title:
On the Sigma^0 --> Lambda^0 + gamma decay in the Effective quark model
  with chiral U(3)xU(3) symmetry

abstract:
  We analyse the angular distributions of the Sigma^0 -->
  Lambda^0 + gamma decay rate in the laboratory and in the rest frame of the
Sigma^0 - hyperon in the dependence on baryon polarizations. We calculate the
dynamical polarization vector of the Lambda^0 - hyperon. Within the Effective
quark model with chiral U(3) x U(3) symmetry (PRC 59, 451 (1999)) we calculate
the transition magnetic moment mu_(Sigma^0 Lambda^0). The theoretical value
mu_(Sigma^0 Lambda^0) = - 1.62, measured in nuclear magnetons, agrees well with
the experimental data |mu^(\exp)_(Sigma^0 Lambda^0)| = (1.61 +/-0.08) and the
theoretical result, predicted within the naive quark model mu_(Sigma^0
Lambda^0) = (\sqrt{3}/4)(mu_(Sigma^-) - mu_(\Sigma^+)) = (- 1.57 +/- 0.01).


title: Pressure of the Standard Model Near the Electroweak Phase Transition

abstract:
  We extend our previous determination of the thermodynamic pressure of the
Standard Model so that the result can be applied down to temperatures
corresponding to the electroweak crossover. This requires a further resummation
which can be cleanly organised within the effective theory framework. The
result allows for a precise determination of the expansion rate of the Universe
for temperatures around the electroweak crossover.


title:
Model Independent Constraints on Non-electronic Flavors in the Solar
  Boron Neutrino Flux

abstract:
  We perform the most general model independent analysis of the latest 391-Day
Salt Phase SNO Data Set incorporating the Super-Kamiokande ES flux measurement
and obtain bounds on the antineutrino and sterile neutrino flux in the solar
$^{8}$B neutrino flux reaching the detectors on the earth. The muon/ tauon
antineutrino flux is found to be disallowed at 1.4$\sigma $ C.L. The sterile
flux is found to be non-zero at about 1.26 standard deviations.


title:
Probing Very High Energy Prompt Muon and Neutrino fluxes and the cosmic
  ray knee via Underground Muons

abstract:
  We calculate event rate and demonstrate the observational feasibility of very
high energy muons (1-1000 TeV) in a large mass underground detector operating
as a pair-meter. This energy range corresponds to surface muon energies of
$\sim$(5 TeV - 5000 TeV) and primary cosmic ray energies of $\sim$ (50 TeV - 5
$\times 10^4$ TeV). Such measurements would significantly assist in an improved
understanding of the prompt contribution to $\nu_e, \nu_{\mu}$ and $\mu$ fluxes
in present and future ultra-high energy neutrino detectors. In addition, they
would shed light on the origin of the observed 'knee' in the cosmic ray
spectrum.


title: Electron-positron annihilation into three pions and the radiative return

abstract:
  The Monte Carlo event generator PHOKHARA, which simulates hadron and muon
production at electron-positron colliders through radiative return, has been
extended to final states with three pions. A model for the form factor based on
generalized vector dominance has been employed, which is consistent with
presently available experimental observations.


title:
Precision measurement of the top quark mass from M_{b l} distribution in
  t -> b l \nu decays

abstract:
  The method of the top quark mass measurement from $M_{b l}$ distribution in
$t \to b l \nu$ decays can be considerably improved if applying the technique
of moments and proceeding to moments of high degree. At the LHC this allows one
to reduce the systematic and statistical errors of the top mass by more than a
factor of two.


title: The Physics of Extra Dimensions

abstract:
  Lowering the string scale in the TeV region provides a theoretical framework
for solving the mass hierarchy problem and unifying all interactions. The
apparent weakness of gravity can then be accounted by the existence of large
internal dimensions, in the submillimeter region, and transverse to a
braneworld where our universe must be confined. I review the main properties of
this scenario and its implications for observations at both particle colliders,
and in non-accelerator gravity experiments. Such effects are for instance the
production of Kaluza-Klein resonances, graviton emission in the bulk of extra
dimensions, and a radical change of gravitational forces in the submillimeter
range. I also discuss the warped case and localization of gravity in the
presence of infinite size extra dimensions.


title: BaBar results on e+e- --> ppbar by means of initial state radiation

abstract:
  BaBar has measured with unprecedented accuracy the e+e- --> ppbar cross
section from the threshold up to Q^2 ~ 20 GeV^2/c^4, finding out an unexpected
cross section, with plateaux and negative steps. Evidence for a ratio
|G_E/G_M|>1 has also been found as well as a sudden variation in |G_M| just
above the threshold.


title: BEC and the particle mass

abstract:
  We derive new features of Bose-Einstein correlations by means of Quantum
Field Theory at finite temperature, supplemented by operator-field evolution
approach. The origin of the dependence of the measured two-particle correlation
function (as well as the so-called correlation radius) on the particle mass has
received its correct explanation. The lower bound on the particle emitting
source size is estimated.


title:
A simple toy model for effective restoration of chiral symmetry in
  excited hadrons

abstract:
  A simple solvable toy model exhibiting effective restoration of chiral
symmetry in excited hadrons is constructed. A salient feature is that while
physics of the low-lying states is crucially determined by the spontaneous
breaking of chiral symmetry, in the high-lying states the effects of chiral
symmetry breaking represent only a small correction. Asymptotically the states
approach the regime where their properties are determined by the underlying
unbroken chiral symmetry.


title: Consequences of strong fluctuations on high-energy QCD evolution

abstract:
  We investigate the behaviour of the QCD evolution towards high-energy, in the
diffusive approximation, in the limit where the fluctuation contribution is
large. Our solution for the equivalent stochastic Fisher equation predicts the
amplitude as well as the whole set of correlators in the strong noise limit.
The speed of the front and the diffusion coefficient are obtained. We analyse
the consequences on high-energy evolution in QCD.


title: Enlightenment, Knowledge, Ignorance, Temptation

abstract:
  I discuss the historical and conceptual roots of reasoning about the
parameters of fundamental physics and cosmology based on selection effects. I
argue concretely that such reasoning can and should be combined with arguments
based on symmetry and dynamics; it supplements them, but does not replace them.


title: Implications of Neutrino Mass Generation from QCD Confinement

abstract:
  We consider the possibility that the quark condensate formed by QCD
confinement generates Majorana neutrino masses m_\nu via dimension seven
operators. No degrees of freedom beyond the Standard Model are necessary, below
the electroweak scale. Obtaining experimentally acceptable neutrino masses
requires the new physics scale \Lambda ~ TeV, providing a new motivation for
weak-scale discoveries at the LHC. We implement this mechanism using a Z_3
symmetry which leads to a massless up quark above the QCD chiral condensate
scale. We use non-helicity-suppressed light meson rare decay data to constrain
\Lambda. Experimental constraints place a mild hierarchy on the flavor
structure of dimension seven operators and the resulting neutrino mass matrix.


title: Persistent Fine-Tuning in Supersymmetry and the NMSSM

abstract:
  We examine the use of modified Higgs sectors to address the little hierarchy
problem of supersymmetry. Such models reduce weak-scale fine-tuning by allowing
lighter stops, but they retain some fine-tuning independent of the Higgs. The
modified Higgs sector can also introduce model-dependent tunings. We consider
the model-independent constraints on naturalness from squark, gluino, chargino
and neutralino searches, as well as the model-dependent tuning in the PQ- and
R-symmetric limits of the NMSSM, where cascade decays or additional quartic
interactions can hide a Higgs without relying on heavy stops. Obtaining viable
electroweak symmetry breaking requires a tuning of $\sim 1-10%$ in the PQ
limit. A large A-term is also necessary to make charginos sufficiently heavy,
and this introduces an additional weak-scale tuning of $\sim 10%$. The
R-symmetric limit requires large marginal couplings, a large singlet soft mass,
and a tuning of $\sim 5-10%$ to break electroweak symmetry. Hiding MSSM-like
Higgs states below $\approx 112$ GeV requires additional tunings of A-terms at
the $\sim 1-10%$ level. Thus, although the NMSSM has rich discovery potential,
it suffers from a unique fine-tuning problem of its own.


title: Supersymmetry and the LHC Inverse Problem

abstract:
  Given experimental evidence at the LHC for physics beyond the standard model,
how can we determine the nature of the underlying theory? We initiate an
approach to studying the "inverse map" from the space of LHC signatures to the
parameter space of theoretical models within the context of low-energy
supersymmetry, using 1808 LHC observables including essentially all those
suggested in the literature and a 15 dimensional parametrization of the
supersymmetric standard model. We show that the inverse map of a point in
signature space consists of a number of isolated islands in parameter space,
indicating the existence of "degeneracies"--qualitatively different models with
the same LHC signatures. The degeneracies have simple physical
characterizations, largely reflecting discrete ambiguities in electroweak-ino
spectrum, accompanied by small adjustments for the remaining soft parameters.
The number of degeneracies falls in the range 1<d<100, depending on whether or
not sleptons are copiously produced in cascade decays. This number is large
enough to represent a clear challenge but small enough to encourage looking for
new observables that can further break the degeneracies and determine at the
LHC most of the SUSY physics we care about. Degeneracies occur because
signatures are not independent, and our approach allows testing of any new
signature for its independence. Our methods can also be applied to any other
theory of physics beyond the standard model, allowing one to study how model
footprints differ in signature space and to test ways of distinguishing
qualitatively different possibilities for new physics at the LHC.


title: Universality and m_X cut effects in B -> Xs l+ l-

abstract:
  The most precise comparison between theory and experiment for the B -> Xs l+
l- rate is in the low q^2 region, but the hadronic uncertainties associated
with an experimentally required cut on m_X potentially spoil the search for new
physics in these decays. We show that a 10-30% reduction of d\Gamma(B -> Xs l+
l-) / dq^2 due to the m_X cut can be accurately computed using the B -> X_s
gamma shape function. The effect is universal for all short distance
contributions in the limit m_X^2 << m_B^2, and this universality is spoiled
neither by realistic values of the m_X cut nor by alpha_s corrections. Both the
differential decay rate and forward-backward asymmetry with an m_X cut are
computed.


title: A minimal supersymmetric scenario with only \mu at the weak scale

abstract:
  Inspired by split supersymmetry, we study a minimal supersymmetric scenario
with only the Higgsino mass parameter $\mu$ below the TeV scale. The motivation
is to satisfy the gauge coupling unification and dark matter constraints with
the minimal particle contents at the electroweak scale in supersymmetric
models. With the neutral Higgsino as the lightest supersymmetric particle, we
discuss the dark matter signals in both direct and indirect detection. We also
discuss collider phenomenology associated with the two lightest neutralinos and
the lightest chargino, which are almost degenerate in mass even after taking
into account radiative corrections. Unfortunately, the collider signals may be
very difficult for identifying such a scenario because the pions or leptons in
the final state are too soft.


title:
Anomalous gauge couplings of the Higgs boson at high energy photon
  colliders

abstract:
  We study the sensitivity of testing the anomalous gauge couplings $g_{HVV}$'s
of the Higgs boson in the formulation of linearly realized gauge symmetry via
the processes $\gamma\gamma\to ZZ$ and $\gamma\gamma\to WWWW$ at polarized and
unpolarized photon colliders based on $e^+e^-$ linear colliders of
c.m.~energies 500 GeV, 1 TeV, and 3 TeV. Signals beyond the standard model (SM)
and SM backgrounds are carefully studied. We propose certain kinematic cuts to
suppress the standard model backgrounds. For an integrated luminosity of 1
ab$^{-1}$, we show that (a) $\gamma\gamma\to ZZ$ can provide a test of
$g_{H\gamma\gamma}$ to the $3\sigma$ sensitivity of $O(10^{-3}-10^{-2})$
TeV$^{-1}$ at a 500 GeV ILC, and $O(10^{-3})$ TeV$^{-1}$ at a 1 TeV ILC and a 3
TeV CLIC, and (b) $\gamma\gamma\to WWWW$ at a 3 TeV CLIC can test all the
anomalous couplings $g_{HVV}$'s to the $3\sigma$ sensitivity of
$O(10^{-3}-10^{-2})$ TeV$^{-1}$.


title: J/psi Photo-production at Large z in Soft Collinear Effective Theory

abstract:
  One of the outstanding problems in J/\psi physics is a systematic
understanding of the differential photo-production cross section
dsigma/dz(gamma + p -> J/psi + X), where z= E_psi/E_gamma in the proton rest
frame. The theoretical prediction based on the non-relativistic QCD (NRQCD)
factorization formalism has a color-octet contribution which grows rapidly in
the endpoint region, z -> 1, spoiling perturbation theory. In addition there
are subleading operators which are enhanced by powers of 1/(1-z) and they must
be resummed to all orders. Here an update of a systematic analysis is
presented. The approach used to organize the endpoint behavior of the
photo-production cross section is based on a combination of NRQCD and soft
collinear effective theory. While a final result is not yet available, an
intermediate result indicates that better agreement between theory and data
will be achieved in this framework.


title:
Constraining non-standard interactions in nu_e e or bar{nu}_e e
  scattering

abstract:
  We present a new analysis of non-universal and flavor changing non-standard
neutrino interactions (NSI) in \nu_e e or \bar{\nu}_e e scattering. Our global
analysis of these process includes all relevant experiments, such as the most
recent MUNU measurement from reactor neutrinos, both in the context of the
Standard Model as well as extensions where NSI are present. We also compare our
constraints on non-universal and flavor changing NSI with results from previous
analyses. We stress the importance of combining neutrino and anti-neutrino data
in the resulting constraints on electroweak paramaters, and the important role
that future low energy solar neutrino experiments can play in improving
existing sensitivities.


title: On meson masses

abstract:
  It is shown that in the framework of analytical confinement, when quark and
gluon propagators are induced by an vacuum selfdual gluon field with constant
strength, the masses of meson with quantum numbers $Q=J^P$ and quark
constituents $m_1,~m_2$ are described with reasonable accuracy by the formula
$$ M_Q(m_1,m_2)=(m_1+m_2)[1+{A_Q\over (m_1^2+1.13m_1m_2+m_2^2)^{0.625}}],$$
where a constant positive parameter $A_Q$ is unique for all mesons with quantum
numbers $Q=J^P$. Sets of mesons $J^P=0^-,~1^-,~0^+,~1^+,~2^+,~3^-$ and
different flavors constituent quarks $(u=d,~s,~,c~,b)$ are considered.


title: Long life stau in the minimal supersymmetric standard model

abstract:
  We study the stau lifetime in a scenario with the LSP taken to be a
neutralino and the NLSP being a stau, based on the minimal supersymmetric
Standard Model. The mass difference between the LSP and NLSP, $\delta m$, must
satisfy $\delta m/m_{\tilde{\chi}} \sim$ a few % or less for coannihilation to
occur, where $m_{\tilde{\chi}}$ is the neutralino mass. We calculate the stau
lifetime from the decay modes $\tilde{\tau}\to \tilde{\chi}\tau$,
$\tilde{\chi}\nu_\tau\pi$, and $\tilde{\chi}\nu_\tau\mu(e)\nu_{\mu(e)}$ and
discuss its dependence on various parameters. We find that the lifetime is in
the range $10^{-22}$--$10^{16}$ sec for $10^{-2} \le \delta m \le 10$ GeV. We
also discuss the connection with lepton flavor violation if there is mixing
between sleptons.


title: Color Superconductivity in High Density QCD

abstract:
  We describe the effects of the strange quark mass and of color and electric
neutrality on the superconducing phases of QCD. We discuss various phases
pointing out the corresponding problems, typically arising from a
chromomagnetic instability. We show that, at least for particular
configurations, the LOFF phase dominates over the gCFL phase, when close to the
transition from gCFL to the normal phase.


title: Diffractive scattering at high energies

abstract:
  In this work we analyse applicability of regge-based models to hadron
interactions. Commonly-used extensions of pure regge model are found to be
failed. Low constituent model is inroduced and found to be consistent with
hadron-hadron and hadron-photon data.


title: Electromagnetic Signals at RHIC

abstract:
  We calculate the direct photon yield in central and mid-peripheral Au+Au
collisions at the Relativistic Heavy-Ion Collider (RHIC). The processes
involving the propagation of jets have been convolved with a leading order
treatment of jet energy loss in the medium and a one dimensional hydrodynamic
expansion. The quark-gluon plasma (QGP) contribution turns out to be important,
especially the in-medium conversion of a jet into a photon, for successfully
describing recent photon measurements.


title: Generalized parton distributions: recent results

abstract:
  I review progress on selected issues connected with generalized parton
distributions. Topics range from the description of hard exclusive reactions to
the spatial distribution of quarks in the nucleon and the contribution of their
orbital angular momentum to the nucleon spin.


title:
Neutrino Masses with Inverse Hierarchy from Broken L_e-L_\mu-L_\tau: a
  Reappraisal

abstract:
  We discuss a class of models of neutrino masses and mixings with inverse
hierarchy based on a broken U(1)_F flavour symmetry with charge
L_e-L_\mu-L_\tau for lepton doublets and arbitrary right-handed charges. The
symmetry breaking sector receives separate contributions from flavon vev
breaking terms and from soft mass breaking in the right handed Majorana sector.
The model is able to reproduce in a natural way all observed features of the
charged lepton mass spectrum and of neutrino masses and mixings (even with
arbitrarily small \theta_{13}), with the exception of a moderate fine tuning
which is needed to accomodate the observed small value of r = Delta m^2_{sol} /
Delta m^2_{atm}.


title: Vortices in gauge models at finite density with vector condensates

abstract:
  There exists a class of gauge models incorporating a finite density of matter
in which the Higgs mechanism is provided by condensates of gauge (or gauge and
scalar) fields, i.e., there are vector condensates in this case. We describe
vortex solutions in the simplest model in this class, the gauged $SU(2)\times
U(1)_Y$ $\sigma$-model with the chemical potential for hypercharge $Y$, in
which the gauge symmetry is completely broken. It is shown that there are three
types of topologically stable vortices in the model, connected either with
photon field or hypercharge gauge field, or with both of them. Explicit vortex
solutions are numerically found and their energy per unit length are
calculated. The relevance of these solutions for the gluonic phase in the dense
two-flavor QCD is discussed.


title: Constraining Dark Matter in the MSSM at the LHC

abstract:
  In the event that R-Parity conserving supersymmetry (SUSY) is discovered at
the LHC, a key issue which will need to be addressed will be the consistency of
that signal with astrophysical and non-accelerator constraints on SUSY Dark
Matter. This issue is studied for the SPA benchmark model based on measurements
of end-points and thresholds in the invariant mass spectra of various
combinations of leptons and jets. These measurements are used to constrain the
soft SUSY breaking parameters at the electroweak scale in a general MSSM model.
Based on these constraints, we assess the accuracy with which the Dark Matter
relic density can be measured.


title: New Method for Reconstructing Effective Top Quark Spin

abstract:
  We propose a new method for reconstructing an effective spin direction of a
semi-leptonically decayed top quark. The method is simple: for instance, it
does not require the spin information of the antitop quark in a ttbar event.
The reconstructed effective spin is expected to be useful in hadron collider
experiments. We demonstrate its usefulness in an analysis of the top decay
vertex.


title: Pomeron loops in zero transverse dimensions

abstract:
  We analyze a toy model which has a structure similar to that of the recently
found QCD evolution equations, but without transverse dimensions. We develop
two different but equivalent methods in order to compute the leading-order and
next-to-leading order Pomeron loop diagrams. In addition to the leading-order
result which has been derived from Mueller's toy model~\cite% {Mueller:1994gb},
we can also calculate the next-to-leading order contribution which provides the
$(\alpha_{s}^{2}\alpha Y)$ correction. We interpret this result and discuss its
possible implications for the four-dimensional QCD evolution.


title: Diquark Correlations from Nucleon Charge Radii

abstract:
  We argue that precise measurements of charge and magnetic radii can
meaningfully constrain diquark models of the nucleon. We construct properly
symmetrized, nonrelativistic three-quark wave functions that interpolate
between the limits of a pointlike diquark pair and no diquark correlation. We
find that good fits to the data can be obtained for a wide range of diquark
sizes, provided that the diquark wave functions are close to those that reduce
to a purely scalar state in the pointlike limit. A modest improvement in the
experimental uncertainties will render a fit to the charge radii a more telling
diagnostic for the presence of spatially correlated quark pairs within the
nucleon.


title:
Toward a NNLO calculation of the B-->X_s gamma decay rate with a cut on
  photon energy: I. Two-loop result for the soft function

abstract:
  A theoretical analysis of the partial inclusive B-->X_s gamma decay rate with
a cut E_gamma>E_0 on photon energy must deal with short-distance contributions
associated with three different mass scales: the hard scale m_b, an
intermediate scale \sqrt{m_b Delta}, and a soft scale Delta, where
Delta=m_b-2E_0=1GeV for E_0=1.8GeV. The cut-dependent effects are described in
terms of two perturbative objects called the jet function and the soft
function, which for a next-to-next-to-leading order analysis of the decay rate
are required with two-loop accuracy. The two-loop calculation of the soft
function is presented here, while that of the jet function will be described in
a subsequent paper. As a by-product, we rederive the two-loop
anomalous-dimension kernel of the B-meson shape function.


title: An analytic method of describing $R$-related quantities in QCD

abstract:
  A model based on the analytic approach to QCD, involving a summation of
threshold singularities and taking into account the nonperturbative character
of the light quark masses, is applied to find hadronic contributions to
different physical quantities. It is shown that the suggested model allows us
to describe well such objects as the hadronic contribution to the anomalous
magnetic moment of the muon, the ratio of hadronic to leptonic $\tau$-decay
widths in the vector channel, the Adler $D$-function, the smeared
$R_\Delta$-function, and the hadronic contribution to the evolution of the fine
structure constant.


title: Dispelling the N^3 myth for the Kt jet-finder

abstract:
  At high-energy colliders, jets of hadrons are the observable counterparts of
the perturbative concepts of quarks and gluons. Good procedures for identifying
jets are central to experimental analyses and comparisons with theory. The Kt
family of successive recombination jet finders has been widely advocated
because of its conceptual simplicity and flexibility and its unique ability to
approximately reconstruct the partonic branching sequence in an event. Until
now however, it had been believed that for an ensemble of N particles the
algorithmic complexity of the Kt jet finder scaled as N^3, a severe issue in
the high multiplicity environments of LHC and heavy-ion colliders. We here show
that the computationally complex part of Kt jet-clustering can be reduced to
two-dimensional nearest neighbour location for a dynamic set of points.
Borrowing techniques developed for this extensively studied problem in
computational geometry, Kt jet-finding can then be performed in N ln N time.
Code based on these ideas is found to run faster than all other jet finders in
current use.


title: Solving Flavor Puzzles with Quiver Gauge Theories

abstract:
  We consider a large class of models where the SU(5) gauge symmetry and a
Froggatt-Nielsen (FN) Abelian flavor symmetry arise from a U(5)\times U(5)
quiver gauge theory. An intriguing feature of these models is a relation
between the gauge representation and the horizontal charge, leading to a
restricted set of possible FN charges. Requiring that quark masses are
hierarchical, the lepton flavor structure is uniquely determined. In
particular, neutrino mass anarchy is predicted.


title: A QCD sum rule study of the light scalar mesons

abstract:
  We examine the interpretation of the light scalar meson nonet as bound states
of the scalar diquark and the scalar antidiquark using the QCD sum rule
approach. Our results are obtained by means of the operator product expansion
(OPE) including operators up to dimension 8. They show no evidence of the
coupling of the tetraquark states to the light scalar meson nonet.


title: Dijet rates with symmetric $E_T$ cuts

abstract:
  We discuss the physics underlying an all-order resummation of logarithmic
enhanced contributions to dijet cross sections, and present preliminary results
for the distribution in the dijet transverse energy difference in DIS.


title: 0^-+ Trigluon Glueball and its Implication for a Recent BES Observation

abstract:
  We calculate the mass of $0^{-+}$ triple-valence-gluon resonance, the
trigluon glueball, with QCD sum rules. Its mass is found to be approximately in
the region between 1.9 GeV and 2.7 GeV with some theoretical uncertainties.
Moreover, it is likely that the new BES measurement of the $p \bar{p}$
enhancement near threshold in the $J/\psi$ decays exhibits the behavior of this
trigluon state. Our analyzes favor the baryonium-gluonium mixing picture for
the BES observation.


title: Neutrino Oscillations and Time-Energy Uncertainty Relation

abstract:
  Neutrino oscillations is a phenomenon which is characterized by a finite
oscillation time (length). For such phenomena time-energy uncertainty relation
is valid. This means that energy uncertainty is needed for oscillations to
occur. We consider neutrino oscillations from this point of view. We
demonstrate that for mixed neutrino states, which describe flavor neutrinos
$\nu_{e}$, $\nu_{\mu}$ and $\nu_{\tau}$, translational invariance does not take
place.


title: Quantization and High Energy Unitarity in Orbifold Theories

abstract:
  We study five-dimensional Yang-Mills theories compactified on an S^1/Z_2
orbifold. The fundamental Lagrangian naturally includes brane kinetic terms at
the orbifold fixed points which are induced by quantum corrections of the bulk
fields. The theories are quantized in the higher-dimensional R_xi gauges before
compactification. Using Ward and Slavnov-Taylor identities, an all-order proof
of a generalized equivalence theorem is presented. The theorem relates
scattering amplitudes of longitudinal Kaluza-Klein gauge bosons to amplitudes
of the corresponding scalar modes. Non-trivial sum rules among the fundamental
couplings of the 4D effective theory lie at the heart of high energy unitarity
cancellations. Using a novel coupled channel analysis, we derive an upper bound
on the number of Kaluza-Klein modes from perturbative unitarity. The bound
shows a very weak dependence on the size of the brane kinetic terms.


title: Colour Deconfinement and Quarkonium Binding

abstract:
  At high temperatures, strongly interacting matter becomes a plasma of
deconfined quarks and gluons. In statistical QCD, deconfinement and the
properties of the resulting quark-gluon plasma can be investigated by studying
the in-medium behaviour of heavy quark bound states. In high energy nuclear
interactions, quarkonia probe different aspects of the medium formed in the
collision. We survey the results of recent charmonium production studies in SPS
and RHIC experiments.


title: Phase diagram of neutral quark matter in nonlocal chiral quark models

abstract:
  We consider the phase diagram of two-flavor quark matter under neutron star
constraints for two nonlocal, covariant quark models within the mean field
approximation. In the first case (Model I) the nonlocality arises from the
regularization procedure, motivated by the instanton liquid model, whereas in
the second one (Model II) a separable approximation of the one-gluon exchange
interaction is applied. We find that Model II predicts a larger quark mass gap
and a chiral symmetry breaking (CSB) phase transition line which extends 15-20%
further into the phase diagram spanned by temperature (T) and chemical
potential (mu). The corresponding critical temperature at mu=0, T_c(0)~140 MeV,
is in better accordance to recent lattice QCD results than the prediction of
the standard local NJL model, which exceeds 200 MeV. For both Model I and Model
II we have considered various coupling strengths in the scalar diquark channel,
showing that different low-temperature quark matter phases can occur at
intermediate densities: a normal quark matter (NQM) phase, a two-flavor
superconducting (2SC) quark matter phase and a mixed 2SC-NQM phase. Although in
most cases there is also a gapless 2SC phase, this occurs in general in a small
region at nonzero temperatures, thus its effect should be negligible for
compact star applications.


title:
Boson-boson scattering and Higgs production at the LHC from a six
  fermion point of view: four jets + l$\nu$ processes at $\O(\alpha_{em}^6)$

abstract:
  Boson-boson scattering and Higgs production in boson-boson fusion hold the
key to electroweak symmetry breaking. In order to analyze these essential
features of the Standard Model we have performed a partonic level study of all
processes $q_1 q_2 \to q_3 q_4 q_5 q_6 l \nu$ at the LHC using the exact matrix
elements at $\O(\alpha_{em}^6)$ provided by \Phase, a new MC generator. These
processes include also three boson production and the purely electroweak
contribution to \toptop production as well as all irreducible backgrounds.
Kinematical cuts have been studied in order to enhance the VV scattering signal
over background. \Phase has been compared with different Monte Carlo's showing
that a complete calculation is necessary for a correct description of the
process.


title:
Ultra-High Energy Neutrino-Nucleon Scattering and Parton Distributions
  at Small $x$

abstract:
  The cross section for ultra-high energy neutrino-nucleon scattering is very
sensitive to the parton distributions at very small values of Bjorken x ($x
\leq 10^{-4})$. We numerically investigate the effects of modifying the
behavior of the gluon distribution function at very small $x$ in the DGLAP
evolution equation. We then use the Color Glass Condensate formalism to
calculate the neutrino-nucleon cross section at ultra-high energies and compare
the result with those based on modification of DGLAP evolution equation.


title: D-term Inflation and Leptogenesis by Right-handed Sneutrino

abstract:
  We discuss a D-term inflation scenario where a right-handed sneutrino can be
an inflaton field leading to a viable inflation and leptogenesis, with a
minimal form of K\"ahler potential. The decay of an inflaton sneutrino can
non-thermally create large enough lepton asymmetry. Its entropy production is
also big enough to ameliorate the gravitino problem caused by too high a
reheating temperature from the decay of a symmetry breaking field.


title: Effective Field Theory and Heavy Quark Physics

abstract:
  These notes are based on five lectures presented at the 2004 Theoretical
Advanced Study Institute (TASI) on ``Physics in D>=4''. After a brief
motivation of flavor physics, they provide a pedagogical introduction to
effective field theory, the effective weak Lagrangian, and the technology of
renormalization-group improved perturbation theory. These general methods are
then applied in the context of heavy-quarks physics, introducing the concepts
of heavy-quark and soft-collinear effective theory.


title: Higgs boson with a single generation in the bulk

abstract:
  We study Higgs boson properties in a model where three fermionic families of
the Standard Model arise from a single generation in (5+1) dimensions. We
demonstrate that, in spite of a non-trivial background, properties of the
four-dimensional Higgs particle are almost indistinguishable from those in the
Standard Model. We also argue that it is more natural to have a light Higgs
boson in this model.


title: MSGUT : From Bloom to Doom

abstract:
  By a systematic survey of the parameter space we confirm our
surmise\cite{gmblm} that the Minimal Supersymmetric GUT(MSGUT) based on the
${\bf{210\oplus 126\oplus {\bar {126}}\oplus 10}}$ Higgs system is incompatible
with the generic Type I and Type II seesaw mechanisms. The incompatibility of
the Type II seesaw mechanism with this MSGUT is due to its generic extreme
sub-dominance with respect to the Type I contribution. The Type I mechanism
although dominant over Type II is itself unable to provide Neutrino masses
larger than $ \sim 10^{-3}$ eV anywhere in the parameter space. Our
Renormalization Group based analysis shows the origin of these difficulties to
lie in a conflict between baryon stability and neutrino oscillation. The MSGUT
completed with a {\bf{120}}-plet Higgs is the natural next to minimal
candidate. We propose a scenario where the {\bf{120}}-plet collaborates with
the {\bf{10}}-plet to fit the charged fermion masses. The freed
{{\bf{126}}}-plet couplings can then give sub-dominant contributions to charged
fermion masses {\textit{and}} enhance the Type I seesaw masses sufficiently to
provide a viable seesaw mechanism. We give formulae required to verify this
scenario.


title:
Tachyon dynamics of the black disc limit in the hard small $x$ processes
  in QCD

abstract:
  We investigate the effective field theory (EFT) which gives the approximate
description of the scattering of the two hard small dipoles in the small $x$
processes in QCD near the black disc limit(BDL). We argue that the perturbative
QCD approaches predict the existence of tachyon and visualize it in the
approximation where $\alpha'_P=0$ . We demonstrate that the high energy
behavior of the cross-section depends strongly on the diffusion law in the
impact parameter plane. On the other hand, almost threshold behavior of the
cross section of the hard processes and multiplicities, i.e. fast increase of
cross sections (color inflation), melting of ladders into color network and
softening of the longitudinal distributions of hadrons are qualitatively
insensitive to the value of diffusion in the impact parameter space. We
evaluate $\alpha'_P$ near the black disk limit and find significant $\alpha'_P$
as the consequence of the probability conservation.


title:
Phase diagrams of the three-flavor NJL model with color
  superconductivity and pseudoscalar condensation

abstract:
  We present results of the calculation of phase diagrams of the three-flavor
NJL model as a function of temperature and different quark chemical potentials.
These phase diagrams are an extension of earlier calculations in the literature
in which either only the possibility of color superconductivity or the
possibility of pseudoscalar condensation was investigated. This study takes
into account both options and hence allows one to investigate their
competition. It turns out that the color superconducting phase and the phase in
which the pseudoscalar mesons condense are separated by a first order
transition.


title:
Supersymmetric Thermalization and Quasi-Thermal Universe: Consequences
  for Gravitinos and Leptogenesis

abstract:
  Motivated by our earlier paper \cite{am}, we discuss how the infamous
gravitino problem has a natural built in solution within supersymmetry.
Supersymmetry allows a large number of flat directions made up of {\it gauge
invariant} combinations of squarks and sleptons. Out of many at least {\it one}
generically obtains a large vacuum expectation value during inflation. Gauge
bosons and Gauginos then obtain large masses by virtue of the Higgs mechanism.
This makes the rate of thermalization after the end of inflation very small and
as a result the Universe enters a {\it quasi-thermal phase} after the inflaton
has completely decayed. A full thermal equilibrium is generically established
much later on when the flat direction expectation value has substantially
decareased. This results in low reheat temperatures, i.e., $T_{\rm R}\sim {\cal
O}({\rm TeV})$, which are compatible with the stringent bounds arising from the
big bang nucleosynthesis. There are two very important implications: the
production of gravitinos and generation of a baryonic asymmetry via
leptogenesis during the quasi-thermal phase. In both the cases the abundances
depend not only on an effective temperature of the quasi-thermal phase (which
could be higher, i.e., $T\gg T_{\rm R}$), but also on the state of equilibrium
in the reheat plasma. We show that there is no ``thermal gravitino problem'' at
all within supersymmetry and we stress on a need of a new paradigm based on a
``quasi-thermal leptogenesis'', because in the bulk of the parameter space the
{\it old} thermal leptogenesis cannot account for the observed baryon
asymmetry.


title: Low-x physics and W and Z production at the LHC

abstract:
  W and Z production at the LHC occur at small Bjorken x, and are thus subject
to the theoretical uncertainties of low-x physics. The implications of this for
the PDF uncertainties on W and Z production are discussed, including the
limitations this puts on their usefulness as luminosity monitors. The
possibility of using LHC measurements to improve PDF uncertainties is
discussed. Measurement of the W lepton decay spectra can improve the gluon
PDFs, whereas measurement of the lepton asymmetry can give new information on
valence distributions at small x.


title: Generalized parton distributions from nucleon form factors

abstract:
  Results from a recent analysis of the zero-skewness generalized parton
distributions (GPDs) for valence quarks are reviewed. The analysis bases on a
physically motivated parameterization of the GPDs with a few free parameters
adjusted to the nucleon form factor data. The Fourier transforms of the GPDs
representing quark densities in the impact parameter plane, as well as moments
of the GPDs are also discussed. The 1/x moments in particular form the soft
physics input to Compton scattering off protons within the handbag approach.
The Compton cross section evaluated from this information is found to be in
good agreement with experiment.


title: Masses of heavy tetraquarks in the relativistic quark model

abstract:
  The masses of heavy tetraquarks with hidden charm and bottom are calculated
in the framework of the relativistic quark model. The tetraquark is considered
as the bound state of a heavy-light diquark and antidiquark. The light quark in
a heavy-light diquark is treated completely relativistically. The internal
structure of the diquark is taken into account by calculating the diquark-gluon
form factor in terms of the diquark wave functions. New experimental data on
charmonium-like states above open charm threshold are discussed. The obtained
results indicate that the X(3872) can be the tetraquark state with hidden
charm. The masses of ground state tetraquarks with hidden bottom are found to
be below the open bottom threshold.


title: Upper Bounds on Rare K and B Decays from MFV

abstract:
  Recently, we studied the branching ratios of rare K and B decays in models
with Minimal Flavor Violation (MFV) using the presently available information
from the universal unitarity triangle analysis and from the measurements of
Br(B -> Xs gamma), Br(B -> Xs l+l-) and Br(K+ -> pi+ nu nubar). We analyzed in
detail possible scenarios with positive or negative interference of Standard
Model (SM) and New Physics contributions. In particular, we derived upper
bounds on various rare decays and pointed out an interesting triple correlation
between B -> Xs gamma, B -> Xs l+l- and K+ -> pi+ nu nubar present in MFV
models.


title: Higgs Boson Search at e+e- and Photon Linear Colliders

abstract:
  The various search modes for the Higgs bosons of the Standard Model (SM) and
its Minimal Supersymmetric Extension (MSSM) at the International Linear
Collider (ILC) will be summarized briefly. In particular, as a unique discovery
mode the production of heavy neutral MSSM Higgs bosons for medium values of
$\tan\beta$ in photon collisions will be presented. Furthermore, $\tau^+\tau^-$
fusion into MSSM Higgs bosons in the photon mode will be shown to give access
to the mixing parameter $\tan\beta$ with a precision of better than 10% for
large values of this parameter.


title: Finite volume effects in a quenched lattice-QCD quark propagator

abstract:
  We investigate finite volume effects in the pattern of chiral symmetry
breaking. To this end we employ a formulation of the Schwinger-Dyson equations
on a torus which reproduces results from the corresponding lattice simulations
of staggered quarks and from the overlap action. Studying the volume dependence
of the quark propagator we find quantitative differences with the infinite
volume result at small momenta and small quark masses. We estimate the minimal
box length L below which chiral perturbation theory cannot be applied to be L
\simeq 1.6 fm. In the infinite volume limit we find a chiral condensate of
|<\bar{q}q>|_{\bar{MS}}^{2 GeV} = (253 \pm 5.0 MeV)^3, an up/down quark mass of
m_{\bar{MS}}^{2 GeV} = 4.1 \pm 0.3 MeV and a pion decay constant which is only
ten percent smaller than the experimental value.


title:
Constraining Mass Spectra with Sterile Neutrinos from Neutrinoless
  Double Beta Decay, Tritium Beta Decay and Cosmology

abstract:
  We analyze the constraints on neutrino mass spectra with extra sterile
neutrinos as implied by the LSND experiment. The various mass related
observables in neutrinoless double beta decay, tritium beta decay and cosmology
are discussed. Both neutrino oscillation results as well as recent cosmological
neutrino mass bounds are taken into account. We find that some of the allowed
mass patterns are severely restricted by the current constraints, in particular
by the cosmological constraints on the total sum of neutrino masses and by the
non-maximality of the solar neutrino mixing angle. Furthermore, we estimate the
form of the four neutrino mass matrices and also comment on the situation in
scenarios with two additional sterile neutrinos.


title: About earlier history of two--photon physics

abstract: The earlier history of two--photon physics is reviewed.


title:
Inclusive Hadronic Distributions Inside One Jet at High Energy Colliders
  at "Modified Leading Logarithmic Approximation" of Quantum Chromodynamics

abstract:
  After demonstrating their general expressions valid at all x, double
differential 1-particle inclusive distributions inside a quark and a gluon jet
produced in a hard process, together with the inclusive k-transverse
distributions, are calculated at small x in the Modified Leading Logarithmic
Approximation (MLLA), as functions of the transverse momentum of the outgoing
hadron. Results are compared with the Double Logarithmic Approximation (DLA)
and a naive DLA-inspired evaluation; sizable corrections are exhibited which,
associated with the requirement to stay in a perturbative regime, set the
limits of the interval where our calculations can be trusted. We give
predications for the LHC and Tevatron colliders.


title: Perturbatively Stable Resummed Small x Evolution Kernels

abstract:
  We present a small x resummation for the GLAP anomalous dimension and its
corresponding dual BFKL kernel, which includes all the available perturbative
information and nonperturbative constraints. Specifically, it includes all the
information coming from next-to-leading order GLAP anomalous dimensions and
BFKL kernels, from the constraints of momentum conservation, from
renormalization-group improvement of the running coupling and from gluon
interchange symmetry. The ensuing evolution kernel has a uniformly stable
perturbative expansion. It is very close to the unresummed NLO GLAP kernel in
most of the HERA kinematic region, the small x BFKL behaviour being softened by
momentum conservation and the running of the coupling. Next-to-leading
corrections are small thanks to the constraint of gluon interchange symmetry.
This result subsumes all previous resummations in that it combines optimally
all the information contained in them.


title: Photon Structure Functions: 1978 AND 2005

abstract:
  I describe the early days of the photon structure functions. In particular I
discuss the parton model result of Walsh and Zerwas (1973), leading order QCD
calculation of Witten (1976) and next-to-leading QCD calculation of Bardeen and
myself (1978). A very brief summary of the progress made from 1978 until 2005
is also given.


title: Sequential charmonium dissociation

abstract:
  Finite temperature lattice QCD indicates that the charmonium ground state
J/psi can survive in a quark-gluon plasma up to 1.5 T_c or more, while the
excited states chi_c and psi-prime are dissociated just above T_c. We assume
that the chi_c suffers the same form of suppression as that observed for the
psi-prime in SPS experiments, and that the directly produced J/psi is
unaffected at presently available energy densities. This provides a
parameter-free description of J/psi and psi-prime suppression which agrees
quite well with that observed in SPS and RHIC data.


title: Geometric approach to condensates in holographic QCD

abstract:
  An SU(Nf)xSU(Nf) Yang-Mills theory on an extra-dimensional interval is
considered, with appropriate symmetry-breaking boundary conditions on the IR
brane. UV-brane to UV-brane correlators at high energies are compared with the
OPE of two-point functions of QCD quark currents. Condensates correspond to
departure from AdS of the (different) metrics felt by vector and axial
combinations, away from the UV brane. Their effect on hadronic observables is
studied: the extracted condensates agree with the signs and orders of magnitude
expected from QCD.


title: Chiral phase transition in effective models of QCD

abstract:
  Incorporating its most relevant global symmetry, chiral effective models are
aimed at investigating, in a simplified framework, important aspects of the yet
unsolved QCD. We review some recent results obtained in these models on the
restoration of chiral and axial symmetries, on the boundary of the first order
phase transition region in the m_pi-m_K-plane at vanishing baryonic chemical
potential mu_B,and on the mu_B-T phase diagram.


title: Spin-dependent interaction in the deconfined phase of QCD

abstract:
  Spin-dependent deconfined interaction in the Q\barQ system is derived from
the field correlators known from lattice and analytic calculations. As a result
hyperfine splitting is found numerically for charmonium, bottomonium and
strangeonium in the range T_c<T<2T_c. Spin-orbit interaction due to magnetic
correlators (the Thomas term) is able to produce numerous Q\barQ bound states
with accumulation point at M=m_Q+m_\barQ. Possible influence of these effects
on the thermodynamics of quark-gluon plasma is discussed.


title: Kaluza-Klein states at the LHC in models with localized fermions

abstract:
  We give a brief review of some aspects of physics with TeV size
extra-dimensions. We focus on a minimal model with matter localized at the
boundaries for the study of the production of Kaluza-Klein excitations of gauge
bosons. We briefly discuss different ways to depart from this simple analysis.


title:
Chiral Effective-Field Theory in the Delta(1232) Region: Pion
  Electroproduction on the Nucleon

abstract:
  We develop an extension of chiral perturbation theory to the
$\Delta$(1232)-resonance energy region and apply it to investigate the pion
electroproduction off the nucleon ($e^- N \to e^- N\pi$). We present a complete
calculation of this process, in the $\Delta$-resonance region, up to
next-to-leading order in the {\it $\delta$-expansion}. At this order, the only
free parameters are the three low-energy constants corresponding to the
magnetic (M1), electric (E2), and Coulomb (C2) $\gamma N \to \Delta $
transition strength. After fitting these parameters to a few well-known data,
our calculation provides a prediction for observables and multipole amplitudes
of pion electroproduction. These results compare favorably with the
phenomenological multipole solutions and recent experimental results from
MIT-Bates and MAMI. Our prediction for the pion-mass dependence of the $\gamma
N\Delta$ form factors offers an explanation for the discrepancy between the
recent lattice-QCD results and the experimental value for the "C2/M1 ratio" at
low $Q^2$.


title: Beta-functions for a SU(2) Matrix Model in 2 + epsilon Dimensions

abstract:
  To investigate the non-perturbative, electric sector of a deconfined gauge
theory at nonzero temperature, we consider a SU(2) matrix model. We compute
beta-functions to one loop order for the simplest extension of the O(4)
nonlinear sigma model, which involves three coupling constants. Computing in
the ultraviolet limit in 2 + epsilon dimensions, we find that at least one
coupling is not asymptotically free.


title:
Towards a precise measurement of the top quark Yukawa coupling at the
  ILC

abstract:
  A precise measurement of the top quark Yukawa coupling is of great
importance, since it may shed light on the mechanism of EWSB. We study the
prospects of such measurement during the first phase of the ILC at sqrt(s)=500
GeV, focusing in particular on recent theoretical developments as well as the
potential benefits of beam polarization. It is shown that both yield
improvements that could possibly lead to a measurement competitive with the
LHC.


title: Renormalization Scale-Fixing for Complex Scattering Amplitudes

abstract:
  We show how to fix the renormalization scale for hard-scattering exclusive
processes such as deeply virtual meson electroproduction by applying the BLM
prescription to the imaginary part of the scattering amplitude and employing a
fixed-t dispersion relation to obtain the scale-fixed real part. In this way we
resolve the ambiguity in BLM renormalization scale-setting for complex
scattering amplitudes. We illustrate this by computing the H generalized parton
distribution at leading twist in an analytic quark-diquark model for the
parton-proton scattering amplitude which can incorporate Regge exchange
contributions characteristic of the deep inelastic structure functions.


title:
Evaluation of the coincidence probabilities in a generalized Gaussian
  model of multiple particle production

abstract:
  Coincidence probabilities, which yield Renyi entropies, are investigated in a
generalized Gaussian model, which includes interparticle correlations


title: On Sudakov and Soft resummations in QCD

abstract:
  In this article we extract soft distribution functions for Drell-Yan and
Higgs production processes using mass factorisation theorem and the
perturbative results that are known upto three loop level. We find that they
are maximally non-abelien. We show that these functions satisfy Sudakov type
integro differential equations. The formal solutions to such equations and also
to the mass factorisation kernel upto four loop level are presented. Using the
soft distribution function extracted from Drell-Yan production, we show how the
soft plus virtual cross section for the Higgs production can be obtained. We
determine the threshold resummation exponents upto three loop using the soft
distribution function.


title: Single-top production in MC@NLO

abstract:
  We match next-to-leading order QCD results for single-top hadroproduction
with parton shower Monte Carlo simulations, according to the prescription of
the MC@NLO formalism. In this way, we achieve the first practical
implementation in MC@NLO of a process that has both initial- and final-state
collinear singularities. We show that no difficulties of principle arise from
this complication, and present selected results relevant to the Tevatron.


title: QCD Predictions for Charm and Bottom Production at RHIC

abstract:
  We present up-to-date QCD predictions for open charm and bottom production at
RHIC in nucleon-nucleon collisions at \sqrt{S} = 200 GeV. The electron spectrum
resulting from heavy flavor decays is also evaluated for direct comparison to
the PHENIX and STAR data. These predictions seek to establish a rigorous
benchmark, including the theoretical uncertainties, against which nuclear
collision data can be compared to obtain evidence for nuclear effects.


title: Universal 2-3 symmetry

abstract:
  Possible maximal mixing seen in the oscillations of the atmospheric neutrinos
has led to postulate of a $\mu$-$\tau$ symmetry which interchanges $\nu_\mu$
and $\nu_\tau$. We argue that such symmetry need not be special to neutrinos
but can be extended to all fermions. The assumption that all fermion mass
matrices are approximately invariant under interchange of the second and the
third generation fields is shown to be phenomenologically viable and has
interesting consequences. In the quark sector, the smallness of $V_{ub}$ and
$V_{cb}$ can be a consequences of this approximate 2-3 symmetry. The same
approximate symmetry can simultaneously lead to large atmospheric mixing angle
and can describe the leptonic mixing quite well provided the neutrino spectrum
is quasi degenerate. We present this scenario, elaborate on its consequences
and discuss its realization.


title: Highlights of the B-Physics Landscape

abstract:
  The exploration of the quark-flavour sector of the Standard Model is one of
the hot topics in particle physics of this decade. In these studies, which show
a fruitful interplay between theory and experiment, the B-meson system offers a
particularly interesting laboratory. After giving an introduction to
quark-flavour mixing and CP violation as well as to the theoretical tools to
deal with non-leptonic B decays, we discuss popular avenues for new physics to
enter the roadmap of quark-flavour physics. This allows us to have a detailed
look at the B-factory benchmark modes $B^0_d\to J/\psi K_S$, $B^0_d\to \phi
K_S$ and $B^0_d\to\pi^+\pi^-$, with a particular emphasis of the impact of new
physics. We then perform an analysis of the $B\to\pi K$ puzzle, which may
indicate new sources of CP violation in the electroweak penguin sector, and
discuss its implications for rare B and K decays. The next topic is given by
$b\to d$ penguin processes, which are now starting to become accessible at the
B factories, thereby representing a new territory of the B-physics landscape.
Finally, we discuss the prospects for B-decay studies at the Large Hadron
Collider, where the $B^0_s$-meson system plays an outstanding role.


title:
Survival probability for exclusive central diffractive production of
  colorless states at the LHC

abstract:
  In this paper we discuss the survival probability for exclusive central
diffractive production of a colorless small size system at the LHC. This
process has a clear signature of two large rapidity gaps. Using the eikonal
approach for the description of soft interactions, we predict the value of the
survival probability to be about 5~6% for single channel models, while for a
two channel model the survival probability is about 3%. The dependence of the
survival probability factor (damping factor) on the transverse momenta of the
recoiled protons is discussed, and we suggest it be measured at the Tevatron so
as to minimize the possible ambiguity in the calculation of survival
probability at the LHC.


title: From factorization to its breaking in diffractive dijet production

abstract:
  When comparing recent experimental data from the H1 and ZEUS Collaborations
at HERA for diffractive dijet production in deep-inelastic scattering (DIS) and
photoproduction with next-to-leading order (NLO) QCD predictions using
diffractive parton densities, good agreement is found for DIS. However, the
dijet photoproduction data are overestimated by the NLO theory, showing that
factorization breaking occurs at this order. While this is expected
theoretically for resolved photoproduction, the fact that the data are better
described by a global suppression of direct and resolved contribution by about
a factor of two comes as a surprise. We therefore discuss in some detail the
factorization scheme and scale dependence between direct and resolved
contributions and propose a new factorization scheme for diffractive dijet
photoproduction.


title: QCD Tests of the Puzzling Scalar Mesons

abstract:
  Motivated by several recent data, we test the QCD spectral sum rules (QSSR)
predictions based on different proposals (\bar qq, \bar q\bar q qq, and
gluonium) for the nature of scalar mesons. In the I=1 and 1/2 channels, the
unusual (wrong) splitting between the a_0(980) and \kappa(900) and the a_0(980)
width can be understood from QSSR within a \bar qq assignement. However, none
of the \bar qq and \bar q\bar q qq results can explain the large \kappa width,
which may suggest that it can result from a strong interference with
non-resonant backgrounds. In the I=0 channel, QSSR and some low-energy theorems
(LET) require the existence of a low mass gluonium \sigma_B(1 GeV) coupled
strongly to Goldstone boson pairs which plays in the U(1)_V channel, a similar
role than the \eta' for the value of the U(1)_A topological charge. The
observed \sigma(600) and f_0(980) mesons result from a maximal mixing between
the gluonium \sigma_B and \bar qq(1 GeV) mesons, a mixing scheme which passes
several experimental tests. OZI violating J/\psi--> \phi\pi^+\pi^-, D_s--> 3\pi
decays and J/\psi--> \gamma S glueball filter processes may indicate that most
of the I=0 mesons above 1 GeV have important gluonium in their wave functions.
We expect that the f_0(1500), f_0(1710) and f_0(1790) have significant gluonium
component in their wave functions, while the f_0(1370) is mostly \bar qq. Tests
of these results can be provided by the measurements of the pure gluonium
\eta'\eta and 4\pi specific U(1)_A decay channels.


title:
Production and decays of supersymmetric Higgs bosons in spontaneously
  broken R-parity

abstract:
  We study the mass spectra, production and decay properties of the lightest
supersymmetric CP-even and CP-odd Higgs bosons in models with spontaneously
broken R-parity (SBRP). We compare the resulting mass spectra with expectations
of the Minimal Supersymmetric Standard Model (MSSM), stressing that the model
obeys the upper bound on the lightest CP-even Higgs boson mass. We discuss how
the presence of the additional scalar singlet states affects the Higgs
production cross sections, both for the Bjorken process and the "associated
production". The main phenomenological novelty with respect to the MSSM comes
from the fact that the spontaneous breaking of lepton number leads to the
existence of the majoron, denoted J, which opens new decay channels for
supersymmetric Higgs bosons. We find that the invisible decays of CP-even
Higgses can be dominant, while those of the CP-odd bosons may also be sizeable.


title: Enhanced electroweak penguin amplitude in B-->VV decays

abstract:
  We discuss a novel electromagnetic penguin contribution to the transverse
helicity amplitudes in B decays to two vector mesons, which is enhanced by two
powers of mB/Lambda relative to the standard penguin amplitudes. This leads to
unique polarization signatures in penguin-dominated decay modes such as B-->rho
K* similar to polarization effects in the radiative decay B-->K*gamma, and
offers new opportunities to probe the magnitude and chirality of
flavour-changing neutral current couplings to photons.


title: Asymptotic neutrino-nucleon cross section and saturation effects

abstract:
  In this paper we present a simple analytic expression for the (spin-averaged)
neutrino-nucleon cross section for ultra-high energies at twist-2, obtained as
the asymptotic limit of our previous findings. This expression gives values for
the cross section in remarkable numerical agreement with the previous numerical
evaluation in the energy region relevant for forthcoming neutrino experiments.
Moreover, we discuss the role and the relevance of saturation and recombination
effects in our approach, in comparison with other recent suggestions.


title: Supersymmetry Simulations with Off-Shell Effects for LHC and ILC

abstract:
  At the LHC and at an ILC, serious studies of new physics benefit from a
proper simulation of signals and backgrounds. Using supersymmetric sbottom pair
production as an example, we show how multi-particle final states are necessary
to properly describe off-shell effects induced by QCD, photon radiation, or by
intermediate on-shell states. To ensure the correctness of our findings we
compare in detail the implementation of the supersymmetric Lagrangian in
MadGraph, Sherpa and Whizard. As a future reference we give the numerical
results for several hundred cross sections for the production of supersymmetric
particles, checked with all three codes.


title:
Associate Higgs and Gauge Boson Production at Hadron Colliders in a
  Model with Vector Resonances

abstract:
  Motivated by new models of dynamical electroweak symmetry breaking that
predict a light composite higgs boson, we build an effective lagrangian which
describes the Standard Model (with a light Higgs) and vector resonances. We
compute the cross section for the associate production of a higgs and a gauge
boson. For some values of model parameters we find that the cross section is
significantly enhanced with respect to the Standard Model. This enhancement is
similar at the LHC and the Tevatron for the same range of resonance mass.


title: Improved Measurement of ttZ Couplings at the LHC

abstract:
  We consider QCD tt~Z production at the LHC with Z->\bar\nu\nu and
all-hadronic tt~ decays, i.e. pp -> p_T(miss)bb~+4 jets, as a tool to measure
ttZ couplings. This channel has a significantly larger cross section than those
where the Z boson decays leptonically. However, tt~, bb~+4 jet, tt~j and tt~jj
production give rise to potentially large backgrounds. We show that these
processes can be suppressed to an acceptable level with suitable cuts, and find
that adding the p_T(miss)bb~+4 jet channel to the final states used in previous
ttZ couplings analyses will improve the sensitivity by 10-60%. We also discuss
how the measurement of the ttZ couplings may constrain Little Higgs models.


title:
First Evidence for Neutrinoless Double Beta Decay - and World Status of
  Double Beta Experiments

abstract:
  The occurrence of the neutrinoless decay 0n-bb mode has fundamental
consequences: first total lepton number is not conserved, and second, the
neutrino is a Majorana particle. Further the effective mass measured allows to
put an absolute scale of the neutrino mass spectrum. In addition, double beta
experiments yield sharp restrictions also for other beyond standard model
physics. These include SUSY models, leptoquarks (leptoquark-Higgs
coupling),compositeness, left-right symmetric models (right-handed W boson
mass), test of special relativity and of the equivalence principle in the
neutrino sector and others. First evidence for neutrinoless double beta decay
was given in 2001, by the HEIDELBERG-MOSCOW experiment. The HEIDELBERG-MOSCOW
experiment is the by far most sensitive 0-nu-bb experiment since more than 10
years. It operated 11 kg of enriched 76Ge in the Gran Sasso. The collected
statistics in the period 1990 - 2003 is 71.7 kgy. The background achieved in
the energy region of the Q value for double beta decay is 0.11events/kgykeV.
The two-neutrino accompanied half-life is determined on the basis of more than
100000 events to be (1.74. {+0.18}{-0.16})x10^{21}years. The confidence level
for the neutrinoless signal is 4.2 sigma level (more than 5 sigma in the
pulse-shape-selected spectrum). The half-life is T_{1/2}^{0\nu}=(1.19{+0.37}
{-0.23})x10^{25}years. The effective neutrino mass deduced is (0.2-0.6)eV
(99.73% c.l.), i.e. neutrinos have degenerate masses, and consequently can
considerably contribute to hot dark matter in the Universe. The sharp
boundaries for other beyond SM physics, mentioned above, are comfortably
competitive to corresponding results from high-energy accelerators like
TEVATRON, HERA, etc. Some discussion is given on future beta-beta experiments.


title: Investigating F_L(x,Q2) at fixed energy in the color dipole formalism

abstract:
  At small-x, the structure function F_L(x,Q2) is driven by the gluon content
of the nucleon target and consequently it can unravel the underlying QCD
dynamics in that region. In this work, one studies its behavior on photon
virtuality Q2 at fixed energy within the color dipole formalism for models
considering parton saturation effects. The reason is that they resum a wide
class of higher-twist contributions, which have important influence in F_L
description towards low Q2. It is shown that the geometric scaling property
holds for the longitudinal cross section. Moreover, the effective anomalous
dimension in scaling dipole cross sections can be investigated by studing both
the turn over and the large Q2 regions of the recent experimental measurements.


title:
Strangeness and thresholds of phase changes in relativistic heavy ion
  collisions

abstract:
  We discuss how the dynamics of the evolving hot fireball of quark--gluon
matter impacts phase transition between the deconfined and confined state of
matter. The rapid expansion of the fireball of deconfined matter created in
heavy ion collisions facilitates formation of an over-saturated strange quark
phase space. The related excess abundance of strangeness is compensating the
suppression of this semi-heavy quark yield by its quark mass. In addition, the
dynamical expansion of colored quanta pushes against the vacuum structure, with
a resulting supercooling of the transition temperature. We address the status
of the search for the phase boundary as function of reaction energy and
collision centrality and show evidence for a change in reaction mechanism at
sufficiently low energies. The phase diagram derived from the study of hadron
production conditions shows two boundaries, one corresponding to the expected
transition between confined and deconfined matter, with a downward temperature
shift, and the other a high quark density hadronization which appears to
involve heavy effective quarks, at relatively large temperatures.


title: DAMA detection claim is still compatible with all other DM searches

abstract:
  We show that the annual modulation signal observed by DAMA can be reconciled
with all other negative results from dark matter searches with a conventional
halo model for particle masses around 5 to 9 GeV. We also show which particular
dark matter stream could produce the DAMA signal.


title: GZK photons as UHECR above 10$^{19}$ eV

abstract:
  "GZK photons" are produced by extragalactic nucleons through the resonant
photoproduction of pions. We present the expected range of the GZK photon
fraction of UHECR, assuming a particular UHECR spectrum and primary nucleons,
and compare it with the minimal photon fraction predicted by Top-Down models.


title:
Implications for new physics from ${\bar B}^0\to \pi^0\pi^0$ and ${\bar
  B}^0\to {\bar K}^0K^0$

abstract:
  We have analyzed the ${\bar B}^0\to \pi^0\pi^0$ puzzle in three kinds of
models beyond the standard model (SM). It is shown that the minimal flavor
violation (MFV) models, the minimal supersymmetric standard model (MSSM), and
the two Higgs doublet models (2HDM) I and II can not give an explanation of the
${\bar B}^0\to \pi^0\pi^0$ puzzle within $1 \sigma$ experimental bounds and the
model III 2HDM can explain the puzzle without a conflict with other
experimental measurements. If the constraint on $C_{8g}$ from $b\to s g$ is not
imposed, for all kinds of insertions considered there are regions of parameter
space, where the scalar quark mass is larger (much larger) than the gluino mass
in the case of LR or RL (LL or RR), in which the puzzle can be resolved within
$1 \sigma$ experimental bounds.


title: GPDs and underlying spin structure of the nucleon

abstract:
  It is shown that, based only upon two empirically known facts besides two
reasonable theoretical postulates, we are inevitably led to a model-independent
conclusion that the quark orbital angular momentum carries nearly half of the
total nucleon spin at the low energy scale of nonperturbative QCD. Also shown
are explicit model predictions for the forward limit of the unpolarized
spin-flip GPDs, which are believed to give valuable information on the
distributions of quark angular momentum inside the nucleon.


title: Memorino on the `1/2 vs. 3/2 Puzzle' in $\bar B \to l \bar \nu X_c$

abstract:
  After the successes the OPE description has scored in describing $\bar B \to
l \bar \nu X_c$ decays, we need to study what can be said about the composition
of the hadronic final state $X_c$. The same OPE treatment yields sum rules
implying the dominance of $j_q = 3/2$ charm states in $X_c$ over their
$j_q=1/2$ counterparts. This prediction is supported by other general arguments
as well as quark model calculations. At present it is unclear to which degree
data conform to these predictions. More experimental information is essential.
We want to ask our experimental colleagues for a redoubled effort to establish,
which hadronic configurations -- $D/D^* + \pi, D/D^* + 2 \pi, ...$ -- make up
$\Gamma (\bar B \to l \bar \nu X_c)$ beyond $\bar B \to l \bar \nu D/D^*$, what
their quantum numbers are and their mass distributions. The latter is most
relevant for the determination of hadronic mass moments in $\bar B \to l \bar
\nu X_c$. Since all this will require considerable effort on their part, we
want to explain the theoretical issues involved, why they carry `gravitas' --
i.e. are weighty -- and why a better understanding of them will be of
significant value. In this brief memo we sketch the underlying arguments based
on heavy quark theory, the OPE, a special class of quark models and lattice QCD
in a nutshell. After summarizing the experimental situation we conclude with
two lists, namely one with measurements that need to be done and one with items
of theoretical homework. Some of the latter can be done by employing existing
theoretical tools, whereas others need new ideas.


title: CP Violation in the B System: Status and Perspectives

abstract:
  In this decade, the exploration of CP violation is governed by the B-meson
system, where non-leptonic decays play an outstanding role. To set the stage,
we have first a look at the main strategies to circumvent the calculation of
the relevant hadronic matrix elements in these studies, and discuss popular
avenues for physics beyond the Standard Model to enter the roadmap of
quark-flavour physics. We are then well prepared to analyze puzzles in the data
for B -> phi K and B -> pi K decays, and to discuss b -> d penguin processes,
which represent a new territory for the B-factory studies. Finally, we turn to
the physics potential of the Bs-meson system, which can be fully exploited at
the LHC.


title: B Physics: CP Violation Beyond the SM

abstract:
  We analyse the present experimental evidence for a complex CKM matrix, even
allowing for New Physics contributions to $\epsilon_{K}$, $a_{J/\Psi K_{S}}$%,
$\Delta M_{B_{d}}$, $\Delta M_{B_{s}}$, and the $\Delta I=1/2$ piece of $% B\to
\rho \rho $ and $B\to \rho \pi $. We emphasize the crucial r\^{o}le played by
the angle $\gamma $ in both providing irrefutable evidence for a 3$\times $3
complex CKM matrix and placing constraints on the size of NP contributions. It
is shown that even if one allows for New Physics a real CKM matrix is excluded
at a 99.92% C.L., and the probability for the phase $\gamma $ to be in the
interval $[-170^{\circ};-10^{\circ}]\cup \lbrack 10^{\circ};170^{\circ}]$ is
99.7%. Large value of the phase $\chi $, e.g. of order $\lambda $, is only
possible in models where the unitarity of the $3\times 3$
Cabibbo-Kobayashi-Maskawa matrix is violated through the introduction of extra
$Q=2/3$ quarks. We study the allowed range for $\chi $ and the effect of a
large $\chi $ on various low-energy observables, such as CP asymmetries in $B$
meson decays. We also discuss the correlated effects which would be observable
at high energy colliders, like decays $t\to cZ$, etc..


title: Thermodynamics of QCD at large quark chemical potential

abstract:
  We review the existing weak-coupling results on the thermodynamic potential
of deconfined QCD at small and large quark chemical potential and compare with
results from lattice gauge theory as well as the exactly solvable case of
large-N_f QCD. We also discuss the new analytical results on non-Fermi-liquid
effects in entropy and specific heat as well as in dispersion laws of quark
quasiparticles at large quark chemical potential.


title: Volume and Quark Mass Dependence of the Chiral Phase Transition

abstract:
  We investigate chiral symmetry restoration in finite spatial volume and at
finite temperature by calculating the dependence of the chiral phase transition
temperature on the size of the spatial volume and the current-quark mass for
the quark-meson model, using the proper-time Renormalization Group approach. We
find that the critical temperature is weakly dependent on the size of the
spatial volume for large current-quark masses, but depends strongly on it for
small current-quark masses. In addition, for small volumes we observe a
dependence on the choice of quark boundary conditions.


title:
Third order Bose-Einstein correlations by means of Coulomb wave function
  revisited

abstract:
  In previous works, in order to include correction by the Coulomb wave
function in Bose-Einstein correlations (BEC), the two-body Coulomb scattering
wave functions have been utilized in the formulation of three-body BEC.
However, the three-body Coulomb scattering wave function, which satisfies
approximately the three-body Coulomb scattering Schrodinger equation, cannot be
written by the product of the two-body scattering wave functions. Therefore, we
reformulate the three-body BEC, and reanalyze the data. A set of reasonable
parameters is obtained.


title: SU(3) prediction of a new Lambda baryon

abstract:
  Using the approximate flavor SU(3) symmetry of strong interactions, we argue
for the existence of a new Lambda baryon with J^P=3/2^-, the mass around 1850
MeV, the total width of about 130 MeV, significant branching into the Sigma \pi
and Sigma^{\ast} \pi states and a vanishingly small coupling to the N {\bar K}
state. This confirms quark model predictions suggesting a new Lambda baryon in
the mass range between 1775 MeV and 1880 MeV with a very small coupling to the
N {\bar K} state.


title:
Signals of sneutrino-antisneutrino mixing in an $e^- \gamma$ collider in
  anomaly-mediated supersymmetry breaking

abstract:
  Sneutrino-antisneutrino mixing occurs in a supersymmetric model where
neutrinos have nonzero Majorana masses. This can lead to the sneutrino decaying
into a final state with a "wrong-sign charged lepton". Hence, in an $e^-
\gamma$ collider, the signal of the associated production of an
electron-sneutrino and the lighter chargino and their subsequent decays can be
$e^- \gamma \to e^+ {\tilde \tau}_1^- {\tilde \tau}_1^- + \mpT$ where the
${\tilde \tau}_1$s are long-lived and can produce heavily ionizing charged
tracks. This signal is free of any Standard Model background and the
supersymmetric backgrounds are small. Such a signal can be experimentally
observable under certain conditions which are possible to obtain in an
anomaly-mediated supersymmetry breaking scenario. Information on a particular
combination of the neutrino masses and mixing angles can also be extracted
through the observation of this signal. Possible modifications in the signal
event and the accompanying Standard Model background have been discussed when
the ${\tilde \tau}_1$s decay promptly.


title: eV Seesaw with Four Generations

abstract:
  We extend the eV seesaw scenario to four lepton generations. The LSND anomaly
is taken as the right-handed seesaw scale, i.e. m_R ~ eV. The fourth generation
then gives a heavy pseudo-Dirac neutrino which largely decouples from other
generations, and is relatively stable. One effectively has a 3+3 solution to
the LSND anomaly, where we illustrate with numerical solutions. Our study
indicates that the third mixing angle sin^2(theta13) is likely less than 0.01.


title: Comment on "Surprises in threshold antikaon-nucleon physics"

abstract:
  It has recently been claimed by Oller et al. [PRL 95 (2005) 172502] that the
DEAR kaonic hydrogen data can be reconciled with K^- p scattering data in a
chiral unitary approach. In this comment we demonstrate that the proposed
solution violates fundamental principles of scattering theory.


title:
Out of equilibrium quantum field dynamics of an initial thermal state
  after a change in the external field

abstract:
  The effects of the initial temperature in the out of equilibrium quantum
field dynamics in the presence of an homogeneous external field are
investigated. We consider an initial thermal state of temperature T for a
constant external field J. A subsequent sign flip of the external field, J to
-J, gives rise to an out of equilibrium nonperturbative quantum field dynamics.
The dynamics is studied here for the symmetry broken lambda(Phi^2)^2 scalar N
component field theory in the large N limit. We find a dynamical effective
potential for the expectation value that helps to understand the dynamics. The
dynamics presents two regimes defined by the presence or absence of a temporal
trapping close to the metastable equilibrium position of the potential. The two
regimes are separated by a critical value of the external field that depends on
the initial temperature. The temporal trapping is shorter for larger initial
temperatures or larger external fields. Parametric resonances and spinodal
instabilities amplify the quantum fluctuations in the field components
transverse to the external field. When there is a temporal trapping this is the
main mechanism that allows the system to escape from the metastable state for
large N. Subsequently backreaction stops the growth of the quantum fluctuations
and the system enters a quasiperiodic regime.


title: On the SPA Convention and Project

abstract:
  Reconstruction of the fundamental supersymmetric theory and its breaking
mechanism will require high-precision tools. Here a brief introduction to SPA,
the Supersymmetry Parameter Analysis (SPA) Convention and Project, is presented
which is based on a consistent set of conventions and input parameters.


title: A Model of Dark Energy and Dark Matter

abstract:
  A dynamical model for the dark energy is presented in which the
``quintessence'' field is the axion, $a_Z$, of a spontaneously broken global
$U(1)_{A}^{(Z)}$ symmetry whose potential is induced by the instantons of a new
gauge group $SU(2)_Z$. The $SU(2)_Z$ coupling becomes large at a scale
$\Lambda_Z \sim 10^{-3} eV$ starting from an initial value $M$ at high energy
which is of the order of the Standard Model (SM) couplings at the same scale
$M$. A perspective on a possible unification of $SU(2)_Z$ with the SM will be
briefly discussed. We present a scenario in which $a_Z$ is trapped in a false
vacuum characterized by an energy density $\sim (10^{-3} eV)^4$. The lifetime
of this false vacuum is estimated to be extremely large. Other estimates
relevant to the ``coincidence issue'' include the ages of the universe when the
$a_Z$ potential became effective, when the acceleration ``began'' and when the
energy density of the false vacuum became comparable to that of (baryonic and
non-baryonic) matter. Other cosmological consequences include a possible
candidate for the weakly interacting (WIMP) Cold Dark Matter as well as a
scenario for leptogenesis. A brief discussion on possible laboratory detections
of some of the particles contained in the model will also be presented.


abstract:
  The electrical conductivity of a pion gas at low temperatures is studied in
the framework of Linear Response and Chiral Perturbation Theory. The standard
ChPT power counting has to be modified to include pion propagator lines with a
nonzero thermal width in order to properly account for collision effects
typical of Kinetic Theory. With this modification, we discuss the relevant
chiral power counting to be used in the calculation of transport coefficients.
The leading order contribution is found and we show that the dominant higher
order ladder diagrams can be treated as perturbative corrections at low
temperatures. We find that the DC conductivity $\sigma (T)$ is a decreasing
function of $T$, behaving for very low $T$ as $\sigma (T)\sim
e^2m_\pi\sqrt{m_\pi/T}$, consistently with nonrelativistic Kinetic Theory. When
unitarization effects are included, $\sigma(T)$ increases slowly as $T$
approaches the chiral phase transition. We compare with related works and
discuss some physical consequences, especially in the context of the low-energy
hadronic photon spectrum in Relativistic Heavy Ion Collisions.


title: Same-sign top quarks as signature of light stops at the CERN LHC

abstract:
  We present a new method to search for a light scalar top with
$m_{\tilde{t}_1}\lsim m_t$, decaying dominantly into a c-jet and the lightest
neutralino, at the LHC. The principal idea is to exploit the Majorana nature of
the gluino, leading to same-sign top quarks in events of gluino-pair production
followed by gluino decays into top and stop. The resulting signature is 2
b-jets plus 2 same-sign leptons plus additional jets and missing energy. We
perform a Monte Carlo simulation for a benchmark scenario, which is in
agreement with the recent WMAP bound on the relic density of dark matter, and
demonstrate that for $m_{\tilde{g}}\lsim 900$ GeV and
$m_{\tilde{q}}>m_{\tilde{g}}$ the signal can be extracted from the background.
Moreover, we discuss the determination of the stop and gluino masses from the
shape of invariant-mass distributions. The derivation of the shape formulae is
also given.


title: On charm scalar resonances

abstract:
  A brief overview of charm scalar resonances is given. It is demonstrated that
experimental data on the D_s^{*+}gamma and D_s^+pi^0 decays of D_{s0}^+(2317)
favor its assignment to the I_3=0 component of iso-triplet four-quark mesons.
The broad bump just below a large peak of the well-known D_2^* meson in the Dpi
channel is also studied.


title: The spin dependent structure functions of the nucleon

abstract:
  We calculate the spin dependent structure functions g_{1}(x) and g_{2}(x) of
the proton and neutron. Our calculation uses the meson cloud model of nucleon
structure, which has previously given a good description of the HERMES data on
polarized sea quark distributions, and includes all the leading contributions
to spin dependent effects in this model. We find good agreement between our
calculations and the current experimental data for the structure functions. We
include in our calculations kinematic terms, which mix transverse and
longitudinal spin components, for hadrons of spin 1/2, 1 and 3/2, and which can
give considerable contributions to the g_{2} structure functions. We also
consider the possible interference terms between baryons or mesons in different
final states with the same quantum numbers, and show that most of these terms
do not give leading contributions to the spin dependent structure functions.


title: Meson Spectrum and the Glueball

abstract:
  The formation and spectrum of two-particle bound states are investigated
within a simple relativistic quantum field model with the Yukawa-type
interaction. Within this approach, relatively weakly interacting quarks and
gluons form stable bound states under the analytic confinement. By introducing
a minimal set of free parameters (the quark masses, the coupling constant and
the confinement 'radius') and by solving the Bethe-Salpeter equation with
one-gluon exchange, we satisfactorily explain the experimental data for most
known mesons and the glueball.


title:
Automated Calculation Scheme for alpha^n Contributions of QED to Lepton
  g-2: Generating Renormalized Amplitudes for Diagrams without Lepton Loops

abstract:
  Among 12672 Feynman diagrams contributing to the electron anomalous magnetic
moment at the tenth order, 6354 are the diagrams having no lepton loops, i.e.,
those of quenched type. Because the renormalization structure of these diagrams
is very complicated, some automation scheme is inevitable to calculate them. We
developed an algorithm to write down FORTRAN programs for numerical evaluation
of these diagrams, where the necessary counterterms to subtract out ultraviolet
subdivergence are generated according to Zimmermann's forest formula. Thus far
we have evaluated crudely integrals of 2232 tenth-order vertex diagrams which
require vertex renormalization only. Remaining 4122 diagrams, which have
ultraviolet-divergent self-energy subdiagrams and infrared-divergent
subdiagrams, are being evaluated by giving small mass lambda to photons to
control the infrared problem.


title: Holographic Model for Mesons at Finite Temperature

abstract:
  A holographic model of QCD at finite temperature is proposed and thermal
properties for light mesons are examined in terms of this model. We find
interesting temperature dependences of masses and decay constants for several
mesons, and Nambu-Goldstone theorem for the chiral symmetry breaking and
generalized Gell-Mann-Oakes-Renner relation are assured at finite temperature.
Furthermore, we can see in the chiral limit that the speed of the pion in the
thermal medium decreases to zero when the temperature approaches to the
critical point of quark confinement and deconfinement transition, where the
chiral symmetry is restored.


title:
Why is the $3\times 3$ neutrino mixing matrix almost unitary in
  realistic seesaw models?

abstract:
  A simple extension of the standard model is to introduce $n$ heavy
right-handed Majorana neutrinos and preserve its $\rm SU(2)^{}_L \times
U(1)^{}_Y$ gauge symmetry. Diagonalizing the $(3+n) \times (3+n)$ neutrino mass
matrix, we obtain an exact analytical expression for the effective mass matrix
of $\nu^{}_e$, $\nu^{}_\mu$ and $\nu^{}_\tau$. It turns out that the $3\times
3$ neutrino mixing matrix $V$, which appears in the leptonic charged-current
weak interactions, must not be exactly unitary. The unitarity violation of $V$
is negligibly tiny, however, if the canonical seesaw mechanism works to
reproduce the correct mass scale of light Majorana neutrinos. A similar
conclusion can be drawn in the realistic Type-II seesaw models.


title: Chiral perturbation theory - Success and challenge

abstract:
  Chiral perturbation theory is the effective field theory of the strong
interactions at low energies. We will give a short introduction to chiral
perturbation theory for mesons and will discuss, as an example, the
electromagnetic polarizabilities of the pion. These have recently been
extracted from an experiment on radiative $\pi^+$ photoproduction from the
proton ($\gamma p\to \gamma \pi^+ n$) at the Mainz Microtron MAMI. Next we will
turn to the one-baryon sector of chiral perturbation theory and will address
the issue of a consistent power counting scheme. As examples of the
heavy-baryon framework we will comment on the extraction of the axial radius
from pion electroproduction and will discuss the generalized polarizabilities
of the proton. Finally, we will discuss two recently proposed manifestly
Lorentz-invariant renormalization schemes and illustrate their application in a
calculation of the nucleon electromagnetic form factors.


title: Reconciling resummation and renormalization

abstract:
  In the naive form of most resummations we get into conflict with
order-by-order renormalization. We present a method that is capable to ensure
UV consistency of any resummations satisfying certain conditions. The method is
based on the observation that resummation is equivalent with a calculation in
an adequate perturbation scheme, followed by a renormalization scheme changing.
This framework works both in static and momentum-dependent cases. In particular
it is possible to establish finite infrared 2PI resummation.


title: Moments of Wigner function and Renyi entropies at freeze-out

abstract:
  Relation between Renyi entropies and moments of the Wigner function,
representing the quantum mechanical description of the M-particle
semi-inclusive distribution at freeze-out, is investigated. It is shown that in
the limit of infinite volume of the system, the classical and quantum
descriptions are equivalent. Finite volume corrections are derived and shown to
be small for systems encountered in relativistic heavy ion collisions.


title:
Neutrino mixing and CP violation from Dirac-Majorana bimaximal mixture
  and quark-lepton unification

abstract:
  We demonstrate that only two ansatz can produce the features of the neutrino
mixing angles. The first ansatz comes from the quark-lepton grand unification;
$\nu_{Di} = V_{CKM} \nu_{\alpha}$ is satisfied for left-handed neutrinos, where
$\nu_{Di}$ are the Dirac mass eigenstates and $\nu_{\alpha}$ are the flavour
eigenstates. The second ansatz comes from the assumption; $\nu_{Di} =
U_{bimaximal} \nu_{i}$ is satisfied between the Dirac mass eigenstates
$\nu_{Di}$ and the light Majorana neutrino mass eigenstates $\nu_{i}$, where
$U_{bimaximal}$ is the bimaximal mixing matrix. By these two ansatz, the
Maki-Nakagawa-Sakata matrix is given by $U_{MNS} = V_{CKM}^\dagger
U_{bimaximal}$. We find that in this model the novel relation $\theta_{sol} +
\theta_{13} = \pi/4$ is satisfied, where $\theta_{sol}$ and $\theta_{13}$ are
solar and CHOOZ angle respectively. This "Solar-CHOOZ Complementarity" relation
indicates that only if the CHOOZ angle $\theta_{13}$ is sizable, the solar
angle $\theta_{sol}$ can deviate from the maximal mixing. We also infer the CP
violation in neutrino oscillations. The leptonic Dirac CP phase $\delta_{MNS}$
is predicted as $\sin \delta_{MNS} \simeq A \lambda^2 \eta$, where $A, \lambda,
\eta$ are the CKM parameters in Wolfenstein parametrization. Furthermore, we
remark that the ratio of the Jarlskog CP violation factor for quarks and
leptons is important, because the large uncertainty on $\eta$ is cancelled out
in the ratio, $R_J \equiv J_{CKM}/J_{MNS} \simeq 4\sqrt{2} A \lambda^3 \simeq 5
\times 10^{-2}$.


title: Strange Quark Mass from Pseudoscalar Sum Rule with O(alpha_s^4) Accuracy

abstract:
  We include the new, five-loop, O(alpha_s^4) correction into the QCD sum rule
used for the s-quark mass determination. The pseudoscalar Borel sum rule is
taken as a study case. The OPE for the correlation function with N^4LO,
O(alpha_s^4) accuracy in the perturbative part, and with dimension <= 6
operators reveals a good convergence. We observe a significant improvement of
stability of the sum rule with respect to the variation of the renormalization
scale after including the O(alpha_s^4) correction. We obtain the interval m_s(2
GeV)=105 \pm 6 \pm 7 MeV, which exhibits about 2 MeV increase of the central
value, if the O(alpha_s^4) terms are removed.


title: Unification of Dark Energy and Dark Matter

abstract:
  We propose a scenario in which dark energy and dark matter are described in a
unified manner. The ultralight pseudo-Nambu-Goldstone (pNG) boson, A, naturally
explains the observed magnitude of dark energy, while the bosonic supersymmetry
partner of the pNG boson, B, can be a dominant component of dark matter. The
decay of B into a pair of electron and positron may explain the 511 keV gamma
ray from the Galactic Center.


title: Physics Reach with a Monochromatic Neutrino Beam from Electron Capture

abstract:
  Neutrino oscillation experiments from different sources have demonstrated
non-vanishing neutrino masses and flavour mixings. The next experiments have to
address the determination of the connecting mixing U(e3) and the existence of
the CP violating phase. Whereas U(e3) measures the strength of the oscillation
probability in appearance experiments, the CP phase acts as a phase-shift in
the interference pattern. Here we propose to separate these two parameters by
energy dependence, using the novel idea of a monochromatic neutrino beam
facility based on the acceleration of ions that decay fast through electron
capture. Fine tuning of the boosted neutrino energy allows precision
measurements able to open a window for the discovery of CP violation, even for
a mixing as small as 1 degree.


title: Complex Angular Momenta and the Problem of Exotic States

abstract:
  After some brief personal recollections about V.N.Gribov, I demonstrate that
his results and ideas on complex angular momenta may be applied in unfamiliar
directions. As an example, it is shown, that any strong interaction amplitude,
satisfying dispersion relation (in momentum transfer), has infinite number of
energy-plane poles, both for exotic and non-exotic quantum numbers. This result
ensures the necessary condition for existence of exotic hadrons. However,
without more detailed knowledge of dynamics one cannot secure sufficient
conditions for the exotics existence.


title: Perspectives in Neutrino Physics: Monochromatic Neutrino Beams

abstract:
  In the last few years spectacular results have been achieved with the
demonstration of non vanishing neutrino masses and flavour mixing. The ultimate
goal is the understanding of the origin of these properties from new physics.
In this road, the last unknown mixing $[U_{e3}]$ must be determined. If it is
proved to be non-zero, the possibility is open for Charge Conjugation-Parity
(CP) violation in the lepton sector. This will require precision experiments
with a very intense neutrino source. Here a novel method to create a
monochromatic neutrino beam, an old dream for neutrino physics, is proposed
based on the recent discovery of nuclei that decay fast through electron
capture. Such nuclei will generate a monochromatic directional neutrino beam
when decaying at high energy in a storage ring with long straight sections. We
also show that the capacity of such a facility to discover new physics is
impressive, so that fine tuning of the boosted neutrino energy allows precision
measurements of the oscillation parameters even for a $[U_{e3}]$ mixing as
small as 1 degree. We can thus open a window to the discovery of CP violation
in neutrino oscillations.


title: Jet Quenching from soft QCD Scattering in the Quark-Gluon Plasma

abstract:
  We show that partons traversing a quark-gluon plasma can lose substantial
amounts of energy also by scatterings, and not only through medium-induced
radiation as mainly considered previously. Results from Monte Carlo simulations
of soft interactions of partons, emerging from a hard scattering, through
multiple elastic scatterings on gluons in an expanding relativistic plasma show
a sizeable jet quenching which can account for a substantial part of the effect
observed in RHIC data.


title: Phenomenological viability of orbifold models with three Higgs families

abstract:
  We discuss the phenomenological viability of string multi-Higgs doublet
models, namely a scenario of heterotic $Z_3$ orbifolds with two Wilson lines,
which naturally predicts three supersymmetric families of matter and Higgs
fields. We study the orbifold parameter space, and discuss the compatibility of
the predicted Yukawa couplings with current experimental data. We address the
implications of tree-level flavour changing neutral processes in constraining
the Higgs sector of the model, finding that viable scenarios can be obtained
for a reasonably light Higgs spectrum. We also take into account the tree-level
contributions to indirect CP violation, showing that the experimental value of
$\epsilon_K$ can be accommodated in the present framework.


title: Branon Phenomenology

abstract:
  In brane-world models with low tension, the fluctuations of the brane along
the extra dimensions (branons) are the only relevant new low-energy modes. Such
branon fields are in general massive, stable and weakly interacting, and
accordingly they are natural candidates to explain the universe missing mass
problem. On the other hand, the branon phenomenology is very rich because they
couple to all the Standard Model particles. Distinctive branon signals could be
observed in next colliders and in dark matter searches.


title: Neutrino masses and mixing

abstract:
  Status of determination of the neutrino masses and mixing is formulated and
possible uncertainties, especially due to presence of the sterile neutrinos,
are discussed. The data hint an existence of special ``neutrino'' symmetries.
If not accidental these symmetries have profound implications and can
substantially change the unification program. The key issue on the way to
underlying physics is relations between quarks and leptons. The approximate
quark-lepton symmetry or universality can be reconciled with strongly different
patterns of masses and mixings due to nearly singular character of the mass
matrices or screening of the Dirac structures in the double see-saw mechanism.