title: An approach to permutation symmetry for the electroweak theory

abstract:
  The form of the leptonic mixing matrix emerging from experiment has, in the
last few years, generated a lot of interest in the so-called tribimaximal type.
This form may be naturally associated with the possibility of a discrete
permutation symmetry ($S_3$) among the three generations. However, trying to
implement this attractive symmetry has resulted in some problems and it seems
to have fallen out of favor. We suggest an approach in which the $S_3$ holds to
first approximation, somewhat in the manner of the old SU(3) flavor symmetry of
the three flavor quark model. It is shown that in the case of the neutrino
sector, a presently large experimentally allowed region can be fairly well
described in this first approximation.
  We briefly discuss the nature of the perturbations which are the analogs of
the Gell-Mann Okubo perturbations but confine our attention for the most part
to the $S_3$ invariant model. We postulate that the $S_3$ invariant mass
spectrum consists of non zero masses for the $(\tau,b,t)$ and zero masses for
the other charged fermions but approximately degenerate masses for the three
neutrinos. The mixing matrices are assumed to be trivial for the charged
fermions but of tribimaximal type for the neutrinos in the first approximation.
It is shown that this can be implemented by allowing complex entries for the
mass matrix and spontaneous breakdown of the $S_3$ invariance of the
Lagrangian.


title: Color defects in a gauge condensate

abstract:
  The model of an approximate non-perturbative calculations in the SU(3) gauge
theory is offered. This approach is based on the separation of initial degrees
of freedom on ordered and disordered phases. The ordered phase is almost
classical degrees of freedom, the disordered phase is completely quantum
degrees of freedom. Using some approximations and simplifications for 2 and
4-points Green's functions an effective Lagrangian describing both phases from
the SU(3) Lagrangian is obtained. The calculations show that ordered phase is
squeezed by disordered phase into defects. These defects are: an infinite flux
tube filled with longitudinal color electric and magnetic fields; a color
electric hedgehog; a defect having either two color electric dipoles + two
color magnetic dipoles or two color electric dipoles or two color magnetic
dipoles. It assumed that the color defects are quantum excitations in a gauge
condensate. The equations for the disordered phase are an analog of Ginzburg -
Landau equation.


title: Renormalization in momentum dependent resummations

abstract:
  At finite temperature and in non-equilibrium environments we have to resum
perturbation theory to avoid infrared divergences. Since resummation shuffles
the perturbative orders, renormalizability is a nontrivial issue. In this paper
we demonstrate that one can modify any type of resummations -- even if it is
momentum dependent, or it resums higher point functions -- in a way that it is
renormalizable with the usual zero temperature counterterms. To achieve this
goal we reformulate resummation in form of a renormalization scheme. We apply
this technique to perform a 2PI resummation in the six dimensional cubic scalar
model in equilibrium.


title: gamma+gamma --> pi+pi, K+K : leading term QCD vs handbag model

abstract:
  The "handbag" model was proposed as an alternative, at the present day
energies, to the leading term QCD predictions for some hard exclusive
processes. The recent precise data from the Belle Collaboration on the large
angle cross sections $\gamma\gamma --> \pi\pi, KK $ allow a check of these two
approaches to be performed. It is shown that the handbag model fails to
describe the data from Belle, while the leading term QCD predictions are in
reasonable agreement with these data


title: Production of P-wave Charmed Mesons in Hadronic B Decays

abstract:
  Production of even-parity charmed mesons in hadronic B decays is studied.
Specifically, we focus on the Cabibbo-allowed decays $\bar B\to D^{**}\pi$ and
$\bar D^{**}_sD^{(*)}$, where $D^{**}$ denotes generically a p-wave charmed
meson. While the measured color-allowed decays $\bar B^0\to D^{**+}\pi^-$ are
consistent with the theoretical expectation, the experimental observation of
$B^-\to D^{**0}\pi^-$ for the broad $D^{**}$ states is astonishing as it
requires that the color-suppressed contribution dominates over the
color-allowed one, even though the former is $1/m_b$ suppressed in the heavy
quark limit. In order to accommodate the data of $\bar B\to D^{**}\pi^-$, it is
found that $a_2/a_1\approx -0.5$ with a sign opposite to that in $\bar B\to
D\pi$ decays, where $a_1$ and $a_2$ are the effective Wilson coefficients for
color-allowed and color-suppressed decay amplitudes, respectively. The decay
constants and form factors for $D^{**}$ and the Isgur-Wise functions
$\tau_{1/2}(\omega)$ and $\tau_{3/2}(\omega)$ are extracted from the data of
$B\to D^{**}\pi$ decays. The Isgur-Wise functions calculated in the covariant
light-front quark model are in good agreement with experiment. The neutral
modes $\bar B^0\to D^{**0}\pi^0$ for $D^{**}=D^*_0(2400),D'_1(2430)$ and $\bar
B^0\to D'^0_1(2430)\omega$ are predicted to have branching ratios of order
$10^{-4}$ which are also supported by isospin argument. The decay constants of
$D_{s0}^*(2317)$ and $D'_{s1}(2460)$ are inferred from the measurements of
$\bar B\to D_s^{**-}D$ to be $58\sim 86$ MeV and $130\sim 200$ MeV,
respectively. Contrary to the decay constants $f_{D_0^*}$ and $f_{D'_1}$ which
are similar in size, the large disparity between $f_{D_{s0}^*}$ and
$f_{D'_{s1}}$ is surprising and unexpected.


title:
Tribimaximal Neutrino Mixing and a Relation Between Neutrino- and
  Charged Lepton-Mass Spectra

abstract:
  Brannen has recently pointed out that the observed charged lepton masses
satisfy the relation m_e +m_\mu +m_\tau = {2/3}
(\sqrt{m_e}+\sqrt{m_\mu}+\sqrt{m_\tau})^2, while the observed neutrino masses
satisfy the relation m_{\nu 1} +m_{\nu 2} +m_{\nu 3} = {2/3} (-\sqrt{m_{\nu
1}}+\sqrt{m_{\nu 2}}+\sqrt{m_{\nu 3}})^2. It is discussed what neutrino Yukawa
interaction form is favorable if we take the fact pointed out by Brannen
seriously.


title:
On Transverse-Momentum Dependent Light-Cone Wave Functions of Light
  Mesons

abstract:
  Transverse-momentum dependent (TMD) light-cone wave functions of a light
meson are important ingredients in the TMD QCD factorization of exclusive
processes. This factorization allows one conveniently resum Sudakov logarithms
appearing in collinear factorization. The TMD light-cone wave functions are not
simply related to the standard light-cone wave functions in collinear
factorization by integrating them over the transverse momentum. We explore
relations between TMD light-cone wave functions and those in the collinear
factorization. Two factorized relations can be found. One is helpful for
constructing models for TMD light-cone wave functions, and the other can be
used for resummation. These relations will be useful to establish a link
between two types of factorization.


title: $B \to X_s l^+ l^-$ decay in a Top quark two-Higgs-doublet model

abstract:
  We calculate the new physics contributions to the rare semileptonic decay $B
\to X_s l^+ l^-$ $(l=e,\mu)$ induced by the charged-Higgs loop diagrams
appeared in the top quark two-Higgs doublet model (T2HDM). Within the
considered parameter space, we found that (a) the effective Wilson coefficients
$\widetilde{C}_{i}^{eff}(m_b)$ ($i =7\gamma, 9V$ and $10A$) in the T2HDM are
always standard model like; (b) the new physics contributions to
$\widetilde{C}_{7\gamma}^{eff}$ and $\widetilde{C}_{9V}^{eff}$ can be
significant, but they tend to cancel each other; and (c) the T2HDM predictions
for $Br(B \to X_s l^+ l^-)$ agree well with the measured value within one
standard deviation.


title:
One loop gluon form factor and freezing of alpha_s in the
  Gribov-Zwanziger QCD Lagrangian

abstract:
  We use the Gribov-Zwanziger Lagrangian in QCD to evaluate the one loop
correction to the gluon propagator as a function of the Gribov volume and
verify that the propagator vanishes in the infrared limit. Using the
corresponding correction to the Faddeev-Popov ghost propagator we construct the
renormalization group invariant coupling constant, alpha^eff_S(p^2), from the
gluon and ghost form factors and verify, using the Gribov mass gap condition,
that it freezes out at zero momentum to a non-zero value. This is qualitatively
consistent with other approaches. We also show that there is an enhancement of
the propagator of one of the Zwanziger ghosts at two loops similar to that
which occurs for the Faddeev-Popov ghosts. From the exact evaluation of the
form factors we examine power corrections for the gluon propagator and the
effective coupling. We find that both have the same qualitative behaviour in
that the leading power correction is O(1/p^2) and not O(1/(p^2)^2).


title: On the Decay Modes $\bar{B_{d,s}^0} \to \gamma D^{*0}$

abstract:
  The various decay modes of the type $B \to \gamma D^* $ are dynamically
different. In general there are factorizable contributions, and there are pole
diagrams and pseudoscalar exchange contributions at meson level. The purpose of
this paper is to point out that the decay modes $\bar{B_{d,s}^0} \to \gamma
D^{*0} $ have negligible contributions from such mechanisms, in contrast to the
decay modes $\bar{B_{d,s}^0} \to \gamma \bar{D^{*0}} $ and $B^- \to \gamma
D_{s,d}^{*-} $. However, for the decay modes $\bar{B_{d,s}^0} \to \gamma
D^{*0}$ there are non-factorizable contributions due to emision of soft gluons,
and such non-factorizable contributions are found to dominate the amplitudes
for these latter decay modes.
  We estimate the branching ratio for these modes in the heavy quark limits,
both for the $b$- and the $c$- quarks, and obtain a value $ \simeq 1.6 \times
10^{-6}$ for $\bar{B_{d}^0} \to \gamma D^{*0}$, and $ \simeq 8 \times 10^{-7}$
for $\bar{B_{s}^0} \to \gamma D^{*0}$. We expect large corrections to this
limit because the energy gap between the $b$- and $c$- quark masses are
significantly bigger than 1 GeV. However, we expect that our estimate for
$\bar{B_{d,s}^0} \to \gamma D^{*0}$ gives the right order of magnitude for the
{\em amplitudes}.


title: Monopole Decay in a Variable External Field

abstract:
  The rate of monopole decay into a dyon and an electron in an inhomogeneous
external electric field is calculated by semiclassical methods. Comparison is
made to an earlier result where this quantity was calculated for a constant
field. Experimental and cosmological tests are suggested.


title: Direct CP Violation in B+ to J/psi K+ Decay as Probe for New Physics

abstract:
  Currently there are New Physics hints in mixing-induced CP violation S(phi
K0), S(pi0 K0) < S(J/psi K0), unequal direct CP violation A(K+ pi-) differs
A(K+ pi0), and maybe even in measured S(J/psi K0) vs prediction from global fit
to other data. However, these hints either suffer from experimental
uncertainties, or uncertain hadronic corrections, and are not yet unequivocal.
Motivated by these hints, however, we point out that a unique probe may be
direct CP violation in B to J\psi K mode. An asymmetry observed at 1% or higher
would indicate New Physics.


title:
BCS/BEC crossover in Quark Matter and Evolution of its Static and
  Dynamic properties

abstract:
  We study the evolution of dynamic properties of the BCS/BEC (Bose-Einstein
Condensate) crossover in a relativistic superfluid as well as its
thermodynamics. We put particular focus on the change in the soft mode dynamics
throughout the crossover, and find that three different effective theories
describe it; these are, the time-dependent Ginzburg-Landau (TDGL) theory in the
BCS regime, the Gross-Pitaevskii (GP) theory in the BEC regime, and the
relativistic Gross-Pitaevskii (RGP) equation in the relativistic BEC (RBEC)
regime. Based on these effective theories, we discuss how the physical nature
of soft mode changes in the crossover. We also discuss some fluid-dynamic
aspects of the crossover using these effective theories with particular focus
on the shear viscosity. In addition to the study of soft modes, we show that
the ``quantum fluctuation'' is present in the relativistic fermion system,
which is in contrast to the usual Nozi`eres--Schmit-Rink (NSR) theory. We
clarify the physical meaning of the quantum fluctuation, and find that it
drastically increases the critical temperature in the weak coupling BCS regime.


title: Finite Temperature Effects and Axion Cosmology

abstract:
  We investigate the impact of finite temperature effects on axions in the
context of cosmology. The temperature dependence of the decay constant is
modeled analogous to pions. For the two interesting cases considered here, we
find that the temperature effects do lead to changes relevant for detailed and
precise abundance and rate calculations. We also find that the axion decoupling
temperature starts showing large deviations for larger values of the axion
decay constant.


title:
Two particle correlations inside one jet at "Modified Leading
  Logarithmic Approximation" of Quantum Chromodynamics; I: exact solution of
  the evolution equations at small x

abstract:
  We discuss correlations between two particles in jets at high energy
colliders and exactly solve the MLLA evolution equations in the small x limit.
We thus extend the Fong-Webber analysis to the region away from the hump of the
single inclusive energy spectrum. We give our results for LEP, Tevatron and LHC
energies, and compare with existing experimental data.


title:
A vertex-structure model for new direct CP-violating effects in
  Bbar^0(B^0) -> phi K_S and in B^-+ -> pi^-+ eta' (eta)

abstract:
  We consider effective Lagrangian models of CP-violating vertex structure in
which a $b -> uW$ vertex, proportional to $s_{13}e^{-i\delta_{13}}$ with
$s_{13}$ very small (milliweak interaction) and $\delta_{13}$ large, is
dynamically generated. A consequent, enhanced CP-violating vertex for $b\to sg$
results in an enhanced CP-violating phase in the ratio of amplitudes for $\bbar
\to \phi \KS$. We estimate that this can significantly change the $S$ parameter
from the value expected in the standard model.


title:
Production of black holes and their angular momentum distribution in
  models with split fermions

abstract:
  In models with TeV-scale gravity it is expected that mini black holes will be
produced in near-future accelerators. On the other hand, TeV-scale gravity is
plagued with many problems like fast proton decay, unacceptably large
neutron-antineutron oscillations, flavor changing neutral currents, large
mixing between leptons, etc. Most of these problems can be solved if different
fermions are localized at different points in the extra dimensions. We study
the cross-section for the production of black holes and their angular momentum
distribution in these models with "split" fermions. We find that, for a fixed
value of the fundamental mass scale, the total production cross section is
reduced compared with models where all the fermions are localized at the same
point in the extra dimensions. Fermion splitting also implies that the bulk
component of the black hole angular momentum must be taken into account in
studies of the black hole decay via Hawking radiation.


title: Probing low-x QCD with cosmic neutrinos at the Pierre Auger Observatory

abstract:
  The sources of the observed ultra-high energy cosmic rays must also generate
ultra-high energy neutrinos. Deep inelastic scattering of these neutrinos with
nucleons on Earth probe center-of-mass energies $\sqrt{s} \sim 100$ TeV, well
beyond those attainable at terrestrial colliders. By comparing the rates for
two classes of observable events, any departure from the benchmark (unscreened
perturbative QCD) neutrino-nucleon cross-section can be constrained. Using the
projected sensitivity of the Pierre Auger Observatory to quasi-horizontal
showers and Earth-skimming tau neutrinos, we show that a `Super-Auger' detector
can thus provide an unique probe of strong interaction dynamics.


title: Limiting fragmentation in hadron-hadron collisions at high energies

abstract:
  Limiting fragmentation in proton-proton, deuteron-nucleus and nucleus-nucleus
collisions is analyzed in the framework of the Balitsky-Kovchegov equation in
high energy QCD. Good agreement with experimental data is obtained for a wide
range of energies. Further detailed tests of limiting fragmentation at RHIC and
the LHC will provide insight into the evolution equations for high energy QCD.


title: Leptogenesis in Realistic SO(10) Models

abstract:
  We study the origin of baryonic matter via leptogenesis in realistic SO(10)
models, in particular, in a new lopsided mass matrix model introduced recently
by three of the authors. By introducing simple CP-violating phases in the mass
matrix of the right-handed neutrinos, the model generates sufficient baryon
asymmetry without fine-tuning. We compare this result with other realistic
SO(10) models.


title: Schematic model of generations

abstract:
  We propose a model of generations that has exactly three generations. This
model has several attractive features: There is a simple mechanism to produce
the CKM quark mixings and their neutrino analogs. There are definite
predictions for particles of much higher mass than the quarks and leptons of
the standard model, including the prediction of two-body decays without missing
mass for the higher mass particles. There is a natural dark matter particle. A
discussion of masses of the quarks suggests that the large mass differences
between the generations could have a qualitative explanation, and there could
be a simple way to make the $u$-$d$ mass difference negative, but the $c$-$s$
and $t$-$b$ mass differences positive. The model also suggests a completely new
scenario for the production, mass and decays of the Higgs meson that will be
analysed in a separate paper.


title: Color Skyrmions in the Quark-Gluon Plasma

abstract:
  We consider the general formulation of nonabelian fluid dynamics based on
symmetry considerations. We point out that, quite generally, this admits
solitonic excitations which are the color analog of skyrmions. Some general
properties of the solitons are discussed.


title: Moduli/Inflaton Mixing with Supersymmetry Breaking Field

abstract:
  A heavy scalar field such as moduli or an inflaton generally mixes with a
field responsible for the supersymmetry breaking. We study the scalar decay
into the standard model particles and their superpartners, gravitinos, and the
supersymmetry breaking sector, particularly paying attention to decay modes
that proceed via the mixing between the scalar and the supersymmetry breaking
field. The impacts of the new decay processes on cosmological scenarios are
also discussed; the modulus field generically produces too much gravitinos, and
most of the inflation models tend to result in too high reheating temperature
and/or gravitino overproduction.


title:
Phase space and quark mass effects in neutrino emissions in a color
  superconductor

abstract:
  We study the phase space for neutrino emissions with massive quarks in direct
Urca processes in normal and color superconducting quark matter. We derive in
QCD and the NJL model the Fermi momentum reduction resulting from Fermi liquid
properties which opens up the phase space for neutrino emissions. The relation
between the Fermi momentum and chemical potential is found to be
$p_{F}\approx\mu(1-\kappa)$ with $\kappa$ depending on coupling constants. We
find in the weak coupling regime that $\kappa$ is a monotonously increasing
function of the chemical potential. This implies quenched phase space for
neutrino emissions at low baryon densities. We calculate neutrino emissivities
with massive quarks in a spin-one color superconductor. The quark mass
corrections are found to be of the same order as the contributions in the
massless case, which will bring sizable effects on the cooling behavior of
compact stars.


title: QCD condensates with flavor SU(3) symmetry breaking

abstract:
  We investigate the effects of flavor SU(3)-symmetry breaking on the QCD
condensates, based on the nonlocal effective chiral action from the instanton
vacuum, focusing on the quark-gluon mixed one. We employ two different
parameterizations for the dependence of the momentum-dependent dynamical quark
mass on the strange current quark mass. We obtain the ratios of the mixed
condensates:$[<\bar{s}\sigma_{\mu\nu}G^{\mu\nu}s><\bar{u}\sig
ma_{\mu\nu}G^{\mu\nu}u>]^{1/5}=0.87$. It turns out that the dimensional
parameter $m^2_0=<\bar{q} \sigma_{\mu\nu}G^{\mu\nu}q>/ <\bar{q}q> =1.60\sim
1.92 {\rm GeV}^2$.


title: New physics in $B \to \pi \pi$ and $B \to \pi K$ decays

abstract:
  We perform a combined analysis of $B \to \pi \pi$ and $B \to \pi K$ decays
with the current experimental data. Assuming SU(3) flavor symmetry and no new
physics contributions to the topological amplitudes, we demonstrate that the
conventional parametrization in the Standard Model (SM) does not describe the
data very well, in contrast with a similar analysis based on the earlier data.
It is also shown that the introduction of smaller amplitudes and reasonable
SU(3) breaking parameters does not improve the fits much. Interpreting these
puzzling behaviors in the SM as a new physics (NP) signal, we study various NP
scenarios. We find that when a single NP amplitude dominates, the NP in the
electroweak penguin sector is the most favorable. However, other NP solutions,
such as NP residing in the QCD-penguin sector and color-suppressed electroweak
penguin sector simultaneously, can also solve the puzzle.


title: Scalar K pi form factor and light quark masses

abstract:
  Recent experimental improvements on K-decay data allow for a precise
extraction of the strangeness-changing scalar K pi form factor and the related
strange scalar spectral function. On the basis of this scalar as well as the
corresponding pseudoscalar spectral function, the strange quark mass is
determined to be m_s(2 GeV) = 92 +- 9 MeV. Further taking into account chiral
perturbation theory mass ratios, the light up and down quark masses turn out to
be m_u(2 GeV) = 2.7 +- 0.4 MeV as well as m_d(2 GeV) = 4.8 +- 0.5 MeV. As a
by-product, we also find a value for the Cabibbo angle |V_{us}| = 0.2236(29)
and the ratio of meson decay constants F_K/F_\pi = 1.203(16). Performing a
global average of the strange mass by including extractions from other channels
as well as lattice QCD results yields m_s(2 GeV) = 94 +- 6 MeV.


title: Spectral distribution for the decay tau -> nu_tau K pi

abstract:
  With the newly available data sets on hadronic tau decays from the
B-factories BABAR and BELLE, and future data from BESIII, precise information
on the decay distributions will soon become available. This calls for an
improvement of the decay spectra also on the theoretical side. In this work,
the distribution function for the decay tau -> nu_tau K pi will be presented
with the relevant K pi vector and scalar form factors being calculated in the
framework of the resonance chiral theory, also taking into account additional
constraints from dispersion relations and short-distances. As a by-product the
slope and curvature of the vector form factor F_+^{K pi}(s) are determined to
be lambda_+^' = 25.6 10^{-3} and lambda_+^{''} = 1.31 10^{-3} respectively.
  From our approach it appears that it should be possible to obtain information
on the low lying scalar K_0^*(800) as well as the second vector K^*(1410)
resonances from the tau decay data. In particular, the exclusive branching
fraction of the scalar component is found to be B[tau -> nu_tau(K pi)_{S-wave}]
= (3.88 +- 0.19) 10^{-4}.


title: Two-body non-leptonic decays of lambda_b

abstract:
  Two body non-leptonic decays: are investigated. Baryon form factors of the
heavy quark effective theory are employed. Form factors for renormalization in
full QCD are also considered. We find that contributions of the
non-factorizable terms are negligible in b-decays. Comparison with calculations
in other models shows that form factors for renormalization in full QCD should
be more relevant. The asymmetry parameters are negative as in the charmed
baryons cases. An experimental measure on the form factors V1 and A1 is
accentuated to test the validity of HQET.


title:
Bounds for $Z^\prime$ Mass in 3-3-1 Models from $e^+$ $e^-$ Collisions
  at ILC and CLIC Energies

abstract:
  We obtain bounds for the mass of the extra neutral gauge boson, ${Z^\prime}$,
predicted by two versions of ${SU (3)_C \times SU (3)_L \times U (1)_X}$ model,
namely one corresponding to its minimal version and another where the neutrinos
are allowed to have right-handed projection. We explore $\sqrt s$ from 0.5 TeV
to 5 TeV region, that will be accessible in next linear colliders (ILC and
CLIC). We used the process $e^+ + e^- \longrightarrow f^+ + f^-$, with $f=\mu$,
$c$ and $b$ to obtain the energy dependent lower bounds for $M_{Z^\prime}$,
within 95% C.L., by performing a $\chi ^{2}$ fit of the difference between the
final lepton angular distribution calculated from the SM and that predicted by
the 3-3-1 models, for a zero mixing angle. In addition we show that, as the
angular distributions depends on $Z^\prime$ couplings, the obtained bounds
allow one for disentangle the studied models. Finally, using the model with
right-handed neutrinos, we calculate the total cross section for $e^+ + e^-
\longrightarrow e^+ + e^- + e^+ + e^-$. We concluded that $Z^\prime$
contribution is very small when compared with the bilepton contribution of the
minimal version and with the SM cross section.


title: Spin dependent elastic antiproton interactions

abstract:
  Relativistic formulae for spin averaged and spin dependent one photon
exchange differential cross sections are developed for spin half fermion
fermion elastic scattering. Spin transfer cross sections are important for the
Polarized Antiproton eXperiments (PAX) project at GSI Darmstadt. In particular,
cross sections for polarization transfer in antiproton electron and antiproton
proton elastic collisions are presented.


title:
Lepton distribution as a probe of new physics in production and decay of
  the t quark and its polarization

abstract:
  We investigate the possibilities of studying new physics in various processes
of t-quark production using kinematical distributions of the secondary lepton
coming from decay of t quarks. We show that the angular distributions of the
secondary lepton are insensitive to the anomalous tbW vertex and hence are pure
probes of new physics in a generic process of t-quark production. The energy
distribution of the lepton is distinctly affected by anomalous tbW couplings
and can be used to analyze them independent of the production process of t
quarks. The effects of t polarization on the distributions of the decay lepton
are demonstrated for top-pair production process at a gamma-gamma collider
mediated by a heavy Higgs boson.


title: Solving Degeneracies at a $\beta$-Beam by Combining Ions

abstract:
  We study how the eightfold-degeneracy in the ($\theta_{13},\delta$) plane
observed in $\gamma \sim 100$ $\beta$-beams can be reduced by periodically
changing the ions in the storage ring. This ``ions cocktail'' allows to change
the neutrino energy, at fixed $\gamma$, by choosing ions with different decay
energies. We propose to combine the standard $^6$He and $^{18}$Ne beams with
$^8$Li and $^8$B ones. These latter two ions have peaked $\nu_e \to \nu_\mu$
oscillation probabilities for $\gamma = 100$ at a baseline $L \sim 700$ Km. At
this distance and this $\gamma$ the oscillation probability of $^6$He and
$^{18}$Ne neutrinos is at its second maximum. This setup is particularly suited
for large enough values of $\theta_{13}$ (within reach at T2K-I) and it allows
solving most of the eightfold-degeneracy, measuring $\theta_{13}, \delta$ and
the sign of the atmospheric mass difference for values of $\theta_{13} \geq
5^\circ$.


title:
Comment on "Parity Doubling and SU(2)_L X SU(2)_R Restoration in the
  Hadronic Spectrum" and "Parity Doubling Among the Baryons"

abstract:
  Some aspects of two recent papers on parity doubling in the hadronic spectrum
and its relation to restoration of linearly realized chiral symmetry are
critically discussed.


title:
Hadronic production of the heavy gauge bosons ($Z_{H}$, $B_{H}$,
  $W_{H}^{\pm}$) associated with one QCD jet

abstract: This paper has been withdrawn by the author, due some mistakes in this paper.


title: Nonstandard Higgs in Electroweak Chiral Lagrangian

abstract:
  We add a nonstandard higgs into the traditional bosonic part of electroweak
chiral Lagrangian, in purpose of finding out the contribution to EWCL
coefficients from processes with internal line higgs particle. To construct the
effective Lagrangian with higgs, we use low energy expansion scheme and write
down all the independent terms conserving $SU(2)\times U_Y(1)$ symmetry in the
nonlinear representation which we show is equivalent to the linear
representation. Then we integrate out higgs using loop expansion technique at
1-loop level, contributions from all possible terms are obtained. We find three
terms, $\mathcal{L}_5$, $\mathcal{L}_7$, $\mathcal{L}_{10}$ in EWCL are
important, for which the contributions from higgs can be further expressed in
terms of higgs partial decay width $\Gamma_{h\to ZZ}$ and $\Gamma_{h\to WW}$.
Higg mass dependence of the coefficients in EWCL are discussed.


title: Scalar kappa meson in K* photoproduction

abstract:
  We propose that the scalar $\kappa(800)$ meson may play an important role in
$K^*$ photoproduction. In the reactions of $\gamma p \to K^{*+} \Lambda$ and
$\gamma p \to K^{*0} \Sigma^+$, we consider the production mechanisms including
$t$-channel $K^*$, $K$, $\kappa$ exchanges, s-channel $N$, $\Delta$ diagrams,
and $u$-channel $\Lambda$, $\Sigma$, $\Sigma^*$ diagrams within the tree level
approximation, and find that the $\kappa$-meson exchange may contribute
significantly to $K^*\Sigma$ photoproduction, while it is rather supplementary
in $K^*\Lambda$ photoproduction. We demonstrate how the observables of $K^*$
photoproduction can be used to constrain the $\kappa$ meson properties. In
particular, the parity asymmetry can separate the $\kappa$ meson contribution
in $K^*$ photoproduction.


title:
Applying Rule Ensembles to the Search for Super-Symmetry at the Large
  Hadron Collider

abstract:
  In this note we give an example application of a recently presented
predictive learning method called Rule Ensembles. The application we present is
the search for super-symmetric particles at the Large Hadron Collider. In
particular, we consider the problem of separating the background coming from
top quark production from the signal of super-symmetric particles. The method
is based on an expansion of base learners, each learner being a rule, i.e. a
combination of cuts in the variable space describing signal and background.
These rules are generated from an ensemble of decision trees. One of the
results of the method is a set of rules (cuts) ordered according to their
importance, which gives useful tools for diagnosis of the model. We also
compare the method to a number of other multivariate methods, in particular
Artificial Neural Networks, the likelihood method and the recently presented
boosted decision tree method. We find better performance of Rule Ensembles in
all cases. For example for a given significance the amount of data needed to
claim SUSY discovery could be reduced by 15 % using Rule Ensembles as compared
to using a likelihood method.


title: Monopole confinement by flux tube

abstract:
  We revisit Nambu's model of quark confinement by a tube of magnetic flux,
with two additional features. The quarks are taken to be magnetic monopoles
external to the tube, which seal the ends, and are also taken to be fermions.
This ensures that the model is inconsistent unless there are at least two
species of fermions being confined.


title:
Single top production in the $t$-channel at LHC: a realistic test of
  electroweak models

abstract:
  We compute the complete electroweak one-loop effect on the process of
$t$-channel single top production at LHC in the Standard Model and in the MSSM
within the mSUGRA symmetry breaking scheme. We find that the one-loop
electroweak SM effect is large, and decreases the cross section of an amount
that is of the same size as that of the NLO QCD one. The genuine SUSY effect in
the mSUGRA scheme, for a general choice of benchmark points, is rather small.
It might become large and visible in more general scenarios around thresholds
involving light stop and neutralino mass values.


title:
Bilarge neutrino mixing in R-parity violating supersymmetry: the role of
  right-chiral neutrino superfields

abstract:
  We consider the possibility of neutrino mass generation in a supersymmetric
model where lepton number can be violated by odd units. The different patterns
of mixing in the quark and lepton sectors are attributed to the persence of
right-chiral neutrino superfields which (a) enter into Yukawa couplings via
non-renormalizable interaction with hidden sector fields, and (b) can violate
lepton number by odd units. Both of these features are shown to be the result
of some global quantum number which is violated when SUSY is broken in the
hidden sector. It is shown how such a scenario, together with all known
R-parity violating effects, can lead to neutrino masses and bilarge mixing via
seesaw as well as radiative mechanisms. Some sample values of the various
parameters involved, consistent with electroweak symmetry breaking constraints,
are presented as illustrations.


title:
Mechanisms of proton-proton inelastic cross-section growth in
  multi-peripheral model within the framework of perturbation theory. Part 1

abstract:
  We demonstrate a possibility of computation of inelastic scattering
cross-section in a multi-peripheral model by application of the Laplace method
to multidimensional integral over the domain of physical process. The
constrained maximum point of scattering cross-section integral under condition
of the energy-momentum conservation has been found. In the vicinity of this
point the integrand is substituted for an expression of Gaussian type, which
made possible to compute this integral numerically. The paper has two parts.
The hunting procedure of the constrained maximum point is considered and the
properties of this maximum point are discussed in the given part of the paper.
It is shown that virtuality of all internal lines of the "comb" diagram reduced
at the constrained maximum point with energy growth. In the second part of the
paper we give some arguments in favor of consideration of the mechanism of
virtuality reduction as the mechanism of the total hadron scattering
cross-section growth, which is not taken into account within the framework of
Regge theory.


title: The dark(er) side of inflation

abstract:
  We present a new approach to quintessential inflation, in which both dark
energy and inflation are explained by the evolution of a single scalar field.
We start from a simple scalar potential with both oscillatory and exponential
behavior.We employ the conventional reheating mechanism of new inflation, in
which the scalar decays to light fermions with a decay width that is
proportional to the scalar mass. Because our scalar mass is proportional to the
Hubble rate, this gives adequate reheating at early times while shutting off at
late times to preserve quintessence and satisfy nucleosynthesis constraints.


title: Uncertainty in the leading order PQCD calculations of $B$ meson decays

abstract:
  Uncertainty in the PQCD calculation of B decays is investigated in $B\to
\pi$, $B\to D$ transition form factors and $B\to D\pi$ decay amplitudes. $B$
meson distributionamplitude dependence is studied by taking three kinds of
distribution amplitude so far suggested. It is found that almost same $q^2$
dependence of the form factors can be obtained irrespective of the types of the
$B$ meson distribution amplitude by suitably choosing one parameter. $B\to
D\pi$ process shows the difference due to the distribution amplitude. The
effect of the sub-leading component of the $B$ mesondistribution amplitude is
also studied in the three processes. The numerical results of calculations with
the sub-leading component can be well approximated by the leading order
calculation with a suitable choice of the distribution amplitude parameters.


title:
Central jet production as a probe of the perturbative formalism for
  exclusive diffraction

abstract:
  We propose a new variable, R_j, in order to identify exclusive
double-diffractive high E_T dijet production. The variable R_j is calculated
using the transverse energy E_T and pseudorapidity of the jet with the largest
E_T. For a purely exclusive event the value of R_j -> 1, if we were to neglect
hadronisaton and the detector resolution effects. To illustrate the expected
R_j-distribution we also compute exclusive three-jet production; and, moreover,
include jet smearing effects. By studying the predictions as a function of the
size of the rapidity interval, delta(eta), which allows for additional gluon
radiation, one can probe the QCD radiation effects which are responsible for
the Sudakov suppression of the exclusive amplitude. In this way we may check,
and improve, the formalism used to predict the cross sections of exclusive
double-diffractive Higgs boson (and/or other New Physics) production.


title: Neutrino propagation in magnetized plasma

abstract:
  The process of neutrino propagation through an active medium consisting of
magnetic field and plasma is analysed. We consider in detail the contribution
of a magnetic field B into the neutrino self-energy operator Sigma (p). The
results for this contribution were contradictory in the previous literature.
For the conditions of the early universe where the background medium consists
of a charge-symmetric plasma, the pure B-field contribution to the neutrino
dispersion relation is proportional to (e B)^2 and thus comparable to the
contribution of the magnetized plasma. The neutrino self-energy operator Sigma
(p) is calculated also for the case of high-energy neutrinos, which corresponds
to the crossed field approximation. The probability of the neutrino decay nu to
e^- W^+ is calculated from the imaginary part of the Sigma (p) operator. A
simple analytical result is obtained for the most interesting region of
parameters which was not considered earlier. The external magnetic field
contribution into the neutrino magnetic moment is calculated. The result
obtained corrects the formulas existed earlier. We show qualitatively that the
effect of ``neutrino spin light'' discussed in the literature has no physical
region of realization because of the medium influence on photon dispersion.


title: On 't Hooft's representation of the \beta-function

abstract:
  It is demonstrated, that 't Hooft's renormalization scheme (in which
\beta-function has exactly the two-loop form) is generally in conflict with the
natural physical requirements and specifies the type of the field theory in an
arbitrary manner. It violates analytic properties in the coupling constant
plane and provokes misleading conclusion on accumulation of singularities near
the origin. It artificially creates renormalon singularities, even if they are
absent in the physical scheme. The 't Hooft scheme can be used in the framework
of perturbation theory but no global conclusions should be drawn from it.


title: Holographic Wave Functions, Meromorphization and Counting Rules

abstract:
  We study the large-Q^2 behavior of the meson form factor F_M (Q^2)
constructed using the holographic light-front wave functions proposed recently
by Brodsky and de Teramond. We show that this model can be also obtained within
the Migdal's regularization approach (``meromorphization''), if one applies it
to 3-point function for scalar currents made of scalar quarks. We found that
the asymptotic 1/Q^2 behavior of F_M (Q^2) is generated by soft Feynman
mechanism rather than by short distance dynamics, which causes very late onset
of the 1/Q^2 asymptotic behavior. Using meromorphization for spin-1/2 quarks,
we demonstrated that resulting form factor F^{spinor}_M (Q^2) has 1/Q^4
asymptotic behavior. Now, owing to the late onset of this asymptotic pattern,
  F^{spinor}_M (Q^2) imitates the 1/Q^2 behavior in the few GeV^2 region.
  We discuss analogy between meromorphization and local quark-hadron duality
model for the pion form factor, and show that adding the O(\alpha_s) correction
to the spectral function brings in the hard pQCD contribution that has the
dimensional counting $1/Q^2$ behavior at large Q^2. At accessible Q^2, the
O(\alpha_s) term is a rather small fraction of the total result. We conclude
that the ``observed'' quark counting rules for hadronic form factors is an
approximate phenomenon resulting from Feynman mechanism in its preasymptotic
regime.


title: Higgs + 2 Jets as a Probe for CP Properties

abstract:
  Azimuthal angle correlations of the jets in Hjj events at the LHC provide a
probe of the CP nature of Higgs couplings to gauge bosons. In weak boson fusion
the HWW and HZZ couplings are tested. Gluon fusion processes probe the tensor
structure of the effective Hgg vertex and thus the CP nature of the dominant
quark couplings.


title: The Excited Scalars of the Universal Extra Dimension Model

abstract:
  In the minimal Universal Extra Dimension (mUED) model, there are four
physical scalar particles at the n=1 level, two charged and two neutral. Due to
the almost degenerate nature of the spectrum, the detection of these scalars is
a major challenge, perhaps the greatest experimental challenge if UED-type new
physics is observed at the Large Hadron Collider (LHC). We explore the
possibility of detecting these particles at the International Linear Collider
(ILC), and emphasise the need of having an excellent soft tau detection
efficiency.


title: Search for Low-Scale Technicolor at the Tevatron

abstract:
  CDF and D0 each have more than 1 inverse femtobarn of data on tape, and their
stores are increasing. This should be sufficient to carry out significant
searches for low-scale technicolor in rho_T --> W pi_T and omega_T, rho_T -->
gamma pi_T, processes whose cross sections may be as large as several
picobarns. In this note we motivate and describe the Technicolor Straw Man
framework for these processes and we urge that they be sought soon in the Run 2
data. (This paper is a contribution to the TeV4LHC Landscapes project.)


title: Direct Detection of Supersymmetric Particles in Neutrino Telescopes

abstract:
  In supersymmetric theories where the lightest supersymmetric particle is the
gravitino the next to lightest supersymmetric particle is typically a long
lived charged slepton. In this paper, following our earlier proposal, we
perform a detailed study of the production of pairs of these particles induced
by the interactions of high energy cosmic neutrinos with nucleons in the earth,
their propagation through the earth and finally their detection in neutrino
telescopes. We investigate the charged slepton energy loss in detail and
establish that the relatively small cross-section for the production of
supersymmetric particles is partially compensated for by the very long range of
these heavy particles. The signal, consisting of two parallel charged tracks
emerging from the earth, is characterized by a track separation of a few
hundred meters. We perform a careful analysis of the main background, coming
from direct di-muon production, and show that it can be separated from the
signal due to its characteristically smaller track separation. We conclude that
neutrino telescopes will complement collider searches in the determination of
the supersymmetry breaking scale, and may even provide the first evidence for
supersymmetry at the weak scale.


title:
Dynamical realization of democratic Yukawa matrices and alignment of
  A-terms

abstract:
  We study realization of the democratic form of Yukawa matrices by infrared
fixed points. We investigate renormalization-group flows of Yukawa couplings in
models with a single Yukawa matrix for three families, and up and down-sector
Yukawa matrices. It is found that each model has its certain pattern of
renormalization-group flows of Yukawa matrices. We apply them to the charged
lepton sector and quark sector, and show that realistic results for the second
and third families are obtained with natural initial conditions, e.g.
$(V_{MNS})_{23} \sim 2/\sqrt{6}$, $m_s/m_b \sim V_{cb} \sim m_{\mu}/m_\tau$ and
$m_c/m_t \sim (m_s/m_b)^{3/2}$. We also study corresponding A-terms. The
A-terms approach toward the universal form with no physical CP-violating phase.
Thus, constraints due to various neutral flavor changing processes except for
$\mu \to e \gamma$ are found to be satisfied by this dynamics. In order to
suppress the electric dipole moments as well as $\mu \to e \gamma$
sufficiently, more alignment of the A-terms with some reason is required.


title: Earth Matter Effects in Detection of Supernova Neutrinos

abstract:
  We calculated the matter effect, including both the Earth and supernova, on
the detection of neutrinos from type II supernovae at the proposed Daya Bay
reactor neutrino experiment. It is found that apart from the dependence on the
flip probability P_H inside the supernova and the mass hierarchy of neutrinos,
the amount of the Earth matter effect depends on the direction of the incoming
supernova neutrinos, and reaches the biggest value when the incident angle of
neutrinos is around 93^\circ. In the reaction channel \bar{\nu}_e + p --> e^+ +
n the Earth matter effect can be as big as about 12%. For other detection
processes the amount of the Earth matter effect is a few per cent.


title: CP Violation in Supersymmetric Theories: stop2 -> stop1 tau- tau+

abstract:
  Supersymmetric (SUSY) theories include many new parameters, some of which are
CP-violating. Assuming that SUSY is found at a future high-energy collider, we
examine the decay stop2 -> stop1 tau- tau+ with an eye to obtaining information
about the new CP phases. We show that there are two CP-violating asymmetries
which can be large in some regions of the SUSY parameter space. These involve
measuring one or both of the tau spins. These asymmetries are particularly
sensitive to phi_At, the phase of the trilinear coupling A_t.


title:
Neutrino Mass Squared Differences in the Exact Solution of a 3-3-1 Gauge
  Model without Exotic Electric Charges

abstract:
  The mass splittings for the Majorana neutrinos in the exact solution of a
particular 3-3-1 gauge model are computed here in detail. Since both
$\sin^{2}\theta_{13}\simeq0$ and the mass splittings ratio
$r_{\Delta}\simeq0.033$ are taken into account, the analytical calculations
seem to predict an inverted mass hierarchy and a mixing matrix with a texture
based on a very close approximation to the bi-maximal mixing. The resulting
formulas for the mass squared differences can naturally accomodate the
available data if the unique free parameter ($a$) gets very small values
($\sim10^{-15}$). Consequently, the smallness of the parameter requires
(according to our method) a large breaking scale $<\phi>\sim10^{6}-10^{7}$ TeV
in the model. Hence, the results concerning the neutrino mass splittings may
lead to a more precise tuning in the exact solution of the 3-3-1 model of
interest, being able - at the same time - to recover all the Standard Model
phenomenology and predict the mass spectrum of the new gauge bosons
$Z^{\prime},X,Y$ in accordance with the actual data. The minimal absolute mass
in the neutrino sector is also obtained - $m_{0}\simeq0.0035$ eV - in the case
of our suitable approximation for the bi-maxcimal mixing.


title: Why multi-jet studies?

abstract:
  We review the status of non-perturbative analyses of multi-jet event shape
distributions and mean values, highlighting the physical insight on QCD
dynamics they can provide.


title: Light Scalar Mesons from Phi to Psi

abstract:
  The following topics are considered. 1) Confinement, chiral dynamics, and
light scalar mesons. 2) Chiral shielding of the $\sigma(600)$. 3) The $\phi$
meson radiative decays about nature of light scalar resonances. 4) The $J/\psi$
decays about nature of light scalar resonances. 5) The
$a_0(980)\to\gamma\gamma$ and $f_0(980)\to\gamma\gamma$ decays about nature of
light scalar resonances. 6) New round in $\gamma\gamma\to\pi^+\pi^-$, the Belle
data. Arguments in favor of the four-quark model of the $a_0(980)$ and
$f_0(980)$ mesons are given.


title: ppbar enhancement in B and J/Psi decay

abstract:
  The near-threshold enhancement in the ppbar invariant mass spectrum from the
B^+ -> K^+ ppbar decay reported recently by the BaBar Collaboration is studied
within the J\"ulich NNbar model. We illustrate that the invariant mass
dependence of the ppbar spectrum close to the threshold can be reproduced by
the final state interactions. This explanation is in line with our previous
analysis of the ppbar invariant mass spectrum from the J/Psi -> gamma ppbar
decay measured by the BES Collaboration. We also comment on a structure found
recently in the pi^+ pi^- eta' mass spectrum of the radiative J/Psi decay by
the BES Collaboration. In particular we argue that one should be rather
cautions in bringing this structure in connection with the enhancement found in
the ppbar invariant mass spectrum or with the existence of NNbar bound states.


title: Nuclear Attenuation of high energy two-hadron system in the string model

abstract:
  Nuclear attenuation of the two-hadron system is considered in the string
model. The two-scale model and its improved version with two different choices
of constituent formation time and sets of parameters obtained earlier for the
single hadron attenuation, are used to describe available experimental data for
the $z$-dependence of subleading hadron, whereas satisfactory agreement with
the experimental data has been observed. A model prediction for
$\nu$-dependence of the nuclear attenuation of the two-hadron system is also
presented.


title:
Feasibility study for a model independent measurement of 2$\beta +
  \gamma$ in $B^0$ decays using $D^- K^0 \pi^+$ final states

abstract:
  In this paper we present a feasibility study for measuring the combination of
the Unitarity Triangle angle 2$\beta +\gamma$ with a time dependent Dalitz
analysis in $B^0$ decays using $D^- K^0 \pi^+$ final states following the
method proposed in [1]. For this study we build a model for this decay using
the latest experimental information and we investigate the possibility of
fitting together with 2$\beta +\gamma$ all the relevant strong amplitudes and
phases of the decay model.
  [1] R. Aleksan, T.C. Petersen and A. Soffer, Phys. Rev. D67 (2003) 096002
[hep-ph/0209194].


title: What the NA60 dilepton data can tell

abstract:
  The NA60 experiment has studied low-mass muon pair production in In-In
collisions at 158 AGeV with unprecedented precision. Thus, there is hope that
the in-medium modifications of the vector meson spectral function can be
constrained more thoroughly than from previous experiments. Towards this goal,
we present a study comparing different models for the in-medium modification of
vector mesons. In particular, we investigate what can be learned about
collisional broadening by a medium at finite temperature and baryon density and
what model independent constraints can be obtained from the data. Of special
relevance is a comparison to $p_T$-cuts of the dilepton spectra. Those not only
provide independent tests of the evolution model and $p_T$-dependence of the
spectral function but also unambiguously decide if the observed yield in the
higher mass spectrum $M > 1 {\rm GeV}$ is mainly due to the hot phase of the
evolution or four pion annihilation processes.


title: Calculation of the pentaquark width by QCD sum rule

abstract:
  The pentaquark width is calculated in QCD sum rules. Result for
$\Gamma_{\Theta}$ show, that $\Gamma_{\Theta}$ can vary in the region less than
1$MeV$. The main conclusion is, that if pentaquark is genuine states then sum
rules really predict the narrow width of pentaquark $\theta^+$, and the
suppression of the width is both parametrical and numerical.


title: A Monochromatic Neutrino Beam for U(e3) and CP-Phase

abstract:
  The goal for future neutrino facilities is the determination of the
$[U_{e3}]$ mixing and CP violation in neutrino oscillations. This will require
precision experiments with a very intense neutrino source. Here a novel method
to create a monochromatic neutrino beam based on the recent discovery of nuclei
that decay fast through electron capture is discussed. The boost of such
radioactive ions will generate a monochromatic directional neutrino beam when
decaying at high energy in a storage ring with long straight sections. We show
that the capacity of such a facility to discover new physics is impressive, so
that the principle of energy dependence in the oscillation probability of the
$\nu_e \to \nu_{\mu}$ channel is operational to separate out the two parameters
of the mixing $\theta_{13}$ and of the CP-violating phase $\delta$.


title: Singlet structure function g_1 at small x and small Q^2

abstract:
  Explicit expressions for the singlet g_1 at small x and small Q^2 are
obtained with the total resummation of the leading logarithmic contributions.
It is shown that g_1 practically does not depend on Q^2 in this kinematic
region. In contrast, it would be interesting to investigate its dependence on
the invariant energy 2pq because, being g_1 positive at small 2pq, it can turn
negative at greater values of this variable. The position of the turning point
is sensitive to the ratio between the initial quark and gluon densities, so its
experimental detection would enable to estimate this ratio


title: Hadronic Charm Decays and D Mixing

abstract:
  I discuss new results on absolute branching ratios of charm mesons into
specific exclusive final states, Cabibbo suppressed decay rates, inclusive
decays to $s\bar{s}$ mesons, limits on D^0 anti-D^0 mixing, CP violation and T
violation. Preliminary results from CLEO-c now dominate the world average
absolute branching fractions. For the most important normalization modes
involving D^0 and D^+, the averages are B(D^0 -> K^- pi^+ = (3.87 +/- 0.06)%,
and B(D^+ -> K^- pi^+ pi^+)= (9.12 +/- 0.19)%. For the Ds^+ CLEO-c measures
B(Ds+ -> K^- K^+ pi^+)=(4.54^{+0.44}_{-0.42} =/- 0.25)%. Using this rate, I
derive an effective branching ratio B(eff)(Ds^+ -> phi pi^+)=(3.49 +/- 0.39)%,
that is appropriate for use in extracting other branching fractions that have
often been measured relative to this mode. This number is compared with other
determinations.


title:
Partial decay widths of baryons in the spin-momentum operator expansion
  method

abstract:
  The cross sections for photo- and pion-induced production of baryon
resonances and their partial decay widths to the two--body and multi--body
final states are calculated in the framework of the operator expansion method.
The approach is fully relativistic invariant, and it allows us to perform
combined analyses of different reactions imposing directly the analyticity and
unitarity constraints. All formulae are given explicitly in the form used by
the Crystal Barrel collaboration in the partial wave analysis.


title: Lepton Flavor Violating tau and muon decays

abstract:
  In this work the following lepton flavor violating $\tau$ and $\mu$ decays
are studied: $\tau^- \to \mu^- \mu^- \mu^+$, $\tau^- \to e^- e^- e^+$, $\mu^-
\to e^- e^- e^+$, $\tau^- \to \mu^- \gamma$, $\tau^- \to e^- \gamma$ and $\mu^-
\to e^- \gamma$. We work in a constrained supersymmetric scenario with
universal soft breaking terms and where the MSSM particle content is extended
by the addition of three heavy right handed Majorana neutrinos and their
supersymmetric partners. The generation of neutrino masses is done via the
seesaw mechanism. We analize all these lepton flavor violating decays in terms
of the relevant input parameters, which are the usual mSUGRA parameters and the
seesaw parameters. In the numerical analysis compatibility with the most recent
experimental upper bounds on all these $\tau$ and $\mu$ decays, with the
neutrino data, and with the present lower bounds on the supersymmetric particle
masses are required. Two typical scenarios with degenerate and hierarchical
heavy neutrinos are considered. We will show here that the minimal supergravity
and seesaw parameters do get important restrictions from these $\tau$ and $\mu$
decays in the hierarchical neutrino case.


title: Radial Flow in a Final State Interaction Model

abstract:
  In the framework of a final state interaction model, we show that the
so-called radial flow, i.e. the almost linear increase of the inverse slope $T$
with the mass of the produced particle, is already contained in the initial
condition -- with a slope $<u_t^2>$ (the so-called strength of the average
radial transverse flow) which is larger than the measured one. While the
precise value of the slope depends on the details of the model, the above
result has a very general basis -- namely the increase with increasing $p_T$ of
the fixed $p_T$ suppression, in the low $p_T$ region.


title:
Gapless formation in the $K^0$ condensed color-flavor locked quark
  matter : a model-independent treatment

abstract:
  The electric/color neutral solution and the critical conditions for gapless
formation are investigated in the $K^0$ condensed color-flavor locked matter.
We point out that there exist no longer gapless modes for down-strange quark
pairing while the gapless phenomenon for up-strange one is dominated in the
$K^0$ condensed environment. In a model-independent way, the phase transition
to the resulting gapless phase is found to be of first-order. The novel phase
structure implies that the chromomagnetic instability happens in the
previous-predicted gapless phase might be removed at least partly.


title:
Lepton Flavour Violation from SUSY--GUTs: Where do we stand for MEG,
  PRISM/PRIME and a Super Flavour factory

abstract:
  We analyse the complementarity between Lepton Flavour Violation (LFV) and LHC
experiments in probing the Supersymmetric (SUSY) Grand Unified Theories (GUT)
when neutrinos got a mass via the see--saw mechanism. Our analysis is performed
in an SO(10) framework, where at least one neutrino Yukawa coupling is
necessarily as large as the top Yukawa coupling. Our study thoroughly takes
into account the whole RG running, including the GUT and the right handed
neutrino mass scales, as well as the running of the observable neutrino
spectrum. We find that the upcoming (MEG, SuperKEKB) and future (PRISM/PRIME,
Super Flavour factory) LFV experiments will be able to test such SUSY framework
for SUSY masses to be explored at the LHC and, in some cases, even beyond the
LHC sensitivity reach.


title:
Production of doubly charged vector bilepton pairs at $\gamma \gamma$
  colliders

abstract:
  The production of pairs of doubly charged vector bileptons is studied at
future $\gamma \gamma$ colliders. The unpolarized cross--section for the
$\gamma \gamma \to Y^{--}Y^{++}$ subprocess is analytically calculated and
convoluted to predict the number of events in the complete $e^+e^-\to \gamma
\gamma \to Y^{--}Y^{++}$ process. The gauge or non--gauge character of the
vector bilepton $Y^{\pm \pm}$ is discussed. It is found that as a consequence
of its spectacular signature, as it decays dominantly into two identical
charged leptons, and also due to its charge contents, which significantly
enhance the cross--section, the detection of this class of particles with mass
in the sub--TeV region can be at the reach of these colliders. The
model--independent nature of our results is stressed.


title: Protected Baryon Number in Models with Majorana Neutrino

abstract:
  We obtain the condition to protect the baryon number in the $SU(2)_{L}$
triplet Higgs model. The obtained condition gives the upper limits for either
of the two kinds of the coupling constants which are newly introduced in
addition to ones in the standard model.


title:
Consistency of the Two Higgs Doublet Model and CP violation in top
  production at the LHC

abstract:
  It is important to provide guidance on whether CP violation may be measurable
in top-quark production at the Large Hadron Collider. The present work extends
an earlier analysis of the non-supersymmetric Two-Higgs-Doublet Model in this
respect, by allowing a more general potential. Also, a more comprehensive study
of theoretical and experimental constraints on the model is presented. Vacuum
stability, unitarity, direct searches and electroweak precision measurements
severely constrain the model. We explore, at low \tan\beta, the allowed regions
in the multidimensional parameter space that give a viable physical model. This
exploration is focused on the parameter space of the neutral sector rotation
matrix, which is closely related to the Yukawa couplings of interest. In most
of the remaining allowed regions, the model violates CP. We present a
quantitative discussion of a particular CP-violating observable. This would be
measurable in semileptonically decaying top and antitop quarks produced at the
LHC, provided the number of available events is of the order of a million.


title:
GARCON: Genetic Algorithm for Rectangular Cuts OptimizatioN. User's
  manual for version 2.0

abstract:
  This paper presents GARCON program, illustrating its functionality on a
simple HEP analysis example. The program automatically performs rectangular
cuts optimization and verification for stability in a multi-dimensional phase
space. The program has been successfully used by a number of very different
analyses presented in the CMS Physics Technical Design Report. The current
version GARCON 2.0 incorporates the feedback the authors have received. User's
Manual is included as a part of the note.


title: Neutrino See-Saw Triviality And Lepton Flavour Violation

abstract:
  For the D=5 Majorana neutrino mass operator to have a see-saw ultraviolet
completion that is viable up to the Planck scale, the see-saw scale is bounded
above due to triviality limits on the see-saw couplings. For supersymmetric
see-saw models, with realistic neutrino mass textures, we compare constraints
on the see-saw scale from triviality bounds, with those arising from
experimental limits on induced charged-lepton flavour violation, for both the
CMSSM and for models with split supersymmetry.


title: Grand Unification on Noncommutative Spacetime

abstract:
  We compute the beta-functions of the standard model formulated on a
noncommutative spacetime. If we assume that the scale for spacetime
noncommutativity is of the order of 2.2 \times 10^{15} GeV we find that the
three gauge couplings of the standard model merge at a scale of 2.3 \times
10^{17} GeV. The proton lifetime is thus much longer than in conventional
unification models.


title: Quantum fluctuations of space-time

abstract:
  Using a \emph{gedanken} experiment providing presumably a minimal inaccuracy
the uncertainty contributions to the space-time measurement are precisely
evaluated for clock and mirror respectively. The resulting expression of
minimal uncertainty for the space(time) interval indicates the presence of
minimal Planck scale observable length(time). The synthesis of quantum
mechanics and general relativity predicts the UV and IR scales for Lorentz
invariance violation. The influence of background radiation on the space-time
measurement is estimated. Based on the minimal length uncertainty relation
which takes into account the wavelength of a quantum used for distance
measurement we evaluate the cumulative factor responsible for the magnification
of the space-time fluctuation induced phase incoherence of a light propagating
over a large distance. We notice that in view of the interferometric
observations the quantum fluctuations of space-time in the braneworld model are
enormously increased if the fundamental scale is taken much below the Planck
one. Present approach to the uncertainty in distance measurement leads to new
insight about the bounds of computation. The impact of the space-time
fluctuations on the black hole physics is briefly emphasized.


title:
Dynamical breakdown of Abelian gauge chiral symmetry by strong Yukawa
  interactions

abstract:
  We consider a model with anomaly-free Abelian gauge axial-vector symmetry,
which is intended to mimic the standard electroweak gauge chiral SU(2)_L x
U(1)_Y theory. Within this model we demonstrate: (1) Strong Yukawa interactions
between massless fermion fields and a massive scalar field carrying the axial
charge generate dynamically the fermion and boson proper self-energies, which
are ultraviolet-finite and chirally noninvariant. (2) Solutions of the
underlying Schwinger-Dyson equations found numerically exhibit a huge
amplification of the fermion mass ratios as a response to mild changes of the
ratios of the Yukawa couplings. (3) The `would-be' Nambu-Goldstone boson is a
composite of both the fermion and scalar fields, and it gives rise to the mass
of the axial-vector gauge boson. (4) Spontaneous breakdown of the gauge
symmetry further manifests by mass splitting of the complex scalar and by new
symmetry-breaking vertices, generated at one loop. In particular, we work out
in detail the cubic vertex of the Abelian gauge boson.


title:
Limiting fragmentation in heavy-ion collisions and percolation of
  strings

abstract:
  The observed limiting fragmentation of charged particle distributions in
heavy ion collisions is difficult to explain as it does not apply to the proton
spectrum itself. On the other hand, string percolation provides a mechanism to
regenerate fast particles, eventually compensating the rapidity shift (energy
loss) of the nucleons. However a delicate energy-momentum compensation is
required, and in our framework we see no reason for limiting fragmentation to
be exact. A prediction, based on percolation arguments, is given for the
charged particle density in the full rapidity interval at LHC energy $(\sqrt s
=5500 GeV)$.


title: Effective 1.0: An Analytic Effective Action Analysis Library

abstract:
  Effective is a C++ library which provides the user a toolbox to study the
effective action of an arbitrary field theory. From the field content, gauge
groups and representations an appropriate action is generated symbolically. The
effective potential, mass spectrum, field couplings and vacuum expectation
values are then obtained automatically; tree level results are obtained
analytically while many tools, both numeric and analytic, provide a variety of
approaches to deal with the one-loop corrections. This article provides a guide
for users to who wish to analyze their own models using Effective. This is done
by presenting the code required and describing the physics assumptions behind
the code. The library can be extended in many ways and discussion of several
such extensions is also provided.


title: The Running Spectral Index as a Probe of Physics at High Energies

abstract:
  The WMAP results on the scalar spectral index n and its running with scale,
though preliminary, open a very interesting window to physics at very high
energies. We address the problem of finding simple inflaton potentials well
motivated by particle physics which can accommodate WMAP data.


title:
Charged Lepton Decays L_i to L_j + gamma, Leptogenesis CP-Violating
  Parameters and Majorana Phases

abstract:
  We analyse the dependence of the rates of the LFV charged lepton decays mu to
e + gamma, tau to e + gamma, tau to mu + gamma (l_i to l_j + gamma) and their
ratios, predicted in the class of SUSY theories with see-saw mechanism of
nu-mass generation and soft SUSY breaking with universal boundary conditions at
the GUT scale, on the Majorana CP-violation phases in the PMNS neutrino mixing
matrix and the ``leptogenesis'' CP-violating (CPV) parameters. The case of
quasi-degenerate in mass heavy Majorana neutrinos is considered. The analysis
is performed for normal hierarchical (NH), inverted hierarchical (IH) and
quasi-degenerate (QD) light neutrino mass spectra. We show, in particular, that
for NH and IH nu-mass spectrum and negligible lightest neutrino mass, all three
l_i to l_j + gamma decay branching ratios, BR(l_i to l_j + gamma), depend on
one Majorana phase, one leptogenesis CPV parameter and on the 3-neutrino
oscillation parameters; if the CHOOZ mixing angle theta_13 is sufficiently
large, they depend on the Dirac CPV phase in the PMNS matrix. The ``double
ratios'' R(21/31) sim BR(mu to e + gamma)/BR(tau to e + gamma) and R(21/32) sim
BR(mu to e + gamma)/BR(tau to mu + gamma) are determined by these parameters.
The same Majorana phase enters into the NH and IH expressions for the effective
Majorana mass in neutrinoless double beta decay, <m>.


title: The XYZ's of c\bar{c}: Hints of Exotic New Mesons

abstract:
  I discuss the nature of the new charm and charmonium like states observed in
the last few years and measurements that can test these assignments. In
particular it appears that the X(3943) is the eta_c''(3^1S_0) which can be
tested by looking for it in gamma gamma to D\bar{D}^*, the Y(3943) is the
chi_{c1}'(2^3P_1) which can be tested by looking for it in D\bar{D} and
D\bar{D}^*, the Z(3930) is the chi_{c2}'(2^3P_2) which can be confirmed by
looking for it in D\bar{D}^*. If the X(3872) is confirmed to have J^{PC}=1^{++}
it is almost certainly a multiquark state while if its J^{PC} is found to be
2^{-+} is is likely the 1^1D_2 state. The Y(4260) appears to be an extra 1^{--}
which is most easily explained as a charmonium hybrid. This can be tested by
looking the DD_1 final state.


title: CP violation conditions in N-Higgs-doublet potentials

abstract:
  Conditions for CP violation in the scalar potential sector of general
N-Higgs-doublet models (NHDMs) are analyzed from a group theoretical
perspective. For the simplest two-Higgs-doublet model (2HDM) potential, a
minimum set of conditions for explicit and spontaneous CP violation is
presented. The conditions can be given a clear geometrical interpretation in
terms of quantities in the adjoint representation of the basis transformation
group for the two doublets. Such conditions depend on CP-odd pseudoscalar
invariants. When the potential is CP invariant, the explicit procedure to reach
the real CP-basis and the explicit CP transformation can also be obtained. The
procedure to find the real basis and the conditions for CP violation are then
extended to general NHDM potentials. The analysis becomes more involved and
only a formal procedure to reach the real basis is found. Necessary conditions
for CP invariance can still be formulated in terms of group invariants: the
CP-odd generalized pseudoscalars. The problem can be completely solved for
three Higgs-doublets.


title: DGLAP improved saturation model with heavy flavours

abstract:
  The DGLAP improved saturation model of Bartels, Golec and Kowalski is
supplemented by the contribution from the heavy quarks: charm and beauty. It is
shown to give good description of both the total proton structure function F2
and, as a prediction, the heavy quarks contribution F2c and F2b. The reasonable
agreement for the longitudinal and diffractive structure functions is also
found.


title:
Implementing Canonical Seesaw Mechanism in a 3-3-1 Gauge Model without
  Exotic Electric Charges

abstract:
  We prove that - even at a low TeV scale - the canonical seesaw mechanism can
be naturally implemented in the exact solution of a particular 3-3-1 gauge
model, since a very small alteration $\epsilon$ in the parameter matrix of the
Higgs sector is taken into account. Therefore, this new parameter can act as an
appropriate mass source for neutrinos, while - due to the main parameter $a$ -
all the previously achieved results in the exact solution of the model are
recovered. Moreover, this mathematical artifice does separate the boson mass
spectrum from the neutrino mass issue, hence giving more flexibility in tuning
the model. Possible phenomenological results and their implications - such as
dark matter plausible candidates that can occur - are also briefly discussed.


title: Improved Bounds on Universal Extra Dimensions

abstract:
  We report on recent constraints on models with a flat ``universal'' extra
dimension in which all Standard Model fields propagate in the bulk. A
significantly improved constraint on the compactification scale is obtained
from the extended set of electroweak precision observables accurately measured
at LEP1 and LEP2. We find a lower bound of 1/R > 700 (800) GeV at the 99% (95%)
confidence level. Comparison of this constraint with the relic density of
Kaluza-Klein dark matter for the Minimal UED model points towards the necessity
of including non-minimal boundary terms which motivates studying alternative
Kaluza-Klein dark matter candidates. Results for the one-loop induced magnetic
dipole moment for Kaluza-Klein neutrino dark matter are presented.
  This talk is based on Phys.Rev.D73:095002,2006 and hep-ph/0601161.


title: Unusual Features of Drell-Yan Diffraction

abstract:
  The cross section of the diffractive Drell-Yan (DY) process, pp->(l-lbar X)p,
where the system (l-lbar X) is separated by a large rapidity gap from the
recoil proton, is calculated in the light-cone dipole approach. This process
reveals unusual features, quite different from what is known for diffractive
DIS and nonabelian radiation: (i) the diffractive radiation of a heavy dilepton
by a quark vanishes in the forward direction; (ii) the diffractive production
of a dilepton is controlled by the large hadronic radius; (iii) in contrast
with DIS where diffraction is predominantly soft, the diffractive DY reaction
is semihard-semisoft; (iv) as a result of the saturated shape of the dipole
cross section, the fraction of diffractive DY events steeply falls with energy,
but rises as function of the hard scale. These features are common for other
abelian bremsstrahlung processes (higgsstrahlung, Z-strahlung, etc.).
Measurements of diffractive DY processes at modern colliders would be a
sensitive probe for the shape of the dipole cross section at large separations.


title:
Inclusive pentaquark and strange baryons production in pp and \Sigma p
  collisions at high energy

abstract:
  We calculate the cross sections for the inclusive production in the
fragmentation region of $\Theta^+(1540)$ and $\Lambda(1520)$ in $pp$ collisions
and $\Lambda(1520)$ in $\Sigma p$ collisions at high energy using the $K$- and
$\pi$-meson exchange diagrams, respectively. The contributions of these
diagrams survive at asymptotically large energies and are energy independent in
this region up to logarithmic and power corrections. We find that inclusive
$\Theta^+(1540)$ production should be at the level of 1
$\mu\mathrm{b}\times\Gamma_{\Theta KN}/ 1$ MeV. The ratio of the
$\Theta^+(1540)$ over the $\Lambda(1520)$ yields is found to be $\sim 1%$. The
fraction of $\Lambda(1520)$ yields in $\Sigma p$ and $pp$ collisions is $\sim
2.7$ that quantitatively agrees with the preliminary result of the Fermilab
fixed target experiment E781.


title: Asymmetric Sneutrino Dark Matter

abstract:
  It is known that the cosmological baryon density (Omega(b)) and dark matter
density (Omega(dm)) have strikingly similar values. However, in most theories
of the early Universe, each density is explained by separate dynamics and
consequently there is no compelling reason for this observation. In this note,
I briefly review a model in which the dark matter possesses a
particle-antiparticle asymmetry. This asymmetry determines both the baryon
asymmetry and strongly affects the dark matter density, thus naturally linking
Omega(b) and Omega(dm). In these models it is shown that sneutrinos can play
the role of such dark matter.


title:
Elastic and large t rapidity gap vector meson production in
  ultraperipheral proton-ion collisions

abstract:
  We evaluate the cross sections for the production of vector mesons in
exclusive ultraperipheral proton-ion collisions at LHC. We find that the rates
are high enough to study the energy and momentum transfer dependence of vector
mesons - rho,phi, J/psi, Upsilon photoproduction in gamma p scattering in a
wide energy range extending the measurements which were performed at HERA,
providing new information about interplay of soft and hard physics in
diffraction. Also, we calculate the contributions to the vector meson yield due
to production of vector mesons off nuclear target by photons emitted by proton.
We find, that least in the case of Upsilon production it is feasible to observe
simultaneously both these processes. Such measurements would increase the
precision with which the A-dependence of exclusive onium production can be
determined. This would also enable one to estimate the amount of nuclear gluon
shadowing of generalized gluon distributions at much smaller x than that is
possible in AA collisions and to measure the cross sections for photoproduction
processes in a significantly wider energy range than that achieved in
experiments with fixed nuclear targets. We also present the cross section for
vector meson production in pA collisions at RHIC. In addition, we consider
production of vector mesons off protons with large rapidity gaps and large t.
These processes probe small x dynamics of the elastic interaction of small
dipoles at high energies and large but finite t, that is in the kinematics
where DGLAP evolution is strongly suppressed. We estimate that this process
could be studied at LHC up to W ~1 TeV with detectors which will be available
at LHC.


title: Are Preons Dyons? Naturalness of Three Generations

abstract:
  In the present paper a model of preons and their composites is constructed in
the framework of the superstring-inspired `flipped' E_6\times \widetilde{E_6}
gauge symmetry group which reveals a generalized dual symmetry. Here E_6 and
\widetilde{E_6} are non-dual and dual sectors of the theory with hyper-electric
g and hyper-magnetic \tilde g charges, respectively. We follow the old idea by
J. Pati presuming that preons are dyons, which in our model are confined by
hyper-magnetic strings -- composite {\bf N}=1 supersymmetric non-Abelian flux
tubes created by the condensation of spreons near the Planck scale. Considering
preons belonging to the 27-plet of E_6, we have investigated the breakdown of
E_6 (and \widetilde{E_6}) near the Planck scale into the SU(6)\times U(1) (and
\widetilde{SU(6)}\times \widetilde{U(1)}) gauge group and shown that the six
types of strings having fluxes \Phi_n=n\Phi_0 (n=\pm 1,\pm 2,\pm 3) produce
three (and only three) generations of composite quark-leptons and bosons. The
model predicts the existence of the Family replicated gauge group [E_6]^3 near
the Planck scale. The runnings of the corresponding fine structure constants
are investigated, and the critical coupling constants at the two phase
transition points near the Planck scale are calculated. The model explains the
hierarchies of masses in the Standard Model naturally. The compactification in
a space-time with five dimensions and its influence on form-factors of
composite objects are also briefly discussed.


title: Four Taus at the Tevatron

abstract:
  We study extensions of the Standard Model where the Higgs boson dominantly
decays via a cascade to four tau leptons, and discuss whether this decay is
visible at the Tevatron. We find that with an integrated luminosity of 6 fb^-1,
there can be excesses in multi-lepton events in several channels for a Higgs
boson of a mass = 110 GeV.


title: Running neutrino masses and mixing in a SU(4) x SU(2)^2 x U(1)_X model

abstract:
  In this talk, we discuss the implications of the renormalization group
equations for the neutrino masses and mixing angles in a supersymmetric
string-inspired SU(4) x SU(2)_L x SU(2)_R x U(1)_X model with matter in
fundamental and antisymmetric tensor representations only. The quark, charged
lepton and neutrino Yukawa matrices are distinguished by different
Clebsch-Gordan coefficients due to contracting over SU(4) and SU(2)_R indices.
In order to permit for a more realistic, hierarchical light neutrino mass
spectrum with bi-large mixing a second U(1)_X breaking singlet with fractional
charge is introduced. By numerical investigation we find a region in the model
parameter space where the neutrino mass-squared differences and mixing angles
at low energy are consistent with experimental data.


title: Eluding the BBN constraints on the stable gravitino

abstract:
  We investigate how late-time entropy production weakens the Big-Bang
Nucleosynthesis (BBN) constraints on the gravitino as lightest superparticle
with a charged slepton as next-to-lightest superparticle. We find that with a
moderate amount of entropy production, the BBN constraints can be eluded for
most of the parameter space relevant for the discovery of the gravitino. This
is encouraging for experimental tests of supergravity at LHC and ILC.


title: Tracking down penguins at the poles

abstract:
  QCD penguins are responsible for about 2/3 of the Delta I=1/2 rule in K to pi
pi decays, as inferred from a combined analysis of K to pi pi and KL to gamma
gamma. Further tests based on the decays KS to pi0 gamma gamma and K+ to pi+
gamma gamma are proposed. New insights into the treatment of pi0, eta, eta'
pole amplitudes are also reported.


title: Spectral action and big desert

abstract:
  The values of the Higgs mass are obtained for two possibilities of extending
the standard model in a way compatible with the existence of a noncommutative
structure at high energies. We assume the existence of a big desert between the
low energy electroweak scale and the high energy scale $\Lambda = 1.1\times
10^{17}$ GeV, where noncommutative features become relevant. We conclude that
it is extremely difficult to depart from the Higgs mass value $ m_H=
175.1^{+5.8}_{-9.8}$ GeV obtained from noncommutative geometry for the standard
model with three generations only.


title:
Given Talk at Moriond 2006: Fermion Mass in E6 GUT with Discrete Family
  Permutation Symmetry S3

abstract:
  A discrete symmetry S3 easily explains all neutrino data. However it is not
obvious the embedding of S3 in GUT where all fermions live in the same
representation. We show that embedding S3 in E6 it is possible to make
distinction between neutrinos and the rest of matter fermions.


title:
The Challenge of Determining SUSY Parameters in Focus-Point-Inspired
  Cases

abstract:
  We discuss the potential of combined LHC and ILC experiments for SUSY
searches in a difficult region of the parameter space, in which all sfermion
masses are above the TeV scale. Precision analyses of cross sections of light
chargino production and forward--backward asymmetries of decay leptons and
hadrons at the ILC, together with mass information on \tilde{\chi}^0_2 and
squarks from the LHC, allow us to fit rather precisely the underlying
fundamental gaugino/higgsino MSSM parameters and to constrain the masses of the
heavy virtual sparticles. For such analyses the complete spin correlations
between the production and decay processes have to be taken into account. We
also took into account expected experimental uncertainties.


title: Photoproduction of Xi off nucleons

abstract:
  The photoproduction reaction $\gamma N \to K K \Xi$ is investigated based on
a relativistic meson-exchange model of hadronic interactions. The production
amplitude is calculated in the tree-level approximation from relevant effective
Lagrangians, whose (coupling constant) parameters are mostly fixed from the
empirical data and/or quark models together with SU(3) symmetry considerations.
Gauge invariance of the resulting amplitude is maintained by introducing the
contact currents by extending the gauge-invariant approach of Haberzettl for
one-meson photoproduction to two-meson photoproduction. The role of the
intermediate low-lying hyperons and of the intermediate higher-mass hyperon
resonances are analyzed in detail. In particular, the basic features of the
production of $\Xi^-(1318)$ in $\gamma p \to K^+ K^+ \Xi^-$ and their possible
manifestations in the forthcoming experimental data are discussed.


title: Theoretical Status of K->pinunubar Decays

abstract:
  We present a concise review of the theoretical status of rare K->pinunubar
decays in and beyond the standard model. Particular attention is thereby
devoted to the recent calculation of the next-to-next-to-leading order
corrections to the charm quark contribution of K^+->pi^+nunubar which removes
the last relevant theoretical uncertainty from the K->pinunubar system.


title:
Squarks and Sleptons between Branes and Bulk - Gaugino Mediation and
  Gravitino Dark Matter in an SO(10) Orbifold GUT

abstract:
  We study gaugino-mediated supersymmetry breaking in a six-dimensional SO(10)
orbifold GUT model where quarks and leptons are mixtures of brane and bulk
fields. The couplings of bulk matter fields to the supersymmetry breaking brane
field have to be suppressed in order to avoid large FCNCs. We derive bounds on
the soft supersymmetry breaking parameters and calculate the superparticle mass
spectrum. If the gravitino is the LSP, the stau_1 or the tau sneutrino turns
out to be the NLSP, with characteristic signatures at future colliders and in
cosmology.


title: Neutrino Majorana

abstract:
  The Majorana paper ``Symmetrical theory of the electron and positron'' is
briefly reviewed. The present status of Majorana neutrinos is discussed.


title: Infrared Properties of QCD from Dyson-Schwinger equations

abstract:
  I review recent results on the infrared properties of QCD from
Dyson-Schwinger equations. The topics include infrared exponents of
one-particle irreducible Green's functions, the fixed point behaviour of the
running coupling at zero momentum, the pattern of dynamical quark mass
generation and properties of light mesons.


title: Forward gluon production in hadron-hadron scattering with Pomeron loops

abstract:
  We discuss new physical phenomena expected in particle production in
hadron-hadron collisions at high energy, as a consequence of Pomeron loop
effects in the evolution equations for the Color Glass Condensate. We focus on
gluon production in asymmetric, `dilute-dense', collisions : a dilute
projectile scatters off a dense hadronic target, whose gluon distribution is
highly evolved. This situation is representative for particle production in
proton-proton collisions at forward rapidities (say, at LHC) and admits a
dipole factorization similar to that of deep inelastic scattering (DIS). We
show that at sufficiently large forward rapidities, where the Pomeron loop
effects become important in the evolution of the target wavefunction, gluon
production is dominated by `black spots' (saturated gluon configurations) up to
very large values of the transverse momentum, well above the average saturation
momentum in the target. In this regime, the produced gluon spectrum exhibits
diffusive scaling, so like DIS at sufficiently high energy.


title: Semi-numerical evaluation of one-loop corrections

abstract:
  We present a semi-numerical method to compute one-loop corrections to
multi-leg processes. We apply the method to the study of Higgs plus four parton
and six gluon amplitudes.


title: Inclusive hadronic distributions at small x

abstract:
  After giving their general expressions valid at all x, double differential
1-particle inclusive distribution inside a quark and a gluon jet produced in a
hard process, together with the inclusive kt distribution, are given at small x
in the Modified Leading Logarithmic Approximation (MLLA), as functions of the
transverse momentum kt of the outgoing hadron.


title: Analysis of enhanced tan(beta) corrections in MFV GUT scenarios

abstract:
  We analyse a minimal supersymmetric standard model (MSSM) taking a minimal
flavour violation (MFV) structure at the GUT scale. We evaluate the parameters
at the electroweak scale taking into account the full flavour structure in the
evolution of the renormalization group equations. We concentrate mainly on the
decay Bs -> mu mu and its correlations with other observables like b -> s
gamma, b -> s l l, Delta M_Bs and the anomalous magnetic moment of the muon. We
restrict our analysis to the regions in parameter space consistent with the
dark matter constraints. We find that the BR(Bs -> mu mu) can exceed the
current experimental limit in the regions of parameter space which are allowed
by all other constraints thus providing an additional bound on supersymmetric
parameters. This holds even in the constrained MSSM. Assuming an hypothetical
measurement of BR(Bs -> mu mu) ~ 10^-7 we analyse the predicted MSSM spectrum
and flavour violating decay modes of supersymmetric particles which are found
to be small.


title: Calculating the Jet Quenching Parameter from AdS/CFT

abstract:
  Models of medium-induced radiative parton energy loss account for the strong
suppression of high-pT hadron spectra in $\sqrt{s_{NN}}=200$ GeV Au-Au
collisions at RHIC in terms of a single "jet quenching parameter'' $\hat q$.
The available suite of jet quenching measurements make $\hat q$ one of the
experimentally best constrained properties of the hot fluid produced in RHIC
collisions. We observe that $\hat q$ can be given a model-independent,
nonperturbative, quantum field theoretic definition in terms of the
short-distance behavior of a particular light-like Wilson loop. We then use the
AdS/CFT correspondence to obtain a strong-coupling calculation of $\hat q$ in
hot N=4 supersymmetric QCD, finding $\hat{q}_{SYM} = 26.69 \sqrt{\alpha_{SYM}
N_c} T^3$ in the limit in which both $N_c$ and $4\pi\alpha_{SYM} N_c$ are
large. We thus learn that at strong coupling $\hat q$ is not proportional to
the entropy density $s$, or to some "number density of scatterers'' since,
unlike the number of degrees of freedom, $\hat q$ does not grow like $N_c^2$.


title: Finite Temperature Corrections to Relic Density Calculations

abstract:
  In this paper we evaluate finite temperature corrections to the dark matter
relic density within the context of minimal supersymmetry with a neutralino
LSP. We identify several regions of parameter space where the WIMP annihilation
cross section is especially sensitive to small corrections to the undelrlying
parameters. In these regions, finite temperature effects have the potential to
be important. However, we shall show by explicit calculation that these effects
are small. In the regions we investigated, the maximal corrections are on the
order of 10^{-4} and are therefore negligible compared with theoretical and
experimental uncertainties.


title: Common Origin of Neutrino Mass, Dark Matter, and Baryogenesis

abstract:
  Combining one established idea with two recent ones, it is pointed out for
the first time that three of the outstanding problems of particle physics and
cosmology, i.e. neutrino mass, dark matter, and baryogenesis, may have a common
solution, arising from the interactions of a single term, with experimentally
verifiable consequences.


title:
QCD Correction to Neutralino Annihilation Process and Dark Matter
  Density in Supersymmetric Models

abstract:
  We calculate QCD correction to the neutralino annihilation cross section into
quark anti-quark final state and discuss its implications to the calculation of
neutralino relic density. We see that the QCD correction enhances the
pair-annihilation cross section by O(10 %) when final-state quarks are
non-relativistic. Consequently, when the lightest neutralinos dominantly
annihilate into a t\bar{t} pair, the relic density of the lightest neutralino
is significantly affected by the QCD correction, in particular when the
lightest-neutralino mass is close to the top-quark mass.


title:
B_s - \bar{B}_s mixing in the MSSM scenario with large flavor mixing in
  the LL/RR sector

abstract:
  We show that the recent measurements of $B_s-\bar{B}_s$ mass difference,
$\Delta m_s$, by D{\O} and CDF collaborations give very strong constraints on
MSSM scenario with large flavor mixing in the LL and/or RR sector of down-type
squark mass squared matrix. In particular, the region with large mixing angle
and large mass difference between scalar strange and scalar bottom is ruled out
by giving too large $\Delta m_s$. The allowed region is sensitive to the CP
violating phases $\delta_{L(R)}$. The $\Delta m_s$ constraint is most stringent
on the scenario with both LL and RR mixing. We also predict the time-dependent
CP asymmetry in $B_s \to \psi \phi$ decay and semileptonic asymmetry in $B_s\to
\ell X$ decay.


title:
Deciphering the properties of the medium produced in heavy ion
  collisions at RHIC by a pQCD analysis of quenched large $p_{\perp}$ $\pi^0$
  spectra

abstract:
  We discuss the question of the relevance of perturbative QCD calculations for
analyzing the properties of the dense medium produced in heavy ion collisions.
Up to now leading order perturbative estimates have been worked out and
confronted with data for quenched large $p_{\perp}$ hadron spectra. Some of
them are giving paradoxical results, contradicting the perturbative framework
and leading to speculations such as the formation of a strongly interacting
quark-gluon plasma. Trying to bypass some drawbacks of these leading order
analysis and without performing detailed numerical investigations, we collect
evidence in favour of a consistent description of quenching and of the
characteristics of the produced medium within the pQCD framework.


title: Stability and Symmetry Breaking in the General Two-Higgs-Doublet Model

abstract:
  A method is presented for the analysis of the scalar potential in the general
Two-Higgs-Doublet Model. This allows us to give the conditions for the
stability of the potential and for electroweak symmetry breaking in this model
in a very concise way. These results are then applied to two different Higgs
potentials in the literature, namely the MSSM and the Two-Higgs-Doublet
potential proposed by Gunion at al. All known results for these models follow
easily as special cases from the general results. In particular, in the
potential of Gunion et al. we can clarify some interesting aspects of the model
with the help of the proposed method.


title:
Solving effective field theory of interacting QCD pomerons in the
  semi-classical approximation

abstract:
  Effective field theory of BFKL pomerons interacting by QCD triple pomeron
vertices is investigated. Classical equations of motion for the effective
pomeron fields are presented being a minimal extension of the
Balitsky-Kovchegov equation that incorporates both merging and splitting of the
pomerons and that is self-dual. The equations are solved for symmetric boundary
conditions. The solutions provide the dominant contribution to the scattering
amplitudes in the semi-classical approximation. We find that for rapidities of
the scattering larger than a critical value Y_c at least two classical
solutions exist. Curiously, for each of the two classical solutions with the
lowest action the symmetry between the projectile and the target is found to be
spontaneously broken, being however preserved for the complete set of classical
solutions. The solving configurations at rapidities Y>Y_c consist of a Gribov
field being strongly suppressed even at very large gluon momenta and the
complementary Gribov field that converges at high Y to a solution of
Balitsky-Kovchegov equation. Interpretation of the results is given and
possible consequences are shortly discussed.


title: Solar Neutrinos (with a tribute to John. N. Bahcall)

abstract:
  John N. Bahcall championed solar neutrino physics for many years. Thanks to
his pioneering and long-lasting contributions, this field of research has not
only reached maturity, but has also opened a new window on physics beyond the
standard electroweak model through the phenomenon of neutrino flavor
oscillations. We briefly outline some recent accomplishments in the field, and
also discuss a couple of issues that do not seem to fit in the ``standard
picture,'' namely, the chemical controversy at the solar surface, and possible
implications of recent gallium radioactive source experiments.


title:
D-brane Standard Model variants and Split Supersymmetry: Unification and
  fermion mass predictions

abstract:
  We study D-brane inspired models with U(3) x U(2) x U(1)^N gauge symmetry in
the context of split supersymmetry. We consider configurations with one, two
and three (N=1,2,3) abelian branes and derive all hypercharge embeddings which
imply a realistic particle content. Then, we analyze the implications of split
supersymmetry on the magnitude of the string scale, the gauge coupling
evolution, the third family fermion mass relations and the gaugino masses. We
consider gauge coupling relations which may arise in parallel as well as
intersecting brane scenarios and classify the various models according to their
predictions for the magnitude of the string scale and the low energy
implications. In the parallel brane scenario where the U(1) branes are
superposed to U(2) or U(3) brane stacks, varying the split susy scale in a wide
range, we find three distinct cases of models predicting a high, intermediate
and low string scale, M_S ~ 10^{16} GeV, M_S ~ 10^7 GeV and M_S ~ 10^4 GeV
respectively. We further find that in the intermediate string scale model the
low energy ratio m_b / m_\tau is compatible with b-\tau Yukawa unification at
the string scale. Furthermore, we perform a similar analysis for arbitrary
abelian gauge coupling relations at M_S corresponding to possible intersecting
brane models. We find cases which predict a string scale of the order M_S \ge
10^{14} GeV that accommodate a right-handed neutrino mass of the same order so
that a see-saw type light left-handed neutrino component is obtained in the
sub-eV range as required by experimental and cosmological data. Finally, a
short discussion is devoted for the gaugino masses and the life-time of the
gluino.


title: Higgs-field Portal into Hidden Sectors

abstract:
  The Higgs field mass term, being superrenomalizable, has a unique status
within the standard model. Through the opening it affords, $SU(3) \times SU(2)
\times U(1)$ singlet fields can have renormalizable couplings to standard model
fields. We present examples that are neither grotesque nor unnatural. A
possible consequence is to spread the Higgs particle resonance into several
weaker ones, or to afford it additional, effectively invisible decay channels.


title: Diffractive Higgs production at the LHC

abstract:
  We review recent issues concerning exclusive Higgs production at the LHC, and
related processes at the Tevatron and HERA.