors
Q^2F_{\eta(\eta^{\prime})\gamma}(Q^2) arising from the end point regions x \to
0,1 by employing the infrared-renormalon approach. The contribution to the form
factors from the quark and gluon content of the \eta,\eta^{\prime} mesons is
taken into account using for the \eta-\eta^{\prime} mixing the SU_f(3) singlet
\eta_1 and octet \eta_8 basis. The theoretical predictions obtained this way
are compared with the corresponding CLEO data and restrictions on the input
parameters (Gegenbauer coefficients) B_2^q(\eta_1), B_2^g(\eta_1), and
B_2^q(\eta_8) in the distribution amplitudes for the \eta_1,\eta_8 states with
one nonasymptotic term are deduced. Comparison is made with the results from
QCD perturbation theory.


title: Solving Recurrence Relations for Multi-Loop Feynman Integrals

abstract:
  We study the problem of solving integration-by-parts recurrence relations for
a given class of Feynman integrals which is characterized by an arbitrary
polynomial in the numerator and arbitrary integer powers of propagators, {\it
i.e.}, the problem of expressing any Feynman integral from this class as a
linear combination of master integrals. We show how the parametric
representation invented by Baikov can be used to characterize the master
integrals and to construct an algorithm for evaluating the corresponding
coefficient functions. To illustrate this procedure we use simple one-loop
examples as well as the class of diagrams appearing in the calculation of the
two-loop heavy quark potential.


title:
Functional integrals for QCD at nonzero chemical potential and zero
  density

abstract:
  In a Euclidean space functional integral treatment of the free energy of QCD,
a chemical potential enters only through the functional determinant of the
Dirac operator which for any flavor is $\dslash + m - \mu_f \gamma_0$ (where
$\mu_f$ is the chemical potential for the given flavor). Any nonzero $\mu$
alters all of the eigenvalues of the Dirac operator relative to the $\mu=0$
value, leading to a naive expectation that the determinant is altered and which
thereby alters the free energy. Phenomenologically, this does not occur at T=0
for sufficiently small $\mu$, in contradiction to this naive expectation. The
problem of how to understand this phenomenological behavior in terms functional
integrals is solved for the case of an isospin chemical through the study of
the spectrum of the operator $\gamma_0 (\dslash + m)$.


title: Geometric Scaling in Inclusive Charm Production

abstract:
  We show that the cross section for inclusive charm production exhibits
geometric scaling in a large range of photon virtualities. In the HERA
kinematic domain the saturation momentum $Q_{sat}^2(x)$ stays below the hard
scale $\mu_c^2=4m_c^2$, implying charm production probing mostly the color
transparency regime and unitarization effects being almost negligible. We
derive our results considering two saturation models which are able to describe
the DESY ep collider HERA data for the proton structure function at small
values of the Bjorken variable $x$. A striking feature is the scaling on
$\tau=Q_2^2/Q_{sat}^2(x)$ above saturation limit, corroborating recent
theoretical studies.


title:
Lepton Flavour Violation from Yukawa Operators, Supergravity and the
  See-Saw mechanism

abstract:
  We investigate the phenomenological impact of different sources of lepton
flavour violation arising from realistic models based on supergravity mediated
supersymmetry breaking with Yukawa operators. We discuss four distinct sources
of lepton flavour violation in such models: minimum flavour violation, arising
from neutrino masses and the see-saw mechanism with RG running; supergravity
flavour violation due to the non-universal structure of the supergravity model;
flavour violation due to Froggatt-Nielsen (FN) fields appearing in Yukawa
operators developing supersymmetry breaking F-terms and contributing in a
non-universal way to soft trilinear terms; and finally heavy Higgs flavour
violation arising from the heavy Higgs fields used to break the unified gauge
symmetry which also appear in Yukawa operators and behave analagously to the FN
fields. In order to quantify the relative effects, we study a particular type I
string inspired model based on a supersymmetric Pati-Salam model arising from
intersecting D-branes, supplemented by a U(1) family symmetry


title:
The $\eta^\prime g^* g^{(*)}$ Vertex Including the $\eta^\prime$-Meson
  Mass

abstract:
  The $\eta^\prime g^* g^{(*)}$ effective vertex function is calculated in the
QCD hard-scattering approach, taking into account the $\eta^\prime$-meson mass.
We work in the approximation in which only one non-leading Gegenbauer moment
for both the quark-antiquark and the gluonic light-cone distribution amplitudes
for the $\eta^\prime$-meson is kept. The vertex function with one off-shell
gluon is shown to have the form (valid for $| q_1^2 | > m_{\eta^\prime}^2$)
$F_{\eta^\prime g^* g} (q_1^2, 0, m_{\eta^\prime}^2) = m_{\eta^\prime}^2
H(q_1^2)/(q_1^2 - m_{\eta^\prime}^2)$, where $H(q_1^2)$ is a slowly varying
function, derived analytically in this paper. The resulting vertex function is
in agreement with the phenomenologically inferred form of this vertex obtained
from an analysis of the CLEO data on the $\eta^\prime$-meson energy spectrum in
the decay $\Upsilon(1S) \to \eta^\prime X$. We also present an interpolating
formula for the vertex function $F_{\eta^\prime g^* g} (q_1^2, 0,
m_{\eta^\prime}^2)$ for the space-like region of the virtuality $q_1^2$, which
satisfies the QCD anomaly normalization for on-shell gluons and the
perturbative-QCD result for the gluon virtuality $| q_1^2| \gtrsim 2$ GeV$^2$.


title: Correlated neutral B meson decays into CP eigenstates

abstract:
  In the two correlated $B$ meson decay experiment we propose to measure
intensities relating CP eigenstate ($J/\psi K_{S,L}$) decays on $both$ sides,
which will be measurable in future upgrades of KEK and PEP. As a CP-forbidden
transition, we obtain $I(J/\psi K_S, J/\psi K_S, \Delta t) \sim \sin ^2
(2\beta)$. We calculate in a model independent way all the possible intensities
relating final CP and flavour eigenstate decays. Under CPT-invariance, the
asymmetries for processes related by CP$\Delta t$ vanish for $\Delta \Gamma =0$
and measure $\Delta \Gamma$ linearly. We notice the impossibility to isolate
the sign of $\cos (2\bet a)$ without an independent knowledge of the sign of
$\Delta \Gamma$. This exhaustion of the possible Golden Plate and flavour
decays provides new observables which may throw light in our present
understanding of CKM physics.


title:
W and Higgs particle distributions during electroweak tachyonic
  preheating

abstract:
  We study out-of-equilibrium quasi-particle distributions of the Higgs and W
fields during the zero-temperature tachyonic electroweak transition that has
been assumed in recent scenarios of baryogenesis. Approximating the process by
a fast quench, we perform classical real-time lattice simulations in the
SU(2)-Higgs model. The emerging quasi-particle numbers and energies are then
used to determine the effective temperatures, chemical potentials and masses of
the particles shortly after the transition.


title: Rates and Asymmetries in $B \to K \pi$ Decays

abstract:
  We discuss a potential discrepancy in an approximate relation among $B \to K
\pi$ rates which, with increased statistical significance, would imply new
physics in $\Delta I=1$ transitions. An approximate relation between
CP-violating rate differences in $B^0/\bar{B}^0 \to K^{\pm}\pi^{\mp}$ and
$B^{\pm} \to K^{\pm}\pi^0$ is used to combine these rate differences to reduce
upper limits on the two CP asymmetries. These rates and asymmetries are used to
update bounds on the CKM phase $\gamma$.


title:
Single Photon Signals for Warped Quantum Gravity at a Linear e+-e-
  Collider

abstract:
  We study the `single photon' process e+- e- -> gamma nu nubar with
contributions due to exchange of massive gravitons in the Randall- Sundrum
model of low-scale quantum gravity. It is shown that for significant regions in
the parameter space, this process unambiguously highlights the resonance
structure of the graviton sector. Even in the non-resonant part of the
parameter space, we show that comparison with the benchmark process e+- e- ->
mu+- mu- can clearly distinguish signals for warped gravity from similar
signals for large extra dimensions.


title: Particle Correlations at High Partonic Density

abstract:
  We discuss manifestations of the particle correlations at high partonic
density in the heavy-ion collisions at RHIC. In particular, we argue that the
elliptic flow variable v2 is dominated by particle correlations at high pT.


title: What Can we learn from Cosmic Rays?

abstract:
  Ultra high energy cosmic rays (UHECR) pose a problem either for particle
physics or for astrophysics (or for both) by the unexpectedly high number of
cosmic ray showers observed with energy above about 5x10^{19}eV, the
Greisen-Zatsepin-Kuzmin (GZK) cutoff. Our emphasis is on those possible
solutions of the puzzle which assume that ultra high energy neutrinos travel
cosmic distances. We present, in detail, a model which is based on a low energy
(50 to 100 TeV) transition to a higher than four dimensional string regime.
Neutrino-quark cross sections grow exponentially close to the threshold of this
new scale because of the fast increase of the density of string states and
effectively acquire hadronic strength.


title: Strings, Black Holes and the Extreme Energy Cosmic Rays

abstract:
  In a large class of models the string excitation and black hole pictures
invoked as an explanation of trans-GZK cosmic ray events are equivalent. Single
particle inclusive distributions are thermal at the Hagedorn temperature. The
hadron multiplicities are reminiscent of multiplicities in heavy nucleus
initiated interactions.


title:
Vector meson couplings to vector and tensor currents in extended NJL
  quark model

abstract:
  A simple explanation of the dynamic properties of vector mesons is given in
the framework of extended Nambu - Jona-Lasinio quark model. New mass relations
among the hadron vector resonances are derived. The results of this approach
are in good accordance with the QCD sum rules, the lattice calculations and the
experimental data.


title:
Evaluation of two-loop self-energy basis integrals using differential
  equations

abstract:
  I study the Feynman integrals needed to compute two-loop self-energy
functions for general masses and external momenta. A convenient basis for these
functions consists of the four integrals obtained at the end of Tarasov's
recurrence relation algorithm. The basis functions are modified here to include
one-loop and two-loop counterterms to render them finite; this simplifies the
presentation of results in practical applications. I find the derivatives of
these basis functions with respect to all squared-mass arguments, the
renormalization scale, and the external momentum invariant, and express the
results algebraically in terms of the basis. This allows all necessary two-loop
self-energy integrals to be efficiently computed numerically using the
differential equation in the external momentum invariant. I also use the
differential equations method to derive analytic forms for various special
cases, including a four-propagator integral with three distinct non-zero
masses.


title:
Chiral Doubling of Heavy-Light Hadrons: BaBar 2317 MeV and CLEO 2463 MeV
  Discoveries

abstract:
  We point out that the very recent discoveries of BaBar (2317) and CLEO II
(2460) are consistent with the general pattern of spontaneous breaking of
chiral symmetry in hadrons built of heavy and light quarks, as originally
suggested by us in 1992, and independently by Bardeen and Hill in 1993. The
splitting between the chiral doublers follows from a mixing between the light
constituent quark mass and the velocity of the heavy quark, and vanishes for a
zero constituent quark mass. The general strictures of spontaneous chiral
symmetry breaking constrain the axial charges in the chiral multiplet, and
yield a mass splitting between the chiral doublers of about 345 MeV when the
pion coupling to the doublers is half its coupling to a free quark. The chiral
corrections are small. This phenomenon is generic and extends to all
heavy-light hadrons. We predict the mass splitting for the chiral doublers of
the excited mesons (D1,D2). We suggest that the heavy-light doubling can be
used to address issues of chiral symmetry restoration in dense and/or hot
hadronic matter. In particular, the relative splitting between D and D* mesons
and their chiral partners decreases in matter, with consequences on charmonium
evolution at RHIC.


title:
Understanding the Non-Perturbative Deep-Inelastic Scattering:
  Instanton-induced Inelastic Dipole-Dipole Cross Section

abstract:
  We derive the semiclassical (instanton-induced) contribution to the inelastic
cross section of two color dipoles at large $\sqrt{s}$. We study its dependence
on the dipole sizes, orientations and, most importantly, the impact parameter.
The inelastic cross section is approximately quadratic in the dipole sizes, and
Gaussian-like in the impact parameter with a width of the order of the
instanton size. These results are directly relevant to double DIS
$\gamma^*\gamma^*$, as well as $\gamma^*\gamma$ and standard DIS $\gamma^* h$
at small x when a real photon and a hadron can be approximated by a dipole. For
such cases, with one small dipole scattering on a large dipole, the impact
parameter profile exhibits a width of about 1/2 fm, which is in good agreement
with the impact parameter profile recently extracted from DIS HERA data,
including diffractive $\gamma^*\to J/\psi$.


title: Short and long distance contributions to $B \to K^* \gamma \gamma$

abstract:
  We study the decay of the neutral B meson to $K^* \gamma \gamma$ within the
framework of the Standard Model, including long distance contributions.


title: Nuclear modification of structure functions in lepton scattering

abstract:
  We discuss nuclear structure functions in lepton scattering including
neutrino reactions. First, the determination of nuclear parton distribution
functions is explained by using the data of electron and muon deep inelastic
scattering and those of Drell-Yan processes. Second, NuTeV sin^2 theta_W
anomaly is discussed by focusing on nuclear corrections in the iron target.
Third, we show that the HERMES effect, which indicates nuclear modification of
the longitudinal-transverse structure function ratio, should exist at large x
with small Q^2 in spite of recent experimental denials at small x.


title:
Understanding the nature of $D_s(2317)$ and $D_s(2460)$ through
  nonleptonic B Decays

abstract:
  We consider the nonleptonic B decays $ B \to D^{(*)} D_s(2317)$ and $ B \to
D^{(*)} D_s(2460)$, involving the newly discovered $D_s(2317)$ and the
$D_s(2460)$ states. We find that experiments indicate disagreement with model
calculations of their properties and/or breakdown of the factorization
assumption for these decays . We point out that decays involving $B_s$ mesons
where the $D_s$ resonances can be produced via the weak decay of the $b$ quark
can provide further information about the nature of these newly discovered
states. We also propose a model to calculate the two body nonleptonic decays $
B \to D^{(*)} D_s(2317)(D_s(2460))$, if the $D_s(2317)$ and $D_s(2460)$ are
interpreted as $DK$ and $D^*K$ molecules.


title:
Lattice Matrix Elements and CP Violation in B and K Physics: Status and
  Outlook

abstract:
  Status of lattice calculations of hadron matrix elements along with CP
violation in B and in K systems is reviewed. Lattice has provided useful input
which, in conjunction with experimenatl data, leads to the conclusion that
CP-odd phase in the CKM matrix plays the dominant role in the observed
asymmetry in $B \to \psi K_s$. It is now quite likely that any beyond the SM,
CP-odd, phase will cause only small deviations in B-physics. Search for the
effects of the new phase(s) will consequently require very large data samples
as well as very precise theoretical predictions. Clean determination of {\it
all} the angles of the unitarity triangle therefore becomes essential. In this
regard $B \to K D^0$ processes play a unique role. Regarding K-decays,
remarkable progress made by theory with regard to maintenance of chiral
symmetry on the lattice is briefly discussed. First application already provide
quantitaive information on $B_K$ and the $\Delta I=1/2$ rule. The enhancement
in $Re A_0$ appears to arise solely from tree operators, esp. $Q_2$; penguin
contribution to $Re A_0$ appears to be very small. However, improved
calculations are necessary for $\epsilon^'/epsilon$ as there the contributions
of QCD penguins and electroweak penguins largely seem to cancel. There are good
reasons, though, to believe that these cancellations will not survive
improvements that are now underway. Importance of determining the unitarity
triangle purely from K-decays is also emphasized.


title: Wrong-sign Kaons in B decays and New Physics

abstract:
  New physics can possibly emerge in the B decays into wrong-sign kaons for
which the standard model contributions are extremely suppressed. We analyze
two-body decays of $\bar{B}^0$ and $B^-$ mesons involving the $b\to dd\bar{s}$
($\Delta S=-1$) and $b\to ss\bar{d}$ ($\Delta S=+2$) transitions in a model
independent way, and examine various wrong-sign kaon signals which are expected
to be observed in the future $B$ experiments. Our analysis shows that it would
be possible to identify the origin of new physics through the combined analysis
of several B decay modes involving one or two wrong-sign $K^*$'s.


title: Jets in heavy ion collisions

abstract:
  High energetic particles traversing a dense medium lose a sizable part of
their energy in form of gluon radiation. As a result, the rate of high-$p_t$
particles is expected to be suppressed in heavy ion collisions with respect to
the proton case. Recent experimental data from RHIC strongly support this
scenario. This allows to study the properties of the medium by the amount of
jet quenching it produces. The angular dependence of the radiation is modified
in the medium in a characteristic way. This provides another tool to study the
medium properties in a more differential measurement.


title:
Pseudoscalar qqbar mesons and effective QCD coupling enhanced by <A^2>
  condensate

abstract:
  Recent developments provided evidence that the dimension 2 gluon condensate
<A^2> is important for the nonperturbative regime of Yang-Mills theories
(quantized in the Landau gauge). We show that it may be relevant for the
Dyson-Schwinger approach to QCD. In order that this approach leads to a
successful hadronic phenomenology, an enhancement of the effective quark-gluon
interaction seems to be needed at intermediate (p^2 \sim 0.5 GeV^2) momenta. It
is shown that the gluon condensate <A^2> provides such an enhancement. It is
also shown that the resulting effective strong running coupling leads to the
sufficiently strong dynamical chiral symmetry breaking and successful
phenomenology at least in the light sector of pseudoscalar mesons.


title: The Pion Velocity in Dense Skyrmion Matter

abstract:
  We have developed a field theory formalism to calculate $in$-$medium$
properties of hadrons within a unified approach that exploits a single
Lagrangian to describe simultaneously both matter background and meson
fluctuations. In this paper we discuss the consequences on physical observables
of a possible phase transition of hadronic matter taking place in the chiral
limit. We pay special attention to the pion velocity $v_\pi$, which controls,
through a dispersion relation, the pion propagation in the hadronic medium. The
$v_\pi$ is defined in terms of parameters related to the matrix element in
matter of the axial-vector current, namely, the in-medium pion decay constants,
$f_t$ and $f_s$. Both of the pion decay constants change dramatically with
density and even vanish in the chiral limit when chiral symmetry is restored,
but the pion velocity does not go to zero, decreasing at most 10% over the
whole density range studied. A possible pseudogap structure is indicated.


title:
Nonlinear dynamics of soft boson collective excitations in hot QCD
  plasma II: plasmon -- hard-particle scattering and energy losses

abstract:
  In a general line with our first work (Ann.Phys.302(2002),172;
hep-ph/0207316), within hard thermal loop approximation a general theory of the
scattering for an arbitrary number of colorless plasmons off hard thermal
particles of hot QCD-medium is considered. Using generalized Tsytovich
correspondence principle, a connection between matrix elements of the
scattering processes and a certain effective current, generating these
processes is established. The iterative procedure of calculation of these
matrix elements is defined, and a problem of their gauge-invariance is
discussed. An application of developed theory to a problem of calculating
energy losses of energetic color particle propagating through QCD-medium is
considered. It is shown that for limiting value of the plasmon occupation
number ($\sim 1/g^2$, where $g$ is a strong coupling) energy losses caused by
spontaneous scattering process of energetic particle off soft-gluon waves is of
the same order in the coupling as other known losses type: collision and
radiation ones. The Fokker-Planck equation, describing decceleration
(acceleration) and diffusion in momentum space of beam of energetic color
particles scattering off soft excitations of quark-gluon plasma, is derived.


title:
A New Hypergeometric Representation of One-Loop Scalar Integrals in $d$
  Dimensions

abstract:
  A difference equation w.r.t. space-time dimension $d$ for $n$-point one-loop
integrals with arbitrary momenta and masses is introduced and a solution
presented. The result can in general be written as multiple hypergeometric
series with ratios of different Gram determinants as expansion variables.
Detailed considerations for $2-,3-$ and $4-$point functions are given. For the
$2-$ point function we reproduce a known result in terms of the Gauss
hypergeometric function $_2F_1$. For the $3-$point function an expression in
terms of $_2F_1$ and the Appell hypergeometric function $F_1$ is given. For the
$4-$point function a new representation in terms of $_2F_1$, $F_1$ and the
Lauricella-Saran functions $F_S$ is obtained. For arbitrary $d=4-2\epsilon$,
momenta and masses the $2-,3-$ and $4-$point functions admit a simple one-fold
integral representation. This representation will be useful for the calculation
of contributions from the $\epsilon-$ expansion needed in higher orders of
perturbation theory. Physically interesting examples of $3-$ and $4-$point
functions occurring in Bhabha scattering are investigated.


title:
Prospects for the measurement of B_s oscillations with the ATLAS
  detector at LHC

abstract:
  The prospects for the measurement of $B_{s}^{0}$ oscillations with the ATLAS
detector at the Large Hadron Collider are presented. $B_{s}^{0}$ candidates in
the $D_{s}^{-} \pi^{+}$ and $D_{s}^{-} a_{1}^{+}$ decay modes from semileptonic
events were fully simulated and reconstructed, using a detailed detector
description. The sensitivity and the expected accuracy for the measurement of
the oscillation frequency were derived from unbinned maximum likelihood
amplitude fits as functions of the integrated luminosity. A detailed treatment
of the systematic uncertainties was performed. The dependence of the
measurement sensitivity on various parameters was also evaluated.


title:
Cutoff schemes in chiral perturbation theory and the quark mass
  expansion of the nucleon mass

abstract:
  We discuss the use of cutoff methods in chiral perturbation theory. We
develop a cutoff scheme based on the operator structure of the effective field
theory that allows to suppress high momentum contributions in Goldstone boson
loop integrals and by construction is free of the problems traditional cutoff
schemes have with gauge invariance or chiral symmetries. As an example, we
discuss the chiral expansion of the nucleon mass. Contrary to other claims in
the literature we show that the mass of a nucleon in heavy baryon chiral
perturbation theory has a well behaved chiral expansion up to effective
Goldstone boson masses of 400 MeV when one utilizes standard dimensional
regularization techniques. With the help of the here developed cutoff scheme we
can demonstrate a well-behaved chiral expansion for the nucleon mass up to 600
MeV of effective Goldstone Boson masses. We also discuss in detail the prize,
in numbers of additional short distance operators involved, that has to be paid
for this extended range of applicability of chiral perturbation theory with
cutoff regularization, which is usually not paid attention to. We also compare
the fourth order result for the chiral expansion of the nucleon mass with
lattice results and draw some conclusions about chiral extrapolations based on
such type of representation.


title:
On the Investigation of the Proton Structure Using QED Compton Events in
  ep Scattering

abstract:
  QED Compton scattering at HERA is discussed in terms of the information it
may reveal on the proton structure at low momentum transfers Q2. Detailed Monte
Carlo studies are performed which show that the analysis of inelastic QED
Compton events allows the extension of present HERA structure function
measurements to a kinematic regime, which up to now was only accessed in fixed
target data. For these studies an improved version of the COMPTON event
generator is used, where special emphasis has been put on modelling the
hadronic final state at low invariant masses.
  As the low Q2 regime is sometimes also discussed in the context of the
collinear approximation and the possibility of measuring the photonic content
of the proton, the Monte Carlo studies are also used to check the validity of
this approach. It is found that the proposed concept of a photon density of the
proton does not provide sufficient accuracy for the description of inelastic
QED Compton scattering.


title: Bhabha Scattering with Radiated Gravitons at Linear Colliders

abstract:
  We study the process e+- e- -> e+- e- +- missing energy at a high-energy e+-
e- collider, where the missing energy arises from the radiation of Kaluza-Klein
gravitons in a model with large extra dimensions. It is shown that at a
high-energy linear collider, this process can not only confirm the signature of
such theories but can also sometimes be comparable in effectiveness to the
commonly discussed channel e+- e- -> gamma +- missing energy, especially for a
large number of extra dimensions and with polarized beams. We also suggest some
ways of distinguishing the signals of a graviton tower from other types of new
physics signals by combining data on our suggested channel with those on the
photon-graviton channel.


title: Production of axial-vector D_sJ in e+e- annihilation

abstract:
  If one of the recently discovered charmed-strange mesons (D_sJ(2317)) is the
0+ state of cs-bar, the other (D_sJ(2460)) is most likely the 1+ state with
j=1/2. They could be produced in e+e- annihilation by fragmentation from cc-bar
jets or as decay products of B mesons. If one analyzes the cc-bar jet events
and the B decay events separately, one will have a direct test as to whether
D_sJ(2460) is the j=1/2 state or not, how much D_sJ(2460) is mixed with the
j=3/2 state, and whether the four-quark interpretation is viable.


title: A Common Origin for all CP Violations

abstract:
  We put forward the conjecture that all CP violating phenomena may have a
common origin. In order to illustrate our idea, we present a minimal model
where CP is spontaneously broken at a high energy scale, through the phase in
the vacuum expectation value of a complex scalar singlet. This single phase is
the origin of both low energy CP violation in the quark and leptonic sectors,
as well as leptogenesis. We also show that in this framework the strong CP
problem may be solved in a simple way through the introduction of a Z_4
symmetry which allows for the implementation of the Nelson-Barr mechanism.


title: Effects of Electroweak Instantons In High-Energy Neutrino Telescopes

abstract:
  We demonstrate that next generation high-energy neutrino telescopes may
reveal the existence of interactions induced by standard model electroweak
instantons. The energy spectrum, the angular distribution, and the quark and
lepton multiplicity of events in the detector each provide signatures which can
indicate the presence of these interactions. High-energy neutrino telescopes
may be capable of searching for signals at energies far beyond the reach of the
next generation colliders.


title: Leptoproduction of nucleons in the cumulative region

abstract:
  Leptoproduction of nucleons into the backward hemisphere on nuclear targets
is studied at relativistic subasymptotic energies and momenta. The relativistic
internucleon potential is extracted from appropriate photoproduction data.
Different production mechanisms are found to work together and interfere.
Whenever rescattering is kinematically possible, it gives the bulk of the
contribution, except at very high Q^2. Comparison with the existing data at
E=2.4 GeV shows a reasonable agreement.


title: Two-loop renormalization of the electric charge in the Standard Model

abstract:
  We discuss the renormalization of the electric charge at the two-loop level
in the Standard Model of the electroweak interactions. We explicitly calculate
the expression of the complete on-shell two-loop counterterm using the
Background Field Method and discuss the advantages of this computational
approach. We consider the related quantity $\hat e(\mu)$, defined in the $\ms$
renormalization scheme and present numerical results for different values of
the scale $\mu$. We find that the full 2-loop electroweak corrections
contribute more than 10 parts in units $10^{-5}$ to the $\Delta \hat\alpha
(\mz^2)$ parameter, obtaining $\hat\alpha^{-1}(\mz)= 128.12 \pm 0.05$ for
$\Delta\alpha_{had}(\mz^2) =0.027572 \pm 0.000359$.


title: Twenty Years of SUGRA

abstract:
  A brief review is given of the developments of mSUGRA and its extensions
since the formulation of these models in 1982. Future directions and prospects
are also discussed.


title: Supergravity from the Weakly Coupled Heterotic String

abstract:
  The weakly coupled vacuum of E_8 x E_8 heterotic string theory remains a
promising candidate for the underlying theory of the Standard Model. The
particle spectrum and the issue of dilaton stabilization are reviewed. Specific
models for hidden sector condensation and supersymmetry breaking are described
and their phenomenological and cosmological implications are discussed.


title: Color Superconductivity in a Dense Quark Matter

abstract:
  The color superconductivity of a dense quark matter is reviewed with emphasis
on the long range nature of the pairing force and the multiplicity of the order
parameter. The former gives rise to a non BCS behavior of the superconducting
energy scale and the latter modifies the critical value of the Ginzburg-Landau
parameter that separates the superconductivity of type I and that of type II.


title: Lepton flavor violating Z-decays in supersymmetric see-saw model

abstract:
  In supersymmetric see-saw model, the large flavor mixings of sleptons induce
the lepton flavor violating (LFV) interactions $\ell_I \bar\ell_J V$
($V=\gamma, Z$), which give rise to various LFV processes. In this work we
examine the induced LFV decays $Z\to\ell_I \bar\ell_J$. Subject to the
constraints from the existing neutrino oscillation data and the experimental
bounds on the decays $\ell_J\to\ell_I\gamma$, these LFV $Z$-decays are found to
be sizable, among which the largest-rate channel $Z\to \tau \bar{\mu}$ can
ocuur with a branching ratio of $10^{-8}$ and may be accessible at the LHC or
GiagZ experiment.


title: CPT Tests: Kaon vs Neutrinos

abstract:
  CPT violation has an impressive limit in the neutral kaon system |m(K^0) -
m(\bar{K}^0)| < 10^{-18} m_K = 0.50 \times 10^{-18} GeV. However, if viewed as
a constraint on the mass-squared, the bound appears weak, |m^2(K^0) -
m^2(\bar{K}^0)| < 0.25 eV^2. We point out that neutrino oscillation offers
better limits on CPT violation in this case. The comparison of solar and rector
neutrino results puts the best limit on CPT violation by far, |\Delta m^2_\nu -
\Delta m^2_{\bar{\nu}}| < 1.3 \times 10^{-3} eV^2 (90% CL).


title:
Running coupling effects for the singlet structure function g_1 at small
  x

abstract:
  The running of the QCD coupling is incorporated into the infrared evolution
equations for the flavour structure function g_1. The explicit expressions for
g_1 including the total resummation of the double-logarithmic contributions and
accounting for the running coupling are obtained. We predict that
asymptotically g_1 ~ x^{- \Delta_S}, with the intercept \Delta_S = 0.86, which
is more than twice larger than the non-singlet intercept. The impact of the
initial quark (\delta q) and gluon (\delta g) densities on the sign of g_1 at x
<< 1 is discussed and explicit expressions relating \delta q and \delta g are
obtained.


title:
Nuclear charm and bottom production: a comparison among high energy
  approaches

abstract:
  We calculate the nucleon and nuclear photoproduction cross sections for heavy
quarks within the $k_{\perp}$-factorization formalism, considering the current
high energy approaches which include nuclear and saturation effects. Our
results demonstrate that a future experimental analysis of this process would
allow to constraint the QCD dynamics at high energies.


title:
Effective Description of a Gauge Field and a Tower of Massive Vector
  Resonances

abstract:
  In this work we review an effective description of the interaction of a gauge
field with a tower of massive vector fields by introducing a non-diagonal mass
matrix in a gauge invariant way. Particular cases of the method with only one
vector resonance have been used by the author elsewhere, nevertheless in this
paper the method is developed in a general way and and we proof its main
features for an arbitrary number of vector resonances. Additionally, we show
how to couple the vector resonances with fermions. We find that the method can
be useful in order to describe the low energy phenomenology of scenarios like
Kaluza-Klein resonances of usual gauge bosons or Technicolor vector resonances
and detailed examples are provided.


title: Ground-state baryons in nonperturbative quark dynamics

abstract:
  We review the results obtained in an Effective Hamiltonian (EH) approach for
the three-quark systems. The EH is derived starting from the Feynman--Schwinger
representation for the gauge-invariant Green function of the three quarks
propagating in the nonperturbative QCD vacuum and assuming the minimal area law
for the asymptotic of the Wilson loop. It furnishes the QCD consistent
framework within which to study baryons. The EH has the form of the
nonrelativistic three-quark Hamiltonian with the perturbative Coulomb-like and
nonperturbative string interactions and the specific mass term. After outlining
the approach, methods of calculations of the baryon eigenenergies and some
simple applications are explained in details. With only two parameters: the
string tension $\sigma=0.15 GeV^2$ and the strong coupling constant
$\alpha_s=0.39$ a unified quantitative description of the ground state light
and heavy baryons is achieved. The prediction of masses of the doubly heavy
baryons not discovered yet are also given. In particular, a mass of $3660 MeV$
for the lightest $\Xi_{cc}$ baryon is found by employing the hyperspherical
formalism to the three quark confining potential with the string junction.


title:
O(alpha) electroweak corrections to the processes e+e- -> tau-tau+, c
  bar-c, b bar-b, t bar-t: a comparison

abstract:
  We present the electroweak one-loop corrections to the processes e+e- -> f
bar-f, f = tau, c, b, t, at energies relevant for a future linear collider. The
results of two independent calculations are compared and agreement is found at
a technical-precision level of ten to twelve digits.


title: On heavy-light meson resonances and chiral symmetry

abstract:
  We study heavy-light meson resonances with quantum numbers J^P=0^+ and
J^P=1^+ in terms of the non-linear chiral SU(3) Lagrangian. At leading order a
parameter-free prediction is obtained for the scattering of Goldstone bosons
off heavy-light pseudo-scalar and vector mesons once we insist on approximate
crossing symmetry of the unitarized scattering amplitude. The recently
announced narrow open charm states observed by the BABAR and CLEO
collaborations are reproduced. We suggest the existence of states that form an
anti-triplet and a sextet representation of the SU(3) group. In particular, so
far unobserved narrow isospin-singlet states with negative strangeness
(I,S)=(0,-1) are predicted at 2361 MeV J^P=0^+ and 2501 MeV (J^P=1^+).
Similarly, open bottom states are found at 5719 MeV (J^P=0^+) and 5622 MeV
(J^P=1^+). Additional narrow states of mass 5580 MeV (J^P=0^+) and 5650 MeV
(J^P=1^+) with widths of about 50 MeV are obtained in the (I,S)=(1,1) sector.
For the anti-triplet states our results differ most significantly from
predictions that are based on a linear realization of the chiral SU(3) symmetry
in the open bottom sector. Strongly bound 0^+-and 1^+-states with (I,S)=(0,1)
at 5507 MeV and 5553 MeV are predicted.


title: Time delayed K+ N reactions and exotic baryon resonances

abstract:
  Evidences and hints, both from the theoretical and experimental side, of
exotic baryon resonances with B=S, have been with us for the last thirty years.
The poor status of the general acceptance of these Z* resonances is partly due
to the prejudice against penta-quark baryons and partly due to the opinion that
a proof of the existence of exotic states must be rigorous. This can refer to
the quality and amount of data gathered, and also to the analytical methods
applied in the study of these resonances. It seems then mandatory that all
possibilities and aspects be exploited. We do that by analyzing the time delay
in K+ N scattering, encountering clear signals of the exotic Z* resonances
close to the pole values found in partial wave analyses.


title: Magnetic Moments of Baryons with a Heavy Quark

abstract:
  We compute magnetic moments of baryons with a heavy quark in the bound state
approach for heavy baryons. In this approach the heavy baryon is considered as
a heavy meson bound to a light baryon. The latter is represented as a soliton
excitation of light meson fields. We obtain the magnetic moments by sandwiching
pertinent components of the electromagnetic current operator between the bound
state wave--functions. We extract this current operator from the coupling to
the photon field after extending the action to be gauge invariant.


title: Target Mass Effects in Polarized Virtual Photon Structure Functions

abstract:
  We study target mass effects in the polarized virtual photon structure
functions $g_1^\gamma (x,Q^2,P^2)$, $g_2^\gamma (x,Q^2,P^2)$ in the kinematic
region $\Lambda^2\ll P^2 \ll Q^2$, where $-Q^2 (-P^2)$ is the mass squared of
the probe (target) photon. We obtain the expressions for $g_1^\gamma
(x,Q^2,P^2)$ and $g_2^\gamma (x,Q^2,P^2)$ in closed form by inverting the
Nachtmann moments for the twist-2 and twist-3 operators. Numerical analysis
shows that target mass effects appear at large $x$ and become sizable near
$x_{\rm max}(=1/(1+\frac{P^2}{Q^2}))$, the maximal value of $x$, as the ratio
$P^2/Q^2$ increases. Target mass effects for the sum rules of $g_1^\gamma$ and
$g_2^\gamma$ are also discussed.


title: Recent results on charm from E831-FOCUS

abstract:
  E831-FOCUS is a photoproduction experiment which collected data during the
1996/1997 fixed target run at Fermilab. More than 1 million charm particles
have been reconstructed. Using this sample we measure the lifetimes of all the
weakly decaying singly charmed particles, establishing the charm lifetime
hierachy. Then we present recent results on semileptonic decays of charm
mesons, including the new s-wave inteference phenomena in D+ to K-pi+mu+nu, and
high statistics branching ratio and form factor measurements.


title: The Origin of Mass

abstract:
  The quark-lepton mass problem and the ideas of mass protection are reviewed.
The hierarchy problem and suggestions for its resolution, including Little
Higgs models, are discussed. The Multiple Point Principle is introduced and
used within the Standard Model to predict the top quark and Higgs particle
masses. Mass matrix ans\"{a}tze are considered; in particular we discuss the
lightest family mass generation model, in which all the quark mixing angles are
successfully expressed in terms of simple expressions involving quark mass
ratios. It is argued that an underlying chiral flavour symmetry is responsible
for the hierarchical texture of the fermion mass matrices. The phenomenology of
neutrino mass matrices is briefly discussed.


title: A mechanism for the T-odd pion fragmentation function

abstract:
  We consider a simple rescattering mechanism to calculate a leading twist
$T$-odd pion fragmentation function, a favored candidate for filtering the
transversity properties of the nucleon. We evaluate the single spin azimuthal
asymmetry for a transversely polarized target in semi-inclusive deep inelastic
scattering (for HERMES kinematics). Additionally, we calculate the double
$T$-odd $\cos2\phi$ asymmetry in this framework.


title: Do many-particle neutrino interactions cause a novel coherent effect?

abstract:
  We investigate whether coherent flavor conversion of neutrinos in a neutrino
background is substantially modified by many-body effects, with respect to the
conventional one-particle effective description. We study the evolution of a
system of interacting neutrino plane waves in a box. Using its equivalence to a
system of spins, we determine the character of its behavior completely
analytically. We find that, if the neutrinos are initially in flavor
eigenstates, no coherent flavor conversion is realized, in agreement with the
effective one-particle description. This result does not depend on the size of
the neutrino wavepackets and therefore has a general character. The validity of
the several important applications of the one-particle formalism is thus
confirmed.


title: Scattering Amplitudes in High Energy QCD

abstract:
  We develop a new systematic procedure for the Regge limit in perturbative QCD
to arbitrary logarithmic order. The formalism relies on the IR structure and
the gauge symmetry of the theory. We identify leading regions in loop momentum
space responsible for the singular structure of the amplitudes and perform
power counting to determine the strength of these divergences. Using a
factorization procedure introduced by Sen, we derive a sum of convolutions in
transverse momentum space over soft and jet functions, which approximate the
amplitude up to power-suppressed corrections. A set of evolution equations
generalizing the BFKL equation and controlling the high energy behavior of the
amplitudes to arbitrary logarithmic accuracy is derived. The general method is
illustrated in the case of leading logarithmic gluon reggeization and BFKL
equation.


title:
On Exclusive and Inclusive Rare B Decays: CKM Phenomenology and New
  Physics Reach

abstract:
  We report recent results in rare B decays. Our focus will be on b -> d gamma
and b -> s l^+ l^- transitions. We discuss their impact on the CKM
phenomenology and their role within our search for new physics. In particular,
we analyse the impact of a recent lattice QCD estimate of the B -> K* form
factor at zero recoil. We also briefly discuss the presently available optimal
theoretical tools for the inclusive and exclusive modes.


title: The "Right" Sneutrino as the LSP

abstract:
  It is shown that "right" sneutrino can be the lightest supersymmetric
particle. Clearly, this possibility will drastically change decay chains of
SUSY particles. The sneutrino production at next linear colliders has been
analyzed in this scenario.


title:
Higgs Boson Flavor-Changing Neutral Decays into Top Quark in a General
  Two-Higgs-Doublet Model

abstract:
  Higgs boson decays mediated by flavor changing neutral currents (FCNC) are
very much suppressed in the Standard Model, at the level of 10^{-15} for Higgs
boson masses of a few hundred GeV. Therefore, any experimental vestige of them
would immediately call for new physics. In this paper we consider the FCNC
decays of Higgs bosons into a top quark in a general two-Higgs-doublet model
(2HDM). The isolated top quark signature, unbalanced by any other heavy
particle, should help to identify the potential FCNC events much more than any
other final state. We compute the maximum branching ratios and the number of
FCNC Higgs boson decay events at the LHC collider at CERN. The most favorable
mode for production and subsequent FCNC decay is the lightest CP-even state in
the Type II 2HDM, followed by the other CP-even state, if it is not very heavy,
whereas the CP-odd mode can never be sufficiently enhanced. Our calculation
shows that the branching ratios of the CP-even states may reach 10^{-5}, and
that several hundred events could be collected in the highest luminosity runs
of the LHC. We also point out some strategies to use these FCNC decays as a
handle to discriminate between 2HDM and supersymmetric Higgs bosons.


title: Two-loop and n-loop eikonal vertex corrections

abstract:
  I present calculations of two-loop vertex corrections with massive and
massless partons in the eikonal approximation. I show that the $n$-loop result
for the UV poles can be given in terms of the one-loop calculation.


title: The MC@NLO 2.0 Event Generator

abstract:
  This is the user's manual of MC@NLO 2.0. This package is a practical
implementation, based upon the HERWIG event generator, of the MC@NLO formalism,
which allows one to incorporate NLO QCD matrix elements consistently into a
parton shower framework. The processes available in this version are those of
vector boson pair and heavy quark pair production in hadron collisions. This
document is self-contained, but we emphasise the main differences with respect
to version 1.0.


title:
The upper bound of the lightest Higgs boson in a supersymmetric $SU(3)_L
  \otimes U(1)_X$ gauge model

abstract:
  A supersymmetric version of the $SU(3)_L \otimes U(1)_X$ gauge model is
presented. The model is embedded in a $SU(6)_L \otimes U(1)_X$ gauge group and
it has been built up completely quiral anomaly free and without any exotic
charges in the fermionic content. The Minimal Supersymmetric Standard Model can
be seen as an effective theory of this larger symmetry. We analyze how the
spectrum of the new model can shift the upper bound on the CP-even Higgs boson
and we find that it can be moved up to 143 GeV.


title: Dark Energy and Neutrino Mass Limits from Baryogenesis

abstract:
  In this brief report we consider couplings of the dark energy scalar, such as
Quintessence to the neutrinos and discuss its implications in studies on the
neutrino mass limits from Baryogenesis. During the evolution of the dark energy
scalar, the neutrino masses vary, consequently the bounds on the neutrino
masses we have here differ from those obtained before.


title: Neutrino Physics - Theory

abstract:
  We discuss recent developments in neutrino physics and focus, in particular,
on neutrino oscillations and matter effects of three light active neutrinos.
Moreover, we discuss the difference between Dirac and Majorana neutrinos,
neutrinoless $\beta\beta$-decay, absolute neutrino masses and electromagnetic
moments. Basic mechanisms and a few models for neutrino masses and mixing are
also presented.


title: Generalized parton distributions and composite constituent quarks

abstract:
  An approach is proposed to calculate Generalized Parton Distributions (GPDs)
in a Constituent Quark Model (CQM) scenario, considering the constituent quarks
as complex systems. The GPDs are obtained from the wave functions of the non
relativistic CQM of Isgur and Karl, convoluted with the GPDs of the constituent
quarks themselves. The latter are modelled by using the structure functions of
the constituent quark, the double distribution representation of GPDs, and a
recently proposed phenomenological constituent quark form factor. The present
approach permits to access a kinematical range corresponding to both the DGLAP
and the ERBL regions, for small values of the momentum transfer and of the
skewedness parameter. In this kinematical region, the cross sections relevant
to deeply virtual Compton scattering could be estimated by using the obtained
GPDs. As an example, the leading twist, unpolarized GPD $H$ has been
calculated. Its general relations with the non relativistic definition of the
electric form factor and with the leading twist unpolarized quark density are
consistently recovered from our expressions.Further natural applications of the
proposed approach are addressed.


title: Pseudo-Dirac Neutrinos, a Challenge for Neutrino Telescopes

abstract:
  Neutrinos may be pseudo-Dirac states, such that each generation is actually
composed of two maximally-mixed Majorana neutrinos separated by a tiny mass
difference. The usual active neutrino oscillation phenomenology would be
unaltered if the pseudo-Dirac splittings are $\delta m^2 \alt 10^{-12}$ eV$^2$;
in addition, neutrinoless double beta decay would be highly suppressed.
However, it may be possible to distinguish pseudo-Dirac from Dirac neutrinos
using high-energy astrophysical neutrinos. By measuring flavor ratios as a
function of $L/E$, mass-squared differences down to $\delta m^2 \sim 10^{-18}$
eV$^2$ can be reached. We comment on the possibility of probing cosmological
parameters with neutrinos.


title: B^0 -> phi K_S in SUGRA models with CP violations

abstract:
  We examine the B -> phi K decays within the framework of SUGRA models making
use of the improved QCD factorization method of Beneke et al. which allows
calculations of non-factorizable contributions. All other experimental
constraints (B -> X_S gamma, neutron and electron electric dipole moments, dark
matter constraints, etc.) are imposed. We calculate the CP violating parameters
S_{phi K_S}, C_{phi K_S} and A_{phi K^{-+}} as well as the branching ratios
(BR) of B^0 and B^{+-}, Br[B -> phi K]. We find for the Standard Model(SM) and
mSUGRA it is not possible to account for the observed 2.7 sigma deviation
between S_{phi K_S} and S_{J/Psi K_S}. In general the BRs are also in 3 sigma
disagreement with experiment, except in the parameter region where the weak
annihilation terms dominate the decay (and hence where the theory is least
reliable). Thus if future data confirm the current numbers, this would
represent the first significant breakdown of both the SM and mSUGRA. We show
then that adding a SUGRA non-universal A soft breaking left-right term mixing
the second and third generations in either the down or up quark sector, all
data can be accommodated for a wide range of parameters. The full 6x6 quark
mass matrices are used and the SUSY contributions calculated without
approximation.


title: Observational Critical QCD

abstract:
  A detailed study of correlated scalars, produced in collisions of nuclei and
associated with the $\sigma$-field fluctuations, $(\delta \sigma)^2= < \sigma^2
>$, at the QCD critical point (critical fluctuations), is performed on the
basis of a critical event generator (Critical Monte-Carlo) developed in our
previous work. The aim of this analysis is to reveal suitable observables of
critical QCD in the multiparticle environment of simulated events and select
appropriate signatures of the critical point, associated with new and strong
effects in nuclear collisions.


title: Measurement of gamma at B Factories Using Inclusive D Decays

abstract:
  We discuss the determination of the CKM phase gamma through the decay B- ->
K- D0 and related processes. In particular, we consider the use of this methods
when the D0 subsequently decays to an inclusive state. We emphasize that strong
phase information obtained at a psi(3770) charm factory can provide additional
information which will be helpful in determining gamma.


title: Some remarks on neutrino oscillation and masses

abstract:
  We discuss an Ansatz for the neutrino mixing matrix and speculate on the form
and origin of the neutrino mass matrix.


title: Colored flux tube in the Euclidean spacetime

abstract:
  The flux tube solution in the Euclidean spacetime with the color longitudinal
electric field in the SU(2) Yang - Mills - Higgs theory with broken gauge
symmetry is found. Some arguments is given that this flux tube is a pure
quantum object in the SU(3) quantum theory reduced to the SU(2) Yang - Mills -
Higgs theory.


title: Btev: Strategy and Sensitivity

abstract:
  The next-generation experiments on Heavy Flavour Physics must be performed at
the hadron colliders to exploit the superior production cross-section and
availability of all the species of b and c flavored hadrons. The particularly
hostile environment of the hadron colliders, on the other hand, requires that
new and adequate experimental tecniques be developed to face this extraordinary
challenge. The BTeV experiment has developed the right experimental tools to
perform this program with very high sensitivity and to extend our knowledge at
the frontier of New Physics.


title: Inclusive Vub measurements at BaBar

abstract:
  We present two inclusive measurements of Cabibbo-Kobayashi-Maskawa (CKM)
matrix element Vub: one uses the lepton energy spectrum (E_l) and the other
uses the invariant mass of the hadronic system (m_X) to discriminate signal (B
-> X_u lnu) and background (B -> X_c lnu) events in B -> Xlnu transitions. Both
analyses are based on data samples collected by the BaBar detector at the
PEP-II asymmetric-energy B Factory at SLAC.


title: The $\sqrt{m\Lambda_{QCD}$ scale in heavy quarkonium

abstract:
  We investigate the effects produced by the three-momentum scale
$\sqrt{m\Lambda_{QCD}}$ in the strong coupling regime of heavy quarkonium. We
compute the leading non-vanishing contributions due to this scale to the masses
and inclusive decay widths. We find that they may provide leading corrections
to the S-wave decay widths but only subleading corrections to the masses.


title:
Longitudinal structure function of the proton at low momentum transfer
  and extended constituents

abstract:
  Recent data on the (inelastic) Nachtmann moments of the unpolarized proton
structure function F2p, obtained at low momentum transfer with the CLAS
detector at Jefferson Lab, have been interpreted in terms of the dominance of
the elastic coupling of the virtual photon with extended substructures inside
the proton. Adopting the same constituent form factors and the same light-front
wave function describing the motion of the constituents in the proton, the
(inelastic) Nachtmann moments of the longitudinal proton structure function FLp
are calculated (without further parameters) for values of the squared
four-momentum transfer 0.2 < Q**2 (GeV/c)**2 < 2. The different role played by
the Pauli form factor of the constituents in the transverse and longitudinal
channels is illustrated. Our predictions, including an estimate of the
theoretical uncertainties, may be checked against the forthcoming results of
the experiment E94110 at Jefferson Lab. A positive comparison with the new data
may provide compelling evidence that constituent quarks are intermediate
substructures between the hadrons and the current quarks and gluons of QCD.


title: Tests of Lorentz and CPT Invariance in Space

abstract:
  I give a brief overview of recent work concerning possible signals of Lorentz
violation in sensitive clock-based experiments in space. The systems under
consideration include atomic clocks and electromagnetic resonators of the type
planned for flight on the International Space Station.


title:
Prediction of Neutron Elastic Form Factors Using GPDs from Proton
  Elastic Form Factors and Isospin Symmetry

abstract:
  The elastic neutron form factors $G_{En}$ and $G_{Mn}$ are calculated in a
GPD framework using GPDs obtained from fits to proton elastic form factors
$G_{Ep}$ and $G_{Mp}$, and isospin symmetry, with no further changes in
parameters. The results for $G_{En}$ are in good agreement with existing data,
while those for $G_{Mn}$ are fair. The calculations predict the form factors
for future measurements at higher $Q^2$.


title:
Lepton Electric Dipole Moments, Supersymmetric Seesaw and Leptogenesis
  Phase

abstract:
  We calculate the lepton electric dipole moments in a class of supersymmetric
seesaw models and explore the possibility that they may provide a way to probe
some of the CP violating phases responsible for the origin of matter via
leptogenesis. We show that in models where the right handed neutrino masses,
$M_R$ arise from the breaking of local B-L symmetry by a Higgs field with
B-L=2, some of the leptogenesis phases can lead to enhancement of the lepton
dipole moments compared to the prediction of models where $M_R$ is either
directly put in by hand or is a consequence of a higher dimensional operator.


title: Anomalous decay of pion and eta at finite density

abstract:
  We study the anomalous decays $\pi^0, \eta \to\gamma\gamma$ in the framework
of the three--flavor Nambu--Jona-Lasinio [NJL] model, in the vacuum and in
quark matter in $\beta$ --equilibrium. It is found that the behavior of the
relevant observables essentially reflects a manifestation of the partial
restoration of chiral symmetry, in non strange and strange sectors. The
probability of such decays decreases with density, showing that anomalous
mesonic interactions are significantly affected by the medium.


title: Performance and First Physics Results of the SVT Trigger at CDF II

abstract:
  For the first time in a hadron collider, a novel trigger processor, the
Silicon Vertex Trigger (SVT), allows to select the long-lived heavy flavor
particles by cutting on the track impact parameter with a precision similar to
that of the offline reconstruction. Triggering on displaced tracks has enriched
the B-physics program by enhancing the B yields of the lepton-based triggers
and opened up full hadronic triggering at CDF. After a first commissioning
period, the SVT is fully operational, performing very closely to its design
capabilities. System performance and first physics results based on SVT
selected data samples are presented.


title: On the analysis of the pi -> e nu gamma experimental data

abstract:
  The most general amplitude for the radiative pion decay pi -> e nu gamma
including terms beyond V-A theory is considered. The experimental constraints
on the decay amplitude components are discussed. A model independent
presentation of the results of high statistics and high resolution experiments
is suggested.


title: Neutrino oscillations under gravity: mass independent oscillation

abstract:
  I discuss the possibility of neutrino oscillation in presence of gravity. In
this respect I consider the propagation of neutrinos in the early phase of
universe and around black holes. It is seen that whether the rest masses of a
neutrino and corresponding anti-neutrino are considered to be same or not due
to space-time curvature effect non-zero oscillation probability between the
neutrino and anti-neutrino states comes out. Therefore I can conclude that
under gravity neutrino oscillation takes place which is independent of their
rest mass.


title: Hadronic B Decays Involving Even Parity Charmed Mesons

abstract:
  Hadronic B decays containing an parity-even charmed meson in the final state
are studied. Specifically we focus on the Cabibbo-allowed decays $\bar B\to
D^{**} \pi(\rho), D^{**}\bar D_s^{(*)}, \bar D^{**}_sD^{(*)}$ and $\bar B_s\to
D_s^{**}\pi(\rho)$, where $D^{**}$ denotes generically a p-wave charmed meson.
The $B\to D^{**}$ transition form factors are studied in the improved version
of the Isgur-Scora-Grinstein-Wise quark model. We apply heavy quark effective
theory and chiral symmetry to study the strong decays of p-wave charmed mesons
and determine the magnitude of the $D_1^{1/2}-D_1^{3/2}$ mixing angle. Except
the decay to $D_1(2427)^0\pi^-$ the predictions for $B^-\to D^{**0}\pi^-$ agree
with experiment. The sign of $D_1^{1/2}-D_1^{3/2}$ mixing angle is found to be
positive in order to avoid a severe suppression on the production of
$D_1(2427)^0\pi^-$. The interference between color-allowed and color-suppressed
tree amplitudes is expected to be destructive in the decay $B^-\to
D_1(2427)^0\pi^-$. Hence, an observation of the ratio
$D_1(2427)^0\pi^-/D_1(2427)^+\pi^-$ can be used to test the relative signs of
various form factors as implied by heavy quark symmetry. Although the predicted
$B^-\to D_1(2420)^0\rho^-$ at the level of $3\times 10^{-3}$ exceeds the
present upper limit, it leads to the ratio
$D_1(2420)\rho^-/D_1(2420)\pi^-\approx 2.6$ as expected from the factorization
approach and from the ratio $f_\rho/f_\pi\approx 1.6$ . Therefore, it is
crucial to have a measurement of this mode to test the factorization
hypothesis. For $\bar B\to \bar D_s^{**}D$ decays, it is expected that $\bar
D_{s0}^*D\gsim \bar D_{s1}D$ as the decay constants of the multiplet
$(D_{s0}^*,D_{s1})$ become the same in the heavy quark limit.


title:
Decaying neutrinos and implications from the supernova relic neutrino
  observation

abstract:
  We propose that supernova relic neutrino (SRN) observation can be used to set
constraints on the neutrino decay models. Because of the long distance scale
from cosmological supernovae to the Earth, SRN have possibility to provide much
stronger limit than the present one obtained from solar neutrino observation.
Since the currently available data are only the upper limit on the flux
integrated over $E_{\bar\nu_e}>19.3$ MeV, the decay models on which we can set
constraints is quite restricted; they must satisfy specific conditions such
that the daughter neutrinos are active species, the neutrino mass spectrum is
quasi-degenerate, and the neutrino mass hierarchy is normal. Our numerical
calculation clearly indicates that the neutrino decay model with
$(\tau_2/m,\tau_3/m)\alt (10^{10},10^{10})$ [s/eV], where $\tau_i$ represents
the lifetime of mass eigenstates $\bar\nu_i$, appears to give the SRN flux that
is larger than the current upper limit. However, since the theoretical SRN
prediction contains many uncertainties concerning a supernova rate in the
universe or simulation of supernova explosions, we cannot conclude that there
exists the excluded parameter region of the neutrino lifetime. In the near
future, further reduced upper limit is actually expected, and it will provide
more severe constraints on the neutrino decay models.


title: Group theory and the Pentaquark

abstract:
  The group classification of exotic pentaquarks involving four standard quarks
and a single antiquark to produce pentaquarks of strangeness +1 is outlined.


title: Subleading collinear operators and their matrix elements

abstract:
  We discuss the most general form of the leading power suppressed collinear
operators in the soft-collinear effective theory. Such operators appear in the
description of power corrections to exclusive heavy flavor decays into
energetic light hadrons. Reparametrization invariance in the SCET provides
powerful constraints on the Wilson coefficients of the subleading collinear
operators. We present explicit results for the matrix elements of these
operators on pseudoscalar and vector mesons, which are expressed in terms of
twist-2 and twist-3 light-cone wave functions. We consistently include the
effects of three-particle light-cone distribution amplitudes and find that
their impact could be of phenomenological relevance.


title: Is the Zee model neutrino mass matrix ruled out?

abstract:
  A very economic model of generating small neutrino masses is the Zee model.
This model has been studied extensively in the literature with most of the
studies concentrated on the simplest version of the model where all diagonal
entries in the mass matrix are zero. SNO, and KamLAND data disfavor this simple
version, but only when one also combines information from atmospheric and K2K
data, can one rule out this model with high confidence level. We show that the
simplest version of Zee model is ruled out at $3\sigma$ level. The original Zee
model, however, contains more than enough freedom to satisfy constraints from
data. We propose a new form of mass matrix by naturalness consideration. This
new form of mass matrix predicts that $m_{\nu_3} = 0$, and
$\tan^2\theta_{solar}$ increases with $|V_{e3}|$. For the best fit value of
$\tan^2\theta_{solar}$, $|V_{e3}|$ is sizeable but below the upper bound.


title: Neutrino Masses and Beyond from Supersymmetry

abstract:
  A generic form of the supersymmetric SM naturally gives rise to the lepton
number violating neutrino masses and mixings, without the need for extra
superfields beyond the minimal spectrum. Hence, SUSY can be consider the origin
of beyond SM properties of neutrinos. We have developed a formulation under
which one can efficiently analyze the model. Various sources of neutrino masses
are discussed in details. Such mass contributions come from lepton number and
flavor violating couplings that also give rise to a rich phenomenology of the
neutrinos and other leptons, to be discussed.


title: Hard-soft Pomeron transition from QCD saturation in the dipole picture

abstract:
  We pose the question: how far can we push the QCD dipole model and the idea
of QCD saturation to the kinematical regions traditionally associated with soft
nonperturbative physics? The answer is that it works sufficiently well allowing
a smooth transition from hard (BFKL) pomeron to the soft one.


title:
Measurement of the Higgs-boson CP properties using decays into WW and ZZ
  at the Photon Collider

abstract:
  Higgs-boson production at the Photon Collider at TESLA is studied for masses
from 180 to 350 GeV, using realistic luminosity spectra and detector
simulation. Parity of the SM Higgs-boson can be verified from the measurement
of the interference effects in the W+ W- decay channel and of the angular
correlations in the decays of W+ W- and ZZ pairs. SM-like Two Higgs Doublet
Model (2HDM II) and model with the generic higgs couplings are considered.


title: Indirect signals of quark singlets at colliders

abstract:
  In this talk we review some of the most relevant effects that the mixing with
a Q=2/3 quark singlet might give at high energy colliders and K and B
factories.


title: The MSSM in the Light of Precision Data

abstract:
  The potential of present and anticipated future electroweak precision data,
including the Higgs boson and top quark masses, for testing quantum effects of
the electroweak theory is investigated in the context of the Minimal
Supersymmetric Standard Model (MSSM). The present status of the theoretical
predictions is analyzed. The impact of the parametric uncertainties from the
experimental errors of the input parameters is studied, and an estimate for the
remaining uncertainties from unknown higher-order corrections is given both in
the Standard Model (SM) and the MSSM. Examples of electroweak precision tests
in the mSUGRA scenario and the unconstrained MSSM are analyzed, and the status
of the global fit to all data is discussed.


title:
The role of matter density uncertainties in the analysis of future
  neutrino factory experiments

abstract:
  Matter density uncertainties can affect the measurements of the neutrino
oscillation parameters at future neutrino factory experiments, such as the
measurements of the mixing parameters $\theta_{13}$ and $\deltacp$. We compare
different matter density uncertainty models and discuss the possibility to
include the matter density uncertainties in a complete statistical analysis.
Furthermore, we systematically study in which measurements and where in the
parameter space matter density uncertainties are most relevant. We illustrate
this discussion with examples that show the effects as functions of different
magnitudes of the matter density uncertainties. We find that matter density
uncertainties are especially relevant for large $\stheta \gtrsim 10^{-3}$.
Within the KamLAND-allowed range, they are most relevant for the precision
measurements of $\stheta$ and $\deltacp$, but less relevant for ``binary''
measurements, such as for the sign of $\ldm$, the sensitivity to $\stheta$, or
the sensitivity to maximal CP violation. In addition, we demonstrate that
knowing the matter density along a specific baseline better than to about 1%
precision means that all measurements will become almost independent of the
matter density uncertainties.


title: Energy Dependence of the Cronin Effect from Non-Linear QCD Evolution

abstract:
  The non-linear evolution of dense partonic systems has been suggested as one
of the novel physics mechanisms relevant to the dynamics of hadron-nucleus and
nucleus-nucleus collisions at collider energies. Here we study to what extent
the description of Cronin enhancement in the framework of this non-linear
evolution is consistent with the recent observation in 200 AGeV d--Au
collisions at the Relativistic Heavy Ion Collider. We solve the
Balitsky-Kovchegov evolution equation numerically for several initial
conditions encoding Cronin enhancement. We find that the properly normalized
nuclear gluon distribution is suppressed at all momenta relative to that of a
single nucleon. Calculating the resulting spectrum of produced gluons in p-A
and A-A collisions, we establish that the nonlinear QCD evolution is unable to
generate a Cronin type enhancement, and that it quickly erases any such
enhancement which may be present at lower energies.


title:
Measurement of the MSSM Higgs-bosons production in gamma gamma -> A,H ->
  b bbar at the Photon Collider at TESLA

abstract:
  Results from a realistic simulation of the heavy MSSM Higgs-bosons A and H
production, gamma gamma -> A,H -> b bbar, at the Photon Collider at TESLA are
reported. In the scenario where a light SM-like Higgs boson h exists, we study
(following M. Muehlleitner et al.) Higgs bosons A and H for masses
M_A=200,250,300,350 GeV and tan(beta)=7. This scenario corresponds to
parameters region not accessible at LHC or at the first stage of the e^+ e^-
collider. NLO estimation of background, analysis of overlaying events,
realistic b-tagging and corrections for escaping neutrinos were performed. The
statistical precision of the cross-section measurement is estimated to be
8-20%.


title: Gauge Couplings at High Temperature and the Relic Gravitino Abundance

abstract:
  In higher-dimensional supersymmetric theories gauge couplings of the
effective four-dimensional theory are determined by expectation values of
scalar fields. We find that at temperatures above a critical temperature $T_*$,
which depends on the supersymmetry breaking mass scales, gauge couplings
decrease like $T^{-\a}$, $\a > 1$. This has important cosmological
consequences. In particular it leads to a relic gravitino density which becomes
independent of the reheating temperature for $T_R > T_*$. For small gravitino
masses, $m_{3/2} \ll m_{\gl}$, the mass density of stable gravitinos is
essentially determined by the gluino mass. The observed value of cold dark
matter, $\O_{\rm CDM}h^2 \sim 0.1$, is obtained for gluino masses $m_{\gl} =
{\cal O}(1 {\rm TeV})$.


title: Tau-Mu Flavor Violation and the Scale of New Physics

abstract:
  Motivated by the strong experimental evidence of large nu_mu - nu_tau
neutrino oscillations, we study existing constraints for related mu - tau
flavor violation. Using a general bottom-up approach, we construct dimension-6
effective fermionic operators whose coefficients encode the scale of new
physics associated with mu - tau flavor violation, which is a piece in the
puzzle of the origin of neutrino oscillations. We survey existing experimental
bounds on this scale, which arise mostly from tau and B decays. In many cases
the new physics scale is constrained to be above a few TeV. We also discuss the
operators which are either weakly constrained or, at present, subject to no
experimental bounds.


title:
Light Higgs-boson production at the Photon Collider at TESLA with an
  improved background analysis

abstract:
  Measurement of the Gamma(h -> gamma gamma)Br(h -> b bbar) at the Photon
Collider at TESLA is studied for the Standard Model Higgs boson with mass of
120 to 160 GeV. The NLO estimation of background, analysis of overlaying
events, realistic b-tagging and corrections for escaping neutrinos were
performed. We find that for M_h = 120-160 GeV the Gamma(h -> gamma gamma)Br(h
-> b bbar) can be measured with a statistical accuracy of 2-7% after one year
of the Photon Collider running.


title:
Collision times in pi-pi and pi-K scattering and spectroscopy of meson
  resonances

abstract:
  Using the concept of collision time (time delay) introduced by Eisenbud and
Wigner and its connection to on-shell intermediate unstable states, we study
mesonic resonances in pi-pi and pi-K scattering. The time-delay method proves
its usefulness by revealing the spectrum of the well-known rho- and K*-mesons
and by supporting some speculations on rho-mesons in the 1200 MeV region. We
use this method further to shed some light on more speculative meson
resonances, among others the enigmatic scalars. We confirm the existence of
chiralons below 1 GeV in the unflavoured and strange meson sector.


title: Generalized Analysis of Weakly-Interacting Massive Particle Searches

abstract:
  We perform a generalized analysis of data from WIMP search experiments for
point-like WIMPs of arbitrary spin and general Lorenz-invariant WIMP-nucleus
interaction. We show that in the non-relativistic limit only spin-independent
(SI) and spin-dependent (SD) WIMP-nucleon interactions survive, which can be
parameterized by only five independent parameters. We explore this
five-dimensional parameter space to determine whether the annual modulation
observed in the DAMA experiment can be consistent with all other experiments.
The pure SI interaction is ruled out except for very small region of parameter
space with the WIMP mass close to 50 GeV and the ratio of the WIMP-neutron to
WIMP-proton SI couplings $-0.77\le f_n/f_p\le -0.75$. For the predominantly SD
interaction, we find an upper limit to the WIMP mass of about 18 GeV, which can
only be weakened if the constraint stemming from null searches for energetic
neutrinos from WIMP annihilation the Sun is evaded. None of the regions of the
parameter space that can reconcile all WIMP search results can be easily
accommodated in the minimal supersymmetric extension of the standard model.


title: Neutrino oscillations in the framework of the tree-neutrino mixing

abstract:
  In the framework of the three-neutrino mixing the neutrino oscillations in
the atmospheric and solar ranges of neutrino mass-squared differences are
considered in the leading approximation. Neutrinoless double $\beta$- decay is
also discussed.


title: One-loop finite potential for N-2 scalars from N quantum fields

abstract:
  We study the one-loop effective potential induced from quantum fluctuation of
a finite number of fields. A series expansion in terms of the modified Bessel
functions is useful to evaluate the one-loop effective potential. We find that
at most $N-2$ scalars parameterize the one-loop finite potential and the
explicit parameterization is shown. The structure of the potential for N=4 is
investigated as the simplest case. The implication of the model is discussed.


title: Renormalisation group improved small-x Green's function

abstract:
  We investigate the basic features of the gluon density predicted by a
renormalisation group improved small-x equation which incorporates both the
gluon splitting function at leading collinear level and the exact BFKL kernel
at next-to-leading level. We provide resummed results for the Green's function
and its hard Pomeron exponent $\omega_s(\alpha_s)$, and for the splitting
function and its critical exponent $\omega_c(\alpha_s)$. We find that
non-linear resummation effects considerably extend the validity of the hard
Pomeron regime by decreasing diffusion corrections to the Green's function
exponent and by slowing down the drift towards the non-perturbative Pomeron
regime. As in previous analyses, the resummed exponents are reduced to
phenomenologically interesting values. Furthermore, significant preasymptotic
effects are observed. In particular, the resummed splitting function departs
from the DGLAP result in the moderate small-x region, showing a shallow dip
followed by the expected power increase in the very small-x region. Finally, we
outline the extension of the resummation procedure to include the photon impact
factors.


title:
Comment on polarized quark distributions extracted from SIDIS
  experiments

abstract:
  The results of SIDIS experiments concerning the first moments of the
polarized quark distributions are considered. The possible reasons of the
deviation from the fundamental restrictions such as the Bjorken sum rule and
the ways to properly improve the analysis of measured SIDIS asymmetries are
discussed. The possibility of broken polarized sea scenario is analysed.


title:
Fermion Masses and Mixing Angles from SU(3) Family Symmetry and
  Unification

abstract:
  We develop a bottom-up approach to constructing a theory of fermion masses
and mixing angles based on the gauge group $SU(3)\times G$ where SU(3) is a
family symmetry and $G$ contains a unified group such as SO(10) or its
Pati-Salam subgroup, together with other discrete symmetries. We construct a
realistic model and show that it can provide an excellent description of quark
and lepton masses and mixing angles, including almost maximal atmospheric
mixing and the LMA MSW solar neutrino solution. We predict a neutrino mixing
angle $\theta_{13}$ near the current limit. The model provides the basis for a
new solution to the flavour problem with a characteristic soft SUSY breaking
mass spectrum.


title: Grand Unification of Quark and Lepton FCNCs

abstract:
  In the context of Supersymmetric Grand Unified theories with soft breaking
terms arising at the Planck scale, it is generally possible to link flavor
changing neutral current and CP violating processes occurring in the leptonic
and hadronic sectors. We study the correlation between flavor changing squark
and slepton mass insertions in models \`a la SU(5). We show that the
constraints coming from lepton flavor violation exhibit a strong impact on
CP-violating B decays.


title: Neutrino masses twenty-five years later

abstract:
  The discovery of neutrino mass marks a turning point in elementary particle
physics, with important implications for nuclear and astroparticle physics.
Here I give a brief update, where I summarize the current status of
three-neutrino oscillation parameters from current solar, atmospheric, reactor
and accelerator neutrino data, discuss the case for sterile neutrinos and LSND,
and also the importance of tritium and double beta decay experiments probing
the absolute scale of neutrino mass. In this opininated look at the present of
neutrino physics, I keep an eye in the future, and a perspective of the past,
taking the oportunity to highlight Joe Schechter's pioneering contribution,
which I have had the fortune to share, as his PhD student back in the early
eighties.


title: Electroweak radiative corrections to e+ e- -> t anti-t H

abstract:
  We have calculated the complete electroweak O(alpha) radiative corrections to
the Higgs-boson production process e+ e- -> t anti-t H in the electroweak
Standard Model. Initial-state radiation beyond O(alpha) is included in the
structure-function approach. The calculation of the corrections is briefly
described, and numerical results are presented for the total cross section.
Both the photonic and the genuine weak corrections reach the order of about 10%
or even more and show a non-trivial dependence on the Higgs-boson mass and on
the scattering energy. We compare our results with two previous calculations
that obtained differing results at high energies.


title: b to s transitions: where to look for SUSY

abstract:
  We present a systematic study of the CP conserving and violating SUSY
contributions to b to s processes in a generic MSSM, considering gluino
exchange contributions. Experimental information on B to Xs gamma, B to Xs l+
l- and the Bs-Bsbar mass difference Delta Ms have been taken into account. We
study the induced correlations among several observables: Delta Ms and the
amount of CP violation in B to phi Ks, Bs to J/psi phi, B to Xs gamma. Our
results show that b to s transitions represent a splendid opportunity to
constrain different MSSM realizations and offer concrete prospects to exhibit
SUSY signals at B factories and hadron colliders.


title:
Unitarity Triangle Analysis in the Standard Model and Sensitivity to New
  Physics

abstract:
  By using the most recent determinations of the several theoretical and
experimental input parameters, we update the Unitarity Triangle analysis in the
Standard Model and discuss the sensitivity to New Physics effects. We
investigate the interest of measuring with a better precision the various
physical quantities entering the Unitarity Triangle analysis and study in a
model independent way whether, despite the undoubted success of the CKM
mechanism in the Standard Model, the Unitarity Triangle analysis still allows
the presence of New Physics.


title:
Nonperturbative definition of the pole mass and short distance expansion
  of the heavy quark potential in QCD

abstract:
  We show that the O(Lambda) ambiguity in the pole mass can be fixed in a
natural way by introducing a modified nonperturbative V-scheme momentum space
coupling tilde-alphaV(q) where the confining contributions have been subtracted
out. The method used is in the spirit of the infrared finite coupling approach
to power corrections, and gives a non perturbative definition of the `potential
subtracted' mass. The short distance expansion of the static potential is
derived, taking into account an hypothetical short distance linear term. The
magnitude of the standard OPE contributions are estimated in quenched QCD,
based on results of Luscher and Weisz. It is observed that the expansion is not
yet reliable at the shortest distances presently measured on the lattice.


title: Lower bounds on the curvature of the Isgur-Wise function

abstract:
  Using the OPE, we obtain new sum rules in the heavy quark limit of QCD, in
addition to those previously formulated. Key elements in their derivation are
the consideration of the non-forward amplitude, plus the systematic use of
boundary conditions that ensure that only a finite number of $j^P$ intermediate
states (with their tower of radial excitations) contribute. A study of these
sum rules shows that it is possible to bound the curvature $\sigma^2 =
\xi''(1)$ of the elastic Isgur-Wise function $\xi (w)$ in terms of its slope
$\rho^2 = - \xi '(1)$. Besides the bound $\sigma^2 \geq {5 \over 4} \rho^2$,
previously demonstrated, we find the better bound $\sigma^2 \geq {1 \over 5} [4
\rho^2 + 3(\rho^2)^2]$. We show that the quadratic term ${3 \over 5}
(\rho^2)^2$ has a transparent physical interpretation, as it is leading in a
non-relativistic expansion in the mass of the light quark. At the lowest
possible value for the slope $\rho^2 = {3 \over 4}$, both bounds imply the same
bound for the curvature, $\sigma^2 \geq {15 \over 16}$. We point out that these
results are consistent with the dispersive bounds, and, furthermore, that they
strongly reduce the allowed region by the latter for $\xi (w)$.


title:
Impact-parameter dependence of the generalized parton distribution of
  the pion in chiral quark models

abstract:
  We compute the off-forward diagonal non-singlet generalized parton
distribution of the pion in two distinct chiral quark models: the
Nambu-Jona-Lasinio model with the Pauli-Villars regulator and the Spectral
Quark Model. The analysis is carried out in the impact-parameter space.
Leading-order perturbative QCD evolution is carried out via the inverse Mellin
transform in the index space. The model predictions agree very reasonably with
the recent results from transverse-lattice calculations, reproducing
qualitatively both the Bjorken-x and the impact-parameter dependence of the
data.


title:
Flux of atmospheric muons: Comparison between AIRES simulations and
  CAPRICE98 data

abstract:
  We report on a comparison between the flux of muons in the atmosphere
measured by the CAPRICE98 experiment and simulations performed with the air
shower simulation program AIRES. To reduce systematic uncertainties we have
used as input the primary fluxes of protons and helium nuclei also measured by
the CAPRICE98 experiment. Heavy nuclei are also taken into account in the
primary flux, and their contribution to the muon flux is discussed. The results
of the simulations show a very good agreement with the experimental data, at
all altitudes and for all muon momenta. With the exception of a few isolated
points, the relative differences between measured data and simulations are
smaller than 20 %; and in all cases compatible with zero within two standard
deviations. The influence of the input cosmic ray flux on the results of the
simulations is also discussed. This report includes also an extensive analysis
of the characteristics of the simulated fluxes.


title:
The electroweak form factor \hat{\kappa}(q^2) and the running of \sin^2
  \hat{\theta}_W

abstract:
  Gauge independent form factors \rho^(e; e) and \hat{\kappa}^(e; e)(q^2) for
Moller scattering at s << m_W^2 are derived. It is pointed out that
\hat{\kappa}^(e; e) is very different from its counterparts in other processes.
The relation between the effective parameter \hat{\kappa}^(e; e)(q^2,\mu)
\sin^2 \hat{\theta}_W(\mu) and \sin^2 \theta_eff is derived in a
scale-independent manner. A gauge and process-independent running parameter
\sin^2 \hat{\theta}_W (q^2), based on the pinch-technique self-energy a_{\gamma
Z} (q^2), is discussed for all q^2 values. At q^2=0 it absorbs very accurately
the Czarnecki-Marciano calculation of the Moller scattering asymmetry at low s
values, and at q^2 = m^2_Z it is rather close to \sin^2 \theta_eff. The q^2
dependence of \sin^2 \hat{\theta}_W (q^2) is displayed in the space and
time-like domains.


title: QCD Factorization in $B$ Decays into $\rho \pi$

abstract:
  Based on the QCD factorization approach we analyse the branching ratios for
the channel $B \to \rho \pi$. From the comparisons with experimental data
provided by CLEO, BELLE and BABAR we constrain the form factor $F^{B \to
\pi}(m_{\rho}^{2})$ and propose boundaries for this form factor depending on
the CKM matrix element parameters $\rho$ and $\eta$.


title: The Impact of Universal Extra Dimensions on FCNC Processes

abstract:
  We review the results of two papers on FCNC processes in the Appelquist,
Cheng and Dobrescu (ACD) model with one universal extra dimension.


title: CP Violation in B and K Decays: 2003

abstract:
  These lectures give a brief description of CP violation in B and K meson
decays with particular emphasize put on the determination of the CKM matrix.
The following topics will be discussed: i) The CKM matrix, the unitarity
triangle and general aspects of the theoretical framework, ii)
Particle-antiparticle mixing and various types of CP violation, iii) Standard
analysis of the unitarity triangle, iv) The ratio epsilon^prime/epsilon, v) The
most important strategies for the determination of the angles $\alpha$, $\beta$
and $\gamma$ from B decays, vi) Rare decays $K^+\to\pi^+\nu\bar\nu$ and
$K_L\to\pi^0\nu\bar\nu$ vii) Models with minimal flavour violation.


title: Hadron Production in Proton-Proton Scattering in NEXUS3

abstract:
  Using the recently introduced model NEXUS 3, we calculate for proton-proton,
neutron-proton and antiproton-proton collisions the excitation function of
particle yields and of average transverse momenta of different particle species
as well as rapidity, x_{F} and transverse momentum distributions. Our results
are compared with available data in between sqrt{s} = 5 GeV and 65 GeV. We find
for all observables quite nice agreement with data what make this model to a
useful tool to study particle production in elementary hadronic reactions.


title: Neutrino mixing and Lorentz invariance

abstract:
  We use previous work on the Hilbert space for mixed fields to derive deformed
dispersion relations for neutrino flavor states. We then discuss how these
dispersion relations may be incorporated into frameworks encoding the breakdown
of Lorentz invariance. We consider non-linear relativity schemes (of which
doubly special relativity is an example), and also frameworks allowing for the
existence of a preferred frame. In both cases we derive expressions for the
spectrum and end-point of beta decay, which may be used as an experimental
probe of the peculiar way in which neutrinos experience Lorentz invariance.


title:
NNLO QCD corrections to the Higgs-strahlung processes at hadron
  colliders

abstract:
  We implement, at next-to-next-to-leading order, the QCD corrections to
Standard Model Higgs boson production in association with vector bosons at
hadron colliders, $q\bar{q} \to HV$ with $V=W,Z$. They consist of the two--loop
corrections to the Drell--Yan process for the production of off-shell vector
bosons, $q\bar{q} \to V^*$, and in the case of $Z$ final states, of the
additional contribution from heavy-quark loop mediated processes, in particular
$gg \to HZ$. For the Higgs boson masses relevant at the Tevatron and the LHC,
$M_H \lsim 200$--300 GeV, the two-loop corrections are small, increasing the
production cross sections by less than 5% and 10%, respectively; the scale
dependence is reduced to a level of less than a few per cent. This places these
processes among the most theoretically clean Higgs boson production channels at
hadron colliders.


title:
NNLO soft and virtual corrections for electroweak, Higgs, and SUSY
  processes

abstract:
  I present applications of a master formula for next-to-next-to-leading order
soft and virtual QCD corrections to various electroweak, Higgs, and
supersymmetric processes. They include Drell-Yan and charged Higgs production,
single-top production in flavor-changing neutral-current processes, and squark
and gluino production.


title:
Non-perturbative effects and the resummed Higgs transverse momentum
  distribution at the LHC

abstract:
  We investigate the form of the non-perturbative parameterization in both the
impact parameter (b) space and transverse momentum (p_T) space resummation
formalisms for the transverse momentum distribution of single massive bosons
produced at hadron colliders. We propose to analyse data on Upsilon
hadroproduction as a means of studying the non-perturbative contribution in
processes with two gluons in the initial state. We also discuss the theoretical
errors on the resummed Higgs transverse momentum distribution at the LHC
arising from the non-perturbative contribution.


title:
The structure of electroweak corrections due to extended gauge
  symmetries

abstract:
  This paper studies models with extended electroweak gauge sectors of the form
SU(2) x SU(2) x U(1) x [SU(2) or U(1)]. We establish the general behavior of
corrections to precision electroweak observables in this class of theories and
connect our results to previous work on specific models whose electroweak
sectors are special cases of our extended group.


title: Tau Neutrinos at EeV Energies

abstract:
  Astrophysical sources of ultrahigh energy neutrinos yield tau neutrino fluxes
due to neutrino oscillations. At neutrino energies in the EeV range, radio
Cherenkov detection methods show promise for detecting these fluxes. We
quantify the tau neutrino contributions to the signal in, for example, a
detector like the Radio Ice Cherenkov Experiment (RICE) for a Z-burst flux
prediction. Tau neutrino regeneration in transit through the Earth, including
energy loss, is evaluated.


title: Nuclear effects and their interplay in nuclear DVCS amplitudes

abstract:
  In this paper we analyze nuclear medium effects on DVCS amplitudes in the
$\Bx$ range of $0.1-0.0001$ for a large range of $Q^2$ and four different
nuclei. We use our nucleon GPD model capable of describing all currently
available DVCS data on the proton and extend it to the nuclear case using two
competing parameterizations of nuclear effects. The two parameterizations,
though giving different absolute numbers, yield the same type and magnitude of
effects for the imaginary and real part of the nuclear DVCS amplitude. The
imaginary part shows stronger nuclear shadowing effects compared to the
inclusive case i.e. $F^N_2$, whereas in the real part nuclear shadowing at
small $\Bx$ and anti-shadowing at large $\Bx$ combine through evolution to
yield an even greater suppression than in the imaginary part up to large values
of $\Bx$. This is the first time that such a combination of nuclear effects has
been observed in a hadronic amplitude. The experimental implications will be
discussed in a subsequent publication.


title: Constraints on the CKM Angle gamma from B -> K*+- pi-+

abstract:
  We present constraints on the CKM parameter gamma=arg(Vub*) formed within the
framework of SU(3) symmetry and based on charmless hadronic B decays to K*+-
pi-+ and other pseudoscalar-vector final states. For strong phases of O(10
degrees), our analysis weakly favors cos(gamma)<0. We also estimate that a
determination of $\gamma$ with an experimental uncertainty of less than
$10^\circ$ can be attained with an order-of-magnitude improvement in the
precision of the experimental inputs, but SU(3) symmetry breaking could
introduce corrections approaching the size of the current experimental
uncertainties.