title: Exact Cross Sections for the Neutralino-Slepton Coannihilation

abstract:
  Coannihilation processes provide an important additional mechanism for
reducing the density of stable relics in the Universe. In the case of the
stable lightest neutralino of the MSSM, and in particular the Constrained MSSM
(CMSSM), the coannihilation with sleptons plays a major role in opening up
otherwise cosmologically excluded ranges of supersymmetric parameters. In this
paper, we derive a full set of exact, analytic expressions for the
coannihilation of the lightest neutralino with the sleptons into all two--body
tree--level final states in the framework of minimal supersymmetry. We make no
simplifying assumptions about the neutralino nor about sfermion masses and
mixings other than the absence of explicit CP--violating terms and
inter--family mixings. The expressions should be particularly useful in
computing the neutralino WIMP relic abundance without the approximation of
partial wave expansion. We illustrate the effect of our analytic results with
numerical examples and demonstrate a sizeable difference with approximate
expressions available in the literature.


title: Azimuthal asymmetries and Collins analyzing power

abstract:
  Spin azimuthal asymmetries in pion electro-production in deep inelastic
scattering off longitudinally polarized protons, measured by HERMES, are well
reproduced theoretically with no adjustable parameters. Predictions for
azimuthal asymmetries for a longitudinally polarized deuteron target are given.
The z-dependence of the Collins fragmentation function is extracted. The first
information on e(x) is extracted from CLAS A_LU asymmetry.


title: Product Groups, Discrete Symmetries, and Grand Unification

abstract:
  We study grand unified theories based on an SU(5)xSU(5) gauge group in which
the GUT scale, M_{GUT}, is the VEV of an exact or approximate modulus, and in
which fast proton decay is avoided through a combination of a large triplet
mass and small triplet couplings. These features are achieved by discrete
symmetries. In many of our models, M_{GUT} is generated naturally by the
balance of higher dimension terms that lift the GUT modulus potential, and soft
supersymmetry breaking masses. The theories often lead to interesting patterns
of quark and lepton masses. We also discuss some distinctions between grand
unified theories and string unification.


title: Position space interpretation for generalized parton distributions

abstract:
  For an unpolarized target, the generalized parton distribution $H_q(x,0,t)$
is related to the distribution of partons in impact parameter space. The
transverse distortion of this distribution for a transversely polarized target
is described by $E_q(x,0,t)$.


title:
The charge asymmetry from Pomeron-Odderon interference in hard
  diffractive pi+pi- -electroproduction

abstract:
  The interference of Pomeron and Odderon amplitudes gives rise to a charge
asymmetry in the diffractive electroproduction of a pi+pi- -pair. We calculate
this charge asymmetry in perturbative QCD in the Born approximation and on the
leading Q^2-level. The numerical evaluation shows a sizeable asymmetry in an
experimentally accessible kinematical region. We find a characteristic
m_{pi+pi} -dependence mainly dictated by the relevant Breit-Wigner-amplitudes
and the corresponding phase-shifts.


title: Spin-dependent Fragmentation Functions

abstract:
  I will give an overview on fragmentation functions with particular emphasis
on spin-dependence. A straightforward classification scheme permits to label
all independent fragmentation functions for a given physical situation in an
unambiguous way. In the context of light-cone quantisation the leading twist
fragmentation functions have an intuitive probabilistic interpretation.


title: Inflatonic Solitons In Running Mass Inflation

abstract:
  The inflaton condensate associated with a global symmetry can fragment into
quasistable Q balls, provided the inflaton oscillations give rise to an
effective equation of state with negative pressure. We study chaotic inflation
with a running inflaton mass and show that, depending on the sign of the
radiative mass correction, the process of fragmentation into inflatonic Q balls
can actually take place even though no net charge exists. If the main decay
channel of the Q ball is to fermions, the universe will be reheated slowly via
surface evaporation.


title:
Antineutrino-neutrino and antineutrino-electron resonant annihilation
  through rho and other vector mesons

abstract:
  The \bar{nu}e^- --> pi^- pi^0 and nu e^+ --> pi^+ pi^0 reaction have a
resonant structure whenever the energy of the s--channel equals the mass of a
J^P=1^- vector meson. The resonant cross sections are of the order 10^{-38}
cm^2 and correspond to cosmic ray antineutrino energies in the range 0.2 to 2
TeV. A similar structure occurs in the annihilation of cosmic ray antineutrinos
with a relic (background) neutrino. For m_{nu} <= 10^{-3} eV the resonant
energy is above GZK limit and their decay products include multiple
gamma--rays. Possible detection schemes are discussed, especially those which
rely on Cherenkov radiation.


title:
Radial excited states of the nucleon in quark models with dynamical
  confinement

abstract:
  The Roper state is described in the framework of the chiral chromodielectric
model as a single quark excitation in self-consistent meson potentials. The
interplay between quark and meson excitations is discussed and we emphasise the
role of non-quark degrees of freedom in the electroproduction of nucleon
excitations.


title: A possible origin of superconducting currents in cosmic strings

abstract:
  The scattering and capture of right-handed neutrinos by an Abelian cosmic
string in the SO(10) grand unification model are considered. The scattering
cross-section of neutrinos per unit length due to the interaction with the
gauge and Higgs fields of the string is much larger in its scaling regime than
in the friction one because of the larger infrared cutoff of the former.The
probability of capture in a zero mode of the string accompanied by the emission
of a gauge or Higgs boson shows a resonant peak for neutrino momentum of the
order of its mass. Considering the decrease of number of strings per unit
comoving volume in the scaling epoch the cosmological consequences of the
superconducting strings formed in this regime will be much smaller than those
which could be produced already in the friction one.


title: New supersymmetric source of neutrino masses and mixings

abstract:
  Conventionally, neutrino masses in a supersymmetric theory arise from
non-renormalizable lepton-number (L)-violating operators in the superpotential.
The alternative possibility of having such operators in the Kahler potential as
the dominant source of neutrino masses has very interesting implications and
differences with respect to the standard scenario: first, the scale of
L-violation can be lowered dramatically and neutrino masses have a different
tan beta-dependence; second, the renormalization of these operators has
remarkable properties: in many cases it improves drastically the stability of
neutrino textures against radiative corrections, while in others it makes
possible to generate radiatively large mixing angles in a natural way. In
particular, the mass splitting and mixing angle of solar neutrinos (LAMSW
solution) can be explained as a purely radiative effect.


title:
Landau-Khalatnikov-Fradkin Transformations and the Fermion Propagator in
  Quantum Electrodynamics

abstract:
  We study the gauge covariance of the massive fermion propagator in three as
well as four dimensional Quantum Electrodynamics (QED). Starting from its value
at the lowest order in perturbation theory, we evaluate a non-perturbative
expression for it by means of its Landau-Khalatnikov-Fradkin (LKF)
transformation. We compare the perturbative expansion of our findings with the
known one loop results and observe perfect agreement upto a gauge parameter
independent term, a difference permitted by the structure of the LKF
transformations.


title: Emission angle dependent pion interferometry at RHIC and beyond

abstract:
  We use hydrodynamics to generate freeze-out configurations for non-central
heavy-ion collisions at present and future collider energies. Such collisions
are known to produce strong elliptic flow. The accompanying space-time
structure of the source at freeze-out is analyzed using pion interferometry.
Between RHIC and LHC energies the source deformation in the transverse plane
changes sign. This leaves characteristic signatures in the emission angle
dependence of the HBT radii.


title: Non linear gluon evolution in path-integral form

abstract:
  We explore and clarify the connections between two different forms of the
renormalisation group equations describing the quantum evolution of hadronic
structure functions at small $x$. This connection is established via a Langevin
formulation and associated path integral solutions that highlight the
statistical nature of the quantum evolution, pictured here as a random walk in
the space of Wilson lines. The results confirm known approximations, form the
basis for numerical simulations and widen the scope for further analytical
studies.


title:
Comparing different hard-thermal-loop approaches to quark number
  susceptibilities

abstract:
  We compare our previously proposed hard-thermal-loop (HTL) resummed
calculation of quark number susceptibilities using a self-consistent two-loop
approximation to the quark density with a recent calculation of the same
quantity at the one-loop level in a variant of HTL-screened perturbation
theory. Besides pointing out conceptual problems with the latter approach, we
show that it severely over-includes the leading-order interaction effects while
including none of the plasmon term which after all is the reason to construct
improved resummation schemes.


title: Penguin Pollution in B->pi pi

abstract:
  In the presence of penguin contributions, the indirect CP asymmetry in
B0(t)->pi+ pi- measures some effective (``polluted'') angle 2alpha_{eff}. The
angle 2theta=2alpha_{eff}-2alpha, parameterizes the size of the penguin
pollution. A new, most stringent upper bound on |2theta|, requiring the
measurement of of BR(B+ -> pi+ pi0) and an upper bound on B00 \equiv {1\over 2}
[BR(B0 -> pi0 pi0) + BR(B0bar -> pi0 pi0)] is discussed. An interesting
consequence of this bound, is a lower limit on B00. The summer update of the
branching ratios and asymmetries in B->pi pi modes is expected to provide a
more precise picture of the size of penguin pollution.


title:
Schwinger-Dyson Analysis of Dynamical Symmetry Breaking on a Brane with
  Bulk Yang-Mills Theory

abstract:
  The dynamically generated fermion mass is investigated in the flat brane
world with (4+delta)-dimensional bulk space-time, and in the Randall-Sundrum
(RS) brane world. We consider the bulk Yang-Mills theory interacting with the
fermion confined on a four-dimensional brane. Based on the effective theory
below the reduced cutoff scale on the brane, we formulate the Schwinger-Dyson
equation of the brane fermion propagator. By using the improved ladder
approximation we numerically solve the Schwinger-Dyson equation and find that
the dynamical fermion mass is near the reduced cutoff scale on the brane for
the flat brane world with delta >= 3 and for the RS brane world. In RS brane
world KK excited modes of the bulk gauge field localized around the y = pi R
brane and it enhances the dynamical symmetry breaking on the brane. The decay
constant of the fermion and the anti-fermion composite operator can be taken to
be the order of the electroweak scale much smaller than the Planck scale.
Therefore electroweak mass scale can be realized from only the Planck scale in
the RS brane world due to the fermion and the anti-fermion pair condensation.
That is a dynamical realization of Randall-Sundrum model which solves the
weak-Planck hierarchy problem.


title: Charged Higgs in Models with Singlet Neutrino in Large Extra Dimensions

abstract:
  The charged Higgs decay in the channel H^- ->tau_L^- nu in models with a
singlet neutrino can provide a test of large extra dimensions models with TeV
scale quantum gravity since in the standard two Higgs doublet model type II,
H^- -> tau_L^- nu is suppressed. In the present study, we focus on the decay
H^- -> tau_L^- nu at the LHC for Higgs masses larger than the top-quark mass.


title: Effective field theory approach to structure functions at small x

abstract:
  We relate the structure functions of deep inelastic lepton-nucleon scattering
to current-current correlation functions in a Euclidean field theory depending
on a parameter r. The r-dependent Hamiltonian of the theory is P0-(1-r)P3, with
P0 the usual Hamiltonian and P3 the third component of the momentum operator.
We show that small x in the structure functions correspond to the small r limit
of the effective theory. We argue that for r->0 there is a critical regime of
the theory where simple scaling relations should hold. We show that in this
framework Regge behaviour of the structure functions obtained with the hard
pomeron ansatz corresponds to a scaling behaviour of the matrix elements in the
effective theory where the intercept of the hard pomeron appears as a critical
index. Explicit expressions for various analytic continuations of structure
functions and matrix elements are given as well as path integral
representations for the matrix elements in the effective theory. Our aim is to
provide a framework for truely nonperturbative calculations of structure
functions at small x for arbitrary Q^2


title:
Sum rules for total hadronic widths of light mesons and rectilineal
  stitch of the masses on the complex plane

abstract:
  Mass formulae for light meson multiplets derived by means of exotic
commutator technique are written for complex masses and considered as complex
mass sum rules (CMSR). The real parts of the (CMSR) give the well known mass
formulae for real masses (Gell-Mann--Okubo, Schwinger and Ideal Mixing ones)
and the imaginary parts of CMSR give appropriate sum rules for the total
hadronic widths - width sum rules (WSR). Most of the observed meson nonets
satisfy the Schwinger mass formula (S nonets). The CMSR predict for S nonet
that the points $(m,\Gamma{})$ form the rectilinear stitch (RS) on the complex
mass plane. For low-mass nonets WSR are strongly violated due to
``kinematical'' suppression of the particle decays, but the violation decreases
as the mass icreases and disappears above $\sim 1.5 GeV$. The slope $k_s$ of
the RS is not predicted, but the data show that it is negative for all S nonets
and its numerical values are concentrated in the vicinity of the value -0.5. If
$k_s$ is known for a nonet, we can evaluate ``kinematical'' suppressions of its
individual particles. The masses and the widths of the S nonet mesons submit to
some rules of ordering which matter in understanding the properties of the
nonet. We give the table of the S nonets indicating masses, widths, mass and
width orderings. We show also mass-width diagrams for them. We suggest to
recognize a few multiplets as degenerate octets. In Appendix we analyze the
nonets of $1^+$ mesons.


title:
QCD Analysis of Polarized Scattering Data and New Polarized Parton
  Distributions

abstract:
  In this talk results from a new QCD analysis in leading (LO) and
next--to--leading (NLO) order are presented. New parametrizations of the
polarized quark and gluon densities are derived together with parametrizations
of their fully correlated 1$\sigma$ error bands. Furthermore the value of
$\alpha_s(M_Z^2)$ is determined. Finally a number of low moments of the
polarized parton densities are compared with results from lattice simulations.


title:
Soft and Collinear Radiation and Factorization in Perturbation Theory
  and Beyond

abstract:
  Power corrections to differential cross sections near a kinematic threshold
are analysed by Dressed Gluon Exponentiation. Exploiting the factorization
property of soft and collinear radiation, the dominant radiative corrections in
the threshold region are resummed, yielding a renormalization-scale-invariant
expression for the Sudakov exponent. The interplay between Sudakov logs and
renormalons is clarified, and the necessity to resum the latter whenever power
corrections are non-negligible is emphasized. The presence of power-suppressed
ambiguities in the exponentiation kernel suggests that power corrections
exponentiate as well. This leads to a non-perturbative factorization formula
with non-trivial predictions on the structure of power corrections, which can
be contrasted with the OPE. Two examples are discussed. The first is
event-shape distributions in the two-jet region, where a wealth of precise data
provides a strong motivation for the improved perturbative technique and an
ideal situation to study hadronization. The second example is deep inelastic
structure functions. In contrast to event shapes, structure functions have an
OPE. However, since the OPE breaks down at large x, it does not provide a
practical framework for the parametrization of power corrections. Performing a
detailed analysis of twist 4 it is shown precisely how the twist-2 renormalon
ambiguity eventually cancels out. This analysis provides a physical picture
which substantiates the non-perturbative factorization conjecture.


title: Two-Photon Annihilation into Baryon-Antibaryon Pairs

abstract:
  We study the handbag contribution to two-photon annihilation into
baryon-antibaryon pairs at large energy and momentum transfer. We derive
factorization of the process amplitude into a hard gamma gamma -> q qbar
subprocess and form factors describing the soft q qbar -> B Bbar transition,
assuming that the process is dominated by configurations where the (anti)quark
approximately carries the full momentum of the (anti)baryon. The form factors
represent moments of time-like generalized parton distributions, so-called B
Bbar distribution amplitudes. A characteristic feature of the handbag mechanism
is the absence of isospin-two components in the final state, which in
combination with flavor symmetry provides relations among the form factors for
the members of the lowest-lying baryon octet. Assuming dominance of the handbag
contribution, we can describe current experimental data with form factors of
plausible size, and predict the cross sections of presently unmeasured B Bbar
channels.


title:
Comment on ``Electron Mass Operator in a Strong Magnetic Field and
  Dynamical Chiral Symmetry Breaking"

abstract:
  This is a comment on the paper ``Electron Mass Operator in a Strong Magnetic
Field and Dynamical Chiral Symmetry Breaking" by A. V. Kuznetsov and N. V.
Mikheev [Phys. Rev. Lett. 89 (2002) 011601]. We show that the main conclusions
of the paper are incorrect.


title: The NLO Jet Vertex for Mueller-Navelet and Forward Jets: the Gluon Part

abstract:
  In this paper we complete our calculation of the NLO jet vertex which is part
of the cross section formulae for the production of Mueller Navelet jets at
hadron hadron colliders and of forward jets in deep inelastic electron proton
scattering.


title:
Helicity conservation in inclusive nonleptonic decay B to VX: Test of
  long-distance final state interaction

abstract:
  The polarization measurement in the inclusive B decay provides us with a
simple test of how much the long-distance final-state interaction takes place
as the energy of the observed meson varies in the final state. We give the
expectation of the perturbative QCD for the energy dependence of the helicity
fractions in a semiquantitative form. Experiment will tell us for which decay
processes the perturbative calculation should be applicable.


title:
Underlying A_4 Symmetry for the Neutrino Mass Matrix and the Quark
  Mixing Matrix

abstract:
  The discrete non-Abelian symmetry $A_4$, valid at some high-energy scale,
naturally leads to degenerate neutrino masses, without spoiling the hierarchy
of charged-lepton masses. Realistic neutrino mass splittings and mixing angles
(one of which is necessarily maximal and the other large) are then induced
radiatively in the context of softly broken supersymmetry. The quark mixing
matrix is also calculable in a similar way. The mixing parameter $U_{e3}$ is
predicted to be imaginary, leading to maximal CP violation in neutrino
oscillations. Neutrinoless double beta decay and $\tau \to \mu \gamma$ should
be in the experimentally accessible range.


title:
ALPGEN, a generator for hard multiparton processes in hadronic
  collisions

abstract:
  This paper presents a new event generator, ALPGEN, dedicated to the study of
multiparton hard processes in hadronic collisions. The code performs, at the
leading order in QCD and EW interactions, the calculation of the exact matrix
elements for a large set of parton-level processes of interest in the study of
the Tevatron and LHC data. The current version of the code describes the
following final states: (W -> ffbar') QQbar+ N jets (Q being a heavy quark, and
f=l,q), with N<=4; (Z/gamma* -> f fbar)+QQbar+Njets (f=l,nu), with N<=4; (W ->
ffbar') + charm + N jets (f=l,q), N<= 5; (W -> f fbar') + N jets (f=l,q) and
(Z/gamma* -> f fbar)+ N jets (f=l,nu), with N<=6; nW+mZ+lH+N jets, with
n+m+l+N<=8 and N<=3 including all 2-fermion decay modes of W and Z bosons, with
spin correlations; Q Qbar+N jets (N<=6) with t -> b f fbar' decays and relative
spin correlations included if Q=t; Q Qbar Q' Qbar'+N jets, with Q and Q' heavy
quarks (possibly equal) and N<=4; H Q Qbar+N jets (N<=4) with t -> b f fbar'
decays and relative spin correlations included if Q=t; N jets, with N<=6.
Parton-level events are generated, providing full information on their colour
and flavour structure, enabling the evolution of the partons into fully
hadronised final states.


title: Thermal Pions ns Isospin Chemical Potential Effects

abstract:
  The density corrections, in terms of the isospin chemical potential $\mu_I$,
to the mass of the pions are investigated in the framework of the SU(2) low
energy effective chiral invariant lagrangian. As a function of temperature and
$\mu_I =0$, the mass remains quite stable, starting to grow for very high
values of $T$, confirming previous results. However, the dependence for a
non-vanishing chemical potential turns out to be much more dramatic. In
particular, there are interesting corrections to the mass when both effects
(temperature and chemical potential) are simultaneously present. At zero
temperature the $\pi ^{\pm}$ should condensate when $\mu_{I} = \mp m_{\pi}$.
This is not longer valid anymore at finite $T$. The mass of the $\pi_0$
acquires also a non trivial dependence on $\mu_I$ at finite $T$.


title: Proton-antiproton annihilation into two photons at large s

abstract:
  Exclusive proton-antiproton annihilation into two photons can be viewed as
the Compton process in the crossed channel. At large s (~10 GeV^2) and |t|,|u|
s this process can be described by a generalized partonic 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 ('handbag
graph'). The transition of the p-pbar system to a q-qbar pair through soft
interactions is described by double distributions, which can be related to the
timelike proton elastic form factors as well as, by crossing symmetry, to the
usual quark--antiquark distributions in the nucleon. We estimate that this
reaction should be observable with reasonable statistics at the proposed
1.5..15 GeV high-luminosity antiproton storage ring (HESR) at GSI.


title: Evidence for Neutrino Being Likely a Superluminal Particle

abstract:
  Experimental evidence and theoretical argument in favor the claim of neutrino
being likely a superluminal particle, a tachyon, are discussed from six aspects
with details.


title: B0 - B0 bar mixing, B -> J/psi K_S and B -> X_d gamma in general MSSM

abstract:
  We consider the gluino-mediated SUSY contributions to B0 - B0 bar mixing, B
-> J/psi K_S and B -> X_d gamma in the mass insertion approximation. We find
the LL mixing parameter can be as large as |delta_{13}^d_{LL}| < 2*10^-1, but
the LR mixing is strongly constrained by the B -> X_d gamma branching ratio and
we find |delta_{13}^d_{LR}| < 10^-2. The implications for the direct CP
asymmetry in B -> X_d gamma and the dilepton charge asymmetry (A_{ll}) are also
discussed, where substantial deviations from the standard model predictions are
possible.


title: Diffractive Vector Meson Production in k_t-Factorization Approach

abstract:
  We describe the current status of the diffractive vector meson production
calculations within the k_t-factorization approach. Since the amplitude of the
vector meson production off a proton is expressed via the differential gluon
structure function (DGSF), we take a closer look at the latter and present
results of our new improved determination of the DGSF from the structure
function F_2p. Having determined the differential glue, we proceed to the
k_t-factorization results for the production of various vector mesons. We argue
that the properties of the vector meson production can reveal the internal
spin-angular and radial structure of the vector meson.


title: Phenomenology of heterotic M-theory with five-branes

abstract:
  We analyze some phenomenological implications of heterotic M-theory with
five-branes. Recent results for the effective 4-dimensional action are used to
perform a systematic analysis of the parameter space, finding the restrictions
that result from requiring the volume of the Calabi-Yau to remain positive.
Then the different scales of the theory, namely, the 11-dimensional Planck
mass, the compactification scale and the orbifold scale, are evaluated.
  The expressions for the soft supersymmetry-breaking terms are computed and
discussed in detail for the whole parameter space. With this information we
study the theoretical predictions for the supersymmetric contribution to the
muon anomalous magnetic moment, using the recent experimental result as a
constraint on the parameter space. We finally analyze the neutralino as a dark
matter candidate in this construction. In particular, the neutralino-nucleon
cross-section is computed and compared with the sensitivities explored by
present dark matter detectors.


title: Observable Consequences of Partially Degenerate Leptogenesis

abstract:
  In the context of the seesaw mechanism, it is natural that the large solar
and atmospheric neutrino mixing angles originate separately from large 2 by 2
mixings in the neutrino and charged-lepton sectors, respectively, and large
mixing in the neutrino couplings is in turn more plausible if two of the heavy
singlet neutrinos are nearly degenerate. We study the phenomenology of this
scenario, calculating leptogenesis by solving numerically the set of coupled
Boltzmann equations for out-of-equilibrium heavy singlet neutrino decays in the
minimal supersymmetric seesaw model. The near-degenerate neutrinos may weigh <
10^8 GeV, avoiding the cosmological gravitino problem. This scenario predicts
that Br(mu to e gamma) should be strongly suppressed, because of the small
singlet neutrino masses, whilst Br(tau to mu gamma) may be large enough to be
observable in B-factory or LHC experiments. If the light neutrino masses are
hierarchical, we predict that the neutrinoless double-beta decay parameter
m_{ee} is approximately sqrt{Delta m_{sol}^2} times sin^2 theta_{12}.


title: What Do We Know About the Strange Magnetic Radius?

abstract:
  We analyze the q^2-dependence of the strange magnetic form factor, \GMS(q^2),
using heavy baryon chiral perturbation theory (HBChPT) and dispersion
relations. We find that in HBChPT a significant cancellation occurs between the
O(p^2) and O(p^3) loop contributions. Consequently, the slope of \GMS at the
origin displays an enhanced sensitivity to an unknown O(p^3) low-energy
constant. Using dispersion theory, we estimate the magnitude of this constant,
show that it may have a natural size, and conclude that the low-q^2 behavior of
\GMS could be dominated by nonperturbative physics. We also discuss the
implications for the interpretation of parity-violating electron scattering
measurements used to measure \GMS(q^2).


title:
The invariant formulation of special relativity, or the "true
  transformations relativity", and electrodynamics

abstract:
  In the invariant approach to special relativity (SR), which we call the
''true transformations (TT) relativity,'' a physical quantity in the
four-dimensional spacetime is mathematically represented either by a true
tensor or equivalently by a coordinate-based geometric quantity comprising both
components and a basis. This invariant approach differs both from the usual
covariant approach, which mainly deals with the basis components of tensors in
a specific, i.e., Einstein's coordinatization of the chosen inertial frame of
reference,.and the usual noncovariant approach to SR in which some quantities
are not tensor quantities, but rather quantities from ''3+1'' space and time,
e.g., the synchronously determined spatial length. This noncovariant
formulation of SR is called the ''apparent transformations (AT) relativity.''
The principal difference between the ''TT relativity'' and the ''AT
relativity'' arises from the difference in the concept of sameness of a
physical quantity for different observers. In the second part of this paper we
present the invariant formulation of electrodynamics with the electromagnetic
field tensor F^{ab}, and also the equivalent formulation in terms of the
four-vectors of the electric E^{a} and magnetic B^{a} fields.


title:
Double logarithms, $ln^2(1/x)$, and the NLO DGLAP evolution for the
  non-singlet component of the nucleon spin structure function, $g_1$

abstract:
  Theoretical predictions show that at low values of Bjorken $x$ the spin
structure function, $g_1$ is influenced by large logarithmic corrections,
$ln^2(1/x)$, which may be predominant in this region. These corrections are
also partially contained in the NLO part of the standard DGLAP evolution. Here
we calculate the non-singlet component of the nucleon structure function,
$g_1^{NS}=g_1^p-g_1^n$, and its first moment, using a unified evolution
equation. This equation incorporates the terms describing the NLO DGLAP
evolution and the terms contributing to the $ln^2(1/x)$ resummation. In order
to avoid double counting in the overlapping regions of the phase-space, a
unique way of including the NLO terms into the unified evolution equation is
proposed. The scheme-independent results obtained from this unified evolution
are compared to the NLO fit to experimental data, GRSV'2000. Analysis of the
first moments of $g_1^{NS}$ shows that the unified evolution including the
$ln^2(1/x)$ resummation goes beyond the NLO DGLAP analysis. Corrections
generated by double logarithms at low $x$ influence the $Q^2$-dependence of the
first moments strongly.


title: Leptogenesis and low-energy phases

abstract:
  In supersymmetric models, the CP asymmetry produced in the decay of the
lightest right-handed neutrino, $\equiv epsilon$, can be written as a function
of weak scale parameters. We introduce a way of separating epsilon into
contributions from the various weak-scale phases, and study the contribution of
potentially measurable neutrino phases to leptogenesis. We find that the
Majorana phase phi', which could have observable effects on neutrinoless double
beta decay, is important for epsilon unless there are cancellations among
phases. If the phase delta can be measured at a neutrino factory, then it
contributes significantly to epsilon over much of parameter space.


title:
Exclusive photoproduction of hard dijets and magnetic susceptibility of
  QCD vacuum

abstract:
  We argue that coherent production of hard dijets by linearly polarized real
photons can provide direct evidence for chirality violation in hard processes,
the first measurement of the magnetic susceptibility of the quark condensate
and the photon distribution amplitude. It can also serve as a sensitive probe
of the generalized gluon parton distribution. Numerical calculations are
presented for HERA kinematics.


title: Nucleon hologram with exclusive leptoproduction

abstract:
  Hard exclusive leptoproductions of real photons, lepton pairs and mesons are
the most promising tools to unravel the three-dimensional picture of the
nucleon, which cannot be deduced from conventional inclusive processes like
deeply inelastic scattering.


title: 5D SUSY Orbifold SU(6) GUT and Pseudo-Goldstone Higgs Doublets

abstract:
  We construct a 5D SUSY SU(6) GUT on an $S^{(1)}/Z_2\tm Z_2'$ orbifold. The
first stage of gauge symmetry breaking occurs through compactification and a
specific selection of boundary conditions. Additional symmetries play a crucial
role for the generation of $\mu $ and $B\mu $ terms of appropriate values: with
a $SU(2)_{cus}$ custodial symmetry the Higgs doublets naturally emerge as
massless pseudo-Goldstone bosons in the unbroken SUSY limit. After SUSY
breaking they get masses of the order of the weak scale. If instead of
$SU(2)_{cus}$ a discrete $Z_5$ symmetry is applied the Higgs doublet's masses
are still adequately suppressed, but they are not pseudo-Goldstones. The $Z_5$
discrete symmetry also can be very important for GUT scale generation and an
all order hierarchy. Fermion masses are naturally generated and nicely blend
with additional symmetries. In the considered scenario unification of the three
gauge couplings occurs near $10^{16}$ GeV.


title: The solar neutrino puzzle: present situation and future scenarios

abstract:
  We present a short review of the existing evidence in favor of neutrino mass
and neutrino oscillations which come from different kinds of experiments. We
focus our attention in particular on solar neutrinos, presenting a global
updated phenomenological analysis of all the available data and we comment on
different possible future scenarios.


title: Estimate of the Collins function in a chiral invariant approach

abstract:
  We estimate the Collins function at a low energy scale by calculating the
fragmentation of a quark into a pion at the one-loop level in the chiral
invariant model of Manohar and Georgi. We give a useful parametrization of our
results and we briefly discuss different spin and/or azimuthal asymmetries
containing the Collins function and measurable in semi-inclusive DIS and e+ e-
annihilation


title: Higgs-Mediated tau -> 3 mu in the Supersymmetric Seesaw Model

abstract:
  Recent observations of neutrino oscillations imply non-zero neutrino masses
and flavor violation in the lepton sector, most economically explained by the
seesaw mechanism. Within the context of supersymmetry, lepton flavor violation
(LFV) among the neutrinos can be communicated by renormalization group flow to
the sleptons and from there to the charged leptons. We show that LFV can appear
in the couplings of the neutral Higgs bosons, an effect that is strongly
enhanced at large tan(beta). In particular, we calculate the branching fraction
for tau -> 3 mu and mu -> 3 e mediated by Higgs and find that they can be as
large as 10^{-7} and 5x10^{-14} respectively. These modes, along with B^0 -> mu
mu, can provide important evidence for supersymmetry before direct discovery of
supersymmetric partners occurs. Along with tau -> mu gamma and mu -> e gamma,
they can also provide key insights into the form of the neutrino Yukawa mass
matrix.


title: Invisible Decays of the Supersymmetric Higgs and Dark Matter

abstract:
  We discuss effects of the light sparticles on decays of the lightest Higgs in
a supersymmetric model with nonuniversal gaugino masses at the high scale,
focusing on the `invisible' decays into neutralinos. These can impact
significanlty the discovery possibilities of the lightest Higgs at the LHC. We
show that due to these decays, there exist regions of the $M_2-\mu$ space where
the B.R. $(h \to \gamma \gamma)$ becomes dangerously low even after imposing
the LEP constraints on the sparticle masses, implying a possible preclusion of
its discovery in the $\gamma \gamma$ channel. We find that there exist regions
in the parameter space with acceptable relic density and where the ratio ${B.R.
(h \to \gamma \gamma)_{SUSY} \over B.R. (h \to \gamma \gamma)_{SM}}$ falls
below 0.6, implying loss of signal in the $\gamma \gamma$ channel. These
regions correspond to $\tilde \chi_1^+, \tilde \chi_2^0$ masses which should be
accessible already at the Tevatron. Further we find that considerations of
relic density put lower limit on the U(1) gaugino mass parameter $M_1$
independently of $\mu, \tan \beta$ and $m_0$.


title: SU(3) - Flavor Symmetry in $B \to VP$ Decays

abstract:
  In the framework of SU(3) symmetry, we present a general analysis of $B$
meson decays into two lighter uncharmed mesons (both pairs of pseudoscalar
mesons and pairs of vector and pseudoscalar mesons). From the analysis we find
constraints on $\gamma$ and discuss their validity. The most useful new
constraint is obtained by considering the decay modes $B^{0} \to K\pi$ and
$B^{+} \to \pi^{0}\pi^{+}$. In decays into pairs of vector and pseudeuscalar
mesons, no constraints can be obtained using SU(3) symmetry alone and further
assumptions are needed. Based on these assumptions, we obtain new (weaker)
constraints using $B^{0} \to \rho K/B^{0} \to K^{*}\pi$ and $B^{+} \to
\rho\pi$. We show that no other constraints can be obtained. We also suggest a
method to measure $\gamma$ using $B^{0}_{s} \to \rho\pi$ and $B^{0} \to
K^{*\pm}K^{\mp}$.


title:
The Effect of 4D Effective Cosmological Constant On The Stability of
  Randall-Sundrum Scenario

abstract:
  We study the Randall-Sundrum model with a small 4D effective cosmological
constant on the brane, and drive a corrected radion potential following the
Goldberger-Wise mechanism. We then discuss the effect of the 4D effective
cosmological constant on the stability of the brane-system, and find that to
quintessence determined by updated observation, the proper distance between the
two branes required to solve the hierarchy problem can exist. However, during
inflation, whether we can get an reasonable hierarchy scale is still uncertain.


title: Subleading Shape Functions and the Determination of |V_{ub}|

abstract:
  It is argued that the dominant subleading shape-function contributions to the
endpoint region of the charged-lepton energy spectrum in B -> X_u l nu decays
can be related in a model-independent way to an integral over the B -> X_s
gamma photon spectrum. The square root of the fraction of B -> X_u l nu events
with charged-lepton energy above E_0=2.2 GeV can be calculated with a residual
theoretical uncertainty from subleading shape-function effects that it safely
below the 10% level. These effects have therefore a minor impact on the
determination of |V_{ub}|.


title: Black hole evaporation with separated fermions

abstract:
  In models with a low quantum gravity scale, a well-motivated reason to expect
quark and lepton fields are localized but physically separated is to avoid
proton decay. This could happen in a ``fat-brane'' or in an additional,
orthogonal 1/TeV sized dimension in which the gauge and Higgs fields live
throughout. Black holes with masses of order the quantum gravity scale are
therefore expected to evaporate non-universally, preferentially radiating
directly into quarks or leptons but not both. Should black holes be copiously
produced at a future hadron collider, we find the ratio of final state jets to
charged leptons to photons is 113:8:1, which differs from previous analyses
that assumed all standard model fields live at the same point in the extra
dimensional space.


title: Higgs boson production at hadron colliders in NNLO QCD

abstract:
  We compute the total cross-section for direct Higgs boson production in
hadron collisions at NNLO in perturbative QCD. A new technique which allows us
to perform an algorithmic evaluation of inclusive phase-space integrals is
introduced, based on the Cutkosky rules, integration by parts and the
differential equation method for computing master integrals. Finally, we
discuss the numerical impact of the O(alpha_s^2) QCD corrections to the Higgs
boson production cross-section at the LHC and the Tevatron.


title: Improved Perturbative QCD Approach to the Bottomonium Spectrum

abstract:
  Recently it has been shown that the gross structure of the bottomonium
spectrum is reproduced reasonably well within the non-relativistic boundstate
theory based on perturbative QCD. In that calculation, however, the fine
splittings and the S-P level splittings are predicted to be considerably
narrower than the corresponding experimental values. We investigate the
bottomonium spectrum within a specific framework based on perturbative QCD,
which incorporates all the corrections up to O(alpha_S^5 m_b) and O(alpha_S^4
m_b), respectively, in the computations of the fine splittings and the S-P
splittings. We find that the agreement with the experimental data for the fine
splittings improves drastically due to an enhancement of the wave functions
close to the origin as compared to the Coulomb wave functions. The agreement of
the S-P splittings with the experimental data also becomes better. We find that
natural scales of the fine splittings and the S-P splittings are larger than
those of the boundstates themselves. On the other hand, the predictions of the
level spacings between consecutive principal quantum numbers depend rather
strongly on the scale mu of the operator \propto C_A/(m_b r^2). The agreement
of the whole spectrum with the experimental data is much better than the
previous predictions when mu \simeq 3-4 GeV for alpha_S(M_Z)=0.1181. There
seems to be a phenomenological preference for some suppression mechanism for
the above operator.


title:
Supersymmetric Seesaw without Singlet Neutrinos: Neutrino Masses and
  Lepton-Flavour Violation

abstract:
  We consider the supersymmetric seesaw mechanism induced by the exchange of
heavy SU(2)_W triplet states, rather than `right-handed' neutrino singlets, to
generate neutrino masses. We show that in this scenario the neutrino flavour
structure tested at low-energy in the atmospheric and solar neutrino
experiments is directly inherited from the neutrino Yukawa couplings to the
triplets. This allows us to predict the ratio of the tau --> mu gamma (or tau
--> e gamma) and mu --> e gamma decay rates in terms of the low-energy neutrino
parameters. Moreover, once the model is embedded in a grand unified model,
quark-flavour violation can be linked to lepton-flavour violation.


title: New Physics in B -> J/Psi K^*

abstract:
  Direct CP violation in B -> J/Psi K is a clean test for new physics. However,
the direct CP asymmetry will vanish if the new-physics amplitude has the same
strong phase as the standard-model amplitude. We show that this type of new
physics can still be detected via an angular analysis of the sister decay mode
B -> J/Psi K^*. Time-dependent measurements and tagging are not necessary.
Should new physics be found, this angular analysis can be used to obtain
information about the size of the new-physics parameters.


title: Charge Neutrality Effects on 2-flavor Color Superconductivity

abstract:
  The effect of electric and color neutrality on 2-flavor color
superconductivity has been investigated. It has been found that the effect of
the charge neutrality on a 2-flavor quark system is very different from that on
a 3-flavor system. The BCS diquark pair in 2-flavor color superconducting phase
has been largely reduced by the large Fermi momentum of electron, the diquark
condensate first increases with the increasing of quark's chemical potential
$\mu$,then decreases rapidly and finally disappears at about $\mu=535MeV$, at
which the thermodynamic potential equals to that in the neutral normal 2-flavor
quark matter.


title:
Kaluza-Klein States versus Winding States: Can Both Be Above the String
  Scale?

abstract:
  When closed strings propagate in extra compactified dimensions, a rich
spectrum of Kaluza-Klein states and winding states emerges. Since the masses of
Kaluza-Klein states and winding states play a reciprocal role, it is often
believed that either the lightest Kaluza-Klein states or the lightest winding
states must be at or below the string scale. In this paper, we demonstrate that
this conclusion is no longer true for compactifications with non-trivial shape
moduli. Specifically, we demonstrate that toroidal compactifications exist for
which all Kaluza-Klein states as well as all winding states are heavier than
the string scale. This observation could have important phenomenological
implications for theories with reduced string scales, suggesting that it is
possible to cross the string scale without detecting any states associated with
spacetime compactification.


title:
The CP-conserving two-Higgs-doublet model: the approach to the
  decoupling limit

abstract:
  A CP-even neutral Higgs boson with Standard-Model-like couplings may be the
lightest scalar of a two-Higgs-doublet model. We study the decoupling limit of
the most general CP-conserving two-Higgs-doublet model, where the mass of the
lightest Higgs scalar is significantly smaller than the masses of the other
Higgs bosons of the model. In this case, the properties of the lightest Higgs
boson are nearly indistinguishable from those of the Standard Model Higgs
boson. The first non-trivial corrections to Higgs couplings in the approach to
the decoupling limit are also evaluated. The importance of detecting such
deviations in precision Higgs measurements at future colliders is emphasized.
We also clarify the case in which a neutral Higgs boson can possess
Standard-Model-like couplings in a regime where the decoupling limit does not
apply. The two-Higgs-doublet sector of the minimal supersymmetric model
illustrates many of the above features.


title:
Radiative corrections to all charge assignments of heavy quark baryon
  semileptonic decays

abstract:
  In semileptonic decays of spin-1/2 baryons containing heavy quarks up to six
charge assignments for the baryons and lepton are possible. We show that the
radiative corrections to four of these possibilities can be directly obtained
from the final results of the two possibilities previously studied. There is no
need to recalculate integrals over virtual or real photon momentum or any
traces.


title:
Effective Degrees of Freedom at Chiral Restoration and the Vector
  Manifestation in HLS theory

abstract:
  The question as to what the relevant effective degrees of freedom at the
chiral phase transition are remains largely unanswered and must be addressed in
confronting both terrestrial and space laboratory observations purporting to
probe matter under extreme conditions. We address this question in terms of the
vector susceptibility \chi_V (VSUS in short) and the axial-vector
susceptibility \chi_A (ASUS in short) at the temperature-induced chiral
transition. We consider two possible, albeit simplified, cases that are
contrasting, one that is given by the standard chiral theory where only the
pions figure in the vicinity of the transition and the other that is described
by hidden local symmetry (HLS) theory with the Harada-Yamawaki vector
manifestation (VM) where nearly massless vector mesons also enter. We find that
while in the standard chiral theory, the pion velocity v_\pi proportional to
the ratio of the space component f_\pi^s of the pion decay constant over the
time component f_\pi^t tends to zero near chiral restoration with f_\pi^t\neq
0, in the presence of the vector mesons with vanishing mass, the result is
drastically different: HLS with VM {\it predicts} that \chi_V automatically
equals \chi_A in consistency with chiral invariance and that v_\pi\sim 1$ with
$f_\pi^t\approx f_\pi^s\to 0 as T\to T_c. These results are obtained in the
leading order in power counting but we expect their qualitative features to
remain valid more generally in the chiral limit thanks to the VM point.


title: Radius-dependent gauge unification in AdS5

abstract:
  We examine the relation of the 4-dimensional low energy coupling of bulk
gauge boson in a slice of AdS5 to the 5-dimensional fundamental couplings as a
function of the orbifold radius R. This allows us to address the gauge coupling
unification in AdS5 by means of the radius running as well as the conventional
momentum running. We then compute the radius dependence of 1-loop low energy
couplings in generic AdS5 theory with 4-dimensional supersymmetry, and discuss
the low energy predictions when the 5-dimensional couplings are assumed to be
unified.


title:
Prospects for Observing an Invisibly Decaying Higgs Boson in the t
  anti-t H Production at the LHC

abstract:
  The prospects for observing an invisibly decaying Higgs boson in the t anti-t
H production at LHC are discussed. An isolated lepton, reconstructed hadronic
top-quark decay, two identified b-jets and large missing transverse energy are
proposed as the final state signature for event selection. Only the Standard
Model backgrounds are taken into account. It is shown that the t anti-t Z, t
anti-t W, b anti-b Z and b anti-b W backgrounds can individually be suppressed
below the signal expectation. The dominant source of background remains the t
anti-t production. The key for observability will be an experimental selection
which allows further suppression of the contributions from the t anti-t events
with one of the top-quarks decaying into a tau lepton. Depending on the details
of the final analysis, an excess of the signal events above the Standard Model
background of about 10% to 100% can be achieved in the mass range m_H= 100-200
GeV.


title:
Matter effects and CP violating neutrino oscillations with
  non-decoupling heavy neutrinos

abstract:
  The evolution equation for active and sterile neutrinos propagating in
general anisotropic or polarized background environment is found and solved for
a special case when heavy neutrinos do not decouple, resulting in non-unitary
mixing among light neutrino states. Then new CP violating neutrino oscillation
effects appear. In contrast to the standard unitary neutrino oscillations these
effects can be visible even for two flavour neutrino transitions and even if
one of the elements of the neutrino mixing matrix is equal to zero. They do not
necessarily vanish with $\delta m^{2} \to 0$ and they are different for various
pairs of flavour neutrino transitions ($\nu_e \to \nu_\mu$), ($\nu_\mu \to
\nu_\tau$), ($\nu_\tau \to \nu_e$). Neutrino oscillations in vacuum and Earth's
matter are calculated for some fixed baseline experiments and a comparison
between unitary and non-unitary oscillations are presented. It is shown, taking
into account the present experimental constraints, that heavy neutrino states
can affect CP and T asymmetries. This is especially true in the case of
$\nu_\mu \to \nu_\tau$ oscillations.


title:
CP violations in the K and B meson systems in the SUSY models with
  (S_3)^3 flavor symmetry

abstract:
  Rare decays of B and K mesons and CP violations thereof are considered in
SUSY models with S_3^3 flavor symmetry. SUSY contributions to epsilon_K and
epsilon'/epsilon_K can be large, but not to B0 - B0 bar mixing because of
strong constraint from B -> X_d gamma for (delta^d_{13})_{LR}. Still large
deviations from the SM predictions are possible in the branching ratio for B ->
X_d gamma and direct CP violations therein, even if the KM angle gamma is in
the range preferred by the SM CKM fit. Experimental study of B -> X_d gamma is
strongly recommended as a probe for new physics with nontrivial flavor
structure in the (13) mixing.


title: Multiplicities and Correlations at LEP

abstract:
  A brief review on recent charge multiplicity and correlation measurements at
LEP is given. The measurements of unbiased gluon jet multiplicity are
discussed. Recent results on charged particle Bose-Einstein and Fermi-Dirac
correlations at LEP1 are reported. New results on two-particle correlations of
neutral pions are given. Correlations of more than two particles (high-order
correlations) obtained using different methods are performed. Recent
Bose-Einstein correlation measurements at LEP2 are discussed.


title: On the hierarchy of neutrino masses

abstract:
  We present a model of neutrino masses combining the seesaw mechanism and
strong Dirac mass hierarchy and at the same time exhibiting a significantly
reduced hierarchy at the level of active neutrino masses. The heavy Majorana
masses are assumed to be degenerate. The suppression of the hierarchy is due to
a symmetric and unitary operator R whose role is discussed. The model gives
realistic mixing and mass spectrum. The mixing of atmospheric neutrinos is
attributed to the charged lepton sector whereas the mixing of solar neutrinos
is due to the neutrino sector. Small U_e3 is a consequence of the model. The
masses of the active neutrinos are given by $\mu_3\approx\sqrt{\Delta m_{@}^2}$
and $\mu_1/\mu_2\approx \tan^2\theta_\odot$.


title: Forward Jets and BFKL at Hadron Colliders

abstract:
  We present results on dijet and W+dijet production at hadron colliders
obtained by supplementing the leading log BFKL resummation with energy and
momentum conservation. For pure dijet production, the inclusion of the BFKL
radiation in the energy conservation leads to a decrease in the parton flux
sufficient to counter-act the expected exponential increase in the cross
section obtained for the partonic cross section. Other BFKL signatures such as
the dijet azimuthal angle decorrelation do still survive.


title: Analytic Continuation of Massless Two-Loop Four-Point Functions

abstract:
  We describe the analytic continuation of two-loop four-point functions with
one off-shell external leg and internal massless propagators from the Euclidean
region of space-like $1\to 3$ decay to Minkowskian regions relevant to all
$1\to 3$ and $2\to 2$ reactions with one space-like or time-like off-shell
external leg. Our results can be used to derive two-loop master integrals and
unrenormalized matrix elements for hadronic vector-boson-plus-jet production
and deep inelastic two-plus-one-jet production, from results previously
obtained for three-jet production in electron--positron annihilation.


title: Colour dipoles and deeply virtual Compton scattering

abstract:
  I report on an analysis of Deeply Virtual Compton Scattering (DVCS) within
the dipole model, done in collaboration with M. McDermott and G. Shaw. The two
models considered here are distinct in their structure and implications. They
both agree with the available cross-section data on DVCS from HERA. Predictions
for various asymmetries are also given.


title:
Behaviour of S-Wave poles Near Threshold and the Scalar Meson Nonet
  Below 1 GeV

abstract:
  We describe the behaviour at threshold of S-wave poles of the scattering
matrix within a four-parameter model for non-exotic meson-meson scattering.
This model accommodates all non-exotic mesons, hence also the light scalar
mesons, as resonances and bound states characterised by complex singularities
of the scattering amplitude as a function of the total invariant mass.
  The majority of the full S-matrix mesonic poles stem from an underlying
confinement spectrum. However, the light scalar mesons K0*(830), a0(980),
f0(400--1200), and f0(980) do not, but instead originate in 3P0-barrier
semi-bound states. We show that the behaviour of the corresponding poles is
identical at threshold.


title: Non-thermal Leptogenesis from the Heavier Majorana Neutrinos

abstract:
  We investigate a scheme for making leptogenesis by means of the CP violating
decays of the seesaw Majorana neutrinos proposed by Fukugita and Yanagida.
However, in order to avoid the wash-out of the produced lepton number we
propose the production of the Majorana neutrinos to occur non-thermally and
sufficiently late. After this time, in consequence, the B-L (baryon minus
lepton) quantum number becomes a good ``accidental symmetry'' protecting the
asymmetry produced. This non-thermal leptogenesis at late time is realized by a
boson decaying into the Majorana neutrinos with a long lifetime. Suggestively
this boson could correspond to a scalar field which causes the cosmic
inflation, the inflaton, and thus its decay means really the reheating of the
Universe. We find that this mechanism works well even if the lightest Majorana
neutrinos are not produced sufficiently or not present, and the decays of the
heavier seesaw Majorana neutrinos can be responsible to the baryon asymmetry in
the present Universe, as we illustrate by the example of the family replicated
gauge group model.


title: CP Violation from Dimensional Reduction: Examples in 4+1 Dimensions

abstract:
  We provide simple examples of the generation of complex mass terms and hence
CP violation through dimensional reduction.


title: The Lambda-Measure and the Generalised Dipoles in the Lund Model

abstract:
  We demonstrate that the multiple gluon emission phase space in the dipole
cascade model has a strong linear correlation with the number of gluons
emitted. The number of gluons per unit available phase space at a certain
resolution scale is found to be remarkably independent of the cms energy and
global event properties like thrust, and even changes in the ordering variable
or resolution scale. We show that the distribution of sizes of gluon-gluon
dipoles in a parton cascade has stability properties which are sufficient to
account for those of the phase space variable. We observe that certain more
abstract entities, defined in the context of hadronisation and related to the
gluon emission phase space, share those properties of colour dipoles and name
them Generalised Dipoles. We also present an analytical model to qualitatively
describe our findings.


title:
Trilepton Events and B_s -> mu^+ mu^- : No-lose for mSUGRA at the
  Tevatron?

abstract:
  We study the Tevatron search potential for minimal supergravity (mSUGRA) and
find two observables which reveal complementary information on the mSUGRA
parameter space: the ``gold-plated'' decays of charginos/neutralinos to
trilepton final states and the rare decay B_s-> mu^+ mu^-. For the universal
gaugino mass, M_{1/2} below 250 GeV and for the universal scalar fermion mass,
M_0 outside of 200-370 GeV we face a ``no-lose'' situation for the Tevatron: If
tan(beta) < 30, the Tevatron has a chance to see the trilepton events but not
B_s -> mu^+ mu^- during Run IIa, whereas for larger tan(beta) the trilepton
events become invisible (at least with an integrated luminosity of 2 fb^{-1})
while B_s -> mu^+ mu^- is enhanced to an observable level. For this study we
perform an updated analysis of the trilepton signature which includes the full
set of the decay matrix elements and spin correlations. This leads to a new,
more promising search reach for the Tevatron.


title: Diffractive heavy vector meson production from the BFKL equation

abstract:
  Diffractive heavy vector meson photoproduction accompanied by proton
dissociation is studied for arbitrary momentum transfer. The process is
described by the non-forward BFKL equation, for which a complete analytical
solution is found, giving the scattering amplitude. The impact of non-leading
corrections to the BFKL equation is also analysed. Results are compared to the
HERA data on J/psi production.


title: CP violation and cosmology

abstract:
  Microscopic CP violation has profound cosmological consequences. In
particular, it is related to the baryon asymmetry of the universe. A successful
baryogenesis requires new sources of CP violation in addition to the
Cabibbo-Kobayashi-Maskawa phase. I give a brief review of the possibilities.


title: Estimation of dibaryon (OO) yields at RHIC energies

abstract:
  The yields of dibaryon (Omega-Omega) in relativistic heavy ion collisions,
especially at RHIC energies, are estimated by statistical model. The yields of
hyperon Omega- and the ratio of dibaryon to Omega are also given.


title: A More Flavored Higgs boson in Supersymmetric models

abstract:
  A More flavored Higgs boson arises when the flavor structure encoded in SUSY
extensions of the SM is transmited to the Higgs sector. The flavor-Higgs
transmition mechanism can have a radiative or mixing origin, as it is
illustrated with several examples, and can produce interesting Higgs signatures
that can be probed at future high-energy colliders. Within the MSSM, the flavor
mediation mechanism can be of radiative type, as it is realized trhough
gaugino-slepton loops, which transmit the flavor structture of the
soft-breaking sector to the Higgs bosons. In particular we focus on evaluating
the contributions from the general trilinear terms to the lepton flavor
violating Higgs (LFV) vertices. On the other hand, as an example of flavor
mediation through mixing, we discuss an E_6 inspired multi-Higgs model, with an
abelian flavor symmetry, where LFV as well as lepton flavor conserving Higgs
effects are found to arise, though in this case at tree-level. We find that
Tevatron and LHC can provide information on the flavor structure of these
models through the detection of the LFV higgs mode h-> tau+mu, while NLC can
perform high-precision measurements of the LFC mode h-> tau tau.


title: DGLAP evolution in the saturation model

abstract:
  A modification of the saturation model of deep inelastic scattering at small
x which includes the Altarelli-Parisi (DGLAP) evolution is presented.
Significant improvement of the description of the structure function F_2 at
large Q^2 is achieved and a good description of diffractive data is preserved.


title: Jet analysis by Deterministic Annealing

abstract:
  We perform a comparison of two jet clusterization algorithms. The first one
is the standard Durham algorithm and the second one is a global optimization
scheme, Deterministic Annealing, often used in clusterization problems, and
adapted to the problem of jet identification in particle production by high
energy collisions; in particular we study hadronic jets in WW production by
high energy electron positron scattering. Our results are as follows. First, we
find that the two procedures give basically the same output as far as the
particle clusterization is concerned. Second, we find that the increase of CPU
time with the particle multiplicity is much faster for the Durham jet
clustering algorithm in comparison with Deterministic Annealing. Since this
result follows from the higher computational complexity of the Durham scheme,
it should not depend on the particular process studied here and might be
significant for jet physics at LHC as well.


title: Spectrum of the Multi-Reggeon Compound States in Multi-Colour QCD

abstract:
  We study the properties of the colour-singlet compound states of reggeized
gluons in multi-colour QCD. Applying the methods of integrable models, we
calculate their spectrum and discuss the application of the obtained results to
high-energy asymptotics of the scattering amplitudes in perturbative QCD.


title:
Diffractive vector mesons at large momentum transfer from the BFKL
  equation

abstract:
  Diffractive vector meson photoproduction accompanied by proton dissociation
is studied for large momentum transfer. The process is described by the
non-forward BFKL equation, for which an analytical solution is found for all
conformal spins, giving the scattering amplitude. Results are compared to HERA
data on rho production.


title: The FLUKA atmospheric neutrino flux calculation

abstract:
  The 3-dimensional (3-D) calculation of the atmospheric neutrino flux by means
of the FLUKA Monte Carlo model is here described in all details, starting from
the latest data on primary cosmic ray spectra. The importance of a 3-D
calculation and of its consequences have been already debated in a previous
paper. Here instead the focus is on the absolute flux. We stress the relevant
aspects of the hadronic interaction model of FLUKA in the atmospheric neutrino
flux calculation. This model is constructed and maintained so to provide a high
degree of accuracy in the description of particle production. The accuracy
achieved in the comparison with data from accelerators and cross checked with
data on particle production in atmosphere certifies the reliability of shower
calculation in atmosphere. The results presented here can be already used for
analysis by current experiments on atmospheric neutrinos. However they
represent an intermediate step towards a final release, since this calculation
does not yet include the bending of charged particles in atmosphere. On the
other hand this last aspect, while requiring a considerable effort in a fully
3-D description of the Earth, if a high level of accuracy has to be maintained,
does not affect in a significant way the analysis of atmospheric neutrino
events.


title: Minimal Flavour Violation: an effective field theory approach

abstract:
  We present a general analysis of extensions of the Standard Model which
satisfy the criterion of Minimal Flavour Violation (MFV). We define this
general framework by constructing a low-energy effective theory containing the
Standard Model fields, with one or two Higgs doublets and, as the only source
of SU(3)^5 flavour symmetry breaking, the background values of fields
transforming under the flavour group as the ordinary Yukawa couplings. We
analyse present bounds on the effective scale of dimension-six operators, which
range between 1 and 10 TeV, with the most stringent constraints imposed by B ->
X_s gamma. In this class of theories, it is possible to relate predictions for
FCNC processes in B physics to those in K physics. We compare the sensitivity
of various experimental searches in probing the hypothesis of MFV. Within the
two-Higgs-doublet scenario, we develop a general procedure to obtain all
tan(beta)-enhanced Higgs-mediated FCNC amplitudes, discussing in particular
their impact in B -> l^+l^-, Delta M_B and B -> X_s gamma. As a byproduct, we
derive some two-loop tan(beta)-enhanced supersymmetric contributions to B ->
X_s gamma previously unknown.


title: Explosive black hole fission and fusion in large extra dimensions

abstract:
  Black holes are the densest form of energy, and in the presence of compact
dimensions black objects may take one of several forms including the black-hole
and the black-string, the simplest relevant background being R^{3+1} * S^1.
Recent understanding of the first order nature of the transition indicate a
powerful ``hysteresis'' curve, where black objects may undergo fusion or
fission during a tachyonic decay with Planck power and duration of the order of
the size of the compact dimension L. Such explosions which scale with L could
be test signatures for large extra dimensions in either astronomical
observations or accelerators.


title:
Long distance contributions in $B\toK^*\ell^+\ell^-$ decays with
  polarized $K^*$

abstract:
  We use momentum correlations as physical observables in $B\to
K^{*}l^{+}l^{-}$ decays with $K^{*}$ polarized to study the long distance
contributions. We show that these observables are sensitive to the scenarios of
the long distance parametrizations. We find that the T-odd observable is
directly related to the nonfactorizable effect in the standard model.


title: $\mu$-term as the origin of baryon and lepton number asymmetry

abstract:
  We study a possibility of combining an origin of the $\mu$-term and the
baryon and lepton number asymmetry. If we assume that the $\mu$-term is
generated through a flat direction of a singlet scalar field, the coherent
oscillation of this condensate around its potential minimum can store the
global U(1) charge asymmetry. The decay of this condensate can distribute this
asymmetry into the lepton and baryon number asymmetry as far as its decay
occurs at an appropriate temperature. We examine the compatibility between this
scenario and the small neutrino mass generation based on both the ordinary
seesaw mechanism and the bilinear R-parity violating terms.


title:
Neutrino mixing angles and eigenstates; CP properties and mass
  hierarchies

abstract:
  In the presence of independent generations of leptons, I show that the same
type of ambiguity in the mass spectrum arises as was discussed in ref.[1] for
neutral kaons. It results from the freedom to add to their Majorana mass
matrix, usually taken to be symmetric, an antisymmetric term which vanishes as
soon as fermions belonging to different generations anticommute. In the simple
examples proposed, dealing with two generations, this procedure introduces an
extra (mass) parameter $\rho$, which is shown to connect the (CP violating)
mixing angle to the hierarchy of neutrino masses. We use this opportunity to
investigate the relations between the two; in particular, large hierarchies are
no longer preferentially attached to small mixing angles; this can be relevant
for the ``Large Mixing Angle'' solution strongly advocated by recent
experiments on neutrinos oscillations. I discuss how the $\rho$ parameter could
be fixed, which appears, in the absence of a substructure for leptons, still
more delicate than for kaons.


title: D-term inflation and neutrino mass

abstract:
  We study a $D$-term inflation scenario in a model extended from the minimal
supersymmetric standard model (MSSM) by two additional abelian factor groups
focussing on its particle physics aspects. Condensates of the fields related to
the inflation can naturally give a possible solution to both the $\mu$-problem
in the MSSM and the neutrino mass through their nonrenormalizable couplings to
the MSSM fields. Mixings between neutrinos and neutralinos are also induced by
some of these condensates. Small neutrino masses are generated by a weak scale
seesaw mechanism as a result of these mixings. Moreover, the decay of the
condensates may be able to cause the leptogenesis. Usually known discrepancy
between both values of a Fayet-Iliopoulos $D$-term which are predicted by the
COBE normalization and also by an anomalous U(1) in the weakly-coupled
superstring might be reconciled.


title: Ways to detect a light Higgs boson at the LHC

abstract:
  We summarize the possible processes which may be used to search for a Higgs
boson, of mass in the range 114-130 GeV, at the LHC. We discuss, in detail, two
processes with rapidity gaps: exclusive Higgs production with tagged outgoing
protons and production by Weak Boson Fusion, in each case taking H -> bbbar as
the signal. We make an extensive study of all possible bbbar backgrounds, and
discuss the relevant experimental issues. We emphasize the special features of
these signals, and of their background processes, and show that they could play
an important role in identifying a light Higgs boson at the LHC.


title:
Two-loop amplitudes with nested sums: Fermionic contributions to e+ e-
  --> q qbar g

abstract:
  We present the calculation of the nf-contributions to the two-loop amplitude
for e+ e- --> q qbar g and give results for the full one-loop amplitude to
order eps^2 in the dimensional regularization parameter. Our results agree with
those recently obtained by Garland et al.. The calculation makes extensive use
of an efficient method based on nested sums to calculate two-loop integrals
with arbitrary powers of the propagators. The use of nested sums leads in a
natural way to multiple polylogarithms with simple arguments, which allow a
straightforward analytic continuation.


title: Gauge-fixing dependence of Phi-derivable approximations

abstract:
  We examine the problem of gauge dependence of the 2PI effective action and
its Phi-derivable approximations in gauge theories. The dependence on the
gauge-fixing condition is obtained. The result shows that Phi-derivable
approximations, defined as truncations of the 2PI effective action at a certain
order, have a controlled gauge dependence, i.e. the gauge dependent terms
appear at higher order than the truncation order. Furthermore, using the
stationary point obtained for the approximation to evaluate the complete 2PI
effective action boosts the order at which the gauge dependent terms appear to
twice the order of truncation. We also comment on the significance of this
controlled gauge dependence.


title: Diffractive Hard Dijets and Nuclear Parton Distributions

abstract:
  Diffraction plays an exceptional role in DIS off heavy nuclei. First,
diffraction into hard dijets is an unique probe of the unintegrated glue in the
target. Second, because diffraction makes 50 per cent of total DIS off a heavy
target, understanding diffraction in a saturation regime is crucial for a
definition of saturated nuclear parton densities. After brief comments on the
Nikolaev-Zakharov (NZ) pomeron-splitting mechanism for diffractive hard dijet
production, I review an extension of the Nikolaev-Schafer-Schwiete (NSS)
analysis of diffractive dijet production off nuclei to the definition of
nuclear partons in the saturation regime. I emphasize the importance of
intranuclear final state interactions for the parton momentum distributions.


title: The Lamb Shift and Ultra High Energy Cosmic Rays

abstract:
  On the analogy with the Lamb shift, we study the vacuum effect that proton's
electric field interacts with virtual particles in the vacuum. We find a
possible quantum instability that triggered by an external force, proton's
electric field interacting with virtual particles spontaneously induces a
quantum force that back reacts on the proton in the direction of the external
trigger force. Such a quantum-induced force accelerates the proton runaway, by
gaining the zero-point energy from the vacuum (~10^{-5} eV/cm). This effect
possibly accounts for the mysterious origin and spectrum of ultra high-energy
cosmic ray (UHECR) events above 10^{20}eV, and explains the puzzle why the GZK
cutoff is absent. The candidates of these events could be primary protons from
the early Universe.


title:
Impact Parameter Space Interpretation for Generalized Parton
  Distributions

abstract:
  The Fourier transform of generalized parton distribution functions at xi=0
describes the distribution of partons in the transverse plane. The physical
significance of these impact parameter dependent parton distribution functions
is discussed. In particular, it is shown that they satisfy positivity
constraints which justify their physical interpretation as a probability
density. The generalized parton distribution H is related to the impact
parameter distribution of unpolarized quarks for an unpolarized nucleon,
H-tilde is related to the distribution of longitudinally polarized quarks in a
longitudinally polarized nucleon, and $E$ is related to the distortion of the
unpolarized quark distribution in the transverse plane when the nucleon has
transverse polarization.


title: Production of Protons in Photoproduction at HERA

abstract:
  A measurement of the inclusive cross-section for the photoproduction of
protons in the central fragmentation region at HERA is presented. The measured
cross-section is compared with the prediction of the PYTHIA MC model. The
obtained value of the diquark suppression factor in the Lund string model is
different from that obtained in e+e- data. The dependence of the cross-section
as a function of the transverse mass M_T is shown to be similar for different
hadrons produced in photoproduction at HERA.


title:
Nonpartonic effects in pion electroproduction in the HERMES kinematical
  region

abstract:
  The presentation is concerned with higher twist corrections of nonpartonic
origin to semi-inclusive observables in the kinematical region relevant for the
HERMES experiment. We demonstrate a strong impact of the VDM-like interaction
and the exclusive production of $\rho^0$ meson on the extraction of the $\bar d
- \bar u$ asymmetry from charged pion DIS multiplicities. We also show that it
is the exclusive-$\rho^0$ channel which accounts for the experimentally
observed effect of the excess of charged over neutral pions produced at large
$z$.


title: The CP properties of the lightest Higgs boson with sbottom effects

abstract:
  In the framework of the recently proposed gluino-axion model, using the
effective potential method and taking into account the top-stop as well as the
bottom-sbottom effects, we discuss the CP--properties of the lightest Higgs
boson, in particular its CP--odd composition, which can offer new opportunities
at collider searches. It is found that although the CP-odd composition of the
lightest Higgs increases slightly with the inclusion of the sbottom effects, it
never exceeds %0.17 for all values of the renormalization scale Q ranging from
top mass to TeV scale


title: Slepton Flavour Violation at Colliders

abstract:
  In supersymmetric extensions of the Standard Model, the lepton flavour
violation (LFV) is closely related to the structure of slepton masses and
mixing. Allowing for the most general flavour structure of the slepton sector,
consistent with the experimental limits on rare lepton decays, large and
distinct signals of LFV at future colliders can be expected. A case study of
mixing of second and third generation of sleptons at an e+e- collider is
presented and compared to that of tau to mu+gamma rare decay.


title: Instantons and Saturation in the Colour Dipole Picture

abstract:
  We pursue the intriguing possibility that larger-size instantons build up
diffractive scattering, with the marked instanton-size scale $<\rho> \approx
0.5$ fm being reflected in the conspicuous ``geometrization'' of soft QCD. As
an explicit illustration, the known instanton contribution to DIS is
transformed into the intuitive colour dipole picture. With the help of lattice
results, the $q \bar{q}$-dipole size r is carefully increased towards hadronic
dimensions. Unlike pQCD, one now observes a competition between two crucial
length scales: the dipole size r and the size $\rho$ of the background
instanton that is sharply localized around $<\rho> \approx 0.5$ fm. For r
exceeding $<\rho>$, the dipole cross section indeed saturates towards a
geometrical limit, proportional to the area $\pi <\rho>^2$, subtended by the
instanton.


title: Leptogenesis, mass hierarchies and low energy parameters

abstract:
  Leptogenesis in a left-right symmetric model is investigated for all possible
neutrino mass hierarchies. The predictions of the model for low energy
parameters as measured in neutrinoless double beta decay and in oscillation
experiments are compared. The preferred values of the Majorana phases and
limits on the smallest mass state are given. The main observation is that for
the inverse hierarchy observable CP violation in oscillation experiments as
well as a sizable signal in neutrinoless double beta decay can be expected. In
a degenerate scheme, one Majorana phase is bounded to be around pi/2 or pi, and
this ambiguity can easily be tested through neutrinoless double beta decay. The
dependence of the baryon asymmetry on the different "Dirac" and "Majorana"
phases is analyzed and a possibility to avoid the gravitino problem is
discussed.


title:
One-loop corrections to four-point functions with two external massive
  fermions and two external massless partons

abstract:
  We present a complete set of one-loop matrix elements relevant for the
hadroproduction of heavy quarks in next-to-leading order employing dimensional
regularization to isolate ultraviolet and soft divergences. All results of the
perturbative calculation are given in detail. These one-loop matrix elements
can also be used as input in the determination of the corresponding
next-to-leading order cross sections for heavy flavor photoproduction and in
photon-photon reactions, as well as for any of the relevant crossed processes.
Our results are tested against the results of other related studies in which
unpolarized and longitudinally polarized processes were considered.


title:
The fully differential single-top-quark cross section in next-to-leading
  order QCD

abstract:
  We present a new next-to-leading order calculation for fully differential
single-top-quark final states. The calculation is performed using phase space
slicing and dipole subtraction methods. The results of the methods are found to
be in agreement. The dipole subtraction method calculation retains the full
spin dependence of the final state particles. We show a few numerical results
to illustrate the utility and consistency of the resulting computer
implementations.


title: Branes and Orbifolds are Opaque

abstract:
  We examine localized kinetic terms for gauge fields which can propagate into
compact extra dimensions. We find that such terms are generated by radiative
corrections in both theories with matter fields confined to branes and in
theories imposing orbifold boundary conditions on bulk matter. In both cases,
the radiative corrections are logarithmically divergent, indicating that from
an effective field theory point of view they cannot be predicted in terms of
other parameters, and should be treated as independent leading order parameters
of the theory. Specializing to the five dimensional case, we show that these
terms may result in gross distortions of the Kaluza-Klein gauge field masses,
wave functions, and couplings to brane and bulk matter. The resulting
phenomenological implications are discussed.


title: Uncertainty of the two-loop RG upper bound on the Higgs mass

abstract:
  A modified criterion of the SM perturbative consistency is proposed. It is
based on the analytic properties of the two-loop SM running couplings. Under
the criterion adopted, the Higgs mass up to 380 GeV might not give rise to the
strong coupling prior to the Planck scale. This means that the light Higgs
boson is possibly preferred for reasons other than the SM peturbative
consistency, i.e. for reasons beyond the SM.


title: Saturation and Wilson Line Distributions

abstract:
  We introduce a Wilson line distribution function bar{W}_tau(v) to study gluon
saturation at small Feynman x_F, or large tau=ln(1/x_F). This new distribution
can be obtained from the distribution W_tau(alpha) of the Color Glass
Condensate model and the JIMWLK renormalization group equation. bar{W}_tau(v)
is physically more relevant, and mathematically simpler to deal with because of
unitarity of the Wilson line v. A JIMWLK equation is derived for bar{W}_tau(v);
its properties are studied. These properties are used to complete Mueller's
derivation of the JIMWLK equation, though for bar{W}_tau(v) and not
W_tau(alpha). They are used to derive a generalized Balitsky-Kovchegov equation
for higher multipole amplitudes. They are also used to compute the unintegrated
gluon distribution at x_F=0, yielding a completely flat spectrum in transverse
momentum squared k^2, with a known height. This is similar but not identical to
the mean field result at small k^2.


title: Flavor Symmetries in Extra Dimensions

abstract:
  We present a class of models of flavor that rely on the use of flavor
symmetries and the Froggart-Nielsen mechanism in extra dimensions. The particle
content is that of the standard model plus an additional flavon field; all the
fields propagate in universal extra dimensions and the flavor scale is
associated with the cutoff of the theory, which in 5D is $\sim 10$ TeV. The
Yukawa matrices are generated by higher dimension operators involving flavon
fields, whose vacuum expectation values break the flavor symmetry. We apply
this framework and present a specific 5D model based on a discrete local
symmetry that reproduces all fermion masses and mixing angles both in the quark
and charged lepton sectors.


title:
On the use of the Operator Product Expansion to constrain the hadron
  spectrum

abstract:
  We call into question a recently proposed idea on how the short-distance
behavior of QCD correlation functions constrains hadronic states to become
degenerate parity eigenstates as one goes up in the spectrum. In particular, we
point out that the sum rules which have been proposed in this context are in
general regulator dependent, and thus ill-defined.


title: $B^- \to K^- \chi_{c0}$ decay from charmed meson rescattering

abstract:
  We study the process $B^- \to K^- \chi_{c0}$ considering intermediate charmed
meson rescattering effects. For this decay mode the naive factorization ansatz
would predict a vanishing amplitude. We estimate contributions from the
$D^{(*)}_{s} D^{(*)}\to K^- \chi_{c0}$ rescattering amplitudes, and compare the
result with recent experimental measurements. We find that rescattering effects
are able to produce a large branching ratio consistent with measurements by
Belle Collaboration. We also consider rescattering effects in $B^- \to K^-
J/\psi$, arguing that they play a similar role in producing a large branching
fraction for this colour-suppressed decay mode.


title:
Forward proton tagging as a way to identify a light Higgs boson at the
  LHC

abstract:
  We show that exclusive double-diffractive Higgs production, pp -> p+H+p,
followed by the H -> bbbar decay, could play an important role in identifying a
`light' Higgs boson at the LHC, provided that the forward outgoing protons are
tagged. We predict the cross sections for the signal and for all possible bbbar
backgrounds.


title: Elimination of Ambiguities in pi-pi Amplitudes Using Roy's Equations

abstract:
  Roy's equations are used to check if scalar-isoscalar pi-pi amplitudes fitted
to the ``up-flat'' and ``down-flat'' phase shift solutions fulfill crossing
symmetry below 1 GeV. It is shown that the amplitude fitted to the
``down-flat'' solution satisfies crossing symmetry while the ``up-flat'' one
does not. In such a way the ``up-down'' ambiguity in the scalar-isoscalar phase
shifts is resolved in favour of the ``down-flat'' solution.


title: A New Analysis of the pi+pi- and pi0pi0 Data

abstract:
  A joint analysis of the pi+pi- and pi0pi0 S-wave amplitudes including results
of three experiments has been performed. Using our theoretical model of the
pion-pion production in which not only the pion exchange but also the a1(1260)
meson exchange were taken into account we have obtained a unique solution
(called "down-flat") for the scalar-isoscalar phase shifts. Thus a
long-standing problem of ambiguities in the S-wave isoscalar amplitude has been
finally resolved and the second ("up-flat") solution was eliminated.


title: $\tau$ polarization and Randall-Sundrum scenario at $e^+e^-$ colliders

abstract:
  We study polarized cross-sections and forward-backward asymmetry for the
process $e^+e-\to \tau^+\tau^-$ in the stabilized Randall-Sundrum scenario. It
is shown that there is substantial deviation from the Standard Model
predictions, both in terms of the actual numerical values and angular
distributions.


title:
Nondecoupling Effects of Heavy Higgs Particles in Two Higgs Doublet
  Model

abstract:
  Non-decoupling properties of additional heavy degrees of freedom in the Higgs
sector of the Two-Higgs-doublet extension of the Standard model are discussed
in a particular case of production of a pair of longitudinaly polarized
W-bosons in the e^+e^- annihilation.


title: Update of MRST Parton Distributions

abstract:
  We discuss the latest update of the MRST parton distributions in response to
the most recent data. We discuss the areas where there are hints of
difficulties in the global fit, and compare to some other updated sets of
parton distributions, particularly CTEQ6. We briefly discuss the issue of
uncertainties associated with partons.


title: Moments of the truncated multiplicity distributions

abstract:
  In experiment, the multiplicity distributions of inelastic processes are
truncated due to finite energy, insufficient statistics or special choice of
events. It is shown that the moments of such truncated multiplicity
distributions possess some typical features.In particular, the oscillations of
cumulant moments at high ranks and their negative values at the second rank can
be considered as ones most indicative on specifics of these distributions. They
allow to distinguish between distributions of different type.


title:
Direct extraction of QCD LambdaMSbar from moments of structure functions
  in neutrino-nucleon scattering, using the CORGI approach

abstract:
  We use recently calculated next-to-next-to-leading (NNLO) anomalous dimension
coefficients for the n=1,3,5,...,13 moments of the xF3 structure function in
nuN scattering, together with the corresponding three-loop Wilson coefficients,
to obtain improved QCD predictions for the moments. The Complete
Renormalization Group Improvement (CORGI) approach is used, in which all
dependence on renormalization or factorization scales is avoided by a complete
resummation of ultraviolet logarithms. The Bernstein Polynomial method is used
to compare these QCD predictions to the xF3 data of the CCFR collaboration.
Direct fits for LambdaMSbar(5), with Nf=5 effective quark flavours, over the
range 20<Q^2<125.9 GeV^2 were performed. We obtain LambdaMSbar(5)=202+54/-45
MeV, corresponding to the three-loop running coupling
alphas(MZ)=0.1174+0.0043-0.0043. Including target mass corrections as well we
obtain LambdaMSbar(5)=228+35/-36 MeV, corresponding to
alphas(MZ)=0.1196+0.0027-0.0031.


title:
Supersymmetric penguin contributions to the process
  \protect\protect\protect(B_{d}\longrightarrow \Phi K_{s}\protect \protect
  \protect) in SUSY GUT with right-handed neutrino.}

abstract:
  The (B_{d}\longrightarrow \Phi K_{s}) process is without tree level decay
amplitude . Then the SUSY contributions may be significant . We calculate the
neutralino and gluino penguin contributions to the CP violating phase in (SU(5)
) grand unified theory with right-handed neutrino (SU(5)_{RN}) . We find that
the SUSY contribution may change the phase in (B_{d}\longrightarrow \Phi K_{s}
).


title: Heavy-quark axial charges to non-leading order

abstract:
  We combine Witten's renormalization group with the matching conditions of
Bernreuther and Wetzel to calculate at next-to-leading order the complete
heavy-quark contribution to the neutral-current axial-charge measurable in
neutrino-proton elastic scattering. Our results are manifestly renormalization
group invariant.


title: Azimuthal correlation in DIS

abstract:
  We introduce a new angular correlation in DIS process and study its
differential distribution in the region in which the observable is small. We
perform a perturbative resummation at single logarithmic accuracy and estimate
leading non-perturbative power corrections.


title: Out-of-plane QCD radiation in DIS events with high $P_T$ Jets

abstract:
  We present the QCD analysis of the out-of-event-plane momentum distribution
in DIS events with high $p_t$ jets. The achieved accuracy allows the
measurement of the running coupling and the study of non-perturbative effects,
in particular the test of universality of power corrections in a new
experimental regime.


title:
Reply to Comment on ``Electron Mass Operator in a Strong Magnetic Field
  and Dynamical Chiral Symmetry Breaking''

abstract:
  This is our reply to comment (hep-ph/0206289) on our paper [Phys. Rev. Lett.
89 (2002) 011601].


title:
On heavy Majorana neutrinos as a source of the highest energy cosmic
  rays

abstract:
  Cosmic ray events beyond the Greisen-Zatsepin-Kuzmin cut-off represent a
great challenge for particle physics and cosmology. We show that the physics of
heavy Majorana neutrinos, well defined by their masses, cross sections and
lifetimes, could explain the highest energy cosmic rays as a consequence of the
galactic annihilation of heavy neutrinos as cold dark matter particles.
Galactic nuclei accelerators, colliding neutron stars (black holes) or shocks
from the collapsed objects could produce ultra high energy cosmic rays as heavy
neutrinos beyond the mass threshold at an arbitrary cosmic distance. We comment
and also analyse the DAMA results with regard to heavy neutrinos as galactic
halo CDM particles.


title:
NLO differential distributions of massive lepton-pair production in
  longitudinally polarized proton-proton collisions

abstract:
  We present the full next-to-leading order (NLO) corrected inclusive cross
section $d^3\Delta \sigma/dQ^2/dy/dp_T$ for massive lepton pair production in
longitudinally polarized proton-proton collisions $p + p\to l^+l^- + 'X'$. Here
$'X'$ denotes any inclusive hadronic state and Q represents the invariant mass
of the lepton pair which has transverse momentum p_T and rapidity y. All QCD
partonic subprocesses have been included provided the lepton pair is created by
a virtual photon, which is a valid approximation for $Q<50{\rm GeV}$. Like in
unpolarized proton-proton scattering the dominant subprocess is given by
$q(\bar q) + g \to \gamma^* + 'X'$ so that massive lepton pair production
provides us with an excellent method to measure the spin density of the gluon.
Our calculations are carried out using the method of n-dimensional
regularization by making a special choice for the $\gamma_5$-matrix. Like in
the case of many other prescriptions evanescent counter terms appear. They are
determined by computing the NLO coefficient functions for $d\Delta\sigma/dQ^2$
and the polarized cross section for Higgs production using both n-dimensional
regularization and a four dimensional regularization technique in which the
$\gamma_5$-matrix is uniquely defined. Our calculations reveal that the
non-singlet polarized coefficient function equals the unpolarized one up to a
minus sign. We give predictions for double longitudinal spin asymmetry
measurements at the RHIC.


title: The Handbag Contribution to Two-Photon Annihilation Into Meson Pairs

abstract:
  We report on the handbag contribution to two-photon annihilation into pion
and kaon pairs at large energy and momentum transfer. The underlying physics of
the mechanism is outlined and characteristic features and predictions are
presented.


title: Topology of space at sub-quark level and masses of quarks and leptons

abstract:
  The global shape (topology) of the Universe is not derivable from General
Relativity but should be determined by observations. Here we propose a method
for estimation of this shape using patterns of fundamental physical parameters,
for example the spectrum of fermion masses. We suppose that this pattern might
appear because of specific topology at sub-quark level. We restrict ourselves
to the analysis of a topological object described by F.Klein in 1882 and show
that its properties could give rise to structures reproducing three families of
leptons and quarks.


title: SO(10) and SU(6) Unified Theories on an Elongated Rectangle

abstract:
  Maximally supersymmetric SO(10) and SU(6) unified theories are constructed on
the orbifold T^2/(Z_2 x Z'_2), with one length scale R_5 taken much larger than
the other, R_6. The effective theory below 1/R_6 is found to be the highly
successful SU(5) theory in 5D with natural doublet-triplet splitting, no proton
decay from operators of dimension four or five, unified mass relations for
heavier generations only, and a precise prediction for gauge coupling
unification. A more unified gauge symmetry, and the possibility of Higgs
doublets being components of the higher dimensional gauge multiplet, are
therefore compatible with a large energy interval where physics is described by
SU(5) gauge symmetry in 5D. This leads to the distinctive branching ratios for
proton decay from SU(5) gauge boson exchange, p -> l^+ pi^0, l^+ K^0, \bar{nu}
pi^+, \bar{nu} K^+ (l = e, mu), for well-motivated locations for matter.
Several phenomenological features of the higher unified gauge symmetry are
discussed, including the role of an extra U(1) gauge symmetry, which survives
compactification, in the generation of neutrino masses.


title:
Superbeams plus Neutrino Factory: the golden path to leptonic CP
  violation

abstract:
  Superbeams (SB) and Neutrino Factories (NF) are not alternative facilities
for exploring neutrino oscillation physics, but successive steps. The correct
strategy is to contemplate the combination of their expected physics results.
We show its important potential on the disappearance of fake degenerate
solutions in the simultaneous measurement of $\theta_{13}$ and leptonic CP
violation. Intrinsic, sign($\Delta m_{13}^2$) and $\theta_{23}$ degeneracies
are shown to be extensively eliminated when the results from one NF baseline
and a SB facility are combined. A key point is the different average neutrino
energy and baseline of the facilities. For values of $\theta_{13}$ near its
present limit, the short NF baseline, e.g. L=732 km,becomes, after such a
combination, a very interesting distance. For smaller $\theta_{13}$, an
intermediate NF baseline of $O(3000$km) is still required.


title: Pion dispersion relation at finite density and temperature

abstract:
  We study the behavior of the pion dispersion relation in a pion medium at
finite density and temperature. We introduce a pion chemical potential to
describe the finite pion number density and argue that such description is
valid during the hadronic phase of a relativistic heavy-ion collision between
chemical and thermal freeze-out. We make use of an effective Lagrangian that
explicitly respects chiral symmetry through the enforcement of the chiral Ward
identities. The pion dispersion relation is computed through the computation of
the pion self-energy in a non-perturbative fashion by giving an approximate
solution to the Schwinger-Dyson equation for this self-energy. The dispersion
relation is described in terms of a density and temperature dependent mass and
an index of refraction which is also temperature, density as well as momentum
dependent. The index of refraction is larger than unity for all values of the
momentum for finite $\mu$ and $T$. We conclude by exploring some of the
possible consequences for the propagation of pions through the boundary between
the medium and vacuum.


title: Penguins 2002: Penguins in $K\to\pi\pi$ Decays

abstract:
  This talk contains a short overview of the history of the interplay of the
weak and the strong interaction and CP-violation. It describes the
phenomenology and the basic physics mechanisms involved in the Standard Model
calculations of $K\to\pi\pi$ decays with an emphasis on the evaluation of
Penguin operator matrix-elements.


title:
(Quasi)elastic electron-muon large-angle scattering to a two-loop
  approximation: eikonal type contributions I

abstract:
  Part of eikonal type contributions to $e\mu$ large-angle high-energy
scattering cross section is considered in a quasi-elastic experimental set-up.
Apart from virtual corrections we examine inelastic processes with emission of
one and two soft real photons as well as soft lepton and pion pairs. Virtual
photon contributions are given within a logarithmic accuracy. Box type Feynman
amplitudes with leptonic and hadronic vacuum polarization insertion are
considered explicitly as well as double box ones. Wherever appropriate analytic
expressions obtained are compared with those predicted by a structure function
approach.