title: Information from leading neutrons at HERA

abstract:
  In principle, leading neutrons produced in photoproduction and deep-inelastic
scattering at HERA have the potential to determine the pion structure function,
the neutron absorptive cross section and the form of the pion flux. To explore
this potential we compare theoretical predictions for the x_L and p_t spectra
of leading neutrons, and the Q^2 dependence of the cross section, with the
existing ZEUS data.


title: A review of the pentaquark Theta properties

abstract:
  Although the Theta has been listed as a three star resonance in the 2004
PDG,its existence is still not completely established. Now it is still of
interest to see what QCD has to say on the subject, In this paper we review
briefly the pentaquark Theta properties.


title:
Hadronic forward scattering: Predictions for the Large Hadron Collider
  and cosmic rays

abstract:
  The status of hadron-hadron interactions is reviewed, with emphasis on the
forward and near-forward scattering regions. From analyticity, Finite Energy
Sum Rules are introduced from which new analyticity constraints are derived
that exploit the many very accurate low energy experimental cross sections,
i.e., they constrain the values of the asymptotic cross sections and their
derivatives at low energies just above the resonance regions, allowing us new
insights into duality. A new robust fitting technique is introduced in order to
`clean up' large data samples that are contaminated by outliers. Using our
analyticity constraints, new methods of fitting high energy hadronic data are
introduced which result in much more precise estimates of the fit parameters,
allowing accurate extrapolations to much higher energies. It's shown that the
$\gamma p$, $\pi^\pm p$ and nucleon-nucleon cross sections {\em all} go
asymptotically as $\ln^2s$, saturating the Froissart bound, while conclusively
ruling out $\ln s$ and $s^{\alpha}$ ($\alpha\sim 0.08$) behavior. Implications
of this saturation for predictions of $\sigma_{pp}$ and $\rho_{pp}$ at the LHC
and for cosmic rays p-air cross sections are given.


title: About radiative kaon decay \k+ \to \pi+\pi0\gamma

abstract:
  With usage of the Low theorem the general expression for amplitude of
radiative kaon decay \k+ \to \pi+\pi0\gamma is determined.


title: Counting valence quarks at RHIC and LHC

abstract:
  We consider the Nuclear Modification Ratios in heavy ion collisions, R_CP and
R_AA, in the region of intermediate transverse momentum, and study the
dependency upon the constituent quark composition of the observed hadron.
Adopting a two component recombination/fragmentation model, validated by
experimental information from STAR and PHENIX, we show that a clear distinction
is predicted for the f0(980) between the assumptions of $s\bar s$ or
diquark-antidiquark content.


title: New CP-violation and preferred-frame tests with polarized electrons

abstract:
  We used a torsion pendulum containing $\sim 9 \times 10^{22}$ polarized
electrons to search for CP-violating interactions between the pendulum's
electrons and unpolarized matter in the laboratory's surroundings or the sun,
and to test for preferred-frame effects that would precess the electrons about
a direction fixed in inertial space. We find $|g_{\rm P}^e g_{\rm S}^N|/(\hbar
c)< 1.7 \times 10^{-36}$ and $|g_{\rm A}^e g_{\rm V}^N|/(\hbar c) < 4.8 \times
10^{-56}$ for $\lambda > 1$AU. Our preferred-frame constraints, interpreted in
the Kosteleck\'y framework, set an upper limit on the parameter $|\bm{\tilde
{b}}^e| \leq 5.0 \times 10^{-21}$ eV that should be compared to the benchmark
value $m_e^2/M_{\rm Planck}= 2 \times 10^{-17}$ eV.


title: Meson loop effect on high density chiral phase transition

abstract:
  We test the stability of the mean-field solution in the Nambu--Jona-Lasinio
model. For stable solutions with respect to both the \sigma and \pi directions,
we investigate effects of the mesonic loop corrections of 1/N_c, which
correspond to the next-to-leading order in the 1/N_c expansion, on the high
density chiral phase transition. The corrections weaken the first order phase
transition and shift the critical chemical potential to a lower value. At
N_c=3, however, instability of the mean field effective potential prevents us
from determining the minimum of the corrected one.


title:
Magic Neutrino Mass Matrix and the Bjorken-Harrison-Scott
  Parameterization

abstract:
  Observed neutrino mixing can be described by a tribimaximal MNS matrix. The
resulting neutrino mass matrix in the basis of a diagonal charged lepton mass
matrix is both 2-3 symmetric and magic. By a magic matrix, I mean one whose row
sums and column sums are all identical. I study what happens if 2-3 symmetry is
broken but the magic symmetry is kept intact. In that case, the mixing matrix
is parameterized by a single complex parameter $U_{e3}$, in a form discussed
recently by Bjorken, Harrison, and Scott.


title:
Finite Variance Scaling Analysis of the Solar Neutrino Flux Data from
  Sage and Gallex-Gno Detectors

abstract:
  The scaling behaviours of the monthly solar neutrino flux data from (1) SAGE
detector during the period from 1st January 1990 to 31st December 2000; (2)
SAGE detector during the period from April 1998 to December 2001; (3) GALLEX
detector during the period from May 1991 to January 1997; (4) GNO detector
during the period from May 1998 to December 2001; (5) GALLEX-GNO detector
(combined data) from May 1991 to December 2001 and (6) average of the data from
GNO and SAGE detectors during the period from May 1998 to December 2001 are
analysed. In the present analysis the monthly solar neutrino flux data in each
case is processed through finite variance scaling method in order to find the
corresponding Hurst exponent. The study reveals that the monthly solar neutrino
flux data in 1), 3), 4), 5) and 6) exhibit anti-persistent behaviour (or,
negative autocorrelation) and has underlying trends while the monthly solar
neutrino flux data in 2) shows the nature of a long memory process.


title:
Periodicities in Solar Neutrino Flux Data from Sage and Gallex-Gno
  Detectors

abstract:
  We have used both the Date-Compensated Discrete Fourier Transform and
Periodogram analysis of the monthly solar neutrino flux data from (1) SAGE
detector during the period from 1st January 1990 to 31st December 2000; (2)
SAGE detector during the period from April 1998 to December 2001; (3) GALLEX
detector during the period from May 1991 to January 1997; (4) GNO detector
during the period from May 1998 to December 2001; (5) GALLEX-GNO detector
(Combined data) from May 1991 to December 2001 and (6) average of the data from
GNO and SAGE detectors during the period from May 1998 to December 2001. (1)
exhibits periodicity around 19, 24 and 80-85 months. (2) shows periodicity
around 1.5 months. For (3) we observe periodicity around 1.6, 2.5 and 19
months. For (4) periodicity is seen around 1.4 and 3.4 months. (5) gives
periodicity around 1.7 and 19 months while (6) shows periodicity around 1.8 and
2.2 months. We have found almost similar periods in the solar flares, sunspot
data, solar proton data which indicates that the solar activity cycle is due to
the pulsating character of nuclear energy generation inside the sun.


title:
Constructing the off-diagonal part of active-neutrino mass matrix from
  annihilation and creation matrices in neutrino-generation space

abstract:
  The off-diagonal part of the active-neutrino mass matrix is constructed from
two $3\times 3$ matrices playing the role of annihilation and creation matrices
acting in the neutrino-generation space of $\nu_e, \nu_\mu, \nu_\tau$. The
construction leads to a new relation, $M_{\mu \tau} = 4\sqrt{3} M_{e \mu} $,
which predicts in the case of tribimaximal neutrino mixing that $m_3 - m_1 =
\eta (m_2 - m_1)$ with $\eta = 5.28547$. Then, the maximal possible value of
${\Delta m^2_{32}}/{\Delta m^2_{21}}$ is equal to $\eta^2 -1 = 26.9362$ and
gives $m_1 = 0$. With the experimental estimate ${\Delta m^2_{21}}\sim
8.0\times 10^{-5} {\rm eV}^2$, this maximal value, if realized, predicts
$\Delta m^2_{32} \sim 2.2\times 10^{-3} {\rm eV}^2$, near to the popular
experimental estimation $\Delta m^2_{32} \sim 2.4\times 10^{-3} {\rm eV}^2$.


title:
A new understanding of fermion masses from the unified theory of spins
  and charges

abstract:
  In this letter we try to answer those of the open questions of the Standard
model which concern the appearance of families, mass protection mechanism and
the Yukawa couplings - by using the approach (proposed by one of us), which
suggests a new way beyond the Standard model. The approach has in the starting
action for fermions, which carry in d(=1 +13)-dimensional space only the spin
(two kinds of the spin) and interact with only spin connection and vielbein
fields, the term manifesting as a mass term in d=1+3. (After making several
approximations and assumptions) we connect free parameters of the approach with
the experimental data and investigate a possibility that the fourth family
appears at low enough energies to be observable in the new generation of
accelerators.


title: (Lambda_b -> Lambda l^+ l^-) decay in universal extra dimensions

abstract:
  We study the exclusive (Lambda_b -> \Lambda l^+ l^-) decay in the Appelquist,
Chang, Dobrescu model within one universal extra dimension. We investigate the
sensitivity of the branching ratio, lepton polarization and forward-backward
asymmetry A_{FB} to the compactification parameter (1/R) We obtain that the
branching ratio changed about 50% compared to the SM value, when (1/R=200 GeV)
and zero position of the forward-backward asymmetry is shifted to the left
compared to the SM result. Therefore measurement of the branching ratio of
(Lambda_b -> Lambda l^+ l^-) decay and determination of zero position of A_{FB}
are very useful in looking for new physics in the framework of the UED models.


title: Supersymmetric Lepton Flavor Violation and Leptogenesis

abstract:
  We present and discuss constraints on supersymmetric type I seesaw models
imposed by neutrino data, charged lepton flavor violation and thermal
leptogenesis.


title: The radiative return method - a short theory review

abstract:
  A short review of the status of the theoretical developments concerning the
radiative return method is presented. The emphasis is on the construction of
the PHOKHARA Monte Carlo event generator and its tests. It is advocated that
the radiative return method provides not only with the hadronic cross section
extraction competitive with and complementary to the scan method, but also that
it is a powerful tool in detailed studies of the hadron interactions.


title:
Gravitino production in an inflationary Universe and implications for
  leptogenesis

abstract:
  Models of leptogenesis are constrained by the low reheat temperature at the
end of reheating associated with the gravitino bound. However a detailed view
of reheating, in which the maximum temperature during reheating, $\Tmax$, can
be orders of magnitude higher than the reheat temperature, allows for the
production of heavy Majorana neutrinos needed for leptogenesis. But then one
must also consider the possibility of enhanced gravitino production in such
scenarios. In this article we consider gravitino production during reheating,
its dependence on $\Tmax$, and its relevance for leptogenesis. Earlier
analytical studies of the gravitino abundance have only considered gravitino
production in the post-reheating radiation dominated era. We find that the
gravitino abundance generated during reheating is comparable to that generated
after reheating. This lowers the upper bound on the reheat temperature by a
factor of 4/3.


title: From QCD at high energy to statistical physics and back

abstract:
  In these proceedings, we shall first recall the evolution equations arising
when increasing the rapidity $Y=\log(s)$ within the perturbative QCD regime. We
shall then summarise the main properties on their asymptotic solutions and
discuss the physical picture emerging from our analysis.


title: Cosmology and New Physics

abstract:
  A comparison of the standard models in particle physics and in cosmology
demonstrates that they are not compatible, though both are well established.
Basics of modern cosmology are briefly reviewed. It is argued that the
measurements of the main cosmological parameters are achieved through many
independent physical phenomena and this minimizes possible interpretation
errors. It is shown that astronomy demands new physics beyond the frameworks of
the (minimal) standard model in particle physics. More revolutionary
modifications of the basic principles of the theory are also discussed.


title:
The controversy about "1/m_Q duality violation" ; a quark model point of
  view

abstract:
  A detailed discussion based on exact calculations, possible in the non
relativistic quark model, is given to show that there is no 1/m_Q term in the
heavy quark expansion of totally integrated semileptonic decay rates. More
generally, it is shown that OPE holds with very few terms in the expansion, at
least in the harmonic oscillator model.


title:
Single Scale Tadpoles and O(GF mt^2 as^3) Corrections to the rho
  Parameter

abstract:
  We present a new set of high precision numerical values of four-loop
single-scale vacuum integrals, which we subsequently use to obtain the
non-singlet corrections to the rho parameter at O(GF mt^2 as^3). Our result for
Delta rho is in agreement with the recent calculation [1].


title:
On the probability distribution of the stochastic saturation scale in
  QCD

abstract:
  It was recently noticed that high-energy scattering processes in QCD have a
stochastic nature. An event-by-event scattering amplitude is characterised by a
saturation scale which is a random variable. The statistical ensemble of
saturation scales formed with all the events is distributed according to a
probability law whose cumulants have been recently computed. In this work, we
obtain the probability distribution from the cumulants. We prove that it can be
considered as Gaussian over a large domain that we specify and our results are
confirmed by numerical simulations.


title:
Holomorphic selection rules, the origin of the mu term, and thermal
  inflation

abstract:
  When an abelian gauge theory with integer charges is spontaneously broken by
the expectation value of a charge Q field, there remains a Z_Q discrete
symmetry. In a supersymmetric theory, holomorphy adds additional constraints on
the operators that can appear in the effective superpotential. As a result,
operators with the same mass dimension but opposite sign charges can have very
different coupling strengths. In the present work we characterize the operator
hierarchies in the effective theory due to holomorphy, and show that there
exist simple relationships between the size of an operator and its mass
dimension and charge. Using such holomorphy-induced operator hierarchies, we
construct a simple model with a naturally small supersymmetric mu term. This
model also provides a concrete realization of late-time thermal inflation,
which has the ability to solve the gravitino and moduli problems of weak-scale
supersymmetry.


title: Weak Quasi-elastic Production of Hyperons

abstract:
  The quasielastic weak production of $\Lambda$ and $\Sigma$ hyperons from
nucleons and nuclei induced by antineutrinos is studied in the energy region of
some ongoing neutrino oscillation experiments in the intermediate energy
region. The hyperon nucleon transition form factors determined from neutrino
nucleon scattering and an analysis of high precision data on semileptonic
decays of neutron and hyperons using SU(3) symmetry have been used. The nuclear
effects due to Fermi motion and final state interaction effects due to hyperon
nucleon scattering have also been studied. The numerical results for
differential and total cross sections have been presented.


title:
Relating the description of gluon production in pA collisions and parton
  energy loss in AA collisions

abstract:
  We calculate the classical gluon field of a fast projectile passing through a
dense medium. We show that this allows us to calculate both the initial state
gluon production in proton-nucleus collisions and the final state gluon
radiation off a hard parton produced in nucleus-nucleus collisions. This
unified description of these two phenomena makes the relation between the
saturation scale $Q_s$ and the transport coefficient $\hat q$ more transparent.
Also, we discuss the validity of the eikonal approximation for gluon
propagation inside the nucleus in proton-nucleus collisions at RHIC energy.


title:
Fixed target Drell-Yan data and NNLO QCD fits of parton distribution
  functions

abstract:
  We discuss the influence of fixed target Drell-Yan data on the extraction of
parton distribution functions at next-to-next-to-leading order (NNLO) in QCD.
When used in a parton distribution fit, the Drell-Yan (DY) data constrain sea
quark distributions at large values of Bjorken x. We find that not all
available DY data are useful for improving the precision of parton distribution
functions (PDFs) obtained from a fit to the deep inelastic scattering (DIS)
data. In particular, some inconsistencies between DIS-based parton distribution
functions and DY data for large values of dilepton rapidity are found. However,
by selecting a sample of the DY data that is both representative and consistent
with the DIS data, we are able to perform a combined PDF fit that significantly
improves the precision of non-strange quark distributions at large values of x.
The NNLO QCD corrections to the DY process are crucial for improving the
precision. They reduce the uncertainty of the theoretical prediction, making it
comparable to the experimental uncertainty in DY cross-sections over a broad
range of x.


title: Instanton contribution to the Sivers function

abstract:
  We study the Sivers function for valence u and d quarks in the proton within
the instanton model for QCD vacuum, adopting the MIT bag model wave functions
for quarks. Within approaches based on perturbative one-gluon final state
interactions a non-zero value of the Sivers function is related to the presence
of both S and P wave components in quark wave functions. We show that the
instanton-induced chromomagnetic, nonperturbative interaction leads to very
specific spin-spin correlations between the struck and spectator quarks,
resulting in a non-trivial flavour dependence of the Sivers function.
Comparison of the obtained Sivers functions with phenomenological
parameterizations is discussed.


title:
Soliton solutions of the improved quark mass density-dependent model at
  finite temperature

abstract:
  The improved quark mass density-dependent model (IQMDD) based on soliton bag
model is studied at finite temperature. Appling the finite temperature field
theory, the effective potential of the IQMDD model and the bag constant $B(T)$
have been calculated at different temperatures. It is shown that there is a
critical temperature $T_{C}\simeq 110 \mathrm{MeV}$. We also calculate the
soliton solutions of the IQMDD model at finite tmperature. It turns out that
when $T<T_{C}$, there is a bag constant $B(T)$ and the soliton solutions are
stable. However, when $T>T_{C}$ the bag constant $B(T)=0$ and there is no
soliton solution, therefore, the confinement of quarks are removed quickly.


title: Minimal Realistic SU(5) Scenario

abstract:
  We present phenomenological aspects of the simplest realistic SU(5) grand
unified theory--the theory with the 5, 15, and 24 dimensional representations
in the Higgs sector. We show that a successful gauge coupling unification sets
experimentally accessible upper bound on the total proton decay lifetime. It
also relates proton decay lifetime to scalar leptoquark mass in an
experimentally testable manner. We also discuss an addition of gauge
singlets--both fermions and bosons--to the simplest scenario and comment on
relevant phenomenological consequences of such modifications.


title: The linear sigma model at a finite isospin chemical potential

abstract:
  The effect of finite isospin chemical potential to the effective masses of
the mesons at finite temperature is investigated in the framework of the O(4)
linear sigma model with explicit chiral symmetry breaking. We present a
mechanism to include the isospin chemical potential in the model. By using the
Cornwall-Jackiw-Tomboulis method of composite operators, we obtain a set gap
equations for the effective masses of the mesons and get the numerical results
in the Hartree approximation. We find that the introduction of the chemical
potential only affects the mass of the charged pions and sigma, while there is
almost NO effects on the mass of neutral pions.


title:
Influence of finite quark chemical potentials on the three flavor LOFF
  phase of QCD

abstract:
  We study in the Ginzburg-Landau approximation, the
Larkin-Ovchinnikov-Fulde-Ferrell (LOFF) phase of QCD with three flavors and one
plane wave, including terms of order O(1/mu). We show that the LOFF window is
slightly enlarged, and actually splits into two different regions, one
characterized by u-s and d-u pairings and the other with d-u pairs only.


title: Searching for doubly charged Higgs bosons at the LHC in a 3-3-1 Model

abstract:
  Using a peculiar version of the SU(3)L x U(1)N electroweak model, we
investigate the production of doubly charged Higgs boson at the Large Hadron
Collider. Our results include branching ratio calculations for the doubly
charged Higgs and for one of the neutral scalar bosons of the model.


title: MRST Parton Distributions -- status 2006

abstract:
  We present the new preliminary MRST parton distributions at NLO and NNLO. The
analysis includes some new data and there is an improvement in the theoretical
treatment at NNLO. Essentially complete NNLO partons are presented for the
first time, together with uncertainties.


title:
Jet quenching at finite `t Hooft coupling and chemical potential from
  AdS/CFT

abstract:
  Following the nonperturbative prescription for the jet quenching parameter
recently proposed by Liu, Rajagopal and Wiedemann, we compute the first
correction in the inverse `t Hooft coupling corresponding to string alpha'
corrections in the dual background. We also consider the introduction of a
chemical potential for the U(1)^3 gauged R-symmetry. While the former mildly
diminishes the jet quenching parameter -this suggesting a smooth interpolation
between the strong coupling and perturbative results-, the latter generically
increases its value. We comment on the extension of this setup to quarks of
finite mass.


title: Cross section dependence of event rates at neutrino telescopes

abstract:
  We examine the dependence of event rates at neutrino telescopes on the
neutrino-nucleon cross section for neutrinos with energy above 1 PeV, and
contrast the results with those for cosmic ray experiments. Simple scaling of
the Standard Model cross sections leaves the rates of upward events essentially
unchanged. Details, such as detector depth and cross section inelasticity, can
influence rates. Numerical estimates of upward shower, muon and tau event rates
in the IceCube detector confirm these results.


title: S-bases as a tool to solve reduction problems for Feynman integrals

abstract:
  We suggest a mathematical definition of the notion of master integrals and
present a brief review of algorithmic methods to solve reduction problems for
Feynman integrals based on integration by parts relations. In particular, we
discuss a recently suggested reduction algorithm which uses Groebner bases. New
results obtained with its help for a family of three-loop Feynman integrals are
outlined.


title: Model Independent Bounds on Magnetic Moments of Majorana Neutrinos

abstract:
  We analyze the implications of neutrino masses for the magnitude of neutrino
magnetic moments. By considering electroweak radiative corrections to the
neutrino mass, we derive model-independent naturalness upper bounds on neutrino
magnetic moments, $\mu_\nu$, generated by physics above the electroweak scale.
For Dirac neutrinos, the bound is several orders of magnitude more stringent
than present experimental limits. However, for Majorana neutrinos the magnetic
moment contribution to the mass is Yukawa suppressed. The bounds we derive for
magnetic moments of Majorana neutrinos are weaker than present experimental
limits if $\mu_\nu$ is generated by new physics at ~ 1 TeV, and surpass current
experimental sensitivity only for new physics scales > 10 -- 100 TeV. The
discovery of a neutrino magnetic moment near present limits would thus signify
that neutrinos are Majorana particles.


title:
Extrapolating parton fragmentation to low $Q^2$ in $e^+$-$e^-$
  collisions

abstract:
  We analyze the energy scale dependence of fragmentation functions from
$e^+$-$e^-$ collisions using conventional momentum measures $x_p$ and $\xi_p$
and rapidity $y$. We find that replotting fragmentation functions on a
normalized rapidity variable results in a compact form precisely represented by
the beta distribution, its two parameters varying slowly and simply with parton
energy scale $Q$. The resulting parameterization enables extrapolation of
fragmentation functions to low $Q$ in order to describe fragment distributions
at low transverse momentum $p_t$ in heavy ion collisions at RHIC.


title:
Reconstructing the Right-Handed Neutrino Masses in Left-Right Symmetric
  Theories

abstract:
  We introduce a method to extract the right-handed neutrino mass matrix from
the Left-Right symmetric seesaw formula and apply it to the study of a simple
SUSY SO(10) theory. We find 8 possible solutions for the heavy neutrino
spectrum and a richer phenomenology than in the pure type I or type II seesaw
mechanism. Leptogenesis is studied in SO(10) and can be accomodated more easily
than with the type I dominance.


title: Possible glueball production in relativistic heavy-ion collisions

abstract:
  Within a thermal model we estimate possible multiplicities of scalar
glueballs in central Au+Au collisions at AGS, SPS, RHIC and LHC energies. For
the glueball mass in the region 1.5-1.7 GeV, the model predicts on average (per
event) 0.5-1.5 glueballs at RHIC and 1.5-4 glueballs at LHC energies. Possible
enhancement mechanisms are discussed.


title:
On nature of scalar and tensor mesons from the analysis of processes
  pi-pi-> pi-pi, K-Kbar, eta-eta

abstract:
  Analysis of the isoscalar S- and D-waves of processes pi-pi-> pi-pi, K-Kbar,
eta-eta is carried out aimed at studying the status and QCD nature of scalar
and tensor mesons below 2 GeV and 2.3 GeV, respectively. Assignment of these
mesons to lower scalar and tensor nonets is proposed.


title: A zero-dimensional model for high-energy scattering in QCD

abstract:
  We investigate a zero-dimensional toy model originally introduced by Mueller
and Salam which mimics high-energy scattering in QCD in the presence of both
gluon saturation and gluon number fluctuations, and hence of Pomeron loops.
Unlike other toy models of the reaction-diffusion type, the model studied in
this paper is consistent with boost invariance and, related to that, it
exhibits a mechanism for particle saturation close to that of the JIMWLK
equation in QCD, namely the saturation of the emission rate due to high-density
effects. Within this model, we establish the dominant high-energy behaviour of
the S-matrix element <S^n> for the scattering between a target obtained by
evolving one particle and a projectile made with exactly n particles.
Remarkably, we find that all such matrix elements approach the black disk limit
S=0 at high rapidity Y, with the same exponential law: <S^n> ~ exp(-Y) for all
values of n. This is so because the S-matrix is dominated by rare target
configurations which involve only few particles. We also find that the bulk
distribution for a saturated system is of the Poisson type.


title: The Two-loop Anomalous Dimension Matrix for Soft Gluon Exchange

abstract:
  The resummation of soft gluon exchange for QCD hard scattering requires a
matrix of anomalous dimensions. We compute this matrix directly for arbitrary 2
to n massless processes for the first time at two loops. Using color generator
notation, we show that it is proportional to the one-loop matrix. This result
reproduces all pole terms in dimensional regularization of the explicit
calculations of massless 2 to 2 amplitudes in the literature, and it predicts
all poles at next-to-next-to-leading order in any 2 to n process that has been
computed at next-to-leading order. The proportionality of the one- and two-loop
matrices makes possible the resummation in closed form of the
next-to-next-to-leading logarithms and poles in dimensional regularization for
the 2 to n processes.


title: Particle interactions, masses and the symmetry breaking

abstract:
  A possible original $SU(2)_{L} \times SU(2)_{R}$ symmetry of the elementary
particles and the mechanism of its breaking is discussed. It is concluded that
it is the broken symmetry states of the particles which induce the interactions
among the particles.


title: Nonlinear Inflaton Fragmentation after Preheating

abstract:
  We consider the nonlinear dynamics of inflaton fragmentation during and after
preheating in the simplest model of chaotic inflation. While the earlier regime
of parametric resonant particle production and the later turbulent regime of
interacting fields evolving towards equilibrium are well identified and
understood, the short intermediate stage of violent nonlinear dynamics remains
less explored. Lattice simulations of fully nonlinear preheating dynamics show
specific features of this intermediate stage: occupation numbers of the scalar
particles are peaked, scalar fields become significantly non-gaussian and the
field dynamics become chaotic and irreversible. Visualization of the field
dynamics in configuration space reveals that nonlinear interactions generate
non-gaussian inflaton inhomogeneities with very fast growing amplitudes. The
peaks of the inflaton inhomogeneities coincide with the peaks of the scalar
field(s) produced by parametric resonance. When the inflaton peaks reach their
maxima, they stop growing and begin to expand. The subsequent dynamics is
determined by expansion and superposition of the scalar waves originating from
the peaks. Multiple wave superposition results in phase mixing and turbulent
wave dynamics. Thus, the short intermediate stage is defined by the formation,
expansion and collision of bubble-like field inhomogeneities associated with
the peaks of the original gaussian field. This process is qualitatively similar
to the bubble-like inflaton fragmentation that occurs during tachyonic
preheating after hybrid or new inflation.


title:
An Empirical Study of Boosted Neural Network for Particle Classification
  in High Energy Collisions

abstract:
  The possible application of boosted neural network to particle classification
in high energy physics is discussed. A two-dimensional toy model, where the
boundary between signal and background is irregular but not overlapping, is
constructed to show how boosting technique works with neural network. It is
found that boosted neural network not only decreases the error rate of
classification significantly but also increases the efficiency and
signal-background ratio. Besides, boosted neural network can avoid the
disadvantage aspects of single neural network design. The boosted neural
network is also applied to the classification of quark- and gluon- jet samples
from Monte Carlo \EE collisions, where the two samples show significant
overlapping. The performance of boosting technique for the two different
boundary cases -- with and without overlapping is discussed.


title: Two-pion transitions in quarkonium revisited

abstract:
  Two-pion transitions in charmonium and bottomonium are considered with the
leading relativistic effects taken into account. The contribution of the
chromo- magnetic interaction of the charmed quarks to the amplitude of the
decay $\psi(2S) \to \pi \pi J/\psi$ is estimated from the available data. This
contribution is enhanced by a factor of three in the decay $\eta_c(2S) \to \pi
\pi \eta_c$ and should produce a noticeable modification of the rate and the
spectrum in the latter decay. It is argued that the peculiar observed spectrum
in the decay $\Upsilon(3S) \to \pi \pi \Upsilon$ arises due to a dynamical
suppression of the leading nonrelativistic quarkonium amplitude and thus
enhanced prominence of the relativistic terms. Also discussed are the effects
of the final state interaction between the pions.


title: Neutrino dispersion in external magnetic field and plasma

abstract:
  Neutrino dispersion properties in an active medium consisting of magnetic
field and plasma are analysed. We consider in detail the contribution of a
magnetic field into the neutrino self-energy operator Sigma (p). The results
for this contribution were contradictory in the previous literature. For the
conditions of the early universe where the background medium consists of a
charge-symmetric plasma, the pure magnetic field contribution to the neutrino
dispersion relation is proportional to (e B)^2 and thus comparable to the
contribution of the magnetized plasma. We consider one more hypothetical effect
of the active medium influence on neutrino properties, the so-called ``neutrino
spin light'' discussed in the literature. We show that this effect has no
physical region of realization because of the medium influence on photon
dispersion.


title:
The BFKL Pomeron Calculus: Probabilistic Interpretation and High Energy
  Amplitude

abstract:
  In this paper we continue to pursue a goal of finding the effective theory
for high energy interaction in QCD based on the colour dipole approach, for
which the BFKL Pomeron Calculus gives a low energy limit. The two key problems,
that we consider are the following: the probabilistic interpretation of the
BFKL Pomeron Calculus and the possible scenario for the asymptotic behaviour of
the scattering amplitude at high energy in QCD. In this paper we show that the
generating functional approach is equivalent to the BFKL Pomeron Calculus and
leads to a clear interpretation of this calculus as an alternative description
of the system of interacting colourless dipoles. We calculated the two BFKL
Pomerons into one BFKL Pomeron vertex directly in the dipole approach and show
that this merging can be described as the decay of two dipoles into four
dipoles in the dipole approach. This result means the JIMWLK approach can give
us all neeeded vertices for the BFKL Pomeron calculus and, therefore, they
together give the selfconsistent and complete theoretical approach to high
energy scattering in QCD.


title:
Neutrino chirality flip in a supernova and the bound on the neutrino
  magnetic moment

abstract:
  The neutrino chirality-flip process under the conditions of the supernova
core is investigated in detail with the plasma polarization effects in the
photon propagator taken into account. It is shown that the contribution of the
proton fraction of plasma is essential. New upper bounds on the neutrino
magnetic moment are obtained: mu_nu < (0.5 - 1.1) 10^{-12} mu_B from the limit
on the supernova core luminosity for nu_R emission, and mu_nu < (0.4 - 0.6)
10^{-12} mu_B from the limit on the averaged time of the neutrino spin-flip.
The best astrophysical upper bound on the neutrino magnetic moment is improved
by the factor of 3 to 7.


title: Plasma induced neutrino radiative decay instead of neutrino spin light

abstract:
  The conversion nu_L -> nu_R gamma^* of a neutrino with a magnetic moment is
considered, caused by the additional Wolfenstein energy acquired by a
left-handed neutrino in medium, with an accurate taking account of the photon
\gamma^* dispersion in medium. It is shown that the threshold arises in the
process, caused by the photon (plasmon) effective mass. This threshold leaves
no room for the so-called "neutrino spin light" in the most of astrophysical
situations.


title: QCD challenges at the LHC

abstract:
  In this talk I review some challenges which await perturbative QCD at the
Large Hadron Collider. In particular, I consider the underlying event, Monte
Carlo methods and next-to-leading order (NLO) calculations.


title: Probing Electroweak Top Quark Couplings at Hadron and Lepton Colliders

abstract:
  We discuss possibilities to measure the tt-gamma and ttZ couplings at hadron
and lepton colliders. We also briefly describe how these measurements can be
used to constrain the parameter space of models of new physics, in particular
Little Higgs models.


title: Heavy quark production and non-linear gluon evolution at the LHC

abstract:
  We investigate the importance of unitarity corrections to parton evolution in
heavy flavor production at the LHC. The gluon distribution is determined with a
fit to HERA data applying a unified BFKL-DGLAP approach, in which the
non-linear evolution is described by the Balitsky-Kovchegov equation. First we
estimate b anti-b production at CDF and D0. Then, cross sections for heavy
quark production at various LHC experiments are estimated, tracing the impact
of the unitarity corrections.


title: Once again about the reaction phi(1020)-> gamma-pi-pi

abstract:
  Gauge invariance constraints and analytical properties of the amplitudes e+
e- -> gamma-pi-pi and phi(1020) -> gamma-pi-pi are discussed in line with the
criticism of N.N. Achasov in hep-ph/0606003. I show that the formulae of our
paper (Yad. Fiz. {\bf 68} 1614 (2005) [PAN {\bf 68} 1554 (2005)],
hep-ph/0403123) have nothing common with those N.N. Achasov claims to be ours -
his criticism is therefore misplaced.


title: Transition from real to virtual polarized photon structures

abstract:
  We investigate the transition of the polarized photon structure function
$g_1^\gamma(x,Q^2,P^2)$ when the target photon shifts from on-shell ($P^2=0$)
to far off-shell ($P^2\gg \Lambda^2$) region. The analysis is performed to the
next-to-leading order in QCD. The first moment of $g_1^\gamma$ which vanishes
for the real photon, turns to be a negative value when target photon becomes
off-shell. The explicit $P^2$-dependence of the first moment sum rule as well
as of the structure function $g_1^\gamma(x,Q^2,P^2)$ as a function of $x$ is
studied in the framework of the vector meson dominance model.


title: Once more about the K\bar K molecule approach to the light scalars

abstract:
  We show that the recent paper \cite{kalash}, claiming that the radiative
decays \phi\to a_0(980)\gamma and \phi\to f_0(980)\gamma should be of the same
order of magnitude regardless of whether the a_0(980) and f_0(980) are compact
four-quark states or extended K\bar K molecule states, is misleading.


title:
Towards an understanding of nucleon spin structure: from hard to soft
  scales

abstract:
  The workshop "The Helicity Structure of the Nucleon" (BNL June 5, 2006) was
organized as part of the 2006 RHIC & AGS Users' Meeting to review the status of
the spin problem and future directions. The presentations can be found at
http://www.phenix.bnl.gov/WWW/publish/caidala/UsersHelicityWorkshop2006/ .
Recent data suggests small polarized glue and strangeness in the proton. Here
we present a personal summary of the main results and presentations. What is
new and exciting in the data, and what might this tell us about the structure
of the proton ?


title: Theta pentaquark In Multiquark Theories

abstract:
  In this paper we explain and discuss some fundamental features of various
models which are QCD-based and proposed to explain the hadron spectrum.


title: Missing heavy flavor backgrounds to Higgs boson production

abstract:
  We investigate characteristics of the signal and backgrounds for Higgs boson
decay into WW at the Fermilab Tevatron and CERN Large Hadron Collider. In the
the lepton-pair-plus-missing-energy final state, we show that the background
receives an important contribution from semileptonic decays of heavy flavors.
Lepton isolation cuts provide too little suppression of these heavy flavor
contributions, and an additional 4 to 8 orders-of-magnitude suppression must
come from physics cuts. We demonstrate that an increase of the minimum
transverse momentum of nonleading leptons in multilepton events is one
effective way to achieve the needed suppression, without appreciable loss of
the Higgs boson signal. Such a cut would impact the efficiency of searches for
supersymmetry as well. We emphasize the importance of direct measurement of the
lepton background from heavy flavor production.


title: Exclusive diffractive processes at HERA within the dipole picture

abstract:
  We present a simultaneous analysis, within an impact parameter dependent
saturated dipole model, of exclusive diffractive vector meson (J/psi, phi and
rho) production, deeply virtual Compton scattering and the total gamma* p cross
section data measured at HERA. Various cross sections measured as a function of
the kinematic variables Q^2, W and t are well described, with little
sensitivity to the details of the vector meson wave functions. We determine the
properties of the gluon density in the proton in both longitudinal and
transverse dimensions, including the impact parameter dependent saturation
scale. The overall success of the description indicates universality of the
emerging gluon distribution and proton shape.


title: Isospin and a possible interpretation of the newly observed X(1576)

abstract:
  Recently, the BES collaboration observed a broad resonant structure X(1576)
with a large width being around 800 MeV and assigned its $J^{PC}$ number to
$1^{--}$. We show that the isospin of this resonant structure should be
assigned to 1. This state might be a molecule state or a tetraquark state. We
study the consequences of a possible $K^*(892)$-${\bar \kappa}$ molecular
interpretation. In this scenario, the broad width can easily be understood. By
using the data of $B(J/\psi\to X\pi^0)\cdot B(X\to K^+K^-)$, the branching
ratios $B(J/\psi\to X\pi^0)\cdot B(X\to \pi^+\pi^-)$ and $B(J/\psi\to
X\pi^0)\cdot B(X\to K^+K^-\pi^+\pi^-)$ are further estimated in this molecular
state scenario. It is shown that the $X\to \pi^+\pi^-$ decay mode should have a
much larger branching ratio than the $X\to K^+K^-$ decay mode has. As a
consequence, this resonant structure should also be seen in the $J/\psi\to
\pi^+\pi^-\pi^0$ and $J/\psi\to K^+K^-\pi^+\pi^-\pi^0$ processes, especially in
the former process. Carefully searching this resonant structure in the
$J/\psi\to \pi^+\pi^-\pi^0$ and $J/\psi\to K^+K^-\pi^+\pi^-\pi^0$ decays should
be important for understanding the structure of X(1567).


title: Super-leading logarithms in gaps-between-jets

abstract:
  We identify a source of super-leading logarithms in the gaps-between-jets
observable at hadron colliders. These new contributions are expected to
generally appear in non-global observables in QCD and are connected with the
presence of Coulomb phase terms.


title:
A Positive-Weight Next-to-Leading-Order Monte Carlo for Z Pair
  Hadroproduction

abstract:
  We present a first application of a previously published method for the
computation of QCD processes that is accurate at next-to-leading order, and
that can be interfaced consistently to standard shower Monte Carlo programs. We
have considered Z pair production in hadron-hadron collisions, a process whose
complexity is sufficient to test the general applicability of the method. We
have interfaced our result to the HERWIG and PYTHIA shower Monte Carlo
programs. Previous work on next-to-leading order corrections in a shower Monte
Carlo (the MC@NLO program) may involve the generation of events with negative
weights, that are avoided with the present method. We have compared our results
with those obtained with MC@NLO, and found remarkable consistency. Our method
can also be used as a standalone, alternative implementation of QCD
corrections, with the advantage of positivity, improved convergence, and
next-to-leading logarithmic accuracy in the region of small transverse momentum
of the radiated parton.


title: Chromo-Hydrodynamic Approach to the Unstable Quark-Gluon Plasma

abstract:
  We derive hydrodynamic-like equations that are applicable to short-time scale
color phenomena in the quark-gluon plasma. The equations are solved in the
linear response approximation, and the gluon polarization tensor is derived. As
an application, we study the collective modes in a two-stream system and find
plasma instabilities when the fluid velocity is larger than the speed of sound
in the plasma. The chromo-hydrodynamic approach, discussed here in detail,
should be considered as simpler over other approaches and well-designed for
numerical studies of the dynamics of an unstable quark-gluon plasma.


title: Unification Without Doublet-Triplet Splitting

abstract:
  Matter-Higgs unification in string-inspired supersymmetric Grand Unified
Theories predicts the existence of colored states in the Higgs multiplets and
calls for two extra generations of Higgs-like fields ('unhiggses'). If these
states are present near the TeV scale, gauge-coupling unification points to the
existence of two distinct scales, 10^15 GeV where right-handed neutrinos and a
Pati-Salam symmetry appear, and 10^18 GeV where complete unification is
achieved. Baryon-number conservation, while not guaranteed, can naturally
emerge from an underlying flavor symmetry. Collider signatures and dark-matter
physics may be drastically different from the conventional MSSM.


title:
Chiral loop corrections to strong decays of positive and negative parity
  charmed mesons

abstract:
  We consider chiral loop corrections to the effective couplings which describe
the strong interactions of two heavy mesons of even or odd parities and a light
pseudoscalar meson, within a framework which combines heavy quark effective
theory and chiral perturbation theory. The strong couplings are extracted from
the experimental results for the decay widths, after including chiral
corrections. We find that the introduction of positive parity heavy meson
fields into the framework gives relevant contributions to the chiral loop
corrections of the effective couplings. The counterterms' contributions are
studied by making a randomized fit distribution of the relevant couplings at mu
= 1 GeV. Then we discuss the chiral extrapolation based on calculated loop
contributions. The inclusion of positive parity mesons in the chiral loops is
found to be important for the lattice QCD studies of charm meson properties,
where the knowledge of chiral limit behavior is required.


title:
Upper Bound on the Proton Lifetime and the Minimal Non-SUSY Grand
  Unified Theory

abstract:
  In this talk we show that it is possible to find an upper bound on the total
proton lifetime. We conclude that the minimal realistic non-supersymmetric
grand unified theory is the modified Georgi-Glashow model with a Higgs sector
composed of 5_H, 24_H, and 15_H. We discuss the possibility to test this
scenario at the next generation of proton decay experiments and future
colliders through the production of light scalar leptoquarks.


title: Soft-gluon corrections in hard-scattering processes through NNNLO

abstract:
  I discuss soft-gluon corrections in hard-scattering processes and their
resummation. I present master formulas for the expansion of the resummed cross
section through NNNLO and discuss the significance of these corrections in a
number of processes.


title:
Constituent quarks, chiral symmetry, and chiral point of the constituent
  quark model

abstract:
  We construct the full axial current of the constituent quarks by a summation
of the infinite number of diagrams describing constituent-quark soft
interactions. By requiring that the conservation of this current is violated
only by terms of order $O(M_\pi^2)$, where $M_\pi$ is the mass of the lowest
pseudoscalar $\bar QQ$ bound state, we derive important constraints on (i) the
axial coupling $g_A$ of the constituent quark and (ii) the $\bar QQ$ potential
at large distances. We define the chiral point of the constituent quark model
as those values of the parameters, such as the masses of the constituent quarks
and the couplings in the $\bar QQ$ potential, for which $M_\pi$ vanishes. At
the chiral point the main signatures of the spontaneously broken chiral
symmetry are shown to be present, namely: the axial current of the constituent
quarks is conserved, the leptonic decay constants of the excited pseudoscalar
bound states vanish, and the pion decay constant has a nonzero value.


title: The 27-plet baryons with spin 3/2 under SU(3) symmetry

abstract:
  We investigate the spin 3/2 baryons in the 27-plet based on flavor SU(3)
symmetry. For $J^p=3/2^+$, we find all the candidates for non-exotic members.
For $J^p=3/2^-$, we predict a new non-exotic member $\Lambda(1780)$. Fitting
the mass spectrum and calculating the widths of the members show an approximate
symmetry of the 27-plet of SU(3). We find that the exotic members have
relatively large widths and the $\Xi(1950)$ has spin and parity $J^p=3/2^-$.
The possibility of assigning the non-exotic candidates to an octet is also
analyzed.


title:
The baryon octet magnetic moments to all orders in flavor breaking; an
  application to the problem of the strangeness in the nucleon

abstract:
  Using the general QCD parametrization (GP) we display the magnetic moments of
the octet baryons including all flavor breaking terms to any order. The
hierarchy of the GP parameters allows to estimate a parameter $g_{0}$ related
to the quark loops contribution of the proton magnetic moment; its order of
magnitude is predicted to be inside a comparatively small interval including
the value given recently by Leinweber et al. by a lattice QCD calculation


title:
On the two-photon contributions to $e^+e^-\to\eta\gamma$ and
  $e^+e^-\to\eta^\prime\gamma$

abstract:
  Motivated by recent BABAR measurements of the $\gamma^*\to\gamma \eta$ and
$\gamma^*\to\gamma \eta^\prime $ transition form factors, we estimate
two-photon exchange contributions to the corresponding cross sections. By using
a phenomenological model, based on the vector meson dominance, it is argued
that the expected contributions are small enough not to effect the BABAR
results. As a by product we predict $Br(\eta^\prime\to\mu^+\mu^-)= (1.4\pm
0.2)\times 10^{-7}$. Our results might be useful also in high precision
calculations of radiative corrections to the Dalitz decays of pseudoscalar
mesons.


title:
The Qt distribution of the Breit current hemisphere in DIS as a probe of
  small-x broadening effects

abstract:
  We study the distribution 1/sigma dsigma/dQt, where Qt is the modulus of the
transverse momentum vector, obtained by summing over all hadrons, in the
current hemisphere of the DIS Breit frame. We resum the large logarithms in the
small Qt region, to next-to--leading logarithmic accuracy, including the
non-global logarithms involved. We point out that this observable is simply
related to the Drell-Yan vector boson and predicted Higgs Qt spectra at hadron
colliders. Comparing our predictions to existing HERA data thus ought to be a
valuable source of information on the role or absence of small-x (BFKL)
effects, neglected in conventional resummations of such quantities.


title:
Semi-Inclusive Deep Inelastic Scattering processes from small to large
  P_T

abstract:
  We consider the azimuthal and $P_T$ dependence of hadrons produced in
unpolarized Semi-Inclusive Deep Inelastic Scattering (SIDIS) processes, within
the factorized QCD parton model. It is shown that at small $P_T$ values, $P_T
\lsim 1$ GeV/c, lowest order contributions, coupled to unintegrated (Transverse
Momentum Dependent) quark distribution and fragmentation functions, describe
all data. At larger $P_T$ values, $P_T \gsim 1$ GeV/c, the usual pQCD higher
order collinear contributions dominate. Having explained the full $P_T$ range
of available data, we give new detailed predictions concerning the azimuthal
and $P_T$ dependence of hadrons which could be measured in ongoing or planned
experiments by HERMES, COMPASS and JLab collaborations.


title:
Implications of cosmic strings with time-varying tension on CMB and
  large scale structure

abstract:
  We investigate cosmological evolution and implications of cosmic strings with
time-dependent tension. We derive basic equations of time development of the
correlation length and the velocity of such strings, based on the one scale
model. Then, we find that, in the case where the tension depends on some power
of the cosmic time, cosmic strings with time-dependent tension goes into the
scaling solution if the power is lower than a critical value. We also discuss
cosmic microwave background anisotropy and matter power spectra produced by
these strings. The constraints on their tensions from the Wilkinson microwave
anisotropy probe (WMAP) three year data and Sloan digital sky survey (SDSS)
data are also given.


title: Supersymmetry and LHC

abstract:
  The motivation for introduction of supersymmetry in high energy physics as
well as a possibility for supersymmetry discovery at LHC (Large Hadronic
Collider) are discussed. The main notions of the Minimal Supersymmetric
Standard Model (MSSM) are introduced. Different regions of parameter space are
analyzed and their phenomenological properties are compared. Discovery
potential of LHC for the planned luminosity is shown for different channels.
The properties of SUSY Higgs bosons are studied and perspectives of their
observation at LHC are briefly outlined.


title: Probing Supersymmetric Parameters With Astrophysical Observations

abstract:
  A wide range of techniques have been developed to search for particle dark
matter, including direct detection, indirect detection, and collider searches.
The prospects for the detection of neutralino dark matter is quite promising
for each of these three very different methods. Looking ahead to a time in
which these techniques have successfully detected neutralino dark matter, we
explore the ability of these observations to determine the parameters of
supersymmetry. In particular, we focus on the ability of direct and indirect
detection techniques to measure the parameters $\mu$ and $m_A$. We find that
$\mu$ can be much more tightly constrained if astrophysical measurements are
considered than by LHC data alone. In supersymmetric models within the
$A$-funnel region of parameter space, we find that astrophysical measurements
can determine $m_A$ to roughly $\pm100$ GeV precision.


title: Exploiting Twistor Techniques for One-loop QCD Amplitudes

abstract:
  In this talk we describe the recursive Approach to One-loop QCD Matrix
Elements.


title: Cluster duality

abstract:
  It is well known that the linear mass spectrum of light mesons in the
large-N_c limit is dual to the perturbative QCD continuum. We find the form of
the linear spectrum which is maximally dual to the perturbation theory. The
obtained ansatz turns out to be the spectrum of the Lovelace-Shapiro dual
amplitude. This spectrum is chirally symmetric in the sense that it corresponds
to zero values for the order parameters of chiral symmetry breaking in QCD. We
further assume that the actual spectrum is dual to the maximally dual one
within the QCD sum rules based on OPE and in this way recover some known
important relations and statements. The experimental spectrum seems to support
the assumed duality: The masses of resonances cluster near certain equidistant
values of energy squared and the positions of clustering follow the maximally
dual ansatz. The latter fact signals the chiral symmetry restoration in the
excited states. We discuss also two topics of recent interest: nonlinear
corrections to the string-like spectrum and the dimension-two gluon condensate.


title: Higher Curvature Effects in ADD and RS Models

abstract:
  Over the last few years several extra-dimensional models have been introduced
in attempt to deal with the hierarchy problem. These models can lead to rather
unique and spectacular signatures at Terascale colliders such as the LHC and
ILC. The ADD and RS models, though quite distinct, have many common feature
including a constant curvature bulk, localized Standard Model(SM) fields and
the assumption of the validity of the EH action as a description of
gravitational interactions.


title:
Collider Signals of Top Quark Flavor Violation from a Warped Extra
  Dimension

abstract:
  We study top quark flavor violation in the framework of a warped extra
dimension with the Standard Model (SM) fields propagating in the bulk. Such a
scenario provides solutions to both the Planck-weak hierarchy problem and the
flavor puzzle of the SM without inducing a flavor problem. We find that,
generically, tcZ couplings receive a huge enhancement, in particular the right
handed ones can be O(1%). This results in BR(t -> c Z) at or above the
sensitivity of the Large Hadron Collider (LHC). At the International Linear
Collider (ILC), single top production, via e^+ e^- -> t \bar c, can be a
striking signal for this scenario. In particular, it represents a physics topic
of critical importance that can be explored even with a relatively low energy
option, close to the tc threshold. At both the LHC and the ILC, angular
distributions can probe the above prediction of dominance of right-handed
couplings.


title:
The Stueckelberg Z Prime at the LHC: Discovery Potential, Signature
  Spaces and Model Discrimination

abstract:
  An analysis is given of the capability of the LHC to detect narrow resonances
using high luminosities and techniques for discriminating among models are
discussed. The analysis is carried out with focus on the $U(1)_X$ Abelian
(Higgless) Stueckelberg extension of the Standard Model (StSM) gauge group
which naturally leads to a very narrow $Z'$ resonance. Comparison is made to
another class of models, i.e., models based on the warped geometry which also
lead to a narrow resonance via a massive graviton ($G$). Methods of
distinguishing the StSM $Z'$ from the massive graviton at the LHC are analyzed
using the dilepton final state in the Drell-Yan process $pp\to Z'\to l^+l^-$
and $pp\to G \to l^+l^-$. It is shown that the signature spaces in the $\sigma
\cdot Br(l^+l^-) $-resonance mass plane for the $Z$ prime and for the massive
graviton are distinct. The angular distributions in the dilepton C-M system are
also analyzed and it is shown that these distributions lie high above the
background and are distinguishable from each other. A remarkable result that
emerges from the analysis is the observation that the StSM model with $Z'$
widths even in the MeV and sub-MeV range for $Z'$ masses extending in the TeV
region can produce detectable cross section signals in the dilepton channel in
the Drell-Yan process with luminosities accessible at the LHC. While the result
is derived within the specific StSM class of models, the capability of the LHC
to probe models with narrow resonances in this range may hold more generally.


title: Q_T-Resummation for Polarized Semi-Inclusive Deep Inelastic Scattering

abstract:
  We study the transverse-momentum distribution of hadrons produced in
semi-inclusive deep-inelastic scattering. We consider cross sections for
various combinations of the polarizations of the initial lepton and nucleon or
the produced hadron, for which we perform the resummation of large
double-logarithmic perturbative corrections arising at small transverse
momentum. We present phenomenological results for the process $ep\to e\pi X$
for the typical kinematics in the COMPASS experiment. We discuss the impact of
the perturbative resummation and of estimated non-perturbative contributions on
the corresponding cross sections and their spin asymmetry.


title: Stop Decay into Right-handed Sneutrino LSP at Hadron Colliders

abstract:
  Right-handed neutrinos offer us the possibility of accommodating neutrino
masses. In a supersymmetric model, this implies the existence of right-handed
sneutrinos. Right-handed sneutrinos are expected to be as light as other
supersymmetric particles if the neutrinos are Dirac fermions, or if the
lepton-number breaking scale is at (or below) the supersymmetry (SUSY) breaking
scale, assumed to be around the electroweak scale. Depending on the mechanism
of SUSY breaking, the lightest right-handed sneutrino may be the lightest
supersymmetric particle (LSP). We consider the unique hadron collider
signatures of a weak scale right-handed sneutrino LSP, assuming R-parity
conservation. For concreteness, we concentrate on stop pair-production and
decay at the Tevatron and the Large Hadron Collider, and briefly comment on the
production and decay of other supersymmetric particles.


title: Strange axial-vector mesons mixing angle

abstract:
  The masses of the $K_1(^3P_1)$ and $K_1(^1P_1)$ are considered in a
nonrelativistic constituent quark model, and the absolute value of the
$K_1(^3P_1)-K_1(^1P_1)$ mixing angle is determined to be about $59.29^\circ$.
Comparison of the theoretical predictions on the strong decay widths of the
$K_1(1270)$ and $K_1(1400)$ in the $^3P_0$ decay model as well as the
production ratio of these two states in the $\tau$ decay between the available
experimental data strongly favors that the $K_1(^3P_1)-K_1(^1P_1)$ mixing angle
is about $+59.29^\circ$.


title: Electroweak Phase Transition and Baryogenesis in the nMSSM

abstract:
  We analyze the nMSSM with CP violation in the singlet sector. We study the
static and dynamical properties of the electroweak phase transition. We
conclude that electroweak baryogenesis in this model is generic in the sense
that if the present limits on the mass spectrum are applied, no severe
additional tuning is required to obtain a strong first-order phase transition
and to generate a sufficient baryon asymmetry. For this we determine the shape
of the nucleating bubbles, including the profiles of CP-violating phases. The
baryon asymmetry is calculated using the advanced transport theory to first and
second order in gradient expansion presented recently. Still, first and second
generation sfermions must be heavy to avoid large electric dipole moments.


title:
Extraction of proton form factors in the timelike region from
  unpolarized e+e- --> p pbar events

abstract:
  We have performed numerical simulations of the unpolarized e+e- --> p pbar
process in kinematic conditions under discussion for a possible upgrade of the
existing DAFNE facility. By fitting the cross section angular distribution with
a typical Born expression, we can extract information on the ratio |G_E/G_M| of
the proton electromagnetic form factors in the timelike region within a 5-10%
uncertainty. We have explored also non-Born contributions to the cross section
by introducing a further component in the angular fit, which is related to
two-photon exchange diagrams. We show that these corrections can be identified
if larger than 5% of the Born contribution, and if relative phases of the
complex form factors do not produce severe cancellations.


title: Spontaneous symmetry breaking in strong and electroweak interactions

abstract:
  This is the introduction to the PhD thesis, defended in June 2006. In the
original form it was appended with the reprints of the author's published
papers, and is to be regarded as their summary. Full details may be found in
the quoted papers.


title: Status of jet cross sections to NNLO

abstract:
  I review the state-of-the-art for fully differential numerical NNLO programs.
Topics which are covered include the calculation of two-loop amplitudes,
multiple polylogarithms, cancellation of infra-red divergences at NNLO and the
efficient generation of the phase space. Numerical results for e+ e- --> 2 jets
are also discussed.


title: A Minimal Type II Seesaw Model

abstract:
  We propose a minimal type II seesaw model by introducing only one
right-handed neutrino besides the $SU(2)_{L}$ triplet Higgs to the standard
model. In the usual type II seesaw models with several right-handed neutrinos,
the contributions of the right-handed neutrinos and the triplet Higgs to the CP
asymmetry, which stems from the decay of the lightest right-handed neutrino,
are proportional to their respective contributions to the light neutrino mass
matrix. However, in our minimal type II seesaw model, this CP asymmetry is just
given by the one-loop vertex correction involving the triplet Higgs, even
though the contribution of the triplet Higgs does not dominate the light
neutrino masses. For illustration, the Fritzsch-type lepton mass matrices are
considered.


title: Mixing Angles and Non-Degenerate Systems of Particles

abstract:
  Defining, in the framework of quantum field theory, their mass eigenstates
through their matricial propagator, we show why the mixing matrices of
non-degenerate coupled systems should not be parametrized as unitary. This is
how, for leptonic binary systems, two-angles solutions with discrete values
pi/4 [pi/2] and pi/2 [pi] (in addition to the trivial case 0 [pi]) arise when
weak leptonic currents of mass eigenstates approximately satisfy the two
properties of universality and vanishing of their non-diagonal neutral
components. Charged weak currents are also discussed, which leads to a few
remarks concerning oscillations. We argue that quarks, which cannot be defined
on shell because of the confinement property, are instead more naturally
endowed with unitary Cabibbo-like mixing matrices, involving a single
unconstrained mixing angle. The similarity between neutrinos and neutral kaons
is outlined, together with the role of the symmetry by exchange of families.


title:
Parton transverse momenta and direct photon production in hadronic
  collisions at high energies

abstract:
  The invariant cross sections for direct photon production in hadron-hadron
collisions are calculated for several initial energies (SPS, ISR, S$p \bar p$S,
RHIC, Tevatron, LHC) including initial parton transverse momenta within the
formalism of unintegrated parton distributions (UPDF). Different approaches
from the literature are compared and discussed. A special emphasis is put on
the Kimber-Martin-Ryskin (KMR) distributions and their extension into the soft
region. Sum rules for UPDFs are formulated and discussed in detail. We find a
violation of naive number sum rules for the KMR UPDFs. An interesting interplay
of perturbative (large $k_t^2$) and nonperturbative (small $k_t^2$) regions of
UPDFs in the production of both soft and hard photons is identified. The
$k_t$-factorization approach with the KMR UPDFs is inconsistent with the
collinear approach at large transverse momenta of photons. Kwieci\'nski UPDFs
provide very good description of all world data, especially at SPS and ISR
energies. Off-shell effects are discussed and quantified. Predictions for the
CERN LHC are given. Very forward/backward regions in rapidity at LHC energy are
discussed and a possibility to test unintegrated gluon distributions (UGDF) is
presented.


title: Energy flow between jets in the kt algorithm

abstract:
  We consider the impact of the kt algorithm on energy flow into gaps between
jets in any QCD hard process. While we confirm the observation that the kt
clustering procedure considerably reduces the impact of non-global logarithms,
we unearth yet new sources of logarithmic enhancement, that stem from using the
$k_t$ algorithm to define the final state. We comment on the nature of the
logarithms we find and discuss their all-orders treatment.


title: Axion alternatives

abstract:
  If recent results of the PVLAS collaboration proved to be correct, some
alternative to the traditional axion models are needed. We present one of the
simplest possible modifications of axion paradigm, which explains the results
of PVLAS experiment, while avoiding all the astrophysical and cosmological
restrictions. We also mention other possible models that possess similar
effects.


title: Parton Distributions - DIS06

abstract:
  I discuss the current status of parton distributions. I outline the wide
variety of different parton distributions available, and highlight which are
either necessary or suitable for use at present.


title: Spin 3/2 Beyond the Rarita-Schwinger Framework

abstract:
  We employ the two independent Casimir operators of the Poincare group, the
squared four--momentum, P^2, and the squared Pauli-Lubanski vector, W^2, in the
construction of a covariant mass-m, and spin-3/2 projector in the
four-vector-spinor, \psi_{\mu}. This projector provides the basis for the
construction of an interacting Lagrangian that describes a causally propagating
spin-3/2} particle coupled to the electromagnetic field by a gyromagnetic ratio
of g_{3/2}=2.


title: NNLO analysis of unpolarized DIS structure functions

abstract:
  We present the results of a NNLO QCD analysis of the World data on
unpolarized DIS Non-Singlet Structure functions.


title: Light meson spectrum and classical symmetries of QCD

abstract:
  Modern spectroscopic data on light non-strange meson spectrum is analyzed. It
is argued that the observed regularities of experimental spectrum for highly
excited states favour a partial restoration of all approximate classical
symmetries of QCD Lagrangian (conformal, chiral and axial) broken by the
quantum corrections. The rate of restoration of classical symmetries is
estimated. The dependence of the resonance widths from the corresponding masses
is systematically checked. On average, it turns out to be universal for the
high excitations as predicted by the effective string description.


title:
Ultra high energy neutrino-nucleon cross section from cosmic ray
  experiments and neutrino telescopes

abstract:
  We deduce the cosmogenic neutrino flux by jointly analysing ultra high energy
cosmic ray data from HiRes-I and II, AGASA and the Pierre Auger Observatory. We
make two determinations of the neutrino flux by using a model-dependent method
and a model-independent method. The former is well-known, and involves the use
of a power-law injection spectrum. The latter is a regularized unfolding
procedure. We then use neutrino flux bounds obtained by the RICE experiment to
constrain the neutrino-nucleon inelastic cross section at energies inaccessible
at colliders. The cross section bounds obtained using the cosmogenic fluxes
derived by unfolding are the most model-independent bounds to date.


title: Parton Energy Loss at Twist-Six in Deeply Inelastic e-A Scattering

abstract:
  Within the framework of the generalized factorization in pQCD, we investigate
the multiple parton scattering and induced parton energy loss at twist-6 in
deeply inelastic e-A scattering with the helicity amplitude approximation. It
is shown that twist-6 processes will give rise to additional nuclear size
dependence of the parton energy loss due to LPM interference effect while its
contribution is power suppressed.


title: Remodeling the Pentagon After the Events of 2/23/06

abstract:
  The meta-stable SUSY breaking mechanism of Intriligator Seiberg and Shih can
be used to simplify the Pentagon model of TeV scale physics. The simplified
model has only a single scalar field and no troublesome low energy axion. One
significant signature is $l^+ l^- X$ plus missing energy, where $X$ might be
the two photons of gauge mediated models, but is likely to be different. There
is a new strongly interacting sector with a scale around 1.5 TeV. The
penta-hadrons of this sector have masses of order 6 TeV or more. Dark matter is
probably the pseudo-goldstone boson of spontaneously broken penta-baryon
number. This can be a viable dark matter candidate if an appropriate asymmetry
in penta-baryon number is generated in the early universe. The pseudo-Goldstone
particle has a mass of $\sim 1$ eV and is produced predominantly in flavor
changing charged current decays of ordinary particles. The model solves the
flavor problems of SUSY, but has two low energy CP violating phases, whose
value is strongly constrained by experiment.


title: Scalar and vector meson exchange in V->P0P0gamma decays

abstract:
  The scalar contributions to the radiative decays of light vector mesons into
a pair of neutral pseudoscalars, $V\to P^0P^0\gamma$, are studied within the
framework of the Linear Sigma Model. This model has the advantage of
incorporating not only the scalar resonances in an explicit way but also the
constraints required by chiral symmetry. The experimental data on
$\phi\to\pi^0\pi^0\gamma$, $\phi\to\pi^0\eta\gamma$, $\rho\to\pi^0\pi^0\gamma$
and $\omega\to\pi^0\pi^0\gamma$ are satisfactorily accommodated in our
framework. Theoretical predictions for $\phi\to K^0\bar K^0\gamma$,
$\rho\to\pi^0\eta\gamma$, $\omega\to\pi^0\eta\gamma$ and the ratio $\phi\to
f_0\gamma/a_0\gamma$ are also given.


title: Regge-cascade hadronization

abstract:
  We argue that the evolution of coloured partons into colour-singlet hadrons
has approximate factorization into an extended parton-shower phase and a
colour-singlet resonance--pole phase. The amplitude for the conversion of
colour connected partons into hadrons necessarily resembles Regge-pole
amplitudes since qq-bar resonance amplitudes and Regge-pole amplitudes are
related by duality. A `Regge-cascade' factorization property of the N-point
Veneziano amplitude provides further justification of this protocol. This
latter factorization property, in turn, allows the construction of general
multi-hadron amplitudes in amplitude-squared factorized form from (1->2) link
amplitudes. We suggest an algorithm with cascade-decay configuration, ordered
in the transverse momentum, suitable for Monte-Carlo simulation. We make a
simple implementation of this procedure in Herwig++, obtaining some improvement
to the description of the event-shape distributions at LEP.


title: Wakes in the quark-gluon plasma

abstract:
  Using the high temperature approximation we study, within the linear response
theory, the wake in the quark-gluon plasma by a fast parton owing to dynamical
screening in the space like region. When the parton moves with a speed less
than the average speed of the plasmon, we find that the wake structure
corresponds to a screening charge cloud traveling with the parton with one sign
flip in the induced charge density resulting in a Lennard-Jones type potential
in the outward flow with a short range repulsive and a long range attractive
part. On the other hand if the parton moves with a speed higher than that of
plasmon, the wake structure in the induced charge density is found to have
alternate sign flips and the wake potential in the outward flow oscillates
analogous to Cerenkov like wave generation with a Mach cone structure trailing
the moving parton. The potential normal to the motion of the parton indicates a
transverse flow in the system. We also calculate the potential due to a color
dipole and discuss consequences of possible new bound states and $J/\psi$
suppression in the quark-gluon plasma.


title:
Time Variations of the Solar Neutrino Flux Data from Sudbury Neutrino
  Observatory

abstract:
  We have used the Ferraz-Mello Method of Date Compensated Discrete Fourier
Transform on the solar neutrino flux data from the Sudbury Neutrino Observatory
(SNO) in order to search for its time variation. We present results from
Ferraz-Mello Method for both pure D2O and salt phase data sets from SNO. For
the D2O data the obtained periods are 5.36, 14.99, 23.06, 40.31, 65.63, 115.03,
131.27, 152.67, 188.74, 294.49 and 412.79 days and for the salt phase data the
periods are obtained at around 37.84, 43.89, 59.17, 67.48, 72.47, 78.52, 86.54,
95.91, 109.83 and 317.01 days. For all the obtained periods the levels of
confidence are sufficiently higher than 95 percent.


title: New one-loop techniques and first applications to LHC phenomenology

abstract:
  In this talk we describe our approach for the computation of multi-leg
one-loop amplitudes and present some first results relevant for LHC
phenomenology.


title:
The Renyi entropy H_2 as a rigorous, measurable lower bound for the
  entropy of the interaction region in multiparticle production processes

abstract:
  A model-independent lower bound on the entropy S of the multiparticle system
produced in high energy collisions, provided by the Renyi entropy H_2, is shown
to be very effective. Estimates show that the ratio H_2/S remains close to one
half for all realistic values of the parameters.


title: HELAC - A Monte Carlo generator for multi-jet processes

abstract:
  The status of the multi-purpose event generator HELAC is briefly presented.
The aim of this tool is the full simulation of events within the Standard Model
at current and future high energy experiments, in particular the LHC. Some
results related to the production of multi-jet final states at the LHC are also
discussed.


title:
A Black Hole Conjecture and Rare Decays in Theories with Low Scale
  Gravity

abstract:
  In models with large extra dimensions, where the fundamental gravity scale
can be in the electroweak range, gravitational effects in particle physics may
be noticeable even at relatively low energies. In this paper, we perform simple
estimates of the decays of elementary particles with a black hole intermediate
state. Since black holes are believed to violate global symmetries, particle
decays can violate lepton and baryon numbers. Whereas previous literature has
claimed incompatibility between these rates (e.g. $p$-decay) and existing
experimental bounds, we find suppressed baryon and lepton-violating rates due
to a new conjecture about the nature of the virtual black holes. We assume here
that black holes lighter than the (effective) Planck mass must have zero
electric and color charge and zero angular momentum -- this statement is true
in classical general relativity and we make the conjecture that it holds in
quantum gravity as well. If true, the rates for proton-decay,
neutron-antineutron oscillations, and lepton-violating rare decays are
suppressed to below experimental bounds even for large extra dimensions with
TeV-scale gravity. Neutron-antineutron oscillations and anomalous decays of
muons, $\tau$-leptons, and $K$ and $B$-mesons open a promising possibility to
observe TeV gravity effects with a minor increase of existing experimental
accuracy.


title: New Two-loop Contributions to Hadronic EDMs in the MSSM

abstract:
  Flavor-changing terms with CP-violating phases in the quark sector may
contribute to the hadronic electric dipole moments (EDMs). However, within the
Standard Model (SM), the source of CP violation comes from the unique CKM
phase, and it turns out that the EDMs are strongly suppressed. This implies
that the EDMs are very sensitive to non-minimal flavor violation structures of
theories beyond the SM. In this paper, we discuss the quark EDMs and CEDMs
(chromoelectric dipole moments) in the MSSM with general flavor-changing terms
in the squark mass matrices. In particular, the charged-Higgs mediated
contributions to the down-quark EDM and CEDM are evaluated at two-loop level.
We point out that these two-loop contributions may dominate over the one-loop
induced gluino or Higgsino contributions even when the squark and gluino masses
are around few TeV and \tan\beta is moderate.


title: How Resummation Depresses the Gluon at Small x

abstract:
  We summarize recent progress in the resummation of perturbative evolution at
small x. We show that the problem of incorporating BFKL small x logs in GLAP
evolution is now completely solved, and that the main effect of small x
resummation is to reduce the growth of the gluon at small x in the HERA and LHC
regions.


title:
Power Corrections in Charmless Nonleptonic B-Decays: Annihilation is
  Factorizable and Real

abstract:
  We classify LambdaQCD/mb power corrections to nonleptonic B-> M1 M2 decays,
where M1 and M2 are charmless non-isosinglet mesons. Using recent developments
in soft-collinear effective theory, we prove that the leading contributions to
annihilation amplitudes of O[alphas(mb) LambdaQCD/mb] are real. The leading
annihilation amplitudes depend on twist-2 and twist-3 three parton
distributions. A complex nonperturbative parameter from annihilation first
appears at O[alphas^2(sqrt{Lambda mb}) LambdaQCD/mb]. ``Chirally enhanced''
contributions are also factorizable and real at lowest order. Thus,
incalculable strong phases are suppressed in annihilation amplitudes, unless
the alphas(sqrt{Lambda mb}) expansion breaks down. Modeling the distribution
functions, we find that (11 +- 9)% and (15 +- 11)% of the absolute value of the
measured B-> K- pi+ and B-> K- K0 penguin amplitudes come from annihilation.
This is consistent with the expected size of power corrections.


title: What if supersymmetry breaking appears below the GUT scale?

abstract:
  We consider the possibility that the soft supersymmetry-breaking parameters
m_{1/2} and m_0 of the MSSM are universal at some scale M_{in} below the
supersymmetric grand unification scale M_{GUT}, as might occur in scenarios
where either the primordial supersymmetry-breaking mechanism or its
communication to the observable sector involve a dynamical scale below M_{GUT}.
We analyze the (m_{1/2}, m_0) planes of such sub-GUT CMSSM models, noting the
dependences of phenomenological, experimental and cosmological constraints on
M_{in}. In particular, we find that the coannihilation, focus-point and
rapid-annihilation funnel regions of the GUT-scale CMSSM approach and merge
when M_{in} \sim 10^{12} GeV. We discuss sparticle spectra and the possible
sensitivity of LHC measurements to the value of M_{in}.


title:
QCD Factorization for Deep-Inelastic Scattering At Large Bjorken $x_B
  \sim 1-{\cal O}(\Lambda_{\rm QCD}/Q$

abstract:
  We study deep-inelastic scattering factorization on a nucleon in the
end-point regime $x_B \sim 1-{\cal O}(\Lambda_{\rm QCD}/Q)$ where the
traditional operator product expansion is supposed to fail. We argue,
nevertheless, that the standard result holds to leading order in $1-x_B$ due to
the absence of the scale dependence on $(1-x_B)Q$. Refactorization of the scale
$(1-x_B)Q^2$ in the coefficient function can be made in the soft-collinear
effective theory and remains valid in the end-point regime. On the other hand,
the traditional refactorization approach introduces the spurious scale
$(1-x_B)Q$ in various factors, which drives them nonperturbative in the region
of our interest. We show how to improve the situation by introducing a rapidity
cut-off scheme, and how to recover the effective theory refactorization by
choosing appropriately the cut-off parameter. Through a one-loop calculation,
we demonstrate explicitly that the proper soft subtractions must be made in the
collinear matrix elements to avoid double counting.


title: Semi-inclusive hadronic B decays in the endpoint region

abstract:
  We consider in the soft-collinear effective theory semi-inclusive hadronic B
decays, B-> XM, in which an energetic light meson M near the endpoint recoils
against an inclusive jet X. We focus on a subset of decays where the spectator
quark from the B meson ends up in the jet. The branching ratios and direct CP
asymmetries are computed to next-to-leading order accuracy in alpha_s and to
leading order in 1/m_b. The contribution of charming penguins is extensively
discussed, and a method to extract it in semi-inclusive decays is suggested.
Subleading 1/m_b corrections and SU(3) breaking effects are discussed.


title: Dilepton Production In Non-equilibriated Quark Gluon Plasma

abstract:
  A model of cut-off momentum distribution functions in a Quark Gluon Plasma
with finite baryon chemical potential is discussed. This produces a quark gluon
plasma signature in Ultra Relativistic Nuclear Collisions with a specific
structure of the dilepton spectrum in the transverse momentum region of
$(1-4)~GeV$ and the dilepton production rate is found to be a strong decreasing
function of the chemical potential.


title: Hypergeometric representation of a four-loop vacuum bubble

abstract:
  In this article, we present a new analytic result for a certain
single-mass-scale four-loop vacuum (bubble) integral. We also discuss its
systematic $\e$-expansion in $d=4-2\e$ as well as $d=3-2\e$ dimensions, the
coefficients of which are expressible in terms of harmonic sums at infinity.


title:
Connection Between $\nu_e, \nu_\mu, \nu_\tau$ and $\nu_1, \nu_2, \nu_3$
  Neutrino States and Time Dependence of Neutrino Wave Functions and Transition
  Probabilities at Three Neutrino Oscillations in Vacuum

abstract:
  For description of the $d, s, b$ quark mixings the Cabibbo-Kobayashi-Maskawa
matrices are used but they do not contain the time dependence. In this work the
analogous matrix is obtained for the case of three neutrino ($\nu_{e}, \nu_{\mu
}, \nu_{\tau}$) mixings (oscillations) in vacuum in the general case, when CP
violation is absent. In contrast to the quark case this matrix contains the
time dependence. The matrix for probability of neutrino transitions
(oscillations) in vacuum is also obtained. Naturally, it contains the time
dependence. The matrix which does not contain the time dependence is obtained
by using time $t$ averaging of this matrix. Elements of this matrix can be used
to describe neutrino decays.


title: Measuring Leptonic CP Violation with a Water Cerenkov

abstract:
  In this talk, we present the physics case for a megaton Water Cerenkov
detector in addressing some of the still pending questions in neutrino
oscillations physics, particularly the measurement of leptonic CP violation. We
compare different future beams that could profit from a water detector and
analyse, for the case $\theta_{13} \approx 3^\circ$ (the limit that can be
reached by under-construction experiments), the signal-to-background rate for a
$\beta$-beam setup with the radioactive ions accelerated to $\gamma = 350$.


title: Calculation of the Branching Ratio of $B^{-}\to h_{c}+K^{-}$ in PQCD

abstract:
  The branching ratio of $B^-\to h_c+K^-$ is re-evaluated in the PQCD approach.
In this theoretical framework all the phenomenological parameters in the
wavefunctions and Sudakov factor are priori fixed by fitting other experimental
data, and in the whole numerical computations we do not introduce any new
parameter. Our results are consistent with the upper bounds set by the Babar
and Belle measurements.


title:
Fermion masses and the symmetry breaking; Strong interactions spin
  quantum number as the unifier of the strong and electroweak interactions

abstract:
  The origin of the fermion generations is discussed. A strong interactions
spin $I_{S}$ is introduced which unifies the quarks and leptons as two
multiplets of this spin. The electroweak vector bosons and gluons emerge as the
fused states of these fermion multiplets.


title: Unitarity Cuts: NLO Six-Gluon Amplitudes in QCD

abstract:
  We report on a technique for evaluating finite unitarity cut for one-loop
amplitudes in gauge theories, and discuss its application to the
cut-constructible part of six-gluon amplitude in QCD.


title: Constraints on Minimal SUSY models with warm dark matter neutralinos

abstract:
  If the energy density of the Universe before nucleosynthesis is dominated by
a scalar field $\phi$ that decays and reheats the plasma to a low reheating
temperature $T_{RH}$, neutralinos may be warm dark matter particles. We study
this possibility and derive the conditions on the production mechanism and on
the supersymmetric spectrum for which it is viable. Large values of the $\mu$
parameter and of the slepton masses are characteristic features of these
models. We compute the expected direct detection cross sections and point out
that Split-SUSY provides a natural framework for neutralino warm dark matter


title:
Probing space-time structure of new physics with polarized beams at the
  ILC

abstract:
  At the International Linear Collider large beam polarization of both the
electron and positron beams will enhance the signature of physics due to
interactions that are beyond the Standard Model. Here we review our recently
obtained results on a general model independent method of determining for an
arbitary one-particle inclusive state the space-time structure of such new
physics through the beam polarization dependence and angular distribution of
the final state particle.


title: All One-loop Maximally Helicity Violating Gluonic Amplitudes in QCD

abstract:
  We use on-shell recursion relations to compute analytically the one-loop
corrections to maximally-helicity-violating n-gluon amplitudes in QCD. The
cut-containing parts have been computed previously; our work supplies the
remaining rational parts for these amplitudes, which contain two gluons of
negative helicity and the rest positive, in an arbitrary color ordering. We
also present formulae specific to the six-gluon cases, with helicities (- + - +
+ +) and (- + + - + +), as well as numerical results for six, seven, and eight
gluons. Our construction of the n-gluon amplitudes illustrates the relatively
modest growth in complexity of the on-shell-recursive calculation as the number
of external legs increases. These amplitudes add to the growing body of
one-loop amplitudes known for all n, which are useful for studies of general
properties of amplitudes, including their twistor-space structure.


title: The rational parts of one-loop QCD amplitudes I: The general formalism

abstract:
  A general formalism for computing only the rational parts of oneloop QCD
amplitudes is developed. Starting from the Feynman integral representation of
the one-loop amplitude, we use tensor reduction and recursive relations to
compute the rational parts directly. Explicit formulas for the rational parts
are given for all bubble and triangle integrals. Formulas are also given for
box integrals up to two-masshard boxes which are the needed ingredients to
compute up to 6-gluon QCD amplitudes. We use this method to compute explicitly
the rational parts of the 5- and 6-gluon QCD amplitudes in two accompanying
papers.


title: The rational parts of one-loop QCD amplitudes II: The five-gluon case

abstract:
  The rational parts of 5-gluon one-loop amplitudes are computed by using the
newly developed method for computing the rational parts directly from Feynman
integrals. We found complete agreement with the previously well-known results
of Bern, Dixon and Kosower obtained by using the string theory method.
Intermediate results for some combinations of Feynman diagrams are presented in
order to show the efficiency of the method and the local cancellation between
different contributions.


title: The rational parts of one-loop QCD amplitudes III: The six-gluon case

abstract:
  The rational parts of 6-gluon one-loop amplitudes with scalars circulating in
the loop are computed by using the newly developed method for computing the
rational parts directly from Feynman integrals. We present the analytic results
for the two MHV helicity configurations: $(1^-2^+3^+4^-5^+6^+)$ and
$(1^-2^+3^-4^+5^+6^+)$, and the two NMHV helicity configurations:
$(1^-2^-3^+4^-5^+6^+)$ and $(1^-2^+3^-4^+5^-6^+)$. Combined with the previously
computed results for the cut-constructible part, our results are the last
missing pieces for the complete partial helicity amplitudes of the 6-gluon
one-loop QCD amplitude.


title: Soft-gluon effects in the H -> WW search channel at the LHC

abstract:
  Non resonant production of WW pairs is the most important background in the
Higgs search in the range 155 \ltap M_H \ltap 170 GeV at the LHC. We consider
QCD corrections to WW pair production in hadron collisions and present a
calculation which consistently combines NLO corrections with soft-gluon
resummation at small transverse momenta of the WW pair. Spin correlations are
fully taken into account in our calculation. We study the impact of the
resummation on the leptonic observables and perform a comparison with results
obtained at NLO and with the MC@NLO event generator.


title: Scalar QED, NLO and PHOTOS Monte Carlo

abstract:
  Recently, QED bremsstrahlung in $B$-meson decays into pair of scalars (\pi's
and/or K's) is of interest. If experimental acceptance must be taken into
account, PHOTOS Monte Carlo is often used in experimental simulations. We will
use scalar QED to benchmark PHOTOS, even though this theory is of limited use
for complex objects. We present the analytical form of the kernel used in the
older versions of PHOTOS, and the new, exact (scalar QED) one. Matrix element
and phase-space Jacobians are separated in the final weight and future
extensions based on measurable electromagnetic form-factors are thus possible.
The massive phase-space is controlled in the the program with no
approximations. Thanks to the iterative solution all leading and next to
leading logarithmic terms are properly reproduced by the Monte Carlo
simulation. Simultaneously, full differential distributions over complete
multiple body phase-space are provided. An agreement of better than 0.01% with
independent calculations of scalar QED is demonstrated.


title: Unitarity of the Leptonic Mixing Matrix

abstract:
  We determine the elements of the leptonic mixing matrix, without assuming
unitarity, combining data from neutrino oscillation experiments and weak
decays. To that end, we first develop a formalism for studying neutrino
oscillations in vacuum and matter when the leptonic mixing matrix is not
unitary. To be conservative, only three light neutrino species are considered,
whose propagation is generically affected by non-unitary effects. Precision
improvements within future facilities are discussed as well.


title: Gap Equations and Electroweak Symmetry Breaking

abstract:
  Recently a new dynamical symmetry breaking model of electroweak interactions
was proposed based on interacting fermions. Two fermions of different SU(2)
representations form a symmetry breaking condensate and generate the lepton and
quark masses. The weak gauge bosons get their usual standard model masses from
a gauge invariant Lagrangian of a composite doublet scalar field. The new
fermion fields become massive by condensation. In this note the gap equations
are given in the linearized (mean field) approximation and the conditions for
symmetry breaking and mass generation are presented. Perturbative unitarity
constrains the self-couplings and the masses of the new fermions, a raw
spectrum is given.


title: Power-suppressed effects in heavy quark fragmentation functions

abstract:
  This talk summarizes the results of a phenomenological analysis of heavy
quark fragmentation data published by the CLEO and BELLE collaborations at
\sqrt{s} = 10.6 GeV and by the LEP collaborations at \sqrt{s} = 91.2 GeV.
Several theoretical ingredients are employed: next-to-leading order initial
conditions, evolution and coefficient functions; soft-gluon resummation to
next-to-leading-log accuracy; a next-to-leading order matching condition for
the crossing of the bottom threshold in the evolution. Important initial-state
electromagnetic radiation effects in the CLEO and BELLE data are also accounted
for. We find that with reasonably simple choices of a non-perturbative
correction to the fixed-order initial condition for the evolution, the data
from CLEO and BELLE can be fitted with remarkable accuracy. The fitted
fragmentation function, when evolved to LEP energies, does not however
represent fairly the D* fragmentation spectrum measured by ALEPH. Large
non-perturbative corrections to the coefficient functions of the meson spectrum
are needed in order to reconcile CLEO/BELLE and ALEPH results.


title: On covariant nonlocal chiral quark models with separable interactions

abstract:
  We present a comparative analysis of chiral quark models which include
nonlocal covariant four-fermion couplings. We consider two alternative ways of
introducing the nonlocality, as well as various shapes for the
momentum-dependent form factors governing the effective interactions. In all
cases we study the behavior of model parameters and analyze numerical results
for constituent quark masses and quark propagator poles. Advantages of these
covariant nonlocal schemes over instantaneous nonlocal schemes and the standard
NJL model are pointed out.


title: Perturbative power Q^2-corrections to the structure function g(1)

abstract:
  We prove that regulating infrared divergencies generates power (~1/(Q^2)^k)
corrections to the spin structure function g_1 at small x and large Q^2. At the
same time it leads to the corrections ~(Q^2)^k at small Q^2. We present the
explicit series of such terms as well as the formulae for their resummation.
These contributions are not included in the standard analysis of the
experimental data. We argue that accounting for such terms can sizably change
the impact of the other power corrections conventionally attributed to the
higher twists.


title: QCD at hadron colliders

abstract:
  QCD is an extensively developed and tested gauge theory, which models the
strong interactions in the high-energy regime. In this talk, I shall review the
considerable progress which has been achieved in the last few years in the most
actively studied QCD topics: Monte Carlo models, higher-order corrections, and
parton distribution functions. Thanks to that, QCD in the high-energy regime is
becoming more and more an essential precision toolkit to analyse Higgs and New
Physics scenarios at the LHC.


title: The Spatial String Tension, Thermal Phase Transition, and AdS/QCD

abstract:
  We present results of modeling the temperature dependence of the spatial
string tension and thermal phase transition in a five-dimensional framework
nowadays known as AdS/QCD. For temperatures close to the critical one we find a
behaviour remarkably consistent with the lattice results.


title:
Extra dimensions in CERN LHC via mini-black holes: effective Kerr-Newman
  brane-world effects

abstract:
  We solve Einstein equations on the brane to derive the exact form of the
braneworld-corrected perturbations in Kerr-Newman singularities, using
Randall-Sundrum and Arkani-Hamed-Dimopoulos-Dvali (ADD) models. It is a
consequence of such models the possibility that Kerr-Newman mini-black holes
can be produced in LHC. We use this approach to derive a normalized correction
for the Schwarzschild Myers-Perry radius of a static $(4+n)$-dimensional
mini-black hole, using more realistic approaches arising from Kerr-Newman
mini-black hole analysis. Besides, we prove that there are four Kerr-Newman
black hole horizons in braneworld scenario we use, although only the outer
horizon is relevant in the physical measurable processes. Parton cross sections
in LHC and Hawking temperature are also investigated as functions of Planck
mass (in the LHC range 1-10 TeV), mini-black hole mass and the number of large
extra dimensions in braneworld large extra-dimensional scenarios. In this case
a more realistic brane effect-corrected formalism can achieve more precisely
the effective extra-dimensional Planck mass and the number of large extra
dimensions -- in Arkani-Hamed-Dimopoulos-Dvali model -- or the size of the
warped extra dimension -- in Randall-Sundrum formalism.