title: Testable Flipped SU(5) x U(1)_X Models

abstract:
  The little hierarchy between the GUT scale and the string scale may give us
some hints that can be tested at the LHC. To achieve string-scale gauge
coupling unification, we introduce additional vector-like particles. We require
that these vector-like particles be standard, form complete GUT multiplets, and
have masses around the TeV scale or close to the string scale. Interestingly,
only the flipped SU(5) x U(1)_X models can work elegantly. We consider all
possible sets of vector-like particles with masses around the TeV scale. And we
introduce vector-like particles with masses close to the string scale which can
mimic the string-scale threshold corrections. We emphasize that all of these
vector-like particles can be obtained in the interesting flipped SU(5) x U(1)_X
string models from the four-dimensional free fermionic string construction.
Assuming the low-energy supersymmetry, high-scale supersymmetry, and split
supersymmetry, we show that the string-scale gauge coupling unification can
indeed be achieved in the flipped SU(5) x U(1)_X models. These models can be
tested at the LHC by observing simple sets of vector-like particles at the TeV
scale. Moreover, we discuss a simple flipped SU(5) x U(1)_X model with
string-scale gauge coupling unification and high-scale supersymmetry by
introducing only one pair of the vector-like particles at the TeV scale, and we
predict the corresponding Higgs boson masses. Also, we briefly comment on the
string-scale gauge coupling unification in the model with low-energy
supersymmetry by introducing only one pair of the vector-like particles at the
intermediate scale. And we briefly comment on the mixings among the SM fermions
and the corresponding extra vector-like particles.


title: Intermediate mass dileptons in relativistic nuclear collisions

abstract:
  We consider the production of lepton pairs with intermediate invariant
masses, in relativistic nuclear collisions. Thermal sources are briefly
discussed, as well as a newer production mechanism which involves jet-plasma
interactions. Estimates for high p_T lepton pairs are provided.


title: Diquark Approach to Calculating the Mass and Stability of H - Dibaryon

abstract:
  By using of vector diquark ideas in the chiral limit diquark correlations in
the relativistic region and imposing HF interactions between quarks in a vector
diquark we calculated the mass of H-dibaryon, also by using of tunneling method
we simultaneously calculated its decay width.


title: Phenomenology of Universal Extra Dimensions

abstract:
  In this proceeding, the phenomenology of Universal Extra Dimensions (UED), in
which all the Standard Model fields propagate, is explored. We focus on models
with one universal extra dimension, compactified on an $S_1/Z_2$ orbifold. We
revisit calculations of Kaluza-Klein (KK) dark matter without an assumption of
the KK mass degeneracy including all possible coannihilations. We then contrast
the experimental signatures of low energy supersymmetry and UED.


title: Electroweak Physics: Theoretical Overview

abstract:
  I give an overview of the theory status of predictions for single W and Z
boson production at hadron colliders. I briefly report on work in progress for
improvements necessary to match the anticipated high precision of electroweak
measurements, such as the W mass and width, at the Fermilab Tevatron p anti-p
and the CERN LHC pp colliders.


title: Prospects of medium tomography using back-to-back hadron correlations

abstract:
  We discuss the prospects of extracting information about the bulk QCD matter
distribution and evolution on the basis of hard hadronic back-to-back
correlations in ultrarelativistic heavy-ion collisions. Using both
hydrodynamical and parametrized evolution models for the spacetime evolution of
the produced matter, which have been tested against RHIC data, we study six
different setups for the spacetime dependence of hard-parton energy losses.
Assuming that the energy loss of hard partons traversing the medium is
radiative and calculable in the BDMPS formalism, we adjust one parameter, the
quenching power scale, to the measured R_AA in each of the setups and study the
systematic variations of the back-to-back yield as a function of p_T. We show
which spacetime regions are probed by one-particle and two-particle observables
and study the role of longitudinal and transverse expansion in some detail. We
also comment on the importance of considering fluctuations around the average
energy loss. We conclude that while current data are too limited in momentum
coverage, future data for higher trigger energy might provide the lever arm in
away side hadron momentum necessary to perform medium tomography, provided that
sufficient precision can be achieved.


title:
The curvature of $F_2^p(x,Q^2)$ as a probe of the range of validity of
  perturbative QCD evolutions in the small-$x$ region

abstract:
  Perturbative NLO and NNLO QCD evolutions of parton distributions are studied,
in particular in the (very) small-$x$ region, where they are in very good
agreement with all recent precision measurements of $F_2^p(x,Q^2)$. These
predictions turn out to be also rather insensitive to the specific choice of
the factorization scheme ($\bar{\rm MS}$ or DIS). A characteristic feature of
perturbative QCD evolutions is a {\em{positive}} curvature of $F_2^p$ which
increases as $x$ decreases. This perturbatively stable prediction provides a
sensitive test of the range of validity of perturbative QCD.


title:
Neutrino masses and mixings in a Minimal S_3-invariant Extension of the
  Standard Model

abstract:
  The mass matrices of the charged leptons and neutrinos, that had been derived
in the framework of a Minimal S_3-invariant Extension of the Standard Model,
are here reparametrized in terms of their eigenvalues. The neutrino mixing
matrix, V_PMNS, is then computed and exact, explicit analytical expressions for
the neutrino mixing angles as functions of the masses of the neutrinos and
charged leptons are obtained. The reactor, theta_13, and the atmosferic,
theta_23, mixing angles are found to be functions only of the masses of the
charged leptons. The numerical values of theta_13{th} and theta_23{th} computed
from our theoretical expressions are found to be in excellent agreement with
the latest experimental determinations. The solar mixing angle, theta_12{th},
is found to be a function of both, the charged lepton and neutrino masses, as
well as of a Majorana phase phi_nu. A comparison of our theoretical expression
for the solar angle theta_12{th} with the latest experimental value
theta_12{exp} ~ 34 deg allowed us to fix the scale and origin of the neutrino
mass spectrum and obtain the mass values |m_nu1|=0.0507 eV, |m_nu2|=0.0499 eV
and |m_nu3|=0.0193 eV, in very good agreement with the observations of neutrino
oscillations, the bounds extracted from neutrinoless double beta decay and the
precision cosmological measurements of the CMB.


title: Study of the semileptonic decays B->pi, D->pi and D->K

abstract:
  The semileptonic decay B->pi is studied starting from a simple quark model
that takes into account the effect of the B* resonance. A novel, multiply
subtracted, Omnes dispersion relation has been implemented to extend the
predictions of the quark model to all q^2 values accesible in the physical
decay. By comparison to the experimental data, we extract |V_ub|=0.0034 +/-
0.0003(exp.) +/- 0.0007(theory). As a further test of the model, we have also
studied D->pi and D->K decays for which we get good agreement with experiment.


title: B -> pi pi decays

abstract:
  The branching ratios and CP asymmetries of
  $B\to \pi\pi$ decays measured in B factory experiments indicate a large ratio
of color-suppressed ($C$) to color-allowed ($T$) tree contributions and a large
relative phase between the tree and penguin amplitude. In this talk, I would
like to report on a recent analysis to see whether the large $C/T$ ratio can be
explained within the QCD based model with i) a large contribution from the
annihilation terms or with ii) large final-state-interaction phase between two
different isospin amplitudes. We show that the current experimental data do not
exclude either possibility but we may be able to distinguish these two effects
in future measurements of direct CP asymmetry in $B\to \pi^{0}\pi^{0}$ decay.


title: Neutrino oscillations: theory and phenomenology

abstract:
  A brief overview of selected topics in the theory and phenomenology of
neutrino oscillations is given. These include: oscillations in vacuum and in
matter; phenomenology of 3-flavour neutrino oscillations and effective
2-flavour approximations; CP and T violation in neutrino oscillations in vacuum
and in matter; matter effects on \nu_\mu \leftrightarrow \nu_\tau oscillations;
parametric resonance in neutrino oscillations inside the earth; oscillations
below and above the MSW resonance; unsettled issues in the theory of neutrino
oscillations.


title:
Comparative Analysis of Super-Kamiokande and SNO Solar-Neutrino Data and
  the Photospheric Magnetic Field

abstract:
  We analyze Super-Kamiokande, SNO, and photospheric magnetic-field data for
the common time interval, namely the SNO D2O phase. Concerning rotational
modulation, the magnetic-field power spectrum shows the strongest peaks at the
second and sixth harmonics of the solar synodic rotation frequency [3 nu(rot)
and 7 nu(rot)]. The restricted Super-Kamiokande dataset shows strong modulation
at the second harmonic. The SNO D2O dataset shows weak modulation at that
frequency, but strong modulation in the sixth-harmonic frequency band. We
estimate the significance level of the correspondence of the Super-Kamiokande
second-harmonic peak with the corresponding magnetic-field peak to be 0.0004,
and the significance level of the correspondence of the SNO D2O sixth-harmonic
peak with the corresponding magnetic-field peak to be 0.009. By estimating the
amplitude of the modulation of the solar neutrino flux at the second harmonic
from the restricted Super-Kamiokande dataset, we find that the weak power at
that frequency in the SNO D2O power spectrum is not particularly surprising.
Concerning 9.43 yr-1, we find no peak at this frequency in the power spectrum
formed from the restricted Super-Kamiokande dataset, so it is no surprise that
this peak does not show up in the SNO D2O dataset, either.


title: More about sgoldstino interpretation of HyperCP events

abstract:
  We further discuss possible sgoldstino interpretation of the observation,
reported by the HyperCP collaboration, of three \Sigma^+\to p\mu^+\mu^- decay
events with dimuon invariant mass 214.3 MeV within detector resolution. With
sgoldstino mass equal to 214.3 MeV, this interpretation can be verified at
existing and future B- and \phi-factories. We find that the most natural values
of the branching ratios of two-body B- and D-meson decays to sgoldstino P and
vector meson V are about 10^{-6}\div10^{-7}. The branching ratios of \phi-meson
decay \phi\to P\gamma is estimated to be in the range 1.8\cdot 10^{-13} \div
1.6\cdot 10^{-7}, depending on the hierarchy of supersymmetry breaking soft
terms. Similar branchings for \rho- and \omega-mesons are in the range
10^{-14}\div 3.4\cdot 10^{-7}.


title: Analysis of Br(B-->X_s gamma) at NNLO with a Cut on Photon Energy

abstract:
  By combining a recent estimate of the total B-->X_s gamma branching fraction
at O(alpha_s^2) with a detailed analysis of the effects of a cut E_gamma>1.6GeV
on photon energy, a prediction for the partial B-->X_s gamma branching fraction
at next-to-next-to-leading order in renormalization-group improved perturbation
theory is obtained, in which contributions from all relevant scales are
properly factorized. The result Br(B-->X_s gamma)=(2.98+-0.26)x10^{-4} is about
1.4 sigma lower than the experimental world average. This opens a window for
significant New Physics contributions in rare radiative B decays.


title: Reconciling the CAST and PVLAS Results

abstract:
  The PVLAS experiment has recently claimed evidence for an axion-like particle
in the milli-electron-Volt mass range with a coupling to two photons that
appears to be in contradiction with the negative results of the CAST experiment
searching for solar axions. The simple axion interpretation of these two
experimental results is therefore untenable and it has posed a challenge for
theory. We propose a possible way to reconcile these two results by postulating
the existence of an ultralight pseudo-scalar particle interacting with two
photons and a scalar boson and the existence of a low scale phase transition in
the theory.


title: Spectral tilt in A-term inflation

abstract:
  Recently in hep-ph/0605035 and hep-ph/0608138, we have shown that primordial
inflation can be embedded within the Minimal Supersymmetric Standard Model,
while providing the right amplitude for the density perturbations and a tilted
spectrum which matches the current data. In this short note we show that the
model predicts a range of spectral tilt, $0.92 \leq n_s \leq 1$, depending on
deviation from the saddle point condition. The spectral tilt saturates the
lower limit when the saddle point condition is met. On the other hand the upper
limit can be achieved for a slight deviation towards the point of inflection.
The running of the spectral tilt remains small, and the amplitude of the
temperature anisotropies remains in the correct observational regime.


title: CPT-odd Leptogenesis

abstract:
  We calculate the baryon asymmetry of the Universe resulting from the
combination of higher-dimensional Lorentz-noninvariant CPT-odd operators and
dimension five operators that induce the majorana mass for neutrinos. The
strength of CPT-violating dimension five operators capable of producing the
observed value of baryon abundance is directly related to neutrino masses and
found to be in the trans-Planckian range 10^{-24}-10^{-22} GeV^{-1}.
Confronting it with observational tests of Lorentz symmetry, we find that this
range of Lorentz/CPT violation is strongly disfavored by the combination of the
low-energy constraints and astrophysical data.


title: QCD Coulomb Gauge Approach to Exotic Hadrons

abstract:
  The Coulomb gauge Hamiltonian model is used to calculate masses for selected
J^{PC} states consisting of exotic combinations of quarks and gluons: ggg
glueballs (oddballs), q bar{q} g hybrid mesons and q bar{q} q bar{q} tetraquark
systems. An odderon Regge trajectory is computed for the J^{--} glueballs with
intercept much smaller than the pomeron, explaining its nonobservation. The
lowest 1^{-+} hybrid meson mass is found to be just above 2.2 GeV while the
lightest tetraquark state mass with these exotic quantum numbers is predicted
around 1.4 GeV consistent with the observed pi(1400).


title: D6 Family Symmetry and Cold Dark Matter at LHC

abstract:
  We consider a non-supersymmetric extension of the standard model with a
family symmetry based on D6 Z2 Z2, where one of Z2's is exactly conserved. This
Z2 forbids the tree-level neutrino masses and simultaneously ensures the
stability of cold dark matter candidates. From the assumption that cold dark
matter is fermionic we can single out the D6 singlet right-handed neutrino as
the best cold dark mater candidate. We find that an inert charged Higgs with a
mass between 300 and 750 GeV decays mostly into an electron (or a positron)
with a large missing energy, where the missing energy is carried away by the
cold dark matter candidate. This will be a clean signal at LHC.


title: D^0-D^0bar mixing in \Upsilon(1S) \to D^0 D^0bar decay at Super-B

abstract:
  $\Dz-\Dzb$ mixing and significant CP violation in the charm system may
indicate the signature of new physics. In this study, we suggest that the
coherent $\DzDzb$ events from the decay of $\Upsilon(1S) \to \Dz \Dzb$ can be
used to measure both mixing parameters and CP violation in charm decays. The
neutral $D$ mesons from $\Upsilon(1S)$ decay are strongly boosted, so that it
will offer the possibility to measure the proper-time interval, $\Delta t$,
between the fully-reconstructed $\Dz$ and $\Dzb$. Both coherent and
time-dependent information can be used to extract $\Dz-\Dzb$ mixing parameters.
The sensitivity of the measurement should be improved at B factories or
super-B.


title:
Transverse momentum distributions in Semi-inclusive Deep Inelastic
  Scattering

abstract:
  Within a perturbative approach to Quantum Chromodynamics (QCD), we show how
to extend ordinary DGLAP longitudinal evolution equations to include the
radiative transverse momentum generated in the collinear branching regime.
Considering Semi-inclusive Deep Inelastic Scattering as a reference process, we
perform such a generalization both in the current and in the target
fragmentation region. These distributions are then used to predict
semi-inclusive Deep Inelastic Scattering cross-sections onto the whole phase
space of the detected hadron.


title: Supersymmetry spectroscopy in stop-chargino production at LHC

abstract:
  We consider the process of associated stop-chargino production in the MSSM at
LHC and show that, at the simplest Born level, the production rate is
dramatically sensitive to the choice of the benchmark points, oscillating from
potentially "visible" maxima of the picobarn size to much smaller, hardly
"visible", values. Adopting a canonical choice of SM type CKM matrices, we also
show that in some "visible" cases the total rate exhibits a possibly relevant
dependence on tan(beta).


title:
Addendum to ``Decoupling of pion coupling $f_{\pi}$ from quarks at high
  density in three models, and its possible observational consequences"

abstract:
  The pions decouple from quarks while their coupling to nucleons $g_{\pi NN}$
remains unchanged at high density. This will have consequences for some recent
papers.


title: Looking for a heavy wino LSP in collider and dark matter experiments

abstract:
  We investigate the phenomenology of a wino LSP as obtained in AMSB and some
string models. The WMAP constraint on the DM relic density implies a wino LSP
mass of 2.0-2.3 TeV. We find a viable signature for such a heavy wino at CLIC,
operating at its highest CM energy of 5 TeV. One also expects a viable
monochromatic $\gamma$-ray signal from its pair-annihilation at the galactic
centre at least for cuspy DM halo profiles.


title: Power-like corrections and the determination of the gluon distribution

abstract:
  Power-suppressed corrections to parton evolution may affect the theoretical
accuracy of current determinations of parton distributions. We study the role
of multigluon-exchange terms in the extraction of the gluon distribution for
the Large Hadron Collider (LHC). Working in the high-energy approximation, we
analyze multi-gluon contributions in powers of 1/Q^2. We find a moderate,
negative correction to the structure function's derivative d F_2 / d \ln Q^2,
characterized by a slow fall-off in the region of low to medium Q^2 relevant
for determinations of the gluon at small momentum fractions.


title:
On MSSM charged Higgs boson production in association with an
  electroweak W boson at electron positron colliders

abstract:
  We present a calculation of the cross section for the process e+ e- --> W+/-
H-/+ in the minimal supersymmetric standard model (MSSM) and the Two Higgs
Doublet Model (THDM). We study the basic features of the MSSM prediction for
some distinctive parameter scenarios. We find large effects from virtual
squarks for scenarios with large mixing in the stop sector which can lead to a
cross section vastly different from a THDM with identical Higgs sector
parameters. We investigate this interesting behaviour in more detail by
thoroughly scanning the MSSM parameter space for regions of large cross
section. For a charged Higgs boson too heavy to be pair-produced at such a
machine, it turns out that a large MSSM cross section with a good chance of
observation is linked to a squark mass scale below 600 GeV and a considerable
amount of mixing in either the stop and sbottom sector.


title:
Interference between W-prime and W in single-top quark production
  processes

abstract:
  The paper is devoted to studies of prospects to search for hypothetical
W-prime gauge bosons at hadron colliders via single-top quark production
process. A special attention is paid to the interference between the Standard
Model (SM) W and W-prime} boson contributions. A model independent analysis is
performed for a wide interval of W-prime} masses potentially acceptable for a
detection at the Tevatron and LHC. It is shown that the interference
contribution to the cross section of the most promising s-channel single top
production mode could be as large as 30 % for certain parameter points which is
comparable to NLO effects computed in previous studies separately for the
W-prime signal and the SM single-top background. The interference contribution
affects particle distributions and has to be taken into account for more
accurate W-prime signal and background simulation.


title:
Resolution of an apparent inconsistency in the electromagnetic Casimir
  effect

abstract:
  The vacuum expectation value of the electromagnetic energy-momentum tensor
between two parallel plates in spacetime dimensions D > 4 is calculated in the
axial gauge. While the pressure between the plates agrees with the global
Casimir force, the energy density is divergent at the plates and not compatible
with the total energy which follows from the force. However, subtracting the
divergent self-energies of the plates, the resulting energy is finite and
consistent with the force. In analogy with the corresponding scalar case for
spacetime dimensions D > 2, the divergent self-energy of a single plate can be
related to the lack of conformal invariance of the electromagnetic Lagrangian
for dimensions D > 4.


title:
Strategies and obstacles in constructing realistic higher-dimensional
  models

abstract:
  We discuss several aspects of higher dimensional models that contain bulk
gauge and fermion fields only. In particular we argue that non-standard
boundary conditions involving charge-conjugate fermion fields offer attractive
model building possibilities. We also discuss a no-go theorem for 5-dimensional
models which severely limits their phenomenological relevance.


title: Direct photon radiation from a rich baryon Quark-Gluon Plasma system

abstract:
  The direct photon radiation from a hot and slightly strong interacting
fireball system of a rich baryon quark-gluon plasma, using the Boltzmann
distribution function for the incoming particles and Bose-Einstein distribution
for gluon and Fermi-Dirac distribution for quark,antiquark and Boltzmann
distribution for gluon are discussed subsequently. The first two distribution
functions are chosen for the photon production of the first case and the last
two functions are considered for the second case of my photon production. The
thermal photon emission rate is found that it is infra-red divergent for the
massless quarks and this divergence in the quark mass is regulated using
different cut-off in the quark mass. However, I remove this divergence using
the technique of Braaten and Pisarski in the thermal mass of the system in my
model of calculation with a coupling parameter of QGP fireball. Thus, the
production rate of the thermal photon is found to be smoothly worked by this
cut-off technique of this model and the result is found to be increasing
function with the increase of the variation in the value of the chemical
potential $\mu $


title:
The BFKL Pomeron Calculus in zero transverse dimensions: diffractive
  processes and survival probability for central diffractive production

abstract:
  In this paper we discuss the processes of diffractive production in the
framework of the BFKL Pomeron calculus in zero transverse dimension.
Considering the diffractive production of a bunch of particles with not very
large masses, namely,
  $\ln\Lb M^2/m^2 \Rb \ll \frac{1}{\bas} \ln\Lb \frac{N^2_c}{\bas^2}\Rb$, we
found explicit formulae for calculation of the cross sections for the single
and double diffractive production as well as for the value of the survival
probability for the diffractive central production. These formulae include the
influence of the correlations due to so called Pomeron loops on the values of
all discussed observables. The comparison with the other approaches on the
market is given. The main conclusion of this comparison: the
Mueller-Patel-Salam-Iancu approximation gives sufficiently good descriptions
and close to the exact result for elastic and diffractive cross section but
considerable overshoot the value of the survival probability.


title: A FORTRAN code for $\gamma \gamma \to Z Z $ in SM and MSSM

abstract:
  Through the present paper, the code gamgamZZ is presented, which may be used
to calculate all possible observables related to the process $\gamma \gamma \to
ZZ$, in either the Standard Model (SM), or the minimal sypersymmetric standard
model (MSSM) with real parameters.


title: Inclusive search for SUSY in top final states at CMS

abstract:
  An inclusive search for low mass SUSY using the top plus missing transverse
energy signature at CMS is presented. A 5$\sigma$ excess can be observed with
$\sim$250 pb$^{-1}$ at a particular low mass SUSY point. With the same analysis
selection the 5$\sigma$ discovery reach contours in the mSUGRA parameter space
for 1 and 10 fb$^{-1}$ are obtained.


title:
Supersymmetric QCD corrections to single top quark production at hadron
  colliders

abstract:
  We present the calculations of the supersymmetric QCD corrections to the
total cross sections for single top production at the Fermilab Tevatron and the
CERN Large Hadron Collider in the minimal supersymmetric standard model. Our
results show that for the s-channel and t-channel, the supersymmetric QCD
corrections are at most about 1%, but for the associated production process,
the supersymmetric QCD corrections increase the total cross sections
significantly, which can reach about 6% for most values of the parameters, and
the supersymmetric QCD corrections should be taken into consideration in the
future high precision experimental analysis for top physics.


title: Discovering Chiral Higgsinos at the LHC

abstract:
  The concept of chirality is extended to the Minimal Supersymmetric Standard
Model (MSSM) and the mu term is forbidden by a gauged U(1)' symmetry. R-parity
automatically emerges after symmetry breaking, suppressing proton decay and
protecting the LSP. Exotics charged under the SM pose a challenge to
traditional SU(5) unification, but unification is still implemented in
deconstructed GUTs. Because of the multitude of additional states to the MSSM,
the Z' has a large width, and the SM background, neglected in previous
theoretical studies, becomes important for Z' discovery. As a result, the LHC
reach is reduced from 3.2 TeV, for a Z' with SM decays, to 1.5 TeV, when
additional decay channels are included. This model also predicts possibly
long-lived colored and electroweak exotics.


title: On-Shell Unitarity Bootstrap for QCD Amplitudes

abstract:
  We describe the recently developed on-shell bootstrap for computing one-loop
amplitudes in non-supersymmetric theories such as QCD. The method combines the
unitarity method with loop-level on-shell recursion. The unitarity method is
used to compute cut-containing parts of amplitudes, and on-shell recursion is
used for the remaining rational terms.


title: Quark distributions in QCD sum rules: unexpected features and paradoxes

abstract:
  Some very unusual features of the hadron structure functions, obtained in the
generalized QCD sum rules, like the surprisingly strong difference between
longitudinally and transversally polarized $\rho$ mesons structure functions
and the strong suppression of the gluon sea in longitudinally polarized $\rho$
mesons are discussed. Also the problem of exact zero contribution of gluon
condensates to pion and longitudinally polarized $\rho$ meson quark
distributions is discussed.


title: Strange meson-nucleon states in the quark potential model

abstract:
  The quark potential model and resonating group method are used to investigate
the $\bar{K}N$ bound states and/or resonances. The model potential consists of
the t-channel and s-channel one-gluon exchange potentials and the confining
potential with incorporating the QCD renormalization correction and the
spin-orbital suppression effect in it. It was shown in our previous work that
by considering the color octet contribution, use of this model to investigate
the $KN$ low energy elastic scattering leads to the results which are in pretty
good agreement with the experimental data. In this paper, the same model and
method are employed to calculate the masses of the $\bar{K}N$ bound systems.
For this purpose, the resonating group equation is transformed into a standard
Schr\"odinger equation in which a nonlocal effective $\bar{K}N$ interaction
potential is included. Solving the Schr\"odinger equation by the variational
method, we are able to reproduce the masses of some currently concerned
$\bar{K}N$ states and get a view that these states possibly exist as $\bar{K}N$
molecular states. For the $KN$ system, the same calculation gives no support to
the existence of the resonance $\Theta ^{+}(1540)$ which was announced
recently.


title:
A Possible Mechanism for the Low Shear Viscosity in the QGP Created by
  RHIC

abstract:
  We study the Anderson Localization effect on the shear viscosity in a system
with random medium by Kubo formula. We show that this effect can reduce the
shear viscosity nonperturbatively. Then we discuss its possible implementation
in heavy-ion collisions, where the created heavy bound states or other
collective modes may play the role of the random scatterer underlying Anderson
Localization effect.


title: Resummations in QCD: recent developments

abstract: A short overview of recent developments on resummations in QCD is presented.


title:
The Effects on $S$, $T$, and $U$ from Higher-Dimensional Fermion
  Representations

abstract:
  Inspired by a new class of walking technicolor models recently proposed using
higher-dimensional technifermions, we consider the oblique corrections from
heavy non-degenerate fermions with two classes of higher-dimensional
representations of the electroweak gauge group itself. One is chiral SM-like,
and the other is vector-like. In both cases, we obtain explicit expressions for
$S$, $T$, $U$ in terms of the fermion masses. We find that to keep the $T$
parameter ultraviolet-finite there must be a stringent constraint on the mass
non-degeneracy of a heavy fermion multiplet.


title:
The Quantum and Local Polyakov loop in Chiral Quark Models at Finite
  Temperature

abstract:
  We describe results for the confinement-deconfinement phase transition as
predicted by the Nambu--Jona-Lasinio model where the local and quantum Polyakov
loop is coupled to the constituent quarks in a minimal way (PNJL). We observe
that the leading correlation of two Polyakov loops describes the chiral
transition accurately. The effects of the current quark mass on the transition
are also analysed.


title: Simulations of Cold Electroweak Baryogenesis: Finite time quenches

abstract:
  The electroweak symmetry breaking transition may supply the appropriate
out-of-equilibrium conditions for baryogenesis if it is triggered sufficiently
fast. This can happen at the end of low-scale inflation, prompting baryogenesis
to occur during tachyonic preheating of the Universe, when the potential energy
of the inflaton is transfered into Standard Model particles. With the proper
amount of CP-violation present, the observed baryon number asymmetry can be
reproduced. Within this framework of Cold Electroweak Baryogenesis, we study
the dependence of the generated baryon asymmetry on the speed of the quenching
transition. We find that there is a separation between ``fast'' and ``slow''
quenches, which can be used to put bounds on the allowed Higgs-inflaton
coupling. We also clarify the strong Higgs mass dependence of the asymmetry
reported in a companion paper (hep-ph/0604263).


title: MSGUT : the next Avtar

abstract:
  We report the viability of the Type I seesaw mechanism in 3 generation
renormalizable SO(10) GUTs based on the $\mathbf{{210-10-\oot-126-120}}$ Higgs
system. The $\mathbf{120}$ -plet and $ \mathbf{10}$-plet Higgs fit charged
fermion masses while small $\mathbf{\bar{126}} $-plet couplings enhance Type I
seesaw neutrino masses to viable values and make the fit to light fermions
accurate. For the 3 generation CP conserving case we display accurate charged
fermion fits ($\chi^2_{tot} < .2 $) which imply Type I neutrino masses $10^2-
10^3$ times larger than the $\mathbf{10-\bar{126}}$ scenario. The correct ratio
of neutrino mass squared splitting, large($\theta_{23}^{PMNS}$) and
small($\theta_{13}^{PMNS}$) mixing angle are achievable. $\theta_{12}^{PMNS}$
is however small and indicates that -as in the Type I $\mathbf{10-\oot}$ case -
a fully realistic fit to the lepton mixing data also \emph{requires} CP
violation.


title: Top quark signatures of Higgsless models

abstract:
  In these proceedings I describe the use of tree level unitarity to constrain
top quark signatures of Higgsless electroweak models and discuss implications
for collider phenomenology.


title:
New look at the $[{\bf 70},1^-]$ baryon multiplet in the $1/N_c$
  expansion

abstract:
  So far, the masses of excited states of mixed orbital symmetry and in
particular those of nonstrange $[{\bf 70},1^-]$ baryons derived in the $1/N_c$
expansion were based on the separation of a system of $N_c$ quarks into a
symmetric core and an excited quark. Here we avoid this separation and show
that an advantage of this new approach is to substantially reduce the number of
linearly independent operators entering the mass formula. A novelty is that the
isospin-isospin term becomes as dominant in $\Delta$ as the spin-spin term in
$N$ resonances.


title: Uncovering the Nature of the Weak Interaction

abstract:
  This brief review traces the development of our understanding of the weak
interactions, highlighting Jim Cronin's contributions through his studies of
strange particle decays and the developments to which they led.


title: Single-spin asymmetry from pomeron-odderon interference

abstract:
  The transverse single-spin asymmetry A_N observed in high energy
proton-proton collisions p^\uparrow p \to pi X has been found to increase with
the momentum fraction x_F of the pion up to the largest measured x_F \sim 0.8,
where A_N \simeq 40%. We consider the possibility that the asymmetry is due to
a non-perturbatively generated spin-flip coupling in soft rescattering on the
target proton. We demonstrate using perturbation theory that a non-vanishing
asymmetry can be generated through interference between exchanges of even and
odd charge conjugation provided both helicity flip and non-flip couplings
contribute. Pomeron and odderon exchange can thus explain the energy
independence of the asymmetry and predicts that the asymmetry should persist in
events with large rapidity gaps.


title: Pion Polarizabilities

abstract:
  Recent experimental pion polarizability data are reviewed and analyzed. Data
on the radiative \pi^+ meson photoproduction on the proton at MAMI has been
used to determine the difference of the electric and magnetic dipole
polarizabilities of the charged pion. Fits of the experimental data to the
total cross sections of the processes \gamma\gamma->\pi^0\pi^0 and
\gamma\gamma->\pi^\pm\pi^\pm in the energy region from threshold to 2250 MeV
and 2500 MeV, respectively, have been carried out using dispersion relations
with subtractions for the invariant helicity amplitudes, where the dipole and
the quadrupole polarizabilities of \pi^0 and \pi^\pm are free parameters. These
fits have allowed ones to find the sum and the difference of the electric and
magnetic dipole and quadrupole polarizabilities of the pions. These data are
compared with the dispersion sum rules and ChPT calculations. The value of the
difference of the charged pion dipole polarizabilities found from the fit is in
a good agreement with the results obtained at MAMI (2005), in Serpukhov (1983)
and Lebedev Physical Institute (1984). However, all these values deviate from
the recent calculations in the framework of ChPT.


title: Gauge Messenger Models

abstract:
  We consider gauge messenger models in which X and Y gauge bosons and gauginos
are messengers of supersymmetry breaking. In simple gauge messenger models, all
the soft parameters except mu and Bmu are calculated in terms of a single scale
parameter M_SUSY which is proportional to F/M_GUT. Unique prediction on dark
matter in gauge messenger models is discussed. (Based on hep-ph/0601036 and
hep-ph/0607169)


title: Z' Phenomenology and the LHC

abstract:
  A brief pedagogical overview of the phenomenology of Z' gauge bosons is
presented. Such particles can arise in various electroweak extensions of the
Standard Model (SM). We provide a quick survey of a number of Z' models, review
the current constraints on the possible properties of a Z' and explore in
detail how the LHC may discover and help elucidate the nature of these new
particles. We provide an overview of the Z' studies that have been performed by
both ATLAS and CMS. The role of the ILC in determining Z' properties is also
discussed.


title: KK Gravitons and Unitarity Violation in the Randall-Sundrum Model

abstract:
  We show that perturbative unitarity for $W_LW_L$ scattering places
significant constraints on the Randall-Sundrum theory with two 3-branes, with
matter confined to the TeV brane. The exchange of massive 4D Kaluza-Klein
gravitons leads to amplitudes growing linearly with the CM energy squared.
Summing over KK gravitons up to a scale $\lbar$ and testing unitarity at $\sqrt
s=\lbar$, one finds that unitarity is violated for $\lbar$ below the 'naive
dimensional analysis' scale, $\Lambda_{NDA}$. We evaluate $\lbar$ as a function
of the curvature ratio $m_0/M_{Planck}$ for the pure gravity theory. We then
demonstrate that unitarity need not be violated at $\lbar$ in the presence of a
heavy Higgs boson. In fact, much larger Higgs masses are consistent with
unitarity than if no KK gravitons are present. Observation of the mass and
width (or cross section) of one or more KK gravitons at the LHC will directly
determine $m_0/M_{Planck}$ and the scale $\hat \Lambda$ specifying the
couplings of matter to the KK gravitons. With this information in hand and a
measurement of the Higgs boson mass, one can determine the precise scale
$\lbar$ below which unitarity will remain valid.


title: Status of Strangeness-Flavor Signature of QGP

abstract:
  Is the new state of matter formed in relativistic heavy ion collisions the
deconfined quark--gluon plasma? We survey the status of several strange hadron
observables and discuss how these measurement help understand the dense
hadronic matter.


title: Light Cone Quantization and Savvidy Instability in Dense Quark Matter

abstract:
  Solving instability of Savvidy vacuum in QCD is a longstanding problem. Using
light cone quantization we analyze the problem not in the real confining vacuum
but in dense quark matter where gluons interact weakly with each other. We find
a stable ferromagnetic ground state of gluons which carry a single longitudinal
momentum. Their states are composed as if they are confined in a two
dimensional quantum well. This supports our previous result that gluons form a
quantum Hall state in dense quark matter.


title:
On radiative corrections for unpolarized electron proton elastic
  scattering

abstract:
  A statistical analysis of the elastic unpolarized electron proton scattering
data shows that, at large momentum transfer, the size and the $\epsilon$
dependence of the radiative corrections, as traditionally calculated and
applied, may induce large correlations of the parameters of the Rosenbluth fit,
which prevent a correct extraction of the electric proton form factor. Using
the electron QED structure (radiation) function approach the cross section of
elastic electron-proton scattering in leading and next-to leading
approximations is calculated and expressed as a correction to the Born cross
section, which is different for the electric and the magnetic contribution.
When properly applied to the data, it may give the solution to the problem of
the discrepancy of the polarized and unpolarized results on electron proton
scattering.


title: Bs-->K+K- and Bs-->K0 anti-K0 Decays within Supersymmetry

abstract:
  We compute the supersymmetric (SUSY) contributions to the observables in
Bs-->K+K- and Bs-->K0 anti-K0 decays. The hadronic parameters in the
standard-model (SM) amplitudes are obtained from the Bd-->K0 anti-K0 decay
using a recent approach that combines flavor SU(3) symmetry and a controlled
input from QCD factorization. The latest experimental data for BR(Bs-->K+K-) is
in agreement with the SM prediction. We study how the branching ratios and the
direct and mixing-induced CP asymmetries of both Bs-->KK decay modes are
affected with the inclusion of SUSY, after imposing constraints from BR(B--> Xs
gamma), B--> pi K and Delta Ms over the parameter space. While the branching
ratios remain unaffected by SUSY, we identify the CP asymmetries of the Bs-->KK
decays as the most promising observables to look for large deviations from the
SM.


title: Neutralino dark matter in the MSSM with CP violation

abstract:
  In the MSSM, the presence of CP phases can have a significant impact on the
neutralino relic abundance. These phase effectsare on the one hand due to
shifts in the masses, on the other hand due to modifications of the couplings.
Typical variations in Omega h^2 solely from modifications in the couplings are
of order 10%-100%.


title:
From di-hadron correlations to parton intrinsic transverse momentum in
  proton-proton collisions

abstract:
  Di-hadron correlations in proton-proton collisions at s^1/2 = 200 GeV are
interpreted in terms of a fragmentation width and a momentum imbalance. A
fragmentation width of 580 +- 50 GeV/c is obtained, and the momentum imbalance
gives an `intrinsic' transverse momentum width of partons in the proton of 2.6
+- 0.2 GeV/c.


title:
Transverse single spin asymmetries in inclusive deep-inelastic
  scattering

abstract:
  In inclusive deep-inelastic lepton-hadron scattering multi-photon exchange
between the leptonic and the hadronic part of the process causes single spin
asymmetries. The asymmetries exist for a polarized target as well as a
polarized incoming or outgoing lepton, if the polarization vector has a
component transverse with respect to the reaction plane. The spin dependent
parts of the single polarized cross sections are suppressed like $\alpha_{em}
m_{pol}/Q$ - where $m_{pol}$ denotes the mass of the polarized particle -
compared to the leading terms of the cross section for unpolarized or
double-polarized deep-inelastic scattering. Both the target and the beam spin
asymmetry are evaluated in the parton model. In the calculation only
quark-quark correlators are included. While this approximation turns out to be
justified for the lepton spin asymmetries, it is not sufficient for the target
asymmetry.


title:
RS model with a small curvature and gravity effects in e+e- annihilation
  into leptons at the LC

abstract:
  The Randall-Sundrum (RS) model with a small curvature is considered. The mass
spectrum of Kaluza-Klein (KK) gravitons in such a scheme is similar (although
not equivalent) to that in a model with one extra dimension in a flat metric.
The gravity effects in the processes $e^+e^- \to e^+e^-$ and $e^+e^-
\to\mu^+\mu^-$ at the collision energy 1 TeV are presented. Our calculations
are based on the previously obtained formula for virtual graviton contributions
which takes into account both a discrete character of the mass spectrum and
nonzero widths of the KK gravitons.


title: Axinos as Cold Dark Matter

abstract:
  The connection of Dark Matter to our particle physics model is still one of
the open cosmological questions. In these proceedings I will argue that axinos
can be successful Cold Dark Matter candidates in models with Supersymmetry and
the Peccei-Quinn solution of the strong CP problem. If they are the Lightest
Supersymmetric Particle (LSP), they can be produced in the right abundance by
thermal scatterings and out of equilibrium decays of the Next-to-Lightest
Supersymmetric Particles (NLSPs). Moreover if the NLSPs are charged, their
decay could help us understand which is the LSP, e.g. between axino and
gravitino.


title: Hadron Spectroscopy and Structure from AdS/CFT

abstract:
  The AdS/CFT correspondence between conformal field theory and string states
in an extended space-time has provided new insights into not only hadron
spectra, but also their light-front wavefunctions. We show that there is an
exact correspondence between the fifth-dimensional coordinate of anti-de Sitter
space and a specific impact variable which measures the separation of the
constituents within the hadron in ordinary space-time. This connection allows
one to predict the form of the light-front wavefunctions of mesons and baryons,
the fundamental entities which encode hadron properties and scattering
amplitudes. A new relativistic Schrodinger light-front equation is found which
reproduces the results obtained using the fifth-dimensional theory. Since they
are complete and orthonormal, the AdS/CFT model wavefunctions can be used as an
initial ansatz for a variational treatment or as a basis for the
diagonalization of the light-front QCD Hamiltonian. A number of applications of
light-front wavefunctions are also discussed.


title: Proton Decay in Teravolt Unification

abstract:
  Model building based on abelian quiver gauge theories gives models which
resemble trinification, originally proposed with yottavolt unification.
However, unification occurs in the teravolt range so proton decay must be
completely excluded in the scalar sector. It is straightforward to accomplish
this by a discrete symmetry which is a generalized baryon number B. Unlike in
trinification, this is possible because quarks and leptons acquire masses from
relevant operators which appear in four-dimensional conformal symmetry
breaking.


title: New relations between DIS sum rules

abstract:
  New relations between Bjorken polarized, Gross-Llewellyn Smith and Bjorken
unpolarized sum rules are proposed. They are based on the ``universality'' of
the perturbative and non-perturbative $\rm{1/Q^2}$ contributions to these sum
rules. The letter facts can be deduced from the corresponding renormalon
calculations. The similarity of $\rm{1/Q^2}$ corrections are checked by
inspecting the numerical results obtained within several approaches.The
discussed relations are in agreement with existing experimental data.Some
possible new phenomenological applications are mentioned including estimates of
not yet measured Bjorken unpolarized sum rule.


title:
Unconventional Neutrino Mass Generation, Neutrinoless Double Beta
  Decays, and Collider Phenomenology

abstract:
  We study a model in which lepton number violation is solely triggered by a
dimension 4 hard breaking term in the scalar potential. A minimal model which
contains a SU(2) triplet with hypercharge Y=2, and a pair of singlet doubly
charged scalar fields in addition to the Standard Model (SM) Higgs doublet is
constructed. The model is technically natural in the sense that lepton number
is preserved in the limit that the hard term vanishes. SM phenomenology
restricts the vacuum expectation value of the triplet scalar field $v_T<5.78$
GeV. Neutrino masses controlled by $v_T$ are generated at the two loop level
and are naturally to the sub-eV range. In general they exhibit normal hierarchy
structure. Here the neutrino mass term does not dominate neutrinoless double
beta decays of nuclei. Instead the short distance physics with doubly charged
Higgs exchange gives the leading contribution. We expect weak scale singly and
doubly charged Higgs bosons to make their appearances at the LHC and the ILC.


title:
New interpretation of matter-antimatter asymmetry based on branes and
  possible observational consequences

abstract:
  Motivated by the AMS project, we assume that after the Big Bang or inflation
epoch, antimatter was repelled onto one brane which is separated from our brane
where all the observational matter resides. It is suggested that CP may be
spontaneously broken, the two branes would correspond to ground states for
matter and antimatter respectively. Generally a complex scalar field which is
responsible for the spontaneous CP violation, exists in the space between the
branes and causes a repulsive force against the gravitation. A possible
potential barrier prevents the mater(antimatter) particles to enter the space
between two branes. However, by the quantum tunnelling, a sizable anti-matter
flux may come to our brane. In this work by considering two possible models,
i.e. the naive flat space-time and Randall-Sundrum models and using the
observational data on the visible matter in our universe as inputs, we derive
the antimatter flux which would be observed by the AMS detector.


title: Penguin pollution in the B^0 -> J/psi K_S decay

abstract:
  We present the most complete analysis of the penguin correction to the
extraction of the standard-model parameter sin(2\phi_1) from the B^0 -> J/psi
K_S decay up to leading power in 1/m_b and to next-to-leading order in
\alpha_s, \phi_1 being the weak phase, m_b the b quark mass, and \alpha_s the
strong coupling constant. The deviation \Delta S_{J/psi K_S} of the
mixing-induced CP asymmetry from sin(2\phi_1) and the direct CP asymmetry
A_{J/psi K_S} are both found to be of O(10^{-3}) in a formalism that combines
the QCD-improved factorization and perturbative QCD approaches. The above
results, different from those of O(10^{-4}) and of O(10^{-2}) obtained in the
previous calculations, provide an important standard-model reference for
verifying new physics from the B^0 -> J/psi K_S data.


title:
Neutral Color Superconductivity Including Inhomogeneous Phases at Finite
  Temperature

abstract:
  We investigate neutral quark matter with homogeneous and inhomogeneous color
condensates at finite temperature in the frame of an extended NJL model. By
calculating the Meissner masses squared and gap susceptibility, the uniform
color superconductor is stable only in a temperature window close to the
critical temperature and becomes unstable against LOFF phase, mixed phase and
gluonic phase at low temperatures. The introduction of the inhomogeneous phases
leads to disappearance of the strange intermediate temperature 2SC/g2SC and
changes the phase diagram of neutral dense quark matter significantly.


title: Charmonium dissociation by mesons in heavy-ion collisions

abstract:
  The charmonium dissociation by mesons in relativistic heavy-ion reactions is
analyzed within the Regge approach. It is shown that the inclusion of the
initial and final state interactions in the dissociation of J/Psi to bar{D}* D*
close to threshold increases the cross section significantly and can not be
neglected in comparison to the total dissociation rate. This is due to resonant
bar{D}*-D* interactions in sqrt{s} close to the masses of the Psi(4.04) and
Psi(4.16) mesons. We also investigate thermal effects of the (c bar{c}) width
for such processes in the medium. All these effects change both the magnitude
and the shape of the cross section as a function of sqrt{s}. The results
obtained should be applied in the analysis of open and hidden charm production
in heavy-ion collisions.


title:
Collective Resonances in the Soliton Model Approach to Meson--Baryon
  Scattering

abstract:
  The proper description of hadronic decays of baryon resonances has been a
long standing problem in soliton models for baryons. In this talk I present a
solution to this problem in the three flavor Skyrme model that is consistent
with large-Nc consistency conditions. As an application I discuss hadronic
pentaquark decays and show that predictions based on axial current matrix
elements are erroneous.


title: Hyperspherical harmonic formalism for tetraquarks

abstract:
  We present a generalization of the hyperspherical harmonic formalism to study
systems made of quarks and antiquarks of the same flavor. This generalization
is based on the symmetrization of the $N-$body wave function with respect to
the symmetric group using the Barnea and Novoselsky algorithm. Our analysis
shows that four-quark systems with non-exotic $2^{++}$ quantum numbers may be
bound independently of the quark mass. $0^{+-}$ and $1^{+-}$ states become
attractive only for larger quarks masses.


title: Study of semileptonic and nonleptonic decays of the $B_c^-$ meson

abstract:
  We evaluate semileptonic and two--meson nonleptonic decays of the $B_c^-$
meson in the framework of a nonrelativistic quark model. The former are done in
spectator approximation using one--body current operators at the quark level.
Our model reproduces the constraints of heavy quark spin symmetry obtained in
the limit of infinite heavy quark mass. For the two--meson nonleptonic decays
we work in factorization approximation. We compare our results to the ones
obtained in different relativistic approaches.


title: Understanding open-charm mesons

abstract:
  We present a theoretical framework that accounts for the new $D_J$ and
$D_{sJ}$ mesons measured in the open-charm sector. These resonances are
properly described if considered as a mixture of conventional $P-$wave
quark-antiquark states and four-quark components. The narrowest states are
basically $P-$wave quark-antiquark mesons, while the dominantly four-quark
states are shifted above the corresponding two-meson threshold. We study the
electromagnetic decay widths as basic tools to scrutiny their nature.


title: Resonances and the Weinberg--Tomozawa 56-baryon --35-meson interaction

abstract:
  Vector meson degrees of freedom are incorporated into the
  Weinberg-Tomozawa (WT) meson-baryon chiral Lagrangian by using a scheme which
relies on spin--flavor SU(6) symmetry. The corresponding Bethe-Salpeter
approximation successfully reproduces previous SU(3)--flavor WT results for the
lowest-lying s--wave negative parity baryon resonances, and it also provides
some information on the dynamics of the heavier ones. Moreover, it also
predicts the existence of an isoscalar spin-parity $\frac32^-$ $K^*N$ bound
state (strangeness +1) with a mass around 1.7--1.8 GeV, unstable through $K^*$
decay. Neglecting d-wave KN decays, this state turns out to be quite narrow
($\Gamma \le 15$ MeV) and it might provide clear signals in reactions like
$\gamma p \to \bar K^0 p K^+\pi^-$ by looking at the three body $p K^+\pi^-$
invariant mass.


title:
On the determinations of the size and shape of the interaction region
  from Bose-Einstein correlations

abstract:
  Determinations of the size and shape of the interaction region from
k-particle (k=1,2,...) momentum distributions of identical particles are
analyzed. The full group of transformations changing the single particle
density matrix without affecting any of the measurable momentum distributions
is identified. The corresponding uncertainties in the inferred parameters of
the interaction region are discussed.


title: Photon production by charged particles in narrow optical fibers

abstract:
  A charged particle passing through or by an optical fiber induces emission of
light guided by the fiber. The formula giving the spontaneous emission
amplitude are given in the general case when the particle trajectory is not
parallel to the fiber axis. At small angle, the photon yield grows like the
inverse power of the angle and in the parallel limiting case the fiber
Cherenkov effect studied by Bogdankevich and Bolotovskii is recovered. Possible
application to beam diagnostics are discussed, as well as resonance effects
when the particle trajectory or the fiber is bent periodically.


title: Power law in a gauge-invariant cut-off regularisation

abstract:
  We study one-loop quantum corrections of a compactified Abelian 5d gauge
field theory. We use a cut-off regularisation procedure which respects the
symmetries of the model, i.e. gauge invariance, exhibits the expected
power-like divergences and therefore allows the derivation of power-law
behavior of the effective 4d gauge coupling in a coherent manner.


title: Doubly heavy quark baryon spectroscopy and semileptonic decay

abstract:
  Working in the framework of a nonrelativistic quark model we evaluate the
spectra and semileptonic decay widths for the ground state of doubly heavy
$\Xi$ and $\Omega$ baryons. We solve the three-body problem using a variational
ansatz made possible by the constraints imposed by heavy quark spin symmetry.
In order to check the dependence of our resultson the inter-quark interaction
we have used five different quarkquark potentials which include Coulomb and
hyperfine terms coming fromone-gluon exchange, plus a confining term. Our
results for the spectra are in good agreement with a previous calculation done
using a Faddeev approach. For the semileptonic decay our results for the total
decay widths are in a good agreement with the ones obtained within a
relativistic quark model in the quark-diquark approximation.


title: On two- and three-body descriptions of hybrid mesons

abstract:
  Hybrid mesons are exotic mesons in which the color field is not in its ground
state. Their understanding deserves interest from a theoretical point of view,
because it is intimately related to nonperturbative aspects of QCD. In this
work, we analyze and compare two different descriptions of hybrid mesons,
namely a two-body $q\bar q$ system with an excited string, or a three-body
$q\bar q g$ system. In particular, we show that the constituent gluon approach
is equivalent to an effective excited string in the heavy hybrid sector.
Instead of a numerical resolution, we use the auxiliary field technique. It
allows to find simplified analytical mass spectra and wave functions, and still
leads to reliable qualitative predictions. We also investigate the light hybrid
sector, and found a mass for the lightest hybrid meson which is in satisfactory
agreement with lattice QCD and other effective models.


title: Extra-weakly Interacting Dark Matter

abstract:
  We investigate a new type of dark matter with couplings to ordinary matter
naturally suppressed by at least one order of magnitude compared to weak
interactions. Despite the extra-weak interactions massive particles of this
type (XWIMPs) can satisfy the WMAP relic density constraints due to
coannihilation if their masses are close to that of the lightest state of the
MSSM. The region in the parameter space of a suitably extended mSUGRA model
consistent with the WMAP3 constraints on XWIMPs is determined. Plots for
sparticles masses are given which can be subject to test at the LHC. We also
discuss the sensitivity of the analysis to the top mass. As an example for an
explicit model we show that such a form of dark matter can arise in certain
$Z'$ extensions of the MSSM. Specifically we consider an abelian extension with
spontaneous gauge symmetry breaking via Fayet-Iliopoulos D-terms in the hidden
sector. The LSP of the full model arises from the extra $U(1)_X$ sector with
extra-weak couplings to Standard Model particles due to experimental
constraints. With R-parity conservation the new XWIMP is a candidate for cold
dark matter. In a certain limit the model reduces to the \st extension of the
MSSM without a Higgs mechanism, and wider ranges of models with similar
characteristics are easy to construct.


title:
MSSM flat direction inflation: slow roll, stability, fine tunning and
  reheating

abstract:
  We consider low scale slow roll inflation driven by the gauge invariant flat
directions {\bf udd} and {\bf LLe} of the Minimally Supersymmetric Standard
Model at the vicinity of a saddle point of the scalar potential. We study the
stability of saddle point and the slow roll regime by considering radiative and
supergravity corrections. The latter are found to be harmless, but the former
require a modest finetuning of the saddle point condition. We show that while
the inflaton decays almost instantly, full thermalization occurs late,
typically at a temperature $T\approx 10^{7}$ GeV, so that there is no gravitino
problem. We also compute the renormalization group running of the inflaton mass
and relate it to slepton masses that may be within the reach of LHC and could
be precisely determined in a future Linear Collider experiment.


title:
CP violation and electric-dipole-moment at low energy $\tau$ production
  with polarized electrons

abstract:
  The new proposals for high luminosity B/Flavor factories, near and on top of
the $\Upsilon$ resonances, allow for a detailed investigation of CP-violation
in the $\tau$-pair production. In particular, bounds on the tau electric dipole
moment can be obtained from genuine CP-odd observables related to the
$\tau$-pair production. We perform an independent analysis from low energy (10
GeV) data by means of linear spin observables. We show that, for a
longitudinally polarized electron beam, a CP-odd asymmetry, associated to the
normal polarization term, can be measured at these low energy facilities both
at resonant and non resonant energies. In this way, stringent and independent
bounds to the tau electric dipole moment, which are orders of magnitude below
other high or low energy bounds, can be obtained.


title:
The NNLO non-singlet QCD analysis of parton distributions based on
  Bernstein polynomials

abstract:
  A non-singlet QCD analysis of the structure function $xF_3$ up to NNLO is
performed based on the Bernstein polynomials approach. We use recently
calculated NNLO anomalous dimension coefficients for the moments of the $xF_3$
structure function in $\nu N$ scattering. In the fitting procedure, Bernstein
polynomial method is used to construct experimental moments from the $xF_3$
data of the CCFR collaboration in the region of $x$ which is inaccessible
experimentally. We also consider Bernstein averages to obtain some unknown
parameters which exist in the valence quark densities in a wide range of $x$
and $Q^2$. The results of valence quark distributions up to NNLO are in good
agreement with the available theoretical models. In the analysis we determined
the QCD-scale $\Lambda^ {\bar{MS}}_{QCD, N_{f}=4}=211$ MeV (LO), 259 MeV (NLO)
and 230 MeV (NNLO), corresponding to $\alpha_s(M_Z^2)=0.1291$ LO,
$\alpha_s(M_Z^2)=0.1150$ NLO and $\alpha_s(M_Z^2)=0.1142$ NNLO. We compare our
results for the QCD scale and the $\alpha_s(M_Z^2)$ with those obtained from
deep inelastic scattering processes.


title:
Improved analysis of moments of F3 in neutrino-nucleon scattering using
  the Bernstein polynomial method

abstract:
  We use recently calculated next-to-next-to-leading order (NNLO) anaomalous
dimension coefficients for the moments of the xF_3 structure function in
neutrino- nucleon scattering, together with the corresponding three-loop Wilson
coefficients, to obtain improved QCD predictions for both odd and even moments.
To investigate the issue of renormalization scheme dependence the Complete
Renormalization Group Improvement (CORGI) approach is used, in which all
dependence on renormalization or factorization scales is avoided by a complete
resummation of RG-predictable scale logarithms. We also consider predictions
using the method of effective charges and compare with the standard ``physical
scale'' choice. The Bernstein polynomial method is used to construct
experimental moments from the xF_3 data of the CCFR collaboration insensitive
to the data in the region of x which is inaccessible experimentally. Direct
fits for \Lambda^(5)MSbar (\alpha_s(M_Z)) are performed. The CORGI fits
including target mass corrections give a value \alpha_s(M_Z)=0.119+/-0.002,
nicely consistent with the world average. The effective charge and physical
scale fits give slightly smaller values which are still consistent within the
errors.


title: Excited $[{\bf 70},\ell^+]$ baryon resonances in large $N_c$ QCD

abstract:
  We summarize results obtained in the $1/N_c$ expansion method for the masses
of baryon resonances belonging to the $[{\bf 70},\ell^+]$ multiplet. They
represent an extension of our previous studies from two to three flavors. A
better approach to mixed symmetric states of any angular momentum and parity is
also outlined.


title: Lattice approach to threshold states

abstract: I review lattice studies of the hadrons: $D_s(2317)$, X(3872), and Y(4260).


title:
Running-coupling effects in the triple-differential charmless
  semileptonic decay width

abstract:
  We compute the fully-differential B -> X_u l nu decay width to all orders in
perturbation theory in the large-beta0 limit. Each of the five structure
functions that build the hadronic tensor is expressed as a Borel integral,
summing up O(CF beta0^{n-1} alpha_s^n) corrections for any n. We derive
analytic expressions for the Borel transforms of both real and virtual diagrams
with a single dressed gluon, and perform an all-order infrared subtraction,
where the Borel parameter serves also as an infrared regulator. Expanding the
result we recover the known triple-differential NLO coefficient, and obtain an
explicit expression for the O(CF beta0 alpha_s^2) triple-differential NNLO
correction. This result can be used to improve the determination of |V_{ub}|
from inclusive B -> X_u l nu measurements at the B factories with a variety of
kinematic cuts.


title:
Model independent analysis of polarization effects in elastic electron
  deuteron scattering in presence of two--photon exchange

abstract:
  The general spin structure of the matrix element, taking into account the
two--photon exchange contribution, for the elastic electron (positron)
--deuteron scattering has been derived using general symmetry properties of the
hadron electromagnetic interaction, such as P--, C-- and T--invariances as well
as lepton helicity conservation in QED at high energy. Taking into account also
crossing symmetry, the amplitudes of $e^{\mp}d-$scattering can be parametrized
in terms of fifteen real functions. The expressions for the differential cross
section and for all polarization observables are given in terms of these
functions. We consider the case of an arbitrary polarized deuteron target and
polarized electron beam (both longitudinal and transverse). The transverse
polarization of the electron beam induces a single--spin asymmetry which is
non--zero in presence of two--photon exchange. It is shown that elastic
deuteron electromagnetic form factors can still be extracted in presence of two
photon exchange, from the measurements of the differential cross section and of
one polarization observable (for example, the tensor asymmetry) for electron
and positron deuteron elastic scattering, in the same kinematical conditions.


title: Heavy Quarkonia from Classical SU(3) Yang-Mills Configurations

abstract:
  A generalized Cho-Faddeev-Niemi ansatz for SU(3) Yang-Mills is investigated.
The corresponding classical field equations are solved for its simplest
parametrization. From these solutions it is possible to define a confining
central non-relativistic potential used to study heavy quarkonia. The
associated spectra reproduces the experimental spectra with an error of less
than 3% for charmonium and 1% for bottomonium. Moreover, the recently
discovered new charmonium states can be accomodate in the spectra, keeping the
same level of precision. The leptonic width show good agreement with the recent
measurements. The charmonium and bottomonium E1 electromagnetic transitions
widths are computed and compared with the experimental values.


title: The logarithmic contribution to the QCD static energy at NNNNLO

abstract:
  Using pNRQCD and known results for the field strength correlator, we
calculate the ultrasoft contribution to the QCD static energy of a
quark-antiquark pair at short distances at NNNNLO in alpha_s. At the same
order, this provides the logarithmic terms of the singlet static potential in
pNRQCD and the log alpha_s terms of the static energy.


title: Constraints on mSUGRA from isospin asymmetry in B -> K* gamma

abstract:
  We study the isospin asymmetry as an observable in exclusive B -> K* gamma
decay that can be used to study the effects of physics beyond the Standard
Model. We present predictions for isospin asymmetry in Supersymmetric extension
of the Standard Model with minimal flavor violation, using parameter values
allowed by current experimental constraints. This observable can provide very
tight constraints on the mSUGRA parameter space.


title:
Applications of effective field theories to the strong interactions of
  heavy quarks

abstract:
  We apply effective field theory techniques to study several heavy quark
systems. The topics analysed include the singlet static QCD potential,
anomalous dimensions in SCET and a comprehensive study of semi-inclusive
radiative heavy quarkonium decays.


title: Relativistic NJL Model with Light and Heavy Quarks

abstract:
  We study the Nambu-Jona-Lasinio model with light and heavy quarks in a
relativistic approach. We emphasize relevant regularization issues as well as
the transition from light to heavy quarks. The approach of the electromagnetic
meson form factor to the Isgur-Wise function in the heavy quark limit is also
discussed.


title: Lepton flavor violating radion decays in the Randall-Sundrum scenario

abstract:
  We predict the branching ratios of lepton flavor violating radion decays r ->
e^{\pm} \mu^{\pm}, r -> e^{\pm} \tau^{\pm} and r -> \mu^{\pm} \tau^{\pm} in the
two Higgs doublet model, in the framework of the Randall Sundurum scenario. We
observe that the branching ratios of the processes we study are at most at the
order of 10^{-8} for the small values of radion mass and it decreases with the
increasing values of m_r. Among the LFV decays we study, the r -> \tau^{\pm}
\mu^{\pm} decay would be the most suitable one to measure its branching ratio.


title:
The emergence of the Cabibbo angle in non-degenerate coupled systems of
  fermions

abstract:
  Investigating, in direct continuation of our previous paper hep-ph/0606303
the implications of the non-unitarity of mixing matrices for non-degenerate
coupled systems that we demonstrated there, we examine more accurately the
vicinity of Cabibbo-like mixing in quantum field theory. We show that it is
possible to preserve one of its main features, namely that, in the space of
mass eigenstates, the two requirements -- of universality for weak diagonal
currents and -- of the absence of their non-diagonal counterparts, although not
fulfilled separately any more, can however reduce to a single condition for a
unique mixing angle theta\_c. This leads to tan (2 theta\_c)=+/- 1/2, or cos
theta\_c \approx 0.9732, only 7/10000 away from experimental results. No mass
ratio appears in the argumentation.


title: $ B \to (\rho, \omega)\gamma$ Decays and CKM Phenomenology

abstract:
  We review and update the branching ratios for the $B \to (\rho,\omega)
\gamma$ decays, calculated in the QCD factorization approach in the
next-to-leading order (NLO) in the strong coupling $\alpha_s$ and to leading
power in $\Lambda_{\rm QCD}/m_b$. The corrections take into account the vertex,
hard-spectator and annihilation contributions and are found to be large.
Theoretical expectations for the branching ratios, CP-asymmetry, isospin- and
$SU (3)_{\rm F}$-violating ratios in the $B \to \rho\gamma$ and $B \to
\omega\gamma$ decays are presented and compared with the available data.


title: Analyzing dynamical gluon mass generation

abstract:
  We study the necessary conditions for obtaining infrared finite solutions
from the Schwinger-Dyson equation governing the dynamics of the gluon
propagator. The equation in question is set up in the Feynman gauge of the
background field method, thus capturing a number of desirable features. Most
notably, and in contradistinction to the standard formulation, the gluon
self-energy is transverse order-by-order in the dressed loop expansion, and
separately for gluonic and ghost contributions. Various subtle field-theoretic
issues, such as renormalization group invariance and regularization of
quadratic divergences, are briefly addressed. The infrared and ultraviolet
properties of the obtained solutions are examined in detail, and the allowed
range for the effective gluon mass is presented.


title: Correlations at RHIC and the Clustering of Color Sources

abstract:
  We present our results on transverse momentum fluctuations and multiplicity
fluctuations in the framework of the clustering of color sources. In this
approach, elementary color sources -strings- overlap forming clusters, so the
number of effective sources is modified. These clusters decay into particles
with mean transverse momentum that depends on the number of elementary sources
that conform each cluster and the area occupied by the cluster. We find a
non-monotonic dependence of the $p_T$ and multiplicity fluctuations with the
number of participants. In our approach, the physical mechanism responsible of
these fluctuations is the same: the formation of clusters of strings that
introduces correlations between the produced particles.


title: Flat direction MSSM (A-term) Inflation

abstract:
  The Minimal Supersymmetry Standard Model contains several hundreds of D- and
F-flat directions that are lifted by soft susy breaking terms as well as by
non-renormalizable terms. In a recent paper we find that only two of these
directions, {\bf LLe} and {\bf udd} can accommodate inflation. The model
predicts more than $10^3$ e-foldings with an inflationary scale of $H_{\rm
inf}\sim 1$ GeV, provides a tilted spectrum compatible with WMAP3, and a
negligible tensor perturbation. The reheating temperature could be as low as
$T_{rh}\sim 1$ TeV. The model is stable under radiative as well as supergravity
corrections, although a significant finetunning has to be imposed on the ratio
of two parameters of the model. The RGE equations allow us to relate the model
parameters with slepton and gaugino masses explorable in the LHC, while the
neutralino in this model could well be within reach of present dark matter
searches in the laboratory.


title:
Leading and higher twists in proton, neutron and deuteron unpolarized
  structure functions

abstract:
  We summarize the results of a recent global analysis of proton and deuteron
F2 structure function world data performed over a large range of kinematics,
including recent measurements done at JLab with the CLAS detector. From these
data the lowest moments (n <= 10) of the unpolarized structure functions are
determined with good statistics and systematics. The Q**2 evolution of the
extracted moments is analyzed in terms of an OPE based twist expansion, taking
into account soft-gluon effects at large x. A clean separation among the
Leading and Higher-Twist terms is achieved. By combining proton and deuteron
measurements the lowest moments of the neutron F2 structure function are
determined and its leading twist term is extracted. Particular attention is
paid to nuclear effects in the deuteron, which become increasingly important
for the higher moments. Our results for the non-singlet, isovector (p - n)
combination of the leading twist moments are used to test recent lattice
simulations. We also determine the lowest few moments of the higher twist
contributions, and find these to be approximately isospin independent,
suggesting the possible dominance of ud correlations over uu and dd in the
nucleon.


title:
Probing SUSY beyond the reach of LEP2 at the Fermilab Tevatron: low
  |M_3| dark matter models

abstract:
  In supersymmetric models where the magnitude of the GUT scale gaugino mass
parameter M_3 is suppressed relative to M_1 and M_2, the lightest neutralino
can be a mixed higgsino-bino state with a thermal relic abundance in agreement
with the WMAP central value for \Omega_{\rm CDM} h^2 and consistent with all
other phenomenological constraints. In these models, the gluino can be as light
as 200 GeV without conflicting with the LEP2 bounds on the chargino mass. Thus,
gluino pair production can be accessible at the Fermilab Tevatron at high
rates. In this framework, gluinos decay radiatively with a large branching
fraction to a gluon plus a neutralino. We find that experiments at the Fermilab
Tevatron, with 5 fb^{-1} of integrated luminosity, will be sensitive to gluino
pair production in the m_{\tg}\sim 200-350 GeV range via the multi-jet
+etmissing and multi-jet +\ell^+\ell^- + etmissing channels at the 5\sigma
level, while trilepton signatures are expected to be below this level of
detectability. Dilepton mass edges from both \tz_2 and \tz_3 decays may be
measurable in the dilepton + multi-jet +etmissing channel.


title:
Mixed Dark Matter in Universal Extra Dimension Models with TeV Scale
  $W_{R}$ and $Z'$

abstract:
  We show that in a class of universal extra dimension (UED) models that solves
both the neutrino mass and proton decay problems using low scale left-right
symmetry, the dark matter of the Universe consists of an admixture of KK photon
and KK right-handed neutrinos. We present a full calculation of the dark matter
density in these models taking into account the co-annihilation effects due to
near by states such as the scalar partner of the KK photon as well as fermion
states near the right-handed KK neutrino. Using the value of the relic CDM
density, we obtain upper limits on $R^{-1}$ of about 400-650 GeV and
$M_{Z'}\leq 1.5$ TeV, both being accessible to LHC. For a region in this
parameter space where the KK right-handed neutrino contributes significantly to
the total relic density of dark matter, we obtain a lower bound on the dark
matter-nucleon scattering cross section of $10^{-44}$ cm$^2$, which can be
probed by the next round of dark matter search experiments.


title: Collider Signature of T-quarks

abstract:
  Little Higgs models with T Parity contain new vector-like fermions, the T-odd
quarks or "T-quarks", which can be produced at hadron colliders with a
QCD-strength cross section. Events with two acoplanar jets and large missing
transverse energy provide a simple signature of T-quark production. We show
that searches for this signature with the Tevatron Run II data can probe a
significant part of the Little Higgs model parameter space not accessible to
previous experiments, exploring T-quark masses up to about 400 GeV. This reach
covers parts of the parameter space where the lightest T-odd particle can
account for the observed dark matter relic abundance. We also comment on the
prospects for this search at the Large Hadron Collider (LHC).


title: Small-x Dipole Evolution Beyond the Large-N_c Limit

abstract:
  We present a method to include colour-suppressed effects in the Mueller
dipole picture. The model consistently includes saturation effects both in the
evolution of dipoles and in the interactions of dipoles with a target in a
frame-independent way.
  When implemented in a Monte Carlo simulation together with our previous model
of energy--momentum conservation and a simple dipole description of initial
state protons and virtual photons, the model is able to reproduce to a
satisfactory degree both the gamma*-p cross sections as measured at HERA as
well as the total p-p cross section all the way from ISR energies to the
Tevatron and beyond.


title: Realizations of mu-tau interchange symmetry

abstract:
  Some models for the lepton sector, based on seesaw extensions of the Standard
Model, are discussed in which the mu-tau interchange symmetry is realized in
various ways. The symmetries defining such models and their characteristic
predictions for lepton mixing are presented.


title: Process eta -> pi^0 gamma gamma in the Nambu-Jona-Lasinio model

abstract:
  The decay width of the process eta -> pi^0 gamma gamma is calculated in the
framework of the Nambu-Jona-Lasinio model. The momentum dependence of quark
loops is taken into account. Three types of diagrams are considered: quark box,
scalar(a0) and vector(rho, omega) pole diagrams. The obtained estimations are
in satisfactory agreement with recent experimental data.


title:
New Results for Light Gravitinos at Hadron Colliders - Tevatron Limits
  and LHC Perspectives

abstract:
  We derive Feynman rules for the interactions of a single gravitino with
(s)quarks and gluons/gluinos from an effective supergravity Lagrangian in
non-derivative form and use them to calculate the hadroproduction cross
sections and decay widths of single gravitinos. We confirm the results obtained
previously with a derivative Lagrangian as well as those obtained with the
non-derivative Lagrangian in the high-energy limit and elaborate on the
connection between gauge independence and the presence of quartic vertices. We
perform extensive numerical studies of branching ratios, total cross sections,
and transverse-momentum spectra at the Tevatron and the LHC. From the latest
CDF monojet cross section limit, we derive a new and robust exclusion contour
in the gravitino-squark/gluino mass plane, implying that gravitinos with masses
below $2\cdot10^{-5}$ to $1\cdot10^{-5}$ eV are excluded for
squark/gluino-masses below 200 and 500 GeV, respectively. These limits are
complementary to the one obtained by the CDF collaboration, $1.1\cdot 10^{-5}$
eV, under the assumption of infinitely heavy squarks and gluinos. For the LHC,
we conclude that SUSY scenarios with light gravitinos will lead to a striking
monojet signal very quickly after its startup.


title: Naturalness of parity breaking in a supersymmetric SO(10) model

abstract:
  We consider a supersymmetric SO(10) model which remains renormalisable upto
Planck scale. The cosmology of such a model passes through a Left-Right
symmetric phase. Potential problems associated with domain walls can be evaded
if parity breaking is induced by soft terms when supersymmetry breaks in the
hidden sector. The smallness of this breaking permits a brief period of
domination by the domain walls ensuring dilution of gravitinos and other
unwanted relics. The requirement that domain walls disappear constrains some of
the soft parameters of the Higgs potential.


title: CP Violation in Hadronic tau Decays

abstract:
  We re-examine CP violation in the Delta S = 0 decays tau -> N pi nu_tau
(N=2,3,4). We assume that the new physics (NP) is a charged Higgs. We show that
there is no NP contribution to tau -> pi pi nu_tau, which means that no CP
violation is expected in this decay. On the other hand, NP can contribute to
tau -> N pi nu_tau (N=3,4). These are dominated by the intermediate resonant
decays tau -> omega pi nu_tau, tau -> rho pi nu_tau and tau -> a_1 pi nu_tau.
We show that the only sizeable CP-violating effects which are possible are in
tau -> a_1 pi nu_tau -> 4 pi nu_tau (polarization-dependent rate asymmetry) and
tau -> omega pi nu_tau (triple-product asymmetry).


title: Dimension 2 condensates and Polyakov Chiral Quark Models

abstract:
  We address a possible relation between the expectation value of the Polyakov
loop in pure gluodynamics and full QCD based on Polyakov Chiral Quark Models
where constituent quarks and the Polyakov loop are coupled in a minimal way. To
this end we use a center symmetry breaking Gaussian model for the Polyakov loop
distribution which accurately reproduces gluodynamics data above the phase
transition in terms of dimension 2 gluon condensate. The role played by the
quantum and local nature of the Polyakov loop is emphasized.


title: An Update on Models of Neutrino Masses and Mixings

abstract:
  At the School I gave three lectures on neutrino masses and mixings. Much of
the material covered in my first two lectures is written down in a review on
the subject that I published not long ago with F. Feruglio \cite{rev}. Here, I
make a relatively short summary (with updates) of the content of my first two
lectures, referring to our review for a more detailed presentation, and then I
expand on the content of the third lecture which was dedicated to recent work
on A4 models of tri-bimaximal neutrino mixing which were not covered in the
review.


title: Tri-bimaximal Neutrino Mixing from Orbifolding

abstract:
  We show that the A4 discrete symmetry that naturally leads to tri-bimaximal
neutrino mixing can be simply obtained as a result of an orbifolding starting
from a model in 6 dimensions. This particular orbifolding has four fixed points
where 4 dimensional branes are located and the tetrahedral symmetry of A4
connects these branes. In this approach A4 appears after the reduction from six
to four dimensions as a remnant of the 6D space-time symmetry. A previously
discussed supersymmetric version of A4 is reinterpreted along these lines.


title: The narrow pentaquark

abstract:
  The experimental status of the pentaquark searches is briefly reviewed.
Recent null results by the CLAS collaboration are commented, and new strong
evidence of a very narrow Theta+ resonance by the DIANA collaboration is
presented. On the theory side, I revisit the argument against the existence of
the pentaquark -- that of Callan and Klebanov -- and show that actually a
strong resonance is predicted in that approach, however its width is grossly
overestimated. A recent calculation gives 2 MeV for the pentaquark width, and
this number is probably still an upper bound.


title:
Electroweak-Higgs Unification in the Two Higgs Doublet Model: Masses and
  Couplings of the Neutral and Charged Higgs Bosons

abstract:
  We obtain the mass spectrum and the Higgs self-coupling of the two Higgs
doublet model (THDM) in an alternative unification scenario where the
parameters of the Higgs potential $\lambda_i$ ($i=1,2,3,4,5$) are determined by
imposing their unification with the electroweak gauge couplings. An attractive
feature of this scenario is the possibility to determine the Higgs boson masses
by evolving the $\lambda_i$,s from the electroweak-Higgs unification scale
$M_{GH}$ down to the electroweak scale. The unification condition for the gauge
($g_1,g_2$) and Higgs couplings is written as $g_1=g_2=f(\lambda_i)$, where
$g_1=k_Y^{1/2} g_Y$, and $k_Y$ being the normalization constant. Two variants
for the unification condition are discussed; Scenario I is defined through the
linear relation: $g_1=g_2=k_H(i)\lambda_i(M_{GH})$, while Scenario II assumes a
quadratic relation: $g^2_1=g^2_2=k_H(i)\lambda_i(M_{GH})$. Working in Scenario
I, fixing {\it ad hoc} $-k_H(5)={1/2} k_H(4)={3/2} k_H(3)=k_H(2)=k_H(1) =1$,
taking $\tan\beta=1$ and using the standard normalization ($k_Y=5/3$), we
obtain the following spectrum for the Higgs boson masses $m_{h^0} = 109.1$ GeV,
$m_{H^0} = 123.2$ GeV, $m_{A^0} = 115.5$ GeV, and $m_{H^{\pm}} = 80.3$ GeV,
with similar results for other normalizations such as $k_Y=3/2$ and $k_Y=7/4$.


title:
Toward the AdS/CFT gravity dual for High Energy Collisions: I.Falling
  into the AdS

abstract:
  In the context of the AdS/CFT correspondence we discuss the gravity dual of a
high energy collision in a strongly coupled ${\cal N}=4$ SYM gauge theory. We
suggest a setting in which two colliding objects are made of non-dynamical
heavy quarks and antiquarks, which allows to treat the process in classical
string approximation. Collision ``debris'' consist of closed as well as open
strings. If the latter have ends on two outgoing charges, and thus are being
``stretched'' along the collision axes. We discuss motion in AdS of some simple
objects first -- massless and massive particles -- and then focus on open
strings. We study the latter in a considerable detail, concluding that they
rapidly become ``rectangular'' in proper time -spatial rapidity $\tau-y$
coordinates with well separated fragmentation part and a near-free-falling
rapidity-independent central part. Assuming that in the collisions of ``walls''
of charges multiple stretching strings are created, we also consider the motion
of a 3d stretching membrane. We then argue that a complete solution can be
approximated by two different vacuum solutions of Einstein eqns, with matter
membrane separating them. We identify one of this solution with
Janik-Peschanski stretching black hole solution, and show that all objects
approach its (retreating) horizon in an universal manner.


title:
Numerically Stable Calculations of Radiative Corrections to
  Bremsstrahlung in Electron-Positron Annihilation

abstract:
  We discuss techniques for obtaining a numerically-stable evaluation of the
fully differential cross section for the virtual photon correction to single
hard photon bremsstrahlung in two different computational schemes. We also
compare the role of finite mass corrections in these schemes.


title: The Charm Quark Contribution to the Proton Structure Function

abstract:
  The charm quark structure function $F^c_2$ and the longitudinal structure
function $F_l^p$ are directly sensitive to the gluon content of proton and
therefore are crucial in understanding of proton structure function, in
particular at low momentum transfer $Q^2$ and low Bjorken x. In the framework
of perturbative QCD the charm structure function is calculated in the leading
order (LO) and the proton structure function is investigated in the next
leading order (NLO) at small x region. The valence quark distribution is
obtained from the relativistic quark-exchange model. The calculated
$F_2^c(x,Q^2)$, $F_2^p(x,Q^2)$ and $F_L^p(x,Q^2)$, are compared with the
present available experimental data.


title: Analysis of Y(2175) as a tetraquark state with QCD sum rules

abstract:
  In this article, we take the point of view that Y(2175) be a tetraquark state
which consists of color octet constituents, and calculate its mass and decay
constant within the framework of the QCD sum rule approach. We release standard
criterion in the QCD sum rules approach and take more phenomenological
analysis, the value of the mass of Y(2175) is consistent with experimental
data; there may be some tetraquark components in the state Y(2175). If we
retain standard criterion, larger mass than experimental data can be obtained,
the current $J_\mu(x)$ can interpolate a tetraquark state with larger mass, or
Y(2175) has some components with larger mass. The dominating contribution comes
from the perturbative term, which is in contrast to the sum rules with
interpolating currents constructed from diquark pairs. The tetraquark states
may consist of color octet constituents rather than diquark pairs.


title: An approach to NNLO QCD analysis of non-singlet structure function

abstract:
  We use the next-to-next-to-leading order (NNLO) contributions to anomalous
dimension governing the evolution of non-singlet quark distributions. We use
the xF3 data of the CCFR collaboration to obtain some unknown parameters which
exist in the non-singlet quark distributions in the NNLO approximation. In the
fitting procedure, Bernstein polynomial method is used. The results of valence
quark distributions in the NNLO, are in good agreement with the available
theoretical model.


title:
Resolving the A_{FB}^b puzzle in an extra dimensional model with an
  extended gauge structure

abstract:
  It is notorious that, contrary to all other precision electroweak data, the
forward-backward asymmetry for b quarks $A_{FB}^b$ measured in Z decays at LEP1
is nearly three standard deviations away from the predicted value in the
Standard Model; significant deviations also occur in measurements of the
asymmetry off the Z pole. We show that these discrepancies can be resolved in a
variant of the Randall-Sundrum extra-dimensional model in which the gauge
structure is extended to $SU(2)_L \times SU(2)_R \times U(1)_X$ to allow for
relatively light Kaluza-Klein excitations of the gauge bosons. In this
scenario, the fermions are localized differently along the extra dimension, in
order to generate the fermion mass hierarchies, so that the electroweak
interactions for the heavy third generation fermions are naturally different
from the light fermion ones. We show that the mixing between the Z boson with
the Kaluza-Klein excitations allows to explain the $A_{FB}^b$ anomaly without
affecting (and even improving) the agreement of the other precision
observables, including the $Z \to bb$ partial decay width, with experimental
data. Some implications of this scenario for the ILC are summarized.


title:
Lepton Flavor Violating Decays as Probes of Neutrino Mass Spectra and
  Heavy Majorana Neutrino Masses

abstract:
  We investigate the lepton flavor violating (LFV) rare decays in the
supersymmetric minimal seesaw model in which the Frampton-Glashow-Yanagida
ansatz is incorporated. The branching ratio of $\mu \to e \gamma$ is calculated
in terms of the Snowmass Points and Slopes (SPS). We find that the inverted
mass hierarchy is disfavored by all SPS points. In addition, once the ratio of
BR$(\tau \to \mu \gamma)$ to BR$(\mu \to e \gamma)$ is measured, one may
distinguish the normal and inverted neutrino mass hierarchies, and confirm the
masses of heavy right-handed Majorana neutrinos by means of the LFV processes
and the thermal leptogenesis mechanism. It is worthwhile to stress that this
conclusion is independent of the supersymmetric parameters.


title: Spectator model in D meson Decays

abstract:
  In this research we describe effective Hamiltonian theory and apply this
theory to the calculation of current-current $Q_{12}$ and QCD penguin
$Q_{3...6}$ decay rates We calculate the decay rates of semileptonic and
hadronic of charm quark in effective Hamiltonian theory. We investigate the
decay rates of D meson decays according to Spectator Quark Model(SQM) for the
calculation of D meson decays. We obtain the total decay rates of semileptonic
and hadronic of charm quark in effective Hamiltonian according to colour
Favoured (C-F) and colour Suppressed (C-S), and then to added amplitude of
processes colour Favoured and colour Suppressed (F-S) and obtain the decay
rates of them.


title:
On the Consistency of the Ladder Approximation and the Rainbow
  Approximation of Dyson-Schwinger Equation of QCD

abstract:
  We study the consistency of the ladder approximation and the rainbow
approximation of the Dyson-Schwinger equation of QCD. By considering the
non-Abelian property of QCD, we show that the QED-type Ward-Takahashi identity
is not required for the rainbow-ladder approximation of QCD. It indicates that
there does not exists any internal inconsistency in the usual rainbow-ladder
approximation of QCD. In addition, we propose an modified ladder approximation
which guarantees the Slavnov-Taylor identity for the quark-gluon vertex
omitting the ghost effect in the approximation.


title:
Recent and future experimental evidences for exotic mesons in hard
  reactions

abstract:
  The QCD analysis of the recent experimental data (L3@LEP) of the hard
exclusive $\rho\rho$ production in two photon collisions shows that these data
can be understood as a signal for the existence of an exotic isotensor
resonance with a mass around $1.5 {\rm GeV}$. We also argue that hard exclusive
reactions are a powerful tool for an experimental study of exotic hybrid mesons
with $J^{PC}=1^{-+}$.


title:
Natural Gauge and Gravitational Coupling Unification and the
  Superpartner Masses

abstract:
  The possibility to achieve unification at the string scale in the context of
the simplest supersymmetric grand unified theory is investigated. We find
conservative upper bounds on the superpartner masses consistent with the
unification of gauge and gravitational couplings, M_{\tilde G} < 5 TeV and
M_{\tilde f} < 3 \times 10^7 GeV, for the superparticles with spin one-half and
zero, respectively. These bounds hint towards the possibility that this
supersymmetric scenario could be tested at future colliders, and in particular,
at the forthcoming LHC.


title: QCD critical point: a historical perspective

abstract:
  We review the history of the critical point in the QCD phase diagram, baryon
density vs. temperature. In particular we discuss the different theoretical
approaches to this problem.


title: MSSM flat direction inflation

abstract:
  We argue that all necessary ingredients for successful inflation are present
in the flat directions of the minimal supersymmetric standard model (MSSM). Out
of many gauge invariant combinations of the squarks, sleptons and Higgses,
there are two flat directions, ${\bf LLe}$, and ${\bf udd}$, which are
promising candidates for the inflaton. The model predicts more than $10^3$
e-foldings with an inflationary scale of $H_{\rm inf} \sim {\cal O}(1-10)$ GeV,
provides a tilted spectrum $0.92 \leq n_s \leq 1$ with an amplitude of
$\delta_H \sim 10^{-5}$ and a negligible tensor perturbations. It yields a
lower bound $\sim 340$ GeV on the sparticle masses which is within the reach of
LHC. There is no gravitino or moduli problem in this model.


title:
On the Sources of CP-violation Contributing to the Electric Dipole
  Moments

abstract:
  In the framework of seesaw mechanism embedded in the constrained Minimal
Supersymmetric Standard Model (cMSSM), phases of neutrino Yukawa coupling,
$\mu$-term and $A$-terms can all contribute to the Electric Dipole Moment (EDM)
of the electron. We discuss and classify the situations for which by combined
analysis of the upcoming results on $d_e$, $d_{{\rm Hg}}$ and $d_D$
discriminating between these sources will be possible.


title: Neutron structure function moments at leading twist

abstract:
  The experimental data on F2 structure functions of the proton and deuteron
were used to construct their moments. In particular, recent measurements
performed with CLAS detector at Jefferson Lab allowed to extend our knowledge
of structure functions in the large-x region. The phenomenological analysis of
these experimental moments in terms of the Operator Product Expansion permitted
to separate the leading and higher twist contributions. Applying nuclear
corrections to extracted deuteron moments we obtained the contribution of the
neutron. Combining leading twist moments of the neutron and proton we found d/u
ratio at x->1 approaching 0, although 1/5 value could not be excluded. The
twist expansion analysis suggests that the contamination of higher twists
influences the extraction of the d/u ratio at x->1 even at Q2-scale as large as
12 (GeV/c)^2.


title:
Infrared freezing of Euclidean QCD observables in the one-chain
  approximation

abstract:
  We consider the one-chain term in a skeleton expansion for Euclidean QCD
observables. Focusing on the particular example of the Adler D function, we
show that although there is a Landau pole in the coupling at Q^2=\Lambda^2
which renders fixed-order perturbative results infinite, the Landau pole is
absent in the all-orders one-chain result. In this approximation one has
finiteness and continuity at Q^2=\Lambda^2, and a smooth freezing as Q^2
decreases to 0.