title:
Exact solution for oscillations of two neutrinos within alternative
  theory of neutrino oscillations

abstract:
  We present one point of contact between the standard theory of neutrino
oscillations and the alternative one, in which flavor neutrinos are described
by states with definite masses. We show that both theories give the same
results for static neutrinos only.


title: Exact Evolution of the Complete Non-Linear Cosmological Radion

abstract:
  The cosmological two brane model is discussed in detail. An elegant method
for deriving the generalised non-linear equations for the interbrane distance
is presented. These equations are used to identify equilibrium positions of the
radion, and are then linearised in order to determine the nature of these
equilibrium solutions. Numerical methods are then employed to determine the
complete behaviour of the (unstabilised) cosmological radion for a variety of
interesting cases, including radiation and matter dominated non-Z_2 symmetric
branes. The implications to theories involving brane collisions are then
discussed.


title: Factorization Breaking in Diffractive Photoproduction of Dijets

abstract:
  We have calculated the diffractive dijet cross section in low-Q^2 ep
scattering in the HERA regime. The results of the calculation in LO and NLO are
compared to recent experimental data of the H1 collaboration. We find that in
LO the calculated cross sections are in reasonable agreement with the
experimental results. In NLO, however, some of the cross sections disagree,
showing that factorization breaking occurs in that order. By suppressing the
resolved contribution by a factor of approximately three, good agreement with
all the data is found. The size of the factorization breaking effects in
diffractive dijet photoproduction agrees well with absorptive model
predictions.


title: Relic Neutrino Absorption Spectroscopy

abstract:
  Resonant annihilation of extremely high-energy cosmic neutrinos on big-bang
relic anti-neutrinos (and vice versa) into Z-bosons leads to sizable absorption
dips in the neutrino flux to be observed at Earth. The high-energy edges of
these dips are fixed, via the resonance energies, by the neutrino masses alone.
Their depths are determined by the cosmic neutrino background density, by the
cosmological parameters determining the expansion rate of the universe, and by
the large redshift history of the cosmic neutrino sources. We investigate the
possibility of determining the existence of the cosmic neutrino background
within the next decade from a measurement of these absorption dips in the
neutrino flux. As a by-product, we study the prospects to infer the absolute
neutrino mass scale. We find that, with the presently planned neutrino
detectors (ANITA, Auger, EUSO, OWL, RICE, and SalSA) operating in the relevant
energy regime above 10^{21} eV, relic neutrino absorption spectroscopy becomes
a realistic possibility. It requires, however, the existence of extremely
powerful neutrino sources, which should be opaque to nucleons and high-energy
photons to evade present constraints. Furthermore, the neutrino mass spectrum
must be quasi-degenerate to optimize the dip, which implies m_{nu} >~ 0.1 eV
for the lightest neutrino. With a second generation of neutrino detectors,
these demanding requirements can be relaxed considerably.


title: HadAtom03

abstract:
  These are the proceedings of the workshop "HadAtom03," held at the European
Centre for Theoretical Nuclear Physics and Related Studies (ECT*), Trento
(Italy), October 13 - 17, 2003. The main topics discussed at the workshop were
the physics of hadronic atoms and in this context recent results in experiment
and theory. Included here are the list of participants, the scientific program
and a short contribution from each speaker.


title: Colour Reconnection at LEP

abstract:
  Two measurements are presented of estimators sensitive to the Colour
Reconnection effect in WW events at LEP2. The results are compared with various
phenomenological Monte Carlo implementations of the effect. A feasibility study
is performed to reduce the total uncertainty in the direct W boson mass
measurement at LEP2 by use of the inferred information about the Colour
Reconnection effect.


title: On Deviations from Bimaximal Neutrino Mixing

abstract:
  The PMNS neutrino mixing matrix U_{PMNS} is in general a product of two
unitary matrices U_{lep} and U_{\nu} arising from the diagonalization of the
charged lepton and neutrino mass matrices, U_{PMNS} = U^{\dagger}_{lep}
U_{\nu}. Assuming that U_{\nu} is a bimaximal mixing matrix, we investigate the
possible forms of U_{lep}. We identify three possible generic structures of
U_{lep}, which are compatible with the existing data on neutrino mixing. One
corresponds to a hierarchical ``CKM-like'' matrix. In this case relatively
large values of the solar neutrino mixing angle \theta_{sol}, and of
|U_{e3}|^2, are typically predicted, \tan^2\theta_{sol} \gtap 0.42, |U_{e3}|^2
\gtap 0.02, while the atmospheric neutrino mixing angle \theta_{atm} can
deviate noticeably from \pi/4, \sin^2 2\theta_{atm} \gtap 0.95. The second
corresponds to one of the mixing angles in U_{lep} being equal to \pi/2, and
predicts practically maximal atmospheric neutrino mixing \sin^2 2\theta_{atm}
\simeq 1. Large atmospheric neutrino mixing, \sin^2 2\theta_{atm} \gtap 0.95,
is naturally predicted by the third possible generic structure of U_{lep},
which corresponds to all three mixing angles in U_{lep} being large. We focus
especially on the case of CP-nonconservation, analyzing it in detail. We show
how the CP-violating phases, arising from the diagonalization of the neutrino
and charged lepton mass matrices, contribute to the measured neutrino mixing
observables.


title: $\epsilon$-Expansion for non-planar double-boxes

abstract:
  We present calculations for non-planar double-box with four massless/massive
external/internal legs/propagators. The results are expressed for arbitrary
exponents of propagators and dimension in terms of Lauricella's hypergeometric
functions of three variables and hypergeometric-like multiple series.


title:
Bounds on the magnetic moment and electric dipole moment of the
  $\tau$-neutrino via the process $e^{+}e^{-}\to \nu \bar \nu \gamma$

abstract:
  Bounds on the anomalous magnetic moment and the electric dipole moment of the
$\tau$-neutrino are calculated through the reaction $e^{+}e^{-}\to \nu \bar \nu
\gamma$ at the $Z_1$-pole, and in the framework of a left-right symmetric
model. The results are based on the recent data reported by the L3
Collaboration at CERN LEP. We find that the bounds are almost independent of
the mixing angle $\phi$ of the model in the allowed experimental range for this
parameter. In addition, the analytical and numerical results for the
cross-section have never been reported in the literature before.


title:
W^+ W^+ Scattering as a Sensitive Test of the Anomalous Gauge Couplings
  of the Higgs Boson at the LHC

abstract:
  We propose a sensitive way to test the anomalous HVV couplings (V=W^\pm, Z^0)
of the Higgs boson (H), which can arise from either the dimension-3 effective
operator in a nonlinearly realized Higgs sector or the dimension-6 effective
operators in a linearly realized Higgs sector, via studying the VV scattering
processes at the CERN Large Hadron Collider (LHC). We show that, with an
integrated luminosity of 300 fb^{-1} and sufficient kinematical cuts for
suppressing the backgrounds, studying the process pp \to W^+ W^+ j j \to \l^+
\nu \l^+ \nu j j can probe the anomalous HWW couplings at a few tens of percent
level for the nonlinearly realized Higgs sector, and at the level of 0.01-0.08
TeV^{-1} for the linearly realized effective Lagrangian.


title:
Charmonium levels near threshold and the narrow state $X(3872) \to
  \pi^{+}\pi^{-}\jpsi$

abstract:
  We explore the influence of open-charm channels on charmonium properties, and
profile the 1:3D2, 1:3D3 and 2:1P1 charmonium candidates for X(3872). The
favored candidates, the 1:3D2 and 1:3D3 levels, both have prominent radiative
decays. The 1:3D2 might be visible in the $D^{0}\bar{D}^{*0}$ channel, while
the dominant decay of the 1:3D3 state should be into $D\bar{D}$. We propose
that additional discrete charmonium levels can be discovered as narrow
resonances of charmed and anticharmed mesons.


title: Precision Electro-Weak and Hadronic Luminosity Calculations

abstract:
  We have used YFS Monte Carlo techniques to obtain per-mil level accuracy for
the Bhabha scattering cross section used in the luminosity monitor in
electro-weak scattering experiments. We will describe techniques for extending
these methods for use in the W production luminosity cross section for hadron
colliders.


title:
Further thoughts on supersymmetric $E_8$ as a family and grand
  unification theory

abstract:
  We continue the analysis of the possibility of supersymmetric $E_8$ as a
family unification and grand unification theory, this time under the assumption
that there is a vacuum gluino condensate, but that this condensate is {\it not}
accompanied by dynamical generation of a mass gap in the pure $E_8$ gauge
theory. Arguments supporting these assumptions are given. When the $E_8$ theory
is coupled to supergravity, assuming vanishing of the cosmological constant and
a supersymmetry breaking scale of around a TeV, we show that the gluino mass
induced by gravitational coupling to the condensate is of order $10^{-3}$ eV or
smaller, compatible with the fermion (and particularly the neutrino) mass
spectrum. We suggest that composite scalar Higgs superfields can arise from a
chiral glueball in the attractive 3875 channel (and possibly other channels),
permitting the breaking of the original $E_8$ gauge group to a SO(10) grand
unification group, times a SU(3) family symmetry group and an extra U(1)
factor. A general analysis of the Higgs superpotential shows that in the
absence of gravitational couplings, there is always a supersymmetric vacuum in
the (unphysical) limit of infinite Higgs superfields. However, when
gravitational couplings are included, dimensional analysis of the
superpotential shows that the vacuum can be stabilized for finite Higgs
superfields, with the occurrence of dynamical ${\cal F}$-type supersymmetry
breaking. We conclude that an $E_8$ unification may be theoretically viable,
providing an alternative paradigm for low energy model building, in which the
supersymmetric partners of the standard model fermions are vectors, and in
which the only chiral superfields are symmetry breaking Higgs fields.


title:
General Formulation for Proton Decay Rate in Minimal Supersymmetric
  SO(10) GUT

abstract:
  We make an explicit formulation for the proton decay rate in the minimal
renormalizable supersymmetric (SUSY) SO(10) model. In this model, the Higgs
fields consist of ${\bf 10}$ and ${\bf \bar{126}}$ SO(10) representations in
the Yukawa interactions with matter and of ${\bf 10}$, ${\bf \bar{126}}$, ${\bf
126}$, and ${\bf 210}$ representations in the Higgs potential. We present all
the mass matrices for the Higgs fields contained in this minimal SUSY SO(10)
model. Finally, we discuss the threshold effects of these Higgs fields on the
gauge coupling unification.


title: The branching ratio $R_{b}$ in the littlest Higgs model

abstract:
  In the context of the littlest Higgs(LH) model, we study the contributions of
the new particles to the branching ratio $R_{b}$. We find that the
contributions mainly dependent on the free parameters $f$, $c'$ and $x_{L}$.
The precision measurement value of $R_{b}$ gives severe constraints on these
free parameters.


title: Universality and tree structure of high energy QCD

abstract:
  Using non-trivial mathematical properties of a class of nonlinear evolution
equations, we obtain the universal terms in the asymptotic expansion in
rapidity of the saturation scale and of the unintegrated gluon density from the
Balitsky-Kovchegov equation. These terms are independent of the initial
conditions and of the details of the equation. The last subasymptotic terms are
new results and complete the list of all possible universal contributions.
Universality is interpreted in a general qualitative picture of high energy
scattering, in which a scattering process corresponds to a tree structure
probed by a given source.


title:
Initial state radiation corrections to double charmonium production in
  one-photon electron-positron annihilation

abstract:
  In this paper initial state radiation corrections to double production of
charmonium mesons on one-photon electron-positron annihilation at center of
mass energy $\sqrt{s}=10.6\GeV$ are studied. It is shown, that these
corrections have noticeable effect and must be taken into consideration.


title: New Tensor Particles from pi -> e nu gamma and K -> pi e nu Decays

abstract:
  The inserting of antisymmetric tensor fields into the standard electroweak
theory may explain the recent experiments on pi -> e nu gamma and K -> pi e nu
decays. New intermediate particles can induce the destructive interference in
the pion decay and the nonzero tensor and scalar form factors in the kaon
decay.


title: The scalar glueball spectrum

abstract:
  We discuss scenarios for scalar glueballs using arguments based on sum rules,
spectral decomposition, the $\frac{1}{N_c}$ approximation, the scales of the
strong interaction and the topology of the flux tubes. We analyze the
phenomenological support of those scenarios and their observational
implications. Our investigations hint a rich low lying glueball spectrum.


title: Degenerate minimal see-saw and leptogenesis

abstract:
  We analyze the most general version of the supersymmetric minimal see-saw
model with only two right-chiral neutrinos which are degenerate in masses at
the scale of Grand Unification. We study the renormalization effects that give
rise to non-zero CP asymmetries in the decays of these neutrinos and find that
their resonant enhancement due to small mass splitting is partly compensated by
other RG effects in the running of the neutrino
  Yukawa couplings. In spite of this compensation, the CP asymmetries can be
large enough for successful thermal leptogenesis. Moreover, they depend very
weakly on the right-chiral neutrino masses and the resulting leptogenesis can
be successful for very low reheating temerature, thereby allowing to overcome
the gravitino problem.


title:
Deviation of Atmospheric Mixing from Maximal and Structure in the
  Leptonic Flavor Sector

abstract:
  I attempt to quantify how far from maximal one should expect the atmospheric
mixing angle to be given a neutrino mass-matrix that leads, at zeroth order, to
a nu_3 mass-eigenstate that is 0% nu_e, 50% nu_mu, and 50% nu_tau. This is done
by assuming that the solar mass-squared difference is induced by an
"anarchical" first order perturbation, an approach than can naturally lead to
experimentally allowed values for all oscillation parameters. In particular,
both |cos 2theta_atm| (the measure for the deviation of atmospheric mixing from
maximal) and |U_e3| are of order sqrt(Delta m^2_sol/Delta m^2_atm) in the case
of a normal neutrino mass-hierarchy, or of order Delta m^2_sol/Delta m^2_atm in
the case of an inverted one. Hence, if any of the textures analyzed here has
anything to do with reality, next-generation neutrino experiments can see a
nonzero cos 2theta_atm in the case of a normal mass-hierarchy, while in the
case of an inverted mass-hierarchy only neutrino factories should be able to
see a deviation of sin^2 2theta_atm from 1.


title:
Neutrino Geophysics at Baksan I: Possible Detection of Georeactor
  Antineutrinos

abstract:
  J.M. Herndon in 90-s proposed a natural nuclear fission georeactor at the
center of the Earth with a power output of 3-10 TW as an energy source to
sustain the Earth magnetic field. R.S. Raghavan in 2002 y. pointed out that
under certain condition antineutrinos generated in georeactor can be detected
using massive scintillation detectors. We consider the underground Baksan
Neutrino Observatory (4800 m.w.e.) as a possible site for developments in
Geoneutrino physics. Here the intrinsic background level of less than one
event/year in a liquid scintillation ~1000 target ton detector can be achieved
and the main source of background is the antineutrino flux from power reactors.
We find that this flux is ~10 times lower than at KamLAND detector site and two
times lower than at Gran Sasso laboratory and thus at Baksan the georeactor
hypothesis can be conclusively tested. We also discuss possible search for
composition of georector burning nuclear fuel by analysis of the antineutrino
energy spectrum.


title:
Two Graviton Production at $e^+e^-$ and Hadron Hadron Colliders in the
  Randall-Sundrum Model

abstract:
  We compute the pair production cross section of two Kaluza Klein modes in the
Randall-Sundrum model at $e^+e^-$ and hadron hadron colliders. These processes
are interesting because they get dominant contribution from the graviton
interaction at next to leading order. Hence they provide a nontrivial test of
the low scale gravity models. All the Feynman rules at next to leading order
are also presented. These rules may be useful for many phenomenological
applications including the computation of higher order loop corrections.


title: Description of pp-interactions with very higf multiplicity at 70 GeV/c

abstract:
  The collective behavior of secondary particles in pp - interactions at 70
GeV/c is studied. A Two Stage Gluon Model is offered to describe proceses with
very high multiplicity. An active role of gluons is shown in multiparticle
dynamics. The analysis of multiplicity distributions has revealed a possibility
of a thermodynamic interpretation of these interactions. A mechanism of the
soft photon production as a signature of the quark-gluon system is proposed.


title:
Quark-antiquark composite systems:the Bethe--Salpeter equation in the
  spectral-integration technique in the case of the different quark masses

abstract:
  The Bethe--Salpeter equations for the quark-antiquark composite systems with
different quark masses, such as $q\bar s$ (with $q=u$,$d$), $q\bar Q$ and $s
\bar Q$ (with $Q=c$,$b$), are written in terms of spectral integrals. For the
mesons characterized by the mass $M$, spin $J$ and radial quantum number $n$,
the equations are presented for the $(n,M^2)$-trajectories with fixed $J$. In
the spectral-integral technique one can use the energy-dependent forces and get
beyond instantaneous approximation. The mixing between states with different
quark spin $S$ and angular momentum $L$ are also discussed.


title: Condensation of gauge interacting mass-less fermions

abstract:
  A single mass-less fermionic field with an abelian U(1) gauge interaction
(electrodynamics of a mass-less Dirac fermion) is studied by a variational
method. Even without the insertion of any extra interaction the vacuum is shown
to be unstable towards a particle-antiparticle condensate. The single particle
excitations do acquire a mass and behave as massive Fermi particles. An
explicit low-energy gap equation has been derived and numerically solved. Some
consequences of condensation and mass generation are discussed in the framework
of the standard model.


title: Bc photoproduction at HERA collider

abstract:
  The B_c photoproduction at HERA has been considered in the frame work of the
pQCD. The estimated value of the total production cross section of Bc+, Bc*+,
Bc- and Bc*- mesons is about 5 pb. Higher excitations yield about 30% to the
total cross section. Thus for integrated HERA luminosity 1 fb-1 about 7000 Bc
mesons will be produced.


title:
Three-generation flavor transitions and decays of supernova relic
  neutrinos

abstract:
  If neutrinos have mass, they can also decay. Decay lifetimes of cosmological
interest can be probed, in principle, through the detection of the redshifted,
diffuse neutrino flux produced by all past supernovae--the so-called supernova
relic neutrino (SRN) flux. In this work, we solve the SRN kinetic equations in
the general case of three-generation flavor transitions followed by invisible
(nonradiative) two-body decays. We then use the general solution to calculate
observable SRN spectra in some representative decay scenarios. It is shown
that, in the presence of decay, the SRN event rate can basically span the whole
range below the current experimental upper bound--a range accessible to future
experimental projects. Radiative SRN decays are also briefly discussed.


title: NMSSM Higgs Discovery at the LHC

abstract:
  We demonstrate that Higgs discovery at the LHC is possible in the context of
the NMSSM even for those scenarios such that the only strongly produced Higgs
boson is a very SM-like CP-even scalar which decays almost entirely to a pair
of relatvely light CP-odd states. In combination with other search channels, we
are on the verge of demonstrating that detection of at least one of the NMSSM
Higgs bosons is guaranteed at the LHC for accumulated luminosity of $300 {\rm
fb}^{-1}$.


title:
The possible effects of non-universal extra dimensions on t\to c l_i^-
  l_j^+ and H^0 \to h^0 (A^0) l_i^- l_j^+ decays in the general two Higgs
  Doublet model

abstract:
  We study the effects of non-universal extra dimensions on the decay widths of
the lepton flavor violating processes, $t\to c l_i^- l_j^+ $ and $H^0 \to h^0
(A^0) l_i^- l_j^+$ in the general two Higgs doublet model. We consider that the
extra dimensions are accessible to the standard model gauge fields and the new
Higgs doublet. We observe that the lepton flavor violating $H^0 \to h^0 (\tau^+
\mu^- + \tau^- \mu^+)$ and $H^0 \to A^0 (\tau^+ \mu^- + \tau^- \mu^+)$ Higgs
decays are sensitive to the extra dimensions, especially, in the case of two
spatial ones. This result may ensure a test to determine the compactification
scale and the possible number of extra dimensions, with the accurate
experimental measurements.


title: The United Forces in the Nature of Matter

abstract:
  The united rest mass and charge of a particle correspond to the two forms of
the same regularity of the unified nature of its ultimate structure. Each of
them contains the electric, weak, strong and the gravitational contributions.
As a consequence, the force of an attraction among the two neutrinos and force
of their repulsion must be defined from the point of view of any of the
existing types of the actions. Therefore, to understand the nature of the micro
world interaction at the fundamental level, one must use the fact that each of
the four types of well known forces includes both a kind of the Newton and a
kind of the Coulomb components. The opinion has been spoken that the existence
of the gravitational parts of the united rest mass and charge would imply the
availability of such a fifth force which come forwards in the system as a
unified whole.


title:
Big bang nucleosynthesis with a varying fine structure constant and
  non-standard expansion rate

abstract:
  We calculate primordial abundances of light elements produced during big bang
nucleosynthesis when the fine structure constant and/or the cosmic expansion
rate take non-standard values. We compare them with the recent values of
observed D, He4 and Li7 abundances, which show slight inconsistency among
themselves in the standard big bang nucleosynthesis scenario. This
inconsistency is not solved by considering either a varying fine structure
constant or a non-standard expansion rate separately but solutions are found by
their simultaneous existence.


title: CP Violation from 5-dimensional QED

abstract:
  It has been shown that QED in (1+4)-dimensional space-time, with the fifth
dimension compactified on a circle, leads to CP violation (CPV). Depending on
fermionic boundary conditions, CPV may be either explicit (through the
Scherk--Schwarz mechanism), or spontaneous (via the Hosotani mechanism). The
fifth component of the gauge field acquires (at the one-loop level) a non-zero
vacuum expectation value. In the presence of two fermionic fields, this leads
to spontaneous CPV in the case of CP-symmetric boundary conditions.
Phenomenological consequences are illustrated by a calculation of the electric
dipole moment for the fermionic zero-modes.


title:
Soft, collinear and non-relativistic modes in radiative decays of very
  heavy quarkonium

abstract:
  We analyze the end-point region of the photon spectrum in semi-inclusive
radiative decays of very heavy quarkonium (m alpha_s^2 >> Lambda_QCD). We
discuss the interplay of the scales arising in the Soft-Collinear Effective
Theory, m, m(1-z)^{1/2} and m(1-z) for z close to 1, with the scales of heavy
quarkonium systems in the weak coupling regime, m, m alpha_s and m alpha_s^2.
For 1-z \sim alpha_s^2 only collinear and (ultra)soft modes are seen to be
relevant, but the recently discovered soft-collinear modes show up for 1-z <<
alpha_s^2. The S- and P-wave octet shape functions are calculated. When they
are included in the analysis of the photon spectrum of the Upsilon (1S) system,
the agreement with data in the end-point region becomes excellent. The NRQCD
matrix elements <1^3S_1| O_8(^1S_0) | 1^3S_1> and <1^3S_1| O_8(^3P_J) | 1^3S_1>
are also obtained.


title:
General Constraints on Spin Observables, Applications to Antiproton
  Proton to Antilambda Lambda and to Polarized Quark Distributions

abstract:
  We review the density matrix formalism and the positivity conditions for
general multiple spin asymmetries, taking as an example the case antiproton +
proton -> antiLambda + Lambda, in which one, two or three spins are analyzed.
Some aspects related to quantum information and entangled states are discussed.
Some positivity domains for pairs and triplets of spin parameters are
displayed, together with the experimental points. The case of inclusive
reaction is also treated, taking as an example the spin- and transverse
momentum- dependent quark distributions.


title: Suppressed $\te_{13}$ In A Democratic Approach

abstract:
  Within a democratic approach based on discrete symmetries, we show how the
charged lepton mass hierarchies and bilarge neutrino mixings can be realized.
For the third mixing angle we find $\te_{13}\sim \sq{\fr{\De m_{\rm sol}^2}{\De
m_{\rm atm}^2}}\sim 0.1-0.2$.


title: Kaon Physics: CP Violation and Hadronic Matrix Elements

abstract:
  In this Ph.D. Thesis we analyze some CP-violating observables in Kaon decays.
In Chapters 1-3 we describe the framework in which this Thesis has been
developed and establish the definitions and notation. In Chapter 4 we study
CP-violating asymmetries in the decays of charged Kaons K\to 3\pi. The
calculation of the \Delta I=3/2 contribution to $\epsilon_K'$ in the chiral
limit, is reported in Chapter 6. In Chapter 7 we perform a calculation of the
direct CP-violating parameter $\epsilon_K'$ using some of the results obtained
in the other chapters. We also develop a new approach that can be used to
systematically determine hadronic matrix elements from the calculation of a set
of Green's functions compatible with all the QCD and phenomenology constraints.
This is described in Chapter 5. The first application of this approach -the
calculation of the chiral corrections to \hat B_K- is also sketched in Chapter
5.


title: Weak decays of the B_c meson

abstract:
  Semileptonic and nonleptonic decays of the B_c meson are studied in the
framework of the relativistic quark model. The heavy quark expansion in inverse
powers of the heavy (b,c) quark mass is used to simplify calculations while the
light final quarks in the B and D mesons are treated relativistically. The
decay form factors are explicitly expressed through the overlap integrals of
the meson wave functions in the whole accessible kinematical range. The
obtained results are compared with the predictions of other approaches.


title: Hybrid Dark Sector: Locked Quintessence and Dark Matter

abstract:
  We present a unified model of dark matter and dark energy. The dark matter
field is a modulus corresponding to a flat direction of supersymmetry, which
couples, in a hybrid type potential, with the dark energy field. The latter is
a light scalar, whose direction is stabilized by non-renormalizable terms. This
quintessence field is kept `locked' on top of a false vacuum due to the
coupling with the oscillating dark matter field. It is shown that the model can
satisfy the observations when we consider low-scale gauge-mediated
supersymmetry breaking. The necessary initial conditions are naturally attained
by the action of supergravity corrections on the potential, in the period
following the end of primordial inflation.


title: Note on the Robustness of the Neutrino Mass Bounds from Cosmology

abstract:
  The recent high precision maps of cosmic microwave anisotropies combined with
measurements of the galaxy power spectrum from new large-scale redshift surveys
have allowed stringent bounds on the sum of the neutrino masses to be placed.
The past analyses, however, have implicitly assumed that the spectrum of
primordial density fluctuations is adiabatic and coherent, as predicted in the
simplest models of inflation. In this paper, we show that the limits hold even
if the assumption on the primordial power spectrum is relaxed to allow for a
contribution of nonadiabatic, incoherent fluctuations such as would be
predicted by topological defects.


title: Leptogenesis for Pedestrians

abstract:
  During the process of thermal leptogenesis temperature decreases by about one
order of magnitude while the baryon asymmetry is generated. We present an
analytical description of this process so that the dependence on the neutrino
mass parameters becomes transparent. In the case of maximal CP asymmetry all
decay and scattering rates in the plasma are determined by the mass M_1 of the
decaying heavy Majorana neutrino, the effective light neutrino mass tilde{m}_1
and the absolute mass scale bar{m} of the light neutrinos. In the mass range
suggested by neutrino oscillations, m_{sol} \simeq 8*10^{-3} eV \lesssim
\tilde{m}_1 \lesssim m_{atm} \simeq 5*10^{-2} eV, leptogenesis is dominated
just by decays and inverse decays. The effect of all other scattering processes
lies within the theoretical uncertainty of present calculations. The final
baryon asymmetry is dominantly produced at a temperature T_B which can be about
one order of magnitude below the heavy neutrino mass M_1. We also derive an
analytical expression for the upper bound on the light neutrino masses implied
by successful leptogenesis.


title: (3+2) Neutrino Scheme From A Singular Double See-Saw Mechanism

abstract:
  We obtain a 3+2 neutrino spectrum within a left-right symmetric framework by
invoking a singular double see-saw mechanism. Higgs doublets are employed to
break $SU_{R}(2)$ and three additional fermions, singlets under the left-right
symmetric gauge group, are included. The introduction of a singularity into the
singlet fermion Majorana mass matrix results in a light neutrino sector of
three neutrinos containing predominantly $\nu_{\alpha L}$, $\alpha=e,\mu,\tau$,
separated from two neutrinos containing a small $\nu_{\alpha L}$ component. The
resulting active-sterile mixing in the $5\times 5$ mixing matrix is specified
once the mass eigenvalues and the $3\times3$ submatrix corresponding to the MNS
mixing matrix are known.


title: Atmospheric and galactic tau neutrinos

abstract:
  Neutrinos with energy greater than GeV are copiously produced in the p(A,p)
interactions occurring in the earth atmosphere and in our galactic plane. A
comparison of the tau and mu neutrino flux in the presence of neutrino
oscillations from these two astrophysical sites is presented. It is pointed out
that the galactic plane tau neutrino flux dominates over the downward going
atmospheric tau neutrino flux at much lower energy value than that for the
dominance of the mu neutrino flux from these two sites. Future prospects for
possible observations of galactic tau neutrino flux are also briefly mentioned.


title: Supersymmetric Lepton Flavour Violation at the LHC and LC

abstract:
  In supersymmetric extensions of the Standard Model, the Yukawa and/or mass
terms of the heavy neutrinos can generate lepton flavour violating slepton mass
terms. These new supersymmetric sources of lepton flavour violation may both
enhance the rates of charged lepton flavour violating processes, l_a -> l_b y,
and generate distinct final states, like l_b l_a + jets + missing E_T, at
future colliders. First, we discuss the sensitivity of future e^+e^- colliders
to the SLFV independently of the lepton flavour violating mechanism. Second, we
study lepton flavour violating slepton pair production and decay at a future
e^+e^- linear collider in the context of the seesaw mechanism in mSUGRA
post-LEP benchmark scenarios. We investigate the correlations of these signals
with the corresponding lepton flavour violating rare decays l_a -> l_b y, and
show that these correlations are particularly suited for probing the origin of
lepton flavour violation.


title: Theory of Neutrino Oscillations

abstract:
  We review critically the main assumptions on which the standard theory of
neutrino oscillations is based. We show that all assumptions are realistic,
except the so-called "equal momentum assumption", which however is irrelevant.
We briefly review the covariant plane-wave derivation of neutrino oscillations
and a quantum field theoretical wave packet model of neutrino oscillations. We
show that both approaches lead to the standard expression for the oscillation
phase. The wave packet model allows also to describe the coherence of the
oscillations and the localization of the production and detection processes.


title:
Re-examination of Color-Flavor Unlocking in Strange Quark Matter --
  Continuous Phase Transition or Asymptotic Smooth Unlocking? --

abstract: This paper has been withdrawn by the author due to a crucial error.


title: Inclusive $J/\psi$ Productions at $e^+ e^-$ Colliders

abstract:
  Inclusive $J/\psi$ productions in $e^+ e^-$ annihilation is studied in the
framework of NRQCD. We first review the leading-order calculations of the cross
sections for $e^+ e^- \to J/\psi c \bar{c}$ and $e^+ e^- \to J/\psi g g$ and
find that their ratio is about 1:1.5 at $\sqrt{s}\simeq 10$\gev. This result is
in conflict with the current measurements by the Belle Collaboration, which
finds that the process $e^+e^- \to J/\psi c\bar{c}$ accounts for about 2/3 of
all the prompt $J/\psi$'s. We show that the discrepancy in the total rate as
well as in the $J/\psi$ momentum distributions can be resolved by considering a
large renormalization $K$ factor ($K\simeq 4$) for the $J/\psi c \bar {c}$
cross section and by taking into account collinear suppression in the end-point
energy region of $J/\psi g g$ production. Detailed studies of the model
predictions in terms of the density matrix are performed and various momentum
and angular distributions are presented as functions of the $K$ factors. These
distributions can be used to determine the normalizations of each subprocess
provided that the production and decay angular distributions do not alter much
by higher order corrections.


title:
Improved Schwinger-Dyson approach to pairing phenomena and QCD phase
  diagram

abstract:
  Phase structure and phase transitions in dense QCD are studied using the
Cornwall-Jackiw-Tomboulis (CJT) potential in the improved ladder approximation.
The gap function, the condensation energy and the structure of Cooper pairs are
investigated at finite temperature and density. Due to strong coupling effects
at low densities, the gap, critical temperature and their ratio deviate from
the weak coupling values. It is shown that the internal structure of Cooper
pairs are robust against the thermal effects, despite the fact that the pairs
are strongly correlated near the critical temperature. Also, the effect of the
strange quark mass, Ms on the phase diagram is examined using a simple
kinematical criterion. We discuss the behavior of the unlocking line, on which
the CFL turns into the 2SC, through the variation of Ms.


title: 2004 Review of Light Cone Field Theory

abstract:
  This article on light cone field theory reviews the basic concepts of the
Poincare group in light cone quantum mechanics and light cone field theory. It
discusses recent progress in light cone representations of the Bethe-Salpeter
equation, with application to the pion form factor, and the quark
Schwinger-Dyson equation. Applications are discussed for deeply virtual Compton
scattering, particularly for skewed parton distributions of the pion, and rare
B to lepton pair decays. Meson light cone wave functions and recent
experimental studies of light cone wave functions are discussed. This review
was motivated by the LANL Light Cone 2002 International Workshop.


title: Astrophysical Observations of Early Universe Phase Transitions

abstract:
  After a review of CMBR correlations and recent observations, a study of
possible CMBR observations of the QCD early universe phase transition is
discussed. A model for the QCD bubble walls gives the surface tension found in
lattice calculations, and a 1+1 dimensional treatment in this model for bubble
collisions shows an interior gluonic wall, a disk with the thickness of a
nucleon and horizon size radius. This could lead to a similar magnetic wall,
which would produce B-B type CMBR polarization correlations distinct from very
early universe models. The study of magnetic fields produced in bubble
collisions in MSSM models with a first order Electroweak Phase Transition is
also discussed.


title: The Fermion Sign Problem and High Density Effective Theory

abstract:
  We investigate the positivity of the Euclidean path integral measure for
low-energy modes in dense fermionic matter. We show that the sign problem
usually associated with fermions is absent if one considers only low-energy
degrees of freedom. We describe a method for simulating dense QCD on the
lattice and give a proof using rigorous inequalities that the color-flavor
locked (CFL) phase is the true vacuum of three flavor, massless QCD.


title:
Precision Calculations for Associated WH and ZH Production at Hadron
  Colliders

abstract:
  Recently the next-to-next-to-leading order QCD corrections and the
electroweak O(alpha) corrections to the Higgs-strahlung processes ppbar/pp ->
WH/ZH + X have been calculated. Both types of corrections are of the order of
5-10%. In this article the various corrections are briefly discussed and
combined into state-of-the-art predictions for the cross sections. The
theoretical uncertainties from renormalization/factorization scales and from
the parton distribution functions are discussed.


title:
Loop Quantum Gravity induced corrections to fermion dynamics in flat
  space

abstract:
  A summary of recent work related to the calculation of loop quantum gravity
induced corrections to standard particle (photons and spin 1/2 fermions)
dynamics in flat space is presented. Stringent bounds upon the parameters
characterizing the corrections in the fermionic sector, arising from already
known clock-comparison experiments, are reviewed.


title: Neutrinos and the Phenomenology of CPT Violation

abstract:
  In this talk I review briefly theoretical models and ideas on quantum gravity
approaches entailing CPT violation. Then, I discuss various phenomenological
tests of CPT violation using neutrinos, arguing in favour of their superior
sensitivity as compared to that of tests using other particles, such as neutral
mesons, or nuclear and atomic physics experiments. I stress the fact that there
is no single figure of merit for CPT violation, and that the conclusions on
phenomenological sensitivities drawn so far are highly quantum-gravity-model
dependent.


title: Status of Tri/Bi-Maximal Neutrino Mixing

abstract:
  Tri/bi-maximal mixing (TBM) is a specific lepton mixing ansatz, which
describes the trend of the current neutrino oscillation data, in particular the
recent SNO and KAMLAND results. The significant feature of TBM in this respect
is |U_e2|^2=|U_m2|^2=|U_t2|^2=1/3, and we say that the nu_2 is tri-maximally
mixed. We have generalised the TBM ansatz to a generic mixing matrix with the
nu_2 trimaximally mixed, whereby the neutrino mass matrix in the lepton flavour
basis takes the form of a general S3 group matrix (3 x 3 `magic-square'). In
exact TBM the charged-lepton mass matrix in the neutrino mass basis (where the
neutrino mass matrix is diagonal) takes the form of a general S3 class
operator. The neutrino mass matrix in the flavour basis is a particular S3
group matrix which is also an S1 C S2 C S3 group-chain class operator, whereby
the neutrino mass eigenstates are distinguished by their `mutativity' (M_i =
+/-1) and `democracy' (D_i = 0,3) which are both good quantum numbers in exact
TBM.


title: Splitting Strong and Electromagnetic Interactions in K(L4) Decays

abstract:
  We recently considered $K_{\ell 4}$ decays in the framework of chiral
perturbation theory based on the effective Lagrangian including mesons,
photons, and leptons. There, we published analytic one-loop-level expressions
for form factors $f$ and $g$ corresponding to the mixed process,
$K^0\to\pi^0\pi^-\ell^+\nu_{\ell}$. We propose here a possible splitting
between strong and electromagnetic parts allowing analytic (and numerical)
evaluation of Isospin breaking corrections. The latter are sensitive to the
infrared divergence subtraction scheme and are sizeable near the $\pi\pi$
production threshold. Our results should be used for the extraction of the
$P$-wave iso-vector $\pi\pi$ phase shift from the outgoing data of the
currently running KTeV experiment at FNAL.


title: A Mass Inequality for the $\Xi^*$ and $\Theta^+$ Pentaquarks

abstract:
  We derive an upper bound on the mass difference between the $\Xi^*$ and
$\Theta^+$ pentaquarks which are the manifestly exotic members of the $SU(3)_f$
antidecuplet. The derivation is based on simple assumptions about $SU(3)_f$
symmetry breaking and uses the standard quantum mechanical variational method.
The resulting rather robust bound is more than 20 MeV below the experimentally
reported $\Xi^*-\Theta^+$ mass difference, emphasizing the need for
confirmation of the experimental mass values and placing strong constraints on
quark models of the pentaquark structure.


title: Correspondence between QCD sum rules and constituent quark models

abstract:
  We compare two widely used approaches to the description of hadron
properties: QCD sum rules and constituent quark models. Making use of the
dispersion formulation of the quark model, we show that both approaches lead to
similar spectral representations for hadron observables with an important
difference that quark model is based on Feynman diagrams with massive quarks,
whereas QCD sum rules are based on the same Feynman diagrams for current quarks
with the additional condensate contributions for light quarks and gluons. We
give arguments for a similarity of the smearing function in sum rules and the
hadron wave function of the quark model. Analyzing the sum rule for the
leptonic decay constant of the heavy pseudoscalar meson containing a light $u$
or $s$ quark, we find that the quark condensates at the chiral
symmetry-breaking scale $\mu_\chi\simeq 1$ GeV, $<\bar u u > = - (230 \pm 15
{\rm MeV})^3$ and $<\bar s s > = - (220 \pm 15 {\rm MeV})^3$ correspond to
constituent quark masses $m_u\simeq 220$ MeV and $m_s \simeq 350$ MeV,
respectively. We also obtain the running of the quark model parameters above
the chiral scale $\mu_\chi$. The observed correspondence between constituent
quark models and QCD sum rules allows a deeper understanding of both methods
and their parameters. It also provides a QCD basis for constituent quark
models, extending their applicability above the scale of chiral symmetry
breaking.


title:
Higgs sector contributions to \Delta a_\mu and the constraints on
  two-Higgs-doublet-model with and without SUSY

abstract:
  Interesting contributions to $\Delta a_\mu$ from a two-Higgs-doublet-model is
coming from a two-loop Barr-Zee diagram for most part of the parameter space --
a fact that has been overlooked by some Higgs/SUSY experts. A definite positive
contribution has requirements that go against precision EW data and other known
constraints. For the case without SUSY, in particular, this is almost enough to
kill the two-Higgs-doublet-model (II). We will discuss the interplay of all the
constraints and their implications.


title:
Quarkonium chromo-polarizability from the decays $J/\psi(\Upsilon) \to
  \pi \pi \ell^+ \ell^-$

abstract:
  It is pointed out that the diagonal amplitude of the $E1-E1$ chromo-electric
interaction with soft gluon fields (chromo-polarizability) can be measured
directly for the $J/\psi$ and $\Upsilon$ resonances in the decays $J/\psi \to
\pi \pi \ell^+ \ell^-$ and $\Upsilon \to \pi \pi \ell^+ \ell^-$ with soft
pions. For the $J/\psi$ this amplitude is often discussed in connection with
the $J/\psi$ interaction with nuclear matter, while for the $\Upsilon$ the
chromo-polarizability enters the estimates of the non-perturbative mass shift
of the resonance relevant to precision determination of the $b$ quark mass from
the $\Upsilon$ mass.


title:
Events with Isolated Charged Leptons and Large Missing Transverse
  Momentum at HERA

abstract:
  Striking events with isolated charged leptons, large missing transverse
momentum and large transverse momentum of the hadronic final state were
observed at the electron proton collider HERA in a data sample corresponding to
a luminosity of about 130 pb-1. The H1 collaboration observed 11 events with
isolated electrons or muons and with transverse momentum above 25 GeV. Only
3.4+-0.6 events were expected from Standard Model (SM) processes. Six of these
events have a transverse momentum of greater than 40 GeV, while 1.3+-0.3 events
were expected. The ZEUS collaboration observed good agreement with the SM.
However, ZEUS found two events with a similar event topology, but tau leptons
instead of electrons or muons in the final state. Only 0.2+-0.05 events were
expected from SM processes. For various hypotheses the compatibility of the
experimental results was investigated with respect to the SM and with respect
to possible explanations beyond the SM. Prospects for the high-luminosity
HERA-II data taking period are given.


title: MSSM: source for generating perturbations

abstract:
  In this talk I describe how MSSM flat directions act as a source for
generating all matter and scale invariant adiabatic density perturbations with
a spectral index slightly depending upon the choice of a particular flat
direction.


title: Sivers Mechanism for Gluons

abstract:
  We study T-odd gauge invariantly defined T-odd unintegrated gluon densities
in QCD. The average $\perp$ momentum of the gluons in a $\perp$ polarized
nucleon can be nonzero due to the Sivers mechanism. However, we find that the
sum of the transverse momenta due to the Sivers mechanism from gluons and all
quark flavors combined vanishes, i.e. $<{\bf k_{\perp,g}}> + \sum_q < {\bf
k_{\perp,q}}> =0$.


title: Chiral Symmetry of Heavy-Light-Quark Hadrons in Hot/Dense Matter

abstract:
  The recent discoveries by the BaBar and CLEO II collaborations on the
splitting between $D_s$ and ${\tilde D}_s$ which exhibited surprises in the
structure of heavy-light-quark systems are connected -- via the Harada-Yamawaki
"vector manifestation" of hidden local symmetry -- to chiral symmetry
restoration expected to take place at some critical temperature $T_c$ in
heavy-ion collisions or at some critical density $n_c$ in the deep interior of
compact stars, the main theme of this symposium. This unexpected connection
exemplifies the diversity of astro-hadronic phenomena discussed in this
meeting.


title:
CP sensitive observables in e+e- -> neutralino_i neutralino_j and
  neutralino decay into the Z boson

abstract:
  We study CP sensitive observables in neutralino production e+e- ->
neutralino_i neutralino_j and the subsequent two-body decays of the neutralino
neutralino_i -> neutralino_n Z and of the Z boson Z -> l \bar l (q \bar q). We
identify the CP odd elements of the Z boson density matrix and propose CP
sensitive triple-product asymmetries. We calculate these observables and the
cross sections in the Minimal Supersymmetric Standard Model with complex
parameters \mu and M_1 for an e+e- linear collider with \sqrt{s}=800 GeV and
longitudinally polarized beams. We show that the asymmetries can reach 3% for Z
-> l \bar l and 18% for Z -> q \bar q and discuss the feasibility of measuring
these asymmetries.


title: A Relief to the Supersymmetric Fine Tuning Problem

abstract:
  As is well known, electroweak breaking in the MSSM requires substantial
fine-tuning. We explain why this fine tuning problem is abnormally acute, and
this allows to envisage possible solutions to this undesirable situation.
Following these ideas, we review some recent work which shows how in models
with SUSY broken at a low scale (not far from the TeV) this fine-tuning can be
dramatically reduced or even absent.


title: QCD evolution and skewedness effects in color dipole description of DVCS

abstract:
  We show the role played by QCD evolution and skewedness effects in the DVCS
cross section at large $Q^2$ within the color dipole description of the process
at photon level. The dipole cross section is given by the saturation model,
which can be improved by DGLAP evolution at high photon virtualities. We
investigate both possibilities as well as the off-forward effect through a
simple phenomenological parametrisation. The results are compared to the recent
ZEUS DVCS data.


title: The Unintegrated Gluon Density in the Photon and Heavy Quark Production

abstract:
  The production cross section of heavy quarks in real and virtual
photon-photon collisions has been studied. The unintegrated gluon density in
the photon was obtained using the full CCFM evolution equation for the first
time. The gluon density was implemented in the Monte Carlo generator CASCADE,
and cross sections for heavy quark production in $e^+e^-$ collisions were
calculated and compared to LEP data. Also, predictions for heavy quark cross
sections in $e^+e^-$ and $\gamma\gamma$ collisions at TESLA energies are given.


title:
Hadron Liquid with a Small Baryon Chemical Potential at Finite
  Temperature

abstract:
  First, within one diagram of $\Phi$ we discuss general properties of a system
of heavy fermions of one kind (including antiparticles) interacting with rather
light bosons of one kind. Fermion chemical potential is assumed to be small,
$\mu_f \lsim T$. Already for the low temperature, $T\ll {min} (T_{\rm bl.f},
m_{b})$, the fermion mass shell proves to be partially blurred due to multiple
fermion rescatterings on virtual bosons, $m_{b}$ is the boson mass, $T_{\rm
bl.f}$ $(\ll m_f)$ is the typical temperature corresponding to a complete
blurring of the gap between fermion-antifermion continua, $m_f$ is the fermion
mass. As the result, the ratio of the number of fermion-antifermion pairs to
the number provided by the ordinary Boltzmann distribution becomes larger than
unit ($R_N >1$). For $T\gsim m_{b}^* (T)$ (hot hadron liquid, blurred boson
continuum), $m_{b}^* (T)$ is the effective boson mass, the abundance of all
particles dramatically increases. The effective fermion mass $m_f^* (T)$
decreases with the temperature increase.
  For $T\gsim T_{\rm bl.f}$ fermions are essentially relativistic particles.
Due to the interaction of the boson with fermion-antifermion pairs, $m_{b}^*
(T)$ decreases leading to the possibility of the ``hot Bose condensation'' for
$T>T_{cb}$. The phase transition might be of the second order or of the first
order depending on the species under consideration.
  We estimate $R_N \sim 1.5$ for $T\sim m_{\pi}/2$; $T_{\rm bl.f}$ proves to be
near $T_{cb}$; both values are in the vicinity of the pion mass $m_{\pi}$.


title: Pion Velocity near the Chiral Phase Transition

abstract:
  We study the pion velocity near the critical temperature $T_c$ of chiral
symmetry restoration in QCD. Using the hidden local symmetry (HLS) model as the
effective field theory, where the chiral symmetry restoration is realized as
the vector manifestation (VM), we show that the pion velocity for $T \to T_c$
receives neither quantum nor (thermal) hadronic corrections at the critical
temperature even when we start from the bare theory with Lorentz symmetry
breaking. We show that this is related to a new fixed point structure
originated in the VM. Further we match at a matching scale the axial-vector
current correlator in the HLS with the one in the operator product expansion
for QCD, and present the matching condition to determine the bare pion
velocity. We find that the pion velocity is close to the speed of light, $v_\pi
(T) = 0.83 - 0.99$.


title: Remark on the effective range approach to the f_0-a_0 mesons

abstract:
  Discussion of apparently simple issues related to the resonance close to
threshold may lead to misleading results. We clarify some subtle points, in
particular the relation between Breit-Wigner and effective range approaches to
the f_0-a_0 mesons.


title: Probing CP Violation with the Deuteron Electric Dipole Moment

abstract:
  We present an analysis of the electric dipole moment (EDM) of the deuteron as
induced by CP-violating operators of dimension 4, 5 and 6 including theta QCD,
the EDMs and color EDMs of quarks, four-quark interactions and the Weinberg
operator. We demonstrate that the precision goal of the EDM Collaboration's
proposal to search for the deuteron EDM, (1-3)\times 10^{-27} e cm, will
provide an improvement in sensitivity to these sources of one-two orders of
magnitude relative to the existing bounds. We consider in detail the level to
which CP-odd phases can be probed within the MSSM.


title: 1/N Expansion for Exotic Baryons

abstract:
  The 1/N expansion for exotic baryons is developed, and applied to the masses,
meson couplings and decay widths. Masses and widths of the 27 and 35 pentaquark
states in the same tower as the Theta+ are related by spin-flavor symmetry. The
27 and 35 states can decay within the pentaquark tower, as well as to normal
baryons, and so have larger decay widths than the lightest pentaquark Theta.
The 1/N expansion also is applied to baryon exotics containing a single heavy
antiquark. The decay widths of heavy pentaquarks via pion emission, and to
normal baryons plus heavy D^(*),B^(*) mesons are studied, and relations
following from large-N spin-flavor symmetry and from heavy quark symmetry are
derived.


title: Neutrino Masses and Oscillations: Triumphs and Challenges

abstract:
  The recent progress in establishing the existence of finite neutrino masses
and mixing between generations of neutrinos has been remarkable, if not
astounding. The combined results from studies of atmospheric neutrinos, solar
neutrinos, and reactor antineutrinos paint an intriguing picture for theorists
and provide clear motivation for future experimental studies. In this review,
we summarize the status of experimental and theoretical work in this field and
explore the future opportunities that emerge in light of recent discoveries.


title: Double Suppression of FCNCs in Supersymmetric Models

abstract:
  A mechanism for double suppression of flavor-changing neutral currents
(FCNCs) and CP violating phases in supersymmetric models is suggested. At
M_{SUSY} they are suppressed due to a nonabelian discrete flavor symmetry, and
the infrared attractive force of gauge interactions in extra dimensions are
used to suppress them at the compactification scale. We present a concrete
model, which is a simple extension of S_{3} invariant minimal supersymmetric
standard model, where only SU(2)_{L} and SU(3)_{C} gauge multiplets are assumed
to propagate in the bulk. We find that a disorder of two orders of magnitude in
soft supersymmetry breaking parameters above the compactification scale may be
allowed to satisfy experimental constraints on FCNC processes and CP violating
phenomena.


title:
The exotic baryon mass spectrum and the decuplet-octet and
  antidecuplet-octet mass difference in the Skyrme model

abstract:
  The octet, decuplet and antidecuplet baryon mass spectrum as a function of
the Skyrme charge e and the SU(3)_f symmetry breaking parameters is given in
tabular form. We also estimate the decuplet-octet and the antidecuplet-octet
mass difference. Comparison with existing literature is given.


title: Supersymmetric virtual effects in heavy quark pair production at LHC

abstract:
  We consider the production of heavy ($b,t$) quark pairs at proton colliders
in the theoretical framework of the MSSM. Under the assumption of a
"moderately" light SUSY scenario, we first compute the leading logarithmic MSSM
contributions at one loop for the elementary processes of production from a
quark and from a gluon pair in the 1 TeV c.m. energy region. We show that in
the initial gluon pair case (dominant in the chosen situation at LHC energies)
the electroweak and the strong SUSY contributions concur to produce an enhanced
effect whose relative value in the cross sections could reach the twenty
percent size for large $\tan\beta$ values in the realistic proton-proton LHC
process.


title: Superstring Phenomenology in Light of LEP, KamLAND and WMAP

abstract:
  The experimental data of the past decade suggests that the quantum gravity
vacuum should possess two key ingredients. The existence of three generations
and their embedding in SO(10) representations. The Z2XZ2 orbifold of the
heterotic string provides examples of vacua that accommodate these properties.
The utilization of string dualities to explore these models is discussed.
Classification of the Z2XZ2 orbifold with geometric shifts on complex manifolds
demonstrates that three generations are not obtained solely with symmetric
shifts on complex tori, but necessarily utilize an asymmetric shift or a
nonperturbative breaking of the GUT gauge group. The issue of mass and mixing
spectrum in the neutrino versus the quark sector is discussed.


title: Hadronic cross section from radiative return

abstract:
  The impact of final-state radiation (FSR) on the radiative return method for
the extraction of the e+e- hadronic cross section is discussed in detail and
experimental tests of the model dependence of FSR are proposed for the pi+pi-
hadronic final state.


title: TASI Lectures on Precision Electroweak Physics

abstract:
  These notes are a written version of a set of lectures given at TASI-02 on
the topic of precision electroweak physics.


title: Effective Theory of Superfluid Quark Matter

abstract:
  We provide a brief introduction to the high density effective theory of QCD.
As an application, we consider the instanton correction to the perturbatively
generated gap in the color superconducting phase. We show that the instanton
correction becomes large for mu = 1.25 GeV in N_f=2 QCD, and for mu = 750 MeV
in N_f=3 QCD with a massive strange quark. We also study some other numerical
issues related to the magnitude of the gap. We find, in particular, that a
renormalization group improved gap equation does not give results that are
substantially different from a gap equation with a fixed coupling.


title: Massive Particle Decay and Cold Dark Matter Abundance

abstract:
  The decoupling of a cold relic, during a decaying-particle-dominated
cosmological evolution is analyzed, the relic density is calculated both
numerically and semi-analytically and the results are compared with each other.
Using plausible values (from the point of view of supersymmetric models) for
the mass and the thermal averaged cross section times the velocity of the cold
relic, we investigate scenaria of equilibrium or non-equilibrium production. In
both cases, acceptable results for the dark matter abundance can be obtained,
by constraining the reheat temperature of the decaying particle, its mass and
the averaged number of the produced cold relic. The required reheat temperature
is in any case lower than about $20 {\rm GeV}$.


title:
Testing Non commutative QED gamma-gamma-gamma and
  gamma-gamma-gamma-gamma Couplings at LHC

abstract:
  In this work, we investigate the sensitivity of the process p + p --> q + q
--> j + j + gamma + gamma at LHC for the photonic 3- and 4- point functions
that appear in non commutative QED. We show that this process serves to study
the behavior of the space-space as well as of the space-time non commutativity.
We also show that this process can probe the non commutative scale in the range
of few TeV.


title: Neutrino Mass-An Overview

abstract: This talk is a brief overview of the present status of neutrino mass physics.


title: Electroweak Constraints on Little Higgs Models

abstract:
  In this talk I will give a brief introduction to Little Higgs models in
general, including an overview of all models in existence thus far. I then
review some of the generic constraints on these models from electroweak
precision measurements.


title: Exploring Little Higgs Models with ATLAS at the LHC

abstract:
  We discuss possible searches for the new particles predicted by Little Higgs
Models at the LHC. By using a simulation of the ATLAS detector, we demonstrate
how the predicted quark, gauge bosons and additional Higgs bosons can be found
and estimate the mass range over which their properties can be constrained.


title: SU(3) breaking in decays of exotic baryons

abstract:
  Within the chiral soliton model the SU(3) breaking collective hamiltonian
introduces representation mixing in the baryonic wave functions. We calculate
${\cal{O}}(m_s)$ effects of this mixing on the decay widths of decuplet and
antidecuplet baryons. We find importance of the 27-plet admixture in the
$\Theta^+$ and $\Xi_{\bar{10}}$ decays. The role of the $1/N_c$ nonleading
terms in ${\cal{O}}(m_s)$ transition matrix elements is discussed.


title:
Geoantineutrino Spectrum and Slow Nuclear Burning on the Boundary of the
  Liquid and Solid Phases of the Earth's core

abstract:
  The problem of the geoantineutrino deficit and the experimental results of
the interaction of uranium dioxide and carbide with iron-nickel and
silica-alumina melts at high pressure (5-10 GPa) and temperature (1600- 22000
C) have induced us to consider the possible consequences of made by V.
Anisichkin and A. Ershov supposition that there is an actinoid shell on
boundary of liquid and solid phases of the Earth's core. We have shown that the
activation of a natural nuclear reactor operating as the solitary waves of
nuclear burning in 238U- and/or 232Th-medium (in particular, the
neutron-fission progressive wave of Feoktistov and/or Teller-Ishikawa-Wood)
such physical consequent can be. The simplified model of the kinetics of
accumulation and burnup in U-Pu fuel cycle of Feoktistov is developed. The
results of the numerical simulation of neutron-fission wave in two-phase UO2/Fe
medium on a surface of the Earth's solid core are presented. On the basis of
O'Nions-Ivensen-Hamilton model of the geochemical evolution of mantle
differentiation and the Earth's crust growth supplied by actinoid shell on the
boundary of liquid and solid phases of the Earth's core as a nuclear energy
source, the tentative estimation of intensity and geoantineutrino spectrum on
the Earth surface was obtained.


title:
The twist-3 distribution amplitudes in the $B\to\pi$ transition form
  factor

abstract:
  We derive an expression for the $B\to\pi$ transition form factor only
depending the twist-3 distribution amplitudes by choosing an adequate chiral
current correlator in the light-cone QCD sum rules. Our result show that the
contribution from the twist-3 distribution amplitudes to the $f_{B\pi}^+(q^2)$
give a constraint on the twist-3 light-cone distribution amplitude.


title: Infrared Behavior of High-Temperature QCD

abstract:
  The damping rate \gamma_t(p) of on-shell transverse gluons with ultrasoft
momentum p is calculated in the context of next-to-leading-order
hard-thermal-loop-summed perturbation of high-temperature QCD. It is obtained
in an expansion to second order in p. The first coefficient is recovered but
that of order p^2 is found divergent in the infrared. Divergences from
light-like momenta do also occur but are circumvented. Our result and method
are critically discussed, particularly regarding a Ward identity obtained in
the literature. When enforcing the equality between \gamma_t(0) and
\gamma_l(0), a rough estimate of the magnetic mass is obtained. Carrying a
similar calculation in the context of scalar quantum electrodynamics shows that
the early ultrasoft-momentum expansion we make has little to do with the
infrared sensitivity of the result.


title: Electromagnetic Form Factors and the hCQM

abstract:
  We briefly report on results about the electromagnetic form factors of the
nucleon obtained with different models and then we concentrate our attention on
recent results obtained with the hypercentral constituent quark model (hCQM).


title: Self-tuning of cosmological constant and exit from inflation

abstract:
  I review the recent 5D self-tuning solutions of the cosmological constant
problem, and try to unify two cosmological constant problems within the
framework of the self-tuning solutions. One problem, the large cosmological
constant needed for inflation, is interpreted by starting with the parameters
allowing only the dS vacuum, and the vanishing cosmological constant at a true
vacuum is realized by changing parameters by exit from inflation at the brane
such that the self-tuning solution is allowed.


title: Dynamical study of the pentaquark antidecuplet

abstract:
  Dynamical calculations are performed for all isomultiplets of the flavour
antidecuplet to which the newly discovered pentaquark $\Theta^+$ belongs. The
framework is a constituent quark model where the short-range interaction has a
flavour-spin structure. In this model the lowest pentaquarks have positive
parity. Each antidecuplet member is described by a variational solution with
the Pauli principle properly taken into account. By fitting the mass of
$\Theta^+$ of minimal content $uudd\bar{s}$, the mass of $\Xi^{--}$, of minimal
content $ddss \bar{u}$, is predicted at approximately 1960 MeV. The influence
of the octet-antidecuplet mixing on the masses of the $Y = 1$ and 0 pentaquarks
is considered within the same model and the role of the kinetic energy plus the
hyperfine interaction in this mixing is pointed out.


title: R-parity Violation and General Soft Supersymmetry Breaking

abstract:
  We consider the most general class possible of soft supersymmetry breaking
terms that can be added to the MSSM, with and without R-parity violation,
consistent with the sole requirement that no quadratic divergences are induced.
We renormalise the resulting theory through one loop and give an example of how
a previously ignored term might affect the sparticle spectrum.


title:
Suppressing the Background Process to QED Compton Scattering for
  Delineating the Photon Content of the Proton

abstract:
  We investigate the QED Compton process (QEDCS) in $e p \to e \gamma p$ and $e
p \to e \gamma X$, together with the major background coming from the virtual
Compton scattering (VCS), where the photon is emitted from the hadronic vertex.
We suggest new kinematical constraints which suppress the VCS background and
are furthermore suitable for the extraction of the equivalent photon content of
the proton at the HERA collider. We show that the cross section, commonly
expressed in terms of the proton structure functions, is reasonably well
described by the equivalent photon approximation of the proton, also in the
inelastic channel in the proposed kinematical region.


title: A Stueckelberg Extension of the Standard Model

abstract:
  An extension of the standard model of electro-weak interactions by an extra
abelian gauge boson is given, in which the extra gauge boson and the
hypercharge gauge boson both couple to an axionic scalar in a form that leads
to a Stueckelberg mass term. The theory leads to a massive Z$'$ whose couplings
to fermions are uniquely determined and suppressed by small mixing angles. Such
a Z$'$ could have low mass and appear in $e^+e^-$ collisions as a sharp
resonance. The branching ratios into $f\bar f$ species, and the
forward-backward asymmetry are found to have distinctive features. The model
also predicts a new unit of electric charge $e'=Q'e$, where $Q'$ is in general
irrational, in the coupling of the photon with hidden matter that is neutral
under $SU(2)_L\times U(1)_Y$.


title: Big Bang Nucleosynthesis Constraints on Z' Properties

abstract:
  In models involving new TeV-scale Z' gauge bosons, the new U(1)' symmetry
often prevents the generation of Majorana masses needed for a conventional
neutrino seesaw, leading to three super-weakly interacting right-handed
neutrinos, the Dirac partners of the ordinary neutrinos. These can be produced
prior to Big Bang Nucleosynthesis (BBN) by the Z' interactions, leading to a
faster expansion rate and too much ^4He. We quantify the constraints on the Z'
properties from nucleosynthesis for Z' couplings motivated by a class of E6
models parametrized by an angle theta_E6. The decoupling temperature, which is
higher than that of ordinary left-handed neutrinos due to the large Z' mass, is
calculated, and the equivalent number of extra weakly interacting neutrinos,
Delta N_nu, is obtained numerically as a function of the Z' mass, couplings,
and the Z-Z' mixing angle. The ^4He abundance from BBN gives the most stringent
limit on M_Z' unless Z' coupling to the right-handed neutrinos are small.


title: Current cosmological bounds on neutrino masses and relativistic relics

abstract:
  We combine the most recent observations of large-scale structure (2dF and
SDSS galaxy surveys) and cosmic microwave anisotropies (WMAP and ACBAR) to put
constraints on flat cosmological models where the number of massive neutrinos
and of massless relativistic relics are both left arbitrary. We discuss the
impact of each dataset and of various priors on our bounds. For the standard
case of three thermalized neutrinos, we find an upper bound on the total
neutrino mass sum m_nu < 1.0 (resp. 0.6) eV (at 2sigma), using only CMB and LSS
data (resp. including priors from supernovae data and the HST Key Project), a
bound that is quite insensitive to the splitting of the total mass between the
three species. When the total number of neutrinos or relativistic relics N_eff
is left free, the upper bound on sum m_nu (at 2sigma, including all priors)
ranges from 1.0 to 1.5 eV depending on the mass splitting. We provide an
explanation of the parameter degeneracy that allows larger values of the masses
when N_eff increases. Finally, we show that the limit on the total neutrino
mass is not significantly modified in the presence of primordial gravitational
waves, because current data provide a clear distinction between the
corresponding effects.


title: Role of Strange Quark Mass in Pairing Phenomena in QCD

abstract:
  We study the dynamical effect of strange quark mass as well as kinematical
one on the color-flavor unlocking transition using a NJL model. Paying a
special attention to the multiplicity of gap parameters, we derive an exact
formula of the effective potential for 5-gap parameters. Based on this, we
discuss that the unlocking transition might be of second order rather than of
first order as is predicted by a simple kinematical criterion for the
unlocking.


title: Topological Structure of Dense Hadronic Matter

abstract:
  We present a summary of work done on dense hadronic matter, based on the
Skyrme model, which provides a unified approach to high density, valid in the
large $N_c$ limit. In our picture, dense hadronic matter is described by the
{\em classical} soliton configuration with minimum energy for the given baryon
number density. By incorporating the meson fluctuations on such ground state we
obtain an effective Lagrangian for meson dynamics in a dense medium. Our
starting point has been the Skyrme model defined in terms of pions, thereafter
we have extended and improved the model by incorporating other degrees of
freedom such as dilaton, kaons and vector mesons.


title:
Stabilizing the axion and a natural solution to the mu problem of
  supersymmetry

abstract:
  The axion solution to the strong CP problem makes use of a global
Peccei-Quinn (PQ) U(1) symmetry which is susceptible to violations from quantum
gravitational effects. We show explicitly how discrete gauge symmetries can
protect the axion from such violations. PQ symmetry emerges as an accidental
global symmetry from discrete gauge symmetries which are subgroups of the
anomalous U(1) of string origin. We also show how the
Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) axion model provides a natural
solution to mu problem of supersymmetry as mu ~ M_{SUSY} ~ M^2_{PQ}/M_{Pl}.


title: Single Charged MSSM Higgs-boson production at a Linear Collider

abstract:
  In the Minimal Supersymmetric Standard Model we present the calculation of
the single charged Higgs-boson production in the gamma W- or Z W-fusion and the
charged Higgs strahlung channel, e^+ e^- -> e nu H^\pm. The set of all O(alpha)
corrections arising from loops of Standard Model fermions and scalar fermions
are taken into account. Contrary to the case of single neutral heavy CP-even
Higgs-boson production, for the charged Higgs boson we find for all the
parameter space of the typical benchmark scenarios a cross section smaller than
\sim 0.01 fb for sqrt(s)/2 \lessim M_H^\pm.


title: Model-independent view on the low-mass proton-antiproton enhancement

abstract:
  We present a simple interpretation of the recently observed near-threshold
proton-antiproton enhancement. It is described by a set of low-energy
parameters deduced from the analysis of NantiN experiments at LEAR. We predict
a related effect in photoproduction reaction under study by CLAS collaboration.


title: Using untagged B^0 -> D K_S to determine gamma

abstract:
  It is shown that the weak phase gamma=arg(-V_{ud}V^*_{ub}V_{cb}V_{cd}^*) can
be determined using only untagged decays B/Bbar--> D K_S. In order to reduce
the uncertainty in gamma, we suggest combining information from B^{+-}-->
DK^{+-} and from untagged B^0 decays, where the D meson is observed in common
decay modes. Theoretical assumptions, which may further reduce the statistical
error, are also discussed.


title: Phenomenological constraints on the Jaffe-Wilczek model of pentaquarks

abstract:
  A model recently introduced by Jaffe and Wilczek based on the quarks being
dynamically bound into diquarks has been used to predict that the recently
observed exotic baryons (pentaquarks) fall into a nearly ideally mixed
combination of an octer and anti-decuplet representations of SU(3) flavor. The
model predicts two states with nucleon quantum numbers which have tentatively
been identified with the N*(1440) and the N*(1710). This paper examines the
viability of this model by focusing on the decay width of the nucleon members
of the multiplet. An inequality relating the partial widths of these nucleon
states in the N+nucleon channel to the width of the theta+ is derived for this
model under the assuming ideal mixing and that the only significant exact SU(3)
symmetry violations are the result of ideal mixing, threshold effects and the
masses of pseudo-Goldstone bosons. This inequality is badly violated if the
states in the multiplet are the N*(1440) and the N*(1710) and if the recent
bounds extracted for the theta+ width are reliable. Thus, the model appears to
require a scenario with the existence of at least one presently unknown
resonance with nucleon quantum numbers.


title:
Charged Higgs bosons in the transition region ${M_{H^\pm} \sim m_t}$ at
  the LHC

abstract:
  We illustrate preliminary results obtained through Monte Carlo (HERWIG) and
detector (ATLFAST) simulations of the $H^\pm\to\tau^\pm\nu_\tau$ signature of
charged Higgs bosons with masses comparable to that of the top quark.


title: Production of Neutral Higgs + Jet at the LHC in the SM and the MSSM

abstract:
  The cross section prediction for the production of the lightest neutral Higgs
boson in association with a high-p_T hadronic jet is presented in the framework
of the minimal supersymmetric standard model (MSSM) and compared to the SM
case. Prospects for the CERN Large Hadron Collider (LHC) are discussed.


title: Curvaton and QCD Axion in Supersymmetric Theories

abstract:
  A pseudo Nambu-Goldstone boson as curvaton avoids the eta-problem of
inflation which plagues most curvaton candidates. We point out that a concrete
realization of the curvaton mechanism with a pseudo Nambu-Goldstone boson can
be found in the supersymmetric Peccei-Quinn mechanism resolving the strong CP
problem. In the flaton models of Peccei-Quinn symmetry breaking, the angular
degree of freedom associated with the QCD axion can naturally be a flat
direction during inflation and provides successful curvature perturbations. In
this scheme, the preferred values of the axion scale and the Hubble parameter
during inflation turn out to be about 10^{10} GeV and 10^{12} GeV,
respectively. Moreover, it is found that a significant isocurvature component,
(anti)correlated to the overall curvature perturbation, can be generated, which
is a smoking-gun for the curvaton scenario. Finally, non-Gaussianity in the
perturbation spectrum at potentially observable level is also possible.


title:
Production of Theta+ in gamma + D -> Lambda + Theta+ and gamma + D ->
  Sigma + Theta+ reactions

abstract:
  The gamma + D -> Lambda + Theta+ and gamma + D -> Sigma + Theta+ reactions
can be used to determine the width of Theta+ almost model-independently. We
calculate the differential cross sections of the gamma +D -> Lambda + Theta+,
gamma + D -> Sigma + Theta+ and relevant background reactions in the photon
energy range 1.2 < E_{\gamma} < 2.6 GeV. We determine the most favorable
kinematic conditions and observables for the experimental studies of Theta+ in
the considered processes. We argue that a comparison of the gamma + D -> Lambda
+ Theta+ and gamma + D -> Sigma + Theta+ cross sections should unambiguously
determine isospin of Theta+.


title:
Mass constraints, production cross sections, and decay rates in the Two
  Higgs Doublet Model of type II

abstract:
  We calculate masses, production cross sections, and decay rates in the Two
Higgs Doublet Model of type II. We also discuss running coupling constants and
Grand Unification.


title: The Invisible Higgs Decay Width in the Add Model at the LHC

abstract:
  Assuming flat universal extra dimensions, we demonstrate that for a light
Higgs boson the process $pp\to W^*W^* +X \to Higgs,graviscalars +X \to
invisible+X$ will be observable at the $5 \sigma$ level at the LHC for the
portion of the Higgs-graviscalar mixing ($\xi$) and effective Planck mass
($M_D$) parameter space where channels relying on visible Higgs decays fail to
achieve a $5 \sigma$ signal. Further, we show that even for very modest values
of $\xi$ the invisible decay signal probes to higher $M_D$ than does the
($\xi$-independent) jets/$\gam$ + missing energy signal from graviton
radiation. We also discuss various effects, such as Higgs decay to two
graviscalars, that could become important when $m_h/M_D$ is of order 1.


title: Hyperon Beta Decay and the CKM Matrix

abstract:
  I shall present a pedagogical discussion of hyperon semileptonic decays,
covering some of the historical background, the basics notions of hyperon
semileptonic decays, deeply inelastic scattering and the CKM matrix, and the
description of SU(2) and SU(3) breaking. I shall also present a prediction for
a process under current experimental study.


title: An NMSSM Without Domain Walls

abstract:
  We consider the Higgs sector in an extension of the MSSM involving an extra
U(1)' gauge symmetry and SM singlet U(1)' charged scalars, in which the
effective $\mu$ parameter is decoupled from the Z' mass. There are large
mixings between Higgs doublets and singlets, significantly affecting the Higgs
spectrum, production cross sections, decay modes, exclusion limits, and allowed
parameters ranges. Scalars considerably lighter than 114 GeV are allowed, and
the range $\tan \beta \sim 1$ is both allowed and theoretically favored. We
concentrate on the lighter (least model dependent) Higgs particles with
significant SU(2)-doublet components to their wave functions, for the case of
no explicit CP violation in the Higgs sector. We consider their spectra,
including the dominant radiative corrections to their masses in the large
$\tilde t$ mass limit; production cross sections and exclusion limits at LEP
and a future linear collider; and decay properties.


title: The Status of Inelastic Dark Matter

abstract:
  In light of recent positive results from the DAMA experiment, as well as new
null results from CDMS Soudan, Edelweiss, ZEPLIN-I and CRESST, we reexamine the
framework of inelastic dark matter with a standard halo. In this framework,
which was originally introduced to reconcile tensions between CDMS and DAMA,
dark matter particles can scatter off of nuclei only by making a transition to
a nearly degenerate state that is roughly $100 \kev$ heavier. We find that
recent data significantly constrains the parameter space of the framework, but
that there are still regions consistent with all experimental results. Due to
the enhanced annual modulation and dramatically different energy dependence in
this scenario, we emphasize the need for greater information on the dates of
data taking, and on the energy distribution of signal and background. We also
study the specific case of ``mixed sneutrino'' dark matter, and isolate regions
of parameter space which are cosmologically interesting for that particular
model. A significant improvement in limits by heavy target experiments such as
ZEPLIN or CRESST should be able to confirm or exclude the inelastic dark matter
scenario in the near future. Within the mixed sneutrino model, an elastic
scattering signature should be seen at upcoming germanium experiments,
including future results from CDMS Soudan.


title:
Do neutrino flavor oscillations forbid large lepton asymmetry of the
  universe ?

abstract:
  It is shown that hypothetical neutrino-majoron coupling can suppress neutrino
flavor oscillations in the early universe, in contrast to the usual weak
interaction case. This reopens a window for a noticeable cosmological lepton
asymmetry which is forbidden for the large mixing angle solution in the case of
standard interactions of neutrinos.


title: Pair Production of Arbitrary Spin Particles by Electromagnetic Fields

abstract:
  The exact solutions of the wave equation for arbitrary spin particles in the
field of the soliton-like electric impulse were obtained. The differential
probability of pair production of particles by electromagnetic fields has been
evaluated on the basis of the exact solutions. As a particular case, the
particle pair producing in the constant and uniform electric field were
studied.


title: The Instanton Molecule Liquid and "Sticky Molasses" Above T_c

abstract:
  The main objective of this work is to explore the evolution in the structure
of the quark-antiquark bound states in going down in the chirally restored
phase from the so-called "zero binding points" T_zb to the QCD critical
temperature T_c at which the Nambu-Goldstone and Wigner-Weyl modes meet. In
doing this, we adopt the idea recently introduced by Shuryak and Zahed for
charmed $\bar c c$, light-quark $\bar q q$ mesons $\pi, \sigma, \rho, A_1$ and
gluons that at T_zb, the quark-antiquark scattering length goes through
infinity at which conformal invariance is restored, thereby transforming the
matter into a near perfect fluid behaving hydrodynamically, as found at RHIC.
We show that the binding of these states is accomplished by the combination of
(i) the color Coulomb interaction, (ii) the relativistic effects, and (iii) the
interaction induced by the instanton-anti-instanton molecules. The spin-spin
forces turned out to be small. While near T_zb all mesons are large-size
nonrelativistic objects bound by Coulomb attraction, near T_c they get much
more tightly bound, with many-body collective interactions becoming important
and making the $\sigma$ and $\pi$ masses approach zero (in the chiral limit).
The wave function at the origin grows strongly with binding, and the near-local
four-Fermi interactions induced by the instanton molecules play an increasingly
more important role as the temperature moves downward toward T_c.


title:
Critical Behavior of Damping Rate for Plasmon with Finite Momentum in
  \phi^4 Theory

abstract:
  Applying thermal renormalization group (TRG) equations to $\phi^4$ theory
with spontaneous breaking symmetry, we investigate the critical behavior of the
damping rate for the plasmons with finite momentum at the symmetry-restoring
phase transition. From the TRG equation the IR cutoff provided by the external
momentum leads to that the momentum-dependent coupling constant stops running
in the critical region. As the result, the critical slowing down phenomenon
reflecting the inherently IR effect doesn't take place at the critical point
for the plasmon with finite external momentum.


title:
On inconsistency of experimental data on primary nuclei spectra with sea
  level muon intensity measurements

abstract:
  For the first time a complete set of the most recent direct data on primary
cosmic ray spectra is used as input into calculations of muon flux at sea level
in wide energy range $E_\mu=1-3\cdot10^5$ GeV. Computations have been performed
with the CORSIKA/QGSJET and CORSIKA/VENUS codes. The comparison of the obtained
muon intensity with the data of muon experiments shows, that measurements of
primary nuclei spectra conform to sea level muon data only up to several tens
of GeV and result in essential deficit of muons at higher energies. As it
follows from our examination, uncertainties in muon flux measurements and in
the description of nuclear cascades development are not suitable to explain
this contradiction, and the only remaining factor, leading to this situation,
is underestimation of primary light nuclei fluxes. We have considered
systematic effects, that may distort the results of the primary cosmic ray
measurements with the application of the emulsion chambers. We suggest, that
re-examination of these measurements is required with the employment of
different hadronic interaction models. Also, in our point of view, it is
necessary to perform estimates of possible influence of the fact, that sizable
fraction of events, identified as protons, actually are antiprotons. Study of
these cosmic ray component begins to attract much attention, but today nothing
definite is known for the energies $>40$ GeV. In any case, to realize whether
the mentioned, or some other reasons are the sources of disagreement of the
data on primaries with the data on muons, the indicated effects should be
thoroughly analyzed.


title: Double beta decay and the extra-dimensional seesaw mechanism

abstract:
  We study the model-building conditions under which an observable 0vBB decay
signal is predicted due to Kaluza-Klein singlet neutrinos in theories with
large extra dimensions. Our analysis is based on 5-dimensional singlet-neutrino
models compactified on an S^1/Z_2 orbifold, where the Standard-Model fields are
localized on a 3-brane. We show that sizeable 0vBB rates within the above
minimal 5-dimensional framework would require a non-vanishing shift of the
3-brane from the orbifold fixed points by an amount smaller than the typical
scale 100 inverse MeV characterizing the Fermi nuclear momentum. The resulting
5-dimensional models predict a sizeable effective Majorana-neutrino mass that
could be several orders of magnitude larger than the light neutrino masses.


title:
Improved Gell-Mann--Okubo Relations and SU(3) Rotation Excitations of
  Baryon States

abstract:
  The corrections to the Gell-Mann--Okubo relations of baryon masses are
presented in the SU(3) Skyrme model. These corrections are calculated up to the
second order in flavor breaking at the skyrmion quantum mechanics. The results
are compatible with the experimental data. They could be regarded as a signal
of existence of the SU(3) rotation excitation states of baryons: 27-let (with
spin 1/2 or 3/2), 10*-let (with spin 1/2) and 35-let (with spin 3/2).


title:
Chiral Quark Model Calculation of the Momentum Dependence of Hadronic
  Current Correlation Functions at Finite Temperature

abstract:
  We calculate spectral functions associated with hadronic current correlation
functions for vector currents at finite temperature. We make use of a model
with chiral symmetry, temperature-dependent coupling constants and
temperature-dependent momentum cutoff parameters. Our model has two parameters
which are used to fix the magnitude and position of the large peak seen in the
spectral functions. In our earlier work, good fits were obtained for the
spectral functions that were extracted from lattice data by means of the
maximum entropy method (MEM). In the present work we extend our calculations
and provide values for the three-momentum dependence of the vector correlation
function at $T=1.5T_c$. These results are used to obtain the correlation
function in coordinate space, which is usually parametrized in terms of a
screening mass. Our results for the three-momentum dependence of the spectral
functions are similar to those found in a recent lattice QCD calculation for
charmonium [S. Datta, F. Karsch, P. Petreczky and I. Wetzorke,
hep-lat/0312037]. However, we do not find the expontential behavior in
coordinate space that is usually assumed for the spectral function for $T>T_c$
and which allows for the definition of a screening mass.


title: Higgs Quark Couplings in SUSY with CP and Flavor Violations

abstract:
  In minimal supersymmetric model with a light Higgs sector, explicit CP
violation and most general flavor mixings in the sfermion sector, integration
of the superpartners out of the spectrum induces potentially large
contributions to the Yukawa couplings of light quarks via those of the heavier
ones. These corrections can be sizeable even for moderate values of tan(beta),
and remain nonvanishing even if all superpartners decouple. Then Higgs boson
couplings to light quarks assume spectacular enhancements; in particular,
couplings to down and strange quarks become degenerate with that to the bottom
quark. There arise strikingly non-standard effects that can show up in both
Higgs boson searches and FCNC observables.


title: Quintessence and Varying \alpha from Shape Moduli

abstract:
  In extra-dimensional models which are compactified on an n-torus (n>1) there
exist moduli associated with the torus volume (which sets the fundamental
Planck scale), the ratios of the torus radii, and the angle(s) of periodicity.
We consider a model with gravity in the bulk of n=2 large extra dimensions with
a fixed volume, taking all Standard Model fields to be confined to a "thick"
and supersymmetric 3-brane. The Casimir energy of fields in the bulk of the
2-torus accounts for the present dark energy density while the shape moduli
begin rolling at late times (z ~ 1) and induce a shift in the Kaluza-Klein
masses of the Standard Model fields. The low energy value of the fine-structure
constant is sensitive at loop level to this shift. For reasonable cosmological
initial conditions on the shape moduli we obtain a redshift dependence of the
fine-structure constant similar to that reported by Webb et al., which is
roughly compatible with Oklo and meteorite bounds. Constraints from coincident
variation in the QCD scale are also briefly discussed.


title: Stable Heavy Pentaquark States

abstract:
  If the Theta^+(1540) is interpreted as a bound state of a $\bar s$ quark and
two (ud) diquarks in a relative P-wave, then it is very likely that there exist
pentaquark states with a heavy antiquark, $\bar b$ or $\bar c$, and two
``light'' diquarks in a relative S-wave which are stable against strong decays.
We make a mass estimate for exotic states of this type and discuss their weak
decays. Isospin relations are constructed which test their flavor quantum
numbers.


title: Searching for New Physics through LFV Processes

abstract:
  Muon lepton flavor processes are reviewed in connection with search for
physics beyond the standard model. Several methods to distinguish different
theoretical models are discussed for $\mu \to e \gamma$, $\mu \to 3 e$, and
$\mu - e$ conversion processes. New calculation of the $\mu - e$ conversion
rate is presented including a Higgs boson mediated effect in the supersymmetric
seesaw model.


title: Multiple Interactions and the Structure of Beam Remnants

abstract:
  Recent experimental data have established some of the basic features of
multiple interactions in hadron-hadron collisions. The emphasis is therefore
now shifting, to one of exploring more detailed aspects. Starting from a brief
review of the current situation, a next-generation model is developed, wherein
a detailed account is given of correlated flavour, colour, longitudinal and
transverse momentum distributions, encompassing both the partons initiating
perturbative interactions and the partons left in the beam remnants. Some of
the main features are illustrated for the Tevatron and the LHC.


title: Broken SU(3) antidecuplet for $\Theta^+$ and $\Xi_{{3/2}}$

abstract:
  If the narrow exotic baryon resonances $\Theta^+(1540)$ and
$\Xi_{{3/2}(1862)$ are members of the $J^P = {1/2}1/2^+$ antidecuplet with
$N^*(1710)$, the octet-antidecuplet mixing is required not only by the mass
spectrum but also by the decay pattern of $N^*(1710)$. This casts doubt on
validity of the $\Theta^+$ mass prediciton by the chiral soliton model. While
all pieces of the existing experimental information point to a small
octet-antidecuplet mixing, the magnitude of mixing required by the mass
spectrum is not consistent with the value needed to account for the hadronic
decay rates. The discrepancy is not resolved even after the large experimental
uncertainty is taken into consideration. We fail to find an alternative SU(3)
assignment even with different spin-parity assignment.


title: Neutral top-pion and lepton flavor violating processes

abstract:
  In the context of topcolor-assisted techicolor(TC2) models, we study the
contributions of the neutral top-pion $\pi^{0}_{t}$ to the lepton flavor
violating(LFV) processes $l_{i}\to l_{j}\gamma$ and $l_{i}\to l_{j}l_{k}l_{l}$.
We find that the present experimental bound on $\mu\to e\gamma$ gives severe
constraints on the free parameters of $TC2$ models. Taking into account these
constraints, we consider the processes $l_{i}\to l_{j}l_{k}l_{l}$ generated by
top-pion exchange at the tree-level and the one loop level, and obtain
$Br(\mu\to 3e)\simeq 2.87\times 10^{-14}$, $1.1\times 10^{-15}\leq Br(\tau\to
3e)\simeq Br(\tau\to 2e\mu)\leq 4.4 \times 10^{-15} $, $3.1\times 10^{-15} \leq
Br(\tau\to 2\mu e)\simeq Br(\tau\to 3\mu)\leq 1.5 \times 10^{-14}$ in most of
the parameter space.


title: Does the hard pomeron obey Regge factorisation?

abstract:
  While data for the proton structure function demand the presence of a
hard-pomeron contribution even at quite small Q^2, previous fits to the pp and
p\bar p total cross sections have found that in these there is little or no
room for such a contribution. We re-analyse the data and show that itmay indeed
be present and that, further, it probably obeys Regge factorisation:
sigma^{gamma p}(s,Q_1^2)sigma^{gamma p}(s,Q_2^2)= sigma^{pp}(s)sigma^{gamma
gamma}(s,Q_1^2,Q_2^2) for all values of Q_1^2 and Q_2^2.


title: Quantum algebras, particle phenomenology, and (quasi)supersymmetry

abstract:
  Quantum algebras U_q(su_n) used as the algebras of flavour symmetry (usually
described by SU(n)) to study static properties of hadrons lead to intriguing
results. In this contribution we focus on the peculiar properties manifested by
different q-deformed structures (e.g., the braided line, the quantum algebras
U_q(su_2) and U_q(su_n), n >= 3) in the special limit of q = -1. Similarities
(complete or partial) with supersymmetry that emerge in this special limit are
discussed.


title:
Effective 4D propagation of a charged scalar particle in Visser brane
  world

abstract:
  In this work we extend an analysis due to Visser of the effective propagation
of a neutral scalar particle on a brane world scenario which is a particular
solution of the five dimensional Einstein-Maxwell equations with cosmological
constant having an electric field pointing in the extra spatial dimension. We
determine the dispersion relations of a charged scalar particle to first order
in a perturbative analysis around those of the neutral particle. Since
depending on whether the particle is charged or not the dispersion relations
change, we could collect bulk information, namely the presence of the electric
field, by studying the 4D dynamics of the particles.


title: Degeneracy of the quarks, shell structure in the chiral soliton

abstract:
  We obtain multi-soliton solutions with discrete symmetries in the chiral
quark soliton model using the rational map ansatz. The solutions exhibit
degenerate bound spectra of the quark orbits depending on the background of
pion field configurations. It is shown that resultant baryon densities inherit
the same discrete symmetries as the chiral fields. Evaluating the radial
component of the baryon density, shell-like structure of the valence quark
spectra is also observed.


title:
Best Fit Predictions for Flavour Violating Processes in MSSM Constrained
  by Unification

abstract:
  We study the Minimal Supersymmetric Standard Model (MSSM) constrained by
unification assuming mSUGRA SUSY breaking. In particular this means that the
three gauge couplings are unified at a {\it per cent} level, third generation
yukawa couplings are unified at a $10 $% level, and at the unification scale
$M_U\approx 10^{16}$ the SUSY breaking masses of squarks and sleptons are
universal up to specific D-term contributions. At $M_U$ we also include
right-handed neutrinos that are decoupled at their three respective scales. In
a top-down global analysis we then find that there are two distinct best fits,
primarily distinguished by the masses of the non-Standard Model Higgs states,
and compute the predictions for flavour violating processes involving both
leptons and quarks. The fit with the light Higgs spectrum is especially
interesting with regards to the decay $B_s\to \mu^+\mu^-$. We note that the
latter results go beyond what is called minimal flavour violation in the MSSM.