title: SU(3) Decay Amplitudes of Pentaquarks into Decuplet Baryons

abstract:
  Evidence for the existence of exotic, pentaquark baryons was first found in
the invariant mass spectrum of a baryon-meson pair, with the baryon in the
octet of flavor SU(3). Exotic pentaquarks may also decay into members of the
spin-3/2 baryon decuplet. We calculate relations between decay rates of the
exotic pentaquark into a baryon decuplet and an octet of pseudoscalar mesons
based on SU(3) flavor symmetry, including the leading flavor symmetry breaking
term. We consider all possible representations for an exotic pentaquark,
namely, that it belongs to either a \bar{10}, 27, or 35 representation of
flavor SU(3). In addition, we use the approximate SU(6) spin-flavor symmetry of
baryons to derive relations between the reduced matrix elements of our
calculation and those of an existing analogous calculation for decays into the
baryon octet. By comparing several decay rates of exotics into both octet and
decuplet baryons, our results could be used to elucidate the SU(3) nature of
pentaquarks.


title: Transport Coefficients in Hot QCD

abstract:
  I give a physical explanation of what shear viscosity is, and what physics
determines its value. Then I explain why determining the shear viscosity of the
Quark-Gluon Plasma is interesting. I outline the leading-order calculation of
the QGP shear viscosity (and baryon number diffusion constant), explaining why
the quite complicated physics of parton splitting and Landau-Pomeranchuk-Migdal
interference effects are required for its calculation. Then I briefly explore
the range of applicability, emphasizing the importance of plasma instabilities.


title: The Particle Physics Reach of High-Energy Neutrino Astronomy

abstract:
  We discuss the prospects for high-energy neutrino astronomy to study particle
physics in the energy regime comparable to and beyond that obtainable at the
current and planned colliders. We describe the various signatures of
high-energy cosmic neutrinos expected in both neutrino telescopes and air
shower experiments and discuss these measurements within the context of
theoretical models with a quantum gravity or string scale near a TeV,
supersymmetry and scenarios with interactions induced by electroweak
instantons. We attempt to access the particle physics reach of these
experiments.


title: Prethermalisation and the Build Up of the Higgs Effect

abstract:
  Real time field excitations in the broken symmetry phase of the classical
abelian Gauge+Higgs model are studied numerically in the unitary gauge, for
systems starting from the unstable maximum of the Higgs potential.


title: K -> 3 Pi Decays in Chiral Perturbation Theory

abstract:
  A kaon decaying into three pions is an example of a weak process. However,
since the quarks are confined into mesons, the strong interaction also plays an
important part. The reaction is a low-energy one, meaning that it takes place
in the non-perturbative region of QCD. In that region perturbative QCD doesn't
give you any answers and other methods have to be used. The one we use is
called Chiral Perturbation Theory.


title: Experimental Tools for SPA

abstract:
  Provided SUSY is realized in Nature, future colliders like the Large Hadron
Collider (LHC) and a future e+e- linear collider (LC) will provide a wealth of
data on SUSY phenomena. One important task will be to extract the Lagrangian
parameters at the electroweak scale from the numerous measured observables and
to extrapolate them to a high scale to check whether unification takes place or
to learn about the SUSY breaking mechanism. To accomplish such a task, two new
programs, SFITTER and Fittino, have recently been developed. This talk
introduces both programs and presents first results obtained with them.


title: Small x QCD

abstract:
  A review of some theoretical aspects of small x QCD physics is given, with a
particular emphasis to the relation between the BFKL and the colour dipole
approaches. The nonlinear evolution equations one may construct, as a better
approximation beyond the linear analysis, are discussed together with their
relation to a possible saturation regime.


title:
Chiral symmetry breaking, color superconductivity and gapless modes in
  2SC+s quark matter

abstract:
  We investigate the chiral symmetry breaking and color superconductivity in
color and electric charge neutral quark matter including strange quarks (2SC+s
quark matter) in a Nambu-Jona-Lasinio model using a variational method. The
methodology involves an explicit construction of a variational ground state and
minimisation of the thermodynamic potential. Simultaneous existence of a mass
gap and a superconducting gap is seen in a small window of quark chemical
potential within the model when charge neutrality conditions are not imposed.
Enforcing color and electric charge neutrality conditions gives rise to the
existence of gapless modes in 2SC+s quark matter depending upon the magnitude
of the gap and the difference of the chemical potentials of the condensing
quarks. Within the window for gapless modes, it is seen that the strange quark
density can be as large as 30%--40% of the number density of either of the
condensing light quarks.


title: Transport Coefficients in Color Superconducting Quark Matter

abstract:
  Transport coefficients of dense quark matter are needed to study properties
of compact stars. They can tell us about the cooling, vibrational and
rotational properties of the star. We report below a computation of the shear
viscosity in the CFL phase at low temperature T. CFL quark matter behaves as a
superfluid, and at low T its transport properties are dominated by the
collisions of superfluid phonons.


title:
Soft gluon radiation and energy dependence of total hadronic
  cross-sections

abstract:
  An impact parameter representation for soft gluon radiation is applied to
obtain both the initial decrease of the total cross-section ($\sigma_{tot}$)
for proton-proton collisions as well as the later rise of $\sigma_{tot}$ with
energy for both $pp$ and $p\bar{p}$. The non-perturbative soft part of the
eikonal includes only limited low energy gluon emission and leads to the
initial decrease in the proton-proton cross- section. On the other hand, the
rapid rise in the hard, perturbative jet part of the eikonal is tamed into the
experimentally observed mild increase by soft gluon radiation whose maximum
energy rises slowly with energy.


title:
Parton intrinsic motion: suppression of the Collins mechanism for
  transverse single spin asymmetries in p(transv. polarised) p --> pion + X

abstract:
  We consider a general formalism to compute inclusive polarised and
unpolarised cross sections within pQCD and the factorisation scheme, taking
into account parton intrinsic motion in distribution and fragmentation
functions, as well as in the elementary dynamics. Surprisingly, the intrinsic
partonic motion, with all the correct azimuthal angular dependences, produces a
strong suppression of the transverse single spin asymmetry arising from the
Collins mechanism. As a consequence, and in contradiction with earlier claims,
the Collins mechanism is unable to explain the large asymmetries found in
p(transv. polarised) p --> pion + X at moderate to large Feynman x_F. The
Sivers effect is not suppressed.


title: Light Dark Matter

abstract:
  We show how light spin-1/2 or spin-0 particles may be acceptable Dark Matter
candidates, provided they annihilate sufficiently strongly through new
interactions, such as those induced by a new light neutral spin-1 boson U. The
corresponding interaction is stronger than weak interactions at lower energies,
but weaker at higher energies.
  Annihilation cross sections of (axially coupled) spin-1/2 Dark Matter
particles, induced by a U vectorially coupled to matter, are the same as for
spin-0 particles. In both cases, the cross sections (sigma v_rel/c) into e+e-
automatically include a v_dm^2 suppression factor, as desirable to avoid an
excessive production of gamma rays from residual Dark Matter annihilations. We
also relate Dark Matter annihilations with production cross sections in e+e-
reactions. As for spin-0, light spin-1/2 Dark Matter particles annihilating
into e+e- could be responsible for the bright 511 keV gamma ray line observed
by INTEGRAL from the galactic bulge.


title: Thermodynamics of Deconfined QCD at Small and Large Chemical Potential

abstract:
  We present large $N_f$ QCD/QED as a test bed for improved pressure
calculations, show how to apply the hints obtained on optimized renormalization
scales at large $N_f$ to finite $N_f=2$, and compare the results to recent
lattice data.


title: Anomalous specific heat in ultradegenerate QED and QCD

abstract:
  We discuss the origin of the anomalous $T\ln T^{-1}$ behavior of the
low-temperature entropy and specific heat in ultradegenerate QED and QCD and
report on a recent calculation which is complete to leading order in the
coupling and which contains an infinite series of anomalous terms involving
also fractional powers in $T$. This result involves dynamical hard-dense-loop
resummation and interpolates between Debye screening effects at larger
temperatures and non-Fermi-liquid behavior from only dynamically screened
magnetic fields at low temperature.


title: Renormalization and resummation in field theories

abstract:
  Using resummation in perturbation theories at finite temperature or in
non-equilibrium is unavoidable to obtain consistent results. Resummation,
however, is often in conflict with renormalization. In this talk we give two
possible solutions to problems of this type in static resummation. One is the
use of auxiliary finite temperature UV divergent counterterms. The other is to
use a renormalization scheme fitted to the environment. We also suggest a way
how one could proceed in case of dynamic resummations.


title: Large Matter Effects in ${{\nu_\mu \to \nu_\tau}}$ Oscillations

abstract:
  We show that matter effects change the ${\rm {\nu_\mu \to \nu_\tau}}$
oscillation probability by as much as 70% for certain ranges of energies and
pathlengths. Consequently, the ${\rm {\nu_\mu \to \nu_\mu}}$ survival
probability also undergoes large changes. A proper understanding of $\nu_\mu$
survival rates must consider matter effects in $P_{\mu \tau}$ as well as
$P_{\mu e}$. We comment on a) how these matter effects may be observed and the
sign of $\Delta_{31}$ determined in atmospheric neutrino measurements and at
neutrino factories and b) how they lead to heightened sensitivity for small
$\theta_{13}$.


title: A vector-like heavy quark in the Littlest Higgs model

abstract:
  The Littlest Higgs model contains a new vector-like heavy quark in the up
sector. There are two interesting features of its existence. One is that it
extends the $3\times3$ CKM matrix in the Standard Model to a $4\times3$ matrix
and the other is that it allows Z-mediated flavor changing neutral currents at
tree level in the up sector but not in the down sector. We examine a few of
possible windows in which the Z-mediated flavor changing neutral currents in
the Littlest Higgs Model can be tested.


title: Computer Simulations of High Energy Physics

abstract:
  This thesis describes the development of two independent computer programs,
Herwig++ and Effective. Both of these programs are used for phenomenological
predictions of high energy physics. Herwig++ is used to simulate events as
measured at particle colliders. This thesis presents a new set of variables for
parton shower evolution. These new variables retain the angular ordering
feature of the variables found in the original HERWIG software, while improving
the Lorentz invariance of the shower and improving the coverage of the phase
space. Also developed is a new model for hadronization. By changing the
distribution of probabilities of cluster decays into hadron pairs this model is
able to enforce desired results, such as isospin symmetry or meson-baryon
ratios, more intuitively. These new developments are compared against existing
LEP data. Effective is used to generate the mass spectrum of supersymmetric
models. This program is able to provide the 1-loop effective potential and
1-loop mass matrices for an arbitrary N=1 supersymmetric model. This software
also is able to solve the renormalization group equations at one-loop for the
parameters of the model and, in turn, provide the scale dependent values of
these parameters.


title: Higgs coupling constants as a probe of new physics

abstract:
  We study new physics effects on the couplings of weak gauge bosons with the
lightest CP-even Higgs boson ($h$), $hZZ$, and the tri-linear coupling of the
lightest Higgs boson, $hhh$, at the one loop order, as predicted by the two
Higgs doublet model. Those renormalized coupling constants can deviate from the
Standard Model (SM) predictions due to two distinct origins; the tree level
mixing effect of Higgs bosons and the quantum effect of additional particles in
loop diagrams. The latter can be enhanced in the renormalized $hhh$ coupling
constant when the additional particles show the non-decoupling property.
Therefore, even in the case where the $hZZ$ coupling is close to the SM value,
deviation in the $hhh$ coupling from the SM value can become as large as plus
100 percent, while that in the $hZZ$ coupling is at most minus 1 percent level.
Such large quantum effect on the Higgs tri-linear coupling is distinguishable
from the tree level mixing effect, and is expected to be detectable at a future
linear collider.


title: Double distributions for the proton

abstract:
  We derive double distributions for the proton in a simple model that contains
scalar as well as axial-vector diquark correlations. The model parameters are
tuned so that the experimentally measured electromagnetic form factors are
reproduced for small momentum transfer. Resulting generalized parton
distributions satisfy known constraints, including the positivity bounds.


title: A New Mechanism For Baryogenesis Living Through Electroweak Era

abstract:
  We present a new mechanism for baryogenesis by introducing a heavy
vector-like SU(2)_W singlet quark(s) with Q_{em}=2/3 quark U or Q_{em}=-1/3
quark D. The lifetime of the heavy quark is assumed to be in the range 2 \times
10^{-11}s < t < 1s. Being SU(2)_W singlet, it survives the electroweak phase
transition era. It mixes with SU(2)_W doublet quarks with tiny mixing angles to
satisfy the FCNC constraints, where a simple Z_2 symmetry is suggested for
realizing this scheme. The heavy quark asymmetry is generated in analogy with
the old GUT scenario.


title: Quark-Gluon Plasma Thermalization and Plasma Instabilities

abstract:
  In this talk, I review the important role played by plasma instabilities in
the thermalization of quark-gluon plasmas at very high energy. [Conference talk
presented at Strong and Electroweak Mattter 2004, Helsinki, Finland, June
16--19.]


title: Probing small-$x$ gluons by low-mass Drell-Yan pairs at colliders

abstract:
  The transverse-momentum ($Q_T$) distribution of low-mass Drell-Yan pairs is
calculated in QCD perturbation theory with all-order resummation of $\alpha_s
(\alpha_s \ln(Q^2_T/Q^2))^n$ type terms. We demonstrate that the rapidity
distribution of low-mass Drell-Yan pairs at large-enough transverse momentum is
an advantageous source of constraints on the gluon distribution and its nuclear
dependence. We argue that low-mass Drell-Yan pairs in the forward region
provide a good and clean probe of small-$x$ gluons at collider energies.


title: The Little Higgs boson at a photon collider

abstract:
  We calculate the partial widths of the light Higgs boson in the Littlest
Higgs model. The loop-induced Higgs coupling to photon pairs, which is
especially sensitive to effects of the new TeV-scale particles running in the
loop, can be probed with high precision at a photon collider in the process
gamma gamma --> H --> b bbar. Using the parameters of the Littlest Higgs model
measured at the LHC one can calculate a prediction for this process, which will
serve as a test of the model and as a probe for a strongly-coupled UV
completion at the 10 TeV scale.


title: Cold Electroweak Baryogenesis

abstract:
  We present arguments that the CKM CP-violation in the standard model may be
sufficient for the generation of the baryon asymmetry, if the electroweak
transition in the early universe was of the cold, tachyonic, type after
electroweak-scale inflation. A model implementing this is described which
complies with the CMB constraints and which is falsifiable with the LHC.
Numerical simulations of the tachyonic transition with an effective CP-bias
indicate that the observed baryon asymmetry can be generated this way.


title: Photoproduction and Radiative Decay of Spin 1/2 and 3/2 Pentaquarks

abstract:
  We study photoproduction and radiative decays of pentauqarks paying
particular attention to the differences between spin-1/2 and spin-3/2, positive
and negative parities of pentaquarks. Detailed study of these processes can not
only give crucial information about the spin, but also the parity of
pentaquarks.


title:
Two-Loop Helicity Amplitudes for Quark-Quark Scattering in QCD and
  Gluino-Gluino Scattering in Supersymmetric Yang-Mills Theory

abstract:
  We present the two-loop QCD helicity amplitudes for quark-quark and
quark-antiquark scattering. These amplitudes are relevant for
next-to-next-to-leading order corrections to (polarized) jet production at
hadron colliders. We give the results in the `t Hooft-Veltman and
four-dimensional helicity (FDH) variants of dimensional regularization and
present the scheme dependence of the results. We verify that the finite
remainder, after subtracting the divergences using Catani's formula, are in
agreement with previous results. We also provide the amplitudes for
gluino-gluino scattering in pure N=1 supersymmetric Yang-Mills theory. We
describe ambiguities in continuing the Dirac algebra to D dimensions, including
ones which violate fermion helicity conservation. The finite remainders after
subtracting the divergences using Catani's formula, which enter into physical
quantities, are free of these ambiguities. We show that in the FDH scheme, for
gluino-gluino scattering, the finite remainders satisfy the expected
supersymmetry Ward identities.


title: Higgs Theory--A Brief Overview

abstract:
  A brief overview is given of the theory of Higgs bosons and electroweak
symmetry breaking that is relevant for the Higgs physics program at the Linear
Collider.


title: Neutral Higgs Boson Production and CP Violation at LC

abstract:
  We study the neutral Higgs boson production at the $e^- e^+$ linear collider
in the two Higgs doublet model with the CP violation. The CP-even and CP-odd
scalars are mixed in this model, which affects the production process of
neutral Higgs boson.


title: Supersymmetric Higgs production in gluon fusion at next-to-leading order

abstract:
  The next-to-leading order (NLO) QCD corrections to the production and decay
rate of a Higgs boson are computed within the framework of the Minimal
Supersymmetric Standard Model (MSSM). The calculation is based on an effective
theory for light and intermediate mass Higgs bosons. We provide a Fortran
routine for the numerical evaluation of the coefficient function. For most of
the MSSM parameter space, the relative size of the NLO corrections is typically
of the order of 5% smaller than the Standard Model value. We exemplify the
numerical results for two scenarios: the benchmark point SPS1a, and a parameter
region where the gluon-Higgs coupling at leading order is very small due to a
cancellation of the squark and quark contributions.


title: Automated use of DIANA for two-fermion production at colliders

abstract:
  We describe packages for the calculation of radiative corrections to
two-fermion production at colliders. The packages use DIANA, and also QGRAF,
FORM, Fortran, and further unix/linux tools. The one-loop calculations in the
Standard Model are highly automatized with the package aITALC. Further, the
automatic determination of all the matrix elements for two-loop corrections to
massive Bhabha scattering in QED and the classification of their topologies and
prototypes is done with DIANA. A generalization to the Standard Model is
straightforward.


title:
Collins Effect in Single Spin Asymmetries of the $p^{\uparrow}p \to \pi
  X$ Process

abstract:
  We investigate the Collins effect in single spin asymmetries (SSAs) of the
$p^{\uparrow}p \to \pi X$ process, by taking into account the transverse
momentum dependence of the microscopic sub-processes cross sections, with the
transverse momentum in the Collins function integrated over. We find that the
asymmetries due to the Collins effect can only explain the available data at
best qualitatively, by using our choices of quark distributions in the
quark-diquark model and a pQCD-based analysis, together with several options of
the Collins function. Our results indicate the necessity to take into account
contributions from other effects such as the Sivers effect or twist-3
contributions.


title: Pion Interferometry for a Granular Source of Quark-Gluon Plasma Droplets

abstract:
  We examine the two-pion interferometry for a granular source of quark-gluon
plasma droplets. The evolution of the droplets is described by relativistic
hydrodynamics with an equation of state suggested by lattice gauge results.
Pions are assumed to be emitted thermally from the droplets at the freeze-out
configuration characterized by a freeze-out temperature $T_f$. We find that the
HBT radius $R_{out}$ decreases if the initial size of the droplets decreases.
On the other hand, $R_{side}$ depends on the droplet spatial distribution and
is relatively independent of the droplet size. It increases with an increase in
the width of the spatial distribution and the collective-expansion velocity of
the droplets. As a result, the value of $R_{out}$ can lie close to $R_{side}$
for a granular quark-gluon plasma source. The granular model of the emitting
source may provide an explanation to the RHIC HBT puzzle and may lead to a new
insight into the dynamics of the quark-gluon plasma phase transition.


title: Role of transverse polarization in constraining new physics

abstract:
  Transverse polarization (TP) can be used to study interference of (S,P) or T
type couplings from new physics with the SM contribution. In e+e- -> t tbar, a
CP-odd azimuthal asymmetry can constrain the scale Lambda of new (S,P) or T
contact interactions to be higher than about 7 TeV for total c.m. energy of 500
GeV, integrated luminosity of 500 inverse fb, and assuming 80% e- and 60% e+
polarizations in opposite directions. In e+e- -> gamma Z without chirality
violation, but with CP-violating anomalous gamma-gamma-Z couplings, an
azimuthal asymmetry can probe the anomalous coupling down to about 10^{-2}.


title: Pentaquarks in the Chiral Symmetry Limit

abstract:
  We demonstrate that a five quark state of positive parity with an internal
P-wave structure - usually pictured as a composite of an antiquark and two
diquarks in a P-wave state - can couple to nucleons and Goldstone particles in
a chirally invariant way. The corresponding decay width is generally not
suppressed. A pentaquark of positive or negative parity with an internal S-wave
structure, which may be viewed as a composite of an antiquark and two chirally
different diquarks in an S-state, does not couple to nucleons and light mesons
in the limit of an unbroken chiral symmetry. It is stable in this limit.
However, such states can decay via the effect of the spontaneous breaking of
chiral symmetry. This breaking is strong because of the sizeable magnitude of
the quark condensate. Thus, chiral symmetry cannot be the cause of a tiny decay
amplitude, even for pentaquarks stable in a strict chiral symmetry limit.


title: Heavy Quarks at Threshold: Recent Developments

abstract:
  Recent developments in the treatment of a system of heavy quarks close to
their production threshold are discussed. Particular emphasis is put on the
next-to-next-to-next-to-leading order (N$^3$LO) corrections to the energy
levels and the wave function and their effect on the cross section
$\sigma(e^+e^-\to t\bar{t})$. Furthermore, the resummation of logarithmic
corrections within the framework of potential non-relativistic QCD (pNRQCD) are
considered.


title: On master integrals for two loop Bhabha scattering

abstract:
  All scalar master integrals (MIs) for massive 2-loop QED Bhabha scattering
are identified. The 2- and 3-point MIs have been calculated in terms of
harmonic polylogarithms with the differential equation method. The calculation
of 4-point MIs is underway. We sketch some alternative methods which help to
solve (mainly) singularities of some MIs.


title: Generation-changing interaction of sneutrinos in $e^+e^-$ collisions

abstract:
  Measurability of generation mixing is studied on the pair production of
sneutrinos in $e^+e^-$ collisions and their subsequent decays into two
different charged leptons $e$ and $\mu$ with two lighter charginos. The
analyses are made systematically in a general framework of the supersymmetric
extension of the standard model. The production and decay process depends on
the parameters of the chargino sector, as well as those of the sneutrino
sector. Although generation-changing interactions are severely constrained by
radiative charged-lepton decays, sizable regions in the parameter space could
still be explored at $e^+e^-$ colliders in near future.


title: Minimal supersymmetric SO(10) GUT with doublet Higgs

abstract:
  We propose a simple supersymmetric SO(10) GUT model with only doublet Higgs
scalars. The fermion mass problem is naturally solved by a new one-loop
diagram. R-parity is conserved implying a stable LSP which can explain the dark
matter of the universe. There are two contributions to the neutrino masses, one
of which depends on the quark mass squared while the other is independent and
similar to the type II see-saw mechanism. In the latter case $b-\tau$
unification implies large neutrino mixing angles. The baryon asymmetry of the
universe is explained through leptogenesis.


title: Resonant Higgs-Sector CP Violation at the LHC

abstract:
  We present the general formalism for studying CP-violating phenomena in the
production,mixing and decay of a coupled system of CP-violating neutral Higgs
bosons at high-energy colliders. Considering the Minimal Supersymmetric
Standard Model (MSSM) Higgs sector in which CP violation is radiatively induced
by phases of the soft supersymmetry-breaking parameters, we apply our formalism
to neutral Higgs production via {\bar b}b, gg and W^+ W^- collisions and their
subsequent decays into tau^+ tau^- pairs at the LHC. We discuss CP asymmetries
in the longitudinal polarizations of tau^+ tau^- pairs based on a scenario in
which all neutral Higgs bosons are nearly degenerate and the CP-violating
signatures are resonantly enhanced.


title:
Factorization of the Q^2 dependence in electroproduction of vector
  mesons

abstract:
  In a framework for nonperturbative QCD calculation of high energy processes,
the amplitudes for photo- and electroproduction of vector mesons are written as
integrals of the overlap product of photon and vector meson wave functions,
multiplied by the amplitude for the scattering of $q\bar{q}$ dipole pairs off
the proton. For sizes of the overlap functions that are smaller than the
typical ranges of the interaction of the dipoles with the proton, the
amplitudes factorize in the form of integrals, here called overlap strengths,
formed only with the overlap of the wave functions times the square of the
dipole separation. The integration is extended over the light front coordinates
describing the $q\bar{q}$ dipoles. With this result, the overlap strengths
contain all $Q^2$ dependence of the observables. We show the importance of this
factorization in the description of the experimental data for all S-wave vector
mesons.


title: Mass spectrum of pentaquarks

abstract:
  We discuss the properties of the pentaquark in a collective stringlike model
with a nonplanar configuration of the four quarks and the antiquark. In an
application to the mass spectrum of exotic Theta baryons, we find that the
ground state pentaquark has angular momentum and parity J(p)=1/2(-) and a small
magnetic moment of 0.382 nuclear magnetons. The decay width is suppressed by
the spatial overlap with the decay products.


title: A QCD dipole formalism for forward-gluon production

abstract:
  We derive inclusive and diffractive forward-gluon production in the
scattering of a $q\bar{q}$ dipole off an arbitrary target in the high-energy
eikonal approximation, suitable to study the saturation regime. We show how the
inclusive cross-section is related to the total cross-section for the
scattering of a colorless pair of gluons on the target: the gluon-production
cross-section can be expressed as a convolution between this $gg$ dipole total
cross-section and a dipole distribution. We then consider as an application the
forward-jet production from an incident hadron and describe forward-jet
production at HERA and Mueller-Navelet jets at Tevatron or LHC. We show how
these measurements are related to the $q\bar{q}-gg$ or $gg-gg$ dipole-dipole
cross-sections and why they are therefore well-suited for studying high-energy
scattering in QCD.


title: Universal Extra Dimensions and Kaluza-Klein Bound States

abstract:
  We study the bounds states of the Kaluza-Klein (KK) excitations of quarks in
models of Universal Extra Dimensions. Such bound states may be detected at
future lepton colliders in the cross section for the pair-production of
KK-quarks near threshold. For typical values of model parameters, we find the
``KK-quarkonia'' have widths in the 10-100 MeV range, and production cross
sections of order a few picobarns for the lightest resonances. Two body decays
of the constituent KK-quarks lead to distinctive experimental signatures.


title: T Parity and the Littlest Higgs

abstract:
  We construct T-parity invariant extensions of the littlest Higgs model, in
which only linear representations of the full symmetry group are employed,
without recourse to the non-linear representations introduced by Coleman,
Callan, Wess, and Zumino (CCWZ). These models are based on the symmetry
breaking pattern SU(5)_l x H_r / SO(5), where H_r can be SO(5) or other larger
symmetry groups. The structure of the models in the SU(5)_l sector is identical
to the littlest Higgs model based on SU(5)/SO(5). Since the full symmetry group
is realized linearly, these models can be thought of as possible UV extensions
of the T-invariant model using non-linear representations via CCWZ, with whom
they share similar low energy phenomenology. We also comment on how to avoid
constraints from four-fermion operators on T-invariant models with or without
CCWZ construction. The electroweak data therefore place a very weak bound on
the symmetry breaking scale, f > 450 GeV.


title: Extracting Higgs Boson Couplings from LHC Data

abstract:
  We show how LHC Higgs boson production and decay data can be used to extract
the gauge and fermion couplings of the Higgs boson. Incomplete input data leads
to parameter degeneracies, which can be lifted by imposing theoretical
assumptions. We show how successive theoretical assumptions affect the
parameter extraction, starting with a general multi-Higgs doublet model and
finishing with specific supersymmetric scenarios.


title: Describing relativistic fermions with two-component field

abstract:
  With a non-unitary transformation, the Lagrangian of a Dirac fermion is
decomposed into two decoupled sectors. We propose to describe massive
relativistic fermions in gauge theories in a two-component form. All relations
between the Green's functions in this form and those in the conventional
four-component form are derived. It is shown that the S-matrix elements in both
forms are exactly the same. The description of the fermion in the new form
simplifies significantly the gamma-matrix algebra in the four-component form.
In particular, in perturbative calculations the propagator of the fermion is a
scalar function. The advantages of the two-component form make it very useful
in practical applications.


title: Collider Phenomenology for a few models of extra dimensions

abstract:
  In this talk, we summarize the collider phenomenology and recent experimental
results for various models of extra dimensions, including the large extra
dimensions (ADD model), warped extra dimensions (Randall-Sundrum model),
TeV$^{-1}$-sized extra dimensions with gauge bosons in the bulk, universal
extra dimensions, and an 5D SU(5) SUSY GUT model in AdS space.


title: trans-GZK Cosmic Rays: Strings, Black Holes, Neutrinos, or All Three?

abstract:
  We review the scenario in which ``strongly interacting neutrinos'' are
responsible for inducing airshowers with inferred energies $E > 8\times10^{19}$
eV. This possibility arises naturally in string excitation models having a
unification scale effectively decoupled from the Planck scale. We then show
that phenomenological quantum gravity considerations reveal an equivalency of
``mini-black hole'' and strongly interacting neutrino pictures for explaining
trans-GZK events. This equivalence can be exploited to predict single particle
inclusive distributions. The resulting observable consequences in airshower
development are studied using the Adaptive Longitudinal Profile Shower (ALPS)
simulation.


title: Charge correlations in heavy ion collisions

abstract:
  When hot quark gluon plasma expands and cools down after an heavy ion
collision, charge conservation leads to non-trivial correlations between the
charge densities at different rapidities. If these correlations can be
measured, they will provide information about dynamical properties of quark
gluon plasma.


title: Non-leptonic B-decays, CP violation & the UT

abstract:
  We study the implication of the time-dependent CP asymmetry in
$B\to\pi^+\pi^-$ decays on the extraction of weak phases taking into account
the precise measurement of $\sin 2\beta$, obtained from the ``gold-plated''mode
$B\to J/\psi K_S$. Predictions and uncertainties for the hadronic parameters
are investigated in QCD factorization. Furthermore, independent theoretical and
experimental tests of the factorization framework are briefly discussed.
Finally, a model-independent bound on the unitarity triangle from CP violation
in $B\to\pi^+\pi^-$ and $B\to J/\psi K_S$ is derived.


title:
Lepton flavor violating $Z\to l_1^+ l_2^-$ decay in the general two
  Higgs Doublet model with the inclusion of non-universal extra dimensions

abstract:
  We predict the branching ratios of Z -> e^{\pm} \mu^{\pm}, Z -> e^{\pm}
\tau^{\pm} and Z -> \mu^{\pm} \tau^{\pm} decays in the model III version of the
two Higgs doublet model, with the inclusion of one and two spatial
non-universal extra dimensions. We observe that the the branching ratios are
not sensitive to a single extra dimension, however, this sensitivity is
considerably large for two extra dimensions.


title: Lagrange mesh, relativistic flux tube, and rotating string

abstract:
  The Lagrange mesh method is a very accurate and simple procedure to compute
eigenvalues and eigenfunctions of nonrelativistic and semirelativistic
Hamiltonians. We show here that it can be used successfully to solve the
equations of both the relativistic flux tube model and the rotating string
model, in the symmetric case. Verifications of the convergence of the method
are given.


title: Automatized calculation of 2-fermion production with DIANA and aITALC

abstract:
  The family of two fermion final states is among the cleanest final states at
the International Linear Collider (ILC) project. The package aITALC has been
developed for a calculation of their production cross sections, and we present
here benchmark numerical results in one loop approximation in the electroweak
Standard Model. We are using packages like QGRAF, DIANA, FORM, LOOPTOOLS for
intermediate steps.


title: Flavor-Changing Processes in Extended Technicolor

abstract:
  We analyze constraints on a class of extended technicolor (ETC) models from
neutral flavor-changing processes induced by (dimension-six) four-fermion
operators. The ETC gauge group is taken to commute with the standard-model
gauge group. The models in the class are distinguished by how the left- and
right-handed $(L,R)$ components of the quarks and charged leptons transform
under the ETC group. We consider $K^{0} - \bar K^0$ and other pseudoscalar
meson mixings, and conclude that they are adequately suppressed if the $L$ and
$R$ components of the relevant quarks are assigned to the same (fundamental or
conjugate-fundamental) representation of the ETC group. Models in which the $L$
and $R$ components of the down-type quarks are assigned to relatively conjugate
representations, while they can lead to realistic CKM mixing and intra-family
mass splittings, do not adequately suppress these mixing processes. We identify
an approximate global symmetry that elucidates these behavioral differences and
can be used to analyze other possible representation assignments.
Flavor-changing decays, involving quarks and/or leptons, are adequately
suppressed for any ETC-representation assignment of the $L$ and $R$ components
of the quarks, as well as the leptons. We draw lessons for future ETC model
building.


title: Two-loop helicity amplitudes for fermion-fermion scattering

abstract:
  We discuss the calculation of two-loop helicity amplitudes for quark-quark
scattering in QCD and four-gluino scattering in N=1 supersymmetric Yang-Mills
theory. We study the dependence of the results on different variants of
dimensional regularization. In particular, we consider the 't Hooft-Veltman and
four-dimensional helicity (FDH) schemes. We also discuss ambiguities in
continuing the Dirac algebra to D dimensions. For the four-gluino case, once
the infrared divergent part of the amplitude is subtracted, the finite
remainder is free of these ambiguities.


title: Diffractive gamma-gamma production at hadron colliders

abstract:
  We compute the cross section for exclusive double-diffractive gamma-gamma
production at the Tevatron, $p{\bar p} \to p + \gamma\gamma + {\bar p}$, and
the LHC. We evaluate both the gluon-gluon and quark-antiquark t-channel
exchange contributions to the process. The observation of exclusive gamma-gamma
production at the Tevatron will provide a check on the model predictions, and
offer an opportunity to confirm the expectations for exclusive
double-diffractive Higgs production at the LHC.


title: Effect of inhomogeneities on the expansion rate of the Universe

abstract:
  While the expansion rate of a homogeneous isotropic Universe is simply
proportional to the square-root of the energy density, the expansion rate of an
inhomogeneous Universe also depends on the nature of the density
inhomogeneities. In this paper we calculate to second order in perturbation
variables the expansion rate of an inhomogeneous Universe and demonstrate
corrections to the evolution of the expansion rate. While we find that the mean
correction is small, the variance of the correction on the scale of the Hubble
radius is sensitive to the physical significance of the unknown spectrum of
density perturbations beyond the Hubble radius.


title: B-Meson Properties from Modified Sum Rule Analyses

abstract:
  We introduce two approaches to analyses of Borel sum rules. In the first
method, we take the Borel mass M2 to infinity. Here, the sum rules become very
sensitive to the chosen threshold s0. We fix the threshold by setting the
daughter sum rule equal to the meson mass in this limit. The second method
introduces a Borel mass dependent threshold s0(M2). We choose functions s0(M2)
such that the corresponding sum rule is not dependent on the Borel mass
anymore. The relevant hadronic parameter is extracted at the most stable
function s0(M2). The two methods differ in the notion of quark-hadron duality.
Whereas the first method emphasizes errors coming from the simple duality
ansatz, the second method is constructed such as to extract hadronic properties
from the region where the duality approximation is fulfilled best. We use these
modifications of the sum rule approach to extract values for the B-meson decay
constant, the semi-leptonic form factor f+ at zero momentum transfer and the
strong coupling g(BB*Pi). The results coincide with other sum rule analyses.


title:
Next-to-Leading Order Corrections to Single Top Quark Production and
  Decay at the Tevatron: 1. s-channel Process

abstract:
  We present a study of s-channel single top quark production at the upgraded
Tevatron $p\bar{p}$ collider, including the next-to-leading order (NLO) QCD
corrections to the production and the decay of the top quark. The "modified"
narrow width approximation was adopted to preserve the spin of the top quark in
its production and decay. We discuss the effect of the different $O(\alpha_s)$
contributions on the inclusive cross section as well as various kinematic
distributions after imposing the relevant cuts to select s-channel single top
signal events. In particular the $O(\alpha_s)$ decay contribution, while small
in size, has a significant impact on several distributions. With the help of
the best-jet algorithm to reconstruct the top quark we demonstrate that it is
possible to study kinematical and spin correlations in s-channel single top
events. We furthermore compare top quark spin measurements in two different
basis and show how NLO corrections have to be taken into consideration in
searches for the Higgs boson through $W^{\pm}H$ associated production at the
Tevatron.


title:
Comparison of Exact Results for the Virtual Corrections to
  Bremsstrahlung in Electron-Positron Annihilation at High Energies

abstract:
  We have compared the virtual corrections to electron-positron annihilation to
fermion pairs with single hard bremsstrahlung as calculated by S. Jadach, M.
Melles, B.F.L. Ward and S.A. Yost to several other expressions. The most recent
of these comparisons is to the leptonic tensor calculated by J.H. Kuhn and G.
Rodrigo for radiative return. Agreement is found to within $10^{-5}$ or better,
as a fraction of the Born cross section.


title: Little or No Higgs

abstract:
  Both Little Higgs and Higgsless Models provide new windows into the mysteries
of electroweak symmetry breaking and lead to testable predictions at present
and future colliders. Here we give a quick overview of three papers submitted
to the ICHEP2004 meeting on these subjects.


title:
Neutrinos in Anomaly Mediated Supersymmetry Breaking with R-Parity
  Violation

abstract:
  We show that a supersymmetric standard model exhibiting anomaly mediated
supersymmetry breaking can generate naturally the observed neutrino mass
spectrum as well mixings when we include bilinear R-parity violation
interactions. In this model, one of the neutrinos gets its mass due to the tree
level mixing with the neutralinos induced by the R-parity violating
interactions while the other two neutrinos acquire their masses due to
radiative corrections. One interesting feature of this scenario is that the
lightest supersymmetric particle is unstable and its decay can be observed at
high energy colliders, providing a falsifiable test of the model.


title: The Bounds on Lorentz and CPT Violating Parameters in the Higgs Sector

abstract:
  In this talk, I discuss possible bounds on the Lorentz and CPT violating
parameters in the Higgs sector of the so called minimal standard model
extension. The main motivation to this study is coming from the fact that
unlike the parameters in the fermion and gauge sector, there are no published
bounds on the parameters in the Higgs sector. From the one-loop contributions
to the photon propagator the bounds on the CPT-even asymmetric coefficients are
obtained and the c_\mu\nu coefficients in the fermion sector determine the
bound on the CPT-even symmetric coefficients. The CPT-odd coefficient is
bounded from the non-zero vacuum expectation value of the Z-boson.


title: Factorization for Power Corrections to B->Xs gamma and B-> Xu e nu

abstract:
  We derive factorization theorems for Lambda_QCD/mb power corrections to
inclusive B-decays in the endpoint region, where mX^2 ~mb Lambda_QCD. In B-> Xu
e nu our results are for the full triply differential rate. A complete
enumeration of Lambda_QCD/mb corrections is given. We point out the presence of
new Lambda_QCD/mb-suppressed shape functions, which arise at tree level with a
$4 pi$-enhanced coefficient, and show that these previously neglected terms
induce an additional large uncertainty for current inclusive methods of
measuring |Vub| that depend on the endpoint region of phase space.


title:
Shower Power: Isolating the Prompt Atmospheric Neutrino Flux Using
  Electron Neutrinos

abstract:
  At high energies, the very steep decrease of the conventional atmospheric
component of the neutrino spectrum should allow the emergence of even small and
isotropic components of the total spectrum, indicative of new physics, provided
that they are less steeply decreasing, as generically expected. One candidate
is the prompt atmospheric neutrino flux, a probe of cosmic ray composition in
the region of the knee as well as small-$x$ QCD, below the reach of collider
experiments. A second is the diffuse extragalactic background due to distant
and unresolved AGNs and GRBs, a key test of the nature of the highest-energy
sources in the universe. Separating these new physics components from the
conventional atmospheric neutrino flux, as well as from each other, will be
very challenging. We show that the charged-current {\it electron} neutrino
"shower" channel should be particularly effective for isolating the prompt
atmospheric neutrino flux, and that it is more generally an important
complement to the usually-considered charged-current {\it muon} neutrino
"track" channel. These conclusions remain true even for the low prompt
atmospheric neutrino flux predicted in a realistic cosmic ray scenario with
heavy and varying composition across the knee (Candia and Roulet, 2003 JCAP
{\bf 0309}, 005). We also improve the corresponding calculation of the neutrino
flux induced by cosmic ray collisions with the interstellar medium.


title: Neutral top-pion and the rare top decays $t\to c l_{i} l_{j}$

abstract:
  We study the rare top decays $t\to c l_{i} l_{j}(l=\tau,\mu,or e)$ in the
framework of topcolor-assisted technicolor($TC2$) models. We find that the
neutral top-pion $\pi_{t}^{0}$ can produce significant contributions to these
processes via the flavor changing couplings $\pi_{t}^{0} \bar{t} c$ and
$\pi_{t}^{0} l_{i} l_{j}$. For the $\pi_{t}^{0}$ mass $m_{\pi_{t}}=150 GeV$ and
the parameter $\epsilon=0.08$, the branching ratio $Br$(t$\to c \tau \tau)$ can
reach $7.1\times10^{-7}$. Taking into account the constraints of the present
experimental limit of the process $\mu\to e \gamma$ on the free parameters of
$TC2$ models, we find that the value of $Br$($t\to c \tau
\mu$)$\approx$$Br$($t\to c \tau e$) is in the range of
1.8$\times10^{-10}\sim1.7\times10^{-8}$.


title:
Two-loop self-energy correction to the ground-state Lamb shift in H-like
  ions

abstract:
  The two-loop self-energy correction is evaluated to all orders in Z alpha for
the ground-state Lamb shift of H-like ions with Z >= 20, where Z is the nuclear
charge number and alpha is the fine structure constant. The results obtained
are compared with analytical calculations performed within the Z alpha
expansion.


title: Six-fermions (and more) studies

abstract:
  We review the available event generators suited for multi-fermion final state
production in the context of physics studies at a future Linear Collider (LC)


title: Probing the Majorana Nature and CP Properties of Neutralinos

abstract:
  Two powerful and straightforward methods are presented for probing the
Majorana nature and CP violation of neutralinos at future $e^+e^-$ linear
colliders.


title: Electron-Positron Annihilation into Hadron-Antihadron Pairs

abstract:
  The reactions of electron-positron to nucleon-antinucleon pairs are studied
in a non-perturbative quark model. The work suggests that the two-step process,
in which the primary quark-antiquark pair forms first a vector meson which in
turn decays into a hadron pair, is dominant over the one-step process in which
the primary quark-antiquark pair is directly dressed by additional
quark-antiquark pairs to form a hadron pair. To reproduce the experimental data
of the reactions of electron-positron to proton-antiproton and
electron-positron to neutron-antineutron a D-wave omega-like vector meson with
a mass of around 2 GeV has to be introduced.


title: The Rarita--Schwinger field: dressing procedure and spin-parity content

abstract:
  We obtain in analytical form the dressed propagator of the massive
Rarita-Schwinger field taking into account all spin components. We found that
the nearest analogy for dressing the Rarita--Schwinger field in spin--1/2
sector is dressing the two Dirac fermions of opposite parity with presence of
mutual transitions. The calculation of the self-energy contributions confirms
that besides the leading spin--3/2 component the Rarita--Schwinger field
contains also two spin--1/2 components of different parity.


title: Electron Spectra in the Ionization of Atoms by Neutrinos

abstract:
  For neutrinos of O(10keV) energies, their oscillation lengths are less than a
few hundred meters, thereby suggesting the fascinating idea of oscillation
experiments of small geometrical size. To help evaluating this idea we
calculate the ionization cross sections of H, He, Ne and Xe, using any neutrino
flavor, in the few keV energy range. We find that the atomic ionization cross
sections per electron are always smaller than the neutrino cross sections off
free electrons, approaching it from below as the energy increases to the 100
keV region. At the 10-20 keV range though, atomic binding effects are very
important, particularly for the heavier atoms, inducing a factor of two
reduction of the Xe ionization cross section, compared to the free electron
one.


title: Collective Quantisation of a Gravitating Skyrmion

abstract:
  Collective quantisation of a B=1 gravitating skyrmion is described. The
rotational and isorotational modes are quantised in the same manner as the
skyrmion without gravity. It is shown in this paper how the static properties
of nucleons such as masses, charge densities, magnetic moments are modified by
the gravitational interaction.


title: Quantization of the chiral soliton in medium

abstract:
  Chiral solitons coupled with quarks in medium are studied based on the
Wigner-Seitz approximation. The chiral quark soliton model is used to obtain
the classical soliton solutions. To investigate nucleon and $\Delta$ in matter,
the semi-classical quantization is performed by the cranking method. The
saturation for nucleon matter and $\Delta$ matter are observed.


title: Singlet GB contributions in the chiral constituent quark model

abstract:
  The implications of the latest data pertaining to \bar u-\bar d asymmetry and
the spin polarization functions on the contributions of singlet Goldstone boson
\eta' within \chiCQM with configuration mixing for explaining the ``proton spin
problem'' have been investigated. It is found that the present data favors
smaller values of the coupling of singlet Goldstone Boson \eta' as compared to
the corresponding contributions from \pi, K and \eta Goldstone bosons. It seems
that a small non-zero value of the coupling of \eta' (\zeta \neq 0) is
preferred over \zeta=0 phenomenologically.


title:
Relations Between NC and CC Neutrino Structure Functions for Nucleons
  and Nuclei

abstract:
  The relations between neutrino NC and CC structure functions and cross
sections, which are driven by isospin symmetry, are discussed for nucleons and
nuclei.


title:
Quark-antiquark production from classical fields in heavy ion
  collisions: 1+1 dimensions

abstract:
  Classical color fields produced by the small-x wave functions of colliding
ultrarelativistic nuclei have been numerically computed. We set up the
framework for computing the production of small-mass quark-antiquark pairs in
these color fields by numerically integrating the Dirac equation. This
computation is essential for understanding the conversion of the initial
gluonic state to chemically equilibrated quark-gluon plasma. To illustrate and
overcome technical difficulties associated with the longitudinal dimension, we
first consider numerically the case of one time + one longitudinal space
dimension.


title:
Relativity and constituent quark structure in model calculations of
  parton distributions

abstract:
  According to recent studies, Parton Distribution Functions (PDFs) and
Generalized Parton Distributions (GPDs) can be evaluated in a Constituent Quark
Model (CQM) scenario, considering the constituent quarks as composite objects.
In here, a fully covariant model for a system of two particles, together with
its non relativistic limit, are used to calculate PDFs and GPDs. The analysis
permits to realize that by no means the effects of Relativity can be simulated
taking into account the structure of the constituent particles, the two effects
being independent and necessary for a proper description of available high
energy data in terms of CQM.


title: Triple product correlations in top squark decays

abstract:
  We propose several T-odd asymmetries in the decay chains of the top squarks
$\tilde t_m \to t \tilde \chi^0_k$ and $t\to bW^+\to bl\nu$ and $\tilde\chi^0_k
\to l^\pm\tilde l_n^\mp \to l^\pm l^\mp\tilde\chi^0_1$, for $l =e,\mu,\tau$. We
calculate the asymmetries within the Minimal Supersymmetric Standard Model with
complex parameters $M_1$, $\mu$ and $A_t$. We give the analytic formulae for
the decay distributions. We present numerical results for the asymmetries and
estimate the event rates necessary to observe them. The largest T-odd asymmetry
can be as large as 40%.


title: Effective Neutrino Mixing and Oscillations in Dense Matter

abstract:
  We investigate the effective case of two-flavor neutrino oscillations in
infinitely dense matter by using a perturbative approach. We begin by briefly
summarizing the conditions for the three-flavor neutrino oscillation
probabilities to take on the same form as the corresponding two-flavor
probabilities. Then, we proceed with the infinitely dense matter calculations.
Finally, we study the validity of the approximation of infinitely dense matter
when the effective matter potential is large, but not infinite, this is done by
using both analytic and numeric methods.


title: Mesonic correlators in hot QCD

abstract:
  Certain spacelike mesonic correlation lengths serve as interesting
theoretical probes for the reliability of perturbation theory in
high-temperature QCD, are directly sensitive to chiral symmetry restoration and
to the axial anomaly, and might also have indirect phenomenological signatures
in idealised heavy ion collision experiments. I review here the weak-coupling
predictions for some of these correlation lengths, to be compared with results
from lattice Monte Carlo simulations.


title: Impact of a precise top mass measurement

abstract:
  The physics impact of a precise determination of the top-quark mass, m_t, at
the Linear Collider (LC) is discussed, and the results are compared with the
prospective accuracy at the LHC. The importance of a precise knowledge of m_t
for electroweak precision observables and for Higgs physics in the MSSM is
pointed out in particular. We find that going from hadron collider to LC
accuracy in m_t leads to an improvement of the investigated quantities by up to
an order of magnitude.


title: Comparative analysis of Gallex and GNO solar neutrino data

abstract:
  Since the GALLEX and GNO datasets were derived from closely related
experiments, there is a natural tendency to merge them. This is perhaps
appropriate for any analysis based on the hypothesis that the solar neutrino
flux is constant, but it is not necessarily appropriate for an analysis that
allows for possible variability, since the GALLEX and GNO experiments belong to
different solar cycles. Moreover, we find significant differences between the
GALLEX and GNO datasets. It appears, from inspection of the time series and
histograms, that GNO measurements are compatible with the assumption that the
solar neutrino flux is constant, but GALLEX measurements are not. Furthermore,
power-spectrum analysis yields evidence of rotational modulation in GALLEX data
but not in GNO data. We compare our results with those of Pandola, who claims
that GALLEX-GNO data show no evidence for variability.


title: Exotica

abstract:
  The first evidence for Quantum Chromodynamics (QCD), the theory of the strong
interactions, came from the systematics of baryon and meson spectroscopy. An
important early observation was the apparent absence of exotics, baryons
requiring more than three quarks or mesons requiring more than quark-antiquark.
Years later, QCD is well established, hadron spectroscopy has been relatively
inactive, but the absence of exotics remains poorly understood. The recent
observation of narrow, prominent exotic baryons has stirred up new interest in
hadron spectroscopy. At present the experimental situation is confused; so is
theory. The recent discoveries are striking. So too is the complete absence of
exotic mesons, and, except for the recent discoveries, of exotic baryons as
well. Whether or not the new states are confirmed, the way we look at
complicated states of confined quarks and gluons has changed. Perhaps the most
lasting result, and the one emphasized in these notes, is a new appreciation
for the role of diquark correlations in QCD.


title:
Probing the gauge bosons $Z'$ and $B'$ from the Littlest Higgs model in
  the high-energy linear $e^{+}e^{-}$ colliders

abstract:
  The littlest Higgs (LH) model predicts the existence of the new gauge bosons
$Z'$ and $B'$. We calculate the contributions of these new particles to the
processes $e^{+}e^{-}\to\bar{f}f$ with $f=\tau, \mu, b,$ or $c$ and study the
possibility of detecting these new particles via these processes in the future
high-energy linear $e^{+}e^{-}$ collider (LC) experiments with
$\sqrt{s}=500GeV$ and $\pounds_{int}=340fb^{-1}$. We find that, with reasonable
values of the parameter preferred by the electroweak precision data, the
possible signals of these new particles might be detected. The $Z'$ mass
$M_{Z'}$ can be explored up to $2.8TeV$ via the process $e^{+}e^{-}\to\bar{b}b
$ for $0.3\leq c \leq 0.5 $ and the $B'$ mass $M_{B'}$ can be explored up to
$1.26TeV$ via the process $e^{+}e^{-}\to\bar{l}l $ for $0.64\leq c' \leq 0.73
$.


title: Model independent sum rules for strange form factors

abstract:
  We study chiral models with SU(3) group structure such as Skyrmion and chiral
bag to yield theoretical predictions of proton strange form factor comparable
to the recent experimental data of the SAMPLE Collaboration. For these
predictions we formulate model independent sum rules for proton strange form
factor in terms of baryon octet magnetic moments. We also investigate the
Becci-Rouet-Stora-Tyutin symmetries associated with the St\"uckelberg
coordinates, ghosts and anti-ghosts involved in the Skyrmion model.


title: Chiral Meson Physics at Two Loops

abstract:
  An overview of Chiral Perturbation Theory calculations in the mesonic sector
at the two Loop level is given. Discussed in some detail are the partially
quenched case relevant for lattice QCD, the general fitting procedures and
$\pi\pi$,$\pi K$ scattering as well as the determination of $V_{us}$ and
$K_{\ell3}$ decays.


title:
Neutrino Geophysics at Baksan (Part II): Possible Studies of
  Antineutrino- and Radiogenic Heat Sources in Earth Interior

abstract:
  Antineutrinos born inside the Earth (``geoneutrinos'') carry out information
of fundamental importance for understanding of the origin and evolution of our
planet. We show that Baksan Neutrino Observatory is one of the best sites for
detection and analysis of geoneutrinos using large liquid scintillation
spectrometer. Also we present a short story of concept of Earth as antineutrino
source (1960 - 2004 yy)


title: Symmetry Nonrestoration at High Temperature in Little Higgs Models

abstract:
  A detailed study of the high temperature dynamics of the scalar sector of
Little Higgs scenarios, proposed to stabilize the electroweak scale, shows that
the electroweak gauge symmetry remains broken even at temperatures much larger
than the electroweak scale. Although we give explicit results for a particular
modification of the Littlest Higgs model, we expect that the main features are
generic. As a spin-off, we introduce a novel way of dealing with scalar
fluctuations in nonlinear sigma models, which might be of interest for
phenomenological applications.


title:
Centrality Dependence of Thermal Parameters Deduced from Hadron
  Multiplicities in Au + Au Collisions at sqrt{s_{NN}} = 130 GeV

abstract:
  We analyse the centrality dependence of thermal parameters deduced from
hadron m ultiplicities in Au + Au collisions at $\sqrt{s_{NN}} = 130 GeV$.
While the chemical freeze-out temperature and chemical potentials are found to
be roughly centrality-independent, the strangeness saturation factor $\gamma_S$
increases with participant number towards unity, supporting the assumption of
equilibrium freeze-out conditions in central collisions.


title: Two flavor color superconductivity in nonlocal chiral quark models

abstract:
  We study the competence between chiral symmetry restoration and two flavor
color superconductivity (2SC) using a relativistic quark model with covariant
nonlocal interactions. We consider two different nonlocal regulators: a
Gaussian regulator and a Lorentzian regulator. We find that although the phase
diagrams are qualitative similar to those obtained using models with local
interactions, in our case the superconducting gaps at medium values of the
chemical potential are larger. Consequently, we obtain that in that region the
critical temperatures for the disappearance of the 2SC phase might be of the
order of 100-120 MeV. We also find that for ratios of the quark-quark and
quark-antiquark couplings somewhat above the standard value 3/4, the end point
and triple point in the $T-\mu$ phase diagram meet and a phase where both the
chiral and diquark condensates are non-negligible appears.


title: Raising the Higgs Mass in Supersymmetric Models

abstract:
  The minimal supersymmetric standard model, and extensions, predicts a
relatively light higgs particle if one supposes perturbativity until high
scales. That fact is in conflict with nowadays data coming from LEPII fruitless
searches for the Higgs boson. This bound is sufficient to rule out a big
portion of the parameter space of the MSSM. In this letter we propose two
mechanism of raising the higgs mass at tree level, thus not needing very heavy
sparticles that would reintroduce some fine-tuning in the problem.


title: Composite Vector Mesons and the Little Higgs Mechanism

abstract:
  I review a technique to embed vector mesons in the chiral Lagrangian of QCD,
and apply it to more general coset spaces, relevant for Little Higgs models.
The implementation of heavy spin-1 fields in Little Higgs models allows for a
better control over previously non calculable, ultra-violate sensitive
quantities, such as the Higgs couplings. A relevant application is the study of
vacuum alignment in the SU(6)/Sp(6) models.


title: Non-Abelian Discrete Family Symmetries of Leptons and Quarks

abstract:
  Recent progress is reviewed regarding the application of the non-Abelian
symmetries S_3, D_4, and A_4 to the understanding of family structure in
leptons and quarks.


title: The nature of the soft excitation at the critical end point of QCD

abstract:
  Using a large flavor number expansion and a gap equation for the pion mass
the chiral quark-meson model is solved at the lowest order in the fermion
contributions. In the chiral limit the tricritical point (TCP) is determined
analytically. The softening of the sigma particle is verified at this point and
is further investigated for a physical pion mass in the neighbourhood of the
critical endpoint (CEP).


title: Time Evolution of Hadronization and Grey Tracks in DIS off Nuclei

abstract:
  The analysis of the grey tracks produced in Deep Inelastic Scattering (DIS)
off nuclei provides important information on the space-time development of
hadronization in nuclear medium. This method is complementary to the
measurement of nuclear attenuation of leading inclusive hadrons. While the
latter is focused on the hadronization dynamics for the quite rare process of
leading hadrons production, the former covers the main bulk of inelastic
events, and its Q^2 dependence is a very sensitive tool to discriminate between
different models of hadronization. Employing the model of perturbative
hadronization developed earlier, we calculate the Q^2 and x_{Bj} dependences of
the number of collisions and relate it to the mean number of grey tracks, using
an empirical relation obtained from the analysis of data from the Fermilab E665
experiment on DIS of muons off the Xe nucleus. We found the number of grey
tracks to rise steeply with Q^2 in good agreement with the experimental data.


title:
Unitary model for the $\gamma p \to \gamma \pi^0 p$ reaction and the
  magnetic dipole moment of the $\Delta^+(1232)$

abstract:
  Radiative pion photoproduction in the $\Delta(1232)$ resonance region is
studied with the aim to access the $\Delta^+(1232)$ magnetic dipole moment. We
present a unitary model of the $\gamma p \to \gamma \pi N$ ($\pi N = \pi^0 p,
\pi^+ n$) reactions, where the $\pi N$ rescattering is included in an on-shell
approximation. In this model, the low energy theorem which couples the $\gamma
p \to \gamma \pi N$ process in the limit of a soft final photon to the $\gamma
p \to \pi N$ process is exactly satisfied. We study the sensitivity of the
$\gamma p \to \gamma \pi^0 p$ process at higher values of the final photon
energy to the $\Delta^+(1232)$ magnetic dipole moment. We compare our results
with existing data and give predictions for forthcoming measurements of angular
and energy distributions. It is found that the photon asymmetry and a helicity
cross section are particularly sensitive to the $\Delta^+$ magnetic dipole
moment.


title: PCAC and Shadowing of Low Energy Neutrinos

abstract:
  The Adler relation between reactions initiated by neutrinos and pions is easy
to misinterpret as a manifestation of the pion pole dominance. An axial
current, however, cannot fluctuate into a pion, but only to heavy axial-vector
states, since the lepton current is transverse. This is the miracle of the PCAC
hypothesis which dictates a specific conspiracy between the heavy fluctuations,
so that all together they mock the pion pole. Indeed, the observed Q^2
dependence of the axial form factor is controlled by the effective mass m_A
\sim 1 GeV, rather than the pion mass. On the contrary, the onset of nuclear
shadowing is governed by the small pion mass, rather than by the large axial
mass scale. This is in variance with the conventional wisdom which equates the
fluctuation lifetime and the coherence time. For the case of axial current they
are different by almost two orders of magnitude. As a result, neutrino
interactions are shadowed at very low energies of few hundred MeV, while energy
of about 10 GeV is needed to access nuclear shadowing for the vector current.
On the contrary to naive expectations, nuclear absorption enhances, rather than
suppresses the cross section of coherent neutrino-production of pions which is
the strongest channel (half of the total cross section) in the black disc
limit.


title: Modeling the Pion and Kaon Form Factors in the Timelike Region

abstract:
  New, accurate measurements of the pion and kaon electromagnetic form factors
are expected in the near future from experiments at electron-positron
colliders,using the radiative return method. We construct a model for the
timelike pion electromagnetic form factor, that is valid also at momentum
transfers far above the $\rho$ resonance. The ansatz is based on vector
dominance and includes a pattern of radial excitations expected from dual
resonance models.The form factor is fitted to the existing data in the timelike
region, continued to the spacelike region and compared with the measurements
there and with the QCD predictions. Furthermore, the model is extended to the
kaon electromagnetic form factor. Using isospin and SU(3)-flavour symmetry
relations we extract the isospin-one contribution and predict the kaon weak
form factor accessible in semileptonic $\tau$ decays.


title:
Extraction of the charged pion polarizabilities from radiative charged
  pion photoproduction in Heavy Baryon Chiral Perturbation Theory

abstract:
  We analyze the amplitude of radiative charged pion photoproduction within the
framework of heavy baryon chiral perturbation theory (HBChPT) and discuss the
best experimental setup for the extraction of the charged pion polarizabilities
from the differential cross section. We find that the contributions from two
unknown low energy constants(LECs) in the $\pi N$ chiral Lagrangian at order
$p^{3}$ are comparable with the contributions of the charged pion
polarizabilities. As a result, it is necessary to take these two LECs' effects
into account. Furthermore, we discuss the applicability of the extrapolation
method and conclude that this method is applicable only if the polarization
vector of the incoming photon is perpendicular to the scattering plane in the
center of mass frame of the final $\gamma-\pi$ system.


title: Equivalence Classes in Gauge Theory on the Orbifold $S^1/Z_2$

abstract:
  After a brief review of orbifold grand unified theory, we discuss two topics
related to the choice of boundary conditions on the orbifold $S^1/Z_2$:
dynamical rearrangement of gauge symmetry and equivalence classes of boundary
conditions.


title: Studying Higgs bosons by top pair production at photon colliders

abstract:
  We study the effect of heavy neutral Higgs bosons on the top pair production
process at photon linear colliders.The interference patterns betwenn the
resonant Higgs production amplitudes and the continuum QED amplitudes are
examined. The patterns are sensitive to the phase of the photon-photon-Higgs
vertex which is a good probe of new charged particles.


title: Dilatonic Inflation and SUSY Breaking in Modular-Invariant Supergravity

abstract:
  The theory of inflation will be investigated as well as supersymmetry
breaking in the context of supergravity, incorporating the target-space duality
and the non-perturbative gaugino condensation in the hidden sector. The
inflation and supersymmetry breaking occur at once by the interplay between the
dilaton field as inflaton and the condensate gauge-singlet field. The model
satisfies the slow-roll condition which solves the eta-problem. When the
particle rolls down along the minimized trajectry of the potential V(S,Y) at a
duality invariant fixed point T=1, we can obtain the e-fold value \sim 57. And
then the cosmological parameters obtained from our model well match with the
recent WMAP data combined with other experiments. This observation is
suggesting to consider the string-inspired supergravity as the fundamental of
the theory of the evolution of the universe as well as the particle theory.


title: Chiral phase transition in hadronic matter at non-zero baryon density

abstract:
  A qualitative analysis of the chiral phase transition in QCD at non--zero
baryon density is performed. It is assumed that at zero baryonic density,
$\rho=0$, the temperature phase transition is of the second order and quark
condesate $\eta= \mid < 0\mid \bar{u} u\mid 0> \mid =\mid< 0 \mid \bar{d}d\mid
0 >\mid $ may be taken as order parameter of phase transition. It is
demonstrated, that the proportionality of baryon masses to quark condensate in
the power 1/3, $m_B \sim \mid < 0 \mid {\bar q} q \mid 0 > \mid^{1/3}$ is valid
in the wide interval of quark condensate values. By supposing, that such
specific dependence of baryon masses on quark condensate takes place up to
phase transition point, it is shown, that at finite baryon density $\rho$ the
phase transition becomes of the first order at the temperature
$T=T_{\mathrm{ph}}(\rho)$ for $\rho>0$. At temperatures
$T_{\mathrm{cont}}(\rho) > T > T_{\mathrm{ph}}(\rho)$ there is a mixed phase
consisting of the quark phase (stable) and the hadron phase (unstable). At the
temperature $T = T_{\mathrm{cont}}(\rho)$ the system experiences a continuous
transition to the pure chirally symmetric phase.


title: (Pseudo) Dirac neutrino masses in Supergravity

abstract:
  In this talk, we discuss the idea of how Dirac or Pseudo-Dirac neutrino
masses arise naturally with a correct size, after the breaking of local N=1
supersymmetry.


title: Classical fields and heavy ion collisions

abstract:
  This is a review of numerical applications of classical gluodynamics to heavy
ion collisions. We recall some results from calculations of gluon production,
discuss their implications for heavy ion phenomenology, and outline a strategy
to calculate the number of quark pairs produced by these classical fields.


title:
Higgs boson production at hadron colliders: differential cross sections
  through next-to-next-to-leading order

abstract:
  We present a calculation of the fully differential cross section for Higgs
boson production in the gluon fusion channel through next-to-next-to-leading
order in perturbative QCD. We apply the method introduced in
\cite{Anastasiou:2003gr} to compute double real emission corrections. Our
calculation permits arbitrary cuts on the final state in the reaction $hh \to H
+ X$. It can be easily extended to include decays of the Higgs boson into
observable final states. In this Letter, we discuss the most important features
of the calculation, and present some examples of physical applications that
illustrate the range of observables that can be studied using our result. We
compute the NNLO rapidity distribution of the Higgs boson, and also calculate
the NNLO rapidity distribution with a veto on jet activity.


title: Chiral perturbation theory confronted with experiment

abstract:
  The general framework and the present status of the low energy theory of the
standard model are briefly reviewed. Recent applications to a few topic of
interest for the determinations of Vud and of Vus are discussed


title: Transport coefficients and the 2PI effective action in the large N limit

abstract:
  We discuss the computation of transport coefficients in large N_f QCD and the
O(N) model for massive particles. The calculation is organized using the 1/N
expansion of the 2PI effective action to next-to-leading order. For the gauge
theory, we verify gauge fixing independence and consistency with the Ward
identity. In the gauge theory, we find a nontrivial dependence on the fermion
mass.


title: Next-to-leading electroweak logarithms at two loops

abstract:
  We review a recent calculation of the two-loop next-to-leading logarithmic
electroweak corrections to the form factors for massless chiral fermions
coupling to an SU(2)xU(1) singlet gauge boson.


title: QCD phase diagram in nonlocal chiral quark models

abstract:
  The QCD phase diagram is analyzed within chiral quark models with nonlocal
separable interactions. For the case of two light flavors, we describe in
detail the characteristics of the chiral phase transition in the T-mu plane,
and analyze the color superconducting phase transition taking place at
relatively large chemical potentials. We also consider the three-flavor version
of the models, analyzing the predictions for masses and decay constants of
light pseudoscalar mesons.


abstract:
  Summary of the Latin American Workshop on Fundamental Interactions held at
the Physics Department of the Universidad de Buenos Aires from 26 to 30 July
2004.


title:
Improved description of charged Higgs boson production at hadron
  colliders

abstract:
  We present a new method for matching the two twin-processes gb->H+/-t and
gg->H+/-tb in Monte Carlo event generators. The matching is done by defining a
double-counting term, which is used to generate events that are subtracted from
the sum of these two twin-processes. In this way we get a smooth transition
between the collinear region of phase space, which is best described by
gb->H+/-t, and the hard region, which requires the use of the gg->H+/-tb
process. The resulting differential distributions show large differences
compared to both the gb-> H+/-t and gg->H+/-tb processes illustrating the
necessity to use matching when tagging the accompanying b-jet.


title: Distinguishing between SU(5) and flipped SU(5)

abstract:
  We study in detail the d=6 operators for proton decay in the two possible
matter unification scenarios based on SU(5) gauge symmetry. We investigate the
way to distinguish between these two scenarios. The dependence of the branching
ratios for the two body decays on the fermion mixing is presented in both
cases. We point out the possibility to make a clear test of flipped SU(5)
through the decay channel p \to \pi^+ \bar{\nu}, and the ratio \tau(p \to K^0
e^+_{\alpha}) / \tau(p \to \pi^0 e^+_{\alpha}).


title: Lepton Flavor Violating Decays, Soft Leptogenesis and SUSY SO(10)

abstract:
  We investigate lepton flavor violating decays in a SUSY SO(10) model with
symmetric textures recently constructed by us. Unlike the models with lop-sided
textures which give rise to a large decay rate for mu -> e gamma, the decay
rate we get is much suppressed and yet it is large enough to be accessible to
the next generation of experiments. We have also investigated the possibility
of baryogenesis resulting from soft leptogenesis. We find that with the soft
SUSY masses assuming their natural values, B^\prime \equiv \sqrt{BM_{1}} ~ 1.4
TeV and Im(A) ~ 1 TeV, the observed baryon asymmetry in the Universe can be
accommodated in our model. We have also updated the predictions of our model
for the masses, mixing angles and CP violating measures in both charged fermion
and neutrino sectors, using the most up-to-date experimental data as input.


title: Renormalized Polyakov Loops, Matrix Models and the Gross-Witten Point

abstract:
  The values of renormalized Polyakov loops in the three lowest representations
of SU(3) were measured numerically on the lattice. We find that in magnitude,
condensates respect the large-N property of factorization. In several ways, the
deconfining phase transition for N=3 appears to be like that in the N=infinity
matrix model of Gross and Witten. Surprisingly, we find that the values of the
renormalized triplet loop are described by an SU(3) matrix model, with an
effective action dominated by the triplet loop. Future numerical simulations
with a larger number of colors should be able to show whether or not the
deconfining phase transition is close to the Gross-Witten point.


title:
Searching for realistic 4d string models with a Pati-Salam symmetry --
  Orbifold grand unified theories from heterotic string compactification on a
  Z6 orbifold

abstract:
  Motivated by orbifold grand unified theories, we construct a class of
three-family Pati-Salam models in a Z6 abelian symmetric orbifold with two
discrete Wilson lines. These models have marked differences from
previously-constructed three-family models in prime-order orbifolds. In the
limit where one of the six compactified dimensions (which lies in a Z2
sub-orbifold) is large compared to the string length scale, our models
reproduce the supersymmetry and gauge symmetry breaking pattern of 5d orbifold
grand unified theories on an S1/Z2 orbicircle. We find a horizontal 2+1
splitting in the chiral matter spectra -- 2 families of matter are localized on
the Z2 orbifold fixed points, and 1 family propagates in the 5d bulk -- and
identify them as the first-two and third families. Remarkably, the first two
families enjoy a non-abelian dihedral D4 family symmetry, due to the geometric
setup of the compactified space. In all our models there are always some color
triplets, i.e. (6,1,1) representations of the Pati-Salam group, survive
orbifold projections. They could be utilized to spontaneously break the
Pati-Salam symmetry to that of the Standard Model. One model, with a 5d E6
symmetry, may give rise to interesting low energy phenomenology. We study gauge
coupling unification, allowed Yukawa couplings and some of their
phenomenological consequences. The E6 model has a renormalizable Yukawa
coupling only for the third family. It predicts a gauge-Yukawa unification
relation at the 5d compactification scale, and is capable of generating
reasonable quark/lepton masses and mixings. Potential problems are also
addressed, they may point to the direction for refining our models.


title: Lattice QCD and Flavor Physics

abstract:
  Now that lattice QCD simulations are able to include effects of light sea
quarks, the prospects are good for constraining quark flavor phenomenology.
This review talk for particle physics experimentalists begins with an
introduction intended to describe broadly the steps of lattice Monte Carlo
simulations. The remainder of the talk is a brief survey of recent and ongoing
calculations relevant for quark flavor physics.


title:
Mixed tensor susceptibility of the QCD vacuum from effective quark-quark
  interactions

abstract:
  We calculate the mixed tensor susceptibility of QCD vacuum in the framework
of the global color symmetry model. In our calculation, the functional
integration over gluon fields can be performed and the gluonic vacuum
observable can be expressed in terms of the quark operators and the gluon
propagator. The mixed tensor susceptibility was obtained with the subtraction
of the perturbative contribution which is evaluated by the Wigner solution of
the quark gap equation. Using several different effective quark-quark
interaction models, we find the values of the mixed tensor susceptibility are
very small.


title: Structure and production of Theta+

abstract:
  We study properties of the pentaquark particle Theta+ with emphasis on the
role of chiral symmetry.
  It is shown that when chiral force is sufficiently strong, the positive
parity Theta+ may be realized with a lower mass relative to the negative parity
state.
  The decay width is then studied in the non-relativistic quark model.
  It is shown that the narrow width may be realized for the positive parity
state, while the seemingly lowest negative parity state couples strongly to the
continuum state resulting in a very broad width.
  Finally, Theta+ production is studied in photo-induced and proton-induced
processes.
  The polarized proton reaction provides a model independent method to
determine the parity of Theta+.


title: Decay of Theta+ in a quark model

abstract:
  We study the decay of Theta+ in a non-relativistic quark model. The wave
function of Theta+ is constructed for the two cases JP = 1/2+- as products of
color, spin, flavor and orbital parts respecting total antisymmetrization among
the four quarks. We find that for the negative parity Theta+ the width becomes
very large which is of order of several hundreds MeV, while it is about a
several tens MeV for the positive parity. By assuming additionally diquark
correlations, the width is reduced to be of order 10 MeV. It is also pointed
out that a similar calculation for 3/2- results in strong suppression of its
width.


title: Effects of Instanton Induced Interaction on the Pentaquarks

abstract:
  Roles of instanton induced interactions (III) in the masses of pentaquark
baryons, Theta^+ (J=1/2 and 3/2) and Xi^{--}, and a dibaryon, H, are discussed
using the MIT bag model in the negative parity case. It is shown that the
two-body terms in III give a strong attraction mainly due to the increase of
the number of pairs in multi-quark systems. In contrast, the three-body u-d-s
interaction is repulsive. It is found that III lowers the mass of Theta^+ as
much as 100 MeV from the mass predicted by the bag model without III.


title: Searching for Dark Matter with Future Cosmic Positron Experiments

abstract:
  Dark matter particles annihilating in the Galactic halo can provide a flux of
positrons potentially observable in upcoming experiments, such as PAMELA and
AMS-02. We discuss the spectral features which may be associated with dark
matter annihilation in the positron spectrum and assess the prospects for
observing such features in future experiments. Although we focus on some
specific dark matter candidates, neutralinos and Kaluza-Klein states, we carry
out our study in a model independent fashion. We also revisit the positron
spectrum observed by HEAT.


title: About the Casimir scaling hypothesis

abstract:
  A lattice calculation shows that the Casimir scaling hypothesis is well
verified in QCD, that is to say that the potential between two opposite color
charges in a color singlet is proportional to the value of the quadratic
Casimir operator. On the other hand, in a bag model calculation for the same
system, a scaling of the string tension with the square root of the quadratic
Casimir operator is obtained. It is shown that, within the same formalism but
with the assumption that the width of the string is independent of the color
charges, the string tension is proportional to value of the quadratic Casimir
operator. Some considerations about the color behavior of the total interaction
are given.


title: Simulating W/Z+jets production at the Tevatron

abstract:
  The merging procedure of tree-level matrix elements and the subsequent parton
shower as implemented in the new event generator SHERPA will be validated for
the example of W/Z+jets production at the Tevatron. Comparisons with results
obtained from other approaches and programs and with experimental results
clearly show that the merging procedure yields relevant and correct results at
both the hadron and parton levels.


title: 2S Hyperfine splitting of muonic hydrogen

abstract:
  Corrections of orders alpha^5, alpha^6 are calculated in the hyperfine
splitting of the 2S state in the muonic hydrogen. The nuclear structure effects
are taken into account in the one- and two-loop Feynman amplitudes by means of
the proton electromagnetic form factors. Total numerical value of the 2S state
hyperfine splitting 22.8148 meV in the (\mu p) can be considered as reliable
estimation for the corresponding experiment with the accuracy 10^{-5}. The
value of the Sternheim's hyperfine splitting interval [8\Delta
E^{HFS}(2S)-\Delta E^{HFS}(1S)] is obtained with the accuracy 10^{-6}.


title: Cosmological bounds on masses of neutrinos and other thermal relics

abstract:
  With the advent of precision data, cosmology has become an extremely powerful
tool for probing particle physics. The prime example of this is the
cosmological bound on light neutrino masses. Here I review the current status
of cosmological neutrino mass bounds as well as the various uncertainties
involved in deriving them. From WMAP, SDSS, and Lyman-alpha forest data an
upper bound on the sum of neutrino masses of 0.65 eV (95% C.L.) can be derived
with any assumptions about bias. I also present new limits on other light,
thermally produced particles. For example, a hypothetical new Majorana fermion
decoupling around the electroweak phase transition must have m < 5 eV.


title:
Systematic limits on sin^2{2theta_{13}} in neutrino oscillation
  experiments with multi-reactors

abstract:
  Sensitivities to sin^2{2theta_{13}} without statistical errors (``systematic
limit'') are investigated in neutrino oscillation experiments with multiple
reactors. Using an analytical approach, we show that the systematic limit on
sin^2{2theta_{13}} is dominated by the uncorrelated systematic error sigma_u of
the detector. Even in an experiment with multi-detectors and multi-reactors, it
turns out that most of the systematic errors including the one due to the
nature of multiple sources is canceled as in the case with a single reactor
plus two detectors, if the near detectors are placed suitably. The case of the
KASKA plan (7 reactors and 3 detectors) is investigated in detail, and it is
explicitly shown that it does not suffer from the extra uncertainty due to
multiple reactors.


title: Exclusive production of vector mesons in QCD

abstract:
  We compare results of our recent studies on vector meson production within
the QCD factorization at next-to-leading order with HERA data.


title: Electromagnetic proton form factors in large $N_{c}$ QCD

abstract:
  The electromagnetic form factors of the proton are obtained using a
particular realization of QCD in the large $N_c$ limit (${QCD}_{\infty}$),
which sums up the infinite number of zero-width resonances to yield an Euler's
Beta function (Dual-${QCD}_{\infty}$). The form factors $F_1(q^2)$ and
$F_2(q^2)$, as well as $G_M(q^2)$ agree very well with reanalyzed space-like
data in the whole range of momentum transfer. In addition, the predicted ratio
$\mu_p G_E/G_M$ is in good agreement with recent polarization transfer
measurements at Jefferson Lab.


title: Mesonic states and vacuum replicas in potential quark models for QCD

abstract:
  In this paper, we study generic non-local NJL models for four-dimensional QCD
in the limit of a large number of colours. We diagonalise, through a
Bogoliubov-type transformation, the Hamiltonian of the model completely in
terms of the compound operators creating/annihilating mesons - bound states of
dressed quarks and antiquarks - and demonstrate a one-to-one correspondence
between the Bogoliubov diagonalisation condition and the Bethe-Salpeter
equation for bound states. We conclude that, in the leading order in N_C, the
nontrivial contents of the theory is entirely encoded in the chiral angle - the
solution to the mass-gap equation for dressed quarks. As a consequence, we
extend the statement of existence of excited solutions to the mass-gap
equation, called vacuum replicas, beyond the BCS level and prescribe a new
index to the mesonic operators - the label of the vacuum state in which the
corresponding meson is created.


title: Decoupling Supersymmetry/Higgs without fine-tuning

abstract:
  We propose a simple superpotential for the Higgs doublets, where the
electroweak symmetry is broken at the supersymmetric level. We show that, for a
class of supersymmetry breaking scenarios, the electroweak scale can be stable
even though the supersymmetry breaking scale is much higher than it. Therefore,
all the superpartners and the Higgs bosons can be decoupled from the
electroweak scale, nevertheless no fine-tuning is needed. We present a concrete
model, as an existence proof of such a model, which generates the
superpotential dynamically. According to supersymmetry breaking scenarios to be
concerned, various phenomenological applications of our model are possible. For
example, based on our model, the recently proposed ``split supersymmetry''
scenario can be realized without fine-tuning. If the electroweak scale
supersymmetry breaking is taken into account, our model provides a similar
structure to the recently proposed ``fat Higgs'' model and the upper bound on
the lightest Higgs boson mass can be relaxed.


title: Finite Temperature Gauge Theory from the Transverse Lattice

abstract:
  Numerical computations are performed and analytic bounds are obtained on the
excited spectrum of glueballs in SU(infinity) gauge theory, by transverse
lattice Hamiltonian methods. We find an exponential growth of the density of
states, implying a finite critical (Hagedorn) temperature. It is argued that
the Nambu-Goto string model lies in a different universality class.


title: Subleading Shape Functions in Inclusive B Decays

abstract:
  The contributions of subleading shape functions to inclusive decay
distributions of B mesons are derived from a systematic two-step matching of
QCD current correlators onto soft-collinear and heavy-quark effective theory.
At tree-level, the results can be expressed in terms of forward matrix elements
of bi-local light-cone operators. Four-quark operators, which arise at O(g^2),
are included. Their effects can be absorbed entirely into a redefinition of
other shape functions. Our results are in disagreement with some previous
studies of subleading shape-function effects in the literature. A numerical
analysis of B->X_u+l+nu decay distributions suggests that power corrections are
small, with the possible exception of the endpoint region of the charged-lepton
energy spectrum.


title: Exploring the QCD phase diagram with compact stars

abstract:
  We investigate a nonlocal chiral quark model with separable 4-fermion
interaction for the case of U(3) flavor symmetry and show that strange quark
matter is unlikely to occur in a large enough volume of a compact star to
entail remarkable observational consequences. The phase diagram in the
two-flavor sector of such model has a critical end point of the line of first
order chiral/deconfinement phase transitions on which a triple point marks the
junction with the critical line for second order phase transitions to
two-flavor color superconductivity (2SC) below T~80 MeV. Stable hybrid star
configurations with large quark matter core in a color superconducting phase
can exist. A consistent cooling phenomenology requires that all quark species
be gapped, the minimal pairing gap of the order of 10 - 100 keV.


title: Getting SM and New Physics CP phases from $B$ Decays

abstract:
  A method to extract Standard Model(SM) CP phases involving B decays is
presented. The method involves a pair of decays where one decay receives a
significant $b \to d$ penguin contribution while the second has a significant
$b \to s$ penguin contribution, but is dominated by a single amplitude. SM CP
phase information is obtained using the fact that the $b \to s$ transition
amplitude is related by SU(3) to a piece of the amplitude with the $b \to d$
transition. If there is significant new physics only in $b \to s$ transitions
and not in $b \to d$ transitions then this method can be used to measure new
physics(NP) phases.


title:
Azimuthal Angular Distributions in EDDE as Spin-Parity Analyser and
  Glueball Filter for LHC

abstract:
  Exclusive Double Diffractive Events (EDDE) are analysed as the source of
information about the central system. Experimental possibilities for exotic
particles searches are considered. From the reggeized tensor current picture
some azimuthal angle dependences were obtained to fit the data from WA102
experiment and to make predictions for LHC collider.


title: Hard diffraction from parton rescattering in QCD

abstract:
  We analyze the QCD dynamics of diffractive deep inelastic scattering. The
presence of a rapidity gap between the target and diffractive system requires
that the target remnant emerges in a color singlet state, which we show is made
possible by the soft rescattering of the struck quark. This rescattering is
described by the path-ordered exponential (Wilson line) in the expression for
the parton distribution function of the target. The multiple scattering of the
struck parton via instantaneous interactions in the target generates dominantly
imaginary diffractive amplitudes, giving rise to an "effective pomeron"
exchange. The pomeron is not an intrinsic part of the proton but a dynamical
effect of the interaction. This picture also applies to diffraction in
hadron-initiated processes. Due to the different color environment the
rescattering is different in virtual photon- and hadron-induced processes,
explaining the observed non-universality of diffractive parton distributions.
This framework provides a theoretical basis for the phenomenologically
successful Soft Color Interaction model which includes rescattering effects and
thus generates a variety of final states with rapidity gaps. We discuss
developments of the SCI model to account for the color coherence features of
the underlying subprocesses.


title: Fragmentation of bottom quarks in top quark decay

abstract:
  We review the main aspects of the fragmentation of bottom quarks in top quark
decay. The NLO b-quark energy spectrum presents large mass logarithms
ln(m_t^2/m_b^2), which can be resummed by the use of the approach of
perturbative fragmentation functions. Large soft contributions in both
coefficient function and initial condition of the perturbative fragmentation
function have been resummed as well. Results on the energy distribution of b
quarks and b-flavoured hadrons are finally presented in both x and moment
spaces.


title: Coalescence model for Theta_c pentaquark formation

abstract:
  We present a model for the formation of the charmed pentaquark Theta_c in
hard scattering processes such as deep inelastic scattering, e^+e^-
annihilation, and high-energy p pbar collisions. The model assumes that the
cross section for Theta_c formation is proportional to the rate of production
of p D^{*-} (or pbar D^{*+}) pairs in close proximity both in momentum space
and in coordinate space. The constant of proportionality is determined from the
Theta_c cross section in deep inelastic scattering as reported by the H1
experiment. The HERWIG Monte Carlo is used to generate simulated DIS events and
also to model the space-time structure of the final state. Requiring the proton
and the D^* be within a 100 MeV mass window and separated by a spacelike
distance of no more than 2 fm, we find that a large "coalescence enhancement
factor" F_co \sim 10 is required to account for the H1 signal. The same
approach is then applied in order to estimate the number and characteristics of
Theta_c events produced at LEP and the Tevatron.


title: Predictions for multi-particle final states with SHERPA

abstract:
  In this contribution the new event generation framework SHERPA will be
presented, which aims at a full simulation of events at current and future
high-energy experiments. Some first results related to the production of weak
vector bosons in association with jets at the Tevatron and the LHC will be
discussed.


title: Renormalized thermodynamics from the 2PI effective action

abstract:
  High-temperature resummed perturbation theory is plagued by poor convergence
properties. The problem appears for theories with bosonic field content such as
QCD, QED or scalar theories. We calculate the pressure as well as other
thermodynamic quantities at high temperature for a scalar one-component field
theory, solving a three-loop 2PI effective action numerically without further
approximations. We present a detailed comparison with the two-loop
approximation. One observes a strongly improved convergence behavior as
compared to perturbative approaches. The renormalization employed in this work
extends previous prescriptions, and is sufficient to determine all counterterms
required for the theory in the symmetric as well as the spontaneously broken
phase.