title:
AcerDET: a particle level fast simulation and recosntruction package for
  phenomenological studies on high pT physics at LHC

abstract:
  This paper documents package for the particle level fast simulation. The
package is designed to complete the AcerMC generator framework with the
easy-to-use simulation and reconstruction algorithms. The package provides,
starting from list of particles in the event, the list of reconstructed jets,
isolated electrons, muons and photons and reconstructed missing transverse
energy. The AcerDET represents a simplified version of the package called
ATLFAST, used since several years within ATLAS Collaboration. In the AcerDET
version some functionalities of the former one have been removed, only the most
crucial detector effects are implemented and the parametrisations are largely
simplified. Therefore it is not representing in details neither ATLAS nor CMS
detectors. Nevertheless, we believe that the package can be well adequate for
some feasibility studies of the high pT physics at LHC and in future, after
some adjustments, of other detectors as well.


title: First hint of non-standard CP violation from B --> Phi K_S decay

abstract:
  We comment on the implications of the recently measured CP asymmetry in B -->
Phi K_S decay. The data disfavor the Standard Model at 2.7 sigma and -if the
trend persists in the future with higher statistics - require the existence of
CP violation beyond that in the CKM matrix. In particular, the b --> s bar{s} s
decay amplitude would require new contributions of comparable size to the
Standard Model ones with an order one phase. While not every model can deliver
such a large amount of CP and flavor violation, those with substantial FCNC
couplings to the Z can reproduce the experimental findings.


title: Moriond QCD 2002: Theoretical Summary

abstract:
  I summarize highlights of the theory talks presented at the 37th Rencontres
de Moriond on QCD and High Energy Hadronic Interactions.


title:
Baryon Charge Radii and Quadrupole Moments in the 1/N_c Expansion: The
  3-Flavor Case

abstract:
  We develop a straightforward method to compute charge radii and quadrupole
moments for baryons both with and without strangeness, when the number of QCD
color charges is N_c. The minimal assumption of the single-photon exchange
ansatz implies that only two operators are required to describe these baryon
observables. Our results are presented so that SU(3) flavor and isospin
symmetry breaking can be introduced according to any desired specification,
although we also present results obtained from two patterns suggested by the
quark model with gluon exchange interactions. The method also permits to
extract a number of model-independent relations; a sample is r^2_Lambda / r_n^2
= 3/(N_c+3), independent of SU(3) symmetry breaking.


title: What is the Real K Factor?

abstract:
  The theoretical K factor, describing the difference between the leading and
higher order cross sections, has no precise definition. The definition is
sensitive to the order of the fit to the parton densities and the number of
loops at which alpha_s is evaluated. We describe alternate ways to define the K
factor and show how the definition affects its magnitude and shape for examples
of hadroproduction of W^+ bosons, Drell-Yan lepton pairs, and heavy quarks. We
discuss which definition is appropriate under certain circumstances.


title: A review of self-tuning solutions of cosmological constant

abstract:
  The self-tuning solutions of the cosmological constant is reviewed, with the
emphasis on the recent attempts in extra dimensional gravity with a brane
boundary.


title:
A General Four-Fermion Effective Lagrangian for Dirac and Majorana
  Neutrino-Charged Matter Interactions

abstract:
  Given the most general Lorentz invariant four-fermion effective interaction
possible for two neutrinos and two charged fermions, whether quarks or leptons,
all possible 2-to-2 processes involving two neutrinos, whether Dirac or
Majorana ones, and two charged fermions are considered. Explicit and convenient
expressions are given for the associated differential cross-sections. Such a
parametrization should help assess the sensitivity to physics beyond the
Standard Model of neutrino beam experiments which are in the design stage at
neutrino factories.


title: Heavy Flavour Production

abstract:
  Recent progress in Heavy Flavour Production phenomenology are discussed. In
particular, the long-standing discrepancy of the Tevatron b production data is
considered. It is shown that a better use of e^+e^- data in constraining the
effect of fragmentation reduces the discrepancy considerably.


title:
Supersymmetric Electroweak Corrections to Heavier Top Squark Decay into
  Lighter Top Squark and Neutral Higgs Boson

abstract:
  We calculate the Yukawa corrections of order ${\cal
O}(\alpha_{ew}m_{t(b)}^2/m_W^2)$, ${\cal O}(\alpha_{ew}m_{t(b)}^3/m_W^3)$ and
${\cal O}(\alpha_{ew}m_{t(b)}^4/m_W^4)$ to the widths of the decays $\tilde
t_2\to \tilde t_1 + (h^0,H^0,A^0)$ in the Minimal Supersymmetric Standard
Model, and perform a detailed numerical analysis. We also compare the results
with the ones presented in an earlier literature, where the ${\cal
O}(\alpha_{s})$ SUSY-QCD corrections to the same three decay processes have
been calculated.
  Our numerical results show that for the decays $\tilde t_2\to \tilde t_1 +
h^{0}$, $\tilde t_2\to \tilde t_1 + H^{0}$, the Yukawa corrections are
significant in most of the parameter range, which can reach a few ten percent,
and for the decay $\tilde t_2\to\tilde t_1 + A^{0}$, the Yukawa corrections are
relatively smaller, which are only a few percent. The numerical calculations
also show that using the running quark masses and the running trilinear
coupling $A_t$, which include the QCD, SUSY-QCD, SUSY-Electroweak effects and
resume all high order ($\tan\beta$)-enhanced effects, can vastly improve the
convergence of the perturbation expansion. We also discuss the effects of the
running of the higgsino mass parameter $\mu$ on the corrections, and find that
they are significant, too, especially for large $\tan\beta$.


title: Fermionic decays of sfermions: a complete discussion at one-loop order

abstract:
  We present a definition of an on-shell renormalization scheme for the
sfermion and chargino-neutralino sector of the Minimal Supersymmetric Standard
Model (MSSM). Then, apply this renormalization framework to the interaction
between charginos/neutralinos and sfermions. A kind of universal corrections is
identified, which allow to define effective chargino/neutralino coupling
matrices. In turn, these interactions generate (universal) non-decoupling terms
that grow as the logarithm of the heavy mass. Therefore the full MSSM spectrum
must be taken into account in the computation of radiative corrections to
observables involving these interactions. As an application we analyze the full
one-loop electroweak radiative corrections to the partial decay widths
\Gamma(\tilde{f} -> f\neut) and \Gamma(\tilde{f} -> f'\cplus) for all sfermion
flavours and generations. These are combined with the QCD corrections to
compute the corrected branching ratios of sfermions. It turns out that the
electroweak corrections can have an important impact on the partial decay
widths, as well as the branching ratios, in wide regions of the parameter
space. The precise value of the corrections is strongly dependent on the
correlation between the different particle masses.


title:
A Z-Monitor to Calibrate Higgs Production via Vector Boson Fusion with
  Rapidity Gaps at the LHC

abstract:
  We study central Z-boson production accompanied by rapidity gaps on either
side as a way to gauge Higgs weak boson fusion production at the LHC. We
analyse the possible backgrounds for the bb-decay mode and show that these can
be substantially reduced. Special attention is paid to the evaluation of the
gap survival factor, which is the major source of theoretical uncertainty in
the rate of H, Z and W central production events with rapidity gaps.


title: Neutrino mass matrix: inverted hierarchy and CP violation

abstract:
  We reconstruct the neutrino mass matrix in flavor basis, in the case of
inverted mass hierarchy (ordering), using all available experimental data on
neutrino masses and oscillations. We analyze the dependence of the matrix
elements m_{alpha beta} on the CP violating Dirac, delta, and Majorana, rho and
sigma, phases, for different values of the absolute mass scale. We find that
the present data admit various structures of the mass matrix: (i) hierarchical
structures with a set of small (zero) elements; (ii) structures with equalities
among various groups of elements: e-row and/or mu tau-block elements, diagonal
and/or off-diagonal elements; (iii) ``democratic'' structure. We find values of
phases for which these structures are realized. The mass matrix elements can
anti-correlate with flavor: inverted partial or complete flavor alignment is
possible. For various structures of the mass matrix we identify possible
underlying symmetry. We find that the mass matrix can be reconstructed
completely only in particular cases, provided that the absolute scale of the
mass is measured. Generally, the freedom related to the Majorana phase sigma
will not be removed, thus admitting various types of mass matrix.


title:
Finite-Size Effects and Critical Behavior of the Deconfinement Phase
  Transition

abstract:
  We study the finite-size effects on the deconfinement phase transition (DPT)
of hot and / or dense hadronic matter, using a simple thermodynamic model based
on the assumption of coexistence of confined and deconfined phases in a finite
volume, with the two-phases matter Equations of State. For the QGP, we consider
a partition function (PF) with the exact color-singletness requirement. A
problem arises in the limit of small QGP volumes when using the usual
color-singlet partition function (CSPF) derived in the saddle point
approximation. To avoid the problem, we have then proposed a method for
calculating a suitable CSPF, which allows us to accurately calculate physical
quantities describing well the DPT at finite volumes. We show that in the limit
of infinite volume, these thermodynamic quantities exhibit a discontinuity at a
critical point Tc(infinity) (or muc(infinity)). In a finite size system, all
singularities are smoothed out over a broadened critical region, shifted from
the critical point position in the thermodynamic limit. The first derivatives
of these thermodynamic quantities show delta function singularities at the
critical point in the thermodynamic limit, while in a finite volume, these
delta singularities are smeared into finite peaks of widths deltaT(V) (or
deltamu(V)), with the maxima of the peaks occuring at pseudo-critical points
Tc(V) (or muc(V)). An analysis of the finite size scaling behavior at
criticality of these maxima as well as of the width of the transition region
and the shift of the critical point allows us to determine the critical
exponents characterizing the DPT. Our results are in good agreement with those
predicted by other studies for a first-order phase transition.


title: Neutron charge form factor and quadrupole deformation of the nucleon

abstract:
  A quark model relation between the neutron charge form factor and the
N->Delta charge quadrupole form factor is used to predict the C2/M1 ratio in
the N->Delta transition from the elastic neutron form factor data. Excellent
agreement with the electro-pionproduction data is found, indicating the
validity of the suggested relation. The implication of the negative C2/M1 ratio
for the intrinsic deformation of the nucleon is discussed.


title:
Can the Mechanism for $\pi_1\to \eta\pi,\eta'\pi$ Hybrid Decays be
  Detected?

abstract:
  Two mechanisms for the $\pi_1$ ($J^{PC}=1^{-+}$) hybrid meson decay processes
$\pi_1\to\eta\pi,\eta'\pi$ are investigated. These mechanisms are applied to
$\phi\to\eta\gamma,\eta'\gamma$ and $J/\psi\to\eta\gamma,\eta'\gamma$ decays to
illustrate the validity of the decay mechanisms and to obtain independent
information on the coupling of $\eta,\eta'$ to quark and gluonic operators.
  From this information, we find that
$\Gamma(\pi_1\to\eta\pi)/\Gamma(\pi_1\to\eta'\pi)$ is substantially different
in the two decay mechanisms, and hence future experimental measurements of this
ratio will provide valuable information for substantiating the hybrid nature of
these states and for determining the mechanism for these hybrid decays.


title:
Non-Zero Magnetic Screening Mass in QED and QCD at One Loop Level in
  Non-Equilibrium

abstract:
  Using the Schwinger-Keldysh closed time path integral formalism we show that
the magnetic screening mass in QED and QCD at one loop level is non-zero as
long as the single particle distribution function f(\vec{k}) is non-isotropic,
{i.e.} it depends on the direction of the momentum. For isotropic distribution
functions such as those corresponding to thermal equilibrium the magnetic
screening mass at one loop level is found to be zero which is consistent with
finite temperature field theory. The non-zero magnetic screening mass in
non-isotropic non-equlibrium situations has fundamental importance in that it
acts as a natural cut-off to remove infrared divergences in the magnetic
sector. Thus it allows one to avoid infrared problems which previously made it
difficult to use a transport theory approach using perturbative QCD or QED
scattering kernels to study the thermalization of a QED or QCD plasma.


title: Higher Twists and Nuclear Effects

abstract:
  We discuss the impact of nuclear effects on the higher twist terms using a
particular example of the structure function xF_3 as extracted from a QCD fit
to neutrino deep inelastic data on a heavy nucleus target.


title: SU(3) Mixing for Excited Mesons

abstract:
  The SU(3)-flavor symmetry breaking and the quark-antiquark annihilation
mechanism are taken into account for describing the singlet-octet mixing for
several nonets assigned by Particle Data Group(PDG). This task is approached
with the mass matrix formalism.


title: Testing leptonic SU(2) horizontal symmetry using neutrino mixings

abstract:
  After some preliminary arguments suggesting that neutrino mixings with
inverted mass pattern may be easier to understand within the framework of a
local horizontal symmetry SU(2)_H acting on leptons, we construct a specific
extension of the minimal supersymmetric standard model that implements the idea
and analyze its predictions. We show that the horizontal symmetry leads to an
experimentally testable relation between the neutrino parameters U_{e3} and the
ratio of solar and atmospheric mass difference squared i.e. U^2_{e3} cos 2
theta_{odot} = (Delta m^2_{odot})/(2 Delta m^2_A) + O(U^4_{e3}, (m_e/m_mu)^2).
Taking the solar neutrino parameters inferred from present data at 99.7%
confidence level, the above relation leads to a lower bound on U_{e3} >= 0.08
and an allowed region in the U_{e3} and (Delta m^2_{odot})/(2 Delta m^2_A)
space which can be tested in proposed long baseline experiments.


title: Diffractive dissociation from non-linear evolution in DIS on nuclei

abstract:
  The process of single diffractive dissociation off nuclei is considered on a
basis of solutions to the nonlinear evolution equation. The relevant saturation
scales $Q_{s A}^D(x,x_0)$ are determined and their dependences on Bjorken $x$,
atomic number $A$, and minimal rapidity gap $Y_0\equiv \ln 1/x_0$ are
investigated. The solutions are shown to posses the geometrical scaling in a
broad kinematic region for $x$ well below $x_0$. A detailed theoretical
discussion of saturation scale and scaling is presented.
  The ratio $\sigma^{diff}/\sigma^{tot}$ is computed for several nuclei. We
predict that at $x\simeq 10^{-4}$ this ratio is of the order 25% which is much
larger to the one of proton. This result indicates a possibility to observe a
very strong nuclear shadowing.


title: A Roadmap For Meson Spectroscopy

abstract:
  An efficient classification of light quark meson states is discussed based on
the dominance of angular and radial quark excitation. A synthesis of Regge and
quark dynamics allows a natural unification of light quark-antiquark
spectroscopies and indicates the states that fall outside this category such as
molecules, hybrids, and glueballs.


title: Close-to-threshold Meson Production in Hadronic Interactions

abstract:
  Studies of meson production at threshold in the hadron--hadron interaction
began in the fifties when sufficient energies of accelerated protons were
available. A strong interdependence between developments in accelerator
physics, detector performance and theoretical understanding led to a unique
vivid field of physics. Early experiments performed with bubble chambers
revealed already typical ingredients of threshold studies, which were
superseded by more complete meson production investigations at the nucleon beam
facilities TRIUMF, LAMPF, PSI, LEAR and SATURNE. Currently, with the advent of
the new cooler rings as IUCF, CELSIUS and COSY the field is entering a new
domain of precision and the next step of further progress.
  The analysis of this new data in the short range limit permits a more
fundamental consideration and a quantitative comparison of the production
processes for different mesons in the few--body final states. The
interpretation of the data take advantage of the fact that production reactions
close-to-threshold are characterized by only a few degrees of freedom between a
well defined combination of initial and exit channels. Deviations from
predictions of phase-space controlled one-meson-exchange models are indications
of new and exciting physics. Precision data on differential cross sections,
isospin and spin observables -- partly but by no means adequately available --
are presently turning up on the horizon. There is work for the next years and
excitement of the physics expected. Here we try to give a brief and at the same
time comprehensive overview of this field of hadronic threshold production
studies.


title: Leptogenesis at Low Scale

abstract:
  A typical problem of the leptogenesis scenario is the mismatch between the
maximum reheat temperature implied by gravitino overproduction bound and the
minimum temperature required to create thermally the lightest right-handed
neutrino. We explore the possibility of baryogenesis via leptogenesis in the
presence of low scale mass right-handed neutrino. In such a scenario,
right-handed neutrinos are created thermally at low reheat temperatures without
relying on non-perturbative production mechanisms. We focus on two specific
realizations of the scenario, namely the out-of-equilibrium decay of
right-handed neutrinos (Fukugita-Yanagida) and the leptogenesis via the $LH_u$
flat direction (Affleck-Dine). We find that in general, the two scenarios are
able to produce the required baryon excess for a reasonable amount of CP
violation.


title: D-Moduli Stabilization

abstract:
  The matter sector of four-dimensional effective supergravity models obtained
from the weakly coupled heterotic string contains many moduli. In particular,
flat directions of the D-term part of the scalar potential in the presence of
an anomalous U(1) give rise to massless chiral multiplets which have been
referred to elsewhere as D-moduli. The stabilization of these moduli is
necessary for the determination of the large vacuum expectation values of
complex scalar fields induced by the corresponding Fayet-Illiopoulos term. This
stabilization is of phenomenological importance since these background values
determine the effective theory below the scale of the anomalous U(1) symmetry
breaking. In some simple models we illustrate the stabilization of these moduli
due to the nonperturbative dynamics associated with gaugino condensation in a
hidden sector. We find that background field configurations which are stable
above the condensation scale no longer represent global minima once dynamical
supersymmetry breaking occurs. The implications for low energy models based on
promising ``flat'' directions are discussed.


title: GUT, Neutrinos, and Baryogenesis

abstract:
  It is an exciting time for flavor physics. In this talk, I discuss recent
topics in baryogenesis and leptogenesis in light of new data, and implications
in B and neutrino physics. I also discuss current situation of grand unified
theories concerning coupling unification, proton decay, and indirect
consequences in lepton flavor violation and B physics. I explain attempts to
understand the origin of flavor based on flavor symmetry, in particular
"anarchy" in neutrinos.


title:
Cabibbo-suppressed non-leptonic decays of Lambda_c and final state
  interaction

abstract:
  With the diquark structure of Lambda_c, we investigate the branching ratios
of Lambda_c -> n pi^+ and p pi^0. The results show that without considering the
final state interaction (FSI), the branching ration of Lambda_c -> p pi^+ is
only of order 10^{-6} whereas taking into account the FSI effects, this ratio
could reach 10^{-4} and is at the same order as Lambda_c -> n pi^0. Concrete
values depend on phenomenological parameters adopted in the calculations. These
branching ratios can be measured in the experiments to come.


title: Saturation and Pion Production in Proton-Nucleus Collisions

abstract:
  We study the effects of gluon saturation on pion production in high energy
proton-nucleus collisions using the color glass condensate model. At high
p_perp, we show that the p_perp-distribution of gluons behaves as ~
1/(p_perp^7) in accordance with both conventional perturbative QCD calculations
and experiment. Fragmentation of gluons into pions leads to a rapidity
dependent depletion of pions relative to the conventional perturbative QCD
predictions. We argue that these clear and systematic differences provide a
signal for the onset of gluon saturation which is accessible in upcoming
experiments.


title: A transparent expression of the A^2-Condensate's renormalisation

abstract:
  We give a more transparent understanding of the vacuum expectation value of
the renormalised local operator A^2 by relating it to the gluon propagator
integrated over the momentum. The quadratically divergent perturbative
contribution is subtracted and the remainder, dominantly due to the O(1/p^2)
correction to the perturbative propagator at large p^2 is logarithmically
divergent. This provides a transparent derivation of the fact that this
O(1/p^2) term is related to the vacuum expectation value of the local A^2
operator and confirms a previous claim based on the operator product expansion
(OPE) of the gluon propagator. At leading logarithms the agreement is
quantitative, with a standard running factor, between the local A^2 condensate
renormalised as described above and the one renormalised in the OPE context.


title:
A general analysis with trilinear and bilinear R-parity violating
  couplings in the light of recent SNO data

abstract:
  We analyse an extension of the minimal supersymmetric standard model
including the dominant trilinear and bilinear R-parity violating contributions.
We take the trilinear terms from the superpotential and the bilinear terms from
the superpotential as well as the scalar potential. We compute the neutrino
masses induced by those couplings and determine the allowed ranges of the
R-parity violating parameters that are consistent with the latest SNO results,
atmospheric data and the Chooz constraint. We also estimate the effective mass
for neutrinoless double beta decay in such scenarios.


title: Current Algebra: Quarks and What Else?

abstract:
  After receiving many requests for reprints of this article, describing the
original ideas on the quark gluon gauge theory, which we later named QCD, we
decided to place the article in the e-Print archive.


title:
LanHEP - a package for automatic generation of Feynman rules in field
  theory. Version 2.0

abstract:
  The LanHEP program for Feynman rules generation in momentum representation is
presented. It reads the Lagrangian written in a compact form, close to the one
used in publications. It means that Lagrangian terms can be written with
summation over indices of broken symmetries and using special symbols for
complicated expressions, such as covariant derivative and strength tensor for
gauge fields. The output is Feynman rules in terms of physical fields and
independent parameters. This output can be written in LaTeX format and in the
form of CompHEP model files, which allows one to start calculations of
processes in the new physical model. Although this job is rather
straightforward and can be done manually, it requires careful calculations and
in modern theories with many particles and vertices, such as supersymmetric
models, can lead to errors and misprints. The program allows one to introduce
into CompHEP new gauge theories as well as various anomalous terms.


title: Interpreting the New Brookhaven g_mu - 2 Result

abstract:
  The latest g_mu - 2 measurement by Brookhaven confirms the earlier
measurement with twice the precision. However, interpretation of the result
requires specific assumptions regarding the errors in the hadronic light by
light (LbL) correction and in the hadronic vacuum polarization correction.
Under the assumption that the analysis on LbL correction of Knecht and Nyffeler
and the revised analysis of Hayakawa and Kinoshita are valid the new BNL result
implies a deviation between experiment and the standard model of 1.6 sigma -2.6
sigma depending on the estimate of the hadronic vacuum polarization correction.
We revisit the g_mu - 2 constraint for mSUGRA and its implications for the
direct detection of sparticles at colliders and for the search for
supersymmetric dark matter in view of the new evaluation.


title:
Lepton transverse polarization in the B --> D l nu_l decay due to the
  electromagnetic final state interaction

abstract:
  The effect of lepton transverse polarization in the B^0 --> D^- l^+ nu_l, B^+
--> bar(D^0) l^+ nu_l decays (l= tau, mu) is analyzed within the framework of
Standard Model in the leading order of HQET. It is shown that the non-zero
transverse polarization appears due to the electromagnetic final state
interaction. The diagrams with intermediate D, D^* - mesons contributing to the
non-vanishing P_T are considered. Regarding only the contribution of these
mesons, values of the tau-lepton transverse polarization, averaged over the
physical region, in the B^0 --> D^- tau^+ nu_l and B^+ --> bar(D^0) tau^+ nu_l
decays are equal to $2.60 cdot 10^{-3} and -1.59 cdot 10^{-3}, correspondingly.
In the case of muon decay modes the values of <P_T> are equal to 2.97 cdot
10^{-4} and -6.79 cdot 10^{-4}.


title:
Self-interactions of the lightest MSSM Higgs boson in the large
  pseudoscalar-mass limit

abstract:
  We investigate the decoupling properties of the Higgs-sector-induced one-loop
corrections in the lightest Higgs-boson self-couplings, in the framework of the
Minimal Supersymmetric Standard Model (MSSM). The renormalized n-point vertex
functions with external Higgs particles in the MSSM and in the SM are derived
to the one-loop level and compared in the MA >> MZ limit. The computation has
been done in a general R_{xi} gauge and the on-shell renormalization scheme is
chosen. By a comparison of the renormalized lightest Higgs-boson h^0 vertex
functions with respect to the corresponding SM ones, we find that the
differences between the predictions of both models are summarized in the
lightest Higgs-boson mass correction Delta Mh. Consequently, the radiative
corrections are absorbed in the Higgs-boson mass, and the trilinear and quartic
h^0 self-couplings acquire the same structure as the couplings of the SM
Higgs-boson. Therefore, decoupling of the heavy MSSM Higgs bosons occurs and
the MSSM h^0 self-interactions converge to the SM ones in the MA >> MZ limit.


title:
Color superconductivity from magnetic interaction induced by flow
  equations

abstract:
  Using flow equations, we derive an effective quark-quark interaction and
obtain the coupled set of gap equations for the condensates of the CFL phase of
massless N_f=3 dense QCD. We find two different sources of the infrared cutoff
in magnetic interaction. When the penetration depth of the magnetic field
inside the superconductor is less than the coherence length of quark-quark
bound state, our results for the gap agree with those of Son. In the other
case, we obtain parametric enhancement of the gap on the coupling constant.


title: R-parity-violating SUSY and CP violation in B --> phi K_s

abstract:
  Recent measurements of CP asymmetry in B --> phi K_S appear to be
inconsistent with Standard Model expectations. We explore the effect of
R-parity-violating SUSY to understand the data.


title: Scalar leptoquark production at TESLA and CLIC based e-gamma colliders

abstract:
  We study scalar leptoquark production at TESLA and CLIC based e-gamma
colliders. Both direct and resolved contributions to the cross section are
examined. We find that the masses of scalar leptoquarks can be probed up to
about 0.9 TeV at TESLA and 2.6 TeV at CLIC.


title: Cosmological implications of low scale quark-lepton unification

abstract:
  There is a unique $\hbox{SU(4)}\otimes\hbox{SU(2)}_L \otimes \hbox{SU(2)}_R$
gauge model which allows quarks and leptons to be unified at the TeV scale --
thereby making the model testable and avoiding the gauge hierarchy problem. In
its minimal form, this model could quite naturally accommodate simultaneous
solutions to the solar and LSND neutrino oscillation data. The atmospheric
neutrino anomaly can be easily accommodated by mirror-symmetrising the minimal
model. The model also contains three right-handed neutrinos, with masses in the
range 1 keV to $\sim$ 1 GeV. We investigate the implications of these
right-handed neutrinos for early Universe cosmology. It is shown that the
minimal model is inconsistent with some of the standard assumptions of the big
bang model. This motivates an examination of non-standard big bang cosmology,
such as a low reheating temperature scenario with $T_{RH} \sim$ MeV. In such a
Universe, peaceful co-existence between low-scale quark-lepton gauge
unification and early Universe cosmology is possible.


title: Inclusive Decays of Heavy Quarkonium to Light Particles

abstract:
  We derive the imaginary part of the potential NRQCD Hamiltonian up to order
1/m^4, when the typical momentum transfer between the heavy quarks is of the
order of Lambda_{QCD} or greater, and the binding energy E much smaller than
Lambda_{QCD}. We use this result to calculate the inclusive decay widths into
light hadrons, photons and lepton pairs, up to O(mv^3 x
(Lambda_{QCD}^2/m^2,E/m)) and O(mv^5) times a short-distance coefficient, for
S- and P-wave heavy quarkonium states, respectively. We achieve a large
reduction in the number of unknown non-perturbative parameters and, therefore,
we obtain new model-independent QCD predictions. All the NRQCD matrix elements
relevant to that order are expressed in terms of the wave functions at the
origin and six universal non-perturbative parameters. The wave-function
dependence factorizes and drops out in the ratio of hadronic and
electromagnetic decay widths. The universal non-perturbative parameters are
expressed in terms of gluonic field-strength correlators, which may be fixed by
experimental data or, alternatively, by lattice simulations. Our expressions
are expected to hold for most of the charmonium and bottomonium states below
threshold. The calculations and methodology are explained in detail so that the
evaluation of higher order NRQCD matrix elements in this framework should be
straightforward. An example is provided.


title: Jets at high energies, factorization and jet vertex in NL ln(s)

abstract:
  The next-to-leading corrections to the jet vertex which is relevant for the
Mueller-Navelet jets production in hadronic collisions and for the forward jet
cross section in lepton-hadron collisions are presented in the context of a k_t
factorizazion formula which resums the leading and next-to-leading logarithms
of the energy. Both the quark- and gluon-initiated contribution are now
computed. This completes the framework for a full phenomenological analysis of
Mueller-Navelet jets in NL log(s) approximation. Forward jets phenomenology
still requires the NL photon impact factor.


title: Parton picture of inelastic collisions at transplanckian energies

abstract:
  We propose a parton model of inelastic collisions at transplanckian energies
E >> G^{-1/2}, using the gravitons, whose transverse momenta are cut at the
Planck scale, as partons. For this purpose we represent the gravitational
shock-wave accompanying the fast particle in terms of such partons and take
into account the higher order multiperipheral-like contributions. We argue that
the internal part of this shock plane contains the ``black'' disk of radius
R(E) ~ E^{1/2} filled by such hard partons with the Planck density. When two
fast particles collide the hard graviton production comes from the region of
intersection of their black disks. The corresponding value of inclusive
cross-section at the given rapidity and the impact parameter is proportional to
the area of this region. The final state with such hard gravitons is unstable
relative to the long range gravitational repulsion, and this leads to the
creation of the multiperipheral chain of black holes at later stages of the
reaction. We discuss various details of this picture including higher order
corrections and there connection to a purely classical approach; we also
consider briefly possible changes when additional hidden dimensions are
present.


title:
P-parity of charmed particles from associative photoproduction of D and
  D^*-mesons

abstract:
  We suggest to measure the triple polarization correlations in the exclusive
associative charm particle photoproduction, vector gamma + vector p --> vector
Lambda_c^{++} bar{D^0} with linearly polarized photons, as a method to
determine the P-parity of the charmed D-meson. The dependence of these
correlations on the parity P(N Lambda_c D) can be predicted in model
independent way. The t-dependence of the differential cross section for vector
meson photoproduction, gamma + p --> Lambda_c^{++} bar{D^{*0}}, in a model
based on D-exchange, is also sensitive to P(N Lambda_c D).


title: Superstring Relics, Supersymmetric Fragmentation and UHECR

abstract:
  Superstring theory predicts the existence of relic metastable particles whose
average lifetime is longer than the age of the universe and which could, in
principle, be good dark matter candidates. At the same time, these states would
be responsible for the Ultra High Energy Cosmic Rays (UHECR) events which will
be searched for by various experimental collaborations in the near future. We
describe a possible phenomenological path which could be followed in order to
search for new physics in their detection.


title: Astrophysical and Cosmological Neutrinos

abstract:
  We review the role of massive neutrinos in astrophysics and cosmology,
assuming that the oscillation interpretation of solar and atmospheric neutrinos
is correct. In particular, we discuss cosmological mass limits, neutrino flavor
oscillations in the early universe, leptogenesis, and neutrinos in
core-collapse supernovae.


title:
Optimal Renormalization-Group Improvement of the Perturbative Series for
  the e^+ e^- -Annihilation Cross-Section

abstract:
  Using renormalization-group methods, we derive differential equations for the
all-orders summation of logarithmic corrections to the QCD series for R(s) =
sigma(e^+ e^- --> hadrons)/sigma(e^+ e^- --> mu^+ mu^-), as obtained from the
imaginary part of the purely-perturbative vector-current correlation function.
We present explicit solutions for the summation of leading and up to three
subsequent subleading orders of logarithms. The summations accessible from the
four-loop vector-correlator not only lead to a substantial reduction in
sensitivity to the renormalization scale, but necessarily impose a common
infrared bound on perturbative approximations to R(s), regardless of the
infrared behaviour of the true QCD couplant.


title:
Three-flavor solar neutrino oscillations with terrestrial neutrino
  constraints

abstract:
  We present an updated analysis of the current solar neutrino data in terms of
three-flavor oscillations, including the additional constraints coming from
terrestrial neutrino oscillation searches at the CHOOZ (reactor),
Super-Kamiokande (atmospheric), and KEK-to-Kamioka (accelerator) experiments.
The best fit is reached for the subcase of two-family mixing, and the
additional admixture with the third neutrino is severely limited. We discuss
the relevant features of the globally allowed regions in the oscillation
parameter space, as well as their impact on the amplitude of possible
CP-violation effects at future accelerator experiments and on the
reconstruction accuracy of the mass-mixing oscillation parameters at the
KamLAND reactor experiment.


title: Unique Identification of Graviton Exchange Effects in e^+ e^- Collisions

abstract:
  Many types of new physics can lead to contact interaction-like modifications
in e^+ e^- processes below direct production threshold. We examine the
possibility of uniquely identifying the effects of graviton exchange, which are
anticipated in many extra dimensional theories, from amongst this large set of
models by using the moments of the angular distribution of the final state
particles. In the case of the e^+ e^- --> f bar{f} process we demonstrate that
this technique allows for the unique identification of the graviton exchange
signature at the 5 sigma level for mass scales as high as 6 sqrt(s). The
extension of this method to the e^+ e^- --> W^+ W^- process is also discussed.


title: On Nonstandard Vacuua in Minimal Supergravity Models

abstract:
  The plethora of scalar fields participating in the formulation of a softly
broken supersymmetric theory can threat the stability of the standard vacuum.
The generic situation is twofold. Directions in scalar field space may exist
along which the potential becomes unbounded from below or local minima deeper
than the standard one are likely to appear where charge and/or color symmetries
are broken. An investigation of these matters requires a thorough study of the
tree level effective potential as well as its radiative corrections. However,
the presence of many different mass scales in such a generic supersymmetric
theory needs an appropriate renormalization improved treatment. Combining the
decoupling theorem with a conveniently chosen renormalization scale for each
field configuration, the well known multimass scale problem is circumvented. In
this context, the ordinary universal soft-parameters case of the minimal
supersymmetric model as well as a non-universal case of a brane world minimal
supergravity model are examined closely for unphysical vacuua.


title: Energy loss in high energy heavy ion collisions from the Hydro+Jet model

abstract:
  We investigate the effect of energy loss of jets in high energy heavy ion
collisions by using a full three-dimensional space-time evolution of a fluid
combined with (mini-)jets that are explicitly evolved in space-time. In order
to fit the pi^0 data for the Au+Au collisions at sqrt(s_{NN}) = 130 GeV, the
space-time averaged energy loss dE/dx(tau <= 3 fm/c) = 0.36 GeV/fm is extracted
within the model. It is found that most energy loss occurs at the very early
time less than 2 fm/c in the QGP phase and that energy loss in the mixed phase
is negligible within our parameterization for jet energy loss. This is a
consequence of strong expansion of the system.


title: The nuance Neutrino Simulation, and the Future

abstract:
  This article briefly describes the "nuance" neutrino simulation software and
outlines the program of the working group on neutrino event generators which
met for the first time at the NUINT'01 meeting.


title:
The static potential: lattice versus perturbation theory in a
  renormalon-based approach

abstract:
  We compare, for the static potential and at short distances, perturbation
theory with the results of lattice simulations. We show that a
renormalon-dominance picture explains why in the literature sometimes
agreement, and another disagreement, is found between lattice simulations and
perturbation theory depending on the different implementations of the latter.
We also show that, within a renormalon-based scheme, perturbation theory agrees
with lattice simulations.


title: CPT and effective Hamiltonians for neutral kaon and similar complexes

abstract:
  We begin with a discussion of the general form and general CP-- and CPT--
transformation properties of the Lee--Oehme--Yang (LOY) effective Hamiltonian
for the neutral kaon complex. Next, the properties of the exact effective
Hamiltonian for this complex are discussed. Using the Khalfin Theorem we show
that the diagonal matrix elements of the effective Hamiltonian governing the
time evolution in the subspace of states of an unstable particle and its
antiparticle need not be equal at for t > t_0 (t_0 is the instant of creation
of the pair) when the total system under consideration is CPT invariant but CP
noninvariant. The unusual consequence of this result is that, contrary to the
properties of stable particles, the masses of the unstable particle "1" and its
antiparticle "2" need not be equal for t >> t_0 in the case of preserved CPT
and violated CP symmetries. We also show that there exists an approximation
which is more accurate than the LOY, and which leads to an effective
Hamiltonian whose diagonal matrix elements posses properties consistent with
the conclusions for the exact effective Hamiltonian described above.


title: Anomalous single production of the fourth SM family quarks at Tevatron

abstract:
  Possible single productions of fourth family u_{4} and d_{4} quarks via
anomalous q_{4}qV interactions at Tevatron are studied. Signature of such
processes are discussed and compared with the recent results from Tevatron.


title: Testing factorization in B -> D(*)X decays

abstract:
  In QCD the amplitude for B0 -> D(*)+pi- factorizes in the large Nc limit or
in the large energy limit Q >> Lambda_QCD where Q = {m_b, m_c, m_b-m_c}. Data
also suggests factorization in exclusive processes B-> D* pi+ pi- pi- pi0 and
B-> D* omega pi-, however by themselves neither large Nc nor large Q can
account for this. Noting that the condition for large energy release in B0-> D+
pi- is enforced by the SV limit, m_b, m_c >> m_b-m_c >> Lambda, we propose that
the combined large Nc and SV limits justify factorization in B -> D(*) X. This
combined limit is tested with the inclusive decay spectrum measured by CLEO. We
also give exact large Nc relations among isospin amplitudes for B -> D(*)X and
B -> D(*) D-bar(*)X, which can be used to test factorization through exclusive
or inclusive measurements. Predictions for the modes B-> D(*) pi pi, B-> D(*)K
K-bar and B-> D(*) D-bar(*) K are discussed using available data.


title: SUSY-Induced Top Quark FCNC Processes at Linear Colliders

abstract:
  In the Minimal Supersymmetric Model (MSSM) the hitherto unconstrained flavor
mixing between top-squark and charm-squark will induce the flavor-changing
neutral-current (FCNC) interaction between top quark and charm quark, which
then give rise to various processes at the next generation linear collider
(NLC), i.e., the top-charm associated productions via $e^+ e^-$, $e^- \gamma$
and $\gamma \gamma$ collisions as well as the top quark rare decays $t \to c V$
($V=g$, $\gamma $ or $Z$). All these processes involve the same part of the
parameter space of the MSSM. Through a comparative analysis for all these
processes at the NLC, we found the best channel to probe such SUSY-induced top
quark FCNC is the top-charm associated production in $\gamma \gamma$ collision,
which occurs at a much higher rate than $e^+ e^-$ or $e^- \gamma$ collision and
may reach the detectable level for some part of the parameter space. Since the
rates predicted by the Standard Model are far below the detectable level, the
observation of such FCNC events would be a robust indirect evidence of SUSY.


title:
GRACE/SUSY Automatic Generation of Tree Amplitudes in the Minimal
  Supersymmetric Standard Model

abstract:
  GRACE/SUSY is a program package for generating the tree-level amplitude and
evaluating the corresponding cross section of processes of the minimal
supersymmetric extension of the standard model (MSSM). The Higgs potential
adopted in the system, however, is assumed to have a more general form
indicated by the two-Higgs-doublet model. This system is an extension of GRACE
for the standard model(SM) of the electroweak and strong interactions. For a
given MSSM process the Feynman graphs and amplitudes at tree-level are
automatically created. The Monte-Carlo phase space integration by means of
BASES gives the total and differential cross sections. When combined with
SPRING, an event generator, the program package provides us with the simulation
of the SUSY particle productions.


title: Andreev reflection in superconducting QCD

abstract:
  In this paper we discuss the phenomenon of the Andreev reflection of quarks
at the interface between the 2SC and the Color-Flavor-Locked (CFL)
superconductors appeared in QCD at asymptotically high densities. We also give
the general introduction to the Andreev reflection in the condensed matter
systems as well as the review of this subject in high density QCD.


title: Final state interactions and gauge invariant parton distributions

abstract:
  Parton distributions contain factorizable final state interaction effects
originating from the fast-moving struck quark interacting with the target
spectators in deeply inelastic scattering. We show that these interactions give
rise to gauge invariance of the transverse momentum-dependent parton
distributions. As compared to previous analyses, our study demonstrates the
existence of extra scaling contributions from transverse components of the
gauge potential at the light-cone infinity. They form a transverse gauge link
which is indispensable for restoration of the gauge invariance of parton
distributions in the light-cone gauge where the gauge potential does not vanish
asymptotically. Our finding helps to explain a number of features observed in a
model calculation of structure functions in the light-cone gauge.


title:
Constraints on Trilinear Coupling Constant A_0 in minimal Supergravity
  Model

abstract:
  Constraints on the common trilinear coupling constant $A_{0}$ are obtained in
the minimal supergravity model. $A_{0}$ is usually given at GUT scale $M_{X}$
by-hand, and has been regarded as one of the five arbitrary parameters in this
model. However, $B(M_{Z})$ as the common bilinear coupling constant $B$ at the
electroweak scale $M_{Z} \simeq 91$(GeV) is fixed by the shape of the Higgs
potential. With the renormalization group equations, this $B(M_{Z})$ is evolved
to $B_{0}$ at $M_{X}$ where a well-known relation exists between the evolved
$B_{0}$ and $A_{0}$ as $B_{0} = (A_{0}-1) m_{0}$. Therefore, $A_{0}$ is fixed
as a function of the other arbitrary parameters. In other words, the number of
arbitrary parameters are reduced by this method. Additionally, large
$\tan{\beta} > 40$ is forbidden by the conditions at $M_Z$.


title:
Quark distributions in polarized rho meson and its comparison with those
  in pion

abstract:
  Valence quark distributions in transversally and longitudinally polarizied
rho mesons in the region of intermediate x are obtained by generalizied QCD sum
rules. Power corrections up to d=6 are taken into account. Comparison of the
results for pi and rho mesons shows, that polarization effects are very
significant and SU(6) symmetry of distribution functions is absent. The strong
suppression of quark and gluon sea distributions in longitudinally polarizied
rho mesons is found.


title:
Production of excited electrons at TESLA and CLIC based e gamma
  colliders

abstract:
  We analyze the potential of TESLA and CLIC based electron-photon colliders to
search for excited spin-1/2 electrons. The production of excited electrons in
the resonance channel through the electron-photon collision and their
subsequent decays to leptons and electroweak gauge bosons are investigated. We
study in detail the three signal channels of excited electrons and the
corresponding backgrounds through the reactions e gamma --> e gamma, e gamma
--> eZ and e gamma --> nu W. Excited electrons with masses up to about 90% of
the available collider energy can be probed down to the coupling f=f'=0.05(0.1)
at TESLA(CLIC) based e gamma colliders.


title: The Structure Function Working Group Summary: DIS2002

abstract:
  A summary of the experimental and theoretical presentations in the Structure
Function Working Group on the proton and photon unpolarized structure functions
is given.


title: Improved Results in Supersymmetric Electroweak Baryogenesis

abstract:
  Electroweak baryogenesis provides a very attractive scenario to explain the
origin of the baryon asymmetry. The mechanism of electroweak baryogenesis makes
use of the baryon number anomaly and relies on physics that can be tested
experimentally. It is today understood that, if the Higgs mass is not larger
than 120 GeV, this mechanism may be effective within supersymmetric extensions
of the Standard Model. In this work, we reconsider the question of baryon
number generation at the electroweak phase transition within the context of the
minimal supersymmetric extension of the Standard Model. We derive the relevant
diffusion equations, give a consistent definition of the sources, and compare
our results with those appearing in the recent literature on this subject


title: Strong-Electroweak Unification at About 4 TeV

abstract:
  It is shown how an $SU(3)^{N}$ nonsupersymmetric quiver gauge theory can
accommodate the standard model with three chiral families and unify all of
$SU(3)_C$, $SU(2)_L$ and $U(1)_Y$ couplings with high accuracy at one unique
scale estimated as $M \simeq 4$ TeV.


title: Relations between Electromagnetic Form Factors of Baryons

abstract:
  The inclusion of two-body exchange currents in the constituent quark model
leads to new relations between the electromagnetic properties of octet and
decuplet baryons. In particular, the N->Delta quadrupole transition form factor
can be expressed in terms of the neutron charge form factor.


title:
Fermion scattering off electroweak phase transition kink walls with
  hypermagnetic fields

abstract:
  We study the scattering of fermions off a finite width kink wall during the
electroweak phase transition in the presence of a background hypermagnetic
field. We derive and solve the Dirac equation for such fermions and compute the
reflection and transmission coefficients for the case when the fermions move
from the symmetric to the broken symmetry phase. We show that the chiral nature
of the fermion coupling with the background field in the symmetric phase
generates an axial asymmetry in the scattering processes. We discuss possible
implications of such axial charge segregation for baryon number generation.


title:
Proton driver optimization for new generation neutrino superbeams to
  search for sub-leading numu->nue oscillations ($\theta_{13}$ angle)

abstract:
  We perform a systematic study of particle production and neutrino yields for
different incident proton energies $E_p$ and baselines $L$, with the aim of
optimizing the parameters of a neutrino beam for the investigation of
$\theta_{13}$-driven neutrino oscillations in the $\Delta m^2$ range allowed by
Superkamiokande results. We study the neutrino energy spectra in the
``relevant'' region of the first maximum of the oscillation at a given baseline
$L$. We find that to each baseline $L$ corresponds an ``optimal'' proton energy
$E_p$ which minimizes the required integrated proton intensity needed to
observe a fixed number of oscillated events. In addition, we find that the
neutrino event rate in the relevant region scales approximately linearly with
the proton energy. Hence, baselines $L$ and proton energies $E_p$ can be
adjusted and the performance for neutrino oscillation searches will remain
approximately unchanged provided that the product of the proton energy times
the number of protons on target remains constant. We apply these ideas to the
specific cases of 2.2, 4.4, 20, 50 and 400 GeV protons. We simulate focusing
systems that are designed to best capture the secondary pions of the
``optimal'' energy. We compute the expected sensitivities to
$\sin^22\theta_{13}$ for the various configurations by assuming the existence
of new generation accelerators able to deliver integrated proton intensities on
target times the proton energy of the order of ${\cal O}(5\times 10^{23})\rm\
GeV\times\rm pot/year$.


title: Charming Penguins Saga

abstract:
  We briefly recall the main formulae for computing the B -> K pi branching
ratios within the "charming penguin" approach, present an updated fit to the
data, and explain why we believe that, in general, these fits can hardly be
used to extract gamma.


title: Hidden strangeness in nucleons, magnetic moments and SU(3)

abstract:
  The role of nonvalence, e.g., sea quarks and/or meson degrees of freedom in
static electroweak baryon observables is briefly discussed.


title: Towards deep-inelastic structure functions at three loops

abstract:
  We report on the status of the calculation of deep-inelastic structure
functions at three loops in perturbative QCD. The method employed allows to
calculate the Mellin moments of structure functions analytically as a general
function of N. As an illustration, we present the leading fermionic
contributions to the non-singlet anomalous dimension of F_2 at three loops and,
as a new result, to the non-singlet coefficient function of F_2 at three loops.


title: Nucleon electromagnetic structure revisited

abstract:
  Unitary and analytic ten-resonance model of the nucleon electromagnetic
(e.m.) structure with canonical normalizations and QCD (up to the logarithmic
correction) asymptotics is constructed on the four-sheeted Riemann surface,
which provides a superposition of vector-meson pole and continuum contributions
in a very natural way. As a result it describes simultaneously all existing
experimental space-like and time-like data on the proton e.m. form factors
(ff's) and on the neutron e.m. ff's as well. A crucial factor in the latter
achievement is the inclusion of a contribution of the fourth excited state of
the $\rho(770)$ meson with the parameters $m_{\rho''''}=2455\pm53 MeV,
\Gamma_{\rho''''}=728\pm2 MeV$ and
$(f^{(1)}_{\rho''''NN}/f_{\rho''''})=0.0549\pm0.0005$,
$(f^{(2)}_{\rho''''NN}/f_{\rho''''})=-0.0103\pm0.0001$. The pronounced effect
of the two-pion continuum on the isovector spectral functions demonstrating a
strong enhancement of the left wing of the $\rho(770)$-resonance close to
two-pion threshold, which was revealed by H\"ohler and Pietarinen by means of
the nucleon ff unitarity condition more than a quarter of the century ago, is
predicted by the model automatically. The model gives large values of the
$f^{(1,2)}_{\phi NN}$ coupling constants, thus indicating the violation of the
OZI rule. Since in the framework of the considered model isoscalar ff's above
their lowest branch point $t^s_0=9m^2_{\pi}$ are complex functions, the
isoscalar spectral function behaviours are predicted as well.


title:
Comment on "The Lamb Shift and Ultra High Energy Cosmic Rays" and
  Comment on "Vacuum Polarization Energy Losses of High Energy Cosmic Rays"

abstract:
  The cosmic rays spectrum has been shown to extend well beyond 10^20 eV. With
nearly 20 events observed in the last 40 years, it is now established that
particles with energies near or above 10^21 eV. No nearby astrophysical object
has been shown to correlate with the arrival directions of the highest energy
events, yet the exponential cut-off in the high energy end of the spectrum one
expects to see in the case of far sources is not visible. It was recently
pointed out that the influence of the vacuum of quantum electrodynamics on
particle propagation could explain qualitatively this mystery. This note is a
critic to these ideas.


title: Variational analysis of the deconfinement phase transition

abstract:
  We study the deconfining phase transition in 3+1 dimensional pure SU(N)
Yang-Mills theory using a gauge invariant variational calculation. We
generalize the variational ansatz of Phys. Rev. D52, 3719 (1995) to mixed
states (density matrices) and minimize the free energy. For N > 3 we find a
first order phase transition with the transition temperature of T_C = 450 Mev.
Below the critical temperature the Polyakov loop has vanishing expectation
value, while above T_C, its average value is nonzero. According to the standard
lore this corresponds to the deconfining transition. Within the accuracy of our
approximation the entropy of the system in the low temperature phase vanishes.
The latent heat is not small but, rather, is of the order of the
nonperturbative vacuum energy.


title: New-Physics Effects on Triple-Product Correlations in Lambda_b Decays

abstract:
  We adopt an effective-lagrangian approach to compute the new-physics
contributions to T-violating triple-product correlations in charmless Lambda_b
decays. We use factorization and work to leading order in the heavy-quark
expansion. We find that the standard-model (SM) predictions for such
correlations can be significantly modified. For example, triple products which
are expected to vanish in the SM can be enormous (~50%) in the presence of new
physics. By measuring triple products in a variety of Lambda_b decays, one can
diagnose which new-physics operators are or are not present. Our general
results can be applied to any specific model of new physics by simply
calculating which operators appear in that model.


title: b Physics Beyond the Standard Model

abstract:
  I review the signals for New Physics in CP-violating measurements in B and
Lambda_b decays. I also discuss ways of identifying this New Physics, should
such a signal be found.


title:
Two-loop and n-loop vertex corrections for eikonal diagrams with massive
  partons

abstract:
  We present the ultraviolet poles and finite terms of two-loop vertex
corrections for diagrams with massive partons in the eikonal approximation. We
discover and prove that the results for a set of the corrections generalize to
n-loop eikonal diagrams. These results will enhance theoretical understanding
and allow greater calculational accuracy for the many partonic processes where
the eikonal approximation is applied.


title:
Dynamics of the chiral phase transition in the 2+1 dimensional
  Gross-Neveu model

abstract:
  The phase diagram of the Gross-Neveu (G-N) model in 2+1 dimensions as a
function of chemical potential and temperature has a simple curve separating
the broken symmetry and unbroken symmetry phases, with chiral symmetry being
restored both at high temperature and high density. We study, in leading order
in the 1/N expansion, the dynamics of the chiral phase transition for an
expanding plasma of quarks in the Gross-Neveu model in 2+1 dimensions assuming
boost invariant kinematics. We compare the time evolution of the order
parameter (mass of the fermion) for evolutions starting in the unbroken and
broken phases. The proper time evolution of the order parameter resembles
previous results in the 1+1 dimensional G-N model in the same approximation.
The time needed to traverse the transition is insensitive to mu.


title: Running of Gauge Couplings in AdS5 via Deconstruction

abstract:
  Running of gauge couplings on a slice of AdS5 is examined using the
deconstruction set-up. Logarithmic running instead of (linear) power law is
justified when the cutoff is lower than the curvature scale. Most of
interesting features in warped gauge theory including the localization of
Kaluza-Klein modes, the widening of higher Kaluza-Klein spectrum spacing are
well captured within the framework of the deconstruction.


title:
The Structure of the Pion and Nucleon, and Leading Neutron Production at
  HERA

abstract:
  Attention is paid to recent results from the ZEUS Collaboration on the photo-
and electro- production of leading neutrons in e^+ p collisions at HERA. Some
implications for the structure of the pion and the nucleon are discussed.


title: Lambda hyperon as helicity analyzer of s quark in B decay

abstract:
  We explore how well one can probe the s quark chirality of the fundamental
weak interaction of nonleptonic B decay using the spin-analyzing property of
the Lambda hyperon. We present the prediction of the Standard Model as
quantitatively as possible in a perturbative QCD picture avoiding detailed
form-factor calculation involving quark mass corrections. A clean test of
chirality will be possible with the decay B-bar to Lambda X.


title:
Exclusive annihilation p pbar -> gamma gamma in a generalized parton
  picture

abstract:
  Exclusive proton-antiproton annihilation into two photons at large s (~10
GeV^2) and |t|,|u| ~ s can be described by a generalized parton picture
analogous to the 'soft mechanism' in wide-angle real Compton scattering. The
two photons are emitted in the annihilation of a single fast quark and
antiquark. The matrix element describing the transition of the p-pbar system to
a q-qbar pair can be related to the timelike proton elastic form factors as
well as to the quark/antiquark distributions measured in inclusive
deep-inelastic scattering. The reaction could be studied with the proposed
1.5-15 GeV high-luminosity antiproton storage ring (HESR) at GSI.


title: Minimal 3-3-1 model, lepton mixing and muonium-antimuonium conversion

abstract:
  The recent experimental results on neutrino oscillation and on
muonium-antimuonium conversion require extension of the minimal 3-3-1 model. We
review the constraints imposed to the model by those measurements and suggest a
pattern of leptonic mixing, with charged leptons in a non-diagonal basis, which
accounts for the neutrino physics and circumvents the tight muonium-antimuonium
bounds on the model. We also illustrate a scenario where this pattern could be
realized.


title:
Searching for the Higgs Bosons of Minimal Supersymmetry with Muon Pairs
  and Bottom Quarks

abstract:
  The prospects for the discovery of neutral Higgs bosons (phi^0 = H^0, h^0,
A^0) produced with bottom quarks via Higgs decays into muon pairs (pp --> b
b-bar phi^0 --> b b-bar mu mu-bar +X) at the CERN LHC are investigated in the
minimal supersymmetric model. The complete physics background from the
production of b b-bar mu mu-bar, b b-bar W^+ W^- (including t t-bar) and jj mu
mu-bar, j = g, u, d, s, c in the Standard Model is calculated with realistic
acceptance cuts. This discovery mode has a simple production mechanism from gg
--> b b-bar phi^0 with its cross section proportional to 1/cos^2(beta) and
could provide an opportunity to measure tan(beta) and the b b-bar phi^0
couplings. In addition, we compare the associated discovery mode above with the
inclusive discovery channel pp --> phi^0 --> mu mu-bar +X. Promising results
are found for the CP-odd pseudoscalar (A^0) and the heavier CP-even scalar
(H^0) Higgs bosons for tan(beta) equivalent to v_2/v_1 >~ 14 and m_A,m_H <~ 325
GeV.


title: On the chirality of quark modes

abstract:
  A model for the QCD vacuum based on a domainlike structured background gluon
field with definite duality attributed to the domains has been shown elsewhere
to give confinement of static quarks, a reasonable value for the topological
susceptibility and indications that chiral symmetry is spontaneously broken. In
this paper we study in detail the eigenvalue problem for the Dirac operator in
such a gluon mean field. A study of the local chirality parameter shows that
the lowest nonzero eigenmodes possess a definite mean chirality correlated with
the duality of a given domain. A probability distribution of the local
chirality qualitatively reproduces histograms seen in lattice simulations.


title: Space-Based Searches for Lorentz and CPT Violation

abstract:
  In this proceedings, a summary is presented of recent research investigating
ways in which high-precision atomic clocks on the International Space Station
could search for violations of Lorentz and CPT symmetry. Space-based searches
offer certain experimental advantages over Earth-based experiments
investigating these symmetries. The results are based on work published in
Physical Review Letters, volume 82, article 090801, 2002.


title: Generalized flux-tube solution in Abelian-projected SU(N) gauge theory

abstract:
  The [U(1)]^{N-1} dual Ginzburg-Landau (DGL) theory as a low-energy effective
theory of Abelian-projected SU(N) gauge theory is formulated in a Weyl
symmetric way. The string tensions of flux-tube solutions of the DGL theory
associated with color-electric charges in various representations of SU(N) are
calculated analytically at the border between type-I and type-II of the dual
superconducting vacuum (Bogomol'nyi limit). The resulting string tensions
satisfy the flux counting rule, which reflects the non-Abelian nature of gauge
theory.


title:
Updated Implications of the Muon Anomalous Magnetic Moment for
  Supersymmetry

abstract:
  We re-examine the bounds on supersymmetric particle masses in light of the
new E821 data on the muon anomalous magnetic moment and the revised theoretical
calculations of its hadronic contributions. The current experimental excess is
either 1.5 sigma or 3.2 sigma depending on whether e+e- or tau-decay data are
used in the theoretical calculations for the leading order hadronic processes.
Neither result is compelling evidence for new physics. However, if one
interprets the excess as coming from supersymmetry, one can obtain upper mass
bounds on many of the particles of the minimal supersymmetric standard model
(MSSM). Within this framework we provide a general analysis of the lightest
masses as a function of the deviation so that future changes in either
experimental data or theoretical calculations can easily be translated into
upper bounds at the desired level of statistical significance. In addition, we
give specific bounds on sparticle masses in light of the latest experimental
and theoretical calculations for the MSSM with universal slepton masses, with
and without universal gaugino masses.


title: The electroweak matter sector from an effective theory perspective

abstract:
  The object of this thesis is the study of some open problems in the
electroweak matter sector from an effective theory perspective. The topics
studied include:
  General aspects of dynamical symmetry breaking models, studying what traces
these mechanisms may leave at low energies.
  A treatment of CP violation and family mixing in the framework of an
effective theory and the determination of some of the effective couplings
involved.
  Theoretical issues connecting the renormalization group, gauge invariance,
CP, CPT and physical observables.
  The possibility of experimentally constraining some of the effective
couplings involved at the LHC.


title:
Upper and Lower Limits on Neutralino WIMP Mass and Spin--Independent
  Scattering Cross Section, and Impact of New (g-2)_{mu} Measurement

abstract:
  We derive the allowed ranges of the spin--independent interaction cross
section $\sigsip$ for the elastic scattering of neutralinos on proton for wide
ranges of parameters of the general Minimal Supersymmetric Standard Model. We
investigate the effects of the lower limits on Higgs and superpartner masses
from colliders, as well as the impact of constraints from $\bsgamma$ and the
new measurement of $\gmtwo$ on the upper and lower limits on $\sigsip$. We
further explore the impact of the neutralino relic density, including
coannihilation, and of theoretical assumptions about the largest allowed values
of the supersymmetric parameters. For $\mu>0$, requiring the latter to lie
below $1\tev$ leads to $\sigsip\gsim 10^{-11}\pb$ at $\mchi\sim100\gev$ and
$\sigsip\gsim 10^{-8}\pb$ at $\mchi\sim1\tev$. When the supersymmetric
parameters are allowed above $1\tev$, for $440\gev \lsim \mchi\lsim 1020 \gev$
we derive a {\em parameter--independent lower limit} of $\sigsip \gsim 2\times
10^{-12}\pb$. (No similar lower limits can be set for $\mu<0$ nor for
$1020\gev\lsim\mchi\lsim2.6\tev$.) Requiring $\abundchi<0.3$ implies a {\em
parameter--independent upper limit} $\mchi\lsim2.6\tev$. The new $\epem$--based
measurement of $(g-2)_{\mu}$ restricts $\mchi\lsim 350\gev$ at $1 \sigma$ CL
and $\mchi\lsim515\gev$ at $2 \sigma$ CL, and implies $\mu>0$. The largest
allowed values of $\sigsip$ have already become accessible to recent
experimental searches.


title: Parametric resonance in quantum field theory

abstract:
  We present the first study of parametric resonance in quantum field theory
from a complete next-to-leading order calculation in a 1/N-expansion of the 2PI
effective action, which includes scattering and memory effects. We present a
complete numerical solution for an O(N)-symmetric scalar theory and provide an
approximate analytic description of the nonlinear dynamics in the entire
amplification range. We find that the classical resonant amplification at early
times is followed by a collective amplification regime with explosive particle
production in a broad momentum range, which is not accessible in a
leading-order calculation.


title:
On generation of Abelian magnetic fields in SU(3) gluodynamics at high
  temperature

abstract:
  The vacuum state of SU(3) gluodynamics at high temperature is investigated. A
consistent approach including the calculation of either the spontaneously
generated constant chromomagnetic isotopic $H_{3}$ and hypercharge $H_{8}$
fields or the polarization operator of charged gluons in this background is
applied. It is shown within the effective potential including the one-loop plus
daisy diagrams that the specific values of the fields deliver a global minimum
to free energy. The spectrum of the transversal charged modes is stable at high
temperature due to a gluon magnetic mass accounting for the vacuum fields. This
leads to stable chromomagnetic fields in the deconfinement phase of QCD. A
comparison with the results of other approaches is done.


title: Supersymmetric Dark Matter and the Reheating Temperature of the Universe

abstract:
  Since the thermal history of the Universe is unknown before the epoch of
primordial nucleosynthesis, the largest temperature of the radiation dominated
phase (the reheating temperature) might have been as low as 1 MeV. We perform a
quantitative study of supersymmetric dark matter relic abundance in
cosmological scenarios with low reheating temperature. We show that, for values
of the reheating temperature smaller than about 30 GeV, the domains of the
supergravity parameter space which are compatible with the hypothesis that dark
matter is composed by neutralinos are largely enhanced. We also find a lower
bound on the reheating temperature: if the latter is smaller than about 1 GeV
neutralinos cannot be efficiently produced in the early Universe and then they
are not able to explain the present amount of dark matter.


title: Resummed event-shape variables in DIS

abstract:
  We complete our study of resummed event-shape distributions in DIS by
presenting results for the class of observables that includes the current jet
mass, the C-parameter and the thrust with respect to the current-hemisphere
thrust axis. We then compare our results to data for all observables for which
data exist, fitting for alpha_s and testing the universality of
non-perturbative 1/Q effects. A number of technical issues arise, including the
extension of the concept of non-globalness to the case of discontinuous
globalness; singularities and non-convergence of distributions other than in
the Born limit; methods to speed up fixed-order Monte Carlo programs by up to
an order of magnitude, relevant when dealing with many x and Q points; and the
estimation of uncertainties on the predictions.


title: Numerical Investigation of Fermion Mass Generation in QED

abstract:
  We investigate the dynamical generation of fermion mass in quantum
electrodynamics (QED). This non-perturbative study is performed using a
truncated set of Schwinger-Dyson equations for the fermion and the photon
propagator.
  First, we study dynamical fermion mass generation in quenched QED with the
Curtis-Pennington vertex, which satisfies the Ward-Takahashi identity and
ensures the multiplicative renormalizability of the fermion propagator. We
apply bifurcation analysis to determine the critical point for a general
covariant gauge.
  In the second part of this work we investigate the dynamical generation of
fermion mass in full, unquenched QED. We develop a numerical method to solve
the system of three coupled non-linear equations for the dynamical fermion
mass, the fermion wavefunction renormalization and the photon renormalization
function. Much care is taken to ensure the high accuracy of the solutions. We
also discuss in detail the proper numerical cancellation of the quadratic
divergence in the vacuum polarization integral and the need to use smooth
approximations to the solutions.


title: Limits on the Mixing of Tau Neutrino to Heavy Neutrinos

abstract:
  Limits at 90 % c.l. on the square of the mixing strength |U_tau4|^2 between
nu_tau and a mostly isosinglet heavy neutrino with mass in the range 10-290
MeV/c^2 are reported. The results were derived using the negative result of a
search for neutral particles decaying into two electrons conducted by the CHARM
collaboration in a neutrino beam dump experiment. Upper limits ~10^-4 were
obtained for neutrino masses larger than 160 MeV/c^2.


title: Precision muon g-2 results and light Higgs bosons in the 2HDM(II)

abstract:
  We discuss the implications of the recent evaluations of the SM contribution
to a_mu=(g-2)_mu/2 in the light of the latest E821 measurement, which indicate
\~ 3 sigma deviation. We derive the 95 % CL interval, delta a_mu, to be used to
constrain any additional contribution to a_mu, beyond the SM ones; it has to
have a positive sign. We apply the delta a_mu to constrain the light
Higgs-boson scenarios in a Two-Higgs-Doublet-Model (``Model II''). If the
constraints from the new (g-2)_mu results are combined with the other existing
constraints, one can exclude a light-scalar scenario at 95 % CL, while a
light-pseudoscalar scenario can be realized, for a pseudoscalar mass between 25
and 70 GeV, with tan beta in the range 25 < tan beta < 115.


title: Oases in the Desert: Three New Proposals

abstract:
  Two new nontrivial U(1) gauge symmetries are proposed, one based on the
particle content of the standard model and the other on that of its
supersymmetric generalization. Each is an unexpected first example of its kind.
A third new proposal is the successful derivation of a realistic Majorana
neutrino mass matrix, based on the underlying symmetry A_4 and its radiative
corrections.


title:
Higgs-mediated leptonic decays of B_s and B_d mesons as probes of
  supersymmetry

abstract:
  If tan(beta) is large, down-type quark mass matrices and Yukawa couplings
cannot be simultaneously diagonalized, and flavour violating couplings of the
neutral Higgs bosons are induced at the 1-loop level. These couplings lead to
Higgs-mediated contributions to the decays B_s -> mu+ mu- and B_d -> tau+ tau-,
at a level that might be of interest for the current Tevatron run, or possibly,
at B-factories. We evaluate the branching ratios for these decays within the
framework of minimal gravity-, gauge- and anomaly-mediated SUSY breaking
models, and also in SU(5) supergravity models with non-universal gaugino mass
parameters at the GUT scale. We find that the contribution from gluino loops,
which seems to have been left out in recent phenomenological analyses, is
significant. We explore how the branching fraction varies in these models,
emphasizing parameter regions consistent with other observations.


title:
Decoupling of Anomalous Top-Quark-Decay Vertices in Angular Distribution
  of Secondary Particles

abstract:
  Angular distribution of a secondary particle from top-quark decays is studied
in a simple and general manner, paying careful attention to how relevant the
top-quark production mechanism is. The conditions that lead to the distribution
free from any possible anomalous top-quark decay interactions are specified. It
is discussed how important the approximations adopted in earlier papers are.


title: CP Violation: The CKM Matrix and New Physics

abstract:
  Recent measurements of CP violating asymmetries have led to a significant
progress in our understanding of CP violation. The implications of the
experimental results for the Kobayashi-Maskawa mechanism and for new physics
are explained.


title: Scalar mesons in QCD and tests of the gluon content of the sigma

abstract:
  We summarize the different features of the scalar mesons from QCD spectral
sum rule analyses of the two- and three-point functions. The results do not
favour the u-bar u + d-bar d interpretation of the broad and low mass sigma
(0.6), and the u-bar s resonance nature of the eventually observed kappa(0.9)
meson. We also discuss some OZI-violating and classic semileptonic and
radiative decay processes which can reveal in a model-independent way the
eventual gluon component sigma_B of the sigma. In a meson-gluonium mixing
scenario, one also expects an observation of the K K-bar final states from the
sigma_B which may compete (if phase space allowed) with the one from a low mass
s-bar s state assumed in the literature to be the SU(3) partner of the $\sigma
(0.6)$ if this latter is a u-bar u + d-bar d state


title: On the QCD coupling behavior in the infrared region

abstract:
  The summary of nonperturbative results for the QCD invariant coupling
bar{alpha}_s obtained by lattice simulations for functional integral and by
solution of approximate Dyson--Schwinger equations reveals a puzzling variety
of IR behavior of bar{alpha}_s(Q^2) even on a qualitative level. This, in turn,
rises a question of correspondence between the results obtained so far by
different groups.
  We analyze this issue in terms of mass-dependent coupling constant
transformations and conclude that the question of the IR behavior of effective
QCD coupling and of propagators is not a well--defined one and needs to be more
specified.


title: Status and Prospects of CKM Phase Determinations

abstract:
  We give an overview of direct determinations of the angles of the unitarity
triangle of the CKM matrix, using CP-violating effects in B-meson decays. After
a discussion of B --> pi K modes, which can be described efficiently through
allowed regions in observable space and play an important role to determine
gamma, we turn to extractions of the B^0_d -- bar{B^0_d} mixing phase phi_d,
which equals 2 beta in the Standard Model, from B_d --> J/psi K_S, and
emphasize that it is important to determine this phase unambiguously. Finally,
we focus on B_d --> pi^+ pi^-, where recent B-factory data point towards large
penguin contributions. The question arises now how the CP-violating observables
of this mode can be transformed into information on the angles of the unitarity
triangle. A promising tool to achieve this goal is offered by B_s --> K^+K^-,
which is very accessible at hadronic B experiments, and allows a determination
of phi_d and gamma. A variant for the e^+e^- B-factories is provided by B_d -->
pi^{+/-} K^{+/-}, where data are already available, pointing to an exciting
picture and a highly constrained allowed region in B_s --> K^+K^- observable
space.


title: Production of the neutral toppion at the e gamma colliders

abstract:
  In the framework of topcolor-assisted technicolor(TC2) model, we study a
neutral toppion production process $e^{-}\gamma\to e^{-}\Pi^{0}_{t}$ in this
paper. Our results show that the production cross section of $e^{-}\gamma\to
e^{-}\Pi^{0}_{t}$ can reach the level of several tens fb, and over $10^{3}$
neutral toppion events can be produced in the planned $e^+e^-$ linear colliders
each year. Therefore, such a toppion production process provides us a unique
chance to detect toppion events and test the TC2 model. On the other hand, the
cross section of $e^{-}\gamma\to e^{-}\Pi^{0}_{t}$ is about one order of
magnitude larger than those of some similar processes in SM and MSSM(i.e.,
$e^{-}\gamma\to e^{-}H$ in SM and $e^{-}\gamma\to e^{-}H^{0}(A^0,h^0)$ in
MSSM). So, we can easily distinguish the neutral toppion from other neutral
Higgs bosons in SM and MSSM.


title:
Microscopic spectral density in random matrix models for chiral and
  diquark condensation

abstract:
  We examine random matrix models of QCD which are capable of supporting both
chiral and diquark condensation. A numerical study of the spectral densities
near zero virtuality shows that the introduction of color in the interactions
does not alter the one-body results imposed by chiral symmetry. A model with
three colors has the spectral density predicted for the chiral ensemble with a
Dyson index beta = 2; a pseudoreal model with two colors exhibits the spectral
density of the chiral ensemble with beta = 1.


title: Wave packets and quantum oscillations

abstract:
  We give a detailed analysis of the oscillation formula within the context of
the wave packet formalism. Particular attention is made to insure flavor
eigenstate creation in the physical cases (Delta p not equal 0). This
requirement imposes non instantaneous particle creation in all frames. It is
shown that the standard formula is not only exact when the mass wave packets
have the same velocity, but it is a good approximation when minimal slippage
occurs. For more general situations the oscillation formula contains additional
arbitrary parameters, which allows for the unknown form of the wave packet
envelope.


title: Direct CP Violation in B->phi K_s and New Physics

abstract:
  In the presence of large New Physics contributions to loop-induced b->s
transitions, sizable direct CP violation in B-> phi K decays is expected on
general grounds. We compute explicitly CP-violating effects using QCD
factorization and find that, even in the restricted case in which New Physics
has the same penguin structure as the Standard Model, the rate asymmetry can be
of order one. We briefly discuss a more general scenario and comment on the
inclusion of power-suppressed corrections to factorization.


title: Forward--Backward Asymmetry in B -> X_s l^+ l^- at the NNLL Level

abstract:
  We report the results of a new calculation of soft-gluon corrections in B ->
X_s l^+ l^- decays. In particular, we present the first calculation of
bremsstrahlung and corresponding virtual terms to the lepton forward-backward
asymmetry, which allows us to systematically include all contributions to this
observable beyond the lowest non-trivial order. The new terms are important,
for instance the position of the zero of the asymmetry receives corrections of
O(10%). Using a different method, we also provide an independent check of
recently published results on bremsstrahlung and infrared virtual corrections
to the dilepton-invariant mass distribution.


title: KamLAND, solar antineutrinos and their magnetic moment

abstract:
  We investigate the possibility of detecting solar antineutrinos with the
KamLAND experiment. These antineutrinos are predicted by spin-flavor
oscillations at a significant rate even if this mechanism is not the leading
solution to the SNP. The recent evidence from SNO shows that a) the neutrino
oscillates, only around 34% of the initial solar neutrinos arrive at the Earth
as electron neutrinos and b) the conversion is mainly into active neutrinos,
however a non e, mu, tau component is allowed: the fraction of oscillation into
non-mu-tau neutrinos is found to be cos^2(alpha) = 0.08^{+0.20}_{-0.40}. This
residual flux could include sterile neutrinos and/or the antineutrinos of the
active flavors.
  KamLAND is potentially sensitive to antineutrinos derived from solar ^8 B
neutrinos. In case of negative results, we find that KamLAND could put strict
limits on the flux of solar antineutrinos, Phi(^8 B) < 1.0 times 10^4 cm^{-2}
s^{-1}, more than one order of magnitude smaller than existing limits, and on
their appearance probability P < 0.20-0.15% (95% CL) after 1-3 years of
operation. Assuming a concrete model for antineutrino production by spin-flavor
precession, this upper bound implies an upper limit on the product of the
intrinsic neutrino magnetic moment and the value of the solar magnetic field mu
B < 10^{-21} MeV (95% CL). For B ~ 10-100 kG, we would have mu <
10^{-11}-10^{-12} mu_B (95% CL).
  In the opposite case, if spin-flavor precession is indeed at work even at a
non-leading rate, the additional flux of antineutrinos could strongly distort
the signal spectrum seen at KamLAND at energies above 4-5 MeV and their
contribution should properly be taken into account.


title:
A determination of gluon spin distribution from the deep inelastic
  scattering data

abstract:
  In order to determine polarized parton densities in nucleon we have made fits
using all experimental data on spin asymmetries measured in the deep inelastic
scattering on different nucleon targets. We have used in our analysis next to
leading order QCD corrections in bar{MS} renormalization scheme. The functional
forms of polarized densities are based on the fit to unpolarized deep inelastic
data made by the MRST group (MRST 99). We have concentrated on different models
for gluon spin distributions. In the best fit we get for gluon polarization (at
Gev^{2}) Delta G=-1.0 +/- 0.6. The obtained result does not depend very much on
various model assumptions


title:
CP asymmetry in B --> phi K_S decays in left-right models and its
  implications on B_s decays

abstract:
  In left-right models the gluonic penguin contribution to b --> s s-bar s
transition is enhanced by m_t/m_b due to the presence of (V+A) currents and by
the larger values of loop functions than in the Standard Model. Together those
may completely overcome the suppression due to small left-right mixing angle xi
<~ 0.013. Two independent new phases in the B --> phi K_S decay amplitude
appearing in a large class of left-right models may therefore modify the time
dependent CP asymmetry in this decay mode by O(1) and explain the recent BaBar
and Belle CP asymmetry measurements in this channel. This new physics scenario
implies observable deviations from the Standard Model also in B_s decays which
could be measured at upcoming Tevatron and LHC.


title: Searching for Supersymmetric Dark Matter

abstract:
  The supersymmetric extension to the Standard Model offers a promising cold
dark matter candidate, the lightest neutralino. I will review the prospects for
the detection of this candidate in both accelerator and direct detection
searches.


title:
Ultra high-energy neutrino at GZK energy: Z-WW showering in dark halo
  and tau airshowers emerging from the Earth

abstract:
  Relic neutrino nu_r light masses clustering in Galactic and Local Hot Dark
Halos act as a beam dump calorimeter. Ultra High Energy nu, above ZeV, born by
AGNs, GRBs at cosmic edges, overcoming (GZK) cut-off, may hit near Z resonance
and WW-ZZ channels energies: their showering into UHECR fit observed data . Any
tiny neutrino mass splitting may reflect into a twin bump at highest GZK energy
cut-off. The Z or WW,ZZ showering explain a peculiar clustering in observed
UHECR spectra at 10^19, 210^19, 4 10^19 eV found by AGASA. Coincidence of
clustered UHECR with highest gamma BLac sources is well tuned to Z-Showering
Scenario. Additional prompt TeVs signals occur offering a natural solution of
growing Infrared-TeV cut-off paradoxes related to distant TeV BLac sources and
a GRB at TeV energy. Electromagnetic Cascades tail explain correlation found
between GeV-EGRET Sources and UHECR. Such UHE nu Astrophysics might trace into
Horizontal Tau Air-Showers originated by the UHE nu_tau Earth-Skimming in wide
Corona Earth Crust around the observer. These Upward and Horizontal tau
Air-Showers UPTAUS, HORTAUS, monitor huge volumes from high mountains as well
as observing from planes, balloons and satellites. HORTAUS from mountains
observe corona masses at UHE neutrino at EeVs energies comparable to few km^3,
while from satellites at orbit altitudes, at GZK energies, their corresponding
Horizontal Corona Masses may even exceed 150 km^3. The expected event rate may
exceed a dozen of event a year in Z-WW Showering model from satellite.


title: Modified Fragmentation Function and Jet Quenching at RHIC

abstract:
  Medium modification of jet fragmentation functions and parton energy loss in
cold and hot matter are reviewed. The predicted nuclear modification of the jet
fragmentation function agrees well with the recent HERMES data with a resultant
energy loss dE/dx approximately 0.5 GeV/fm. From the the recent PHENIX data of
high p_T pi_0 spectra in central Au+Au collisions at sqrt(s)=130 GeV, one
extracts an energy loss for a 10 GeV parton that is equivalent to dE/dx=7.3
GeV/fm in a static medium with the same gluon density as in the initial stage
of the collision at tau_0=0.2 fm/c. Constraints on jet quenching by the central
rapidity density of charged hadrons is also discussed.


title:
Phenomenological tests for the freezing of the QCD running coupling
  constant

abstract:
  We discuss phenomenological tests for the frozen infrared behavior of the
running coupling constant and gluon propagators found in some solutions of
Schwinger-Dyson equations of the gluonic sector of QCD. We verify that several
observables can be used in order to select the different expressions of alpha_s
found in the literature. We test the effect of the nonperturbative coupling in
the tau-lepton decay rate into nonstrange hadrons, in the rho vector meson
helicity density matrix that are produced in the chi_{c2} --> rho rho decay, in
the photon to pion transition form factor, and compute the cross sections for
elastic proton-proton scattering and exclusive rho production in deep inelastic
scattering. These quantities depend on the infrared behavior of the coupling
constant at different levels, we discuss the reasons for this dependence and
argue that the existent and future data can be used to test the approximations
performed to solve the Schwinger-Dyson equations and they already seems to
select one specific infrared behavior of the coupling.


title:
Production of a pseudo-scalar Higgs boson at hadron colliders at
  next-to-next-to leading order

abstract:
  The production cross section for pseudo-scalar Higgs bosons at hadron
colliders is computed at next-to-next-to-leading order (NNLO) in QCD. The
pseudo-scalar Higgs is assumed to couple only to top quarks. The NNLO effects
are evaluated using an effective lagrangian where the top quarks are integrated
out. The NNLO corrections are similar in size to those found for scalar Higgs
boson production.


title: Neutrino Mass Matrix a la Mode

abstract:
  With the accumulation of many years of solar and atmospheric neutrino
oscillation data, the approximate form of the 3 times 3 neutrino mixing matrix
is now known. What is not known is the (presumably Majorana) neutrino mass
matrix M_{nu} itself. In this chapter, the approximate form of M_{nu} is
derived, leading to seven possible neutrino mass patterns: three have the
normal hierarchy, two have the inverse hierarchy, and two have three nearly
degenerate masses. The generalization of this to allow U_{e3} not equal 0 with
maximal CP violation is also discussed. A specific automatic realization of
this M_{nu} from radiative corrections of an underlying non-Abelian discrete
A_4 symmetry in the context of softly broken supersymmetry is presented.


title: A computation of the mass spectrum of mesons and baryons

abstract:
  In this paper we give a computation of the mass spectrum of mesons and
baryons. By this computation we show that there is a consecutive numbering of
the mass spectrum of mesons and baryons. We show that in this numbering many
stable mesons and baryons are assigned with a prime number.
  PACS numbers: 12.40.Yx, 14.20Gk, 14.40A, 14.40Cs.


title:
Has the anomalous single production of the fourth SM family quarks
  decaying into light Higgs boson been observed by CDF?

abstract:
  Superjet events observed by the CDF Collaboration are interpreted as
anomalous single production of the fourth SM family u_4 quark, decaying into a
new light scalar particle. The specific predictions of the proposed mechanism
are discussed.


title:
Associated production of a Higgs boson with tau sleptons in the CP
  violating MSSM at future e^+ e^- colliders

abstract:
  We investigate the production of the lightest neutral Higgs boson in
association with tau sleptons in the CP violating minimal supersymmetric
standard model (MSSM) at future high-energy $e^{+}e^{-}$ linear colliders. In
parameter space of the constrained MSSM, the production cross section of
$e^{+}e^{-}\to h^0\widetilde{\tau}^+_1\widetilde{\tau}^-_1$ can be very
substantial at high energies. This process would provide a new production
mechanism of neutral Higgs bosons and open a window to probe the Higgs-stau
coupling and some soft supersymmetric breaking parameters at next linear
colliders.


title:
Weakened Constraints from $b \to s \gamma$ on Supersymmetry Flavor
  Mixing Due to Next-To-Leading-Order Corrections

abstract:
  We examine the process $B \to X_s \gamma$ in minimal supersymmetry (SUSY)
with general squark flavor mixings. We include all relevant next--to--leading
order (NLO) QCD corrections and dominant NLO SUSY effects from the gluino. We
find that gluino--squark corrections to down--type quark masses induce large
NLO corrections to the dominant Wilson coefficients whose size is often similar
to those at LO, especially at large $\tan\beta$. For $\mu>0$, destructive
interference, and suppression by the renormalization group running lead to a
``focusing effect'' of reducing the size of gluino corrections to the branching
ratio, and also of reducing the LO sensitivity to flavor mixings among squarks.
Constraints from $B(B \to X_s \gamma)$ on the SUSY--breaking scale can become
significantly weakened relative to the minimal flavor violation case, even, at
large $\tan\beta$, for small flavor mixings. The case of $\mu<0$ can also
becomes allowed.


title:
Lepton Masses and Mixing in a Left-Right Symmetric Model with a
  TeV-scale Gravity

abstract:
  We construct a left-right symmetric (LRS) model in five dimensions which
accounts naturally for the lepton flavor parameters. The fifth dimension is
described by an orbifold, S_1/Z_2 times Z'_2, with a typical size of order
TeV^{-1}. The fundamental scale is of order 25 TeV which implies that the gauge
hierarchy problem is ameliorated. In addition the LRS breaking scale is of
order few TeV which implies that interactions beyond those of the standard
model are accessible to near future experiments. Leptons of different
representations are localized around different orbifold fixed points. This
explains, through the Arkani-Hamed-Schmaltz mechanism, the smallness of the tau
mass compared to the electroweak breaking scale. An additional U(1) horizontal
symmetry, broken by small parameters, yields the hierarchy in the charged
lepton masses, strong suppression of the light neutrino masses and accounts for
the mixing parameters. The model yields several unique predictions. In
particular, the branching ratio for the lepton flavor violating process mu^-
--> e^+ e^- e^- is comparable with its present experimental sensitivity.


title:
On the Variational method for LPM Suppression of Photon Emission from
  Quark-Gluon Plasma

abstract:
  The photon emission rates from the quark gluon plasma have been studied
considering LPM suppression effects. The integral equation for the transverse
vector function (f(p)) that consists of multiple scattering effects has been
solved using self-consistent iterations method. Empirical fits to the peak
positions of the distributions from iteration method have been obtained for
bremsstrahlung and annihilation with scattering (AWS) processes. The
variational approach for f(p) calculation has been simplified considerably
making some assumptions. Using this method, the photon emission rates at finite
baryon density have been estimated. The LPM suppression factors for
bremsstrahlung and annihilation with scattering (AWS) processes have been
obtained as a function of photon energy and baryon density. The effect of
baryon density has been shown to be rather weak and the suppression factors are
similar to the zero density case. The suppression factors for AWS processes can
be taken at zero density, whereas the bremsstrahlung suppression can be taken
at zero density multiplied by a density dependent factor.


title:
Associated Production of Heavy Quarkonia and Electroweak Bosons at
  Present and Future Colliders

abstract:
  We investigate the associated production of heavy quarkonia, with
angular-momentum quantum numbers ^{2S+1}L_J = ^1S_0, ^3S_1, ^1P_1, ^3P_J (J =
0, 1, 2), and photons, Z bosons, and W bosons in photon-photon, photon-hadron,
and hadron-hadron collisions within the factorization formalism of
nonrelativistic quantum chromodynamics providing all contributing partonic
cross sections in analytic form. In the case of photoproduction, we also
include the resolved-photon contributions. We present numerical results for the
processes involving J/psi and chi_{cJ} mesons appropriate for the Fermilab
Tevatron, CERN LHC, DESY TESLA, operated in the e^+ e^- and gamma gamma modes,
and DESY THERA.


title: Gluodynamics in external field in dual superconductor approach

abstract:
  We show that gluodynamics in an external Abelian electromagnetic field should
possess a deconfining phase transition at zero temperature. Our analytical
estimation of the critical external field is based on the dual superconductor
picture which is formulated in the Euclidean space suitable for lattice
calculations. A dual superconductor model corresponding to the SU(2)
gluodynamics possesses confinement and deconfinement phases below and,
respectively, above the critical field. A dual superconductor model for the
SU(3) gauge theory predicts a rich phase structure containing confinement,
asymmetric confinement and deconfinement phases. The quark bound states in
these phases are analyzed. Inside the baryon the strings are Y--shaped as
predicted by the dual superconductor picture. This shape is geometrically
asymmetric in the asymmetric confinement phases. The results of the paper can
be used to check the dual superconductor mechanism in gluodynamics.