title: A natural framework for bi-large neutrino mixing

abstract:
  In this talk I describe a natural framework for bi-large neutrino mixing
within the context of two models -- 1) a simple generalization of the MSSM and
2) an SO(10) model. Our starting point is the Frampton, Glashow, Yanagida [FGY]
neutrino mass ansatz which can easily accomodate bi-large neutrino mixing. The
main point of FGY, however, is to obtain a theory of neutrino masses with only
one possible CP violating angle. They argue that the sign of the baryon
asymmetry of the universe (assuming leptogenesis) is then correlated with CP
asymmetries possibly observable in accelerator experiments. Unfortunately,
there is a fly in the ointment. It was later shown by Raidal and Strumia [RS]
that there is a sign ambiguity which frustrates the above correlation. We note
that the Raidal-Strumia ambiguity is resolved in our models.


title: Strong Decays of N and Delta Resonances in the Point-Form Formalism

abstract:
  We present covariant predictions of relativistic constituent quark models for
pi and eta decay widths of N and Delta resonances. The results are calculated
for a model decay operator within the point-form spectator approximation. It is
found that most theoretical values underestimate the experimental data
considerably.


title: Higgsless Gauge Symmetry Breaking with a Large Mass Hierarchy

abstract:
  We propose a mechanism of Higgsless gauge symmetry breaking with a large mass
hierarchy. We consider a 5D gauge theory on an orbifold $S^1/Z_2$. The gauge
symmetry is broken by orbifolding and also nontrivial boundary conditions at
fixed points. All 4D modes which survive at low energies are found to be
localized around fixed points. Supersymmetry plays an important role in our
mechanism. The tree-level unitarity in our model is briefly discussed.


title:
Counting loop diagrams: computational complexity of higher-order
  amplitude evaluation

abstract:
  We discuss the computational complexity of the perturbative evaluation of
scattering amplitudes, both by the Caravaglios-Moretti algorithm and by direct
evaluation of the individual diagrams. For a self-interacting scalar theory, we
determine the complexity as a function of the number of external legs. We
describe a method for obtaining the number of topologically inequivalent
Feynman graphs containing closed loops, and apply this to one- and two-loop
amplitudes. We also compute the number of graphs weighted by their symmetry
factors, thus arriving at exact and asymptotic estimates for the average
symmetry factor of diagrams. We present results for the asymptotic number of
diagrams up to 10 loops, and prove that the average symmetry factor approaches
unity as the number of external legs becomes large.


title: Kaluza-Klein Dark Matter and the Positron Excess

abstract:
  The excess of cosmic positrons observed by the HEAT experiment may be the
result of Kaluza-Klein dark matter annihilating in the galactic halo.
Kaluza-Klein dark matter annihilates dominantly into charged leptons that yield
a large number and hard spectrum of positrons per annihilation. Given a
Kaluza-Klein dark matter particle with a mass in the range of 300-400 GeV, no
exceptional substructure or clumping is needed in the local distribution of
dark matter to generate a positron flux that explains the HEAT observations.
This is in contrast to supersymmetric dark matter that requires unnaturally
large amounts of dark substructure to produce the observed positron excess.
Future astrophysical and collider tests are outlined that will confirm or rule
out this explanation of the HEAT data.


title: Inelastic multiparticle collisions in a parton cascade

abstract:
  We elaborate on a new 3+1 dimensional Monte Carlo parton cascade solving
kinetic Boltzmann processes including - for the first time - inelastic
multiplication processes (gg <-->ggg) in a unified manner. The back reaction
channel is treated fully consistently, exactly obeying detailed balance. The
algorithm can handle, in principle, any specified initial conditions for the
freed partons, the latter being on their kinetic mass shell. First full
simulations with minijet initial conditions demonstrate that the inclusion of
the inelastic channels leads to a very fast kinetic and chemical equilibration
and also to an early creation of pressure.


title:
Pade-related resummations of the pressure of quark-gluon plasma by
  approximate inclusion of g**6-terms

abstract:
  We perform various resummations of the hot QCD pressure based on the actual
knowledge of the perturbation series which includes the g**6 ln(1/g) and part
of the g**6 terms. Resummations are performed separately for the short- and
long-distance parts. The g**6 term of the short-distance pressure is estimated
on the basis on the known UV cutoff dependence of the long-distance part. The
resummations are of the Pade and Borel-Pade type, using in addition the
(Pade-)resummed expression for the squared screening mass mE**2 and for the
EQCD coupling parameter gE**2. The resummed results depend weakly on the yet
unknown g**6 terms and on the the short-range renormalization scale, at all
temperatures. The dependence on the long-range renormalization scale is
appreciable at low temperatures T < 1 GeV. The resulting dependence of pressure
on temperature T is compatible with the results of the lattice calculations at
low T.


title:
Phenomenological constraints on broken R parity symmetry in
  supersymmetry models

abstract:
  The R parity odd renormalizable Yukawa interactions of quarks and leptons
with the scalar superpartners have the ability to violate the baryon and lepton
numbers, change the hadron and lepton flavors and make the lightest
supersymmetric particle unstable. The existence of an approximate R parity
symmetry would thus affect in a deep way the conventional framework of the
Minimal Supersymmetric Standard Model where an exact R parity symmetry is
built-in by assumption. The purpose of the present review is to survey in a
systematic way the direct experimental constraints set on the R parity
violating couplings by the low and intermediate energy physics processes. We
consider first the option of bilinear R parity violation and spontaneously
broken R parity symmetry and proceed next to the trilinear R parity violating
interactions. The discussion aims at surveying the indirect coupling constant
bounds derived from fundamental tests of the Standard Model and the variety of
scattering and rare decay processes. We also discuss the constraints imposed by
the renormalization group scale evolution and the cosmological and
astrophysical phenomenology.


title: Skyrmions and pentaquarks in the quark-hadron continuity perspective

abstract:
  We argue that in the color-flavor-locking (CFL) superconducting phase
classical soliton solutions can exist, whose excitations should be interpreted
as states formed by a quark (or an antiquark) and condensed diquarks. This
finding extends the picture of quark-hadron-continuity showing the existence of
a region, intermediate between the CFL and the hypernuclear phase, where chiral
solitons and Nambu Goldstone bosons can exist. We derive an expression of the
soliton mass in terms of the QCD coupling, $g_s$, and the Nambu Goldstone boson
parameters. From the quark-hadron continuity we can draw an argument in favor
of the interpretation of the $\Theta^+(1540)$ particle in terms of a strange
antiquark and two highly correlated $ud$ pairs (diquarks).


title:
Gauge Field Fluctuations and First-Order Phase Transition in Color
  Superconductivity

abstract:
  We study the gauge field fluctuations in dense quark matter and determine the
temperature of the induced first-order phase transition to the
color-superconducting phase in weak coupling. We find that the local
approximation of the coupling between the gauge potential and the order
parameter, employed in the Ginzburg-Landau theory, has to be modified by
restoring the full momentum dependence of the polarization function of gluons
in the superconducting phase.


title: Quark Dipole Operators in Extended Technicolor Models

abstract:
  We study diagonal and transition quark dipole operators in a class of
extended technicolor (ETC) models, taking account of the multiscale nature of
the ETC gauge symmetry breaking and of the mixing among ETC interaction
eigenstates. Because of this mixing, terms involving the lowest ETC scale can
play an important role in dipole operators, and we focus on these terms. We
derive from experiment new correlated constraints on the quark mixing angles
and phases. Our bounds yield information on mixing angles individually in the
up- and down-sectors, for both left- and right-handed quark fields and thus
constrain even quark mixing parameters that do not enter in the CKM matrix.
With phases of order unity, we conclude that these mixing angles are small,
constraining future ETC model building, but plausibly in the range suggested by
the size of the CKM elements. These values still allow substantial deviations
from the standard model predictions, in particular for several CP violating
quantities, including the asymmetries in $b \to s \gamma$ and $B_{d} \to \phi
K_S$, $Re(\epsilon^\prime/\epsilon)$, and the electric dipole moments of the
neutron and the ${}^{199}$Hg atom.


title:
Neutralino dark matter scattering and $B_s \to \mu^+ \mu^-$ in SUSY
  models

abstract:
  It is pointed out that there is a strong correlation between the neutralino
dark matter scattering cross section $\sigma_{\tilde{\chi} p}$ and the
branching ratio for $B_s \to \mu^+ \mu^-$ within minimal supergravity (mSUGRA)
and its extensions. This correlation arises mainly from $\tan\beta$ and heavy
neutral Higgs mass dependence, and shows a nice interplay between vastly
different two observables within supersymmetric models. Current upper limit on
$B(B_s \to \mu^+ \mu^-) < 5.8 \times 10^{-7}$ excludes substantial parameter
space where $\sigma_{\tilde{\chi} p}$ is within the CDMS sensitivity region.


title: One Loop Predictions of the Finely Tuned SSM

abstract:
  We study the finely tuned SSM, recently proposed by Arkani-Hamed and
Dimopoulos, at the one loop level. The runnings of the four gaugino Yukawa
couplings, the mu term, the gaugino masses, and the Higgs quartic coupling are
computed. The Higgs mass is found to be 130 - 170 GeV for M_s > 10^6 GeV. If
the Yukawa coupling constants are measured at the 1% level, this can determine
the SUSY breaking scale to within an order of magnitude. Measuring the
relationships between the couplings to this accuracy provides a striking signal
for this model.


title: Decoherent Neutrino Mixing, Dark Energy and Matter-Antimatter Asymmetry

abstract:
  A CPT violating decoherence scenario can easily account for all the
experimental evidence in the neutrino sector including LSND. In this work it is
argued that this framework can also accommodate the Dark Energy content of the
Universe, as well as the observed matter-antimatter asymmetry.


title: Light-Front Approach for Pentaquark Strong Decays

abstract:
  Assuming the two diquark structure for the pentaquark state as advocated in
the Jaffe-Wilczek model, we study the strong decays of light and heavy
parity-even pentaquark states using the light-front quark model in conjunction
with the spectator approximation. The narrowness of the Theta width is ascribed
to the p-wave configuration of the diquark pair. Taking the Theta width as a
benchmark, we estimate the rates of the strong decays Xi_{3/2}-- to Xi- pi-,
Sigma- K-, Sigma_{5c}0 to D_s- p, D_{s0}*- p and Xi_{5c}0 to D_s- Sigma+,
D_{s0}^{*-} Sigma+ with Sigma_{5c} Xi_{5c} being antisextet charmed pentaquarks
and D_{s0}* a scalar strange charmed meson. The ratio of Gamma(P_c to Baryon
D_{s0}*)/Gamma(P_c to Baryon D_s) is very useful for verifying the parity of
the antisextet charmed pentaquark P_c. It is expected to be of order unity for
an even parity P_c and much less than one for an odd parity pentaquark.


title: Can an invisible Higgs boson be seen via diffraction at the LHC?

abstract:
  We study the possibility of observing an `invisible' Higgs boson in central
exclusive diffractive production at the LHC. We evaluate the cross section
using, as a simple example, the Standard Model with a heavy fourth generation,
where the invisible decay mode $H \to \nu_4 \bar{\nu}_4$ dominates, with the
heavy neutrino mass $M(\nu_4) \simeq 50$ GeV. We discuss the possible
requirements on trigger conditions and the background processes.


title:
Fast simulation of jet quenching in ultrarelativistic heavy ion
  collisions

abstract:
  The method for simulation of medium-induced rescattering and energy loss of
hard partons in ultrarelativistic heavy ion collisions is developed. The model
is realized as fast Monte-Carlo tool implemented to modify standard PYTHIA jet
event.


title: R-parity violating supersymmetry

abstract:
  Theoretical and phenomenological implications of R-parity violation in
supersymmetric theories are discussed in the context of particle physics and
cosmology. Fundamental aspects include the relation with continuous and
discrete symmetries and the various allowed patterns of R-parity breaking.
Recent developments on the generation of neutrino masses and mixings within
different scenarios of R-parity violation are discussed. The possible
contribution of R-parity-violating Yukawa couplings in processes involving
virtual supersymmetric particles and the resulting constraints are reviewed.
Finally, direct production of supersymmetric particles and their decays in the
presence of R-parity-violating couplings is discussed together with a survey of
existing constraints from collider experiments.


title:
Enhanced lepton flavour violation in the supersymmetric inverse seesaw
  model

abstract:
  We discuss a supersymmetric inverse seesaw model in which lepton flavour
violating decays can be enhanced either by flavour violating slepton
contributions or by the non-unitarity of the charged current mixing matrix. As
an example we calculate Br(mu -> e gamma) taking into account both heavy lepton
exchange as well as supersymmetric diagrams in a minimal supergravity
framework. We find that the for the same parameters the rate can be enhanced
with respect to seesaw model expectations, with or without supersymmetry.


title: Quark masses and mixing angles in heterotic orbifold models

abstract:
  We study systematically the possibility for realizing realistic values of
quark mass ratios $m_c/m_t$ and $m_s/m_b$ and the mixing angle $V_{cb}$ by
using only renormalizable Yukawa couplings derived from heterotic orbifold
models. We assume one pair of up and down sector Higgs fields. We show
realistic examples including hierarchical and democratic forms of Yukawa
matrices.


title:
Analysis of identified particle yields and Bose-Einstein (HBT)
  correlations in p+p collisions at RHIC

abstract:
  Simultaneous Buda-Lund hydro model fits are presented to identified particle
spectra and two-particle Bose-Einstein correlations as measured by the STAR
collaboration in $\sqrt{s}=200$ GeV p+p collisions at RHIC. Preliminary results
are compared to similar results in Au+Au collisions at RHIC, hadron+p reactions
as well as Pb+Pb collisions at CERN SPS.


title: From pions to pentaquarks

abstract:
  I overview the physical picture of QCD at low energies that has led to the
prediction of a narrow exotic baryon Theta^+ which cannot be made of three
quarks. The very narrow width of the Theta^+ and a possible reason why it is
seen in low- but not in high-energy experiments are briefly discussed.


title: New Uncertainties in QCD-QED Rescaling Factors using Quadrature Method

abstract:
  In this paper we briefly outline the quadrature method for estimating
uncertainties in a function of several variables and apply it to estimate the
numerical uncertainties in QCD-QED rescaling factors. We employ here the
one-loop order in QED and three-loop order in QCD evolution equations of
fermion mass renormalization. Our present calculations are found to be new and
also reliable compared to the earlier values employed by various authors.


title:
Gauge invariance, infrared/collinear singularities and tree level matrix
  element for e+ e- to nu_e bar nu_e gamma gamma

abstract:
  One of the necessary steps in constructing high precision option of KKMC was
to install the double bremsstrahlung matrix element for the process e+ e- to
nu_e bar nu_e into the scheme of Coherent Exclusive Exponentiation. The process
is also interesting because of gauge cancellation of contributions for photon
emission from incoming fermion lines and t-channel W. The QED U(1) gauge
properties require terms of the triple and quatric gauge couplings to be taken
into considerations as well. Thanks to expansion starting from the
approximation of contact interaction, good example to study the internal
structure of the amplitude is available.
  In the developed scheme, natural separation of the complete amplitude into
gauge invariant parts is straightforward. Each part has well defined physical
interpretation, which after partial integration over phase space provides
terms: infrared singular, leading log, next-to-leading-log, etc. Contributions
related to triple and quatric gauge coupling of W (extracted with the help of
expansion around contact W-interaction), have been ordered as well. The
separation is also helpful, to define extrapolation/reduction procedure of CEEX
exponentiation for the nu_e channel.


title:
Two-loop QCD Corrections to the Heavy Quark Form Factors: the Vector
  Contributions

abstract:
  We present closed analytic expressions of the electromagnetic vertex form
factors for heavy quarks at the two-loop level in QCD for arbitrary momentum
transfer. The calculation is carried out in dimensional regularization. The
electric and magnetic form factors are expressed in terms of 1-dimensional
harmonic polylogarithms of maximum weight 4.


title:
Universal Neutrino Mass Hierarchy and Cosmological Baryon Number
  Asymmetry

abstract:
  We conjecture that three light Majorana neutrinos and their right-handed
counterparts may have a universal geometric mass hierarchy. Incorporating this
phenomenological conjecture with the Fritzsch texture of lepton mass matrices
in a simple seesaw mechanism, we show that it is possible to simultaneously
account for current neutrino oscillation data and the cosmological baryon
number asymmetry via leptogenesis.


title:
Early SU(4)_PS x SU(2)_L x SU(2)_R x SU(2)_H Unification of Quarks and
  Leptons

abstract:
  We discuss various aspects of the early petite unification (PUT) of quarks
and leptons based on the gauge group G_PUT=SU(4)_PS x SU(2)_L x SU(2)_R x
SU(2)_H. This unification takes place at the scale M= O(1-2 TeV) and gives the
correct value of sin^2 theta_W(M_Z^2) without the violation of the upper bound
on the K_L -> mu e rate and the limits on FCNC processes. These properties
require the existence of three new generations of unconventional quarks and
leptons with charges up to 4/3 (for quarks) and 2 (for leptons) and masses
O(250 GeV) in addition to the standard three generations of quarks and leptons.
The horizontal group SU(2)_H connects the standard fermions with the
unconventional ones. We work out the spontaneous symmetry breaking (SSB) of the
gauge group G_PUT down to the SM gauge group, generalize the existing one-loop
renormalization group (RG) analysis to the two-loop level including the
contributions of Higgs scalars and Yukawa couplings, and demonstrate that the
presence of three new generations of heavy unconventional quarks and leptons
with masses O(250 GeV) is consistent with astrophysical constraints. The NLO
and Higgs contributions to the RG analysis are significant while the Yukawa
contributions can be neglected.


title: Texture Zeros and CP-violating Phases in the Neutrino Mass Matrix

abstract:
  We stress that specific texture zeros of lepton mass matrices, which might
dynamically arise from a new kind of flavor symmetry, can help us to establish
simple and testable relations between the lepton flavor mixing parameters and
lepton mass ratios. We present a brief review of one-zero, two-zero and
three-zero textures of the neutrino mass matrix. Their phenomenological
consequences on neutrino mixing and CP violation are also discussed.


title: Instantaneous Bethe-Salpeter Equation and Its Exact Solution

abstract:
  We present an approach to solve a Bethe-Salpeter (BS) equation exactly
without any approximation if the kernel of the BS equation exactly is
instantaneous, and take positronium as an example to illustrate the general
features of the solutions. As a middle stage, a set of coupled and
self-consistent integration equations for a few scalar functions can be
equivalently derived from the BS equation always, which are solvable
accurately. For positronium, precise corrections to those of the Schr\"odinger
equation in order $v$ (relative velocity) in eigenfunctions, in order $v^2$ in
eigenvalues, and the possible mixing, such as that between $S$ ($P$) and $D$
($F$) components in $J^{PC}=1^{--}$ ($J^{PC}=2^{++}$) states as well, are
determined quantitatively. Moreover, we also point out that there is a
problematic step in the classical derivation which was proposed first by E.E.
Salpeter. Finally, we emphasize that for the effective theories (such as NRQED
and NRQCD etc) we should pay great attention on the corrections indicated by
the exact solutions.


title: Representation Mixing and Exotic Baryons in the Skyrme Model

abstract:
  We study the effect of representation mixing in the SU(3) Skyme model by
diagonalizing exactly the representation-dependent part. It is observed that
even without the next-to-leading order symmetry breaking terms the low-lying
baryon masses as well as the recently discovered $\Theta+$ and
$\Cascade_{\bar{10}}$ can be fairly well reproduced within 3% accuracy. It is
also demonstrated that the mixing effect is not negligible in decay processes
of $\{\bar{10}\}$. In particular the effect of mixing with $\{27\}$ is found to
be quite large. These results are compatible with the second-order perturbation
scheme. The decay widths are found to be sensitive to the mass values. The
decay widths of $\{\bar{10}\}$ are estimated to be smaller than those of
$\{10\}$ by an order of magnitude due to the destuctive interference between
operators although the kinematic factors are comparable.


title: Evaluating multiloop Feynman integrals by Mellin-Barnes representation

abstract:
  The status of analytical evaluation of double and triple box diagrams is
characterized. The method of Mellin-Barnes representation as a tool to evaluate
master integrals in these problems is advocated. New MB representations for
massive on-shell double boxes with general powers of propagators are presented.


title:
Analytical Evaluation of Dimensionally Regularized Massive On-Shell
  Double Boxes

abstract:
  The method of Mellin-Barnes representation is used to calculate dimensionally
regularized massive on-shell double box Feynman diagrams contributing to Bhabha
scattering at two loops.


title: B-L Cosmic strings and Baryogenesis

abstract:
  Cosmic strings arising from breaking of the $U(1)_{B-L}$ gauge symmetry that
occurs in a wide variety of unified models can carry zero modes of heavy
Majorana neutrinos. Decaying and/or repeatedly self-interacting closed loops of
these ``$B-L$'' cosmic strings can be a non-thermal source of heavy
right-handed Majorana neutrinos whose decay can contribute to the observed
baryon asymmetry of the Universe (BAU) via the leptogenesis route. The $B-L$
cosmic strings are expected in GUT models such as SO(10), where they can be
formed at an intermediate stage of symmetry breaking well below the GUT scale
$\sim 10^{16}$ GeV; such light strings are not excluded by the CMB anisotropy
data and may well exist. We estimate the contribution of $B-L$ cosmic string
loops to the baryon-to-photon ratio of the Universe in the light of current
knowledge on neutrino masses and mixings implied by atmospheric and solar
neutrino measurements. We find that $B-L$ cosmic string loops can contribute
significantly to the BAU for $U(1)_{B-L}$ symmetry breaking scale
$\eta_{B-L}\gsim 1.7\times 10^{11}\gev$. At the same time, in order for the
contribution of decaying $B-L$ cosmic string loops not to exceed the observed
baryon-to-photon ratio inferred from the recent WMAP results, the lightest
heavy right-handed Majorana neutrino mass $M_1$ must satisfy the constraint
$M_1 \leq 2.4 \times 10^{12}(\eta_{B-L}/10^{13}\gev)^{1/2}\gev$. This may have
interesting implications for the associated Yukawa couplings in the heavy
neutrino sector and consequently for the light neutrino masses generated
through see-saw mechanism.


title:
CP asymmetry, branching ratios and isospin breaking effects of B -> K*
  gamma with the perturbative QCD approach

abstract:
  The radiative B -> K* gamma mode is caused by a penguin operator which is a
quantum correction. Thus this mode may be useful in the search for physics
beyond the standard model. In this paper, we compute the branching ratio,
direct CP asymmetry, and isospin breaking effects within the Standard Model in
the framework perturbative QCD, and discuss how new physics might show up in
this decay.


title: Status of Global Analysis of Neutrino Oscillation Data

abstract:
  In this talk we discuss some details of the analysis of neutrino data and our
present understanding of neutrino masses and mixing. This talk is based on
hep-ph/0306001, hep-ph/0306226 and hep-ph/0404085.


title:
Consistency relations and degeneracies in (non)commutative patch
  inflation

abstract:
  The consistency equations of patch inflation are considered in a
next-to-leading-order slow-roll (SR) expansion. Some general aspects of
braneworld degeneracy are pointed out, both with an ordinary scalar field and a
Born-Infeld tachyon. The discussion is then extended to the maximally symmetric
noncommutative case.


title: Shear Viscosity in a CFL Quark Star

abstract:
  We compute the mean free path and shear viscosity in the color-flavor locked
(CFL) phase of dense quark matter at low temperature T, when the contributions
of mesons, quarks and gluons to the transport coefficients are Boltzmann
suppressed. CFL quark matter displays superfluid properties, and transport
phenomena in such cold regime are dominated by phonon-phonon scattering. We
study superfluid phonons within thermal field theory and compute the mean free
path associated to their most relevant collision processes. Small-angle
processes turn out to be more efficient in slowing transport phenomena in the
CFL matter, while the mean free path relevant for the shear viscosity is less
sensitive to collinear scattering due to the presence of zero modes in the
Boltzmann equation. In analogy with superfluid He4, we find the same T power
law for the superfluid phonon damping rate and mean free path. Our results are
relevant for the study of rotational properties of compact stars, and correct
wrong estimates existing in the literature.


title: A model of CP Violation from Extra Dimension

abstract:
  We construct a realistic model of CP violation in which CP is broken in the
process of dimensional reduction and orbifold compactification from a five
dimensional theories with $SU(3)\times SU(3) \times SU(3)$ gauge symmetry. CP
violation is a result of the Hosotani type gauge configuration in the higher
dimension.


title: Pentaquark Decay Amplitudes From SU(3) Flavor Symmetry

abstract:
  The experimental signature of an S=+1 baryon of mass 1540 MeV and width 10-25
MeV has led to speculation that this is an exotic baryon consisting of 4 quarks
and 1 antiquark lying at the top of a $\bar{10}$ SU(3) multiplet. The observed
decay modes are $\Theta^{+} \to K^{+}n$ and $\Theta^{+} \to K^0_Sp$ or in terms
of flavor multiplets, $\bar{10}$ to 8 x 8. The effective Hamiltonian for this
decay can be written as a flavor singlet piece plus an SU(3) breaking term. By
using the Wigner-Eckart thereom, we then relate the decay amplitudes of all 10
members of the antidecuplet in terms of 5 parameters. Similarly, we perform the
same calculation for the proposed exotic multiplets 27 and 35.


title:
Sensitivity to the Standard Model Higgs Boson in Exclusive Double
  Diffraction

abstract:
  We use a Monte Carlo implementation of recently developed models of double
diffraction to assess the sensitivity of the LHC experiments to Standard Model
Higgs bosons produced in exclusive double diffraction. The signal is difficult
to extract, due to experimental limitations related to the first level trigger,
and to contamination by inclusive double diffractive background. Assuming the
above difficulties can be overcome, the expected signal-to-background ratio is
presented as a function of the experimental resolution on the missing mass.
Injecting a missing mass resolution of 2 GeV, a signal-to-background ratio of
about 0.5 is obtained; a resolution of 1 GeV brings a signal to background
ratio of 1. This result is lower than previous estimates, and the discrepancy
is explained.


title: Electroweak phase transition in a nonminimal supersymmetric model

abstract:
  The Higgs potential of the minimal nonminimal supersymmetric standard model
(MNMSSM) is investigated within the context of electroweak phase transition. We
investigate the allowed parameter space yielding correct electroweak phase
transitoin employing a high temperature approximation. We devote to
phenomenological consequences for the Higgs sector of the MNMSSM for
electron-positron colliders. It is observed that a future $e^+ e^-$ linear
collider with $\sqrt{s} = 1000$ GeV will be able to test the model with regard
to electroweak baryogenesis.


title:
The role of finite kinematic bounds in the induced gluon emission from
  fast quarks in a finite size quark-gluon plasma

abstract:
  We study the influence of finite kinematic boundaries on the induced gluon
radiation from a fast quark in a finite size quark-gluon plasma. The
calculations are carried out for fixed and running coupling constant. We find
that for running coupling constant the kinematic correction to the radiative
energy loss is small for quark energy larger than about 5 GeV. Our results
differ both analytically and numerically from that obtained by the GLV group
[6]. The effect of the kinematic cut-offs is considerably smaller than reported
in [6].


title: Formation of monopoles and domain walls after brane inflation

abstract:
  We study cosmological defect formation after brane inflation. The
cosmological defects are corresponding to the branes that have less than three
spacial dimensions in the uncompactified spacetime. Contrary to the previous
arguments, production of monopoles and domain walls are not always negligible.
Monopoles and domain walls are formed by the branes extended between mother
branes.


title: Bounds on neutrino masses from leptogenesis in type-II see-saw models

abstract:
  The presence of the triplet $\Delta_{L}$ in left-right symmetric theories
leads to type-II see-saw mechanism for the neutrino masses. In these models,
assuming a normal mass hierarchy for the heavy Majorana neutrinos, we derive a
lower bound on the mass of the lightest of heavy Majorana neutrino from the
leptogenesis constraint. From this bound we establish a consistent picture for
the hierarchy of heavy Majorana neutrinos in a class of left right symmetric
models in which we identify the neutrino Dirac mass matrix with that of
Fritzsch type charged lepton mass matrix. It is shown that these values are
compatible with the current neutrino oscillation data.


title: Enhanced solar anti-neutrino flux in random magnetic fields

abstract:
  We discuss the impact of the recent KamLAND constraint on the solar
anti-neutrino flux on the analysis of solar neutrino data in the presence of
Majorana neutrino transition magnetic moments and solar magnetic fields. We
consider different stationary solar magnetic field models, both regular and
random, highlighting the strong enhancement in the anti-neutrino production
rates that characterize turbulent solar magnetic field models. Moreover, we
show that for such magnetic fields inside the Sun, one can constrain the
intrinsic neutrino magnetic moment down to the level of mu_nu lessthan few
times 10^-12 x mu_B irrespective of details of the underlying turbulence model.
This limit is more stringent than all current experimental sensitivities, and
similar to the most stringent bounds obtained from stellar cooling. We also
comment on the robustness of this limit and show that at most it might be
weakened by one order of magnitude, under very unlikely circumstances.


title:
Possible production of exotic baryonia in relativistic heavy-ion
  collisions

abstract:
  Properties of a hypothetical baryonium with the quark content
($uds\ov{u}\ov{d}\ov{s}$) are discussed. The MIT bag model predicts its mass to
be unexpectedly low, approximately 1210 MeV. Possible hadronic decay modes of
this state are analyzed. Ultrarelativistic heavy-ion collisions provide
favorable conditions for the formation of such particles from the baryon-free
quark-gluon plasma. We estimate multiplicities of such exotic baryonia on the
basis of a simple thermal model.


title:
Detailed Analysis of Proton Decay Rate in the Minimal Supersymmetric
  SO(10) Model

abstract:
  We consider the minimal supersymmetric SO(10) model, where only one {\bf 10}
and one $\bar{\bf 126}$ Higgs multiplets have Yukawa couplings with matter
multiplets. This model has the high predictive power for the Yukawa coupling
matrices consistent with the experimental data of the charged fermion mass
matrices, and all the Yukawa coupling matrices are completely determined once a
few parameters in the model are fixed. This feature is essential for definite
predictions to the proton decay rate through the dimension five operators. We
analyze the proton decay rate for the dominant decay modes $p \to K^{+}
\bar{\nu}$ by including as many free parameters as possible and varying them.
There are two free parameters in the Yukawa sector, while five in the Higgsino
sector. It is found that an allowed region exists when the free parameters in
the Higgs sector are tuned so as to cancel the proton decay amplitude. The
resultant proton lifetime is proportional to $1/\tan^2 \beta$ and the allowed
region eventually disappears as $\tan \beta$ becomes large.


title: Spectral density in resonance region and analytic confinement

abstract:
  We study the role of finite widths of resonances in a nonlocal version of the
Wick-Cutkosky model. The spectrum of bound states is known analytically in this
model and forms linear Regge tragectories. We compute the widths of resonances,
calculate the spectral density in an extension of the Breit-Wigner {\it ansatz}
and discuss a mechanism for the damping of unphysical exponential growth of
observables at high energy due to finite widths of resonances.


title:
CP Violation in the Neutral Higgs Sector of a Non-minimal Supersymmetric
  Standard Model with Multiple Higgs Singlets

abstract:
  The possibility of CP violation is studied in the Higgs sector of a
supersymmetric standard model with multiple Higgs singlets. The tree-level
Lagrangian in this model is assumed to conserve the CP symmetry. We find that
CP violation is viable in this model at the one-loop level, in an explicit way,
if the radiative corrections from the third generation of quarks and squarks
are taken into account. In the presence of explicit CP violation, at the
one-loop level, the upper bound on the mass of the lightest neutral Higgs boson
and the productions of the neutral Higgs bosons via the Higgsstrahlung process
in high-energy $e^+e^-$ collisions are calculated. We find that the upper bound
on the mass of the lightest neutral Higgs boson increases as the number of
Higgs singlets increases in a regulated manner. The production cross sections
of the neutral Higgs bosons also show a reasonable increasing behavior with
respect to the number of Higgs singlets.


title: Mass effects in the polarized virtual photon structure

abstract:
  We discuss target mass effects in the polarized virtual photon structure
functions $g_1^\gamma (x,Q^2,P^2)$, $g_2^\gamma (x,Q^2,P^2)$ for the kinematic
region $\Lambda^2\ll P^2 \ll Q^2$, where $-Q^2 (-P^2)$ is the mass squared of
the probe (target) photon. We obtain the expressions for the structure
functions in closed form by inverting the Nachtmann moments for the twist-2 and
twist-3 operators. Numerical analysis shows that target mass effects appear at
large $x$ and become sizable near the maximal value of $x$, as the ratio
$P^2/Q^2$ increases. Target mass effects for the QCD sum rules of $g_1^\gamma$
and $g_2^\gamma$ are also investigated.


title:
Fate of oscillating scalar fields in the thermal bath and their
  cosmological implications

abstract:
  Relaxation process of a coherent scalar field oscillation in the thermal bath
is investigated using nonequilibrium quantum field theory. The Langevin-type
equation of motion is obtained which has a memory term and both additive and
multiplicative noise terms. The dissipation rate of the oscillating scalar
field is calculated for various interactions such as Yukawa coupling,
three-body scalar interaction, and biquadratic interaction. When the background
temperature is larger than the oscillation frequency, the dissipation rate
arising from the interactions with fermions is suppressed due to the Pauli
blocking, while it is enhanced for interactions with bosons due to the induced
effect. In both cases, we find that the microphysical detailed balance relation
drives the oscillating field to a thermal equilibrium state. That is, for
low-momentum modes, the classical fluctuation-dissipation theorem holds and
they relax to a state the equipartition law is satisfied, while higher-momentum
modes reach the state the number density of each quanta consists of the thermal
boson distribution function and zero-point vacuum contribution. The
temperature-dependent dissipation rates obtained here are applied to the late
reheating phase of inflationary universe. It is found that in some cases the
reheat temperature may take somewhat different value from the conventional
estimates, and in an extreme case the inflaton can dissipate its energy without
linear interactions that leads to its decay. Furthermore the evaporation rate
of the Affleck-Dine field at the onset of its oscillation is calculated.


title:
Determination of theta_{23} in Long-Baseline Neutrino Oscillation
  Experiments with Three-Flavor Mixing Effects

abstract:
  We examine accuracy of theta_{23} determination in future long-baseline (LBL)
nu_{mu} disappearance experiments in the three-flavor mixing scheme of
neutrinos. Despite that the error of sin^2{2theta_{23}} is indeed a few % level
at around the maximal mixing, we show that the error of physics variable
s^2_{23} is large, delta(s^2_{23})/s^2_{23} \simeq 10-20%, depending upon
regions of theta_{23}. The errors are severely affected by the octant
degeneracy of theta_{23}, and delta(s^2_{23}) is largely amplified by the
Jacobian factor relating these two variables in a region near to the maximal
mixing. The errors are also affected by the uncertainty due to unknown value of
theta_{13}; delta(s^2_{23}) is doubled at off maximal in the second octant of
theta_{23} where the effect is largest. To overcome this problem, we discuss
combined analysis with nu_e appearance measurement in LBL experiments, or with
reactor measurement of theta_{13}. For possible relevance of sub-leading
effects even in the next-generation LBL experiments, we give a self-contained
derivation of the survival probability to the next to leading order in s^2_{13}
and Delta m^2_{21} / Delta m^2_{31}.


title:
Generalized Parton Distributions in the Light-Front Constituent Quark
  Model

abstract:
  The Generalized Parton Distributions (GPDs) of the nucleon are analyzed
within the relativistic constituent quark model formulated on the light-front.
It is shown that the matrix elements of the plus component of the one-body
vector current are plagued by spurious effects related to the dependence on the
hyperplane where the nucleon wave function is defined in terms of its
constituents. The physical GPDs can be extracted only from the matrix elements
of a transverse component of the one-body current. The loss of the
polinomiality property is then related to the neglect of the pair creation
process for non-vanishing values of the skewness. The need of implementing
effective many-body currents corresponding to the Z-graph is stressed and a
possible approach to achieve such a goal is proposed.


title: Discriminating neutrino mass models using Type II seesaw formula

abstract:
  In this paper we propose a kind of natural selection which can discriminate
the three possible neutrino mass models, namely the degenerate, inverted
hierarchical and normal hierarchical models, using the framework of Type II
seesaw formula. We arrive at a conclusion that the inverted hierarchical model
appears to be most favourable whereas the normal hierarchical model follows
next to it. The degenerate model is found to be most unfavourable. We use the
hypothesis that those neutrino mass models in which Type I seesaw term
dominates over the Type II left-handed Higgs triplet term are favoured to
survive in nature.


title: Branon dark matter

abstract:
  In the brane-world scenario, our universe is understood as a three
dimensional hypersurface embedded in a higher dimensional space-time. The
fluctuations of the brane along the extra dimensions are seen from the
four-dimensional point of view as new fields whose properties are determined by
the geometry of the extra space. We show that such branon fields can be
massive, stable and weakly interacting, and accordinlgy they are natural
candidates to explain the universe missing mass problem. We also consider the
possibility of producing branons non-thermally and their relevance in the
cosmic coincidence problem. Finally we show that some of the branon distinctive
signals could be detected in future colliders and in direct or indirect dark
matter searches.


title:
The Structure of Corrections to Electroweak Interactions in Higgsless
  Models

abstract:
  Recently, ``Higgsless'' models of electroweak symmetry breaking have been
proposed. Based on compactified five-dimensional gauge theories, these models
achieve unitarity of electroweak boson self-interactions through the exchange
of a tower of massive vector bosons rather than the exchange of a scalar Higgs
boson. In this paper, using deconstruction, we analyze the form of the
corrections to the electroweak interactions in a large class of these models,
allowing for arbitrary 5-D geometry, position-dependent gauge coupling, and
brane kinetic energy terms. We show that many models considered in the
literature, including those most likely to be phenomenologically viable, are in
this class. By analyzing the asymptotic behavior of the correlation function of
gauge currents at high momentum, we extract the exact form of the relevant
correlation functions at tree-level and compute the corrections to precision
electroweak observables in terms of the spectrum of heavy vector bosons. We
determine when nonoblique corrections due to the interactions of fermions with
the heavy vector bosons become important, and specify the form such
interactions can take. In particular we find that in this class of models, so
long as the theory remains unitary, S-4 c^2__W T > O(1), where S and T are the
usual oblique parameters. We concur with the result of Cacciapaglia et.al. that
small or negative S is possible -- though only at the expense of substantial
negative T at tree-level. Although we stress our results as they apply to
continuum 5-D models, they apply also to models of extended electroweak gauge
symmetries motivated by models of hidden local symmetry.


title: The colour triplet qqqbar cluster and pentaquark models

abstract:
  We study the properties of the colour triplet qqqbar quark cluster when
flavour symmetry is broken. The relevance of such a cluster for some models of
pentaquarks is then examined in the light of recent experimental signals.


title:
Unified Approach to Neutrino Oscillation and Decay Probabilities of
  Neutrino-Source Hadrons

abstract:
  In the framework of quantum field theory, we examine what physical
implications are included in the expectation values of the flavor neutrino
charges at the time $x^0$ with respesct to the state $\ket{\Psi(x^0)}$, which
is taken so as to coincide with the neutrino source state such as a charged
pion at the time $x^0_I$ ($< x^0$).


title: Diagnostic Decays of the X(3872)

abstract:
  The unusual properties of the X(3872) have led to speculation that it is a
weakly bound state of mesons, chiefly $D^0\bar D^{0*}$. Tests of this
hypothesis are investigated and it is proposed that measuring the $3\pi
J/\psi$, $\gamma J/\psi$, $\gamma \psi'$, $\bar K K^*$, and $\pi\rho$ decay
modes of the $X$ will serve as a definitive diagnostic of the molecule
hypothesis.


title: Supersymmetric Dark Matter, Inflation and Yukawa Quasi-Unification

abstract:
  The construction of supersymmetric grand unified models based on the
Pati-Salam gauge group and leading to a set of Yukawa quasi-unification
conditions is briefly reviewed. For each sign of mu, an appropriately chosen
condition from this set can allow an acceptable b-quark mass within the
constrained minimal supersymmetric standard model. The restrictions on the
parameter space which arise from the cold dark matter, b-->s gamma, muon
anomalous magnetic moment and collider requirements are also investigated. For
mu>0, a wide and natural range of parameters is allowed. On the contrary, the
mu<0 case is excluded by the combination of the cold dark matter and b-->s
gamma requirements. In the mu>0 case, the predicted neutralinos are possibly
detectable in the future direct cold dark matter searches. Moreover, the mu
term is generated via a Peccei-Quinn symmetry. The same model gives rise to a
new shifted inflationary scenario, which is based only on renormalizable terms
and does not suffer from the problem of monopole overproduction at the end of
inflation. Although inflation takes place at large values of the inflaton field
and, thus, supergravity corrections could invalidate it, this does not happen
provided that an extra gauge singlet with a superheavy vacuum expectation value
from D-terms is introduced and a specific Kaehler potential is used.


title: Freeze Out and the Boltzmann Transport Equation

abstract:
  Recently several works have appeared in the literature that addressed the
problem of Freeze Out in energetic heavy ion reaction and aimed for a
description based on the Boltzmann Transport Equation (BTE). In this paper we
develop a dynamical Freeze-Out description, starting from the BTE, pointing out
the basic limitations of the BTE approach, and the points where the BTE
approach should be modified.


title: Annihilation Radiation of Dark Matter in Heterotic Orbifold Models

abstract:
  Direct and indirect dark matter searches can potentially lead to the
discovery of Supersymmetry. In the specific context of heterotic orbifold
compactification scenarios, it is even possible to get some clues on the SUSY
breaking mechanism of the more fundamental underlying theory. In this paper, we
investigate the prospects for indirect detection of neutralino dark matter via
gamma-ray (continuum and line) and synchrotron radiation from the Galactic
center, in the context of AMSB scenarios in an effective heterotic framework,
which constitutes a consistent SUSY model between high energy theory and low
energy phenomenology.


title:
Schemes and Mechanisms of Neutrino Mixings (Oscillations) and a Solution
  of the Sun Neutrinos Deficit Problem

abstract:
  Three schemes of neutrino mixings (oscillations) are proposed. The problems
of origin of angle mixings, with the law of energy-momentum conservation and
disintegration of neutrino as wave pocket are solved. These two schemes belong
to mass mixings schemes, where mixing angles and oscillation lengths are
expressed via elements of mass matrix. The third scheme belongs to the charge
mixings scheme, where mixing parameters are expressed via neutrino weak
charges, as it takes place in the vector dominance model. Using experiments we
must decide which of these schemes is realized indeed. Analysis of the
resonance enhancement mechanism of neutrino oscillations in matter is
performed. It is shown that there are no indications on existence of this
effect. It is shown that the supposition that the neutrinos are Majorana
particles is not confirmed by accelerator experiments. Then only mixings
(oscillations) between Dirac neutrinos with different flavors without sterile
neutrinos can be realized. Using all the present experimental data and the
theoretical results the problem of Sun neutrinos deficit is analyzed. The
conclusion is: the primary Sun $\nu_e$ neutrinos are converted into mixtures of
three types of neutrinos $\nu_e, \nu_\mu, \nu_\tau$ in approximately equal
quantities.


title:
Why Breakup of Photons and Pions into Forward Dijets Is so Different:
  Predictions from Nonlinear Nuclear k_t-factorization

abstract:
  Based on an approach to non-Abelian propagation of color dipoles in a nuclear
medium we formulate a nonlinear k_t-factorization for the breakup of photons
and pions into forward hard dijets in terms of the collective
Weizs\"acker-Williams (WW) glue of nuclei. We find quite distinct practical
consequences of nonlinear nuclear k_t-factorization for interactions of
pointlike photons and non-pointlike pions. In the former case the large
transverse momentum p_t of jets comes from the intrinsic momentum of quarks and
antiquarks in the photon and nuclear effects manifest themselves as an
azimuthal decorrelation with an acoplanarity momentum of the order of the
nuclear saturation momentum Q_A. In the breakup of pions off free nucleons to
the leading order in pQCD the spectator parton has a small transverse momentum
and the hard dijet cross section is suppressed. In the breakup of pions off
heavy nuclei the forward hard jets are predicted to be entirely decorrelated.
We comment on the sensitivity of the pionic dijet cross section to the pion
distribution amplitude. The predicted distinction between the breakup of
photons and pions can be tested by the sphericity and thrust analysis of the
forward hadronic system in the COMPASS experiment at CERN.


title: QCD in beauty decays: successes and puzzles

abstract:
  The status of the heavy quark expansion for inclusive B decays is briefly
reviewed from the perspective of confronting theory with data and of extracting
the heavy quark parameters. A good agreement between properly applied theory
and new precision data is observed. Some recent applications to the exclusive
heavy flavor transitions are addressed. I recall the `1/2 > 3/2' paradox for
the transitions into the charm P-wave states.


title: Non-Fermi-Liquid Specific Heat of Normal Degenerate Quark Matter

abstract:
  We compute the low-temperature behavior of the specific heat of normal
(non-color-superconducting) degenerate quark matter as well as that of an
ultradegenerate electron gas. Long-range magnetic interactions lead to
non-Fermi-liquid behavior with an anomalous leading $T\ln T^{-1}$ term.
Depending on the thermodynamic potential used as starting point, this effect
appears as a consequence of the logarithmic singularity in the fermion
self-energy at the Fermi surface or directly as a contribution from the only
weakly screened quasistatic magnetic gauge bosons. We show that a calculation
of Boyanovsky and de Vega claiming the absence of a leading $T\ln T^{-1}$ term
missed it by omitting vector boson contributions to the internal energy. Using
a formulation which collects all nonanalytic contributions in bosonic ring
diagrams, we systematically calculate corrections beyond the well-known
leading-log approximation. The higher-order terms of the low-temperature
expansion turn out to also involve fractional powers $T^{(3+2n)/3}$ and we
explicitly determine their coefficients up to and including order $T^{7/3}$ as
well as the subsequent logarithmically enhanced term $T^3 \ln (c/T)$. We derive
also a hard-dense-loop resummed expression which contains the infinite series
of anomalous terms to leading order in the coupling and which we evaluate
numerically. At low temperatures, the resulting deviation of the specific heat
from its value in naive perturbation theory is significant in the case of
strongly coupled normal quark matter and thus of potential relevance for the
cooling rates of (proto-)neutron stars with a quark matter component.


title: Split Supersymmetry

abstract:
  The naturalness criterion applied to the cosmological constant implies a
new-physics threshold at 10^-3 eV. Either the naturalness criterion fails, or
this threshold does not influence particle dynamics at higher energies. It has
been suggested that the Higgs naturalness problem may follow the same fate. We
investigate this possibility and, abandoning the hierarchy problem, we use
unification and dark matter as the only guiding principles. The model recently
proposed by Arkani-Hamed and Dimopoulos emerges as a very interesting option.
We study it in detail, analysing its structure, and the conditions for
obtaining unification and dark matter.


title: Electric Dipole Moments of Leptons in the Presence of Majorana Neutrinos

abstract:
  We calculate the two-loop diagrams that give a non-zero contribution to the
electric dipole moment d_l of a charged lepton l due to possible Majorana
masses of neutrinos. Using the example with one generation of the Standard
Model leptons and two heavy right-handed neutrinos, we demonstrate that the
non-vanishing result for d_l first appears in order O(m_l m_\nu^2 G_F^2), where
m_\nu is the mass of the light neutrino and the see-saw type relation is
imposed. This effect is beyond the reach of presently planned experiments.


title:
One-loop anomalous couplings and matching conditions in the nonlinear
  realization of the SU(2) Higgs Model

abstract:
  We study the renormalization of the nonlinear realization of the SU(2) Higgs
model in the modified minimal subtraction renormalization scheme. We propose
that the effective field method with truncated operator series is trustworthy
even when the Higgs boson is relatively light. Using the technique of
background field method in the coordinate space, we derive the matching
conditions at tree and one loop order, both in the regions where the Higgs
boson is heavy and where it is light. We obtain the complete one-loop anomalous
couplings up to ${\Large O} (p^4)$ in the SU(2) Higgs model. We observe that
the contribution of the gauge bosons and the Goldstone bosons to the anomalous
couplings at the one-loop level is significant. By establishing the
correspondence between our coordinate space calculation and the momentum space
calculation that exists in the literature, we find agreement in all the
matching conditions in the heavy Higgs boson limit.


title:
Hadronic EDMs induced by the strangeness and constraints on
  supersymmetric CP phases

abstract:
  We consider hadronic CP violation induced by chromoelectric dipolemoments
(CEDMs) of light quarks and the QCD theta parameter ($?overline{?theta}$). We
concentrate on the strange quark CEDM especially in this paper. Using effective
CP violating nucleon interactions induced by the CEDMs and $?overline{?theta}$
with the SU(3) chiral Lagrangian technique, we calculate the EDMs for the
$^{199}$Hg atom, neutron and deuteron. We also discuss supersymmetric
contributions to the electric dipole moments with the mass insertion
approximations and give stringent constraints on the CP phases of the flavor
changing SUSY breaking terms.


title:
A Simple Statistical Model for Analysis of QGP-droplet (Fireball)
  Formation

abstract:
  We construct the density of states for quarks and gluons using the `Thomas -
Fermi model' for atoms and the `Bethe model' for nucleons as templates. With
parameters to take care of the plasma (hydrodynamical) features of the QGP with
a thermal potential for the interaction, we find a window in the parametric
space of the model where observable QGP droplets of $ \sim $ 5 fm radius can
occur with transition temperature in the range 140 MeV to 250 MeV. By matching
with the expectations of Lattice Gauge estimates of the QGP-hadron transitions,
we can further narrow the window, thereby restricting the allowed values of the
flow-parameters of the model.


title: CP, CPT and Rare Decays

abstract:
  We describe possible kaon physics goals to achieve with a high luminosity
phi-factory. We motivate the relevance to improve the present bounds on CPT
kaon physics quantities. Also, the interferometer machine phi-factory is useful
to study CP violating/conserving effects in kaon decays. Thus we investigate K
--> 3 pi amplitudes: charge asymmetries are interesting in charged kaon decays.
In the case of neutral kaon decays one can study directely K_S --> 3 pi or
interferences effects. Interference may also be used to study the CP even K_S
-->pi+ pi- pi0 and final state interactions.


title: Kaon mixing and the charm mass

abstract:
  We study contributions to the Delta S=2 weak Chiral Lagrangian producing
K0-K0bar mixing which are not enhanced by the charm mass. For the real part,
these contributions turn out to be related to the box diagram with up quarks
but, unlike in perturbation theory, they do not vanish in the limit m_u->0.
They increase the leading contribution to the K_L-K_S mass difference by ~10%.
This means that short distances amount to (90+-15)% of this mass difference.
For the imaginary part, we find a correction to the lambda_c^2 m_c^2 term of
-5% from the integration of charm, which is a small contribution to epsilon_K.
The calculation is done in the large-Nc limit and we show explicitly how to
match short and long distances.


title:
Prospects for the Observation of a Higgs Boson with $H\to\tau^+\tau^-\to
  l^+l^-\sla{p_t}$ Associated with One Jet at the LHC

abstract:
  The sensitivity of the LHC experiments to the Standard Model Higgs using
$H\to\tau\tau\to l^+l^-\sla{p_t}$ associated with one high $P_T$ jet in the
mass range $110 <M_H<150 \gev$/c$^2$ is investigated. A cut and Neural Network
based event selections are chosen to optimize the expected signal significance
with this decay mode. A signal significance of about $6.6 \sigma$ can be
achieved for $M_H=120 \gev$/c$^2$ with $30 $fb$^{-1}$ of integrated luminosity
for one experiment only. With this approach, experimental issues related to
tagging forward jets and to the application of a central jet veto are
simplified considerably.


title:
Three-Neutrino Oscillations of Atmospheric Neutrinos, theta13, Neutrino
  Mass Hierarchy and Iron Magnetized Detectors

abstract:
  We derive predictions for the Nadir angle (theta_n) dependence of the ratio
Nmu-/Nmu+ of the rates of the mu- and mu+ multi-GeV events, and for the mu- -
mu+ event rate asymmetry, A_{mu-mu+}=[Nmu- - Nmu+]/[Nmu- + Nmu+], in
iron-magnetized calorimeter detectors (MINOS, INO) in the case of 3-neutrino
oscillations of the atmospheric nu_mu and antinu_mu, driven by one neutrino
mass squared difference, |Delta m^2_{31}| >> Delta m^2_{21}. The asymmetry
A_{mu- mu+} (the ratio Nmu-/Nmu+) is shown to be particularly sensitive to the
Earth matter effects in the atmospheric neutrino oscillations, and thus to the
values of sin^2(theta13) and sin^2(theta23), theta13 and theta23 being the
neutrino mixing angles limited by the CHOOZ and Palo Verde experiments and that
responsible for the dominant atmospheric nu_mu -> nu_tau (antinu_mu ->
antinu_tau) oscillations. It is also very sensitive to the type of neutrino
mass spectrum which can be with normal (Delta m^2_{31}>0) or with inverted
(Delta m^2_{31} < 0) hierarchy. We find that for sin^2(theta23)>0.50, sin^2(2
theta13)>0.06 and Delta m^2_{31}=(2-3) 10^{-3} eV^2, the Earth matter effects
produce a relative difference between the integrated asymmetries barA_{mu- mu+}
and barA^{2nu}_{mu- mu+}$ in the mantle (cos(theta_n)=0.30-0.84) and core
(cos(theta_n)=0.84-1.0) bins, which is bigger in absolute value than ~15%, can
reach the values of (30-35)%, and thus can be sufficiently large to be
observable. The sign of the indicated asymmetry difference is anticorrelated
with the sign of Delta m^2_{31}. An observation of the Earth matter effects in
the Nadir angle distribution of the asymmetry A_{mu- mu+} (ratio Nmu-/Nmu+)
would clearly indicate that sin^2(2 theta13)>0.06 and sin^2(theta23)>0.50, and
would lead to the determination of the sign of Delta m^2_{31}.


title: Transport Theory beyond Binary Collisions

abstract:
  Using the Schwinger-Keldysh technique, we derive the transport equations for
a system of quantum scalar fields. We first discuss the general structure of
the equations and then their collision terms. Taking into account up to
three-loop diagrams in \phi^3 model and up to four-loop diagrams in \phi^4
model, we obtain the transport equations which include the contributions of
multi-particle collisions and particle production processes, in addition to
mean-field effects and binary interactions.


title: Testing the Noncommutative Standard Model at a Future Photon Collider

abstract:
  Extensions of the Standard Model of elementary particle physics to
noncommutative geometries have been proposed as a low energy limit of string
models. Independent of this motivation, one may consider such a model as an
effective field theory with higher-dimensional operators containing an
antisymmetric rank-two background field. We study the signals of such a
Noncommutative Standard Model (NCSM) and analyze the discovery potential of a
future photon collider, considering angular distributions in fermion pair
production.


title: Gauge Link Structure in Quark-Quark Correlators in hard processes

abstract:
  Distribution functions in hard processes can be described by quark-quark
correlators, nonlocal matrix elements of quark fields. Color gauge invariance
requires inclusion of appropriate gauge links in these correlators. For
transverse momentum dependent distribution functions, in particular important
for describing T-odd effects in hard processes, we find that new link
structures containing loops can appear in abelian and non-abelian theories. In
transverse moments, e.g. measured in azimuthal asymmetries, these loops may
enhance the contribution of gluonic poles. Some explicit results for the link
structure are given in high-energy leptoproduction and hadron-hadron
scattering.


title:
Ionization of Binary Bound States in a Strongly Coupled Quark-Gluon
  Plasma

abstract:
  Although at temperatures $T\gg \Lambda_{QCD}$ the quark-gluon plasma (QGP) is
a gas of weakly interacting quasiparticles (modulo long-range magnetism), it is
strongly interacting (sQGP) in the temperature range $(1-3) T_c$. One aspect of
these interactions is the existence of many binary bound states of
quasiparticles. Only $\bar q q$ ones have been so far directly seen on the
lattice, for charmed and light quarks, but other attractive channels in $ qg,
gg$ are likely to have them as well. It was argued in our previous paper that
such bound states account for a significant part of the bulk properties such as
density and pressure. Using the same model, we evaluate the energy loss $dE/dx$
due to the ionization of these states. We found that it is substantial, but
only in the narrow interval of temperatures $T=(1.4-1.7)T_c$. In contrast to
that, we show that radiative and elastic losses are not likely to be modified
much by binding, as the total density of color charges is close to what it is
for weakly coupled quasiparticles. These distinctions would be important for
understanding the energy dependence of jet quenching.


title: B-factory Signals for a Warped Extra Dimension

abstract:
  We study predictions for B-physics in a class of models, recently introduced,
with a non-supersymmetric warped extra dimension. In these models few ($\sim
3$) TeV Kaluza-Klein masses are consistent with electroweak data due to bulk
custodial symmetry. Furthermore, there is an analog of GIM mechanism which is
violated by the heavy top quark (just as in SM) leading to striking signals at
$B$-factories:(i) New Physics (NP) contributions to $\Delta F= 2$ transitions
are comparable to SM. This implies that, within this NP framework, the success
of SM unitarity triangle fit is a ``coincidence'' Thus, clean extractions of
unitarity angles via e.g. $B \to \pi \pi,\rho \pi, \rho \rho, DK$ are likely to
be affected, in addition to O(1) deviation from SM prediction in $B_s$ mixing.
(ii) O(1) deviation from SM predictions for $B \to X_s l^+ l^-$ in rate as well
as in forward-backward and direct CP asymmetry. (iii) Large mixing-induced CP
asymmetry in radiative B decays, wherein the SM unamibgously predicts very
small asymmetries. Also with KK masses 3 TeV or less, and with anarchic Yukawa
masses, contributions to electric dipole moments of the neutron are roughly 20
times larger than the current experimental bound so that this framework has a
"CP problem".


title: Looking for the Charged Higgs Boson

abstract:
  This review article starts with a brief introduction to the charged Higgs
boson (H^\pm) in the Minimal Supersymmetric Standard Model (MSSM). It then
discusses the prospects of a relatively light H^\pm boson search via top quark
decay at Tevatron/LHC, and finally a heavy H^\pm boson search at LHC. The
viable channels for H^\pm search are identified in both the cases, with
particular emphasis on the H^\pm --> tau + nu decay channel. The effects of NLO
QCD correction in the SM as well as the MSSM are discussed briefly.


title: Stability of Texture Zeros under Radiative Corrections in See-Saw Models

abstract:
  It has been shown that only certain neutrino mass matrices with texture zeros
are compatible with existing data. We discuss the stability of phenomenological
consequences of texture zeros under radiative corrections in the type-I see-saw
scenario. We show that under certain conditions additional patterns are allowed
due to these effects.


title: Model Independent Results for Heavy Quarkonium

abstract:
  We review a number of results for the spectrum and inclusive decays of heavy
quarkonium systems which can be derived from QCD under well controlled
approximations. They essentially follow from the hierarchy of scales in these
systems, which can be efficiently exploited using non-relativistic effective
field theories. In particular, we discuss under which conditions
non-relativistic potential models emerge as effective theories of QCD.


title: Formulae for a numerical computation of one-loop tensor integrals

abstract:
  In a previous paper a new approach has been introduced for computing,
recursively and numerically, one-loop tensor integrals. Here we describe a few
modifications of the original method that allow a more efficient numerical
implementation of the algorithm.


title:
On the Atmospheric Neutrino Oscillations, theta13 and Neutrino Mass
  Hierarchy

abstract:
  We give predictions for the up-down asymmetry in the Nadir angle dependence
of the ratio Nmu/Ne of the rates of the mu-like and e-like multi-GeV events
measured in water-Cerenkov detectors (Super-Kamiokande, etc.) in the case of
3-neutrino oscillations of the atmospheric nu_e (antinu_e) and nu_mu
(antinu_mu), driven by one neutrino mass squared difference, |Delta m^2_{atm}|
= |Delta m^2_{31}| ~ (2.0 - 3.0) 10^{-3} eV^2 >> Delta m^2_{21} = Delta
m^2_{sol}. This ratio is particularly sensitive to the Earth matter effects in
the atmospheric neutrino oscillations, and thus to the values of sin^2(theta13)
and sin^2(theta23), theta13 and theta23 being the neutrino mixing angle limited
by the CHOOZ and Palo Verde experiments and that responsible for the dominant
atmospheric nu_mu -> nu_tau (antinu_mu -> antinu_tau) oscillations,
respectively. It is also sensitive to the type of neutrino mass spectrum which
can be with normal (Delta m^2_{atm} > 0) or with inverted (Delta m^2_{atm} < 0)
hierarchy.


title: Estimating the Electromagnetic Chiral Lagrangian Coefficients

abstract:
  In the low energy region chiral perturbation theory including virtual photons
is used to derive the structure of the generating functional. The work we do is
performed within the three flavor framework and reaches up to next-to-leading
order. An Euclidian cut-off is introduced to separate the long- and
short-distance contributions. The long-distance part is evaluated in the ChPT
framework up to $\mathcal{O}(p^4)$. The short-distance part is achieved partly
from the work of J. Bijnens and J. Prades [1], through perturbative QCD and
factorization. A matching is made and the finite parts of the low-energy
constants (LECs) is determined by using already existing data of the QCD LECs
up to order $p^4$ [1],[2],[3].


title:
On the chemical equilibration of strangeness-exchange reaction in
  heavy-ion collisions

abstract:
  The strangeness-exchange reaction pi + Y -> K- + N is shown to be the
dynamical origin of chemical equilibration for K- production in heavy-ion
collisions up to beam energies of 10 A GeV. The hyperons occurring in this
process are produced associately with K+ in baryon-baryon and meson-baryon
interactions. This connection is demonstrated by the ratio K-/K+ which does not
vary with centrality and shows a linear correlation with the yield of pions per
participant. At incident energies above AGS this correlation no longer holds
due to the change in the production mechanism of kaons.


title:
Isolating vacuum amplitudes in quantum field calculations at finite
  temperature

abstract:
  In calculating Feynman diagrams at finite temperature, it is sometimes
convenient to isolate subdiagrams which do not depend explicitly on the
temperature. We show that, in the imaginary time formalism, such a separation
can be achieved easily by exploiting a simple method, due to M. Gaudin, to
perform the sum over the Matsubara frequencies. In order to manipulate freely
contributions which may be individually singular, a regularization has to be
introduced. We show that, in some cases, it is possible to choose this
regularization in such a way that the isolated subdiagrams can be identified
with analytical continuations of vacuum n-point functions. As an aside
illustration of Gaudin's method, we use it to prove the main part of a recent
conjecture concerning the relation which exists in the imaginary time formalism
between the expressions of a Feynman diagram at zero and finite temperature.


title: Hierarchy-Problem and a Bound State of 6 t and 6 $\bar{t}$

abstract:
  We propose a unification of some fine-tuning problems -- really in this
article only the problem of why the weak scale is so small in energy compared
to a presumed fundamental scale, being say the Planck scale -- by postulating
the zero or very small value of the cosmological constant not only for one but
for several vacua. This postulate corresponds to what we have called the
Multiple Point Principle, namely that there be many ``vacuum'' states with the
same energy density. We further assume that 6 top quarks and 6 anti-top quarks
can bind by Higgs exchange so strongly as to become tachyonic and form a
condensate. This gives rise to the possibility of having a phase transition
between vacua with and without such a condensate. The two vacua distinguished
by such a condensate will have the same cosmological constant provided the top
Yukawa coupling is about $1.1 \pm 0.2$, in good correspondence with the
experimental value. The further requirement that this value of the Yukawa
coupling, at the weak scale, be compatible with the existence of a third
vacuum, with a Higgs field expectation value of the order of the fundamental
scale, enforces a hierarchical scale ratio between the fundamental and weak
scales of order $10^{16}$ -- $10^{20}$.


title: Saturation in two-hard-scale processes at hadron colliders

abstract:
  A study of saturation effects in two-hard-scale hadronic processes such as
Mueller-Navelet jets is presented. The cross-sections are expressed in the
dipole framework while saturation is implemented via an extention of the
Golec-Biernat and Wusthoff model. The transition to saturation is found to be
more abrupt than in gamma*-gamma* cross-sections. Observables with a
potentially clear saturation signal are proposed.


title: Long distance expansion for the NJL model with SU(3) and U_A(1) breaking

abstract:
  This work is a follow up of recent investigations, where we study the
implications of a generalized heat kernel expansion, constructed to incorporate
non-perturbatively the effects of a non-commutative quark mass matrix in a
fully covariant way at each order of the expansion. As underlying Lagrangian we
use the Nambu -- Jona-Lasinio model of QCD, with $SU_f(3)$ and $U_A(1)$
breaking, the latter generated by the 't Hooft flavour determinant interaction.
The associated bosonized Lagrangian is derived in leading stationary phase
approximation (SPA) and up to second order in the generalized heat kernel
expansion. Its symmetry breaking pattern is shown to have a complex structure,
involving all powers of the mesonic fields allowed by symmetry. The considered
Lagrangian yields a reliable playground for the study of the implications of
symmetry and vacuum structure on the mesonic spectra, which we evaluate for the
scalar and pseudoscalar meson nonets and compare with other approaches and
experiment.


title:
Momentum Representation of Coulomb Wave Functions and Level Shifts in
  Bottomonium due to Charm Effects

abstract:
  Since effective potentials derived from Feynman diagrams are naturally given
in momentum space, we formulate the non-relativistic Coulomb problem entirely
in momentum representation. We give momentum wave functions for all quantum
numbers in one-dimensional integrals, even though they can be evaluated.
Angular momentum decomposed Green's functions are then compactly represented.
We apply this formalism to investigate the next to next leading order charm
effects on 1S bottomonium level shift. Our one insertion results are given
completely in analytic form and numerically agree with previous results. Our
two insertion results are also in agreement. The net effect of finite charm
mass is to decrease the bottom mass by 33 MeV, as determined through the
measured 1S energy.


title: Spin light of neutrino in gravitational fields

abstract:
  We predict a new mechanism for the spin light of neutrino ($SL\nu$) that can
be emitted by a neutrino moving in gravitational fields. This effect is studied
on the basis of the quasiclassical equation for the neutrino spin evolution in
a gravitational field. It is shown that the gravitational field of a rotating
object, in the weak-field limit, can be considered as an axial vector external
field which induces the neutrino spin procession. The corresponding probability
of the neutrino spin oscillations in the gravitational field has been derived
for the first time. The considered in this paper $SL\nu$ can be produced in the
neutrino spin-flip transitions in gravitational fields. It is shown that the
total power of this radiation is proportional to the neutrino gamma factor to
the fourth power, and the emitted photon energy, for the case of an ultra
relativistic neutrino, could span up to gamma-rays. We investigate the $SL\nu$
caused by both gravitational and electromagnetic fields, also accounting for
effects of arbitrary moving and polarized matter, in various astrophysical
environments. In particular, we discuss the $SL\nu$ emitted by a neutrino
moving in the vicinity of a rotating neutron star, black hole surrounded by
dense matter, as well as by a neutrino propagating in the relativistic jet from
a quasar.


title: Leptogenesis, neutrino mixing data and the absolute neutrino mass scale

abstract:
  Recent developments in thermal leptogenesis are reviewed. Neutrino mixing
data favor a simple picture where the matter-anti matter asymmetry is generated
by the decays of the heavy RH neutrinos mildly close to thermal equilibrium
and, remarkably, in the full non relativistic regime. This results into
predictions of the final baryon asymmetry not depending on the initial
conditions and with minimized theoretical uncertainties. After a short outline
of a geometrical derivation of the CP asymmetry bound, we derive analytic
bounds on the lightest RH neutrino mass and on the absolute neutrino mass
scale. Neutrino masses larger than 0.1 eV are not compatible with the minimal
leptogenesis scenario. We discuss how the results get just slightly modified
within the minimal supersymmetric standard model. In particular a conservative
lower bound on the reheating temperature, T_R \gtrsim 10^9 GeV, is obtained in
the relevant effective neutrino mass range tilde{m}_1 \gtrsim 3x10^{-3} eV. We
also comment on the existence of a `too-short-blanket problem' in connection
with the possibility of evading the leptogenesis neutrino mass bound.


title: Event Structure at RHIC from p-p to Au-Au

abstract:
  Several correlation analysis techniques are applied to p-p and Au-Au
collisions at RHIC. Strong large-momentum-scale correlations are observed which
can be related to local charge and momentum conservation during hadronization
and to minijet (minimum-bias parton fragment) correlations.


title:
Fermion masses in SUSY SO(10) with type II seesaw: a non-minimal
  predictive scenario

abstract:
  A predictive framework for fermion masses and mixing is given by the
supersymmetric SO(10) model with one 10, one bar126, one 126 and one 210 Higgs
representations, and type II seesaw dominating the neutrino mass matrix. We
investigate the origin of the tension between this model and lepton mixing data
and refine previous numerical analyses. We discuss an extension of the minimal
model that includes one 120 Higgs chiral superfield representation. This
exhausts the possible renormalizable contributions to the Yukawa sector. In
spite of the increase in the number of parameters the predictivity of the
minimal setting is not spoiled. We argue that the contributions to fermion
masses due to the doublet components of 120 can be naturally small compared to
those of 10 and 126, thus acting as a perturbation in the fermion mass
generation. The antisymmetric nature of the 120 Yukawa coupling affects at
leading order the determination of the mixing angles and it allows to remove
the inconsistencies between predictions and data on the neutrino parameters. An
improvement in the experimental bound on |Ue3| can tell this scenario from the
minimal model.


title:
Can the observed enhancement in the mass spectrum of p \bar p in J/\psi
  \to \gamma p \bar p be interpreted by a possible p \bar p bound state

abstract:
  Provided the enhancement in the $p \bar{p}$ spectrum in radiative decay
$J/\psi \to \gamma p \bar{p}$ observed by the BES collaboration is due to an
existence of a $p \bar{p}$ molecular state, we calculate its binding energy and
lifetime in the linear $\sigma$ model. We consider a possibility that the
enhancement is due to a $p \bar p$ resonance which is in either S-wave or
P-wave structure and compare our results with the data.


title:
Probing gluon helicity distribution and quark transversity through
  hyperon polarization in singly polarized pp collisions

abstract:
  We study the polarization of hyperon in different processes in singly
polarized $pp$ collisions, in particular its relation to the polarized parton
distributions. We show that by measuring hyperon polarization in particularly
chosen processes, one can extract useful information on these parton
distributions. We show in particular that, by measuring the $\Sigma^+$
polarization in high $p_T$ direct photon production process, one can extract
information on the gluon helicity distribution; and by measuring the transverse
polarization of hyeprons with high $p_T$ in singly polarized reactions, one can
obtain useful information on the transversity distribution. We present the
numerical results obtained for those hyperon polarizations using different
models for parton distribution function and those for the spin transfer in
fragmentation processes.


title: Constraints on Supersymmetric Grand Unified Theories from Cosmology

abstract:
  Within the context of SUSY GUTs, cosmic strings are generically formed at the
end of hybrid inflation. However, the WMAP CMB measurements strongly constrain
the possible cosmic strings contribution to the angular power spectrum of
anisotropies. We investigate the parameter space of SUSY hybrid (F- and D-
term) inflation, to get the conditions under which theoretical predictions are
in agreement with data. The predictions of F-term inflation are in agreement
with data, only if the superpotential coupling $\kappa$ is small. In
particular, for SUSY SO(10), the upper bound is $\kappa\lsim 7\times 10^{-7}$.
This fine tuning problem can be lifted if we employ the curvaton mechanism, in
which case $\kappa\lsim 8\times 10^{-3}$; higher values are not allowed by the
gravitino constraint. The constraint on $\kappa$ is equivalent to a constraint
on the SSB mass scale $M$, namely $M \lsim 2\times 10^{15}$ GeV. The study of
D-term inflation shows that the inflaton field is of the order of the Planck
scale; one should therefore consider SUGRA. We find that the cosmic strings
contribution to the CMB anisotropies is not constant, but it is strongly
dependent on the gauge coupling $g$ and on the superpotential coupling
$\lambda$. We obtain $g\lsim 2\times 10^{-2}$ and $\lambda \lsim 3\times
10^{-5}$. SUGRA corrections induce also a lower limit for $\lambda$.
Equivalently, the Fayet-Iliopoulos term $\xi$ must satisfy $\sqrt\xi \lsim
2\times 10^{15}$ GeV. This constraint holds for all allowed values of $g$.


title: Leading power SCET analysis of $e^+ e^- \to J/\psi g g$

abstract:
  Recently, Belle and BaBar Collaborations observed surprising suppression in
the endpoint $J/\psi$ spectrum, which stimulates us to examine the endpoint
behaviors of the $e^+ e^- \to J/\psi gg$ production. We calculate the $J/\psi$
momentum and angular distributions for this process within the framework of the
soft-collinear effective theory (SCET). The decreasing spectrum in the endpoint
region is obtained by summing the Sudakov logarithms. We also find a large
discrepancy between the NRQCD and SCET spectrum in the endpoint region even
before the large logarithms are summed, which is probably due to the fact that
only the scalar structure of the two-gluon system is picked out in the leading
power expansion. A comparison with the process $\Upsilon \to \gamma gg$ is
made.


title:
Analytic determination of the T-\mu phase diagram of the chiral quark
  model

abstract:
  Using a gap equation for the pion mass a nonperturbative method is given for
solving the chiral quark-meson model in the chiral limit at the lowest order in
the fermion contributions encountered in a large N_f approximation. The
location of the tricritical point is analytically determined. A mean field
potential is constructed from which critical exponents can be obtained.


title: Study of Sleptons at a Linear Collider - Supersymmetry Scenario SPS 1a

abstract:
  The properties of the light charged sleptons in $\ser\ser$, $\smur\smur$ and
$\stau_1\stau_1$ production are studied within the mSUGRA scenario SPS 1a.
Various method are presented to determine very precisely masses, angular
distributions, spin and couplings as well as the $\stau_1$ polarisation and
mixing parameter in the $\stau$ sector. The analysis is based on a complete
simulation of signal and background reactions assuming experimental conditions
of the TESLA $e^+e^-$ Linear Collider.


title: Schemes of Neutrino Mixings (Oscillations) and Their Mixing Matrices

abstract:
  Three schemes of neutrino mixings (oscillations) together with their mixing
matrices (analogous to Kabibbo-Kobayashi-Maskawa matrices) are considered. In
these schemes neutrino transitions are virtual if neutrino masses are
different. Two of them belong to the so called mass mixing schemes (mixing
parameters are expressed by elements of mass matrices) and the third scheme
belongs to the charge mixing scheme (mixing parameters are expressed through
charges). In the first scheme system of 6 equations for determination of the
all elements of the mass matrix (neutrino masses and transition widths) by
using experimental data are obtained. In the second and third ones the neutrino
mixing angles are equal or close to maximal angles ($\pi/4$). It is obvious
that the experiment must give an answer to the following question: Which of
these schemes is realized indeed?


title: Parity violation in hot QCD: why it can happen, and how to look for it

abstract:
  The arguments for the possibility of violation of P and CP symmetries of
strong interactions at finite temperature are presented. A new way of observing
these effects in heavy ion collisions is proposed -- it is shown that parity
violation should manifest itself in the asymmetry between positive and negative
pions with respect to the reaction plane. Basing on topological considerations,
we derive a {\it lower} bound on the magnitude of the expected asymmetry, which
may appear within the reach of the current and/or future heavy ion experiments.


title: Solution to the B -> pi K Puzzle in a Flavor-Changing Z' Model

abstract:
  Recent experiments suggest that certain B -> pi K branching ratios are
inconsistent with the standard model expectations. We show that a
flavor-changing Z' provides a solution to the problem. Electroweak penguin
amplitudes are enhanced by the Z' boson for select parameters. We discuss
implications for the Z' mass and its couplings to the standard model fermions.
We also show that the solution is consistent with constraints from the CP
asymmetries of the B -> phi K_S decay.


title:
Large Logarithms in the Beam Normal Spin Asymmetry of Elastic
  Electron--Proton Scattering

abstract:
  We study a parity-conserving single-spin beam asymmetry of elastic
electron-proton scattering induced by an absorptive part of the two-photon
exchange amplitude. It is demonstrated that excitation of inelastic hadronic
intermediate states by the consecutive exchange of two photons leads to
logarithmic and double-logarithmic enhancement due to contributions of hard
collinear quasi-real photons. The asymmetry at small electron scattering angles
is expressed in terms of the total photoproduction cross section on the proton,
and is predicted to reach the magnitude of 20-30 parts per million. At these
conditions and fixed 4-momentum transfers, the asymmetry is rising
logarithmically with increasing electron beam energy, following the high-energy
diffractive behavior of total photoproduction cross section on the proton.


title: Vacuum Cherenkov radiation

abstract:
  Within the classical Maxwell-Chern-Simons limit of the Standard-Model
Extension (SME), the emission of light by uniformly moving charges is studied
confirming the possibility of a Cherenkov-type effect. In this context, the
exact radiation rate for charged magnetic point dipoles is determined and found
in agreement with a phase-space estimate under certain assumptions.


title: LEP Data and the Stability of the Potential Confront the mSUGRA Model

abstract:
  The requirement that the supersymmetric scalar potential be stable in the
minimal supergravity (mSUGRA) model imposes an upper bound on the universal
gaugino mass $m_{1/2}$ as function of the common scalar mass $m_0$. Combining
this with the experimental lower bound on $m_{1/2}$ from LEP data, we find a
new lower bound on $m_0$, stronger than the one that comes from experimental
data alone. If the corresponding upper and lower limits on the superparticle
masses, presented in this letter, are found to be violated at Tevatron Run II
or at the LHC, it would imply that we are living on a false vacuum. Special
attention has been paid in estimating the uncertainties in these predictions
due to the choice of the renormalization scale. The implications of our limits
for the constraints obtained by indirect methods(SUSY dark matter, g - 2 of the
muon, $ b \to s \gamma$....) are briefly discussed.


title: Some comments on B -> pi pi decays

abstract:
  Isospin analysis has been used to constrain the CP-asymmetries in B -> pi pi
decays. In particular correlation between a weak phase \theta and a strong
phase \delta is obtained. Further using the experimental values for the
CP-average branching ratios, the following bounds on direct CP-asymmetries are
obtained: -0.35+/- 0.22=< C_{\pi ^+\pi^-}\leq 0; C_{\pi ^0\pi ^0}=-(2.4\pm 1.0)
C_{\pi ^+\pi ^-}. Constraints on mixing induced CP-asymmetries are also
discussed.


title: Two-pion bound state in sigma channel at finite temperature

abstract:
  We study how we can understand the change of the spectral function and the
pole location of the correlation function for sigma at finite temperature,
which were previously obtained in the linear sigma model with a resummation
technique called optimized perturbation theory. There are two relevant poles in
the sigma channel. One pole is the original sigma pole which shows up as a
broad peak at zero temperature and becomes lighter as the temperature
increases. The behavior is understood from the decreasing of the sigma
condensate, which is consistent with the Brown-Rho scaling. The other pole
changes from a virtual state to a bound state of pion-pion as the temperature
increases which causes the enhancement at the pion-pion threshold. The behavior
is understood as the emergence of the pion-pion bound state due to the
enhancement of the pion-pion attraction by the induced emission in medium. The
latter pole, not the former, eventually degenerates with pion above the
critical temperature of the chiral transition. This means that the observable
"sigma" changes from the former to the latter pole, which can be interpreted as
the level crossing of "sigma" and pion-pion at finite temperature.


title:
Study of the eightfold degeneracy with a standard $\beta$-Beam and a
  Super-Beam facility

abstract:
  The study of the eightfold degeneracy at a neutrino complex that includes a
standard $\beta$-Beam and a Super-Beam facility is presented for the first time
in this paper. The scenario where the neutrinos are sent toward a Megaton water
Cerenkov detector located at the Fr\'{e}jus laboratory (baseline 130 Km) is
exploited. The performance in terms of sensitivity for measuring the continuous
($\theta_{13}$ and $\delta$) and discrete (${sign} [ \Delta m^2_{23} ]$ and
${sign} [\tan (2\theta_{23}) ]$) oscillation parameters for the $\beta$-Beam
and Super-Beam alone, and for their combination has been studied. A brief
review of the present uncertainties on the neutrino and antineutrino
cross-sections is also reported and their impact on the discovery potential
discussed.


title:
Effect of neutral current interactions on high energy muon and electron
  neutrino propagation through the Earth

abstract:
  High energy electron and muon neutrino propagation through the Earth has been
performed using the Monte Carlo technique. We focused our attention on the
effect of neutral current deep inelastic interactions compared to that of
charged current ones. We have found that NCs do not produce any significant
effect with respect to the case in which only CCs are considered. Therefore we
conclude that NC interactions can be neglected without considerable loss of
accuracy. When computing upward-going neutrino fluxes a simple formula
describing the transmission probability, that depends on the neutrino direction
and energy and the CC cross section, can be used to account for the Earth
shadowing effect.


title: Direct SUSY dark matter detection-Theoretical rates due to the spin

abstract:
  The recent WMAP data have confirmed that exotic dark matter together with the
vacuum energy (cosmological constant) dominate in the flat Universe. Thus the
direct dark matter detection, consisting of detecting the recoiling nucleus, is
central to particle physics and cosmology. Supersymmetry provides a natural
dark matter candidate, the lightest supersymmetric particle (LSP). The relevant
cross sections arise out of two mechanisms: i) The coherent mode, due to the
scalar interaction and ii) The spin contribution arising from the axial
current. In this paper we will focus on the spin contribution, which is
expected to dominate for light targets.
  For both modes it is possible to obtain detectable rates, but in most models
the expected rates are much lower than the present experimental goals. So one
should exploit two characteristic signatures of the reaction, namely the
modulation effect and, in directional experiments, the correlation of the event
rates with the sun's motion.
  In standard non directional experiments the modulation is small, less than
two per cent. In the case of the directional event rates we like to suggest
that the experiments exploit two features, of the process, which are
essentially independent of the SUSY model employed, namely: 1) The
forward-backward asymmetry, with respect to the sun's direction of motion, is
very large and 2) The modulation is much larger, especially if the observation
is made in a plane perpendicular to the sun's velocity. In this case the
difference between maximum and minimum can be larger than 40 per cent and the
phase of the Earth at the maximum is direction dependent.


title:
The spread of the gluon k_t-distribution and the determination of the
  saturation scale at hadron colliders in resummed NLL BFKL

abstract:
  The transverse momentum distribution of soft hadrons and jets that accompany
central hard-scattering production at hadron colliders is of great importance,
since it has a direct bearing on the ability to separate new physics signals
from Standard Model backgrounds. We compare the predictions for the gluonic
k_t-distribution using two different approaches: resummed NLL BFKL and DGLAP
evolution. We find that as long as the initial and final virtualities (k_t)
along the emission chain are not too close to each other, the NLL resummed BFKL
results do not differ significantly from those obtained using standard DGLAP
evolution. The saturation momentum Q_s(x), calculated within the resummed BFKL
approach, grows with 1/x even slower than in the leading-order DGLAP case.


title:
Modular Cosmology, Thermal Inflation, Baryogenesis and Predictions for
  Particle Accelerators

abstract:
  Modular cosmology is plagued by overproduction of unwanted relics, gravitinos
and especially moduli, at relatively low energy scales. Thermal inflation
provides a compelling solution to this moduli problem, but invalidates most
baryogenesis scenarios. We propose a simple model in which the MSSM plus
neutrino mass term $(LH_u)^2$ is supplemented by a minimal flaton sector to
drive the thermal inflation, and make two crucial assumptions: the flaton
vacuum expectation value generates the $\mu$-term of the MSSM and $m_L^2 +
m_{H_u}^2 < 0$. The second assumption is particularly interesting in that it
violates a well known constraint, implying that there exists a nearby deep
non-MSSM vacuum, and provides a clear signature of our model which can be
tested at future particle accelerators. We show that our model leads to thermal
inflation followed by Affleck-Dine leptogenensis along the $LH_u$ flat
direction. A key feature of our leptogenesis scenario is that the $H_uH_d$ flat
direction is also induced to temporarily acquire a large value, playing a
crucial role in the leptogenesis, as well as dynamically shielding the field
configuration from the deep non-MSSM minimum, ensuring that the fields relax
into our MSSM vacuum.


title: Evaluating the Gapless Color-Flavor Locked Phase

abstract:
  In neutral cold quark matter that is sufficiently dense that the strange
quark mass M_s is unimportant, all nine quarks (three colors; three flavors)
pair in a color-flavor locked (CFL) pattern, and all fermionic quasiparticles
have a gap. We recently argued that the next phase down in density (as a
function of decreasing quark chemical potential mu or increasing strange quark
mass M_s) is the new ``gapless CFL'' (``gCFL'') phase in which only seven
quasiparticles have a gap, while there are gapless quasiparticles described by
two dispersion relations at three momenta. There is a continuous quantum phase
transition from CFL to gCFL quark matter at M_s^2/mu approximately equal to
2*Delta, with Delta the gap parameter. Gapless CFL, like CFL, leaves unbroken a
linear combination "Q-tilde" of electric and color charges, but it is a
Q-tilde-conductor with gapless Q-tilde-charged quasiparticles and a nonzero
electron density. In this paper, we evaluate the gapless CFL phase, in several
senses. We present the details underlying our earlier work which showed how
this phase arises. We display all nine quasiparticle dispersion relations in
full detail. Using a general pairing ansatz that only neglects effects that are
known to be small, we perform a comparison of the free energies of the gCFL,
CFL, 2SC, gapless 2SC, and 2SCus phases. We conclude that as density drops,
making the CFL phase less favored, the gCFL phase is the next spatially uniform
quark matter phase to occur. A mixed phase made of colored components would
have lower free energy if color were a global symmetry, but in QCD such a mixed
phase is penalized severely.


title: Quasi-particle Model in hot QCD

abstract:
  Magnetic quasi-particles in hot QCD predict Casimir scaling for the tension
$\sigma$ of spatial Wilson loops. Recently this scaling has been verified on
the lattice to 1--2% precision. We review how spatial loops tell us about the
nature of the plasma state.
  The strong first order nature for more than five colours and the fast drop of
the topological susceptibilty at $T_c$ found in simulations of hot quenched QCD
are consistent with a quasi-particle picture valid down to the critical
temperature. The magnetic quasi-particles will Bose condense in the ground
state below $T_c$, and may behave like a dilute Bose gas down to T=0. The model
fixes the diluteness as $\sigma/m_M^2$. This is a small number for all
temperatures.