title: $B \to X_s +$ missing energy in models with large extra dimensions

abstract:
  We study the neutral current flavour changing rare decay mode $B\to X_s +$
missing energy within the framework of theories with large extra spatial
dimensions. The corresponding Standard Model signature is $B\to X_s + \nu
\bar{\nu}$. But in theories with large extra dimensions, it is possible to have
scalars and gravitons in the final state making it quite distinct from any
other scenario where there are no gravitons and the scalars are far too heavier
than the B-meson to be present as external particles. We give an estimate of
the branching ratio for such processes for different values of the number of
extra dimensions and the effective scale of the effective theory.


title: Chiral QCD, General QCD Parameterization and Constituent Quark Models

abstract:
  Several recent papers -using effective QCD chiral Lagrangians- reproduced
results obtained with the general QCD parameterization (GP). These include the
baryon 8+10 mass formula, the octet magnetic moments and the coincidental
nature of the "perfect" -3/2 ratio between the magnetic moments of p and n.
Although we anticipated that the GP covers the case of chiral treatments, the
above results explicitly exemplify this fact. Also we show by the GP that -in
any model or theory (chiral or non chiral) reproducing the results of exact
QCD- the Franklin (Coleman Glashow) sum rule for the octet magnetic moments
must be violated.


title:
Extraction of the strong coupling constant and strange quark mass from
  semileptonic tau decays

abstract:
  In this lecture I present a pedagogical introduction to the low-energy
phenomenology of light flavors. The renormalization scheme freedom in defining
QCD parameters is discussed. It is shown in some details how one can extract an
accurate numerical value for the strong coupling constant from the tau-lepton
decay rate into hadrons. As a related topic I discuss some peculiarities of
definition of the quark mass in theories with confinement and describe the
strange quark mass determination from data on tau-lepton decays employing
contour resummation which is a modern technique of the precision analysis in
perturbative QCD.


title:
The renormalization of the effective gauge Lagrangian with spontaneous
  symmetry breaking: the U(1) case

abstract:
  We study the renormalization of the nonlinear effective U(1) Lagrangian up to
$O(p^4)$ with spontaneous symmetry breaking. The problems of the quartic
divergences and of the truncation of infinite divergence tower are addressed.
The renormalization group equations of the effective Lagrangian are derived,
which make it possible to get the leading logarithm corrections of the heavy
degree of freedom, even if the effective and full theories are matched at tree
level. The method we use in the U(1) case can easily be extended to study the
non-Abelian effective theories and the electroweak chiral Lagrangian.


title: QCD Analysis of hadronic tau lepton decays

abstract: Diploma paper written at the Johannes Gutenberg-Universitaet Mainz.


title: Cosmological Matter-Antimatter Asymmetry and Antimatter in the Universe

abstract:
  Models of baryogenesis which may lead to astronomically significant amount of
antimatter in the universe are reviewed. Observational features are briefly
discussed.


title:
Renormalization group improvement of truncated perturbative series in
  QCD. Decays of tau-lepton and eta_c-charmonium

abstract:
  We formulate a general scheme to improve the truncated perturbative expansion
in alpha_s by means of the renormalization group in QCD for the single-scale
quantities. The procedure is used for the evaluation of hadronic decay rates of
tau-lepton and eta_c-charmonium. The scale dependence of result for eta_c is
studied in the scheme of fixed value for the MS-bar mass of charmed quark.


title: Hierarchy and Wave Functions in a Simple Quantum Cosmology

abstract:
  Astrophysical observations indicate the expansion of the universe is
accelerating. Applying the holographic entropy conjecture to the cosmological
horizon in an accelerating universe suggests the universe has only a finite
number of degrees of freedom. This is consistent with a closed universe arising
from a quantum fluctuation, with zero total quantum numbers. If space-time has
eleven dimensions, and the universe began as a closed force-symmetric
ten-dimensional space with characteristic dimension L, seven of the space
dimensions must have collapsed to generate the three large space dimensions we
see. The holographic conjecture then suggests the initial length scale L must
be roughly twenty orders of magnitude larger than the Planck length.
Accordingly, the nuclear force must be roughly forty orders of magnitude
stronger than gravity, possibly resolving the force hierarchy problem. A
wavefunction for the radius of curvature of the universe can be obtained from
the Schrodinger equation derived by Elbaz and Novello. The product of this
wavefunction and its complex conjugate can be interpreted as the probability
density for finding a given radius of curvature in one of the infinity of
measurements of the radius of curvature possible (in principle) at any location
in a homogeneous isotropic universe.


title: Novel hard semiexclusive processes and color singlet clusters in hadrons

abstract:
  Hard scattering to a three cluster final state is suggested as a method to
probe configurations in hadrons containing small size color singlet cluster and
a residual quark-gluon system of a finite mass. Examples of such processes
include $e + N \to e+ p +M_X (\Lambda+M_X'), p+p \to p+p+M_X(p+\Lambda+M_X')$
where $M_X(M_X')$ could be a pion(kaon) or other state of finite mass which
does not increase with momentum transfer ($Q^2$). We argue that different
models of the nucleon may lead to very different qualitative predictions for
the spectrum of states $M_X$. We find that in the pion model of nonperturbative
$q \bar q$ sea in a nucleon the cross section of these reactions is comparable
to the cross section of the corresponding two-body reaction. Studies of these
reactions are feasible using both fixed target detectors (EVA at BNL, HERMES at
DESY) and collider detectors with a good acceptance in the forward direction.


title: Searches for sterile component with solar neutrinos and KamLAND

abstract:
  Possible mixing of the active and sterile neutrinos has been considered both
in the single Delta m^2 approximation and in the case of more than one Delta
m^2. We perform global fit of the available solar neutrino data with free boron
neutrino flux in the single Delta m^2 context. The best fit value corresponds
to zero fraction of sterile component eta=0. We get the upper bounds: eta<0.26
(0.64) at 1\sigma (3 sigma). Due to degeneracy of parameters no one individual
experiment restricts eta. The bound appears as an interplay of the SNO and
Gallium as well as SuperKamiokande data. Future measurements of the NC/CC ratio
at SNO can strengthen the bound down to eta<0.5 (3 sigma). If KamLAND confirms
the LMA solution with its best fit point a combined analysis of the KamLAND and
solar neutrino results will lead to eta<0.19 (0.56) at 1 sigma (3 sigma). We
find that existence of sterile neutrino can explain the intermediate value of
suppression of the KamLAND event rate: R_{KL}~0.75-0.90 in the case when more
than one Delta m^2 is involved.


title: Correlation between LFV and muon (g-2) in MSSM

abstract:
  We give a simultaneous analysis of $g_\mu-2$ and lepton flavor violation
within MSSM. Working on the interaction basis, we give direct relations between
$\delta a_\mu$ and Br$(\tau\to\mu\gamma)$ induced by the supersymmetric
particles. We find the SUSY parameter space to satisfy the $g_\mu-2$ constraint
can be considerably different from that given in case of no lepton flavor
mixing in the soft SUSY breaking sector.


title: Testing the solar LMA region with KamLAND data

abstract:
  We investigate the potential of 3 kiloTon-years(kTy) of KamLAND data to
further constrain the $\Delta m^2$ and $\tan^2\theta$ values compared to those
presently allowed by existing KamLAND and global solar data. We study the
extent, dependence and characteristics of this sensitivity in and around the
two parts of the LMA region that are currently allowed. Our analysis with 3 kTy
simulated spectra shows that KamLAND spectrum data by itself can constrain
$\Delta m^2$ with high precision. Combining the spectrum with global solar data
further tightens the constraints on allowed values of $\tan^2\theta$ and
$\Delta m^2$. We also study the effects of future neutral current data with a
total error of 7% from the Sudbury Neutrino Observatory. We find that these
future measurements offer the potential of considerable precision in
determining the oscillation parameters (specially the mass parameter).


title: Effect of Fourth Generation CP Phase on b\to s Transitions

abstract:
  We study the effect of a sequential fourth generation on b\to s gamma, B_s
mixing, B\to K^{(*)}\ell^+\ell^-, X_s\ell^+\ell^- and \phi K_S, taking into
account the presence of a new CP phase in quark mixing. We find that the
effects via electromagnetic and strong penguins, such as in b\to s gamma or CP
violation in B\to \phi K_S, are rather mild, but impact via box or Z penguins
is quite significant. Not only can one have much larger than expected B_s
mixing, even if it is measured near the present limit, mixing dependent CP
violation could become maximal. For electroweak penguin modes, the fourth
generation can provide the enhancement that perhaps may be needed, while the
m_{\ell^+\ell^-} dependence of the forward-backward asymmetry in B\to
K^{*}\ell^+\ell^- can further probe for the fourth generation. These effects
can be studied in detail at the B factories and the Tevatron.


title: Full O(alpha) corrections to e+e- --> nu nu-bar H by GRACE

abstract:
  We present the full O(alpha) corrections to single Higgs production in e+e-
collision. The computation is performed with the help of GRACE-LOOP where a
generalized non-linear gauge fixing condition is implemented. The numerical
results are checked by testing their UV and IR finiteness as well as their
independence on all five non-linear gauge parameters. We find that for a 500
GeV collider and a light Higgs boson of mass 150GeV, the total correction is
small when the results are expressed in terms of alpha rather than G_mu. For a
higher Higgs boson mass of 350GeV, the correction is of order -10%.


title: Renormalization of the Cabibbo-Kobayashi-Maskawa Quark Mixing Matrix

abstract:
  We have investigated the present renormalization prescriptions of
Cabibbo-Kobayashi-Maskawa (CKM) matrix. When considering the prescription which
is formulated with reference to the case of zero mixing we find it doesn't
satisfy the unitary condition of the bare CKM matrix. After added a delicate
patch this problem can be solved at one-loop level. In this paper We generalize
this prescription to all loop levels and keep the unitarity of the bare CKM
matrix, simultaneously make the amplitude of an arbitrary physical process
involving quark mixing convergent and gauge independent. We also find that in
order to keep the CKM counterterms gauge independent the unitarity of the bare
CKM matrix must be preserved.


title: B meson light-cone wavefunctions in the heavy quark limit

abstract:
  We present a systematic study of the B meson light-cone wavefunctions in QCD
in the heavy-quark limit. We construct model-independent formulae for the
light-cone wavefunctions in terms of independent dynamical degrees of freedom,
which exactly satisfy the QCD equations of motion and constraints from
heavy-quark symmetry. The results demonstrate novel behaviors of longitudinal
as well as transverse momentum distribution in the B mesons.


title:
Chiral corrections and lattice QCD results for fBs/fBd and (Delta
  ms/Delta md)

abstract:
  It has been argued recently that the inclusion of the chiral logarithms in
extrapolation of the lattice data can shift the value of the hadronic parameter
xi = (fBs sqrt(B_{Bs}))/(fBd sqrt(B_{Bd})), from 1.16(6) to 1.32(10) and even
higher. If true, that would considerably change the theoretical estimate for
the ratio of oscillation frequencies in the neutral Bs- and Bd-systems, and
would affect the standard CKM unitarity triangle analysis. In this letter we
show that (fBs/fBd) \approx (fK/fpi), and thus the uncertainty due to the
missing chiral logs is smaller than previously thought. By combining the NLO
chiral expansion with the static heavy quark limit we obtain xi = 1.22(8).


title: Threshold resummation for nonleptonic B meson decays

abstract:
  We investigate the double logarithmic corrections $\alpha_s\ln^2 x$, x being
a parton momentum fraction, in two-body nonleptonic B meson decays in collinear
factorization theorem of perturbative QCD (PQCD). It is found that these
corrections are universal for factorizable amplitudes, {\it i.e.}, at the
leading power, and that their threshold resummation smears the end-point
singularities from $x\to 0$. The double logarithmic corrections, depending on
the topologies of nonfactorizable amplitudes at the subleading power, are
negligible due to the color-transparency argument and to the overlap of three
meson distribution amplitudes. We show that the PQCD approach to two-body
nonleptonic B meson decays respects the factorization assumption in the
heavy-quark limit.


title:
Analysis of solar neutrino problem by means of N\"{o}tzold and
  Nakagawa's approach including the interference term- Hyperbolic-tangent
  profile for electron density in the sun and exact solution -

abstract:
  Using an exact solution with the hyperbolic-tangent profile for the electron
density in the sun, which is developed by N\"{o}tzold and later modified by
Nakagawa, we have analyzed the solar neutrino problem. An interference term in
their approach is correctly taken into account. Combining the
hyperbolic-tangent profile with the BP2000, we obtain a phenomenological
fitting in the analytic form. Combining recent observed results for survival
probability $P(\nu_e \to \nu_e)$ by the SNO, SK, SAGE, Gallex, GNO and
Homestake Collaborations, we obtain a large mixing angle (LMA) whose figure is
looking like a shoulder.


title: Neutrinoless double beta decay with scalar bilinears

abstract:
  One possible probe to physics beyond the standard model is to look for scalar
bilinears, which couple to two fermions of the standard model. We point out
that the scalar bilinears allow new diagrams contributing to the neutrinoless
double beta decay. The upper bound on the neutrinoless double beta decay
lifetime would then give new constraints on the ratio of the masses of these
scalars to their couplings to the fermions.


title: Meson Form Factors and the Quark-Level Linear Sigma Model

abstract:
  The quark-level linear sigma model is employed to compute a variety of
electromagnetic and weak observables of light mesons, including pion and kaon
form factors and charge radii, charged-pion polarizabilities, semileptonic weak
$K_{\ell3}$ decay, semileptonic weak radiative pion and kaon form factors,
radiative decays of vector mesons, and nonleptonic weak $K_{2\pi}$ decay. The
agreement of all these predicted observables with experiment is striking. In
passing, the tight link between the linear sigma model and vector-meson
dominance is shown. Some conclusions are drawn on the linear sigma model in
connection with lattice and renormalization-group approaches to QCD.


title: Testing Neutrino Parameters at Future Accelerators

abstract:
  The simplest unified extension of the Minimal Supersymmetric Standard Model
with bilinear R--Parity violation provides a predictive scheme for neutrino
masses which can account for the observed atmospheric and solar neutrino
anomalies.Despite the smallness of neutrino masses R-parity violation is
observable at present and future high-energy colliders, providing an
unambiguous cross-check of the model.


title: End-point singularities of Feynman graphs on the light cone

abstract:
  We show that some Lorentz components of the Feynman integrals calculated in
terms of the light-cone variables may contain end-point singularities which
originate from the contribution of the big-circle integral in the complex k_
plane. These singularities appear in various types of diagrams (two-point
functions, three-point functions, etc) and provide the covariance of the
Feynman integrals on the light-cone. We propose a procedure for calculating
Feynman integrals which guarantees that the end-point singularities do not
appear in the light-cone representations of the invariant amplitudes.


title: Sensitivity of pQCD deuteron structure to the nucleon form factors

abstract:
  We discuss the applicability of pQCD to the elastic scattering of electrons
on protons and deuterons. We analyze the $Q^2$-dependence of the reduced
deuteron form factor, taking into account the recent data on the electric
proton form factor and we find that the value of the QCD-scale parameter
$\Lambda$ differs essentially from the value $\Lambda=0.1$ GeV, previously
found using the dipole parametrization of the electromagnetic nucleon form
factors $G_E$ and $G_M$. Moreover the predicted scaling behavior of the reduced
deuteron form factor can not be recovered in the Dirac and Pauli
representations for the nucleon electromagnetic form factors.


title: Yukawa structure, flavour and CP violation in Supergravity

abstract:
  The hierarchical structure of fermion masses and mixings strongly suggests an
underlying family symmetry. In supergravity any familon field spontaneously
breaking this symmetry necessarily acquires an F-term which contributes to the
soft trilinear couplings. We show, as a result, mu -> e gamma decay can receive
large contributions from this source at the level of current experimental
bounds and thus this channel may provide the first indication of supersymmetry
and a clue to the structure of the soft breaking sector. Using the mercury EDM
bounds we find strong bounds on the right handed down quark mixing angles that
are inconsistent with models relating them to neutrino mixing angles and favour
a near-symmetric form for the magnitude of the down quark mass matrix.


title: Two-Loop Electroweak Corrections to $\Delta r$

abstract:
  The two-loop electroweak bosonic correction to the muon lifetime is computed
using methods of asymptotic expansion. Combined with previous calculations this
completes the full two-loop correction to $\Delta r$ in the Standard Model.


title: Transport Coefficients at Leading Order: Kinetic Theory versus Diagrams

abstract:
  I review what is required to compute transport coefficients in
ultra-relativistic, weakly coupled gauge theories, at leading order in $g$,
using kinetic theory. Then I discuss how the calculation would look in
alternative approaches: the 2PI method, and direct diagrammatic analysis. I
argue that the 2PI method may be a good way to derive the kinetic theory, but
is not very useful directly (in a gauge theory). The diagrammatic approach is
almost hopeless.


title:
Improving bounds on $\gamma$ in $B^{\pm} \to DK^{\pm}$ and $B^{\pm,0}
  \to D X_s^{\pm,0}$

abstract:
  In view of recent experimental progress in rate and CP asymmetry measurements
in $B^{\pm} \to DK^{\pm}$, we reconsider information on the weak phase $\gamma$
which can be obtained from these processes. Model-independent inequalities are
proven for $\sin^2\gamma$ in terms of two ratios of partial rates for
$B^{\pm,0} \to D X_s^{\pm,0}$, where $X_s$ is any multiparticle charmless state
carrying strangeness $\pm 1$. Good prospects are shown to exist for using these
inequalities and CP asymmetry measurements in two body and multibody decays in
order to improve present bounds on $\gamma$.


title:
Sleptonarium (Constraints on the CP and Flavour Pattern of Scalar Lepton
  Masses)

abstract:
  The constraints on the flavour and CP structure of scalar lepton mass
matrices are systematically collected. The display of the resulting upper
bounds on the lepton -slepton misalignment parameters is designed for an easy
inspection of very large classes of models and the formula are arranged so as
to suggest useful approximations. Interferences among the different
contributions to lepton flavour violating transitions and lepton electric and
magnetic dipole moments of generic character can either tighten or loose the
bounds. A combined analysis of all rare leptonic transitions can disentangle
the different contributions to yield hints on several phenomenological issues.
The possible impact of these results on the study of the slepton misalignment
originated in the seesaw mechanism and grand-unified theories is emphasized
since the planned experiments are getting close to the precision required in
such tests.


title:
Problems with Time-Varying Extra Dimensions or "Cardassian Expansion" as
  Alternatives to Dark Energy

abstract:
  It has recently been proposed that the Universe might be accelerating as a
consequence of extra dimensions with time varying size. We show that although
these scenarios can lead to acceleration, they run into serious difficulty when
taking into account limits on the time variation of the four dimensional
Newton's constant. On the other hand, models of ``Cardassian'' expansion based
on extra dimensions which have been constructed so far violate the weak energy
condition for the bulk stress energy, for parameters that give an accelerating
universe.


title: eta nucleus optical potential in a chiral unitary approach

abstract:
  The self-energy of an eta in a nuclear medium is calculated in a chiral
unitary model, and applied to eta states in nuclei. Our calculation predicts an
attractive eta nucleus optical potential which can accommodate many eta bound
states in different nuclei.


title:
Updating the constraints to CMSSM from cosmology and accelerator
  experiments

abstract:
  The recent data from E821 Brookhaven experiment in conjunction with a new
determination of the hadronic vacuum polarization contribution to the anomalous
magnetic moment of muon, put new bounds on the parameters of the Constrained
Minimal Supersymmetric Standard Model. We study the impact this experimental
information, along with the $b \goes s \gamma$ branching ratio and light Higgs
boson mass bound from LEP, to constrain regions of the model which are
consistent with the cosmological data. The effect of these to Dark Matter
direct searches is also discussed.


title:
Confining QCD Strings, Casimir Scaling, and a Euclidean Approach to
  High-Energy Scattering

abstract:
  We compute the chromo-field distributions of static color-dipoles in the
fundamental and adjoint representation of SU(Nc) in the loop-loop correlation
model and find Casimir scaling in agreement with recent lattice results. Our
model combines perturbative gluon exchange with the non-perturbative stochastic
vacuum model which leads to confinement of the color-charges in the dipole via
a string of color-fields. We compute the energy stored in the confining string
and use low-energy theorems to show consistency with the static quark-antiquark
potential. We generalize Meggiolaro's analytic continuation from parton-parton
to gauge-invariant dipole-dipole scattering and obtain a Euclidean approach to
high-energy scattering that allows us in principle to calculate S-matrix
elements directly in lattice simulations of QCD. We apply this approach and
compute the S-matrix element for high-energy dipole-dipole scattering with the
presented Euclidean loop-loop correlation model. The result confirms the
analytic continuation of the gluon field strength correlator used in all
earlier applications of the stochastic vacuum model to high-energy scattering.


title: Automatic reduction of four-loop bubbles

abstract:
  We give technical details about the computational strategy employed in a
recently completed investigation of the four-loop QCD free energy. In
particular, the reduction step from generic vacuum bubbles to master integrals
is described from a practical viewpoint, for fully massive as well as QED-type
integrals.


title: Hybrid Mesons Masses in a Quark-Gluon Constituent Model

abstract:
  QCD theory allows the existence of states which cannot be built by the naive
quark model; both theoretical arguments and experimental data confirm the
hypothesis that gluons may have freedom degrees at the constituent level, and
should be confined. In this work, we use a phenomenological potential motivated
by QCD (with some relativistic corrections) to determine the masses and the
wavefunctions of several hybrid mesons, within the context of a constituent
q-qbar-g model. We compare our estimates of the masses with the predictions of
other theoretical models and with the observed masses of candidates.


title: Axial Excitation of the Delta in Chiral Quark Models

abstract:
  We discuss electro-magnetic and weak axial N-Delta transition amplitudes in
the linear sigma-model and the Cloudy-Bag Model as typical representatives of
chiral quark models. We show that good qualitative understanding of the
transition can be obtained in models which, in addition to the pion cloud,
incorporate a fluctuating sigma-field inside the baryon.


abstract:
  These are the mini-proceedings of the workshop ``Spontaneously Broken Chiral
Symmetry and Hard QCD Phenomena" held at the Physikzentrum Bad Honnef from July
15 to 19, 2002. Every author presents a summary of his talk. The transparencies
of all speakers and further information on the workshop can be found on the
website: http://www.tp2.ruhr-uni-bochum.de/hardreactions.html


title:
Axial currents in electro-weak pion production at threshold and in the
  Delta-region

abstract:
  We discuss electro-magnetic and weak production of pions on nucleons and show
how results of experiments and their interpretation in terms of chiral quark
models with explicit meson degrees of freedom combine to reveal the
ground-state axial form factors and axial N-Delta transition amplitudes.


title: N-Delta axial transition form factors

abstract:
  We review some basic properties of the N-Delta transition axial amplitudes
and relate them to the strong pi-N-Delta form-factor. In models with the pion
cloud we derive a set of constraints on the pion wave function which guaranty
the correct behaviour of the amplitudes in the vicinity of the pion pole.
Corrections due to the spurious center-of-mass motion are calculated to the
leading order in the inverse baryon mass. We give explicit expressions for the
amplitudes in the Cloudy Bag Model and show that they rather strongly
underestimate the experimental values.


title: Value of alpha_s from deep-inelastic-scattering data

abstract:
  We report the value of $\alpha_{\rm s}$ obtained from QCD analysis of
existing data on deep-inelastic scattering of charged leptons off proton and
deuterium and estimate its theoretical uncertainties with particular attention
paid to impact of the high-twist contribution to the deep-inelastic-scattering
structure functions. Taking into account the major uncertainties the value
$\alpha^{\rm NNLO}_{\rm s}(M_{\rm Z})=0.1143 \pm 0.0014({\rm exp.})\pm
0.0013({\rm theor.})$ is obtained. An extrapolation of the LO--NLO--NNLO
results to the higher orders makes it possible to estimate $\alpha^{\rm
N^3LO}_{\rm s}(M_{\rm Z})\sim 0.113$.


title: Gluon induced contributions to Z gamma production at hadron colliders

abstract:
  We study the contribution of gluon induced partonic subprocesses to Z gamma
pair production at hadron colliders. These processes contribute only at
next-to-next-to-leading order but are potentially enhanced by two factors of
the gluon parton densities. However, we find that their contribution is modest
and that next-to-leading order calculations give reliable predictions.


title: First results for three-loop deep-inelastic structure functions in QCD

abstract:
  As a first step towards the complete calculation of deep-inelastic scattering
at third order of massless perturbative QCD, we have computed the fermionic
(nf) contributions to the flavour non-singlet structure functions in
unpolarized electromagnetic scattering. We briefly discuss the approach chosen
for this calculation, the problems we encountered and the status of the
project. We show the results for the corresponding anomalous dimension in both
Mellin-N and Bjorken-x. Together with the nf part of A_3, our calculation
facilitates the complete determination of the threshold-resummation
coefficients B_2 and D_2^DIS. The latter quantity vanishes in the MSbar scheme.


title: Tuning FORM with large calculations

abstract:
  Some recent additions to FORM are discussed. In particular large file support
and the tablebases are presented.


title: Jet algorithms: a minireview

abstract:
  Many jet algorithms have been proposed in the past to study the hadronic
final state in E+E-, EP and PP collisions. Here we review some of the most
popular, mainly concentrating on the jet algorithms used at HERA and TEVATRON.


title:
Top mass determination and O (alpha_S^5 m) correction to toponium 1S
  energy level

abstract:
  Recently the full O(alpha_S^5 m, alpha_S^5 m log(alpha_S)) correction to the
heavy quarkonium 1S energy level has been computed (except the a_3-term in the
QCD potential). We point out that the full correction (including the
log(alpha_S)-term) is approximated well by the large-beta_0 approximation.
Based on the assumption that this feature holds up to higher orders, we discuss
why the top quark pole mass cannot be determined to better than O(Lambda_{QCD})
accuracy at a future e^+e^- collider, while the MS-bar mass can be determined
to about 40 MeV accuracy (provided the 4-loop MSbar-pole mass relation will be
computed in due time).


title:
Synergies between the first-generation JHF-SK and NuMI superbeam
  experiments

abstract:
  We discuss synergies in the combination of the first-generation JHF to
Super-Kamiokande and NuMI off-axis superbeam experiments. With synergies we
mean effects which go beyond simply adding the statistics of the two
experiments. As a first important result, we do not observe interesting synergy
effects in the combination of the two experiments as they are planned right
now. However, we find that with minor modifications, such as a different NuMI
baseline or a partial antineutrino running, one could do much richer physics
with both experiments combined. Specifically, we demonstrate that one could,
depending on the value of the solar mass squared difference, either measure the
sign of the atmospheric mass squared difference or CP violation already with
the initial stage experiments. Our main results are presented in a way that can
be easily interpreted in terms of the forthcoming KamLAND result.


title:
The renormalization of the effective Lagrangian with spontaneous
  symmetry breaking: the SU(2) case

abstract:
  We study the renormalization of the nonlinear effective SU(2) Lagrangian up
to $O(p^4)$ with spontaneous symmetry breaking. The Stueckelberg
transformation, the background field gauge, the Schwinger proper time and heat
kernel method, and the covariant short distance expansion technology, guarantee
the gauge covariance and incooperate the Ward indentities in our calculations.
The renormalization group equations of the effective couplings are derived and
analyzed. We find that the difference between the results gotten from the
direct method and the renormalization group equation method can be quite large
when the Higgs scalar is far below its decoupling limit.


title: On the Sudakov suppression and enhancement for electroweak reactions

abstract:
  Accounting for the double-logarithmic (DL) contributions to amplitude of Z to
f \bar{f} leads to the Sudakov suppression. In contrast, resumming DL
contributions to amplitudes of W to f \bar{f}' results into an exponential with
a positive exponent, i.e. into the enhancement. This effect is intrinsic
property of the theories with non-Abelian gauge groups.


title: The Resummed Photon Spectrum in Radiative Upsilon Decays

abstract:
  We present a theoretical prediction for the photon spectrum in radiative
Upsilon decay including the effects of resumming the endpoint region, E_\gamma
-> M_\Upsilon/2. Our approach is based on NRQCD and the soft collinear
effective theory. We find that our results give much better agreement with data
than the leading order NRQCD prediction.


title:
Improved Determination of the Mass of the $1^{-+}$ Light Hybrid Meson
  From QCD Sum Rules

abstract:
  We calculate the next-to-leading order (NLO) $\alpha_s$-corrections to the
contributions of the condensates $<\alpha G^2>$ and $<\bar qq>^2$ in the
current-current correlator of the hybrid current
$g\barq(x)\gamma_{\nu}iF_{\mu\nu}^aT^aq(x)$ using the external field method in
Feynman gauge. After incorporating these NLO contributions into the Laplace
sum-rules, the mass of the $J^{PC}$=$1^{-+}$ light hybrid meson is recalculated
using the QCD sum rule approach. We find that the sum rules exhibit enhanced
stability when the NLO $\alpha_s$-corrections are included in the sum rule
analysis, resulting in a $1^{-+}$ light hybrid meson mass of approximately 1.6
GeV.


title: Decay of High-Energy Astrophysical Neutrinos

abstract:
  Existing limits on the non-radiative decay of one neutrino to another plus a
massless particle (e.g., a singlet Majoron) are very weak. The best limits on
the lifetime to mass ratio come from solar neutrino observations, and are
$\tau/m \agt 10^{-4}$ s/eV for the relevant mass eigenstate(s). For lifetimes
even several orders of magnitude longer, high-energy neutrinos from distant
astrophysical sources would decay. This would strongly alter the flavor ratios
from the $\phi_{\nu_e}:\phi_{\nu_{\mu}}:\phi_{\nu_{\tau}} = 1:1:1$ expected
from oscillations alone, and should be readily visible in the near future in
detectors such as IceCube.


title: Radiative corrections to low energy neutrino reactions

abstract:
  We show that the radiative corrections to charged current (CC) nuclear
reactions with an electron(positron) in the final state are described by a
universal function. The consistency of our treatment of the radiative
corrections with the procedure used to extract the value of the axial coupling
constant $g_A$ is discussed. To illustrate we apply our results to
(anti)neutrino deuterium disintegration and to $pp$ fusion in the sun. The
limit of vanishing electron mass is considered, and a simple formula valid for
$E_{obs}\gsim 1$ MeV is obtained. The size of the nuclear structure-dependent
effects is also discussed. Finally, we consider CC transitions with an
electron(positron) in the initial state and discuss some applications to
electron capture reactions.


title: Implications of the JHF-Kamioka neutrino oscillation experiment

abstract:
  After quickly reviewing the existing evidence for neutrino oscillations, I
summarise the goals and capabilities of the JHF-Kamioka long baseline superbeam
experiment. Theoretical implications of what this experiment could potentially
discover are then discussed.


title: New Physics Effect on the Higgs Self-Coupling

abstract:
  One-loop corrections to the self-coupling constant of the lightest CP-even
Higgs boson are studied in the two Higgs doublet model. After renormalization
is performed, quartic contributions of heavy particle's mass can appear in the
effective coupling. We find that these non-decoupling effects can yield ${\cal
O}(100)$ % deviations from the Standard Model prediction, even when all the
other couplings of the lightest Higgs boson to gauge bosons and fermions are in
good agreement with the Standard Model.


title: Neutrinos in cosmology, with some significant digressions

abstract:
  Neutrinos play prominent roles in both particle physics and cosmology. In
this talk, I will cover two broad topics. The first will be possible origins
for neutrino masses and mixings and the implications of this physics for
cosmology. Some non-cosmological digressions on the flavour problem in general
will be made. The second topic will be Big Bang Nucleosynthesis (BBN) and
bounds on active-sterile neutrino mixing.


title:
Bi-large neutrino mixing from bilinear R-parity violation with
  non-universality

abstract:
  We investigate how the bi-large mixing required by the recent neutrino data
can be accommodated in the supersymmetric standard model allowing bilinear
R-parity violation and non-universal soft terms. In this scheme, the tree-level
contribution and the so-called Grossman-Haber one-loop diagrams are two major
sources of the neutrino mass matrix. The relative size of these two
contributions falls into the right range to generate the atmospheric and solar
neutrino mass hierarchy. On the other hand, the bi-large mixing is typically
obtained by a mild tuning of input parameters to arrange a partial cancellation
among various contributions.


title: Two-pion contribution to the muon magnetic moment

abstract:
  The two-pion contribution to hadronic vacuum polarization can be extracted
from tau decay data when isospin violating and radiative corrections are taken
into account. When the dominant corrections are applied to the photon-inclusive
decay of the tau into two pions, one obtains a shift (-12.0 +/- 2.6).10^{-10}
for the anomalous magnetic moment of the muon. The shift appears to be too
small to reconcile the determinations of hadronic vacuum polarization from
existing tau and e+ e- data. The reliability of electromagnetic corrections in
the photon-inclusive tau decay is examined.


title: Electro-Weak Fits at CLIC

abstract:
  The aim of the future linear colliders is to extend the sensitivity to new
physics beyond the reach of the LHC. Several models predict the existence of
new vector resonances in the multi-TeV region. We review the existing limits on
the masses of these new resonances from LEP/SLC and TEVATRON data and from the
atomic parity violation measurements, in some specific models. We study the
potential of a multi-TeV e+e- collider, such as CLIC, for the determination of
their properties and nature.


title: Jet and Dijet Rates in pA Collisions

abstract:
  Jet and dijet rates in pA collisions at LHC energies are computed using a NLO
Monte Carlo code. Uncertainties due to the choice of scale, jet-finding
algorithm, nucleon parton densities and nuclear modifications of nucleon parton
densities are analyzed. Predictions for different pA collisions at LHC energies
are presented.


title: Jet and Dijet Rates in AB Collisions

abstract:
  Jet and dijet rates in AB collisions at LHC energies are computed using a NLO
Monte Carlo code. Uncertainties due to nuclear modifications of nucleon parton
densities are analyzed. Predictions for different AB collisions at LHC energies
are presented.


title: The LOW Solution and Two-zero Textures of the Neutrino Mass Matrix

abstract:
  As a viable alternative to the LMA solution to the solar neutrino problem,
the LOW solution is confronted with two-zero textures of the $3\times 3$
neutrino mass matrix. We find out nine acceptable textures, from which
instructive predictions can be obtained for the absolute values of neutrino
masses, Majorana phases of CP violation, and effective masses of the tritium
beta decay and neutrinoless double beta decay.


title: Particle Physics and Cosmology

abstract:
  In this talk I review the present status of inflationary cosmology and its
emergence as the basic paradigm behind the Standard Cosmological Model, with
parameters determined today at better than 10% level from CMB and LSS
observations.


title: Spin Physics at RHIC - a Theoretical Overview

abstract:
  We review how RHIC is expected to deepen our understanding of the spin
structure of longitudinally and transversely polarized nucleons. After briefly
outlining the current status of spin-dependent parton densities and pointing
out open questions, we focus on theoretical calculations and predictions
relevant for the RHIC spin program. Estimates of the expected statistical
accuracy for such measurements are presented, taking into account the
acceptance of the RHIC detectors.


title: Calculation of the Excitations of Dense Quark Matter at Zero Temperature

abstract:
  Recently there has been a great deal of interest in studying the properties
of dense quark matter, with particular reference to diquark condensates and
color superconductivity. In the present work we report calculations made for
the excitations of quark matter for relatively low densities of the deconfined
phase and in the absence of meson or diquark condensation. Here, we are
interested in elucidating the role of "Pauli blocking", as such blocking
affects the calculation vector, scalar and pseudoscalar $q\bar q$ excitations.
As a byproduct of our analysis, we extend our calculations to higher densities
and explore some consequences of the use of density-dependent coupling
parameters for the Nambu--Jona-Lasinio model. (Such density-dependent
parameters have been used in some of our previous work.) For our analysis made
at large values of the matter density, we assume that at about 13 times nuclear
matter density quark matter has only minimal nonperturbative interactions. At
that high density we compare the result for hadronic current correlation
functions calculated with density-dependent and density-independent NJL
coupling constants. We find evidence for the use of density-dependent
parameters, since the results with the density-independent constants do not go
over to the perturbative description which we assume to be correct for
$\rho\simeq 6\rho_c$, where $\rho_c$ is the matter density for the
finite-density confinement-deconfinement transition. The use of
density-dependent coupling constants in the study of diquark condensates and
color superconductivity has not been explored as yet, and is a topic requiring
further investigation, particularly given the strong interest in the properties
of dense quark matter and color superconductivity.


title:
Characteristic slepton signal in anomaly mediated SUSY breaking models
  via gauge boson fusion at the LHC

abstract:
  We point out that slepton pairs produced via gauge boson fusion in anomaly
mediated supersymmetry breaking (AMSB) model have very characteristic and
almost clean signal at the Large Hadron Collider. In this article, we discuss
how one lepton associated with missing energy and produced in between two
high-$p_T$ and high-mass forward jets can explore quite heavy sleptons in this
scenario.


title:
How the nuclear Fermi motion plus a simple statistical model explains
  the EMC effect

abstract:
  We present calculation of influence caused by nucleon Fermi motion on the
parton distributions in nuclei. Our approach is based on the model where
momenta of valence partons have some primordial distribution inside the hadron
at rest, which is either provided by a statistical considerations or calculated
using spherically symmetric Gaussian distribution with a width derived from the
Heisenberg uncertainty relation. The sea parton contribution emerges from the
similar Gaussian distribution with a width dictated by the presence of virtual
pions in hadron. We show that the influence of Fermi motion changes
substantially the nucleonic structure function inside the nucleus in the right
direction and therefore should be considered seriously in all attempts devoted
to explain the experimentally observed EMC effect for $x_{Bj} > 0.1$.


title: The pressure of hot QCD up to g^6 ln(1/g)

abstract:
  The free energy density, or pressure, of QCD has at high temperatures an
expansion in the coupling constant g, known so far up to order g^5. We compute
here the last contribution which can be determined perturbatively, g^6 ln(1/g),
by summing together results for the 4-loop vacuum energy densities of two
different three-dimensional effective field theories. We also demonstrate that
the inclusion of the new perturbative g^6 ln(1/g) terms, once they are summed
together with the so far unknown perturbative and non-perturbative g^6 terms,
could potentially extend the applicability of the coupling constant series down
to surprisingly low temperatures.


title: What Next in Flavour Physics and CP Violation?

abstract:
  The future of flavour physics and CP violation in the quark, lepton and Higgs
sectors are discussed, particularly from the viewpoint of physics beyond the
Standard Model, such as supersymmetry. Current issues in B to pi^+ pi^-, phi
K_s and D^*+ D^*-, B_s physics and rare B decays are reviewed. The prospects
for seeing flavour and CP violation in the charged-lepton sector are discussed,
using the minimal supersymmetric seesaw model as a guide. Finally, the possible
consequences of CP violation in the Higgs sector are mentioned.


title: Models of Flavor with Discrete Symmetries

abstract:
  In an attempt to understand the observed patterns of lepton and quark masses,
models invoking a flavor symmetry $G_f$, under which the Standard Model
generations are charged, have been proposed. One particularly successful
symmetry, U(2), has been extensively discussed in the literature. The Yukawa
matrices in models based on this symmetry reproduce the observed mass ratios in
the lepton and quark sectors. The features of the symmetry that determine the
texture of the Yukawa matrices can be found in other symmetries as well. We
present a model based on a minimal, non-Abelian discrete symmetry that
reproduces the Yukawa matrices associated with U(2) theories of flavor. In
addition to reproducing the mass and mixing angle relations obtained in such
theories, the different representation structure of our new horizontal symmetry
allows for solutions to the solar and atmospheric neutrino problems.


title: Proton breakup in high-energy pA collisions from perturbative QCD

abstract:
  We argue that the distribution of hadrons near the longitudinal light-cone in
central high-energy pA collisions is computable in weak coupling QCD. This is
because the density of gluons per unit transverse area in the dense target at
saturation provides an intrinsic semi-hard momentum scale, Qs. We predict that
the longitudinal distribution of (anti-)baryons and mesons steepens with
increasing energy and atomic number of the target, and that the transverse
momentum distribution broadens. We show that the evolution of high moments of
the longitudinal net baryon distribution with Qs is determined by the anomalous
dimension gamma_qq.


title: Detection of Leptonic Dark Matter

abstract:
  Weakly interacting massive particles (WIMPs) are among the favored candidates
for cold dark matter in the universe. The phenomenology of supersymmetric WIMPs
has been quite developed during recent years. However, there are other
possibilities which have not been discussed as much. One example is a
right-handed massive neutrino, which has recently been proposed in the context
of a version of the Zee model for massive neutrinos. This TeV-scale, leptonic
WIMP (or LIMP, for short) may at first sight appear to be essentially
undetectable. However, we point out that the radiatively induced annihilation
rate into leptons and photons is bound to be substantial, and provides a
conspicuous gamma-ray signature for annihilations in the galactic halo. This
gives a window of opportunity for Air Cerenkov Telescopes with ability to
observe the galactic center, such as the HESS and CANGAROO arrays, and also for
the GLAST space telescope. In addition, the contribution to the positron cosmic
ray flux is in principle detectable, but this would require very strong local
density enhancements in the dark matter halo distribution.


title: Azimuthal Asymmetries: Access to Novel Structure Functions

abstract:
  One of the most interesting consequence of non-zero intrinsic transverse
momentum of partons in the nucleon is the nontrivial azimuthal dependence of
the cross section of hard scattering processes. Many of the observable
asymmetries contain unknown functions which provide essential information on
the quark and gluon structure. Several of them have been studied in the last
few years; we discuss their qualitative and quantitative features in
semi-inclusive DIS.


title: The processes $e^-e^+\to\gamma\gamma, Z \gamma, ZZ$ in SM and MSSM

abstract:
  We present the results of a complete analysis of the one loop electroweak
corrections to $e^-e^+\to\gamma\gamma, ~Z\gamma, ~ZZ$ in the Standard (SM) and
the Minimal Supersymmetric Standard Model (MSSM). A special emphasis is put on
the high energy behaviour of the various helicity amplitudes and the way the
logarithmic structure is generated. The large magnitude of these effects, which
induce striking differences between the SM and MSSM cases at high energies,
offers the possibility of making global tests which could check the consistency
of these models, and even decide whether any additional new physics is
required.


title: Multiloop calculations in HQET

abstract:
  Recently, algorithms for calculation of 3-loop propagator diagrams in HQET
and on-shell QCD with a heavy quark have been constructed and implemented.
These algorithms (based on integration by parts recurrence relations) reduce an
arbitrary diagram to a combination of a finite number of basis integrals. Here
I discuss various ways to calculate non-trivial bases integrals, either exactly
or as expansions in epsilon. Some integrals of these two classes are related to
each other by inversion, which provides a useful cross-check.


title: New indications on the Higgs boson mass from lattice simulations

abstract:
  The `triviality' of $\Phi^4_4$ has been traditionally interpreted within
perturbation theory where the prediction for the Higgs boson mass depends on
the magnitude of the ultraviolet cutoff $\Lambda$. This approach crucially
assumes that the vacuum field and its quantum fluctuations rescale in the same
way. The results of the present lattice simulation, confirming previous
numerical indications, show that this assumption is not true. As a consequence,
large values of the Higgs mass $m_H$ can coexist with the limit $\Lambda\to
\infty $. As an example, by extrapolating to the Standard Model our results
obtained in the Ising limit of the one-component theory, one can obtain a value
as large as $m_H=760 \pm 21$ GeV, independently of $\Lambda$.


title: Nonperturbative QCD: confinement and deconfinement

abstract:
  After a short exposition of field correlators in the QCD vacuum and the
recently discovered Casimir scaling phenomenon, the origin of confinement in
QCD is discussed and two possible mechanisms are suggested, which can be
checked by new lattice measurements. Screening of confinement due to sea quarks
is discussed and quantitatively explained. Deconfinement is introduced via the
colorelectric field evaporation and the transition temperature Tc is found
numerically in good agreement with lattice measurements. The Tc dependence on
Nc and nf is also predicted and agrees with the recent lattice data.


title:
SuSpect: a Fortran Code for the Supersymmetric and Higgs Particle
  Spectrum in the MSSM

abstract:
  We present the Fortran code SuSpect version 2.3, which calculates the
Supersymmetric and Higgs particle spectrum in the Minimal Supersymmetric
Standard Model (MSSM). The calculation can be performed in constrained models
with universal boundary conditions at high scales such as the gravity (mSUGRA),
anomaly (AMSB) or gauge (GMSB) mediated breaking models, but also in the
non-universal MSSM case with R-parity and CP conservation. Care has been taken
to treat important features such as the renormalization group evolution of
parameters between low and high energy scales, the consistent implementation of
radiative electroweak symmetry breaking and the calculation of the physical
masses of the Higgs bosons and supersymmetric particles taking into account the
dominant radiative corrections. Some checks of important theoretical and
experimental features, such as the absence of non desired minima, large
fine-tuning in the electroweak symmetry breaking condition, as well as
agreement with precision measurements can be performed. The program is user
friendly, simple to use, self-contained and can easily be linked with other
codes; it is rather fast and flexible, thus allowing scans of the parameter
space with several possible options and choices for model assumptions and
approximations.


title: The Neutrinoless Double Beta Decay: The Case for Germanium Detectors

abstract:
  An overview of the current status of Neutrinoless Double Beta Decay is
presented, emphasizing on the case of Germanium Detectors.


title: CP violation versus flavour in supersymmetric theories

abstract:
  We show that the quark flavour structure and CP violating phenomena are
strongly correlated in supersymmetric theories. For a generic pattern of
supersymmetry breaking the two broad categories of Yukawa couplings, democratic
and hierarchical textures, have entirely different phenomenological
implications. With hierarchical Yukawas, the rephasing invariant phase,
arg(V_us V_cb V_cb^* V_cs^*), in the CKM mixing matrix has to be of order
unity, while the SUSY CP violating phases are severely constrained by electric
dipole moments, giving rise to the so-called SUSY CP problem. With democratic
Yukawas, all experimental CP results can be accommodated with small values for
the CKM and SUSY CP violating phases (i.e., CP can be considered as an
approximate symmetry at the high energy scale). We also show that within this
scenario, an entirely real CKM matrix in supersymmetric models is still allowed
by the present experimental results.


title: Maximal atmospheric neutrino mixing in an SU(5) model

abstract:
  We show that maximal atmospheric and large solar neutrino mixing can be
implemented in SU(5) gauge theories, by making use of the $U(1)_F$ symmetry
associated with a suitably defined family number $F$, together with a
$\mathbbm{Z}_2$ symmetry which does not commute with $F$. $U(1)_F$ is softly
broken by the mass terms of the right-handed neutrino singlets, which are
responsible for the seesaw mechanism; in addition, $U(1)_F$ is also
spontaneously broken at the electroweak scale. In our scenario, lepton mixing
stems exclusively from the right-handed-neutrino Majorana mass matrix, whereas
the CKM matrix originates solely in the up-type-quark sector. We show that,
despite the non-supersymmetric character of our model, unification of the gauge
couplings can be achieved at a scale $10^{16} \mathrm{GeV} < m_U < 10^{19}
\mathrm{GeV}$; indeed, we have found a particular solution to this problem
which yields results almost identical to the ones of the Minimal Supersymmetric
Standard Model.


title: The Top Quark: Experimental Roots and Branches of Theory

abstract:
  The CDF and D0 experiments at the Fermilab Tevatron have discovered the top
quark and provided first measurements of many of its properties. The small top
sample gathered by Run I leaves open many possibilities for top physics beyond
the standard model. Run II and the LHC (and eventually an LC) promise to deepen
our knowledge of the top quark and its relationship to electroweak symmetry
breaking.


title: Coherence Effects in Diffractive Electroproduction from Nuclei

abstract:
  We argue that study of the cross section of coherent photo(electro)
production of $\rho,\rho^{\prime}, ...$-mesons provides an effective method to
probe onset of black body limit(BBL) in the soft and hard QCD interactions. We
illustrate the expected features of the onset of BBL using generalized vector
dominance model(GVDM). We show that this model describes very well $\rho$-meson
coherent photoproduction at $6 \leq E_{\gamma} \leq 10$ GeV. The advantages of
the process of coherent dijet production and hard diffractive processes in
general for probing the onset of BBL and measuring the light-cone wave function
of the photon in a hard scattering regime where decomposition over twists
becomes inapplicable are explained. We argue also that the regime of color
fluctuations manifests itself at intermediate energies in exclusive and
semiexclusive photoproduction of vector mesons and that the color
transparency(CT) should reveal itself in these processes at $Q^2$ of the order
of a few GeV$^2$.


title: Hadron Spectra and QGP Hadronization in Au+Au Collisions at RHIC

abstract:
  The transverse mass spectra of Omega hyperons and phi mesons measured
recently by STAR Collaboration in Au+Au collisions at sqrt(s_NN) = 130 GeV are
described within a hydrodynamic model of the quark gluon plasma expansion and
hadronization. The flow parameters at the plasma hadronization extracted by
fitting these data are used to predict the transverse mass spectra of J/psi and
psi' mesons.


title: Neutrino Mass Matrix and Hierarchy

abstract:
  We build a model to describe neutrinos based on strict hierarchy,
incorporating as much as possible, the latest known data, for $\Delta_{sol}$
and $\Delta_{atm}$, and for the mixing angles determined from neutrino
oscillation experiments, including that from KamLAND. Since the hierarchy
assumption is a statement about mass ratios, it lets us obtain all three
neutrino masses. We obtain a mass matrix, $M_\nu$ and a mixing matrix, $U$,
where both $M_\nu$ and $U$ are given in terms of powers of $\Lambda$, the
analog of the Cabibbo angle $\lambda$ in the Wolfenstein representation, and
two parameters, $\rho$ and $\kappa$, each of order one. The expansion
parameter, $\Lambda$, is defined by $\Lambda^2 = m_2/m_3 = \surd
(\Delta_{sol}/\Delta_{atm}) \approx$ 0.16, and $\rho$ expresses our ignorance
of the lightest neutrino mass $m_1, (m_1 = \rho \Lambda^4 m_3$), while $\kappa$
scales $s_{13}$ to the experimental upper limit, $s_{13} = \kappa \Lambda^2
\approx 0.16 \kappa$. These matrices are similar in structure to those for the
quark and lepton families, but with $\Lambda$ about 1.6 times larger than the
$\lambda$ for the quarks and charged leptons. The upper limit for the effective
neutrino mass in double $\beta$-decay experiments is $4 \times 10^{-3} eV$ if
$s_{13} = 0$ and $6 \times 10^{-3} eV$ if $s_{13}$ is maximal. The model, which
is fairly unique, given the hierarchy assumption and the data, is compared to
supersymmetric extension and texture zero models of mass generation.


title: Strong coupling constant to four loops in the analytic approach to QCD

abstract:
  The QCD analytic running coupling alpha_{an} which has no nonphysical
singularities for all Q^2>0 is considered for the initial perturbation theory
approximations up to four loop order. The finiteness of the analytic coupling
at zero is shown to be a consequence of the asymptotic freedom property of the
initial theory. The nonperturbative contributions to the analytic coupling are
extracted explicitly. For all Q>Lambda they are represented in the form of an
expansion in inverse powers of Euclidean momentum squared. The effective method
for a precise calculation of the analytic running coupling is developed on the
basis of the stated expansion. The energy scale evolution of the analytic
running coupling for the one- to four-loop cases is studied and the higher loop
stability and low dependence on the quark threshold matching conditions in
comparison with the perturbative running coupling were found. Normalizing the
analytic running coupling at the scale of the rest mass of the Z boson with the
world average value of the strong coupling constant,
alpha_{an}(M_Z^2)=0.1181^{+0.002}_{-0.002}, one obtains as a result of the
energy scale evolution of the analytic running coupling alpha_{an}(M_tau^2)=
0.2943^{+0.0111}_{-0.0106} that is notably lower than the estimations of the
coupling strength available at the scale of the mass of the tau lepton.


title: Lattice results relevant to the CKM matrix determination

abstract:
  A brief discussion of the recent lattice studies of the quantities that are
relevant to the Standard Model description of CP-violation in the hadronic
sector is presented. A comment on B-->K* gamma decay is made too.


title: On the Effective Mass of the Electron Neutrino in Beta Decay

abstract:
  In the presence of mixing between massive neutrino states, the distortion of
the electron spectrum in beta decay is, in general, a function of several
masses and mixing angles. For $3\nu$-schemes which describe the solar and
atmospheric neutrino data, this distortion can be described by a single
effective mass, under certain conditions. In the literature, two different
definitions for the effective mass have been suggested. We show that for
quasi-degenerate mass schemes (with an overall mass scale $m$ and splitting
$\Delta m^2$) the two definitions coincide up to $(\Delta m^2)^2/m^4$
corrections. We consider the impact of different effective masses on the
integral energy spectrum. We show that the spectrum with a single mass can be
used also to fit the data in the case of $4\nu$-schemes motivated, in
particular, by the LSND results. In this case the accuracy of the mass
determination turns out to be better than $(10 - 15)%$.


title: Indirect Detection of Kaluza-Klein Dark Matter

abstract:
  We investigate prospects for indirect detection of Kaluza--Klein dark matter,
focusing on the annihilation radiation of the first Kaluza--Klein excitation of
the Hypercharge gauge boson $B^{(1)}$ in the Galactic halo, in particular we
estimate neutrino, gamma-ray and synchrotron fluxes. Comparing the predicted
fluxes with observational data we are able to constrain the $B^{(1)}$ mass (and
therefore the compactification scale). The constraints depend on the specific
model adopted for the dark matter density profile. For a NFW profile the
analysis of synchrotron radiation puts a lower bound on the $B^{(1)}$ mass of
the order of $\simeq 300$ GeV.


title: H^+ -> W^+ l_i^- l_j^+$ decay in the two Higgs doublet model

abstract:
  We study the lepton flavor violating H^+ -> W^+ l_i^- l_j^+ and the lepton
flavor conserving $H^+ -> W^+ l_i^- l_i^+ (l_i=\tau, l_j=\mu) decays in the
general 2HDM, so called model III. We estimate the decay width \Gamma for LFV
(LFC) at the order of the magnitude of (10^{-11}-10^{-5}) GeV
  ((10^{-9}-10^{-4}) GeV), for 200 GeV\leq m_{H^\pm}\leq 400
  GeV, and the intermediate values of the coupling
  \bar{\xi}^{E}_{N,\tau \mu}\sim 5 GeV (\bar{\xi}^{E}_{N,\tau
  \tau}\sim 30 GeV). We observe that the experimental result of the process
under consideration can give comprehensive information about the physics beyond
the standard model and the existing free parameters.


title: Two-loop corrections to $gg \to \gamma \gamma$

abstract:
  An overview of the calculation of the two-loop helicity amplitudes for
scattering of two gluons into two photons is presented. These matrix elements
enter into the recent improved calculation of the QCD background to Higgs boson
decay into a pair of photons, which is the preferred search mode at the LHC for
the case of a light Higgs boson.


title: Electroweak Radiative Corrections to Semileptonic Tau Decays

abstract:
  I present an update on the electroweak radiative correction factor to
semileptonic tau decays, including a next-to-leading order resummation of large
logarithms. My result differs both qualitatively and quantitatively from the
one recently obtained by Davier et al. As two consequences, (i) the discrepancy
between the predictions for the muon g-2 based on tau decay data and
electron-positron annihilation data increases, and (ii) the g-2 prediction
based on tau decay data appears to be consistent (within about one standard
deviation) with the experimental result from BNL.


title: Atmospheric neutrino mixing and b-tau Unification

abstract:
  Extrapolating the tau and b masses in the MSSM tends to give for their ratio
at the GUT scale a number around 1.2, for most viable values \tan \beta, rather
than the minimal SU(5) prediction of 1. We suggest that this may be due to
large off-diagonal elements in the charged lepton mass matrix M_L that can also
explain the large atmospheric neutrino mixing angle. Several simple models with
definite predictions for m_{tau}/m_b(M_{GUT}) are presented.


title:
Flavor violation in supersymmetric theories with gauged flavor
  symmetries

abstract:
  In this paper we study flavor violation in supersymmetric models with gauged
flavor symmetries. There are several sources of flavor violation in these
theories. The dominant flavor violation is the tree-level $D$-term contribution
to scalar masses generated by flavor symmetry breaking. We present a new
approach for suppressing this phenomenologically dangerous effects by
separating the flavor-breaking sector from supersymmetry-breaking one. The
separation can be achieved in geometrical setups or in a dynamical way. We also
point out that radiative corrections from the gauginos of gauged flavor
symmetries give sizable generation-dependent masses of scalars. The gaugino
mass effects are generic and not suppressed even if the dominant $D$-term
contribution is suppressed. We also analyze the constraints on the flavor
symmetry sector from these flavor-violating corrections.


title: QCD Saturation and $\gamma^*-\gamma^*$ Scattering

abstract:
  Two photon collisions at high energy have an important theoretical advantage:
the simplicity of the initial state, which gives us a unique opportunity to
calculate these processes for large virtualities of both photons in
perturbative QCD approach. In this paper we study QCD saturation in two photon
collisions in the framework of the Glauber-Mueller approach. The
Glauber-Mueller formula is derived emphasizing the impact parameter dependence
($b_t$) of the dipole-dipole amplitude. It is shown that non-perturbative QCD
contributions are needed to describe large $b_t $-behaviour, and the way how to
deal with them is suggested. Our approach can be viewed as the model for the
saturation in which the entire impact parameter dependence is determined by the
initial conditions. The unitarity bound for the total cross section, its energy
dependence as well aspredictions for future experiments are discussed.It is
argued that the total cross section increases faster than any power of $
\log(1/x)$ in a wide range of energy or $x$, namely $\sigma(\gamma^*-\gamma^*)
  \propto (1/Q^2) exp(a \sqrt{\ln(1/x)}) \leq 1/m^2_{\pi}$ where $exp(a
\sqrt{\ln(1/x)})$ reflects the $x$ dependence of the gluon density $xG \propto
exp(2 a \sqrt{\ln(1/x)})$ and $m_{\pi}$ is the pion mass.


title: Self-Similar Structures and Fractal Transforms in Approximation Theory

abstract:
  An overview is given of the methods for treating complicated problems without
small parameters, when the standard perturbation theory based on the existence
of small parameters becomes useless. Such complicated problems are typical of
quantum physics, many-body physics, physics of complex systems, and various
aspects of applied physics and applied mathematics. A general approach for
dealing with such problems has been developed, called Self-Similar
Approximation Theory. A concise survey of the main ideas of this approach is
presented, with the emphasis on the basic notion of group self-similarity. The
techniques are illustrated by examples from quantum field theory.


title:
An Introduction to the Evaluation of Spin Structure Functions from
  Experimental Data

abstract:
  These lectures introduce the non-specialist to the evaluation of spin
structure functions from asymmetries measured in polarized deep-inelastic
scattering experiments. The various steps leading from apparatus dependent
counting rate asymmetries to physics asymmetries are described. Special
attention is given to the effects of time variation in detector acceptances, to
the use of deuterium as a neutron target and to the corrections due to the
presence of unpolarized material in a polarized target. These topics are
illustrated by examples taken from the CERN muon experiments.


title: Progress in multiloop calculations

abstract:
  I briefly summarize the talks on calculation of multiloop Feynman diagrams
presented at ACAT'2002 (Moscow University).


title: NLO QCD corrections to t anti-t H production in hadron collisions

abstract:
  The Higgs boson H of the Standard Model can be searched for in the channels p
pbar / pp -> t tbar H + X at the Tevatron and the LHC. The cross sections for
these processes and the final-state distributions of the Higgs boson and top
quarks are presented at next-to-leading order QCD. To calculate these QCD
corrections, a special calculational technique for pentagon diagrams has been
developed and the dipole subtraction formalism has been adopted for massive
particles. The impact of the corrections on the total cross sections is
characterized by K factors, the ratios of the cross sections in next-to-leading
order over leading order QCD. At the central scale mu_0 = (2 m_t + M_H)/2 the K
factors are found to be slightly below unity for the Tevatron (K \sim 0.8) and
slightly above unity for the LHC (K \sim 1.2). Including the corrections
significantly stabilizes the theoretical predictions for total cross sections
and for the distributions in rapidity and transverse momentum of the Higgs
boson and top quarks.


title:
The Equivalence Theorem for gauge boson scattering in a five dimensional
  Standard Model

abstract:
  We present an Equivalence Theorem for the longitudinal components of the
gauge bosons in a compactified five dimensional extension of the Standard
Model, whose spontaneous symmetry breaking is driven either by one Higgs in the
bulk or by one on a brane or by both togheter. We also show some implications
for the unitarity bounds on Higgs masses.


title:
Status of a Supersymmetric Flavour Violating Solution to the Solar
  Neutrino Puzzle with Three Generations

abstract:
  We present a general study of a three neutrino flavour transition model based
on the supersymmetric interactions which violate R-parity. These interactions
induce flavour violating scattering reactions between solar matter and
neutrinos. The model does not contain any vacuum mass or mixing angle for the
first generation neutrino. Instead, the effective mixing in the first
generation is induced via the new interactions. The model provides a natural
interpretation of the atmospheric neutrino anomaly, and is consistent with
reactor experiments. We determine all R-parity violating couplings which can
contribute to the effective neutrino oscillations, and summarize the present
laboratory bounds. Independent of the specific nature of the (supersymmetric)
flavour violating model, the experimental data on the solar neutrino rates and
the recoil electron energy spectrum are inconsistent with the theoretical
predictions. The confidence level of the $\chi^2$-analysis ranges between $\sim
10^{-4}$ and $\sim 10^{-3}$. The incompatibility, is due to the new SNO
results, and excludes the present model. We conclude that a non-vanishing
vacuum mixing angle for the first generation neutrino is necessary in our
model. We expect this also to apply to the solutions based on other flavour
violating interactions having constraints of the same order of magnitude.


title: Signals for Majorana neutrinos in a $\gamma \gamma$ collider

abstract:
  We study the possibilities to detect Majorana neutrinos in
  $\gamma \gamma$ colliders for different center of mass energies.
  We study the $W^\pm W^\pm l_j^{\mp} l_k^{\mp}$ ($l_j\equiv e ,\mu ,\tau$)
final states which are, due to leptonic number violation, a clear signature for
intermediate Majorana neutrino contribution. Such a signal (final dileptons of
the same sign) is not possible if the heavy neutrinos are Dirac particles. We
present our results for the total cross-section as a function of the neutrino
mass and the center of mass energies.


title: Relativistic Study of Mesonic Baryon Resonance Decays

abstract:
  Mesonic baryon resonance decays are calculated from constituent quark models
along a Poincar\'e-invariant generalization of the elementary emission model.
Covariant results of pionic decay widths are presented for the
Goldstone-boson-exchange constituent quark model.


title: SUSY Calculation Tools

abstract:
  I discuss the various available tools for the study of the properties of the
new particles predicted in the Minimal Supersymmetric extension of the Standard
Model. Emphasis will be put on the codes for the determination of the sparticle
and Higgs boson spectrum. Codes for the calculation of production cross
sections, decay widths and branching ratios, Dark Matter relic density and
detection rates, as well as codes for automatic analytical calculations and
Monte-Carlo event generators for Supersymmetric processes will be briefly
discussed.


title:
Multipole-expanded soft-collinear effective theory with non-abelian
  gauge symmetry

abstract:
  In position space the interaction terms of soft-collinear effective theory
must be multipole-expanded to obtain interaction terms with homogeneous scaling
behaviour. In this note we provide a manifestly gauge-invariant formulation of
the theory after this expansion in the presence of non-abelian gauge fields,
extending our previous result. We give the effective Lagrangian (including the
Yang-Mills Lagrangian for collinear and ultrasoft gluons) and heavy-to-light
transition currents to second order in the power expansion, paying particular
attention to the field redefinitions that lead to the gauge symmetries of the
effective Lagrangian.


title: Phenomenology from lattice QCD

abstract:
  After a short presentation of lattice QCD and some of its current practical
limitations, I review recent progress in applications to phenomenology.
Emphasis is placed on heavy-quark masses and on hadronic weak matrix elements
relevant for constraining the CKM unitarity triangle. The main numerical
results are highlighted in boxes.


title:
SU(3) Predictions for Weak Decays of Doubly Heavy Baryons -- including
  SU(3) breaking terms

abstract:
  We find expressions for the weak decay amplitudes of baryons containing two b
quarks (or one b and one c quark -- many relationship are the same) in terms of
unknown reduced matrix elements. This project was originally motivated by the
request of the FNAL Run II b Physics Workshop organizers for a guide to
experimentalists in their search for as yet unobserved hadrons. We include an
analysis of linear SU(3) breaking terms in addition to relationships generated
by unbroken SU(3) symmetry, and relate these to expressions in terms of the
complete set of possible reduced matrix elements.


title: DGLAP evolution extends the triple pole pomeron fit

abstract:
  We show that the triple pole pomeron model \cite{CMS} provides an initial
condition for a DGLAP evolution \cite{DGLAP} that produces a fit to high $Q^2$
experimental DIS data. We obtain good $\chi^2$ for initial scales down to 3
GeV$^2$. Values of the initial scale smaller than 1.45 GeV$^2$ are ruled out at
the 90% confidence level.


title: Limit on Quark-Antiquark Mass Difference from the Neutral Kaon System

abstract:
  We quantify the limits on quark-antiquark mass differences imposed by the
neutral kaon mass system. In particular, we find that an upper limit to the
mass difference of 10^{-3} eV exists if mass differences across quark flavors
are uncorrelated. In the upcoming antihydrogen experiments this limit on quark
mass difference would allow a measurement of electron-positron mass difference
up to a relative precision level of 10^{-15}.


title:
From DIS to proton-nucleus collisions in the Color Glass Condensate
  model

abstract:
  We show that particle production in proton-nucleus (pA) collisions in the
Color Glass Condensate model can be related to Deep Inelastic Scattering of
leptons on protons/nuclei (DIS). The common building block is the quark
antiquark (or gluon-gluon) dipole cross section which is present in both DIS
and pA processes. This correspondence in a sense generalizes the standard
leading twist approach to pA collisions based on collinear factorization and
perturbative QCD, and allows one to express the pA cross sections in terms of a
universal quantity (dipole cross section) which, in principle, can be measured
in DIS or other processes. Therefore, using the parameterization of dipole
cross section at HERA, one can calculate particle production cross sections in
proton-nucleus collisions at high energies. Alternatively, one could use
proton-nucleus experiments to further constrain models of the dipole
cross-section. We show that the McLerran-Venugopalan model predicts enhancement
of cross sections at large p_t (Cronin effect) and suppression of cross
sections at low p_t. The cross over depends on rapidity and moves to higher p_t
as one goes to more forward rapidities.


title:
Free parameters in quantum field theories: an analysis of the
  variational approach

abstract:
  The usual renormalization procedure for the variational approximation with a
trial Gaussian ansatz for the $\lap$ model in 3+1 dimensions is re-analysed as
a departing framework for the investigation of the parameters of the model. The
so-called asymmetric phase of the model (where $<vac|\phi |vac> \neq 0$) is
considered for the search of privileged values of these parameters (mass and
coupling constant) and possible conditions they may be expected to satisfy.
This also may yield a suitable approach for the investigation of the
reliability and stability of the approximation. The extremization of the
renormalized energy density with relation to the renormalized mass, coupling
and $\bphi$ is done. The minimizations of the renormalized energy with relation
to the mass and $\bphi$ provide different expressions from the ones obtained by
the usual variational procedure for the regularized theory. Sort of ``energy
scale'' invariances in expressions for the renormalized mass and coupling
constant are found. A different view on the restoration of symmetry issue is
discussed. The transcendental character of the GAP equation may be reduced or
even eliminated by placing some variables in the complex plane.


title:
Charge Conjugation and Parity Violations as a Signature for Black Hole
  Formation in Hadron Collisions

abstract:
  Black hole formation (BHF) in hadron collisions is a subject of great
interest. Hard quark-quark collisions are generally associated with the
production of particles at large transverse momenta or with high
multiplicities. If BHF occurs, we might expect large violations of baryon
number, charge conjugation (C), parity (P), strangeness, isospin, etc. in such
processes. C and P have not been well tested in hadronic interactions. I
propose new tests of C and P that can be adapted to a variety of BHF scenarios.
These may provide more sensitive searches for BHF or other new physics at
existing colliders.


title:
Complete two-loop effective potential approximation to the lightest
  Higgs scalar boson mass in supersymmetry

abstract:
  I present a method for accurately calculating the pole mass of the lightest
Higgs scalar boson in supersymmetric extensions of the Standard Model, using a
mass-independent renormalization scheme. The Higgs scalar self-energies are
approximated by supplementing the exact one-loop results with the second
derivatives of the complete two-loop effective potential in Landau gauge. I
discuss the dependence of this approximation on the choice of renormalization
scale, and note the existence of particularly poor choices which fortunately
can be easily identified and avoided. For typical input parameters, the
variation in the calculated Higgs mass over a wide range of renormalization
scales is found to be of order a few hundred MeV or less, and is significantly
improved over previous approximations.


title: General Structure of Relativistic Vector Condensation

abstract:
  We study relativistic massive vector condensation due to a non zero chemical
potential associated to some of the global conserved charges of the theory. We
show that the phase structure is very rich. More specifically there are three
distinct phases depending on the value of one of the zero chemical potential
vector self interaction terms. We also develop a formalism which enables us to
investigate the vacuum structure and dispersion relations in the spontaneously
broken phase of the theory. We show that in a certain limit of the couplings
and for large chemical potential the theory is not stable. This limit,
interestingly, corresponds to a gauge type limit often employed to economically
describe the ordinary vector mesons self interactions in QCD. We finally
indicate for which physical systems our analysis is relevant.


title:
Lepton Flavour Violation in the Constrained MSSM with Natural Neutrino
  Mass Hierarchy

abstract:
  We present predictions for $\mu \to e \gamma$ and $\tau \to \mu \gamma$ in
the CMSSM in which there is a natural hierarchy of neutrino masses resulting
from the sequential dominance of three right-handed neutrinos. We perform a
global analysis of this model in the $(m_0,M_{1/2})$ plane, assuming radiative
electroweak symmetry breaking, and including all observed laboratory data. We
confirm that a large (small) $\tau \to \mu \gamma$ rate results from the
dominant right-handed neutrino being the heaviest (lightest) one. We show that
the $\mu \to e \gamma$ rate may determine the order of the sub-dominant
neutrino Yukawa couplings in the flavour basis, but may also be sensitive to
effects beyond the leading log and leading mass insertion approximations. We
also show that the $\mu \to e \gamma$ rate is independent of $\theta_{13}$, but
measurement of this angle may determine a ratio of sub-dominant Yukawa
couplings.


title: Preheating in Supersymmetric Theories

abstract:
  We examine the particle production via preheating at the end of inflation in
supersymmetric theories. The inflaton and matter scalars are now necessarily
complex fields, and their relevant interactions are restricted by holomorphy.
In general this leads to major changes both in the inflaton dynamics and in the
efficiency of the preheating process. In addition, supersymmetric models
generically contain multiple isolated vacua, raising the possibility of
non-thermal production of dangerous topological defects. Because of these
effects, the success of leptogenesis or WIMPZILLA production via preheating
depends much more sensitively on the detailed parameters in the inflaton sector
than previously thought.


title: Mass predictions based on a supersymmetric SU(5) fixed point

abstract:
  I examine the possibility that the third generation fermion masses are
determined by an exact fixed point of the minimal supersymmetric SU(5) model.
When one-loop supersymmetric thresholds are included, this unified fixed point
successfully predicts the top quark mass, 175 +(-) 2 GeV, as well as the weak
mixing angle. The bottom quark mass prediction is sensitive to the
supersymmetric thresholds; it approaches the measured value for mu <0 and very
large unified gaugino mass. The experimental measurement of the tau lepton mass
determines tan(beta), and the strong gauge coupling and fine structure constant
fix the unification scale and the unified gauge coupling.


title: Two-Higgs-Doublet Models with CP violation

abstract:
  We consider the Two-Higgs-Doublet Model and determine the range of parameters
for which CP violation and Flavor Changing Neutral Current effects are
naturally small. It corresponds to small values of the mass parameter m_{12}^2,
describing soft (\phi_1,\phi_2) mixing in the potential. We discuss how, in
this approach, some Higgs bosons can be heavy, with mass of the order of 1 TeV.
  The possibility that at the Tevatron, LHC and an e^+e^- Linear Collider, only
one Higgs boson will be found, with properties indistinguishable from those in
the Standard Model (SM), we define as the SM-like scenario. While this scenario
can be obtained with large \mu^2 \sim \Re m_{12}^2 parameter, in which case
there is decoupling, we here discuss the opposite case of small \mu^2, without
decoupling.


title: Radion Induced Baryogenesis

abstract:
  Recent work in two brane Randall-Sundrum models has shown that the radion can
drive parametric amplification of particles on the TeV brane leading to a stage
of cosmology similar to preheating. We consider radion induced preheating as a
mechanism for electroweak scale baryogenesis and estimate the baryon to entropy
ratio for some regions of parameter space. We also predict an upper bound for
the radion mass which makes this baryogenesis mechanism testable. Finally, we
verify some assumptions with numerical calculations of the 1+1 dimensional
Abelian Higgs model.


title:
NLO QCD Predictions for associated t-tbar-h production in Hadronic
  Collisions

abstract:
  We present the next-to-leading-order (NLO) QCD corrections to the inclusive
total cross section for the production of a Higgs boson in association with a
top anti-top quark pair within the Standard Model at the Tevatron and the LHC.


title:
Transverse Polarization Signatures of Extra Dimensions at Linear
  Colliders

abstract:
  If significant longitudinal polarization of both the electrons and positrons
becomes feasible at a future linear collider(LC), it may be possible to use
spin rotators to produce transversely polarized beams. Using the transverse
polarization of both beams, new azimuthal spin asymmetries can be formed which
will be sensitive probes for new physics beyond the Standard Model. Here we
demonstrate that these asymmetries are particularly sensitive to the exchange
of Kaluza-Klein towers of gravitons, or other spin-2 fields, that are predicted
to exist in higher dimensional theories which address the hierarchy problem.
These new asymmetries are shown to be able to extend the search reach for such
new physics by more than a factor of two, provide an additional tool for
isolating the signatures for spin-2 exchange up to mass scales in excess of
$10\sqrt s$, and can be used to help differentiate among the proposed solutions
to the hierarchy problem below the production threshold for new particles.


title:
Bounds on the Coupling of the Majoron to Light Neutrinos from Supernova
  Cooling

abstract:
  We explore the role of Majoron ($J$) emission in the supernova cooling
process, as a source of upper bound on neutrino-Majoron coupling.
  We show that the strongest upper bound on the coupling to $\nu_e$ comes from
the $\nu_e\nu_e \to J $ process in the core of a supernova. We also find bounds
on diagonal couplings of the Majoron to $\nu_{\mu(\tau)}\nu_{\mu(\tau)}$ and on
off-diagonal $\nu_e \nu_{\mu (\tau)}$ couplings in various regions of the
parameter space. We discuss the evaluation of the cross-section for
four-particle interactions ($\nu \nu \to JJ$ and $\nu J \to \nu J$). We show
that these are typically dominated by three-particle sub-processes and do not
give new independent constraints.


title: Matching functions for heavy particles

abstract:
  We introduce matching functions as a means of summing heavy-quark logarithms
to any order. Our analysis is based on Witten's approach, where heavy quarks
are decoupled one at a time in a mass-independent renormalization scheme. The
outcome is a generalization of the matching conditions of Bernreuther and
Wetzel: we show how to derive closed formulas for summed logarithms to any
order, and present explicit expressions for leading order and next-to-leading
order contributions. The decoupling of heavy quarks in theories lacking
asymptotic freedom is also considered.


title: Phenomenology on a Slice of $AdS_5 \times {\cal M}^\delta$ Spacetime

abstract:
  We study the phenomenology resulting from backgrounds of the form $AdS_5
\times {\cal M}^\delta$, where ${\cal M}^\delta$ denotes a generic manifold of
dimension $\delta \geq 1$, and $AdS_5$ is the slice of 5-dimensional anti-de
Sitter space which generates the hierarchy in the Randall-Sundrum (RS) model.
The $\delta$ additional dimensions may be required when the RS model is
embedded into a more fundamental theory. We analyze two classes of
$\delta-$dimensional manifolds: flat and curved geometries. In the first case,
the additional flat dimensions may accommodate localized fermions which in turn
could resolve issues, such as proton decay and flavor, that were not addressed
in the original RS proposal. In the latter case, the positive curvature of an
$S^\delta$ manifold with $\delta> 1$ can geometrically provide the
5-dimensional warping of the RS model. We demonstrate the key features of these
two classes of models by presenting the background solutions, the spectra of
the Kaluza-Klein (KK) gravitons, and their 4-dimensional couplings, for the
sample manifolds $S^1/Z_2$, $S^1$, and $S^2$. The resulting phenomenology is
distinct from that of the original RS scenario due to the appearance of a
multitude of new KK graviton states at the weak scale with couplings that are
predicted to be measurably non-universal within the KK tower. In addition, in
the case of flat compactifications, fermion localization can result in KK
graviton and gauge field flavor changing interactions.


title: Predictive Framework with a Pair of Degenerate Neutrinos at a high scale

abstract:
  Radiative generation of the solar scale $\Delta_{\odot}$ is discussed in the
presence of leptonic CP violation. We assume that both the solar scale and
$U_{e3}$ are zero at a high scale and the weak radiative corrections generate
them. It is shown that all leptonic mass matrices satisfying these requirements
lead to a unique prediction $\Delta_{\odot} \cos 2\theta_{\odot}\approx 4
\delta_\tau \sin^2 \theta_A |m_{ee}|^2$ for the solar scale in terms of the
radiative correction parameter $\delta_\tau$, the physical solar (atmospheric)
mixing angles $\theta_{odot} (\theta_A)$ and the Majorana neutrino mass
$m_{ee}$ probed in neutrinoless double beta decay. This relation is independent
of the mixing matrix and CP-violating phases at the high scale. The presence of
CP-violating phases leads to dilution in the solar mixing angle defined at the
high scale. Because of this, bi-maximal mixing pattern at the high energy leads
to large but non-maximal solar mixing in the low-energy theory. An illustrative
model with this feature is discussed.


title: Charged pion pair production by two photons from a chiral sum rule

abstract:
  The cross-section for a charged pion pair production by two photons is
evaluated by using the low energy expression previously obtained from current
algebra and PCAC which involves an integral over a vector and axial-vector
spectral functions. Data on the latter obtained from tau-decay as measured by
the ALEPH collaboration is then inserted in the integral which is appropriately
modified in order to eliminate contributions near the cut in the duality
contour integral. The experimental behavior of the cross-section for
gamma-gamma into pi (+)-pi(-) is well reproduced at low energies.


title: Scalar and Pseudo-Scalar Higgs Production at Hadron Colliders

abstract:
  The evaluation of the NNLO QCD corrections to the production of a scalar and
a pseudo-scalar Higgs boson is described.


title:
Radiative Corrections to Radiative B Decays: Exclusive B -> V gamma at
  NLO

abstract:
  We discuss a model-independent framework for the analysis of the radiative
B-meson decays B -> K* gamma and B -> rho gamma based on the heavy-quark limit
of QCD. We present a factorization formula for the treatment of B -> V gamma
matrix elements involving charm (or up-quark) loops, which contribute at
leading power in Lambda_QCD/m_B to the decay amplitude. Annihilation topologies
are power suppressed, but still calculable in some cases. The framework of QCD
factorization is necessary to compute exclusive b -> s(d) gamma decays
systematically beyond the leading logarithmic approximation. Results to
next-to-leading order in QCD and to leading order in the heavy-quark limit are
given and phenomenological implications are discussed.


title:
Possibility of Measuring the CP-Violation gamma-parameter in Decays of
  Xi_bc Baryons

abstract:
  The model-independent method based on the triangle ideology is implemented to
extract the CKM-matrix angle gamma in the decays of doubly heavy baryons
containing the charmed and beauty quarks. We analyze a color structure of
diagrams and conditions for reconstructing two reference-triangles by tagging
the flavor and CP eigenstates of neutral D mesons in the fixed exclusive
channels. The characteristic branching ratios are evaluated in the framework of
a potential model setting a parametric dependence on the hadronic matrix
elements for the decay rates.


title: A Systematic Study of the Chirality-Mixing Interactions in QCD

abstract:
  We present a study of the QCD interactions which do not conserve the
chirality of quarks. These non-perturbative forces are responsible for the
violation of the U_A(1) charge conservation and for the breaking of chiral
symmetry. From a systematic analysis we argue that the leading dynamical
sources chirality flips are the interactions mediated by topological vacuum
field fluctuations. We study in detail the contribution of instantons and
derive a simple model-independent semi-classical prediction. This result can be
used to check on the lattice if instantons are the dynamical mechanism
responsible both for chiral symmetry breaking and for the anomalous violation
of the U_A(1) charge conservation.


title: Very Heavy MSSM Higgs-Boson Production at the Linear Collider

abstract:
  In the Minimal Supersymmetric Standard Model (MSSM) we present the
corrections to the heavy neutral CP-even Higgs-boson production in the
WW-fusion and Higgs-strahlung channel, e+e- -> \bar nu nu H, taking into
account all O(\alpha) corrections arising from loops of fermions and sfermions.
While the H boson shows decoupling behavior at the tree-level, we find
non-negligible loop corrections that can enhance the cross section
considerably. At a center-of-mass energy of \sqrt{s} = 1000 GeV, masses of up
to M_H <= 750 GeV are accessible at the LC in favorable regions of the MSSM
parameter space.


title: Dynamical Electroweak Symmetry Breaking by a Neutrino Condensate

abstract:
  We show that the electroweak symmetry can be broken in a natural and
phenomenologically acceptable way by a neutrino condensate. Therefore, we
assume as particle content only the chiral fermions and gauge bosons of the
Standard Model and in addition right-handed neutrinos. A fundamental Higgs
field is absent. We assume instead that new interactions exist that can
effectively be described as four-fermion interactions and that can become
critical in the neutrino sector. We discuss in detail the coupled
Dirac-Majorana gap equations which lead to a neutrino condensate, electroweak
symmetry breaking and via the dynamical see-saw mechanism to small neutrino
masses. We show that the effective Lagrangian is that of the Standard Model
with massive neutrinos and with a composite Higgs particle. The mass
predictions are consistent with data.


title:
Helicity-dependent Twist-two and Twist-three Generalized Parton
  Distributions in Light-front QCD

abstract:
  We investigate the helicity dependent twist-two and twist-three generalized
parton distributions in light-front Hamiltonian QCD for a massive dressed quark
target. Working in the kinematical region $\xi< x <1$, we obtain the splitting
functions for the evolutions of twist-two quark and gluon distributions in a
straightforward way. For the twist-three distribution, we find that all
contributions are proportional to the quark mass and thus the twist-three
distribution is directly related to the chiral symmetry breaking dynamics in
light-front QCD. We also show that the off-forward Wandzura-Wilczek relation is
violated in perturbative QCD for a massive dressed quark.We calculate the quark
mass correction to the WW relation in the off-forward case and show that it is
related to $h_1(x)$ in the forward limit. We extract the 'genuine twist three'
part of the matrix element in the forward case and verify the Burkhardt
Cottingham and Efremov-Leader-Teryaev sum rules.


title: Ratios of Antibaryon/Baryon Yields in Heavy Ion Collisions

abstract:
  We discuss the model predictions for antibaryon/baryon production ratios in
high energy heavy ion collisions. The role of string junction mechanism of
baryon number transfer seems to be very important here and we consider some
quantitative results.


title: Light-Cone Algebra, \pi^0 Decay and e^+ e^- Annihilation

abstract:
  The indication from deep inelastic electron scattering experiments at SLAC
that Bjorken scaling may really hold has motivated an extension of the
hypotheses of current algebra to what may be called light-cone current algebra.


title: Recent tests for the statistical parton distributions

abstract:
  We compare some recent experimental results obtained at DESY, SLAC and
Jefferson Lab., with the predictions of the statistical model, we have
previously proposed. The result of this comparison is very satisfactory.


title: Pentagon Integrals for Heavy Quark Physics

abstract:
  In this paper we present the calculation of a scalar pentagon integral with
two consecutive massive external legs having an equal mass propagator embedded
between them. We also deal with the two situations where the farest external
leg is either massive or not. The relevance of the calculation comes from its
application in many perturbative QCD calculations as well as in QCD corrections
for weak precesses.


title: Implications of a Massless Neutralino for Neutrino Physics

abstract:
  We consider the phenomenological implications of a soft SUSY breaking term BN
at the TeV scale (here B is the U(1)_Y gaugino and N is the right-handed
neutrino field). In models with a massless (or nearly massless) neutralino,
such a term will give rise through the see-saw mechanism to new contributions
to the mass matrix of the light neutrinos.
  We treat the massless neutralino as an (almost) sterile neutrino and find
that its mass depends on the square of the soft SUSY breaking scale, with
interesting consequences for neutrino physics. We also show that, although it
requires fine-tuning, a massless neutralino in the MSSM or NMSSM is not
experimentally excluded. The implications of this scenario for neutrino physics
are discussed.


title: Bootstraping the QCD Critical Point

abstract:
  It is shown that hadronic matter formed at high temperatures, according to
the prescription of the statistical bootstrap principle, develops a critical
point at nonzero baryon chemical potential. The location of the critical point
in the phase diagram, however, depends on the detailed knowledge of the
partition function of the deconfined phase, near the critical line. In a
simplified version of the quark-gluon partition function, the resulting
location of the critical point is compared with the solutions of other
approaches and in particular with the results of lattice QCD. The proximity of
our solution to the freeze-out area in heavy-ion experiments is also discussed.